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a723baf1 | 1 | /* C++ Parser. |
3beb3abf | 2 | Copyright (C) 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
a723baf1 MM |
3 | Written by Mark Mitchell <mark@codesourcery.com>. |
4 | ||
f5adbb8d | 5 | This file is part of GCC. |
a723baf1 | 6 | |
f5adbb8d | 7 | GCC is free software; you can redistribute it and/or modify it |
a723baf1 MM |
8 | under the terms of the GNU General Public License as published by |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
f5adbb8d | 12 | GCC is distributed in the hope that it will be useful, but |
a723baf1 MM |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
f5adbb8d | 18 | along with GCC; see the file COPYING. If not, write to the Free |
a723baf1 MM |
19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
20 | 02111-1307, USA. */ | |
21 | ||
22 | #include "config.h" | |
23 | #include "system.h" | |
24 | #include "coretypes.h" | |
25 | #include "tm.h" | |
26 | #include "dyn-string.h" | |
27 | #include "varray.h" | |
28 | #include "cpplib.h" | |
29 | #include "tree.h" | |
30 | #include "cp-tree.h" | |
31 | #include "c-pragma.h" | |
32 | #include "decl.h" | |
33 | #include "flags.h" | |
34 | #include "diagnostic.h" | |
a723baf1 MM |
35 | #include "toplev.h" |
36 | #include "output.h" | |
37 | ||
38 | \f | |
39 | /* The lexer. */ | |
40 | ||
41 | /* Overview | |
42 | -------- | |
43 | ||
44 | A cp_lexer represents a stream of cp_tokens. It allows arbitrary | |
45 | look-ahead. | |
46 | ||
47 | Methodology | |
48 | ----------- | |
49 | ||
50 | We use a circular buffer to store incoming tokens. | |
51 | ||
52 | Some artifacts of the C++ language (such as the | |
53 | expression/declaration ambiguity) require arbitrary look-ahead. | |
54 | The strategy we adopt for dealing with these problems is to attempt | |
55 | to parse one construct (e.g., the declaration) and fall back to the | |
56 | other (e.g., the expression) if that attempt does not succeed. | |
57 | Therefore, we must sometimes store an arbitrary number of tokens. | |
58 | ||
59 | The parser routinely peeks at the next token, and then consumes it | |
60 | later. That also requires a buffer in which to store the tokens. | |
61 | ||
62 | In order to easily permit adding tokens to the end of the buffer, | |
63 | while removing them from the beginning of the buffer, we use a | |
64 | circular buffer. */ | |
65 | ||
66 | /* A C++ token. */ | |
67 | ||
68 | typedef struct cp_token GTY (()) | |
69 | { | |
70 | /* The kind of token. */ | |
71 | enum cpp_ttype type; | |
72 | /* The value associated with this token, if any. */ | |
73 | tree value; | |
74 | /* If this token is a keyword, this value indicates which keyword. | |
75 | Otherwise, this value is RID_MAX. */ | |
76 | enum rid keyword; | |
82a98427 NS |
77 | /* The location at which this token was found. */ |
78 | location_t location; | |
a723baf1 MM |
79 | } cp_token; |
80 | ||
81 | /* The number of tokens in a single token block. */ | |
82 | ||
83 | #define CP_TOKEN_BLOCK_NUM_TOKENS 32 | |
84 | ||
85 | /* A group of tokens. These groups are chained together to store | |
86 | large numbers of tokens. (For example, a token block is created | |
87 | when the body of an inline member function is first encountered; | |
88 | the tokens are processed later after the class definition is | |
89 | complete.) | |
90 | ||
91 | This somewhat ungainly data structure (as opposed to, say, a | |
34cd5ae7 | 92 | variable-length array), is used due to constraints imposed by the |
a723baf1 MM |
93 | current garbage-collection methodology. If it is made more |
94 | flexible, we could perhaps simplify the data structures involved. */ | |
95 | ||
96 | typedef struct cp_token_block GTY (()) | |
97 | { | |
98 | /* The tokens. */ | |
99 | cp_token tokens[CP_TOKEN_BLOCK_NUM_TOKENS]; | |
100 | /* The number of tokens in this block. */ | |
101 | size_t num_tokens; | |
102 | /* The next token block in the chain. */ | |
103 | struct cp_token_block *next; | |
104 | /* The previous block in the chain. */ | |
105 | struct cp_token_block *prev; | |
106 | } cp_token_block; | |
107 | ||
108 | typedef struct cp_token_cache GTY (()) | |
109 | { | |
110 | /* The first block in the cache. NULL if there are no tokens in the | |
111 | cache. */ | |
112 | cp_token_block *first; | |
113 | /* The last block in the cache. NULL If there are no tokens in the | |
114 | cache. */ | |
115 | cp_token_block *last; | |
116 | } cp_token_cache; | |
117 | ||
9bcb9aae | 118 | /* Prototypes. */ |
a723baf1 MM |
119 | |
120 | static cp_token_cache *cp_token_cache_new | |
121 | (void); | |
122 | static void cp_token_cache_push_token | |
123 | (cp_token_cache *, cp_token *); | |
124 | ||
125 | /* Create a new cp_token_cache. */ | |
126 | ||
127 | static cp_token_cache * | |
128 | cp_token_cache_new () | |
129 | { | |
130 | return (cp_token_cache *) ggc_alloc_cleared (sizeof (cp_token_cache)); | |
131 | } | |
132 | ||
133 | /* Add *TOKEN to *CACHE. */ | |
134 | ||
135 | static void | |
136 | cp_token_cache_push_token (cp_token_cache *cache, | |
137 | cp_token *token) | |
138 | { | |
139 | cp_token_block *b = cache->last; | |
140 | ||
141 | /* See if we need to allocate a new token block. */ | |
142 | if (!b || b->num_tokens == CP_TOKEN_BLOCK_NUM_TOKENS) | |
143 | { | |
144 | b = ((cp_token_block *) ggc_alloc_cleared (sizeof (cp_token_block))); | |
145 | b->prev = cache->last; | |
146 | if (cache->last) | |
147 | { | |
148 | cache->last->next = b; | |
149 | cache->last = b; | |
150 | } | |
151 | else | |
152 | cache->first = cache->last = b; | |
153 | } | |
154 | /* Add this token to the current token block. */ | |
155 | b->tokens[b->num_tokens++] = *token; | |
156 | } | |
157 | ||
158 | /* The cp_lexer structure represents the C++ lexer. It is responsible | |
159 | for managing the token stream from the preprocessor and supplying | |
160 | it to the parser. */ | |
161 | ||
162 | typedef struct cp_lexer GTY (()) | |
163 | { | |
164 | /* The memory allocated for the buffer. Never NULL. */ | |
165 | cp_token * GTY ((length ("(%h.buffer_end - %h.buffer)"))) buffer; | |
166 | /* A pointer just past the end of the memory allocated for the buffer. */ | |
167 | cp_token * GTY ((skip (""))) buffer_end; | |
168 | /* The first valid token in the buffer, or NULL if none. */ | |
169 | cp_token * GTY ((skip (""))) first_token; | |
170 | /* The next available token. If NEXT_TOKEN is NULL, then there are | |
171 | no more available tokens. */ | |
172 | cp_token * GTY ((skip (""))) next_token; | |
173 | /* A pointer just past the last available token. If FIRST_TOKEN is | |
174 | NULL, however, there are no available tokens, and then this | |
175 | location is simply the place in which the next token read will be | |
176 | placed. If LAST_TOKEN == FIRST_TOKEN, then the buffer is full. | |
177 | When the LAST_TOKEN == BUFFER, then the last token is at the | |
178 | highest memory address in the BUFFER. */ | |
179 | cp_token * GTY ((skip (""))) last_token; | |
180 | ||
181 | /* A stack indicating positions at which cp_lexer_save_tokens was | |
182 | called. The top entry is the most recent position at which we | |
183 | began saving tokens. The entries are differences in token | |
184 | position between FIRST_TOKEN and the first saved token. | |
185 | ||
186 | If the stack is non-empty, we are saving tokens. When a token is | |
187 | consumed, the NEXT_TOKEN pointer will move, but the FIRST_TOKEN | |
188 | pointer will not. The token stream will be preserved so that it | |
189 | can be reexamined later. | |
190 | ||
191 | If the stack is empty, then we are not saving tokens. Whenever a | |
192 | token is consumed, the FIRST_TOKEN pointer will be moved, and the | |
193 | consumed token will be gone forever. */ | |
194 | varray_type saved_tokens; | |
195 | ||
196 | /* The STRING_CST tokens encountered while processing the current | |
197 | string literal. */ | |
198 | varray_type string_tokens; | |
199 | ||
200 | /* True if we should obtain more tokens from the preprocessor; false | |
201 | if we are processing a saved token cache. */ | |
202 | bool main_lexer_p; | |
203 | ||
204 | /* True if we should output debugging information. */ | |
205 | bool debugging_p; | |
206 | ||
207 | /* The next lexer in a linked list of lexers. */ | |
208 | struct cp_lexer *next; | |
209 | } cp_lexer; | |
210 | ||
211 | /* Prototypes. */ | |
212 | ||
17211ab5 | 213 | static cp_lexer *cp_lexer_new_main |
94edc4ab | 214 | (void); |
a723baf1 | 215 | static cp_lexer *cp_lexer_new_from_tokens |
94edc4ab | 216 | (struct cp_token_cache *); |
a723baf1 | 217 | static int cp_lexer_saving_tokens |
94edc4ab | 218 | (const cp_lexer *); |
a723baf1 | 219 | static cp_token *cp_lexer_next_token |
94edc4ab NN |
220 | (cp_lexer *, cp_token *); |
221 | static ptrdiff_t cp_lexer_token_difference | |
222 | (cp_lexer *, cp_token *, cp_token *); | |
a723baf1 | 223 | static cp_token *cp_lexer_read_token |
94edc4ab | 224 | (cp_lexer *); |
a723baf1 | 225 | static void cp_lexer_maybe_grow_buffer |
94edc4ab | 226 | (cp_lexer *); |
a723baf1 | 227 | static void cp_lexer_get_preprocessor_token |
94edc4ab | 228 | (cp_lexer *, cp_token *); |
a723baf1 | 229 | static cp_token *cp_lexer_peek_token |
94edc4ab | 230 | (cp_lexer *); |
a723baf1 | 231 | static cp_token *cp_lexer_peek_nth_token |
94edc4ab | 232 | (cp_lexer *, size_t); |
f7b5ecd9 | 233 | static inline bool cp_lexer_next_token_is |
94edc4ab | 234 | (cp_lexer *, enum cpp_ttype); |
a723baf1 | 235 | static bool cp_lexer_next_token_is_not |
94edc4ab | 236 | (cp_lexer *, enum cpp_ttype); |
a723baf1 | 237 | static bool cp_lexer_next_token_is_keyword |
94edc4ab NN |
238 | (cp_lexer *, enum rid); |
239 | static cp_token *cp_lexer_consume_token | |
240 | (cp_lexer *); | |
a723baf1 MM |
241 | static void cp_lexer_purge_token |
242 | (cp_lexer *); | |
243 | static void cp_lexer_purge_tokens_after | |
244 | (cp_lexer *, cp_token *); | |
245 | static void cp_lexer_save_tokens | |
94edc4ab | 246 | (cp_lexer *); |
a723baf1 | 247 | static void cp_lexer_commit_tokens |
94edc4ab | 248 | (cp_lexer *); |
a723baf1 | 249 | static void cp_lexer_rollback_tokens |
94edc4ab | 250 | (cp_lexer *); |
f7b5ecd9 | 251 | static inline void cp_lexer_set_source_position_from_token |
94edc4ab | 252 | (cp_lexer *, const cp_token *); |
a723baf1 | 253 | static void cp_lexer_print_token |
94edc4ab | 254 | (FILE *, cp_token *); |
f7b5ecd9 | 255 | static inline bool cp_lexer_debugging_p |
94edc4ab | 256 | (cp_lexer *); |
a723baf1 | 257 | static void cp_lexer_start_debugging |
94edc4ab | 258 | (cp_lexer *) ATTRIBUTE_UNUSED; |
a723baf1 | 259 | static void cp_lexer_stop_debugging |
94edc4ab | 260 | (cp_lexer *) ATTRIBUTE_UNUSED; |
a723baf1 MM |
261 | |
262 | /* Manifest constants. */ | |
263 | ||
264 | #define CP_TOKEN_BUFFER_SIZE 5 | |
265 | #define CP_SAVED_TOKENS_SIZE 5 | |
266 | ||
267 | /* A token type for keywords, as opposed to ordinary identifiers. */ | |
268 | #define CPP_KEYWORD ((enum cpp_ttype) (N_TTYPES + 1)) | |
269 | ||
270 | /* A token type for template-ids. If a template-id is processed while | |
271 | parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token; | |
272 | the value of the CPP_TEMPLATE_ID is whatever was returned by | |
273 | cp_parser_template_id. */ | |
274 | #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1)) | |
275 | ||
276 | /* A token type for nested-name-specifiers. If a | |
277 | nested-name-specifier is processed while parsing tentatively, it is | |
278 | replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the | |
279 | CPP_NESTED_NAME_SPECIFIER is whatever was returned by | |
280 | cp_parser_nested_name_specifier_opt. */ | |
281 | #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1)) | |
282 | ||
283 | /* A token type for tokens that are not tokens at all; these are used | |
284 | to mark the end of a token block. */ | |
285 | #define CPP_NONE (CPP_NESTED_NAME_SPECIFIER + 1) | |
286 | ||
287 | /* Variables. */ | |
288 | ||
289 | /* The stream to which debugging output should be written. */ | |
290 | static FILE *cp_lexer_debug_stream; | |
291 | ||
17211ab5 GK |
292 | /* Create a new main C++ lexer, the lexer that gets tokens from the |
293 | preprocessor. */ | |
a723baf1 MM |
294 | |
295 | static cp_lexer * | |
17211ab5 | 296 | cp_lexer_new_main (void) |
a723baf1 MM |
297 | { |
298 | cp_lexer *lexer; | |
17211ab5 GK |
299 | cp_token first_token; |
300 | ||
301 | /* It's possible that lexing the first token will load a PCH file, | |
302 | which is a GC collection point. So we have to grab the first | |
303 | token before allocating any memory. */ | |
304 | cp_lexer_get_preprocessor_token (NULL, &first_token); | |
305 | cpp_get_callbacks (parse_in)->valid_pch = NULL; | |
a723baf1 MM |
306 | |
307 | /* Allocate the memory. */ | |
308 | lexer = (cp_lexer *) ggc_alloc_cleared (sizeof (cp_lexer)); | |
309 | ||
310 | /* Create the circular buffer. */ | |
311 | lexer->buffer = ((cp_token *) | |
17211ab5 | 312 | ggc_calloc (CP_TOKEN_BUFFER_SIZE, sizeof (cp_token))); |
a723baf1 MM |
313 | lexer->buffer_end = lexer->buffer + CP_TOKEN_BUFFER_SIZE; |
314 | ||
17211ab5 GK |
315 | /* There is one token in the buffer. */ |
316 | lexer->last_token = lexer->buffer + 1; | |
317 | lexer->first_token = lexer->buffer; | |
318 | lexer->next_token = lexer->buffer; | |
319 | memcpy (lexer->buffer, &first_token, sizeof (cp_token)); | |
a723baf1 MM |
320 | |
321 | /* This lexer obtains more tokens by calling c_lex. */ | |
17211ab5 | 322 | lexer->main_lexer_p = true; |
a723baf1 MM |
323 | |
324 | /* Create the SAVED_TOKENS stack. */ | |
325 | VARRAY_INT_INIT (lexer->saved_tokens, CP_SAVED_TOKENS_SIZE, "saved_tokens"); | |
326 | ||
327 | /* Create the STRINGS array. */ | |
328 | VARRAY_TREE_INIT (lexer->string_tokens, 32, "strings"); | |
329 | ||
330 | /* Assume we are not debugging. */ | |
331 | lexer->debugging_p = false; | |
332 | ||
333 | return lexer; | |
334 | } | |
335 | ||
336 | /* Create a new lexer whose token stream is primed with the TOKENS. | |
337 | When these tokens are exhausted, no new tokens will be read. */ | |
338 | ||
339 | static cp_lexer * | |
340 | cp_lexer_new_from_tokens (cp_token_cache *tokens) | |
341 | { | |
342 | cp_lexer *lexer; | |
343 | cp_token *token; | |
344 | cp_token_block *block; | |
345 | ptrdiff_t num_tokens; | |
346 | ||
17211ab5 GK |
347 | /* Allocate the memory. */ |
348 | lexer = (cp_lexer *) ggc_alloc_cleared (sizeof (cp_lexer)); | |
a723baf1 MM |
349 | |
350 | /* Create a new buffer, appropriately sized. */ | |
351 | num_tokens = 0; | |
352 | for (block = tokens->first; block != NULL; block = block->next) | |
353 | num_tokens += block->num_tokens; | |
17211ab5 | 354 | lexer->buffer = ((cp_token *) ggc_alloc (num_tokens * sizeof (cp_token))); |
a723baf1 MM |
355 | lexer->buffer_end = lexer->buffer + num_tokens; |
356 | ||
357 | /* Install the tokens. */ | |
358 | token = lexer->buffer; | |
359 | for (block = tokens->first; block != NULL; block = block->next) | |
360 | { | |
361 | memcpy (token, block->tokens, block->num_tokens * sizeof (cp_token)); | |
362 | token += block->num_tokens; | |
363 | } | |
364 | ||
365 | /* The FIRST_TOKEN is the beginning of the buffer. */ | |
366 | lexer->first_token = lexer->buffer; | |
367 | /* The next available token is also at the beginning of the buffer. */ | |
368 | lexer->next_token = lexer->buffer; | |
369 | /* The buffer is full. */ | |
370 | lexer->last_token = lexer->first_token; | |
371 | ||
17211ab5 GK |
372 | /* This lexer doesn't obtain more tokens. */ |
373 | lexer->main_lexer_p = false; | |
374 | ||
375 | /* Create the SAVED_TOKENS stack. */ | |
376 | VARRAY_INT_INIT (lexer->saved_tokens, CP_SAVED_TOKENS_SIZE, "saved_tokens"); | |
377 | ||
378 | /* Create the STRINGS array. */ | |
379 | VARRAY_TREE_INIT (lexer->string_tokens, 32, "strings"); | |
380 | ||
381 | /* Assume we are not debugging. */ | |
382 | lexer->debugging_p = false; | |
383 | ||
a723baf1 MM |
384 | return lexer; |
385 | } | |
386 | ||
4de8668e | 387 | /* Returns nonzero if debugging information should be output. */ |
a723baf1 | 388 | |
f7b5ecd9 MM |
389 | static inline bool |
390 | cp_lexer_debugging_p (cp_lexer *lexer) | |
a723baf1 | 391 | { |
f7b5ecd9 MM |
392 | return lexer->debugging_p; |
393 | } | |
394 | ||
395 | /* Set the current source position from the information stored in | |
396 | TOKEN. */ | |
397 | ||
398 | static inline void | |
94edc4ab NN |
399 | cp_lexer_set_source_position_from_token (cp_lexer *lexer ATTRIBUTE_UNUSED , |
400 | const cp_token *token) | |
f7b5ecd9 MM |
401 | { |
402 | /* Ideally, the source position information would not be a global | |
403 | variable, but it is. */ | |
404 | ||
405 | /* Update the line number. */ | |
406 | if (token->type != CPP_EOF) | |
82a98427 | 407 | input_location = token->location; |
a723baf1 MM |
408 | } |
409 | ||
410 | /* TOKEN points into the circular token buffer. Return a pointer to | |
411 | the next token in the buffer. */ | |
412 | ||
f7b5ecd9 | 413 | static inline cp_token * |
94edc4ab | 414 | cp_lexer_next_token (cp_lexer* lexer, cp_token* token) |
a723baf1 MM |
415 | { |
416 | token++; | |
417 | if (token == lexer->buffer_end) | |
418 | token = lexer->buffer; | |
419 | return token; | |
420 | } | |
421 | ||
4de8668e | 422 | /* nonzero if we are presently saving tokens. */ |
f7b5ecd9 MM |
423 | |
424 | static int | |
94edc4ab | 425 | cp_lexer_saving_tokens (const cp_lexer* lexer) |
f7b5ecd9 MM |
426 | { |
427 | return VARRAY_ACTIVE_SIZE (lexer->saved_tokens) != 0; | |
428 | } | |
429 | ||
a723baf1 MM |
430 | /* Return a pointer to the token that is N tokens beyond TOKEN in the |
431 | buffer. */ | |
432 | ||
433 | static cp_token * | |
434 | cp_lexer_advance_token (cp_lexer *lexer, cp_token *token, ptrdiff_t n) | |
435 | { | |
436 | token += n; | |
437 | if (token >= lexer->buffer_end) | |
438 | token = lexer->buffer + (token - lexer->buffer_end); | |
439 | return token; | |
440 | } | |
441 | ||
442 | /* Returns the number of times that START would have to be incremented | |
443 | to reach FINISH. If START and FINISH are the same, returns zero. */ | |
444 | ||
445 | static ptrdiff_t | |
94edc4ab | 446 | cp_lexer_token_difference (cp_lexer* lexer, cp_token* start, cp_token* finish) |
a723baf1 MM |
447 | { |
448 | if (finish >= start) | |
449 | return finish - start; | |
450 | else | |
451 | return ((lexer->buffer_end - lexer->buffer) | |
452 | - (start - finish)); | |
453 | } | |
454 | ||
455 | /* Obtain another token from the C preprocessor and add it to the | |
456 | token buffer. Returns the newly read token. */ | |
457 | ||
458 | static cp_token * | |
94edc4ab | 459 | cp_lexer_read_token (cp_lexer* lexer) |
a723baf1 MM |
460 | { |
461 | cp_token *token; | |
462 | ||
463 | /* Make sure there is room in the buffer. */ | |
464 | cp_lexer_maybe_grow_buffer (lexer); | |
465 | ||
466 | /* If there weren't any tokens, then this one will be the first. */ | |
467 | if (!lexer->first_token) | |
468 | lexer->first_token = lexer->last_token; | |
469 | /* Similarly, if there were no available tokens, there is one now. */ | |
470 | if (!lexer->next_token) | |
471 | lexer->next_token = lexer->last_token; | |
472 | ||
473 | /* Figure out where we're going to store the new token. */ | |
474 | token = lexer->last_token; | |
475 | ||
476 | /* Get a new token from the preprocessor. */ | |
477 | cp_lexer_get_preprocessor_token (lexer, token); | |
478 | ||
479 | /* Increment LAST_TOKEN. */ | |
480 | lexer->last_token = cp_lexer_next_token (lexer, token); | |
481 | ||
e6cc3a24 ZW |
482 | /* Strings should have type `const char []'. Right now, we will |
483 | have an ARRAY_TYPE that is constant rather than an array of | |
484 | constant elements. | |
485 | FIXME: Make fix_string_type get this right in the first place. */ | |
486 | if ((token->type == CPP_STRING || token->type == CPP_WSTRING) | |
487 | && flag_const_strings) | |
a723baf1 | 488 | { |
e6cc3a24 ZW |
489 | tree type; |
490 | ||
491 | /* Get the current type. It will be an ARRAY_TYPE. */ | |
492 | type = TREE_TYPE (token->value); | |
493 | /* Use build_cplus_array_type to rebuild the array, thereby | |
494 | getting the right type. */ | |
495 | type = build_cplus_array_type (TREE_TYPE (type), TYPE_DOMAIN (type)); | |
496 | /* Reset the type of the token. */ | |
497 | TREE_TYPE (token->value) = type; | |
a723baf1 MM |
498 | } |
499 | ||
500 | return token; | |
501 | } | |
502 | ||
503 | /* If the circular buffer is full, make it bigger. */ | |
504 | ||
505 | static void | |
94edc4ab | 506 | cp_lexer_maybe_grow_buffer (cp_lexer* lexer) |
a723baf1 MM |
507 | { |
508 | /* If the buffer is full, enlarge it. */ | |
509 | if (lexer->last_token == lexer->first_token) | |
510 | { | |
511 | cp_token *new_buffer; | |
512 | cp_token *old_buffer; | |
513 | cp_token *new_first_token; | |
514 | ptrdiff_t buffer_length; | |
515 | size_t num_tokens_to_copy; | |
516 | ||
517 | /* Remember the current buffer pointer. It will become invalid, | |
518 | but we will need to do pointer arithmetic involving this | |
519 | value. */ | |
520 | old_buffer = lexer->buffer; | |
521 | /* Compute the current buffer size. */ | |
522 | buffer_length = lexer->buffer_end - lexer->buffer; | |
523 | /* Allocate a buffer twice as big. */ | |
524 | new_buffer = ((cp_token *) | |
525 | ggc_realloc (lexer->buffer, | |
526 | 2 * buffer_length * sizeof (cp_token))); | |
527 | ||
528 | /* Because the buffer is circular, logically consecutive tokens | |
529 | are not necessarily placed consecutively in memory. | |
530 | Therefore, we must keep move the tokens that were before | |
531 | FIRST_TOKEN to the second half of the newly allocated | |
532 | buffer. */ | |
533 | num_tokens_to_copy = (lexer->first_token - old_buffer); | |
534 | memcpy (new_buffer + buffer_length, | |
535 | new_buffer, | |
536 | num_tokens_to_copy * sizeof (cp_token)); | |
537 | /* Clear the rest of the buffer. We never look at this storage, | |
538 | but the garbage collector may. */ | |
539 | memset (new_buffer + buffer_length + num_tokens_to_copy, 0, | |
540 | (buffer_length - num_tokens_to_copy) * sizeof (cp_token)); | |
541 | ||
542 | /* Now recompute all of the buffer pointers. */ | |
543 | new_first_token | |
544 | = new_buffer + (lexer->first_token - old_buffer); | |
545 | if (lexer->next_token != NULL) | |
546 | { | |
547 | ptrdiff_t next_token_delta; | |
548 | ||
549 | if (lexer->next_token > lexer->first_token) | |
550 | next_token_delta = lexer->next_token - lexer->first_token; | |
551 | else | |
552 | next_token_delta = | |
553 | buffer_length - (lexer->first_token - lexer->next_token); | |
554 | lexer->next_token = new_first_token + next_token_delta; | |
555 | } | |
556 | lexer->last_token = new_first_token + buffer_length; | |
557 | lexer->buffer = new_buffer; | |
558 | lexer->buffer_end = new_buffer + buffer_length * 2; | |
559 | lexer->first_token = new_first_token; | |
560 | } | |
561 | } | |
562 | ||
563 | /* Store the next token from the preprocessor in *TOKEN. */ | |
564 | ||
565 | static void | |
94edc4ab NN |
566 | cp_lexer_get_preprocessor_token (cp_lexer *lexer ATTRIBUTE_UNUSED , |
567 | cp_token *token) | |
a723baf1 MM |
568 | { |
569 | bool done; | |
570 | ||
571 | /* If this not the main lexer, return a terminating CPP_EOF token. */ | |
17211ab5 | 572 | if (lexer != NULL && !lexer->main_lexer_p) |
a723baf1 MM |
573 | { |
574 | token->type = CPP_EOF; | |
82a98427 NS |
575 | token->location.line = 0; |
576 | token->location.file = NULL; | |
a723baf1 MM |
577 | token->value = NULL_TREE; |
578 | token->keyword = RID_MAX; | |
579 | ||
580 | return; | |
581 | } | |
582 | ||
583 | done = false; | |
584 | /* Keep going until we get a token we like. */ | |
585 | while (!done) | |
586 | { | |
587 | /* Get a new token from the preprocessor. */ | |
588 | token->type = c_lex (&token->value); | |
589 | /* Issue messages about tokens we cannot process. */ | |
590 | switch (token->type) | |
591 | { | |
592 | case CPP_ATSIGN: | |
593 | case CPP_HASH: | |
594 | case CPP_PASTE: | |
595 | error ("invalid token"); | |
596 | break; | |
597 | ||
a723baf1 MM |
598 | default: |
599 | /* This is a good token, so we exit the loop. */ | |
600 | done = true; | |
601 | break; | |
602 | } | |
603 | } | |
604 | /* Now we've got our token. */ | |
82a98427 | 605 | token->location = input_location; |
a723baf1 MM |
606 | |
607 | /* Check to see if this token is a keyword. */ | |
608 | if (token->type == CPP_NAME | |
609 | && C_IS_RESERVED_WORD (token->value)) | |
610 | { | |
611 | /* Mark this token as a keyword. */ | |
612 | token->type = CPP_KEYWORD; | |
613 | /* Record which keyword. */ | |
614 | token->keyword = C_RID_CODE (token->value); | |
615 | /* Update the value. Some keywords are mapped to particular | |
616 | entities, rather than simply having the value of the | |
617 | corresponding IDENTIFIER_NODE. For example, `__const' is | |
618 | mapped to `const'. */ | |
619 | token->value = ridpointers[token->keyword]; | |
620 | } | |
621 | else | |
622 | token->keyword = RID_MAX; | |
623 | } | |
624 | ||
625 | /* Return a pointer to the next token in the token stream, but do not | |
626 | consume it. */ | |
627 | ||
628 | static cp_token * | |
94edc4ab | 629 | cp_lexer_peek_token (cp_lexer* lexer) |
a723baf1 MM |
630 | { |
631 | cp_token *token; | |
632 | ||
633 | /* If there are no tokens, read one now. */ | |
634 | if (!lexer->next_token) | |
635 | cp_lexer_read_token (lexer); | |
636 | ||
637 | /* Provide debugging output. */ | |
638 | if (cp_lexer_debugging_p (lexer)) | |
639 | { | |
640 | fprintf (cp_lexer_debug_stream, "cp_lexer: peeking at token: "); | |
641 | cp_lexer_print_token (cp_lexer_debug_stream, lexer->next_token); | |
642 | fprintf (cp_lexer_debug_stream, "\n"); | |
643 | } | |
644 | ||
645 | token = lexer->next_token; | |
646 | cp_lexer_set_source_position_from_token (lexer, token); | |
647 | return token; | |
648 | } | |
649 | ||
650 | /* Return true if the next token has the indicated TYPE. */ | |
651 | ||
652 | static bool | |
94edc4ab | 653 | cp_lexer_next_token_is (cp_lexer* lexer, enum cpp_ttype type) |
a723baf1 MM |
654 | { |
655 | cp_token *token; | |
656 | ||
657 | /* Peek at the next token. */ | |
658 | token = cp_lexer_peek_token (lexer); | |
659 | /* Check to see if it has the indicated TYPE. */ | |
660 | return token->type == type; | |
661 | } | |
662 | ||
663 | /* Return true if the next token does not have the indicated TYPE. */ | |
664 | ||
665 | static bool | |
94edc4ab | 666 | cp_lexer_next_token_is_not (cp_lexer* lexer, enum cpp_ttype type) |
a723baf1 MM |
667 | { |
668 | return !cp_lexer_next_token_is (lexer, type); | |
669 | } | |
670 | ||
671 | /* Return true if the next token is the indicated KEYWORD. */ | |
672 | ||
673 | static bool | |
94edc4ab | 674 | cp_lexer_next_token_is_keyword (cp_lexer* lexer, enum rid keyword) |
a723baf1 MM |
675 | { |
676 | cp_token *token; | |
677 | ||
678 | /* Peek at the next token. */ | |
679 | token = cp_lexer_peek_token (lexer); | |
680 | /* Check to see if it is the indicated keyword. */ | |
681 | return token->keyword == keyword; | |
682 | } | |
683 | ||
684 | /* Return a pointer to the Nth token in the token stream. If N is 1, | |
685 | then this is precisely equivalent to cp_lexer_peek_token. */ | |
686 | ||
687 | static cp_token * | |
94edc4ab | 688 | cp_lexer_peek_nth_token (cp_lexer* lexer, size_t n) |
a723baf1 MM |
689 | { |
690 | cp_token *token; | |
691 | ||
692 | /* N is 1-based, not zero-based. */ | |
693 | my_friendly_assert (n > 0, 20000224); | |
694 | ||
695 | /* Skip ahead from NEXT_TOKEN, reading more tokens as necessary. */ | |
696 | token = lexer->next_token; | |
697 | /* If there are no tokens in the buffer, get one now. */ | |
698 | if (!token) | |
699 | { | |
700 | cp_lexer_read_token (lexer); | |
701 | token = lexer->next_token; | |
702 | } | |
703 | ||
704 | /* Now, read tokens until we have enough. */ | |
705 | while (--n > 0) | |
706 | { | |
707 | /* Advance to the next token. */ | |
708 | token = cp_lexer_next_token (lexer, token); | |
709 | /* If that's all the tokens we have, read a new one. */ | |
710 | if (token == lexer->last_token) | |
711 | token = cp_lexer_read_token (lexer); | |
712 | } | |
713 | ||
714 | return token; | |
715 | } | |
716 | ||
717 | /* Consume the next token. The pointer returned is valid only until | |
718 | another token is read. Callers should preserve copy the token | |
719 | explicitly if they will need its value for a longer period of | |
720 | time. */ | |
721 | ||
722 | static cp_token * | |
94edc4ab | 723 | cp_lexer_consume_token (cp_lexer* lexer) |
a723baf1 MM |
724 | { |
725 | cp_token *token; | |
726 | ||
727 | /* If there are no tokens, read one now. */ | |
728 | if (!lexer->next_token) | |
729 | cp_lexer_read_token (lexer); | |
730 | ||
731 | /* Remember the token we'll be returning. */ | |
732 | token = lexer->next_token; | |
733 | ||
734 | /* Increment NEXT_TOKEN. */ | |
735 | lexer->next_token = cp_lexer_next_token (lexer, | |
736 | lexer->next_token); | |
737 | /* Check to see if we're all out of tokens. */ | |
738 | if (lexer->next_token == lexer->last_token) | |
739 | lexer->next_token = NULL; | |
740 | ||
741 | /* If we're not saving tokens, then move FIRST_TOKEN too. */ | |
742 | if (!cp_lexer_saving_tokens (lexer)) | |
743 | { | |
744 | /* If there are no tokens available, set FIRST_TOKEN to NULL. */ | |
745 | if (!lexer->next_token) | |
746 | lexer->first_token = NULL; | |
747 | else | |
748 | lexer->first_token = lexer->next_token; | |
749 | } | |
750 | ||
751 | /* Provide debugging output. */ | |
752 | if (cp_lexer_debugging_p (lexer)) | |
753 | { | |
754 | fprintf (cp_lexer_debug_stream, "cp_lexer: consuming token: "); | |
755 | cp_lexer_print_token (cp_lexer_debug_stream, token); | |
756 | fprintf (cp_lexer_debug_stream, "\n"); | |
757 | } | |
758 | ||
759 | return token; | |
760 | } | |
761 | ||
762 | /* Permanently remove the next token from the token stream. There | |
763 | must be a valid next token already; this token never reads | |
764 | additional tokens from the preprocessor. */ | |
765 | ||
766 | static void | |
767 | cp_lexer_purge_token (cp_lexer *lexer) | |
768 | { | |
769 | cp_token *token; | |
770 | cp_token *next_token; | |
771 | ||
772 | token = lexer->next_token; | |
773 | while (true) | |
774 | { | |
775 | next_token = cp_lexer_next_token (lexer, token); | |
776 | if (next_token == lexer->last_token) | |
777 | break; | |
778 | *token = *next_token; | |
779 | token = next_token; | |
780 | } | |
781 | ||
782 | lexer->last_token = token; | |
783 | /* The token purged may have been the only token remaining; if so, | |
784 | clear NEXT_TOKEN. */ | |
785 | if (lexer->next_token == token) | |
786 | lexer->next_token = NULL; | |
787 | } | |
788 | ||
789 | /* Permanently remove all tokens after TOKEN, up to, but not | |
790 | including, the token that will be returned next by | |
791 | cp_lexer_peek_token. */ | |
792 | ||
793 | static void | |
794 | cp_lexer_purge_tokens_after (cp_lexer *lexer, cp_token *token) | |
795 | { | |
796 | cp_token *peek; | |
797 | cp_token *t1; | |
798 | cp_token *t2; | |
799 | ||
800 | if (lexer->next_token) | |
801 | { | |
802 | /* Copy the tokens that have not yet been read to the location | |
803 | immediately following TOKEN. */ | |
804 | t1 = cp_lexer_next_token (lexer, token); | |
805 | t2 = peek = cp_lexer_peek_token (lexer); | |
806 | /* Move tokens into the vacant area between TOKEN and PEEK. */ | |
807 | while (t2 != lexer->last_token) | |
808 | { | |
809 | *t1 = *t2; | |
810 | t1 = cp_lexer_next_token (lexer, t1); | |
811 | t2 = cp_lexer_next_token (lexer, t2); | |
812 | } | |
813 | /* Now, the next available token is right after TOKEN. */ | |
814 | lexer->next_token = cp_lexer_next_token (lexer, token); | |
815 | /* And the last token is wherever we ended up. */ | |
816 | lexer->last_token = t1; | |
817 | } | |
818 | else | |
819 | { | |
820 | /* There are no tokens in the buffer, so there is nothing to | |
821 | copy. The last token in the buffer is TOKEN itself. */ | |
822 | lexer->last_token = cp_lexer_next_token (lexer, token); | |
823 | } | |
824 | } | |
825 | ||
826 | /* Begin saving tokens. All tokens consumed after this point will be | |
827 | preserved. */ | |
828 | ||
829 | static void | |
94edc4ab | 830 | cp_lexer_save_tokens (cp_lexer* lexer) |
a723baf1 MM |
831 | { |
832 | /* Provide debugging output. */ | |
833 | if (cp_lexer_debugging_p (lexer)) | |
834 | fprintf (cp_lexer_debug_stream, "cp_lexer: saving tokens\n"); | |
835 | ||
836 | /* Make sure that LEXER->NEXT_TOKEN is non-NULL so that we can | |
837 | restore the tokens if required. */ | |
838 | if (!lexer->next_token) | |
839 | cp_lexer_read_token (lexer); | |
840 | ||
841 | VARRAY_PUSH_INT (lexer->saved_tokens, | |
842 | cp_lexer_token_difference (lexer, | |
843 | lexer->first_token, | |
844 | lexer->next_token)); | |
845 | } | |
846 | ||
847 | /* Commit to the portion of the token stream most recently saved. */ | |
848 | ||
849 | static void | |
94edc4ab | 850 | cp_lexer_commit_tokens (cp_lexer* lexer) |
a723baf1 MM |
851 | { |
852 | /* Provide debugging output. */ | |
853 | if (cp_lexer_debugging_p (lexer)) | |
854 | fprintf (cp_lexer_debug_stream, "cp_lexer: committing tokens\n"); | |
855 | ||
856 | VARRAY_POP (lexer->saved_tokens); | |
857 | } | |
858 | ||
859 | /* Return all tokens saved since the last call to cp_lexer_save_tokens | |
860 | to the token stream. Stop saving tokens. */ | |
861 | ||
862 | static void | |
94edc4ab | 863 | cp_lexer_rollback_tokens (cp_lexer* lexer) |
a723baf1 MM |
864 | { |
865 | size_t delta; | |
866 | ||
867 | /* Provide debugging output. */ | |
868 | if (cp_lexer_debugging_p (lexer)) | |
869 | fprintf (cp_lexer_debug_stream, "cp_lexer: restoring tokens\n"); | |
870 | ||
871 | /* Find the token that was the NEXT_TOKEN when we started saving | |
872 | tokens. */ | |
873 | delta = VARRAY_TOP_INT(lexer->saved_tokens); | |
874 | /* Make it the next token again now. */ | |
875 | lexer->next_token = cp_lexer_advance_token (lexer, | |
876 | lexer->first_token, | |
877 | delta); | |
15d2cb19 | 878 | /* It might be the case that there were no tokens when we started |
a723baf1 MM |
879 | saving tokens, but that there are some tokens now. */ |
880 | if (!lexer->next_token && lexer->first_token) | |
881 | lexer->next_token = lexer->first_token; | |
882 | ||
883 | /* Stop saving tokens. */ | |
884 | VARRAY_POP (lexer->saved_tokens); | |
885 | } | |
886 | ||
a723baf1 MM |
887 | /* Print a representation of the TOKEN on the STREAM. */ |
888 | ||
889 | static void | |
94edc4ab | 890 | cp_lexer_print_token (FILE * stream, cp_token* token) |
a723baf1 MM |
891 | { |
892 | const char *token_type = NULL; | |
893 | ||
894 | /* Figure out what kind of token this is. */ | |
895 | switch (token->type) | |
896 | { | |
897 | case CPP_EQ: | |
898 | token_type = "EQ"; | |
899 | break; | |
900 | ||
901 | case CPP_COMMA: | |
902 | token_type = "COMMA"; | |
903 | break; | |
904 | ||
905 | case CPP_OPEN_PAREN: | |
906 | token_type = "OPEN_PAREN"; | |
907 | break; | |
908 | ||
909 | case CPP_CLOSE_PAREN: | |
910 | token_type = "CLOSE_PAREN"; | |
911 | break; | |
912 | ||
913 | case CPP_OPEN_BRACE: | |
914 | token_type = "OPEN_BRACE"; | |
915 | break; | |
916 | ||
917 | case CPP_CLOSE_BRACE: | |
918 | token_type = "CLOSE_BRACE"; | |
919 | break; | |
920 | ||
921 | case CPP_SEMICOLON: | |
922 | token_type = "SEMICOLON"; | |
923 | break; | |
924 | ||
925 | case CPP_NAME: | |
926 | token_type = "NAME"; | |
927 | break; | |
928 | ||
929 | case CPP_EOF: | |
930 | token_type = "EOF"; | |
931 | break; | |
932 | ||
933 | case CPP_KEYWORD: | |
934 | token_type = "keyword"; | |
935 | break; | |
936 | ||
937 | /* This is not a token that we know how to handle yet. */ | |
938 | default: | |
939 | break; | |
940 | } | |
941 | ||
942 | /* If we have a name for the token, print it out. Otherwise, we | |
943 | simply give the numeric code. */ | |
944 | if (token_type) | |
945 | fprintf (stream, "%s", token_type); | |
946 | else | |
947 | fprintf (stream, "%d", token->type); | |
948 | /* And, for an identifier, print the identifier name. */ | |
949 | if (token->type == CPP_NAME | |
950 | /* Some keywords have a value that is not an IDENTIFIER_NODE. | |
951 | For example, `struct' is mapped to an INTEGER_CST. */ | |
952 | || (token->type == CPP_KEYWORD | |
953 | && TREE_CODE (token->value) == IDENTIFIER_NODE)) | |
954 | fprintf (stream, " %s", IDENTIFIER_POINTER (token->value)); | |
955 | } | |
956 | ||
a723baf1 MM |
957 | /* Start emitting debugging information. */ |
958 | ||
959 | static void | |
94edc4ab | 960 | cp_lexer_start_debugging (cp_lexer* lexer) |
a723baf1 MM |
961 | { |
962 | ++lexer->debugging_p; | |
963 | } | |
964 | ||
965 | /* Stop emitting debugging information. */ | |
966 | ||
967 | static void | |
94edc4ab | 968 | cp_lexer_stop_debugging (cp_lexer* lexer) |
a723baf1 MM |
969 | { |
970 | --lexer->debugging_p; | |
971 | } | |
972 | ||
973 | \f | |
974 | /* The parser. */ | |
975 | ||
976 | /* Overview | |
977 | -------- | |
978 | ||
979 | A cp_parser parses the token stream as specified by the C++ | |
980 | grammar. Its job is purely parsing, not semantic analysis. For | |
981 | example, the parser breaks the token stream into declarators, | |
982 | expressions, statements, and other similar syntactic constructs. | |
983 | It does not check that the types of the expressions on either side | |
984 | of an assignment-statement are compatible, or that a function is | |
985 | not declared with a parameter of type `void'. | |
986 | ||
987 | The parser invokes routines elsewhere in the compiler to perform | |
988 | semantic analysis and to build up the abstract syntax tree for the | |
989 | code processed. | |
990 | ||
991 | The parser (and the template instantiation code, which is, in a | |
992 | way, a close relative of parsing) are the only parts of the | |
993 | compiler that should be calling push_scope and pop_scope, or | |
994 | related functions. The parser (and template instantiation code) | |
995 | keeps track of what scope is presently active; everything else | |
996 | should simply honor that. (The code that generates static | |
997 | initializers may also need to set the scope, in order to check | |
998 | access control correctly when emitting the initializers.) | |
999 | ||
1000 | Methodology | |
1001 | ----------- | |
1002 | ||
1003 | The parser is of the standard recursive-descent variety. Upcoming | |
1004 | tokens in the token stream are examined in order to determine which | |
1005 | production to use when parsing a non-terminal. Some C++ constructs | |
1006 | require arbitrary look ahead to disambiguate. For example, it is | |
1007 | impossible, in the general case, to tell whether a statement is an | |
1008 | expression or declaration without scanning the entire statement. | |
1009 | Therefore, the parser is capable of "parsing tentatively." When the | |
1010 | parser is not sure what construct comes next, it enters this mode. | |
1011 | Then, while we attempt to parse the construct, the parser queues up | |
1012 | error messages, rather than issuing them immediately, and saves the | |
1013 | tokens it consumes. If the construct is parsed successfully, the | |
1014 | parser "commits", i.e., it issues any queued error messages and | |
1015 | the tokens that were being preserved are permanently discarded. | |
1016 | If, however, the construct is not parsed successfully, the parser | |
1017 | rolls back its state completely so that it can resume parsing using | |
1018 | a different alternative. | |
1019 | ||
1020 | Future Improvements | |
1021 | ------------------- | |
1022 | ||
1023 | The performance of the parser could probably be improved | |
1024 | substantially. Some possible improvements include: | |
1025 | ||
1026 | - The expression parser recurses through the various levels of | |
1027 | precedence as specified in the grammar, rather than using an | |
1028 | operator-precedence technique. Therefore, parsing a simple | |
1029 | identifier requires multiple recursive calls. | |
1030 | ||
1031 | - We could often eliminate the need to parse tentatively by | |
1032 | looking ahead a little bit. In some places, this approach | |
1033 | might not entirely eliminate the need to parse tentatively, but | |
1034 | it might still speed up the average case. */ | |
1035 | ||
1036 | /* Flags that are passed to some parsing functions. These values can | |
1037 | be bitwise-ored together. */ | |
1038 | ||
1039 | typedef enum cp_parser_flags | |
1040 | { | |
1041 | /* No flags. */ | |
1042 | CP_PARSER_FLAGS_NONE = 0x0, | |
1043 | /* The construct is optional. If it is not present, then no error | |
1044 | should be issued. */ | |
1045 | CP_PARSER_FLAGS_OPTIONAL = 0x1, | |
1046 | /* When parsing a type-specifier, do not allow user-defined types. */ | |
1047 | CP_PARSER_FLAGS_NO_USER_DEFINED_TYPES = 0x2 | |
1048 | } cp_parser_flags; | |
1049 | ||
62b8a44e NS |
1050 | /* The different kinds of declarators we want to parse. */ |
1051 | ||
1052 | typedef enum cp_parser_declarator_kind | |
1053 | { | |
9bcb9aae | 1054 | /* We want an abstract declartor. */ |
62b8a44e NS |
1055 | CP_PARSER_DECLARATOR_ABSTRACT, |
1056 | /* We want a named declarator. */ | |
1057 | CP_PARSER_DECLARATOR_NAMED, | |
712becab | 1058 | /* We don't mind, but the name must be an unqualified-id */ |
62b8a44e NS |
1059 | CP_PARSER_DECLARATOR_EITHER |
1060 | } cp_parser_declarator_kind; | |
1061 | ||
a723baf1 MM |
1062 | /* A mapping from a token type to a corresponding tree node type. */ |
1063 | ||
1064 | typedef struct cp_parser_token_tree_map_node | |
1065 | { | |
1066 | /* The token type. */ | |
1067 | enum cpp_ttype token_type; | |
1068 | /* The corresponding tree code. */ | |
1069 | enum tree_code tree_type; | |
1070 | } cp_parser_token_tree_map_node; | |
1071 | ||
1072 | /* A complete map consists of several ordinary entries, followed by a | |
1073 | terminator. The terminating entry has a token_type of CPP_EOF. */ | |
1074 | ||
1075 | typedef cp_parser_token_tree_map_node cp_parser_token_tree_map[]; | |
1076 | ||
1077 | /* The status of a tentative parse. */ | |
1078 | ||
1079 | typedef enum cp_parser_status_kind | |
1080 | { | |
1081 | /* No errors have occurred. */ | |
1082 | CP_PARSER_STATUS_KIND_NO_ERROR, | |
1083 | /* An error has occurred. */ | |
1084 | CP_PARSER_STATUS_KIND_ERROR, | |
1085 | /* We are committed to this tentative parse, whether or not an error | |
1086 | has occurred. */ | |
1087 | CP_PARSER_STATUS_KIND_COMMITTED | |
1088 | } cp_parser_status_kind; | |
1089 | ||
1090 | /* Context that is saved and restored when parsing tentatively. */ | |
1091 | ||
1092 | typedef struct cp_parser_context GTY (()) | |
1093 | { | |
1094 | /* If this is a tentative parsing context, the status of the | |
1095 | tentative parse. */ | |
1096 | enum cp_parser_status_kind status; | |
1097 | /* If non-NULL, we have just seen a `x->' or `x.' expression. Names | |
1098 | that are looked up in this context must be looked up both in the | |
1099 | scope given by OBJECT_TYPE (the type of `x' or `*x') and also in | |
1100 | the context of the containing expression. */ | |
1101 | tree object_type; | |
a723baf1 MM |
1102 | /* The next parsing context in the stack. */ |
1103 | struct cp_parser_context *next; | |
1104 | } cp_parser_context; | |
1105 | ||
1106 | /* Prototypes. */ | |
1107 | ||
1108 | /* Constructors and destructors. */ | |
1109 | ||
1110 | static cp_parser_context *cp_parser_context_new | |
94edc4ab | 1111 | (cp_parser_context *); |
a723baf1 | 1112 | |
e5976695 MM |
1113 | /* Class variables. */ |
1114 | ||
92bc1323 | 1115 | static GTY((deletable (""))) cp_parser_context* cp_parser_context_free_list; |
e5976695 | 1116 | |
a723baf1 MM |
1117 | /* Constructors and destructors. */ |
1118 | ||
1119 | /* Construct a new context. The context below this one on the stack | |
1120 | is given by NEXT. */ | |
1121 | ||
1122 | static cp_parser_context * | |
94edc4ab | 1123 | cp_parser_context_new (cp_parser_context* next) |
a723baf1 MM |
1124 | { |
1125 | cp_parser_context *context; | |
1126 | ||
1127 | /* Allocate the storage. */ | |
e5976695 MM |
1128 | if (cp_parser_context_free_list != NULL) |
1129 | { | |
1130 | /* Pull the first entry from the free list. */ | |
1131 | context = cp_parser_context_free_list; | |
1132 | cp_parser_context_free_list = context->next; | |
1133 | memset ((char *)context, 0, sizeof (*context)); | |
1134 | } | |
1135 | else | |
1136 | context = ((cp_parser_context *) | |
1137 | ggc_alloc_cleared (sizeof (cp_parser_context))); | |
a723baf1 MM |
1138 | /* No errors have occurred yet in this context. */ |
1139 | context->status = CP_PARSER_STATUS_KIND_NO_ERROR; | |
1140 | /* If this is not the bottomost context, copy information that we | |
1141 | need from the previous context. */ | |
1142 | if (next) | |
1143 | { | |
1144 | /* If, in the NEXT context, we are parsing an `x->' or `x.' | |
1145 | expression, then we are parsing one in this context, too. */ | |
1146 | context->object_type = next->object_type; | |
a723baf1 MM |
1147 | /* Thread the stack. */ |
1148 | context->next = next; | |
1149 | } | |
1150 | ||
1151 | return context; | |
1152 | } | |
1153 | ||
1154 | /* The cp_parser structure represents the C++ parser. */ | |
1155 | ||
1156 | typedef struct cp_parser GTY(()) | |
1157 | { | |
1158 | /* The lexer from which we are obtaining tokens. */ | |
1159 | cp_lexer *lexer; | |
1160 | ||
1161 | /* The scope in which names should be looked up. If NULL_TREE, then | |
1162 | we look up names in the scope that is currently open in the | |
1163 | source program. If non-NULL, this is either a TYPE or | |
1164 | NAMESPACE_DECL for the scope in which we should look. | |
1165 | ||
1166 | This value is not cleared automatically after a name is looked | |
1167 | up, so we must be careful to clear it before starting a new look | |
1168 | up sequence. (If it is not cleared, then `X::Y' followed by `Z' | |
1169 | will look up `Z' in the scope of `X', rather than the current | |
1170 | scope.) Unfortunately, it is difficult to tell when name lookup | |
1171 | is complete, because we sometimes peek at a token, look it up, | |
1172 | and then decide not to consume it. */ | |
1173 | tree scope; | |
1174 | ||
1175 | /* OBJECT_SCOPE and QUALIFYING_SCOPE give the scopes in which the | |
1176 | last lookup took place. OBJECT_SCOPE is used if an expression | |
1177 | like "x->y" or "x.y" was used; it gives the type of "*x" or "x", | |
1178 | respectively. QUALIFYING_SCOPE is used for an expression of the | |
1179 | form "X::Y"; it refers to X. */ | |
1180 | tree object_scope; | |
1181 | tree qualifying_scope; | |
1182 | ||
1183 | /* A stack of parsing contexts. All but the bottom entry on the | |
1184 | stack will be tentative contexts. | |
1185 | ||
1186 | We parse tentatively in order to determine which construct is in | |
1187 | use in some situations. For example, in order to determine | |
1188 | whether a statement is an expression-statement or a | |
1189 | declaration-statement we parse it tentatively as a | |
1190 | declaration-statement. If that fails, we then reparse the same | |
1191 | token stream as an expression-statement. */ | |
1192 | cp_parser_context *context; | |
1193 | ||
1194 | /* True if we are parsing GNU C++. If this flag is not set, then | |
1195 | GNU extensions are not recognized. */ | |
1196 | bool allow_gnu_extensions_p; | |
1197 | ||
1198 | /* TRUE if the `>' token should be interpreted as the greater-than | |
1199 | operator. FALSE if it is the end of a template-id or | |
1200 | template-parameter-list. */ | |
1201 | bool greater_than_is_operator_p; | |
1202 | ||
1203 | /* TRUE if default arguments are allowed within a parameter list | |
1204 | that starts at this point. FALSE if only a gnu extension makes | |
1205 | them permissable. */ | |
1206 | bool default_arg_ok_p; | |
1207 | ||
1208 | /* TRUE if we are parsing an integral constant-expression. See | |
1209 | [expr.const] for a precise definition. */ | |
a723baf1 MM |
1210 | bool constant_expression_p; |
1211 | ||
14d22dd6 MM |
1212 | /* TRUE if we are parsing an integral constant-expression -- but a |
1213 | non-constant expression should be permitted as well. This flag | |
1214 | is used when parsing an array bound so that GNU variable-length | |
1215 | arrays are tolerated. */ | |
1216 | bool allow_non_constant_expression_p; | |
1217 | ||
1218 | /* TRUE if ALLOW_NON_CONSTANT_EXPRESSION_P is TRUE and something has | |
1219 | been seen that makes the expression non-constant. */ | |
1220 | bool non_constant_expression_p; | |
1221 | ||
a723baf1 MM |
1222 | /* TRUE if local variable names and `this' are forbidden in the |
1223 | current context. */ | |
1224 | bool local_variables_forbidden_p; | |
1225 | ||
1226 | /* TRUE if the declaration we are parsing is part of a | |
1227 | linkage-specification of the form `extern string-literal | |
1228 | declaration'. */ | |
1229 | bool in_unbraced_linkage_specification_p; | |
1230 | ||
1231 | /* TRUE if we are presently parsing a declarator, after the | |
1232 | direct-declarator. */ | |
1233 | bool in_declarator_p; | |
1234 | ||
1235 | /* If non-NULL, then we are parsing a construct where new type | |
1236 | definitions are not permitted. The string stored here will be | |
1237 | issued as an error message if a type is defined. */ | |
1238 | const char *type_definition_forbidden_message; | |
1239 | ||
8db1028e NS |
1240 | /* A list of lists. The outer list is a stack, used for member |
1241 | functions of local classes. At each level there are two sub-list, | |
1242 | one on TREE_VALUE and one on TREE_PURPOSE. Each of those | |
1243 | sub-lists has a FUNCTION_DECL or TEMPLATE_DECL on their | |
1244 | TREE_VALUE's. The functions are chained in reverse declaration | |
1245 | order. | |
1246 | ||
1247 | The TREE_PURPOSE sublist contains those functions with default | |
1248 | arguments that need post processing, and the TREE_VALUE sublist | |
1249 | contains those functions with definitions that need post | |
1250 | processing. | |
1251 | ||
1252 | These lists can only be processed once the outermost class being | |
9bcb9aae | 1253 | defined is complete. */ |
a723baf1 MM |
1254 | tree unparsed_functions_queues; |
1255 | ||
1256 | /* The number of classes whose definitions are currently in | |
1257 | progress. */ | |
1258 | unsigned num_classes_being_defined; | |
1259 | ||
1260 | /* The number of template parameter lists that apply directly to the | |
1261 | current declaration. */ | |
1262 | unsigned num_template_parameter_lists; | |
1263 | } cp_parser; | |
1264 | ||
1265 | /* The type of a function that parses some kind of expression */ | |
94edc4ab | 1266 | typedef tree (*cp_parser_expression_fn) (cp_parser *); |
a723baf1 MM |
1267 | |
1268 | /* Prototypes. */ | |
1269 | ||
1270 | /* Constructors and destructors. */ | |
1271 | ||
1272 | static cp_parser *cp_parser_new | |
94edc4ab | 1273 | (void); |
a723baf1 MM |
1274 | |
1275 | /* Routines to parse various constructs. | |
1276 | ||
1277 | Those that return `tree' will return the error_mark_node (rather | |
1278 | than NULL_TREE) if a parse error occurs, unless otherwise noted. | |
1279 | Sometimes, they will return an ordinary node if error-recovery was | |
34cd5ae7 | 1280 | attempted, even though a parse error occurred. So, to check |
a723baf1 MM |
1281 | whether or not a parse error occurred, you should always use |
1282 | cp_parser_error_occurred. If the construct is optional (indicated | |
1283 | either by an `_opt' in the name of the function that does the | |
1284 | parsing or via a FLAGS parameter), then NULL_TREE is returned if | |
1285 | the construct is not present. */ | |
1286 | ||
1287 | /* Lexical conventions [gram.lex] */ | |
1288 | ||
1289 | static tree cp_parser_identifier | |
94edc4ab | 1290 | (cp_parser *); |
a723baf1 MM |
1291 | |
1292 | /* Basic concepts [gram.basic] */ | |
1293 | ||
1294 | static bool cp_parser_translation_unit | |
94edc4ab | 1295 | (cp_parser *); |
a723baf1 MM |
1296 | |
1297 | /* Expressions [gram.expr] */ | |
1298 | ||
1299 | static tree cp_parser_primary_expression | |
b3445994 | 1300 | (cp_parser *, cp_id_kind *, tree *); |
a723baf1 | 1301 | static tree cp_parser_id_expression |
94edc4ab | 1302 | (cp_parser *, bool, bool, bool *); |
a723baf1 | 1303 | static tree cp_parser_unqualified_id |
94edc4ab | 1304 | (cp_parser *, bool, bool); |
a723baf1 MM |
1305 | static tree cp_parser_nested_name_specifier_opt |
1306 | (cp_parser *, bool, bool, bool); | |
1307 | static tree cp_parser_nested_name_specifier | |
1308 | (cp_parser *, bool, bool, bool); | |
1309 | static tree cp_parser_class_or_namespace_name | |
1310 | (cp_parser *, bool, bool, bool, bool); | |
1311 | static tree cp_parser_postfix_expression | |
1312 | (cp_parser *, bool); | |
7efa3e22 | 1313 | static tree cp_parser_parenthesized_expression_list |
39703eb9 | 1314 | (cp_parser *, bool, bool *); |
a723baf1 | 1315 | static void cp_parser_pseudo_destructor_name |
94edc4ab | 1316 | (cp_parser *, tree *, tree *); |
a723baf1 MM |
1317 | static tree cp_parser_unary_expression |
1318 | (cp_parser *, bool); | |
1319 | static enum tree_code cp_parser_unary_operator | |
94edc4ab | 1320 | (cp_token *); |
a723baf1 | 1321 | static tree cp_parser_new_expression |
94edc4ab | 1322 | (cp_parser *); |
a723baf1 | 1323 | static tree cp_parser_new_placement |
94edc4ab | 1324 | (cp_parser *); |
a723baf1 | 1325 | static tree cp_parser_new_type_id |
94edc4ab | 1326 | (cp_parser *); |
a723baf1 | 1327 | static tree cp_parser_new_declarator_opt |
94edc4ab | 1328 | (cp_parser *); |
a723baf1 | 1329 | static tree cp_parser_direct_new_declarator |
94edc4ab | 1330 | (cp_parser *); |
a723baf1 | 1331 | static tree cp_parser_new_initializer |
94edc4ab | 1332 | (cp_parser *); |
a723baf1 | 1333 | static tree cp_parser_delete_expression |
94edc4ab | 1334 | (cp_parser *); |
a723baf1 MM |
1335 | static tree cp_parser_cast_expression |
1336 | (cp_parser *, bool); | |
1337 | static tree cp_parser_pm_expression | |
94edc4ab | 1338 | (cp_parser *); |
a723baf1 | 1339 | static tree cp_parser_multiplicative_expression |
94edc4ab | 1340 | (cp_parser *); |
a723baf1 | 1341 | static tree cp_parser_additive_expression |
94edc4ab | 1342 | (cp_parser *); |
a723baf1 | 1343 | static tree cp_parser_shift_expression |
94edc4ab | 1344 | (cp_parser *); |
a723baf1 | 1345 | static tree cp_parser_relational_expression |
94edc4ab | 1346 | (cp_parser *); |
a723baf1 | 1347 | static tree cp_parser_equality_expression |
94edc4ab | 1348 | (cp_parser *); |
a723baf1 | 1349 | static tree cp_parser_and_expression |
94edc4ab | 1350 | (cp_parser *); |
a723baf1 | 1351 | static tree cp_parser_exclusive_or_expression |
94edc4ab | 1352 | (cp_parser *); |
a723baf1 | 1353 | static tree cp_parser_inclusive_or_expression |
94edc4ab | 1354 | (cp_parser *); |
a723baf1 | 1355 | static tree cp_parser_logical_and_expression |
94edc4ab | 1356 | (cp_parser *); |
a723baf1 | 1357 | static tree cp_parser_logical_or_expression |
94edc4ab | 1358 | (cp_parser *); |
a723baf1 | 1359 | static tree cp_parser_question_colon_clause |
94edc4ab | 1360 | (cp_parser *, tree); |
a723baf1 | 1361 | static tree cp_parser_assignment_expression |
94edc4ab | 1362 | (cp_parser *); |
a723baf1 | 1363 | static enum tree_code cp_parser_assignment_operator_opt |
94edc4ab | 1364 | (cp_parser *); |
a723baf1 | 1365 | static tree cp_parser_expression |
94edc4ab | 1366 | (cp_parser *); |
a723baf1 | 1367 | static tree cp_parser_constant_expression |
14d22dd6 | 1368 | (cp_parser *, bool, bool *); |
a723baf1 MM |
1369 | |
1370 | /* Statements [gram.stmt.stmt] */ | |
1371 | ||
1372 | static void cp_parser_statement | |
94edc4ab | 1373 | (cp_parser *); |
a723baf1 | 1374 | static tree cp_parser_labeled_statement |
94edc4ab | 1375 | (cp_parser *); |
a723baf1 | 1376 | static tree cp_parser_expression_statement |
94edc4ab | 1377 | (cp_parser *); |
a723baf1 MM |
1378 | static tree cp_parser_compound_statement |
1379 | (cp_parser *); | |
1380 | static void cp_parser_statement_seq_opt | |
94edc4ab | 1381 | (cp_parser *); |
a723baf1 | 1382 | static tree cp_parser_selection_statement |
94edc4ab | 1383 | (cp_parser *); |
a723baf1 | 1384 | static tree cp_parser_condition |
94edc4ab | 1385 | (cp_parser *); |
a723baf1 | 1386 | static tree cp_parser_iteration_statement |
94edc4ab | 1387 | (cp_parser *); |
a723baf1 | 1388 | static void cp_parser_for_init_statement |
94edc4ab | 1389 | (cp_parser *); |
a723baf1 | 1390 | static tree cp_parser_jump_statement |
94edc4ab | 1391 | (cp_parser *); |
a723baf1 | 1392 | static void cp_parser_declaration_statement |
94edc4ab | 1393 | (cp_parser *); |
a723baf1 MM |
1394 | |
1395 | static tree cp_parser_implicitly_scoped_statement | |
94edc4ab | 1396 | (cp_parser *); |
a723baf1 | 1397 | static void cp_parser_already_scoped_statement |
94edc4ab | 1398 | (cp_parser *); |
a723baf1 MM |
1399 | |
1400 | /* Declarations [gram.dcl.dcl] */ | |
1401 | ||
1402 | static void cp_parser_declaration_seq_opt | |
94edc4ab | 1403 | (cp_parser *); |
a723baf1 | 1404 | static void cp_parser_declaration |
94edc4ab | 1405 | (cp_parser *); |
a723baf1 | 1406 | static void cp_parser_block_declaration |
94edc4ab | 1407 | (cp_parser *, bool); |
a723baf1 | 1408 | static void cp_parser_simple_declaration |
94edc4ab | 1409 | (cp_parser *, bool); |
a723baf1 | 1410 | static tree cp_parser_decl_specifier_seq |
94edc4ab | 1411 | (cp_parser *, cp_parser_flags, tree *, bool *); |
a723baf1 | 1412 | static tree cp_parser_storage_class_specifier_opt |
94edc4ab | 1413 | (cp_parser *); |
a723baf1 | 1414 | static tree cp_parser_function_specifier_opt |
94edc4ab | 1415 | (cp_parser *); |
a723baf1 | 1416 | static tree cp_parser_type_specifier |
94edc4ab | 1417 | (cp_parser *, cp_parser_flags, bool, bool, bool *, bool *); |
a723baf1 | 1418 | static tree cp_parser_simple_type_specifier |
94edc4ab | 1419 | (cp_parser *, cp_parser_flags); |
a723baf1 | 1420 | static tree cp_parser_type_name |
94edc4ab | 1421 | (cp_parser *); |
a723baf1 | 1422 | static tree cp_parser_elaborated_type_specifier |
94edc4ab | 1423 | (cp_parser *, bool, bool); |
a723baf1 | 1424 | static tree cp_parser_enum_specifier |
94edc4ab | 1425 | (cp_parser *); |
a723baf1 | 1426 | static void cp_parser_enumerator_list |
94edc4ab | 1427 | (cp_parser *, tree); |
a723baf1 | 1428 | static void cp_parser_enumerator_definition |
94edc4ab | 1429 | (cp_parser *, tree); |
a723baf1 | 1430 | static tree cp_parser_namespace_name |
94edc4ab | 1431 | (cp_parser *); |
a723baf1 | 1432 | static void cp_parser_namespace_definition |
94edc4ab | 1433 | (cp_parser *); |
a723baf1 | 1434 | static void cp_parser_namespace_body |
94edc4ab | 1435 | (cp_parser *); |
a723baf1 | 1436 | static tree cp_parser_qualified_namespace_specifier |
94edc4ab | 1437 | (cp_parser *); |
a723baf1 | 1438 | static void cp_parser_namespace_alias_definition |
94edc4ab | 1439 | (cp_parser *); |
a723baf1 | 1440 | static void cp_parser_using_declaration |
94edc4ab | 1441 | (cp_parser *); |
a723baf1 | 1442 | static void cp_parser_using_directive |
94edc4ab | 1443 | (cp_parser *); |
a723baf1 | 1444 | static void cp_parser_asm_definition |
94edc4ab | 1445 | (cp_parser *); |
a723baf1 | 1446 | static void cp_parser_linkage_specification |
94edc4ab | 1447 | (cp_parser *); |
a723baf1 MM |
1448 | |
1449 | /* Declarators [gram.dcl.decl] */ | |
1450 | ||
1451 | static tree cp_parser_init_declarator | |
94edc4ab | 1452 | (cp_parser *, tree, tree, bool, bool, bool *); |
a723baf1 | 1453 | static tree cp_parser_declarator |
7efa3e22 | 1454 | (cp_parser *, cp_parser_declarator_kind, int *); |
a723baf1 | 1455 | static tree cp_parser_direct_declarator |
7efa3e22 | 1456 | (cp_parser *, cp_parser_declarator_kind, int *); |
a723baf1 | 1457 | static enum tree_code cp_parser_ptr_operator |
94edc4ab | 1458 | (cp_parser *, tree *, tree *); |
a723baf1 | 1459 | static tree cp_parser_cv_qualifier_seq_opt |
94edc4ab | 1460 | (cp_parser *); |
a723baf1 | 1461 | static tree cp_parser_cv_qualifier_opt |
94edc4ab | 1462 | (cp_parser *); |
a723baf1 | 1463 | static tree cp_parser_declarator_id |
94edc4ab | 1464 | (cp_parser *); |
a723baf1 | 1465 | static tree cp_parser_type_id |
94edc4ab | 1466 | (cp_parser *); |
a723baf1 | 1467 | static tree cp_parser_type_specifier_seq |
94edc4ab | 1468 | (cp_parser *); |
a723baf1 | 1469 | static tree cp_parser_parameter_declaration_clause |
94edc4ab | 1470 | (cp_parser *); |
a723baf1 | 1471 | static tree cp_parser_parameter_declaration_list |
94edc4ab | 1472 | (cp_parser *); |
a723baf1 | 1473 | static tree cp_parser_parameter_declaration |
94edc4ab | 1474 | (cp_parser *, bool); |
a723baf1 | 1475 | static tree cp_parser_function_definition |
94edc4ab | 1476 | (cp_parser *, bool *); |
a723baf1 MM |
1477 | static void cp_parser_function_body |
1478 | (cp_parser *); | |
1479 | static tree cp_parser_initializer | |
39703eb9 | 1480 | (cp_parser *, bool *, bool *); |
a723baf1 | 1481 | static tree cp_parser_initializer_clause |
39703eb9 | 1482 | (cp_parser *, bool *); |
a723baf1 | 1483 | static tree cp_parser_initializer_list |
39703eb9 | 1484 | (cp_parser *, bool *); |
a723baf1 MM |
1485 | |
1486 | static bool cp_parser_ctor_initializer_opt_and_function_body | |
1487 | (cp_parser *); | |
1488 | ||
1489 | /* Classes [gram.class] */ | |
1490 | ||
1491 | static tree cp_parser_class_name | |
8d241e0b | 1492 | (cp_parser *, bool, bool, bool, bool, bool); |
a723baf1 | 1493 | static tree cp_parser_class_specifier |
94edc4ab | 1494 | (cp_parser *); |
a723baf1 | 1495 | static tree cp_parser_class_head |
94edc4ab | 1496 | (cp_parser *, bool *); |
a723baf1 | 1497 | static enum tag_types cp_parser_class_key |
94edc4ab | 1498 | (cp_parser *); |
a723baf1 | 1499 | static void cp_parser_member_specification_opt |
94edc4ab | 1500 | (cp_parser *); |
a723baf1 | 1501 | static void cp_parser_member_declaration |
94edc4ab | 1502 | (cp_parser *); |
a723baf1 | 1503 | static tree cp_parser_pure_specifier |
94edc4ab | 1504 | (cp_parser *); |
a723baf1 | 1505 | static tree cp_parser_constant_initializer |
94edc4ab | 1506 | (cp_parser *); |
a723baf1 MM |
1507 | |
1508 | /* Derived classes [gram.class.derived] */ | |
1509 | ||
1510 | static tree cp_parser_base_clause | |
94edc4ab | 1511 | (cp_parser *); |
a723baf1 | 1512 | static tree cp_parser_base_specifier |
94edc4ab | 1513 | (cp_parser *); |
a723baf1 MM |
1514 | |
1515 | /* Special member functions [gram.special] */ | |
1516 | ||
1517 | static tree cp_parser_conversion_function_id | |
94edc4ab | 1518 | (cp_parser *); |
a723baf1 | 1519 | static tree cp_parser_conversion_type_id |
94edc4ab | 1520 | (cp_parser *); |
a723baf1 | 1521 | static tree cp_parser_conversion_declarator_opt |
94edc4ab | 1522 | (cp_parser *); |
a723baf1 | 1523 | static bool cp_parser_ctor_initializer_opt |
94edc4ab | 1524 | (cp_parser *); |
a723baf1 | 1525 | static void cp_parser_mem_initializer_list |
94edc4ab | 1526 | (cp_parser *); |
a723baf1 | 1527 | static tree cp_parser_mem_initializer |
94edc4ab | 1528 | (cp_parser *); |
a723baf1 | 1529 | static tree cp_parser_mem_initializer_id |
94edc4ab | 1530 | (cp_parser *); |
a723baf1 MM |
1531 | |
1532 | /* Overloading [gram.over] */ | |
1533 | ||
1534 | static tree cp_parser_operator_function_id | |
94edc4ab | 1535 | (cp_parser *); |
a723baf1 | 1536 | static tree cp_parser_operator |
94edc4ab | 1537 | (cp_parser *); |
a723baf1 MM |
1538 | |
1539 | /* Templates [gram.temp] */ | |
1540 | ||
1541 | static void cp_parser_template_declaration | |
94edc4ab | 1542 | (cp_parser *, bool); |
a723baf1 | 1543 | static tree cp_parser_template_parameter_list |
94edc4ab | 1544 | (cp_parser *); |
a723baf1 | 1545 | static tree cp_parser_template_parameter |
94edc4ab | 1546 | (cp_parser *); |
a723baf1 | 1547 | static tree cp_parser_type_parameter |
94edc4ab | 1548 | (cp_parser *); |
a723baf1 | 1549 | static tree cp_parser_template_id |
94edc4ab | 1550 | (cp_parser *, bool, bool); |
a723baf1 | 1551 | static tree cp_parser_template_name |
94edc4ab | 1552 | (cp_parser *, bool, bool); |
a723baf1 | 1553 | static tree cp_parser_template_argument_list |
94edc4ab | 1554 | (cp_parser *); |
a723baf1 | 1555 | static tree cp_parser_template_argument |
94edc4ab | 1556 | (cp_parser *); |
a723baf1 | 1557 | static void cp_parser_explicit_instantiation |
94edc4ab | 1558 | (cp_parser *); |
a723baf1 | 1559 | static void cp_parser_explicit_specialization |
94edc4ab | 1560 | (cp_parser *); |
a723baf1 MM |
1561 | |
1562 | /* Exception handling [gram.exception] */ | |
1563 | ||
1564 | static tree cp_parser_try_block | |
94edc4ab | 1565 | (cp_parser *); |
a723baf1 | 1566 | static bool cp_parser_function_try_block |
94edc4ab | 1567 | (cp_parser *); |
a723baf1 | 1568 | static void cp_parser_handler_seq |
94edc4ab | 1569 | (cp_parser *); |
a723baf1 | 1570 | static void cp_parser_handler |
94edc4ab | 1571 | (cp_parser *); |
a723baf1 | 1572 | static tree cp_parser_exception_declaration |
94edc4ab | 1573 | (cp_parser *); |
a723baf1 | 1574 | static tree cp_parser_throw_expression |
94edc4ab | 1575 | (cp_parser *); |
a723baf1 | 1576 | static tree cp_parser_exception_specification_opt |
94edc4ab | 1577 | (cp_parser *); |
a723baf1 | 1578 | static tree cp_parser_type_id_list |
94edc4ab | 1579 | (cp_parser *); |
a723baf1 MM |
1580 | |
1581 | /* GNU Extensions */ | |
1582 | ||
1583 | static tree cp_parser_asm_specification_opt | |
94edc4ab | 1584 | (cp_parser *); |
a723baf1 | 1585 | static tree cp_parser_asm_operand_list |
94edc4ab | 1586 | (cp_parser *); |
a723baf1 | 1587 | static tree cp_parser_asm_clobber_list |
94edc4ab | 1588 | (cp_parser *); |
a723baf1 | 1589 | static tree cp_parser_attributes_opt |
94edc4ab | 1590 | (cp_parser *); |
a723baf1 | 1591 | static tree cp_parser_attribute_list |
94edc4ab | 1592 | (cp_parser *); |
a723baf1 | 1593 | static bool cp_parser_extension_opt |
94edc4ab | 1594 | (cp_parser *, int *); |
a723baf1 | 1595 | static void cp_parser_label_declaration |
94edc4ab | 1596 | (cp_parser *); |
a723baf1 MM |
1597 | |
1598 | /* Utility Routines */ | |
1599 | ||
1600 | static tree cp_parser_lookup_name | |
8d241e0b | 1601 | (cp_parser *, tree, bool, bool, bool); |
a723baf1 | 1602 | static tree cp_parser_lookup_name_simple |
94edc4ab | 1603 | (cp_parser *, tree); |
a723baf1 MM |
1604 | static tree cp_parser_maybe_treat_template_as_class |
1605 | (tree, bool); | |
1606 | static bool cp_parser_check_declarator_template_parameters | |
94edc4ab | 1607 | (cp_parser *, tree); |
a723baf1 | 1608 | static bool cp_parser_check_template_parameters |
94edc4ab | 1609 | (cp_parser *, unsigned); |
d6b4ea85 MM |
1610 | static tree cp_parser_simple_cast_expression |
1611 | (cp_parser *); | |
a723baf1 | 1612 | static tree cp_parser_binary_expression |
94edc4ab | 1613 | (cp_parser *, const cp_parser_token_tree_map, cp_parser_expression_fn); |
a723baf1 | 1614 | static tree cp_parser_global_scope_opt |
94edc4ab | 1615 | (cp_parser *, bool); |
a723baf1 MM |
1616 | static bool cp_parser_constructor_declarator_p |
1617 | (cp_parser *, bool); | |
1618 | static tree cp_parser_function_definition_from_specifiers_and_declarator | |
94edc4ab | 1619 | (cp_parser *, tree, tree, tree); |
a723baf1 | 1620 | static tree cp_parser_function_definition_after_declarator |
94edc4ab | 1621 | (cp_parser *, bool); |
a723baf1 | 1622 | static void cp_parser_template_declaration_after_export |
94edc4ab | 1623 | (cp_parser *, bool); |
a723baf1 | 1624 | static tree cp_parser_single_declaration |
94edc4ab | 1625 | (cp_parser *, bool, bool *); |
a723baf1 | 1626 | static tree cp_parser_functional_cast |
94edc4ab | 1627 | (cp_parser *, tree); |
8db1028e NS |
1628 | static void cp_parser_save_default_args |
1629 | (cp_parser *, tree); | |
a723baf1 | 1630 | static void cp_parser_late_parsing_for_member |
94edc4ab | 1631 | (cp_parser *, tree); |
a723baf1 | 1632 | static void cp_parser_late_parsing_default_args |
8218bd34 | 1633 | (cp_parser *, tree); |
a723baf1 | 1634 | static tree cp_parser_sizeof_operand |
94edc4ab | 1635 | (cp_parser *, enum rid); |
a723baf1 | 1636 | static bool cp_parser_declares_only_class_p |
94edc4ab | 1637 | (cp_parser *); |
d17811fd MM |
1638 | static tree cp_parser_fold_non_dependent_expr |
1639 | (tree); | |
a723baf1 | 1640 | static bool cp_parser_friend_p |
94edc4ab | 1641 | (tree); |
a723baf1 | 1642 | static cp_token *cp_parser_require |
94edc4ab | 1643 | (cp_parser *, enum cpp_ttype, const char *); |
a723baf1 | 1644 | static cp_token *cp_parser_require_keyword |
94edc4ab | 1645 | (cp_parser *, enum rid, const char *); |
a723baf1 | 1646 | static bool cp_parser_token_starts_function_definition_p |
94edc4ab | 1647 | (cp_token *); |
a723baf1 MM |
1648 | static bool cp_parser_next_token_starts_class_definition_p |
1649 | (cp_parser *); | |
d17811fd MM |
1650 | static bool cp_parser_next_token_ends_template_argument_p |
1651 | (cp_parser *); | |
a723baf1 | 1652 | static enum tag_types cp_parser_token_is_class_key |
94edc4ab | 1653 | (cp_token *); |
a723baf1 MM |
1654 | static void cp_parser_check_class_key |
1655 | (enum tag_types, tree type); | |
1656 | static bool cp_parser_optional_template_keyword | |
1657 | (cp_parser *); | |
2050a1bb MM |
1658 | static void cp_parser_pre_parsed_nested_name_specifier |
1659 | (cp_parser *); | |
a723baf1 MM |
1660 | static void cp_parser_cache_group |
1661 | (cp_parser *, cp_token_cache *, enum cpp_ttype, unsigned); | |
1662 | static void cp_parser_parse_tentatively | |
94edc4ab | 1663 | (cp_parser *); |
a723baf1 | 1664 | static void cp_parser_commit_to_tentative_parse |
94edc4ab | 1665 | (cp_parser *); |
a723baf1 | 1666 | static void cp_parser_abort_tentative_parse |
94edc4ab | 1667 | (cp_parser *); |
a723baf1 | 1668 | static bool cp_parser_parse_definitely |
94edc4ab | 1669 | (cp_parser *); |
f7b5ecd9 | 1670 | static inline bool cp_parser_parsing_tentatively |
94edc4ab | 1671 | (cp_parser *); |
a723baf1 | 1672 | static bool cp_parser_committed_to_tentative_parse |
94edc4ab | 1673 | (cp_parser *); |
a723baf1 | 1674 | static void cp_parser_error |
94edc4ab | 1675 | (cp_parser *, const char *); |
e5976695 | 1676 | static bool cp_parser_simulate_error |
94edc4ab | 1677 | (cp_parser *); |
a723baf1 | 1678 | static void cp_parser_check_type_definition |
94edc4ab | 1679 | (cp_parser *); |
14d22dd6 MM |
1680 | static tree cp_parser_non_constant_expression |
1681 | (const char *); | |
8fbc5ae7 MM |
1682 | static bool cp_parser_diagnose_invalid_type_name |
1683 | (cp_parser *); | |
7efa3e22 NS |
1684 | static int cp_parser_skip_to_closing_parenthesis |
1685 | (cp_parser *, bool, bool); | |
a723baf1 | 1686 | static void cp_parser_skip_to_end_of_statement |
94edc4ab | 1687 | (cp_parser *); |
e0860732 MM |
1688 | static void cp_parser_consume_semicolon_at_end_of_statement |
1689 | (cp_parser *); | |
a723baf1 | 1690 | static void cp_parser_skip_to_end_of_block_or_statement |
94edc4ab | 1691 | (cp_parser *); |
a723baf1 MM |
1692 | static void cp_parser_skip_to_closing_brace |
1693 | (cp_parser *); | |
1694 | static void cp_parser_skip_until_found | |
94edc4ab | 1695 | (cp_parser *, enum cpp_ttype, const char *); |
a723baf1 | 1696 | static bool cp_parser_error_occurred |
94edc4ab | 1697 | (cp_parser *); |
a723baf1 | 1698 | static bool cp_parser_allow_gnu_extensions_p |
94edc4ab | 1699 | (cp_parser *); |
a723baf1 | 1700 | static bool cp_parser_is_string_literal |
94edc4ab | 1701 | (cp_token *); |
a723baf1 | 1702 | static bool cp_parser_is_keyword |
94edc4ab | 1703 | (cp_token *, enum rid); |
a723baf1 | 1704 | |
4de8668e | 1705 | /* Returns nonzero if we are parsing tentatively. */ |
f7b5ecd9 MM |
1706 | |
1707 | static inline bool | |
94edc4ab | 1708 | cp_parser_parsing_tentatively (cp_parser* parser) |
f7b5ecd9 MM |
1709 | { |
1710 | return parser->context->next != NULL; | |
1711 | } | |
1712 | ||
4de8668e | 1713 | /* Returns nonzero if TOKEN is a string literal. */ |
a723baf1 MM |
1714 | |
1715 | static bool | |
94edc4ab | 1716 | cp_parser_is_string_literal (cp_token* token) |
a723baf1 MM |
1717 | { |
1718 | return (token->type == CPP_STRING || token->type == CPP_WSTRING); | |
1719 | } | |
1720 | ||
4de8668e | 1721 | /* Returns nonzero if TOKEN is the indicated KEYWORD. */ |
a723baf1 MM |
1722 | |
1723 | static bool | |
94edc4ab | 1724 | cp_parser_is_keyword (cp_token* token, enum rid keyword) |
a723baf1 MM |
1725 | { |
1726 | return token->keyword == keyword; | |
1727 | } | |
1728 | ||
a723baf1 MM |
1729 | /* Issue the indicated error MESSAGE. */ |
1730 | ||
1731 | static void | |
94edc4ab | 1732 | cp_parser_error (cp_parser* parser, const char* message) |
a723baf1 | 1733 | { |
a723baf1 | 1734 | /* Output the MESSAGE -- unless we're parsing tentatively. */ |
e5976695 | 1735 | if (!cp_parser_simulate_error (parser)) |
a723baf1 MM |
1736 | error (message); |
1737 | } | |
1738 | ||
1739 | /* If we are parsing tentatively, remember that an error has occurred | |
e5976695 MM |
1740 | during this tentative parse. Returns true if the error was |
1741 | simulated; false if a messgae should be issued by the caller. */ | |
a723baf1 | 1742 | |
e5976695 | 1743 | static bool |
94edc4ab | 1744 | cp_parser_simulate_error (cp_parser* parser) |
a723baf1 MM |
1745 | { |
1746 | if (cp_parser_parsing_tentatively (parser) | |
1747 | && !cp_parser_committed_to_tentative_parse (parser)) | |
e5976695 MM |
1748 | { |
1749 | parser->context->status = CP_PARSER_STATUS_KIND_ERROR; | |
1750 | return true; | |
1751 | } | |
1752 | return false; | |
a723baf1 MM |
1753 | } |
1754 | ||
1755 | /* This function is called when a type is defined. If type | |
1756 | definitions are forbidden at this point, an error message is | |
1757 | issued. */ | |
1758 | ||
1759 | static void | |
94edc4ab | 1760 | cp_parser_check_type_definition (cp_parser* parser) |
a723baf1 MM |
1761 | { |
1762 | /* If types are forbidden here, issue a message. */ | |
1763 | if (parser->type_definition_forbidden_message) | |
1764 | /* Use `%s' to print the string in case there are any escape | |
1765 | characters in the message. */ | |
1766 | error ("%s", parser->type_definition_forbidden_message); | |
1767 | } | |
1768 | ||
14d22dd6 MM |
1769 | /* Issue an eror message about the fact that THING appeared in a |
1770 | constant-expression. Returns ERROR_MARK_NODE. */ | |
1771 | ||
1772 | static tree | |
1773 | cp_parser_non_constant_expression (const char *thing) | |
1774 | { | |
1775 | error ("%s cannot appear in a constant-expression", thing); | |
1776 | return error_mark_node; | |
1777 | } | |
1778 | ||
8fbc5ae7 MM |
1779 | /* Check for a common situation where a type-name should be present, |
1780 | but is not, and issue a sensible error message. Returns true if an | |
1781 | invalid type-name was detected. */ | |
1782 | ||
1783 | static bool | |
1784 | cp_parser_diagnose_invalid_type_name (cp_parser *parser) | |
1785 | { | |
1786 | /* If the next two tokens are both identifiers, the code is | |
1787 | erroneous. The usual cause of this situation is code like: | |
1788 | ||
1789 | T t; | |
1790 | ||
1791 | where "T" should name a type -- but does not. */ | |
1792 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME) | |
1793 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type == CPP_NAME) | |
1794 | { | |
1795 | tree name; | |
1796 | ||
8d241e0b | 1797 | /* If parsing tentatively, we should commit; we really are |
8fbc5ae7 MM |
1798 | looking at a declaration. */ |
1799 | /* Consume the first identifier. */ | |
1800 | name = cp_lexer_consume_token (parser->lexer)->value; | |
1801 | /* Issue an error message. */ | |
1802 | error ("`%s' does not name a type", IDENTIFIER_POINTER (name)); | |
1803 | /* If we're in a template class, it's possible that the user was | |
1804 | referring to a type from a base class. For example: | |
1805 | ||
1806 | template <typename T> struct A { typedef T X; }; | |
1807 | template <typename T> struct B : public A<T> { X x; }; | |
1808 | ||
1809 | The user should have said "typename A<T>::X". */ | |
1810 | if (processing_template_decl && current_class_type) | |
1811 | { | |
1812 | tree b; | |
1813 | ||
1814 | for (b = TREE_CHAIN (TYPE_BINFO (current_class_type)); | |
1815 | b; | |
1816 | b = TREE_CHAIN (b)) | |
1817 | { | |
1818 | tree base_type = BINFO_TYPE (b); | |
1819 | if (CLASS_TYPE_P (base_type) | |
1fb3244a | 1820 | && dependent_type_p (base_type)) |
8fbc5ae7 MM |
1821 | { |
1822 | tree field; | |
1823 | /* Go from a particular instantiation of the | |
1824 | template (which will have an empty TYPE_FIELDs), | |
1825 | to the main version. */ | |
353b4fc0 | 1826 | base_type = CLASSTYPE_PRIMARY_TEMPLATE_TYPE (base_type); |
8fbc5ae7 MM |
1827 | for (field = TYPE_FIELDS (base_type); |
1828 | field; | |
1829 | field = TREE_CHAIN (field)) | |
1830 | if (TREE_CODE (field) == TYPE_DECL | |
1831 | && DECL_NAME (field) == name) | |
1832 | { | |
1833 | error ("(perhaps `typename %T::%s' was intended)", | |
1834 | BINFO_TYPE (b), IDENTIFIER_POINTER (name)); | |
1835 | break; | |
1836 | } | |
1837 | if (field) | |
1838 | break; | |
1839 | } | |
1840 | } | |
1841 | } | |
1842 | /* Skip to the end of the declaration; there's no point in | |
1843 | trying to process it. */ | |
1844 | cp_parser_skip_to_end_of_statement (parser); | |
1845 | ||
1846 | return true; | |
1847 | } | |
1848 | ||
1849 | return false; | |
1850 | } | |
1851 | ||
a723baf1 | 1852 | /* Consume tokens up to, and including, the next non-nested closing `)'. |
7efa3e22 NS |
1853 | Returns 1 iff we found a closing `)'. RECOVERING is true, if we |
1854 | are doing error recovery. Returns -1 if OR_COMMA is true and we | |
1855 | found an unnested comma. */ | |
a723baf1 | 1856 | |
7efa3e22 NS |
1857 | static int |
1858 | cp_parser_skip_to_closing_parenthesis (cp_parser *parser, | |
1859 | bool recovering, bool or_comma) | |
a723baf1 | 1860 | { |
7efa3e22 NS |
1861 | unsigned paren_depth = 0; |
1862 | unsigned brace_depth = 0; | |
a723baf1 | 1863 | |
7efa3e22 NS |
1864 | if (recovering && !or_comma && cp_parser_parsing_tentatively (parser) |
1865 | && !cp_parser_committed_to_tentative_parse (parser)) | |
1866 | return 0; | |
1867 | ||
a723baf1 MM |
1868 | while (true) |
1869 | { | |
1870 | cp_token *token; | |
7efa3e22 | 1871 | |
a723baf1 MM |
1872 | /* If we've run out of tokens, then there is no closing `)'. */ |
1873 | if (cp_lexer_next_token_is (parser->lexer, CPP_EOF)) | |
7efa3e22 | 1874 | return 0; |
a723baf1 | 1875 | |
7efa3e22 NS |
1876 | if (recovering) |
1877 | { | |
1878 | token = cp_lexer_peek_token (parser->lexer); | |
a723baf1 | 1879 | |
7efa3e22 NS |
1880 | /* This matches the processing in skip_to_end_of_statement */ |
1881 | if (token->type == CPP_SEMICOLON && !brace_depth) | |
1882 | return 0; | |
1883 | if (token->type == CPP_OPEN_BRACE) | |
1884 | ++brace_depth; | |
1885 | if (token->type == CPP_CLOSE_BRACE) | |
1886 | { | |
1887 | if (!brace_depth--) | |
1888 | return 0; | |
1889 | } | |
1890 | if (or_comma && token->type == CPP_COMMA | |
1891 | && !brace_depth && !paren_depth) | |
1892 | return -1; | |
1893 | } | |
1894 | ||
a723baf1 MM |
1895 | /* Consume the token. */ |
1896 | token = cp_lexer_consume_token (parser->lexer); | |
7efa3e22 NS |
1897 | |
1898 | if (!brace_depth) | |
1899 | { | |
1900 | /* If it is an `(', we have entered another level of nesting. */ | |
1901 | if (token->type == CPP_OPEN_PAREN) | |
1902 | ++paren_depth; | |
1903 | /* If it is a `)', then we might be done. */ | |
1904 | else if (token->type == CPP_CLOSE_PAREN && !paren_depth--) | |
1905 | return 1; | |
1906 | } | |
a723baf1 MM |
1907 | } |
1908 | } | |
1909 | ||
1910 | /* Consume tokens until we reach the end of the current statement. | |
1911 | Normally, that will be just before consuming a `;'. However, if a | |
1912 | non-nested `}' comes first, then we stop before consuming that. */ | |
1913 | ||
1914 | static void | |
94edc4ab | 1915 | cp_parser_skip_to_end_of_statement (cp_parser* parser) |
a723baf1 MM |
1916 | { |
1917 | unsigned nesting_depth = 0; | |
1918 | ||
1919 | while (true) | |
1920 | { | |
1921 | cp_token *token; | |
1922 | ||
1923 | /* Peek at the next token. */ | |
1924 | token = cp_lexer_peek_token (parser->lexer); | |
1925 | /* If we've run out of tokens, stop. */ | |
1926 | if (token->type == CPP_EOF) | |
1927 | break; | |
1928 | /* If the next token is a `;', we have reached the end of the | |
1929 | statement. */ | |
1930 | if (token->type == CPP_SEMICOLON && !nesting_depth) | |
1931 | break; | |
1932 | /* If the next token is a non-nested `}', then we have reached | |
1933 | the end of the current block. */ | |
1934 | if (token->type == CPP_CLOSE_BRACE) | |
1935 | { | |
1936 | /* If this is a non-nested `}', stop before consuming it. | |
1937 | That way, when confronted with something like: | |
1938 | ||
1939 | { 3 + } | |
1940 | ||
1941 | we stop before consuming the closing `}', even though we | |
1942 | have not yet reached a `;'. */ | |
1943 | if (nesting_depth == 0) | |
1944 | break; | |
1945 | /* If it is the closing `}' for a block that we have | |
1946 | scanned, stop -- but only after consuming the token. | |
1947 | That way given: | |
1948 | ||
1949 | void f g () { ... } | |
1950 | typedef int I; | |
1951 | ||
1952 | we will stop after the body of the erroneously declared | |
1953 | function, but before consuming the following `typedef' | |
1954 | declaration. */ | |
1955 | if (--nesting_depth == 0) | |
1956 | { | |
1957 | cp_lexer_consume_token (parser->lexer); | |
1958 | break; | |
1959 | } | |
1960 | } | |
1961 | /* If it the next token is a `{', then we are entering a new | |
1962 | block. Consume the entire block. */ | |
1963 | else if (token->type == CPP_OPEN_BRACE) | |
1964 | ++nesting_depth; | |
1965 | /* Consume the token. */ | |
1966 | cp_lexer_consume_token (parser->lexer); | |
1967 | } | |
1968 | } | |
1969 | ||
e0860732 MM |
1970 | /* This function is called at the end of a statement or declaration. |
1971 | If the next token is a semicolon, it is consumed; otherwise, error | |
1972 | recovery is attempted. */ | |
1973 | ||
1974 | static void | |
1975 | cp_parser_consume_semicolon_at_end_of_statement (cp_parser *parser) | |
1976 | { | |
1977 | /* Look for the trailing `;'. */ | |
1978 | if (!cp_parser_require (parser, CPP_SEMICOLON, "`;'")) | |
1979 | { | |
1980 | /* If there is additional (erroneous) input, skip to the end of | |
1981 | the statement. */ | |
1982 | cp_parser_skip_to_end_of_statement (parser); | |
1983 | /* If the next token is now a `;', consume it. */ | |
1984 | if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
1985 | cp_lexer_consume_token (parser->lexer); | |
1986 | } | |
1987 | } | |
1988 | ||
a723baf1 MM |
1989 | /* Skip tokens until we have consumed an entire block, or until we |
1990 | have consumed a non-nested `;'. */ | |
1991 | ||
1992 | static void | |
94edc4ab | 1993 | cp_parser_skip_to_end_of_block_or_statement (cp_parser* parser) |
a723baf1 MM |
1994 | { |
1995 | unsigned nesting_depth = 0; | |
1996 | ||
1997 | while (true) | |
1998 | { | |
1999 | cp_token *token; | |
2000 | ||
2001 | /* Peek at the next token. */ | |
2002 | token = cp_lexer_peek_token (parser->lexer); | |
2003 | /* If we've run out of tokens, stop. */ | |
2004 | if (token->type == CPP_EOF) | |
2005 | break; | |
2006 | /* If the next token is a `;', we have reached the end of the | |
2007 | statement. */ | |
2008 | if (token->type == CPP_SEMICOLON && !nesting_depth) | |
2009 | { | |
2010 | /* Consume the `;'. */ | |
2011 | cp_lexer_consume_token (parser->lexer); | |
2012 | break; | |
2013 | } | |
2014 | /* Consume the token. */ | |
2015 | token = cp_lexer_consume_token (parser->lexer); | |
2016 | /* If the next token is a non-nested `}', then we have reached | |
2017 | the end of the current block. */ | |
2018 | if (token->type == CPP_CLOSE_BRACE | |
2019 | && (nesting_depth == 0 || --nesting_depth == 0)) | |
2020 | break; | |
2021 | /* If it the next token is a `{', then we are entering a new | |
2022 | block. Consume the entire block. */ | |
2023 | if (token->type == CPP_OPEN_BRACE) | |
2024 | ++nesting_depth; | |
2025 | } | |
2026 | } | |
2027 | ||
2028 | /* Skip tokens until a non-nested closing curly brace is the next | |
2029 | token. */ | |
2030 | ||
2031 | static void | |
2032 | cp_parser_skip_to_closing_brace (cp_parser *parser) | |
2033 | { | |
2034 | unsigned nesting_depth = 0; | |
2035 | ||
2036 | while (true) | |
2037 | { | |
2038 | cp_token *token; | |
2039 | ||
2040 | /* Peek at the next token. */ | |
2041 | token = cp_lexer_peek_token (parser->lexer); | |
2042 | /* If we've run out of tokens, stop. */ | |
2043 | if (token->type == CPP_EOF) | |
2044 | break; | |
2045 | /* If the next token is a non-nested `}', then we have reached | |
2046 | the end of the current block. */ | |
2047 | if (token->type == CPP_CLOSE_BRACE && nesting_depth-- == 0) | |
2048 | break; | |
2049 | /* If it the next token is a `{', then we are entering a new | |
2050 | block. Consume the entire block. */ | |
2051 | else if (token->type == CPP_OPEN_BRACE) | |
2052 | ++nesting_depth; | |
2053 | /* Consume the token. */ | |
2054 | cp_lexer_consume_token (parser->lexer); | |
2055 | } | |
2056 | } | |
2057 | ||
2058 | /* Create a new C++ parser. */ | |
2059 | ||
2060 | static cp_parser * | |
94edc4ab | 2061 | cp_parser_new (void) |
a723baf1 MM |
2062 | { |
2063 | cp_parser *parser; | |
17211ab5 GK |
2064 | cp_lexer *lexer; |
2065 | ||
2066 | /* cp_lexer_new_main is called before calling ggc_alloc because | |
2067 | cp_lexer_new_main might load a PCH file. */ | |
2068 | lexer = cp_lexer_new_main (); | |
a723baf1 MM |
2069 | |
2070 | parser = (cp_parser *) ggc_alloc_cleared (sizeof (cp_parser)); | |
17211ab5 | 2071 | parser->lexer = lexer; |
a723baf1 MM |
2072 | parser->context = cp_parser_context_new (NULL); |
2073 | ||
2074 | /* For now, we always accept GNU extensions. */ | |
2075 | parser->allow_gnu_extensions_p = 1; | |
2076 | ||
2077 | /* The `>' token is a greater-than operator, not the end of a | |
2078 | template-id. */ | |
2079 | parser->greater_than_is_operator_p = true; | |
2080 | ||
2081 | parser->default_arg_ok_p = true; | |
2082 | ||
2083 | /* We are not parsing a constant-expression. */ | |
2084 | parser->constant_expression_p = false; | |
14d22dd6 MM |
2085 | parser->allow_non_constant_expression_p = false; |
2086 | parser->non_constant_expression_p = false; | |
a723baf1 MM |
2087 | |
2088 | /* Local variable names are not forbidden. */ | |
2089 | parser->local_variables_forbidden_p = false; | |
2090 | ||
34cd5ae7 | 2091 | /* We are not processing an `extern "C"' declaration. */ |
a723baf1 MM |
2092 | parser->in_unbraced_linkage_specification_p = false; |
2093 | ||
2094 | /* We are not processing a declarator. */ | |
2095 | parser->in_declarator_p = false; | |
2096 | ||
a723baf1 MM |
2097 | /* The unparsed function queue is empty. */ |
2098 | parser->unparsed_functions_queues = build_tree_list (NULL_TREE, NULL_TREE); | |
2099 | ||
2100 | /* There are no classes being defined. */ | |
2101 | parser->num_classes_being_defined = 0; | |
2102 | ||
2103 | /* No template parameters apply. */ | |
2104 | parser->num_template_parameter_lists = 0; | |
2105 | ||
2106 | return parser; | |
2107 | } | |
2108 | ||
2109 | /* Lexical conventions [gram.lex] */ | |
2110 | ||
2111 | /* Parse an identifier. Returns an IDENTIFIER_NODE representing the | |
2112 | identifier. */ | |
2113 | ||
2114 | static tree | |
94edc4ab | 2115 | cp_parser_identifier (cp_parser* parser) |
a723baf1 MM |
2116 | { |
2117 | cp_token *token; | |
2118 | ||
2119 | /* Look for the identifier. */ | |
2120 | token = cp_parser_require (parser, CPP_NAME, "identifier"); | |
2121 | /* Return the value. */ | |
2122 | return token ? token->value : error_mark_node; | |
2123 | } | |
2124 | ||
2125 | /* Basic concepts [gram.basic] */ | |
2126 | ||
2127 | /* Parse a translation-unit. | |
2128 | ||
2129 | translation-unit: | |
2130 | declaration-seq [opt] | |
2131 | ||
2132 | Returns TRUE if all went well. */ | |
2133 | ||
2134 | static bool | |
94edc4ab | 2135 | cp_parser_translation_unit (cp_parser* parser) |
a723baf1 MM |
2136 | { |
2137 | while (true) | |
2138 | { | |
2139 | cp_parser_declaration_seq_opt (parser); | |
2140 | ||
2141 | /* If there are no tokens left then all went well. */ | |
2142 | if (cp_lexer_next_token_is (parser->lexer, CPP_EOF)) | |
2143 | break; | |
2144 | ||
2145 | /* Otherwise, issue an error message. */ | |
2146 | cp_parser_error (parser, "expected declaration"); | |
2147 | return false; | |
2148 | } | |
2149 | ||
2150 | /* Consume the EOF token. */ | |
2151 | cp_parser_require (parser, CPP_EOF, "end-of-file"); | |
2152 | ||
2153 | /* Finish up. */ | |
2154 | finish_translation_unit (); | |
2155 | ||
2156 | /* All went well. */ | |
2157 | return true; | |
2158 | } | |
2159 | ||
2160 | /* Expressions [gram.expr] */ | |
2161 | ||
2162 | /* Parse a primary-expression. | |
2163 | ||
2164 | primary-expression: | |
2165 | literal | |
2166 | this | |
2167 | ( expression ) | |
2168 | id-expression | |
2169 | ||
2170 | GNU Extensions: | |
2171 | ||
2172 | primary-expression: | |
2173 | ( compound-statement ) | |
2174 | __builtin_va_arg ( assignment-expression , type-id ) | |
2175 | ||
2176 | literal: | |
2177 | __null | |
2178 | ||
2179 | Returns a representation of the expression. | |
2180 | ||
2181 | *IDK indicates what kind of id-expression (if any) was present. | |
2182 | ||
2183 | *QUALIFYING_CLASS is set to a non-NULL value if the id-expression can be | |
2184 | used as the operand of a pointer-to-member. In that case, | |
2185 | *QUALIFYING_CLASS gives the class that is used as the qualifying | |
2186 | class in the pointer-to-member. */ | |
2187 | ||
2188 | static tree | |
2189 | cp_parser_primary_expression (cp_parser *parser, | |
b3445994 | 2190 | cp_id_kind *idk, |
a723baf1 MM |
2191 | tree *qualifying_class) |
2192 | { | |
2193 | cp_token *token; | |
2194 | ||
2195 | /* Assume the primary expression is not an id-expression. */ | |
b3445994 | 2196 | *idk = CP_ID_KIND_NONE; |
a723baf1 MM |
2197 | /* And that it cannot be used as pointer-to-member. */ |
2198 | *qualifying_class = NULL_TREE; | |
2199 | ||
2200 | /* Peek at the next token. */ | |
2201 | token = cp_lexer_peek_token (parser->lexer); | |
2202 | switch (token->type) | |
2203 | { | |
2204 | /* literal: | |
2205 | integer-literal | |
2206 | character-literal | |
2207 | floating-literal | |
2208 | string-literal | |
2209 | boolean-literal */ | |
2210 | case CPP_CHAR: | |
2211 | case CPP_WCHAR: | |
2212 | case CPP_STRING: | |
2213 | case CPP_WSTRING: | |
2214 | case CPP_NUMBER: | |
2215 | token = cp_lexer_consume_token (parser->lexer); | |
2216 | return token->value; | |
2217 | ||
2218 | case CPP_OPEN_PAREN: | |
2219 | { | |
2220 | tree expr; | |
2221 | bool saved_greater_than_is_operator_p; | |
2222 | ||
2223 | /* Consume the `('. */ | |
2224 | cp_lexer_consume_token (parser->lexer); | |
2225 | /* Within a parenthesized expression, a `>' token is always | |
2226 | the greater-than operator. */ | |
2227 | saved_greater_than_is_operator_p | |
2228 | = parser->greater_than_is_operator_p; | |
2229 | parser->greater_than_is_operator_p = true; | |
2230 | /* If we see `( { ' then we are looking at the beginning of | |
2231 | a GNU statement-expression. */ | |
2232 | if (cp_parser_allow_gnu_extensions_p (parser) | |
2233 | && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)) | |
2234 | { | |
2235 | /* Statement-expressions are not allowed by the standard. */ | |
2236 | if (pedantic) | |
2237 | pedwarn ("ISO C++ forbids braced-groups within expressions"); | |
2238 | ||
2239 | /* And they're not allowed outside of a function-body; you | |
2240 | cannot, for example, write: | |
2241 | ||
2242 | int i = ({ int j = 3; j + 1; }); | |
2243 | ||
2244 | at class or namespace scope. */ | |
2245 | if (!at_function_scope_p ()) | |
2246 | error ("statement-expressions are allowed only inside functions"); | |
2247 | /* Start the statement-expression. */ | |
2248 | expr = begin_stmt_expr (); | |
2249 | /* Parse the compound-statement. */ | |
2250 | cp_parser_compound_statement (parser); | |
2251 | /* Finish up. */ | |
2252 | expr = finish_stmt_expr (expr); | |
2253 | } | |
2254 | else | |
2255 | { | |
2256 | /* Parse the parenthesized expression. */ | |
2257 | expr = cp_parser_expression (parser); | |
2258 | /* Let the front end know that this expression was | |
2259 | enclosed in parentheses. This matters in case, for | |
2260 | example, the expression is of the form `A::B', since | |
2261 | `&A::B' might be a pointer-to-member, but `&(A::B)' is | |
2262 | not. */ | |
2263 | finish_parenthesized_expr (expr); | |
2264 | } | |
2265 | /* The `>' token might be the end of a template-id or | |
2266 | template-parameter-list now. */ | |
2267 | parser->greater_than_is_operator_p | |
2268 | = saved_greater_than_is_operator_p; | |
2269 | /* Consume the `)'. */ | |
2270 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
2271 | cp_parser_skip_to_end_of_statement (parser); | |
2272 | ||
2273 | return expr; | |
2274 | } | |
2275 | ||
2276 | case CPP_KEYWORD: | |
2277 | switch (token->keyword) | |
2278 | { | |
2279 | /* These two are the boolean literals. */ | |
2280 | case RID_TRUE: | |
2281 | cp_lexer_consume_token (parser->lexer); | |
2282 | return boolean_true_node; | |
2283 | case RID_FALSE: | |
2284 | cp_lexer_consume_token (parser->lexer); | |
2285 | return boolean_false_node; | |
2286 | ||
2287 | /* The `__null' literal. */ | |
2288 | case RID_NULL: | |
2289 | cp_lexer_consume_token (parser->lexer); | |
2290 | return null_node; | |
2291 | ||
2292 | /* Recognize the `this' keyword. */ | |
2293 | case RID_THIS: | |
2294 | cp_lexer_consume_token (parser->lexer); | |
2295 | if (parser->local_variables_forbidden_p) | |
2296 | { | |
2297 | error ("`this' may not be used in this context"); | |
2298 | return error_mark_node; | |
2299 | } | |
14d22dd6 MM |
2300 | /* Pointers cannot appear in constant-expressions. */ |
2301 | if (parser->constant_expression_p) | |
2302 | { | |
2303 | if (!parser->allow_non_constant_expression_p) | |
2304 | return cp_parser_non_constant_expression ("`this'"); | |
2305 | parser->non_constant_expression_p = true; | |
2306 | } | |
a723baf1 MM |
2307 | return finish_this_expr (); |
2308 | ||
2309 | /* The `operator' keyword can be the beginning of an | |
2310 | id-expression. */ | |
2311 | case RID_OPERATOR: | |
2312 | goto id_expression; | |
2313 | ||
2314 | case RID_FUNCTION_NAME: | |
2315 | case RID_PRETTY_FUNCTION_NAME: | |
2316 | case RID_C99_FUNCTION_NAME: | |
2317 | /* The symbols __FUNCTION__, __PRETTY_FUNCTION__, and | |
2318 | __func__ are the names of variables -- but they are | |
2319 | treated specially. Therefore, they are handled here, | |
2320 | rather than relying on the generic id-expression logic | |
34cd5ae7 | 2321 | below. Grammatically, these names are id-expressions. |
a723baf1 MM |
2322 | |
2323 | Consume the token. */ | |
2324 | token = cp_lexer_consume_token (parser->lexer); | |
2325 | /* Look up the name. */ | |
2326 | return finish_fname (token->value); | |
2327 | ||
2328 | case RID_VA_ARG: | |
2329 | { | |
2330 | tree expression; | |
2331 | tree type; | |
2332 | ||
2333 | /* The `__builtin_va_arg' construct is used to handle | |
2334 | `va_arg'. Consume the `__builtin_va_arg' token. */ | |
2335 | cp_lexer_consume_token (parser->lexer); | |
2336 | /* Look for the opening `('. */ | |
2337 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
2338 | /* Now, parse the assignment-expression. */ | |
2339 | expression = cp_parser_assignment_expression (parser); | |
2340 | /* Look for the `,'. */ | |
2341 | cp_parser_require (parser, CPP_COMMA, "`,'"); | |
2342 | /* Parse the type-id. */ | |
2343 | type = cp_parser_type_id (parser); | |
2344 | /* Look for the closing `)'. */ | |
2345 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
14d22dd6 MM |
2346 | /* Using `va_arg' in a constant-expression is not |
2347 | allowed. */ | |
2348 | if (parser->constant_expression_p) | |
2349 | { | |
2350 | if (!parser->allow_non_constant_expression_p) | |
2351 | return cp_parser_non_constant_expression ("`va_arg'"); | |
2352 | parser->non_constant_expression_p = true; | |
2353 | } | |
a723baf1 MM |
2354 | return build_x_va_arg (expression, type); |
2355 | } | |
2356 | ||
2357 | default: | |
2358 | cp_parser_error (parser, "expected primary-expression"); | |
2359 | return error_mark_node; | |
2360 | } | |
a723baf1 MM |
2361 | |
2362 | /* An id-expression can start with either an identifier, a | |
2363 | `::' as the beginning of a qualified-id, or the "operator" | |
2364 | keyword. */ | |
2365 | case CPP_NAME: | |
2366 | case CPP_SCOPE: | |
2367 | case CPP_TEMPLATE_ID: | |
2368 | case CPP_NESTED_NAME_SPECIFIER: | |
2369 | { | |
2370 | tree id_expression; | |
2371 | tree decl; | |
b3445994 | 2372 | const char *error_msg; |
a723baf1 MM |
2373 | |
2374 | id_expression: | |
2375 | /* Parse the id-expression. */ | |
2376 | id_expression | |
2377 | = cp_parser_id_expression (parser, | |
2378 | /*template_keyword_p=*/false, | |
2379 | /*check_dependency_p=*/true, | |
2380 | /*template_p=*/NULL); | |
2381 | if (id_expression == error_mark_node) | |
2382 | return error_mark_node; | |
2383 | /* If we have a template-id, then no further lookup is | |
2384 | required. If the template-id was for a template-class, we | |
2385 | will sometimes have a TYPE_DECL at this point. */ | |
2386 | else if (TREE_CODE (id_expression) == TEMPLATE_ID_EXPR | |
2387 | || TREE_CODE (id_expression) == TYPE_DECL) | |
2388 | decl = id_expression; | |
2389 | /* Look up the name. */ | |
2390 | else | |
2391 | { | |
2392 | decl = cp_parser_lookup_name_simple (parser, id_expression); | |
2393 | /* If name lookup gives us a SCOPE_REF, then the | |
2394 | qualifying scope was dependent. Just propagate the | |
2395 | name. */ | |
2396 | if (TREE_CODE (decl) == SCOPE_REF) | |
2397 | { | |
2398 | if (TYPE_P (TREE_OPERAND (decl, 0))) | |
2399 | *qualifying_class = TREE_OPERAND (decl, 0); | |
14d22dd6 MM |
2400 | /* Since this name was dependent, the expression isn't |
2401 | constant -- yet. No error is issued because it | |
2402 | might be constant when things are instantiated. */ | |
2403 | if (parser->constant_expression_p) | |
2404 | parser->non_constant_expression_p = true; | |
a723baf1 MM |
2405 | return decl; |
2406 | } | |
2407 | /* Check to see if DECL is a local variable in a context | |
2408 | where that is forbidden. */ | |
2409 | if (parser->local_variables_forbidden_p | |
2410 | && local_variable_p (decl)) | |
2411 | { | |
2412 | /* It might be that we only found DECL because we are | |
2413 | trying to be generous with pre-ISO scoping rules. | |
2414 | For example, consider: | |
2415 | ||
2416 | int i; | |
2417 | void g() { | |
2418 | for (int i = 0; i < 10; ++i) {} | |
2419 | extern void f(int j = i); | |
2420 | } | |
2421 | ||
2422 | Here, name look up will originally find the out | |
2423 | of scope `i'. We need to issue a warning message, | |
2424 | but then use the global `i'. */ | |
2425 | decl = check_for_out_of_scope_variable (decl); | |
2426 | if (local_variable_p (decl)) | |
2427 | { | |
2428 | error ("local variable `%D' may not appear in this context", | |
2429 | decl); | |
2430 | return error_mark_node; | |
2431 | } | |
2432 | } | |
c006d942 | 2433 | } |
b3445994 MM |
2434 | |
2435 | decl = finish_id_expression (id_expression, decl, parser->scope, | |
2436 | idk, qualifying_class, | |
2437 | parser->constant_expression_p, | |
2438 | parser->allow_non_constant_expression_p, | |
2439 | &parser->non_constant_expression_p, | |
2440 | &error_msg); | |
2441 | if (error_msg) | |
2442 | cp_parser_error (parser, error_msg); | |
a723baf1 MM |
2443 | return decl; |
2444 | } | |
2445 | ||
2446 | /* Anything else is an error. */ | |
2447 | default: | |
2448 | cp_parser_error (parser, "expected primary-expression"); | |
2449 | return error_mark_node; | |
2450 | } | |
2451 | } | |
2452 | ||
2453 | /* Parse an id-expression. | |
2454 | ||
2455 | id-expression: | |
2456 | unqualified-id | |
2457 | qualified-id | |
2458 | ||
2459 | qualified-id: | |
2460 | :: [opt] nested-name-specifier template [opt] unqualified-id | |
2461 | :: identifier | |
2462 | :: operator-function-id | |
2463 | :: template-id | |
2464 | ||
2465 | Return a representation of the unqualified portion of the | |
2466 | identifier. Sets PARSER->SCOPE to the qualifying scope if there is | |
2467 | a `::' or nested-name-specifier. | |
2468 | ||
2469 | Often, if the id-expression was a qualified-id, the caller will | |
2470 | want to make a SCOPE_REF to represent the qualified-id. This | |
2471 | function does not do this in order to avoid wastefully creating | |
2472 | SCOPE_REFs when they are not required. | |
2473 | ||
a723baf1 MM |
2474 | If TEMPLATE_KEYWORD_P is true, then we have just seen the |
2475 | `template' keyword. | |
2476 | ||
2477 | If CHECK_DEPENDENCY_P is false, then names are looked up inside | |
2478 | uninstantiated templates. | |
2479 | ||
15d2cb19 | 2480 | If *TEMPLATE_P is non-NULL, it is set to true iff the |
a723baf1 MM |
2481 | `template' keyword is used to explicitly indicate that the entity |
2482 | named is a template. */ | |
2483 | ||
2484 | static tree | |
2485 | cp_parser_id_expression (cp_parser *parser, | |
2486 | bool template_keyword_p, | |
2487 | bool check_dependency_p, | |
2488 | bool *template_p) | |
2489 | { | |
2490 | bool global_scope_p; | |
2491 | bool nested_name_specifier_p; | |
2492 | ||
2493 | /* Assume the `template' keyword was not used. */ | |
2494 | if (template_p) | |
2495 | *template_p = false; | |
2496 | ||
2497 | /* Look for the optional `::' operator. */ | |
2498 | global_scope_p | |
2499 | = (cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false) | |
2500 | != NULL_TREE); | |
2501 | /* Look for the optional nested-name-specifier. */ | |
2502 | nested_name_specifier_p | |
2503 | = (cp_parser_nested_name_specifier_opt (parser, | |
2504 | /*typename_keyword_p=*/false, | |
2505 | check_dependency_p, | |
2506 | /*type_p=*/false) | |
2507 | != NULL_TREE); | |
2508 | /* If there is a nested-name-specifier, then we are looking at | |
2509 | the first qualified-id production. */ | |
2510 | if (nested_name_specifier_p) | |
2511 | { | |
2512 | tree saved_scope; | |
2513 | tree saved_object_scope; | |
2514 | tree saved_qualifying_scope; | |
2515 | tree unqualified_id; | |
2516 | bool is_template; | |
2517 | ||
2518 | /* See if the next token is the `template' keyword. */ | |
2519 | if (!template_p) | |
2520 | template_p = &is_template; | |
2521 | *template_p = cp_parser_optional_template_keyword (parser); | |
2522 | /* Name lookup we do during the processing of the | |
2523 | unqualified-id might obliterate SCOPE. */ | |
2524 | saved_scope = parser->scope; | |
2525 | saved_object_scope = parser->object_scope; | |
2526 | saved_qualifying_scope = parser->qualifying_scope; | |
2527 | /* Process the final unqualified-id. */ | |
2528 | unqualified_id = cp_parser_unqualified_id (parser, *template_p, | |
2529 | check_dependency_p); | |
2530 | /* Restore the SAVED_SCOPE for our caller. */ | |
2531 | parser->scope = saved_scope; | |
2532 | parser->object_scope = saved_object_scope; | |
2533 | parser->qualifying_scope = saved_qualifying_scope; | |
2534 | ||
2535 | return unqualified_id; | |
2536 | } | |
2537 | /* Otherwise, if we are in global scope, then we are looking at one | |
2538 | of the other qualified-id productions. */ | |
2539 | else if (global_scope_p) | |
2540 | { | |
2541 | cp_token *token; | |
2542 | tree id; | |
2543 | ||
e5976695 MM |
2544 | /* Peek at the next token. */ |
2545 | token = cp_lexer_peek_token (parser->lexer); | |
2546 | ||
2547 | /* If it's an identifier, and the next token is not a "<", then | |
2548 | we can avoid the template-id case. This is an optimization | |
2549 | for this common case. */ | |
2550 | if (token->type == CPP_NAME | |
2551 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type != CPP_LESS) | |
2552 | return cp_parser_identifier (parser); | |
2553 | ||
a723baf1 MM |
2554 | cp_parser_parse_tentatively (parser); |
2555 | /* Try a template-id. */ | |
2556 | id = cp_parser_template_id (parser, | |
2557 | /*template_keyword_p=*/false, | |
2558 | /*check_dependency_p=*/true); | |
2559 | /* If that worked, we're done. */ | |
2560 | if (cp_parser_parse_definitely (parser)) | |
2561 | return id; | |
2562 | ||
e5976695 MM |
2563 | /* Peek at the next token. (Changes in the token buffer may |
2564 | have invalidated the pointer obtained above.) */ | |
a723baf1 MM |
2565 | token = cp_lexer_peek_token (parser->lexer); |
2566 | ||
2567 | switch (token->type) | |
2568 | { | |
2569 | case CPP_NAME: | |
2570 | return cp_parser_identifier (parser); | |
2571 | ||
2572 | case CPP_KEYWORD: | |
2573 | if (token->keyword == RID_OPERATOR) | |
2574 | return cp_parser_operator_function_id (parser); | |
2575 | /* Fall through. */ | |
2576 | ||
2577 | default: | |
2578 | cp_parser_error (parser, "expected id-expression"); | |
2579 | return error_mark_node; | |
2580 | } | |
2581 | } | |
2582 | else | |
2583 | return cp_parser_unqualified_id (parser, template_keyword_p, | |
2584 | /*check_dependency_p=*/true); | |
2585 | } | |
2586 | ||
2587 | /* Parse an unqualified-id. | |
2588 | ||
2589 | unqualified-id: | |
2590 | identifier | |
2591 | operator-function-id | |
2592 | conversion-function-id | |
2593 | ~ class-name | |
2594 | template-id | |
2595 | ||
2596 | If TEMPLATE_KEYWORD_P is TRUE, we have just seen the `template' | |
2597 | keyword, in a construct like `A::template ...'. | |
2598 | ||
2599 | Returns a representation of unqualified-id. For the `identifier' | |
2600 | production, an IDENTIFIER_NODE is returned. For the `~ class-name' | |
2601 | production a BIT_NOT_EXPR is returned; the operand of the | |
2602 | BIT_NOT_EXPR is an IDENTIFIER_NODE for the class-name. For the | |
2603 | other productions, see the documentation accompanying the | |
2604 | corresponding parsing functions. If CHECK_DEPENDENCY_P is false, | |
2605 | names are looked up in uninstantiated templates. */ | |
2606 | ||
2607 | static tree | |
94edc4ab NN |
2608 | cp_parser_unqualified_id (cp_parser* parser, |
2609 | bool template_keyword_p, | |
2610 | bool check_dependency_p) | |
a723baf1 MM |
2611 | { |
2612 | cp_token *token; | |
2613 | ||
2614 | /* Peek at the next token. */ | |
2615 | token = cp_lexer_peek_token (parser->lexer); | |
2616 | ||
2617 | switch (token->type) | |
2618 | { | |
2619 | case CPP_NAME: | |
2620 | { | |
2621 | tree id; | |
2622 | ||
2623 | /* We don't know yet whether or not this will be a | |
2624 | template-id. */ | |
2625 | cp_parser_parse_tentatively (parser); | |
2626 | /* Try a template-id. */ | |
2627 | id = cp_parser_template_id (parser, template_keyword_p, | |
2628 | check_dependency_p); | |
2629 | /* If it worked, we're done. */ | |
2630 | if (cp_parser_parse_definitely (parser)) | |
2631 | return id; | |
2632 | /* Otherwise, it's an ordinary identifier. */ | |
2633 | return cp_parser_identifier (parser); | |
2634 | } | |
2635 | ||
2636 | case CPP_TEMPLATE_ID: | |
2637 | return cp_parser_template_id (parser, template_keyword_p, | |
2638 | check_dependency_p); | |
2639 | ||
2640 | case CPP_COMPL: | |
2641 | { | |
2642 | tree type_decl; | |
2643 | tree qualifying_scope; | |
2644 | tree object_scope; | |
2645 | tree scope; | |
2646 | ||
2647 | /* Consume the `~' token. */ | |
2648 | cp_lexer_consume_token (parser->lexer); | |
2649 | /* Parse the class-name. The standard, as written, seems to | |
2650 | say that: | |
2651 | ||
2652 | template <typename T> struct S { ~S (); }; | |
2653 | template <typename T> S<T>::~S() {} | |
2654 | ||
2655 | is invalid, since `~' must be followed by a class-name, but | |
2656 | `S<T>' is dependent, and so not known to be a class. | |
2657 | That's not right; we need to look in uninstantiated | |
2658 | templates. A further complication arises from: | |
2659 | ||
2660 | template <typename T> void f(T t) { | |
2661 | t.T::~T(); | |
2662 | } | |
2663 | ||
2664 | Here, it is not possible to look up `T' in the scope of `T' | |
2665 | itself. We must look in both the current scope, and the | |
2666 | scope of the containing complete expression. | |
2667 | ||
2668 | Yet another issue is: | |
2669 | ||
2670 | struct S { | |
2671 | int S; | |
2672 | ~S(); | |
2673 | }; | |
2674 | ||
2675 | S::~S() {} | |
2676 | ||
2677 | The standard does not seem to say that the `S' in `~S' | |
2678 | should refer to the type `S' and not the data member | |
2679 | `S::S'. */ | |
2680 | ||
2681 | /* DR 244 says that we look up the name after the "~" in the | |
2682 | same scope as we looked up the qualifying name. That idea | |
2683 | isn't fully worked out; it's more complicated than that. */ | |
2684 | scope = parser->scope; | |
2685 | object_scope = parser->object_scope; | |
2686 | qualifying_scope = parser->qualifying_scope; | |
2687 | ||
2688 | /* If the name is of the form "X::~X" it's OK. */ | |
2689 | if (scope && TYPE_P (scope) | |
2690 | && cp_lexer_next_token_is (parser->lexer, CPP_NAME) | |
2691 | && (cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
2692 | == CPP_OPEN_PAREN) | |
2693 | && (cp_lexer_peek_token (parser->lexer)->value | |
2694 | == TYPE_IDENTIFIER (scope))) | |
2695 | { | |
2696 | cp_lexer_consume_token (parser->lexer); | |
2697 | return build_nt (BIT_NOT_EXPR, scope); | |
2698 | } | |
2699 | ||
2700 | /* If there was an explicit qualification (S::~T), first look | |
2701 | in the scope given by the qualification (i.e., S). */ | |
2702 | if (scope) | |
2703 | { | |
2704 | cp_parser_parse_tentatively (parser); | |
2705 | type_decl = cp_parser_class_name (parser, | |
2706 | /*typename_keyword_p=*/false, | |
2707 | /*template_keyword_p=*/false, | |
2708 | /*type_p=*/false, | |
a723baf1 MM |
2709 | /*check_dependency=*/false, |
2710 | /*class_head_p=*/false); | |
2711 | if (cp_parser_parse_definitely (parser)) | |
2712 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
2713 | } | |
2714 | /* In "N::S::~S", look in "N" as well. */ | |
2715 | if (scope && qualifying_scope) | |
2716 | { | |
2717 | cp_parser_parse_tentatively (parser); | |
2718 | parser->scope = qualifying_scope; | |
2719 | parser->object_scope = NULL_TREE; | |
2720 | parser->qualifying_scope = NULL_TREE; | |
2721 | type_decl | |
2722 | = cp_parser_class_name (parser, | |
2723 | /*typename_keyword_p=*/false, | |
2724 | /*template_keyword_p=*/false, | |
2725 | /*type_p=*/false, | |
a723baf1 MM |
2726 | /*check_dependency=*/false, |
2727 | /*class_head_p=*/false); | |
2728 | if (cp_parser_parse_definitely (parser)) | |
2729 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
2730 | } | |
2731 | /* In "p->S::~T", look in the scope given by "*p" as well. */ | |
2732 | else if (object_scope) | |
2733 | { | |
2734 | cp_parser_parse_tentatively (parser); | |
2735 | parser->scope = object_scope; | |
2736 | parser->object_scope = NULL_TREE; | |
2737 | parser->qualifying_scope = NULL_TREE; | |
2738 | type_decl | |
2739 | = cp_parser_class_name (parser, | |
2740 | /*typename_keyword_p=*/false, | |
2741 | /*template_keyword_p=*/false, | |
2742 | /*type_p=*/false, | |
a723baf1 MM |
2743 | /*check_dependency=*/false, |
2744 | /*class_head_p=*/false); | |
2745 | if (cp_parser_parse_definitely (parser)) | |
2746 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
2747 | } | |
2748 | /* Look in the surrounding context. */ | |
2749 | parser->scope = NULL_TREE; | |
2750 | parser->object_scope = NULL_TREE; | |
2751 | parser->qualifying_scope = NULL_TREE; | |
2752 | type_decl | |
2753 | = cp_parser_class_name (parser, | |
2754 | /*typename_keyword_p=*/false, | |
2755 | /*template_keyword_p=*/false, | |
2756 | /*type_p=*/false, | |
a723baf1 MM |
2757 | /*check_dependency=*/false, |
2758 | /*class_head_p=*/false); | |
2759 | /* If an error occurred, assume that the name of the | |
2760 | destructor is the same as the name of the qualifying | |
2761 | class. That allows us to keep parsing after running | |
2762 | into ill-formed destructor names. */ | |
2763 | if (type_decl == error_mark_node && scope && TYPE_P (scope)) | |
2764 | return build_nt (BIT_NOT_EXPR, scope); | |
2765 | else if (type_decl == error_mark_node) | |
2766 | return error_mark_node; | |
2767 | ||
2768 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
2769 | } | |
2770 | ||
2771 | case CPP_KEYWORD: | |
2772 | if (token->keyword == RID_OPERATOR) | |
2773 | { | |
2774 | tree id; | |
2775 | ||
2776 | /* This could be a template-id, so we try that first. */ | |
2777 | cp_parser_parse_tentatively (parser); | |
2778 | /* Try a template-id. */ | |
2779 | id = cp_parser_template_id (parser, template_keyword_p, | |
2780 | /*check_dependency_p=*/true); | |
2781 | /* If that worked, we're done. */ | |
2782 | if (cp_parser_parse_definitely (parser)) | |
2783 | return id; | |
2784 | /* We still don't know whether we're looking at an | |
2785 | operator-function-id or a conversion-function-id. */ | |
2786 | cp_parser_parse_tentatively (parser); | |
2787 | /* Try an operator-function-id. */ | |
2788 | id = cp_parser_operator_function_id (parser); | |
2789 | /* If that didn't work, try a conversion-function-id. */ | |
2790 | if (!cp_parser_parse_definitely (parser)) | |
2791 | id = cp_parser_conversion_function_id (parser); | |
2792 | ||
2793 | return id; | |
2794 | } | |
2795 | /* Fall through. */ | |
2796 | ||
2797 | default: | |
2798 | cp_parser_error (parser, "expected unqualified-id"); | |
2799 | return error_mark_node; | |
2800 | } | |
2801 | } | |
2802 | ||
2803 | /* Parse an (optional) nested-name-specifier. | |
2804 | ||
2805 | nested-name-specifier: | |
2806 | class-or-namespace-name :: nested-name-specifier [opt] | |
2807 | class-or-namespace-name :: template nested-name-specifier [opt] | |
2808 | ||
2809 | PARSER->SCOPE should be set appropriately before this function is | |
2810 | called. TYPENAME_KEYWORD_P is TRUE if the `typename' keyword is in | |
2811 | effect. TYPE_P is TRUE if we non-type bindings should be ignored | |
2812 | in name lookups. | |
2813 | ||
2814 | Sets PARSER->SCOPE to the class (TYPE) or namespace | |
2815 | (NAMESPACE_DECL) specified by the nested-name-specifier, or leaves | |
2816 | it unchanged if there is no nested-name-specifier. Returns the new | |
2817 | scope iff there is a nested-name-specifier, or NULL_TREE otherwise. */ | |
2818 | ||
2819 | static tree | |
2820 | cp_parser_nested_name_specifier_opt (cp_parser *parser, | |
2821 | bool typename_keyword_p, | |
2822 | bool check_dependency_p, | |
2823 | bool type_p) | |
2824 | { | |
2825 | bool success = false; | |
2826 | tree access_check = NULL_TREE; | |
2827 | ptrdiff_t start; | |
2050a1bb | 2828 | cp_token* token; |
a723baf1 MM |
2829 | |
2830 | /* If the next token corresponds to a nested name specifier, there | |
2050a1bb MM |
2831 | is no need to reparse it. However, if CHECK_DEPENDENCY_P is |
2832 | false, it may have been true before, in which case something | |
2833 | like `A<X>::B<Y>::C' may have resulted in a nested-name-specifier | |
2834 | of `A<X>::', where it should now be `A<X>::B<Y>::'. So, when | |
2835 | CHECK_DEPENDENCY_P is false, we have to fall through into the | |
2836 | main loop. */ | |
2837 | if (check_dependency_p | |
2838 | && cp_lexer_next_token_is (parser->lexer, CPP_NESTED_NAME_SPECIFIER)) | |
2839 | { | |
2840 | cp_parser_pre_parsed_nested_name_specifier (parser); | |
a723baf1 MM |
2841 | return parser->scope; |
2842 | } | |
2843 | ||
2844 | /* Remember where the nested-name-specifier starts. */ | |
2845 | if (cp_parser_parsing_tentatively (parser) | |
2846 | && !cp_parser_committed_to_tentative_parse (parser)) | |
2847 | { | |
2050a1bb | 2848 | token = cp_lexer_peek_token (parser->lexer); |
a723baf1 MM |
2849 | start = cp_lexer_token_difference (parser->lexer, |
2850 | parser->lexer->first_token, | |
2050a1bb | 2851 | token); |
a723baf1 MM |
2852 | } |
2853 | else | |
2854 | start = -1; | |
2855 | ||
8d241e0b | 2856 | push_deferring_access_checks (dk_deferred); |
cf22909c | 2857 | |
a723baf1 MM |
2858 | while (true) |
2859 | { | |
2860 | tree new_scope; | |
2861 | tree old_scope; | |
2862 | tree saved_qualifying_scope; | |
a723baf1 MM |
2863 | bool template_keyword_p; |
2864 | ||
2050a1bb MM |
2865 | /* Spot cases that cannot be the beginning of a |
2866 | nested-name-specifier. */ | |
2867 | token = cp_lexer_peek_token (parser->lexer); | |
2868 | ||
2869 | /* If the next token is CPP_NESTED_NAME_SPECIFIER, just process | |
2870 | the already parsed nested-name-specifier. */ | |
2871 | if (token->type == CPP_NESTED_NAME_SPECIFIER) | |
2872 | { | |
2873 | /* Grab the nested-name-specifier and continue the loop. */ | |
2874 | cp_parser_pre_parsed_nested_name_specifier (parser); | |
2875 | success = true; | |
2876 | continue; | |
2877 | } | |
2878 | ||
a723baf1 MM |
2879 | /* Spot cases that cannot be the beginning of a |
2880 | nested-name-specifier. On the second and subsequent times | |
2881 | through the loop, we look for the `template' keyword. */ | |
f7b5ecd9 | 2882 | if (success && token->keyword == RID_TEMPLATE) |
a723baf1 MM |
2883 | ; |
2884 | /* A template-id can start a nested-name-specifier. */ | |
f7b5ecd9 | 2885 | else if (token->type == CPP_TEMPLATE_ID) |
a723baf1 MM |
2886 | ; |
2887 | else | |
2888 | { | |
2889 | /* If the next token is not an identifier, then it is | |
2890 | definitely not a class-or-namespace-name. */ | |
f7b5ecd9 | 2891 | if (token->type != CPP_NAME) |
a723baf1 MM |
2892 | break; |
2893 | /* If the following token is neither a `<' (to begin a | |
2894 | template-id), nor a `::', then we are not looking at a | |
2895 | nested-name-specifier. */ | |
2896 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
2897 | if (token->type != CPP_LESS && token->type != CPP_SCOPE) | |
2898 | break; | |
2899 | } | |
2900 | ||
2901 | /* The nested-name-specifier is optional, so we parse | |
2902 | tentatively. */ | |
2903 | cp_parser_parse_tentatively (parser); | |
2904 | ||
2905 | /* Look for the optional `template' keyword, if this isn't the | |
2906 | first time through the loop. */ | |
2907 | if (success) | |
2908 | template_keyword_p = cp_parser_optional_template_keyword (parser); | |
2909 | else | |
2910 | template_keyword_p = false; | |
2911 | ||
2912 | /* Save the old scope since the name lookup we are about to do | |
2913 | might destroy it. */ | |
2914 | old_scope = parser->scope; | |
2915 | saved_qualifying_scope = parser->qualifying_scope; | |
2916 | /* Parse the qualifying entity. */ | |
2917 | new_scope | |
2918 | = cp_parser_class_or_namespace_name (parser, | |
2919 | typename_keyword_p, | |
2920 | template_keyword_p, | |
2921 | check_dependency_p, | |
2922 | type_p); | |
2923 | /* Look for the `::' token. */ | |
2924 | cp_parser_require (parser, CPP_SCOPE, "`::'"); | |
2925 | ||
2926 | /* If we found what we wanted, we keep going; otherwise, we're | |
2927 | done. */ | |
2928 | if (!cp_parser_parse_definitely (parser)) | |
2929 | { | |
2930 | bool error_p = false; | |
2931 | ||
2932 | /* Restore the OLD_SCOPE since it was valid before the | |
2933 | failed attempt at finding the last | |
2934 | class-or-namespace-name. */ | |
2935 | parser->scope = old_scope; | |
2936 | parser->qualifying_scope = saved_qualifying_scope; | |
2937 | /* If the next token is an identifier, and the one after | |
2938 | that is a `::', then any valid interpretation would have | |
2939 | found a class-or-namespace-name. */ | |
2940 | while (cp_lexer_next_token_is (parser->lexer, CPP_NAME) | |
2941 | && (cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
2942 | == CPP_SCOPE) | |
2943 | && (cp_lexer_peek_nth_token (parser->lexer, 3)->type | |
2944 | != CPP_COMPL)) | |
2945 | { | |
2946 | token = cp_lexer_consume_token (parser->lexer); | |
2947 | if (!error_p) | |
2948 | { | |
2949 | tree decl; | |
2950 | ||
2951 | decl = cp_parser_lookup_name_simple (parser, token->value); | |
2952 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
2953 | error ("`%D' used without template parameters", | |
2954 | decl); | |
2955 | else if (parser->scope) | |
2956 | { | |
2957 | if (TYPE_P (parser->scope)) | |
2958 | error ("`%T::%D' is not a class-name or " | |
2959 | "namespace-name", | |
2960 | parser->scope, token->value); | |
2961 | else | |
2962 | error ("`%D::%D' is not a class-name or " | |
2963 | "namespace-name", | |
2964 | parser->scope, token->value); | |
2965 | } | |
2966 | else | |
2967 | error ("`%D' is not a class-name or namespace-name", | |
2968 | token->value); | |
2969 | parser->scope = NULL_TREE; | |
2970 | error_p = true; | |
eea9800f MM |
2971 | /* Treat this as a successful nested-name-specifier |
2972 | due to: | |
2973 | ||
2974 | [basic.lookup.qual] | |
2975 | ||
2976 | If the name found is not a class-name (clause | |
2977 | _class_) or namespace-name (_namespace.def_), the | |
2978 | program is ill-formed. */ | |
2979 | success = true; | |
a723baf1 MM |
2980 | } |
2981 | cp_lexer_consume_token (parser->lexer); | |
2982 | } | |
2983 | break; | |
2984 | } | |
2985 | ||
2986 | /* We've found one valid nested-name-specifier. */ | |
2987 | success = true; | |
2988 | /* Make sure we look in the right scope the next time through | |
2989 | the loop. */ | |
2990 | parser->scope = (TREE_CODE (new_scope) == TYPE_DECL | |
2991 | ? TREE_TYPE (new_scope) | |
2992 | : new_scope); | |
2993 | /* If it is a class scope, try to complete it; we are about to | |
2994 | be looking up names inside the class. */ | |
8fbc5ae7 MM |
2995 | if (TYPE_P (parser->scope) |
2996 | /* Since checking types for dependency can be expensive, | |
2997 | avoid doing it if the type is already complete. */ | |
2998 | && !COMPLETE_TYPE_P (parser->scope) | |
2999 | /* Do not try to complete dependent types. */ | |
1fb3244a | 3000 | && !dependent_type_p (parser->scope)) |
a723baf1 MM |
3001 | complete_type (parser->scope); |
3002 | } | |
3003 | ||
cf22909c KL |
3004 | /* Retrieve any deferred checks. Do not pop this access checks yet |
3005 | so the memory will not be reclaimed during token replacing below. */ | |
3006 | access_check = get_deferred_access_checks (); | |
3007 | ||
a723baf1 MM |
3008 | /* If parsing tentatively, replace the sequence of tokens that makes |
3009 | up the nested-name-specifier with a CPP_NESTED_NAME_SPECIFIER | |
3010 | token. That way, should we re-parse the token stream, we will | |
3011 | not have to repeat the effort required to do the parse, nor will | |
3012 | we issue duplicate error messages. */ | |
3013 | if (success && start >= 0) | |
3014 | { | |
a723baf1 MM |
3015 | /* Find the token that corresponds to the start of the |
3016 | template-id. */ | |
3017 | token = cp_lexer_advance_token (parser->lexer, | |
3018 | parser->lexer->first_token, | |
3019 | start); | |
3020 | ||
a723baf1 MM |
3021 | /* Reset the contents of the START token. */ |
3022 | token->type = CPP_NESTED_NAME_SPECIFIER; | |
3023 | token->value = build_tree_list (access_check, parser->scope); | |
3024 | TREE_TYPE (token->value) = parser->qualifying_scope; | |
3025 | token->keyword = RID_MAX; | |
3026 | /* Purge all subsequent tokens. */ | |
3027 | cp_lexer_purge_tokens_after (parser->lexer, token); | |
3028 | } | |
3029 | ||
cf22909c | 3030 | pop_deferring_access_checks (); |
a723baf1 MM |
3031 | return success ? parser->scope : NULL_TREE; |
3032 | } | |
3033 | ||
3034 | /* Parse a nested-name-specifier. See | |
3035 | cp_parser_nested_name_specifier_opt for details. This function | |
3036 | behaves identically, except that it will an issue an error if no | |
3037 | nested-name-specifier is present, and it will return | |
3038 | ERROR_MARK_NODE, rather than NULL_TREE, if no nested-name-specifier | |
3039 | is present. */ | |
3040 | ||
3041 | static tree | |
3042 | cp_parser_nested_name_specifier (cp_parser *parser, | |
3043 | bool typename_keyword_p, | |
3044 | bool check_dependency_p, | |
3045 | bool type_p) | |
3046 | { | |
3047 | tree scope; | |
3048 | ||
3049 | /* Look for the nested-name-specifier. */ | |
3050 | scope = cp_parser_nested_name_specifier_opt (parser, | |
3051 | typename_keyword_p, | |
3052 | check_dependency_p, | |
3053 | type_p); | |
3054 | /* If it was not present, issue an error message. */ | |
3055 | if (!scope) | |
3056 | { | |
3057 | cp_parser_error (parser, "expected nested-name-specifier"); | |
3058 | return error_mark_node; | |
3059 | } | |
3060 | ||
3061 | return scope; | |
3062 | } | |
3063 | ||
3064 | /* Parse a class-or-namespace-name. | |
3065 | ||
3066 | class-or-namespace-name: | |
3067 | class-name | |
3068 | namespace-name | |
3069 | ||
3070 | TYPENAME_KEYWORD_P is TRUE iff the `typename' keyword is in effect. | |
3071 | TEMPLATE_KEYWORD_P is TRUE iff the `template' keyword is in effect. | |
3072 | CHECK_DEPENDENCY_P is FALSE iff dependent names should be looked up. | |
3073 | TYPE_P is TRUE iff the next name should be taken as a class-name, | |
3074 | even the same name is declared to be another entity in the same | |
3075 | scope. | |
3076 | ||
3077 | Returns the class (TYPE_DECL) or namespace (NAMESPACE_DECL) | |
eea9800f MM |
3078 | specified by the class-or-namespace-name. If neither is found the |
3079 | ERROR_MARK_NODE is returned. */ | |
a723baf1 MM |
3080 | |
3081 | static tree | |
3082 | cp_parser_class_or_namespace_name (cp_parser *parser, | |
3083 | bool typename_keyword_p, | |
3084 | bool template_keyword_p, | |
3085 | bool check_dependency_p, | |
3086 | bool type_p) | |
3087 | { | |
3088 | tree saved_scope; | |
3089 | tree saved_qualifying_scope; | |
3090 | tree saved_object_scope; | |
3091 | tree scope; | |
eea9800f | 3092 | bool only_class_p; |
a723baf1 | 3093 | |
a723baf1 MM |
3094 | /* Before we try to parse the class-name, we must save away the |
3095 | current PARSER->SCOPE since cp_parser_class_name will destroy | |
3096 | it. */ | |
3097 | saved_scope = parser->scope; | |
3098 | saved_qualifying_scope = parser->qualifying_scope; | |
3099 | saved_object_scope = parser->object_scope; | |
eea9800f MM |
3100 | /* Try for a class-name first. If the SAVED_SCOPE is a type, then |
3101 | there is no need to look for a namespace-name. */ | |
bbaab916 | 3102 | only_class_p = template_keyword_p || (saved_scope && TYPE_P (saved_scope)); |
eea9800f MM |
3103 | if (!only_class_p) |
3104 | cp_parser_parse_tentatively (parser); | |
a723baf1 MM |
3105 | scope = cp_parser_class_name (parser, |
3106 | typename_keyword_p, | |
3107 | template_keyword_p, | |
3108 | type_p, | |
a723baf1 MM |
3109 | check_dependency_p, |
3110 | /*class_head_p=*/false); | |
3111 | /* If that didn't work, try for a namespace-name. */ | |
eea9800f | 3112 | if (!only_class_p && !cp_parser_parse_definitely (parser)) |
a723baf1 MM |
3113 | { |
3114 | /* Restore the saved scope. */ | |
3115 | parser->scope = saved_scope; | |
3116 | parser->qualifying_scope = saved_qualifying_scope; | |
3117 | parser->object_scope = saved_object_scope; | |
eea9800f MM |
3118 | /* If we are not looking at an identifier followed by the scope |
3119 | resolution operator, then this is not part of a | |
3120 | nested-name-specifier. (Note that this function is only used | |
3121 | to parse the components of a nested-name-specifier.) */ | |
3122 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_NAME) | |
3123 | || cp_lexer_peek_nth_token (parser->lexer, 2)->type != CPP_SCOPE) | |
3124 | return error_mark_node; | |
a723baf1 MM |
3125 | scope = cp_parser_namespace_name (parser); |
3126 | } | |
3127 | ||
3128 | return scope; | |
3129 | } | |
3130 | ||
3131 | /* Parse a postfix-expression. | |
3132 | ||
3133 | postfix-expression: | |
3134 | primary-expression | |
3135 | postfix-expression [ expression ] | |
3136 | postfix-expression ( expression-list [opt] ) | |
3137 | simple-type-specifier ( expression-list [opt] ) | |
3138 | typename :: [opt] nested-name-specifier identifier | |
3139 | ( expression-list [opt] ) | |
3140 | typename :: [opt] nested-name-specifier template [opt] template-id | |
3141 | ( expression-list [opt] ) | |
3142 | postfix-expression . template [opt] id-expression | |
3143 | postfix-expression -> template [opt] id-expression | |
3144 | postfix-expression . pseudo-destructor-name | |
3145 | postfix-expression -> pseudo-destructor-name | |
3146 | postfix-expression ++ | |
3147 | postfix-expression -- | |
3148 | dynamic_cast < type-id > ( expression ) | |
3149 | static_cast < type-id > ( expression ) | |
3150 | reinterpret_cast < type-id > ( expression ) | |
3151 | const_cast < type-id > ( expression ) | |
3152 | typeid ( expression ) | |
3153 | typeid ( type-id ) | |
3154 | ||
3155 | GNU Extension: | |
3156 | ||
3157 | postfix-expression: | |
3158 | ( type-id ) { initializer-list , [opt] } | |
3159 | ||
3160 | This extension is a GNU version of the C99 compound-literal | |
3161 | construct. (The C99 grammar uses `type-name' instead of `type-id', | |
3162 | but they are essentially the same concept.) | |
3163 | ||
3164 | If ADDRESS_P is true, the postfix expression is the operand of the | |
3165 | `&' operator. | |
3166 | ||
3167 | Returns a representation of the expression. */ | |
3168 | ||
3169 | static tree | |
3170 | cp_parser_postfix_expression (cp_parser *parser, bool address_p) | |
3171 | { | |
3172 | cp_token *token; | |
3173 | enum rid keyword; | |
b3445994 | 3174 | cp_id_kind idk = CP_ID_KIND_NONE; |
a723baf1 MM |
3175 | tree postfix_expression = NULL_TREE; |
3176 | /* Non-NULL only if the current postfix-expression can be used to | |
3177 | form a pointer-to-member. In that case, QUALIFYING_CLASS is the | |
3178 | class used to qualify the member. */ | |
3179 | tree qualifying_class = NULL_TREE; | |
a723baf1 MM |
3180 | |
3181 | /* Peek at the next token. */ | |
3182 | token = cp_lexer_peek_token (parser->lexer); | |
3183 | /* Some of the productions are determined by keywords. */ | |
3184 | keyword = token->keyword; | |
3185 | switch (keyword) | |
3186 | { | |
3187 | case RID_DYNCAST: | |
3188 | case RID_STATCAST: | |
3189 | case RID_REINTCAST: | |
3190 | case RID_CONSTCAST: | |
3191 | { | |
3192 | tree type; | |
3193 | tree expression; | |
3194 | const char *saved_message; | |
3195 | ||
3196 | /* All of these can be handled in the same way from the point | |
3197 | of view of parsing. Begin by consuming the token | |
3198 | identifying the cast. */ | |
3199 | cp_lexer_consume_token (parser->lexer); | |
3200 | ||
3201 | /* New types cannot be defined in the cast. */ | |
3202 | saved_message = parser->type_definition_forbidden_message; | |
3203 | parser->type_definition_forbidden_message | |
3204 | = "types may not be defined in casts"; | |
3205 | ||
3206 | /* Look for the opening `<'. */ | |
3207 | cp_parser_require (parser, CPP_LESS, "`<'"); | |
3208 | /* Parse the type to which we are casting. */ | |
3209 | type = cp_parser_type_id (parser); | |
3210 | /* Look for the closing `>'. */ | |
3211 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
3212 | /* Restore the old message. */ | |
3213 | parser->type_definition_forbidden_message = saved_message; | |
3214 | ||
3215 | /* And the expression which is being cast. */ | |
3216 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
3217 | expression = cp_parser_expression (parser); | |
3218 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3219 | ||
14d22dd6 MM |
3220 | /* Only type conversions to integral or enumeration types |
3221 | can be used in constant-expressions. */ | |
3222 | if (parser->constant_expression_p | |
3223 | && !dependent_type_p (type) | |
3224 | && !INTEGRAL_OR_ENUMERATION_TYPE_P (type)) | |
3225 | { | |
3226 | if (!parser->allow_non_constant_expression_p) | |
3227 | return (cp_parser_non_constant_expression | |
3228 | ("a cast to a type other than an integral or " | |
3229 | "enumeration type")); | |
3230 | parser->non_constant_expression_p = true; | |
3231 | } | |
3232 | ||
a723baf1 MM |
3233 | switch (keyword) |
3234 | { | |
3235 | case RID_DYNCAST: | |
3236 | postfix_expression | |
3237 | = build_dynamic_cast (type, expression); | |
3238 | break; | |
3239 | case RID_STATCAST: | |
3240 | postfix_expression | |
3241 | = build_static_cast (type, expression); | |
3242 | break; | |
3243 | case RID_REINTCAST: | |
3244 | postfix_expression | |
3245 | = build_reinterpret_cast (type, expression); | |
3246 | break; | |
3247 | case RID_CONSTCAST: | |
3248 | postfix_expression | |
3249 | = build_const_cast (type, expression); | |
3250 | break; | |
3251 | default: | |
3252 | abort (); | |
3253 | } | |
3254 | } | |
3255 | break; | |
3256 | ||
3257 | case RID_TYPEID: | |
3258 | { | |
3259 | tree type; | |
3260 | const char *saved_message; | |
3261 | ||
3262 | /* Consume the `typeid' token. */ | |
3263 | cp_lexer_consume_token (parser->lexer); | |
3264 | /* Look for the `(' token. */ | |
3265 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
3266 | /* Types cannot be defined in a `typeid' expression. */ | |
3267 | saved_message = parser->type_definition_forbidden_message; | |
3268 | parser->type_definition_forbidden_message | |
3269 | = "types may not be defined in a `typeid\' expression"; | |
3270 | /* We can't be sure yet whether we're looking at a type-id or an | |
3271 | expression. */ | |
3272 | cp_parser_parse_tentatively (parser); | |
3273 | /* Try a type-id first. */ | |
3274 | type = cp_parser_type_id (parser); | |
3275 | /* Look for the `)' token. Otherwise, we can't be sure that | |
3276 | we're not looking at an expression: consider `typeid (int | |
3277 | (3))', for example. */ | |
3278 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3279 | /* If all went well, simply lookup the type-id. */ | |
3280 | if (cp_parser_parse_definitely (parser)) | |
3281 | postfix_expression = get_typeid (type); | |
3282 | /* Otherwise, fall back to the expression variant. */ | |
3283 | else | |
3284 | { | |
3285 | tree expression; | |
3286 | ||
3287 | /* Look for an expression. */ | |
3288 | expression = cp_parser_expression (parser); | |
3289 | /* Compute its typeid. */ | |
3290 | postfix_expression = build_typeid (expression); | |
3291 | /* Look for the `)' token. */ | |
3292 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3293 | } | |
3294 | ||
3295 | /* Restore the saved message. */ | |
3296 | parser->type_definition_forbidden_message = saved_message; | |
3297 | } | |
3298 | break; | |
3299 | ||
3300 | case RID_TYPENAME: | |
3301 | { | |
3302 | bool template_p = false; | |
3303 | tree id; | |
3304 | tree type; | |
3305 | ||
3306 | /* Consume the `typename' token. */ | |
3307 | cp_lexer_consume_token (parser->lexer); | |
3308 | /* Look for the optional `::' operator. */ | |
3309 | cp_parser_global_scope_opt (parser, | |
3310 | /*current_scope_valid_p=*/false); | |
3311 | /* Look for the nested-name-specifier. */ | |
3312 | cp_parser_nested_name_specifier (parser, | |
3313 | /*typename_keyword_p=*/true, | |
3314 | /*check_dependency_p=*/true, | |
3315 | /*type_p=*/true); | |
3316 | /* Look for the optional `template' keyword. */ | |
3317 | template_p = cp_parser_optional_template_keyword (parser); | |
3318 | /* We don't know whether we're looking at a template-id or an | |
3319 | identifier. */ | |
3320 | cp_parser_parse_tentatively (parser); | |
3321 | /* Try a template-id. */ | |
3322 | id = cp_parser_template_id (parser, template_p, | |
3323 | /*check_dependency_p=*/true); | |
3324 | /* If that didn't work, try an identifier. */ | |
3325 | if (!cp_parser_parse_definitely (parser)) | |
3326 | id = cp_parser_identifier (parser); | |
3327 | /* Create a TYPENAME_TYPE to represent the type to which the | |
3328 | functional cast is being performed. */ | |
3329 | type = make_typename_type (parser->scope, id, | |
3330 | /*complain=*/1); | |
3331 | ||
3332 | postfix_expression = cp_parser_functional_cast (parser, type); | |
3333 | } | |
3334 | break; | |
3335 | ||
3336 | default: | |
3337 | { | |
3338 | tree type; | |
3339 | ||
3340 | /* If the next thing is a simple-type-specifier, we may be | |
3341 | looking at a functional cast. We could also be looking at | |
3342 | an id-expression. So, we try the functional cast, and if | |
3343 | that doesn't work we fall back to the primary-expression. */ | |
3344 | cp_parser_parse_tentatively (parser); | |
3345 | /* Look for the simple-type-specifier. */ | |
3346 | type = cp_parser_simple_type_specifier (parser, | |
3347 | CP_PARSER_FLAGS_NONE); | |
3348 | /* Parse the cast itself. */ | |
3349 | if (!cp_parser_error_occurred (parser)) | |
3350 | postfix_expression | |
3351 | = cp_parser_functional_cast (parser, type); | |
3352 | /* If that worked, we're done. */ | |
3353 | if (cp_parser_parse_definitely (parser)) | |
3354 | break; | |
3355 | ||
3356 | /* If the functional-cast didn't work out, try a | |
3357 | compound-literal. */ | |
14d22dd6 MM |
3358 | if (cp_parser_allow_gnu_extensions_p (parser) |
3359 | && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
a723baf1 MM |
3360 | { |
3361 | tree initializer_list = NULL_TREE; | |
3362 | ||
3363 | cp_parser_parse_tentatively (parser); | |
14d22dd6 MM |
3364 | /* Consume the `('. */ |
3365 | cp_lexer_consume_token (parser->lexer); | |
3366 | /* Parse the type. */ | |
3367 | type = cp_parser_type_id (parser); | |
3368 | /* Look for the `)'. */ | |
3369 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3370 | /* Look for the `{'. */ | |
3371 | cp_parser_require (parser, CPP_OPEN_BRACE, "`{'"); | |
3372 | /* If things aren't going well, there's no need to | |
3373 | keep going. */ | |
3374 | if (!cp_parser_error_occurred (parser)) | |
a723baf1 | 3375 | { |
39703eb9 | 3376 | bool non_constant_p; |
14d22dd6 MM |
3377 | /* Parse the initializer-list. */ |
3378 | initializer_list | |
39703eb9 | 3379 | = cp_parser_initializer_list (parser, &non_constant_p); |
14d22dd6 MM |
3380 | /* Allow a trailing `,'. */ |
3381 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
3382 | cp_lexer_consume_token (parser->lexer); | |
3383 | /* Look for the final `}'. */ | |
3384 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
a723baf1 MM |
3385 | } |
3386 | /* If that worked, we're definitely looking at a | |
3387 | compound-literal expression. */ | |
3388 | if (cp_parser_parse_definitely (parser)) | |
3389 | { | |
3390 | /* Warn the user that a compound literal is not | |
3391 | allowed in standard C++. */ | |
3392 | if (pedantic) | |
3393 | pedwarn ("ISO C++ forbids compound-literals"); | |
3394 | /* Form the representation of the compound-literal. */ | |
3395 | postfix_expression | |
3396 | = finish_compound_literal (type, initializer_list); | |
3397 | break; | |
3398 | } | |
3399 | } | |
3400 | ||
3401 | /* It must be a primary-expression. */ | |
3402 | postfix_expression = cp_parser_primary_expression (parser, | |
3403 | &idk, | |
3404 | &qualifying_class); | |
3405 | } | |
3406 | break; | |
3407 | } | |
3408 | ||
ee76b931 MM |
3409 | /* If we were avoiding committing to the processing of a |
3410 | qualified-id until we knew whether or not we had a | |
3411 | pointer-to-member, we now know. */ | |
089d6ea7 | 3412 | if (qualifying_class) |
a723baf1 | 3413 | { |
ee76b931 | 3414 | bool done; |
a723baf1 | 3415 | |
ee76b931 MM |
3416 | /* Peek at the next token. */ |
3417 | token = cp_lexer_peek_token (parser->lexer); | |
3418 | done = (token->type != CPP_OPEN_SQUARE | |
3419 | && token->type != CPP_OPEN_PAREN | |
3420 | && token->type != CPP_DOT | |
3421 | && token->type != CPP_DEREF | |
3422 | && token->type != CPP_PLUS_PLUS | |
3423 | && token->type != CPP_MINUS_MINUS); | |
3424 | ||
3425 | postfix_expression = finish_qualified_id_expr (qualifying_class, | |
3426 | postfix_expression, | |
3427 | done, | |
3428 | address_p); | |
3429 | if (done) | |
3430 | return postfix_expression; | |
a723baf1 MM |
3431 | } |
3432 | ||
3433 | /* Remember that there was a reference to this entity. */ | |
3434 | if (DECL_P (postfix_expression)) | |
3435 | mark_used (postfix_expression); | |
3436 | ||
3437 | /* Keep looping until the postfix-expression is complete. */ | |
3438 | while (true) | |
3439 | { | |
10b1d5e7 MM |
3440 | if (idk == CP_ID_KIND_UNQUALIFIED |
3441 | && TREE_CODE (postfix_expression) == IDENTIFIER_NODE | |
a723baf1 | 3442 | && cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_PAREN)) |
b3445994 MM |
3443 | /* It is not a Koenig lookup function call. */ |
3444 | postfix_expression | |
3445 | = unqualified_name_lookup_error (postfix_expression); | |
a723baf1 MM |
3446 | |
3447 | /* Peek at the next token. */ | |
3448 | token = cp_lexer_peek_token (parser->lexer); | |
3449 | ||
3450 | switch (token->type) | |
3451 | { | |
3452 | case CPP_OPEN_SQUARE: | |
3453 | /* postfix-expression [ expression ] */ | |
3454 | { | |
3455 | tree index; | |
3456 | ||
3457 | /* Consume the `[' token. */ | |
3458 | cp_lexer_consume_token (parser->lexer); | |
3459 | /* Parse the index expression. */ | |
3460 | index = cp_parser_expression (parser); | |
3461 | /* Look for the closing `]'. */ | |
3462 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
3463 | ||
3464 | /* Build the ARRAY_REF. */ | |
3465 | postfix_expression | |
3466 | = grok_array_decl (postfix_expression, index); | |
b3445994 | 3467 | idk = CP_ID_KIND_NONE; |
a723baf1 MM |
3468 | } |
3469 | break; | |
3470 | ||
3471 | case CPP_OPEN_PAREN: | |
3472 | /* postfix-expression ( expression-list [opt] ) */ | |
3473 | { | |
39703eb9 MM |
3474 | tree args = (cp_parser_parenthesized_expression_list |
3475 | (parser, false, /*non_constant_p=*/NULL)); | |
a723baf1 | 3476 | |
7efa3e22 NS |
3477 | if (args == error_mark_node) |
3478 | { | |
3479 | postfix_expression = error_mark_node; | |
3480 | break; | |
3481 | } | |
3482 | ||
14d22dd6 MM |
3483 | /* Function calls are not permitted in |
3484 | constant-expressions. */ | |
3485 | if (parser->constant_expression_p) | |
3486 | { | |
3487 | if (!parser->allow_non_constant_expression_p) | |
3488 | return cp_parser_non_constant_expression ("a function call"); | |
3489 | parser->non_constant_expression_p = true; | |
3490 | } | |
a723baf1 | 3491 | |
b3445994 | 3492 | if (idk == CP_ID_KIND_UNQUALIFIED |
a723baf1 MM |
3493 | && (is_overloaded_fn (postfix_expression) |
3494 | || DECL_P (postfix_expression) | |
3495 | || TREE_CODE (postfix_expression) == IDENTIFIER_NODE) | |
3496 | && args) | |
b3445994 MM |
3497 | postfix_expression |
3498 | = perform_koenig_lookup (postfix_expression, args); | |
3499 | else if (idk == CP_ID_KIND_UNQUALIFIED | |
a723baf1 | 3500 | && TREE_CODE (postfix_expression) == IDENTIFIER_NODE) |
b3445994 MM |
3501 | postfix_expression |
3502 | = unqualified_fn_lookup_error (postfix_expression); | |
a723baf1 | 3503 | |
d17811fd | 3504 | if (TREE_CODE (postfix_expression) == COMPONENT_REF) |
a723baf1 | 3505 | { |
d17811fd MM |
3506 | tree instance = TREE_OPERAND (postfix_expression, 0); |
3507 | tree fn = TREE_OPERAND (postfix_expression, 1); | |
3508 | ||
3509 | if (processing_template_decl | |
3510 | && (type_dependent_expression_p (instance) | |
3511 | || (!BASELINK_P (fn) | |
3512 | && TREE_CODE (fn) != FIELD_DECL) | |
584672ee | 3513 | || type_dependent_expression_p (fn) |
d17811fd MM |
3514 | || any_type_dependent_arguments_p (args))) |
3515 | { | |
3516 | postfix_expression | |
3517 | = build_min_nt (CALL_EXPR, postfix_expression, args); | |
3518 | break; | |
3519 | } | |
3520 | ||
3521 | postfix_expression | |
3522 | = (build_new_method_call | |
3523 | (instance, fn, args, NULL_TREE, | |
b3445994 | 3524 | (idk == CP_ID_KIND_QUALIFIED |
d17811fd | 3525 | ? LOOKUP_NONVIRTUAL : LOOKUP_NORMAL))); |
a723baf1 | 3526 | } |
d17811fd MM |
3527 | else if (TREE_CODE (postfix_expression) == OFFSET_REF |
3528 | || TREE_CODE (postfix_expression) == MEMBER_REF | |
3529 | || TREE_CODE (postfix_expression) == DOTSTAR_EXPR) | |
a723baf1 MM |
3530 | postfix_expression = (build_offset_ref_call_from_tree |
3531 | (postfix_expression, args)); | |
b3445994 | 3532 | else if (idk == CP_ID_KIND_QUALIFIED) |
2050a1bb MM |
3533 | /* A call to a static class member, or a namespace-scope |
3534 | function. */ | |
3535 | postfix_expression | |
3536 | = finish_call_expr (postfix_expression, args, | |
3537 | /*disallow_virtual=*/true); | |
a723baf1 | 3538 | else |
2050a1bb MM |
3539 | /* All other function calls. */ |
3540 | postfix_expression | |
3541 | = finish_call_expr (postfix_expression, args, | |
3542 | /*disallow_virtual=*/false); | |
a723baf1 MM |
3543 | |
3544 | /* The POSTFIX_EXPRESSION is certainly no longer an id. */ | |
b3445994 | 3545 | idk = CP_ID_KIND_NONE; |
a723baf1 MM |
3546 | } |
3547 | break; | |
3548 | ||
3549 | case CPP_DOT: | |
3550 | case CPP_DEREF: | |
3551 | /* postfix-expression . template [opt] id-expression | |
3552 | postfix-expression . pseudo-destructor-name | |
3553 | postfix-expression -> template [opt] id-expression | |
3554 | postfix-expression -> pseudo-destructor-name */ | |
3555 | { | |
3556 | tree name; | |
3557 | bool dependent_p; | |
3558 | bool template_p; | |
3559 | tree scope = NULL_TREE; | |
3560 | ||
3561 | /* If this is a `->' operator, dereference the pointer. */ | |
3562 | if (token->type == CPP_DEREF) | |
3563 | postfix_expression = build_x_arrow (postfix_expression); | |
3564 | /* Check to see whether or not the expression is | |
3565 | type-dependent. */ | |
bbaab916 | 3566 | dependent_p = type_dependent_expression_p (postfix_expression); |
a723baf1 MM |
3567 | /* The identifier following the `->' or `.' is not |
3568 | qualified. */ | |
3569 | parser->scope = NULL_TREE; | |
3570 | parser->qualifying_scope = NULL_TREE; | |
3571 | parser->object_scope = NULL_TREE; | |
b3445994 | 3572 | idk = CP_ID_KIND_NONE; |
a723baf1 MM |
3573 | /* Enter the scope corresponding to the type of the object |
3574 | given by the POSTFIX_EXPRESSION. */ | |
3575 | if (!dependent_p | |
3576 | && TREE_TYPE (postfix_expression) != NULL_TREE) | |
3577 | { | |
3578 | scope = TREE_TYPE (postfix_expression); | |
3579 | /* According to the standard, no expression should | |
3580 | ever have reference type. Unfortunately, we do not | |
3581 | currently match the standard in this respect in | |
3582 | that our internal representation of an expression | |
3583 | may have reference type even when the standard says | |
3584 | it does not. Therefore, we have to manually obtain | |
3585 | the underlying type here. */ | |
ee76b931 | 3586 | scope = non_reference (scope); |
a723baf1 MM |
3587 | /* If the SCOPE is an OFFSET_TYPE, then we grab the |
3588 | type of the field. We get an OFFSET_TYPE for | |
3589 | something like: | |
3590 | ||
3591 | S::T.a ... | |
3592 | ||
3593 | Probably, we should not get an OFFSET_TYPE here; | |
3594 | that transformation should be made only if `&S::T' | |
3595 | is written. */ | |
3596 | if (TREE_CODE (scope) == OFFSET_TYPE) | |
3597 | scope = TREE_TYPE (scope); | |
3598 | /* The type of the POSTFIX_EXPRESSION must be | |
3599 | complete. */ | |
3600 | scope = complete_type_or_else (scope, NULL_TREE); | |
3601 | /* Let the name lookup machinery know that we are | |
3602 | processing a class member access expression. */ | |
3603 | parser->context->object_type = scope; | |
3604 | /* If something went wrong, we want to be able to | |
3605 | discern that case, as opposed to the case where | |
3606 | there was no SCOPE due to the type of expression | |
3607 | being dependent. */ | |
3608 | if (!scope) | |
3609 | scope = error_mark_node; | |
3610 | } | |
3611 | ||
3612 | /* Consume the `.' or `->' operator. */ | |
3613 | cp_lexer_consume_token (parser->lexer); | |
3614 | /* If the SCOPE is not a scalar type, we are looking at an | |
3615 | ordinary class member access expression, rather than a | |
3616 | pseudo-destructor-name. */ | |
3617 | if (!scope || !SCALAR_TYPE_P (scope)) | |
3618 | { | |
3619 | template_p = cp_parser_optional_template_keyword (parser); | |
3620 | /* Parse the id-expression. */ | |
3621 | name = cp_parser_id_expression (parser, | |
3622 | template_p, | |
3623 | /*check_dependency_p=*/true, | |
3624 | /*template_p=*/NULL); | |
3625 | /* In general, build a SCOPE_REF if the member name is | |
3626 | qualified. However, if the name was not dependent | |
3627 | and has already been resolved; there is no need to | |
3628 | build the SCOPE_REF. For example; | |
3629 | ||
3630 | struct X { void f(); }; | |
3631 | template <typename T> void f(T* t) { t->X::f(); } | |
3632 | ||
d17811fd MM |
3633 | Even though "t" is dependent, "X::f" is not and has |
3634 | been resolved to a BASELINK; there is no need to | |
a723baf1 | 3635 | include scope information. */ |
a6bd211d JM |
3636 | |
3637 | /* But we do need to remember that there was an explicit | |
3638 | scope for virtual function calls. */ | |
3639 | if (parser->scope) | |
b3445994 | 3640 | idk = CP_ID_KIND_QUALIFIED; |
a6bd211d | 3641 | |
a723baf1 MM |
3642 | if (name != error_mark_node |
3643 | && !BASELINK_P (name) | |
3644 | && parser->scope) | |
3645 | { | |
3646 | name = build_nt (SCOPE_REF, parser->scope, name); | |
3647 | parser->scope = NULL_TREE; | |
3648 | parser->qualifying_scope = NULL_TREE; | |
3649 | parser->object_scope = NULL_TREE; | |
3650 | } | |
3651 | postfix_expression | |
3652 | = finish_class_member_access_expr (postfix_expression, name); | |
3653 | } | |
3654 | /* Otherwise, try the pseudo-destructor-name production. */ | |
3655 | else | |
3656 | { | |
3657 | tree s; | |
3658 | tree type; | |
3659 | ||
3660 | /* Parse the pseudo-destructor-name. */ | |
3661 | cp_parser_pseudo_destructor_name (parser, &s, &type); | |
3662 | /* Form the call. */ | |
3663 | postfix_expression | |
3664 | = finish_pseudo_destructor_expr (postfix_expression, | |
3665 | s, TREE_TYPE (type)); | |
3666 | } | |
3667 | ||
3668 | /* We no longer need to look up names in the scope of the | |
3669 | object on the left-hand side of the `.' or `->' | |
3670 | operator. */ | |
3671 | parser->context->object_type = NULL_TREE; | |
a723baf1 MM |
3672 | } |
3673 | break; | |
3674 | ||
3675 | case CPP_PLUS_PLUS: | |
3676 | /* postfix-expression ++ */ | |
3677 | /* Consume the `++' token. */ | |
3678 | cp_lexer_consume_token (parser->lexer); | |
14d22dd6 MM |
3679 | /* Increments may not appear in constant-expressions. */ |
3680 | if (parser->constant_expression_p) | |
3681 | { | |
3682 | if (!parser->allow_non_constant_expression_p) | |
3683 | return cp_parser_non_constant_expression ("an increment"); | |
3684 | parser->non_constant_expression_p = true; | |
3685 | } | |
34cd5ae7 | 3686 | /* Generate a representation for the complete expression. */ |
a723baf1 MM |
3687 | postfix_expression |
3688 | = finish_increment_expr (postfix_expression, | |
3689 | POSTINCREMENT_EXPR); | |
b3445994 | 3690 | idk = CP_ID_KIND_NONE; |
a723baf1 MM |
3691 | break; |
3692 | ||
3693 | case CPP_MINUS_MINUS: | |
3694 | /* postfix-expression -- */ | |
3695 | /* Consume the `--' token. */ | |
3696 | cp_lexer_consume_token (parser->lexer); | |
14d22dd6 MM |
3697 | /* Decrements may not appear in constant-expressions. */ |
3698 | if (parser->constant_expression_p) | |
3699 | { | |
3700 | if (!parser->allow_non_constant_expression_p) | |
3701 | return cp_parser_non_constant_expression ("a decrement"); | |
3702 | parser->non_constant_expression_p = true; | |
3703 | } | |
34cd5ae7 | 3704 | /* Generate a representation for the complete expression. */ |
a723baf1 MM |
3705 | postfix_expression |
3706 | = finish_increment_expr (postfix_expression, | |
3707 | POSTDECREMENT_EXPR); | |
b3445994 | 3708 | idk = CP_ID_KIND_NONE; |
a723baf1 MM |
3709 | break; |
3710 | ||
3711 | default: | |
3712 | return postfix_expression; | |
3713 | } | |
3714 | } | |
3715 | ||
3716 | /* We should never get here. */ | |
3717 | abort (); | |
3718 | return error_mark_node; | |
3719 | } | |
3720 | ||
7efa3e22 | 3721 | /* Parse a parenthesized expression-list. |
a723baf1 MM |
3722 | |
3723 | expression-list: | |
3724 | assignment-expression | |
3725 | expression-list, assignment-expression | |
3726 | ||
7efa3e22 NS |
3727 | attribute-list: |
3728 | expression-list | |
3729 | identifier | |
3730 | identifier, expression-list | |
3731 | ||
a723baf1 MM |
3732 | Returns a TREE_LIST. The TREE_VALUE of each node is a |
3733 | representation of an assignment-expression. Note that a TREE_LIST | |
7efa3e22 NS |
3734 | is returned even if there is only a single expression in the list. |
3735 | error_mark_node is returned if the ( and or ) are | |
3736 | missing. NULL_TREE is returned on no expressions. The parentheses | |
3737 | are eaten. IS_ATTRIBUTE_LIST is true if this is really an attribute | |
39703eb9 MM |
3738 | list being parsed. If NON_CONSTANT_P is non-NULL, *NON_CONSTANT_P |
3739 | indicates whether or not all of the expressions in the list were | |
3740 | constant. */ | |
a723baf1 MM |
3741 | |
3742 | static tree | |
39703eb9 MM |
3743 | cp_parser_parenthesized_expression_list (cp_parser* parser, |
3744 | bool is_attribute_list, | |
3745 | bool *non_constant_p) | |
a723baf1 MM |
3746 | { |
3747 | tree expression_list = NULL_TREE; | |
7efa3e22 | 3748 | tree identifier = NULL_TREE; |
39703eb9 MM |
3749 | |
3750 | /* Assume all the expressions will be constant. */ | |
3751 | if (non_constant_p) | |
3752 | *non_constant_p = false; | |
3753 | ||
7efa3e22 NS |
3754 | if (!cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) |
3755 | return error_mark_node; | |
3756 | ||
a723baf1 | 3757 | /* Consume expressions until there are no more. */ |
7efa3e22 NS |
3758 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_PAREN)) |
3759 | while (true) | |
3760 | { | |
3761 | tree expr; | |
3762 | ||
3763 | /* At the beginning of attribute lists, check to see if the | |
3764 | next token is an identifier. */ | |
3765 | if (is_attribute_list | |
3766 | && cp_lexer_peek_token (parser->lexer)->type == CPP_NAME) | |
3767 | { | |
3768 | cp_token *token; | |
3769 | ||
3770 | /* Consume the identifier. */ | |
3771 | token = cp_lexer_consume_token (parser->lexer); | |
3772 | /* Save the identifier. */ | |
3773 | identifier = token->value; | |
3774 | } | |
3775 | else | |
3776 | { | |
3777 | /* Parse the next assignment-expression. */ | |
39703eb9 MM |
3778 | if (non_constant_p) |
3779 | { | |
3780 | bool expr_non_constant_p; | |
3781 | expr = (cp_parser_constant_expression | |
3782 | (parser, /*allow_non_constant_p=*/true, | |
3783 | &expr_non_constant_p)); | |
3784 | if (expr_non_constant_p) | |
3785 | *non_constant_p = true; | |
3786 | } | |
3787 | else | |
3788 | expr = cp_parser_assignment_expression (parser); | |
a723baf1 | 3789 | |
7efa3e22 NS |
3790 | /* Add it to the list. We add error_mark_node |
3791 | expressions to the list, so that we can still tell if | |
3792 | the correct form for a parenthesized expression-list | |
3793 | is found. That gives better errors. */ | |
3794 | expression_list = tree_cons (NULL_TREE, expr, expression_list); | |
a723baf1 | 3795 | |
7efa3e22 NS |
3796 | if (expr == error_mark_node) |
3797 | goto skip_comma; | |
3798 | } | |
a723baf1 | 3799 | |
7efa3e22 NS |
3800 | /* After the first item, attribute lists look the same as |
3801 | expression lists. */ | |
3802 | is_attribute_list = false; | |
3803 | ||
3804 | get_comma:; | |
3805 | /* If the next token isn't a `,', then we are done. */ | |
3806 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
3807 | break; | |
3808 | ||
3809 | /* Otherwise, consume the `,' and keep going. */ | |
3810 | cp_lexer_consume_token (parser->lexer); | |
3811 | } | |
3812 | ||
3813 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
3814 | { | |
3815 | int ending; | |
3816 | ||
3817 | skip_comma:; | |
3818 | /* We try and resync to an unnested comma, as that will give the | |
3819 | user better diagnostics. */ | |
3820 | ending = cp_parser_skip_to_closing_parenthesis (parser, true, true); | |
3821 | if (ending < 0) | |
3822 | goto get_comma; | |
3823 | if (!ending) | |
3824 | return error_mark_node; | |
a723baf1 MM |
3825 | } |
3826 | ||
3827 | /* We built up the list in reverse order so we must reverse it now. */ | |
7efa3e22 NS |
3828 | expression_list = nreverse (expression_list); |
3829 | if (identifier) | |
3830 | expression_list = tree_cons (NULL_TREE, identifier, expression_list); | |
3831 | ||
3832 | return expression_list; | |
a723baf1 MM |
3833 | } |
3834 | ||
3835 | /* Parse a pseudo-destructor-name. | |
3836 | ||
3837 | pseudo-destructor-name: | |
3838 | :: [opt] nested-name-specifier [opt] type-name :: ~ type-name | |
3839 | :: [opt] nested-name-specifier template template-id :: ~ type-name | |
3840 | :: [opt] nested-name-specifier [opt] ~ type-name | |
3841 | ||
3842 | If either of the first two productions is used, sets *SCOPE to the | |
3843 | TYPE specified before the final `::'. Otherwise, *SCOPE is set to | |
3844 | NULL_TREE. *TYPE is set to the TYPE_DECL for the final type-name, | |
3845 | or ERROR_MARK_NODE if no type-name is present. */ | |
3846 | ||
3847 | static void | |
94edc4ab NN |
3848 | cp_parser_pseudo_destructor_name (cp_parser* parser, |
3849 | tree* scope, | |
3850 | tree* type) | |
a723baf1 MM |
3851 | { |
3852 | bool nested_name_specifier_p; | |
3853 | ||
3854 | /* Look for the optional `::' operator. */ | |
3855 | cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/true); | |
3856 | /* Look for the optional nested-name-specifier. */ | |
3857 | nested_name_specifier_p | |
3858 | = (cp_parser_nested_name_specifier_opt (parser, | |
3859 | /*typename_keyword_p=*/false, | |
3860 | /*check_dependency_p=*/true, | |
3861 | /*type_p=*/false) | |
3862 | != NULL_TREE); | |
3863 | /* Now, if we saw a nested-name-specifier, we might be doing the | |
3864 | second production. */ | |
3865 | if (nested_name_specifier_p | |
3866 | && cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
3867 | { | |
3868 | /* Consume the `template' keyword. */ | |
3869 | cp_lexer_consume_token (parser->lexer); | |
3870 | /* Parse the template-id. */ | |
3871 | cp_parser_template_id (parser, | |
3872 | /*template_keyword_p=*/true, | |
3873 | /*check_dependency_p=*/false); | |
3874 | /* Look for the `::' token. */ | |
3875 | cp_parser_require (parser, CPP_SCOPE, "`::'"); | |
3876 | } | |
3877 | /* If the next token is not a `~', then there might be some | |
9bcb9aae | 3878 | additional qualification. */ |
a723baf1 MM |
3879 | else if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMPL)) |
3880 | { | |
3881 | /* Look for the type-name. */ | |
3882 | *scope = TREE_TYPE (cp_parser_type_name (parser)); | |
3883 | /* Look for the `::' token. */ | |
3884 | cp_parser_require (parser, CPP_SCOPE, "`::'"); | |
3885 | } | |
3886 | else | |
3887 | *scope = NULL_TREE; | |
3888 | ||
3889 | /* Look for the `~'. */ | |
3890 | cp_parser_require (parser, CPP_COMPL, "`~'"); | |
3891 | /* Look for the type-name again. We are not responsible for | |
3892 | checking that it matches the first type-name. */ | |
3893 | *type = cp_parser_type_name (parser); | |
3894 | } | |
3895 | ||
3896 | /* Parse a unary-expression. | |
3897 | ||
3898 | unary-expression: | |
3899 | postfix-expression | |
3900 | ++ cast-expression | |
3901 | -- cast-expression | |
3902 | unary-operator cast-expression | |
3903 | sizeof unary-expression | |
3904 | sizeof ( type-id ) | |
3905 | new-expression | |
3906 | delete-expression | |
3907 | ||
3908 | GNU Extensions: | |
3909 | ||
3910 | unary-expression: | |
3911 | __extension__ cast-expression | |
3912 | __alignof__ unary-expression | |
3913 | __alignof__ ( type-id ) | |
3914 | __real__ cast-expression | |
3915 | __imag__ cast-expression | |
3916 | && identifier | |
3917 | ||
3918 | ADDRESS_P is true iff the unary-expression is appearing as the | |
3919 | operand of the `&' operator. | |
3920 | ||
34cd5ae7 | 3921 | Returns a representation of the expression. */ |
a723baf1 MM |
3922 | |
3923 | static tree | |
3924 | cp_parser_unary_expression (cp_parser *parser, bool address_p) | |
3925 | { | |
3926 | cp_token *token; | |
3927 | enum tree_code unary_operator; | |
3928 | ||
3929 | /* Peek at the next token. */ | |
3930 | token = cp_lexer_peek_token (parser->lexer); | |
3931 | /* Some keywords give away the kind of expression. */ | |
3932 | if (token->type == CPP_KEYWORD) | |
3933 | { | |
3934 | enum rid keyword = token->keyword; | |
3935 | ||
3936 | switch (keyword) | |
3937 | { | |
3938 | case RID_ALIGNOF: | |
3939 | { | |
3940 | /* Consume the `alignof' token. */ | |
3941 | cp_lexer_consume_token (parser->lexer); | |
3942 | /* Parse the operand. */ | |
3943 | return finish_alignof (cp_parser_sizeof_operand | |
3944 | (parser, keyword)); | |
3945 | } | |
3946 | ||
3947 | case RID_SIZEOF: | |
3948 | { | |
3949 | tree operand; | |
3950 | ||
9bcb9aae | 3951 | /* Consume the `sizeof' token. */ |
a723baf1 MM |
3952 | cp_lexer_consume_token (parser->lexer); |
3953 | /* Parse the operand. */ | |
3954 | operand = cp_parser_sizeof_operand (parser, keyword); | |
3955 | ||
3956 | /* If the type of the operand cannot be determined build a | |
3957 | SIZEOF_EXPR. */ | |
3958 | if (TYPE_P (operand) | |
1fb3244a MM |
3959 | ? dependent_type_p (operand) |
3960 | : type_dependent_expression_p (operand)) | |
a723baf1 MM |
3961 | return build_min (SIZEOF_EXPR, size_type_node, operand); |
3962 | /* Otherwise, compute the constant value. */ | |
3963 | else | |
3964 | return finish_sizeof (operand); | |
3965 | } | |
3966 | ||
3967 | case RID_NEW: | |
3968 | return cp_parser_new_expression (parser); | |
3969 | ||
3970 | case RID_DELETE: | |
3971 | return cp_parser_delete_expression (parser); | |
3972 | ||
3973 | case RID_EXTENSION: | |
3974 | { | |
3975 | /* The saved value of the PEDANTIC flag. */ | |
3976 | int saved_pedantic; | |
3977 | tree expr; | |
3978 | ||
3979 | /* Save away the PEDANTIC flag. */ | |
3980 | cp_parser_extension_opt (parser, &saved_pedantic); | |
3981 | /* Parse the cast-expression. */ | |
d6b4ea85 | 3982 | expr = cp_parser_simple_cast_expression (parser); |
a723baf1 MM |
3983 | /* Restore the PEDANTIC flag. */ |
3984 | pedantic = saved_pedantic; | |
3985 | ||
3986 | return expr; | |
3987 | } | |
3988 | ||
3989 | case RID_REALPART: | |
3990 | case RID_IMAGPART: | |
3991 | { | |
3992 | tree expression; | |
3993 | ||
3994 | /* Consume the `__real__' or `__imag__' token. */ | |
3995 | cp_lexer_consume_token (parser->lexer); | |
3996 | /* Parse the cast-expression. */ | |
d6b4ea85 | 3997 | expression = cp_parser_simple_cast_expression (parser); |
a723baf1 MM |
3998 | /* Create the complete representation. */ |
3999 | return build_x_unary_op ((keyword == RID_REALPART | |
4000 | ? REALPART_EXPR : IMAGPART_EXPR), | |
4001 | expression); | |
4002 | } | |
4003 | break; | |
4004 | ||
4005 | default: | |
4006 | break; | |
4007 | } | |
4008 | } | |
4009 | ||
4010 | /* Look for the `:: new' and `:: delete', which also signal the | |
4011 | beginning of a new-expression, or delete-expression, | |
4012 | respectively. If the next token is `::', then it might be one of | |
4013 | these. */ | |
4014 | if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
4015 | { | |
4016 | enum rid keyword; | |
4017 | ||
4018 | /* See if the token after the `::' is one of the keywords in | |
4019 | which we're interested. */ | |
4020 | keyword = cp_lexer_peek_nth_token (parser->lexer, 2)->keyword; | |
4021 | /* If it's `new', we have a new-expression. */ | |
4022 | if (keyword == RID_NEW) | |
4023 | return cp_parser_new_expression (parser); | |
4024 | /* Similarly, for `delete'. */ | |
4025 | else if (keyword == RID_DELETE) | |
4026 | return cp_parser_delete_expression (parser); | |
4027 | } | |
4028 | ||
4029 | /* Look for a unary operator. */ | |
4030 | unary_operator = cp_parser_unary_operator (token); | |
4031 | /* The `++' and `--' operators can be handled similarly, even though | |
4032 | they are not technically unary-operators in the grammar. */ | |
4033 | if (unary_operator == ERROR_MARK) | |
4034 | { | |
4035 | if (token->type == CPP_PLUS_PLUS) | |
4036 | unary_operator = PREINCREMENT_EXPR; | |
4037 | else if (token->type == CPP_MINUS_MINUS) | |
4038 | unary_operator = PREDECREMENT_EXPR; | |
4039 | /* Handle the GNU address-of-label extension. */ | |
4040 | else if (cp_parser_allow_gnu_extensions_p (parser) | |
4041 | && token->type == CPP_AND_AND) | |
4042 | { | |
4043 | tree identifier; | |
4044 | ||
4045 | /* Consume the '&&' token. */ | |
4046 | cp_lexer_consume_token (parser->lexer); | |
4047 | /* Look for the identifier. */ | |
4048 | identifier = cp_parser_identifier (parser); | |
4049 | /* Create an expression representing the address. */ | |
4050 | return finish_label_address_expr (identifier); | |
4051 | } | |
4052 | } | |
4053 | if (unary_operator != ERROR_MARK) | |
4054 | { | |
4055 | tree cast_expression; | |
4056 | ||
4057 | /* Consume the operator token. */ | |
4058 | token = cp_lexer_consume_token (parser->lexer); | |
4059 | /* Parse the cast-expression. */ | |
4060 | cast_expression | |
4061 | = cp_parser_cast_expression (parser, unary_operator == ADDR_EXPR); | |
4062 | /* Now, build an appropriate representation. */ | |
4063 | switch (unary_operator) | |
4064 | { | |
4065 | case INDIRECT_REF: | |
4066 | return build_x_indirect_ref (cast_expression, "unary *"); | |
4067 | ||
4068 | case ADDR_EXPR: | |
d17811fd MM |
4069 | case BIT_NOT_EXPR: |
4070 | return build_x_unary_op (unary_operator, cast_expression); | |
a723baf1 | 4071 | |
14d22dd6 MM |
4072 | case PREINCREMENT_EXPR: |
4073 | case PREDECREMENT_EXPR: | |
4074 | if (parser->constant_expression_p) | |
4075 | { | |
4076 | if (!parser->allow_non_constant_expression_p) | |
4077 | return cp_parser_non_constant_expression (PREINCREMENT_EXPR | |
4078 | ? "an increment" | |
4079 | : "a decrement"); | |
4080 | parser->non_constant_expression_p = true; | |
4081 | } | |
4082 | /* Fall through. */ | |
a723baf1 MM |
4083 | case CONVERT_EXPR: |
4084 | case NEGATE_EXPR: | |
4085 | case TRUTH_NOT_EXPR: | |
a723baf1 MM |
4086 | return finish_unary_op_expr (unary_operator, cast_expression); |
4087 | ||
a723baf1 MM |
4088 | default: |
4089 | abort (); | |
4090 | return error_mark_node; | |
4091 | } | |
4092 | } | |
4093 | ||
4094 | return cp_parser_postfix_expression (parser, address_p); | |
4095 | } | |
4096 | ||
4097 | /* Returns ERROR_MARK if TOKEN is not a unary-operator. If TOKEN is a | |
4098 | unary-operator, the corresponding tree code is returned. */ | |
4099 | ||
4100 | static enum tree_code | |
94edc4ab | 4101 | cp_parser_unary_operator (cp_token* token) |
a723baf1 MM |
4102 | { |
4103 | switch (token->type) | |
4104 | { | |
4105 | case CPP_MULT: | |
4106 | return INDIRECT_REF; | |
4107 | ||
4108 | case CPP_AND: | |
4109 | return ADDR_EXPR; | |
4110 | ||
4111 | case CPP_PLUS: | |
4112 | return CONVERT_EXPR; | |
4113 | ||
4114 | case CPP_MINUS: | |
4115 | return NEGATE_EXPR; | |
4116 | ||
4117 | case CPP_NOT: | |
4118 | return TRUTH_NOT_EXPR; | |
4119 | ||
4120 | case CPP_COMPL: | |
4121 | return BIT_NOT_EXPR; | |
4122 | ||
4123 | default: | |
4124 | return ERROR_MARK; | |
4125 | } | |
4126 | } | |
4127 | ||
4128 | /* Parse a new-expression. | |
4129 | ||
ca099ac8 | 4130 | new-expression: |
a723baf1 MM |
4131 | :: [opt] new new-placement [opt] new-type-id new-initializer [opt] |
4132 | :: [opt] new new-placement [opt] ( type-id ) new-initializer [opt] | |
4133 | ||
4134 | Returns a representation of the expression. */ | |
4135 | ||
4136 | static tree | |
94edc4ab | 4137 | cp_parser_new_expression (cp_parser* parser) |
a723baf1 MM |
4138 | { |
4139 | bool global_scope_p; | |
4140 | tree placement; | |
4141 | tree type; | |
4142 | tree initializer; | |
4143 | ||
4144 | /* Look for the optional `::' operator. */ | |
4145 | global_scope_p | |
4146 | = (cp_parser_global_scope_opt (parser, | |
4147 | /*current_scope_valid_p=*/false) | |
4148 | != NULL_TREE); | |
4149 | /* Look for the `new' operator. */ | |
4150 | cp_parser_require_keyword (parser, RID_NEW, "`new'"); | |
4151 | /* There's no easy way to tell a new-placement from the | |
4152 | `( type-id )' construct. */ | |
4153 | cp_parser_parse_tentatively (parser); | |
4154 | /* Look for a new-placement. */ | |
4155 | placement = cp_parser_new_placement (parser); | |
4156 | /* If that didn't work out, there's no new-placement. */ | |
4157 | if (!cp_parser_parse_definitely (parser)) | |
4158 | placement = NULL_TREE; | |
4159 | ||
4160 | /* If the next token is a `(', then we have a parenthesized | |
4161 | type-id. */ | |
4162 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
4163 | { | |
4164 | /* Consume the `('. */ | |
4165 | cp_lexer_consume_token (parser->lexer); | |
4166 | /* Parse the type-id. */ | |
4167 | type = cp_parser_type_id (parser); | |
4168 | /* Look for the closing `)'. */ | |
4169 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
4170 | } | |
4171 | /* Otherwise, there must be a new-type-id. */ | |
4172 | else | |
4173 | type = cp_parser_new_type_id (parser); | |
4174 | ||
4175 | /* If the next token is a `(', then we have a new-initializer. */ | |
4176 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
4177 | initializer = cp_parser_new_initializer (parser); | |
4178 | else | |
4179 | initializer = NULL_TREE; | |
4180 | ||
4181 | /* Create a representation of the new-expression. */ | |
4182 | return build_new (placement, type, initializer, global_scope_p); | |
4183 | } | |
4184 | ||
4185 | /* Parse a new-placement. | |
4186 | ||
4187 | new-placement: | |
4188 | ( expression-list ) | |
4189 | ||
4190 | Returns the same representation as for an expression-list. */ | |
4191 | ||
4192 | static tree | |
94edc4ab | 4193 | cp_parser_new_placement (cp_parser* parser) |
a723baf1 MM |
4194 | { |
4195 | tree expression_list; | |
4196 | ||
a723baf1 | 4197 | /* Parse the expression-list. */ |
39703eb9 MM |
4198 | expression_list = (cp_parser_parenthesized_expression_list |
4199 | (parser, false, /*non_constant_p=*/NULL)); | |
a723baf1 MM |
4200 | |
4201 | return expression_list; | |
4202 | } | |
4203 | ||
4204 | /* Parse a new-type-id. | |
4205 | ||
4206 | new-type-id: | |
4207 | type-specifier-seq new-declarator [opt] | |
4208 | ||
4209 | Returns a TREE_LIST whose TREE_PURPOSE is the type-specifier-seq, | |
4210 | and whose TREE_VALUE is the new-declarator. */ | |
4211 | ||
4212 | static tree | |
94edc4ab | 4213 | cp_parser_new_type_id (cp_parser* parser) |
a723baf1 MM |
4214 | { |
4215 | tree type_specifier_seq; | |
4216 | tree declarator; | |
4217 | const char *saved_message; | |
4218 | ||
4219 | /* The type-specifier sequence must not contain type definitions. | |
4220 | (It cannot contain declarations of new types either, but if they | |
4221 | are not definitions we will catch that because they are not | |
4222 | complete.) */ | |
4223 | saved_message = parser->type_definition_forbidden_message; | |
4224 | parser->type_definition_forbidden_message | |
4225 | = "types may not be defined in a new-type-id"; | |
4226 | /* Parse the type-specifier-seq. */ | |
4227 | type_specifier_seq = cp_parser_type_specifier_seq (parser); | |
4228 | /* Restore the old message. */ | |
4229 | parser->type_definition_forbidden_message = saved_message; | |
4230 | /* Parse the new-declarator. */ | |
4231 | declarator = cp_parser_new_declarator_opt (parser); | |
4232 | ||
4233 | return build_tree_list (type_specifier_seq, declarator); | |
4234 | } | |
4235 | ||
4236 | /* Parse an (optional) new-declarator. | |
4237 | ||
4238 | new-declarator: | |
4239 | ptr-operator new-declarator [opt] | |
4240 | direct-new-declarator | |
4241 | ||
4242 | Returns a representation of the declarator. See | |
4243 | cp_parser_declarator for the representations used. */ | |
4244 | ||
4245 | static tree | |
94edc4ab | 4246 | cp_parser_new_declarator_opt (cp_parser* parser) |
a723baf1 MM |
4247 | { |
4248 | enum tree_code code; | |
4249 | tree type; | |
4250 | tree cv_qualifier_seq; | |
4251 | ||
4252 | /* We don't know if there's a ptr-operator next, or not. */ | |
4253 | cp_parser_parse_tentatively (parser); | |
4254 | /* Look for a ptr-operator. */ | |
4255 | code = cp_parser_ptr_operator (parser, &type, &cv_qualifier_seq); | |
4256 | /* If that worked, look for more new-declarators. */ | |
4257 | if (cp_parser_parse_definitely (parser)) | |
4258 | { | |
4259 | tree declarator; | |
4260 | ||
4261 | /* Parse another optional declarator. */ | |
4262 | declarator = cp_parser_new_declarator_opt (parser); | |
4263 | ||
4264 | /* Create the representation of the declarator. */ | |
4265 | if (code == INDIRECT_REF) | |
4266 | declarator = make_pointer_declarator (cv_qualifier_seq, | |
4267 | declarator); | |
4268 | else | |
4269 | declarator = make_reference_declarator (cv_qualifier_seq, | |
4270 | declarator); | |
4271 | ||
4272 | /* Handle the pointer-to-member case. */ | |
4273 | if (type) | |
4274 | declarator = build_nt (SCOPE_REF, type, declarator); | |
4275 | ||
4276 | return declarator; | |
4277 | } | |
4278 | ||
4279 | /* If the next token is a `[', there is a direct-new-declarator. */ | |
4280 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE)) | |
4281 | return cp_parser_direct_new_declarator (parser); | |
4282 | ||
4283 | return NULL_TREE; | |
4284 | } | |
4285 | ||
4286 | /* Parse a direct-new-declarator. | |
4287 | ||
4288 | direct-new-declarator: | |
4289 | [ expression ] | |
4290 | direct-new-declarator [constant-expression] | |
4291 | ||
4292 | Returns an ARRAY_REF, following the same conventions as are | |
4293 | documented for cp_parser_direct_declarator. */ | |
4294 | ||
4295 | static tree | |
94edc4ab | 4296 | cp_parser_direct_new_declarator (cp_parser* parser) |
a723baf1 MM |
4297 | { |
4298 | tree declarator = NULL_TREE; | |
4299 | ||
4300 | while (true) | |
4301 | { | |
4302 | tree expression; | |
4303 | ||
4304 | /* Look for the opening `['. */ | |
4305 | cp_parser_require (parser, CPP_OPEN_SQUARE, "`['"); | |
4306 | /* The first expression is not required to be constant. */ | |
4307 | if (!declarator) | |
4308 | { | |
4309 | expression = cp_parser_expression (parser); | |
4310 | /* The standard requires that the expression have integral | |
4311 | type. DR 74 adds enumeration types. We believe that the | |
4312 | real intent is that these expressions be handled like the | |
4313 | expression in a `switch' condition, which also allows | |
4314 | classes with a single conversion to integral or | |
4315 | enumeration type. */ | |
4316 | if (!processing_template_decl) | |
4317 | { | |
4318 | expression | |
4319 | = build_expr_type_conversion (WANT_INT | WANT_ENUM, | |
4320 | expression, | |
b746c5dc | 4321 | /*complain=*/true); |
a723baf1 MM |
4322 | if (!expression) |
4323 | { | |
4324 | error ("expression in new-declarator must have integral or enumeration type"); | |
4325 | expression = error_mark_node; | |
4326 | } | |
4327 | } | |
4328 | } | |
4329 | /* But all the other expressions must be. */ | |
4330 | else | |
14d22dd6 MM |
4331 | expression |
4332 | = cp_parser_constant_expression (parser, | |
4333 | /*allow_non_constant=*/false, | |
4334 | NULL); | |
a723baf1 MM |
4335 | /* Look for the closing `]'. */ |
4336 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
4337 | ||
4338 | /* Add this bound to the declarator. */ | |
4339 | declarator = build_nt (ARRAY_REF, declarator, expression); | |
4340 | ||
4341 | /* If the next token is not a `[', then there are no more | |
4342 | bounds. */ | |
4343 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_SQUARE)) | |
4344 | break; | |
4345 | } | |
4346 | ||
4347 | return declarator; | |
4348 | } | |
4349 | ||
4350 | /* Parse a new-initializer. | |
4351 | ||
4352 | new-initializer: | |
4353 | ( expression-list [opt] ) | |
4354 | ||
34cd5ae7 | 4355 | Returns a representation of the expression-list. If there is no |
a723baf1 MM |
4356 | expression-list, VOID_ZERO_NODE is returned. */ |
4357 | ||
4358 | static tree | |
94edc4ab | 4359 | cp_parser_new_initializer (cp_parser* parser) |
a723baf1 MM |
4360 | { |
4361 | tree expression_list; | |
4362 | ||
39703eb9 MM |
4363 | expression_list = (cp_parser_parenthesized_expression_list |
4364 | (parser, false, /*non_constant_p=*/NULL)); | |
7efa3e22 | 4365 | if (!expression_list) |
a723baf1 | 4366 | expression_list = void_zero_node; |
a723baf1 MM |
4367 | |
4368 | return expression_list; | |
4369 | } | |
4370 | ||
4371 | /* Parse a delete-expression. | |
4372 | ||
4373 | delete-expression: | |
4374 | :: [opt] delete cast-expression | |
4375 | :: [opt] delete [ ] cast-expression | |
4376 | ||
4377 | Returns a representation of the expression. */ | |
4378 | ||
4379 | static tree | |
94edc4ab | 4380 | cp_parser_delete_expression (cp_parser* parser) |
a723baf1 MM |
4381 | { |
4382 | bool global_scope_p; | |
4383 | bool array_p; | |
4384 | tree expression; | |
4385 | ||
4386 | /* Look for the optional `::' operator. */ | |
4387 | global_scope_p | |
4388 | = (cp_parser_global_scope_opt (parser, | |
4389 | /*current_scope_valid_p=*/false) | |
4390 | != NULL_TREE); | |
4391 | /* Look for the `delete' keyword. */ | |
4392 | cp_parser_require_keyword (parser, RID_DELETE, "`delete'"); | |
4393 | /* See if the array syntax is in use. */ | |
4394 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE)) | |
4395 | { | |
4396 | /* Consume the `[' token. */ | |
4397 | cp_lexer_consume_token (parser->lexer); | |
4398 | /* Look for the `]' token. */ | |
4399 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
4400 | /* Remember that this is the `[]' construct. */ | |
4401 | array_p = true; | |
4402 | } | |
4403 | else | |
4404 | array_p = false; | |
4405 | ||
4406 | /* Parse the cast-expression. */ | |
d6b4ea85 | 4407 | expression = cp_parser_simple_cast_expression (parser); |
a723baf1 MM |
4408 | |
4409 | return delete_sanity (expression, NULL_TREE, array_p, global_scope_p); | |
4410 | } | |
4411 | ||
4412 | /* Parse a cast-expression. | |
4413 | ||
4414 | cast-expression: | |
4415 | unary-expression | |
4416 | ( type-id ) cast-expression | |
4417 | ||
4418 | Returns a representation of the expression. */ | |
4419 | ||
4420 | static tree | |
4421 | cp_parser_cast_expression (cp_parser *parser, bool address_p) | |
4422 | { | |
4423 | /* If it's a `(', then we might be looking at a cast. */ | |
4424 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
4425 | { | |
4426 | tree type = NULL_TREE; | |
4427 | tree expr = NULL_TREE; | |
4428 | bool compound_literal_p; | |
4429 | const char *saved_message; | |
4430 | ||
4431 | /* There's no way to know yet whether or not this is a cast. | |
4432 | For example, `(int (3))' is a unary-expression, while `(int) | |
4433 | 3' is a cast. So, we resort to parsing tentatively. */ | |
4434 | cp_parser_parse_tentatively (parser); | |
4435 | /* Types may not be defined in a cast. */ | |
4436 | saved_message = parser->type_definition_forbidden_message; | |
4437 | parser->type_definition_forbidden_message | |
4438 | = "types may not be defined in casts"; | |
4439 | /* Consume the `('. */ | |
4440 | cp_lexer_consume_token (parser->lexer); | |
4441 | /* A very tricky bit is that `(struct S) { 3 }' is a | |
4442 | compound-literal (which we permit in C++ as an extension). | |
4443 | But, that construct is not a cast-expression -- it is a | |
4444 | postfix-expression. (The reason is that `(struct S) { 3 }.i' | |
4445 | is legal; if the compound-literal were a cast-expression, | |
4446 | you'd need an extra set of parentheses.) But, if we parse | |
4447 | the type-id, and it happens to be a class-specifier, then we | |
4448 | will commit to the parse at that point, because we cannot | |
4449 | undo the action that is done when creating a new class. So, | |
4450 | then we cannot back up and do a postfix-expression. | |
4451 | ||
4452 | Therefore, we scan ahead to the closing `)', and check to see | |
4453 | if the token after the `)' is a `{'. If so, we are not | |
4454 | looking at a cast-expression. | |
4455 | ||
4456 | Save tokens so that we can put them back. */ | |
4457 | cp_lexer_save_tokens (parser->lexer); | |
4458 | /* Skip tokens until the next token is a closing parenthesis. | |
4459 | If we find the closing `)', and the next token is a `{', then | |
4460 | we are looking at a compound-literal. */ | |
4461 | compound_literal_p | |
7efa3e22 | 4462 | = (cp_parser_skip_to_closing_parenthesis (parser, false, false) |
a723baf1 MM |
4463 | && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)); |
4464 | /* Roll back the tokens we skipped. */ | |
4465 | cp_lexer_rollback_tokens (parser->lexer); | |
4466 | /* If we were looking at a compound-literal, simulate an error | |
4467 | so that the call to cp_parser_parse_definitely below will | |
4468 | fail. */ | |
4469 | if (compound_literal_p) | |
4470 | cp_parser_simulate_error (parser); | |
4471 | else | |
4472 | { | |
4473 | /* Look for the type-id. */ | |
4474 | type = cp_parser_type_id (parser); | |
4475 | /* Look for the closing `)'. */ | |
4476 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
4477 | } | |
4478 | ||
4479 | /* Restore the saved message. */ | |
4480 | parser->type_definition_forbidden_message = saved_message; | |
4481 | ||
bbaab916 NS |
4482 | /* If ok so far, parse the dependent expression. We cannot be |
4483 | sure it is a cast. Consider `(T ())'. It is a parenthesized | |
4484 | ctor of T, but looks like a cast to function returning T | |
4485 | without a dependent expression. */ | |
4486 | if (!cp_parser_error_occurred (parser)) | |
d6b4ea85 | 4487 | expr = cp_parser_simple_cast_expression (parser); |
bbaab916 | 4488 | |
a723baf1 MM |
4489 | if (cp_parser_parse_definitely (parser)) |
4490 | { | |
a723baf1 MM |
4491 | /* Warn about old-style casts, if so requested. */ |
4492 | if (warn_old_style_cast | |
4493 | && !in_system_header | |
4494 | && !VOID_TYPE_P (type) | |
4495 | && current_lang_name != lang_name_c) | |
4496 | warning ("use of old-style cast"); | |
14d22dd6 MM |
4497 | |
4498 | /* Only type conversions to integral or enumeration types | |
4499 | can be used in constant-expressions. */ | |
4500 | if (parser->constant_expression_p | |
4501 | && !dependent_type_p (type) | |
4502 | && !INTEGRAL_OR_ENUMERATION_TYPE_P (type)) | |
4503 | { | |
4504 | if (!parser->allow_non_constant_expression_p) | |
4505 | return (cp_parser_non_constant_expression | |
4506 | ("a casts to a type other than an integral or " | |
4507 | "enumeration type")); | |
4508 | parser->non_constant_expression_p = true; | |
4509 | } | |
a723baf1 MM |
4510 | /* Perform the cast. */ |
4511 | expr = build_c_cast (type, expr); | |
bbaab916 | 4512 | return expr; |
a723baf1 | 4513 | } |
a723baf1 MM |
4514 | } |
4515 | ||
4516 | /* If we get here, then it's not a cast, so it must be a | |
4517 | unary-expression. */ | |
4518 | return cp_parser_unary_expression (parser, address_p); | |
4519 | } | |
4520 | ||
4521 | /* Parse a pm-expression. | |
4522 | ||
4523 | pm-expression: | |
4524 | cast-expression | |
4525 | pm-expression .* cast-expression | |
4526 | pm-expression ->* cast-expression | |
4527 | ||
4528 | Returns a representation of the expression. */ | |
4529 | ||
4530 | static tree | |
94edc4ab | 4531 | cp_parser_pm_expression (cp_parser* parser) |
a723baf1 | 4532 | { |
d6b4ea85 MM |
4533 | static const cp_parser_token_tree_map map = { |
4534 | { CPP_DEREF_STAR, MEMBER_REF }, | |
4535 | { CPP_DOT_STAR, DOTSTAR_EXPR }, | |
4536 | { CPP_EOF, ERROR_MARK } | |
4537 | }; | |
a723baf1 | 4538 | |
d6b4ea85 MM |
4539 | return cp_parser_binary_expression (parser, map, |
4540 | cp_parser_simple_cast_expression); | |
a723baf1 MM |
4541 | } |
4542 | ||
4543 | /* Parse a multiplicative-expression. | |
4544 | ||
4545 | mulitplicative-expression: | |
4546 | pm-expression | |
4547 | multiplicative-expression * pm-expression | |
4548 | multiplicative-expression / pm-expression | |
4549 | multiplicative-expression % pm-expression | |
4550 | ||
4551 | Returns a representation of the expression. */ | |
4552 | ||
4553 | static tree | |
94edc4ab | 4554 | cp_parser_multiplicative_expression (cp_parser* parser) |
a723baf1 | 4555 | { |
39b1af70 | 4556 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4557 | { CPP_MULT, MULT_EXPR }, |
4558 | { CPP_DIV, TRUNC_DIV_EXPR }, | |
4559 | { CPP_MOD, TRUNC_MOD_EXPR }, | |
4560 | { CPP_EOF, ERROR_MARK } | |
4561 | }; | |
4562 | ||
4563 | return cp_parser_binary_expression (parser, | |
4564 | map, | |
4565 | cp_parser_pm_expression); | |
4566 | } | |
4567 | ||
4568 | /* Parse an additive-expression. | |
4569 | ||
4570 | additive-expression: | |
4571 | multiplicative-expression | |
4572 | additive-expression + multiplicative-expression | |
4573 | additive-expression - multiplicative-expression | |
4574 | ||
4575 | Returns a representation of the expression. */ | |
4576 | ||
4577 | static tree | |
94edc4ab | 4578 | cp_parser_additive_expression (cp_parser* parser) |
a723baf1 | 4579 | { |
39b1af70 | 4580 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4581 | { CPP_PLUS, PLUS_EXPR }, |
4582 | { CPP_MINUS, MINUS_EXPR }, | |
4583 | { CPP_EOF, ERROR_MARK } | |
4584 | }; | |
4585 | ||
4586 | return cp_parser_binary_expression (parser, | |
4587 | map, | |
4588 | cp_parser_multiplicative_expression); | |
4589 | } | |
4590 | ||
4591 | /* Parse a shift-expression. | |
4592 | ||
4593 | shift-expression: | |
4594 | additive-expression | |
4595 | shift-expression << additive-expression | |
4596 | shift-expression >> additive-expression | |
4597 | ||
4598 | Returns a representation of the expression. */ | |
4599 | ||
4600 | static tree | |
94edc4ab | 4601 | cp_parser_shift_expression (cp_parser* parser) |
a723baf1 | 4602 | { |
39b1af70 | 4603 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4604 | { CPP_LSHIFT, LSHIFT_EXPR }, |
4605 | { CPP_RSHIFT, RSHIFT_EXPR }, | |
4606 | { CPP_EOF, ERROR_MARK } | |
4607 | }; | |
4608 | ||
4609 | return cp_parser_binary_expression (parser, | |
4610 | map, | |
4611 | cp_parser_additive_expression); | |
4612 | } | |
4613 | ||
4614 | /* Parse a relational-expression. | |
4615 | ||
4616 | relational-expression: | |
4617 | shift-expression | |
4618 | relational-expression < shift-expression | |
4619 | relational-expression > shift-expression | |
4620 | relational-expression <= shift-expression | |
4621 | relational-expression >= shift-expression | |
4622 | ||
4623 | GNU Extension: | |
4624 | ||
4625 | relational-expression: | |
4626 | relational-expression <? shift-expression | |
4627 | relational-expression >? shift-expression | |
4628 | ||
4629 | Returns a representation of the expression. */ | |
4630 | ||
4631 | static tree | |
94edc4ab | 4632 | cp_parser_relational_expression (cp_parser* parser) |
a723baf1 | 4633 | { |
39b1af70 | 4634 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4635 | { CPP_LESS, LT_EXPR }, |
4636 | { CPP_GREATER, GT_EXPR }, | |
4637 | { CPP_LESS_EQ, LE_EXPR }, | |
4638 | { CPP_GREATER_EQ, GE_EXPR }, | |
4639 | { CPP_MIN, MIN_EXPR }, | |
4640 | { CPP_MAX, MAX_EXPR }, | |
4641 | { CPP_EOF, ERROR_MARK } | |
4642 | }; | |
4643 | ||
4644 | return cp_parser_binary_expression (parser, | |
4645 | map, | |
4646 | cp_parser_shift_expression); | |
4647 | } | |
4648 | ||
4649 | /* Parse an equality-expression. | |
4650 | ||
4651 | equality-expression: | |
4652 | relational-expression | |
4653 | equality-expression == relational-expression | |
4654 | equality-expression != relational-expression | |
4655 | ||
4656 | Returns a representation of the expression. */ | |
4657 | ||
4658 | static tree | |
94edc4ab | 4659 | cp_parser_equality_expression (cp_parser* parser) |
a723baf1 | 4660 | { |
39b1af70 | 4661 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4662 | { CPP_EQ_EQ, EQ_EXPR }, |
4663 | { CPP_NOT_EQ, NE_EXPR }, | |
4664 | { CPP_EOF, ERROR_MARK } | |
4665 | }; | |
4666 | ||
4667 | return cp_parser_binary_expression (parser, | |
4668 | map, | |
4669 | cp_parser_relational_expression); | |
4670 | } | |
4671 | ||
4672 | /* Parse an and-expression. | |
4673 | ||
4674 | and-expression: | |
4675 | equality-expression | |
4676 | and-expression & equality-expression | |
4677 | ||
4678 | Returns a representation of the expression. */ | |
4679 | ||
4680 | static tree | |
94edc4ab | 4681 | cp_parser_and_expression (cp_parser* parser) |
a723baf1 | 4682 | { |
39b1af70 | 4683 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4684 | { CPP_AND, BIT_AND_EXPR }, |
4685 | { CPP_EOF, ERROR_MARK } | |
4686 | }; | |
4687 | ||
4688 | return cp_parser_binary_expression (parser, | |
4689 | map, | |
4690 | cp_parser_equality_expression); | |
4691 | } | |
4692 | ||
4693 | /* Parse an exclusive-or-expression. | |
4694 | ||
4695 | exclusive-or-expression: | |
4696 | and-expression | |
4697 | exclusive-or-expression ^ and-expression | |
4698 | ||
4699 | Returns a representation of the expression. */ | |
4700 | ||
4701 | static tree | |
94edc4ab | 4702 | cp_parser_exclusive_or_expression (cp_parser* parser) |
a723baf1 | 4703 | { |
39b1af70 | 4704 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4705 | { CPP_XOR, BIT_XOR_EXPR }, |
4706 | { CPP_EOF, ERROR_MARK } | |
4707 | }; | |
4708 | ||
4709 | return cp_parser_binary_expression (parser, | |
4710 | map, | |
4711 | cp_parser_and_expression); | |
4712 | } | |
4713 | ||
4714 | ||
4715 | /* Parse an inclusive-or-expression. | |
4716 | ||
4717 | inclusive-or-expression: | |
4718 | exclusive-or-expression | |
4719 | inclusive-or-expression | exclusive-or-expression | |
4720 | ||
4721 | Returns a representation of the expression. */ | |
4722 | ||
4723 | static tree | |
94edc4ab | 4724 | cp_parser_inclusive_or_expression (cp_parser* parser) |
a723baf1 | 4725 | { |
39b1af70 | 4726 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4727 | { CPP_OR, BIT_IOR_EXPR }, |
4728 | { CPP_EOF, ERROR_MARK } | |
4729 | }; | |
4730 | ||
4731 | return cp_parser_binary_expression (parser, | |
4732 | map, | |
4733 | cp_parser_exclusive_or_expression); | |
4734 | } | |
4735 | ||
4736 | /* Parse a logical-and-expression. | |
4737 | ||
4738 | logical-and-expression: | |
4739 | inclusive-or-expression | |
4740 | logical-and-expression && inclusive-or-expression | |
4741 | ||
4742 | Returns a representation of the expression. */ | |
4743 | ||
4744 | static tree | |
94edc4ab | 4745 | cp_parser_logical_and_expression (cp_parser* parser) |
a723baf1 | 4746 | { |
39b1af70 | 4747 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4748 | { CPP_AND_AND, TRUTH_ANDIF_EXPR }, |
4749 | { CPP_EOF, ERROR_MARK } | |
4750 | }; | |
4751 | ||
4752 | return cp_parser_binary_expression (parser, | |
4753 | map, | |
4754 | cp_parser_inclusive_or_expression); | |
4755 | } | |
4756 | ||
4757 | /* Parse a logical-or-expression. | |
4758 | ||
4759 | logical-or-expression: | |
34cd5ae7 | 4760 | logical-and-expression |
a723baf1 MM |
4761 | logical-or-expression || logical-and-expression |
4762 | ||
4763 | Returns a representation of the expression. */ | |
4764 | ||
4765 | static tree | |
94edc4ab | 4766 | cp_parser_logical_or_expression (cp_parser* parser) |
a723baf1 | 4767 | { |
39b1af70 | 4768 | static const cp_parser_token_tree_map map = { |
a723baf1 MM |
4769 | { CPP_OR_OR, TRUTH_ORIF_EXPR }, |
4770 | { CPP_EOF, ERROR_MARK } | |
4771 | }; | |
4772 | ||
4773 | return cp_parser_binary_expression (parser, | |
4774 | map, | |
4775 | cp_parser_logical_and_expression); | |
4776 | } | |
4777 | ||
a723baf1 MM |
4778 | /* Parse the `? expression : assignment-expression' part of a |
4779 | conditional-expression. The LOGICAL_OR_EXPR is the | |
4780 | logical-or-expression that started the conditional-expression. | |
4781 | Returns a representation of the entire conditional-expression. | |
4782 | ||
39703eb9 | 4783 | This routine is used by cp_parser_assignment_expression. |
a723baf1 MM |
4784 | |
4785 | ? expression : assignment-expression | |
4786 | ||
4787 | GNU Extensions: | |
4788 | ||
4789 | ? : assignment-expression */ | |
4790 | ||
4791 | static tree | |
94edc4ab | 4792 | cp_parser_question_colon_clause (cp_parser* parser, tree logical_or_expr) |
a723baf1 MM |
4793 | { |
4794 | tree expr; | |
4795 | tree assignment_expr; | |
4796 | ||
4797 | /* Consume the `?' token. */ | |
4798 | cp_lexer_consume_token (parser->lexer); | |
4799 | if (cp_parser_allow_gnu_extensions_p (parser) | |
4800 | && cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
4801 | /* Implicit true clause. */ | |
4802 | expr = NULL_TREE; | |
4803 | else | |
4804 | /* Parse the expression. */ | |
4805 | expr = cp_parser_expression (parser); | |
4806 | ||
4807 | /* The next token should be a `:'. */ | |
4808 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
4809 | /* Parse the assignment-expression. */ | |
4810 | assignment_expr = cp_parser_assignment_expression (parser); | |
4811 | ||
4812 | /* Build the conditional-expression. */ | |
4813 | return build_x_conditional_expr (logical_or_expr, | |
4814 | expr, | |
4815 | assignment_expr); | |
4816 | } | |
4817 | ||
4818 | /* Parse an assignment-expression. | |
4819 | ||
4820 | assignment-expression: | |
4821 | conditional-expression | |
4822 | logical-or-expression assignment-operator assignment_expression | |
4823 | throw-expression | |
4824 | ||
4825 | Returns a representation for the expression. */ | |
4826 | ||
4827 | static tree | |
94edc4ab | 4828 | cp_parser_assignment_expression (cp_parser* parser) |
a723baf1 MM |
4829 | { |
4830 | tree expr; | |
4831 | ||
4832 | /* If the next token is the `throw' keyword, then we're looking at | |
4833 | a throw-expression. */ | |
4834 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_THROW)) | |
4835 | expr = cp_parser_throw_expression (parser); | |
4836 | /* Otherwise, it must be that we are looking at a | |
4837 | logical-or-expression. */ | |
4838 | else | |
4839 | { | |
4840 | /* Parse the logical-or-expression. */ | |
4841 | expr = cp_parser_logical_or_expression (parser); | |
4842 | /* If the next token is a `?' then we're actually looking at a | |
4843 | conditional-expression. */ | |
4844 | if (cp_lexer_next_token_is (parser->lexer, CPP_QUERY)) | |
4845 | return cp_parser_question_colon_clause (parser, expr); | |
4846 | else | |
4847 | { | |
4848 | enum tree_code assignment_operator; | |
4849 | ||
4850 | /* If it's an assignment-operator, we're using the second | |
4851 | production. */ | |
4852 | assignment_operator | |
4853 | = cp_parser_assignment_operator_opt (parser); | |
4854 | if (assignment_operator != ERROR_MARK) | |
4855 | { | |
4856 | tree rhs; | |
4857 | ||
4858 | /* Parse the right-hand side of the assignment. */ | |
4859 | rhs = cp_parser_assignment_expression (parser); | |
14d22dd6 MM |
4860 | /* An assignment may not appear in a |
4861 | constant-expression. */ | |
4862 | if (parser->constant_expression_p) | |
4863 | { | |
4864 | if (!parser->allow_non_constant_expression_p) | |
4865 | return cp_parser_non_constant_expression ("an assignment"); | |
4866 | parser->non_constant_expression_p = true; | |
4867 | } | |
34cd5ae7 | 4868 | /* Build the assignment expression. */ |
a723baf1 MM |
4869 | expr = build_x_modify_expr (expr, |
4870 | assignment_operator, | |
4871 | rhs); | |
4872 | } | |
4873 | } | |
4874 | } | |
4875 | ||
4876 | return expr; | |
4877 | } | |
4878 | ||
4879 | /* Parse an (optional) assignment-operator. | |
4880 | ||
4881 | assignment-operator: one of | |
4882 | = *= /= %= += -= >>= <<= &= ^= |= | |
4883 | ||
4884 | GNU Extension: | |
4885 | ||
4886 | assignment-operator: one of | |
4887 | <?= >?= | |
4888 | ||
4889 | If the next token is an assignment operator, the corresponding tree | |
4890 | code is returned, and the token is consumed. For example, for | |
4891 | `+=', PLUS_EXPR is returned. For `=' itself, the code returned is | |
4892 | NOP_EXPR. For `/', TRUNC_DIV_EXPR is returned; for `%', | |
4893 | TRUNC_MOD_EXPR is returned. If TOKEN is not an assignment | |
4894 | operator, ERROR_MARK is returned. */ | |
4895 | ||
4896 | static enum tree_code | |
94edc4ab | 4897 | cp_parser_assignment_operator_opt (cp_parser* parser) |
a723baf1 MM |
4898 | { |
4899 | enum tree_code op; | |
4900 | cp_token *token; | |
4901 | ||
4902 | /* Peek at the next toen. */ | |
4903 | token = cp_lexer_peek_token (parser->lexer); | |
4904 | ||
4905 | switch (token->type) | |
4906 | { | |
4907 | case CPP_EQ: | |
4908 | op = NOP_EXPR; | |
4909 | break; | |
4910 | ||
4911 | case CPP_MULT_EQ: | |
4912 | op = MULT_EXPR; | |
4913 | break; | |
4914 | ||
4915 | case CPP_DIV_EQ: | |
4916 | op = TRUNC_DIV_EXPR; | |
4917 | break; | |
4918 | ||
4919 | case CPP_MOD_EQ: | |
4920 | op = TRUNC_MOD_EXPR; | |
4921 | break; | |
4922 | ||
4923 | case CPP_PLUS_EQ: | |
4924 | op = PLUS_EXPR; | |
4925 | break; | |
4926 | ||
4927 | case CPP_MINUS_EQ: | |
4928 | op = MINUS_EXPR; | |
4929 | break; | |
4930 | ||
4931 | case CPP_RSHIFT_EQ: | |
4932 | op = RSHIFT_EXPR; | |
4933 | break; | |
4934 | ||
4935 | case CPP_LSHIFT_EQ: | |
4936 | op = LSHIFT_EXPR; | |
4937 | break; | |
4938 | ||
4939 | case CPP_AND_EQ: | |
4940 | op = BIT_AND_EXPR; | |
4941 | break; | |
4942 | ||
4943 | case CPP_XOR_EQ: | |
4944 | op = BIT_XOR_EXPR; | |
4945 | break; | |
4946 | ||
4947 | case CPP_OR_EQ: | |
4948 | op = BIT_IOR_EXPR; | |
4949 | break; | |
4950 | ||
4951 | case CPP_MIN_EQ: | |
4952 | op = MIN_EXPR; | |
4953 | break; | |
4954 | ||
4955 | case CPP_MAX_EQ: | |
4956 | op = MAX_EXPR; | |
4957 | break; | |
4958 | ||
4959 | default: | |
4960 | /* Nothing else is an assignment operator. */ | |
4961 | op = ERROR_MARK; | |
4962 | } | |
4963 | ||
4964 | /* If it was an assignment operator, consume it. */ | |
4965 | if (op != ERROR_MARK) | |
4966 | cp_lexer_consume_token (parser->lexer); | |
4967 | ||
4968 | return op; | |
4969 | } | |
4970 | ||
4971 | /* Parse an expression. | |
4972 | ||
4973 | expression: | |
4974 | assignment-expression | |
4975 | expression , assignment-expression | |
4976 | ||
4977 | Returns a representation of the expression. */ | |
4978 | ||
4979 | static tree | |
94edc4ab | 4980 | cp_parser_expression (cp_parser* parser) |
a723baf1 MM |
4981 | { |
4982 | tree expression = NULL_TREE; | |
a723baf1 MM |
4983 | |
4984 | while (true) | |
4985 | { | |
4986 | tree assignment_expression; | |
4987 | ||
4988 | /* Parse the next assignment-expression. */ | |
4989 | assignment_expression | |
4990 | = cp_parser_assignment_expression (parser); | |
4991 | /* If this is the first assignment-expression, we can just | |
4992 | save it away. */ | |
4993 | if (!expression) | |
4994 | expression = assignment_expression; | |
a723baf1 | 4995 | else |
d17811fd MM |
4996 | expression = build_x_compound_expr (expression, |
4997 | assignment_expression); | |
a723baf1 MM |
4998 | /* If the next token is not a comma, then we are done with the |
4999 | expression. */ | |
5000 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
5001 | break; | |
5002 | /* Consume the `,'. */ | |
5003 | cp_lexer_consume_token (parser->lexer); | |
14d22dd6 MM |
5004 | /* A comma operator cannot appear in a constant-expression. */ |
5005 | if (parser->constant_expression_p) | |
5006 | { | |
5007 | if (!parser->allow_non_constant_expression_p) | |
d17811fd MM |
5008 | expression |
5009 | = cp_parser_non_constant_expression ("a comma operator"); | |
14d22dd6 MM |
5010 | parser->non_constant_expression_p = true; |
5011 | } | |
14d22dd6 | 5012 | } |
a723baf1 MM |
5013 | |
5014 | return expression; | |
5015 | } | |
5016 | ||
5017 | /* Parse a constant-expression. | |
5018 | ||
5019 | constant-expression: | |
14d22dd6 MM |
5020 | conditional-expression |
5021 | ||
5022 | If ALLOW_NON_CONSTANT_P a non-constant expression is silently | |
d17811fd MM |
5023 | accepted. If ALLOW_NON_CONSTANT_P is true and the expression is not |
5024 | constant, *NON_CONSTANT_P is set to TRUE. If ALLOW_NON_CONSTANT_P | |
5025 | is false, NON_CONSTANT_P should be NULL. */ | |
a723baf1 MM |
5026 | |
5027 | static tree | |
14d22dd6 MM |
5028 | cp_parser_constant_expression (cp_parser* parser, |
5029 | bool allow_non_constant_p, | |
5030 | bool *non_constant_p) | |
a723baf1 MM |
5031 | { |
5032 | bool saved_constant_expression_p; | |
14d22dd6 MM |
5033 | bool saved_allow_non_constant_expression_p; |
5034 | bool saved_non_constant_expression_p; | |
a723baf1 MM |
5035 | tree expression; |
5036 | ||
5037 | /* It might seem that we could simply parse the | |
5038 | conditional-expression, and then check to see if it were | |
5039 | TREE_CONSTANT. However, an expression that is TREE_CONSTANT is | |
5040 | one that the compiler can figure out is constant, possibly after | |
5041 | doing some simplifications or optimizations. The standard has a | |
5042 | precise definition of constant-expression, and we must honor | |
5043 | that, even though it is somewhat more restrictive. | |
5044 | ||
5045 | For example: | |
5046 | ||
5047 | int i[(2, 3)]; | |
5048 | ||
5049 | is not a legal declaration, because `(2, 3)' is not a | |
5050 | constant-expression. The `,' operator is forbidden in a | |
5051 | constant-expression. However, GCC's constant-folding machinery | |
5052 | will fold this operation to an INTEGER_CST for `3'. */ | |
5053 | ||
14d22dd6 | 5054 | /* Save the old settings. */ |
a723baf1 | 5055 | saved_constant_expression_p = parser->constant_expression_p; |
14d22dd6 MM |
5056 | saved_allow_non_constant_expression_p |
5057 | = parser->allow_non_constant_expression_p; | |
5058 | saved_non_constant_expression_p = parser->non_constant_expression_p; | |
a723baf1 MM |
5059 | /* We are now parsing a constant-expression. */ |
5060 | parser->constant_expression_p = true; | |
14d22dd6 MM |
5061 | parser->allow_non_constant_expression_p = allow_non_constant_p; |
5062 | parser->non_constant_expression_p = false; | |
39703eb9 MM |
5063 | /* Although the grammar says "conditional-expression", we parse an |
5064 | "assignment-expression", which also permits "throw-expression" | |
5065 | and the use of assignment operators. In the case that | |
5066 | ALLOW_NON_CONSTANT_P is false, we get better errors than we would | |
5067 | otherwise. In the case that ALLOW_NON_CONSTANT_P is true, it is | |
5068 | actually essential that we look for an assignment-expression. | |
5069 | For example, cp_parser_initializer_clauses uses this function to | |
5070 | determine whether a particular assignment-expression is in fact | |
5071 | constant. */ | |
5072 | expression = cp_parser_assignment_expression (parser); | |
14d22dd6 | 5073 | /* Restore the old settings. */ |
a723baf1 | 5074 | parser->constant_expression_p = saved_constant_expression_p; |
14d22dd6 MM |
5075 | parser->allow_non_constant_expression_p |
5076 | = saved_allow_non_constant_expression_p; | |
5077 | if (allow_non_constant_p) | |
5078 | *non_constant_p = parser->non_constant_expression_p; | |
5079 | parser->non_constant_expression_p = saved_non_constant_expression_p; | |
a723baf1 MM |
5080 | |
5081 | return expression; | |
5082 | } | |
5083 | ||
5084 | /* Statements [gram.stmt.stmt] */ | |
5085 | ||
5086 | /* Parse a statement. | |
5087 | ||
5088 | statement: | |
5089 | labeled-statement | |
5090 | expression-statement | |
5091 | compound-statement | |
5092 | selection-statement | |
5093 | iteration-statement | |
5094 | jump-statement | |
5095 | declaration-statement | |
5096 | try-block */ | |
5097 | ||
5098 | static void | |
94edc4ab | 5099 | cp_parser_statement (cp_parser* parser) |
a723baf1 MM |
5100 | { |
5101 | tree statement; | |
5102 | cp_token *token; | |
5103 | int statement_line_number; | |
5104 | ||
5105 | /* There is no statement yet. */ | |
5106 | statement = NULL_TREE; | |
5107 | /* Peek at the next token. */ | |
5108 | token = cp_lexer_peek_token (parser->lexer); | |
5109 | /* Remember the line number of the first token in the statement. */ | |
82a98427 | 5110 | statement_line_number = token->location.line; |
a723baf1 MM |
5111 | /* If this is a keyword, then that will often determine what kind of |
5112 | statement we have. */ | |
5113 | if (token->type == CPP_KEYWORD) | |
5114 | { | |
5115 | enum rid keyword = token->keyword; | |
5116 | ||
5117 | switch (keyword) | |
5118 | { | |
5119 | case RID_CASE: | |
5120 | case RID_DEFAULT: | |
5121 | statement = cp_parser_labeled_statement (parser); | |
5122 | break; | |
5123 | ||
5124 | case RID_IF: | |
5125 | case RID_SWITCH: | |
5126 | statement = cp_parser_selection_statement (parser); | |
5127 | break; | |
5128 | ||
5129 | case RID_WHILE: | |
5130 | case RID_DO: | |
5131 | case RID_FOR: | |
5132 | statement = cp_parser_iteration_statement (parser); | |
5133 | break; | |
5134 | ||
5135 | case RID_BREAK: | |
5136 | case RID_CONTINUE: | |
5137 | case RID_RETURN: | |
5138 | case RID_GOTO: | |
5139 | statement = cp_parser_jump_statement (parser); | |
5140 | break; | |
5141 | ||
5142 | case RID_TRY: | |
5143 | statement = cp_parser_try_block (parser); | |
5144 | break; | |
5145 | ||
5146 | default: | |
5147 | /* It might be a keyword like `int' that can start a | |
5148 | declaration-statement. */ | |
5149 | break; | |
5150 | } | |
5151 | } | |
5152 | else if (token->type == CPP_NAME) | |
5153 | { | |
5154 | /* If the next token is a `:', then we are looking at a | |
5155 | labeled-statement. */ | |
5156 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
5157 | if (token->type == CPP_COLON) | |
5158 | statement = cp_parser_labeled_statement (parser); | |
5159 | } | |
5160 | /* Anything that starts with a `{' must be a compound-statement. */ | |
5161 | else if (token->type == CPP_OPEN_BRACE) | |
5162 | statement = cp_parser_compound_statement (parser); | |
5163 | ||
5164 | /* Everything else must be a declaration-statement or an | |
5165 | expression-statement. Try for the declaration-statement | |
5166 | first, unless we are looking at a `;', in which case we know that | |
5167 | we have an expression-statement. */ | |
5168 | if (!statement) | |
5169 | { | |
5170 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
5171 | { | |
5172 | cp_parser_parse_tentatively (parser); | |
5173 | /* Try to parse the declaration-statement. */ | |
5174 | cp_parser_declaration_statement (parser); | |
5175 | /* If that worked, we're done. */ | |
5176 | if (cp_parser_parse_definitely (parser)) | |
5177 | return; | |
5178 | } | |
5179 | /* Look for an expression-statement instead. */ | |
5180 | statement = cp_parser_expression_statement (parser); | |
5181 | } | |
5182 | ||
5183 | /* Set the line number for the statement. */ | |
009ed910 | 5184 | if (statement && STATEMENT_CODE_P (TREE_CODE (statement))) |
a723baf1 MM |
5185 | STMT_LINENO (statement) = statement_line_number; |
5186 | } | |
5187 | ||
5188 | /* Parse a labeled-statement. | |
5189 | ||
5190 | labeled-statement: | |
5191 | identifier : statement | |
5192 | case constant-expression : statement | |
5193 | default : statement | |
5194 | ||
5195 | Returns the new CASE_LABEL, for a `case' or `default' label. For | |
5196 | an ordinary label, returns a LABEL_STMT. */ | |
5197 | ||
5198 | static tree | |
94edc4ab | 5199 | cp_parser_labeled_statement (cp_parser* parser) |
a723baf1 MM |
5200 | { |
5201 | cp_token *token; | |
5202 | tree statement = NULL_TREE; | |
5203 | ||
5204 | /* The next token should be an identifier. */ | |
5205 | token = cp_lexer_peek_token (parser->lexer); | |
5206 | if (token->type != CPP_NAME | |
5207 | && token->type != CPP_KEYWORD) | |
5208 | { | |
5209 | cp_parser_error (parser, "expected labeled-statement"); | |
5210 | return error_mark_node; | |
5211 | } | |
5212 | ||
5213 | switch (token->keyword) | |
5214 | { | |
5215 | case RID_CASE: | |
5216 | { | |
5217 | tree expr; | |
5218 | ||
5219 | /* Consume the `case' token. */ | |
5220 | cp_lexer_consume_token (parser->lexer); | |
5221 | /* Parse the constant-expression. */ | |
14d22dd6 | 5222 | expr = cp_parser_constant_expression (parser, |
d17811fd | 5223 | /*allow_non_constant_p=*/false, |
14d22dd6 | 5224 | NULL); |
a723baf1 MM |
5225 | /* Create the label. */ |
5226 | statement = finish_case_label (expr, NULL_TREE); | |
5227 | } | |
5228 | break; | |
5229 | ||
5230 | case RID_DEFAULT: | |
5231 | /* Consume the `default' token. */ | |
5232 | cp_lexer_consume_token (parser->lexer); | |
5233 | /* Create the label. */ | |
5234 | statement = finish_case_label (NULL_TREE, NULL_TREE); | |
5235 | break; | |
5236 | ||
5237 | default: | |
5238 | /* Anything else must be an ordinary label. */ | |
5239 | statement = finish_label_stmt (cp_parser_identifier (parser)); | |
5240 | break; | |
5241 | } | |
5242 | ||
5243 | /* Require the `:' token. */ | |
5244 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
5245 | /* Parse the labeled statement. */ | |
5246 | cp_parser_statement (parser); | |
5247 | ||
5248 | /* Return the label, in the case of a `case' or `default' label. */ | |
5249 | return statement; | |
5250 | } | |
5251 | ||
5252 | /* Parse an expression-statement. | |
5253 | ||
5254 | expression-statement: | |
5255 | expression [opt] ; | |
5256 | ||
5257 | Returns the new EXPR_STMT -- or NULL_TREE if the expression | |
5258 | statement consists of nothing more than an `;'. */ | |
5259 | ||
5260 | static tree | |
94edc4ab | 5261 | cp_parser_expression_statement (cp_parser* parser) |
a723baf1 MM |
5262 | { |
5263 | tree statement; | |
5264 | ||
5265 | /* If the next token is not a `;', then there is an expression to parse. */ | |
5266 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
5267 | statement = finish_expr_stmt (cp_parser_expression (parser)); | |
5268 | /* Otherwise, we do not even bother to build an EXPR_STMT. */ | |
5269 | else | |
5270 | { | |
5271 | finish_stmt (); | |
5272 | statement = NULL_TREE; | |
5273 | } | |
5274 | /* Consume the final `;'. */ | |
e0860732 | 5275 | cp_parser_consume_semicolon_at_end_of_statement (parser); |
a723baf1 MM |
5276 | |
5277 | return statement; | |
5278 | } | |
5279 | ||
5280 | /* Parse a compound-statement. | |
5281 | ||
5282 | compound-statement: | |
5283 | { statement-seq [opt] } | |
5284 | ||
5285 | Returns a COMPOUND_STMT representing the statement. */ | |
5286 | ||
5287 | static tree | |
5288 | cp_parser_compound_statement (cp_parser *parser) | |
5289 | { | |
5290 | tree compound_stmt; | |
5291 | ||
5292 | /* Consume the `{'. */ | |
5293 | if (!cp_parser_require (parser, CPP_OPEN_BRACE, "`{'")) | |
5294 | return error_mark_node; | |
5295 | /* Begin the compound-statement. */ | |
5296 | compound_stmt = begin_compound_stmt (/*has_no_scope=*/0); | |
5297 | /* Parse an (optional) statement-seq. */ | |
5298 | cp_parser_statement_seq_opt (parser); | |
5299 | /* Finish the compound-statement. */ | |
5300 | finish_compound_stmt (/*has_no_scope=*/0, compound_stmt); | |
5301 | /* Consume the `}'. */ | |
5302 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
5303 | ||
5304 | return compound_stmt; | |
5305 | } | |
5306 | ||
5307 | /* Parse an (optional) statement-seq. | |
5308 | ||
5309 | statement-seq: | |
5310 | statement | |
5311 | statement-seq [opt] statement */ | |
5312 | ||
5313 | static void | |
94edc4ab | 5314 | cp_parser_statement_seq_opt (cp_parser* parser) |
a723baf1 MM |
5315 | { |
5316 | /* Scan statements until there aren't any more. */ | |
5317 | while (true) | |
5318 | { | |
5319 | /* If we're looking at a `}', then we've run out of statements. */ | |
5320 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_BRACE) | |
5321 | || cp_lexer_next_token_is (parser->lexer, CPP_EOF)) | |
5322 | break; | |
5323 | ||
5324 | /* Parse the statement. */ | |
5325 | cp_parser_statement (parser); | |
5326 | } | |
5327 | } | |
5328 | ||
5329 | /* Parse a selection-statement. | |
5330 | ||
5331 | selection-statement: | |
5332 | if ( condition ) statement | |
5333 | if ( condition ) statement else statement | |
5334 | switch ( condition ) statement | |
5335 | ||
5336 | Returns the new IF_STMT or SWITCH_STMT. */ | |
5337 | ||
5338 | static tree | |
94edc4ab | 5339 | cp_parser_selection_statement (cp_parser* parser) |
a723baf1 MM |
5340 | { |
5341 | cp_token *token; | |
5342 | enum rid keyword; | |
5343 | ||
5344 | /* Peek at the next token. */ | |
5345 | token = cp_parser_require (parser, CPP_KEYWORD, "selection-statement"); | |
5346 | ||
5347 | /* See what kind of keyword it is. */ | |
5348 | keyword = token->keyword; | |
5349 | switch (keyword) | |
5350 | { | |
5351 | case RID_IF: | |
5352 | case RID_SWITCH: | |
5353 | { | |
5354 | tree statement; | |
5355 | tree condition; | |
5356 | ||
5357 | /* Look for the `('. */ | |
5358 | if (!cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) | |
5359 | { | |
5360 | cp_parser_skip_to_end_of_statement (parser); | |
5361 | return error_mark_node; | |
5362 | } | |
5363 | ||
5364 | /* Begin the selection-statement. */ | |
5365 | if (keyword == RID_IF) | |
5366 | statement = begin_if_stmt (); | |
5367 | else | |
5368 | statement = begin_switch_stmt (); | |
5369 | ||
5370 | /* Parse the condition. */ | |
5371 | condition = cp_parser_condition (parser); | |
5372 | /* Look for the `)'. */ | |
5373 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
7efa3e22 | 5374 | cp_parser_skip_to_closing_parenthesis (parser, true, false); |
a723baf1 MM |
5375 | |
5376 | if (keyword == RID_IF) | |
5377 | { | |
5378 | tree then_stmt; | |
5379 | ||
5380 | /* Add the condition. */ | |
5381 | finish_if_stmt_cond (condition, statement); | |
5382 | ||
5383 | /* Parse the then-clause. */ | |
5384 | then_stmt = cp_parser_implicitly_scoped_statement (parser); | |
5385 | finish_then_clause (statement); | |
5386 | ||
5387 | /* If the next token is `else', parse the else-clause. */ | |
5388 | if (cp_lexer_next_token_is_keyword (parser->lexer, | |
5389 | RID_ELSE)) | |
5390 | { | |
5391 | tree else_stmt; | |
5392 | ||
5393 | /* Consume the `else' keyword. */ | |
5394 | cp_lexer_consume_token (parser->lexer); | |
5395 | /* Parse the else-clause. */ | |
5396 | else_stmt | |
5397 | = cp_parser_implicitly_scoped_statement (parser); | |
5398 | finish_else_clause (statement); | |
5399 | } | |
5400 | ||
5401 | /* Now we're all done with the if-statement. */ | |
5402 | finish_if_stmt (); | |
5403 | } | |
5404 | else | |
5405 | { | |
5406 | tree body; | |
5407 | ||
5408 | /* Add the condition. */ | |
5409 | finish_switch_cond (condition, statement); | |
5410 | ||
5411 | /* Parse the body of the switch-statement. */ | |
5412 | body = cp_parser_implicitly_scoped_statement (parser); | |
5413 | ||
5414 | /* Now we're all done with the switch-statement. */ | |
5415 | finish_switch_stmt (statement); | |
5416 | } | |
5417 | ||
5418 | return statement; | |
5419 | } | |
5420 | break; | |
5421 | ||
5422 | default: | |
5423 | cp_parser_error (parser, "expected selection-statement"); | |
5424 | return error_mark_node; | |
5425 | } | |
5426 | } | |
5427 | ||
5428 | /* Parse a condition. | |
5429 | ||
5430 | condition: | |
5431 | expression | |
5432 | type-specifier-seq declarator = assignment-expression | |
5433 | ||
5434 | GNU Extension: | |
5435 | ||
5436 | condition: | |
5437 | type-specifier-seq declarator asm-specification [opt] | |
5438 | attributes [opt] = assignment-expression | |
5439 | ||
5440 | Returns the expression that should be tested. */ | |
5441 | ||
5442 | static tree | |
94edc4ab | 5443 | cp_parser_condition (cp_parser* parser) |
a723baf1 MM |
5444 | { |
5445 | tree type_specifiers; | |
5446 | const char *saved_message; | |
5447 | ||
5448 | /* Try the declaration first. */ | |
5449 | cp_parser_parse_tentatively (parser); | |
5450 | /* New types are not allowed in the type-specifier-seq for a | |
5451 | condition. */ | |
5452 | saved_message = parser->type_definition_forbidden_message; | |
5453 | parser->type_definition_forbidden_message | |
5454 | = "types may not be defined in conditions"; | |
5455 | /* Parse the type-specifier-seq. */ | |
5456 | type_specifiers = cp_parser_type_specifier_seq (parser); | |
5457 | /* Restore the saved message. */ | |
5458 | parser->type_definition_forbidden_message = saved_message; | |
5459 | /* If all is well, we might be looking at a declaration. */ | |
5460 | if (!cp_parser_error_occurred (parser)) | |
5461 | { | |
5462 | tree decl; | |
5463 | tree asm_specification; | |
5464 | tree attributes; | |
5465 | tree declarator; | |
5466 | tree initializer = NULL_TREE; | |
5467 | ||
5468 | /* Parse the declarator. */ | |
62b8a44e | 5469 | declarator = cp_parser_declarator (parser, CP_PARSER_DECLARATOR_NAMED, |
a723baf1 MM |
5470 | /*ctor_dtor_or_conv_p=*/NULL); |
5471 | /* Parse the attributes. */ | |
5472 | attributes = cp_parser_attributes_opt (parser); | |
5473 | /* Parse the asm-specification. */ | |
5474 | asm_specification = cp_parser_asm_specification_opt (parser); | |
5475 | /* If the next token is not an `=', then we might still be | |
5476 | looking at an expression. For example: | |
5477 | ||
5478 | if (A(a).x) | |
5479 | ||
5480 | looks like a decl-specifier-seq and a declarator -- but then | |
5481 | there is no `=', so this is an expression. */ | |
5482 | cp_parser_require (parser, CPP_EQ, "`='"); | |
5483 | /* If we did see an `=', then we are looking at a declaration | |
5484 | for sure. */ | |
5485 | if (cp_parser_parse_definitely (parser)) | |
5486 | { | |
5487 | /* Create the declaration. */ | |
5488 | decl = start_decl (declarator, type_specifiers, | |
5489 | /*initialized_p=*/true, | |
5490 | attributes, /*prefix_attributes=*/NULL_TREE); | |
5491 | /* Parse the assignment-expression. */ | |
5492 | initializer = cp_parser_assignment_expression (parser); | |
5493 | ||
5494 | /* Process the initializer. */ | |
5495 | cp_finish_decl (decl, | |
5496 | initializer, | |
5497 | asm_specification, | |
5498 | LOOKUP_ONLYCONVERTING); | |
5499 | ||
5500 | return convert_from_reference (decl); | |
5501 | } | |
5502 | } | |
5503 | /* If we didn't even get past the declarator successfully, we are | |
5504 | definitely not looking at a declaration. */ | |
5505 | else | |
5506 | cp_parser_abort_tentative_parse (parser); | |
5507 | ||
5508 | /* Otherwise, we are looking at an expression. */ | |
5509 | return cp_parser_expression (parser); | |
5510 | } | |
5511 | ||
5512 | /* Parse an iteration-statement. | |
5513 | ||
5514 | iteration-statement: | |
5515 | while ( condition ) statement | |
5516 | do statement while ( expression ) ; | |
5517 | for ( for-init-statement condition [opt] ; expression [opt] ) | |
5518 | statement | |
5519 | ||
5520 | Returns the new WHILE_STMT, DO_STMT, or FOR_STMT. */ | |
5521 | ||
5522 | static tree | |
94edc4ab | 5523 | cp_parser_iteration_statement (cp_parser* parser) |
a723baf1 MM |
5524 | { |
5525 | cp_token *token; | |
5526 | enum rid keyword; | |
5527 | tree statement; | |
5528 | ||
5529 | /* Peek at the next token. */ | |
5530 | token = cp_parser_require (parser, CPP_KEYWORD, "iteration-statement"); | |
5531 | if (!token) | |
5532 | return error_mark_node; | |
5533 | ||
5534 | /* See what kind of keyword it is. */ | |
5535 | keyword = token->keyword; | |
5536 | switch (keyword) | |
5537 | { | |
5538 | case RID_WHILE: | |
5539 | { | |
5540 | tree condition; | |
5541 | ||
5542 | /* Begin the while-statement. */ | |
5543 | statement = begin_while_stmt (); | |
5544 | /* Look for the `('. */ | |
5545 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
5546 | /* Parse the condition. */ | |
5547 | condition = cp_parser_condition (parser); | |
5548 | finish_while_stmt_cond (condition, statement); | |
5549 | /* Look for the `)'. */ | |
5550 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
5551 | /* Parse the dependent statement. */ | |
5552 | cp_parser_already_scoped_statement (parser); | |
5553 | /* We're done with the while-statement. */ | |
5554 | finish_while_stmt (statement); | |
5555 | } | |
5556 | break; | |
5557 | ||
5558 | case RID_DO: | |
5559 | { | |
5560 | tree expression; | |
5561 | ||
5562 | /* Begin the do-statement. */ | |
5563 | statement = begin_do_stmt (); | |
5564 | /* Parse the body of the do-statement. */ | |
5565 | cp_parser_implicitly_scoped_statement (parser); | |
5566 | finish_do_body (statement); | |
5567 | /* Look for the `while' keyword. */ | |
5568 | cp_parser_require_keyword (parser, RID_WHILE, "`while'"); | |
5569 | /* Look for the `('. */ | |
5570 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
5571 | /* Parse the expression. */ | |
5572 | expression = cp_parser_expression (parser); | |
5573 | /* We're done with the do-statement. */ | |
5574 | finish_do_stmt (expression, statement); | |
5575 | /* Look for the `)'. */ | |
5576 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
5577 | /* Look for the `;'. */ | |
5578 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
5579 | } | |
5580 | break; | |
5581 | ||
5582 | case RID_FOR: | |
5583 | { | |
5584 | tree condition = NULL_TREE; | |
5585 | tree expression = NULL_TREE; | |
5586 | ||
5587 | /* Begin the for-statement. */ | |
5588 | statement = begin_for_stmt (); | |
5589 | /* Look for the `('. */ | |
5590 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
5591 | /* Parse the initialization. */ | |
5592 | cp_parser_for_init_statement (parser); | |
5593 | finish_for_init_stmt (statement); | |
5594 | ||
5595 | /* If there's a condition, process it. */ | |
5596 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
5597 | condition = cp_parser_condition (parser); | |
5598 | finish_for_cond (condition, statement); | |
5599 | /* Look for the `;'. */ | |
5600 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
5601 | ||
5602 | /* If there's an expression, process it. */ | |
5603 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_PAREN)) | |
5604 | expression = cp_parser_expression (parser); | |
5605 | finish_for_expr (expression, statement); | |
5606 | /* Look for the `)'. */ | |
5607 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`;'"); | |
5608 | ||
5609 | /* Parse the body of the for-statement. */ | |
5610 | cp_parser_already_scoped_statement (parser); | |
5611 | ||
5612 | /* We're done with the for-statement. */ | |
5613 | finish_for_stmt (statement); | |
5614 | } | |
5615 | break; | |
5616 | ||
5617 | default: | |
5618 | cp_parser_error (parser, "expected iteration-statement"); | |
5619 | statement = error_mark_node; | |
5620 | break; | |
5621 | } | |
5622 | ||
5623 | return statement; | |
5624 | } | |
5625 | ||
5626 | /* Parse a for-init-statement. | |
5627 | ||
5628 | for-init-statement: | |
5629 | expression-statement | |
5630 | simple-declaration */ | |
5631 | ||
5632 | static void | |
94edc4ab | 5633 | cp_parser_for_init_statement (cp_parser* parser) |
a723baf1 MM |
5634 | { |
5635 | /* If the next token is a `;', then we have an empty | |
34cd5ae7 | 5636 | expression-statement. Grammatically, this is also a |
a723baf1 MM |
5637 | simple-declaration, but an invalid one, because it does not |
5638 | declare anything. Therefore, if we did not handle this case | |
5639 | specially, we would issue an error message about an invalid | |
5640 | declaration. */ | |
5641 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
5642 | { | |
5643 | /* We're going to speculatively look for a declaration, falling back | |
5644 | to an expression, if necessary. */ | |
5645 | cp_parser_parse_tentatively (parser); | |
5646 | /* Parse the declaration. */ | |
5647 | cp_parser_simple_declaration (parser, | |
5648 | /*function_definition_allowed_p=*/false); | |
5649 | /* If the tentative parse failed, then we shall need to look for an | |
5650 | expression-statement. */ | |
5651 | if (cp_parser_parse_definitely (parser)) | |
5652 | return; | |
5653 | } | |
5654 | ||
5655 | cp_parser_expression_statement (parser); | |
5656 | } | |
5657 | ||
5658 | /* Parse a jump-statement. | |
5659 | ||
5660 | jump-statement: | |
5661 | break ; | |
5662 | continue ; | |
5663 | return expression [opt] ; | |
5664 | goto identifier ; | |
5665 | ||
5666 | GNU extension: | |
5667 | ||
5668 | jump-statement: | |
5669 | goto * expression ; | |
5670 | ||
5671 | Returns the new BREAK_STMT, CONTINUE_STMT, RETURN_STMT, or | |
5672 | GOTO_STMT. */ | |
5673 | ||
5674 | static tree | |
94edc4ab | 5675 | cp_parser_jump_statement (cp_parser* parser) |
a723baf1 MM |
5676 | { |
5677 | tree statement = error_mark_node; | |
5678 | cp_token *token; | |
5679 | enum rid keyword; | |
5680 | ||
5681 | /* Peek at the next token. */ | |
5682 | token = cp_parser_require (parser, CPP_KEYWORD, "jump-statement"); | |
5683 | if (!token) | |
5684 | return error_mark_node; | |
5685 | ||
5686 | /* See what kind of keyword it is. */ | |
5687 | keyword = token->keyword; | |
5688 | switch (keyword) | |
5689 | { | |
5690 | case RID_BREAK: | |
5691 | statement = finish_break_stmt (); | |
5692 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
5693 | break; | |
5694 | ||
5695 | case RID_CONTINUE: | |
5696 | statement = finish_continue_stmt (); | |
5697 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
5698 | break; | |
5699 | ||
5700 | case RID_RETURN: | |
5701 | { | |
5702 | tree expr; | |
5703 | ||
5704 | /* If the next token is a `;', then there is no | |
5705 | expression. */ | |
5706 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
5707 | expr = cp_parser_expression (parser); | |
5708 | else | |
5709 | expr = NULL_TREE; | |
5710 | /* Build the return-statement. */ | |
5711 | statement = finish_return_stmt (expr); | |
5712 | /* Look for the final `;'. */ | |
5713 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
5714 | } | |
5715 | break; | |
5716 | ||
5717 | case RID_GOTO: | |
5718 | /* Create the goto-statement. */ | |
5719 | if (cp_lexer_next_token_is (parser->lexer, CPP_MULT)) | |
5720 | { | |
5721 | /* Issue a warning about this use of a GNU extension. */ | |
5722 | if (pedantic) | |
5723 | pedwarn ("ISO C++ forbids computed gotos"); | |
5724 | /* Consume the '*' token. */ | |
5725 | cp_lexer_consume_token (parser->lexer); | |
5726 | /* Parse the dependent expression. */ | |
5727 | finish_goto_stmt (cp_parser_expression (parser)); | |
5728 | } | |
5729 | else | |
5730 | finish_goto_stmt (cp_parser_identifier (parser)); | |
5731 | /* Look for the final `;'. */ | |
5732 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
5733 | break; | |
5734 | ||
5735 | default: | |
5736 | cp_parser_error (parser, "expected jump-statement"); | |
5737 | break; | |
5738 | } | |
5739 | ||
5740 | return statement; | |
5741 | } | |
5742 | ||
5743 | /* Parse a declaration-statement. | |
5744 | ||
5745 | declaration-statement: | |
5746 | block-declaration */ | |
5747 | ||
5748 | static void | |
94edc4ab | 5749 | cp_parser_declaration_statement (cp_parser* parser) |
a723baf1 MM |
5750 | { |
5751 | /* Parse the block-declaration. */ | |
5752 | cp_parser_block_declaration (parser, /*statement_p=*/true); | |
5753 | ||
5754 | /* Finish off the statement. */ | |
5755 | finish_stmt (); | |
5756 | } | |
5757 | ||
5758 | /* Some dependent statements (like `if (cond) statement'), are | |
5759 | implicitly in their own scope. In other words, if the statement is | |
5760 | a single statement (as opposed to a compound-statement), it is | |
5761 | none-the-less treated as if it were enclosed in braces. Any | |
5762 | declarations appearing in the dependent statement are out of scope | |
5763 | after control passes that point. This function parses a statement, | |
5764 | but ensures that is in its own scope, even if it is not a | |
5765 | compound-statement. | |
5766 | ||
5767 | Returns the new statement. */ | |
5768 | ||
5769 | static tree | |
94edc4ab | 5770 | cp_parser_implicitly_scoped_statement (cp_parser* parser) |
a723baf1 MM |
5771 | { |
5772 | tree statement; | |
5773 | ||
5774 | /* If the token is not a `{', then we must take special action. */ | |
5775 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_BRACE)) | |
5776 | { | |
5777 | /* Create a compound-statement. */ | |
5778 | statement = begin_compound_stmt (/*has_no_scope=*/0); | |
5779 | /* Parse the dependent-statement. */ | |
5780 | cp_parser_statement (parser); | |
5781 | /* Finish the dummy compound-statement. */ | |
5782 | finish_compound_stmt (/*has_no_scope=*/0, statement); | |
5783 | } | |
5784 | /* Otherwise, we simply parse the statement directly. */ | |
5785 | else | |
5786 | statement = cp_parser_compound_statement (parser); | |
5787 | ||
5788 | /* Return the statement. */ | |
5789 | return statement; | |
5790 | } | |
5791 | ||
5792 | /* For some dependent statements (like `while (cond) statement'), we | |
5793 | have already created a scope. Therefore, even if the dependent | |
5794 | statement is a compound-statement, we do not want to create another | |
5795 | scope. */ | |
5796 | ||
5797 | static void | |
94edc4ab | 5798 | cp_parser_already_scoped_statement (cp_parser* parser) |
a723baf1 MM |
5799 | { |
5800 | /* If the token is not a `{', then we must take special action. */ | |
5801 | if (cp_lexer_next_token_is_not(parser->lexer, CPP_OPEN_BRACE)) | |
5802 | { | |
5803 | tree statement; | |
5804 | ||
5805 | /* Create a compound-statement. */ | |
5806 | statement = begin_compound_stmt (/*has_no_scope=*/1); | |
5807 | /* Parse the dependent-statement. */ | |
5808 | cp_parser_statement (parser); | |
5809 | /* Finish the dummy compound-statement. */ | |
5810 | finish_compound_stmt (/*has_no_scope=*/1, statement); | |
5811 | } | |
5812 | /* Otherwise, we simply parse the statement directly. */ | |
5813 | else | |
5814 | cp_parser_statement (parser); | |
5815 | } | |
5816 | ||
5817 | /* Declarations [gram.dcl.dcl] */ | |
5818 | ||
5819 | /* Parse an optional declaration-sequence. | |
5820 | ||
5821 | declaration-seq: | |
5822 | declaration | |
5823 | declaration-seq declaration */ | |
5824 | ||
5825 | static void | |
94edc4ab | 5826 | cp_parser_declaration_seq_opt (cp_parser* parser) |
a723baf1 MM |
5827 | { |
5828 | while (true) | |
5829 | { | |
5830 | cp_token *token; | |
5831 | ||
5832 | token = cp_lexer_peek_token (parser->lexer); | |
5833 | ||
5834 | if (token->type == CPP_CLOSE_BRACE | |
5835 | || token->type == CPP_EOF) | |
5836 | break; | |
5837 | ||
5838 | if (token->type == CPP_SEMICOLON) | |
5839 | { | |
5840 | /* A declaration consisting of a single semicolon is | |
5841 | invalid. Allow it unless we're being pedantic. */ | |
5842 | if (pedantic) | |
5843 | pedwarn ("extra `;'"); | |
5844 | cp_lexer_consume_token (parser->lexer); | |
5845 | continue; | |
5846 | } | |
5847 | ||
c838d82f | 5848 | /* The C lexer modifies PENDING_LANG_CHANGE when it wants the |
34cd5ae7 | 5849 | parser to enter or exit implicit `extern "C"' blocks. */ |
c838d82f MM |
5850 | while (pending_lang_change > 0) |
5851 | { | |
5852 | push_lang_context (lang_name_c); | |
5853 | --pending_lang_change; | |
5854 | } | |
5855 | while (pending_lang_change < 0) | |
5856 | { | |
5857 | pop_lang_context (); | |
5858 | ++pending_lang_change; | |
5859 | } | |
5860 | ||
5861 | /* Parse the declaration itself. */ | |
a723baf1 MM |
5862 | cp_parser_declaration (parser); |
5863 | } | |
5864 | } | |
5865 | ||
5866 | /* Parse a declaration. | |
5867 | ||
5868 | declaration: | |
5869 | block-declaration | |
5870 | function-definition | |
5871 | template-declaration | |
5872 | explicit-instantiation | |
5873 | explicit-specialization | |
5874 | linkage-specification | |
1092805d MM |
5875 | namespace-definition |
5876 | ||
5877 | GNU extension: | |
5878 | ||
5879 | declaration: | |
5880 | __extension__ declaration */ | |
a723baf1 MM |
5881 | |
5882 | static void | |
94edc4ab | 5883 | cp_parser_declaration (cp_parser* parser) |
a723baf1 MM |
5884 | { |
5885 | cp_token token1; | |
5886 | cp_token token2; | |
1092805d MM |
5887 | int saved_pedantic; |
5888 | ||
5889 | /* Check for the `__extension__' keyword. */ | |
5890 | if (cp_parser_extension_opt (parser, &saved_pedantic)) | |
5891 | { | |
5892 | /* Parse the qualified declaration. */ | |
5893 | cp_parser_declaration (parser); | |
5894 | /* Restore the PEDANTIC flag. */ | |
5895 | pedantic = saved_pedantic; | |
5896 | ||
5897 | return; | |
5898 | } | |
a723baf1 MM |
5899 | |
5900 | /* Try to figure out what kind of declaration is present. */ | |
5901 | token1 = *cp_lexer_peek_token (parser->lexer); | |
5902 | if (token1.type != CPP_EOF) | |
5903 | token2 = *cp_lexer_peek_nth_token (parser->lexer, 2); | |
5904 | ||
5905 | /* If the next token is `extern' and the following token is a string | |
5906 | literal, then we have a linkage specification. */ | |
5907 | if (token1.keyword == RID_EXTERN | |
5908 | && cp_parser_is_string_literal (&token2)) | |
5909 | cp_parser_linkage_specification (parser); | |
5910 | /* If the next token is `template', then we have either a template | |
5911 | declaration, an explicit instantiation, or an explicit | |
5912 | specialization. */ | |
5913 | else if (token1.keyword == RID_TEMPLATE) | |
5914 | { | |
5915 | /* `template <>' indicates a template specialization. */ | |
5916 | if (token2.type == CPP_LESS | |
5917 | && cp_lexer_peek_nth_token (parser->lexer, 3)->type == CPP_GREATER) | |
5918 | cp_parser_explicit_specialization (parser); | |
5919 | /* `template <' indicates a template declaration. */ | |
5920 | else if (token2.type == CPP_LESS) | |
5921 | cp_parser_template_declaration (parser, /*member_p=*/false); | |
5922 | /* Anything else must be an explicit instantiation. */ | |
5923 | else | |
5924 | cp_parser_explicit_instantiation (parser); | |
5925 | } | |
5926 | /* If the next token is `export', then we have a template | |
5927 | declaration. */ | |
5928 | else if (token1.keyword == RID_EXPORT) | |
5929 | cp_parser_template_declaration (parser, /*member_p=*/false); | |
5930 | /* If the next token is `extern', 'static' or 'inline' and the one | |
5931 | after that is `template', we have a GNU extended explicit | |
5932 | instantiation directive. */ | |
5933 | else if (cp_parser_allow_gnu_extensions_p (parser) | |
5934 | && (token1.keyword == RID_EXTERN | |
5935 | || token1.keyword == RID_STATIC | |
5936 | || token1.keyword == RID_INLINE) | |
5937 | && token2.keyword == RID_TEMPLATE) | |
5938 | cp_parser_explicit_instantiation (parser); | |
5939 | /* If the next token is `namespace', check for a named or unnamed | |
5940 | namespace definition. */ | |
5941 | else if (token1.keyword == RID_NAMESPACE | |
5942 | && (/* A named namespace definition. */ | |
5943 | (token2.type == CPP_NAME | |
5944 | && (cp_lexer_peek_nth_token (parser->lexer, 3)->type | |
5945 | == CPP_OPEN_BRACE)) | |
5946 | /* An unnamed namespace definition. */ | |
5947 | || token2.type == CPP_OPEN_BRACE)) | |
5948 | cp_parser_namespace_definition (parser); | |
5949 | /* We must have either a block declaration or a function | |
5950 | definition. */ | |
5951 | else | |
5952 | /* Try to parse a block-declaration, or a function-definition. */ | |
5953 | cp_parser_block_declaration (parser, /*statement_p=*/false); | |
5954 | } | |
5955 | ||
5956 | /* Parse a block-declaration. | |
5957 | ||
5958 | block-declaration: | |
5959 | simple-declaration | |
5960 | asm-definition | |
5961 | namespace-alias-definition | |
5962 | using-declaration | |
5963 | using-directive | |
5964 | ||
5965 | GNU Extension: | |
5966 | ||
5967 | block-declaration: | |
5968 | __extension__ block-declaration | |
5969 | label-declaration | |
5970 | ||
34cd5ae7 | 5971 | If STATEMENT_P is TRUE, then this block-declaration is occurring as |
a723baf1 MM |
5972 | part of a declaration-statement. */ |
5973 | ||
5974 | static void | |
5975 | cp_parser_block_declaration (cp_parser *parser, | |
5976 | bool statement_p) | |
5977 | { | |
5978 | cp_token *token1; | |
5979 | int saved_pedantic; | |
5980 | ||
5981 | /* Check for the `__extension__' keyword. */ | |
5982 | if (cp_parser_extension_opt (parser, &saved_pedantic)) | |
5983 | { | |
5984 | /* Parse the qualified declaration. */ | |
5985 | cp_parser_block_declaration (parser, statement_p); | |
5986 | /* Restore the PEDANTIC flag. */ | |
5987 | pedantic = saved_pedantic; | |
5988 | ||
5989 | return; | |
5990 | } | |
5991 | ||
5992 | /* Peek at the next token to figure out which kind of declaration is | |
5993 | present. */ | |
5994 | token1 = cp_lexer_peek_token (parser->lexer); | |
5995 | ||
5996 | /* If the next keyword is `asm', we have an asm-definition. */ | |
5997 | if (token1->keyword == RID_ASM) | |
5998 | { | |
5999 | if (statement_p) | |
6000 | cp_parser_commit_to_tentative_parse (parser); | |
6001 | cp_parser_asm_definition (parser); | |
6002 | } | |
6003 | /* If the next keyword is `namespace', we have a | |
6004 | namespace-alias-definition. */ | |
6005 | else if (token1->keyword == RID_NAMESPACE) | |
6006 | cp_parser_namespace_alias_definition (parser); | |
6007 | /* If the next keyword is `using', we have either a | |
6008 | using-declaration or a using-directive. */ | |
6009 | else if (token1->keyword == RID_USING) | |
6010 | { | |
6011 | cp_token *token2; | |
6012 | ||
6013 | if (statement_p) | |
6014 | cp_parser_commit_to_tentative_parse (parser); | |
6015 | /* If the token after `using' is `namespace', then we have a | |
6016 | using-directive. */ | |
6017 | token2 = cp_lexer_peek_nth_token (parser->lexer, 2); | |
6018 | if (token2->keyword == RID_NAMESPACE) | |
6019 | cp_parser_using_directive (parser); | |
6020 | /* Otherwise, it's a using-declaration. */ | |
6021 | else | |
6022 | cp_parser_using_declaration (parser); | |
6023 | } | |
6024 | /* If the next keyword is `__label__' we have a label declaration. */ | |
6025 | else if (token1->keyword == RID_LABEL) | |
6026 | { | |
6027 | if (statement_p) | |
6028 | cp_parser_commit_to_tentative_parse (parser); | |
6029 | cp_parser_label_declaration (parser); | |
6030 | } | |
6031 | /* Anything else must be a simple-declaration. */ | |
6032 | else | |
6033 | cp_parser_simple_declaration (parser, !statement_p); | |
6034 | } | |
6035 | ||
6036 | /* Parse a simple-declaration. | |
6037 | ||
6038 | simple-declaration: | |
6039 | decl-specifier-seq [opt] init-declarator-list [opt] ; | |
6040 | ||
6041 | init-declarator-list: | |
6042 | init-declarator | |
6043 | init-declarator-list , init-declarator | |
6044 | ||
34cd5ae7 | 6045 | If FUNCTION_DEFINITION_ALLOWED_P is TRUE, then we also recognize a |
9bcb9aae | 6046 | function-definition as a simple-declaration. */ |
a723baf1 MM |
6047 | |
6048 | static void | |
94edc4ab NN |
6049 | cp_parser_simple_declaration (cp_parser* parser, |
6050 | bool function_definition_allowed_p) | |
a723baf1 MM |
6051 | { |
6052 | tree decl_specifiers; | |
6053 | tree attributes; | |
a723baf1 MM |
6054 | bool declares_class_or_enum; |
6055 | bool saw_declarator; | |
6056 | ||
6057 | /* Defer access checks until we know what is being declared; the | |
6058 | checks for names appearing in the decl-specifier-seq should be | |
6059 | done as if we were in the scope of the thing being declared. */ | |
8d241e0b | 6060 | push_deferring_access_checks (dk_deferred); |
cf22909c | 6061 | |
a723baf1 MM |
6062 | /* Parse the decl-specifier-seq. We have to keep track of whether |
6063 | or not the decl-specifier-seq declares a named class or | |
6064 | enumeration type, since that is the only case in which the | |
6065 | init-declarator-list is allowed to be empty. | |
6066 | ||
6067 | [dcl.dcl] | |
6068 | ||
6069 | In a simple-declaration, the optional init-declarator-list can be | |
6070 | omitted only when declaring a class or enumeration, that is when | |
6071 | the decl-specifier-seq contains either a class-specifier, an | |
6072 | elaborated-type-specifier, or an enum-specifier. */ | |
6073 | decl_specifiers | |
6074 | = cp_parser_decl_specifier_seq (parser, | |
6075 | CP_PARSER_FLAGS_OPTIONAL, | |
6076 | &attributes, | |
6077 | &declares_class_or_enum); | |
6078 | /* We no longer need to defer access checks. */ | |
cf22909c | 6079 | stop_deferring_access_checks (); |
24c0ef37 | 6080 | |
39703eb9 MM |
6081 | /* In a block scope, a valid declaration must always have a |
6082 | decl-specifier-seq. By not trying to parse declarators, we can | |
6083 | resolve the declaration/expression ambiguity more quickly. */ | |
6084 | if (!function_definition_allowed_p && !decl_specifiers) | |
6085 | { | |
6086 | cp_parser_error (parser, "expected declaration"); | |
6087 | goto done; | |
6088 | } | |
6089 | ||
8fbc5ae7 MM |
6090 | /* If the next two tokens are both identifiers, the code is |
6091 | erroneous. The usual cause of this situation is code like: | |
6092 | ||
6093 | T t; | |
6094 | ||
6095 | where "T" should name a type -- but does not. */ | |
6096 | if (cp_parser_diagnose_invalid_type_name (parser)) | |
6097 | { | |
8d241e0b | 6098 | /* If parsing tentatively, we should commit; we really are |
8fbc5ae7 MM |
6099 | looking at a declaration. */ |
6100 | cp_parser_commit_to_tentative_parse (parser); | |
6101 | /* Give up. */ | |
39703eb9 | 6102 | goto done; |
8fbc5ae7 MM |
6103 | } |
6104 | ||
a723baf1 MM |
6105 | /* Keep going until we hit the `;' at the end of the simple |
6106 | declaration. */ | |
6107 | saw_declarator = false; | |
6108 | while (cp_lexer_next_token_is_not (parser->lexer, | |
6109 | CPP_SEMICOLON)) | |
6110 | { | |
6111 | cp_token *token; | |
6112 | bool function_definition_p; | |
6113 | ||
6114 | saw_declarator = true; | |
6115 | /* Parse the init-declarator. */ | |
6116 | cp_parser_init_declarator (parser, decl_specifiers, attributes, | |
a723baf1 MM |
6117 | function_definition_allowed_p, |
6118 | /*member_p=*/false, | |
6119 | &function_definition_p); | |
1fb3244a MM |
6120 | /* If an error occurred while parsing tentatively, exit quickly. |
6121 | (That usually happens when in the body of a function; each | |
6122 | statement is treated as a declaration-statement until proven | |
6123 | otherwise.) */ | |
6124 | if (cp_parser_error_occurred (parser)) | |
39703eb9 | 6125 | goto done; |
a723baf1 MM |
6126 | /* Handle function definitions specially. */ |
6127 | if (function_definition_p) | |
6128 | { | |
6129 | /* If the next token is a `,', then we are probably | |
6130 | processing something like: | |
6131 | ||
6132 | void f() {}, *p; | |
6133 | ||
6134 | which is erroneous. */ | |
6135 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
6136 | error ("mixing declarations and function-definitions is forbidden"); | |
6137 | /* Otherwise, we're done with the list of declarators. */ | |
6138 | else | |
24c0ef37 | 6139 | { |
cf22909c | 6140 | pop_deferring_access_checks (); |
24c0ef37 GS |
6141 | return; |
6142 | } | |
a723baf1 MM |
6143 | } |
6144 | /* The next token should be either a `,' or a `;'. */ | |
6145 | token = cp_lexer_peek_token (parser->lexer); | |
6146 | /* If it's a `,', there are more declarators to come. */ | |
6147 | if (token->type == CPP_COMMA) | |
6148 | cp_lexer_consume_token (parser->lexer); | |
6149 | /* If it's a `;', we are done. */ | |
6150 | else if (token->type == CPP_SEMICOLON) | |
6151 | break; | |
6152 | /* Anything else is an error. */ | |
6153 | else | |
6154 | { | |
6155 | cp_parser_error (parser, "expected `,' or `;'"); | |
6156 | /* Skip tokens until we reach the end of the statement. */ | |
6157 | cp_parser_skip_to_end_of_statement (parser); | |
39703eb9 | 6158 | goto done; |
a723baf1 MM |
6159 | } |
6160 | /* After the first time around, a function-definition is not | |
6161 | allowed -- even if it was OK at first. For example: | |
6162 | ||
6163 | int i, f() {} | |
6164 | ||
6165 | is not valid. */ | |
6166 | function_definition_allowed_p = false; | |
6167 | } | |
6168 | ||
6169 | /* Issue an error message if no declarators are present, and the | |
6170 | decl-specifier-seq does not itself declare a class or | |
6171 | enumeration. */ | |
6172 | if (!saw_declarator) | |
6173 | { | |
6174 | if (cp_parser_declares_only_class_p (parser)) | |
6175 | shadow_tag (decl_specifiers); | |
6176 | /* Perform any deferred access checks. */ | |
cf22909c | 6177 | perform_deferred_access_checks (); |
a723baf1 MM |
6178 | } |
6179 | ||
6180 | /* Consume the `;'. */ | |
6181 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6182 | ||
6183 | /* Mark all the classes that appeared in the decl-specifier-seq as | |
6184 | having received a `;'. */ | |
6185 | note_list_got_semicolon (decl_specifiers); | |
39703eb9 MM |
6186 | |
6187 | done: | |
6188 | pop_deferring_access_checks (); | |
a723baf1 MM |
6189 | } |
6190 | ||
6191 | /* Parse a decl-specifier-seq. | |
6192 | ||
6193 | decl-specifier-seq: | |
6194 | decl-specifier-seq [opt] decl-specifier | |
6195 | ||
6196 | decl-specifier: | |
6197 | storage-class-specifier | |
6198 | type-specifier | |
6199 | function-specifier | |
6200 | friend | |
6201 | typedef | |
6202 | ||
6203 | GNU Extension: | |
6204 | ||
6205 | decl-specifier-seq: | |
6206 | decl-specifier-seq [opt] attributes | |
6207 | ||
6208 | Returns a TREE_LIST, giving the decl-specifiers in the order they | |
6209 | appear in the source code. The TREE_VALUE of each node is the | |
6210 | decl-specifier. For a keyword (such as `auto' or `friend'), the | |
34cd5ae7 | 6211 | TREE_VALUE is simply the corresponding TREE_IDENTIFIER. For the |
a723baf1 MM |
6212 | representation of a type-specifier, see cp_parser_type_specifier. |
6213 | ||
6214 | If there are attributes, they will be stored in *ATTRIBUTES, | |
6215 | represented as described above cp_parser_attributes. | |
6216 | ||
6217 | If FRIEND_IS_NOT_CLASS_P is non-NULL, and the `friend' specifier | |
6218 | appears, and the entity that will be a friend is not going to be a | |
6219 | class, then *FRIEND_IS_NOT_CLASS_P will be set to TRUE. Note that | |
6220 | even if *FRIEND_IS_NOT_CLASS_P is FALSE, the entity to which | |
6221 | friendship is granted might not be a class. */ | |
6222 | ||
6223 | static tree | |
94edc4ab NN |
6224 | cp_parser_decl_specifier_seq (cp_parser* parser, |
6225 | cp_parser_flags flags, | |
6226 | tree* attributes, | |
6227 | bool* declares_class_or_enum) | |
a723baf1 MM |
6228 | { |
6229 | tree decl_specs = NULL_TREE; | |
6230 | bool friend_p = false; | |
f2ce60b8 NS |
6231 | bool constructor_possible_p = !parser->in_declarator_p; |
6232 | ||
a723baf1 MM |
6233 | /* Assume no class or enumeration type is declared. */ |
6234 | *declares_class_or_enum = false; | |
6235 | ||
6236 | /* Assume there are no attributes. */ | |
6237 | *attributes = NULL_TREE; | |
6238 | ||
6239 | /* Keep reading specifiers until there are no more to read. */ | |
6240 | while (true) | |
6241 | { | |
6242 | tree decl_spec = NULL_TREE; | |
6243 | bool constructor_p; | |
6244 | cp_token *token; | |
6245 | ||
6246 | /* Peek at the next token. */ | |
6247 | token = cp_lexer_peek_token (parser->lexer); | |
6248 | /* Handle attributes. */ | |
6249 | if (token->keyword == RID_ATTRIBUTE) | |
6250 | { | |
6251 | /* Parse the attributes. */ | |
6252 | decl_spec = cp_parser_attributes_opt (parser); | |
6253 | /* Add them to the list. */ | |
6254 | *attributes = chainon (*attributes, decl_spec); | |
6255 | continue; | |
6256 | } | |
6257 | /* If the next token is an appropriate keyword, we can simply | |
6258 | add it to the list. */ | |
6259 | switch (token->keyword) | |
6260 | { | |
6261 | case RID_FRIEND: | |
6262 | /* decl-specifier: | |
6263 | friend */ | |
6264 | friend_p = true; | |
6265 | /* The representation of the specifier is simply the | |
6266 | appropriate TREE_IDENTIFIER node. */ | |
6267 | decl_spec = token->value; | |
6268 | /* Consume the token. */ | |
6269 | cp_lexer_consume_token (parser->lexer); | |
6270 | break; | |
6271 | ||
6272 | /* function-specifier: | |
6273 | inline | |
6274 | virtual | |
6275 | explicit */ | |
6276 | case RID_INLINE: | |
6277 | case RID_VIRTUAL: | |
6278 | case RID_EXPLICIT: | |
6279 | decl_spec = cp_parser_function_specifier_opt (parser); | |
6280 | break; | |
6281 | ||
6282 | /* decl-specifier: | |
6283 | typedef */ | |
6284 | case RID_TYPEDEF: | |
6285 | /* The representation of the specifier is simply the | |
6286 | appropriate TREE_IDENTIFIER node. */ | |
6287 | decl_spec = token->value; | |
6288 | /* Consume the token. */ | |
6289 | cp_lexer_consume_token (parser->lexer); | |
2050a1bb MM |
6290 | /* A constructor declarator cannot appear in a typedef. */ |
6291 | constructor_possible_p = false; | |
c006d942 MM |
6292 | /* The "typedef" keyword can only occur in a declaration; we |
6293 | may as well commit at this point. */ | |
6294 | cp_parser_commit_to_tentative_parse (parser); | |
a723baf1 MM |
6295 | break; |
6296 | ||
6297 | /* storage-class-specifier: | |
6298 | auto | |
6299 | register | |
6300 | static | |
6301 | extern | |
6302 | mutable | |
6303 | ||
6304 | GNU Extension: | |
6305 | thread */ | |
6306 | case RID_AUTO: | |
6307 | case RID_REGISTER: | |
6308 | case RID_STATIC: | |
6309 | case RID_EXTERN: | |
6310 | case RID_MUTABLE: | |
6311 | case RID_THREAD: | |
6312 | decl_spec = cp_parser_storage_class_specifier_opt (parser); | |
6313 | break; | |
6314 | ||
6315 | default: | |
6316 | break; | |
6317 | } | |
6318 | ||
6319 | /* Constructors are a special case. The `S' in `S()' is not a | |
6320 | decl-specifier; it is the beginning of the declarator. */ | |
6321 | constructor_p = (!decl_spec | |
2050a1bb | 6322 | && constructor_possible_p |
a723baf1 MM |
6323 | && cp_parser_constructor_declarator_p (parser, |
6324 | friend_p)); | |
6325 | ||
6326 | /* If we don't have a DECL_SPEC yet, then we must be looking at | |
6327 | a type-specifier. */ | |
6328 | if (!decl_spec && !constructor_p) | |
6329 | { | |
6330 | bool decl_spec_declares_class_or_enum; | |
6331 | bool is_cv_qualifier; | |
6332 | ||
6333 | decl_spec | |
6334 | = cp_parser_type_specifier (parser, flags, | |
6335 | friend_p, | |
6336 | /*is_declaration=*/true, | |
6337 | &decl_spec_declares_class_or_enum, | |
6338 | &is_cv_qualifier); | |
6339 | ||
6340 | *declares_class_or_enum |= decl_spec_declares_class_or_enum; | |
6341 | ||
6342 | /* If this type-specifier referenced a user-defined type | |
6343 | (a typedef, class-name, etc.), then we can't allow any | |
6344 | more such type-specifiers henceforth. | |
6345 | ||
6346 | [dcl.spec] | |
6347 | ||
6348 | The longest sequence of decl-specifiers that could | |
6349 | possibly be a type name is taken as the | |
6350 | decl-specifier-seq of a declaration. The sequence shall | |
6351 | be self-consistent as described below. | |
6352 | ||
6353 | [dcl.type] | |
6354 | ||
6355 | As a general rule, at most one type-specifier is allowed | |
6356 | in the complete decl-specifier-seq of a declaration. The | |
6357 | only exceptions are the following: | |
6358 | ||
6359 | -- const or volatile can be combined with any other | |
6360 | type-specifier. | |
6361 | ||
6362 | -- signed or unsigned can be combined with char, long, | |
6363 | short, or int. | |
6364 | ||
6365 | -- .. | |
6366 | ||
6367 | Example: | |
6368 | ||
6369 | typedef char* Pc; | |
6370 | void g (const int Pc); | |
6371 | ||
6372 | Here, Pc is *not* part of the decl-specifier seq; it's | |
6373 | the declarator. Therefore, once we see a type-specifier | |
6374 | (other than a cv-qualifier), we forbid any additional | |
6375 | user-defined types. We *do* still allow things like `int | |
6376 | int' to be considered a decl-specifier-seq, and issue the | |
6377 | error message later. */ | |
6378 | if (decl_spec && !is_cv_qualifier) | |
6379 | flags |= CP_PARSER_FLAGS_NO_USER_DEFINED_TYPES; | |
2050a1bb MM |
6380 | /* A constructor declarator cannot follow a type-specifier. */ |
6381 | if (decl_spec) | |
6382 | constructor_possible_p = false; | |
a723baf1 MM |
6383 | } |
6384 | ||
6385 | /* If we still do not have a DECL_SPEC, then there are no more | |
6386 | decl-specifiers. */ | |
6387 | if (!decl_spec) | |
6388 | { | |
6389 | /* Issue an error message, unless the entire construct was | |
6390 | optional. */ | |
6391 | if (!(flags & CP_PARSER_FLAGS_OPTIONAL)) | |
6392 | { | |
6393 | cp_parser_error (parser, "expected decl specifier"); | |
6394 | return error_mark_node; | |
6395 | } | |
6396 | ||
6397 | break; | |
6398 | } | |
6399 | ||
6400 | /* Add the DECL_SPEC to the list of specifiers. */ | |
6401 | decl_specs = tree_cons (NULL_TREE, decl_spec, decl_specs); | |
6402 | ||
6403 | /* After we see one decl-specifier, further decl-specifiers are | |
6404 | always optional. */ | |
6405 | flags |= CP_PARSER_FLAGS_OPTIONAL; | |
6406 | } | |
6407 | ||
6408 | /* We have built up the DECL_SPECS in reverse order. Return them in | |
6409 | the correct order. */ | |
6410 | return nreverse (decl_specs); | |
6411 | } | |
6412 | ||
6413 | /* Parse an (optional) storage-class-specifier. | |
6414 | ||
6415 | storage-class-specifier: | |
6416 | auto | |
6417 | register | |
6418 | static | |
6419 | extern | |
6420 | mutable | |
6421 | ||
6422 | GNU Extension: | |
6423 | ||
6424 | storage-class-specifier: | |
6425 | thread | |
6426 | ||
6427 | Returns an IDENTIFIER_NODE corresponding to the keyword used. */ | |
6428 | ||
6429 | static tree | |
94edc4ab | 6430 | cp_parser_storage_class_specifier_opt (cp_parser* parser) |
a723baf1 MM |
6431 | { |
6432 | switch (cp_lexer_peek_token (parser->lexer)->keyword) | |
6433 | { | |
6434 | case RID_AUTO: | |
6435 | case RID_REGISTER: | |
6436 | case RID_STATIC: | |
6437 | case RID_EXTERN: | |
6438 | case RID_MUTABLE: | |
6439 | case RID_THREAD: | |
6440 | /* Consume the token. */ | |
6441 | return cp_lexer_consume_token (parser->lexer)->value; | |
6442 | ||
6443 | default: | |
6444 | return NULL_TREE; | |
6445 | } | |
6446 | } | |
6447 | ||
6448 | /* Parse an (optional) function-specifier. | |
6449 | ||
6450 | function-specifier: | |
6451 | inline | |
6452 | virtual | |
6453 | explicit | |
6454 | ||
6455 | Returns an IDENTIFIER_NODE corresponding to the keyword used. */ | |
6456 | ||
6457 | static tree | |
94edc4ab | 6458 | cp_parser_function_specifier_opt (cp_parser* parser) |
a723baf1 MM |
6459 | { |
6460 | switch (cp_lexer_peek_token (parser->lexer)->keyword) | |
6461 | { | |
6462 | case RID_INLINE: | |
6463 | case RID_VIRTUAL: | |
6464 | case RID_EXPLICIT: | |
6465 | /* Consume the token. */ | |
6466 | return cp_lexer_consume_token (parser->lexer)->value; | |
6467 | ||
6468 | default: | |
6469 | return NULL_TREE; | |
6470 | } | |
6471 | } | |
6472 | ||
6473 | /* Parse a linkage-specification. | |
6474 | ||
6475 | linkage-specification: | |
6476 | extern string-literal { declaration-seq [opt] } | |
6477 | extern string-literal declaration */ | |
6478 | ||
6479 | static void | |
94edc4ab | 6480 | cp_parser_linkage_specification (cp_parser* parser) |
a723baf1 MM |
6481 | { |
6482 | cp_token *token; | |
6483 | tree linkage; | |
6484 | ||
6485 | /* Look for the `extern' keyword. */ | |
6486 | cp_parser_require_keyword (parser, RID_EXTERN, "`extern'"); | |
6487 | ||
6488 | /* Peek at the next token. */ | |
6489 | token = cp_lexer_peek_token (parser->lexer); | |
6490 | /* If it's not a string-literal, then there's a problem. */ | |
6491 | if (!cp_parser_is_string_literal (token)) | |
6492 | { | |
6493 | cp_parser_error (parser, "expected language-name"); | |
6494 | return; | |
6495 | } | |
6496 | /* Consume the token. */ | |
6497 | cp_lexer_consume_token (parser->lexer); | |
6498 | ||
6499 | /* Transform the literal into an identifier. If the literal is a | |
6500 | wide-character string, or contains embedded NULs, then we can't | |
6501 | handle it as the user wants. */ | |
6502 | if (token->type == CPP_WSTRING | |
6503 | || (strlen (TREE_STRING_POINTER (token->value)) | |
6504 | != (size_t) (TREE_STRING_LENGTH (token->value) - 1))) | |
6505 | { | |
6506 | cp_parser_error (parser, "invalid linkage-specification"); | |
6507 | /* Assume C++ linkage. */ | |
6508 | linkage = get_identifier ("c++"); | |
6509 | } | |
6510 | /* If it's a simple string constant, things are easier. */ | |
6511 | else | |
6512 | linkage = get_identifier (TREE_STRING_POINTER (token->value)); | |
6513 | ||
6514 | /* We're now using the new linkage. */ | |
6515 | push_lang_context (linkage); | |
6516 | ||
6517 | /* If the next token is a `{', then we're using the first | |
6518 | production. */ | |
6519 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)) | |
6520 | { | |
6521 | /* Consume the `{' token. */ | |
6522 | cp_lexer_consume_token (parser->lexer); | |
6523 | /* Parse the declarations. */ | |
6524 | cp_parser_declaration_seq_opt (parser); | |
6525 | /* Look for the closing `}'. */ | |
6526 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
6527 | } | |
6528 | /* Otherwise, there's just one declaration. */ | |
6529 | else | |
6530 | { | |
6531 | bool saved_in_unbraced_linkage_specification_p; | |
6532 | ||
6533 | saved_in_unbraced_linkage_specification_p | |
6534 | = parser->in_unbraced_linkage_specification_p; | |
6535 | parser->in_unbraced_linkage_specification_p = true; | |
6536 | have_extern_spec = true; | |
6537 | cp_parser_declaration (parser); | |
6538 | have_extern_spec = false; | |
6539 | parser->in_unbraced_linkage_specification_p | |
6540 | = saved_in_unbraced_linkage_specification_p; | |
6541 | } | |
6542 | ||
6543 | /* We're done with the linkage-specification. */ | |
6544 | pop_lang_context (); | |
6545 | } | |
6546 | ||
6547 | /* Special member functions [gram.special] */ | |
6548 | ||
6549 | /* Parse a conversion-function-id. | |
6550 | ||
6551 | conversion-function-id: | |
6552 | operator conversion-type-id | |
6553 | ||
6554 | Returns an IDENTIFIER_NODE representing the operator. */ | |
6555 | ||
6556 | static tree | |
94edc4ab | 6557 | cp_parser_conversion_function_id (cp_parser* parser) |
a723baf1 MM |
6558 | { |
6559 | tree type; | |
6560 | tree saved_scope; | |
6561 | tree saved_qualifying_scope; | |
6562 | tree saved_object_scope; | |
6563 | ||
6564 | /* Look for the `operator' token. */ | |
6565 | if (!cp_parser_require_keyword (parser, RID_OPERATOR, "`operator'")) | |
6566 | return error_mark_node; | |
6567 | /* When we parse the conversion-type-id, the current scope will be | |
6568 | reset. However, we need that information in able to look up the | |
6569 | conversion function later, so we save it here. */ | |
6570 | saved_scope = parser->scope; | |
6571 | saved_qualifying_scope = parser->qualifying_scope; | |
6572 | saved_object_scope = parser->object_scope; | |
6573 | /* We must enter the scope of the class so that the names of | |
6574 | entities declared within the class are available in the | |
6575 | conversion-type-id. For example, consider: | |
6576 | ||
6577 | struct S { | |
6578 | typedef int I; | |
6579 | operator I(); | |
6580 | }; | |
6581 | ||
6582 | S::operator I() { ... } | |
6583 | ||
6584 | In order to see that `I' is a type-name in the definition, we | |
6585 | must be in the scope of `S'. */ | |
6586 | if (saved_scope) | |
6587 | push_scope (saved_scope); | |
6588 | /* Parse the conversion-type-id. */ | |
6589 | type = cp_parser_conversion_type_id (parser); | |
6590 | /* Leave the scope of the class, if any. */ | |
6591 | if (saved_scope) | |
6592 | pop_scope (saved_scope); | |
6593 | /* Restore the saved scope. */ | |
6594 | parser->scope = saved_scope; | |
6595 | parser->qualifying_scope = saved_qualifying_scope; | |
6596 | parser->object_scope = saved_object_scope; | |
6597 | /* If the TYPE is invalid, indicate failure. */ | |
6598 | if (type == error_mark_node) | |
6599 | return error_mark_node; | |
6600 | return mangle_conv_op_name_for_type (type); | |
6601 | } | |
6602 | ||
6603 | /* Parse a conversion-type-id: | |
6604 | ||
6605 | conversion-type-id: | |
6606 | type-specifier-seq conversion-declarator [opt] | |
6607 | ||
6608 | Returns the TYPE specified. */ | |
6609 | ||
6610 | static tree | |
94edc4ab | 6611 | cp_parser_conversion_type_id (cp_parser* parser) |
a723baf1 MM |
6612 | { |
6613 | tree attributes; | |
6614 | tree type_specifiers; | |
6615 | tree declarator; | |
6616 | ||
6617 | /* Parse the attributes. */ | |
6618 | attributes = cp_parser_attributes_opt (parser); | |
6619 | /* Parse the type-specifiers. */ | |
6620 | type_specifiers = cp_parser_type_specifier_seq (parser); | |
6621 | /* If that didn't work, stop. */ | |
6622 | if (type_specifiers == error_mark_node) | |
6623 | return error_mark_node; | |
6624 | /* Parse the conversion-declarator. */ | |
6625 | declarator = cp_parser_conversion_declarator_opt (parser); | |
6626 | ||
6627 | return grokdeclarator (declarator, type_specifiers, TYPENAME, | |
6628 | /*initialized=*/0, &attributes); | |
6629 | } | |
6630 | ||
6631 | /* Parse an (optional) conversion-declarator. | |
6632 | ||
6633 | conversion-declarator: | |
6634 | ptr-operator conversion-declarator [opt] | |
6635 | ||
6636 | Returns a representation of the declarator. See | |
6637 | cp_parser_declarator for details. */ | |
6638 | ||
6639 | static tree | |
94edc4ab | 6640 | cp_parser_conversion_declarator_opt (cp_parser* parser) |
a723baf1 MM |
6641 | { |
6642 | enum tree_code code; | |
6643 | tree class_type; | |
6644 | tree cv_qualifier_seq; | |
6645 | ||
6646 | /* We don't know if there's a ptr-operator next, or not. */ | |
6647 | cp_parser_parse_tentatively (parser); | |
6648 | /* Try the ptr-operator. */ | |
6649 | code = cp_parser_ptr_operator (parser, &class_type, | |
6650 | &cv_qualifier_seq); | |
6651 | /* If it worked, look for more conversion-declarators. */ | |
6652 | if (cp_parser_parse_definitely (parser)) | |
6653 | { | |
6654 | tree declarator; | |
6655 | ||
6656 | /* Parse another optional declarator. */ | |
6657 | declarator = cp_parser_conversion_declarator_opt (parser); | |
6658 | ||
6659 | /* Create the representation of the declarator. */ | |
6660 | if (code == INDIRECT_REF) | |
6661 | declarator = make_pointer_declarator (cv_qualifier_seq, | |
6662 | declarator); | |
6663 | else | |
6664 | declarator = make_reference_declarator (cv_qualifier_seq, | |
6665 | declarator); | |
6666 | ||
6667 | /* Handle the pointer-to-member case. */ | |
6668 | if (class_type) | |
6669 | declarator = build_nt (SCOPE_REF, class_type, declarator); | |
6670 | ||
6671 | return declarator; | |
6672 | } | |
6673 | ||
6674 | return NULL_TREE; | |
6675 | } | |
6676 | ||
6677 | /* Parse an (optional) ctor-initializer. | |
6678 | ||
6679 | ctor-initializer: | |
6680 | : mem-initializer-list | |
6681 | ||
6682 | Returns TRUE iff the ctor-initializer was actually present. */ | |
6683 | ||
6684 | static bool | |
94edc4ab | 6685 | cp_parser_ctor_initializer_opt (cp_parser* parser) |
a723baf1 MM |
6686 | { |
6687 | /* If the next token is not a `:', then there is no | |
6688 | ctor-initializer. */ | |
6689 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COLON)) | |
6690 | { | |
6691 | /* Do default initialization of any bases and members. */ | |
6692 | if (DECL_CONSTRUCTOR_P (current_function_decl)) | |
6693 | finish_mem_initializers (NULL_TREE); | |
6694 | ||
6695 | return false; | |
6696 | } | |
6697 | ||
6698 | /* Consume the `:' token. */ | |
6699 | cp_lexer_consume_token (parser->lexer); | |
6700 | /* And the mem-initializer-list. */ | |
6701 | cp_parser_mem_initializer_list (parser); | |
6702 | ||
6703 | return true; | |
6704 | } | |
6705 | ||
6706 | /* Parse a mem-initializer-list. | |
6707 | ||
6708 | mem-initializer-list: | |
6709 | mem-initializer | |
6710 | mem-initializer , mem-initializer-list */ | |
6711 | ||
6712 | static void | |
94edc4ab | 6713 | cp_parser_mem_initializer_list (cp_parser* parser) |
a723baf1 MM |
6714 | { |
6715 | tree mem_initializer_list = NULL_TREE; | |
6716 | ||
6717 | /* Let the semantic analysis code know that we are starting the | |
6718 | mem-initializer-list. */ | |
0e136342 MM |
6719 | if (!DECL_CONSTRUCTOR_P (current_function_decl)) |
6720 | error ("only constructors take base initializers"); | |
a723baf1 MM |
6721 | |
6722 | /* Loop through the list. */ | |
6723 | while (true) | |
6724 | { | |
6725 | tree mem_initializer; | |
6726 | ||
6727 | /* Parse the mem-initializer. */ | |
6728 | mem_initializer = cp_parser_mem_initializer (parser); | |
6729 | /* Add it to the list, unless it was erroneous. */ | |
6730 | if (mem_initializer) | |
6731 | { | |
6732 | TREE_CHAIN (mem_initializer) = mem_initializer_list; | |
6733 | mem_initializer_list = mem_initializer; | |
6734 | } | |
6735 | /* If the next token is not a `,', we're done. */ | |
6736 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
6737 | break; | |
6738 | /* Consume the `,' token. */ | |
6739 | cp_lexer_consume_token (parser->lexer); | |
6740 | } | |
6741 | ||
6742 | /* Perform semantic analysis. */ | |
0e136342 MM |
6743 | if (DECL_CONSTRUCTOR_P (current_function_decl)) |
6744 | finish_mem_initializers (mem_initializer_list); | |
a723baf1 MM |
6745 | } |
6746 | ||
6747 | /* Parse a mem-initializer. | |
6748 | ||
6749 | mem-initializer: | |
6750 | mem-initializer-id ( expression-list [opt] ) | |
6751 | ||
6752 | GNU extension: | |
6753 | ||
6754 | mem-initializer: | |
34cd5ae7 | 6755 | ( expression-list [opt] ) |
a723baf1 MM |
6756 | |
6757 | Returns a TREE_LIST. The TREE_PURPOSE is the TYPE (for a base | |
6758 | class) or FIELD_DECL (for a non-static data member) to initialize; | |
6759 | the TREE_VALUE is the expression-list. */ | |
6760 | ||
6761 | static tree | |
94edc4ab | 6762 | cp_parser_mem_initializer (cp_parser* parser) |
a723baf1 MM |
6763 | { |
6764 | tree mem_initializer_id; | |
6765 | tree expression_list; | |
1f5a253a NS |
6766 | tree member; |
6767 | ||
a723baf1 MM |
6768 | /* Find out what is being initialized. */ |
6769 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
6770 | { | |
6771 | pedwarn ("anachronistic old-style base class initializer"); | |
6772 | mem_initializer_id = NULL_TREE; | |
6773 | } | |
6774 | else | |
6775 | mem_initializer_id = cp_parser_mem_initializer_id (parser); | |
1f5a253a NS |
6776 | member = expand_member_init (mem_initializer_id); |
6777 | if (member && !DECL_P (member)) | |
6778 | in_base_initializer = 1; | |
7efa3e22 | 6779 | |
39703eb9 MM |
6780 | expression_list |
6781 | = cp_parser_parenthesized_expression_list (parser, false, | |
6782 | /*non_constant_p=*/NULL); | |
7efa3e22 | 6783 | if (!expression_list) |
a723baf1 | 6784 | expression_list = void_type_node; |
a723baf1 | 6785 | |
1f5a253a NS |
6786 | in_base_initializer = 0; |
6787 | ||
6788 | return member ? build_tree_list (member, expression_list) : NULL_TREE; | |
a723baf1 MM |
6789 | } |
6790 | ||
6791 | /* Parse a mem-initializer-id. | |
6792 | ||
6793 | mem-initializer-id: | |
6794 | :: [opt] nested-name-specifier [opt] class-name | |
6795 | identifier | |
6796 | ||
6797 | Returns a TYPE indicating the class to be initializer for the first | |
6798 | production. Returns an IDENTIFIER_NODE indicating the data member | |
6799 | to be initialized for the second production. */ | |
6800 | ||
6801 | static tree | |
94edc4ab | 6802 | cp_parser_mem_initializer_id (cp_parser* parser) |
a723baf1 MM |
6803 | { |
6804 | bool global_scope_p; | |
6805 | bool nested_name_specifier_p; | |
6806 | tree id; | |
6807 | ||
6808 | /* Look for the optional `::' operator. */ | |
6809 | global_scope_p | |
6810 | = (cp_parser_global_scope_opt (parser, | |
6811 | /*current_scope_valid_p=*/false) | |
6812 | != NULL_TREE); | |
6813 | /* Look for the optional nested-name-specifier. The simplest way to | |
6814 | implement: | |
6815 | ||
6816 | [temp.res] | |
6817 | ||
6818 | The keyword `typename' is not permitted in a base-specifier or | |
6819 | mem-initializer; in these contexts a qualified name that | |
6820 | depends on a template-parameter is implicitly assumed to be a | |
6821 | type name. | |
6822 | ||
6823 | is to assume that we have seen the `typename' keyword at this | |
6824 | point. */ | |
6825 | nested_name_specifier_p | |
6826 | = (cp_parser_nested_name_specifier_opt (parser, | |
6827 | /*typename_keyword_p=*/true, | |
6828 | /*check_dependency_p=*/true, | |
6829 | /*type_p=*/true) | |
6830 | != NULL_TREE); | |
6831 | /* If there is a `::' operator or a nested-name-specifier, then we | |
6832 | are definitely looking for a class-name. */ | |
6833 | if (global_scope_p || nested_name_specifier_p) | |
6834 | return cp_parser_class_name (parser, | |
6835 | /*typename_keyword_p=*/true, | |
6836 | /*template_keyword_p=*/false, | |
6837 | /*type_p=*/false, | |
a723baf1 MM |
6838 | /*check_dependency_p=*/true, |
6839 | /*class_head_p=*/false); | |
6840 | /* Otherwise, we could also be looking for an ordinary identifier. */ | |
6841 | cp_parser_parse_tentatively (parser); | |
6842 | /* Try a class-name. */ | |
6843 | id = cp_parser_class_name (parser, | |
6844 | /*typename_keyword_p=*/true, | |
6845 | /*template_keyword_p=*/false, | |
6846 | /*type_p=*/false, | |
a723baf1 MM |
6847 | /*check_dependency_p=*/true, |
6848 | /*class_head_p=*/false); | |
6849 | /* If we found one, we're done. */ | |
6850 | if (cp_parser_parse_definitely (parser)) | |
6851 | return id; | |
6852 | /* Otherwise, look for an ordinary identifier. */ | |
6853 | return cp_parser_identifier (parser); | |
6854 | } | |
6855 | ||
6856 | /* Overloading [gram.over] */ | |
6857 | ||
6858 | /* Parse an operator-function-id. | |
6859 | ||
6860 | operator-function-id: | |
6861 | operator operator | |
6862 | ||
6863 | Returns an IDENTIFIER_NODE for the operator which is a | |
6864 | human-readable spelling of the identifier, e.g., `operator +'. */ | |
6865 | ||
6866 | static tree | |
94edc4ab | 6867 | cp_parser_operator_function_id (cp_parser* parser) |
a723baf1 MM |
6868 | { |
6869 | /* Look for the `operator' keyword. */ | |
6870 | if (!cp_parser_require_keyword (parser, RID_OPERATOR, "`operator'")) | |
6871 | return error_mark_node; | |
6872 | /* And then the name of the operator itself. */ | |
6873 | return cp_parser_operator (parser); | |
6874 | } | |
6875 | ||
6876 | /* Parse an operator. | |
6877 | ||
6878 | operator: | |
6879 | new delete new[] delete[] + - * / % ^ & | ~ ! = < > | |
6880 | += -= *= /= %= ^= &= |= << >> >>= <<= == != <= >= && | |
6881 | || ++ -- , ->* -> () [] | |
6882 | ||
6883 | GNU Extensions: | |
6884 | ||
6885 | operator: | |
6886 | <? >? <?= >?= | |
6887 | ||
6888 | Returns an IDENTIFIER_NODE for the operator which is a | |
6889 | human-readable spelling of the identifier, e.g., `operator +'. */ | |
6890 | ||
6891 | static tree | |
94edc4ab | 6892 | cp_parser_operator (cp_parser* parser) |
a723baf1 MM |
6893 | { |
6894 | tree id = NULL_TREE; | |
6895 | cp_token *token; | |
6896 | ||
6897 | /* Peek at the next token. */ | |
6898 | token = cp_lexer_peek_token (parser->lexer); | |
6899 | /* Figure out which operator we have. */ | |
6900 | switch (token->type) | |
6901 | { | |
6902 | case CPP_KEYWORD: | |
6903 | { | |
6904 | enum tree_code op; | |
6905 | ||
6906 | /* The keyword should be either `new' or `delete'. */ | |
6907 | if (token->keyword == RID_NEW) | |
6908 | op = NEW_EXPR; | |
6909 | else if (token->keyword == RID_DELETE) | |
6910 | op = DELETE_EXPR; | |
6911 | else | |
6912 | break; | |
6913 | ||
6914 | /* Consume the `new' or `delete' token. */ | |
6915 | cp_lexer_consume_token (parser->lexer); | |
6916 | ||
6917 | /* Peek at the next token. */ | |
6918 | token = cp_lexer_peek_token (parser->lexer); | |
6919 | /* If it's a `[' token then this is the array variant of the | |
6920 | operator. */ | |
6921 | if (token->type == CPP_OPEN_SQUARE) | |
6922 | { | |
6923 | /* Consume the `[' token. */ | |
6924 | cp_lexer_consume_token (parser->lexer); | |
6925 | /* Look for the `]' token. */ | |
6926 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
6927 | id = ansi_opname (op == NEW_EXPR | |
6928 | ? VEC_NEW_EXPR : VEC_DELETE_EXPR); | |
6929 | } | |
6930 | /* Otherwise, we have the non-array variant. */ | |
6931 | else | |
6932 | id = ansi_opname (op); | |
6933 | ||
6934 | return id; | |
6935 | } | |
6936 | ||
6937 | case CPP_PLUS: | |
6938 | id = ansi_opname (PLUS_EXPR); | |
6939 | break; | |
6940 | ||
6941 | case CPP_MINUS: | |
6942 | id = ansi_opname (MINUS_EXPR); | |
6943 | break; | |
6944 | ||
6945 | case CPP_MULT: | |
6946 | id = ansi_opname (MULT_EXPR); | |
6947 | break; | |
6948 | ||
6949 | case CPP_DIV: | |
6950 | id = ansi_opname (TRUNC_DIV_EXPR); | |
6951 | break; | |
6952 | ||
6953 | case CPP_MOD: | |
6954 | id = ansi_opname (TRUNC_MOD_EXPR); | |
6955 | break; | |
6956 | ||
6957 | case CPP_XOR: | |
6958 | id = ansi_opname (BIT_XOR_EXPR); | |
6959 | break; | |
6960 | ||
6961 | case CPP_AND: | |
6962 | id = ansi_opname (BIT_AND_EXPR); | |
6963 | break; | |
6964 | ||
6965 | case CPP_OR: | |
6966 | id = ansi_opname (BIT_IOR_EXPR); | |
6967 | break; | |
6968 | ||
6969 | case CPP_COMPL: | |
6970 | id = ansi_opname (BIT_NOT_EXPR); | |
6971 | break; | |
6972 | ||
6973 | case CPP_NOT: | |
6974 | id = ansi_opname (TRUTH_NOT_EXPR); | |
6975 | break; | |
6976 | ||
6977 | case CPP_EQ: | |
6978 | id = ansi_assopname (NOP_EXPR); | |
6979 | break; | |
6980 | ||
6981 | case CPP_LESS: | |
6982 | id = ansi_opname (LT_EXPR); | |
6983 | break; | |
6984 | ||
6985 | case CPP_GREATER: | |
6986 | id = ansi_opname (GT_EXPR); | |
6987 | break; | |
6988 | ||
6989 | case CPP_PLUS_EQ: | |
6990 | id = ansi_assopname (PLUS_EXPR); | |
6991 | break; | |
6992 | ||
6993 | case CPP_MINUS_EQ: | |
6994 | id = ansi_assopname (MINUS_EXPR); | |
6995 | break; | |
6996 | ||
6997 | case CPP_MULT_EQ: | |
6998 | id = ansi_assopname (MULT_EXPR); | |
6999 | break; | |
7000 | ||
7001 | case CPP_DIV_EQ: | |
7002 | id = ansi_assopname (TRUNC_DIV_EXPR); | |
7003 | break; | |
7004 | ||
7005 | case CPP_MOD_EQ: | |
7006 | id = ansi_assopname (TRUNC_MOD_EXPR); | |
7007 | break; | |
7008 | ||
7009 | case CPP_XOR_EQ: | |
7010 | id = ansi_assopname (BIT_XOR_EXPR); | |
7011 | break; | |
7012 | ||
7013 | case CPP_AND_EQ: | |
7014 | id = ansi_assopname (BIT_AND_EXPR); | |
7015 | break; | |
7016 | ||
7017 | case CPP_OR_EQ: | |
7018 | id = ansi_assopname (BIT_IOR_EXPR); | |
7019 | break; | |
7020 | ||
7021 | case CPP_LSHIFT: | |
7022 | id = ansi_opname (LSHIFT_EXPR); | |
7023 | break; | |
7024 | ||
7025 | case CPP_RSHIFT: | |
7026 | id = ansi_opname (RSHIFT_EXPR); | |
7027 | break; | |
7028 | ||
7029 | case CPP_LSHIFT_EQ: | |
7030 | id = ansi_assopname (LSHIFT_EXPR); | |
7031 | break; | |
7032 | ||
7033 | case CPP_RSHIFT_EQ: | |
7034 | id = ansi_assopname (RSHIFT_EXPR); | |
7035 | break; | |
7036 | ||
7037 | case CPP_EQ_EQ: | |
7038 | id = ansi_opname (EQ_EXPR); | |
7039 | break; | |
7040 | ||
7041 | case CPP_NOT_EQ: | |
7042 | id = ansi_opname (NE_EXPR); | |
7043 | break; | |
7044 | ||
7045 | case CPP_LESS_EQ: | |
7046 | id = ansi_opname (LE_EXPR); | |
7047 | break; | |
7048 | ||
7049 | case CPP_GREATER_EQ: | |
7050 | id = ansi_opname (GE_EXPR); | |
7051 | break; | |
7052 | ||
7053 | case CPP_AND_AND: | |
7054 | id = ansi_opname (TRUTH_ANDIF_EXPR); | |
7055 | break; | |
7056 | ||
7057 | case CPP_OR_OR: | |
7058 | id = ansi_opname (TRUTH_ORIF_EXPR); | |
7059 | break; | |
7060 | ||
7061 | case CPP_PLUS_PLUS: | |
7062 | id = ansi_opname (POSTINCREMENT_EXPR); | |
7063 | break; | |
7064 | ||
7065 | case CPP_MINUS_MINUS: | |
7066 | id = ansi_opname (PREDECREMENT_EXPR); | |
7067 | break; | |
7068 | ||
7069 | case CPP_COMMA: | |
7070 | id = ansi_opname (COMPOUND_EXPR); | |
7071 | break; | |
7072 | ||
7073 | case CPP_DEREF_STAR: | |
7074 | id = ansi_opname (MEMBER_REF); | |
7075 | break; | |
7076 | ||
7077 | case CPP_DEREF: | |
7078 | id = ansi_opname (COMPONENT_REF); | |
7079 | break; | |
7080 | ||
7081 | case CPP_OPEN_PAREN: | |
7082 | /* Consume the `('. */ | |
7083 | cp_lexer_consume_token (parser->lexer); | |
7084 | /* Look for the matching `)'. */ | |
7085 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
7086 | return ansi_opname (CALL_EXPR); | |
7087 | ||
7088 | case CPP_OPEN_SQUARE: | |
7089 | /* Consume the `['. */ | |
7090 | cp_lexer_consume_token (parser->lexer); | |
7091 | /* Look for the matching `]'. */ | |
7092 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
7093 | return ansi_opname (ARRAY_REF); | |
7094 | ||
7095 | /* Extensions. */ | |
7096 | case CPP_MIN: | |
7097 | id = ansi_opname (MIN_EXPR); | |
7098 | break; | |
7099 | ||
7100 | case CPP_MAX: | |
7101 | id = ansi_opname (MAX_EXPR); | |
7102 | break; | |
7103 | ||
7104 | case CPP_MIN_EQ: | |
7105 | id = ansi_assopname (MIN_EXPR); | |
7106 | break; | |
7107 | ||
7108 | case CPP_MAX_EQ: | |
7109 | id = ansi_assopname (MAX_EXPR); | |
7110 | break; | |
7111 | ||
7112 | default: | |
7113 | /* Anything else is an error. */ | |
7114 | break; | |
7115 | } | |
7116 | ||
7117 | /* If we have selected an identifier, we need to consume the | |
7118 | operator token. */ | |
7119 | if (id) | |
7120 | cp_lexer_consume_token (parser->lexer); | |
7121 | /* Otherwise, no valid operator name was present. */ | |
7122 | else | |
7123 | { | |
7124 | cp_parser_error (parser, "expected operator"); | |
7125 | id = error_mark_node; | |
7126 | } | |
7127 | ||
7128 | return id; | |
7129 | } | |
7130 | ||
7131 | /* Parse a template-declaration. | |
7132 | ||
7133 | template-declaration: | |
7134 | export [opt] template < template-parameter-list > declaration | |
7135 | ||
7136 | If MEMBER_P is TRUE, this template-declaration occurs within a | |
7137 | class-specifier. | |
7138 | ||
7139 | The grammar rule given by the standard isn't correct. What | |
7140 | is really meant is: | |
7141 | ||
7142 | template-declaration: | |
7143 | export [opt] template-parameter-list-seq | |
7144 | decl-specifier-seq [opt] init-declarator [opt] ; | |
7145 | export [opt] template-parameter-list-seq | |
7146 | function-definition | |
7147 | ||
7148 | template-parameter-list-seq: | |
7149 | template-parameter-list-seq [opt] | |
7150 | template < template-parameter-list > */ | |
7151 | ||
7152 | static void | |
94edc4ab | 7153 | cp_parser_template_declaration (cp_parser* parser, bool member_p) |
a723baf1 MM |
7154 | { |
7155 | /* Check for `export'. */ | |
7156 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_EXPORT)) | |
7157 | { | |
7158 | /* Consume the `export' token. */ | |
7159 | cp_lexer_consume_token (parser->lexer); | |
7160 | /* Warn that we do not support `export'. */ | |
7161 | warning ("keyword `export' not implemented, and will be ignored"); | |
7162 | } | |
7163 | ||
7164 | cp_parser_template_declaration_after_export (parser, member_p); | |
7165 | } | |
7166 | ||
7167 | /* Parse a template-parameter-list. | |
7168 | ||
7169 | template-parameter-list: | |
7170 | template-parameter | |
7171 | template-parameter-list , template-parameter | |
7172 | ||
7173 | Returns a TREE_LIST. Each node represents a template parameter. | |
7174 | The nodes are connected via their TREE_CHAINs. */ | |
7175 | ||
7176 | static tree | |
94edc4ab | 7177 | cp_parser_template_parameter_list (cp_parser* parser) |
a723baf1 MM |
7178 | { |
7179 | tree parameter_list = NULL_TREE; | |
7180 | ||
7181 | while (true) | |
7182 | { | |
7183 | tree parameter; | |
7184 | cp_token *token; | |
7185 | ||
7186 | /* Parse the template-parameter. */ | |
7187 | parameter = cp_parser_template_parameter (parser); | |
7188 | /* Add it to the list. */ | |
7189 | parameter_list = process_template_parm (parameter_list, | |
7190 | parameter); | |
7191 | ||
7192 | /* Peek at the next token. */ | |
7193 | token = cp_lexer_peek_token (parser->lexer); | |
7194 | /* If it's not a `,', we're done. */ | |
7195 | if (token->type != CPP_COMMA) | |
7196 | break; | |
7197 | /* Otherwise, consume the `,' token. */ | |
7198 | cp_lexer_consume_token (parser->lexer); | |
7199 | } | |
7200 | ||
7201 | return parameter_list; | |
7202 | } | |
7203 | ||
7204 | /* Parse a template-parameter. | |
7205 | ||
7206 | template-parameter: | |
7207 | type-parameter | |
7208 | parameter-declaration | |
7209 | ||
7210 | Returns a TREE_LIST. The TREE_VALUE represents the parameter. The | |
7211 | TREE_PURPOSE is the default value, if any. */ | |
7212 | ||
7213 | static tree | |
94edc4ab | 7214 | cp_parser_template_parameter (cp_parser* parser) |
a723baf1 MM |
7215 | { |
7216 | cp_token *token; | |
7217 | ||
7218 | /* Peek at the next token. */ | |
7219 | token = cp_lexer_peek_token (parser->lexer); | |
7220 | /* If it is `class' or `template', we have a type-parameter. */ | |
7221 | if (token->keyword == RID_TEMPLATE) | |
7222 | return cp_parser_type_parameter (parser); | |
7223 | /* If it is `class' or `typename' we do not know yet whether it is a | |
7224 | type parameter or a non-type parameter. Consider: | |
7225 | ||
7226 | template <typename T, typename T::X X> ... | |
7227 | ||
7228 | or: | |
7229 | ||
7230 | template <class C, class D*> ... | |
7231 | ||
7232 | Here, the first parameter is a type parameter, and the second is | |
7233 | a non-type parameter. We can tell by looking at the token after | |
7234 | the identifier -- if it is a `,', `=', or `>' then we have a type | |
7235 | parameter. */ | |
7236 | if (token->keyword == RID_TYPENAME || token->keyword == RID_CLASS) | |
7237 | { | |
7238 | /* Peek at the token after `class' or `typename'. */ | |
7239 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
7240 | /* If it's an identifier, skip it. */ | |
7241 | if (token->type == CPP_NAME) | |
7242 | token = cp_lexer_peek_nth_token (parser->lexer, 3); | |
7243 | /* Now, see if the token looks like the end of a template | |
7244 | parameter. */ | |
7245 | if (token->type == CPP_COMMA | |
7246 | || token->type == CPP_EQ | |
7247 | || token->type == CPP_GREATER) | |
7248 | return cp_parser_type_parameter (parser); | |
7249 | } | |
7250 | ||
7251 | /* Otherwise, it is a non-type parameter. | |
7252 | ||
7253 | [temp.param] | |
7254 | ||
7255 | When parsing a default template-argument for a non-type | |
7256 | template-parameter, the first non-nested `>' is taken as the end | |
7257 | of the template parameter-list rather than a greater-than | |
7258 | operator. */ | |
7259 | return | |
ec194454 | 7260 | cp_parser_parameter_declaration (parser, /*template_parm_p=*/true); |
a723baf1 MM |
7261 | } |
7262 | ||
7263 | /* Parse a type-parameter. | |
7264 | ||
7265 | type-parameter: | |
7266 | class identifier [opt] | |
7267 | class identifier [opt] = type-id | |
7268 | typename identifier [opt] | |
7269 | typename identifier [opt] = type-id | |
7270 | template < template-parameter-list > class identifier [opt] | |
7271 | template < template-parameter-list > class identifier [opt] | |
7272 | = id-expression | |
7273 | ||
7274 | Returns a TREE_LIST. The TREE_VALUE is itself a TREE_LIST. The | |
7275 | TREE_PURPOSE is the default-argument, if any. The TREE_VALUE is | |
7276 | the declaration of the parameter. */ | |
7277 | ||
7278 | static tree | |
94edc4ab | 7279 | cp_parser_type_parameter (cp_parser* parser) |
a723baf1 MM |
7280 | { |
7281 | cp_token *token; | |
7282 | tree parameter; | |
7283 | ||
7284 | /* Look for a keyword to tell us what kind of parameter this is. */ | |
7285 | token = cp_parser_require (parser, CPP_KEYWORD, | |
8a6393df | 7286 | "`class', `typename', or `template'"); |
a723baf1 MM |
7287 | if (!token) |
7288 | return error_mark_node; | |
7289 | ||
7290 | switch (token->keyword) | |
7291 | { | |
7292 | case RID_CLASS: | |
7293 | case RID_TYPENAME: | |
7294 | { | |
7295 | tree identifier; | |
7296 | tree default_argument; | |
7297 | ||
7298 | /* If the next token is an identifier, then it names the | |
7299 | parameter. */ | |
7300 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME)) | |
7301 | identifier = cp_parser_identifier (parser); | |
7302 | else | |
7303 | identifier = NULL_TREE; | |
7304 | ||
7305 | /* Create the parameter. */ | |
7306 | parameter = finish_template_type_parm (class_type_node, identifier); | |
7307 | ||
7308 | /* If the next token is an `=', we have a default argument. */ | |
7309 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
7310 | { | |
7311 | /* Consume the `=' token. */ | |
7312 | cp_lexer_consume_token (parser->lexer); | |
34cd5ae7 | 7313 | /* Parse the default-argument. */ |
a723baf1 MM |
7314 | default_argument = cp_parser_type_id (parser); |
7315 | } | |
7316 | else | |
7317 | default_argument = NULL_TREE; | |
7318 | ||
7319 | /* Create the combined representation of the parameter and the | |
7320 | default argument. */ | |
7321 | parameter = build_tree_list (default_argument, | |
7322 | parameter); | |
7323 | } | |
7324 | break; | |
7325 | ||
7326 | case RID_TEMPLATE: | |
7327 | { | |
7328 | tree parameter_list; | |
7329 | tree identifier; | |
7330 | tree default_argument; | |
7331 | ||
7332 | /* Look for the `<'. */ | |
7333 | cp_parser_require (parser, CPP_LESS, "`<'"); | |
7334 | /* Parse the template-parameter-list. */ | |
7335 | begin_template_parm_list (); | |
7336 | parameter_list | |
7337 | = cp_parser_template_parameter_list (parser); | |
7338 | parameter_list = end_template_parm_list (parameter_list); | |
7339 | /* Look for the `>'. */ | |
7340 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
7341 | /* Look for the `class' keyword. */ | |
7342 | cp_parser_require_keyword (parser, RID_CLASS, "`class'"); | |
7343 | /* If the next token is an `=', then there is a | |
7344 | default-argument. If the next token is a `>', we are at | |
7345 | the end of the parameter-list. If the next token is a `,', | |
7346 | then we are at the end of this parameter. */ | |
7347 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_EQ) | |
7348 | && cp_lexer_next_token_is_not (parser->lexer, CPP_GREATER) | |
7349 | && cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
7350 | identifier = cp_parser_identifier (parser); | |
7351 | else | |
7352 | identifier = NULL_TREE; | |
7353 | /* Create the template parameter. */ | |
7354 | parameter = finish_template_template_parm (class_type_node, | |
7355 | identifier); | |
7356 | ||
7357 | /* If the next token is an `=', then there is a | |
7358 | default-argument. */ | |
7359 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
7360 | { | |
7361 | /* Consume the `='. */ | |
7362 | cp_lexer_consume_token (parser->lexer); | |
7363 | /* Parse the id-expression. */ | |
7364 | default_argument | |
7365 | = cp_parser_id_expression (parser, | |
7366 | /*template_keyword_p=*/false, | |
7367 | /*check_dependency_p=*/true, | |
7368 | /*template_p=*/NULL); | |
7369 | /* Look up the name. */ | |
7370 | default_argument | |
7371 | = cp_parser_lookup_name_simple (parser, default_argument); | |
7372 | /* See if the default argument is valid. */ | |
7373 | default_argument | |
7374 | = check_template_template_default_arg (default_argument); | |
7375 | } | |
7376 | else | |
7377 | default_argument = NULL_TREE; | |
7378 | ||
7379 | /* Create the combined representation of the parameter and the | |
7380 | default argument. */ | |
7381 | parameter = build_tree_list (default_argument, | |
7382 | parameter); | |
7383 | } | |
7384 | break; | |
7385 | ||
7386 | default: | |
7387 | /* Anything else is an error. */ | |
7388 | cp_parser_error (parser, | |
7389 | "expected `class', `typename', or `template'"); | |
7390 | parameter = error_mark_node; | |
7391 | } | |
7392 | ||
7393 | return parameter; | |
7394 | } | |
7395 | ||
7396 | /* Parse a template-id. | |
7397 | ||
7398 | template-id: | |
7399 | template-name < template-argument-list [opt] > | |
7400 | ||
7401 | If TEMPLATE_KEYWORD_P is TRUE, then we have just seen the | |
7402 | `template' keyword. In this case, a TEMPLATE_ID_EXPR will be | |
7403 | returned. Otherwise, if the template-name names a function, or set | |
7404 | of functions, returns a TEMPLATE_ID_EXPR. If the template-name | |
7405 | names a class, returns a TYPE_DECL for the specialization. | |
7406 | ||
7407 | If CHECK_DEPENDENCY_P is FALSE, names are looked up in | |
7408 | uninstantiated templates. */ | |
7409 | ||
7410 | static tree | |
7411 | cp_parser_template_id (cp_parser *parser, | |
7412 | bool template_keyword_p, | |
7413 | bool check_dependency_p) | |
7414 | { | |
7415 | tree template; | |
7416 | tree arguments; | |
7417 | tree saved_scope; | |
7418 | tree saved_qualifying_scope; | |
7419 | tree saved_object_scope; | |
7420 | tree template_id; | |
7421 | bool saved_greater_than_is_operator_p; | |
7422 | ptrdiff_t start_of_id; | |
7423 | tree access_check = NULL_TREE; | |
2050a1bb | 7424 | cp_token *next_token; |
a723baf1 MM |
7425 | |
7426 | /* If the next token corresponds to a template-id, there is no need | |
7427 | to reparse it. */ | |
2050a1bb MM |
7428 | next_token = cp_lexer_peek_token (parser->lexer); |
7429 | if (next_token->type == CPP_TEMPLATE_ID) | |
a723baf1 MM |
7430 | { |
7431 | tree value; | |
7432 | tree check; | |
7433 | ||
7434 | /* Get the stored value. */ | |
7435 | value = cp_lexer_consume_token (parser->lexer)->value; | |
7436 | /* Perform any access checks that were deferred. */ | |
7437 | for (check = TREE_PURPOSE (value); check; check = TREE_CHAIN (check)) | |
cf22909c KL |
7438 | perform_or_defer_access_check (TREE_PURPOSE (check), |
7439 | TREE_VALUE (check)); | |
a723baf1 MM |
7440 | /* Return the stored value. */ |
7441 | return TREE_VALUE (value); | |
7442 | } | |
7443 | ||
2050a1bb MM |
7444 | /* Avoid performing name lookup if there is no possibility of |
7445 | finding a template-id. */ | |
7446 | if ((next_token->type != CPP_NAME && next_token->keyword != RID_OPERATOR) | |
7447 | || (next_token->type == CPP_NAME | |
7448 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type != CPP_LESS)) | |
7449 | { | |
7450 | cp_parser_error (parser, "expected template-id"); | |
7451 | return error_mark_node; | |
7452 | } | |
7453 | ||
a723baf1 MM |
7454 | /* Remember where the template-id starts. */ |
7455 | if (cp_parser_parsing_tentatively (parser) | |
7456 | && !cp_parser_committed_to_tentative_parse (parser)) | |
7457 | { | |
2050a1bb | 7458 | next_token = cp_lexer_peek_token (parser->lexer); |
a723baf1 MM |
7459 | start_of_id = cp_lexer_token_difference (parser->lexer, |
7460 | parser->lexer->first_token, | |
7461 | next_token); | |
a723baf1 MM |
7462 | } |
7463 | else | |
7464 | start_of_id = -1; | |
7465 | ||
8d241e0b | 7466 | push_deferring_access_checks (dk_deferred); |
cf22909c | 7467 | |
a723baf1 MM |
7468 | /* Parse the template-name. */ |
7469 | template = cp_parser_template_name (parser, template_keyword_p, | |
7470 | check_dependency_p); | |
7471 | if (template == error_mark_node) | |
cf22909c KL |
7472 | { |
7473 | pop_deferring_access_checks (); | |
7474 | return error_mark_node; | |
7475 | } | |
a723baf1 MM |
7476 | |
7477 | /* Look for the `<' that starts the template-argument-list. */ | |
7478 | if (!cp_parser_require (parser, CPP_LESS, "`<'")) | |
cf22909c KL |
7479 | { |
7480 | pop_deferring_access_checks (); | |
7481 | return error_mark_node; | |
7482 | } | |
a723baf1 MM |
7483 | |
7484 | /* [temp.names] | |
7485 | ||
7486 | When parsing a template-id, the first non-nested `>' is taken as | |
7487 | the end of the template-argument-list rather than a greater-than | |
7488 | operator. */ | |
7489 | saved_greater_than_is_operator_p | |
7490 | = parser->greater_than_is_operator_p; | |
7491 | parser->greater_than_is_operator_p = false; | |
7492 | /* Parsing the argument list may modify SCOPE, so we save it | |
7493 | here. */ | |
7494 | saved_scope = parser->scope; | |
7495 | saved_qualifying_scope = parser->qualifying_scope; | |
7496 | saved_object_scope = parser->object_scope; | |
7497 | /* Parse the template-argument-list itself. */ | |
7498 | if (cp_lexer_next_token_is (parser->lexer, CPP_GREATER)) | |
7499 | arguments = NULL_TREE; | |
7500 | else | |
7501 | arguments = cp_parser_template_argument_list (parser); | |
7502 | /* Look for the `>' that ends the template-argument-list. */ | |
7503 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
7504 | /* The `>' token might be a greater-than operator again now. */ | |
7505 | parser->greater_than_is_operator_p | |
7506 | = saved_greater_than_is_operator_p; | |
7507 | /* Restore the SAVED_SCOPE. */ | |
7508 | parser->scope = saved_scope; | |
7509 | parser->qualifying_scope = saved_qualifying_scope; | |
7510 | parser->object_scope = saved_object_scope; | |
7511 | ||
7512 | /* Build a representation of the specialization. */ | |
7513 | if (TREE_CODE (template) == IDENTIFIER_NODE) | |
7514 | template_id = build_min_nt (TEMPLATE_ID_EXPR, template, arguments); | |
7515 | else if (DECL_CLASS_TEMPLATE_P (template) | |
7516 | || DECL_TEMPLATE_TEMPLATE_PARM_P (template)) | |
7517 | template_id | |
7518 | = finish_template_type (template, arguments, | |
7519 | cp_lexer_next_token_is (parser->lexer, | |
7520 | CPP_SCOPE)); | |
7521 | else | |
7522 | { | |
7523 | /* If it's not a class-template or a template-template, it should be | |
7524 | a function-template. */ | |
7525 | my_friendly_assert ((DECL_FUNCTION_TEMPLATE_P (template) | |
7526 | || TREE_CODE (template) == OVERLOAD | |
7527 | || BASELINK_P (template)), | |
7528 | 20010716); | |
7529 | ||
7530 | template_id = lookup_template_function (template, arguments); | |
7531 | } | |
7532 | ||
cf22909c KL |
7533 | /* Retrieve any deferred checks. Do not pop this access checks yet |
7534 | so the memory will not be reclaimed during token replacing below. */ | |
7535 | access_check = get_deferred_access_checks (); | |
7536 | ||
a723baf1 MM |
7537 | /* If parsing tentatively, replace the sequence of tokens that makes |
7538 | up the template-id with a CPP_TEMPLATE_ID token. That way, | |
7539 | should we re-parse the token stream, we will not have to repeat | |
7540 | the effort required to do the parse, nor will we issue duplicate | |
7541 | error messages about problems during instantiation of the | |
7542 | template. */ | |
7543 | if (start_of_id >= 0) | |
7544 | { | |
7545 | cp_token *token; | |
a723baf1 MM |
7546 | |
7547 | /* Find the token that corresponds to the start of the | |
7548 | template-id. */ | |
7549 | token = cp_lexer_advance_token (parser->lexer, | |
7550 | parser->lexer->first_token, | |
7551 | start_of_id); | |
7552 | ||
a723baf1 MM |
7553 | /* Reset the contents of the START_OF_ID token. */ |
7554 | token->type = CPP_TEMPLATE_ID; | |
7555 | token->value = build_tree_list (access_check, template_id); | |
7556 | token->keyword = RID_MAX; | |
7557 | /* Purge all subsequent tokens. */ | |
7558 | cp_lexer_purge_tokens_after (parser->lexer, token); | |
7559 | } | |
7560 | ||
cf22909c | 7561 | pop_deferring_access_checks (); |
a723baf1 MM |
7562 | return template_id; |
7563 | } | |
7564 | ||
7565 | /* Parse a template-name. | |
7566 | ||
7567 | template-name: | |
7568 | identifier | |
7569 | ||
7570 | The standard should actually say: | |
7571 | ||
7572 | template-name: | |
7573 | identifier | |
7574 | operator-function-id | |
7575 | conversion-function-id | |
7576 | ||
7577 | A defect report has been filed about this issue. | |
7578 | ||
7579 | If TEMPLATE_KEYWORD_P is true, then we have just seen the | |
7580 | `template' keyword, in a construction like: | |
7581 | ||
7582 | T::template f<3>() | |
7583 | ||
7584 | In that case `f' is taken to be a template-name, even though there | |
7585 | is no way of knowing for sure. | |
7586 | ||
7587 | Returns the TEMPLATE_DECL for the template, or an OVERLOAD if the | |
7588 | name refers to a set of overloaded functions, at least one of which | |
7589 | is a template, or an IDENTIFIER_NODE with the name of the template, | |
7590 | if TEMPLATE_KEYWORD_P is true. If CHECK_DEPENDENCY_P is FALSE, | |
7591 | names are looked up inside uninstantiated templates. */ | |
7592 | ||
7593 | static tree | |
94edc4ab NN |
7594 | cp_parser_template_name (cp_parser* parser, |
7595 | bool template_keyword_p, | |
7596 | bool check_dependency_p) | |
a723baf1 MM |
7597 | { |
7598 | tree identifier; | |
7599 | tree decl; | |
7600 | tree fns; | |
7601 | ||
7602 | /* If the next token is `operator', then we have either an | |
7603 | operator-function-id or a conversion-function-id. */ | |
7604 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_OPERATOR)) | |
7605 | { | |
7606 | /* We don't know whether we're looking at an | |
7607 | operator-function-id or a conversion-function-id. */ | |
7608 | cp_parser_parse_tentatively (parser); | |
7609 | /* Try an operator-function-id. */ | |
7610 | identifier = cp_parser_operator_function_id (parser); | |
7611 | /* If that didn't work, try a conversion-function-id. */ | |
7612 | if (!cp_parser_parse_definitely (parser)) | |
7613 | identifier = cp_parser_conversion_function_id (parser); | |
7614 | } | |
7615 | /* Look for the identifier. */ | |
7616 | else | |
7617 | identifier = cp_parser_identifier (parser); | |
7618 | ||
7619 | /* If we didn't find an identifier, we don't have a template-id. */ | |
7620 | if (identifier == error_mark_node) | |
7621 | return error_mark_node; | |
7622 | ||
7623 | /* If the name immediately followed the `template' keyword, then it | |
7624 | is a template-name. However, if the next token is not `<', then | |
7625 | we do not treat it as a template-name, since it is not being used | |
7626 | as part of a template-id. This enables us to handle constructs | |
7627 | like: | |
7628 | ||
7629 | template <typename T> struct S { S(); }; | |
7630 | template <typename T> S<T>::S(); | |
7631 | ||
7632 | correctly. We would treat `S' as a template -- if it were `S<T>' | |
7633 | -- but we do not if there is no `<'. */ | |
7634 | if (template_keyword_p && processing_template_decl | |
7635 | && cp_lexer_next_token_is (parser->lexer, CPP_LESS)) | |
7636 | return identifier; | |
7637 | ||
7638 | /* Look up the name. */ | |
7639 | decl = cp_parser_lookup_name (parser, identifier, | |
a723baf1 | 7640 | /*is_type=*/false, |
eea9800f | 7641 | /*is_namespace=*/false, |
a723baf1 MM |
7642 | check_dependency_p); |
7643 | decl = maybe_get_template_decl_from_type_decl (decl); | |
7644 | ||
7645 | /* If DECL is a template, then the name was a template-name. */ | |
7646 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
7647 | ; | |
7648 | else | |
7649 | { | |
7650 | /* The standard does not explicitly indicate whether a name that | |
7651 | names a set of overloaded declarations, some of which are | |
7652 | templates, is a template-name. However, such a name should | |
7653 | be a template-name; otherwise, there is no way to form a | |
7654 | template-id for the overloaded templates. */ | |
7655 | fns = BASELINK_P (decl) ? BASELINK_FUNCTIONS (decl) : decl; | |
7656 | if (TREE_CODE (fns) == OVERLOAD) | |
7657 | { | |
7658 | tree fn; | |
7659 | ||
7660 | for (fn = fns; fn; fn = OVL_NEXT (fn)) | |
7661 | if (TREE_CODE (OVL_CURRENT (fn)) == TEMPLATE_DECL) | |
7662 | break; | |
7663 | } | |
7664 | else | |
7665 | { | |
7666 | /* Otherwise, the name does not name a template. */ | |
7667 | cp_parser_error (parser, "expected template-name"); | |
7668 | return error_mark_node; | |
7669 | } | |
7670 | } | |
7671 | ||
7672 | /* If DECL is dependent, and refers to a function, then just return | |
7673 | its name; we will look it up again during template instantiation. */ | |
7674 | if (DECL_FUNCTION_TEMPLATE_P (decl) || !DECL_P (decl)) | |
7675 | { | |
7676 | tree scope = CP_DECL_CONTEXT (get_first_fn (decl)); | |
1fb3244a | 7677 | if (TYPE_P (scope) && dependent_type_p (scope)) |
a723baf1 MM |
7678 | return identifier; |
7679 | } | |
7680 | ||
7681 | return decl; | |
7682 | } | |
7683 | ||
7684 | /* Parse a template-argument-list. | |
7685 | ||
7686 | template-argument-list: | |
7687 | template-argument | |
7688 | template-argument-list , template-argument | |
7689 | ||
7690 | Returns a TREE_LIST representing the arguments, in the order they | |
7691 | appeared. The TREE_VALUE of each node is a representation of the | |
7692 | argument. */ | |
7693 | ||
7694 | static tree | |
94edc4ab | 7695 | cp_parser_template_argument_list (cp_parser* parser) |
a723baf1 MM |
7696 | { |
7697 | tree arguments = NULL_TREE; | |
7698 | ||
7699 | while (true) | |
7700 | { | |
7701 | tree argument; | |
7702 | ||
7703 | /* Parse the template-argument. */ | |
7704 | argument = cp_parser_template_argument (parser); | |
7705 | /* Add it to the list. */ | |
7706 | arguments = tree_cons (NULL_TREE, argument, arguments); | |
7707 | /* If it is not a `,', then there are no more arguments. */ | |
7708 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
7709 | break; | |
7710 | /* Otherwise, consume the ','. */ | |
7711 | cp_lexer_consume_token (parser->lexer); | |
7712 | } | |
7713 | ||
7714 | /* We built up the arguments in reverse order. */ | |
7715 | return nreverse (arguments); | |
7716 | } | |
7717 | ||
7718 | /* Parse a template-argument. | |
7719 | ||
7720 | template-argument: | |
7721 | assignment-expression | |
7722 | type-id | |
7723 | id-expression | |
7724 | ||
7725 | The representation is that of an assignment-expression, type-id, or | |
7726 | id-expression -- except that the qualified id-expression is | |
7727 | evaluated, so that the value returned is either a DECL or an | |
d17811fd MM |
7728 | OVERLOAD. |
7729 | ||
7730 | Although the standard says "assignment-expression", it forbids | |
7731 | throw-expressions or assignments in the template argument. | |
7732 | Therefore, we use "conditional-expression" instead. */ | |
a723baf1 MM |
7733 | |
7734 | static tree | |
94edc4ab | 7735 | cp_parser_template_argument (cp_parser* parser) |
a723baf1 MM |
7736 | { |
7737 | tree argument; | |
7738 | bool template_p; | |
d17811fd MM |
7739 | bool address_p; |
7740 | cp_token *token; | |
b3445994 | 7741 | cp_id_kind idk; |
d17811fd | 7742 | tree qualifying_class; |
a723baf1 MM |
7743 | |
7744 | /* There's really no way to know what we're looking at, so we just | |
7745 | try each alternative in order. | |
7746 | ||
7747 | [temp.arg] | |
7748 | ||
7749 | In a template-argument, an ambiguity between a type-id and an | |
7750 | expression is resolved to a type-id, regardless of the form of | |
7751 | the corresponding template-parameter. | |
7752 | ||
7753 | Therefore, we try a type-id first. */ | |
7754 | cp_parser_parse_tentatively (parser); | |
a723baf1 MM |
7755 | argument = cp_parser_type_id (parser); |
7756 | /* If the next token isn't a `,' or a `>', then this argument wasn't | |
7757 | really finished. */ | |
d17811fd | 7758 | if (!cp_parser_next_token_ends_template_argument_p (parser)) |
a723baf1 MM |
7759 | cp_parser_error (parser, "expected template-argument"); |
7760 | /* If that worked, we're done. */ | |
7761 | if (cp_parser_parse_definitely (parser)) | |
7762 | return argument; | |
7763 | /* We're still not sure what the argument will be. */ | |
7764 | cp_parser_parse_tentatively (parser); | |
7765 | /* Try a template. */ | |
7766 | argument = cp_parser_id_expression (parser, | |
7767 | /*template_keyword_p=*/false, | |
7768 | /*check_dependency_p=*/true, | |
7769 | &template_p); | |
7770 | /* If the next token isn't a `,' or a `>', then this argument wasn't | |
7771 | really finished. */ | |
d17811fd | 7772 | if (!cp_parser_next_token_ends_template_argument_p (parser)) |
a723baf1 MM |
7773 | cp_parser_error (parser, "expected template-argument"); |
7774 | if (!cp_parser_error_occurred (parser)) | |
7775 | { | |
7776 | /* Figure out what is being referred to. */ | |
7777 | argument = cp_parser_lookup_name_simple (parser, argument); | |
7778 | if (template_p) | |
7779 | argument = make_unbound_class_template (TREE_OPERAND (argument, 0), | |
7780 | TREE_OPERAND (argument, 1), | |
78757caa | 7781 | tf_error); |
a723baf1 MM |
7782 | else if (TREE_CODE (argument) != TEMPLATE_DECL) |
7783 | cp_parser_error (parser, "expected template-name"); | |
7784 | } | |
7785 | if (cp_parser_parse_definitely (parser)) | |
7786 | return argument; | |
d17811fd MM |
7787 | /* It must be a non-type argument. There permitted cases are given |
7788 | in [temp.arg.nontype]: | |
7789 | ||
7790 | -- an integral constant-expression of integral or enumeration | |
7791 | type; or | |
7792 | ||
7793 | -- the name of a non-type template-parameter; or | |
7794 | ||
7795 | -- the name of an object or function with external linkage... | |
7796 | ||
7797 | -- the address of an object or function with external linkage... | |
7798 | ||
7799 | -- a pointer to member... */ | |
7800 | /* Look for a non-type template parameter. */ | |
7801 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME)) | |
7802 | { | |
7803 | cp_parser_parse_tentatively (parser); | |
7804 | argument = cp_parser_primary_expression (parser, | |
7805 | &idk, | |
7806 | &qualifying_class); | |
7807 | if (TREE_CODE (argument) != TEMPLATE_PARM_INDEX | |
7808 | || !cp_parser_next_token_ends_template_argument_p (parser)) | |
7809 | cp_parser_simulate_error (parser); | |
7810 | if (cp_parser_parse_definitely (parser)) | |
7811 | return argument; | |
7812 | } | |
7813 | /* If the next token is "&", the argument must be the address of an | |
7814 | object or function with external linkage. */ | |
7815 | address_p = cp_lexer_next_token_is (parser->lexer, CPP_AND); | |
7816 | if (address_p) | |
7817 | cp_lexer_consume_token (parser->lexer); | |
7818 | /* See if we might have an id-expression. */ | |
7819 | token = cp_lexer_peek_token (parser->lexer); | |
7820 | if (token->type == CPP_NAME | |
7821 | || token->keyword == RID_OPERATOR | |
7822 | || token->type == CPP_SCOPE | |
7823 | || token->type == CPP_TEMPLATE_ID | |
7824 | || token->type == CPP_NESTED_NAME_SPECIFIER) | |
7825 | { | |
7826 | cp_parser_parse_tentatively (parser); | |
7827 | argument = cp_parser_primary_expression (parser, | |
7828 | &idk, | |
7829 | &qualifying_class); | |
7830 | if (cp_parser_error_occurred (parser) | |
7831 | || !cp_parser_next_token_ends_template_argument_p (parser)) | |
7832 | cp_parser_abort_tentative_parse (parser); | |
7833 | else | |
7834 | { | |
7835 | if (qualifying_class) | |
7836 | argument = finish_qualified_id_expr (qualifying_class, | |
7837 | argument, | |
7838 | /*done=*/true, | |
7839 | address_p); | |
7840 | if (TREE_CODE (argument) == VAR_DECL) | |
7841 | { | |
7842 | /* A variable without external linkage might still be a | |
7843 | valid constant-expression, so no error is issued here | |
7844 | if the external-linkage check fails. */ | |
7845 | if (!DECL_EXTERNAL_LINKAGE_P (argument)) | |
7846 | cp_parser_simulate_error (parser); | |
7847 | } | |
7848 | else if (is_overloaded_fn (argument)) | |
7849 | /* All overloaded functions are allowed; if the external | |
7850 | linkage test does not pass, an error will be issued | |
7851 | later. */ | |
7852 | ; | |
7853 | else if (address_p | |
7854 | && (TREE_CODE (argument) == OFFSET_REF | |
7855 | || TREE_CODE (argument) == SCOPE_REF)) | |
7856 | /* A pointer-to-member. */ | |
7857 | ; | |
7858 | else | |
7859 | cp_parser_simulate_error (parser); | |
7860 | ||
7861 | if (cp_parser_parse_definitely (parser)) | |
7862 | { | |
7863 | if (address_p) | |
7864 | argument = build_x_unary_op (ADDR_EXPR, argument); | |
7865 | return argument; | |
7866 | } | |
7867 | } | |
7868 | } | |
7869 | /* If the argument started with "&", there are no other valid | |
7870 | alternatives at this point. */ | |
7871 | if (address_p) | |
7872 | { | |
7873 | cp_parser_error (parser, "invalid non-type template argument"); | |
7874 | return error_mark_node; | |
7875 | } | |
7876 | /* The argument must be a constant-expression. */ | |
7877 | argument = cp_parser_constant_expression (parser, | |
7878 | /*allow_non_constant_p=*/false, | |
7879 | /*non_constant_p=*/NULL); | |
7880 | /* If it's non-dependent, simplify it. */ | |
7881 | return cp_parser_fold_non_dependent_expr (argument); | |
a723baf1 MM |
7882 | } |
7883 | ||
7884 | /* Parse an explicit-instantiation. | |
7885 | ||
7886 | explicit-instantiation: | |
7887 | template declaration | |
7888 | ||
7889 | Although the standard says `declaration', what it really means is: | |
7890 | ||
7891 | explicit-instantiation: | |
7892 | template decl-specifier-seq [opt] declarator [opt] ; | |
7893 | ||
7894 | Things like `template int S<int>::i = 5, int S<double>::j;' are not | |
7895 | supposed to be allowed. A defect report has been filed about this | |
7896 | issue. | |
7897 | ||
7898 | GNU Extension: | |
7899 | ||
7900 | explicit-instantiation: | |
7901 | storage-class-specifier template | |
7902 | decl-specifier-seq [opt] declarator [opt] ; | |
7903 | function-specifier template | |
7904 | decl-specifier-seq [opt] declarator [opt] ; */ | |
7905 | ||
7906 | static void | |
94edc4ab | 7907 | cp_parser_explicit_instantiation (cp_parser* parser) |
a723baf1 MM |
7908 | { |
7909 | bool declares_class_or_enum; | |
7910 | tree decl_specifiers; | |
7911 | tree attributes; | |
7912 | tree extension_specifier = NULL_TREE; | |
7913 | ||
7914 | /* Look for an (optional) storage-class-specifier or | |
7915 | function-specifier. */ | |
7916 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
7917 | { | |
7918 | extension_specifier | |
7919 | = cp_parser_storage_class_specifier_opt (parser); | |
7920 | if (!extension_specifier) | |
7921 | extension_specifier = cp_parser_function_specifier_opt (parser); | |
7922 | } | |
7923 | ||
7924 | /* Look for the `template' keyword. */ | |
7925 | cp_parser_require_keyword (parser, RID_TEMPLATE, "`template'"); | |
7926 | /* Let the front end know that we are processing an explicit | |
7927 | instantiation. */ | |
7928 | begin_explicit_instantiation (); | |
7929 | /* [temp.explicit] says that we are supposed to ignore access | |
7930 | control while processing explicit instantiation directives. */ | |
78757caa | 7931 | push_deferring_access_checks (dk_no_check); |
a723baf1 MM |
7932 | /* Parse a decl-specifier-seq. */ |
7933 | decl_specifiers | |
7934 | = cp_parser_decl_specifier_seq (parser, | |
7935 | CP_PARSER_FLAGS_OPTIONAL, | |
7936 | &attributes, | |
7937 | &declares_class_or_enum); | |
7938 | /* If there was exactly one decl-specifier, and it declared a class, | |
7939 | and there's no declarator, then we have an explicit type | |
7940 | instantiation. */ | |
7941 | if (declares_class_or_enum && cp_parser_declares_only_class_p (parser)) | |
7942 | { | |
7943 | tree type; | |
7944 | ||
7945 | type = check_tag_decl (decl_specifiers); | |
b7fc8b57 KL |
7946 | /* Turn access control back on for names used during |
7947 | template instantiation. */ | |
7948 | pop_deferring_access_checks (); | |
a723baf1 MM |
7949 | if (type) |
7950 | do_type_instantiation (type, extension_specifier, /*complain=*/1); | |
7951 | } | |
7952 | else | |
7953 | { | |
7954 | tree declarator; | |
7955 | tree decl; | |
7956 | ||
7957 | /* Parse the declarator. */ | |
7958 | declarator | |
62b8a44e | 7959 | = cp_parser_declarator (parser, CP_PARSER_DECLARATOR_NAMED, |
a723baf1 MM |
7960 | /*ctor_dtor_or_conv_p=*/NULL); |
7961 | decl = grokdeclarator (declarator, decl_specifiers, | |
7962 | NORMAL, 0, NULL); | |
b7fc8b57 KL |
7963 | /* Turn access control back on for names used during |
7964 | template instantiation. */ | |
7965 | pop_deferring_access_checks (); | |
a723baf1 MM |
7966 | /* Do the explicit instantiation. */ |
7967 | do_decl_instantiation (decl, extension_specifier); | |
7968 | } | |
7969 | /* We're done with the instantiation. */ | |
7970 | end_explicit_instantiation (); | |
a723baf1 | 7971 | |
e0860732 | 7972 | cp_parser_consume_semicolon_at_end_of_statement (parser); |
a723baf1 MM |
7973 | } |
7974 | ||
7975 | /* Parse an explicit-specialization. | |
7976 | ||
7977 | explicit-specialization: | |
7978 | template < > declaration | |
7979 | ||
7980 | Although the standard says `declaration', what it really means is: | |
7981 | ||
7982 | explicit-specialization: | |
7983 | template <> decl-specifier [opt] init-declarator [opt] ; | |
7984 | template <> function-definition | |
7985 | template <> explicit-specialization | |
7986 | template <> template-declaration */ | |
7987 | ||
7988 | static void | |
94edc4ab | 7989 | cp_parser_explicit_specialization (cp_parser* parser) |
a723baf1 MM |
7990 | { |
7991 | /* Look for the `template' keyword. */ | |
7992 | cp_parser_require_keyword (parser, RID_TEMPLATE, "`template'"); | |
7993 | /* Look for the `<'. */ | |
7994 | cp_parser_require (parser, CPP_LESS, "`<'"); | |
7995 | /* Look for the `>'. */ | |
7996 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
7997 | /* We have processed another parameter list. */ | |
7998 | ++parser->num_template_parameter_lists; | |
7999 | /* Let the front end know that we are beginning a specialization. */ | |
8000 | begin_specialization (); | |
8001 | ||
8002 | /* If the next keyword is `template', we need to figure out whether | |
8003 | or not we're looking a template-declaration. */ | |
8004 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
8005 | { | |
8006 | if (cp_lexer_peek_nth_token (parser->lexer, 2)->type == CPP_LESS | |
8007 | && cp_lexer_peek_nth_token (parser->lexer, 3)->type != CPP_GREATER) | |
8008 | cp_parser_template_declaration_after_export (parser, | |
8009 | /*member_p=*/false); | |
8010 | else | |
8011 | cp_parser_explicit_specialization (parser); | |
8012 | } | |
8013 | else | |
8014 | /* Parse the dependent declaration. */ | |
8015 | cp_parser_single_declaration (parser, | |
8016 | /*member_p=*/false, | |
8017 | /*friend_p=*/NULL); | |
8018 | ||
8019 | /* We're done with the specialization. */ | |
8020 | end_specialization (); | |
8021 | /* We're done with this parameter list. */ | |
8022 | --parser->num_template_parameter_lists; | |
8023 | } | |
8024 | ||
8025 | /* Parse a type-specifier. | |
8026 | ||
8027 | type-specifier: | |
8028 | simple-type-specifier | |
8029 | class-specifier | |
8030 | enum-specifier | |
8031 | elaborated-type-specifier | |
8032 | cv-qualifier | |
8033 | ||
8034 | GNU Extension: | |
8035 | ||
8036 | type-specifier: | |
8037 | __complex__ | |
8038 | ||
8039 | Returns a representation of the type-specifier. If the | |
8040 | type-specifier is a keyword (like `int' or `const', or | |
34cd5ae7 | 8041 | `__complex__') then the corresponding IDENTIFIER_NODE is returned. |
a723baf1 MM |
8042 | For a class-specifier, enum-specifier, or elaborated-type-specifier |
8043 | a TREE_TYPE is returned; otherwise, a TYPE_DECL is returned. | |
8044 | ||
8045 | If IS_FRIEND is TRUE then this type-specifier is being declared a | |
8046 | `friend'. If IS_DECLARATION is TRUE, then this type-specifier is | |
8047 | appearing in a decl-specifier-seq. | |
8048 | ||
8049 | If DECLARES_CLASS_OR_ENUM is non-NULL, and the type-specifier is a | |
8050 | class-specifier, enum-specifier, or elaborated-type-specifier, then | |
8051 | *DECLARES_CLASS_OR_ENUM is set to TRUE. Otherwise, it is set to | |
8052 | FALSE. | |
8053 | ||
8054 | If IS_CV_QUALIFIER is non-NULL, and the type-specifier is a | |
8055 | cv-qualifier, then IS_CV_QUALIFIER is set to TRUE. Otherwise, it | |
8056 | is set to FALSE. */ | |
8057 | ||
8058 | static tree | |
94edc4ab NN |
8059 | cp_parser_type_specifier (cp_parser* parser, |
8060 | cp_parser_flags flags, | |
8061 | bool is_friend, | |
8062 | bool is_declaration, | |
8063 | bool* declares_class_or_enum, | |
8064 | bool* is_cv_qualifier) | |
a723baf1 MM |
8065 | { |
8066 | tree type_spec = NULL_TREE; | |
8067 | cp_token *token; | |
8068 | enum rid keyword; | |
8069 | ||
8070 | /* Assume this type-specifier does not declare a new type. */ | |
8071 | if (declares_class_or_enum) | |
8072 | *declares_class_or_enum = false; | |
8073 | /* And that it does not specify a cv-qualifier. */ | |
8074 | if (is_cv_qualifier) | |
8075 | *is_cv_qualifier = false; | |
8076 | /* Peek at the next token. */ | |
8077 | token = cp_lexer_peek_token (parser->lexer); | |
8078 | ||
8079 | /* If we're looking at a keyword, we can use that to guide the | |
8080 | production we choose. */ | |
8081 | keyword = token->keyword; | |
8082 | switch (keyword) | |
8083 | { | |
8084 | /* Any of these indicate either a class-specifier, or an | |
8085 | elaborated-type-specifier. */ | |
8086 | case RID_CLASS: | |
8087 | case RID_STRUCT: | |
8088 | case RID_UNION: | |
8089 | case RID_ENUM: | |
8090 | /* Parse tentatively so that we can back up if we don't find a | |
8091 | class-specifier or enum-specifier. */ | |
8092 | cp_parser_parse_tentatively (parser); | |
8093 | /* Look for the class-specifier or enum-specifier. */ | |
8094 | if (keyword == RID_ENUM) | |
8095 | type_spec = cp_parser_enum_specifier (parser); | |
8096 | else | |
8097 | type_spec = cp_parser_class_specifier (parser); | |
8098 | ||
8099 | /* If that worked, we're done. */ | |
8100 | if (cp_parser_parse_definitely (parser)) | |
8101 | { | |
8102 | if (declares_class_or_enum) | |
8103 | *declares_class_or_enum = true; | |
8104 | return type_spec; | |
8105 | } | |
8106 | ||
8107 | /* Fall through. */ | |
8108 | ||
8109 | case RID_TYPENAME: | |
8110 | /* Look for an elaborated-type-specifier. */ | |
8111 | type_spec = cp_parser_elaborated_type_specifier (parser, | |
8112 | is_friend, | |
8113 | is_declaration); | |
8114 | /* We're declaring a class or enum -- unless we're using | |
8115 | `typename'. */ | |
8116 | if (declares_class_or_enum && keyword != RID_TYPENAME) | |
8117 | *declares_class_or_enum = true; | |
8118 | return type_spec; | |
8119 | ||
8120 | case RID_CONST: | |
8121 | case RID_VOLATILE: | |
8122 | case RID_RESTRICT: | |
8123 | type_spec = cp_parser_cv_qualifier_opt (parser); | |
8124 | /* Even though we call a routine that looks for an optional | |
8125 | qualifier, we know that there should be one. */ | |
8126 | my_friendly_assert (type_spec != NULL, 20000328); | |
8127 | /* This type-specifier was a cv-qualified. */ | |
8128 | if (is_cv_qualifier) | |
8129 | *is_cv_qualifier = true; | |
8130 | ||
8131 | return type_spec; | |
8132 | ||
8133 | case RID_COMPLEX: | |
8134 | /* The `__complex__' keyword is a GNU extension. */ | |
8135 | return cp_lexer_consume_token (parser->lexer)->value; | |
8136 | ||
8137 | default: | |
8138 | break; | |
8139 | } | |
8140 | ||
8141 | /* If we do not already have a type-specifier, assume we are looking | |
8142 | at a simple-type-specifier. */ | |
8143 | type_spec = cp_parser_simple_type_specifier (parser, flags); | |
8144 | ||
8145 | /* If we didn't find a type-specifier, and a type-specifier was not | |
8146 | optional in this context, issue an error message. */ | |
8147 | if (!type_spec && !(flags & CP_PARSER_FLAGS_OPTIONAL)) | |
8148 | { | |
8149 | cp_parser_error (parser, "expected type specifier"); | |
8150 | return error_mark_node; | |
8151 | } | |
8152 | ||
8153 | return type_spec; | |
8154 | } | |
8155 | ||
8156 | /* Parse a simple-type-specifier. | |
8157 | ||
8158 | simple-type-specifier: | |
8159 | :: [opt] nested-name-specifier [opt] type-name | |
8160 | :: [opt] nested-name-specifier template template-id | |
8161 | char | |
8162 | wchar_t | |
8163 | bool | |
8164 | short | |
8165 | int | |
8166 | long | |
8167 | signed | |
8168 | unsigned | |
8169 | float | |
8170 | double | |
8171 | void | |
8172 | ||
8173 | GNU Extension: | |
8174 | ||
8175 | simple-type-specifier: | |
8176 | __typeof__ unary-expression | |
8177 | __typeof__ ( type-id ) | |
8178 | ||
8179 | For the various keywords, the value returned is simply the | |
8180 | TREE_IDENTIFIER representing the keyword. For the first two | |
8181 | productions, the value returned is the indicated TYPE_DECL. */ | |
8182 | ||
8183 | static tree | |
94edc4ab | 8184 | cp_parser_simple_type_specifier (cp_parser* parser, cp_parser_flags flags) |
a723baf1 MM |
8185 | { |
8186 | tree type = NULL_TREE; | |
8187 | cp_token *token; | |
8188 | ||
8189 | /* Peek at the next token. */ | |
8190 | token = cp_lexer_peek_token (parser->lexer); | |
8191 | ||
8192 | /* If we're looking at a keyword, things are easy. */ | |
8193 | switch (token->keyword) | |
8194 | { | |
8195 | case RID_CHAR: | |
8196 | case RID_WCHAR: | |
8197 | case RID_BOOL: | |
8198 | case RID_SHORT: | |
8199 | case RID_INT: | |
8200 | case RID_LONG: | |
8201 | case RID_SIGNED: | |
8202 | case RID_UNSIGNED: | |
8203 | case RID_FLOAT: | |
8204 | case RID_DOUBLE: | |
8205 | case RID_VOID: | |
8206 | /* Consume the token. */ | |
8207 | return cp_lexer_consume_token (parser->lexer)->value; | |
8208 | ||
8209 | case RID_TYPEOF: | |
8210 | { | |
8211 | tree operand; | |
8212 | ||
8213 | /* Consume the `typeof' token. */ | |
8214 | cp_lexer_consume_token (parser->lexer); | |
8215 | /* Parse the operand to `typeof' */ | |
8216 | operand = cp_parser_sizeof_operand (parser, RID_TYPEOF); | |
8217 | /* If it is not already a TYPE, take its type. */ | |
8218 | if (!TYPE_P (operand)) | |
8219 | operand = finish_typeof (operand); | |
8220 | ||
8221 | return operand; | |
8222 | } | |
8223 | ||
8224 | default: | |
8225 | break; | |
8226 | } | |
8227 | ||
8228 | /* The type-specifier must be a user-defined type. */ | |
8229 | if (!(flags & CP_PARSER_FLAGS_NO_USER_DEFINED_TYPES)) | |
8230 | { | |
8231 | /* Don't gobble tokens or issue error messages if this is an | |
8232 | optional type-specifier. */ | |
8233 | if (flags & CP_PARSER_FLAGS_OPTIONAL) | |
8234 | cp_parser_parse_tentatively (parser); | |
8235 | ||
8236 | /* Look for the optional `::' operator. */ | |
8237 | cp_parser_global_scope_opt (parser, | |
8238 | /*current_scope_valid_p=*/false); | |
8239 | /* Look for the nested-name specifier. */ | |
8240 | cp_parser_nested_name_specifier_opt (parser, | |
8241 | /*typename_keyword_p=*/false, | |
8242 | /*check_dependency_p=*/true, | |
8243 | /*type_p=*/false); | |
8244 | /* If we have seen a nested-name-specifier, and the next token | |
8245 | is `template', then we are using the template-id production. */ | |
8246 | if (parser->scope | |
8247 | && cp_parser_optional_template_keyword (parser)) | |
8248 | { | |
8249 | /* Look for the template-id. */ | |
8250 | type = cp_parser_template_id (parser, | |
8251 | /*template_keyword_p=*/true, | |
8252 | /*check_dependency_p=*/true); | |
8253 | /* If the template-id did not name a type, we are out of | |
8254 | luck. */ | |
8255 | if (TREE_CODE (type) != TYPE_DECL) | |
8256 | { | |
8257 | cp_parser_error (parser, "expected template-id for type"); | |
8258 | type = NULL_TREE; | |
8259 | } | |
8260 | } | |
8261 | /* Otherwise, look for a type-name. */ | |
8262 | else | |
8263 | { | |
8264 | type = cp_parser_type_name (parser); | |
8265 | if (type == error_mark_node) | |
8266 | type = NULL_TREE; | |
8267 | } | |
8268 | ||
8269 | /* If it didn't work out, we don't have a TYPE. */ | |
8270 | if ((flags & CP_PARSER_FLAGS_OPTIONAL) | |
8271 | && !cp_parser_parse_definitely (parser)) | |
8272 | type = NULL_TREE; | |
8273 | } | |
8274 | ||
8275 | /* If we didn't get a type-name, issue an error message. */ | |
8276 | if (!type && !(flags & CP_PARSER_FLAGS_OPTIONAL)) | |
8277 | { | |
8278 | cp_parser_error (parser, "expected type-name"); | |
8279 | return error_mark_node; | |
8280 | } | |
8281 | ||
8282 | return type; | |
8283 | } | |
8284 | ||
8285 | /* Parse a type-name. | |
8286 | ||
8287 | type-name: | |
8288 | class-name | |
8289 | enum-name | |
8290 | typedef-name | |
8291 | ||
8292 | enum-name: | |
8293 | identifier | |
8294 | ||
8295 | typedef-name: | |
8296 | identifier | |
8297 | ||
8298 | Returns a TYPE_DECL for the the type. */ | |
8299 | ||
8300 | static tree | |
94edc4ab | 8301 | cp_parser_type_name (cp_parser* parser) |
a723baf1 MM |
8302 | { |
8303 | tree type_decl; | |
8304 | tree identifier; | |
8305 | ||
8306 | /* We can't know yet whether it is a class-name or not. */ | |
8307 | cp_parser_parse_tentatively (parser); | |
8308 | /* Try a class-name. */ | |
8309 | type_decl = cp_parser_class_name (parser, | |
8310 | /*typename_keyword_p=*/false, | |
8311 | /*template_keyword_p=*/false, | |
8312 | /*type_p=*/false, | |
a723baf1 MM |
8313 | /*check_dependency_p=*/true, |
8314 | /*class_head_p=*/false); | |
8315 | /* If it's not a class-name, keep looking. */ | |
8316 | if (!cp_parser_parse_definitely (parser)) | |
8317 | { | |
8318 | /* It must be a typedef-name or an enum-name. */ | |
8319 | identifier = cp_parser_identifier (parser); | |
8320 | if (identifier == error_mark_node) | |
8321 | return error_mark_node; | |
8322 | ||
8323 | /* Look up the type-name. */ | |
8324 | type_decl = cp_parser_lookup_name_simple (parser, identifier); | |
8325 | /* Issue an error if we did not find a type-name. */ | |
8326 | if (TREE_CODE (type_decl) != TYPE_DECL) | |
8327 | { | |
8328 | cp_parser_error (parser, "expected type-name"); | |
8329 | type_decl = error_mark_node; | |
8330 | } | |
8331 | /* Remember that the name was used in the definition of the | |
8332 | current class so that we can check later to see if the | |
8333 | meaning would have been different after the class was | |
8334 | entirely defined. */ | |
8335 | else if (type_decl != error_mark_node | |
8336 | && !parser->scope) | |
8337 | maybe_note_name_used_in_class (identifier, type_decl); | |
8338 | } | |
8339 | ||
8340 | return type_decl; | |
8341 | } | |
8342 | ||
8343 | ||
8344 | /* Parse an elaborated-type-specifier. Note that the grammar given | |
8345 | here incorporates the resolution to DR68. | |
8346 | ||
8347 | elaborated-type-specifier: | |
8348 | class-key :: [opt] nested-name-specifier [opt] identifier | |
8349 | class-key :: [opt] nested-name-specifier [opt] template [opt] template-id | |
8350 | enum :: [opt] nested-name-specifier [opt] identifier | |
8351 | typename :: [opt] nested-name-specifier identifier | |
8352 | typename :: [opt] nested-name-specifier template [opt] | |
8353 | template-id | |
8354 | ||
8355 | If IS_FRIEND is TRUE, then this elaborated-type-specifier is being | |
8356 | declared `friend'. If IS_DECLARATION is TRUE, then this | |
8357 | elaborated-type-specifier appears in a decl-specifiers-seq, i.e., | |
8358 | something is being declared. | |
8359 | ||
8360 | Returns the TYPE specified. */ | |
8361 | ||
8362 | static tree | |
94edc4ab NN |
8363 | cp_parser_elaborated_type_specifier (cp_parser* parser, |
8364 | bool is_friend, | |
8365 | bool is_declaration) | |
a723baf1 MM |
8366 | { |
8367 | enum tag_types tag_type; | |
8368 | tree identifier; | |
8369 | tree type = NULL_TREE; | |
8370 | ||
8371 | /* See if we're looking at the `enum' keyword. */ | |
8372 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_ENUM)) | |
8373 | { | |
8374 | /* Consume the `enum' token. */ | |
8375 | cp_lexer_consume_token (parser->lexer); | |
8376 | /* Remember that it's an enumeration type. */ | |
8377 | tag_type = enum_type; | |
8378 | } | |
8379 | /* Or, it might be `typename'. */ | |
8380 | else if (cp_lexer_next_token_is_keyword (parser->lexer, | |
8381 | RID_TYPENAME)) | |
8382 | { | |
8383 | /* Consume the `typename' token. */ | |
8384 | cp_lexer_consume_token (parser->lexer); | |
8385 | /* Remember that it's a `typename' type. */ | |
8386 | tag_type = typename_type; | |
8387 | /* The `typename' keyword is only allowed in templates. */ | |
8388 | if (!processing_template_decl) | |
8389 | pedwarn ("using `typename' outside of template"); | |
8390 | } | |
8391 | /* Otherwise it must be a class-key. */ | |
8392 | else | |
8393 | { | |
8394 | tag_type = cp_parser_class_key (parser); | |
8395 | if (tag_type == none_type) | |
8396 | return error_mark_node; | |
8397 | } | |
8398 | ||
8399 | /* Look for the `::' operator. */ | |
8400 | cp_parser_global_scope_opt (parser, | |
8401 | /*current_scope_valid_p=*/false); | |
8402 | /* Look for the nested-name-specifier. */ | |
8403 | if (tag_type == typename_type) | |
8fa1ad0e MM |
8404 | { |
8405 | if (cp_parser_nested_name_specifier (parser, | |
8406 | /*typename_keyword_p=*/true, | |
8407 | /*check_dependency_p=*/true, | |
8408 | /*type_p=*/true) | |
8409 | == error_mark_node) | |
8410 | return error_mark_node; | |
8411 | } | |
a723baf1 MM |
8412 | else |
8413 | /* Even though `typename' is not present, the proposed resolution | |
8414 | to Core Issue 180 says that in `class A<T>::B', `B' should be | |
8415 | considered a type-name, even if `A<T>' is dependent. */ | |
8416 | cp_parser_nested_name_specifier_opt (parser, | |
8417 | /*typename_keyword_p=*/true, | |
8418 | /*check_dependency_p=*/true, | |
8419 | /*type_p=*/true); | |
8420 | /* For everything but enumeration types, consider a template-id. */ | |
8421 | if (tag_type != enum_type) | |
8422 | { | |
8423 | bool template_p = false; | |
8424 | tree decl; | |
8425 | ||
8426 | /* Allow the `template' keyword. */ | |
8427 | template_p = cp_parser_optional_template_keyword (parser); | |
8428 | /* If we didn't see `template', we don't know if there's a | |
8429 | template-id or not. */ | |
8430 | if (!template_p) | |
8431 | cp_parser_parse_tentatively (parser); | |
8432 | /* Parse the template-id. */ | |
8433 | decl = cp_parser_template_id (parser, template_p, | |
8434 | /*check_dependency_p=*/true); | |
8435 | /* If we didn't find a template-id, look for an ordinary | |
8436 | identifier. */ | |
8437 | if (!template_p && !cp_parser_parse_definitely (parser)) | |
8438 | ; | |
8439 | /* If DECL is a TEMPLATE_ID_EXPR, and the `typename' keyword is | |
8440 | in effect, then we must assume that, upon instantiation, the | |
8441 | template will correspond to a class. */ | |
8442 | else if (TREE_CODE (decl) == TEMPLATE_ID_EXPR | |
8443 | && tag_type == typename_type) | |
8444 | type = make_typename_type (parser->scope, decl, | |
8445 | /*complain=*/1); | |
8446 | else | |
8447 | type = TREE_TYPE (decl); | |
8448 | } | |
8449 | ||
8450 | /* For an enumeration type, consider only a plain identifier. */ | |
8451 | if (!type) | |
8452 | { | |
8453 | identifier = cp_parser_identifier (parser); | |
8454 | ||
8455 | if (identifier == error_mark_node) | |
8456 | return error_mark_node; | |
8457 | ||
8458 | /* For a `typename', we needn't call xref_tag. */ | |
8459 | if (tag_type == typename_type) | |
8460 | return make_typename_type (parser->scope, identifier, | |
8461 | /*complain=*/1); | |
8462 | /* Look up a qualified name in the usual way. */ | |
8463 | if (parser->scope) | |
8464 | { | |
8465 | tree decl; | |
8466 | ||
8467 | /* In an elaborated-type-specifier, names are assumed to name | |
8468 | types, so we set IS_TYPE to TRUE when calling | |
8469 | cp_parser_lookup_name. */ | |
8470 | decl = cp_parser_lookup_name (parser, identifier, | |
a723baf1 | 8471 | /*is_type=*/true, |
eea9800f | 8472 | /*is_namespace=*/false, |
a723baf1 | 8473 | /*check_dependency=*/true); |
710b73e6 KL |
8474 | |
8475 | /* If we are parsing friend declaration, DECL may be a | |
8476 | TEMPLATE_DECL tree node here. However, we need to check | |
8477 | whether this TEMPLATE_DECL results in valid code. Consider | |
8478 | the following example: | |
8479 | ||
8480 | namespace N { | |
8481 | template <class T> class C {}; | |
8482 | } | |
8483 | class X { | |
8484 | template <class T> friend class N::C; // #1, valid code | |
8485 | }; | |
8486 | template <class T> class Y { | |
8487 | friend class N::C; // #2, invalid code | |
8488 | }; | |
8489 | ||
8490 | For both case #1 and #2, we arrive at a TEMPLATE_DECL after | |
8491 | name lookup of `N::C'. We see that friend declaration must | |
8492 | be template for the code to be valid. Note that | |
8493 | processing_template_decl does not work here since it is | |
8494 | always 1 for the above two cases. */ | |
8495 | ||
a723baf1 | 8496 | decl = (cp_parser_maybe_treat_template_as_class |
710b73e6 KL |
8497 | (decl, /*tag_name_p=*/is_friend |
8498 | && parser->num_template_parameter_lists)); | |
a723baf1 MM |
8499 | |
8500 | if (TREE_CODE (decl) != TYPE_DECL) | |
8501 | { | |
8502 | error ("expected type-name"); | |
8503 | return error_mark_node; | |
8504 | } | |
8505 | else if (TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE | |
8506 | && tag_type != enum_type) | |
8507 | error ("`%T' referred to as `%s'", TREE_TYPE (decl), | |
8508 | tag_type == record_type ? "struct" : "class"); | |
8509 | else if (TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE | |
8510 | && tag_type == enum_type) | |
8511 | error ("`%T' referred to as enum", TREE_TYPE (decl)); | |
8512 | ||
8513 | type = TREE_TYPE (decl); | |
8514 | } | |
8515 | else | |
8516 | { | |
8517 | /* An elaborated-type-specifier sometimes introduces a new type and | |
8518 | sometimes names an existing type. Normally, the rule is that it | |
8519 | introduces a new type only if there is not an existing type of | |
8520 | the same name already in scope. For example, given: | |
8521 | ||
8522 | struct S {}; | |
8523 | void f() { struct S s; } | |
8524 | ||
8525 | the `struct S' in the body of `f' is the same `struct S' as in | |
8526 | the global scope; the existing definition is used. However, if | |
8527 | there were no global declaration, this would introduce a new | |
8528 | local class named `S'. | |
8529 | ||
8530 | An exception to this rule applies to the following code: | |
8531 | ||
8532 | namespace N { struct S; } | |
8533 | ||
8534 | Here, the elaborated-type-specifier names a new type | |
8535 | unconditionally; even if there is already an `S' in the | |
8536 | containing scope this declaration names a new type. | |
8537 | This exception only applies if the elaborated-type-specifier | |
8538 | forms the complete declaration: | |
8539 | ||
8540 | [class.name] | |
8541 | ||
8542 | A declaration consisting solely of `class-key identifier ;' is | |
8543 | either a redeclaration of the name in the current scope or a | |
8544 | forward declaration of the identifier as a class name. It | |
8545 | introduces the name into the current scope. | |
8546 | ||
8547 | We are in this situation precisely when the next token is a `;'. | |
8548 | ||
8549 | An exception to the exception is that a `friend' declaration does | |
8550 | *not* name a new type; i.e., given: | |
8551 | ||
8552 | struct S { friend struct T; }; | |
8553 | ||
8554 | `T' is not a new type in the scope of `S'. | |
8555 | ||
8556 | Also, `new struct S' or `sizeof (struct S)' never results in the | |
8557 | definition of a new type; a new type can only be declared in a | |
9bcb9aae | 8558 | declaration context. */ |
a723baf1 MM |
8559 | |
8560 | type = xref_tag (tag_type, identifier, | |
8561 | /*attributes=*/NULL_TREE, | |
8562 | (is_friend | |
8563 | || !is_declaration | |
8564 | || cp_lexer_next_token_is_not (parser->lexer, | |
8565 | CPP_SEMICOLON))); | |
8566 | } | |
8567 | } | |
8568 | if (tag_type != enum_type) | |
8569 | cp_parser_check_class_key (tag_type, type); | |
8570 | return type; | |
8571 | } | |
8572 | ||
8573 | /* Parse an enum-specifier. | |
8574 | ||
8575 | enum-specifier: | |
8576 | enum identifier [opt] { enumerator-list [opt] } | |
8577 | ||
8578 | Returns an ENUM_TYPE representing the enumeration. */ | |
8579 | ||
8580 | static tree | |
94edc4ab | 8581 | cp_parser_enum_specifier (cp_parser* parser) |
a723baf1 MM |
8582 | { |
8583 | cp_token *token; | |
8584 | tree identifier = NULL_TREE; | |
8585 | tree type; | |
8586 | ||
8587 | /* Look for the `enum' keyword. */ | |
8588 | if (!cp_parser_require_keyword (parser, RID_ENUM, "`enum'")) | |
8589 | return error_mark_node; | |
8590 | /* Peek at the next token. */ | |
8591 | token = cp_lexer_peek_token (parser->lexer); | |
8592 | ||
8593 | /* See if it is an identifier. */ | |
8594 | if (token->type == CPP_NAME) | |
8595 | identifier = cp_parser_identifier (parser); | |
8596 | ||
8597 | /* Look for the `{'. */ | |
8598 | if (!cp_parser_require (parser, CPP_OPEN_BRACE, "`{'")) | |
8599 | return error_mark_node; | |
8600 | ||
8601 | /* At this point, we're going ahead with the enum-specifier, even | |
8602 | if some other problem occurs. */ | |
8603 | cp_parser_commit_to_tentative_parse (parser); | |
8604 | ||
8605 | /* Issue an error message if type-definitions are forbidden here. */ | |
8606 | cp_parser_check_type_definition (parser); | |
8607 | ||
8608 | /* Create the new type. */ | |
8609 | type = start_enum (identifier ? identifier : make_anon_name ()); | |
8610 | ||
8611 | /* Peek at the next token. */ | |
8612 | token = cp_lexer_peek_token (parser->lexer); | |
8613 | /* If it's not a `}', then there are some enumerators. */ | |
8614 | if (token->type != CPP_CLOSE_BRACE) | |
8615 | cp_parser_enumerator_list (parser, type); | |
8616 | /* Look for the `}'. */ | |
8617 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
8618 | ||
8619 | /* Finish up the enumeration. */ | |
8620 | finish_enum (type); | |
8621 | ||
8622 | return type; | |
8623 | } | |
8624 | ||
8625 | /* Parse an enumerator-list. The enumerators all have the indicated | |
8626 | TYPE. | |
8627 | ||
8628 | enumerator-list: | |
8629 | enumerator-definition | |
8630 | enumerator-list , enumerator-definition */ | |
8631 | ||
8632 | static void | |
94edc4ab | 8633 | cp_parser_enumerator_list (cp_parser* parser, tree type) |
a723baf1 MM |
8634 | { |
8635 | while (true) | |
8636 | { | |
8637 | cp_token *token; | |
8638 | ||
8639 | /* Parse an enumerator-definition. */ | |
8640 | cp_parser_enumerator_definition (parser, type); | |
8641 | /* Peek at the next token. */ | |
8642 | token = cp_lexer_peek_token (parser->lexer); | |
8643 | /* If it's not a `,', then we've reached the end of the | |
8644 | list. */ | |
8645 | if (token->type != CPP_COMMA) | |
8646 | break; | |
8647 | /* Otherwise, consume the `,' and keep going. */ | |
8648 | cp_lexer_consume_token (parser->lexer); | |
8649 | /* If the next token is a `}', there is a trailing comma. */ | |
8650 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_BRACE)) | |
8651 | { | |
8652 | if (pedantic && !in_system_header) | |
8653 | pedwarn ("comma at end of enumerator list"); | |
8654 | break; | |
8655 | } | |
8656 | } | |
8657 | } | |
8658 | ||
8659 | /* Parse an enumerator-definition. The enumerator has the indicated | |
8660 | TYPE. | |
8661 | ||
8662 | enumerator-definition: | |
8663 | enumerator | |
8664 | enumerator = constant-expression | |
8665 | ||
8666 | enumerator: | |
8667 | identifier */ | |
8668 | ||
8669 | static void | |
94edc4ab | 8670 | cp_parser_enumerator_definition (cp_parser* parser, tree type) |
a723baf1 MM |
8671 | { |
8672 | cp_token *token; | |
8673 | tree identifier; | |
8674 | tree value; | |
8675 | ||
8676 | /* Look for the identifier. */ | |
8677 | identifier = cp_parser_identifier (parser); | |
8678 | if (identifier == error_mark_node) | |
8679 | return; | |
8680 | ||
8681 | /* Peek at the next token. */ | |
8682 | token = cp_lexer_peek_token (parser->lexer); | |
8683 | /* If it's an `=', then there's an explicit value. */ | |
8684 | if (token->type == CPP_EQ) | |
8685 | { | |
8686 | /* Consume the `=' token. */ | |
8687 | cp_lexer_consume_token (parser->lexer); | |
8688 | /* Parse the value. */ | |
14d22dd6 | 8689 | value = cp_parser_constant_expression (parser, |
d17811fd | 8690 | /*allow_non_constant_p=*/false, |
14d22dd6 | 8691 | NULL); |
a723baf1 MM |
8692 | } |
8693 | else | |
8694 | value = NULL_TREE; | |
8695 | ||
8696 | /* Create the enumerator. */ | |
8697 | build_enumerator (identifier, value, type); | |
8698 | } | |
8699 | ||
8700 | /* Parse a namespace-name. | |
8701 | ||
8702 | namespace-name: | |
8703 | original-namespace-name | |
8704 | namespace-alias | |
8705 | ||
8706 | Returns the NAMESPACE_DECL for the namespace. */ | |
8707 | ||
8708 | static tree | |
94edc4ab | 8709 | cp_parser_namespace_name (cp_parser* parser) |
a723baf1 MM |
8710 | { |
8711 | tree identifier; | |
8712 | tree namespace_decl; | |
8713 | ||
8714 | /* Get the name of the namespace. */ | |
8715 | identifier = cp_parser_identifier (parser); | |
8716 | if (identifier == error_mark_node) | |
8717 | return error_mark_node; | |
8718 | ||
eea9800f MM |
8719 | /* Look up the identifier in the currently active scope. Look only |
8720 | for namespaces, due to: | |
8721 | ||
8722 | [basic.lookup.udir] | |
8723 | ||
8724 | When looking up a namespace-name in a using-directive or alias | |
8725 | definition, only namespace names are considered. | |
8726 | ||
8727 | And: | |
8728 | ||
8729 | [basic.lookup.qual] | |
8730 | ||
8731 | During the lookup of a name preceding the :: scope resolution | |
8732 | operator, object, function, and enumerator names are ignored. | |
8733 | ||
8734 | (Note that cp_parser_class_or_namespace_name only calls this | |
8735 | function if the token after the name is the scope resolution | |
8736 | operator.) */ | |
8737 | namespace_decl = cp_parser_lookup_name (parser, identifier, | |
eea9800f MM |
8738 | /*is_type=*/false, |
8739 | /*is_namespace=*/true, | |
8740 | /*check_dependency=*/true); | |
a723baf1 MM |
8741 | /* If it's not a namespace, issue an error. */ |
8742 | if (namespace_decl == error_mark_node | |
8743 | || TREE_CODE (namespace_decl) != NAMESPACE_DECL) | |
8744 | { | |
8745 | cp_parser_error (parser, "expected namespace-name"); | |
8746 | namespace_decl = error_mark_node; | |
8747 | } | |
8748 | ||
8749 | return namespace_decl; | |
8750 | } | |
8751 | ||
8752 | /* Parse a namespace-definition. | |
8753 | ||
8754 | namespace-definition: | |
8755 | named-namespace-definition | |
8756 | unnamed-namespace-definition | |
8757 | ||
8758 | named-namespace-definition: | |
8759 | original-namespace-definition | |
8760 | extension-namespace-definition | |
8761 | ||
8762 | original-namespace-definition: | |
8763 | namespace identifier { namespace-body } | |
8764 | ||
8765 | extension-namespace-definition: | |
8766 | namespace original-namespace-name { namespace-body } | |
8767 | ||
8768 | unnamed-namespace-definition: | |
8769 | namespace { namespace-body } */ | |
8770 | ||
8771 | static void | |
94edc4ab | 8772 | cp_parser_namespace_definition (cp_parser* parser) |
a723baf1 MM |
8773 | { |
8774 | tree identifier; | |
8775 | ||
8776 | /* Look for the `namespace' keyword. */ | |
8777 | cp_parser_require_keyword (parser, RID_NAMESPACE, "`namespace'"); | |
8778 | ||
8779 | /* Get the name of the namespace. We do not attempt to distinguish | |
8780 | between an original-namespace-definition and an | |
8781 | extension-namespace-definition at this point. The semantic | |
8782 | analysis routines are responsible for that. */ | |
8783 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME)) | |
8784 | identifier = cp_parser_identifier (parser); | |
8785 | else | |
8786 | identifier = NULL_TREE; | |
8787 | ||
8788 | /* Look for the `{' to start the namespace. */ | |
8789 | cp_parser_require (parser, CPP_OPEN_BRACE, "`{'"); | |
8790 | /* Start the namespace. */ | |
8791 | push_namespace (identifier); | |
8792 | /* Parse the body of the namespace. */ | |
8793 | cp_parser_namespace_body (parser); | |
8794 | /* Finish the namespace. */ | |
8795 | pop_namespace (); | |
8796 | /* Look for the final `}'. */ | |
8797 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
8798 | } | |
8799 | ||
8800 | /* Parse a namespace-body. | |
8801 | ||
8802 | namespace-body: | |
8803 | declaration-seq [opt] */ | |
8804 | ||
8805 | static void | |
94edc4ab | 8806 | cp_parser_namespace_body (cp_parser* parser) |
a723baf1 MM |
8807 | { |
8808 | cp_parser_declaration_seq_opt (parser); | |
8809 | } | |
8810 | ||
8811 | /* Parse a namespace-alias-definition. | |
8812 | ||
8813 | namespace-alias-definition: | |
8814 | namespace identifier = qualified-namespace-specifier ; */ | |
8815 | ||
8816 | static void | |
94edc4ab | 8817 | cp_parser_namespace_alias_definition (cp_parser* parser) |
a723baf1 MM |
8818 | { |
8819 | tree identifier; | |
8820 | tree namespace_specifier; | |
8821 | ||
8822 | /* Look for the `namespace' keyword. */ | |
8823 | cp_parser_require_keyword (parser, RID_NAMESPACE, "`namespace'"); | |
8824 | /* Look for the identifier. */ | |
8825 | identifier = cp_parser_identifier (parser); | |
8826 | if (identifier == error_mark_node) | |
8827 | return; | |
8828 | /* Look for the `=' token. */ | |
8829 | cp_parser_require (parser, CPP_EQ, "`='"); | |
8830 | /* Look for the qualified-namespace-specifier. */ | |
8831 | namespace_specifier | |
8832 | = cp_parser_qualified_namespace_specifier (parser); | |
8833 | /* Look for the `;' token. */ | |
8834 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
8835 | ||
8836 | /* Register the alias in the symbol table. */ | |
8837 | do_namespace_alias (identifier, namespace_specifier); | |
8838 | } | |
8839 | ||
8840 | /* Parse a qualified-namespace-specifier. | |
8841 | ||
8842 | qualified-namespace-specifier: | |
8843 | :: [opt] nested-name-specifier [opt] namespace-name | |
8844 | ||
8845 | Returns a NAMESPACE_DECL corresponding to the specified | |
8846 | namespace. */ | |
8847 | ||
8848 | static tree | |
94edc4ab | 8849 | cp_parser_qualified_namespace_specifier (cp_parser* parser) |
a723baf1 MM |
8850 | { |
8851 | /* Look for the optional `::'. */ | |
8852 | cp_parser_global_scope_opt (parser, | |
8853 | /*current_scope_valid_p=*/false); | |
8854 | ||
8855 | /* Look for the optional nested-name-specifier. */ | |
8856 | cp_parser_nested_name_specifier_opt (parser, | |
8857 | /*typename_keyword_p=*/false, | |
8858 | /*check_dependency_p=*/true, | |
8859 | /*type_p=*/false); | |
8860 | ||
8861 | return cp_parser_namespace_name (parser); | |
8862 | } | |
8863 | ||
8864 | /* Parse a using-declaration. | |
8865 | ||
8866 | using-declaration: | |
8867 | using typename [opt] :: [opt] nested-name-specifier unqualified-id ; | |
8868 | using :: unqualified-id ; */ | |
8869 | ||
8870 | static void | |
94edc4ab | 8871 | cp_parser_using_declaration (cp_parser* parser) |
a723baf1 MM |
8872 | { |
8873 | cp_token *token; | |
8874 | bool typename_p = false; | |
8875 | bool global_scope_p; | |
8876 | tree decl; | |
8877 | tree identifier; | |
8878 | tree scope; | |
8879 | ||
8880 | /* Look for the `using' keyword. */ | |
8881 | cp_parser_require_keyword (parser, RID_USING, "`using'"); | |
8882 | ||
8883 | /* Peek at the next token. */ | |
8884 | token = cp_lexer_peek_token (parser->lexer); | |
8885 | /* See if it's `typename'. */ | |
8886 | if (token->keyword == RID_TYPENAME) | |
8887 | { | |
8888 | /* Remember that we've seen it. */ | |
8889 | typename_p = true; | |
8890 | /* Consume the `typename' token. */ | |
8891 | cp_lexer_consume_token (parser->lexer); | |
8892 | } | |
8893 | ||
8894 | /* Look for the optional global scope qualification. */ | |
8895 | global_scope_p | |
8896 | = (cp_parser_global_scope_opt (parser, | |
8897 | /*current_scope_valid_p=*/false) | |
8898 | != NULL_TREE); | |
8899 | ||
8900 | /* If we saw `typename', or didn't see `::', then there must be a | |
8901 | nested-name-specifier present. */ | |
8902 | if (typename_p || !global_scope_p) | |
8903 | cp_parser_nested_name_specifier (parser, typename_p, | |
8904 | /*check_dependency_p=*/true, | |
8905 | /*type_p=*/false); | |
8906 | /* Otherwise, we could be in either of the two productions. In that | |
8907 | case, treat the nested-name-specifier as optional. */ | |
8908 | else | |
8909 | cp_parser_nested_name_specifier_opt (parser, | |
8910 | /*typename_keyword_p=*/false, | |
8911 | /*check_dependency_p=*/true, | |
8912 | /*type_p=*/false); | |
8913 | ||
8914 | /* Parse the unqualified-id. */ | |
8915 | identifier = cp_parser_unqualified_id (parser, | |
8916 | /*template_keyword_p=*/false, | |
8917 | /*check_dependency_p=*/true); | |
8918 | ||
8919 | /* The function we call to handle a using-declaration is different | |
8920 | depending on what scope we are in. */ | |
8921 | scope = current_scope (); | |
8922 | if (scope && TYPE_P (scope)) | |
8923 | { | |
8924 | /* Create the USING_DECL. */ | |
8925 | decl = do_class_using_decl (build_nt (SCOPE_REF, | |
8926 | parser->scope, | |
8927 | identifier)); | |
8928 | /* Add it to the list of members in this class. */ | |
8929 | finish_member_declaration (decl); | |
8930 | } | |
8931 | else | |
8932 | { | |
8933 | decl = cp_parser_lookup_name_simple (parser, identifier); | |
4eb6d609 MM |
8934 | if (decl == error_mark_node) |
8935 | { | |
8936 | if (parser->scope && parser->scope != global_namespace) | |
8937 | error ("`%D::%D' has not been declared", | |
8938 | parser->scope, identifier); | |
8939 | else | |
8940 | error ("`::%D' has not been declared", identifier); | |
8941 | } | |
8942 | else if (scope) | |
a723baf1 MM |
8943 | do_local_using_decl (decl); |
8944 | else | |
8945 | do_toplevel_using_decl (decl); | |
8946 | } | |
8947 | ||
8948 | /* Look for the final `;'. */ | |
8949 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
8950 | } | |
8951 | ||
8952 | /* Parse a using-directive. | |
8953 | ||
8954 | using-directive: | |
8955 | using namespace :: [opt] nested-name-specifier [opt] | |
8956 | namespace-name ; */ | |
8957 | ||
8958 | static void | |
94edc4ab | 8959 | cp_parser_using_directive (cp_parser* parser) |
a723baf1 MM |
8960 | { |
8961 | tree namespace_decl; | |
8962 | ||
8963 | /* Look for the `using' keyword. */ | |
8964 | cp_parser_require_keyword (parser, RID_USING, "`using'"); | |
8965 | /* And the `namespace' keyword. */ | |
8966 | cp_parser_require_keyword (parser, RID_NAMESPACE, "`namespace'"); | |
8967 | /* Look for the optional `::' operator. */ | |
8968 | cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false); | |
34cd5ae7 | 8969 | /* And the optional nested-name-specifier. */ |
a723baf1 MM |
8970 | cp_parser_nested_name_specifier_opt (parser, |
8971 | /*typename_keyword_p=*/false, | |
8972 | /*check_dependency_p=*/true, | |
8973 | /*type_p=*/false); | |
8974 | /* Get the namespace being used. */ | |
8975 | namespace_decl = cp_parser_namespace_name (parser); | |
8976 | /* Update the symbol table. */ | |
8977 | do_using_directive (namespace_decl); | |
8978 | /* Look for the final `;'. */ | |
8979 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
8980 | } | |
8981 | ||
8982 | /* Parse an asm-definition. | |
8983 | ||
8984 | asm-definition: | |
8985 | asm ( string-literal ) ; | |
8986 | ||
8987 | GNU Extension: | |
8988 | ||
8989 | asm-definition: | |
8990 | asm volatile [opt] ( string-literal ) ; | |
8991 | asm volatile [opt] ( string-literal : asm-operand-list [opt] ) ; | |
8992 | asm volatile [opt] ( string-literal : asm-operand-list [opt] | |
8993 | : asm-operand-list [opt] ) ; | |
8994 | asm volatile [opt] ( string-literal : asm-operand-list [opt] | |
8995 | : asm-operand-list [opt] | |
8996 | : asm-operand-list [opt] ) ; */ | |
8997 | ||
8998 | static void | |
94edc4ab | 8999 | cp_parser_asm_definition (cp_parser* parser) |
a723baf1 MM |
9000 | { |
9001 | cp_token *token; | |
9002 | tree string; | |
9003 | tree outputs = NULL_TREE; | |
9004 | tree inputs = NULL_TREE; | |
9005 | tree clobbers = NULL_TREE; | |
9006 | tree asm_stmt; | |
9007 | bool volatile_p = false; | |
9008 | bool extended_p = false; | |
9009 | ||
9010 | /* Look for the `asm' keyword. */ | |
9011 | cp_parser_require_keyword (parser, RID_ASM, "`asm'"); | |
9012 | /* See if the next token is `volatile'. */ | |
9013 | if (cp_parser_allow_gnu_extensions_p (parser) | |
9014 | && cp_lexer_next_token_is_keyword (parser->lexer, RID_VOLATILE)) | |
9015 | { | |
9016 | /* Remember that we saw the `volatile' keyword. */ | |
9017 | volatile_p = true; | |
9018 | /* Consume the token. */ | |
9019 | cp_lexer_consume_token (parser->lexer); | |
9020 | } | |
9021 | /* Look for the opening `('. */ | |
9022 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
9023 | /* Look for the string. */ | |
9024 | token = cp_parser_require (parser, CPP_STRING, "asm body"); | |
9025 | if (!token) | |
9026 | return; | |
9027 | string = token->value; | |
9028 | /* If we're allowing GNU extensions, check for the extended assembly | |
9029 | syntax. Unfortunately, the `:' tokens need not be separated by | |
9030 | a space in C, and so, for compatibility, we tolerate that here | |
9031 | too. Doing that means that we have to treat the `::' operator as | |
9032 | two `:' tokens. */ | |
9033 | if (cp_parser_allow_gnu_extensions_p (parser) | |
9034 | && at_function_scope_p () | |
9035 | && (cp_lexer_next_token_is (parser->lexer, CPP_COLON) | |
9036 | || cp_lexer_next_token_is (parser->lexer, CPP_SCOPE))) | |
9037 | { | |
9038 | bool inputs_p = false; | |
9039 | bool clobbers_p = false; | |
9040 | ||
9041 | /* The extended syntax was used. */ | |
9042 | extended_p = true; | |
9043 | ||
9044 | /* Look for outputs. */ | |
9045 | if (cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
9046 | { | |
9047 | /* Consume the `:'. */ | |
9048 | cp_lexer_consume_token (parser->lexer); | |
9049 | /* Parse the output-operands. */ | |
9050 | if (cp_lexer_next_token_is_not (parser->lexer, | |
9051 | CPP_COLON) | |
9052 | && cp_lexer_next_token_is_not (parser->lexer, | |
8caf4c38 MM |
9053 | CPP_SCOPE) |
9054 | && cp_lexer_next_token_is_not (parser->lexer, | |
9055 | CPP_CLOSE_PAREN)) | |
a723baf1 MM |
9056 | outputs = cp_parser_asm_operand_list (parser); |
9057 | } | |
9058 | /* If the next token is `::', there are no outputs, and the | |
9059 | next token is the beginning of the inputs. */ | |
9060 | else if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
9061 | { | |
9062 | /* Consume the `::' token. */ | |
9063 | cp_lexer_consume_token (parser->lexer); | |
9064 | /* The inputs are coming next. */ | |
9065 | inputs_p = true; | |
9066 | } | |
9067 | ||
9068 | /* Look for inputs. */ | |
9069 | if (inputs_p | |
9070 | || cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
9071 | { | |
9072 | if (!inputs_p) | |
9073 | /* Consume the `:'. */ | |
9074 | cp_lexer_consume_token (parser->lexer); | |
9075 | /* Parse the output-operands. */ | |
9076 | if (cp_lexer_next_token_is_not (parser->lexer, | |
9077 | CPP_COLON) | |
9078 | && cp_lexer_next_token_is_not (parser->lexer, | |
8caf4c38 MM |
9079 | CPP_SCOPE) |
9080 | && cp_lexer_next_token_is_not (parser->lexer, | |
9081 | CPP_CLOSE_PAREN)) | |
a723baf1 MM |
9082 | inputs = cp_parser_asm_operand_list (parser); |
9083 | } | |
9084 | else if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
9085 | /* The clobbers are coming next. */ | |
9086 | clobbers_p = true; | |
9087 | ||
9088 | /* Look for clobbers. */ | |
9089 | if (clobbers_p | |
9090 | || cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
9091 | { | |
9092 | if (!clobbers_p) | |
9093 | /* Consume the `:'. */ | |
9094 | cp_lexer_consume_token (parser->lexer); | |
9095 | /* Parse the clobbers. */ | |
8caf4c38 MM |
9096 | if (cp_lexer_next_token_is_not (parser->lexer, |
9097 | CPP_CLOSE_PAREN)) | |
9098 | clobbers = cp_parser_asm_clobber_list (parser); | |
a723baf1 MM |
9099 | } |
9100 | } | |
9101 | /* Look for the closing `)'. */ | |
9102 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
7efa3e22 | 9103 | cp_parser_skip_to_closing_parenthesis (parser, true, false); |
a723baf1 MM |
9104 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); |
9105 | ||
9106 | /* Create the ASM_STMT. */ | |
9107 | if (at_function_scope_p ()) | |
9108 | { | |
9109 | asm_stmt = | |
9110 | finish_asm_stmt (volatile_p | |
9111 | ? ridpointers[(int) RID_VOLATILE] : NULL_TREE, | |
9112 | string, outputs, inputs, clobbers); | |
9113 | /* If the extended syntax was not used, mark the ASM_STMT. */ | |
9114 | if (!extended_p) | |
9115 | ASM_INPUT_P (asm_stmt) = 1; | |
9116 | } | |
9117 | else | |
9118 | assemble_asm (string); | |
9119 | } | |
9120 | ||
9121 | /* Declarators [gram.dcl.decl] */ | |
9122 | ||
9123 | /* Parse an init-declarator. | |
9124 | ||
9125 | init-declarator: | |
9126 | declarator initializer [opt] | |
9127 | ||
9128 | GNU Extension: | |
9129 | ||
9130 | init-declarator: | |
9131 | declarator asm-specification [opt] attributes [opt] initializer [opt] | |
9132 | ||
9133 | The DECL_SPECIFIERS and PREFIX_ATTRIBUTES apply to this declarator. | |
c8e4f0e9 | 9134 | Returns a representation of the entity declared. If MEMBER_P is TRUE, |
cf22909c KL |
9135 | then this declarator appears in a class scope. The new DECL created |
9136 | by this declarator is returned. | |
a723baf1 MM |
9137 | |
9138 | If FUNCTION_DEFINITION_ALLOWED_P then we handle the declarator and | |
9139 | for a function-definition here as well. If the declarator is a | |
9140 | declarator for a function-definition, *FUNCTION_DEFINITION_P will | |
9141 | be TRUE upon return. By that point, the function-definition will | |
9142 | have been completely parsed. | |
9143 | ||
9144 | FUNCTION_DEFINITION_P may be NULL if FUNCTION_DEFINITION_ALLOWED_P | |
9145 | is FALSE. */ | |
9146 | ||
9147 | static tree | |
94edc4ab NN |
9148 | cp_parser_init_declarator (cp_parser* parser, |
9149 | tree decl_specifiers, | |
9150 | tree prefix_attributes, | |
9151 | bool function_definition_allowed_p, | |
9152 | bool member_p, | |
9153 | bool* function_definition_p) | |
a723baf1 MM |
9154 | { |
9155 | cp_token *token; | |
9156 | tree declarator; | |
9157 | tree attributes; | |
9158 | tree asm_specification; | |
9159 | tree initializer; | |
9160 | tree decl = NULL_TREE; | |
9161 | tree scope; | |
a723baf1 MM |
9162 | bool is_initialized; |
9163 | bool is_parenthesized_init; | |
39703eb9 | 9164 | bool is_non_constant_init; |
7efa3e22 | 9165 | int ctor_dtor_or_conv_p; |
a723baf1 MM |
9166 | bool friend_p; |
9167 | ||
9168 | /* Assume that this is not the declarator for a function | |
9169 | definition. */ | |
9170 | if (function_definition_p) | |
9171 | *function_definition_p = false; | |
9172 | ||
9173 | /* Defer access checks while parsing the declarator; we cannot know | |
9174 | what names are accessible until we know what is being | |
9175 | declared. */ | |
cf22909c KL |
9176 | resume_deferring_access_checks (); |
9177 | ||
a723baf1 MM |
9178 | /* Parse the declarator. */ |
9179 | declarator | |
62b8a44e | 9180 | = cp_parser_declarator (parser, CP_PARSER_DECLARATOR_NAMED, |
a723baf1 MM |
9181 | &ctor_dtor_or_conv_p); |
9182 | /* Gather up the deferred checks. */ | |
cf22909c | 9183 | stop_deferring_access_checks (); |
24c0ef37 | 9184 | |
a723baf1 MM |
9185 | /* If the DECLARATOR was erroneous, there's no need to go |
9186 | further. */ | |
9187 | if (declarator == error_mark_node) | |
cf22909c | 9188 | return error_mark_node; |
a723baf1 MM |
9189 | |
9190 | /* Figure out what scope the entity declared by the DECLARATOR is | |
9191 | located in. `grokdeclarator' sometimes changes the scope, so | |
9192 | we compute it now. */ | |
9193 | scope = get_scope_of_declarator (declarator); | |
9194 | ||
9195 | /* If we're allowing GNU extensions, look for an asm-specification | |
9196 | and attributes. */ | |
9197 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
9198 | { | |
9199 | /* Look for an asm-specification. */ | |
9200 | asm_specification = cp_parser_asm_specification_opt (parser); | |
9201 | /* And attributes. */ | |
9202 | attributes = cp_parser_attributes_opt (parser); | |
9203 | } | |
9204 | else | |
9205 | { | |
9206 | asm_specification = NULL_TREE; | |
9207 | attributes = NULL_TREE; | |
9208 | } | |
9209 | ||
9210 | /* Peek at the next token. */ | |
9211 | token = cp_lexer_peek_token (parser->lexer); | |
9212 | /* Check to see if the token indicates the start of a | |
9213 | function-definition. */ | |
9214 | if (cp_parser_token_starts_function_definition_p (token)) | |
9215 | { | |
9216 | if (!function_definition_allowed_p) | |
9217 | { | |
9218 | /* If a function-definition should not appear here, issue an | |
9219 | error message. */ | |
9220 | cp_parser_error (parser, | |
9221 | "a function-definition is not allowed here"); | |
9222 | return error_mark_node; | |
9223 | } | |
9224 | else | |
9225 | { | |
a723baf1 MM |
9226 | /* Neither attributes nor an asm-specification are allowed |
9227 | on a function-definition. */ | |
9228 | if (asm_specification) | |
9229 | error ("an asm-specification is not allowed on a function-definition"); | |
9230 | if (attributes) | |
9231 | error ("attributes are not allowed on a function-definition"); | |
9232 | /* This is a function-definition. */ | |
9233 | *function_definition_p = true; | |
9234 | ||
a723baf1 MM |
9235 | /* Parse the function definition. */ |
9236 | decl = (cp_parser_function_definition_from_specifiers_and_declarator | |
cf22909c | 9237 | (parser, decl_specifiers, prefix_attributes, declarator)); |
24c0ef37 | 9238 | |
a723baf1 MM |
9239 | return decl; |
9240 | } | |
9241 | } | |
9242 | ||
9243 | /* [dcl.dcl] | |
9244 | ||
9245 | Only in function declarations for constructors, destructors, and | |
9246 | type conversions can the decl-specifier-seq be omitted. | |
9247 | ||
9248 | We explicitly postpone this check past the point where we handle | |
9249 | function-definitions because we tolerate function-definitions | |
9250 | that are missing their return types in some modes. */ | |
7efa3e22 | 9251 | if (!decl_specifiers && ctor_dtor_or_conv_p <= 0) |
a723baf1 MM |
9252 | { |
9253 | cp_parser_error (parser, | |
9254 | "expected constructor, destructor, or type conversion"); | |
9255 | return error_mark_node; | |
9256 | } | |
9257 | ||
9258 | /* An `=' or an `(' indicates an initializer. */ | |
9259 | is_initialized = (token->type == CPP_EQ | |
9260 | || token->type == CPP_OPEN_PAREN); | |
9261 | /* If the init-declarator isn't initialized and isn't followed by a | |
9262 | `,' or `;', it's not a valid init-declarator. */ | |
9263 | if (!is_initialized | |
9264 | && token->type != CPP_COMMA | |
9265 | && token->type != CPP_SEMICOLON) | |
9266 | { | |
9267 | cp_parser_error (parser, "expected init-declarator"); | |
9268 | return error_mark_node; | |
9269 | } | |
9270 | ||
9271 | /* Because start_decl has side-effects, we should only call it if we | |
9272 | know we're going ahead. By this point, we know that we cannot | |
9273 | possibly be looking at any other construct. */ | |
9274 | cp_parser_commit_to_tentative_parse (parser); | |
9275 | ||
9276 | /* Check to see whether or not this declaration is a friend. */ | |
9277 | friend_p = cp_parser_friend_p (decl_specifiers); | |
9278 | ||
9279 | /* Check that the number of template-parameter-lists is OK. */ | |
9280 | if (!cp_parser_check_declarator_template_parameters (parser, | |
9281 | declarator)) | |
cf22909c | 9282 | return error_mark_node; |
a723baf1 MM |
9283 | |
9284 | /* Enter the newly declared entry in the symbol table. If we're | |
9285 | processing a declaration in a class-specifier, we wait until | |
9286 | after processing the initializer. */ | |
9287 | if (!member_p) | |
9288 | { | |
9289 | if (parser->in_unbraced_linkage_specification_p) | |
9290 | { | |
9291 | decl_specifiers = tree_cons (error_mark_node, | |
9292 | get_identifier ("extern"), | |
9293 | decl_specifiers); | |
9294 | have_extern_spec = false; | |
9295 | } | |
9296 | decl = start_decl (declarator, | |
9297 | decl_specifiers, | |
9298 | is_initialized, | |
9299 | attributes, | |
9300 | prefix_attributes); | |
9301 | } | |
9302 | ||
9303 | /* Enter the SCOPE. That way unqualified names appearing in the | |
9304 | initializer will be looked up in SCOPE. */ | |
9305 | if (scope) | |
9306 | push_scope (scope); | |
9307 | ||
9308 | /* Perform deferred access control checks, now that we know in which | |
9309 | SCOPE the declared entity resides. */ | |
9310 | if (!member_p && decl) | |
9311 | { | |
9312 | tree saved_current_function_decl = NULL_TREE; | |
9313 | ||
9314 | /* If the entity being declared is a function, pretend that we | |
9315 | are in its scope. If it is a `friend', it may have access to | |
9bcb9aae | 9316 | things that would not otherwise be accessible. */ |
a723baf1 MM |
9317 | if (TREE_CODE (decl) == FUNCTION_DECL) |
9318 | { | |
9319 | saved_current_function_decl = current_function_decl; | |
9320 | current_function_decl = decl; | |
9321 | } | |
9322 | ||
cf22909c KL |
9323 | /* Perform the access control checks for the declarator and the |
9324 | the decl-specifiers. */ | |
9325 | perform_deferred_access_checks (); | |
a723baf1 MM |
9326 | |
9327 | /* Restore the saved value. */ | |
9328 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
9329 | current_function_decl = saved_current_function_decl; | |
9330 | } | |
9331 | ||
9332 | /* Parse the initializer. */ | |
9333 | if (is_initialized) | |
39703eb9 MM |
9334 | initializer = cp_parser_initializer (parser, |
9335 | &is_parenthesized_init, | |
9336 | &is_non_constant_init); | |
a723baf1 MM |
9337 | else |
9338 | { | |
9339 | initializer = NULL_TREE; | |
9340 | is_parenthesized_init = false; | |
39703eb9 | 9341 | is_non_constant_init = true; |
a723baf1 MM |
9342 | } |
9343 | ||
9344 | /* The old parser allows attributes to appear after a parenthesized | |
9345 | initializer. Mark Mitchell proposed removing this functionality | |
9346 | on the GCC mailing lists on 2002-08-13. This parser accepts the | |
9347 | attributes -- but ignores them. */ | |
9348 | if (cp_parser_allow_gnu_extensions_p (parser) && is_parenthesized_init) | |
9349 | if (cp_parser_attributes_opt (parser)) | |
9350 | warning ("attributes after parenthesized initializer ignored"); | |
9351 | ||
9352 | /* Leave the SCOPE, now that we have processed the initializer. It | |
9353 | is important to do this before calling cp_finish_decl because it | |
9354 | makes decisions about whether to create DECL_STMTs or not based | |
9355 | on the current scope. */ | |
9356 | if (scope) | |
9357 | pop_scope (scope); | |
9358 | ||
9359 | /* For an in-class declaration, use `grokfield' to create the | |
9360 | declaration. */ | |
9361 | if (member_p) | |
8db1028e NS |
9362 | { |
9363 | decl = grokfield (declarator, decl_specifiers, | |
9364 | initializer, /*asmspec=*/NULL_TREE, | |
a723baf1 | 9365 | /*attributes=*/NULL_TREE); |
8db1028e NS |
9366 | if (decl && TREE_CODE (decl) == FUNCTION_DECL) |
9367 | cp_parser_save_default_args (parser, decl); | |
9368 | } | |
9369 | ||
a723baf1 MM |
9370 | /* Finish processing the declaration. But, skip friend |
9371 | declarations. */ | |
9372 | if (!friend_p && decl) | |
9373 | cp_finish_decl (decl, | |
9374 | initializer, | |
9375 | asm_specification, | |
9376 | /* If the initializer is in parentheses, then this is | |
9377 | a direct-initialization, which means that an | |
9378 | `explicit' constructor is OK. Otherwise, an | |
9379 | `explicit' constructor cannot be used. */ | |
9380 | ((is_parenthesized_init || !is_initialized) | |
9381 | ? 0 : LOOKUP_ONLYCONVERTING)); | |
9382 | ||
39703eb9 MM |
9383 | /* Remember whether or not variables were initialized by |
9384 | constant-expressions. */ | |
9385 | if (decl && TREE_CODE (decl) == VAR_DECL | |
9386 | && is_initialized && !is_non_constant_init) | |
9387 | DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = true; | |
9388 | ||
a723baf1 MM |
9389 | return decl; |
9390 | } | |
9391 | ||
9392 | /* Parse a declarator. | |
9393 | ||
9394 | declarator: | |
9395 | direct-declarator | |
9396 | ptr-operator declarator | |
9397 | ||
9398 | abstract-declarator: | |
9399 | ptr-operator abstract-declarator [opt] | |
9400 | direct-abstract-declarator | |
9401 | ||
9402 | GNU Extensions: | |
9403 | ||
9404 | declarator: | |
9405 | attributes [opt] direct-declarator | |
9406 | attributes [opt] ptr-operator declarator | |
9407 | ||
9408 | abstract-declarator: | |
9409 | attributes [opt] ptr-operator abstract-declarator [opt] | |
9410 | attributes [opt] direct-abstract-declarator | |
9411 | ||
9412 | Returns a representation of the declarator. If the declarator has | |
9413 | the form `* declarator', then an INDIRECT_REF is returned, whose | |
34cd5ae7 | 9414 | only operand is the sub-declarator. Analogously, `& declarator' is |
a723baf1 MM |
9415 | represented as an ADDR_EXPR. For `X::* declarator', a SCOPE_REF is |
9416 | used. The first operand is the TYPE for `X'. The second operand | |
9417 | is an INDIRECT_REF whose operand is the sub-declarator. | |
9418 | ||
34cd5ae7 | 9419 | Otherwise, the representation is as for a direct-declarator. |
a723baf1 MM |
9420 | |
9421 | (It would be better to define a structure type to represent | |
9422 | declarators, rather than abusing `tree' nodes to represent | |
9423 | declarators. That would be much clearer and save some memory. | |
9424 | There is no reason for declarators to be garbage-collected, for | |
9425 | example; they are created during parser and no longer needed after | |
9426 | `grokdeclarator' has been called.) | |
9427 | ||
9428 | For a ptr-operator that has the optional cv-qualifier-seq, | |
9429 | cv-qualifiers will be stored in the TREE_TYPE of the INDIRECT_REF | |
9430 | node. | |
9431 | ||
7efa3e22 NS |
9432 | If CTOR_DTOR_OR_CONV_P is not NULL, *CTOR_DTOR_OR_CONV_P is used to |
9433 | detect constructor, destructor or conversion operators. It is set | |
9434 | to -1 if the declarator is a name, and +1 if it is a | |
9435 | function. Otherwise it is set to zero. Usually you just want to | |
9436 | test for >0, but internally the negative value is used. | |
9437 | ||
a723baf1 MM |
9438 | (The reason for CTOR_DTOR_OR_CONV_P is that a declaration must have |
9439 | a decl-specifier-seq unless it declares a constructor, destructor, | |
9440 | or conversion. It might seem that we could check this condition in | |
9441 | semantic analysis, rather than parsing, but that makes it difficult | |
9442 | to handle something like `f()'. We want to notice that there are | |
9443 | no decl-specifiers, and therefore realize that this is an | |
9444 | expression, not a declaration.) */ | |
9445 | ||
9446 | static tree | |
94edc4ab NN |
9447 | cp_parser_declarator (cp_parser* parser, |
9448 | cp_parser_declarator_kind dcl_kind, | |
7efa3e22 | 9449 | int* ctor_dtor_or_conv_p) |
a723baf1 MM |
9450 | { |
9451 | cp_token *token; | |
9452 | tree declarator; | |
9453 | enum tree_code code; | |
9454 | tree cv_qualifier_seq; | |
9455 | tree class_type; | |
9456 | tree attributes = NULL_TREE; | |
9457 | ||
9458 | /* Assume this is not a constructor, destructor, or type-conversion | |
9459 | operator. */ | |
9460 | if (ctor_dtor_or_conv_p) | |
7efa3e22 | 9461 | *ctor_dtor_or_conv_p = 0; |
a723baf1 MM |
9462 | |
9463 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
9464 | attributes = cp_parser_attributes_opt (parser); | |
9465 | ||
9466 | /* Peek at the next token. */ | |
9467 | token = cp_lexer_peek_token (parser->lexer); | |
9468 | ||
9469 | /* Check for the ptr-operator production. */ | |
9470 | cp_parser_parse_tentatively (parser); | |
9471 | /* Parse the ptr-operator. */ | |
9472 | code = cp_parser_ptr_operator (parser, | |
9473 | &class_type, | |
9474 | &cv_qualifier_seq); | |
9475 | /* If that worked, then we have a ptr-operator. */ | |
9476 | if (cp_parser_parse_definitely (parser)) | |
9477 | { | |
9478 | /* The dependent declarator is optional if we are parsing an | |
9479 | abstract-declarator. */ | |
62b8a44e | 9480 | if (dcl_kind != CP_PARSER_DECLARATOR_NAMED) |
a723baf1 MM |
9481 | cp_parser_parse_tentatively (parser); |
9482 | ||
9483 | /* Parse the dependent declarator. */ | |
62b8a44e | 9484 | declarator = cp_parser_declarator (parser, dcl_kind, |
a723baf1 MM |
9485 | /*ctor_dtor_or_conv_p=*/NULL); |
9486 | ||
9487 | /* If we are parsing an abstract-declarator, we must handle the | |
9488 | case where the dependent declarator is absent. */ | |
62b8a44e NS |
9489 | if (dcl_kind != CP_PARSER_DECLARATOR_NAMED |
9490 | && !cp_parser_parse_definitely (parser)) | |
a723baf1 MM |
9491 | declarator = NULL_TREE; |
9492 | ||
9493 | /* Build the representation of the ptr-operator. */ | |
9494 | if (code == INDIRECT_REF) | |
9495 | declarator = make_pointer_declarator (cv_qualifier_seq, | |
9496 | declarator); | |
9497 | else | |
9498 | declarator = make_reference_declarator (cv_qualifier_seq, | |
9499 | declarator); | |
9500 | /* Handle the pointer-to-member case. */ | |
9501 | if (class_type) | |
9502 | declarator = build_nt (SCOPE_REF, class_type, declarator); | |
9503 | } | |
9504 | /* Everything else is a direct-declarator. */ | |
9505 | else | |
7efa3e22 | 9506 | declarator = cp_parser_direct_declarator (parser, dcl_kind, |
a723baf1 MM |
9507 | ctor_dtor_or_conv_p); |
9508 | ||
9509 | if (attributes && declarator != error_mark_node) | |
9510 | declarator = tree_cons (attributes, declarator, NULL_TREE); | |
9511 | ||
9512 | return declarator; | |
9513 | } | |
9514 | ||
9515 | /* Parse a direct-declarator or direct-abstract-declarator. | |
9516 | ||
9517 | direct-declarator: | |
9518 | declarator-id | |
9519 | direct-declarator ( parameter-declaration-clause ) | |
9520 | cv-qualifier-seq [opt] | |
9521 | exception-specification [opt] | |
9522 | direct-declarator [ constant-expression [opt] ] | |
9523 | ( declarator ) | |
9524 | ||
9525 | direct-abstract-declarator: | |
9526 | direct-abstract-declarator [opt] | |
9527 | ( parameter-declaration-clause ) | |
9528 | cv-qualifier-seq [opt] | |
9529 | exception-specification [opt] | |
9530 | direct-abstract-declarator [opt] [ constant-expression [opt] ] | |
9531 | ( abstract-declarator ) | |
9532 | ||
62b8a44e NS |
9533 | Returns a representation of the declarator. DCL_KIND is |
9534 | CP_PARSER_DECLARATOR_ABSTRACT, if we are parsing a | |
9535 | direct-abstract-declarator. It is CP_PARSER_DECLARATOR_NAMED, if | |
9536 | we are parsing a direct-declarator. It is | |
9537 | CP_PARSER_DECLARATOR_EITHER, if we can accept either - in the case | |
9538 | of ambiguity we prefer an abstract declarator, as per | |
9539 | [dcl.ambig.res]. CTOR_DTOR_OR_CONV_P is as for | |
a723baf1 MM |
9540 | cp_parser_declarator. |
9541 | ||
9542 | For the declarator-id production, the representation is as for an | |
9543 | id-expression, except that a qualified name is represented as a | |
9544 | SCOPE_REF. A function-declarator is represented as a CALL_EXPR; | |
9545 | see the documentation of the FUNCTION_DECLARATOR_* macros for | |
9546 | information about how to find the various declarator components. | |
9547 | An array-declarator is represented as an ARRAY_REF. The | |
9548 | direct-declarator is the first operand; the constant-expression | |
9549 | indicating the size of the array is the second operand. */ | |
9550 | ||
9551 | static tree | |
94edc4ab NN |
9552 | cp_parser_direct_declarator (cp_parser* parser, |
9553 | cp_parser_declarator_kind dcl_kind, | |
7efa3e22 | 9554 | int* ctor_dtor_or_conv_p) |
a723baf1 MM |
9555 | { |
9556 | cp_token *token; | |
62b8a44e | 9557 | tree declarator = NULL_TREE; |
a723baf1 MM |
9558 | tree scope = NULL_TREE; |
9559 | bool saved_default_arg_ok_p = parser->default_arg_ok_p; | |
9560 | bool saved_in_declarator_p = parser->in_declarator_p; | |
62b8a44e NS |
9561 | bool first = true; |
9562 | ||
9563 | while (true) | |
a723baf1 | 9564 | { |
62b8a44e NS |
9565 | /* Peek at the next token. */ |
9566 | token = cp_lexer_peek_token (parser->lexer); | |
9567 | if (token->type == CPP_OPEN_PAREN) | |
a723baf1 | 9568 | { |
62b8a44e NS |
9569 | /* This is either a parameter-declaration-clause, or a |
9570 | parenthesized declarator. When we know we are parsing a | |
34cd5ae7 | 9571 | named declarator, it must be a parenthesized declarator |
62b8a44e NS |
9572 | if FIRST is true. For instance, `(int)' is a |
9573 | parameter-declaration-clause, with an omitted | |
9574 | direct-abstract-declarator. But `((*))', is a | |
9575 | parenthesized abstract declarator. Finally, when T is a | |
9576 | template parameter `(T)' is a | |
34cd5ae7 | 9577 | parameter-declaration-clause, and not a parenthesized |
62b8a44e | 9578 | named declarator. |
a723baf1 | 9579 | |
62b8a44e NS |
9580 | We first try and parse a parameter-declaration-clause, |
9581 | and then try a nested declarator (if FIRST is true). | |
a723baf1 | 9582 | |
62b8a44e NS |
9583 | It is not an error for it not to be a |
9584 | parameter-declaration-clause, even when FIRST is | |
9585 | false. Consider, | |
9586 | ||
9587 | int i (int); | |
9588 | int i (3); | |
9589 | ||
9590 | The first is the declaration of a function while the | |
9591 | second is a the definition of a variable, including its | |
9592 | initializer. | |
9593 | ||
9594 | Having seen only the parenthesis, we cannot know which of | |
9595 | these two alternatives should be selected. Even more | |
9596 | complex are examples like: | |
9597 | ||
9598 | int i (int (a)); | |
9599 | int i (int (3)); | |
9600 | ||
9601 | The former is a function-declaration; the latter is a | |
9602 | variable initialization. | |
9603 | ||
34cd5ae7 | 9604 | Thus again, we try a parameter-declaration-clause, and if |
62b8a44e NS |
9605 | that fails, we back out and return. */ |
9606 | ||
9607 | if (!first || dcl_kind != CP_PARSER_DECLARATOR_NAMED) | |
a723baf1 | 9608 | { |
62b8a44e NS |
9609 | tree params; |
9610 | ||
9611 | cp_parser_parse_tentatively (parser); | |
a723baf1 | 9612 | |
62b8a44e NS |
9613 | /* Consume the `('. */ |
9614 | cp_lexer_consume_token (parser->lexer); | |
9615 | if (first) | |
9616 | { | |
9617 | /* If this is going to be an abstract declarator, we're | |
9618 | in a declarator and we can't have default args. */ | |
9619 | parser->default_arg_ok_p = false; | |
9620 | parser->in_declarator_p = true; | |
9621 | } | |
9622 | ||
9623 | /* Parse the parameter-declaration-clause. */ | |
9624 | params = cp_parser_parameter_declaration_clause (parser); | |
9625 | ||
9626 | /* If all went well, parse the cv-qualifier-seq and the | |
34cd5ae7 | 9627 | exception-specification. */ |
62b8a44e NS |
9628 | if (cp_parser_parse_definitely (parser)) |
9629 | { | |
9630 | tree cv_qualifiers; | |
9631 | tree exception_specification; | |
7efa3e22 NS |
9632 | |
9633 | if (ctor_dtor_or_conv_p) | |
9634 | *ctor_dtor_or_conv_p = *ctor_dtor_or_conv_p < 0; | |
62b8a44e NS |
9635 | first = false; |
9636 | /* Consume the `)'. */ | |
9637 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
9638 | ||
9639 | /* Parse the cv-qualifier-seq. */ | |
9640 | cv_qualifiers = cp_parser_cv_qualifier_seq_opt (parser); | |
9641 | /* And the exception-specification. */ | |
9642 | exception_specification | |
9643 | = cp_parser_exception_specification_opt (parser); | |
9644 | ||
9645 | /* Create the function-declarator. */ | |
9646 | declarator = make_call_declarator (declarator, | |
9647 | params, | |
9648 | cv_qualifiers, | |
9649 | exception_specification); | |
9650 | /* Any subsequent parameter lists are to do with | |
9651 | return type, so are not those of the declared | |
9652 | function. */ | |
9653 | parser->default_arg_ok_p = false; | |
9654 | ||
9655 | /* Repeat the main loop. */ | |
9656 | continue; | |
9657 | } | |
9658 | } | |
9659 | ||
9660 | /* If this is the first, we can try a parenthesized | |
9661 | declarator. */ | |
9662 | if (first) | |
a723baf1 | 9663 | { |
a723baf1 | 9664 | parser->default_arg_ok_p = saved_default_arg_ok_p; |
62b8a44e NS |
9665 | parser->in_declarator_p = saved_in_declarator_p; |
9666 | ||
9667 | /* Consume the `('. */ | |
9668 | cp_lexer_consume_token (parser->lexer); | |
9669 | /* Parse the nested declarator. */ | |
9670 | declarator | |
9671 | = cp_parser_declarator (parser, dcl_kind, ctor_dtor_or_conv_p); | |
9672 | first = false; | |
9673 | /* Expect a `)'. */ | |
9674 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
9675 | declarator = error_mark_node; | |
9676 | if (declarator == error_mark_node) | |
9677 | break; | |
9678 | ||
9679 | goto handle_declarator; | |
a723baf1 | 9680 | } |
9bcb9aae | 9681 | /* Otherwise, we must be done. */ |
62b8a44e NS |
9682 | else |
9683 | break; | |
a723baf1 | 9684 | } |
62b8a44e NS |
9685 | else if ((!first || dcl_kind != CP_PARSER_DECLARATOR_NAMED) |
9686 | && token->type == CPP_OPEN_SQUARE) | |
a723baf1 | 9687 | { |
62b8a44e | 9688 | /* Parse an array-declarator. */ |
a723baf1 MM |
9689 | tree bounds; |
9690 | ||
7efa3e22 NS |
9691 | if (ctor_dtor_or_conv_p) |
9692 | *ctor_dtor_or_conv_p = 0; | |
9693 | ||
62b8a44e NS |
9694 | first = false; |
9695 | parser->default_arg_ok_p = false; | |
9696 | parser->in_declarator_p = true; | |
a723baf1 MM |
9697 | /* Consume the `['. */ |
9698 | cp_lexer_consume_token (parser->lexer); | |
9699 | /* Peek at the next token. */ | |
9700 | token = cp_lexer_peek_token (parser->lexer); | |
9701 | /* If the next token is `]', then there is no | |
9702 | constant-expression. */ | |
9703 | if (token->type != CPP_CLOSE_SQUARE) | |
14d22dd6 MM |
9704 | { |
9705 | bool non_constant_p; | |
9706 | ||
9707 | bounds | |
9708 | = cp_parser_constant_expression (parser, | |
9709 | /*allow_non_constant=*/true, | |
9710 | &non_constant_p); | |
d17811fd MM |
9711 | if (!non_constant_p) |
9712 | bounds = cp_parser_fold_non_dependent_expr (bounds); | |
14d22dd6 | 9713 | } |
a723baf1 MM |
9714 | else |
9715 | bounds = NULL_TREE; | |
9716 | /* Look for the closing `]'. */ | |
62b8a44e NS |
9717 | if (!cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'")) |
9718 | { | |
9719 | declarator = error_mark_node; | |
9720 | break; | |
9721 | } | |
a723baf1 MM |
9722 | |
9723 | declarator = build_nt (ARRAY_REF, declarator, bounds); | |
9724 | } | |
62b8a44e | 9725 | else if (first && dcl_kind != CP_PARSER_DECLARATOR_ABSTRACT) |
a723baf1 | 9726 | { |
62b8a44e NS |
9727 | /* Parse a declarator_id */ |
9728 | if (dcl_kind == CP_PARSER_DECLARATOR_EITHER) | |
9729 | cp_parser_parse_tentatively (parser); | |
9730 | declarator = cp_parser_declarator_id (parser); | |
712becab NS |
9731 | if (dcl_kind == CP_PARSER_DECLARATOR_EITHER) |
9732 | { | |
9733 | if (!cp_parser_parse_definitely (parser)) | |
9734 | declarator = error_mark_node; | |
9735 | else if (TREE_CODE (declarator) != IDENTIFIER_NODE) | |
9736 | { | |
9737 | cp_parser_error (parser, "expected unqualified-id"); | |
9738 | declarator = error_mark_node; | |
9739 | } | |
9740 | } | |
9741 | ||
62b8a44e NS |
9742 | if (declarator == error_mark_node) |
9743 | break; | |
a723baf1 | 9744 | |
62b8a44e NS |
9745 | if (TREE_CODE (declarator) == SCOPE_REF) |
9746 | { | |
9747 | tree scope = TREE_OPERAND (declarator, 0); | |
712becab | 9748 | |
62b8a44e NS |
9749 | /* In the declaration of a member of a template class |
9750 | outside of the class itself, the SCOPE will sometimes | |
9751 | be a TYPENAME_TYPE. For example, given: | |
9752 | ||
9753 | template <typename T> | |
9754 | int S<T>::R::i = 3; | |
9755 | ||
9756 | the SCOPE will be a TYPENAME_TYPE for `S<T>::R'. In | |
9757 | this context, we must resolve S<T>::R to an ordinary | |
9758 | type, rather than a typename type. | |
9759 | ||
9760 | The reason we normally avoid resolving TYPENAME_TYPEs | |
9761 | is that a specialization of `S' might render | |
9762 | `S<T>::R' not a type. However, if `S' is | |
9763 | specialized, then this `i' will not be used, so there | |
9764 | is no harm in resolving the types here. */ | |
9765 | if (TREE_CODE (scope) == TYPENAME_TYPE) | |
9766 | { | |
14d22dd6 MM |
9767 | tree type; |
9768 | ||
62b8a44e | 9769 | /* Resolve the TYPENAME_TYPE. */ |
14d22dd6 MM |
9770 | type = resolve_typename_type (scope, |
9771 | /*only_current_p=*/false); | |
62b8a44e | 9772 | /* If that failed, the declarator is invalid. */ |
14d22dd6 MM |
9773 | if (type != error_mark_node) |
9774 | scope = type; | |
62b8a44e NS |
9775 | /* Build a new DECLARATOR. */ |
9776 | declarator = build_nt (SCOPE_REF, | |
9777 | scope, | |
9778 | TREE_OPERAND (declarator, 1)); | |
9779 | } | |
9780 | } | |
9781 | ||
9782 | /* Check to see whether the declarator-id names a constructor, | |
9783 | destructor, or conversion. */ | |
9784 | if (declarator && ctor_dtor_or_conv_p | |
9785 | && ((TREE_CODE (declarator) == SCOPE_REF | |
9786 | && CLASS_TYPE_P (TREE_OPERAND (declarator, 0))) | |
9787 | || (TREE_CODE (declarator) != SCOPE_REF | |
9788 | && at_class_scope_p ()))) | |
a723baf1 | 9789 | { |
62b8a44e NS |
9790 | tree unqualified_name; |
9791 | tree class_type; | |
9792 | ||
9793 | /* Get the unqualified part of the name. */ | |
9794 | if (TREE_CODE (declarator) == SCOPE_REF) | |
9795 | { | |
9796 | class_type = TREE_OPERAND (declarator, 0); | |
9797 | unqualified_name = TREE_OPERAND (declarator, 1); | |
9798 | } | |
9799 | else | |
9800 | { | |
9801 | class_type = current_class_type; | |
9802 | unqualified_name = declarator; | |
9803 | } | |
9804 | ||
9805 | /* See if it names ctor, dtor or conv. */ | |
9806 | if (TREE_CODE (unqualified_name) == BIT_NOT_EXPR | |
9807 | || IDENTIFIER_TYPENAME_P (unqualified_name) | |
9808 | || constructor_name_p (unqualified_name, class_type)) | |
7efa3e22 | 9809 | *ctor_dtor_or_conv_p = -1; |
a723baf1 | 9810 | } |
62b8a44e NS |
9811 | |
9812 | handle_declarator:; | |
9813 | scope = get_scope_of_declarator (declarator); | |
9814 | if (scope) | |
9815 | /* Any names that appear after the declarator-id for a member | |
9816 | are looked up in the containing scope. */ | |
9817 | push_scope (scope); | |
9818 | parser->in_declarator_p = true; | |
9819 | if ((ctor_dtor_or_conv_p && *ctor_dtor_or_conv_p) | |
9820 | || (declarator | |
9821 | && (TREE_CODE (declarator) == SCOPE_REF | |
9822 | || TREE_CODE (declarator) == IDENTIFIER_NODE))) | |
9823 | /* Default args are only allowed on function | |
9824 | declarations. */ | |
9825 | parser->default_arg_ok_p = saved_default_arg_ok_p; | |
a723baf1 | 9826 | else |
62b8a44e NS |
9827 | parser->default_arg_ok_p = false; |
9828 | ||
9829 | first = false; | |
a723baf1 | 9830 | } |
62b8a44e | 9831 | /* We're done. */ |
a723baf1 MM |
9832 | else |
9833 | break; | |
a723baf1 MM |
9834 | } |
9835 | ||
9836 | /* For an abstract declarator, we might wind up with nothing at this | |
9837 | point. That's an error; the declarator is not optional. */ | |
9838 | if (!declarator) | |
9839 | cp_parser_error (parser, "expected declarator"); | |
9840 | ||
9841 | /* If we entered a scope, we must exit it now. */ | |
9842 | if (scope) | |
9843 | pop_scope (scope); | |
9844 | ||
9845 | parser->default_arg_ok_p = saved_default_arg_ok_p; | |
9846 | parser->in_declarator_p = saved_in_declarator_p; | |
9847 | ||
9848 | return declarator; | |
9849 | } | |
9850 | ||
9851 | /* Parse a ptr-operator. | |
9852 | ||
9853 | ptr-operator: | |
9854 | * cv-qualifier-seq [opt] | |
9855 | & | |
9856 | :: [opt] nested-name-specifier * cv-qualifier-seq [opt] | |
9857 | ||
9858 | GNU Extension: | |
9859 | ||
9860 | ptr-operator: | |
9861 | & cv-qualifier-seq [opt] | |
9862 | ||
9863 | Returns INDIRECT_REF if a pointer, or pointer-to-member, was | |
9864 | used. Returns ADDR_EXPR if a reference was used. In the | |
9865 | case of a pointer-to-member, *TYPE is filled in with the | |
9866 | TYPE containing the member. *CV_QUALIFIER_SEQ is filled in | |
9867 | with the cv-qualifier-seq, or NULL_TREE, if there are no | |
9868 | cv-qualifiers. Returns ERROR_MARK if an error occurred. */ | |
9869 | ||
9870 | static enum tree_code | |
94edc4ab NN |
9871 | cp_parser_ptr_operator (cp_parser* parser, |
9872 | tree* type, | |
9873 | tree* cv_qualifier_seq) | |
a723baf1 MM |
9874 | { |
9875 | enum tree_code code = ERROR_MARK; | |
9876 | cp_token *token; | |
9877 | ||
9878 | /* Assume that it's not a pointer-to-member. */ | |
9879 | *type = NULL_TREE; | |
9880 | /* And that there are no cv-qualifiers. */ | |
9881 | *cv_qualifier_seq = NULL_TREE; | |
9882 | ||
9883 | /* Peek at the next token. */ | |
9884 | token = cp_lexer_peek_token (parser->lexer); | |
9885 | /* If it's a `*' or `&' we have a pointer or reference. */ | |
9886 | if (token->type == CPP_MULT || token->type == CPP_AND) | |
9887 | { | |
9888 | /* Remember which ptr-operator we were processing. */ | |
9889 | code = (token->type == CPP_AND ? ADDR_EXPR : INDIRECT_REF); | |
9890 | ||
9891 | /* Consume the `*' or `&'. */ | |
9892 | cp_lexer_consume_token (parser->lexer); | |
9893 | ||
9894 | /* A `*' can be followed by a cv-qualifier-seq, and so can a | |
9895 | `&', if we are allowing GNU extensions. (The only qualifier | |
9896 | that can legally appear after `&' is `restrict', but that is | |
9897 | enforced during semantic analysis. */ | |
9898 | if (code == INDIRECT_REF | |
9899 | || cp_parser_allow_gnu_extensions_p (parser)) | |
9900 | *cv_qualifier_seq = cp_parser_cv_qualifier_seq_opt (parser); | |
9901 | } | |
9902 | else | |
9903 | { | |
9904 | /* Try the pointer-to-member case. */ | |
9905 | cp_parser_parse_tentatively (parser); | |
9906 | /* Look for the optional `::' operator. */ | |
9907 | cp_parser_global_scope_opt (parser, | |
9908 | /*current_scope_valid_p=*/false); | |
9909 | /* Look for the nested-name specifier. */ | |
9910 | cp_parser_nested_name_specifier (parser, | |
9911 | /*typename_keyword_p=*/false, | |
9912 | /*check_dependency_p=*/true, | |
9913 | /*type_p=*/false); | |
9914 | /* If we found it, and the next token is a `*', then we are | |
9915 | indeed looking at a pointer-to-member operator. */ | |
9916 | if (!cp_parser_error_occurred (parser) | |
9917 | && cp_parser_require (parser, CPP_MULT, "`*'")) | |
9918 | { | |
9919 | /* The type of which the member is a member is given by the | |
9920 | current SCOPE. */ | |
9921 | *type = parser->scope; | |
9922 | /* The next name will not be qualified. */ | |
9923 | parser->scope = NULL_TREE; | |
9924 | parser->qualifying_scope = NULL_TREE; | |
9925 | parser->object_scope = NULL_TREE; | |
9926 | /* Indicate that the `*' operator was used. */ | |
9927 | code = INDIRECT_REF; | |
9928 | /* Look for the optional cv-qualifier-seq. */ | |
9929 | *cv_qualifier_seq = cp_parser_cv_qualifier_seq_opt (parser); | |
9930 | } | |
9931 | /* If that didn't work we don't have a ptr-operator. */ | |
9932 | if (!cp_parser_parse_definitely (parser)) | |
9933 | cp_parser_error (parser, "expected ptr-operator"); | |
9934 | } | |
9935 | ||
9936 | return code; | |
9937 | } | |
9938 | ||
9939 | /* Parse an (optional) cv-qualifier-seq. | |
9940 | ||
9941 | cv-qualifier-seq: | |
9942 | cv-qualifier cv-qualifier-seq [opt] | |
9943 | ||
9944 | Returns a TREE_LIST. The TREE_VALUE of each node is the | |
9945 | representation of a cv-qualifier. */ | |
9946 | ||
9947 | static tree | |
94edc4ab | 9948 | cp_parser_cv_qualifier_seq_opt (cp_parser* parser) |
a723baf1 MM |
9949 | { |
9950 | tree cv_qualifiers = NULL_TREE; | |
9951 | ||
9952 | while (true) | |
9953 | { | |
9954 | tree cv_qualifier; | |
9955 | ||
9956 | /* Look for the next cv-qualifier. */ | |
9957 | cv_qualifier = cp_parser_cv_qualifier_opt (parser); | |
9958 | /* If we didn't find one, we're done. */ | |
9959 | if (!cv_qualifier) | |
9960 | break; | |
9961 | ||
9962 | /* Add this cv-qualifier to the list. */ | |
9963 | cv_qualifiers | |
9964 | = tree_cons (NULL_TREE, cv_qualifier, cv_qualifiers); | |
9965 | } | |
9966 | ||
9967 | /* We built up the list in reverse order. */ | |
9968 | return nreverse (cv_qualifiers); | |
9969 | } | |
9970 | ||
9971 | /* Parse an (optional) cv-qualifier. | |
9972 | ||
9973 | cv-qualifier: | |
9974 | const | |
9975 | volatile | |
9976 | ||
9977 | GNU Extension: | |
9978 | ||
9979 | cv-qualifier: | |
9980 | __restrict__ */ | |
9981 | ||
9982 | static tree | |
94edc4ab | 9983 | cp_parser_cv_qualifier_opt (cp_parser* parser) |
a723baf1 MM |
9984 | { |
9985 | cp_token *token; | |
9986 | tree cv_qualifier = NULL_TREE; | |
9987 | ||
9988 | /* Peek at the next token. */ | |
9989 | token = cp_lexer_peek_token (parser->lexer); | |
9990 | /* See if it's a cv-qualifier. */ | |
9991 | switch (token->keyword) | |
9992 | { | |
9993 | case RID_CONST: | |
9994 | case RID_VOLATILE: | |
9995 | case RID_RESTRICT: | |
9996 | /* Save the value of the token. */ | |
9997 | cv_qualifier = token->value; | |
9998 | /* Consume the token. */ | |
9999 | cp_lexer_consume_token (parser->lexer); | |
10000 | break; | |
10001 | ||
10002 | default: | |
10003 | break; | |
10004 | } | |
10005 | ||
10006 | return cv_qualifier; | |
10007 | } | |
10008 | ||
10009 | /* Parse a declarator-id. | |
10010 | ||
10011 | declarator-id: | |
10012 | id-expression | |
10013 | :: [opt] nested-name-specifier [opt] type-name | |
10014 | ||
10015 | In the `id-expression' case, the value returned is as for | |
10016 | cp_parser_id_expression if the id-expression was an unqualified-id. | |
10017 | If the id-expression was a qualified-id, then a SCOPE_REF is | |
10018 | returned. The first operand is the scope (either a NAMESPACE_DECL | |
10019 | or TREE_TYPE), but the second is still just a representation of an | |
10020 | unqualified-id. */ | |
10021 | ||
10022 | static tree | |
94edc4ab | 10023 | cp_parser_declarator_id (cp_parser* parser) |
a723baf1 MM |
10024 | { |
10025 | tree id_expression; | |
10026 | ||
10027 | /* The expression must be an id-expression. Assume that qualified | |
10028 | names are the names of types so that: | |
10029 | ||
10030 | template <class T> | |
10031 | int S<T>::R::i = 3; | |
10032 | ||
10033 | will work; we must treat `S<T>::R' as the name of a type. | |
10034 | Similarly, assume that qualified names are templates, where | |
10035 | required, so that: | |
10036 | ||
10037 | template <class T> | |
10038 | int S<T>::R<T>::i = 3; | |
10039 | ||
10040 | will work, too. */ | |
10041 | id_expression = cp_parser_id_expression (parser, | |
10042 | /*template_keyword_p=*/false, | |
10043 | /*check_dependency_p=*/false, | |
10044 | /*template_p=*/NULL); | |
10045 | /* If the name was qualified, create a SCOPE_REF to represent | |
10046 | that. */ | |
10047 | if (parser->scope) | |
ec20aa6c MM |
10048 | { |
10049 | id_expression = build_nt (SCOPE_REF, parser->scope, id_expression); | |
10050 | parser->scope = NULL_TREE; | |
10051 | } | |
a723baf1 MM |
10052 | |
10053 | return id_expression; | |
10054 | } | |
10055 | ||
10056 | /* Parse a type-id. | |
10057 | ||
10058 | type-id: | |
10059 | type-specifier-seq abstract-declarator [opt] | |
10060 | ||
10061 | Returns the TYPE specified. */ | |
10062 | ||
10063 | static tree | |
94edc4ab | 10064 | cp_parser_type_id (cp_parser* parser) |
a723baf1 MM |
10065 | { |
10066 | tree type_specifier_seq; | |
10067 | tree abstract_declarator; | |
10068 | ||
10069 | /* Parse the type-specifier-seq. */ | |
10070 | type_specifier_seq | |
10071 | = cp_parser_type_specifier_seq (parser); | |
10072 | if (type_specifier_seq == error_mark_node) | |
10073 | return error_mark_node; | |
10074 | ||
10075 | /* There might or might not be an abstract declarator. */ | |
10076 | cp_parser_parse_tentatively (parser); | |
10077 | /* Look for the declarator. */ | |
10078 | abstract_declarator | |
62b8a44e | 10079 | = cp_parser_declarator (parser, CP_PARSER_DECLARATOR_ABSTRACT, NULL); |
a723baf1 MM |
10080 | /* Check to see if there really was a declarator. */ |
10081 | if (!cp_parser_parse_definitely (parser)) | |
10082 | abstract_declarator = NULL_TREE; | |
10083 | ||
10084 | return groktypename (build_tree_list (type_specifier_seq, | |
10085 | abstract_declarator)); | |
10086 | } | |
10087 | ||
10088 | /* Parse a type-specifier-seq. | |
10089 | ||
10090 | type-specifier-seq: | |
10091 | type-specifier type-specifier-seq [opt] | |
10092 | ||
10093 | GNU extension: | |
10094 | ||
10095 | type-specifier-seq: | |
10096 | attributes type-specifier-seq [opt] | |
10097 | ||
10098 | Returns a TREE_LIST. Either the TREE_VALUE of each node is a | |
10099 | type-specifier, or the TREE_PURPOSE is a list of attributes. */ | |
10100 | ||
10101 | static tree | |
94edc4ab | 10102 | cp_parser_type_specifier_seq (cp_parser* parser) |
a723baf1 MM |
10103 | { |
10104 | bool seen_type_specifier = false; | |
10105 | tree type_specifier_seq = NULL_TREE; | |
10106 | ||
10107 | /* Parse the type-specifiers and attributes. */ | |
10108 | while (true) | |
10109 | { | |
10110 | tree type_specifier; | |
10111 | ||
10112 | /* Check for attributes first. */ | |
10113 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_ATTRIBUTE)) | |
10114 | { | |
10115 | type_specifier_seq = tree_cons (cp_parser_attributes_opt (parser), | |
10116 | NULL_TREE, | |
10117 | type_specifier_seq); | |
10118 | continue; | |
10119 | } | |
10120 | ||
10121 | /* After the first type-specifier, others are optional. */ | |
10122 | if (seen_type_specifier) | |
10123 | cp_parser_parse_tentatively (parser); | |
10124 | /* Look for the type-specifier. */ | |
10125 | type_specifier = cp_parser_type_specifier (parser, | |
10126 | CP_PARSER_FLAGS_NONE, | |
10127 | /*is_friend=*/false, | |
10128 | /*is_declaration=*/false, | |
10129 | NULL, | |
10130 | NULL); | |
10131 | /* If the first type-specifier could not be found, this is not a | |
10132 | type-specifier-seq at all. */ | |
10133 | if (!seen_type_specifier && type_specifier == error_mark_node) | |
10134 | return error_mark_node; | |
10135 | /* If subsequent type-specifiers could not be found, the | |
10136 | type-specifier-seq is complete. */ | |
10137 | else if (seen_type_specifier && !cp_parser_parse_definitely (parser)) | |
10138 | break; | |
10139 | ||
10140 | /* Add the new type-specifier to the list. */ | |
10141 | type_specifier_seq | |
10142 | = tree_cons (NULL_TREE, type_specifier, type_specifier_seq); | |
10143 | seen_type_specifier = true; | |
10144 | } | |
10145 | ||
10146 | /* We built up the list in reverse order. */ | |
10147 | return nreverse (type_specifier_seq); | |
10148 | } | |
10149 | ||
10150 | /* Parse a parameter-declaration-clause. | |
10151 | ||
10152 | parameter-declaration-clause: | |
10153 | parameter-declaration-list [opt] ... [opt] | |
10154 | parameter-declaration-list , ... | |
10155 | ||
10156 | Returns a representation for the parameter declarations. Each node | |
10157 | is a TREE_LIST. (See cp_parser_parameter_declaration for the exact | |
10158 | representation.) If the parameter-declaration-clause ends with an | |
10159 | ellipsis, PARMLIST_ELLIPSIS_P will hold of the first node in the | |
10160 | list. A return value of NULL_TREE indicates a | |
10161 | parameter-declaration-clause consisting only of an ellipsis. */ | |
10162 | ||
10163 | static tree | |
94edc4ab | 10164 | cp_parser_parameter_declaration_clause (cp_parser* parser) |
a723baf1 MM |
10165 | { |
10166 | tree parameters; | |
10167 | cp_token *token; | |
10168 | bool ellipsis_p; | |
10169 | ||
10170 | /* Peek at the next token. */ | |
10171 | token = cp_lexer_peek_token (parser->lexer); | |
10172 | /* Check for trivial parameter-declaration-clauses. */ | |
10173 | if (token->type == CPP_ELLIPSIS) | |
10174 | { | |
10175 | /* Consume the `...' token. */ | |
10176 | cp_lexer_consume_token (parser->lexer); | |
10177 | return NULL_TREE; | |
10178 | } | |
10179 | else if (token->type == CPP_CLOSE_PAREN) | |
10180 | /* There are no parameters. */ | |
c73aecdf DE |
10181 | { |
10182 | #ifndef NO_IMPLICIT_EXTERN_C | |
10183 | if (in_system_header && current_class_type == NULL | |
10184 | && current_lang_name == lang_name_c) | |
10185 | return NULL_TREE; | |
10186 | else | |
10187 | #endif | |
10188 | return void_list_node; | |
10189 | } | |
a723baf1 MM |
10190 | /* Check for `(void)', too, which is a special case. */ |
10191 | else if (token->keyword == RID_VOID | |
10192 | && (cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
10193 | == CPP_CLOSE_PAREN)) | |
10194 | { | |
10195 | /* Consume the `void' token. */ | |
10196 | cp_lexer_consume_token (parser->lexer); | |
10197 | /* There are no parameters. */ | |
10198 | return void_list_node; | |
10199 | } | |
10200 | ||
10201 | /* Parse the parameter-declaration-list. */ | |
10202 | parameters = cp_parser_parameter_declaration_list (parser); | |
10203 | /* If a parse error occurred while parsing the | |
10204 | parameter-declaration-list, then the entire | |
10205 | parameter-declaration-clause is erroneous. */ | |
10206 | if (parameters == error_mark_node) | |
10207 | return error_mark_node; | |
10208 | ||
10209 | /* Peek at the next token. */ | |
10210 | token = cp_lexer_peek_token (parser->lexer); | |
10211 | /* If it's a `,', the clause should terminate with an ellipsis. */ | |
10212 | if (token->type == CPP_COMMA) | |
10213 | { | |
10214 | /* Consume the `,'. */ | |
10215 | cp_lexer_consume_token (parser->lexer); | |
10216 | /* Expect an ellipsis. */ | |
10217 | ellipsis_p | |
10218 | = (cp_parser_require (parser, CPP_ELLIPSIS, "`...'") != NULL); | |
10219 | } | |
10220 | /* It might also be `...' if the optional trailing `,' was | |
10221 | omitted. */ | |
10222 | else if (token->type == CPP_ELLIPSIS) | |
10223 | { | |
10224 | /* Consume the `...' token. */ | |
10225 | cp_lexer_consume_token (parser->lexer); | |
10226 | /* And remember that we saw it. */ | |
10227 | ellipsis_p = true; | |
10228 | } | |
10229 | else | |
10230 | ellipsis_p = false; | |
10231 | ||
10232 | /* Finish the parameter list. */ | |
10233 | return finish_parmlist (parameters, ellipsis_p); | |
10234 | } | |
10235 | ||
10236 | /* Parse a parameter-declaration-list. | |
10237 | ||
10238 | parameter-declaration-list: | |
10239 | parameter-declaration | |
10240 | parameter-declaration-list , parameter-declaration | |
10241 | ||
10242 | Returns a representation of the parameter-declaration-list, as for | |
10243 | cp_parser_parameter_declaration_clause. However, the | |
10244 | `void_list_node' is never appended to the list. */ | |
10245 | ||
10246 | static tree | |
94edc4ab | 10247 | cp_parser_parameter_declaration_list (cp_parser* parser) |
a723baf1 MM |
10248 | { |
10249 | tree parameters = NULL_TREE; | |
10250 | ||
10251 | /* Look for more parameters. */ | |
10252 | while (true) | |
10253 | { | |
10254 | tree parameter; | |
10255 | /* Parse the parameter. */ | |
10256 | parameter | |
ec194454 MM |
10257 | = cp_parser_parameter_declaration (parser, /*template_parm_p=*/false); |
10258 | ||
34cd5ae7 | 10259 | /* If a parse error occurred parsing the parameter declaration, |
a723baf1 MM |
10260 | then the entire parameter-declaration-list is erroneous. */ |
10261 | if (parameter == error_mark_node) | |
10262 | { | |
10263 | parameters = error_mark_node; | |
10264 | break; | |
10265 | } | |
10266 | /* Add the new parameter to the list. */ | |
10267 | TREE_CHAIN (parameter) = parameters; | |
10268 | parameters = parameter; | |
10269 | ||
10270 | /* Peek at the next token. */ | |
10271 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_PAREN) | |
10272 | || cp_lexer_next_token_is (parser->lexer, CPP_ELLIPSIS)) | |
10273 | /* The parameter-declaration-list is complete. */ | |
10274 | break; | |
10275 | else if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
10276 | { | |
10277 | cp_token *token; | |
10278 | ||
10279 | /* Peek at the next token. */ | |
10280 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
10281 | /* If it's an ellipsis, then the list is complete. */ | |
10282 | if (token->type == CPP_ELLIPSIS) | |
10283 | break; | |
10284 | /* Otherwise, there must be more parameters. Consume the | |
10285 | `,'. */ | |
10286 | cp_lexer_consume_token (parser->lexer); | |
10287 | } | |
10288 | else | |
10289 | { | |
10290 | cp_parser_error (parser, "expected `,' or `...'"); | |
10291 | break; | |
10292 | } | |
10293 | } | |
10294 | ||
10295 | /* We built up the list in reverse order; straighten it out now. */ | |
10296 | return nreverse (parameters); | |
10297 | } | |
10298 | ||
10299 | /* Parse a parameter declaration. | |
10300 | ||
10301 | parameter-declaration: | |
10302 | decl-specifier-seq declarator | |
10303 | decl-specifier-seq declarator = assignment-expression | |
10304 | decl-specifier-seq abstract-declarator [opt] | |
10305 | decl-specifier-seq abstract-declarator [opt] = assignment-expression | |
10306 | ||
ec194454 MM |
10307 | If TEMPLATE_PARM_P is TRUE, then this parameter-declaration |
10308 | declares a template parameter. (In that case, a non-nested `>' | |
10309 | token encountered during the parsing of the assignment-expression | |
10310 | is not interpreted as a greater-than operator.) | |
a723baf1 MM |
10311 | |
10312 | Returns a TREE_LIST representing the parameter-declaration. The | |
10313 | TREE_VALUE is a representation of the decl-specifier-seq and | |
10314 | declarator. In particular, the TREE_VALUE will be a TREE_LIST | |
10315 | whose TREE_PURPOSE represents the decl-specifier-seq and whose | |
10316 | TREE_VALUE represents the declarator. */ | |
10317 | ||
10318 | static tree | |
ec194454 MM |
10319 | cp_parser_parameter_declaration (cp_parser *parser, |
10320 | bool template_parm_p) | |
a723baf1 MM |
10321 | { |
10322 | bool declares_class_or_enum; | |
ec194454 | 10323 | bool greater_than_is_operator_p; |
a723baf1 MM |
10324 | tree decl_specifiers; |
10325 | tree attributes; | |
10326 | tree declarator; | |
10327 | tree default_argument; | |
10328 | tree parameter; | |
10329 | cp_token *token; | |
10330 | const char *saved_message; | |
10331 | ||
ec194454 MM |
10332 | /* In a template parameter, `>' is not an operator. |
10333 | ||
10334 | [temp.param] | |
10335 | ||
10336 | When parsing a default template-argument for a non-type | |
10337 | template-parameter, the first non-nested `>' is taken as the end | |
10338 | of the template parameter-list rather than a greater-than | |
10339 | operator. */ | |
10340 | greater_than_is_operator_p = !template_parm_p; | |
10341 | ||
a723baf1 MM |
10342 | /* Type definitions may not appear in parameter types. */ |
10343 | saved_message = parser->type_definition_forbidden_message; | |
10344 | parser->type_definition_forbidden_message | |
10345 | = "types may not be defined in parameter types"; | |
10346 | ||
10347 | /* Parse the declaration-specifiers. */ | |
10348 | decl_specifiers | |
10349 | = cp_parser_decl_specifier_seq (parser, | |
10350 | CP_PARSER_FLAGS_NONE, | |
10351 | &attributes, | |
10352 | &declares_class_or_enum); | |
10353 | /* If an error occurred, there's no reason to attempt to parse the | |
10354 | rest of the declaration. */ | |
10355 | if (cp_parser_error_occurred (parser)) | |
10356 | { | |
10357 | parser->type_definition_forbidden_message = saved_message; | |
10358 | return error_mark_node; | |
10359 | } | |
10360 | ||
10361 | /* Peek at the next token. */ | |
10362 | token = cp_lexer_peek_token (parser->lexer); | |
10363 | /* If the next token is a `)', `,', `=', `>', or `...', then there | |
10364 | is no declarator. */ | |
10365 | if (token->type == CPP_CLOSE_PAREN | |
10366 | || token->type == CPP_COMMA | |
10367 | || token->type == CPP_EQ | |
10368 | || token->type == CPP_ELLIPSIS | |
10369 | || token->type == CPP_GREATER) | |
10370 | declarator = NULL_TREE; | |
10371 | /* Otherwise, there should be a declarator. */ | |
10372 | else | |
10373 | { | |
10374 | bool saved_default_arg_ok_p = parser->default_arg_ok_p; | |
10375 | parser->default_arg_ok_p = false; | |
10376 | ||
a723baf1 | 10377 | declarator = cp_parser_declarator (parser, |
62b8a44e | 10378 | CP_PARSER_DECLARATOR_EITHER, |
a723baf1 | 10379 | /*ctor_dtor_or_conv_p=*/NULL); |
a723baf1 | 10380 | parser->default_arg_ok_p = saved_default_arg_ok_p; |
4971227d MM |
10381 | /* After the declarator, allow more attributes. */ |
10382 | attributes = chainon (attributes, cp_parser_attributes_opt (parser)); | |
a723baf1 MM |
10383 | } |
10384 | ||
62b8a44e | 10385 | /* The restriction on defining new types applies only to the type |
a723baf1 MM |
10386 | of the parameter, not to the default argument. */ |
10387 | parser->type_definition_forbidden_message = saved_message; | |
10388 | ||
10389 | /* If the next token is `=', then process a default argument. */ | |
10390 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
10391 | { | |
10392 | bool saved_greater_than_is_operator_p; | |
10393 | /* Consume the `='. */ | |
10394 | cp_lexer_consume_token (parser->lexer); | |
10395 | ||
10396 | /* If we are defining a class, then the tokens that make up the | |
10397 | default argument must be saved and processed later. */ | |
ec194454 MM |
10398 | if (!template_parm_p && at_class_scope_p () |
10399 | && TYPE_BEING_DEFINED (current_class_type)) | |
a723baf1 MM |
10400 | { |
10401 | unsigned depth = 0; | |
10402 | ||
10403 | /* Create a DEFAULT_ARG to represented the unparsed default | |
10404 | argument. */ | |
10405 | default_argument = make_node (DEFAULT_ARG); | |
10406 | DEFARG_TOKENS (default_argument) = cp_token_cache_new (); | |
10407 | ||
10408 | /* Add tokens until we have processed the entire default | |
10409 | argument. */ | |
10410 | while (true) | |
10411 | { | |
10412 | bool done = false; | |
10413 | cp_token *token; | |
10414 | ||
10415 | /* Peek at the next token. */ | |
10416 | token = cp_lexer_peek_token (parser->lexer); | |
10417 | /* What we do depends on what token we have. */ | |
10418 | switch (token->type) | |
10419 | { | |
10420 | /* In valid code, a default argument must be | |
10421 | immediately followed by a `,' `)', or `...'. */ | |
10422 | case CPP_COMMA: | |
10423 | case CPP_CLOSE_PAREN: | |
10424 | case CPP_ELLIPSIS: | |
10425 | /* If we run into a non-nested `;', `}', or `]', | |
10426 | then the code is invalid -- but the default | |
10427 | argument is certainly over. */ | |
10428 | case CPP_SEMICOLON: | |
10429 | case CPP_CLOSE_BRACE: | |
10430 | case CPP_CLOSE_SQUARE: | |
10431 | if (depth == 0) | |
10432 | done = true; | |
10433 | /* Update DEPTH, if necessary. */ | |
10434 | else if (token->type == CPP_CLOSE_PAREN | |
10435 | || token->type == CPP_CLOSE_BRACE | |
10436 | || token->type == CPP_CLOSE_SQUARE) | |
10437 | --depth; | |
10438 | break; | |
10439 | ||
10440 | case CPP_OPEN_PAREN: | |
10441 | case CPP_OPEN_SQUARE: | |
10442 | case CPP_OPEN_BRACE: | |
10443 | ++depth; | |
10444 | break; | |
10445 | ||
10446 | case CPP_GREATER: | |
10447 | /* If we see a non-nested `>', and `>' is not an | |
10448 | operator, then it marks the end of the default | |
10449 | argument. */ | |
10450 | if (!depth && !greater_than_is_operator_p) | |
10451 | done = true; | |
10452 | break; | |
10453 | ||
10454 | /* If we run out of tokens, issue an error message. */ | |
10455 | case CPP_EOF: | |
10456 | error ("file ends in default argument"); | |
10457 | done = true; | |
10458 | break; | |
10459 | ||
10460 | case CPP_NAME: | |
10461 | case CPP_SCOPE: | |
10462 | /* In these cases, we should look for template-ids. | |
10463 | For example, if the default argument is | |
10464 | `X<int, double>()', we need to do name lookup to | |
10465 | figure out whether or not `X' is a template; if | |
34cd5ae7 | 10466 | so, the `,' does not end the default argument. |
a723baf1 MM |
10467 | |
10468 | That is not yet done. */ | |
10469 | break; | |
10470 | ||
10471 | default: | |
10472 | break; | |
10473 | } | |
10474 | ||
10475 | /* If we've reached the end, stop. */ | |
10476 | if (done) | |
10477 | break; | |
10478 | ||
10479 | /* Add the token to the token block. */ | |
10480 | token = cp_lexer_consume_token (parser->lexer); | |
10481 | cp_token_cache_push_token (DEFARG_TOKENS (default_argument), | |
10482 | token); | |
10483 | } | |
10484 | } | |
10485 | /* Outside of a class definition, we can just parse the | |
10486 | assignment-expression. */ | |
10487 | else | |
10488 | { | |
10489 | bool saved_local_variables_forbidden_p; | |
10490 | ||
10491 | /* Make sure that PARSER->GREATER_THAN_IS_OPERATOR_P is | |
10492 | set correctly. */ | |
10493 | saved_greater_than_is_operator_p | |
10494 | = parser->greater_than_is_operator_p; | |
10495 | parser->greater_than_is_operator_p = greater_than_is_operator_p; | |
10496 | /* Local variable names (and the `this' keyword) may not | |
10497 | appear in a default argument. */ | |
10498 | saved_local_variables_forbidden_p | |
10499 | = parser->local_variables_forbidden_p; | |
10500 | parser->local_variables_forbidden_p = true; | |
10501 | /* Parse the assignment-expression. */ | |
10502 | default_argument = cp_parser_assignment_expression (parser); | |
10503 | /* Restore saved state. */ | |
10504 | parser->greater_than_is_operator_p | |
10505 | = saved_greater_than_is_operator_p; | |
10506 | parser->local_variables_forbidden_p | |
10507 | = saved_local_variables_forbidden_p; | |
10508 | } | |
10509 | if (!parser->default_arg_ok_p) | |
10510 | { | |
10511 | pedwarn ("default arguments are only permitted on functions"); | |
10512 | if (flag_pedantic_errors) | |
10513 | default_argument = NULL_TREE; | |
10514 | } | |
10515 | } | |
10516 | else | |
10517 | default_argument = NULL_TREE; | |
10518 | ||
10519 | /* Create the representation of the parameter. */ | |
10520 | if (attributes) | |
10521 | decl_specifiers = tree_cons (attributes, NULL_TREE, decl_specifiers); | |
10522 | parameter = build_tree_list (default_argument, | |
10523 | build_tree_list (decl_specifiers, | |
10524 | declarator)); | |
10525 | ||
10526 | return parameter; | |
10527 | } | |
10528 | ||
10529 | /* Parse a function-definition. | |
10530 | ||
10531 | function-definition: | |
10532 | decl-specifier-seq [opt] declarator ctor-initializer [opt] | |
10533 | function-body | |
10534 | decl-specifier-seq [opt] declarator function-try-block | |
10535 | ||
10536 | GNU Extension: | |
10537 | ||
10538 | function-definition: | |
10539 | __extension__ function-definition | |
10540 | ||
10541 | Returns the FUNCTION_DECL for the function. If FRIEND_P is | |
10542 | non-NULL, *FRIEND_P is set to TRUE iff the function was declared to | |
10543 | be a `friend'. */ | |
10544 | ||
10545 | static tree | |
94edc4ab | 10546 | cp_parser_function_definition (cp_parser* parser, bool* friend_p) |
a723baf1 MM |
10547 | { |
10548 | tree decl_specifiers; | |
10549 | tree attributes; | |
10550 | tree declarator; | |
10551 | tree fn; | |
a723baf1 MM |
10552 | cp_token *token; |
10553 | bool declares_class_or_enum; | |
10554 | bool member_p; | |
10555 | /* The saved value of the PEDANTIC flag. */ | |
10556 | int saved_pedantic; | |
10557 | ||
10558 | /* Any pending qualification must be cleared by our caller. It is | |
10559 | more robust to force the callers to clear PARSER->SCOPE than to | |
10560 | do it here since if the qualification is in effect here, it might | |
10561 | also end up in effect elsewhere that it is not intended. */ | |
10562 | my_friendly_assert (!parser->scope, 20010821); | |
10563 | ||
10564 | /* Handle `__extension__'. */ | |
10565 | if (cp_parser_extension_opt (parser, &saved_pedantic)) | |
10566 | { | |
10567 | /* Parse the function-definition. */ | |
10568 | fn = cp_parser_function_definition (parser, friend_p); | |
10569 | /* Restore the PEDANTIC flag. */ | |
10570 | pedantic = saved_pedantic; | |
10571 | ||
10572 | return fn; | |
10573 | } | |
10574 | ||
10575 | /* Check to see if this definition appears in a class-specifier. */ | |
10576 | member_p = (at_class_scope_p () | |
10577 | && TYPE_BEING_DEFINED (current_class_type)); | |
10578 | /* Defer access checks in the decl-specifier-seq until we know what | |
10579 | function is being defined. There is no need to do this for the | |
10580 | definition of member functions; we cannot be defining a member | |
10581 | from another class. */ | |
8d241e0b | 10582 | push_deferring_access_checks (member_p ? dk_no_check: dk_deferred); |
cf22909c | 10583 | |
a723baf1 MM |
10584 | /* Parse the decl-specifier-seq. */ |
10585 | decl_specifiers | |
10586 | = cp_parser_decl_specifier_seq (parser, | |
10587 | CP_PARSER_FLAGS_OPTIONAL, | |
10588 | &attributes, | |
10589 | &declares_class_or_enum); | |
10590 | /* Figure out whether this declaration is a `friend'. */ | |
10591 | if (friend_p) | |
10592 | *friend_p = cp_parser_friend_p (decl_specifiers); | |
10593 | ||
10594 | /* Parse the declarator. */ | |
62b8a44e | 10595 | declarator = cp_parser_declarator (parser, CP_PARSER_DECLARATOR_NAMED, |
a723baf1 MM |
10596 | /*ctor_dtor_or_conv_p=*/NULL); |
10597 | ||
10598 | /* Gather up any access checks that occurred. */ | |
cf22909c | 10599 | stop_deferring_access_checks (); |
a723baf1 MM |
10600 | |
10601 | /* If something has already gone wrong, we may as well stop now. */ | |
10602 | if (declarator == error_mark_node) | |
10603 | { | |
10604 | /* Skip to the end of the function, or if this wasn't anything | |
10605 | like a function-definition, to a `;' in the hopes of finding | |
10606 | a sensible place from which to continue parsing. */ | |
10607 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
cf22909c | 10608 | pop_deferring_access_checks (); |
a723baf1 MM |
10609 | return error_mark_node; |
10610 | } | |
10611 | ||
10612 | /* The next character should be a `{' (for a simple function | |
10613 | definition), a `:' (for a ctor-initializer), or `try' (for a | |
10614 | function-try block). */ | |
10615 | token = cp_lexer_peek_token (parser->lexer); | |
10616 | if (!cp_parser_token_starts_function_definition_p (token)) | |
10617 | { | |
10618 | /* Issue the error-message. */ | |
10619 | cp_parser_error (parser, "expected function-definition"); | |
10620 | /* Skip to the next `;'. */ | |
10621 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
10622 | ||
cf22909c | 10623 | pop_deferring_access_checks (); |
a723baf1 MM |
10624 | return error_mark_node; |
10625 | } | |
10626 | ||
10627 | /* If we are in a class scope, then we must handle | |
10628 | function-definitions specially. In particular, we save away the | |
10629 | tokens that make up the function body, and parse them again | |
10630 | later, in order to handle code like: | |
10631 | ||
10632 | struct S { | |
10633 | int f () { return i; } | |
10634 | int i; | |
10635 | }; | |
10636 | ||
10637 | Here, we cannot parse the body of `f' until after we have seen | |
10638 | the declaration of `i'. */ | |
10639 | if (member_p) | |
10640 | { | |
10641 | cp_token_cache *cache; | |
10642 | ||
10643 | /* Create the function-declaration. */ | |
10644 | fn = start_method (decl_specifiers, declarator, attributes); | |
10645 | /* If something went badly wrong, bail out now. */ | |
10646 | if (fn == error_mark_node) | |
10647 | { | |
10648 | /* If there's a function-body, skip it. */ | |
10649 | if (cp_parser_token_starts_function_definition_p | |
10650 | (cp_lexer_peek_token (parser->lexer))) | |
10651 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
cf22909c | 10652 | pop_deferring_access_checks (); |
a723baf1 MM |
10653 | return error_mark_node; |
10654 | } | |
10655 | ||
8db1028e NS |
10656 | /* Remember it, if there default args to post process. */ |
10657 | cp_parser_save_default_args (parser, fn); | |
10658 | ||
a723baf1 MM |
10659 | /* Create a token cache. */ |
10660 | cache = cp_token_cache_new (); | |
10661 | /* Save away the tokens that make up the body of the | |
10662 | function. */ | |
10663 | cp_parser_cache_group (parser, cache, CPP_CLOSE_BRACE, /*depth=*/0); | |
10664 | /* Handle function try blocks. */ | |
10665 | while (cp_lexer_next_token_is_keyword (parser->lexer, RID_CATCH)) | |
10666 | cp_parser_cache_group (parser, cache, CPP_CLOSE_BRACE, /*depth=*/0); | |
10667 | ||
10668 | /* Save away the inline definition; we will process it when the | |
10669 | class is complete. */ | |
10670 | DECL_PENDING_INLINE_INFO (fn) = cache; | |
10671 | DECL_PENDING_INLINE_P (fn) = 1; | |
10672 | ||
649fc72d NS |
10673 | /* We need to know that this was defined in the class, so that |
10674 | friend templates are handled correctly. */ | |
10675 | DECL_INITIALIZED_IN_CLASS_P (fn) = 1; | |
10676 | ||
a723baf1 MM |
10677 | /* We're done with the inline definition. */ |
10678 | finish_method (fn); | |
10679 | ||
10680 | /* Add FN to the queue of functions to be parsed later. */ | |
10681 | TREE_VALUE (parser->unparsed_functions_queues) | |
8218bd34 | 10682 | = tree_cons (NULL_TREE, fn, |
a723baf1 MM |
10683 | TREE_VALUE (parser->unparsed_functions_queues)); |
10684 | ||
cf22909c | 10685 | pop_deferring_access_checks (); |
a723baf1 MM |
10686 | return fn; |
10687 | } | |
10688 | ||
10689 | /* Check that the number of template-parameter-lists is OK. */ | |
10690 | if (!cp_parser_check_declarator_template_parameters (parser, | |
10691 | declarator)) | |
10692 | { | |
10693 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
cf22909c | 10694 | pop_deferring_access_checks (); |
a723baf1 MM |
10695 | return error_mark_node; |
10696 | } | |
10697 | ||
cf22909c KL |
10698 | fn = cp_parser_function_definition_from_specifiers_and_declarator |
10699 | (parser, decl_specifiers, attributes, declarator); | |
10700 | pop_deferring_access_checks (); | |
10701 | return fn; | |
a723baf1 MM |
10702 | } |
10703 | ||
10704 | /* Parse a function-body. | |
10705 | ||
10706 | function-body: | |
10707 | compound_statement */ | |
10708 | ||
10709 | static void | |
10710 | cp_parser_function_body (cp_parser *parser) | |
10711 | { | |
10712 | cp_parser_compound_statement (parser); | |
10713 | } | |
10714 | ||
10715 | /* Parse a ctor-initializer-opt followed by a function-body. Return | |
10716 | true if a ctor-initializer was present. */ | |
10717 | ||
10718 | static bool | |
10719 | cp_parser_ctor_initializer_opt_and_function_body (cp_parser *parser) | |
10720 | { | |
10721 | tree body; | |
10722 | bool ctor_initializer_p; | |
10723 | ||
10724 | /* Begin the function body. */ | |
10725 | body = begin_function_body (); | |
10726 | /* Parse the optional ctor-initializer. */ | |
10727 | ctor_initializer_p = cp_parser_ctor_initializer_opt (parser); | |
10728 | /* Parse the function-body. */ | |
10729 | cp_parser_function_body (parser); | |
10730 | /* Finish the function body. */ | |
10731 | finish_function_body (body); | |
10732 | ||
10733 | return ctor_initializer_p; | |
10734 | } | |
10735 | ||
10736 | /* Parse an initializer. | |
10737 | ||
10738 | initializer: | |
10739 | = initializer-clause | |
10740 | ( expression-list ) | |
10741 | ||
10742 | Returns a expression representing the initializer. If no | |
10743 | initializer is present, NULL_TREE is returned. | |
10744 | ||
10745 | *IS_PARENTHESIZED_INIT is set to TRUE if the `( expression-list )' | |
10746 | production is used, and zero otherwise. *IS_PARENTHESIZED_INIT is | |
39703eb9 MM |
10747 | set to FALSE if there is no initializer present. If there is an |
10748 | initializer, and it is not a constant-expression, *NON_CONSTANT_P | |
10749 | is set to true; otherwise it is set to false. */ | |
a723baf1 MM |
10750 | |
10751 | static tree | |
39703eb9 MM |
10752 | cp_parser_initializer (cp_parser* parser, bool* is_parenthesized_init, |
10753 | bool* non_constant_p) | |
a723baf1 MM |
10754 | { |
10755 | cp_token *token; | |
10756 | tree init; | |
10757 | ||
10758 | /* Peek at the next token. */ | |
10759 | token = cp_lexer_peek_token (parser->lexer); | |
10760 | ||
10761 | /* Let our caller know whether or not this initializer was | |
10762 | parenthesized. */ | |
10763 | *is_parenthesized_init = (token->type == CPP_OPEN_PAREN); | |
39703eb9 MM |
10764 | /* Assume that the initializer is constant. */ |
10765 | *non_constant_p = false; | |
a723baf1 MM |
10766 | |
10767 | if (token->type == CPP_EQ) | |
10768 | { | |
10769 | /* Consume the `='. */ | |
10770 | cp_lexer_consume_token (parser->lexer); | |
10771 | /* Parse the initializer-clause. */ | |
39703eb9 | 10772 | init = cp_parser_initializer_clause (parser, non_constant_p); |
a723baf1 MM |
10773 | } |
10774 | else if (token->type == CPP_OPEN_PAREN) | |
39703eb9 MM |
10775 | init = cp_parser_parenthesized_expression_list (parser, false, |
10776 | non_constant_p); | |
a723baf1 MM |
10777 | else |
10778 | { | |
10779 | /* Anything else is an error. */ | |
10780 | cp_parser_error (parser, "expected initializer"); | |
10781 | init = error_mark_node; | |
10782 | } | |
10783 | ||
10784 | return init; | |
10785 | } | |
10786 | ||
10787 | /* Parse an initializer-clause. | |
10788 | ||
10789 | initializer-clause: | |
10790 | assignment-expression | |
10791 | { initializer-list , [opt] } | |
10792 | { } | |
10793 | ||
10794 | Returns an expression representing the initializer. | |
10795 | ||
10796 | If the `assignment-expression' production is used the value | |
34cd5ae7 | 10797 | returned is simply a representation for the expression. |
a723baf1 MM |
10798 | |
10799 | Otherwise, a CONSTRUCTOR is returned. The CONSTRUCTOR_ELTS will be | |
10800 | the elements of the initializer-list (or NULL_TREE, if the last | |
10801 | production is used). The TREE_TYPE for the CONSTRUCTOR will be | |
10802 | NULL_TREE. There is no way to detect whether or not the optional | |
39703eb9 MM |
10803 | trailing `,' was provided. NON_CONSTANT_P is as for |
10804 | cp_parser_initializer. */ | |
a723baf1 MM |
10805 | |
10806 | static tree | |
39703eb9 | 10807 | cp_parser_initializer_clause (cp_parser* parser, bool* non_constant_p) |
a723baf1 MM |
10808 | { |
10809 | tree initializer; | |
10810 | ||
10811 | /* If it is not a `{', then we are looking at an | |
10812 | assignment-expression. */ | |
10813 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_BRACE)) | |
39703eb9 MM |
10814 | initializer |
10815 | = cp_parser_constant_expression (parser, | |
10816 | /*allow_non_constant_p=*/true, | |
10817 | non_constant_p); | |
a723baf1 MM |
10818 | else |
10819 | { | |
10820 | /* Consume the `{' token. */ | |
10821 | cp_lexer_consume_token (parser->lexer); | |
10822 | /* Create a CONSTRUCTOR to represent the braced-initializer. */ | |
10823 | initializer = make_node (CONSTRUCTOR); | |
10824 | /* Mark it with TREE_HAS_CONSTRUCTOR. This should not be | |
10825 | necessary, but check_initializer depends upon it, for | |
10826 | now. */ | |
10827 | TREE_HAS_CONSTRUCTOR (initializer) = 1; | |
10828 | /* If it's not a `}', then there is a non-trivial initializer. */ | |
10829 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_BRACE)) | |
10830 | { | |
10831 | /* Parse the initializer list. */ | |
10832 | CONSTRUCTOR_ELTS (initializer) | |
39703eb9 | 10833 | = cp_parser_initializer_list (parser, non_constant_p); |
a723baf1 MM |
10834 | /* A trailing `,' token is allowed. */ |
10835 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
10836 | cp_lexer_consume_token (parser->lexer); | |
10837 | } | |
a723baf1 MM |
10838 | /* Now, there should be a trailing `}'. */ |
10839 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
10840 | } | |
10841 | ||
10842 | return initializer; | |
10843 | } | |
10844 | ||
10845 | /* Parse an initializer-list. | |
10846 | ||
10847 | initializer-list: | |
10848 | initializer-clause | |
10849 | initializer-list , initializer-clause | |
10850 | ||
10851 | GNU Extension: | |
10852 | ||
10853 | initializer-list: | |
10854 | identifier : initializer-clause | |
10855 | initializer-list, identifier : initializer-clause | |
10856 | ||
10857 | Returns a TREE_LIST. The TREE_VALUE of each node is an expression | |
10858 | for the initializer. If the TREE_PURPOSE is non-NULL, it is the | |
39703eb9 MM |
10859 | IDENTIFIER_NODE naming the field to initialize. NON_CONSTANT_P is |
10860 | as for cp_parser_initializer. */ | |
a723baf1 MM |
10861 | |
10862 | static tree | |
39703eb9 | 10863 | cp_parser_initializer_list (cp_parser* parser, bool* non_constant_p) |
a723baf1 MM |
10864 | { |
10865 | tree initializers = NULL_TREE; | |
10866 | ||
39703eb9 MM |
10867 | /* Assume all of the expressions are constant. */ |
10868 | *non_constant_p = false; | |
10869 | ||
a723baf1 MM |
10870 | /* Parse the rest of the list. */ |
10871 | while (true) | |
10872 | { | |
10873 | cp_token *token; | |
10874 | tree identifier; | |
10875 | tree initializer; | |
39703eb9 MM |
10876 | bool clause_non_constant_p; |
10877 | ||
a723baf1 MM |
10878 | /* If the next token is an identifier and the following one is a |
10879 | colon, we are looking at the GNU designated-initializer | |
10880 | syntax. */ | |
10881 | if (cp_parser_allow_gnu_extensions_p (parser) | |
10882 | && cp_lexer_next_token_is (parser->lexer, CPP_NAME) | |
10883 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type == CPP_COLON) | |
10884 | { | |
10885 | /* Consume the identifier. */ | |
10886 | identifier = cp_lexer_consume_token (parser->lexer)->value; | |
10887 | /* Consume the `:'. */ | |
10888 | cp_lexer_consume_token (parser->lexer); | |
10889 | } | |
10890 | else | |
10891 | identifier = NULL_TREE; | |
10892 | ||
10893 | /* Parse the initializer. */ | |
39703eb9 MM |
10894 | initializer = cp_parser_initializer_clause (parser, |
10895 | &clause_non_constant_p); | |
10896 | /* If any clause is non-constant, so is the entire initializer. */ | |
10897 | if (clause_non_constant_p) | |
10898 | *non_constant_p = true; | |
a723baf1 MM |
10899 | /* Add it to the list. */ |
10900 | initializers = tree_cons (identifier, initializer, initializers); | |
10901 | ||
10902 | /* If the next token is not a comma, we have reached the end of | |
10903 | the list. */ | |
10904 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
10905 | break; | |
10906 | ||
10907 | /* Peek at the next token. */ | |
10908 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
10909 | /* If the next token is a `}', then we're still done. An | |
10910 | initializer-clause can have a trailing `,' after the | |
10911 | initializer-list and before the closing `}'. */ | |
10912 | if (token->type == CPP_CLOSE_BRACE) | |
10913 | break; | |
10914 | ||
10915 | /* Consume the `,' token. */ | |
10916 | cp_lexer_consume_token (parser->lexer); | |
10917 | } | |
10918 | ||
10919 | /* The initializers were built up in reverse order, so we need to | |
10920 | reverse them now. */ | |
10921 | return nreverse (initializers); | |
10922 | } | |
10923 | ||
10924 | /* Classes [gram.class] */ | |
10925 | ||
10926 | /* Parse a class-name. | |
10927 | ||
10928 | class-name: | |
10929 | identifier | |
10930 | template-id | |
10931 | ||
10932 | TYPENAME_KEYWORD_P is true iff the `typename' keyword has been used | |
10933 | to indicate that names looked up in dependent types should be | |
10934 | assumed to be types. TEMPLATE_KEYWORD_P is true iff the `template' | |
10935 | keyword has been used to indicate that the name that appears next | |
10936 | is a template. TYPE_P is true iff the next name should be treated | |
10937 | as class-name, even if it is declared to be some other kind of name | |
8d241e0b KL |
10938 | as well. If CHECK_DEPENDENCY_P is FALSE, names are looked up in |
10939 | dependent scopes. If CLASS_HEAD_P is TRUE, this class is the class | |
10940 | being defined in a class-head. | |
a723baf1 MM |
10941 | |
10942 | Returns the TYPE_DECL representing the class. */ | |
10943 | ||
10944 | static tree | |
10945 | cp_parser_class_name (cp_parser *parser, | |
10946 | bool typename_keyword_p, | |
10947 | bool template_keyword_p, | |
10948 | bool type_p, | |
a723baf1 MM |
10949 | bool check_dependency_p, |
10950 | bool class_head_p) | |
10951 | { | |
10952 | tree decl; | |
10953 | tree scope; | |
10954 | bool typename_p; | |
e5976695 MM |
10955 | cp_token *token; |
10956 | ||
10957 | /* All class-names start with an identifier. */ | |
10958 | token = cp_lexer_peek_token (parser->lexer); | |
10959 | if (token->type != CPP_NAME && token->type != CPP_TEMPLATE_ID) | |
10960 | { | |
10961 | cp_parser_error (parser, "expected class-name"); | |
10962 | return error_mark_node; | |
10963 | } | |
10964 | ||
a723baf1 MM |
10965 | /* PARSER->SCOPE can be cleared when parsing the template-arguments |
10966 | to a template-id, so we save it here. */ | |
10967 | scope = parser->scope; | |
10968 | /* Any name names a type if we're following the `typename' keyword | |
10969 | in a qualified name where the enclosing scope is type-dependent. */ | |
10970 | typename_p = (typename_keyword_p && scope && TYPE_P (scope) | |
1fb3244a | 10971 | && dependent_type_p (scope)); |
e5976695 MM |
10972 | /* Handle the common case (an identifier, but not a template-id) |
10973 | efficiently. */ | |
10974 | if (token->type == CPP_NAME | |
10975 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type != CPP_LESS) | |
a723baf1 | 10976 | { |
a723baf1 MM |
10977 | tree identifier; |
10978 | ||
10979 | /* Look for the identifier. */ | |
10980 | identifier = cp_parser_identifier (parser); | |
10981 | /* If the next token isn't an identifier, we are certainly not | |
10982 | looking at a class-name. */ | |
10983 | if (identifier == error_mark_node) | |
10984 | decl = error_mark_node; | |
10985 | /* If we know this is a type-name, there's no need to look it | |
10986 | up. */ | |
10987 | else if (typename_p) | |
10988 | decl = identifier; | |
10989 | else | |
10990 | { | |
10991 | /* If the next token is a `::', then the name must be a type | |
10992 | name. | |
10993 | ||
10994 | [basic.lookup.qual] | |
10995 | ||
10996 | During the lookup for a name preceding the :: scope | |
10997 | resolution operator, object, function, and enumerator | |
10998 | names are ignored. */ | |
10999 | if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
11000 | type_p = true; | |
11001 | /* Look up the name. */ | |
11002 | decl = cp_parser_lookup_name (parser, identifier, | |
a723baf1 | 11003 | type_p, |
eea9800f | 11004 | /*is_namespace=*/false, |
a723baf1 MM |
11005 | check_dependency_p); |
11006 | } | |
11007 | } | |
e5976695 MM |
11008 | else |
11009 | { | |
11010 | /* Try a template-id. */ | |
11011 | decl = cp_parser_template_id (parser, template_keyword_p, | |
11012 | check_dependency_p); | |
11013 | if (decl == error_mark_node) | |
11014 | return error_mark_node; | |
11015 | } | |
a723baf1 MM |
11016 | |
11017 | decl = cp_parser_maybe_treat_template_as_class (decl, class_head_p); | |
11018 | ||
11019 | /* If this is a typename, create a TYPENAME_TYPE. */ | |
11020 | if (typename_p && decl != error_mark_node) | |
11021 | decl = TYPE_NAME (make_typename_type (scope, decl, | |
11022 | /*complain=*/1)); | |
11023 | ||
11024 | /* Check to see that it is really the name of a class. */ | |
11025 | if (TREE_CODE (decl) == TEMPLATE_ID_EXPR | |
11026 | && TREE_CODE (TREE_OPERAND (decl, 0)) == IDENTIFIER_NODE | |
11027 | && cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
11028 | /* Situations like this: | |
11029 | ||
11030 | template <typename T> struct A { | |
11031 | typename T::template X<int>::I i; | |
11032 | }; | |
11033 | ||
11034 | are problematic. Is `T::template X<int>' a class-name? The | |
11035 | standard does not seem to be definitive, but there is no other | |
11036 | valid interpretation of the following `::'. Therefore, those | |
11037 | names are considered class-names. */ | |
78757caa | 11038 | decl = TYPE_NAME (make_typename_type (scope, decl, tf_error)); |
a723baf1 MM |
11039 | else if (decl == error_mark_node |
11040 | || TREE_CODE (decl) != TYPE_DECL | |
11041 | || !IS_AGGR_TYPE (TREE_TYPE (decl))) | |
11042 | { | |
11043 | cp_parser_error (parser, "expected class-name"); | |
11044 | return error_mark_node; | |
11045 | } | |
11046 | ||
11047 | return decl; | |
11048 | } | |
11049 | ||
11050 | /* Parse a class-specifier. | |
11051 | ||
11052 | class-specifier: | |
11053 | class-head { member-specification [opt] } | |
11054 | ||
11055 | Returns the TREE_TYPE representing the class. */ | |
11056 | ||
11057 | static tree | |
94edc4ab | 11058 | cp_parser_class_specifier (cp_parser* parser) |
a723baf1 MM |
11059 | { |
11060 | cp_token *token; | |
11061 | tree type; | |
11062 | tree attributes = NULL_TREE; | |
11063 | int has_trailing_semicolon; | |
11064 | bool nested_name_specifier_p; | |
a723baf1 MM |
11065 | unsigned saved_num_template_parameter_lists; |
11066 | ||
8d241e0b | 11067 | push_deferring_access_checks (dk_no_deferred); |
cf22909c | 11068 | |
a723baf1 MM |
11069 | /* Parse the class-head. */ |
11070 | type = cp_parser_class_head (parser, | |
cf22909c | 11071 | &nested_name_specifier_p); |
a723baf1 MM |
11072 | /* If the class-head was a semantic disaster, skip the entire body |
11073 | of the class. */ | |
11074 | if (!type) | |
11075 | { | |
11076 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
cf22909c | 11077 | pop_deferring_access_checks (); |
a723baf1 MM |
11078 | return error_mark_node; |
11079 | } | |
cf22909c | 11080 | |
a723baf1 MM |
11081 | /* Look for the `{'. */ |
11082 | if (!cp_parser_require (parser, CPP_OPEN_BRACE, "`{'")) | |
cf22909c KL |
11083 | { |
11084 | pop_deferring_access_checks (); | |
11085 | return error_mark_node; | |
11086 | } | |
11087 | ||
a723baf1 MM |
11088 | /* Issue an error message if type-definitions are forbidden here. */ |
11089 | cp_parser_check_type_definition (parser); | |
11090 | /* Remember that we are defining one more class. */ | |
11091 | ++parser->num_classes_being_defined; | |
11092 | /* Inside the class, surrounding template-parameter-lists do not | |
11093 | apply. */ | |
11094 | saved_num_template_parameter_lists | |
11095 | = parser->num_template_parameter_lists; | |
11096 | parser->num_template_parameter_lists = 0; | |
78757caa | 11097 | |
a723baf1 MM |
11098 | /* Start the class. */ |
11099 | type = begin_class_definition (type); | |
11100 | if (type == error_mark_node) | |
9bcb9aae | 11101 | /* If the type is erroneous, skip the entire body of the class. */ |
a723baf1 MM |
11102 | cp_parser_skip_to_closing_brace (parser); |
11103 | else | |
11104 | /* Parse the member-specification. */ | |
11105 | cp_parser_member_specification_opt (parser); | |
11106 | /* Look for the trailing `}'. */ | |
11107 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
11108 | /* We get better error messages by noticing a common problem: a | |
11109 | missing trailing `;'. */ | |
11110 | token = cp_lexer_peek_token (parser->lexer); | |
11111 | has_trailing_semicolon = (token->type == CPP_SEMICOLON); | |
11112 | /* Look for attributes to apply to this class. */ | |
11113 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
11114 | attributes = cp_parser_attributes_opt (parser); | |
11115 | /* Finish the class definition. */ | |
11116 | type = finish_class_definition (type, | |
11117 | attributes, | |
11118 | has_trailing_semicolon, | |
11119 | nested_name_specifier_p); | |
11120 | /* If this class is not itself within the scope of another class, | |
11121 | then we need to parse the bodies of all of the queued function | |
11122 | definitions. Note that the queued functions defined in a class | |
11123 | are not always processed immediately following the | |
11124 | class-specifier for that class. Consider: | |
11125 | ||
11126 | struct A { | |
11127 | struct B { void f() { sizeof (A); } }; | |
11128 | }; | |
11129 | ||
11130 | If `f' were processed before the processing of `A' were | |
11131 | completed, there would be no way to compute the size of `A'. | |
11132 | Note that the nesting we are interested in here is lexical -- | |
11133 | not the semantic nesting given by TYPE_CONTEXT. In particular, | |
11134 | for: | |
11135 | ||
11136 | struct A { struct B; }; | |
11137 | struct A::B { void f() { } }; | |
11138 | ||
11139 | there is no need to delay the parsing of `A::B::f'. */ | |
11140 | if (--parser->num_classes_being_defined == 0) | |
11141 | { | |
8218bd34 MM |
11142 | tree queue_entry; |
11143 | tree fn; | |
a723baf1 | 11144 | |
8218bd34 MM |
11145 | /* In a first pass, parse default arguments to the functions. |
11146 | Then, in a second pass, parse the bodies of the functions. | |
11147 | This two-phased approach handles cases like: | |
11148 | ||
11149 | struct S { | |
11150 | void f() { g(); } | |
11151 | void g(int i = 3); | |
11152 | }; | |
11153 | ||
11154 | */ | |
8db1028e NS |
11155 | for (TREE_PURPOSE (parser->unparsed_functions_queues) |
11156 | = nreverse (TREE_PURPOSE (parser->unparsed_functions_queues)); | |
11157 | (queue_entry = TREE_PURPOSE (parser->unparsed_functions_queues)); | |
11158 | TREE_PURPOSE (parser->unparsed_functions_queues) | |
11159 | = TREE_CHAIN (TREE_PURPOSE (parser->unparsed_functions_queues))) | |
8218bd34 MM |
11160 | { |
11161 | fn = TREE_VALUE (queue_entry); | |
8218bd34 MM |
11162 | /* Make sure that any template parameters are in scope. */ |
11163 | maybe_begin_member_template_processing (fn); | |
11164 | /* If there are default arguments that have not yet been processed, | |
11165 | take care of them now. */ | |
11166 | cp_parser_late_parsing_default_args (parser, fn); | |
11167 | /* Remove any template parameters from the symbol table. */ | |
11168 | maybe_end_member_template_processing (); | |
11169 | } | |
11170 | /* Now parse the body of the functions. */ | |
8db1028e NS |
11171 | for (TREE_VALUE (parser->unparsed_functions_queues) |
11172 | = nreverse (TREE_VALUE (parser->unparsed_functions_queues)); | |
11173 | (queue_entry = TREE_VALUE (parser->unparsed_functions_queues)); | |
11174 | TREE_VALUE (parser->unparsed_functions_queues) | |
11175 | = TREE_CHAIN (TREE_VALUE (parser->unparsed_functions_queues))) | |
a723baf1 | 11176 | { |
a723baf1 | 11177 | /* Figure out which function we need to process. */ |
a723baf1 MM |
11178 | fn = TREE_VALUE (queue_entry); |
11179 | ||
11180 | /* Parse the function. */ | |
11181 | cp_parser_late_parsing_for_member (parser, fn); | |
a723baf1 MM |
11182 | } |
11183 | ||
a723baf1 MM |
11184 | } |
11185 | ||
11186 | /* Put back any saved access checks. */ | |
cf22909c | 11187 | pop_deferring_access_checks (); |
a723baf1 MM |
11188 | |
11189 | /* Restore the count of active template-parameter-lists. */ | |
11190 | parser->num_template_parameter_lists | |
11191 | = saved_num_template_parameter_lists; | |
11192 | ||
11193 | return type; | |
11194 | } | |
11195 | ||
11196 | /* Parse a class-head. | |
11197 | ||
11198 | class-head: | |
11199 | class-key identifier [opt] base-clause [opt] | |
11200 | class-key nested-name-specifier identifier base-clause [opt] | |
11201 | class-key nested-name-specifier [opt] template-id | |
11202 | base-clause [opt] | |
11203 | ||
11204 | GNU Extensions: | |
11205 | class-key attributes identifier [opt] base-clause [opt] | |
11206 | class-key attributes nested-name-specifier identifier base-clause [opt] | |
11207 | class-key attributes nested-name-specifier [opt] template-id | |
11208 | base-clause [opt] | |
11209 | ||
11210 | Returns the TYPE of the indicated class. Sets | |
11211 | *NESTED_NAME_SPECIFIER_P to TRUE iff one of the productions | |
11212 | involving a nested-name-specifier was used, and FALSE otherwise. | |
a723baf1 MM |
11213 | |
11214 | Returns NULL_TREE if the class-head is syntactically valid, but | |
11215 | semantically invalid in a way that means we should skip the entire | |
11216 | body of the class. */ | |
11217 | ||
11218 | static tree | |
94edc4ab NN |
11219 | cp_parser_class_head (cp_parser* parser, |
11220 | bool* nested_name_specifier_p) | |
a723baf1 MM |
11221 | { |
11222 | cp_token *token; | |
11223 | tree nested_name_specifier; | |
11224 | enum tag_types class_key; | |
11225 | tree id = NULL_TREE; | |
11226 | tree type = NULL_TREE; | |
11227 | tree attributes; | |
11228 | bool template_id_p = false; | |
11229 | bool qualified_p = false; | |
11230 | bool invalid_nested_name_p = false; | |
11231 | unsigned num_templates; | |
11232 | ||
11233 | /* Assume no nested-name-specifier will be present. */ | |
11234 | *nested_name_specifier_p = false; | |
11235 | /* Assume no template parameter lists will be used in defining the | |
11236 | type. */ | |
11237 | num_templates = 0; | |
11238 | ||
11239 | /* Look for the class-key. */ | |
11240 | class_key = cp_parser_class_key (parser); | |
11241 | if (class_key == none_type) | |
11242 | return error_mark_node; | |
11243 | ||
11244 | /* Parse the attributes. */ | |
11245 | attributes = cp_parser_attributes_opt (parser); | |
11246 | ||
11247 | /* If the next token is `::', that is invalid -- but sometimes | |
11248 | people do try to write: | |
11249 | ||
11250 | struct ::S {}; | |
11251 | ||
11252 | Handle this gracefully by accepting the extra qualifier, and then | |
11253 | issuing an error about it later if this really is a | |
2050a1bb | 11254 | class-head. If it turns out just to be an elaborated type |
a723baf1 MM |
11255 | specifier, remain silent. */ |
11256 | if (cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false)) | |
11257 | qualified_p = true; | |
11258 | ||
8d241e0b KL |
11259 | push_deferring_access_checks (dk_no_check); |
11260 | ||
a723baf1 MM |
11261 | /* Determine the name of the class. Begin by looking for an |
11262 | optional nested-name-specifier. */ | |
11263 | nested_name_specifier | |
11264 | = cp_parser_nested_name_specifier_opt (parser, | |
11265 | /*typename_keyword_p=*/false, | |
66d418e6 | 11266 | /*check_dependency_p=*/false, |
a723baf1 MM |
11267 | /*type_p=*/false); |
11268 | /* If there was a nested-name-specifier, then there *must* be an | |
11269 | identifier. */ | |
11270 | if (nested_name_specifier) | |
11271 | { | |
11272 | /* Although the grammar says `identifier', it really means | |
11273 | `class-name' or `template-name'. You are only allowed to | |
11274 | define a class that has already been declared with this | |
11275 | syntax. | |
11276 | ||
11277 | The proposed resolution for Core Issue 180 says that whever | |
11278 | you see `class T::X' you should treat `X' as a type-name. | |
11279 | ||
11280 | It is OK to define an inaccessible class; for example: | |
11281 | ||
11282 | class A { class B; }; | |
11283 | class A::B {}; | |
11284 | ||
a723baf1 MM |
11285 | We do not know if we will see a class-name, or a |
11286 | template-name. We look for a class-name first, in case the | |
11287 | class-name is a template-id; if we looked for the | |
11288 | template-name first we would stop after the template-name. */ | |
11289 | cp_parser_parse_tentatively (parser); | |
11290 | type = cp_parser_class_name (parser, | |
11291 | /*typename_keyword_p=*/false, | |
11292 | /*template_keyword_p=*/false, | |
11293 | /*type_p=*/true, | |
a723baf1 MM |
11294 | /*check_dependency_p=*/false, |
11295 | /*class_head_p=*/true); | |
11296 | /* If that didn't work, ignore the nested-name-specifier. */ | |
11297 | if (!cp_parser_parse_definitely (parser)) | |
11298 | { | |
11299 | invalid_nested_name_p = true; | |
11300 | id = cp_parser_identifier (parser); | |
11301 | if (id == error_mark_node) | |
11302 | id = NULL_TREE; | |
11303 | } | |
11304 | /* If we could not find a corresponding TYPE, treat this | |
11305 | declaration like an unqualified declaration. */ | |
11306 | if (type == error_mark_node) | |
11307 | nested_name_specifier = NULL_TREE; | |
11308 | /* Otherwise, count the number of templates used in TYPE and its | |
11309 | containing scopes. */ | |
11310 | else | |
11311 | { | |
11312 | tree scope; | |
11313 | ||
11314 | for (scope = TREE_TYPE (type); | |
11315 | scope && TREE_CODE (scope) != NAMESPACE_DECL; | |
11316 | scope = (TYPE_P (scope) | |
11317 | ? TYPE_CONTEXT (scope) | |
11318 | : DECL_CONTEXT (scope))) | |
11319 | if (TYPE_P (scope) | |
11320 | && CLASS_TYPE_P (scope) | |
11321 | && CLASSTYPE_TEMPLATE_INFO (scope) | |
2050a1bb MM |
11322 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (scope)) |
11323 | && !CLASSTYPE_TEMPLATE_SPECIALIZATION (scope)) | |
a723baf1 MM |
11324 | ++num_templates; |
11325 | } | |
11326 | } | |
11327 | /* Otherwise, the identifier is optional. */ | |
11328 | else | |
11329 | { | |
11330 | /* We don't know whether what comes next is a template-id, | |
11331 | an identifier, or nothing at all. */ | |
11332 | cp_parser_parse_tentatively (parser); | |
11333 | /* Check for a template-id. */ | |
11334 | id = cp_parser_template_id (parser, | |
11335 | /*template_keyword_p=*/false, | |
11336 | /*check_dependency_p=*/true); | |
11337 | /* If that didn't work, it could still be an identifier. */ | |
11338 | if (!cp_parser_parse_definitely (parser)) | |
11339 | { | |
11340 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME)) | |
11341 | id = cp_parser_identifier (parser); | |
11342 | else | |
11343 | id = NULL_TREE; | |
11344 | } | |
11345 | else | |
11346 | { | |
11347 | template_id_p = true; | |
11348 | ++num_templates; | |
11349 | } | |
11350 | } | |
11351 | ||
8d241e0b KL |
11352 | pop_deferring_access_checks (); |
11353 | ||
a723baf1 MM |
11354 | /* If it's not a `:' or a `{' then we can't really be looking at a |
11355 | class-head, since a class-head only appears as part of a | |
11356 | class-specifier. We have to detect this situation before calling | |
11357 | xref_tag, since that has irreversible side-effects. */ | |
11358 | if (!cp_parser_next_token_starts_class_definition_p (parser)) | |
11359 | { | |
11360 | cp_parser_error (parser, "expected `{' or `:'"); | |
11361 | return error_mark_node; | |
11362 | } | |
11363 | ||
11364 | /* At this point, we're going ahead with the class-specifier, even | |
11365 | if some other problem occurs. */ | |
11366 | cp_parser_commit_to_tentative_parse (parser); | |
11367 | /* Issue the error about the overly-qualified name now. */ | |
11368 | if (qualified_p) | |
11369 | cp_parser_error (parser, | |
11370 | "global qualification of class name is invalid"); | |
11371 | else if (invalid_nested_name_p) | |
11372 | cp_parser_error (parser, | |
11373 | "qualified name does not name a class"); | |
11374 | /* Make sure that the right number of template parameters were | |
11375 | present. */ | |
11376 | if (!cp_parser_check_template_parameters (parser, num_templates)) | |
11377 | /* If something went wrong, there is no point in even trying to | |
11378 | process the class-definition. */ | |
11379 | return NULL_TREE; | |
11380 | ||
a723baf1 MM |
11381 | /* Look up the type. */ |
11382 | if (template_id_p) | |
11383 | { | |
11384 | type = TREE_TYPE (id); | |
11385 | maybe_process_partial_specialization (type); | |
11386 | } | |
11387 | else if (!nested_name_specifier) | |
11388 | { | |
11389 | /* If the class was unnamed, create a dummy name. */ | |
11390 | if (!id) | |
11391 | id = make_anon_name (); | |
11392 | type = xref_tag (class_key, id, attributes, /*globalize=*/0); | |
11393 | } | |
11394 | else | |
11395 | { | |
a723baf1 | 11396 | tree class_type; |
089d6ea7 | 11397 | tree scope; |
a723baf1 MM |
11398 | |
11399 | /* Given: | |
11400 | ||
11401 | template <typename T> struct S { struct T }; | |
14d22dd6 | 11402 | template <typename T> struct S<T>::T { }; |
a723baf1 MM |
11403 | |
11404 | we will get a TYPENAME_TYPE when processing the definition of | |
11405 | `S::T'. We need to resolve it to the actual type before we | |
11406 | try to define it. */ | |
11407 | if (TREE_CODE (TREE_TYPE (type)) == TYPENAME_TYPE) | |
11408 | { | |
14d22dd6 MM |
11409 | class_type = resolve_typename_type (TREE_TYPE (type), |
11410 | /*only_current_p=*/false); | |
11411 | if (class_type != error_mark_node) | |
11412 | type = TYPE_NAME (class_type); | |
11413 | else | |
11414 | { | |
11415 | cp_parser_error (parser, "could not resolve typename type"); | |
11416 | type = error_mark_node; | |
11417 | } | |
a723baf1 MM |
11418 | } |
11419 | ||
089d6ea7 MM |
11420 | /* Figure out in what scope the declaration is being placed. */ |
11421 | scope = current_scope (); | |
11422 | if (!scope) | |
11423 | scope = current_namespace; | |
11424 | /* If that scope does not contain the scope in which the | |
11425 | class was originally declared, the program is invalid. */ | |
11426 | if (scope && !is_ancestor (scope, CP_DECL_CONTEXT (type))) | |
11427 | { | |
0e136342 | 11428 | error ("declaration of `%D' in `%D' which does not " |
089d6ea7 MM |
11429 | "enclose `%D'", type, scope, nested_name_specifier); |
11430 | return NULL_TREE; | |
11431 | } | |
11432 | ||
a723baf1 MM |
11433 | maybe_process_partial_specialization (TREE_TYPE (type)); |
11434 | class_type = current_class_type; | |
11435 | type = TREE_TYPE (handle_class_head (class_key, | |
11436 | nested_name_specifier, | |
11437 | type, | |
089d6ea7 | 11438 | attributes)); |
a723baf1 MM |
11439 | if (type != error_mark_node) |
11440 | { | |
11441 | if (!class_type && TYPE_CONTEXT (type)) | |
11442 | *nested_name_specifier_p = true; | |
11443 | else if (class_type && !same_type_p (TYPE_CONTEXT (type), | |
11444 | class_type)) | |
11445 | *nested_name_specifier_p = true; | |
11446 | } | |
11447 | } | |
11448 | /* Indicate whether this class was declared as a `class' or as a | |
11449 | `struct'. */ | |
11450 | if (TREE_CODE (type) == RECORD_TYPE) | |
11451 | CLASSTYPE_DECLARED_CLASS (type) = (class_key == class_type); | |
11452 | cp_parser_check_class_key (class_key, type); | |
11453 | ||
11454 | /* Enter the scope containing the class; the names of base classes | |
11455 | should be looked up in that context. For example, given: | |
11456 | ||
11457 | struct A { struct B {}; struct C; }; | |
11458 | struct A::C : B {}; | |
11459 | ||
11460 | is valid. */ | |
11461 | if (nested_name_specifier) | |
11462 | push_scope (nested_name_specifier); | |
11463 | /* Now, look for the base-clause. */ | |
11464 | token = cp_lexer_peek_token (parser->lexer); | |
11465 | if (token->type == CPP_COLON) | |
11466 | { | |
11467 | tree bases; | |
11468 | ||
11469 | /* Get the list of base-classes. */ | |
11470 | bases = cp_parser_base_clause (parser); | |
11471 | /* Process them. */ | |
11472 | xref_basetypes (type, bases); | |
11473 | } | |
11474 | /* Leave the scope given by the nested-name-specifier. We will | |
11475 | enter the class scope itself while processing the members. */ | |
11476 | if (nested_name_specifier) | |
11477 | pop_scope (nested_name_specifier); | |
11478 | ||
11479 | return type; | |
11480 | } | |
11481 | ||
11482 | /* Parse a class-key. | |
11483 | ||
11484 | class-key: | |
11485 | class | |
11486 | struct | |
11487 | union | |
11488 | ||
11489 | Returns the kind of class-key specified, or none_type to indicate | |
11490 | error. */ | |
11491 | ||
11492 | static enum tag_types | |
94edc4ab | 11493 | cp_parser_class_key (cp_parser* parser) |
a723baf1 MM |
11494 | { |
11495 | cp_token *token; | |
11496 | enum tag_types tag_type; | |
11497 | ||
11498 | /* Look for the class-key. */ | |
11499 | token = cp_parser_require (parser, CPP_KEYWORD, "class-key"); | |
11500 | if (!token) | |
11501 | return none_type; | |
11502 | ||
11503 | /* Check to see if the TOKEN is a class-key. */ | |
11504 | tag_type = cp_parser_token_is_class_key (token); | |
11505 | if (!tag_type) | |
11506 | cp_parser_error (parser, "expected class-key"); | |
11507 | return tag_type; | |
11508 | } | |
11509 | ||
11510 | /* Parse an (optional) member-specification. | |
11511 | ||
11512 | member-specification: | |
11513 | member-declaration member-specification [opt] | |
11514 | access-specifier : member-specification [opt] */ | |
11515 | ||
11516 | static void | |
94edc4ab | 11517 | cp_parser_member_specification_opt (cp_parser* parser) |
a723baf1 MM |
11518 | { |
11519 | while (true) | |
11520 | { | |
11521 | cp_token *token; | |
11522 | enum rid keyword; | |
11523 | ||
11524 | /* Peek at the next token. */ | |
11525 | token = cp_lexer_peek_token (parser->lexer); | |
11526 | /* If it's a `}', or EOF then we've seen all the members. */ | |
11527 | if (token->type == CPP_CLOSE_BRACE || token->type == CPP_EOF) | |
11528 | break; | |
11529 | ||
11530 | /* See if this token is a keyword. */ | |
11531 | keyword = token->keyword; | |
11532 | switch (keyword) | |
11533 | { | |
11534 | case RID_PUBLIC: | |
11535 | case RID_PROTECTED: | |
11536 | case RID_PRIVATE: | |
11537 | /* Consume the access-specifier. */ | |
11538 | cp_lexer_consume_token (parser->lexer); | |
11539 | /* Remember which access-specifier is active. */ | |
11540 | current_access_specifier = token->value; | |
11541 | /* Look for the `:'. */ | |
11542 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
11543 | break; | |
11544 | ||
11545 | default: | |
11546 | /* Otherwise, the next construction must be a | |
11547 | member-declaration. */ | |
11548 | cp_parser_member_declaration (parser); | |
a723baf1 MM |
11549 | } |
11550 | } | |
11551 | } | |
11552 | ||
11553 | /* Parse a member-declaration. | |
11554 | ||
11555 | member-declaration: | |
11556 | decl-specifier-seq [opt] member-declarator-list [opt] ; | |
11557 | function-definition ; [opt] | |
11558 | :: [opt] nested-name-specifier template [opt] unqualified-id ; | |
11559 | using-declaration | |
11560 | template-declaration | |
11561 | ||
11562 | member-declarator-list: | |
11563 | member-declarator | |
11564 | member-declarator-list , member-declarator | |
11565 | ||
11566 | member-declarator: | |
11567 | declarator pure-specifier [opt] | |
11568 | declarator constant-initializer [opt] | |
11569 | identifier [opt] : constant-expression | |
11570 | ||
11571 | GNU Extensions: | |
11572 | ||
11573 | member-declaration: | |
11574 | __extension__ member-declaration | |
11575 | ||
11576 | member-declarator: | |
11577 | declarator attributes [opt] pure-specifier [opt] | |
11578 | declarator attributes [opt] constant-initializer [opt] | |
11579 | identifier [opt] attributes [opt] : constant-expression */ | |
11580 | ||
11581 | static void | |
94edc4ab | 11582 | cp_parser_member_declaration (cp_parser* parser) |
a723baf1 MM |
11583 | { |
11584 | tree decl_specifiers; | |
11585 | tree prefix_attributes; | |
11586 | tree decl; | |
11587 | bool declares_class_or_enum; | |
11588 | bool friend_p; | |
11589 | cp_token *token; | |
11590 | int saved_pedantic; | |
11591 | ||
11592 | /* Check for the `__extension__' keyword. */ | |
11593 | if (cp_parser_extension_opt (parser, &saved_pedantic)) | |
11594 | { | |
11595 | /* Recurse. */ | |
11596 | cp_parser_member_declaration (parser); | |
11597 | /* Restore the old value of the PEDANTIC flag. */ | |
11598 | pedantic = saved_pedantic; | |
11599 | ||
11600 | return; | |
11601 | } | |
11602 | ||
11603 | /* Check for a template-declaration. */ | |
11604 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
11605 | { | |
11606 | /* Parse the template-declaration. */ | |
11607 | cp_parser_template_declaration (parser, /*member_p=*/true); | |
11608 | ||
11609 | return; | |
11610 | } | |
11611 | ||
11612 | /* Check for a using-declaration. */ | |
11613 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_USING)) | |
11614 | { | |
11615 | /* Parse the using-declaration. */ | |
11616 | cp_parser_using_declaration (parser); | |
11617 | ||
11618 | return; | |
11619 | } | |
11620 | ||
11621 | /* We can't tell whether we're looking at a declaration or a | |
11622 | function-definition. */ | |
11623 | cp_parser_parse_tentatively (parser); | |
11624 | ||
11625 | /* Parse the decl-specifier-seq. */ | |
11626 | decl_specifiers | |
11627 | = cp_parser_decl_specifier_seq (parser, | |
11628 | CP_PARSER_FLAGS_OPTIONAL, | |
11629 | &prefix_attributes, | |
11630 | &declares_class_or_enum); | |
8fbc5ae7 MM |
11631 | /* Check for an invalid type-name. */ |
11632 | if (cp_parser_diagnose_invalid_type_name (parser)) | |
11633 | return; | |
a723baf1 MM |
11634 | /* If there is no declarator, then the decl-specifier-seq should |
11635 | specify a type. */ | |
11636 | if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
11637 | { | |
11638 | /* If there was no decl-specifier-seq, and the next token is a | |
11639 | `;', then we have something like: | |
11640 | ||
11641 | struct S { ; }; | |
11642 | ||
11643 | [class.mem] | |
11644 | ||
11645 | Each member-declaration shall declare at least one member | |
11646 | name of the class. */ | |
11647 | if (!decl_specifiers) | |
11648 | { | |
11649 | if (pedantic) | |
11650 | pedwarn ("extra semicolon"); | |
11651 | } | |
11652 | else | |
11653 | { | |
11654 | tree type; | |
11655 | ||
11656 | /* See if this declaration is a friend. */ | |
11657 | friend_p = cp_parser_friend_p (decl_specifiers); | |
11658 | /* If there were decl-specifiers, check to see if there was | |
11659 | a class-declaration. */ | |
11660 | type = check_tag_decl (decl_specifiers); | |
11661 | /* Nested classes have already been added to the class, but | |
11662 | a `friend' needs to be explicitly registered. */ | |
11663 | if (friend_p) | |
11664 | { | |
11665 | /* If the `friend' keyword was present, the friend must | |
11666 | be introduced with a class-key. */ | |
11667 | if (!declares_class_or_enum) | |
11668 | error ("a class-key must be used when declaring a friend"); | |
11669 | /* In this case: | |
11670 | ||
11671 | template <typename T> struct A { | |
11672 | friend struct A<T>::B; | |
11673 | }; | |
11674 | ||
11675 | A<T>::B will be represented by a TYPENAME_TYPE, and | |
11676 | therefore not recognized by check_tag_decl. */ | |
11677 | if (!type) | |
11678 | { | |
11679 | tree specifier; | |
11680 | ||
11681 | for (specifier = decl_specifiers; | |
11682 | specifier; | |
11683 | specifier = TREE_CHAIN (specifier)) | |
11684 | { | |
11685 | tree s = TREE_VALUE (specifier); | |
11686 | ||
11687 | if (TREE_CODE (s) == IDENTIFIER_NODE | |
11688 | && IDENTIFIER_GLOBAL_VALUE (s)) | |
11689 | type = IDENTIFIER_GLOBAL_VALUE (s); | |
11690 | if (TREE_CODE (s) == TYPE_DECL) | |
11691 | s = TREE_TYPE (s); | |
11692 | if (TYPE_P (s)) | |
11693 | { | |
11694 | type = s; | |
11695 | break; | |
11696 | } | |
11697 | } | |
11698 | } | |
11699 | if (!type) | |
11700 | error ("friend declaration does not name a class or " | |
11701 | "function"); | |
11702 | else | |
11703 | make_friend_class (current_class_type, type); | |
11704 | } | |
11705 | /* If there is no TYPE, an error message will already have | |
11706 | been issued. */ | |
11707 | else if (!type) | |
11708 | ; | |
11709 | /* An anonymous aggregate has to be handled specially; such | |
11710 | a declaration really declares a data member (with a | |
11711 | particular type), as opposed to a nested class. */ | |
11712 | else if (ANON_AGGR_TYPE_P (type)) | |
11713 | { | |
11714 | /* Remove constructors and such from TYPE, now that we | |
34cd5ae7 | 11715 | know it is an anonymous aggregate. */ |
a723baf1 MM |
11716 | fixup_anonymous_aggr (type); |
11717 | /* And make the corresponding data member. */ | |
11718 | decl = build_decl (FIELD_DECL, NULL_TREE, type); | |
11719 | /* Add it to the class. */ | |
11720 | finish_member_declaration (decl); | |
11721 | } | |
11722 | } | |
11723 | } | |
11724 | else | |
11725 | { | |
11726 | /* See if these declarations will be friends. */ | |
11727 | friend_p = cp_parser_friend_p (decl_specifiers); | |
11728 | ||
11729 | /* Keep going until we hit the `;' at the end of the | |
11730 | declaration. */ | |
11731 | while (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
11732 | { | |
11733 | tree attributes = NULL_TREE; | |
11734 | tree first_attribute; | |
11735 | ||
11736 | /* Peek at the next token. */ | |
11737 | token = cp_lexer_peek_token (parser->lexer); | |
11738 | ||
11739 | /* Check for a bitfield declaration. */ | |
11740 | if (token->type == CPP_COLON | |
11741 | || (token->type == CPP_NAME | |
11742 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
11743 | == CPP_COLON)) | |
11744 | { | |
11745 | tree identifier; | |
11746 | tree width; | |
11747 | ||
11748 | /* Get the name of the bitfield. Note that we cannot just | |
11749 | check TOKEN here because it may have been invalidated by | |
11750 | the call to cp_lexer_peek_nth_token above. */ | |
11751 | if (cp_lexer_peek_token (parser->lexer)->type != CPP_COLON) | |
11752 | identifier = cp_parser_identifier (parser); | |
11753 | else | |
11754 | identifier = NULL_TREE; | |
11755 | ||
11756 | /* Consume the `:' token. */ | |
11757 | cp_lexer_consume_token (parser->lexer); | |
11758 | /* Get the width of the bitfield. */ | |
14d22dd6 MM |
11759 | width |
11760 | = cp_parser_constant_expression (parser, | |
11761 | /*allow_non_constant=*/false, | |
11762 | NULL); | |
a723baf1 MM |
11763 | |
11764 | /* Look for attributes that apply to the bitfield. */ | |
11765 | attributes = cp_parser_attributes_opt (parser); | |
11766 | /* Remember which attributes are prefix attributes and | |
11767 | which are not. */ | |
11768 | first_attribute = attributes; | |
11769 | /* Combine the attributes. */ | |
11770 | attributes = chainon (prefix_attributes, attributes); | |
11771 | ||
11772 | /* Create the bitfield declaration. */ | |
11773 | decl = grokbitfield (identifier, | |
11774 | decl_specifiers, | |
11775 | width); | |
11776 | /* Apply the attributes. */ | |
11777 | cplus_decl_attributes (&decl, attributes, /*flags=*/0); | |
11778 | } | |
11779 | else | |
11780 | { | |
11781 | tree declarator; | |
11782 | tree initializer; | |
11783 | tree asm_specification; | |
7efa3e22 | 11784 | int ctor_dtor_or_conv_p; |
a723baf1 MM |
11785 | |
11786 | /* Parse the declarator. */ | |
11787 | declarator | |
62b8a44e | 11788 | = cp_parser_declarator (parser, CP_PARSER_DECLARATOR_NAMED, |
a723baf1 MM |
11789 | &ctor_dtor_or_conv_p); |
11790 | ||
11791 | /* If something went wrong parsing the declarator, make sure | |
11792 | that we at least consume some tokens. */ | |
11793 | if (declarator == error_mark_node) | |
11794 | { | |
11795 | /* Skip to the end of the statement. */ | |
11796 | cp_parser_skip_to_end_of_statement (parser); | |
11797 | break; | |
11798 | } | |
11799 | ||
11800 | /* Look for an asm-specification. */ | |
11801 | asm_specification = cp_parser_asm_specification_opt (parser); | |
11802 | /* Look for attributes that apply to the declaration. */ | |
11803 | attributes = cp_parser_attributes_opt (parser); | |
11804 | /* Remember which attributes are prefix attributes and | |
11805 | which are not. */ | |
11806 | first_attribute = attributes; | |
11807 | /* Combine the attributes. */ | |
11808 | attributes = chainon (prefix_attributes, attributes); | |
11809 | ||
11810 | /* If it's an `=', then we have a constant-initializer or a | |
11811 | pure-specifier. It is not correct to parse the | |
11812 | initializer before registering the member declaration | |
11813 | since the member declaration should be in scope while | |
11814 | its initializer is processed. However, the rest of the | |
11815 | front end does not yet provide an interface that allows | |
11816 | us to handle this correctly. */ | |
11817 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
11818 | { | |
11819 | /* In [class.mem]: | |
11820 | ||
11821 | A pure-specifier shall be used only in the declaration of | |
11822 | a virtual function. | |
11823 | ||
11824 | A member-declarator can contain a constant-initializer | |
11825 | only if it declares a static member of integral or | |
11826 | enumeration type. | |
11827 | ||
11828 | Therefore, if the DECLARATOR is for a function, we look | |
11829 | for a pure-specifier; otherwise, we look for a | |
11830 | constant-initializer. When we call `grokfield', it will | |
11831 | perform more stringent semantics checks. */ | |
11832 | if (TREE_CODE (declarator) == CALL_EXPR) | |
11833 | initializer = cp_parser_pure_specifier (parser); | |
11834 | else | |
11835 | { | |
11836 | /* This declaration cannot be a function | |
11837 | definition. */ | |
11838 | cp_parser_commit_to_tentative_parse (parser); | |
11839 | /* Parse the initializer. */ | |
11840 | initializer = cp_parser_constant_initializer (parser); | |
11841 | } | |
11842 | } | |
11843 | /* Otherwise, there is no initializer. */ | |
11844 | else | |
11845 | initializer = NULL_TREE; | |
11846 | ||
11847 | /* See if we are probably looking at a function | |
11848 | definition. We are certainly not looking at at a | |
11849 | member-declarator. Calling `grokfield' has | |
11850 | side-effects, so we must not do it unless we are sure | |
11851 | that we are looking at a member-declarator. */ | |
11852 | if (cp_parser_token_starts_function_definition_p | |
11853 | (cp_lexer_peek_token (parser->lexer))) | |
11854 | decl = error_mark_node; | |
11855 | else | |
39703eb9 MM |
11856 | { |
11857 | /* Create the declaration. */ | |
11858 | decl = grokfield (declarator, | |
11859 | decl_specifiers, | |
11860 | initializer, | |
11861 | asm_specification, | |
11862 | attributes); | |
11863 | /* Any initialization must have been from a | |
11864 | constant-expression. */ | |
11865 | if (decl && TREE_CODE (decl) == VAR_DECL && initializer) | |
11866 | DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = 1; | |
11867 | } | |
a723baf1 MM |
11868 | } |
11869 | ||
11870 | /* Reset PREFIX_ATTRIBUTES. */ | |
11871 | while (attributes && TREE_CHAIN (attributes) != first_attribute) | |
11872 | attributes = TREE_CHAIN (attributes); | |
11873 | if (attributes) | |
11874 | TREE_CHAIN (attributes) = NULL_TREE; | |
11875 | ||
11876 | /* If there is any qualification still in effect, clear it | |
11877 | now; we will be starting fresh with the next declarator. */ | |
11878 | parser->scope = NULL_TREE; | |
11879 | parser->qualifying_scope = NULL_TREE; | |
11880 | parser->object_scope = NULL_TREE; | |
11881 | /* If it's a `,', then there are more declarators. */ | |
11882 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
11883 | cp_lexer_consume_token (parser->lexer); | |
11884 | /* If the next token isn't a `;', then we have a parse error. */ | |
11885 | else if (cp_lexer_next_token_is_not (parser->lexer, | |
11886 | CPP_SEMICOLON)) | |
11887 | { | |
11888 | cp_parser_error (parser, "expected `;'"); | |
11889 | /* Skip tokens until we find a `;' */ | |
11890 | cp_parser_skip_to_end_of_statement (parser); | |
11891 | ||
11892 | break; | |
11893 | } | |
11894 | ||
11895 | if (decl) | |
11896 | { | |
11897 | /* Add DECL to the list of members. */ | |
11898 | if (!friend_p) | |
11899 | finish_member_declaration (decl); | |
11900 | ||
a723baf1 | 11901 | if (TREE_CODE (decl) == FUNCTION_DECL) |
8db1028e | 11902 | cp_parser_save_default_args (parser, decl); |
a723baf1 MM |
11903 | } |
11904 | } | |
11905 | } | |
11906 | ||
11907 | /* If everything went well, look for the `;'. */ | |
11908 | if (cp_parser_parse_definitely (parser)) | |
11909 | { | |
11910 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
11911 | return; | |
11912 | } | |
11913 | ||
11914 | /* Parse the function-definition. */ | |
11915 | decl = cp_parser_function_definition (parser, &friend_p); | |
11916 | /* If the member was not a friend, declare it here. */ | |
11917 | if (!friend_p) | |
11918 | finish_member_declaration (decl); | |
11919 | /* Peek at the next token. */ | |
11920 | token = cp_lexer_peek_token (parser->lexer); | |
11921 | /* If the next token is a semicolon, consume it. */ | |
11922 | if (token->type == CPP_SEMICOLON) | |
11923 | cp_lexer_consume_token (parser->lexer); | |
11924 | } | |
11925 | ||
11926 | /* Parse a pure-specifier. | |
11927 | ||
11928 | pure-specifier: | |
11929 | = 0 | |
11930 | ||
11931 | Returns INTEGER_ZERO_NODE if a pure specifier is found. | |
11932 | Otherwiser, ERROR_MARK_NODE is returned. */ | |
11933 | ||
11934 | static tree | |
94edc4ab | 11935 | cp_parser_pure_specifier (cp_parser* parser) |
a723baf1 MM |
11936 | { |
11937 | cp_token *token; | |
11938 | ||
11939 | /* Look for the `=' token. */ | |
11940 | if (!cp_parser_require (parser, CPP_EQ, "`='")) | |
11941 | return error_mark_node; | |
11942 | /* Look for the `0' token. */ | |
11943 | token = cp_parser_require (parser, CPP_NUMBER, "`0'"); | |
11944 | /* Unfortunately, this will accept `0L' and `0x00' as well. We need | |
11945 | to get information from the lexer about how the number was | |
11946 | spelled in order to fix this problem. */ | |
11947 | if (!token || !integer_zerop (token->value)) | |
11948 | return error_mark_node; | |
11949 | ||
11950 | return integer_zero_node; | |
11951 | } | |
11952 | ||
11953 | /* Parse a constant-initializer. | |
11954 | ||
11955 | constant-initializer: | |
11956 | = constant-expression | |
11957 | ||
11958 | Returns a representation of the constant-expression. */ | |
11959 | ||
11960 | static tree | |
94edc4ab | 11961 | cp_parser_constant_initializer (cp_parser* parser) |
a723baf1 MM |
11962 | { |
11963 | /* Look for the `=' token. */ | |
11964 | if (!cp_parser_require (parser, CPP_EQ, "`='")) | |
11965 | return error_mark_node; | |
11966 | ||
11967 | /* It is invalid to write: | |
11968 | ||
11969 | struct S { static const int i = { 7 }; }; | |
11970 | ||
11971 | */ | |
11972 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)) | |
11973 | { | |
11974 | cp_parser_error (parser, | |
11975 | "a brace-enclosed initializer is not allowed here"); | |
11976 | /* Consume the opening brace. */ | |
11977 | cp_lexer_consume_token (parser->lexer); | |
11978 | /* Skip the initializer. */ | |
11979 | cp_parser_skip_to_closing_brace (parser); | |
11980 | /* Look for the trailing `}'. */ | |
11981 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
11982 | ||
11983 | return error_mark_node; | |
11984 | } | |
11985 | ||
14d22dd6 MM |
11986 | return cp_parser_constant_expression (parser, |
11987 | /*allow_non_constant=*/false, | |
11988 | NULL); | |
a723baf1 MM |
11989 | } |
11990 | ||
11991 | /* Derived classes [gram.class.derived] */ | |
11992 | ||
11993 | /* Parse a base-clause. | |
11994 | ||
11995 | base-clause: | |
11996 | : base-specifier-list | |
11997 | ||
11998 | base-specifier-list: | |
11999 | base-specifier | |
12000 | base-specifier-list , base-specifier | |
12001 | ||
12002 | Returns a TREE_LIST representing the base-classes, in the order in | |
12003 | which they were declared. The representation of each node is as | |
12004 | described by cp_parser_base_specifier. | |
12005 | ||
12006 | In the case that no bases are specified, this function will return | |
12007 | NULL_TREE, not ERROR_MARK_NODE. */ | |
12008 | ||
12009 | static tree | |
94edc4ab | 12010 | cp_parser_base_clause (cp_parser* parser) |
a723baf1 MM |
12011 | { |
12012 | tree bases = NULL_TREE; | |
12013 | ||
12014 | /* Look for the `:' that begins the list. */ | |
12015 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
12016 | ||
12017 | /* Scan the base-specifier-list. */ | |
12018 | while (true) | |
12019 | { | |
12020 | cp_token *token; | |
12021 | tree base; | |
12022 | ||
12023 | /* Look for the base-specifier. */ | |
12024 | base = cp_parser_base_specifier (parser); | |
12025 | /* Add BASE to the front of the list. */ | |
12026 | if (base != error_mark_node) | |
12027 | { | |
12028 | TREE_CHAIN (base) = bases; | |
12029 | bases = base; | |
12030 | } | |
12031 | /* Peek at the next token. */ | |
12032 | token = cp_lexer_peek_token (parser->lexer); | |
12033 | /* If it's not a comma, then the list is complete. */ | |
12034 | if (token->type != CPP_COMMA) | |
12035 | break; | |
12036 | /* Consume the `,'. */ | |
12037 | cp_lexer_consume_token (parser->lexer); | |
12038 | } | |
12039 | ||
12040 | /* PARSER->SCOPE may still be non-NULL at this point, if the last | |
12041 | base class had a qualified name. However, the next name that | |
12042 | appears is certainly not qualified. */ | |
12043 | parser->scope = NULL_TREE; | |
12044 | parser->qualifying_scope = NULL_TREE; | |
12045 | parser->object_scope = NULL_TREE; | |
12046 | ||
12047 | return nreverse (bases); | |
12048 | } | |
12049 | ||
12050 | /* Parse a base-specifier. | |
12051 | ||
12052 | base-specifier: | |
12053 | :: [opt] nested-name-specifier [opt] class-name | |
12054 | virtual access-specifier [opt] :: [opt] nested-name-specifier | |
12055 | [opt] class-name | |
12056 | access-specifier virtual [opt] :: [opt] nested-name-specifier | |
12057 | [opt] class-name | |
12058 | ||
12059 | Returns a TREE_LIST. The TREE_PURPOSE will be one of | |
12060 | ACCESS_{DEFAULT,PUBLIC,PROTECTED,PRIVATE}_[VIRTUAL]_NODE to | |
12061 | indicate the specifiers provided. The TREE_VALUE will be a TYPE | |
12062 | (or the ERROR_MARK_NODE) indicating the type that was specified. */ | |
12063 | ||
12064 | static tree | |
94edc4ab | 12065 | cp_parser_base_specifier (cp_parser* parser) |
a723baf1 MM |
12066 | { |
12067 | cp_token *token; | |
12068 | bool done = false; | |
12069 | bool virtual_p = false; | |
12070 | bool duplicate_virtual_error_issued_p = false; | |
12071 | bool duplicate_access_error_issued_p = false; | |
bbaab916 | 12072 | bool class_scope_p, template_p; |
dbbf88d1 | 12073 | tree access = access_default_node; |
a723baf1 MM |
12074 | tree type; |
12075 | ||
12076 | /* Process the optional `virtual' and `access-specifier'. */ | |
12077 | while (!done) | |
12078 | { | |
12079 | /* Peek at the next token. */ | |
12080 | token = cp_lexer_peek_token (parser->lexer); | |
12081 | /* Process `virtual'. */ | |
12082 | switch (token->keyword) | |
12083 | { | |
12084 | case RID_VIRTUAL: | |
12085 | /* If `virtual' appears more than once, issue an error. */ | |
12086 | if (virtual_p && !duplicate_virtual_error_issued_p) | |
12087 | { | |
12088 | cp_parser_error (parser, | |
12089 | "`virtual' specified more than once in base-specified"); | |
12090 | duplicate_virtual_error_issued_p = true; | |
12091 | } | |
12092 | ||
12093 | virtual_p = true; | |
12094 | ||
12095 | /* Consume the `virtual' token. */ | |
12096 | cp_lexer_consume_token (parser->lexer); | |
12097 | ||
12098 | break; | |
12099 | ||
12100 | case RID_PUBLIC: | |
12101 | case RID_PROTECTED: | |
12102 | case RID_PRIVATE: | |
12103 | /* If more than one access specifier appears, issue an | |
12104 | error. */ | |
dbbf88d1 NS |
12105 | if (access != access_default_node |
12106 | && !duplicate_access_error_issued_p) | |
a723baf1 MM |
12107 | { |
12108 | cp_parser_error (parser, | |
12109 | "more than one access specifier in base-specified"); | |
12110 | duplicate_access_error_issued_p = true; | |
12111 | } | |
12112 | ||
dbbf88d1 | 12113 | access = ridpointers[(int) token->keyword]; |
a723baf1 MM |
12114 | |
12115 | /* Consume the access-specifier. */ | |
12116 | cp_lexer_consume_token (parser->lexer); | |
12117 | ||
12118 | break; | |
12119 | ||
12120 | default: | |
12121 | done = true; | |
12122 | break; | |
12123 | } | |
12124 | } | |
12125 | ||
a723baf1 MM |
12126 | /* Look for the optional `::' operator. */ |
12127 | cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false); | |
12128 | /* Look for the nested-name-specifier. The simplest way to | |
12129 | implement: | |
12130 | ||
12131 | [temp.res] | |
12132 | ||
12133 | The keyword `typename' is not permitted in a base-specifier or | |
12134 | mem-initializer; in these contexts a qualified name that | |
12135 | depends on a template-parameter is implicitly assumed to be a | |
12136 | type name. | |
12137 | ||
12138 | is to pretend that we have seen the `typename' keyword at this | |
12139 | point. */ | |
12140 | cp_parser_nested_name_specifier_opt (parser, | |
12141 | /*typename_keyword_p=*/true, | |
12142 | /*check_dependency_p=*/true, | |
12143 | /*type_p=*/true); | |
12144 | /* If the base class is given by a qualified name, assume that names | |
12145 | we see are type names or templates, as appropriate. */ | |
12146 | class_scope_p = (parser->scope && TYPE_P (parser->scope)); | |
bbaab916 NS |
12147 | template_p = class_scope_p && cp_parser_optional_template_keyword (parser); |
12148 | ||
a723baf1 MM |
12149 | /* Finally, look for the class-name. */ |
12150 | type = cp_parser_class_name (parser, | |
12151 | class_scope_p, | |
bbaab916 | 12152 | template_p, |
a723baf1 | 12153 | /*type_p=*/true, |
a723baf1 MM |
12154 | /*check_dependency_p=*/true, |
12155 | /*class_head_p=*/false); | |
12156 | ||
12157 | if (type == error_mark_node) | |
12158 | return error_mark_node; | |
12159 | ||
dbbf88d1 | 12160 | return finish_base_specifier (TREE_TYPE (type), access, virtual_p); |
a723baf1 MM |
12161 | } |
12162 | ||
12163 | /* Exception handling [gram.exception] */ | |
12164 | ||
12165 | /* Parse an (optional) exception-specification. | |
12166 | ||
12167 | exception-specification: | |
12168 | throw ( type-id-list [opt] ) | |
12169 | ||
12170 | Returns a TREE_LIST representing the exception-specification. The | |
12171 | TREE_VALUE of each node is a type. */ | |
12172 | ||
12173 | static tree | |
94edc4ab | 12174 | cp_parser_exception_specification_opt (cp_parser* parser) |
a723baf1 MM |
12175 | { |
12176 | cp_token *token; | |
12177 | tree type_id_list; | |
12178 | ||
12179 | /* Peek at the next token. */ | |
12180 | token = cp_lexer_peek_token (parser->lexer); | |
12181 | /* If it's not `throw', then there's no exception-specification. */ | |
12182 | if (!cp_parser_is_keyword (token, RID_THROW)) | |
12183 | return NULL_TREE; | |
12184 | ||
12185 | /* Consume the `throw'. */ | |
12186 | cp_lexer_consume_token (parser->lexer); | |
12187 | ||
12188 | /* Look for the `('. */ | |
12189 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12190 | ||
12191 | /* Peek at the next token. */ | |
12192 | token = cp_lexer_peek_token (parser->lexer); | |
12193 | /* If it's not a `)', then there is a type-id-list. */ | |
12194 | if (token->type != CPP_CLOSE_PAREN) | |
12195 | { | |
12196 | const char *saved_message; | |
12197 | ||
12198 | /* Types may not be defined in an exception-specification. */ | |
12199 | saved_message = parser->type_definition_forbidden_message; | |
12200 | parser->type_definition_forbidden_message | |
12201 | = "types may not be defined in an exception-specification"; | |
12202 | /* Parse the type-id-list. */ | |
12203 | type_id_list = cp_parser_type_id_list (parser); | |
12204 | /* Restore the saved message. */ | |
12205 | parser->type_definition_forbidden_message = saved_message; | |
12206 | } | |
12207 | else | |
12208 | type_id_list = empty_except_spec; | |
12209 | ||
12210 | /* Look for the `)'. */ | |
12211 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12212 | ||
12213 | return type_id_list; | |
12214 | } | |
12215 | ||
12216 | /* Parse an (optional) type-id-list. | |
12217 | ||
12218 | type-id-list: | |
12219 | type-id | |
12220 | type-id-list , type-id | |
12221 | ||
12222 | Returns a TREE_LIST. The TREE_VALUE of each node is a TYPE, | |
12223 | in the order that the types were presented. */ | |
12224 | ||
12225 | static tree | |
94edc4ab | 12226 | cp_parser_type_id_list (cp_parser* parser) |
a723baf1 MM |
12227 | { |
12228 | tree types = NULL_TREE; | |
12229 | ||
12230 | while (true) | |
12231 | { | |
12232 | cp_token *token; | |
12233 | tree type; | |
12234 | ||
12235 | /* Get the next type-id. */ | |
12236 | type = cp_parser_type_id (parser); | |
12237 | /* Add it to the list. */ | |
12238 | types = add_exception_specifier (types, type, /*complain=*/1); | |
12239 | /* Peek at the next token. */ | |
12240 | token = cp_lexer_peek_token (parser->lexer); | |
12241 | /* If it is not a `,', we are done. */ | |
12242 | if (token->type != CPP_COMMA) | |
12243 | break; | |
12244 | /* Consume the `,'. */ | |
12245 | cp_lexer_consume_token (parser->lexer); | |
12246 | } | |
12247 | ||
12248 | return nreverse (types); | |
12249 | } | |
12250 | ||
12251 | /* Parse a try-block. | |
12252 | ||
12253 | try-block: | |
12254 | try compound-statement handler-seq */ | |
12255 | ||
12256 | static tree | |
94edc4ab | 12257 | cp_parser_try_block (cp_parser* parser) |
a723baf1 MM |
12258 | { |
12259 | tree try_block; | |
12260 | ||
12261 | cp_parser_require_keyword (parser, RID_TRY, "`try'"); | |
12262 | try_block = begin_try_block (); | |
12263 | cp_parser_compound_statement (parser); | |
12264 | finish_try_block (try_block); | |
12265 | cp_parser_handler_seq (parser); | |
12266 | finish_handler_sequence (try_block); | |
12267 | ||
12268 | return try_block; | |
12269 | } | |
12270 | ||
12271 | /* Parse a function-try-block. | |
12272 | ||
12273 | function-try-block: | |
12274 | try ctor-initializer [opt] function-body handler-seq */ | |
12275 | ||
12276 | static bool | |
94edc4ab | 12277 | cp_parser_function_try_block (cp_parser* parser) |
a723baf1 MM |
12278 | { |
12279 | tree try_block; | |
12280 | bool ctor_initializer_p; | |
12281 | ||
12282 | /* Look for the `try' keyword. */ | |
12283 | if (!cp_parser_require_keyword (parser, RID_TRY, "`try'")) | |
12284 | return false; | |
12285 | /* Let the rest of the front-end know where we are. */ | |
12286 | try_block = begin_function_try_block (); | |
12287 | /* Parse the function-body. */ | |
12288 | ctor_initializer_p | |
12289 | = cp_parser_ctor_initializer_opt_and_function_body (parser); | |
12290 | /* We're done with the `try' part. */ | |
12291 | finish_function_try_block (try_block); | |
12292 | /* Parse the handlers. */ | |
12293 | cp_parser_handler_seq (parser); | |
12294 | /* We're done with the handlers. */ | |
12295 | finish_function_handler_sequence (try_block); | |
12296 | ||
12297 | return ctor_initializer_p; | |
12298 | } | |
12299 | ||
12300 | /* Parse a handler-seq. | |
12301 | ||
12302 | handler-seq: | |
12303 | handler handler-seq [opt] */ | |
12304 | ||
12305 | static void | |
94edc4ab | 12306 | cp_parser_handler_seq (cp_parser* parser) |
a723baf1 MM |
12307 | { |
12308 | while (true) | |
12309 | { | |
12310 | cp_token *token; | |
12311 | ||
12312 | /* Parse the handler. */ | |
12313 | cp_parser_handler (parser); | |
12314 | /* Peek at the next token. */ | |
12315 | token = cp_lexer_peek_token (parser->lexer); | |
12316 | /* If it's not `catch' then there are no more handlers. */ | |
12317 | if (!cp_parser_is_keyword (token, RID_CATCH)) | |
12318 | break; | |
12319 | } | |
12320 | } | |
12321 | ||
12322 | /* Parse a handler. | |
12323 | ||
12324 | handler: | |
12325 | catch ( exception-declaration ) compound-statement */ | |
12326 | ||
12327 | static void | |
94edc4ab | 12328 | cp_parser_handler (cp_parser* parser) |
a723baf1 MM |
12329 | { |
12330 | tree handler; | |
12331 | tree declaration; | |
12332 | ||
12333 | cp_parser_require_keyword (parser, RID_CATCH, "`catch'"); | |
12334 | handler = begin_handler (); | |
12335 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12336 | declaration = cp_parser_exception_declaration (parser); | |
12337 | finish_handler_parms (declaration, handler); | |
12338 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12339 | cp_parser_compound_statement (parser); | |
12340 | finish_handler (handler); | |
12341 | } | |
12342 | ||
12343 | /* Parse an exception-declaration. | |
12344 | ||
12345 | exception-declaration: | |
12346 | type-specifier-seq declarator | |
12347 | type-specifier-seq abstract-declarator | |
12348 | type-specifier-seq | |
12349 | ... | |
12350 | ||
12351 | Returns a VAR_DECL for the declaration, or NULL_TREE if the | |
12352 | ellipsis variant is used. */ | |
12353 | ||
12354 | static tree | |
94edc4ab | 12355 | cp_parser_exception_declaration (cp_parser* parser) |
a723baf1 MM |
12356 | { |
12357 | tree type_specifiers; | |
12358 | tree declarator; | |
12359 | const char *saved_message; | |
12360 | ||
12361 | /* If it's an ellipsis, it's easy to handle. */ | |
12362 | if (cp_lexer_next_token_is (parser->lexer, CPP_ELLIPSIS)) | |
12363 | { | |
12364 | /* Consume the `...' token. */ | |
12365 | cp_lexer_consume_token (parser->lexer); | |
12366 | return NULL_TREE; | |
12367 | } | |
12368 | ||
12369 | /* Types may not be defined in exception-declarations. */ | |
12370 | saved_message = parser->type_definition_forbidden_message; | |
12371 | parser->type_definition_forbidden_message | |
12372 | = "types may not be defined in exception-declarations"; | |
12373 | ||
12374 | /* Parse the type-specifier-seq. */ | |
12375 | type_specifiers = cp_parser_type_specifier_seq (parser); | |
12376 | /* If it's a `)', then there is no declarator. */ | |
12377 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_PAREN)) | |
12378 | declarator = NULL_TREE; | |
12379 | else | |
62b8a44e NS |
12380 | declarator = cp_parser_declarator (parser, CP_PARSER_DECLARATOR_EITHER, |
12381 | /*ctor_dtor_or_conv_p=*/NULL); | |
a723baf1 MM |
12382 | |
12383 | /* Restore the saved message. */ | |
12384 | parser->type_definition_forbidden_message = saved_message; | |
12385 | ||
12386 | return start_handler_parms (type_specifiers, declarator); | |
12387 | } | |
12388 | ||
12389 | /* Parse a throw-expression. | |
12390 | ||
12391 | throw-expression: | |
34cd5ae7 | 12392 | throw assignment-expression [opt] |
a723baf1 MM |
12393 | |
12394 | Returns a THROW_EXPR representing the throw-expression. */ | |
12395 | ||
12396 | static tree | |
94edc4ab | 12397 | cp_parser_throw_expression (cp_parser* parser) |
a723baf1 MM |
12398 | { |
12399 | tree expression; | |
12400 | ||
12401 | cp_parser_require_keyword (parser, RID_THROW, "`throw'"); | |
12402 | /* We can't be sure if there is an assignment-expression or not. */ | |
12403 | cp_parser_parse_tentatively (parser); | |
12404 | /* Try it. */ | |
12405 | expression = cp_parser_assignment_expression (parser); | |
12406 | /* If it didn't work, this is just a rethrow. */ | |
12407 | if (!cp_parser_parse_definitely (parser)) | |
12408 | expression = NULL_TREE; | |
12409 | ||
12410 | return build_throw (expression); | |
12411 | } | |
12412 | ||
12413 | /* GNU Extensions */ | |
12414 | ||
12415 | /* Parse an (optional) asm-specification. | |
12416 | ||
12417 | asm-specification: | |
12418 | asm ( string-literal ) | |
12419 | ||
12420 | If the asm-specification is present, returns a STRING_CST | |
12421 | corresponding to the string-literal. Otherwise, returns | |
12422 | NULL_TREE. */ | |
12423 | ||
12424 | static tree | |
94edc4ab | 12425 | cp_parser_asm_specification_opt (cp_parser* parser) |
a723baf1 MM |
12426 | { |
12427 | cp_token *token; | |
12428 | tree asm_specification; | |
12429 | ||
12430 | /* Peek at the next token. */ | |
12431 | token = cp_lexer_peek_token (parser->lexer); | |
12432 | /* If the next token isn't the `asm' keyword, then there's no | |
12433 | asm-specification. */ | |
12434 | if (!cp_parser_is_keyword (token, RID_ASM)) | |
12435 | return NULL_TREE; | |
12436 | ||
12437 | /* Consume the `asm' token. */ | |
12438 | cp_lexer_consume_token (parser->lexer); | |
12439 | /* Look for the `('. */ | |
12440 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12441 | ||
12442 | /* Look for the string-literal. */ | |
12443 | token = cp_parser_require (parser, CPP_STRING, "string-literal"); | |
12444 | if (token) | |
12445 | asm_specification = token->value; | |
12446 | else | |
12447 | asm_specification = NULL_TREE; | |
12448 | ||
12449 | /* Look for the `)'. */ | |
12450 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`('"); | |
12451 | ||
12452 | return asm_specification; | |
12453 | } | |
12454 | ||
12455 | /* Parse an asm-operand-list. | |
12456 | ||
12457 | asm-operand-list: | |
12458 | asm-operand | |
12459 | asm-operand-list , asm-operand | |
12460 | ||
12461 | asm-operand: | |
12462 | string-literal ( expression ) | |
12463 | [ string-literal ] string-literal ( expression ) | |
12464 | ||
12465 | Returns a TREE_LIST representing the operands. The TREE_VALUE of | |
12466 | each node is the expression. The TREE_PURPOSE is itself a | |
12467 | TREE_LIST whose TREE_PURPOSE is a STRING_CST for the bracketed | |
12468 | string-literal (or NULL_TREE if not present) and whose TREE_VALUE | |
12469 | is a STRING_CST for the string literal before the parenthesis. */ | |
12470 | ||
12471 | static tree | |
94edc4ab | 12472 | cp_parser_asm_operand_list (cp_parser* parser) |
a723baf1 MM |
12473 | { |
12474 | tree asm_operands = NULL_TREE; | |
12475 | ||
12476 | while (true) | |
12477 | { | |
12478 | tree string_literal; | |
12479 | tree expression; | |
12480 | tree name; | |
12481 | cp_token *token; | |
12482 | ||
12483 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE)) | |
12484 | { | |
12485 | /* Consume the `[' token. */ | |
12486 | cp_lexer_consume_token (parser->lexer); | |
12487 | /* Read the operand name. */ | |
12488 | name = cp_parser_identifier (parser); | |
12489 | if (name != error_mark_node) | |
12490 | name = build_string (IDENTIFIER_LENGTH (name), | |
12491 | IDENTIFIER_POINTER (name)); | |
12492 | /* Look for the closing `]'. */ | |
12493 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
12494 | } | |
12495 | else | |
12496 | name = NULL_TREE; | |
12497 | /* Look for the string-literal. */ | |
12498 | token = cp_parser_require (parser, CPP_STRING, "string-literal"); | |
12499 | string_literal = token ? token->value : error_mark_node; | |
12500 | /* Look for the `('. */ | |
12501 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12502 | /* Parse the expression. */ | |
12503 | expression = cp_parser_expression (parser); | |
12504 | /* Look for the `)'. */ | |
12505 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12506 | /* Add this operand to the list. */ | |
12507 | asm_operands = tree_cons (build_tree_list (name, string_literal), | |
12508 | expression, | |
12509 | asm_operands); | |
12510 | /* If the next token is not a `,', there are no more | |
12511 | operands. */ | |
12512 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
12513 | break; | |
12514 | /* Consume the `,'. */ | |
12515 | cp_lexer_consume_token (parser->lexer); | |
12516 | } | |
12517 | ||
12518 | return nreverse (asm_operands); | |
12519 | } | |
12520 | ||
12521 | /* Parse an asm-clobber-list. | |
12522 | ||
12523 | asm-clobber-list: | |
12524 | string-literal | |
12525 | asm-clobber-list , string-literal | |
12526 | ||
12527 | Returns a TREE_LIST, indicating the clobbers in the order that they | |
12528 | appeared. The TREE_VALUE of each node is a STRING_CST. */ | |
12529 | ||
12530 | static tree | |
94edc4ab | 12531 | cp_parser_asm_clobber_list (cp_parser* parser) |
a723baf1 MM |
12532 | { |
12533 | tree clobbers = NULL_TREE; | |
12534 | ||
12535 | while (true) | |
12536 | { | |
12537 | cp_token *token; | |
12538 | tree string_literal; | |
12539 | ||
12540 | /* Look for the string literal. */ | |
12541 | token = cp_parser_require (parser, CPP_STRING, "string-literal"); | |
12542 | string_literal = token ? token->value : error_mark_node; | |
12543 | /* Add it to the list. */ | |
12544 | clobbers = tree_cons (NULL_TREE, string_literal, clobbers); | |
12545 | /* If the next token is not a `,', then the list is | |
12546 | complete. */ | |
12547 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
12548 | break; | |
12549 | /* Consume the `,' token. */ | |
12550 | cp_lexer_consume_token (parser->lexer); | |
12551 | } | |
12552 | ||
12553 | return clobbers; | |
12554 | } | |
12555 | ||
12556 | /* Parse an (optional) series of attributes. | |
12557 | ||
12558 | attributes: | |
12559 | attributes attribute | |
12560 | ||
12561 | attribute: | |
12562 | __attribute__ (( attribute-list [opt] )) | |
12563 | ||
12564 | The return value is as for cp_parser_attribute_list. */ | |
12565 | ||
12566 | static tree | |
94edc4ab | 12567 | cp_parser_attributes_opt (cp_parser* parser) |
a723baf1 MM |
12568 | { |
12569 | tree attributes = NULL_TREE; | |
12570 | ||
12571 | while (true) | |
12572 | { | |
12573 | cp_token *token; | |
12574 | tree attribute_list; | |
12575 | ||
12576 | /* Peek at the next token. */ | |
12577 | token = cp_lexer_peek_token (parser->lexer); | |
12578 | /* If it's not `__attribute__', then we're done. */ | |
12579 | if (token->keyword != RID_ATTRIBUTE) | |
12580 | break; | |
12581 | ||
12582 | /* Consume the `__attribute__' keyword. */ | |
12583 | cp_lexer_consume_token (parser->lexer); | |
12584 | /* Look for the two `(' tokens. */ | |
12585 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12586 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12587 | ||
12588 | /* Peek at the next token. */ | |
12589 | token = cp_lexer_peek_token (parser->lexer); | |
12590 | if (token->type != CPP_CLOSE_PAREN) | |
12591 | /* Parse the attribute-list. */ | |
12592 | attribute_list = cp_parser_attribute_list (parser); | |
12593 | else | |
12594 | /* If the next token is a `)', then there is no attribute | |
12595 | list. */ | |
12596 | attribute_list = NULL; | |
12597 | ||
12598 | /* Look for the two `)' tokens. */ | |
12599 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12600 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12601 | ||
12602 | /* Add these new attributes to the list. */ | |
12603 | attributes = chainon (attributes, attribute_list); | |
12604 | } | |
12605 | ||
12606 | return attributes; | |
12607 | } | |
12608 | ||
12609 | /* Parse an attribute-list. | |
12610 | ||
12611 | attribute-list: | |
12612 | attribute | |
12613 | attribute-list , attribute | |
12614 | ||
12615 | attribute: | |
12616 | identifier | |
12617 | identifier ( identifier ) | |
12618 | identifier ( identifier , expression-list ) | |
12619 | identifier ( expression-list ) | |
12620 | ||
12621 | Returns a TREE_LIST. Each node corresponds to an attribute. THe | |
12622 | TREE_PURPOSE of each node is the identifier indicating which | |
12623 | attribute is in use. The TREE_VALUE represents the arguments, if | |
12624 | any. */ | |
12625 | ||
12626 | static tree | |
94edc4ab | 12627 | cp_parser_attribute_list (cp_parser* parser) |
a723baf1 MM |
12628 | { |
12629 | tree attribute_list = NULL_TREE; | |
12630 | ||
12631 | while (true) | |
12632 | { | |
12633 | cp_token *token; | |
12634 | tree identifier; | |
12635 | tree attribute; | |
12636 | ||
12637 | /* Look for the identifier. We also allow keywords here; for | |
12638 | example `__attribute__ ((const))' is legal. */ | |
12639 | token = cp_lexer_peek_token (parser->lexer); | |
12640 | if (token->type != CPP_NAME | |
12641 | && token->type != CPP_KEYWORD) | |
12642 | return error_mark_node; | |
12643 | /* Consume the token. */ | |
12644 | token = cp_lexer_consume_token (parser->lexer); | |
12645 | ||
12646 | /* Save away the identifier that indicates which attribute this is. */ | |
12647 | identifier = token->value; | |
12648 | attribute = build_tree_list (identifier, NULL_TREE); | |
12649 | ||
12650 | /* Peek at the next token. */ | |
12651 | token = cp_lexer_peek_token (parser->lexer); | |
12652 | /* If it's an `(', then parse the attribute arguments. */ | |
12653 | if (token->type == CPP_OPEN_PAREN) | |
12654 | { | |
12655 | tree arguments; | |
a723baf1 | 12656 | |
39703eb9 MM |
12657 | arguments = (cp_parser_parenthesized_expression_list |
12658 | (parser, true, /*non_constant_p=*/NULL)); | |
a723baf1 MM |
12659 | /* Save the identifier and arguments away. */ |
12660 | TREE_VALUE (attribute) = arguments; | |
a723baf1 MM |
12661 | } |
12662 | ||
12663 | /* Add this attribute to the list. */ | |
12664 | TREE_CHAIN (attribute) = attribute_list; | |
12665 | attribute_list = attribute; | |
12666 | ||
12667 | /* Now, look for more attributes. */ | |
12668 | token = cp_lexer_peek_token (parser->lexer); | |
12669 | /* If the next token isn't a `,', we're done. */ | |
12670 | if (token->type != CPP_COMMA) | |
12671 | break; | |
12672 | ||
12673 | /* Consume the commma and keep going. */ | |
12674 | cp_lexer_consume_token (parser->lexer); | |
12675 | } | |
12676 | ||
12677 | /* We built up the list in reverse order. */ | |
12678 | return nreverse (attribute_list); | |
12679 | } | |
12680 | ||
12681 | /* Parse an optional `__extension__' keyword. Returns TRUE if it is | |
12682 | present, and FALSE otherwise. *SAVED_PEDANTIC is set to the | |
12683 | current value of the PEDANTIC flag, regardless of whether or not | |
12684 | the `__extension__' keyword is present. The caller is responsible | |
12685 | for restoring the value of the PEDANTIC flag. */ | |
12686 | ||
12687 | static bool | |
94edc4ab | 12688 | cp_parser_extension_opt (cp_parser* parser, int* saved_pedantic) |
a723baf1 MM |
12689 | { |
12690 | /* Save the old value of the PEDANTIC flag. */ | |
12691 | *saved_pedantic = pedantic; | |
12692 | ||
12693 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_EXTENSION)) | |
12694 | { | |
12695 | /* Consume the `__extension__' token. */ | |
12696 | cp_lexer_consume_token (parser->lexer); | |
12697 | /* We're not being pedantic while the `__extension__' keyword is | |
12698 | in effect. */ | |
12699 | pedantic = 0; | |
12700 | ||
12701 | return true; | |
12702 | } | |
12703 | ||
12704 | return false; | |
12705 | } | |
12706 | ||
12707 | /* Parse a label declaration. | |
12708 | ||
12709 | label-declaration: | |
12710 | __label__ label-declarator-seq ; | |
12711 | ||
12712 | label-declarator-seq: | |
12713 | identifier , label-declarator-seq | |
12714 | identifier */ | |
12715 | ||
12716 | static void | |
94edc4ab | 12717 | cp_parser_label_declaration (cp_parser* parser) |
a723baf1 MM |
12718 | { |
12719 | /* Look for the `__label__' keyword. */ | |
12720 | cp_parser_require_keyword (parser, RID_LABEL, "`__label__'"); | |
12721 | ||
12722 | while (true) | |
12723 | { | |
12724 | tree identifier; | |
12725 | ||
12726 | /* Look for an identifier. */ | |
12727 | identifier = cp_parser_identifier (parser); | |
12728 | /* Declare it as a lobel. */ | |
12729 | finish_label_decl (identifier); | |
12730 | /* If the next token is a `;', stop. */ | |
12731 | if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
12732 | break; | |
12733 | /* Look for the `,' separating the label declarations. */ | |
12734 | cp_parser_require (parser, CPP_COMMA, "`,'"); | |
12735 | } | |
12736 | ||
12737 | /* Look for the final `;'. */ | |
12738 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
12739 | } | |
12740 | ||
12741 | /* Support Functions */ | |
12742 | ||
12743 | /* Looks up NAME in the current scope, as given by PARSER->SCOPE. | |
12744 | NAME should have one of the representations used for an | |
12745 | id-expression. If NAME is the ERROR_MARK_NODE, the ERROR_MARK_NODE | |
12746 | is returned. If PARSER->SCOPE is a dependent type, then a | |
12747 | SCOPE_REF is returned. | |
12748 | ||
12749 | If NAME is a TEMPLATE_ID_EXPR, then it will be immediately | |
12750 | returned; the name was already resolved when the TEMPLATE_ID_EXPR | |
12751 | was formed. Abstractly, such entities should not be passed to this | |
12752 | function, because they do not need to be looked up, but it is | |
12753 | simpler to check for this special case here, rather than at the | |
12754 | call-sites. | |
12755 | ||
12756 | In cases not explicitly covered above, this function returns a | |
12757 | DECL, OVERLOAD, or baselink representing the result of the lookup. | |
12758 | If there was no entity with the indicated NAME, the ERROR_MARK_NODE | |
12759 | is returned. | |
12760 | ||
a723baf1 MM |
12761 | If IS_TYPE is TRUE, bindings that do not refer to types are |
12762 | ignored. | |
12763 | ||
eea9800f MM |
12764 | If IS_NAMESPACE is TRUE, bindings that do not refer to namespaces |
12765 | are ignored. | |
12766 | ||
a723baf1 MM |
12767 | If CHECK_DEPENDENCY is TRUE, names are not looked up in dependent |
12768 | types. */ | |
12769 | ||
12770 | static tree | |
8d241e0b | 12771 | cp_parser_lookup_name (cp_parser *parser, tree name, |
eea9800f | 12772 | bool is_type, bool is_namespace, bool check_dependency) |
a723baf1 MM |
12773 | { |
12774 | tree decl; | |
12775 | tree object_type = parser->context->object_type; | |
12776 | ||
12777 | /* Now that we have looked up the name, the OBJECT_TYPE (if any) is | |
12778 | no longer valid. Note that if we are parsing tentatively, and | |
12779 | the parse fails, OBJECT_TYPE will be automatically restored. */ | |
12780 | parser->context->object_type = NULL_TREE; | |
12781 | ||
12782 | if (name == error_mark_node) | |
12783 | return error_mark_node; | |
12784 | ||
12785 | /* A template-id has already been resolved; there is no lookup to | |
12786 | do. */ | |
12787 | if (TREE_CODE (name) == TEMPLATE_ID_EXPR) | |
12788 | return name; | |
12789 | if (BASELINK_P (name)) | |
12790 | { | |
12791 | my_friendly_assert ((TREE_CODE (BASELINK_FUNCTIONS (name)) | |
12792 | == TEMPLATE_ID_EXPR), | |
12793 | 20020909); | |
12794 | return name; | |
12795 | } | |
12796 | ||
12797 | /* A BIT_NOT_EXPR is used to represent a destructor. By this point, | |
12798 | it should already have been checked to make sure that the name | |
12799 | used matches the type being destroyed. */ | |
12800 | if (TREE_CODE (name) == BIT_NOT_EXPR) | |
12801 | { | |
12802 | tree type; | |
12803 | ||
12804 | /* Figure out to which type this destructor applies. */ | |
12805 | if (parser->scope) | |
12806 | type = parser->scope; | |
12807 | else if (object_type) | |
12808 | type = object_type; | |
12809 | else | |
12810 | type = current_class_type; | |
12811 | /* If that's not a class type, there is no destructor. */ | |
12812 | if (!type || !CLASS_TYPE_P (type)) | |
12813 | return error_mark_node; | |
12814 | /* If it was a class type, return the destructor. */ | |
12815 | return CLASSTYPE_DESTRUCTORS (type); | |
12816 | } | |
12817 | ||
12818 | /* By this point, the NAME should be an ordinary identifier. If | |
12819 | the id-expression was a qualified name, the qualifying scope is | |
12820 | stored in PARSER->SCOPE at this point. */ | |
12821 | my_friendly_assert (TREE_CODE (name) == IDENTIFIER_NODE, | |
12822 | 20000619); | |
12823 | ||
12824 | /* Perform the lookup. */ | |
12825 | if (parser->scope) | |
12826 | { | |
1fb3244a | 12827 | bool dependent_p; |
a723baf1 MM |
12828 | |
12829 | if (parser->scope == error_mark_node) | |
12830 | return error_mark_node; | |
12831 | ||
12832 | /* If the SCOPE is dependent, the lookup must be deferred until | |
12833 | the template is instantiated -- unless we are explicitly | |
12834 | looking up names in uninstantiated templates. Even then, we | |
12835 | cannot look up the name if the scope is not a class type; it | |
12836 | might, for example, be a template type parameter. */ | |
1fb3244a MM |
12837 | dependent_p = (TYPE_P (parser->scope) |
12838 | && !(parser->in_declarator_p | |
12839 | && currently_open_class (parser->scope)) | |
12840 | && dependent_type_p (parser->scope)); | |
a723baf1 | 12841 | if ((check_dependency || !CLASS_TYPE_P (parser->scope)) |
1fb3244a | 12842 | && dependent_p) |
a723baf1 MM |
12843 | { |
12844 | if (!is_type) | |
12845 | decl = build_nt (SCOPE_REF, parser->scope, name); | |
12846 | else | |
12847 | /* The resolution to Core Issue 180 says that `struct A::B' | |
12848 | should be considered a type-name, even if `A' is | |
12849 | dependent. */ | |
12850 | decl = TYPE_NAME (make_typename_type (parser->scope, | |
12851 | name, | |
12852 | /*complain=*/1)); | |
12853 | } | |
12854 | else | |
12855 | { | |
12856 | /* If PARSER->SCOPE is a dependent type, then it must be a | |
12857 | class type, and we must not be checking dependencies; | |
12858 | otherwise, we would have processed this lookup above. So | |
12859 | that PARSER->SCOPE is not considered a dependent base by | |
12860 | lookup_member, we must enter the scope here. */ | |
1fb3244a | 12861 | if (dependent_p) |
a723baf1 MM |
12862 | push_scope (parser->scope); |
12863 | /* If the PARSER->SCOPE is a a template specialization, it | |
12864 | may be instantiated during name lookup. In that case, | |
12865 | errors may be issued. Even if we rollback the current | |
12866 | tentative parse, those errors are valid. */ | |
5e08432e MM |
12867 | decl = lookup_qualified_name (parser->scope, name, is_type, |
12868 | /*complain=*/true); | |
1fb3244a | 12869 | if (dependent_p) |
a723baf1 MM |
12870 | pop_scope (parser->scope); |
12871 | } | |
12872 | parser->qualifying_scope = parser->scope; | |
12873 | parser->object_scope = NULL_TREE; | |
12874 | } | |
12875 | else if (object_type) | |
12876 | { | |
12877 | tree object_decl = NULL_TREE; | |
12878 | /* Look up the name in the scope of the OBJECT_TYPE, unless the | |
12879 | OBJECT_TYPE is not a class. */ | |
12880 | if (CLASS_TYPE_P (object_type)) | |
12881 | /* If the OBJECT_TYPE is a template specialization, it may | |
12882 | be instantiated during name lookup. In that case, errors | |
12883 | may be issued. Even if we rollback the current tentative | |
12884 | parse, those errors are valid. */ | |
12885 | object_decl = lookup_member (object_type, | |
12886 | name, | |
12887 | /*protect=*/0, is_type); | |
12888 | /* Look it up in the enclosing context, too. */ | |
12889 | decl = lookup_name_real (name, is_type, /*nonclass=*/0, | |
eea9800f | 12890 | is_namespace, |
a723baf1 MM |
12891 | /*flags=*/0); |
12892 | parser->object_scope = object_type; | |
12893 | parser->qualifying_scope = NULL_TREE; | |
12894 | if (object_decl) | |
12895 | decl = object_decl; | |
12896 | } | |
12897 | else | |
12898 | { | |
12899 | decl = lookup_name_real (name, is_type, /*nonclass=*/0, | |
eea9800f | 12900 | is_namespace, |
a723baf1 MM |
12901 | /*flags=*/0); |
12902 | parser->qualifying_scope = NULL_TREE; | |
12903 | parser->object_scope = NULL_TREE; | |
12904 | } | |
12905 | ||
12906 | /* If the lookup failed, let our caller know. */ | |
12907 | if (!decl | |
12908 | || decl == error_mark_node | |
12909 | || (TREE_CODE (decl) == FUNCTION_DECL | |
12910 | && DECL_ANTICIPATED (decl))) | |
12911 | return error_mark_node; | |
12912 | ||
12913 | /* If it's a TREE_LIST, the result of the lookup was ambiguous. */ | |
12914 | if (TREE_CODE (decl) == TREE_LIST) | |
12915 | { | |
12916 | /* The error message we have to print is too complicated for | |
12917 | cp_parser_error, so we incorporate its actions directly. */ | |
e5976695 | 12918 | if (!cp_parser_simulate_error (parser)) |
a723baf1 MM |
12919 | { |
12920 | error ("reference to `%D' is ambiguous", name); | |
12921 | print_candidates (decl); | |
12922 | } | |
12923 | return error_mark_node; | |
12924 | } | |
12925 | ||
12926 | my_friendly_assert (DECL_P (decl) | |
12927 | || TREE_CODE (decl) == OVERLOAD | |
12928 | || TREE_CODE (decl) == SCOPE_REF | |
12929 | || BASELINK_P (decl), | |
12930 | 20000619); | |
12931 | ||
12932 | /* If we have resolved the name of a member declaration, check to | |
12933 | see if the declaration is accessible. When the name resolves to | |
34cd5ae7 | 12934 | set of overloaded functions, accessibility is checked when |
a723baf1 MM |
12935 | overload resolution is done. |
12936 | ||
12937 | During an explicit instantiation, access is not checked at all, | |
12938 | as per [temp.explicit]. */ | |
8d241e0b | 12939 | if (DECL_P (decl)) |
ee76b931 | 12940 | check_accessibility_of_qualified_id (decl, object_type, parser->scope); |
a723baf1 MM |
12941 | |
12942 | return decl; | |
12943 | } | |
12944 | ||
12945 | /* Like cp_parser_lookup_name, but for use in the typical case where | |
12946 | CHECK_ACCESS is TRUE, IS_TYPE is FALSE, and CHECK_DEPENDENCY is | |
12947 | TRUE. */ | |
12948 | ||
12949 | static tree | |
94edc4ab | 12950 | cp_parser_lookup_name_simple (cp_parser* parser, tree name) |
a723baf1 MM |
12951 | { |
12952 | return cp_parser_lookup_name (parser, name, | |
eea9800f MM |
12953 | /*is_type=*/false, |
12954 | /*is_namespace=*/false, | |
a723baf1 MM |
12955 | /*check_dependency=*/true); |
12956 | } | |
12957 | ||
a723baf1 MM |
12958 | /* If DECL is a TEMPLATE_DECL that can be treated like a TYPE_DECL in |
12959 | the current context, return the TYPE_DECL. If TAG_NAME_P is | |
12960 | true, the DECL indicates the class being defined in a class-head, | |
12961 | or declared in an elaborated-type-specifier. | |
12962 | ||
12963 | Otherwise, return DECL. */ | |
12964 | ||
12965 | static tree | |
12966 | cp_parser_maybe_treat_template_as_class (tree decl, bool tag_name_p) | |
12967 | { | |
710b73e6 KL |
12968 | /* If the TEMPLATE_DECL is being declared as part of a class-head, |
12969 | the translation from TEMPLATE_DECL to TYPE_DECL occurs: | |
a723baf1 MM |
12970 | |
12971 | struct A { | |
12972 | template <typename T> struct B; | |
12973 | }; | |
12974 | ||
12975 | template <typename T> struct A::B {}; | |
12976 | ||
12977 | Similarly, in a elaborated-type-specifier: | |
12978 | ||
12979 | namespace N { struct X{}; } | |
12980 | ||
12981 | struct A { | |
12982 | template <typename T> friend struct N::X; | |
12983 | }; | |
12984 | ||
710b73e6 KL |
12985 | However, if the DECL refers to a class type, and we are in |
12986 | the scope of the class, then the name lookup automatically | |
12987 | finds the TYPE_DECL created by build_self_reference rather | |
12988 | than a TEMPLATE_DECL. For example, in: | |
12989 | ||
12990 | template <class T> struct S { | |
12991 | S s; | |
12992 | }; | |
12993 | ||
12994 | there is no need to handle such case. */ | |
12995 | ||
12996 | if (DECL_CLASS_TEMPLATE_P (decl) && tag_name_p) | |
a723baf1 MM |
12997 | return DECL_TEMPLATE_RESULT (decl); |
12998 | ||
12999 | return decl; | |
13000 | } | |
13001 | ||
13002 | /* If too many, or too few, template-parameter lists apply to the | |
13003 | declarator, issue an error message. Returns TRUE if all went well, | |
13004 | and FALSE otherwise. */ | |
13005 | ||
13006 | static bool | |
94edc4ab NN |
13007 | cp_parser_check_declarator_template_parameters (cp_parser* parser, |
13008 | tree declarator) | |
a723baf1 MM |
13009 | { |
13010 | unsigned num_templates; | |
13011 | ||
13012 | /* We haven't seen any classes that involve template parameters yet. */ | |
13013 | num_templates = 0; | |
13014 | ||
13015 | switch (TREE_CODE (declarator)) | |
13016 | { | |
13017 | case CALL_EXPR: | |
13018 | case ARRAY_REF: | |
13019 | case INDIRECT_REF: | |
13020 | case ADDR_EXPR: | |
13021 | { | |
13022 | tree main_declarator = TREE_OPERAND (declarator, 0); | |
13023 | return | |
13024 | cp_parser_check_declarator_template_parameters (parser, | |
13025 | main_declarator); | |
13026 | } | |
13027 | ||
13028 | case SCOPE_REF: | |
13029 | { | |
13030 | tree scope; | |
13031 | tree member; | |
13032 | ||
13033 | scope = TREE_OPERAND (declarator, 0); | |
13034 | member = TREE_OPERAND (declarator, 1); | |
13035 | ||
13036 | /* If this is a pointer-to-member, then we are not interested | |
13037 | in the SCOPE, because it does not qualify the thing that is | |
13038 | being declared. */ | |
13039 | if (TREE_CODE (member) == INDIRECT_REF) | |
13040 | return (cp_parser_check_declarator_template_parameters | |
13041 | (parser, member)); | |
13042 | ||
13043 | while (scope && CLASS_TYPE_P (scope)) | |
13044 | { | |
13045 | /* You're supposed to have one `template <...>' | |
13046 | for every template class, but you don't need one | |
13047 | for a full specialization. For example: | |
13048 | ||
13049 | template <class T> struct S{}; | |
13050 | template <> struct S<int> { void f(); }; | |
13051 | void S<int>::f () {} | |
13052 | ||
13053 | is correct; there shouldn't be a `template <>' for | |
13054 | the definition of `S<int>::f'. */ | |
13055 | if (CLASSTYPE_TEMPLATE_INFO (scope) | |
13056 | && (CLASSTYPE_TEMPLATE_INSTANTIATION (scope) | |
13057 | || uses_template_parms (CLASSTYPE_TI_ARGS (scope))) | |
13058 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (scope))) | |
13059 | ++num_templates; | |
13060 | ||
13061 | scope = TYPE_CONTEXT (scope); | |
13062 | } | |
13063 | } | |
13064 | ||
13065 | /* Fall through. */ | |
13066 | ||
13067 | default: | |
13068 | /* If the DECLARATOR has the form `X<y>' then it uses one | |
13069 | additional level of template parameters. */ | |
13070 | if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) | |
13071 | ++num_templates; | |
13072 | ||
13073 | return cp_parser_check_template_parameters (parser, | |
13074 | num_templates); | |
13075 | } | |
13076 | } | |
13077 | ||
13078 | /* NUM_TEMPLATES were used in the current declaration. If that is | |
13079 | invalid, return FALSE and issue an error messages. Otherwise, | |
13080 | return TRUE. */ | |
13081 | ||
13082 | static bool | |
94edc4ab NN |
13083 | cp_parser_check_template_parameters (cp_parser* parser, |
13084 | unsigned num_templates) | |
a723baf1 MM |
13085 | { |
13086 | /* If there are more template classes than parameter lists, we have | |
13087 | something like: | |
13088 | ||
13089 | template <class T> void S<T>::R<T>::f (); */ | |
13090 | if (parser->num_template_parameter_lists < num_templates) | |
13091 | { | |
13092 | error ("too few template-parameter-lists"); | |
13093 | return false; | |
13094 | } | |
13095 | /* If there are the same number of template classes and parameter | |
13096 | lists, that's OK. */ | |
13097 | if (parser->num_template_parameter_lists == num_templates) | |
13098 | return true; | |
13099 | /* If there are more, but only one more, then we are referring to a | |
13100 | member template. That's OK too. */ | |
13101 | if (parser->num_template_parameter_lists == num_templates + 1) | |
13102 | return true; | |
13103 | /* Otherwise, there are too many template parameter lists. We have | |
13104 | something like: | |
13105 | ||
13106 | template <class T> template <class U> void S::f(); */ | |
13107 | error ("too many template-parameter-lists"); | |
13108 | return false; | |
13109 | } | |
13110 | ||
13111 | /* Parse a binary-expression of the general form: | |
13112 | ||
13113 | binary-expression: | |
13114 | <expr> | |
13115 | binary-expression <token> <expr> | |
13116 | ||
13117 | The TOKEN_TREE_MAP maps <token> types to <expr> codes. FN is used | |
13118 | to parser the <expr>s. If the first production is used, then the | |
13119 | value returned by FN is returned directly. Otherwise, a node with | |
13120 | the indicated EXPR_TYPE is returned, with operands corresponding to | |
13121 | the two sub-expressions. */ | |
13122 | ||
13123 | static tree | |
94edc4ab NN |
13124 | cp_parser_binary_expression (cp_parser* parser, |
13125 | const cp_parser_token_tree_map token_tree_map, | |
13126 | cp_parser_expression_fn fn) | |
a723baf1 MM |
13127 | { |
13128 | tree lhs; | |
13129 | ||
13130 | /* Parse the first expression. */ | |
13131 | lhs = (*fn) (parser); | |
13132 | /* Now, look for more expressions. */ | |
13133 | while (true) | |
13134 | { | |
13135 | cp_token *token; | |
39b1af70 | 13136 | const cp_parser_token_tree_map_node *map_node; |
a723baf1 MM |
13137 | tree rhs; |
13138 | ||
13139 | /* Peek at the next token. */ | |
13140 | token = cp_lexer_peek_token (parser->lexer); | |
13141 | /* If the token is `>', and that's not an operator at the | |
13142 | moment, then we're done. */ | |
13143 | if (token->type == CPP_GREATER | |
13144 | && !parser->greater_than_is_operator_p) | |
13145 | break; | |
34cd5ae7 | 13146 | /* If we find one of the tokens we want, build the corresponding |
a723baf1 MM |
13147 | tree representation. */ |
13148 | for (map_node = token_tree_map; | |
13149 | map_node->token_type != CPP_EOF; | |
13150 | ++map_node) | |
13151 | if (map_node->token_type == token->type) | |
13152 | { | |
13153 | /* Consume the operator token. */ | |
13154 | cp_lexer_consume_token (parser->lexer); | |
13155 | /* Parse the right-hand side of the expression. */ | |
13156 | rhs = (*fn) (parser); | |
13157 | /* Build the binary tree node. */ | |
13158 | lhs = build_x_binary_op (map_node->tree_type, lhs, rhs); | |
13159 | break; | |
13160 | } | |
13161 | ||
13162 | /* If the token wasn't one of the ones we want, we're done. */ | |
13163 | if (map_node->token_type == CPP_EOF) | |
13164 | break; | |
13165 | } | |
13166 | ||
13167 | return lhs; | |
13168 | } | |
13169 | ||
13170 | /* Parse an optional `::' token indicating that the following name is | |
13171 | from the global namespace. If so, PARSER->SCOPE is set to the | |
13172 | GLOBAL_NAMESPACE. Otherwise, PARSER->SCOPE is set to NULL_TREE, | |
13173 | unless CURRENT_SCOPE_VALID_P is TRUE, in which case it is left alone. | |
13174 | Returns the new value of PARSER->SCOPE, if the `::' token is | |
13175 | present, and NULL_TREE otherwise. */ | |
13176 | ||
13177 | static tree | |
94edc4ab | 13178 | cp_parser_global_scope_opt (cp_parser* parser, bool current_scope_valid_p) |
a723baf1 MM |
13179 | { |
13180 | cp_token *token; | |
13181 | ||
13182 | /* Peek at the next token. */ | |
13183 | token = cp_lexer_peek_token (parser->lexer); | |
13184 | /* If we're looking at a `::' token then we're starting from the | |
13185 | global namespace, not our current location. */ | |
13186 | if (token->type == CPP_SCOPE) | |
13187 | { | |
13188 | /* Consume the `::' token. */ | |
13189 | cp_lexer_consume_token (parser->lexer); | |
13190 | /* Set the SCOPE so that we know where to start the lookup. */ | |
13191 | parser->scope = global_namespace; | |
13192 | parser->qualifying_scope = global_namespace; | |
13193 | parser->object_scope = NULL_TREE; | |
13194 | ||
13195 | return parser->scope; | |
13196 | } | |
13197 | else if (!current_scope_valid_p) | |
13198 | { | |
13199 | parser->scope = NULL_TREE; | |
13200 | parser->qualifying_scope = NULL_TREE; | |
13201 | parser->object_scope = NULL_TREE; | |
13202 | } | |
13203 | ||
13204 | return NULL_TREE; | |
13205 | } | |
13206 | ||
13207 | /* Returns TRUE if the upcoming token sequence is the start of a | |
13208 | constructor declarator. If FRIEND_P is true, the declarator is | |
13209 | preceded by the `friend' specifier. */ | |
13210 | ||
13211 | static bool | |
13212 | cp_parser_constructor_declarator_p (cp_parser *parser, bool friend_p) | |
13213 | { | |
13214 | bool constructor_p; | |
13215 | tree type_decl = NULL_TREE; | |
13216 | bool nested_name_p; | |
2050a1bb MM |
13217 | cp_token *next_token; |
13218 | ||
13219 | /* The common case is that this is not a constructor declarator, so | |
8fbc5ae7 MM |
13220 | try to avoid doing lots of work if at all possible. It's not |
13221 | valid declare a constructor at function scope. */ | |
13222 | if (at_function_scope_p ()) | |
13223 | return false; | |
13224 | /* And only certain tokens can begin a constructor declarator. */ | |
2050a1bb MM |
13225 | next_token = cp_lexer_peek_token (parser->lexer); |
13226 | if (next_token->type != CPP_NAME | |
13227 | && next_token->type != CPP_SCOPE | |
13228 | && next_token->type != CPP_NESTED_NAME_SPECIFIER | |
13229 | && next_token->type != CPP_TEMPLATE_ID) | |
13230 | return false; | |
a723baf1 MM |
13231 | |
13232 | /* Parse tentatively; we are going to roll back all of the tokens | |
13233 | consumed here. */ | |
13234 | cp_parser_parse_tentatively (parser); | |
13235 | /* Assume that we are looking at a constructor declarator. */ | |
13236 | constructor_p = true; | |
8d241e0b | 13237 | |
a723baf1 MM |
13238 | /* Look for the optional `::' operator. */ |
13239 | cp_parser_global_scope_opt (parser, | |
13240 | /*current_scope_valid_p=*/false); | |
13241 | /* Look for the nested-name-specifier. */ | |
13242 | nested_name_p | |
13243 | = (cp_parser_nested_name_specifier_opt (parser, | |
13244 | /*typename_keyword_p=*/false, | |
13245 | /*check_dependency_p=*/false, | |
13246 | /*type_p=*/false) | |
13247 | != NULL_TREE); | |
13248 | /* Outside of a class-specifier, there must be a | |
13249 | nested-name-specifier. */ | |
13250 | if (!nested_name_p && | |
13251 | (!at_class_scope_p () || !TYPE_BEING_DEFINED (current_class_type) | |
13252 | || friend_p)) | |
13253 | constructor_p = false; | |
13254 | /* If we still think that this might be a constructor-declarator, | |
13255 | look for a class-name. */ | |
13256 | if (constructor_p) | |
13257 | { | |
13258 | /* If we have: | |
13259 | ||
8fbc5ae7 | 13260 | template <typename T> struct S { S(); }; |
a723baf1 MM |
13261 | template <typename T> S<T>::S (); |
13262 | ||
13263 | we must recognize that the nested `S' names a class. | |
13264 | Similarly, for: | |
13265 | ||
13266 | template <typename T> S<T>::S<T> (); | |
13267 | ||
13268 | we must recognize that the nested `S' names a template. */ | |
13269 | type_decl = cp_parser_class_name (parser, | |
13270 | /*typename_keyword_p=*/false, | |
13271 | /*template_keyword_p=*/false, | |
13272 | /*type_p=*/false, | |
a723baf1 MM |
13273 | /*check_dependency_p=*/false, |
13274 | /*class_head_p=*/false); | |
13275 | /* If there was no class-name, then this is not a constructor. */ | |
13276 | constructor_p = !cp_parser_error_occurred (parser); | |
13277 | } | |
8d241e0b | 13278 | |
a723baf1 MM |
13279 | /* If we're still considering a constructor, we have to see a `(', |
13280 | to begin the parameter-declaration-clause, followed by either a | |
13281 | `)', an `...', or a decl-specifier. We need to check for a | |
13282 | type-specifier to avoid being fooled into thinking that: | |
13283 | ||
13284 | S::S (f) (int); | |
13285 | ||
13286 | is a constructor. (It is actually a function named `f' that | |
13287 | takes one parameter (of type `int') and returns a value of type | |
13288 | `S::S'. */ | |
13289 | if (constructor_p | |
13290 | && cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) | |
13291 | { | |
13292 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_PAREN) | |
13293 | && cp_lexer_next_token_is_not (parser->lexer, CPP_ELLIPSIS) | |
13294 | && !cp_parser_storage_class_specifier_opt (parser)) | |
13295 | { | |
5dae1114 MM |
13296 | tree type; |
13297 | ||
13298 | /* Names appearing in the type-specifier should be looked up | |
13299 | in the scope of the class. */ | |
13300 | if (current_class_type) | |
13301 | type = NULL_TREE; | |
a723baf1 MM |
13302 | else |
13303 | { | |
5dae1114 MM |
13304 | type = TREE_TYPE (type_decl); |
13305 | if (TREE_CODE (type) == TYPENAME_TYPE) | |
14d22dd6 MM |
13306 | { |
13307 | type = resolve_typename_type (type, | |
13308 | /*only_current_p=*/false); | |
13309 | if (type == error_mark_node) | |
13310 | { | |
13311 | cp_parser_abort_tentative_parse (parser); | |
13312 | return false; | |
13313 | } | |
13314 | } | |
5dae1114 | 13315 | push_scope (type); |
a723baf1 | 13316 | } |
5dae1114 MM |
13317 | /* Look for the type-specifier. */ |
13318 | cp_parser_type_specifier (parser, | |
13319 | CP_PARSER_FLAGS_NONE, | |
13320 | /*is_friend=*/false, | |
13321 | /*is_declarator=*/true, | |
13322 | /*declares_class_or_enum=*/NULL, | |
13323 | /*is_cv_qualifier=*/NULL); | |
13324 | /* Leave the scope of the class. */ | |
13325 | if (type) | |
13326 | pop_scope (type); | |
13327 | ||
13328 | constructor_p = !cp_parser_error_occurred (parser); | |
a723baf1 MM |
13329 | } |
13330 | } | |
13331 | else | |
13332 | constructor_p = false; | |
13333 | /* We did not really want to consume any tokens. */ | |
13334 | cp_parser_abort_tentative_parse (parser); | |
13335 | ||
13336 | return constructor_p; | |
13337 | } | |
13338 | ||
13339 | /* Parse the definition of the function given by the DECL_SPECIFIERS, | |
cf22909c | 13340 | ATTRIBUTES, and DECLARATOR. The access checks have been deferred; |
a723baf1 MM |
13341 | they must be performed once we are in the scope of the function. |
13342 | ||
13343 | Returns the function defined. */ | |
13344 | ||
13345 | static tree | |
13346 | cp_parser_function_definition_from_specifiers_and_declarator | |
94edc4ab NN |
13347 | (cp_parser* parser, |
13348 | tree decl_specifiers, | |
13349 | tree attributes, | |
13350 | tree declarator) | |
a723baf1 MM |
13351 | { |
13352 | tree fn; | |
13353 | bool success_p; | |
13354 | ||
13355 | /* Begin the function-definition. */ | |
13356 | success_p = begin_function_definition (decl_specifiers, | |
13357 | attributes, | |
13358 | declarator); | |
13359 | ||
13360 | /* If there were names looked up in the decl-specifier-seq that we | |
13361 | did not check, check them now. We must wait until we are in the | |
13362 | scope of the function to perform the checks, since the function | |
13363 | might be a friend. */ | |
cf22909c | 13364 | perform_deferred_access_checks (); |
a723baf1 MM |
13365 | |
13366 | if (!success_p) | |
13367 | { | |
13368 | /* If begin_function_definition didn't like the definition, skip | |
13369 | the entire function. */ | |
13370 | error ("invalid function declaration"); | |
13371 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
13372 | fn = error_mark_node; | |
13373 | } | |
13374 | else | |
13375 | fn = cp_parser_function_definition_after_declarator (parser, | |
13376 | /*inline_p=*/false); | |
13377 | ||
13378 | return fn; | |
13379 | } | |
13380 | ||
13381 | /* Parse the part of a function-definition that follows the | |
13382 | declarator. INLINE_P is TRUE iff this function is an inline | |
13383 | function defined with a class-specifier. | |
13384 | ||
13385 | Returns the function defined. */ | |
13386 | ||
13387 | static tree | |
94edc4ab NN |
13388 | cp_parser_function_definition_after_declarator (cp_parser* parser, |
13389 | bool inline_p) | |
a723baf1 MM |
13390 | { |
13391 | tree fn; | |
13392 | bool ctor_initializer_p = false; | |
13393 | bool saved_in_unbraced_linkage_specification_p; | |
13394 | unsigned saved_num_template_parameter_lists; | |
13395 | ||
13396 | /* If the next token is `return', then the code may be trying to | |
13397 | make use of the "named return value" extension that G++ used to | |
13398 | support. */ | |
13399 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_RETURN)) | |
13400 | { | |
13401 | /* Consume the `return' keyword. */ | |
13402 | cp_lexer_consume_token (parser->lexer); | |
13403 | /* Look for the identifier that indicates what value is to be | |
13404 | returned. */ | |
13405 | cp_parser_identifier (parser); | |
13406 | /* Issue an error message. */ | |
13407 | error ("named return values are no longer supported"); | |
13408 | /* Skip tokens until we reach the start of the function body. */ | |
13409 | while (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_BRACE)) | |
13410 | cp_lexer_consume_token (parser->lexer); | |
13411 | } | |
13412 | /* The `extern' in `extern "C" void f () { ... }' does not apply to | |
13413 | anything declared inside `f'. */ | |
13414 | saved_in_unbraced_linkage_specification_p | |
13415 | = parser->in_unbraced_linkage_specification_p; | |
13416 | parser->in_unbraced_linkage_specification_p = false; | |
13417 | /* Inside the function, surrounding template-parameter-lists do not | |
13418 | apply. */ | |
13419 | saved_num_template_parameter_lists | |
13420 | = parser->num_template_parameter_lists; | |
13421 | parser->num_template_parameter_lists = 0; | |
13422 | /* If the next token is `try', then we are looking at a | |
13423 | function-try-block. */ | |
13424 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TRY)) | |
13425 | ctor_initializer_p = cp_parser_function_try_block (parser); | |
13426 | /* A function-try-block includes the function-body, so we only do | |
13427 | this next part if we're not processing a function-try-block. */ | |
13428 | else | |
13429 | ctor_initializer_p | |
13430 | = cp_parser_ctor_initializer_opt_and_function_body (parser); | |
13431 | ||
13432 | /* Finish the function. */ | |
13433 | fn = finish_function ((ctor_initializer_p ? 1 : 0) | | |
13434 | (inline_p ? 2 : 0)); | |
13435 | /* Generate code for it, if necessary. */ | |
8cd2462c | 13436 | expand_or_defer_fn (fn); |
a723baf1 MM |
13437 | /* Restore the saved values. */ |
13438 | parser->in_unbraced_linkage_specification_p | |
13439 | = saved_in_unbraced_linkage_specification_p; | |
13440 | parser->num_template_parameter_lists | |
13441 | = saved_num_template_parameter_lists; | |
13442 | ||
13443 | return fn; | |
13444 | } | |
13445 | ||
13446 | /* Parse a template-declaration, assuming that the `export' (and | |
13447 | `extern') keywords, if present, has already been scanned. MEMBER_P | |
13448 | is as for cp_parser_template_declaration. */ | |
13449 | ||
13450 | static void | |
94edc4ab | 13451 | cp_parser_template_declaration_after_export (cp_parser* parser, bool member_p) |
a723baf1 MM |
13452 | { |
13453 | tree decl = NULL_TREE; | |
13454 | tree parameter_list; | |
13455 | bool friend_p = false; | |
13456 | ||
13457 | /* Look for the `template' keyword. */ | |
13458 | if (!cp_parser_require_keyword (parser, RID_TEMPLATE, "`template'")) | |
13459 | return; | |
13460 | ||
13461 | /* And the `<'. */ | |
13462 | if (!cp_parser_require (parser, CPP_LESS, "`<'")) | |
13463 | return; | |
13464 | ||
13465 | /* Parse the template parameters. */ | |
13466 | begin_template_parm_list (); | |
13467 | /* If the next token is `>', then we have an invalid | |
13468 | specialization. Rather than complain about an invalid template | |
13469 | parameter, issue an error message here. */ | |
13470 | if (cp_lexer_next_token_is (parser->lexer, CPP_GREATER)) | |
13471 | { | |
13472 | cp_parser_error (parser, "invalid explicit specialization"); | |
13473 | parameter_list = NULL_TREE; | |
13474 | } | |
13475 | else | |
13476 | parameter_list = cp_parser_template_parameter_list (parser); | |
13477 | parameter_list = end_template_parm_list (parameter_list); | |
13478 | /* Look for the `>'. */ | |
13479 | cp_parser_skip_until_found (parser, CPP_GREATER, "`>'"); | |
13480 | /* We just processed one more parameter list. */ | |
13481 | ++parser->num_template_parameter_lists; | |
13482 | /* If the next token is `template', there are more template | |
13483 | parameters. */ | |
13484 | if (cp_lexer_next_token_is_keyword (parser->lexer, | |
13485 | RID_TEMPLATE)) | |
13486 | cp_parser_template_declaration_after_export (parser, member_p); | |
13487 | else | |
13488 | { | |
13489 | decl = cp_parser_single_declaration (parser, | |
13490 | member_p, | |
13491 | &friend_p); | |
13492 | ||
13493 | /* If this is a member template declaration, let the front | |
13494 | end know. */ | |
13495 | if (member_p && !friend_p && decl) | |
13496 | decl = finish_member_template_decl (decl); | |
13497 | else if (friend_p && decl && TREE_CODE (decl) == TYPE_DECL) | |
13498 | make_friend_class (current_class_type, TREE_TYPE (decl)); | |
13499 | } | |
13500 | /* We are done with the current parameter list. */ | |
13501 | --parser->num_template_parameter_lists; | |
13502 | ||
13503 | /* Finish up. */ | |
13504 | finish_template_decl (parameter_list); | |
13505 | ||
13506 | /* Register member declarations. */ | |
13507 | if (member_p && !friend_p && decl && !DECL_CLASS_TEMPLATE_P (decl)) | |
13508 | finish_member_declaration (decl); | |
13509 | ||
13510 | /* If DECL is a function template, we must return to parse it later. | |
13511 | (Even though there is no definition, there might be default | |
13512 | arguments that need handling.) */ | |
13513 | if (member_p && decl | |
13514 | && (TREE_CODE (decl) == FUNCTION_DECL | |
13515 | || DECL_FUNCTION_TEMPLATE_P (decl))) | |
13516 | TREE_VALUE (parser->unparsed_functions_queues) | |
8218bd34 | 13517 | = tree_cons (NULL_TREE, decl, |
a723baf1 MM |
13518 | TREE_VALUE (parser->unparsed_functions_queues)); |
13519 | } | |
13520 | ||
13521 | /* Parse a `decl-specifier-seq [opt] init-declarator [opt] ;' or | |
13522 | `function-definition' sequence. MEMBER_P is true, this declaration | |
13523 | appears in a class scope. | |
13524 | ||
13525 | Returns the DECL for the declared entity. If FRIEND_P is non-NULL, | |
13526 | *FRIEND_P is set to TRUE iff the declaration is a friend. */ | |
13527 | ||
13528 | static tree | |
94edc4ab NN |
13529 | cp_parser_single_declaration (cp_parser* parser, |
13530 | bool member_p, | |
13531 | bool* friend_p) | |
a723baf1 MM |
13532 | { |
13533 | bool declares_class_or_enum; | |
13534 | tree decl = NULL_TREE; | |
13535 | tree decl_specifiers; | |
13536 | tree attributes; | |
a723baf1 MM |
13537 | |
13538 | /* Parse the dependent declaration. We don't know yet | |
13539 | whether it will be a function-definition. */ | |
13540 | cp_parser_parse_tentatively (parser); | |
13541 | /* Defer access checks until we know what is being declared. */ | |
8d241e0b | 13542 | push_deferring_access_checks (dk_deferred); |
cf22909c | 13543 | |
a723baf1 MM |
13544 | /* Try the `decl-specifier-seq [opt] init-declarator [opt]' |
13545 | alternative. */ | |
13546 | decl_specifiers | |
13547 | = cp_parser_decl_specifier_seq (parser, | |
13548 | CP_PARSER_FLAGS_OPTIONAL, | |
13549 | &attributes, | |
13550 | &declares_class_or_enum); | |
13551 | /* Gather up the access checks that occurred the | |
13552 | decl-specifier-seq. */ | |
cf22909c KL |
13553 | stop_deferring_access_checks (); |
13554 | ||
a723baf1 MM |
13555 | /* Check for the declaration of a template class. */ |
13556 | if (declares_class_or_enum) | |
13557 | { | |
13558 | if (cp_parser_declares_only_class_p (parser)) | |
13559 | { | |
13560 | decl = shadow_tag (decl_specifiers); | |
13561 | if (decl) | |
13562 | decl = TYPE_NAME (decl); | |
13563 | else | |
13564 | decl = error_mark_node; | |
13565 | } | |
13566 | } | |
13567 | else | |
13568 | decl = NULL_TREE; | |
13569 | /* If it's not a template class, try for a template function. If | |
13570 | the next token is a `;', then this declaration does not declare | |
13571 | anything. But, if there were errors in the decl-specifiers, then | |
13572 | the error might well have come from an attempted class-specifier. | |
13573 | In that case, there's no need to warn about a missing declarator. */ | |
13574 | if (!decl | |
13575 | && (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON) | |
13576 | || !value_member (error_mark_node, decl_specifiers))) | |
13577 | decl = cp_parser_init_declarator (parser, | |
13578 | decl_specifiers, | |
13579 | attributes, | |
a723baf1 MM |
13580 | /*function_definition_allowed_p=*/false, |
13581 | member_p, | |
13582 | /*function_definition_p=*/NULL); | |
cf22909c KL |
13583 | |
13584 | pop_deferring_access_checks (); | |
13585 | ||
a723baf1 MM |
13586 | /* Clear any current qualification; whatever comes next is the start |
13587 | of something new. */ | |
13588 | parser->scope = NULL_TREE; | |
13589 | parser->qualifying_scope = NULL_TREE; | |
13590 | parser->object_scope = NULL_TREE; | |
13591 | /* Look for a trailing `;' after the declaration. */ | |
8a6393df | 13592 | if (!cp_parser_require (parser, CPP_SEMICOLON, "`;'") |
a723baf1 MM |
13593 | && cp_parser_committed_to_tentative_parse (parser)) |
13594 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
13595 | /* If it worked, set *FRIEND_P based on the DECL_SPECIFIERS. */ | |
13596 | if (cp_parser_parse_definitely (parser)) | |
13597 | { | |
13598 | if (friend_p) | |
13599 | *friend_p = cp_parser_friend_p (decl_specifiers); | |
13600 | } | |
13601 | /* Otherwise, try a function-definition. */ | |
13602 | else | |
13603 | decl = cp_parser_function_definition (parser, friend_p); | |
13604 | ||
13605 | return decl; | |
13606 | } | |
13607 | ||
d6b4ea85 MM |
13608 | /* Parse a cast-expression that is not the operand of a unary "&". */ |
13609 | ||
13610 | static tree | |
13611 | cp_parser_simple_cast_expression (cp_parser *parser) | |
13612 | { | |
13613 | return cp_parser_cast_expression (parser, /*address_p=*/false); | |
13614 | } | |
13615 | ||
a723baf1 MM |
13616 | /* Parse a functional cast to TYPE. Returns an expression |
13617 | representing the cast. */ | |
13618 | ||
13619 | static tree | |
94edc4ab | 13620 | cp_parser_functional_cast (cp_parser* parser, tree type) |
a723baf1 MM |
13621 | { |
13622 | tree expression_list; | |
13623 | ||
39703eb9 MM |
13624 | expression_list |
13625 | = cp_parser_parenthesized_expression_list (parser, false, | |
13626 | /*non_constant_p=*/NULL); | |
a723baf1 MM |
13627 | |
13628 | return build_functional_cast (type, expression_list); | |
13629 | } | |
13630 | ||
13631 | /* MEMBER_FUNCTION is a member function, or a friend. If default | |
13632 | arguments, or the body of the function have not yet been parsed, | |
13633 | parse them now. */ | |
13634 | ||
13635 | static void | |
94edc4ab | 13636 | cp_parser_late_parsing_for_member (cp_parser* parser, tree member_function) |
a723baf1 MM |
13637 | { |
13638 | cp_lexer *saved_lexer; | |
13639 | ||
13640 | /* If this member is a template, get the underlying | |
13641 | FUNCTION_DECL. */ | |
13642 | if (DECL_FUNCTION_TEMPLATE_P (member_function)) | |
13643 | member_function = DECL_TEMPLATE_RESULT (member_function); | |
13644 | ||
13645 | /* There should not be any class definitions in progress at this | |
13646 | point; the bodies of members are only parsed outside of all class | |
13647 | definitions. */ | |
13648 | my_friendly_assert (parser->num_classes_being_defined == 0, 20010816); | |
13649 | /* While we're parsing the member functions we might encounter more | |
13650 | classes. We want to handle them right away, but we don't want | |
13651 | them getting mixed up with functions that are currently in the | |
13652 | queue. */ | |
13653 | parser->unparsed_functions_queues | |
13654 | = tree_cons (NULL_TREE, NULL_TREE, parser->unparsed_functions_queues); | |
13655 | ||
13656 | /* Make sure that any template parameters are in scope. */ | |
13657 | maybe_begin_member_template_processing (member_function); | |
13658 | ||
a723baf1 MM |
13659 | /* If the body of the function has not yet been parsed, parse it |
13660 | now. */ | |
13661 | if (DECL_PENDING_INLINE_P (member_function)) | |
13662 | { | |
13663 | tree function_scope; | |
13664 | cp_token_cache *tokens; | |
13665 | ||
13666 | /* The function is no longer pending; we are processing it. */ | |
13667 | tokens = DECL_PENDING_INLINE_INFO (member_function); | |
13668 | DECL_PENDING_INLINE_INFO (member_function) = NULL; | |
13669 | DECL_PENDING_INLINE_P (member_function) = 0; | |
13670 | /* If this was an inline function in a local class, enter the scope | |
13671 | of the containing function. */ | |
13672 | function_scope = decl_function_context (member_function); | |
13673 | if (function_scope) | |
13674 | push_function_context_to (function_scope); | |
13675 | ||
13676 | /* Save away the current lexer. */ | |
13677 | saved_lexer = parser->lexer; | |
13678 | /* Make a new lexer to feed us the tokens saved for this function. */ | |
13679 | parser->lexer = cp_lexer_new_from_tokens (tokens); | |
13680 | parser->lexer->next = saved_lexer; | |
13681 | ||
13682 | /* Set the current source position to be the location of the first | |
13683 | token in the saved inline body. */ | |
3466b292 | 13684 | cp_lexer_peek_token (parser->lexer); |
a723baf1 MM |
13685 | |
13686 | /* Let the front end know that we going to be defining this | |
13687 | function. */ | |
13688 | start_function (NULL_TREE, member_function, NULL_TREE, | |
13689 | SF_PRE_PARSED | SF_INCLASS_INLINE); | |
13690 | ||
13691 | /* Now, parse the body of the function. */ | |
13692 | cp_parser_function_definition_after_declarator (parser, | |
13693 | /*inline_p=*/true); | |
13694 | ||
13695 | /* Leave the scope of the containing function. */ | |
13696 | if (function_scope) | |
13697 | pop_function_context_from (function_scope); | |
13698 | /* Restore the lexer. */ | |
13699 | parser->lexer = saved_lexer; | |
13700 | } | |
13701 | ||
13702 | /* Remove any template parameters from the symbol table. */ | |
13703 | maybe_end_member_template_processing (); | |
13704 | ||
13705 | /* Restore the queue. */ | |
13706 | parser->unparsed_functions_queues | |
13707 | = TREE_CHAIN (parser->unparsed_functions_queues); | |
13708 | } | |
13709 | ||
8db1028e NS |
13710 | /* If DECL contains any default args, remeber it on the unparsed |
13711 | functions queue. */ | |
13712 | ||
13713 | static void | |
13714 | cp_parser_save_default_args (cp_parser* parser, tree decl) | |
13715 | { | |
13716 | tree probe; | |
13717 | ||
13718 | for (probe = TYPE_ARG_TYPES (TREE_TYPE (decl)); | |
13719 | probe; | |
13720 | probe = TREE_CHAIN (probe)) | |
13721 | if (TREE_PURPOSE (probe)) | |
13722 | { | |
13723 | TREE_PURPOSE (parser->unparsed_functions_queues) | |
13724 | = tree_cons (NULL_TREE, decl, | |
13725 | TREE_PURPOSE (parser->unparsed_functions_queues)); | |
13726 | break; | |
13727 | } | |
13728 | return; | |
13729 | } | |
13730 | ||
8218bd34 MM |
13731 | /* FN is a FUNCTION_DECL which may contains a parameter with an |
13732 | unparsed DEFAULT_ARG. Parse the default args now. */ | |
a723baf1 MM |
13733 | |
13734 | static void | |
8218bd34 | 13735 | cp_parser_late_parsing_default_args (cp_parser *parser, tree fn) |
a723baf1 MM |
13736 | { |
13737 | cp_lexer *saved_lexer; | |
13738 | cp_token_cache *tokens; | |
13739 | bool saved_local_variables_forbidden_p; | |
13740 | tree parameters; | |
8218bd34 MM |
13741 | |
13742 | for (parameters = TYPE_ARG_TYPES (TREE_TYPE (fn)); | |
a723baf1 MM |
13743 | parameters; |
13744 | parameters = TREE_CHAIN (parameters)) | |
13745 | { | |
13746 | if (!TREE_PURPOSE (parameters) | |
13747 | || TREE_CODE (TREE_PURPOSE (parameters)) != DEFAULT_ARG) | |
13748 | continue; | |
13749 | ||
13750 | /* Save away the current lexer. */ | |
13751 | saved_lexer = parser->lexer; | |
13752 | /* Create a new one, using the tokens we have saved. */ | |
13753 | tokens = DEFARG_TOKENS (TREE_PURPOSE (parameters)); | |
13754 | parser->lexer = cp_lexer_new_from_tokens (tokens); | |
13755 | ||
13756 | /* Set the current source position to be the location of the | |
13757 | first token in the default argument. */ | |
3466b292 | 13758 | cp_lexer_peek_token (parser->lexer); |
a723baf1 MM |
13759 | |
13760 | /* Local variable names (and the `this' keyword) may not appear | |
13761 | in a default argument. */ | |
13762 | saved_local_variables_forbidden_p = parser->local_variables_forbidden_p; | |
13763 | parser->local_variables_forbidden_p = true; | |
13764 | /* Parse the assignment-expression. */ | |
8218bd34 | 13765 | if (DECL_CONTEXT (fn)) |
14d22dd6 | 13766 | push_nested_class (DECL_CONTEXT (fn)); |
a723baf1 | 13767 | TREE_PURPOSE (parameters) = cp_parser_assignment_expression (parser); |
8218bd34 | 13768 | if (DECL_CONTEXT (fn)) |
e5976695 | 13769 | pop_nested_class (); |
a723baf1 MM |
13770 | |
13771 | /* Restore saved state. */ | |
13772 | parser->lexer = saved_lexer; | |
13773 | parser->local_variables_forbidden_p = saved_local_variables_forbidden_p; | |
13774 | } | |
13775 | } | |
13776 | ||
13777 | /* Parse the operand of `sizeof' (or a similar operator). Returns | |
13778 | either a TYPE or an expression, depending on the form of the | |
13779 | input. The KEYWORD indicates which kind of expression we have | |
13780 | encountered. */ | |
13781 | ||
13782 | static tree | |
94edc4ab | 13783 | cp_parser_sizeof_operand (cp_parser* parser, enum rid keyword) |
a723baf1 MM |
13784 | { |
13785 | static const char *format; | |
13786 | tree expr = NULL_TREE; | |
13787 | const char *saved_message; | |
13788 | bool saved_constant_expression_p; | |
13789 | ||
13790 | /* Initialize FORMAT the first time we get here. */ | |
13791 | if (!format) | |
13792 | format = "types may not be defined in `%s' expressions"; | |
13793 | ||
13794 | /* Types cannot be defined in a `sizeof' expression. Save away the | |
13795 | old message. */ | |
13796 | saved_message = parser->type_definition_forbidden_message; | |
13797 | /* And create the new one. */ | |
13798 | parser->type_definition_forbidden_message | |
13799 | = ((const char *) | |
13800 | xmalloc (strlen (format) | |
13801 | + strlen (IDENTIFIER_POINTER (ridpointers[keyword])) | |
13802 | + 1 /* `\0' */)); | |
13803 | sprintf ((char *) parser->type_definition_forbidden_message, | |
13804 | format, IDENTIFIER_POINTER (ridpointers[keyword])); | |
13805 | ||
13806 | /* The restrictions on constant-expressions do not apply inside | |
13807 | sizeof expressions. */ | |
13808 | saved_constant_expression_p = parser->constant_expression_p; | |
13809 | parser->constant_expression_p = false; | |
13810 | ||
3beb3abf MM |
13811 | /* Do not actually evaluate the expression. */ |
13812 | ++skip_evaluation; | |
a723baf1 MM |
13813 | /* If it's a `(', then we might be looking at the type-id |
13814 | construction. */ | |
13815 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
13816 | { | |
13817 | tree type; | |
13818 | ||
13819 | /* We can't be sure yet whether we're looking at a type-id or an | |
13820 | expression. */ | |
13821 | cp_parser_parse_tentatively (parser); | |
13822 | /* Consume the `('. */ | |
13823 | cp_lexer_consume_token (parser->lexer); | |
13824 | /* Parse the type-id. */ | |
13825 | type = cp_parser_type_id (parser); | |
13826 | /* Now, look for the trailing `)'. */ | |
13827 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
13828 | /* If all went well, then we're done. */ | |
13829 | if (cp_parser_parse_definitely (parser)) | |
13830 | { | |
13831 | /* Build a list of decl-specifiers; right now, we have only | |
13832 | a single type-specifier. */ | |
13833 | type = build_tree_list (NULL_TREE, | |
13834 | type); | |
13835 | ||
13836 | /* Call grokdeclarator to figure out what type this is. */ | |
13837 | expr = grokdeclarator (NULL_TREE, | |
13838 | type, | |
13839 | TYPENAME, | |
13840 | /*initialized=*/0, | |
13841 | /*attrlist=*/NULL); | |
13842 | } | |
13843 | } | |
13844 | ||
13845 | /* If the type-id production did not work out, then we must be | |
13846 | looking at the unary-expression production. */ | |
13847 | if (!expr) | |
13848 | expr = cp_parser_unary_expression (parser, /*address_p=*/false); | |
3beb3abf MM |
13849 | /* Go back to evaluating expressions. */ |
13850 | --skip_evaluation; | |
a723baf1 MM |
13851 | |
13852 | /* Free the message we created. */ | |
13853 | free ((char *) parser->type_definition_forbidden_message); | |
13854 | /* And restore the old one. */ | |
13855 | parser->type_definition_forbidden_message = saved_message; | |
13856 | parser->constant_expression_p = saved_constant_expression_p; | |
13857 | ||
13858 | return expr; | |
13859 | } | |
13860 | ||
13861 | /* If the current declaration has no declarator, return true. */ | |
13862 | ||
13863 | static bool | |
13864 | cp_parser_declares_only_class_p (cp_parser *parser) | |
13865 | { | |
13866 | /* If the next token is a `;' or a `,' then there is no | |
13867 | declarator. */ | |
13868 | return (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON) | |
13869 | || cp_lexer_next_token_is (parser->lexer, CPP_COMMA)); | |
13870 | } | |
13871 | ||
d17811fd MM |
13872 | /* Simplify EXPR if it is a non-dependent expression. Returns the |
13873 | (possibly simplified) expression. */ | |
13874 | ||
13875 | static tree | |
13876 | cp_parser_fold_non_dependent_expr (tree expr) | |
13877 | { | |
13878 | /* If we're in a template, but EXPR isn't value dependent, simplify | |
13879 | it. We're supposed to treat: | |
13880 | ||
13881 | template <typename T> void f(T[1 + 1]); | |
13882 | template <typename T> void f(T[2]); | |
13883 | ||
13884 | as two declarations of the same function, for example. */ | |
13885 | if (processing_template_decl | |
13886 | && !type_dependent_expression_p (expr) | |
13887 | && !value_dependent_expression_p (expr)) | |
13888 | { | |
13889 | HOST_WIDE_INT saved_processing_template_decl; | |
13890 | ||
13891 | saved_processing_template_decl = processing_template_decl; | |
13892 | processing_template_decl = 0; | |
13893 | expr = tsubst_copy_and_build (expr, | |
13894 | /*args=*/NULL_TREE, | |
13895 | tf_error, | |
b3445994 MM |
13896 | /*in_decl=*/NULL_TREE, |
13897 | /*function_p=*/false); | |
d17811fd MM |
13898 | processing_template_decl = saved_processing_template_decl; |
13899 | } | |
13900 | return expr; | |
13901 | } | |
13902 | ||
a723baf1 MM |
13903 | /* DECL_SPECIFIERS is the representation of a decl-specifier-seq. |
13904 | Returns TRUE iff `friend' appears among the DECL_SPECIFIERS. */ | |
13905 | ||
13906 | static bool | |
94edc4ab | 13907 | cp_parser_friend_p (tree decl_specifiers) |
a723baf1 MM |
13908 | { |
13909 | while (decl_specifiers) | |
13910 | { | |
13911 | /* See if this decl-specifier is `friend'. */ | |
13912 | if (TREE_CODE (TREE_VALUE (decl_specifiers)) == IDENTIFIER_NODE | |
13913 | && C_RID_CODE (TREE_VALUE (decl_specifiers)) == RID_FRIEND) | |
13914 | return true; | |
13915 | ||
13916 | /* Go on to the next decl-specifier. */ | |
13917 | decl_specifiers = TREE_CHAIN (decl_specifiers); | |
13918 | } | |
13919 | ||
13920 | return false; | |
13921 | } | |
13922 | ||
13923 | /* If the next token is of the indicated TYPE, consume it. Otherwise, | |
13924 | issue an error message indicating that TOKEN_DESC was expected. | |
13925 | ||
13926 | Returns the token consumed, if the token had the appropriate type. | |
13927 | Otherwise, returns NULL. */ | |
13928 | ||
13929 | static cp_token * | |
94edc4ab NN |
13930 | cp_parser_require (cp_parser* parser, |
13931 | enum cpp_ttype type, | |
13932 | const char* token_desc) | |
a723baf1 MM |
13933 | { |
13934 | if (cp_lexer_next_token_is (parser->lexer, type)) | |
13935 | return cp_lexer_consume_token (parser->lexer); | |
13936 | else | |
13937 | { | |
e5976695 MM |
13938 | /* Output the MESSAGE -- unless we're parsing tentatively. */ |
13939 | if (!cp_parser_simulate_error (parser)) | |
13940 | error ("expected %s", token_desc); | |
a723baf1 MM |
13941 | return NULL; |
13942 | } | |
13943 | } | |
13944 | ||
13945 | /* Like cp_parser_require, except that tokens will be skipped until | |
13946 | the desired token is found. An error message is still produced if | |
13947 | the next token is not as expected. */ | |
13948 | ||
13949 | static void | |
94edc4ab NN |
13950 | cp_parser_skip_until_found (cp_parser* parser, |
13951 | enum cpp_ttype type, | |
13952 | const char* token_desc) | |
a723baf1 MM |
13953 | { |
13954 | cp_token *token; | |
13955 | unsigned nesting_depth = 0; | |
13956 | ||
13957 | if (cp_parser_require (parser, type, token_desc)) | |
13958 | return; | |
13959 | ||
13960 | /* Skip tokens until the desired token is found. */ | |
13961 | while (true) | |
13962 | { | |
13963 | /* Peek at the next token. */ | |
13964 | token = cp_lexer_peek_token (parser->lexer); | |
13965 | /* If we've reached the token we want, consume it and | |
13966 | stop. */ | |
13967 | if (token->type == type && !nesting_depth) | |
13968 | { | |
13969 | cp_lexer_consume_token (parser->lexer); | |
13970 | return; | |
13971 | } | |
13972 | /* If we've run out of tokens, stop. */ | |
13973 | if (token->type == CPP_EOF) | |
13974 | return; | |
13975 | if (token->type == CPP_OPEN_BRACE | |
13976 | || token->type == CPP_OPEN_PAREN | |
13977 | || token->type == CPP_OPEN_SQUARE) | |
13978 | ++nesting_depth; | |
13979 | else if (token->type == CPP_CLOSE_BRACE | |
13980 | || token->type == CPP_CLOSE_PAREN | |
13981 | || token->type == CPP_CLOSE_SQUARE) | |
13982 | { | |
13983 | if (nesting_depth-- == 0) | |
13984 | return; | |
13985 | } | |
13986 | /* Consume this token. */ | |
13987 | cp_lexer_consume_token (parser->lexer); | |
13988 | } | |
13989 | } | |
13990 | ||
13991 | /* If the next token is the indicated keyword, consume it. Otherwise, | |
13992 | issue an error message indicating that TOKEN_DESC was expected. | |
13993 | ||
13994 | Returns the token consumed, if the token had the appropriate type. | |
13995 | Otherwise, returns NULL. */ | |
13996 | ||
13997 | static cp_token * | |
94edc4ab NN |
13998 | cp_parser_require_keyword (cp_parser* parser, |
13999 | enum rid keyword, | |
14000 | const char* token_desc) | |
a723baf1 MM |
14001 | { |
14002 | cp_token *token = cp_parser_require (parser, CPP_KEYWORD, token_desc); | |
14003 | ||
14004 | if (token && token->keyword != keyword) | |
14005 | { | |
14006 | dyn_string_t error_msg; | |
14007 | ||
14008 | /* Format the error message. */ | |
14009 | error_msg = dyn_string_new (0); | |
14010 | dyn_string_append_cstr (error_msg, "expected "); | |
14011 | dyn_string_append_cstr (error_msg, token_desc); | |
14012 | cp_parser_error (parser, error_msg->s); | |
14013 | dyn_string_delete (error_msg); | |
14014 | return NULL; | |
14015 | } | |
14016 | ||
14017 | return token; | |
14018 | } | |
14019 | ||
14020 | /* Returns TRUE iff TOKEN is a token that can begin the body of a | |
14021 | function-definition. */ | |
14022 | ||
14023 | static bool | |
94edc4ab | 14024 | cp_parser_token_starts_function_definition_p (cp_token* token) |
a723baf1 MM |
14025 | { |
14026 | return (/* An ordinary function-body begins with an `{'. */ | |
14027 | token->type == CPP_OPEN_BRACE | |
14028 | /* A ctor-initializer begins with a `:'. */ | |
14029 | || token->type == CPP_COLON | |
14030 | /* A function-try-block begins with `try'. */ | |
14031 | || token->keyword == RID_TRY | |
14032 | /* The named return value extension begins with `return'. */ | |
14033 | || token->keyword == RID_RETURN); | |
14034 | } | |
14035 | ||
14036 | /* Returns TRUE iff the next token is the ":" or "{" beginning a class | |
14037 | definition. */ | |
14038 | ||
14039 | static bool | |
14040 | cp_parser_next_token_starts_class_definition_p (cp_parser *parser) | |
14041 | { | |
14042 | cp_token *token; | |
14043 | ||
14044 | token = cp_lexer_peek_token (parser->lexer); | |
14045 | return (token->type == CPP_OPEN_BRACE || token->type == CPP_COLON); | |
14046 | } | |
14047 | ||
d17811fd MM |
14048 | /* Returns TRUE iff the next token is the "," or ">" ending a |
14049 | template-argument. */ | |
14050 | ||
14051 | static bool | |
14052 | cp_parser_next_token_ends_template_argument_p (cp_parser *parser) | |
14053 | { | |
14054 | cp_token *token; | |
14055 | ||
14056 | token = cp_lexer_peek_token (parser->lexer); | |
14057 | return (token->type == CPP_COMMA || token->type == CPP_GREATER); | |
14058 | } | |
14059 | ||
a723baf1 MM |
14060 | /* Returns the kind of tag indicated by TOKEN, if it is a class-key, |
14061 | or none_type otherwise. */ | |
14062 | ||
14063 | static enum tag_types | |
94edc4ab | 14064 | cp_parser_token_is_class_key (cp_token* token) |
a723baf1 MM |
14065 | { |
14066 | switch (token->keyword) | |
14067 | { | |
14068 | case RID_CLASS: | |
14069 | return class_type; | |
14070 | case RID_STRUCT: | |
14071 | return record_type; | |
14072 | case RID_UNION: | |
14073 | return union_type; | |
14074 | ||
14075 | default: | |
14076 | return none_type; | |
14077 | } | |
14078 | } | |
14079 | ||
14080 | /* Issue an error message if the CLASS_KEY does not match the TYPE. */ | |
14081 | ||
14082 | static void | |
14083 | cp_parser_check_class_key (enum tag_types class_key, tree type) | |
14084 | { | |
14085 | if ((TREE_CODE (type) == UNION_TYPE) != (class_key == union_type)) | |
14086 | pedwarn ("`%s' tag used in naming `%#T'", | |
14087 | class_key == union_type ? "union" | |
14088 | : class_key == record_type ? "struct" : "class", | |
14089 | type); | |
14090 | } | |
14091 | ||
14092 | /* Look for the `template' keyword, as a syntactic disambiguator. | |
14093 | Return TRUE iff it is present, in which case it will be | |
14094 | consumed. */ | |
14095 | ||
14096 | static bool | |
14097 | cp_parser_optional_template_keyword (cp_parser *parser) | |
14098 | { | |
14099 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
14100 | { | |
14101 | /* The `template' keyword can only be used within templates; | |
14102 | outside templates the parser can always figure out what is a | |
14103 | template and what is not. */ | |
14104 | if (!processing_template_decl) | |
14105 | { | |
14106 | error ("`template' (as a disambiguator) is only allowed " | |
14107 | "within templates"); | |
14108 | /* If this part of the token stream is rescanned, the same | |
14109 | error message would be generated. So, we purge the token | |
14110 | from the stream. */ | |
14111 | cp_lexer_purge_token (parser->lexer); | |
14112 | return false; | |
14113 | } | |
14114 | else | |
14115 | { | |
14116 | /* Consume the `template' keyword. */ | |
14117 | cp_lexer_consume_token (parser->lexer); | |
14118 | return true; | |
14119 | } | |
14120 | } | |
14121 | ||
14122 | return false; | |
14123 | } | |
14124 | ||
2050a1bb MM |
14125 | /* The next token is a CPP_NESTED_NAME_SPECIFIER. Consume the token, |
14126 | set PARSER->SCOPE, and perform other related actions. */ | |
14127 | ||
14128 | static void | |
14129 | cp_parser_pre_parsed_nested_name_specifier (cp_parser *parser) | |
14130 | { | |
14131 | tree value; | |
14132 | tree check; | |
14133 | ||
14134 | /* Get the stored value. */ | |
14135 | value = cp_lexer_consume_token (parser->lexer)->value; | |
14136 | /* Perform any access checks that were deferred. */ | |
14137 | for (check = TREE_PURPOSE (value); check; check = TREE_CHAIN (check)) | |
cf22909c | 14138 | perform_or_defer_access_check (TREE_PURPOSE (check), TREE_VALUE (check)); |
2050a1bb MM |
14139 | /* Set the scope from the stored value. */ |
14140 | parser->scope = TREE_VALUE (value); | |
14141 | parser->qualifying_scope = TREE_TYPE (value); | |
14142 | parser->object_scope = NULL_TREE; | |
14143 | } | |
14144 | ||
a723baf1 MM |
14145 | /* Add tokens to CACHE until an non-nested END token appears. */ |
14146 | ||
14147 | static void | |
14148 | cp_parser_cache_group (cp_parser *parser, | |
14149 | cp_token_cache *cache, | |
14150 | enum cpp_ttype end, | |
14151 | unsigned depth) | |
14152 | { | |
14153 | while (true) | |
14154 | { | |
14155 | cp_token *token; | |
14156 | ||
14157 | /* Abort a parenthesized expression if we encounter a brace. */ | |
14158 | if ((end == CPP_CLOSE_PAREN || depth == 0) | |
14159 | && cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
14160 | return; | |
14161 | /* Consume the next token. */ | |
14162 | token = cp_lexer_consume_token (parser->lexer); | |
14163 | /* If we've reached the end of the file, stop. */ | |
14164 | if (token->type == CPP_EOF) | |
14165 | return; | |
14166 | /* Add this token to the tokens we are saving. */ | |
14167 | cp_token_cache_push_token (cache, token); | |
14168 | /* See if it starts a new group. */ | |
14169 | if (token->type == CPP_OPEN_BRACE) | |
14170 | { | |
14171 | cp_parser_cache_group (parser, cache, CPP_CLOSE_BRACE, depth + 1); | |
14172 | if (depth == 0) | |
14173 | return; | |
14174 | } | |
14175 | else if (token->type == CPP_OPEN_PAREN) | |
14176 | cp_parser_cache_group (parser, cache, CPP_CLOSE_PAREN, depth + 1); | |
14177 | else if (token->type == end) | |
14178 | return; | |
14179 | } | |
14180 | } | |
14181 | ||
14182 | /* Begin parsing tentatively. We always save tokens while parsing | |
14183 | tentatively so that if the tentative parsing fails we can restore the | |
14184 | tokens. */ | |
14185 | ||
14186 | static void | |
94edc4ab | 14187 | cp_parser_parse_tentatively (cp_parser* parser) |
a723baf1 MM |
14188 | { |
14189 | /* Enter a new parsing context. */ | |
14190 | parser->context = cp_parser_context_new (parser->context); | |
14191 | /* Begin saving tokens. */ | |
14192 | cp_lexer_save_tokens (parser->lexer); | |
14193 | /* In order to avoid repetitive access control error messages, | |
14194 | access checks are queued up until we are no longer parsing | |
14195 | tentatively. */ | |
8d241e0b | 14196 | push_deferring_access_checks (dk_deferred); |
a723baf1 MM |
14197 | } |
14198 | ||
14199 | /* Commit to the currently active tentative parse. */ | |
14200 | ||
14201 | static void | |
94edc4ab | 14202 | cp_parser_commit_to_tentative_parse (cp_parser* parser) |
a723baf1 MM |
14203 | { |
14204 | cp_parser_context *context; | |
14205 | cp_lexer *lexer; | |
14206 | ||
14207 | /* Mark all of the levels as committed. */ | |
14208 | lexer = parser->lexer; | |
14209 | for (context = parser->context; context->next; context = context->next) | |
14210 | { | |
14211 | if (context->status == CP_PARSER_STATUS_KIND_COMMITTED) | |
14212 | break; | |
14213 | context->status = CP_PARSER_STATUS_KIND_COMMITTED; | |
14214 | while (!cp_lexer_saving_tokens (lexer)) | |
14215 | lexer = lexer->next; | |
14216 | cp_lexer_commit_tokens (lexer); | |
14217 | } | |
14218 | } | |
14219 | ||
14220 | /* Abort the currently active tentative parse. All consumed tokens | |
14221 | will be rolled back, and no diagnostics will be issued. */ | |
14222 | ||
14223 | static void | |
94edc4ab | 14224 | cp_parser_abort_tentative_parse (cp_parser* parser) |
a723baf1 MM |
14225 | { |
14226 | cp_parser_simulate_error (parser); | |
14227 | /* Now, pretend that we want to see if the construct was | |
14228 | successfully parsed. */ | |
14229 | cp_parser_parse_definitely (parser); | |
14230 | } | |
14231 | ||
34cd5ae7 | 14232 | /* Stop parsing tentatively. If a parse error has occurred, restore the |
a723baf1 MM |
14233 | token stream. Otherwise, commit to the tokens we have consumed. |
14234 | Returns true if no error occurred; false otherwise. */ | |
14235 | ||
14236 | static bool | |
94edc4ab | 14237 | cp_parser_parse_definitely (cp_parser* parser) |
a723baf1 MM |
14238 | { |
14239 | bool error_occurred; | |
14240 | cp_parser_context *context; | |
14241 | ||
34cd5ae7 | 14242 | /* Remember whether or not an error occurred, since we are about to |
a723baf1 MM |
14243 | destroy that information. */ |
14244 | error_occurred = cp_parser_error_occurred (parser); | |
14245 | /* Remove the topmost context from the stack. */ | |
14246 | context = parser->context; | |
14247 | parser->context = context->next; | |
14248 | /* If no parse errors occurred, commit to the tentative parse. */ | |
14249 | if (!error_occurred) | |
14250 | { | |
14251 | /* Commit to the tokens read tentatively, unless that was | |
14252 | already done. */ | |
14253 | if (context->status != CP_PARSER_STATUS_KIND_COMMITTED) | |
14254 | cp_lexer_commit_tokens (parser->lexer); | |
cf22909c KL |
14255 | |
14256 | pop_to_parent_deferring_access_checks (); | |
a723baf1 MM |
14257 | } |
14258 | /* Otherwise, if errors occurred, roll back our state so that things | |
14259 | are just as they were before we began the tentative parse. */ | |
14260 | else | |
cf22909c KL |
14261 | { |
14262 | cp_lexer_rollback_tokens (parser->lexer); | |
14263 | pop_deferring_access_checks (); | |
14264 | } | |
e5976695 MM |
14265 | /* Add the context to the front of the free list. */ |
14266 | context->next = cp_parser_context_free_list; | |
14267 | cp_parser_context_free_list = context; | |
14268 | ||
14269 | return !error_occurred; | |
a723baf1 MM |
14270 | } |
14271 | ||
a723baf1 MM |
14272 | /* Returns true if we are parsing tentatively -- but have decided that |
14273 | we will stick with this tentative parse, even if errors occur. */ | |
14274 | ||
14275 | static bool | |
94edc4ab | 14276 | cp_parser_committed_to_tentative_parse (cp_parser* parser) |
a723baf1 MM |
14277 | { |
14278 | return (cp_parser_parsing_tentatively (parser) | |
14279 | && parser->context->status == CP_PARSER_STATUS_KIND_COMMITTED); | |
14280 | } | |
14281 | ||
4de8668e | 14282 | /* Returns nonzero iff an error has occurred during the most recent |
a723baf1 MM |
14283 | tentative parse. */ |
14284 | ||
14285 | static bool | |
94edc4ab | 14286 | cp_parser_error_occurred (cp_parser* parser) |
a723baf1 MM |
14287 | { |
14288 | return (cp_parser_parsing_tentatively (parser) | |
14289 | && parser->context->status == CP_PARSER_STATUS_KIND_ERROR); | |
14290 | } | |
14291 | ||
4de8668e | 14292 | /* Returns nonzero if GNU extensions are allowed. */ |
a723baf1 MM |
14293 | |
14294 | static bool | |
94edc4ab | 14295 | cp_parser_allow_gnu_extensions_p (cp_parser* parser) |
a723baf1 MM |
14296 | { |
14297 | return parser->allow_gnu_extensions_p; | |
14298 | } | |
14299 | ||
14300 | \f | |
14301 | ||
14302 | /* The parser. */ | |
14303 | ||
14304 | static GTY (()) cp_parser *the_parser; | |
14305 | ||
14306 | /* External interface. */ | |
14307 | ||
d1bd0ded | 14308 | /* Parse one entire translation unit. */ |
a723baf1 | 14309 | |
d1bd0ded GK |
14310 | void |
14311 | c_parse_file (void) | |
a723baf1 MM |
14312 | { |
14313 | bool error_occurred; | |
14314 | ||
14315 | the_parser = cp_parser_new (); | |
78757caa KL |
14316 | push_deferring_access_checks (flag_access_control |
14317 | ? dk_no_deferred : dk_no_check); | |
a723baf1 MM |
14318 | error_occurred = cp_parser_translation_unit (the_parser); |
14319 | the_parser = NULL; | |
a723baf1 MM |
14320 | } |
14321 | ||
14322 | /* Clean up after parsing the entire translation unit. */ | |
14323 | ||
14324 | void | |
94edc4ab | 14325 | free_parser_stacks (void) |
a723baf1 MM |
14326 | { |
14327 | /* Nothing to do. */ | |
14328 | } | |
14329 | ||
14330 | /* This variable must be provided by every front end. */ | |
14331 | ||
14332 | int yydebug; | |
14333 | ||
14334 | #include "gt-cp-parser.h" |