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1 | /* C++ Parser. |
2 | Copyright (C) 2000, 2001, 2002 Free Software Foundation, Inc. | |
3 | Written by Mark Mitchell <mark@codesourcery.com>. | |
4 | ||
5 | This file is part of GNU CC. | |
6 | ||
7 | GNU CC is free software; you can redistribute it and/or modify it | |
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 | ||
12 | GNU CC is distributed in the hope that it will be useful, but | |
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 | |
18 | along with GNU CC; see the file COPYING. If not, write to the Free | |
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" | |
35 | #include "ggc.h" | |
36 | #include "toplev.h" | |
37 | #include "output.h" | |
38 | ||
39 | \f | |
40 | /* The lexer. */ | |
41 | ||
42 | /* Overview | |
43 | -------- | |
44 | ||
45 | A cp_lexer represents a stream of cp_tokens. It allows arbitrary | |
46 | look-ahead. | |
47 | ||
48 | Methodology | |
49 | ----------- | |
50 | ||
51 | We use a circular buffer to store incoming tokens. | |
52 | ||
53 | Some artifacts of the C++ language (such as the | |
54 | expression/declaration ambiguity) require arbitrary look-ahead. | |
55 | The strategy we adopt for dealing with these problems is to attempt | |
56 | to parse one construct (e.g., the declaration) and fall back to the | |
57 | other (e.g., the expression) if that attempt does not succeed. | |
58 | Therefore, we must sometimes store an arbitrary number of tokens. | |
59 | ||
60 | The parser routinely peeks at the next token, and then consumes it | |
61 | later. That also requires a buffer in which to store the tokens. | |
62 | ||
63 | In order to easily permit adding tokens to the end of the buffer, | |
64 | while removing them from the beginning of the buffer, we use a | |
65 | circular buffer. */ | |
66 | ||
67 | /* A C++ token. */ | |
68 | ||
69 | typedef struct cp_token GTY (()) | |
70 | { | |
71 | /* The kind of token. */ | |
72 | enum cpp_ttype type; | |
73 | /* The value associated with this token, if any. */ | |
74 | tree value; | |
75 | /* If this token is a keyword, this value indicates which keyword. | |
76 | Otherwise, this value is RID_MAX. */ | |
77 | enum rid keyword; | |
78 | /* The file in which this token was found. */ | |
79 | const char *file_name; | |
80 | /* The line at which this token was found. */ | |
81 | int line_number; | |
82 | } cp_token; | |
83 | ||
84 | /* The number of tokens in a single token block. */ | |
85 | ||
86 | #define CP_TOKEN_BLOCK_NUM_TOKENS 32 | |
87 | ||
88 | /* A group of tokens. These groups are chained together to store | |
89 | large numbers of tokens. (For example, a token block is created | |
90 | when the body of an inline member function is first encountered; | |
91 | the tokens are processed later after the class definition is | |
92 | complete.) | |
93 | ||
94 | This somewhat ungainly data structure (as opposed to, say, a | |
95 | variable-length array), is used due to contraints imposed by the | |
96 | current garbage-collection methodology. If it is made more | |
97 | flexible, we could perhaps simplify the data structures involved. */ | |
98 | ||
99 | typedef struct cp_token_block GTY (()) | |
100 | { | |
101 | /* The tokens. */ | |
102 | cp_token tokens[CP_TOKEN_BLOCK_NUM_TOKENS]; | |
103 | /* The number of tokens in this block. */ | |
104 | size_t num_tokens; | |
105 | /* The next token block in the chain. */ | |
106 | struct cp_token_block *next; | |
107 | /* The previous block in the chain. */ | |
108 | struct cp_token_block *prev; | |
109 | } cp_token_block; | |
110 | ||
111 | typedef struct cp_token_cache GTY (()) | |
112 | { | |
113 | /* The first block in the cache. NULL if there are no tokens in the | |
114 | cache. */ | |
115 | cp_token_block *first; | |
116 | /* The last block in the cache. NULL If there are no tokens in the | |
117 | cache. */ | |
118 | cp_token_block *last; | |
119 | } cp_token_cache; | |
120 | ||
121 | /* Prototypes. */ | |
122 | ||
123 | static cp_token_cache *cp_token_cache_new | |
124 | (void); | |
125 | static void cp_token_cache_push_token | |
126 | (cp_token_cache *, cp_token *); | |
127 | ||
128 | /* Create a new cp_token_cache. */ | |
129 | ||
130 | static cp_token_cache * | |
131 | cp_token_cache_new () | |
132 | { | |
133 | return (cp_token_cache *) ggc_alloc_cleared (sizeof (cp_token_cache)); | |
134 | } | |
135 | ||
136 | /* Add *TOKEN to *CACHE. */ | |
137 | ||
138 | static void | |
139 | cp_token_cache_push_token (cp_token_cache *cache, | |
140 | cp_token *token) | |
141 | { | |
142 | cp_token_block *b = cache->last; | |
143 | ||
144 | /* See if we need to allocate a new token block. */ | |
145 | if (!b || b->num_tokens == CP_TOKEN_BLOCK_NUM_TOKENS) | |
146 | { | |
147 | b = ((cp_token_block *) ggc_alloc_cleared (sizeof (cp_token_block))); | |
148 | b->prev = cache->last; | |
149 | if (cache->last) | |
150 | { | |
151 | cache->last->next = b; | |
152 | cache->last = b; | |
153 | } | |
154 | else | |
155 | cache->first = cache->last = b; | |
156 | } | |
157 | /* Add this token to the current token block. */ | |
158 | b->tokens[b->num_tokens++] = *token; | |
159 | } | |
160 | ||
161 | /* The cp_lexer structure represents the C++ lexer. It is responsible | |
162 | for managing the token stream from the preprocessor and supplying | |
163 | it to the parser. */ | |
164 | ||
165 | typedef struct cp_lexer GTY (()) | |
166 | { | |
167 | /* The memory allocated for the buffer. Never NULL. */ | |
168 | cp_token * GTY ((length ("(%h.buffer_end - %h.buffer)"))) buffer; | |
169 | /* A pointer just past the end of the memory allocated for the buffer. */ | |
170 | cp_token * GTY ((skip (""))) buffer_end; | |
171 | /* The first valid token in the buffer, or NULL if none. */ | |
172 | cp_token * GTY ((skip (""))) first_token; | |
173 | /* The next available token. If NEXT_TOKEN is NULL, then there are | |
174 | no more available tokens. */ | |
175 | cp_token * GTY ((skip (""))) next_token; | |
176 | /* A pointer just past the last available token. If FIRST_TOKEN is | |
177 | NULL, however, there are no available tokens, and then this | |
178 | location is simply the place in which the next token read will be | |
179 | placed. If LAST_TOKEN == FIRST_TOKEN, then the buffer is full. | |
180 | When the LAST_TOKEN == BUFFER, then the last token is at the | |
181 | highest memory address in the BUFFER. */ | |
182 | cp_token * GTY ((skip (""))) last_token; | |
183 | ||
184 | /* A stack indicating positions at which cp_lexer_save_tokens was | |
185 | called. The top entry is the most recent position at which we | |
186 | began saving tokens. The entries are differences in token | |
187 | position between FIRST_TOKEN and the first saved token. | |
188 | ||
189 | If the stack is non-empty, we are saving tokens. When a token is | |
190 | consumed, the NEXT_TOKEN pointer will move, but the FIRST_TOKEN | |
191 | pointer will not. The token stream will be preserved so that it | |
192 | can be reexamined later. | |
193 | ||
194 | If the stack is empty, then we are not saving tokens. Whenever a | |
195 | token is consumed, the FIRST_TOKEN pointer will be moved, and the | |
196 | consumed token will be gone forever. */ | |
197 | varray_type saved_tokens; | |
198 | ||
199 | /* The STRING_CST tokens encountered while processing the current | |
200 | string literal. */ | |
201 | varray_type string_tokens; | |
202 | ||
203 | /* True if we should obtain more tokens from the preprocessor; false | |
204 | if we are processing a saved token cache. */ | |
205 | bool main_lexer_p; | |
206 | ||
207 | /* True if we should output debugging information. */ | |
208 | bool debugging_p; | |
209 | ||
210 | /* The next lexer in a linked list of lexers. */ | |
211 | struct cp_lexer *next; | |
212 | } cp_lexer; | |
213 | ||
214 | /* Prototypes. */ | |
215 | ||
216 | static cp_lexer *cp_lexer_new | |
217 | PARAMS ((bool)); | |
218 | static cp_lexer *cp_lexer_new_from_tokens | |
219 | PARAMS ((struct cp_token_cache *)); | |
220 | static int cp_lexer_saving_tokens | |
221 | PARAMS ((const cp_lexer *)); | |
222 | static cp_token *cp_lexer_next_token | |
223 | PARAMS ((cp_lexer *, cp_token *)); | |
224 | static ptrdiff_t cp_lexer_token_difference | |
225 | PARAMS ((cp_lexer *, cp_token *, cp_token *)); | |
226 | static cp_token *cp_lexer_read_token | |
227 | PARAMS ((cp_lexer *)); | |
228 | static void cp_lexer_maybe_grow_buffer | |
229 | PARAMS ((cp_lexer *)); | |
230 | static void cp_lexer_get_preprocessor_token | |
231 | PARAMS ((cp_lexer *, cp_token *)); | |
232 | static cp_token *cp_lexer_peek_token | |
233 | PARAMS ((cp_lexer *)); | |
234 | static cp_token *cp_lexer_peek_nth_token | |
235 | PARAMS ((cp_lexer *, size_t)); | |
236 | static bool cp_lexer_next_token_is | |
237 | PARAMS ((cp_lexer *, enum cpp_ttype)); | |
238 | static bool cp_lexer_next_token_is_not | |
239 | PARAMS ((cp_lexer *, enum cpp_ttype)); | |
240 | static bool cp_lexer_next_token_is_keyword | |
241 | PARAMS ((cp_lexer *, enum rid)); | |
242 | static cp_token *cp_lexer_consume_token | |
243 | PARAMS ((cp_lexer *)); | |
244 | static void cp_lexer_purge_token | |
245 | (cp_lexer *); | |
246 | static void cp_lexer_purge_tokens_after | |
247 | (cp_lexer *, cp_token *); | |
248 | static void cp_lexer_save_tokens | |
249 | PARAMS ((cp_lexer *)); | |
250 | static void cp_lexer_commit_tokens | |
251 | PARAMS ((cp_lexer *)); | |
252 | static void cp_lexer_rollback_tokens | |
253 | PARAMS ((cp_lexer *)); | |
254 | static void cp_lexer_set_source_position_from_token | |
255 | PARAMS ((cp_lexer *, const cp_token *)); | |
256 | static void cp_lexer_print_token | |
257 | PARAMS ((FILE *, cp_token *)); | |
258 | static bool cp_lexer_debugging_p | |
259 | PARAMS ((cp_lexer *)); | |
260 | static void cp_lexer_start_debugging | |
261 | PARAMS ((cp_lexer *)) ATTRIBUTE_UNUSED; | |
262 | static void cp_lexer_stop_debugging | |
263 | PARAMS ((cp_lexer *)) ATTRIBUTE_UNUSED; | |
264 | ||
265 | /* Manifest constants. */ | |
266 | ||
267 | #define CP_TOKEN_BUFFER_SIZE 5 | |
268 | #define CP_SAVED_TOKENS_SIZE 5 | |
269 | ||
270 | /* A token type for keywords, as opposed to ordinary identifiers. */ | |
271 | #define CPP_KEYWORD ((enum cpp_ttype) (N_TTYPES + 1)) | |
272 | ||
273 | /* A token type for template-ids. If a template-id is processed while | |
274 | parsing tentatively, it is replaced with a CPP_TEMPLATE_ID token; | |
275 | the value of the CPP_TEMPLATE_ID is whatever was returned by | |
276 | cp_parser_template_id. */ | |
277 | #define CPP_TEMPLATE_ID ((enum cpp_ttype) (CPP_KEYWORD + 1)) | |
278 | ||
279 | /* A token type for nested-name-specifiers. If a | |
280 | nested-name-specifier is processed while parsing tentatively, it is | |
281 | replaced with a CPP_NESTED_NAME_SPECIFIER token; the value of the | |
282 | CPP_NESTED_NAME_SPECIFIER is whatever was returned by | |
283 | cp_parser_nested_name_specifier_opt. */ | |
284 | #define CPP_NESTED_NAME_SPECIFIER ((enum cpp_ttype) (CPP_TEMPLATE_ID + 1)) | |
285 | ||
286 | /* A token type for tokens that are not tokens at all; these are used | |
287 | to mark the end of a token block. */ | |
288 | #define CPP_NONE (CPP_NESTED_NAME_SPECIFIER + 1) | |
289 | ||
290 | /* Variables. */ | |
291 | ||
292 | /* The stream to which debugging output should be written. */ | |
293 | static FILE *cp_lexer_debug_stream; | |
294 | ||
295 | /* Create a new C++ lexer. If MAIN_LEXER_P is true the new lexer is | |
296 | the main lexer -- i.e, the lexer that gets tokens from the | |
297 | preprocessor. Otherwise, it is a lexer that uses a cache of stored | |
298 | tokens. */ | |
299 | ||
300 | static cp_lexer * | |
301 | cp_lexer_new (bool main_lexer_p) | |
302 | { | |
303 | cp_lexer *lexer; | |
304 | ||
305 | /* Allocate the memory. */ | |
306 | lexer = (cp_lexer *) ggc_alloc_cleared (sizeof (cp_lexer)); | |
307 | ||
308 | /* Create the circular buffer. */ | |
309 | lexer->buffer = ((cp_token *) | |
310 | ggc_alloc (CP_TOKEN_BUFFER_SIZE * sizeof (cp_token))); | |
311 | lexer->buffer_end = lexer->buffer + CP_TOKEN_BUFFER_SIZE; | |
312 | ||
313 | /* There are no tokens in the buffer. */ | |
314 | lexer->last_token = lexer->buffer; | |
315 | ||
316 | /* This lexer obtains more tokens by calling c_lex. */ | |
317 | lexer->main_lexer_p = main_lexer_p; | |
318 | ||
319 | /* Create the SAVED_TOKENS stack. */ | |
320 | VARRAY_INT_INIT (lexer->saved_tokens, CP_SAVED_TOKENS_SIZE, "saved_tokens"); | |
321 | ||
322 | /* Create the STRINGS array. */ | |
323 | VARRAY_TREE_INIT (lexer->string_tokens, 32, "strings"); | |
324 | ||
325 | /* Assume we are not debugging. */ | |
326 | lexer->debugging_p = false; | |
327 | ||
328 | return lexer; | |
329 | } | |
330 | ||
331 | /* Create a new lexer whose token stream is primed with the TOKENS. | |
332 | When these tokens are exhausted, no new tokens will be read. */ | |
333 | ||
334 | static cp_lexer * | |
335 | cp_lexer_new_from_tokens (cp_token_cache *tokens) | |
336 | { | |
337 | cp_lexer *lexer; | |
338 | cp_token *token; | |
339 | cp_token_block *block; | |
340 | ptrdiff_t num_tokens; | |
341 | ||
342 | /* Create the lexer. */ | |
343 | lexer = cp_lexer_new (/*main_lexer_p=*/false); | |
344 | ||
345 | /* Create a new buffer, appropriately sized. */ | |
346 | num_tokens = 0; | |
347 | for (block = tokens->first; block != NULL; block = block->next) | |
348 | num_tokens += block->num_tokens; | |
349 | lexer->buffer = ((cp_token *) | |
350 | ggc_alloc (num_tokens * sizeof (cp_token))); | |
351 | lexer->buffer_end = lexer->buffer + num_tokens; | |
352 | ||
353 | /* Install the tokens. */ | |
354 | token = lexer->buffer; | |
355 | for (block = tokens->first; block != NULL; block = block->next) | |
356 | { | |
357 | memcpy (token, block->tokens, block->num_tokens * sizeof (cp_token)); | |
358 | token += block->num_tokens; | |
359 | } | |
360 | ||
361 | /* The FIRST_TOKEN is the beginning of the buffer. */ | |
362 | lexer->first_token = lexer->buffer; | |
363 | /* The next available token is also at the beginning of the buffer. */ | |
364 | lexer->next_token = lexer->buffer; | |
365 | /* The buffer is full. */ | |
366 | lexer->last_token = lexer->first_token; | |
367 | ||
368 | return lexer; | |
369 | } | |
370 | ||
371 | /* Non-zero if we are presently saving tokens. */ | |
372 | ||
373 | static int | |
374 | cp_lexer_saving_tokens (lexer) | |
375 | const cp_lexer *lexer; | |
376 | { | |
377 | return VARRAY_ACTIVE_SIZE (lexer->saved_tokens) != 0; | |
378 | } | |
379 | ||
380 | /* TOKEN points into the circular token buffer. Return a pointer to | |
381 | the next token in the buffer. */ | |
382 | ||
383 | static cp_token * | |
384 | cp_lexer_next_token (lexer, token) | |
385 | cp_lexer *lexer; | |
386 | cp_token *token; | |
387 | { | |
388 | token++; | |
389 | if (token == lexer->buffer_end) | |
390 | token = lexer->buffer; | |
391 | return token; | |
392 | } | |
393 | ||
394 | /* Return a pointer to the token that is N tokens beyond TOKEN in the | |
395 | buffer. */ | |
396 | ||
397 | static cp_token * | |
398 | cp_lexer_advance_token (cp_lexer *lexer, cp_token *token, ptrdiff_t n) | |
399 | { | |
400 | token += n; | |
401 | if (token >= lexer->buffer_end) | |
402 | token = lexer->buffer + (token - lexer->buffer_end); | |
403 | return token; | |
404 | } | |
405 | ||
406 | /* Returns the number of times that START would have to be incremented | |
407 | to reach FINISH. If START and FINISH are the same, returns zero. */ | |
408 | ||
409 | static ptrdiff_t | |
410 | cp_lexer_token_difference (lexer, start, finish) | |
411 | cp_lexer *lexer; | |
412 | cp_token *start; | |
413 | cp_token *finish; | |
414 | { | |
415 | if (finish >= start) | |
416 | return finish - start; | |
417 | else | |
418 | return ((lexer->buffer_end - lexer->buffer) | |
419 | - (start - finish)); | |
420 | } | |
421 | ||
422 | /* Obtain another token from the C preprocessor and add it to the | |
423 | token buffer. Returns the newly read token. */ | |
424 | ||
425 | static cp_token * | |
426 | cp_lexer_read_token (lexer) | |
427 | cp_lexer *lexer; | |
428 | { | |
429 | cp_token *token; | |
430 | ||
431 | /* Make sure there is room in the buffer. */ | |
432 | cp_lexer_maybe_grow_buffer (lexer); | |
433 | ||
434 | /* If there weren't any tokens, then this one will be the first. */ | |
435 | if (!lexer->first_token) | |
436 | lexer->first_token = lexer->last_token; | |
437 | /* Similarly, if there were no available tokens, there is one now. */ | |
438 | if (!lexer->next_token) | |
439 | lexer->next_token = lexer->last_token; | |
440 | ||
441 | /* Figure out where we're going to store the new token. */ | |
442 | token = lexer->last_token; | |
443 | ||
444 | /* Get a new token from the preprocessor. */ | |
445 | cp_lexer_get_preprocessor_token (lexer, token); | |
446 | ||
447 | /* Increment LAST_TOKEN. */ | |
448 | lexer->last_token = cp_lexer_next_token (lexer, token); | |
449 | ||
450 | /* The preprocessor does not yet do translation phase six, i.e., the | |
451 | combination of adjacent string literals. Therefore, we do it | |
452 | here. */ | |
453 | if (token->type == CPP_STRING || token->type == CPP_WSTRING) | |
454 | { | |
455 | ptrdiff_t delta; | |
456 | int i; | |
457 | ||
458 | /* When we grow the buffer, we may invalidate TOKEN. So, save | |
459 | the distance from the beginning of the BUFFER so that we can | |
460 | recaulate it. */ | |
461 | delta = cp_lexer_token_difference (lexer, lexer->buffer, token); | |
462 | /* Make sure there is room in the buffer for another token. */ | |
463 | cp_lexer_maybe_grow_buffer (lexer); | |
464 | /* Restore TOKEN. */ | |
465 | token = lexer->buffer; | |
466 | for (i = 0; i < delta; ++i) | |
467 | token = cp_lexer_next_token (lexer, token); | |
468 | ||
469 | VARRAY_PUSH_TREE (lexer->string_tokens, token->value); | |
470 | while (true) | |
471 | { | |
472 | /* Read the token after TOKEN. */ | |
473 | cp_lexer_get_preprocessor_token (lexer, lexer->last_token); | |
474 | /* See whether it's another string constant. */ | |
475 | if (lexer->last_token->type != token->type) | |
476 | { | |
477 | /* If not, then it will be the next real token. */ | |
478 | lexer->last_token = cp_lexer_next_token (lexer, | |
479 | lexer->last_token); | |
480 | break; | |
481 | } | |
482 | ||
483 | /* Chain the strings together. */ | |
484 | VARRAY_PUSH_TREE (lexer->string_tokens, | |
485 | lexer->last_token->value); | |
486 | } | |
487 | ||
488 | /* Create a single STRING_CST. Curiously we have to call | |
489 | combine_strings even if there is only a single string in | |
490 | order to get the type set correctly. */ | |
491 | token->value = combine_strings (lexer->string_tokens); | |
492 | VARRAY_CLEAR (lexer->string_tokens); | |
493 | token->value = fix_string_type (token->value); | |
494 | /* Strings should have type `const char []'. Right now, we will | |
495 | have an ARRAY_TYPE that is constant rather than an array of | |
496 | constant elements. */ | |
497 | if (flag_const_strings) | |
498 | { | |
499 | tree type; | |
500 | ||
501 | /* Get the current type. It will be an ARRAY_TYPE. */ | |
502 | type = TREE_TYPE (token->value); | |
503 | /* Use build_cplus_array_type to rebuild the array, thereby | |
504 | getting the right type. */ | |
505 | type = build_cplus_array_type (TREE_TYPE (type), | |
506 | TYPE_DOMAIN (type)); | |
507 | /* Reset the type of the token. */ | |
508 | TREE_TYPE (token->value) = type; | |
509 | } | |
510 | } | |
511 | ||
512 | return token; | |
513 | } | |
514 | ||
515 | /* If the circular buffer is full, make it bigger. */ | |
516 | ||
517 | static void | |
518 | cp_lexer_maybe_grow_buffer (lexer) | |
519 | cp_lexer *lexer; | |
520 | { | |
521 | /* If the buffer is full, enlarge it. */ | |
522 | if (lexer->last_token == lexer->first_token) | |
523 | { | |
524 | cp_token *new_buffer; | |
525 | cp_token *old_buffer; | |
526 | cp_token *new_first_token; | |
527 | ptrdiff_t buffer_length; | |
528 | size_t num_tokens_to_copy; | |
529 | ||
530 | /* Remember the current buffer pointer. It will become invalid, | |
531 | but we will need to do pointer arithmetic involving this | |
532 | value. */ | |
533 | old_buffer = lexer->buffer; | |
534 | /* Compute the current buffer size. */ | |
535 | buffer_length = lexer->buffer_end - lexer->buffer; | |
536 | /* Allocate a buffer twice as big. */ | |
537 | new_buffer = ((cp_token *) | |
538 | ggc_realloc (lexer->buffer, | |
539 | 2 * buffer_length * sizeof (cp_token))); | |
540 | ||
541 | /* Because the buffer is circular, logically consecutive tokens | |
542 | are not necessarily placed consecutively in memory. | |
543 | Therefore, we must keep move the tokens that were before | |
544 | FIRST_TOKEN to the second half of the newly allocated | |
545 | buffer. */ | |
546 | num_tokens_to_copy = (lexer->first_token - old_buffer); | |
547 | memcpy (new_buffer + buffer_length, | |
548 | new_buffer, | |
549 | num_tokens_to_copy * sizeof (cp_token)); | |
550 | /* Clear the rest of the buffer. We never look at this storage, | |
551 | but the garbage collector may. */ | |
552 | memset (new_buffer + buffer_length + num_tokens_to_copy, 0, | |
553 | (buffer_length - num_tokens_to_copy) * sizeof (cp_token)); | |
554 | ||
555 | /* Now recompute all of the buffer pointers. */ | |
556 | new_first_token | |
557 | = new_buffer + (lexer->first_token - old_buffer); | |
558 | if (lexer->next_token != NULL) | |
559 | { | |
560 | ptrdiff_t next_token_delta; | |
561 | ||
562 | if (lexer->next_token > lexer->first_token) | |
563 | next_token_delta = lexer->next_token - lexer->first_token; | |
564 | else | |
565 | next_token_delta = | |
566 | buffer_length - (lexer->first_token - lexer->next_token); | |
567 | lexer->next_token = new_first_token + next_token_delta; | |
568 | } | |
569 | lexer->last_token = new_first_token + buffer_length; | |
570 | lexer->buffer = new_buffer; | |
571 | lexer->buffer_end = new_buffer + buffer_length * 2; | |
572 | lexer->first_token = new_first_token; | |
573 | } | |
574 | } | |
575 | ||
576 | /* Store the next token from the preprocessor in *TOKEN. */ | |
577 | ||
578 | static void | |
579 | cp_lexer_get_preprocessor_token (lexer, token) | |
580 | cp_lexer *lexer ATTRIBUTE_UNUSED; | |
581 | cp_token *token; | |
582 | { | |
583 | bool done; | |
584 | ||
585 | /* If this not the main lexer, return a terminating CPP_EOF token. */ | |
586 | if (!lexer->main_lexer_p) | |
587 | { | |
588 | token->type = CPP_EOF; | |
589 | token->line_number = 0; | |
590 | token->file_name = NULL; | |
591 | token->value = NULL_TREE; | |
592 | token->keyword = RID_MAX; | |
593 | ||
594 | return; | |
595 | } | |
596 | ||
597 | done = false; | |
598 | /* Keep going until we get a token we like. */ | |
599 | while (!done) | |
600 | { | |
601 | /* Get a new token from the preprocessor. */ | |
602 | token->type = c_lex (&token->value); | |
603 | /* Issue messages about tokens we cannot process. */ | |
604 | switch (token->type) | |
605 | { | |
606 | case CPP_ATSIGN: | |
607 | case CPP_HASH: | |
608 | case CPP_PASTE: | |
609 | error ("invalid token"); | |
610 | break; | |
611 | ||
612 | case CPP_OTHER: | |
613 | /* These tokens are already warned about by c_lex. */ | |
614 | break; | |
615 | ||
616 | default: | |
617 | /* This is a good token, so we exit the loop. */ | |
618 | done = true; | |
619 | break; | |
620 | } | |
621 | } | |
622 | /* Now we've got our token. */ | |
623 | token->line_number = lineno; | |
624 | token->file_name = input_filename; | |
625 | ||
626 | /* Check to see if this token is a keyword. */ | |
627 | if (token->type == CPP_NAME | |
628 | && C_IS_RESERVED_WORD (token->value)) | |
629 | { | |
630 | /* Mark this token as a keyword. */ | |
631 | token->type = CPP_KEYWORD; | |
632 | /* Record which keyword. */ | |
633 | token->keyword = C_RID_CODE (token->value); | |
634 | /* Update the value. Some keywords are mapped to particular | |
635 | entities, rather than simply having the value of the | |
636 | corresponding IDENTIFIER_NODE. For example, `__const' is | |
637 | mapped to `const'. */ | |
638 | token->value = ridpointers[token->keyword]; | |
639 | } | |
640 | else | |
641 | token->keyword = RID_MAX; | |
642 | } | |
643 | ||
644 | /* Return a pointer to the next token in the token stream, but do not | |
645 | consume it. */ | |
646 | ||
647 | static cp_token * | |
648 | cp_lexer_peek_token (lexer) | |
649 | cp_lexer *lexer; | |
650 | { | |
651 | cp_token *token; | |
652 | ||
653 | /* If there are no tokens, read one now. */ | |
654 | if (!lexer->next_token) | |
655 | cp_lexer_read_token (lexer); | |
656 | ||
657 | /* Provide debugging output. */ | |
658 | if (cp_lexer_debugging_p (lexer)) | |
659 | { | |
660 | fprintf (cp_lexer_debug_stream, "cp_lexer: peeking at token: "); | |
661 | cp_lexer_print_token (cp_lexer_debug_stream, lexer->next_token); | |
662 | fprintf (cp_lexer_debug_stream, "\n"); | |
663 | } | |
664 | ||
665 | token = lexer->next_token; | |
666 | cp_lexer_set_source_position_from_token (lexer, token); | |
667 | return token; | |
668 | } | |
669 | ||
670 | /* Return true if the next token has the indicated TYPE. */ | |
671 | ||
672 | static bool | |
673 | cp_lexer_next_token_is (lexer, type) | |
674 | cp_lexer *lexer; | |
675 | enum cpp_ttype type; | |
676 | { | |
677 | cp_token *token; | |
678 | ||
679 | /* Peek at the next token. */ | |
680 | token = cp_lexer_peek_token (lexer); | |
681 | /* Check to see if it has the indicated TYPE. */ | |
682 | return token->type == type; | |
683 | } | |
684 | ||
685 | /* Return true if the next token does not have the indicated TYPE. */ | |
686 | ||
687 | static bool | |
688 | cp_lexer_next_token_is_not (lexer, type) | |
689 | cp_lexer *lexer; | |
690 | enum cpp_ttype type; | |
691 | { | |
692 | return !cp_lexer_next_token_is (lexer, type); | |
693 | } | |
694 | ||
695 | /* Return true if the next token is the indicated KEYWORD. */ | |
696 | ||
697 | static bool | |
698 | cp_lexer_next_token_is_keyword (lexer, keyword) | |
699 | cp_lexer *lexer; | |
700 | enum rid keyword; | |
701 | { | |
702 | cp_token *token; | |
703 | ||
704 | /* Peek at the next token. */ | |
705 | token = cp_lexer_peek_token (lexer); | |
706 | /* Check to see if it is the indicated keyword. */ | |
707 | return token->keyword == keyword; | |
708 | } | |
709 | ||
710 | /* Return a pointer to the Nth token in the token stream. If N is 1, | |
711 | then this is precisely equivalent to cp_lexer_peek_token. */ | |
712 | ||
713 | static cp_token * | |
714 | cp_lexer_peek_nth_token (lexer, n) | |
715 | cp_lexer *lexer; | |
716 | size_t n; | |
717 | { | |
718 | cp_token *token; | |
719 | ||
720 | /* N is 1-based, not zero-based. */ | |
721 | my_friendly_assert (n > 0, 20000224); | |
722 | ||
723 | /* Skip ahead from NEXT_TOKEN, reading more tokens as necessary. */ | |
724 | token = lexer->next_token; | |
725 | /* If there are no tokens in the buffer, get one now. */ | |
726 | if (!token) | |
727 | { | |
728 | cp_lexer_read_token (lexer); | |
729 | token = lexer->next_token; | |
730 | } | |
731 | ||
732 | /* Now, read tokens until we have enough. */ | |
733 | while (--n > 0) | |
734 | { | |
735 | /* Advance to the next token. */ | |
736 | token = cp_lexer_next_token (lexer, token); | |
737 | /* If that's all the tokens we have, read a new one. */ | |
738 | if (token == lexer->last_token) | |
739 | token = cp_lexer_read_token (lexer); | |
740 | } | |
741 | ||
742 | return token; | |
743 | } | |
744 | ||
745 | /* Consume the next token. The pointer returned is valid only until | |
746 | another token is read. Callers should preserve copy the token | |
747 | explicitly if they will need its value for a longer period of | |
748 | time. */ | |
749 | ||
750 | static cp_token * | |
751 | cp_lexer_consume_token (lexer) | |
752 | cp_lexer *lexer; | |
753 | { | |
754 | cp_token *token; | |
755 | ||
756 | /* If there are no tokens, read one now. */ | |
757 | if (!lexer->next_token) | |
758 | cp_lexer_read_token (lexer); | |
759 | ||
760 | /* Remember the token we'll be returning. */ | |
761 | token = lexer->next_token; | |
762 | ||
763 | /* Increment NEXT_TOKEN. */ | |
764 | lexer->next_token = cp_lexer_next_token (lexer, | |
765 | lexer->next_token); | |
766 | /* Check to see if we're all out of tokens. */ | |
767 | if (lexer->next_token == lexer->last_token) | |
768 | lexer->next_token = NULL; | |
769 | ||
770 | /* If we're not saving tokens, then move FIRST_TOKEN too. */ | |
771 | if (!cp_lexer_saving_tokens (lexer)) | |
772 | { | |
773 | /* If there are no tokens available, set FIRST_TOKEN to NULL. */ | |
774 | if (!lexer->next_token) | |
775 | lexer->first_token = NULL; | |
776 | else | |
777 | lexer->first_token = lexer->next_token; | |
778 | } | |
779 | ||
780 | /* Provide debugging output. */ | |
781 | if (cp_lexer_debugging_p (lexer)) | |
782 | { | |
783 | fprintf (cp_lexer_debug_stream, "cp_lexer: consuming token: "); | |
784 | cp_lexer_print_token (cp_lexer_debug_stream, token); | |
785 | fprintf (cp_lexer_debug_stream, "\n"); | |
786 | } | |
787 | ||
788 | return token; | |
789 | } | |
790 | ||
791 | /* Permanently remove the next token from the token stream. There | |
792 | must be a valid next token already; this token never reads | |
793 | additional tokens from the preprocessor. */ | |
794 | ||
795 | static void | |
796 | cp_lexer_purge_token (cp_lexer *lexer) | |
797 | { | |
798 | cp_token *token; | |
799 | cp_token *next_token; | |
800 | ||
801 | token = lexer->next_token; | |
802 | while (true) | |
803 | { | |
804 | next_token = cp_lexer_next_token (lexer, token); | |
805 | if (next_token == lexer->last_token) | |
806 | break; | |
807 | *token = *next_token; | |
808 | token = next_token; | |
809 | } | |
810 | ||
811 | lexer->last_token = token; | |
812 | /* The token purged may have been the only token remaining; if so, | |
813 | clear NEXT_TOKEN. */ | |
814 | if (lexer->next_token == token) | |
815 | lexer->next_token = NULL; | |
816 | } | |
817 | ||
818 | /* Permanently remove all tokens after TOKEN, up to, but not | |
819 | including, the token that will be returned next by | |
820 | cp_lexer_peek_token. */ | |
821 | ||
822 | static void | |
823 | cp_lexer_purge_tokens_after (cp_lexer *lexer, cp_token *token) | |
824 | { | |
825 | cp_token *peek; | |
826 | cp_token *t1; | |
827 | cp_token *t2; | |
828 | ||
829 | if (lexer->next_token) | |
830 | { | |
831 | /* Copy the tokens that have not yet been read to the location | |
832 | immediately following TOKEN. */ | |
833 | t1 = cp_lexer_next_token (lexer, token); | |
834 | t2 = peek = cp_lexer_peek_token (lexer); | |
835 | /* Move tokens into the vacant area between TOKEN and PEEK. */ | |
836 | while (t2 != lexer->last_token) | |
837 | { | |
838 | *t1 = *t2; | |
839 | t1 = cp_lexer_next_token (lexer, t1); | |
840 | t2 = cp_lexer_next_token (lexer, t2); | |
841 | } | |
842 | /* Now, the next available token is right after TOKEN. */ | |
843 | lexer->next_token = cp_lexer_next_token (lexer, token); | |
844 | /* And the last token is wherever we ended up. */ | |
845 | lexer->last_token = t1; | |
846 | } | |
847 | else | |
848 | { | |
849 | /* There are no tokens in the buffer, so there is nothing to | |
850 | copy. The last token in the buffer is TOKEN itself. */ | |
851 | lexer->last_token = cp_lexer_next_token (lexer, token); | |
852 | } | |
853 | } | |
854 | ||
855 | /* Begin saving tokens. All tokens consumed after this point will be | |
856 | preserved. */ | |
857 | ||
858 | static void | |
859 | cp_lexer_save_tokens (lexer) | |
860 | cp_lexer *lexer; | |
861 | { | |
862 | /* Provide debugging output. */ | |
863 | if (cp_lexer_debugging_p (lexer)) | |
864 | fprintf (cp_lexer_debug_stream, "cp_lexer: saving tokens\n"); | |
865 | ||
866 | /* Make sure that LEXER->NEXT_TOKEN is non-NULL so that we can | |
867 | restore the tokens if required. */ | |
868 | if (!lexer->next_token) | |
869 | cp_lexer_read_token (lexer); | |
870 | ||
871 | VARRAY_PUSH_INT (lexer->saved_tokens, | |
872 | cp_lexer_token_difference (lexer, | |
873 | lexer->first_token, | |
874 | lexer->next_token)); | |
875 | } | |
876 | ||
877 | /* Commit to the portion of the token stream most recently saved. */ | |
878 | ||
879 | static void | |
880 | cp_lexer_commit_tokens (lexer) | |
881 | cp_lexer *lexer; | |
882 | { | |
883 | /* Provide debugging output. */ | |
884 | if (cp_lexer_debugging_p (lexer)) | |
885 | fprintf (cp_lexer_debug_stream, "cp_lexer: committing tokens\n"); | |
886 | ||
887 | VARRAY_POP (lexer->saved_tokens); | |
888 | } | |
889 | ||
890 | /* Return all tokens saved since the last call to cp_lexer_save_tokens | |
891 | to the token stream. Stop saving tokens. */ | |
892 | ||
893 | static void | |
894 | cp_lexer_rollback_tokens (lexer) | |
895 | cp_lexer *lexer; | |
896 | { | |
897 | size_t delta; | |
898 | ||
899 | /* Provide debugging output. */ | |
900 | if (cp_lexer_debugging_p (lexer)) | |
901 | fprintf (cp_lexer_debug_stream, "cp_lexer: restoring tokens\n"); | |
902 | ||
903 | /* Find the token that was the NEXT_TOKEN when we started saving | |
904 | tokens. */ | |
905 | delta = VARRAY_TOP_INT(lexer->saved_tokens); | |
906 | /* Make it the next token again now. */ | |
907 | lexer->next_token = cp_lexer_advance_token (lexer, | |
908 | lexer->first_token, | |
909 | delta); | |
910 | /* It might be the case that there wer no tokens when we started | |
911 | saving tokens, but that there are some tokens now. */ | |
912 | if (!lexer->next_token && lexer->first_token) | |
913 | lexer->next_token = lexer->first_token; | |
914 | ||
915 | /* Stop saving tokens. */ | |
916 | VARRAY_POP (lexer->saved_tokens); | |
917 | } | |
918 | ||
919 | /* Set the current source position from the information stored in | |
920 | TOKEN. */ | |
921 | ||
922 | static void | |
923 | cp_lexer_set_source_position_from_token (lexer, token) | |
924 | cp_lexer *lexer ATTRIBUTE_UNUSED; | |
925 | const cp_token *token; | |
926 | { | |
927 | /* Ideally, the source position information would not be a global | |
928 | variable, but it is. */ | |
929 | ||
930 | /* Update the line number. */ | |
931 | if (token->type != CPP_EOF) | |
932 | { | |
933 | lineno = token->line_number; | |
934 | input_filename = token->file_name; | |
935 | } | |
936 | } | |
937 | ||
938 | /* Print a representation of the TOKEN on the STREAM. */ | |
939 | ||
940 | static void | |
941 | cp_lexer_print_token (stream, token) | |
942 | FILE *stream; | |
943 | cp_token *token; | |
944 | { | |
945 | const char *token_type = NULL; | |
946 | ||
947 | /* Figure out what kind of token this is. */ | |
948 | switch (token->type) | |
949 | { | |
950 | case CPP_EQ: | |
951 | token_type = "EQ"; | |
952 | break; | |
953 | ||
954 | case CPP_COMMA: | |
955 | token_type = "COMMA"; | |
956 | break; | |
957 | ||
958 | case CPP_OPEN_PAREN: | |
959 | token_type = "OPEN_PAREN"; | |
960 | break; | |
961 | ||
962 | case CPP_CLOSE_PAREN: | |
963 | token_type = "CLOSE_PAREN"; | |
964 | break; | |
965 | ||
966 | case CPP_OPEN_BRACE: | |
967 | token_type = "OPEN_BRACE"; | |
968 | break; | |
969 | ||
970 | case CPP_CLOSE_BRACE: | |
971 | token_type = "CLOSE_BRACE"; | |
972 | break; | |
973 | ||
974 | case CPP_SEMICOLON: | |
975 | token_type = "SEMICOLON"; | |
976 | break; | |
977 | ||
978 | case CPP_NAME: | |
979 | token_type = "NAME"; | |
980 | break; | |
981 | ||
982 | case CPP_EOF: | |
983 | token_type = "EOF"; | |
984 | break; | |
985 | ||
986 | case CPP_KEYWORD: | |
987 | token_type = "keyword"; | |
988 | break; | |
989 | ||
990 | /* This is not a token that we know how to handle yet. */ | |
991 | default: | |
992 | break; | |
993 | } | |
994 | ||
995 | /* If we have a name for the token, print it out. Otherwise, we | |
996 | simply give the numeric code. */ | |
997 | if (token_type) | |
998 | fprintf (stream, "%s", token_type); | |
999 | else | |
1000 | fprintf (stream, "%d", token->type); | |
1001 | /* And, for an identifier, print the identifier name. */ | |
1002 | if (token->type == CPP_NAME | |
1003 | /* Some keywords have a value that is not an IDENTIFIER_NODE. | |
1004 | For example, `struct' is mapped to an INTEGER_CST. */ | |
1005 | || (token->type == CPP_KEYWORD | |
1006 | && TREE_CODE (token->value) == IDENTIFIER_NODE)) | |
1007 | fprintf (stream, " %s", IDENTIFIER_POINTER (token->value)); | |
1008 | } | |
1009 | ||
1010 | /* Returns non-zero if debugging information should be output. */ | |
1011 | ||
1012 | static bool | |
1013 | cp_lexer_debugging_p (lexer) | |
1014 | cp_lexer *lexer; | |
1015 | { | |
1016 | return lexer->debugging_p; | |
1017 | } | |
1018 | ||
1019 | /* Start emitting debugging information. */ | |
1020 | ||
1021 | static void | |
1022 | cp_lexer_start_debugging (lexer) | |
1023 | cp_lexer *lexer; | |
1024 | { | |
1025 | ++lexer->debugging_p; | |
1026 | } | |
1027 | ||
1028 | /* Stop emitting debugging information. */ | |
1029 | ||
1030 | static void | |
1031 | cp_lexer_stop_debugging (lexer) | |
1032 | cp_lexer *lexer; | |
1033 | { | |
1034 | --lexer->debugging_p; | |
1035 | } | |
1036 | ||
1037 | \f | |
1038 | /* The parser. */ | |
1039 | ||
1040 | /* Overview | |
1041 | -------- | |
1042 | ||
1043 | A cp_parser parses the token stream as specified by the C++ | |
1044 | grammar. Its job is purely parsing, not semantic analysis. For | |
1045 | example, the parser breaks the token stream into declarators, | |
1046 | expressions, statements, and other similar syntactic constructs. | |
1047 | It does not check that the types of the expressions on either side | |
1048 | of an assignment-statement are compatible, or that a function is | |
1049 | not declared with a parameter of type `void'. | |
1050 | ||
1051 | The parser invokes routines elsewhere in the compiler to perform | |
1052 | semantic analysis and to build up the abstract syntax tree for the | |
1053 | code processed. | |
1054 | ||
1055 | The parser (and the template instantiation code, which is, in a | |
1056 | way, a close relative of parsing) are the only parts of the | |
1057 | compiler that should be calling push_scope and pop_scope, or | |
1058 | related functions. The parser (and template instantiation code) | |
1059 | keeps track of what scope is presently active; everything else | |
1060 | should simply honor that. (The code that generates static | |
1061 | initializers may also need to set the scope, in order to check | |
1062 | access control correctly when emitting the initializers.) | |
1063 | ||
1064 | Methodology | |
1065 | ----------- | |
1066 | ||
1067 | The parser is of the standard recursive-descent variety. Upcoming | |
1068 | tokens in the token stream are examined in order to determine which | |
1069 | production to use when parsing a non-terminal. Some C++ constructs | |
1070 | require arbitrary look ahead to disambiguate. For example, it is | |
1071 | impossible, in the general case, to tell whether a statement is an | |
1072 | expression or declaration without scanning the entire statement. | |
1073 | Therefore, the parser is capable of "parsing tentatively." When the | |
1074 | parser is not sure what construct comes next, it enters this mode. | |
1075 | Then, while we attempt to parse the construct, the parser queues up | |
1076 | error messages, rather than issuing them immediately, and saves the | |
1077 | tokens it consumes. If the construct is parsed successfully, the | |
1078 | parser "commits", i.e., it issues any queued error messages and | |
1079 | the tokens that were being preserved are permanently discarded. | |
1080 | If, however, the construct is not parsed successfully, the parser | |
1081 | rolls back its state completely so that it can resume parsing using | |
1082 | a different alternative. | |
1083 | ||
1084 | Future Improvements | |
1085 | ------------------- | |
1086 | ||
1087 | The performance of the parser could probably be improved | |
1088 | substantially. Some possible improvements include: | |
1089 | ||
1090 | - The expression parser recurses through the various levels of | |
1091 | precedence as specified in the grammar, rather than using an | |
1092 | operator-precedence technique. Therefore, parsing a simple | |
1093 | identifier requires multiple recursive calls. | |
1094 | ||
1095 | - We could often eliminate the need to parse tentatively by | |
1096 | looking ahead a little bit. In some places, this approach | |
1097 | might not entirely eliminate the need to parse tentatively, but | |
1098 | it might still speed up the average case. */ | |
1099 | ||
1100 | /* Flags that are passed to some parsing functions. These values can | |
1101 | be bitwise-ored together. */ | |
1102 | ||
1103 | typedef enum cp_parser_flags | |
1104 | { | |
1105 | /* No flags. */ | |
1106 | CP_PARSER_FLAGS_NONE = 0x0, | |
1107 | /* The construct is optional. If it is not present, then no error | |
1108 | should be issued. */ | |
1109 | CP_PARSER_FLAGS_OPTIONAL = 0x1, | |
1110 | /* When parsing a type-specifier, do not allow user-defined types. */ | |
1111 | CP_PARSER_FLAGS_NO_USER_DEFINED_TYPES = 0x2 | |
1112 | } cp_parser_flags; | |
1113 | ||
1114 | /* The different kinds of ids that we ecounter. */ | |
1115 | ||
1116 | typedef enum cp_parser_id_kind | |
1117 | { | |
1118 | /* Not an id at all. */ | |
1119 | CP_PARSER_ID_KIND_NONE, | |
1120 | /* An unqualified-id that is not a template-id. */ | |
1121 | CP_PARSER_ID_KIND_UNQUALIFIED, | |
1122 | /* An unqualified template-id. */ | |
1123 | CP_PARSER_ID_KIND_TEMPLATE_ID, | |
1124 | /* A qualified-id. */ | |
1125 | CP_PARSER_ID_KIND_QUALIFIED | |
1126 | } cp_parser_id_kind; | |
1127 | ||
1128 | /* A mapping from a token type to a corresponding tree node type. */ | |
1129 | ||
1130 | typedef struct cp_parser_token_tree_map_node | |
1131 | { | |
1132 | /* The token type. */ | |
1133 | enum cpp_ttype token_type; | |
1134 | /* The corresponding tree code. */ | |
1135 | enum tree_code tree_type; | |
1136 | } cp_parser_token_tree_map_node; | |
1137 | ||
1138 | /* A complete map consists of several ordinary entries, followed by a | |
1139 | terminator. The terminating entry has a token_type of CPP_EOF. */ | |
1140 | ||
1141 | typedef cp_parser_token_tree_map_node cp_parser_token_tree_map[]; | |
1142 | ||
1143 | /* The status of a tentative parse. */ | |
1144 | ||
1145 | typedef enum cp_parser_status_kind | |
1146 | { | |
1147 | /* No errors have occurred. */ | |
1148 | CP_PARSER_STATUS_KIND_NO_ERROR, | |
1149 | /* An error has occurred. */ | |
1150 | CP_PARSER_STATUS_KIND_ERROR, | |
1151 | /* We are committed to this tentative parse, whether or not an error | |
1152 | has occurred. */ | |
1153 | CP_PARSER_STATUS_KIND_COMMITTED | |
1154 | } cp_parser_status_kind; | |
1155 | ||
1156 | /* Context that is saved and restored when parsing tentatively. */ | |
1157 | ||
1158 | typedef struct cp_parser_context GTY (()) | |
1159 | { | |
1160 | /* If this is a tentative parsing context, the status of the | |
1161 | tentative parse. */ | |
1162 | enum cp_parser_status_kind status; | |
1163 | /* If non-NULL, we have just seen a `x->' or `x.' expression. Names | |
1164 | that are looked up in this context must be looked up both in the | |
1165 | scope given by OBJECT_TYPE (the type of `x' or `*x') and also in | |
1166 | the context of the containing expression. */ | |
1167 | tree object_type; | |
1168 | /* A TREE_LIST representing name-lookups for which we have deferred | |
1169 | checking access controls. We cannot check the accessibility of | |
1170 | names used in a decl-specifier-seq until we know what is being | |
1171 | declared because code like: | |
1172 | ||
1173 | class A { | |
1174 | class B {}; | |
1175 | B* f(); | |
1176 | } | |
1177 | ||
1178 | A::B* A::f() { return 0; } | |
1179 | ||
1180 | is valid, even though `A::B' is not generally accessible. | |
1181 | ||
1182 | The TREE_PURPOSE of each node is the scope used to qualify the | |
1183 | name being looked up; the TREE_VALUE is the DECL to which the | |
1184 | name was resolved. */ | |
1185 | tree deferred_access_checks; | |
1186 | /* TRUE iff we are deferring access checks. */ | |
1187 | bool deferring_access_checks_p; | |
1188 | /* The next parsing context in the stack. */ | |
1189 | struct cp_parser_context *next; | |
1190 | } cp_parser_context; | |
1191 | ||
1192 | /* Prototypes. */ | |
1193 | ||
1194 | /* Constructors and destructors. */ | |
1195 | ||
1196 | static cp_parser_context *cp_parser_context_new | |
1197 | PARAMS ((cp_parser_context *)); | |
1198 | ||
1199 | /* Constructors and destructors. */ | |
1200 | ||
1201 | /* Construct a new context. The context below this one on the stack | |
1202 | is given by NEXT. */ | |
1203 | ||
1204 | static cp_parser_context * | |
1205 | cp_parser_context_new (next) | |
1206 | cp_parser_context *next; | |
1207 | { | |
1208 | cp_parser_context *context; | |
1209 | ||
1210 | /* Allocate the storage. */ | |
1211 | context = ((cp_parser_context *) | |
1212 | ggc_alloc_cleared (sizeof (cp_parser_context))); | |
1213 | /* No errors have occurred yet in this context. */ | |
1214 | context->status = CP_PARSER_STATUS_KIND_NO_ERROR; | |
1215 | /* If this is not the bottomost context, copy information that we | |
1216 | need from the previous context. */ | |
1217 | if (next) | |
1218 | { | |
1219 | /* If, in the NEXT context, we are parsing an `x->' or `x.' | |
1220 | expression, then we are parsing one in this context, too. */ | |
1221 | context->object_type = next->object_type; | |
1222 | /* We are deferring access checks here if we were in the NEXT | |
1223 | context. */ | |
1224 | context->deferring_access_checks_p | |
1225 | = next->deferring_access_checks_p; | |
1226 | /* Thread the stack. */ | |
1227 | context->next = next; | |
1228 | } | |
1229 | ||
1230 | return context; | |
1231 | } | |
1232 | ||
1233 | /* The cp_parser structure represents the C++ parser. */ | |
1234 | ||
1235 | typedef struct cp_parser GTY(()) | |
1236 | { | |
1237 | /* The lexer from which we are obtaining tokens. */ | |
1238 | cp_lexer *lexer; | |
1239 | ||
1240 | /* The scope in which names should be looked up. If NULL_TREE, then | |
1241 | we look up names in the scope that is currently open in the | |
1242 | source program. If non-NULL, this is either a TYPE or | |
1243 | NAMESPACE_DECL for the scope in which we should look. | |
1244 | ||
1245 | This value is not cleared automatically after a name is looked | |
1246 | up, so we must be careful to clear it before starting a new look | |
1247 | up sequence. (If it is not cleared, then `X::Y' followed by `Z' | |
1248 | will look up `Z' in the scope of `X', rather than the current | |
1249 | scope.) Unfortunately, it is difficult to tell when name lookup | |
1250 | is complete, because we sometimes peek at a token, look it up, | |
1251 | and then decide not to consume it. */ | |
1252 | tree scope; | |
1253 | ||
1254 | /* OBJECT_SCOPE and QUALIFYING_SCOPE give the scopes in which the | |
1255 | last lookup took place. OBJECT_SCOPE is used if an expression | |
1256 | like "x->y" or "x.y" was used; it gives the type of "*x" or "x", | |
1257 | respectively. QUALIFYING_SCOPE is used for an expression of the | |
1258 | form "X::Y"; it refers to X. */ | |
1259 | tree object_scope; | |
1260 | tree qualifying_scope; | |
1261 | ||
1262 | /* A stack of parsing contexts. All but the bottom entry on the | |
1263 | stack will be tentative contexts. | |
1264 | ||
1265 | We parse tentatively in order to determine which construct is in | |
1266 | use in some situations. For example, in order to determine | |
1267 | whether a statement is an expression-statement or a | |
1268 | declaration-statement we parse it tentatively as a | |
1269 | declaration-statement. If that fails, we then reparse the same | |
1270 | token stream as an expression-statement. */ | |
1271 | cp_parser_context *context; | |
1272 | ||
1273 | /* True if we are parsing GNU C++. If this flag is not set, then | |
1274 | GNU extensions are not recognized. */ | |
1275 | bool allow_gnu_extensions_p; | |
1276 | ||
1277 | /* TRUE if the `>' token should be interpreted as the greater-than | |
1278 | operator. FALSE if it is the end of a template-id or | |
1279 | template-parameter-list. */ | |
1280 | bool greater_than_is_operator_p; | |
1281 | ||
1282 | /* TRUE if default arguments are allowed within a parameter list | |
1283 | that starts at this point. FALSE if only a gnu extension makes | |
1284 | them permissable. */ | |
1285 | bool default_arg_ok_p; | |
1286 | ||
1287 | /* TRUE if we are parsing an integral constant-expression. See | |
1288 | [expr.const] for a precise definition. */ | |
1289 | /* FIXME: Need to implement code that checks this flag. */ | |
1290 | bool constant_expression_p; | |
1291 | ||
1292 | /* TRUE if local variable names and `this' are forbidden in the | |
1293 | current context. */ | |
1294 | bool local_variables_forbidden_p; | |
1295 | ||
1296 | /* TRUE if the declaration we are parsing is part of a | |
1297 | linkage-specification of the form `extern string-literal | |
1298 | declaration'. */ | |
1299 | bool in_unbraced_linkage_specification_p; | |
1300 | ||
1301 | /* TRUE if we are presently parsing a declarator, after the | |
1302 | direct-declarator. */ | |
1303 | bool in_declarator_p; | |
1304 | ||
1305 | /* If non-NULL, then we are parsing a construct where new type | |
1306 | definitions are not permitted. The string stored here will be | |
1307 | issued as an error message if a type is defined. */ | |
1308 | const char *type_definition_forbidden_message; | |
1309 | ||
1310 | /* List of FUNCTION_TYPEs which contain unprocessed DEFAULT_ARGs | |
1311 | during class parsing, and are not FUNCTION_DECLs. G++ has an | |
1312 | awkward extension allowing default args on pointers to functions | |
1313 | etc. */ | |
1314 | tree default_arg_types; | |
1315 | ||
1316 | /* A TREE_LIST of queues of functions whose bodies have been lexed, | |
1317 | but may not have been parsed. These functions are friends of | |
1318 | members defined within a class-specification; they are not | |
1319 | procssed until the class is complete. The active queue is at the | |
1320 | front of the list. | |
1321 | ||
1322 | Within each queue, functions appear in the reverse order that | |
1323 | they appeared in the source. The TREE_PURPOSE of each node is | |
1324 | the class in which the function was defined or declared; the | |
1325 | TREE_VALUE is the FUNCTION_DECL itself. */ | |
1326 | tree unparsed_functions_queues; | |
1327 | ||
1328 | /* The number of classes whose definitions are currently in | |
1329 | progress. */ | |
1330 | unsigned num_classes_being_defined; | |
1331 | ||
1332 | /* The number of template parameter lists that apply directly to the | |
1333 | current declaration. */ | |
1334 | unsigned num_template_parameter_lists; | |
1335 | } cp_parser; | |
1336 | ||
1337 | /* The type of a function that parses some kind of expression */ | |
1338 | typedef tree (*cp_parser_expression_fn) PARAMS ((cp_parser *)); | |
1339 | ||
1340 | /* Prototypes. */ | |
1341 | ||
1342 | /* Constructors and destructors. */ | |
1343 | ||
1344 | static cp_parser *cp_parser_new | |
1345 | PARAMS ((void)); | |
1346 | ||
1347 | /* Routines to parse various constructs. | |
1348 | ||
1349 | Those that return `tree' will return the error_mark_node (rather | |
1350 | than NULL_TREE) if a parse error occurs, unless otherwise noted. | |
1351 | Sometimes, they will return an ordinary node if error-recovery was | |
1352 | attempted, even though a parse error occurrred. So, to check | |
1353 | whether or not a parse error occurred, you should always use | |
1354 | cp_parser_error_occurred. If the construct is optional (indicated | |
1355 | either by an `_opt' in the name of the function that does the | |
1356 | parsing or via a FLAGS parameter), then NULL_TREE is returned if | |
1357 | the construct is not present. */ | |
1358 | ||
1359 | /* Lexical conventions [gram.lex] */ | |
1360 | ||
1361 | static tree cp_parser_identifier | |
1362 | PARAMS ((cp_parser *)); | |
1363 | ||
1364 | /* Basic concepts [gram.basic] */ | |
1365 | ||
1366 | static bool cp_parser_translation_unit | |
1367 | PARAMS ((cp_parser *)); | |
1368 | ||
1369 | /* Expressions [gram.expr] */ | |
1370 | ||
1371 | static tree cp_parser_primary_expression | |
1372 | (cp_parser *, cp_parser_id_kind *, tree *); | |
1373 | static tree cp_parser_id_expression | |
1374 | PARAMS ((cp_parser *, bool, bool, bool *)); | |
1375 | static tree cp_parser_unqualified_id | |
1376 | PARAMS ((cp_parser *, bool, bool)); | |
1377 | static tree cp_parser_nested_name_specifier_opt | |
1378 | (cp_parser *, bool, bool, bool); | |
1379 | static tree cp_parser_nested_name_specifier | |
1380 | (cp_parser *, bool, bool, bool); | |
1381 | static tree cp_parser_class_or_namespace_name | |
1382 | (cp_parser *, bool, bool, bool, bool); | |
1383 | static tree cp_parser_postfix_expression | |
1384 | (cp_parser *, bool); | |
1385 | static tree cp_parser_expression_list | |
1386 | PARAMS ((cp_parser *)); | |
1387 | static void cp_parser_pseudo_destructor_name | |
1388 | PARAMS ((cp_parser *, tree *, tree *)); | |
1389 | static tree cp_parser_unary_expression | |
1390 | (cp_parser *, bool); | |
1391 | static enum tree_code cp_parser_unary_operator | |
1392 | PARAMS ((cp_token *)); | |
1393 | static tree cp_parser_new_expression | |
1394 | PARAMS ((cp_parser *)); | |
1395 | static tree cp_parser_new_placement | |
1396 | PARAMS ((cp_parser *)); | |
1397 | static tree cp_parser_new_type_id | |
1398 | PARAMS ((cp_parser *)); | |
1399 | static tree cp_parser_new_declarator_opt | |
1400 | PARAMS ((cp_parser *)); | |
1401 | static tree cp_parser_direct_new_declarator | |
1402 | PARAMS ((cp_parser *)); | |
1403 | static tree cp_parser_new_initializer | |
1404 | PARAMS ((cp_parser *)); | |
1405 | static tree cp_parser_delete_expression | |
1406 | PARAMS ((cp_parser *)); | |
1407 | static tree cp_parser_cast_expression | |
1408 | (cp_parser *, bool); | |
1409 | static tree cp_parser_pm_expression | |
1410 | PARAMS ((cp_parser *)); | |
1411 | static tree cp_parser_multiplicative_expression | |
1412 | PARAMS ((cp_parser *)); | |
1413 | static tree cp_parser_additive_expression | |
1414 | PARAMS ((cp_parser *)); | |
1415 | static tree cp_parser_shift_expression | |
1416 | PARAMS ((cp_parser *)); | |
1417 | static tree cp_parser_relational_expression | |
1418 | PARAMS ((cp_parser *)); | |
1419 | static tree cp_parser_equality_expression | |
1420 | PARAMS ((cp_parser *)); | |
1421 | static tree cp_parser_and_expression | |
1422 | PARAMS ((cp_parser *)); | |
1423 | static tree cp_parser_exclusive_or_expression | |
1424 | PARAMS ((cp_parser *)); | |
1425 | static tree cp_parser_inclusive_or_expression | |
1426 | PARAMS ((cp_parser *)); | |
1427 | static tree cp_parser_logical_and_expression | |
1428 | PARAMS ((cp_parser *)); | |
1429 | static tree cp_parser_logical_or_expression | |
1430 | PARAMS ((cp_parser *)); | |
1431 | static tree cp_parser_conditional_expression | |
1432 | PARAMS ((cp_parser *)); | |
1433 | static tree cp_parser_question_colon_clause | |
1434 | PARAMS ((cp_parser *, tree)); | |
1435 | static tree cp_parser_assignment_expression | |
1436 | PARAMS ((cp_parser *)); | |
1437 | static enum tree_code cp_parser_assignment_operator_opt | |
1438 | PARAMS ((cp_parser *)); | |
1439 | static tree cp_parser_expression | |
1440 | PARAMS ((cp_parser *)); | |
1441 | static tree cp_parser_constant_expression | |
1442 | PARAMS ((cp_parser *)); | |
1443 | ||
1444 | /* Statements [gram.stmt.stmt] */ | |
1445 | ||
1446 | static void cp_parser_statement | |
1447 | PARAMS ((cp_parser *)); | |
1448 | static tree cp_parser_labeled_statement | |
1449 | PARAMS ((cp_parser *)); | |
1450 | static tree cp_parser_expression_statement | |
1451 | PARAMS ((cp_parser *)); | |
1452 | static tree cp_parser_compound_statement | |
1453 | (cp_parser *); | |
1454 | static void cp_parser_statement_seq_opt | |
1455 | PARAMS ((cp_parser *)); | |
1456 | static tree cp_parser_selection_statement | |
1457 | PARAMS ((cp_parser *)); | |
1458 | static tree cp_parser_condition | |
1459 | PARAMS ((cp_parser *)); | |
1460 | static tree cp_parser_iteration_statement | |
1461 | PARAMS ((cp_parser *)); | |
1462 | static void cp_parser_for_init_statement | |
1463 | PARAMS ((cp_parser *)); | |
1464 | static tree cp_parser_jump_statement | |
1465 | PARAMS ((cp_parser *)); | |
1466 | static void cp_parser_declaration_statement | |
1467 | PARAMS ((cp_parser *)); | |
1468 | ||
1469 | static tree cp_parser_implicitly_scoped_statement | |
1470 | PARAMS ((cp_parser *)); | |
1471 | static void cp_parser_already_scoped_statement | |
1472 | PARAMS ((cp_parser *)); | |
1473 | ||
1474 | /* Declarations [gram.dcl.dcl] */ | |
1475 | ||
1476 | static void cp_parser_declaration_seq_opt | |
1477 | PARAMS ((cp_parser *)); | |
1478 | static void cp_parser_declaration | |
1479 | PARAMS ((cp_parser *)); | |
1480 | static void cp_parser_block_declaration | |
1481 | PARAMS ((cp_parser *, bool)); | |
1482 | static void cp_parser_simple_declaration | |
1483 | PARAMS ((cp_parser *, bool)); | |
1484 | static tree cp_parser_decl_specifier_seq | |
1485 | PARAMS ((cp_parser *, cp_parser_flags, tree *, bool *)); | |
1486 | static tree cp_parser_storage_class_specifier_opt | |
1487 | PARAMS ((cp_parser *)); | |
1488 | static tree cp_parser_function_specifier_opt | |
1489 | PARAMS ((cp_parser *)); | |
1490 | static tree cp_parser_type_specifier | |
1491 | (cp_parser *, cp_parser_flags, bool, bool, bool *, bool *); | |
1492 | static tree cp_parser_simple_type_specifier | |
1493 | PARAMS ((cp_parser *, cp_parser_flags)); | |
1494 | static tree cp_parser_type_name | |
1495 | PARAMS ((cp_parser *)); | |
1496 | static tree cp_parser_elaborated_type_specifier | |
1497 | PARAMS ((cp_parser *, bool, bool)); | |
1498 | static tree cp_parser_enum_specifier | |
1499 | PARAMS ((cp_parser *)); | |
1500 | static void cp_parser_enumerator_list | |
1501 | PARAMS ((cp_parser *, tree)); | |
1502 | static void cp_parser_enumerator_definition | |
1503 | PARAMS ((cp_parser *, tree)); | |
1504 | static tree cp_parser_namespace_name | |
1505 | PARAMS ((cp_parser *)); | |
1506 | static void cp_parser_namespace_definition | |
1507 | PARAMS ((cp_parser *)); | |
1508 | static void cp_parser_namespace_body | |
1509 | PARAMS ((cp_parser *)); | |
1510 | static tree cp_parser_qualified_namespace_specifier | |
1511 | PARAMS ((cp_parser *)); | |
1512 | static void cp_parser_namespace_alias_definition | |
1513 | PARAMS ((cp_parser *)); | |
1514 | static void cp_parser_using_declaration | |
1515 | PARAMS ((cp_parser *)); | |
1516 | static void cp_parser_using_directive | |
1517 | PARAMS ((cp_parser *)); | |
1518 | static void cp_parser_asm_definition | |
1519 | PARAMS ((cp_parser *)); | |
1520 | static void cp_parser_linkage_specification | |
1521 | PARAMS ((cp_parser *)); | |
1522 | ||
1523 | /* Declarators [gram.dcl.decl] */ | |
1524 | ||
1525 | static tree cp_parser_init_declarator | |
1526 | PARAMS ((cp_parser *, tree, tree, tree, bool, bool, bool *)); | |
1527 | static tree cp_parser_declarator | |
1528 | PARAMS ((cp_parser *, bool, bool *)); | |
1529 | static tree cp_parser_direct_declarator | |
1530 | PARAMS ((cp_parser *, bool, bool *)); | |
1531 | static enum tree_code cp_parser_ptr_operator | |
1532 | PARAMS ((cp_parser *, tree *, tree *)); | |
1533 | static tree cp_parser_cv_qualifier_seq_opt | |
1534 | PARAMS ((cp_parser *)); | |
1535 | static tree cp_parser_cv_qualifier_opt | |
1536 | PARAMS ((cp_parser *)); | |
1537 | static tree cp_parser_declarator_id | |
1538 | PARAMS ((cp_parser *)); | |
1539 | static tree cp_parser_type_id | |
1540 | PARAMS ((cp_parser *)); | |
1541 | static tree cp_parser_type_specifier_seq | |
1542 | PARAMS ((cp_parser *)); | |
1543 | static tree cp_parser_parameter_declaration_clause | |
1544 | PARAMS ((cp_parser *)); | |
1545 | static tree cp_parser_parameter_declaration_list | |
1546 | PARAMS ((cp_parser *)); | |
1547 | static tree cp_parser_parameter_declaration | |
1548 | PARAMS ((cp_parser *, bool)); | |
1549 | static tree cp_parser_function_definition | |
1550 | PARAMS ((cp_parser *, bool *)); | |
1551 | static void cp_parser_function_body | |
1552 | (cp_parser *); | |
1553 | static tree cp_parser_initializer | |
1554 | PARAMS ((cp_parser *, bool *)); | |
1555 | static tree cp_parser_initializer_clause | |
1556 | PARAMS ((cp_parser *)); | |
1557 | static tree cp_parser_initializer_list | |
1558 | PARAMS ((cp_parser *)); | |
1559 | ||
1560 | static bool cp_parser_ctor_initializer_opt_and_function_body | |
1561 | (cp_parser *); | |
1562 | ||
1563 | /* Classes [gram.class] */ | |
1564 | ||
1565 | static tree cp_parser_class_name | |
1566 | (cp_parser *, bool, bool, bool, bool, bool, bool); | |
1567 | static tree cp_parser_class_specifier | |
1568 | PARAMS ((cp_parser *)); | |
1569 | static tree cp_parser_class_head | |
1570 | PARAMS ((cp_parser *, bool *, bool *, tree *)); | |
1571 | static enum tag_types cp_parser_class_key | |
1572 | PARAMS ((cp_parser *)); | |
1573 | static void cp_parser_member_specification_opt | |
1574 | PARAMS ((cp_parser *)); | |
1575 | static void cp_parser_member_declaration | |
1576 | PARAMS ((cp_parser *)); | |
1577 | static tree cp_parser_pure_specifier | |
1578 | PARAMS ((cp_parser *)); | |
1579 | static tree cp_parser_constant_initializer | |
1580 | PARAMS ((cp_parser *)); | |
1581 | ||
1582 | /* Derived classes [gram.class.derived] */ | |
1583 | ||
1584 | static tree cp_parser_base_clause | |
1585 | PARAMS ((cp_parser *)); | |
1586 | static tree cp_parser_base_specifier | |
1587 | PARAMS ((cp_parser *)); | |
1588 | ||
1589 | /* Special member functions [gram.special] */ | |
1590 | ||
1591 | static tree cp_parser_conversion_function_id | |
1592 | PARAMS ((cp_parser *)); | |
1593 | static tree cp_parser_conversion_type_id | |
1594 | PARAMS ((cp_parser *)); | |
1595 | static tree cp_parser_conversion_declarator_opt | |
1596 | PARAMS ((cp_parser *)); | |
1597 | static bool cp_parser_ctor_initializer_opt | |
1598 | PARAMS ((cp_parser *)); | |
1599 | static void cp_parser_mem_initializer_list | |
1600 | PARAMS ((cp_parser *)); | |
1601 | static tree cp_parser_mem_initializer | |
1602 | PARAMS ((cp_parser *)); | |
1603 | static tree cp_parser_mem_initializer_id | |
1604 | PARAMS ((cp_parser *)); | |
1605 | ||
1606 | /* Overloading [gram.over] */ | |
1607 | ||
1608 | static tree cp_parser_operator_function_id | |
1609 | PARAMS ((cp_parser *)); | |
1610 | static tree cp_parser_operator | |
1611 | PARAMS ((cp_parser *)); | |
1612 | ||
1613 | /* Templates [gram.temp] */ | |
1614 | ||
1615 | static void cp_parser_template_declaration | |
1616 | PARAMS ((cp_parser *, bool)); | |
1617 | static tree cp_parser_template_parameter_list | |
1618 | PARAMS ((cp_parser *)); | |
1619 | static tree cp_parser_template_parameter | |
1620 | PARAMS ((cp_parser *)); | |
1621 | static tree cp_parser_type_parameter | |
1622 | PARAMS ((cp_parser *)); | |
1623 | static tree cp_parser_template_id | |
1624 | PARAMS ((cp_parser *, bool, bool)); | |
1625 | static tree cp_parser_template_name | |
1626 | PARAMS ((cp_parser *, bool, bool)); | |
1627 | static tree cp_parser_template_argument_list | |
1628 | PARAMS ((cp_parser *)); | |
1629 | static tree cp_parser_template_argument | |
1630 | PARAMS ((cp_parser *)); | |
1631 | static void cp_parser_explicit_instantiation | |
1632 | PARAMS ((cp_parser *)); | |
1633 | static void cp_parser_explicit_specialization | |
1634 | PARAMS ((cp_parser *)); | |
1635 | ||
1636 | /* Exception handling [gram.exception] */ | |
1637 | ||
1638 | static tree cp_parser_try_block | |
1639 | PARAMS ((cp_parser *)); | |
1640 | static bool cp_parser_function_try_block | |
1641 | PARAMS ((cp_parser *)); | |
1642 | static void cp_parser_handler_seq | |
1643 | PARAMS ((cp_parser *)); | |
1644 | static void cp_parser_handler | |
1645 | PARAMS ((cp_parser *)); | |
1646 | static tree cp_parser_exception_declaration | |
1647 | PARAMS ((cp_parser *)); | |
1648 | static tree cp_parser_throw_expression | |
1649 | PARAMS ((cp_parser *)); | |
1650 | static tree cp_parser_exception_specification_opt | |
1651 | PARAMS ((cp_parser *)); | |
1652 | static tree cp_parser_type_id_list | |
1653 | PARAMS ((cp_parser *)); | |
1654 | ||
1655 | /* GNU Extensions */ | |
1656 | ||
1657 | static tree cp_parser_asm_specification_opt | |
1658 | PARAMS ((cp_parser *)); | |
1659 | static tree cp_parser_asm_operand_list | |
1660 | PARAMS ((cp_parser *)); | |
1661 | static tree cp_parser_asm_clobber_list | |
1662 | PARAMS ((cp_parser *)); | |
1663 | static tree cp_parser_attributes_opt | |
1664 | PARAMS ((cp_parser *)); | |
1665 | static tree cp_parser_attribute_list | |
1666 | PARAMS ((cp_parser *)); | |
1667 | static bool cp_parser_extension_opt | |
1668 | PARAMS ((cp_parser *, int *)); | |
1669 | static void cp_parser_label_declaration | |
1670 | PARAMS ((cp_parser *)); | |
1671 | ||
1672 | /* Utility Routines */ | |
1673 | ||
1674 | static tree cp_parser_lookup_name | |
1675 | PARAMS ((cp_parser *, tree, bool, bool, bool)); | |
1676 | static tree cp_parser_lookup_name_simple | |
1677 | PARAMS ((cp_parser *, tree)); | |
1678 | static tree cp_parser_resolve_typename_type | |
1679 | PARAMS ((cp_parser *, tree)); | |
1680 | static tree cp_parser_maybe_treat_template_as_class | |
1681 | (tree, bool); | |
1682 | static bool cp_parser_check_declarator_template_parameters | |
1683 | PARAMS ((cp_parser *, tree)); | |
1684 | static bool cp_parser_check_template_parameters | |
1685 | PARAMS ((cp_parser *, unsigned)); | |
1686 | static tree cp_parser_binary_expression | |
1687 | PARAMS ((cp_parser *, | |
1688 | cp_parser_token_tree_map, | |
1689 | cp_parser_expression_fn)); | |
1690 | static tree cp_parser_global_scope_opt | |
1691 | PARAMS ((cp_parser *, bool)); | |
1692 | static bool cp_parser_constructor_declarator_p | |
1693 | (cp_parser *, bool); | |
1694 | static tree cp_parser_function_definition_from_specifiers_and_declarator | |
1695 | PARAMS ((cp_parser *, tree, tree, tree, tree)); | |
1696 | static tree cp_parser_function_definition_after_declarator | |
1697 | PARAMS ((cp_parser *, bool)); | |
1698 | static void cp_parser_template_declaration_after_export | |
1699 | PARAMS ((cp_parser *, bool)); | |
1700 | static tree cp_parser_single_declaration | |
1701 | PARAMS ((cp_parser *, bool, bool *)); | |
1702 | static tree cp_parser_functional_cast | |
1703 | PARAMS ((cp_parser *, tree)); | |
1704 | static void cp_parser_late_parsing_for_member | |
1705 | PARAMS ((cp_parser *, tree)); | |
1706 | static void cp_parser_late_parsing_default_args | |
1707 | PARAMS ((cp_parser *, tree)); | |
1708 | static tree cp_parser_sizeof_operand | |
1709 | PARAMS ((cp_parser *, enum rid)); | |
1710 | static bool cp_parser_declares_only_class_p | |
1711 | PARAMS ((cp_parser *)); | |
1712 | static bool cp_parser_friend_p | |
1713 | PARAMS ((tree)); | |
1714 | static cp_token *cp_parser_require | |
1715 | PARAMS ((cp_parser *, enum cpp_ttype, const char *)); | |
1716 | static cp_token *cp_parser_require_keyword | |
1717 | PARAMS ((cp_parser *, enum rid, const char *)); | |
1718 | static bool cp_parser_token_starts_function_definition_p | |
1719 | PARAMS ((cp_token *)); | |
1720 | static bool cp_parser_next_token_starts_class_definition_p | |
1721 | (cp_parser *); | |
1722 | static enum tag_types cp_parser_token_is_class_key | |
1723 | PARAMS ((cp_token *)); | |
1724 | static void cp_parser_check_class_key | |
1725 | (enum tag_types, tree type); | |
1726 | static bool cp_parser_optional_template_keyword | |
1727 | (cp_parser *); | |
1728 | static void cp_parser_cache_group | |
1729 | (cp_parser *, cp_token_cache *, enum cpp_ttype, unsigned); | |
1730 | static void cp_parser_parse_tentatively | |
1731 | PARAMS ((cp_parser *)); | |
1732 | static void cp_parser_commit_to_tentative_parse | |
1733 | PARAMS ((cp_parser *)); | |
1734 | static void cp_parser_abort_tentative_parse | |
1735 | PARAMS ((cp_parser *)); | |
1736 | static bool cp_parser_parse_definitely | |
1737 | PARAMS ((cp_parser *)); | |
1738 | static bool cp_parser_parsing_tentatively | |
1739 | PARAMS ((cp_parser *)); | |
1740 | static bool cp_parser_committed_to_tentative_parse | |
1741 | PARAMS ((cp_parser *)); | |
1742 | static void cp_parser_error | |
1743 | PARAMS ((cp_parser *, const char *)); | |
1744 | static void cp_parser_simulate_error | |
1745 | PARAMS ((cp_parser *)); | |
1746 | static void cp_parser_check_type_definition | |
1747 | PARAMS ((cp_parser *)); | |
1748 | static bool cp_parser_skip_to_closing_parenthesis | |
1749 | PARAMS ((cp_parser *)); | |
1750 | static bool cp_parser_skip_to_closing_parenthesis_or_comma | |
1751 | (cp_parser *); | |
1752 | static void cp_parser_skip_to_end_of_statement | |
1753 | PARAMS ((cp_parser *)); | |
1754 | static void cp_parser_skip_to_end_of_block_or_statement | |
1755 | PARAMS ((cp_parser *)); | |
1756 | static void cp_parser_skip_to_closing_brace | |
1757 | (cp_parser *); | |
1758 | static void cp_parser_skip_until_found | |
1759 | PARAMS ((cp_parser *, enum cpp_ttype, const char *)); | |
1760 | static bool cp_parser_error_occurred | |
1761 | PARAMS ((cp_parser *)); | |
1762 | static bool cp_parser_allow_gnu_extensions_p | |
1763 | PARAMS ((cp_parser *)); | |
1764 | static bool cp_parser_is_string_literal | |
1765 | PARAMS ((cp_token *)); | |
1766 | static bool cp_parser_is_keyword | |
1767 | PARAMS ((cp_token *, enum rid)); | |
1768 | static bool cp_parser_dependent_type_p | |
1769 | (tree); | |
1770 | static bool cp_parser_value_dependent_expression_p | |
1771 | (tree); | |
1772 | static bool cp_parser_type_dependent_expression_p | |
1773 | (tree); | |
1774 | static bool cp_parser_dependent_template_arg_p | |
1775 | (tree); | |
1776 | static bool cp_parser_dependent_template_id_p | |
1777 | (tree, tree); | |
1778 | static bool cp_parser_dependent_template_p | |
1779 | (tree); | |
1780 | static void cp_parser_defer_access_check | |
1781 | (cp_parser *, tree, tree); | |
1782 | static void cp_parser_start_deferring_access_checks | |
1783 | (cp_parser *); | |
1784 | static tree cp_parser_stop_deferring_access_checks | |
1785 | PARAMS ((cp_parser *)); | |
1786 | static void cp_parser_perform_deferred_access_checks | |
1787 | PARAMS ((tree)); | |
1788 | static tree cp_parser_scope_through_which_access_occurs | |
1789 | (tree, tree, tree); | |
1790 | ||
1791 | /* Returns non-zero if TOKEN is a string literal. */ | |
1792 | ||
1793 | static bool | |
1794 | cp_parser_is_string_literal (token) | |
1795 | cp_token *token; | |
1796 | { | |
1797 | return (token->type == CPP_STRING || token->type == CPP_WSTRING); | |
1798 | } | |
1799 | ||
1800 | /* Returns non-zero if TOKEN is the indicated KEYWORD. */ | |
1801 | ||
1802 | static bool | |
1803 | cp_parser_is_keyword (token, keyword) | |
1804 | cp_token *token; | |
1805 | enum rid keyword; | |
1806 | { | |
1807 | return token->keyword == keyword; | |
1808 | } | |
1809 | ||
1810 | /* Returns TRUE if TYPE is dependent, in the sense of | |
1811 | [temp.dep.type]. */ | |
1812 | ||
1813 | static bool | |
1814 | cp_parser_dependent_type_p (type) | |
1815 | tree type; | |
1816 | { | |
1817 | tree scope; | |
1818 | ||
1819 | if (!processing_template_decl) | |
1820 | return false; | |
1821 | ||
1822 | /* If the type is NULL, we have not computed a type for the entity | |
1823 | in question; in that case, the type is dependent. */ | |
1824 | if (!type) | |
1825 | return true; | |
1826 | ||
1827 | /* Erroneous types can be considered non-dependent. */ | |
1828 | if (type == error_mark_node) | |
1829 | return false; | |
1830 | ||
1831 | /* [temp.dep.type] | |
1832 | ||
1833 | A type is dependent if it is: | |
1834 | ||
1835 | -- a template parameter. */ | |
1836 | if (TREE_CODE (type) == TEMPLATE_TYPE_PARM) | |
1837 | return true; | |
1838 | /* -- a qualified-id with a nested-name-specifier which contains a | |
1839 | class-name that names a dependent type or whose unqualified-id | |
1840 | names a dependent type. */ | |
1841 | if (TREE_CODE (type) == TYPENAME_TYPE) | |
1842 | return true; | |
1843 | /* -- a cv-qualified type where the cv-unqualified type is | |
1844 | dependent. */ | |
1845 | type = TYPE_MAIN_VARIANT (type); | |
1846 | /* -- a compound type constructed from any dependent type. */ | |
1847 | if (TYPE_PTRMEM_P (type) || TYPE_PTRMEMFUNC_P (type)) | |
1848 | return (cp_parser_dependent_type_p (TYPE_PTRMEM_CLASS_TYPE (type)) | |
1849 | || cp_parser_dependent_type_p (TYPE_PTRMEM_POINTED_TO_TYPE | |
1850 | (type))); | |
1851 | else if (TREE_CODE (type) == POINTER_TYPE | |
1852 | || TREE_CODE (type) == REFERENCE_TYPE) | |
1853 | return cp_parser_dependent_type_p (TREE_TYPE (type)); | |
1854 | else if (TREE_CODE (type) == FUNCTION_TYPE | |
1855 | || TREE_CODE (type) == METHOD_TYPE) | |
1856 | { | |
1857 | tree arg_type; | |
1858 | ||
1859 | if (cp_parser_dependent_type_p (TREE_TYPE (type))) | |
1860 | return true; | |
1861 | for (arg_type = TYPE_ARG_TYPES (type); | |
1862 | arg_type; | |
1863 | arg_type = TREE_CHAIN (arg_type)) | |
1864 | if (cp_parser_dependent_type_p (TREE_VALUE (arg_type))) | |
1865 | return true; | |
1866 | return false; | |
1867 | } | |
1868 | /* -- an array type constructed from any dependent type or whose | |
1869 | size is specified by a constant expression that is | |
1870 | value-dependent. */ | |
1871 | if (TREE_CODE (type) == ARRAY_TYPE) | |
1872 | { | |
1873 | if (TYPE_DOMAIN (TREE_TYPE (type)) | |
1874 | && ((cp_parser_value_dependent_expression_p | |
1875 | (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))) | |
1876 | || (cp_parser_type_dependent_expression_p | |
1877 | (TYPE_MAX_VALUE (TYPE_DOMAIN (type)))))) | |
1878 | return true; | |
1879 | return cp_parser_dependent_type_p (TREE_TYPE (type)); | |
1880 | } | |
1881 | /* -- a template-id in which either the template name is a template | |
1882 | parameter or any of the template arguments is a dependent type or | |
1883 | an expression that is type-dependent or value-dependent. | |
1884 | ||
1885 | This language seems somewhat confused; for example, it does not | |
1886 | discuss template template arguments. Therefore, we use the | |
1887 | definition for dependent template arguments in [temp.dep.temp]. */ | |
1888 | if (CLASS_TYPE_P (type) && CLASSTYPE_TEMPLATE_INFO (type) | |
1889 | && (cp_parser_dependent_template_id_p | |
1890 | (CLASSTYPE_TI_TEMPLATE (type), | |
1891 | CLASSTYPE_TI_ARGS (type)))) | |
1892 | return true; | |
1893 | else if (TREE_CODE (type) == BOUND_TEMPLATE_TEMPLATE_PARM) | |
1894 | return true; | |
1895 | /* All TYPEOF_TYPEs are dependent; if the argument of the `typeof' | |
1896 | expression is not type-dependent, then it should already been | |
1897 | have resolved. */ | |
1898 | if (TREE_CODE (type) == TYPEOF_TYPE) | |
1899 | return true; | |
1900 | /* The standard does not specifically mention types that are local | |
1901 | to template functions or local classes, but they should be | |
1902 | considered dependent too. For example: | |
1903 | ||
1904 | template <int I> void f() { | |
1905 | enum E { a = I }; | |
1906 | S<sizeof (E)> s; | |
1907 | } | |
1908 | ||
1909 | The size of `E' cannot be known until the value of `I' has been | |
1910 | determined. Therefore, `E' must be considered dependent. */ | |
1911 | scope = TYPE_CONTEXT (type); | |
1912 | if (scope && TYPE_P (scope)) | |
1913 | return cp_parser_dependent_type_p (scope); | |
1914 | else if (scope && TREE_CODE (scope) == FUNCTION_DECL) | |
1915 | return cp_parser_type_dependent_expression_p (scope); | |
1916 | ||
1917 | /* Other types are non-dependent. */ | |
1918 | return false; | |
1919 | } | |
1920 | ||
1921 | /* Returns TRUE if the EXPRESSION is value-dependent. */ | |
1922 | ||
1923 | static bool | |
1924 | cp_parser_value_dependent_expression_p (tree expression) | |
1925 | { | |
1926 | if (!processing_template_decl) | |
1927 | return false; | |
1928 | ||
1929 | /* A name declared with a dependent type. */ | |
1930 | if (DECL_P (expression) | |
1931 | && cp_parser_dependent_type_p (TREE_TYPE (expression))) | |
1932 | return true; | |
1933 | /* A non-type template parameter. */ | |
1934 | if ((TREE_CODE (expression) == CONST_DECL | |
1935 | && DECL_TEMPLATE_PARM_P (expression)) | |
1936 | || TREE_CODE (expression) == TEMPLATE_PARM_INDEX) | |
1937 | return true; | |
1938 | /* A constant with integral or enumeration type and is initialized | |
1939 | with an expression that is value-dependent. */ | |
1940 | if (TREE_CODE (expression) == VAR_DECL | |
1941 | && DECL_INITIAL (expression) | |
1942 | && (CP_INTEGRAL_TYPE_P (TREE_TYPE (expression)) | |
1943 | || TREE_CODE (TREE_TYPE (expression)) == ENUMERAL_TYPE) | |
1944 | && cp_parser_value_dependent_expression_p (DECL_INITIAL (expression))) | |
1945 | return true; | |
1946 | /* These expressions are value-dependent if the type to which the | |
1947 | cast occurs is dependent. */ | |
1948 | if ((TREE_CODE (expression) == DYNAMIC_CAST_EXPR | |
1949 | || TREE_CODE (expression) == STATIC_CAST_EXPR | |
1950 | || TREE_CODE (expression) == CONST_CAST_EXPR | |
1951 | || TREE_CODE (expression) == REINTERPRET_CAST_EXPR | |
1952 | || TREE_CODE (expression) == CAST_EXPR) | |
1953 | && cp_parser_dependent_type_p (TREE_TYPE (expression))) | |
1954 | return true; | |
1955 | /* A `sizeof' expression where the sizeof operand is a type is | |
1956 | value-dependent if the type is dependent. If the type was not | |
1957 | dependent, we would no longer have a SIZEOF_EXPR, so any | |
1958 | SIZEOF_EXPR is dependent. */ | |
1959 | if (TREE_CODE (expression) == SIZEOF_EXPR) | |
1960 | return true; | |
1961 | /* A constant expression is value-dependent if any subexpression is | |
1962 | value-dependent. */ | |
1963 | if (IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (TREE_CODE (expression)))) | |
1964 | { | |
1965 | switch (TREE_CODE_CLASS (TREE_CODE (expression))) | |
1966 | { | |
1967 | case '1': | |
1968 | return (cp_parser_value_dependent_expression_p | |
1969 | (TREE_OPERAND (expression, 0))); | |
1970 | case '<': | |
1971 | case '2': | |
1972 | return ((cp_parser_value_dependent_expression_p | |
1973 | (TREE_OPERAND (expression, 0))) | |
1974 | || (cp_parser_value_dependent_expression_p | |
1975 | (TREE_OPERAND (expression, 1)))); | |
1976 | case 'e': | |
1977 | { | |
1978 | int i; | |
1979 | for (i = 0; | |
1980 | i < TREE_CODE_LENGTH (TREE_CODE (expression)); | |
1981 | ++i) | |
1982 | if (cp_parser_value_dependent_expression_p | |
1983 | (TREE_OPERAND (expression, i))) | |
1984 | return true; | |
1985 | return false; | |
1986 | } | |
1987 | } | |
1988 | } | |
1989 | ||
1990 | /* The expression is not value-dependent. */ | |
1991 | return false; | |
1992 | } | |
1993 | ||
1994 | /* Returns TRUE if the EXPRESSION is type-dependent, in the sense of | |
1995 | [temp.dep.expr]. */ | |
1996 | ||
1997 | static bool | |
1998 | cp_parser_type_dependent_expression_p (expression) | |
1999 | tree expression; | |
2000 | { | |
2001 | if (!processing_template_decl) | |
2002 | return false; | |
2003 | ||
2004 | /* Some expression forms are never type-dependent. */ | |
2005 | if (TREE_CODE (expression) == PSEUDO_DTOR_EXPR | |
2006 | || TREE_CODE (expression) == SIZEOF_EXPR | |
2007 | || TREE_CODE (expression) == ALIGNOF_EXPR | |
2008 | || TREE_CODE (expression) == TYPEID_EXPR | |
2009 | || TREE_CODE (expression) == DELETE_EXPR | |
2010 | || TREE_CODE (expression) == VEC_DELETE_EXPR | |
2011 | || TREE_CODE (expression) == THROW_EXPR) | |
2012 | return false; | |
2013 | ||
2014 | /* The types of these expressions depends only on the type to which | |
2015 | the cast occurs. */ | |
2016 | if (TREE_CODE (expression) == DYNAMIC_CAST_EXPR | |
2017 | || TREE_CODE (expression) == STATIC_CAST_EXPR | |
2018 | || TREE_CODE (expression) == CONST_CAST_EXPR | |
2019 | || TREE_CODE (expression) == REINTERPRET_CAST_EXPR | |
2020 | || TREE_CODE (expression) == CAST_EXPR) | |
2021 | return cp_parser_dependent_type_p (TREE_TYPE (expression)); | |
2022 | /* The types of these expressions depends only on the type created | |
2023 | by the expression. */ | |
2024 | else if (TREE_CODE (expression) == NEW_EXPR | |
2025 | || TREE_CODE (expression) == VEC_NEW_EXPR) | |
2026 | return cp_parser_dependent_type_p (TREE_OPERAND (expression, 1)); | |
2027 | ||
2028 | if (TREE_CODE (expression) == FUNCTION_DECL | |
2029 | && DECL_LANG_SPECIFIC (expression) | |
2030 | && DECL_TEMPLATE_INFO (expression) | |
2031 | && (cp_parser_dependent_template_id_p | |
2032 | (DECL_TI_TEMPLATE (expression), | |
2033 | INNERMOST_TEMPLATE_ARGS (DECL_TI_ARGS (expression))))) | |
2034 | return true; | |
2035 | ||
2036 | return (cp_parser_dependent_type_p (TREE_TYPE (expression))); | |
2037 | } | |
2038 | ||
2039 | /* Returns TRUE if the ARG (a template argument) is dependent. */ | |
2040 | ||
2041 | static bool | |
2042 | cp_parser_dependent_template_arg_p (tree arg) | |
2043 | { | |
2044 | if (!processing_template_decl) | |
2045 | return false; | |
2046 | ||
2047 | if (TREE_CODE (arg) == TEMPLATE_DECL | |
2048 | || TREE_CODE (arg) == TEMPLATE_TEMPLATE_PARM) | |
2049 | return cp_parser_dependent_template_p (arg); | |
2050 | else if (TYPE_P (arg)) | |
2051 | return cp_parser_dependent_type_p (arg); | |
2052 | else | |
2053 | return (cp_parser_type_dependent_expression_p (arg) | |
2054 | || cp_parser_value_dependent_expression_p (arg)); | |
2055 | } | |
2056 | ||
2057 | /* Returns TRUE if the specialization TMPL<ARGS> is dependent. */ | |
2058 | ||
2059 | static bool | |
2060 | cp_parser_dependent_template_id_p (tree tmpl, tree args) | |
2061 | { | |
2062 | int i; | |
2063 | ||
2064 | if (cp_parser_dependent_template_p (tmpl)) | |
2065 | return true; | |
2066 | for (i = 0; i < TREE_VEC_LENGTH (args); ++i) | |
2067 | if (cp_parser_dependent_template_arg_p (TREE_VEC_ELT (args, i))) | |
2068 | return true; | |
2069 | return false; | |
2070 | } | |
2071 | ||
2072 | /* Returns TRUE if the template TMPL is dependent. */ | |
2073 | ||
2074 | static bool | |
2075 | cp_parser_dependent_template_p (tree tmpl) | |
2076 | { | |
2077 | /* Template template parameters are dependent. */ | |
2078 | if (DECL_TEMPLATE_TEMPLATE_PARM_P (tmpl) | |
2079 | || TREE_CODE (tmpl) == TEMPLATE_TEMPLATE_PARM) | |
2080 | return true; | |
2081 | /* So are member templates of dependent classes. */ | |
2082 | if (TYPE_P (CP_DECL_CONTEXT (tmpl))) | |
2083 | return cp_parser_dependent_type_p (DECL_CONTEXT (tmpl)); | |
2084 | return false; | |
2085 | } | |
2086 | ||
2087 | /* Defer checking the accessibility of DECL, when looked up in | |
2088 | CLASS_TYPE. */ | |
2089 | ||
2090 | static void | |
2091 | cp_parser_defer_access_check (cp_parser *parser, | |
2092 | tree class_type, | |
2093 | tree decl) | |
2094 | { | |
2095 | tree check; | |
2096 | ||
2097 | /* If we are not supposed to defer access checks, just check now. */ | |
2098 | if (!parser->context->deferring_access_checks_p) | |
2099 | { | |
2100 | enforce_access (class_type, decl); | |
2101 | return; | |
2102 | } | |
2103 | ||
2104 | /* See if we are already going to perform this check. */ | |
2105 | for (check = parser->context->deferred_access_checks; | |
2106 | check; | |
2107 | check = TREE_CHAIN (check)) | |
2108 | if (TREE_VALUE (check) == decl | |
2109 | && same_type_p (TREE_PURPOSE (check), class_type)) | |
2110 | return; | |
2111 | /* If not, record the check. */ | |
2112 | parser->context->deferred_access_checks | |
2113 | = tree_cons (class_type, decl, parser->context->deferred_access_checks); | |
2114 | } | |
2115 | ||
2116 | /* Start deferring access control checks. */ | |
2117 | ||
2118 | static void | |
2119 | cp_parser_start_deferring_access_checks (cp_parser *parser) | |
2120 | { | |
2121 | parser->context->deferring_access_checks_p = true; | |
2122 | } | |
2123 | ||
2124 | /* Stop deferring access control checks. Returns a TREE_LIST | |
2125 | representing the deferred checks. The TREE_PURPOSE of each node is | |
2126 | the type through which the access occurred; the TREE_VALUE is the | |
2127 | declaration named. */ | |
2128 | ||
2129 | static tree | |
2130 | cp_parser_stop_deferring_access_checks (parser) | |
2131 | cp_parser *parser; | |
2132 | { | |
2133 | tree access_checks; | |
2134 | ||
2135 | parser->context->deferring_access_checks_p = false; | |
2136 | access_checks = parser->context->deferred_access_checks; | |
2137 | parser->context->deferred_access_checks = NULL_TREE; | |
2138 | ||
2139 | return access_checks; | |
2140 | } | |
2141 | ||
2142 | /* Perform the deferred ACCESS_CHECKS, whose representation is as | |
2143 | documented with cp_parser_stop_deferrring_access_checks. */ | |
2144 | ||
2145 | static void | |
2146 | cp_parser_perform_deferred_access_checks (access_checks) | |
2147 | tree access_checks; | |
2148 | { | |
2149 | tree deferred_check; | |
2150 | ||
2151 | /* Look through all the deferred checks. */ | |
2152 | for (deferred_check = access_checks; | |
2153 | deferred_check; | |
2154 | deferred_check = TREE_CHAIN (deferred_check)) | |
2155 | /* Check access. */ | |
2156 | enforce_access (TREE_PURPOSE (deferred_check), | |
2157 | TREE_VALUE (deferred_check)); | |
2158 | } | |
2159 | ||
2160 | /* Returns the scope through which DECL is being accessed, or | |
2161 | NULL_TREE if DECL is not a member. If OBJECT_TYPE is non-NULL, we | |
2162 | have just seen `x->' or `x.' and OBJECT_TYPE is the type of `*x', | |
2163 | or `x', respectively. If the DECL was named as `A::B' then | |
2164 | NESTED_NAME_SPECIFIER is `A'. */ | |
2165 | ||
2166 | tree | |
2167 | cp_parser_scope_through_which_access_occurs (decl, | |
2168 | object_type, | |
2169 | nested_name_specifier) | |
2170 | tree decl; | |
2171 | tree object_type; | |
2172 | tree nested_name_specifier; | |
2173 | { | |
2174 | tree scope; | |
2175 | tree qualifying_type = NULL_TREE; | |
2176 | ||
2177 | /* Determine the SCOPE of DECL. */ | |
2178 | scope = context_for_name_lookup (decl); | |
2179 | /* If the SCOPE is not a type, then DECL is not a member. */ | |
2180 | if (!TYPE_P (scope)) | |
2181 | return NULL_TREE; | |
2182 | /* Figure out the type through which DECL is being accessed. */ | |
2183 | if (object_type && DERIVED_FROM_P (scope, object_type)) | |
2184 | /* If we are processing a `->' or `.' expression, use the type of the | |
2185 | left-hand side. */ | |
2186 | qualifying_type = object_type; | |
2187 | else if (nested_name_specifier) | |
2188 | { | |
2189 | /* If the reference is to a non-static member of the | |
2190 | current class, treat it as if it were referenced through | |
2191 | `this'. */ | |
2192 | if (DECL_NONSTATIC_MEMBER_P (decl) | |
2193 | && current_class_ptr | |
2194 | && DERIVED_FROM_P (scope, current_class_type)) | |
2195 | qualifying_type = current_class_type; | |
2196 | /* Otherwise, use the type indicated by the | |
2197 | nested-name-specifier. */ | |
2198 | else | |
2199 | qualifying_type = nested_name_specifier; | |
2200 | } | |
2201 | else | |
2202 | /* Otherwise, the name must be from the current class or one of | |
2203 | its bases. */ | |
2204 | qualifying_type = currently_open_derived_class (scope); | |
2205 | ||
2206 | return qualifying_type; | |
2207 | } | |
2208 | ||
2209 | /* Issue the indicated error MESSAGE. */ | |
2210 | ||
2211 | static void | |
2212 | cp_parser_error (parser, message) | |
2213 | cp_parser *parser; | |
2214 | const char *message; | |
2215 | { | |
2216 | /* Remember that we have issued an error. */ | |
2217 | cp_parser_simulate_error (parser); | |
2218 | /* Output the MESSAGE -- unless we're parsing tentatively. */ | |
2219 | if (!cp_parser_parsing_tentatively (parser) | |
2220 | || cp_parser_committed_to_tentative_parse (parser)) | |
2221 | error (message); | |
2222 | } | |
2223 | ||
2224 | /* If we are parsing tentatively, remember that an error has occurred | |
2225 | during this tentative parse. */ | |
2226 | ||
2227 | static void | |
2228 | cp_parser_simulate_error (parser) | |
2229 | cp_parser *parser; | |
2230 | { | |
2231 | if (cp_parser_parsing_tentatively (parser) | |
2232 | && !cp_parser_committed_to_tentative_parse (parser)) | |
2233 | parser->context->status = CP_PARSER_STATUS_KIND_ERROR; | |
2234 | } | |
2235 | ||
2236 | /* This function is called when a type is defined. If type | |
2237 | definitions are forbidden at this point, an error message is | |
2238 | issued. */ | |
2239 | ||
2240 | static void | |
2241 | cp_parser_check_type_definition (parser) | |
2242 | cp_parser *parser; | |
2243 | { | |
2244 | /* If types are forbidden here, issue a message. */ | |
2245 | if (parser->type_definition_forbidden_message) | |
2246 | /* Use `%s' to print the string in case there are any escape | |
2247 | characters in the message. */ | |
2248 | error ("%s", parser->type_definition_forbidden_message); | |
2249 | } | |
2250 | ||
2251 | /* Consume tokens up to, and including, the next non-nested closing `)'. | |
2252 | Returns TRUE iff we found a closing `)'. */ | |
2253 | ||
2254 | static bool | |
2255 | cp_parser_skip_to_closing_parenthesis (cp_parser *parser) | |
2256 | { | |
2257 | unsigned nesting_depth = 0; | |
2258 | ||
2259 | while (true) | |
2260 | { | |
2261 | cp_token *token; | |
2262 | ||
2263 | /* If we've run out of tokens, then there is no closing `)'. */ | |
2264 | if (cp_lexer_next_token_is (parser->lexer, CPP_EOF)) | |
2265 | return false; | |
2266 | /* Consume the token. */ | |
2267 | token = cp_lexer_consume_token (parser->lexer); | |
2268 | /* If it is an `(', we have entered another level of nesting. */ | |
2269 | if (token->type == CPP_OPEN_PAREN) | |
2270 | ++nesting_depth; | |
2271 | /* If it is a `)', then we might be done. */ | |
2272 | else if (token->type == CPP_CLOSE_PAREN && nesting_depth-- == 0) | |
2273 | return true; | |
2274 | } | |
2275 | } | |
2276 | ||
2277 | /* Consume tokens until the next token is a `)', or a `,'. Returns | |
2278 | TRUE if the next token is a `,'. */ | |
2279 | ||
2280 | static bool | |
2281 | cp_parser_skip_to_closing_parenthesis_or_comma (cp_parser *parser) | |
2282 | { | |
2283 | unsigned nesting_depth = 0; | |
2284 | ||
2285 | while (true) | |
2286 | { | |
2287 | cp_token *token = cp_lexer_peek_token (parser->lexer); | |
2288 | ||
2289 | /* If we've run out of tokens, then there is no closing `)'. */ | |
2290 | if (token->type == CPP_EOF) | |
2291 | return false; | |
2292 | /* If it is a `,' stop. */ | |
2293 | else if (token->type == CPP_COMMA && nesting_depth-- == 0) | |
2294 | return true; | |
2295 | /* If it is a `)', stop. */ | |
2296 | else if (token->type == CPP_CLOSE_PAREN && nesting_depth-- == 0) | |
2297 | return false; | |
2298 | /* If it is an `(', we have entered another level of nesting. */ | |
2299 | else if (token->type == CPP_OPEN_PAREN) | |
2300 | ++nesting_depth; | |
2301 | /* Consume the token. */ | |
2302 | token = cp_lexer_consume_token (parser->lexer); | |
2303 | } | |
2304 | } | |
2305 | ||
2306 | /* Consume tokens until we reach the end of the current statement. | |
2307 | Normally, that will be just before consuming a `;'. However, if a | |
2308 | non-nested `}' comes first, then we stop before consuming that. */ | |
2309 | ||
2310 | static void | |
2311 | cp_parser_skip_to_end_of_statement (parser) | |
2312 | cp_parser *parser; | |
2313 | { | |
2314 | unsigned nesting_depth = 0; | |
2315 | ||
2316 | while (true) | |
2317 | { | |
2318 | cp_token *token; | |
2319 | ||
2320 | /* Peek at the next token. */ | |
2321 | token = cp_lexer_peek_token (parser->lexer); | |
2322 | /* If we've run out of tokens, stop. */ | |
2323 | if (token->type == CPP_EOF) | |
2324 | break; | |
2325 | /* If the next token is a `;', we have reached the end of the | |
2326 | statement. */ | |
2327 | if (token->type == CPP_SEMICOLON && !nesting_depth) | |
2328 | break; | |
2329 | /* If the next token is a non-nested `}', then we have reached | |
2330 | the end of the current block. */ | |
2331 | if (token->type == CPP_CLOSE_BRACE) | |
2332 | { | |
2333 | /* If this is a non-nested `}', stop before consuming it. | |
2334 | That way, when confronted with something like: | |
2335 | ||
2336 | { 3 + } | |
2337 | ||
2338 | we stop before consuming the closing `}', even though we | |
2339 | have not yet reached a `;'. */ | |
2340 | if (nesting_depth == 0) | |
2341 | break; | |
2342 | /* If it is the closing `}' for a block that we have | |
2343 | scanned, stop -- but only after consuming the token. | |
2344 | That way given: | |
2345 | ||
2346 | void f g () { ... } | |
2347 | typedef int I; | |
2348 | ||
2349 | we will stop after the body of the erroneously declared | |
2350 | function, but before consuming the following `typedef' | |
2351 | declaration. */ | |
2352 | if (--nesting_depth == 0) | |
2353 | { | |
2354 | cp_lexer_consume_token (parser->lexer); | |
2355 | break; | |
2356 | } | |
2357 | } | |
2358 | /* If it the next token is a `{', then we are entering a new | |
2359 | block. Consume the entire block. */ | |
2360 | else if (token->type == CPP_OPEN_BRACE) | |
2361 | ++nesting_depth; | |
2362 | /* Consume the token. */ | |
2363 | cp_lexer_consume_token (parser->lexer); | |
2364 | } | |
2365 | } | |
2366 | ||
2367 | /* Skip tokens until we have consumed an entire block, or until we | |
2368 | have consumed a non-nested `;'. */ | |
2369 | ||
2370 | static void | |
2371 | cp_parser_skip_to_end_of_block_or_statement (parser) | |
2372 | cp_parser *parser; | |
2373 | { | |
2374 | unsigned nesting_depth = 0; | |
2375 | ||
2376 | while (true) | |
2377 | { | |
2378 | cp_token *token; | |
2379 | ||
2380 | /* Peek at the next token. */ | |
2381 | token = cp_lexer_peek_token (parser->lexer); | |
2382 | /* If we've run out of tokens, stop. */ | |
2383 | if (token->type == CPP_EOF) | |
2384 | break; | |
2385 | /* If the next token is a `;', we have reached the end of the | |
2386 | statement. */ | |
2387 | if (token->type == CPP_SEMICOLON && !nesting_depth) | |
2388 | { | |
2389 | /* Consume the `;'. */ | |
2390 | cp_lexer_consume_token (parser->lexer); | |
2391 | break; | |
2392 | } | |
2393 | /* Consume the token. */ | |
2394 | token = cp_lexer_consume_token (parser->lexer); | |
2395 | /* If the next token is a non-nested `}', then we have reached | |
2396 | the end of the current block. */ | |
2397 | if (token->type == CPP_CLOSE_BRACE | |
2398 | && (nesting_depth == 0 || --nesting_depth == 0)) | |
2399 | break; | |
2400 | /* If it the next token is a `{', then we are entering a new | |
2401 | block. Consume the entire block. */ | |
2402 | if (token->type == CPP_OPEN_BRACE) | |
2403 | ++nesting_depth; | |
2404 | } | |
2405 | } | |
2406 | ||
2407 | /* Skip tokens until a non-nested closing curly brace is the next | |
2408 | token. */ | |
2409 | ||
2410 | static void | |
2411 | cp_parser_skip_to_closing_brace (cp_parser *parser) | |
2412 | { | |
2413 | unsigned nesting_depth = 0; | |
2414 | ||
2415 | while (true) | |
2416 | { | |
2417 | cp_token *token; | |
2418 | ||
2419 | /* Peek at the next token. */ | |
2420 | token = cp_lexer_peek_token (parser->lexer); | |
2421 | /* If we've run out of tokens, stop. */ | |
2422 | if (token->type == CPP_EOF) | |
2423 | break; | |
2424 | /* If the next token is a non-nested `}', then we have reached | |
2425 | the end of the current block. */ | |
2426 | if (token->type == CPP_CLOSE_BRACE && nesting_depth-- == 0) | |
2427 | break; | |
2428 | /* If it the next token is a `{', then we are entering a new | |
2429 | block. Consume the entire block. */ | |
2430 | else if (token->type == CPP_OPEN_BRACE) | |
2431 | ++nesting_depth; | |
2432 | /* Consume the token. */ | |
2433 | cp_lexer_consume_token (parser->lexer); | |
2434 | } | |
2435 | } | |
2436 | ||
2437 | /* Create a new C++ parser. */ | |
2438 | ||
2439 | static cp_parser * | |
2440 | cp_parser_new () | |
2441 | { | |
2442 | cp_parser *parser; | |
2443 | ||
2444 | parser = (cp_parser *) ggc_alloc_cleared (sizeof (cp_parser)); | |
2445 | parser->lexer = cp_lexer_new (/*main_lexer_p=*/true); | |
2446 | parser->context = cp_parser_context_new (NULL); | |
2447 | ||
2448 | /* For now, we always accept GNU extensions. */ | |
2449 | parser->allow_gnu_extensions_p = 1; | |
2450 | ||
2451 | /* The `>' token is a greater-than operator, not the end of a | |
2452 | template-id. */ | |
2453 | parser->greater_than_is_operator_p = true; | |
2454 | ||
2455 | parser->default_arg_ok_p = true; | |
2456 | ||
2457 | /* We are not parsing a constant-expression. */ | |
2458 | parser->constant_expression_p = false; | |
2459 | ||
2460 | /* Local variable names are not forbidden. */ | |
2461 | parser->local_variables_forbidden_p = false; | |
2462 | ||
2463 | /* We are not procesing an `extern "C"' declaration. */ | |
2464 | parser->in_unbraced_linkage_specification_p = false; | |
2465 | ||
2466 | /* We are not processing a declarator. */ | |
2467 | parser->in_declarator_p = false; | |
2468 | ||
2469 | /* There are no default args to process. */ | |
2470 | parser->default_arg_types = NULL; | |
2471 | ||
2472 | /* The unparsed function queue is empty. */ | |
2473 | parser->unparsed_functions_queues = build_tree_list (NULL_TREE, NULL_TREE); | |
2474 | ||
2475 | /* There are no classes being defined. */ | |
2476 | parser->num_classes_being_defined = 0; | |
2477 | ||
2478 | /* No template parameters apply. */ | |
2479 | parser->num_template_parameter_lists = 0; | |
2480 | ||
2481 | return parser; | |
2482 | } | |
2483 | ||
2484 | /* Lexical conventions [gram.lex] */ | |
2485 | ||
2486 | /* Parse an identifier. Returns an IDENTIFIER_NODE representing the | |
2487 | identifier. */ | |
2488 | ||
2489 | static tree | |
2490 | cp_parser_identifier (parser) | |
2491 | cp_parser *parser; | |
2492 | { | |
2493 | cp_token *token; | |
2494 | ||
2495 | /* Look for the identifier. */ | |
2496 | token = cp_parser_require (parser, CPP_NAME, "identifier"); | |
2497 | /* Return the value. */ | |
2498 | return token ? token->value : error_mark_node; | |
2499 | } | |
2500 | ||
2501 | /* Basic concepts [gram.basic] */ | |
2502 | ||
2503 | /* Parse a translation-unit. | |
2504 | ||
2505 | translation-unit: | |
2506 | declaration-seq [opt] | |
2507 | ||
2508 | Returns TRUE if all went well. */ | |
2509 | ||
2510 | static bool | |
2511 | cp_parser_translation_unit (parser) | |
2512 | cp_parser *parser; | |
2513 | { | |
2514 | while (true) | |
2515 | { | |
2516 | cp_parser_declaration_seq_opt (parser); | |
2517 | ||
2518 | /* If there are no tokens left then all went well. */ | |
2519 | if (cp_lexer_next_token_is (parser->lexer, CPP_EOF)) | |
2520 | break; | |
2521 | ||
2522 | /* Otherwise, issue an error message. */ | |
2523 | cp_parser_error (parser, "expected declaration"); | |
2524 | return false; | |
2525 | } | |
2526 | ||
2527 | /* Consume the EOF token. */ | |
2528 | cp_parser_require (parser, CPP_EOF, "end-of-file"); | |
2529 | ||
2530 | /* Finish up. */ | |
2531 | finish_translation_unit (); | |
2532 | ||
2533 | /* All went well. */ | |
2534 | return true; | |
2535 | } | |
2536 | ||
2537 | /* Expressions [gram.expr] */ | |
2538 | ||
2539 | /* Parse a primary-expression. | |
2540 | ||
2541 | primary-expression: | |
2542 | literal | |
2543 | this | |
2544 | ( expression ) | |
2545 | id-expression | |
2546 | ||
2547 | GNU Extensions: | |
2548 | ||
2549 | primary-expression: | |
2550 | ( compound-statement ) | |
2551 | __builtin_va_arg ( assignment-expression , type-id ) | |
2552 | ||
2553 | literal: | |
2554 | __null | |
2555 | ||
2556 | Returns a representation of the expression. | |
2557 | ||
2558 | *IDK indicates what kind of id-expression (if any) was present. | |
2559 | ||
2560 | *QUALIFYING_CLASS is set to a non-NULL value if the id-expression can be | |
2561 | used as the operand of a pointer-to-member. In that case, | |
2562 | *QUALIFYING_CLASS gives the class that is used as the qualifying | |
2563 | class in the pointer-to-member. */ | |
2564 | ||
2565 | static tree | |
2566 | cp_parser_primary_expression (cp_parser *parser, | |
2567 | cp_parser_id_kind *idk, | |
2568 | tree *qualifying_class) | |
2569 | { | |
2570 | cp_token *token; | |
2571 | ||
2572 | /* Assume the primary expression is not an id-expression. */ | |
2573 | *idk = CP_PARSER_ID_KIND_NONE; | |
2574 | /* And that it cannot be used as pointer-to-member. */ | |
2575 | *qualifying_class = NULL_TREE; | |
2576 | ||
2577 | /* Peek at the next token. */ | |
2578 | token = cp_lexer_peek_token (parser->lexer); | |
2579 | switch (token->type) | |
2580 | { | |
2581 | /* literal: | |
2582 | integer-literal | |
2583 | character-literal | |
2584 | floating-literal | |
2585 | string-literal | |
2586 | boolean-literal */ | |
2587 | case CPP_CHAR: | |
2588 | case CPP_WCHAR: | |
2589 | case CPP_STRING: | |
2590 | case CPP_WSTRING: | |
2591 | case CPP_NUMBER: | |
2592 | token = cp_lexer_consume_token (parser->lexer); | |
2593 | return token->value; | |
2594 | ||
2595 | case CPP_OPEN_PAREN: | |
2596 | { | |
2597 | tree expr; | |
2598 | bool saved_greater_than_is_operator_p; | |
2599 | ||
2600 | /* Consume the `('. */ | |
2601 | cp_lexer_consume_token (parser->lexer); | |
2602 | /* Within a parenthesized expression, a `>' token is always | |
2603 | the greater-than operator. */ | |
2604 | saved_greater_than_is_operator_p | |
2605 | = parser->greater_than_is_operator_p; | |
2606 | parser->greater_than_is_operator_p = true; | |
2607 | /* If we see `( { ' then we are looking at the beginning of | |
2608 | a GNU statement-expression. */ | |
2609 | if (cp_parser_allow_gnu_extensions_p (parser) | |
2610 | && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)) | |
2611 | { | |
2612 | /* Statement-expressions are not allowed by the standard. */ | |
2613 | if (pedantic) | |
2614 | pedwarn ("ISO C++ forbids braced-groups within expressions"); | |
2615 | ||
2616 | /* And they're not allowed outside of a function-body; you | |
2617 | cannot, for example, write: | |
2618 | ||
2619 | int i = ({ int j = 3; j + 1; }); | |
2620 | ||
2621 | at class or namespace scope. */ | |
2622 | if (!at_function_scope_p ()) | |
2623 | error ("statement-expressions are allowed only inside functions"); | |
2624 | /* Start the statement-expression. */ | |
2625 | expr = begin_stmt_expr (); | |
2626 | /* Parse the compound-statement. */ | |
2627 | cp_parser_compound_statement (parser); | |
2628 | /* Finish up. */ | |
2629 | expr = finish_stmt_expr (expr); | |
2630 | } | |
2631 | else | |
2632 | { | |
2633 | /* Parse the parenthesized expression. */ | |
2634 | expr = cp_parser_expression (parser); | |
2635 | /* Let the front end know that this expression was | |
2636 | enclosed in parentheses. This matters in case, for | |
2637 | example, the expression is of the form `A::B', since | |
2638 | `&A::B' might be a pointer-to-member, but `&(A::B)' is | |
2639 | not. */ | |
2640 | finish_parenthesized_expr (expr); | |
2641 | } | |
2642 | /* The `>' token might be the end of a template-id or | |
2643 | template-parameter-list now. */ | |
2644 | parser->greater_than_is_operator_p | |
2645 | = saved_greater_than_is_operator_p; | |
2646 | /* Consume the `)'. */ | |
2647 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
2648 | cp_parser_skip_to_end_of_statement (parser); | |
2649 | ||
2650 | return expr; | |
2651 | } | |
2652 | ||
2653 | case CPP_KEYWORD: | |
2654 | switch (token->keyword) | |
2655 | { | |
2656 | /* These two are the boolean literals. */ | |
2657 | case RID_TRUE: | |
2658 | cp_lexer_consume_token (parser->lexer); | |
2659 | return boolean_true_node; | |
2660 | case RID_FALSE: | |
2661 | cp_lexer_consume_token (parser->lexer); | |
2662 | return boolean_false_node; | |
2663 | ||
2664 | /* The `__null' literal. */ | |
2665 | case RID_NULL: | |
2666 | cp_lexer_consume_token (parser->lexer); | |
2667 | return null_node; | |
2668 | ||
2669 | /* Recognize the `this' keyword. */ | |
2670 | case RID_THIS: | |
2671 | cp_lexer_consume_token (parser->lexer); | |
2672 | if (parser->local_variables_forbidden_p) | |
2673 | { | |
2674 | error ("`this' may not be used in this context"); | |
2675 | return error_mark_node; | |
2676 | } | |
2677 | return finish_this_expr (); | |
2678 | ||
2679 | /* The `operator' keyword can be the beginning of an | |
2680 | id-expression. */ | |
2681 | case RID_OPERATOR: | |
2682 | goto id_expression; | |
2683 | ||
2684 | case RID_FUNCTION_NAME: | |
2685 | case RID_PRETTY_FUNCTION_NAME: | |
2686 | case RID_C99_FUNCTION_NAME: | |
2687 | /* The symbols __FUNCTION__, __PRETTY_FUNCTION__, and | |
2688 | __func__ are the names of variables -- but they are | |
2689 | treated specially. Therefore, they are handled here, | |
2690 | rather than relying on the generic id-expression logic | |
2691 | below. Gramatically, these names are id-expressions. | |
2692 | ||
2693 | Consume the token. */ | |
2694 | token = cp_lexer_consume_token (parser->lexer); | |
2695 | /* Look up the name. */ | |
2696 | return finish_fname (token->value); | |
2697 | ||
2698 | case RID_VA_ARG: | |
2699 | { | |
2700 | tree expression; | |
2701 | tree type; | |
2702 | ||
2703 | /* The `__builtin_va_arg' construct is used to handle | |
2704 | `va_arg'. Consume the `__builtin_va_arg' token. */ | |
2705 | cp_lexer_consume_token (parser->lexer); | |
2706 | /* Look for the opening `('. */ | |
2707 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
2708 | /* Now, parse the assignment-expression. */ | |
2709 | expression = cp_parser_assignment_expression (parser); | |
2710 | /* Look for the `,'. */ | |
2711 | cp_parser_require (parser, CPP_COMMA, "`,'"); | |
2712 | /* Parse the type-id. */ | |
2713 | type = cp_parser_type_id (parser); | |
2714 | /* Look for the closing `)'. */ | |
2715 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
2716 | ||
2717 | return build_x_va_arg (expression, type); | |
2718 | } | |
2719 | ||
2720 | default: | |
2721 | cp_parser_error (parser, "expected primary-expression"); | |
2722 | return error_mark_node; | |
2723 | } | |
2724 | /* Fall through. */ | |
2725 | ||
2726 | /* An id-expression can start with either an identifier, a | |
2727 | `::' as the beginning of a qualified-id, or the "operator" | |
2728 | keyword. */ | |
2729 | case CPP_NAME: | |
2730 | case CPP_SCOPE: | |
2731 | case CPP_TEMPLATE_ID: | |
2732 | case CPP_NESTED_NAME_SPECIFIER: | |
2733 | { | |
2734 | tree id_expression; | |
2735 | tree decl; | |
2736 | ||
2737 | id_expression: | |
2738 | /* Parse the id-expression. */ | |
2739 | id_expression | |
2740 | = cp_parser_id_expression (parser, | |
2741 | /*template_keyword_p=*/false, | |
2742 | /*check_dependency_p=*/true, | |
2743 | /*template_p=*/NULL); | |
2744 | if (id_expression == error_mark_node) | |
2745 | return error_mark_node; | |
2746 | /* If we have a template-id, then no further lookup is | |
2747 | required. If the template-id was for a template-class, we | |
2748 | will sometimes have a TYPE_DECL at this point. */ | |
2749 | else if (TREE_CODE (id_expression) == TEMPLATE_ID_EXPR | |
2750 | || TREE_CODE (id_expression) == TYPE_DECL) | |
2751 | decl = id_expression; | |
2752 | /* Look up the name. */ | |
2753 | else | |
2754 | { | |
2755 | decl = cp_parser_lookup_name_simple (parser, id_expression); | |
2756 | /* If name lookup gives us a SCOPE_REF, then the | |
2757 | qualifying scope was dependent. Just propagate the | |
2758 | name. */ | |
2759 | if (TREE_CODE (decl) == SCOPE_REF) | |
2760 | { | |
2761 | if (TYPE_P (TREE_OPERAND (decl, 0))) | |
2762 | *qualifying_class = TREE_OPERAND (decl, 0); | |
2763 | return decl; | |
2764 | } | |
2765 | /* Check to see if DECL is a local variable in a context | |
2766 | where that is forbidden. */ | |
2767 | if (parser->local_variables_forbidden_p | |
2768 | && local_variable_p (decl)) | |
2769 | { | |
2770 | /* It might be that we only found DECL because we are | |
2771 | trying to be generous with pre-ISO scoping rules. | |
2772 | For example, consider: | |
2773 | ||
2774 | int i; | |
2775 | void g() { | |
2776 | for (int i = 0; i < 10; ++i) {} | |
2777 | extern void f(int j = i); | |
2778 | } | |
2779 | ||
2780 | Here, name look up will originally find the out | |
2781 | of scope `i'. We need to issue a warning message, | |
2782 | but then use the global `i'. */ | |
2783 | decl = check_for_out_of_scope_variable (decl); | |
2784 | if (local_variable_p (decl)) | |
2785 | { | |
2786 | error ("local variable `%D' may not appear in this context", | |
2787 | decl); | |
2788 | return error_mark_node; | |
2789 | } | |
2790 | } | |
2791 | ||
2792 | /* If unqualified name lookup fails while processing a | |
2793 | template, that just means that we need to do name | |
2794 | lookup again when the template is instantiated. */ | |
2795 | if (!parser->scope | |
2796 | && decl == error_mark_node | |
2797 | && processing_template_decl) | |
2798 | { | |
2799 | *idk = CP_PARSER_ID_KIND_UNQUALIFIED; | |
2800 | return build_min_nt (LOOKUP_EXPR, id_expression); | |
2801 | } | |
2802 | else if (decl == error_mark_node | |
2803 | && !processing_template_decl) | |
2804 | { | |
2805 | if (!parser->scope) | |
2806 | { | |
2807 | /* It may be resolvable as a koenig lookup function | |
2808 | call. */ | |
2809 | *idk = CP_PARSER_ID_KIND_UNQUALIFIED; | |
2810 | return id_expression; | |
2811 | } | |
2812 | else if (TYPE_P (parser->scope) | |
2813 | && !COMPLETE_TYPE_P (parser->scope)) | |
2814 | error ("incomplete type `%T' used in nested name specifier", | |
2815 | parser->scope); | |
2816 | else if (parser->scope != global_namespace) | |
2817 | error ("`%D' is not a member of `%D'", | |
2818 | id_expression, parser->scope); | |
2819 | else | |
2820 | error ("`::%D' has not been declared", id_expression); | |
2821 | } | |
2822 | /* If DECL is a variable would be out of scope under | |
2823 | ANSI/ISO rules, but in scope in the ARM, name lookup | |
2824 | will succeed. Issue a diagnostic here. */ | |
2825 | else | |
2826 | decl = check_for_out_of_scope_variable (decl); | |
2827 | ||
2828 | /* Remember that the name was used in the definition of | |
2829 | the current class so that we can check later to see if | |
2830 | the meaning would have been different after the class | |
2831 | was entirely defined. */ | |
2832 | if (!parser->scope && decl != error_mark_node) | |
2833 | maybe_note_name_used_in_class (id_expression, decl); | |
2834 | } | |
2835 | ||
2836 | /* If we didn't find anything, or what we found was a type, | |
2837 | then this wasn't really an id-expression. */ | |
2838 | if (TREE_CODE (decl) == TYPE_DECL | |
2839 | || TREE_CODE (decl) == NAMESPACE_DECL | |
2840 | || (TREE_CODE (decl) == TEMPLATE_DECL | |
2841 | && !DECL_FUNCTION_TEMPLATE_P (decl))) | |
2842 | { | |
2843 | cp_parser_error (parser, | |
2844 | "expected primary-expression"); | |
2845 | return error_mark_node; | |
2846 | } | |
2847 | ||
2848 | /* If the name resolved to a template parameter, there is no | |
2849 | need to look it up again later. Similarly, we resolve | |
2850 | enumeration constants to their underlying values. */ | |
2851 | if (TREE_CODE (decl) == CONST_DECL) | |
2852 | { | |
2853 | *idk = CP_PARSER_ID_KIND_NONE; | |
2854 | if (DECL_TEMPLATE_PARM_P (decl) || !processing_template_decl) | |
2855 | return DECL_INITIAL (decl); | |
2856 | return decl; | |
2857 | } | |
2858 | else | |
2859 | { | |
2860 | bool dependent_p; | |
2861 | ||
2862 | /* If the declaration was explicitly qualified indicate | |
2863 | that. The semantics of `A::f(3)' are different than | |
2864 | `f(3)' if `f' is virtual. */ | |
2865 | *idk = (parser->scope | |
2866 | ? CP_PARSER_ID_KIND_QUALIFIED | |
2867 | : (TREE_CODE (decl) == TEMPLATE_ID_EXPR | |
2868 | ? CP_PARSER_ID_KIND_TEMPLATE_ID | |
2869 | : CP_PARSER_ID_KIND_UNQUALIFIED)); | |
2870 | ||
2871 | ||
2872 | /* [temp.dep.expr] | |
2873 | ||
2874 | An id-expression is type-dependent if it contains an | |
2875 | identifier that was declared with a dependent type. | |
2876 | ||
2877 | As an optimization, we could choose not to create a | |
2878 | LOOKUP_EXPR for a name that resolved to a local | |
2879 | variable in the template function that we are currently | |
2880 | declaring; such a name cannot ever resolve to anything | |
2881 | else. If we did that we would not have to look up | |
2882 | these names at instantiation time. | |
2883 | ||
2884 | The standard is not very specific about an | |
2885 | id-expression that names a set of overloaded functions. | |
2886 | What if some of them have dependent types and some of | |
2887 | them do not? Presumably, such a name should be treated | |
2888 | as a dependent name. */ | |
2889 | /* Assume the name is not dependent. */ | |
2890 | dependent_p = false; | |
2891 | if (!processing_template_decl) | |
2892 | /* No names are dependent outside a template. */ | |
2893 | ; | |
2894 | /* A template-id where the name of the template was not | |
2895 | resolved is definitely dependent. */ | |
2896 | else if (TREE_CODE (decl) == TEMPLATE_ID_EXPR | |
2897 | && (TREE_CODE (TREE_OPERAND (decl, 0)) | |
2898 | == IDENTIFIER_NODE)) | |
2899 | dependent_p = true; | |
2900 | /* For anything except an overloaded function, just check | |
2901 | its type. */ | |
2902 | else if (!is_overloaded_fn (decl)) | |
2903 | dependent_p | |
2904 | = cp_parser_dependent_type_p (TREE_TYPE (decl)); | |
2905 | /* For a set of overloaded functions, check each of the | |
2906 | functions. */ | |
2907 | else | |
2908 | { | |
2909 | tree fns = decl; | |
2910 | ||
2911 | if (BASELINK_P (fns)) | |
2912 | fns = BASELINK_FUNCTIONS (fns); | |
2913 | ||
2914 | /* For a template-id, check to see if the template | |
2915 | arguments are dependent. */ | |
2916 | if (TREE_CODE (fns) == TEMPLATE_ID_EXPR) | |
2917 | { | |
2918 | tree args = TREE_OPERAND (fns, 1); | |
2919 | ||
2920 | if (args && TREE_CODE (args) == TREE_LIST) | |
2921 | { | |
2922 | while (args) | |
2923 | { | |
2924 | if (cp_parser_dependent_template_arg_p | |
2925 | (TREE_VALUE (args))) | |
2926 | { | |
2927 | dependent_p = true; | |
2928 | break; | |
2929 | } | |
2930 | args = TREE_CHAIN (args); | |
2931 | } | |
2932 | } | |
2933 | else if (args && TREE_CODE (args) == TREE_VEC) | |
2934 | { | |
2935 | int i; | |
2936 | for (i = 0; i < TREE_VEC_LENGTH (args); ++i) | |
2937 | if (cp_parser_dependent_template_arg_p | |
2938 | (TREE_VEC_ELT (args, i))) | |
2939 | { | |
2940 | dependent_p = true; | |
2941 | break; | |
2942 | } | |
2943 | } | |
2944 | ||
2945 | /* The functions are those referred to by the | |
2946 | template-id. */ | |
2947 | fns = TREE_OPERAND (fns, 0); | |
2948 | } | |
2949 | ||
2950 | /* If there are no dependent template arguments, go | |
2951 | through the overlaoded functions. */ | |
2952 | while (fns && !dependent_p) | |
2953 | { | |
2954 | tree fn = OVL_CURRENT (fns); | |
2955 | ||
2956 | /* Member functions of dependent classes are | |
2957 | dependent. */ | |
2958 | if (TREE_CODE (fn) == FUNCTION_DECL | |
2959 | && cp_parser_type_dependent_expression_p (fn)) | |
2960 | dependent_p = true; | |
2961 | else if (TREE_CODE (fn) == TEMPLATE_DECL | |
2962 | && cp_parser_dependent_template_p (fn)) | |
2963 | dependent_p = true; | |
2964 | ||
2965 | fns = OVL_NEXT (fns); | |
2966 | } | |
2967 | } | |
2968 | ||
2969 | /* If the name was dependent on a template parameter, | |
2970 | we will resolve the name at instantiation time. */ | |
2971 | if (dependent_p) | |
2972 | { | |
2973 | /* Create a SCOPE_REF for qualified names. */ | |
2974 | if (parser->scope) | |
2975 | { | |
2976 | if (TYPE_P (parser->scope)) | |
2977 | *qualifying_class = parser->scope; | |
2978 | return build_nt (SCOPE_REF, | |
2979 | parser->scope, | |
2980 | id_expression); | |
2981 | } | |
2982 | /* A TEMPLATE_ID already contains all the information | |
2983 | we need. */ | |
2984 | if (TREE_CODE (id_expression) == TEMPLATE_ID_EXPR) | |
2985 | return id_expression; | |
2986 | /* Create a LOOKUP_EXPR for other unqualified names. */ | |
2987 | return build_min_nt (LOOKUP_EXPR, id_expression); | |
2988 | } | |
2989 | ||
2990 | if (parser->scope) | |
2991 | { | |
2992 | decl = (adjust_result_of_qualified_name_lookup | |
2993 | (decl, parser->scope, current_class_type)); | |
2994 | if (TREE_CODE (decl) == FIELD_DECL || BASELINK_P (decl)) | |
2995 | *qualifying_class = parser->scope; | |
2996 | } | |
2997 | /* Resolve references to variables of anonymous unions | |
2998 | into COMPONENT_REFs. */ | |
2999 | else if (TREE_CODE (decl) == ALIAS_DECL) | |
3000 | decl = DECL_INITIAL (decl); | |
3001 | else | |
3002 | /* Transform references to non-static data members into | |
3003 | COMPONENT_REFs. */ | |
3004 | decl = hack_identifier (decl, id_expression); | |
3005 | } | |
3006 | ||
3007 | if (TREE_DEPRECATED (decl)) | |
3008 | warn_deprecated_use (decl); | |
3009 | ||
3010 | return decl; | |
3011 | } | |
3012 | ||
3013 | /* Anything else is an error. */ | |
3014 | default: | |
3015 | cp_parser_error (parser, "expected primary-expression"); | |
3016 | return error_mark_node; | |
3017 | } | |
3018 | } | |
3019 | ||
3020 | /* Parse an id-expression. | |
3021 | ||
3022 | id-expression: | |
3023 | unqualified-id | |
3024 | qualified-id | |
3025 | ||
3026 | qualified-id: | |
3027 | :: [opt] nested-name-specifier template [opt] unqualified-id | |
3028 | :: identifier | |
3029 | :: operator-function-id | |
3030 | :: template-id | |
3031 | ||
3032 | Return a representation of the unqualified portion of the | |
3033 | identifier. Sets PARSER->SCOPE to the qualifying scope if there is | |
3034 | a `::' or nested-name-specifier. | |
3035 | ||
3036 | Often, if the id-expression was a qualified-id, the caller will | |
3037 | want to make a SCOPE_REF to represent the qualified-id. This | |
3038 | function does not do this in order to avoid wastefully creating | |
3039 | SCOPE_REFs when they are not required. | |
3040 | ||
3041 | If ASSUME_TYPENAME_P is true then we assume that qualified names | |
3042 | are typenames. This flag is set when parsing a declarator-id; | |
3043 | for something like: | |
3044 | ||
3045 | template <class T> | |
3046 | int S<T>::R::i = 3; | |
3047 | ||
3048 | we are supposed to assume that `S<T>::R' is a class. | |
3049 | ||
3050 | If TEMPLATE_KEYWORD_P is true, then we have just seen the | |
3051 | `template' keyword. | |
3052 | ||
3053 | If CHECK_DEPENDENCY_P is false, then names are looked up inside | |
3054 | uninstantiated templates. | |
3055 | ||
3056 | If *TEMPLATE_KEYWORD_P is non-NULL, it is set to true iff the | |
3057 | `template' keyword is used to explicitly indicate that the entity | |
3058 | named is a template. */ | |
3059 | ||
3060 | static tree | |
3061 | cp_parser_id_expression (cp_parser *parser, | |
3062 | bool template_keyword_p, | |
3063 | bool check_dependency_p, | |
3064 | bool *template_p) | |
3065 | { | |
3066 | bool global_scope_p; | |
3067 | bool nested_name_specifier_p; | |
3068 | ||
3069 | /* Assume the `template' keyword was not used. */ | |
3070 | if (template_p) | |
3071 | *template_p = false; | |
3072 | ||
3073 | /* Look for the optional `::' operator. */ | |
3074 | global_scope_p | |
3075 | = (cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false) | |
3076 | != NULL_TREE); | |
3077 | /* Look for the optional nested-name-specifier. */ | |
3078 | nested_name_specifier_p | |
3079 | = (cp_parser_nested_name_specifier_opt (parser, | |
3080 | /*typename_keyword_p=*/false, | |
3081 | check_dependency_p, | |
3082 | /*type_p=*/false) | |
3083 | != NULL_TREE); | |
3084 | /* If there is a nested-name-specifier, then we are looking at | |
3085 | the first qualified-id production. */ | |
3086 | if (nested_name_specifier_p) | |
3087 | { | |
3088 | tree saved_scope; | |
3089 | tree saved_object_scope; | |
3090 | tree saved_qualifying_scope; | |
3091 | tree unqualified_id; | |
3092 | bool is_template; | |
3093 | ||
3094 | /* See if the next token is the `template' keyword. */ | |
3095 | if (!template_p) | |
3096 | template_p = &is_template; | |
3097 | *template_p = cp_parser_optional_template_keyword (parser); | |
3098 | /* Name lookup we do during the processing of the | |
3099 | unqualified-id might obliterate SCOPE. */ | |
3100 | saved_scope = parser->scope; | |
3101 | saved_object_scope = parser->object_scope; | |
3102 | saved_qualifying_scope = parser->qualifying_scope; | |
3103 | /* Process the final unqualified-id. */ | |
3104 | unqualified_id = cp_parser_unqualified_id (parser, *template_p, | |
3105 | check_dependency_p); | |
3106 | /* Restore the SAVED_SCOPE for our caller. */ | |
3107 | parser->scope = saved_scope; | |
3108 | parser->object_scope = saved_object_scope; | |
3109 | parser->qualifying_scope = saved_qualifying_scope; | |
3110 | ||
3111 | return unqualified_id; | |
3112 | } | |
3113 | /* Otherwise, if we are in global scope, then we are looking at one | |
3114 | of the other qualified-id productions. */ | |
3115 | else if (global_scope_p) | |
3116 | { | |
3117 | cp_token *token; | |
3118 | tree id; | |
3119 | ||
3120 | /* We don't know yet whether or not this will be a | |
3121 | template-id. */ | |
3122 | cp_parser_parse_tentatively (parser); | |
3123 | /* Try a template-id. */ | |
3124 | id = cp_parser_template_id (parser, | |
3125 | /*template_keyword_p=*/false, | |
3126 | /*check_dependency_p=*/true); | |
3127 | /* If that worked, we're done. */ | |
3128 | if (cp_parser_parse_definitely (parser)) | |
3129 | return id; | |
3130 | ||
3131 | /* Peek at the next token. */ | |
3132 | token = cp_lexer_peek_token (parser->lexer); | |
3133 | ||
3134 | switch (token->type) | |
3135 | { | |
3136 | case CPP_NAME: | |
3137 | return cp_parser_identifier (parser); | |
3138 | ||
3139 | case CPP_KEYWORD: | |
3140 | if (token->keyword == RID_OPERATOR) | |
3141 | return cp_parser_operator_function_id (parser); | |
3142 | /* Fall through. */ | |
3143 | ||
3144 | default: | |
3145 | cp_parser_error (parser, "expected id-expression"); | |
3146 | return error_mark_node; | |
3147 | } | |
3148 | } | |
3149 | else | |
3150 | return cp_parser_unqualified_id (parser, template_keyword_p, | |
3151 | /*check_dependency_p=*/true); | |
3152 | } | |
3153 | ||
3154 | /* Parse an unqualified-id. | |
3155 | ||
3156 | unqualified-id: | |
3157 | identifier | |
3158 | operator-function-id | |
3159 | conversion-function-id | |
3160 | ~ class-name | |
3161 | template-id | |
3162 | ||
3163 | If TEMPLATE_KEYWORD_P is TRUE, we have just seen the `template' | |
3164 | keyword, in a construct like `A::template ...'. | |
3165 | ||
3166 | Returns a representation of unqualified-id. For the `identifier' | |
3167 | production, an IDENTIFIER_NODE is returned. For the `~ class-name' | |
3168 | production a BIT_NOT_EXPR is returned; the operand of the | |
3169 | BIT_NOT_EXPR is an IDENTIFIER_NODE for the class-name. For the | |
3170 | other productions, see the documentation accompanying the | |
3171 | corresponding parsing functions. If CHECK_DEPENDENCY_P is false, | |
3172 | names are looked up in uninstantiated templates. */ | |
3173 | ||
3174 | static tree | |
3175 | cp_parser_unqualified_id (parser, template_keyword_p, | |
3176 | check_dependency_p) | |
3177 | cp_parser *parser; | |
3178 | bool template_keyword_p; | |
3179 | bool check_dependency_p; | |
3180 | { | |
3181 | cp_token *token; | |
3182 | ||
3183 | /* Peek at the next token. */ | |
3184 | token = cp_lexer_peek_token (parser->lexer); | |
3185 | ||
3186 | switch (token->type) | |
3187 | { | |
3188 | case CPP_NAME: | |
3189 | { | |
3190 | tree id; | |
3191 | ||
3192 | /* We don't know yet whether or not this will be a | |
3193 | template-id. */ | |
3194 | cp_parser_parse_tentatively (parser); | |
3195 | /* Try a template-id. */ | |
3196 | id = cp_parser_template_id (parser, template_keyword_p, | |
3197 | check_dependency_p); | |
3198 | /* If it worked, we're done. */ | |
3199 | if (cp_parser_parse_definitely (parser)) | |
3200 | return id; | |
3201 | /* Otherwise, it's an ordinary identifier. */ | |
3202 | return cp_parser_identifier (parser); | |
3203 | } | |
3204 | ||
3205 | case CPP_TEMPLATE_ID: | |
3206 | return cp_parser_template_id (parser, template_keyword_p, | |
3207 | check_dependency_p); | |
3208 | ||
3209 | case CPP_COMPL: | |
3210 | { | |
3211 | tree type_decl; | |
3212 | tree qualifying_scope; | |
3213 | tree object_scope; | |
3214 | tree scope; | |
3215 | ||
3216 | /* Consume the `~' token. */ | |
3217 | cp_lexer_consume_token (parser->lexer); | |
3218 | /* Parse the class-name. The standard, as written, seems to | |
3219 | say that: | |
3220 | ||
3221 | template <typename T> struct S { ~S (); }; | |
3222 | template <typename T> S<T>::~S() {} | |
3223 | ||
3224 | is invalid, since `~' must be followed by a class-name, but | |
3225 | `S<T>' is dependent, and so not known to be a class. | |
3226 | That's not right; we need to look in uninstantiated | |
3227 | templates. A further complication arises from: | |
3228 | ||
3229 | template <typename T> void f(T t) { | |
3230 | t.T::~T(); | |
3231 | } | |
3232 | ||
3233 | Here, it is not possible to look up `T' in the scope of `T' | |
3234 | itself. We must look in both the current scope, and the | |
3235 | scope of the containing complete expression. | |
3236 | ||
3237 | Yet another issue is: | |
3238 | ||
3239 | struct S { | |
3240 | int S; | |
3241 | ~S(); | |
3242 | }; | |
3243 | ||
3244 | S::~S() {} | |
3245 | ||
3246 | The standard does not seem to say that the `S' in `~S' | |
3247 | should refer to the type `S' and not the data member | |
3248 | `S::S'. */ | |
3249 | ||
3250 | /* DR 244 says that we look up the name after the "~" in the | |
3251 | same scope as we looked up the qualifying name. That idea | |
3252 | isn't fully worked out; it's more complicated than that. */ | |
3253 | scope = parser->scope; | |
3254 | object_scope = parser->object_scope; | |
3255 | qualifying_scope = parser->qualifying_scope; | |
3256 | ||
3257 | /* If the name is of the form "X::~X" it's OK. */ | |
3258 | if (scope && TYPE_P (scope) | |
3259 | && cp_lexer_next_token_is (parser->lexer, CPP_NAME) | |
3260 | && (cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
3261 | == CPP_OPEN_PAREN) | |
3262 | && (cp_lexer_peek_token (parser->lexer)->value | |
3263 | == TYPE_IDENTIFIER (scope))) | |
3264 | { | |
3265 | cp_lexer_consume_token (parser->lexer); | |
3266 | return build_nt (BIT_NOT_EXPR, scope); | |
3267 | } | |
3268 | ||
3269 | /* If there was an explicit qualification (S::~T), first look | |
3270 | in the scope given by the qualification (i.e., S). */ | |
3271 | if (scope) | |
3272 | { | |
3273 | cp_parser_parse_tentatively (parser); | |
3274 | type_decl = cp_parser_class_name (parser, | |
3275 | /*typename_keyword_p=*/false, | |
3276 | /*template_keyword_p=*/false, | |
3277 | /*type_p=*/false, | |
3278 | /*check_access_p=*/true, | |
3279 | /*check_dependency=*/false, | |
3280 | /*class_head_p=*/false); | |
3281 | if (cp_parser_parse_definitely (parser)) | |
3282 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
3283 | } | |
3284 | /* In "N::S::~S", look in "N" as well. */ | |
3285 | if (scope && qualifying_scope) | |
3286 | { | |
3287 | cp_parser_parse_tentatively (parser); | |
3288 | parser->scope = qualifying_scope; | |
3289 | parser->object_scope = NULL_TREE; | |
3290 | parser->qualifying_scope = NULL_TREE; | |
3291 | type_decl | |
3292 | = cp_parser_class_name (parser, | |
3293 | /*typename_keyword_p=*/false, | |
3294 | /*template_keyword_p=*/false, | |
3295 | /*type_p=*/false, | |
3296 | /*check_access_p=*/true, | |
3297 | /*check_dependency=*/false, | |
3298 | /*class_head_p=*/false); | |
3299 | if (cp_parser_parse_definitely (parser)) | |
3300 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
3301 | } | |
3302 | /* In "p->S::~T", look in the scope given by "*p" as well. */ | |
3303 | else if (object_scope) | |
3304 | { | |
3305 | cp_parser_parse_tentatively (parser); | |
3306 | parser->scope = object_scope; | |
3307 | parser->object_scope = NULL_TREE; | |
3308 | parser->qualifying_scope = NULL_TREE; | |
3309 | type_decl | |
3310 | = cp_parser_class_name (parser, | |
3311 | /*typename_keyword_p=*/false, | |
3312 | /*template_keyword_p=*/false, | |
3313 | /*type_p=*/false, | |
3314 | /*check_access_p=*/true, | |
3315 | /*check_dependency=*/false, | |
3316 | /*class_head_p=*/false); | |
3317 | if (cp_parser_parse_definitely (parser)) | |
3318 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
3319 | } | |
3320 | /* Look in the surrounding context. */ | |
3321 | parser->scope = NULL_TREE; | |
3322 | parser->object_scope = NULL_TREE; | |
3323 | parser->qualifying_scope = NULL_TREE; | |
3324 | type_decl | |
3325 | = cp_parser_class_name (parser, | |
3326 | /*typename_keyword_p=*/false, | |
3327 | /*template_keyword_p=*/false, | |
3328 | /*type_p=*/false, | |
3329 | /*check_access_p=*/true, | |
3330 | /*check_dependency=*/false, | |
3331 | /*class_head_p=*/false); | |
3332 | /* If an error occurred, assume that the name of the | |
3333 | destructor is the same as the name of the qualifying | |
3334 | class. That allows us to keep parsing after running | |
3335 | into ill-formed destructor names. */ | |
3336 | if (type_decl == error_mark_node && scope && TYPE_P (scope)) | |
3337 | return build_nt (BIT_NOT_EXPR, scope); | |
3338 | else if (type_decl == error_mark_node) | |
3339 | return error_mark_node; | |
3340 | ||
3341 | return build_nt (BIT_NOT_EXPR, TREE_TYPE (type_decl)); | |
3342 | } | |
3343 | ||
3344 | case CPP_KEYWORD: | |
3345 | if (token->keyword == RID_OPERATOR) | |
3346 | { | |
3347 | tree id; | |
3348 | ||
3349 | /* This could be a template-id, so we try that first. */ | |
3350 | cp_parser_parse_tentatively (parser); | |
3351 | /* Try a template-id. */ | |
3352 | id = cp_parser_template_id (parser, template_keyword_p, | |
3353 | /*check_dependency_p=*/true); | |
3354 | /* If that worked, we're done. */ | |
3355 | if (cp_parser_parse_definitely (parser)) | |
3356 | return id; | |
3357 | /* We still don't know whether we're looking at an | |
3358 | operator-function-id or a conversion-function-id. */ | |
3359 | cp_parser_parse_tentatively (parser); | |
3360 | /* Try an operator-function-id. */ | |
3361 | id = cp_parser_operator_function_id (parser); | |
3362 | /* If that didn't work, try a conversion-function-id. */ | |
3363 | if (!cp_parser_parse_definitely (parser)) | |
3364 | id = cp_parser_conversion_function_id (parser); | |
3365 | ||
3366 | return id; | |
3367 | } | |
3368 | /* Fall through. */ | |
3369 | ||
3370 | default: | |
3371 | cp_parser_error (parser, "expected unqualified-id"); | |
3372 | return error_mark_node; | |
3373 | } | |
3374 | } | |
3375 | ||
3376 | /* Parse an (optional) nested-name-specifier. | |
3377 | ||
3378 | nested-name-specifier: | |
3379 | class-or-namespace-name :: nested-name-specifier [opt] | |
3380 | class-or-namespace-name :: template nested-name-specifier [opt] | |
3381 | ||
3382 | PARSER->SCOPE should be set appropriately before this function is | |
3383 | called. TYPENAME_KEYWORD_P is TRUE if the `typename' keyword is in | |
3384 | effect. TYPE_P is TRUE if we non-type bindings should be ignored | |
3385 | in name lookups. | |
3386 | ||
3387 | Sets PARSER->SCOPE to the class (TYPE) or namespace | |
3388 | (NAMESPACE_DECL) specified by the nested-name-specifier, or leaves | |
3389 | it unchanged if there is no nested-name-specifier. Returns the new | |
3390 | scope iff there is a nested-name-specifier, or NULL_TREE otherwise. */ | |
3391 | ||
3392 | static tree | |
3393 | cp_parser_nested_name_specifier_opt (cp_parser *parser, | |
3394 | bool typename_keyword_p, | |
3395 | bool check_dependency_p, | |
3396 | bool type_p) | |
3397 | { | |
3398 | bool success = false; | |
3399 | tree access_check = NULL_TREE; | |
3400 | ptrdiff_t start; | |
3401 | ||
3402 | /* If the next token corresponds to a nested name specifier, there | |
3403 | is no need to reparse it. */ | |
3404 | if (cp_lexer_next_token_is (parser->lexer, CPP_NESTED_NAME_SPECIFIER)) | |
3405 | { | |
3406 | tree value; | |
3407 | tree check; | |
3408 | ||
3409 | /* Get the stored value. */ | |
3410 | value = cp_lexer_consume_token (parser->lexer)->value; | |
3411 | /* Perform any access checks that were deferred. */ | |
3412 | for (check = TREE_PURPOSE (value); check; check = TREE_CHAIN (check)) | |
3413 | cp_parser_defer_access_check (parser, | |
3414 | TREE_PURPOSE (check), | |
3415 | TREE_VALUE (check)); | |
3416 | /* Set the scope from the stored value. */ | |
3417 | parser->scope = TREE_VALUE (value); | |
3418 | parser->qualifying_scope = TREE_TYPE (value); | |
3419 | parser->object_scope = NULL_TREE; | |
3420 | return parser->scope; | |
3421 | } | |
3422 | ||
3423 | /* Remember where the nested-name-specifier starts. */ | |
3424 | if (cp_parser_parsing_tentatively (parser) | |
3425 | && !cp_parser_committed_to_tentative_parse (parser)) | |
3426 | { | |
3427 | cp_token *next_token = cp_lexer_peek_token (parser->lexer); | |
3428 | start = cp_lexer_token_difference (parser->lexer, | |
3429 | parser->lexer->first_token, | |
3430 | next_token); | |
3431 | access_check = parser->context->deferred_access_checks; | |
3432 | } | |
3433 | else | |
3434 | start = -1; | |
3435 | ||
3436 | while (true) | |
3437 | { | |
3438 | tree new_scope; | |
3439 | tree old_scope; | |
3440 | tree saved_qualifying_scope; | |
3441 | cp_token *token; | |
3442 | bool template_keyword_p; | |
3443 | ||
3444 | /* Spot cases that cannot be the beginning of a | |
3445 | nested-name-specifier. On the second and subsequent times | |
3446 | through the loop, we look for the `template' keyword. */ | |
3447 | if (success | |
3448 | && cp_lexer_next_token_is_keyword (parser->lexer, | |
3449 | RID_TEMPLATE)) | |
3450 | ; | |
3451 | /* A template-id can start a nested-name-specifier. */ | |
3452 | else if (cp_lexer_next_token_is (parser->lexer, CPP_TEMPLATE_ID)) | |
3453 | ; | |
3454 | else | |
3455 | { | |
3456 | /* If the next token is not an identifier, then it is | |
3457 | definitely not a class-or-namespace-name. */ | |
3458 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_NAME)) | |
3459 | break; | |
3460 | /* If the following token is neither a `<' (to begin a | |
3461 | template-id), nor a `::', then we are not looking at a | |
3462 | nested-name-specifier. */ | |
3463 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
3464 | if (token->type != CPP_LESS && token->type != CPP_SCOPE) | |
3465 | break; | |
3466 | } | |
3467 | ||
3468 | /* The nested-name-specifier is optional, so we parse | |
3469 | tentatively. */ | |
3470 | cp_parser_parse_tentatively (parser); | |
3471 | ||
3472 | /* Look for the optional `template' keyword, if this isn't the | |
3473 | first time through the loop. */ | |
3474 | if (success) | |
3475 | template_keyword_p = cp_parser_optional_template_keyword (parser); | |
3476 | else | |
3477 | template_keyword_p = false; | |
3478 | ||
3479 | /* Save the old scope since the name lookup we are about to do | |
3480 | might destroy it. */ | |
3481 | old_scope = parser->scope; | |
3482 | saved_qualifying_scope = parser->qualifying_scope; | |
3483 | /* Parse the qualifying entity. */ | |
3484 | new_scope | |
3485 | = cp_parser_class_or_namespace_name (parser, | |
3486 | typename_keyword_p, | |
3487 | template_keyword_p, | |
3488 | check_dependency_p, | |
3489 | type_p); | |
3490 | /* Look for the `::' token. */ | |
3491 | cp_parser_require (parser, CPP_SCOPE, "`::'"); | |
3492 | ||
3493 | /* If we found what we wanted, we keep going; otherwise, we're | |
3494 | done. */ | |
3495 | if (!cp_parser_parse_definitely (parser)) | |
3496 | { | |
3497 | bool error_p = false; | |
3498 | ||
3499 | /* Restore the OLD_SCOPE since it was valid before the | |
3500 | failed attempt at finding the last | |
3501 | class-or-namespace-name. */ | |
3502 | parser->scope = old_scope; | |
3503 | parser->qualifying_scope = saved_qualifying_scope; | |
3504 | /* If the next token is an identifier, and the one after | |
3505 | that is a `::', then any valid interpretation would have | |
3506 | found a class-or-namespace-name. */ | |
3507 | while (cp_lexer_next_token_is (parser->lexer, CPP_NAME) | |
3508 | && (cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
3509 | == CPP_SCOPE) | |
3510 | && (cp_lexer_peek_nth_token (parser->lexer, 3)->type | |
3511 | != CPP_COMPL)) | |
3512 | { | |
3513 | token = cp_lexer_consume_token (parser->lexer); | |
3514 | if (!error_p) | |
3515 | { | |
3516 | tree decl; | |
3517 | ||
3518 | decl = cp_parser_lookup_name_simple (parser, token->value); | |
3519 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
3520 | error ("`%D' used without template parameters", | |
3521 | decl); | |
3522 | else if (parser->scope) | |
3523 | { | |
3524 | if (TYPE_P (parser->scope)) | |
3525 | error ("`%T::%D' is not a class-name or " | |
3526 | "namespace-name", | |
3527 | parser->scope, token->value); | |
3528 | else | |
3529 | error ("`%D::%D' is not a class-name or " | |
3530 | "namespace-name", | |
3531 | parser->scope, token->value); | |
3532 | } | |
3533 | else | |
3534 | error ("`%D' is not a class-name or namespace-name", | |
3535 | token->value); | |
3536 | parser->scope = NULL_TREE; | |
3537 | error_p = true; | |
3538 | } | |
3539 | cp_lexer_consume_token (parser->lexer); | |
3540 | } | |
3541 | break; | |
3542 | } | |
3543 | ||
3544 | /* We've found one valid nested-name-specifier. */ | |
3545 | success = true; | |
3546 | /* Make sure we look in the right scope the next time through | |
3547 | the loop. */ | |
3548 | parser->scope = (TREE_CODE (new_scope) == TYPE_DECL | |
3549 | ? TREE_TYPE (new_scope) | |
3550 | : new_scope); | |
3551 | /* If it is a class scope, try to complete it; we are about to | |
3552 | be looking up names inside the class. */ | |
3553 | if (TYPE_P (parser->scope)) | |
3554 | complete_type (parser->scope); | |
3555 | } | |
3556 | ||
3557 | /* If parsing tentatively, replace the sequence of tokens that makes | |
3558 | up the nested-name-specifier with a CPP_NESTED_NAME_SPECIFIER | |
3559 | token. That way, should we re-parse the token stream, we will | |
3560 | not have to repeat the effort required to do the parse, nor will | |
3561 | we issue duplicate error messages. */ | |
3562 | if (success && start >= 0) | |
3563 | { | |
3564 | cp_token *token; | |
3565 | tree c; | |
3566 | ||
3567 | /* Find the token that corresponds to the start of the | |
3568 | template-id. */ | |
3569 | token = cp_lexer_advance_token (parser->lexer, | |
3570 | parser->lexer->first_token, | |
3571 | start); | |
3572 | ||
3573 | /* Remember the access checks associated with this | |
3574 | nested-name-specifier. */ | |
3575 | c = parser->context->deferred_access_checks; | |
3576 | if (c == access_check) | |
3577 | access_check = NULL_TREE; | |
3578 | else | |
3579 | { | |
3580 | while (TREE_CHAIN (c) != access_check) | |
3581 | c = TREE_CHAIN (c); | |
3582 | access_check = parser->context->deferred_access_checks; | |
3583 | parser->context->deferred_access_checks = TREE_CHAIN (c); | |
3584 | TREE_CHAIN (c) = NULL_TREE; | |
3585 | } | |
3586 | ||
3587 | /* Reset the contents of the START token. */ | |
3588 | token->type = CPP_NESTED_NAME_SPECIFIER; | |
3589 | token->value = build_tree_list (access_check, parser->scope); | |
3590 | TREE_TYPE (token->value) = parser->qualifying_scope; | |
3591 | token->keyword = RID_MAX; | |
3592 | /* Purge all subsequent tokens. */ | |
3593 | cp_lexer_purge_tokens_after (parser->lexer, token); | |
3594 | } | |
3595 | ||
3596 | return success ? parser->scope : NULL_TREE; | |
3597 | } | |
3598 | ||
3599 | /* Parse a nested-name-specifier. See | |
3600 | cp_parser_nested_name_specifier_opt for details. This function | |
3601 | behaves identically, except that it will an issue an error if no | |
3602 | nested-name-specifier is present, and it will return | |
3603 | ERROR_MARK_NODE, rather than NULL_TREE, if no nested-name-specifier | |
3604 | is present. */ | |
3605 | ||
3606 | static tree | |
3607 | cp_parser_nested_name_specifier (cp_parser *parser, | |
3608 | bool typename_keyword_p, | |
3609 | bool check_dependency_p, | |
3610 | bool type_p) | |
3611 | { | |
3612 | tree scope; | |
3613 | ||
3614 | /* Look for the nested-name-specifier. */ | |
3615 | scope = cp_parser_nested_name_specifier_opt (parser, | |
3616 | typename_keyword_p, | |
3617 | check_dependency_p, | |
3618 | type_p); | |
3619 | /* If it was not present, issue an error message. */ | |
3620 | if (!scope) | |
3621 | { | |
3622 | cp_parser_error (parser, "expected nested-name-specifier"); | |
3623 | return error_mark_node; | |
3624 | } | |
3625 | ||
3626 | return scope; | |
3627 | } | |
3628 | ||
3629 | /* Parse a class-or-namespace-name. | |
3630 | ||
3631 | class-or-namespace-name: | |
3632 | class-name | |
3633 | namespace-name | |
3634 | ||
3635 | TYPENAME_KEYWORD_P is TRUE iff the `typename' keyword is in effect. | |
3636 | TEMPLATE_KEYWORD_P is TRUE iff the `template' keyword is in effect. | |
3637 | CHECK_DEPENDENCY_P is FALSE iff dependent names should be looked up. | |
3638 | TYPE_P is TRUE iff the next name should be taken as a class-name, | |
3639 | even the same name is declared to be another entity in the same | |
3640 | scope. | |
3641 | ||
3642 | Returns the class (TYPE_DECL) or namespace (NAMESPACE_DECL) | |
3643 | specified by the class-or-namespace-name. */ | |
3644 | ||
3645 | static tree | |
3646 | cp_parser_class_or_namespace_name (cp_parser *parser, | |
3647 | bool typename_keyword_p, | |
3648 | bool template_keyword_p, | |
3649 | bool check_dependency_p, | |
3650 | bool type_p) | |
3651 | { | |
3652 | tree saved_scope; | |
3653 | tree saved_qualifying_scope; | |
3654 | tree saved_object_scope; | |
3655 | tree scope; | |
3656 | ||
3657 | /* If the next token is the `template' keyword, we know that we are | |
3658 | looking at a class-name. */ | |
3659 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
3660 | return cp_parser_class_name (parser, | |
3661 | typename_keyword_p, | |
3662 | template_keyword_p, | |
3663 | type_p, | |
3664 | /*check_access_p=*/true, | |
3665 | check_dependency_p, | |
3666 | /*class_head_p=*/false); | |
3667 | /* Before we try to parse the class-name, we must save away the | |
3668 | current PARSER->SCOPE since cp_parser_class_name will destroy | |
3669 | it. */ | |
3670 | saved_scope = parser->scope; | |
3671 | saved_qualifying_scope = parser->qualifying_scope; | |
3672 | saved_object_scope = parser->object_scope; | |
3673 | /* Try for a class-name first. */ | |
3674 | cp_parser_parse_tentatively (parser); | |
3675 | scope = cp_parser_class_name (parser, | |
3676 | typename_keyword_p, | |
3677 | template_keyword_p, | |
3678 | type_p, | |
3679 | /*check_access_p=*/true, | |
3680 | check_dependency_p, | |
3681 | /*class_head_p=*/false); | |
3682 | /* If that didn't work, try for a namespace-name. */ | |
3683 | if (!cp_parser_parse_definitely (parser)) | |
3684 | { | |
3685 | /* Restore the saved scope. */ | |
3686 | parser->scope = saved_scope; | |
3687 | parser->qualifying_scope = saved_qualifying_scope; | |
3688 | parser->object_scope = saved_object_scope; | |
3689 | /* Now look for a namespace-name. */ | |
3690 | scope = cp_parser_namespace_name (parser); | |
3691 | } | |
3692 | ||
3693 | return scope; | |
3694 | } | |
3695 | ||
3696 | /* Parse a postfix-expression. | |
3697 | ||
3698 | postfix-expression: | |
3699 | primary-expression | |
3700 | postfix-expression [ expression ] | |
3701 | postfix-expression ( expression-list [opt] ) | |
3702 | simple-type-specifier ( expression-list [opt] ) | |
3703 | typename :: [opt] nested-name-specifier identifier | |
3704 | ( expression-list [opt] ) | |
3705 | typename :: [opt] nested-name-specifier template [opt] template-id | |
3706 | ( expression-list [opt] ) | |
3707 | postfix-expression . template [opt] id-expression | |
3708 | postfix-expression -> template [opt] id-expression | |
3709 | postfix-expression . pseudo-destructor-name | |
3710 | postfix-expression -> pseudo-destructor-name | |
3711 | postfix-expression ++ | |
3712 | postfix-expression -- | |
3713 | dynamic_cast < type-id > ( expression ) | |
3714 | static_cast < type-id > ( expression ) | |
3715 | reinterpret_cast < type-id > ( expression ) | |
3716 | const_cast < type-id > ( expression ) | |
3717 | typeid ( expression ) | |
3718 | typeid ( type-id ) | |
3719 | ||
3720 | GNU Extension: | |
3721 | ||
3722 | postfix-expression: | |
3723 | ( type-id ) { initializer-list , [opt] } | |
3724 | ||
3725 | This extension is a GNU version of the C99 compound-literal | |
3726 | construct. (The C99 grammar uses `type-name' instead of `type-id', | |
3727 | but they are essentially the same concept.) | |
3728 | ||
3729 | If ADDRESS_P is true, the postfix expression is the operand of the | |
3730 | `&' operator. | |
3731 | ||
3732 | Returns a representation of the expression. */ | |
3733 | ||
3734 | static tree | |
3735 | cp_parser_postfix_expression (cp_parser *parser, bool address_p) | |
3736 | { | |
3737 | cp_token *token; | |
3738 | enum rid keyword; | |
3739 | cp_parser_id_kind idk = CP_PARSER_ID_KIND_NONE; | |
3740 | tree postfix_expression = NULL_TREE; | |
3741 | /* Non-NULL only if the current postfix-expression can be used to | |
3742 | form a pointer-to-member. In that case, QUALIFYING_CLASS is the | |
3743 | class used to qualify the member. */ | |
3744 | tree qualifying_class = NULL_TREE; | |
3745 | bool done; | |
3746 | ||
3747 | /* Peek at the next token. */ | |
3748 | token = cp_lexer_peek_token (parser->lexer); | |
3749 | /* Some of the productions are determined by keywords. */ | |
3750 | keyword = token->keyword; | |
3751 | switch (keyword) | |
3752 | { | |
3753 | case RID_DYNCAST: | |
3754 | case RID_STATCAST: | |
3755 | case RID_REINTCAST: | |
3756 | case RID_CONSTCAST: | |
3757 | { | |
3758 | tree type; | |
3759 | tree expression; | |
3760 | const char *saved_message; | |
3761 | ||
3762 | /* All of these can be handled in the same way from the point | |
3763 | of view of parsing. Begin by consuming the token | |
3764 | identifying the cast. */ | |
3765 | cp_lexer_consume_token (parser->lexer); | |
3766 | ||
3767 | /* New types cannot be defined in the cast. */ | |
3768 | saved_message = parser->type_definition_forbidden_message; | |
3769 | parser->type_definition_forbidden_message | |
3770 | = "types may not be defined in casts"; | |
3771 | ||
3772 | /* Look for the opening `<'. */ | |
3773 | cp_parser_require (parser, CPP_LESS, "`<'"); | |
3774 | /* Parse the type to which we are casting. */ | |
3775 | type = cp_parser_type_id (parser); | |
3776 | /* Look for the closing `>'. */ | |
3777 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
3778 | /* Restore the old message. */ | |
3779 | parser->type_definition_forbidden_message = saved_message; | |
3780 | ||
3781 | /* And the expression which is being cast. */ | |
3782 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
3783 | expression = cp_parser_expression (parser); | |
3784 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3785 | ||
3786 | switch (keyword) | |
3787 | { | |
3788 | case RID_DYNCAST: | |
3789 | postfix_expression | |
3790 | = build_dynamic_cast (type, expression); | |
3791 | break; | |
3792 | case RID_STATCAST: | |
3793 | postfix_expression | |
3794 | = build_static_cast (type, expression); | |
3795 | break; | |
3796 | case RID_REINTCAST: | |
3797 | postfix_expression | |
3798 | = build_reinterpret_cast (type, expression); | |
3799 | break; | |
3800 | case RID_CONSTCAST: | |
3801 | postfix_expression | |
3802 | = build_const_cast (type, expression); | |
3803 | break; | |
3804 | default: | |
3805 | abort (); | |
3806 | } | |
3807 | } | |
3808 | break; | |
3809 | ||
3810 | case RID_TYPEID: | |
3811 | { | |
3812 | tree type; | |
3813 | const char *saved_message; | |
3814 | ||
3815 | /* Consume the `typeid' token. */ | |
3816 | cp_lexer_consume_token (parser->lexer); | |
3817 | /* Look for the `(' token. */ | |
3818 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
3819 | /* Types cannot be defined in a `typeid' expression. */ | |
3820 | saved_message = parser->type_definition_forbidden_message; | |
3821 | parser->type_definition_forbidden_message | |
3822 | = "types may not be defined in a `typeid\' expression"; | |
3823 | /* We can't be sure yet whether we're looking at a type-id or an | |
3824 | expression. */ | |
3825 | cp_parser_parse_tentatively (parser); | |
3826 | /* Try a type-id first. */ | |
3827 | type = cp_parser_type_id (parser); | |
3828 | /* Look for the `)' token. Otherwise, we can't be sure that | |
3829 | we're not looking at an expression: consider `typeid (int | |
3830 | (3))', for example. */ | |
3831 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3832 | /* If all went well, simply lookup the type-id. */ | |
3833 | if (cp_parser_parse_definitely (parser)) | |
3834 | postfix_expression = get_typeid (type); | |
3835 | /* Otherwise, fall back to the expression variant. */ | |
3836 | else | |
3837 | { | |
3838 | tree expression; | |
3839 | ||
3840 | /* Look for an expression. */ | |
3841 | expression = cp_parser_expression (parser); | |
3842 | /* Compute its typeid. */ | |
3843 | postfix_expression = build_typeid (expression); | |
3844 | /* Look for the `)' token. */ | |
3845 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3846 | } | |
3847 | ||
3848 | /* Restore the saved message. */ | |
3849 | parser->type_definition_forbidden_message = saved_message; | |
3850 | } | |
3851 | break; | |
3852 | ||
3853 | case RID_TYPENAME: | |
3854 | { | |
3855 | bool template_p = false; | |
3856 | tree id; | |
3857 | tree type; | |
3858 | ||
3859 | /* Consume the `typename' token. */ | |
3860 | cp_lexer_consume_token (parser->lexer); | |
3861 | /* Look for the optional `::' operator. */ | |
3862 | cp_parser_global_scope_opt (parser, | |
3863 | /*current_scope_valid_p=*/false); | |
3864 | /* Look for the nested-name-specifier. */ | |
3865 | cp_parser_nested_name_specifier (parser, | |
3866 | /*typename_keyword_p=*/true, | |
3867 | /*check_dependency_p=*/true, | |
3868 | /*type_p=*/true); | |
3869 | /* Look for the optional `template' keyword. */ | |
3870 | template_p = cp_parser_optional_template_keyword (parser); | |
3871 | /* We don't know whether we're looking at a template-id or an | |
3872 | identifier. */ | |
3873 | cp_parser_parse_tentatively (parser); | |
3874 | /* Try a template-id. */ | |
3875 | id = cp_parser_template_id (parser, template_p, | |
3876 | /*check_dependency_p=*/true); | |
3877 | /* If that didn't work, try an identifier. */ | |
3878 | if (!cp_parser_parse_definitely (parser)) | |
3879 | id = cp_parser_identifier (parser); | |
3880 | /* Create a TYPENAME_TYPE to represent the type to which the | |
3881 | functional cast is being performed. */ | |
3882 | type = make_typename_type (parser->scope, id, | |
3883 | /*complain=*/1); | |
3884 | ||
3885 | postfix_expression = cp_parser_functional_cast (parser, type); | |
3886 | } | |
3887 | break; | |
3888 | ||
3889 | default: | |
3890 | { | |
3891 | tree type; | |
3892 | ||
3893 | /* If the next thing is a simple-type-specifier, we may be | |
3894 | looking at a functional cast. We could also be looking at | |
3895 | an id-expression. So, we try the functional cast, and if | |
3896 | that doesn't work we fall back to the primary-expression. */ | |
3897 | cp_parser_parse_tentatively (parser); | |
3898 | /* Look for the simple-type-specifier. */ | |
3899 | type = cp_parser_simple_type_specifier (parser, | |
3900 | CP_PARSER_FLAGS_NONE); | |
3901 | /* Parse the cast itself. */ | |
3902 | if (!cp_parser_error_occurred (parser)) | |
3903 | postfix_expression | |
3904 | = cp_parser_functional_cast (parser, type); | |
3905 | /* If that worked, we're done. */ | |
3906 | if (cp_parser_parse_definitely (parser)) | |
3907 | break; | |
3908 | ||
3909 | /* If the functional-cast didn't work out, try a | |
3910 | compound-literal. */ | |
3911 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
3912 | { | |
3913 | tree initializer_list = NULL_TREE; | |
3914 | ||
3915 | cp_parser_parse_tentatively (parser); | |
3916 | /* Look for the `('. */ | |
3917 | if (cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) | |
3918 | { | |
3919 | type = cp_parser_type_id (parser); | |
3920 | /* Look for the `)'. */ | |
3921 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
3922 | /* Look for the `{'. */ | |
3923 | cp_parser_require (parser, CPP_OPEN_BRACE, "`{'"); | |
3924 | /* If things aren't going well, there's no need to | |
3925 | keep going. */ | |
3926 | if (!cp_parser_error_occurred (parser)) | |
3927 | { | |
3928 | /* Parse the initializer-list. */ | |
3929 | initializer_list | |
3930 | = cp_parser_initializer_list (parser); | |
3931 | /* Allow a trailing `,'. */ | |
3932 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
3933 | cp_lexer_consume_token (parser->lexer); | |
3934 | /* Look for the final `}'. */ | |
3935 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
3936 | } | |
3937 | } | |
3938 | /* If that worked, we're definitely looking at a | |
3939 | compound-literal expression. */ | |
3940 | if (cp_parser_parse_definitely (parser)) | |
3941 | { | |
3942 | /* Warn the user that a compound literal is not | |
3943 | allowed in standard C++. */ | |
3944 | if (pedantic) | |
3945 | pedwarn ("ISO C++ forbids compound-literals"); | |
3946 | /* Form the representation of the compound-literal. */ | |
3947 | postfix_expression | |
3948 | = finish_compound_literal (type, initializer_list); | |
3949 | break; | |
3950 | } | |
3951 | } | |
3952 | ||
3953 | /* It must be a primary-expression. */ | |
3954 | postfix_expression = cp_parser_primary_expression (parser, | |
3955 | &idk, | |
3956 | &qualifying_class); | |
3957 | } | |
3958 | break; | |
3959 | } | |
3960 | ||
3961 | /* Peek at the next token. */ | |
3962 | token = cp_lexer_peek_token (parser->lexer); | |
3963 | done = (token->type != CPP_OPEN_SQUARE | |
3964 | && token->type != CPP_OPEN_PAREN | |
3965 | && token->type != CPP_DOT | |
3966 | && token->type != CPP_DEREF | |
3967 | && token->type != CPP_PLUS_PLUS | |
3968 | && token->type != CPP_MINUS_MINUS); | |
3969 | ||
3970 | /* If the postfix expression is complete, finish up. */ | |
3971 | if (address_p && qualifying_class && done) | |
3972 | { | |
3973 | if (TREE_CODE (postfix_expression) == SCOPE_REF) | |
3974 | postfix_expression = TREE_OPERAND (postfix_expression, 1); | |
3975 | postfix_expression | |
3976 | = build_offset_ref (qualifying_class, postfix_expression); | |
3977 | return postfix_expression; | |
3978 | } | |
3979 | ||
3980 | /* Otherwise, if we were avoiding committing until we knew | |
3981 | whether or not we had a pointer-to-member, we now know that | |
3982 | the expression is an ordinary reference to a qualified name. */ | |
3983 | if (qualifying_class && !processing_template_decl) | |
3984 | { | |
3985 | if (TREE_CODE (postfix_expression) == FIELD_DECL) | |
3986 | postfix_expression | |
3987 | = finish_non_static_data_member (postfix_expression, | |
3988 | qualifying_class); | |
3989 | else if (BASELINK_P (postfix_expression)) | |
3990 | { | |
3991 | tree fn; | |
3992 | tree fns; | |
3993 | ||
3994 | /* See if any of the functions are non-static members. */ | |
3995 | fns = BASELINK_FUNCTIONS (postfix_expression); | |
3996 | if (TREE_CODE (fns) == TEMPLATE_ID_EXPR) | |
3997 | fns = TREE_OPERAND (fns, 0); | |
3998 | for (fn = fns; fn; fn = OVL_NEXT (fn)) | |
3999 | if (DECL_NONSTATIC_MEMBER_FUNCTION_P (fn)) | |
4000 | break; | |
4001 | /* If so, the expression may be relative to the current | |
4002 | class. */ | |
4003 | if (fn && current_class_type | |
4004 | && DERIVED_FROM_P (qualifying_class, current_class_type)) | |
4005 | postfix_expression | |
4006 | = (build_class_member_access_expr | |
4007 | (maybe_dummy_object (qualifying_class, NULL), | |
4008 | postfix_expression, | |
4009 | BASELINK_ACCESS_BINFO (postfix_expression), | |
4010 | /*preserve_reference=*/false)); | |
4011 | else if (done) | |
4012 | return build_offset_ref (qualifying_class, | |
4013 | postfix_expression); | |
4014 | } | |
4015 | } | |
4016 | ||
4017 | /* Remember that there was a reference to this entity. */ | |
4018 | if (DECL_P (postfix_expression)) | |
4019 | mark_used (postfix_expression); | |
4020 | ||
4021 | /* Keep looping until the postfix-expression is complete. */ | |
4022 | while (true) | |
4023 | { | |
4024 | if (TREE_CODE (postfix_expression) == IDENTIFIER_NODE | |
4025 | && cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_PAREN)) | |
4026 | { | |
4027 | /* It is not a Koenig lookup function call. */ | |
4028 | unqualified_name_lookup_error (postfix_expression); | |
4029 | postfix_expression = error_mark_node; | |
4030 | } | |
4031 | ||
4032 | /* Peek at the next token. */ | |
4033 | token = cp_lexer_peek_token (parser->lexer); | |
4034 | ||
4035 | switch (token->type) | |
4036 | { | |
4037 | case CPP_OPEN_SQUARE: | |
4038 | /* postfix-expression [ expression ] */ | |
4039 | { | |
4040 | tree index; | |
4041 | ||
4042 | /* Consume the `[' token. */ | |
4043 | cp_lexer_consume_token (parser->lexer); | |
4044 | /* Parse the index expression. */ | |
4045 | index = cp_parser_expression (parser); | |
4046 | /* Look for the closing `]'. */ | |
4047 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
4048 | ||
4049 | /* Build the ARRAY_REF. */ | |
4050 | postfix_expression | |
4051 | = grok_array_decl (postfix_expression, index); | |
4052 | idk = CP_PARSER_ID_KIND_NONE; | |
4053 | } | |
4054 | break; | |
4055 | ||
4056 | case CPP_OPEN_PAREN: | |
4057 | /* postfix-expression ( expression-list [opt] ) */ | |
4058 | { | |
4059 | tree args; | |
4060 | ||
4061 | /* Consume the `(' token. */ | |
4062 | cp_lexer_consume_token (parser->lexer); | |
4063 | /* If the next token is not a `)', then there are some | |
4064 | arguments. */ | |
4065 | if (cp_lexer_next_token_is_not (parser->lexer, | |
4066 | CPP_CLOSE_PAREN)) | |
4067 | args = cp_parser_expression_list (parser); | |
4068 | else | |
4069 | args = NULL_TREE; | |
4070 | /* Look for the closing `)'. */ | |
4071 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
4072 | ||
4073 | if (idk == CP_PARSER_ID_KIND_UNQUALIFIED | |
4074 | && (is_overloaded_fn (postfix_expression) | |
4075 | || DECL_P (postfix_expression) | |
4076 | || TREE_CODE (postfix_expression) == IDENTIFIER_NODE) | |
4077 | && args) | |
4078 | { | |
4079 | tree arg; | |
4080 | tree identifier = NULL_TREE; | |
4081 | tree functions = NULL_TREE; | |
4082 | ||
4083 | /* Find the name of the overloaded function. */ | |
4084 | if (TREE_CODE (postfix_expression) == IDENTIFIER_NODE) | |
4085 | identifier = postfix_expression; | |
4086 | else if (is_overloaded_fn (postfix_expression)) | |
4087 | { | |
4088 | functions = postfix_expression; | |
4089 | identifier = DECL_NAME (get_first_fn (functions)); | |
4090 | } | |
4091 | else if (DECL_P (postfix_expression)) | |
4092 | { | |
4093 | functions = postfix_expression; | |
4094 | identifier = DECL_NAME (postfix_expression); | |
4095 | } | |
4096 | ||
4097 | /* A call to a namespace-scope function using an | |
4098 | unqualified name. | |
4099 | ||
4100 | Do Koenig lookup -- unless any of the arguments are | |
4101 | type-dependent. */ | |
4102 | for (arg = args; arg; arg = TREE_CHAIN (arg)) | |
4103 | if (cp_parser_type_dependent_expression_p (TREE_VALUE (arg))) | |
4104 | break; | |
4105 | if (!arg) | |
4106 | { | |
4107 | postfix_expression | |
4108 | = lookup_arg_dependent(identifier, functions, args); | |
4109 | if (!postfix_expression) | |
4110 | { | |
4111 | /* The unqualified name could not be resolved. */ | |
4112 | unqualified_name_lookup_error (identifier); | |
4113 | postfix_expression = error_mark_node; | |
4114 | } | |
4115 | postfix_expression | |
4116 | = build_call_from_tree (postfix_expression, args, | |
4117 | /*diallow_virtual=*/false); | |
4118 | break; | |
4119 | } | |
4120 | postfix_expression = build_min_nt (LOOKUP_EXPR, | |
4121 | identifier); | |
4122 | } | |
4123 | else if (idk == CP_PARSER_ID_KIND_UNQUALIFIED | |
4124 | && TREE_CODE (postfix_expression) == IDENTIFIER_NODE) | |
4125 | { | |
4126 | /* The unqualified name could not be resolved. */ | |
4127 | unqualified_name_lookup_error (postfix_expression); | |
4128 | postfix_expression = error_mark_node; | |
4129 | break; | |
4130 | } | |
4131 | ||
4132 | /* In the body of a template, no further processing is | |
4133 | required. */ | |
4134 | if (processing_template_decl) | |
4135 | { | |
4136 | postfix_expression = build_nt (CALL_EXPR, | |
4137 | postfix_expression, | |
4138 | args); | |
4139 | break; | |
4140 | } | |
4141 | ||
4142 | if (TREE_CODE (postfix_expression) == COMPONENT_REF) | |
4143 | postfix_expression | |
4144 | = (build_new_method_call | |
4145 | (TREE_OPERAND (postfix_expression, 0), | |
4146 | TREE_OPERAND (postfix_expression, 1), | |
4147 | args, NULL_TREE, | |
4148 | (idk == CP_PARSER_ID_KIND_QUALIFIED | |
4149 | ? LOOKUP_NONVIRTUAL : LOOKUP_NORMAL))); | |
4150 | else if (TREE_CODE (postfix_expression) == OFFSET_REF) | |
4151 | postfix_expression = (build_offset_ref_call_from_tree | |
4152 | (postfix_expression, args)); | |
4153 | else if (idk == CP_PARSER_ID_KIND_QUALIFIED) | |
4154 | { | |
4155 | /* A call to a static class member, or a | |
4156 | namespace-scope function. */ | |
4157 | postfix_expression | |
4158 | = finish_call_expr (postfix_expression, args, | |
4159 | /*disallow_virtual=*/true); | |
4160 | } | |
4161 | else | |
4162 | { | |
4163 | /* All other function calls. */ | |
4164 | postfix_expression | |
4165 | = finish_call_expr (postfix_expression, args, | |
4166 | /*disallow_virtual=*/false); | |
4167 | } | |
4168 | ||
4169 | /* The POSTFIX_EXPRESSION is certainly no longer an id. */ | |
4170 | idk = CP_PARSER_ID_KIND_NONE; | |
4171 | } | |
4172 | break; | |
4173 | ||
4174 | case CPP_DOT: | |
4175 | case CPP_DEREF: | |
4176 | /* postfix-expression . template [opt] id-expression | |
4177 | postfix-expression . pseudo-destructor-name | |
4178 | postfix-expression -> template [opt] id-expression | |
4179 | postfix-expression -> pseudo-destructor-name */ | |
4180 | { | |
4181 | tree name; | |
4182 | bool dependent_p; | |
4183 | bool template_p; | |
4184 | tree scope = NULL_TREE; | |
4185 | ||
4186 | /* If this is a `->' operator, dereference the pointer. */ | |
4187 | if (token->type == CPP_DEREF) | |
4188 | postfix_expression = build_x_arrow (postfix_expression); | |
4189 | /* Check to see whether or not the expression is | |
4190 | type-dependent. */ | |
4191 | dependent_p = (cp_parser_type_dependent_expression_p | |
4192 | (postfix_expression)); | |
4193 | /* The identifier following the `->' or `.' is not | |
4194 | qualified. */ | |
4195 | parser->scope = NULL_TREE; | |
4196 | parser->qualifying_scope = NULL_TREE; | |
4197 | parser->object_scope = NULL_TREE; | |
4198 | /* Enter the scope corresponding to the type of the object | |
4199 | given by the POSTFIX_EXPRESSION. */ | |
4200 | if (!dependent_p | |
4201 | && TREE_TYPE (postfix_expression) != NULL_TREE) | |
4202 | { | |
4203 | scope = TREE_TYPE (postfix_expression); | |
4204 | /* According to the standard, no expression should | |
4205 | ever have reference type. Unfortunately, we do not | |
4206 | currently match the standard in this respect in | |
4207 | that our internal representation of an expression | |
4208 | may have reference type even when the standard says | |
4209 | it does not. Therefore, we have to manually obtain | |
4210 | the underlying type here. */ | |
4211 | if (TREE_CODE (scope) == REFERENCE_TYPE) | |
4212 | scope = TREE_TYPE (scope); | |
4213 | /* If the SCOPE is an OFFSET_TYPE, then we grab the | |
4214 | type of the field. We get an OFFSET_TYPE for | |
4215 | something like: | |
4216 | ||
4217 | S::T.a ... | |
4218 | ||
4219 | Probably, we should not get an OFFSET_TYPE here; | |
4220 | that transformation should be made only if `&S::T' | |
4221 | is written. */ | |
4222 | if (TREE_CODE (scope) == OFFSET_TYPE) | |
4223 | scope = TREE_TYPE (scope); | |
4224 | /* The type of the POSTFIX_EXPRESSION must be | |
4225 | complete. */ | |
4226 | scope = complete_type_or_else (scope, NULL_TREE); | |
4227 | /* Let the name lookup machinery know that we are | |
4228 | processing a class member access expression. */ | |
4229 | parser->context->object_type = scope; | |
4230 | /* If something went wrong, we want to be able to | |
4231 | discern that case, as opposed to the case where | |
4232 | there was no SCOPE due to the type of expression | |
4233 | being dependent. */ | |
4234 | if (!scope) | |
4235 | scope = error_mark_node; | |
4236 | } | |
4237 | ||
4238 | /* Consume the `.' or `->' operator. */ | |
4239 | cp_lexer_consume_token (parser->lexer); | |
4240 | /* If the SCOPE is not a scalar type, we are looking at an | |
4241 | ordinary class member access expression, rather than a | |
4242 | pseudo-destructor-name. */ | |
4243 | if (!scope || !SCALAR_TYPE_P (scope)) | |
4244 | { | |
4245 | template_p = cp_parser_optional_template_keyword (parser); | |
4246 | /* Parse the id-expression. */ | |
4247 | name = cp_parser_id_expression (parser, | |
4248 | template_p, | |
4249 | /*check_dependency_p=*/true, | |
4250 | /*template_p=*/NULL); | |
4251 | /* In general, build a SCOPE_REF if the member name is | |
4252 | qualified. However, if the name was not dependent | |
4253 | and has already been resolved; there is no need to | |
4254 | build the SCOPE_REF. For example; | |
4255 | ||
4256 | struct X { void f(); }; | |
4257 | template <typename T> void f(T* t) { t->X::f(); } | |
4258 | ||
4259 | Even though "t" is dependent, "X::f" is not and has | |
4260 | except that for a BASELINK there is no need to | |
4261 | include scope information. */ | |
4262 | if (name != error_mark_node | |
4263 | && !BASELINK_P (name) | |
4264 | && parser->scope) | |
4265 | { | |
4266 | name = build_nt (SCOPE_REF, parser->scope, name); | |
4267 | parser->scope = NULL_TREE; | |
4268 | parser->qualifying_scope = NULL_TREE; | |
4269 | parser->object_scope = NULL_TREE; | |
4270 | } | |
4271 | postfix_expression | |
4272 | = finish_class_member_access_expr (postfix_expression, name); | |
4273 | } | |
4274 | /* Otherwise, try the pseudo-destructor-name production. */ | |
4275 | else | |
4276 | { | |
4277 | tree s; | |
4278 | tree type; | |
4279 | ||
4280 | /* Parse the pseudo-destructor-name. */ | |
4281 | cp_parser_pseudo_destructor_name (parser, &s, &type); | |
4282 | /* Form the call. */ | |
4283 | postfix_expression | |
4284 | = finish_pseudo_destructor_expr (postfix_expression, | |
4285 | s, TREE_TYPE (type)); | |
4286 | } | |
4287 | ||
4288 | /* We no longer need to look up names in the scope of the | |
4289 | object on the left-hand side of the `.' or `->' | |
4290 | operator. */ | |
4291 | parser->context->object_type = NULL_TREE; | |
4292 | idk = CP_PARSER_ID_KIND_NONE; | |
4293 | } | |
4294 | break; | |
4295 | ||
4296 | case CPP_PLUS_PLUS: | |
4297 | /* postfix-expression ++ */ | |
4298 | /* Consume the `++' token. */ | |
4299 | cp_lexer_consume_token (parser->lexer); | |
4300 | /* Generate a reprsentation for the complete expression. */ | |
4301 | postfix_expression | |
4302 | = finish_increment_expr (postfix_expression, | |
4303 | POSTINCREMENT_EXPR); | |
4304 | idk = CP_PARSER_ID_KIND_NONE; | |
4305 | break; | |
4306 | ||
4307 | case CPP_MINUS_MINUS: | |
4308 | /* postfix-expression -- */ | |
4309 | /* Consume the `--' token. */ | |
4310 | cp_lexer_consume_token (parser->lexer); | |
4311 | /* Generate a reprsentation for the complete expression. */ | |
4312 | postfix_expression | |
4313 | = finish_increment_expr (postfix_expression, | |
4314 | POSTDECREMENT_EXPR); | |
4315 | idk = CP_PARSER_ID_KIND_NONE; | |
4316 | break; | |
4317 | ||
4318 | default: | |
4319 | return postfix_expression; | |
4320 | } | |
4321 | } | |
4322 | ||
4323 | /* We should never get here. */ | |
4324 | abort (); | |
4325 | return error_mark_node; | |
4326 | } | |
4327 | ||
4328 | /* Parse an expression-list. | |
4329 | ||
4330 | expression-list: | |
4331 | assignment-expression | |
4332 | expression-list, assignment-expression | |
4333 | ||
4334 | Returns a TREE_LIST. The TREE_VALUE of each node is a | |
4335 | representation of an assignment-expression. Note that a TREE_LIST | |
4336 | is returned even if there is only a single expression in the list. */ | |
4337 | ||
4338 | static tree | |
4339 | cp_parser_expression_list (parser) | |
4340 | cp_parser *parser; | |
4341 | { | |
4342 | tree expression_list = NULL_TREE; | |
4343 | ||
4344 | /* Consume expressions until there are no more. */ | |
4345 | while (true) | |
4346 | { | |
4347 | tree expr; | |
4348 | ||
4349 | /* Parse the next assignment-expression. */ | |
4350 | expr = cp_parser_assignment_expression (parser); | |
4351 | /* Add it to the list. */ | |
4352 | expression_list = tree_cons (NULL_TREE, expr, expression_list); | |
4353 | ||
4354 | /* If the next token isn't a `,', then we are done. */ | |
4355 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
4356 | { | |
4357 | /* All uses of expression-list in the grammar are followed | |
4358 | by a `)'. Therefore, if the next token is not a `)' an | |
4359 | error will be issued, unless we are parsing tentatively. | |
4360 | Skip ahead to see if there is another `,' before the `)'; | |
4361 | if so, we can go there and recover. */ | |
4362 | if (cp_parser_parsing_tentatively (parser) | |
4363 | || cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_PAREN) | |
4364 | || !cp_parser_skip_to_closing_parenthesis_or_comma (parser)) | |
4365 | break; | |
4366 | } | |
4367 | ||
4368 | /* Otherwise, consume the `,' and keep going. */ | |
4369 | cp_lexer_consume_token (parser->lexer); | |
4370 | } | |
4371 | ||
4372 | /* We built up the list in reverse order so we must reverse it now. */ | |
4373 | return nreverse (expression_list); | |
4374 | } | |
4375 | ||
4376 | /* Parse a pseudo-destructor-name. | |
4377 | ||
4378 | pseudo-destructor-name: | |
4379 | :: [opt] nested-name-specifier [opt] type-name :: ~ type-name | |
4380 | :: [opt] nested-name-specifier template template-id :: ~ type-name | |
4381 | :: [opt] nested-name-specifier [opt] ~ type-name | |
4382 | ||
4383 | If either of the first two productions is used, sets *SCOPE to the | |
4384 | TYPE specified before the final `::'. Otherwise, *SCOPE is set to | |
4385 | NULL_TREE. *TYPE is set to the TYPE_DECL for the final type-name, | |
4386 | or ERROR_MARK_NODE if no type-name is present. */ | |
4387 | ||
4388 | static void | |
4389 | cp_parser_pseudo_destructor_name (parser, scope, type) | |
4390 | cp_parser *parser; | |
4391 | tree *scope; | |
4392 | tree *type; | |
4393 | { | |
4394 | bool nested_name_specifier_p; | |
4395 | ||
4396 | /* Look for the optional `::' operator. */ | |
4397 | cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/true); | |
4398 | /* Look for the optional nested-name-specifier. */ | |
4399 | nested_name_specifier_p | |
4400 | = (cp_parser_nested_name_specifier_opt (parser, | |
4401 | /*typename_keyword_p=*/false, | |
4402 | /*check_dependency_p=*/true, | |
4403 | /*type_p=*/false) | |
4404 | != NULL_TREE); | |
4405 | /* Now, if we saw a nested-name-specifier, we might be doing the | |
4406 | second production. */ | |
4407 | if (nested_name_specifier_p | |
4408 | && cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
4409 | { | |
4410 | /* Consume the `template' keyword. */ | |
4411 | cp_lexer_consume_token (parser->lexer); | |
4412 | /* Parse the template-id. */ | |
4413 | cp_parser_template_id (parser, | |
4414 | /*template_keyword_p=*/true, | |
4415 | /*check_dependency_p=*/false); | |
4416 | /* Look for the `::' token. */ | |
4417 | cp_parser_require (parser, CPP_SCOPE, "`::'"); | |
4418 | } | |
4419 | /* If the next token is not a `~', then there might be some | |
4420 | additional qualification. */ | |
4421 | else if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMPL)) | |
4422 | { | |
4423 | /* Look for the type-name. */ | |
4424 | *scope = TREE_TYPE (cp_parser_type_name (parser)); | |
4425 | /* Look for the `::' token. */ | |
4426 | cp_parser_require (parser, CPP_SCOPE, "`::'"); | |
4427 | } | |
4428 | else | |
4429 | *scope = NULL_TREE; | |
4430 | ||
4431 | /* Look for the `~'. */ | |
4432 | cp_parser_require (parser, CPP_COMPL, "`~'"); | |
4433 | /* Look for the type-name again. We are not responsible for | |
4434 | checking that it matches the first type-name. */ | |
4435 | *type = cp_parser_type_name (parser); | |
4436 | } | |
4437 | ||
4438 | /* Parse a unary-expression. | |
4439 | ||
4440 | unary-expression: | |
4441 | postfix-expression | |
4442 | ++ cast-expression | |
4443 | -- cast-expression | |
4444 | unary-operator cast-expression | |
4445 | sizeof unary-expression | |
4446 | sizeof ( type-id ) | |
4447 | new-expression | |
4448 | delete-expression | |
4449 | ||
4450 | GNU Extensions: | |
4451 | ||
4452 | unary-expression: | |
4453 | __extension__ cast-expression | |
4454 | __alignof__ unary-expression | |
4455 | __alignof__ ( type-id ) | |
4456 | __real__ cast-expression | |
4457 | __imag__ cast-expression | |
4458 | && identifier | |
4459 | ||
4460 | ADDRESS_P is true iff the unary-expression is appearing as the | |
4461 | operand of the `&' operator. | |
4462 | ||
4463 | Returns a representation of the expresion. */ | |
4464 | ||
4465 | static tree | |
4466 | cp_parser_unary_expression (cp_parser *parser, bool address_p) | |
4467 | { | |
4468 | cp_token *token; | |
4469 | enum tree_code unary_operator; | |
4470 | ||
4471 | /* Peek at the next token. */ | |
4472 | token = cp_lexer_peek_token (parser->lexer); | |
4473 | /* Some keywords give away the kind of expression. */ | |
4474 | if (token->type == CPP_KEYWORD) | |
4475 | { | |
4476 | enum rid keyword = token->keyword; | |
4477 | ||
4478 | switch (keyword) | |
4479 | { | |
4480 | case RID_ALIGNOF: | |
4481 | { | |
4482 | /* Consume the `alignof' token. */ | |
4483 | cp_lexer_consume_token (parser->lexer); | |
4484 | /* Parse the operand. */ | |
4485 | return finish_alignof (cp_parser_sizeof_operand | |
4486 | (parser, keyword)); | |
4487 | } | |
4488 | ||
4489 | case RID_SIZEOF: | |
4490 | { | |
4491 | tree operand; | |
4492 | ||
4493 | /* Consume the `sizeof' token. */ | |
4494 | cp_lexer_consume_token (parser->lexer); | |
4495 | /* Parse the operand. */ | |
4496 | operand = cp_parser_sizeof_operand (parser, keyword); | |
4497 | ||
4498 | /* If the type of the operand cannot be determined build a | |
4499 | SIZEOF_EXPR. */ | |
4500 | if (TYPE_P (operand) | |
4501 | ? cp_parser_dependent_type_p (operand) | |
4502 | : cp_parser_type_dependent_expression_p (operand)) | |
4503 | return build_min (SIZEOF_EXPR, size_type_node, operand); | |
4504 | /* Otherwise, compute the constant value. */ | |
4505 | else | |
4506 | return finish_sizeof (operand); | |
4507 | } | |
4508 | ||
4509 | case RID_NEW: | |
4510 | return cp_parser_new_expression (parser); | |
4511 | ||
4512 | case RID_DELETE: | |
4513 | return cp_parser_delete_expression (parser); | |
4514 | ||
4515 | case RID_EXTENSION: | |
4516 | { | |
4517 | /* The saved value of the PEDANTIC flag. */ | |
4518 | int saved_pedantic; | |
4519 | tree expr; | |
4520 | ||
4521 | /* Save away the PEDANTIC flag. */ | |
4522 | cp_parser_extension_opt (parser, &saved_pedantic); | |
4523 | /* Parse the cast-expression. */ | |
4524 | expr = cp_parser_cast_expression (parser, /*address_p=*/false); | |
4525 | /* Restore the PEDANTIC flag. */ | |
4526 | pedantic = saved_pedantic; | |
4527 | ||
4528 | return expr; | |
4529 | } | |
4530 | ||
4531 | case RID_REALPART: | |
4532 | case RID_IMAGPART: | |
4533 | { | |
4534 | tree expression; | |
4535 | ||
4536 | /* Consume the `__real__' or `__imag__' token. */ | |
4537 | cp_lexer_consume_token (parser->lexer); | |
4538 | /* Parse the cast-expression. */ | |
4539 | expression = cp_parser_cast_expression (parser, | |
4540 | /*address_p=*/false); | |
4541 | /* Create the complete representation. */ | |
4542 | return build_x_unary_op ((keyword == RID_REALPART | |
4543 | ? REALPART_EXPR : IMAGPART_EXPR), | |
4544 | expression); | |
4545 | } | |
4546 | break; | |
4547 | ||
4548 | default: | |
4549 | break; | |
4550 | } | |
4551 | } | |
4552 | ||
4553 | /* Look for the `:: new' and `:: delete', which also signal the | |
4554 | beginning of a new-expression, or delete-expression, | |
4555 | respectively. If the next token is `::', then it might be one of | |
4556 | these. */ | |
4557 | if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
4558 | { | |
4559 | enum rid keyword; | |
4560 | ||
4561 | /* See if the token after the `::' is one of the keywords in | |
4562 | which we're interested. */ | |
4563 | keyword = cp_lexer_peek_nth_token (parser->lexer, 2)->keyword; | |
4564 | /* If it's `new', we have a new-expression. */ | |
4565 | if (keyword == RID_NEW) | |
4566 | return cp_parser_new_expression (parser); | |
4567 | /* Similarly, for `delete'. */ | |
4568 | else if (keyword == RID_DELETE) | |
4569 | return cp_parser_delete_expression (parser); | |
4570 | } | |
4571 | ||
4572 | /* Look for a unary operator. */ | |
4573 | unary_operator = cp_parser_unary_operator (token); | |
4574 | /* The `++' and `--' operators can be handled similarly, even though | |
4575 | they are not technically unary-operators in the grammar. */ | |
4576 | if (unary_operator == ERROR_MARK) | |
4577 | { | |
4578 | if (token->type == CPP_PLUS_PLUS) | |
4579 | unary_operator = PREINCREMENT_EXPR; | |
4580 | else if (token->type == CPP_MINUS_MINUS) | |
4581 | unary_operator = PREDECREMENT_EXPR; | |
4582 | /* Handle the GNU address-of-label extension. */ | |
4583 | else if (cp_parser_allow_gnu_extensions_p (parser) | |
4584 | && token->type == CPP_AND_AND) | |
4585 | { | |
4586 | tree identifier; | |
4587 | ||
4588 | /* Consume the '&&' token. */ | |
4589 | cp_lexer_consume_token (parser->lexer); | |
4590 | /* Look for the identifier. */ | |
4591 | identifier = cp_parser_identifier (parser); | |
4592 | /* Create an expression representing the address. */ | |
4593 | return finish_label_address_expr (identifier); | |
4594 | } | |
4595 | } | |
4596 | if (unary_operator != ERROR_MARK) | |
4597 | { | |
4598 | tree cast_expression; | |
4599 | ||
4600 | /* Consume the operator token. */ | |
4601 | token = cp_lexer_consume_token (parser->lexer); | |
4602 | /* Parse the cast-expression. */ | |
4603 | cast_expression | |
4604 | = cp_parser_cast_expression (parser, unary_operator == ADDR_EXPR); | |
4605 | /* Now, build an appropriate representation. */ | |
4606 | switch (unary_operator) | |
4607 | { | |
4608 | case INDIRECT_REF: | |
4609 | return build_x_indirect_ref (cast_expression, "unary *"); | |
4610 | ||
4611 | case ADDR_EXPR: | |
4612 | return build_x_unary_op (ADDR_EXPR, cast_expression); | |
4613 | ||
4614 | case CONVERT_EXPR: | |
4615 | case NEGATE_EXPR: | |
4616 | case TRUTH_NOT_EXPR: | |
4617 | case PREINCREMENT_EXPR: | |
4618 | case PREDECREMENT_EXPR: | |
4619 | return finish_unary_op_expr (unary_operator, cast_expression); | |
4620 | ||
4621 | case BIT_NOT_EXPR: | |
4622 | return build_x_unary_op (BIT_NOT_EXPR, cast_expression); | |
4623 | ||
4624 | default: | |
4625 | abort (); | |
4626 | return error_mark_node; | |
4627 | } | |
4628 | } | |
4629 | ||
4630 | return cp_parser_postfix_expression (parser, address_p); | |
4631 | } | |
4632 | ||
4633 | /* Returns ERROR_MARK if TOKEN is not a unary-operator. If TOKEN is a | |
4634 | unary-operator, the corresponding tree code is returned. */ | |
4635 | ||
4636 | static enum tree_code | |
4637 | cp_parser_unary_operator (token) | |
4638 | cp_token *token; | |
4639 | { | |
4640 | switch (token->type) | |
4641 | { | |
4642 | case CPP_MULT: | |
4643 | return INDIRECT_REF; | |
4644 | ||
4645 | case CPP_AND: | |
4646 | return ADDR_EXPR; | |
4647 | ||
4648 | case CPP_PLUS: | |
4649 | return CONVERT_EXPR; | |
4650 | ||
4651 | case CPP_MINUS: | |
4652 | return NEGATE_EXPR; | |
4653 | ||
4654 | case CPP_NOT: | |
4655 | return TRUTH_NOT_EXPR; | |
4656 | ||
4657 | case CPP_COMPL: | |
4658 | return BIT_NOT_EXPR; | |
4659 | ||
4660 | default: | |
4661 | return ERROR_MARK; | |
4662 | } | |
4663 | } | |
4664 | ||
4665 | /* Parse a new-expression. | |
4666 | ||
4667 | :: [opt] new new-placement [opt] new-type-id new-initializer [opt] | |
4668 | :: [opt] new new-placement [opt] ( type-id ) new-initializer [opt] | |
4669 | ||
4670 | Returns a representation of the expression. */ | |
4671 | ||
4672 | static tree | |
4673 | cp_parser_new_expression (parser) | |
4674 | cp_parser *parser; | |
4675 | { | |
4676 | bool global_scope_p; | |
4677 | tree placement; | |
4678 | tree type; | |
4679 | tree initializer; | |
4680 | ||
4681 | /* Look for the optional `::' operator. */ | |
4682 | global_scope_p | |
4683 | = (cp_parser_global_scope_opt (parser, | |
4684 | /*current_scope_valid_p=*/false) | |
4685 | != NULL_TREE); | |
4686 | /* Look for the `new' operator. */ | |
4687 | cp_parser_require_keyword (parser, RID_NEW, "`new'"); | |
4688 | /* There's no easy way to tell a new-placement from the | |
4689 | `( type-id )' construct. */ | |
4690 | cp_parser_parse_tentatively (parser); | |
4691 | /* Look for a new-placement. */ | |
4692 | placement = cp_parser_new_placement (parser); | |
4693 | /* If that didn't work out, there's no new-placement. */ | |
4694 | if (!cp_parser_parse_definitely (parser)) | |
4695 | placement = NULL_TREE; | |
4696 | ||
4697 | /* If the next token is a `(', then we have a parenthesized | |
4698 | type-id. */ | |
4699 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
4700 | { | |
4701 | /* Consume the `('. */ | |
4702 | cp_lexer_consume_token (parser->lexer); | |
4703 | /* Parse the type-id. */ | |
4704 | type = cp_parser_type_id (parser); | |
4705 | /* Look for the closing `)'. */ | |
4706 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
4707 | } | |
4708 | /* Otherwise, there must be a new-type-id. */ | |
4709 | else | |
4710 | type = cp_parser_new_type_id (parser); | |
4711 | ||
4712 | /* If the next token is a `(', then we have a new-initializer. */ | |
4713 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
4714 | initializer = cp_parser_new_initializer (parser); | |
4715 | else | |
4716 | initializer = NULL_TREE; | |
4717 | ||
4718 | /* Create a representation of the new-expression. */ | |
4719 | return build_new (placement, type, initializer, global_scope_p); | |
4720 | } | |
4721 | ||
4722 | /* Parse a new-placement. | |
4723 | ||
4724 | new-placement: | |
4725 | ( expression-list ) | |
4726 | ||
4727 | Returns the same representation as for an expression-list. */ | |
4728 | ||
4729 | static tree | |
4730 | cp_parser_new_placement (parser) | |
4731 | cp_parser *parser; | |
4732 | { | |
4733 | tree expression_list; | |
4734 | ||
4735 | /* Look for the opening `('. */ | |
4736 | if (!cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) | |
4737 | return error_mark_node; | |
4738 | /* Parse the expression-list. */ | |
4739 | expression_list = cp_parser_expression_list (parser); | |
4740 | /* Look for the closing `)'. */ | |
4741 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
4742 | ||
4743 | return expression_list; | |
4744 | } | |
4745 | ||
4746 | /* Parse a new-type-id. | |
4747 | ||
4748 | new-type-id: | |
4749 | type-specifier-seq new-declarator [opt] | |
4750 | ||
4751 | Returns a TREE_LIST whose TREE_PURPOSE is the type-specifier-seq, | |
4752 | and whose TREE_VALUE is the new-declarator. */ | |
4753 | ||
4754 | static tree | |
4755 | cp_parser_new_type_id (parser) | |
4756 | cp_parser *parser; | |
4757 | { | |
4758 | tree type_specifier_seq; | |
4759 | tree declarator; | |
4760 | const char *saved_message; | |
4761 | ||
4762 | /* The type-specifier sequence must not contain type definitions. | |
4763 | (It cannot contain declarations of new types either, but if they | |
4764 | are not definitions we will catch that because they are not | |
4765 | complete.) */ | |
4766 | saved_message = parser->type_definition_forbidden_message; | |
4767 | parser->type_definition_forbidden_message | |
4768 | = "types may not be defined in a new-type-id"; | |
4769 | /* Parse the type-specifier-seq. */ | |
4770 | type_specifier_seq = cp_parser_type_specifier_seq (parser); | |
4771 | /* Restore the old message. */ | |
4772 | parser->type_definition_forbidden_message = saved_message; | |
4773 | /* Parse the new-declarator. */ | |
4774 | declarator = cp_parser_new_declarator_opt (parser); | |
4775 | ||
4776 | return build_tree_list (type_specifier_seq, declarator); | |
4777 | } | |
4778 | ||
4779 | /* Parse an (optional) new-declarator. | |
4780 | ||
4781 | new-declarator: | |
4782 | ptr-operator new-declarator [opt] | |
4783 | direct-new-declarator | |
4784 | ||
4785 | Returns a representation of the declarator. See | |
4786 | cp_parser_declarator for the representations used. */ | |
4787 | ||
4788 | static tree | |
4789 | cp_parser_new_declarator_opt (parser) | |
4790 | cp_parser *parser; | |
4791 | { | |
4792 | enum tree_code code; | |
4793 | tree type; | |
4794 | tree cv_qualifier_seq; | |
4795 | ||
4796 | /* We don't know if there's a ptr-operator next, or not. */ | |
4797 | cp_parser_parse_tentatively (parser); | |
4798 | /* Look for a ptr-operator. */ | |
4799 | code = cp_parser_ptr_operator (parser, &type, &cv_qualifier_seq); | |
4800 | /* If that worked, look for more new-declarators. */ | |
4801 | if (cp_parser_parse_definitely (parser)) | |
4802 | { | |
4803 | tree declarator; | |
4804 | ||
4805 | /* Parse another optional declarator. */ | |
4806 | declarator = cp_parser_new_declarator_opt (parser); | |
4807 | ||
4808 | /* Create the representation of the declarator. */ | |
4809 | if (code == INDIRECT_REF) | |
4810 | declarator = make_pointer_declarator (cv_qualifier_seq, | |
4811 | declarator); | |
4812 | else | |
4813 | declarator = make_reference_declarator (cv_qualifier_seq, | |
4814 | declarator); | |
4815 | ||
4816 | /* Handle the pointer-to-member case. */ | |
4817 | if (type) | |
4818 | declarator = build_nt (SCOPE_REF, type, declarator); | |
4819 | ||
4820 | return declarator; | |
4821 | } | |
4822 | ||
4823 | /* If the next token is a `[', there is a direct-new-declarator. */ | |
4824 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE)) | |
4825 | return cp_parser_direct_new_declarator (parser); | |
4826 | ||
4827 | return NULL_TREE; | |
4828 | } | |
4829 | ||
4830 | /* Parse a direct-new-declarator. | |
4831 | ||
4832 | direct-new-declarator: | |
4833 | [ expression ] | |
4834 | direct-new-declarator [constant-expression] | |
4835 | ||
4836 | Returns an ARRAY_REF, following the same conventions as are | |
4837 | documented for cp_parser_direct_declarator. */ | |
4838 | ||
4839 | static tree | |
4840 | cp_parser_direct_new_declarator (parser) | |
4841 | cp_parser *parser; | |
4842 | { | |
4843 | tree declarator = NULL_TREE; | |
4844 | ||
4845 | while (true) | |
4846 | { | |
4847 | tree expression; | |
4848 | ||
4849 | /* Look for the opening `['. */ | |
4850 | cp_parser_require (parser, CPP_OPEN_SQUARE, "`['"); | |
4851 | /* The first expression is not required to be constant. */ | |
4852 | if (!declarator) | |
4853 | { | |
4854 | expression = cp_parser_expression (parser); | |
4855 | /* The standard requires that the expression have integral | |
4856 | type. DR 74 adds enumeration types. We believe that the | |
4857 | real intent is that these expressions be handled like the | |
4858 | expression in a `switch' condition, which also allows | |
4859 | classes with a single conversion to integral or | |
4860 | enumeration type. */ | |
4861 | if (!processing_template_decl) | |
4862 | { | |
4863 | expression | |
4864 | = build_expr_type_conversion (WANT_INT | WANT_ENUM, | |
4865 | expression, | |
b746c5dc | 4866 | /*complain=*/true); |
a723baf1 MM |
4867 | if (!expression) |
4868 | { | |
4869 | error ("expression in new-declarator must have integral or enumeration type"); | |
4870 | expression = error_mark_node; | |
4871 | } | |
4872 | } | |
4873 | } | |
4874 | /* But all the other expressions must be. */ | |
4875 | else | |
4876 | expression = cp_parser_constant_expression (parser); | |
4877 | /* Look for the closing `]'. */ | |
4878 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
4879 | ||
4880 | /* Add this bound to the declarator. */ | |
4881 | declarator = build_nt (ARRAY_REF, declarator, expression); | |
4882 | ||
4883 | /* If the next token is not a `[', then there are no more | |
4884 | bounds. */ | |
4885 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_SQUARE)) | |
4886 | break; | |
4887 | } | |
4888 | ||
4889 | return declarator; | |
4890 | } | |
4891 | ||
4892 | /* Parse a new-initializer. | |
4893 | ||
4894 | new-initializer: | |
4895 | ( expression-list [opt] ) | |
4896 | ||
4897 | Returns a reprsentation of the expression-list. If there is no | |
4898 | expression-list, VOID_ZERO_NODE is returned. */ | |
4899 | ||
4900 | static tree | |
4901 | cp_parser_new_initializer (parser) | |
4902 | cp_parser *parser; | |
4903 | { | |
4904 | tree expression_list; | |
4905 | ||
4906 | /* Look for the opening parenthesis. */ | |
4907 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
4908 | /* If the next token is not a `)', then there is an | |
4909 | expression-list. */ | |
4910 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_PAREN)) | |
4911 | expression_list = cp_parser_expression_list (parser); | |
4912 | else | |
4913 | expression_list = void_zero_node; | |
4914 | /* Look for the closing parenthesis. */ | |
4915 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
4916 | ||
4917 | return expression_list; | |
4918 | } | |
4919 | ||
4920 | /* Parse a delete-expression. | |
4921 | ||
4922 | delete-expression: | |
4923 | :: [opt] delete cast-expression | |
4924 | :: [opt] delete [ ] cast-expression | |
4925 | ||
4926 | Returns a representation of the expression. */ | |
4927 | ||
4928 | static tree | |
4929 | cp_parser_delete_expression (parser) | |
4930 | cp_parser *parser; | |
4931 | { | |
4932 | bool global_scope_p; | |
4933 | bool array_p; | |
4934 | tree expression; | |
4935 | ||
4936 | /* Look for the optional `::' operator. */ | |
4937 | global_scope_p | |
4938 | = (cp_parser_global_scope_opt (parser, | |
4939 | /*current_scope_valid_p=*/false) | |
4940 | != NULL_TREE); | |
4941 | /* Look for the `delete' keyword. */ | |
4942 | cp_parser_require_keyword (parser, RID_DELETE, "`delete'"); | |
4943 | /* See if the array syntax is in use. */ | |
4944 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE)) | |
4945 | { | |
4946 | /* Consume the `[' token. */ | |
4947 | cp_lexer_consume_token (parser->lexer); | |
4948 | /* Look for the `]' token. */ | |
4949 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
4950 | /* Remember that this is the `[]' construct. */ | |
4951 | array_p = true; | |
4952 | } | |
4953 | else | |
4954 | array_p = false; | |
4955 | ||
4956 | /* Parse the cast-expression. */ | |
4957 | expression = cp_parser_cast_expression (parser, /*address_p=*/false); | |
4958 | ||
4959 | return delete_sanity (expression, NULL_TREE, array_p, global_scope_p); | |
4960 | } | |
4961 | ||
4962 | /* Parse a cast-expression. | |
4963 | ||
4964 | cast-expression: | |
4965 | unary-expression | |
4966 | ( type-id ) cast-expression | |
4967 | ||
4968 | Returns a representation of the expression. */ | |
4969 | ||
4970 | static tree | |
4971 | cp_parser_cast_expression (cp_parser *parser, bool address_p) | |
4972 | { | |
4973 | /* If it's a `(', then we might be looking at a cast. */ | |
4974 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
4975 | { | |
4976 | tree type = NULL_TREE; | |
4977 | tree expr = NULL_TREE; | |
4978 | bool compound_literal_p; | |
4979 | const char *saved_message; | |
4980 | ||
4981 | /* There's no way to know yet whether or not this is a cast. | |
4982 | For example, `(int (3))' is a unary-expression, while `(int) | |
4983 | 3' is a cast. So, we resort to parsing tentatively. */ | |
4984 | cp_parser_parse_tentatively (parser); | |
4985 | /* Types may not be defined in a cast. */ | |
4986 | saved_message = parser->type_definition_forbidden_message; | |
4987 | parser->type_definition_forbidden_message | |
4988 | = "types may not be defined in casts"; | |
4989 | /* Consume the `('. */ | |
4990 | cp_lexer_consume_token (parser->lexer); | |
4991 | /* A very tricky bit is that `(struct S) { 3 }' is a | |
4992 | compound-literal (which we permit in C++ as an extension). | |
4993 | But, that construct is not a cast-expression -- it is a | |
4994 | postfix-expression. (The reason is that `(struct S) { 3 }.i' | |
4995 | is legal; if the compound-literal were a cast-expression, | |
4996 | you'd need an extra set of parentheses.) But, if we parse | |
4997 | the type-id, and it happens to be a class-specifier, then we | |
4998 | will commit to the parse at that point, because we cannot | |
4999 | undo the action that is done when creating a new class. So, | |
5000 | then we cannot back up and do a postfix-expression. | |
5001 | ||
5002 | Therefore, we scan ahead to the closing `)', and check to see | |
5003 | if the token after the `)' is a `{'. If so, we are not | |
5004 | looking at a cast-expression. | |
5005 | ||
5006 | Save tokens so that we can put them back. */ | |
5007 | cp_lexer_save_tokens (parser->lexer); | |
5008 | /* Skip tokens until the next token is a closing parenthesis. | |
5009 | If we find the closing `)', and the next token is a `{', then | |
5010 | we are looking at a compound-literal. */ | |
5011 | compound_literal_p | |
5012 | = (cp_parser_skip_to_closing_parenthesis (parser) | |
5013 | && cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)); | |
5014 | /* Roll back the tokens we skipped. */ | |
5015 | cp_lexer_rollback_tokens (parser->lexer); | |
5016 | /* If we were looking at a compound-literal, simulate an error | |
5017 | so that the call to cp_parser_parse_definitely below will | |
5018 | fail. */ | |
5019 | if (compound_literal_p) | |
5020 | cp_parser_simulate_error (parser); | |
5021 | else | |
5022 | { | |
5023 | /* Look for the type-id. */ | |
5024 | type = cp_parser_type_id (parser); | |
5025 | /* Look for the closing `)'. */ | |
5026 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
5027 | } | |
5028 | ||
5029 | /* Restore the saved message. */ | |
5030 | parser->type_definition_forbidden_message = saved_message; | |
5031 | ||
5032 | /* If all went well, this is a cast. */ | |
5033 | if (cp_parser_parse_definitely (parser)) | |
5034 | { | |
5035 | /* Parse the dependent expression. */ | |
5036 | expr = cp_parser_cast_expression (parser, /*address_p=*/false); | |
5037 | /* Warn about old-style casts, if so requested. */ | |
5038 | if (warn_old_style_cast | |
5039 | && !in_system_header | |
5040 | && !VOID_TYPE_P (type) | |
5041 | && current_lang_name != lang_name_c) | |
5042 | warning ("use of old-style cast"); | |
5043 | /* Perform the cast. */ | |
5044 | expr = build_c_cast (type, expr); | |
5045 | } | |
5046 | ||
5047 | if (expr) | |
5048 | return expr; | |
5049 | } | |
5050 | ||
5051 | /* If we get here, then it's not a cast, so it must be a | |
5052 | unary-expression. */ | |
5053 | return cp_parser_unary_expression (parser, address_p); | |
5054 | } | |
5055 | ||
5056 | /* Parse a pm-expression. | |
5057 | ||
5058 | pm-expression: | |
5059 | cast-expression | |
5060 | pm-expression .* cast-expression | |
5061 | pm-expression ->* cast-expression | |
5062 | ||
5063 | Returns a representation of the expression. */ | |
5064 | ||
5065 | static tree | |
5066 | cp_parser_pm_expression (parser) | |
5067 | cp_parser *parser; | |
5068 | { | |
5069 | tree cast_expr; | |
5070 | tree pm_expr; | |
5071 | ||
5072 | /* Parse the cast-expresion. */ | |
5073 | cast_expr = cp_parser_cast_expression (parser, /*address_p=*/false); | |
5074 | pm_expr = cast_expr; | |
5075 | /* Now look for pointer-to-member operators. */ | |
5076 | while (true) | |
5077 | { | |
5078 | cp_token *token; | |
5079 | enum cpp_ttype token_type; | |
5080 | ||
5081 | /* Peek at the next token. */ | |
5082 | token = cp_lexer_peek_token (parser->lexer); | |
5083 | token_type = token->type; | |
5084 | /* If it's not `.*' or `->*' there's no pointer-to-member | |
5085 | operation. */ | |
5086 | if (token_type != CPP_DOT_STAR | |
5087 | && token_type != CPP_DEREF_STAR) | |
5088 | break; | |
5089 | ||
5090 | /* Consume the token. */ | |
5091 | cp_lexer_consume_token (parser->lexer); | |
5092 | ||
5093 | /* Parse another cast-expression. */ | |
5094 | cast_expr = cp_parser_cast_expression (parser, /*address_p=*/false); | |
5095 | ||
5096 | /* Build the representation of the pointer-to-member | |
5097 | operation. */ | |
5098 | if (token_type == CPP_DEREF_STAR) | |
5099 | pm_expr = build_x_binary_op (MEMBER_REF, pm_expr, cast_expr); | |
5100 | else | |
5101 | pm_expr = build_m_component_ref (pm_expr, cast_expr); | |
5102 | } | |
5103 | ||
5104 | return pm_expr; | |
5105 | } | |
5106 | ||
5107 | /* Parse a multiplicative-expression. | |
5108 | ||
5109 | mulitplicative-expression: | |
5110 | pm-expression | |
5111 | multiplicative-expression * pm-expression | |
5112 | multiplicative-expression / pm-expression | |
5113 | multiplicative-expression % pm-expression | |
5114 | ||
5115 | Returns a representation of the expression. */ | |
5116 | ||
5117 | static tree | |
5118 | cp_parser_multiplicative_expression (parser) | |
5119 | cp_parser *parser; | |
5120 | { | |
5121 | static cp_parser_token_tree_map map = { | |
5122 | { CPP_MULT, MULT_EXPR }, | |
5123 | { CPP_DIV, TRUNC_DIV_EXPR }, | |
5124 | { CPP_MOD, TRUNC_MOD_EXPR }, | |
5125 | { CPP_EOF, ERROR_MARK } | |
5126 | }; | |
5127 | ||
5128 | return cp_parser_binary_expression (parser, | |
5129 | map, | |
5130 | cp_parser_pm_expression); | |
5131 | } | |
5132 | ||
5133 | /* Parse an additive-expression. | |
5134 | ||
5135 | additive-expression: | |
5136 | multiplicative-expression | |
5137 | additive-expression + multiplicative-expression | |
5138 | additive-expression - multiplicative-expression | |
5139 | ||
5140 | Returns a representation of the expression. */ | |
5141 | ||
5142 | static tree | |
5143 | cp_parser_additive_expression (parser) | |
5144 | cp_parser *parser; | |
5145 | { | |
5146 | static cp_parser_token_tree_map map = { | |
5147 | { CPP_PLUS, PLUS_EXPR }, | |
5148 | { CPP_MINUS, MINUS_EXPR }, | |
5149 | { CPP_EOF, ERROR_MARK } | |
5150 | }; | |
5151 | ||
5152 | return cp_parser_binary_expression (parser, | |
5153 | map, | |
5154 | cp_parser_multiplicative_expression); | |
5155 | } | |
5156 | ||
5157 | /* Parse a shift-expression. | |
5158 | ||
5159 | shift-expression: | |
5160 | additive-expression | |
5161 | shift-expression << additive-expression | |
5162 | shift-expression >> additive-expression | |
5163 | ||
5164 | Returns a representation of the expression. */ | |
5165 | ||
5166 | static tree | |
5167 | cp_parser_shift_expression (parser) | |
5168 | cp_parser *parser; | |
5169 | { | |
5170 | static cp_parser_token_tree_map map = { | |
5171 | { CPP_LSHIFT, LSHIFT_EXPR }, | |
5172 | { CPP_RSHIFT, RSHIFT_EXPR }, | |
5173 | { CPP_EOF, ERROR_MARK } | |
5174 | }; | |
5175 | ||
5176 | return cp_parser_binary_expression (parser, | |
5177 | map, | |
5178 | cp_parser_additive_expression); | |
5179 | } | |
5180 | ||
5181 | /* Parse a relational-expression. | |
5182 | ||
5183 | relational-expression: | |
5184 | shift-expression | |
5185 | relational-expression < shift-expression | |
5186 | relational-expression > shift-expression | |
5187 | relational-expression <= shift-expression | |
5188 | relational-expression >= shift-expression | |
5189 | ||
5190 | GNU Extension: | |
5191 | ||
5192 | relational-expression: | |
5193 | relational-expression <? shift-expression | |
5194 | relational-expression >? shift-expression | |
5195 | ||
5196 | Returns a representation of the expression. */ | |
5197 | ||
5198 | static tree | |
5199 | cp_parser_relational_expression (parser) | |
5200 | cp_parser *parser; | |
5201 | { | |
5202 | static cp_parser_token_tree_map map = { | |
5203 | { CPP_LESS, LT_EXPR }, | |
5204 | { CPP_GREATER, GT_EXPR }, | |
5205 | { CPP_LESS_EQ, LE_EXPR }, | |
5206 | { CPP_GREATER_EQ, GE_EXPR }, | |
5207 | { CPP_MIN, MIN_EXPR }, | |
5208 | { CPP_MAX, MAX_EXPR }, | |
5209 | { CPP_EOF, ERROR_MARK } | |
5210 | }; | |
5211 | ||
5212 | return cp_parser_binary_expression (parser, | |
5213 | map, | |
5214 | cp_parser_shift_expression); | |
5215 | } | |
5216 | ||
5217 | /* Parse an equality-expression. | |
5218 | ||
5219 | equality-expression: | |
5220 | relational-expression | |
5221 | equality-expression == relational-expression | |
5222 | equality-expression != relational-expression | |
5223 | ||
5224 | Returns a representation of the expression. */ | |
5225 | ||
5226 | static tree | |
5227 | cp_parser_equality_expression (parser) | |
5228 | cp_parser *parser; | |
5229 | { | |
5230 | static cp_parser_token_tree_map map = { | |
5231 | { CPP_EQ_EQ, EQ_EXPR }, | |
5232 | { CPP_NOT_EQ, NE_EXPR }, | |
5233 | { CPP_EOF, ERROR_MARK } | |
5234 | }; | |
5235 | ||
5236 | return cp_parser_binary_expression (parser, | |
5237 | map, | |
5238 | cp_parser_relational_expression); | |
5239 | } | |
5240 | ||
5241 | /* Parse an and-expression. | |
5242 | ||
5243 | and-expression: | |
5244 | equality-expression | |
5245 | and-expression & equality-expression | |
5246 | ||
5247 | Returns a representation of the expression. */ | |
5248 | ||
5249 | static tree | |
5250 | cp_parser_and_expression (parser) | |
5251 | cp_parser *parser; | |
5252 | { | |
5253 | static cp_parser_token_tree_map map = { | |
5254 | { CPP_AND, BIT_AND_EXPR }, | |
5255 | { CPP_EOF, ERROR_MARK } | |
5256 | }; | |
5257 | ||
5258 | return cp_parser_binary_expression (parser, | |
5259 | map, | |
5260 | cp_parser_equality_expression); | |
5261 | } | |
5262 | ||
5263 | /* Parse an exclusive-or-expression. | |
5264 | ||
5265 | exclusive-or-expression: | |
5266 | and-expression | |
5267 | exclusive-or-expression ^ and-expression | |
5268 | ||
5269 | Returns a representation of the expression. */ | |
5270 | ||
5271 | static tree | |
5272 | cp_parser_exclusive_or_expression (parser) | |
5273 | cp_parser *parser; | |
5274 | { | |
5275 | static cp_parser_token_tree_map map = { | |
5276 | { CPP_XOR, BIT_XOR_EXPR }, | |
5277 | { CPP_EOF, ERROR_MARK } | |
5278 | }; | |
5279 | ||
5280 | return cp_parser_binary_expression (parser, | |
5281 | map, | |
5282 | cp_parser_and_expression); | |
5283 | } | |
5284 | ||
5285 | ||
5286 | /* Parse an inclusive-or-expression. | |
5287 | ||
5288 | inclusive-or-expression: | |
5289 | exclusive-or-expression | |
5290 | inclusive-or-expression | exclusive-or-expression | |
5291 | ||
5292 | Returns a representation of the expression. */ | |
5293 | ||
5294 | static tree | |
5295 | cp_parser_inclusive_or_expression (parser) | |
5296 | cp_parser *parser; | |
5297 | { | |
5298 | static cp_parser_token_tree_map map = { | |
5299 | { CPP_OR, BIT_IOR_EXPR }, | |
5300 | { CPP_EOF, ERROR_MARK } | |
5301 | }; | |
5302 | ||
5303 | return cp_parser_binary_expression (parser, | |
5304 | map, | |
5305 | cp_parser_exclusive_or_expression); | |
5306 | } | |
5307 | ||
5308 | /* Parse a logical-and-expression. | |
5309 | ||
5310 | logical-and-expression: | |
5311 | inclusive-or-expression | |
5312 | logical-and-expression && inclusive-or-expression | |
5313 | ||
5314 | Returns a representation of the expression. */ | |
5315 | ||
5316 | static tree | |
5317 | cp_parser_logical_and_expression (parser) | |
5318 | cp_parser *parser; | |
5319 | { | |
5320 | static cp_parser_token_tree_map map = { | |
5321 | { CPP_AND_AND, TRUTH_ANDIF_EXPR }, | |
5322 | { CPP_EOF, ERROR_MARK } | |
5323 | }; | |
5324 | ||
5325 | return cp_parser_binary_expression (parser, | |
5326 | map, | |
5327 | cp_parser_inclusive_or_expression); | |
5328 | } | |
5329 | ||
5330 | /* Parse a logical-or-expression. | |
5331 | ||
5332 | logical-or-expression: | |
5333 | logical-and-expresion | |
5334 | logical-or-expression || logical-and-expression | |
5335 | ||
5336 | Returns a representation of the expression. */ | |
5337 | ||
5338 | static tree | |
5339 | cp_parser_logical_or_expression (parser) | |
5340 | cp_parser *parser; | |
5341 | { | |
5342 | static cp_parser_token_tree_map map = { | |
5343 | { CPP_OR_OR, TRUTH_ORIF_EXPR }, | |
5344 | { CPP_EOF, ERROR_MARK } | |
5345 | }; | |
5346 | ||
5347 | return cp_parser_binary_expression (parser, | |
5348 | map, | |
5349 | cp_parser_logical_and_expression); | |
5350 | } | |
5351 | ||
5352 | /* Parse a conditional-expression. | |
5353 | ||
5354 | conditional-expression: | |
5355 | logical-or-expression | |
5356 | logical-or-expression ? expression : assignment-expression | |
5357 | ||
5358 | GNU Extensions: | |
5359 | ||
5360 | conditional-expression: | |
5361 | logical-or-expression ? : assignment-expression | |
5362 | ||
5363 | Returns a representation of the expression. */ | |
5364 | ||
5365 | static tree | |
5366 | cp_parser_conditional_expression (parser) | |
5367 | cp_parser *parser; | |
5368 | { | |
5369 | tree logical_or_expr; | |
5370 | ||
5371 | /* Parse the logical-or-expression. */ | |
5372 | logical_or_expr = cp_parser_logical_or_expression (parser); | |
5373 | /* If the next token is a `?', then we have a real conditional | |
5374 | expression. */ | |
5375 | if (cp_lexer_next_token_is (parser->lexer, CPP_QUERY)) | |
5376 | return cp_parser_question_colon_clause (parser, logical_or_expr); | |
5377 | /* Otherwise, the value is simply the logical-or-expression. */ | |
5378 | else | |
5379 | return logical_or_expr; | |
5380 | } | |
5381 | ||
5382 | /* Parse the `? expression : assignment-expression' part of a | |
5383 | conditional-expression. The LOGICAL_OR_EXPR is the | |
5384 | logical-or-expression that started the conditional-expression. | |
5385 | Returns a representation of the entire conditional-expression. | |
5386 | ||
5387 | This routine exists only so that it can be shared between | |
5388 | cp_parser_conditional_expression and | |
5389 | cp_parser_assignment_expression. | |
5390 | ||
5391 | ? expression : assignment-expression | |
5392 | ||
5393 | GNU Extensions: | |
5394 | ||
5395 | ? : assignment-expression */ | |
5396 | ||
5397 | static tree | |
5398 | cp_parser_question_colon_clause (parser, logical_or_expr) | |
5399 | cp_parser *parser; | |
5400 | tree logical_or_expr; | |
5401 | { | |
5402 | tree expr; | |
5403 | tree assignment_expr; | |
5404 | ||
5405 | /* Consume the `?' token. */ | |
5406 | cp_lexer_consume_token (parser->lexer); | |
5407 | if (cp_parser_allow_gnu_extensions_p (parser) | |
5408 | && cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
5409 | /* Implicit true clause. */ | |
5410 | expr = NULL_TREE; | |
5411 | else | |
5412 | /* Parse the expression. */ | |
5413 | expr = cp_parser_expression (parser); | |
5414 | ||
5415 | /* The next token should be a `:'. */ | |
5416 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
5417 | /* Parse the assignment-expression. */ | |
5418 | assignment_expr = cp_parser_assignment_expression (parser); | |
5419 | ||
5420 | /* Build the conditional-expression. */ | |
5421 | return build_x_conditional_expr (logical_or_expr, | |
5422 | expr, | |
5423 | assignment_expr); | |
5424 | } | |
5425 | ||
5426 | /* Parse an assignment-expression. | |
5427 | ||
5428 | assignment-expression: | |
5429 | conditional-expression | |
5430 | logical-or-expression assignment-operator assignment_expression | |
5431 | throw-expression | |
5432 | ||
5433 | Returns a representation for the expression. */ | |
5434 | ||
5435 | static tree | |
5436 | cp_parser_assignment_expression (parser) | |
5437 | cp_parser *parser; | |
5438 | { | |
5439 | tree expr; | |
5440 | ||
5441 | /* If the next token is the `throw' keyword, then we're looking at | |
5442 | a throw-expression. */ | |
5443 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_THROW)) | |
5444 | expr = cp_parser_throw_expression (parser); | |
5445 | /* Otherwise, it must be that we are looking at a | |
5446 | logical-or-expression. */ | |
5447 | else | |
5448 | { | |
5449 | /* Parse the logical-or-expression. */ | |
5450 | expr = cp_parser_logical_or_expression (parser); | |
5451 | /* If the next token is a `?' then we're actually looking at a | |
5452 | conditional-expression. */ | |
5453 | if (cp_lexer_next_token_is (parser->lexer, CPP_QUERY)) | |
5454 | return cp_parser_question_colon_clause (parser, expr); | |
5455 | else | |
5456 | { | |
5457 | enum tree_code assignment_operator; | |
5458 | ||
5459 | /* If it's an assignment-operator, we're using the second | |
5460 | production. */ | |
5461 | assignment_operator | |
5462 | = cp_parser_assignment_operator_opt (parser); | |
5463 | if (assignment_operator != ERROR_MARK) | |
5464 | { | |
5465 | tree rhs; | |
5466 | ||
5467 | /* Parse the right-hand side of the assignment. */ | |
5468 | rhs = cp_parser_assignment_expression (parser); | |
5469 | /* Build the asignment expression. */ | |
5470 | expr = build_x_modify_expr (expr, | |
5471 | assignment_operator, | |
5472 | rhs); | |
5473 | } | |
5474 | } | |
5475 | } | |
5476 | ||
5477 | return expr; | |
5478 | } | |
5479 | ||
5480 | /* Parse an (optional) assignment-operator. | |
5481 | ||
5482 | assignment-operator: one of | |
5483 | = *= /= %= += -= >>= <<= &= ^= |= | |
5484 | ||
5485 | GNU Extension: | |
5486 | ||
5487 | assignment-operator: one of | |
5488 | <?= >?= | |
5489 | ||
5490 | If the next token is an assignment operator, the corresponding tree | |
5491 | code is returned, and the token is consumed. For example, for | |
5492 | `+=', PLUS_EXPR is returned. For `=' itself, the code returned is | |
5493 | NOP_EXPR. For `/', TRUNC_DIV_EXPR is returned; for `%', | |
5494 | TRUNC_MOD_EXPR is returned. If TOKEN is not an assignment | |
5495 | operator, ERROR_MARK is returned. */ | |
5496 | ||
5497 | static enum tree_code | |
5498 | cp_parser_assignment_operator_opt (parser) | |
5499 | cp_parser *parser; | |
5500 | { | |
5501 | enum tree_code op; | |
5502 | cp_token *token; | |
5503 | ||
5504 | /* Peek at the next toen. */ | |
5505 | token = cp_lexer_peek_token (parser->lexer); | |
5506 | ||
5507 | switch (token->type) | |
5508 | { | |
5509 | case CPP_EQ: | |
5510 | op = NOP_EXPR; | |
5511 | break; | |
5512 | ||
5513 | case CPP_MULT_EQ: | |
5514 | op = MULT_EXPR; | |
5515 | break; | |
5516 | ||
5517 | case CPP_DIV_EQ: | |
5518 | op = TRUNC_DIV_EXPR; | |
5519 | break; | |
5520 | ||
5521 | case CPP_MOD_EQ: | |
5522 | op = TRUNC_MOD_EXPR; | |
5523 | break; | |
5524 | ||
5525 | case CPP_PLUS_EQ: | |
5526 | op = PLUS_EXPR; | |
5527 | break; | |
5528 | ||
5529 | case CPP_MINUS_EQ: | |
5530 | op = MINUS_EXPR; | |
5531 | break; | |
5532 | ||
5533 | case CPP_RSHIFT_EQ: | |
5534 | op = RSHIFT_EXPR; | |
5535 | break; | |
5536 | ||
5537 | case CPP_LSHIFT_EQ: | |
5538 | op = LSHIFT_EXPR; | |
5539 | break; | |
5540 | ||
5541 | case CPP_AND_EQ: | |
5542 | op = BIT_AND_EXPR; | |
5543 | break; | |
5544 | ||
5545 | case CPP_XOR_EQ: | |
5546 | op = BIT_XOR_EXPR; | |
5547 | break; | |
5548 | ||
5549 | case CPP_OR_EQ: | |
5550 | op = BIT_IOR_EXPR; | |
5551 | break; | |
5552 | ||
5553 | case CPP_MIN_EQ: | |
5554 | op = MIN_EXPR; | |
5555 | break; | |
5556 | ||
5557 | case CPP_MAX_EQ: | |
5558 | op = MAX_EXPR; | |
5559 | break; | |
5560 | ||
5561 | default: | |
5562 | /* Nothing else is an assignment operator. */ | |
5563 | op = ERROR_MARK; | |
5564 | } | |
5565 | ||
5566 | /* If it was an assignment operator, consume it. */ | |
5567 | if (op != ERROR_MARK) | |
5568 | cp_lexer_consume_token (parser->lexer); | |
5569 | ||
5570 | return op; | |
5571 | } | |
5572 | ||
5573 | /* Parse an expression. | |
5574 | ||
5575 | expression: | |
5576 | assignment-expression | |
5577 | expression , assignment-expression | |
5578 | ||
5579 | Returns a representation of the expression. */ | |
5580 | ||
5581 | static tree | |
5582 | cp_parser_expression (parser) | |
5583 | cp_parser *parser; | |
5584 | { | |
5585 | tree expression = NULL_TREE; | |
5586 | bool saw_comma_p = false; | |
5587 | ||
5588 | while (true) | |
5589 | { | |
5590 | tree assignment_expression; | |
5591 | ||
5592 | /* Parse the next assignment-expression. */ | |
5593 | assignment_expression | |
5594 | = cp_parser_assignment_expression (parser); | |
5595 | /* If this is the first assignment-expression, we can just | |
5596 | save it away. */ | |
5597 | if (!expression) | |
5598 | expression = assignment_expression; | |
5599 | /* Otherwise, chain the expressions together. It is unclear why | |
5600 | we do not simply build COMPOUND_EXPRs as we go. */ | |
5601 | else | |
5602 | expression = tree_cons (NULL_TREE, | |
5603 | assignment_expression, | |
5604 | expression); | |
5605 | /* If the next token is not a comma, then we are done with the | |
5606 | expression. */ | |
5607 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
5608 | break; | |
5609 | /* Consume the `,'. */ | |
5610 | cp_lexer_consume_token (parser->lexer); | |
5611 | /* The first time we see a `,', we must take special action | |
5612 | because the representation used for a single expression is | |
5613 | different from that used for a list containing the single | |
5614 | expression. */ | |
5615 | if (!saw_comma_p) | |
5616 | { | |
5617 | /* Remember that this expression has a `,' in it. */ | |
5618 | saw_comma_p = true; | |
5619 | /* Turn the EXPRESSION into a TREE_LIST so that we can link | |
5620 | additional expressions to it. */ | |
5621 | expression = build_tree_list (NULL_TREE, expression); | |
5622 | } | |
5623 | } | |
5624 | ||
5625 | /* Build a COMPOUND_EXPR to represent the entire expression, if | |
5626 | necessary. We built up the list in reverse order, so we must | |
5627 | straighten it out here. */ | |
5628 | if (saw_comma_p) | |
5629 | expression = build_x_compound_expr (nreverse (expression)); | |
5630 | ||
5631 | return expression; | |
5632 | } | |
5633 | ||
5634 | /* Parse a constant-expression. | |
5635 | ||
5636 | constant-expression: | |
5637 | conditional-expression */ | |
5638 | ||
5639 | static tree | |
5640 | cp_parser_constant_expression (parser) | |
5641 | cp_parser *parser; | |
5642 | { | |
5643 | bool saved_constant_expression_p; | |
5644 | tree expression; | |
5645 | ||
5646 | /* It might seem that we could simply parse the | |
5647 | conditional-expression, and then check to see if it were | |
5648 | TREE_CONSTANT. However, an expression that is TREE_CONSTANT is | |
5649 | one that the compiler can figure out is constant, possibly after | |
5650 | doing some simplifications or optimizations. The standard has a | |
5651 | precise definition of constant-expression, and we must honor | |
5652 | that, even though it is somewhat more restrictive. | |
5653 | ||
5654 | For example: | |
5655 | ||
5656 | int i[(2, 3)]; | |
5657 | ||
5658 | is not a legal declaration, because `(2, 3)' is not a | |
5659 | constant-expression. The `,' operator is forbidden in a | |
5660 | constant-expression. However, GCC's constant-folding machinery | |
5661 | will fold this operation to an INTEGER_CST for `3'. */ | |
5662 | ||
5663 | /* Save the old setting of CONSTANT_EXPRESSION_P. */ | |
5664 | saved_constant_expression_p = parser->constant_expression_p; | |
5665 | /* We are now parsing a constant-expression. */ | |
5666 | parser->constant_expression_p = true; | |
5667 | /* Parse the conditional-expression. */ | |
5668 | expression = cp_parser_conditional_expression (parser); | |
5669 | /* Restore the old setting of CONSTANT_EXPRESSION_P. */ | |
5670 | parser->constant_expression_p = saved_constant_expression_p; | |
5671 | ||
5672 | return expression; | |
5673 | } | |
5674 | ||
5675 | /* Statements [gram.stmt.stmt] */ | |
5676 | ||
5677 | /* Parse a statement. | |
5678 | ||
5679 | statement: | |
5680 | labeled-statement | |
5681 | expression-statement | |
5682 | compound-statement | |
5683 | selection-statement | |
5684 | iteration-statement | |
5685 | jump-statement | |
5686 | declaration-statement | |
5687 | try-block */ | |
5688 | ||
5689 | static void | |
5690 | cp_parser_statement (parser) | |
5691 | cp_parser *parser; | |
5692 | { | |
5693 | tree statement; | |
5694 | cp_token *token; | |
5695 | int statement_line_number; | |
5696 | ||
5697 | /* There is no statement yet. */ | |
5698 | statement = NULL_TREE; | |
5699 | /* Peek at the next token. */ | |
5700 | token = cp_lexer_peek_token (parser->lexer); | |
5701 | /* Remember the line number of the first token in the statement. */ | |
5702 | statement_line_number = token->line_number; | |
5703 | /* If this is a keyword, then that will often determine what kind of | |
5704 | statement we have. */ | |
5705 | if (token->type == CPP_KEYWORD) | |
5706 | { | |
5707 | enum rid keyword = token->keyword; | |
5708 | ||
5709 | switch (keyword) | |
5710 | { | |
5711 | case RID_CASE: | |
5712 | case RID_DEFAULT: | |
5713 | statement = cp_parser_labeled_statement (parser); | |
5714 | break; | |
5715 | ||
5716 | case RID_IF: | |
5717 | case RID_SWITCH: | |
5718 | statement = cp_parser_selection_statement (parser); | |
5719 | break; | |
5720 | ||
5721 | case RID_WHILE: | |
5722 | case RID_DO: | |
5723 | case RID_FOR: | |
5724 | statement = cp_parser_iteration_statement (parser); | |
5725 | break; | |
5726 | ||
5727 | case RID_BREAK: | |
5728 | case RID_CONTINUE: | |
5729 | case RID_RETURN: | |
5730 | case RID_GOTO: | |
5731 | statement = cp_parser_jump_statement (parser); | |
5732 | break; | |
5733 | ||
5734 | case RID_TRY: | |
5735 | statement = cp_parser_try_block (parser); | |
5736 | break; | |
5737 | ||
5738 | default: | |
5739 | /* It might be a keyword like `int' that can start a | |
5740 | declaration-statement. */ | |
5741 | break; | |
5742 | } | |
5743 | } | |
5744 | else if (token->type == CPP_NAME) | |
5745 | { | |
5746 | /* If the next token is a `:', then we are looking at a | |
5747 | labeled-statement. */ | |
5748 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
5749 | if (token->type == CPP_COLON) | |
5750 | statement = cp_parser_labeled_statement (parser); | |
5751 | } | |
5752 | /* Anything that starts with a `{' must be a compound-statement. */ | |
5753 | else if (token->type == CPP_OPEN_BRACE) | |
5754 | statement = cp_parser_compound_statement (parser); | |
5755 | ||
5756 | /* Everything else must be a declaration-statement or an | |
5757 | expression-statement. Try for the declaration-statement | |
5758 | first, unless we are looking at a `;', in which case we know that | |
5759 | we have an expression-statement. */ | |
5760 | if (!statement) | |
5761 | { | |
5762 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
5763 | { | |
5764 | cp_parser_parse_tentatively (parser); | |
5765 | /* Try to parse the declaration-statement. */ | |
5766 | cp_parser_declaration_statement (parser); | |
5767 | /* If that worked, we're done. */ | |
5768 | if (cp_parser_parse_definitely (parser)) | |
5769 | return; | |
5770 | } | |
5771 | /* Look for an expression-statement instead. */ | |
5772 | statement = cp_parser_expression_statement (parser); | |
5773 | } | |
5774 | ||
5775 | /* Set the line number for the statement. */ | |
5776 | if (statement && statement_code_p (TREE_CODE (statement))) | |
5777 | STMT_LINENO (statement) = statement_line_number; | |
5778 | } | |
5779 | ||
5780 | /* Parse a labeled-statement. | |
5781 | ||
5782 | labeled-statement: | |
5783 | identifier : statement | |
5784 | case constant-expression : statement | |
5785 | default : statement | |
5786 | ||
5787 | Returns the new CASE_LABEL, for a `case' or `default' label. For | |
5788 | an ordinary label, returns a LABEL_STMT. */ | |
5789 | ||
5790 | static tree | |
5791 | cp_parser_labeled_statement (parser) | |
5792 | cp_parser *parser; | |
5793 | { | |
5794 | cp_token *token; | |
5795 | tree statement = NULL_TREE; | |
5796 | ||
5797 | /* The next token should be an identifier. */ | |
5798 | token = cp_lexer_peek_token (parser->lexer); | |
5799 | if (token->type != CPP_NAME | |
5800 | && token->type != CPP_KEYWORD) | |
5801 | { | |
5802 | cp_parser_error (parser, "expected labeled-statement"); | |
5803 | return error_mark_node; | |
5804 | } | |
5805 | ||
5806 | switch (token->keyword) | |
5807 | { | |
5808 | case RID_CASE: | |
5809 | { | |
5810 | tree expr; | |
5811 | ||
5812 | /* Consume the `case' token. */ | |
5813 | cp_lexer_consume_token (parser->lexer); | |
5814 | /* Parse the constant-expression. */ | |
5815 | expr = cp_parser_constant_expression (parser); | |
5816 | /* Create the label. */ | |
5817 | statement = finish_case_label (expr, NULL_TREE); | |
5818 | } | |
5819 | break; | |
5820 | ||
5821 | case RID_DEFAULT: | |
5822 | /* Consume the `default' token. */ | |
5823 | cp_lexer_consume_token (parser->lexer); | |
5824 | /* Create the label. */ | |
5825 | statement = finish_case_label (NULL_TREE, NULL_TREE); | |
5826 | break; | |
5827 | ||
5828 | default: | |
5829 | /* Anything else must be an ordinary label. */ | |
5830 | statement = finish_label_stmt (cp_parser_identifier (parser)); | |
5831 | break; | |
5832 | } | |
5833 | ||
5834 | /* Require the `:' token. */ | |
5835 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
5836 | /* Parse the labeled statement. */ | |
5837 | cp_parser_statement (parser); | |
5838 | ||
5839 | /* Return the label, in the case of a `case' or `default' label. */ | |
5840 | return statement; | |
5841 | } | |
5842 | ||
5843 | /* Parse an expression-statement. | |
5844 | ||
5845 | expression-statement: | |
5846 | expression [opt] ; | |
5847 | ||
5848 | Returns the new EXPR_STMT -- or NULL_TREE if the expression | |
5849 | statement consists of nothing more than an `;'. */ | |
5850 | ||
5851 | static tree | |
5852 | cp_parser_expression_statement (parser) | |
5853 | cp_parser *parser; | |
5854 | { | |
5855 | tree statement; | |
5856 | ||
5857 | /* If the next token is not a `;', then there is an expression to parse. */ | |
5858 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
5859 | statement = finish_expr_stmt (cp_parser_expression (parser)); | |
5860 | /* Otherwise, we do not even bother to build an EXPR_STMT. */ | |
5861 | else | |
5862 | { | |
5863 | finish_stmt (); | |
5864 | statement = NULL_TREE; | |
5865 | } | |
5866 | /* Consume the final `;'. */ | |
5867 | if (!cp_parser_require (parser, CPP_SEMICOLON, "`;'")) | |
5868 | { | |
5869 | /* If there is additional (erroneous) input, skip to the end of | |
5870 | the statement. */ | |
5871 | cp_parser_skip_to_end_of_statement (parser); | |
5872 | /* If the next token is now a `;', consume it. */ | |
5873 | if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
5874 | cp_lexer_consume_token (parser->lexer); | |
5875 | } | |
5876 | ||
5877 | return statement; | |
5878 | } | |
5879 | ||
5880 | /* Parse a compound-statement. | |
5881 | ||
5882 | compound-statement: | |
5883 | { statement-seq [opt] } | |
5884 | ||
5885 | Returns a COMPOUND_STMT representing the statement. */ | |
5886 | ||
5887 | static tree | |
5888 | cp_parser_compound_statement (cp_parser *parser) | |
5889 | { | |
5890 | tree compound_stmt; | |
5891 | ||
5892 | /* Consume the `{'. */ | |
5893 | if (!cp_parser_require (parser, CPP_OPEN_BRACE, "`{'")) | |
5894 | return error_mark_node; | |
5895 | /* Begin the compound-statement. */ | |
5896 | compound_stmt = begin_compound_stmt (/*has_no_scope=*/0); | |
5897 | /* Parse an (optional) statement-seq. */ | |
5898 | cp_parser_statement_seq_opt (parser); | |
5899 | /* Finish the compound-statement. */ | |
5900 | finish_compound_stmt (/*has_no_scope=*/0, compound_stmt); | |
5901 | /* Consume the `}'. */ | |
5902 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
5903 | ||
5904 | return compound_stmt; | |
5905 | } | |
5906 | ||
5907 | /* Parse an (optional) statement-seq. | |
5908 | ||
5909 | statement-seq: | |
5910 | statement | |
5911 | statement-seq [opt] statement */ | |
5912 | ||
5913 | static void | |
5914 | cp_parser_statement_seq_opt (parser) | |
5915 | cp_parser *parser; | |
5916 | { | |
5917 | /* Scan statements until there aren't any more. */ | |
5918 | while (true) | |
5919 | { | |
5920 | /* If we're looking at a `}', then we've run out of statements. */ | |
5921 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_BRACE) | |
5922 | || cp_lexer_next_token_is (parser->lexer, CPP_EOF)) | |
5923 | break; | |
5924 | ||
5925 | /* Parse the statement. */ | |
5926 | cp_parser_statement (parser); | |
5927 | } | |
5928 | } | |
5929 | ||
5930 | /* Parse a selection-statement. | |
5931 | ||
5932 | selection-statement: | |
5933 | if ( condition ) statement | |
5934 | if ( condition ) statement else statement | |
5935 | switch ( condition ) statement | |
5936 | ||
5937 | Returns the new IF_STMT or SWITCH_STMT. */ | |
5938 | ||
5939 | static tree | |
5940 | cp_parser_selection_statement (parser) | |
5941 | cp_parser *parser; | |
5942 | { | |
5943 | cp_token *token; | |
5944 | enum rid keyword; | |
5945 | ||
5946 | /* Peek at the next token. */ | |
5947 | token = cp_parser_require (parser, CPP_KEYWORD, "selection-statement"); | |
5948 | ||
5949 | /* See what kind of keyword it is. */ | |
5950 | keyword = token->keyword; | |
5951 | switch (keyword) | |
5952 | { | |
5953 | case RID_IF: | |
5954 | case RID_SWITCH: | |
5955 | { | |
5956 | tree statement; | |
5957 | tree condition; | |
5958 | ||
5959 | /* Look for the `('. */ | |
5960 | if (!cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) | |
5961 | { | |
5962 | cp_parser_skip_to_end_of_statement (parser); | |
5963 | return error_mark_node; | |
5964 | } | |
5965 | ||
5966 | /* Begin the selection-statement. */ | |
5967 | if (keyword == RID_IF) | |
5968 | statement = begin_if_stmt (); | |
5969 | else | |
5970 | statement = begin_switch_stmt (); | |
5971 | ||
5972 | /* Parse the condition. */ | |
5973 | condition = cp_parser_condition (parser); | |
5974 | /* Look for the `)'. */ | |
5975 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
5976 | cp_parser_skip_to_closing_parenthesis (parser); | |
5977 | ||
5978 | if (keyword == RID_IF) | |
5979 | { | |
5980 | tree then_stmt; | |
5981 | ||
5982 | /* Add the condition. */ | |
5983 | finish_if_stmt_cond (condition, statement); | |
5984 | ||
5985 | /* Parse the then-clause. */ | |
5986 | then_stmt = cp_parser_implicitly_scoped_statement (parser); | |
5987 | finish_then_clause (statement); | |
5988 | ||
5989 | /* If the next token is `else', parse the else-clause. */ | |
5990 | if (cp_lexer_next_token_is_keyword (parser->lexer, | |
5991 | RID_ELSE)) | |
5992 | { | |
5993 | tree else_stmt; | |
5994 | ||
5995 | /* Consume the `else' keyword. */ | |
5996 | cp_lexer_consume_token (parser->lexer); | |
5997 | /* Parse the else-clause. */ | |
5998 | else_stmt | |
5999 | = cp_parser_implicitly_scoped_statement (parser); | |
6000 | finish_else_clause (statement); | |
6001 | } | |
6002 | ||
6003 | /* Now we're all done with the if-statement. */ | |
6004 | finish_if_stmt (); | |
6005 | } | |
6006 | else | |
6007 | { | |
6008 | tree body; | |
6009 | ||
6010 | /* Add the condition. */ | |
6011 | finish_switch_cond (condition, statement); | |
6012 | ||
6013 | /* Parse the body of the switch-statement. */ | |
6014 | body = cp_parser_implicitly_scoped_statement (parser); | |
6015 | ||
6016 | /* Now we're all done with the switch-statement. */ | |
6017 | finish_switch_stmt (statement); | |
6018 | } | |
6019 | ||
6020 | return statement; | |
6021 | } | |
6022 | break; | |
6023 | ||
6024 | default: | |
6025 | cp_parser_error (parser, "expected selection-statement"); | |
6026 | return error_mark_node; | |
6027 | } | |
6028 | } | |
6029 | ||
6030 | /* Parse a condition. | |
6031 | ||
6032 | condition: | |
6033 | expression | |
6034 | type-specifier-seq declarator = assignment-expression | |
6035 | ||
6036 | GNU Extension: | |
6037 | ||
6038 | condition: | |
6039 | type-specifier-seq declarator asm-specification [opt] | |
6040 | attributes [opt] = assignment-expression | |
6041 | ||
6042 | Returns the expression that should be tested. */ | |
6043 | ||
6044 | static tree | |
6045 | cp_parser_condition (parser) | |
6046 | cp_parser *parser; | |
6047 | { | |
6048 | tree type_specifiers; | |
6049 | const char *saved_message; | |
6050 | ||
6051 | /* Try the declaration first. */ | |
6052 | cp_parser_parse_tentatively (parser); | |
6053 | /* New types are not allowed in the type-specifier-seq for a | |
6054 | condition. */ | |
6055 | saved_message = parser->type_definition_forbidden_message; | |
6056 | parser->type_definition_forbidden_message | |
6057 | = "types may not be defined in conditions"; | |
6058 | /* Parse the type-specifier-seq. */ | |
6059 | type_specifiers = cp_parser_type_specifier_seq (parser); | |
6060 | /* Restore the saved message. */ | |
6061 | parser->type_definition_forbidden_message = saved_message; | |
6062 | /* If all is well, we might be looking at a declaration. */ | |
6063 | if (!cp_parser_error_occurred (parser)) | |
6064 | { | |
6065 | tree decl; | |
6066 | tree asm_specification; | |
6067 | tree attributes; | |
6068 | tree declarator; | |
6069 | tree initializer = NULL_TREE; | |
6070 | ||
6071 | /* Parse the declarator. */ | |
6072 | declarator = cp_parser_declarator (parser, | |
6073 | /*abstract_p=*/false, | |
6074 | /*ctor_dtor_or_conv_p=*/NULL); | |
6075 | /* Parse the attributes. */ | |
6076 | attributes = cp_parser_attributes_opt (parser); | |
6077 | /* Parse the asm-specification. */ | |
6078 | asm_specification = cp_parser_asm_specification_opt (parser); | |
6079 | /* If the next token is not an `=', then we might still be | |
6080 | looking at an expression. For example: | |
6081 | ||
6082 | if (A(a).x) | |
6083 | ||
6084 | looks like a decl-specifier-seq and a declarator -- but then | |
6085 | there is no `=', so this is an expression. */ | |
6086 | cp_parser_require (parser, CPP_EQ, "`='"); | |
6087 | /* If we did see an `=', then we are looking at a declaration | |
6088 | for sure. */ | |
6089 | if (cp_parser_parse_definitely (parser)) | |
6090 | { | |
6091 | /* Create the declaration. */ | |
6092 | decl = start_decl (declarator, type_specifiers, | |
6093 | /*initialized_p=*/true, | |
6094 | attributes, /*prefix_attributes=*/NULL_TREE); | |
6095 | /* Parse the assignment-expression. */ | |
6096 | initializer = cp_parser_assignment_expression (parser); | |
6097 | ||
6098 | /* Process the initializer. */ | |
6099 | cp_finish_decl (decl, | |
6100 | initializer, | |
6101 | asm_specification, | |
6102 | LOOKUP_ONLYCONVERTING); | |
6103 | ||
6104 | return convert_from_reference (decl); | |
6105 | } | |
6106 | } | |
6107 | /* If we didn't even get past the declarator successfully, we are | |
6108 | definitely not looking at a declaration. */ | |
6109 | else | |
6110 | cp_parser_abort_tentative_parse (parser); | |
6111 | ||
6112 | /* Otherwise, we are looking at an expression. */ | |
6113 | return cp_parser_expression (parser); | |
6114 | } | |
6115 | ||
6116 | /* Parse an iteration-statement. | |
6117 | ||
6118 | iteration-statement: | |
6119 | while ( condition ) statement | |
6120 | do statement while ( expression ) ; | |
6121 | for ( for-init-statement condition [opt] ; expression [opt] ) | |
6122 | statement | |
6123 | ||
6124 | Returns the new WHILE_STMT, DO_STMT, or FOR_STMT. */ | |
6125 | ||
6126 | static tree | |
6127 | cp_parser_iteration_statement (parser) | |
6128 | cp_parser *parser; | |
6129 | { | |
6130 | cp_token *token; | |
6131 | enum rid keyword; | |
6132 | tree statement; | |
6133 | ||
6134 | /* Peek at the next token. */ | |
6135 | token = cp_parser_require (parser, CPP_KEYWORD, "iteration-statement"); | |
6136 | if (!token) | |
6137 | return error_mark_node; | |
6138 | ||
6139 | /* See what kind of keyword it is. */ | |
6140 | keyword = token->keyword; | |
6141 | switch (keyword) | |
6142 | { | |
6143 | case RID_WHILE: | |
6144 | { | |
6145 | tree condition; | |
6146 | ||
6147 | /* Begin the while-statement. */ | |
6148 | statement = begin_while_stmt (); | |
6149 | /* Look for the `('. */ | |
6150 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
6151 | /* Parse the condition. */ | |
6152 | condition = cp_parser_condition (parser); | |
6153 | finish_while_stmt_cond (condition, statement); | |
6154 | /* Look for the `)'. */ | |
6155 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
6156 | /* Parse the dependent statement. */ | |
6157 | cp_parser_already_scoped_statement (parser); | |
6158 | /* We're done with the while-statement. */ | |
6159 | finish_while_stmt (statement); | |
6160 | } | |
6161 | break; | |
6162 | ||
6163 | case RID_DO: | |
6164 | { | |
6165 | tree expression; | |
6166 | ||
6167 | /* Begin the do-statement. */ | |
6168 | statement = begin_do_stmt (); | |
6169 | /* Parse the body of the do-statement. */ | |
6170 | cp_parser_implicitly_scoped_statement (parser); | |
6171 | finish_do_body (statement); | |
6172 | /* Look for the `while' keyword. */ | |
6173 | cp_parser_require_keyword (parser, RID_WHILE, "`while'"); | |
6174 | /* Look for the `('. */ | |
6175 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
6176 | /* Parse the expression. */ | |
6177 | expression = cp_parser_expression (parser); | |
6178 | /* We're done with the do-statement. */ | |
6179 | finish_do_stmt (expression, statement); | |
6180 | /* Look for the `)'. */ | |
6181 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
6182 | /* Look for the `;'. */ | |
6183 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6184 | } | |
6185 | break; | |
6186 | ||
6187 | case RID_FOR: | |
6188 | { | |
6189 | tree condition = NULL_TREE; | |
6190 | tree expression = NULL_TREE; | |
6191 | ||
6192 | /* Begin the for-statement. */ | |
6193 | statement = begin_for_stmt (); | |
6194 | /* Look for the `('. */ | |
6195 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
6196 | /* Parse the initialization. */ | |
6197 | cp_parser_for_init_statement (parser); | |
6198 | finish_for_init_stmt (statement); | |
6199 | ||
6200 | /* If there's a condition, process it. */ | |
6201 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
6202 | condition = cp_parser_condition (parser); | |
6203 | finish_for_cond (condition, statement); | |
6204 | /* Look for the `;'. */ | |
6205 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6206 | ||
6207 | /* If there's an expression, process it. */ | |
6208 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_PAREN)) | |
6209 | expression = cp_parser_expression (parser); | |
6210 | finish_for_expr (expression, statement); | |
6211 | /* Look for the `)'. */ | |
6212 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`;'"); | |
6213 | ||
6214 | /* Parse the body of the for-statement. */ | |
6215 | cp_parser_already_scoped_statement (parser); | |
6216 | ||
6217 | /* We're done with the for-statement. */ | |
6218 | finish_for_stmt (statement); | |
6219 | } | |
6220 | break; | |
6221 | ||
6222 | default: | |
6223 | cp_parser_error (parser, "expected iteration-statement"); | |
6224 | statement = error_mark_node; | |
6225 | break; | |
6226 | } | |
6227 | ||
6228 | return statement; | |
6229 | } | |
6230 | ||
6231 | /* Parse a for-init-statement. | |
6232 | ||
6233 | for-init-statement: | |
6234 | expression-statement | |
6235 | simple-declaration */ | |
6236 | ||
6237 | static void | |
6238 | cp_parser_for_init_statement (parser) | |
6239 | cp_parser *parser; | |
6240 | { | |
6241 | /* If the next token is a `;', then we have an empty | |
6242 | expression-statement. Gramatically, this is also a | |
6243 | simple-declaration, but an invalid one, because it does not | |
6244 | declare anything. Therefore, if we did not handle this case | |
6245 | specially, we would issue an error message about an invalid | |
6246 | declaration. */ | |
6247 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
6248 | { | |
6249 | /* We're going to speculatively look for a declaration, falling back | |
6250 | to an expression, if necessary. */ | |
6251 | cp_parser_parse_tentatively (parser); | |
6252 | /* Parse the declaration. */ | |
6253 | cp_parser_simple_declaration (parser, | |
6254 | /*function_definition_allowed_p=*/false); | |
6255 | /* If the tentative parse failed, then we shall need to look for an | |
6256 | expression-statement. */ | |
6257 | if (cp_parser_parse_definitely (parser)) | |
6258 | return; | |
6259 | } | |
6260 | ||
6261 | cp_parser_expression_statement (parser); | |
6262 | } | |
6263 | ||
6264 | /* Parse a jump-statement. | |
6265 | ||
6266 | jump-statement: | |
6267 | break ; | |
6268 | continue ; | |
6269 | return expression [opt] ; | |
6270 | goto identifier ; | |
6271 | ||
6272 | GNU extension: | |
6273 | ||
6274 | jump-statement: | |
6275 | goto * expression ; | |
6276 | ||
6277 | Returns the new BREAK_STMT, CONTINUE_STMT, RETURN_STMT, or | |
6278 | GOTO_STMT. */ | |
6279 | ||
6280 | static tree | |
6281 | cp_parser_jump_statement (parser) | |
6282 | cp_parser *parser; | |
6283 | { | |
6284 | tree statement = error_mark_node; | |
6285 | cp_token *token; | |
6286 | enum rid keyword; | |
6287 | ||
6288 | /* Peek at the next token. */ | |
6289 | token = cp_parser_require (parser, CPP_KEYWORD, "jump-statement"); | |
6290 | if (!token) | |
6291 | return error_mark_node; | |
6292 | ||
6293 | /* See what kind of keyword it is. */ | |
6294 | keyword = token->keyword; | |
6295 | switch (keyword) | |
6296 | { | |
6297 | case RID_BREAK: | |
6298 | statement = finish_break_stmt (); | |
6299 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6300 | break; | |
6301 | ||
6302 | case RID_CONTINUE: | |
6303 | statement = finish_continue_stmt (); | |
6304 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6305 | break; | |
6306 | ||
6307 | case RID_RETURN: | |
6308 | { | |
6309 | tree expr; | |
6310 | ||
6311 | /* If the next token is a `;', then there is no | |
6312 | expression. */ | |
6313 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
6314 | expr = cp_parser_expression (parser); | |
6315 | else | |
6316 | expr = NULL_TREE; | |
6317 | /* Build the return-statement. */ | |
6318 | statement = finish_return_stmt (expr); | |
6319 | /* Look for the final `;'. */ | |
6320 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6321 | } | |
6322 | break; | |
6323 | ||
6324 | case RID_GOTO: | |
6325 | /* Create the goto-statement. */ | |
6326 | if (cp_lexer_next_token_is (parser->lexer, CPP_MULT)) | |
6327 | { | |
6328 | /* Issue a warning about this use of a GNU extension. */ | |
6329 | if (pedantic) | |
6330 | pedwarn ("ISO C++ forbids computed gotos"); | |
6331 | /* Consume the '*' token. */ | |
6332 | cp_lexer_consume_token (parser->lexer); | |
6333 | /* Parse the dependent expression. */ | |
6334 | finish_goto_stmt (cp_parser_expression (parser)); | |
6335 | } | |
6336 | else | |
6337 | finish_goto_stmt (cp_parser_identifier (parser)); | |
6338 | /* Look for the final `;'. */ | |
6339 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6340 | break; | |
6341 | ||
6342 | default: | |
6343 | cp_parser_error (parser, "expected jump-statement"); | |
6344 | break; | |
6345 | } | |
6346 | ||
6347 | return statement; | |
6348 | } | |
6349 | ||
6350 | /* Parse a declaration-statement. | |
6351 | ||
6352 | declaration-statement: | |
6353 | block-declaration */ | |
6354 | ||
6355 | static void | |
6356 | cp_parser_declaration_statement (parser) | |
6357 | cp_parser *parser; | |
6358 | { | |
6359 | /* Parse the block-declaration. */ | |
6360 | cp_parser_block_declaration (parser, /*statement_p=*/true); | |
6361 | ||
6362 | /* Finish off the statement. */ | |
6363 | finish_stmt (); | |
6364 | } | |
6365 | ||
6366 | /* Some dependent statements (like `if (cond) statement'), are | |
6367 | implicitly in their own scope. In other words, if the statement is | |
6368 | a single statement (as opposed to a compound-statement), it is | |
6369 | none-the-less treated as if it were enclosed in braces. Any | |
6370 | declarations appearing in the dependent statement are out of scope | |
6371 | after control passes that point. This function parses a statement, | |
6372 | but ensures that is in its own scope, even if it is not a | |
6373 | compound-statement. | |
6374 | ||
6375 | Returns the new statement. */ | |
6376 | ||
6377 | static tree | |
6378 | cp_parser_implicitly_scoped_statement (parser) | |
6379 | cp_parser *parser; | |
6380 | { | |
6381 | tree statement; | |
6382 | ||
6383 | /* If the token is not a `{', then we must take special action. */ | |
6384 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_BRACE)) | |
6385 | { | |
6386 | /* Create a compound-statement. */ | |
6387 | statement = begin_compound_stmt (/*has_no_scope=*/0); | |
6388 | /* Parse the dependent-statement. */ | |
6389 | cp_parser_statement (parser); | |
6390 | /* Finish the dummy compound-statement. */ | |
6391 | finish_compound_stmt (/*has_no_scope=*/0, statement); | |
6392 | } | |
6393 | /* Otherwise, we simply parse the statement directly. */ | |
6394 | else | |
6395 | statement = cp_parser_compound_statement (parser); | |
6396 | ||
6397 | /* Return the statement. */ | |
6398 | return statement; | |
6399 | } | |
6400 | ||
6401 | /* For some dependent statements (like `while (cond) statement'), we | |
6402 | have already created a scope. Therefore, even if the dependent | |
6403 | statement is a compound-statement, we do not want to create another | |
6404 | scope. */ | |
6405 | ||
6406 | static void | |
6407 | cp_parser_already_scoped_statement (parser) | |
6408 | cp_parser *parser; | |
6409 | { | |
6410 | /* If the token is not a `{', then we must take special action. */ | |
6411 | if (cp_lexer_next_token_is_not(parser->lexer, CPP_OPEN_BRACE)) | |
6412 | { | |
6413 | tree statement; | |
6414 | ||
6415 | /* Create a compound-statement. */ | |
6416 | statement = begin_compound_stmt (/*has_no_scope=*/1); | |
6417 | /* Parse the dependent-statement. */ | |
6418 | cp_parser_statement (parser); | |
6419 | /* Finish the dummy compound-statement. */ | |
6420 | finish_compound_stmt (/*has_no_scope=*/1, statement); | |
6421 | } | |
6422 | /* Otherwise, we simply parse the statement directly. */ | |
6423 | else | |
6424 | cp_parser_statement (parser); | |
6425 | } | |
6426 | ||
6427 | /* Declarations [gram.dcl.dcl] */ | |
6428 | ||
6429 | /* Parse an optional declaration-sequence. | |
6430 | ||
6431 | declaration-seq: | |
6432 | declaration | |
6433 | declaration-seq declaration */ | |
6434 | ||
6435 | static void | |
6436 | cp_parser_declaration_seq_opt (parser) | |
6437 | cp_parser *parser; | |
6438 | { | |
6439 | while (true) | |
6440 | { | |
6441 | cp_token *token; | |
6442 | ||
6443 | token = cp_lexer_peek_token (parser->lexer); | |
6444 | ||
6445 | if (token->type == CPP_CLOSE_BRACE | |
6446 | || token->type == CPP_EOF) | |
6447 | break; | |
6448 | ||
6449 | if (token->type == CPP_SEMICOLON) | |
6450 | { | |
6451 | /* A declaration consisting of a single semicolon is | |
6452 | invalid. Allow it unless we're being pedantic. */ | |
6453 | if (pedantic) | |
6454 | pedwarn ("extra `;'"); | |
6455 | cp_lexer_consume_token (parser->lexer); | |
6456 | continue; | |
6457 | } | |
6458 | ||
6459 | cp_parser_declaration (parser); | |
6460 | } | |
6461 | } | |
6462 | ||
6463 | /* Parse a declaration. | |
6464 | ||
6465 | declaration: | |
6466 | block-declaration | |
6467 | function-definition | |
6468 | template-declaration | |
6469 | explicit-instantiation | |
6470 | explicit-specialization | |
6471 | linkage-specification | |
6472 | namespace-definition */ | |
6473 | ||
6474 | static void | |
6475 | cp_parser_declaration (parser) | |
6476 | cp_parser *parser; | |
6477 | { | |
6478 | cp_token token1; | |
6479 | cp_token token2; | |
6480 | ||
6481 | /* Try to figure out what kind of declaration is present. */ | |
6482 | token1 = *cp_lexer_peek_token (parser->lexer); | |
6483 | if (token1.type != CPP_EOF) | |
6484 | token2 = *cp_lexer_peek_nth_token (parser->lexer, 2); | |
6485 | ||
6486 | /* If the next token is `extern' and the following token is a string | |
6487 | literal, then we have a linkage specification. */ | |
6488 | if (token1.keyword == RID_EXTERN | |
6489 | && cp_parser_is_string_literal (&token2)) | |
6490 | cp_parser_linkage_specification (parser); | |
6491 | /* If the next token is `template', then we have either a template | |
6492 | declaration, an explicit instantiation, or an explicit | |
6493 | specialization. */ | |
6494 | else if (token1.keyword == RID_TEMPLATE) | |
6495 | { | |
6496 | /* `template <>' indicates a template specialization. */ | |
6497 | if (token2.type == CPP_LESS | |
6498 | && cp_lexer_peek_nth_token (parser->lexer, 3)->type == CPP_GREATER) | |
6499 | cp_parser_explicit_specialization (parser); | |
6500 | /* `template <' indicates a template declaration. */ | |
6501 | else if (token2.type == CPP_LESS) | |
6502 | cp_parser_template_declaration (parser, /*member_p=*/false); | |
6503 | /* Anything else must be an explicit instantiation. */ | |
6504 | else | |
6505 | cp_parser_explicit_instantiation (parser); | |
6506 | } | |
6507 | /* If the next token is `export', then we have a template | |
6508 | declaration. */ | |
6509 | else if (token1.keyword == RID_EXPORT) | |
6510 | cp_parser_template_declaration (parser, /*member_p=*/false); | |
6511 | /* If the next token is `extern', 'static' or 'inline' and the one | |
6512 | after that is `template', we have a GNU extended explicit | |
6513 | instantiation directive. */ | |
6514 | else if (cp_parser_allow_gnu_extensions_p (parser) | |
6515 | && (token1.keyword == RID_EXTERN | |
6516 | || token1.keyword == RID_STATIC | |
6517 | || token1.keyword == RID_INLINE) | |
6518 | && token2.keyword == RID_TEMPLATE) | |
6519 | cp_parser_explicit_instantiation (parser); | |
6520 | /* If the next token is `namespace', check for a named or unnamed | |
6521 | namespace definition. */ | |
6522 | else if (token1.keyword == RID_NAMESPACE | |
6523 | && (/* A named namespace definition. */ | |
6524 | (token2.type == CPP_NAME | |
6525 | && (cp_lexer_peek_nth_token (parser->lexer, 3)->type | |
6526 | == CPP_OPEN_BRACE)) | |
6527 | /* An unnamed namespace definition. */ | |
6528 | || token2.type == CPP_OPEN_BRACE)) | |
6529 | cp_parser_namespace_definition (parser); | |
6530 | /* We must have either a block declaration or a function | |
6531 | definition. */ | |
6532 | else | |
6533 | /* Try to parse a block-declaration, or a function-definition. */ | |
6534 | cp_parser_block_declaration (parser, /*statement_p=*/false); | |
6535 | } | |
6536 | ||
6537 | /* Parse a block-declaration. | |
6538 | ||
6539 | block-declaration: | |
6540 | simple-declaration | |
6541 | asm-definition | |
6542 | namespace-alias-definition | |
6543 | using-declaration | |
6544 | using-directive | |
6545 | ||
6546 | GNU Extension: | |
6547 | ||
6548 | block-declaration: | |
6549 | __extension__ block-declaration | |
6550 | label-declaration | |
6551 | ||
6552 | If STATEMENT_P is TRUE, then this block-declaration is ocurring as | |
6553 | part of a declaration-statement. */ | |
6554 | ||
6555 | static void | |
6556 | cp_parser_block_declaration (cp_parser *parser, | |
6557 | bool statement_p) | |
6558 | { | |
6559 | cp_token *token1; | |
6560 | int saved_pedantic; | |
6561 | ||
6562 | /* Check for the `__extension__' keyword. */ | |
6563 | if (cp_parser_extension_opt (parser, &saved_pedantic)) | |
6564 | { | |
6565 | /* Parse the qualified declaration. */ | |
6566 | cp_parser_block_declaration (parser, statement_p); | |
6567 | /* Restore the PEDANTIC flag. */ | |
6568 | pedantic = saved_pedantic; | |
6569 | ||
6570 | return; | |
6571 | } | |
6572 | ||
6573 | /* Peek at the next token to figure out which kind of declaration is | |
6574 | present. */ | |
6575 | token1 = cp_lexer_peek_token (parser->lexer); | |
6576 | ||
6577 | /* If the next keyword is `asm', we have an asm-definition. */ | |
6578 | if (token1->keyword == RID_ASM) | |
6579 | { | |
6580 | if (statement_p) | |
6581 | cp_parser_commit_to_tentative_parse (parser); | |
6582 | cp_parser_asm_definition (parser); | |
6583 | } | |
6584 | /* If the next keyword is `namespace', we have a | |
6585 | namespace-alias-definition. */ | |
6586 | else if (token1->keyword == RID_NAMESPACE) | |
6587 | cp_parser_namespace_alias_definition (parser); | |
6588 | /* If the next keyword is `using', we have either a | |
6589 | using-declaration or a using-directive. */ | |
6590 | else if (token1->keyword == RID_USING) | |
6591 | { | |
6592 | cp_token *token2; | |
6593 | ||
6594 | if (statement_p) | |
6595 | cp_parser_commit_to_tentative_parse (parser); | |
6596 | /* If the token after `using' is `namespace', then we have a | |
6597 | using-directive. */ | |
6598 | token2 = cp_lexer_peek_nth_token (parser->lexer, 2); | |
6599 | if (token2->keyword == RID_NAMESPACE) | |
6600 | cp_parser_using_directive (parser); | |
6601 | /* Otherwise, it's a using-declaration. */ | |
6602 | else | |
6603 | cp_parser_using_declaration (parser); | |
6604 | } | |
6605 | /* If the next keyword is `__label__' we have a label declaration. */ | |
6606 | else if (token1->keyword == RID_LABEL) | |
6607 | { | |
6608 | if (statement_p) | |
6609 | cp_parser_commit_to_tentative_parse (parser); | |
6610 | cp_parser_label_declaration (parser); | |
6611 | } | |
6612 | /* Anything else must be a simple-declaration. */ | |
6613 | else | |
6614 | cp_parser_simple_declaration (parser, !statement_p); | |
6615 | } | |
6616 | ||
6617 | /* Parse a simple-declaration. | |
6618 | ||
6619 | simple-declaration: | |
6620 | decl-specifier-seq [opt] init-declarator-list [opt] ; | |
6621 | ||
6622 | init-declarator-list: | |
6623 | init-declarator | |
6624 | init-declarator-list , init-declarator | |
6625 | ||
6626 | If FUNCTION_DEFINTION_ALLOWED_P is TRUE, then we also recognize a | |
6627 | function-definition as a simple-declaration. */ | |
6628 | ||
6629 | static void | |
6630 | cp_parser_simple_declaration (parser, function_definition_allowed_p) | |
6631 | cp_parser *parser; | |
6632 | bool function_definition_allowed_p; | |
6633 | { | |
6634 | tree decl_specifiers; | |
6635 | tree attributes; | |
6636 | tree access_checks; | |
6637 | bool declares_class_or_enum; | |
6638 | bool saw_declarator; | |
6639 | ||
6640 | /* Defer access checks until we know what is being declared; the | |
6641 | checks for names appearing in the decl-specifier-seq should be | |
6642 | done as if we were in the scope of the thing being declared. */ | |
6643 | cp_parser_start_deferring_access_checks (parser); | |
6644 | /* Parse the decl-specifier-seq. We have to keep track of whether | |
6645 | or not the decl-specifier-seq declares a named class or | |
6646 | enumeration type, since that is the only case in which the | |
6647 | init-declarator-list is allowed to be empty. | |
6648 | ||
6649 | [dcl.dcl] | |
6650 | ||
6651 | In a simple-declaration, the optional init-declarator-list can be | |
6652 | omitted only when declaring a class or enumeration, that is when | |
6653 | the decl-specifier-seq contains either a class-specifier, an | |
6654 | elaborated-type-specifier, or an enum-specifier. */ | |
6655 | decl_specifiers | |
6656 | = cp_parser_decl_specifier_seq (parser, | |
6657 | CP_PARSER_FLAGS_OPTIONAL, | |
6658 | &attributes, | |
6659 | &declares_class_or_enum); | |
6660 | /* We no longer need to defer access checks. */ | |
6661 | access_checks = cp_parser_stop_deferring_access_checks (parser); | |
6662 | ||
6663 | /* Keep going until we hit the `;' at the end of the simple | |
6664 | declaration. */ | |
6665 | saw_declarator = false; | |
6666 | while (cp_lexer_next_token_is_not (parser->lexer, | |
6667 | CPP_SEMICOLON)) | |
6668 | { | |
6669 | cp_token *token; | |
6670 | bool function_definition_p; | |
6671 | ||
6672 | saw_declarator = true; | |
6673 | /* Parse the init-declarator. */ | |
6674 | cp_parser_init_declarator (parser, decl_specifiers, attributes, | |
6675 | access_checks, | |
6676 | function_definition_allowed_p, | |
6677 | /*member_p=*/false, | |
6678 | &function_definition_p); | |
6679 | /* Handle function definitions specially. */ | |
6680 | if (function_definition_p) | |
6681 | { | |
6682 | /* If the next token is a `,', then we are probably | |
6683 | processing something like: | |
6684 | ||
6685 | void f() {}, *p; | |
6686 | ||
6687 | which is erroneous. */ | |
6688 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
6689 | error ("mixing declarations and function-definitions is forbidden"); | |
6690 | /* Otherwise, we're done with the list of declarators. */ | |
6691 | else | |
6692 | return; | |
6693 | } | |
6694 | /* The next token should be either a `,' or a `;'. */ | |
6695 | token = cp_lexer_peek_token (parser->lexer); | |
6696 | /* If it's a `,', there are more declarators to come. */ | |
6697 | if (token->type == CPP_COMMA) | |
6698 | cp_lexer_consume_token (parser->lexer); | |
6699 | /* If it's a `;', we are done. */ | |
6700 | else if (token->type == CPP_SEMICOLON) | |
6701 | break; | |
6702 | /* Anything else is an error. */ | |
6703 | else | |
6704 | { | |
6705 | cp_parser_error (parser, "expected `,' or `;'"); | |
6706 | /* Skip tokens until we reach the end of the statement. */ | |
6707 | cp_parser_skip_to_end_of_statement (parser); | |
6708 | return; | |
6709 | } | |
6710 | /* After the first time around, a function-definition is not | |
6711 | allowed -- even if it was OK at first. For example: | |
6712 | ||
6713 | int i, f() {} | |
6714 | ||
6715 | is not valid. */ | |
6716 | function_definition_allowed_p = false; | |
6717 | } | |
6718 | ||
6719 | /* Issue an error message if no declarators are present, and the | |
6720 | decl-specifier-seq does not itself declare a class or | |
6721 | enumeration. */ | |
6722 | if (!saw_declarator) | |
6723 | { | |
6724 | if (cp_parser_declares_only_class_p (parser)) | |
6725 | shadow_tag (decl_specifiers); | |
6726 | /* Perform any deferred access checks. */ | |
6727 | cp_parser_perform_deferred_access_checks (access_checks); | |
6728 | } | |
6729 | ||
6730 | /* Consume the `;'. */ | |
6731 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
6732 | ||
6733 | /* Mark all the classes that appeared in the decl-specifier-seq as | |
6734 | having received a `;'. */ | |
6735 | note_list_got_semicolon (decl_specifiers); | |
6736 | } | |
6737 | ||
6738 | /* Parse a decl-specifier-seq. | |
6739 | ||
6740 | decl-specifier-seq: | |
6741 | decl-specifier-seq [opt] decl-specifier | |
6742 | ||
6743 | decl-specifier: | |
6744 | storage-class-specifier | |
6745 | type-specifier | |
6746 | function-specifier | |
6747 | friend | |
6748 | typedef | |
6749 | ||
6750 | GNU Extension: | |
6751 | ||
6752 | decl-specifier-seq: | |
6753 | decl-specifier-seq [opt] attributes | |
6754 | ||
6755 | Returns a TREE_LIST, giving the decl-specifiers in the order they | |
6756 | appear in the source code. The TREE_VALUE of each node is the | |
6757 | decl-specifier. For a keyword (such as `auto' or `friend'), the | |
6758 | TREE_VALUE is simply the correspoding TREE_IDENTIFIER. For the | |
6759 | representation of a type-specifier, see cp_parser_type_specifier. | |
6760 | ||
6761 | If there are attributes, they will be stored in *ATTRIBUTES, | |
6762 | represented as described above cp_parser_attributes. | |
6763 | ||
6764 | If FRIEND_IS_NOT_CLASS_P is non-NULL, and the `friend' specifier | |
6765 | appears, and the entity that will be a friend is not going to be a | |
6766 | class, then *FRIEND_IS_NOT_CLASS_P will be set to TRUE. Note that | |
6767 | even if *FRIEND_IS_NOT_CLASS_P is FALSE, the entity to which | |
6768 | friendship is granted might not be a class. */ | |
6769 | ||
6770 | static tree | |
6771 | cp_parser_decl_specifier_seq (parser, flags, attributes, | |
6772 | declares_class_or_enum) | |
6773 | cp_parser *parser; | |
6774 | cp_parser_flags flags; | |
6775 | tree *attributes; | |
6776 | bool *declares_class_or_enum; | |
6777 | { | |
6778 | tree decl_specs = NULL_TREE; | |
6779 | bool friend_p = false; | |
6780 | ||
6781 | /* Assume no class or enumeration type is declared. */ | |
6782 | *declares_class_or_enum = false; | |
6783 | ||
6784 | /* Assume there are no attributes. */ | |
6785 | *attributes = NULL_TREE; | |
6786 | ||
6787 | /* Keep reading specifiers until there are no more to read. */ | |
6788 | while (true) | |
6789 | { | |
6790 | tree decl_spec = NULL_TREE; | |
6791 | bool constructor_p; | |
6792 | cp_token *token; | |
6793 | ||
6794 | /* Peek at the next token. */ | |
6795 | token = cp_lexer_peek_token (parser->lexer); | |
6796 | /* Handle attributes. */ | |
6797 | if (token->keyword == RID_ATTRIBUTE) | |
6798 | { | |
6799 | /* Parse the attributes. */ | |
6800 | decl_spec = cp_parser_attributes_opt (parser); | |
6801 | /* Add them to the list. */ | |
6802 | *attributes = chainon (*attributes, decl_spec); | |
6803 | continue; | |
6804 | } | |
6805 | /* If the next token is an appropriate keyword, we can simply | |
6806 | add it to the list. */ | |
6807 | switch (token->keyword) | |
6808 | { | |
6809 | case RID_FRIEND: | |
6810 | /* decl-specifier: | |
6811 | friend */ | |
6812 | friend_p = true; | |
6813 | /* The representation of the specifier is simply the | |
6814 | appropriate TREE_IDENTIFIER node. */ | |
6815 | decl_spec = token->value; | |
6816 | /* Consume the token. */ | |
6817 | cp_lexer_consume_token (parser->lexer); | |
6818 | break; | |
6819 | ||
6820 | /* function-specifier: | |
6821 | inline | |
6822 | virtual | |
6823 | explicit */ | |
6824 | case RID_INLINE: | |
6825 | case RID_VIRTUAL: | |
6826 | case RID_EXPLICIT: | |
6827 | decl_spec = cp_parser_function_specifier_opt (parser); | |
6828 | break; | |
6829 | ||
6830 | /* decl-specifier: | |
6831 | typedef */ | |
6832 | case RID_TYPEDEF: | |
6833 | /* The representation of the specifier is simply the | |
6834 | appropriate TREE_IDENTIFIER node. */ | |
6835 | decl_spec = token->value; | |
6836 | /* Consume the token. */ | |
6837 | cp_lexer_consume_token (parser->lexer); | |
6838 | break; | |
6839 | ||
6840 | /* storage-class-specifier: | |
6841 | auto | |
6842 | register | |
6843 | static | |
6844 | extern | |
6845 | mutable | |
6846 | ||
6847 | GNU Extension: | |
6848 | thread */ | |
6849 | case RID_AUTO: | |
6850 | case RID_REGISTER: | |
6851 | case RID_STATIC: | |
6852 | case RID_EXTERN: | |
6853 | case RID_MUTABLE: | |
6854 | case RID_THREAD: | |
6855 | decl_spec = cp_parser_storage_class_specifier_opt (parser); | |
6856 | break; | |
6857 | ||
6858 | default: | |
6859 | break; | |
6860 | } | |
6861 | ||
6862 | /* Constructors are a special case. The `S' in `S()' is not a | |
6863 | decl-specifier; it is the beginning of the declarator. */ | |
6864 | constructor_p = (!decl_spec | |
6865 | && cp_parser_constructor_declarator_p (parser, | |
6866 | friend_p)); | |
6867 | ||
6868 | /* If we don't have a DECL_SPEC yet, then we must be looking at | |
6869 | a type-specifier. */ | |
6870 | if (!decl_spec && !constructor_p) | |
6871 | { | |
6872 | bool decl_spec_declares_class_or_enum; | |
6873 | bool is_cv_qualifier; | |
6874 | ||
6875 | decl_spec | |
6876 | = cp_parser_type_specifier (parser, flags, | |
6877 | friend_p, | |
6878 | /*is_declaration=*/true, | |
6879 | &decl_spec_declares_class_or_enum, | |
6880 | &is_cv_qualifier); | |
6881 | ||
6882 | *declares_class_or_enum |= decl_spec_declares_class_or_enum; | |
6883 | ||
6884 | /* If this type-specifier referenced a user-defined type | |
6885 | (a typedef, class-name, etc.), then we can't allow any | |
6886 | more such type-specifiers henceforth. | |
6887 | ||
6888 | [dcl.spec] | |
6889 | ||
6890 | The longest sequence of decl-specifiers that could | |
6891 | possibly be a type name is taken as the | |
6892 | decl-specifier-seq of a declaration. The sequence shall | |
6893 | be self-consistent as described below. | |
6894 | ||
6895 | [dcl.type] | |
6896 | ||
6897 | As a general rule, at most one type-specifier is allowed | |
6898 | in the complete decl-specifier-seq of a declaration. The | |
6899 | only exceptions are the following: | |
6900 | ||
6901 | -- const or volatile can be combined with any other | |
6902 | type-specifier. | |
6903 | ||
6904 | -- signed or unsigned can be combined with char, long, | |
6905 | short, or int. | |
6906 | ||
6907 | -- .. | |
6908 | ||
6909 | Example: | |
6910 | ||
6911 | typedef char* Pc; | |
6912 | void g (const int Pc); | |
6913 | ||
6914 | Here, Pc is *not* part of the decl-specifier seq; it's | |
6915 | the declarator. Therefore, once we see a type-specifier | |
6916 | (other than a cv-qualifier), we forbid any additional | |
6917 | user-defined types. We *do* still allow things like `int | |
6918 | int' to be considered a decl-specifier-seq, and issue the | |
6919 | error message later. */ | |
6920 | if (decl_spec && !is_cv_qualifier) | |
6921 | flags |= CP_PARSER_FLAGS_NO_USER_DEFINED_TYPES; | |
6922 | } | |
6923 | ||
6924 | /* If we still do not have a DECL_SPEC, then there are no more | |
6925 | decl-specifiers. */ | |
6926 | if (!decl_spec) | |
6927 | { | |
6928 | /* Issue an error message, unless the entire construct was | |
6929 | optional. */ | |
6930 | if (!(flags & CP_PARSER_FLAGS_OPTIONAL)) | |
6931 | { | |
6932 | cp_parser_error (parser, "expected decl specifier"); | |
6933 | return error_mark_node; | |
6934 | } | |
6935 | ||
6936 | break; | |
6937 | } | |
6938 | ||
6939 | /* Add the DECL_SPEC to the list of specifiers. */ | |
6940 | decl_specs = tree_cons (NULL_TREE, decl_spec, decl_specs); | |
6941 | ||
6942 | /* After we see one decl-specifier, further decl-specifiers are | |
6943 | always optional. */ | |
6944 | flags |= CP_PARSER_FLAGS_OPTIONAL; | |
6945 | } | |
6946 | ||
6947 | /* We have built up the DECL_SPECS in reverse order. Return them in | |
6948 | the correct order. */ | |
6949 | return nreverse (decl_specs); | |
6950 | } | |
6951 | ||
6952 | /* Parse an (optional) storage-class-specifier. | |
6953 | ||
6954 | storage-class-specifier: | |
6955 | auto | |
6956 | register | |
6957 | static | |
6958 | extern | |
6959 | mutable | |
6960 | ||
6961 | GNU Extension: | |
6962 | ||
6963 | storage-class-specifier: | |
6964 | thread | |
6965 | ||
6966 | Returns an IDENTIFIER_NODE corresponding to the keyword used. */ | |
6967 | ||
6968 | static tree | |
6969 | cp_parser_storage_class_specifier_opt (parser) | |
6970 | cp_parser *parser; | |
6971 | { | |
6972 | switch (cp_lexer_peek_token (parser->lexer)->keyword) | |
6973 | { | |
6974 | case RID_AUTO: | |
6975 | case RID_REGISTER: | |
6976 | case RID_STATIC: | |
6977 | case RID_EXTERN: | |
6978 | case RID_MUTABLE: | |
6979 | case RID_THREAD: | |
6980 | /* Consume the token. */ | |
6981 | return cp_lexer_consume_token (parser->lexer)->value; | |
6982 | ||
6983 | default: | |
6984 | return NULL_TREE; | |
6985 | } | |
6986 | } | |
6987 | ||
6988 | /* Parse an (optional) function-specifier. | |
6989 | ||
6990 | function-specifier: | |
6991 | inline | |
6992 | virtual | |
6993 | explicit | |
6994 | ||
6995 | Returns an IDENTIFIER_NODE corresponding to the keyword used. */ | |
6996 | ||
6997 | static tree | |
6998 | cp_parser_function_specifier_opt (parser) | |
6999 | cp_parser *parser; | |
7000 | { | |
7001 | switch (cp_lexer_peek_token (parser->lexer)->keyword) | |
7002 | { | |
7003 | case RID_INLINE: | |
7004 | case RID_VIRTUAL: | |
7005 | case RID_EXPLICIT: | |
7006 | /* Consume the token. */ | |
7007 | return cp_lexer_consume_token (parser->lexer)->value; | |
7008 | ||
7009 | default: | |
7010 | return NULL_TREE; | |
7011 | } | |
7012 | } | |
7013 | ||
7014 | /* Parse a linkage-specification. | |
7015 | ||
7016 | linkage-specification: | |
7017 | extern string-literal { declaration-seq [opt] } | |
7018 | extern string-literal declaration */ | |
7019 | ||
7020 | static void | |
7021 | cp_parser_linkage_specification (parser) | |
7022 | cp_parser *parser; | |
7023 | { | |
7024 | cp_token *token; | |
7025 | tree linkage; | |
7026 | ||
7027 | /* Look for the `extern' keyword. */ | |
7028 | cp_parser_require_keyword (parser, RID_EXTERN, "`extern'"); | |
7029 | ||
7030 | /* Peek at the next token. */ | |
7031 | token = cp_lexer_peek_token (parser->lexer); | |
7032 | /* If it's not a string-literal, then there's a problem. */ | |
7033 | if (!cp_parser_is_string_literal (token)) | |
7034 | { | |
7035 | cp_parser_error (parser, "expected language-name"); | |
7036 | return; | |
7037 | } | |
7038 | /* Consume the token. */ | |
7039 | cp_lexer_consume_token (parser->lexer); | |
7040 | ||
7041 | /* Transform the literal into an identifier. If the literal is a | |
7042 | wide-character string, or contains embedded NULs, then we can't | |
7043 | handle it as the user wants. */ | |
7044 | if (token->type == CPP_WSTRING | |
7045 | || (strlen (TREE_STRING_POINTER (token->value)) | |
7046 | != (size_t) (TREE_STRING_LENGTH (token->value) - 1))) | |
7047 | { | |
7048 | cp_parser_error (parser, "invalid linkage-specification"); | |
7049 | /* Assume C++ linkage. */ | |
7050 | linkage = get_identifier ("c++"); | |
7051 | } | |
7052 | /* If it's a simple string constant, things are easier. */ | |
7053 | else | |
7054 | linkage = get_identifier (TREE_STRING_POINTER (token->value)); | |
7055 | ||
7056 | /* We're now using the new linkage. */ | |
7057 | push_lang_context (linkage); | |
7058 | ||
7059 | /* If the next token is a `{', then we're using the first | |
7060 | production. */ | |
7061 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)) | |
7062 | { | |
7063 | /* Consume the `{' token. */ | |
7064 | cp_lexer_consume_token (parser->lexer); | |
7065 | /* Parse the declarations. */ | |
7066 | cp_parser_declaration_seq_opt (parser); | |
7067 | /* Look for the closing `}'. */ | |
7068 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
7069 | } | |
7070 | /* Otherwise, there's just one declaration. */ | |
7071 | else | |
7072 | { | |
7073 | bool saved_in_unbraced_linkage_specification_p; | |
7074 | ||
7075 | saved_in_unbraced_linkage_specification_p | |
7076 | = parser->in_unbraced_linkage_specification_p; | |
7077 | parser->in_unbraced_linkage_specification_p = true; | |
7078 | have_extern_spec = true; | |
7079 | cp_parser_declaration (parser); | |
7080 | have_extern_spec = false; | |
7081 | parser->in_unbraced_linkage_specification_p | |
7082 | = saved_in_unbraced_linkage_specification_p; | |
7083 | } | |
7084 | ||
7085 | /* We're done with the linkage-specification. */ | |
7086 | pop_lang_context (); | |
7087 | } | |
7088 | ||
7089 | /* Special member functions [gram.special] */ | |
7090 | ||
7091 | /* Parse a conversion-function-id. | |
7092 | ||
7093 | conversion-function-id: | |
7094 | operator conversion-type-id | |
7095 | ||
7096 | Returns an IDENTIFIER_NODE representing the operator. */ | |
7097 | ||
7098 | static tree | |
7099 | cp_parser_conversion_function_id (parser) | |
7100 | cp_parser *parser; | |
7101 | { | |
7102 | tree type; | |
7103 | tree saved_scope; | |
7104 | tree saved_qualifying_scope; | |
7105 | tree saved_object_scope; | |
7106 | ||
7107 | /* Look for the `operator' token. */ | |
7108 | if (!cp_parser_require_keyword (parser, RID_OPERATOR, "`operator'")) | |
7109 | return error_mark_node; | |
7110 | /* When we parse the conversion-type-id, the current scope will be | |
7111 | reset. However, we need that information in able to look up the | |
7112 | conversion function later, so we save it here. */ | |
7113 | saved_scope = parser->scope; | |
7114 | saved_qualifying_scope = parser->qualifying_scope; | |
7115 | saved_object_scope = parser->object_scope; | |
7116 | /* We must enter the scope of the class so that the names of | |
7117 | entities declared within the class are available in the | |
7118 | conversion-type-id. For example, consider: | |
7119 | ||
7120 | struct S { | |
7121 | typedef int I; | |
7122 | operator I(); | |
7123 | }; | |
7124 | ||
7125 | S::operator I() { ... } | |
7126 | ||
7127 | In order to see that `I' is a type-name in the definition, we | |
7128 | must be in the scope of `S'. */ | |
7129 | if (saved_scope) | |
7130 | push_scope (saved_scope); | |
7131 | /* Parse the conversion-type-id. */ | |
7132 | type = cp_parser_conversion_type_id (parser); | |
7133 | /* Leave the scope of the class, if any. */ | |
7134 | if (saved_scope) | |
7135 | pop_scope (saved_scope); | |
7136 | /* Restore the saved scope. */ | |
7137 | parser->scope = saved_scope; | |
7138 | parser->qualifying_scope = saved_qualifying_scope; | |
7139 | parser->object_scope = saved_object_scope; | |
7140 | /* If the TYPE is invalid, indicate failure. */ | |
7141 | if (type == error_mark_node) | |
7142 | return error_mark_node; | |
7143 | return mangle_conv_op_name_for_type (type); | |
7144 | } | |
7145 | ||
7146 | /* Parse a conversion-type-id: | |
7147 | ||
7148 | conversion-type-id: | |
7149 | type-specifier-seq conversion-declarator [opt] | |
7150 | ||
7151 | Returns the TYPE specified. */ | |
7152 | ||
7153 | static tree | |
7154 | cp_parser_conversion_type_id (parser) | |
7155 | cp_parser *parser; | |
7156 | { | |
7157 | tree attributes; | |
7158 | tree type_specifiers; | |
7159 | tree declarator; | |
7160 | ||
7161 | /* Parse the attributes. */ | |
7162 | attributes = cp_parser_attributes_opt (parser); | |
7163 | /* Parse the type-specifiers. */ | |
7164 | type_specifiers = cp_parser_type_specifier_seq (parser); | |
7165 | /* If that didn't work, stop. */ | |
7166 | if (type_specifiers == error_mark_node) | |
7167 | return error_mark_node; | |
7168 | /* Parse the conversion-declarator. */ | |
7169 | declarator = cp_parser_conversion_declarator_opt (parser); | |
7170 | ||
7171 | return grokdeclarator (declarator, type_specifiers, TYPENAME, | |
7172 | /*initialized=*/0, &attributes); | |
7173 | } | |
7174 | ||
7175 | /* Parse an (optional) conversion-declarator. | |
7176 | ||
7177 | conversion-declarator: | |
7178 | ptr-operator conversion-declarator [opt] | |
7179 | ||
7180 | Returns a representation of the declarator. See | |
7181 | cp_parser_declarator for details. */ | |
7182 | ||
7183 | static tree | |
7184 | cp_parser_conversion_declarator_opt (parser) | |
7185 | cp_parser *parser; | |
7186 | { | |
7187 | enum tree_code code; | |
7188 | tree class_type; | |
7189 | tree cv_qualifier_seq; | |
7190 | ||
7191 | /* We don't know if there's a ptr-operator next, or not. */ | |
7192 | cp_parser_parse_tentatively (parser); | |
7193 | /* Try the ptr-operator. */ | |
7194 | code = cp_parser_ptr_operator (parser, &class_type, | |
7195 | &cv_qualifier_seq); | |
7196 | /* If it worked, look for more conversion-declarators. */ | |
7197 | if (cp_parser_parse_definitely (parser)) | |
7198 | { | |
7199 | tree declarator; | |
7200 | ||
7201 | /* Parse another optional declarator. */ | |
7202 | declarator = cp_parser_conversion_declarator_opt (parser); | |
7203 | ||
7204 | /* Create the representation of the declarator. */ | |
7205 | if (code == INDIRECT_REF) | |
7206 | declarator = make_pointer_declarator (cv_qualifier_seq, | |
7207 | declarator); | |
7208 | else | |
7209 | declarator = make_reference_declarator (cv_qualifier_seq, | |
7210 | declarator); | |
7211 | ||
7212 | /* Handle the pointer-to-member case. */ | |
7213 | if (class_type) | |
7214 | declarator = build_nt (SCOPE_REF, class_type, declarator); | |
7215 | ||
7216 | return declarator; | |
7217 | } | |
7218 | ||
7219 | return NULL_TREE; | |
7220 | } | |
7221 | ||
7222 | /* Parse an (optional) ctor-initializer. | |
7223 | ||
7224 | ctor-initializer: | |
7225 | : mem-initializer-list | |
7226 | ||
7227 | Returns TRUE iff the ctor-initializer was actually present. */ | |
7228 | ||
7229 | static bool | |
7230 | cp_parser_ctor_initializer_opt (parser) | |
7231 | cp_parser *parser; | |
7232 | { | |
7233 | /* If the next token is not a `:', then there is no | |
7234 | ctor-initializer. */ | |
7235 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COLON)) | |
7236 | { | |
7237 | /* Do default initialization of any bases and members. */ | |
7238 | if (DECL_CONSTRUCTOR_P (current_function_decl)) | |
7239 | finish_mem_initializers (NULL_TREE); | |
7240 | ||
7241 | return false; | |
7242 | } | |
7243 | ||
7244 | /* Consume the `:' token. */ | |
7245 | cp_lexer_consume_token (parser->lexer); | |
7246 | /* And the mem-initializer-list. */ | |
7247 | cp_parser_mem_initializer_list (parser); | |
7248 | ||
7249 | return true; | |
7250 | } | |
7251 | ||
7252 | /* Parse a mem-initializer-list. | |
7253 | ||
7254 | mem-initializer-list: | |
7255 | mem-initializer | |
7256 | mem-initializer , mem-initializer-list */ | |
7257 | ||
7258 | static void | |
7259 | cp_parser_mem_initializer_list (parser) | |
7260 | cp_parser *parser; | |
7261 | { | |
7262 | tree mem_initializer_list = NULL_TREE; | |
7263 | ||
7264 | /* Let the semantic analysis code know that we are starting the | |
7265 | mem-initializer-list. */ | |
7266 | begin_mem_initializers (); | |
7267 | ||
7268 | /* Loop through the list. */ | |
7269 | while (true) | |
7270 | { | |
7271 | tree mem_initializer; | |
7272 | ||
7273 | /* Parse the mem-initializer. */ | |
7274 | mem_initializer = cp_parser_mem_initializer (parser); | |
7275 | /* Add it to the list, unless it was erroneous. */ | |
7276 | if (mem_initializer) | |
7277 | { | |
7278 | TREE_CHAIN (mem_initializer) = mem_initializer_list; | |
7279 | mem_initializer_list = mem_initializer; | |
7280 | } | |
7281 | /* If the next token is not a `,', we're done. */ | |
7282 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
7283 | break; | |
7284 | /* Consume the `,' token. */ | |
7285 | cp_lexer_consume_token (parser->lexer); | |
7286 | } | |
7287 | ||
7288 | /* Perform semantic analysis. */ | |
7289 | finish_mem_initializers (mem_initializer_list); | |
7290 | } | |
7291 | ||
7292 | /* Parse a mem-initializer. | |
7293 | ||
7294 | mem-initializer: | |
7295 | mem-initializer-id ( expression-list [opt] ) | |
7296 | ||
7297 | GNU extension: | |
7298 | ||
7299 | mem-initializer: | |
7300 | ( expresion-list [opt] ) | |
7301 | ||
7302 | Returns a TREE_LIST. The TREE_PURPOSE is the TYPE (for a base | |
7303 | class) or FIELD_DECL (for a non-static data member) to initialize; | |
7304 | the TREE_VALUE is the expression-list. */ | |
7305 | ||
7306 | static tree | |
7307 | cp_parser_mem_initializer (parser) | |
7308 | cp_parser *parser; | |
7309 | { | |
7310 | tree mem_initializer_id; | |
7311 | tree expression_list; | |
7312 | ||
7313 | /* Find out what is being initialized. */ | |
7314 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
7315 | { | |
7316 | pedwarn ("anachronistic old-style base class initializer"); | |
7317 | mem_initializer_id = NULL_TREE; | |
7318 | } | |
7319 | else | |
7320 | mem_initializer_id = cp_parser_mem_initializer_id (parser); | |
7321 | /* Look for the opening `('. */ | |
7322 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
7323 | /* Parse the expression-list. */ | |
7324 | if (cp_lexer_next_token_is_not (parser->lexer, | |
7325 | CPP_CLOSE_PAREN)) | |
7326 | expression_list = cp_parser_expression_list (parser); | |
7327 | else | |
7328 | expression_list = void_type_node; | |
7329 | /* Look for the closing `)'. */ | |
7330 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
7331 | ||
7332 | return expand_member_init (mem_initializer_id, | |
7333 | expression_list); | |
7334 | } | |
7335 | ||
7336 | /* Parse a mem-initializer-id. | |
7337 | ||
7338 | mem-initializer-id: | |
7339 | :: [opt] nested-name-specifier [opt] class-name | |
7340 | identifier | |
7341 | ||
7342 | Returns a TYPE indicating the class to be initializer for the first | |
7343 | production. Returns an IDENTIFIER_NODE indicating the data member | |
7344 | to be initialized for the second production. */ | |
7345 | ||
7346 | static tree | |
7347 | cp_parser_mem_initializer_id (parser) | |
7348 | cp_parser *parser; | |
7349 | { | |
7350 | bool global_scope_p; | |
7351 | bool nested_name_specifier_p; | |
7352 | tree id; | |
7353 | ||
7354 | /* Look for the optional `::' operator. */ | |
7355 | global_scope_p | |
7356 | = (cp_parser_global_scope_opt (parser, | |
7357 | /*current_scope_valid_p=*/false) | |
7358 | != NULL_TREE); | |
7359 | /* Look for the optional nested-name-specifier. The simplest way to | |
7360 | implement: | |
7361 | ||
7362 | [temp.res] | |
7363 | ||
7364 | The keyword `typename' is not permitted in a base-specifier or | |
7365 | mem-initializer; in these contexts a qualified name that | |
7366 | depends on a template-parameter is implicitly assumed to be a | |
7367 | type name. | |
7368 | ||
7369 | is to assume that we have seen the `typename' keyword at this | |
7370 | point. */ | |
7371 | nested_name_specifier_p | |
7372 | = (cp_parser_nested_name_specifier_opt (parser, | |
7373 | /*typename_keyword_p=*/true, | |
7374 | /*check_dependency_p=*/true, | |
7375 | /*type_p=*/true) | |
7376 | != NULL_TREE); | |
7377 | /* If there is a `::' operator or a nested-name-specifier, then we | |
7378 | are definitely looking for a class-name. */ | |
7379 | if (global_scope_p || nested_name_specifier_p) | |
7380 | return cp_parser_class_name (parser, | |
7381 | /*typename_keyword_p=*/true, | |
7382 | /*template_keyword_p=*/false, | |
7383 | /*type_p=*/false, | |
7384 | /*check_access_p=*/true, | |
7385 | /*check_dependency_p=*/true, | |
7386 | /*class_head_p=*/false); | |
7387 | /* Otherwise, we could also be looking for an ordinary identifier. */ | |
7388 | cp_parser_parse_tentatively (parser); | |
7389 | /* Try a class-name. */ | |
7390 | id = cp_parser_class_name (parser, | |
7391 | /*typename_keyword_p=*/true, | |
7392 | /*template_keyword_p=*/false, | |
7393 | /*type_p=*/false, | |
7394 | /*check_access_p=*/true, | |
7395 | /*check_dependency_p=*/true, | |
7396 | /*class_head_p=*/false); | |
7397 | /* If we found one, we're done. */ | |
7398 | if (cp_parser_parse_definitely (parser)) | |
7399 | return id; | |
7400 | /* Otherwise, look for an ordinary identifier. */ | |
7401 | return cp_parser_identifier (parser); | |
7402 | } | |
7403 | ||
7404 | /* Overloading [gram.over] */ | |
7405 | ||
7406 | /* Parse an operator-function-id. | |
7407 | ||
7408 | operator-function-id: | |
7409 | operator operator | |
7410 | ||
7411 | Returns an IDENTIFIER_NODE for the operator which is a | |
7412 | human-readable spelling of the identifier, e.g., `operator +'. */ | |
7413 | ||
7414 | static tree | |
7415 | cp_parser_operator_function_id (parser) | |
7416 | cp_parser *parser; | |
7417 | { | |
7418 | /* Look for the `operator' keyword. */ | |
7419 | if (!cp_parser_require_keyword (parser, RID_OPERATOR, "`operator'")) | |
7420 | return error_mark_node; | |
7421 | /* And then the name of the operator itself. */ | |
7422 | return cp_parser_operator (parser); | |
7423 | } | |
7424 | ||
7425 | /* Parse an operator. | |
7426 | ||
7427 | operator: | |
7428 | new delete new[] delete[] + - * / % ^ & | ~ ! = < > | |
7429 | += -= *= /= %= ^= &= |= << >> >>= <<= == != <= >= && | |
7430 | || ++ -- , ->* -> () [] | |
7431 | ||
7432 | GNU Extensions: | |
7433 | ||
7434 | operator: | |
7435 | <? >? <?= >?= | |
7436 | ||
7437 | Returns an IDENTIFIER_NODE for the operator which is a | |
7438 | human-readable spelling of the identifier, e.g., `operator +'. */ | |
7439 | ||
7440 | static tree | |
7441 | cp_parser_operator (parser) | |
7442 | cp_parser *parser; | |
7443 | { | |
7444 | tree id = NULL_TREE; | |
7445 | cp_token *token; | |
7446 | ||
7447 | /* Peek at the next token. */ | |
7448 | token = cp_lexer_peek_token (parser->lexer); | |
7449 | /* Figure out which operator we have. */ | |
7450 | switch (token->type) | |
7451 | { | |
7452 | case CPP_KEYWORD: | |
7453 | { | |
7454 | enum tree_code op; | |
7455 | ||
7456 | /* The keyword should be either `new' or `delete'. */ | |
7457 | if (token->keyword == RID_NEW) | |
7458 | op = NEW_EXPR; | |
7459 | else if (token->keyword == RID_DELETE) | |
7460 | op = DELETE_EXPR; | |
7461 | else | |
7462 | break; | |
7463 | ||
7464 | /* Consume the `new' or `delete' token. */ | |
7465 | cp_lexer_consume_token (parser->lexer); | |
7466 | ||
7467 | /* Peek at the next token. */ | |
7468 | token = cp_lexer_peek_token (parser->lexer); | |
7469 | /* If it's a `[' token then this is the array variant of the | |
7470 | operator. */ | |
7471 | if (token->type == CPP_OPEN_SQUARE) | |
7472 | { | |
7473 | /* Consume the `[' token. */ | |
7474 | cp_lexer_consume_token (parser->lexer); | |
7475 | /* Look for the `]' token. */ | |
7476 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
7477 | id = ansi_opname (op == NEW_EXPR | |
7478 | ? VEC_NEW_EXPR : VEC_DELETE_EXPR); | |
7479 | } | |
7480 | /* Otherwise, we have the non-array variant. */ | |
7481 | else | |
7482 | id = ansi_opname (op); | |
7483 | ||
7484 | return id; | |
7485 | } | |
7486 | ||
7487 | case CPP_PLUS: | |
7488 | id = ansi_opname (PLUS_EXPR); | |
7489 | break; | |
7490 | ||
7491 | case CPP_MINUS: | |
7492 | id = ansi_opname (MINUS_EXPR); | |
7493 | break; | |
7494 | ||
7495 | case CPP_MULT: | |
7496 | id = ansi_opname (MULT_EXPR); | |
7497 | break; | |
7498 | ||
7499 | case CPP_DIV: | |
7500 | id = ansi_opname (TRUNC_DIV_EXPR); | |
7501 | break; | |
7502 | ||
7503 | case CPP_MOD: | |
7504 | id = ansi_opname (TRUNC_MOD_EXPR); | |
7505 | break; | |
7506 | ||
7507 | case CPP_XOR: | |
7508 | id = ansi_opname (BIT_XOR_EXPR); | |
7509 | break; | |
7510 | ||
7511 | case CPP_AND: | |
7512 | id = ansi_opname (BIT_AND_EXPR); | |
7513 | break; | |
7514 | ||
7515 | case CPP_OR: | |
7516 | id = ansi_opname (BIT_IOR_EXPR); | |
7517 | break; | |
7518 | ||
7519 | case CPP_COMPL: | |
7520 | id = ansi_opname (BIT_NOT_EXPR); | |
7521 | break; | |
7522 | ||
7523 | case CPP_NOT: | |
7524 | id = ansi_opname (TRUTH_NOT_EXPR); | |
7525 | break; | |
7526 | ||
7527 | case CPP_EQ: | |
7528 | id = ansi_assopname (NOP_EXPR); | |
7529 | break; | |
7530 | ||
7531 | case CPP_LESS: | |
7532 | id = ansi_opname (LT_EXPR); | |
7533 | break; | |
7534 | ||
7535 | case CPP_GREATER: | |
7536 | id = ansi_opname (GT_EXPR); | |
7537 | break; | |
7538 | ||
7539 | case CPP_PLUS_EQ: | |
7540 | id = ansi_assopname (PLUS_EXPR); | |
7541 | break; | |
7542 | ||
7543 | case CPP_MINUS_EQ: | |
7544 | id = ansi_assopname (MINUS_EXPR); | |
7545 | break; | |
7546 | ||
7547 | case CPP_MULT_EQ: | |
7548 | id = ansi_assopname (MULT_EXPR); | |
7549 | break; | |
7550 | ||
7551 | case CPP_DIV_EQ: | |
7552 | id = ansi_assopname (TRUNC_DIV_EXPR); | |
7553 | break; | |
7554 | ||
7555 | case CPP_MOD_EQ: | |
7556 | id = ansi_assopname (TRUNC_MOD_EXPR); | |
7557 | break; | |
7558 | ||
7559 | case CPP_XOR_EQ: | |
7560 | id = ansi_assopname (BIT_XOR_EXPR); | |
7561 | break; | |
7562 | ||
7563 | case CPP_AND_EQ: | |
7564 | id = ansi_assopname (BIT_AND_EXPR); | |
7565 | break; | |
7566 | ||
7567 | case CPP_OR_EQ: | |
7568 | id = ansi_assopname (BIT_IOR_EXPR); | |
7569 | break; | |
7570 | ||
7571 | case CPP_LSHIFT: | |
7572 | id = ansi_opname (LSHIFT_EXPR); | |
7573 | break; | |
7574 | ||
7575 | case CPP_RSHIFT: | |
7576 | id = ansi_opname (RSHIFT_EXPR); | |
7577 | break; | |
7578 | ||
7579 | case CPP_LSHIFT_EQ: | |
7580 | id = ansi_assopname (LSHIFT_EXPR); | |
7581 | break; | |
7582 | ||
7583 | case CPP_RSHIFT_EQ: | |
7584 | id = ansi_assopname (RSHIFT_EXPR); | |
7585 | break; | |
7586 | ||
7587 | case CPP_EQ_EQ: | |
7588 | id = ansi_opname (EQ_EXPR); | |
7589 | break; | |
7590 | ||
7591 | case CPP_NOT_EQ: | |
7592 | id = ansi_opname (NE_EXPR); | |
7593 | break; | |
7594 | ||
7595 | case CPP_LESS_EQ: | |
7596 | id = ansi_opname (LE_EXPR); | |
7597 | break; | |
7598 | ||
7599 | case CPP_GREATER_EQ: | |
7600 | id = ansi_opname (GE_EXPR); | |
7601 | break; | |
7602 | ||
7603 | case CPP_AND_AND: | |
7604 | id = ansi_opname (TRUTH_ANDIF_EXPR); | |
7605 | break; | |
7606 | ||
7607 | case CPP_OR_OR: | |
7608 | id = ansi_opname (TRUTH_ORIF_EXPR); | |
7609 | break; | |
7610 | ||
7611 | case CPP_PLUS_PLUS: | |
7612 | id = ansi_opname (POSTINCREMENT_EXPR); | |
7613 | break; | |
7614 | ||
7615 | case CPP_MINUS_MINUS: | |
7616 | id = ansi_opname (PREDECREMENT_EXPR); | |
7617 | break; | |
7618 | ||
7619 | case CPP_COMMA: | |
7620 | id = ansi_opname (COMPOUND_EXPR); | |
7621 | break; | |
7622 | ||
7623 | case CPP_DEREF_STAR: | |
7624 | id = ansi_opname (MEMBER_REF); | |
7625 | break; | |
7626 | ||
7627 | case CPP_DEREF: | |
7628 | id = ansi_opname (COMPONENT_REF); | |
7629 | break; | |
7630 | ||
7631 | case CPP_OPEN_PAREN: | |
7632 | /* Consume the `('. */ | |
7633 | cp_lexer_consume_token (parser->lexer); | |
7634 | /* Look for the matching `)'. */ | |
7635 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
7636 | return ansi_opname (CALL_EXPR); | |
7637 | ||
7638 | case CPP_OPEN_SQUARE: | |
7639 | /* Consume the `['. */ | |
7640 | cp_lexer_consume_token (parser->lexer); | |
7641 | /* Look for the matching `]'. */ | |
7642 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
7643 | return ansi_opname (ARRAY_REF); | |
7644 | ||
7645 | /* Extensions. */ | |
7646 | case CPP_MIN: | |
7647 | id = ansi_opname (MIN_EXPR); | |
7648 | break; | |
7649 | ||
7650 | case CPP_MAX: | |
7651 | id = ansi_opname (MAX_EXPR); | |
7652 | break; | |
7653 | ||
7654 | case CPP_MIN_EQ: | |
7655 | id = ansi_assopname (MIN_EXPR); | |
7656 | break; | |
7657 | ||
7658 | case CPP_MAX_EQ: | |
7659 | id = ansi_assopname (MAX_EXPR); | |
7660 | break; | |
7661 | ||
7662 | default: | |
7663 | /* Anything else is an error. */ | |
7664 | break; | |
7665 | } | |
7666 | ||
7667 | /* If we have selected an identifier, we need to consume the | |
7668 | operator token. */ | |
7669 | if (id) | |
7670 | cp_lexer_consume_token (parser->lexer); | |
7671 | /* Otherwise, no valid operator name was present. */ | |
7672 | else | |
7673 | { | |
7674 | cp_parser_error (parser, "expected operator"); | |
7675 | id = error_mark_node; | |
7676 | } | |
7677 | ||
7678 | return id; | |
7679 | } | |
7680 | ||
7681 | /* Parse a template-declaration. | |
7682 | ||
7683 | template-declaration: | |
7684 | export [opt] template < template-parameter-list > declaration | |
7685 | ||
7686 | If MEMBER_P is TRUE, this template-declaration occurs within a | |
7687 | class-specifier. | |
7688 | ||
7689 | The grammar rule given by the standard isn't correct. What | |
7690 | is really meant is: | |
7691 | ||
7692 | template-declaration: | |
7693 | export [opt] template-parameter-list-seq | |
7694 | decl-specifier-seq [opt] init-declarator [opt] ; | |
7695 | export [opt] template-parameter-list-seq | |
7696 | function-definition | |
7697 | ||
7698 | template-parameter-list-seq: | |
7699 | template-parameter-list-seq [opt] | |
7700 | template < template-parameter-list > */ | |
7701 | ||
7702 | static void | |
7703 | cp_parser_template_declaration (parser, member_p) | |
7704 | cp_parser *parser; | |
7705 | bool member_p; | |
7706 | { | |
7707 | /* Check for `export'. */ | |
7708 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_EXPORT)) | |
7709 | { | |
7710 | /* Consume the `export' token. */ | |
7711 | cp_lexer_consume_token (parser->lexer); | |
7712 | /* Warn that we do not support `export'. */ | |
7713 | warning ("keyword `export' not implemented, and will be ignored"); | |
7714 | } | |
7715 | ||
7716 | cp_parser_template_declaration_after_export (parser, member_p); | |
7717 | } | |
7718 | ||
7719 | /* Parse a template-parameter-list. | |
7720 | ||
7721 | template-parameter-list: | |
7722 | template-parameter | |
7723 | template-parameter-list , template-parameter | |
7724 | ||
7725 | Returns a TREE_LIST. Each node represents a template parameter. | |
7726 | The nodes are connected via their TREE_CHAINs. */ | |
7727 | ||
7728 | static tree | |
7729 | cp_parser_template_parameter_list (parser) | |
7730 | cp_parser *parser; | |
7731 | { | |
7732 | tree parameter_list = NULL_TREE; | |
7733 | ||
7734 | while (true) | |
7735 | { | |
7736 | tree parameter; | |
7737 | cp_token *token; | |
7738 | ||
7739 | /* Parse the template-parameter. */ | |
7740 | parameter = cp_parser_template_parameter (parser); | |
7741 | /* Add it to the list. */ | |
7742 | parameter_list = process_template_parm (parameter_list, | |
7743 | parameter); | |
7744 | ||
7745 | /* Peek at the next token. */ | |
7746 | token = cp_lexer_peek_token (parser->lexer); | |
7747 | /* If it's not a `,', we're done. */ | |
7748 | if (token->type != CPP_COMMA) | |
7749 | break; | |
7750 | /* Otherwise, consume the `,' token. */ | |
7751 | cp_lexer_consume_token (parser->lexer); | |
7752 | } | |
7753 | ||
7754 | return parameter_list; | |
7755 | } | |
7756 | ||
7757 | /* Parse a template-parameter. | |
7758 | ||
7759 | template-parameter: | |
7760 | type-parameter | |
7761 | parameter-declaration | |
7762 | ||
7763 | Returns a TREE_LIST. The TREE_VALUE represents the parameter. The | |
7764 | TREE_PURPOSE is the default value, if any. */ | |
7765 | ||
7766 | static tree | |
7767 | cp_parser_template_parameter (parser) | |
7768 | cp_parser *parser; | |
7769 | { | |
7770 | cp_token *token; | |
7771 | ||
7772 | /* Peek at the next token. */ | |
7773 | token = cp_lexer_peek_token (parser->lexer); | |
7774 | /* If it is `class' or `template', we have a type-parameter. */ | |
7775 | if (token->keyword == RID_TEMPLATE) | |
7776 | return cp_parser_type_parameter (parser); | |
7777 | /* If it is `class' or `typename' we do not know yet whether it is a | |
7778 | type parameter or a non-type parameter. Consider: | |
7779 | ||
7780 | template <typename T, typename T::X X> ... | |
7781 | ||
7782 | or: | |
7783 | ||
7784 | template <class C, class D*> ... | |
7785 | ||
7786 | Here, the first parameter is a type parameter, and the second is | |
7787 | a non-type parameter. We can tell by looking at the token after | |
7788 | the identifier -- if it is a `,', `=', or `>' then we have a type | |
7789 | parameter. */ | |
7790 | if (token->keyword == RID_TYPENAME || token->keyword == RID_CLASS) | |
7791 | { | |
7792 | /* Peek at the token after `class' or `typename'. */ | |
7793 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
7794 | /* If it's an identifier, skip it. */ | |
7795 | if (token->type == CPP_NAME) | |
7796 | token = cp_lexer_peek_nth_token (parser->lexer, 3); | |
7797 | /* Now, see if the token looks like the end of a template | |
7798 | parameter. */ | |
7799 | if (token->type == CPP_COMMA | |
7800 | || token->type == CPP_EQ | |
7801 | || token->type == CPP_GREATER) | |
7802 | return cp_parser_type_parameter (parser); | |
7803 | } | |
7804 | ||
7805 | /* Otherwise, it is a non-type parameter. | |
7806 | ||
7807 | [temp.param] | |
7808 | ||
7809 | When parsing a default template-argument for a non-type | |
7810 | template-parameter, the first non-nested `>' is taken as the end | |
7811 | of the template parameter-list rather than a greater-than | |
7812 | operator. */ | |
7813 | return | |
7814 | cp_parser_parameter_declaration (parser, | |
7815 | /*greater_than_is_operator_p=*/false); | |
7816 | } | |
7817 | ||
7818 | /* Parse a type-parameter. | |
7819 | ||
7820 | type-parameter: | |
7821 | class identifier [opt] | |
7822 | class identifier [opt] = type-id | |
7823 | typename identifier [opt] | |
7824 | typename identifier [opt] = type-id | |
7825 | template < template-parameter-list > class identifier [opt] | |
7826 | template < template-parameter-list > class identifier [opt] | |
7827 | = id-expression | |
7828 | ||
7829 | Returns a TREE_LIST. The TREE_VALUE is itself a TREE_LIST. The | |
7830 | TREE_PURPOSE is the default-argument, if any. The TREE_VALUE is | |
7831 | the declaration of the parameter. */ | |
7832 | ||
7833 | static tree | |
7834 | cp_parser_type_parameter (parser) | |
7835 | cp_parser *parser; | |
7836 | { | |
7837 | cp_token *token; | |
7838 | tree parameter; | |
7839 | ||
7840 | /* Look for a keyword to tell us what kind of parameter this is. */ | |
7841 | token = cp_parser_require (parser, CPP_KEYWORD, | |
7842 | "expected `class', `typename', or `template'"); | |
7843 | if (!token) | |
7844 | return error_mark_node; | |
7845 | ||
7846 | switch (token->keyword) | |
7847 | { | |
7848 | case RID_CLASS: | |
7849 | case RID_TYPENAME: | |
7850 | { | |
7851 | tree identifier; | |
7852 | tree default_argument; | |
7853 | ||
7854 | /* If the next token is an identifier, then it names the | |
7855 | parameter. */ | |
7856 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME)) | |
7857 | identifier = cp_parser_identifier (parser); | |
7858 | else | |
7859 | identifier = NULL_TREE; | |
7860 | ||
7861 | /* Create the parameter. */ | |
7862 | parameter = finish_template_type_parm (class_type_node, identifier); | |
7863 | ||
7864 | /* If the next token is an `=', we have a default argument. */ | |
7865 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
7866 | { | |
7867 | /* Consume the `=' token. */ | |
7868 | cp_lexer_consume_token (parser->lexer); | |
7869 | /* Parse the default-argumen. */ | |
7870 | default_argument = cp_parser_type_id (parser); | |
7871 | } | |
7872 | else | |
7873 | default_argument = NULL_TREE; | |
7874 | ||
7875 | /* Create the combined representation of the parameter and the | |
7876 | default argument. */ | |
7877 | parameter = build_tree_list (default_argument, | |
7878 | parameter); | |
7879 | } | |
7880 | break; | |
7881 | ||
7882 | case RID_TEMPLATE: | |
7883 | { | |
7884 | tree parameter_list; | |
7885 | tree identifier; | |
7886 | tree default_argument; | |
7887 | ||
7888 | /* Look for the `<'. */ | |
7889 | cp_parser_require (parser, CPP_LESS, "`<'"); | |
7890 | /* Parse the template-parameter-list. */ | |
7891 | begin_template_parm_list (); | |
7892 | parameter_list | |
7893 | = cp_parser_template_parameter_list (parser); | |
7894 | parameter_list = end_template_parm_list (parameter_list); | |
7895 | /* Look for the `>'. */ | |
7896 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
7897 | /* Look for the `class' keyword. */ | |
7898 | cp_parser_require_keyword (parser, RID_CLASS, "`class'"); | |
7899 | /* If the next token is an `=', then there is a | |
7900 | default-argument. If the next token is a `>', we are at | |
7901 | the end of the parameter-list. If the next token is a `,', | |
7902 | then we are at the end of this parameter. */ | |
7903 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_EQ) | |
7904 | && cp_lexer_next_token_is_not (parser->lexer, CPP_GREATER) | |
7905 | && cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
7906 | identifier = cp_parser_identifier (parser); | |
7907 | else | |
7908 | identifier = NULL_TREE; | |
7909 | /* Create the template parameter. */ | |
7910 | parameter = finish_template_template_parm (class_type_node, | |
7911 | identifier); | |
7912 | ||
7913 | /* If the next token is an `=', then there is a | |
7914 | default-argument. */ | |
7915 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
7916 | { | |
7917 | /* Consume the `='. */ | |
7918 | cp_lexer_consume_token (parser->lexer); | |
7919 | /* Parse the id-expression. */ | |
7920 | default_argument | |
7921 | = cp_parser_id_expression (parser, | |
7922 | /*template_keyword_p=*/false, | |
7923 | /*check_dependency_p=*/true, | |
7924 | /*template_p=*/NULL); | |
7925 | /* Look up the name. */ | |
7926 | default_argument | |
7927 | = cp_parser_lookup_name_simple (parser, default_argument); | |
7928 | /* See if the default argument is valid. */ | |
7929 | default_argument | |
7930 | = check_template_template_default_arg (default_argument); | |
7931 | } | |
7932 | else | |
7933 | default_argument = NULL_TREE; | |
7934 | ||
7935 | /* Create the combined representation of the parameter and the | |
7936 | default argument. */ | |
7937 | parameter = build_tree_list (default_argument, | |
7938 | parameter); | |
7939 | } | |
7940 | break; | |
7941 | ||
7942 | default: | |
7943 | /* Anything else is an error. */ | |
7944 | cp_parser_error (parser, | |
7945 | "expected `class', `typename', or `template'"); | |
7946 | parameter = error_mark_node; | |
7947 | } | |
7948 | ||
7949 | return parameter; | |
7950 | } | |
7951 | ||
7952 | /* Parse a template-id. | |
7953 | ||
7954 | template-id: | |
7955 | template-name < template-argument-list [opt] > | |
7956 | ||
7957 | If TEMPLATE_KEYWORD_P is TRUE, then we have just seen the | |
7958 | `template' keyword. In this case, a TEMPLATE_ID_EXPR will be | |
7959 | returned. Otherwise, if the template-name names a function, or set | |
7960 | of functions, returns a TEMPLATE_ID_EXPR. If the template-name | |
7961 | names a class, returns a TYPE_DECL for the specialization. | |
7962 | ||
7963 | If CHECK_DEPENDENCY_P is FALSE, names are looked up in | |
7964 | uninstantiated templates. */ | |
7965 | ||
7966 | static tree | |
7967 | cp_parser_template_id (cp_parser *parser, | |
7968 | bool template_keyword_p, | |
7969 | bool check_dependency_p) | |
7970 | { | |
7971 | tree template; | |
7972 | tree arguments; | |
7973 | tree saved_scope; | |
7974 | tree saved_qualifying_scope; | |
7975 | tree saved_object_scope; | |
7976 | tree template_id; | |
7977 | bool saved_greater_than_is_operator_p; | |
7978 | ptrdiff_t start_of_id; | |
7979 | tree access_check = NULL_TREE; | |
7980 | ||
7981 | /* If the next token corresponds to a template-id, there is no need | |
7982 | to reparse it. */ | |
7983 | if (cp_lexer_next_token_is (parser->lexer, CPP_TEMPLATE_ID)) | |
7984 | { | |
7985 | tree value; | |
7986 | tree check; | |
7987 | ||
7988 | /* Get the stored value. */ | |
7989 | value = cp_lexer_consume_token (parser->lexer)->value; | |
7990 | /* Perform any access checks that were deferred. */ | |
7991 | for (check = TREE_PURPOSE (value); check; check = TREE_CHAIN (check)) | |
7992 | cp_parser_defer_access_check (parser, | |
7993 | TREE_PURPOSE (check), | |
7994 | TREE_VALUE (check)); | |
7995 | /* Return the stored value. */ | |
7996 | return TREE_VALUE (value); | |
7997 | } | |
7998 | ||
7999 | /* Remember where the template-id starts. */ | |
8000 | if (cp_parser_parsing_tentatively (parser) | |
8001 | && !cp_parser_committed_to_tentative_parse (parser)) | |
8002 | { | |
8003 | cp_token *next_token = cp_lexer_peek_token (parser->lexer); | |
8004 | start_of_id = cp_lexer_token_difference (parser->lexer, | |
8005 | parser->lexer->first_token, | |
8006 | next_token); | |
8007 | access_check = parser->context->deferred_access_checks; | |
8008 | } | |
8009 | else | |
8010 | start_of_id = -1; | |
8011 | ||
8012 | /* Parse the template-name. */ | |
8013 | template = cp_parser_template_name (parser, template_keyword_p, | |
8014 | check_dependency_p); | |
8015 | if (template == error_mark_node) | |
8016 | return error_mark_node; | |
8017 | ||
8018 | /* Look for the `<' that starts the template-argument-list. */ | |
8019 | if (!cp_parser_require (parser, CPP_LESS, "`<'")) | |
8020 | return error_mark_node; | |
8021 | ||
8022 | /* [temp.names] | |
8023 | ||
8024 | When parsing a template-id, the first non-nested `>' is taken as | |
8025 | the end of the template-argument-list rather than a greater-than | |
8026 | operator. */ | |
8027 | saved_greater_than_is_operator_p | |
8028 | = parser->greater_than_is_operator_p; | |
8029 | parser->greater_than_is_operator_p = false; | |
8030 | /* Parsing the argument list may modify SCOPE, so we save it | |
8031 | here. */ | |
8032 | saved_scope = parser->scope; | |
8033 | saved_qualifying_scope = parser->qualifying_scope; | |
8034 | saved_object_scope = parser->object_scope; | |
8035 | /* Parse the template-argument-list itself. */ | |
8036 | if (cp_lexer_next_token_is (parser->lexer, CPP_GREATER)) | |
8037 | arguments = NULL_TREE; | |
8038 | else | |
8039 | arguments = cp_parser_template_argument_list (parser); | |
8040 | /* Look for the `>' that ends the template-argument-list. */ | |
8041 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
8042 | /* The `>' token might be a greater-than operator again now. */ | |
8043 | parser->greater_than_is_operator_p | |
8044 | = saved_greater_than_is_operator_p; | |
8045 | /* Restore the SAVED_SCOPE. */ | |
8046 | parser->scope = saved_scope; | |
8047 | parser->qualifying_scope = saved_qualifying_scope; | |
8048 | parser->object_scope = saved_object_scope; | |
8049 | ||
8050 | /* Build a representation of the specialization. */ | |
8051 | if (TREE_CODE (template) == IDENTIFIER_NODE) | |
8052 | template_id = build_min_nt (TEMPLATE_ID_EXPR, template, arguments); | |
8053 | else if (DECL_CLASS_TEMPLATE_P (template) | |
8054 | || DECL_TEMPLATE_TEMPLATE_PARM_P (template)) | |
8055 | template_id | |
8056 | = finish_template_type (template, arguments, | |
8057 | cp_lexer_next_token_is (parser->lexer, | |
8058 | CPP_SCOPE)); | |
8059 | else | |
8060 | { | |
8061 | /* If it's not a class-template or a template-template, it should be | |
8062 | a function-template. */ | |
8063 | my_friendly_assert ((DECL_FUNCTION_TEMPLATE_P (template) | |
8064 | || TREE_CODE (template) == OVERLOAD | |
8065 | || BASELINK_P (template)), | |
8066 | 20010716); | |
8067 | ||
8068 | template_id = lookup_template_function (template, arguments); | |
8069 | } | |
8070 | ||
8071 | /* If parsing tentatively, replace the sequence of tokens that makes | |
8072 | up the template-id with a CPP_TEMPLATE_ID token. That way, | |
8073 | should we re-parse the token stream, we will not have to repeat | |
8074 | the effort required to do the parse, nor will we issue duplicate | |
8075 | error messages about problems during instantiation of the | |
8076 | template. */ | |
8077 | if (start_of_id >= 0) | |
8078 | { | |
8079 | cp_token *token; | |
8080 | tree c; | |
8081 | ||
8082 | /* Find the token that corresponds to the start of the | |
8083 | template-id. */ | |
8084 | token = cp_lexer_advance_token (parser->lexer, | |
8085 | parser->lexer->first_token, | |
8086 | start_of_id); | |
8087 | ||
8088 | /* Remember the access checks associated with this | |
8089 | nested-name-specifier. */ | |
8090 | c = parser->context->deferred_access_checks; | |
8091 | if (c == access_check) | |
8092 | access_check = NULL_TREE; | |
8093 | else | |
8094 | { | |
8095 | while (TREE_CHAIN (c) != access_check) | |
8096 | c = TREE_CHAIN (c); | |
8097 | access_check = parser->context->deferred_access_checks; | |
8098 | parser->context->deferred_access_checks = TREE_CHAIN (c); | |
8099 | TREE_CHAIN (c) = NULL_TREE; | |
8100 | } | |
8101 | ||
8102 | /* Reset the contents of the START_OF_ID token. */ | |
8103 | token->type = CPP_TEMPLATE_ID; | |
8104 | token->value = build_tree_list (access_check, template_id); | |
8105 | token->keyword = RID_MAX; | |
8106 | /* Purge all subsequent tokens. */ | |
8107 | cp_lexer_purge_tokens_after (parser->lexer, token); | |
8108 | } | |
8109 | ||
8110 | return template_id; | |
8111 | } | |
8112 | ||
8113 | /* Parse a template-name. | |
8114 | ||
8115 | template-name: | |
8116 | identifier | |
8117 | ||
8118 | The standard should actually say: | |
8119 | ||
8120 | template-name: | |
8121 | identifier | |
8122 | operator-function-id | |
8123 | conversion-function-id | |
8124 | ||
8125 | A defect report has been filed about this issue. | |
8126 | ||
8127 | If TEMPLATE_KEYWORD_P is true, then we have just seen the | |
8128 | `template' keyword, in a construction like: | |
8129 | ||
8130 | T::template f<3>() | |
8131 | ||
8132 | In that case `f' is taken to be a template-name, even though there | |
8133 | is no way of knowing for sure. | |
8134 | ||
8135 | Returns the TEMPLATE_DECL for the template, or an OVERLOAD if the | |
8136 | name refers to a set of overloaded functions, at least one of which | |
8137 | is a template, or an IDENTIFIER_NODE with the name of the template, | |
8138 | if TEMPLATE_KEYWORD_P is true. If CHECK_DEPENDENCY_P is FALSE, | |
8139 | names are looked up inside uninstantiated templates. */ | |
8140 | ||
8141 | static tree | |
8142 | cp_parser_template_name (parser, template_keyword_p, check_dependency_p) | |
8143 | cp_parser *parser; | |
8144 | bool template_keyword_p; | |
8145 | bool check_dependency_p; | |
8146 | { | |
8147 | tree identifier; | |
8148 | tree decl; | |
8149 | tree fns; | |
8150 | ||
8151 | /* If the next token is `operator', then we have either an | |
8152 | operator-function-id or a conversion-function-id. */ | |
8153 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_OPERATOR)) | |
8154 | { | |
8155 | /* We don't know whether we're looking at an | |
8156 | operator-function-id or a conversion-function-id. */ | |
8157 | cp_parser_parse_tentatively (parser); | |
8158 | /* Try an operator-function-id. */ | |
8159 | identifier = cp_parser_operator_function_id (parser); | |
8160 | /* If that didn't work, try a conversion-function-id. */ | |
8161 | if (!cp_parser_parse_definitely (parser)) | |
8162 | identifier = cp_parser_conversion_function_id (parser); | |
8163 | } | |
8164 | /* Look for the identifier. */ | |
8165 | else | |
8166 | identifier = cp_parser_identifier (parser); | |
8167 | ||
8168 | /* If we didn't find an identifier, we don't have a template-id. */ | |
8169 | if (identifier == error_mark_node) | |
8170 | return error_mark_node; | |
8171 | ||
8172 | /* If the name immediately followed the `template' keyword, then it | |
8173 | is a template-name. However, if the next token is not `<', then | |
8174 | we do not treat it as a template-name, since it is not being used | |
8175 | as part of a template-id. This enables us to handle constructs | |
8176 | like: | |
8177 | ||
8178 | template <typename T> struct S { S(); }; | |
8179 | template <typename T> S<T>::S(); | |
8180 | ||
8181 | correctly. We would treat `S' as a template -- if it were `S<T>' | |
8182 | -- but we do not if there is no `<'. */ | |
8183 | if (template_keyword_p && processing_template_decl | |
8184 | && cp_lexer_next_token_is (parser->lexer, CPP_LESS)) | |
8185 | return identifier; | |
8186 | ||
8187 | /* Look up the name. */ | |
8188 | decl = cp_parser_lookup_name (parser, identifier, | |
8189 | /*check_access=*/true, | |
8190 | /*is_type=*/false, | |
8191 | check_dependency_p); | |
8192 | decl = maybe_get_template_decl_from_type_decl (decl); | |
8193 | ||
8194 | /* If DECL is a template, then the name was a template-name. */ | |
8195 | if (TREE_CODE (decl) == TEMPLATE_DECL) | |
8196 | ; | |
8197 | else | |
8198 | { | |
8199 | /* The standard does not explicitly indicate whether a name that | |
8200 | names a set of overloaded declarations, some of which are | |
8201 | templates, is a template-name. However, such a name should | |
8202 | be a template-name; otherwise, there is no way to form a | |
8203 | template-id for the overloaded templates. */ | |
8204 | fns = BASELINK_P (decl) ? BASELINK_FUNCTIONS (decl) : decl; | |
8205 | if (TREE_CODE (fns) == OVERLOAD) | |
8206 | { | |
8207 | tree fn; | |
8208 | ||
8209 | for (fn = fns; fn; fn = OVL_NEXT (fn)) | |
8210 | if (TREE_CODE (OVL_CURRENT (fn)) == TEMPLATE_DECL) | |
8211 | break; | |
8212 | } | |
8213 | else | |
8214 | { | |
8215 | /* Otherwise, the name does not name a template. */ | |
8216 | cp_parser_error (parser, "expected template-name"); | |
8217 | return error_mark_node; | |
8218 | } | |
8219 | } | |
8220 | ||
8221 | /* If DECL is dependent, and refers to a function, then just return | |
8222 | its name; we will look it up again during template instantiation. */ | |
8223 | if (DECL_FUNCTION_TEMPLATE_P (decl) || !DECL_P (decl)) | |
8224 | { | |
8225 | tree scope = CP_DECL_CONTEXT (get_first_fn (decl)); | |
8226 | if (TYPE_P (scope) && cp_parser_dependent_type_p (scope)) | |
8227 | return identifier; | |
8228 | } | |
8229 | ||
8230 | return decl; | |
8231 | } | |
8232 | ||
8233 | /* Parse a template-argument-list. | |
8234 | ||
8235 | template-argument-list: | |
8236 | template-argument | |
8237 | template-argument-list , template-argument | |
8238 | ||
8239 | Returns a TREE_LIST representing the arguments, in the order they | |
8240 | appeared. The TREE_VALUE of each node is a representation of the | |
8241 | argument. */ | |
8242 | ||
8243 | static tree | |
8244 | cp_parser_template_argument_list (parser) | |
8245 | cp_parser *parser; | |
8246 | { | |
8247 | tree arguments = NULL_TREE; | |
8248 | ||
8249 | while (true) | |
8250 | { | |
8251 | tree argument; | |
8252 | ||
8253 | /* Parse the template-argument. */ | |
8254 | argument = cp_parser_template_argument (parser); | |
8255 | /* Add it to the list. */ | |
8256 | arguments = tree_cons (NULL_TREE, argument, arguments); | |
8257 | /* If it is not a `,', then there are no more arguments. */ | |
8258 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
8259 | break; | |
8260 | /* Otherwise, consume the ','. */ | |
8261 | cp_lexer_consume_token (parser->lexer); | |
8262 | } | |
8263 | ||
8264 | /* We built up the arguments in reverse order. */ | |
8265 | return nreverse (arguments); | |
8266 | } | |
8267 | ||
8268 | /* Parse a template-argument. | |
8269 | ||
8270 | template-argument: | |
8271 | assignment-expression | |
8272 | type-id | |
8273 | id-expression | |
8274 | ||
8275 | The representation is that of an assignment-expression, type-id, or | |
8276 | id-expression -- except that the qualified id-expression is | |
8277 | evaluated, so that the value returned is either a DECL or an | |
8278 | OVERLOAD. */ | |
8279 | ||
8280 | static tree | |
8281 | cp_parser_template_argument (parser) | |
8282 | cp_parser *parser; | |
8283 | { | |
8284 | tree argument; | |
8285 | bool template_p; | |
8286 | ||
8287 | /* There's really no way to know what we're looking at, so we just | |
8288 | try each alternative in order. | |
8289 | ||
8290 | [temp.arg] | |
8291 | ||
8292 | In a template-argument, an ambiguity between a type-id and an | |
8293 | expression is resolved to a type-id, regardless of the form of | |
8294 | the corresponding template-parameter. | |
8295 | ||
8296 | Therefore, we try a type-id first. */ | |
8297 | cp_parser_parse_tentatively (parser); | |
8298 | /* Otherwise, try a type-id. */ | |
8299 | argument = cp_parser_type_id (parser); | |
8300 | /* If the next token isn't a `,' or a `>', then this argument wasn't | |
8301 | really finished. */ | |
8302 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA) | |
8303 | && cp_lexer_next_token_is_not (parser->lexer, CPP_GREATER)) | |
8304 | cp_parser_error (parser, "expected template-argument"); | |
8305 | /* If that worked, we're done. */ | |
8306 | if (cp_parser_parse_definitely (parser)) | |
8307 | return argument; | |
8308 | /* We're still not sure what the argument will be. */ | |
8309 | cp_parser_parse_tentatively (parser); | |
8310 | /* Try a template. */ | |
8311 | argument = cp_parser_id_expression (parser, | |
8312 | /*template_keyword_p=*/false, | |
8313 | /*check_dependency_p=*/true, | |
8314 | &template_p); | |
8315 | /* If the next token isn't a `,' or a `>', then this argument wasn't | |
8316 | really finished. */ | |
8317 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA) | |
8318 | && cp_lexer_next_token_is_not (parser->lexer, CPP_GREATER)) | |
8319 | cp_parser_error (parser, "expected template-argument"); | |
8320 | if (!cp_parser_error_occurred (parser)) | |
8321 | { | |
8322 | /* Figure out what is being referred to. */ | |
8323 | argument = cp_parser_lookup_name_simple (parser, argument); | |
8324 | if (template_p) | |
8325 | argument = make_unbound_class_template (TREE_OPERAND (argument, 0), | |
8326 | TREE_OPERAND (argument, 1), | |
8327 | tf_error | tf_parsing); | |
8328 | else if (TREE_CODE (argument) != TEMPLATE_DECL) | |
8329 | cp_parser_error (parser, "expected template-name"); | |
8330 | } | |
8331 | if (cp_parser_parse_definitely (parser)) | |
8332 | return argument; | |
8333 | /* It must be an assignment-expression. */ | |
8334 | return cp_parser_assignment_expression (parser); | |
8335 | } | |
8336 | ||
8337 | /* Parse an explicit-instantiation. | |
8338 | ||
8339 | explicit-instantiation: | |
8340 | template declaration | |
8341 | ||
8342 | Although the standard says `declaration', what it really means is: | |
8343 | ||
8344 | explicit-instantiation: | |
8345 | template decl-specifier-seq [opt] declarator [opt] ; | |
8346 | ||
8347 | Things like `template int S<int>::i = 5, int S<double>::j;' are not | |
8348 | supposed to be allowed. A defect report has been filed about this | |
8349 | issue. | |
8350 | ||
8351 | GNU Extension: | |
8352 | ||
8353 | explicit-instantiation: | |
8354 | storage-class-specifier template | |
8355 | decl-specifier-seq [opt] declarator [opt] ; | |
8356 | function-specifier template | |
8357 | decl-specifier-seq [opt] declarator [opt] ; */ | |
8358 | ||
8359 | static void | |
8360 | cp_parser_explicit_instantiation (parser) | |
8361 | cp_parser *parser; | |
8362 | { | |
8363 | bool declares_class_or_enum; | |
8364 | tree decl_specifiers; | |
8365 | tree attributes; | |
8366 | tree extension_specifier = NULL_TREE; | |
8367 | ||
8368 | /* Look for an (optional) storage-class-specifier or | |
8369 | function-specifier. */ | |
8370 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
8371 | { | |
8372 | extension_specifier | |
8373 | = cp_parser_storage_class_specifier_opt (parser); | |
8374 | if (!extension_specifier) | |
8375 | extension_specifier = cp_parser_function_specifier_opt (parser); | |
8376 | } | |
8377 | ||
8378 | /* Look for the `template' keyword. */ | |
8379 | cp_parser_require_keyword (parser, RID_TEMPLATE, "`template'"); | |
8380 | /* Let the front end know that we are processing an explicit | |
8381 | instantiation. */ | |
8382 | begin_explicit_instantiation (); | |
8383 | /* [temp.explicit] says that we are supposed to ignore access | |
8384 | control while processing explicit instantiation directives. */ | |
8385 | scope_chain->check_access = 0; | |
8386 | /* Parse a decl-specifier-seq. */ | |
8387 | decl_specifiers | |
8388 | = cp_parser_decl_specifier_seq (parser, | |
8389 | CP_PARSER_FLAGS_OPTIONAL, | |
8390 | &attributes, | |
8391 | &declares_class_or_enum); | |
8392 | /* If there was exactly one decl-specifier, and it declared a class, | |
8393 | and there's no declarator, then we have an explicit type | |
8394 | instantiation. */ | |
8395 | if (declares_class_or_enum && cp_parser_declares_only_class_p (parser)) | |
8396 | { | |
8397 | tree type; | |
8398 | ||
8399 | type = check_tag_decl (decl_specifiers); | |
8400 | if (type) | |
8401 | do_type_instantiation (type, extension_specifier, /*complain=*/1); | |
8402 | } | |
8403 | else | |
8404 | { | |
8405 | tree declarator; | |
8406 | tree decl; | |
8407 | ||
8408 | /* Parse the declarator. */ | |
8409 | declarator | |
8410 | = cp_parser_declarator (parser, | |
8411 | /*abstract_p=*/false, | |
8412 | /*ctor_dtor_or_conv_p=*/NULL); | |
8413 | decl = grokdeclarator (declarator, decl_specifiers, | |
8414 | NORMAL, 0, NULL); | |
8415 | /* Do the explicit instantiation. */ | |
8416 | do_decl_instantiation (decl, extension_specifier); | |
8417 | } | |
8418 | /* We're done with the instantiation. */ | |
8419 | end_explicit_instantiation (); | |
8420 | /* Trun access control back on. */ | |
8421 | scope_chain->check_access = flag_access_control; | |
8422 | ||
8423 | /* Look for the trailing `;'. */ | |
8424 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
8425 | } | |
8426 | ||
8427 | /* Parse an explicit-specialization. | |
8428 | ||
8429 | explicit-specialization: | |
8430 | template < > declaration | |
8431 | ||
8432 | Although the standard says `declaration', what it really means is: | |
8433 | ||
8434 | explicit-specialization: | |
8435 | template <> decl-specifier [opt] init-declarator [opt] ; | |
8436 | template <> function-definition | |
8437 | template <> explicit-specialization | |
8438 | template <> template-declaration */ | |
8439 | ||
8440 | static void | |
8441 | cp_parser_explicit_specialization (parser) | |
8442 | cp_parser *parser; | |
8443 | { | |
8444 | /* Look for the `template' keyword. */ | |
8445 | cp_parser_require_keyword (parser, RID_TEMPLATE, "`template'"); | |
8446 | /* Look for the `<'. */ | |
8447 | cp_parser_require (parser, CPP_LESS, "`<'"); | |
8448 | /* Look for the `>'. */ | |
8449 | cp_parser_require (parser, CPP_GREATER, "`>'"); | |
8450 | /* We have processed another parameter list. */ | |
8451 | ++parser->num_template_parameter_lists; | |
8452 | /* Let the front end know that we are beginning a specialization. */ | |
8453 | begin_specialization (); | |
8454 | ||
8455 | /* If the next keyword is `template', we need to figure out whether | |
8456 | or not we're looking a template-declaration. */ | |
8457 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
8458 | { | |
8459 | if (cp_lexer_peek_nth_token (parser->lexer, 2)->type == CPP_LESS | |
8460 | && cp_lexer_peek_nth_token (parser->lexer, 3)->type != CPP_GREATER) | |
8461 | cp_parser_template_declaration_after_export (parser, | |
8462 | /*member_p=*/false); | |
8463 | else | |
8464 | cp_parser_explicit_specialization (parser); | |
8465 | } | |
8466 | else | |
8467 | /* Parse the dependent declaration. */ | |
8468 | cp_parser_single_declaration (parser, | |
8469 | /*member_p=*/false, | |
8470 | /*friend_p=*/NULL); | |
8471 | ||
8472 | /* We're done with the specialization. */ | |
8473 | end_specialization (); | |
8474 | /* We're done with this parameter list. */ | |
8475 | --parser->num_template_parameter_lists; | |
8476 | } | |
8477 | ||
8478 | /* Parse a type-specifier. | |
8479 | ||
8480 | type-specifier: | |
8481 | simple-type-specifier | |
8482 | class-specifier | |
8483 | enum-specifier | |
8484 | elaborated-type-specifier | |
8485 | cv-qualifier | |
8486 | ||
8487 | GNU Extension: | |
8488 | ||
8489 | type-specifier: | |
8490 | __complex__ | |
8491 | ||
8492 | Returns a representation of the type-specifier. If the | |
8493 | type-specifier is a keyword (like `int' or `const', or | |
8494 | `__complex__') then the correspoding IDENTIFIER_NODE is returned. | |
8495 | For a class-specifier, enum-specifier, or elaborated-type-specifier | |
8496 | a TREE_TYPE is returned; otherwise, a TYPE_DECL is returned. | |
8497 | ||
8498 | If IS_FRIEND is TRUE then this type-specifier is being declared a | |
8499 | `friend'. If IS_DECLARATION is TRUE, then this type-specifier is | |
8500 | appearing in a decl-specifier-seq. | |
8501 | ||
8502 | If DECLARES_CLASS_OR_ENUM is non-NULL, and the type-specifier is a | |
8503 | class-specifier, enum-specifier, or elaborated-type-specifier, then | |
8504 | *DECLARES_CLASS_OR_ENUM is set to TRUE. Otherwise, it is set to | |
8505 | FALSE. | |
8506 | ||
8507 | If IS_CV_QUALIFIER is non-NULL, and the type-specifier is a | |
8508 | cv-qualifier, then IS_CV_QUALIFIER is set to TRUE. Otherwise, it | |
8509 | is set to FALSE. */ | |
8510 | ||
8511 | static tree | |
8512 | cp_parser_type_specifier (parser, | |
8513 | flags, | |
8514 | is_friend, | |
8515 | is_declaration, | |
8516 | declares_class_or_enum, | |
8517 | is_cv_qualifier) | |
8518 | cp_parser *parser; | |
8519 | cp_parser_flags flags; | |
8520 | bool is_friend; | |
8521 | bool is_declaration; | |
8522 | bool *declares_class_or_enum; | |
8523 | bool *is_cv_qualifier; | |
8524 | { | |
8525 | tree type_spec = NULL_TREE; | |
8526 | cp_token *token; | |
8527 | enum rid keyword; | |
8528 | ||
8529 | /* Assume this type-specifier does not declare a new type. */ | |
8530 | if (declares_class_or_enum) | |
8531 | *declares_class_or_enum = false; | |
8532 | /* And that it does not specify a cv-qualifier. */ | |
8533 | if (is_cv_qualifier) | |
8534 | *is_cv_qualifier = false; | |
8535 | /* Peek at the next token. */ | |
8536 | token = cp_lexer_peek_token (parser->lexer); | |
8537 | ||
8538 | /* If we're looking at a keyword, we can use that to guide the | |
8539 | production we choose. */ | |
8540 | keyword = token->keyword; | |
8541 | switch (keyword) | |
8542 | { | |
8543 | /* Any of these indicate either a class-specifier, or an | |
8544 | elaborated-type-specifier. */ | |
8545 | case RID_CLASS: | |
8546 | case RID_STRUCT: | |
8547 | case RID_UNION: | |
8548 | case RID_ENUM: | |
8549 | /* Parse tentatively so that we can back up if we don't find a | |
8550 | class-specifier or enum-specifier. */ | |
8551 | cp_parser_parse_tentatively (parser); | |
8552 | /* Look for the class-specifier or enum-specifier. */ | |
8553 | if (keyword == RID_ENUM) | |
8554 | type_spec = cp_parser_enum_specifier (parser); | |
8555 | else | |
8556 | type_spec = cp_parser_class_specifier (parser); | |
8557 | ||
8558 | /* If that worked, we're done. */ | |
8559 | if (cp_parser_parse_definitely (parser)) | |
8560 | { | |
8561 | if (declares_class_or_enum) | |
8562 | *declares_class_or_enum = true; | |
8563 | return type_spec; | |
8564 | } | |
8565 | ||
8566 | /* Fall through. */ | |
8567 | ||
8568 | case RID_TYPENAME: | |
8569 | /* Look for an elaborated-type-specifier. */ | |
8570 | type_spec = cp_parser_elaborated_type_specifier (parser, | |
8571 | is_friend, | |
8572 | is_declaration); | |
8573 | /* We're declaring a class or enum -- unless we're using | |
8574 | `typename'. */ | |
8575 | if (declares_class_or_enum && keyword != RID_TYPENAME) | |
8576 | *declares_class_or_enum = true; | |
8577 | return type_spec; | |
8578 | ||
8579 | case RID_CONST: | |
8580 | case RID_VOLATILE: | |
8581 | case RID_RESTRICT: | |
8582 | type_spec = cp_parser_cv_qualifier_opt (parser); | |
8583 | /* Even though we call a routine that looks for an optional | |
8584 | qualifier, we know that there should be one. */ | |
8585 | my_friendly_assert (type_spec != NULL, 20000328); | |
8586 | /* This type-specifier was a cv-qualified. */ | |
8587 | if (is_cv_qualifier) | |
8588 | *is_cv_qualifier = true; | |
8589 | ||
8590 | return type_spec; | |
8591 | ||
8592 | case RID_COMPLEX: | |
8593 | /* The `__complex__' keyword is a GNU extension. */ | |
8594 | return cp_lexer_consume_token (parser->lexer)->value; | |
8595 | ||
8596 | default: | |
8597 | break; | |
8598 | } | |
8599 | ||
8600 | /* If we do not already have a type-specifier, assume we are looking | |
8601 | at a simple-type-specifier. */ | |
8602 | type_spec = cp_parser_simple_type_specifier (parser, flags); | |
8603 | ||
8604 | /* If we didn't find a type-specifier, and a type-specifier was not | |
8605 | optional in this context, issue an error message. */ | |
8606 | if (!type_spec && !(flags & CP_PARSER_FLAGS_OPTIONAL)) | |
8607 | { | |
8608 | cp_parser_error (parser, "expected type specifier"); | |
8609 | return error_mark_node; | |
8610 | } | |
8611 | ||
8612 | return type_spec; | |
8613 | } | |
8614 | ||
8615 | /* Parse a simple-type-specifier. | |
8616 | ||
8617 | simple-type-specifier: | |
8618 | :: [opt] nested-name-specifier [opt] type-name | |
8619 | :: [opt] nested-name-specifier template template-id | |
8620 | char | |
8621 | wchar_t | |
8622 | bool | |
8623 | short | |
8624 | int | |
8625 | long | |
8626 | signed | |
8627 | unsigned | |
8628 | float | |
8629 | double | |
8630 | void | |
8631 | ||
8632 | GNU Extension: | |
8633 | ||
8634 | simple-type-specifier: | |
8635 | __typeof__ unary-expression | |
8636 | __typeof__ ( type-id ) | |
8637 | ||
8638 | For the various keywords, the value returned is simply the | |
8639 | TREE_IDENTIFIER representing the keyword. For the first two | |
8640 | productions, the value returned is the indicated TYPE_DECL. */ | |
8641 | ||
8642 | static tree | |
8643 | cp_parser_simple_type_specifier (parser, flags) | |
8644 | cp_parser *parser; | |
8645 | cp_parser_flags flags; | |
8646 | { | |
8647 | tree type = NULL_TREE; | |
8648 | cp_token *token; | |
8649 | ||
8650 | /* Peek at the next token. */ | |
8651 | token = cp_lexer_peek_token (parser->lexer); | |
8652 | ||
8653 | /* If we're looking at a keyword, things are easy. */ | |
8654 | switch (token->keyword) | |
8655 | { | |
8656 | case RID_CHAR: | |
8657 | case RID_WCHAR: | |
8658 | case RID_BOOL: | |
8659 | case RID_SHORT: | |
8660 | case RID_INT: | |
8661 | case RID_LONG: | |
8662 | case RID_SIGNED: | |
8663 | case RID_UNSIGNED: | |
8664 | case RID_FLOAT: | |
8665 | case RID_DOUBLE: | |
8666 | case RID_VOID: | |
8667 | /* Consume the token. */ | |
8668 | return cp_lexer_consume_token (parser->lexer)->value; | |
8669 | ||
8670 | case RID_TYPEOF: | |
8671 | { | |
8672 | tree operand; | |
8673 | ||
8674 | /* Consume the `typeof' token. */ | |
8675 | cp_lexer_consume_token (parser->lexer); | |
8676 | /* Parse the operand to `typeof' */ | |
8677 | operand = cp_parser_sizeof_operand (parser, RID_TYPEOF); | |
8678 | /* If it is not already a TYPE, take its type. */ | |
8679 | if (!TYPE_P (operand)) | |
8680 | operand = finish_typeof (operand); | |
8681 | ||
8682 | return operand; | |
8683 | } | |
8684 | ||
8685 | default: | |
8686 | break; | |
8687 | } | |
8688 | ||
8689 | /* The type-specifier must be a user-defined type. */ | |
8690 | if (!(flags & CP_PARSER_FLAGS_NO_USER_DEFINED_TYPES)) | |
8691 | { | |
8692 | /* Don't gobble tokens or issue error messages if this is an | |
8693 | optional type-specifier. */ | |
8694 | if (flags & CP_PARSER_FLAGS_OPTIONAL) | |
8695 | cp_parser_parse_tentatively (parser); | |
8696 | ||
8697 | /* Look for the optional `::' operator. */ | |
8698 | cp_parser_global_scope_opt (parser, | |
8699 | /*current_scope_valid_p=*/false); | |
8700 | /* Look for the nested-name specifier. */ | |
8701 | cp_parser_nested_name_specifier_opt (parser, | |
8702 | /*typename_keyword_p=*/false, | |
8703 | /*check_dependency_p=*/true, | |
8704 | /*type_p=*/false); | |
8705 | /* If we have seen a nested-name-specifier, and the next token | |
8706 | is `template', then we are using the template-id production. */ | |
8707 | if (parser->scope | |
8708 | && cp_parser_optional_template_keyword (parser)) | |
8709 | { | |
8710 | /* Look for the template-id. */ | |
8711 | type = cp_parser_template_id (parser, | |
8712 | /*template_keyword_p=*/true, | |
8713 | /*check_dependency_p=*/true); | |
8714 | /* If the template-id did not name a type, we are out of | |
8715 | luck. */ | |
8716 | if (TREE_CODE (type) != TYPE_DECL) | |
8717 | { | |
8718 | cp_parser_error (parser, "expected template-id for type"); | |
8719 | type = NULL_TREE; | |
8720 | } | |
8721 | } | |
8722 | /* Otherwise, look for a type-name. */ | |
8723 | else | |
8724 | { | |
8725 | type = cp_parser_type_name (parser); | |
8726 | if (type == error_mark_node) | |
8727 | type = NULL_TREE; | |
8728 | } | |
8729 | ||
8730 | /* If it didn't work out, we don't have a TYPE. */ | |
8731 | if ((flags & CP_PARSER_FLAGS_OPTIONAL) | |
8732 | && !cp_parser_parse_definitely (parser)) | |
8733 | type = NULL_TREE; | |
8734 | } | |
8735 | ||
8736 | /* If we didn't get a type-name, issue an error message. */ | |
8737 | if (!type && !(flags & CP_PARSER_FLAGS_OPTIONAL)) | |
8738 | { | |
8739 | cp_parser_error (parser, "expected type-name"); | |
8740 | return error_mark_node; | |
8741 | } | |
8742 | ||
8743 | return type; | |
8744 | } | |
8745 | ||
8746 | /* Parse a type-name. | |
8747 | ||
8748 | type-name: | |
8749 | class-name | |
8750 | enum-name | |
8751 | typedef-name | |
8752 | ||
8753 | enum-name: | |
8754 | identifier | |
8755 | ||
8756 | typedef-name: | |
8757 | identifier | |
8758 | ||
8759 | Returns a TYPE_DECL for the the type. */ | |
8760 | ||
8761 | static tree | |
8762 | cp_parser_type_name (parser) | |
8763 | cp_parser *parser; | |
8764 | { | |
8765 | tree type_decl; | |
8766 | tree identifier; | |
8767 | ||
8768 | /* We can't know yet whether it is a class-name or not. */ | |
8769 | cp_parser_parse_tentatively (parser); | |
8770 | /* Try a class-name. */ | |
8771 | type_decl = cp_parser_class_name (parser, | |
8772 | /*typename_keyword_p=*/false, | |
8773 | /*template_keyword_p=*/false, | |
8774 | /*type_p=*/false, | |
8775 | /*check_access_p=*/true, | |
8776 | /*check_dependency_p=*/true, | |
8777 | /*class_head_p=*/false); | |
8778 | /* If it's not a class-name, keep looking. */ | |
8779 | if (!cp_parser_parse_definitely (parser)) | |
8780 | { | |
8781 | /* It must be a typedef-name or an enum-name. */ | |
8782 | identifier = cp_parser_identifier (parser); | |
8783 | if (identifier == error_mark_node) | |
8784 | return error_mark_node; | |
8785 | ||
8786 | /* Look up the type-name. */ | |
8787 | type_decl = cp_parser_lookup_name_simple (parser, identifier); | |
8788 | /* Issue an error if we did not find a type-name. */ | |
8789 | if (TREE_CODE (type_decl) != TYPE_DECL) | |
8790 | { | |
8791 | cp_parser_error (parser, "expected type-name"); | |
8792 | type_decl = error_mark_node; | |
8793 | } | |
8794 | /* Remember that the name was used in the definition of the | |
8795 | current class so that we can check later to see if the | |
8796 | meaning would have been different after the class was | |
8797 | entirely defined. */ | |
8798 | else if (type_decl != error_mark_node | |
8799 | && !parser->scope) | |
8800 | maybe_note_name_used_in_class (identifier, type_decl); | |
8801 | } | |
8802 | ||
8803 | return type_decl; | |
8804 | } | |
8805 | ||
8806 | ||
8807 | /* Parse an elaborated-type-specifier. Note that the grammar given | |
8808 | here incorporates the resolution to DR68. | |
8809 | ||
8810 | elaborated-type-specifier: | |
8811 | class-key :: [opt] nested-name-specifier [opt] identifier | |
8812 | class-key :: [opt] nested-name-specifier [opt] template [opt] template-id | |
8813 | enum :: [opt] nested-name-specifier [opt] identifier | |
8814 | typename :: [opt] nested-name-specifier identifier | |
8815 | typename :: [opt] nested-name-specifier template [opt] | |
8816 | template-id | |
8817 | ||
8818 | If IS_FRIEND is TRUE, then this elaborated-type-specifier is being | |
8819 | declared `friend'. If IS_DECLARATION is TRUE, then this | |
8820 | elaborated-type-specifier appears in a decl-specifiers-seq, i.e., | |
8821 | something is being declared. | |
8822 | ||
8823 | Returns the TYPE specified. */ | |
8824 | ||
8825 | static tree | |
8826 | cp_parser_elaborated_type_specifier (parser, is_friend, is_declaration) | |
8827 | cp_parser *parser; | |
8828 | bool is_friend; | |
8829 | bool is_declaration; | |
8830 | { | |
8831 | enum tag_types tag_type; | |
8832 | tree identifier; | |
8833 | tree type = NULL_TREE; | |
8834 | ||
8835 | /* See if we're looking at the `enum' keyword. */ | |
8836 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_ENUM)) | |
8837 | { | |
8838 | /* Consume the `enum' token. */ | |
8839 | cp_lexer_consume_token (parser->lexer); | |
8840 | /* Remember that it's an enumeration type. */ | |
8841 | tag_type = enum_type; | |
8842 | } | |
8843 | /* Or, it might be `typename'. */ | |
8844 | else if (cp_lexer_next_token_is_keyword (parser->lexer, | |
8845 | RID_TYPENAME)) | |
8846 | { | |
8847 | /* Consume the `typename' token. */ | |
8848 | cp_lexer_consume_token (parser->lexer); | |
8849 | /* Remember that it's a `typename' type. */ | |
8850 | tag_type = typename_type; | |
8851 | /* The `typename' keyword is only allowed in templates. */ | |
8852 | if (!processing_template_decl) | |
8853 | pedwarn ("using `typename' outside of template"); | |
8854 | } | |
8855 | /* Otherwise it must be a class-key. */ | |
8856 | else | |
8857 | { | |
8858 | tag_type = cp_parser_class_key (parser); | |
8859 | if (tag_type == none_type) | |
8860 | return error_mark_node; | |
8861 | } | |
8862 | ||
8863 | /* Look for the `::' operator. */ | |
8864 | cp_parser_global_scope_opt (parser, | |
8865 | /*current_scope_valid_p=*/false); | |
8866 | /* Look for the nested-name-specifier. */ | |
8867 | if (tag_type == typename_type) | |
8868 | cp_parser_nested_name_specifier (parser, | |
8869 | /*typename_keyword_p=*/true, | |
8870 | /*check_dependency_p=*/true, | |
8871 | /*type_p=*/true); | |
8872 | else | |
8873 | /* Even though `typename' is not present, the proposed resolution | |
8874 | to Core Issue 180 says that in `class A<T>::B', `B' should be | |
8875 | considered a type-name, even if `A<T>' is dependent. */ | |
8876 | cp_parser_nested_name_specifier_opt (parser, | |
8877 | /*typename_keyword_p=*/true, | |
8878 | /*check_dependency_p=*/true, | |
8879 | /*type_p=*/true); | |
8880 | /* For everything but enumeration types, consider a template-id. */ | |
8881 | if (tag_type != enum_type) | |
8882 | { | |
8883 | bool template_p = false; | |
8884 | tree decl; | |
8885 | ||
8886 | /* Allow the `template' keyword. */ | |
8887 | template_p = cp_parser_optional_template_keyword (parser); | |
8888 | /* If we didn't see `template', we don't know if there's a | |
8889 | template-id or not. */ | |
8890 | if (!template_p) | |
8891 | cp_parser_parse_tentatively (parser); | |
8892 | /* Parse the template-id. */ | |
8893 | decl = cp_parser_template_id (parser, template_p, | |
8894 | /*check_dependency_p=*/true); | |
8895 | /* If we didn't find a template-id, look for an ordinary | |
8896 | identifier. */ | |
8897 | if (!template_p && !cp_parser_parse_definitely (parser)) | |
8898 | ; | |
8899 | /* If DECL is a TEMPLATE_ID_EXPR, and the `typename' keyword is | |
8900 | in effect, then we must assume that, upon instantiation, the | |
8901 | template will correspond to a class. */ | |
8902 | else if (TREE_CODE (decl) == TEMPLATE_ID_EXPR | |
8903 | && tag_type == typename_type) | |
8904 | type = make_typename_type (parser->scope, decl, | |
8905 | /*complain=*/1); | |
8906 | else | |
8907 | type = TREE_TYPE (decl); | |
8908 | } | |
8909 | ||
8910 | /* For an enumeration type, consider only a plain identifier. */ | |
8911 | if (!type) | |
8912 | { | |
8913 | identifier = cp_parser_identifier (parser); | |
8914 | ||
8915 | if (identifier == error_mark_node) | |
8916 | return error_mark_node; | |
8917 | ||
8918 | /* For a `typename', we needn't call xref_tag. */ | |
8919 | if (tag_type == typename_type) | |
8920 | return make_typename_type (parser->scope, identifier, | |
8921 | /*complain=*/1); | |
8922 | /* Look up a qualified name in the usual way. */ | |
8923 | if (parser->scope) | |
8924 | { | |
8925 | tree decl; | |
8926 | ||
8927 | /* In an elaborated-type-specifier, names are assumed to name | |
8928 | types, so we set IS_TYPE to TRUE when calling | |
8929 | cp_parser_lookup_name. */ | |
8930 | decl = cp_parser_lookup_name (parser, identifier, | |
8931 | /*check_access=*/true, | |
8932 | /*is_type=*/true, | |
8933 | /*check_dependency=*/true); | |
8934 | decl = (cp_parser_maybe_treat_template_as_class | |
8935 | (decl, /*tag_name_p=*/is_friend)); | |
8936 | ||
8937 | if (TREE_CODE (decl) != TYPE_DECL) | |
8938 | { | |
8939 | error ("expected type-name"); | |
8940 | return error_mark_node; | |
8941 | } | |
8942 | else if (TREE_CODE (TREE_TYPE (decl)) == ENUMERAL_TYPE | |
8943 | && tag_type != enum_type) | |
8944 | error ("`%T' referred to as `%s'", TREE_TYPE (decl), | |
8945 | tag_type == record_type ? "struct" : "class"); | |
8946 | else if (TREE_CODE (TREE_TYPE (decl)) != ENUMERAL_TYPE | |
8947 | && tag_type == enum_type) | |
8948 | error ("`%T' referred to as enum", TREE_TYPE (decl)); | |
8949 | ||
8950 | type = TREE_TYPE (decl); | |
8951 | } | |
8952 | else | |
8953 | { | |
8954 | /* An elaborated-type-specifier sometimes introduces a new type and | |
8955 | sometimes names an existing type. Normally, the rule is that it | |
8956 | introduces a new type only if there is not an existing type of | |
8957 | the same name already in scope. For example, given: | |
8958 | ||
8959 | struct S {}; | |
8960 | void f() { struct S s; } | |
8961 | ||
8962 | the `struct S' in the body of `f' is the same `struct S' as in | |
8963 | the global scope; the existing definition is used. However, if | |
8964 | there were no global declaration, this would introduce a new | |
8965 | local class named `S'. | |
8966 | ||
8967 | An exception to this rule applies to the following code: | |
8968 | ||
8969 | namespace N { struct S; } | |
8970 | ||
8971 | Here, the elaborated-type-specifier names a new type | |
8972 | unconditionally; even if there is already an `S' in the | |
8973 | containing scope this declaration names a new type. | |
8974 | This exception only applies if the elaborated-type-specifier | |
8975 | forms the complete declaration: | |
8976 | ||
8977 | [class.name] | |
8978 | ||
8979 | A declaration consisting solely of `class-key identifier ;' is | |
8980 | either a redeclaration of the name in the current scope or a | |
8981 | forward declaration of the identifier as a class name. It | |
8982 | introduces the name into the current scope. | |
8983 | ||
8984 | We are in this situation precisely when the next token is a `;'. | |
8985 | ||
8986 | An exception to the exception is that a `friend' declaration does | |
8987 | *not* name a new type; i.e., given: | |
8988 | ||
8989 | struct S { friend struct T; }; | |
8990 | ||
8991 | `T' is not a new type in the scope of `S'. | |
8992 | ||
8993 | Also, `new struct S' or `sizeof (struct S)' never results in the | |
8994 | definition of a new type; a new type can only be declared in a | |
8995 | declaration context. */ | |
8996 | ||
8997 | type = xref_tag (tag_type, identifier, | |
8998 | /*attributes=*/NULL_TREE, | |
8999 | (is_friend | |
9000 | || !is_declaration | |
9001 | || cp_lexer_next_token_is_not (parser->lexer, | |
9002 | CPP_SEMICOLON))); | |
9003 | } | |
9004 | } | |
9005 | if (tag_type != enum_type) | |
9006 | cp_parser_check_class_key (tag_type, type); | |
9007 | return type; | |
9008 | } | |
9009 | ||
9010 | /* Parse an enum-specifier. | |
9011 | ||
9012 | enum-specifier: | |
9013 | enum identifier [opt] { enumerator-list [opt] } | |
9014 | ||
9015 | Returns an ENUM_TYPE representing the enumeration. */ | |
9016 | ||
9017 | static tree | |
9018 | cp_parser_enum_specifier (parser) | |
9019 | cp_parser *parser; | |
9020 | { | |
9021 | cp_token *token; | |
9022 | tree identifier = NULL_TREE; | |
9023 | tree type; | |
9024 | ||
9025 | /* Look for the `enum' keyword. */ | |
9026 | if (!cp_parser_require_keyword (parser, RID_ENUM, "`enum'")) | |
9027 | return error_mark_node; | |
9028 | /* Peek at the next token. */ | |
9029 | token = cp_lexer_peek_token (parser->lexer); | |
9030 | ||
9031 | /* See if it is an identifier. */ | |
9032 | if (token->type == CPP_NAME) | |
9033 | identifier = cp_parser_identifier (parser); | |
9034 | ||
9035 | /* Look for the `{'. */ | |
9036 | if (!cp_parser_require (parser, CPP_OPEN_BRACE, "`{'")) | |
9037 | return error_mark_node; | |
9038 | ||
9039 | /* At this point, we're going ahead with the enum-specifier, even | |
9040 | if some other problem occurs. */ | |
9041 | cp_parser_commit_to_tentative_parse (parser); | |
9042 | ||
9043 | /* Issue an error message if type-definitions are forbidden here. */ | |
9044 | cp_parser_check_type_definition (parser); | |
9045 | ||
9046 | /* Create the new type. */ | |
9047 | type = start_enum (identifier ? identifier : make_anon_name ()); | |
9048 | ||
9049 | /* Peek at the next token. */ | |
9050 | token = cp_lexer_peek_token (parser->lexer); | |
9051 | /* If it's not a `}', then there are some enumerators. */ | |
9052 | if (token->type != CPP_CLOSE_BRACE) | |
9053 | cp_parser_enumerator_list (parser, type); | |
9054 | /* Look for the `}'. */ | |
9055 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
9056 | ||
9057 | /* Finish up the enumeration. */ | |
9058 | finish_enum (type); | |
9059 | ||
9060 | return type; | |
9061 | } | |
9062 | ||
9063 | /* Parse an enumerator-list. The enumerators all have the indicated | |
9064 | TYPE. | |
9065 | ||
9066 | enumerator-list: | |
9067 | enumerator-definition | |
9068 | enumerator-list , enumerator-definition */ | |
9069 | ||
9070 | static void | |
9071 | cp_parser_enumerator_list (parser, type) | |
9072 | cp_parser *parser; | |
9073 | tree type; | |
9074 | { | |
9075 | while (true) | |
9076 | { | |
9077 | cp_token *token; | |
9078 | ||
9079 | /* Parse an enumerator-definition. */ | |
9080 | cp_parser_enumerator_definition (parser, type); | |
9081 | /* Peek at the next token. */ | |
9082 | token = cp_lexer_peek_token (parser->lexer); | |
9083 | /* If it's not a `,', then we've reached the end of the | |
9084 | list. */ | |
9085 | if (token->type != CPP_COMMA) | |
9086 | break; | |
9087 | /* Otherwise, consume the `,' and keep going. */ | |
9088 | cp_lexer_consume_token (parser->lexer); | |
9089 | /* If the next token is a `}', there is a trailing comma. */ | |
9090 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_BRACE)) | |
9091 | { | |
9092 | if (pedantic && !in_system_header) | |
9093 | pedwarn ("comma at end of enumerator list"); | |
9094 | break; | |
9095 | } | |
9096 | } | |
9097 | } | |
9098 | ||
9099 | /* Parse an enumerator-definition. The enumerator has the indicated | |
9100 | TYPE. | |
9101 | ||
9102 | enumerator-definition: | |
9103 | enumerator | |
9104 | enumerator = constant-expression | |
9105 | ||
9106 | enumerator: | |
9107 | identifier */ | |
9108 | ||
9109 | static void | |
9110 | cp_parser_enumerator_definition (parser, type) | |
9111 | cp_parser *parser; | |
9112 | tree type; | |
9113 | { | |
9114 | cp_token *token; | |
9115 | tree identifier; | |
9116 | tree value; | |
9117 | ||
9118 | /* Look for the identifier. */ | |
9119 | identifier = cp_parser_identifier (parser); | |
9120 | if (identifier == error_mark_node) | |
9121 | return; | |
9122 | ||
9123 | /* Peek at the next token. */ | |
9124 | token = cp_lexer_peek_token (parser->lexer); | |
9125 | /* If it's an `=', then there's an explicit value. */ | |
9126 | if (token->type == CPP_EQ) | |
9127 | { | |
9128 | /* Consume the `=' token. */ | |
9129 | cp_lexer_consume_token (parser->lexer); | |
9130 | /* Parse the value. */ | |
9131 | value = cp_parser_constant_expression (parser); | |
9132 | } | |
9133 | else | |
9134 | value = NULL_TREE; | |
9135 | ||
9136 | /* Create the enumerator. */ | |
9137 | build_enumerator (identifier, value, type); | |
9138 | } | |
9139 | ||
9140 | /* Parse a namespace-name. | |
9141 | ||
9142 | namespace-name: | |
9143 | original-namespace-name | |
9144 | namespace-alias | |
9145 | ||
9146 | Returns the NAMESPACE_DECL for the namespace. */ | |
9147 | ||
9148 | static tree | |
9149 | cp_parser_namespace_name (parser) | |
9150 | cp_parser *parser; | |
9151 | { | |
9152 | tree identifier; | |
9153 | tree namespace_decl; | |
9154 | ||
9155 | /* Get the name of the namespace. */ | |
9156 | identifier = cp_parser_identifier (parser); | |
9157 | if (identifier == error_mark_node) | |
9158 | return error_mark_node; | |
9159 | ||
9160 | /* Look up the identifier in the currently active scope. */ | |
9161 | namespace_decl = cp_parser_lookup_name_simple (parser, identifier); | |
9162 | /* If it's not a namespace, issue an error. */ | |
9163 | if (namespace_decl == error_mark_node | |
9164 | || TREE_CODE (namespace_decl) != NAMESPACE_DECL) | |
9165 | { | |
9166 | cp_parser_error (parser, "expected namespace-name"); | |
9167 | namespace_decl = error_mark_node; | |
9168 | } | |
9169 | ||
9170 | return namespace_decl; | |
9171 | } | |
9172 | ||
9173 | /* Parse a namespace-definition. | |
9174 | ||
9175 | namespace-definition: | |
9176 | named-namespace-definition | |
9177 | unnamed-namespace-definition | |
9178 | ||
9179 | named-namespace-definition: | |
9180 | original-namespace-definition | |
9181 | extension-namespace-definition | |
9182 | ||
9183 | original-namespace-definition: | |
9184 | namespace identifier { namespace-body } | |
9185 | ||
9186 | extension-namespace-definition: | |
9187 | namespace original-namespace-name { namespace-body } | |
9188 | ||
9189 | unnamed-namespace-definition: | |
9190 | namespace { namespace-body } */ | |
9191 | ||
9192 | static void | |
9193 | cp_parser_namespace_definition (parser) | |
9194 | cp_parser *parser; | |
9195 | { | |
9196 | tree identifier; | |
9197 | ||
9198 | /* Look for the `namespace' keyword. */ | |
9199 | cp_parser_require_keyword (parser, RID_NAMESPACE, "`namespace'"); | |
9200 | ||
9201 | /* Get the name of the namespace. We do not attempt to distinguish | |
9202 | between an original-namespace-definition and an | |
9203 | extension-namespace-definition at this point. The semantic | |
9204 | analysis routines are responsible for that. */ | |
9205 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME)) | |
9206 | identifier = cp_parser_identifier (parser); | |
9207 | else | |
9208 | identifier = NULL_TREE; | |
9209 | ||
9210 | /* Look for the `{' to start the namespace. */ | |
9211 | cp_parser_require (parser, CPP_OPEN_BRACE, "`{'"); | |
9212 | /* Start the namespace. */ | |
9213 | push_namespace (identifier); | |
9214 | /* Parse the body of the namespace. */ | |
9215 | cp_parser_namespace_body (parser); | |
9216 | /* Finish the namespace. */ | |
9217 | pop_namespace (); | |
9218 | /* Look for the final `}'. */ | |
9219 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
9220 | } | |
9221 | ||
9222 | /* Parse a namespace-body. | |
9223 | ||
9224 | namespace-body: | |
9225 | declaration-seq [opt] */ | |
9226 | ||
9227 | static void | |
9228 | cp_parser_namespace_body (parser) | |
9229 | cp_parser *parser; | |
9230 | { | |
9231 | cp_parser_declaration_seq_opt (parser); | |
9232 | } | |
9233 | ||
9234 | /* Parse a namespace-alias-definition. | |
9235 | ||
9236 | namespace-alias-definition: | |
9237 | namespace identifier = qualified-namespace-specifier ; */ | |
9238 | ||
9239 | static void | |
9240 | cp_parser_namespace_alias_definition (parser) | |
9241 | cp_parser *parser; | |
9242 | { | |
9243 | tree identifier; | |
9244 | tree namespace_specifier; | |
9245 | ||
9246 | /* Look for the `namespace' keyword. */ | |
9247 | cp_parser_require_keyword (parser, RID_NAMESPACE, "`namespace'"); | |
9248 | /* Look for the identifier. */ | |
9249 | identifier = cp_parser_identifier (parser); | |
9250 | if (identifier == error_mark_node) | |
9251 | return; | |
9252 | /* Look for the `=' token. */ | |
9253 | cp_parser_require (parser, CPP_EQ, "`='"); | |
9254 | /* Look for the qualified-namespace-specifier. */ | |
9255 | namespace_specifier | |
9256 | = cp_parser_qualified_namespace_specifier (parser); | |
9257 | /* Look for the `;' token. */ | |
9258 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
9259 | ||
9260 | /* Register the alias in the symbol table. */ | |
9261 | do_namespace_alias (identifier, namespace_specifier); | |
9262 | } | |
9263 | ||
9264 | /* Parse a qualified-namespace-specifier. | |
9265 | ||
9266 | qualified-namespace-specifier: | |
9267 | :: [opt] nested-name-specifier [opt] namespace-name | |
9268 | ||
9269 | Returns a NAMESPACE_DECL corresponding to the specified | |
9270 | namespace. */ | |
9271 | ||
9272 | static tree | |
9273 | cp_parser_qualified_namespace_specifier (parser) | |
9274 | cp_parser *parser; | |
9275 | { | |
9276 | /* Look for the optional `::'. */ | |
9277 | cp_parser_global_scope_opt (parser, | |
9278 | /*current_scope_valid_p=*/false); | |
9279 | ||
9280 | /* Look for the optional nested-name-specifier. */ | |
9281 | cp_parser_nested_name_specifier_opt (parser, | |
9282 | /*typename_keyword_p=*/false, | |
9283 | /*check_dependency_p=*/true, | |
9284 | /*type_p=*/false); | |
9285 | ||
9286 | return cp_parser_namespace_name (parser); | |
9287 | } | |
9288 | ||
9289 | /* Parse a using-declaration. | |
9290 | ||
9291 | using-declaration: | |
9292 | using typename [opt] :: [opt] nested-name-specifier unqualified-id ; | |
9293 | using :: unqualified-id ; */ | |
9294 | ||
9295 | static void | |
9296 | cp_parser_using_declaration (parser) | |
9297 | cp_parser *parser; | |
9298 | { | |
9299 | cp_token *token; | |
9300 | bool typename_p = false; | |
9301 | bool global_scope_p; | |
9302 | tree decl; | |
9303 | tree identifier; | |
9304 | tree scope; | |
9305 | ||
9306 | /* Look for the `using' keyword. */ | |
9307 | cp_parser_require_keyword (parser, RID_USING, "`using'"); | |
9308 | ||
9309 | /* Peek at the next token. */ | |
9310 | token = cp_lexer_peek_token (parser->lexer); | |
9311 | /* See if it's `typename'. */ | |
9312 | if (token->keyword == RID_TYPENAME) | |
9313 | { | |
9314 | /* Remember that we've seen it. */ | |
9315 | typename_p = true; | |
9316 | /* Consume the `typename' token. */ | |
9317 | cp_lexer_consume_token (parser->lexer); | |
9318 | } | |
9319 | ||
9320 | /* Look for the optional global scope qualification. */ | |
9321 | global_scope_p | |
9322 | = (cp_parser_global_scope_opt (parser, | |
9323 | /*current_scope_valid_p=*/false) | |
9324 | != NULL_TREE); | |
9325 | ||
9326 | /* If we saw `typename', or didn't see `::', then there must be a | |
9327 | nested-name-specifier present. */ | |
9328 | if (typename_p || !global_scope_p) | |
9329 | cp_parser_nested_name_specifier (parser, typename_p, | |
9330 | /*check_dependency_p=*/true, | |
9331 | /*type_p=*/false); | |
9332 | /* Otherwise, we could be in either of the two productions. In that | |
9333 | case, treat the nested-name-specifier as optional. */ | |
9334 | else | |
9335 | cp_parser_nested_name_specifier_opt (parser, | |
9336 | /*typename_keyword_p=*/false, | |
9337 | /*check_dependency_p=*/true, | |
9338 | /*type_p=*/false); | |
9339 | ||
9340 | /* Parse the unqualified-id. */ | |
9341 | identifier = cp_parser_unqualified_id (parser, | |
9342 | /*template_keyword_p=*/false, | |
9343 | /*check_dependency_p=*/true); | |
9344 | ||
9345 | /* The function we call to handle a using-declaration is different | |
9346 | depending on what scope we are in. */ | |
9347 | scope = current_scope (); | |
9348 | if (scope && TYPE_P (scope)) | |
9349 | { | |
9350 | /* Create the USING_DECL. */ | |
9351 | decl = do_class_using_decl (build_nt (SCOPE_REF, | |
9352 | parser->scope, | |
9353 | identifier)); | |
9354 | /* Add it to the list of members in this class. */ | |
9355 | finish_member_declaration (decl); | |
9356 | } | |
9357 | else | |
9358 | { | |
9359 | decl = cp_parser_lookup_name_simple (parser, identifier); | |
9360 | if (scope) | |
9361 | do_local_using_decl (decl); | |
9362 | else | |
9363 | do_toplevel_using_decl (decl); | |
9364 | } | |
9365 | ||
9366 | /* Look for the final `;'. */ | |
9367 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
9368 | } | |
9369 | ||
9370 | /* Parse a using-directive. | |
9371 | ||
9372 | using-directive: | |
9373 | using namespace :: [opt] nested-name-specifier [opt] | |
9374 | namespace-name ; */ | |
9375 | ||
9376 | static void | |
9377 | cp_parser_using_directive (parser) | |
9378 | cp_parser *parser; | |
9379 | { | |
9380 | tree namespace_decl; | |
9381 | ||
9382 | /* Look for the `using' keyword. */ | |
9383 | cp_parser_require_keyword (parser, RID_USING, "`using'"); | |
9384 | /* And the `namespace' keyword. */ | |
9385 | cp_parser_require_keyword (parser, RID_NAMESPACE, "`namespace'"); | |
9386 | /* Look for the optional `::' operator. */ | |
9387 | cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false); | |
9388 | /* And the optional nested-name-sepcifier. */ | |
9389 | cp_parser_nested_name_specifier_opt (parser, | |
9390 | /*typename_keyword_p=*/false, | |
9391 | /*check_dependency_p=*/true, | |
9392 | /*type_p=*/false); | |
9393 | /* Get the namespace being used. */ | |
9394 | namespace_decl = cp_parser_namespace_name (parser); | |
9395 | /* Update the symbol table. */ | |
9396 | do_using_directive (namespace_decl); | |
9397 | /* Look for the final `;'. */ | |
9398 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
9399 | } | |
9400 | ||
9401 | /* Parse an asm-definition. | |
9402 | ||
9403 | asm-definition: | |
9404 | asm ( string-literal ) ; | |
9405 | ||
9406 | GNU Extension: | |
9407 | ||
9408 | asm-definition: | |
9409 | asm volatile [opt] ( string-literal ) ; | |
9410 | asm volatile [opt] ( string-literal : asm-operand-list [opt] ) ; | |
9411 | asm volatile [opt] ( string-literal : asm-operand-list [opt] | |
9412 | : asm-operand-list [opt] ) ; | |
9413 | asm volatile [opt] ( string-literal : asm-operand-list [opt] | |
9414 | : asm-operand-list [opt] | |
9415 | : asm-operand-list [opt] ) ; */ | |
9416 | ||
9417 | static void | |
9418 | cp_parser_asm_definition (parser) | |
9419 | cp_parser *parser; | |
9420 | { | |
9421 | cp_token *token; | |
9422 | tree string; | |
9423 | tree outputs = NULL_TREE; | |
9424 | tree inputs = NULL_TREE; | |
9425 | tree clobbers = NULL_TREE; | |
9426 | tree asm_stmt; | |
9427 | bool volatile_p = false; | |
9428 | bool extended_p = false; | |
9429 | ||
9430 | /* Look for the `asm' keyword. */ | |
9431 | cp_parser_require_keyword (parser, RID_ASM, "`asm'"); | |
9432 | /* See if the next token is `volatile'. */ | |
9433 | if (cp_parser_allow_gnu_extensions_p (parser) | |
9434 | && cp_lexer_next_token_is_keyword (parser->lexer, RID_VOLATILE)) | |
9435 | { | |
9436 | /* Remember that we saw the `volatile' keyword. */ | |
9437 | volatile_p = true; | |
9438 | /* Consume the token. */ | |
9439 | cp_lexer_consume_token (parser->lexer); | |
9440 | } | |
9441 | /* Look for the opening `('. */ | |
9442 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
9443 | /* Look for the string. */ | |
9444 | token = cp_parser_require (parser, CPP_STRING, "asm body"); | |
9445 | if (!token) | |
9446 | return; | |
9447 | string = token->value; | |
9448 | /* If we're allowing GNU extensions, check for the extended assembly | |
9449 | syntax. Unfortunately, the `:' tokens need not be separated by | |
9450 | a space in C, and so, for compatibility, we tolerate that here | |
9451 | too. Doing that means that we have to treat the `::' operator as | |
9452 | two `:' tokens. */ | |
9453 | if (cp_parser_allow_gnu_extensions_p (parser) | |
9454 | && at_function_scope_p () | |
9455 | && (cp_lexer_next_token_is (parser->lexer, CPP_COLON) | |
9456 | || cp_lexer_next_token_is (parser->lexer, CPP_SCOPE))) | |
9457 | { | |
9458 | bool inputs_p = false; | |
9459 | bool clobbers_p = false; | |
9460 | ||
9461 | /* The extended syntax was used. */ | |
9462 | extended_p = true; | |
9463 | ||
9464 | /* Look for outputs. */ | |
9465 | if (cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
9466 | { | |
9467 | /* Consume the `:'. */ | |
9468 | cp_lexer_consume_token (parser->lexer); | |
9469 | /* Parse the output-operands. */ | |
9470 | if (cp_lexer_next_token_is_not (parser->lexer, | |
9471 | CPP_COLON) | |
9472 | && cp_lexer_next_token_is_not (parser->lexer, | |
9473 | CPP_SCOPE)) | |
9474 | outputs = cp_parser_asm_operand_list (parser); | |
9475 | } | |
9476 | /* If the next token is `::', there are no outputs, and the | |
9477 | next token is the beginning of the inputs. */ | |
9478 | else if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
9479 | { | |
9480 | /* Consume the `::' token. */ | |
9481 | cp_lexer_consume_token (parser->lexer); | |
9482 | /* The inputs are coming next. */ | |
9483 | inputs_p = true; | |
9484 | } | |
9485 | ||
9486 | /* Look for inputs. */ | |
9487 | if (inputs_p | |
9488 | || cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
9489 | { | |
9490 | if (!inputs_p) | |
9491 | /* Consume the `:'. */ | |
9492 | cp_lexer_consume_token (parser->lexer); | |
9493 | /* Parse the output-operands. */ | |
9494 | if (cp_lexer_next_token_is_not (parser->lexer, | |
9495 | CPP_COLON) | |
9496 | && cp_lexer_next_token_is_not (parser->lexer, | |
9497 | CPP_SCOPE)) | |
9498 | inputs = cp_parser_asm_operand_list (parser); | |
9499 | } | |
9500 | else if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
9501 | /* The clobbers are coming next. */ | |
9502 | clobbers_p = true; | |
9503 | ||
9504 | /* Look for clobbers. */ | |
9505 | if (clobbers_p | |
9506 | || cp_lexer_next_token_is (parser->lexer, CPP_COLON)) | |
9507 | { | |
9508 | if (!clobbers_p) | |
9509 | /* Consume the `:'. */ | |
9510 | cp_lexer_consume_token (parser->lexer); | |
9511 | /* Parse the clobbers. */ | |
9512 | clobbers = cp_parser_asm_clobber_list (parser); | |
9513 | } | |
9514 | } | |
9515 | /* Look for the closing `)'. */ | |
9516 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
9517 | cp_parser_skip_to_closing_parenthesis (parser); | |
9518 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
9519 | ||
9520 | /* Create the ASM_STMT. */ | |
9521 | if (at_function_scope_p ()) | |
9522 | { | |
9523 | asm_stmt = | |
9524 | finish_asm_stmt (volatile_p | |
9525 | ? ridpointers[(int) RID_VOLATILE] : NULL_TREE, | |
9526 | string, outputs, inputs, clobbers); | |
9527 | /* If the extended syntax was not used, mark the ASM_STMT. */ | |
9528 | if (!extended_p) | |
9529 | ASM_INPUT_P (asm_stmt) = 1; | |
9530 | } | |
9531 | else | |
9532 | assemble_asm (string); | |
9533 | } | |
9534 | ||
9535 | /* Declarators [gram.dcl.decl] */ | |
9536 | ||
9537 | /* Parse an init-declarator. | |
9538 | ||
9539 | init-declarator: | |
9540 | declarator initializer [opt] | |
9541 | ||
9542 | GNU Extension: | |
9543 | ||
9544 | init-declarator: | |
9545 | declarator asm-specification [opt] attributes [opt] initializer [opt] | |
9546 | ||
9547 | The DECL_SPECIFIERS and PREFIX_ATTRIBUTES apply to this declarator. | |
9548 | Returns a reprsentation of the entity declared. The ACCESS_CHECKS | |
9549 | represent deferred access checks from the decl-specifier-seq. If | |
9550 | MEMBER_P is TRUE, then this declarator appears in a class scope. | |
9551 | The new DECL created by this declarator is returned. | |
9552 | ||
9553 | If FUNCTION_DEFINITION_ALLOWED_P then we handle the declarator and | |
9554 | for a function-definition here as well. If the declarator is a | |
9555 | declarator for a function-definition, *FUNCTION_DEFINITION_P will | |
9556 | be TRUE upon return. By that point, the function-definition will | |
9557 | have been completely parsed. | |
9558 | ||
9559 | FUNCTION_DEFINITION_P may be NULL if FUNCTION_DEFINITION_ALLOWED_P | |
9560 | is FALSE. */ | |
9561 | ||
9562 | static tree | |
9563 | cp_parser_init_declarator (parser, | |
9564 | decl_specifiers, | |
9565 | prefix_attributes, | |
9566 | access_checks, | |
9567 | function_definition_allowed_p, | |
9568 | member_p, | |
9569 | function_definition_p) | |
9570 | cp_parser *parser; | |
9571 | tree decl_specifiers; | |
9572 | tree prefix_attributes; | |
9573 | tree access_checks; | |
9574 | bool function_definition_allowed_p; | |
9575 | bool member_p; | |
9576 | bool *function_definition_p; | |
9577 | { | |
9578 | cp_token *token; | |
9579 | tree declarator; | |
9580 | tree attributes; | |
9581 | tree asm_specification; | |
9582 | tree initializer; | |
9583 | tree decl = NULL_TREE; | |
9584 | tree scope; | |
9585 | tree declarator_access_checks; | |
9586 | bool is_initialized; | |
9587 | bool is_parenthesized_init; | |
9588 | bool ctor_dtor_or_conv_p; | |
9589 | bool friend_p; | |
9590 | ||
9591 | /* Assume that this is not the declarator for a function | |
9592 | definition. */ | |
9593 | if (function_definition_p) | |
9594 | *function_definition_p = false; | |
9595 | ||
9596 | /* Defer access checks while parsing the declarator; we cannot know | |
9597 | what names are accessible until we know what is being | |
9598 | declared. */ | |
9599 | cp_parser_start_deferring_access_checks (parser); | |
9600 | /* Parse the declarator. */ | |
9601 | declarator | |
9602 | = cp_parser_declarator (parser, | |
9603 | /*abstract_p=*/false, | |
9604 | &ctor_dtor_or_conv_p); | |
9605 | /* Gather up the deferred checks. */ | |
9606 | declarator_access_checks | |
9607 | = cp_parser_stop_deferring_access_checks (parser); | |
9608 | ||
9609 | /* If the DECLARATOR was erroneous, there's no need to go | |
9610 | further. */ | |
9611 | if (declarator == error_mark_node) | |
9612 | return error_mark_node; | |
9613 | ||
9614 | /* Figure out what scope the entity declared by the DECLARATOR is | |
9615 | located in. `grokdeclarator' sometimes changes the scope, so | |
9616 | we compute it now. */ | |
9617 | scope = get_scope_of_declarator (declarator); | |
9618 | ||
9619 | /* If we're allowing GNU extensions, look for an asm-specification | |
9620 | and attributes. */ | |
9621 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
9622 | { | |
9623 | /* Look for an asm-specification. */ | |
9624 | asm_specification = cp_parser_asm_specification_opt (parser); | |
9625 | /* And attributes. */ | |
9626 | attributes = cp_parser_attributes_opt (parser); | |
9627 | } | |
9628 | else | |
9629 | { | |
9630 | asm_specification = NULL_TREE; | |
9631 | attributes = NULL_TREE; | |
9632 | } | |
9633 | ||
9634 | /* Peek at the next token. */ | |
9635 | token = cp_lexer_peek_token (parser->lexer); | |
9636 | /* Check to see if the token indicates the start of a | |
9637 | function-definition. */ | |
9638 | if (cp_parser_token_starts_function_definition_p (token)) | |
9639 | { | |
9640 | if (!function_definition_allowed_p) | |
9641 | { | |
9642 | /* If a function-definition should not appear here, issue an | |
9643 | error message. */ | |
9644 | cp_parser_error (parser, | |
9645 | "a function-definition is not allowed here"); | |
9646 | return error_mark_node; | |
9647 | } | |
9648 | else | |
9649 | { | |
9650 | tree *ac; | |
9651 | ||
9652 | /* Neither attributes nor an asm-specification are allowed | |
9653 | on a function-definition. */ | |
9654 | if (asm_specification) | |
9655 | error ("an asm-specification is not allowed on a function-definition"); | |
9656 | if (attributes) | |
9657 | error ("attributes are not allowed on a function-definition"); | |
9658 | /* This is a function-definition. */ | |
9659 | *function_definition_p = true; | |
9660 | ||
9661 | /* Thread the access checks together. */ | |
9662 | ac = &access_checks; | |
9663 | while (*ac) | |
9664 | ac = &TREE_CHAIN (*ac); | |
9665 | *ac = declarator_access_checks; | |
9666 | ||
9667 | /* Parse the function definition. */ | |
9668 | decl = (cp_parser_function_definition_from_specifiers_and_declarator | |
9669 | (parser, decl_specifiers, prefix_attributes, declarator, | |
9670 | access_checks)); | |
9671 | ||
9672 | /* Pull the access-checks apart again. */ | |
9673 | *ac = NULL_TREE; | |
9674 | ||
9675 | return decl; | |
9676 | } | |
9677 | } | |
9678 | ||
9679 | /* [dcl.dcl] | |
9680 | ||
9681 | Only in function declarations for constructors, destructors, and | |
9682 | type conversions can the decl-specifier-seq be omitted. | |
9683 | ||
9684 | We explicitly postpone this check past the point where we handle | |
9685 | function-definitions because we tolerate function-definitions | |
9686 | that are missing their return types in some modes. */ | |
9687 | if (!decl_specifiers && !ctor_dtor_or_conv_p) | |
9688 | { | |
9689 | cp_parser_error (parser, | |
9690 | "expected constructor, destructor, or type conversion"); | |
9691 | return error_mark_node; | |
9692 | } | |
9693 | ||
9694 | /* An `=' or an `(' indicates an initializer. */ | |
9695 | is_initialized = (token->type == CPP_EQ | |
9696 | || token->type == CPP_OPEN_PAREN); | |
9697 | /* If the init-declarator isn't initialized and isn't followed by a | |
9698 | `,' or `;', it's not a valid init-declarator. */ | |
9699 | if (!is_initialized | |
9700 | && token->type != CPP_COMMA | |
9701 | && token->type != CPP_SEMICOLON) | |
9702 | { | |
9703 | cp_parser_error (parser, "expected init-declarator"); | |
9704 | return error_mark_node; | |
9705 | } | |
9706 | ||
9707 | /* Because start_decl has side-effects, we should only call it if we | |
9708 | know we're going ahead. By this point, we know that we cannot | |
9709 | possibly be looking at any other construct. */ | |
9710 | cp_parser_commit_to_tentative_parse (parser); | |
9711 | ||
9712 | /* Check to see whether or not this declaration is a friend. */ | |
9713 | friend_p = cp_parser_friend_p (decl_specifiers); | |
9714 | ||
9715 | /* Check that the number of template-parameter-lists is OK. */ | |
9716 | if (!cp_parser_check_declarator_template_parameters (parser, | |
9717 | declarator)) | |
9718 | return error_mark_node; | |
9719 | ||
9720 | /* Enter the newly declared entry in the symbol table. If we're | |
9721 | processing a declaration in a class-specifier, we wait until | |
9722 | after processing the initializer. */ | |
9723 | if (!member_p) | |
9724 | { | |
9725 | if (parser->in_unbraced_linkage_specification_p) | |
9726 | { | |
9727 | decl_specifiers = tree_cons (error_mark_node, | |
9728 | get_identifier ("extern"), | |
9729 | decl_specifiers); | |
9730 | have_extern_spec = false; | |
9731 | } | |
9732 | decl = start_decl (declarator, | |
9733 | decl_specifiers, | |
9734 | is_initialized, | |
9735 | attributes, | |
9736 | prefix_attributes); | |
9737 | } | |
9738 | ||
9739 | /* Enter the SCOPE. That way unqualified names appearing in the | |
9740 | initializer will be looked up in SCOPE. */ | |
9741 | if (scope) | |
9742 | push_scope (scope); | |
9743 | ||
9744 | /* Perform deferred access control checks, now that we know in which | |
9745 | SCOPE the declared entity resides. */ | |
9746 | if (!member_p && decl) | |
9747 | { | |
9748 | tree saved_current_function_decl = NULL_TREE; | |
9749 | ||
9750 | /* If the entity being declared is a function, pretend that we | |
9751 | are in its scope. If it is a `friend', it may have access to | |
9752 | things that would not otherwise be accessible. */ | |
9753 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
9754 | { | |
9755 | saved_current_function_decl = current_function_decl; | |
9756 | current_function_decl = decl; | |
9757 | } | |
9758 | ||
9759 | /* Perform the access control checks for the decl-specifiers. */ | |
9760 | cp_parser_perform_deferred_access_checks (access_checks); | |
9761 | /* And for the declarator. */ | |
9762 | cp_parser_perform_deferred_access_checks (declarator_access_checks); | |
9763 | ||
9764 | /* Restore the saved value. */ | |
9765 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
9766 | current_function_decl = saved_current_function_decl; | |
9767 | } | |
9768 | ||
9769 | /* Parse the initializer. */ | |
9770 | if (is_initialized) | |
9771 | initializer = cp_parser_initializer (parser, | |
9772 | &is_parenthesized_init); | |
9773 | else | |
9774 | { | |
9775 | initializer = NULL_TREE; | |
9776 | is_parenthesized_init = false; | |
9777 | } | |
9778 | ||
9779 | /* The old parser allows attributes to appear after a parenthesized | |
9780 | initializer. Mark Mitchell proposed removing this functionality | |
9781 | on the GCC mailing lists on 2002-08-13. This parser accepts the | |
9782 | attributes -- but ignores them. */ | |
9783 | if (cp_parser_allow_gnu_extensions_p (parser) && is_parenthesized_init) | |
9784 | if (cp_parser_attributes_opt (parser)) | |
9785 | warning ("attributes after parenthesized initializer ignored"); | |
9786 | ||
9787 | /* Leave the SCOPE, now that we have processed the initializer. It | |
9788 | is important to do this before calling cp_finish_decl because it | |
9789 | makes decisions about whether to create DECL_STMTs or not based | |
9790 | on the current scope. */ | |
9791 | if (scope) | |
9792 | pop_scope (scope); | |
9793 | ||
9794 | /* For an in-class declaration, use `grokfield' to create the | |
9795 | declaration. */ | |
9796 | if (member_p) | |
9797 | decl = grokfield (declarator, decl_specifiers, | |
9798 | initializer, /*asmspec=*/NULL_TREE, | |
9799 | /*attributes=*/NULL_TREE); | |
9800 | ||
9801 | /* Finish processing the declaration. But, skip friend | |
9802 | declarations. */ | |
9803 | if (!friend_p && decl) | |
9804 | cp_finish_decl (decl, | |
9805 | initializer, | |
9806 | asm_specification, | |
9807 | /* If the initializer is in parentheses, then this is | |
9808 | a direct-initialization, which means that an | |
9809 | `explicit' constructor is OK. Otherwise, an | |
9810 | `explicit' constructor cannot be used. */ | |
9811 | ((is_parenthesized_init || !is_initialized) | |
9812 | ? 0 : LOOKUP_ONLYCONVERTING)); | |
9813 | ||
9814 | return decl; | |
9815 | } | |
9816 | ||
9817 | /* Parse a declarator. | |
9818 | ||
9819 | declarator: | |
9820 | direct-declarator | |
9821 | ptr-operator declarator | |
9822 | ||
9823 | abstract-declarator: | |
9824 | ptr-operator abstract-declarator [opt] | |
9825 | direct-abstract-declarator | |
9826 | ||
9827 | GNU Extensions: | |
9828 | ||
9829 | declarator: | |
9830 | attributes [opt] direct-declarator | |
9831 | attributes [opt] ptr-operator declarator | |
9832 | ||
9833 | abstract-declarator: | |
9834 | attributes [opt] ptr-operator abstract-declarator [opt] | |
9835 | attributes [opt] direct-abstract-declarator | |
9836 | ||
9837 | Returns a representation of the declarator. If the declarator has | |
9838 | the form `* declarator', then an INDIRECT_REF is returned, whose | |
9839 | only operand is the sub-declarator. Analagously, `& declarator' is | |
9840 | represented as an ADDR_EXPR. For `X::* declarator', a SCOPE_REF is | |
9841 | used. The first operand is the TYPE for `X'. The second operand | |
9842 | is an INDIRECT_REF whose operand is the sub-declarator. | |
9843 | ||
9844 | Otherwise, the reprsentation is as for a direct-declarator. | |
9845 | ||
9846 | (It would be better to define a structure type to represent | |
9847 | declarators, rather than abusing `tree' nodes to represent | |
9848 | declarators. That would be much clearer and save some memory. | |
9849 | There is no reason for declarators to be garbage-collected, for | |
9850 | example; they are created during parser and no longer needed after | |
9851 | `grokdeclarator' has been called.) | |
9852 | ||
9853 | For a ptr-operator that has the optional cv-qualifier-seq, | |
9854 | cv-qualifiers will be stored in the TREE_TYPE of the INDIRECT_REF | |
9855 | node. | |
9856 | ||
9857 | If CTOR_DTOR_OR_CONV_P is not NULL, *CTOR_DTOR_OR_CONV_P is set to | |
9858 | true if this declarator represents a constructor, destructor, or | |
9859 | type conversion operator. Otherwise, it is set to false. | |
9860 | ||
9861 | (The reason for CTOR_DTOR_OR_CONV_P is that a declaration must have | |
9862 | a decl-specifier-seq unless it declares a constructor, destructor, | |
9863 | or conversion. It might seem that we could check this condition in | |
9864 | semantic analysis, rather than parsing, but that makes it difficult | |
9865 | to handle something like `f()'. We want to notice that there are | |
9866 | no decl-specifiers, and therefore realize that this is an | |
9867 | expression, not a declaration.) */ | |
9868 | ||
9869 | static tree | |
9870 | cp_parser_declarator (parser, abstract_p, ctor_dtor_or_conv_p) | |
9871 | cp_parser *parser; | |
9872 | bool abstract_p; | |
9873 | bool *ctor_dtor_or_conv_p; | |
9874 | { | |
9875 | cp_token *token; | |
9876 | tree declarator; | |
9877 | enum tree_code code; | |
9878 | tree cv_qualifier_seq; | |
9879 | tree class_type; | |
9880 | tree attributes = NULL_TREE; | |
9881 | ||
9882 | /* Assume this is not a constructor, destructor, or type-conversion | |
9883 | operator. */ | |
9884 | if (ctor_dtor_or_conv_p) | |
9885 | *ctor_dtor_or_conv_p = false; | |
9886 | ||
9887 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
9888 | attributes = cp_parser_attributes_opt (parser); | |
9889 | ||
9890 | /* Peek at the next token. */ | |
9891 | token = cp_lexer_peek_token (parser->lexer); | |
9892 | ||
9893 | /* Check for the ptr-operator production. */ | |
9894 | cp_parser_parse_tentatively (parser); | |
9895 | /* Parse the ptr-operator. */ | |
9896 | code = cp_parser_ptr_operator (parser, | |
9897 | &class_type, | |
9898 | &cv_qualifier_seq); | |
9899 | /* If that worked, then we have a ptr-operator. */ | |
9900 | if (cp_parser_parse_definitely (parser)) | |
9901 | { | |
9902 | /* The dependent declarator is optional if we are parsing an | |
9903 | abstract-declarator. */ | |
9904 | if (abstract_p) | |
9905 | cp_parser_parse_tentatively (parser); | |
9906 | ||
9907 | /* Parse the dependent declarator. */ | |
9908 | declarator = cp_parser_declarator (parser, abstract_p, | |
9909 | /*ctor_dtor_or_conv_p=*/NULL); | |
9910 | ||
9911 | /* If we are parsing an abstract-declarator, we must handle the | |
9912 | case where the dependent declarator is absent. */ | |
9913 | if (abstract_p && !cp_parser_parse_definitely (parser)) | |
9914 | declarator = NULL_TREE; | |
9915 | ||
9916 | /* Build the representation of the ptr-operator. */ | |
9917 | if (code == INDIRECT_REF) | |
9918 | declarator = make_pointer_declarator (cv_qualifier_seq, | |
9919 | declarator); | |
9920 | else | |
9921 | declarator = make_reference_declarator (cv_qualifier_seq, | |
9922 | declarator); | |
9923 | /* Handle the pointer-to-member case. */ | |
9924 | if (class_type) | |
9925 | declarator = build_nt (SCOPE_REF, class_type, declarator); | |
9926 | } | |
9927 | /* Everything else is a direct-declarator. */ | |
9928 | else | |
9929 | declarator = cp_parser_direct_declarator (parser, | |
9930 | abstract_p, | |
9931 | ctor_dtor_or_conv_p); | |
9932 | ||
9933 | if (attributes && declarator != error_mark_node) | |
9934 | declarator = tree_cons (attributes, declarator, NULL_TREE); | |
9935 | ||
9936 | return declarator; | |
9937 | } | |
9938 | ||
9939 | /* Parse a direct-declarator or direct-abstract-declarator. | |
9940 | ||
9941 | direct-declarator: | |
9942 | declarator-id | |
9943 | direct-declarator ( parameter-declaration-clause ) | |
9944 | cv-qualifier-seq [opt] | |
9945 | exception-specification [opt] | |
9946 | direct-declarator [ constant-expression [opt] ] | |
9947 | ( declarator ) | |
9948 | ||
9949 | direct-abstract-declarator: | |
9950 | direct-abstract-declarator [opt] | |
9951 | ( parameter-declaration-clause ) | |
9952 | cv-qualifier-seq [opt] | |
9953 | exception-specification [opt] | |
9954 | direct-abstract-declarator [opt] [ constant-expression [opt] ] | |
9955 | ( abstract-declarator ) | |
9956 | ||
9957 | Returns a representation of the declarator. ABSTRACT_P is TRUE if | |
9958 | we are parsing a direct-abstract-declarator; FALSE if we are | |
9959 | parsing a direct-declarator. CTOR_DTOR_OR_CONV_P is as for | |
9960 | cp_parser_declarator. | |
9961 | ||
9962 | For the declarator-id production, the representation is as for an | |
9963 | id-expression, except that a qualified name is represented as a | |
9964 | SCOPE_REF. A function-declarator is represented as a CALL_EXPR; | |
9965 | see the documentation of the FUNCTION_DECLARATOR_* macros for | |
9966 | information about how to find the various declarator components. | |
9967 | An array-declarator is represented as an ARRAY_REF. The | |
9968 | direct-declarator is the first operand; the constant-expression | |
9969 | indicating the size of the array is the second operand. */ | |
9970 | ||
9971 | static tree | |
9972 | cp_parser_direct_declarator (parser, abstract_p, ctor_dtor_or_conv_p) | |
9973 | cp_parser *parser; | |
9974 | bool abstract_p; | |
9975 | bool *ctor_dtor_or_conv_p; | |
9976 | { | |
9977 | cp_token *token; | |
9978 | tree declarator; | |
9979 | tree scope = NULL_TREE; | |
9980 | bool saved_default_arg_ok_p = parser->default_arg_ok_p; | |
9981 | bool saved_in_declarator_p = parser->in_declarator_p; | |
9982 | ||
9983 | /* Peek at the next token. */ | |
9984 | token = cp_lexer_peek_token (parser->lexer); | |
9985 | /* Find the initial direct-declarator. It might be a parenthesized | |
9986 | declarator. */ | |
9987 | if (token->type == CPP_OPEN_PAREN) | |
9988 | { | |
9989 | /* For an abstract declarator we do not know whether we are | |
9990 | looking at the beginning of a parameter-declaration-clause, | |
9991 | or at a parenthesized abstract declarator. For example, if | |
9992 | we see `(int)', we are looking at a | |
9993 | parameter-declaration-clause, and the | |
9994 | direct-abstract-declarator has been omitted. If, on the | |
9995 | other hand we are looking at `((*))' then we are looking at a | |
9996 | parenthesized abstract-declarator. There is no easy way to | |
9997 | tell which situation we are in. */ | |
9998 | if (abstract_p) | |
9999 | cp_parser_parse_tentatively (parser); | |
10000 | ||
10001 | /* Consume the `('. */ | |
10002 | cp_lexer_consume_token (parser->lexer); | |
10003 | /* Parse the nested declarator. */ | |
10004 | declarator | |
10005 | = cp_parser_declarator (parser, abstract_p, ctor_dtor_or_conv_p); | |
10006 | /* Expect a `)'. */ | |
10007 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
10008 | ||
10009 | /* If parsing a parenthesized abstract declarator didn't work, | |
10010 | try a parameter-declaration-clause. */ | |
10011 | if (abstract_p && !cp_parser_parse_definitely (parser)) | |
10012 | declarator = NULL_TREE; | |
10013 | /* If we were not parsing an abstract declarator, but failed to | |
10014 | find a satisfactory nested declarator, then an error has | |
10015 | occurred. */ | |
10016 | else if (!abstract_p && declarator == error_mark_node) | |
10017 | return error_mark_node; | |
10018 | /* Default args cannot appear in an abstract decl. */ | |
10019 | parser->default_arg_ok_p = false; | |
10020 | } | |
10021 | /* Otherwise, for a non-abstract declarator, there should be a | |
10022 | declarator-id. */ | |
10023 | else if (!abstract_p) | |
10024 | { | |
10025 | declarator = cp_parser_declarator_id (parser); | |
10026 | ||
10027 | if (TREE_CODE (declarator) == SCOPE_REF) | |
10028 | { | |
10029 | scope = TREE_OPERAND (declarator, 0); | |
10030 | ||
10031 | /* In the declaration of a member of a template class | |
10032 | outside of the class itself, the SCOPE will sometimes be | |
10033 | a TYPENAME_TYPE. For example, given: | |
10034 | ||
10035 | template <typename T> | |
10036 | int S<T>::R::i = 3; | |
10037 | ||
10038 | the SCOPE will be a TYPENAME_TYPE for `S<T>::R'. In this | |
10039 | context, we must resolve S<T>::R to an ordinary type, | |
10040 | rather than a typename type. | |
10041 | ||
10042 | The reason we normally avoid resolving TYPENAME_TYPEs is | |
10043 | that a specialization of `S' might render `S<T>::R' not a | |
10044 | type. However, if `S' is specialized, then this `i' will | |
10045 | not be used, so there is no harm in resolving the types | |
10046 | here. */ | |
10047 | if (TREE_CODE (scope) == TYPENAME_TYPE) | |
10048 | { | |
10049 | /* Resolve the TYPENAME_TYPE. */ | |
10050 | scope = cp_parser_resolve_typename_type (parser, scope); | |
10051 | /* If that failed, the declarator is invalid. */ | |
10052 | if (scope == error_mark_node) | |
10053 | return error_mark_node; | |
10054 | /* Build a new DECLARATOR. */ | |
10055 | declarator = build_nt (SCOPE_REF, | |
10056 | scope, | |
10057 | TREE_OPERAND (declarator, 1)); | |
10058 | } | |
10059 | } | |
10060 | else if (TREE_CODE (declarator) != IDENTIFIER_NODE) | |
10061 | /* Default args can only appear for a function decl. */ | |
10062 | parser->default_arg_ok_p = false; | |
10063 | ||
10064 | /* Check to see whether the declarator-id names a constructor, | |
10065 | destructor, or conversion. */ | |
10066 | if (ctor_dtor_or_conv_p | |
10067 | && ((TREE_CODE (declarator) == SCOPE_REF | |
10068 | && CLASS_TYPE_P (TREE_OPERAND (declarator, 0))) | |
10069 | || (TREE_CODE (declarator) != SCOPE_REF | |
10070 | && at_class_scope_p ()))) | |
10071 | { | |
10072 | tree unqualified_name; | |
10073 | tree class_type; | |
10074 | ||
10075 | /* Get the unqualified part of the name. */ | |
10076 | if (TREE_CODE (declarator) == SCOPE_REF) | |
10077 | { | |
10078 | class_type = TREE_OPERAND (declarator, 0); | |
10079 | unqualified_name = TREE_OPERAND (declarator, 1); | |
10080 | } | |
10081 | else | |
10082 | { | |
10083 | class_type = current_class_type; | |
10084 | unqualified_name = declarator; | |
10085 | } | |
10086 | ||
10087 | /* See if it names ctor, dtor or conv. */ | |
10088 | if (TREE_CODE (unqualified_name) == BIT_NOT_EXPR | |
10089 | || IDENTIFIER_TYPENAME_P (unqualified_name) | |
10090 | || constructor_name_p (unqualified_name, class_type)) | |
10091 | { | |
10092 | *ctor_dtor_or_conv_p = true; | |
10093 | /* We would have cleared the default arg flag above, but | |
10094 | they are ok. */ | |
10095 | parser->default_arg_ok_p = saved_default_arg_ok_p; | |
10096 | } | |
10097 | } | |
10098 | } | |
10099 | /* But for an abstract declarator, the initial direct-declarator can | |
10100 | be omitted. */ | |
10101 | else | |
10102 | { | |
10103 | declarator = NULL_TREE; | |
10104 | parser->default_arg_ok_p = false; | |
10105 | } | |
10106 | ||
10107 | scope = get_scope_of_declarator (declarator); | |
10108 | if (scope) | |
10109 | /* Any names that appear after the declarator-id for a member | |
10110 | are looked up in the containing scope. */ | |
10111 | push_scope (scope); | |
10112 | else | |
10113 | scope = NULL_TREE; | |
10114 | parser->in_declarator_p = true; | |
10115 | ||
10116 | /* Now, parse function-declarators and array-declarators until there | |
10117 | are no more. */ | |
10118 | while (true) | |
10119 | { | |
10120 | /* Peek at the next token. */ | |
10121 | token = cp_lexer_peek_token (parser->lexer); | |
10122 | /* If it's a `[', we're looking at an array-declarator. */ | |
10123 | if (token->type == CPP_OPEN_SQUARE) | |
10124 | { | |
10125 | tree bounds; | |
10126 | ||
10127 | /* Consume the `['. */ | |
10128 | cp_lexer_consume_token (parser->lexer); | |
10129 | /* Peek at the next token. */ | |
10130 | token = cp_lexer_peek_token (parser->lexer); | |
10131 | /* If the next token is `]', then there is no | |
10132 | constant-expression. */ | |
10133 | if (token->type != CPP_CLOSE_SQUARE) | |
10134 | bounds = cp_parser_constant_expression (parser); | |
10135 | else | |
10136 | bounds = NULL_TREE; | |
10137 | /* Look for the closing `]'. */ | |
10138 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
10139 | ||
10140 | declarator = build_nt (ARRAY_REF, declarator, bounds); | |
10141 | } | |
10142 | /* If it's a `(', we're looking at a function-declarator. */ | |
10143 | else if (token->type == CPP_OPEN_PAREN) | |
10144 | { | |
10145 | /* A function-declarator. Or maybe not. Consider, for | |
10146 | example: | |
10147 | ||
10148 | int i (int); | |
10149 | int i (3); | |
10150 | ||
10151 | The first is the declaration of a function while the | |
10152 | second is a the definition of a variable, including its | |
10153 | initializer. | |
10154 | ||
10155 | Having seen only the parenthesis, we cannot know which of | |
10156 | these two alternatives should be selected. Even more | |
10157 | complex are examples like: | |
10158 | ||
10159 | int i (int (a)); | |
10160 | int i (int (3)); | |
10161 | ||
10162 | The former is a function-declaration; the latter is a | |
10163 | variable initialization. | |
10164 | ||
10165 | First, we attempt to parse a parameter-declaration | |
10166 | clause. If this works, then we continue; otherwise, we | |
10167 | replace the tokens consumed in the process and continue. */ | |
10168 | tree params; | |
10169 | ||
10170 | /* We are now parsing tentatively. */ | |
10171 | cp_parser_parse_tentatively (parser); | |
10172 | ||
10173 | /* Consume the `('. */ | |
10174 | cp_lexer_consume_token (parser->lexer); | |
10175 | /* Parse the parameter-declaration-clause. */ | |
10176 | params = cp_parser_parameter_declaration_clause (parser); | |
10177 | ||
10178 | /* If all went well, parse the cv-qualifier-seq and the | |
10179 | exception-specification. */ | |
10180 | if (cp_parser_parse_definitely (parser)) | |
10181 | { | |
10182 | tree cv_qualifiers; | |
10183 | tree exception_specification; | |
10184 | ||
10185 | /* Consume the `)'. */ | |
10186 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
10187 | ||
10188 | /* Parse the cv-qualifier-seq. */ | |
10189 | cv_qualifiers = cp_parser_cv_qualifier_seq_opt (parser); | |
10190 | /* And the exception-specification. */ | |
10191 | exception_specification | |
10192 | = cp_parser_exception_specification_opt (parser); | |
10193 | ||
10194 | /* Create the function-declarator. */ | |
10195 | declarator = make_call_declarator (declarator, | |
10196 | params, | |
10197 | cv_qualifiers, | |
10198 | exception_specification); | |
10199 | } | |
10200 | /* Otherwise, we must be done with the declarator. */ | |
10201 | else | |
10202 | break; | |
10203 | } | |
10204 | /* Otherwise, we're done with the declarator. */ | |
10205 | else | |
10206 | break; | |
10207 | /* Any subsequent parameter lists are to do with return type, so | |
10208 | are not those of the declared function. */ | |
10209 | parser->default_arg_ok_p = false; | |
10210 | } | |
10211 | ||
10212 | /* For an abstract declarator, we might wind up with nothing at this | |
10213 | point. That's an error; the declarator is not optional. */ | |
10214 | if (!declarator) | |
10215 | cp_parser_error (parser, "expected declarator"); | |
10216 | ||
10217 | /* If we entered a scope, we must exit it now. */ | |
10218 | if (scope) | |
10219 | pop_scope (scope); | |
10220 | ||
10221 | parser->default_arg_ok_p = saved_default_arg_ok_p; | |
10222 | parser->in_declarator_p = saved_in_declarator_p; | |
10223 | ||
10224 | return declarator; | |
10225 | } | |
10226 | ||
10227 | /* Parse a ptr-operator. | |
10228 | ||
10229 | ptr-operator: | |
10230 | * cv-qualifier-seq [opt] | |
10231 | & | |
10232 | :: [opt] nested-name-specifier * cv-qualifier-seq [opt] | |
10233 | ||
10234 | GNU Extension: | |
10235 | ||
10236 | ptr-operator: | |
10237 | & cv-qualifier-seq [opt] | |
10238 | ||
10239 | Returns INDIRECT_REF if a pointer, or pointer-to-member, was | |
10240 | used. Returns ADDR_EXPR if a reference was used. In the | |
10241 | case of a pointer-to-member, *TYPE is filled in with the | |
10242 | TYPE containing the member. *CV_QUALIFIER_SEQ is filled in | |
10243 | with the cv-qualifier-seq, or NULL_TREE, if there are no | |
10244 | cv-qualifiers. Returns ERROR_MARK if an error occurred. */ | |
10245 | ||
10246 | static enum tree_code | |
10247 | cp_parser_ptr_operator (parser, type, cv_qualifier_seq) | |
10248 | cp_parser *parser; | |
10249 | tree *type; | |
10250 | tree *cv_qualifier_seq; | |
10251 | { | |
10252 | enum tree_code code = ERROR_MARK; | |
10253 | cp_token *token; | |
10254 | ||
10255 | /* Assume that it's not a pointer-to-member. */ | |
10256 | *type = NULL_TREE; | |
10257 | /* And that there are no cv-qualifiers. */ | |
10258 | *cv_qualifier_seq = NULL_TREE; | |
10259 | ||
10260 | /* Peek at the next token. */ | |
10261 | token = cp_lexer_peek_token (parser->lexer); | |
10262 | /* If it's a `*' or `&' we have a pointer or reference. */ | |
10263 | if (token->type == CPP_MULT || token->type == CPP_AND) | |
10264 | { | |
10265 | /* Remember which ptr-operator we were processing. */ | |
10266 | code = (token->type == CPP_AND ? ADDR_EXPR : INDIRECT_REF); | |
10267 | ||
10268 | /* Consume the `*' or `&'. */ | |
10269 | cp_lexer_consume_token (parser->lexer); | |
10270 | ||
10271 | /* A `*' can be followed by a cv-qualifier-seq, and so can a | |
10272 | `&', if we are allowing GNU extensions. (The only qualifier | |
10273 | that can legally appear after `&' is `restrict', but that is | |
10274 | enforced during semantic analysis. */ | |
10275 | if (code == INDIRECT_REF | |
10276 | || cp_parser_allow_gnu_extensions_p (parser)) | |
10277 | *cv_qualifier_seq = cp_parser_cv_qualifier_seq_opt (parser); | |
10278 | } | |
10279 | else | |
10280 | { | |
10281 | /* Try the pointer-to-member case. */ | |
10282 | cp_parser_parse_tentatively (parser); | |
10283 | /* Look for the optional `::' operator. */ | |
10284 | cp_parser_global_scope_opt (parser, | |
10285 | /*current_scope_valid_p=*/false); | |
10286 | /* Look for the nested-name specifier. */ | |
10287 | cp_parser_nested_name_specifier (parser, | |
10288 | /*typename_keyword_p=*/false, | |
10289 | /*check_dependency_p=*/true, | |
10290 | /*type_p=*/false); | |
10291 | /* If we found it, and the next token is a `*', then we are | |
10292 | indeed looking at a pointer-to-member operator. */ | |
10293 | if (!cp_parser_error_occurred (parser) | |
10294 | && cp_parser_require (parser, CPP_MULT, "`*'")) | |
10295 | { | |
10296 | /* The type of which the member is a member is given by the | |
10297 | current SCOPE. */ | |
10298 | *type = parser->scope; | |
10299 | /* The next name will not be qualified. */ | |
10300 | parser->scope = NULL_TREE; | |
10301 | parser->qualifying_scope = NULL_TREE; | |
10302 | parser->object_scope = NULL_TREE; | |
10303 | /* Indicate that the `*' operator was used. */ | |
10304 | code = INDIRECT_REF; | |
10305 | /* Look for the optional cv-qualifier-seq. */ | |
10306 | *cv_qualifier_seq = cp_parser_cv_qualifier_seq_opt (parser); | |
10307 | } | |
10308 | /* If that didn't work we don't have a ptr-operator. */ | |
10309 | if (!cp_parser_parse_definitely (parser)) | |
10310 | cp_parser_error (parser, "expected ptr-operator"); | |
10311 | } | |
10312 | ||
10313 | return code; | |
10314 | } | |
10315 | ||
10316 | /* Parse an (optional) cv-qualifier-seq. | |
10317 | ||
10318 | cv-qualifier-seq: | |
10319 | cv-qualifier cv-qualifier-seq [opt] | |
10320 | ||
10321 | Returns a TREE_LIST. The TREE_VALUE of each node is the | |
10322 | representation of a cv-qualifier. */ | |
10323 | ||
10324 | static tree | |
10325 | cp_parser_cv_qualifier_seq_opt (parser) | |
10326 | cp_parser *parser; | |
10327 | { | |
10328 | tree cv_qualifiers = NULL_TREE; | |
10329 | ||
10330 | while (true) | |
10331 | { | |
10332 | tree cv_qualifier; | |
10333 | ||
10334 | /* Look for the next cv-qualifier. */ | |
10335 | cv_qualifier = cp_parser_cv_qualifier_opt (parser); | |
10336 | /* If we didn't find one, we're done. */ | |
10337 | if (!cv_qualifier) | |
10338 | break; | |
10339 | ||
10340 | /* Add this cv-qualifier to the list. */ | |
10341 | cv_qualifiers | |
10342 | = tree_cons (NULL_TREE, cv_qualifier, cv_qualifiers); | |
10343 | } | |
10344 | ||
10345 | /* We built up the list in reverse order. */ | |
10346 | return nreverse (cv_qualifiers); | |
10347 | } | |
10348 | ||
10349 | /* Parse an (optional) cv-qualifier. | |
10350 | ||
10351 | cv-qualifier: | |
10352 | const | |
10353 | volatile | |
10354 | ||
10355 | GNU Extension: | |
10356 | ||
10357 | cv-qualifier: | |
10358 | __restrict__ */ | |
10359 | ||
10360 | static tree | |
10361 | cp_parser_cv_qualifier_opt (parser) | |
10362 | cp_parser *parser; | |
10363 | { | |
10364 | cp_token *token; | |
10365 | tree cv_qualifier = NULL_TREE; | |
10366 | ||
10367 | /* Peek at the next token. */ | |
10368 | token = cp_lexer_peek_token (parser->lexer); | |
10369 | /* See if it's a cv-qualifier. */ | |
10370 | switch (token->keyword) | |
10371 | { | |
10372 | case RID_CONST: | |
10373 | case RID_VOLATILE: | |
10374 | case RID_RESTRICT: | |
10375 | /* Save the value of the token. */ | |
10376 | cv_qualifier = token->value; | |
10377 | /* Consume the token. */ | |
10378 | cp_lexer_consume_token (parser->lexer); | |
10379 | break; | |
10380 | ||
10381 | default: | |
10382 | break; | |
10383 | } | |
10384 | ||
10385 | return cv_qualifier; | |
10386 | } | |
10387 | ||
10388 | /* Parse a declarator-id. | |
10389 | ||
10390 | declarator-id: | |
10391 | id-expression | |
10392 | :: [opt] nested-name-specifier [opt] type-name | |
10393 | ||
10394 | In the `id-expression' case, the value returned is as for | |
10395 | cp_parser_id_expression if the id-expression was an unqualified-id. | |
10396 | If the id-expression was a qualified-id, then a SCOPE_REF is | |
10397 | returned. The first operand is the scope (either a NAMESPACE_DECL | |
10398 | or TREE_TYPE), but the second is still just a representation of an | |
10399 | unqualified-id. */ | |
10400 | ||
10401 | static tree | |
10402 | cp_parser_declarator_id (parser) | |
10403 | cp_parser *parser; | |
10404 | { | |
10405 | tree id_expression; | |
10406 | ||
10407 | /* The expression must be an id-expression. Assume that qualified | |
10408 | names are the names of types so that: | |
10409 | ||
10410 | template <class T> | |
10411 | int S<T>::R::i = 3; | |
10412 | ||
10413 | will work; we must treat `S<T>::R' as the name of a type. | |
10414 | Similarly, assume that qualified names are templates, where | |
10415 | required, so that: | |
10416 | ||
10417 | template <class T> | |
10418 | int S<T>::R<T>::i = 3; | |
10419 | ||
10420 | will work, too. */ | |
10421 | id_expression = cp_parser_id_expression (parser, | |
10422 | /*template_keyword_p=*/false, | |
10423 | /*check_dependency_p=*/false, | |
10424 | /*template_p=*/NULL); | |
10425 | /* If the name was qualified, create a SCOPE_REF to represent | |
10426 | that. */ | |
10427 | if (parser->scope) | |
10428 | id_expression = build_nt (SCOPE_REF, parser->scope, id_expression); | |
10429 | ||
10430 | return id_expression; | |
10431 | } | |
10432 | ||
10433 | /* Parse a type-id. | |
10434 | ||
10435 | type-id: | |
10436 | type-specifier-seq abstract-declarator [opt] | |
10437 | ||
10438 | Returns the TYPE specified. */ | |
10439 | ||
10440 | static tree | |
10441 | cp_parser_type_id (parser) | |
10442 | cp_parser *parser; | |
10443 | { | |
10444 | tree type_specifier_seq; | |
10445 | tree abstract_declarator; | |
10446 | ||
10447 | /* Parse the type-specifier-seq. */ | |
10448 | type_specifier_seq | |
10449 | = cp_parser_type_specifier_seq (parser); | |
10450 | if (type_specifier_seq == error_mark_node) | |
10451 | return error_mark_node; | |
10452 | ||
10453 | /* There might or might not be an abstract declarator. */ | |
10454 | cp_parser_parse_tentatively (parser); | |
10455 | /* Look for the declarator. */ | |
10456 | abstract_declarator | |
10457 | = cp_parser_declarator (parser, /*abstract_p=*/true, NULL); | |
10458 | /* Check to see if there really was a declarator. */ | |
10459 | if (!cp_parser_parse_definitely (parser)) | |
10460 | abstract_declarator = NULL_TREE; | |
10461 | ||
10462 | return groktypename (build_tree_list (type_specifier_seq, | |
10463 | abstract_declarator)); | |
10464 | } | |
10465 | ||
10466 | /* Parse a type-specifier-seq. | |
10467 | ||
10468 | type-specifier-seq: | |
10469 | type-specifier type-specifier-seq [opt] | |
10470 | ||
10471 | GNU extension: | |
10472 | ||
10473 | type-specifier-seq: | |
10474 | attributes type-specifier-seq [opt] | |
10475 | ||
10476 | Returns a TREE_LIST. Either the TREE_VALUE of each node is a | |
10477 | type-specifier, or the TREE_PURPOSE is a list of attributes. */ | |
10478 | ||
10479 | static tree | |
10480 | cp_parser_type_specifier_seq (parser) | |
10481 | cp_parser *parser; | |
10482 | { | |
10483 | bool seen_type_specifier = false; | |
10484 | tree type_specifier_seq = NULL_TREE; | |
10485 | ||
10486 | /* Parse the type-specifiers and attributes. */ | |
10487 | while (true) | |
10488 | { | |
10489 | tree type_specifier; | |
10490 | ||
10491 | /* Check for attributes first. */ | |
10492 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_ATTRIBUTE)) | |
10493 | { | |
10494 | type_specifier_seq = tree_cons (cp_parser_attributes_opt (parser), | |
10495 | NULL_TREE, | |
10496 | type_specifier_seq); | |
10497 | continue; | |
10498 | } | |
10499 | ||
10500 | /* After the first type-specifier, others are optional. */ | |
10501 | if (seen_type_specifier) | |
10502 | cp_parser_parse_tentatively (parser); | |
10503 | /* Look for the type-specifier. */ | |
10504 | type_specifier = cp_parser_type_specifier (parser, | |
10505 | CP_PARSER_FLAGS_NONE, | |
10506 | /*is_friend=*/false, | |
10507 | /*is_declaration=*/false, | |
10508 | NULL, | |
10509 | NULL); | |
10510 | /* If the first type-specifier could not be found, this is not a | |
10511 | type-specifier-seq at all. */ | |
10512 | if (!seen_type_specifier && type_specifier == error_mark_node) | |
10513 | return error_mark_node; | |
10514 | /* If subsequent type-specifiers could not be found, the | |
10515 | type-specifier-seq is complete. */ | |
10516 | else if (seen_type_specifier && !cp_parser_parse_definitely (parser)) | |
10517 | break; | |
10518 | ||
10519 | /* Add the new type-specifier to the list. */ | |
10520 | type_specifier_seq | |
10521 | = tree_cons (NULL_TREE, type_specifier, type_specifier_seq); | |
10522 | seen_type_specifier = true; | |
10523 | } | |
10524 | ||
10525 | /* We built up the list in reverse order. */ | |
10526 | return nreverse (type_specifier_seq); | |
10527 | } | |
10528 | ||
10529 | /* Parse a parameter-declaration-clause. | |
10530 | ||
10531 | parameter-declaration-clause: | |
10532 | parameter-declaration-list [opt] ... [opt] | |
10533 | parameter-declaration-list , ... | |
10534 | ||
10535 | Returns a representation for the parameter declarations. Each node | |
10536 | is a TREE_LIST. (See cp_parser_parameter_declaration for the exact | |
10537 | representation.) If the parameter-declaration-clause ends with an | |
10538 | ellipsis, PARMLIST_ELLIPSIS_P will hold of the first node in the | |
10539 | list. A return value of NULL_TREE indicates a | |
10540 | parameter-declaration-clause consisting only of an ellipsis. */ | |
10541 | ||
10542 | static tree | |
10543 | cp_parser_parameter_declaration_clause (parser) | |
10544 | cp_parser *parser; | |
10545 | { | |
10546 | tree parameters; | |
10547 | cp_token *token; | |
10548 | bool ellipsis_p; | |
10549 | ||
10550 | /* Peek at the next token. */ | |
10551 | token = cp_lexer_peek_token (parser->lexer); | |
10552 | /* Check for trivial parameter-declaration-clauses. */ | |
10553 | if (token->type == CPP_ELLIPSIS) | |
10554 | { | |
10555 | /* Consume the `...' token. */ | |
10556 | cp_lexer_consume_token (parser->lexer); | |
10557 | return NULL_TREE; | |
10558 | } | |
10559 | else if (token->type == CPP_CLOSE_PAREN) | |
10560 | /* There are no parameters. */ | |
c73aecdf DE |
10561 | { |
10562 | #ifndef NO_IMPLICIT_EXTERN_C | |
10563 | if (in_system_header && current_class_type == NULL | |
10564 | && current_lang_name == lang_name_c) | |
10565 | return NULL_TREE; | |
10566 | else | |
10567 | #endif | |
10568 | return void_list_node; | |
10569 | } | |
a723baf1 MM |
10570 | /* Check for `(void)', too, which is a special case. */ |
10571 | else if (token->keyword == RID_VOID | |
10572 | && (cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
10573 | == CPP_CLOSE_PAREN)) | |
10574 | { | |
10575 | /* Consume the `void' token. */ | |
10576 | cp_lexer_consume_token (parser->lexer); | |
10577 | /* There are no parameters. */ | |
10578 | return void_list_node; | |
10579 | } | |
10580 | ||
10581 | /* Parse the parameter-declaration-list. */ | |
10582 | parameters = cp_parser_parameter_declaration_list (parser); | |
10583 | /* If a parse error occurred while parsing the | |
10584 | parameter-declaration-list, then the entire | |
10585 | parameter-declaration-clause is erroneous. */ | |
10586 | if (parameters == error_mark_node) | |
10587 | return error_mark_node; | |
10588 | ||
10589 | /* Peek at the next token. */ | |
10590 | token = cp_lexer_peek_token (parser->lexer); | |
10591 | /* If it's a `,', the clause should terminate with an ellipsis. */ | |
10592 | if (token->type == CPP_COMMA) | |
10593 | { | |
10594 | /* Consume the `,'. */ | |
10595 | cp_lexer_consume_token (parser->lexer); | |
10596 | /* Expect an ellipsis. */ | |
10597 | ellipsis_p | |
10598 | = (cp_parser_require (parser, CPP_ELLIPSIS, "`...'") != NULL); | |
10599 | } | |
10600 | /* It might also be `...' if the optional trailing `,' was | |
10601 | omitted. */ | |
10602 | else if (token->type == CPP_ELLIPSIS) | |
10603 | { | |
10604 | /* Consume the `...' token. */ | |
10605 | cp_lexer_consume_token (parser->lexer); | |
10606 | /* And remember that we saw it. */ | |
10607 | ellipsis_p = true; | |
10608 | } | |
10609 | else | |
10610 | ellipsis_p = false; | |
10611 | ||
10612 | /* Finish the parameter list. */ | |
10613 | return finish_parmlist (parameters, ellipsis_p); | |
10614 | } | |
10615 | ||
10616 | /* Parse a parameter-declaration-list. | |
10617 | ||
10618 | parameter-declaration-list: | |
10619 | parameter-declaration | |
10620 | parameter-declaration-list , parameter-declaration | |
10621 | ||
10622 | Returns a representation of the parameter-declaration-list, as for | |
10623 | cp_parser_parameter_declaration_clause. However, the | |
10624 | `void_list_node' is never appended to the list. */ | |
10625 | ||
10626 | static tree | |
10627 | cp_parser_parameter_declaration_list (parser) | |
10628 | cp_parser *parser; | |
10629 | { | |
10630 | tree parameters = NULL_TREE; | |
10631 | ||
10632 | /* Look for more parameters. */ | |
10633 | while (true) | |
10634 | { | |
10635 | tree parameter; | |
10636 | /* Parse the parameter. */ | |
10637 | parameter | |
10638 | = cp_parser_parameter_declaration (parser, | |
10639 | /*greater_than_is_operator_p=*/true); | |
10640 | /* If a parse error ocurred parsing the parameter declaration, | |
10641 | then the entire parameter-declaration-list is erroneous. */ | |
10642 | if (parameter == error_mark_node) | |
10643 | { | |
10644 | parameters = error_mark_node; | |
10645 | break; | |
10646 | } | |
10647 | /* Add the new parameter to the list. */ | |
10648 | TREE_CHAIN (parameter) = parameters; | |
10649 | parameters = parameter; | |
10650 | ||
10651 | /* Peek at the next token. */ | |
10652 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_PAREN) | |
10653 | || cp_lexer_next_token_is (parser->lexer, CPP_ELLIPSIS)) | |
10654 | /* The parameter-declaration-list is complete. */ | |
10655 | break; | |
10656 | else if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
10657 | { | |
10658 | cp_token *token; | |
10659 | ||
10660 | /* Peek at the next token. */ | |
10661 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
10662 | /* If it's an ellipsis, then the list is complete. */ | |
10663 | if (token->type == CPP_ELLIPSIS) | |
10664 | break; | |
10665 | /* Otherwise, there must be more parameters. Consume the | |
10666 | `,'. */ | |
10667 | cp_lexer_consume_token (parser->lexer); | |
10668 | } | |
10669 | else | |
10670 | { | |
10671 | cp_parser_error (parser, "expected `,' or `...'"); | |
10672 | break; | |
10673 | } | |
10674 | } | |
10675 | ||
10676 | /* We built up the list in reverse order; straighten it out now. */ | |
10677 | return nreverse (parameters); | |
10678 | } | |
10679 | ||
10680 | /* Parse a parameter declaration. | |
10681 | ||
10682 | parameter-declaration: | |
10683 | decl-specifier-seq declarator | |
10684 | decl-specifier-seq declarator = assignment-expression | |
10685 | decl-specifier-seq abstract-declarator [opt] | |
10686 | decl-specifier-seq abstract-declarator [opt] = assignment-expression | |
10687 | ||
10688 | If GREATER_THAN_IS_OPERATOR_P is FALSE, then a non-nested `>' token | |
10689 | encountered during the parsing of the assignment-expression is not | |
10690 | interpreted as a greater-than operator. | |
10691 | ||
10692 | Returns a TREE_LIST representing the parameter-declaration. The | |
10693 | TREE_VALUE is a representation of the decl-specifier-seq and | |
10694 | declarator. In particular, the TREE_VALUE will be a TREE_LIST | |
10695 | whose TREE_PURPOSE represents the decl-specifier-seq and whose | |
10696 | TREE_VALUE represents the declarator. */ | |
10697 | ||
10698 | static tree | |
10699 | cp_parser_parameter_declaration (parser, greater_than_is_operator_p) | |
10700 | cp_parser *parser; | |
10701 | bool greater_than_is_operator_p; | |
10702 | { | |
10703 | bool declares_class_or_enum; | |
10704 | tree decl_specifiers; | |
10705 | tree attributes; | |
10706 | tree declarator; | |
10707 | tree default_argument; | |
10708 | tree parameter; | |
10709 | cp_token *token; | |
10710 | const char *saved_message; | |
10711 | ||
10712 | /* Type definitions may not appear in parameter types. */ | |
10713 | saved_message = parser->type_definition_forbidden_message; | |
10714 | parser->type_definition_forbidden_message | |
10715 | = "types may not be defined in parameter types"; | |
10716 | ||
10717 | /* Parse the declaration-specifiers. */ | |
10718 | decl_specifiers | |
10719 | = cp_parser_decl_specifier_seq (parser, | |
10720 | CP_PARSER_FLAGS_NONE, | |
10721 | &attributes, | |
10722 | &declares_class_or_enum); | |
10723 | /* If an error occurred, there's no reason to attempt to parse the | |
10724 | rest of the declaration. */ | |
10725 | if (cp_parser_error_occurred (parser)) | |
10726 | { | |
10727 | parser->type_definition_forbidden_message = saved_message; | |
10728 | return error_mark_node; | |
10729 | } | |
10730 | ||
10731 | /* Peek at the next token. */ | |
10732 | token = cp_lexer_peek_token (parser->lexer); | |
10733 | /* If the next token is a `)', `,', `=', `>', or `...', then there | |
10734 | is no declarator. */ | |
10735 | if (token->type == CPP_CLOSE_PAREN | |
10736 | || token->type == CPP_COMMA | |
10737 | || token->type == CPP_EQ | |
10738 | || token->type == CPP_ELLIPSIS | |
10739 | || token->type == CPP_GREATER) | |
10740 | declarator = NULL_TREE; | |
10741 | /* Otherwise, there should be a declarator. */ | |
10742 | else | |
10743 | { | |
10744 | bool saved_default_arg_ok_p = parser->default_arg_ok_p; | |
10745 | parser->default_arg_ok_p = false; | |
10746 | ||
10747 | /* We don't know whether the declarator will be abstract or | |
10748 | not. So, first we try an ordinary declarator. */ | |
10749 | cp_parser_parse_tentatively (parser); | |
10750 | declarator = cp_parser_declarator (parser, | |
10751 | /*abstract_p=*/false, | |
10752 | /*ctor_dtor_or_conv_p=*/NULL); | |
10753 | /* If that didn't work, look for an abstract declarator. */ | |
10754 | if (!cp_parser_parse_definitely (parser)) | |
10755 | declarator = cp_parser_declarator (parser, | |
10756 | /*abstract_p=*/true, | |
10757 | /*ctor_dtor_or_conv_p=*/NULL); | |
10758 | parser->default_arg_ok_p = saved_default_arg_ok_p; | |
10759 | } | |
10760 | ||
10761 | /* The restriction on definining new types applies only to the type | |
10762 | of the parameter, not to the default argument. */ | |
10763 | parser->type_definition_forbidden_message = saved_message; | |
10764 | ||
10765 | /* If the next token is `=', then process a default argument. */ | |
10766 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
10767 | { | |
10768 | bool saved_greater_than_is_operator_p; | |
10769 | /* Consume the `='. */ | |
10770 | cp_lexer_consume_token (parser->lexer); | |
10771 | ||
10772 | /* If we are defining a class, then the tokens that make up the | |
10773 | default argument must be saved and processed later. */ | |
10774 | if (at_class_scope_p () && TYPE_BEING_DEFINED (current_class_type)) | |
10775 | { | |
10776 | unsigned depth = 0; | |
10777 | ||
10778 | /* Create a DEFAULT_ARG to represented the unparsed default | |
10779 | argument. */ | |
10780 | default_argument = make_node (DEFAULT_ARG); | |
10781 | DEFARG_TOKENS (default_argument) = cp_token_cache_new (); | |
10782 | ||
10783 | /* Add tokens until we have processed the entire default | |
10784 | argument. */ | |
10785 | while (true) | |
10786 | { | |
10787 | bool done = false; | |
10788 | cp_token *token; | |
10789 | ||
10790 | /* Peek at the next token. */ | |
10791 | token = cp_lexer_peek_token (parser->lexer); | |
10792 | /* What we do depends on what token we have. */ | |
10793 | switch (token->type) | |
10794 | { | |
10795 | /* In valid code, a default argument must be | |
10796 | immediately followed by a `,' `)', or `...'. */ | |
10797 | case CPP_COMMA: | |
10798 | case CPP_CLOSE_PAREN: | |
10799 | case CPP_ELLIPSIS: | |
10800 | /* If we run into a non-nested `;', `}', or `]', | |
10801 | then the code is invalid -- but the default | |
10802 | argument is certainly over. */ | |
10803 | case CPP_SEMICOLON: | |
10804 | case CPP_CLOSE_BRACE: | |
10805 | case CPP_CLOSE_SQUARE: | |
10806 | if (depth == 0) | |
10807 | done = true; | |
10808 | /* Update DEPTH, if necessary. */ | |
10809 | else if (token->type == CPP_CLOSE_PAREN | |
10810 | || token->type == CPP_CLOSE_BRACE | |
10811 | || token->type == CPP_CLOSE_SQUARE) | |
10812 | --depth; | |
10813 | break; | |
10814 | ||
10815 | case CPP_OPEN_PAREN: | |
10816 | case CPP_OPEN_SQUARE: | |
10817 | case CPP_OPEN_BRACE: | |
10818 | ++depth; | |
10819 | break; | |
10820 | ||
10821 | case CPP_GREATER: | |
10822 | /* If we see a non-nested `>', and `>' is not an | |
10823 | operator, then it marks the end of the default | |
10824 | argument. */ | |
10825 | if (!depth && !greater_than_is_operator_p) | |
10826 | done = true; | |
10827 | break; | |
10828 | ||
10829 | /* If we run out of tokens, issue an error message. */ | |
10830 | case CPP_EOF: | |
10831 | error ("file ends in default argument"); | |
10832 | done = true; | |
10833 | break; | |
10834 | ||
10835 | case CPP_NAME: | |
10836 | case CPP_SCOPE: | |
10837 | /* In these cases, we should look for template-ids. | |
10838 | For example, if the default argument is | |
10839 | `X<int, double>()', we need to do name lookup to | |
10840 | figure out whether or not `X' is a template; if | |
10841 | so, the `,' does not end the deault argument. | |
10842 | ||
10843 | That is not yet done. */ | |
10844 | break; | |
10845 | ||
10846 | default: | |
10847 | break; | |
10848 | } | |
10849 | ||
10850 | /* If we've reached the end, stop. */ | |
10851 | if (done) | |
10852 | break; | |
10853 | ||
10854 | /* Add the token to the token block. */ | |
10855 | token = cp_lexer_consume_token (parser->lexer); | |
10856 | cp_token_cache_push_token (DEFARG_TOKENS (default_argument), | |
10857 | token); | |
10858 | } | |
10859 | } | |
10860 | /* Outside of a class definition, we can just parse the | |
10861 | assignment-expression. */ | |
10862 | else | |
10863 | { | |
10864 | bool saved_local_variables_forbidden_p; | |
10865 | ||
10866 | /* Make sure that PARSER->GREATER_THAN_IS_OPERATOR_P is | |
10867 | set correctly. */ | |
10868 | saved_greater_than_is_operator_p | |
10869 | = parser->greater_than_is_operator_p; | |
10870 | parser->greater_than_is_operator_p = greater_than_is_operator_p; | |
10871 | /* Local variable names (and the `this' keyword) may not | |
10872 | appear in a default argument. */ | |
10873 | saved_local_variables_forbidden_p | |
10874 | = parser->local_variables_forbidden_p; | |
10875 | parser->local_variables_forbidden_p = true; | |
10876 | /* Parse the assignment-expression. */ | |
10877 | default_argument = cp_parser_assignment_expression (parser); | |
10878 | /* Restore saved state. */ | |
10879 | parser->greater_than_is_operator_p | |
10880 | = saved_greater_than_is_operator_p; | |
10881 | parser->local_variables_forbidden_p | |
10882 | = saved_local_variables_forbidden_p; | |
10883 | } | |
10884 | if (!parser->default_arg_ok_p) | |
10885 | { | |
10886 | pedwarn ("default arguments are only permitted on functions"); | |
10887 | if (flag_pedantic_errors) | |
10888 | default_argument = NULL_TREE; | |
10889 | } | |
10890 | } | |
10891 | else | |
10892 | default_argument = NULL_TREE; | |
10893 | ||
10894 | /* Create the representation of the parameter. */ | |
10895 | if (attributes) | |
10896 | decl_specifiers = tree_cons (attributes, NULL_TREE, decl_specifiers); | |
10897 | parameter = build_tree_list (default_argument, | |
10898 | build_tree_list (decl_specifiers, | |
10899 | declarator)); | |
10900 | ||
10901 | return parameter; | |
10902 | } | |
10903 | ||
10904 | /* Parse a function-definition. | |
10905 | ||
10906 | function-definition: | |
10907 | decl-specifier-seq [opt] declarator ctor-initializer [opt] | |
10908 | function-body | |
10909 | decl-specifier-seq [opt] declarator function-try-block | |
10910 | ||
10911 | GNU Extension: | |
10912 | ||
10913 | function-definition: | |
10914 | __extension__ function-definition | |
10915 | ||
10916 | Returns the FUNCTION_DECL for the function. If FRIEND_P is | |
10917 | non-NULL, *FRIEND_P is set to TRUE iff the function was declared to | |
10918 | be a `friend'. */ | |
10919 | ||
10920 | static tree | |
10921 | cp_parser_function_definition (parser, friend_p) | |
10922 | cp_parser *parser; | |
10923 | bool *friend_p; | |
10924 | { | |
10925 | tree decl_specifiers; | |
10926 | tree attributes; | |
10927 | tree declarator; | |
10928 | tree fn; | |
10929 | tree access_checks; | |
10930 | cp_token *token; | |
10931 | bool declares_class_or_enum; | |
10932 | bool member_p; | |
10933 | /* The saved value of the PEDANTIC flag. */ | |
10934 | int saved_pedantic; | |
10935 | ||
10936 | /* Any pending qualification must be cleared by our caller. It is | |
10937 | more robust to force the callers to clear PARSER->SCOPE than to | |
10938 | do it here since if the qualification is in effect here, it might | |
10939 | also end up in effect elsewhere that it is not intended. */ | |
10940 | my_friendly_assert (!parser->scope, 20010821); | |
10941 | ||
10942 | /* Handle `__extension__'. */ | |
10943 | if (cp_parser_extension_opt (parser, &saved_pedantic)) | |
10944 | { | |
10945 | /* Parse the function-definition. */ | |
10946 | fn = cp_parser_function_definition (parser, friend_p); | |
10947 | /* Restore the PEDANTIC flag. */ | |
10948 | pedantic = saved_pedantic; | |
10949 | ||
10950 | return fn; | |
10951 | } | |
10952 | ||
10953 | /* Check to see if this definition appears in a class-specifier. */ | |
10954 | member_p = (at_class_scope_p () | |
10955 | && TYPE_BEING_DEFINED (current_class_type)); | |
10956 | /* Defer access checks in the decl-specifier-seq until we know what | |
10957 | function is being defined. There is no need to do this for the | |
10958 | definition of member functions; we cannot be defining a member | |
10959 | from another class. */ | |
10960 | if (!member_p) | |
10961 | cp_parser_start_deferring_access_checks (parser); | |
10962 | /* Parse the decl-specifier-seq. */ | |
10963 | decl_specifiers | |
10964 | = cp_parser_decl_specifier_seq (parser, | |
10965 | CP_PARSER_FLAGS_OPTIONAL, | |
10966 | &attributes, | |
10967 | &declares_class_or_enum); | |
10968 | /* Figure out whether this declaration is a `friend'. */ | |
10969 | if (friend_p) | |
10970 | *friend_p = cp_parser_friend_p (decl_specifiers); | |
10971 | ||
10972 | /* Parse the declarator. */ | |
10973 | declarator = cp_parser_declarator (parser, | |
10974 | /*abstract_p=*/false, | |
10975 | /*ctor_dtor_or_conv_p=*/NULL); | |
10976 | ||
10977 | /* Gather up any access checks that occurred. */ | |
10978 | if (!member_p) | |
10979 | access_checks = cp_parser_stop_deferring_access_checks (parser); | |
10980 | else | |
10981 | access_checks = NULL_TREE; | |
10982 | ||
10983 | /* If something has already gone wrong, we may as well stop now. */ | |
10984 | if (declarator == error_mark_node) | |
10985 | { | |
10986 | /* Skip to the end of the function, or if this wasn't anything | |
10987 | like a function-definition, to a `;' in the hopes of finding | |
10988 | a sensible place from which to continue parsing. */ | |
10989 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
10990 | return error_mark_node; | |
10991 | } | |
10992 | ||
10993 | /* The next character should be a `{' (for a simple function | |
10994 | definition), a `:' (for a ctor-initializer), or `try' (for a | |
10995 | function-try block). */ | |
10996 | token = cp_lexer_peek_token (parser->lexer); | |
10997 | if (!cp_parser_token_starts_function_definition_p (token)) | |
10998 | { | |
10999 | /* Issue the error-message. */ | |
11000 | cp_parser_error (parser, "expected function-definition"); | |
11001 | /* Skip to the next `;'. */ | |
11002 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
11003 | ||
11004 | return error_mark_node; | |
11005 | } | |
11006 | ||
11007 | /* If we are in a class scope, then we must handle | |
11008 | function-definitions specially. In particular, we save away the | |
11009 | tokens that make up the function body, and parse them again | |
11010 | later, in order to handle code like: | |
11011 | ||
11012 | struct S { | |
11013 | int f () { return i; } | |
11014 | int i; | |
11015 | }; | |
11016 | ||
11017 | Here, we cannot parse the body of `f' until after we have seen | |
11018 | the declaration of `i'. */ | |
11019 | if (member_p) | |
11020 | { | |
11021 | cp_token_cache *cache; | |
11022 | ||
11023 | /* Create the function-declaration. */ | |
11024 | fn = start_method (decl_specifiers, declarator, attributes); | |
11025 | /* If something went badly wrong, bail out now. */ | |
11026 | if (fn == error_mark_node) | |
11027 | { | |
11028 | /* If there's a function-body, skip it. */ | |
11029 | if (cp_parser_token_starts_function_definition_p | |
11030 | (cp_lexer_peek_token (parser->lexer))) | |
11031 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
11032 | return error_mark_node; | |
11033 | } | |
11034 | ||
11035 | /* Create a token cache. */ | |
11036 | cache = cp_token_cache_new (); | |
11037 | /* Save away the tokens that make up the body of the | |
11038 | function. */ | |
11039 | cp_parser_cache_group (parser, cache, CPP_CLOSE_BRACE, /*depth=*/0); | |
11040 | /* Handle function try blocks. */ | |
11041 | while (cp_lexer_next_token_is_keyword (parser->lexer, RID_CATCH)) | |
11042 | cp_parser_cache_group (parser, cache, CPP_CLOSE_BRACE, /*depth=*/0); | |
11043 | ||
11044 | /* Save away the inline definition; we will process it when the | |
11045 | class is complete. */ | |
11046 | DECL_PENDING_INLINE_INFO (fn) = cache; | |
11047 | DECL_PENDING_INLINE_P (fn) = 1; | |
11048 | ||
11049 | /* We're done with the inline definition. */ | |
11050 | finish_method (fn); | |
11051 | ||
11052 | /* Add FN to the queue of functions to be parsed later. */ | |
11053 | TREE_VALUE (parser->unparsed_functions_queues) | |
11054 | = tree_cons (current_class_type, fn, | |
11055 | TREE_VALUE (parser->unparsed_functions_queues)); | |
11056 | ||
11057 | return fn; | |
11058 | } | |
11059 | ||
11060 | /* Check that the number of template-parameter-lists is OK. */ | |
11061 | if (!cp_parser_check_declarator_template_parameters (parser, | |
11062 | declarator)) | |
11063 | { | |
11064 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
11065 | return error_mark_node; | |
11066 | } | |
11067 | ||
11068 | return (cp_parser_function_definition_from_specifiers_and_declarator | |
11069 | (parser, decl_specifiers, attributes, declarator, access_checks)); | |
11070 | } | |
11071 | ||
11072 | /* Parse a function-body. | |
11073 | ||
11074 | function-body: | |
11075 | compound_statement */ | |
11076 | ||
11077 | static void | |
11078 | cp_parser_function_body (cp_parser *parser) | |
11079 | { | |
11080 | cp_parser_compound_statement (parser); | |
11081 | } | |
11082 | ||
11083 | /* Parse a ctor-initializer-opt followed by a function-body. Return | |
11084 | true if a ctor-initializer was present. */ | |
11085 | ||
11086 | static bool | |
11087 | cp_parser_ctor_initializer_opt_and_function_body (cp_parser *parser) | |
11088 | { | |
11089 | tree body; | |
11090 | bool ctor_initializer_p; | |
11091 | ||
11092 | /* Begin the function body. */ | |
11093 | body = begin_function_body (); | |
11094 | /* Parse the optional ctor-initializer. */ | |
11095 | ctor_initializer_p = cp_parser_ctor_initializer_opt (parser); | |
11096 | /* Parse the function-body. */ | |
11097 | cp_parser_function_body (parser); | |
11098 | /* Finish the function body. */ | |
11099 | finish_function_body (body); | |
11100 | ||
11101 | return ctor_initializer_p; | |
11102 | } | |
11103 | ||
11104 | /* Parse an initializer. | |
11105 | ||
11106 | initializer: | |
11107 | = initializer-clause | |
11108 | ( expression-list ) | |
11109 | ||
11110 | Returns a expression representing the initializer. If no | |
11111 | initializer is present, NULL_TREE is returned. | |
11112 | ||
11113 | *IS_PARENTHESIZED_INIT is set to TRUE if the `( expression-list )' | |
11114 | production is used, and zero otherwise. *IS_PARENTHESIZED_INIT is | |
11115 | set to FALSE if there is no initializer present. */ | |
11116 | ||
11117 | static tree | |
11118 | cp_parser_initializer (parser, is_parenthesized_init) | |
11119 | cp_parser *parser; | |
11120 | bool *is_parenthesized_init; | |
11121 | { | |
11122 | cp_token *token; | |
11123 | tree init; | |
11124 | ||
11125 | /* Peek at the next token. */ | |
11126 | token = cp_lexer_peek_token (parser->lexer); | |
11127 | ||
11128 | /* Let our caller know whether or not this initializer was | |
11129 | parenthesized. */ | |
11130 | *is_parenthesized_init = (token->type == CPP_OPEN_PAREN); | |
11131 | ||
11132 | if (token->type == CPP_EQ) | |
11133 | { | |
11134 | /* Consume the `='. */ | |
11135 | cp_lexer_consume_token (parser->lexer); | |
11136 | /* Parse the initializer-clause. */ | |
11137 | init = cp_parser_initializer_clause (parser); | |
11138 | } | |
11139 | else if (token->type == CPP_OPEN_PAREN) | |
11140 | { | |
11141 | /* Consume the `('. */ | |
11142 | cp_lexer_consume_token (parser->lexer); | |
11143 | /* Parse the expression-list. */ | |
11144 | init = cp_parser_expression_list (parser); | |
11145 | /* Consume the `)' token. */ | |
11146 | if (!cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'")) | |
11147 | cp_parser_skip_to_closing_parenthesis (parser); | |
11148 | } | |
11149 | else | |
11150 | { | |
11151 | /* Anything else is an error. */ | |
11152 | cp_parser_error (parser, "expected initializer"); | |
11153 | init = error_mark_node; | |
11154 | } | |
11155 | ||
11156 | return init; | |
11157 | } | |
11158 | ||
11159 | /* Parse an initializer-clause. | |
11160 | ||
11161 | initializer-clause: | |
11162 | assignment-expression | |
11163 | { initializer-list , [opt] } | |
11164 | { } | |
11165 | ||
11166 | Returns an expression representing the initializer. | |
11167 | ||
11168 | If the `assignment-expression' production is used the value | |
11169 | returned is simply a reprsentation for the expression. | |
11170 | ||
11171 | Otherwise, a CONSTRUCTOR is returned. The CONSTRUCTOR_ELTS will be | |
11172 | the elements of the initializer-list (or NULL_TREE, if the last | |
11173 | production is used). The TREE_TYPE for the CONSTRUCTOR will be | |
11174 | NULL_TREE. There is no way to detect whether or not the optional | |
11175 | trailing `,' was provided. */ | |
11176 | ||
11177 | static tree | |
11178 | cp_parser_initializer_clause (parser) | |
11179 | cp_parser *parser; | |
11180 | { | |
11181 | tree initializer; | |
11182 | ||
11183 | /* If it is not a `{', then we are looking at an | |
11184 | assignment-expression. */ | |
11185 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_BRACE)) | |
11186 | initializer = cp_parser_assignment_expression (parser); | |
11187 | else | |
11188 | { | |
11189 | /* Consume the `{' token. */ | |
11190 | cp_lexer_consume_token (parser->lexer); | |
11191 | /* Create a CONSTRUCTOR to represent the braced-initializer. */ | |
11192 | initializer = make_node (CONSTRUCTOR); | |
11193 | /* Mark it with TREE_HAS_CONSTRUCTOR. This should not be | |
11194 | necessary, but check_initializer depends upon it, for | |
11195 | now. */ | |
11196 | TREE_HAS_CONSTRUCTOR (initializer) = 1; | |
11197 | /* If it's not a `}', then there is a non-trivial initializer. */ | |
11198 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_BRACE)) | |
11199 | { | |
11200 | /* Parse the initializer list. */ | |
11201 | CONSTRUCTOR_ELTS (initializer) | |
11202 | = cp_parser_initializer_list (parser); | |
11203 | /* A trailing `,' token is allowed. */ | |
11204 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
11205 | cp_lexer_consume_token (parser->lexer); | |
11206 | } | |
11207 | ||
11208 | /* Now, there should be a trailing `}'. */ | |
11209 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
11210 | } | |
11211 | ||
11212 | return initializer; | |
11213 | } | |
11214 | ||
11215 | /* Parse an initializer-list. | |
11216 | ||
11217 | initializer-list: | |
11218 | initializer-clause | |
11219 | initializer-list , initializer-clause | |
11220 | ||
11221 | GNU Extension: | |
11222 | ||
11223 | initializer-list: | |
11224 | identifier : initializer-clause | |
11225 | initializer-list, identifier : initializer-clause | |
11226 | ||
11227 | Returns a TREE_LIST. The TREE_VALUE of each node is an expression | |
11228 | for the initializer. If the TREE_PURPOSE is non-NULL, it is the | |
11229 | IDENTIFIER_NODE naming the field to initialize. */ | |
11230 | ||
11231 | static tree | |
11232 | cp_parser_initializer_list (parser) | |
11233 | cp_parser *parser; | |
11234 | { | |
11235 | tree initializers = NULL_TREE; | |
11236 | ||
11237 | /* Parse the rest of the list. */ | |
11238 | while (true) | |
11239 | { | |
11240 | cp_token *token; | |
11241 | tree identifier; | |
11242 | tree initializer; | |
11243 | ||
11244 | /* If the next token is an identifier and the following one is a | |
11245 | colon, we are looking at the GNU designated-initializer | |
11246 | syntax. */ | |
11247 | if (cp_parser_allow_gnu_extensions_p (parser) | |
11248 | && cp_lexer_next_token_is (parser->lexer, CPP_NAME) | |
11249 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type == CPP_COLON) | |
11250 | { | |
11251 | /* Consume the identifier. */ | |
11252 | identifier = cp_lexer_consume_token (parser->lexer)->value; | |
11253 | /* Consume the `:'. */ | |
11254 | cp_lexer_consume_token (parser->lexer); | |
11255 | } | |
11256 | else | |
11257 | identifier = NULL_TREE; | |
11258 | ||
11259 | /* Parse the initializer. */ | |
11260 | initializer = cp_parser_initializer_clause (parser); | |
11261 | ||
11262 | /* Add it to the list. */ | |
11263 | initializers = tree_cons (identifier, initializer, initializers); | |
11264 | ||
11265 | /* If the next token is not a comma, we have reached the end of | |
11266 | the list. */ | |
11267 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
11268 | break; | |
11269 | ||
11270 | /* Peek at the next token. */ | |
11271 | token = cp_lexer_peek_nth_token (parser->lexer, 2); | |
11272 | /* If the next token is a `}', then we're still done. An | |
11273 | initializer-clause can have a trailing `,' after the | |
11274 | initializer-list and before the closing `}'. */ | |
11275 | if (token->type == CPP_CLOSE_BRACE) | |
11276 | break; | |
11277 | ||
11278 | /* Consume the `,' token. */ | |
11279 | cp_lexer_consume_token (parser->lexer); | |
11280 | } | |
11281 | ||
11282 | /* The initializers were built up in reverse order, so we need to | |
11283 | reverse them now. */ | |
11284 | return nreverse (initializers); | |
11285 | } | |
11286 | ||
11287 | /* Classes [gram.class] */ | |
11288 | ||
11289 | /* Parse a class-name. | |
11290 | ||
11291 | class-name: | |
11292 | identifier | |
11293 | template-id | |
11294 | ||
11295 | TYPENAME_KEYWORD_P is true iff the `typename' keyword has been used | |
11296 | to indicate that names looked up in dependent types should be | |
11297 | assumed to be types. TEMPLATE_KEYWORD_P is true iff the `template' | |
11298 | keyword has been used to indicate that the name that appears next | |
11299 | is a template. TYPE_P is true iff the next name should be treated | |
11300 | as class-name, even if it is declared to be some other kind of name | |
11301 | as well. The accessibility of the class-name is checked iff | |
11302 | CHECK_ACCESS_P is true. If CHECK_DEPENDENCY_P is FALSE, names are | |
11303 | looked up in dependent scopes. If CLASS_HEAD_P is TRUE, this class | |
11304 | is the class being defined in a class-head. | |
11305 | ||
11306 | Returns the TYPE_DECL representing the class. */ | |
11307 | ||
11308 | static tree | |
11309 | cp_parser_class_name (cp_parser *parser, | |
11310 | bool typename_keyword_p, | |
11311 | bool template_keyword_p, | |
11312 | bool type_p, | |
11313 | bool check_access_p, | |
11314 | bool check_dependency_p, | |
11315 | bool class_head_p) | |
11316 | { | |
11317 | tree decl; | |
11318 | tree scope; | |
11319 | bool typename_p; | |
11320 | ||
11321 | /* PARSER->SCOPE can be cleared when parsing the template-arguments | |
11322 | to a template-id, so we save it here. */ | |
11323 | scope = parser->scope; | |
11324 | /* Any name names a type if we're following the `typename' keyword | |
11325 | in a qualified name where the enclosing scope is type-dependent. */ | |
11326 | typename_p = (typename_keyword_p && scope && TYPE_P (scope) | |
11327 | && cp_parser_dependent_type_p (scope)); | |
11328 | ||
11329 | /* We don't know whether what comes next is a template-id or | |
11330 | not. */ | |
11331 | cp_parser_parse_tentatively (parser); | |
11332 | /* Try a template-id. */ | |
11333 | decl = cp_parser_template_id (parser, template_keyword_p, | |
11334 | check_dependency_p); | |
11335 | if (cp_parser_parse_definitely (parser)) | |
11336 | { | |
11337 | if (decl == error_mark_node) | |
11338 | return error_mark_node; | |
11339 | } | |
11340 | else | |
11341 | { | |
11342 | /* If it wasn't a template-id, try a simple identifier. */ | |
11343 | tree identifier; | |
11344 | ||
11345 | /* Look for the identifier. */ | |
11346 | identifier = cp_parser_identifier (parser); | |
11347 | /* If the next token isn't an identifier, we are certainly not | |
11348 | looking at a class-name. */ | |
11349 | if (identifier == error_mark_node) | |
11350 | decl = error_mark_node; | |
11351 | /* If we know this is a type-name, there's no need to look it | |
11352 | up. */ | |
11353 | else if (typename_p) | |
11354 | decl = identifier; | |
11355 | else | |
11356 | { | |
11357 | /* If the next token is a `::', then the name must be a type | |
11358 | name. | |
11359 | ||
11360 | [basic.lookup.qual] | |
11361 | ||
11362 | During the lookup for a name preceding the :: scope | |
11363 | resolution operator, object, function, and enumerator | |
11364 | names are ignored. */ | |
11365 | if (cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
11366 | type_p = true; | |
11367 | /* Look up the name. */ | |
11368 | decl = cp_parser_lookup_name (parser, identifier, | |
11369 | check_access_p, | |
11370 | type_p, | |
11371 | check_dependency_p); | |
11372 | } | |
11373 | } | |
11374 | ||
11375 | decl = cp_parser_maybe_treat_template_as_class (decl, class_head_p); | |
11376 | ||
11377 | /* If this is a typename, create a TYPENAME_TYPE. */ | |
11378 | if (typename_p && decl != error_mark_node) | |
11379 | decl = TYPE_NAME (make_typename_type (scope, decl, | |
11380 | /*complain=*/1)); | |
11381 | ||
11382 | /* Check to see that it is really the name of a class. */ | |
11383 | if (TREE_CODE (decl) == TEMPLATE_ID_EXPR | |
11384 | && TREE_CODE (TREE_OPERAND (decl, 0)) == IDENTIFIER_NODE | |
11385 | && cp_lexer_next_token_is (parser->lexer, CPP_SCOPE)) | |
11386 | /* Situations like this: | |
11387 | ||
11388 | template <typename T> struct A { | |
11389 | typename T::template X<int>::I i; | |
11390 | }; | |
11391 | ||
11392 | are problematic. Is `T::template X<int>' a class-name? The | |
11393 | standard does not seem to be definitive, but there is no other | |
11394 | valid interpretation of the following `::'. Therefore, those | |
11395 | names are considered class-names. */ | |
11396 | decl = TYPE_NAME (make_typename_type (scope, decl, | |
11397 | tf_error | tf_parsing)); | |
11398 | else if (decl == error_mark_node | |
11399 | || TREE_CODE (decl) != TYPE_DECL | |
11400 | || !IS_AGGR_TYPE (TREE_TYPE (decl))) | |
11401 | { | |
11402 | cp_parser_error (parser, "expected class-name"); | |
11403 | return error_mark_node; | |
11404 | } | |
11405 | ||
11406 | return decl; | |
11407 | } | |
11408 | ||
11409 | /* Parse a class-specifier. | |
11410 | ||
11411 | class-specifier: | |
11412 | class-head { member-specification [opt] } | |
11413 | ||
11414 | Returns the TREE_TYPE representing the class. */ | |
11415 | ||
11416 | static tree | |
11417 | cp_parser_class_specifier (parser) | |
11418 | cp_parser *parser; | |
11419 | { | |
11420 | cp_token *token; | |
11421 | tree type; | |
11422 | tree attributes = NULL_TREE; | |
11423 | int has_trailing_semicolon; | |
11424 | bool nested_name_specifier_p; | |
11425 | bool deferring_access_checks_p; | |
11426 | tree saved_access_checks; | |
11427 | unsigned saved_num_template_parameter_lists; | |
11428 | ||
11429 | /* Parse the class-head. */ | |
11430 | type = cp_parser_class_head (parser, | |
11431 | &nested_name_specifier_p, | |
11432 | &deferring_access_checks_p, | |
11433 | &saved_access_checks); | |
11434 | /* If the class-head was a semantic disaster, skip the entire body | |
11435 | of the class. */ | |
11436 | if (!type) | |
11437 | { | |
11438 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
11439 | return error_mark_node; | |
11440 | } | |
11441 | /* Look for the `{'. */ | |
11442 | if (!cp_parser_require (parser, CPP_OPEN_BRACE, "`{'")) | |
11443 | return error_mark_node; | |
11444 | /* Issue an error message if type-definitions are forbidden here. */ | |
11445 | cp_parser_check_type_definition (parser); | |
11446 | /* Remember that we are defining one more class. */ | |
11447 | ++parser->num_classes_being_defined; | |
11448 | /* Inside the class, surrounding template-parameter-lists do not | |
11449 | apply. */ | |
11450 | saved_num_template_parameter_lists | |
11451 | = parser->num_template_parameter_lists; | |
11452 | parser->num_template_parameter_lists = 0; | |
11453 | /* Start the class. */ | |
11454 | type = begin_class_definition (type); | |
11455 | if (type == error_mark_node) | |
11456 | /* If the type is erroneous, skip the entire body of the class. */ | |
11457 | cp_parser_skip_to_closing_brace (parser); | |
11458 | else | |
11459 | /* Parse the member-specification. */ | |
11460 | cp_parser_member_specification_opt (parser); | |
11461 | /* Look for the trailing `}'. */ | |
11462 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
11463 | /* We get better error messages by noticing a common problem: a | |
11464 | missing trailing `;'. */ | |
11465 | token = cp_lexer_peek_token (parser->lexer); | |
11466 | has_trailing_semicolon = (token->type == CPP_SEMICOLON); | |
11467 | /* Look for attributes to apply to this class. */ | |
11468 | if (cp_parser_allow_gnu_extensions_p (parser)) | |
11469 | attributes = cp_parser_attributes_opt (parser); | |
11470 | /* Finish the class definition. */ | |
11471 | type = finish_class_definition (type, | |
11472 | attributes, | |
11473 | has_trailing_semicolon, | |
11474 | nested_name_specifier_p); | |
11475 | /* If this class is not itself within the scope of another class, | |
11476 | then we need to parse the bodies of all of the queued function | |
11477 | definitions. Note that the queued functions defined in a class | |
11478 | are not always processed immediately following the | |
11479 | class-specifier for that class. Consider: | |
11480 | ||
11481 | struct A { | |
11482 | struct B { void f() { sizeof (A); } }; | |
11483 | }; | |
11484 | ||
11485 | If `f' were processed before the processing of `A' were | |
11486 | completed, there would be no way to compute the size of `A'. | |
11487 | Note that the nesting we are interested in here is lexical -- | |
11488 | not the semantic nesting given by TYPE_CONTEXT. In particular, | |
11489 | for: | |
11490 | ||
11491 | struct A { struct B; }; | |
11492 | struct A::B { void f() { } }; | |
11493 | ||
11494 | there is no need to delay the parsing of `A::B::f'. */ | |
11495 | if (--parser->num_classes_being_defined == 0) | |
11496 | { | |
11497 | tree last_scope = NULL_TREE; | |
11498 | ||
11499 | /* Process non FUNCTION_DECL related DEFAULT_ARGs. */ | |
11500 | for (parser->default_arg_types = nreverse (parser->default_arg_types); | |
11501 | parser->default_arg_types; | |
11502 | parser->default_arg_types = TREE_CHAIN (parser->default_arg_types)) | |
11503 | cp_parser_late_parsing_default_args | |
11504 | (parser, TREE_PURPOSE (parser->default_arg_types)); | |
11505 | ||
11506 | /* Reverse the queue, so that we process it in the order the | |
11507 | functions were declared. */ | |
11508 | TREE_VALUE (parser->unparsed_functions_queues) | |
11509 | = nreverse (TREE_VALUE (parser->unparsed_functions_queues)); | |
11510 | /* Loop through all of the functions. */ | |
11511 | while (TREE_VALUE (parser->unparsed_functions_queues)) | |
11512 | ||
11513 | { | |
11514 | tree fn; | |
11515 | tree fn_scope; | |
11516 | tree queue_entry; | |
11517 | ||
11518 | /* Figure out which function we need to process. */ | |
11519 | queue_entry = TREE_VALUE (parser->unparsed_functions_queues); | |
11520 | fn_scope = TREE_PURPOSE (queue_entry); | |
11521 | fn = TREE_VALUE (queue_entry); | |
11522 | ||
11523 | /* Parse the function. */ | |
11524 | cp_parser_late_parsing_for_member (parser, fn); | |
11525 | ||
11526 | TREE_VALUE (parser->unparsed_functions_queues) | |
11527 | = TREE_CHAIN (TREE_VALUE (parser->unparsed_functions_queues)); | |
11528 | } | |
11529 | ||
11530 | /* If LAST_SCOPE is non-NULL, then we have pushed scopes one | |
11531 | more time than we have popped, so me must pop here. */ | |
11532 | if (last_scope) | |
11533 | pop_scope (last_scope); | |
11534 | } | |
11535 | ||
11536 | /* Put back any saved access checks. */ | |
11537 | if (deferring_access_checks_p) | |
11538 | { | |
11539 | cp_parser_start_deferring_access_checks (parser); | |
11540 | parser->context->deferred_access_checks = saved_access_checks; | |
11541 | } | |
11542 | ||
11543 | /* Restore the count of active template-parameter-lists. */ | |
11544 | parser->num_template_parameter_lists | |
11545 | = saved_num_template_parameter_lists; | |
11546 | ||
11547 | return type; | |
11548 | } | |
11549 | ||
11550 | /* Parse a class-head. | |
11551 | ||
11552 | class-head: | |
11553 | class-key identifier [opt] base-clause [opt] | |
11554 | class-key nested-name-specifier identifier base-clause [opt] | |
11555 | class-key nested-name-specifier [opt] template-id | |
11556 | base-clause [opt] | |
11557 | ||
11558 | GNU Extensions: | |
11559 | class-key attributes identifier [opt] base-clause [opt] | |
11560 | class-key attributes nested-name-specifier identifier base-clause [opt] | |
11561 | class-key attributes nested-name-specifier [opt] template-id | |
11562 | base-clause [opt] | |
11563 | ||
11564 | Returns the TYPE of the indicated class. Sets | |
11565 | *NESTED_NAME_SPECIFIER_P to TRUE iff one of the productions | |
11566 | involving a nested-name-specifier was used, and FALSE otherwise. | |
11567 | Sets *DEFERRING_ACCESS_CHECKS_P to TRUE iff we were deferring | |
11568 | access checks before this class-head. In that case, | |
11569 | *SAVED_ACCESS_CHECKS is set to the current list of deferred access | |
11570 | checks. | |
11571 | ||
11572 | Returns NULL_TREE if the class-head is syntactically valid, but | |
11573 | semantically invalid in a way that means we should skip the entire | |
11574 | body of the class. */ | |
11575 | ||
11576 | static tree | |
11577 | cp_parser_class_head (parser, | |
11578 | nested_name_specifier_p, | |
11579 | deferring_access_checks_p, | |
11580 | saved_access_checks) | |
11581 | cp_parser *parser; | |
11582 | bool *nested_name_specifier_p; | |
11583 | bool *deferring_access_checks_p; | |
11584 | tree *saved_access_checks; | |
11585 | { | |
11586 | cp_token *token; | |
11587 | tree nested_name_specifier; | |
11588 | enum tag_types class_key; | |
11589 | tree id = NULL_TREE; | |
11590 | tree type = NULL_TREE; | |
11591 | tree attributes; | |
11592 | bool template_id_p = false; | |
11593 | bool qualified_p = false; | |
11594 | bool invalid_nested_name_p = false; | |
11595 | unsigned num_templates; | |
11596 | ||
11597 | /* Assume no nested-name-specifier will be present. */ | |
11598 | *nested_name_specifier_p = false; | |
11599 | /* Assume no template parameter lists will be used in defining the | |
11600 | type. */ | |
11601 | num_templates = 0; | |
11602 | ||
11603 | /* Look for the class-key. */ | |
11604 | class_key = cp_parser_class_key (parser); | |
11605 | if (class_key == none_type) | |
11606 | return error_mark_node; | |
11607 | ||
11608 | /* Parse the attributes. */ | |
11609 | attributes = cp_parser_attributes_opt (parser); | |
11610 | ||
11611 | /* If the next token is `::', that is invalid -- but sometimes | |
11612 | people do try to write: | |
11613 | ||
11614 | struct ::S {}; | |
11615 | ||
11616 | Handle this gracefully by accepting the extra qualifier, and then | |
11617 | issuing an error about it later if this really is a | |
11618 | class-header. If it turns out just to be an elaborated type | |
11619 | specifier, remain silent. */ | |
11620 | if (cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false)) | |
11621 | qualified_p = true; | |
11622 | ||
11623 | /* Determine the name of the class. Begin by looking for an | |
11624 | optional nested-name-specifier. */ | |
11625 | nested_name_specifier | |
11626 | = cp_parser_nested_name_specifier_opt (parser, | |
11627 | /*typename_keyword_p=*/false, | |
11628 | /*check_dependency_p=*/true, | |
11629 | /*type_p=*/false); | |
11630 | /* If there was a nested-name-specifier, then there *must* be an | |
11631 | identifier. */ | |
11632 | if (nested_name_specifier) | |
11633 | { | |
11634 | /* Although the grammar says `identifier', it really means | |
11635 | `class-name' or `template-name'. You are only allowed to | |
11636 | define a class that has already been declared with this | |
11637 | syntax. | |
11638 | ||
11639 | The proposed resolution for Core Issue 180 says that whever | |
11640 | you see `class T::X' you should treat `X' as a type-name. | |
11641 | ||
11642 | It is OK to define an inaccessible class; for example: | |
11643 | ||
11644 | class A { class B; }; | |
11645 | class A::B {}; | |
11646 | ||
11647 | So, we ask cp_parser_class_name not to check accessibility. | |
11648 | ||
11649 | We do not know if we will see a class-name, or a | |
11650 | template-name. We look for a class-name first, in case the | |
11651 | class-name is a template-id; if we looked for the | |
11652 | template-name first we would stop after the template-name. */ | |
11653 | cp_parser_parse_tentatively (parser); | |
11654 | type = cp_parser_class_name (parser, | |
11655 | /*typename_keyword_p=*/false, | |
11656 | /*template_keyword_p=*/false, | |
11657 | /*type_p=*/true, | |
11658 | /*check_access_p=*/false, | |
11659 | /*check_dependency_p=*/false, | |
11660 | /*class_head_p=*/true); | |
11661 | /* If that didn't work, ignore the nested-name-specifier. */ | |
11662 | if (!cp_parser_parse_definitely (parser)) | |
11663 | { | |
11664 | invalid_nested_name_p = true; | |
11665 | id = cp_parser_identifier (parser); | |
11666 | if (id == error_mark_node) | |
11667 | id = NULL_TREE; | |
11668 | } | |
11669 | /* If we could not find a corresponding TYPE, treat this | |
11670 | declaration like an unqualified declaration. */ | |
11671 | if (type == error_mark_node) | |
11672 | nested_name_specifier = NULL_TREE; | |
11673 | /* Otherwise, count the number of templates used in TYPE and its | |
11674 | containing scopes. */ | |
11675 | else | |
11676 | { | |
11677 | tree scope; | |
11678 | ||
11679 | for (scope = TREE_TYPE (type); | |
11680 | scope && TREE_CODE (scope) != NAMESPACE_DECL; | |
11681 | scope = (TYPE_P (scope) | |
11682 | ? TYPE_CONTEXT (scope) | |
11683 | : DECL_CONTEXT (scope))) | |
11684 | if (TYPE_P (scope) | |
11685 | && CLASS_TYPE_P (scope) | |
11686 | && CLASSTYPE_TEMPLATE_INFO (scope) | |
11687 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (scope))) | |
11688 | ++num_templates; | |
11689 | } | |
11690 | } | |
11691 | /* Otherwise, the identifier is optional. */ | |
11692 | else | |
11693 | { | |
11694 | /* We don't know whether what comes next is a template-id, | |
11695 | an identifier, or nothing at all. */ | |
11696 | cp_parser_parse_tentatively (parser); | |
11697 | /* Check for a template-id. */ | |
11698 | id = cp_parser_template_id (parser, | |
11699 | /*template_keyword_p=*/false, | |
11700 | /*check_dependency_p=*/true); | |
11701 | /* If that didn't work, it could still be an identifier. */ | |
11702 | if (!cp_parser_parse_definitely (parser)) | |
11703 | { | |
11704 | if (cp_lexer_next_token_is (parser->lexer, CPP_NAME)) | |
11705 | id = cp_parser_identifier (parser); | |
11706 | else | |
11707 | id = NULL_TREE; | |
11708 | } | |
11709 | else | |
11710 | { | |
11711 | template_id_p = true; | |
11712 | ++num_templates; | |
11713 | } | |
11714 | } | |
11715 | ||
11716 | /* If it's not a `:' or a `{' then we can't really be looking at a | |
11717 | class-head, since a class-head only appears as part of a | |
11718 | class-specifier. We have to detect this situation before calling | |
11719 | xref_tag, since that has irreversible side-effects. */ | |
11720 | if (!cp_parser_next_token_starts_class_definition_p (parser)) | |
11721 | { | |
11722 | cp_parser_error (parser, "expected `{' or `:'"); | |
11723 | return error_mark_node; | |
11724 | } | |
11725 | ||
11726 | /* At this point, we're going ahead with the class-specifier, even | |
11727 | if some other problem occurs. */ | |
11728 | cp_parser_commit_to_tentative_parse (parser); | |
11729 | /* Issue the error about the overly-qualified name now. */ | |
11730 | if (qualified_p) | |
11731 | cp_parser_error (parser, | |
11732 | "global qualification of class name is invalid"); | |
11733 | else if (invalid_nested_name_p) | |
11734 | cp_parser_error (parser, | |
11735 | "qualified name does not name a class"); | |
11736 | /* Make sure that the right number of template parameters were | |
11737 | present. */ | |
11738 | if (!cp_parser_check_template_parameters (parser, num_templates)) | |
11739 | /* If something went wrong, there is no point in even trying to | |
11740 | process the class-definition. */ | |
11741 | return NULL_TREE; | |
11742 | ||
11743 | /* We do not need to defer access checks for entities declared | |
11744 | within the class. But, we do need to save any access checks that | |
11745 | are currently deferred and restore them later, in case we are in | |
11746 | the middle of something else. */ | |
11747 | *deferring_access_checks_p = parser->context->deferring_access_checks_p; | |
11748 | if (*deferring_access_checks_p) | |
11749 | *saved_access_checks = cp_parser_stop_deferring_access_checks (parser); | |
11750 | ||
11751 | /* Look up the type. */ | |
11752 | if (template_id_p) | |
11753 | { | |
11754 | type = TREE_TYPE (id); | |
11755 | maybe_process_partial_specialization (type); | |
11756 | } | |
11757 | else if (!nested_name_specifier) | |
11758 | { | |
11759 | /* If the class was unnamed, create a dummy name. */ | |
11760 | if (!id) | |
11761 | id = make_anon_name (); | |
11762 | type = xref_tag (class_key, id, attributes, /*globalize=*/0); | |
11763 | } | |
11764 | else | |
11765 | { | |
848eed92 | 11766 | bool new_type_p; |
a723baf1 MM |
11767 | tree class_type; |
11768 | ||
11769 | /* Given: | |
11770 | ||
11771 | template <typename T> struct S { struct T }; | |
11772 | template <typename T> struct S::T { }; | |
11773 | ||
11774 | we will get a TYPENAME_TYPE when processing the definition of | |
11775 | `S::T'. We need to resolve it to the actual type before we | |
11776 | try to define it. */ | |
11777 | if (TREE_CODE (TREE_TYPE (type)) == TYPENAME_TYPE) | |
11778 | { | |
11779 | type = cp_parser_resolve_typename_type (parser, TREE_TYPE (type)); | |
11780 | if (type != error_mark_node) | |
11781 | type = TYPE_NAME (type); | |
11782 | } | |
11783 | ||
11784 | maybe_process_partial_specialization (TREE_TYPE (type)); | |
11785 | class_type = current_class_type; | |
11786 | type = TREE_TYPE (handle_class_head (class_key, | |
11787 | nested_name_specifier, | |
11788 | type, | |
11789 | attributes, | |
848eed92 | 11790 | /*defn_p=*/true, |
a723baf1 MM |
11791 | &new_type_p)); |
11792 | if (type != error_mark_node) | |
11793 | { | |
11794 | if (!class_type && TYPE_CONTEXT (type)) | |
11795 | *nested_name_specifier_p = true; | |
11796 | else if (class_type && !same_type_p (TYPE_CONTEXT (type), | |
11797 | class_type)) | |
11798 | *nested_name_specifier_p = true; | |
11799 | } | |
11800 | } | |
11801 | /* Indicate whether this class was declared as a `class' or as a | |
11802 | `struct'. */ | |
11803 | if (TREE_CODE (type) == RECORD_TYPE) | |
11804 | CLASSTYPE_DECLARED_CLASS (type) = (class_key == class_type); | |
11805 | cp_parser_check_class_key (class_key, type); | |
11806 | ||
11807 | /* Enter the scope containing the class; the names of base classes | |
11808 | should be looked up in that context. For example, given: | |
11809 | ||
11810 | struct A { struct B {}; struct C; }; | |
11811 | struct A::C : B {}; | |
11812 | ||
11813 | is valid. */ | |
11814 | if (nested_name_specifier) | |
11815 | push_scope (nested_name_specifier); | |
11816 | /* Now, look for the base-clause. */ | |
11817 | token = cp_lexer_peek_token (parser->lexer); | |
11818 | if (token->type == CPP_COLON) | |
11819 | { | |
11820 | tree bases; | |
11821 | ||
11822 | /* Get the list of base-classes. */ | |
11823 | bases = cp_parser_base_clause (parser); | |
11824 | /* Process them. */ | |
11825 | xref_basetypes (type, bases); | |
11826 | } | |
11827 | /* Leave the scope given by the nested-name-specifier. We will | |
11828 | enter the class scope itself while processing the members. */ | |
11829 | if (nested_name_specifier) | |
11830 | pop_scope (nested_name_specifier); | |
11831 | ||
11832 | return type; | |
11833 | } | |
11834 | ||
11835 | /* Parse a class-key. | |
11836 | ||
11837 | class-key: | |
11838 | class | |
11839 | struct | |
11840 | union | |
11841 | ||
11842 | Returns the kind of class-key specified, or none_type to indicate | |
11843 | error. */ | |
11844 | ||
11845 | static enum tag_types | |
11846 | cp_parser_class_key (parser) | |
11847 | cp_parser *parser; | |
11848 | { | |
11849 | cp_token *token; | |
11850 | enum tag_types tag_type; | |
11851 | ||
11852 | /* Look for the class-key. */ | |
11853 | token = cp_parser_require (parser, CPP_KEYWORD, "class-key"); | |
11854 | if (!token) | |
11855 | return none_type; | |
11856 | ||
11857 | /* Check to see if the TOKEN is a class-key. */ | |
11858 | tag_type = cp_parser_token_is_class_key (token); | |
11859 | if (!tag_type) | |
11860 | cp_parser_error (parser, "expected class-key"); | |
11861 | return tag_type; | |
11862 | } | |
11863 | ||
11864 | /* Parse an (optional) member-specification. | |
11865 | ||
11866 | member-specification: | |
11867 | member-declaration member-specification [opt] | |
11868 | access-specifier : member-specification [opt] */ | |
11869 | ||
11870 | static void | |
11871 | cp_parser_member_specification_opt (parser) | |
11872 | cp_parser *parser; | |
11873 | { | |
11874 | while (true) | |
11875 | { | |
11876 | cp_token *token; | |
11877 | enum rid keyword; | |
11878 | ||
11879 | /* Peek at the next token. */ | |
11880 | token = cp_lexer_peek_token (parser->lexer); | |
11881 | /* If it's a `}', or EOF then we've seen all the members. */ | |
11882 | if (token->type == CPP_CLOSE_BRACE || token->type == CPP_EOF) | |
11883 | break; | |
11884 | ||
11885 | /* See if this token is a keyword. */ | |
11886 | keyword = token->keyword; | |
11887 | switch (keyword) | |
11888 | { | |
11889 | case RID_PUBLIC: | |
11890 | case RID_PROTECTED: | |
11891 | case RID_PRIVATE: | |
11892 | /* Consume the access-specifier. */ | |
11893 | cp_lexer_consume_token (parser->lexer); | |
11894 | /* Remember which access-specifier is active. */ | |
11895 | current_access_specifier = token->value; | |
11896 | /* Look for the `:'. */ | |
11897 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
11898 | break; | |
11899 | ||
11900 | default: | |
11901 | /* Otherwise, the next construction must be a | |
11902 | member-declaration. */ | |
11903 | cp_parser_member_declaration (parser); | |
11904 | reset_type_access_control (); | |
11905 | } | |
11906 | } | |
11907 | } | |
11908 | ||
11909 | /* Parse a member-declaration. | |
11910 | ||
11911 | member-declaration: | |
11912 | decl-specifier-seq [opt] member-declarator-list [opt] ; | |
11913 | function-definition ; [opt] | |
11914 | :: [opt] nested-name-specifier template [opt] unqualified-id ; | |
11915 | using-declaration | |
11916 | template-declaration | |
11917 | ||
11918 | member-declarator-list: | |
11919 | member-declarator | |
11920 | member-declarator-list , member-declarator | |
11921 | ||
11922 | member-declarator: | |
11923 | declarator pure-specifier [opt] | |
11924 | declarator constant-initializer [opt] | |
11925 | identifier [opt] : constant-expression | |
11926 | ||
11927 | GNU Extensions: | |
11928 | ||
11929 | member-declaration: | |
11930 | __extension__ member-declaration | |
11931 | ||
11932 | member-declarator: | |
11933 | declarator attributes [opt] pure-specifier [opt] | |
11934 | declarator attributes [opt] constant-initializer [opt] | |
11935 | identifier [opt] attributes [opt] : constant-expression */ | |
11936 | ||
11937 | static void | |
11938 | cp_parser_member_declaration (parser) | |
11939 | cp_parser *parser; | |
11940 | { | |
11941 | tree decl_specifiers; | |
11942 | tree prefix_attributes; | |
11943 | tree decl; | |
11944 | bool declares_class_or_enum; | |
11945 | bool friend_p; | |
11946 | cp_token *token; | |
11947 | int saved_pedantic; | |
11948 | ||
11949 | /* Check for the `__extension__' keyword. */ | |
11950 | if (cp_parser_extension_opt (parser, &saved_pedantic)) | |
11951 | { | |
11952 | /* Recurse. */ | |
11953 | cp_parser_member_declaration (parser); | |
11954 | /* Restore the old value of the PEDANTIC flag. */ | |
11955 | pedantic = saved_pedantic; | |
11956 | ||
11957 | return; | |
11958 | } | |
11959 | ||
11960 | /* Check for a template-declaration. */ | |
11961 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
11962 | { | |
11963 | /* Parse the template-declaration. */ | |
11964 | cp_parser_template_declaration (parser, /*member_p=*/true); | |
11965 | ||
11966 | return; | |
11967 | } | |
11968 | ||
11969 | /* Check for a using-declaration. */ | |
11970 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_USING)) | |
11971 | { | |
11972 | /* Parse the using-declaration. */ | |
11973 | cp_parser_using_declaration (parser); | |
11974 | ||
11975 | return; | |
11976 | } | |
11977 | ||
11978 | /* We can't tell whether we're looking at a declaration or a | |
11979 | function-definition. */ | |
11980 | cp_parser_parse_tentatively (parser); | |
11981 | ||
11982 | /* Parse the decl-specifier-seq. */ | |
11983 | decl_specifiers | |
11984 | = cp_parser_decl_specifier_seq (parser, | |
11985 | CP_PARSER_FLAGS_OPTIONAL, | |
11986 | &prefix_attributes, | |
11987 | &declares_class_or_enum); | |
11988 | /* If there is no declarator, then the decl-specifier-seq should | |
11989 | specify a type. */ | |
11990 | if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
11991 | { | |
11992 | /* If there was no decl-specifier-seq, and the next token is a | |
11993 | `;', then we have something like: | |
11994 | ||
11995 | struct S { ; }; | |
11996 | ||
11997 | [class.mem] | |
11998 | ||
11999 | Each member-declaration shall declare at least one member | |
12000 | name of the class. */ | |
12001 | if (!decl_specifiers) | |
12002 | { | |
12003 | if (pedantic) | |
12004 | pedwarn ("extra semicolon"); | |
12005 | } | |
12006 | else | |
12007 | { | |
12008 | tree type; | |
12009 | ||
12010 | /* See if this declaration is a friend. */ | |
12011 | friend_p = cp_parser_friend_p (decl_specifiers); | |
12012 | /* If there were decl-specifiers, check to see if there was | |
12013 | a class-declaration. */ | |
12014 | type = check_tag_decl (decl_specifiers); | |
12015 | /* Nested classes have already been added to the class, but | |
12016 | a `friend' needs to be explicitly registered. */ | |
12017 | if (friend_p) | |
12018 | { | |
12019 | /* If the `friend' keyword was present, the friend must | |
12020 | be introduced with a class-key. */ | |
12021 | if (!declares_class_or_enum) | |
12022 | error ("a class-key must be used when declaring a friend"); | |
12023 | /* In this case: | |
12024 | ||
12025 | template <typename T> struct A { | |
12026 | friend struct A<T>::B; | |
12027 | }; | |
12028 | ||
12029 | A<T>::B will be represented by a TYPENAME_TYPE, and | |
12030 | therefore not recognized by check_tag_decl. */ | |
12031 | if (!type) | |
12032 | { | |
12033 | tree specifier; | |
12034 | ||
12035 | for (specifier = decl_specifiers; | |
12036 | specifier; | |
12037 | specifier = TREE_CHAIN (specifier)) | |
12038 | { | |
12039 | tree s = TREE_VALUE (specifier); | |
12040 | ||
12041 | if (TREE_CODE (s) == IDENTIFIER_NODE | |
12042 | && IDENTIFIER_GLOBAL_VALUE (s)) | |
12043 | type = IDENTIFIER_GLOBAL_VALUE (s); | |
12044 | if (TREE_CODE (s) == TYPE_DECL) | |
12045 | s = TREE_TYPE (s); | |
12046 | if (TYPE_P (s)) | |
12047 | { | |
12048 | type = s; | |
12049 | break; | |
12050 | } | |
12051 | } | |
12052 | } | |
12053 | if (!type) | |
12054 | error ("friend declaration does not name a class or " | |
12055 | "function"); | |
12056 | else | |
12057 | make_friend_class (current_class_type, type); | |
12058 | } | |
12059 | /* If there is no TYPE, an error message will already have | |
12060 | been issued. */ | |
12061 | else if (!type) | |
12062 | ; | |
12063 | /* An anonymous aggregate has to be handled specially; such | |
12064 | a declaration really declares a data member (with a | |
12065 | particular type), as opposed to a nested class. */ | |
12066 | else if (ANON_AGGR_TYPE_P (type)) | |
12067 | { | |
12068 | /* Remove constructors and such from TYPE, now that we | |
12069 | know it is an anoymous aggregate. */ | |
12070 | fixup_anonymous_aggr (type); | |
12071 | /* And make the corresponding data member. */ | |
12072 | decl = build_decl (FIELD_DECL, NULL_TREE, type); | |
12073 | /* Add it to the class. */ | |
12074 | finish_member_declaration (decl); | |
12075 | } | |
12076 | } | |
12077 | } | |
12078 | else | |
12079 | { | |
12080 | /* See if these declarations will be friends. */ | |
12081 | friend_p = cp_parser_friend_p (decl_specifiers); | |
12082 | ||
12083 | /* Keep going until we hit the `;' at the end of the | |
12084 | declaration. */ | |
12085 | while (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON)) | |
12086 | { | |
12087 | tree attributes = NULL_TREE; | |
12088 | tree first_attribute; | |
12089 | ||
12090 | /* Peek at the next token. */ | |
12091 | token = cp_lexer_peek_token (parser->lexer); | |
12092 | ||
12093 | /* Check for a bitfield declaration. */ | |
12094 | if (token->type == CPP_COLON | |
12095 | || (token->type == CPP_NAME | |
12096 | && cp_lexer_peek_nth_token (parser->lexer, 2)->type | |
12097 | == CPP_COLON)) | |
12098 | { | |
12099 | tree identifier; | |
12100 | tree width; | |
12101 | ||
12102 | /* Get the name of the bitfield. Note that we cannot just | |
12103 | check TOKEN here because it may have been invalidated by | |
12104 | the call to cp_lexer_peek_nth_token above. */ | |
12105 | if (cp_lexer_peek_token (parser->lexer)->type != CPP_COLON) | |
12106 | identifier = cp_parser_identifier (parser); | |
12107 | else | |
12108 | identifier = NULL_TREE; | |
12109 | ||
12110 | /* Consume the `:' token. */ | |
12111 | cp_lexer_consume_token (parser->lexer); | |
12112 | /* Get the width of the bitfield. */ | |
12113 | width = cp_parser_constant_expression (parser); | |
12114 | ||
12115 | /* Look for attributes that apply to the bitfield. */ | |
12116 | attributes = cp_parser_attributes_opt (parser); | |
12117 | /* Remember which attributes are prefix attributes and | |
12118 | which are not. */ | |
12119 | first_attribute = attributes; | |
12120 | /* Combine the attributes. */ | |
12121 | attributes = chainon (prefix_attributes, attributes); | |
12122 | ||
12123 | /* Create the bitfield declaration. */ | |
12124 | decl = grokbitfield (identifier, | |
12125 | decl_specifiers, | |
12126 | width); | |
12127 | /* Apply the attributes. */ | |
12128 | cplus_decl_attributes (&decl, attributes, /*flags=*/0); | |
12129 | } | |
12130 | else | |
12131 | { | |
12132 | tree declarator; | |
12133 | tree initializer; | |
12134 | tree asm_specification; | |
12135 | bool ctor_dtor_or_conv_p; | |
12136 | ||
12137 | /* Parse the declarator. */ | |
12138 | declarator | |
12139 | = cp_parser_declarator (parser, | |
12140 | /*abstract_p=*/false, | |
12141 | &ctor_dtor_or_conv_p); | |
12142 | ||
12143 | /* If something went wrong parsing the declarator, make sure | |
12144 | that we at least consume some tokens. */ | |
12145 | if (declarator == error_mark_node) | |
12146 | { | |
12147 | /* Skip to the end of the statement. */ | |
12148 | cp_parser_skip_to_end_of_statement (parser); | |
12149 | break; | |
12150 | } | |
12151 | ||
12152 | /* Look for an asm-specification. */ | |
12153 | asm_specification = cp_parser_asm_specification_opt (parser); | |
12154 | /* Look for attributes that apply to the declaration. */ | |
12155 | attributes = cp_parser_attributes_opt (parser); | |
12156 | /* Remember which attributes are prefix attributes and | |
12157 | which are not. */ | |
12158 | first_attribute = attributes; | |
12159 | /* Combine the attributes. */ | |
12160 | attributes = chainon (prefix_attributes, attributes); | |
12161 | ||
12162 | /* If it's an `=', then we have a constant-initializer or a | |
12163 | pure-specifier. It is not correct to parse the | |
12164 | initializer before registering the member declaration | |
12165 | since the member declaration should be in scope while | |
12166 | its initializer is processed. However, the rest of the | |
12167 | front end does not yet provide an interface that allows | |
12168 | us to handle this correctly. */ | |
12169 | if (cp_lexer_next_token_is (parser->lexer, CPP_EQ)) | |
12170 | { | |
12171 | /* In [class.mem]: | |
12172 | ||
12173 | A pure-specifier shall be used only in the declaration of | |
12174 | a virtual function. | |
12175 | ||
12176 | A member-declarator can contain a constant-initializer | |
12177 | only if it declares a static member of integral or | |
12178 | enumeration type. | |
12179 | ||
12180 | Therefore, if the DECLARATOR is for a function, we look | |
12181 | for a pure-specifier; otherwise, we look for a | |
12182 | constant-initializer. When we call `grokfield', it will | |
12183 | perform more stringent semantics checks. */ | |
12184 | if (TREE_CODE (declarator) == CALL_EXPR) | |
12185 | initializer = cp_parser_pure_specifier (parser); | |
12186 | else | |
12187 | { | |
12188 | /* This declaration cannot be a function | |
12189 | definition. */ | |
12190 | cp_parser_commit_to_tentative_parse (parser); | |
12191 | /* Parse the initializer. */ | |
12192 | initializer = cp_parser_constant_initializer (parser); | |
12193 | } | |
12194 | } | |
12195 | /* Otherwise, there is no initializer. */ | |
12196 | else | |
12197 | initializer = NULL_TREE; | |
12198 | ||
12199 | /* See if we are probably looking at a function | |
12200 | definition. We are certainly not looking at at a | |
12201 | member-declarator. Calling `grokfield' has | |
12202 | side-effects, so we must not do it unless we are sure | |
12203 | that we are looking at a member-declarator. */ | |
12204 | if (cp_parser_token_starts_function_definition_p | |
12205 | (cp_lexer_peek_token (parser->lexer))) | |
12206 | decl = error_mark_node; | |
12207 | else | |
12208 | /* Create the declaration. */ | |
12209 | decl = grokfield (declarator, | |
12210 | decl_specifiers, | |
12211 | initializer, | |
12212 | asm_specification, | |
12213 | attributes); | |
12214 | } | |
12215 | ||
12216 | /* Reset PREFIX_ATTRIBUTES. */ | |
12217 | while (attributes && TREE_CHAIN (attributes) != first_attribute) | |
12218 | attributes = TREE_CHAIN (attributes); | |
12219 | if (attributes) | |
12220 | TREE_CHAIN (attributes) = NULL_TREE; | |
12221 | ||
12222 | /* If there is any qualification still in effect, clear it | |
12223 | now; we will be starting fresh with the next declarator. */ | |
12224 | parser->scope = NULL_TREE; | |
12225 | parser->qualifying_scope = NULL_TREE; | |
12226 | parser->object_scope = NULL_TREE; | |
12227 | /* If it's a `,', then there are more declarators. */ | |
12228 | if (cp_lexer_next_token_is (parser->lexer, CPP_COMMA)) | |
12229 | cp_lexer_consume_token (parser->lexer); | |
12230 | /* If the next token isn't a `;', then we have a parse error. */ | |
12231 | else if (cp_lexer_next_token_is_not (parser->lexer, | |
12232 | CPP_SEMICOLON)) | |
12233 | { | |
12234 | cp_parser_error (parser, "expected `;'"); | |
12235 | /* Skip tokens until we find a `;' */ | |
12236 | cp_parser_skip_to_end_of_statement (parser); | |
12237 | ||
12238 | break; | |
12239 | } | |
12240 | ||
12241 | if (decl) | |
12242 | { | |
12243 | /* Add DECL to the list of members. */ | |
12244 | if (!friend_p) | |
12245 | finish_member_declaration (decl); | |
12246 | ||
12247 | /* If DECL is a function, we must return | |
12248 | to parse it later. (Even though there is no definition, | |
12249 | there might be default arguments that need handling.) */ | |
12250 | if (TREE_CODE (decl) == FUNCTION_DECL) | |
12251 | TREE_VALUE (parser->unparsed_functions_queues) | |
12252 | = tree_cons (current_class_type, decl, | |
12253 | TREE_VALUE (parser->unparsed_functions_queues)); | |
12254 | } | |
12255 | } | |
12256 | } | |
12257 | ||
12258 | /* If everything went well, look for the `;'. */ | |
12259 | if (cp_parser_parse_definitely (parser)) | |
12260 | { | |
12261 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
12262 | return; | |
12263 | } | |
12264 | ||
12265 | /* Parse the function-definition. */ | |
12266 | decl = cp_parser_function_definition (parser, &friend_p); | |
12267 | /* If the member was not a friend, declare it here. */ | |
12268 | if (!friend_p) | |
12269 | finish_member_declaration (decl); | |
12270 | /* Peek at the next token. */ | |
12271 | token = cp_lexer_peek_token (parser->lexer); | |
12272 | /* If the next token is a semicolon, consume it. */ | |
12273 | if (token->type == CPP_SEMICOLON) | |
12274 | cp_lexer_consume_token (parser->lexer); | |
12275 | } | |
12276 | ||
12277 | /* Parse a pure-specifier. | |
12278 | ||
12279 | pure-specifier: | |
12280 | = 0 | |
12281 | ||
12282 | Returns INTEGER_ZERO_NODE if a pure specifier is found. | |
12283 | Otherwiser, ERROR_MARK_NODE is returned. */ | |
12284 | ||
12285 | static tree | |
12286 | cp_parser_pure_specifier (parser) | |
12287 | cp_parser *parser; | |
12288 | { | |
12289 | cp_token *token; | |
12290 | ||
12291 | /* Look for the `=' token. */ | |
12292 | if (!cp_parser_require (parser, CPP_EQ, "`='")) | |
12293 | return error_mark_node; | |
12294 | /* Look for the `0' token. */ | |
12295 | token = cp_parser_require (parser, CPP_NUMBER, "`0'"); | |
12296 | /* Unfortunately, this will accept `0L' and `0x00' as well. We need | |
12297 | to get information from the lexer about how the number was | |
12298 | spelled in order to fix this problem. */ | |
12299 | if (!token || !integer_zerop (token->value)) | |
12300 | return error_mark_node; | |
12301 | ||
12302 | return integer_zero_node; | |
12303 | } | |
12304 | ||
12305 | /* Parse a constant-initializer. | |
12306 | ||
12307 | constant-initializer: | |
12308 | = constant-expression | |
12309 | ||
12310 | Returns a representation of the constant-expression. */ | |
12311 | ||
12312 | static tree | |
12313 | cp_parser_constant_initializer (parser) | |
12314 | cp_parser *parser; | |
12315 | { | |
12316 | /* Look for the `=' token. */ | |
12317 | if (!cp_parser_require (parser, CPP_EQ, "`='")) | |
12318 | return error_mark_node; | |
12319 | ||
12320 | /* It is invalid to write: | |
12321 | ||
12322 | struct S { static const int i = { 7 }; }; | |
12323 | ||
12324 | */ | |
12325 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_BRACE)) | |
12326 | { | |
12327 | cp_parser_error (parser, | |
12328 | "a brace-enclosed initializer is not allowed here"); | |
12329 | /* Consume the opening brace. */ | |
12330 | cp_lexer_consume_token (parser->lexer); | |
12331 | /* Skip the initializer. */ | |
12332 | cp_parser_skip_to_closing_brace (parser); | |
12333 | /* Look for the trailing `}'. */ | |
12334 | cp_parser_require (parser, CPP_CLOSE_BRACE, "`}'"); | |
12335 | ||
12336 | return error_mark_node; | |
12337 | } | |
12338 | ||
12339 | return cp_parser_constant_expression (parser); | |
12340 | } | |
12341 | ||
12342 | /* Derived classes [gram.class.derived] */ | |
12343 | ||
12344 | /* Parse a base-clause. | |
12345 | ||
12346 | base-clause: | |
12347 | : base-specifier-list | |
12348 | ||
12349 | base-specifier-list: | |
12350 | base-specifier | |
12351 | base-specifier-list , base-specifier | |
12352 | ||
12353 | Returns a TREE_LIST representing the base-classes, in the order in | |
12354 | which they were declared. The representation of each node is as | |
12355 | described by cp_parser_base_specifier. | |
12356 | ||
12357 | In the case that no bases are specified, this function will return | |
12358 | NULL_TREE, not ERROR_MARK_NODE. */ | |
12359 | ||
12360 | static tree | |
12361 | cp_parser_base_clause (parser) | |
12362 | cp_parser *parser; | |
12363 | { | |
12364 | tree bases = NULL_TREE; | |
12365 | ||
12366 | /* Look for the `:' that begins the list. */ | |
12367 | cp_parser_require (parser, CPP_COLON, "`:'"); | |
12368 | ||
12369 | /* Scan the base-specifier-list. */ | |
12370 | while (true) | |
12371 | { | |
12372 | cp_token *token; | |
12373 | tree base; | |
12374 | ||
12375 | /* Look for the base-specifier. */ | |
12376 | base = cp_parser_base_specifier (parser); | |
12377 | /* Add BASE to the front of the list. */ | |
12378 | if (base != error_mark_node) | |
12379 | { | |
12380 | TREE_CHAIN (base) = bases; | |
12381 | bases = base; | |
12382 | } | |
12383 | /* Peek at the next token. */ | |
12384 | token = cp_lexer_peek_token (parser->lexer); | |
12385 | /* If it's not a comma, then the list is complete. */ | |
12386 | if (token->type != CPP_COMMA) | |
12387 | break; | |
12388 | /* Consume the `,'. */ | |
12389 | cp_lexer_consume_token (parser->lexer); | |
12390 | } | |
12391 | ||
12392 | /* PARSER->SCOPE may still be non-NULL at this point, if the last | |
12393 | base class had a qualified name. However, the next name that | |
12394 | appears is certainly not qualified. */ | |
12395 | parser->scope = NULL_TREE; | |
12396 | parser->qualifying_scope = NULL_TREE; | |
12397 | parser->object_scope = NULL_TREE; | |
12398 | ||
12399 | return nreverse (bases); | |
12400 | } | |
12401 | ||
12402 | /* Parse a base-specifier. | |
12403 | ||
12404 | base-specifier: | |
12405 | :: [opt] nested-name-specifier [opt] class-name | |
12406 | virtual access-specifier [opt] :: [opt] nested-name-specifier | |
12407 | [opt] class-name | |
12408 | access-specifier virtual [opt] :: [opt] nested-name-specifier | |
12409 | [opt] class-name | |
12410 | ||
12411 | Returns a TREE_LIST. The TREE_PURPOSE will be one of | |
12412 | ACCESS_{DEFAULT,PUBLIC,PROTECTED,PRIVATE}_[VIRTUAL]_NODE to | |
12413 | indicate the specifiers provided. The TREE_VALUE will be a TYPE | |
12414 | (or the ERROR_MARK_NODE) indicating the type that was specified. */ | |
12415 | ||
12416 | static tree | |
12417 | cp_parser_base_specifier (parser) | |
12418 | cp_parser *parser; | |
12419 | { | |
12420 | cp_token *token; | |
12421 | bool done = false; | |
12422 | bool virtual_p = false; | |
12423 | bool duplicate_virtual_error_issued_p = false; | |
12424 | bool duplicate_access_error_issued_p = false; | |
12425 | bool class_scope_p; | |
12426 | access_kind access = ak_none; | |
12427 | tree access_node; | |
12428 | tree type; | |
12429 | ||
12430 | /* Process the optional `virtual' and `access-specifier'. */ | |
12431 | while (!done) | |
12432 | { | |
12433 | /* Peek at the next token. */ | |
12434 | token = cp_lexer_peek_token (parser->lexer); | |
12435 | /* Process `virtual'. */ | |
12436 | switch (token->keyword) | |
12437 | { | |
12438 | case RID_VIRTUAL: | |
12439 | /* If `virtual' appears more than once, issue an error. */ | |
12440 | if (virtual_p && !duplicate_virtual_error_issued_p) | |
12441 | { | |
12442 | cp_parser_error (parser, | |
12443 | "`virtual' specified more than once in base-specified"); | |
12444 | duplicate_virtual_error_issued_p = true; | |
12445 | } | |
12446 | ||
12447 | virtual_p = true; | |
12448 | ||
12449 | /* Consume the `virtual' token. */ | |
12450 | cp_lexer_consume_token (parser->lexer); | |
12451 | ||
12452 | break; | |
12453 | ||
12454 | case RID_PUBLIC: | |
12455 | case RID_PROTECTED: | |
12456 | case RID_PRIVATE: | |
12457 | /* If more than one access specifier appears, issue an | |
12458 | error. */ | |
12459 | if (access != ak_none && !duplicate_access_error_issued_p) | |
12460 | { | |
12461 | cp_parser_error (parser, | |
12462 | "more than one access specifier in base-specified"); | |
12463 | duplicate_access_error_issued_p = true; | |
12464 | } | |
12465 | ||
12466 | access = ((access_kind) | |
12467 | tree_low_cst (ridpointers[(int) token->keyword], | |
12468 | /*pos=*/1)); | |
12469 | ||
12470 | /* Consume the access-specifier. */ | |
12471 | cp_lexer_consume_token (parser->lexer); | |
12472 | ||
12473 | break; | |
12474 | ||
12475 | default: | |
12476 | done = true; | |
12477 | break; | |
12478 | } | |
12479 | } | |
12480 | ||
12481 | /* Map `virtual_p' and `access' onto one of the access | |
12482 | tree-nodes. */ | |
12483 | if (!virtual_p) | |
12484 | switch (access) | |
12485 | { | |
12486 | case ak_none: | |
12487 | access_node = access_default_node; | |
12488 | break; | |
12489 | case ak_public: | |
12490 | access_node = access_public_node; | |
12491 | break; | |
12492 | case ak_protected: | |
12493 | access_node = access_protected_node; | |
12494 | break; | |
12495 | case ak_private: | |
12496 | access_node = access_private_node; | |
12497 | break; | |
12498 | default: | |
12499 | abort (); | |
12500 | } | |
12501 | else | |
12502 | switch (access) | |
12503 | { | |
12504 | case ak_none: | |
12505 | access_node = access_default_virtual_node; | |
12506 | break; | |
12507 | case ak_public: | |
12508 | access_node = access_public_virtual_node; | |
12509 | break; | |
12510 | case ak_protected: | |
12511 | access_node = access_protected_virtual_node; | |
12512 | break; | |
12513 | case ak_private: | |
12514 | access_node = access_private_virtual_node; | |
12515 | break; | |
12516 | default: | |
12517 | abort (); | |
12518 | } | |
12519 | ||
12520 | /* Look for the optional `::' operator. */ | |
12521 | cp_parser_global_scope_opt (parser, /*current_scope_valid_p=*/false); | |
12522 | /* Look for the nested-name-specifier. The simplest way to | |
12523 | implement: | |
12524 | ||
12525 | [temp.res] | |
12526 | ||
12527 | The keyword `typename' is not permitted in a base-specifier or | |
12528 | mem-initializer; in these contexts a qualified name that | |
12529 | depends on a template-parameter is implicitly assumed to be a | |
12530 | type name. | |
12531 | ||
12532 | is to pretend that we have seen the `typename' keyword at this | |
12533 | point. */ | |
12534 | cp_parser_nested_name_specifier_opt (parser, | |
12535 | /*typename_keyword_p=*/true, | |
12536 | /*check_dependency_p=*/true, | |
12537 | /*type_p=*/true); | |
12538 | /* If the base class is given by a qualified name, assume that names | |
12539 | we see are type names or templates, as appropriate. */ | |
12540 | class_scope_p = (parser->scope && TYPE_P (parser->scope)); | |
12541 | /* Finally, look for the class-name. */ | |
12542 | type = cp_parser_class_name (parser, | |
12543 | class_scope_p, | |
12544 | class_scope_p, | |
12545 | /*type_p=*/true, | |
12546 | /*check_access=*/true, | |
12547 | /*check_dependency_p=*/true, | |
12548 | /*class_head_p=*/false); | |
12549 | ||
12550 | if (type == error_mark_node) | |
12551 | return error_mark_node; | |
12552 | ||
12553 | return finish_base_specifier (access_node, TREE_TYPE (type)); | |
12554 | } | |
12555 | ||
12556 | /* Exception handling [gram.exception] */ | |
12557 | ||
12558 | /* Parse an (optional) exception-specification. | |
12559 | ||
12560 | exception-specification: | |
12561 | throw ( type-id-list [opt] ) | |
12562 | ||
12563 | Returns a TREE_LIST representing the exception-specification. The | |
12564 | TREE_VALUE of each node is a type. */ | |
12565 | ||
12566 | static tree | |
12567 | cp_parser_exception_specification_opt (parser) | |
12568 | cp_parser *parser; | |
12569 | { | |
12570 | cp_token *token; | |
12571 | tree type_id_list; | |
12572 | ||
12573 | /* Peek at the next token. */ | |
12574 | token = cp_lexer_peek_token (parser->lexer); | |
12575 | /* If it's not `throw', then there's no exception-specification. */ | |
12576 | if (!cp_parser_is_keyword (token, RID_THROW)) | |
12577 | return NULL_TREE; | |
12578 | ||
12579 | /* Consume the `throw'. */ | |
12580 | cp_lexer_consume_token (parser->lexer); | |
12581 | ||
12582 | /* Look for the `('. */ | |
12583 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12584 | ||
12585 | /* Peek at the next token. */ | |
12586 | token = cp_lexer_peek_token (parser->lexer); | |
12587 | /* If it's not a `)', then there is a type-id-list. */ | |
12588 | if (token->type != CPP_CLOSE_PAREN) | |
12589 | { | |
12590 | const char *saved_message; | |
12591 | ||
12592 | /* Types may not be defined in an exception-specification. */ | |
12593 | saved_message = parser->type_definition_forbidden_message; | |
12594 | parser->type_definition_forbidden_message | |
12595 | = "types may not be defined in an exception-specification"; | |
12596 | /* Parse the type-id-list. */ | |
12597 | type_id_list = cp_parser_type_id_list (parser); | |
12598 | /* Restore the saved message. */ | |
12599 | parser->type_definition_forbidden_message = saved_message; | |
12600 | } | |
12601 | else | |
12602 | type_id_list = empty_except_spec; | |
12603 | ||
12604 | /* Look for the `)'. */ | |
12605 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12606 | ||
12607 | return type_id_list; | |
12608 | } | |
12609 | ||
12610 | /* Parse an (optional) type-id-list. | |
12611 | ||
12612 | type-id-list: | |
12613 | type-id | |
12614 | type-id-list , type-id | |
12615 | ||
12616 | Returns a TREE_LIST. The TREE_VALUE of each node is a TYPE, | |
12617 | in the order that the types were presented. */ | |
12618 | ||
12619 | static tree | |
12620 | cp_parser_type_id_list (parser) | |
12621 | cp_parser *parser; | |
12622 | { | |
12623 | tree types = NULL_TREE; | |
12624 | ||
12625 | while (true) | |
12626 | { | |
12627 | cp_token *token; | |
12628 | tree type; | |
12629 | ||
12630 | /* Get the next type-id. */ | |
12631 | type = cp_parser_type_id (parser); | |
12632 | /* Add it to the list. */ | |
12633 | types = add_exception_specifier (types, type, /*complain=*/1); | |
12634 | /* Peek at the next token. */ | |
12635 | token = cp_lexer_peek_token (parser->lexer); | |
12636 | /* If it is not a `,', we are done. */ | |
12637 | if (token->type != CPP_COMMA) | |
12638 | break; | |
12639 | /* Consume the `,'. */ | |
12640 | cp_lexer_consume_token (parser->lexer); | |
12641 | } | |
12642 | ||
12643 | return nreverse (types); | |
12644 | } | |
12645 | ||
12646 | /* Parse a try-block. | |
12647 | ||
12648 | try-block: | |
12649 | try compound-statement handler-seq */ | |
12650 | ||
12651 | static tree | |
12652 | cp_parser_try_block (parser) | |
12653 | cp_parser *parser; | |
12654 | { | |
12655 | tree try_block; | |
12656 | ||
12657 | cp_parser_require_keyword (parser, RID_TRY, "`try'"); | |
12658 | try_block = begin_try_block (); | |
12659 | cp_parser_compound_statement (parser); | |
12660 | finish_try_block (try_block); | |
12661 | cp_parser_handler_seq (parser); | |
12662 | finish_handler_sequence (try_block); | |
12663 | ||
12664 | return try_block; | |
12665 | } | |
12666 | ||
12667 | /* Parse a function-try-block. | |
12668 | ||
12669 | function-try-block: | |
12670 | try ctor-initializer [opt] function-body handler-seq */ | |
12671 | ||
12672 | static bool | |
12673 | cp_parser_function_try_block (parser) | |
12674 | cp_parser *parser; | |
12675 | { | |
12676 | tree try_block; | |
12677 | bool ctor_initializer_p; | |
12678 | ||
12679 | /* Look for the `try' keyword. */ | |
12680 | if (!cp_parser_require_keyword (parser, RID_TRY, "`try'")) | |
12681 | return false; | |
12682 | /* Let the rest of the front-end know where we are. */ | |
12683 | try_block = begin_function_try_block (); | |
12684 | /* Parse the function-body. */ | |
12685 | ctor_initializer_p | |
12686 | = cp_parser_ctor_initializer_opt_and_function_body (parser); | |
12687 | /* We're done with the `try' part. */ | |
12688 | finish_function_try_block (try_block); | |
12689 | /* Parse the handlers. */ | |
12690 | cp_parser_handler_seq (parser); | |
12691 | /* We're done with the handlers. */ | |
12692 | finish_function_handler_sequence (try_block); | |
12693 | ||
12694 | return ctor_initializer_p; | |
12695 | } | |
12696 | ||
12697 | /* Parse a handler-seq. | |
12698 | ||
12699 | handler-seq: | |
12700 | handler handler-seq [opt] */ | |
12701 | ||
12702 | static void | |
12703 | cp_parser_handler_seq (parser) | |
12704 | cp_parser *parser; | |
12705 | { | |
12706 | while (true) | |
12707 | { | |
12708 | cp_token *token; | |
12709 | ||
12710 | /* Parse the handler. */ | |
12711 | cp_parser_handler (parser); | |
12712 | /* Peek at the next token. */ | |
12713 | token = cp_lexer_peek_token (parser->lexer); | |
12714 | /* If it's not `catch' then there are no more handlers. */ | |
12715 | if (!cp_parser_is_keyword (token, RID_CATCH)) | |
12716 | break; | |
12717 | } | |
12718 | } | |
12719 | ||
12720 | /* Parse a handler. | |
12721 | ||
12722 | handler: | |
12723 | catch ( exception-declaration ) compound-statement */ | |
12724 | ||
12725 | static void | |
12726 | cp_parser_handler (parser) | |
12727 | cp_parser *parser; | |
12728 | { | |
12729 | tree handler; | |
12730 | tree declaration; | |
12731 | ||
12732 | cp_parser_require_keyword (parser, RID_CATCH, "`catch'"); | |
12733 | handler = begin_handler (); | |
12734 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12735 | declaration = cp_parser_exception_declaration (parser); | |
12736 | finish_handler_parms (declaration, handler); | |
12737 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12738 | cp_parser_compound_statement (parser); | |
12739 | finish_handler (handler); | |
12740 | } | |
12741 | ||
12742 | /* Parse an exception-declaration. | |
12743 | ||
12744 | exception-declaration: | |
12745 | type-specifier-seq declarator | |
12746 | type-specifier-seq abstract-declarator | |
12747 | type-specifier-seq | |
12748 | ... | |
12749 | ||
12750 | Returns a VAR_DECL for the declaration, or NULL_TREE if the | |
12751 | ellipsis variant is used. */ | |
12752 | ||
12753 | static tree | |
12754 | cp_parser_exception_declaration (parser) | |
12755 | cp_parser *parser; | |
12756 | { | |
12757 | tree type_specifiers; | |
12758 | tree declarator; | |
12759 | const char *saved_message; | |
12760 | ||
12761 | /* If it's an ellipsis, it's easy to handle. */ | |
12762 | if (cp_lexer_next_token_is (parser->lexer, CPP_ELLIPSIS)) | |
12763 | { | |
12764 | /* Consume the `...' token. */ | |
12765 | cp_lexer_consume_token (parser->lexer); | |
12766 | return NULL_TREE; | |
12767 | } | |
12768 | ||
12769 | /* Types may not be defined in exception-declarations. */ | |
12770 | saved_message = parser->type_definition_forbidden_message; | |
12771 | parser->type_definition_forbidden_message | |
12772 | = "types may not be defined in exception-declarations"; | |
12773 | ||
12774 | /* Parse the type-specifier-seq. */ | |
12775 | type_specifiers = cp_parser_type_specifier_seq (parser); | |
12776 | /* If it's a `)', then there is no declarator. */ | |
12777 | if (cp_lexer_next_token_is (parser->lexer, CPP_CLOSE_PAREN)) | |
12778 | declarator = NULL_TREE; | |
12779 | else | |
12780 | { | |
12781 | /* Otherwise, we can't be sure whether we are looking at a | |
12782 | direct, or an abstract, declarator. */ | |
12783 | cp_parser_parse_tentatively (parser); | |
12784 | /* Try an ordinary declarator. */ | |
12785 | declarator = cp_parser_declarator (parser, | |
12786 | /*abstract_p=*/false, | |
12787 | /*ctor_dtor_or_conv_p=*/NULL); | |
12788 | /* If that didn't work, try an abstract declarator. */ | |
12789 | if (!cp_parser_parse_definitely (parser)) | |
12790 | declarator = cp_parser_declarator (parser, | |
12791 | /*abstract_p=*/true, | |
12792 | /*ctor_dtor_or_conv_p=*/NULL); | |
12793 | } | |
12794 | ||
12795 | /* Restore the saved message. */ | |
12796 | parser->type_definition_forbidden_message = saved_message; | |
12797 | ||
12798 | return start_handler_parms (type_specifiers, declarator); | |
12799 | } | |
12800 | ||
12801 | /* Parse a throw-expression. | |
12802 | ||
12803 | throw-expression: | |
12804 | throw assignment-expresion [opt] | |
12805 | ||
12806 | Returns a THROW_EXPR representing the throw-expression. */ | |
12807 | ||
12808 | static tree | |
12809 | cp_parser_throw_expression (parser) | |
12810 | cp_parser *parser; | |
12811 | { | |
12812 | tree expression; | |
12813 | ||
12814 | cp_parser_require_keyword (parser, RID_THROW, "`throw'"); | |
12815 | /* We can't be sure if there is an assignment-expression or not. */ | |
12816 | cp_parser_parse_tentatively (parser); | |
12817 | /* Try it. */ | |
12818 | expression = cp_parser_assignment_expression (parser); | |
12819 | /* If it didn't work, this is just a rethrow. */ | |
12820 | if (!cp_parser_parse_definitely (parser)) | |
12821 | expression = NULL_TREE; | |
12822 | ||
12823 | return build_throw (expression); | |
12824 | } | |
12825 | ||
12826 | /* GNU Extensions */ | |
12827 | ||
12828 | /* Parse an (optional) asm-specification. | |
12829 | ||
12830 | asm-specification: | |
12831 | asm ( string-literal ) | |
12832 | ||
12833 | If the asm-specification is present, returns a STRING_CST | |
12834 | corresponding to the string-literal. Otherwise, returns | |
12835 | NULL_TREE. */ | |
12836 | ||
12837 | static tree | |
12838 | cp_parser_asm_specification_opt (parser) | |
12839 | cp_parser *parser; | |
12840 | { | |
12841 | cp_token *token; | |
12842 | tree asm_specification; | |
12843 | ||
12844 | /* Peek at the next token. */ | |
12845 | token = cp_lexer_peek_token (parser->lexer); | |
12846 | /* If the next token isn't the `asm' keyword, then there's no | |
12847 | asm-specification. */ | |
12848 | if (!cp_parser_is_keyword (token, RID_ASM)) | |
12849 | return NULL_TREE; | |
12850 | ||
12851 | /* Consume the `asm' token. */ | |
12852 | cp_lexer_consume_token (parser->lexer); | |
12853 | /* Look for the `('. */ | |
12854 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12855 | ||
12856 | /* Look for the string-literal. */ | |
12857 | token = cp_parser_require (parser, CPP_STRING, "string-literal"); | |
12858 | if (token) | |
12859 | asm_specification = token->value; | |
12860 | else | |
12861 | asm_specification = NULL_TREE; | |
12862 | ||
12863 | /* Look for the `)'. */ | |
12864 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`('"); | |
12865 | ||
12866 | return asm_specification; | |
12867 | } | |
12868 | ||
12869 | /* Parse an asm-operand-list. | |
12870 | ||
12871 | asm-operand-list: | |
12872 | asm-operand | |
12873 | asm-operand-list , asm-operand | |
12874 | ||
12875 | asm-operand: | |
12876 | string-literal ( expression ) | |
12877 | [ string-literal ] string-literal ( expression ) | |
12878 | ||
12879 | Returns a TREE_LIST representing the operands. The TREE_VALUE of | |
12880 | each node is the expression. The TREE_PURPOSE is itself a | |
12881 | TREE_LIST whose TREE_PURPOSE is a STRING_CST for the bracketed | |
12882 | string-literal (or NULL_TREE if not present) and whose TREE_VALUE | |
12883 | is a STRING_CST for the string literal before the parenthesis. */ | |
12884 | ||
12885 | static tree | |
12886 | cp_parser_asm_operand_list (parser) | |
12887 | cp_parser *parser; | |
12888 | { | |
12889 | tree asm_operands = NULL_TREE; | |
12890 | ||
12891 | while (true) | |
12892 | { | |
12893 | tree string_literal; | |
12894 | tree expression; | |
12895 | tree name; | |
12896 | cp_token *token; | |
12897 | ||
12898 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_SQUARE)) | |
12899 | { | |
12900 | /* Consume the `[' token. */ | |
12901 | cp_lexer_consume_token (parser->lexer); | |
12902 | /* Read the operand name. */ | |
12903 | name = cp_parser_identifier (parser); | |
12904 | if (name != error_mark_node) | |
12905 | name = build_string (IDENTIFIER_LENGTH (name), | |
12906 | IDENTIFIER_POINTER (name)); | |
12907 | /* Look for the closing `]'. */ | |
12908 | cp_parser_require (parser, CPP_CLOSE_SQUARE, "`]'"); | |
12909 | } | |
12910 | else | |
12911 | name = NULL_TREE; | |
12912 | /* Look for the string-literal. */ | |
12913 | token = cp_parser_require (parser, CPP_STRING, "string-literal"); | |
12914 | string_literal = token ? token->value : error_mark_node; | |
12915 | /* Look for the `('. */ | |
12916 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
12917 | /* Parse the expression. */ | |
12918 | expression = cp_parser_expression (parser); | |
12919 | /* Look for the `)'. */ | |
12920 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
12921 | /* Add this operand to the list. */ | |
12922 | asm_operands = tree_cons (build_tree_list (name, string_literal), | |
12923 | expression, | |
12924 | asm_operands); | |
12925 | /* If the next token is not a `,', there are no more | |
12926 | operands. */ | |
12927 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
12928 | break; | |
12929 | /* Consume the `,'. */ | |
12930 | cp_lexer_consume_token (parser->lexer); | |
12931 | } | |
12932 | ||
12933 | return nreverse (asm_operands); | |
12934 | } | |
12935 | ||
12936 | /* Parse an asm-clobber-list. | |
12937 | ||
12938 | asm-clobber-list: | |
12939 | string-literal | |
12940 | asm-clobber-list , string-literal | |
12941 | ||
12942 | Returns a TREE_LIST, indicating the clobbers in the order that they | |
12943 | appeared. The TREE_VALUE of each node is a STRING_CST. */ | |
12944 | ||
12945 | static tree | |
12946 | cp_parser_asm_clobber_list (parser) | |
12947 | cp_parser *parser; | |
12948 | { | |
12949 | tree clobbers = NULL_TREE; | |
12950 | ||
12951 | while (true) | |
12952 | { | |
12953 | cp_token *token; | |
12954 | tree string_literal; | |
12955 | ||
12956 | /* Look for the string literal. */ | |
12957 | token = cp_parser_require (parser, CPP_STRING, "string-literal"); | |
12958 | string_literal = token ? token->value : error_mark_node; | |
12959 | /* Add it to the list. */ | |
12960 | clobbers = tree_cons (NULL_TREE, string_literal, clobbers); | |
12961 | /* If the next token is not a `,', then the list is | |
12962 | complete. */ | |
12963 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_COMMA)) | |
12964 | break; | |
12965 | /* Consume the `,' token. */ | |
12966 | cp_lexer_consume_token (parser->lexer); | |
12967 | } | |
12968 | ||
12969 | return clobbers; | |
12970 | } | |
12971 | ||
12972 | /* Parse an (optional) series of attributes. | |
12973 | ||
12974 | attributes: | |
12975 | attributes attribute | |
12976 | ||
12977 | attribute: | |
12978 | __attribute__ (( attribute-list [opt] )) | |
12979 | ||
12980 | The return value is as for cp_parser_attribute_list. */ | |
12981 | ||
12982 | static tree | |
12983 | cp_parser_attributes_opt (parser) | |
12984 | cp_parser *parser; | |
12985 | { | |
12986 | tree attributes = NULL_TREE; | |
12987 | ||
12988 | while (true) | |
12989 | { | |
12990 | cp_token *token; | |
12991 | tree attribute_list; | |
12992 | ||
12993 | /* Peek at the next token. */ | |
12994 | token = cp_lexer_peek_token (parser->lexer); | |
12995 | /* If it's not `__attribute__', then we're done. */ | |
12996 | if (token->keyword != RID_ATTRIBUTE) | |
12997 | break; | |
12998 | ||
12999 | /* Consume the `__attribute__' keyword. */ | |
13000 | cp_lexer_consume_token (parser->lexer); | |
13001 | /* Look for the two `(' tokens. */ | |
13002 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
13003 | cp_parser_require (parser, CPP_OPEN_PAREN, "`('"); | |
13004 | ||
13005 | /* Peek at the next token. */ | |
13006 | token = cp_lexer_peek_token (parser->lexer); | |
13007 | if (token->type != CPP_CLOSE_PAREN) | |
13008 | /* Parse the attribute-list. */ | |
13009 | attribute_list = cp_parser_attribute_list (parser); | |
13010 | else | |
13011 | /* If the next token is a `)', then there is no attribute | |
13012 | list. */ | |
13013 | attribute_list = NULL; | |
13014 | ||
13015 | /* Look for the two `)' tokens. */ | |
13016 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
13017 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
13018 | ||
13019 | /* Add these new attributes to the list. */ | |
13020 | attributes = chainon (attributes, attribute_list); | |
13021 | } | |
13022 | ||
13023 | return attributes; | |
13024 | } | |
13025 | ||
13026 | /* Parse an attribute-list. | |
13027 | ||
13028 | attribute-list: | |
13029 | attribute | |
13030 | attribute-list , attribute | |
13031 | ||
13032 | attribute: | |
13033 | identifier | |
13034 | identifier ( identifier ) | |
13035 | identifier ( identifier , expression-list ) | |
13036 | identifier ( expression-list ) | |
13037 | ||
13038 | Returns a TREE_LIST. Each node corresponds to an attribute. THe | |
13039 | TREE_PURPOSE of each node is the identifier indicating which | |
13040 | attribute is in use. The TREE_VALUE represents the arguments, if | |
13041 | any. */ | |
13042 | ||
13043 | static tree | |
13044 | cp_parser_attribute_list (parser) | |
13045 | cp_parser *parser; | |
13046 | { | |
13047 | tree attribute_list = NULL_TREE; | |
13048 | ||
13049 | while (true) | |
13050 | { | |
13051 | cp_token *token; | |
13052 | tree identifier; | |
13053 | tree attribute; | |
13054 | ||
13055 | /* Look for the identifier. We also allow keywords here; for | |
13056 | example `__attribute__ ((const))' is legal. */ | |
13057 | token = cp_lexer_peek_token (parser->lexer); | |
13058 | if (token->type != CPP_NAME | |
13059 | && token->type != CPP_KEYWORD) | |
13060 | return error_mark_node; | |
13061 | /* Consume the token. */ | |
13062 | token = cp_lexer_consume_token (parser->lexer); | |
13063 | ||
13064 | /* Save away the identifier that indicates which attribute this is. */ | |
13065 | identifier = token->value; | |
13066 | attribute = build_tree_list (identifier, NULL_TREE); | |
13067 | ||
13068 | /* Peek at the next token. */ | |
13069 | token = cp_lexer_peek_token (parser->lexer); | |
13070 | /* If it's an `(', then parse the attribute arguments. */ | |
13071 | if (token->type == CPP_OPEN_PAREN) | |
13072 | { | |
13073 | tree arguments; | |
13074 | int arguments_allowed_p = 1; | |
13075 | ||
13076 | /* Consume the `('. */ | |
13077 | cp_lexer_consume_token (parser->lexer); | |
13078 | /* Peek at the next token. */ | |
13079 | token = cp_lexer_peek_token (parser->lexer); | |
13080 | /* Check to see if the next token is an identifier. */ | |
13081 | if (token->type == CPP_NAME) | |
13082 | { | |
13083 | /* Save the identifier. */ | |
13084 | identifier = token->value; | |
13085 | /* Consume the identifier. */ | |
13086 | cp_lexer_consume_token (parser->lexer); | |
13087 | /* Peek at the next token. */ | |
13088 | token = cp_lexer_peek_token (parser->lexer); | |
13089 | /* If the next token is a `,', then there are some other | |
13090 | expressions as well. */ | |
13091 | if (token->type == CPP_COMMA) | |
13092 | /* Consume the comma. */ | |
13093 | cp_lexer_consume_token (parser->lexer); | |
13094 | else | |
13095 | arguments_allowed_p = 0; | |
13096 | } | |
13097 | else | |
13098 | identifier = NULL_TREE; | |
13099 | ||
13100 | /* If there are arguments, parse them too. */ | |
13101 | if (arguments_allowed_p) | |
13102 | arguments = cp_parser_expression_list (parser); | |
13103 | else | |
13104 | arguments = NULL_TREE; | |
13105 | ||
13106 | /* Combine the identifier and the arguments. */ | |
13107 | if (identifier) | |
13108 | arguments = tree_cons (NULL_TREE, identifier, arguments); | |
13109 | ||
13110 | /* Save the identifier and arguments away. */ | |
13111 | TREE_VALUE (attribute) = arguments; | |
13112 | ||
13113 | /* Look for the closing `)'. */ | |
13114 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
13115 | } | |
13116 | ||
13117 | /* Add this attribute to the list. */ | |
13118 | TREE_CHAIN (attribute) = attribute_list; | |
13119 | attribute_list = attribute; | |
13120 | ||
13121 | /* Now, look for more attributes. */ | |
13122 | token = cp_lexer_peek_token (parser->lexer); | |
13123 | /* If the next token isn't a `,', we're done. */ | |
13124 | if (token->type != CPP_COMMA) | |
13125 | break; | |
13126 | ||
13127 | /* Consume the commma and keep going. */ | |
13128 | cp_lexer_consume_token (parser->lexer); | |
13129 | } | |
13130 | ||
13131 | /* We built up the list in reverse order. */ | |
13132 | return nreverse (attribute_list); | |
13133 | } | |
13134 | ||
13135 | /* Parse an optional `__extension__' keyword. Returns TRUE if it is | |
13136 | present, and FALSE otherwise. *SAVED_PEDANTIC is set to the | |
13137 | current value of the PEDANTIC flag, regardless of whether or not | |
13138 | the `__extension__' keyword is present. The caller is responsible | |
13139 | for restoring the value of the PEDANTIC flag. */ | |
13140 | ||
13141 | static bool | |
13142 | cp_parser_extension_opt (parser, saved_pedantic) | |
13143 | cp_parser *parser; | |
13144 | int *saved_pedantic; | |
13145 | { | |
13146 | /* Save the old value of the PEDANTIC flag. */ | |
13147 | *saved_pedantic = pedantic; | |
13148 | ||
13149 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_EXTENSION)) | |
13150 | { | |
13151 | /* Consume the `__extension__' token. */ | |
13152 | cp_lexer_consume_token (parser->lexer); | |
13153 | /* We're not being pedantic while the `__extension__' keyword is | |
13154 | in effect. */ | |
13155 | pedantic = 0; | |
13156 | ||
13157 | return true; | |
13158 | } | |
13159 | ||
13160 | return false; | |
13161 | } | |
13162 | ||
13163 | /* Parse a label declaration. | |
13164 | ||
13165 | label-declaration: | |
13166 | __label__ label-declarator-seq ; | |
13167 | ||
13168 | label-declarator-seq: | |
13169 | identifier , label-declarator-seq | |
13170 | identifier */ | |
13171 | ||
13172 | static void | |
13173 | cp_parser_label_declaration (parser) | |
13174 | cp_parser *parser; | |
13175 | { | |
13176 | /* Look for the `__label__' keyword. */ | |
13177 | cp_parser_require_keyword (parser, RID_LABEL, "`__label__'"); | |
13178 | ||
13179 | while (true) | |
13180 | { | |
13181 | tree identifier; | |
13182 | ||
13183 | /* Look for an identifier. */ | |
13184 | identifier = cp_parser_identifier (parser); | |
13185 | /* Declare it as a lobel. */ | |
13186 | finish_label_decl (identifier); | |
13187 | /* If the next token is a `;', stop. */ | |
13188 | if (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
13189 | break; | |
13190 | /* Look for the `,' separating the label declarations. */ | |
13191 | cp_parser_require (parser, CPP_COMMA, "`,'"); | |
13192 | } | |
13193 | ||
13194 | /* Look for the final `;'. */ | |
13195 | cp_parser_require (parser, CPP_SEMICOLON, "`;'"); | |
13196 | } | |
13197 | ||
13198 | /* Support Functions */ | |
13199 | ||
13200 | /* Looks up NAME in the current scope, as given by PARSER->SCOPE. | |
13201 | NAME should have one of the representations used for an | |
13202 | id-expression. If NAME is the ERROR_MARK_NODE, the ERROR_MARK_NODE | |
13203 | is returned. If PARSER->SCOPE is a dependent type, then a | |
13204 | SCOPE_REF is returned. | |
13205 | ||
13206 | If NAME is a TEMPLATE_ID_EXPR, then it will be immediately | |
13207 | returned; the name was already resolved when the TEMPLATE_ID_EXPR | |
13208 | was formed. Abstractly, such entities should not be passed to this | |
13209 | function, because they do not need to be looked up, but it is | |
13210 | simpler to check for this special case here, rather than at the | |
13211 | call-sites. | |
13212 | ||
13213 | In cases not explicitly covered above, this function returns a | |
13214 | DECL, OVERLOAD, or baselink representing the result of the lookup. | |
13215 | If there was no entity with the indicated NAME, the ERROR_MARK_NODE | |
13216 | is returned. | |
13217 | ||
13218 | If CHECK_ACCESS is TRUE, then access control is performed on the | |
13219 | declaration to which the name resolves, and an error message is | |
13220 | issued if the declaration is inaccessible. | |
13221 | ||
13222 | If IS_TYPE is TRUE, bindings that do not refer to types are | |
13223 | ignored. | |
13224 | ||
13225 | If CHECK_DEPENDENCY is TRUE, names are not looked up in dependent | |
13226 | types. */ | |
13227 | ||
13228 | static tree | |
13229 | cp_parser_lookup_name (parser, name, check_access, is_type, | |
13230 | check_dependency) | |
13231 | cp_parser *parser; | |
13232 | tree name; | |
13233 | bool check_access; | |
13234 | bool is_type; | |
13235 | bool check_dependency; | |
13236 | { | |
13237 | tree decl; | |
13238 | tree object_type = parser->context->object_type; | |
13239 | ||
13240 | /* Now that we have looked up the name, the OBJECT_TYPE (if any) is | |
13241 | no longer valid. Note that if we are parsing tentatively, and | |
13242 | the parse fails, OBJECT_TYPE will be automatically restored. */ | |
13243 | parser->context->object_type = NULL_TREE; | |
13244 | ||
13245 | if (name == error_mark_node) | |
13246 | return error_mark_node; | |
13247 | ||
13248 | /* A template-id has already been resolved; there is no lookup to | |
13249 | do. */ | |
13250 | if (TREE_CODE (name) == TEMPLATE_ID_EXPR) | |
13251 | return name; | |
13252 | if (BASELINK_P (name)) | |
13253 | { | |
13254 | my_friendly_assert ((TREE_CODE (BASELINK_FUNCTIONS (name)) | |
13255 | == TEMPLATE_ID_EXPR), | |
13256 | 20020909); | |
13257 | return name; | |
13258 | } | |
13259 | ||
13260 | /* A BIT_NOT_EXPR is used to represent a destructor. By this point, | |
13261 | it should already have been checked to make sure that the name | |
13262 | used matches the type being destroyed. */ | |
13263 | if (TREE_CODE (name) == BIT_NOT_EXPR) | |
13264 | { | |
13265 | tree type; | |
13266 | ||
13267 | /* Figure out to which type this destructor applies. */ | |
13268 | if (parser->scope) | |
13269 | type = parser->scope; | |
13270 | else if (object_type) | |
13271 | type = object_type; | |
13272 | else | |
13273 | type = current_class_type; | |
13274 | /* If that's not a class type, there is no destructor. */ | |
13275 | if (!type || !CLASS_TYPE_P (type)) | |
13276 | return error_mark_node; | |
13277 | /* If it was a class type, return the destructor. */ | |
13278 | return CLASSTYPE_DESTRUCTORS (type); | |
13279 | } | |
13280 | ||
13281 | /* By this point, the NAME should be an ordinary identifier. If | |
13282 | the id-expression was a qualified name, the qualifying scope is | |
13283 | stored in PARSER->SCOPE at this point. */ | |
13284 | my_friendly_assert (TREE_CODE (name) == IDENTIFIER_NODE, | |
13285 | 20000619); | |
13286 | ||
13287 | /* Perform the lookup. */ | |
13288 | if (parser->scope) | |
13289 | { | |
13290 | bool dependent_type_p; | |
13291 | ||
13292 | if (parser->scope == error_mark_node) | |
13293 | return error_mark_node; | |
13294 | ||
13295 | /* If the SCOPE is dependent, the lookup must be deferred until | |
13296 | the template is instantiated -- unless we are explicitly | |
13297 | looking up names in uninstantiated templates. Even then, we | |
13298 | cannot look up the name if the scope is not a class type; it | |
13299 | might, for example, be a template type parameter. */ | |
13300 | dependent_type_p = (TYPE_P (parser->scope) | |
13301 | && !(parser->in_declarator_p | |
13302 | && currently_open_class (parser->scope)) | |
13303 | && cp_parser_dependent_type_p (parser->scope)); | |
13304 | if ((check_dependency || !CLASS_TYPE_P (parser->scope)) | |
13305 | && dependent_type_p) | |
13306 | { | |
13307 | if (!is_type) | |
13308 | decl = build_nt (SCOPE_REF, parser->scope, name); | |
13309 | else | |
13310 | /* The resolution to Core Issue 180 says that `struct A::B' | |
13311 | should be considered a type-name, even if `A' is | |
13312 | dependent. */ | |
13313 | decl = TYPE_NAME (make_typename_type (parser->scope, | |
13314 | name, | |
13315 | /*complain=*/1)); | |
13316 | } | |
13317 | else | |
13318 | { | |
13319 | /* If PARSER->SCOPE is a dependent type, then it must be a | |
13320 | class type, and we must not be checking dependencies; | |
13321 | otherwise, we would have processed this lookup above. So | |
13322 | that PARSER->SCOPE is not considered a dependent base by | |
13323 | lookup_member, we must enter the scope here. */ | |
13324 | if (dependent_type_p) | |
13325 | push_scope (parser->scope); | |
13326 | /* If the PARSER->SCOPE is a a template specialization, it | |
13327 | may be instantiated during name lookup. In that case, | |
13328 | errors may be issued. Even if we rollback the current | |
13329 | tentative parse, those errors are valid. */ | |
13330 | decl = lookup_qualified_name (parser->scope, name, is_type, | |
13331 | /*flags=*/0); | |
13332 | if (dependent_type_p) | |
13333 | pop_scope (parser->scope); | |
13334 | } | |
13335 | parser->qualifying_scope = parser->scope; | |
13336 | parser->object_scope = NULL_TREE; | |
13337 | } | |
13338 | else if (object_type) | |
13339 | { | |
13340 | tree object_decl = NULL_TREE; | |
13341 | /* Look up the name in the scope of the OBJECT_TYPE, unless the | |
13342 | OBJECT_TYPE is not a class. */ | |
13343 | if (CLASS_TYPE_P (object_type)) | |
13344 | /* If the OBJECT_TYPE is a template specialization, it may | |
13345 | be instantiated during name lookup. In that case, errors | |
13346 | may be issued. Even if we rollback the current tentative | |
13347 | parse, those errors are valid. */ | |
13348 | object_decl = lookup_member (object_type, | |
13349 | name, | |
13350 | /*protect=*/0, is_type); | |
13351 | /* Look it up in the enclosing context, too. */ | |
13352 | decl = lookup_name_real (name, is_type, /*nonclass=*/0, | |
13353 | /*namespaces_only=*/0, | |
13354 | /*flags=*/0); | |
13355 | parser->object_scope = object_type; | |
13356 | parser->qualifying_scope = NULL_TREE; | |
13357 | if (object_decl) | |
13358 | decl = object_decl; | |
13359 | } | |
13360 | else | |
13361 | { | |
13362 | decl = lookup_name_real (name, is_type, /*nonclass=*/0, | |
13363 | /*namespaces_only=*/0, | |
13364 | /*flags=*/0); | |
13365 | parser->qualifying_scope = NULL_TREE; | |
13366 | parser->object_scope = NULL_TREE; | |
13367 | } | |
13368 | ||
13369 | /* If the lookup failed, let our caller know. */ | |
13370 | if (!decl | |
13371 | || decl == error_mark_node | |
13372 | || (TREE_CODE (decl) == FUNCTION_DECL | |
13373 | && DECL_ANTICIPATED (decl))) | |
13374 | return error_mark_node; | |
13375 | ||
13376 | /* If it's a TREE_LIST, the result of the lookup was ambiguous. */ | |
13377 | if (TREE_CODE (decl) == TREE_LIST) | |
13378 | { | |
13379 | /* The error message we have to print is too complicated for | |
13380 | cp_parser_error, so we incorporate its actions directly. */ | |
13381 | cp_parser_simulate_error (parser); | |
13382 | if (!cp_parser_parsing_tentatively (parser) | |
13383 | || cp_parser_committed_to_tentative_parse (parser)) | |
13384 | { | |
13385 | error ("reference to `%D' is ambiguous", name); | |
13386 | print_candidates (decl); | |
13387 | } | |
13388 | return error_mark_node; | |
13389 | } | |
13390 | ||
13391 | my_friendly_assert (DECL_P (decl) | |
13392 | || TREE_CODE (decl) == OVERLOAD | |
13393 | || TREE_CODE (decl) == SCOPE_REF | |
13394 | || BASELINK_P (decl), | |
13395 | 20000619); | |
13396 | ||
13397 | /* If we have resolved the name of a member declaration, check to | |
13398 | see if the declaration is accessible. When the name resolves to | |
13399 | set of overloaded functions, accesibility is checked when | |
13400 | overload resolution is done. | |
13401 | ||
13402 | During an explicit instantiation, access is not checked at all, | |
13403 | as per [temp.explicit]. */ | |
13404 | if (check_access && scope_chain->check_access && DECL_P (decl)) | |
13405 | { | |
13406 | tree qualifying_type; | |
13407 | ||
13408 | /* Figure out the type through which DECL is being | |
13409 | accessed. */ | |
13410 | qualifying_type | |
13411 | = cp_parser_scope_through_which_access_occurs (decl, | |
13412 | object_type, | |
13413 | parser->scope); | |
13414 | if (qualifying_type) | |
13415 | { | |
13416 | /* If we are supposed to defer access checks, just record | |
13417 | the information for later. */ | |
13418 | if (parser->context->deferring_access_checks_p) | |
13419 | cp_parser_defer_access_check (parser, qualifying_type, decl); | |
13420 | /* Otherwise, check accessibility now. */ | |
13421 | else | |
13422 | enforce_access (qualifying_type, decl); | |
13423 | } | |
13424 | } | |
13425 | ||
13426 | return decl; | |
13427 | } | |
13428 | ||
13429 | /* Like cp_parser_lookup_name, but for use in the typical case where | |
13430 | CHECK_ACCESS is TRUE, IS_TYPE is FALSE, and CHECK_DEPENDENCY is | |
13431 | TRUE. */ | |
13432 | ||
13433 | static tree | |
13434 | cp_parser_lookup_name_simple (parser, name) | |
13435 | cp_parser *parser; | |
13436 | tree name; | |
13437 | { | |
13438 | return cp_parser_lookup_name (parser, name, | |
13439 | /*check_access=*/true, | |
13440 | /*is_type=*/false, | |
13441 | /*check_dependency=*/true); | |
13442 | } | |
13443 | ||
13444 | /* TYPE is a TYPENAME_TYPE. Returns the ordinary TYPE to which the | |
13445 | TYPENAME_TYPE corresponds. Note that this function peers inside | |
13446 | uninstantiated templates and therefore should be used only in | |
13447 | extremely limited situations. */ | |
13448 | ||
13449 | static tree | |
13450 | cp_parser_resolve_typename_type (parser, type) | |
13451 | cp_parser *parser; | |
13452 | tree type; | |
13453 | { | |
13454 | tree scope; | |
13455 | tree name; | |
13456 | tree decl; | |
13457 | ||
13458 | my_friendly_assert (TREE_CODE (type) == TYPENAME_TYPE, | |
13459 | 20010702); | |
13460 | ||
13461 | scope = TYPE_CONTEXT (type); | |
13462 | name = DECL_NAME (TYPE_NAME (type)); | |
13463 | ||
13464 | /* If the SCOPE is itself a TYPENAME_TYPE, then we need to resolve | |
13465 | it first before we can figure out what NAME refers to. */ | |
13466 | if (TREE_CODE (scope) == TYPENAME_TYPE) | |
13467 | scope = cp_parser_resolve_typename_type (parser, scope); | |
13468 | /* If we don't know what SCOPE refers to, then we cannot resolve the | |
13469 | TYPENAME_TYPE. */ | |
13470 | if (scope == error_mark_node) | |
13471 | return error_mark_node; | |
13472 | /* If the SCOPE is a template type parameter, we have no way of | |
13473 | resolving the name. */ | |
13474 | if (TREE_CODE (scope) == TEMPLATE_TYPE_PARM) | |
13475 | return type; | |
13476 | /* Enter the SCOPE so that name lookup will be resolved as if we | |
13477 | were in the class definition. In particular, SCOPE will no | |
13478 | longer be considered a dependent type. */ | |
13479 | push_scope (scope); | |
13480 | /* Look up the declaration. */ | |
13481 | decl = lookup_member (scope, name, /*protect=*/0, /*want_type=*/1); | |
13482 | /* If all went well, we got a TYPE_DECL for a non-typename. */ | |
13483 | if (!decl | |
13484 | || TREE_CODE (decl) != TYPE_DECL | |
13485 | || TREE_CODE (TREE_TYPE (decl)) == TYPENAME_TYPE) | |
13486 | { | |
13487 | cp_parser_error (parser, "could not resolve typename type"); | |
13488 | type = error_mark_node; | |
13489 | } | |
13490 | else | |
13491 | type = TREE_TYPE (decl); | |
13492 | /* Leave the SCOPE. */ | |
13493 | pop_scope (scope); | |
13494 | ||
13495 | return type; | |
13496 | } | |
13497 | ||
13498 | /* If DECL is a TEMPLATE_DECL that can be treated like a TYPE_DECL in | |
13499 | the current context, return the TYPE_DECL. If TAG_NAME_P is | |
13500 | true, the DECL indicates the class being defined in a class-head, | |
13501 | or declared in an elaborated-type-specifier. | |
13502 | ||
13503 | Otherwise, return DECL. */ | |
13504 | ||
13505 | static tree | |
13506 | cp_parser_maybe_treat_template_as_class (tree decl, bool tag_name_p) | |
13507 | { | |
13508 | /* If the DECL is a TEMPLATE_DECL for a class type, and we are in | |
13509 | the scope of the class, then treat the TEMPLATE_DECL as a | |
13510 | class-name. For example, in: | |
13511 | ||
13512 | template <class T> struct S { | |
13513 | S s; | |
13514 | }; | |
13515 | ||
13516 | is OK. | |
13517 | ||
13518 | If the TEMPLATE_DECL is being declared as part of a class-head, | |
13519 | the same translation occurs: | |
13520 | ||
13521 | struct A { | |
13522 | template <typename T> struct B; | |
13523 | }; | |
13524 | ||
13525 | template <typename T> struct A::B {}; | |
13526 | ||
13527 | Similarly, in a elaborated-type-specifier: | |
13528 | ||
13529 | namespace N { struct X{}; } | |
13530 | ||
13531 | struct A { | |
13532 | template <typename T> friend struct N::X; | |
13533 | }; | |
13534 | ||
13535 | */ | |
13536 | if (DECL_CLASS_TEMPLATE_P (decl) | |
13537 | && (tag_name_p | |
13538 | || (current_class_type | |
13539 | && same_type_p (TREE_TYPE (DECL_TEMPLATE_RESULT (decl)), | |
13540 | current_class_type)))) | |
13541 | return DECL_TEMPLATE_RESULT (decl); | |
13542 | ||
13543 | return decl; | |
13544 | } | |
13545 | ||
13546 | /* If too many, or too few, template-parameter lists apply to the | |
13547 | declarator, issue an error message. Returns TRUE if all went well, | |
13548 | and FALSE otherwise. */ | |
13549 | ||
13550 | static bool | |
13551 | cp_parser_check_declarator_template_parameters (parser, declarator) | |
13552 | cp_parser *parser; | |
13553 | tree declarator; | |
13554 | { | |
13555 | unsigned num_templates; | |
13556 | ||
13557 | /* We haven't seen any classes that involve template parameters yet. */ | |
13558 | num_templates = 0; | |
13559 | ||
13560 | switch (TREE_CODE (declarator)) | |
13561 | { | |
13562 | case CALL_EXPR: | |
13563 | case ARRAY_REF: | |
13564 | case INDIRECT_REF: | |
13565 | case ADDR_EXPR: | |
13566 | { | |
13567 | tree main_declarator = TREE_OPERAND (declarator, 0); | |
13568 | return | |
13569 | cp_parser_check_declarator_template_parameters (parser, | |
13570 | main_declarator); | |
13571 | } | |
13572 | ||
13573 | case SCOPE_REF: | |
13574 | { | |
13575 | tree scope; | |
13576 | tree member; | |
13577 | ||
13578 | scope = TREE_OPERAND (declarator, 0); | |
13579 | member = TREE_OPERAND (declarator, 1); | |
13580 | ||
13581 | /* If this is a pointer-to-member, then we are not interested | |
13582 | in the SCOPE, because it does not qualify the thing that is | |
13583 | being declared. */ | |
13584 | if (TREE_CODE (member) == INDIRECT_REF) | |
13585 | return (cp_parser_check_declarator_template_parameters | |
13586 | (parser, member)); | |
13587 | ||
13588 | while (scope && CLASS_TYPE_P (scope)) | |
13589 | { | |
13590 | /* You're supposed to have one `template <...>' | |
13591 | for every template class, but you don't need one | |
13592 | for a full specialization. For example: | |
13593 | ||
13594 | template <class T> struct S{}; | |
13595 | template <> struct S<int> { void f(); }; | |
13596 | void S<int>::f () {} | |
13597 | ||
13598 | is correct; there shouldn't be a `template <>' for | |
13599 | the definition of `S<int>::f'. */ | |
13600 | if (CLASSTYPE_TEMPLATE_INFO (scope) | |
13601 | && (CLASSTYPE_TEMPLATE_INSTANTIATION (scope) | |
13602 | || uses_template_parms (CLASSTYPE_TI_ARGS (scope))) | |
13603 | && PRIMARY_TEMPLATE_P (CLASSTYPE_TI_TEMPLATE (scope))) | |
13604 | ++num_templates; | |
13605 | ||
13606 | scope = TYPE_CONTEXT (scope); | |
13607 | } | |
13608 | } | |
13609 | ||
13610 | /* Fall through. */ | |
13611 | ||
13612 | default: | |
13613 | /* If the DECLARATOR has the form `X<y>' then it uses one | |
13614 | additional level of template parameters. */ | |
13615 | if (TREE_CODE (declarator) == TEMPLATE_ID_EXPR) | |
13616 | ++num_templates; | |
13617 | ||
13618 | return cp_parser_check_template_parameters (parser, | |
13619 | num_templates); | |
13620 | } | |
13621 | } | |
13622 | ||
13623 | /* NUM_TEMPLATES were used in the current declaration. If that is | |
13624 | invalid, return FALSE and issue an error messages. Otherwise, | |
13625 | return TRUE. */ | |
13626 | ||
13627 | static bool | |
13628 | cp_parser_check_template_parameters (parser, num_templates) | |
13629 | cp_parser *parser; | |
13630 | unsigned num_templates; | |
13631 | { | |
13632 | /* If there are more template classes than parameter lists, we have | |
13633 | something like: | |
13634 | ||
13635 | template <class T> void S<T>::R<T>::f (); */ | |
13636 | if (parser->num_template_parameter_lists < num_templates) | |
13637 | { | |
13638 | error ("too few template-parameter-lists"); | |
13639 | return false; | |
13640 | } | |
13641 | /* If there are the same number of template classes and parameter | |
13642 | lists, that's OK. */ | |
13643 | if (parser->num_template_parameter_lists == num_templates) | |
13644 | return true; | |
13645 | /* If there are more, but only one more, then we are referring to a | |
13646 | member template. That's OK too. */ | |
13647 | if (parser->num_template_parameter_lists == num_templates + 1) | |
13648 | return true; | |
13649 | /* Otherwise, there are too many template parameter lists. We have | |
13650 | something like: | |
13651 | ||
13652 | template <class T> template <class U> void S::f(); */ | |
13653 | error ("too many template-parameter-lists"); | |
13654 | return false; | |
13655 | } | |
13656 | ||
13657 | /* Parse a binary-expression of the general form: | |
13658 | ||
13659 | binary-expression: | |
13660 | <expr> | |
13661 | binary-expression <token> <expr> | |
13662 | ||
13663 | The TOKEN_TREE_MAP maps <token> types to <expr> codes. FN is used | |
13664 | to parser the <expr>s. If the first production is used, then the | |
13665 | value returned by FN is returned directly. Otherwise, a node with | |
13666 | the indicated EXPR_TYPE is returned, with operands corresponding to | |
13667 | the two sub-expressions. */ | |
13668 | ||
13669 | static tree | |
13670 | cp_parser_binary_expression (parser, token_tree_map, fn) | |
13671 | cp_parser *parser; | |
13672 | cp_parser_token_tree_map token_tree_map; | |
13673 | cp_parser_expression_fn fn; | |
13674 | { | |
13675 | tree lhs; | |
13676 | ||
13677 | /* Parse the first expression. */ | |
13678 | lhs = (*fn) (parser); | |
13679 | /* Now, look for more expressions. */ | |
13680 | while (true) | |
13681 | { | |
13682 | cp_token *token; | |
13683 | cp_parser_token_tree_map_node *map_node; | |
13684 | tree rhs; | |
13685 | ||
13686 | /* Peek at the next token. */ | |
13687 | token = cp_lexer_peek_token (parser->lexer); | |
13688 | /* If the token is `>', and that's not an operator at the | |
13689 | moment, then we're done. */ | |
13690 | if (token->type == CPP_GREATER | |
13691 | && !parser->greater_than_is_operator_p) | |
13692 | break; | |
13693 | /* If we find one of the tokens we want, build the correspoding | |
13694 | tree representation. */ | |
13695 | for (map_node = token_tree_map; | |
13696 | map_node->token_type != CPP_EOF; | |
13697 | ++map_node) | |
13698 | if (map_node->token_type == token->type) | |
13699 | { | |
13700 | /* Consume the operator token. */ | |
13701 | cp_lexer_consume_token (parser->lexer); | |
13702 | /* Parse the right-hand side of the expression. */ | |
13703 | rhs = (*fn) (parser); | |
13704 | /* Build the binary tree node. */ | |
13705 | lhs = build_x_binary_op (map_node->tree_type, lhs, rhs); | |
13706 | break; | |
13707 | } | |
13708 | ||
13709 | /* If the token wasn't one of the ones we want, we're done. */ | |
13710 | if (map_node->token_type == CPP_EOF) | |
13711 | break; | |
13712 | } | |
13713 | ||
13714 | return lhs; | |
13715 | } | |
13716 | ||
13717 | /* Parse an optional `::' token indicating that the following name is | |
13718 | from the global namespace. If so, PARSER->SCOPE is set to the | |
13719 | GLOBAL_NAMESPACE. Otherwise, PARSER->SCOPE is set to NULL_TREE, | |
13720 | unless CURRENT_SCOPE_VALID_P is TRUE, in which case it is left alone. | |
13721 | Returns the new value of PARSER->SCOPE, if the `::' token is | |
13722 | present, and NULL_TREE otherwise. */ | |
13723 | ||
13724 | static tree | |
13725 | cp_parser_global_scope_opt (parser, current_scope_valid_p) | |
13726 | cp_parser *parser; | |
13727 | bool current_scope_valid_p; | |
13728 | { | |
13729 | cp_token *token; | |
13730 | ||
13731 | /* Peek at the next token. */ | |
13732 | token = cp_lexer_peek_token (parser->lexer); | |
13733 | /* If we're looking at a `::' token then we're starting from the | |
13734 | global namespace, not our current location. */ | |
13735 | if (token->type == CPP_SCOPE) | |
13736 | { | |
13737 | /* Consume the `::' token. */ | |
13738 | cp_lexer_consume_token (parser->lexer); | |
13739 | /* Set the SCOPE so that we know where to start the lookup. */ | |
13740 | parser->scope = global_namespace; | |
13741 | parser->qualifying_scope = global_namespace; | |
13742 | parser->object_scope = NULL_TREE; | |
13743 | ||
13744 | return parser->scope; | |
13745 | } | |
13746 | else if (!current_scope_valid_p) | |
13747 | { | |
13748 | parser->scope = NULL_TREE; | |
13749 | parser->qualifying_scope = NULL_TREE; | |
13750 | parser->object_scope = NULL_TREE; | |
13751 | } | |
13752 | ||
13753 | return NULL_TREE; | |
13754 | } | |
13755 | ||
13756 | /* Returns TRUE if the upcoming token sequence is the start of a | |
13757 | constructor declarator. If FRIEND_P is true, the declarator is | |
13758 | preceded by the `friend' specifier. */ | |
13759 | ||
13760 | static bool | |
13761 | cp_parser_constructor_declarator_p (cp_parser *parser, bool friend_p) | |
13762 | { | |
13763 | bool constructor_p; | |
13764 | tree type_decl = NULL_TREE; | |
13765 | bool nested_name_p; | |
13766 | ||
13767 | /* Parse tentatively; we are going to roll back all of the tokens | |
13768 | consumed here. */ | |
13769 | cp_parser_parse_tentatively (parser); | |
13770 | /* Assume that we are looking at a constructor declarator. */ | |
13771 | constructor_p = true; | |
13772 | /* Look for the optional `::' operator. */ | |
13773 | cp_parser_global_scope_opt (parser, | |
13774 | /*current_scope_valid_p=*/false); | |
13775 | /* Look for the nested-name-specifier. */ | |
13776 | nested_name_p | |
13777 | = (cp_parser_nested_name_specifier_opt (parser, | |
13778 | /*typename_keyword_p=*/false, | |
13779 | /*check_dependency_p=*/false, | |
13780 | /*type_p=*/false) | |
13781 | != NULL_TREE); | |
13782 | /* Outside of a class-specifier, there must be a | |
13783 | nested-name-specifier. */ | |
13784 | if (!nested_name_p && | |
13785 | (!at_class_scope_p () || !TYPE_BEING_DEFINED (current_class_type) | |
13786 | || friend_p)) | |
13787 | constructor_p = false; | |
13788 | /* If we still think that this might be a constructor-declarator, | |
13789 | look for a class-name. */ | |
13790 | if (constructor_p) | |
13791 | { | |
13792 | /* If we have: | |
13793 | ||
13794 | template <typename T> struct S { S(); } | |
13795 | template <typename T> S<T>::S (); | |
13796 | ||
13797 | we must recognize that the nested `S' names a class. | |
13798 | Similarly, for: | |
13799 | ||
13800 | template <typename T> S<T>::S<T> (); | |
13801 | ||
13802 | we must recognize that the nested `S' names a template. */ | |
13803 | type_decl = cp_parser_class_name (parser, | |
13804 | /*typename_keyword_p=*/false, | |
13805 | /*template_keyword_p=*/false, | |
13806 | /*type_p=*/false, | |
13807 | /*check_access_p=*/false, | |
13808 | /*check_dependency_p=*/false, | |
13809 | /*class_head_p=*/false); | |
13810 | /* If there was no class-name, then this is not a constructor. */ | |
13811 | constructor_p = !cp_parser_error_occurred (parser); | |
13812 | } | |
13813 | /* If we're still considering a constructor, we have to see a `(', | |
13814 | to begin the parameter-declaration-clause, followed by either a | |
13815 | `)', an `...', or a decl-specifier. We need to check for a | |
13816 | type-specifier to avoid being fooled into thinking that: | |
13817 | ||
13818 | S::S (f) (int); | |
13819 | ||
13820 | is a constructor. (It is actually a function named `f' that | |
13821 | takes one parameter (of type `int') and returns a value of type | |
13822 | `S::S'. */ | |
13823 | if (constructor_p | |
13824 | && cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) | |
13825 | { | |
13826 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_PAREN) | |
13827 | && cp_lexer_next_token_is_not (parser->lexer, CPP_ELLIPSIS) | |
13828 | && !cp_parser_storage_class_specifier_opt (parser)) | |
13829 | { | |
13830 | if (current_class_type | |
13831 | && !same_type_p (current_class_type, TREE_TYPE (type_decl))) | |
13832 | /* The constructor for one class cannot be declared inside | |
13833 | another. */ | |
13834 | constructor_p = false; | |
13835 | else | |
13836 | { | |
13837 | tree type; | |
13838 | ||
13839 | /* Names appearing in the type-specifier should be looked up | |
13840 | in the scope of the class. */ | |
13841 | if (current_class_type) | |
13842 | type = NULL_TREE; | |
13843 | else | |
13844 | { | |
13845 | type = TREE_TYPE (type_decl); | |
13846 | if (TREE_CODE (type) == TYPENAME_TYPE) | |
13847 | type = cp_parser_resolve_typename_type (parser, type); | |
13848 | push_scope (type); | |
13849 | } | |
13850 | /* Look for the type-specifier. */ | |
13851 | cp_parser_type_specifier (parser, | |
13852 | CP_PARSER_FLAGS_NONE, | |
13853 | /*is_friend=*/false, | |
13854 | /*is_declarator=*/true, | |
13855 | /*declares_class_or_enum=*/NULL, | |
13856 | /*is_cv_qualifier=*/NULL); | |
13857 | /* Leave the scope of the class. */ | |
13858 | if (type) | |
13859 | pop_scope (type); | |
13860 | ||
13861 | constructor_p = !cp_parser_error_occurred (parser); | |
13862 | } | |
13863 | } | |
13864 | } | |
13865 | else | |
13866 | constructor_p = false; | |
13867 | /* We did not really want to consume any tokens. */ | |
13868 | cp_parser_abort_tentative_parse (parser); | |
13869 | ||
13870 | return constructor_p; | |
13871 | } | |
13872 | ||
13873 | /* Parse the definition of the function given by the DECL_SPECIFIERS, | |
13874 | ATTRIBUTES, and DECLARATOR. The ACCESS_CHECKS have been deferred; | |
13875 | they must be performed once we are in the scope of the function. | |
13876 | ||
13877 | Returns the function defined. */ | |
13878 | ||
13879 | static tree | |
13880 | cp_parser_function_definition_from_specifiers_and_declarator | |
13881 | (parser, decl_specifiers, attributes, declarator, access_checks) | |
13882 | cp_parser *parser; | |
13883 | tree decl_specifiers; | |
13884 | tree attributes; | |
13885 | tree declarator; | |
13886 | tree access_checks; | |
13887 | { | |
13888 | tree fn; | |
13889 | bool success_p; | |
13890 | ||
13891 | /* Begin the function-definition. */ | |
13892 | success_p = begin_function_definition (decl_specifiers, | |
13893 | attributes, | |
13894 | declarator); | |
13895 | ||
13896 | /* If there were names looked up in the decl-specifier-seq that we | |
13897 | did not check, check them now. We must wait until we are in the | |
13898 | scope of the function to perform the checks, since the function | |
13899 | might be a friend. */ | |
13900 | cp_parser_perform_deferred_access_checks (access_checks); | |
13901 | ||
13902 | if (!success_p) | |
13903 | { | |
13904 | /* If begin_function_definition didn't like the definition, skip | |
13905 | the entire function. */ | |
13906 | error ("invalid function declaration"); | |
13907 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
13908 | fn = error_mark_node; | |
13909 | } | |
13910 | else | |
13911 | fn = cp_parser_function_definition_after_declarator (parser, | |
13912 | /*inline_p=*/false); | |
13913 | ||
13914 | return fn; | |
13915 | } | |
13916 | ||
13917 | /* Parse the part of a function-definition that follows the | |
13918 | declarator. INLINE_P is TRUE iff this function is an inline | |
13919 | function defined with a class-specifier. | |
13920 | ||
13921 | Returns the function defined. */ | |
13922 | ||
13923 | static tree | |
13924 | cp_parser_function_definition_after_declarator (parser, | |
13925 | inline_p) | |
13926 | cp_parser *parser; | |
13927 | bool inline_p; | |
13928 | { | |
13929 | tree fn; | |
13930 | bool ctor_initializer_p = false; | |
13931 | bool saved_in_unbraced_linkage_specification_p; | |
13932 | unsigned saved_num_template_parameter_lists; | |
13933 | ||
13934 | /* If the next token is `return', then the code may be trying to | |
13935 | make use of the "named return value" extension that G++ used to | |
13936 | support. */ | |
13937 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_RETURN)) | |
13938 | { | |
13939 | /* Consume the `return' keyword. */ | |
13940 | cp_lexer_consume_token (parser->lexer); | |
13941 | /* Look for the identifier that indicates what value is to be | |
13942 | returned. */ | |
13943 | cp_parser_identifier (parser); | |
13944 | /* Issue an error message. */ | |
13945 | error ("named return values are no longer supported"); | |
13946 | /* Skip tokens until we reach the start of the function body. */ | |
13947 | while (cp_lexer_next_token_is_not (parser->lexer, CPP_OPEN_BRACE)) | |
13948 | cp_lexer_consume_token (parser->lexer); | |
13949 | } | |
13950 | /* The `extern' in `extern "C" void f () { ... }' does not apply to | |
13951 | anything declared inside `f'. */ | |
13952 | saved_in_unbraced_linkage_specification_p | |
13953 | = parser->in_unbraced_linkage_specification_p; | |
13954 | parser->in_unbraced_linkage_specification_p = false; | |
13955 | /* Inside the function, surrounding template-parameter-lists do not | |
13956 | apply. */ | |
13957 | saved_num_template_parameter_lists | |
13958 | = parser->num_template_parameter_lists; | |
13959 | parser->num_template_parameter_lists = 0; | |
13960 | /* If the next token is `try', then we are looking at a | |
13961 | function-try-block. */ | |
13962 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TRY)) | |
13963 | ctor_initializer_p = cp_parser_function_try_block (parser); | |
13964 | /* A function-try-block includes the function-body, so we only do | |
13965 | this next part if we're not processing a function-try-block. */ | |
13966 | else | |
13967 | ctor_initializer_p | |
13968 | = cp_parser_ctor_initializer_opt_and_function_body (parser); | |
13969 | ||
13970 | /* Finish the function. */ | |
13971 | fn = finish_function ((ctor_initializer_p ? 1 : 0) | | |
13972 | (inline_p ? 2 : 0)); | |
13973 | /* Generate code for it, if necessary. */ | |
13974 | expand_body (fn); | |
13975 | /* Restore the saved values. */ | |
13976 | parser->in_unbraced_linkage_specification_p | |
13977 | = saved_in_unbraced_linkage_specification_p; | |
13978 | parser->num_template_parameter_lists | |
13979 | = saved_num_template_parameter_lists; | |
13980 | ||
13981 | return fn; | |
13982 | } | |
13983 | ||
13984 | /* Parse a template-declaration, assuming that the `export' (and | |
13985 | `extern') keywords, if present, has already been scanned. MEMBER_P | |
13986 | is as for cp_parser_template_declaration. */ | |
13987 | ||
13988 | static void | |
13989 | cp_parser_template_declaration_after_export (parser, member_p) | |
13990 | cp_parser *parser; | |
13991 | bool member_p; | |
13992 | { | |
13993 | tree decl = NULL_TREE; | |
13994 | tree parameter_list; | |
13995 | bool friend_p = false; | |
13996 | ||
13997 | /* Look for the `template' keyword. */ | |
13998 | if (!cp_parser_require_keyword (parser, RID_TEMPLATE, "`template'")) | |
13999 | return; | |
14000 | ||
14001 | /* And the `<'. */ | |
14002 | if (!cp_parser_require (parser, CPP_LESS, "`<'")) | |
14003 | return; | |
14004 | ||
14005 | /* Parse the template parameters. */ | |
14006 | begin_template_parm_list (); | |
14007 | /* If the next token is `>', then we have an invalid | |
14008 | specialization. Rather than complain about an invalid template | |
14009 | parameter, issue an error message here. */ | |
14010 | if (cp_lexer_next_token_is (parser->lexer, CPP_GREATER)) | |
14011 | { | |
14012 | cp_parser_error (parser, "invalid explicit specialization"); | |
14013 | parameter_list = NULL_TREE; | |
14014 | } | |
14015 | else | |
14016 | parameter_list = cp_parser_template_parameter_list (parser); | |
14017 | parameter_list = end_template_parm_list (parameter_list); | |
14018 | /* Look for the `>'. */ | |
14019 | cp_parser_skip_until_found (parser, CPP_GREATER, "`>'"); | |
14020 | /* We just processed one more parameter list. */ | |
14021 | ++parser->num_template_parameter_lists; | |
14022 | /* If the next token is `template', there are more template | |
14023 | parameters. */ | |
14024 | if (cp_lexer_next_token_is_keyword (parser->lexer, | |
14025 | RID_TEMPLATE)) | |
14026 | cp_parser_template_declaration_after_export (parser, member_p); | |
14027 | else | |
14028 | { | |
14029 | decl = cp_parser_single_declaration (parser, | |
14030 | member_p, | |
14031 | &friend_p); | |
14032 | ||
14033 | /* If this is a member template declaration, let the front | |
14034 | end know. */ | |
14035 | if (member_p && !friend_p && decl) | |
14036 | decl = finish_member_template_decl (decl); | |
14037 | else if (friend_p && decl && TREE_CODE (decl) == TYPE_DECL) | |
14038 | make_friend_class (current_class_type, TREE_TYPE (decl)); | |
14039 | } | |
14040 | /* We are done with the current parameter list. */ | |
14041 | --parser->num_template_parameter_lists; | |
14042 | ||
14043 | /* Finish up. */ | |
14044 | finish_template_decl (parameter_list); | |
14045 | ||
14046 | /* Register member declarations. */ | |
14047 | if (member_p && !friend_p && decl && !DECL_CLASS_TEMPLATE_P (decl)) | |
14048 | finish_member_declaration (decl); | |
14049 | ||
14050 | /* If DECL is a function template, we must return to parse it later. | |
14051 | (Even though there is no definition, there might be default | |
14052 | arguments that need handling.) */ | |
14053 | if (member_p && decl | |
14054 | && (TREE_CODE (decl) == FUNCTION_DECL | |
14055 | || DECL_FUNCTION_TEMPLATE_P (decl))) | |
14056 | TREE_VALUE (parser->unparsed_functions_queues) | |
14057 | = tree_cons (current_class_type, decl, | |
14058 | TREE_VALUE (parser->unparsed_functions_queues)); | |
14059 | } | |
14060 | ||
14061 | /* Parse a `decl-specifier-seq [opt] init-declarator [opt] ;' or | |
14062 | `function-definition' sequence. MEMBER_P is true, this declaration | |
14063 | appears in a class scope. | |
14064 | ||
14065 | Returns the DECL for the declared entity. If FRIEND_P is non-NULL, | |
14066 | *FRIEND_P is set to TRUE iff the declaration is a friend. */ | |
14067 | ||
14068 | static tree | |
14069 | cp_parser_single_declaration (parser, | |
14070 | member_p, | |
14071 | friend_p) | |
14072 | cp_parser *parser; | |
14073 | bool member_p; | |
14074 | bool *friend_p; | |
14075 | { | |
14076 | bool declares_class_or_enum; | |
14077 | tree decl = NULL_TREE; | |
14078 | tree decl_specifiers; | |
14079 | tree attributes; | |
14080 | tree access_checks; | |
14081 | ||
14082 | /* Parse the dependent declaration. We don't know yet | |
14083 | whether it will be a function-definition. */ | |
14084 | cp_parser_parse_tentatively (parser); | |
14085 | /* Defer access checks until we know what is being declared. */ | |
14086 | cp_parser_start_deferring_access_checks (parser); | |
14087 | /* Try the `decl-specifier-seq [opt] init-declarator [opt]' | |
14088 | alternative. */ | |
14089 | decl_specifiers | |
14090 | = cp_parser_decl_specifier_seq (parser, | |
14091 | CP_PARSER_FLAGS_OPTIONAL, | |
14092 | &attributes, | |
14093 | &declares_class_or_enum); | |
14094 | /* Gather up the access checks that occurred the | |
14095 | decl-specifier-seq. */ | |
14096 | access_checks = cp_parser_stop_deferring_access_checks (parser); | |
14097 | /* Check for the declaration of a template class. */ | |
14098 | if (declares_class_or_enum) | |
14099 | { | |
14100 | if (cp_parser_declares_only_class_p (parser)) | |
14101 | { | |
14102 | decl = shadow_tag (decl_specifiers); | |
14103 | if (decl) | |
14104 | decl = TYPE_NAME (decl); | |
14105 | else | |
14106 | decl = error_mark_node; | |
14107 | } | |
14108 | } | |
14109 | else | |
14110 | decl = NULL_TREE; | |
14111 | /* If it's not a template class, try for a template function. If | |
14112 | the next token is a `;', then this declaration does not declare | |
14113 | anything. But, if there were errors in the decl-specifiers, then | |
14114 | the error might well have come from an attempted class-specifier. | |
14115 | In that case, there's no need to warn about a missing declarator. */ | |
14116 | if (!decl | |
14117 | && (cp_lexer_next_token_is_not (parser->lexer, CPP_SEMICOLON) | |
14118 | || !value_member (error_mark_node, decl_specifiers))) | |
14119 | decl = cp_parser_init_declarator (parser, | |
14120 | decl_specifiers, | |
14121 | attributes, | |
14122 | access_checks, | |
14123 | /*function_definition_allowed_p=*/false, | |
14124 | member_p, | |
14125 | /*function_definition_p=*/NULL); | |
14126 | /* Clear any current qualification; whatever comes next is the start | |
14127 | of something new. */ | |
14128 | parser->scope = NULL_TREE; | |
14129 | parser->qualifying_scope = NULL_TREE; | |
14130 | parser->object_scope = NULL_TREE; | |
14131 | /* Look for a trailing `;' after the declaration. */ | |
14132 | if (!cp_parser_require (parser, CPP_SEMICOLON, "expected `;'") | |
14133 | && cp_parser_committed_to_tentative_parse (parser)) | |
14134 | cp_parser_skip_to_end_of_block_or_statement (parser); | |
14135 | /* If it worked, set *FRIEND_P based on the DECL_SPECIFIERS. */ | |
14136 | if (cp_parser_parse_definitely (parser)) | |
14137 | { | |
14138 | if (friend_p) | |
14139 | *friend_p = cp_parser_friend_p (decl_specifiers); | |
14140 | } | |
14141 | /* Otherwise, try a function-definition. */ | |
14142 | else | |
14143 | decl = cp_parser_function_definition (parser, friend_p); | |
14144 | ||
14145 | return decl; | |
14146 | } | |
14147 | ||
14148 | /* Parse a functional cast to TYPE. Returns an expression | |
14149 | representing the cast. */ | |
14150 | ||
14151 | static tree | |
14152 | cp_parser_functional_cast (parser, type) | |
14153 | cp_parser *parser; | |
14154 | tree type; | |
14155 | { | |
14156 | tree expression_list; | |
14157 | ||
14158 | /* Look for the opening `('. */ | |
14159 | if (!cp_parser_require (parser, CPP_OPEN_PAREN, "`('")) | |
14160 | return error_mark_node; | |
14161 | /* If the next token is not an `)', there are arguments to the | |
14162 | cast. */ | |
14163 | if (cp_lexer_next_token_is_not (parser->lexer, CPP_CLOSE_PAREN)) | |
14164 | expression_list = cp_parser_expression_list (parser); | |
14165 | else | |
14166 | expression_list = NULL_TREE; | |
14167 | /* Look for the closing `)'. */ | |
14168 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
14169 | ||
14170 | return build_functional_cast (type, expression_list); | |
14171 | } | |
14172 | ||
14173 | /* MEMBER_FUNCTION is a member function, or a friend. If default | |
14174 | arguments, or the body of the function have not yet been parsed, | |
14175 | parse them now. */ | |
14176 | ||
14177 | static void | |
14178 | cp_parser_late_parsing_for_member (parser, member_function) | |
14179 | cp_parser *parser; | |
14180 | tree member_function; | |
14181 | { | |
14182 | cp_lexer *saved_lexer; | |
14183 | ||
14184 | /* If this member is a template, get the underlying | |
14185 | FUNCTION_DECL. */ | |
14186 | if (DECL_FUNCTION_TEMPLATE_P (member_function)) | |
14187 | member_function = DECL_TEMPLATE_RESULT (member_function); | |
14188 | ||
14189 | /* There should not be any class definitions in progress at this | |
14190 | point; the bodies of members are only parsed outside of all class | |
14191 | definitions. */ | |
14192 | my_friendly_assert (parser->num_classes_being_defined == 0, 20010816); | |
14193 | /* While we're parsing the member functions we might encounter more | |
14194 | classes. We want to handle them right away, but we don't want | |
14195 | them getting mixed up with functions that are currently in the | |
14196 | queue. */ | |
14197 | parser->unparsed_functions_queues | |
14198 | = tree_cons (NULL_TREE, NULL_TREE, parser->unparsed_functions_queues); | |
14199 | ||
14200 | /* Make sure that any template parameters are in scope. */ | |
14201 | maybe_begin_member_template_processing (member_function); | |
14202 | ||
14203 | /* If there are default arguments that have not yet been processed, | |
14204 | take care of them now. */ | |
14205 | if (DECL_FUNCTION_MEMBER_P (member_function)) | |
14206 | push_nested_class (DECL_CONTEXT (member_function), 1); | |
14207 | cp_parser_late_parsing_default_args (parser, TREE_TYPE (member_function)); | |
14208 | if (DECL_FUNCTION_MEMBER_P (member_function)) | |
14209 | pop_nested_class (); | |
14210 | ||
14211 | /* If the body of the function has not yet been parsed, parse it | |
14212 | now. */ | |
14213 | if (DECL_PENDING_INLINE_P (member_function)) | |
14214 | { | |
14215 | tree function_scope; | |
14216 | cp_token_cache *tokens; | |
14217 | ||
14218 | /* The function is no longer pending; we are processing it. */ | |
14219 | tokens = DECL_PENDING_INLINE_INFO (member_function); | |
14220 | DECL_PENDING_INLINE_INFO (member_function) = NULL; | |
14221 | DECL_PENDING_INLINE_P (member_function) = 0; | |
14222 | /* If this was an inline function in a local class, enter the scope | |
14223 | of the containing function. */ | |
14224 | function_scope = decl_function_context (member_function); | |
14225 | if (function_scope) | |
14226 | push_function_context_to (function_scope); | |
14227 | ||
14228 | /* Save away the current lexer. */ | |
14229 | saved_lexer = parser->lexer; | |
14230 | /* Make a new lexer to feed us the tokens saved for this function. */ | |
14231 | parser->lexer = cp_lexer_new_from_tokens (tokens); | |
14232 | parser->lexer->next = saved_lexer; | |
14233 | ||
14234 | /* Set the current source position to be the location of the first | |
14235 | token in the saved inline body. */ | |
14236 | cp_lexer_set_source_position_from_token | |
14237 | (parser->lexer, | |
14238 | cp_lexer_peek_token (parser->lexer)); | |
14239 | ||
14240 | /* Let the front end know that we going to be defining this | |
14241 | function. */ | |
14242 | start_function (NULL_TREE, member_function, NULL_TREE, | |
14243 | SF_PRE_PARSED | SF_INCLASS_INLINE); | |
14244 | ||
14245 | /* Now, parse the body of the function. */ | |
14246 | cp_parser_function_definition_after_declarator (parser, | |
14247 | /*inline_p=*/true); | |
14248 | ||
14249 | /* Leave the scope of the containing function. */ | |
14250 | if (function_scope) | |
14251 | pop_function_context_from (function_scope); | |
14252 | /* Restore the lexer. */ | |
14253 | parser->lexer = saved_lexer; | |
14254 | } | |
14255 | ||
14256 | /* Remove any template parameters from the symbol table. */ | |
14257 | maybe_end_member_template_processing (); | |
14258 | ||
14259 | /* Restore the queue. */ | |
14260 | parser->unparsed_functions_queues | |
14261 | = TREE_CHAIN (parser->unparsed_functions_queues); | |
14262 | } | |
14263 | ||
14264 | /* TYPE is a FUNCTION_TYPE or METHOD_TYPE which contains a parameter | |
14265 | with an unparsed DEFAULT_ARG. Parse those default args now. */ | |
14266 | ||
14267 | static void | |
14268 | cp_parser_late_parsing_default_args (parser, type) | |
14269 | cp_parser *parser; | |
14270 | tree type; | |
14271 | { | |
14272 | cp_lexer *saved_lexer; | |
14273 | cp_token_cache *tokens; | |
14274 | bool saved_local_variables_forbidden_p; | |
14275 | tree parameters; | |
14276 | ||
14277 | for (parameters = TYPE_ARG_TYPES (type); | |
14278 | parameters; | |
14279 | parameters = TREE_CHAIN (parameters)) | |
14280 | { | |
14281 | if (!TREE_PURPOSE (parameters) | |
14282 | || TREE_CODE (TREE_PURPOSE (parameters)) != DEFAULT_ARG) | |
14283 | continue; | |
14284 | ||
14285 | /* Save away the current lexer. */ | |
14286 | saved_lexer = parser->lexer; | |
14287 | /* Create a new one, using the tokens we have saved. */ | |
14288 | tokens = DEFARG_TOKENS (TREE_PURPOSE (parameters)); | |
14289 | parser->lexer = cp_lexer_new_from_tokens (tokens); | |
14290 | ||
14291 | /* Set the current source position to be the location of the | |
14292 | first token in the default argument. */ | |
14293 | cp_lexer_set_source_position_from_token | |
14294 | (parser->lexer, cp_lexer_peek_token (parser->lexer)); | |
14295 | ||
14296 | /* Local variable names (and the `this' keyword) may not appear | |
14297 | in a default argument. */ | |
14298 | saved_local_variables_forbidden_p = parser->local_variables_forbidden_p; | |
14299 | parser->local_variables_forbidden_p = true; | |
14300 | /* Parse the assignment-expression. */ | |
14301 | TREE_PURPOSE (parameters) = cp_parser_assignment_expression (parser); | |
14302 | ||
14303 | /* Restore saved state. */ | |
14304 | parser->lexer = saved_lexer; | |
14305 | parser->local_variables_forbidden_p = saved_local_variables_forbidden_p; | |
14306 | } | |
14307 | } | |
14308 | ||
14309 | /* Parse the operand of `sizeof' (or a similar operator). Returns | |
14310 | either a TYPE or an expression, depending on the form of the | |
14311 | input. The KEYWORD indicates which kind of expression we have | |
14312 | encountered. */ | |
14313 | ||
14314 | static tree | |
14315 | cp_parser_sizeof_operand (parser, keyword) | |
14316 | cp_parser *parser; | |
14317 | enum rid keyword; | |
14318 | { | |
14319 | static const char *format; | |
14320 | tree expr = NULL_TREE; | |
14321 | const char *saved_message; | |
14322 | bool saved_constant_expression_p; | |
14323 | ||
14324 | /* Initialize FORMAT the first time we get here. */ | |
14325 | if (!format) | |
14326 | format = "types may not be defined in `%s' expressions"; | |
14327 | ||
14328 | /* Types cannot be defined in a `sizeof' expression. Save away the | |
14329 | old message. */ | |
14330 | saved_message = parser->type_definition_forbidden_message; | |
14331 | /* And create the new one. */ | |
14332 | parser->type_definition_forbidden_message | |
14333 | = ((const char *) | |
14334 | xmalloc (strlen (format) | |
14335 | + strlen (IDENTIFIER_POINTER (ridpointers[keyword])) | |
14336 | + 1 /* `\0' */)); | |
14337 | sprintf ((char *) parser->type_definition_forbidden_message, | |
14338 | format, IDENTIFIER_POINTER (ridpointers[keyword])); | |
14339 | ||
14340 | /* The restrictions on constant-expressions do not apply inside | |
14341 | sizeof expressions. */ | |
14342 | saved_constant_expression_p = parser->constant_expression_p; | |
14343 | parser->constant_expression_p = false; | |
14344 | ||
14345 | /* If it's a `(', then we might be looking at the type-id | |
14346 | construction. */ | |
14347 | if (cp_lexer_next_token_is (parser->lexer, CPP_OPEN_PAREN)) | |
14348 | { | |
14349 | tree type; | |
14350 | ||
14351 | /* We can't be sure yet whether we're looking at a type-id or an | |
14352 | expression. */ | |
14353 | cp_parser_parse_tentatively (parser); | |
14354 | /* Consume the `('. */ | |
14355 | cp_lexer_consume_token (parser->lexer); | |
14356 | /* Parse the type-id. */ | |
14357 | type = cp_parser_type_id (parser); | |
14358 | /* Now, look for the trailing `)'. */ | |
14359 | cp_parser_require (parser, CPP_CLOSE_PAREN, "`)'"); | |
14360 | /* If all went well, then we're done. */ | |
14361 | if (cp_parser_parse_definitely (parser)) | |
14362 | { | |
14363 | /* Build a list of decl-specifiers; right now, we have only | |
14364 | a single type-specifier. */ | |
14365 | type = build_tree_list (NULL_TREE, | |
14366 | type); | |
14367 | ||
14368 | /* Call grokdeclarator to figure out what type this is. */ | |
14369 | expr = grokdeclarator (NULL_TREE, | |
14370 | type, | |
14371 | TYPENAME, | |
14372 | /*initialized=*/0, | |
14373 | /*attrlist=*/NULL); | |
14374 | } | |
14375 | } | |
14376 | ||
14377 | /* If the type-id production did not work out, then we must be | |
14378 | looking at the unary-expression production. */ | |
14379 | if (!expr) | |
14380 | expr = cp_parser_unary_expression (parser, /*address_p=*/false); | |
14381 | ||
14382 | /* Free the message we created. */ | |
14383 | free ((char *) parser->type_definition_forbidden_message); | |
14384 | /* And restore the old one. */ | |
14385 | parser->type_definition_forbidden_message = saved_message; | |
14386 | parser->constant_expression_p = saved_constant_expression_p; | |
14387 | ||
14388 | return expr; | |
14389 | } | |
14390 | ||
14391 | /* If the current declaration has no declarator, return true. */ | |
14392 | ||
14393 | static bool | |
14394 | cp_parser_declares_only_class_p (cp_parser *parser) | |
14395 | { | |
14396 | /* If the next token is a `;' or a `,' then there is no | |
14397 | declarator. */ | |
14398 | return (cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON) | |
14399 | || cp_lexer_next_token_is (parser->lexer, CPP_COMMA)); | |
14400 | } | |
14401 | ||
14402 | /* DECL_SPECIFIERS is the representation of a decl-specifier-seq. | |
14403 | Returns TRUE iff `friend' appears among the DECL_SPECIFIERS. */ | |
14404 | ||
14405 | static bool | |
14406 | cp_parser_friend_p (decl_specifiers) | |
14407 | tree decl_specifiers; | |
14408 | { | |
14409 | while (decl_specifiers) | |
14410 | { | |
14411 | /* See if this decl-specifier is `friend'. */ | |
14412 | if (TREE_CODE (TREE_VALUE (decl_specifiers)) == IDENTIFIER_NODE | |
14413 | && C_RID_CODE (TREE_VALUE (decl_specifiers)) == RID_FRIEND) | |
14414 | return true; | |
14415 | ||
14416 | /* Go on to the next decl-specifier. */ | |
14417 | decl_specifiers = TREE_CHAIN (decl_specifiers); | |
14418 | } | |
14419 | ||
14420 | return false; | |
14421 | } | |
14422 | ||
14423 | /* If the next token is of the indicated TYPE, consume it. Otherwise, | |
14424 | issue an error message indicating that TOKEN_DESC was expected. | |
14425 | ||
14426 | Returns the token consumed, if the token had the appropriate type. | |
14427 | Otherwise, returns NULL. */ | |
14428 | ||
14429 | static cp_token * | |
14430 | cp_parser_require (parser, type, token_desc) | |
14431 | cp_parser *parser; | |
14432 | enum cpp_ttype type; | |
14433 | const char *token_desc; | |
14434 | { | |
14435 | if (cp_lexer_next_token_is (parser->lexer, type)) | |
14436 | return cp_lexer_consume_token (parser->lexer); | |
14437 | else | |
14438 | { | |
14439 | dyn_string_t error_msg; | |
14440 | ||
14441 | /* Format the error message. */ | |
14442 | error_msg = dyn_string_new (0); | |
14443 | dyn_string_append_cstr (error_msg, "expected "); | |
14444 | dyn_string_append_cstr (error_msg, token_desc); | |
14445 | cp_parser_error (parser, error_msg->s); | |
14446 | dyn_string_delete (error_msg); | |
14447 | return NULL; | |
14448 | } | |
14449 | } | |
14450 | ||
14451 | /* Like cp_parser_require, except that tokens will be skipped until | |
14452 | the desired token is found. An error message is still produced if | |
14453 | the next token is not as expected. */ | |
14454 | ||
14455 | static void | |
14456 | cp_parser_skip_until_found (parser, type, token_desc) | |
14457 | cp_parser *parser; | |
14458 | enum cpp_ttype type; | |
14459 | const char *token_desc; | |
14460 | { | |
14461 | cp_token *token; | |
14462 | unsigned nesting_depth = 0; | |
14463 | ||
14464 | if (cp_parser_require (parser, type, token_desc)) | |
14465 | return; | |
14466 | ||
14467 | /* Skip tokens until the desired token is found. */ | |
14468 | while (true) | |
14469 | { | |
14470 | /* Peek at the next token. */ | |
14471 | token = cp_lexer_peek_token (parser->lexer); | |
14472 | /* If we've reached the token we want, consume it and | |
14473 | stop. */ | |
14474 | if (token->type == type && !nesting_depth) | |
14475 | { | |
14476 | cp_lexer_consume_token (parser->lexer); | |
14477 | return; | |
14478 | } | |
14479 | /* If we've run out of tokens, stop. */ | |
14480 | if (token->type == CPP_EOF) | |
14481 | return; | |
14482 | if (token->type == CPP_OPEN_BRACE | |
14483 | || token->type == CPP_OPEN_PAREN | |
14484 | || token->type == CPP_OPEN_SQUARE) | |
14485 | ++nesting_depth; | |
14486 | else if (token->type == CPP_CLOSE_BRACE | |
14487 | || token->type == CPP_CLOSE_PAREN | |
14488 | || token->type == CPP_CLOSE_SQUARE) | |
14489 | { | |
14490 | if (nesting_depth-- == 0) | |
14491 | return; | |
14492 | } | |
14493 | /* Consume this token. */ | |
14494 | cp_lexer_consume_token (parser->lexer); | |
14495 | } | |
14496 | } | |
14497 | ||
14498 | /* If the next token is the indicated keyword, consume it. Otherwise, | |
14499 | issue an error message indicating that TOKEN_DESC was expected. | |
14500 | ||
14501 | Returns the token consumed, if the token had the appropriate type. | |
14502 | Otherwise, returns NULL. */ | |
14503 | ||
14504 | static cp_token * | |
14505 | cp_parser_require_keyword (parser, keyword, token_desc) | |
14506 | cp_parser *parser; | |
14507 | enum rid keyword; | |
14508 | const char *token_desc; | |
14509 | { | |
14510 | cp_token *token = cp_parser_require (parser, CPP_KEYWORD, token_desc); | |
14511 | ||
14512 | if (token && token->keyword != keyword) | |
14513 | { | |
14514 | dyn_string_t error_msg; | |
14515 | ||
14516 | /* Format the error message. */ | |
14517 | error_msg = dyn_string_new (0); | |
14518 | dyn_string_append_cstr (error_msg, "expected "); | |
14519 | dyn_string_append_cstr (error_msg, token_desc); | |
14520 | cp_parser_error (parser, error_msg->s); | |
14521 | dyn_string_delete (error_msg); | |
14522 | return NULL; | |
14523 | } | |
14524 | ||
14525 | return token; | |
14526 | } | |
14527 | ||
14528 | /* Returns TRUE iff TOKEN is a token that can begin the body of a | |
14529 | function-definition. */ | |
14530 | ||
14531 | static bool | |
14532 | cp_parser_token_starts_function_definition_p (token) | |
14533 | cp_token *token; | |
14534 | { | |
14535 | return (/* An ordinary function-body begins with an `{'. */ | |
14536 | token->type == CPP_OPEN_BRACE | |
14537 | /* A ctor-initializer begins with a `:'. */ | |
14538 | || token->type == CPP_COLON | |
14539 | /* A function-try-block begins with `try'. */ | |
14540 | || token->keyword == RID_TRY | |
14541 | /* The named return value extension begins with `return'. */ | |
14542 | || token->keyword == RID_RETURN); | |
14543 | } | |
14544 | ||
14545 | /* Returns TRUE iff the next token is the ":" or "{" beginning a class | |
14546 | definition. */ | |
14547 | ||
14548 | static bool | |
14549 | cp_parser_next_token_starts_class_definition_p (cp_parser *parser) | |
14550 | { | |
14551 | cp_token *token; | |
14552 | ||
14553 | token = cp_lexer_peek_token (parser->lexer); | |
14554 | return (token->type == CPP_OPEN_BRACE || token->type == CPP_COLON); | |
14555 | } | |
14556 | ||
14557 | /* Returns the kind of tag indicated by TOKEN, if it is a class-key, | |
14558 | or none_type otherwise. */ | |
14559 | ||
14560 | static enum tag_types | |
14561 | cp_parser_token_is_class_key (token) | |
14562 | cp_token *token; | |
14563 | { | |
14564 | switch (token->keyword) | |
14565 | { | |
14566 | case RID_CLASS: | |
14567 | return class_type; | |
14568 | case RID_STRUCT: | |
14569 | return record_type; | |
14570 | case RID_UNION: | |
14571 | return union_type; | |
14572 | ||
14573 | default: | |
14574 | return none_type; | |
14575 | } | |
14576 | } | |
14577 | ||
14578 | /* Issue an error message if the CLASS_KEY does not match the TYPE. */ | |
14579 | ||
14580 | static void | |
14581 | cp_parser_check_class_key (enum tag_types class_key, tree type) | |
14582 | { | |
14583 | if ((TREE_CODE (type) == UNION_TYPE) != (class_key == union_type)) | |
14584 | pedwarn ("`%s' tag used in naming `%#T'", | |
14585 | class_key == union_type ? "union" | |
14586 | : class_key == record_type ? "struct" : "class", | |
14587 | type); | |
14588 | } | |
14589 | ||
14590 | /* Look for the `template' keyword, as a syntactic disambiguator. | |
14591 | Return TRUE iff it is present, in which case it will be | |
14592 | consumed. */ | |
14593 | ||
14594 | static bool | |
14595 | cp_parser_optional_template_keyword (cp_parser *parser) | |
14596 | { | |
14597 | if (cp_lexer_next_token_is_keyword (parser->lexer, RID_TEMPLATE)) | |
14598 | { | |
14599 | /* The `template' keyword can only be used within templates; | |
14600 | outside templates the parser can always figure out what is a | |
14601 | template and what is not. */ | |
14602 | if (!processing_template_decl) | |
14603 | { | |
14604 | error ("`template' (as a disambiguator) is only allowed " | |
14605 | "within templates"); | |
14606 | /* If this part of the token stream is rescanned, the same | |
14607 | error message would be generated. So, we purge the token | |
14608 | from the stream. */ | |
14609 | cp_lexer_purge_token (parser->lexer); | |
14610 | return false; | |
14611 | } | |
14612 | else | |
14613 | { | |
14614 | /* Consume the `template' keyword. */ | |
14615 | cp_lexer_consume_token (parser->lexer); | |
14616 | return true; | |
14617 | } | |
14618 | } | |
14619 | ||
14620 | return false; | |
14621 | } | |
14622 | ||
14623 | /* Add tokens to CACHE until an non-nested END token appears. */ | |
14624 | ||
14625 | static void | |
14626 | cp_parser_cache_group (cp_parser *parser, | |
14627 | cp_token_cache *cache, | |
14628 | enum cpp_ttype end, | |
14629 | unsigned depth) | |
14630 | { | |
14631 | while (true) | |
14632 | { | |
14633 | cp_token *token; | |
14634 | ||
14635 | /* Abort a parenthesized expression if we encounter a brace. */ | |
14636 | if ((end == CPP_CLOSE_PAREN || depth == 0) | |
14637 | && cp_lexer_next_token_is (parser->lexer, CPP_SEMICOLON)) | |
14638 | return; | |
14639 | /* Consume the next token. */ | |
14640 | token = cp_lexer_consume_token (parser->lexer); | |
14641 | /* If we've reached the end of the file, stop. */ | |
14642 | if (token->type == CPP_EOF) | |
14643 | return; | |
14644 | /* Add this token to the tokens we are saving. */ | |
14645 | cp_token_cache_push_token (cache, token); | |
14646 | /* See if it starts a new group. */ | |
14647 | if (token->type == CPP_OPEN_BRACE) | |
14648 | { | |
14649 | cp_parser_cache_group (parser, cache, CPP_CLOSE_BRACE, depth + 1); | |
14650 | if (depth == 0) | |
14651 | return; | |
14652 | } | |
14653 | else if (token->type == CPP_OPEN_PAREN) | |
14654 | cp_parser_cache_group (parser, cache, CPP_CLOSE_PAREN, depth + 1); | |
14655 | else if (token->type == end) | |
14656 | return; | |
14657 | } | |
14658 | } | |
14659 | ||
14660 | /* Begin parsing tentatively. We always save tokens while parsing | |
14661 | tentatively so that if the tentative parsing fails we can restore the | |
14662 | tokens. */ | |
14663 | ||
14664 | static void | |
14665 | cp_parser_parse_tentatively (parser) | |
14666 | cp_parser *parser; | |
14667 | { | |
14668 | /* Enter a new parsing context. */ | |
14669 | parser->context = cp_parser_context_new (parser->context); | |
14670 | /* Begin saving tokens. */ | |
14671 | cp_lexer_save_tokens (parser->lexer); | |
14672 | /* In order to avoid repetitive access control error messages, | |
14673 | access checks are queued up until we are no longer parsing | |
14674 | tentatively. */ | |
14675 | cp_parser_start_deferring_access_checks (parser); | |
14676 | } | |
14677 | ||
14678 | /* Commit to the currently active tentative parse. */ | |
14679 | ||
14680 | static void | |
14681 | cp_parser_commit_to_tentative_parse (parser) | |
14682 | cp_parser *parser; | |
14683 | { | |
14684 | cp_parser_context *context; | |
14685 | cp_lexer *lexer; | |
14686 | ||
14687 | /* Mark all of the levels as committed. */ | |
14688 | lexer = parser->lexer; | |
14689 | for (context = parser->context; context->next; context = context->next) | |
14690 | { | |
14691 | if (context->status == CP_PARSER_STATUS_KIND_COMMITTED) | |
14692 | break; | |
14693 | context->status = CP_PARSER_STATUS_KIND_COMMITTED; | |
14694 | while (!cp_lexer_saving_tokens (lexer)) | |
14695 | lexer = lexer->next; | |
14696 | cp_lexer_commit_tokens (lexer); | |
14697 | } | |
14698 | } | |
14699 | ||
14700 | /* Abort the currently active tentative parse. All consumed tokens | |
14701 | will be rolled back, and no diagnostics will be issued. */ | |
14702 | ||
14703 | static void | |
14704 | cp_parser_abort_tentative_parse (parser) | |
14705 | cp_parser *parser; | |
14706 | { | |
14707 | cp_parser_simulate_error (parser); | |
14708 | /* Now, pretend that we want to see if the construct was | |
14709 | successfully parsed. */ | |
14710 | cp_parser_parse_definitely (parser); | |
14711 | } | |
14712 | ||
14713 | /* Stop parsing tentatively. If a parse error has ocurred, restore the | |
14714 | token stream. Otherwise, commit to the tokens we have consumed. | |
14715 | Returns true if no error occurred; false otherwise. */ | |
14716 | ||
14717 | static bool | |
14718 | cp_parser_parse_definitely (parser) | |
14719 | cp_parser *parser; | |
14720 | { | |
14721 | bool error_occurred; | |
14722 | cp_parser_context *context; | |
14723 | ||
14724 | /* Remember whether or not an error ocurred, since we are about to | |
14725 | destroy that information. */ | |
14726 | error_occurred = cp_parser_error_occurred (parser); | |
14727 | /* Remove the topmost context from the stack. */ | |
14728 | context = parser->context; | |
14729 | parser->context = context->next; | |
14730 | /* If no parse errors occurred, commit to the tentative parse. */ | |
14731 | if (!error_occurred) | |
14732 | { | |
14733 | /* Commit to the tokens read tentatively, unless that was | |
14734 | already done. */ | |
14735 | if (context->status != CP_PARSER_STATUS_KIND_COMMITTED) | |
14736 | cp_lexer_commit_tokens (parser->lexer); | |
14737 | if (!parser->context->deferring_access_checks_p) | |
14738 | /* If in the parent context we are not deferring checks, then | |
14739 | these perform these checks now. */ | |
14740 | (cp_parser_perform_deferred_access_checks | |
14741 | (context->deferred_access_checks)); | |
14742 | else | |
14743 | /* Any lookups that were deferred during the tentative parse are | |
14744 | still deferred. */ | |
14745 | parser->context->deferred_access_checks | |
14746 | = chainon (parser->context->deferred_access_checks, | |
14747 | context->deferred_access_checks); | |
14748 | return true; | |
14749 | } | |
14750 | /* Otherwise, if errors occurred, roll back our state so that things | |
14751 | are just as they were before we began the tentative parse. */ | |
14752 | else | |
14753 | { | |
14754 | cp_lexer_rollback_tokens (parser->lexer); | |
14755 | return false; | |
14756 | } | |
14757 | } | |
14758 | ||
14759 | /* Returns non-zero if we are parsing tentatively. */ | |
14760 | ||
14761 | static bool | |
14762 | cp_parser_parsing_tentatively (parser) | |
14763 | cp_parser *parser; | |
14764 | { | |
14765 | return parser->context->next != NULL; | |
14766 | } | |
14767 | ||
14768 | /* Returns true if we are parsing tentatively -- but have decided that | |
14769 | we will stick with this tentative parse, even if errors occur. */ | |
14770 | ||
14771 | static bool | |
14772 | cp_parser_committed_to_tentative_parse (parser) | |
14773 | cp_parser *parser; | |
14774 | { | |
14775 | return (cp_parser_parsing_tentatively (parser) | |
14776 | && parser->context->status == CP_PARSER_STATUS_KIND_COMMITTED); | |
14777 | } | |
14778 | ||
14779 | /* Returns non-zero iff an error has occurred during the most recent | |
14780 | tentative parse. */ | |
14781 | ||
14782 | static bool | |
14783 | cp_parser_error_occurred (parser) | |
14784 | cp_parser *parser; | |
14785 | { | |
14786 | return (cp_parser_parsing_tentatively (parser) | |
14787 | && parser->context->status == CP_PARSER_STATUS_KIND_ERROR); | |
14788 | } | |
14789 | ||
14790 | /* Returns non-zero if GNU extensions are allowed. */ | |
14791 | ||
14792 | static bool | |
14793 | cp_parser_allow_gnu_extensions_p (parser) | |
14794 | cp_parser *parser; | |
14795 | { | |
14796 | return parser->allow_gnu_extensions_p; | |
14797 | } | |
14798 | ||
14799 | \f | |
14800 | ||
14801 | /* The parser. */ | |
14802 | ||
14803 | static GTY (()) cp_parser *the_parser; | |
14804 | ||
14805 | /* External interface. */ | |
14806 | ||
14807 | /* Parse the entire translation unit. */ | |
14808 | ||
14809 | int | |
14810 | yyparse () | |
14811 | { | |
14812 | bool error_occurred; | |
14813 | ||
14814 | the_parser = cp_parser_new (); | |
14815 | error_occurred = cp_parser_translation_unit (the_parser); | |
14816 | the_parser = NULL; | |
14817 | ||
14818 | return error_occurred; | |
14819 | } | |
14820 | ||
14821 | /* Clean up after parsing the entire translation unit. */ | |
14822 | ||
14823 | void | |
14824 | free_parser_stacks () | |
14825 | { | |
14826 | /* Nothing to do. */ | |
14827 | } | |
14828 | ||
14829 | /* This variable must be provided by every front end. */ | |
14830 | ||
14831 | int yydebug; | |
14832 | ||
14833 | #include "gt-cp-parser.h" |