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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, |
5d8ebbd8 | 3 | 1999, 2000, 2001, 2002 Free Software Foundation, Inc. |
711b8824 ZW |
4 | Written by Per Bothner, 1994. |
5 | Based on CCCP program by Paul Rubin, June 1986 | |
6 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by the | |
10 | Free Software Foundation; either version 2, or (at your option) any | |
11 | later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
21 | ||
22 | In other words, you are welcome to use, share and improve this program. | |
23 | You are forbidden to forbid anyone else to use, share and improve | |
24 | what you give them. Help stamp out software-hoarding! */ | |
25 | ||
26 | #include "config.h" | |
27 | #include "system.h" | |
28 | #include "cpplib.h" | |
29 | #include "cpphash.h" | |
30 | ||
93c80368 | 31 | struct cpp_macro |
711b8824 | 32 | { |
93c80368 | 33 | cpp_hashnode **params; /* Parameters, if any. */ |
6d2f8887 | 34 | cpp_token *expansion; /* First token of replacement list. */ |
93c80368 NB |
35 | unsigned int line; /* Starting line number. */ |
36 | unsigned int count; /* Number of tokens in expansion. */ | |
37 | unsigned short paramc; /* Number of parameters. */ | |
38 | unsigned int fun_like : 1; /* If a function-like macro. */ | |
28e0f040 | 39 | unsigned int variadic : 1; /* If a variadic macro. */ |
7065e130 | 40 | unsigned int syshdr : 1; /* If macro defined in system header. */ |
93c80368 NB |
41 | }; |
42 | ||
43 | typedef struct macro_arg macro_arg; | |
44 | struct macro_arg | |
45 | { | |
4ed5bcfb | 46 | const cpp_token **first; /* First token in unexpanded argument. */ |
6d2f8887 | 47 | const cpp_token **expanded; /* Macro-expanded argument. */ |
4ed5bcfb | 48 | const cpp_token *stringified; /* Stringified argument. */ |
93c80368 NB |
49 | unsigned int count; /* # of tokens in argument. */ |
50 | unsigned int expanded_count; /* # of tokens in expanded argument. */ | |
711b8824 ZW |
51 | }; |
52 | ||
93c80368 NB |
53 | /* Macro expansion. */ |
54 | ||
29b10746 | 55 | static int enter_macro_context PARAMS ((cpp_reader *, cpp_hashnode *)); |
644eddaa | 56 | static int builtin_macro PARAMS ((cpp_reader *, cpp_hashnode *)); |
4ed5bcfb | 57 | static void push_token_context |
644eddaa | 58 | PARAMS ((cpp_reader *, cpp_hashnode *, const cpp_token *, unsigned int)); |
4ed5bcfb | 59 | static void push_ptoken_context |
644eddaa | 60 | PARAMS ((cpp_reader *, cpp_hashnode *, _cpp_buff *, |
1e013d2e | 61 | const cpp_token **, unsigned int)); |
b8af0ca5 | 62 | static _cpp_buff *collect_args PARAMS ((cpp_reader *, const cpp_hashnode *)); |
93c80368 | 63 | static cpp_context *next_context PARAMS ((cpp_reader *)); |
4ed5bcfb NB |
64 | static const cpp_token *padding_token |
65 | PARAMS ((cpp_reader *, const cpp_token *)); | |
93c80368 NB |
66 | static void expand_arg PARAMS ((cpp_reader *, macro_arg *)); |
67 | static unsigned char *quote_string PARAMS ((unsigned char *, | |
68 | const unsigned char *, | |
69 | unsigned int)); | |
4ed5bcfb NB |
70 | static const cpp_token *new_string_token PARAMS ((cpp_reader *, U_CHAR *, |
71 | unsigned int)); | |
d15a58c0 | 72 | static const cpp_token *new_number_token PARAMS ((cpp_reader *, unsigned int)); |
4ed5bcfb NB |
73 | static const cpp_token *stringify_arg PARAMS ((cpp_reader *, macro_arg *)); |
74 | static void paste_all_tokens PARAMS ((cpp_reader *, const cpp_token *)); | |
c9e7a609 NB |
75 | static bool paste_tokens PARAMS ((cpp_reader *, const cpp_token **, |
76 | const cpp_token *)); | |
644eddaa | 77 | static void replace_args PARAMS ((cpp_reader *, cpp_hashnode *, macro_arg *)); |
d6da836d | 78 | static _cpp_buff *funlike_invocation_p PARAMS ((cpp_reader *, cpp_hashnode *)); |
93c80368 | 79 | |
93c80368 NB |
80 | /* #define directive parsing and handling. */ |
81 | ||
14baae01 | 82 | static cpp_token *alloc_expansion_token PARAMS ((cpp_reader *, cpp_macro *)); |
93c80368 | 83 | static cpp_token *lex_expansion_token PARAMS ((cpp_reader *, cpp_macro *)); |
4d6baafa | 84 | static int warn_of_redefinition PARAMS ((const cpp_hashnode *, |
618cdda7 | 85 | const cpp_macro *)); |
93c80368 NB |
86 | static int save_parameter PARAMS ((cpp_reader *, cpp_macro *, cpp_hashnode *)); |
87 | static int parse_params PARAMS ((cpp_reader *, cpp_macro *)); | |
e1aa5140 | 88 | static void check_trad_stringification PARAMS ((cpp_reader *, |
93c80368 | 89 | const cpp_macro *, |
e1aa5140 | 90 | const cpp_string *)); |
711b8824 | 91 | |
4ed5bcfb NB |
92 | /* Allocates and returns a CPP_STRING token, containing TEXT of length |
93 | LEN, after null-terminating it. TEXT must be in permanent storage. */ | |
94 | static const cpp_token * | |
95 | new_string_token (pfile, text, len) | |
96 | cpp_reader *pfile; | |
97 | unsigned char *text; | |
93c80368 NB |
98 | unsigned int len; |
99 | { | |
4ed5bcfb | 100 | cpp_token *token = _cpp_temp_token (pfile); |
93c80368 | 101 | |
4ed5bcfb | 102 | text[len] = '\0'; |
93c80368 | 103 | token->type = CPP_STRING; |
4ed5bcfb NB |
104 | token->val.str.len = len; |
105 | token->val.str.text = text; | |
93c80368 | 106 | token->flags = 0; |
4ed5bcfb | 107 | return token; |
93c80368 NB |
108 | } |
109 | ||
4ed5bcfb NB |
110 | /* Allocates and returns a CPP_NUMBER token evaluating to NUMBER. */ |
111 | static const cpp_token * | |
112 | new_number_token (pfile, number) | |
93c80368 | 113 | cpp_reader *pfile; |
d15a58c0 | 114 | unsigned int number; |
93c80368 | 115 | { |
4ed5bcfb | 116 | cpp_token *token = _cpp_temp_token (pfile); |
d15a58c0 NB |
117 | /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ |
118 | unsigned char *buf = _cpp_unaligned_alloc (pfile, 21); | |
93c80368 | 119 | |
d15a58c0 | 120 | sprintf ((char *) buf, "%u", number); |
93c80368 NB |
121 | token->type = CPP_NUMBER; |
122 | token->val.str.text = buf; | |
123 | token->val.str.len = ustrlen (buf); | |
124 | token->flags = 0; | |
4ed5bcfb | 125 | return token; |
93c80368 NB |
126 | } |
127 | ||
128 | static const char * const monthnames[] = | |
129 | { | |
130 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
131 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | |
132 | }; | |
133 | ||
644eddaa NB |
134 | /* Handle builtin macros like __FILE__, and push the resulting token |
135 | on the context stack. Also handles _Pragma, for which no new token | |
d15a58c0 NB |
136 | is created. Returns 1 if it generates a new token context, 0 to |
137 | return the token to the caller. */ | |
644eddaa | 138 | static int |
4ed5bcfb | 139 | builtin_macro (pfile, node) |
93c80368 | 140 | cpp_reader *pfile; |
4ed5bcfb | 141 | cpp_hashnode *node; |
93c80368 | 142 | { |
644eddaa NB |
143 | const cpp_token *result; |
144 | ||
93c80368 NB |
145 | switch (node->value.builtin) |
146 | { | |
4ed5bcfb | 147 | default: |
b0287a90 | 148 | cpp_ice (pfile, "invalid built-in macro \"%s\"", NODE_NAME (node)); |
644eddaa | 149 | return 0; |
4ed5bcfb | 150 | |
93c80368 NB |
151 | case BT_FILE: |
152 | case BT_BASE_FILE: | |
711b8824 | 153 | { |
4ed5bcfb | 154 | unsigned int len; |
0bda4760 | 155 | const char *name; |
4ed5bcfb | 156 | U_CHAR *buf; |
bb74c963 | 157 | const struct line_map *map = pfile->map; |
0bda4760 NB |
158 | |
159 | if (node->value.builtin == BT_BASE_FILE) | |
bb74c963 NB |
160 | while (! MAIN_FILE_P (map)) |
161 | map = INCLUDED_FROM (&pfile->line_maps, map); | |
0bda4760 | 162 | |
bb74c963 | 163 | name = map->to_file; |
4ed5bcfb | 164 | len = strlen (name); |
ece54d54 | 165 | buf = _cpp_unaligned_alloc (pfile, len * 4 + 1); |
4ed5bcfb NB |
166 | len = quote_string (buf, (const unsigned char *) name, len) - buf; |
167 | ||
644eddaa | 168 | result = new_string_token (pfile, buf, len); |
711b8824 | 169 | } |
644eddaa NB |
170 | break; |
171 | ||
93c80368 | 172 | case BT_INCLUDE_LEVEL: |
d8693c6f NB |
173 | /* The line map depth counts the primary source as level 1, but |
174 | historically __INCLUDE_DEPTH__ has called the primary source | |
175 | level 0. */ | |
644eddaa NB |
176 | result = new_number_token (pfile, pfile->line_maps.depth - 1); |
177 | break; | |
93c80368 NB |
178 | |
179 | case BT_SPECLINE: | |
180 | /* If __LINE__ is embedded in a macro, it must expand to the | |
181 | line of the macro's invocation, not its definition. | |
182 | Otherwise things like assert() will not work properly. */ | |
644eddaa NB |
183 | result = new_number_token (pfile, |
184 | SOURCE_LINE (pfile->map, | |
185 | pfile->cur_token[-1].line)); | |
186 | break; | |
93c80368 NB |
187 | |
188 | case BT_STDC: | |
189 | { | |
618cdda7 NB |
190 | int stdc = (!CPP_IN_SYSTEM_HEADER (pfile) |
191 | || pfile->spec_nodes.n__STRICT_ANSI__->type != NT_VOID); | |
644eddaa | 192 | result = new_number_token (pfile, stdc); |
93c80368 | 193 | } |
644eddaa | 194 | break; |
711b8824 | 195 | |
93c80368 NB |
196 | case BT_DATE: |
197 | case BT_TIME: | |
198 | if (pfile->date.type == CPP_EOF) | |
199 | { | |
4ed5bcfb NB |
200 | /* Allocate __DATE__ and __TIME__ strings from permanent |
201 | storage. We only do this once, and don't generate them | |
202 | at init time, because time() and localtime() are very | |
203 | slow on some systems. */ | |
93c80368 NB |
204 | time_t tt = time (NULL); |
205 | struct tm *tb = localtime (&tt); | |
206 | ||
4ed5bcfb | 207 | pfile->date.val.str.text = |
ece54d54 | 208 | _cpp_unaligned_alloc (pfile, sizeof ("Oct 11 1347")); |
4ed5bcfb NB |
209 | pfile->date.val.str.len = sizeof ("Oct 11 1347") - 1; |
210 | pfile->date.type = CPP_STRING; | |
211 | pfile->date.flags = 0; | |
93c80368 NB |
212 | sprintf ((char *) pfile->date.val.str.text, "%s %2d %4d", |
213 | monthnames[tb->tm_mon], tb->tm_mday, tb->tm_year + 1900); | |
4ed5bcfb NB |
214 | |
215 | pfile->time.val.str.text = | |
ece54d54 | 216 | _cpp_unaligned_alloc (pfile, sizeof ("12:34:56")); |
4ed5bcfb NB |
217 | pfile->time.val.str.len = sizeof ("12:34:56") - 1; |
218 | pfile->time.type = CPP_STRING; | |
219 | pfile->time.flags = 0; | |
93c80368 NB |
220 | sprintf ((char *) pfile->time.val.str.text, "%02d:%02d:%02d", |
221 | tb->tm_hour, tb->tm_min, tb->tm_sec); | |
222 | } | |
93c80368 | 223 | |
644eddaa NB |
224 | if (node->value.builtin == BT_DATE) |
225 | result = &pfile->date; | |
226 | else | |
227 | result = &pfile->time; | |
228 | break; | |
229 | ||
230 | case BT_PRAGMA: | |
231 | /* Don't interpret _Pragma within directives. The standard is | |
232 | not clear on this, but to me this makes most sense. */ | |
233 | if (pfile->state.in_directive) | |
234 | return 0; | |
235 | ||
236 | _cpp_do__Pragma (pfile); | |
237 | return 1; | |
93c80368 | 238 | } |
644eddaa NB |
239 | |
240 | push_token_context (pfile, NULL, result, 1); | |
241 | return 1; | |
711b8824 ZW |
242 | } |
243 | ||
d15a58c0 NB |
244 | /* Copies SRC, of length LEN, to DEST, adding backslashes before all |
245 | backslashes and double quotes. Non-printable characters are | |
246 | converted to octal. DEST must be of sufficient size. */ | |
93c80368 NB |
247 | static U_CHAR * |
248 | quote_string (dest, src, len) | |
249 | U_CHAR *dest; | |
250 | const U_CHAR *src; | |
251 | unsigned int len; | |
252 | { | |
253 | while (len--) | |
254 | { | |
255 | U_CHAR c = *src++; | |
711b8824 | 256 | |
93c80368 NB |
257 | if (c == '\\' || c == '"') |
258 | { | |
259 | *dest++ = '\\'; | |
260 | *dest++ = c; | |
261 | } | |
262 | else | |
263 | { | |
264 | if (ISPRINT (c)) | |
265 | *dest++ = c; | |
266 | else | |
711b8824 | 267 | { |
93c80368 NB |
268 | sprintf ((char *) dest, "\\%03o", c); |
269 | dest += 4; | |
711b8824 | 270 | } |
93c80368 NB |
271 | } |
272 | } | |
711b8824 | 273 | |
93c80368 NB |
274 | return dest; |
275 | } | |
711b8824 | 276 | |
d15a58c0 NB |
277 | /* Convert a token sequence ARG to a single string token according to |
278 | the rules of the ISO C #-operator. */ | |
4ed5bcfb | 279 | static const cpp_token * |
93c80368 NB |
280 | stringify_arg (pfile, arg) |
281 | cpp_reader *pfile; | |
282 | macro_arg *arg; | |
283 | { | |
ece54d54 NB |
284 | unsigned char *dest = BUFF_FRONT (pfile->u_buff); |
285 | unsigned int i, escape_it, backslash_count = 0; | |
4ed5bcfb | 286 | const cpp_token *source = NULL; |
ece54d54 | 287 | size_t len; |
711b8824 | 288 | |
93c80368 NB |
289 | /* Loop, reading in the argument's tokens. */ |
290 | for (i = 0; i < arg->count; i++) | |
291 | { | |
4ed5bcfb | 292 | const cpp_token *token = arg->first[i]; |
4ed5bcfb NB |
293 | |
294 | if (token->type == CPP_PADDING) | |
295 | { | |
296 | if (source == NULL) | |
297 | source = token->val.source; | |
298 | continue; | |
299 | } | |
711b8824 | 300 | |
93c80368 | 301 | escape_it = (token->type == CPP_STRING || token->type == CPP_WSTRING |
cc937581 | 302 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); |
711b8824 | 303 | |
ece54d54 NB |
304 | /* Room for each char being written in octal, initial space and |
305 | final NUL. */ | |
4ed5bcfb | 306 | len = cpp_token_len (token); |
93c80368 | 307 | if (escape_it) |
93c80368 | 308 | len *= 4; |
ece54d54 | 309 | len += 2; |
711b8824 | 310 | |
ece54d54 | 311 | if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) |
93c80368 | 312 | { |
ece54d54 | 313 | size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); |
8c3b2693 | 314 | _cpp_extend_buff (pfile, &pfile->u_buff, len); |
ece54d54 | 315 | dest = BUFF_FRONT (pfile->u_buff) + len_so_far; |
93c80368 | 316 | } |
711b8824 | 317 | |
4ed5bcfb | 318 | /* Leading white space? */ |
ece54d54 | 319 | if (dest != BUFF_FRONT (pfile->u_buff)) |
4ed5bcfb NB |
320 | { |
321 | if (source == NULL) | |
322 | source = token; | |
323 | if (source->flags & PREV_WHITE) | |
324 | *dest++ = ' '; | |
325 | } | |
326 | source = NULL; | |
711b8824 | 327 | |
93c80368 NB |
328 | if (escape_it) |
329 | { | |
ece54d54 NB |
330 | _cpp_buff *buff = _cpp_get_buff (pfile, len); |
331 | unsigned char *buf = BUFF_FRONT (buff); | |
93c80368 NB |
332 | len = cpp_spell_token (pfile, token, buf) - buf; |
333 | dest = quote_string (dest, buf, len); | |
ece54d54 | 334 | _cpp_release_buff (pfile, buff); |
93c80368 NB |
335 | } |
336 | else | |
337 | dest = cpp_spell_token (pfile, token, dest); | |
93c80368 | 338 | |
6c53ebff | 339 | if (token->type == CPP_OTHER && token->val.c == '\\') |
93c80368 NB |
340 | backslash_count++; |
341 | else | |
342 | backslash_count = 0; | |
343 | } | |
344 | ||
345 | /* Ignore the final \ of invalid string literals. */ | |
346 | if (backslash_count & 1) | |
347 | { | |
348 | cpp_warning (pfile, "invalid string literal, ignoring final '\\'"); | |
ece54d54 | 349 | dest--; |
93c80368 NB |
350 | } |
351 | ||
4ed5bcfb | 352 | /* Commit the memory, including NUL, and return the token. */ |
ece54d54 NB |
353 | len = dest - BUFF_FRONT (pfile->u_buff); |
354 | BUFF_FRONT (pfile->u_buff) = dest + 1; | |
355 | return new_string_token (pfile, dest - len, len); | |
93c80368 NB |
356 | } |
357 | ||
c9e7a609 NB |
358 | /* Try to paste two tokens. On success, return non-zero. In any |
359 | case, PLHS is updated to point to the pasted token, which is | |
360 | guaranteed to not have the PASTE_LEFT flag set. */ | |
361 | static bool | |
362 | paste_tokens (pfile, plhs, rhs) | |
d63eefbf | 363 | cpp_reader *pfile; |
c9e7a609 | 364 | const cpp_token **plhs, *rhs; |
d63eefbf | 365 | { |
c9e7a609 NB |
366 | unsigned char *buf, *end; |
367 | const cpp_token *lhs; | |
368 | unsigned int len; | |
369 | bool valid; | |
370 | ||
371 | lhs = *plhs; | |
372 | len = cpp_token_len (lhs) + cpp_token_len (rhs) + 1; | |
373 | buf = (unsigned char *) alloca (len); | |
374 | end = cpp_spell_token (pfile, lhs, buf); | |
375 | ||
376 | /* Avoid comment headers, since they are still processed in stage 3. | |
377 | It is simpler to insert a space here, rather than modifying the | |
378 | lexer to ignore comments in some circumstances. Simply returning | |
379 | false doesn't work, since we want to clear the PASTE_LEFT flag. */ | |
380 | if (lhs->type == CPP_DIV | |
381 | && (rhs->type == CPP_MULT || rhs->type == CPP_DIV)) | |
382 | *end++ = ' '; | |
383 | end = cpp_spell_token (pfile, rhs, end); | |
4d6baafa | 384 | *end = '\0'; |
c9e7a609 NB |
385 | |
386 | cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true, 1); | |
387 | ||
388 | /* Tweak the column number the lexer will report. */ | |
389 | pfile->buffer->col_adjust = pfile->cur_token[-1].col - 1; | |
390 | ||
391 | /* We don't want a leading # to be interpreted as a directive. */ | |
392 | pfile->buffer->saved_flags = 0; | |
393 | ||
394 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
395 | pfile->cur_token = _cpp_temp_token (pfile); | |
396 | *plhs = _cpp_lex_direct (pfile); | |
480709cc | 397 | valid = pfile->buffer->cur == pfile->buffer->rlimit; |
c9e7a609 NB |
398 | _cpp_pop_buffer (pfile); |
399 | ||
400 | return valid; | |
d63eefbf NB |
401 | } |
402 | ||
d15a58c0 NB |
403 | /* Handles an arbitrarily long sequence of ## operators, with initial |
404 | operand LHS. This implementation is left-associative, | |
405 | non-recursive, and finishes a paste before handling succeeding | |
406 | ones. If a paste fails, we back up to the RHS of the failing ## | |
407 | operator before pushing the context containing the result of prior | |
408 | successful pastes, with the effect that the RHS appears in the | |
409 | output stream after the pasted LHS normally. */ | |
93c80368 NB |
410 | static void |
411 | paste_all_tokens (pfile, lhs) | |
412 | cpp_reader *pfile; | |
4ed5bcfb | 413 | const cpp_token *lhs; |
93c80368 | 414 | { |
4ed5bcfb NB |
415 | const cpp_token *rhs; |
416 | cpp_context *context = pfile->context; | |
417 | ||
93c80368 NB |
418 | do |
419 | { | |
420 | /* Take the token directly from the current context. We can do | |
421 | this, because we are in the replacement list of either an | |
422 | object-like macro, or a function-like macro with arguments | |
423 | inserted. In either case, the constraints to #define | |
d63eefbf | 424 | guarantee we have at least one more token. */ |
4ed5bcfb NB |
425 | if (context->direct_p) |
426 | rhs = context->first.token++; | |
427 | else | |
428 | rhs = *context->first.ptoken++; | |
429 | ||
430 | if (rhs->type == CPP_PADDING) | |
431 | abort (); | |
432 | ||
c9e7a609 | 433 | if (!paste_tokens (pfile, &lhs, rhs)) |
93c80368 | 434 | { |
4ed5bcfb | 435 | _cpp_backup_tokens (pfile, 1); |
c9e7a609 NB |
436 | |
437 | /* Mandatory warning for all apart from assembler. */ | |
438 | if (CPP_OPTION (pfile, lang) != CLK_ASM) | |
439 | cpp_warning (pfile, | |
440 | "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", | |
441 | cpp_token_as_text (pfile, lhs), | |
442 | cpp_token_as_text (pfile, rhs)); | |
4c2b647d | 443 | break; |
93c80368 | 444 | } |
93c80368 NB |
445 | } |
446 | while (rhs->flags & PASTE_LEFT); | |
447 | ||
c9e7a609 NB |
448 | /* Put the resulting token in its own context. */ |
449 | push_token_context (pfile, NULL, lhs, 1); | |
93c80368 NB |
450 | } |
451 | ||
d15a58c0 NB |
452 | /* Reads and returns the arguments to a function-like macro |
453 | invocation. Assumes the opening parenthesis has been processed. | |
454 | If there is an error, emits an appropriate diagnostic and returns | |
455 | NULL. Each argument is terminated by a CPP_EOF token, for the | |
456 | future benefit of expand_arg(). */ | |
b8af0ca5 NB |
457 | static _cpp_buff * |
458 | collect_args (pfile, node) | |
93c80368 | 459 | cpp_reader *pfile; |
b8af0ca5 | 460 | const cpp_hashnode *node; |
93c80368 | 461 | { |
b8af0ca5 NB |
462 | _cpp_buff *buff, *base_buff; |
463 | cpp_macro *macro; | |
464 | macro_arg *args, *arg; | |
465 | const cpp_token *token; | |
466 | unsigned int argc; | |
467 | bool error = false; | |
468 | ||
469 | macro = node->value.macro; | |
470 | if (macro->paramc) | |
471 | argc = macro->paramc; | |
472 | else | |
473 | argc = 1; | |
474 | buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) | |
475 | + sizeof (macro_arg))); | |
476 | base_buff = buff; | |
477 | args = (macro_arg *) buff->base; | |
478 | memset (args, 0, argc * sizeof (macro_arg)); | |
ece54d54 | 479 | buff->cur = (unsigned char *) &args[argc]; |
b8af0ca5 NB |
480 | arg = args, argc = 0; |
481 | ||
482 | /* Collect the tokens making up each argument. We don't yet know | |
483 | how many arguments have been supplied, whether too many or too | |
484 | few. Hence the slightly bizarre usage of "argc" and "arg". */ | |
485 | do | |
93c80368 | 486 | { |
b8af0ca5 NB |
487 | unsigned int paren_depth = 0; |
488 | unsigned int ntokens = 0; | |
93c80368 | 489 | |
b8af0ca5 NB |
490 | argc++; |
491 | arg->first = (const cpp_token **) buff->cur; | |
711b8824 | 492 | |
b8af0ca5 NB |
493 | for (;;) |
494 | { | |
495 | /* Require space for 2 new tokens (including a CPP_EOF). */ | |
ece54d54 | 496 | if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) |
b8af0ca5 | 497 | { |
8c3b2693 NB |
498 | buff = _cpp_append_extend_buff (pfile, buff, |
499 | 1000 * sizeof (cpp_token *)); | |
b8af0ca5 NB |
500 | arg->first = (const cpp_token **) buff->cur; |
501 | } | |
4ed5bcfb | 502 | |
b8af0ca5 | 503 | token = cpp_get_token (pfile); |
711b8824 | 504 | |
b8af0ca5 NB |
505 | if (token->type == CPP_PADDING) |
506 | { | |
507 | /* Drop leading padding. */ | |
508 | if (ntokens == 0) | |
509 | continue; | |
510 | } | |
511 | else if (token->type == CPP_OPEN_PAREN) | |
512 | paren_depth++; | |
513 | else if (token->type == CPP_CLOSE_PAREN) | |
514 | { | |
515 | if (paren_depth-- == 0) | |
516 | break; | |
517 | } | |
518 | else if (token->type == CPP_COMMA) | |
519 | { | |
520 | /* A comma does not terminate an argument within | |
521 | parentheses or as part of a variable argument. */ | |
522 | if (paren_depth == 0 | |
523 | && ! (macro->variadic && argc == macro->paramc)) | |
524 | break; | |
525 | } | |
526 | else if (token->type == CPP_EOF | |
527 | || (token->type == CPP_HASH && token->flags & BOL)) | |
528 | break; | |
93c80368 | 529 | |
b8af0ca5 NB |
530 | arg->first[ntokens++] = token; |
531 | } | |
93c80368 | 532 | |
b8af0ca5 NB |
533 | /* Drop trailing padding. */ |
534 | while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) | |
535 | ntokens--; | |
93c80368 | 536 | |
b8af0ca5 NB |
537 | arg->count = ntokens; |
538 | arg->first[ntokens] = &pfile->eof; | |
93c80368 | 539 | |
b8af0ca5 NB |
540 | /* Terminate the argument. Excess arguments loop back and |
541 | overwrite the final legitimate argument, before failing. */ | |
542 | if (argc <= macro->paramc) | |
543 | { | |
ece54d54 | 544 | buff->cur = (unsigned char *) &arg->first[ntokens + 1]; |
b8af0ca5 NB |
545 | if (argc != macro->paramc) |
546 | arg++; | |
547 | } | |
93c80368 | 548 | } |
b8af0ca5 NB |
549 | while (token->type != CPP_CLOSE_PAREN |
550 | && token->type != CPP_EOF | |
551 | && token->type != CPP_HASH); | |
93c80368 | 552 | |
b8af0ca5 | 553 | if (token->type == CPP_EOF || token->type == CPP_HASH) |
93c80368 | 554 | { |
b8af0ca5 NB |
555 | bool step_back = false; |
556 | ||
557 | /* 6.10.3 paragraph 11: If there are sequences of preprocessing | |
558 | tokens within the list of arguments that would otherwise act | |
559 | as preprocessing directives, the behavior is undefined. | |
560 | ||
561 | This implementation will report a hard error, terminate the | |
562 | macro invocation, and proceed to process the directive. */ | |
563 | if (token->type == CPP_HASH) | |
564 | { | |
565 | cpp_error (pfile, | |
566 | "directives may not be used inside a macro argument"); | |
567 | step_back = true; | |
568 | } | |
569 | else | |
b8af0ca5 NB |
570 | step_back = (pfile->context->prev || pfile->state.in_directive); |
571 | ||
ece54d54 NB |
572 | /* We still need the CPP_EOF to end directives, and to end |
573 | pre-expansion of a macro argument. Step back is not | |
574 | unconditional, since we don't want to return a CPP_EOF to our | |
575 | callers at the end of an -include-d file. */ | |
b8af0ca5 NB |
576 | if (step_back) |
577 | _cpp_backup_tokens (pfile, 1); | |
93c80368 | 578 | cpp_error (pfile, "unterminated argument list invoking macro \"%s\"", |
a28c5035 | 579 | NODE_NAME (node)); |
b8af0ca5 | 580 | error = true; |
93c80368 NB |
581 | } |
582 | else if (argc < macro->paramc) | |
583 | { | |
584 | /* As an extension, a rest argument is allowed to not appear in | |
585 | the invocation at all. | |
586 | e.g. #define debug(format, args...) something | |
587 | debug("string"); | |
588 | ||
589 | This is exactly the same as if there had been an empty rest | |
590 | argument - debug("string", ). */ | |
591 | ||
28e0f040 | 592 | if (argc + 1 == macro->paramc && macro->variadic) |
93c80368 | 593 | { |
7065e130 | 594 | if (CPP_PEDANTIC (pfile) && ! macro->syshdr) |
93c80368 NB |
595 | cpp_pedwarn (pfile, "ISO C99 requires rest arguments to be used"); |
596 | } | |
597 | else | |
598 | { | |
599 | cpp_error (pfile, | |
600 | "macro \"%s\" requires %u arguments, but only %u given", | |
a28c5035 | 601 | NODE_NAME (node), macro->paramc, argc); |
b8af0ca5 | 602 | error = true; |
93c80368 NB |
603 | } |
604 | } | |
605 | else if (argc > macro->paramc) | |
606 | { | |
4c2b647d | 607 | /* Empty argument to a macro taking no arguments is OK. */ |
b8af0ca5 | 608 | if (argc != 1 || arg->count) |
93c80368 NB |
609 | { |
610 | cpp_error (pfile, | |
611 | "macro \"%s\" passed %u arguments, but takes just %u", | |
a28c5035 | 612 | NODE_NAME (node), argc, macro->paramc); |
b8af0ca5 | 613 | error = true; |
93c80368 NB |
614 | } |
615 | } | |
616 | ||
b8af0ca5 NB |
617 | if (!error) |
618 | return base_buff; | |
93c80368 | 619 | |
b8af0ca5 NB |
620 | _cpp_release_buff (pfile, base_buff); |
621 | return NULL; | |
93c80368 NB |
622 | } |
623 | ||
d6da836d NB |
624 | /* Search for an opening parenthesis to the macro of NODE, in such a |
625 | way that, if none is found, we don't lose the information in any | |
626 | intervening padding tokens. If we find the parenthesis, collect | |
627 | the arguments and return the buffer containing them. */ | |
628 | static _cpp_buff * | |
4ed5bcfb | 629 | funlike_invocation_p (pfile, node) |
93c80368 | 630 | cpp_reader *pfile; |
644eddaa | 631 | cpp_hashnode *node; |
93c80368 | 632 | { |
d6da836d | 633 | const cpp_token *token, *padding = NULL; |
4ed5bcfb | 634 | |
d6da836d | 635 | for (;;) |
bdcbe496 | 636 | { |
d6da836d NB |
637 | token = cpp_get_token (pfile); |
638 | if (token->type != CPP_PADDING) | |
639 | break; | |
640 | if (padding == NULL | |
641 | || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) | |
642 | padding = token; | |
bdcbe496 | 643 | } |
93c80368 | 644 | |
d6da836d | 645 | if (token->type == CPP_OPEN_PAREN) |
93c80368 | 646 | { |
d6da836d NB |
647 | pfile->state.parsing_args = 2; |
648 | return collect_args (pfile, node); | |
93c80368 NB |
649 | } |
650 | ||
d6da836d NB |
651 | /* Back up. We may have skipped padding, in which case backing up |
652 | more than one token when expanding macros is in general too | |
653 | difficult. We re-insert it in its own context. */ | |
654 | _cpp_backup_tokens (pfile, 1); | |
655 | if (padding) | |
656 | push_token_context (pfile, NULL, padding, 1); | |
657 | ||
658 | return NULL; | |
93c80368 NB |
659 | } |
660 | ||
d15a58c0 NB |
661 | /* Push the context of a macro with hash entry NODE onto the context |
662 | stack. If we can successfully expand the macro, we push a context | |
663 | containing its yet-to-be-rescanned replacement list and return one. | |
664 | Otherwise, we don't push a context and return zero. */ | |
711b8824 | 665 | static int |
29b10746 | 666 | enter_macro_context (pfile, node) |
711b8824 | 667 | cpp_reader *pfile; |
29b10746 | 668 | cpp_hashnode *node; |
711b8824 | 669 | { |
d15a58c0 | 670 | /* The presence of a macro invalidates a file's controlling macro. */ |
644eddaa NB |
671 | pfile->mi_valid = false; |
672 | ||
d15a58c0 | 673 | /* Handle standard macros. */ |
644eddaa | 674 | if (! (node->flags & NODE_BUILTIN)) |
711b8824 | 675 | { |
4ed5bcfb | 676 | cpp_macro *macro = node->value.macro; |
4c2b647d | 677 | |
d6da836d NB |
678 | if (macro->fun_like) |
679 | { | |
680 | _cpp_buff *buff; | |
681 | ||
682 | pfile->state.prevent_expansion++; | |
683 | pfile->keep_tokens++; | |
684 | pfile->state.parsing_args = 1; | |
685 | buff = funlike_invocation_p (pfile, node); | |
686 | pfile->state.parsing_args = 0; | |
687 | pfile->keep_tokens--; | |
688 | pfile->state.prevent_expansion--; | |
689 | ||
690 | if (buff == NULL) | |
691 | { | |
692 | if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr) | |
693 | cpp_warning (pfile, | |
694 | "function-like macro \"%s\" must be used with arguments in traditional C", | |
695 | NODE_NAME (node)); | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | if (node->value.macro->paramc > 0) | |
701 | replace_args (pfile, node, (macro_arg *) buff->base); | |
702 | _cpp_release_buff (pfile, buff); | |
703 | } | |
93c80368 | 704 | |
4ed5bcfb | 705 | /* Disable the macro within its expansion. */ |
644eddaa | 706 | node->flags |= NODE_DISABLED; |
93c80368 | 707 | |
4ed5bcfb | 708 | if (macro->paramc == 0) |
644eddaa NB |
709 | push_token_context (pfile, node, macro->expansion, macro->count); |
710 | ||
711 | return 1; | |
711b8824 | 712 | } |
644eddaa | 713 | |
d15a58c0 | 714 | /* Handle built-in macros and the _Pragma operator. */ |
644eddaa | 715 | return builtin_macro (pfile, node); |
93c80368 NB |
716 | } |
717 | ||
d15a58c0 NB |
718 | /* Replace the parameters in a function-like macro of NODE with the |
719 | actual ARGS, and place the result in a newly pushed token context. | |
720 | Expand each argument before replacing, unless it is operated upon | |
721 | by the # or ## operators. */ | |
93c80368 | 722 | static void |
644eddaa | 723 | replace_args (pfile, node, args) |
93c80368 | 724 | cpp_reader *pfile; |
644eddaa | 725 | cpp_hashnode *node; |
93c80368 | 726 | macro_arg *args; |
93c80368 NB |
727 | { |
728 | unsigned int i, total; | |
729 | const cpp_token *src, *limit; | |
4ed5bcfb | 730 | const cpp_token **dest, **first; |
93c80368 | 731 | macro_arg *arg; |
1e013d2e | 732 | _cpp_buff *buff; |
644eddaa | 733 | cpp_macro *macro; |
93c80368 | 734 | |
93c80368 | 735 | /* First, fully macro-expand arguments, calculating the number of |
1e013d2e NB |
736 | tokens in the final expansion as we go. The ordering of the if |
737 | statements below is subtle; we must handle stringification before | |
738 | pasting. */ | |
644eddaa | 739 | macro = node->value.macro; |
4ed5bcfb NB |
740 | total = macro->count; |
741 | limit = macro->expansion + macro->count; | |
742 | ||
743 | for (src = macro->expansion; src < limit; src++) | |
93c80368 NB |
744 | if (src->type == CPP_MACRO_ARG) |
745 | { | |
4ed5bcfb NB |
746 | /* Leading and trailing padding tokens. */ |
747 | total += 2; | |
748 | ||
93c80368 NB |
749 | /* We have an argument. If it is not being stringified or |
750 | pasted it is macro-replaced before insertion. */ | |
6c53ebff | 751 | arg = &args[src->val.arg_no - 1]; |
4c2b647d | 752 | |
93c80368 NB |
753 | if (src->flags & STRINGIFY_ARG) |
754 | { | |
755 | if (!arg->stringified) | |
4ed5bcfb | 756 | arg->stringified = stringify_arg (pfile, arg); |
93c80368 NB |
757 | } |
758 | else if ((src->flags & PASTE_LEFT) | |
759 | || (src > macro->expansion && (src[-1].flags & PASTE_LEFT))) | |
760 | total += arg->count - 1; | |
761 | else | |
762 | { | |
763 | if (!arg->expanded) | |
4ed5bcfb | 764 | expand_arg (pfile, arg); |
93c80368 NB |
765 | total += arg->expanded_count - 1; |
766 | } | |
767 | } | |
768 | ||
4ed5bcfb NB |
769 | /* Now allocate space for the expansion, copy the tokens and replace |
770 | the arguments. */ | |
1e013d2e NB |
771 | buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); |
772 | first = (const cpp_token **) buff->base; | |
4ed5bcfb | 773 | dest = first; |
93c80368 NB |
774 | |
775 | for (src = macro->expansion; src < limit; src++) | |
4ed5bcfb NB |
776 | { |
777 | unsigned int count; | |
778 | const cpp_token **from, **paste_flag; | |
93c80368 | 779 | |
4ed5bcfb NB |
780 | if (src->type != CPP_MACRO_ARG) |
781 | { | |
782 | *dest++ = src; | |
783 | continue; | |
784 | } | |
93c80368 | 785 | |
4ed5bcfb NB |
786 | paste_flag = 0; |
787 | arg = &args[src->val.arg_no - 1]; | |
788 | if (src->flags & STRINGIFY_ARG) | |
789 | count = 1, from = &arg->stringified; | |
790 | else if (src->flags & PASTE_LEFT) | |
791 | count = arg->count, from = arg->first; | |
792 | else if (src != macro->expansion && (src[-1].flags & PASTE_LEFT)) | |
793 | { | |
794 | count = arg->count, from = arg->first; | |
795 | if (dest != first) | |
796 | { | |
797 | /* GCC has special semantics for , ## b where b is a | |
798 | varargs parameter: the comma disappears if b was | |
799 | given no actual arguments (not merely if b is an | |
800 | empty argument); otherwise the paste flag is removed. */ | |
801 | if (dest[-1]->type == CPP_COMMA | |
802 | && macro->variadic | |
803 | && src->val.arg_no == macro->paramc) | |
804 | { | |
805 | if (count == 0) | |
806 | dest--; | |
807 | else | |
808 | paste_flag = dest - 1; | |
809 | } | |
810 | /* Remove the paste flag if the RHS is a placemarker. */ | |
811 | else if (count == 0) | |
812 | paste_flag = dest - 1; | |
813 | } | |
814 | } | |
815 | else | |
816 | count = arg->expanded_count, from = arg->expanded; | |
4c2b647d | 817 | |
4ed5bcfb NB |
818 | /* Padding on the left of an argument (unless RHS of ##). */ |
819 | if (!pfile->state.in_directive | |
820 | && src != macro->expansion && !(src[-1].flags & PASTE_LEFT)) | |
821 | *dest++ = padding_token (pfile, src); | |
93c80368 | 822 | |
4ed5bcfb NB |
823 | if (count) |
824 | { | |
825 | memcpy (dest, from, count * sizeof (cpp_token *)); | |
826 | dest += count; | |
93c80368 | 827 | |
4ed5bcfb NB |
828 | /* With a non-empty argument on the LHS of ##, the last |
829 | token should be flagged PASTE_LEFT. */ | |
830 | if (src->flags & PASTE_LEFT) | |
831 | paste_flag = dest - 1; | |
832 | } | |
26ec42ee | 833 | |
4ed5bcfb NB |
834 | /* Avoid paste on RHS (even case count == 0). */ |
835 | if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) | |
836 | *dest++ = &pfile->avoid_paste; | |
93c80368 | 837 | |
4ed5bcfb NB |
838 | /* Add a new paste flag, or remove an unwanted one. */ |
839 | if (paste_flag) | |
840 | { | |
841 | cpp_token *token = _cpp_temp_token (pfile); | |
842 | token->type = (*paste_flag)->type; | |
843 | token->val.str = (*paste_flag)->val.str; | |
844 | if (src->flags & PASTE_LEFT) | |
845 | token->flags = (*paste_flag)->flags | PASTE_LEFT; | |
846 | else | |
847 | token->flags = (*paste_flag)->flags & ~PASTE_LEFT; | |
848 | *paste_flag = token; | |
849 | } | |
850 | } | |
4c2b647d | 851 | |
93c80368 NB |
852 | /* Free the expanded arguments. */ |
853 | for (i = 0; i < macro->paramc; i++) | |
4ed5bcfb NB |
854 | if (args[i].expanded) |
855 | free (args[i].expanded); | |
856 | ||
644eddaa | 857 | push_ptoken_context (pfile, node, buff, first, dest - first); |
4ed5bcfb NB |
858 | } |
859 | ||
860 | /* Return a special padding token, with padding inherited from SOURCE. */ | |
861 | static const cpp_token * | |
862 | padding_token (pfile, source) | |
863 | cpp_reader *pfile; | |
864 | const cpp_token *source; | |
865 | { | |
866 | cpp_token *result = _cpp_temp_token (pfile); | |
867 | ||
868 | result->type = CPP_PADDING; | |
869 | result->val.source = source; | |
870 | result->flags = 0; | |
871 | return result; | |
872 | } | |
873 | ||
d15a58c0 NB |
874 | /* Get a new uninitialized context. Create a new one if we cannot |
875 | re-use an old one. */ | |
4ed5bcfb NB |
876 | static cpp_context * |
877 | next_context (pfile) | |
878 | cpp_reader *pfile; | |
879 | { | |
880 | cpp_context *result = pfile->context->next; | |
881 | ||
882 | if (result == 0) | |
711b8824 | 883 | { |
4ed5bcfb NB |
884 | result = xnew (cpp_context); |
885 | result->prev = pfile->context; | |
886 | result->next = 0; | |
887 | pfile->context->next = result; | |
93c80368 | 888 | } |
4ed5bcfb NB |
889 | |
890 | pfile->context = result; | |
891 | return result; | |
93c80368 NB |
892 | } |
893 | ||
4ed5bcfb NB |
894 | /* Push a list of pointers to tokens. */ |
895 | static void | |
1e013d2e | 896 | push_ptoken_context (pfile, macro, buff, first, count) |
93c80368 | 897 | cpp_reader *pfile; |
644eddaa | 898 | cpp_hashnode *macro; |
1e013d2e | 899 | _cpp_buff *buff; |
4ed5bcfb NB |
900 | const cpp_token **first; |
901 | unsigned int count; | |
93c80368 NB |
902 | { |
903 | cpp_context *context = next_context (pfile); | |
93c80368 | 904 | |
4ed5bcfb NB |
905 | context->direct_p = false; |
906 | context->macro = macro; | |
1e013d2e | 907 | context->buff = buff; |
4ed5bcfb NB |
908 | context->first.ptoken = first; |
909 | context->last.ptoken = first + count; | |
910 | } | |
911 | ||
912 | /* Push a list of tokens. */ | |
913 | static void | |
914 | push_token_context (pfile, macro, first, count) | |
915 | cpp_reader *pfile; | |
644eddaa | 916 | cpp_hashnode *macro; |
4ed5bcfb NB |
917 | const cpp_token *first; |
918 | unsigned int count; | |
919 | { | |
920 | cpp_context *context = next_context (pfile); | |
921 | ||
922 | context->direct_p = true; | |
923 | context->macro = macro; | |
1e013d2e | 924 | context->buff = NULL; |
4ed5bcfb NB |
925 | context->first.token = first; |
926 | context->last.token = first + count; | |
93c80368 NB |
927 | } |
928 | ||
d15a58c0 NB |
929 | /* Expand an argument ARG before replacing parameters in a |
930 | function-like macro. This works by pushing a context with the | |
931 | argument's tokens, and then expanding that into a temporary buffer | |
932 | as if it were a normal part of the token stream. collect_args() | |
933 | has terminated the argument's tokens with a CPP_EOF so that we know | |
934 | when we have fully expanded the argument. */ | |
93c80368 NB |
935 | static void |
936 | expand_arg (pfile, arg) | |
937 | cpp_reader *pfile; | |
938 | macro_arg *arg; | |
939 | { | |
4ed5bcfb NB |
940 | unsigned int capacity; |
941 | ||
4ed5bcfb NB |
942 | if (arg->count == 0) |
943 | return; | |
93c80368 NB |
944 | |
945 | /* Loop, reading in the arguments. */ | |
4ed5bcfb NB |
946 | capacity = 256; |
947 | arg->expanded = (const cpp_token **) | |
948 | xmalloc (capacity * sizeof (cpp_token *)); | |
93c80368 | 949 | |
1e013d2e | 950 | push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); |
4ed5bcfb | 951 | for (;;) |
93c80368 | 952 | { |
4ed5bcfb NB |
953 | const cpp_token *token; |
954 | ||
955 | if (arg->expanded_count + 1 >= capacity) | |
711b8824 | 956 | { |
93c80368 | 957 | capacity *= 2; |
4ed5bcfb NB |
958 | arg->expanded = (const cpp_token **) |
959 | xrealloc (arg->expanded, capacity * sizeof (cpp_token *)); | |
93c80368 | 960 | } |
93c80368 | 961 | |
4ed5bcfb | 962 | token = cpp_get_token (pfile); |
93c80368 | 963 | |
4ed5bcfb NB |
964 | if (token->type == CPP_EOF) |
965 | break; | |
966 | ||
967 | arg->expanded[arg->expanded_count++] = token; | |
968 | } | |
969 | ||
1e013d2e | 970 | _cpp_pop_context (pfile); |
93c80368 NB |
971 | } |
972 | ||
d15a58c0 NB |
973 | /* Pop the current context off the stack, re-enabling the macro if the |
974 | context represented a macro's replacement list. The context | |
975 | structure is not freed so that we can re-use it later. */ | |
93c80368 NB |
976 | void |
977 | _cpp_pop_context (pfile) | |
978 | cpp_reader *pfile; | |
979 | { | |
1e013d2e NB |
980 | cpp_context *context = pfile->context; |
981 | ||
1e013d2e | 982 | if (context->macro) |
644eddaa | 983 | context->macro->flags &= ~NODE_DISABLED; |
1e013d2e NB |
984 | |
985 | if (context->buff) | |
986 | _cpp_release_buff (pfile, context->buff); | |
93c80368 | 987 | |
1e013d2e | 988 | pfile->context = context->prev; |
93c80368 NB |
989 | } |
990 | ||
7f2f1a66 NB |
991 | /* Eternal routine to get a token. Also used nearly everywhere |
992 | internally, except for places where we know we can safely call | |
993 | the lexer directly, such as lexing a directive name. | |
994 | ||
995 | Macro expansions and directives are transparently handled, | |
996 | including entering included files. Thus tokens are post-macro | |
997 | expansion, and after any intervening directives. External callers | |
998 | see CPP_EOF only at EOF. Internal callers also see it when meeting | |
999 | a directive inside a macro call, when at the end of a directive and | |
1000 | state.in_directive is still 1, and at the end of argument | |
1001 | pre-expansion. */ | |
4ed5bcfb NB |
1002 | const cpp_token * |
1003 | cpp_get_token (pfile) | |
93c80368 | 1004 | cpp_reader *pfile; |
93c80368 | 1005 | { |
4ed5bcfb NB |
1006 | const cpp_token *result; |
1007 | ||
29b10746 | 1008 | for (;;) |
93c80368 | 1009 | { |
4ed5bcfb | 1010 | cpp_hashnode *node; |
93c80368 NB |
1011 | cpp_context *context = pfile->context; |
1012 | ||
93c80368 | 1013 | /* Context->prev == 0 <=> base context. */ |
bdcbe496 | 1014 | if (!context->prev) |
4ed5bcfb NB |
1015 | result = _cpp_lex_token (pfile); |
1016 | else if (context->first.token != context->last.token) | |
29b10746 | 1017 | { |
4ed5bcfb NB |
1018 | if (context->direct_p) |
1019 | result = context->first.token++; | |
1020 | else | |
1021 | result = *context->first.ptoken++; | |
1022 | ||
1023 | if (result->flags & PASTE_LEFT) | |
ec1a23e6 | 1024 | { |
4ed5bcfb NB |
1025 | paste_all_tokens (pfile, result); |
1026 | if (pfile->state.in_directive) | |
1027 | continue; | |
1028 | return padding_token (pfile, result); | |
ec1a23e6 | 1029 | } |
29b10746 | 1030 | } |
93c80368 NB |
1031 | else |
1032 | { | |
bdcbe496 | 1033 | _cpp_pop_context (pfile); |
4ed5bcfb NB |
1034 | if (pfile->state.in_directive) |
1035 | continue; | |
1036 | return &pfile->avoid_paste; | |
93c80368 | 1037 | } |
93c80368 | 1038 | |
4ed5bcfb | 1039 | if (result->type != CPP_NAME) |
93c80368 NB |
1040 | break; |
1041 | ||
4ed5bcfb NB |
1042 | node = result->val.node; |
1043 | ||
644eddaa NB |
1044 | if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) |
1045 | break; | |
1046 | ||
1047 | if (!(node->flags & NODE_DISABLED)) | |
93c80368 | 1048 | { |
644eddaa NB |
1049 | if (!pfile->state.prevent_expansion |
1050 | && enter_macro_context (pfile, node)) | |
bd969772 | 1051 | { |
4ed5bcfb NB |
1052 | if (pfile->state.in_directive) |
1053 | continue; | |
1054 | return padding_token (pfile, result); | |
bd969772 | 1055 | } |
93c80368 | 1056 | } |
644eddaa NB |
1057 | else |
1058 | { | |
d15a58c0 NB |
1059 | /* Flag this token as always unexpandable. FIXME: move this |
1060 | to collect_args()?. */ | |
644eddaa NB |
1061 | cpp_token *t = _cpp_temp_token (pfile); |
1062 | t->type = result->type; | |
1063 | t->flags = result->flags | NO_EXPAND; | |
1064 | t->val.str = result->val.str; | |
1065 | result = t; | |
1066 | } | |
a5c3cccd | 1067 | |
644eddaa | 1068 | break; |
93c80368 | 1069 | } |
4ed5bcfb NB |
1070 | |
1071 | return result; | |
93c80368 NB |
1072 | } |
1073 | ||
7065e130 NB |
1074 | /* Returns true if we're expanding an object-like macro that was |
1075 | defined in a system header. Just checks the macro at the top of | |
1076 | the stack. Used for diagnostic suppression. */ | |
1077 | int | |
c691145a | 1078 | cpp_sys_macro_p (pfile) |
7065e130 NB |
1079 | cpp_reader *pfile; |
1080 | { | |
644eddaa | 1081 | cpp_hashnode *node = pfile->context->macro; |
7065e130 | 1082 | |
644eddaa | 1083 | return node && node->value.macro && node->value.macro->syshdr; |
7065e130 NB |
1084 | } |
1085 | ||
93c80368 NB |
1086 | /* Read each token in, until EOF. Directives are transparently |
1087 | processed. */ | |
1088 | void | |
ef6e958a | 1089 | cpp_scan_nooutput (pfile) |
93c80368 NB |
1090 | cpp_reader *pfile; |
1091 | { | |
4ed5bcfb NB |
1092 | while (cpp_get_token (pfile)->type != CPP_EOF) |
1093 | ; | |
93c80368 NB |
1094 | } |
1095 | ||
bdcbe496 NB |
1096 | /* Step back one (or more) tokens. Can only step mack more than 1 if |
1097 | they are from the lexer, and not from macro expansion. */ | |
b528a07e | 1098 | void |
bdcbe496 | 1099 | _cpp_backup_tokens (pfile, count) |
93c80368 | 1100 | cpp_reader *pfile; |
bdcbe496 | 1101 | unsigned int count; |
93c80368 | 1102 | { |
bdcbe496 | 1103 | if (pfile->context->prev == NULL) |
93c80368 | 1104 | { |
bdcbe496 NB |
1105 | pfile->lookaheads += count; |
1106 | while (count--) | |
1107 | { | |
3293c3e3 NB |
1108 | pfile->cur_token--; |
1109 | if (pfile->cur_token == pfile->cur_run->base | |
1110 | /* Possible with -fpreprocessed and no leading #line. */ | |
1111 | && pfile->cur_run->prev != NULL) | |
bdcbe496 | 1112 | { |
bdcbe496 NB |
1113 | pfile->cur_run = pfile->cur_run->prev; |
1114 | pfile->cur_token = pfile->cur_run->limit; | |
1115 | } | |
1116 | } | |
93c80368 | 1117 | } |
bdcbe496 | 1118 | else |
93c80368 | 1119 | { |
bdcbe496 NB |
1120 | if (count != 1) |
1121 | abort (); | |
4ed5bcfb NB |
1122 | if (pfile->context->direct_p) |
1123 | pfile->context->first.token--; | |
1124 | else | |
1125 | pfile->context->first.ptoken--; | |
93c80368 NB |
1126 | } |
1127 | } | |
711b8824 | 1128 | |
93c80368 NB |
1129 | /* #define directive parsing and handling. */ |
1130 | ||
618cdda7 | 1131 | /* Returns non-zero if a macro redefinition warning is required. */ |
93c80368 | 1132 | static int |
4d6baafa | 1133 | warn_of_redefinition (node, macro2) |
93c80368 NB |
1134 | const cpp_hashnode *node; |
1135 | const cpp_macro *macro2; | |
1136 | { | |
1137 | const cpp_macro *macro1; | |
1138 | unsigned int i; | |
1139 | ||
618cdda7 NB |
1140 | /* Some redefinitions need to be warned about regardless. */ |
1141 | if (node->flags & NODE_WARN) | |
1142 | return 1; | |
93c80368 | 1143 | |
618cdda7 | 1144 | /* Redefinition of a macro is allowed if and only if the old and new |
ec5c56db | 1145 | definitions are the same. (6.10.3 paragraph 2). */ |
93c80368 NB |
1146 | macro1 = node->value.macro; |
1147 | ||
1148 | /* The quick failures. */ | |
1149 | if (macro1->count != macro2->count | |
1150 | || macro1->paramc != macro2->paramc | |
1151 | || macro1->fun_like != macro2->fun_like | |
28e0f040 | 1152 | || macro1->variadic != macro2->variadic) |
618cdda7 | 1153 | return 1; |
93c80368 NB |
1154 | |
1155 | /* Check each token. */ | |
1156 | for (i = 0; i < macro1->count; i++) | |
1157 | if (! _cpp_equiv_tokens (¯o1->expansion[i], ¯o2->expansion[i])) | |
618cdda7 | 1158 | return 1; |
93c80368 NB |
1159 | |
1160 | /* Check parameter spellings. */ | |
1161 | for (i = 0; i < macro1->paramc; i++) | |
1162 | if (macro1->params[i] != macro2->params[i]) | |
618cdda7 | 1163 | return 1; |
93c80368 | 1164 | |
618cdda7 | 1165 | return 0; |
93c80368 NB |
1166 | } |
1167 | ||
1168 | /* Free the definition of hashnode H. */ | |
711b8824 ZW |
1169 | void |
1170 | _cpp_free_definition (h) | |
1171 | cpp_hashnode *h; | |
1172 | { | |
93c80368 NB |
1173 | /* Macros and assertions no longer have anything to free. */ |
1174 | h->type = NT_VOID; | |
1175 | /* Clear builtin flag in case of redefinition. */ | |
644eddaa | 1176 | h->flags &= ~(NODE_BUILTIN | NODE_DISABLED); |
93c80368 NB |
1177 | } |
1178 | ||
14baae01 | 1179 | /* Save parameter NODE to the parameter list of macro MACRO. Returns |
f5143c46 | 1180 | zero on success, non-zero if the parameter is a duplicate. */ |
93c80368 NB |
1181 | static int |
1182 | save_parameter (pfile, macro, node) | |
1183 | cpp_reader *pfile; | |
1184 | cpp_macro *macro; | |
1185 | cpp_hashnode *node; | |
1186 | { | |
93c80368 NB |
1187 | /* Constraint 6.10.3.6 - duplicate parameter names. */ |
1188 | if (node->arg_index) | |
709e9e50 | 1189 | { |
a28c5035 | 1190 | cpp_error (pfile, "duplicate macro parameter \"%s\"", NODE_NAME (node)); |
93c80368 NB |
1191 | return 1; |
1192 | } | |
709e9e50 | 1193 | |
8c3b2693 NB |
1194 | if (BUFF_ROOM (pfile->a_buff) |
1195 | < (macro->paramc + 1) * sizeof (cpp_hashnode *)) | |
1196 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); | |
709e9e50 | 1197 | |
8c3b2693 NB |
1198 | ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; |
1199 | node->arg_index = macro->paramc; | |
93c80368 | 1200 | return 0; |
711b8824 ZW |
1201 | } |
1202 | ||
8c3b2693 | 1203 | /* Check the syntax of the parameters in a MACRO definition. */ |
93c80368 NB |
1204 | static int |
1205 | parse_params (pfile, macro) | |
711b8824 | 1206 | cpp_reader *pfile; |
93c80368 | 1207 | cpp_macro *macro; |
711b8824 | 1208 | { |
93c80368 | 1209 | unsigned int prev_ident = 0; |
711b8824 | 1210 | |
93c80368 | 1211 | for (;;) |
711b8824 | 1212 | { |
345894b4 | 1213 | const cpp_token *token = _cpp_lex_token (pfile); |
711b8824 | 1214 | |
345894b4 | 1215 | switch (token->type) |
711b8824 | 1216 | { |
93c80368 NB |
1217 | default: |
1218 | cpp_error (pfile, "\"%s\" may not appear in macro parameter list", | |
345894b4 | 1219 | cpp_token_as_text (pfile, token)); |
93c80368 NB |
1220 | return 0; |
1221 | ||
711b8824 | 1222 | case CPP_NAME: |
93c80368 NB |
1223 | if (prev_ident) |
1224 | { | |
1225 | cpp_error (pfile, "macro parameters must be comma-separated"); | |
1226 | return 0; | |
1227 | } | |
1228 | prev_ident = 1; | |
1229 | ||
345894b4 | 1230 | if (save_parameter (pfile, macro, token->val.node)) |
93c80368 NB |
1231 | return 0; |
1232 | continue; | |
711b8824 | 1233 | |
93c80368 NB |
1234 | case CPP_CLOSE_PAREN: |
1235 | if (prev_ident || macro->paramc == 0) | |
8c3b2693 | 1236 | return 1; |
711b8824 | 1237 | |
93c80368 NB |
1238 | /* Fall through to pick up the error. */ |
1239 | case CPP_COMMA: | |
1240 | if (!prev_ident) | |
1241 | { | |
1242 | cpp_error (pfile, "parameter name missing"); | |
1243 | return 0; | |
1244 | } | |
1245 | prev_ident = 0; | |
711b8824 ZW |
1246 | continue; |
1247 | ||
93c80368 | 1248 | case CPP_ELLIPSIS: |
28e0f040 | 1249 | macro->variadic = 1; |
93c80368 NB |
1250 | if (!prev_ident) |
1251 | { | |
1252 | save_parameter (pfile, macro, pfile->spec_nodes.n__VA_ARGS__); | |
1253 | pfile->state.va_args_ok = 1; | |
1254 | if (! CPP_OPTION (pfile, c99) && CPP_OPTION (pfile, pedantic)) | |
1255 | cpp_pedwarn (pfile, | |
28e0f040 | 1256 | "anonymous variadic macros were introduced in C99"); |
93c80368 NB |
1257 | } |
1258 | else if (CPP_OPTION (pfile, pedantic)) | |
28e0f040 | 1259 | cpp_pedwarn (pfile, "ISO C does not permit named variadic macros"); |
711b8824 | 1260 | |
93c80368 | 1261 | /* We're at the end, and just expect a closing parenthesis. */ |
345894b4 NB |
1262 | token = _cpp_lex_token (pfile); |
1263 | if (token->type == CPP_CLOSE_PAREN) | |
8c3b2693 | 1264 | return 1; |
93c80368 | 1265 | /* Fall through. */ |
711b8824 | 1266 | |
93c80368 NB |
1267 | case CPP_EOF: |
1268 | cpp_error (pfile, "missing ')' in macro parameter list"); | |
1269 | return 0; | |
711b8824 | 1270 | } |
711b8824 | 1271 | } |
93c80368 NB |
1272 | } |
1273 | ||
14baae01 | 1274 | /* Allocate room for a token from a macro's replacement list. */ |
93c80368 | 1275 | static cpp_token * |
14baae01 | 1276 | alloc_expansion_token (pfile, macro) |
93c80368 NB |
1277 | cpp_reader *pfile; |
1278 | cpp_macro *macro; | |
1279 | { | |
8c3b2693 NB |
1280 | if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) |
1281 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); | |
711b8824 | 1282 | |
8c3b2693 | 1283 | return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; |
14baae01 NB |
1284 | } |
1285 | ||
d15a58c0 NB |
1286 | /* Lex a token from the expansion of MACRO, but mark parameters as we |
1287 | find them and warn of traditional stringification. */ | |
14baae01 NB |
1288 | static cpp_token * |
1289 | lex_expansion_token (pfile, macro) | |
1290 | cpp_reader *pfile; | |
1291 | cpp_macro *macro; | |
1292 | { | |
1293 | cpp_token *token; | |
1294 | ||
1295 | pfile->cur_token = alloc_expansion_token (pfile, macro); | |
1296 | token = _cpp_lex_direct (pfile); | |
93c80368 | 1297 | |
d15a58c0 | 1298 | /* Is this a parameter? */ |
93c80368 NB |
1299 | if (token->type == CPP_NAME && token->val.node->arg_index) |
1300 | { | |
1301 | token->type = CPP_MACRO_ARG; | |
6c53ebff | 1302 | token->val.arg_no = token->val.node->arg_index; |
93c80368 NB |
1303 | } |
1304 | else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 | |
1305 | && (token->type == CPP_STRING || token->type == CPP_CHAR)) | |
1306 | check_trad_stringification (pfile, macro, &token->val.str); | |
1307 | ||
1308 | return token; | |
711b8824 ZW |
1309 | } |
1310 | ||
1311 | /* Parse a macro and save its expansion. Returns non-zero on success. */ | |
1312 | int | |
93c80368 | 1313 | _cpp_create_definition (pfile, node) |
711b8824 | 1314 | cpp_reader *pfile; |
93c80368 | 1315 | cpp_hashnode *node; |
711b8824 | 1316 | { |
93c80368 | 1317 | cpp_macro *macro; |
14baae01 NB |
1318 | cpp_token *token, *saved_cur_token; |
1319 | const cpp_token *ctoken; | |
93c80368 NB |
1320 | unsigned int i, ok = 1; |
1321 | ||
8c3b2693 | 1322 | macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); |
50410426 | 1323 | macro->line = pfile->directive_line; |
93c80368 NB |
1324 | macro->params = 0; |
1325 | macro->paramc = 0; | |
28e0f040 | 1326 | macro->variadic = 0; |
93c80368 | 1327 | macro->count = 0; |
14baae01 | 1328 | macro->fun_like = 0; |
93c80368 NB |
1329 | |
1330 | /* Get the first token of the expansion (or the '(' of a | |
1331 | function-like macro). */ | |
14baae01 NB |
1332 | ctoken = _cpp_lex_token (pfile); |
1333 | ||
1334 | if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) | |
93c80368 | 1335 | { |
8c3b2693 NB |
1336 | ok = parse_params (pfile, macro); |
1337 | macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); | |
1338 | if (!ok) | |
14baae01 | 1339 | goto cleanup2; |
8c3b2693 NB |
1340 | |
1341 | /* Success. Commit the parameter array. */ | |
1342 | BUFF_FRONT (pfile->a_buff) = (U_CHAR *) ¯o->params[macro->paramc]; | |
93c80368 | 1343 | macro->fun_like = 1; |
93c80368 | 1344 | } |
14baae01 | 1345 | else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) |
93c80368 | 1346 | cpp_pedwarn (pfile, "ISO C requires whitespace after the macro name"); |
711b8824 | 1347 | |
14baae01 | 1348 | saved_cur_token = pfile->cur_token; |
14baae01 NB |
1349 | |
1350 | if (macro->fun_like) | |
1351 | token = lex_expansion_token (pfile, macro); | |
1352 | else | |
1353 | { | |
1354 | token = alloc_expansion_token (pfile, macro); | |
1355 | *token = *ctoken; | |
1356 | } | |
711b8824 | 1357 | |
93c80368 NB |
1358 | for (;;) |
1359 | { | |
1360 | /* Check the stringifying # constraint 6.10.3.2.1 of | |
1361 | function-like macros when lexing the subsequent token. */ | |
1362 | if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) | |
1363 | { | |
1364 | if (token->type == CPP_MACRO_ARG) | |
1365 | { | |
1366 | token->flags &= ~PREV_WHITE; | |
1367 | token->flags |= STRINGIFY_ARG; | |
1368 | token->flags |= token[-1].flags & PREV_WHITE; | |
1369 | token[-1] = token[0]; | |
1370 | macro->count--; | |
1371 | } | |
1372 | /* Let assembler get away with murder. */ | |
bdb05a7b | 1373 | else if (CPP_OPTION (pfile, lang) != CLK_ASM) |
93c80368 NB |
1374 | { |
1375 | ok = 0; | |
1376 | cpp_error (pfile, "'#' is not followed by a macro parameter"); | |
14baae01 | 1377 | goto cleanup1; |
93c80368 NB |
1378 | } |
1379 | } | |
1380 | ||
1381 | if (token->type == CPP_EOF) | |
1382 | break; | |
1383 | ||
1384 | /* Paste operator constraint 6.10.3.3.1. */ | |
1385 | if (token->type == CPP_PASTE) | |
1386 | { | |
1387 | /* Token-paste ##, can appear in both object-like and | |
1388 | function-like macros, but not at the ends. */ | |
1389 | if (--macro->count > 0) | |
1390 | token = lex_expansion_token (pfile, macro); | |
1391 | ||
1392 | if (macro->count == 0 || token->type == CPP_EOF) | |
1393 | { | |
1394 | ok = 0; | |
1395 | cpp_error (pfile, | |
1396 | "'##' cannot appear at either end of a macro expansion"); | |
14baae01 | 1397 | goto cleanup1; |
93c80368 | 1398 | } |
711b8824 | 1399 | |
93c80368 | 1400 | token[-1].flags |= PASTE_LEFT; |
93c80368 NB |
1401 | } |
1402 | ||
1403 | token = lex_expansion_token (pfile, macro); | |
1404 | } | |
1405 | ||
8c3b2693 NB |
1406 | macro->expansion = (cpp_token *) BUFF_FRONT (pfile->a_buff); |
1407 | ||
4c2b647d NB |
1408 | /* Don't count the CPP_EOF. */ |
1409 | macro->count--; | |
93c80368 | 1410 | |
d15a58c0 | 1411 | /* Clear whitespace on first token for warn_of_redefinition(). */ |
8c3b2693 NB |
1412 | if (macro->count) |
1413 | macro->expansion[0].flags &= ~PREV_WHITE; | |
1414 | ||
1415 | /* Commit the memory. */ | |
1416 | BUFF_FRONT (pfile->a_buff) = (U_CHAR *) ¯o->expansion[macro->count]; | |
1417 | ||
44ed91a1 | 1418 | /* Implement the macro-defined-to-itself optimisation. */ |
644eddaa NB |
1419 | if (macro->count == 1 && !macro->fun_like |
1420 | && macro->expansion[0].type == CPP_NAME | |
1421 | && macro->expansion[0].val.node == node) | |
1422 | node->flags |= NODE_DISABLED; | |
44ed91a1 | 1423 | |
7065e130 | 1424 | /* To suppress some diagnostics. */ |
47d89cf3 | 1425 | macro->syshdr = pfile->map->sysp != 0; |
7065e130 | 1426 | |
93c80368 | 1427 | if (node->type != NT_VOID) |
711b8824 | 1428 | { |
4d6baafa | 1429 | if (warn_of_redefinition (node, macro)) |
711b8824 | 1430 | { |
50410426 | 1431 | cpp_pedwarn_with_line (pfile, pfile->directive_line, 0, |
a28c5035 | 1432 | "\"%s\" redefined", NODE_NAME (node)); |
93c80368 | 1433 | |
618cdda7 | 1434 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) |
14baae01 | 1435 | cpp_pedwarn_with_line (pfile, node->value.macro->line, 0, |
711b8824 ZW |
1436 | "this is the location of the previous definition"); |
1437 | } | |
93c80368 | 1438 | _cpp_free_definition (node); |
711b8824 ZW |
1439 | } |
1440 | ||
1441 | /* Enter definition in hash table. */ | |
93c80368 NB |
1442 | node->type = NT_MACRO; |
1443 | node->value.macro = macro; | |
a28c5035 | 1444 | if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_"))) |
618cdda7 | 1445 | node->flags |= NODE_WARN; |
711b8824 | 1446 | |
14baae01 NB |
1447 | cleanup1: |
1448 | ||
1449 | /* Set type for SEEN_EOL() in cpplib.c, restore the lexer position. */ | |
1450 | saved_cur_token[-1].type = pfile->cur_token[-1].type; | |
1451 | pfile->cur_token = saved_cur_token; | |
1452 | ||
1453 | cleanup2: | |
93c80368 NB |
1454 | |
1455 | /* Stop the lexer accepting __VA_ARGS__. */ | |
1456 | pfile->state.va_args_ok = 0; | |
1457 | ||
1458 | /* Clear the fast argument lookup indices. */ | |
1459 | for (i = macro->paramc; i-- > 0; ) | |
1460 | macro->params[i]->arg_index = 0; | |
1461 | ||
1462 | return ok; | |
711b8824 ZW |
1463 | } |
1464 | ||
d15a58c0 NB |
1465 | /* Warn if a token in STRING matches one of a function-like MACRO's |
1466 | parameters. */ | |
e1aa5140 | 1467 | static void |
93c80368 | 1468 | check_trad_stringification (pfile, macro, string) |
e1aa5140 | 1469 | cpp_reader *pfile; |
93c80368 | 1470 | const cpp_macro *macro; |
e1aa5140 KG |
1471 | const cpp_string *string; |
1472 | { | |
93c80368 | 1473 | unsigned int i, len; |
e1aa5140 KG |
1474 | const U_CHAR *p, *q, *limit = string->text + string->len; |
1475 | ||
1476 | /* Loop over the string. */ | |
1477 | for (p = string->text; p < limit; p = q) | |
1478 | { | |
e1aa5140 | 1479 | /* Find the start of an identifier. */ |
61c16b10 GM |
1480 | while (p < limit && !is_idstart (*p)) |
1481 | p++; | |
e1aa5140 KG |
1482 | |
1483 | /* Find the end of the identifier. */ | |
1484 | q = p; | |
61c16b10 GM |
1485 | while (q < limit && is_idchar (*q)) |
1486 | q++; | |
93c80368 NB |
1487 | |
1488 | len = q - p; | |
1489 | ||
e1aa5140 KG |
1490 | /* Loop over the function macro arguments to see if the |
1491 | identifier inside the string matches one of them. */ | |
93c80368 NB |
1492 | for (i = 0; i < macro->paramc; i++) |
1493 | { | |
1494 | const cpp_hashnode *node = macro->params[i]; | |
e1aa5140 | 1495 | |
2a967f3d NB |
1496 | if (NODE_LEN (node) == len |
1497 | && !memcmp (p, NODE_NAME (node), len)) | |
e1aa5140 KG |
1498 | { |
1499 | cpp_warning (pfile, | |
357351e5 | 1500 | "macro argument \"%s\" would be stringified with -traditional", |
a28c5035 | 1501 | NODE_NAME (node)); |
e1aa5140 KG |
1502 | break; |
1503 | } | |
1504 | } | |
1505 | } | |
1506 | } | |
93c80368 | 1507 | |
7096171b NB |
1508 | /* Returns the name, arguments and expansion of a macro, in a format |
1509 | suitable to be read back in again, and therefore also for DWARF 2 | |
1510 | debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". | |
1511 | Caller is expected to generate the "#define" bit if needed. The | |
93c80368 | 1512 | returned text is temporary, and automatically freed later. */ |
93c80368 NB |
1513 | const unsigned char * |
1514 | cpp_macro_definition (pfile, node) | |
1515 | cpp_reader *pfile; | |
1516 | const cpp_hashnode *node; | |
1517 | { | |
1518 | unsigned int i, len; | |
1519 | const cpp_macro *macro = node->value.macro; | |
1520 | unsigned char *buffer; | |
1521 | ||
1522 | if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) | |
1523 | { | |
7096171b | 1524 | cpp_ice (pfile, "invalid hash type %d in cpp_macro_definition", node->type); |
93c80368 NB |
1525 | return 0; |
1526 | } | |
1527 | ||
1528 | /* Calculate length. */ | |
7096171b | 1529 | len = NODE_LEN (node) + 1; /* ' ' */ |
93c80368 NB |
1530 | if (macro->fun_like) |
1531 | { | |
7096171b NB |
1532 | len += 3; /* "()" plus possible final "." of named |
1533 | varargs (we have + 2 below). */ | |
93c80368 | 1534 | for (i = 0; i < macro->paramc; i++) |
a28c5035 | 1535 | len += NODE_LEN (macro->params[i]) + 2; /* ", " */ |
93c80368 NB |
1536 | } |
1537 | ||
4c2b647d | 1538 | for (i = 0; i < macro->count; i++) |
93c80368 | 1539 | { |
4c2b647d | 1540 | cpp_token *token = ¯o->expansion[i]; |
93c80368 | 1541 | |
4c2b647d | 1542 | if (token->type == CPP_MACRO_ARG) |
a28c5035 | 1543 | len += NODE_LEN (macro->params[token->val.arg_no - 1]); |
4c2b647d NB |
1544 | else |
1545 | len += cpp_token_len (token); /* Includes room for ' '. */ | |
1546 | if (token->flags & STRINGIFY_ARG) | |
1547 | len++; /* "#" */ | |
1548 | if (token->flags & PASTE_LEFT) | |
1549 | len += 3; /* " ##" */ | |
93c80368 NB |
1550 | } |
1551 | ||
1552 | if (len > pfile->macro_buffer_len) | |
4b49c365 AO |
1553 | { |
1554 | pfile->macro_buffer = (U_CHAR *) xrealloc (pfile->macro_buffer, len); | |
1555 | pfile->macro_buffer_len = len; | |
1556 | } | |
7096171b NB |
1557 | |
1558 | /* Fill in the buffer. Start with the macro name. */ | |
93c80368 | 1559 | buffer = pfile->macro_buffer; |
7096171b NB |
1560 | memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); |
1561 | buffer += NODE_LEN (node); | |
93c80368 NB |
1562 | |
1563 | /* Parameter names. */ | |
1564 | if (macro->fun_like) | |
1565 | { | |
1566 | *buffer++ = '('; | |
1567 | for (i = 0; i < macro->paramc; i++) | |
1568 | { | |
1569 | cpp_hashnode *param = macro->params[i]; | |
1570 | ||
1571 | if (param != pfile->spec_nodes.n__VA_ARGS__) | |
1572 | { | |
a28c5035 NB |
1573 | memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); |
1574 | buffer += NODE_LEN (param); | |
93c80368 NB |
1575 | } |
1576 | ||
1577 | if (i + 1 < macro->paramc) | |
1578 | *buffer++ = ',', *buffer++ = ' '; | |
28e0f040 | 1579 | else if (macro->variadic) |
93c80368 NB |
1580 | *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; |
1581 | } | |
1582 | *buffer++ = ')'; | |
1583 | } | |
1584 | ||
1585 | /* Expansion tokens. */ | |
4c2b647d | 1586 | if (macro->count) |
93c80368 NB |
1587 | { |
1588 | *buffer++ = ' '; | |
1589 | for (i = 0; i < macro->count; i++) | |
1590 | { | |
1591 | cpp_token *token = ¯o->expansion[i]; | |
1592 | ||
1593 | if (token->flags & PREV_WHITE) | |
1594 | *buffer++ = ' '; | |
1595 | if (token->flags & STRINGIFY_ARG) | |
1596 | *buffer++ = '#'; | |
1597 | ||
1598 | if (token->type == CPP_MACRO_ARG) | |
1599 | { | |
a28c5035 NB |
1600 | len = NODE_LEN (macro->params[token->val.arg_no - 1]); |
1601 | memcpy (buffer, | |
1602 | NODE_NAME (macro->params[token->val.arg_no - 1]), len); | |
93c80368 NB |
1603 | buffer += len; |
1604 | } | |
1605 | else | |
1606 | buffer = cpp_spell_token (pfile, token, buffer); | |
1607 | ||
1608 | if (token->flags & PASTE_LEFT) | |
1609 | { | |
1610 | *buffer++ = ' '; | |
1611 | *buffer++ = '#'; | |
1612 | *buffer++ = '#'; | |
1613 | /* Next has PREV_WHITE; see _cpp_create_definition. */ | |
1614 | } | |
1615 | } | |
1616 | } | |
1617 | ||
1618 | *buffer = '\0'; | |
1619 | return pfile->macro_buffer; | |
1620 | } |