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a949941c | 1 | /* CPP Library. (Directive handling.) |
5e7b4e25 | 2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
23345bbb | 3 | 1999, 2000, 2001, 2002, 2003 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" |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
7f2935c7 | 26 | |
956d6950 JL |
27 | #include "cpplib.h" |
28 | #include "cpphash.h" | |
c71f835b | 29 | #include "obstack.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). */ | |
88ae23e7 ZW |
41 | struct if_stack |
42 | { | |
43 | struct if_stack *next; | |
50410426 | 44 | unsigned int line; /* Line where condition started. */ |
93c80368 | 45 | const cpp_hashnode *mi_cmacro;/* macro name for #ifndef around entire file */ |
cef0d199 NB |
46 | bool skip_elses; /* Can future #else / #elif be skipped? */ |
47 | bool was_skipping; /* If were skipping on entry. */ | |
6cf87ca4 | 48 | int type; /* Most recent conditional for diagnostics. */ |
88ae23e7 | 49 | }; |
88ae23e7 | 50 | |
a5da89c6 | 51 | /* Contains a registered pragma or pragma namespace. */ |
6cf87ca4 | 52 | typedef void (*pragma_cb) (cpp_reader *); |
a5da89c6 NB |
53 | struct pragma_entry |
54 | { | |
55 | struct pragma_entry *next; | |
4b115ff0 | 56 | const cpp_hashnode *pragma; /* Name and length. */ |
a5da89c6 NB |
57 | int is_nspace; |
58 | union { | |
59 | pragma_cb handler; | |
60 | struct pragma_entry *space; | |
61 | } u; | |
62 | }; | |
63 | ||
93c80368 NB |
64 | /* Values for the origin field of struct directive. KANDR directives |
65 | come from traditional (K&R) C. STDC89 directives come from the | |
66 | 1989 C standard. EXTENSION directives are extensions. */ | |
67 | #define KANDR 0 | |
68 | #define STDC89 1 | |
69 | #define EXTENSION 2 | |
70 | ||
71 | /* Values for the flags field of struct directive. COND indicates a | |
72 | conditional; IF_COND an opening conditional. INCL means to treat | |
73 | "..." and <...> as q-char and h-char sequences respectively. IN_I | |
74 | means this directive should be handled even if -fpreprocessed is in | |
1a76916c NB |
75 | effect (these are the directives with callback hooks). |
76 | ||
d97371e0 | 77 | EXPAND is set on directives that are always macro-expanded. */ |
93c80368 NB |
78 | #define COND (1 << 0) |
79 | #define IF_COND (1 << 1) | |
80 | #define INCL (1 << 2) | |
81 | #define IN_I (1 << 3) | |
1a76916c | 82 | #define EXPAND (1 << 4) |
93c80368 NB |
83 | |
84 | /* Defines one #-directive, including how to handle it. */ | |
6cf87ca4 | 85 | typedef void (*directive_handler) (cpp_reader *); |
93c80368 NB |
86 | typedef struct directive directive; |
87 | struct directive | |
88 | { | |
89 | directive_handler handler; /* Function to handle directive. */ | |
562a5c27 | 90 | const uchar *name; /* Name of directive. */ |
93c80368 NB |
91 | unsigned short length; /* Length of name. */ |
92 | unsigned char origin; /* Origin of directive. */ | |
93 | unsigned char flags; /* Flags describing this directive. */ | |
94 | }; | |
95 | ||
1316f1f7 ZW |
96 | /* Forward declarations. */ |
97 | ||
6cf87ca4 ZW |
98 | static void skip_rest_of_line (cpp_reader *); |
99 | static void check_eol (cpp_reader *); | |
100 | static void start_directive (cpp_reader *); | |
101 | static void prepare_directive_trad (cpp_reader *); | |
102 | static void end_directive (cpp_reader *, int); | |
103 | static void directive_diagnostics (cpp_reader *, const directive *, int); | |
104 | static void run_directive (cpp_reader *, int, const char *, size_t); | |
105 | static char *glue_header_name (cpp_reader *); | |
106 | static const char *parse_include (cpp_reader *, int *); | |
107 | static void push_conditional (cpp_reader *, int, int, const cpp_hashnode *); | |
108 | static unsigned int read_flag (cpp_reader *, unsigned int); | |
6cf87ca4 ZW |
109 | static int strtoul_for_line (const uchar *, unsigned int, unsigned long *); |
110 | static void do_diagnostic (cpp_reader *, int, int); | |
111 | static cpp_hashnode *lex_macro_node (cpp_reader *); | |
d1bd0ded | 112 | static int undefine_macros (cpp_reader *, cpp_hashnode *, void *); |
6cf87ca4 ZW |
113 | static void do_include_common (cpp_reader *, enum include_type); |
114 | static struct pragma_entry *lookup_pragma_entry (struct pragma_entry *, | |
115 | const cpp_hashnode *); | |
116 | static struct pragma_entry *insert_pragma_entry (cpp_reader *, | |
117 | struct pragma_entry **, | |
118 | const cpp_hashnode *, | |
119 | pragma_cb); | |
120 | static int count_registered_pragmas (struct pragma_entry *); | |
121 | static char ** save_registered_pragmas (struct pragma_entry *, char **); | |
122 | static char ** restore_registered_pragmas (cpp_reader *, struct pragma_entry *, | |
123 | char **); | |
124 | static void do_pragma_once (cpp_reader *); | |
125 | static void do_pragma_poison (cpp_reader *); | |
126 | static void do_pragma_system_header (cpp_reader *); | |
127 | static void do_pragma_dependency (cpp_reader *); | |
128 | static void do_linemarker (cpp_reader *); | |
129 | static const cpp_token *get_token_no_padding (cpp_reader *); | |
130 | static const cpp_token *get__Pragma_string (cpp_reader *); | |
131 | static void destringize_and_run (cpp_reader *, const cpp_string *); | |
132 | static int parse_answer (cpp_reader *, struct answer **, int); | |
133 | static cpp_hashnode *parse_assertion (cpp_reader *, struct answer **, int); | |
134 | static struct answer ** find_answer (cpp_hashnode *, const struct answer *); | |
135 | static void handle_assertion (cpp_reader *, const char *, int); | |
d481b69b | 136 | |
168d3732 ZW |
137 | /* This is the table of directive handlers. It is ordered by |
138 | frequency of occurrence; the numbers at the end are directive | |
139 | counts from all the source code I have lying around (egcs and libc | |
140 | CVS as of 1999-05-18, plus grub-0.5.91, linux-2.2.9, and | |
93c80368 NB |
141 | pcmcia-cs-3.0.9). This is no longer important as directive lookup |
142 | is now O(1). All extensions other than #warning and #include_next | |
143 | are deprecated. The name is where the extension appears to have | |
144 | come from. */ | |
168d3732 | 145 | |
93c80368 NB |
146 | #define DIRECTIVE_TABLE \ |
147 | D(define, T_DEFINE = 0, KANDR, IN_I) /* 270554 */ \ | |
d97371e0 | 148 | D(include, T_INCLUDE, KANDR, INCL | EXPAND) /* 52262 */ \ |
93c80368 NB |
149 | D(endif, T_ENDIF, KANDR, COND) /* 45855 */ \ |
150 | D(ifdef, T_IFDEF, KANDR, COND | IF_COND) /* 22000 */ \ | |
1a76916c | 151 | D(if, T_IF, KANDR, COND | IF_COND | EXPAND) /* 18162 */ \ |
93c80368 NB |
152 | D(else, T_ELSE, KANDR, COND) /* 9863 */ \ |
153 | D(ifndef, T_IFNDEF, KANDR, COND | IF_COND) /* 9675 */ \ | |
154 | D(undef, T_UNDEF, KANDR, IN_I) /* 4837 */ \ | |
1a76916c NB |
155 | D(line, T_LINE, KANDR, EXPAND) /* 2465 */ \ |
156 | D(elif, T_ELIF, STDC89, COND | EXPAND) /* 610 */ \ | |
93c80368 NB |
157 | D(error, T_ERROR, STDC89, 0) /* 475 */ \ |
158 | D(pragma, T_PRAGMA, STDC89, IN_I) /* 195 */ \ | |
159 | D(warning, T_WARNING, EXTENSION, 0) /* 22 */ \ | |
d97371e0 | 160 | D(include_next, T_INCLUDE_NEXT, EXTENSION, INCL | EXPAND) /* 19 */ \ |
93c80368 | 161 | D(ident, T_IDENT, EXTENSION, IN_I) /* 11 */ \ |
d97371e0 | 162 | D(import, T_IMPORT, EXTENSION, INCL | EXPAND) /* 0 ObjC */ \ |
93c80368 NB |
163 | D(assert, T_ASSERT, EXTENSION, 0) /* 0 SVR4 */ \ |
164 | D(unassert, T_UNASSERT, EXTENSION, 0) /* 0 SVR4 */ \ | |
74d06cf2 | 165 | D(sccs, T_SCCS, EXTENSION, 0) /* 0 SVR4? */ |
07aa0b04 | 166 | |
168d3732 ZW |
167 | /* Use the table to generate a series of prototypes, an enum for the |
168 | directive names, and an array of directive handlers. */ | |
169 | ||
6cf87ca4 | 170 | #define D(name, t, o, f) static void do_##name (cpp_reader *); |
168d3732 ZW |
171 | DIRECTIVE_TABLE |
172 | #undef D | |
173 | ||
041c3194 | 174 | #define D(n, tag, o, f) tag, |
168d3732 ZW |
175 | enum |
176 | { | |
177 | DIRECTIVE_TABLE | |
178 | N_DIRECTIVES | |
7f2935c7 | 179 | }; |
168d3732 ZW |
180 | #undef D |
181 | ||
041c3194 | 182 | #define D(name, t, origin, flags) \ |
9a238586 KG |
183 | { do_##name, (const uchar *) #name, \ |
184 | sizeof #name - 1, origin, flags }, | |
93c80368 | 185 | static const directive dtable[] = |
168d3732 ZW |
186 | { |
187 | DIRECTIVE_TABLE | |
188 | }; | |
189 | #undef D | |
190 | #undef DIRECTIVE_TABLE | |
7f2935c7 | 191 | |
dcc229e5 ZW |
192 | /* Wrapper struct directive for linemarkers. |
193 | The origin is more or less true - the original K+R cpp | |
194 | did use this notation in its preprocessed output. */ | |
195 | static const directive linemarker_dir = | |
196 | { | |
197 | do_linemarker, U"#", 1, KANDR, IN_I | |
198 | }; | |
199 | ||
1a76916c | 200 | #define SEEN_EOL() (pfile->cur_token[-1].type == CPP_EOF) |
67821e3a | 201 | |
93c80368 NB |
202 | /* Skip any remaining tokens in a directive. */ |
203 | static void | |
6cf87ca4 | 204 | skip_rest_of_line (cpp_reader *pfile) |
c5a04734 | 205 | { |
93c80368 | 206 | /* Discard all stacked contexts. */ |
8128cccf | 207 | while (pfile->context->prev) |
93c80368 NB |
208 | _cpp_pop_context (pfile); |
209 | ||
b528a07e | 210 | /* Sweep up all tokens remaining on the line. */ |
345894b4 NB |
211 | if (! SEEN_EOL ()) |
212 | while (_cpp_lex_token (pfile)->type != CPP_EOF) | |
213 | ; | |
93c80368 | 214 | } |
c5a04734 | 215 | |
93c80368 NB |
216 | /* Ensure there are no stray tokens at the end of a directive. */ |
217 | static void | |
6cf87ca4 | 218 | check_eol (cpp_reader *pfile) |
93c80368 | 219 | { |
345894b4 | 220 | if (! SEEN_EOL () && _cpp_lex_token (pfile)->type != CPP_EOF) |
ebef4e8c NB |
221 | cpp_error (pfile, DL_PEDWARN, "extra tokens at end of #%s directive", |
222 | pfile->directive->name); | |
93c80368 NB |
223 | } |
224 | ||
fe6c2db9 NB |
225 | /* Called when entering a directive, _Pragma or command-line directive. */ |
226 | static void | |
6cf87ca4 | 227 | start_directive (cpp_reader *pfile) |
93c80368 | 228 | { |
7f2f1a66 NB |
229 | /* Setup in-directive state. */ |
230 | pfile->state.in_directive = 1; | |
231 | pfile->state.save_comments = 0; | |
232 | ||
93c80368 | 233 | /* Some handlers need the position of the # for diagnostics. */ |
8bbbef34 | 234 | pfile->directive_line = pfile->line; |
fe6c2db9 NB |
235 | } |
236 | ||
237 | /* Called when leaving a directive, _Pragma or command-line directive. */ | |
238 | static void | |
6cf87ca4 | 239 | end_directive (cpp_reader *pfile, int skip_line) |
fe6c2db9 | 240 | { |
1a76916c NB |
241 | if (CPP_OPTION (pfile, traditional)) |
242 | { | |
d97371e0 NB |
243 | /* Revert change of prepare_directive_trad. */ |
244 | pfile->state.prevent_expansion--; | |
245 | ||
b66377c1 | 246 | if (pfile->directive != &dtable[T_DEFINE]) |
1a76916c NB |
247 | _cpp_remove_overlay (pfile); |
248 | } | |
fe6c2db9 | 249 | /* We don't skip for an assembler #. */ |
b66377c1 | 250 | else if (skip_line) |
67821e3a NB |
251 | { |
252 | skip_rest_of_line (pfile); | |
bdcbe496 NB |
253 | if (!pfile->keep_tokens) |
254 | { | |
255 | pfile->cur_run = &pfile->base_run; | |
256 | pfile->cur_token = pfile->base_run.base; | |
257 | } | |
67821e3a | 258 | } |
fe6c2db9 NB |
259 | |
260 | /* Restore state. */ | |
fe6c2db9 NB |
261 | pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); |
262 | pfile->state.in_directive = 0; | |
d97371e0 | 263 | pfile->state.in_expression = 0; |
fe6c2db9 NB |
264 | pfile->state.angled_headers = 0; |
265 | pfile->directive = 0; | |
266 | } | |
267 | ||
1a76916c NB |
268 | /* Prepare to handle the directive in pfile->directive. */ |
269 | static void | |
6cf87ca4 | 270 | prepare_directive_trad (cpp_reader *pfile) |
1a76916c | 271 | { |
951a0766 | 272 | if (pfile->directive != &dtable[T_DEFINE]) |
1a76916c | 273 | { |
b66377c1 NB |
274 | bool no_expand = (pfile->directive |
275 | && ! (pfile->directive->flags & EXPAND)); | |
974c43f1 | 276 | bool was_skipping = pfile->state.skipping; |
1a76916c | 277 | |
974c43f1 | 278 | pfile->state.skipping = false; |
d97371e0 NB |
279 | pfile->state.in_expression = (pfile->directive == &dtable[T_IF] |
280 | || pfile->directive == &dtable[T_ELIF]); | |
1a76916c NB |
281 | if (no_expand) |
282 | pfile->state.prevent_expansion++; | |
26aea073 | 283 | scan_out_logical_line (pfile, NULL); |
1a76916c NB |
284 | if (no_expand) |
285 | pfile->state.prevent_expansion--; | |
974c43f1 | 286 | pfile->state.skipping = was_skipping; |
1a76916c NB |
287 | _cpp_overlay_buffer (pfile, pfile->out.base, |
288 | pfile->out.cur - pfile->out.base); | |
289 | } | |
d97371e0 NB |
290 | |
291 | /* Stop ISO C from expanding anything. */ | |
292 | pfile->state.prevent_expansion++; | |
1a76916c NB |
293 | } |
294 | ||
da7d8304 | 295 | /* Output diagnostics for a directive DIR. INDENTED is nonzero if |
18a9d8ff | 296 | the '#' was indented. */ |
18a9d8ff | 297 | static void |
6cf87ca4 | 298 | directive_diagnostics (cpp_reader *pfile, const directive *dir, int indented) |
18a9d8ff | 299 | { |
dcc229e5 ZW |
300 | /* Issue -pedantic warnings for extensions. */ |
301 | if (CPP_PEDANTIC (pfile) | |
302 | && ! pfile->state.skipping | |
303 | && dir->origin == EXTENSION) | |
ebef4e8c | 304 | cpp_error (pfile, DL_PEDWARN, "#%s is a GCC extension", dir->name); |
dcc229e5 ZW |
305 | |
306 | /* Traditionally, a directive is ignored unless its # is in | |
307 | column 1. Therefore in code intended to work with K+R | |
308 | compilers, directives added by C89 must have their # | |
309 | indented, and directives present in traditional C must not. | |
310 | This is true even of directives in skipped conditional | |
311 | blocks. #elif cannot be used at all. */ | |
312 | if (CPP_WTRADITIONAL (pfile)) | |
18a9d8ff | 313 | { |
dcc229e5 | 314 | if (dir == &dtable[T_ELIF]) |
ebef4e8c NB |
315 | cpp_error (pfile, DL_WARNING, |
316 | "suggest not using #elif in traditional C"); | |
dcc229e5 | 317 | else if (indented && dir->origin == KANDR) |
ebef4e8c NB |
318 | cpp_error (pfile, DL_WARNING, |
319 | "traditional C ignores #%s with the # indented", | |
320 | dir->name); | |
dcc229e5 | 321 | else if (!indented && dir->origin != KANDR) |
ebef4e8c NB |
322 | cpp_error (pfile, DL_WARNING, |
323 | "suggest hiding #%s from traditional C with an indented #", | |
324 | dir->name); | |
18a9d8ff NB |
325 | } |
326 | } | |
327 | ||
da7d8304 | 328 | /* Check if we have a known directive. INDENTED is nonzero if the |
18a9d8ff NB |
329 | '#' of the directive was indented. This function is in this file |
330 | to save unnecessarily exporting dtable etc. to cpplex.c. Returns | |
da7d8304 | 331 | nonzero if the line of tokens has been handled, zero if we should |
18a9d8ff | 332 | continue processing the line. */ |
fe6c2db9 | 333 | int |
6cf87ca4 | 334 | _cpp_handle_directive (cpp_reader *pfile, int indented) |
fe6c2db9 | 335 | { |
fe6c2db9 | 336 | const directive *dir = 0; |
345894b4 | 337 | const cpp_token *dname; |
e808ec9c | 338 | bool was_parsing_args = pfile->state.parsing_args; |
fe6c2db9 NB |
339 | int skip = 1; |
340 | ||
e808ec9c NB |
341 | if (was_parsing_args) |
342 | { | |
343 | if (CPP_OPTION (pfile, pedantic)) | |
ebef4e8c | 344 | cpp_error (pfile, DL_PEDWARN, |
e808ec9c NB |
345 | "embedding a directive within macro arguments is not portable"); |
346 | pfile->state.parsing_args = 0; | |
347 | pfile->state.prevent_expansion = 0; | |
348 | } | |
fe6c2db9 | 349 | start_directive (pfile); |
345894b4 | 350 | dname = _cpp_lex_token (pfile); |
0d9f234d | 351 | |
345894b4 | 352 | if (dname->type == CPP_NAME) |
0d9f234d | 353 | { |
4977bab6 ZW |
354 | if (dname->val.node->is_directive) |
355 | dir = &dtable[dname->val.node->directive_index]; | |
0d9f234d | 356 | } |
05713b80 | 357 | /* We do not recognize the # followed by a number extension in |
18a9d8ff | 358 | assembler code. */ |
345894b4 | 359 | else if (dname->type == CPP_NUMBER && CPP_OPTION (pfile, lang) != CLK_ASM) |
0d9f234d | 360 | { |
dcc229e5 ZW |
361 | dir = &linemarker_dir; |
362 | if (CPP_PEDANTIC (pfile) && ! CPP_OPTION (pfile, preprocessed) | |
363 | && ! pfile->state.skipping) | |
ebef4e8c NB |
364 | cpp_error (pfile, DL_PEDWARN, |
365 | "style of line directive is a GCC extension"); | |
93c80368 | 366 | } |
0d9f234d | 367 | |
93c80368 NB |
368 | if (dir) |
369 | { | |
18a9d8ff NB |
370 | /* If we have a directive that is not an opening conditional, |
371 | invalidate any control macro. */ | |
372 | if (! (dir->flags & IF_COND)) | |
373 | pfile->mi_valid = false; | |
374 | ||
375 | /* Kluge alert. In order to be sure that code like this | |
376 | ||
377 | #define HASH # | |
378 | HASH define foo bar | |
379 | ||
380 | does not cause '#define foo bar' to get executed when | |
381 | compiled with -save-temps, we recognize directives in | |
382 | -fpreprocessed mode only if the # is in column 1. cppmacro.c | |
a1f300c0 | 383 | puts a space in front of any '#' at the start of a macro. */ |
18a9d8ff NB |
384 | if (CPP_OPTION (pfile, preprocessed) |
385 | && (indented || !(dir->flags & IN_I))) | |
6d4587f7 | 386 | { |
18a9d8ff NB |
387 | skip = 0; |
388 | dir = 0; | |
6d4587f7 ZW |
389 | } |
390 | else | |
93c80368 | 391 | { |
18a9d8ff NB |
392 | /* In failed conditional groups, all non-conditional |
393 | directives are ignored. Before doing that, whether | |
394 | skipping or not, we should lex angle-bracketed headers | |
395 | correctly, and maybe output some diagnostics. */ | |
396 | pfile->state.angled_headers = dir->flags & INCL; | |
a8d0ddaf | 397 | pfile->state.directive_wants_padding = dir->flags & INCL; |
18a9d8ff NB |
398 | if (! CPP_OPTION (pfile, preprocessed)) |
399 | directive_diagnostics (pfile, dir, indented); | |
400 | if (pfile->state.skipping && !(dir->flags & COND)) | |
401 | dir = 0; | |
93c80368 NB |
402 | } |
403 | } | |
345894b4 | 404 | else if (dname->type == CPP_EOF) |
18a9d8ff NB |
405 | ; /* CPP_EOF is the "null directive". */ |
406 | else | |
93c80368 NB |
407 | { |
408 | /* An unknown directive. Don't complain about it in assembly | |
409 | source: we don't know where the comments are, and # may | |
410 | introduce assembler pseudo-ops. Don't complain about invalid | |
411 | directives in skipped conditional groups (6.10 p4). */ | |
bdb05a7b | 412 | if (CPP_OPTION (pfile, lang) == CLK_ASM) |
18a9d8ff NB |
413 | skip = 0; |
414 | else if (!pfile->state.skipping) | |
ebef4e8c | 415 | cpp_error (pfile, DL_ERROR, "invalid preprocessing directive #%s", |
345894b4 | 416 | cpp_token_as_text (pfile, dname)); |
0d9f234d NB |
417 | } |
418 | ||
d1a58688 NB |
419 | pfile->directive = dir; |
420 | if (CPP_OPTION (pfile, traditional)) | |
421 | prepare_directive_trad (pfile); | |
422 | ||
18a9d8ff | 423 | if (dir) |
6cf87ca4 | 424 | pfile->directive->handler (pfile); |
18a9d8ff NB |
425 | else if (skip == 0) |
426 | _cpp_backup_tokens (pfile, 1); | |
427 | ||
428 | end_directive (pfile, skip); | |
e808ec9c NB |
429 | if (was_parsing_args) |
430 | { | |
431 | /* Restore state when within macro args. */ | |
432 | pfile->state.parsing_args = 2; | |
433 | pfile->state.prevent_expansion = 1; | |
e808ec9c | 434 | } |
fe6c2db9 | 435 | return skip; |
041c3194 | 436 | } |
7f2935c7 | 437 | |
93c80368 | 438 | /* Directive handler wrapper used by the command line option |
26aea073 | 439 | processor. BUF is \n terminated. */ |
93c80368 | 440 | static void |
6cf87ca4 | 441 | run_directive (cpp_reader *pfile, int dir_no, const char *buf, size_t count) |
3fdc651f | 442 | { |
562a5c27 | 443 | cpp_push_buffer (pfile, (const uchar *) buf, count, |
29401c30 | 444 | /* from_stage3 */ true, 1); |
8bfb1467 NB |
445 | /* Disgusting hack. */ |
446 | if (dir_no == T_PRAGMA) | |
447 | pfile->buffer->inc = pfile->buffer->prev->inc; | |
0bda4760 | 448 | start_directive (pfile); |
26aea073 NB |
449 | |
450 | /* This is a short-term fix to prevent a leading '#' being | |
451 | interpreted as a directive. */ | |
452 | _cpp_clean_line (pfile); | |
453 | ||
f71aebba | 454 | pfile->directive = &dtable[dir_no]; |
1a76916c NB |
455 | if (CPP_OPTION (pfile, traditional)) |
456 | prepare_directive_trad (pfile); | |
6cf87ca4 | 457 | pfile->directive->handler (pfile); |
0bda4760 | 458 | end_directive (pfile, 1); |
8bfb1467 NB |
459 | if (dir_no == T_PRAGMA) |
460 | pfile->buffer->inc = NULL; | |
ef6e958a | 461 | _cpp_pop_buffer (pfile); |
93c80368 NB |
462 | } |
463 | ||
464 | /* Checks for validity the macro name in #define, #undef, #ifdef and | |
465 | #ifndef directives. */ | |
041c3194 | 466 | static cpp_hashnode * |
6cf87ca4 | 467 | lex_macro_node (cpp_reader *pfile) |
041c3194 | 468 | { |
1a76916c | 469 | const cpp_token *token = _cpp_lex_token (pfile); |
ea4a453b | 470 | |
92936ecf | 471 | /* The token immediately after #define must be an identifier. That |
b8363a24 ZW |
472 | identifier may not be "defined", per C99 6.10.8p4. |
473 | In C++, it may not be any of the "named operators" either, | |
474 | per C++98 [lex.digraph], [lex.key]. | |
475 | Finally, the identifier may not have been poisoned. (In that case | |
1d63a28a | 476 | the lexer has issued the error message for us.) */ |
cbc69f84 | 477 | |
1a76916c NB |
478 | if (token->type == CPP_NAME) |
479 | { | |
480 | cpp_hashnode *node = token->val.node; | |
92936ecf | 481 | |
1a76916c NB |
482 | if (node == pfile->spec_nodes.n_defined) |
483 | cpp_error (pfile, DL_ERROR, | |
484 | "\"defined\" cannot be used as a macro name"); | |
485 | else if (! (node->flags & NODE_POISONED)) | |
486 | return node; | |
ba89d661 | 487 | } |
1a76916c | 488 | else if (token->flags & NAMED_OP) |
cbc69f84 NB |
489 | cpp_error (pfile, DL_ERROR, |
490 | "\"%s\" cannot be used as a macro name as it is an operator in C++", | |
1a76916c NB |
491 | NODE_NAME (token->val.node)); |
492 | else if (token->type == CPP_EOF) | |
493 | cpp_error (pfile, DL_ERROR, "no macro name given in #%s directive", | |
494 | pfile->directive->name); | |
495 | else | |
496 | cpp_error (pfile, DL_ERROR, "macro names must be identifiers"); | |
07aa0b04 | 497 | |
cbc69f84 | 498 | return NULL; |
7f2935c7 | 499 | } |
7f2935c7 | 500 | |
93c80368 | 501 | /* Process a #define directive. Most work is done in cppmacro.c. */ |
711b8824 | 502 | static void |
6cf87ca4 | 503 | do_define (cpp_reader *pfile) |
7f2935c7 | 504 | { |
93c80368 | 505 | cpp_hashnode *node = lex_macro_node (pfile); |
ff2b53ef | 506 | |
93c80368 NB |
507 | if (node) |
508 | { | |
1d63a28a NB |
509 | /* If we have been requested to expand comments into macros, |
510 | then re-enable saving of comments. */ | |
511 | pfile->state.save_comments = | |
512 | ! CPP_OPTION (pfile, discard_comments_in_macro_exp); | |
513 | ||
93c80368 NB |
514 | if (_cpp_create_definition (pfile, node)) |
515 | if (pfile->cb.define) | |
6cf87ca4 | 516 | pfile->cb.define (pfile, pfile->directive_line, node); |
93c80368 | 517 | } |
041c3194 ZW |
518 | } |
519 | ||
5d8ebbd8 | 520 | /* Handle #undef. Mark the identifier NT_VOID in the hash table. */ |
711b8824 | 521 | static void |
6cf87ca4 | 522 | do_undef (cpp_reader *pfile) |
041c3194 | 523 | { |
df383483 | 524 | cpp_hashnode *node = lex_macro_node (pfile); |
9e62c811 | 525 | |
041c3194 ZW |
526 | /* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified identifier |
527 | is not currently defined as a macro name. */ | |
93c80368 | 528 | if (node && node->type == NT_MACRO) |
9e62c811 | 529 | { |
58fea6af | 530 | if (pfile->cb.undef) |
6cf87ca4 | 531 | pfile->cb.undef (pfile, pfile->directive_line, node); |
9e62c811 | 532 | |
618cdda7 | 533 | if (node->flags & NODE_WARN) |
ebef4e8c | 534 | cpp_error (pfile, DL_WARNING, "undefining \"%s\"", NODE_NAME (node)); |
9e62c811 | 535 | |
a69cbaac NB |
536 | if (CPP_OPTION (pfile, warn_unused_macros)) |
537 | _cpp_warn_if_unused_macro (pfile, node, NULL); | |
538 | ||
041c3194 | 539 | _cpp_free_definition (node); |
9e62c811 | 540 | } |
93c80368 | 541 | check_eol (pfile); |
7f2935c7 PB |
542 | } |
543 | ||
d1bd0ded GK |
544 | /* Undefine a single macro/assertion/whatever. */ |
545 | ||
546 | static int | |
547 | undefine_macros (cpp_reader *pfile, cpp_hashnode *h, | |
548 | void *data_p ATTRIBUTE_UNUSED) | |
549 | { | |
550 | switch (h->type) | |
551 | { | |
552 | case NT_VOID: | |
553 | break; | |
554 | ||
555 | case NT_MACRO: | |
556 | if (pfile->cb.undef) | |
557 | (*pfile->cb.undef) (pfile, pfile->directive_line, h); | |
558 | ||
559 | if (CPP_OPTION (pfile, warn_unused_macros)) | |
560 | _cpp_warn_if_unused_macro (pfile, h, NULL); | |
561 | ||
4ed43216 | 562 | /* and fall through... */ |
d1bd0ded GK |
563 | case NT_ASSERTION: |
564 | _cpp_free_definition (h); | |
565 | break; | |
566 | ||
567 | default: | |
568 | abort (); | |
569 | } | |
570 | h->flags &= ~NODE_POISONED; | |
571 | return 1; | |
572 | } | |
573 | ||
574 | /* Undefine all macros and assertions. */ | |
575 | ||
576 | void | |
577 | cpp_undef_all (cpp_reader *pfile) | |
578 | { | |
579 | cpp_forall_identifiers (pfile, undefine_macros, NULL); | |
580 | } | |
581 | ||
582 | ||
93c80368 NB |
583 | /* Helper routine used by parse_include. Reinterpret the current line |
584 | as an h-char-sequence (< ... >); we are looking at the first token | |
74eb4b3e NB |
585 | after the <. Returns a malloced filename. */ |
586 | static char * | |
6cf87ca4 | 587 | glue_header_name (cpp_reader *pfile) |
93c80368 | 588 | { |
4ed5bcfb | 589 | const cpp_token *token; |
74eb4b3e | 590 | char *buffer; |
2450e0b8 | 591 | size_t len, total_len = 0, capacity = 1024; |
93c80368 NB |
592 | |
593 | /* To avoid lexed tokens overwriting our glued name, we can only | |
594 | allocate from the string pool once we've lexed everything. */ | |
74eb4b3e | 595 | buffer = xmalloc (capacity); |
93c80368 NB |
596 | for (;;) |
597 | { | |
a8d0ddaf | 598 | token = get_token_no_padding (pfile); |
93c80368 | 599 | |
74eb4b3e | 600 | if (token->type == CPP_GREATER) |
93c80368 | 601 | break; |
74eb4b3e NB |
602 | if (token->type == CPP_EOF) |
603 | { | |
604 | cpp_error (pfile, DL_ERROR, "missing terminating > character"); | |
605 | break; | |
606 | } | |
93c80368 | 607 | |
59325650 | 608 | len = cpp_token_len (token) + 2; /* Leading space, terminating \0. */ |
2450e0b8 | 609 | if (total_len + len > capacity) |
93c80368 | 610 | { |
2450e0b8 | 611 | capacity = (capacity + len) * 2; |
74eb4b3e | 612 | buffer = xrealloc (buffer, capacity); |
93c80368 NB |
613 | } |
614 | ||
4ed5bcfb | 615 | if (token->flags & PREV_WHITE) |
2450e0b8 | 616 | buffer[total_len++] = ' '; |
93c80368 | 617 | |
74eb4b3e NB |
618 | total_len = (cpp_spell_token (pfile, token, (uchar *) &buffer[total_len]) |
619 | - (uchar *) buffer); | |
93c80368 | 620 | } |
041c3194 | 621 | |
74eb4b3e NB |
622 | buffer[total_len] = '\0'; |
623 | return buffer; | |
93c80368 | 624 | } |
7f2935c7 | 625 | |
74eb4b3e NB |
626 | /* Returns the file name of #include, #include_next, #import and |
627 | #pragma dependency. The string is malloced and the caller should | |
628 | free it. Returns NULL on error. */ | |
629 | static const char * | |
6cf87ca4 | 630 | parse_include (cpp_reader *pfile, int *pangle_brackets) |
7f2935c7 | 631 | { |
74eb4b3e | 632 | char *fname; |
4ed5bcfb | 633 | const cpp_token *header; |
7f2935c7 | 634 | |
93c80368 | 635 | /* Allow macro expansion. */ |
a8d0ddaf | 636 | header = get_token_no_padding (pfile); |
74eb4b3e | 637 | if (header->type == CPP_STRING || header->type == CPP_HEADER_NAME) |
7f2935c7 | 638 | { |
6338b358 NB |
639 | fname = xmalloc (header->val.str.len - 1); |
640 | memcpy (fname, header->val.str.text + 1, header->val.str.len - 2); | |
641 | fname[header->val.str.len - 2] = '\0'; | |
74eb4b3e | 642 | *pangle_brackets = header->type == CPP_HEADER_NAME; |
7f2935c7 | 643 | } |
74eb4b3e | 644 | else if (header->type == CPP_LESS) |
7f2935c7 | 645 | { |
74eb4b3e NB |
646 | fname = glue_header_name (pfile); |
647 | *pangle_brackets = 1; | |
648 | } | |
649 | else | |
650 | { | |
651 | const unsigned char *dir; | |
652 | ||
653 | if (pfile->directive == &dtable[T_PRAGMA]) | |
654 | dir = U"pragma dependency"; | |
655 | else | |
656 | dir = pfile->directive->name; | |
657 | cpp_error (pfile, DL_ERROR, "#%s expects \"FILENAME\" or <FILENAME>", | |
658 | dir); | |
659 | ||
4ed5bcfb | 660 | return NULL; |
7f2935c7 | 661 | } |
7f2935c7 | 662 | |
3963c2e0 | 663 | check_eol (pfile); |
74eb4b3e | 664 | return fname; |
168d3732 | 665 | } |
3caee4a8 | 666 | |
ba133c96 | 667 | /* Handle #include, #include_next and #import. */ |
711b8824 | 668 | static void |
6cf87ca4 | 669 | do_include_common (cpp_reader *pfile, enum include_type type) |
168d3732 | 670 | { |
74eb4b3e NB |
671 | const char *fname; |
672 | int angle_brackets; | |
673 | ||
674 | fname = parse_include (pfile, &angle_brackets); | |
675 | if (!fname) | |
3963c2e0 | 676 | return; |
7f2935c7 | 677 | |
3963c2e0 ZW |
678 | /* Prevent #include recursion. */ |
679 | if (pfile->line_maps.depth >= CPP_STACK_MAX) | |
74eb4b3e NB |
680 | cpp_error (pfile, DL_ERROR, "#include nested too deeply"); |
681 | else | |
09b82253 | 682 | { |
74eb4b3e NB |
683 | /* Get out of macro context, if we are. */ |
684 | skip_rest_of_line (pfile); | |
09b82253 | 685 | |
74eb4b3e | 686 | if (pfile->cb.include) |
6cf87ca4 ZW |
687 | pfile->cb.include (pfile, pfile->directive_line, |
688 | pfile->directive->name, fname, angle_brackets); | |
3963c2e0 | 689 | |
74eb4b3e NB |
690 | _cpp_execute_include (pfile, fname, angle_brackets, type); |
691 | } | |
3963c2e0 | 692 | |
fad205ff | 693 | free ((void *) fname); |
168d3732 | 694 | } |
e8037d57 | 695 | |
711b8824 | 696 | static void |
6cf87ca4 | 697 | do_include (cpp_reader *pfile) |
168d3732 | 698 | { |
ba133c96 NB |
699 | do_include_common (pfile, IT_INCLUDE); |
700 | } | |
168d3732 | 701 | |
ba133c96 | 702 | static void |
6cf87ca4 | 703 | do_import (cpp_reader *pfile) |
ba133c96 | 704 | { |
3963c2e0 ZW |
705 | if (CPP_OPTION (pfile, warn_import)) |
706 | { | |
707 | CPP_OPTION (pfile, warn_import) = 0; | |
708 | cpp_error (pfile, DL_WARNING, | |
709 | "#import is obsolete, use an #ifndef wrapper in the header file"); | |
710 | } | |
711 | ||
ba133c96 | 712 | do_include_common (pfile, IT_IMPORT); |
168d3732 | 713 | } |
7f2935c7 | 714 | |
711b8824 | 715 | static void |
6cf87ca4 | 716 | do_include_next (cpp_reader *pfile) |
168d3732 | 717 | { |
3963c2e0 ZW |
718 | enum include_type type = IT_INCLUDE_NEXT; |
719 | ||
720 | /* If this is the primary source file, warn and use the normal | |
721 | search logic. */ | |
722 | if (! pfile->buffer->prev) | |
723 | { | |
724 | cpp_error (pfile, DL_WARNING, | |
725 | "#include_next in primary source file"); | |
726 | type = IT_INCLUDE; | |
727 | } | |
728 | do_include_common (pfile, type); | |
7f2935c7 | 729 | } |
7f2935c7 | 730 | |
dcc229e5 ZW |
731 | /* Subroutine of do_linemarker. Read possible flags after file name. |
732 | LAST is the last flag seen; 0 if this is the first flag. Return the | |
733 | flag if it is valid, 0 at the end of the directive. Otherwise | |
734 | complain. */ | |
642ce434 | 735 | static unsigned int |
6cf87ca4 | 736 | read_flag (cpp_reader *pfile, unsigned int last) |
d3a34a0a | 737 | { |
345894b4 | 738 | const cpp_token *token = _cpp_lex_token (pfile); |
d3a34a0a | 739 | |
345894b4 | 740 | if (token->type == CPP_NUMBER && token->val.str.len == 1) |
d3a34a0a | 741 | { |
345894b4 | 742 | unsigned int flag = token->val.str.text[0] - '0'; |
28e0f040 NB |
743 | |
744 | if (flag > last && flag <= 4 | |
745 | && (flag != 4 || last == 3) | |
746 | && (flag != 2 || last == 0)) | |
747 | return flag; | |
d3a34a0a | 748 | } |
93c80368 | 749 | |
345894b4 | 750 | if (token->type != CPP_EOF) |
ebef4e8c | 751 | cpp_error (pfile, DL_ERROR, "invalid flag \"%s\" in line directive", |
345894b4 | 752 | cpp_token_as_text (pfile, token)); |
93c80368 | 753 | return 0; |
d3a34a0a JM |
754 | } |
755 | ||
dcc229e5 ZW |
756 | /* Subroutine of do_line and do_linemarker. Convert a number in STR, |
757 | of length LEN, to binary; store it in NUMP, and return 0 if the | |
758 | number was well-formed, 1 if not. Temporary, hopefully. */ | |
041c3194 | 759 | static int |
6cf87ca4 | 760 | strtoul_for_line (const uchar *str, unsigned int len, long unsigned int *nump) |
041c3194 ZW |
761 | { |
762 | unsigned long reg = 0; | |
562a5c27 | 763 | uchar c; |
041c3194 ZW |
764 | while (len--) |
765 | { | |
766 | c = *str++; | |
767 | if (!ISDIGIT (c)) | |
768 | return 1; | |
769 | reg *= 10; | |
770 | reg += c - '0'; | |
771 | } | |
772 | *nump = reg; | |
773 | return 0; | |
774 | } | |
775 | ||
6de1e2a9 | 776 | /* Interpret #line command. |
dcc229e5 ZW |
777 | Note that the filename string (if any) is a true string constant |
778 | (escapes are interpreted), unlike in #line. */ | |
711b8824 | 779 | static void |
6cf87ca4 | 780 | do_line (cpp_reader *pfile) |
7f2935c7 | 781 | { |
4ed5bcfb | 782 | const cpp_token *token; |
bb74c963 NB |
783 | const char *new_file = pfile->map->to_file; |
784 | unsigned long new_lineno; | |
93c80368 | 785 | |
27e2564a | 786 | /* C99 raised the minimum limit on #line numbers. */ |
dcc229e5 | 787 | unsigned int cap = CPP_OPTION (pfile, c99) ? 2147483647 : 32767; |
18a9d8ff | 788 | |
93c80368 | 789 | /* #line commands expand macros. */ |
4ed5bcfb NB |
790 | token = cpp_get_token (pfile); |
791 | if (token->type != CPP_NUMBER | |
792 | || strtoul_for_line (token->val.str.text, token->val.str.len, | |
793 | &new_lineno)) | |
7f2935c7 | 794 | { |
ebef4e8c NB |
795 | cpp_error (pfile, DL_ERROR, |
796 | "\"%s\" after #line is not a positive integer", | |
4ed5bcfb | 797 | cpp_token_as_text (pfile, token)); |
9ec7291f | 798 | return; |
df383483 | 799 | } |
7f2935c7 | 800 | |
dcc229e5 | 801 | if (CPP_PEDANTIC (pfile) && (new_lineno == 0 || new_lineno > cap)) |
ebef4e8c | 802 | cpp_error (pfile, DL_PEDWARN, "line number out of range"); |
7f2935c7 | 803 | |
4ed5bcfb NB |
804 | token = cpp_get_token (pfile); |
805 | if (token->type == CPP_STRING) | |
5538ada6 | 806 | { |
e6cc3a24 | 807 | cpp_string s = { 0, 0 }; |
6b88314c | 808 | if (_cpp_interpret_string_notranslate (pfile, &token->val.str, &s)) |
e6cc3a24 | 809 | new_file = (const char *)s.text; |
dcc229e5 ZW |
810 | check_eol (pfile); |
811 | } | |
812 | else if (token->type != CPP_EOF) | |
813 | { | |
ebef4e8c | 814 | cpp_error (pfile, DL_ERROR, "\"%s\" is not a valid filename", |
dcc229e5 ZW |
815 | cpp_token_as_text (pfile, token)); |
816 | return; | |
817 | } | |
818 | ||
819 | skip_rest_of_line (pfile); | |
820 | _cpp_do_file_change (pfile, LC_RENAME, new_file, new_lineno, | |
821 | pfile->map->sysp); | |
822 | } | |
823 | ||
824 | /* Interpret the # 44 "file" [flags] notation, which has slightly | |
825 | different syntax and semantics from #line: Flags are allowed, | |
826 | and we never complain about the line number being too big. */ | |
827 | static void | |
6cf87ca4 | 828 | do_linemarker (cpp_reader *pfile) |
dcc229e5 ZW |
829 | { |
830 | const cpp_token *token; | |
831 | const char *new_file = pfile->map->to_file; | |
832 | unsigned long new_lineno; | |
833 | unsigned int new_sysp = pfile->map->sysp; | |
834 | enum lc_reason reason = LC_RENAME; | |
835 | int flag; | |
836 | ||
837 | /* Back up so we can get the number again. Putting this in | |
838 | _cpp_handle_directive risks two calls to _cpp_backup_tokens in | |
839 | some circumstances, which can segfault. */ | |
840 | _cpp_backup_tokens (pfile, 1); | |
841 | ||
842 | /* #line commands expand macros. */ | |
843 | token = cpp_get_token (pfile); | |
844 | if (token->type != CPP_NUMBER | |
845 | || strtoul_for_line (token->val.str.text, token->val.str.len, | |
846 | &new_lineno)) | |
847 | { | |
ebef4e8c | 848 | cpp_error (pfile, DL_ERROR, "\"%s\" after # is not a positive integer", |
dcc229e5 ZW |
849 | cpp_token_as_text (pfile, token)); |
850 | return; | |
df383483 | 851 | } |
941e09b6 | 852 | |
dcc229e5 ZW |
853 | token = cpp_get_token (pfile); |
854 | if (token->type == CPP_STRING) | |
855 | { | |
e6cc3a24 | 856 | cpp_string s = { 0, 0 }; |
6b88314c | 857 | if (_cpp_interpret_string_notranslate (pfile, &token->val.str, &s)) |
e6cc3a24 ZW |
858 | new_file = (const char *)s.text; |
859 | ||
dcc229e5 ZW |
860 | new_sysp = 0; |
861 | flag = read_flag (pfile, 0); | |
862 | if (flag == 1) | |
863 | { | |
864 | reason = LC_ENTER; | |
865 | /* Fake an include for cpp_included (). */ | |
866 | _cpp_fake_include (pfile, new_file); | |
867 | flag = read_flag (pfile, flag); | |
868 | } | |
869 | else if (flag == 2) | |
870 | { | |
871 | reason = LC_LEAVE; | |
872 | flag = read_flag (pfile, flag); | |
873 | } | |
874 | if (flag == 3) | |
93c80368 | 875 | { |
dcc229e5 ZW |
876 | new_sysp = 1; |
877 | flag = read_flag (pfile, flag); | |
878 | if (flag == 4) | |
879 | new_sysp = 2; | |
93c80368 | 880 | } |
dcc229e5 | 881 | |
fde84349 | 882 | check_eol (pfile); |
041c3194 | 883 | } |
4ed5bcfb | 884 | else if (token->type != CPP_EOF) |
27e2564a | 885 | { |
ebef4e8c | 886 | cpp_error (pfile, DL_ERROR, "\"%s\" is not a valid filename", |
4ed5bcfb | 887 | cpp_token_as_text (pfile, token)); |
27e2564a NB |
888 | return; |
889 | } | |
7f2935c7 | 890 | |
bdcbe496 | 891 | skip_rest_of_line (pfile); |
bb74c963 | 892 | _cpp_do_file_change (pfile, reason, new_file, new_lineno, new_sysp); |
27e2564a NB |
893 | } |
894 | ||
67821e3a | 895 | /* Arrange the file_change callback. pfile->line has changed to |
47d89cf3 | 896 | FILE_LINE of TO_FILE, for reason REASON. SYSP is 1 for a system |
a1f300c0 | 897 | header, 2 for a system header that needs to be extern "C" protected, |
47d89cf3 | 898 | and zero otherwise. */ |
eb1f4d9d | 899 | void |
6cf87ca4 ZW |
900 | _cpp_do_file_change (cpp_reader *pfile, enum lc_reason reason, |
901 | const char *to_file, unsigned int file_line, | |
902 | unsigned int sysp) | |
27e2564a | 903 | { |
47d89cf3 NB |
904 | pfile->map = add_line_map (&pfile->line_maps, reason, sysp, |
905 | pfile->line, to_file, file_line); | |
d82fc108 | 906 | |
eb1f4d9d | 907 | if (pfile->cb.file_change) |
6cf87ca4 | 908 | pfile->cb.file_change (pfile, pfile->map); |
7f2935c7 | 909 | } |
941e09b6 | 910 | |
5d8ebbd8 NB |
911 | /* Report a warning or error detected by the program we are |
912 | processing. Use the directive's tokens in the error message. */ | |
711b8824 | 913 | static void |
6cf87ca4 | 914 | do_diagnostic (cpp_reader *pfile, int code, int print_dir) |
7f2935c7 | 915 | { |
ebef4e8c NB |
916 | if (_cpp_begin_message (pfile, code, |
917 | pfile->cur_token[-1].line, | |
918 | pfile->cur_token[-1].col)) | |
58fea6af | 919 | { |
29b10746 NB |
920 | if (print_dir) |
921 | fprintf (stderr, "#%s ", pfile->directive->name); | |
93c80368 NB |
922 | pfile->state.prevent_expansion++; |
923 | cpp_output_line (pfile, stderr); | |
924 | pfile->state.prevent_expansion--; | |
58fea6af | 925 | } |
7f2935c7 PB |
926 | } |
927 | ||
838f313b | 928 | static void |
6cf87ca4 | 929 | do_error (cpp_reader *pfile) |
838f313b | 930 | { |
ebef4e8c | 931 | do_diagnostic (pfile, DL_ERROR, 1); |
838f313b | 932 | } |
7f2935c7 | 933 | |
711b8824 | 934 | static void |
6cf87ca4 | 935 | do_warning (cpp_reader *pfile) |
7f2935c7 | 936 | { |
2f878973 | 937 | /* We want #warning diagnostics to be emitted in system headers too. */ |
ebef4e8c | 938 | do_diagnostic (pfile, DL_WARNING_SYSHDR, 1); |
7f2935c7 PB |
939 | } |
940 | ||
a2a76ce7 | 941 | /* Report program identification. */ |
711b8824 | 942 | static void |
6cf87ca4 | 943 | do_ident (cpp_reader *pfile) |
7f2935c7 | 944 | { |
4ed5bcfb | 945 | const cpp_token *str = cpp_get_token (pfile); |
58fea6af | 946 | |
4ed5bcfb | 947 | if (str->type != CPP_STRING) |
ebef4e8c | 948 | cpp_error (pfile, DL_ERROR, "invalid #ident directive"); |
93c80368 | 949 | else if (pfile->cb.ident) |
6cf87ca4 | 950 | pfile->cb.ident (pfile, pfile->directive_line, &str->val.str); |
a2a76ce7 | 951 | |
93c80368 | 952 | check_eol (pfile); |
7f2935c7 PB |
953 | } |
954 | ||
a5da89c6 NB |
955 | /* Lookup a PRAGMA name in a singly-linked CHAIN. Returns the |
956 | matching entry, or NULL if none is found. The returned entry could | |
957 | be the start of a namespace chain, or a pragma. */ | |
958 | static struct pragma_entry * | |
6cf87ca4 | 959 | lookup_pragma_entry (struct pragma_entry *chain, const cpp_hashnode *pragma) |
82443371 | 960 | { |
4b115ff0 NB |
961 | while (chain && chain->pragma != pragma) |
962 | chain = chain->next; | |
a5da89c6 NB |
963 | |
964 | return chain; | |
965 | } | |
966 | ||
967 | /* Create and insert a pragma entry for NAME at the beginning of a | |
968 | singly-linked CHAIN. If handler is NULL, it is a namespace, | |
969 | otherwise it is a pragma and its handler. */ | |
970 | static struct pragma_entry * | |
6cf87ca4 ZW |
971 | insert_pragma_entry (cpp_reader *pfile, struct pragma_entry **chain, |
972 | const cpp_hashnode *pragma, pragma_cb handler) | |
82443371 | 973 | { |
a5da89c6 | 974 | struct pragma_entry *new; |
58fea6af | 975 | |
bef985f3 | 976 | new = (struct pragma_entry *) |
8c3b2693 | 977 | _cpp_aligned_alloc (pfile, sizeof (struct pragma_entry)); |
4b115ff0 | 978 | new->pragma = pragma; |
a5da89c6 NB |
979 | if (handler) |
980 | { | |
981 | new->is_nspace = 0; | |
982 | new->u.handler = handler; | |
983 | } | |
984 | else | |
985 | { | |
986 | new->is_nspace = 1; | |
987 | new->u.space = NULL; | |
988 | } | |
58fea6af | 989 | |
a5da89c6 NB |
990 | new->next = *chain; |
991 | *chain = new; | |
992 | return new; | |
58fea6af | 993 | } |
82443371 | 994 | |
a5da89c6 NB |
995 | /* Register a pragma NAME in namespace SPACE. If SPACE is null, it |
996 | goes in the global namespace. HANDLER is the handler it will call, | |
997 | which must be non-NULL. */ | |
58fea6af | 998 | void |
6cf87ca4 ZW |
999 | cpp_register_pragma (cpp_reader *pfile, const char *space, const char *name, |
1000 | pragma_cb handler) | |
82443371 | 1001 | { |
a5da89c6 NB |
1002 | struct pragma_entry **chain = &pfile->pragmas; |
1003 | struct pragma_entry *entry; | |
4b115ff0 | 1004 | const cpp_hashnode *node; |
a5da89c6 NB |
1005 | |
1006 | if (!handler) | |
1007 | abort (); | |
58fea6af | 1008 | |
a5da89c6 | 1009 | if (space) |
58fea6af | 1010 | { |
4b115ff0 NB |
1011 | node = cpp_lookup (pfile, U space, strlen (space)); |
1012 | entry = lookup_pragma_entry (*chain, node); | |
a5da89c6 | 1013 | if (!entry) |
4b115ff0 | 1014 | entry = insert_pragma_entry (pfile, chain, node, NULL); |
a5da89c6 NB |
1015 | else if (!entry->is_nspace) |
1016 | goto clash; | |
1017 | chain = &entry->u.space; | |
58fea6af ZW |
1018 | } |
1019 | ||
a5da89c6 | 1020 | /* Check for duplicates. */ |
4b115ff0 NB |
1021 | node = cpp_lookup (pfile, U name, strlen (name)); |
1022 | entry = lookup_pragma_entry (*chain, node); | |
a5da89c6 NB |
1023 | if (entry) |
1024 | { | |
1025 | if (entry->is_nspace) | |
1026 | clash: | |
ebef4e8c | 1027 | cpp_error (pfile, DL_ICE, |
a5da89c6 | 1028 | "registering \"%s\" as both a pragma and a pragma namespace", |
4b115ff0 | 1029 | NODE_NAME (node)); |
a5da89c6 | 1030 | else if (space) |
ebef4e8c NB |
1031 | cpp_error (pfile, DL_ICE, "#pragma %s %s is already registered", |
1032 | space, name); | |
a5da89c6 | 1033 | else |
ebef4e8c | 1034 | cpp_error (pfile, DL_ICE, "#pragma %s is already registered", name); |
a5da89c6 NB |
1035 | } |
1036 | else | |
4b115ff0 | 1037 | insert_pragma_entry (pfile, chain, node, handler); |
58fea6af | 1038 | } |
a5da89c6 NB |
1039 | |
1040 | /* Register the pragmas the preprocessor itself handles. */ | |
58fea6af | 1041 | void |
6cf87ca4 | 1042 | _cpp_init_internal_pragmas (cpp_reader *pfile) |
58fea6af | 1043 | { |
a5da89c6 | 1044 | /* Pragmas in the global namespace. */ |
58fea6af ZW |
1045 | cpp_register_pragma (pfile, 0, "once", do_pragma_once); |
1046 | ||
a5da89c6 | 1047 | /* New GCC-specific pragmas should be put in the GCC namespace. */ |
58fea6af ZW |
1048 | cpp_register_pragma (pfile, "GCC", "poison", do_pragma_poison); |
1049 | cpp_register_pragma (pfile, "GCC", "system_header", do_pragma_system_header); | |
1050 | cpp_register_pragma (pfile, "GCC", "dependency", do_pragma_dependency); | |
82443371 | 1051 | } |
7f2935c7 | 1052 | |
17211ab5 GK |
1053 | /* Return the number of registered pragmas in PE. */ |
1054 | ||
1055 | static int | |
6cf87ca4 | 1056 | count_registered_pragmas (struct pragma_entry *pe) |
17211ab5 GK |
1057 | { |
1058 | int ct = 0; | |
1059 | for (; pe != NULL; pe = pe->next) | |
1060 | { | |
1061 | if (pe->is_nspace) | |
1062 | ct += count_registered_pragmas (pe->u.space); | |
1063 | ct++; | |
1064 | } | |
1065 | return ct; | |
1066 | } | |
1067 | ||
1068 | /* Save into SD the names of the registered pragmas referenced by PE, | |
1069 | and return a pointer to the next free space in SD. */ | |
1070 | ||
1071 | static char ** | |
6cf87ca4 | 1072 | save_registered_pragmas (struct pragma_entry *pe, char **sd) |
17211ab5 GK |
1073 | { |
1074 | for (; pe != NULL; pe = pe->next) | |
1075 | { | |
1076 | if (pe->is_nspace) | |
1077 | sd = save_registered_pragmas (pe->u.space, sd); | |
1078 | *sd++ = xmemdup (HT_STR (&pe->pragma->ident), | |
1079 | HT_LEN (&pe->pragma->ident), | |
1080 | HT_LEN (&pe->pragma->ident) + 1); | |
1081 | } | |
1082 | return sd; | |
1083 | } | |
1084 | ||
1085 | /* Return a newly-allocated array which saves the names of the | |
1086 | registered pragmas. */ | |
1087 | ||
1088 | char ** | |
6cf87ca4 | 1089 | _cpp_save_pragma_names (cpp_reader *pfile) |
17211ab5 GK |
1090 | { |
1091 | int ct = count_registered_pragmas (pfile->pragmas); | |
1092 | char **result = xnewvec (char *, ct); | |
1093 | (void) save_registered_pragmas (pfile->pragmas, result); | |
1094 | return result; | |
1095 | } | |
1096 | ||
1097 | /* Restore from SD the names of the registered pragmas referenced by PE, | |
1098 | and return a pointer to the next unused name in SD. */ | |
1099 | ||
1100 | static char ** | |
6cf87ca4 ZW |
1101 | restore_registered_pragmas (cpp_reader *pfile, struct pragma_entry *pe, |
1102 | char **sd) | |
17211ab5 GK |
1103 | { |
1104 | for (; pe != NULL; pe = pe->next) | |
1105 | { | |
1106 | if (pe->is_nspace) | |
1107 | sd = restore_registered_pragmas (pfile, pe->u.space, sd); | |
1108 | pe->pragma = cpp_lookup (pfile, U *sd, strlen (*sd)); | |
1109 | free (*sd); | |
1110 | sd++; | |
1111 | } | |
1112 | return sd; | |
1113 | } | |
1114 | ||
1115 | /* Restore the names of the registered pragmas from SAVED. */ | |
1116 | ||
1117 | void | |
6cf87ca4 | 1118 | _cpp_restore_pragma_names (cpp_reader *pfile, char **saved) |
17211ab5 GK |
1119 | { |
1120 | (void) restore_registered_pragmas (pfile, pfile->pragmas, saved); | |
1121 | free (saved); | |
1122 | } | |
1123 | ||
a5da89c6 NB |
1124 | /* Pragmata handling. We handle some, and pass the rest on to the |
1125 | front end. C99 defines three pragmas and says that no macro | |
1126 | expansion is to be performed on them; whether or not macro | |
1127 | expansion happens for other pragmas is implementation defined. | |
1128 | This implementation never macro-expands the text after #pragma. */ | |
711b8824 | 1129 | static void |
6cf87ca4 | 1130 | do_pragma (cpp_reader *pfile) |
7f2935c7 | 1131 | { |
a5da89c6 | 1132 | const struct pragma_entry *p = NULL; |
4ed5bcfb | 1133 | const cpp_token *token; |
a5da89c6 | 1134 | unsigned int count = 1; |
add7091b | 1135 | |
93c80368 | 1136 | pfile->state.prevent_expansion++; |
58fea6af | 1137 | |
4ed5bcfb NB |
1138 | token = cpp_get_token (pfile); |
1139 | if (token->type == CPP_NAME) | |
0172e2bc | 1140 | { |
4b115ff0 | 1141 | p = lookup_pragma_entry (pfile->pragmas, token->val.node); |
a5da89c6 | 1142 | if (p && p->is_nspace) |
58fea6af | 1143 | { |
a5da89c6 NB |
1144 | count = 2; |
1145 | token = cpp_get_token (pfile); | |
1146 | if (token->type == CPP_NAME) | |
4b115ff0 | 1147 | p = lookup_pragma_entry (p->u.space, token->val.node); |
a5da89c6 NB |
1148 | else |
1149 | p = NULL; | |
58fea6af | 1150 | } |
58fea6af | 1151 | } |
041c3194 | 1152 | |
97293897 NB |
1153 | /* FIXME. This is an awful kludge to get the front ends to update |
1154 | their notion of line number for diagnostic purposes. The line | |
1155 | number should be passed to the handler and they should do it | |
1156 | themselves. Stand-alone CPP must ignore us, otherwise it will | |
1157 | prefix the directive with spaces, hence the 1. Ugh. */ | |
1158 | if (pfile->cb.line_change) | |
6cf87ca4 | 1159 | pfile->cb.line_change (pfile, token, 1); |
97293897 | 1160 | |
a5da89c6 | 1161 | if (p) |
6cf87ca4 | 1162 | p->u.handler (pfile); |
d82fc108 | 1163 | else if (pfile->cb.def_pragma) |
bdcbe496 NB |
1164 | { |
1165 | _cpp_backup_tokens (pfile, count); | |
6cf87ca4 | 1166 | pfile->cb.def_pragma (pfile, pfile->directive_line); |
bdcbe496 | 1167 | } |
a5da89c6 | 1168 | |
97293897 | 1169 | pfile->state.prevent_expansion--; |
82443371 NS |
1170 | } |
1171 | ||
5d8ebbd8 | 1172 | /* Handle #pragma once. */ |
58fea6af | 1173 | static void |
6cf87ca4 | 1174 | do_pragma_once (cpp_reader *pfile) |
a2a76ce7 | 1175 | { |
9fbd3e41 JM |
1176 | if (CPP_OPTION (pfile, warn_deprecated)) |
1177 | cpp_error (pfile, DL_WARNING, "#pragma once is obsolete"); | |
df383483 | 1178 | |
642ce434 | 1179 | if (pfile->buffer->prev == NULL) |
ebef4e8c | 1180 | cpp_error (pfile, DL_WARNING, "#pragma once in main file"); |
a2a76ce7 | 1181 | else |
642ce434 | 1182 | _cpp_never_reread (pfile->buffer->inc); |
93c80368 NB |
1183 | |
1184 | check_eol (pfile); | |
a2a76ce7 | 1185 | } |
fc009f96 | 1186 | |
c3bf3e6e NB |
1187 | /* Handle #pragma GCC poison, to poison one or more identifiers so |
1188 | that the lexer produces a hard error for each subsequent usage. */ | |
58fea6af | 1189 | static void |
6cf87ca4 | 1190 | do_pragma_poison (cpp_reader *pfile) |
a2a76ce7 | 1191 | { |
345894b4 | 1192 | const cpp_token *tok; |
f8f769ea | 1193 | cpp_hashnode *hp; |
a2a76ce7 | 1194 | |
93c80368 | 1195 | pfile->state.poisoned_ok = 1; |
a2a76ce7 ZW |
1196 | for (;;) |
1197 | { | |
345894b4 NB |
1198 | tok = _cpp_lex_token (pfile); |
1199 | if (tok->type == CPP_EOF) | |
a2a76ce7 | 1200 | break; |
345894b4 | 1201 | if (tok->type != CPP_NAME) |
fc009f96 | 1202 | { |
ebef4e8c | 1203 | cpp_error (pfile, DL_ERROR, "invalid #pragma GCC poison directive"); |
93c80368 | 1204 | break; |
fc009f96 GK |
1205 | } |
1206 | ||
345894b4 | 1207 | hp = tok->val.node; |
93c80368 NB |
1208 | if (hp->flags & NODE_POISONED) |
1209 | continue; | |
1210 | ||
1211 | if (hp->type == NT_MACRO) | |
ebef4e8c NB |
1212 | cpp_error (pfile, DL_WARNING, "poisoning existing macro \"%s\"", |
1213 | NODE_NAME (hp)); | |
93c80368 NB |
1214 | _cpp_free_definition (hp); |
1215 | hp->flags |= NODE_POISONED | NODE_DIAGNOSTIC; | |
fc009f96 | 1216 | } |
93c80368 | 1217 | pfile->state.poisoned_ok = 0; |
7f2935c7 | 1218 | } |
2c0b35cb ZW |
1219 | |
1220 | /* Mark the current header as a system header. This will suppress | |
1221 | some categories of warnings (notably those from -pedantic). It is | |
1222 | intended for use in system libraries that cannot be implemented in | |
1223 | conforming C, but cannot be certain that their headers appear in a | |
1224 | system include directory. To prevent abuse, it is rejected in the | |
1225 | primary source file. */ | |
58fea6af | 1226 | static void |
6cf87ca4 | 1227 | do_pragma_system_header (cpp_reader *pfile) |
2c0b35cb | 1228 | { |
614c7d37 NB |
1229 | cpp_buffer *buffer = pfile->buffer; |
1230 | ||
1231 | if (buffer->prev == 0) | |
ebef4e8c NB |
1232 | cpp_error (pfile, DL_WARNING, |
1233 | "#pragma system_header ignored outside include file"); | |
2c0b35cb | 1234 | else |
d82fc108 NB |
1235 | { |
1236 | check_eol (pfile); | |
bdcbe496 | 1237 | skip_rest_of_line (pfile); |
d82fc108 NB |
1238 | cpp_make_system_header (pfile, 1, 0); |
1239 | } | |
2c0b35cb | 1240 | } |
f3f751ad NS |
1241 | |
1242 | /* Check the modified date of the current include file against a specified | |
1243 | file. Issue a diagnostic, if the specified file is newer. We use this to | |
1244 | determine if a fixed header should be refixed. */ | |
58fea6af | 1245 | static void |
6cf87ca4 | 1246 | do_pragma_dependency (cpp_reader *pfile) |
f3f751ad | 1247 | { |
74eb4b3e NB |
1248 | const char *fname; |
1249 | int angle_brackets, ordering; | |
df383483 | 1250 | |
74eb4b3e NB |
1251 | fname = parse_include (pfile, &angle_brackets); |
1252 | if (!fname) | |
58fea6af | 1253 | return; |
041c3194 | 1254 | |
74eb4b3e | 1255 | ordering = _cpp_compare_file_date (pfile, fname, angle_brackets); |
f3f751ad | 1256 | if (ordering < 0) |
74eb4b3e | 1257 | cpp_error (pfile, DL_WARNING, "cannot find source file %s", fname); |
f3f751ad NS |
1258 | else if (ordering > 0) |
1259 | { | |
74eb4b3e | 1260 | cpp_error (pfile, DL_WARNING, "current file is older than %s", fname); |
4ed5bcfb | 1261 | if (cpp_get_token (pfile)->type != CPP_EOF) |
bdcbe496 NB |
1262 | { |
1263 | _cpp_backup_tokens (pfile, 1); | |
ebef4e8c | 1264 | do_diagnostic (pfile, DL_WARNING, 0); |
bdcbe496 | 1265 | } |
f3f751ad | 1266 | } |
74eb4b3e | 1267 | |
fad205ff | 1268 | free ((void *) fname); |
f3f751ad NS |
1269 | } |
1270 | ||
4ed5bcfb NB |
1271 | /* Get a token but skip padding. */ |
1272 | static const cpp_token * | |
6cf87ca4 | 1273 | get_token_no_padding (cpp_reader *pfile) |
a5c3cccd | 1274 | { |
4ed5bcfb NB |
1275 | for (;;) |
1276 | { | |
1277 | const cpp_token *result = cpp_get_token (pfile); | |
1278 | if (result->type != CPP_PADDING) | |
1279 | return result; | |
1280 | } | |
1281 | } | |
a5c3cccd | 1282 | |
4ed5bcfb NB |
1283 | /* Check syntax is "(string-literal)". Returns the string on success, |
1284 | or NULL on failure. */ | |
1285 | static const cpp_token * | |
6cf87ca4 | 1286 | get__Pragma_string (cpp_reader *pfile) |
4ed5bcfb NB |
1287 | { |
1288 | const cpp_token *string; | |
a5c3cccd | 1289 | |
4ed5bcfb NB |
1290 | if (get_token_no_padding (pfile)->type != CPP_OPEN_PAREN) |
1291 | return NULL; | |
1292 | ||
1293 | string = get_token_no_padding (pfile); | |
a5c3cccd | 1294 | if (string->type != CPP_STRING && string->type != CPP_WSTRING) |
4ed5bcfb NB |
1295 | return NULL; |
1296 | ||
1297 | if (get_token_no_padding (pfile)->type != CPP_CLOSE_PAREN) | |
1298 | return NULL; | |
a5c3cccd | 1299 | |
4ed5bcfb | 1300 | return string; |
a5c3cccd NB |
1301 | } |
1302 | ||
87062813 NB |
1303 | /* Destringize IN into a temporary buffer, by removing the first \ of |
1304 | \" and \\ sequences, and process the result as a #pragma directive. */ | |
1305 | static void | |
6cf87ca4 | 1306 | destringize_and_run (cpp_reader *pfile, const cpp_string *in) |
a5c3cccd NB |
1307 | { |
1308 | const unsigned char *src, *limit; | |
87062813 | 1309 | char *dest, *result; |
a5c3cccd | 1310 | |
6338b358 NB |
1311 | dest = result = alloca (in->len - 1); |
1312 | src = in->text + 1 + (in->text[0] == 'L'); | |
1313 | limit = in->text + in->len - 1; | |
1314 | while (src < limit) | |
a5c3cccd NB |
1315 | { |
1316 | /* We know there is a character following the backslash. */ | |
1317 | if (*src == '\\' && (src[1] == '\\' || src[1] == '"')) | |
1318 | src++; | |
1319 | *dest++ = *src++; | |
1320 | } | |
26aea073 | 1321 | *dest = '\n'; |
a5c3cccd | 1322 | |
8128cccf NB |
1323 | /* Ugh; an awful kludge. We are really not set up to be lexing |
1324 | tokens when in the middle of a macro expansion. Use a new | |
1325 | context to force cpp_get_token to lex, and so skip_rest_of_line | |
1326 | doesn't go beyond the end of the text. Also, remember the | |
1327 | current lexing position so we can return to it later. | |
1328 | ||
1329 | Something like line-at-a-time lexing should remove the need for | |
1330 | this. */ | |
1331 | { | |
1332 | cpp_context *saved_context = pfile->context; | |
1333 | cpp_token *saved_cur_token = pfile->cur_token; | |
1334 | tokenrun *saved_cur_run = pfile->cur_run; | |
1335 | ||
1336 | pfile->context = xnew (cpp_context); | |
1337 | pfile->context->macro = 0; | |
1338 | pfile->context->prev = 0; | |
1339 | run_directive (pfile, T_PRAGMA, result, dest - result); | |
1340 | free (pfile->context); | |
1341 | pfile->context = saved_context; | |
1342 | pfile->cur_token = saved_cur_token; | |
1343 | pfile->cur_run = saved_cur_run; | |
1344 | pfile->line--; | |
1345 | } | |
79ba5e3b NB |
1346 | |
1347 | /* See above comment. For the moment, we'd like | |
1348 | ||
1349 | token1 _Pragma ("foo") token2 | |
1350 | ||
1351 | to be output as | |
1352 | ||
1353 | token1 | |
1354 | # 7 "file.c" | |
1355 | #pragma foo | |
1356 | # 7 "file.c" | |
1357 | token2 | |
1358 | ||
1359 | Getting the line markers is a little tricky. */ | |
1360 | if (pfile->cb.line_change) | |
6cf87ca4 | 1361 | pfile->cb.line_change (pfile, pfile->cur_token, false); |
a5c3cccd NB |
1362 | } |
1363 | ||
87062813 | 1364 | /* Handle the _Pragma operator. */ |
a5c3cccd | 1365 | void |
6cf87ca4 | 1366 | _cpp_do__Pragma (cpp_reader *pfile) |
a5c3cccd | 1367 | { |
4ed5bcfb | 1368 | const cpp_token *string = get__Pragma_string (pfile); |
a5c3cccd | 1369 | |
79ba5e3b NB |
1370 | if (string) |
1371 | destringize_and_run (pfile, &string->val.str); | |
1372 | else | |
ebef4e8c NB |
1373 | cpp_error (pfile, DL_ERROR, |
1374 | "_Pragma takes a parenthesized string literal"); | |
a5c3cccd NB |
1375 | } |
1376 | ||
6cf87ca4 | 1377 | /* Ignore #sccs on all systems. */ |
711b8824 | 1378 | static void |
6cf87ca4 | 1379 | do_sccs (cpp_reader *pfile ATTRIBUTE_UNUSED) |
7f2935c7 | 1380 | { |
7f2935c7 | 1381 | } |
1d0e51ba | 1382 | |
5d8ebbd8 | 1383 | /* Handle #ifdef. */ |
711b8824 | 1384 | static void |
6cf87ca4 | 1385 | do_ifdef (cpp_reader *pfile) |
168d3732 | 1386 | { |
93c80368 | 1387 | int skip = 1; |
041c3194 | 1388 | |
cef0d199 | 1389 | if (! pfile->state.skipping) |
93c80368 NB |
1390 | { |
1391 | const cpp_hashnode *node = lex_macro_node (pfile); | |
041c3194 | 1392 | |
93c80368 | 1393 | if (node) |
a69cbaac NB |
1394 | { |
1395 | skip = node->type != NT_MACRO; | |
1396 | _cpp_mark_macro_used (node); | |
1397 | check_eol (pfile); | |
1398 | } | |
93c80368 | 1399 | } |
168d3732 | 1400 | |
93c80368 NB |
1401 | push_conditional (pfile, skip, T_IFDEF, 0); |
1402 | } | |
168d3732 | 1403 | |
5d8ebbd8 | 1404 | /* Handle #ifndef. */ |
711b8824 | 1405 | static void |
6cf87ca4 | 1406 | do_ifndef (cpp_reader *pfile) |
168d3732 | 1407 | { |
93c80368 | 1408 | int skip = 1; |
bfb9dc7f | 1409 | const cpp_hashnode *node = 0; |
168d3732 | 1410 | |
cef0d199 | 1411 | if (! pfile->state.skipping) |
5af7e2c2 | 1412 | { |
93c80368 | 1413 | node = lex_macro_node (pfile); |
b43db0b3 GK |
1414 | |
1415 | if (node) | |
a69cbaac NB |
1416 | { |
1417 | skip = node->type == NT_MACRO; | |
1418 | _cpp_mark_macro_used (node); | |
1419 | check_eol (pfile); | |
1420 | } | |
5af7e2c2 | 1421 | } |
041c3194 | 1422 | |
93c80368 | 1423 | push_conditional (pfile, skip, T_IFNDEF, node); |
7f2935c7 PB |
1424 | } |
1425 | ||
6d18adbc NB |
1426 | /* _cpp_parse_expr puts a macro in a "#if !defined ()" expression in |
1427 | pfile->mi_ind_cmacro so we can handle multiple-include | |
6356f892 | 1428 | optimizations. If macro expansion occurs in the expression, we |
6d18adbc NB |
1429 | cannot treat it as a controlling conditional, since the expansion |
1430 | could change in the future. That is handled by cpp_get_token. */ | |
711b8824 | 1431 | static void |
6cf87ca4 | 1432 | do_if (cpp_reader *pfile) |
7f2935c7 | 1433 | { |
93c80368 | 1434 | int skip = 1; |
7f2935c7 | 1435 | |
cef0d199 | 1436 | if (! pfile->state.skipping) |
87ed109f | 1437 | skip = _cpp_parse_expr (pfile) == false; |
93c80368 | 1438 | |
6d18adbc | 1439 | push_conditional (pfile, skip, T_IF, pfile->mi_ind_cmacro); |
7f2935c7 PB |
1440 | } |
1441 | ||
b528a07e | 1442 | /* Flip skipping state if appropriate and continue without changing |
ea4a453b ZW |
1443 | if_stack; this is so that the error message for missing #endif's |
1444 | etc. will point to the original #if. */ | |
711b8824 | 1445 | static void |
6cf87ca4 | 1446 | do_else (cpp_reader *pfile) |
ed705a82 | 1447 | { |
b528a07e NB |
1448 | cpp_buffer *buffer = pfile->buffer; |
1449 | struct if_stack *ifs = buffer->if_stack; | |
ff2b53ef | 1450 | |
ea4a453b | 1451 | if (ifs == NULL) |
ebef4e8c | 1452 | cpp_error (pfile, DL_ERROR, "#else without #if"); |
93c80368 | 1453 | else |
ff2b53ef | 1454 | { |
93c80368 NB |
1455 | if (ifs->type == T_ELSE) |
1456 | { | |
ebef4e8c NB |
1457 | cpp_error (pfile, DL_ERROR, "#else after #else"); |
1458 | cpp_error_with_line (pfile, DL_ERROR, ifs->line, 0, | |
93c80368 NB |
1459 | "the conditional began here"); |
1460 | } | |
b528a07e NB |
1461 | ifs->type = T_ELSE; |
1462 | ||
cef0d199 NB |
1463 | /* Skip any future (erroneous) #elses or #elifs. */ |
1464 | pfile->state.skipping = ifs->skip_elses; | |
1465 | ifs->skip_elses = true; | |
7f2935c7 | 1466 | |
93c80368 NB |
1467 | /* Invalidate any controlling macro. */ |
1468 | ifs->mi_cmacro = 0; | |
93c80368 | 1469 | |
cef0d199 | 1470 | /* Only check EOL if was not originally skipping. */ |
909de5da | 1471 | if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels)) |
cef0d199 NB |
1472 | check_eol (pfile); |
1473 | } | |
7f2935c7 PB |
1474 | } |
1475 | ||
5d8ebbd8 | 1476 | /* Handle a #elif directive by not changing if_stack either. See the |
93c80368 | 1477 | comment above do_else. */ |
711b8824 | 1478 | static void |
6cf87ca4 | 1479 | do_elif (cpp_reader *pfile) |
7f2935c7 | 1480 | { |
b528a07e NB |
1481 | cpp_buffer *buffer = pfile->buffer; |
1482 | struct if_stack *ifs = buffer->if_stack; | |
7f2935c7 | 1483 | |
ea4a453b | 1484 | if (ifs == NULL) |
ebef4e8c | 1485 | cpp_error (pfile, DL_ERROR, "#elif without #if"); |
b528a07e | 1486 | else |
40ea76de | 1487 | { |
b528a07e NB |
1488 | if (ifs->type == T_ELSE) |
1489 | { | |
ebef4e8c NB |
1490 | cpp_error (pfile, DL_ERROR, "#elif after #else"); |
1491 | cpp_error_with_line (pfile, DL_ERROR, ifs->line, 0, | |
b528a07e NB |
1492 | "the conditional began here"); |
1493 | } | |
1494 | ifs->type = T_ELIF; | |
93c80368 | 1495 | |
cef0d199 NB |
1496 | /* Only evaluate this if we aren't skipping elses. During |
1497 | evaluation, set skipping to false to get lexer warnings. */ | |
1498 | if (ifs->skip_elses) | |
1499 | pfile->state.skipping = 1; | |
1500 | else | |
b528a07e | 1501 | { |
cef0d199 NB |
1502 | pfile->state.skipping = 0; |
1503 | pfile->state.skipping = ! _cpp_parse_expr (pfile); | |
1504 | ifs->skip_elses = ! pfile->state.skipping; | |
b528a07e | 1505 | } |
cef0d199 NB |
1506 | |
1507 | /* Invalidate any controlling macro. */ | |
1508 | ifs->mi_cmacro = 0; | |
40ea76de | 1509 | } |
7f2935c7 PB |
1510 | } |
1511 | ||
cef0d199 | 1512 | /* #endif pops the if stack and resets pfile->state.skipping. */ |
711b8824 | 1513 | static void |
6cf87ca4 | 1514 | do_endif (cpp_reader *pfile) |
7f2935c7 | 1515 | { |
b528a07e NB |
1516 | cpp_buffer *buffer = pfile->buffer; |
1517 | struct if_stack *ifs = buffer->if_stack; | |
ea4a453b | 1518 | |
ea4a453b | 1519 | if (ifs == NULL) |
ebef4e8c | 1520 | cpp_error (pfile, DL_ERROR, "#endif without #if"); |
7f2935c7 PB |
1521 | else |
1522 | { | |
cef0d199 | 1523 | /* Only check EOL if was not originally skipping. */ |
909de5da | 1524 | if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels)) |
cef0d199 NB |
1525 | check_eol (pfile); |
1526 | ||
93c80368 NB |
1527 | /* If potential control macro, we go back outside again. */ |
1528 | if (ifs->next == 0 && ifs->mi_cmacro) | |
1529 | { | |
6d18adbc | 1530 | pfile->mi_valid = true; |
93c80368 NB |
1531 | pfile->mi_cmacro = ifs->mi_cmacro; |
1532 | } | |
1533 | ||
b528a07e | 1534 | buffer->if_stack = ifs->next; |
cef0d199 | 1535 | pfile->state.skipping = ifs->was_skipping; |
2a967f3d | 1536 | obstack_free (&pfile->buffer_ob, ifs); |
7f2935c7 | 1537 | } |
93c80368 | 1538 | } |
041c3194 | 1539 | |
5d8ebbd8 NB |
1540 | /* Push an if_stack entry for a preprocessor conditional, and set |
1541 | pfile->state.skipping to SKIP. If TYPE indicates the conditional | |
1542 | is #if or #ifndef, CMACRO is a potentially controlling macro, and | |
1543 | we need to check here that we are at the top of the file. */ | |
ea4a453b | 1544 | static void |
6cf87ca4 ZW |
1545 | push_conditional (cpp_reader *pfile, int skip, int type, |
1546 | const cpp_hashnode *cmacro) | |
ea4a453b ZW |
1547 | { |
1548 | struct if_stack *ifs; | |
b528a07e | 1549 | cpp_buffer *buffer = pfile->buffer; |
ea4a453b | 1550 | |
2a967f3d | 1551 | ifs = xobnew (&pfile->buffer_ob, struct if_stack); |
50410426 | 1552 | ifs->line = pfile->directive_line; |
b528a07e | 1553 | ifs->next = buffer->if_stack; |
cef0d199 NB |
1554 | ifs->skip_elses = pfile->state.skipping || !skip; |
1555 | ifs->was_skipping = pfile->state.skipping; | |
ea4a453b | 1556 | ifs->type = type; |
6d18adbc NB |
1557 | /* This condition is effectively a test for top-of-file. */ |
1558 | if (pfile->mi_valid && pfile->mi_cmacro == 0) | |
93c80368 NB |
1559 | ifs->mi_cmacro = cmacro; |
1560 | else | |
1561 | ifs->mi_cmacro = 0; | |
ea4a453b | 1562 | |
cef0d199 | 1563 | pfile->state.skipping = skip; |
b528a07e | 1564 | buffer->if_stack = ifs; |
782331f4 | 1565 | } |
7061aa5a | 1566 | |
5d8ebbd8 NB |
1567 | /* Read the tokens of the answer into the macro pool, in a directive |
1568 | of type TYPE. Only commit the memory if we intend it as permanent | |
1569 | storage, i.e. the #assert case. Returns 0 on success, and sets | |
1570 | ANSWERP to point to the answer. */ | |
93c80368 | 1571 | static int |
6cf87ca4 | 1572 | parse_answer (cpp_reader *pfile, struct answer **answerp, int type) |
7f2935c7 | 1573 | { |
4ed5bcfb | 1574 | const cpp_token *paren; |
93c80368 | 1575 | struct answer *answer; |
8c3b2693 | 1576 | unsigned int acount; |
93c80368 NB |
1577 | |
1578 | /* In a conditional, it is legal to not have an open paren. We | |
1579 | should save the following token in this case. */ | |
4ed5bcfb | 1580 | paren = cpp_get_token (pfile); |
93c80368 NB |
1581 | |
1582 | /* If not a paren, see if we're OK. */ | |
4ed5bcfb | 1583 | if (paren->type != CPP_OPEN_PAREN) |
041c3194 | 1584 | { |
93c80368 NB |
1585 | /* In a conditional no answer is a test for any answer. It |
1586 | could be followed by any token. */ | |
1587 | if (type == T_IF) | |
bdcbe496 NB |
1588 | { |
1589 | _cpp_backup_tokens (pfile, 1); | |
1590 | return 0; | |
1591 | } | |
93c80368 NB |
1592 | |
1593 | /* #unassert with no answer is valid - it removes all answers. */ | |
4ed5bcfb | 1594 | if (type == T_UNASSERT && paren->type == CPP_EOF) |
93c80368 | 1595 | return 0; |
15dad1d9 | 1596 | |
ebef4e8c | 1597 | cpp_error (pfile, DL_ERROR, "missing '(' after predicate"); |
93c80368 | 1598 | return 1; |
041c3194 | 1599 | } |
7061aa5a | 1600 | |
8c3b2693 | 1601 | for (acount = 0;; acount++) |
041c3194 | 1602 | { |
8c3b2693 NB |
1603 | size_t room_needed; |
1604 | const cpp_token *token = cpp_get_token (pfile); | |
1605 | cpp_token *dest; | |
93c80368 | 1606 | |
041c3194 ZW |
1607 | if (token->type == CPP_CLOSE_PAREN) |
1608 | break; | |
a7abcbbf | 1609 | |
93c80368 | 1610 | if (token->type == CPP_EOF) |
041c3194 | 1611 | { |
ebef4e8c | 1612 | cpp_error (pfile, DL_ERROR, "missing ')' to complete answer"); |
93c80368 | 1613 | return 1; |
041c3194 | 1614 | } |
8c3b2693 NB |
1615 | |
1616 | /* struct answer includes the space for one token. */ | |
1617 | room_needed = (sizeof (struct answer) + acount * sizeof (cpp_token)); | |
1618 | ||
1619 | if (BUFF_ROOM (pfile->a_buff) < room_needed) | |
1620 | _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (struct answer)); | |
1621 | ||
1622 | dest = &((struct answer *) BUFF_FRONT (pfile->a_buff))->first[acount]; | |
1623 | *dest = *token; | |
1624 | ||
1625 | /* Drop whitespace at start, for answer equivalence purposes. */ | |
1626 | if (acount == 0) | |
1627 | dest->flags &= ~PREV_WHITE; | |
041c3194 | 1628 | } |
15dad1d9 | 1629 | |
8c3b2693 | 1630 | if (acount == 0) |
7061aa5a | 1631 | { |
ebef4e8c | 1632 | cpp_error (pfile, DL_ERROR, "predicate's answer is empty"); |
93c80368 | 1633 | return 1; |
7f2935c7 | 1634 | } |
041c3194 | 1635 | |
8c3b2693 NB |
1636 | answer = (struct answer *) BUFF_FRONT (pfile->a_buff); |
1637 | answer->count = acount; | |
1638 | answer->next = NULL; | |
93c80368 | 1639 | *answerp = answer; |
041c3194 | 1640 | |
93c80368 NB |
1641 | return 0; |
1642 | } | |
041c3194 | 1643 | |
5d8ebbd8 NB |
1644 | /* Parses an assertion directive of type TYPE, returning a pointer to |
1645 | the hash node of the predicate, or 0 on error. If an answer was | |
1646 | supplied, it is placed in ANSWERP, otherwise it is set to 0. */ | |
93c80368 | 1647 | static cpp_hashnode * |
6cf87ca4 | 1648 | parse_assertion (cpp_reader *pfile, struct answer **answerp, int type) |
93c80368 NB |
1649 | { |
1650 | cpp_hashnode *result = 0; | |
4ed5bcfb | 1651 | const cpp_token *predicate; |
93c80368 NB |
1652 | |
1653 | /* We don't expand predicates or answers. */ | |
1654 | pfile->state.prevent_expansion++; | |
1655 | ||
93c80368 | 1656 | *answerp = 0; |
4ed5bcfb NB |
1657 | predicate = cpp_get_token (pfile); |
1658 | if (predicate->type == CPP_EOF) | |
ebef4e8c | 1659 | cpp_error (pfile, DL_ERROR, "assertion without predicate"); |
4ed5bcfb | 1660 | else if (predicate->type != CPP_NAME) |
ebef4e8c | 1661 | cpp_error (pfile, DL_ERROR, "predicate must be an identifier"); |
93c80368 NB |
1662 | else if (parse_answer (pfile, answerp, type) == 0) |
1663 | { | |
4ed5bcfb | 1664 | unsigned int len = NODE_LEN (predicate->val.node); |
93c80368 | 1665 | unsigned char *sym = alloca (len + 1); |
041c3194 | 1666 | |
93c80368 NB |
1667 | /* Prefix '#' to get it out of macro namespace. */ |
1668 | sym[0] = '#'; | |
4ed5bcfb | 1669 | memcpy (sym + 1, NODE_NAME (predicate->val.node), len); |
93c80368 NB |
1670 | result = cpp_lookup (pfile, sym, len + 1); |
1671 | } | |
7061aa5a | 1672 | |
93c80368 NB |
1673 | pfile->state.prevent_expansion--; |
1674 | return result; | |
7f2935c7 | 1675 | } |
7061aa5a | 1676 | |
5d8ebbd8 | 1677 | /* Returns a pointer to the pointer to CANDIDATE in the answer chain, |
041c3194 | 1678 | or a pointer to NULL if the answer is not in the chain. */ |
93c80368 | 1679 | static struct answer ** |
6cf87ca4 | 1680 | find_answer (cpp_hashnode *node, const struct answer *candidate) |
7f2935c7 | 1681 | { |
93c80368 | 1682 | unsigned int i; |
041c3194 | 1683 | struct answer **result; |
7f2935c7 | 1684 | |
041c3194 | 1685 | for (result = &node->value.answers; *result; result = &(*result)->next) |
93c80368 NB |
1686 | { |
1687 | struct answer *answer = *result; | |
1688 | ||
1689 | if (answer->count == candidate->count) | |
1690 | { | |
1691 | for (i = 0; i < answer->count; i++) | |
1692 | if (! _cpp_equiv_tokens (&answer->first[i], &candidate->first[i])) | |
1693 | break; | |
1694 | ||
1695 | if (i == answer->count) | |
1696 | break; | |
1697 | } | |
1698 | } | |
ff2b53ef | 1699 | |
041c3194 ZW |
1700 | return result; |
1701 | } | |
15dad1d9 | 1702 | |
93c80368 | 1703 | /* Test an assertion within a preprocessor conditional. Returns |
da7d8304 | 1704 | nonzero on failure, zero on success. On success, the result of |
2402645b | 1705 | the test is written into VALUE, otherwise the value 0. */ |
93c80368 | 1706 | int |
6cf87ca4 | 1707 | _cpp_test_assertion (cpp_reader *pfile, unsigned int *value) |
93c80368 NB |
1708 | { |
1709 | struct answer *answer; | |
1710 | cpp_hashnode *node; | |
1711 | ||
1712 | node = parse_assertion (pfile, &answer, T_IF); | |
2402645b HPN |
1713 | |
1714 | /* For recovery, an erroneous assertion expression is handled as a | |
1715 | failing assertion. */ | |
1716 | *value = 0; | |
1717 | ||
93c80368 NB |
1718 | if (node) |
1719 | *value = (node->type == NT_ASSERTION && | |
1720 | (answer == 0 || *find_answer (node, answer) != 0)); | |
91318908 NB |
1721 | else if (pfile->cur_token[-1].type == CPP_EOF) |
1722 | _cpp_backup_tokens (pfile, 1); | |
93c80368 NB |
1723 | |
1724 | /* We don't commit the memory for the answer - it's temporary only. */ | |
1725 | return node == 0; | |
1726 | } | |
1727 | ||
5d8ebbd8 | 1728 | /* Handle #assert. */ |
711b8824 | 1729 | static void |
6cf87ca4 | 1730 | do_assert (cpp_reader *pfile) |
041c3194 ZW |
1731 | { |
1732 | struct answer *new_answer; | |
1733 | cpp_hashnode *node; | |
df383483 | 1734 | |
93c80368 | 1735 | node = parse_assertion (pfile, &new_answer, T_ASSERT); |
041c3194 | 1736 | if (node) |
ff2b53ef | 1737 | { |
93c80368 NB |
1738 | /* Place the new answer in the answer list. First check there |
1739 | is not a duplicate. */ | |
041c3194 | 1740 | new_answer->next = 0; |
93c80368 | 1741 | if (node->type == NT_ASSERTION) |
041c3194 | 1742 | { |
93c80368 NB |
1743 | if (*find_answer (node, new_answer)) |
1744 | { | |
ebef4e8c NB |
1745 | cpp_error (pfile, DL_WARNING, "\"%s\" re-asserted", |
1746 | NODE_NAME (node) + 1); | |
93c80368 NB |
1747 | return; |
1748 | } | |
041c3194 ZW |
1749 | new_answer->next = node->value.answers; |
1750 | } | |
8c3b2693 | 1751 | |
93c80368 | 1752 | node->type = NT_ASSERTION; |
041c3194 | 1753 | node->value.answers = new_answer; |
8c3b2693 NB |
1754 | BUFF_FRONT (pfile->a_buff) += (sizeof (struct answer) |
1755 | + (new_answer->count - 1) | |
1756 | * sizeof (cpp_token)); | |
1757 | check_eol (pfile); | |
ff2b53ef | 1758 | } |
041c3194 | 1759 | } |
15dad1d9 | 1760 | |
5d8ebbd8 | 1761 | /* Handle #unassert. */ |
711b8824 | 1762 | static void |
6cf87ca4 | 1763 | do_unassert (cpp_reader *pfile) |
041c3194 ZW |
1764 | { |
1765 | cpp_hashnode *node; | |
93c80368 | 1766 | struct answer *answer; |
df383483 | 1767 | |
93c80368 NB |
1768 | node = parse_assertion (pfile, &answer, T_UNASSERT); |
1769 | /* It isn't an error to #unassert something that isn't asserted. */ | |
1770 | if (node && node->type == NT_ASSERTION) | |
7061aa5a | 1771 | { |
93c80368 | 1772 | if (answer) |
15dad1d9 | 1773 | { |
93c80368 | 1774 | struct answer **p = find_answer (node, answer), *temp; |
041c3194 | 1775 | |
93c80368 NB |
1776 | /* Remove the answer from the list. */ |
1777 | temp = *p; | |
1778 | if (temp) | |
1779 | *p = temp->next; | |
a7abcbbf | 1780 | |
93c80368 NB |
1781 | /* Did we free the last answer? */ |
1782 | if (node->value.answers == 0) | |
1783 | node->type = NT_VOID; | |
8c3b2693 NB |
1784 | |
1785 | check_eol (pfile); | |
93c80368 NB |
1786 | } |
1787 | else | |
1788 | _cpp_free_definition (node); | |
041c3194 | 1789 | } |
93c80368 NB |
1790 | |
1791 | /* We don't commit the memory for the answer - it's temporary only. */ | |
7f2935c7 | 1792 | } |
7f2935c7 | 1793 | |
45b966db ZW |
1794 | /* These are for -D, -U, -A. */ |
1795 | ||
1796 | /* Process the string STR as if it appeared as the body of a #define. | |
1797 | If STR is just an identifier, define it with value 1. | |
1798 | If STR has anything after the identifier, then it should | |
ec5c56db | 1799 | be identifier=definition. */ |
0b22d65c | 1800 | void |
6cf87ca4 | 1801 | cpp_define (cpp_reader *pfile, const char *str) |
0b22d65c | 1802 | { |
45b966db ZW |
1803 | char *buf, *p; |
1804 | size_t count; | |
1805 | ||
df383483 | 1806 | /* Copy the entire option so we can modify it. |
45b966db | 1807 | Change the first "=" in the string to a space. If there is none, |
86368122 NB |
1808 | tack " 1" on the end. */ |
1809 | ||
86368122 | 1810 | count = strlen (str); |
4d6baafa | 1811 | buf = (char *) alloca (count + 3); |
86368122 NB |
1812 | memcpy (buf, str, count); |
1813 | ||
1814 | p = strchr (str, '='); | |
45b966db | 1815 | if (p) |
86368122 | 1816 | buf[p - str] = ' '; |
45b966db ZW |
1817 | else |
1818 | { | |
86368122 NB |
1819 | buf[count++] = ' '; |
1820 | buf[count++] = '1'; | |
0b22d65c | 1821 | } |
26aea073 | 1822 | buf[count] = '\n'; |
cf4ed945 | 1823 | |
29401c30 | 1824 | run_directive (pfile, T_DEFINE, buf, count); |
2c8f0515 ZW |
1825 | } |
1826 | ||
ad2a084d | 1827 | /* Slight variant of the above for use by initialize_builtins. */ |
2c8f0515 | 1828 | void |
6cf87ca4 | 1829 | _cpp_define_builtin (cpp_reader *pfile, const char *str) |
2c8f0515 | 1830 | { |
26aea073 NB |
1831 | size_t len = strlen (str); |
1832 | char *buf = alloca (len + 1); | |
1833 | memcpy (buf, str, len); | |
1834 | buf[len] = '\n'; | |
1835 | run_directive (pfile, T_DEFINE, buf, len); | |
45b966db | 1836 | } |
0f41302f | 1837 | |
45b966db ZW |
1838 | /* Process MACRO as if it appeared as the body of an #undef. */ |
1839 | void | |
6cf87ca4 | 1840 | cpp_undef (cpp_reader *pfile, const char *macro) |
7f2935c7 | 1841 | { |
26aea073 NB |
1842 | size_t len = strlen (macro); |
1843 | char *buf = alloca (len + 1); | |
1844 | memcpy (buf, macro, len); | |
1845 | buf[len] = '\n'; | |
1846 | run_directive (pfile, T_UNDEF, buf, len); | |
7f2935c7 PB |
1847 | } |
1848 | ||
ec5c56db | 1849 | /* Process the string STR as if it appeared as the body of a #assert. */ |
45b966db | 1850 | void |
6cf87ca4 | 1851 | cpp_assert (cpp_reader *pfile, const char *str) |
45b966db | 1852 | { |
86368122 | 1853 | handle_assertion (pfile, str, T_ASSERT); |
45b966db | 1854 | } |
7f2935c7 | 1855 | |
ec5c56db | 1856 | /* Process STR as if it appeared as the body of an #unassert. */ |
45b966db | 1857 | void |
6cf87ca4 | 1858 | cpp_unassert (cpp_reader *pfile, const char *str) |
7f2935c7 | 1859 | { |
86368122 | 1860 | handle_assertion (pfile, str, T_UNASSERT); |
df383483 | 1861 | } |
3fdc651f | 1862 | |
86368122 NB |
1863 | /* Common code for cpp_assert (-A) and cpp_unassert (-A-). */ |
1864 | static void | |
6cf87ca4 | 1865 | handle_assertion (cpp_reader *pfile, const char *str, int type) |
86368122 NB |
1866 | { |
1867 | size_t count = strlen (str); | |
1868 | const char *p = strchr (str, '='); | |
1869 | ||
26aea073 NB |
1870 | /* Copy the entire option so we can modify it. Change the first |
1871 | "=" in the string to a '(', and tack a ')' on the end. */ | |
1872 | char *buf = (char *) alloca (count + 2); | |
1873 | ||
1874 | memcpy (buf, str, count); | |
86368122 NB |
1875 | if (p) |
1876 | { | |
86368122 NB |
1877 | buf[p - str] = '('; |
1878 | buf[count++] = ')'; | |
86368122 | 1879 | } |
26aea073 NB |
1880 | buf[count] = '\n'; |
1881 | str = buf; | |
86368122 | 1882 | |
29401c30 | 1883 | run_directive (pfile, type, str, count); |
86368122 NB |
1884 | } |
1885 | ||
7e96d768 NB |
1886 | /* The number of errors for a given reader. */ |
1887 | unsigned int | |
6cf87ca4 | 1888 | cpp_errors (cpp_reader *pfile) |
7e96d768 NB |
1889 | { |
1890 | return pfile->errors; | |
1891 | } | |
1892 | ||
1893 | /* The options structure. */ | |
1894 | cpp_options * | |
6cf87ca4 | 1895 | cpp_get_options (cpp_reader *pfile) |
7e96d768 NB |
1896 | { |
1897 | return &pfile->opts; | |
1898 | } | |
1899 | ||
1900 | /* The callbacks structure. */ | |
1901 | cpp_callbacks * | |
6cf87ca4 | 1902 | cpp_get_callbacks (cpp_reader *pfile) |
7e96d768 NB |
1903 | { |
1904 | return &pfile->cb; | |
1905 | } | |
1906 | ||
d82fc108 | 1907 | /* The line map set. */ |
47d89cf3 | 1908 | const struct line_maps * |
6cf87ca4 | 1909 | cpp_get_line_maps (cpp_reader *pfile) |
d82fc108 NB |
1910 | { |
1911 | return &pfile->line_maps; | |
1912 | } | |
1913 | ||
7e96d768 NB |
1914 | /* Copy the given callbacks structure to our own. */ |
1915 | void | |
6cf87ca4 | 1916 | cpp_set_callbacks (cpp_reader *pfile, cpp_callbacks *cb) |
7e96d768 NB |
1917 | { |
1918 | pfile->cb = *cb; | |
1919 | } | |
1920 | ||
eb1f4d9d NB |
1921 | /* Push a new buffer on the buffer stack. Returns the new buffer; it |
1922 | doesn't fail. It does not generate a file change call back; that | |
1923 | is the responsibility of the caller. */ | |
c71f835b | 1924 | cpp_buffer * |
6cf87ca4 ZW |
1925 | cpp_push_buffer (cpp_reader *pfile, const uchar *buffer, size_t len, |
1926 | int from_stage3, int return_at_eof) | |
c71f835b | 1927 | { |
2a967f3d | 1928 | cpp_buffer *new = xobnew (&pfile->buffer_ob, cpp_buffer); |
93c80368 | 1929 | |
fde84349 NB |
1930 | /* Clears, amongst other things, if_stack and mi_cmacro. */ |
1931 | memset (new, 0, sizeof (cpp_buffer)); | |
1932 | ||
26aea073 | 1933 | new->next_line = new->buf = buffer; |
fde84349 | 1934 | new->rlimit = buffer + len; |
26aea073 | 1935 | new->from_stage3 = from_stage3; |
3cf3593f | 1936 | new->prev = pfile->buffer; |
ef6e958a | 1937 | new->return_at_eof = return_at_eof; |
26aea073 | 1938 | new->need_line = true; |
0bda4760 | 1939 | |
3cf3593f | 1940 | pfile->buffer = new; |
c71f835b ZW |
1941 | return new; |
1942 | } | |
1943 | ||
af0d16cd NB |
1944 | /* Pops a single buffer, with a file change call-back if appropriate. |
1945 | Then pushes the next -include file, if any remain. */ | |
ef6e958a | 1946 | void |
6cf87ca4 | 1947 | _cpp_pop_buffer (cpp_reader *pfile) |
c71f835b | 1948 | { |
fde84349 | 1949 | cpp_buffer *buffer = pfile->buffer; |
af0d16cd | 1950 | struct include_file *inc = buffer->inc; |
ad2a084d | 1951 | struct if_stack *ifs; |
c71f835b | 1952 | |
fde84349 NB |
1953 | /* Walk back up the conditional stack till we reach its level at |
1954 | entry to this file, issuing error messages. */ | |
1955 | for (ifs = buffer->if_stack; ifs; ifs = ifs->next) | |
ebef4e8c | 1956 | cpp_error_with_line (pfile, DL_ERROR, ifs->line, 0, |
fde84349 | 1957 | "unterminated #%s", dtable[ifs->type].name); |
eb1f4d9d | 1958 | |
97293897 | 1959 | /* In case of a missing #endif. */ |
67821e3a | 1960 | pfile->state.skipping = 0; |
29401c30 | 1961 | |
af0d16cd | 1962 | /* _cpp_do_file_change expects pfile->buffer to be the new one. */ |
29401c30 NB |
1963 | pfile->buffer = buffer->prev; |
1964 | ||
26aea073 NB |
1965 | free (buffer->notes); |
1966 | ||
af0d16cd NB |
1967 | /* Free the buffer object now; we may want to push a new buffer |
1968 | in _cpp_push_next_include_file. */ | |
1969 | obstack_free (&pfile->buffer_ob, buffer); | |
29401c30 | 1970 | |
af0d16cd NB |
1971 | if (inc) |
1972 | { | |
1973 | _cpp_pop_file_buffer (pfile, inc); | |
1974 | ||
1975 | /* Don't generate a callback for popping the main file. */ | |
1976 | if (pfile->buffer) | |
23345bbb | 1977 | _cpp_do_file_change (pfile, LC_LEAVE, 0, 0, 0); |
af0d16cd | 1978 | } |
c71f835b ZW |
1979 | } |
1980 | ||
05713b80 | 1981 | /* Enter all recognized directives in the hash table. */ |
c71f835b | 1982 | void |
6cf87ca4 | 1983 | _cpp_init_directives (cpp_reader *pfile) |
c71f835b | 1984 | { |
766ee681 | 1985 | unsigned int i; |
93c80368 | 1986 | cpp_hashnode *node; |
bfb9dc7f | 1987 | |
37b8524c | 1988 | for (i = 0; i < (unsigned int) N_DIRECTIVES; i++) |
93c80368 | 1989 | { |
766ee681 | 1990 | node = cpp_lookup (pfile, dtable[i].name, dtable[i].length); |
4977bab6 ZW |
1991 | node->is_directive = 1; |
1992 | node->directive_index = i; | |
93c80368 | 1993 | } |
c71f835b | 1994 | } |