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93c80368 | 1 | /* Part of CPP library. (Macro and #define handling.) |
711b8824 | 2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998, |
d9221e01 | 3 | 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
711b8824 ZW |
4 | Written by Per Bothner, 1994. |
5 | Based on CCCP program by Paul Rubin, June 1986 | |
6 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by the | |
10 | Free Software Foundation; either version 2, or (at your option) any | |
11 | later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | ||
22 | In other words, you are welcome to use, share and improve this program. | |
23 | You are forbidden to forbid anyone else to use, share and improve | |
24 | what you give them. Help stamp out software-hoarding! */ | |
25 | ||
26 | #include "config.h" | |
27 | #include "system.h" | |
28 | #include "cpplib.h" | |
29 | #include "cpphash.h" | |
30 | ||
93c80368 NB |
31 | typedef struct macro_arg macro_arg; |
32 | struct macro_arg | |
33 | { | |
4ed5bcfb | 34 | const cpp_token **first; /* First token in unexpanded argument. */ |
6d2f8887 | 35 | const cpp_token **expanded; /* Macro-expanded argument. */ |
4ed5bcfb | 36 | const cpp_token *stringified; /* Stringified argument. */ |
93c80368 NB |
37 | unsigned int count; /* # of tokens in argument. */ |
38 | unsigned int expanded_count; /* # of tokens in expanded argument. */ | |
711b8824 ZW |
39 | }; |
40 | ||
93c80368 NB |
41 | /* Macro expansion. */ |
42 | ||
6cf87ca4 ZW |
43 | static int enter_macro_context (cpp_reader *, cpp_hashnode *); |
44 | static int builtin_macro (cpp_reader *, cpp_hashnode *); | |
45 | static void push_token_context (cpp_reader *, cpp_hashnode *, | |
46 | const cpp_token *, unsigned int); | |
47 | static void push_ptoken_context (cpp_reader *, cpp_hashnode *, _cpp_buff *, | |
48 | const cpp_token **, unsigned int); | |
49 | static _cpp_buff *collect_args (cpp_reader *, const cpp_hashnode *); | |
50 | static cpp_context *next_context (cpp_reader *); | |
51 | static const cpp_token *padding_token (cpp_reader *, const cpp_token *); | |
52 | static void expand_arg (cpp_reader *, macro_arg *); | |
53 | static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int); | |
54 | static const cpp_token *stringify_arg (cpp_reader *, macro_arg *); | |
55 | static void paste_all_tokens (cpp_reader *, const cpp_token *); | |
56 | static bool paste_tokens (cpp_reader *, const cpp_token **, const cpp_token *); | |
57 | static void replace_args (cpp_reader *, cpp_hashnode *, cpp_macro *, | |
58 | macro_arg *); | |
59 | static _cpp_buff *funlike_invocation_p (cpp_reader *, cpp_hashnode *); | |
60 | static bool create_iso_definition (cpp_reader *, cpp_macro *); | |
93c80368 | 61 | |
93c80368 NB |
62 | /* #define directive parsing and handling. */ |
63 | ||
6cf87ca4 ZW |
64 | static cpp_token *alloc_expansion_token (cpp_reader *, cpp_macro *); |
65 | static cpp_token *lex_expansion_token (cpp_reader *, cpp_macro *); | |
66 | static bool warn_of_redefinition (cpp_reader *, const cpp_hashnode *, | |
67 | const cpp_macro *); | |
68 | static bool parse_params (cpp_reader *, cpp_macro *); | |
69 | static void check_trad_stringification (cpp_reader *, const cpp_macro *, | |
70 | const cpp_string *); | |
711b8824 | 71 | |
a69cbaac NB |
72 | /* Emits a warning if NODE is a macro defined in the main file that |
73 | has not been used. */ | |
74 | int | |
6cf87ca4 ZW |
75 | _cpp_warn_if_unused_macro (cpp_reader *pfile, cpp_hashnode *node, |
76 | void *v ATTRIBUTE_UNUSED) | |
a69cbaac NB |
77 | { |
78 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) | |
79 | { | |
80 | cpp_macro *macro = node->value.macro; | |
81 | ||
82 | if (!macro->used | |
50f59cd7 | 83 | && MAIN_FILE_P (linemap_lookup (pfile->line_table, macro->line))) |
0527bc4e | 84 | cpp_error_with_line (pfile, CPP_DL_WARNING, macro->line, 0, |
a69cbaac NB |
85 | "macro \"%s\" is not used", NODE_NAME (node)); |
86 | } | |
87 | ||
88 | return 1; | |
89 | } | |
90 | ||
4ed5bcfb NB |
91 | /* Allocates and returns a CPP_STRING token, containing TEXT of length |
92 | LEN, after null-terminating it. TEXT must be in permanent storage. */ | |
93 | static const cpp_token * | |
6cf87ca4 | 94 | new_string_token (cpp_reader *pfile, unsigned char *text, unsigned int len) |
93c80368 | 95 | { |
4ed5bcfb | 96 | cpp_token *token = _cpp_temp_token (pfile); |
93c80368 | 97 | |
4ed5bcfb | 98 | text[len] = '\0'; |
93c80368 | 99 | token->type = CPP_STRING; |
4ed5bcfb NB |
100 | token->val.str.len = len; |
101 | token->val.str.text = text; | |
93c80368 | 102 | token->flags = 0; |
4ed5bcfb | 103 | return token; |
93c80368 NB |
104 | } |
105 | ||
93c80368 NB |
106 | static const char * const monthnames[] = |
107 | { | |
108 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
109 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | |
110 | }; | |
111 | ||
644eddaa NB |
112 | /* Handle builtin macros like __FILE__, and push the resulting token |
113 | on the context stack. Also handles _Pragma, for which no new token | |
d15a58c0 NB |
114 | is created. Returns 1 if it generates a new token context, 0 to |
115 | return the token to the caller. */ | |
278c4662 | 116 | const uchar * |
6cf87ca4 | 117 | _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node) |
93c80368 | 118 | { |
12f9df4e | 119 | const struct line_map *map; |
278c4662 NB |
120 | const uchar *result = NULL; |
121 | unsigned int number = 1; | |
644eddaa | 122 | |
93c80368 NB |
123 | switch (node->value.builtin) |
124 | { | |
4ed5bcfb | 125 | default: |
0527bc4e | 126 | cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", |
ebef4e8c | 127 | NODE_NAME (node)); |
278c4662 | 128 | break; |
4ed5bcfb | 129 | |
93c80368 NB |
130 | case BT_FILE: |
131 | case BT_BASE_FILE: | |
711b8824 | 132 | { |
4ed5bcfb | 133 | unsigned int len; |
0bda4760 | 134 | const char *name; |
562a5c27 | 135 | uchar *buf; |
12f9df4e | 136 | map = linemap_lookup (pfile->line_table, pfile->line); |
0bda4760 NB |
137 | |
138 | if (node->value.builtin == BT_BASE_FILE) | |
bb74c963 | 139 | while (! MAIN_FILE_P (map)) |
50f59cd7 | 140 | map = INCLUDED_FROM (pfile->line_table, map); |
0bda4760 | 141 | |
bb74c963 | 142 | name = map->to_file; |
4ed5bcfb | 143 | len = strlen (name); |
278c4662 NB |
144 | buf = _cpp_unaligned_alloc (pfile, len * 4 + 3); |
145 | result = buf; | |
146 | *buf = '"'; | |
147 | buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len); | |
148 | *buf++ = '"'; | |
149 | *buf = '\0'; | |
711b8824 | 150 | } |
644eddaa NB |
151 | break; |
152 | ||
93c80368 | 153 | case BT_INCLUDE_LEVEL: |
d8693c6f NB |
154 | /* The line map depth counts the primary source as level 1, but |
155 | historically __INCLUDE_DEPTH__ has called the primary source | |
156 | level 0. */ | |
50f59cd7 | 157 | number = pfile->line_table->depth - 1; |
644eddaa | 158 | break; |
93c80368 NB |
159 | |
160 | case BT_SPECLINE: | |
12f9df4e | 161 | map = linemap_lookup (pfile->line_table, pfile->line); |
93c80368 NB |
162 | /* If __LINE__ is embedded in a macro, it must expand to the |
163 | line of the macro's invocation, not its definition. | |
164 | Otherwise things like assert() will not work properly. */ | |
278c4662 NB |
165 | if (CPP_OPTION (pfile, traditional)) |
166 | number = pfile->line; | |
167 | else | |
12f9df4e PB |
168 | number = pfile->cur_token[-1].src_loc; |
169 | number = SOURCE_LINE (map, number); | |
644eddaa | 170 | break; |
93c80368 | 171 | |
5279d739 ZW |
172 | /* __STDC__ has the value 1 under normal circumstances. |
173 | However, if (a) we are in a system header, (b) the option | |
2a1dc0d8 ZW |
174 | stdc_0_in_system_headers is true (set by target config), and |
175 | (c) we are not in strictly conforming mode, then it has the | |
176 | value 0. */ | |
93c80368 NB |
177 | case BT_STDC: |
178 | { | |
12f9df4e | 179 | if (cpp_in_system_header (pfile) |
5279d739 | 180 | && CPP_OPTION (pfile, stdc_0_in_system_headers) |
58551c23 | 181 | && !CPP_OPTION (pfile,std)) |
278c4662 | 182 | number = 0; |
5279d739 | 183 | else |
278c4662 | 184 | number = 1; |
93c80368 | 185 | } |
644eddaa | 186 | break; |
711b8824 | 187 | |
93c80368 NB |
188 | case BT_DATE: |
189 | case BT_TIME: | |
278c4662 | 190 | if (pfile->date == NULL) |
93c80368 | 191 | { |
4ed5bcfb NB |
192 | /* Allocate __DATE__ and __TIME__ strings from permanent |
193 | storage. We only do this once, and don't generate them | |
194 | at init time, because time() and localtime() are very | |
195 | slow on some systems. */ | |
56da7207 ZW |
196 | time_t tt; |
197 | struct tm *tb = NULL; | |
198 | ||
199 | /* (time_t) -1 is a legitimate value for "number of seconds | |
200 | since the Epoch", so we have to do a little dance to | |
201 | distinguish that from a genuine error. */ | |
202 | errno = 0; | |
203 | tt = time(NULL); | |
204 | if (tt != (time_t)-1 || errno == 0) | |
205 | tb = localtime (&tt); | |
206 | ||
207 | if (tb) | |
208 | { | |
209 | pfile->date = _cpp_unaligned_alloc (pfile, | |
210 | sizeof ("\"Oct 11 1347\"")); | |
211 | sprintf ((char *) pfile->date, "\"%s %2d %4d\"", | |
6cf87ca4 ZW |
212 | monthnames[tb->tm_mon], tb->tm_mday, |
213 | tb->tm_year + 1900); | |
56da7207 ZW |
214 | |
215 | pfile->time = _cpp_unaligned_alloc (pfile, | |
216 | sizeof ("\"12:34:56\"")); | |
217 | sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", | |
218 | tb->tm_hour, tb->tm_min, tb->tm_sec); | |
219 | } | |
220 | else | |
221 | { | |
0527bc4e | 222 | cpp_errno (pfile, CPP_DL_WARNING, |
56da7207 ZW |
223 | "could not determine date and time"); |
224 | ||
225 | pfile->date = U"\"??? ?? ????\""; | |
226 | pfile->time = U"\"??:??:??\""; | |
227 | } | |
93c80368 | 228 | } |
93c80368 | 229 | |
644eddaa | 230 | if (node->value.builtin == BT_DATE) |
278c4662 | 231 | result = pfile->date; |
644eddaa | 232 | else |
278c4662 | 233 | result = pfile->time; |
644eddaa | 234 | break; |
278c4662 NB |
235 | } |
236 | ||
237 | if (result == NULL) | |
238 | { | |
239 | /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ | |
240 | result = _cpp_unaligned_alloc (pfile, 21); | |
241 | sprintf ((char *) result, "%u", number); | |
242 | } | |
243 | ||
244 | return result; | |
245 | } | |
246 | ||
247 | /* Convert builtin macros like __FILE__ to a token and push it on the | |
248 | context stack. Also handles _Pragma, for which no new token is | |
249 | created. Returns 1 if it generates a new token context, 0 to | |
250 | return the token to the caller. */ | |
251 | static int | |
6cf87ca4 | 252 | builtin_macro (cpp_reader *pfile, cpp_hashnode *node) |
278c4662 NB |
253 | { |
254 | const uchar *buf; | |
26aea073 NB |
255 | size_t len; |
256 | char *nbuf; | |
644eddaa | 257 | |
278c4662 NB |
258 | if (node->value.builtin == BT_PRAGMA) |
259 | { | |
644eddaa NB |
260 | /* Don't interpret _Pragma within directives. The standard is |
261 | not clear on this, but to me this makes most sense. */ | |
262 | if (pfile->state.in_directive) | |
263 | return 0; | |
264 | ||
265 | _cpp_do__Pragma (pfile); | |
266 | return 1; | |
93c80368 | 267 | } |
644eddaa | 268 | |
278c4662 | 269 | buf = _cpp_builtin_macro_text (pfile, node); |
26aea073 NB |
270 | len = ustrlen (buf); |
271 | nbuf = alloca (len + 1); | |
272 | memcpy (nbuf, buf, len); | |
273 | nbuf[len]='\n'; | |
278c4662 | 274 | |
40de9f76 | 275 | cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true); |
26aea073 | 276 | _cpp_clean_line (pfile); |
278c4662 NB |
277 | |
278 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
279 | pfile->cur_token = _cpp_temp_token (pfile); | |
280 | push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1); | |
281 | if (pfile->buffer->cur != pfile->buffer->rlimit) | |
0527bc4e | 282 | cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", |
278c4662 NB |
283 | NODE_NAME (node)); |
284 | _cpp_pop_buffer (pfile); | |
285 | ||
644eddaa | 286 | return 1; |
711b8824 ZW |
287 | } |
288 | ||
d15a58c0 NB |
289 | /* Copies SRC, of length LEN, to DEST, adding backslashes before all |
290 | backslashes and double quotes. Non-printable characters are | |
dcc229e5 ZW |
291 | converted to octal. DEST must be of sufficient size. Returns |
292 | a pointer to the end of the string. */ | |
562a5c27 | 293 | uchar * |
6cf87ca4 | 294 | cpp_quote_string (uchar *dest, const uchar *src, unsigned int len) |
93c80368 NB |
295 | { |
296 | while (len--) | |
297 | { | |
562a5c27 | 298 | uchar c = *src++; |
711b8824 | 299 | |
93c80368 NB |
300 | if (c == '\\' || c == '"') |
301 | { | |
302 | *dest++ = '\\'; | |
303 | *dest++ = c; | |
304 | } | |
305 | else | |
306 | { | |
307 | if (ISPRINT (c)) | |
308 | *dest++ = c; | |
309 | else | |
711b8824 | 310 | { |
93c80368 NB |
311 | sprintf ((char *) dest, "\\%03o", c); |
312 | dest += 4; | |
711b8824 | 313 | } |
93c80368 NB |
314 | } |
315 | } | |
711b8824 | 316 | |
93c80368 NB |
317 | return dest; |
318 | } | |
711b8824 | 319 | |
d15a58c0 NB |
320 | /* Convert a token sequence ARG to a single string token according to |
321 | the rules of the ISO C #-operator. */ | |
4ed5bcfb | 322 | static const cpp_token * |
6cf87ca4 | 323 | stringify_arg (cpp_reader *pfile, macro_arg *arg) |
93c80368 | 324 | { |
6338b358 | 325 | unsigned char *dest; |
ece54d54 | 326 | unsigned int i, escape_it, backslash_count = 0; |
4ed5bcfb | 327 | const cpp_token *source = NULL; |
ece54d54 | 328 | size_t len; |
711b8824 | 329 | |
6338b358 NB |
330 | if (BUFF_ROOM (pfile->u_buff) < 3) |
331 | _cpp_extend_buff (pfile, &pfile->u_buff, 3); | |
332 | dest = BUFF_FRONT (pfile->u_buff); | |
333 | *dest++ = '"'; | |
334 | ||
93c80368 NB |
335 | /* Loop, reading in the argument's tokens. */ |
336 | for (i = 0; i < arg->count; i++) | |
337 | { | |
4ed5bcfb | 338 | const cpp_token *token = arg->first[i]; |
4ed5bcfb NB |
339 | |
340 | if (token->type == CPP_PADDING) | |
341 | { | |
342 | if (source == NULL) | |
343 | source = token->val.source; | |
344 | continue; | |
345 | } | |
711b8824 | 346 | |
93c80368 | 347 | escape_it = (token->type == CPP_STRING || token->type == CPP_WSTRING |
cc937581 | 348 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); |
711b8824 | 349 | |
ece54d54 | 350 | /* Room for each char being written in octal, initial space and |
6338b358 | 351 | final quote and NUL. */ |
4ed5bcfb | 352 | len = cpp_token_len (token); |
93c80368 | 353 | if (escape_it) |
93c80368 | 354 | len *= 4; |
6338b358 | 355 | len += 3; |
711b8824 | 356 | |
ece54d54 | 357 | if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) |
93c80368 | 358 | { |
ece54d54 | 359 | size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); |
8c3b2693 | 360 | _cpp_extend_buff (pfile, &pfile->u_buff, len); |
ece54d54 | 361 | dest = BUFF_FRONT (pfile->u_buff) + len_so_far; |
93c80368 | 362 | } |
711b8824 | 363 | |
4ed5bcfb | 364 | /* Leading white space? */ |
6338b358 | 365 | if (dest - 1 != BUFF_FRONT (pfile->u_buff)) |
4ed5bcfb NB |
366 | { |
367 | if (source == NULL) | |
368 | source = token; | |
369 | if (source->flags & PREV_WHITE) | |
370 | *dest++ = ' '; | |
371 | } | |
372 | source = NULL; | |
711b8824 | 373 | |
93c80368 NB |
374 | if (escape_it) |
375 | { | |
ece54d54 NB |
376 | _cpp_buff *buff = _cpp_get_buff (pfile, len); |
377 | unsigned char *buf = BUFF_FRONT (buff); | |
93c80368 | 378 | len = cpp_spell_token (pfile, token, buf) - buf; |
dcc229e5 | 379 | dest = cpp_quote_string (dest, buf, len); |
ece54d54 | 380 | _cpp_release_buff (pfile, buff); |
93c80368 NB |
381 | } |
382 | else | |
383 | dest = cpp_spell_token (pfile, token, dest); | |
93c80368 | 384 | |
1067694a | 385 | if (token->type == CPP_OTHER && token->val.str.text[0] == '\\') |
93c80368 NB |
386 | backslash_count++; |
387 | else | |
388 | backslash_count = 0; | |
389 | } | |
390 | ||
391 | /* Ignore the final \ of invalid string literals. */ | |
392 | if (backslash_count & 1) | |
393 | { | |
0527bc4e | 394 | cpp_error (pfile, CPP_DL_WARNING, |
ebef4e8c | 395 | "invalid string literal, ignoring final '\\'"); |
ece54d54 | 396 | dest--; |
93c80368 NB |
397 | } |
398 | ||
4ed5bcfb | 399 | /* Commit the memory, including NUL, and return the token. */ |
6338b358 | 400 | *dest++ = '"'; |
ece54d54 NB |
401 | len = dest - BUFF_FRONT (pfile->u_buff); |
402 | BUFF_FRONT (pfile->u_buff) = dest + 1; | |
403 | return new_string_token (pfile, dest - len, len); | |
93c80368 NB |
404 | } |
405 | ||
da7d8304 | 406 | /* Try to paste two tokens. On success, return nonzero. In any |
c9e7a609 NB |
407 | case, PLHS is updated to point to the pasted token, which is |
408 | guaranteed to not have the PASTE_LEFT flag set. */ | |
409 | static bool | |
6cf87ca4 | 410 | paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs) |
d63eefbf | 411 | { |
c9e7a609 NB |
412 | unsigned char *buf, *end; |
413 | const cpp_token *lhs; | |
414 | unsigned int len; | |
415 | bool valid; | |
416 | ||
417 | lhs = *plhs; | |
418 | len = cpp_token_len (lhs) + cpp_token_len (rhs) + 1; | |
703ad42b | 419 | buf = alloca (len); |
c9e7a609 NB |
420 | end = cpp_spell_token (pfile, lhs, buf); |
421 | ||
422 | /* Avoid comment headers, since they are still processed in stage 3. | |
423 | It is simpler to insert a space here, rather than modifying the | |
424 | lexer to ignore comments in some circumstances. Simply returning | |
425 | false doesn't work, since we want to clear the PASTE_LEFT flag. */ | |
5cc67323 | 426 | if (lhs->type == CPP_DIV && rhs->type != CPP_EQ) |
c9e7a609 NB |
427 | *end++ = ' '; |
428 | end = cpp_spell_token (pfile, rhs, end); | |
26aea073 | 429 | *end = '\n'; |
c9e7a609 | 430 | |
40de9f76 | 431 | cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true); |
26aea073 | 432 | _cpp_clean_line (pfile); |
c9e7a609 NB |
433 | |
434 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
435 | pfile->cur_token = _cpp_temp_token (pfile); | |
436 | *plhs = _cpp_lex_direct (pfile); | |
480709cc | 437 | valid = pfile->buffer->cur == pfile->buffer->rlimit; |
c9e7a609 NB |
438 | _cpp_pop_buffer (pfile); |
439 | ||
440 | return valid; | |
d63eefbf NB |
441 | } |
442 | ||
d15a58c0 NB |
443 | /* Handles an arbitrarily long sequence of ## operators, with initial |
444 | operand LHS. This implementation is left-associative, | |
445 | non-recursive, and finishes a paste before handling succeeding | |
446 | ones. If a paste fails, we back up to the RHS of the failing ## | |
447 | operator before pushing the context containing the result of prior | |
448 | successful pastes, with the effect that the RHS appears in the | |
449 | output stream after the pasted LHS normally. */ | |
93c80368 | 450 | static void |
6cf87ca4 | 451 | paste_all_tokens (cpp_reader *pfile, const cpp_token *lhs) |
93c80368 | 452 | { |
4ed5bcfb NB |
453 | const cpp_token *rhs; |
454 | cpp_context *context = pfile->context; | |
455 | ||
93c80368 NB |
456 | do |
457 | { | |
458 | /* Take the token directly from the current context. We can do | |
459 | this, because we are in the replacement list of either an | |
460 | object-like macro, or a function-like macro with arguments | |
461 | inserted. In either case, the constraints to #define | |
d63eefbf | 462 | guarantee we have at least one more token. */ |
4ed5bcfb | 463 | if (context->direct_p) |
82eda77e | 464 | rhs = FIRST (context).token++; |
4ed5bcfb | 465 | else |
82eda77e | 466 | rhs = *FIRST (context).ptoken++; |
4ed5bcfb NB |
467 | |
468 | if (rhs->type == CPP_PADDING) | |
469 | abort (); | |
470 | ||
c9e7a609 | 471 | if (!paste_tokens (pfile, &lhs, rhs)) |
93c80368 | 472 | { |
4ed5bcfb | 473 | _cpp_backup_tokens (pfile, 1); |
c9e7a609 | 474 | |
c3bf3e6e | 475 | /* Mandatory error for all apart from assembler. */ |
c9e7a609 | 476 | if (CPP_OPTION (pfile, lang) != CLK_ASM) |
0527bc4e | 477 | cpp_error (pfile, CPP_DL_ERROR, |
c9e7a609 | 478 | "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", |
ebef4e8c NB |
479 | cpp_token_as_text (pfile, lhs), |
480 | cpp_token_as_text (pfile, rhs)); | |
4c2b647d | 481 | break; |
93c80368 | 482 | } |
93c80368 NB |
483 | } |
484 | while (rhs->flags & PASTE_LEFT); | |
485 | ||
c9e7a609 NB |
486 | /* Put the resulting token in its own context. */ |
487 | push_token_context (pfile, NULL, lhs, 1); | |
93c80368 NB |
488 | } |
489 | ||
1ce676a0 NB |
490 | /* Returns TRUE if the number of arguments ARGC supplied in an |
491 | invocation of the MACRO referenced by NODE is valid. An empty | |
492 | invocation to a macro with no parameters should pass ARGC as zero. | |
493 | ||
494 | Note that MACRO cannot necessarily be deduced from NODE, in case | |
495 | NODE was redefined whilst collecting arguments. */ | |
496 | bool | |
6cf87ca4 | 497 | _cpp_arguments_ok (cpp_reader *pfile, cpp_macro *macro, const cpp_hashnode *node, unsigned int argc) |
1ce676a0 NB |
498 | { |
499 | if (argc == macro->paramc) | |
500 | return true; | |
501 | ||
502 | if (argc < macro->paramc) | |
503 | { | |
504 | /* As an extension, a rest argument is allowed to not appear in | |
505 | the invocation at all. | |
506 | e.g. #define debug(format, args...) something | |
507 | debug("string"); | |
508 | ||
509 | This is exactly the same as if there had been an empty rest | |
510 | argument - debug("string", ). */ | |
511 | ||
512 | if (argc + 1 == macro->paramc && macro->variadic) | |
513 | { | |
514 | if (CPP_PEDANTIC (pfile) && ! macro->syshdr) | |
0527bc4e | 515 | cpp_error (pfile, CPP_DL_PEDWARN, |
1ce676a0 NB |
516 | "ISO C99 requires rest arguments to be used"); |
517 | return true; | |
518 | } | |
519 | ||
0527bc4e | 520 | cpp_error (pfile, CPP_DL_ERROR, |
1ce676a0 NB |
521 | "macro \"%s\" requires %u arguments, but only %u given", |
522 | NODE_NAME (node), macro->paramc, argc); | |
523 | } | |
524 | else | |
0527bc4e | 525 | cpp_error (pfile, CPP_DL_ERROR, |
1ce676a0 NB |
526 | "macro \"%s\" passed %u arguments, but takes just %u", |
527 | NODE_NAME (node), argc, macro->paramc); | |
528 | ||
529 | return false; | |
530 | } | |
531 | ||
d15a58c0 NB |
532 | /* Reads and returns the arguments to a function-like macro |
533 | invocation. Assumes the opening parenthesis has been processed. | |
534 | If there is an error, emits an appropriate diagnostic and returns | |
535 | NULL. Each argument is terminated by a CPP_EOF token, for the | |
536 | future benefit of expand_arg(). */ | |
b8af0ca5 | 537 | static _cpp_buff * |
6cf87ca4 | 538 | collect_args (cpp_reader *pfile, const cpp_hashnode *node) |
93c80368 | 539 | { |
b8af0ca5 NB |
540 | _cpp_buff *buff, *base_buff; |
541 | cpp_macro *macro; | |
542 | macro_arg *args, *arg; | |
543 | const cpp_token *token; | |
544 | unsigned int argc; | |
b8af0ca5 NB |
545 | |
546 | macro = node->value.macro; | |
547 | if (macro->paramc) | |
548 | argc = macro->paramc; | |
549 | else | |
550 | argc = 1; | |
551 | buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) | |
552 | + sizeof (macro_arg))); | |
553 | base_buff = buff; | |
554 | args = (macro_arg *) buff->base; | |
555 | memset (args, 0, argc * sizeof (macro_arg)); | |
ece54d54 | 556 | buff->cur = (unsigned char *) &args[argc]; |
b8af0ca5 NB |
557 | arg = args, argc = 0; |
558 | ||
559 | /* Collect the tokens making up each argument. We don't yet know | |
560 | how many arguments have been supplied, whether too many or too | |
561 | few. Hence the slightly bizarre usage of "argc" and "arg". */ | |
562 | do | |
93c80368 | 563 | { |
b8af0ca5 NB |
564 | unsigned int paren_depth = 0; |
565 | unsigned int ntokens = 0; | |
93c80368 | 566 | |
b8af0ca5 NB |
567 | argc++; |
568 | arg->first = (const cpp_token **) buff->cur; | |
711b8824 | 569 | |
b8af0ca5 NB |
570 | for (;;) |
571 | { | |
572 | /* Require space for 2 new tokens (including a CPP_EOF). */ | |
ece54d54 | 573 | if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) |
b8af0ca5 | 574 | { |
8c3b2693 NB |
575 | buff = _cpp_append_extend_buff (pfile, buff, |
576 | 1000 * sizeof (cpp_token *)); | |
b8af0ca5 NB |
577 | arg->first = (const cpp_token **) buff->cur; |
578 | } | |
4ed5bcfb | 579 | |
b8af0ca5 | 580 | token = cpp_get_token (pfile); |
711b8824 | 581 | |
b8af0ca5 NB |
582 | if (token->type == CPP_PADDING) |
583 | { | |
584 | /* Drop leading padding. */ | |
585 | if (ntokens == 0) | |
586 | continue; | |
587 | } | |
588 | else if (token->type == CPP_OPEN_PAREN) | |
589 | paren_depth++; | |
590 | else if (token->type == CPP_CLOSE_PAREN) | |
591 | { | |
592 | if (paren_depth-- == 0) | |
593 | break; | |
594 | } | |
595 | else if (token->type == CPP_COMMA) | |
596 | { | |
597 | /* A comma does not terminate an argument within | |
598 | parentheses or as part of a variable argument. */ | |
599 | if (paren_depth == 0 | |
600 | && ! (macro->variadic && argc == macro->paramc)) | |
601 | break; | |
602 | } | |
603 | else if (token->type == CPP_EOF | |
604 | || (token->type == CPP_HASH && token->flags & BOL)) | |
605 | break; | |
93c80368 | 606 | |
b8af0ca5 NB |
607 | arg->first[ntokens++] = token; |
608 | } | |
93c80368 | 609 | |
b8af0ca5 NB |
610 | /* Drop trailing padding. */ |
611 | while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) | |
612 | ntokens--; | |
93c80368 | 613 | |
b8af0ca5 NB |
614 | arg->count = ntokens; |
615 | arg->first[ntokens] = &pfile->eof; | |
93c80368 | 616 | |
b8af0ca5 NB |
617 | /* Terminate the argument. Excess arguments loop back and |
618 | overwrite the final legitimate argument, before failing. */ | |
619 | if (argc <= macro->paramc) | |
620 | { | |
ece54d54 | 621 | buff->cur = (unsigned char *) &arg->first[ntokens + 1]; |
b8af0ca5 NB |
622 | if (argc != macro->paramc) |
623 | arg++; | |
624 | } | |
93c80368 | 625 | } |
e808ec9c | 626 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
93c80368 | 627 | |
e808ec9c | 628 | if (token->type == CPP_EOF) |
93c80368 | 629 | { |
ece54d54 NB |
630 | /* We still need the CPP_EOF to end directives, and to end |
631 | pre-expansion of a macro argument. Step back is not | |
632 | unconditional, since we don't want to return a CPP_EOF to our | |
633 | callers at the end of an -include-d file. */ | |
e808ec9c | 634 | if (pfile->context->prev || pfile->state.in_directive) |
b8af0ca5 | 635 | _cpp_backup_tokens (pfile, 1); |
0527bc4e | 636 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 637 | "unterminated argument list invoking macro \"%s\"", |
a28c5035 | 638 | NODE_NAME (node)); |
93c80368 | 639 | } |
1ce676a0 | 640 | else |
93c80368 | 641 | { |
1ce676a0 NB |
642 | /* A single empty argument is counted as no argument. */ |
643 | if (argc == 1 && macro->paramc == 0 && args[0].count == 0) | |
644 | argc = 0; | |
645 | if (_cpp_arguments_ok (pfile, macro, node, argc)) | |
58551c23 NB |
646 | { |
647 | /* GCC has special semantics for , ## b where b is a varargs | |
648 | parameter: we remove the comma if b was omitted entirely. | |
649 | If b was merely an empty argument, the comma is retained. | |
650 | If the macro takes just one (varargs) parameter, then we | |
651 | retain the comma only if we are standards conforming. | |
652 | ||
653 | If FIRST is NULL replace_args () swallows the comma. */ | |
654 | if (macro->variadic && (argc < macro->paramc | |
655 | || (argc == 1 && args[0].count == 0 | |
656 | && !CPP_OPTION (pfile, std)))) | |
657 | args[macro->paramc - 1].first = NULL; | |
658 | return base_buff; | |
659 | } | |
93c80368 NB |
660 | } |
661 | ||
1ce676a0 | 662 | /* An error occurred. */ |
b8af0ca5 NB |
663 | _cpp_release_buff (pfile, base_buff); |
664 | return NULL; | |
93c80368 NB |
665 | } |
666 | ||
d6da836d NB |
667 | /* Search for an opening parenthesis to the macro of NODE, in such a |
668 | way that, if none is found, we don't lose the information in any | |
669 | intervening padding tokens. If we find the parenthesis, collect | |
670 | the arguments and return the buffer containing them. */ | |
671 | static _cpp_buff * | |
6cf87ca4 | 672 | funlike_invocation_p (cpp_reader *pfile, cpp_hashnode *node) |
93c80368 | 673 | { |
d6da836d | 674 | const cpp_token *token, *padding = NULL; |
4ed5bcfb | 675 | |
d6da836d | 676 | for (;;) |
bdcbe496 | 677 | { |
d6da836d NB |
678 | token = cpp_get_token (pfile); |
679 | if (token->type != CPP_PADDING) | |
680 | break; | |
681 | if (padding == NULL | |
682 | || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) | |
683 | padding = token; | |
bdcbe496 | 684 | } |
93c80368 | 685 | |
d6da836d | 686 | if (token->type == CPP_OPEN_PAREN) |
93c80368 | 687 | { |
d6da836d NB |
688 | pfile->state.parsing_args = 2; |
689 | return collect_args (pfile, node); | |
93c80368 NB |
690 | } |
691 | ||
9ac3b1be NB |
692 | /* CPP_EOF can be the end of macro arguments, or the end of the |
693 | file. We mustn't back up over the latter. Ugh. */ | |
694 | if (token->type != CPP_EOF || token == &pfile->eof) | |
695 | { | |
696 | /* Back up. We may have skipped padding, in which case backing | |
697 | up more than one token when expanding macros is in general | |
698 | too difficult. We re-insert it in its own context. */ | |
699 | _cpp_backup_tokens (pfile, 1); | |
700 | if (padding) | |
701 | push_token_context (pfile, NULL, padding, 1); | |
702 | } | |
d6da836d NB |
703 | |
704 | return NULL; | |
93c80368 NB |
705 | } |
706 | ||
d15a58c0 NB |
707 | /* Push the context of a macro with hash entry NODE onto the context |
708 | stack. If we can successfully expand the macro, we push a context | |
709 | containing its yet-to-be-rescanned replacement list and return one. | |
710 | Otherwise, we don't push a context and return zero. */ | |
711b8824 | 711 | static int |
6cf87ca4 | 712 | enter_macro_context (cpp_reader *pfile, cpp_hashnode *node) |
711b8824 | 713 | { |
d15a58c0 | 714 | /* The presence of a macro invalidates a file's controlling macro. */ |
644eddaa NB |
715 | pfile->mi_valid = false; |
716 | ||
3620711b NB |
717 | pfile->state.angled_headers = false; |
718 | ||
d15a58c0 | 719 | /* Handle standard macros. */ |
644eddaa | 720 | if (! (node->flags & NODE_BUILTIN)) |
711b8824 | 721 | { |
4ed5bcfb | 722 | cpp_macro *macro = node->value.macro; |
4c2b647d | 723 | |
d6da836d NB |
724 | if (macro->fun_like) |
725 | { | |
726 | _cpp_buff *buff; | |
727 | ||
728 | pfile->state.prevent_expansion++; | |
729 | pfile->keep_tokens++; | |
730 | pfile->state.parsing_args = 1; | |
731 | buff = funlike_invocation_p (pfile, node); | |
732 | pfile->state.parsing_args = 0; | |
733 | pfile->keep_tokens--; | |
734 | pfile->state.prevent_expansion--; | |
735 | ||
736 | if (buff == NULL) | |
737 | { | |
738 | if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr) | |
0527bc4e | 739 | cpp_error (pfile, CPP_DL_WARNING, |
d6da836d | 740 | "function-like macro \"%s\" must be used with arguments in traditional C", |
ebef4e8c | 741 | NODE_NAME (node)); |
d6da836d NB |
742 | |
743 | return 0; | |
744 | } | |
745 | ||
e808ec9c NB |
746 | if (macro->paramc > 0) |
747 | replace_args (pfile, node, macro, (macro_arg *) buff->base); | |
d6da836d NB |
748 | _cpp_release_buff (pfile, buff); |
749 | } | |
93c80368 | 750 | |
4ed5bcfb | 751 | /* Disable the macro within its expansion. */ |
644eddaa | 752 | node->flags |= NODE_DISABLED; |
93c80368 | 753 | |
a69cbaac NB |
754 | macro->used = 1; |
755 | ||
4ed5bcfb | 756 | if (macro->paramc == 0) |
601328bb | 757 | push_token_context (pfile, node, macro->exp.tokens, macro->count); |
644eddaa NB |
758 | |
759 | return 1; | |
711b8824 | 760 | } |
644eddaa | 761 | |
d15a58c0 | 762 | /* Handle built-in macros and the _Pragma operator. */ |
644eddaa | 763 | return builtin_macro (pfile, node); |
93c80368 NB |
764 | } |
765 | ||
d15a58c0 NB |
766 | /* Replace the parameters in a function-like macro of NODE with the |
767 | actual ARGS, and place the result in a newly pushed token context. | |
768 | Expand each argument before replacing, unless it is operated upon | |
769 | by the # or ## operators. */ | |
93c80368 | 770 | static void |
6cf87ca4 | 771 | replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro, macro_arg *args) |
93c80368 NB |
772 | { |
773 | unsigned int i, total; | |
774 | const cpp_token *src, *limit; | |
4ed5bcfb | 775 | const cpp_token **dest, **first; |
93c80368 | 776 | macro_arg *arg; |
1e013d2e | 777 | _cpp_buff *buff; |
93c80368 | 778 | |
93c80368 | 779 | /* First, fully macro-expand arguments, calculating the number of |
1e013d2e NB |
780 | tokens in the final expansion as we go. The ordering of the if |
781 | statements below is subtle; we must handle stringification before | |
782 | pasting. */ | |
4ed5bcfb | 783 | total = macro->count; |
601328bb | 784 | limit = macro->exp.tokens + macro->count; |
4ed5bcfb | 785 | |
601328bb | 786 | for (src = macro->exp.tokens; src < limit; src++) |
93c80368 NB |
787 | if (src->type == CPP_MACRO_ARG) |
788 | { | |
4ed5bcfb NB |
789 | /* Leading and trailing padding tokens. */ |
790 | total += 2; | |
791 | ||
93c80368 NB |
792 | /* We have an argument. If it is not being stringified or |
793 | pasted it is macro-replaced before insertion. */ | |
6c53ebff | 794 | arg = &args[src->val.arg_no - 1]; |
4c2b647d | 795 | |
93c80368 NB |
796 | if (src->flags & STRINGIFY_ARG) |
797 | { | |
798 | if (!arg->stringified) | |
4ed5bcfb | 799 | arg->stringified = stringify_arg (pfile, arg); |
93c80368 NB |
800 | } |
801 | else if ((src->flags & PASTE_LEFT) | |
601328bb | 802 | || (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT))) |
93c80368 NB |
803 | total += arg->count - 1; |
804 | else | |
805 | { | |
806 | if (!arg->expanded) | |
4ed5bcfb | 807 | expand_arg (pfile, arg); |
93c80368 NB |
808 | total += arg->expanded_count - 1; |
809 | } | |
810 | } | |
811 | ||
4ed5bcfb NB |
812 | /* Now allocate space for the expansion, copy the tokens and replace |
813 | the arguments. */ | |
1e013d2e NB |
814 | buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); |
815 | first = (const cpp_token **) buff->base; | |
4ed5bcfb | 816 | dest = first; |
93c80368 | 817 | |
601328bb | 818 | for (src = macro->exp.tokens; src < limit; src++) |
4ed5bcfb NB |
819 | { |
820 | unsigned int count; | |
821 | const cpp_token **from, **paste_flag; | |
93c80368 | 822 | |
4ed5bcfb NB |
823 | if (src->type != CPP_MACRO_ARG) |
824 | { | |
825 | *dest++ = src; | |
826 | continue; | |
827 | } | |
93c80368 | 828 | |
4ed5bcfb NB |
829 | paste_flag = 0; |
830 | arg = &args[src->val.arg_no - 1]; | |
831 | if (src->flags & STRINGIFY_ARG) | |
832 | count = 1, from = &arg->stringified; | |
833 | else if (src->flags & PASTE_LEFT) | |
834 | count = arg->count, from = arg->first; | |
601328bb | 835 | else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)) |
4ed5bcfb NB |
836 | { |
837 | count = arg->count, from = arg->first; | |
838 | if (dest != first) | |
839 | { | |
4ed5bcfb NB |
840 | if (dest[-1]->type == CPP_COMMA |
841 | && macro->variadic | |
842 | && src->val.arg_no == macro->paramc) | |
843 | { | |
58551c23 NB |
844 | /* Swallow a pasted comma if from == NULL, otherwise |
845 | drop the paste flag. */ | |
846 | if (from == NULL) | |
4ed5bcfb NB |
847 | dest--; |
848 | else | |
849 | paste_flag = dest - 1; | |
850 | } | |
851 | /* Remove the paste flag if the RHS is a placemarker. */ | |
852 | else if (count == 0) | |
853 | paste_flag = dest - 1; | |
854 | } | |
855 | } | |
856 | else | |
857 | count = arg->expanded_count, from = arg->expanded; | |
4c2b647d | 858 | |
4ed5bcfb | 859 | /* Padding on the left of an argument (unless RHS of ##). */ |
a8d0ddaf | 860 | if ((!pfile->state.in_directive || pfile->state.directive_wants_padding) |
601328bb | 861 | && src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT)) |
4ed5bcfb | 862 | *dest++ = padding_token (pfile, src); |
93c80368 | 863 | |
4ed5bcfb NB |
864 | if (count) |
865 | { | |
866 | memcpy (dest, from, count * sizeof (cpp_token *)); | |
867 | dest += count; | |
93c80368 | 868 | |
4ed5bcfb NB |
869 | /* With a non-empty argument on the LHS of ##, the last |
870 | token should be flagged PASTE_LEFT. */ | |
871 | if (src->flags & PASTE_LEFT) | |
872 | paste_flag = dest - 1; | |
873 | } | |
26ec42ee | 874 | |
4ed5bcfb NB |
875 | /* Avoid paste on RHS (even case count == 0). */ |
876 | if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) | |
877 | *dest++ = &pfile->avoid_paste; | |
93c80368 | 878 | |
4ed5bcfb NB |
879 | /* Add a new paste flag, or remove an unwanted one. */ |
880 | if (paste_flag) | |
881 | { | |
882 | cpp_token *token = _cpp_temp_token (pfile); | |
883 | token->type = (*paste_flag)->type; | |
884 | token->val.str = (*paste_flag)->val.str; | |
885 | if (src->flags & PASTE_LEFT) | |
886 | token->flags = (*paste_flag)->flags | PASTE_LEFT; | |
887 | else | |
888 | token->flags = (*paste_flag)->flags & ~PASTE_LEFT; | |
889 | *paste_flag = token; | |
890 | } | |
891 | } | |
4c2b647d | 892 | |
93c80368 NB |
893 | /* Free the expanded arguments. */ |
894 | for (i = 0; i < macro->paramc; i++) | |
4ed5bcfb NB |
895 | if (args[i].expanded) |
896 | free (args[i].expanded); | |
897 | ||
644eddaa | 898 | push_ptoken_context (pfile, node, buff, first, dest - first); |
4ed5bcfb NB |
899 | } |
900 | ||
901 | /* Return a special padding token, with padding inherited from SOURCE. */ | |
902 | static const cpp_token * | |
6cf87ca4 | 903 | padding_token (cpp_reader *pfile, const cpp_token *source) |
4ed5bcfb NB |
904 | { |
905 | cpp_token *result = _cpp_temp_token (pfile); | |
906 | ||
907 | result->type = CPP_PADDING; | |
908 | result->val.source = source; | |
909 | result->flags = 0; | |
910 | return result; | |
911 | } | |
912 | ||
d15a58c0 NB |
913 | /* Get a new uninitialized context. Create a new one if we cannot |
914 | re-use an old one. */ | |
4ed5bcfb | 915 | static cpp_context * |
6cf87ca4 | 916 | next_context (cpp_reader *pfile) |
4ed5bcfb NB |
917 | { |
918 | cpp_context *result = pfile->context->next; | |
919 | ||
920 | if (result == 0) | |
711b8824 | 921 | { |
4ed5bcfb NB |
922 | result = xnew (cpp_context); |
923 | result->prev = pfile->context; | |
924 | result->next = 0; | |
925 | pfile->context->next = result; | |
93c80368 | 926 | } |
4ed5bcfb NB |
927 | |
928 | pfile->context = result; | |
929 | return result; | |
93c80368 NB |
930 | } |
931 | ||
4ed5bcfb NB |
932 | /* Push a list of pointers to tokens. */ |
933 | static void | |
6cf87ca4 ZW |
934 | push_ptoken_context (cpp_reader *pfile, cpp_hashnode *macro, _cpp_buff *buff, |
935 | const cpp_token **first, unsigned int count) | |
93c80368 NB |
936 | { |
937 | cpp_context *context = next_context (pfile); | |
93c80368 | 938 | |
4ed5bcfb NB |
939 | context->direct_p = false; |
940 | context->macro = macro; | |
1e013d2e | 941 | context->buff = buff; |
82eda77e NB |
942 | FIRST (context).ptoken = first; |
943 | LAST (context).ptoken = first + count; | |
4ed5bcfb NB |
944 | } |
945 | ||
946 | /* Push a list of tokens. */ | |
947 | static void | |
6cf87ca4 ZW |
948 | push_token_context (cpp_reader *pfile, cpp_hashnode *macro, |
949 | const cpp_token *first, unsigned int count) | |
4ed5bcfb NB |
950 | { |
951 | cpp_context *context = next_context (pfile); | |
952 | ||
953 | context->direct_p = true; | |
954 | context->macro = macro; | |
1e013d2e | 955 | context->buff = NULL; |
82eda77e NB |
956 | FIRST (context).token = first; |
957 | LAST (context).token = first + count; | |
93c80368 NB |
958 | } |
959 | ||
cbc69f84 NB |
960 | /* Push a traditional macro's replacement text. */ |
961 | void | |
6cf87ca4 ZW |
962 | _cpp_push_text_context (cpp_reader *pfile, cpp_hashnode *macro, |
963 | const uchar *start, size_t len) | |
cbc69f84 NB |
964 | { |
965 | cpp_context *context = next_context (pfile); | |
966 | ||
967 | context->direct_p = true; | |
968 | context->macro = macro; | |
969 | context->buff = NULL; | |
970 | CUR (context) = start; | |
1ce676a0 | 971 | RLIMIT (context) = start + len; |
974c43f1 | 972 | macro->flags |= NODE_DISABLED; |
cbc69f84 NB |
973 | } |
974 | ||
d15a58c0 NB |
975 | /* Expand an argument ARG before replacing parameters in a |
976 | function-like macro. This works by pushing a context with the | |
977 | argument's tokens, and then expanding that into a temporary buffer | |
978 | as if it were a normal part of the token stream. collect_args() | |
979 | has terminated the argument's tokens with a CPP_EOF so that we know | |
980 | when we have fully expanded the argument. */ | |
93c80368 | 981 | static void |
6cf87ca4 | 982 | expand_arg (cpp_reader *pfile, macro_arg *arg) |
93c80368 | 983 | { |
4ed5bcfb | 984 | unsigned int capacity; |
56941bf2 | 985 | bool saved_warn_trad; |
4ed5bcfb | 986 | |
4ed5bcfb NB |
987 | if (arg->count == 0) |
988 | return; | |
93c80368 | 989 | |
56941bf2 NB |
990 | /* Don't warn about funlike macros when pre-expanding. */ |
991 | saved_warn_trad = CPP_WTRADITIONAL (pfile); | |
992 | CPP_WTRADITIONAL (pfile) = 0; | |
993 | ||
93c80368 | 994 | /* Loop, reading in the arguments. */ |
4ed5bcfb | 995 | capacity = 256; |
703ad42b | 996 | arg->expanded = xmalloc (capacity * sizeof (cpp_token *)); |
93c80368 | 997 | |
1e013d2e | 998 | push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); |
4ed5bcfb | 999 | for (;;) |
93c80368 | 1000 | { |
4ed5bcfb NB |
1001 | const cpp_token *token; |
1002 | ||
1003 | if (arg->expanded_count + 1 >= capacity) | |
711b8824 | 1004 | { |
93c80368 | 1005 | capacity *= 2; |
703ad42b KG |
1006 | arg->expanded = xrealloc (arg->expanded, |
1007 | capacity * sizeof (cpp_token *)); | |
93c80368 | 1008 | } |
93c80368 | 1009 | |
4ed5bcfb | 1010 | token = cpp_get_token (pfile); |
93c80368 | 1011 | |
4ed5bcfb NB |
1012 | if (token->type == CPP_EOF) |
1013 | break; | |
1014 | ||
1015 | arg->expanded[arg->expanded_count++] = token; | |
1016 | } | |
1017 | ||
1e013d2e | 1018 | _cpp_pop_context (pfile); |
56941bf2 NB |
1019 | |
1020 | CPP_WTRADITIONAL (pfile) = saved_warn_trad; | |
93c80368 NB |
1021 | } |
1022 | ||
d15a58c0 NB |
1023 | /* Pop the current context off the stack, re-enabling the macro if the |
1024 | context represented a macro's replacement list. The context | |
1025 | structure is not freed so that we can re-use it later. */ | |
93c80368 | 1026 | void |
6cf87ca4 | 1027 | _cpp_pop_context (cpp_reader *pfile) |
93c80368 | 1028 | { |
1e013d2e NB |
1029 | cpp_context *context = pfile->context; |
1030 | ||
1e013d2e | 1031 | if (context->macro) |
644eddaa | 1032 | context->macro->flags &= ~NODE_DISABLED; |
1e013d2e NB |
1033 | |
1034 | if (context->buff) | |
1035 | _cpp_release_buff (pfile, context->buff); | |
93c80368 | 1036 | |
1e013d2e | 1037 | pfile->context = context->prev; |
93c80368 NB |
1038 | } |
1039 | ||
48c4721e | 1040 | /* External routine to get a token. Also used nearly everywhere |
7f2f1a66 | 1041 | internally, except for places where we know we can safely call |
48c4721e | 1042 | _cpp_lex_token directly, such as lexing a directive name. |
7f2f1a66 NB |
1043 | |
1044 | Macro expansions and directives are transparently handled, | |
1045 | including entering included files. Thus tokens are post-macro | |
1046 | expansion, and after any intervening directives. External callers | |
1047 | see CPP_EOF only at EOF. Internal callers also see it when meeting | |
1048 | a directive inside a macro call, when at the end of a directive and | |
1049 | state.in_directive is still 1, and at the end of argument | |
1050 | pre-expansion. */ | |
4ed5bcfb | 1051 | const cpp_token * |
6cf87ca4 | 1052 | cpp_get_token (cpp_reader *pfile) |
93c80368 | 1053 | { |
4ed5bcfb NB |
1054 | const cpp_token *result; |
1055 | ||
29b10746 | 1056 | for (;;) |
93c80368 | 1057 | { |
4ed5bcfb | 1058 | cpp_hashnode *node; |
93c80368 NB |
1059 | cpp_context *context = pfile->context; |
1060 | ||
93c80368 | 1061 | /* Context->prev == 0 <=> base context. */ |
bdcbe496 | 1062 | if (!context->prev) |
4ed5bcfb | 1063 | result = _cpp_lex_token (pfile); |
82eda77e | 1064 | else if (FIRST (context).token != LAST (context).token) |
29b10746 | 1065 | { |
4ed5bcfb | 1066 | if (context->direct_p) |
82eda77e | 1067 | result = FIRST (context).token++; |
4ed5bcfb | 1068 | else |
82eda77e | 1069 | result = *FIRST (context).ptoken++; |
4ed5bcfb NB |
1070 | |
1071 | if (result->flags & PASTE_LEFT) | |
ec1a23e6 | 1072 | { |
4ed5bcfb NB |
1073 | paste_all_tokens (pfile, result); |
1074 | if (pfile->state.in_directive) | |
1075 | continue; | |
1076 | return padding_token (pfile, result); | |
ec1a23e6 | 1077 | } |
29b10746 | 1078 | } |
93c80368 NB |
1079 | else |
1080 | { | |
bdcbe496 | 1081 | _cpp_pop_context (pfile); |
4ed5bcfb NB |
1082 | if (pfile->state.in_directive) |
1083 | continue; | |
1084 | return &pfile->avoid_paste; | |
93c80368 | 1085 | } |
93c80368 | 1086 | |
477cdac7 JT |
1087 | if (pfile->state.in_directive && result->type == CPP_COMMENT) |
1088 | continue; | |
1089 | ||
4ed5bcfb | 1090 | if (result->type != CPP_NAME) |
93c80368 NB |
1091 | break; |
1092 | ||
4ed5bcfb NB |
1093 | node = result->val.node; |
1094 | ||
644eddaa NB |
1095 | if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) |
1096 | break; | |
df383483 | 1097 | |
644eddaa | 1098 | if (!(node->flags & NODE_DISABLED)) |
93c80368 | 1099 | { |
644eddaa NB |
1100 | if (!pfile->state.prevent_expansion |
1101 | && enter_macro_context (pfile, node)) | |
bd969772 | 1102 | { |
4ed5bcfb NB |
1103 | if (pfile->state.in_directive) |
1104 | continue; | |
1105 | return padding_token (pfile, result); | |
bd969772 | 1106 | } |
93c80368 | 1107 | } |
644eddaa NB |
1108 | else |
1109 | { | |
d15a58c0 NB |
1110 | /* Flag this token as always unexpandable. FIXME: move this |
1111 | to collect_args()?. */ | |
644eddaa NB |
1112 | cpp_token *t = _cpp_temp_token (pfile); |
1113 | t->type = result->type; | |
1114 | t->flags = result->flags | NO_EXPAND; | |
1115 | t->val.str = result->val.str; | |
1116 | result = t; | |
1117 | } | |
a5c3cccd | 1118 | |
644eddaa | 1119 | break; |
93c80368 | 1120 | } |
4ed5bcfb NB |
1121 | |
1122 | return result; | |
93c80368 NB |
1123 | } |
1124 | ||
7065e130 NB |
1125 | /* Returns true if we're expanding an object-like macro that was |
1126 | defined in a system header. Just checks the macro at the top of | |
1127 | the stack. Used for diagnostic suppression. */ | |
1128 | int | |
6cf87ca4 | 1129 | cpp_sys_macro_p (cpp_reader *pfile) |
7065e130 | 1130 | { |
644eddaa | 1131 | cpp_hashnode *node = pfile->context->macro; |
7065e130 | 1132 | |
644eddaa | 1133 | return node && node->value.macro && node->value.macro->syshdr; |
7065e130 NB |
1134 | } |
1135 | ||
af0d16cd NB |
1136 | /* Read each token in, until end of the current file. Directives are |
1137 | transparently processed. */ | |
93c80368 | 1138 | void |
6cf87ca4 | 1139 | cpp_scan_nooutput (cpp_reader *pfile) |
93c80368 | 1140 | { |
22234f56 PB |
1141 | /* Request a CPP_EOF token at the end of this file, rather than |
1142 | transparently continuing with the including file. */ | |
1143 | pfile->buffer->return_at_eof = true; | |
1144 | ||
590e1987 NB |
1145 | if (CPP_OPTION (pfile, traditional)) |
1146 | while (_cpp_read_logical_line_trad (pfile)) | |
1147 | ; | |
1148 | else | |
1149 | while (cpp_get_token (pfile)->type != CPP_EOF) | |
1150 | ; | |
93c80368 NB |
1151 | } |
1152 | ||
bdcbe496 NB |
1153 | /* Step back one (or more) tokens. Can only step mack more than 1 if |
1154 | they are from the lexer, and not from macro expansion. */ | |
b528a07e | 1155 | void |
6cf87ca4 | 1156 | _cpp_backup_tokens (cpp_reader *pfile, unsigned int count) |
93c80368 | 1157 | { |
bdcbe496 | 1158 | if (pfile->context->prev == NULL) |
93c80368 | 1159 | { |
bdcbe496 NB |
1160 | pfile->lookaheads += count; |
1161 | while (count--) | |
1162 | { | |
3293c3e3 NB |
1163 | pfile->cur_token--; |
1164 | if (pfile->cur_token == pfile->cur_run->base | |
1165 | /* Possible with -fpreprocessed and no leading #line. */ | |
1166 | && pfile->cur_run->prev != NULL) | |
bdcbe496 | 1167 | { |
bdcbe496 NB |
1168 | pfile->cur_run = pfile->cur_run->prev; |
1169 | pfile->cur_token = pfile->cur_run->limit; | |
1170 | } | |
1171 | } | |
93c80368 | 1172 | } |
bdcbe496 | 1173 | else |
93c80368 | 1174 | { |
bdcbe496 NB |
1175 | if (count != 1) |
1176 | abort (); | |
4ed5bcfb | 1177 | if (pfile->context->direct_p) |
82eda77e | 1178 | FIRST (pfile->context).token--; |
4ed5bcfb | 1179 | else |
82eda77e | 1180 | FIRST (pfile->context).ptoken--; |
93c80368 NB |
1181 | } |
1182 | } | |
711b8824 | 1183 | |
93c80368 NB |
1184 | /* #define directive parsing and handling. */ |
1185 | ||
da7d8304 | 1186 | /* Returns nonzero if a macro redefinition warning is required. */ |
cbc69f84 | 1187 | static bool |
6cf87ca4 ZW |
1188 | warn_of_redefinition (cpp_reader *pfile, const cpp_hashnode *node, |
1189 | const cpp_macro *macro2) | |
93c80368 NB |
1190 | { |
1191 | const cpp_macro *macro1; | |
1192 | unsigned int i; | |
1193 | ||
618cdda7 NB |
1194 | /* Some redefinitions need to be warned about regardless. */ |
1195 | if (node->flags & NODE_WARN) | |
cbc69f84 | 1196 | return true; |
93c80368 | 1197 | |
618cdda7 | 1198 | /* Redefinition of a macro is allowed if and only if the old and new |
ec5c56db | 1199 | definitions are the same. (6.10.3 paragraph 2). */ |
93c80368 NB |
1200 | macro1 = node->value.macro; |
1201 | ||
6618c5d4 NB |
1202 | /* Don't check count here as it can be different in valid |
1203 | traditional redefinitions with just whitespace differences. */ | |
1204 | if (macro1->paramc != macro2->paramc | |
93c80368 | 1205 | || macro1->fun_like != macro2->fun_like |
28e0f040 | 1206 | || macro1->variadic != macro2->variadic) |
cbc69f84 | 1207 | return true; |
93c80368 NB |
1208 | |
1209 | /* Check parameter spellings. */ | |
1210 | for (i = 0; i < macro1->paramc; i++) | |
1211 | if (macro1->params[i] != macro2->params[i]) | |
cbc69f84 | 1212 | return true; |
93c80368 | 1213 | |
cbc69f84 NB |
1214 | /* Check the replacement text or tokens. */ |
1215 | if (CPP_OPTION (pfile, traditional)) | |
6618c5d4 | 1216 | return _cpp_expansions_different_trad (macro1, macro2); |
cbc69f84 | 1217 | |
a7f36da3 DD |
1218 | if (macro1->count != macro2->count) |
1219 | return true; | |
1220 | ||
1221 | for (i = 0; i < macro1->count; i++) | |
1222 | if (!_cpp_equiv_tokens (¯o1->exp.tokens[i], ¯o2->exp.tokens[i])) | |
1223 | return true; | |
cbc69f84 NB |
1224 | |
1225 | return false; | |
93c80368 NB |
1226 | } |
1227 | ||
1228 | /* Free the definition of hashnode H. */ | |
711b8824 | 1229 | void |
6cf87ca4 | 1230 | _cpp_free_definition (cpp_hashnode *h) |
711b8824 | 1231 | { |
93c80368 NB |
1232 | /* Macros and assertions no longer have anything to free. */ |
1233 | h->type = NT_VOID; | |
1234 | /* Clear builtin flag in case of redefinition. */ | |
644eddaa | 1235 | h->flags &= ~(NODE_BUILTIN | NODE_DISABLED); |
93c80368 NB |
1236 | } |
1237 | ||
14baae01 | 1238 | /* Save parameter NODE to the parameter list of macro MACRO. Returns |
da7d8304 | 1239 | zero on success, nonzero if the parameter is a duplicate. */ |
c70f6ed3 | 1240 | bool |
6cf87ca4 | 1241 | _cpp_save_parameter (cpp_reader *pfile, cpp_macro *macro, cpp_hashnode *node) |
93c80368 | 1242 | { |
4977bab6 | 1243 | unsigned int len; |
93c80368 | 1244 | /* Constraint 6.10.3.6 - duplicate parameter names. */ |
4977bab6 | 1245 | if (node->flags & NODE_MACRO_ARG) |
709e9e50 | 1246 | { |
0527bc4e | 1247 | cpp_error (pfile, CPP_DL_ERROR, "duplicate macro parameter \"%s\"", |
ebef4e8c | 1248 | NODE_NAME (node)); |
23ff0223 | 1249 | return true; |
93c80368 | 1250 | } |
709e9e50 | 1251 | |
8c3b2693 NB |
1252 | if (BUFF_ROOM (pfile->a_buff) |
1253 | < (macro->paramc + 1) * sizeof (cpp_hashnode *)) | |
1254 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); | |
709e9e50 | 1255 | |
8c3b2693 | 1256 | ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; |
4977bab6 ZW |
1257 | node->flags |= NODE_MACRO_ARG; |
1258 | len = macro->paramc * sizeof (union _cpp_hashnode_value); | |
1259 | if (len > pfile->macro_buffer_len) | |
1260 | { | |
703ad42b | 1261 | pfile->macro_buffer = xrealloc (pfile->macro_buffer, len); |
4977bab6 ZW |
1262 | pfile->macro_buffer_len = len; |
1263 | } | |
1264 | ((union _cpp_hashnode_value *) pfile->macro_buffer)[macro->paramc - 1] | |
1265 | = node->value; | |
1266 | ||
1267 | node->value.arg_index = macro->paramc; | |
23ff0223 | 1268 | return false; |
711b8824 ZW |
1269 | } |
1270 | ||
23ff0223 NB |
1271 | /* Check the syntax of the parameters in a MACRO definition. Returns |
1272 | false if an error occurs. */ | |
1273 | static bool | |
6cf87ca4 | 1274 | parse_params (cpp_reader *pfile, cpp_macro *macro) |
711b8824 | 1275 | { |
93c80368 | 1276 | unsigned int prev_ident = 0; |
711b8824 | 1277 | |
93c80368 | 1278 | for (;;) |
711b8824 | 1279 | { |
345894b4 | 1280 | const cpp_token *token = _cpp_lex_token (pfile); |
711b8824 | 1281 | |
345894b4 | 1282 | switch (token->type) |
711b8824 | 1283 | { |
93c80368 | 1284 | default: |
477cdac7 JT |
1285 | /* Allow/ignore comments in parameter lists if we are |
1286 | preserving comments in macro expansions. */ | |
1287 | if (token->type == CPP_COMMENT | |
1288 | && ! CPP_OPTION (pfile, discard_comments_in_macro_exp)) | |
1289 | continue; | |
1290 | ||
0527bc4e | 1291 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1292 | "\"%s\" may not appear in macro parameter list", |
345894b4 | 1293 | cpp_token_as_text (pfile, token)); |
23ff0223 | 1294 | return false; |
93c80368 | 1295 | |
711b8824 | 1296 | case CPP_NAME: |
93c80368 NB |
1297 | if (prev_ident) |
1298 | { | |
0527bc4e | 1299 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1300 | "macro parameters must be comma-separated"); |
23ff0223 | 1301 | return false; |
93c80368 NB |
1302 | } |
1303 | prev_ident = 1; | |
1304 | ||
c70f6ed3 | 1305 | if (_cpp_save_parameter (pfile, macro, token->val.node)) |
23ff0223 | 1306 | return false; |
93c80368 | 1307 | continue; |
711b8824 | 1308 | |
93c80368 NB |
1309 | case CPP_CLOSE_PAREN: |
1310 | if (prev_ident || macro->paramc == 0) | |
23ff0223 | 1311 | return true; |
711b8824 | 1312 | |
93c80368 NB |
1313 | /* Fall through to pick up the error. */ |
1314 | case CPP_COMMA: | |
1315 | if (!prev_ident) | |
1316 | { | |
0527bc4e | 1317 | cpp_error (pfile, CPP_DL_ERROR, "parameter name missing"); |
23ff0223 | 1318 | return false; |
93c80368 NB |
1319 | } |
1320 | prev_ident = 0; | |
711b8824 ZW |
1321 | continue; |
1322 | ||
93c80368 | 1323 | case CPP_ELLIPSIS: |
28e0f040 | 1324 | macro->variadic = 1; |
93c80368 NB |
1325 | if (!prev_ident) |
1326 | { | |
c70f6ed3 NB |
1327 | _cpp_save_parameter (pfile, macro, |
1328 | pfile->spec_nodes.n__VA_ARGS__); | |
93c80368 | 1329 | pfile->state.va_args_ok = 1; |
e5b79219 RH |
1330 | if (! CPP_OPTION (pfile, c99) |
1331 | && CPP_OPTION (pfile, pedantic) | |
1332 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
0527bc4e | 1333 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebef4e8c | 1334 | "anonymous variadic macros were introduced in C99"); |
93c80368 | 1335 | } |
e5b79219 RH |
1336 | else if (CPP_OPTION (pfile, pedantic) |
1337 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
0527bc4e | 1338 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebef4e8c | 1339 | "ISO C does not permit named variadic macros"); |
711b8824 | 1340 | |
93c80368 | 1341 | /* We're at the end, and just expect a closing parenthesis. */ |
345894b4 NB |
1342 | token = _cpp_lex_token (pfile); |
1343 | if (token->type == CPP_CLOSE_PAREN) | |
23ff0223 | 1344 | return true; |
93c80368 | 1345 | /* Fall through. */ |
711b8824 | 1346 | |
93c80368 | 1347 | case CPP_EOF: |
0527bc4e | 1348 | cpp_error (pfile, CPP_DL_ERROR, "missing ')' in macro parameter list"); |
23ff0223 | 1349 | return false; |
711b8824 | 1350 | } |
711b8824 | 1351 | } |
93c80368 NB |
1352 | } |
1353 | ||
14baae01 | 1354 | /* Allocate room for a token from a macro's replacement list. */ |
93c80368 | 1355 | static cpp_token * |
6cf87ca4 | 1356 | alloc_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
93c80368 | 1357 | { |
8c3b2693 NB |
1358 | if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) |
1359 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); | |
711b8824 | 1360 | |
8c3b2693 | 1361 | return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; |
14baae01 NB |
1362 | } |
1363 | ||
d15a58c0 NB |
1364 | /* Lex a token from the expansion of MACRO, but mark parameters as we |
1365 | find them and warn of traditional stringification. */ | |
14baae01 | 1366 | static cpp_token * |
6cf87ca4 | 1367 | lex_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
14baae01 NB |
1368 | { |
1369 | cpp_token *token; | |
1370 | ||
1371 | pfile->cur_token = alloc_expansion_token (pfile, macro); | |
1372 | token = _cpp_lex_direct (pfile); | |
93c80368 | 1373 | |
d15a58c0 | 1374 | /* Is this a parameter? */ |
4977bab6 ZW |
1375 | if (token->type == CPP_NAME |
1376 | && (token->val.node->flags & NODE_MACRO_ARG) != 0) | |
93c80368 NB |
1377 | { |
1378 | token->type = CPP_MACRO_ARG; | |
4977bab6 | 1379 | token->val.arg_no = token->val.node->value.arg_index; |
93c80368 NB |
1380 | } |
1381 | else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 | |
1382 | && (token->type == CPP_STRING || token->type == CPP_CHAR)) | |
1383 | check_trad_stringification (pfile, macro, &token->val.str); | |
1384 | ||
1385 | return token; | |
711b8824 ZW |
1386 | } |
1387 | ||
cbc69f84 | 1388 | static bool |
6cf87ca4 | 1389 | create_iso_definition (cpp_reader *pfile, cpp_macro *macro) |
711b8824 | 1390 | { |
cbc69f84 | 1391 | cpp_token *token; |
14baae01 | 1392 | const cpp_token *ctoken; |
93c80368 NB |
1393 | |
1394 | /* Get the first token of the expansion (or the '(' of a | |
1395 | function-like macro). */ | |
14baae01 NB |
1396 | ctoken = _cpp_lex_token (pfile); |
1397 | ||
1398 | if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) | |
93c80368 | 1399 | { |
cbc69f84 | 1400 | bool ok = parse_params (pfile, macro); |
8c3b2693 NB |
1401 | macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); |
1402 | if (!ok) | |
cbc69f84 | 1403 | return false; |
8c3b2693 NB |
1404 | |
1405 | /* Success. Commit the parameter array. */ | |
562a5c27 | 1406 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->params[macro->paramc]; |
93c80368 | 1407 | macro->fun_like = 1; |
93c80368 | 1408 | } |
14baae01 | 1409 | else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) |
0527bc4e | 1410 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebef4e8c | 1411 | "ISO C requires whitespace after the macro name"); |
711b8824 | 1412 | |
14baae01 NB |
1413 | if (macro->fun_like) |
1414 | token = lex_expansion_token (pfile, macro); | |
1415 | else | |
1416 | { | |
1417 | token = alloc_expansion_token (pfile, macro); | |
1418 | *token = *ctoken; | |
1419 | } | |
711b8824 | 1420 | |
93c80368 NB |
1421 | for (;;) |
1422 | { | |
1423 | /* Check the stringifying # constraint 6.10.3.2.1 of | |
1424 | function-like macros when lexing the subsequent token. */ | |
1425 | if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) | |
1426 | { | |
1427 | if (token->type == CPP_MACRO_ARG) | |
1428 | { | |
1429 | token->flags &= ~PREV_WHITE; | |
1430 | token->flags |= STRINGIFY_ARG; | |
1431 | token->flags |= token[-1].flags & PREV_WHITE; | |
1432 | token[-1] = token[0]; | |
1433 | macro->count--; | |
1434 | } | |
1435 | /* Let assembler get away with murder. */ | |
bdb05a7b | 1436 | else if (CPP_OPTION (pfile, lang) != CLK_ASM) |
93c80368 | 1437 | { |
0527bc4e | 1438 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1439 | "'#' is not followed by a macro parameter"); |
cbc69f84 | 1440 | return false; |
93c80368 NB |
1441 | } |
1442 | } | |
1443 | ||
1444 | if (token->type == CPP_EOF) | |
1445 | break; | |
1446 | ||
1447 | /* Paste operator constraint 6.10.3.3.1. */ | |
1448 | if (token->type == CPP_PASTE) | |
1449 | { | |
1450 | /* Token-paste ##, can appear in both object-like and | |
1451 | function-like macros, but not at the ends. */ | |
1452 | if (--macro->count > 0) | |
1453 | token = lex_expansion_token (pfile, macro); | |
1454 | ||
1455 | if (macro->count == 0 || token->type == CPP_EOF) | |
1456 | { | |
0527bc4e | 1457 | cpp_error (pfile, CPP_DL_ERROR, |
6cf87ca4 | 1458 | "'##' cannot appear at either end of a macro expansion"); |
cbc69f84 | 1459 | return false; |
93c80368 | 1460 | } |
711b8824 | 1461 | |
93c80368 | 1462 | token[-1].flags |= PASTE_LEFT; |
93c80368 NB |
1463 | } |
1464 | ||
1465 | token = lex_expansion_token (pfile, macro); | |
1466 | } | |
1467 | ||
601328bb | 1468 | macro->exp.tokens = (cpp_token *) BUFF_FRONT (pfile->a_buff); |
8c3b2693 | 1469 | |
4c2b647d NB |
1470 | /* Don't count the CPP_EOF. */ |
1471 | macro->count--; | |
93c80368 | 1472 | |
d15a58c0 | 1473 | /* Clear whitespace on first token for warn_of_redefinition(). */ |
8c3b2693 | 1474 | if (macro->count) |
601328bb | 1475 | macro->exp.tokens[0].flags &= ~PREV_WHITE; |
8c3b2693 NB |
1476 | |
1477 | /* Commit the memory. */ | |
601328bb | 1478 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->exp.tokens[macro->count]; |
8c3b2693 | 1479 | |
cbc69f84 NB |
1480 | return true; |
1481 | } | |
1482 | ||
da7d8304 | 1483 | /* Parse a macro and save its expansion. Returns nonzero on success. */ |
cbc69f84 | 1484 | bool |
6cf87ca4 | 1485 | _cpp_create_definition (cpp_reader *pfile, cpp_hashnode *node) |
cbc69f84 NB |
1486 | { |
1487 | cpp_macro *macro; | |
1488 | unsigned int i; | |
1489 | bool ok; | |
44ed91a1 | 1490 | |
cbc69f84 NB |
1491 | macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); |
1492 | macro->line = pfile->directive_line; | |
1493 | macro->params = 0; | |
1494 | macro->paramc = 0; | |
1495 | macro->variadic = 0; | |
23345bbb | 1496 | macro->used = !CPP_OPTION (pfile, warn_unused_macros); |
cbc69f84 NB |
1497 | macro->count = 0; |
1498 | macro->fun_like = 0; | |
7065e130 | 1499 | /* To suppress some diagnostics. */ |
12f9df4e | 1500 | macro->syshdr = pfile->buffer && pfile->buffer->sysp != 0; |
7065e130 | 1501 | |
cbc69f84 NB |
1502 | if (CPP_OPTION (pfile, traditional)) |
1503 | ok = _cpp_create_trad_definition (pfile, macro); | |
1504 | else | |
1505 | { | |
1506 | cpp_token *saved_cur_token = pfile->cur_token; | |
1507 | ||
1508 | ok = create_iso_definition (pfile, macro); | |
1509 | ||
1510 | /* Restore lexer position because of games lex_expansion_token() | |
1511 | plays lexing the macro. We set the type for SEEN_EOL() in | |
1512 | cpplib.c. | |
1513 | ||
1514 | Longer term we should lex the whole line before coming here, | |
1515 | and just copy the expansion. */ | |
1516 | saved_cur_token[-1].type = pfile->cur_token[-1].type; | |
1517 | pfile->cur_token = saved_cur_token; | |
1518 | ||
1519 | /* Stop the lexer accepting __VA_ARGS__. */ | |
1520 | pfile->state.va_args_ok = 0; | |
1521 | } | |
1522 | ||
1523 | /* Clear the fast argument lookup indices. */ | |
1524 | for (i = macro->paramc; i-- > 0; ) | |
4977bab6 ZW |
1525 | { |
1526 | struct cpp_hashnode *node = macro->params[i]; | |
1527 | node->flags &= ~ NODE_MACRO_ARG; | |
1528 | node->value = ((union _cpp_hashnode_value *) pfile->macro_buffer)[i]; | |
1529 | } | |
cbc69f84 NB |
1530 | |
1531 | if (!ok) | |
1532 | return ok; | |
1533 | ||
c2734e05 | 1534 | if (node->type == NT_MACRO) |
711b8824 | 1535 | { |
a69cbaac NB |
1536 | if (CPP_OPTION (pfile, warn_unused_macros)) |
1537 | _cpp_warn_if_unused_macro (pfile, node, NULL); | |
1538 | ||
cbc69f84 | 1539 | if (warn_of_redefinition (pfile, node, macro)) |
711b8824 | 1540 | { |
0527bc4e | 1541 | cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->directive_line, 0, |
ebef4e8c | 1542 | "\"%s\" redefined", NODE_NAME (node)); |
93c80368 | 1543 | |
618cdda7 | 1544 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) |
0527bc4e | 1545 | cpp_error_with_line (pfile, CPP_DL_PEDWARN, |
cbc69f84 NB |
1546 | node->value.macro->line, 0, |
1547 | "this is the location of the previous definition"); | |
711b8824 | 1548 | } |
711b8824 ZW |
1549 | } |
1550 | ||
c2734e05 NB |
1551 | if (node->type != NT_VOID) |
1552 | _cpp_free_definition (node); | |
1553 | ||
711b8824 | 1554 | /* Enter definition in hash table. */ |
93c80368 NB |
1555 | node->type = NT_MACRO; |
1556 | node->value.macro = macro; | |
a28c5035 | 1557 | if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_"))) |
618cdda7 | 1558 | node->flags |= NODE_WARN; |
711b8824 | 1559 | |
93c80368 | 1560 | return ok; |
711b8824 ZW |
1561 | } |
1562 | ||
d15a58c0 NB |
1563 | /* Warn if a token in STRING matches one of a function-like MACRO's |
1564 | parameters. */ | |
e1aa5140 | 1565 | static void |
6cf87ca4 ZW |
1566 | check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro, |
1567 | const cpp_string *string) | |
e1aa5140 | 1568 | { |
93c80368 | 1569 | unsigned int i, len; |
6338b358 | 1570 | const uchar *p, *q, *limit; |
df383483 | 1571 | |
e1aa5140 | 1572 | /* Loop over the string. */ |
6338b358 NB |
1573 | limit = string->text + string->len - 1; |
1574 | for (p = string->text + 1; p < limit; p = q) | |
e1aa5140 | 1575 | { |
e1aa5140 | 1576 | /* Find the start of an identifier. */ |
61c16b10 GM |
1577 | while (p < limit && !is_idstart (*p)) |
1578 | p++; | |
e1aa5140 KG |
1579 | |
1580 | /* Find the end of the identifier. */ | |
1581 | q = p; | |
61c16b10 GM |
1582 | while (q < limit && is_idchar (*q)) |
1583 | q++; | |
93c80368 NB |
1584 | |
1585 | len = q - p; | |
1586 | ||
e1aa5140 KG |
1587 | /* Loop over the function macro arguments to see if the |
1588 | identifier inside the string matches one of them. */ | |
93c80368 NB |
1589 | for (i = 0; i < macro->paramc; i++) |
1590 | { | |
1591 | const cpp_hashnode *node = macro->params[i]; | |
e1aa5140 | 1592 | |
2a967f3d NB |
1593 | if (NODE_LEN (node) == len |
1594 | && !memcmp (p, NODE_NAME (node), len)) | |
e1aa5140 | 1595 | { |
0527bc4e | 1596 | cpp_error (pfile, CPP_DL_WARNING, |
f458d1d5 | 1597 | "macro argument \"%s\" would be stringified in traditional C", |
ebef4e8c | 1598 | NODE_NAME (node)); |
e1aa5140 KG |
1599 | break; |
1600 | } | |
1601 | } | |
1602 | } | |
1603 | } | |
93c80368 | 1604 | |
7096171b NB |
1605 | /* Returns the name, arguments and expansion of a macro, in a format |
1606 | suitable to be read back in again, and therefore also for DWARF 2 | |
1607 | debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". | |
1608 | Caller is expected to generate the "#define" bit if needed. The | |
93c80368 | 1609 | returned text is temporary, and automatically freed later. */ |
93c80368 | 1610 | const unsigned char * |
6cf87ca4 | 1611 | cpp_macro_definition (cpp_reader *pfile, const cpp_hashnode *node) |
93c80368 NB |
1612 | { |
1613 | unsigned int i, len; | |
1614 | const cpp_macro *macro = node->value.macro; | |
1615 | unsigned char *buffer; | |
1616 | ||
1617 | if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) | |
1618 | { | |
0527bc4e | 1619 | cpp_error (pfile, CPP_DL_ICE, |
ebef4e8c | 1620 | "invalid hash type %d in cpp_macro_definition", node->type); |
93c80368 NB |
1621 | return 0; |
1622 | } | |
1623 | ||
1624 | /* Calculate length. */ | |
8dc901de | 1625 | len = NODE_LEN (node) + 2; /* ' ' and NUL. */ |
93c80368 NB |
1626 | if (macro->fun_like) |
1627 | { | |
64d08263 JB |
1628 | len += 4; /* "()" plus possible final ".." of named |
1629 | varargs (we have + 1 below). */ | |
93c80368 | 1630 | for (i = 0; i < macro->paramc; i++) |
64d08263 | 1631 | len += NODE_LEN (macro->params[i]) + 1; /* "," */ |
93c80368 NB |
1632 | } |
1633 | ||
278c4662 NB |
1634 | if (CPP_OPTION (pfile, traditional)) |
1635 | len += _cpp_replacement_text_len (macro); | |
1636 | else | |
93c80368 | 1637 | { |
278c4662 NB |
1638 | for (i = 0; i < macro->count; i++) |
1639 | { | |
1640 | cpp_token *token = ¯o->exp.tokens[i]; | |
93c80368 | 1641 | |
278c4662 NB |
1642 | if (token->type == CPP_MACRO_ARG) |
1643 | len += NODE_LEN (macro->params[token->val.arg_no - 1]); | |
1644 | else | |
59325650 | 1645 | len += cpp_token_len (token) + 1; /* Includes room for ' '. */ |
278c4662 NB |
1646 | if (token->flags & STRINGIFY_ARG) |
1647 | len++; /* "#" */ | |
1648 | if (token->flags & PASTE_LEFT) | |
1649 | len += 3; /* " ##" */ | |
1650 | } | |
93c80368 NB |
1651 | } |
1652 | ||
1653 | if (len > pfile->macro_buffer_len) | |
4b49c365 | 1654 | { |
703ad42b | 1655 | pfile->macro_buffer = xrealloc (pfile->macro_buffer, len); |
4b49c365 AO |
1656 | pfile->macro_buffer_len = len; |
1657 | } | |
7096171b NB |
1658 | |
1659 | /* Fill in the buffer. Start with the macro name. */ | |
93c80368 | 1660 | buffer = pfile->macro_buffer; |
7096171b NB |
1661 | memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); |
1662 | buffer += NODE_LEN (node); | |
93c80368 NB |
1663 | |
1664 | /* Parameter names. */ | |
1665 | if (macro->fun_like) | |
1666 | { | |
1667 | *buffer++ = '('; | |
1668 | for (i = 0; i < macro->paramc; i++) | |
1669 | { | |
1670 | cpp_hashnode *param = macro->params[i]; | |
1671 | ||
1672 | if (param != pfile->spec_nodes.n__VA_ARGS__) | |
1673 | { | |
a28c5035 NB |
1674 | memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); |
1675 | buffer += NODE_LEN (param); | |
93c80368 NB |
1676 | } |
1677 | ||
1678 | if (i + 1 < macro->paramc) | |
df383483 KH |
1679 | /* Don't emit a space after the comma here; we're trying |
1680 | to emit a Dwarf-friendly definition, and the Dwarf spec | |
1681 | forbids spaces in the argument list. */ | |
64d08263 | 1682 | *buffer++ = ','; |
28e0f040 | 1683 | else if (macro->variadic) |
93c80368 NB |
1684 | *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; |
1685 | } | |
1686 | *buffer++ = ')'; | |
1687 | } | |
1688 | ||
e37b38d7 JB |
1689 | /* The Dwarf spec requires a space after the macro name, even if the |
1690 | definition is the empty string. */ | |
1691 | *buffer++ = ' '; | |
1692 | ||
278c4662 NB |
1693 | if (CPP_OPTION (pfile, traditional)) |
1694 | buffer = _cpp_copy_replacement_text (macro, buffer); | |
1695 | else if (macro->count) | |
93c80368 | 1696 | /* Expansion tokens. */ |
93c80368 | 1697 | { |
93c80368 NB |
1698 | for (i = 0; i < macro->count; i++) |
1699 | { | |
601328bb | 1700 | cpp_token *token = ¯o->exp.tokens[i]; |
93c80368 NB |
1701 | |
1702 | if (token->flags & PREV_WHITE) | |
1703 | *buffer++ = ' '; | |
1704 | if (token->flags & STRINGIFY_ARG) | |
1705 | *buffer++ = '#'; | |
1706 | ||
1707 | if (token->type == CPP_MACRO_ARG) | |
1708 | { | |
a28c5035 NB |
1709 | len = NODE_LEN (macro->params[token->val.arg_no - 1]); |
1710 | memcpy (buffer, | |
1711 | NODE_NAME (macro->params[token->val.arg_no - 1]), len); | |
93c80368 NB |
1712 | buffer += len; |
1713 | } | |
1714 | else | |
1715 | buffer = cpp_spell_token (pfile, token, buffer); | |
1716 | ||
1717 | if (token->flags & PASTE_LEFT) | |
1718 | { | |
1719 | *buffer++ = ' '; | |
1720 | *buffer++ = '#'; | |
1721 | *buffer++ = '#'; | |
1722 | /* Next has PREV_WHITE; see _cpp_create_definition. */ | |
1723 | } | |
1724 | } | |
1725 | } | |
1726 | ||
1727 | *buffer = '\0'; | |
1728 | return pfile->macro_buffer; | |
1729 | } |