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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, |
23345bbb | 3 | 1999, 2000, 2001, 2002, 2003 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" | |
4977bab6 ZW |
28 | #include "coretypes.h" |
29 | #include "tm.h" | |
711b8824 ZW |
30 | #include "cpplib.h" |
31 | #include "cpphash.h" | |
32 | ||
93c80368 NB |
33 | typedef struct macro_arg macro_arg; |
34 | struct macro_arg | |
35 | { | |
4ed5bcfb | 36 | const cpp_token **first; /* First token in unexpanded argument. */ |
6d2f8887 | 37 | const cpp_token **expanded; /* Macro-expanded argument. */ |
4ed5bcfb | 38 | const cpp_token *stringified; /* Stringified argument. */ |
93c80368 NB |
39 | unsigned int count; /* # of tokens in argument. */ |
40 | unsigned int expanded_count; /* # of tokens in expanded argument. */ | |
711b8824 ZW |
41 | }; |
42 | ||
93c80368 NB |
43 | /* Macro expansion. */ |
44 | ||
29b10746 | 45 | static int enter_macro_context PARAMS ((cpp_reader *, cpp_hashnode *)); |
644eddaa | 46 | static int builtin_macro PARAMS ((cpp_reader *, cpp_hashnode *)); |
4ed5bcfb | 47 | static void push_token_context |
644eddaa | 48 | PARAMS ((cpp_reader *, cpp_hashnode *, const cpp_token *, unsigned int)); |
4ed5bcfb | 49 | static void push_ptoken_context |
644eddaa | 50 | PARAMS ((cpp_reader *, cpp_hashnode *, _cpp_buff *, |
1e013d2e | 51 | const cpp_token **, unsigned int)); |
b8af0ca5 | 52 | static _cpp_buff *collect_args PARAMS ((cpp_reader *, const cpp_hashnode *)); |
93c80368 | 53 | static cpp_context *next_context PARAMS ((cpp_reader *)); |
4ed5bcfb NB |
54 | static const cpp_token *padding_token |
55 | PARAMS ((cpp_reader *, const cpp_token *)); | |
93c80368 | 56 | static void expand_arg PARAMS ((cpp_reader *, macro_arg *)); |
562a5c27 | 57 | static const cpp_token *new_string_token PARAMS ((cpp_reader *, uchar *, |
4ed5bcfb | 58 | unsigned int)); |
4ed5bcfb NB |
59 | static const cpp_token *stringify_arg PARAMS ((cpp_reader *, macro_arg *)); |
60 | static void paste_all_tokens PARAMS ((cpp_reader *, const cpp_token *)); | |
c9e7a609 NB |
61 | static bool paste_tokens PARAMS ((cpp_reader *, const cpp_token **, |
62 | const cpp_token *)); | |
e808ec9c NB |
63 | static void replace_args PARAMS ((cpp_reader *, cpp_hashnode *, cpp_macro *, |
64 | macro_arg *)); | |
d6da836d | 65 | static _cpp_buff *funlike_invocation_p PARAMS ((cpp_reader *, cpp_hashnode *)); |
cbc69f84 | 66 | static bool create_iso_definition PARAMS ((cpp_reader *, cpp_macro *)); |
93c80368 | 67 | |
93c80368 NB |
68 | /* #define directive parsing and handling. */ |
69 | ||
14baae01 | 70 | static cpp_token *alloc_expansion_token PARAMS ((cpp_reader *, cpp_macro *)); |
93c80368 | 71 | static cpp_token *lex_expansion_token PARAMS ((cpp_reader *, cpp_macro *)); |
cbc69f84 NB |
72 | static bool warn_of_redefinition PARAMS ((cpp_reader *, const cpp_hashnode *, |
73 | const cpp_macro *)); | |
23ff0223 | 74 | static bool parse_params PARAMS ((cpp_reader *, cpp_macro *)); |
e1aa5140 | 75 | static void check_trad_stringification PARAMS ((cpp_reader *, |
93c80368 | 76 | const cpp_macro *, |
e1aa5140 | 77 | const cpp_string *)); |
711b8824 | 78 | |
a69cbaac NB |
79 | /* Emits a warning if NODE is a macro defined in the main file that |
80 | has not been used. */ | |
81 | int | |
82 | _cpp_warn_if_unused_macro (pfile, node, v) | |
83 | cpp_reader *pfile; | |
84 | cpp_hashnode *node; | |
85 | void *v ATTRIBUTE_UNUSED; | |
86 | { | |
87 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) | |
88 | { | |
89 | cpp_macro *macro = node->value.macro; | |
90 | ||
91 | if (!macro->used | |
a69cbaac NB |
92 | && MAIN_FILE_P (lookup_line (&pfile->line_maps, macro->line))) |
93 | cpp_error_with_line (pfile, DL_WARNING, macro->line, 0, | |
94 | "macro \"%s\" is not used", NODE_NAME (node)); | |
95 | } | |
96 | ||
97 | return 1; | |
98 | } | |
99 | ||
4ed5bcfb NB |
100 | /* Allocates and returns a CPP_STRING token, containing TEXT of length |
101 | LEN, after null-terminating it. TEXT must be in permanent storage. */ | |
102 | static const cpp_token * | |
103 | new_string_token (pfile, text, len) | |
104 | cpp_reader *pfile; | |
105 | unsigned char *text; | |
93c80368 NB |
106 | unsigned int len; |
107 | { | |
4ed5bcfb | 108 | cpp_token *token = _cpp_temp_token (pfile); |
93c80368 | 109 | |
4ed5bcfb | 110 | text[len] = '\0'; |
93c80368 | 111 | token->type = CPP_STRING; |
4ed5bcfb NB |
112 | token->val.str.len = len; |
113 | token->val.str.text = text; | |
93c80368 | 114 | token->flags = 0; |
4ed5bcfb | 115 | return token; |
93c80368 NB |
116 | } |
117 | ||
93c80368 NB |
118 | static const char * const monthnames[] = |
119 | { | |
120 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
121 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | |
122 | }; | |
123 | ||
644eddaa NB |
124 | /* Handle builtin macros like __FILE__, and push the resulting token |
125 | on the context stack. Also handles _Pragma, for which no new token | |
d15a58c0 NB |
126 | is created. Returns 1 if it generates a new token context, 0 to |
127 | return the token to the caller. */ | |
278c4662 NB |
128 | const uchar * |
129 | _cpp_builtin_macro_text (pfile, node) | |
93c80368 | 130 | cpp_reader *pfile; |
4ed5bcfb | 131 | cpp_hashnode *node; |
93c80368 | 132 | { |
278c4662 NB |
133 | const uchar *result = NULL; |
134 | unsigned int number = 1; | |
644eddaa | 135 | |
93c80368 NB |
136 | switch (node->value.builtin) |
137 | { | |
4ed5bcfb | 138 | default: |
ebef4e8c NB |
139 | cpp_error (pfile, DL_ICE, "invalid built-in macro \"%s\"", |
140 | NODE_NAME (node)); | |
278c4662 | 141 | break; |
4ed5bcfb | 142 | |
93c80368 NB |
143 | case BT_FILE: |
144 | case BT_BASE_FILE: | |
711b8824 | 145 | { |
4ed5bcfb | 146 | unsigned int len; |
0bda4760 | 147 | const char *name; |
562a5c27 | 148 | uchar *buf; |
bb74c963 | 149 | const struct line_map *map = pfile->map; |
0bda4760 NB |
150 | |
151 | if (node->value.builtin == BT_BASE_FILE) | |
bb74c963 NB |
152 | while (! MAIN_FILE_P (map)) |
153 | map = INCLUDED_FROM (&pfile->line_maps, map); | |
0bda4760 | 154 | |
bb74c963 | 155 | name = map->to_file; |
4ed5bcfb | 156 | len = strlen (name); |
278c4662 NB |
157 | buf = _cpp_unaligned_alloc (pfile, len * 4 + 3); |
158 | result = buf; | |
159 | *buf = '"'; | |
160 | buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len); | |
161 | *buf++ = '"'; | |
162 | *buf = '\0'; | |
711b8824 | 163 | } |
644eddaa NB |
164 | break; |
165 | ||
93c80368 | 166 | case BT_INCLUDE_LEVEL: |
d8693c6f NB |
167 | /* The line map depth counts the primary source as level 1, but |
168 | historically __INCLUDE_DEPTH__ has called the primary source | |
169 | level 0. */ | |
278c4662 | 170 | number = pfile->line_maps.depth - 1; |
644eddaa | 171 | break; |
93c80368 NB |
172 | |
173 | case BT_SPECLINE: | |
174 | /* If __LINE__ is embedded in a macro, it must expand to the | |
175 | line of the macro's invocation, not its definition. | |
176 | Otherwise things like assert() will not work properly. */ | |
278c4662 NB |
177 | if (CPP_OPTION (pfile, traditional)) |
178 | number = pfile->line; | |
179 | else | |
180 | number = pfile->cur_token[-1].line; | |
181 | number = SOURCE_LINE (pfile->map, number); | |
644eddaa | 182 | break; |
93c80368 | 183 | |
5279d739 ZW |
184 | /* __STDC__ has the value 1 under normal circumstances. |
185 | However, if (a) we are in a system header, (b) the option | |
2a1dc0d8 ZW |
186 | stdc_0_in_system_headers is true (set by target config), and |
187 | (c) we are not in strictly conforming mode, then it has the | |
188 | value 0. */ | |
93c80368 NB |
189 | case BT_STDC: |
190 | { | |
5279d739 ZW |
191 | if (CPP_IN_SYSTEM_HEADER (pfile) |
192 | && CPP_OPTION (pfile, stdc_0_in_system_headers) | |
58551c23 | 193 | && !CPP_OPTION (pfile,std)) |
278c4662 | 194 | number = 0; |
5279d739 | 195 | else |
278c4662 | 196 | number = 1; |
93c80368 | 197 | } |
644eddaa | 198 | break; |
711b8824 | 199 | |
93c80368 NB |
200 | case BT_DATE: |
201 | case BT_TIME: | |
278c4662 | 202 | if (pfile->date == NULL) |
93c80368 | 203 | { |
4ed5bcfb NB |
204 | /* Allocate __DATE__ and __TIME__ strings from permanent |
205 | storage. We only do this once, and don't generate them | |
206 | at init time, because time() and localtime() are very | |
207 | slow on some systems. */ | |
56da7207 ZW |
208 | time_t tt; |
209 | struct tm *tb = NULL; | |
210 | ||
211 | /* (time_t) -1 is a legitimate value for "number of seconds | |
212 | since the Epoch", so we have to do a little dance to | |
213 | distinguish that from a genuine error. */ | |
214 | errno = 0; | |
215 | tt = time(NULL); | |
216 | if (tt != (time_t)-1 || errno == 0) | |
217 | tb = localtime (&tt); | |
218 | ||
219 | if (tb) | |
220 | { | |
221 | pfile->date = _cpp_unaligned_alloc (pfile, | |
222 | sizeof ("\"Oct 11 1347\"")); | |
223 | sprintf ((char *) pfile->date, "\"%s %2d %4d\"", | |
224 | monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); | |
225 | ||
226 | pfile->time = _cpp_unaligned_alloc (pfile, | |
227 | sizeof ("\"12:34:56\"")); | |
228 | sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", | |
229 | tb->tm_hour, tb->tm_min, tb->tm_sec); | |
230 | } | |
231 | else | |
232 | { | |
233 | cpp_errno (pfile, DL_WARNING, | |
234 | "could not determine date and time"); | |
235 | ||
236 | pfile->date = U"\"??? ?? ????\""; | |
237 | pfile->time = U"\"??:??:??\""; | |
238 | } | |
93c80368 | 239 | } |
93c80368 | 240 | |
644eddaa | 241 | if (node->value.builtin == BT_DATE) |
278c4662 | 242 | result = pfile->date; |
644eddaa | 243 | else |
278c4662 | 244 | result = pfile->time; |
644eddaa | 245 | break; |
278c4662 NB |
246 | } |
247 | ||
248 | if (result == NULL) | |
249 | { | |
250 | /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ | |
251 | result = _cpp_unaligned_alloc (pfile, 21); | |
252 | sprintf ((char *) result, "%u", number); | |
253 | } | |
254 | ||
255 | return result; | |
256 | } | |
257 | ||
258 | /* Convert builtin macros like __FILE__ to a token and push it on the | |
259 | context stack. Also handles _Pragma, for which no new token is | |
260 | created. Returns 1 if it generates a new token context, 0 to | |
261 | return the token to the caller. */ | |
262 | static int | |
263 | builtin_macro (pfile, node) | |
264 | cpp_reader *pfile; | |
265 | cpp_hashnode *node; | |
266 | { | |
267 | const uchar *buf; | |
26aea073 NB |
268 | size_t len; |
269 | char *nbuf; | |
644eddaa | 270 | |
278c4662 NB |
271 | if (node->value.builtin == BT_PRAGMA) |
272 | { | |
644eddaa NB |
273 | /* Don't interpret _Pragma within directives. The standard is |
274 | not clear on this, but to me this makes most sense. */ | |
275 | if (pfile->state.in_directive) | |
276 | return 0; | |
277 | ||
278 | _cpp_do__Pragma (pfile); | |
279 | return 1; | |
93c80368 | 280 | } |
644eddaa | 281 | |
278c4662 | 282 | buf = _cpp_builtin_macro_text (pfile, node); |
26aea073 NB |
283 | len = ustrlen (buf); |
284 | nbuf = alloca (len + 1); | |
285 | memcpy (nbuf, buf, len); | |
286 | nbuf[len]='\n'; | |
278c4662 | 287 | |
26aea073 NB |
288 | cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true, 1); |
289 | _cpp_clean_line (pfile); | |
278c4662 NB |
290 | |
291 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
292 | pfile->cur_token = _cpp_temp_token (pfile); | |
293 | push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1); | |
294 | if (pfile->buffer->cur != pfile->buffer->rlimit) | |
295 | cpp_error (pfile, DL_ICE, "invalid built-in macro \"%s\"", | |
296 | NODE_NAME (node)); | |
297 | _cpp_pop_buffer (pfile); | |
298 | ||
644eddaa | 299 | return 1; |
711b8824 ZW |
300 | } |
301 | ||
d15a58c0 NB |
302 | /* Copies SRC, of length LEN, to DEST, adding backslashes before all |
303 | backslashes and double quotes. Non-printable characters are | |
dcc229e5 ZW |
304 | converted to octal. DEST must be of sufficient size. Returns |
305 | a pointer to the end of the string. */ | |
562a5c27 | 306 | uchar * |
dcc229e5 | 307 | cpp_quote_string (dest, src, len) |
562a5c27 NB |
308 | uchar *dest; |
309 | const uchar *src; | |
93c80368 NB |
310 | unsigned int len; |
311 | { | |
312 | while (len--) | |
313 | { | |
562a5c27 | 314 | uchar c = *src++; |
711b8824 | 315 | |
93c80368 NB |
316 | if (c == '\\' || c == '"') |
317 | { | |
318 | *dest++ = '\\'; | |
319 | *dest++ = c; | |
320 | } | |
321 | else | |
322 | { | |
323 | if (ISPRINT (c)) | |
324 | *dest++ = c; | |
325 | else | |
711b8824 | 326 | { |
93c80368 NB |
327 | sprintf ((char *) dest, "\\%03o", c); |
328 | dest += 4; | |
711b8824 | 329 | } |
93c80368 NB |
330 | } |
331 | } | |
711b8824 | 332 | |
93c80368 NB |
333 | return dest; |
334 | } | |
711b8824 | 335 | |
d15a58c0 NB |
336 | /* Convert a token sequence ARG to a single string token according to |
337 | the rules of the ISO C #-operator. */ | |
4ed5bcfb | 338 | static const cpp_token * |
93c80368 NB |
339 | stringify_arg (pfile, arg) |
340 | cpp_reader *pfile; | |
341 | macro_arg *arg; | |
342 | { | |
ece54d54 NB |
343 | unsigned char *dest = BUFF_FRONT (pfile->u_buff); |
344 | unsigned int i, escape_it, backslash_count = 0; | |
4ed5bcfb | 345 | const cpp_token *source = NULL; |
ece54d54 | 346 | size_t len; |
711b8824 | 347 | |
93c80368 NB |
348 | /* Loop, reading in the argument's tokens. */ |
349 | for (i = 0; i < arg->count; i++) | |
350 | { | |
4ed5bcfb | 351 | const cpp_token *token = arg->first[i]; |
4ed5bcfb NB |
352 | |
353 | if (token->type == CPP_PADDING) | |
354 | { | |
355 | if (source == NULL) | |
356 | source = token->val.source; | |
357 | continue; | |
358 | } | |
711b8824 | 359 | |
93c80368 | 360 | escape_it = (token->type == CPP_STRING || token->type == CPP_WSTRING |
cc937581 | 361 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); |
711b8824 | 362 | |
ece54d54 NB |
363 | /* Room for each char being written in octal, initial space and |
364 | final NUL. */ | |
4ed5bcfb | 365 | len = cpp_token_len (token); |
93c80368 | 366 | if (escape_it) |
93c80368 | 367 | len *= 4; |
ece54d54 | 368 | len += 2; |
711b8824 | 369 | |
ece54d54 | 370 | if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) |
93c80368 | 371 | { |
ece54d54 | 372 | size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); |
8c3b2693 | 373 | _cpp_extend_buff (pfile, &pfile->u_buff, len); |
ece54d54 | 374 | dest = BUFF_FRONT (pfile->u_buff) + len_so_far; |
93c80368 | 375 | } |
711b8824 | 376 | |
4ed5bcfb | 377 | /* Leading white space? */ |
ece54d54 | 378 | if (dest != BUFF_FRONT (pfile->u_buff)) |
4ed5bcfb NB |
379 | { |
380 | if (source == NULL) | |
381 | source = token; | |
382 | if (source->flags & PREV_WHITE) | |
383 | *dest++ = ' '; | |
384 | } | |
385 | source = NULL; | |
711b8824 | 386 | |
93c80368 NB |
387 | if (escape_it) |
388 | { | |
ece54d54 NB |
389 | _cpp_buff *buff = _cpp_get_buff (pfile, len); |
390 | unsigned char *buf = BUFF_FRONT (buff); | |
93c80368 | 391 | len = cpp_spell_token (pfile, token, buf) - buf; |
dcc229e5 | 392 | dest = cpp_quote_string (dest, buf, len); |
ece54d54 | 393 | _cpp_release_buff (pfile, buff); |
93c80368 NB |
394 | } |
395 | else | |
396 | dest = cpp_spell_token (pfile, token, dest); | |
93c80368 | 397 | |
6c53ebff | 398 | if (token->type == CPP_OTHER && token->val.c == '\\') |
93c80368 NB |
399 | backslash_count++; |
400 | else | |
401 | backslash_count = 0; | |
402 | } | |
403 | ||
404 | /* Ignore the final \ of invalid string literals. */ | |
405 | if (backslash_count & 1) | |
406 | { | |
ebef4e8c NB |
407 | cpp_error (pfile, DL_WARNING, |
408 | "invalid string literal, ignoring final '\\'"); | |
ece54d54 | 409 | dest--; |
93c80368 NB |
410 | } |
411 | ||
4ed5bcfb | 412 | /* Commit the memory, including NUL, and return the token. */ |
57147be1 ZW |
413 | if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < 1) |
414 | { | |
415 | size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); | |
416 | _cpp_extend_buff (pfile, &pfile->u_buff, 1); | |
417 | dest = BUFF_FRONT (pfile->u_buff) + len_so_far; | |
418 | } | |
ece54d54 NB |
419 | len = dest - BUFF_FRONT (pfile->u_buff); |
420 | BUFF_FRONT (pfile->u_buff) = dest + 1; | |
421 | return new_string_token (pfile, dest - len, len); | |
93c80368 NB |
422 | } |
423 | ||
da7d8304 | 424 | /* Try to paste two tokens. On success, return nonzero. In any |
c9e7a609 NB |
425 | case, PLHS is updated to point to the pasted token, which is |
426 | guaranteed to not have the PASTE_LEFT flag set. */ | |
427 | static bool | |
428 | paste_tokens (pfile, plhs, rhs) | |
d63eefbf | 429 | cpp_reader *pfile; |
c9e7a609 | 430 | const cpp_token **plhs, *rhs; |
d63eefbf | 431 | { |
c9e7a609 NB |
432 | unsigned char *buf, *end; |
433 | const cpp_token *lhs; | |
434 | unsigned int len; | |
435 | bool valid; | |
436 | ||
437 | lhs = *plhs; | |
438 | len = cpp_token_len (lhs) + cpp_token_len (rhs) + 1; | |
439 | buf = (unsigned char *) alloca (len); | |
440 | end = cpp_spell_token (pfile, lhs, buf); | |
441 | ||
442 | /* Avoid comment headers, since they are still processed in stage 3. | |
443 | It is simpler to insert a space here, rather than modifying the | |
444 | lexer to ignore comments in some circumstances. Simply returning | |
445 | false doesn't work, since we want to clear the PASTE_LEFT flag. */ | |
5cc67323 | 446 | if (lhs->type == CPP_DIV && rhs->type != CPP_EQ) |
c9e7a609 NB |
447 | *end++ = ' '; |
448 | end = cpp_spell_token (pfile, rhs, end); | |
26aea073 | 449 | *end = '\n'; |
c9e7a609 NB |
450 | |
451 | cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true, 1); | |
26aea073 | 452 | _cpp_clean_line (pfile); |
c9e7a609 NB |
453 | |
454 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
455 | pfile->cur_token = _cpp_temp_token (pfile); | |
456 | *plhs = _cpp_lex_direct (pfile); | |
480709cc | 457 | valid = pfile->buffer->cur == pfile->buffer->rlimit; |
c9e7a609 NB |
458 | _cpp_pop_buffer (pfile); |
459 | ||
460 | return valid; | |
d63eefbf NB |
461 | } |
462 | ||
d15a58c0 NB |
463 | /* Handles an arbitrarily long sequence of ## operators, with initial |
464 | operand LHS. This implementation is left-associative, | |
465 | non-recursive, and finishes a paste before handling succeeding | |
466 | ones. If a paste fails, we back up to the RHS of the failing ## | |
467 | operator before pushing the context containing the result of prior | |
468 | successful pastes, with the effect that the RHS appears in the | |
469 | output stream after the pasted LHS normally. */ | |
93c80368 NB |
470 | static void |
471 | paste_all_tokens (pfile, lhs) | |
472 | cpp_reader *pfile; | |
4ed5bcfb | 473 | const cpp_token *lhs; |
93c80368 | 474 | { |
4ed5bcfb NB |
475 | const cpp_token *rhs; |
476 | cpp_context *context = pfile->context; | |
477 | ||
93c80368 NB |
478 | do |
479 | { | |
480 | /* Take the token directly from the current context. We can do | |
481 | this, because we are in the replacement list of either an | |
482 | object-like macro, or a function-like macro with arguments | |
483 | inserted. In either case, the constraints to #define | |
d63eefbf | 484 | guarantee we have at least one more token. */ |
4ed5bcfb | 485 | if (context->direct_p) |
82eda77e | 486 | rhs = FIRST (context).token++; |
4ed5bcfb | 487 | else |
82eda77e | 488 | rhs = *FIRST (context).ptoken++; |
4ed5bcfb NB |
489 | |
490 | if (rhs->type == CPP_PADDING) | |
491 | abort (); | |
492 | ||
c9e7a609 | 493 | if (!paste_tokens (pfile, &lhs, rhs)) |
93c80368 | 494 | { |
4ed5bcfb | 495 | _cpp_backup_tokens (pfile, 1); |
c9e7a609 | 496 | |
c3bf3e6e | 497 | /* Mandatory error for all apart from assembler. */ |
c9e7a609 | 498 | if (CPP_OPTION (pfile, lang) != CLK_ASM) |
c3bf3e6e | 499 | cpp_error (pfile, DL_ERROR, |
c9e7a609 | 500 | "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", |
ebef4e8c NB |
501 | cpp_token_as_text (pfile, lhs), |
502 | cpp_token_as_text (pfile, rhs)); | |
4c2b647d | 503 | break; |
93c80368 | 504 | } |
93c80368 NB |
505 | } |
506 | while (rhs->flags & PASTE_LEFT); | |
507 | ||
c9e7a609 NB |
508 | /* Put the resulting token in its own context. */ |
509 | push_token_context (pfile, NULL, lhs, 1); | |
93c80368 NB |
510 | } |
511 | ||
1ce676a0 NB |
512 | /* Returns TRUE if the number of arguments ARGC supplied in an |
513 | invocation of the MACRO referenced by NODE is valid. An empty | |
514 | invocation to a macro with no parameters should pass ARGC as zero. | |
515 | ||
516 | Note that MACRO cannot necessarily be deduced from NODE, in case | |
517 | NODE was redefined whilst collecting arguments. */ | |
518 | bool | |
519 | _cpp_arguments_ok (pfile, macro, node, argc) | |
520 | cpp_reader *pfile; | |
521 | cpp_macro *macro; | |
522 | const cpp_hashnode *node; | |
523 | unsigned int argc; | |
524 | { | |
525 | if (argc == macro->paramc) | |
526 | return true; | |
527 | ||
528 | if (argc < macro->paramc) | |
529 | { | |
530 | /* As an extension, a rest argument is allowed to not appear in | |
531 | the invocation at all. | |
532 | e.g. #define debug(format, args...) something | |
533 | debug("string"); | |
534 | ||
535 | This is exactly the same as if there had been an empty rest | |
536 | argument - debug("string", ). */ | |
537 | ||
538 | if (argc + 1 == macro->paramc && macro->variadic) | |
539 | { | |
540 | if (CPP_PEDANTIC (pfile) && ! macro->syshdr) | |
541 | cpp_error (pfile, DL_PEDWARN, | |
542 | "ISO C99 requires rest arguments to be used"); | |
543 | return true; | |
544 | } | |
545 | ||
546 | cpp_error (pfile, DL_ERROR, | |
547 | "macro \"%s\" requires %u arguments, but only %u given", | |
548 | NODE_NAME (node), macro->paramc, argc); | |
549 | } | |
550 | else | |
551 | cpp_error (pfile, DL_ERROR, | |
552 | "macro \"%s\" passed %u arguments, but takes just %u", | |
553 | NODE_NAME (node), argc, macro->paramc); | |
554 | ||
555 | return false; | |
556 | } | |
557 | ||
d15a58c0 NB |
558 | /* Reads and returns the arguments to a function-like macro |
559 | invocation. Assumes the opening parenthesis has been processed. | |
560 | If there is an error, emits an appropriate diagnostic and returns | |
561 | NULL. Each argument is terminated by a CPP_EOF token, for the | |
562 | future benefit of expand_arg(). */ | |
b8af0ca5 NB |
563 | static _cpp_buff * |
564 | collect_args (pfile, node) | |
93c80368 | 565 | cpp_reader *pfile; |
b8af0ca5 | 566 | const cpp_hashnode *node; |
93c80368 | 567 | { |
b8af0ca5 NB |
568 | _cpp_buff *buff, *base_buff; |
569 | cpp_macro *macro; | |
570 | macro_arg *args, *arg; | |
571 | const cpp_token *token; | |
572 | unsigned int argc; | |
b8af0ca5 NB |
573 | |
574 | macro = node->value.macro; | |
575 | if (macro->paramc) | |
576 | argc = macro->paramc; | |
577 | else | |
578 | argc = 1; | |
579 | buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) | |
580 | + sizeof (macro_arg))); | |
581 | base_buff = buff; | |
582 | args = (macro_arg *) buff->base; | |
583 | memset (args, 0, argc * sizeof (macro_arg)); | |
ece54d54 | 584 | buff->cur = (unsigned char *) &args[argc]; |
b8af0ca5 NB |
585 | arg = args, argc = 0; |
586 | ||
587 | /* Collect the tokens making up each argument. We don't yet know | |
588 | how many arguments have been supplied, whether too many or too | |
589 | few. Hence the slightly bizarre usage of "argc" and "arg". */ | |
590 | do | |
93c80368 | 591 | { |
b8af0ca5 NB |
592 | unsigned int paren_depth = 0; |
593 | unsigned int ntokens = 0; | |
93c80368 | 594 | |
b8af0ca5 NB |
595 | argc++; |
596 | arg->first = (const cpp_token **) buff->cur; | |
711b8824 | 597 | |
b8af0ca5 NB |
598 | for (;;) |
599 | { | |
600 | /* Require space for 2 new tokens (including a CPP_EOF). */ | |
ece54d54 | 601 | if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) |
b8af0ca5 | 602 | { |
8c3b2693 NB |
603 | buff = _cpp_append_extend_buff (pfile, buff, |
604 | 1000 * sizeof (cpp_token *)); | |
b8af0ca5 NB |
605 | arg->first = (const cpp_token **) buff->cur; |
606 | } | |
4ed5bcfb | 607 | |
b8af0ca5 | 608 | token = cpp_get_token (pfile); |
711b8824 | 609 | |
b8af0ca5 NB |
610 | if (token->type == CPP_PADDING) |
611 | { | |
612 | /* Drop leading padding. */ | |
613 | if (ntokens == 0) | |
614 | continue; | |
615 | } | |
616 | else if (token->type == CPP_OPEN_PAREN) | |
617 | paren_depth++; | |
618 | else if (token->type == CPP_CLOSE_PAREN) | |
619 | { | |
620 | if (paren_depth-- == 0) | |
621 | break; | |
622 | } | |
623 | else if (token->type == CPP_COMMA) | |
624 | { | |
625 | /* A comma does not terminate an argument within | |
626 | parentheses or as part of a variable argument. */ | |
627 | if (paren_depth == 0 | |
628 | && ! (macro->variadic && argc == macro->paramc)) | |
629 | break; | |
630 | } | |
631 | else if (token->type == CPP_EOF | |
632 | || (token->type == CPP_HASH && token->flags & BOL)) | |
633 | break; | |
93c80368 | 634 | |
b8af0ca5 NB |
635 | arg->first[ntokens++] = token; |
636 | } | |
93c80368 | 637 | |
b8af0ca5 NB |
638 | /* Drop trailing padding. */ |
639 | while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) | |
640 | ntokens--; | |
93c80368 | 641 | |
b8af0ca5 NB |
642 | arg->count = ntokens; |
643 | arg->first[ntokens] = &pfile->eof; | |
93c80368 | 644 | |
b8af0ca5 NB |
645 | /* Terminate the argument. Excess arguments loop back and |
646 | overwrite the final legitimate argument, before failing. */ | |
647 | if (argc <= macro->paramc) | |
648 | { | |
ece54d54 | 649 | buff->cur = (unsigned char *) &arg->first[ntokens + 1]; |
b8af0ca5 NB |
650 | if (argc != macro->paramc) |
651 | arg++; | |
652 | } | |
93c80368 | 653 | } |
e808ec9c | 654 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
93c80368 | 655 | |
e808ec9c | 656 | if (token->type == CPP_EOF) |
93c80368 | 657 | { |
ece54d54 NB |
658 | /* We still need the CPP_EOF to end directives, and to end |
659 | pre-expansion of a macro argument. Step back is not | |
660 | unconditional, since we don't want to return a CPP_EOF to our | |
661 | callers at the end of an -include-d file. */ | |
e808ec9c | 662 | if (pfile->context->prev || pfile->state.in_directive) |
b8af0ca5 | 663 | _cpp_backup_tokens (pfile, 1); |
ebef4e8c NB |
664 | cpp_error (pfile, DL_ERROR, |
665 | "unterminated argument list invoking macro \"%s\"", | |
a28c5035 | 666 | NODE_NAME (node)); |
93c80368 | 667 | } |
1ce676a0 | 668 | else |
93c80368 | 669 | { |
1ce676a0 NB |
670 | /* A single empty argument is counted as no argument. */ |
671 | if (argc == 1 && macro->paramc == 0 && args[0].count == 0) | |
672 | argc = 0; | |
673 | if (_cpp_arguments_ok (pfile, macro, node, argc)) | |
58551c23 NB |
674 | { |
675 | /* GCC has special semantics for , ## b where b is a varargs | |
676 | parameter: we remove the comma if b was omitted entirely. | |
677 | If b was merely an empty argument, the comma is retained. | |
678 | If the macro takes just one (varargs) parameter, then we | |
679 | retain the comma only if we are standards conforming. | |
680 | ||
681 | If FIRST is NULL replace_args () swallows the comma. */ | |
682 | if (macro->variadic && (argc < macro->paramc | |
683 | || (argc == 1 && args[0].count == 0 | |
684 | && !CPP_OPTION (pfile, std)))) | |
685 | args[macro->paramc - 1].first = NULL; | |
686 | return base_buff; | |
687 | } | |
93c80368 NB |
688 | } |
689 | ||
1ce676a0 | 690 | /* An error occurred. */ |
b8af0ca5 NB |
691 | _cpp_release_buff (pfile, base_buff); |
692 | return NULL; | |
93c80368 NB |
693 | } |
694 | ||
d6da836d NB |
695 | /* Search for an opening parenthesis to the macro of NODE, in such a |
696 | way that, if none is found, we don't lose the information in any | |
697 | intervening padding tokens. If we find the parenthesis, collect | |
698 | the arguments and return the buffer containing them. */ | |
699 | static _cpp_buff * | |
4ed5bcfb | 700 | funlike_invocation_p (pfile, node) |
93c80368 | 701 | cpp_reader *pfile; |
644eddaa | 702 | cpp_hashnode *node; |
93c80368 | 703 | { |
d6da836d | 704 | const cpp_token *token, *padding = NULL; |
4ed5bcfb | 705 | |
d6da836d | 706 | for (;;) |
bdcbe496 | 707 | { |
d6da836d NB |
708 | token = cpp_get_token (pfile); |
709 | if (token->type != CPP_PADDING) | |
710 | break; | |
711 | if (padding == NULL | |
712 | || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) | |
713 | padding = token; | |
bdcbe496 | 714 | } |
93c80368 | 715 | |
d6da836d | 716 | if (token->type == CPP_OPEN_PAREN) |
93c80368 | 717 | { |
d6da836d NB |
718 | pfile->state.parsing_args = 2; |
719 | return collect_args (pfile, node); | |
93c80368 NB |
720 | } |
721 | ||
9ac3b1be NB |
722 | /* CPP_EOF can be the end of macro arguments, or the end of the |
723 | file. We mustn't back up over the latter. Ugh. */ | |
724 | if (token->type != CPP_EOF || token == &pfile->eof) | |
725 | { | |
726 | /* Back up. We may have skipped padding, in which case backing | |
727 | up more than one token when expanding macros is in general | |
728 | too difficult. We re-insert it in its own context. */ | |
729 | _cpp_backup_tokens (pfile, 1); | |
730 | if (padding) | |
731 | push_token_context (pfile, NULL, padding, 1); | |
732 | } | |
d6da836d NB |
733 | |
734 | return NULL; | |
93c80368 NB |
735 | } |
736 | ||
d15a58c0 NB |
737 | /* Push the context of a macro with hash entry NODE onto the context |
738 | stack. If we can successfully expand the macro, we push a context | |
739 | containing its yet-to-be-rescanned replacement list and return one. | |
740 | Otherwise, we don't push a context and return zero. */ | |
711b8824 | 741 | static int |
29b10746 | 742 | enter_macro_context (pfile, node) |
711b8824 | 743 | cpp_reader *pfile; |
29b10746 | 744 | cpp_hashnode *node; |
711b8824 | 745 | { |
d15a58c0 | 746 | /* The presence of a macro invalidates a file's controlling macro. */ |
644eddaa NB |
747 | pfile->mi_valid = false; |
748 | ||
3620711b NB |
749 | pfile->state.angled_headers = false; |
750 | ||
d15a58c0 | 751 | /* Handle standard macros. */ |
644eddaa | 752 | if (! (node->flags & NODE_BUILTIN)) |
711b8824 | 753 | { |
4ed5bcfb | 754 | cpp_macro *macro = node->value.macro; |
4c2b647d | 755 | |
d6da836d NB |
756 | if (macro->fun_like) |
757 | { | |
758 | _cpp_buff *buff; | |
759 | ||
760 | pfile->state.prevent_expansion++; | |
761 | pfile->keep_tokens++; | |
762 | pfile->state.parsing_args = 1; | |
763 | buff = funlike_invocation_p (pfile, node); | |
764 | pfile->state.parsing_args = 0; | |
765 | pfile->keep_tokens--; | |
766 | pfile->state.prevent_expansion--; | |
767 | ||
768 | if (buff == NULL) | |
769 | { | |
770 | if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr) | |
ebef4e8c | 771 | cpp_error (pfile, DL_WARNING, |
d6da836d | 772 | "function-like macro \"%s\" must be used with arguments in traditional C", |
ebef4e8c | 773 | NODE_NAME (node)); |
d6da836d NB |
774 | |
775 | return 0; | |
776 | } | |
777 | ||
e808ec9c NB |
778 | if (macro->paramc > 0) |
779 | replace_args (pfile, node, macro, (macro_arg *) buff->base); | |
d6da836d NB |
780 | _cpp_release_buff (pfile, buff); |
781 | } | |
93c80368 | 782 | |
4ed5bcfb | 783 | /* Disable the macro within its expansion. */ |
644eddaa | 784 | node->flags |= NODE_DISABLED; |
93c80368 | 785 | |
a69cbaac NB |
786 | macro->used = 1; |
787 | ||
4ed5bcfb | 788 | if (macro->paramc == 0) |
601328bb | 789 | push_token_context (pfile, node, macro->exp.tokens, macro->count); |
644eddaa NB |
790 | |
791 | return 1; | |
711b8824 | 792 | } |
644eddaa | 793 | |
d15a58c0 | 794 | /* Handle built-in macros and the _Pragma operator. */ |
644eddaa | 795 | return builtin_macro (pfile, node); |
93c80368 NB |
796 | } |
797 | ||
d15a58c0 NB |
798 | /* Replace the parameters in a function-like macro of NODE with the |
799 | actual ARGS, and place the result in a newly pushed token context. | |
800 | Expand each argument before replacing, unless it is operated upon | |
801 | by the # or ## operators. */ | |
93c80368 | 802 | static void |
e808ec9c | 803 | replace_args (pfile, node, macro, args) |
93c80368 | 804 | cpp_reader *pfile; |
644eddaa | 805 | cpp_hashnode *node; |
e808ec9c | 806 | cpp_macro *macro; |
93c80368 | 807 | macro_arg *args; |
93c80368 NB |
808 | { |
809 | unsigned int i, total; | |
810 | const cpp_token *src, *limit; | |
4ed5bcfb | 811 | const cpp_token **dest, **first; |
93c80368 | 812 | macro_arg *arg; |
1e013d2e | 813 | _cpp_buff *buff; |
93c80368 | 814 | |
93c80368 | 815 | /* First, fully macro-expand arguments, calculating the number of |
1e013d2e NB |
816 | tokens in the final expansion as we go. The ordering of the if |
817 | statements below is subtle; we must handle stringification before | |
818 | pasting. */ | |
4ed5bcfb | 819 | total = macro->count; |
601328bb | 820 | limit = macro->exp.tokens + macro->count; |
4ed5bcfb | 821 | |
601328bb | 822 | for (src = macro->exp.tokens; src < limit; src++) |
93c80368 NB |
823 | if (src->type == CPP_MACRO_ARG) |
824 | { | |
4ed5bcfb NB |
825 | /* Leading and trailing padding tokens. */ |
826 | total += 2; | |
827 | ||
93c80368 NB |
828 | /* We have an argument. If it is not being stringified or |
829 | pasted it is macro-replaced before insertion. */ | |
6c53ebff | 830 | arg = &args[src->val.arg_no - 1]; |
4c2b647d | 831 | |
93c80368 NB |
832 | if (src->flags & STRINGIFY_ARG) |
833 | { | |
834 | if (!arg->stringified) | |
4ed5bcfb | 835 | arg->stringified = stringify_arg (pfile, arg); |
93c80368 NB |
836 | } |
837 | else if ((src->flags & PASTE_LEFT) | |
601328bb | 838 | || (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT))) |
93c80368 NB |
839 | total += arg->count - 1; |
840 | else | |
841 | { | |
842 | if (!arg->expanded) | |
4ed5bcfb | 843 | expand_arg (pfile, arg); |
93c80368 NB |
844 | total += arg->expanded_count - 1; |
845 | } | |
846 | } | |
847 | ||
4ed5bcfb NB |
848 | /* Now allocate space for the expansion, copy the tokens and replace |
849 | the arguments. */ | |
1e013d2e NB |
850 | buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); |
851 | first = (const cpp_token **) buff->base; | |
4ed5bcfb | 852 | dest = first; |
93c80368 | 853 | |
601328bb | 854 | for (src = macro->exp.tokens; src < limit; src++) |
4ed5bcfb NB |
855 | { |
856 | unsigned int count; | |
857 | const cpp_token **from, **paste_flag; | |
93c80368 | 858 | |
4ed5bcfb NB |
859 | if (src->type != CPP_MACRO_ARG) |
860 | { | |
861 | *dest++ = src; | |
862 | continue; | |
863 | } | |
93c80368 | 864 | |
4ed5bcfb NB |
865 | paste_flag = 0; |
866 | arg = &args[src->val.arg_no - 1]; | |
867 | if (src->flags & STRINGIFY_ARG) | |
868 | count = 1, from = &arg->stringified; | |
869 | else if (src->flags & PASTE_LEFT) | |
870 | count = arg->count, from = arg->first; | |
601328bb | 871 | else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)) |
4ed5bcfb NB |
872 | { |
873 | count = arg->count, from = arg->first; | |
874 | if (dest != first) | |
875 | { | |
4ed5bcfb NB |
876 | if (dest[-1]->type == CPP_COMMA |
877 | && macro->variadic | |
878 | && src->val.arg_no == macro->paramc) | |
879 | { | |
58551c23 NB |
880 | /* Swallow a pasted comma if from == NULL, otherwise |
881 | drop the paste flag. */ | |
882 | if (from == NULL) | |
4ed5bcfb NB |
883 | dest--; |
884 | else | |
885 | paste_flag = dest - 1; | |
886 | } | |
887 | /* Remove the paste flag if the RHS is a placemarker. */ | |
888 | else if (count == 0) | |
889 | paste_flag = dest - 1; | |
890 | } | |
891 | } | |
892 | else | |
893 | count = arg->expanded_count, from = arg->expanded; | |
4c2b647d | 894 | |
4ed5bcfb | 895 | /* Padding on the left of an argument (unless RHS of ##). */ |
a8d0ddaf | 896 | if ((!pfile->state.in_directive || pfile->state.directive_wants_padding) |
601328bb | 897 | && src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT)) |
4ed5bcfb | 898 | *dest++ = padding_token (pfile, src); |
93c80368 | 899 | |
4ed5bcfb NB |
900 | if (count) |
901 | { | |
902 | memcpy (dest, from, count * sizeof (cpp_token *)); | |
903 | dest += count; | |
93c80368 | 904 | |
4ed5bcfb NB |
905 | /* With a non-empty argument on the LHS of ##, the last |
906 | token should be flagged PASTE_LEFT. */ | |
907 | if (src->flags & PASTE_LEFT) | |
908 | paste_flag = dest - 1; | |
909 | } | |
26ec42ee | 910 | |
4ed5bcfb NB |
911 | /* Avoid paste on RHS (even case count == 0). */ |
912 | if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) | |
913 | *dest++ = &pfile->avoid_paste; | |
93c80368 | 914 | |
4ed5bcfb NB |
915 | /* Add a new paste flag, or remove an unwanted one. */ |
916 | if (paste_flag) | |
917 | { | |
918 | cpp_token *token = _cpp_temp_token (pfile); | |
919 | token->type = (*paste_flag)->type; | |
920 | token->val.str = (*paste_flag)->val.str; | |
921 | if (src->flags & PASTE_LEFT) | |
922 | token->flags = (*paste_flag)->flags | PASTE_LEFT; | |
923 | else | |
924 | token->flags = (*paste_flag)->flags & ~PASTE_LEFT; | |
925 | *paste_flag = token; | |
926 | } | |
927 | } | |
4c2b647d | 928 | |
93c80368 NB |
929 | /* Free the expanded arguments. */ |
930 | for (i = 0; i < macro->paramc; i++) | |
4ed5bcfb NB |
931 | if (args[i].expanded) |
932 | free (args[i].expanded); | |
933 | ||
644eddaa | 934 | push_ptoken_context (pfile, node, buff, first, dest - first); |
4ed5bcfb NB |
935 | } |
936 | ||
937 | /* Return a special padding token, with padding inherited from SOURCE. */ | |
938 | static const cpp_token * | |
939 | padding_token (pfile, source) | |
940 | cpp_reader *pfile; | |
941 | const cpp_token *source; | |
942 | { | |
943 | cpp_token *result = _cpp_temp_token (pfile); | |
944 | ||
945 | result->type = CPP_PADDING; | |
946 | result->val.source = source; | |
947 | result->flags = 0; | |
948 | return result; | |
949 | } | |
950 | ||
d15a58c0 NB |
951 | /* Get a new uninitialized context. Create a new one if we cannot |
952 | re-use an old one. */ | |
4ed5bcfb NB |
953 | static cpp_context * |
954 | next_context (pfile) | |
955 | cpp_reader *pfile; | |
956 | { | |
957 | cpp_context *result = pfile->context->next; | |
958 | ||
959 | if (result == 0) | |
711b8824 | 960 | { |
4ed5bcfb NB |
961 | result = xnew (cpp_context); |
962 | result->prev = pfile->context; | |
963 | result->next = 0; | |
964 | pfile->context->next = result; | |
93c80368 | 965 | } |
4ed5bcfb NB |
966 | |
967 | pfile->context = result; | |
968 | return result; | |
93c80368 NB |
969 | } |
970 | ||
4ed5bcfb NB |
971 | /* Push a list of pointers to tokens. */ |
972 | static void | |
1e013d2e | 973 | push_ptoken_context (pfile, macro, buff, first, count) |
93c80368 | 974 | cpp_reader *pfile; |
644eddaa | 975 | cpp_hashnode *macro; |
1e013d2e | 976 | _cpp_buff *buff; |
4ed5bcfb NB |
977 | const cpp_token **first; |
978 | unsigned int count; | |
93c80368 NB |
979 | { |
980 | cpp_context *context = next_context (pfile); | |
93c80368 | 981 | |
4ed5bcfb NB |
982 | context->direct_p = false; |
983 | context->macro = macro; | |
1e013d2e | 984 | context->buff = buff; |
82eda77e NB |
985 | FIRST (context).ptoken = first; |
986 | LAST (context).ptoken = first + count; | |
4ed5bcfb NB |
987 | } |
988 | ||
989 | /* Push a list of tokens. */ | |
990 | static void | |
991 | push_token_context (pfile, macro, first, count) | |
992 | cpp_reader *pfile; | |
644eddaa | 993 | cpp_hashnode *macro; |
4ed5bcfb NB |
994 | const cpp_token *first; |
995 | unsigned int count; | |
996 | { | |
997 | cpp_context *context = next_context (pfile); | |
998 | ||
999 | context->direct_p = true; | |
1000 | context->macro = macro; | |
1e013d2e | 1001 | context->buff = NULL; |
82eda77e NB |
1002 | FIRST (context).token = first; |
1003 | LAST (context).token = first + count; | |
93c80368 NB |
1004 | } |
1005 | ||
cbc69f84 NB |
1006 | /* Push a traditional macro's replacement text. */ |
1007 | void | |
1ce676a0 | 1008 | _cpp_push_text_context (pfile, macro, start, len) |
cbc69f84 NB |
1009 | cpp_reader *pfile; |
1010 | cpp_hashnode *macro; | |
1ce676a0 NB |
1011 | const uchar *start; |
1012 | size_t len; | |
cbc69f84 NB |
1013 | { |
1014 | cpp_context *context = next_context (pfile); | |
1015 | ||
1016 | context->direct_p = true; | |
1017 | context->macro = macro; | |
1018 | context->buff = NULL; | |
1019 | CUR (context) = start; | |
1ce676a0 | 1020 | RLIMIT (context) = start + len; |
974c43f1 | 1021 | macro->flags |= NODE_DISABLED; |
cbc69f84 NB |
1022 | } |
1023 | ||
d15a58c0 NB |
1024 | /* Expand an argument ARG before replacing parameters in a |
1025 | function-like macro. This works by pushing a context with the | |
1026 | argument's tokens, and then expanding that into a temporary buffer | |
1027 | as if it were a normal part of the token stream. collect_args() | |
1028 | has terminated the argument's tokens with a CPP_EOF so that we know | |
1029 | when we have fully expanded the argument. */ | |
93c80368 NB |
1030 | static void |
1031 | expand_arg (pfile, arg) | |
1032 | cpp_reader *pfile; | |
1033 | macro_arg *arg; | |
1034 | { | |
4ed5bcfb | 1035 | unsigned int capacity; |
56941bf2 | 1036 | bool saved_warn_trad; |
4ed5bcfb | 1037 | |
4ed5bcfb NB |
1038 | if (arg->count == 0) |
1039 | return; | |
93c80368 | 1040 | |
56941bf2 NB |
1041 | /* Don't warn about funlike macros when pre-expanding. */ |
1042 | saved_warn_trad = CPP_WTRADITIONAL (pfile); | |
1043 | CPP_WTRADITIONAL (pfile) = 0; | |
1044 | ||
93c80368 | 1045 | /* Loop, reading in the arguments. */ |
4ed5bcfb NB |
1046 | capacity = 256; |
1047 | arg->expanded = (const cpp_token **) | |
1048 | xmalloc (capacity * sizeof (cpp_token *)); | |
93c80368 | 1049 | |
1e013d2e | 1050 | push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); |
4ed5bcfb | 1051 | for (;;) |
93c80368 | 1052 | { |
4ed5bcfb NB |
1053 | const cpp_token *token; |
1054 | ||
1055 | if (arg->expanded_count + 1 >= capacity) | |
711b8824 | 1056 | { |
93c80368 | 1057 | capacity *= 2; |
4ed5bcfb NB |
1058 | arg->expanded = (const cpp_token **) |
1059 | xrealloc (arg->expanded, capacity * sizeof (cpp_token *)); | |
93c80368 | 1060 | } |
93c80368 | 1061 | |
4ed5bcfb | 1062 | token = cpp_get_token (pfile); |
93c80368 | 1063 | |
4ed5bcfb NB |
1064 | if (token->type == CPP_EOF) |
1065 | break; | |
1066 | ||
1067 | arg->expanded[arg->expanded_count++] = token; | |
1068 | } | |
1069 | ||
1e013d2e | 1070 | _cpp_pop_context (pfile); |
56941bf2 NB |
1071 | |
1072 | CPP_WTRADITIONAL (pfile) = saved_warn_trad; | |
93c80368 NB |
1073 | } |
1074 | ||
d15a58c0 NB |
1075 | /* Pop the current context off the stack, re-enabling the macro if the |
1076 | context represented a macro's replacement list. The context | |
1077 | structure is not freed so that we can re-use it later. */ | |
93c80368 NB |
1078 | void |
1079 | _cpp_pop_context (pfile) | |
1080 | cpp_reader *pfile; | |
1081 | { | |
1e013d2e NB |
1082 | cpp_context *context = pfile->context; |
1083 | ||
1e013d2e | 1084 | if (context->macro) |
644eddaa | 1085 | context->macro->flags &= ~NODE_DISABLED; |
1e013d2e NB |
1086 | |
1087 | if (context->buff) | |
1088 | _cpp_release_buff (pfile, context->buff); | |
93c80368 | 1089 | |
1e013d2e | 1090 | pfile->context = context->prev; |
93c80368 NB |
1091 | } |
1092 | ||
7f2f1a66 NB |
1093 | /* Eternal routine to get a token. Also used nearly everywhere |
1094 | internally, except for places where we know we can safely call | |
1095 | the lexer directly, such as lexing a directive name. | |
1096 | ||
1097 | Macro expansions and directives are transparently handled, | |
1098 | including entering included files. Thus tokens are post-macro | |
1099 | expansion, and after any intervening directives. External callers | |
1100 | see CPP_EOF only at EOF. Internal callers also see it when meeting | |
1101 | a directive inside a macro call, when at the end of a directive and | |
1102 | state.in_directive is still 1, and at the end of argument | |
1103 | pre-expansion. */ | |
4ed5bcfb NB |
1104 | const cpp_token * |
1105 | cpp_get_token (pfile) | |
93c80368 | 1106 | cpp_reader *pfile; |
93c80368 | 1107 | { |
4ed5bcfb NB |
1108 | const cpp_token *result; |
1109 | ||
29b10746 | 1110 | for (;;) |
93c80368 | 1111 | { |
4ed5bcfb | 1112 | cpp_hashnode *node; |
93c80368 NB |
1113 | cpp_context *context = pfile->context; |
1114 | ||
93c80368 | 1115 | /* Context->prev == 0 <=> base context. */ |
bdcbe496 | 1116 | if (!context->prev) |
4ed5bcfb | 1117 | result = _cpp_lex_token (pfile); |
82eda77e | 1118 | else if (FIRST (context).token != LAST (context).token) |
29b10746 | 1119 | { |
4ed5bcfb | 1120 | if (context->direct_p) |
82eda77e | 1121 | result = FIRST (context).token++; |
4ed5bcfb | 1122 | else |
82eda77e | 1123 | result = *FIRST (context).ptoken++; |
4ed5bcfb NB |
1124 | |
1125 | if (result->flags & PASTE_LEFT) | |
ec1a23e6 | 1126 | { |
4ed5bcfb NB |
1127 | paste_all_tokens (pfile, result); |
1128 | if (pfile->state.in_directive) | |
1129 | continue; | |
1130 | return padding_token (pfile, result); | |
ec1a23e6 | 1131 | } |
29b10746 | 1132 | } |
93c80368 NB |
1133 | else |
1134 | { | |
bdcbe496 | 1135 | _cpp_pop_context (pfile); |
4ed5bcfb NB |
1136 | if (pfile->state.in_directive) |
1137 | continue; | |
1138 | return &pfile->avoid_paste; | |
93c80368 | 1139 | } |
93c80368 | 1140 | |
477cdac7 JT |
1141 | if (pfile->state.in_directive && result->type == CPP_COMMENT) |
1142 | continue; | |
1143 | ||
4ed5bcfb | 1144 | if (result->type != CPP_NAME) |
93c80368 NB |
1145 | break; |
1146 | ||
4ed5bcfb NB |
1147 | node = result->val.node; |
1148 | ||
644eddaa NB |
1149 | if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) |
1150 | break; | |
df383483 | 1151 | |
644eddaa | 1152 | if (!(node->flags & NODE_DISABLED)) |
93c80368 | 1153 | { |
644eddaa NB |
1154 | if (!pfile->state.prevent_expansion |
1155 | && enter_macro_context (pfile, node)) | |
bd969772 | 1156 | { |
4ed5bcfb NB |
1157 | if (pfile->state.in_directive) |
1158 | continue; | |
1159 | return padding_token (pfile, result); | |
bd969772 | 1160 | } |
93c80368 | 1161 | } |
644eddaa NB |
1162 | else |
1163 | { | |
d15a58c0 NB |
1164 | /* Flag this token as always unexpandable. FIXME: move this |
1165 | to collect_args()?. */ | |
644eddaa NB |
1166 | cpp_token *t = _cpp_temp_token (pfile); |
1167 | t->type = result->type; | |
1168 | t->flags = result->flags | NO_EXPAND; | |
1169 | t->val.str = result->val.str; | |
1170 | result = t; | |
1171 | } | |
a5c3cccd | 1172 | |
644eddaa | 1173 | break; |
93c80368 | 1174 | } |
4ed5bcfb NB |
1175 | |
1176 | return result; | |
93c80368 NB |
1177 | } |
1178 | ||
7065e130 NB |
1179 | /* Returns true if we're expanding an object-like macro that was |
1180 | defined in a system header. Just checks the macro at the top of | |
1181 | the stack. Used for diagnostic suppression. */ | |
1182 | int | |
c691145a | 1183 | cpp_sys_macro_p (pfile) |
7065e130 NB |
1184 | cpp_reader *pfile; |
1185 | { | |
644eddaa | 1186 | cpp_hashnode *node = pfile->context->macro; |
7065e130 | 1187 | |
644eddaa | 1188 | return node && node->value.macro && node->value.macro->syshdr; |
7065e130 NB |
1189 | } |
1190 | ||
af0d16cd NB |
1191 | /* Read each token in, until end of the current file. Directives are |
1192 | transparently processed. */ | |
93c80368 | 1193 | void |
ef6e958a | 1194 | cpp_scan_nooutput (pfile) |
93c80368 NB |
1195 | cpp_reader *pfile; |
1196 | { | |
af0d16cd NB |
1197 | /* Request a CPP_EOF token at the end of this file, rather than |
1198 | transparently continuing with the including file. */ | |
1199 | pfile->buffer->return_at_eof = true; | |
1200 | ||
590e1987 NB |
1201 | if (CPP_OPTION (pfile, traditional)) |
1202 | while (_cpp_read_logical_line_trad (pfile)) | |
1203 | ; | |
1204 | else | |
1205 | while (cpp_get_token (pfile)->type != CPP_EOF) | |
1206 | ; | |
93c80368 NB |
1207 | } |
1208 | ||
bdcbe496 NB |
1209 | /* Step back one (or more) tokens. Can only step mack more than 1 if |
1210 | they are from the lexer, and not from macro expansion. */ | |
b528a07e | 1211 | void |
bdcbe496 | 1212 | _cpp_backup_tokens (pfile, count) |
93c80368 | 1213 | cpp_reader *pfile; |
bdcbe496 | 1214 | unsigned int count; |
93c80368 | 1215 | { |
bdcbe496 | 1216 | if (pfile->context->prev == NULL) |
93c80368 | 1217 | { |
bdcbe496 NB |
1218 | pfile->lookaheads += count; |
1219 | while (count--) | |
1220 | { | |
3293c3e3 NB |
1221 | pfile->cur_token--; |
1222 | if (pfile->cur_token == pfile->cur_run->base | |
1223 | /* Possible with -fpreprocessed and no leading #line. */ | |
1224 | && pfile->cur_run->prev != NULL) | |
bdcbe496 | 1225 | { |
bdcbe496 NB |
1226 | pfile->cur_run = pfile->cur_run->prev; |
1227 | pfile->cur_token = pfile->cur_run->limit; | |
1228 | } | |
1229 | } | |
93c80368 | 1230 | } |
bdcbe496 | 1231 | else |
93c80368 | 1232 | { |
bdcbe496 NB |
1233 | if (count != 1) |
1234 | abort (); | |
4ed5bcfb | 1235 | if (pfile->context->direct_p) |
82eda77e | 1236 | FIRST (pfile->context).token--; |
4ed5bcfb | 1237 | else |
82eda77e | 1238 | FIRST (pfile->context).ptoken--; |
93c80368 NB |
1239 | } |
1240 | } | |
711b8824 | 1241 | |
93c80368 NB |
1242 | /* #define directive parsing and handling. */ |
1243 | ||
da7d8304 | 1244 | /* Returns nonzero if a macro redefinition warning is required. */ |
cbc69f84 NB |
1245 | static bool |
1246 | warn_of_redefinition (pfile, node, macro2) | |
1247 | cpp_reader *pfile; | |
93c80368 NB |
1248 | const cpp_hashnode *node; |
1249 | const cpp_macro *macro2; | |
1250 | { | |
1251 | const cpp_macro *macro1; | |
1252 | unsigned int i; | |
1253 | ||
618cdda7 NB |
1254 | /* Some redefinitions need to be warned about regardless. */ |
1255 | if (node->flags & NODE_WARN) | |
cbc69f84 | 1256 | return true; |
93c80368 | 1257 | |
618cdda7 | 1258 | /* Redefinition of a macro is allowed if and only if the old and new |
ec5c56db | 1259 | definitions are the same. (6.10.3 paragraph 2). */ |
93c80368 NB |
1260 | macro1 = node->value.macro; |
1261 | ||
6618c5d4 NB |
1262 | /* Don't check count here as it can be different in valid |
1263 | traditional redefinitions with just whitespace differences. */ | |
1264 | if (macro1->paramc != macro2->paramc | |
93c80368 | 1265 | || macro1->fun_like != macro2->fun_like |
28e0f040 | 1266 | || macro1->variadic != macro2->variadic) |
cbc69f84 | 1267 | return true; |
93c80368 NB |
1268 | |
1269 | /* Check parameter spellings. */ | |
1270 | for (i = 0; i < macro1->paramc; i++) | |
1271 | if (macro1->params[i] != macro2->params[i]) | |
cbc69f84 | 1272 | return true; |
93c80368 | 1273 | |
cbc69f84 NB |
1274 | /* Check the replacement text or tokens. */ |
1275 | if (CPP_OPTION (pfile, traditional)) | |
6618c5d4 | 1276 | return _cpp_expansions_different_trad (macro1, macro2); |
cbc69f84 | 1277 | |
6618c5d4 NB |
1278 | if (macro1->count == macro2->count) |
1279 | for (i = 0; i < macro1->count; i++) | |
1280 | if (!_cpp_equiv_tokens (¯o1->exp.tokens[i], ¯o2->exp.tokens[i])) | |
1281 | return true; | |
cbc69f84 NB |
1282 | |
1283 | return false; | |
93c80368 NB |
1284 | } |
1285 | ||
1286 | /* Free the definition of hashnode H. */ | |
711b8824 ZW |
1287 | void |
1288 | _cpp_free_definition (h) | |
1289 | cpp_hashnode *h; | |
1290 | { | |
93c80368 NB |
1291 | /* Macros and assertions no longer have anything to free. */ |
1292 | h->type = NT_VOID; | |
1293 | /* Clear builtin flag in case of redefinition. */ | |
644eddaa | 1294 | h->flags &= ~(NODE_BUILTIN | NODE_DISABLED); |
93c80368 NB |
1295 | } |
1296 | ||
14baae01 | 1297 | /* Save parameter NODE to the parameter list of macro MACRO. Returns |
da7d8304 | 1298 | zero on success, nonzero if the parameter is a duplicate. */ |
c70f6ed3 NB |
1299 | bool |
1300 | _cpp_save_parameter (pfile, macro, node) | |
93c80368 NB |
1301 | cpp_reader *pfile; |
1302 | cpp_macro *macro; | |
1303 | cpp_hashnode *node; | |
1304 | { | |
4977bab6 | 1305 | unsigned int len; |
93c80368 | 1306 | /* Constraint 6.10.3.6 - duplicate parameter names. */ |
4977bab6 | 1307 | if (node->flags & NODE_MACRO_ARG) |
709e9e50 | 1308 | { |
ebef4e8c NB |
1309 | cpp_error (pfile, DL_ERROR, "duplicate macro parameter \"%s\"", |
1310 | NODE_NAME (node)); | |
23ff0223 | 1311 | return true; |
93c80368 | 1312 | } |
709e9e50 | 1313 | |
8c3b2693 NB |
1314 | if (BUFF_ROOM (pfile->a_buff) |
1315 | < (macro->paramc + 1) * sizeof (cpp_hashnode *)) | |
1316 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); | |
709e9e50 | 1317 | |
8c3b2693 | 1318 | ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; |
4977bab6 ZW |
1319 | node->flags |= NODE_MACRO_ARG; |
1320 | len = macro->paramc * sizeof (union _cpp_hashnode_value); | |
1321 | if (len > pfile->macro_buffer_len) | |
1322 | { | |
1323 | pfile->macro_buffer = (uchar *) xrealloc (pfile->macro_buffer, len); | |
1324 | pfile->macro_buffer_len = len; | |
1325 | } | |
1326 | ((union _cpp_hashnode_value *) pfile->macro_buffer)[macro->paramc - 1] | |
1327 | = node->value; | |
1328 | ||
1329 | node->value.arg_index = macro->paramc; | |
23ff0223 | 1330 | return false; |
711b8824 ZW |
1331 | } |
1332 | ||
23ff0223 NB |
1333 | /* Check the syntax of the parameters in a MACRO definition. Returns |
1334 | false if an error occurs. */ | |
1335 | static bool | |
93c80368 | 1336 | parse_params (pfile, macro) |
711b8824 | 1337 | cpp_reader *pfile; |
93c80368 | 1338 | cpp_macro *macro; |
711b8824 | 1339 | { |
93c80368 | 1340 | unsigned int prev_ident = 0; |
711b8824 | 1341 | |
93c80368 | 1342 | for (;;) |
711b8824 | 1343 | { |
345894b4 | 1344 | const cpp_token *token = _cpp_lex_token (pfile); |
711b8824 | 1345 | |
345894b4 | 1346 | switch (token->type) |
711b8824 | 1347 | { |
93c80368 | 1348 | default: |
477cdac7 JT |
1349 | /* Allow/ignore comments in parameter lists if we are |
1350 | preserving comments in macro expansions. */ | |
1351 | if (token->type == CPP_COMMENT | |
1352 | && ! CPP_OPTION (pfile, discard_comments_in_macro_exp)) | |
1353 | continue; | |
1354 | ||
ebef4e8c NB |
1355 | cpp_error (pfile, DL_ERROR, |
1356 | "\"%s\" may not appear in macro parameter list", | |
345894b4 | 1357 | cpp_token_as_text (pfile, token)); |
23ff0223 | 1358 | return false; |
93c80368 | 1359 | |
711b8824 | 1360 | case CPP_NAME: |
93c80368 NB |
1361 | if (prev_ident) |
1362 | { | |
ebef4e8c NB |
1363 | cpp_error (pfile, DL_ERROR, |
1364 | "macro parameters must be comma-separated"); | |
23ff0223 | 1365 | return false; |
93c80368 NB |
1366 | } |
1367 | prev_ident = 1; | |
1368 | ||
c70f6ed3 | 1369 | if (_cpp_save_parameter (pfile, macro, token->val.node)) |
23ff0223 | 1370 | return false; |
93c80368 | 1371 | continue; |
711b8824 | 1372 | |
93c80368 NB |
1373 | case CPP_CLOSE_PAREN: |
1374 | if (prev_ident || macro->paramc == 0) | |
23ff0223 | 1375 | return true; |
711b8824 | 1376 | |
93c80368 NB |
1377 | /* Fall through to pick up the error. */ |
1378 | case CPP_COMMA: | |
1379 | if (!prev_ident) | |
1380 | { | |
ebef4e8c | 1381 | cpp_error (pfile, DL_ERROR, "parameter name missing"); |
23ff0223 | 1382 | return false; |
93c80368 NB |
1383 | } |
1384 | prev_ident = 0; | |
711b8824 ZW |
1385 | continue; |
1386 | ||
93c80368 | 1387 | case CPP_ELLIPSIS: |
28e0f040 | 1388 | macro->variadic = 1; |
93c80368 NB |
1389 | if (!prev_ident) |
1390 | { | |
c70f6ed3 NB |
1391 | _cpp_save_parameter (pfile, macro, |
1392 | pfile->spec_nodes.n__VA_ARGS__); | |
93c80368 NB |
1393 | pfile->state.va_args_ok = 1; |
1394 | if (! CPP_OPTION (pfile, c99) && CPP_OPTION (pfile, pedantic)) | |
ebef4e8c NB |
1395 | cpp_error (pfile, DL_PEDWARN, |
1396 | "anonymous variadic macros were introduced in C99"); | |
93c80368 NB |
1397 | } |
1398 | else if (CPP_OPTION (pfile, pedantic)) | |
ebef4e8c NB |
1399 | cpp_error (pfile, DL_PEDWARN, |
1400 | "ISO C does not permit named variadic macros"); | |
711b8824 | 1401 | |
93c80368 | 1402 | /* We're at the end, and just expect a closing parenthesis. */ |
345894b4 NB |
1403 | token = _cpp_lex_token (pfile); |
1404 | if (token->type == CPP_CLOSE_PAREN) | |
23ff0223 | 1405 | return true; |
93c80368 | 1406 | /* Fall through. */ |
711b8824 | 1407 | |
93c80368 | 1408 | case CPP_EOF: |
ebef4e8c | 1409 | cpp_error (pfile, DL_ERROR, "missing ')' in macro parameter list"); |
23ff0223 | 1410 | return false; |
711b8824 | 1411 | } |
711b8824 | 1412 | } |
93c80368 NB |
1413 | } |
1414 | ||
14baae01 | 1415 | /* Allocate room for a token from a macro's replacement list. */ |
93c80368 | 1416 | static cpp_token * |
14baae01 | 1417 | alloc_expansion_token (pfile, macro) |
93c80368 NB |
1418 | cpp_reader *pfile; |
1419 | cpp_macro *macro; | |
1420 | { | |
8c3b2693 NB |
1421 | if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) |
1422 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); | |
711b8824 | 1423 | |
8c3b2693 | 1424 | return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; |
14baae01 NB |
1425 | } |
1426 | ||
d15a58c0 NB |
1427 | /* Lex a token from the expansion of MACRO, but mark parameters as we |
1428 | find them and warn of traditional stringification. */ | |
14baae01 NB |
1429 | static cpp_token * |
1430 | lex_expansion_token (pfile, macro) | |
1431 | cpp_reader *pfile; | |
1432 | cpp_macro *macro; | |
1433 | { | |
1434 | cpp_token *token; | |
1435 | ||
1436 | pfile->cur_token = alloc_expansion_token (pfile, macro); | |
1437 | token = _cpp_lex_direct (pfile); | |
93c80368 | 1438 | |
d15a58c0 | 1439 | /* Is this a parameter? */ |
4977bab6 ZW |
1440 | if (token->type == CPP_NAME |
1441 | && (token->val.node->flags & NODE_MACRO_ARG) != 0) | |
93c80368 NB |
1442 | { |
1443 | token->type = CPP_MACRO_ARG; | |
4977bab6 | 1444 | token->val.arg_no = token->val.node->value.arg_index; |
93c80368 NB |
1445 | } |
1446 | else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 | |
1447 | && (token->type == CPP_STRING || token->type == CPP_CHAR)) | |
1448 | check_trad_stringification (pfile, macro, &token->val.str); | |
1449 | ||
1450 | return token; | |
711b8824 ZW |
1451 | } |
1452 | ||
cbc69f84 NB |
1453 | static bool |
1454 | create_iso_definition (pfile, macro) | |
711b8824 | 1455 | cpp_reader *pfile; |
cbc69f84 | 1456 | cpp_macro *macro; |
711b8824 | 1457 | { |
cbc69f84 | 1458 | cpp_token *token; |
14baae01 | 1459 | const cpp_token *ctoken; |
93c80368 NB |
1460 | |
1461 | /* Get the first token of the expansion (or the '(' of a | |
1462 | function-like macro). */ | |
14baae01 NB |
1463 | ctoken = _cpp_lex_token (pfile); |
1464 | ||
1465 | if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) | |
93c80368 | 1466 | { |
cbc69f84 | 1467 | bool ok = parse_params (pfile, macro); |
8c3b2693 NB |
1468 | macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); |
1469 | if (!ok) | |
cbc69f84 | 1470 | return false; |
8c3b2693 NB |
1471 | |
1472 | /* Success. Commit the parameter array. */ | |
562a5c27 | 1473 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->params[macro->paramc]; |
93c80368 | 1474 | macro->fun_like = 1; |
93c80368 | 1475 | } |
14baae01 | 1476 | else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) |
ebef4e8c NB |
1477 | cpp_error (pfile, DL_PEDWARN, |
1478 | "ISO C requires whitespace after the macro name"); | |
711b8824 | 1479 | |
14baae01 NB |
1480 | if (macro->fun_like) |
1481 | token = lex_expansion_token (pfile, macro); | |
1482 | else | |
1483 | { | |
1484 | token = alloc_expansion_token (pfile, macro); | |
1485 | *token = *ctoken; | |
1486 | } | |
711b8824 | 1487 | |
93c80368 NB |
1488 | for (;;) |
1489 | { | |
1490 | /* Check the stringifying # constraint 6.10.3.2.1 of | |
1491 | function-like macros when lexing the subsequent token. */ | |
1492 | if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) | |
1493 | { | |
1494 | if (token->type == CPP_MACRO_ARG) | |
1495 | { | |
1496 | token->flags &= ~PREV_WHITE; | |
1497 | token->flags |= STRINGIFY_ARG; | |
1498 | token->flags |= token[-1].flags & PREV_WHITE; | |
1499 | token[-1] = token[0]; | |
1500 | macro->count--; | |
1501 | } | |
1502 | /* Let assembler get away with murder. */ | |
bdb05a7b | 1503 | else if (CPP_OPTION (pfile, lang) != CLK_ASM) |
93c80368 | 1504 | { |
ebef4e8c NB |
1505 | cpp_error (pfile, DL_ERROR, |
1506 | "'#' is not followed by a macro parameter"); | |
cbc69f84 | 1507 | return false; |
93c80368 NB |
1508 | } |
1509 | } | |
1510 | ||
1511 | if (token->type == CPP_EOF) | |
1512 | break; | |
1513 | ||
1514 | /* Paste operator constraint 6.10.3.3.1. */ | |
1515 | if (token->type == CPP_PASTE) | |
1516 | { | |
1517 | /* Token-paste ##, can appear in both object-like and | |
1518 | function-like macros, but not at the ends. */ | |
1519 | if (--macro->count > 0) | |
1520 | token = lex_expansion_token (pfile, macro); | |
1521 | ||
1522 | if (macro->count == 0 || token->type == CPP_EOF) | |
1523 | { | |
ebef4e8c | 1524 | cpp_error (pfile, DL_ERROR, |
93c80368 | 1525 | "'##' cannot appear at either end of a macro expansion"); |
cbc69f84 | 1526 | return false; |
93c80368 | 1527 | } |
711b8824 | 1528 | |
93c80368 | 1529 | token[-1].flags |= PASTE_LEFT; |
93c80368 NB |
1530 | } |
1531 | ||
1532 | token = lex_expansion_token (pfile, macro); | |
1533 | } | |
1534 | ||
601328bb | 1535 | macro->exp.tokens = (cpp_token *) BUFF_FRONT (pfile->a_buff); |
8c3b2693 | 1536 | |
4c2b647d NB |
1537 | /* Don't count the CPP_EOF. */ |
1538 | macro->count--; | |
93c80368 | 1539 | |
d15a58c0 | 1540 | /* Clear whitespace on first token for warn_of_redefinition(). */ |
8c3b2693 | 1541 | if (macro->count) |
601328bb | 1542 | macro->exp.tokens[0].flags &= ~PREV_WHITE; |
8c3b2693 NB |
1543 | |
1544 | /* Commit the memory. */ | |
601328bb | 1545 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->exp.tokens[macro->count]; |
8c3b2693 | 1546 | |
cbc69f84 NB |
1547 | return true; |
1548 | } | |
1549 | ||
da7d8304 | 1550 | /* Parse a macro and save its expansion. Returns nonzero on success. */ |
cbc69f84 NB |
1551 | bool |
1552 | _cpp_create_definition (pfile, node) | |
1553 | cpp_reader *pfile; | |
1554 | cpp_hashnode *node; | |
1555 | { | |
1556 | cpp_macro *macro; | |
1557 | unsigned int i; | |
1558 | bool ok; | |
44ed91a1 | 1559 | |
cbc69f84 NB |
1560 | macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); |
1561 | macro->line = pfile->directive_line; | |
1562 | macro->params = 0; | |
1563 | macro->paramc = 0; | |
1564 | macro->variadic = 0; | |
23345bbb | 1565 | macro->used = !CPP_OPTION (pfile, warn_unused_macros); |
cbc69f84 NB |
1566 | macro->count = 0; |
1567 | macro->fun_like = 0; | |
7065e130 | 1568 | /* To suppress some diagnostics. */ |
47d89cf3 | 1569 | macro->syshdr = pfile->map->sysp != 0; |
7065e130 | 1570 | |
cbc69f84 NB |
1571 | if (CPP_OPTION (pfile, traditional)) |
1572 | ok = _cpp_create_trad_definition (pfile, macro); | |
1573 | else | |
1574 | { | |
1575 | cpp_token *saved_cur_token = pfile->cur_token; | |
1576 | ||
1577 | ok = create_iso_definition (pfile, macro); | |
1578 | ||
1579 | /* Restore lexer position because of games lex_expansion_token() | |
1580 | plays lexing the macro. We set the type for SEEN_EOL() in | |
1581 | cpplib.c. | |
1582 | ||
1583 | Longer term we should lex the whole line before coming here, | |
1584 | and just copy the expansion. */ | |
1585 | saved_cur_token[-1].type = pfile->cur_token[-1].type; | |
1586 | pfile->cur_token = saved_cur_token; | |
1587 | ||
1588 | /* Stop the lexer accepting __VA_ARGS__. */ | |
1589 | pfile->state.va_args_ok = 0; | |
1590 | } | |
1591 | ||
1592 | /* Clear the fast argument lookup indices. */ | |
1593 | for (i = macro->paramc; i-- > 0; ) | |
4977bab6 ZW |
1594 | { |
1595 | struct cpp_hashnode *node = macro->params[i]; | |
1596 | node->flags &= ~ NODE_MACRO_ARG; | |
1597 | node->value = ((union _cpp_hashnode_value *) pfile->macro_buffer)[i]; | |
1598 | } | |
cbc69f84 NB |
1599 | |
1600 | if (!ok) | |
1601 | return ok; | |
1602 | ||
c2734e05 | 1603 | if (node->type == NT_MACRO) |
711b8824 | 1604 | { |
a69cbaac NB |
1605 | if (CPP_OPTION (pfile, warn_unused_macros)) |
1606 | _cpp_warn_if_unused_macro (pfile, node, NULL); | |
1607 | ||
cbc69f84 | 1608 | if (warn_of_redefinition (pfile, node, macro)) |
711b8824 | 1609 | { |
ebef4e8c NB |
1610 | cpp_error_with_line (pfile, DL_PEDWARN, pfile->directive_line, 0, |
1611 | "\"%s\" redefined", NODE_NAME (node)); | |
93c80368 | 1612 | |
618cdda7 | 1613 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) |
cbc69f84 NB |
1614 | cpp_error_with_line (pfile, DL_PEDWARN, |
1615 | node->value.macro->line, 0, | |
1616 | "this is the location of the previous definition"); | |
711b8824 | 1617 | } |
711b8824 ZW |
1618 | } |
1619 | ||
c2734e05 NB |
1620 | if (node->type != NT_VOID) |
1621 | _cpp_free_definition (node); | |
1622 | ||
711b8824 | 1623 | /* Enter definition in hash table. */ |
93c80368 NB |
1624 | node->type = NT_MACRO; |
1625 | node->value.macro = macro; | |
a28c5035 | 1626 | if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_"))) |
618cdda7 | 1627 | node->flags |= NODE_WARN; |
711b8824 | 1628 | |
93c80368 | 1629 | return ok; |
711b8824 ZW |
1630 | } |
1631 | ||
d15a58c0 NB |
1632 | /* Warn if a token in STRING matches one of a function-like MACRO's |
1633 | parameters. */ | |
e1aa5140 | 1634 | static void |
93c80368 | 1635 | check_trad_stringification (pfile, macro, string) |
e1aa5140 | 1636 | cpp_reader *pfile; |
93c80368 | 1637 | const cpp_macro *macro; |
e1aa5140 KG |
1638 | const cpp_string *string; |
1639 | { | |
93c80368 | 1640 | unsigned int i, len; |
562a5c27 | 1641 | const uchar *p, *q, *limit = string->text + string->len; |
df383483 | 1642 | |
e1aa5140 KG |
1643 | /* Loop over the string. */ |
1644 | for (p = string->text; p < limit; p = q) | |
1645 | { | |
e1aa5140 | 1646 | /* Find the start of an identifier. */ |
61c16b10 GM |
1647 | while (p < limit && !is_idstart (*p)) |
1648 | p++; | |
e1aa5140 KG |
1649 | |
1650 | /* Find the end of the identifier. */ | |
1651 | q = p; | |
61c16b10 GM |
1652 | while (q < limit && is_idchar (*q)) |
1653 | q++; | |
93c80368 NB |
1654 | |
1655 | len = q - p; | |
1656 | ||
e1aa5140 KG |
1657 | /* Loop over the function macro arguments to see if the |
1658 | identifier inside the string matches one of them. */ | |
93c80368 NB |
1659 | for (i = 0; i < macro->paramc; i++) |
1660 | { | |
1661 | const cpp_hashnode *node = macro->params[i]; | |
e1aa5140 | 1662 | |
2a967f3d NB |
1663 | if (NODE_LEN (node) == len |
1664 | && !memcmp (p, NODE_NAME (node), len)) | |
e1aa5140 | 1665 | { |
ebef4e8c | 1666 | cpp_error (pfile, DL_WARNING, |
f458d1d5 | 1667 | "macro argument \"%s\" would be stringified in traditional C", |
ebef4e8c | 1668 | NODE_NAME (node)); |
e1aa5140 KG |
1669 | break; |
1670 | } | |
1671 | } | |
1672 | } | |
1673 | } | |
93c80368 | 1674 | |
7096171b NB |
1675 | /* Returns the name, arguments and expansion of a macro, in a format |
1676 | suitable to be read back in again, and therefore also for DWARF 2 | |
1677 | debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". | |
1678 | Caller is expected to generate the "#define" bit if needed. The | |
93c80368 | 1679 | returned text is temporary, and automatically freed later. */ |
93c80368 NB |
1680 | const unsigned char * |
1681 | cpp_macro_definition (pfile, node) | |
1682 | cpp_reader *pfile; | |
1683 | const cpp_hashnode *node; | |
1684 | { | |
1685 | unsigned int i, len; | |
1686 | const cpp_macro *macro = node->value.macro; | |
1687 | unsigned char *buffer; | |
1688 | ||
1689 | if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) | |
1690 | { | |
ebef4e8c NB |
1691 | cpp_error (pfile, DL_ICE, |
1692 | "invalid hash type %d in cpp_macro_definition", node->type); | |
93c80368 NB |
1693 | return 0; |
1694 | } | |
1695 | ||
1696 | /* Calculate length. */ | |
8dc901de | 1697 | len = NODE_LEN (node) + 2; /* ' ' and NUL. */ |
93c80368 NB |
1698 | if (macro->fun_like) |
1699 | { | |
64d08263 JB |
1700 | len += 4; /* "()" plus possible final ".." of named |
1701 | varargs (we have + 1 below). */ | |
93c80368 | 1702 | for (i = 0; i < macro->paramc; i++) |
64d08263 | 1703 | len += NODE_LEN (macro->params[i]) + 1; /* "," */ |
93c80368 NB |
1704 | } |
1705 | ||
278c4662 NB |
1706 | if (CPP_OPTION (pfile, traditional)) |
1707 | len += _cpp_replacement_text_len (macro); | |
1708 | else | |
93c80368 | 1709 | { |
278c4662 NB |
1710 | for (i = 0; i < macro->count; i++) |
1711 | { | |
1712 | cpp_token *token = ¯o->exp.tokens[i]; | |
93c80368 | 1713 | |
278c4662 NB |
1714 | if (token->type == CPP_MACRO_ARG) |
1715 | len += NODE_LEN (macro->params[token->val.arg_no - 1]); | |
1716 | else | |
1717 | len += cpp_token_len (token); /* Includes room for ' '. */ | |
1718 | if (token->flags & STRINGIFY_ARG) | |
1719 | len++; /* "#" */ | |
1720 | if (token->flags & PASTE_LEFT) | |
1721 | len += 3; /* " ##" */ | |
1722 | } | |
93c80368 NB |
1723 | } |
1724 | ||
1725 | if (len > pfile->macro_buffer_len) | |
4b49c365 | 1726 | { |
562a5c27 | 1727 | pfile->macro_buffer = (uchar *) xrealloc (pfile->macro_buffer, len); |
4b49c365 AO |
1728 | pfile->macro_buffer_len = len; |
1729 | } | |
7096171b NB |
1730 | |
1731 | /* Fill in the buffer. Start with the macro name. */ | |
93c80368 | 1732 | buffer = pfile->macro_buffer; |
7096171b NB |
1733 | memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); |
1734 | buffer += NODE_LEN (node); | |
93c80368 NB |
1735 | |
1736 | /* Parameter names. */ | |
1737 | if (macro->fun_like) | |
1738 | { | |
1739 | *buffer++ = '('; | |
1740 | for (i = 0; i < macro->paramc; i++) | |
1741 | { | |
1742 | cpp_hashnode *param = macro->params[i]; | |
1743 | ||
1744 | if (param != pfile->spec_nodes.n__VA_ARGS__) | |
1745 | { | |
a28c5035 NB |
1746 | memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); |
1747 | buffer += NODE_LEN (param); | |
93c80368 NB |
1748 | } |
1749 | ||
1750 | if (i + 1 < macro->paramc) | |
df383483 KH |
1751 | /* Don't emit a space after the comma here; we're trying |
1752 | to emit a Dwarf-friendly definition, and the Dwarf spec | |
1753 | forbids spaces in the argument list. */ | |
64d08263 | 1754 | *buffer++ = ','; |
28e0f040 | 1755 | else if (macro->variadic) |
93c80368 NB |
1756 | *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; |
1757 | } | |
1758 | *buffer++ = ')'; | |
1759 | } | |
1760 | ||
e37b38d7 JB |
1761 | /* The Dwarf spec requires a space after the macro name, even if the |
1762 | definition is the empty string. */ | |
1763 | *buffer++ = ' '; | |
1764 | ||
278c4662 NB |
1765 | if (CPP_OPTION (pfile, traditional)) |
1766 | buffer = _cpp_copy_replacement_text (macro, buffer); | |
1767 | else if (macro->count) | |
93c80368 | 1768 | /* Expansion tokens. */ |
93c80368 | 1769 | { |
93c80368 NB |
1770 | for (i = 0; i < macro->count; i++) |
1771 | { | |
601328bb | 1772 | cpp_token *token = ¯o->exp.tokens[i]; |
93c80368 NB |
1773 | |
1774 | if (token->flags & PREV_WHITE) | |
1775 | *buffer++ = ' '; | |
1776 | if (token->flags & STRINGIFY_ARG) | |
1777 | *buffer++ = '#'; | |
1778 | ||
1779 | if (token->type == CPP_MACRO_ARG) | |
1780 | { | |
a28c5035 NB |
1781 | len = NODE_LEN (macro->params[token->val.arg_no - 1]); |
1782 | memcpy (buffer, | |
1783 | NODE_NAME (macro->params[token->val.arg_no - 1]), len); | |
93c80368 NB |
1784 | buffer += len; |
1785 | } | |
1786 | else | |
1787 | buffer = cpp_spell_token (pfile, token, buffer); | |
1788 | ||
1789 | if (token->flags & PASTE_LEFT) | |
1790 | { | |
1791 | *buffer++ = ' '; | |
1792 | *buffer++ = '#'; | |
1793 | *buffer++ = '#'; | |
1794 | /* Next has PREV_WHITE; see _cpp_create_definition. */ | |
1795 | } | |
1796 | } | |
1797 | } | |
1798 | ||
1799 | *buffer = '\0'; | |
1800 | return pfile->macro_buffer; | |
1801 | } |