]>
Commit | Line | Data |
---|---|---|
93c80368 | 1 | /* Part of CPP library. (Macro and #define handling.) |
711b8824 | 2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998, |
ee380365 TT |
3 | 1999, 2000, 2001, 2002, 2003, 2004, 2005, |
4 | 2006 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 | |
11 | Free Software Foundation; either version 2, or (at your option) any | |
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 | |
20 | along with this program; if not, write to the Free Software | |
200031d1 | 21 | Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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 | ||
6cf87ca4 ZW |
44 | static int enter_macro_context (cpp_reader *, cpp_hashnode *); |
45 | static int builtin_macro (cpp_reader *, cpp_hashnode *); | |
6cf87ca4 ZW |
46 | static void push_ptoken_context (cpp_reader *, cpp_hashnode *, _cpp_buff *, |
47 | const cpp_token **, unsigned int); | |
48 | static _cpp_buff *collect_args (cpp_reader *, const cpp_hashnode *); | |
49 | static cpp_context *next_context (cpp_reader *); | |
50 | static const cpp_token *padding_token (cpp_reader *, const cpp_token *); | |
51 | static void expand_arg (cpp_reader *, macro_arg *); | |
52 | static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int); | |
53 | static const cpp_token *stringify_arg (cpp_reader *, macro_arg *); | |
54 | static void paste_all_tokens (cpp_reader *, const cpp_token *); | |
55 | static bool paste_tokens (cpp_reader *, const cpp_token **, const cpp_token *); | |
56 | static void replace_args (cpp_reader *, cpp_hashnode *, cpp_macro *, | |
57 | macro_arg *); | |
58 | static _cpp_buff *funlike_invocation_p (cpp_reader *, cpp_hashnode *); | |
59 | static bool create_iso_definition (cpp_reader *, cpp_macro *); | |
93c80368 | 60 | |
93c80368 NB |
61 | /* #define directive parsing and handling. */ |
62 | ||
6cf87ca4 ZW |
63 | static cpp_token *alloc_expansion_token (cpp_reader *, cpp_macro *); |
64 | static cpp_token *lex_expansion_token (cpp_reader *, cpp_macro *); | |
65 | static bool warn_of_redefinition (cpp_reader *, const cpp_hashnode *, | |
66 | const cpp_macro *); | |
67 | static bool parse_params (cpp_reader *, cpp_macro *); | |
68 | static void check_trad_stringification (cpp_reader *, const cpp_macro *, | |
69 | const cpp_string *); | |
711b8824 | 70 | |
a69cbaac NB |
71 | /* Emits a warning if NODE is a macro defined in the main file that |
72 | has not been used. */ | |
73 | int | |
6cf87ca4 ZW |
74 | _cpp_warn_if_unused_macro (cpp_reader *pfile, cpp_hashnode *node, |
75 | void *v ATTRIBUTE_UNUSED) | |
a69cbaac NB |
76 | { |
77 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) | |
78 | { | |
79 | cpp_macro *macro = node->value.macro; | |
80 | ||
81 | if (!macro->used | |
50f59cd7 | 82 | && MAIN_FILE_P (linemap_lookup (pfile->line_table, macro->line))) |
0527bc4e | 83 | cpp_error_with_line (pfile, CPP_DL_WARNING, macro->line, 0, |
a69cbaac NB |
84 | "macro \"%s\" is not used", NODE_NAME (node)); |
85 | } | |
86 | ||
87 | return 1; | |
88 | } | |
89 | ||
4ed5bcfb NB |
90 | /* Allocates and returns a CPP_STRING token, containing TEXT of length |
91 | LEN, after null-terminating it. TEXT must be in permanent storage. */ | |
92 | static const cpp_token * | |
6cf87ca4 | 93 | new_string_token (cpp_reader *pfile, unsigned char *text, unsigned int len) |
93c80368 | 94 | { |
4ed5bcfb | 95 | cpp_token *token = _cpp_temp_token (pfile); |
93c80368 | 96 | |
4ed5bcfb | 97 | text[len] = '\0'; |
93c80368 | 98 | token->type = CPP_STRING; |
4ed5bcfb NB |
99 | token->val.str.len = len; |
100 | token->val.str.text = text; | |
93c80368 | 101 | token->flags = 0; |
4ed5bcfb | 102 | return token; |
93c80368 NB |
103 | } |
104 | ||
93c80368 NB |
105 | static const char * const monthnames[] = |
106 | { | |
107 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
108 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | |
109 | }; | |
110 | ||
21b11495 ZW |
111 | /* Helper function for builtin_macro. Returns the text generated by |
112 | a builtin macro. */ | |
278c4662 | 113 | const uchar * |
6cf87ca4 | 114 | _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node) |
93c80368 | 115 | { |
12f9df4e | 116 | const struct line_map *map; |
278c4662 NB |
117 | const uchar *result = NULL; |
118 | unsigned int number = 1; | |
644eddaa | 119 | |
93c80368 NB |
120 | switch (node->value.builtin) |
121 | { | |
4ed5bcfb | 122 | default: |
0527bc4e | 123 | cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", |
ebef4e8c | 124 | NODE_NAME (node)); |
278c4662 | 125 | break; |
4ed5bcfb | 126 | |
be8ac3e2 GZ |
127 | case BT_TIMESTAMP: |
128 | { | |
129 | cpp_buffer *pbuffer = cpp_get_buffer (pfile); | |
130 | if (pbuffer->timestamp == NULL) | |
131 | { | |
132 | /* Initialize timestamp value of the assotiated file. */ | |
133 | struct _cpp_file *file = cpp_get_file (pbuffer); | |
134 | if (file) | |
135 | { | |
136 | /* Generate __TIMESTAMP__ string, that represents | |
137 | the date and time of the last modification | |
138 | of the current source file. The string constant | |
139 | looks like "Sun Sep 16 01:03:52 1973". */ | |
140 | struct tm *tb = NULL; | |
141 | struct stat *st = _cpp_get_file_stat (file); | |
142 | if (st) | |
143 | tb = localtime (&st->st_mtime); | |
144 | if (tb) | |
145 | { | |
146 | char *str = asctime (tb); | |
147 | size_t len = strlen (str); | |
148 | unsigned char *buf = _cpp_unaligned_alloc (pfile, len + 2); | |
149 | buf[0] = '"'; | |
150 | strcpy ((char *) buf + 1, str); | |
151 | buf[len] = '"'; | |
152 | pbuffer->timestamp = buf; | |
153 | } | |
154 | else | |
155 | { | |
156 | cpp_errno (pfile, CPP_DL_WARNING, | |
157 | "could not determine file timestamp"); | |
158 | pbuffer->timestamp = U"\"??? ??? ?? ??:??:?? ????\""; | |
159 | } | |
160 | } | |
161 | } | |
162 | result = pbuffer->timestamp; | |
163 | } | |
164 | break; | |
93c80368 NB |
165 | case BT_FILE: |
166 | case BT_BASE_FILE: | |
711b8824 | 167 | { |
4ed5bcfb | 168 | unsigned int len; |
0bda4760 | 169 | const char *name; |
562a5c27 | 170 | uchar *buf; |
500bee0a | 171 | map = linemap_lookup (pfile->line_table, pfile->line_table->highest_line); |
0bda4760 NB |
172 | |
173 | if (node->value.builtin == BT_BASE_FILE) | |
bb74c963 | 174 | while (! MAIN_FILE_P (map)) |
50f59cd7 | 175 | map = INCLUDED_FROM (pfile->line_table, map); |
0bda4760 | 176 | |
bb74c963 | 177 | name = map->to_file; |
4ed5bcfb | 178 | len = strlen (name); |
651ed942 | 179 | buf = _cpp_unaligned_alloc (pfile, len * 2 + 3); |
278c4662 NB |
180 | result = buf; |
181 | *buf = '"'; | |
182 | buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len); | |
183 | *buf++ = '"'; | |
184 | *buf = '\0'; | |
711b8824 | 185 | } |
644eddaa NB |
186 | break; |
187 | ||
93c80368 | 188 | case BT_INCLUDE_LEVEL: |
d8693c6f NB |
189 | /* The line map depth counts the primary source as level 1, but |
190 | historically __INCLUDE_DEPTH__ has called the primary source | |
191 | level 0. */ | |
50f59cd7 | 192 | number = pfile->line_table->depth - 1; |
644eddaa | 193 | break; |
93c80368 NB |
194 | |
195 | case BT_SPECLINE: | |
500bee0a | 196 | map = &pfile->line_table->maps[pfile->line_table->used-1]; |
93c80368 NB |
197 | /* If __LINE__ is embedded in a macro, it must expand to the |
198 | line of the macro's invocation, not its definition. | |
199 | Otherwise things like assert() will not work properly. */ | |
278c4662 | 200 | if (CPP_OPTION (pfile, traditional)) |
500bee0a | 201 | number = pfile->line_table->highest_line; |
278c4662 | 202 | else |
12f9df4e PB |
203 | number = pfile->cur_token[-1].src_loc; |
204 | number = SOURCE_LINE (map, number); | |
644eddaa | 205 | break; |
93c80368 | 206 | |
5279d739 ZW |
207 | /* __STDC__ has the value 1 under normal circumstances. |
208 | However, if (a) we are in a system header, (b) the option | |
2a1dc0d8 ZW |
209 | stdc_0_in_system_headers is true (set by target config), and |
210 | (c) we are not in strictly conforming mode, then it has the | |
83900997 | 211 | value 0. (b) and (c) are already checked in cpp_init_builtins. */ |
93c80368 | 212 | case BT_STDC: |
83900997 JJ |
213 | if (cpp_in_system_header (pfile)) |
214 | number = 0; | |
215 | else | |
216 | number = 1; | |
644eddaa | 217 | break; |
711b8824 | 218 | |
93c80368 NB |
219 | case BT_DATE: |
220 | case BT_TIME: | |
278c4662 | 221 | if (pfile->date == NULL) |
93c80368 | 222 | { |
4ed5bcfb NB |
223 | /* Allocate __DATE__ and __TIME__ strings from permanent |
224 | storage. We only do this once, and don't generate them | |
225 | at init time, because time() and localtime() are very | |
226 | slow on some systems. */ | |
56da7207 ZW |
227 | time_t tt; |
228 | struct tm *tb = NULL; | |
229 | ||
230 | /* (time_t) -1 is a legitimate value for "number of seconds | |
231 | since the Epoch", so we have to do a little dance to | |
232 | distinguish that from a genuine error. */ | |
233 | errno = 0; | |
234 | tt = time(NULL); | |
235 | if (tt != (time_t)-1 || errno == 0) | |
236 | tb = localtime (&tt); | |
237 | ||
238 | if (tb) | |
239 | { | |
240 | pfile->date = _cpp_unaligned_alloc (pfile, | |
241 | sizeof ("\"Oct 11 1347\"")); | |
242 | sprintf ((char *) pfile->date, "\"%s %2d %4d\"", | |
6cf87ca4 ZW |
243 | monthnames[tb->tm_mon], tb->tm_mday, |
244 | tb->tm_year + 1900); | |
56da7207 ZW |
245 | |
246 | pfile->time = _cpp_unaligned_alloc (pfile, | |
247 | sizeof ("\"12:34:56\"")); | |
248 | sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", | |
249 | tb->tm_hour, tb->tm_min, tb->tm_sec); | |
250 | } | |
251 | else | |
252 | { | |
0527bc4e | 253 | cpp_errno (pfile, CPP_DL_WARNING, |
56da7207 ZW |
254 | "could not determine date and time"); |
255 | ||
256 | pfile->date = U"\"??? ?? ????\""; | |
257 | pfile->time = U"\"??:??:??\""; | |
258 | } | |
93c80368 | 259 | } |
93c80368 | 260 | |
644eddaa | 261 | if (node->value.builtin == BT_DATE) |
278c4662 | 262 | result = pfile->date; |
644eddaa | 263 | else |
278c4662 | 264 | result = pfile->time; |
644eddaa | 265 | break; |
278c4662 NB |
266 | } |
267 | ||
268 | if (result == NULL) | |
269 | { | |
270 | /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ | |
271 | result = _cpp_unaligned_alloc (pfile, 21); | |
272 | sprintf ((char *) result, "%u", number); | |
273 | } | |
274 | ||
275 | return result; | |
276 | } | |
277 | ||
278 | /* Convert builtin macros like __FILE__ to a token and push it on the | |
21b11495 ZW |
279 | context stack. Also handles _Pragma, for which a new token may not |
280 | be created. Returns 1 if it generates a new token context, 0 to | |
278c4662 NB |
281 | return the token to the caller. */ |
282 | static int | |
6cf87ca4 | 283 | builtin_macro (cpp_reader *pfile, cpp_hashnode *node) |
278c4662 NB |
284 | { |
285 | const uchar *buf; | |
26aea073 NB |
286 | size_t len; |
287 | char *nbuf; | |
644eddaa | 288 | |
278c4662 NB |
289 | if (node->value.builtin == BT_PRAGMA) |
290 | { | |
644eddaa NB |
291 | /* Don't interpret _Pragma within directives. The standard is |
292 | not clear on this, but to me this makes most sense. */ | |
293 | if (pfile->state.in_directive) | |
294 | return 0; | |
295 | ||
296 | _cpp_do__Pragma (pfile); | |
297 | return 1; | |
93c80368 | 298 | } |
644eddaa | 299 | |
278c4662 | 300 | buf = _cpp_builtin_macro_text (pfile, node); |
26aea073 | 301 | len = ustrlen (buf); |
c3f829c1 | 302 | nbuf = (char *) alloca (len + 1); |
26aea073 NB |
303 | memcpy (nbuf, buf, len); |
304 | nbuf[len]='\n'; | |
278c4662 | 305 | |
40de9f76 | 306 | cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true); |
26aea073 | 307 | _cpp_clean_line (pfile); |
278c4662 NB |
308 | |
309 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
310 | pfile->cur_token = _cpp_temp_token (pfile); | |
bc4071dd | 311 | _cpp_push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1); |
278c4662 | 312 | if (pfile->buffer->cur != pfile->buffer->rlimit) |
0527bc4e | 313 | cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", |
278c4662 NB |
314 | NODE_NAME (node)); |
315 | _cpp_pop_buffer (pfile); | |
316 | ||
644eddaa | 317 | return 1; |
711b8824 ZW |
318 | } |
319 | ||
d15a58c0 | 320 | /* Copies SRC, of length LEN, to DEST, adding backslashes before all |
651ed942 AP |
321 | backslashes and double quotes. DEST must be of sufficient size. |
322 | Returns a pointer to the end of the string. */ | |
562a5c27 | 323 | uchar * |
6cf87ca4 | 324 | cpp_quote_string (uchar *dest, const uchar *src, unsigned int len) |
93c80368 NB |
325 | { |
326 | while (len--) | |
327 | { | |
562a5c27 | 328 | uchar c = *src++; |
711b8824 | 329 | |
93c80368 NB |
330 | if (c == '\\' || c == '"') |
331 | { | |
332 | *dest++ = '\\'; | |
333 | *dest++ = c; | |
334 | } | |
335 | else | |
651ed942 | 336 | *dest++ = c; |
93c80368 | 337 | } |
711b8824 | 338 | |
93c80368 NB |
339 | return dest; |
340 | } | |
711b8824 | 341 | |
d15a58c0 NB |
342 | /* Convert a token sequence ARG to a single string token according to |
343 | the rules of the ISO C #-operator. */ | |
4ed5bcfb | 344 | static const cpp_token * |
6cf87ca4 | 345 | stringify_arg (cpp_reader *pfile, macro_arg *arg) |
93c80368 | 346 | { |
6338b358 | 347 | unsigned char *dest; |
ece54d54 | 348 | unsigned int i, escape_it, backslash_count = 0; |
4ed5bcfb | 349 | const cpp_token *source = NULL; |
ece54d54 | 350 | size_t len; |
711b8824 | 351 | |
6338b358 NB |
352 | if (BUFF_ROOM (pfile->u_buff) < 3) |
353 | _cpp_extend_buff (pfile, &pfile->u_buff, 3); | |
354 | dest = BUFF_FRONT (pfile->u_buff); | |
355 | *dest++ = '"'; | |
356 | ||
93c80368 NB |
357 | /* Loop, reading in the argument's tokens. */ |
358 | for (i = 0; i < arg->count; i++) | |
359 | { | |
4ed5bcfb | 360 | const cpp_token *token = arg->first[i]; |
4ed5bcfb NB |
361 | |
362 | if (token->type == CPP_PADDING) | |
363 | { | |
364 | if (source == NULL) | |
365 | source = token->val.source; | |
366 | continue; | |
367 | } | |
711b8824 | 368 | |
93c80368 | 369 | escape_it = (token->type == CPP_STRING || token->type == CPP_WSTRING |
cc937581 | 370 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); |
711b8824 | 371 | |
ece54d54 | 372 | /* Room for each char being written in octal, initial space and |
6338b358 | 373 | final quote and NUL. */ |
4ed5bcfb | 374 | len = cpp_token_len (token); |
93c80368 | 375 | if (escape_it) |
93c80368 | 376 | len *= 4; |
6338b358 | 377 | len += 3; |
711b8824 | 378 | |
ece54d54 | 379 | if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) |
93c80368 | 380 | { |
ece54d54 | 381 | size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); |
8c3b2693 | 382 | _cpp_extend_buff (pfile, &pfile->u_buff, len); |
ece54d54 | 383 | dest = BUFF_FRONT (pfile->u_buff) + len_so_far; |
93c80368 | 384 | } |
711b8824 | 385 | |
4ed5bcfb | 386 | /* Leading white space? */ |
6338b358 | 387 | if (dest - 1 != BUFF_FRONT (pfile->u_buff)) |
4ed5bcfb NB |
388 | { |
389 | if (source == NULL) | |
390 | source = token; | |
391 | if (source->flags & PREV_WHITE) | |
392 | *dest++ = ' '; | |
393 | } | |
394 | source = NULL; | |
711b8824 | 395 | |
93c80368 NB |
396 | if (escape_it) |
397 | { | |
ece54d54 NB |
398 | _cpp_buff *buff = _cpp_get_buff (pfile, len); |
399 | unsigned char *buf = BUFF_FRONT (buff); | |
47e20491 | 400 | len = cpp_spell_token (pfile, token, buf, true) - buf; |
dcc229e5 | 401 | dest = cpp_quote_string (dest, buf, len); |
ece54d54 | 402 | _cpp_release_buff (pfile, buff); |
93c80368 NB |
403 | } |
404 | else | |
47e20491 | 405 | dest = cpp_spell_token (pfile, token, dest, true); |
93c80368 | 406 | |
1067694a | 407 | if (token->type == CPP_OTHER && token->val.str.text[0] == '\\') |
93c80368 NB |
408 | backslash_count++; |
409 | else | |
410 | backslash_count = 0; | |
411 | } | |
412 | ||
413 | /* Ignore the final \ of invalid string literals. */ | |
414 | if (backslash_count & 1) | |
415 | { | |
0527bc4e | 416 | cpp_error (pfile, CPP_DL_WARNING, |
ebef4e8c | 417 | "invalid string literal, ignoring final '\\'"); |
ece54d54 | 418 | dest--; |
93c80368 NB |
419 | } |
420 | ||
4ed5bcfb | 421 | /* Commit the memory, including NUL, and return the token. */ |
6338b358 | 422 | *dest++ = '"'; |
ece54d54 NB |
423 | len = dest - BUFF_FRONT (pfile->u_buff); |
424 | BUFF_FRONT (pfile->u_buff) = dest + 1; | |
425 | return new_string_token (pfile, dest - len, len); | |
93c80368 NB |
426 | } |
427 | ||
da7d8304 | 428 | /* Try to paste two tokens. On success, return nonzero. In any |
c9e7a609 NB |
429 | case, PLHS is updated to point to the pasted token, which is |
430 | guaranteed to not have the PASTE_LEFT flag set. */ | |
431 | static bool | |
6cf87ca4 | 432 | paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs) |
d63eefbf | 433 | { |
de000d22 | 434 | unsigned char *buf, *end, *lhsend; |
fca35e1b | 435 | cpp_token *lhs; |
c9e7a609 | 436 | unsigned int len; |
c9e7a609 | 437 | |
fca35e1b | 438 | len = cpp_token_len (*plhs) + cpp_token_len (rhs) + 1; |
c3f829c1 | 439 | buf = (unsigned char *) alloca (len); |
fca35e1b | 440 | end = lhsend = cpp_spell_token (pfile, *plhs, buf, false); |
c9e7a609 NB |
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. */ | |
fca35e1b | 446 | if ((*plhs)->type == CPP_DIV && rhs->type != CPP_EQ) |
c9e7a609 | 447 | *end++ = ' '; |
47e20491 | 448 | end = cpp_spell_token (pfile, rhs, end, false); |
26aea073 | 449 | *end = '\n'; |
c9e7a609 | 450 | |
40de9f76 | 451 | cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true); |
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); | |
fca35e1b | 456 | lhs = _cpp_lex_direct (pfile); |
de000d22 JJ |
457 | if (pfile->buffer->cur != pfile->buffer->rlimit) |
458 | { | |
fca35e1b TT |
459 | source_location saved_loc = lhs->src_loc; |
460 | ||
de000d22 JJ |
461 | _cpp_pop_buffer (pfile); |
462 | _cpp_backup_tokens (pfile, 1); | |
463 | *lhsend = '\0'; | |
464 | ||
fca35e1b TT |
465 | /* We have to remove the PASTE_LEFT flag from the old lhs, but |
466 | we want to keep the new location. */ | |
467 | *lhs = **plhs; | |
468 | *plhs = lhs; | |
469 | lhs->src_loc = saved_loc; | |
470 | lhs->flags &= ~PASTE_LEFT; | |
471 | ||
de000d22 JJ |
472 | /* Mandatory error for all apart from assembler. */ |
473 | if (CPP_OPTION (pfile, lang) != CLK_ASM) | |
474 | cpp_error (pfile, CPP_DL_ERROR, | |
475 | "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", | |
476 | buf, cpp_token_as_text (pfile, rhs)); | |
477 | return false; | |
478 | } | |
c9e7a609 | 479 | |
fca35e1b | 480 | *plhs = lhs; |
de000d22 JJ |
481 | _cpp_pop_buffer (pfile); |
482 | return true; | |
d63eefbf NB |
483 | } |
484 | ||
d15a58c0 NB |
485 | /* Handles an arbitrarily long sequence of ## operators, with initial |
486 | operand LHS. This implementation is left-associative, | |
487 | non-recursive, and finishes a paste before handling succeeding | |
488 | ones. If a paste fails, we back up to the RHS of the failing ## | |
489 | operator before pushing the context containing the result of prior | |
490 | successful pastes, with the effect that the RHS appears in the | |
491 | output stream after the pasted LHS normally. */ | |
93c80368 | 492 | static void |
6cf87ca4 | 493 | paste_all_tokens (cpp_reader *pfile, const cpp_token *lhs) |
93c80368 | 494 | { |
4ed5bcfb NB |
495 | const cpp_token *rhs; |
496 | cpp_context *context = pfile->context; | |
497 | ||
93c80368 NB |
498 | do |
499 | { | |
500 | /* Take the token directly from the current context. We can do | |
501 | this, because we are in the replacement list of either an | |
502 | object-like macro, or a function-like macro with arguments | |
503 | inserted. In either case, the constraints to #define | |
d63eefbf | 504 | guarantee we have at least one more token. */ |
4ed5bcfb | 505 | if (context->direct_p) |
82eda77e | 506 | rhs = FIRST (context).token++; |
4ed5bcfb | 507 | else |
82eda77e | 508 | rhs = *FIRST (context).ptoken++; |
4ed5bcfb NB |
509 | |
510 | if (rhs->type == CPP_PADDING) | |
511 | abort (); | |
512 | ||
c9e7a609 | 513 | if (!paste_tokens (pfile, &lhs, rhs)) |
de000d22 | 514 | break; |
93c80368 NB |
515 | } |
516 | while (rhs->flags & PASTE_LEFT); | |
517 | ||
c9e7a609 | 518 | /* Put the resulting token in its own context. */ |
bc4071dd | 519 | _cpp_push_token_context (pfile, NULL, lhs, 1); |
93c80368 NB |
520 | } |
521 | ||
1ce676a0 NB |
522 | /* Returns TRUE if the number of arguments ARGC supplied in an |
523 | invocation of the MACRO referenced by NODE is valid. An empty | |
524 | invocation to a macro with no parameters should pass ARGC as zero. | |
525 | ||
526 | Note that MACRO cannot necessarily be deduced from NODE, in case | |
527 | NODE was redefined whilst collecting arguments. */ | |
528 | bool | |
6cf87ca4 | 529 | _cpp_arguments_ok (cpp_reader *pfile, cpp_macro *macro, const cpp_hashnode *node, unsigned int argc) |
1ce676a0 NB |
530 | { |
531 | if (argc == macro->paramc) | |
532 | return true; | |
533 | ||
534 | if (argc < macro->paramc) | |
535 | { | |
536 | /* As an extension, a rest argument is allowed to not appear in | |
537 | the invocation at all. | |
538 | e.g. #define debug(format, args...) something | |
539 | debug("string"); | |
540 | ||
541 | This is exactly the same as if there had been an empty rest | |
542 | argument - debug("string", ). */ | |
543 | ||
544 | if (argc + 1 == macro->paramc && macro->variadic) | |
545 | { | |
546 | if (CPP_PEDANTIC (pfile) && ! macro->syshdr) | |
0527bc4e | 547 | cpp_error (pfile, CPP_DL_PEDWARN, |
1ce676a0 NB |
548 | "ISO C99 requires rest arguments to be used"); |
549 | return true; | |
550 | } | |
551 | ||
0527bc4e | 552 | cpp_error (pfile, CPP_DL_ERROR, |
1ce676a0 NB |
553 | "macro \"%s\" requires %u arguments, but only %u given", |
554 | NODE_NAME (node), macro->paramc, argc); | |
555 | } | |
556 | else | |
0527bc4e | 557 | cpp_error (pfile, CPP_DL_ERROR, |
1ce676a0 NB |
558 | "macro \"%s\" passed %u arguments, but takes just %u", |
559 | NODE_NAME (node), argc, macro->paramc); | |
560 | ||
561 | return false; | |
562 | } | |
563 | ||
d15a58c0 NB |
564 | /* Reads and returns the arguments to a function-like macro |
565 | invocation. Assumes the opening parenthesis has been processed. | |
566 | If there is an error, emits an appropriate diagnostic and returns | |
567 | NULL. Each argument is terminated by a CPP_EOF token, for the | |
568 | future benefit of expand_arg(). */ | |
b8af0ca5 | 569 | static _cpp_buff * |
6cf87ca4 | 570 | collect_args (cpp_reader *pfile, const cpp_hashnode *node) |
93c80368 | 571 | { |
b8af0ca5 NB |
572 | _cpp_buff *buff, *base_buff; |
573 | cpp_macro *macro; | |
574 | macro_arg *args, *arg; | |
575 | const cpp_token *token; | |
576 | unsigned int argc; | |
b8af0ca5 NB |
577 | |
578 | macro = node->value.macro; | |
579 | if (macro->paramc) | |
580 | argc = macro->paramc; | |
581 | else | |
582 | argc = 1; | |
583 | buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) | |
584 | + sizeof (macro_arg))); | |
585 | base_buff = buff; | |
586 | args = (macro_arg *) buff->base; | |
587 | memset (args, 0, argc * sizeof (macro_arg)); | |
ece54d54 | 588 | buff->cur = (unsigned char *) &args[argc]; |
b8af0ca5 NB |
589 | arg = args, argc = 0; |
590 | ||
591 | /* Collect the tokens making up each argument. We don't yet know | |
592 | how many arguments have been supplied, whether too many or too | |
593 | few. Hence the slightly bizarre usage of "argc" and "arg". */ | |
594 | do | |
93c80368 | 595 | { |
b8af0ca5 NB |
596 | unsigned int paren_depth = 0; |
597 | unsigned int ntokens = 0; | |
93c80368 | 598 | |
b8af0ca5 NB |
599 | argc++; |
600 | arg->first = (const cpp_token **) buff->cur; | |
711b8824 | 601 | |
b8af0ca5 NB |
602 | for (;;) |
603 | { | |
604 | /* Require space for 2 new tokens (including a CPP_EOF). */ | |
ece54d54 | 605 | if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) |
b8af0ca5 | 606 | { |
8c3b2693 NB |
607 | buff = _cpp_append_extend_buff (pfile, buff, |
608 | 1000 * sizeof (cpp_token *)); | |
b8af0ca5 NB |
609 | arg->first = (const cpp_token **) buff->cur; |
610 | } | |
4ed5bcfb | 611 | |
b8af0ca5 | 612 | token = cpp_get_token (pfile); |
711b8824 | 613 | |
b8af0ca5 NB |
614 | if (token->type == CPP_PADDING) |
615 | { | |
616 | /* Drop leading padding. */ | |
617 | if (ntokens == 0) | |
618 | continue; | |
619 | } | |
620 | else if (token->type == CPP_OPEN_PAREN) | |
621 | paren_depth++; | |
622 | else if (token->type == CPP_CLOSE_PAREN) | |
623 | { | |
624 | if (paren_depth-- == 0) | |
625 | break; | |
626 | } | |
627 | else if (token->type == CPP_COMMA) | |
628 | { | |
629 | /* A comma does not terminate an argument within | |
630 | parentheses or as part of a variable argument. */ | |
631 | if (paren_depth == 0 | |
632 | && ! (macro->variadic && argc == macro->paramc)) | |
633 | break; | |
634 | } | |
635 | else if (token->type == CPP_EOF | |
636 | || (token->type == CPP_HASH && token->flags & BOL)) | |
637 | break; | |
93c80368 | 638 | |
b8af0ca5 NB |
639 | arg->first[ntokens++] = token; |
640 | } | |
93c80368 | 641 | |
b8af0ca5 NB |
642 | /* Drop trailing padding. */ |
643 | while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) | |
644 | ntokens--; | |
93c80368 | 645 | |
b8af0ca5 NB |
646 | arg->count = ntokens; |
647 | arg->first[ntokens] = &pfile->eof; | |
93c80368 | 648 | |
b8af0ca5 NB |
649 | /* Terminate the argument. Excess arguments loop back and |
650 | overwrite the final legitimate argument, before failing. */ | |
651 | if (argc <= macro->paramc) | |
652 | { | |
ece54d54 | 653 | buff->cur = (unsigned char *) &arg->first[ntokens + 1]; |
b8af0ca5 NB |
654 | if (argc != macro->paramc) |
655 | arg++; | |
656 | } | |
93c80368 | 657 | } |
e808ec9c | 658 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
93c80368 | 659 | |
e808ec9c | 660 | if (token->type == CPP_EOF) |
93c80368 | 661 | { |
ece54d54 NB |
662 | /* We still need the CPP_EOF to end directives, and to end |
663 | pre-expansion of a macro argument. Step back is not | |
664 | unconditional, since we don't want to return a CPP_EOF to our | |
665 | callers at the end of an -include-d file. */ | |
e808ec9c | 666 | if (pfile->context->prev || pfile->state.in_directive) |
b8af0ca5 | 667 | _cpp_backup_tokens (pfile, 1); |
0527bc4e | 668 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 669 | "unterminated argument list invoking macro \"%s\"", |
a28c5035 | 670 | NODE_NAME (node)); |
93c80368 | 671 | } |
1ce676a0 | 672 | else |
93c80368 | 673 | { |
1ce676a0 NB |
674 | /* A single empty argument is counted as no argument. */ |
675 | if (argc == 1 && macro->paramc == 0 && args[0].count == 0) | |
676 | argc = 0; | |
677 | if (_cpp_arguments_ok (pfile, macro, node, argc)) | |
58551c23 NB |
678 | { |
679 | /* GCC has special semantics for , ## b where b is a varargs | |
680 | parameter: we remove the comma if b was omitted entirely. | |
681 | If b was merely an empty argument, the comma is retained. | |
682 | If the macro takes just one (varargs) parameter, then we | |
683 | retain the comma only if we are standards conforming. | |
684 | ||
685 | If FIRST is NULL replace_args () swallows the comma. */ | |
686 | if (macro->variadic && (argc < macro->paramc | |
687 | || (argc == 1 && args[0].count == 0 | |
688 | && !CPP_OPTION (pfile, std)))) | |
689 | args[macro->paramc - 1].first = NULL; | |
690 | return base_buff; | |
691 | } | |
93c80368 NB |
692 | } |
693 | ||
1ce676a0 | 694 | /* An error occurred. */ |
b8af0ca5 NB |
695 | _cpp_release_buff (pfile, base_buff); |
696 | return NULL; | |
93c80368 NB |
697 | } |
698 | ||
d6da836d NB |
699 | /* Search for an opening parenthesis to the macro of NODE, in such a |
700 | way that, if none is found, we don't lose the information in any | |
701 | intervening padding tokens. If we find the parenthesis, collect | |
702 | the arguments and return the buffer containing them. */ | |
703 | static _cpp_buff * | |
6cf87ca4 | 704 | funlike_invocation_p (cpp_reader *pfile, cpp_hashnode *node) |
93c80368 | 705 | { |
d6da836d | 706 | const cpp_token *token, *padding = NULL; |
4ed5bcfb | 707 | |
d6da836d | 708 | for (;;) |
bdcbe496 | 709 | { |
d6da836d NB |
710 | token = cpp_get_token (pfile); |
711 | if (token->type != CPP_PADDING) | |
712 | break; | |
713 | if (padding == NULL | |
714 | || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) | |
715 | padding = token; | |
bdcbe496 | 716 | } |
93c80368 | 717 | |
d6da836d | 718 | if (token->type == CPP_OPEN_PAREN) |
93c80368 | 719 | { |
d6da836d NB |
720 | pfile->state.parsing_args = 2; |
721 | return collect_args (pfile, node); | |
93c80368 NB |
722 | } |
723 | ||
9ac3b1be NB |
724 | /* CPP_EOF can be the end of macro arguments, or the end of the |
725 | file. We mustn't back up over the latter. Ugh. */ | |
726 | if (token->type != CPP_EOF || token == &pfile->eof) | |
727 | { | |
728 | /* Back up. We may have skipped padding, in which case backing | |
729 | up more than one token when expanding macros is in general | |
730 | too difficult. We re-insert it in its own context. */ | |
731 | _cpp_backup_tokens (pfile, 1); | |
732 | if (padding) | |
bc4071dd | 733 | _cpp_push_token_context (pfile, NULL, padding, 1); |
9ac3b1be | 734 | } |
d6da836d NB |
735 | |
736 | return NULL; | |
93c80368 NB |
737 | } |
738 | ||
d15a58c0 NB |
739 | /* Push the context of a macro with hash entry NODE onto the context |
740 | stack. If we can successfully expand the macro, we push a context | |
741 | containing its yet-to-be-rescanned replacement list and return one. | |
742 | Otherwise, we don't push a context and return zero. */ | |
711b8824 | 743 | static int |
6cf87ca4 | 744 | enter_macro_context (cpp_reader *pfile, 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) | |
0527bc4e | 771 | cpp_error (pfile, CPP_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) |
bc4071dd | 789 | _cpp_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 |
6cf87ca4 | 803 | replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro, macro_arg *args) |
93c80368 NB |
804 | { |
805 | unsigned int i, total; | |
806 | const cpp_token *src, *limit; | |
4ed5bcfb | 807 | const cpp_token **dest, **first; |
93c80368 | 808 | macro_arg *arg; |
1e013d2e | 809 | _cpp_buff *buff; |
93c80368 | 810 | |
93c80368 | 811 | /* First, fully macro-expand arguments, calculating the number of |
1e013d2e NB |
812 | tokens in the final expansion as we go. The ordering of the if |
813 | statements below is subtle; we must handle stringification before | |
814 | pasting. */ | |
4ed5bcfb | 815 | total = macro->count; |
601328bb | 816 | limit = macro->exp.tokens + macro->count; |
4ed5bcfb | 817 | |
601328bb | 818 | for (src = macro->exp.tokens; src < limit; src++) |
93c80368 NB |
819 | if (src->type == CPP_MACRO_ARG) |
820 | { | |
4ed5bcfb NB |
821 | /* Leading and trailing padding tokens. */ |
822 | total += 2; | |
823 | ||
93c80368 NB |
824 | /* We have an argument. If it is not being stringified or |
825 | pasted it is macro-replaced before insertion. */ | |
6c53ebff | 826 | arg = &args[src->val.arg_no - 1]; |
4c2b647d | 827 | |
93c80368 NB |
828 | if (src->flags & STRINGIFY_ARG) |
829 | { | |
830 | if (!arg->stringified) | |
4ed5bcfb | 831 | arg->stringified = stringify_arg (pfile, arg); |
93c80368 NB |
832 | } |
833 | else if ((src->flags & PASTE_LEFT) | |
601328bb | 834 | || (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT))) |
93c80368 NB |
835 | total += arg->count - 1; |
836 | else | |
837 | { | |
838 | if (!arg->expanded) | |
4ed5bcfb | 839 | expand_arg (pfile, arg); |
93c80368 NB |
840 | total += arg->expanded_count - 1; |
841 | } | |
842 | } | |
843 | ||
4ed5bcfb NB |
844 | /* Now allocate space for the expansion, copy the tokens and replace |
845 | the arguments. */ | |
1e013d2e NB |
846 | buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); |
847 | first = (const cpp_token **) buff->base; | |
4ed5bcfb | 848 | dest = first; |
93c80368 | 849 | |
601328bb | 850 | for (src = macro->exp.tokens; src < limit; src++) |
4ed5bcfb NB |
851 | { |
852 | unsigned int count; | |
853 | const cpp_token **from, **paste_flag; | |
93c80368 | 854 | |
4ed5bcfb NB |
855 | if (src->type != CPP_MACRO_ARG) |
856 | { | |
857 | *dest++ = src; | |
858 | continue; | |
859 | } | |
93c80368 | 860 | |
4ed5bcfb NB |
861 | paste_flag = 0; |
862 | arg = &args[src->val.arg_no - 1]; | |
863 | if (src->flags & STRINGIFY_ARG) | |
864 | count = 1, from = &arg->stringified; | |
865 | else if (src->flags & PASTE_LEFT) | |
866 | count = arg->count, from = arg->first; | |
601328bb | 867 | else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)) |
4ed5bcfb NB |
868 | { |
869 | count = arg->count, from = arg->first; | |
870 | if (dest != first) | |
871 | { | |
4ed5bcfb NB |
872 | if (dest[-1]->type == CPP_COMMA |
873 | && macro->variadic | |
874 | && src->val.arg_no == macro->paramc) | |
875 | { | |
58551c23 NB |
876 | /* Swallow a pasted comma if from == NULL, otherwise |
877 | drop the paste flag. */ | |
878 | if (from == NULL) | |
4ed5bcfb NB |
879 | dest--; |
880 | else | |
881 | paste_flag = dest - 1; | |
882 | } | |
883 | /* Remove the paste flag if the RHS is a placemarker. */ | |
884 | else if (count == 0) | |
885 | paste_flag = dest - 1; | |
886 | } | |
887 | } | |
888 | else | |
889 | count = arg->expanded_count, from = arg->expanded; | |
4c2b647d | 890 | |
4ed5bcfb | 891 | /* Padding on the left of an argument (unless RHS of ##). */ |
a8d0ddaf | 892 | if ((!pfile->state.in_directive || pfile->state.directive_wants_padding) |
601328bb | 893 | && src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT)) |
4ed5bcfb | 894 | *dest++ = padding_token (pfile, src); |
93c80368 | 895 | |
4ed5bcfb NB |
896 | if (count) |
897 | { | |
898 | memcpy (dest, from, count * sizeof (cpp_token *)); | |
899 | dest += count; | |
93c80368 | 900 | |
4ed5bcfb NB |
901 | /* With a non-empty argument on the LHS of ##, the last |
902 | token should be flagged PASTE_LEFT. */ | |
903 | if (src->flags & PASTE_LEFT) | |
904 | paste_flag = dest - 1; | |
905 | } | |
26ec42ee | 906 | |
4ed5bcfb NB |
907 | /* Avoid paste on RHS (even case count == 0). */ |
908 | if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) | |
909 | *dest++ = &pfile->avoid_paste; | |
93c80368 | 910 | |
4ed5bcfb NB |
911 | /* Add a new paste flag, or remove an unwanted one. */ |
912 | if (paste_flag) | |
913 | { | |
914 | cpp_token *token = _cpp_temp_token (pfile); | |
915 | token->type = (*paste_flag)->type; | |
73096711 | 916 | token->val = (*paste_flag)->val; |
4ed5bcfb NB |
917 | if (src->flags & PASTE_LEFT) |
918 | token->flags = (*paste_flag)->flags | PASTE_LEFT; | |
919 | else | |
920 | token->flags = (*paste_flag)->flags & ~PASTE_LEFT; | |
921 | *paste_flag = token; | |
922 | } | |
923 | } | |
4c2b647d | 924 | |
93c80368 NB |
925 | /* Free the expanded arguments. */ |
926 | for (i = 0; i < macro->paramc; i++) | |
4ed5bcfb NB |
927 | if (args[i].expanded) |
928 | free (args[i].expanded); | |
929 | ||
644eddaa | 930 | push_ptoken_context (pfile, node, buff, first, dest - first); |
4ed5bcfb NB |
931 | } |
932 | ||
933 | /* Return a special padding token, with padding inherited from SOURCE. */ | |
934 | static const cpp_token * | |
6cf87ca4 | 935 | padding_token (cpp_reader *pfile, const cpp_token *source) |
4ed5bcfb NB |
936 | { |
937 | cpp_token *result = _cpp_temp_token (pfile); | |
938 | ||
939 | result->type = CPP_PADDING; | |
be0f1e54 PB |
940 | |
941 | /* Data in GCed data structures cannot be made const so far, so we | |
942 | need a cast here. */ | |
943 | result->val.source = (cpp_token *) source; | |
4ed5bcfb NB |
944 | result->flags = 0; |
945 | return result; | |
946 | } | |
947 | ||
d15a58c0 NB |
948 | /* Get a new uninitialized context. Create a new one if we cannot |
949 | re-use an old one. */ | |
4ed5bcfb | 950 | static cpp_context * |
6cf87ca4 | 951 | next_context (cpp_reader *pfile) |
4ed5bcfb NB |
952 | { |
953 | cpp_context *result = pfile->context->next; | |
954 | ||
955 | if (result == 0) | |
711b8824 | 956 | { |
72bb2c39 | 957 | result = XNEW (cpp_context); |
4ed5bcfb NB |
958 | result->prev = pfile->context; |
959 | result->next = 0; | |
960 | pfile->context->next = result; | |
93c80368 | 961 | } |
4ed5bcfb NB |
962 | |
963 | pfile->context = result; | |
964 | return result; | |
93c80368 NB |
965 | } |
966 | ||
4ed5bcfb NB |
967 | /* Push a list of pointers to tokens. */ |
968 | static void | |
6cf87ca4 ZW |
969 | push_ptoken_context (cpp_reader *pfile, cpp_hashnode *macro, _cpp_buff *buff, |
970 | const cpp_token **first, unsigned int count) | |
93c80368 NB |
971 | { |
972 | cpp_context *context = next_context (pfile); | |
93c80368 | 973 | |
4ed5bcfb NB |
974 | context->direct_p = false; |
975 | context->macro = macro; | |
1e013d2e | 976 | context->buff = buff; |
82eda77e NB |
977 | FIRST (context).ptoken = first; |
978 | LAST (context).ptoken = first + count; | |
4ed5bcfb NB |
979 | } |
980 | ||
981 | /* Push a list of tokens. */ | |
bc4071dd RH |
982 | void |
983 | _cpp_push_token_context (cpp_reader *pfile, cpp_hashnode *macro, | |
984 | const cpp_token *first, unsigned int count) | |
4ed5bcfb NB |
985 | { |
986 | cpp_context *context = next_context (pfile); | |
987 | ||
988 | context->direct_p = true; | |
989 | context->macro = macro; | |
1e013d2e | 990 | context->buff = NULL; |
82eda77e NB |
991 | FIRST (context).token = first; |
992 | LAST (context).token = first + count; | |
93c80368 NB |
993 | } |
994 | ||
cbc69f84 NB |
995 | /* Push a traditional macro's replacement text. */ |
996 | void | |
6cf87ca4 ZW |
997 | _cpp_push_text_context (cpp_reader *pfile, cpp_hashnode *macro, |
998 | const uchar *start, size_t len) | |
cbc69f84 NB |
999 | { |
1000 | cpp_context *context = next_context (pfile); | |
1001 | ||
1002 | context->direct_p = true; | |
1003 | context->macro = macro; | |
1004 | context->buff = NULL; | |
1005 | CUR (context) = start; | |
1ce676a0 | 1006 | RLIMIT (context) = start + len; |
974c43f1 | 1007 | macro->flags |= NODE_DISABLED; |
cbc69f84 NB |
1008 | } |
1009 | ||
d15a58c0 NB |
1010 | /* Expand an argument ARG before replacing parameters in a |
1011 | function-like macro. This works by pushing a context with the | |
1012 | argument's tokens, and then expanding that into a temporary buffer | |
1013 | as if it were a normal part of the token stream. collect_args() | |
1014 | has terminated the argument's tokens with a CPP_EOF so that we know | |
1015 | when we have fully expanded the argument. */ | |
93c80368 | 1016 | static void |
6cf87ca4 | 1017 | expand_arg (cpp_reader *pfile, macro_arg *arg) |
93c80368 | 1018 | { |
4ed5bcfb | 1019 | unsigned int capacity; |
56941bf2 | 1020 | bool saved_warn_trad; |
4ed5bcfb | 1021 | |
4ed5bcfb NB |
1022 | if (arg->count == 0) |
1023 | return; | |
93c80368 | 1024 | |
56941bf2 NB |
1025 | /* Don't warn about funlike macros when pre-expanding. */ |
1026 | saved_warn_trad = CPP_WTRADITIONAL (pfile); | |
1027 | CPP_WTRADITIONAL (pfile) = 0; | |
1028 | ||
93c80368 | 1029 | /* Loop, reading in the arguments. */ |
4ed5bcfb | 1030 | capacity = 256; |
c3f829c1 | 1031 | arg->expanded = XNEWVEC (const cpp_token *, capacity); |
93c80368 | 1032 | |
1e013d2e | 1033 | push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); |
4ed5bcfb | 1034 | for (;;) |
93c80368 | 1035 | { |
4ed5bcfb NB |
1036 | const cpp_token *token; |
1037 | ||
1038 | if (arg->expanded_count + 1 >= capacity) | |
711b8824 | 1039 | { |
93c80368 | 1040 | capacity *= 2; |
c3f829c1 GDR |
1041 | arg->expanded = XRESIZEVEC (const cpp_token *, arg->expanded, |
1042 | capacity); | |
93c80368 | 1043 | } |
93c80368 | 1044 | |
4ed5bcfb | 1045 | token = cpp_get_token (pfile); |
93c80368 | 1046 | |
4ed5bcfb NB |
1047 | if (token->type == CPP_EOF) |
1048 | break; | |
1049 | ||
1050 | arg->expanded[arg->expanded_count++] = token; | |
1051 | } | |
1052 | ||
1e013d2e | 1053 | _cpp_pop_context (pfile); |
56941bf2 NB |
1054 | |
1055 | CPP_WTRADITIONAL (pfile) = saved_warn_trad; | |
93c80368 NB |
1056 | } |
1057 | ||
d15a58c0 NB |
1058 | /* Pop the current context off the stack, re-enabling the macro if the |
1059 | context represented a macro's replacement list. The context | |
1060 | structure is not freed so that we can re-use it later. */ | |
93c80368 | 1061 | void |
6cf87ca4 | 1062 | _cpp_pop_context (cpp_reader *pfile) |
93c80368 | 1063 | { |
1e013d2e NB |
1064 | cpp_context *context = pfile->context; |
1065 | ||
1e013d2e | 1066 | if (context->macro) |
644eddaa | 1067 | context->macro->flags &= ~NODE_DISABLED; |
1e013d2e NB |
1068 | |
1069 | if (context->buff) | |
1070 | _cpp_release_buff (pfile, context->buff); | |
93c80368 | 1071 | |
1e013d2e | 1072 | pfile->context = context->prev; |
93c80368 NB |
1073 | } |
1074 | ||
48c4721e | 1075 | /* External routine to get a token. Also used nearly everywhere |
7f2f1a66 | 1076 | internally, except for places where we know we can safely call |
48c4721e | 1077 | _cpp_lex_token directly, such as lexing a directive name. |
7f2f1a66 NB |
1078 | |
1079 | Macro expansions and directives are transparently handled, | |
1080 | including entering included files. Thus tokens are post-macro | |
1081 | expansion, and after any intervening directives. External callers | |
1082 | see CPP_EOF only at EOF. Internal callers also see it when meeting | |
1083 | a directive inside a macro call, when at the end of a directive and | |
1084 | state.in_directive is still 1, and at the end of argument | |
1085 | pre-expansion. */ | |
4ed5bcfb | 1086 | const cpp_token * |
6cf87ca4 | 1087 | cpp_get_token (cpp_reader *pfile) |
93c80368 | 1088 | { |
4ed5bcfb NB |
1089 | const cpp_token *result; |
1090 | ||
29b10746 | 1091 | for (;;) |
93c80368 | 1092 | { |
4ed5bcfb | 1093 | cpp_hashnode *node; |
93c80368 NB |
1094 | cpp_context *context = pfile->context; |
1095 | ||
93c80368 | 1096 | /* Context->prev == 0 <=> base context. */ |
bdcbe496 | 1097 | if (!context->prev) |
4ed5bcfb | 1098 | result = _cpp_lex_token (pfile); |
82eda77e | 1099 | else if (FIRST (context).token != LAST (context).token) |
29b10746 | 1100 | { |
4ed5bcfb | 1101 | if (context->direct_p) |
82eda77e | 1102 | result = FIRST (context).token++; |
4ed5bcfb | 1103 | else |
82eda77e | 1104 | result = *FIRST (context).ptoken++; |
4ed5bcfb NB |
1105 | |
1106 | if (result->flags & PASTE_LEFT) | |
ec1a23e6 | 1107 | { |
4ed5bcfb NB |
1108 | paste_all_tokens (pfile, result); |
1109 | if (pfile->state.in_directive) | |
1110 | continue; | |
1111 | return padding_token (pfile, result); | |
ec1a23e6 | 1112 | } |
29b10746 | 1113 | } |
93c80368 NB |
1114 | else |
1115 | { | |
bdcbe496 | 1116 | _cpp_pop_context (pfile); |
4ed5bcfb NB |
1117 | if (pfile->state.in_directive) |
1118 | continue; | |
1119 | return &pfile->avoid_paste; | |
93c80368 | 1120 | } |
93c80368 | 1121 | |
477cdac7 JT |
1122 | if (pfile->state.in_directive && result->type == CPP_COMMENT) |
1123 | continue; | |
1124 | ||
4ed5bcfb | 1125 | if (result->type != CPP_NAME) |
93c80368 NB |
1126 | break; |
1127 | ||
4ed5bcfb NB |
1128 | node = result->val.node; |
1129 | ||
644eddaa NB |
1130 | if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) |
1131 | break; | |
df383483 | 1132 | |
644eddaa | 1133 | if (!(node->flags & NODE_DISABLED)) |
93c80368 | 1134 | { |
644eddaa NB |
1135 | if (!pfile->state.prevent_expansion |
1136 | && enter_macro_context (pfile, node)) | |
bd969772 | 1137 | { |
4ed5bcfb NB |
1138 | if (pfile->state.in_directive) |
1139 | continue; | |
1140 | return padding_token (pfile, result); | |
bd969772 | 1141 | } |
93c80368 | 1142 | } |
644eddaa NB |
1143 | else |
1144 | { | |
d15a58c0 NB |
1145 | /* Flag this token as always unexpandable. FIXME: move this |
1146 | to collect_args()?. */ | |
644eddaa NB |
1147 | cpp_token *t = _cpp_temp_token (pfile); |
1148 | t->type = result->type; | |
1149 | t->flags = result->flags | NO_EXPAND; | |
73096711 | 1150 | t->val = result->val; |
644eddaa NB |
1151 | result = t; |
1152 | } | |
a5c3cccd | 1153 | |
644eddaa | 1154 | break; |
93c80368 | 1155 | } |
4ed5bcfb NB |
1156 | |
1157 | return result; | |
93c80368 NB |
1158 | } |
1159 | ||
7065e130 NB |
1160 | /* Returns true if we're expanding an object-like macro that was |
1161 | defined in a system header. Just checks the macro at the top of | |
1162 | the stack. Used for diagnostic suppression. */ | |
1163 | int | |
6cf87ca4 | 1164 | cpp_sys_macro_p (cpp_reader *pfile) |
7065e130 | 1165 | { |
644eddaa | 1166 | cpp_hashnode *node = pfile->context->macro; |
7065e130 | 1167 | |
644eddaa | 1168 | return node && node->value.macro && node->value.macro->syshdr; |
7065e130 NB |
1169 | } |
1170 | ||
af0d16cd NB |
1171 | /* Read each token in, until end of the current file. Directives are |
1172 | transparently processed. */ | |
93c80368 | 1173 | void |
6cf87ca4 | 1174 | cpp_scan_nooutput (cpp_reader *pfile) |
93c80368 | 1175 | { |
22234f56 PB |
1176 | /* Request a CPP_EOF token at the end of this file, rather than |
1177 | transparently continuing with the including file. */ | |
1178 | pfile->buffer->return_at_eof = true; | |
1179 | ||
c6e83800 ZW |
1180 | pfile->state.discarding_output++; |
1181 | pfile->state.prevent_expansion++; | |
1182 | ||
590e1987 NB |
1183 | if (CPP_OPTION (pfile, traditional)) |
1184 | while (_cpp_read_logical_line_trad (pfile)) | |
1185 | ; | |
1186 | else | |
1187 | while (cpp_get_token (pfile)->type != CPP_EOF) | |
1188 | ; | |
c6e83800 ZW |
1189 | |
1190 | pfile->state.discarding_output--; | |
1191 | pfile->state.prevent_expansion--; | |
93c80368 NB |
1192 | } |
1193 | ||
1c90c6f9 | 1194 | /* Step back one (or more) tokens. Can only step back more than 1 if |
bdcbe496 | 1195 | they are from the lexer, and not from macro expansion. */ |
b528a07e | 1196 | void |
6cf87ca4 | 1197 | _cpp_backup_tokens (cpp_reader *pfile, unsigned int count) |
93c80368 | 1198 | { |
bdcbe496 | 1199 | if (pfile->context->prev == NULL) |
93c80368 | 1200 | { |
bdcbe496 NB |
1201 | pfile->lookaheads += count; |
1202 | while (count--) | |
1203 | { | |
3293c3e3 NB |
1204 | pfile->cur_token--; |
1205 | if (pfile->cur_token == pfile->cur_run->base | |
1206 | /* Possible with -fpreprocessed and no leading #line. */ | |
1207 | && pfile->cur_run->prev != NULL) | |
bdcbe496 | 1208 | { |
bdcbe496 NB |
1209 | pfile->cur_run = pfile->cur_run->prev; |
1210 | pfile->cur_token = pfile->cur_run->limit; | |
1211 | } | |
1212 | } | |
93c80368 | 1213 | } |
bdcbe496 | 1214 | else |
93c80368 | 1215 | { |
bdcbe496 NB |
1216 | if (count != 1) |
1217 | abort (); | |
4ed5bcfb | 1218 | if (pfile->context->direct_p) |
82eda77e | 1219 | FIRST (pfile->context).token--; |
4ed5bcfb | 1220 | else |
82eda77e | 1221 | FIRST (pfile->context).ptoken--; |
93c80368 NB |
1222 | } |
1223 | } | |
711b8824 | 1224 | |
93c80368 NB |
1225 | /* #define directive parsing and handling. */ |
1226 | ||
da7d8304 | 1227 | /* Returns nonzero if a macro redefinition warning is required. */ |
cbc69f84 | 1228 | static bool |
6cf87ca4 ZW |
1229 | warn_of_redefinition (cpp_reader *pfile, const cpp_hashnode *node, |
1230 | const cpp_macro *macro2) | |
93c80368 NB |
1231 | { |
1232 | const cpp_macro *macro1; | |
1233 | unsigned int i; | |
1234 | ||
618cdda7 NB |
1235 | /* Some redefinitions need to be warned about regardless. */ |
1236 | if (node->flags & NODE_WARN) | |
cbc69f84 | 1237 | return true; |
93c80368 | 1238 | |
618cdda7 | 1239 | /* Redefinition of a macro is allowed if and only if the old and new |
ec5c56db | 1240 | definitions are the same. (6.10.3 paragraph 2). */ |
93c80368 NB |
1241 | macro1 = node->value.macro; |
1242 | ||
6618c5d4 NB |
1243 | /* Don't check count here as it can be different in valid |
1244 | traditional redefinitions with just whitespace differences. */ | |
1245 | if (macro1->paramc != macro2->paramc | |
93c80368 | 1246 | || macro1->fun_like != macro2->fun_like |
28e0f040 | 1247 | || macro1->variadic != macro2->variadic) |
cbc69f84 | 1248 | return true; |
93c80368 NB |
1249 | |
1250 | /* Check parameter spellings. */ | |
1251 | for (i = 0; i < macro1->paramc; i++) | |
1252 | if (macro1->params[i] != macro2->params[i]) | |
cbc69f84 | 1253 | return true; |
93c80368 | 1254 | |
cbc69f84 NB |
1255 | /* Check the replacement text or tokens. */ |
1256 | if (CPP_OPTION (pfile, traditional)) | |
6618c5d4 | 1257 | return _cpp_expansions_different_trad (macro1, macro2); |
cbc69f84 | 1258 | |
a7f36da3 DD |
1259 | if (macro1->count != macro2->count) |
1260 | return true; | |
1261 | ||
1262 | for (i = 0; i < macro1->count; i++) | |
1263 | if (!_cpp_equiv_tokens (¯o1->exp.tokens[i], ¯o2->exp.tokens[i])) | |
1264 | return true; | |
cbc69f84 NB |
1265 | |
1266 | return false; | |
93c80368 NB |
1267 | } |
1268 | ||
1269 | /* Free the definition of hashnode H. */ | |
711b8824 | 1270 | void |
6cf87ca4 | 1271 | _cpp_free_definition (cpp_hashnode *h) |
711b8824 | 1272 | { |
93c80368 NB |
1273 | /* Macros and assertions no longer have anything to free. */ |
1274 | h->type = NT_VOID; | |
1275 | /* Clear builtin flag in case of redefinition. */ | |
644eddaa | 1276 | h->flags &= ~(NODE_BUILTIN | NODE_DISABLED); |
93c80368 NB |
1277 | } |
1278 | ||
14baae01 | 1279 | /* Save parameter NODE to the parameter list of macro MACRO. Returns |
da7d8304 | 1280 | zero on success, nonzero if the parameter is a duplicate. */ |
c70f6ed3 | 1281 | bool |
6cf87ca4 | 1282 | _cpp_save_parameter (cpp_reader *pfile, cpp_macro *macro, cpp_hashnode *node) |
93c80368 | 1283 | { |
4977bab6 | 1284 | unsigned int len; |
93c80368 | 1285 | /* Constraint 6.10.3.6 - duplicate parameter names. */ |
4977bab6 | 1286 | if (node->flags & NODE_MACRO_ARG) |
709e9e50 | 1287 | { |
0527bc4e | 1288 | cpp_error (pfile, CPP_DL_ERROR, "duplicate macro parameter \"%s\"", |
ebef4e8c | 1289 | NODE_NAME (node)); |
23ff0223 | 1290 | return true; |
93c80368 | 1291 | } |
709e9e50 | 1292 | |
8c3b2693 NB |
1293 | if (BUFF_ROOM (pfile->a_buff) |
1294 | < (macro->paramc + 1) * sizeof (cpp_hashnode *)) | |
1295 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); | |
709e9e50 | 1296 | |
8c3b2693 | 1297 | ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; |
4977bab6 ZW |
1298 | node->flags |= NODE_MACRO_ARG; |
1299 | len = macro->paramc * sizeof (union _cpp_hashnode_value); | |
1300 | if (len > pfile->macro_buffer_len) | |
1301 | { | |
c3f829c1 GDR |
1302 | pfile->macro_buffer = XRESIZEVEC (unsigned char, pfile->macro_buffer, |
1303 | len); | |
4977bab6 ZW |
1304 | pfile->macro_buffer_len = len; |
1305 | } | |
1306 | ((union _cpp_hashnode_value *) pfile->macro_buffer)[macro->paramc - 1] | |
1307 | = node->value; | |
1308 | ||
1309 | node->value.arg_index = macro->paramc; | |
23ff0223 | 1310 | return false; |
711b8824 ZW |
1311 | } |
1312 | ||
23ff0223 NB |
1313 | /* Check the syntax of the parameters in a MACRO definition. Returns |
1314 | false if an error occurs. */ | |
1315 | static bool | |
6cf87ca4 | 1316 | parse_params (cpp_reader *pfile, cpp_macro *macro) |
711b8824 | 1317 | { |
93c80368 | 1318 | unsigned int prev_ident = 0; |
711b8824 | 1319 | |
93c80368 | 1320 | for (;;) |
711b8824 | 1321 | { |
345894b4 | 1322 | const cpp_token *token = _cpp_lex_token (pfile); |
711b8824 | 1323 | |
345894b4 | 1324 | switch (token->type) |
711b8824 | 1325 | { |
93c80368 | 1326 | default: |
477cdac7 JT |
1327 | /* Allow/ignore comments in parameter lists if we are |
1328 | preserving comments in macro expansions. */ | |
1329 | if (token->type == CPP_COMMENT | |
1330 | && ! CPP_OPTION (pfile, discard_comments_in_macro_exp)) | |
1331 | continue; | |
1332 | ||
0527bc4e | 1333 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1334 | "\"%s\" may not appear in macro parameter list", |
345894b4 | 1335 | cpp_token_as_text (pfile, token)); |
23ff0223 | 1336 | return false; |
93c80368 | 1337 | |
711b8824 | 1338 | case CPP_NAME: |
93c80368 NB |
1339 | if (prev_ident) |
1340 | { | |
0527bc4e | 1341 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1342 | "macro parameters must be comma-separated"); |
23ff0223 | 1343 | return false; |
93c80368 NB |
1344 | } |
1345 | prev_ident = 1; | |
1346 | ||
c70f6ed3 | 1347 | if (_cpp_save_parameter (pfile, macro, token->val.node)) |
23ff0223 | 1348 | return false; |
93c80368 | 1349 | continue; |
711b8824 | 1350 | |
93c80368 NB |
1351 | case CPP_CLOSE_PAREN: |
1352 | if (prev_ident || macro->paramc == 0) | |
23ff0223 | 1353 | return true; |
711b8824 | 1354 | |
93c80368 NB |
1355 | /* Fall through to pick up the error. */ |
1356 | case CPP_COMMA: | |
1357 | if (!prev_ident) | |
1358 | { | |
0527bc4e | 1359 | cpp_error (pfile, CPP_DL_ERROR, "parameter name missing"); |
23ff0223 | 1360 | return false; |
93c80368 NB |
1361 | } |
1362 | prev_ident = 0; | |
711b8824 ZW |
1363 | continue; |
1364 | ||
93c80368 | 1365 | case CPP_ELLIPSIS: |
28e0f040 | 1366 | macro->variadic = 1; |
93c80368 NB |
1367 | if (!prev_ident) |
1368 | { | |
c70f6ed3 NB |
1369 | _cpp_save_parameter (pfile, macro, |
1370 | pfile->spec_nodes.n__VA_ARGS__); | |
93c80368 | 1371 | pfile->state.va_args_ok = 1; |
e5b79219 RH |
1372 | if (! CPP_OPTION (pfile, c99) |
1373 | && CPP_OPTION (pfile, pedantic) | |
1374 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
0527bc4e | 1375 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebef4e8c | 1376 | "anonymous variadic macros were introduced in C99"); |
93c80368 | 1377 | } |
e5b79219 RH |
1378 | else if (CPP_OPTION (pfile, pedantic) |
1379 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
0527bc4e | 1380 | cpp_error (pfile, CPP_DL_PEDWARN, |
ebef4e8c | 1381 | "ISO C does not permit named variadic macros"); |
711b8824 | 1382 | |
93c80368 | 1383 | /* We're at the end, and just expect a closing parenthesis. */ |
345894b4 NB |
1384 | token = _cpp_lex_token (pfile); |
1385 | if (token->type == CPP_CLOSE_PAREN) | |
23ff0223 | 1386 | return true; |
93c80368 | 1387 | /* Fall through. */ |
711b8824 | 1388 | |
93c80368 | 1389 | case CPP_EOF: |
0527bc4e | 1390 | cpp_error (pfile, CPP_DL_ERROR, "missing ')' in macro parameter list"); |
23ff0223 | 1391 | return false; |
711b8824 | 1392 | } |
711b8824 | 1393 | } |
93c80368 NB |
1394 | } |
1395 | ||
14baae01 | 1396 | /* Allocate room for a token from a macro's replacement list. */ |
93c80368 | 1397 | static cpp_token * |
6cf87ca4 | 1398 | alloc_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
93c80368 | 1399 | { |
8c3b2693 NB |
1400 | if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) |
1401 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); | |
711b8824 | 1402 | |
8c3b2693 | 1403 | return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; |
14baae01 NB |
1404 | } |
1405 | ||
d15a58c0 NB |
1406 | /* Lex a token from the expansion of MACRO, but mark parameters as we |
1407 | find them and warn of traditional stringification. */ | |
14baae01 | 1408 | static cpp_token * |
6cf87ca4 | 1409 | lex_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
14baae01 | 1410 | { |
ee380365 | 1411 | cpp_token *token, *saved_cur_token; |
14baae01 | 1412 | |
ee380365 | 1413 | saved_cur_token = pfile->cur_token; |
14baae01 NB |
1414 | pfile->cur_token = alloc_expansion_token (pfile, macro); |
1415 | token = _cpp_lex_direct (pfile); | |
ee380365 | 1416 | pfile->cur_token = saved_cur_token; |
93c80368 | 1417 | |
d15a58c0 | 1418 | /* Is this a parameter? */ |
4977bab6 ZW |
1419 | if (token->type == CPP_NAME |
1420 | && (token->val.node->flags & NODE_MACRO_ARG) != 0) | |
93c80368 NB |
1421 | { |
1422 | token->type = CPP_MACRO_ARG; | |
4977bab6 | 1423 | token->val.arg_no = token->val.node->value.arg_index; |
93c80368 NB |
1424 | } |
1425 | else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 | |
1426 | && (token->type == CPP_STRING || token->type == CPP_CHAR)) | |
1427 | check_trad_stringification (pfile, macro, &token->val.str); | |
1428 | ||
1429 | return token; | |
711b8824 ZW |
1430 | } |
1431 | ||
cbc69f84 | 1432 | static bool |
6cf87ca4 | 1433 | create_iso_definition (cpp_reader *pfile, cpp_macro *macro) |
711b8824 | 1434 | { |
cbc69f84 | 1435 | cpp_token *token; |
14baae01 | 1436 | const cpp_token *ctoken; |
93c80368 NB |
1437 | |
1438 | /* Get the first token of the expansion (or the '(' of a | |
1439 | function-like macro). */ | |
14baae01 NB |
1440 | ctoken = _cpp_lex_token (pfile); |
1441 | ||
1442 | if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) | |
93c80368 | 1443 | { |
cbc69f84 | 1444 | bool ok = parse_params (pfile, macro); |
8c3b2693 NB |
1445 | macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); |
1446 | if (!ok) | |
cbc69f84 | 1447 | return false; |
8c3b2693 | 1448 | |
d8044160 GK |
1449 | /* Success. Commit or allocate the parameter array. */ |
1450 | if (pfile->hash_table->alloc_subobject) | |
1451 | { | |
c3f829c1 GDR |
1452 | cpp_hashnode **params = |
1453 | (cpp_hashnode **) pfile->hash_table->alloc_subobject | |
1454 | (sizeof (cpp_hashnode *) * macro->paramc); | |
be0f1e54 PB |
1455 | memcpy (params, macro->params, |
1456 | sizeof (cpp_hashnode *) * macro->paramc); | |
1457 | macro->params = params; | |
d8044160 GK |
1458 | } |
1459 | else | |
1460 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->params[macro->paramc]; | |
93c80368 | 1461 | macro->fun_like = 1; |
93c80368 | 1462 | } |
14baae01 | 1463 | else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) |
cae064e7 JJ |
1464 | { |
1465 | /* While ISO C99 requires whitespace before replacement text | |
1466 | in a macro definition, ISO C90 with TC1 allows there characters | |
1467 | from the basic source character set. */ | |
1468 | if (CPP_OPTION (pfile, c99)) | |
1469 | cpp_error (pfile, CPP_DL_PEDWARN, | |
1470 | "ISO C99 requires whitespace after the macro name"); | |
1471 | else | |
1472 | { | |
1473 | int warntype = CPP_DL_WARNING; | |
1474 | switch (ctoken->type) | |
1475 | { | |
1476 | case CPP_ATSIGN: | |
1477 | case CPP_AT_NAME: | |
1478 | case CPP_OBJC_STRING: | |
1479 | /* '@' is not in basic character set. */ | |
1480 | warntype = CPP_DL_PEDWARN; | |
1481 | break; | |
1482 | case CPP_OTHER: | |
1483 | /* Basic character set sans letters, digits and _. */ | |
1484 | if (strchr ("!\"#%&'()*+,-./:;<=>?[\\]^{|}~", | |
1485 | ctoken->val.str.text[0]) == NULL) | |
1486 | warntype = CPP_DL_PEDWARN; | |
1487 | break; | |
1488 | default: | |
1489 | /* All other tokens start with a character from basic | |
1490 | character set. */ | |
1491 | break; | |
1492 | } | |
1493 | cpp_error (pfile, warntype, | |
1494 | "missing whitespace after the macro name"); | |
1495 | } | |
1496 | } | |
711b8824 | 1497 | |
14baae01 NB |
1498 | if (macro->fun_like) |
1499 | token = lex_expansion_token (pfile, macro); | |
1500 | else | |
1501 | { | |
1502 | token = alloc_expansion_token (pfile, macro); | |
1503 | *token = *ctoken; | |
1504 | } | |
711b8824 | 1505 | |
93c80368 NB |
1506 | for (;;) |
1507 | { | |
1508 | /* Check the stringifying # constraint 6.10.3.2.1 of | |
1509 | function-like macros when lexing the subsequent token. */ | |
1510 | if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) | |
1511 | { | |
1512 | if (token->type == CPP_MACRO_ARG) | |
1513 | { | |
1514 | token->flags &= ~PREV_WHITE; | |
1515 | token->flags |= STRINGIFY_ARG; | |
1516 | token->flags |= token[-1].flags & PREV_WHITE; | |
1517 | token[-1] = token[0]; | |
1518 | macro->count--; | |
1519 | } | |
1520 | /* Let assembler get away with murder. */ | |
bdb05a7b | 1521 | else if (CPP_OPTION (pfile, lang) != CLK_ASM) |
93c80368 | 1522 | { |
0527bc4e | 1523 | cpp_error (pfile, CPP_DL_ERROR, |
ebef4e8c | 1524 | "'#' is not followed by a macro parameter"); |
cbc69f84 | 1525 | return false; |
93c80368 NB |
1526 | } |
1527 | } | |
1528 | ||
1529 | if (token->type == CPP_EOF) | |
1530 | break; | |
1531 | ||
1532 | /* Paste operator constraint 6.10.3.3.1. */ | |
1533 | if (token->type == CPP_PASTE) | |
1534 | { | |
1535 | /* Token-paste ##, can appear in both object-like and | |
1536 | function-like macros, but not at the ends. */ | |
1537 | if (--macro->count > 0) | |
1538 | token = lex_expansion_token (pfile, macro); | |
1539 | ||
1540 | if (macro->count == 0 || token->type == CPP_EOF) | |
1541 | { | |
0527bc4e | 1542 | cpp_error (pfile, CPP_DL_ERROR, |
6cf87ca4 | 1543 | "'##' cannot appear at either end of a macro expansion"); |
cbc69f84 | 1544 | return false; |
93c80368 | 1545 | } |
711b8824 | 1546 | |
93c80368 | 1547 | token[-1].flags |= PASTE_LEFT; |
93c80368 NB |
1548 | } |
1549 | ||
1550 | token = lex_expansion_token (pfile, macro); | |
1551 | } | |
1552 | ||
601328bb | 1553 | macro->exp.tokens = (cpp_token *) BUFF_FRONT (pfile->a_buff); |
d8044160 | 1554 | macro->traditional = 0; |
8c3b2693 | 1555 | |
4c2b647d NB |
1556 | /* Don't count the CPP_EOF. */ |
1557 | macro->count--; | |
93c80368 | 1558 | |
d15a58c0 | 1559 | /* Clear whitespace on first token for warn_of_redefinition(). */ |
8c3b2693 | 1560 | if (macro->count) |
601328bb | 1561 | macro->exp.tokens[0].flags &= ~PREV_WHITE; |
8c3b2693 | 1562 | |
d8044160 GK |
1563 | /* Commit or allocate the memory. */ |
1564 | if (pfile->hash_table->alloc_subobject) | |
1565 | { | |
c3f829c1 GDR |
1566 | cpp_token *tokns = |
1567 | (cpp_token *) pfile->hash_table->alloc_subobject (sizeof (cpp_token) | |
1568 | * macro->count); | |
d8044160 GK |
1569 | memcpy (tokns, macro->exp.tokens, sizeof (cpp_token) * macro->count); |
1570 | macro->exp.tokens = tokns; | |
1571 | } | |
1572 | else | |
1573 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->exp.tokens[macro->count]; | |
8c3b2693 | 1574 | |
cbc69f84 NB |
1575 | return true; |
1576 | } | |
1577 | ||
da7d8304 | 1578 | /* Parse a macro and save its expansion. Returns nonzero on success. */ |
cbc69f84 | 1579 | bool |
6cf87ca4 | 1580 | _cpp_create_definition (cpp_reader *pfile, cpp_hashnode *node) |
cbc69f84 NB |
1581 | { |
1582 | cpp_macro *macro; | |
1583 | unsigned int i; | |
1584 | bool ok; | |
44ed91a1 | 1585 | |
d8044160 | 1586 | if (pfile->hash_table->alloc_subobject) |
c3f829c1 GDR |
1587 | macro = (cpp_macro *) pfile->hash_table->alloc_subobject |
1588 | (sizeof (cpp_macro)); | |
d8044160 GK |
1589 | else |
1590 | macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); | |
cbc69f84 NB |
1591 | macro->line = pfile->directive_line; |
1592 | macro->params = 0; | |
1593 | macro->paramc = 0; | |
1594 | macro->variadic = 0; | |
23345bbb | 1595 | macro->used = !CPP_OPTION (pfile, warn_unused_macros); |
cbc69f84 NB |
1596 | macro->count = 0; |
1597 | macro->fun_like = 0; | |
7065e130 | 1598 | /* To suppress some diagnostics. */ |
12f9df4e | 1599 | macro->syshdr = pfile->buffer && pfile->buffer->sysp != 0; |
7065e130 | 1600 | |
cbc69f84 NB |
1601 | if (CPP_OPTION (pfile, traditional)) |
1602 | ok = _cpp_create_trad_definition (pfile, macro); | |
1603 | else | |
1604 | { | |
cbc69f84 NB |
1605 | ok = create_iso_definition (pfile, macro); |
1606 | ||
ee380365 | 1607 | /* We set the type for SEEN_EOL() in directives.c. |
cbc69f84 NB |
1608 | |
1609 | Longer term we should lex the whole line before coming here, | |
1610 | and just copy the expansion. */ | |
cbc69f84 NB |
1611 | |
1612 | /* Stop the lexer accepting __VA_ARGS__. */ | |
1613 | pfile->state.va_args_ok = 0; | |
1614 | } | |
1615 | ||
1616 | /* Clear the fast argument lookup indices. */ | |
1617 | for (i = macro->paramc; i-- > 0; ) | |
4977bab6 ZW |
1618 | { |
1619 | struct cpp_hashnode *node = macro->params[i]; | |
1620 | node->flags &= ~ NODE_MACRO_ARG; | |
1621 | node->value = ((union _cpp_hashnode_value *) pfile->macro_buffer)[i]; | |
1622 | } | |
cbc69f84 NB |
1623 | |
1624 | if (!ok) | |
1625 | return ok; | |
1626 | ||
c2734e05 | 1627 | if (node->type == NT_MACRO) |
711b8824 | 1628 | { |
a69cbaac NB |
1629 | if (CPP_OPTION (pfile, warn_unused_macros)) |
1630 | _cpp_warn_if_unused_macro (pfile, node, NULL); | |
1631 | ||
cbc69f84 | 1632 | if (warn_of_redefinition (pfile, node, macro)) |
711b8824 | 1633 | { |
0527bc4e | 1634 | cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->directive_line, 0, |
ebef4e8c | 1635 | "\"%s\" redefined", NODE_NAME (node)); |
93c80368 | 1636 | |
618cdda7 | 1637 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) |
0527bc4e | 1638 | cpp_error_with_line (pfile, CPP_DL_PEDWARN, |
cbc69f84 NB |
1639 | node->value.macro->line, 0, |
1640 | "this is the location of the previous definition"); | |
711b8824 | 1641 | } |
711b8824 ZW |
1642 | } |
1643 | ||
c2734e05 NB |
1644 | if (node->type != NT_VOID) |
1645 | _cpp_free_definition (node); | |
1646 | ||
711b8824 | 1647 | /* Enter definition in hash table. */ |
93c80368 NB |
1648 | node->type = NT_MACRO; |
1649 | node->value.macro = macro; | |
a28c5035 | 1650 | if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_"))) |
618cdda7 | 1651 | node->flags |= NODE_WARN; |
711b8824 | 1652 | |
93c80368 | 1653 | return ok; |
711b8824 ZW |
1654 | } |
1655 | ||
d15a58c0 NB |
1656 | /* Warn if a token in STRING matches one of a function-like MACRO's |
1657 | parameters. */ | |
e1aa5140 | 1658 | static void |
6cf87ca4 ZW |
1659 | check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro, |
1660 | const cpp_string *string) | |
e1aa5140 | 1661 | { |
93c80368 | 1662 | unsigned int i, len; |
6338b358 | 1663 | const uchar *p, *q, *limit; |
df383483 | 1664 | |
e1aa5140 | 1665 | /* Loop over the string. */ |
6338b358 NB |
1666 | limit = string->text + string->len - 1; |
1667 | for (p = string->text + 1; p < limit; p = q) | |
e1aa5140 | 1668 | { |
e1aa5140 | 1669 | /* Find the start of an identifier. */ |
61c16b10 GM |
1670 | while (p < limit && !is_idstart (*p)) |
1671 | p++; | |
e1aa5140 KG |
1672 | |
1673 | /* Find the end of the identifier. */ | |
1674 | q = p; | |
61c16b10 GM |
1675 | while (q < limit && is_idchar (*q)) |
1676 | q++; | |
93c80368 NB |
1677 | |
1678 | len = q - p; | |
1679 | ||
e1aa5140 KG |
1680 | /* Loop over the function macro arguments to see if the |
1681 | identifier inside the string matches one of them. */ | |
93c80368 NB |
1682 | for (i = 0; i < macro->paramc; i++) |
1683 | { | |
1684 | const cpp_hashnode *node = macro->params[i]; | |
e1aa5140 | 1685 | |
2a967f3d NB |
1686 | if (NODE_LEN (node) == len |
1687 | && !memcmp (p, NODE_NAME (node), len)) | |
e1aa5140 | 1688 | { |
0527bc4e | 1689 | cpp_error (pfile, CPP_DL_WARNING, |
f458d1d5 | 1690 | "macro argument \"%s\" would be stringified in traditional C", |
ebef4e8c | 1691 | NODE_NAME (node)); |
e1aa5140 KG |
1692 | break; |
1693 | } | |
1694 | } | |
1695 | } | |
1696 | } | |
93c80368 | 1697 | |
7096171b NB |
1698 | /* Returns the name, arguments and expansion of a macro, in a format |
1699 | suitable to be read back in again, and therefore also for DWARF 2 | |
1700 | debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". | |
1701 | Caller is expected to generate the "#define" bit if needed. The | |
93c80368 | 1702 | returned text is temporary, and automatically freed later. */ |
93c80368 | 1703 | const unsigned char * |
6cf87ca4 | 1704 | cpp_macro_definition (cpp_reader *pfile, const cpp_hashnode *node) |
93c80368 NB |
1705 | { |
1706 | unsigned int i, len; | |
1707 | const cpp_macro *macro = node->value.macro; | |
1708 | unsigned char *buffer; | |
1709 | ||
1710 | if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) | |
1711 | { | |
0527bc4e | 1712 | cpp_error (pfile, CPP_DL_ICE, |
ebef4e8c | 1713 | "invalid hash type %d in cpp_macro_definition", node->type); |
93c80368 NB |
1714 | return 0; |
1715 | } | |
1716 | ||
1717 | /* Calculate length. */ | |
8dc901de | 1718 | len = NODE_LEN (node) + 2; /* ' ' and NUL. */ |
93c80368 NB |
1719 | if (macro->fun_like) |
1720 | { | |
64d08263 JB |
1721 | len += 4; /* "()" plus possible final ".." of named |
1722 | varargs (we have + 1 below). */ | |
93c80368 | 1723 | for (i = 0; i < macro->paramc; i++) |
64d08263 | 1724 | len += NODE_LEN (macro->params[i]) + 1; /* "," */ |
93c80368 NB |
1725 | } |
1726 | ||
6da55c00 | 1727 | /* This should match below where we fill in the buffer. */ |
278c4662 NB |
1728 | if (CPP_OPTION (pfile, traditional)) |
1729 | len += _cpp_replacement_text_len (macro); | |
1730 | else | |
93c80368 | 1731 | { |
278c4662 NB |
1732 | for (i = 0; i < macro->count; i++) |
1733 | { | |
1734 | cpp_token *token = ¯o->exp.tokens[i]; | |
93c80368 | 1735 | |
278c4662 NB |
1736 | if (token->type == CPP_MACRO_ARG) |
1737 | len += NODE_LEN (macro->params[token->val.arg_no - 1]); | |
1738 | else | |
6da55c00 EC |
1739 | len += cpp_token_len (token); |
1740 | ||
278c4662 NB |
1741 | if (token->flags & STRINGIFY_ARG) |
1742 | len++; /* "#" */ | |
1743 | if (token->flags & PASTE_LEFT) | |
1744 | len += 3; /* " ##" */ | |
6da55c00 EC |
1745 | if (token->flags & PREV_WHITE) |
1746 | len++; /* " " */ | |
278c4662 | 1747 | } |
93c80368 NB |
1748 | } |
1749 | ||
1750 | if (len > pfile->macro_buffer_len) | |
4b49c365 | 1751 | { |
c3f829c1 GDR |
1752 | pfile->macro_buffer = XRESIZEVEC (unsigned char, |
1753 | pfile->macro_buffer, len); | |
4b49c365 AO |
1754 | pfile->macro_buffer_len = len; |
1755 | } | |
7096171b NB |
1756 | |
1757 | /* Fill in the buffer. Start with the macro name. */ | |
93c80368 | 1758 | buffer = pfile->macro_buffer; |
7096171b NB |
1759 | memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); |
1760 | buffer += NODE_LEN (node); | |
93c80368 NB |
1761 | |
1762 | /* Parameter names. */ | |
1763 | if (macro->fun_like) | |
1764 | { | |
1765 | *buffer++ = '('; | |
1766 | for (i = 0; i < macro->paramc; i++) | |
1767 | { | |
1768 | cpp_hashnode *param = macro->params[i]; | |
1769 | ||
1770 | if (param != pfile->spec_nodes.n__VA_ARGS__) | |
1771 | { | |
a28c5035 NB |
1772 | memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); |
1773 | buffer += NODE_LEN (param); | |
93c80368 NB |
1774 | } |
1775 | ||
1776 | if (i + 1 < macro->paramc) | |
df383483 KH |
1777 | /* Don't emit a space after the comma here; we're trying |
1778 | to emit a Dwarf-friendly definition, and the Dwarf spec | |
1779 | forbids spaces in the argument list. */ | |
64d08263 | 1780 | *buffer++ = ','; |
28e0f040 | 1781 | else if (macro->variadic) |
93c80368 NB |
1782 | *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; |
1783 | } | |
1784 | *buffer++ = ')'; | |
1785 | } | |
1786 | ||
e37b38d7 JB |
1787 | /* The Dwarf spec requires a space after the macro name, even if the |
1788 | definition is the empty string. */ | |
1789 | *buffer++ = ' '; | |
1790 | ||
278c4662 NB |
1791 | if (CPP_OPTION (pfile, traditional)) |
1792 | buffer = _cpp_copy_replacement_text (macro, buffer); | |
1793 | else if (macro->count) | |
93c80368 | 1794 | /* Expansion tokens. */ |
93c80368 | 1795 | { |
93c80368 NB |
1796 | for (i = 0; i < macro->count; i++) |
1797 | { | |
601328bb | 1798 | cpp_token *token = ¯o->exp.tokens[i]; |
93c80368 NB |
1799 | |
1800 | if (token->flags & PREV_WHITE) | |
1801 | *buffer++ = ' '; | |
1802 | if (token->flags & STRINGIFY_ARG) | |
1803 | *buffer++ = '#'; | |
1804 | ||
1805 | if (token->type == CPP_MACRO_ARG) | |
1806 | { | |
a28c5035 | 1807 | memcpy (buffer, |
6da55c00 EC |
1808 | NODE_NAME (macro->params[token->val.arg_no - 1]), |
1809 | NODE_LEN (macro->params[token->val.arg_no - 1])); | |
1810 | buffer += NODE_LEN (macro->params[token->val.arg_no - 1]); | |
93c80368 NB |
1811 | } |
1812 | else | |
47e20491 | 1813 | buffer = cpp_spell_token (pfile, token, buffer, false); |
93c80368 NB |
1814 | |
1815 | if (token->flags & PASTE_LEFT) | |
1816 | { | |
1817 | *buffer++ = ' '; | |
1818 | *buffer++ = '#'; | |
1819 | *buffer++ = '#'; | |
1820 | /* Next has PREV_WHITE; see _cpp_create_definition. */ | |
1821 | } | |
1822 | } | |
1823 | } | |
1824 | ||
1825 | *buffer = '\0'; | |
1826 | return pfile->macro_buffer; | |
1827 | } |