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79bd622b | 1 | /* Part of CPP library. (Macro and #define handling.) |
69461e0d | 2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998, |
a8349c62 | 3 | 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
69461e0d | 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" | |
d856c8a6 | 29 | #include "internal.h" |
69461e0d | 30 | |
79bd622b | 31 | typedef struct macro_arg macro_arg; |
32 | struct macro_arg | |
33 | { | |
f9b5f742 | 34 | const cpp_token **first; /* First token in unexpanded argument. */ |
1e625a2e | 35 | const cpp_token **expanded; /* Macro-expanded argument. */ |
f9b5f742 | 36 | const cpp_token *stringified; /* Stringified argument. */ |
79bd622b | 37 | unsigned int count; /* # of tokens in argument. */ |
38 | unsigned int expanded_count; /* # of tokens in expanded argument. */ | |
69461e0d | 39 | }; |
40 | ||
79bd622b | 41 | /* Macro expansion. */ |
42 | ||
f7fdd7a1 | 43 | static int enter_macro_context (cpp_reader *, cpp_hashnode *); |
44 | static int builtin_macro (cpp_reader *, cpp_hashnode *); | |
45 | static void push_token_context (cpp_reader *, cpp_hashnode *, | |
46 | const cpp_token *, unsigned int); | |
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 | static cpp_context *next_context (cpp_reader *); | |
51 | static const cpp_token *padding_token (cpp_reader *, const cpp_token *); | |
52 | static void expand_arg (cpp_reader *, macro_arg *); | |
53 | static const cpp_token *new_string_token (cpp_reader *, uchar *, unsigned int); | |
54 | static const cpp_token *stringify_arg (cpp_reader *, macro_arg *); | |
55 | static void paste_all_tokens (cpp_reader *, const cpp_token *); | |
56 | static bool paste_tokens (cpp_reader *, const cpp_token **, const cpp_token *); | |
57 | static void replace_args (cpp_reader *, cpp_hashnode *, cpp_macro *, | |
58 | macro_arg *); | |
59 | static _cpp_buff *funlike_invocation_p (cpp_reader *, cpp_hashnode *); | |
60 | static bool create_iso_definition (cpp_reader *, cpp_macro *); | |
79bd622b | 61 | |
79bd622b | 62 | /* #define directive parsing and handling. */ |
63 | ||
f7fdd7a1 | 64 | static cpp_token *alloc_expansion_token (cpp_reader *, cpp_macro *); |
65 | static cpp_token *lex_expansion_token (cpp_reader *, cpp_macro *); | |
66 | static bool warn_of_redefinition (cpp_reader *, const cpp_hashnode *, | |
67 | const cpp_macro *); | |
68 | static bool parse_params (cpp_reader *, cpp_macro *); | |
69 | static void check_trad_stringification (cpp_reader *, const cpp_macro *, | |
70 | const cpp_string *); | |
69461e0d | 71 | |
71a7c282 | 72 | /* Emits a warning if NODE is a macro defined in the main file that |
73 | has not been used. */ | |
74 | int | |
f7fdd7a1 | 75 | _cpp_warn_if_unused_macro (cpp_reader *pfile, cpp_hashnode *node, |
76 | void *v ATTRIBUTE_UNUSED) | |
71a7c282 | 77 | { |
78 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) | |
79 | { | |
80 | cpp_macro *macro = node->value.macro; | |
81 | ||
82 | if (!macro->used | |
ceec9c13 | 83 | && MAIN_FILE_P (linemap_lookup (pfile->line_table, macro->line))) |
d80d2074 | 84 | cpp_error_with_line (pfile, CPP_DL_WARNING, macro->line, 0, |
71a7c282 | 85 | "macro \"%s\" is not used", NODE_NAME (node)); |
86 | } | |
87 | ||
88 | return 1; | |
89 | } | |
90 | ||
f9b5f742 | 91 | /* Allocates and returns a CPP_STRING token, containing TEXT of length |
92 | LEN, after null-terminating it. TEXT must be in permanent storage. */ | |
93 | static const cpp_token * | |
f7fdd7a1 | 94 | new_string_token (cpp_reader *pfile, unsigned char *text, unsigned int len) |
79bd622b | 95 | { |
f9b5f742 | 96 | cpp_token *token = _cpp_temp_token (pfile); |
79bd622b | 97 | |
f9b5f742 | 98 | text[len] = '\0'; |
79bd622b | 99 | token->type = CPP_STRING; |
f9b5f742 | 100 | token->val.str.len = len; |
101 | token->val.str.text = text; | |
79bd622b | 102 | token->flags = 0; |
f9b5f742 | 103 | return token; |
79bd622b | 104 | } |
105 | ||
79bd622b | 106 | static const char * const monthnames[] = |
107 | { | |
108 | "Jan", "Feb", "Mar", "Apr", "May", "Jun", | |
109 | "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" | |
110 | }; | |
111 | ||
d6d3c909 | 112 | /* Helper function for builtin_macro. Returns the text generated by |
113 | a builtin macro. */ | |
9c343313 | 114 | const uchar * |
f7fdd7a1 | 115 | _cpp_builtin_macro_text (cpp_reader *pfile, cpp_hashnode *node) |
79bd622b | 116 | { |
610625e3 | 117 | const struct line_map *map; |
9c343313 | 118 | const uchar *result = NULL; |
119 | unsigned int number = 1; | |
c7e5d924 | 120 | |
79bd622b | 121 | switch (node->value.builtin) |
122 | { | |
f9b5f742 | 123 | default: |
d80d2074 | 124 | cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", |
73328dce | 125 | NODE_NAME (node)); |
9c343313 | 126 | break; |
f9b5f742 | 127 | |
79bd622b | 128 | case BT_FILE: |
129 | case BT_BASE_FILE: | |
69461e0d | 130 | { |
f9b5f742 | 131 | unsigned int len; |
6cee4464 | 132 | const char *name; |
b6d18b0a | 133 | uchar *buf; |
dbddc569 | 134 | map = linemap_lookup (pfile->line_table, pfile->line_table->highest_line); |
6cee4464 | 135 | |
136 | if (node->value.builtin == BT_BASE_FILE) | |
5a9f87bb | 137 | while (! MAIN_FILE_P (map)) |
ceec9c13 | 138 | map = INCLUDED_FROM (pfile->line_table, map); |
6cee4464 | 139 | |
5a9f87bb | 140 | name = map->to_file; |
f9b5f742 | 141 | len = strlen (name); |
9c343313 | 142 | buf = _cpp_unaligned_alloc (pfile, len * 4 + 3); |
143 | result = buf; | |
144 | *buf = '"'; | |
145 | buf = cpp_quote_string (buf + 1, (const unsigned char *) name, len); | |
146 | *buf++ = '"'; | |
147 | *buf = '\0'; | |
69461e0d | 148 | } |
c7e5d924 | 149 | break; |
150 | ||
79bd622b | 151 | case BT_INCLUDE_LEVEL: |
4087823d | 152 | /* The line map depth counts the primary source as level 1, but |
153 | historically __INCLUDE_DEPTH__ has called the primary source | |
154 | level 0. */ | |
ceec9c13 | 155 | number = pfile->line_table->depth - 1; |
c7e5d924 | 156 | break; |
79bd622b | 157 | |
158 | case BT_SPECLINE: | |
dbddc569 | 159 | map = &pfile->line_table->maps[pfile->line_table->used-1]; |
79bd622b | 160 | /* If __LINE__ is embedded in a macro, it must expand to the |
161 | line of the macro's invocation, not its definition. | |
162 | Otherwise things like assert() will not work properly. */ | |
9c343313 | 163 | if (CPP_OPTION (pfile, traditional)) |
dbddc569 | 164 | number = pfile->line_table->highest_line; |
9c343313 | 165 | else |
610625e3 | 166 | number = pfile->cur_token[-1].src_loc; |
167 | number = SOURCE_LINE (map, number); | |
c7e5d924 | 168 | break; |
79bd622b | 169 | |
63994318 | 170 | /* __STDC__ has the value 1 under normal circumstances. |
171 | However, if (a) we are in a system header, (b) the option | |
965e9876 | 172 | stdc_0_in_system_headers is true (set by target config), and |
173 | (c) we are not in strictly conforming mode, then it has the | |
174 | value 0. */ | |
79bd622b | 175 | case BT_STDC: |
176 | { | |
610625e3 | 177 | if (cpp_in_system_header (pfile) |
63994318 | 178 | && CPP_OPTION (pfile, stdc_0_in_system_headers) |
ed909a09 | 179 | && !CPP_OPTION (pfile,std)) |
9c343313 | 180 | number = 0; |
63994318 | 181 | else |
9c343313 | 182 | number = 1; |
79bd622b | 183 | } |
c7e5d924 | 184 | break; |
69461e0d | 185 | |
79bd622b | 186 | case BT_DATE: |
187 | case BT_TIME: | |
9c343313 | 188 | if (pfile->date == NULL) |
79bd622b | 189 | { |
f9b5f742 | 190 | /* Allocate __DATE__ and __TIME__ strings from permanent |
191 | storage. We only do this once, and don't generate them | |
192 | at init time, because time() and localtime() are very | |
193 | slow on some systems. */ | |
3385506f | 194 | time_t tt; |
195 | struct tm *tb = NULL; | |
196 | ||
197 | /* (time_t) -1 is a legitimate value for "number of seconds | |
198 | since the Epoch", so we have to do a little dance to | |
199 | distinguish that from a genuine error. */ | |
200 | errno = 0; | |
201 | tt = time(NULL); | |
202 | if (tt != (time_t)-1 || errno == 0) | |
203 | tb = localtime (&tt); | |
204 | ||
205 | if (tb) | |
206 | { | |
207 | pfile->date = _cpp_unaligned_alloc (pfile, | |
208 | sizeof ("\"Oct 11 1347\"")); | |
209 | sprintf ((char *) pfile->date, "\"%s %2d %4d\"", | |
f7fdd7a1 | 210 | monthnames[tb->tm_mon], tb->tm_mday, |
211 | tb->tm_year + 1900); | |
3385506f | 212 | |
213 | pfile->time = _cpp_unaligned_alloc (pfile, | |
214 | sizeof ("\"12:34:56\"")); | |
215 | sprintf ((char *) pfile->time, "\"%02d:%02d:%02d\"", | |
216 | tb->tm_hour, tb->tm_min, tb->tm_sec); | |
217 | } | |
218 | else | |
219 | { | |
d80d2074 | 220 | cpp_errno (pfile, CPP_DL_WARNING, |
3385506f | 221 | "could not determine date and time"); |
222 | ||
223 | pfile->date = U"\"??? ?? ????\""; | |
224 | pfile->time = U"\"??:??:??\""; | |
225 | } | |
79bd622b | 226 | } |
79bd622b | 227 | |
c7e5d924 | 228 | if (node->value.builtin == BT_DATE) |
9c343313 | 229 | result = pfile->date; |
c7e5d924 | 230 | else |
9c343313 | 231 | result = pfile->time; |
c7e5d924 | 232 | break; |
9c343313 | 233 | } |
234 | ||
235 | if (result == NULL) | |
236 | { | |
237 | /* 21 bytes holds all NUL-terminated unsigned 64-bit numbers. */ | |
238 | result = _cpp_unaligned_alloc (pfile, 21); | |
239 | sprintf ((char *) result, "%u", number); | |
240 | } | |
241 | ||
242 | return result; | |
243 | } | |
244 | ||
245 | /* Convert builtin macros like __FILE__ to a token and push it on the | |
d6d3c909 | 246 | context stack. Also handles _Pragma, for which a new token may not |
247 | be created. Returns 1 if it generates a new token context, 0 to | |
9c343313 | 248 | return the token to the caller. */ |
249 | static int | |
f7fdd7a1 | 250 | builtin_macro (cpp_reader *pfile, cpp_hashnode *node) |
9c343313 | 251 | { |
252 | const uchar *buf; | |
a54e0bf8 | 253 | size_t len; |
254 | char *nbuf; | |
c7e5d924 | 255 | |
9c343313 | 256 | if (node->value.builtin == BT_PRAGMA) |
257 | { | |
c7e5d924 | 258 | /* Don't interpret _Pragma within directives. The standard is |
259 | not clear on this, but to me this makes most sense. */ | |
260 | if (pfile->state.in_directive) | |
261 | return 0; | |
262 | ||
263 | _cpp_do__Pragma (pfile); | |
d6d3c909 | 264 | if (pfile->directive_result.type == CPP_PRAGMA) |
265 | { | |
266 | cpp_token *tok = _cpp_temp_token (pfile); | |
267 | *tok = pfile->directive_result; | |
268 | push_token_context (pfile, NULL, tok, 1); | |
269 | } | |
270 | ||
c7e5d924 | 271 | return 1; |
79bd622b | 272 | } |
c7e5d924 | 273 | |
9c343313 | 274 | buf = _cpp_builtin_macro_text (pfile, node); |
a54e0bf8 | 275 | len = ustrlen (buf); |
276 | nbuf = alloca (len + 1); | |
277 | memcpy (nbuf, buf, len); | |
278 | nbuf[len]='\n'; | |
9c343313 | 279 | |
9eb74666 | 280 | cpp_push_buffer (pfile, (uchar *) nbuf, len, /* from_stage3 */ true); |
a54e0bf8 | 281 | _cpp_clean_line (pfile); |
9c343313 | 282 | |
283 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
284 | pfile->cur_token = _cpp_temp_token (pfile); | |
285 | push_token_context (pfile, NULL, _cpp_lex_direct (pfile), 1); | |
286 | if (pfile->buffer->cur != pfile->buffer->rlimit) | |
d80d2074 | 287 | cpp_error (pfile, CPP_DL_ICE, "invalid built-in macro \"%s\"", |
9c343313 | 288 | NODE_NAME (node)); |
289 | _cpp_pop_buffer (pfile); | |
290 | ||
c7e5d924 | 291 | return 1; |
69461e0d | 292 | } |
293 | ||
88cf66fa | 294 | /* Copies SRC, of length LEN, to DEST, adding backslashes before all |
295 | backslashes and double quotes. Non-printable characters are | |
25266990 | 296 | converted to octal. DEST must be of sufficient size. Returns |
297 | a pointer to the end of the string. */ | |
b6d18b0a | 298 | uchar * |
f7fdd7a1 | 299 | cpp_quote_string (uchar *dest, const uchar *src, unsigned int len) |
79bd622b | 300 | { |
301 | while (len--) | |
302 | { | |
b6d18b0a | 303 | uchar c = *src++; |
69461e0d | 304 | |
79bd622b | 305 | if (c == '\\' || c == '"') |
306 | { | |
307 | *dest++ = '\\'; | |
308 | *dest++ = c; | |
309 | } | |
310 | else | |
311 | { | |
312 | if (ISPRINT (c)) | |
313 | *dest++ = c; | |
314 | else | |
69461e0d | 315 | { |
79bd622b | 316 | sprintf ((char *) dest, "\\%03o", c); |
317 | dest += 4; | |
69461e0d | 318 | } |
79bd622b | 319 | } |
320 | } | |
69461e0d | 321 | |
79bd622b | 322 | return dest; |
323 | } | |
69461e0d | 324 | |
88cf66fa | 325 | /* Convert a token sequence ARG to a single string token according to |
326 | the rules of the ISO C #-operator. */ | |
f9b5f742 | 327 | static const cpp_token * |
f7fdd7a1 | 328 | stringify_arg (cpp_reader *pfile, macro_arg *arg) |
79bd622b | 329 | { |
4970d4c2 | 330 | unsigned char *dest; |
1fdf6039 | 331 | unsigned int i, escape_it, backslash_count = 0; |
f9b5f742 | 332 | const cpp_token *source = NULL; |
1fdf6039 | 333 | size_t len; |
69461e0d | 334 | |
4970d4c2 | 335 | if (BUFF_ROOM (pfile->u_buff) < 3) |
336 | _cpp_extend_buff (pfile, &pfile->u_buff, 3); | |
337 | dest = BUFF_FRONT (pfile->u_buff); | |
338 | *dest++ = '"'; | |
339 | ||
79bd622b | 340 | /* Loop, reading in the argument's tokens. */ |
341 | for (i = 0; i < arg->count; i++) | |
342 | { | |
f9b5f742 | 343 | const cpp_token *token = arg->first[i]; |
f9b5f742 | 344 | |
345 | if (token->type == CPP_PADDING) | |
346 | { | |
347 | if (source == NULL) | |
348 | source = token->val.source; | |
349 | continue; | |
350 | } | |
69461e0d | 351 | |
79bd622b | 352 | escape_it = (token->type == CPP_STRING || token->type == CPP_WSTRING |
9ee99ac6 | 353 | || token->type == CPP_CHAR || token->type == CPP_WCHAR); |
69461e0d | 354 | |
1fdf6039 | 355 | /* Room for each char being written in octal, initial space and |
4970d4c2 | 356 | final quote and NUL. */ |
f9b5f742 | 357 | len = cpp_token_len (token); |
79bd622b | 358 | if (escape_it) |
79bd622b | 359 | len *= 4; |
4970d4c2 | 360 | len += 3; |
69461e0d | 361 | |
1fdf6039 | 362 | if ((size_t) (BUFF_LIMIT (pfile->u_buff) - dest) < len) |
79bd622b | 363 | { |
1fdf6039 | 364 | size_t len_so_far = dest - BUFF_FRONT (pfile->u_buff); |
e6a5f963 | 365 | _cpp_extend_buff (pfile, &pfile->u_buff, len); |
1fdf6039 | 366 | dest = BUFF_FRONT (pfile->u_buff) + len_so_far; |
79bd622b | 367 | } |
69461e0d | 368 | |
f9b5f742 | 369 | /* Leading white space? */ |
4970d4c2 | 370 | if (dest - 1 != BUFF_FRONT (pfile->u_buff)) |
f9b5f742 | 371 | { |
372 | if (source == NULL) | |
373 | source = token; | |
374 | if (source->flags & PREV_WHITE) | |
375 | *dest++ = ' '; | |
376 | } | |
377 | source = NULL; | |
69461e0d | 378 | |
79bd622b | 379 | if (escape_it) |
380 | { | |
1fdf6039 | 381 | _cpp_buff *buff = _cpp_get_buff (pfile, len); |
382 | unsigned char *buf = BUFF_FRONT (buff); | |
79bd622b | 383 | len = cpp_spell_token (pfile, token, buf) - buf; |
25266990 | 384 | dest = cpp_quote_string (dest, buf, len); |
1fdf6039 | 385 | _cpp_release_buff (pfile, buff); |
79bd622b | 386 | } |
387 | else | |
388 | dest = cpp_spell_token (pfile, token, dest); | |
79bd622b | 389 | |
bc205914 | 390 | if (token->type == CPP_OTHER && token->val.str.text[0] == '\\') |
79bd622b | 391 | backslash_count++; |
392 | else | |
393 | backslash_count = 0; | |
394 | } | |
395 | ||
396 | /* Ignore the final \ of invalid string literals. */ | |
397 | if (backslash_count & 1) | |
398 | { | |
d80d2074 | 399 | cpp_error (pfile, CPP_DL_WARNING, |
73328dce | 400 | "invalid string literal, ignoring final '\\'"); |
1fdf6039 | 401 | dest--; |
79bd622b | 402 | } |
403 | ||
f9b5f742 | 404 | /* Commit the memory, including NUL, and return the token. */ |
4970d4c2 | 405 | *dest++ = '"'; |
1fdf6039 | 406 | len = dest - BUFF_FRONT (pfile->u_buff); |
407 | BUFF_FRONT (pfile->u_buff) = dest + 1; | |
408 | return new_string_token (pfile, dest - len, len); | |
79bd622b | 409 | } |
410 | ||
d10cfa8d | 411 | /* Try to paste two tokens. On success, return nonzero. In any |
1785b647 | 412 | case, PLHS is updated to point to the pasted token, which is |
413 | guaranteed to not have the PASTE_LEFT flag set. */ | |
414 | static bool | |
f7fdd7a1 | 415 | paste_tokens (cpp_reader *pfile, const cpp_token **plhs, const cpp_token *rhs) |
08138c65 | 416 | { |
1785b647 | 417 | unsigned char *buf, *end; |
418 | const cpp_token *lhs; | |
419 | unsigned int len; | |
420 | bool valid; | |
421 | ||
422 | lhs = *plhs; | |
423 | len = cpp_token_len (lhs) + cpp_token_len (rhs) + 1; | |
f0af5a88 | 424 | buf = alloca (len); |
1785b647 | 425 | end = cpp_spell_token (pfile, lhs, buf); |
426 | ||
427 | /* Avoid comment headers, since they are still processed in stage 3. | |
428 | It is simpler to insert a space here, rather than modifying the | |
429 | lexer to ignore comments in some circumstances. Simply returning | |
430 | false doesn't work, since we want to clear the PASTE_LEFT flag. */ | |
bc5dbce5 | 431 | if (lhs->type == CPP_DIV && rhs->type != CPP_EQ) |
1785b647 | 432 | *end++ = ' '; |
433 | end = cpp_spell_token (pfile, rhs, end); | |
a54e0bf8 | 434 | *end = '\n'; |
1785b647 | 435 | |
9eb74666 | 436 | cpp_push_buffer (pfile, buf, end - buf, /* from_stage3 */ true); |
a54e0bf8 | 437 | _cpp_clean_line (pfile); |
1785b647 | 438 | |
439 | /* Set pfile->cur_token as required by _cpp_lex_direct. */ | |
440 | pfile->cur_token = _cpp_temp_token (pfile); | |
441 | *plhs = _cpp_lex_direct (pfile); | |
1c124f85 | 442 | valid = pfile->buffer->cur == pfile->buffer->rlimit; |
1785b647 | 443 | _cpp_pop_buffer (pfile); |
444 | ||
445 | return valid; | |
08138c65 | 446 | } |
447 | ||
88cf66fa | 448 | /* Handles an arbitrarily long sequence of ## operators, with initial |
449 | operand LHS. This implementation is left-associative, | |
450 | non-recursive, and finishes a paste before handling succeeding | |
451 | ones. If a paste fails, we back up to the RHS of the failing ## | |
452 | operator before pushing the context containing the result of prior | |
453 | successful pastes, with the effect that the RHS appears in the | |
454 | output stream after the pasted LHS normally. */ | |
79bd622b | 455 | static void |
f7fdd7a1 | 456 | paste_all_tokens (cpp_reader *pfile, const cpp_token *lhs) |
79bd622b | 457 | { |
f9b5f742 | 458 | const cpp_token *rhs; |
459 | cpp_context *context = pfile->context; | |
460 | ||
79bd622b | 461 | do |
462 | { | |
463 | /* Take the token directly from the current context. We can do | |
464 | this, because we are in the replacement list of either an | |
465 | object-like macro, or a function-like macro with arguments | |
466 | inserted. In either case, the constraints to #define | |
08138c65 | 467 | guarantee we have at least one more token. */ |
f9b5f742 | 468 | if (context->direct_p) |
a854276a | 469 | rhs = FIRST (context).token++; |
f9b5f742 | 470 | else |
a854276a | 471 | rhs = *FIRST (context).ptoken++; |
f9b5f742 | 472 | |
473 | if (rhs->type == CPP_PADDING) | |
474 | abort (); | |
475 | ||
1785b647 | 476 | if (!paste_tokens (pfile, &lhs, rhs)) |
79bd622b | 477 | { |
f9b5f742 | 478 | _cpp_backup_tokens (pfile, 1); |
1785b647 | 479 | |
8e1db61c | 480 | /* Mandatory error for all apart from assembler. */ |
1785b647 | 481 | if (CPP_OPTION (pfile, lang) != CLK_ASM) |
d80d2074 | 482 | cpp_error (pfile, CPP_DL_ERROR, |
1785b647 | 483 | "pasting \"%s\" and \"%s\" does not give a valid preprocessing token", |
73328dce | 484 | cpp_token_as_text (pfile, lhs), |
485 | cpp_token_as_text (pfile, rhs)); | |
3c7df4d3 | 486 | break; |
79bd622b | 487 | } |
79bd622b | 488 | } |
489 | while (rhs->flags & PASTE_LEFT); | |
490 | ||
1785b647 | 491 | /* Put the resulting token in its own context. */ |
492 | push_token_context (pfile, NULL, lhs, 1); | |
79bd622b | 493 | } |
494 | ||
06025647 | 495 | /* Returns TRUE if the number of arguments ARGC supplied in an |
496 | invocation of the MACRO referenced by NODE is valid. An empty | |
497 | invocation to a macro with no parameters should pass ARGC as zero. | |
498 | ||
499 | Note that MACRO cannot necessarily be deduced from NODE, in case | |
500 | NODE was redefined whilst collecting arguments. */ | |
501 | bool | |
f7fdd7a1 | 502 | _cpp_arguments_ok (cpp_reader *pfile, cpp_macro *macro, const cpp_hashnode *node, unsigned int argc) |
06025647 | 503 | { |
504 | if (argc == macro->paramc) | |
505 | return true; | |
506 | ||
507 | if (argc < macro->paramc) | |
508 | { | |
509 | /* As an extension, a rest argument is allowed to not appear in | |
510 | the invocation at all. | |
511 | e.g. #define debug(format, args...) something | |
512 | debug("string"); | |
513 | ||
514 | This is exactly the same as if there had been an empty rest | |
515 | argument - debug("string", ). */ | |
516 | ||
517 | if (argc + 1 == macro->paramc && macro->variadic) | |
518 | { | |
519 | if (CPP_PEDANTIC (pfile) && ! macro->syshdr) | |
d80d2074 | 520 | cpp_error (pfile, CPP_DL_PEDWARN, |
06025647 | 521 | "ISO C99 requires rest arguments to be used"); |
522 | return true; | |
523 | } | |
524 | ||
d80d2074 | 525 | cpp_error (pfile, CPP_DL_ERROR, |
06025647 | 526 | "macro \"%s\" requires %u arguments, but only %u given", |
527 | NODE_NAME (node), macro->paramc, argc); | |
528 | } | |
529 | else | |
d80d2074 | 530 | cpp_error (pfile, CPP_DL_ERROR, |
06025647 | 531 | "macro \"%s\" passed %u arguments, but takes just %u", |
532 | NODE_NAME (node), argc, macro->paramc); | |
533 | ||
534 | return false; | |
535 | } | |
536 | ||
88cf66fa | 537 | /* Reads and returns the arguments to a function-like macro |
538 | invocation. Assumes the opening parenthesis has been processed. | |
539 | If there is an error, emits an appropriate diagnostic and returns | |
540 | NULL. Each argument is terminated by a CPP_EOF token, for the | |
541 | future benefit of expand_arg(). */ | |
06c92cbc | 542 | static _cpp_buff * |
f7fdd7a1 | 543 | collect_args (cpp_reader *pfile, const cpp_hashnode *node) |
79bd622b | 544 | { |
06c92cbc | 545 | _cpp_buff *buff, *base_buff; |
546 | cpp_macro *macro; | |
547 | macro_arg *args, *arg; | |
548 | const cpp_token *token; | |
549 | unsigned int argc; | |
06c92cbc | 550 | |
551 | macro = node->value.macro; | |
552 | if (macro->paramc) | |
553 | argc = macro->paramc; | |
554 | else | |
555 | argc = 1; | |
556 | buff = _cpp_get_buff (pfile, argc * (50 * sizeof (cpp_token *) | |
557 | + sizeof (macro_arg))); | |
558 | base_buff = buff; | |
559 | args = (macro_arg *) buff->base; | |
560 | memset (args, 0, argc * sizeof (macro_arg)); | |
1fdf6039 | 561 | buff->cur = (unsigned char *) &args[argc]; |
06c92cbc | 562 | arg = args, argc = 0; |
563 | ||
564 | /* Collect the tokens making up each argument. We don't yet know | |
565 | how many arguments have been supplied, whether too many or too | |
566 | few. Hence the slightly bizarre usage of "argc" and "arg". */ | |
567 | do | |
79bd622b | 568 | { |
06c92cbc | 569 | unsigned int paren_depth = 0; |
570 | unsigned int ntokens = 0; | |
79bd622b | 571 | |
06c92cbc | 572 | argc++; |
573 | arg->first = (const cpp_token **) buff->cur; | |
69461e0d | 574 | |
06c92cbc | 575 | for (;;) |
576 | { | |
577 | /* Require space for 2 new tokens (including a CPP_EOF). */ | |
1fdf6039 | 578 | if ((unsigned char *) &arg->first[ntokens + 2] > buff->limit) |
06c92cbc | 579 | { |
e6a5f963 | 580 | buff = _cpp_append_extend_buff (pfile, buff, |
581 | 1000 * sizeof (cpp_token *)); | |
06c92cbc | 582 | arg->first = (const cpp_token **) buff->cur; |
583 | } | |
f9b5f742 | 584 | |
06c92cbc | 585 | token = cpp_get_token (pfile); |
69461e0d | 586 | |
06c92cbc | 587 | if (token->type == CPP_PADDING) |
588 | { | |
589 | /* Drop leading padding. */ | |
590 | if (ntokens == 0) | |
591 | continue; | |
592 | } | |
593 | else if (token->type == CPP_OPEN_PAREN) | |
594 | paren_depth++; | |
595 | else if (token->type == CPP_CLOSE_PAREN) | |
596 | { | |
597 | if (paren_depth-- == 0) | |
598 | break; | |
599 | } | |
600 | else if (token->type == CPP_COMMA) | |
601 | { | |
602 | /* A comma does not terminate an argument within | |
603 | parentheses or as part of a variable argument. */ | |
604 | if (paren_depth == 0 | |
605 | && ! (macro->variadic && argc == macro->paramc)) | |
606 | break; | |
607 | } | |
608 | else if (token->type == CPP_EOF | |
609 | || (token->type == CPP_HASH && token->flags & BOL)) | |
610 | break; | |
79bd622b | 611 | |
06c92cbc | 612 | arg->first[ntokens++] = token; |
613 | } | |
79bd622b | 614 | |
06c92cbc | 615 | /* Drop trailing padding. */ |
616 | while (ntokens > 0 && arg->first[ntokens - 1]->type == CPP_PADDING) | |
617 | ntokens--; | |
79bd622b | 618 | |
06c92cbc | 619 | arg->count = ntokens; |
620 | arg->first[ntokens] = &pfile->eof; | |
79bd622b | 621 | |
06c92cbc | 622 | /* Terminate the argument. Excess arguments loop back and |
623 | overwrite the final legitimate argument, before failing. */ | |
624 | if (argc <= macro->paramc) | |
625 | { | |
1fdf6039 | 626 | buff->cur = (unsigned char *) &arg->first[ntokens + 1]; |
06c92cbc | 627 | if (argc != macro->paramc) |
628 | arg++; | |
629 | } | |
79bd622b | 630 | } |
d6af0368 | 631 | while (token->type != CPP_CLOSE_PAREN && token->type != CPP_EOF); |
79bd622b | 632 | |
d6af0368 | 633 | if (token->type == CPP_EOF) |
79bd622b | 634 | { |
1fdf6039 | 635 | /* We still need the CPP_EOF to end directives, and to end |
636 | pre-expansion of a macro argument. Step back is not | |
637 | unconditional, since we don't want to return a CPP_EOF to our | |
638 | callers at the end of an -include-d file. */ | |
d6af0368 | 639 | if (pfile->context->prev || pfile->state.in_directive) |
06c92cbc | 640 | _cpp_backup_tokens (pfile, 1); |
d80d2074 | 641 | cpp_error (pfile, CPP_DL_ERROR, |
73328dce | 642 | "unterminated argument list invoking macro \"%s\"", |
c86dbc5b | 643 | NODE_NAME (node)); |
79bd622b | 644 | } |
06025647 | 645 | else |
79bd622b | 646 | { |
06025647 | 647 | /* A single empty argument is counted as no argument. */ |
648 | if (argc == 1 && macro->paramc == 0 && args[0].count == 0) | |
649 | argc = 0; | |
650 | if (_cpp_arguments_ok (pfile, macro, node, argc)) | |
ed909a09 | 651 | { |
652 | /* GCC has special semantics for , ## b where b is a varargs | |
653 | parameter: we remove the comma if b was omitted entirely. | |
654 | If b was merely an empty argument, the comma is retained. | |
655 | If the macro takes just one (varargs) parameter, then we | |
656 | retain the comma only if we are standards conforming. | |
657 | ||
658 | If FIRST is NULL replace_args () swallows the comma. */ | |
659 | if (macro->variadic && (argc < macro->paramc | |
660 | || (argc == 1 && args[0].count == 0 | |
661 | && !CPP_OPTION (pfile, std)))) | |
662 | args[macro->paramc - 1].first = NULL; | |
663 | return base_buff; | |
664 | } | |
79bd622b | 665 | } |
666 | ||
06025647 | 667 | /* An error occurred. */ |
06c92cbc | 668 | _cpp_release_buff (pfile, base_buff); |
669 | return NULL; | |
79bd622b | 670 | } |
671 | ||
2b0e25fe | 672 | /* Search for an opening parenthesis to the macro of NODE, in such a |
673 | way that, if none is found, we don't lose the information in any | |
674 | intervening padding tokens. If we find the parenthesis, collect | |
675 | the arguments and return the buffer containing them. */ | |
676 | static _cpp_buff * | |
f7fdd7a1 | 677 | funlike_invocation_p (cpp_reader *pfile, cpp_hashnode *node) |
79bd622b | 678 | { |
2b0e25fe | 679 | const cpp_token *token, *padding = NULL; |
f9b5f742 | 680 | |
2b0e25fe | 681 | for (;;) |
fb5ab82c | 682 | { |
2b0e25fe | 683 | token = cpp_get_token (pfile); |
684 | if (token->type != CPP_PADDING) | |
685 | break; | |
686 | if (padding == NULL | |
687 | || (!(padding->flags & PREV_WHITE) && token->val.source == NULL)) | |
688 | padding = token; | |
fb5ab82c | 689 | } |
79bd622b | 690 | |
2b0e25fe | 691 | if (token->type == CPP_OPEN_PAREN) |
79bd622b | 692 | { |
2b0e25fe | 693 | pfile->state.parsing_args = 2; |
694 | return collect_args (pfile, node); | |
79bd622b | 695 | } |
696 | ||
7e2fc40e | 697 | /* CPP_EOF can be the end of macro arguments, or the end of the |
698 | file. We mustn't back up over the latter. Ugh. */ | |
699 | if (token->type != CPP_EOF || token == &pfile->eof) | |
700 | { | |
701 | /* Back up. We may have skipped padding, in which case backing | |
702 | up more than one token when expanding macros is in general | |
703 | too difficult. We re-insert it in its own context. */ | |
704 | _cpp_backup_tokens (pfile, 1); | |
705 | if (padding) | |
706 | push_token_context (pfile, NULL, padding, 1); | |
707 | } | |
2b0e25fe | 708 | |
709 | return NULL; | |
79bd622b | 710 | } |
711 | ||
88cf66fa | 712 | /* Push the context of a macro with hash entry NODE onto the context |
713 | stack. If we can successfully expand the macro, we push a context | |
714 | containing its yet-to-be-rescanned replacement list and return one. | |
715 | Otherwise, we don't push a context and return zero. */ | |
69461e0d | 716 | static int |
f7fdd7a1 | 717 | enter_macro_context (cpp_reader *pfile, cpp_hashnode *node) |
69461e0d | 718 | { |
88cf66fa | 719 | /* The presence of a macro invalidates a file's controlling macro. */ |
c7e5d924 | 720 | pfile->mi_valid = false; |
721 | ||
606942e3 | 722 | pfile->state.angled_headers = false; |
723 | ||
88cf66fa | 724 | /* Handle standard macros. */ |
c7e5d924 | 725 | if (! (node->flags & NODE_BUILTIN)) |
69461e0d | 726 | { |
f9b5f742 | 727 | cpp_macro *macro = node->value.macro; |
3c7df4d3 | 728 | |
2b0e25fe | 729 | if (macro->fun_like) |
730 | { | |
731 | _cpp_buff *buff; | |
732 | ||
733 | pfile->state.prevent_expansion++; | |
734 | pfile->keep_tokens++; | |
735 | pfile->state.parsing_args = 1; | |
736 | buff = funlike_invocation_p (pfile, node); | |
737 | pfile->state.parsing_args = 0; | |
738 | pfile->keep_tokens--; | |
739 | pfile->state.prevent_expansion--; | |
740 | ||
741 | if (buff == NULL) | |
742 | { | |
743 | if (CPP_WTRADITIONAL (pfile) && ! node->value.macro->syshdr) | |
d80d2074 | 744 | cpp_error (pfile, CPP_DL_WARNING, |
2b0e25fe | 745 | "function-like macro \"%s\" must be used with arguments in traditional C", |
73328dce | 746 | NODE_NAME (node)); |
2b0e25fe | 747 | |
748 | return 0; | |
749 | } | |
750 | ||
d6af0368 | 751 | if (macro->paramc > 0) |
752 | replace_args (pfile, node, macro, (macro_arg *) buff->base); | |
2b0e25fe | 753 | _cpp_release_buff (pfile, buff); |
754 | } | |
79bd622b | 755 | |
f9b5f742 | 756 | /* Disable the macro within its expansion. */ |
c7e5d924 | 757 | node->flags |= NODE_DISABLED; |
79bd622b | 758 | |
71a7c282 | 759 | macro->used = 1; |
760 | ||
f9b5f742 | 761 | if (macro->paramc == 0) |
672f38da | 762 | push_token_context (pfile, node, macro->exp.tokens, macro->count); |
c7e5d924 | 763 | |
764 | return 1; | |
69461e0d | 765 | } |
c7e5d924 | 766 | |
88cf66fa | 767 | /* Handle built-in macros and the _Pragma operator. */ |
c7e5d924 | 768 | return builtin_macro (pfile, node); |
79bd622b | 769 | } |
770 | ||
88cf66fa | 771 | /* Replace the parameters in a function-like macro of NODE with the |
772 | actual ARGS, and place the result in a newly pushed token context. | |
773 | Expand each argument before replacing, unless it is operated upon | |
774 | by the # or ## operators. */ | |
79bd622b | 775 | static void |
f7fdd7a1 | 776 | replace_args (cpp_reader *pfile, cpp_hashnode *node, cpp_macro *macro, macro_arg *args) |
79bd622b | 777 | { |
778 | unsigned int i, total; | |
779 | const cpp_token *src, *limit; | |
f9b5f742 | 780 | const cpp_token **dest, **first; |
79bd622b | 781 | macro_arg *arg; |
084163dc | 782 | _cpp_buff *buff; |
79bd622b | 783 | |
79bd622b | 784 | /* First, fully macro-expand arguments, calculating the number of |
084163dc | 785 | tokens in the final expansion as we go. The ordering of the if |
786 | statements below is subtle; we must handle stringification before | |
787 | pasting. */ | |
f9b5f742 | 788 | total = macro->count; |
672f38da | 789 | limit = macro->exp.tokens + macro->count; |
f9b5f742 | 790 | |
672f38da | 791 | for (src = macro->exp.tokens; src < limit; src++) |
79bd622b | 792 | if (src->type == CPP_MACRO_ARG) |
793 | { | |
f9b5f742 | 794 | /* Leading and trailing padding tokens. */ |
795 | total += 2; | |
796 | ||
79bd622b | 797 | /* We have an argument. If it is not being stringified or |
798 | pasted it is macro-replaced before insertion. */ | |
33344a1c | 799 | arg = &args[src->val.arg_no - 1]; |
3c7df4d3 | 800 | |
79bd622b | 801 | if (src->flags & STRINGIFY_ARG) |
802 | { | |
803 | if (!arg->stringified) | |
f9b5f742 | 804 | arg->stringified = stringify_arg (pfile, arg); |
79bd622b | 805 | } |
806 | else if ((src->flags & PASTE_LEFT) | |
672f38da | 807 | || (src > macro->exp.tokens && (src[-1].flags & PASTE_LEFT))) |
79bd622b | 808 | total += arg->count - 1; |
809 | else | |
810 | { | |
811 | if (!arg->expanded) | |
f9b5f742 | 812 | expand_arg (pfile, arg); |
79bd622b | 813 | total += arg->expanded_count - 1; |
814 | } | |
815 | } | |
816 | ||
f9b5f742 | 817 | /* Now allocate space for the expansion, copy the tokens and replace |
818 | the arguments. */ | |
084163dc | 819 | buff = _cpp_get_buff (pfile, total * sizeof (cpp_token *)); |
820 | first = (const cpp_token **) buff->base; | |
f9b5f742 | 821 | dest = first; |
79bd622b | 822 | |
672f38da | 823 | for (src = macro->exp.tokens; src < limit; src++) |
f9b5f742 | 824 | { |
825 | unsigned int count; | |
826 | const cpp_token **from, **paste_flag; | |
79bd622b | 827 | |
f9b5f742 | 828 | if (src->type != CPP_MACRO_ARG) |
829 | { | |
830 | *dest++ = src; | |
831 | continue; | |
832 | } | |
79bd622b | 833 | |
f9b5f742 | 834 | paste_flag = 0; |
835 | arg = &args[src->val.arg_no - 1]; | |
836 | if (src->flags & STRINGIFY_ARG) | |
837 | count = 1, from = &arg->stringified; | |
838 | else if (src->flags & PASTE_LEFT) | |
839 | count = arg->count, from = arg->first; | |
672f38da | 840 | else if (src != macro->exp.tokens && (src[-1].flags & PASTE_LEFT)) |
f9b5f742 | 841 | { |
842 | count = arg->count, from = arg->first; | |
843 | if (dest != first) | |
844 | { | |
f9b5f742 | 845 | if (dest[-1]->type == CPP_COMMA |
846 | && macro->variadic | |
847 | && src->val.arg_no == macro->paramc) | |
848 | { | |
ed909a09 | 849 | /* Swallow a pasted comma if from == NULL, otherwise |
850 | drop the paste flag. */ | |
851 | if (from == NULL) | |
f9b5f742 | 852 | dest--; |
853 | else | |
854 | paste_flag = dest - 1; | |
855 | } | |
856 | /* Remove the paste flag if the RHS is a placemarker. */ | |
857 | else if (count == 0) | |
858 | paste_flag = dest - 1; | |
859 | } | |
860 | } | |
861 | else | |
862 | count = arg->expanded_count, from = arg->expanded; | |
3c7df4d3 | 863 | |
f9b5f742 | 864 | /* Padding on the left of an argument (unless RHS of ##). */ |
7825551f | 865 | if ((!pfile->state.in_directive || pfile->state.directive_wants_padding) |
672f38da | 866 | && src != macro->exp.tokens && !(src[-1].flags & PASTE_LEFT)) |
f9b5f742 | 867 | *dest++ = padding_token (pfile, src); |
79bd622b | 868 | |
f9b5f742 | 869 | if (count) |
870 | { | |
871 | memcpy (dest, from, count * sizeof (cpp_token *)); | |
872 | dest += count; | |
79bd622b | 873 | |
f9b5f742 | 874 | /* With a non-empty argument on the LHS of ##, the last |
875 | token should be flagged PASTE_LEFT. */ | |
876 | if (src->flags & PASTE_LEFT) | |
877 | paste_flag = dest - 1; | |
878 | } | |
efdcc728 | 879 | |
f9b5f742 | 880 | /* Avoid paste on RHS (even case count == 0). */ |
881 | if (!pfile->state.in_directive && !(src->flags & PASTE_LEFT)) | |
882 | *dest++ = &pfile->avoid_paste; | |
79bd622b | 883 | |
f9b5f742 | 884 | /* Add a new paste flag, or remove an unwanted one. */ |
885 | if (paste_flag) | |
886 | { | |
887 | cpp_token *token = _cpp_temp_token (pfile); | |
888 | token->type = (*paste_flag)->type; | |
889 | token->val.str = (*paste_flag)->val.str; | |
890 | if (src->flags & PASTE_LEFT) | |
891 | token->flags = (*paste_flag)->flags | PASTE_LEFT; | |
892 | else | |
893 | token->flags = (*paste_flag)->flags & ~PASTE_LEFT; | |
894 | *paste_flag = token; | |
895 | } | |
896 | } | |
3c7df4d3 | 897 | |
79bd622b | 898 | /* Free the expanded arguments. */ |
899 | for (i = 0; i < macro->paramc; i++) | |
f9b5f742 | 900 | if (args[i].expanded) |
901 | free (args[i].expanded); | |
902 | ||
c7e5d924 | 903 | push_ptoken_context (pfile, node, buff, first, dest - first); |
f9b5f742 | 904 | } |
905 | ||
906 | /* Return a special padding token, with padding inherited from SOURCE. */ | |
907 | static const cpp_token * | |
f7fdd7a1 | 908 | padding_token (cpp_reader *pfile, const cpp_token *source) |
f9b5f742 | 909 | { |
910 | cpp_token *result = _cpp_temp_token (pfile); | |
911 | ||
912 | result->type = CPP_PADDING; | |
913 | result->val.source = source; | |
914 | result->flags = 0; | |
915 | return result; | |
916 | } | |
917 | ||
88cf66fa | 918 | /* Get a new uninitialized context. Create a new one if we cannot |
919 | re-use an old one. */ | |
f9b5f742 | 920 | static cpp_context * |
f7fdd7a1 | 921 | next_context (cpp_reader *pfile) |
f9b5f742 | 922 | { |
923 | cpp_context *result = pfile->context->next; | |
924 | ||
925 | if (result == 0) | |
69461e0d | 926 | { |
3b298764 | 927 | result = XNEW (cpp_context); |
f9b5f742 | 928 | result->prev = pfile->context; |
929 | result->next = 0; | |
930 | pfile->context->next = result; | |
79bd622b | 931 | } |
f9b5f742 | 932 | |
933 | pfile->context = result; | |
934 | return result; | |
79bd622b | 935 | } |
936 | ||
f9b5f742 | 937 | /* Push a list of pointers to tokens. */ |
938 | static void | |
f7fdd7a1 | 939 | push_ptoken_context (cpp_reader *pfile, cpp_hashnode *macro, _cpp_buff *buff, |
940 | const cpp_token **first, unsigned int count) | |
79bd622b | 941 | { |
942 | cpp_context *context = next_context (pfile); | |
79bd622b | 943 | |
f9b5f742 | 944 | context->direct_p = false; |
945 | context->macro = macro; | |
084163dc | 946 | context->buff = buff; |
a854276a | 947 | FIRST (context).ptoken = first; |
948 | LAST (context).ptoken = first + count; | |
f9b5f742 | 949 | } |
950 | ||
951 | /* Push a list of tokens. */ | |
952 | static void | |
f7fdd7a1 | 953 | push_token_context (cpp_reader *pfile, cpp_hashnode *macro, |
954 | const cpp_token *first, unsigned int count) | |
f9b5f742 | 955 | { |
956 | cpp_context *context = next_context (pfile); | |
957 | ||
958 | context->direct_p = true; | |
959 | context->macro = macro; | |
084163dc | 960 | context->buff = NULL; |
a854276a | 961 | FIRST (context).token = first; |
962 | LAST (context).token = first + count; | |
79bd622b | 963 | } |
964 | ||
f15f6c8d | 965 | /* Push a traditional macro's replacement text. */ |
966 | void | |
f7fdd7a1 | 967 | _cpp_push_text_context (cpp_reader *pfile, cpp_hashnode *macro, |
968 | const uchar *start, size_t len) | |
f15f6c8d | 969 | { |
970 | cpp_context *context = next_context (pfile); | |
971 | ||
972 | context->direct_p = true; | |
973 | context->macro = macro; | |
974 | context->buff = NULL; | |
975 | CUR (context) = start; | |
06025647 | 976 | RLIMIT (context) = start + len; |
01628c3c | 977 | macro->flags |= NODE_DISABLED; |
f15f6c8d | 978 | } |
979 | ||
88cf66fa | 980 | /* Expand an argument ARG before replacing parameters in a |
981 | function-like macro. This works by pushing a context with the | |
982 | argument's tokens, and then expanding that into a temporary buffer | |
983 | as if it were a normal part of the token stream. collect_args() | |
984 | has terminated the argument's tokens with a CPP_EOF so that we know | |
985 | when we have fully expanded the argument. */ | |
79bd622b | 986 | static void |
f7fdd7a1 | 987 | expand_arg (cpp_reader *pfile, macro_arg *arg) |
79bd622b | 988 | { |
f9b5f742 | 989 | unsigned int capacity; |
dbb7d6f7 | 990 | bool saved_warn_trad; |
f9b5f742 | 991 | |
f9b5f742 | 992 | if (arg->count == 0) |
993 | return; | |
79bd622b | 994 | |
dbb7d6f7 | 995 | /* Don't warn about funlike macros when pre-expanding. */ |
996 | saved_warn_trad = CPP_WTRADITIONAL (pfile); | |
997 | CPP_WTRADITIONAL (pfile) = 0; | |
998 | ||
79bd622b | 999 | /* Loop, reading in the arguments. */ |
f9b5f742 | 1000 | capacity = 256; |
f0af5a88 | 1001 | arg->expanded = xmalloc (capacity * sizeof (cpp_token *)); |
79bd622b | 1002 | |
084163dc | 1003 | push_ptoken_context (pfile, NULL, NULL, arg->first, arg->count + 1); |
f9b5f742 | 1004 | for (;;) |
79bd622b | 1005 | { |
f9b5f742 | 1006 | const cpp_token *token; |
1007 | ||
1008 | if (arg->expanded_count + 1 >= capacity) | |
69461e0d | 1009 | { |
79bd622b | 1010 | capacity *= 2; |
f0af5a88 | 1011 | arg->expanded = xrealloc (arg->expanded, |
1012 | capacity * sizeof (cpp_token *)); | |
79bd622b | 1013 | } |
79bd622b | 1014 | |
f9b5f742 | 1015 | token = cpp_get_token (pfile); |
79bd622b | 1016 | |
f9b5f742 | 1017 | if (token->type == CPP_EOF) |
1018 | break; | |
1019 | ||
1020 | arg->expanded[arg->expanded_count++] = token; | |
1021 | } | |
1022 | ||
084163dc | 1023 | _cpp_pop_context (pfile); |
dbb7d6f7 | 1024 | |
1025 | CPP_WTRADITIONAL (pfile) = saved_warn_trad; | |
79bd622b | 1026 | } |
1027 | ||
88cf66fa | 1028 | /* Pop the current context off the stack, re-enabling the macro if the |
1029 | context represented a macro's replacement list. The context | |
1030 | structure is not freed so that we can re-use it later. */ | |
79bd622b | 1031 | void |
f7fdd7a1 | 1032 | _cpp_pop_context (cpp_reader *pfile) |
79bd622b | 1033 | { |
084163dc | 1034 | cpp_context *context = pfile->context; |
1035 | ||
084163dc | 1036 | if (context->macro) |
c7e5d924 | 1037 | context->macro->flags &= ~NODE_DISABLED; |
084163dc | 1038 | |
1039 | if (context->buff) | |
1040 | _cpp_release_buff (pfile, context->buff); | |
79bd622b | 1041 | |
084163dc | 1042 | pfile->context = context->prev; |
79bd622b | 1043 | } |
1044 | ||
5c120a72 | 1045 | /* External routine to get a token. Also used nearly everywhere |
343fd982 | 1046 | internally, except for places where we know we can safely call |
5c120a72 | 1047 | _cpp_lex_token directly, such as lexing a directive name. |
343fd982 | 1048 | |
1049 | Macro expansions and directives are transparently handled, | |
1050 | including entering included files. Thus tokens are post-macro | |
1051 | expansion, and after any intervening directives. External callers | |
1052 | see CPP_EOF only at EOF. Internal callers also see it when meeting | |
1053 | a directive inside a macro call, when at the end of a directive and | |
1054 | state.in_directive is still 1, and at the end of argument | |
1055 | pre-expansion. */ | |
f9b5f742 | 1056 | const cpp_token * |
f7fdd7a1 | 1057 | cpp_get_token (cpp_reader *pfile) |
79bd622b | 1058 | { |
f9b5f742 | 1059 | const cpp_token *result; |
1060 | ||
def71b06 | 1061 | for (;;) |
79bd622b | 1062 | { |
f9b5f742 | 1063 | cpp_hashnode *node; |
79bd622b | 1064 | cpp_context *context = pfile->context; |
1065 | ||
79bd622b | 1066 | /* Context->prev == 0 <=> base context. */ |
fb5ab82c | 1067 | if (!context->prev) |
f9b5f742 | 1068 | result = _cpp_lex_token (pfile); |
a854276a | 1069 | else if (FIRST (context).token != LAST (context).token) |
def71b06 | 1070 | { |
f9b5f742 | 1071 | if (context->direct_p) |
a854276a | 1072 | result = FIRST (context).token++; |
f9b5f742 | 1073 | else |
a854276a | 1074 | result = *FIRST (context).ptoken++; |
f9b5f742 | 1075 | |
1076 | if (result->flags & PASTE_LEFT) | |
e55de93e | 1077 | { |
f9b5f742 | 1078 | paste_all_tokens (pfile, result); |
1079 | if (pfile->state.in_directive) | |
1080 | continue; | |
1081 | return padding_token (pfile, result); | |
e55de93e | 1082 | } |
def71b06 | 1083 | } |
79bd622b | 1084 | else |
1085 | { | |
fb5ab82c | 1086 | _cpp_pop_context (pfile); |
f9b5f742 | 1087 | if (pfile->state.in_directive) |
1088 | continue; | |
1089 | return &pfile->avoid_paste; | |
79bd622b | 1090 | } |
79bd622b | 1091 | |
d3f7919d | 1092 | if (pfile->state.in_directive && result->type == CPP_COMMENT) |
1093 | continue; | |
1094 | ||
f9b5f742 | 1095 | if (result->type != CPP_NAME) |
79bd622b | 1096 | break; |
1097 | ||
f9b5f742 | 1098 | node = result->val.node; |
1099 | ||
c7e5d924 | 1100 | if (node->type != NT_MACRO || (result->flags & NO_EXPAND)) |
1101 | break; | |
b1a9ff83 | 1102 | |
c7e5d924 | 1103 | if (!(node->flags & NODE_DISABLED)) |
79bd622b | 1104 | { |
c7e5d924 | 1105 | if (!pfile->state.prevent_expansion |
1106 | && enter_macro_context (pfile, node)) | |
8c2e2fc5 | 1107 | { |
f9b5f742 | 1108 | if (pfile->state.in_directive) |
1109 | continue; | |
1110 | return padding_token (pfile, result); | |
8c2e2fc5 | 1111 | } |
79bd622b | 1112 | } |
c7e5d924 | 1113 | else |
1114 | { | |
88cf66fa | 1115 | /* Flag this token as always unexpandable. FIXME: move this |
1116 | to collect_args()?. */ | |
c7e5d924 | 1117 | cpp_token *t = _cpp_temp_token (pfile); |
1118 | t->type = result->type; | |
1119 | t->flags = result->flags | NO_EXPAND; | |
1120 | t->val.str = result->val.str; | |
1121 | result = t; | |
1122 | } | |
396ffa86 | 1123 | |
c7e5d924 | 1124 | break; |
79bd622b | 1125 | } |
f9b5f742 | 1126 | |
1127 | return result; | |
79bd622b | 1128 | } |
1129 | ||
ae2348f6 | 1130 | /* Returns true if we're expanding an object-like macro that was |
1131 | defined in a system header. Just checks the macro at the top of | |
1132 | the stack. Used for diagnostic suppression. */ | |
1133 | int | |
f7fdd7a1 | 1134 | cpp_sys_macro_p (cpp_reader *pfile) |
ae2348f6 | 1135 | { |
c7e5d924 | 1136 | cpp_hashnode *node = pfile->context->macro; |
ae2348f6 | 1137 | |
c7e5d924 | 1138 | return node && node->value.macro && node->value.macro->syshdr; |
ae2348f6 | 1139 | } |
1140 | ||
02516fb9 | 1141 | /* Read each token in, until end of the current file. Directives are |
1142 | transparently processed. */ | |
79bd622b | 1143 | void |
f7fdd7a1 | 1144 | cpp_scan_nooutput (cpp_reader *pfile) |
79bd622b | 1145 | { |
6e04daf1 | 1146 | /* Request a CPP_EOF token at the end of this file, rather than |
1147 | transparently continuing with the including file. */ | |
1148 | pfile->buffer->return_at_eof = true; | |
1149 | ||
3eb3f293 | 1150 | pfile->state.discarding_output++; |
1151 | pfile->state.prevent_expansion++; | |
1152 | ||
7951771a | 1153 | if (CPP_OPTION (pfile, traditional)) |
1154 | while (_cpp_read_logical_line_trad (pfile)) | |
1155 | ; | |
1156 | else | |
1157 | while (cpp_get_token (pfile)->type != CPP_EOF) | |
1158 | ; | |
3eb3f293 | 1159 | |
1160 | pfile->state.discarding_output--; | |
1161 | pfile->state.prevent_expansion--; | |
79bd622b | 1162 | } |
1163 | ||
fb5ab82c | 1164 | /* Step back one (or more) tokens. Can only step mack more than 1 if |
1165 | they are from the lexer, and not from macro expansion. */ | |
920b5d41 | 1166 | void |
f7fdd7a1 | 1167 | _cpp_backup_tokens (cpp_reader *pfile, unsigned int count) |
79bd622b | 1168 | { |
fb5ab82c | 1169 | if (pfile->context->prev == NULL) |
79bd622b | 1170 | { |
fb5ab82c | 1171 | pfile->lookaheads += count; |
1172 | while (count--) | |
1173 | { | |
61a655af | 1174 | pfile->cur_token--; |
1175 | if (pfile->cur_token == pfile->cur_run->base | |
1176 | /* Possible with -fpreprocessed and no leading #line. */ | |
1177 | && pfile->cur_run->prev != NULL) | |
fb5ab82c | 1178 | { |
fb5ab82c | 1179 | pfile->cur_run = pfile->cur_run->prev; |
1180 | pfile->cur_token = pfile->cur_run->limit; | |
1181 | } | |
1182 | } | |
79bd622b | 1183 | } |
fb5ab82c | 1184 | else |
79bd622b | 1185 | { |
fb5ab82c | 1186 | if (count != 1) |
1187 | abort (); | |
f9b5f742 | 1188 | if (pfile->context->direct_p) |
a854276a | 1189 | FIRST (pfile->context).token--; |
f9b5f742 | 1190 | else |
a854276a | 1191 | FIRST (pfile->context).ptoken--; |
79bd622b | 1192 | } |
1193 | } | |
69461e0d | 1194 | |
79bd622b | 1195 | /* #define directive parsing and handling. */ |
1196 | ||
d10cfa8d | 1197 | /* Returns nonzero if a macro redefinition warning is required. */ |
f15f6c8d | 1198 | static bool |
f7fdd7a1 | 1199 | warn_of_redefinition (cpp_reader *pfile, const cpp_hashnode *node, |
1200 | const cpp_macro *macro2) | |
79bd622b | 1201 | { |
1202 | const cpp_macro *macro1; | |
1203 | unsigned int i; | |
1204 | ||
31ca26b1 | 1205 | /* Some redefinitions need to be warned about regardless. */ |
1206 | if (node->flags & NODE_WARN) | |
f15f6c8d | 1207 | return true; |
79bd622b | 1208 | |
31ca26b1 | 1209 | /* Redefinition of a macro is allowed if and only if the old and new |
2c0e001b | 1210 | definitions are the same. (6.10.3 paragraph 2). */ |
79bd622b | 1211 | macro1 = node->value.macro; |
1212 | ||
3396dc80 | 1213 | /* Don't check count here as it can be different in valid |
1214 | traditional redefinitions with just whitespace differences. */ | |
1215 | if (macro1->paramc != macro2->paramc | |
79bd622b | 1216 | || macro1->fun_like != macro2->fun_like |
53c052ca | 1217 | || macro1->variadic != macro2->variadic) |
f15f6c8d | 1218 | return true; |
79bd622b | 1219 | |
1220 | /* Check parameter spellings. */ | |
1221 | for (i = 0; i < macro1->paramc; i++) | |
1222 | if (macro1->params[i] != macro2->params[i]) | |
f15f6c8d | 1223 | return true; |
79bd622b | 1224 | |
f15f6c8d | 1225 | /* Check the replacement text or tokens. */ |
1226 | if (CPP_OPTION (pfile, traditional)) | |
3396dc80 | 1227 | return _cpp_expansions_different_trad (macro1, macro2); |
f15f6c8d | 1228 | |
9c7ff5cc | 1229 | if (macro1->count != macro2->count) |
1230 | return true; | |
1231 | ||
1232 | for (i = 0; i < macro1->count; i++) | |
1233 | if (!_cpp_equiv_tokens (¯o1->exp.tokens[i], ¯o2->exp.tokens[i])) | |
1234 | return true; | |
f15f6c8d | 1235 | |
1236 | return false; | |
79bd622b | 1237 | } |
1238 | ||
1239 | /* Free the definition of hashnode H. */ | |
69461e0d | 1240 | void |
f7fdd7a1 | 1241 | _cpp_free_definition (cpp_hashnode *h) |
69461e0d | 1242 | { |
79bd622b | 1243 | /* Macros and assertions no longer have anything to free. */ |
1244 | h->type = NT_VOID; | |
1245 | /* Clear builtin flag in case of redefinition. */ | |
c7e5d924 | 1246 | h->flags &= ~(NODE_BUILTIN | NODE_DISABLED); |
79bd622b | 1247 | } |
1248 | ||
10b4496a | 1249 | /* Save parameter NODE to the parameter list of macro MACRO. Returns |
d10cfa8d | 1250 | zero on success, nonzero if the parameter is a duplicate. */ |
198b48a0 | 1251 | bool |
f7fdd7a1 | 1252 | _cpp_save_parameter (cpp_reader *pfile, cpp_macro *macro, cpp_hashnode *node) |
79bd622b | 1253 | { |
805e22b2 | 1254 | unsigned int len; |
79bd622b | 1255 | /* Constraint 6.10.3.6 - duplicate parameter names. */ |
805e22b2 | 1256 | if (node->flags & NODE_MACRO_ARG) |
11d10d3f | 1257 | { |
d80d2074 | 1258 | cpp_error (pfile, CPP_DL_ERROR, "duplicate macro parameter \"%s\"", |
73328dce | 1259 | NODE_NAME (node)); |
1ae6ed16 | 1260 | return true; |
79bd622b | 1261 | } |
11d10d3f | 1262 | |
e6a5f963 | 1263 | if (BUFF_ROOM (pfile->a_buff) |
1264 | < (macro->paramc + 1) * sizeof (cpp_hashnode *)) | |
1265 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_hashnode *)); | |
11d10d3f | 1266 | |
e6a5f963 | 1267 | ((cpp_hashnode **) BUFF_FRONT (pfile->a_buff))[macro->paramc++] = node; |
805e22b2 | 1268 | node->flags |= NODE_MACRO_ARG; |
1269 | len = macro->paramc * sizeof (union _cpp_hashnode_value); | |
1270 | if (len > pfile->macro_buffer_len) | |
1271 | { | |
f0af5a88 | 1272 | pfile->macro_buffer = xrealloc (pfile->macro_buffer, len); |
805e22b2 | 1273 | pfile->macro_buffer_len = len; |
1274 | } | |
1275 | ((union _cpp_hashnode_value *) pfile->macro_buffer)[macro->paramc - 1] | |
1276 | = node->value; | |
1277 | ||
1278 | node->value.arg_index = macro->paramc; | |
1ae6ed16 | 1279 | return false; |
69461e0d | 1280 | } |
1281 | ||
1ae6ed16 | 1282 | /* Check the syntax of the parameters in a MACRO definition. Returns |
1283 | false if an error occurs. */ | |
1284 | static bool | |
f7fdd7a1 | 1285 | parse_params (cpp_reader *pfile, cpp_macro *macro) |
69461e0d | 1286 | { |
79bd622b | 1287 | unsigned int prev_ident = 0; |
69461e0d | 1288 | |
79bd622b | 1289 | for (;;) |
69461e0d | 1290 | { |
c00e481c | 1291 | const cpp_token *token = _cpp_lex_token (pfile); |
69461e0d | 1292 | |
c00e481c | 1293 | switch (token->type) |
69461e0d | 1294 | { |
79bd622b | 1295 | default: |
d3f7919d | 1296 | /* Allow/ignore comments in parameter lists if we are |
1297 | preserving comments in macro expansions. */ | |
1298 | if (token->type == CPP_COMMENT | |
1299 | && ! CPP_OPTION (pfile, discard_comments_in_macro_exp)) | |
1300 | continue; | |
1301 | ||
d80d2074 | 1302 | cpp_error (pfile, CPP_DL_ERROR, |
73328dce | 1303 | "\"%s\" may not appear in macro parameter list", |
c00e481c | 1304 | cpp_token_as_text (pfile, token)); |
1ae6ed16 | 1305 | return false; |
79bd622b | 1306 | |
69461e0d | 1307 | case CPP_NAME: |
79bd622b | 1308 | if (prev_ident) |
1309 | { | |
d80d2074 | 1310 | cpp_error (pfile, CPP_DL_ERROR, |
73328dce | 1311 | "macro parameters must be comma-separated"); |
1ae6ed16 | 1312 | return false; |
79bd622b | 1313 | } |
1314 | prev_ident = 1; | |
1315 | ||
198b48a0 | 1316 | if (_cpp_save_parameter (pfile, macro, token->val.node)) |
1ae6ed16 | 1317 | return false; |
79bd622b | 1318 | continue; |
69461e0d | 1319 | |
79bd622b | 1320 | case CPP_CLOSE_PAREN: |
1321 | if (prev_ident || macro->paramc == 0) | |
1ae6ed16 | 1322 | return true; |
69461e0d | 1323 | |
79bd622b | 1324 | /* Fall through to pick up the error. */ |
1325 | case CPP_COMMA: | |
1326 | if (!prev_ident) | |
1327 | { | |
d80d2074 | 1328 | cpp_error (pfile, CPP_DL_ERROR, "parameter name missing"); |
1ae6ed16 | 1329 | return false; |
79bd622b | 1330 | } |
1331 | prev_ident = 0; | |
69461e0d | 1332 | continue; |
1333 | ||
79bd622b | 1334 | case CPP_ELLIPSIS: |
53c052ca | 1335 | macro->variadic = 1; |
79bd622b | 1336 | if (!prev_ident) |
1337 | { | |
198b48a0 | 1338 | _cpp_save_parameter (pfile, macro, |
1339 | pfile->spec_nodes.n__VA_ARGS__); | |
79bd622b | 1340 | pfile->state.va_args_ok = 1; |
05d51900 | 1341 | if (! CPP_OPTION (pfile, c99) |
1342 | && CPP_OPTION (pfile, pedantic) | |
1343 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
d80d2074 | 1344 | cpp_error (pfile, CPP_DL_PEDWARN, |
73328dce | 1345 | "anonymous variadic macros were introduced in C99"); |
79bd622b | 1346 | } |
05d51900 | 1347 | else if (CPP_OPTION (pfile, pedantic) |
1348 | && CPP_OPTION (pfile, warn_variadic_macros)) | |
d80d2074 | 1349 | cpp_error (pfile, CPP_DL_PEDWARN, |
73328dce | 1350 | "ISO C does not permit named variadic macros"); |
69461e0d | 1351 | |
79bd622b | 1352 | /* We're at the end, and just expect a closing parenthesis. */ |
c00e481c | 1353 | token = _cpp_lex_token (pfile); |
1354 | if (token->type == CPP_CLOSE_PAREN) | |
1ae6ed16 | 1355 | return true; |
79bd622b | 1356 | /* Fall through. */ |
69461e0d | 1357 | |
79bd622b | 1358 | case CPP_EOF: |
d80d2074 | 1359 | cpp_error (pfile, CPP_DL_ERROR, "missing ')' in macro parameter list"); |
1ae6ed16 | 1360 | return false; |
69461e0d | 1361 | } |
69461e0d | 1362 | } |
79bd622b | 1363 | } |
1364 | ||
10b4496a | 1365 | /* Allocate room for a token from a macro's replacement list. */ |
79bd622b | 1366 | static cpp_token * |
f7fdd7a1 | 1367 | alloc_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
79bd622b | 1368 | { |
e6a5f963 | 1369 | if (BUFF_ROOM (pfile->a_buff) < (macro->count + 1) * sizeof (cpp_token)) |
1370 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (cpp_token)); | |
69461e0d | 1371 | |
e6a5f963 | 1372 | return &((cpp_token *) BUFF_FRONT (pfile->a_buff))[macro->count++]; |
10b4496a | 1373 | } |
1374 | ||
88cf66fa | 1375 | /* Lex a token from the expansion of MACRO, but mark parameters as we |
1376 | find them and warn of traditional stringification. */ | |
10b4496a | 1377 | static cpp_token * |
f7fdd7a1 | 1378 | lex_expansion_token (cpp_reader *pfile, cpp_macro *macro) |
10b4496a | 1379 | { |
1380 | cpp_token *token; | |
1381 | ||
1382 | pfile->cur_token = alloc_expansion_token (pfile, macro); | |
1383 | token = _cpp_lex_direct (pfile); | |
79bd622b | 1384 | |
88cf66fa | 1385 | /* Is this a parameter? */ |
805e22b2 | 1386 | if (token->type == CPP_NAME |
1387 | && (token->val.node->flags & NODE_MACRO_ARG) != 0) | |
79bd622b | 1388 | { |
1389 | token->type = CPP_MACRO_ARG; | |
805e22b2 | 1390 | token->val.arg_no = token->val.node->value.arg_index; |
79bd622b | 1391 | } |
1392 | else if (CPP_WTRADITIONAL (pfile) && macro->paramc > 0 | |
1393 | && (token->type == CPP_STRING || token->type == CPP_CHAR)) | |
1394 | check_trad_stringification (pfile, macro, &token->val.str); | |
1395 | ||
1396 | return token; | |
69461e0d | 1397 | } |
1398 | ||
f15f6c8d | 1399 | static bool |
f7fdd7a1 | 1400 | create_iso_definition (cpp_reader *pfile, cpp_macro *macro) |
69461e0d | 1401 | { |
f15f6c8d | 1402 | cpp_token *token; |
10b4496a | 1403 | const cpp_token *ctoken; |
79bd622b | 1404 | |
1405 | /* Get the first token of the expansion (or the '(' of a | |
1406 | function-like macro). */ | |
10b4496a | 1407 | ctoken = _cpp_lex_token (pfile); |
1408 | ||
1409 | if (ctoken->type == CPP_OPEN_PAREN && !(ctoken->flags & PREV_WHITE)) | |
79bd622b | 1410 | { |
f15f6c8d | 1411 | bool ok = parse_params (pfile, macro); |
e6a5f963 | 1412 | macro->params = (cpp_hashnode **) BUFF_FRONT (pfile->a_buff); |
1413 | if (!ok) | |
f15f6c8d | 1414 | return false; |
e6a5f963 | 1415 | |
c39ed964 | 1416 | /* Success. Commit or allocate the parameter array. */ |
1417 | if (pfile->hash_table->alloc_subobject) | |
1418 | { | |
1419 | cpp_token *tokns = pfile->hash_table->alloc_subobject | |
1420 | (sizeof (cpp_token) * macro->paramc); | |
1421 | memcpy (tokns, macro->params, sizeof (cpp_token) * macro->paramc); | |
1422 | macro->params = tokns; | |
1423 | } | |
1424 | else | |
1425 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->params[macro->paramc]; | |
79bd622b | 1426 | macro->fun_like = 1; |
79bd622b | 1427 | } |
10b4496a | 1428 | else if (ctoken->type != CPP_EOF && !(ctoken->flags & PREV_WHITE)) |
d80d2074 | 1429 | cpp_error (pfile, CPP_DL_PEDWARN, |
73328dce | 1430 | "ISO C requires whitespace after the macro name"); |
69461e0d | 1431 | |
10b4496a | 1432 | if (macro->fun_like) |
1433 | token = lex_expansion_token (pfile, macro); | |
1434 | else | |
1435 | { | |
1436 | token = alloc_expansion_token (pfile, macro); | |
1437 | *token = *ctoken; | |
1438 | } | |
69461e0d | 1439 | |
79bd622b | 1440 | for (;;) |
1441 | { | |
1442 | /* Check the stringifying # constraint 6.10.3.2.1 of | |
1443 | function-like macros when lexing the subsequent token. */ | |
1444 | if (macro->count > 1 && token[-1].type == CPP_HASH && macro->fun_like) | |
1445 | { | |
1446 | if (token->type == CPP_MACRO_ARG) | |
1447 | { | |
1448 | token->flags &= ~PREV_WHITE; | |
1449 | token->flags |= STRINGIFY_ARG; | |
1450 | token->flags |= token[-1].flags & PREV_WHITE; | |
1451 | token[-1] = token[0]; | |
1452 | macro->count--; | |
1453 | } | |
1454 | /* Let assembler get away with murder. */ | |
5db5d057 | 1455 | else if (CPP_OPTION (pfile, lang) != CLK_ASM) |
79bd622b | 1456 | { |
d80d2074 | 1457 | cpp_error (pfile, CPP_DL_ERROR, |
73328dce | 1458 | "'#' is not followed by a macro parameter"); |
f15f6c8d | 1459 | return false; |
79bd622b | 1460 | } |
1461 | } | |
1462 | ||
1463 | if (token->type == CPP_EOF) | |
1464 | break; | |
1465 | ||
1466 | /* Paste operator constraint 6.10.3.3.1. */ | |
1467 | if (token->type == CPP_PASTE) | |
1468 | { | |
1469 | /* Token-paste ##, can appear in both object-like and | |
1470 | function-like macros, but not at the ends. */ | |
1471 | if (--macro->count > 0) | |
1472 | token = lex_expansion_token (pfile, macro); | |
1473 | ||
1474 | if (macro->count == 0 || token->type == CPP_EOF) | |
1475 | { | |
d80d2074 | 1476 | cpp_error (pfile, CPP_DL_ERROR, |
f7fdd7a1 | 1477 | "'##' cannot appear at either end of a macro expansion"); |
f15f6c8d | 1478 | return false; |
79bd622b | 1479 | } |
69461e0d | 1480 | |
79bd622b | 1481 | token[-1].flags |= PASTE_LEFT; |
79bd622b | 1482 | } |
1483 | ||
1484 | token = lex_expansion_token (pfile, macro); | |
1485 | } | |
1486 | ||
672f38da | 1487 | macro->exp.tokens = (cpp_token *) BUFF_FRONT (pfile->a_buff); |
c39ed964 | 1488 | macro->traditional = 0; |
e6a5f963 | 1489 | |
3c7df4d3 | 1490 | /* Don't count the CPP_EOF. */ |
1491 | macro->count--; | |
79bd622b | 1492 | |
88cf66fa | 1493 | /* Clear whitespace on first token for warn_of_redefinition(). */ |
e6a5f963 | 1494 | if (macro->count) |
672f38da | 1495 | macro->exp.tokens[0].flags &= ~PREV_WHITE; |
e6a5f963 | 1496 | |
c39ed964 | 1497 | /* Commit or allocate the memory. */ |
1498 | if (pfile->hash_table->alloc_subobject) | |
1499 | { | |
1500 | cpp_token *tokns = pfile->hash_table->alloc_subobject (sizeof (cpp_token) | |
1501 | * macro->count); | |
1502 | memcpy (tokns, macro->exp.tokens, sizeof (cpp_token) * macro->count); | |
1503 | macro->exp.tokens = tokns; | |
1504 | } | |
1505 | else | |
1506 | BUFF_FRONT (pfile->a_buff) = (uchar *) ¯o->exp.tokens[macro->count]; | |
e6a5f963 | 1507 | |
f15f6c8d | 1508 | return true; |
1509 | } | |
1510 | ||
d10cfa8d | 1511 | /* Parse a macro and save its expansion. Returns nonzero on success. */ |
f15f6c8d | 1512 | bool |
f7fdd7a1 | 1513 | _cpp_create_definition (cpp_reader *pfile, cpp_hashnode *node) |
f15f6c8d | 1514 | { |
1515 | cpp_macro *macro; | |
1516 | unsigned int i; | |
1517 | bool ok; | |
4dab9f9f | 1518 | |
c39ed964 | 1519 | if (pfile->hash_table->alloc_subobject) |
1520 | macro = pfile->hash_table->alloc_subobject (sizeof (cpp_macro)); | |
1521 | else | |
1522 | macro = (cpp_macro *) _cpp_aligned_alloc (pfile, sizeof (cpp_macro)); | |
f15f6c8d | 1523 | macro->line = pfile->directive_line; |
1524 | macro->params = 0; | |
1525 | macro->paramc = 0; | |
1526 | macro->variadic = 0; | |
b717e161 | 1527 | macro->used = !CPP_OPTION (pfile, warn_unused_macros); |
f15f6c8d | 1528 | macro->count = 0; |
1529 | macro->fun_like = 0; | |
ae2348f6 | 1530 | /* To suppress some diagnostics. */ |
610625e3 | 1531 | macro->syshdr = pfile->buffer && pfile->buffer->sysp != 0; |
ae2348f6 | 1532 | |
f15f6c8d | 1533 | if (CPP_OPTION (pfile, traditional)) |
1534 | ok = _cpp_create_trad_definition (pfile, macro); | |
1535 | else | |
1536 | { | |
1537 | cpp_token *saved_cur_token = pfile->cur_token; | |
1538 | ||
1539 | ok = create_iso_definition (pfile, macro); | |
1540 | ||
1541 | /* Restore lexer position because of games lex_expansion_token() | |
1542 | plays lexing the macro. We set the type for SEEN_EOL() in | |
f03668bd | 1543 | directives.c. |
f15f6c8d | 1544 | |
1545 | Longer term we should lex the whole line before coming here, | |
1546 | and just copy the expansion. */ | |
1547 | saved_cur_token[-1].type = pfile->cur_token[-1].type; | |
1548 | pfile->cur_token = saved_cur_token; | |
1549 | ||
1550 | /* Stop the lexer accepting __VA_ARGS__. */ | |
1551 | pfile->state.va_args_ok = 0; | |
1552 | } | |
1553 | ||
1554 | /* Clear the fast argument lookup indices. */ | |
1555 | for (i = macro->paramc; i-- > 0; ) | |
805e22b2 | 1556 | { |
1557 | struct cpp_hashnode *node = macro->params[i]; | |
1558 | node->flags &= ~ NODE_MACRO_ARG; | |
1559 | node->value = ((union _cpp_hashnode_value *) pfile->macro_buffer)[i]; | |
1560 | } | |
f15f6c8d | 1561 | |
1562 | if (!ok) | |
1563 | return ok; | |
1564 | ||
70145d81 | 1565 | if (node->type == NT_MACRO) |
69461e0d | 1566 | { |
71a7c282 | 1567 | if (CPP_OPTION (pfile, warn_unused_macros)) |
1568 | _cpp_warn_if_unused_macro (pfile, node, NULL); | |
1569 | ||
f15f6c8d | 1570 | if (warn_of_redefinition (pfile, node, macro)) |
69461e0d | 1571 | { |
d80d2074 | 1572 | cpp_error_with_line (pfile, CPP_DL_PEDWARN, pfile->directive_line, 0, |
73328dce | 1573 | "\"%s\" redefined", NODE_NAME (node)); |
79bd622b | 1574 | |
31ca26b1 | 1575 | if (node->type == NT_MACRO && !(node->flags & NODE_BUILTIN)) |
d80d2074 | 1576 | cpp_error_with_line (pfile, CPP_DL_PEDWARN, |
f15f6c8d | 1577 | node->value.macro->line, 0, |
1578 | "this is the location of the previous definition"); | |
69461e0d | 1579 | } |
69461e0d | 1580 | } |
1581 | ||
70145d81 | 1582 | if (node->type != NT_VOID) |
1583 | _cpp_free_definition (node); | |
1584 | ||
69461e0d | 1585 | /* Enter definition in hash table. */ |
79bd622b | 1586 | node->type = NT_MACRO; |
1587 | node->value.macro = macro; | |
c86dbc5b | 1588 | if (! ustrncmp (NODE_NAME (node), DSC ("__STDC_"))) |
31ca26b1 | 1589 | node->flags |= NODE_WARN; |
69461e0d | 1590 | |
79bd622b | 1591 | return ok; |
69461e0d | 1592 | } |
1593 | ||
88cf66fa | 1594 | /* Warn if a token in STRING matches one of a function-like MACRO's |
1595 | parameters. */ | |
bceb9193 | 1596 | static void |
f7fdd7a1 | 1597 | check_trad_stringification (cpp_reader *pfile, const cpp_macro *macro, |
1598 | const cpp_string *string) | |
bceb9193 | 1599 | { |
79bd622b | 1600 | unsigned int i, len; |
4970d4c2 | 1601 | const uchar *p, *q, *limit; |
b1a9ff83 | 1602 | |
bceb9193 | 1603 | /* Loop over the string. */ |
4970d4c2 | 1604 | limit = string->text + string->len - 1; |
1605 | for (p = string->text + 1; p < limit; p = q) | |
bceb9193 | 1606 | { |
bceb9193 | 1607 | /* Find the start of an identifier. */ |
7e118154 | 1608 | while (p < limit && !is_idstart (*p)) |
1609 | p++; | |
bceb9193 | 1610 | |
1611 | /* Find the end of the identifier. */ | |
1612 | q = p; | |
7e118154 | 1613 | while (q < limit && is_idchar (*q)) |
1614 | q++; | |
79bd622b | 1615 | |
1616 | len = q - p; | |
1617 | ||
bceb9193 | 1618 | /* Loop over the function macro arguments to see if the |
1619 | identifier inside the string matches one of them. */ | |
79bd622b | 1620 | for (i = 0; i < macro->paramc; i++) |
1621 | { | |
1622 | const cpp_hashnode *node = macro->params[i]; | |
bceb9193 | 1623 | |
0d086e18 | 1624 | if (NODE_LEN (node) == len |
1625 | && !memcmp (p, NODE_NAME (node), len)) | |
bceb9193 | 1626 | { |
d80d2074 | 1627 | cpp_error (pfile, CPP_DL_WARNING, |
455730ef | 1628 | "macro argument \"%s\" would be stringified in traditional C", |
73328dce | 1629 | NODE_NAME (node)); |
bceb9193 | 1630 | break; |
1631 | } | |
1632 | } | |
1633 | } | |
1634 | } | |
79bd622b | 1635 | |
4d9e9a28 | 1636 | /* Returns the name, arguments and expansion of a macro, in a format |
1637 | suitable to be read back in again, and therefore also for DWARF 2 | |
1638 | debugging info. e.g. "PASTE(X, Y) X ## Y", or "MACNAME EXPANSION". | |
1639 | Caller is expected to generate the "#define" bit if needed. The | |
79bd622b | 1640 | returned text is temporary, and automatically freed later. */ |
79bd622b | 1641 | const unsigned char * |
f7fdd7a1 | 1642 | cpp_macro_definition (cpp_reader *pfile, const cpp_hashnode *node) |
79bd622b | 1643 | { |
1644 | unsigned int i, len; | |
1645 | const cpp_macro *macro = node->value.macro; | |
1646 | unsigned char *buffer; | |
1647 | ||
1648 | if (node->type != NT_MACRO || (node->flags & NODE_BUILTIN)) | |
1649 | { | |
d80d2074 | 1650 | cpp_error (pfile, CPP_DL_ICE, |
73328dce | 1651 | "invalid hash type %d in cpp_macro_definition", node->type); |
79bd622b | 1652 | return 0; |
1653 | } | |
1654 | ||
1655 | /* Calculate length. */ | |
f6bf950b | 1656 | len = NODE_LEN (node) + 2; /* ' ' and NUL. */ |
79bd622b | 1657 | if (macro->fun_like) |
1658 | { | |
3a68fd94 | 1659 | len += 4; /* "()" plus possible final ".." of named |
1660 | varargs (we have + 1 below). */ | |
79bd622b | 1661 | for (i = 0; i < macro->paramc; i++) |
3a68fd94 | 1662 | len += NODE_LEN (macro->params[i]) + 1; /* "," */ |
79bd622b | 1663 | } |
1664 | ||
9c343313 | 1665 | if (CPP_OPTION (pfile, traditional)) |
1666 | len += _cpp_replacement_text_len (macro); | |
1667 | else | |
79bd622b | 1668 | { |
9c343313 | 1669 | for (i = 0; i < macro->count; i++) |
1670 | { | |
1671 | cpp_token *token = ¯o->exp.tokens[i]; | |
79bd622b | 1672 | |
9c343313 | 1673 | if (token->type == CPP_MACRO_ARG) |
1674 | len += NODE_LEN (macro->params[token->val.arg_no - 1]); | |
1675 | else | |
b1280514 | 1676 | len += cpp_token_len (token) + 1; /* Includes room for ' '. */ |
9c343313 | 1677 | if (token->flags & STRINGIFY_ARG) |
1678 | len++; /* "#" */ | |
1679 | if (token->flags & PASTE_LEFT) | |
1680 | len += 3; /* " ##" */ | |
1681 | } | |
79bd622b | 1682 | } |
1683 | ||
1684 | if (len > pfile->macro_buffer_len) | |
8744fb7e | 1685 | { |
f0af5a88 | 1686 | pfile->macro_buffer = xrealloc (pfile->macro_buffer, len); |
8744fb7e | 1687 | pfile->macro_buffer_len = len; |
1688 | } | |
4d9e9a28 | 1689 | |
1690 | /* Fill in the buffer. Start with the macro name. */ | |
79bd622b | 1691 | buffer = pfile->macro_buffer; |
4d9e9a28 | 1692 | memcpy (buffer, NODE_NAME (node), NODE_LEN (node)); |
1693 | buffer += NODE_LEN (node); | |
79bd622b | 1694 | |
1695 | /* Parameter names. */ | |
1696 | if (macro->fun_like) | |
1697 | { | |
1698 | *buffer++ = '('; | |
1699 | for (i = 0; i < macro->paramc; i++) | |
1700 | { | |
1701 | cpp_hashnode *param = macro->params[i]; | |
1702 | ||
1703 | if (param != pfile->spec_nodes.n__VA_ARGS__) | |
1704 | { | |
c86dbc5b | 1705 | memcpy (buffer, NODE_NAME (param), NODE_LEN (param)); |
1706 | buffer += NODE_LEN (param); | |
79bd622b | 1707 | } |
1708 | ||
1709 | if (i + 1 < macro->paramc) | |
b1a9ff83 | 1710 | /* Don't emit a space after the comma here; we're trying |
1711 | to emit a Dwarf-friendly definition, and the Dwarf spec | |
1712 | forbids spaces in the argument list. */ | |
3a68fd94 | 1713 | *buffer++ = ','; |
53c052ca | 1714 | else if (macro->variadic) |
79bd622b | 1715 | *buffer++ = '.', *buffer++ = '.', *buffer++ = '.'; |
1716 | } | |
1717 | *buffer++ = ')'; | |
1718 | } | |
1719 | ||
920e5093 | 1720 | /* The Dwarf spec requires a space after the macro name, even if the |
1721 | definition is the empty string. */ | |
1722 | *buffer++ = ' '; | |
1723 | ||
9c343313 | 1724 | if (CPP_OPTION (pfile, traditional)) |
1725 | buffer = _cpp_copy_replacement_text (macro, buffer); | |
1726 | else if (macro->count) | |
79bd622b | 1727 | /* Expansion tokens. */ |
79bd622b | 1728 | { |
79bd622b | 1729 | for (i = 0; i < macro->count; i++) |
1730 | { | |
672f38da | 1731 | cpp_token *token = ¯o->exp.tokens[i]; |
79bd622b | 1732 | |
1733 | if (token->flags & PREV_WHITE) | |
1734 | *buffer++ = ' '; | |
1735 | if (token->flags & STRINGIFY_ARG) | |
1736 | *buffer++ = '#'; | |
1737 | ||
1738 | if (token->type == CPP_MACRO_ARG) | |
1739 | { | |
c86dbc5b | 1740 | len = NODE_LEN (macro->params[token->val.arg_no - 1]); |
1741 | memcpy (buffer, | |
1742 | NODE_NAME (macro->params[token->val.arg_no - 1]), len); | |
79bd622b | 1743 | buffer += len; |
1744 | } | |
1745 | else | |
1746 | buffer = cpp_spell_token (pfile, token, buffer); | |
1747 | ||
1748 | if (token->flags & PASTE_LEFT) | |
1749 | { | |
1750 | *buffer++ = ' '; | |
1751 | *buffer++ = '#'; | |
1752 | *buffer++ = '#'; | |
1753 | /* Next has PREV_WHITE; see _cpp_create_definition. */ | |
1754 | } | |
1755 | } | |
1756 | } | |
1757 | ||
1758 | *buffer = '\0'; | |
1759 | return pfile->macro_buffer; | |
1760 | } |