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a949941c | 1 | /* CPP Library. (Directive handling.) |
5e7b4e25 JL |
2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
3 | 1999, 2000 Free Software Foundation, Inc. | |
4c8cc616 | 4 | Contributed by Per Bothner, 1994-95. |
d8bfa78c | 5 | Based on CCCP program by Paul Rubin, June 1986 |
7f2935c7 PB |
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 | |
956d6950 | 20 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
7f2935c7 | 21 | |
956d6950 | 22 | #include "config.h" |
b04cd507 | 23 | #include "system.h" |
7f2935c7 | 24 | |
956d6950 JL |
25 | #include "cpplib.h" |
26 | #include "cpphash.h" | |
ab87f8c8 | 27 | #include "intl.h" |
c71f835b | 28 | #include "obstack.h" |
07aa0b04 | 29 | #include "symcat.h" |
7f2935c7 | 30 | |
93c80368 NB |
31 | /* Chained list of answers to an assertion. */ |
32 | struct answer | |
33 | { | |
34 | struct answer *next; | |
35 | unsigned int count; | |
36 | cpp_token first[1]; | |
37 | }; | |
38 | ||
88ae23e7 ZW |
39 | /* Stack of conditionals currently in progress |
40 | (including both successful and failing conditionals). */ | |
41 | ||
42 | struct if_stack | |
43 | { | |
44 | struct if_stack *next; | |
93c80368 NB |
45 | cpp_lexer_pos pos; /* line and column where condition started */ |
46 | const cpp_hashnode *mi_cmacro;/* macro name for #ifndef around entire file */ | |
b528a07e | 47 | unsigned char was_skipping; /* Value of pfile->skipping before this if. */ |
168d3732 | 48 | int type; /* type of last directive seen in this group */ |
88ae23e7 | 49 | }; |
88ae23e7 | 50 | |
93c80368 NB |
51 | /* Values for the origin field of struct directive. KANDR directives |
52 | come from traditional (K&R) C. STDC89 directives come from the | |
53 | 1989 C standard. EXTENSION directives are extensions. */ | |
54 | #define KANDR 0 | |
55 | #define STDC89 1 | |
56 | #define EXTENSION 2 | |
57 | ||
58 | /* Values for the flags field of struct directive. COND indicates a | |
59 | conditional; IF_COND an opening conditional. INCL means to treat | |
60 | "..." and <...> as q-char and h-char sequences respectively. IN_I | |
61 | means this directive should be handled even if -fpreprocessed is in | |
62 | effect (these are the directives with callback hooks). */ | |
63 | #define COND (1 << 0) | |
64 | #define IF_COND (1 << 1) | |
65 | #define INCL (1 << 2) | |
66 | #define IN_I (1 << 3) | |
67 | ||
68 | /* Defines one #-directive, including how to handle it. */ | |
69 | typedef void (*directive_handler) PARAMS ((cpp_reader *)); | |
70 | typedef struct directive directive; | |
71 | struct directive | |
72 | { | |
73 | directive_handler handler; /* Function to handle directive. */ | |
74 | const U_CHAR *name; /* Name of directive. */ | |
75 | unsigned short length; /* Length of name. */ | |
76 | unsigned char origin; /* Origin of directive. */ | |
77 | unsigned char flags; /* Flags describing this directive. */ | |
78 | }; | |
79 | ||
1316f1f7 ZW |
80 | /* Forward declarations. */ |
81 | ||
93c80368 NB |
82 | static void skip_rest_of_line PARAMS ((cpp_reader *)); |
83 | static void check_eol PARAMS ((cpp_reader *)); | |
fe6c2db9 NB |
84 | static void start_directive PARAMS ((cpp_reader *)); |
85 | static void end_directive PARAMS ((cpp_reader *, int)); | |
93c80368 | 86 | static void run_directive PARAMS ((cpp_reader *, int, |
7b03adc6 | 87 | const char *, size_t, |
93c80368 NB |
88 | const char *)); |
89 | static int glue_header_name PARAMS ((cpp_reader *, cpp_token *)); | |
90 | static int parse_include PARAMS ((cpp_reader *, cpp_token *)); | |
041c3194 ZW |
91 | static void push_conditional PARAMS ((cpp_reader *, int, int, |
92 | const cpp_hashnode *)); | |
c71f835b ZW |
93 | static int read_line_number PARAMS ((cpp_reader *, int *)); |
94 | static int strtoul_for_line PARAMS ((const U_CHAR *, unsigned int, | |
041c3194 | 95 | unsigned long *)); |
29b10746 | 96 | static void do_diagnostic PARAMS ((cpp_reader *, enum error_type, int)); |
b528a07e | 97 | static cpp_hashnode *lex_macro_node PARAMS ((cpp_reader *)); |
93c80368 NB |
98 | static void do_pragma_once PARAMS ((cpp_reader *)); |
99 | static void do_pragma_poison PARAMS ((cpp_reader *)); | |
100 | static void do_pragma_system_header PARAMS ((cpp_reader *)); | |
101 | static void do_pragma_dependency PARAMS ((cpp_reader *)); | |
a5c3cccd NB |
102 | static int get__Pragma_string PARAMS ((cpp_reader *, cpp_token *)); |
103 | static unsigned char *destringize PARAMS ((const cpp_string *, | |
104 | unsigned int *)); | |
93c80368 NB |
105 | static int parse_answer PARAMS ((cpp_reader *, struct answer **, int)); |
106 | static cpp_hashnode *parse_assertion PARAMS ((cpp_reader *, struct answer **, | |
107 | int)); | |
108 | static struct answer ** find_answer PARAMS ((cpp_hashnode *, | |
109 | const struct answer *)); | |
86368122 | 110 | static void handle_assertion PARAMS ((cpp_reader *, const char *, int)); |
d481b69b | 111 | |
168d3732 ZW |
112 | /* This is the table of directive handlers. It is ordered by |
113 | frequency of occurrence; the numbers at the end are directive | |
114 | counts from all the source code I have lying around (egcs and libc | |
115 | CVS as of 1999-05-18, plus grub-0.5.91, linux-2.2.9, and | |
93c80368 NB |
116 | pcmcia-cs-3.0.9). This is no longer important as directive lookup |
117 | is now O(1). All extensions other than #warning and #include_next | |
118 | are deprecated. The name is where the extension appears to have | |
119 | come from. */ | |
168d3732 | 120 | |
93c80368 NB |
121 | #define DIRECTIVE_TABLE \ |
122 | D(define, T_DEFINE = 0, KANDR, IN_I) /* 270554 */ \ | |
123 | D(include, T_INCLUDE, KANDR, INCL) /* 52262 */ \ | |
124 | D(endif, T_ENDIF, KANDR, COND) /* 45855 */ \ | |
125 | D(ifdef, T_IFDEF, KANDR, COND | IF_COND) /* 22000 */ \ | |
126 | D(if, T_IF, KANDR, COND | IF_COND) /* 18162 */ \ | |
127 | D(else, T_ELSE, KANDR, COND) /* 9863 */ \ | |
128 | D(ifndef, T_IFNDEF, KANDR, COND | IF_COND) /* 9675 */ \ | |
129 | D(undef, T_UNDEF, KANDR, IN_I) /* 4837 */ \ | |
130 | D(line, T_LINE, KANDR, IN_I) /* 2465 */ \ | |
131 | D(elif, T_ELIF, KANDR, COND) /* 610 */ \ | |
132 | D(error, T_ERROR, STDC89, 0) /* 475 */ \ | |
133 | D(pragma, T_PRAGMA, STDC89, IN_I) /* 195 */ \ | |
134 | D(warning, T_WARNING, EXTENSION, 0) /* 22 */ \ | |
135 | D(include_next, T_INCLUDE_NEXT, EXTENSION, INCL) /* 19 */ \ | |
136 | D(ident, T_IDENT, EXTENSION, IN_I) /* 11 */ \ | |
137 | D(import, T_IMPORT, EXTENSION, INCL) /* 0 ObjC */ \ | |
138 | D(assert, T_ASSERT, EXTENSION, 0) /* 0 SVR4 */ \ | |
139 | D(unassert, T_UNASSERT, EXTENSION, 0) /* 0 SVR4 */ \ | |
140 | SCCS_ENTRY /* 0 SVR4? */ | |
168d3732 | 141 | |
07aa0b04 ZW |
142 | /* #sccs is not always recognized. */ |
143 | #ifdef SCCS_DIRECTIVE | |
041c3194 | 144 | # define SCCS_ENTRY D(sccs, T_SCCS, EXTENSION, 0) |
07aa0b04 ZW |
145 | #else |
146 | # define SCCS_ENTRY /* nothing */ | |
147 | #endif | |
148 | ||
168d3732 ZW |
149 | /* Use the table to generate a series of prototypes, an enum for the |
150 | directive names, and an array of directive handlers. */ | |
151 | ||
152 | /* The directive-processing functions are declared to return int | |
153 | instead of void, because some old compilers have trouble with | |
154 | pointers to functions returning void. */ | |
155 | ||
7c32404c | 156 | /* Don't invoke CONCAT2 with any whitespace or K&R cc will fail. */ |
711b8824 | 157 | #define D(name, t, o, f) static void CONCAT2(do_,name) PARAMS ((cpp_reader *)); |
168d3732 ZW |
158 | DIRECTIVE_TABLE |
159 | #undef D | |
160 | ||
041c3194 | 161 | #define D(n, tag, o, f) tag, |
168d3732 ZW |
162 | enum |
163 | { | |
93c80368 | 164 | T_BAD_DIRECTIVE, |
168d3732 ZW |
165 | DIRECTIVE_TABLE |
166 | N_DIRECTIVES | |
7f2935c7 | 167 | }; |
168d3732 ZW |
168 | #undef D |
169 | ||
7c32404c | 170 | /* Don't invoke CONCAT2 with any whitespace or K&R cc will fail. */ |
041c3194 | 171 | #define D(name, t, origin, flags) \ |
12cf91fe | 172 | { CONCAT2(do_,name), (const U_CHAR *) STRINGX(name), \ |
041c3194 | 173 | sizeof STRINGX(name) - 1, origin, flags }, |
93c80368 | 174 | static const directive dtable[] = |
168d3732 ZW |
175 | { |
176 | DIRECTIVE_TABLE | |
177 | }; | |
178 | #undef D | |
179 | #undef DIRECTIVE_TABLE | |
7f2935c7 | 180 | |
93c80368 NB |
181 | /* Skip any remaining tokens in a directive. */ |
182 | static void | |
183 | skip_rest_of_line (pfile) | |
041c3194 | 184 | cpp_reader *pfile; |
c5a04734 | 185 | { |
93c80368 NB |
186 | cpp_token token; |
187 | ||
7f2f1a66 | 188 | /* Discard all input lookaheads. */ |
b528a07e NB |
189 | while (pfile->la_read) |
190 | _cpp_release_lookahead (pfile); | |
191 | ||
93c80368 NB |
192 | /* Discard all stacked contexts. */ |
193 | while (pfile->context != &pfile->base_context) | |
194 | _cpp_pop_context (pfile); | |
195 | ||
b528a07e | 196 | /* Sweep up all tokens remaining on the line. */ |
93c80368 | 197 | pfile->state.prevent_expansion++; |
4c2b647d | 198 | while (!pfile->state.next_bol) |
b528a07e | 199 | _cpp_lex_token (pfile, &token); |
93c80368 NB |
200 | pfile->state.prevent_expansion--; |
201 | } | |
c5a04734 | 202 | |
93c80368 NB |
203 | /* Ensure there are no stray tokens at the end of a directive. */ |
204 | static void | |
205 | check_eol (pfile) | |
206 | cpp_reader *pfile; | |
207 | { | |
4c2b647d | 208 | if (!pfile->state.next_bol) |
0d9f234d | 209 | { |
93c80368 | 210 | cpp_token token; |
0d9f234d | 211 | |
93c80368 NB |
212 | _cpp_lex_token (pfile, &token); |
213 | if (token.type != CPP_EOF) | |
214 | cpp_pedwarn (pfile, "extra tokens at end of #%s directive", | |
215 | pfile->directive->name); | |
0d9f234d | 216 | } |
93c80368 NB |
217 | } |
218 | ||
fe6c2db9 NB |
219 | /* Called when entering a directive, _Pragma or command-line directive. */ |
220 | static void | |
221 | start_directive (pfile) | |
93c80368 | 222 | cpp_reader *pfile; |
93c80368 | 223 | { |
b528a07e | 224 | cpp_buffer *buffer = pfile->buffer; |
0d9f234d | 225 | |
7f2f1a66 NB |
226 | /* Setup in-directive state. */ |
227 | pfile->state.in_directive = 1; | |
228 | pfile->state.save_comments = 0; | |
229 | ||
93c80368 NB |
230 | /* Some handlers need the position of the # for diagnostics. */ |
231 | pfile->directive_pos = pfile->lexer_pos; | |
c5a04734 | 232 | |
7f2f1a66 | 233 | /* Don't save directive tokens for external clients. */ |
fe6c2db9 | 234 | pfile->la_saved = pfile->la_write; |
7f2f1a66 | 235 | pfile->la_write = 0; |
0d9f234d | 236 | |
fe6c2db9 NB |
237 | /* Turn off skipping. */ |
238 | buffer->was_skipping = pfile->skipping; | |
239 | pfile->skipping = 0; | |
240 | } | |
241 | ||
242 | /* Called when leaving a directive, _Pragma or command-line directive. */ | |
243 | static void | |
244 | end_directive (pfile, skip_line) | |
245 | cpp_reader *pfile; | |
246 | int skip_line; | |
247 | { | |
248 | cpp_buffer *buffer = pfile->buffer; | |
249 | ||
250 | /* Restore pfile->skipping before skip_rest_of_line. This avoids | |
251 | warning about poisoned identifiers in skipped #error lines. */ | |
252 | pfile->skipping = buffer->was_skipping; | |
253 | ||
254 | /* We don't skip for an assembler #. */ | |
255 | if (skip_line) | |
256 | skip_rest_of_line (pfile); | |
257 | ||
258 | /* Restore state. */ | |
259 | pfile->la_write = pfile->la_saved; | |
260 | pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); | |
261 | pfile->state.in_directive = 0; | |
262 | pfile->state.angled_headers = 0; | |
263 | pfile->directive = 0; | |
264 | } | |
265 | ||
266 | /* Check if a token's name matches that of a known directive. Put in | |
267 | this file to save exporting dtable and other unneeded information. */ | |
268 | int | |
269 | _cpp_handle_directive (pfile, indented) | |
270 | cpp_reader *pfile; | |
271 | int indented; | |
272 | { | |
273 | cpp_buffer *buffer = pfile->buffer; | |
274 | const directive *dir = 0; | |
275 | cpp_token dname; | |
276 | int skip = 1; | |
277 | ||
278 | start_directive (pfile); | |
279 | ||
93c80368 NB |
280 | /* Lex the directive name directly. */ |
281 | _cpp_lex_token (pfile, &dname); | |
0d9f234d | 282 | |
93c80368 | 283 | if (dname.type == CPP_NAME) |
0d9f234d | 284 | { |
93c80368 NB |
285 | unsigned int index = dname.val.node->directive_index; |
286 | if (index) | |
287 | dir = &dtable[index - 1]; | |
0d9f234d | 288 | } |
93c80368 | 289 | else if (dname.type == CPP_NUMBER) |
0d9f234d | 290 | { |
93c80368 NB |
291 | /* # followed by a number is equivalent to #line. Do not |
292 | recognize this form in assembly language source files or | |
293 | skipped conditional groups. Complain about this form if | |
294 | we're being pedantic, but not if this is regurgitated input | |
295 | (preprocessed or fed back in by the C++ frontend). */ | |
bdb05a7b | 296 | if (! buffer->was_skipping && CPP_OPTION (pfile, lang) != CLK_ASM) |
0d9f234d | 297 | { |
93c80368 NB |
298 | dir = &dtable[T_LINE]; |
299 | _cpp_push_token (pfile, &dname, &pfile->directive_pos); | |
b528a07e | 300 | if (CPP_PEDANTIC (pfile) && buffer->inc |
93c80368 NB |
301 | && ! CPP_OPTION (pfile, preprocessed)) |
302 | cpp_pedwarn (pfile, "# followed by integer"); | |
0d9f234d | 303 | } |
93c80368 | 304 | } |
0d9f234d | 305 | |
93c80368 NB |
306 | pfile->directive = dir; |
307 | if (dir) | |
308 | { | |
309 | /* Make sure we lex headers correctly, whether skipping or not. */ | |
310 | pfile->state.angled_headers = dir->flags & INCL; | |
0d9f234d | 311 | |
93c80368 NB |
312 | /* If we are rescanning preprocessed input, only directives tagged |
313 | with IN_I are honored, and the warnings below are suppressed. */ | |
314 | if (! CPP_OPTION (pfile, preprocessed) || dir->flags & IN_I) | |
315 | { | |
316 | /* Traditionally, a directive is ignored unless its # is in | |
317 | column 1. Therefore in code intended to work with K+R | |
318 | compilers, directives added by C89 must have their # | |
319 | indented, and directives present in traditional C must | |
320 | not. This is true even of directives in skipped | |
321 | conditional blocks. */ | |
322 | if (CPP_WTRADITIONAL (pfile)) | |
323 | { | |
324 | if (indented && dir->origin == KANDR) | |
325 | cpp_warning (pfile, | |
326 | "traditional C ignores #%s with the # indented", | |
327 | dir->name); | |
328 | else if (!indented && dir->origin != KANDR) | |
329 | cpp_warning (pfile, | |
330 | "suggest hiding #%s from traditional C with an indented #", | |
331 | dir->name); | |
332 | } | |
333 | ||
334 | /* If we are skipping a failed conditional group, all | |
335 | non-conditional directives are ignored. */ | |
fe6c2db9 | 336 | if (! buffer->was_skipping || (dir->flags & COND)) |
93c80368 NB |
337 | { |
338 | /* Issue -pedantic warnings for extensions. */ | |
339 | if (CPP_PEDANTIC (pfile) && dir->origin == EXTENSION) | |
340 | cpp_pedwarn (pfile, "#%s is a GCC extension", dir->name); | |
341 | ||
342 | /* If we have a directive that is not an opening | |
343 | conditional, invalidate any control macro. */ | |
344 | if (! (dir->flags & IF_COND)) | |
345 | pfile->mi_state = MI_FAILED; | |
346 | ||
347 | (*dir->handler) (pfile); | |
348 | } | |
349 | } | |
350 | } | |
fe6c2db9 | 351 | else if (dname.type != CPP_EOF && ! pfile->skipping) |
93c80368 NB |
352 | { |
353 | /* An unknown directive. Don't complain about it in assembly | |
354 | source: we don't know where the comments are, and # may | |
355 | introduce assembler pseudo-ops. Don't complain about invalid | |
356 | directives in skipped conditional groups (6.10 p4). */ | |
bdb05a7b | 357 | if (CPP_OPTION (pfile, lang) == CLK_ASM) |
93c80368 NB |
358 | { |
359 | /* Output the # and lookahead token for the assembler. */ | |
93c80368 | 360 | _cpp_push_token (pfile, &dname, &pfile->directive_pos); |
fe6c2db9 | 361 | skip = 0; |
93c80368 | 362 | } |
b528a07e | 363 | else |
93c80368 NB |
364 | cpp_error (pfile, "invalid preprocessing directive #%s", |
365 | cpp_token_as_text (pfile, &dname)); | |
0d9f234d NB |
366 | } |
367 | ||
fe6c2db9 NB |
368 | end_directive (pfile, skip); |
369 | return skip; | |
041c3194 | 370 | } |
7f2935c7 | 371 | |
93c80368 NB |
372 | /* Directive handler wrapper used by the command line option |
373 | processor. */ | |
374 | static void | |
375 | run_directive (pfile, dir_no, buf, count, name) | |
7f2935c7 | 376 | cpp_reader *pfile; |
93c80368 NB |
377 | int dir_no; |
378 | const char *buf; | |
379 | size_t count; | |
380 | const char *name; | |
3fdc651f | 381 | { |
a0a9606d | 382 | unsigned int output_line = pfile->lexer_pos.output_line; |
fe6c2db9 | 383 | cpp_buffer *buffer = cpp_push_buffer (pfile, (const U_CHAR *) buf, count); |
a0a9606d | 384 | |
fe6c2db9 | 385 | if (buffer) |
93c80368 | 386 | { |
fe6c2db9 | 387 | const struct directive *dir = &dtable[dir_no]; |
93c80368 NB |
388 | |
389 | if (name) | |
fe6c2db9 | 390 | buffer->nominal_fname = name; |
93c80368 | 391 | else |
fe6c2db9 | 392 | buffer->nominal_fname = _("<command line>"); |
a5c3cccd NB |
393 | |
394 | /* For _Pragma, the text is passed through preprocessing stage 3 | |
395 | only, i.e. no trigraphs, no escaped newline removal, and no | |
396 | macro expansion. Do the same for command-line directives. */ | |
fe6c2db9 NB |
397 | buffer->from_stage3 = 1; |
398 | ||
399 | if (dir_no == T_PRAGMA) | |
400 | { | |
401 | /* A kludge to avoid line markers for _Pragma. */ | |
402 | pfile->lexer_pos.output_line = output_line; | |
403 | /* Avoid interpretation of directives in a _Pragma string. */ | |
404 | pfile->state.next_bol = 0; | |
405 | } | |
406 | ||
407 | start_directive (pfile); | |
a5c3cccd | 408 | pfile->state.prevent_expansion++; |
93c80368 | 409 | (void) (*dir->handler) (pfile); |
a5c3cccd | 410 | pfile->state.prevent_expansion--; |
fe6c2db9 NB |
411 | check_eol (pfile); |
412 | end_directive (pfile, 1); | |
40c79d58 | 413 | |
93c80368 NB |
414 | cpp_pop_buffer (pfile); |
415 | } | |
416 | } | |
417 | ||
418 | /* Checks for validity the macro name in #define, #undef, #ifdef and | |
419 | #ifndef directives. */ | |
041c3194 | 420 | static cpp_hashnode * |
93c80368 | 421 | lex_macro_node (pfile) |
041c3194 ZW |
422 | cpp_reader *pfile; |
423 | { | |
93c80368 | 424 | cpp_token token; |
ff2b53ef | 425 | |
93c80368 NB |
426 | /* Lex the macro name directly. */ |
427 | _cpp_lex_token (pfile, &token); | |
ea4a453b | 428 | |
92936ecf ZW |
429 | /* The token immediately after #define must be an identifier. That |
430 | identifier is not allowed to be "defined". See predefined macro | |
431 | names (6.10.8.4). In C++, it is not allowed to be any of the | |
432 | <iso646.h> macro names (which are keywords in C++) either. */ | |
433 | ||
93c80368 | 434 | if (token.type != CPP_NAME) |
7f2935c7 | 435 | { |
93c80368 NB |
436 | if (token.type == CPP_EOF) |
437 | cpp_error (pfile, "no macro name given in #%s directive", | |
438 | pfile->directive->name); | |
439 | else if (token.flags & NAMED_OP) | |
440 | cpp_error (pfile, | |
441 | "\"%s\" cannot be used as a macro name as it is an operator in C++", | |
442 | token.val.node->name); | |
92936ecf | 443 | else |
93c80368 | 444 | cpp_error (pfile, "macro names must be identifiers"); |
ba89d661 | 445 | } |
93c80368 | 446 | else |
07aa0b04 | 447 | { |
93c80368 NB |
448 | cpp_hashnode *node = token.val.node; |
449 | ||
450 | /* In Objective C, some keywords begin with '@', but general | |
451 | identifiers do not, and you're not allowed to #define them. */ | |
452 | if (node == pfile->spec_nodes.n_defined || node->name[0] == '@') | |
453 | cpp_error (pfile, "\"%s\" cannot be used as a macro name", node->name); | |
454 | else if (!(node->flags & NODE_POISONED)) | |
455 | return node; | |
07aa0b04 ZW |
456 | } |
457 | ||
93c80368 | 458 | return 0; |
7f2935c7 | 459 | } |
7f2935c7 | 460 | |
93c80368 | 461 | /* Process a #define directive. Most work is done in cppmacro.c. */ |
711b8824 | 462 | static void |
168d3732 | 463 | do_define (pfile) |
7f2935c7 | 464 | cpp_reader *pfile; |
7f2935c7 | 465 | { |
93c80368 | 466 | cpp_hashnode *node = lex_macro_node (pfile); |
ff2b53ef | 467 | |
93c80368 NB |
468 | if (node) |
469 | { | |
470 | /* Use the permanent pool for storage. */ | |
471 | pfile->string_pool = &pfile->ident_pool; | |
472 | ||
473 | if (_cpp_create_definition (pfile, node)) | |
474 | if (pfile->cb.define) | |
475 | (*pfile->cb.define) (pfile, node); | |
476 | ||
477 | /* Revert to the temporary pool. */ | |
478 | pfile->string_pool = &pfile->temp_string_pool; | |
479 | } | |
041c3194 ZW |
480 | } |
481 | ||
93c80368 | 482 | /* Handle #undef. Marks the identifier NT_VOID in the hash table. */ |
711b8824 | 483 | static void |
041c3194 ZW |
484 | do_undef (pfile) |
485 | cpp_reader *pfile; | |
486 | { | |
93c80368 | 487 | cpp_hashnode *node = lex_macro_node (pfile); |
9e62c811 | 488 | |
041c3194 ZW |
489 | /* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified identifier |
490 | is not currently defined as a macro name. */ | |
93c80368 | 491 | if (node && node->type == NT_MACRO) |
9e62c811 | 492 | { |
58fea6af ZW |
493 | if (pfile->cb.undef) |
494 | (*pfile->cb.undef) (pfile, node); | |
9e62c811 | 495 | |
93c80368 | 496 | if (node->flags & NODE_BUILTIN) |
041c3194 | 497 | cpp_warning (pfile, "undefining \"%s\"", node->name); |
9e62c811 | 498 | |
041c3194 | 499 | _cpp_free_definition (node); |
9e62c811 | 500 | } |
93c80368 | 501 | check_eol (pfile); |
7f2935c7 PB |
502 | } |
503 | ||
93c80368 NB |
504 | /* Helper routine used by parse_include. Reinterpret the current line |
505 | as an h-char-sequence (< ... >); we are looking at the first token | |
506 | after the <. Returns zero on success. */ | |
507 | static int | |
508 | glue_header_name (pfile, header) | |
509 | cpp_reader *pfile; | |
510 | cpp_token *header; | |
511 | { | |
512 | cpp_token token; | |
513 | unsigned char *buffer, *token_mem; | |
514 | size_t len, total_len = 0, capacity = 1024; | |
515 | ||
516 | /* To avoid lexed tokens overwriting our glued name, we can only | |
517 | allocate from the string pool once we've lexed everything. */ | |
518 | ||
519 | buffer = (unsigned char *) xmalloc (capacity); | |
520 | for (;;) | |
521 | { | |
7f2f1a66 | 522 | cpp_get_token (pfile, &token); |
93c80368 NB |
523 | |
524 | if (token.type == CPP_GREATER || token.type == CPP_EOF) | |
525 | break; | |
526 | ||
527 | len = cpp_token_len (&token); | |
528 | if (total_len + len > capacity) | |
529 | { | |
530 | capacity = (capacity + len) * 2; | |
dd3b81b4 | 531 | buffer = (unsigned char *) xrealloc (buffer, capacity); |
93c80368 NB |
532 | } |
533 | ||
534 | if (token.flags & PREV_WHITE) | |
535 | buffer[total_len++] = ' '; | |
536 | ||
537 | total_len = cpp_spell_token (pfile, &token, &buffer[total_len]) - buffer; | |
538 | } | |
539 | ||
540 | if (token.type == CPP_EOF) | |
541 | cpp_error (pfile, "missing terminating > character"); | |
542 | else | |
543 | { | |
544 | token_mem = _cpp_pool_alloc (pfile->string_pool, total_len); | |
545 | memcpy (token_mem, buffer, total_len); | |
546 | ||
547 | header->type = CPP_HEADER_NAME; | |
548 | header->flags &= ~PREV_WHITE; | |
549 | header->val.str.len = total_len; | |
550 | header->val.str.text = token_mem; | |
551 | } | |
041c3194 | 552 | |
93c80368 NB |
553 | free ((PTR) buffer); |
554 | return token.type == CPP_EOF; | |
555 | } | |
7f2935c7 | 556 | |
93c80368 NB |
557 | /* Parse the header name of #include, #include_next, #import and |
558 | #pragma dependency. Returns zero on success. */ | |
041c3194 | 559 | static int |
93c80368 | 560 | parse_include (pfile, header) |
7f2935c7 | 561 | cpp_reader *pfile; |
93c80368 | 562 | cpp_token *header; |
7f2935c7 | 563 | { |
93c80368 NB |
564 | int is_pragma = pfile->directive == &dtable[T_PRAGMA]; |
565 | const unsigned char *dir; | |
7f2935c7 | 566 | |
93c80368 NB |
567 | if (is_pragma) |
568 | dir = U"pragma dependency"; | |
569 | else | |
570 | dir = pfile->directive->name; | |
571 | ||
572 | /* Allow macro expansion. */ | |
573 | cpp_get_token (pfile, header); | |
574 | if (header->type != CPP_STRING && header->type != CPP_HEADER_NAME) | |
7f2935c7 | 575 | { |
93c80368 | 576 | if (header->type != CPP_LESS) |
041c3194 ZW |
577 | { |
578 | cpp_error (pfile, "#%s expects \"FILENAME\" or <FILENAME>", dir); | |
579 | return 1; | |
580 | } | |
93c80368 NB |
581 | if (glue_header_name (pfile, header)) |
582 | return 1; | |
7f2935c7 | 583 | } |
93c80368 NB |
584 | |
585 | if (header->val.str.len == 0) | |
7f2935c7 | 586 | { |
041c3194 ZW |
587 | cpp_error (pfile, "empty file name in #%s", dir); |
588 | return 1; | |
7f2935c7 | 589 | } |
7f2935c7 | 590 | |
93c80368 NB |
591 | if (!is_pragma) |
592 | { | |
593 | check_eol (pfile); | |
594 | /* Get out of macro context, if we are. */ | |
595 | skip_rest_of_line (pfile); | |
596 | if (pfile->cb.include) | |
597 | (*pfile->cb.include) (pfile, dir, header); | |
598 | } | |
58fea6af | 599 | |
041c3194 | 600 | return 0; |
168d3732 | 601 | } |
3caee4a8 | 602 | |
711b8824 | 603 | static void |
168d3732 ZW |
604 | do_include (pfile) |
605 | cpp_reader *pfile; | |
606 | { | |
93c80368 | 607 | cpp_token header; |
7f2935c7 | 608 | |
93c80368 NB |
609 | if (!parse_include (pfile, &header)) |
610 | _cpp_execute_include (pfile, &header, 0, 0); | |
168d3732 | 611 | } |
e8037d57 | 612 | |
711b8824 | 613 | static void |
168d3732 ZW |
614 | do_import (pfile) |
615 | cpp_reader *pfile; | |
616 | { | |
93c80368 | 617 | cpp_token header; |
168d3732 | 618 | |
317639a8 | 619 | if (!pfile->import_warning && CPP_OPTION (pfile, warn_import)) |
7f2935c7 | 620 | { |
168d3732 ZW |
621 | pfile->import_warning = 1; |
622 | cpp_warning (pfile, | |
623 | "#import is obsolete, use an #ifndef wrapper in the header file"); | |
7f2935c7 | 624 | } |
7f2935c7 | 625 | |
93c80368 NB |
626 | if (!parse_include (pfile, &header)) |
627 | _cpp_execute_include (pfile, &header, 1, 0); | |
168d3732 | 628 | } |
7f2935c7 | 629 | |
711b8824 | 630 | static void |
168d3732 ZW |
631 | do_include_next (pfile) |
632 | cpp_reader *pfile; | |
633 | { | |
93c80368 | 634 | cpp_token header; |
168d3732 | 635 | struct file_name_list *search_start = 0; |
7f2935c7 | 636 | |
93c80368 | 637 | if (parse_include (pfile, &header)) |
711b8824 | 638 | return; |
168d3732 | 639 | |
041c3194 ZW |
640 | /* For #include_next, skip in the search path past the dir in which |
641 | the current file was found. If this is the last directory in the | |
642 | search path, don't include anything. If the current file was | |
643 | specified with an absolute path, use the normal search logic. If | |
644 | this is the primary source file, use the normal search logic and | |
645 | generate a warning. */ | |
168d3732 | 646 | if (CPP_PREV_BUFFER (CPP_BUFFER (pfile))) |
7f2935c7 | 647 | { |
c31a6508 | 648 | if (CPP_BUFFER (pfile)->inc->foundhere) |
041c3194 ZW |
649 | { |
650 | search_start = CPP_BUFFER (pfile)->inc->foundhere->next; | |
651 | if (!search_start) | |
711b8824 | 652 | return; |
041c3194 | 653 | } |
7f2935c7 | 654 | } |
168d3732 ZW |
655 | else |
656 | cpp_warning (pfile, "#include_next in primary source file"); | |
657 | ||
93c80368 | 658 | _cpp_execute_include (pfile, &header, 0, search_start); |
7f2935c7 | 659 | } |
7f2935c7 | 660 | |
d3a34a0a JM |
661 | /* Subroutine of do_line. Read next token from PFILE without adding it to |
662 | the output buffer. If it is a number between 1 and 4, store it in *NUM | |
663 | and return 1; otherwise, return 0 and complain if we aren't at the end | |
664 | of the directive. */ | |
665 | ||
666 | static int | |
667 | read_line_number (pfile, num) | |
668 | cpp_reader *pfile; | |
669 | int *num; | |
670 | { | |
93c80368 NB |
671 | cpp_token token; |
672 | unsigned int val; | |
d3a34a0a | 673 | |
93c80368 NB |
674 | _cpp_lex_token (pfile, &token); |
675 | if (token.type == CPP_NUMBER && token.val.str.len == 1) | |
d3a34a0a | 676 | { |
93c80368 NB |
677 | val = token.val.str.text[0] - '1'; |
678 | if (val <= 3) | |
679 | { | |
680 | *num = val + 1; | |
681 | return 1; | |
682 | } | |
d3a34a0a | 683 | } |
93c80368 NB |
684 | |
685 | if (token.type != CPP_EOF) | |
686 | cpp_error (pfile, "invalid format #line"); | |
687 | return 0; | |
d3a34a0a JM |
688 | } |
689 | ||
041c3194 ZW |
690 | /* Another subroutine of do_line. Convert a number in STR, of length |
691 | LEN, to binary; store it in NUMP, and return 0 if the number was | |
5ef865d5 | 692 | well-formed, 1 if not. Temporary, hopefully. */ |
041c3194 ZW |
693 | static int |
694 | strtoul_for_line (str, len, nump) | |
695 | const U_CHAR *str; | |
696 | unsigned int len; | |
697 | unsigned long *nump; | |
698 | { | |
699 | unsigned long reg = 0; | |
700 | U_CHAR c; | |
701 | while (len--) | |
702 | { | |
703 | c = *str++; | |
704 | if (!ISDIGIT (c)) | |
705 | return 1; | |
706 | reg *= 10; | |
707 | reg += c - '0'; | |
708 | } | |
709 | *nump = reg; | |
710 | return 0; | |
711 | } | |
712 | ||
6de1e2a9 ZW |
713 | /* Interpret #line command. |
714 | Note that the filename string (if any) is treated as if it were an | |
715 | include filename. That means no escape handling. */ | |
7f2935c7 | 716 | |
711b8824 | 717 | static void |
168d3732 | 718 | do_line (pfile) |
7f2935c7 | 719 | cpp_reader *pfile; |
7f2935c7 | 720 | { |
6de1e2a9 | 721 | cpp_buffer *ip = CPP_BUFFER (pfile); |
93c80368 | 722 | unsigned long new_lineno; |
041c3194 ZW |
723 | /* C99 raised the minimum limit on #line numbers. */ |
724 | unsigned int cap = CPP_OPTION (pfile, c99) ? 2147483647 : 32767; | |
9ec7291f | 725 | int enter = 0, leave = 0, rename = 0; |
93c80368 NB |
726 | cpp_token token; |
727 | ||
728 | /* #line commands expand macros. */ | |
7f2f1a66 | 729 | cpp_get_token (pfile, &token); |
93c80368 NB |
730 | if (token.type != CPP_NUMBER |
731 | || strtoul_for_line (token.val.str.text, token.val.str.len, &new_lineno)) | |
7f2935c7 | 732 | { |
93c80368 NB |
733 | cpp_error (pfile, "\"%s\" after #line is not a positive integer", |
734 | cpp_token_as_text (pfile, &token)); | |
9ec7291f | 735 | return; |
6de1e2a9 | 736 | } |
7f2935c7 | 737 | |
041c3194 ZW |
738 | if (CPP_PEDANTIC (pfile) && (new_lineno == 0 || new_lineno > cap)) |
739 | cpp_pedwarn (pfile, "line number out of range"); | |
7f2935c7 | 740 | |
7f2f1a66 | 741 | cpp_get_token (pfile, &token); |
add7091b | 742 | |
93c80368 | 743 | if (token.type != CPP_EOF) |
5538ada6 | 744 | { |
93c80368 NB |
745 | char *fname; |
746 | unsigned int len; | |
747 | int action_number = 0; | |
5538ada6 | 748 | |
93c80368 NB |
749 | if (token.type != CPP_STRING) |
750 | { | |
751 | cpp_error (pfile, "\"%s\" is not a valid filename", | |
752 | cpp_token_as_text (pfile, &token)); | |
753 | return; | |
754 | } | |
7f2935c7 | 755 | |
93c80368 NB |
756 | len = token.val.str.len; |
757 | fname = alloca (len + 1); | |
758 | memcpy (fname, token.val.str.text, len); | |
759 | fname[len] = '\0'; | |
760 | ||
761 | if (strcmp (fname, ip->nominal_fname)) | |
762 | { | |
763 | rename = 1; | |
764 | if (!strcmp (fname, ip->inc->name)) | |
765 | ip->nominal_fname = ip->inc->name; | |
766 | else | |
767 | ip->nominal_fname = _cpp_fake_include (pfile, fname); | |
768 | } | |
941e09b6 | 769 | |
93c80368 NB |
770 | if (read_line_number (pfile, &action_number) != 0) |
771 | { | |
9232b7d9 | 772 | if (! CPP_OPTION (pfile, preprocessed) && CPP_PEDANTIC (pfile)) |
93c80368 | 773 | cpp_pedwarn (pfile, "extra tokens at end of #line directive"); |
ff2b53ef | 774 | |
93c80368 NB |
775 | if (action_number == 1) |
776 | { | |
777 | enter = 1; | |
778 | cpp_make_system_header (pfile, ip, 0); | |
779 | read_line_number (pfile, &action_number); | |
780 | } | |
781 | else if (action_number == 2) | |
782 | { | |
783 | leave = 1; | |
784 | cpp_make_system_header (pfile, ip, 0); | |
785 | read_line_number (pfile, &action_number); | |
786 | } | |
787 | if (action_number == 3) | |
788 | { | |
789 | cpp_make_system_header (pfile, ip, 1); | |
790 | read_line_number (pfile, &action_number); | |
791 | } | |
792 | if (action_number == 4) | |
793 | { | |
794 | cpp_make_system_header (pfile, ip, 2); | |
795 | read_line_number (pfile, &action_number); | |
796 | } | |
797 | } | |
798 | check_eol (pfile); | |
041c3194 | 799 | } |
7f2935c7 | 800 | |
93c80368 NB |
801 | /* Our line number is incremented after the directive is processed. */ |
802 | ip->lineno = new_lineno - 1; | |
803 | pfile->lexer_pos.output_line = ip->lineno; | |
58fea6af ZW |
804 | if (enter && pfile->cb.enter_file) |
805 | (*pfile->cb.enter_file) (pfile); | |
806 | if (leave && pfile->cb.leave_file) | |
807 | (*pfile->cb.leave_file) (pfile); | |
9ec7291f ZW |
808 | if (rename && pfile->cb.rename_file) |
809 | (*pfile->cb.rename_file) (pfile); | |
7f2935c7 | 810 | } |
941e09b6 | 811 | |
7f2935c7 | 812 | /* |
838f313b NB |
813 | * Report a warning or error detected by the program we are |
814 | * processing. Use the directive's tokens in the error message. | |
7f2935c7 PB |
815 | */ |
816 | ||
711b8824 | 817 | static void |
29b10746 | 818 | do_diagnostic (pfile, code, print_dir) |
7f2935c7 | 819 | cpp_reader *pfile; |
838f313b | 820 | enum error_type code; |
29b10746 | 821 | int print_dir; |
7f2935c7 | 822 | { |
93c80368 | 823 | if (_cpp_begin_message (pfile, code, NULL, 0)) |
58fea6af | 824 | { |
29b10746 NB |
825 | if (print_dir) |
826 | fprintf (stderr, "#%s ", pfile->directive->name); | |
93c80368 NB |
827 | pfile->state.prevent_expansion++; |
828 | cpp_output_line (pfile, stderr); | |
829 | pfile->state.prevent_expansion--; | |
58fea6af | 830 | } |
7f2935c7 PB |
831 | } |
832 | ||
838f313b NB |
833 | static void |
834 | do_error (pfile) | |
835 | cpp_reader *pfile; | |
836 | { | |
29b10746 | 837 | do_diagnostic (pfile, ERROR, 1); |
838f313b | 838 | } |
7f2935c7 | 839 | |
711b8824 | 840 | static void |
168d3732 | 841 | do_warning (pfile) |
7f2935c7 | 842 | cpp_reader *pfile; |
7f2935c7 | 843 | { |
29b10746 | 844 | do_diagnostic (pfile, WARNING, 1); |
7f2935c7 PB |
845 | } |
846 | ||
a2a76ce7 | 847 | /* Report program identification. */ |
7f2935c7 | 848 | |
711b8824 | 849 | static void |
168d3732 | 850 | do_ident (pfile) |
7f2935c7 | 851 | cpp_reader *pfile; |
7f2935c7 | 852 | { |
93c80368 | 853 | cpp_token str; |
58fea6af | 854 | |
7f2f1a66 | 855 | cpp_get_token (pfile, &str); |
93c80368 NB |
856 | if (str.type != CPP_STRING) |
857 | cpp_error (pfile, "invalid #ident"); | |
858 | else if (pfile->cb.ident) | |
859 | (*pfile->cb.ident) (pfile, &str.val.str); | |
a2a76ce7 | 860 | |
93c80368 | 861 | check_eol (pfile); |
7f2935c7 PB |
862 | } |
863 | ||
a2a76ce7 ZW |
864 | /* Pragmata handling. We handle some of these, and pass the rest on |
865 | to the front end. C99 defines three pragmas and says that no macro | |
866 | expansion is to be performed on them; whether or not macro | |
867 | expansion happens for other pragmas is implementation defined. | |
a949941c | 868 | This implementation never macro-expands the text after #pragma. */ |
a2a76ce7 ZW |
869 | |
870 | /* Sub-handlers for the pragmas needing treatment here. | |
871 | They return 1 if the token buffer is to be popped, 0 if not. */ | |
82443371 NS |
872 | struct pragma_entry |
873 | { | |
58fea6af | 874 | struct pragma_entry *next; |
041c3194 | 875 | const char *name; |
58fea6af ZW |
876 | size_t len; |
877 | int isnspace; | |
878 | union { | |
879 | void (*handler) PARAMS ((cpp_reader *)); | |
880 | struct pragma_entry *space; | |
881 | } u; | |
82443371 NS |
882 | }; |
883 | ||
58fea6af ZW |
884 | void |
885 | cpp_register_pragma (pfile, space, name, handler) | |
886 | cpp_reader *pfile; | |
887 | const char *space; | |
888 | const char *name; | |
889 | void (*handler) PARAMS ((cpp_reader *)); | |
82443371 | 890 | { |
58fea6af ZW |
891 | struct pragma_entry **x, *new; |
892 | size_t len; | |
82443371 | 893 | |
58fea6af ZW |
894 | x = &pfile->pragmas; |
895 | if (space) | |
896 | { | |
897 | struct pragma_entry *p = pfile->pragmas; | |
898 | len = strlen (space); | |
899 | while (p) | |
900 | { | |
901 | if (p->isnspace && p->len == len && !memcmp (p->name, space, len)) | |
902 | { | |
903 | x = &p->u.space; | |
904 | goto found; | |
905 | } | |
906 | p = p->next; | |
907 | } | |
908 | cpp_ice (pfile, "unknown #pragma namespace %s", space); | |
909 | return; | |
910 | } | |
911 | ||
912 | found: | |
913 | new = xnew (struct pragma_entry); | |
914 | new->name = name; | |
915 | new->len = strlen (name); | |
916 | new->isnspace = 0; | |
917 | new->u.handler = handler; | |
918 | ||
919 | new->next = *x; | |
920 | *x = new; | |
921 | } | |
82443371 | 922 | |
58fea6af ZW |
923 | void |
924 | cpp_register_pragma_space (pfile, space) | |
82443371 | 925 | cpp_reader *pfile; |
58fea6af | 926 | const char *space; |
82443371 | 927 | { |
58fea6af ZW |
928 | struct pragma_entry *new; |
929 | const struct pragma_entry *p = pfile->pragmas; | |
930 | size_t len = strlen (space); | |
931 | ||
932 | while (p) | |
933 | { | |
934 | if (p->isnspace && p->len == len && !memcmp (p->name, space, len)) | |
6e19bb38 ZW |
935 | /* Multiple different callers are allowed to register the same |
936 | namespace. */ | |
937 | return; | |
58fea6af ZW |
938 | p = p->next; |
939 | } | |
940 | ||
941 | new = xnew (struct pragma_entry); | |
942 | new->name = space; | |
943 | new->len = len; | |
944 | new->isnspace = 1; | |
945 | new->u.space = 0; | |
946 | ||
947 | new->next = pfile->pragmas; | |
948 | pfile->pragmas = new; | |
949 | } | |
bfb9dc7f | 950 | |
58fea6af ZW |
951 | void |
952 | _cpp_init_internal_pragmas (pfile) | |
953 | cpp_reader *pfile; | |
954 | { | |
955 | /* top level */ | |
956 | cpp_register_pragma (pfile, 0, "poison", do_pragma_poison); | |
957 | cpp_register_pragma (pfile, 0, "once", do_pragma_once); | |
958 | ||
959 | /* GCC namespace */ | |
960 | cpp_register_pragma_space (pfile, "GCC"); | |
961 | ||
962 | cpp_register_pragma (pfile, "GCC", "poison", do_pragma_poison); | |
963 | cpp_register_pragma (pfile, "GCC", "system_header", do_pragma_system_header); | |
964 | cpp_register_pragma (pfile, "GCC", "dependency", do_pragma_dependency); | |
82443371 | 965 | } |
7f2935c7 | 966 | |
711b8824 | 967 | static void |
168d3732 | 968 | do_pragma (pfile) |
7f2935c7 | 969 | cpp_reader *pfile; |
7f2935c7 | 970 | { |
58fea6af | 971 | const struct pragma_entry *p; |
93c80368 | 972 | cpp_token tok; |
58fea6af ZW |
973 | const cpp_hashnode *node; |
974 | const U_CHAR *name; | |
975 | size_t len; | |
93c80368 | 976 | int drop = 0; |
add7091b | 977 | |
58fea6af | 978 | p = pfile->pragmas; |
93c80368 NB |
979 | pfile->state.prevent_expansion++; |
980 | cpp_start_lookahead (pfile); | |
58fea6af ZW |
981 | |
982 | new_space: | |
93c80368 NB |
983 | cpp_get_token (pfile, &tok); |
984 | if (tok.type == CPP_NAME) | |
0172e2bc | 985 | { |
93c80368 NB |
986 | node = tok.val.node; |
987 | name = node->name; | |
988 | len = node->length; | |
989 | while (p) | |
58fea6af | 990 | { |
93c80368 | 991 | if (strlen (p->name) == len && !memcmp (p->name, name, len)) |
58fea6af | 992 | { |
93c80368 NB |
993 | if (p->isnspace) |
994 | { | |
995 | p = p->u.space; | |
996 | goto new_space; | |
997 | } | |
998 | else | |
999 | { | |
1000 | (*p->u.handler) (pfile); | |
1001 | drop = 1; | |
1002 | break; | |
1003 | } | |
58fea6af | 1004 | } |
93c80368 | 1005 | p = p->next; |
58fea6af | 1006 | } |
58fea6af | 1007 | } |
041c3194 | 1008 | |
93c80368 NB |
1009 | cpp_stop_lookahead (pfile, drop); |
1010 | pfile->state.prevent_expansion--; | |
1011 | ||
1012 | if (!drop && pfile->cb.def_pragma) | |
58fea6af | 1013 | (*pfile->cb.def_pragma) (pfile); |
82443371 NS |
1014 | } |
1015 | ||
58fea6af | 1016 | static void |
a2a76ce7 ZW |
1017 | do_pragma_once (pfile) |
1018 | cpp_reader *pfile; | |
1019 | { | |
1020 | cpp_buffer *ip = CPP_BUFFER (pfile); | |
1021 | ||
317639a8 BC |
1022 | cpp_warning (pfile, "#pragma once is obsolete"); |
1023 | ||
38b24ee2 | 1024 | if (CPP_PREV_BUFFER (ip) == NULL) |
93c80368 | 1025 | cpp_warning (pfile, "#pragma once in main file"); |
a2a76ce7 | 1026 | else |
c31a6508 | 1027 | ip->inc->cmacro = NEVER_REREAD; |
93c80368 NB |
1028 | |
1029 | check_eol (pfile); | |
a2a76ce7 | 1030 | } |
fc009f96 | 1031 | |
58fea6af | 1032 | static void |
a2a76ce7 ZW |
1033 | do_pragma_poison (pfile) |
1034 | cpp_reader *pfile; | |
1035 | { | |
1036 | /* Poison these symbols so that all subsequent usage produces an | |
1037 | error message. */ | |
93c80368 | 1038 | cpp_token tok; |
f8f769ea | 1039 | cpp_hashnode *hp; |
a2a76ce7 | 1040 | |
93c80368 | 1041 | pfile->state.poisoned_ok = 1; |
a2a76ce7 ZW |
1042 | for (;;) |
1043 | { | |
93c80368 NB |
1044 | _cpp_lex_token (pfile, &tok); |
1045 | if (tok.type == CPP_EOF) | |
a2a76ce7 | 1046 | break; |
93c80368 | 1047 | if (tok.type != CPP_NAME) |
fc009f96 | 1048 | { |
93c80368 NB |
1049 | cpp_error (pfile, "invalid #pragma GCC poison directive"); |
1050 | break; | |
fc009f96 GK |
1051 | } |
1052 | ||
93c80368 NB |
1053 | hp = tok.val.node; |
1054 | if (hp->flags & NODE_POISONED) | |
1055 | continue; | |
1056 | ||
1057 | if (hp->type == NT_MACRO) | |
1058 | cpp_warning (pfile, "poisoning existing macro \"%s\"", hp->name); | |
1059 | _cpp_free_definition (hp); | |
1060 | hp->flags |= NODE_POISONED | NODE_DIAGNOSTIC; | |
fc009f96 | 1061 | } |
93c80368 | 1062 | pfile->state.poisoned_ok = 0; |
58fea6af | 1063 | |
93c80368 NB |
1064 | #if 0 /* Doesn't quite work yet. */ |
1065 | if (tok.type == CPP_EOF && pfile->cb.poison) | |
58fea6af | 1066 | (*pfile->cb.poison) (pfile); |
93c80368 | 1067 | #endif |
7f2935c7 | 1068 | } |
2c0b35cb ZW |
1069 | |
1070 | /* Mark the current header as a system header. This will suppress | |
1071 | some categories of warnings (notably those from -pedantic). It is | |
1072 | intended for use in system libraries that cannot be implemented in | |
1073 | conforming C, but cannot be certain that their headers appear in a | |
1074 | system include directory. To prevent abuse, it is rejected in the | |
1075 | primary source file. */ | |
58fea6af | 1076 | static void |
2c0b35cb ZW |
1077 | do_pragma_system_header (pfile) |
1078 | cpp_reader *pfile; | |
1079 | { | |
041c3194 | 1080 | cpp_buffer *ip = CPP_BUFFER (pfile); |
2c0b35cb ZW |
1081 | if (CPP_PREV_BUFFER (ip) == NULL) |
1082 | cpp_warning (pfile, "#pragma system_header outside include file"); | |
1083 | else | |
e605b040 | 1084 | cpp_make_system_header (pfile, ip, 1); |
93c80368 NB |
1085 | |
1086 | check_eol (pfile); | |
2c0b35cb | 1087 | } |
f3f751ad NS |
1088 | |
1089 | /* Check the modified date of the current include file against a specified | |
1090 | file. Issue a diagnostic, if the specified file is newer. We use this to | |
1091 | determine if a fixed header should be refixed. */ | |
58fea6af | 1092 | static void |
f3f751ad NS |
1093 | do_pragma_dependency (pfile) |
1094 | cpp_reader *pfile; | |
1095 | { | |
93c80368 NB |
1096 | cpp_token header, msg; |
1097 | int ordering; | |
041c3194 | 1098 | |
93c80368 | 1099 | if (parse_include (pfile, &header)) |
58fea6af | 1100 | return; |
041c3194 | 1101 | |
93c80368 | 1102 | ordering = _cpp_compare_file_date (pfile, &header); |
f3f751ad | 1103 | if (ordering < 0) |
93c80368 NB |
1104 | cpp_warning (pfile, "cannot find source %s", |
1105 | cpp_token_as_text (pfile, &header)); | |
f3f751ad NS |
1106 | else if (ordering > 0) |
1107 | { | |
93c80368 NB |
1108 | cpp_warning (pfile, "current file is older than %s", |
1109 | cpp_token_as_text (pfile, &header)); | |
1110 | cpp_start_lookahead (pfile); | |
1111 | cpp_get_token (pfile, &msg); | |
1112 | cpp_stop_lookahead (pfile, msg.type == CPP_EOF); | |
29b10746 NB |
1113 | if (msg.type != CPP_EOF) |
1114 | do_diagnostic (pfile, WARNING, 0); | |
f3f751ad | 1115 | } |
f3f751ad NS |
1116 | } |
1117 | ||
a5c3cccd NB |
1118 | /* Check syntax is "(string-literal)". Returns 0 on success. */ |
1119 | static int | |
1120 | get__Pragma_string (pfile, string) | |
1121 | cpp_reader *pfile; | |
1122 | cpp_token *string; | |
1123 | { | |
1124 | cpp_token paren; | |
1125 | ||
1126 | cpp_get_token (pfile, &paren); | |
1127 | if (paren.type != CPP_OPEN_PAREN) | |
1128 | return 1; | |
1129 | ||
1130 | cpp_get_token (pfile, string); | |
1131 | if (string->type != CPP_STRING && string->type != CPP_WSTRING) | |
1132 | return 1; | |
1133 | ||
1134 | cpp_get_token (pfile, &paren); | |
1135 | return paren.type != CPP_CLOSE_PAREN; | |
1136 | } | |
1137 | ||
1138 | /* Returns a malloced buffer containing a destringized cpp_string by | |
1139 | removing the first \ of \" and \\ sequences. */ | |
1140 | static unsigned char * | |
1141 | destringize (in, len) | |
1142 | const cpp_string *in; | |
1143 | unsigned int *len; | |
1144 | { | |
1145 | const unsigned char *src, *limit; | |
1146 | unsigned char *dest, *result; | |
1147 | ||
1148 | dest = result = (unsigned char *) xmalloc (in->len); | |
1149 | for (src = in->text, limit = src + in->len; src < limit;) | |
1150 | { | |
1151 | /* We know there is a character following the backslash. */ | |
1152 | if (*src == '\\' && (src[1] == '\\' || src[1] == '"')) | |
1153 | src++; | |
1154 | *dest++ = *src++; | |
1155 | } | |
1156 | ||
1157 | *len = dest - result; | |
1158 | return result; | |
1159 | } | |
1160 | ||
1161 | void | |
1162 | _cpp_do__Pragma (pfile) | |
1163 | cpp_reader *pfile; | |
1164 | { | |
1165 | cpp_token string; | |
1166 | unsigned char *buffer; | |
1167 | unsigned int len; | |
1168 | ||
1169 | if (get__Pragma_string (pfile, &string)) | |
1170 | { | |
1171 | cpp_error (pfile, "_Pragma takes a parenthesized string literal"); | |
1172 | return; | |
1173 | } | |
1174 | ||
1175 | buffer = destringize (&string.val.str, &len); | |
1176 | run_directive (pfile, T_PRAGMA, (char *) buffer, len, _("<_Pragma>")); | |
1177 | free ((PTR) buffer); | |
1178 | } | |
1179 | ||
7f2935c7 | 1180 | /* Just ignore #sccs, on systems where we define it at all. */ |
07aa0b04 | 1181 | #ifdef SCCS_DIRECTIVE |
711b8824 | 1182 | static void |
168d3732 | 1183 | do_sccs (pfile) |
041c3194 | 1184 | cpp_reader *pfile ATTRIBUTE_UNUSED; |
7f2935c7 | 1185 | { |
7f2935c7 | 1186 | } |
07aa0b04 | 1187 | #endif |
1d0e51ba | 1188 | |
711b8824 | 1189 | static void |
168d3732 ZW |
1190 | do_ifdef (pfile) |
1191 | cpp_reader *pfile; | |
1192 | { | |
93c80368 | 1193 | int skip = 1; |
041c3194 | 1194 | |
b528a07e | 1195 | if (! pfile->buffer->was_skipping) |
93c80368 NB |
1196 | { |
1197 | const cpp_hashnode *node = lex_macro_node (pfile); | |
041c3194 | 1198 | |
93c80368 NB |
1199 | if (node) |
1200 | skip = node->type != NT_MACRO; | |
1201 | } | |
168d3732 | 1202 | |
93c80368 NB |
1203 | push_conditional (pfile, skip, T_IFDEF, 0); |
1204 | } | |
168d3732 | 1205 | |
711b8824 | 1206 | static void |
168d3732 ZW |
1207 | do_ifndef (pfile) |
1208 | cpp_reader *pfile; | |
1209 | { | |
93c80368 | 1210 | int skip = 1; |
bfb9dc7f | 1211 | const cpp_hashnode *node = 0; |
168d3732 | 1212 | |
b528a07e | 1213 | if (! pfile->buffer->was_skipping) |
5af7e2c2 | 1214 | { |
93c80368 NB |
1215 | node = lex_macro_node (pfile); |
1216 | if (node) | |
1217 | skip = node->type == NT_MACRO; | |
5af7e2c2 | 1218 | } |
041c3194 | 1219 | |
93c80368 | 1220 | push_conditional (pfile, skip, T_IFNDEF, node); |
7f2935c7 PB |
1221 | } |
1222 | ||
93c80368 NB |
1223 | /* #if cooperates with parse_defined to handle multiple-include |
1224 | optimisations. If macro expansions or identifiers appear in the | |
1225 | expression, we cannot treat it as a controlling conditional, since | |
1226 | their values could change in the future. */ | |
7f2935c7 | 1227 | |
711b8824 | 1228 | static void |
ea4a453b | 1229 | do_if (pfile) |
7f2935c7 | 1230 | cpp_reader *pfile; |
7f2935c7 | 1231 | { |
93c80368 | 1232 | int skip = 1; |
ea4a453b | 1233 | const cpp_hashnode *cmacro = 0; |
7f2935c7 | 1234 | |
b528a07e | 1235 | if (! pfile->buffer->was_skipping) |
ea4a453b | 1236 | { |
93c80368 NB |
1237 | /* Controlling macro of #if ! defined () */ |
1238 | pfile->mi_ind_cmacro = 0; | |
1239 | skip = _cpp_parse_expr (pfile) == 0; | |
1240 | cmacro = pfile->mi_ind_cmacro; | |
ea4a453b | 1241 | } |
93c80368 NB |
1242 | |
1243 | push_conditional (pfile, skip, T_IF, cmacro); | |
7f2935c7 PB |
1244 | } |
1245 | ||
b528a07e | 1246 | /* Flip skipping state if appropriate and continue without changing |
ea4a453b ZW |
1247 | if_stack; this is so that the error message for missing #endif's |
1248 | etc. will point to the original #if. */ | |
ed705a82 | 1249 | |
711b8824 | 1250 | static void |
ea4a453b ZW |
1251 | do_else (pfile) |
1252 | cpp_reader *pfile; | |
ed705a82 | 1253 | { |
b528a07e NB |
1254 | cpp_buffer *buffer = pfile->buffer; |
1255 | struct if_stack *ifs = buffer->if_stack; | |
ff2b53ef | 1256 | |
ea4a453b | 1257 | if (ifs == NULL) |
93c80368 NB |
1258 | cpp_error (pfile, "#else without #if"); |
1259 | else | |
ff2b53ef | 1260 | { |
93c80368 NB |
1261 | if (ifs->type == T_ELSE) |
1262 | { | |
1263 | cpp_error (pfile, "#else after #else"); | |
1264 | cpp_error_with_line (pfile, ifs->pos.line, ifs->pos.col, | |
1265 | "the conditional began here"); | |
1266 | } | |
b528a07e NB |
1267 | ifs->type = T_ELSE; |
1268 | ||
1269 | /* Buffer->was_skipping is 1 if all conditionals in this chain | |
1270 | have been false, 2 if a conditional has been true. */ | |
1271 | if (! ifs->was_skipping && buffer->was_skipping != 2) | |
1272 | buffer->was_skipping = ! buffer->was_skipping; | |
7f2935c7 | 1273 | |
93c80368 NB |
1274 | /* Invalidate any controlling macro. */ |
1275 | ifs->mi_cmacro = 0; | |
ff2b53ef | 1276 | } |
93c80368 NB |
1277 | |
1278 | check_eol (pfile); | |
7f2935c7 PB |
1279 | } |
1280 | ||
93c80368 NB |
1281 | /* handle a #elif directive by not changing if_stack either. see the |
1282 | comment above do_else. */ | |
7f2935c7 | 1283 | |
711b8824 | 1284 | static void |
ea4a453b | 1285 | do_elif (pfile) |
7f2935c7 | 1286 | cpp_reader *pfile; |
7f2935c7 | 1287 | { |
b528a07e NB |
1288 | cpp_buffer *buffer = pfile->buffer; |
1289 | struct if_stack *ifs = buffer->if_stack; | |
7f2935c7 | 1290 | |
ea4a453b | 1291 | if (ifs == NULL) |
b528a07e NB |
1292 | cpp_error (pfile, "#elif without #if"); |
1293 | else | |
40ea76de | 1294 | { |
b528a07e NB |
1295 | if (ifs->type == T_ELSE) |
1296 | { | |
1297 | cpp_error (pfile, "#elif after #else"); | |
1298 | cpp_error_with_line (pfile, ifs->pos.line, ifs->pos.col, | |
1299 | "the conditional began here"); | |
1300 | } | |
1301 | ifs->type = T_ELIF; | |
93c80368 | 1302 | |
b528a07e NB |
1303 | /* Don't evaluate #elif if our higher level is skipping. */ |
1304 | if (! ifs->was_skipping) | |
1305 | { | |
1306 | /* Buffer->was_skipping is 1 if all conditionals in this | |
1307 | chain have been false, 2 if a conditional has been true. */ | |
1308 | if (buffer->was_skipping == 1) | |
1309 | buffer->was_skipping = ! _cpp_parse_expr (pfile); | |
1310 | else | |
1311 | buffer->was_skipping = 2; | |
041c3194 | 1312 | |
b528a07e NB |
1313 | /* Invalidate any controlling macro. */ |
1314 | ifs->mi_cmacro = 0; | |
1315 | } | |
40ea76de | 1316 | } |
7f2935c7 PB |
1317 | } |
1318 | ||
ea4a453b | 1319 | /* #endif pops the if stack and resets pfile->skipping. */ |
7f2935c7 | 1320 | |
711b8824 | 1321 | static void |
168d3732 | 1322 | do_endif (pfile) |
7f2935c7 | 1323 | cpp_reader *pfile; |
7f2935c7 | 1324 | { |
b528a07e NB |
1325 | cpp_buffer *buffer = pfile->buffer; |
1326 | struct if_stack *ifs = buffer->if_stack; | |
ea4a453b | 1327 | |
ea4a453b ZW |
1328 | if (ifs == NULL) |
1329 | cpp_error (pfile, "#endif without #if"); | |
7f2935c7 PB |
1330 | else |
1331 | { | |
93c80368 NB |
1332 | /* If potential control macro, we go back outside again. */ |
1333 | if (ifs->next == 0 && ifs->mi_cmacro) | |
1334 | { | |
1335 | pfile->mi_state = MI_OUTSIDE; | |
1336 | pfile->mi_cmacro = ifs->mi_cmacro; | |
1337 | } | |
1338 | ||
b528a07e NB |
1339 | buffer->if_stack = ifs->next; |
1340 | buffer->was_skipping = ifs->was_skipping; | |
c71f835b | 1341 | obstack_free (pfile->buffer_ob, ifs); |
7f2935c7 | 1342 | } |
7f2935c7 | 1343 | |
93c80368 NB |
1344 | check_eol (pfile); |
1345 | } | |
041c3194 | 1346 | |
ea4a453b ZW |
1347 | /* Push an if_stack entry and set pfile->skipping accordingly. |
1348 | If this is a #ifndef starting at the beginning of a file, | |
1349 | CMACRO is the macro name tested by the #ifndef. */ | |
1350 | ||
1351 | static void | |
1352 | push_conditional (pfile, skip, type, cmacro) | |
1353 | cpp_reader *pfile; | |
1354 | int skip; | |
1355 | int type; | |
1356 | const cpp_hashnode *cmacro; | |
1357 | { | |
1358 | struct if_stack *ifs; | |
b528a07e | 1359 | cpp_buffer *buffer = pfile->buffer; |
ea4a453b | 1360 | |
c71f835b | 1361 | ifs = xobnew (pfile->buffer_ob, struct if_stack); |
93c80368 | 1362 | ifs->pos = pfile->directive_pos; |
b528a07e NB |
1363 | ifs->next = buffer->if_stack; |
1364 | ifs->was_skipping = buffer->was_skipping; | |
ea4a453b | 1365 | ifs->type = type; |
93c80368 NB |
1366 | if (pfile->mi_state == MI_OUTSIDE && pfile->mi_cmacro == 0) |
1367 | ifs->mi_cmacro = cmacro; | |
1368 | else | |
1369 | ifs->mi_cmacro = 0; | |
ea4a453b | 1370 | |
b528a07e NB |
1371 | buffer->was_skipping = skip; |
1372 | buffer->if_stack = ifs; | |
782331f4 | 1373 | } |
7061aa5a | 1374 | |
93c80368 NB |
1375 | /* Read the tokens of the answer into the macro pool. Only commit the |
1376 | memory if we intend it as permanent storage, i.e. the #assert case. | |
1377 | Returns 0 on success. */ | |
1378 | ||
1379 | static int | |
1380 | parse_answer (pfile, answerp, type) | |
7f2935c7 | 1381 | cpp_reader *pfile; |
041c3194 | 1382 | struct answer **answerp; |
93c80368 | 1383 | int type; |
7f2935c7 | 1384 | { |
93c80368 NB |
1385 | cpp_token paren, *token; |
1386 | struct answer *answer; | |
1387 | ||
1388 | if (POOL_FRONT (&pfile->macro_pool) + sizeof (struct answer) > | |
1389 | POOL_LIMIT (&pfile->macro_pool)) | |
1390 | _cpp_next_chunk (&pfile->macro_pool, sizeof (struct answer), 0); | |
1391 | answer = (struct answer *) POOL_FRONT (&pfile->macro_pool); | |
1392 | answer->count = 0; | |
1393 | ||
1394 | /* In a conditional, it is legal to not have an open paren. We | |
1395 | should save the following token in this case. */ | |
1396 | if (type == T_IF) | |
1397 | cpp_start_lookahead (pfile); | |
1398 | cpp_get_token (pfile, &paren); | |
1399 | if (type == T_IF) | |
1400 | cpp_stop_lookahead (pfile, paren.type == CPP_OPEN_PAREN); | |
1401 | ||
1402 | /* If not a paren, see if we're OK. */ | |
1403 | if (paren.type != CPP_OPEN_PAREN) | |
041c3194 | 1404 | { |
93c80368 NB |
1405 | /* In a conditional no answer is a test for any answer. It |
1406 | could be followed by any token. */ | |
1407 | if (type == T_IF) | |
1408 | return 0; | |
1409 | ||
1410 | /* #unassert with no answer is valid - it removes all answers. */ | |
1411 | if (type == T_UNASSERT && paren.type == CPP_EOF) | |
1412 | return 0; | |
15dad1d9 | 1413 | |
041c3194 | 1414 | cpp_error (pfile, "missing '(' after predicate"); |
93c80368 | 1415 | return 1; |
041c3194 | 1416 | } |
7061aa5a | 1417 | |
041c3194 ZW |
1418 | for (;;) |
1419 | { | |
93c80368 NB |
1420 | token = &answer->first[answer->count]; |
1421 | /* Check we have room for the token. */ | |
1422 | if ((unsigned char *) (token + 1) >= POOL_LIMIT (&pfile->macro_pool)) | |
041c3194 | 1423 | { |
93c80368 NB |
1424 | _cpp_next_chunk (&pfile->macro_pool, sizeof (cpp_token), |
1425 | (unsigned char **) &answer); | |
1426 | token = &answer->first[answer->count]; | |
041c3194 | 1427 | } |
93c80368 | 1428 | |
7f2f1a66 | 1429 | cpp_get_token (pfile, token); |
041c3194 ZW |
1430 | if (token->type == CPP_CLOSE_PAREN) |
1431 | break; | |
a7abcbbf | 1432 | |
93c80368 | 1433 | if (token->type == CPP_EOF) |
041c3194 | 1434 | { |
93c80368 NB |
1435 | cpp_error (pfile, "missing ')' to complete answer"); |
1436 | return 1; | |
041c3194 | 1437 | } |
93c80368 | 1438 | answer->count++; |
041c3194 | 1439 | } |
15dad1d9 | 1440 | |
93c80368 | 1441 | if (answer->count == 0) |
7061aa5a | 1442 | { |
041c3194 | 1443 | cpp_error (pfile, "predicate's answer is empty"); |
93c80368 | 1444 | return 1; |
7f2935c7 | 1445 | } |
041c3194 ZW |
1446 | |
1447 | /* Drop whitespace at start. */ | |
93c80368 NB |
1448 | answer->first->flags &= ~PREV_WHITE; |
1449 | *answerp = answer; | |
041c3194 | 1450 | |
93c80368 NB |
1451 | if (type == T_ASSERT || type == T_UNASSERT) |
1452 | check_eol (pfile); | |
1453 | return 0; | |
1454 | } | |
041c3194 | 1455 | |
93c80368 NB |
1456 | /* Parses an assertion, returning a pointer to the hash node of the |
1457 | predicate, or 0 on error. If an answer was supplied, it is placed | |
7f2f1a66 | 1458 | in ANSWERP, otherwise it is set to 0. */ |
93c80368 NB |
1459 | static cpp_hashnode * |
1460 | parse_assertion (pfile, answerp, type) | |
1461 | cpp_reader *pfile; | |
1462 | struct answer **answerp; | |
1463 | int type; | |
1464 | { | |
1465 | cpp_hashnode *result = 0; | |
1466 | cpp_token predicate; | |
1467 | ||
1468 | /* We don't expand predicates or answers. */ | |
1469 | pfile->state.prevent_expansion++; | |
1470 | ||
1471 | /* Use the permanent pool for storage (for the answers). */ | |
1472 | pfile->string_pool = &pfile->ident_pool; | |
1473 | ||
1474 | *answerp = 0; | |
7f2f1a66 | 1475 | cpp_get_token (pfile, &predicate); |
93c80368 NB |
1476 | if (predicate.type == CPP_EOF) |
1477 | cpp_error (pfile, "assertion without predicate"); | |
1478 | else if (predicate.type != CPP_NAME) | |
1479 | cpp_error (pfile, "predicate must be an identifier"); | |
1480 | else if (parse_answer (pfile, answerp, type) == 0) | |
1481 | { | |
1482 | unsigned int len = predicate.val.node->length; | |
1483 | unsigned char *sym = alloca (len + 1); | |
041c3194 | 1484 | |
93c80368 NB |
1485 | /* Prefix '#' to get it out of macro namespace. */ |
1486 | sym[0] = '#'; | |
1487 | memcpy (sym + 1, predicate.val.node->name, len); | |
1488 | result = cpp_lookup (pfile, sym, len + 1); | |
1489 | } | |
7061aa5a | 1490 | |
93c80368 NB |
1491 | pfile->string_pool = &pfile->temp_string_pool; |
1492 | pfile->state.prevent_expansion--; | |
1493 | return result; | |
7f2935c7 | 1494 | } |
7061aa5a | 1495 | |
041c3194 ZW |
1496 | /* Returns a pointer to the pointer to the answer in the answer chain, |
1497 | or a pointer to NULL if the answer is not in the chain. */ | |
93c80368 NB |
1498 | static struct answer ** |
1499 | find_answer (node, candidate) | |
041c3194 | 1500 | cpp_hashnode *node; |
93c80368 | 1501 | const struct answer *candidate; |
7f2935c7 | 1502 | { |
93c80368 | 1503 | unsigned int i; |
041c3194 | 1504 | struct answer **result; |
7f2935c7 | 1505 | |
041c3194 | 1506 | for (result = &node->value.answers; *result; result = &(*result)->next) |
93c80368 NB |
1507 | { |
1508 | struct answer *answer = *result; | |
1509 | ||
1510 | if (answer->count == candidate->count) | |
1511 | { | |
1512 | for (i = 0; i < answer->count; i++) | |
1513 | if (! _cpp_equiv_tokens (&answer->first[i], &candidate->first[i])) | |
1514 | break; | |
1515 | ||
1516 | if (i == answer->count) | |
1517 | break; | |
1518 | } | |
1519 | } | |
ff2b53ef | 1520 | |
041c3194 ZW |
1521 | return result; |
1522 | } | |
15dad1d9 | 1523 | |
93c80368 NB |
1524 | /* Test an assertion within a preprocessor conditional. Returns |
1525 | non-zero on failure, zero on success. On success, the result of | |
1526 | the test is written into VALUE. */ | |
1527 | int | |
1528 | _cpp_test_assertion (pfile, value) | |
1529 | cpp_reader *pfile; | |
1530 | int *value; | |
1531 | { | |
1532 | struct answer *answer; | |
1533 | cpp_hashnode *node; | |
1534 | ||
1535 | node = parse_assertion (pfile, &answer, T_IF); | |
1536 | if (node) | |
1537 | *value = (node->type == NT_ASSERTION && | |
1538 | (answer == 0 || *find_answer (node, answer) != 0)); | |
1539 | ||
1540 | /* We don't commit the memory for the answer - it's temporary only. */ | |
1541 | return node == 0; | |
1542 | } | |
1543 | ||
711b8824 | 1544 | static void |
041c3194 ZW |
1545 | do_assert (pfile) |
1546 | cpp_reader *pfile; | |
1547 | { | |
1548 | struct answer *new_answer; | |
1549 | cpp_hashnode *node; | |
1550 | ||
93c80368 | 1551 | node = parse_assertion (pfile, &new_answer, T_ASSERT); |
041c3194 | 1552 | if (node) |
ff2b53ef | 1553 | { |
93c80368 NB |
1554 | /* Place the new answer in the answer list. First check there |
1555 | is not a duplicate. */ | |
041c3194 | 1556 | new_answer->next = 0; |
93c80368 | 1557 | if (node->type == NT_ASSERTION) |
041c3194 | 1558 | { |
93c80368 NB |
1559 | if (*find_answer (node, new_answer)) |
1560 | { | |
1561 | cpp_warning (pfile, "\"%s\" re-asserted", node->name + 1); | |
1562 | return; | |
1563 | } | |
041c3194 ZW |
1564 | new_answer->next = node->value.answers; |
1565 | } | |
93c80368 | 1566 | node->type = NT_ASSERTION; |
041c3194 | 1567 | node->value.answers = new_answer; |
93c80368 NB |
1568 | POOL_COMMIT (&pfile->macro_pool, (sizeof (struct answer) |
1569 | + (new_answer->count - 1) | |
1570 | * sizeof (cpp_token))); | |
ff2b53ef | 1571 | } |
041c3194 | 1572 | } |
15dad1d9 | 1573 | |
711b8824 | 1574 | static void |
041c3194 ZW |
1575 | do_unassert (pfile) |
1576 | cpp_reader *pfile; | |
1577 | { | |
1578 | cpp_hashnode *node; | |
93c80368 | 1579 | struct answer *answer; |
041c3194 | 1580 | |
93c80368 NB |
1581 | node = parse_assertion (pfile, &answer, T_UNASSERT); |
1582 | /* It isn't an error to #unassert something that isn't asserted. */ | |
1583 | if (node && node->type == NT_ASSERTION) | |
7061aa5a | 1584 | { |
93c80368 | 1585 | if (answer) |
15dad1d9 | 1586 | { |
93c80368 | 1587 | struct answer **p = find_answer (node, answer), *temp; |
041c3194 | 1588 | |
93c80368 NB |
1589 | /* Remove the answer from the list. */ |
1590 | temp = *p; | |
1591 | if (temp) | |
1592 | *p = temp->next; | |
a7abcbbf | 1593 | |
93c80368 NB |
1594 | /* Did we free the last answer? */ |
1595 | if (node->value.answers == 0) | |
1596 | node->type = NT_VOID; | |
1597 | } | |
1598 | else | |
1599 | _cpp_free_definition (node); | |
041c3194 | 1600 | } |
93c80368 NB |
1601 | |
1602 | /* We don't commit the memory for the answer - it's temporary only. */ | |
7f2935c7 | 1603 | } |
7f2935c7 | 1604 | |
45b966db ZW |
1605 | /* These are for -D, -U, -A. */ |
1606 | ||
1607 | /* Process the string STR as if it appeared as the body of a #define. | |
1608 | If STR is just an identifier, define it with value 1. | |
1609 | If STR has anything after the identifier, then it should | |
1610 | be identifier=definition. */ | |
1611 | ||
0b22d65c | 1612 | void |
45b966db | 1613 | cpp_define (pfile, str) |
0b22d65c | 1614 | cpp_reader *pfile; |
7ceb3598 | 1615 | const char *str; |
0b22d65c | 1616 | { |
45b966db ZW |
1617 | char *buf, *p; |
1618 | size_t count; | |
1619 | ||
45b966db ZW |
1620 | /* Copy the entire option so we can modify it. |
1621 | Change the first "=" in the string to a space. If there is none, | |
86368122 NB |
1622 | tack " 1" on the end. */ |
1623 | ||
1624 | /* Length including the null. */ | |
1625 | count = strlen (str); | |
1626 | buf = (char *) alloca (count + 2); | |
1627 | memcpy (buf, str, count); | |
1628 | ||
1629 | p = strchr (str, '='); | |
45b966db | 1630 | if (p) |
86368122 | 1631 | buf[p - str] = ' '; |
45b966db ZW |
1632 | else |
1633 | { | |
86368122 NB |
1634 | buf[count++] = ' '; |
1635 | buf[count++] = '1'; | |
0b22d65c | 1636 | } |
cf4ed945 | 1637 | |
86368122 | 1638 | run_directive (pfile, T_DEFINE, buf, count, 0); |
2c8f0515 ZW |
1639 | } |
1640 | ||
1641 | /* Slight variant of the above for use by initialize_builtins, which (a) | |
1642 | knows how to set up the buffer itself, (b) needs a different "filename" | |
1643 | tag. */ | |
1644 | void | |
1645 | _cpp_define_builtin (pfile, str) | |
1646 | cpp_reader *pfile; | |
1647 | const char *str; | |
1648 | { | |
93c80368 | 1649 | run_directive (pfile, T_DEFINE, str, strlen (str), _("<builtin>")); |
45b966db | 1650 | } |
0f41302f | 1651 | |
45b966db ZW |
1652 | /* Process MACRO as if it appeared as the body of an #undef. */ |
1653 | void | |
1654 | cpp_undef (pfile, macro) | |
7f2935c7 | 1655 | cpp_reader *pfile; |
45b966db | 1656 | const char *macro; |
7f2935c7 | 1657 | { |
93c80368 | 1658 | run_directive (pfile, T_UNDEF, macro, strlen (macro), 0); |
7f2935c7 PB |
1659 | } |
1660 | ||
45b966db ZW |
1661 | /* Process the string STR as if it appeared as the body of a #assert. */ |
1662 | void | |
1663 | cpp_assert (pfile, str) | |
1664 | cpp_reader *pfile; | |
1665 | const char *str; | |
1666 | { | |
86368122 | 1667 | handle_assertion (pfile, str, T_ASSERT); |
45b966db | 1668 | } |
7f2935c7 | 1669 | |
45b966db ZW |
1670 | /* Process STR as if it appeared as the body of an #unassert. */ |
1671 | void | |
1672 | cpp_unassert (pfile, str) | |
7f2935c7 | 1673 | cpp_reader *pfile; |
45b966db | 1674 | const char *str; |
7f2935c7 | 1675 | { |
86368122 | 1676 | handle_assertion (pfile, str, T_UNASSERT); |
45b966db | 1677 | } |
3fdc651f | 1678 | |
86368122 NB |
1679 | /* Common code for cpp_assert (-A) and cpp_unassert (-A-). */ |
1680 | static void | |
1681 | handle_assertion (pfile, str, type) | |
1682 | cpp_reader *pfile; | |
1683 | const char *str; | |
1684 | int type; | |
1685 | { | |
1686 | size_t count = strlen (str); | |
1687 | const char *p = strchr (str, '='); | |
1688 | ||
1689 | if (p) | |
1690 | { | |
1691 | /* Copy the entire option so we can modify it. Change the first | |
1692 | "=" in the string to a '(', and tack a ')' on the end. */ | |
1693 | char *buf = (char *) alloca (count + 1); | |
1694 | ||
1695 | memcpy (buf, str, count); | |
1696 | buf[p - str] = '('; | |
1697 | buf[count++] = ')'; | |
1698 | str = buf; | |
1699 | } | |
1700 | ||
1701 | run_directive (pfile, type, str, count, 0); | |
1702 | } | |
1703 | ||
93c80368 NB |
1704 | /* Allocate a new cpp_buffer for PFILE, and push it on the input |
1705 | buffer stack. If BUFFER != NULL, then use the LENGTH characters in | |
1706 | BUFFER as the new input buffer. Return the new buffer, or NULL on | |
1707 | failure. */ | |
c71f835b ZW |
1708 | |
1709 | cpp_buffer * | |
1710 | cpp_push_buffer (pfile, buffer, length) | |
1711 | cpp_reader *pfile; | |
1712 | const U_CHAR *buffer; | |
1713 | long length; | |
1714 | { | |
1715 | cpp_buffer *buf = CPP_BUFFER (pfile); | |
1716 | cpp_buffer *new; | |
1717 | if (++pfile->buffer_stack_depth == CPP_STACK_MAX) | |
1718 | { | |
d8090680 | 1719 | cpp_fatal (pfile, "#include nested too deeply"); |
c71f835b ZW |
1720 | return NULL; |
1721 | } | |
93c80368 | 1722 | |
c71f835b | 1723 | new = xobnew (pfile->buffer_ob, cpp_buffer); |
93c80368 | 1724 | /* Clears, amongst other things, if_stack and mi_cmacro. */ |
c71f835b ZW |
1725 | memset (new, 0, sizeof (cpp_buffer)); |
1726 | ||
93c80368 | 1727 | pfile->lexer_pos.output_line = 1; |
f9a0e96c | 1728 | new->line_base = new->buf = new->cur = buffer; |
c71f835b ZW |
1729 | new->rlimit = buffer + length; |
1730 | new->prev = buf; | |
0d9f234d | 1731 | new->pfile = pfile; |
a5c3cccd NB |
1732 | /* Preprocessed files don't do trigraph and escaped newline processing. */ |
1733 | new->from_stage3 = CPP_OPTION (pfile, preprocessed); | |
cbcff6df | 1734 | /* No read ahead or extra char initially. */ |
0d9f234d | 1735 | new->read_ahead = EOF; |
cbcff6df | 1736 | new->extra_char = EOF; |
4c2b647d | 1737 | pfile->state.next_bol = 1; |
c71f835b ZW |
1738 | |
1739 | CPP_BUFFER (pfile) = new; | |
1740 | return new; | |
1741 | } | |
1742 | ||
1743 | cpp_buffer * | |
1744 | cpp_pop_buffer (pfile) | |
1745 | cpp_reader *pfile; | |
1746 | { | |
b528a07e NB |
1747 | cpp_buffer *buffer = pfile->buffer; |
1748 | struct if_stack *ifs = buffer->if_stack; | |
58fea6af | 1749 | int wfb; |
c71f835b | 1750 | |
b528a07e NB |
1751 | /* Walk back up the conditional stack till we reach its level at |
1752 | entry to this file, issuing error messages. */ | |
1753 | for (ifs = buffer->if_stack; ifs; ifs = ifs->next) | |
1754 | cpp_error_with_line (pfile, ifs->pos.line, ifs->pos.col, | |
1755 | "unterminated #%s", dtable[ifs->type].name); | |
1756 | ||
1757 | wfb = (buffer->inc != 0); | |
58fea6af | 1758 | if (wfb) |
b528a07e | 1759 | _cpp_pop_file_buffer (pfile, buffer); |
c71f835b | 1760 | |
b528a07e NB |
1761 | pfile->buffer = buffer->prev; |
1762 | obstack_free (pfile->buffer_ob, buffer); | |
c71f835b | 1763 | pfile->buffer_stack_depth--; |
58fea6af | 1764 | |
b528a07e | 1765 | if (pfile->buffer && wfb && pfile->cb.leave_file) |
58fea6af ZW |
1766 | (*pfile->cb.leave_file) (pfile); |
1767 | ||
b528a07e | 1768 | return pfile->buffer; |
c71f835b ZW |
1769 | } |
1770 | ||
1771 | #define obstack_chunk_alloc xmalloc | |
1772 | #define obstack_chunk_free free | |
1773 | void | |
1774 | _cpp_init_stacks (pfile) | |
1775 | cpp_reader *pfile; | |
1776 | { | |
bfb9dc7f | 1777 | int i; |
93c80368 | 1778 | cpp_hashnode *node; |
bfb9dc7f | 1779 | |
c71f835b ZW |
1780 | pfile->buffer_ob = xnew (struct obstack); |
1781 | obstack_init (pfile->buffer_ob); | |
bfb9dc7f | 1782 | |
93c80368 NB |
1783 | /* Register the directives. */ |
1784 | for (i = 1; i < N_DIRECTIVES; i++) | |
1785 | { | |
1786 | node = cpp_lookup (pfile, dtable[i - 1].name, dtable[i - 1].length); | |
1787 | node->directive_index = i; | |
1788 | } | |
c71f835b ZW |
1789 | } |
1790 | ||
1791 | void | |
1792 | _cpp_cleanup_stacks (pfile) | |
1793 | cpp_reader *pfile; | |
1794 | { | |
1795 | obstack_free (pfile->buffer_ob, 0); | |
1796 | free (pfile->buffer_ob); | |
1797 | } |