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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, |
ee380365 | 3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
148e4216 | 4 | 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
711b8824 ZW |
5 | Written by Per Bothner, 1994. |
6 | Based on CCCP program by Paul Rubin, June 1986 | |
7 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify it | |
10 | under the terms of the GNU General Public License as published by the | |
748086b7 | 11 | Free Software Foundation; either version 3, or (at your option) any |
711b8824 ZW |
12 | later version. |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
748086b7 JJ |
20 | along with this program; see the file COPYING3. If not see |
21 | <http://www.gnu.org/licenses/>. | |
711b8824 ZW |
22 | |
23 | In other words, you are welcome to use, share and improve this program. | |
24 | You are forbidden to forbid anyone else to use, share and improve | |
25 | what you give them. Help stamp out software-hoarding! */ | |
26 | ||
27 | #include "config.h" | |
28 | #include "system.h" | |
29 | #include "cpplib.h" | |
4f4e53dd | 30 | #include "internal.h" |
711b8824 | 31 | |
93c80368 NB |
32 | typedef struct macro_arg macro_arg; |
33 | struct macro_arg | |
34 | { | |
4ed5bcfb | 35 | const cpp_token **first; /* First token in unexpanded argument. */ |
6d2f8887 | 36 | const cpp_token **expanded; /* Macro-expanded argument. */ |
4ed5bcfb | 37 | const cpp_token *stringified; /* Stringified argument. */ |
93c80368 NB |
38 | unsigned int count; /* # of tokens in argument. */ |
39 | unsigned int expanded_count; /* # of tokens in expanded argument. */ | |
711b8824 ZW |
40 | }; |
41 | ||
93c80368 NB |
42 | /* Macro expansion. */ |
43 | ||
765d600a JJ |
44 | static int enter_macro_context (cpp_reader *, cpp_hashnode *, |
45 | const cpp_token *); | |
6cf87ca4 | 46 | static int builtin_macro (cpp_reader *, cpp_hashnode *); |
6cf87ca4 ZW |
47 | static void push_ptoken_context (cpp_reader *, cpp_hashnode *, _cpp_buff *, |
48 | const cpp_token **, unsigned int); | |
765d600a JJ |
49 | static _cpp_buff *collect_args (cpp_reader *, const cpp_hashnode *, |
50 | _cpp_buff **); | |
6cf87ca4 ZW |
51 | static cpp_context *next_context (cpp_reader *); |
52 | static const cpp_token *padding_token (cpp_reader *, const cpp_token *); | |
53 | static void expand_arg (cpp_reader *, macro_arg *); | |
54 | static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int); | |
55 | static const cpp_token *stringify_arg (cpp_reader *, macro_arg *); | |
56 | static void paste_all_tokens (cpp_reader *, const cpp_token *); | |
57 | static bool paste_tokens (cpp_reader *, const cpp_token **, const cpp_token *); | |
58 | static void replace_args (cpp_reader *, cpp_hashnode *, cpp_macro *, | |
59 | macro_arg *); | |
765d600a JJ |
60 | static _cpp_buff *funlike_invocation_p (cpp_reader *, cpp_hashnode *, |
61 | _cpp_buff **); | |
6cf87ca4 | 62 | static bool create_iso_definition (cpp_reader *, cpp_macro *); |
93c80368 | 63 | |
93c80368 NB |
64 | /* #define directive parsing and handling. */ |
65 | ||
6cf87ca4 ZW |
66 | static cpp_token *alloc_expansion_token (cpp_reader *, cpp_macro *); |
67 | static cpp_token *lex_expansion_token (cpp_reader *, cpp_macro *); | |
68 | static bool warn_of_redefinition (cpp_reader *, const cpp_hashnode *, | |
69 | const cpp_macro *); | |
70 | static bool parse_params (cpp_reader *, cpp_macro *); | |
71 | static void check_trad_stringification (cpp_reader *, const cpp_macro *, | |
72 | const cpp_string *); | |
711b8824 | 73 | |
a69cbaac NB |
74 | /* Emits a warning if NODE is a macro defined in the main file that |
75 | has not been used. */ | |
76 | int | |
6cf87ca4 ZW |
77 | _cpp_warn_if_unused_macro (cpp_reader *pfile, cpp_hashnode *node, |
78 | void *v ATTRIBUTE_UNUSED) | |
a69cbaac NB |
79 | { |
80 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) | |
81 | { | |
82 | cpp_macro *macro = node->value.macro; | |
83 | ||
84 | if (!macro->used | |
50f59cd7 | 85 | && MAIN_FILE_P (linemap_lookup (pfile->line_table, macro->line))) |
0527bc4e | 86 | cpp_error_with_line (pfile, CPP_DL_WARNING, macro->line, 0, |
a69cbaac NB |
87 | "macro \"%s\" is not used", NODE_NAME (node)); |
88 | } | |
89 | ||
90 | return 1; | |
91 | } | |
92 | ||
4ed5bcfb NB |
93 | /* Allocates and returns a CPP_STRING token, containing TEXT of length |
94 | LEN, after null-terminating it. TEXT must be in permanent storage. */ | |
95 | static const cpp_token * | |
6cf87ca4 | 96 | new_string_token (cpp_reader *pfile, unsigned char *text, unsigned int len) |
93c80368 | 97 | { |
4ed5bcfb | 98 | cpp_token *token = _cpp_temp_token (pfile); |
93c80368 | 99 | |
4ed5bcfb | 100 | text[len] = '\0'; |
93c80368 | 101 | token->type = CPP_STRING; |
4ed5bcfb NB |
102 | token->val.str.len = len; |
103 | token->val.str.text = text; | |
93c80368 | 104 | token->flags = 0; |
4ed5bcfb | 105 | return token; |
93c80368 NB |
106 | } |
107 | ||
93c80368 NB |
108 | static const char * const monthnames[] = |
109 | { | |
110 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
111 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | |
112 | }; | |
113 | ||
21b11495 ZW |
114 | /* Helper function for builtin_macro. Returns the text generated by |
115 | a builtin macro. */ | |
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 | 120 | const uchar *result = NULL; |
1bb64668 | 121 | linenum_type 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 | |
be8ac3e2 GZ |
130 | case BT_TIMESTAMP: |
131 | { | |
132 | cpp_buffer *pbuffer = cpp_get_buffer (pfile); | |
133 | if (pbuffer->timestamp == NULL) | |
134 | { | |
135 | /* Initialize timestamp value of the assotiated file. */ | |
136 | struct _cpp_file *file = cpp_get_file (pbuffer); | |
137 | if (file) | |
138 | { | |
139 | /* Generate __TIMESTAMP__ string, that represents | |
140 | the date and time of the last modification | |
141 | of the current source file. The string constant | |
142 | looks like "Sun Sep 16 01:03:52 1973". */ | |
143 | struct tm *tb = NULL; | |
144 | struct stat *st = _cpp_get_file_stat (file); | |
145 | if (st) | |
146 | tb = localtime (&st->st_mtime); | |
147 | if (tb) | |
148 | { | |
149 | char *str = asctime (tb); | |
150 | size_t len = strlen (str); | |
151 | unsigned char *buf = _cpp_unaligned_alloc (pfile, len + 2); | |
152 | buf[0] = '"'; | |
153 | strcpy ((char *) buf + 1, str); | |
154 | buf[len] = '"'; | |
155 | pbuffer->timestamp = buf; | |
156 | } | |
157 | else | |
158 | { | |
159 | cpp_errno (pfile, CPP_DL_WARNING, | |
160 | "could not determine file timestamp"); | |
b6baa67d | 161 | pbuffer->timestamp = UC"\"??? ??? ?? ??:??:?? ????\""; |
be8ac3e2 GZ |
162 | } |
163 | } | |
164 | } | |
165 | result = pbuffer->timestamp; | |
166 | } | |
167 | break; | |
93c80368 NB |
168 | case BT_FILE: |
169 | case BT_BASE_FILE: | |
711b8824 | 170 | { |
4ed5bcfb | 171 | unsigned int len; |
0bda4760 | 172 | const char *name; |
562a5c27 | 173 | uchar *buf; |
500bee0a | 174 | map = linemap_lookup (pfile->line_table, pfile->line_table->highest_line); |
0bda4760 NB |
175 | |
176 | if (node->value.builtin == BT_BASE_FILE) | |
bb74c963 | 177 | while (! MAIN_FILE_P (map)) |
50f59cd7 | 178 | map = INCLUDED_FROM (pfile->line_table, map); |
0bda4760 | 179 | |
bb74c963 | 180 | name = map->to_file; |
4ed5bcfb | 181 | len = strlen (name); |
651ed942 | 182 | buf = _cpp_unaligned_alloc (pfile, len * 2 + 3); |
278c4662 NB |
183 | result = buf; |
184 | *buf = '"'; | |
185 | buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len); | |
186 | *buf++ = '"'; | |
187 | *buf = '\0'; | |
711b8824 | 188 | } |
644eddaa NB |
189 | break; |
190 | ||
93c80368 | 191 | case BT_INCLUDE_LEVEL: |
d8693c6f NB |
192 | /* The line map depth counts the primary source as level 1, but |
193 | historically __INCLUDE_DEPTH__ has called the primary source | |
194 | level 0. */ | |
50f59cd7 | 195 | number = pfile->line_table->depth - 1; |
644eddaa | 196 | break; |
93c80368 NB |
197 | |
198 | case BT_SPECLINE: | |
500bee0a | 199 | map = &pfile->line_table->maps[pfile->line_table->used-1]; |
93c80368 NB |
200 | /* If __LINE__ is embedded in a macro, it must expand to the |
201 | line of the macro's invocation, not its definition. | |
202 | Otherwise things like assert() will not work properly. */ | |
1bb64668 MLI |
203 | number = SOURCE_LINE (map, |
204 | CPP_OPTION (pfile, traditional) | |
205 | ? pfile->line_table->highest_line | |
206 | : pfile->cur_token[-1].src_loc); | |
644eddaa | 207 | break; |
93c80368 | 208 | |
5279d739 ZW |
209 | /* __STDC__ has the value 1 under normal circumstances. |
210 | However, if (a) we are in a system header, (b) the option | |
2a1dc0d8 ZW |
211 | stdc_0_in_system_headers is true (set by target config), and |
212 | (c) we are not in strictly conforming mode, then it has the | |
83900997 | 213 | value 0. (b) and (c) are already checked in cpp_init_builtins. */ |
93c80368 | 214 | case BT_STDC: |
83900997 JJ |
215 | if (cpp_in_system_header (pfile)) |
216 | number = 0; | |
217 | else | |
218 | number = 1; | |
644eddaa | 219 | break; |
711b8824 | 220 | |
93c80368 NB |
221 | case BT_DATE: |
222 | case BT_TIME: | |
278c4662 | 223 | if (pfile->date == NULL) |
93c80368 | 224 | { |
4ed5bcfb NB |
225 | /* Allocate __DATE__ and __TIME__ strings from permanent |
226 | storage. We only do this once, and don't generate them | |
227 | at init time, because time() and localtime() are very | |
228 | slow on some systems. */ | |
56da7207 ZW |
229 | time_t tt; |
230 | struct tm *tb = NULL; | |
231 | ||
232 | /* (time_t) -1 is a legitimate value for "number of seconds | |
233 | since the Epoch", so we have to do a little dance to | |
234 | distinguish that from a genuine error. */ | |
235 | errno = 0; | |
236 | tt = time(NULL); | |
237 | if (tt != (time_t)-1 || errno == 0) | |
238 | tb = localtime (&tt); | |
239 | ||
240 | if (tb) | |
241 | { | |
242 | pfile->date = _cpp_unaligned_alloc (pfile, | |
243 | sizeof ("\"Oct 11 1347\"")); | |
244 | sprintf ((char *) pfile->date, "\"%s %2d %4d\"", | |
6cf87ca4 ZW |
245 | monthnames[tb->tm_mon], tb->tm_mday, |
246 | tb->tm_year + 1900); | |
56da7207 ZW |
247 | |
248 | pfile->time = _cpp_unaligned_alloc (pfile, | |
249 | sizeof ("\"12:34:56\"")); | |
250 | sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", | |
251 | tb->tm_hour, tb->tm_min, tb->tm_sec); | |
252 | } | |
253 | else | |
254 | { | |
0527bc4e | 255 | cpp_errno (pfile, CPP_DL_WARNING, |
56da7207 ZW |
256 | "could not determine date and time"); |
257 | ||
b6baa67d KVH |
258 | pfile->date = UC"\"??? ?? ????\""; |
259 | pfile->time = UC"\"??:??:??\""; | |
56da7207 | 260 | } |
93c80368 | 261 | } |
93c80368 | 262 | |
644eddaa | 263 | if (node->value.builtin == BT_DATE) |
278c4662 | 264 | result = pfile->date; |
644eddaa | 265 | else |
278c4662 | 266 | result = pfile->time; |
644eddaa | 267 | break; |
a702045a OW |
268 | |
269 | case BT_COUNTER: | |
ccfc4c91 OW |
270 | if (CPP_OPTION (pfile, directives_only) && pfile->state.in_directive) |
271 | cpp_error (pfile, CPP_DL_ERROR, | |
272 | "__COUNTER__ expanded inside directive with -fdirectives-only"); | |
a702045a OW |
273 | number = pfile->counter++; |
274 | break; | |
278c4662 NB |
275 | } |
276 | ||
277 | if (result == NULL) | |
278 | { | |
279 | /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ | |
280 | result = _cpp_unaligned_alloc (pfile, 21); | |
281 | sprintf ((char *) result, "%u", number); | |
282 | } | |
283 | ||
284 | return result; | |
285 | } | |
286 | ||
287 | /* Convert builtin macros like __FILE__ to a token and push it on the | |
21b11495 ZW |
288 | context stack. Also handles _Pragma, for which a new token may not |
289 | be created. Returns 1 if it generates a new token context, 0 to | |
278c4662 NB |
290 | return the token to the caller. */ |
291 | static int | |
6cf87ca4 | 292 | builtin_macro (cpp_reader *pfile, cpp_hashnode *node) |
278c4662 NB |
293 | { |
294 | const uchar *buf; | |
26aea073 NB |
295 | size_t len; |
296 | char *nbuf; | |
644eddaa | 297 | |
278c4662 NB |
298 | if (node->value.builtin == BT_PRAGMA) |
299 | { | |
644eddaa NB |
300 | /* Don't interpret _Pragma within directives. The standard is |
301 | not clear on this, but to me this makes most sense. */ | |
302 | if (pfile->state.in_directive) | |
303 | return 0; | |
304 | ||
5b9a40df | 305 | return _cpp_do__Pragma (pfile); |
93c80368 | 306 | } |
644eddaa | 307 | |
278c4662 | 308 | buf = _cpp_builtin_macro_text (pfile, node); |
26aea073 | 309 | len = ustrlen (buf); |
c3f829c1 | 310 | nbuf = (char *) alloca (len + 1); |
26aea073 NB |
311 | memcpy (nbuf, buf, len); |
312 | nbuf[len]='\n'; | |
278c4662 | 313 | |
40de9f76 | 314 | cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true); |
26aea073 | 315 | _cpp_clean_line (pfile); |
278c4662 NB |
316 | |
317 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
318 | pfile->cur_token = _cpp_temp_token (pfile); | |
bc4071dd | 319 | _cpp_push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1); |
278c4662 | 320 | if (pfile->buffer->cur != pfile->buffer->rlimit) |
0527bc4e | 321 | cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", |
278c4662 NB |
322 | NODE_NAME (node)); |
323 | _cpp_pop_buffer (pfile); | |
324 | ||
644eddaa | 325 | return 1; |
711b8824 ZW |
326 | } |
327 | ||
d15a58c0 | 328 | /* Copies SRC, of length LEN, to DEST, adding backslashes before all |
651ed942 AP |
329 | backslashes and double quotes. DEST must be of sufficient size. |
330 | Returns a pointer to the end of the string. */ | |
562a5c27 | 331 | uchar * |
6cf87ca4 | 332 | cpp_quote_string (uchar *dest, const uchar *src, unsigned int len) |
93c80368 NB |
333 | { |
334 | while (len--) | |
335 | { | |
562a5c27 | 336 | uchar c = *src++; |
711b8824 | 337 | |
93c80368 NB |
338 | if (c == '\\' || c == '"') |
339 | { | |
340 | *dest++ = '\\'; | |
341 | *dest++ = c; | |
342 | } | |
343 | else | |
651ed942 | 344 | *dest++ = c; |
93c80368 | 345 | } |
711b8824 | 346 | |
93c80368 NB |
347 | return dest; |
348 | } | |
711b8824 | 349 | |
d15a58c0 NB |
350 | /* Convert a token sequence ARG to a single string token according to |
351 | the rules of the ISO C #-operator. */ | |
4ed5bcfb | 352 | static const cpp_token * |
6cf87ca4 | 353 | stringify_arg (cpp_reader *pfile, macro_arg *arg) |
93c80368 | 354 | { |
6338b358 | 355 | unsigned char *dest; |
ece54d54 | 356 | unsigned int i, escape_it, backslash_count = 0; |
4ed5bcfb | 357 | const cpp_token *source = NULL; |
ece54d54 | 358 | size_t len; |
711b8824 | 359 | |
6338b358 NB |
360 | if (BUFF_ROOM (pfile->u_buff) < 3) |
361 | _cpp_extend_buff (pfile, &pfile->u_buff, 3); | |
362 | dest = BUFF_FRONT (pfile->u_buff); | |
363 | *dest++ = '"'; | |
364 | ||
93c80368 NB |
365 | /* Loop, reading in the argument's tokens. */ |
366 | for (i = 0; i < arg->count; i++) | |
367 | { | |
4ed5bcfb | 368 | const cpp_token *token = arg->first[i]; |
4ed5bcfb NB |
369 | |
370 | if (token->type == CPP_PADDING) | |
371 | { | |
18f41a1b JM |
372 | if (source == NULL |
373 | || (!(source->flags & PREV_WHITE) | |
374 | && token->val.source == NULL)) | |
4ed5bcfb NB |
375 | source = token->val.source; |
376 | continue; | |
377 | } | |
711b8824 | 378 | |
b6baa67d | 379 | escape_it = (token->type == CPP_STRING || token->type == CPP_CHAR |
fd2ab214 | 380 | || token->type == CPP_WSTRING || token->type == CPP_WCHAR |
b6baa67d | 381 | || token->type == CPP_STRING32 || token->type == CPP_CHAR32 |
2c6e3f55 JJ |
382 | || token->type == CPP_STRING16 || token->type == CPP_CHAR16 |
383 | || token->type == CPP_UTF8STRING); | |
711b8824 | 384 | |
ece54d54 | 385 | /* Room for each char being written in octal, initial space and |
6338b358 | 386 | final quote and NUL. */ |
4ed5bcfb | 387 | len = cpp_token_len (token); |
93c80368 | 388 | if (escape_it) |
93c80368 | 389 | len *= 4; |
6338b358 | 390 | len += 3; |
711b8824 | 391 | |
ece54d54 | 392 | if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) |
93c80368 | 393 | { |
ece54d54 | 394 | size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); |
8c3b2693 | 395 | _cpp_extend_buff (pfile, &pfile->u_buff, len); |
ece54d54 | 396 | dest = BUFF_FRONT (pfile->u_buff) + len_so_far; |
93c80368 | 397 | } |
711b8824 | 398 | |
4ed5bcfb | 399 | /* Leading white space? */ |
6338b358 | 400 | if (dest - 1 != BUFF_FRONT (pfile->u_buff)) |
4ed5bcfb NB |
401 | { |
402 | if (source == NULL) | |
403 | source = token; | |
404 | if (source->flags & PREV_WHITE) | |
405 | *dest++ = ' '; | |
406 | } | |
407 | source = NULL; | |
711b8824 | 408 | |
93c80368 NB |
409 | if (escape_it) |
410 | { | |
ece54d54 NB |
411 | _cpp_buff *buff = _cpp_get_buff (pfile, len); |
412 | unsigned char *buf = BUFF_FRONT (buff); | |
47e20491 | 413 | len = cpp_spell_token (pfile, token, buf, true) - buf; |
dcc229e5 | 414 | dest = cpp_quote_string (dest, buf, len); |
ece54d54 | 415 | _cpp_release_buff (pfile, buff); |
93c80368 NB |
416 | } |
417 | else | |
47e20491 | 418 | dest = cpp_spell_token (pfile, token, dest, true); |
93c80368 | 419 | |
1067694a | 420 | if (token->type == CPP_OTHER && token->val.str.text[0] == '\\') |
93c80368 NB |
421 | backslash_count++; |
422 | else | |
423 | backslash_count = 0; | |
424 | } | |
425 | ||
426 | /* Ignore the final \ of invalid string literals. */ | |
427 | if (backslash_count & 1) | |
428 | { | |
0527bc4e | 429 | cpp_error (pfile, CPP_DL_WARNING, |
ebef4e8c | 430 | "invalid string literal, ignoring final '\\'"); |
ece54d54 | 431 | dest--; |
93c80368 NB |
432 | } |
433 | ||
4ed5bcfb | 434 | /* Commit the memory, including NUL, and return the token. */ |
6338b358 | 435 | *dest++ = '"'; |
ece54d54 NB |
436 | len = dest - BUFF_FRONT (pfile->u_buff); |
437 | BUFF_FRONT (pfile->u_buff) = dest + 1; | |
438 | return new_string_token (pfile, dest - len, len); | |
93c80368 NB |
439 | } |
440 | ||
da7d8304 | 441 | /* Try to paste two tokens. On success, return nonzero. In any |
c9e7a609 NB |
442 | case, PLHS is updated to point to the pasted token, which is |
443 | guaranteed to not have the PASTE_LEFT flag set. */ | |
444 | static bool | |
6cf87ca4 | 445 | paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs) |
d63eefbf | 446 | { |
de000d22 | 447 | unsigned char *buf, *end, *lhsend; |
fca35e1b | 448 | cpp_token *lhs; |
c9e7a609 | 449 | unsigned int len; |
c9e7a609 | 450 | |
fca35e1b | 451 | len = cpp_token_len (*plhs) + cpp_token_len (rhs) + 1; |
c3f829c1 | 452 | buf = (unsigned char *) alloca (len); |
fca35e1b | 453 | end = lhsend = cpp_spell_token (pfile, *plhs, buf, false); |
c9e7a609 NB |
454 | |
455 | /* Avoid comment headers, since they are still processed in stage 3. | |
456 | It is simpler to insert a space here, rather than modifying the | |
457 | lexer to ignore comments in some circumstances. Simply returning | |
458 | false doesn't work, since we want to clear the PASTE_LEFT flag. */ | |
fca35e1b | 459 | if ((*plhs)->type == CPP_DIV && rhs->type != CPP_EQ) |
c9e7a609 | 460 | *end++ = ' '; |
f373b44d TT |
461 | /* In one obscure case we might see padding here. */ |
462 | if (rhs->type != CPP_PADDING) | |
463 | end = cpp_spell_token (pfile, rhs, end, false); | |
26aea073 | 464 | *end = '\n'; |
c9e7a609 | 465 | |
40de9f76 | 466 | cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true); |
26aea073 | 467 | _cpp_clean_line (pfile); |
c9e7a609 NB |
468 | |
469 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
470 | pfile->cur_token = _cpp_temp_token (pfile); | |
fca35e1b | 471 | lhs = _cpp_lex_direct (pfile); |
de000d22 JJ |
472 | if (pfile->buffer->cur != pfile->buffer->rlimit) |
473 | { | |
fca35e1b TT |
474 | source_location saved_loc = lhs->src_loc; |
475 | ||
de000d22 JJ |
476 | _cpp_pop_buffer (pfile); |
477 | _cpp_backup_tokens (pfile, 1); | |
478 | *lhsend = '\0'; | |
479 | ||
fca35e1b TT |
480 | /* We have to remove the PASTE_LEFT flag from the old lhs, but |
481 | we want to keep the new location. */ | |
482 | *lhs = **plhs; | |
483 | *plhs = lhs; | |
484 | lhs->src_loc = saved_loc; | |
485 | lhs->flags &= ~PASTE_LEFT; | |
486 | ||
de000d22 JJ |
487 | /* Mandatory error for all apart from assembler. */ |
488 | if (CPP_OPTION (pfile, lang) != CLK_ASM) | |
489 | cpp_error (pfile, CPP_DL_ERROR, | |
490 | "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", | |
491 | buf, cpp_token_as_text (pfile, rhs)); | |
492 | return false; | |
493 | } | |
c9e7a609 | 494 | |
fca35e1b | 495 | *plhs = lhs; |
de000d22 JJ |
496 | _cpp_pop_buffer (pfile); |
497 | return true; | |
d63eefbf NB |
498 | } |
499 | ||
d15a58c0 NB |
500 | /* Handles an arbitrarily long sequence of ## operators, with initial |
501 | operand LHS. This implementation is left-associative, | |
502 | non-recursive, and finishes a paste before handling succeeding | |
503 | ones. If a paste fails, we back up to the RHS of the failing ## | |
504 | operator before pushing the context containing the result of prior | |
505 | successful pastes, with the effect that the RHS appears in the | |
506 | output stream after the pasted LHS normally. */ | |
93c80368 | 507 | static void |
6cf87ca4 | 508 | paste_all_tokens (cpp_reader *pfile, const cpp_token *lhs) |
93c80368 | 509 | { |
4ed5bcfb NB |
510 | const cpp_token *rhs; |
511 | cpp_context *context = pfile->context; | |
512 | ||
93c80368 NB |
513 | do |
514 | { | |
515 | /* Take the token directly from the current context. We can do | |
516 | this, because we are in the replacement list of either an | |
517 | object-like macro, or a function-like macro with arguments | |
518 | inserted. In either case, the constraints to #define | |
d63eefbf | 519 | guarantee we have at least one more token. */ |
4ed5bcfb | 520 | if (context->direct_p) |
82eda77e | 521 | rhs = FIRST (context).token++; |
4ed5bcfb | 522 | else |
82eda77e | 523 | rhs = *FIRST (context).ptoken++; |
4ed5bcfb NB |
524 | |
525 | if (rhs->type == CPP_PADDING) | |
f373b44d TT |
526 | { |
527 | if (rhs->flags & PASTE_LEFT) | |
528 | abort (); | |
529 | } | |
c9e7a609 | 530 | if (!paste_tokens (pfile, &lhs, rhs)) |
de000d22 | 531 | break; |
93c80368 NB |
532 | } |
533 | while (rhs->flags & PASTE_LEFT); | |
534 | ||
c9e7a609 | 535 | /* Put the resulting token in its own context. */ |
bc4071dd | 536 | _cpp_push_token_context (pfile, NULL, lhs, 1); |
93c80368 NB |
537 | } |
538 | ||
1ce676a0 NB |
539 | /* Returns TRUE if the number of arguments ARGC supplied in an |
540 | invocation of the MACRO referenced by NODE is valid. An empty | |
541 | invocation to a macro with no parameters should pass ARGC as zero. | |
542 | ||
543 | Note that MACRO cannot necessarily be deduced from NODE, in case | |
544 | NODE was redefined whilst collecting arguments. */ | |
545 | bool | |
6cf87ca4 | 546 | _cpp_arguments_ok (cpp_reader *pfile, cpp_macro *macro, const cpp_hashnode *node, unsigned int argc) |
1ce676a0 NB |
547 | { |
548 | if (argc == macro->paramc) | |
549 | return true; | |
550 | ||
551 | if (argc < macro->paramc) | |
552 | { | |
553 | /* As an extension, a rest argument is allowed to not appear in | |
554 | the invocation at all. | |
555 | e.g. #define debug(format, args...) something | |
556 | debug("string"); | |
557 | ||
558 | This is exactly the same as if there had been an empty rest | |
559 | argument - debug("string", ). */ | |
560 | ||
561 | if (argc + 1 == macro->paramc && macro->variadic) | |
562 | { | |
563 | if (CPP_PEDANTIC (pfile) && ! macro->syshdr) | |
0527bc4e | 564 | cpp_error (pfile, CPP_DL_PEDWARN, |
1ce676a0 NB |
565 | "ISO C99 requires rest arguments to be used"); |
566 | return true; | |
567 | } | |
568 | ||
0527bc4e | 569 | cpp_error (pfile, CPP_DL_ERROR, |
1ce676a0 NB |
570 | "macro \"%s\" requires %u arguments, but only %u given", |
571 | NODE_NAME (node), macro->paramc, argc); | |
572 | } | |
573 | else | |
0527bc4e | 574 | cpp_error (pfile, CPP_DL_ERROR, |
1ce676a0 NB |
575 | "macro \"%s\" passed %u arguments, but takes just %u", |
576 | NODE_NAME (node), argc, macro->paramc); | |
577 | ||
578 | return false; | |
579 | } | |
580 | ||
d15a58c0 NB |
581 | /* Reads and returns the arguments to a function-like macro |
582 | invocation. Assumes the opening parenthesis has been processed. | |
583 | If there is an error, emits an appropriate diagnostic and returns | |
584 | NULL. Each argument is terminated by a CPP_EOF token, for the | |
765d600a JJ |
585 | future benefit of expand_arg(). If there are any deferred |
586 | #pragma directives among macro arguments, store pointers to the | |
587 | CPP_PRAGMA ... CPP_PRAGMA_EOL tokens into *PRAGMA_BUFF buffer. */ | |
b8af0ca5 | 588 | static _cpp_buff * |
765d600a JJ |
589 | collect_args (cpp_reader *pfile, const cpp_hashnode *node, |
590 | _cpp_buff **pragma_buff) | |
93c80368 | 591 | { |
b8af0ca5 NB |
592 | _cpp_buff *buff, *base_buff; |
593 | cpp_macro *macro; | |
594 | macro_arg *args, *arg; | |
595 | const cpp_token *token; | |
596 | unsigned int argc; | |
b8af0ca5 NB |
597 | |
598 | macro = node->value.macro; | |
599 | if (macro->paramc) | |
600 | argc = macro->paramc; | |
601 | else | |
602 | argc = 1; | |
603 | buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) | |
604 | + sizeof (macro_arg))); | |
605 | base_buff = buff; | |
606 | args = (macro_arg *) buff->base; | |
607 | memset (args, 0, argc * sizeof (macro_arg)); | |
ece54d54 | 608 | buff->cur = (unsigned char *) &args[argc]; |
b8af0ca5 NB |
609 | arg = args, argc = 0; |
610 | ||
611 | /* Collect the tokens making up each argument. We don't yet know | |
612 | how many arguments have been supplied, whether too many or too | |
613 | few. Hence the slightly bizarre usage of "argc" and "arg". */ | |
614 | do | |
93c80368 | 615 | { |
b8af0ca5 NB |
616 | unsigned int paren_depth = 0; |
617 | unsigned int ntokens = 0; | |
93c80368 | 618 | |
b8af0ca5 NB |
619 | argc++; |
620 | arg->first = (const cpp_token **) buff->cur; | |
711b8824 | 621 | |
b8af0ca5 NB |
622 | for (;;) |
623 | { | |
624 | /* Require space for 2 new tokens (including a CPP_EOF). */ | |
ece54d54 | 625 | if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) |
b8af0ca5 | 626 | { |
8c3b2693 NB |
627 | buff = _cpp_append_extend_buff (pfile, buff, |
628 | 1000 * sizeof (cpp_token *)); | |
b8af0ca5 NB |
629 | arg->first = (const cpp_token **) buff->cur; |
630 | } | |
4ed5bcfb | 631 | |
b8af0ca5 | 632 | token = cpp_get_token (pfile); |
711b8824 | 633 | |
b8af0ca5 NB |
634 | if (token->type == CPP_PADDING) |
635 | { | |
636 | /* Drop leading padding. */ | |
637 | if (ntokens == 0) | |
638 | continue; | |
639 | } | |
640 | else if (token->type == CPP_OPEN_PAREN) | |
641 | paren_depth++; | |
642 | else if (token->type == CPP_CLOSE_PAREN) | |
643 | { | |
644 | if (paren_depth-- == 0) | |
645 | break; | |
646 | } | |
647 | else if (token->type == CPP_COMMA) | |
648 | { | |
649 | /* A comma does not terminate an argument within | |
650 | parentheses or as part of a variable argument. */ | |
651 | if (paren_depth == 0 | |
652 | && ! (macro->variadic && argc == macro->paramc)) | |
653 | break; | |
654 | } | |
655 | else if (token->type == CPP_EOF | |
656 | || (token->type == CPP_HASH && token->flags & BOL)) | |
657 | break; | |
765d600a JJ |
658 | else if (token->type == CPP_PRAGMA) |
659 | { | |
660 | cpp_token *newtok = _cpp_temp_token (pfile); | |
661 | ||
662 | /* CPP_PRAGMA token lives in directive_result, which will | |
663 | be overwritten on the next directive. */ | |
664 | *newtok = *token; | |
665 | token = newtok; | |
666 | do | |
667 | { | |
668 | if (*pragma_buff == NULL | |
669 | || BUFF_ROOM (*pragma_buff) < sizeof (cpp_token *)) | |
670 | { | |
671 | _cpp_buff *next; | |
672 | if (*pragma_buff == NULL) | |
673 | *pragma_buff | |
674 | = _cpp_get_buff (pfile, 32 * sizeof (cpp_token *)); | |
675 | else | |
676 | { | |
677 | next = *pragma_buff; | |
678 | *pragma_buff | |
679 | = _cpp_get_buff (pfile, | |
680 | (BUFF_FRONT (*pragma_buff) | |
681 | - (*pragma_buff)->base) * 2); | |
682 | (*pragma_buff)->next = next; | |
683 | } | |
684 | } | |
685 | *(const cpp_token **) BUFF_FRONT (*pragma_buff) = token; | |
686 | BUFF_FRONT (*pragma_buff) += sizeof (cpp_token *); | |
687 | if (token->type == CPP_PRAGMA_EOL) | |
688 | break; | |
689 | token = cpp_get_token (pfile); | |
690 | } | |
691 | while (token->type != CPP_EOF); | |
692 | ||
693 | /* In deferred pragmas parsing_args and prevent_expansion | |
694 | had been changed, reset it. */ | |
695 | pfile->state.parsing_args = 2; | |
696 | pfile->state.prevent_expansion = 1; | |
697 | ||
698 | if (token->type == CPP_EOF) | |
699 | break; | |
700 | else | |
701 | continue; | |
702 | } | |
93c80368 | 703 | |
b8af0ca5 NB |
704 | arg->first[ntokens++] = token; |
705 | } | |
93c80368 | 706 | |
b8af0ca5 NB |
707 | /* Drop trailing padding. */ |
708 | while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) | |
709 | ntokens--; | |
93c80368 | 710 | |
b8af0ca5 NB |
711 | arg->count = ntokens; |
712 | arg->first[ntokens] = &pfile->eof; | |
93c80368 | 713 | |
b8af0ca5 NB |
714 | /* Terminate the argument. Excess arguments loop back and |
715 | overwrite the final legitimate argument, before failing. */ | |
716 | if (argc <= macro->paramc) | |
717 | { | |
ece54d54 | 718 | buff->cur = (unsigned char *) &arg->first[ntokens + 1]; |
b8af0ca5 NB |
719 | if (argc != macro->paramc) |
720 | arg++; | |
721 | } | |
93c80368 | 722 | } |
e808ec9c | 723 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
93c80368 | 724 | |
e808ec9c | 725 | if (token->type == CPP_EOF) |
93c80368 | 726 | { |
ece54d54 NB |
727 | /* We still need the CPP_EOF to end directives, and to end |
728 | pre-expansion of a macro argument. Step back is not | |
729 | unconditional, since we don't want to return a CPP_EOF to our | |
730 | callers at the end of an -include-d file. */ | |
e808ec9c | 731 | if (pfile->context->prev || pfile->state.in_directive) |
b8af0ca5 | 732 | _cpp_backup_tokens (pfile, 1); |
0527bc4e | 733 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 734 | "unterminated argument list invoking macro \"%s\"", |
a28c5035 | 735 | NODE_NAME (node)); |
93c80368 | 736 | } |
1ce676a0 | 737 | else |
93c80368 | 738 | { |
1ce676a0 NB |
739 | /* A single empty argument is counted as no argument. */ |
740 | if (argc == 1 && macro->paramc == 0 && args[0].count == 0) | |
741 | argc = 0; | |
742 | if (_cpp_arguments_ok (pfile, macro, node, argc)) | |
58551c23 NB |
743 | { |
744 | /* GCC has special semantics for , ## b where b is a varargs | |
745 | parameter: we remove the comma if b was omitted entirely. | |
746 | If b was merely an empty argument, the comma is retained. | |
747 | If the macro takes just one (varargs) parameter, then we | |
748 | retain the comma only if we are standards conforming. | |
749 | ||
750 | If FIRST is NULL replace_args () swallows the comma. */ | |
751 | if (macro->variadic && (argc < macro->paramc | |
752 | || (argc == 1 && args[0].count == 0 | |
753 | && !CPP_OPTION (pfile, std)))) | |
754 | args[macro->paramc - 1].first = NULL; | |
755 | return base_buff; | |
756 | } | |
93c80368 NB |
757 | } |
758 | ||
1ce676a0 | 759 | /* An error occurred. */ |
b8af0ca5 NB |
760 | _cpp_release_buff (pfile, base_buff); |
761 | return NULL; | |
93c80368 NB |
762 | } |
763 | ||
d6da836d NB |
764 | /* Search for an opening parenthesis to the macro of NODE, in such a |
765 | way that, if none is found, we don't lose the information in any | |
766 | intervening padding tokens. If we find the parenthesis, collect | |
765d600a JJ |
767 | the arguments and return the buffer containing them. PRAGMA_BUFF |
768 | argument is the same as in collect_args. */ | |
d6da836d | 769 | static _cpp_buff * |
765d600a JJ |
770 | funlike_invocation_p (cpp_reader *pfile, cpp_hashnode *node, |
771 | _cpp_buff **pragma_buff) | |
93c80368 | 772 | { |
d6da836d | 773 | const cpp_token *token, *padding = NULL; |
4ed5bcfb | 774 | |
d6da836d | 775 | for (;;) |
bdcbe496 | 776 | { |
d6da836d NB |
777 | token = cpp_get_token (pfile); |
778 | if (token->type != CPP_PADDING) | |
779 | break; | |
780 | if (padding == NULL | |
781 | || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) | |
782 | padding = token; | |
bdcbe496 | 783 | } |
93c80368 | 784 | |
d6da836d | 785 | if (token->type == CPP_OPEN_PAREN) |
93c80368 | 786 | { |
d6da836d | 787 | pfile->state.parsing_args = 2; |
765d600a | 788 | return collect_args (pfile, node, pragma_buff); |
93c80368 NB |
789 | } |
790 | ||
9ac3b1be NB |
791 | /* CPP_EOF can be the end of macro arguments, or the end of the |
792 | file. We mustn't back up over the latter. Ugh. */ | |
793 | if (token->type != CPP_EOF || token == &pfile->eof) | |
794 | { | |
795 | /* Back up. We may have skipped padding, in which case backing | |
796 | up more than one token when expanding macros is in general | |
797 | too difficult. We re-insert it in its own context. */ | |
798 | _cpp_backup_tokens (pfile, 1); | |
799 | if (padding) | |
bc4071dd | 800 | _cpp_push_token_context (pfile, NULL, padding, 1); |
9ac3b1be | 801 | } |
d6da836d NB |
802 | |
803 | return NULL; | |
93c80368 NB |
804 | } |
805 | ||
aa508502 JM |
806 | /* Return the real number of tokens in the expansion of MACRO. */ |
807 | static inline unsigned int | |
808 | macro_real_token_count (const cpp_macro *macro) | |
809 | { | |
810 | unsigned int i; | |
811 | if (__builtin_expect (!macro->extra_tokens, true)) | |
812 | return macro->count; | |
813 | for (i = 0; i < macro->count; i++) | |
814 | if (macro->exp.tokens[i].type == CPP_PASTE) | |
815 | return i; | |
816 | abort (); | |
817 | } | |
818 | ||
d15a58c0 NB |
819 | /* Push the context of a macro with hash entry NODE onto the context |
820 | stack. If we can successfully expand the macro, we push a context | |
821 | containing its yet-to-be-rescanned replacement list and return one. | |
765d600a JJ |
822 | If there were additionally any unexpanded deferred #pragma directives |
823 | among macro arguments, push another context containing the | |
824 | pragma tokens before the yet-to-be-rescanned replacement list | |
825 | and return two. Otherwise, we don't push a context and return zero. */ | |
711b8824 | 826 | static int |
765d600a JJ |
827 | enter_macro_context (cpp_reader *pfile, cpp_hashnode *node, |
828 | const cpp_token *result) | |
711b8824 | 829 | { |
d15a58c0 | 830 | /* The presence of a macro invalidates a file's controlling macro. */ |
644eddaa NB |
831 | pfile->mi_valid = false; |
832 | ||
3620711b NB |
833 | pfile->state.angled_headers = false; |
834 | ||
93d45d9e JM |
835 | if ((node->flags & NODE_BUILTIN) && !(node->flags & NODE_USED)) |
836 | { | |
837 | node->flags |= NODE_USED; | |
838 | if (pfile->cb.used_define) | |
839 | pfile->cb.used_define (pfile, pfile->directive_line, node); | |
840 | } | |
841 | ||
d15a58c0 | 842 | /* Handle standard macros. */ |
644eddaa | 843 | if (! (node->flags & NODE_BUILTIN)) |
711b8824 | 844 | { |
4ed5bcfb | 845 | cpp_macro *macro = node->value.macro; |
765d600a | 846 | _cpp_buff *pragma_buff = NULL; |
4c2b647d | 847 | |
d6da836d NB |
848 | if (macro->fun_like) |
849 | { | |
850 | _cpp_buff *buff; | |
851 | ||
852 | pfile->state.prevent_expansion++; | |
853 | pfile->keep_tokens++; | |
854 | pfile->state.parsing_args = 1; | |
765d600a | 855 | buff = funlike_invocation_p (pfile, node, &pragma_buff); |
d6da836d NB |
856 | pfile->state.parsing_args = 0; |
857 | pfile->keep_tokens--; | |
858 | pfile->state.prevent_expansion--; | |
859 | ||
860 | if (buff == NULL) | |
861 | { | |
862 | if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr) | |
0527bc4e | 863 | cpp_error (pfile, CPP_DL_WARNING, |
d6da836d | 864 | "function-like macro \"%s\" must be used with arguments in traditional C", |
ebef4e8c | 865 | NODE_NAME (node)); |
d6da836d | 866 | |
765d600a JJ |
867 | if (pragma_buff) |
868 | _cpp_release_buff (pfile, pragma_buff); | |
869 | ||
d6da836d NB |
870 | return 0; |
871 | } | |
872 | ||
e808ec9c NB |
873 | if (macro->paramc > 0) |
874 | replace_args (pfile, node, macro, (macro_arg *) buff->base); | |
d6da836d NB |
875 | _cpp_release_buff (pfile, buff); |
876 | } | |
93c80368 | 877 | |
4ed5bcfb | 878 | /* Disable the macro within its expansion. */ |
644eddaa | 879 | node->flags |= NODE_DISABLED; |
93c80368 | 880 | |
93d45d9e JM |
881 | if (!(node->flags & NODE_USED)) |
882 | { | |
883 | node->flags |= NODE_USED; | |
884 | if (pfile->cb.used_define) | |
885 | pfile->cb.used_define (pfile, pfile->directive_line, node); | |
886 | } | |
887 | ||
3de8a540 AC |
888 | if (pfile->cb.used) |
889 | pfile->cb.used (pfile, result->src_loc, node); | |
890 | ||
a69cbaac NB |
891 | macro->used = 1; |
892 | ||
4ed5bcfb | 893 | if (macro->paramc == 0) |
aa508502 JM |
894 | _cpp_push_token_context (pfile, node, macro->exp.tokens, |
895 | macro_real_token_count (macro)); | |
644eddaa | 896 | |
765d600a JJ |
897 | if (pragma_buff) |
898 | { | |
899 | if (!pfile->state.in_directive) | |
900 | _cpp_push_token_context (pfile, NULL, | |
901 | padding_token (pfile, result), 1); | |
902 | do | |
903 | { | |
904 | _cpp_buff *tail = pragma_buff->next; | |
905 | pragma_buff->next = NULL; | |
906 | push_ptoken_context (pfile, NULL, pragma_buff, | |
907 | (const cpp_token **) pragma_buff->base, | |
908 | ((const cpp_token **) BUFF_FRONT (pragma_buff) | |
909 | - (const cpp_token **) pragma_buff->base)); | |
910 | pragma_buff = tail; | |
911 | } | |
912 | while (pragma_buff != NULL); | |
913 | return 2; | |
914 | } | |
915 | ||
644eddaa | 916 | return 1; |
711b8824 | 917 | } |
644eddaa | 918 | |
d15a58c0 | 919 | /* Handle built-in macros and the _Pragma operator. */ |
644eddaa | 920 | return builtin_macro (pfile, node); |
93c80368 NB |
921 | } |
922 | ||
d15a58c0 NB |
923 | /* Replace the parameters in a function-like macro of NODE with the |
924 | actual ARGS, and place the result in a newly pushed token context. | |
925 | Expand each argument before replacing, unless it is operated upon | |
926 | by the # or ## operators. */ | |
93c80368 | 927 | static void |
6cf87ca4 | 928 | replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro, macro_arg *args) |
93c80368 NB |
929 | { |
930 | unsigned int i, total; | |
931 | const cpp_token *src, *limit; | |
4ed5bcfb | 932 | const cpp_token **dest, **first; |
93c80368 | 933 | macro_arg *arg; |
1e013d2e | 934 | _cpp_buff *buff; |
aa508502 | 935 | unsigned int count; |
93c80368 | 936 | |
93c80368 | 937 | /* First, fully macro-expand arguments, calculating the number of |
1e013d2e NB |
938 | tokens in the final expansion as we go. The ordering of the if |
939 | statements below is subtle; we must handle stringification before | |
940 | pasting. */ | |
aa508502 JM |
941 | count = macro_real_token_count (macro); |
942 | total = count; | |
943 | limit = macro->exp.tokens + count; | |
4ed5bcfb | 944 | |
601328bb | 945 | for (src = macro->exp.tokens; src < limit; src++) |
93c80368 NB |
946 | if (src->type == CPP_MACRO_ARG) |
947 | { | |
4ed5bcfb NB |
948 | /* Leading and trailing padding tokens. */ |
949 | total += 2; | |
950 | ||
93c80368 NB |
951 | /* We have an argument. If it is not being stringified or |
952 | pasted it is macro-replaced before insertion. */ | |
9a0c6187 | 953 | arg = &args[src->val.macro_arg.arg_no - 1]; |
4c2b647d | 954 | |
93c80368 NB |
955 | if (src->flags & STRINGIFY_ARG) |
956 | { | |
957 | if (!arg->stringified) | |
4ed5bcfb | 958 | arg->stringified = stringify_arg (pfile, arg); |
93c80368 NB |
959 | } |
960 | else if ((src->flags & PASTE_LEFT) | |
601328bb | 961 | || (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT))) |
93c80368 NB |
962 | total += arg->count - 1; |
963 | else | |
964 | { | |
965 | if (!arg->expanded) | |
4ed5bcfb | 966 | expand_arg (pfile, arg); |
93c80368 NB |
967 | total += arg->expanded_count - 1; |
968 | } | |
969 | } | |
970 | ||
4ed5bcfb NB |
971 | /* Now allocate space for the expansion, copy the tokens and replace |
972 | the arguments. */ | |
1e013d2e NB |
973 | buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); |
974 | first = (const cpp_token **) buff->base; | |
4ed5bcfb | 975 | dest = first; |
93c80368 | 976 | |
601328bb | 977 | for (src = macro->exp.tokens; src < limit; src++) |
4ed5bcfb NB |
978 | { |
979 | unsigned int count; | |
980 | const cpp_token **from, **paste_flag; | |
93c80368 | 981 | |
4ed5bcfb NB |
982 | if (src->type != CPP_MACRO_ARG) |
983 | { | |
984 | *dest++ = src; | |
985 | continue; | |
986 | } | |
93c80368 | 987 | |
4ed5bcfb | 988 | paste_flag = 0; |
9a0c6187 | 989 | arg = &args[src->val.macro_arg.arg_no - 1]; |
4ed5bcfb NB |
990 | if (src->flags & STRINGIFY_ARG) |
991 | count = 1, from = &arg->stringified; | |
992 | else if (src->flags & PASTE_LEFT) | |
993 | count = arg->count, from = arg->first; | |
601328bb | 994 | else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)) |
4ed5bcfb NB |
995 | { |
996 | count = arg->count, from = arg->first; | |
997 | if (dest != first) | |
998 | { | |
4ed5bcfb NB |
999 | if (dest[-1]->type == CPP_COMMA |
1000 | && macro->variadic | |
9a0c6187 | 1001 | && src->val.macro_arg.arg_no == macro->paramc) |
4ed5bcfb | 1002 | { |
58551c23 NB |
1003 | /* Swallow a pasted comma if from == NULL, otherwise |
1004 | drop the paste flag. */ | |
1005 | if (from == NULL) | |
4ed5bcfb NB |
1006 | dest--; |
1007 | else | |
1008 | paste_flag = dest - 1; | |
1009 | } | |
1010 | /* Remove the paste flag if the RHS is a placemarker. */ | |
1011 | else if (count == 0) | |
1012 | paste_flag = dest - 1; | |
1013 | } | |
1014 | } | |
1015 | else | |
1016 | count = arg->expanded_count, from = arg->expanded; | |
4c2b647d | 1017 | |
4ed5bcfb | 1018 | /* Padding on the left of an argument (unless RHS of ##). */ |
a8d0ddaf | 1019 | if ((!pfile->state.in_directive || pfile->state.directive_wants_padding) |
601328bb | 1020 | && src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT)) |
4ed5bcfb | 1021 | *dest++ = padding_token (pfile, src); |
93c80368 | 1022 | |
4ed5bcfb NB |
1023 | if (count) |
1024 | { | |
1025 | memcpy (dest, from, count * sizeof (cpp_token *)); | |
1026 | dest += count; | |
93c80368 | 1027 | |
4ed5bcfb NB |
1028 | /* With a non-empty argument on the LHS of ##, the last |
1029 | token should be flagged PASTE_LEFT. */ | |
1030 | if (src->flags & PASTE_LEFT) | |
1031 | paste_flag = dest - 1; | |
1032 | } | |
e85edc9e AH |
1033 | else if (CPP_PEDANTIC (pfile) && ! macro->syshdr |
1034 | && ! CPP_OPTION (pfile, c99) | |
1035 | && ! cpp_in_system_header (pfile)) | |
1036 | { | |
1037 | cpp_error (pfile, CPP_DL_PEDWARN, | |
1038 | "invoking macro %s argument %d: " | |
1039 | "empty macro arguments are undefined" | |
1040 | " in ISO C90 and ISO C++98", | |
1041 | NODE_NAME (node), | |
9a0c6187 | 1042 | src->val.macro_arg.arg_no); |
e85edc9e | 1043 | } |
26ec42ee | 1044 | |
4ed5bcfb NB |
1045 | /* Avoid paste on RHS (even case count == 0). */ |
1046 | if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) | |
1047 | *dest++ = &pfile->avoid_paste; | |
93c80368 | 1048 | |
4ed5bcfb NB |
1049 | /* Add a new paste flag, or remove an unwanted one. */ |
1050 | if (paste_flag) | |
1051 | { | |
1052 | cpp_token *token = _cpp_temp_token (pfile); | |
1053 | token->type = (*paste_flag)->type; | |
73096711 | 1054 | token->val = (*paste_flag)->val; |
4ed5bcfb NB |
1055 | if (src->flags & PASTE_LEFT) |
1056 | token->flags = (*paste_flag)->flags | PASTE_LEFT; | |
1057 | else | |
1058 | token->flags = (*paste_flag)->flags & ~PASTE_LEFT; | |
1059 | *paste_flag = token; | |
1060 | } | |
1061 | } | |
4c2b647d | 1062 | |
93c80368 NB |
1063 | /* Free the expanded arguments. */ |
1064 | for (i = 0; i < macro->paramc; i++) | |
4ed5bcfb NB |
1065 | if (args[i].expanded) |
1066 | free (args[i].expanded); | |
1067 | ||
644eddaa | 1068 | push_ptoken_context (pfile, node, buff, first, dest - first); |
4ed5bcfb NB |
1069 | } |
1070 | ||
1071 | /* Return a special padding token, with padding inherited from SOURCE. */ | |
1072 | static const cpp_token * | |
6cf87ca4 | 1073 | padding_token (cpp_reader *pfile, const cpp_token *source) |
4ed5bcfb NB |
1074 | { |
1075 | cpp_token *result = _cpp_temp_token (pfile); | |
1076 | ||
1077 | result->type = CPP_PADDING; | |
be0f1e54 PB |
1078 | |
1079 | /* Data in GCed data structures cannot be made const so far, so we | |
1080 | need a cast here. */ | |
1081 | result->val.source = (cpp_token *) source; | |
4ed5bcfb NB |
1082 | result->flags = 0; |
1083 | return result; | |
1084 | } | |
1085 | ||
d15a58c0 NB |
1086 | /* Get a new uninitialized context. Create a new one if we cannot |
1087 | re-use an old one. */ | |
4ed5bcfb | 1088 | static cpp_context * |
6cf87ca4 | 1089 | next_context (cpp_reader *pfile) |
4ed5bcfb NB |
1090 | { |
1091 | cpp_context *result = pfile->context->next; | |
1092 | ||
1093 | if (result == 0) | |
711b8824 | 1094 | { |
72bb2c39 | 1095 | result = XNEW (cpp_context); |
4ed5bcfb NB |
1096 | result->prev = pfile->context; |
1097 | result->next = 0; | |
1098 | pfile->context->next = result; | |
93c80368 | 1099 | } |
4ed5bcfb NB |
1100 | |
1101 | pfile->context = result; | |
1102 | return result; | |
93c80368 NB |
1103 | } |
1104 | ||
4ed5bcfb NB |
1105 | /* Push a list of pointers to tokens. */ |
1106 | static void | |
6cf87ca4 ZW |
1107 | push_ptoken_context (cpp_reader *pfile, cpp_hashnode *macro, _cpp_buff *buff, |
1108 | const cpp_token **first, unsigned int count) | |
93c80368 NB |
1109 | { |
1110 | cpp_context *context = next_context (pfile); | |
93c80368 | 1111 | |
4ed5bcfb NB |
1112 | context->direct_p = false; |
1113 | context->macro = macro; | |
1e013d2e | 1114 | context->buff = buff; |
82eda77e NB |
1115 | FIRST (context).ptoken = first; |
1116 | LAST (context).ptoken = first + count; | |
4ed5bcfb NB |
1117 | } |
1118 | ||
1119 | /* Push a list of tokens. */ | |
bc4071dd RH |
1120 | void |
1121 | _cpp_push_token_context (cpp_reader *pfile, cpp_hashnode *macro, | |
1122 | const cpp_token *first, unsigned int count) | |
4ed5bcfb NB |
1123 | { |
1124 | cpp_context *context = next_context (pfile); | |
1125 | ||
1126 | context->direct_p = true; | |
1127 | context->macro = macro; | |
1e013d2e | 1128 | context->buff = NULL; |
82eda77e NB |
1129 | FIRST (context).token = first; |
1130 | LAST (context).token = first + count; | |
93c80368 NB |
1131 | } |
1132 | ||
cbc69f84 NB |
1133 | /* Push a traditional macro's replacement text. */ |
1134 | void | |
6cf87ca4 ZW |
1135 | _cpp_push_text_context (cpp_reader *pfile, cpp_hashnode *macro, |
1136 | const uchar *start, size_t len) | |
cbc69f84 NB |
1137 | { |
1138 | cpp_context *context = next_context (pfile); | |
1139 | ||
1140 | context->direct_p = true; | |
1141 | context->macro = macro; | |
1142 | context->buff = NULL; | |
1143 | CUR (context) = start; | |
1ce676a0 | 1144 | RLIMIT (context) = start + len; |
974c43f1 | 1145 | macro->flags |= NODE_DISABLED; |
cbc69f84 NB |
1146 | } |
1147 | ||
d15a58c0 NB |
1148 | /* Expand an argument ARG before replacing parameters in a |
1149 | function-like macro. This works by pushing a context with the | |
1150 | argument's tokens, and then expanding that into a temporary buffer | |
1151 | as if it were a normal part of the token stream. collect_args() | |
1152 | has terminated the argument's tokens with a CPP_EOF so that we know | |
1153 | when we have fully expanded the argument. */ | |
93c80368 | 1154 | static void |
6cf87ca4 | 1155 | expand_arg (cpp_reader *pfile, macro_arg *arg) |
93c80368 | 1156 | { |
4ed5bcfb | 1157 | unsigned int capacity; |
56941bf2 | 1158 | bool saved_warn_trad; |
4ed5bcfb | 1159 | |
4ed5bcfb NB |
1160 | if (arg->count == 0) |
1161 | return; | |
93c80368 | 1162 | |
56941bf2 NB |
1163 | /* Don't warn about funlike macros when pre-expanding. */ |
1164 | saved_warn_trad = CPP_WTRADITIONAL (pfile); | |
1165 | CPP_WTRADITIONAL (pfile) = 0; | |
1166 | ||
93c80368 | 1167 | /* Loop, reading in the arguments. */ |
4ed5bcfb | 1168 | capacity = 256; |
c3f829c1 | 1169 | arg->expanded = XNEWVEC (const cpp_token *, capacity); |
93c80368 | 1170 | |
1e013d2e | 1171 | push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); |
4ed5bcfb | 1172 | for (;;) |
93c80368 | 1173 | { |
4ed5bcfb NB |
1174 | const cpp_token *token; |
1175 | ||
1176 | if (arg->expanded_count + 1 >= capacity) | |
711b8824 | 1177 | { |
93c80368 | 1178 | capacity *= 2; |
c3f829c1 GDR |
1179 | arg->expanded = XRESIZEVEC (const cpp_token *, arg->expanded, |
1180 | capacity); | |
93c80368 | 1181 | } |
93c80368 | 1182 | |
4ed5bcfb | 1183 | token = cpp_get_token (pfile); |
93c80368 | 1184 | |
4ed5bcfb NB |
1185 | if (token->type == CPP_EOF) |
1186 | break; | |
1187 | ||
1188 | arg->expanded[arg->expanded_count++] = token; | |
1189 | } | |
1190 | ||
1e013d2e | 1191 | _cpp_pop_context (pfile); |
56941bf2 NB |
1192 | |
1193 | CPP_WTRADITIONAL (pfile) = saved_warn_trad; | |
93c80368 NB |
1194 | } |
1195 | ||
d15a58c0 NB |
1196 | /* Pop the current context off the stack, re-enabling the macro if the |
1197 | context represented a macro's replacement list. The context | |
1198 | structure is not freed so that we can re-use it later. */ | |
93c80368 | 1199 | void |
6cf87ca4 | 1200 | _cpp_pop_context (cpp_reader *pfile) |
93c80368 | 1201 | { |
1e013d2e NB |
1202 | cpp_context *context = pfile->context; |
1203 | ||
1e013d2e | 1204 | if (context->macro) |
644eddaa | 1205 | context->macro->flags &= ~NODE_DISABLED; |
1e013d2e NB |
1206 | |
1207 | if (context->buff) | |
1208 | _cpp_release_buff (pfile, context->buff); | |
93c80368 | 1209 | |
1e013d2e | 1210 | pfile->context = context->prev; |
93c80368 NB |
1211 | } |
1212 | ||
48c4721e | 1213 | /* External routine to get a token. Also used nearly everywhere |
7f2f1a66 | 1214 | internally, except for places where we know we can safely call |
48c4721e | 1215 | _cpp_lex_token directly, such as lexing a directive name. |
7f2f1a66 NB |
1216 | |
1217 | Macro expansions and directives are transparently handled, | |
1218 | including entering included files. Thus tokens are post-macro | |
1219 | expansion, and after any intervening directives. External callers | |
1220 | see CPP_EOF only at EOF. Internal callers also see it when meeting | |
1221 | a directive inside a macro call, when at the end of a directive and | |
1222 | state.in_directive is still 1, and at the end of argument | |
1223 | pre-expansion. */ | |
4ed5bcfb | 1224 | const cpp_token * |
6cf87ca4 | 1225 | cpp_get_token (cpp_reader *pfile) |
93c80368 | 1226 | { |
4ed5bcfb | 1227 | const cpp_token *result; |
5ffeb913 TT |
1228 | bool can_set = pfile->set_invocation_location; |
1229 | pfile->set_invocation_location = false; | |
4ed5bcfb | 1230 | |
29b10746 | 1231 | for (;;) |
93c80368 | 1232 | { |
4ed5bcfb | 1233 | cpp_hashnode *node; |
93c80368 NB |
1234 | cpp_context *context = pfile->context; |
1235 | ||
93c80368 | 1236 | /* Context->prev == 0 <=> base context. */ |
bdcbe496 | 1237 | if (!context->prev) |
4ed5bcfb | 1238 | result = _cpp_lex_token (pfile); |
82eda77e | 1239 | else if (FIRST (context).token != LAST (context).token) |
29b10746 | 1240 | { |
4ed5bcfb | 1241 | if (context->direct_p) |
82eda77e | 1242 | result = FIRST (context).token++; |
4ed5bcfb | 1243 | else |
82eda77e | 1244 | result = *FIRST (context).ptoken++; |
4ed5bcfb NB |
1245 | |
1246 | if (result->flags & PASTE_LEFT) | |
ec1a23e6 | 1247 | { |
4ed5bcfb NB |
1248 | paste_all_tokens (pfile, result); |
1249 | if (pfile->state.in_directive) | |
1250 | continue; | |
1251 | return padding_token (pfile, result); | |
ec1a23e6 | 1252 | } |
29b10746 | 1253 | } |
93c80368 NB |
1254 | else |
1255 | { | |
bdcbe496 | 1256 | _cpp_pop_context (pfile); |
4ed5bcfb NB |
1257 | if (pfile->state.in_directive) |
1258 | continue; | |
1259 | return &pfile->avoid_paste; | |
93c80368 | 1260 | } |
93c80368 | 1261 | |
477cdac7 JT |
1262 | if (pfile->state.in_directive && result->type == CPP_COMMENT) |
1263 | continue; | |
1264 | ||
4ed5bcfb | 1265 | if (result->type != CPP_NAME) |
93c80368 NB |
1266 | break; |
1267 | ||
9a0c6187 | 1268 | node = result->val.node.node; |
4ed5bcfb | 1269 | |
644eddaa NB |
1270 | if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) |
1271 | break; | |
df383483 | 1272 | |
644eddaa | 1273 | if (!(node->flags & NODE_DISABLED)) |
93c80368 | 1274 | { |
5950c3c9 | 1275 | int ret = 0; |
5ffeb913 TT |
1276 | /* If not in a macro context, and we're going to start an |
1277 | expansion, record the location. */ | |
1278 | if (can_set && !context->macro) | |
1279 | pfile->invocation_location = result->src_loc; | |
765d600a JJ |
1280 | if (pfile->state.prevent_expansion) |
1281 | break; | |
5950c3c9 BE |
1282 | |
1283 | /* Conditional macros require that a predicate be evaluated | |
1284 | first. */ | |
a37a7b8a JJ |
1285 | if ((node->flags & NODE_CONDITIONAL) != 0) |
1286 | { | |
1287 | if (pfile->cb.macro_to_expand) | |
1288 | { | |
1289 | bool whitespace_after; | |
1290 | const cpp_token *peek_tok = cpp_peek_token (pfile, 0); | |
1291 | ||
1292 | whitespace_after = (peek_tok->type == CPP_PADDING | |
1293 | || (peek_tok->flags & PREV_WHITE)); | |
1294 | node = pfile->cb.macro_to_expand (pfile, result); | |
1295 | if (node) | |
1296 | ret = enter_macro_context (pfile, node, result); | |
1297 | else if (whitespace_after) | |
1298 | { | |
1299 | /* If macro_to_expand hook returned NULL and it | |
1300 | ate some tokens, see if we don't need to add | |
1301 | a padding token in between this and the | |
1302 | next token. */ | |
1303 | peek_tok = cpp_peek_token (pfile, 0); | |
1304 | if (peek_tok->type != CPP_PADDING | |
1305 | && (peek_tok->flags & PREV_WHITE) == 0) | |
1306 | _cpp_push_token_context (pfile, NULL, | |
1307 | padding_token (pfile, | |
1308 | peek_tok), 1); | |
1309 | } | |
1310 | } | |
1311 | } | |
1312 | else | |
1313 | ret = enter_macro_context (pfile, node, result); | |
1314 | if (ret) | |
5950c3c9 | 1315 | { |
765d600a | 1316 | if (pfile->state.in_directive || ret == 2) |
4ed5bcfb NB |
1317 | continue; |
1318 | return padding_token (pfile, result); | |
bd969772 | 1319 | } |
93c80368 | 1320 | } |
644eddaa NB |
1321 | else |
1322 | { | |
d15a58c0 NB |
1323 | /* Flag this token as always unexpandable. FIXME: move this |
1324 | to collect_args()?. */ | |
644eddaa NB |
1325 | cpp_token *t = _cpp_temp_token (pfile); |
1326 | t->type = result->type; | |
1327 | t->flags = result->flags | NO_EXPAND; | |
73096711 | 1328 | t->val = result->val; |
644eddaa NB |
1329 | result = t; |
1330 | } | |
a5c3cccd | 1331 | |
644eddaa | 1332 | break; |
93c80368 | 1333 | } |
4ed5bcfb NB |
1334 | |
1335 | return result; | |
93c80368 NB |
1336 | } |
1337 | ||
5ffeb913 TT |
1338 | /* Like cpp_get_token, but also returns a location separate from the |
1339 | one provided by the returned token. LOC is an out parameter; *LOC | |
1340 | is set to the location "as expected by the user". This matters | |
1341 | when a token results from macro expansion -- the token's location | |
1342 | will indicate where the macro is defined, but *LOC will be the | |
1343 | location of the start of the expansion. */ | |
1344 | const cpp_token * | |
1345 | cpp_get_token_with_location (cpp_reader *pfile, source_location *loc) | |
1346 | { | |
1347 | const cpp_token *result; | |
1348 | ||
1349 | pfile->set_invocation_location = true; | |
1350 | result = cpp_get_token (pfile); | |
1351 | if (pfile->context->macro) | |
1352 | *loc = pfile->invocation_location; | |
1353 | else | |
1354 | *loc = result->src_loc; | |
1355 | ||
1356 | return result; | |
1357 | } | |
1358 | ||
7065e130 NB |
1359 | /* Returns true if we're expanding an object-like macro that was |
1360 | defined in a system header. Just checks the macro at the top of | |
1361 | the stack. Used for diagnostic suppression. */ | |
1362 | int | |
6cf87ca4 | 1363 | cpp_sys_macro_p (cpp_reader *pfile) |
7065e130 | 1364 | { |
644eddaa | 1365 | cpp_hashnode *node = pfile->context->macro; |
7065e130 | 1366 | |
644eddaa | 1367 | return node && node->value.macro && node->value.macro->syshdr; |
7065e130 NB |
1368 | } |
1369 | ||
af0d16cd NB |
1370 | /* Read each token in, until end of the current file. Directives are |
1371 | transparently processed. */ | |
93c80368 | 1372 | void |
6cf87ca4 | 1373 | cpp_scan_nooutput (cpp_reader *pfile) |
93c80368 | 1374 | { |
22234f56 PB |
1375 | /* Request a CPP_EOF token at the end of this file, rather than |
1376 | transparently continuing with the including file. */ | |
1377 | pfile->buffer->return_at_eof = true; | |
1378 | ||
c6e83800 ZW |
1379 | pfile->state.discarding_output++; |
1380 | pfile->state.prevent_expansion++; | |
1381 | ||
590e1987 NB |
1382 | if (CPP_OPTION (pfile, traditional)) |
1383 | while (_cpp_read_logical_line_trad (pfile)) | |
1384 | ; | |
1385 | else | |
1386 | while (cpp_get_token (pfile)->type != CPP_EOF) | |
1387 | ; | |
c6e83800 ZW |
1388 | |
1389 | pfile->state.discarding_output--; | |
1390 | pfile->state.prevent_expansion--; | |
93c80368 NB |
1391 | } |
1392 | ||
5950c3c9 BE |
1393 | /* Step back one or more tokens obtained from the lexer. */ |
1394 | void | |
1395 | _cpp_backup_tokens_direct (cpp_reader *pfile, unsigned int count) | |
1396 | { | |
1397 | pfile->lookaheads += count; | |
1398 | while (count--) | |
1399 | { | |
1400 | pfile->cur_token--; | |
1401 | if (pfile->cur_token == pfile->cur_run->base | |
1402 | /* Possible with -fpreprocessed and no leading #line. */ | |
1403 | && pfile->cur_run->prev != NULL) | |
1404 | { | |
1405 | pfile->cur_run = pfile->cur_run->prev; | |
1406 | pfile->cur_token = pfile->cur_run->limit; | |
1407 | } | |
1408 | } | |
1409 | } | |
1410 | ||
1c90c6f9 | 1411 | /* Step back one (or more) tokens. Can only step back more than 1 if |
bdcbe496 | 1412 | they are from the lexer, and not from macro expansion. */ |
b528a07e | 1413 | void |
6cf87ca4 | 1414 | _cpp_backup_tokens (cpp_reader *pfile, unsigned int count) |
93c80368 | 1415 | { |
bdcbe496 | 1416 | if (pfile->context->prev == NULL) |
5950c3c9 | 1417 | _cpp_backup_tokens_direct (pfile, count); |
bdcbe496 | 1418 | else |
93c80368 | 1419 | { |
bdcbe496 NB |
1420 | if (count != 1) |
1421 | abort (); | |
4ed5bcfb | 1422 | if (pfile->context->direct_p) |
82eda77e | 1423 | FIRST (pfile->context).token--; |
4ed5bcfb | 1424 | else |
82eda77e | 1425 | FIRST (pfile->context).ptoken--; |
93c80368 NB |
1426 | } |
1427 | } | |
711b8824 | 1428 | |
93c80368 NB |
1429 | /* #define directive parsing and handling. */ |
1430 | ||
da7d8304 | 1431 | /* Returns nonzero if a macro redefinition warning is required. */ |
cbc69f84 | 1432 | static bool |
6cf87ca4 ZW |
1433 | warn_of_redefinition (cpp_reader *pfile, const cpp_hashnode *node, |
1434 | const cpp_macro *macro2) | |
93c80368 NB |
1435 | { |
1436 | const cpp_macro *macro1; | |
1437 | unsigned int i; | |
1438 | ||
618cdda7 NB |
1439 | /* Some redefinitions need to be warned about regardless. */ |
1440 | if (node->flags & NODE_WARN) | |
cbc69f84 | 1441 | return true; |
93c80368 | 1442 | |
c047ce93 SB |
1443 | /* Suppress warnings for builtins that lack the NODE_WARN flag. */ |
1444 | if (node->flags & NODE_BUILTIN) | |
1445 | return false; | |
1446 | ||
5950c3c9 BE |
1447 | /* Redefinitions of conditional (context-sensitive) macros, on |
1448 | the other hand, must be allowed silently. */ | |
1449 | if (node->flags & NODE_CONDITIONAL) | |
1450 | return false; | |
1451 | ||
618cdda7 | 1452 | /* Redefinition of a macro is allowed if and only if the old and new |
ec5c56db | 1453 | definitions are the same. (6.10.3 paragraph 2). */ |
93c80368 NB |
1454 | macro1 = node->value.macro; |
1455 | ||
6618c5d4 NB |
1456 | /* Don't check count here as it can be different in valid |
1457 | traditional redefinitions with just whitespace differences. */ | |
1458 | if (macro1->paramc != macro2->paramc | |
93c80368 | 1459 | || macro1->fun_like != macro2->fun_like |
28e0f040 | 1460 | || macro1->variadic != macro2->variadic) |
cbc69f84 | 1461 | return true; |
93c80368 NB |
1462 | |
1463 | /* Check parameter spellings. */ | |
1464 | for (i = 0; i < macro1->paramc; i++) | |
1465 | if (macro1->params[i] != macro2->params[i]) | |
cbc69f84 | 1466 | return true; |
93c80368 | 1467 | |
cbc69f84 NB |
1468 | /* Check the replacement text or tokens. */ |
1469 | if (CPP_OPTION (pfile, traditional)) | |
6618c5d4 | 1470 | return _cpp_expansions_different_trad (macro1, macro2); |
cbc69f84 | 1471 | |
a7f36da3 DD |
1472 | if (macro1->count != macro2->count) |
1473 | return true; | |
1474 | ||
1475 | for (i = 0; i < macro1->count; i++) | |
1476 | if (!_cpp_equiv_tokens (¯o1->exp.tokens[i], ¯o2->exp.tokens[i])) | |
1477 | return true; | |
cbc69f84 NB |
1478 | |
1479 | return false; | |
93c80368 NB |
1480 | } |
1481 | ||
1482 | /* Free the definition of hashnode H. */ | |
711b8824 | 1483 | void |
6cf87ca4 | 1484 | _cpp_free_definition (cpp_hashnode *h) |
711b8824 | 1485 | { |
93c80368 NB |
1486 | /* Macros and assertions no longer have anything to free. */ |
1487 | h->type = NT_VOID; | |
1488 | /* Clear builtin flag in case of redefinition. */ | |
93d45d9e | 1489 | h->flags &= ~(NODE_BUILTIN | NODE_DISABLED | NODE_USED); |
93c80368 NB |
1490 | } |
1491 | ||
14baae01 | 1492 | /* Save parameter NODE to the parameter list of macro MACRO. Returns |
da7d8304 | 1493 | zero on success, nonzero if the parameter is a duplicate. */ |
c70f6ed3 | 1494 | bool |
6cf87ca4 | 1495 | _cpp_save_parameter (cpp_reader *pfile, cpp_macro *macro, cpp_hashnode *node) |
93c80368 | 1496 | { |
4977bab6 | 1497 | unsigned int len; |
93c80368 | 1498 | /* Constraint 6.10.3.6 - duplicate parameter names. */ |
4977bab6 | 1499 | if (node->flags & NODE_MACRO_ARG) |
709e9e50 | 1500 | { |
0527bc4e | 1501 | cpp_error (pfile, CPP_DL_ERROR, "duplicate macro parameter \"%s\"", |
ebef4e8c | 1502 | NODE_NAME (node)); |
23ff0223 | 1503 | return true; |
93c80368 | 1504 | } |
709e9e50 | 1505 | |
8c3b2693 NB |
1506 | if (BUFF_ROOM (pfile->a_buff) |
1507 | < (macro->paramc + 1) * sizeof (cpp_hashnode *)) | |
1508 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); | |
709e9e50 | 1509 | |
8c3b2693 | 1510 | ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; |
4977bab6 ZW |
1511 | node->flags |= NODE_MACRO_ARG; |
1512 | len = macro->paramc * sizeof (union _cpp_hashnode_value); | |
1513 | if (len > pfile->macro_buffer_len) | |
1514 | { | |
c3f829c1 GDR |
1515 | pfile->macro_buffer = XRESIZEVEC (unsigned char, pfile->macro_buffer, |
1516 | len); | |
4977bab6 ZW |
1517 | pfile->macro_buffer_len = len; |
1518 | } | |
1519 | ((union _cpp_hashnode_value *) pfile->macro_buffer)[macro->paramc - 1] | |
1520 | = node->value; | |
1521 | ||
1522 | node->value.arg_index = macro->paramc; | |
23ff0223 | 1523 | return false; |
711b8824 ZW |
1524 | } |
1525 | ||
23ff0223 NB |
1526 | /* Check the syntax of the parameters in a MACRO definition. Returns |
1527 | false if an error occurs. */ | |
1528 | static bool | |
6cf87ca4 | 1529 | parse_params (cpp_reader *pfile, cpp_macro *macro) |
711b8824 | 1530 | { |
93c80368 | 1531 | unsigned int prev_ident = 0; |
711b8824 | 1532 | |
93c80368 | 1533 | for (;;) |
711b8824 | 1534 | { |
345894b4 | 1535 | const cpp_token *token = _cpp_lex_token (pfile); |
711b8824 | 1536 | |
345894b4 | 1537 | switch (token->type) |
711b8824 | 1538 | { |
93c80368 | 1539 | default: |
477cdac7 JT |
1540 | /* Allow/ignore comments in parameter lists if we are |
1541 | preserving comments in macro expansions. */ | |
1542 | if (token->type == CPP_COMMENT | |
1543 | && ! CPP_OPTION (pfile, discard_comments_in_macro_exp)) | |
1544 | continue; | |
1545 | ||
0527bc4e | 1546 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1547 | "\"%s\" may not appear in macro parameter list", |
345894b4 | 1548 | cpp_token_as_text (pfile, token)); |
23ff0223 | 1549 | return false; |
93c80368 | 1550 | |
711b8824 | 1551 | case CPP_NAME: |
93c80368 NB |
1552 | if (prev_ident) |
1553 | { | |
0527bc4e | 1554 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1555 | "macro parameters must be comma-separated"); |
23ff0223 | 1556 | return false; |
93c80368 NB |
1557 | } |
1558 | prev_ident = 1; | |
1559 | ||
9a0c6187 | 1560 | if (_cpp_save_parameter (pfile, macro, token->val.node.node)) |
23ff0223 | 1561 | return false; |
93c80368 | 1562 | continue; |
711b8824 | 1563 | |
93c80368 NB |
1564 | case CPP_CLOSE_PAREN: |
1565 | if (prev_ident || macro->paramc == 0) | |
23ff0223 | 1566 | return true; |
711b8824 | 1567 | |
93c80368 NB |
1568 | /* Fall through to pick up the error. */ |
1569 | case CPP_COMMA: | |
1570 | if (!prev_ident) | |
1571 | { | |
0527bc4e | 1572 | cpp_error (pfile, CPP_DL_ERROR, "parameter name missing"); |
23ff0223 | 1573 | return false; |
93c80368 NB |
1574 | } |
1575 | prev_ident = 0; | |
711b8824 ZW |
1576 | continue; |
1577 | ||
93c80368 | 1578 | case CPP_ELLIPSIS: |
28e0f040 | 1579 | macro->variadic = 1; |
93c80368 NB |
1580 | if (!prev_ident) |
1581 | { | |
c70f6ed3 NB |
1582 | _cpp_save_parameter (pfile, macro, |
1583 | pfile->spec_nodes.n__VA_ARGS__); | |
93c80368 | 1584 | pfile->state.va_args_ok = 1; |
e5b79219 RH |
1585 | if (! CPP_OPTION (pfile, c99) |
1586 | && CPP_OPTION (pfile, pedantic) | |
1587 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
0527bc4e | 1588 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebef4e8c | 1589 | "anonymous variadic macros were introduced in C99"); |
93c80368 | 1590 | } |
e5b79219 RH |
1591 | else if (CPP_OPTION (pfile, pedantic) |
1592 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
0527bc4e | 1593 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebef4e8c | 1594 | "ISO C does not permit named variadic macros"); |
711b8824 | 1595 | |
93c80368 | 1596 | /* We're at the end, and just expect a closing parenthesis. */ |
345894b4 NB |
1597 | token = _cpp_lex_token (pfile); |
1598 | if (token->type == CPP_CLOSE_PAREN) | |
23ff0223 | 1599 | return true; |
93c80368 | 1600 | /* Fall through. */ |
711b8824 | 1601 | |
93c80368 | 1602 | case CPP_EOF: |
0527bc4e | 1603 | cpp_error (pfile, CPP_DL_ERROR, "missing ')' in macro parameter list"); |
23ff0223 | 1604 | return false; |
711b8824 | 1605 | } |
711b8824 | 1606 | } |
93c80368 NB |
1607 | } |
1608 | ||
14baae01 | 1609 | /* Allocate room for a token from a macro's replacement list. */ |
93c80368 | 1610 | static cpp_token * |
6cf87ca4 | 1611 | alloc_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
93c80368 | 1612 | { |
8c3b2693 NB |
1613 | if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) |
1614 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); | |
711b8824 | 1615 | |
8c3b2693 | 1616 | return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; |
14baae01 NB |
1617 | } |
1618 | ||
d15a58c0 NB |
1619 | /* Lex a token from the expansion of MACRO, but mark parameters as we |
1620 | find them and warn of traditional stringification. */ | |
14baae01 | 1621 | static cpp_token * |
6cf87ca4 | 1622 | lex_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
14baae01 | 1623 | { |
ee380365 | 1624 | cpp_token *token, *saved_cur_token; |
14baae01 | 1625 | |
ee380365 | 1626 | saved_cur_token = pfile->cur_token; |
14baae01 NB |
1627 | pfile->cur_token = alloc_expansion_token (pfile, macro); |
1628 | token = _cpp_lex_direct (pfile); | |
ee380365 | 1629 | pfile->cur_token = saved_cur_token; |
93c80368 | 1630 | |
d15a58c0 | 1631 | /* Is this a parameter? */ |
4977bab6 | 1632 | if (token->type == CPP_NAME |
9a0c6187 | 1633 | && (token->val.node.node->flags & NODE_MACRO_ARG) != 0) |
93c80368 NB |
1634 | { |
1635 | token->type = CPP_MACRO_ARG; | |
9a0c6187 | 1636 | token->val.macro_arg.arg_no = token->val.node.node->value.arg_index; |
93c80368 NB |
1637 | } |
1638 | else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 | |
1639 | && (token->type == CPP_STRING || token->type == CPP_CHAR)) | |
1640 | check_trad_stringification (pfile, macro, &token->val.str); | |
1641 | ||
1642 | return token; | |
711b8824 ZW |
1643 | } |
1644 | ||
cbc69f84 | 1645 | static bool |
6cf87ca4 | 1646 | create_iso_definition (cpp_reader *pfile, cpp_macro *macro) |
711b8824 | 1647 | { |
cbc69f84 | 1648 | cpp_token *token; |
14baae01 | 1649 | const cpp_token *ctoken; |
126e073b SM |
1650 | bool following_paste_op = false; |
1651 | const char *paste_op_error_msg = | |
1652 | N_("'##' cannot appear at either end of a macro expansion"); | |
aa508502 | 1653 | unsigned int num_extra_tokens = 0; |
93c80368 NB |
1654 | |
1655 | /* Get the first token of the expansion (or the '(' of a | |
1656 | function-like macro). */ | |
14baae01 NB |
1657 | ctoken = _cpp_lex_token (pfile); |
1658 | ||
1659 | if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) | |
93c80368 | 1660 | { |
cbc69f84 | 1661 | bool ok = parse_params (pfile, macro); |
8c3b2693 NB |
1662 | macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); |
1663 | if (!ok) | |
cbc69f84 | 1664 | return false; |
8c3b2693 | 1665 | |
d8044160 GK |
1666 | /* Success. Commit or allocate the parameter array. */ |
1667 | if (pfile->hash_table->alloc_subobject) | |
1668 | { | |
c3f829c1 GDR |
1669 | cpp_hashnode **params = |
1670 | (cpp_hashnode **) pfile->hash_table->alloc_subobject | |
1671 | (sizeof (cpp_hashnode *) * macro->paramc); | |
be0f1e54 PB |
1672 | memcpy (params, macro->params, |
1673 | sizeof (cpp_hashnode *) * macro->paramc); | |
1674 | macro->params = params; | |
d8044160 GK |
1675 | } |
1676 | else | |
1677 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->params[macro->paramc]; | |
93c80368 | 1678 | macro->fun_like = 1; |
93c80368 | 1679 | } |
14baae01 | 1680 | else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) |
cae064e7 JJ |
1681 | { |
1682 | /* While ISO C99 requires whitespace before replacement text | |
1683 | in a macro definition, ISO C90 with TC1 allows there characters | |
1684 | from the basic source character set. */ | |
1685 | if (CPP_OPTION (pfile, c99)) | |
1686 | cpp_error (pfile, CPP_DL_PEDWARN, | |
1687 | "ISO C99 requires whitespace after the macro name"); | |
1688 | else | |
1689 | { | |
1690 | int warntype = CPP_DL_WARNING; | |
1691 | switch (ctoken->type) | |
1692 | { | |
1693 | case CPP_ATSIGN: | |
1694 | case CPP_AT_NAME: | |
1695 | case CPP_OBJC_STRING: | |
1696 | /* '@' is not in basic character set. */ | |
1697 | warntype = CPP_DL_PEDWARN; | |
1698 | break; | |
1699 | case CPP_OTHER: | |
1700 | /* Basic character set sans letters, digits and _. */ | |
1701 | if (strchr ("!\"#%&'()*+,-./:;<=>?[\\]^{|}~", | |
1702 | ctoken->val.str.text[0]) == NULL) | |
1703 | warntype = CPP_DL_PEDWARN; | |
1704 | break; | |
1705 | default: | |
1706 | /* All other tokens start with a character from basic | |
1707 | character set. */ | |
1708 | break; | |
1709 | } | |
1710 | cpp_error (pfile, warntype, | |
1711 | "missing whitespace after the macro name"); | |
1712 | } | |
1713 | } | |
711b8824 | 1714 | |
14baae01 NB |
1715 | if (macro->fun_like) |
1716 | token = lex_expansion_token (pfile, macro); | |
1717 | else | |
1718 | { | |
1719 | token = alloc_expansion_token (pfile, macro); | |
1720 | *token = *ctoken; | |
1721 | } | |
711b8824 | 1722 | |
93c80368 NB |
1723 | for (;;) |
1724 | { | |
1725 | /* Check the stringifying # constraint 6.10.3.2.1 of | |
1726 | function-like macros when lexing the subsequent token. */ | |
1727 | if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) | |
1728 | { | |
1729 | if (token->type == CPP_MACRO_ARG) | |
1730 | { | |
aa508502 JM |
1731 | if (token->flags & PREV_WHITE) |
1732 | token->flags |= SP_PREV_WHITE; | |
1733 | if (token[-1].flags & DIGRAPH) | |
1734 | token->flags |= SP_DIGRAPH; | |
93c80368 NB |
1735 | token->flags &= ~PREV_WHITE; |
1736 | token->flags |= STRINGIFY_ARG; | |
1737 | token->flags |= token[-1].flags & PREV_WHITE; | |
1738 | token[-1] = token[0]; | |
1739 | macro->count--; | |
1740 | } | |
1741 | /* Let assembler get away with murder. */ | |
bdb05a7b | 1742 | else if (CPP_OPTION (pfile, lang) != CLK_ASM) |
93c80368 | 1743 | { |
0527bc4e | 1744 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1745 | "'#' is not followed by a macro parameter"); |
cbc69f84 | 1746 | return false; |
93c80368 NB |
1747 | } |
1748 | } | |
1749 | ||
1750 | if (token->type == CPP_EOF) | |
126e073b SM |
1751 | { |
1752 | /* Paste operator constraint 6.10.3.3.1: | |
1753 | Token-paste ##, can appear in both object-like and | |
1754 | function-like macros, but not at the end. */ | |
1755 | if (following_paste_op) | |
1756 | { | |
1757 | cpp_error (pfile, CPP_DL_ERROR, paste_op_error_msg); | |
1758 | return false; | |
1759 | } | |
1760 | break; | |
1761 | } | |
93c80368 NB |
1762 | |
1763 | /* Paste operator constraint 6.10.3.3.1. */ | |
1764 | if (token->type == CPP_PASTE) | |
1765 | { | |
1766 | /* Token-paste ##, can appear in both object-like and | |
126e073b SM |
1767 | function-like macros, but not at the beginning. */ |
1768 | if (macro->count == 1) | |
93c80368 | 1769 | { |
126e073b | 1770 | cpp_error (pfile, CPP_DL_ERROR, paste_op_error_msg); |
cbc69f84 | 1771 | return false; |
93c80368 | 1772 | } |
711b8824 | 1773 | |
aa508502 JM |
1774 | if (token[-1].flags & PASTE_LEFT) |
1775 | { | |
1776 | macro->extra_tokens = 1; | |
1777 | num_extra_tokens++; | |
9a0c6187 | 1778 | token->val.token_no = macro->count - 1; |
aa508502 JM |
1779 | } |
1780 | else | |
1781 | { | |
1782 | --macro->count; | |
1783 | token[-1].flags |= PASTE_LEFT; | |
1784 | if (token->flags & DIGRAPH) | |
1785 | token[-1].flags |= SP_DIGRAPH; | |
1786 | if (token->flags & PREV_WHITE) | |
1787 | token[-1].flags |= SP_PREV_WHITE; | |
1788 | } | |
93c80368 NB |
1789 | } |
1790 | ||
126e073b | 1791 | following_paste_op = (token->type == CPP_PASTE); |
93c80368 NB |
1792 | token = lex_expansion_token (pfile, macro); |
1793 | } | |
1794 | ||
601328bb | 1795 | macro->exp.tokens = (cpp_token *) BUFF_FRONT (pfile->a_buff); |
d8044160 | 1796 | macro->traditional = 0; |
8c3b2693 | 1797 | |
4c2b647d NB |
1798 | /* Don't count the CPP_EOF. */ |
1799 | macro->count--; | |
93c80368 | 1800 | |
d15a58c0 | 1801 | /* Clear whitespace on first token for warn_of_redefinition(). */ |
8c3b2693 | 1802 | if (macro->count) |
601328bb | 1803 | macro->exp.tokens[0].flags &= ~PREV_WHITE; |
8c3b2693 | 1804 | |
d8044160 GK |
1805 | /* Commit or allocate the memory. */ |
1806 | if (pfile->hash_table->alloc_subobject) | |
1807 | { | |
c3f829c1 GDR |
1808 | cpp_token *tokns = |
1809 | (cpp_token *) pfile->hash_table->alloc_subobject (sizeof (cpp_token) | |
1810 | * macro->count); | |
aa508502 JM |
1811 | if (num_extra_tokens) |
1812 | { | |
1813 | /* Place second and subsequent ## or %:%: tokens in | |
1814 | sequences of consecutive such tokens at the end of the | |
1815 | list to preserve information about where they appear, how | |
1816 | they are spelt and whether they are preceded by | |
1817 | whitespace without otherwise interfering with macro | |
1818 | expansion. */ | |
1819 | cpp_token *normal_dest = tokns; | |
1820 | cpp_token *extra_dest = tokns + macro->count - num_extra_tokens; | |
1821 | unsigned int i; | |
1822 | for (i = 0; i < macro->count; i++) | |
1823 | { | |
1824 | if (macro->exp.tokens[i].type == CPP_PASTE) | |
1825 | *extra_dest++ = macro->exp.tokens[i]; | |
1826 | else | |
1827 | *normal_dest++ = macro->exp.tokens[i]; | |
1828 | } | |
1829 | } | |
1830 | else | |
1831 | memcpy (tokns, macro->exp.tokens, sizeof (cpp_token) * macro->count); | |
d8044160 GK |
1832 | macro->exp.tokens = tokns; |
1833 | } | |
1834 | else | |
1835 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->exp.tokens[macro->count]; | |
8c3b2693 | 1836 | |
cbc69f84 NB |
1837 | return true; |
1838 | } | |
1839 | ||
da7d8304 | 1840 | /* Parse a macro and save its expansion. Returns nonzero on success. */ |
cbc69f84 | 1841 | bool |
6cf87ca4 | 1842 | _cpp_create_definition (cpp_reader *pfile, cpp_hashnode *node) |
cbc69f84 NB |
1843 | { |
1844 | cpp_macro *macro; | |
1845 | unsigned int i; | |
1846 | bool ok; | |
44ed91a1 | 1847 | |
d8044160 | 1848 | if (pfile->hash_table->alloc_subobject) |
c3f829c1 GDR |
1849 | macro = (cpp_macro *) pfile->hash_table->alloc_subobject |
1850 | (sizeof (cpp_macro)); | |
d8044160 GK |
1851 | else |
1852 | macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); | |
cbc69f84 NB |
1853 | macro->line = pfile->directive_line; |
1854 | macro->params = 0; | |
1855 | macro->paramc = 0; | |
1856 | macro->variadic = 0; | |
23345bbb | 1857 | macro->used = !CPP_OPTION (pfile, warn_unused_macros); |
cbc69f84 NB |
1858 | macro->count = 0; |
1859 | macro->fun_like = 0; | |
aa508502 | 1860 | macro->extra_tokens = 0; |
7065e130 | 1861 | /* To suppress some diagnostics. */ |
12f9df4e | 1862 | macro->syshdr = pfile->buffer && pfile->buffer->sysp != 0; |
7065e130 | 1863 | |
cbc69f84 NB |
1864 | if (CPP_OPTION (pfile, traditional)) |
1865 | ok = _cpp_create_trad_definition (pfile, macro); | |
1866 | else | |
1867 | { | |
cbc69f84 NB |
1868 | ok = create_iso_definition (pfile, macro); |
1869 | ||
ee380365 | 1870 | /* We set the type for SEEN_EOL() in directives.c. |
cbc69f84 NB |
1871 | |
1872 | Longer term we should lex the whole line before coming here, | |
1873 | and just copy the expansion. */ | |
cbc69f84 NB |
1874 | |
1875 | /* Stop the lexer accepting __VA_ARGS__. */ | |
1876 | pfile->state.va_args_ok = 0; | |
1877 | } | |
1878 | ||
1879 | /* Clear the fast argument lookup indices. */ | |
1880 | for (i = macro->paramc; i-- > 0; ) | |
4977bab6 ZW |
1881 | { |
1882 | struct cpp_hashnode *node = macro->params[i]; | |
1883 | node->flags &= ~ NODE_MACRO_ARG; | |
1884 | node->value = ((union _cpp_hashnode_value *) pfile->macro_buffer)[i]; | |
1885 | } | |
cbc69f84 NB |
1886 | |
1887 | if (!ok) | |
1888 | return ok; | |
1889 | ||
c2734e05 | 1890 | if (node->type == NT_MACRO) |
711b8824 | 1891 | { |
a69cbaac NB |
1892 | if (CPP_OPTION (pfile, warn_unused_macros)) |
1893 | _cpp_warn_if_unused_macro (pfile, node, NULL); | |
1894 | ||
cbc69f84 | 1895 | if (warn_of_redefinition (pfile, node, macro)) |
711b8824 | 1896 | { |
148e4216 JM |
1897 | bool warned; |
1898 | warned = cpp_error_with_line (pfile, CPP_DL_PEDWARN, | |
1899 | pfile->directive_line, 0, | |
1900 | "\"%s\" redefined", NODE_NAME (node)); | |
93c80368 | 1901 | |
148e4216 JM |
1902 | if (warned && node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) |
1903 | cpp_error_with_line (pfile, CPP_DL_NOTE, | |
cbc69f84 NB |
1904 | node->value.macro->line, 0, |
1905 | "this is the location of the previous definition"); | |
711b8824 | 1906 | } |
711b8824 ZW |
1907 | } |
1908 | ||
c2734e05 NB |
1909 | if (node->type != NT_VOID) |
1910 | _cpp_free_definition (node); | |
1911 | ||
711b8824 | 1912 | /* Enter definition in hash table. */ |
93c80368 NB |
1913 | node->type = NT_MACRO; |
1914 | node->value.macro = macro; | |
607f74e9 | 1915 | if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_")) |
ec46053b TT |
1916 | && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_FORMAT_MACROS") |
1917 | /* __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS are mentioned | |
1918 | in the C standard, as something that one must use in C++. | |
1919 | However DR#593 indicates that these aren't actually mentioned | |
1920 | in the C++ standard. We special-case them anyway. */ | |
1921 | && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_LIMIT_MACROS") | |
1922 | && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_CONSTANT_MACROS")) | |
618cdda7 | 1923 | node->flags |= NODE_WARN; |
711b8824 | 1924 | |
5950c3c9 BE |
1925 | /* If user defines one of the conditional macros, remove the |
1926 | conditional flag */ | |
1927 | node->flags &= ~NODE_CONDITIONAL; | |
1928 | ||
93c80368 | 1929 | return ok; |
711b8824 ZW |
1930 | } |
1931 | ||
d15a58c0 NB |
1932 | /* Warn if a token in STRING matches one of a function-like MACRO's |
1933 | parameters. */ | |
e1aa5140 | 1934 | static void |
6cf87ca4 ZW |
1935 | check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro, |
1936 | const cpp_string *string) | |
e1aa5140 | 1937 | { |
93c80368 | 1938 | unsigned int i, len; |
6338b358 | 1939 | const uchar *p, *q, *limit; |
df383483 | 1940 | |
e1aa5140 | 1941 | /* Loop over the string. */ |
6338b358 NB |
1942 | limit = string->text + string->len - 1; |
1943 | for (p = string->text + 1; p < limit; p = q) | |
e1aa5140 | 1944 | { |
e1aa5140 | 1945 | /* Find the start of an identifier. */ |
61c16b10 GM |
1946 | while (p < limit && !is_idstart (*p)) |
1947 | p++; | |
e1aa5140 KG |
1948 | |
1949 | /* Find the end of the identifier. */ | |
1950 | q = p; | |
61c16b10 GM |
1951 | while (q < limit && is_idchar (*q)) |
1952 | q++; | |
93c80368 NB |
1953 | |
1954 | len = q - p; | |
1955 | ||
e1aa5140 KG |
1956 | /* Loop over the function macro arguments to see if the |
1957 | identifier inside the string matches one of them. */ | |
93c80368 NB |
1958 | for (i = 0; i < macro->paramc; i++) |
1959 | { | |
1960 | const cpp_hashnode *node = macro->params[i]; | |
e1aa5140 | 1961 | |
2a967f3d NB |
1962 | if (NODE_LEN (node) == len |
1963 | && !memcmp (p, NODE_NAME (node), len)) | |
e1aa5140 | 1964 | { |
0527bc4e | 1965 | cpp_error (pfile, CPP_DL_WARNING, |
f458d1d5 | 1966 | "macro argument \"%s\" would be stringified in traditional C", |
ebef4e8c | 1967 | NODE_NAME (node)); |
e1aa5140 KG |
1968 | break; |
1969 | } | |
1970 | } | |
1971 | } | |
1972 | } | |
93c80368 | 1973 | |
7096171b NB |
1974 | /* Returns the name, arguments and expansion of a macro, in a format |
1975 | suitable to be read back in again, and therefore also for DWARF 2 | |
1976 | debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". | |
1977 | Caller is expected to generate the "#define" bit if needed. The | |
93c80368 | 1978 | returned text is temporary, and automatically freed later. */ |
93c80368 | 1979 | const unsigned char * |
6cf87ca4 | 1980 | cpp_macro_definition (cpp_reader *pfile, const cpp_hashnode *node) |
93c80368 NB |
1981 | { |
1982 | unsigned int i, len; | |
1983 | const cpp_macro *macro = node->value.macro; | |
1984 | unsigned char *buffer; | |
1985 | ||
1986 | if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) | |
1987 | { | |
0527bc4e | 1988 | cpp_error (pfile, CPP_DL_ICE, |
ebef4e8c | 1989 | "invalid hash type %d in cpp_macro_definition", node->type); |
93c80368 NB |
1990 | return 0; |
1991 | } | |
1992 | ||
1993 | /* Calculate length. */ | |
8dc901de | 1994 | len = NODE_LEN (node) + 2; /* ' ' and NUL. */ |
93c80368 NB |
1995 | if (macro->fun_like) |
1996 | { | |
64d08263 JB |
1997 | len += 4; /* "()" plus possible final ".." of named |
1998 | varargs (we have + 1 below). */ | |
93c80368 | 1999 | for (i = 0; i < macro->paramc; i++) |
64d08263 | 2000 | len += NODE_LEN (macro->params[i]) + 1; /* "," */ |
93c80368 NB |
2001 | } |
2002 | ||
6da55c00 | 2003 | /* This should match below where we fill in the buffer. */ |
278c4662 NB |
2004 | if (CPP_OPTION (pfile, traditional)) |
2005 | len += _cpp_replacement_text_len (macro); | |
2006 | else | |
93c80368 | 2007 | { |
aa508502 JM |
2008 | unsigned int count = macro_real_token_count (macro); |
2009 | for (i = 0; i < count; i++) | |
278c4662 NB |
2010 | { |
2011 | cpp_token *token = ¯o->exp.tokens[i]; | |
93c80368 | 2012 | |
278c4662 | 2013 | if (token->type == CPP_MACRO_ARG) |
9a0c6187 | 2014 | len += NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1]); |
278c4662 | 2015 | else |
6da55c00 EC |
2016 | len += cpp_token_len (token); |
2017 | ||
278c4662 NB |
2018 | if (token->flags & STRINGIFY_ARG) |
2019 | len++; /* "#" */ | |
2020 | if (token->flags & PASTE_LEFT) | |
2021 | len += 3; /* " ##" */ | |
6da55c00 EC |
2022 | if (token->flags & PREV_WHITE) |
2023 | len++; /* " " */ | |
278c4662 | 2024 | } |
93c80368 NB |
2025 | } |
2026 | ||
2027 | if (len > pfile->macro_buffer_len) | |
4b49c365 | 2028 | { |
c3f829c1 GDR |
2029 | pfile->macro_buffer = XRESIZEVEC (unsigned char, |
2030 | pfile->macro_buffer, len); | |
4b49c365 AO |
2031 | pfile->macro_buffer_len = len; |
2032 | } | |
7096171b NB |
2033 | |
2034 | /* Fill in the buffer. Start with the macro name. */ | |
93c80368 | 2035 | buffer = pfile->macro_buffer; |
7096171b NB |
2036 | memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); |
2037 | buffer += NODE_LEN (node); | |
93c80368 NB |
2038 | |
2039 | /* Parameter names. */ | |
2040 | if (macro->fun_like) | |
2041 | { | |
2042 | *buffer++ = '('; | |
2043 | for (i = 0; i < macro->paramc; i++) | |
2044 | { | |
2045 | cpp_hashnode *param = macro->params[i]; | |
2046 | ||
2047 | if (param != pfile->spec_nodes.n__VA_ARGS__) | |
2048 | { | |
a28c5035 NB |
2049 | memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); |
2050 | buffer += NODE_LEN (param); | |
93c80368 NB |
2051 | } |
2052 | ||
2053 | if (i + 1 < macro->paramc) | |
df383483 KH |
2054 | /* Don't emit a space after the comma here; we're trying |
2055 | to emit a Dwarf-friendly definition, and the Dwarf spec | |
2056 | forbids spaces in the argument list. */ | |
64d08263 | 2057 | *buffer++ = ','; |
28e0f040 | 2058 | else if (macro->variadic) |
93c80368 NB |
2059 | *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; |
2060 | } | |
2061 | *buffer++ = ')'; | |
2062 | } | |
2063 | ||
e37b38d7 JB |
2064 | /* The Dwarf spec requires a space after the macro name, even if the |
2065 | definition is the empty string. */ | |
2066 | *buffer++ = ' '; | |
2067 | ||
278c4662 NB |
2068 | if (CPP_OPTION (pfile, traditional)) |
2069 | buffer = _cpp_copy_replacement_text (macro, buffer); | |
2070 | else if (macro->count) | |
93c80368 | 2071 | /* Expansion tokens. */ |
93c80368 | 2072 | { |
aa508502 JM |
2073 | unsigned int count = macro_real_token_count (macro); |
2074 | for (i = 0; i < count; i++) | |
93c80368 | 2075 | { |
601328bb | 2076 | cpp_token *token = ¯o->exp.tokens[i]; |
93c80368 NB |
2077 | |
2078 | if (token->flags & PREV_WHITE) | |
2079 | *buffer++ = ' '; | |
2080 | if (token->flags & STRINGIFY_ARG) | |
2081 | *buffer++ = '#'; | |
2082 | ||
2083 | if (token->type == CPP_MACRO_ARG) | |
2084 | { | |
a28c5035 | 2085 | memcpy (buffer, |
9a0c6187 JM |
2086 | NODE_NAME (macro->params[token->val.macro_arg.arg_no - 1]), |
2087 | NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1])); | |
2088 | buffer += NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1]); | |
93c80368 NB |
2089 | } |
2090 | else | |
47e20491 | 2091 | buffer = cpp_spell_token (pfile, token, buffer, false); |
93c80368 NB |
2092 | |
2093 | if (token->flags & PASTE_LEFT) | |
2094 | { | |
2095 | *buffer++ = ' '; | |
2096 | *buffer++ = '#'; | |
2097 | *buffer++ = '#'; | |
2098 | /* Next has PREV_WHITE; see _cpp_create_definition. */ | |
2099 | } | |
2100 | } | |
2101 | } | |
2102 | ||
2103 | *buffer = '\0'; | |
2104 | return pfile->macro_buffer; | |
2105 | } |