Mercurial > hg > CbC > CbC_gcc
annotate libcpp/macro.c @ 63:b7f97abdc517 gcc-4.6-20100522
update gcc from gcc-4.5.0 to gcc-4.6
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
---|---|
date | Mon, 24 May 2010 12:47:05 +0900 |
parents | 77e2b8dfacca |
children | f6334be47118 |
rev | line source |
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0 | 1 /* Part of CPP library. (Macro and #define handling.) |
2 Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998, | |
3 1999, 2000, 2001, 2002, 2003, 2004, 2005, | |
4 2006, 2007, 2008, 2009 Free Software Foundation, Inc. | |
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 3, 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; see the file COPYING3. If not see | |
21 <http://www.gnu.org/licenses/>. | |
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" | |
30 #include "internal.h" | |
31 | |
32 typedef struct macro_arg macro_arg; | |
33 struct macro_arg | |
34 { | |
35 const cpp_token **first; /* First token in unexpanded argument. */ | |
36 const cpp_token **expanded; /* Macro-expanded argument. */ | |
37 const cpp_token *stringified; /* Stringified argument. */ | |
38 unsigned int count; /* # of tokens in argument. */ | |
39 unsigned int expanded_count; /* # of tokens in expanded argument. */ | |
40 }; | |
41 | |
42 /* Macro expansion. */ | |
43 | |
44 static int enter_macro_context (cpp_reader *, cpp_hashnode *, | |
45 const cpp_token *); | |
46 static int builtin_macro (cpp_reader *, cpp_hashnode *); | |
47 static void push_ptoken_context (cpp_reader *, cpp_hashnode *, _cpp_buff *, | |
48 const cpp_token **, unsigned int); | |
49 static _cpp_buff *collect_args (cpp_reader *, const cpp_hashnode *, | |
50 _cpp_buff **); | |
51 static cpp_context *next_context (cpp_reader *); | |
52 static const cpp_token *padding_token (cpp_reader *, const cpp_token *); | |
53 static void expand_arg (cpp_reader *, macro_arg *); | |
54 static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int); | |
55 static const cpp_token *stringify_arg (cpp_reader *, macro_arg *); | |
56 static void paste_all_tokens (cpp_reader *, const cpp_token *); | |
57 static bool paste_tokens (cpp_reader *, const cpp_token **, const cpp_token *); | |
58 static void replace_args (cpp_reader *, cpp_hashnode *, cpp_macro *, | |
59 macro_arg *); | |
60 static _cpp_buff *funlike_invocation_p (cpp_reader *, cpp_hashnode *, | |
61 _cpp_buff **); | |
62 static bool create_iso_definition (cpp_reader *, cpp_macro *); | |
63 | |
64 /* #define directive parsing and handling. */ | |
65 | |
66 static cpp_token *alloc_expansion_token (cpp_reader *, cpp_macro *); | |
67 static cpp_token *lex_expansion_token (cpp_reader *, cpp_macro *); | |
68 static bool warn_of_redefinition (cpp_reader *, const cpp_hashnode *, | |
69 const cpp_macro *); | |
70 static bool parse_params (cpp_reader *, cpp_macro *); | |
71 static void check_trad_stringification (cpp_reader *, const cpp_macro *, | |
72 const cpp_string *); | |
73 | |
74 /* Emits a warning if NODE is a macro defined in the main file that | |
75 has not been used. */ | |
76 int | |
77 _cpp_warn_if_unused_macro (cpp_reader *pfile, cpp_hashnode *node, | |
78 void *v ATTRIBUTE_UNUSED) | |
79 { | |
80 if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) | |
81 { | |
82 cpp_macro *macro = node->value.macro; | |
83 | |
84 if (!macro->used | |
85 && MAIN_FILE_P (linemap_lookup (pfile->line_table, macro->line))) | |
63
b7f97abdc517
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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86 cpp_warning_with_line (pfile, CPP_W_UNUSED_MACROS, macro->line, 0, |
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parents:
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87 "macro \"%s\" is not used", NODE_NAME (node)); |
0 | 88 } |
89 | |
90 return 1; | |
91 } | |
92 | |
93 /* Allocates and returns a CPP_STRING token, containing TEXT of length | |
94 LEN, after null-terminating it. TEXT must be in permanent storage. */ | |
95 static const cpp_token * | |
96 new_string_token (cpp_reader *pfile, unsigned char *text, unsigned int len) | |
97 { | |
98 cpp_token *token = _cpp_temp_token (pfile); | |
99 | |
100 text[len] = '\0'; | |
101 token->type = CPP_STRING; | |
102 token->val.str.len = len; | |
103 token->val.str.text = text; | |
104 token->flags = 0; | |
105 return token; | |
106 } | |
107 | |
108 static const char * const monthnames[] = | |
109 { | |
110 "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
111 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | |
112 }; | |
113 | |
114 /* Helper function for builtin_macro. Returns the text generated by | |
115 a builtin macro. */ | |
116 const uchar * | |
117 _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node) | |
118 { | |
119 const struct line_map *map; | |
120 const uchar *result = NULL; | |
121 linenum_type number = 1; | |
122 | |
123 switch (node->value.builtin) | |
124 { | |
125 default: | |
126 cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", | |
127 NODE_NAME (node)); | |
128 break; | |
129 | |
130 case BT_TIMESTAMP: | |
131 { | |
132 cpp_buffer *pbuffer = cpp_get_buffer (pfile); | |
133 if (pbuffer->timestamp == NULL) | |
134 { | |
135 /* Initialize timestamp value of the assotiated file. */ | |
136 struct _cpp_file *file = cpp_get_file (pbuffer); | |
137 if (file) | |
138 { | |
139 /* Generate __TIMESTAMP__ string, that represents | |
140 the date and time of the last modification | |
141 of the current source file. The string constant | |
142 looks like "Sun Sep 16 01:03:52 1973". */ | |
143 struct tm *tb = NULL; | |
144 struct stat *st = _cpp_get_file_stat (file); | |
145 if (st) | |
146 tb = localtime (&st->st_mtime); | |
147 if (tb) | |
148 { | |
149 char *str = asctime (tb); | |
150 size_t len = strlen (str); | |
151 unsigned char *buf = _cpp_unaligned_alloc (pfile, len + 2); | |
152 buf[0] = '"'; | |
153 strcpy ((char *) buf + 1, str); | |
154 buf[len] = '"'; | |
155 pbuffer->timestamp = buf; | |
156 } | |
157 else | |
158 { | |
159 cpp_errno (pfile, CPP_DL_WARNING, | |
160 "could not determine file timestamp"); | |
161 pbuffer->timestamp = UC"\"??? ??? ?? ??:??:?? ????\""; | |
162 } | |
163 } | |
164 } | |
165 result = pbuffer->timestamp; | |
166 } | |
167 break; | |
168 case BT_FILE: | |
169 case BT_BASE_FILE: | |
170 { | |
171 unsigned int len; | |
172 const char *name; | |
173 uchar *buf; | |
174 map = linemap_lookup (pfile->line_table, pfile->line_table->highest_line); | |
175 | |
176 if (node->value.builtin == BT_BASE_FILE) | |
177 while (! MAIN_FILE_P (map)) | |
178 map = INCLUDED_FROM (pfile->line_table, map); | |
179 | |
180 name = map->to_file; | |
181 len = strlen (name); | |
182 buf = _cpp_unaligned_alloc (pfile, len * 2 + 3); | |
183 result = buf; | |
184 *buf = '"'; | |
185 buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len); | |
186 *buf++ = '"'; | |
187 *buf = '\0'; | |
188 } | |
189 break; | |
190 | |
191 case BT_INCLUDE_LEVEL: | |
192 /* The line map depth counts the primary source as level 1, but | |
193 historically __INCLUDE_DEPTH__ has called the primary source | |
194 level 0. */ | |
195 number = pfile->line_table->depth - 1; | |
196 break; | |
197 | |
198 case BT_SPECLINE: | |
199 map = &pfile->line_table->maps[pfile->line_table->used-1]; | |
200 /* If __LINE__ is embedded in a macro, it must expand to the | |
201 line of the macro's invocation, not its definition. | |
202 Otherwise things like assert() will not work properly. */ | |
203 number = SOURCE_LINE (map, | |
204 CPP_OPTION (pfile, traditional) | |
205 ? pfile->line_table->highest_line | |
206 : pfile->cur_token[-1].src_loc); | |
207 break; | |
208 | |
209 /* __STDC__ has the value 1 under normal circumstances. | |
210 However, if (a) we are in a system header, (b) the option | |
211 stdc_0_in_system_headers is true (set by target config), and | |
212 (c) we are not in strictly conforming mode, then it has the | |
213 value 0. (b) and (c) are already checked in cpp_init_builtins. */ | |
214 case BT_STDC: | |
215 if (cpp_in_system_header (pfile)) | |
216 number = 0; | |
217 else | |
218 number = 1; | |
219 break; | |
220 | |
221 case BT_DATE: | |
222 case BT_TIME: | |
223 if (pfile->date == NULL) | |
224 { | |
225 /* Allocate __DATE__ and __TIME__ strings from permanent | |
226 storage. We only do this once, and don't generate them | |
227 at init time, because time() and localtime() are very | |
228 slow on some systems. */ | |
229 time_t tt; | |
230 struct tm *tb = NULL; | |
231 | |
232 /* (time_t) -1 is a legitimate value for "number of seconds | |
233 since the Epoch", so we have to do a little dance to | |
234 distinguish that from a genuine error. */ | |
235 errno = 0; | |
236 tt = time(NULL); | |
237 if (tt != (time_t)-1 || errno == 0) | |
238 tb = localtime (&tt); | |
239 | |
240 if (tb) | |
241 { | |
242 pfile->date = _cpp_unaligned_alloc (pfile, | |
243 sizeof ("\"Oct 11 1347\"")); | |
244 sprintf ((char *) pfile->date, "\"%s %2d %4d\"", | |
245 monthnames[tb->tm_mon], tb->tm_mday, | |
246 tb->tm_year + 1900); | |
247 | |
248 pfile->time = _cpp_unaligned_alloc (pfile, | |
249 sizeof ("\"12:34:56\"")); | |
250 sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", | |
251 tb->tm_hour, tb->tm_min, tb->tm_sec); | |
252 } | |
253 else | |
254 { | |
255 cpp_errno (pfile, CPP_DL_WARNING, | |
256 "could not determine date and time"); | |
257 | |
258 pfile->date = UC"\"??? ?? ????\""; | |
259 pfile->time = UC"\"??:??:??\""; | |
260 } | |
261 } | |
262 | |
263 if (node->value.builtin == BT_DATE) | |
264 result = pfile->date; | |
265 else | |
266 result = pfile->time; | |
267 break; | |
268 | |
269 case BT_COUNTER: | |
270 if (CPP_OPTION (pfile, directives_only) && pfile->state.in_directive) | |
271 cpp_error (pfile, CPP_DL_ERROR, | |
272 "__COUNTER__ expanded inside directive with -fdirectives-only"); | |
273 number = pfile->counter++; | |
274 break; | |
275 } | |
276 | |
277 if (result == NULL) | |
278 { | |
279 /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ | |
280 result = _cpp_unaligned_alloc (pfile, 21); | |
281 sprintf ((char *) result, "%u", number); | |
282 } | |
283 | |
284 return result; | |
285 } | |
286 | |
287 /* Convert builtin macros like __FILE__ to a token and push it on the | |
288 context stack. Also handles _Pragma, for which a new token may not | |
289 be created. Returns 1 if it generates a new token context, 0 to | |
290 return the token to the caller. */ | |
291 static int | |
292 builtin_macro (cpp_reader *pfile, cpp_hashnode *node) | |
293 { | |
294 const uchar *buf; | |
295 size_t len; | |
296 char *nbuf; | |
297 | |
298 if (node->value.builtin == BT_PRAGMA) | |
299 { | |
300 /* Don't interpret _Pragma within directives. The standard is | |
301 not clear on this, but to me this makes most sense. */ | |
302 if (pfile->state.in_directive) | |
303 return 0; | |
304 | |
305 return _cpp_do__Pragma (pfile); | |
306 } | |
307 | |
308 buf = _cpp_builtin_macro_text (pfile, node); | |
309 len = ustrlen (buf); | |
310 nbuf = (char *) alloca (len + 1); | |
311 memcpy (nbuf, buf, len); | |
312 nbuf[len]='\n'; | |
313 | |
314 cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true); | |
315 _cpp_clean_line (pfile); | |
316 | |
317 /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
318 pfile->cur_token = _cpp_temp_token (pfile); | |
319 _cpp_push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1); | |
320 if (pfile->buffer->cur != pfile->buffer->rlimit) | |
321 cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", | |
322 NODE_NAME (node)); | |
323 _cpp_pop_buffer (pfile); | |
324 | |
325 return 1; | |
326 } | |
327 | |
328 /* Copies SRC, of length LEN, to DEST, adding backslashes before all | |
329 backslashes and double quotes. DEST must be of sufficient size. | |
330 Returns a pointer to the end of the string. */ | |
331 uchar * | |
332 cpp_quote_string (uchar *dest, const uchar *src, unsigned int len) | |
333 { | |
334 while (len--) | |
335 { | |
336 uchar c = *src++; | |
337 | |
338 if (c == '\\' || c == '"') | |
339 { | |
340 *dest++ = '\\'; | |
341 *dest++ = c; | |
342 } | |
343 else | |
344 *dest++ = c; | |
345 } | |
346 | |
347 return dest; | |
348 } | |
349 | |
350 /* Convert a token sequence ARG to a single string token according to | |
351 the rules of the ISO C #-operator. */ | |
352 static const cpp_token * | |
353 stringify_arg (cpp_reader *pfile, macro_arg *arg) | |
354 { | |
355 unsigned char *dest; | |
356 unsigned int i, escape_it, backslash_count = 0; | |
357 const cpp_token *source = NULL; | |
358 size_t len; | |
359 | |
360 if (BUFF_ROOM (pfile->u_buff) < 3) | |
361 _cpp_extend_buff (pfile, &pfile->u_buff, 3); | |
362 dest = BUFF_FRONT (pfile->u_buff); | |
363 *dest++ = '"'; | |
364 | |
365 /* Loop, reading in the argument's tokens. */ | |
366 for (i = 0; i < arg->count; i++) | |
367 { | |
368 const cpp_token *token = arg->first[i]; | |
369 | |
370 if (token->type == CPP_PADDING) | |
371 { | |
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77e2b8dfacca
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parents:
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372 if (source == NULL |
77e2b8dfacca
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parents:
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373 || (!(source->flags & PREV_WHITE) |
77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
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374 && token->val.source == NULL)) |
0 | 375 source = token->val.source; |
376 continue; | |
377 } | |
378 | |
379 escape_it = (token->type == CPP_STRING || token->type == CPP_CHAR | |
36 | 380 || token->type == CPP_WSTRING || token->type == CPP_WCHAR |
0 | 381 || token->type == CPP_STRING32 || token->type == CPP_CHAR32 |
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382 || token->type == CPP_STRING16 || token->type == CPP_CHAR16 |
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383 || token->type == CPP_UTF8STRING); |
0 | 384 |
385 /* Room for each char being written in octal, initial space and | |
386 final quote and NUL. */ | |
387 len = cpp_token_len (token); | |
388 if (escape_it) | |
389 len *= 4; | |
390 len += 3; | |
391 | |
392 if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) | |
393 { | |
394 size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); | |
395 _cpp_extend_buff (pfile, &pfile->u_buff, len); | |
396 dest = BUFF_FRONT (pfile->u_buff) + len_so_far; | |
397 } | |
398 | |
399 /* Leading white space? */ | |
400 if (dest - 1 != BUFF_FRONT (pfile->u_buff)) | |
401 { | |
402 if (source == NULL) | |
403 source = token; | |
404 if (source->flags & PREV_WHITE) | |
405 *dest++ = ' '; | |
406 } | |
407 source = NULL; | |
408 | |
409 if (escape_it) | |
410 { | |
411 _cpp_buff *buff = _cpp_get_buff (pfile, len); | |
412 unsigned char *buf = BUFF_FRONT (buff); | |
413 len = cpp_spell_token (pfile, token, buf, true) - buf; | |
414 dest = cpp_quote_string (dest, buf, len); | |
415 _cpp_release_buff (pfile, buff); | |
416 } | |
417 else | |
418 dest = cpp_spell_token (pfile, token, dest, true); | |
419 | |
420 if (token->type == CPP_OTHER && token->val.str.text[0] == '\\') | |
421 backslash_count++; | |
422 else | |
423 backslash_count = 0; | |
424 } | |
425 | |
426 /* Ignore the final \ of invalid string literals. */ | |
427 if (backslash_count & 1) | |
428 { | |
429 cpp_error (pfile, CPP_DL_WARNING, | |
430 "invalid string literal, ignoring final '\\'"); | |
431 dest--; | |
432 } | |
433 | |
434 /* Commit the memory, including NUL, and return the token. */ | |
435 *dest++ = '"'; | |
436 len = dest - BUFF_FRONT (pfile->u_buff); | |
437 BUFF_FRONT (pfile->u_buff) = dest + 1; | |
438 return new_string_token (pfile, dest - len, len); | |
439 } | |
440 | |
441 /* Try to paste two tokens. On success, return nonzero. In any | |
442 case, PLHS is updated to point to the pasted token, which is | |
443 guaranteed to not have the PASTE_LEFT flag set. */ | |
444 static bool | |
445 paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs) | |
446 { | |
447 unsigned char *buf, *end, *lhsend; | |
448 cpp_token *lhs; | |
449 unsigned int len; | |
450 | |
451 len = cpp_token_len (*plhs) + cpp_token_len (rhs) + 1; | |
452 buf = (unsigned char *) alloca (len); | |
453 end = lhsend = cpp_spell_token (pfile, *plhs, buf, false); | |
454 | |
455 /* Avoid comment headers, since they are still processed in stage 3. | |
456 It is simpler to insert a space here, rather than modifying the | |
457 lexer to ignore comments in some circumstances. Simply returning | |
458 false doesn't work, since we want to clear the PASTE_LEFT flag. */ | |
459 if ((*plhs)->type == CPP_DIV && rhs->type != CPP_EQ) | |
460 *end++ = ' '; | |
461 /* In one obscure case we might see padding here. */ | |
462 if (rhs->type != CPP_PADDING) | |
463 end = cpp_spell_token (pfile, rhs, end, false); | |
464 *end = '\n'; | |
465 | |
466 cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true); | |
467 _cpp_clean_line (pfile); | |
468 | |
469 /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
470 pfile->cur_token = _cpp_temp_token (pfile); | |
471 lhs = _cpp_lex_direct (pfile); | |
472 if (pfile->buffer->cur != pfile->buffer->rlimit) | |
473 { | |
474 source_location saved_loc = lhs->src_loc; | |
475 | |
476 _cpp_pop_buffer (pfile); | |
477 _cpp_backup_tokens (pfile, 1); | |
478 *lhsend = '\0'; | |
479 | |
480 /* We have to remove the PASTE_LEFT flag from the old lhs, but | |
481 we want to keep the new location. */ | |
482 *lhs = **plhs; | |
483 *plhs = lhs; | |
484 lhs->src_loc = saved_loc; | |
485 lhs->flags &= ~PASTE_LEFT; | |
486 | |
487 /* Mandatory error for all apart from assembler. */ | |
488 if (CPP_OPTION (pfile, lang) != CLK_ASM) | |
489 cpp_error (pfile, CPP_DL_ERROR, | |
490 "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", | |
491 buf, cpp_token_as_text (pfile, rhs)); | |
492 return false; | |
493 } | |
494 | |
495 *plhs = lhs; | |
496 _cpp_pop_buffer (pfile); | |
497 return true; | |
498 } | |
499 | |
500 /* Handles an arbitrarily long sequence of ## operators, with initial | |
501 operand LHS. This implementation is left-associative, | |
502 non-recursive, and finishes a paste before handling succeeding | |
503 ones. If a paste fails, we back up to the RHS of the failing ## | |
504 operator before pushing the context containing the result of prior | |
505 successful pastes, with the effect that the RHS appears in the | |
506 output stream after the pasted LHS normally. */ | |
507 static void | |
508 paste_all_tokens (cpp_reader *pfile, const cpp_token *lhs) | |
509 { | |
510 const cpp_token *rhs; | |
511 cpp_context *context = pfile->context; | |
512 | |
513 do | |
514 { | |
515 /* Take the token directly from the current context. We can do | |
516 this, because we are in the replacement list of either an | |
517 object-like macro, or a function-like macro with arguments | |
518 inserted. In either case, the constraints to #define | |
519 guarantee we have at least one more token. */ | |
520 if (context->direct_p) | |
521 rhs = FIRST (context).token++; | |
522 else | |
523 rhs = *FIRST (context).ptoken++; | |
524 | |
525 if (rhs->type == CPP_PADDING) | |
526 { | |
527 if (rhs->flags & PASTE_LEFT) | |
528 abort (); | |
529 } | |
530 if (!paste_tokens (pfile, &lhs, rhs)) | |
531 break; | |
532 } | |
533 while (rhs->flags & PASTE_LEFT); | |
534 | |
535 /* Put the resulting token in its own context. */ | |
536 _cpp_push_token_context (pfile, NULL, lhs, 1); | |
537 } | |
538 | |
539 /* Returns TRUE if the number of arguments ARGC supplied in an | |
540 invocation of the MACRO referenced by NODE is valid. An empty | |
541 invocation to a macro with no parameters should pass ARGC as zero. | |
542 | |
543 Note that MACRO cannot necessarily be deduced from NODE, in case | |
544 NODE was redefined whilst collecting arguments. */ | |
545 bool | |
546 _cpp_arguments_ok (cpp_reader *pfile, cpp_macro *macro, const cpp_hashnode *node, unsigned int argc) | |
547 { | |
548 if (argc == macro->paramc) | |
549 return true; | |
550 | |
551 if (argc < macro->paramc) | |
552 { | |
553 /* As an extension, a rest argument is allowed to not appear in | |
554 the invocation at all. | |
555 e.g. #define debug(format, args...) something | |
556 debug("string"); | |
557 | |
558 This is exactly the same as if there had been an empty rest | |
559 argument - debug("string", ). */ | |
560 | |
561 if (argc + 1 == macro->paramc && macro->variadic) | |
562 { | |
563 if (CPP_PEDANTIC (pfile) && ! macro->syshdr) | |
564 cpp_error (pfile, CPP_DL_PEDWARN, | |
565 "ISO C99 requires rest arguments to be used"); | |
566 return true; | |
567 } | |
568 | |
569 cpp_error (pfile, CPP_DL_ERROR, | |
570 "macro \"%s\" requires %u arguments, but only %u given", | |
571 NODE_NAME (node), macro->paramc, argc); | |
572 } | |
573 else | |
574 cpp_error (pfile, CPP_DL_ERROR, | |
575 "macro \"%s\" passed %u arguments, but takes just %u", | |
576 NODE_NAME (node), argc, macro->paramc); | |
577 | |
578 return false; | |
579 } | |
580 | |
581 /* Reads and returns the arguments to a function-like macro | |
582 invocation. Assumes the opening parenthesis has been processed. | |
583 If there is an error, emits an appropriate diagnostic and returns | |
584 NULL. Each argument is terminated by a CPP_EOF token, for the | |
585 future benefit of expand_arg(). If there are any deferred | |
586 #pragma directives among macro arguments, store pointers to the | |
587 CPP_PRAGMA ... CPP_PRAGMA_EOL tokens into *PRAGMA_BUFF buffer. */ | |
588 static _cpp_buff * | |
589 collect_args (cpp_reader *pfile, const cpp_hashnode *node, | |
590 _cpp_buff **pragma_buff) | |
591 { | |
592 _cpp_buff *buff, *base_buff; | |
593 cpp_macro *macro; | |
594 macro_arg *args, *arg; | |
595 const cpp_token *token; | |
596 unsigned int argc; | |
597 | |
598 macro = node->value.macro; | |
599 if (macro->paramc) | |
600 argc = macro->paramc; | |
601 else | |
602 argc = 1; | |
603 buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) | |
604 + sizeof (macro_arg))); | |
605 base_buff = buff; | |
606 args = (macro_arg *) buff->base; | |
607 memset (args, 0, argc * sizeof (macro_arg)); | |
608 buff->cur = (unsigned char *) &args[argc]; | |
609 arg = args, argc = 0; | |
610 | |
611 /* Collect the tokens making up each argument. We don't yet know | |
612 how many arguments have been supplied, whether too many or too | |
613 few. Hence the slightly bizarre usage of "argc" and "arg". */ | |
614 do | |
615 { | |
616 unsigned int paren_depth = 0; | |
617 unsigned int ntokens = 0; | |
618 | |
619 argc++; | |
620 arg->first = (const cpp_token **) buff->cur; | |
621 | |
622 for (;;) | |
623 { | |
624 /* Require space for 2 new tokens (including a CPP_EOF). */ | |
625 if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) | |
626 { | |
627 buff = _cpp_append_extend_buff (pfile, buff, | |
628 1000 * sizeof (cpp_token *)); | |
629 arg->first = (const cpp_token **) buff->cur; | |
630 } | |
631 | |
632 token = cpp_get_token (pfile); | |
633 | |
634 if (token->type == CPP_PADDING) | |
635 { | |
636 /* Drop leading padding. */ | |
637 if (ntokens == 0) | |
638 continue; | |
639 } | |
640 else if (token->type == CPP_OPEN_PAREN) | |
641 paren_depth++; | |
642 else if (token->type == CPP_CLOSE_PAREN) | |
643 { | |
644 if (paren_depth-- == 0) | |
645 break; | |
646 } | |
647 else if (token->type == CPP_COMMA) | |
648 { | |
649 /* A comma does not terminate an argument within | |
650 parentheses or as part of a variable argument. */ | |
651 if (paren_depth == 0 | |
652 && ! (macro->variadic && argc == macro->paramc)) | |
653 break; | |
654 } | |
655 else if (token->type == CPP_EOF | |
656 || (token->type == CPP_HASH && token->flags & BOL)) | |
657 break; | |
658 else if (token->type == CPP_PRAGMA) | |
659 { | |
660 cpp_token *newtok = _cpp_temp_token (pfile); | |
661 | |
662 /* CPP_PRAGMA token lives in directive_result, which will | |
663 be overwritten on the next directive. */ | |
664 *newtok = *token; | |
665 token = newtok; | |
666 do | |
667 { | |
668 if (*pragma_buff == NULL | |
669 || BUFF_ROOM (*pragma_buff) < sizeof (cpp_token *)) | |
670 { | |
671 _cpp_buff *next; | |
672 if (*pragma_buff == NULL) | |
673 *pragma_buff | |
674 = _cpp_get_buff (pfile, 32 * sizeof (cpp_token *)); | |
675 else | |
676 { | |
677 next = *pragma_buff; | |
678 *pragma_buff | |
679 = _cpp_get_buff (pfile, | |
680 (BUFF_FRONT (*pragma_buff) | |
681 - (*pragma_buff)->base) * 2); | |
682 (*pragma_buff)->next = next; | |
683 } | |
684 } | |
685 *(const cpp_token **) BUFF_FRONT (*pragma_buff) = token; | |
686 BUFF_FRONT (*pragma_buff) += sizeof (cpp_token *); | |
687 if (token->type == CPP_PRAGMA_EOL) | |
688 break; | |
689 token = cpp_get_token (pfile); | |
690 } | |
691 while (token->type != CPP_EOF); | |
692 | |
693 /* In deferred pragmas parsing_args and prevent_expansion | |
694 had been changed, reset it. */ | |
695 pfile->state.parsing_args = 2; | |
696 pfile->state.prevent_expansion = 1; | |
697 | |
698 if (token->type == CPP_EOF) | |
699 break; | |
700 else | |
701 continue; | |
702 } | |
703 | |
704 arg->first[ntokens++] = token; | |
705 } | |
706 | |
707 /* Drop trailing padding. */ | |
708 while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) | |
709 ntokens--; | |
710 | |
711 arg->count = ntokens; | |
712 arg->first[ntokens] = &pfile->eof; | |
713 | |
714 /* Terminate the argument. Excess arguments loop back and | |
715 overwrite the final legitimate argument, before failing. */ | |
716 if (argc <= macro->paramc) | |
717 { | |
718 buff->cur = (unsigned char *) &arg->first[ntokens + 1]; | |
719 if (argc != macro->paramc) | |
720 arg++; | |
721 } | |
722 } | |
723 while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); | |
724 | |
725 if (token->type == CPP_EOF) | |
726 { | |
727 /* We still need the CPP_EOF to end directives, and to end | |
728 pre-expansion of a macro argument. Step back is not | |
729 unconditional, since we don't want to return a CPP_EOF to our | |
730 callers at the end of an -include-d file. */ | |
731 if (pfile->context->prev || pfile->state.in_directive) | |
732 _cpp_backup_tokens (pfile, 1); | |
733 cpp_error (pfile, CPP_DL_ERROR, | |
734 "unterminated argument list invoking macro \"%s\"", | |
735 NODE_NAME (node)); | |
736 } | |
737 else | |
738 { | |
739 /* A single empty argument is counted as no argument. */ | |
740 if (argc == 1 && macro->paramc == 0 && args[0].count == 0) | |
741 argc = 0; | |
742 if (_cpp_arguments_ok (pfile, macro, node, argc)) | |
743 { | |
744 /* GCC has special semantics for , ## b where b is a varargs | |
745 parameter: we remove the comma if b was omitted entirely. | |
746 If b was merely an empty argument, the comma is retained. | |
747 If the macro takes just one (varargs) parameter, then we | |
748 retain the comma only if we are standards conforming. | |
749 | |
750 If FIRST is NULL replace_args () swallows the comma. */ | |
751 if (macro->variadic && (argc < macro->paramc | |
752 || (argc == 1 && args[0].count == 0 | |
753 && !CPP_OPTION (pfile, std)))) | |
754 args[macro->paramc - 1].first = NULL; | |
755 return base_buff; | |
756 } | |
757 } | |
758 | |
759 /* An error occurred. */ | |
760 _cpp_release_buff (pfile, base_buff); | |
761 return NULL; | |
762 } | |
763 | |
764 /* Search for an opening parenthesis to the macro of NODE, in such a | |
765 way that, if none is found, we don't lose the information in any | |
766 intervening padding tokens. If we find the parenthesis, collect | |
767 the arguments and return the buffer containing them. PRAGMA_BUFF | |
768 argument is the same as in collect_args. */ | |
769 static _cpp_buff * | |
770 funlike_invocation_p (cpp_reader *pfile, cpp_hashnode *node, | |
771 _cpp_buff **pragma_buff) | |
772 { | |
773 const cpp_token *token, *padding = NULL; | |
774 | |
775 for (;;) | |
776 { | |
777 token = cpp_get_token (pfile); | |
778 if (token->type != CPP_PADDING) | |
779 break; | |
780 if (padding == NULL | |
781 || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) | |
782 padding = token; | |
783 } | |
784 | |
785 if (token->type == CPP_OPEN_PAREN) | |
786 { | |
787 pfile->state.parsing_args = 2; | |
788 return collect_args (pfile, node, pragma_buff); | |
789 } | |
790 | |
791 /* CPP_EOF can be the end of macro arguments, or the end of the | |
792 file. We mustn't back up over the latter. Ugh. */ | |
793 if (token->type != CPP_EOF || token == &pfile->eof) | |
794 { | |
795 /* Back up. We may have skipped padding, in which case backing | |
796 up more than one token when expanding macros is in general | |
797 too difficult. We re-insert it in its own context. */ | |
798 _cpp_backup_tokens (pfile, 1); | |
799 if (padding) | |
800 _cpp_push_token_context (pfile, NULL, padding, 1); | |
801 } | |
802 | |
803 return NULL; | |
804 } | |
805 | |
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806 /* Return the real number of tokens in the expansion of MACRO. */ |
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807 static inline unsigned int |
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808 macro_real_token_count (const cpp_macro *macro) |
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809 { |
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810 unsigned int i; |
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811 if (__builtin_expect (!macro->extra_tokens, true)) |
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812 return macro->count; |
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813 for (i = 0; i < macro->count; i++) |
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814 if (macro->exp.tokens[i].type == CPP_PASTE) |
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815 return i; |
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816 abort (); |
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817 } |
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818 |
0 | 819 /* Push the context of a macro with hash entry NODE onto the context |
820 stack. If we can successfully expand the macro, we push a context | |
821 containing its yet-to-be-rescanned replacement list and return one. | |
822 If there were additionally any unexpanded deferred #pragma directives | |
823 among macro arguments, push another context containing the | |
824 pragma tokens before the yet-to-be-rescanned replacement list | |
825 and return two. Otherwise, we don't push a context and return zero. */ | |
826 static int | |
827 enter_macro_context (cpp_reader *pfile, cpp_hashnode *node, | |
828 const cpp_token *result) | |
829 { | |
830 /* The presence of a macro invalidates a file's controlling macro. */ | |
831 pfile->mi_valid = false; | |
832 | |
833 pfile->state.angled_headers = false; | |
834 | |
835 if ((node->flags & NODE_BUILTIN) && !(node->flags & NODE_USED)) | |
836 { | |
837 node->flags |= NODE_USED; | |
838 if (pfile->cb.used_define) | |
839 pfile->cb.used_define (pfile, pfile->directive_line, node); | |
840 } | |
841 | |
842 /* Handle standard macros. */ | |
843 if (! (node->flags & NODE_BUILTIN)) | |
844 { | |
845 cpp_macro *macro = node->value.macro; | |
846 _cpp_buff *pragma_buff = NULL; | |
847 | |
848 if (macro->fun_like) | |
849 { | |
850 _cpp_buff *buff; | |
851 | |
852 pfile->state.prevent_expansion++; | |
853 pfile->keep_tokens++; | |
854 pfile->state.parsing_args = 1; | |
855 buff = funlike_invocation_p (pfile, node, &pragma_buff); | |
856 pfile->state.parsing_args = 0; | |
857 pfile->keep_tokens--; | |
858 pfile->state.prevent_expansion--; | |
859 | |
860 if (buff == NULL) | |
861 { | |
862 if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr) | |
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863 cpp_warning (pfile, CPP_W_TRADITIONAL, |
0 | 864 "function-like macro \"%s\" must be used with arguments in traditional C", |
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865 NODE_NAME (node)); |
0 | 866 |
867 if (pragma_buff) | |
868 _cpp_release_buff (pfile, pragma_buff); | |
869 | |
870 return 0; | |
871 } | |
872 | |
873 if (macro->paramc > 0) | |
874 replace_args (pfile, node, macro, (macro_arg *) buff->base); | |
875 _cpp_release_buff (pfile, buff); | |
876 } | |
877 | |
878 /* Disable the macro within its expansion. */ | |
879 node->flags |= NODE_DISABLED; | |
880 | |
881 if (!(node->flags & NODE_USED)) | |
882 { | |
883 node->flags |= NODE_USED; | |
884 if (pfile->cb.used_define) | |
885 pfile->cb.used_define (pfile, pfile->directive_line, node); | |
886 } | |
887 | |
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888 if (pfile->cb.used) |
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889 pfile->cb.used (pfile, result->src_loc, node); |
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890 |
0 | 891 macro->used = 1; |
892 | |
893 if (macro->paramc == 0) | |
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894 _cpp_push_token_context (pfile, node, macro->exp.tokens, |
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895 macro_real_token_count (macro)); |
0 | 896 |
897 if (pragma_buff) | |
898 { | |
899 if (!pfile->state.in_directive) | |
900 _cpp_push_token_context (pfile, NULL, | |
901 padding_token (pfile, result), 1); | |
902 do | |
903 { | |
904 _cpp_buff *tail = pragma_buff->next; | |
905 pragma_buff->next = NULL; | |
906 push_ptoken_context (pfile, NULL, pragma_buff, | |
907 (const cpp_token **) pragma_buff->base, | |
908 ((const cpp_token **) BUFF_FRONT (pragma_buff) | |
909 - (const cpp_token **) pragma_buff->base)); | |
910 pragma_buff = tail; | |
911 } | |
912 while (pragma_buff != NULL); | |
913 return 2; | |
914 } | |
915 | |
916 return 1; | |
917 } | |
918 | |
919 /* Handle built-in macros and the _Pragma operator. */ | |
920 return builtin_macro (pfile, node); | |
921 } | |
922 | |
923 /* Replace the parameters in a function-like macro of NODE with the | |
924 actual ARGS, and place the result in a newly pushed token context. | |
925 Expand each argument before replacing, unless it is operated upon | |
926 by the # or ## operators. */ | |
927 static void | |
928 replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro, macro_arg *args) | |
929 { | |
930 unsigned int i, total; | |
931 const cpp_token *src, *limit; | |
932 const cpp_token **dest, **first; | |
933 macro_arg *arg; | |
934 _cpp_buff *buff; | |
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935 unsigned int count; |
0 | 936 |
937 /* First, fully macro-expand arguments, calculating the number of | |
938 tokens in the final expansion as we go. The ordering of the if | |
939 statements below is subtle; we must handle stringification before | |
940 pasting. */ | |
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941 count = macro_real_token_count (macro); |
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942 total = count; |
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943 limit = macro->exp.tokens + count; |
0 | 944 |
945 for (src = macro->exp.tokens; src < limit; src++) | |
946 if (src->type == CPP_MACRO_ARG) | |
947 { | |
948 /* Leading and trailing padding tokens. */ | |
949 total += 2; | |
950 | |
951 /* We have an argument. If it is not being stringified or | |
952 pasted it is macro-replaced before insertion. */ | |
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953 arg = &args[src->val.macro_arg.arg_no - 1]; |
0 | 954 |
955 if (src->flags & STRINGIFY_ARG) | |
956 { | |
957 if (!arg->stringified) | |
958 arg->stringified = stringify_arg (pfile, arg); | |
959 } | |
960 else if ((src->flags & PASTE_LEFT) | |
961 || (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT))) | |
962 total += arg->count - 1; | |
963 else | |
964 { | |
965 if (!arg->expanded) | |
966 expand_arg (pfile, arg); | |
967 total += arg->expanded_count - 1; | |
968 } | |
969 } | |
970 | |
971 /* Now allocate space for the expansion, copy the tokens and replace | |
972 the arguments. */ | |
973 buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); | |
974 first = (const cpp_token **) buff->base; | |
975 dest = first; | |
976 | |
977 for (src = macro->exp.tokens; src < limit; src++) | |
978 { | |
979 unsigned int count; | |
980 const cpp_token **from, **paste_flag; | |
981 | |
982 if (src->type != CPP_MACRO_ARG) | |
983 { | |
984 *dest++ = src; | |
985 continue; | |
986 } | |
987 | |
988 paste_flag = 0; | |
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989 arg = &args[src->val.macro_arg.arg_no - 1]; |
0 | 990 if (src->flags & STRINGIFY_ARG) |
991 count = 1, from = &arg->stringified; | |
992 else if (src->flags & PASTE_LEFT) | |
993 count = arg->count, from = arg->first; | |
994 else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)) | |
995 { | |
996 count = arg->count, from = arg->first; | |
997 if (dest != first) | |
998 { | |
999 if (dest[-1]->type == CPP_COMMA | |
1000 && macro->variadic | |
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1001 && src->val.macro_arg.arg_no == macro->paramc) |
0 | 1002 { |
1003 /* Swallow a pasted comma if from == NULL, otherwise | |
1004 drop the paste flag. */ | |
1005 if (from == NULL) | |
1006 dest--; | |
1007 else | |
1008 paste_flag = dest - 1; | |
1009 } | |
1010 /* Remove the paste flag if the RHS is a placemarker. */ | |
1011 else if (count == 0) | |
1012 paste_flag = dest - 1; | |
1013 } | |
1014 } | |
1015 else | |
1016 count = arg->expanded_count, from = arg->expanded; | |
1017 | |
1018 /* Padding on the left of an argument (unless RHS of ##). */ | |
1019 if ((!pfile->state.in_directive || pfile->state.directive_wants_padding) | |
1020 && src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT)) | |
1021 *dest++ = padding_token (pfile, src); | |
1022 | |
1023 if (count) | |
1024 { | |
1025 memcpy (dest, from, count * sizeof (cpp_token *)); | |
1026 dest += count; | |
1027 | |
1028 /* With a non-empty argument on the LHS of ##, the last | |
1029 token should be flagged PASTE_LEFT. */ | |
1030 if (src->flags & PASTE_LEFT) | |
1031 paste_flag = dest - 1; | |
1032 } | |
1033 else if (CPP_PEDANTIC (pfile) && ! macro->syshdr | |
1034 && ! CPP_OPTION (pfile, c99) | |
1035 && ! cpp_in_system_header (pfile)) | |
1036 { | |
1037 cpp_error (pfile, CPP_DL_PEDWARN, | |
1038 "invoking macro %s argument %d: " | |
1039 "empty macro arguments are undefined" | |
1040 " in ISO C90 and ISO C++98", | |
1041 NODE_NAME (node), | |
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1042 src->val.macro_arg.arg_no); |
0 | 1043 } |
1044 | |
1045 /* Avoid paste on RHS (even case count == 0). */ | |
1046 if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) | |
1047 *dest++ = &pfile->avoid_paste; | |
1048 | |
1049 /* Add a new paste flag, or remove an unwanted one. */ | |
1050 if (paste_flag) | |
1051 { | |
1052 cpp_token *token = _cpp_temp_token (pfile); | |
1053 token->type = (*paste_flag)->type; | |
1054 token->val = (*paste_flag)->val; | |
1055 if (src->flags & PASTE_LEFT) | |
1056 token->flags = (*paste_flag)->flags | PASTE_LEFT; | |
1057 else | |
1058 token->flags = (*paste_flag)->flags & ~PASTE_LEFT; | |
1059 *paste_flag = token; | |
1060 } | |
1061 } | |
1062 | |
1063 /* Free the expanded arguments. */ | |
1064 for (i = 0; i < macro->paramc; i++) | |
1065 if (args[i].expanded) | |
1066 free (args[i].expanded); | |
1067 | |
1068 push_ptoken_context (pfile, node, buff, first, dest - first); | |
1069 } | |
1070 | |
1071 /* Return a special padding token, with padding inherited from SOURCE. */ | |
1072 static const cpp_token * | |
1073 padding_token (cpp_reader *pfile, const cpp_token *source) | |
1074 { | |
1075 cpp_token *result = _cpp_temp_token (pfile); | |
1076 | |
1077 result->type = CPP_PADDING; | |
1078 | |
1079 /* Data in GCed data structures cannot be made const so far, so we | |
1080 need a cast here. */ | |
1081 result->val.source = (cpp_token *) source; | |
1082 result->flags = 0; | |
1083 return result; | |
1084 } | |
1085 | |
1086 /* Get a new uninitialized context. Create a new one if we cannot | |
1087 re-use an old one. */ | |
1088 static cpp_context * | |
1089 next_context (cpp_reader *pfile) | |
1090 { | |
1091 cpp_context *result = pfile->context->next; | |
1092 | |
1093 if (result == 0) | |
1094 { | |
1095 result = XNEW (cpp_context); | |
1096 result->prev = pfile->context; | |
1097 result->next = 0; | |
1098 pfile->context->next = result; | |
1099 } | |
1100 | |
1101 pfile->context = result; | |
1102 return result; | |
1103 } | |
1104 | |
1105 /* Push a list of pointers to tokens. */ | |
1106 static void | |
1107 push_ptoken_context (cpp_reader *pfile, cpp_hashnode *macro, _cpp_buff *buff, | |
1108 const cpp_token **first, unsigned int count) | |
1109 { | |
1110 cpp_context *context = next_context (pfile); | |
1111 | |
1112 context->direct_p = false; | |
1113 context->macro = macro; | |
1114 context->buff = buff; | |
1115 FIRST (context).ptoken = first; | |
1116 LAST (context).ptoken = first + count; | |
1117 } | |
1118 | |
1119 /* Push a list of tokens. */ | |
1120 void | |
1121 _cpp_push_token_context (cpp_reader *pfile, cpp_hashnode *macro, | |
1122 const cpp_token *first, unsigned int count) | |
1123 { | |
1124 cpp_context *context = next_context (pfile); | |
1125 | |
1126 context->direct_p = true; | |
1127 context->macro = macro; | |
1128 context->buff = NULL; | |
1129 FIRST (context).token = first; | |
1130 LAST (context).token = first + count; | |
1131 } | |
1132 | |
1133 /* Push a traditional macro's replacement text. */ | |
1134 void | |
1135 _cpp_push_text_context (cpp_reader *pfile, cpp_hashnode *macro, | |
1136 const uchar *start, size_t len) | |
1137 { | |
1138 cpp_context *context = next_context (pfile); | |
1139 | |
1140 context->direct_p = true; | |
1141 context->macro = macro; | |
1142 context->buff = NULL; | |
1143 CUR (context) = start; | |
1144 RLIMIT (context) = start + len; | |
1145 macro->flags |= NODE_DISABLED; | |
1146 } | |
1147 | |
1148 /* Expand an argument ARG before replacing parameters in a | |
1149 function-like macro. This works by pushing a context with the | |
1150 argument's tokens, and then expanding that into a temporary buffer | |
1151 as if it were a normal part of the token stream. collect_args() | |
1152 has terminated the argument's tokens with a CPP_EOF so that we know | |
1153 when we have fully expanded the argument. */ | |
1154 static void | |
1155 expand_arg (cpp_reader *pfile, macro_arg *arg) | |
1156 { | |
1157 unsigned int capacity; | |
1158 bool saved_warn_trad; | |
1159 | |
1160 if (arg->count == 0) | |
1161 return; | |
1162 | |
1163 /* Don't warn about funlike macros when pre-expanding. */ | |
1164 saved_warn_trad = CPP_WTRADITIONAL (pfile); | |
1165 CPP_WTRADITIONAL (pfile) = 0; | |
1166 | |
1167 /* Loop, reading in the arguments. */ | |
1168 capacity = 256; | |
1169 arg->expanded = XNEWVEC (const cpp_token *, capacity); | |
1170 | |
1171 push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); | |
1172 for (;;) | |
1173 { | |
1174 const cpp_token *token; | |
1175 | |
1176 if (arg->expanded_count + 1 >= capacity) | |
1177 { | |
1178 capacity *= 2; | |
1179 arg->expanded = XRESIZEVEC (const cpp_token *, arg->expanded, | |
1180 capacity); | |
1181 } | |
1182 | |
1183 token = cpp_get_token (pfile); | |
1184 | |
1185 if (token->type == CPP_EOF) | |
1186 break; | |
1187 | |
1188 arg->expanded[arg->expanded_count++] = token; | |
1189 } | |
1190 | |
1191 _cpp_pop_context (pfile); | |
1192 | |
1193 CPP_WTRADITIONAL (pfile) = saved_warn_trad; | |
1194 } | |
1195 | |
1196 /* Pop the current context off the stack, re-enabling the macro if the | |
1197 context represented a macro's replacement list. The context | |
1198 structure is not freed so that we can re-use it later. */ | |
1199 void | |
1200 _cpp_pop_context (cpp_reader *pfile) | |
1201 { | |
1202 cpp_context *context = pfile->context; | |
1203 | |
1204 if (context->macro) | |
1205 context->macro->flags &= ~NODE_DISABLED; | |
1206 | |
1207 if (context->buff) | |
1208 _cpp_release_buff (pfile, context->buff); | |
1209 | |
1210 pfile->context = context->prev; | |
1211 } | |
1212 | |
1213 /* External routine to get a token. Also used nearly everywhere | |
1214 internally, except for places where we know we can safely call | |
1215 _cpp_lex_token directly, such as lexing a directive name. | |
1216 | |
1217 Macro expansions and directives are transparently handled, | |
1218 including entering included files. Thus tokens are post-macro | |
1219 expansion, and after any intervening directives. External callers | |
1220 see CPP_EOF only at EOF. Internal callers also see it when meeting | |
1221 a directive inside a macro call, when at the end of a directive and | |
1222 state.in_directive is still 1, and at the end of argument | |
1223 pre-expansion. */ | |
1224 const cpp_token * | |
1225 cpp_get_token (cpp_reader *pfile) | |
1226 { | |
1227 const cpp_token *result; | |
1228 bool can_set = pfile->set_invocation_location; | |
1229 pfile->set_invocation_location = false; | |
1230 | |
1231 for (;;) | |
1232 { | |
1233 cpp_hashnode *node; | |
1234 cpp_context *context = pfile->context; | |
1235 | |
1236 /* Context->prev == 0 <=> base context. */ | |
1237 if (!context->prev) | |
1238 result = _cpp_lex_token (pfile); | |
1239 else if (FIRST (context).token != LAST (context).token) | |
1240 { | |
1241 if (context->direct_p) | |
1242 result = FIRST (context).token++; | |
1243 else | |
1244 result = *FIRST (context).ptoken++; | |
1245 | |
1246 if (result->flags & PASTE_LEFT) | |
1247 { | |
1248 paste_all_tokens (pfile, result); | |
1249 if (pfile->state.in_directive) | |
1250 continue; | |
1251 return padding_token (pfile, result); | |
1252 } | |
1253 } | |
1254 else | |
1255 { | |
1256 _cpp_pop_context (pfile); | |
1257 if (pfile->state.in_directive) | |
1258 continue; | |
1259 return &pfile->avoid_paste; | |
1260 } | |
1261 | |
1262 if (pfile->state.in_directive && result->type == CPP_COMMENT) | |
1263 continue; | |
1264 | |
1265 if (result->type != CPP_NAME) | |
1266 break; | |
1267 | |
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1268 node = result->val.node.node; |
0 | 1269 |
1270 if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) | |
1271 break; | |
1272 | |
1273 if (!(node->flags & NODE_DISABLED)) | |
1274 { | |
1275 int ret = 0; | |
1276 /* If not in a macro context, and we're going to start an | |
1277 expansion, record the location. */ | |
1278 if (can_set && !context->macro) | |
1279 pfile->invocation_location = result->src_loc; | |
1280 if (pfile->state.prevent_expansion) | |
1281 break; | |
1282 | |
1283 /* Conditional macros require that a predicate be evaluated | |
1284 first. */ | |
1285 if ((node->flags & NODE_CONDITIONAL) != 0) | |
1286 { | |
1287 if (pfile->cb.macro_to_expand) | |
1288 { | |
1289 bool whitespace_after; | |
1290 const cpp_token *peek_tok = cpp_peek_token (pfile, 0); | |
1291 | |
1292 whitespace_after = (peek_tok->type == CPP_PADDING | |
1293 || (peek_tok->flags & PREV_WHITE)); | |
1294 node = pfile->cb.macro_to_expand (pfile, result); | |
1295 if (node) | |
1296 ret = enter_macro_context (pfile, node, result); | |
1297 else if (whitespace_after) | |
1298 { | |
1299 /* If macro_to_expand hook returned NULL and it | |
1300 ate some tokens, see if we don't need to add | |
1301 a padding token in between this and the | |
1302 next token. */ | |
1303 peek_tok = cpp_peek_token (pfile, 0); | |
1304 if (peek_tok->type != CPP_PADDING | |
1305 && (peek_tok->flags & PREV_WHITE) == 0) | |
1306 _cpp_push_token_context (pfile, NULL, | |
1307 padding_token (pfile, | |
1308 peek_tok), 1); | |
1309 } | |
1310 } | |
1311 } | |
1312 else | |
1313 ret = enter_macro_context (pfile, node, result); | |
1314 if (ret) | |
1315 { | |
1316 if (pfile->state.in_directive || ret == 2) | |
1317 continue; | |
1318 return padding_token (pfile, result); | |
1319 } | |
1320 } | |
1321 else | |
1322 { | |
1323 /* Flag this token as always unexpandable. FIXME: move this | |
1324 to collect_args()?. */ | |
1325 cpp_token *t = _cpp_temp_token (pfile); | |
1326 t->type = result->type; | |
1327 t->flags = result->flags | NO_EXPAND; | |
1328 t->val = result->val; | |
1329 result = t; | |
1330 } | |
1331 | |
1332 break; | |
1333 } | |
1334 | |
1335 return result; | |
1336 } | |
1337 | |
1338 /* Like cpp_get_token, but also returns a location separate from the | |
1339 one provided by the returned token. LOC is an out parameter; *LOC | |
1340 is set to the location "as expected by the user". This matters | |
1341 when a token results from macro expansion -- the token's location | |
1342 will indicate where the macro is defined, but *LOC will be the | |
1343 location of the start of the expansion. */ | |
1344 const cpp_token * | |
1345 cpp_get_token_with_location (cpp_reader *pfile, source_location *loc) | |
1346 { | |
1347 const cpp_token *result; | |
1348 | |
1349 pfile->set_invocation_location = true; | |
1350 result = cpp_get_token (pfile); | |
1351 if (pfile->context->macro) | |
1352 *loc = pfile->invocation_location; | |
1353 else | |
1354 *loc = result->src_loc; | |
1355 | |
1356 return result; | |
1357 } | |
1358 | |
1359 /* Returns true if we're expanding an object-like macro that was | |
1360 defined in a system header. Just checks the macro at the top of | |
1361 the stack. Used for diagnostic suppression. */ | |
1362 int | |
1363 cpp_sys_macro_p (cpp_reader *pfile) | |
1364 { | |
1365 cpp_hashnode *node = pfile->context->macro; | |
1366 | |
1367 return node && node->value.macro && node->value.macro->syshdr; | |
1368 } | |
1369 | |
1370 /* Read each token in, until end of the current file. Directives are | |
1371 transparently processed. */ | |
1372 void | |
1373 cpp_scan_nooutput (cpp_reader *pfile) | |
1374 { | |
1375 /* Request a CPP_EOF token at the end of this file, rather than | |
1376 transparently continuing with the including file. */ | |
1377 pfile->buffer->return_at_eof = true; | |
1378 | |
1379 pfile->state.discarding_output++; | |
1380 pfile->state.prevent_expansion++; | |
1381 | |
1382 if (CPP_OPTION (pfile, traditional)) | |
1383 while (_cpp_read_logical_line_trad (pfile)) | |
1384 ; | |
1385 else | |
1386 while (cpp_get_token (pfile)->type != CPP_EOF) | |
1387 ; | |
1388 | |
1389 pfile->state.discarding_output--; | |
1390 pfile->state.prevent_expansion--; | |
1391 } | |
1392 | |
1393 /* Step back one or more tokens obtained from the lexer. */ | |
1394 void | |
1395 _cpp_backup_tokens_direct (cpp_reader *pfile, unsigned int count) | |
1396 { | |
1397 pfile->lookaheads += count; | |
1398 while (count--) | |
1399 { | |
1400 pfile->cur_token--; | |
1401 if (pfile->cur_token == pfile->cur_run->base | |
1402 /* Possible with -fpreprocessed and no leading #line. */ | |
1403 && pfile->cur_run->prev != NULL) | |
1404 { | |
1405 pfile->cur_run = pfile->cur_run->prev; | |
1406 pfile->cur_token = pfile->cur_run->limit; | |
1407 } | |
1408 } | |
1409 } | |
1410 | |
1411 /* Step back one (or more) tokens. Can only step back more than 1 if | |
1412 they are from the lexer, and not from macro expansion. */ | |
1413 void | |
1414 _cpp_backup_tokens (cpp_reader *pfile, unsigned int count) | |
1415 { | |
1416 if (pfile->context->prev == NULL) | |
1417 _cpp_backup_tokens_direct (pfile, count); | |
1418 else | |
1419 { | |
1420 if (count != 1) | |
1421 abort (); | |
1422 if (pfile->context->direct_p) | |
1423 FIRST (pfile->context).token--; | |
1424 else | |
1425 FIRST (pfile->context).ptoken--; | |
1426 } | |
1427 } | |
1428 | |
1429 /* #define directive parsing and handling. */ | |
1430 | |
1431 /* Returns nonzero if a macro redefinition warning is required. */ | |
1432 static bool | |
1433 warn_of_redefinition (cpp_reader *pfile, const cpp_hashnode *node, | |
1434 const cpp_macro *macro2) | |
1435 { | |
1436 const cpp_macro *macro1; | |
1437 unsigned int i; | |
1438 | |
1439 /* Some redefinitions need to be warned about regardless. */ | |
1440 if (node->flags & NODE_WARN) | |
1441 return true; | |
1442 | |
1443 /* Suppress warnings for builtins that lack the NODE_WARN flag. */ | |
1444 if (node->flags & NODE_BUILTIN) | |
1445 return false; | |
1446 | |
1447 /* Redefinitions of conditional (context-sensitive) macros, on | |
1448 the other hand, must be allowed silently. */ | |
1449 if (node->flags & NODE_CONDITIONAL) | |
1450 return false; | |
1451 | |
1452 /* Redefinition of a macro is allowed if and only if the old and new | |
1453 definitions are the same. (6.10.3 paragraph 2). */ | |
1454 macro1 = node->value.macro; | |
1455 | |
1456 /* Don't check count here as it can be different in valid | |
1457 traditional redefinitions with just whitespace differences. */ | |
1458 if (macro1->paramc != macro2->paramc | |
1459 || macro1->fun_like != macro2->fun_like | |
1460 || macro1->variadic != macro2->variadic) | |
1461 return true; | |
1462 | |
1463 /* Check parameter spellings. */ | |
1464 for (i = 0; i < macro1->paramc; i++) | |
1465 if (macro1->params[i] != macro2->params[i]) | |
1466 return true; | |
1467 | |
1468 /* Check the replacement text or tokens. */ | |
1469 if (CPP_OPTION (pfile, traditional)) | |
1470 return _cpp_expansions_different_trad (macro1, macro2); | |
1471 | |
1472 if (macro1->count != macro2->count) | |
1473 return true; | |
1474 | |
1475 for (i = 0; i < macro1->count; i++) | |
1476 if (!_cpp_equiv_tokens (¯o1->exp.tokens[i], ¯o2->exp.tokens[i])) | |
1477 return true; | |
1478 | |
1479 return false; | |
1480 } | |
1481 | |
1482 /* Free the definition of hashnode H. */ | |
1483 void | |
1484 _cpp_free_definition (cpp_hashnode *h) | |
1485 { | |
1486 /* Macros and assertions no longer have anything to free. */ | |
1487 h->type = NT_VOID; | |
1488 /* Clear builtin flag in case of redefinition. */ | |
1489 h->flags &= ~(NODE_BUILTIN | NODE_DISABLED | NODE_USED); | |
1490 } | |
1491 | |
1492 /* Save parameter NODE to the parameter list of macro MACRO. Returns | |
1493 zero on success, nonzero if the parameter is a duplicate. */ | |
1494 bool | |
1495 _cpp_save_parameter (cpp_reader *pfile, cpp_macro *macro, cpp_hashnode *node) | |
1496 { | |
1497 unsigned int len; | |
1498 /* Constraint 6.10.3.6 - duplicate parameter names. */ | |
1499 if (node->flags & NODE_MACRO_ARG) | |
1500 { | |
1501 cpp_error (pfile, CPP_DL_ERROR, "duplicate macro parameter \"%s\"", | |
1502 NODE_NAME (node)); | |
1503 return true; | |
1504 } | |
1505 | |
1506 if (BUFF_ROOM (pfile->a_buff) | |
1507 < (macro->paramc + 1) * sizeof (cpp_hashnode *)) | |
1508 _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); | |
1509 | |
1510 ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; | |
1511 node->flags |= NODE_MACRO_ARG; | |
1512 len = macro->paramc * sizeof (union _cpp_hashnode_value); | |
1513 if (len > pfile->macro_buffer_len) | |
1514 { | |
1515 pfile->macro_buffer = XRESIZEVEC (unsigned char, pfile->macro_buffer, | |
1516 len); | |
1517 pfile->macro_buffer_len = len; | |
1518 } | |
1519 ((union _cpp_hashnode_value *) pfile->macro_buffer)[macro->paramc - 1] | |
1520 = node->value; | |
1521 | |
1522 node->value.arg_index = macro->paramc; | |
1523 return false; | |
1524 } | |
1525 | |
1526 /* Check the syntax of the parameters in a MACRO definition. Returns | |
1527 false if an error occurs. */ | |
1528 static bool | |
1529 parse_params (cpp_reader *pfile, cpp_macro *macro) | |
1530 { | |
1531 unsigned int prev_ident = 0; | |
1532 | |
1533 for (;;) | |
1534 { | |
1535 const cpp_token *token = _cpp_lex_token (pfile); | |
1536 | |
1537 switch (token->type) | |
1538 { | |
1539 default: | |
1540 /* Allow/ignore comments in parameter lists if we are | |
1541 preserving comments in macro expansions. */ | |
1542 if (token->type == CPP_COMMENT | |
1543 && ! CPP_OPTION (pfile, discard_comments_in_macro_exp)) | |
1544 continue; | |
1545 | |
1546 cpp_error (pfile, CPP_DL_ERROR, | |
1547 "\"%s\" may not appear in macro parameter list", | |
1548 cpp_token_as_text (pfile, token)); | |
1549 return false; | |
1550 | |
1551 case CPP_NAME: | |
1552 if (prev_ident) | |
1553 { | |
1554 cpp_error (pfile, CPP_DL_ERROR, | |
1555 "macro parameters must be comma-separated"); | |
1556 return false; | |
1557 } | |
1558 prev_ident = 1; | |
1559 | |
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parents:
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1560 if (_cpp_save_parameter (pfile, macro, token->val.node.node)) |
0 | 1561 return false; |
1562 continue; | |
1563 | |
1564 case CPP_CLOSE_PAREN: | |
1565 if (prev_ident || macro->paramc == 0) | |
1566 return true; | |
1567 | |
1568 /* Fall through to pick up the error. */ | |
1569 case CPP_COMMA: | |
1570 if (!prev_ident) | |
1571 { | |
1572 cpp_error (pfile, CPP_DL_ERROR, "parameter name missing"); | |
1573 return false; | |
1574 } | |
1575 prev_ident = 0; | |
1576 continue; | |
1577 | |
1578 case CPP_ELLIPSIS: | |
1579 macro->variadic = 1; | |
1580 if (!prev_ident) | |
1581 { | |
1582 _cpp_save_parameter (pfile, macro, | |
1583 pfile->spec_nodes.n__VA_ARGS__); | |
1584 pfile->state.va_args_ok = 1; | |
1585 if (! CPP_OPTION (pfile, c99) | |
1586 && CPP_OPTION (pfile, pedantic) | |
1587 && CPP_OPTION (pfile, warn_variadic_macros)) | |
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1588 cpp_pedwarning |
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parents:
55
diff
changeset
|
1589 (pfile, CPP_W_VARIADIC_MACROS, |
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1590 "anonymous variadic macros were introduced in C99"); |
0 | 1591 } |
1592 else if (CPP_OPTION (pfile, pedantic) | |
1593 && CPP_OPTION (pfile, warn_variadic_macros)) | |
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1594 cpp_pedwarning (pfile, CPP_W_VARIADIC_MACROS, |
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1595 "ISO C does not permit named variadic macros"); |
0 | 1596 |
1597 /* We're at the end, and just expect a closing parenthesis. */ | |
1598 token = _cpp_lex_token (pfile); | |
1599 if (token->type == CPP_CLOSE_PAREN) | |
1600 return true; | |
1601 /* Fall through. */ | |
1602 | |
1603 case CPP_EOF: | |
1604 cpp_error (pfile, CPP_DL_ERROR, "missing ')' in macro parameter list"); | |
1605 return false; | |
1606 } | |
1607 } | |
1608 } | |
1609 | |
1610 /* Allocate room for a token from a macro's replacement list. */ | |
1611 static cpp_token * | |
1612 alloc_expansion_token (cpp_reader *pfile, cpp_macro *macro) | |
1613 { | |
1614 if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) | |
1615 _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); | |
1616 | |
1617 return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; | |
1618 } | |
1619 | |
1620 /* Lex a token from the expansion of MACRO, but mark parameters as we | |
1621 find them and warn of traditional stringification. */ | |
1622 static cpp_token * | |
1623 lex_expansion_token (cpp_reader *pfile, cpp_macro *macro) | |
1624 { | |
1625 cpp_token *token, *saved_cur_token; | |
1626 | |
1627 saved_cur_token = pfile->cur_token; | |
1628 pfile->cur_token = alloc_expansion_token (pfile, macro); | |
1629 token = _cpp_lex_direct (pfile); | |
1630 pfile->cur_token = saved_cur_token; | |
1631 | |
1632 /* Is this a parameter? */ | |
1633 if (token->type == CPP_NAME | |
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1634 && (token->val.node.node->flags & NODE_MACRO_ARG) != 0) |
0 | 1635 { |
1636 token->type = CPP_MACRO_ARG; | |
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1637 token->val.macro_arg.arg_no = token->val.node.node->value.arg_index; |
0 | 1638 } |
1639 else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 | |
1640 && (token->type == CPP_STRING || token->type == CPP_CHAR)) | |
1641 check_trad_stringification (pfile, macro, &token->val.str); | |
1642 | |
1643 return token; | |
1644 } | |
1645 | |
1646 static bool | |
1647 create_iso_definition (cpp_reader *pfile, cpp_macro *macro) | |
1648 { | |
1649 cpp_token *token; | |
1650 const cpp_token *ctoken; | |
1651 bool following_paste_op = false; | |
1652 const char *paste_op_error_msg = | |
1653 N_("'##' cannot appear at either end of a macro expansion"); | |
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1654 unsigned int num_extra_tokens = 0; |
0 | 1655 |
1656 /* Get the first token of the expansion (or the '(' of a | |
1657 function-like macro). */ | |
1658 ctoken = _cpp_lex_token (pfile); | |
1659 | |
1660 if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) | |
1661 { | |
1662 bool ok = parse_params (pfile, macro); | |
1663 macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); | |
1664 if (!ok) | |
1665 return false; | |
1666 | |
1667 /* Success. Commit or allocate the parameter array. */ | |
1668 if (pfile->hash_table->alloc_subobject) | |
1669 { | |
1670 cpp_hashnode **params = | |
1671 (cpp_hashnode **) pfile->hash_table->alloc_subobject | |
1672 (sizeof (cpp_hashnode *) * macro->paramc); | |
1673 memcpy (params, macro->params, | |
1674 sizeof (cpp_hashnode *) * macro->paramc); | |
1675 macro->params = params; | |
1676 } | |
1677 else | |
1678 BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->params[macro->paramc]; | |
1679 macro->fun_like = 1; | |
1680 } | |
1681 else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) | |
1682 { | |
1683 /* While ISO C99 requires whitespace before replacement text | |
1684 in a macro definition, ISO C90 with TC1 allows there characters | |
1685 from the basic source character set. */ | |
1686 if (CPP_OPTION (pfile, c99)) | |
1687 cpp_error (pfile, CPP_DL_PEDWARN, | |
1688 "ISO C99 requires whitespace after the macro name"); | |
1689 else | |
1690 { | |
1691 int warntype = CPP_DL_WARNING; | |
1692 switch (ctoken->type) | |
1693 { | |
1694 case CPP_ATSIGN: | |
1695 case CPP_AT_NAME: | |
1696 case CPP_OBJC_STRING: | |
1697 /* '@' is not in basic character set. */ | |
1698 warntype = CPP_DL_PEDWARN; | |
1699 break; | |
1700 case CPP_OTHER: | |
1701 /* Basic character set sans letters, digits and _. */ | |
1702 if (strchr ("!\"#%&'()*+,-./:;<=>?[\\]^{|}~", | |
1703 ctoken->val.str.text[0]) == NULL) | |
1704 warntype = CPP_DL_PEDWARN; | |
1705 break; | |
1706 default: | |
1707 /* All other tokens start with a character from basic | |
1708 character set. */ | |
1709 break; | |
1710 } | |
1711 cpp_error (pfile, warntype, | |
1712 "missing whitespace after the macro name"); | |
1713 } | |
1714 } | |
1715 | |
1716 if (macro->fun_like) | |
1717 token = lex_expansion_token (pfile, macro); | |
1718 else | |
1719 { | |
1720 token = alloc_expansion_token (pfile, macro); | |
1721 *token = *ctoken; | |
1722 } | |
1723 | |
1724 for (;;) | |
1725 { | |
1726 /* Check the stringifying # constraint 6.10.3.2.1 of | |
1727 function-like macros when lexing the subsequent token. */ | |
1728 if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) | |
1729 { | |
1730 if (token->type == CPP_MACRO_ARG) | |
1731 { | |
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1732 if (token->flags & PREV_WHITE) |
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1733 token->flags |= SP_PREV_WHITE; |
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1734 if (token[-1].flags & DIGRAPH) |
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1735 token->flags |= SP_DIGRAPH; |
0 | 1736 token->flags &= ~PREV_WHITE; |
1737 token->flags |= STRINGIFY_ARG; | |
1738 token->flags |= token[-1].flags & PREV_WHITE; | |
1739 token[-1] = token[0]; | |
1740 macro->count--; | |
1741 } | |
1742 /* Let assembler get away with murder. */ | |
1743 else if (CPP_OPTION (pfile, lang) != CLK_ASM) | |
1744 { | |
1745 cpp_error (pfile, CPP_DL_ERROR, | |
1746 "'#' is not followed by a macro parameter"); | |
1747 return false; | |
1748 } | |
1749 } | |
1750 | |
1751 if (token->type == CPP_EOF) | |
1752 { | |
1753 /* Paste operator constraint 6.10.3.3.1: | |
1754 Token-paste ##, can appear in both object-like and | |
1755 function-like macros, but not at the end. */ | |
1756 if (following_paste_op) | |
1757 { | |
1758 cpp_error (pfile, CPP_DL_ERROR, paste_op_error_msg); | |
1759 return false; | |
1760 } | |
1761 break; | |
1762 } | |
1763 | |
1764 /* Paste operator constraint 6.10.3.3.1. */ | |
1765 if (token->type == CPP_PASTE) | |
1766 { | |
1767 /* Token-paste ##, can appear in both object-like and | |
1768 function-like macros, but not at the beginning. */ | |
1769 if (macro->count == 1) | |
1770 { | |
1771 cpp_error (pfile, CPP_DL_ERROR, paste_op_error_msg); | |
1772 return false; | |
1773 } | |
1774 | |
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1775 if (token[-1].flags & PASTE_LEFT) |
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1776 { |
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1777 macro->extra_tokens = 1; |
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1778 num_extra_tokens++; |
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1779 token->val.token_no = macro->count - 1; |
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1780 } |
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1781 else |
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1782 { |
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1783 --macro->count; |
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1784 token[-1].flags |= PASTE_LEFT; |
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1785 if (token->flags & DIGRAPH) |
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1786 token[-1].flags |= SP_DIGRAPH; |
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1787 if (token->flags & PREV_WHITE) |
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1788 token[-1].flags |= SP_PREV_WHITE; |
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1789 } |
0 | 1790 } |
1791 | |
1792 following_paste_op = (token->type == CPP_PASTE); | |
1793 token = lex_expansion_token (pfile, macro); | |
1794 } | |
1795 | |
1796 macro->exp.tokens = (cpp_token *) BUFF_FRONT (pfile->a_buff); | |
1797 macro->traditional = 0; | |
1798 | |
1799 /* Don't count the CPP_EOF. */ | |
1800 macro->count--; | |
1801 | |
1802 /* Clear whitespace on first token for warn_of_redefinition(). */ | |
1803 if (macro->count) | |
1804 macro->exp.tokens[0].flags &= ~PREV_WHITE; | |
1805 | |
1806 /* Commit or allocate the memory. */ | |
1807 if (pfile->hash_table->alloc_subobject) | |
1808 { | |
1809 cpp_token *tokns = | |
1810 (cpp_token *) pfile->hash_table->alloc_subobject (sizeof (cpp_token) | |
1811 * macro->count); | |
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1812 if (num_extra_tokens) |
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1813 { |
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1814 /* Place second and subsequent ## or %:%: tokens in |
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1815 sequences of consecutive such tokens at the end of the |
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1816 list to preserve information about where they appear, how |
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1817 they are spelt and whether they are preceded by |
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1818 whitespace without otherwise interfering with macro |
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1819 expansion. */ |
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1820 cpp_token *normal_dest = tokns; |
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1821 cpp_token *extra_dest = tokns + macro->count - num_extra_tokens; |
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1822 unsigned int i; |
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1823 for (i = 0; i < macro->count; i++) |
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1824 { |
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1825 if (macro->exp.tokens[i].type == CPP_PASTE) |
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1826 *extra_dest++ = macro->exp.tokens[i]; |
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1827 else |
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1828 *normal_dest++ = macro->exp.tokens[i]; |
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1829 } |
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1830 } |
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1831 else |
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1832 memcpy (tokns, macro->exp.tokens, sizeof (cpp_token) * macro->count); |
0 | 1833 macro->exp.tokens = tokns; |
1834 } | |
1835 else | |
1836 BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->exp.tokens[macro->count]; | |
1837 | |
1838 return true; | |
1839 } | |
1840 | |
1841 /* Parse a macro and save its expansion. Returns nonzero on success. */ | |
1842 bool | |
1843 _cpp_create_definition (cpp_reader *pfile, cpp_hashnode *node) | |
1844 { | |
1845 cpp_macro *macro; | |
1846 unsigned int i; | |
1847 bool ok; | |
1848 | |
1849 if (pfile->hash_table->alloc_subobject) | |
1850 macro = (cpp_macro *) pfile->hash_table->alloc_subobject | |
1851 (sizeof (cpp_macro)); | |
1852 else | |
1853 macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); | |
1854 macro->line = pfile->directive_line; | |
1855 macro->params = 0; | |
1856 macro->paramc = 0; | |
1857 macro->variadic = 0; | |
1858 macro->used = !CPP_OPTION (pfile, warn_unused_macros); | |
1859 macro->count = 0; | |
1860 macro->fun_like = 0; | |
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1861 macro->extra_tokens = 0; |
0 | 1862 /* To suppress some diagnostics. */ |
1863 macro->syshdr = pfile->buffer && pfile->buffer->sysp != 0; | |
1864 | |
1865 if (CPP_OPTION (pfile, traditional)) | |
1866 ok = _cpp_create_trad_definition (pfile, macro); | |
1867 else | |
1868 { | |
1869 ok = create_iso_definition (pfile, macro); | |
1870 | |
1871 /* We set the type for SEEN_EOL() in directives.c. | |
1872 | |
1873 Longer term we should lex the whole line before coming here, | |
1874 and just copy the expansion. */ | |
1875 | |
1876 /* Stop the lexer accepting __VA_ARGS__. */ | |
1877 pfile->state.va_args_ok = 0; | |
1878 } | |
1879 | |
1880 /* Clear the fast argument lookup indices. */ | |
1881 for (i = macro->paramc; i-- > 0; ) | |
1882 { | |
1883 struct cpp_hashnode *node = macro->params[i]; | |
1884 node->flags &= ~ NODE_MACRO_ARG; | |
1885 node->value = ((union _cpp_hashnode_value *) pfile->macro_buffer)[i]; | |
1886 } | |
1887 | |
1888 if (!ok) | |
1889 return ok; | |
1890 | |
1891 if (node->type == NT_MACRO) | |
1892 { | |
1893 if (CPP_OPTION (pfile, warn_unused_macros)) | |
1894 _cpp_warn_if_unused_macro (pfile, node, NULL); | |
1895 | |
1896 if (warn_of_redefinition (pfile, node, macro)) | |
1897 { | |
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1898 const int reason = (node->flags & NODE_BUILTIN) |
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1899 ? CPP_W_BUILTIN_MACRO_REDEFINED : CPP_W_NONE; |
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1900 bool warned; |
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1901 |
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1902 warned = cpp_pedwarning_with_line (pfile, reason, |
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1903 pfile->directive_line, 0, |
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1904 "\"%s\" redefined", |
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1905 NODE_NAME (node)); |
0 | 1906 |
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1907 if (warned && node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) |
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1908 cpp_error_with_line (pfile, CPP_DL_NOTE, |
0 | 1909 node->value.macro->line, 0, |
1910 "this is the location of the previous definition"); | |
1911 } | |
1912 } | |
1913 | |
1914 if (node->type != NT_VOID) | |
1915 _cpp_free_definition (node); | |
1916 | |
1917 /* Enter definition in hash table. */ | |
1918 node->type = NT_MACRO; | |
1919 node->value.macro = macro; | |
1920 if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_")) | |
1921 && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_FORMAT_MACROS") | |
1922 /* __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS are mentioned | |
1923 in the C standard, as something that one must use in C++. | |
1924 However DR#593 indicates that these aren't actually mentioned | |
1925 in the C++ standard. We special-case them anyway. */ | |
1926 && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_LIMIT_MACROS") | |
1927 && ustrcmp (NODE_NAME (node), (const uchar *) "__STDC_CONSTANT_MACROS")) | |
1928 node->flags |= NODE_WARN; | |
1929 | |
1930 /* If user defines one of the conditional macros, remove the | |
1931 conditional flag */ | |
1932 node->flags &= ~NODE_CONDITIONAL; | |
1933 | |
1934 return ok; | |
1935 } | |
1936 | |
1937 /* Warn if a token in STRING matches one of a function-like MACRO's | |
1938 parameters. */ | |
1939 static void | |
1940 check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro, | |
1941 const cpp_string *string) | |
1942 { | |
1943 unsigned int i, len; | |
1944 const uchar *p, *q, *limit; | |
1945 | |
1946 /* Loop over the string. */ | |
1947 limit = string->text + string->len - 1; | |
1948 for (p = string->text + 1; p < limit; p = q) | |
1949 { | |
1950 /* Find the start of an identifier. */ | |
1951 while (p < limit && !is_idstart (*p)) | |
1952 p++; | |
1953 | |
1954 /* Find the end of the identifier. */ | |
1955 q = p; | |
1956 while (q < limit && is_idchar (*q)) | |
1957 q++; | |
1958 | |
1959 len = q - p; | |
1960 | |
1961 /* Loop over the function macro arguments to see if the | |
1962 identifier inside the string matches one of them. */ | |
1963 for (i = 0; i < macro->paramc; i++) | |
1964 { | |
1965 const cpp_hashnode *node = macro->params[i]; | |
1966 | |
1967 if (NODE_LEN (node) == len | |
1968 && !memcmp (p, NODE_NAME (node), len)) | |
1969 { | |
1970 cpp_error (pfile, CPP_DL_WARNING, | |
1971 "macro argument \"%s\" would be stringified in traditional C", | |
1972 NODE_NAME (node)); | |
1973 break; | |
1974 } | |
1975 } | |
1976 } | |
1977 } | |
1978 | |
1979 /* Returns the name, arguments and expansion of a macro, in a format | |
1980 suitable to be read back in again, and therefore also for DWARF 2 | |
1981 debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". | |
1982 Caller is expected to generate the "#define" bit if needed. The | |
1983 returned text is temporary, and automatically freed later. */ | |
1984 const unsigned char * | |
1985 cpp_macro_definition (cpp_reader *pfile, const cpp_hashnode *node) | |
1986 { | |
1987 unsigned int i, len; | |
1988 const cpp_macro *macro = node->value.macro; | |
1989 unsigned char *buffer; | |
1990 | |
1991 if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) | |
1992 { | |
1993 cpp_error (pfile, CPP_DL_ICE, | |
1994 "invalid hash type %d in cpp_macro_definition", node->type); | |
1995 return 0; | |
1996 } | |
1997 | |
1998 /* Calculate length. */ | |
1999 len = NODE_LEN (node) + 2; /* ' ' and NUL. */ | |
2000 if (macro->fun_like) | |
2001 { | |
2002 len += 4; /* "()" plus possible final ".." of named | |
2003 varargs (we have + 1 below). */ | |
2004 for (i = 0; i < macro->paramc; i++) | |
2005 len += NODE_LEN (macro->params[i]) + 1; /* "," */ | |
2006 } | |
2007 | |
2008 /* This should match below where we fill in the buffer. */ | |
2009 if (CPP_OPTION (pfile, traditional)) | |
2010 len += _cpp_replacement_text_len (macro); | |
2011 else | |
2012 { | |
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2013 unsigned int count = macro_real_token_count (macro); |
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2014 for (i = 0; i < count; i++) |
0 | 2015 { |
2016 cpp_token *token = ¯o->exp.tokens[i]; | |
2017 | |
2018 if (token->type == CPP_MACRO_ARG) | |
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2019 len += NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1]); |
0 | 2020 else |
2021 len += cpp_token_len (token); | |
2022 | |
2023 if (token->flags & STRINGIFY_ARG) | |
2024 len++; /* "#" */ | |
2025 if (token->flags & PASTE_LEFT) | |
2026 len += 3; /* " ##" */ | |
2027 if (token->flags & PREV_WHITE) | |
2028 len++; /* " " */ | |
2029 } | |
2030 } | |
2031 | |
2032 if (len > pfile->macro_buffer_len) | |
2033 { | |
2034 pfile->macro_buffer = XRESIZEVEC (unsigned char, | |
2035 pfile->macro_buffer, len); | |
2036 pfile->macro_buffer_len = len; | |
2037 } | |
2038 | |
2039 /* Fill in the buffer. Start with the macro name. */ | |
2040 buffer = pfile->macro_buffer; | |
2041 memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); | |
2042 buffer += NODE_LEN (node); | |
2043 | |
2044 /* Parameter names. */ | |
2045 if (macro->fun_like) | |
2046 { | |
2047 *buffer++ = '('; | |
2048 for (i = 0; i < macro->paramc; i++) | |
2049 { | |
2050 cpp_hashnode *param = macro->params[i]; | |
2051 | |
2052 if (param != pfile->spec_nodes.n__VA_ARGS__) | |
2053 { | |
2054 memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); | |
2055 buffer += NODE_LEN (param); | |
2056 } | |
2057 | |
2058 if (i + 1 < macro->paramc) | |
2059 /* Don't emit a space after the comma here; we're trying | |
2060 to emit a Dwarf-friendly definition, and the Dwarf spec | |
2061 forbids spaces in the argument list. */ | |
2062 *buffer++ = ','; | |
2063 else if (macro->variadic) | |
2064 *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; | |
2065 } | |
2066 *buffer++ = ')'; | |
2067 } | |
2068 | |
2069 /* The Dwarf spec requires a space after the macro name, even if the | |
2070 definition is the empty string. */ | |
2071 *buffer++ = ' '; | |
2072 | |
2073 if (CPP_OPTION (pfile, traditional)) | |
2074 buffer = _cpp_copy_replacement_text (macro, buffer); | |
2075 else if (macro->count) | |
2076 /* Expansion tokens. */ | |
2077 { | |
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2078 unsigned int count = macro_real_token_count (macro); |
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2079 for (i = 0; i < count; i++) |
0 | 2080 { |
2081 cpp_token *token = ¯o->exp.tokens[i]; | |
2082 | |
2083 if (token->flags & PREV_WHITE) | |
2084 *buffer++ = ' '; | |
2085 if (token->flags & STRINGIFY_ARG) | |
2086 *buffer++ = '#'; | |
2087 | |
2088 if (token->type == CPP_MACRO_ARG) | |
2089 { | |
2090 memcpy (buffer, | |
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2091 NODE_NAME (macro->params[token->val.macro_arg.arg_no - 1]), |
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2092 NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1])); |
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2093 buffer += NODE_LEN (macro->params[token->val.macro_arg.arg_no - 1]); |
0 | 2094 } |
2095 else | |
2096 buffer = cpp_spell_token (pfile, token, buffer, false); | |
2097 | |
2098 if (token->flags & PASTE_LEFT) | |
2099 { | |
2100 *buffer++ = ' '; | |
2101 *buffer++ = '#'; | |
2102 *buffer++ = '#'; | |
2103 /* Next has PREV_WHITE; see _cpp_create_definition. */ | |
2104 } | |
2105 } | |
2106 } | |
2107 | |
2108 *buffer = '\0'; | |
2109 return pfile->macro_buffer; | |
2110 } |