]>
Commit | Line | Data |
---|---|---|
5538ada6 | 1 | /* CPP Library. |
5e7b4e25 | 2 | Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, |
5793b276 | 3 | 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc. |
5538ada6 ZW |
4 | Contributed by Per Bothner, 1994-95. |
5 | Based on CCCP program by Paul Rubin, June 1986 | |
6 | Adapted to ANSI C, Richard Stallman, Jan 1987 | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by the | |
10 | Free Software Foundation; either version 2, or (at your option) any | |
11 | later version. | |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
5538ada6 ZW |
22 | #include "config.h" |
23 | #include "system.h" | |
4977bab6 ZW |
24 | #include "coretypes.h" |
25 | #include "tm.h" | |
6de1e2a9 ZW |
26 | #include "cpplib.h" |
27 | #include "cpphash.h" | |
49e6c08e | 28 | #include "mkdeps.h" |
88ae23e7 | 29 | |
674c3b40 | 30 | static void init_library PARAMS ((void)); |
17645b15 | 31 | static void mark_named_operators PARAMS ((cpp_reader *)); |
f5e99456 | 32 | static void read_original_filename PARAMS ((cpp_reader *)); |
f4ff5a69 | 33 | static void post_options PARAMS ((cpp_reader *)); |
6de1e2a9 | 34 | |
61d0346d NB |
35 | /* If we have designated initializers (GCC >2.7) these tables can be |
36 | initialized, constant data. Otherwise, they have to be filled in at | |
12cf91fe | 37 | runtime. */ |
61d0346d | 38 | #if HAVE_DESIGNATED_INITIALIZERS |
a9ae4483 | 39 | |
4a58aab6 | 40 | #define init_trigraph_map() /* Nothing. */ |
61d0346d | 41 | #define TRIGRAPH_MAP \ |
562a5c27 | 42 | __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { |
61d0346d | 43 | |
a9ae4483 | 44 | #define END }; |
455d2586 | 45 | #define s(p, v) [p] = v, |
61d0346d | 46 | |
a9ae4483 | 47 | #else |
61d0346d | 48 | |
562a5c27 | 49 | #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \ |
61d0346d NB |
50 | static void init_trigraph_map PARAMS ((void)) { \ |
51 | unsigned char *x = _cpp_trigraph_map; | |
52 | ||
ae79697b | 53 | #define END } |
455d2586 | 54 | #define s(p, v) x[p] = v; |
61d0346d | 55 | |
a9ae4483 | 56 | #endif |
6de1e2a9 | 57 | |
61d0346d NB |
58 | TRIGRAPH_MAP |
59 | s('=', '#') s(')', ']') s('!', '|') | |
60 | s('(', '[') s('\'', '^') s('>', '}') | |
61 | s('/', '\\') s('<', '{') s('-', '~') | |
62 | END | |
63 | ||
a9ae4483 | 64 | #undef s |
455d2586 | 65 | #undef END |
61d0346d | 66 | #undef TRIGRAPH_MAP |
6de1e2a9 | 67 | |
5d8ebbd8 NB |
68 | /* A set of booleans indicating what CPP features each source language |
69 | requires. */ | |
a01eb545 ZW |
70 | struct lang_flags |
71 | { | |
72 | char c99; | |
a01eb545 ZW |
73 | char cplusplus; |
74 | char extended_numbers; | |
58551c23 | 75 | char std; |
a01eb545 ZW |
76 | char cplusplus_comments; |
77 | char digraphs; | |
78 | }; | |
79 | ||
a01eb545 | 80 | static const struct lang_flags lang_defaults[] = |
b1822ccc NB |
81 | { /* c99 c++ xnum std // digr */ |
82 | /* GNUC89 */ { 0, 0, 1, 0, 1, 1 }, | |
83 | /* GNUC99 */ { 1, 0, 1, 0, 1, 1 }, | |
84 | /* STDC89 */ { 0, 0, 0, 1, 0, 0 }, | |
85 | /* STDC94 */ { 0, 0, 0, 1, 0, 1 }, | |
86 | /* STDC99 */ { 1, 0, 1, 1, 1, 1 }, | |
87 | /* GNUCXX */ { 0, 1, 1, 0, 1, 1 }, | |
88 | /* CXX98 */ { 0, 1, 1, 1, 1, 1 }, | |
89 | /* ASM */ { 0, 0, 1, 0, 1, 0 } | |
a01eb545 ZW |
90 | }; |
91 | ||
5d8ebbd8 | 92 | /* Sets internal flags correctly for a given language. */ |
f749a36b NB |
93 | void |
94 | cpp_set_lang (pfile, lang) | |
dd07b884 NB |
95 | cpp_reader *pfile; |
96 | enum c_lang lang; | |
97 | { | |
a01eb545 | 98 | const struct lang_flags *l = &lang_defaults[(int) lang]; |
df383483 | 99 | |
bdb05a7b | 100 | CPP_OPTION (pfile, lang) = lang; |
dd07b884 | 101 | |
a01eb545 | 102 | CPP_OPTION (pfile, c99) = l->c99; |
a01eb545 ZW |
103 | CPP_OPTION (pfile, cplusplus) = l->cplusplus; |
104 | CPP_OPTION (pfile, extended_numbers) = l->extended_numbers; | |
58551c23 NB |
105 | CPP_OPTION (pfile, std) = l->std; |
106 | CPP_OPTION (pfile, trigraphs) = l->std; | |
a01eb545 ZW |
107 | CPP_OPTION (pfile, cplusplus_comments) = l->cplusplus_comments; |
108 | CPP_OPTION (pfile, digraphs) = l->digraphs; | |
dd07b884 NB |
109 | } |
110 | ||
c1bad961 | 111 | /* Initialize library global state. */ |
cf44ea52 | 112 | static void |
674c3b40 | 113 | init_library () |
cf44ea52 | 114 | { |
7ca3d2b1 NB |
115 | static int initialized = 0; |
116 | ||
117 | if (! initialized) | |
118 | { | |
119 | initialized = 1; | |
120 | ||
7ca3d2b1 NB |
121 | /* Set up the trigraph map. This doesn't need to do anything if |
122 | we were compiled with a compiler that supports C99 designated | |
123 | initializers. */ | |
124 | init_trigraph_map (); | |
125 | } | |
cf44ea52 NB |
126 | } |
127 | ||
ec5c56db | 128 | /* Initialize a cpp_reader structure. */ |
cf44ea52 | 129 | cpp_reader * |
b4e46cea | 130 | cpp_create_reader (lang, table) |
dd07b884 | 131 | enum c_lang lang; |
b4e46cea | 132 | hash_table *table; |
6de1e2a9 | 133 | { |
7ca3d2b1 | 134 | cpp_reader *pfile; |
93c80368 | 135 | |
4912a07c | 136 | /* Initialize this instance of the library if it hasn't been already. */ |
674c3b40 | 137 | init_library (); |
7ca3d2b1 NB |
138 | |
139 | pfile = (cpp_reader *) xcalloc (1, sizeof (cpp_reader)); | |
93c80368 | 140 | |
f749a36b | 141 | cpp_set_lang (pfile, lang); |
ae79697b | 142 | CPP_OPTION (pfile, warn_import) = 1; |
a5a49440 | 143 | CPP_OPTION (pfile, warn_multichar) = 1; |
ae79697b | 144 | CPP_OPTION (pfile, discard_comments) = 1; |
477cdac7 | 145 | CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1; |
ae79697b | 146 | CPP_OPTION (pfile, show_column) = 1; |
6ab3e7dd | 147 | CPP_OPTION (pfile, tabstop) = 8; |
be768055 | 148 | CPP_OPTION (pfile, operator_names) = 1; |
a8eb6044 | 149 | CPP_OPTION (pfile, warn_trigraphs) = 2; |
909de5da | 150 | CPP_OPTION (pfile, warn_endif_labels) = 1; |
9fbd3e41 | 151 | CPP_OPTION (pfile, warn_deprecated) = 1; |
f4ff5a69 | 152 | CPP_OPTION (pfile, warn_long_long) = !CPP_OPTION (pfile, c99); |
b1822ccc | 153 | CPP_OPTION (pfile, dollars_in_ident) = 1; |
ae79697b | 154 | |
2443d4e1 NB |
155 | /* Default CPP arithmetic to something sensible for the host for the |
156 | benefit of dumb users like fix-header. */ | |
c9220e3a | 157 | CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long); |
2443d4e1 NB |
158 | CPP_OPTION (pfile, char_precision) = CHAR_BIT; |
159 | CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int); | |
160 | CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int); | |
2a1dc0d8 | 161 | CPP_OPTION (pfile, unsigned_char) = 0; |
44a147ad | 162 | CPP_OPTION (pfile, unsigned_wchar) = 1; |
4268e8bb | 163 | |
4912a07c | 164 | /* Initialize the line map. Start at logical line 1, so we can use |
50410426 | 165 | a line number of zero for special states. */ |
d82fc108 NB |
166 | init_line_maps (&pfile->line_maps); |
167 | ||
4a58aab6 | 168 | /* Initialize lexer state. */ |
93c80368 NB |
169 | pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); |
170 | ||
4ed5bcfb | 171 | /* Set up static tokens. */ |
4ed5bcfb NB |
172 | pfile->avoid_paste.type = CPP_PADDING; |
173 | pfile->avoid_paste.val.source = NULL; | |
174 | pfile->eof.type = CPP_EOF; | |
175 | pfile->eof.flags = 0; | |
93c80368 | 176 | |
5fddcffc NB |
177 | /* Create a token buffer for the lexer. */ |
178 | _cpp_init_tokenrun (&pfile->base_run, 250); | |
179 | pfile->cur_run = &pfile->base_run; | |
180 | pfile->cur_token = pfile->base_run.base; | |
5fddcffc | 181 | |
4912a07c | 182 | /* Initialize the base context. */ |
93c80368 NB |
183 | pfile->context = &pfile->base_context; |
184 | pfile->base_context.macro = 0; | |
185 | pfile->base_context.prev = pfile->base_context.next = 0; | |
186 | ||
8c3b2693 NB |
187 | /* Aligned and unaligned storage. */ |
188 | pfile->a_buff = _cpp_get_buff (pfile, 0); | |
ece54d54 | 189 | pfile->u_buff = _cpp_get_buff (pfile, 0); |
93c80368 | 190 | |
87ed109f NB |
191 | /* The expression parser stack. */ |
192 | _cpp_expand_op_stack (pfile); | |
193 | ||
4912a07c | 194 | /* Initialize the buffer obstack. */ |
2a967f3d NB |
195 | gcc_obstack_init (&pfile->buffer_ob); |
196 | ||
c71f835b | 197 | _cpp_init_includes (pfile); |
cf44ea52 | 198 | |
b4e46cea PB |
199 | _cpp_init_hashtable (pfile, table); |
200 | ||
cf44ea52 | 201 | return pfile; |
f2d5f0cc ZW |
202 | } |
203 | ||
400023a3 | 204 | /* Free resources used by PFILE. Accessing PFILE after this function |
8d9afc4e | 205 | returns leads to undefined behavior. Returns the error count. */ |
76c3e73e | 206 | void |
400023a3 | 207 | cpp_destroy (pfile) |
6de1e2a9 ZW |
208 | cpp_reader *pfile; |
209 | { | |
93c80368 | 210 | cpp_context *context, *contextn; |
50410426 | 211 | tokenrun *run, *runn; |
709e9e50 | 212 | |
87ed109f | 213 | free (pfile->op_stack); |
af0d16cd | 214 | |
38b24ee2 | 215 | while (CPP_BUFFER (pfile) != NULL) |
ef6e958a | 216 | _cpp_pop_buffer (pfile); |
6de1e2a9 | 217 | |
1a76916c NB |
218 | if (pfile->out.base) |
219 | free (pfile->out.base); | |
004cb263 | 220 | |
93c80368 | 221 | if (pfile->macro_buffer) |
4b49c365 AO |
222 | { |
223 | free ((PTR) pfile->macro_buffer); | |
224 | pfile->macro_buffer = NULL; | |
225 | pfile->macro_buffer_len = 0; | |
226 | } | |
93c80368 | 227 | |
f4ff5a69 NB |
228 | if (pfile->deps) |
229 | deps_free (pfile->deps); | |
2a967f3d | 230 | obstack_free (&pfile->buffer_ob, 0); |
49e6c08e | 231 | |
2a967f3d | 232 | _cpp_destroy_hashtable (pfile); |
bfb9dc7f | 233 | _cpp_cleanup_includes (pfile); |
709e9e50 | 234 | |
8c3b2693 | 235 | _cpp_free_buff (pfile->a_buff); |
ece54d54 | 236 | _cpp_free_buff (pfile->u_buff); |
b8af0ca5 | 237 | _cpp_free_buff (pfile->free_buffs); |
93c80368 | 238 | |
50410426 NB |
239 | for (run = &pfile->base_run; run; run = runn) |
240 | { | |
241 | runn = run->next; | |
242 | free (run->base); | |
243 | if (run != &pfile->base_run) | |
244 | free (run); | |
245 | } | |
246 | ||
93c80368 NB |
247 | for (context = pfile->base_context.next; context; context = contextn) |
248 | { | |
249 | contextn = context->next; | |
250 | free (context); | |
251 | } | |
400023a3 | 252 | |
d82fc108 | 253 | free_line_maps (&pfile->line_maps); |
400023a3 | 254 | free (pfile); |
6de1e2a9 ZW |
255 | } |
256 | ||
93c80368 | 257 | /* This structure defines one built-in identifier. A node will be |
f24a153a ZW |
258 | entered in the hash table under the name NAME, with value VALUE. |
259 | ||
260 | There are two tables of these. builtin_array holds all the | |
261 | "builtin" macros: these are handled by builtin_macro() in | |
262 | cppmacro.c. Builtin is somewhat of a misnomer -- the property of | |
263 | interest is that these macros require special code to compute their | |
264 | expansions. The value is a "builtin_type" enumerator. | |
265 | ||
266 | operator_array holds the C++ named operators. These are keywords | |
267 | which act as aliases for punctuators. In C++, they cannot be | |
268 | altered through #define, and #if recognizes them as operators. In | |
269 | C, these are not entered into the hash table at all (but see | |
270 | <iso646.h>). The value is a token-type enumerator. */ | |
a9ae4483 ZW |
271 | struct builtin |
272 | { | |
562a5c27 | 273 | const uchar *name; |
93c80368 | 274 | unsigned short len; |
f24a153a | 275 | unsigned short value; |
a9ae4483 | 276 | }; |
93c80368 | 277 | |
f24a153a | 278 | #define B(n, t) { DSC(n), t } |
a9ae4483 | 279 | static const struct builtin builtin_array[] = |
6de1e2a9 | 280 | { |
93c80368 NB |
281 | B("__TIME__", BT_TIME), |
282 | B("__DATE__", BT_DATE), | |
283 | B("__FILE__", BT_FILE), | |
284 | B("__BASE_FILE__", BT_BASE_FILE), | |
285 | B("__LINE__", BT_SPECLINE), | |
286 | B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL), | |
278c4662 NB |
287 | /* Keep builtins not used for -traditional-cpp at the end, and |
288 | update init_builtins() if any more are added. */ | |
644eddaa | 289 | B("_Pragma", BT_PRAGMA), |
618cdda7 | 290 | B("__STDC__", BT_STDC), |
f24a153a | 291 | }; |
92936ecf | 292 | |
f24a153a ZW |
293 | static const struct builtin operator_array[] = |
294 | { | |
295 | B("and", CPP_AND_AND), | |
296 | B("and_eq", CPP_AND_EQ), | |
297 | B("bitand", CPP_AND), | |
298 | B("bitor", CPP_OR), | |
299 | B("compl", CPP_COMPL), | |
300 | B("not", CPP_NOT), | |
301 | B("not_eq", CPP_NOT_EQ), | |
302 | B("or", CPP_OR_OR), | |
303 | B("or_eq", CPP_OR_EQ), | |
304 | B("xor", CPP_XOR), | |
305 | B("xor_eq", CPP_XOR_EQ) | |
a9ae4483 | 306 | }; |
12cf91fe | 307 | #undef B |
a9ae4483 | 308 | |
17645b15 NB |
309 | /* Mark the C++ named operators in the hash table. */ |
310 | static void | |
311 | mark_named_operators (pfile) | |
312 | cpp_reader *pfile; | |
313 | { | |
314 | const struct builtin *b; | |
315 | ||
316 | for (b = operator_array; | |
317 | b < (operator_array + ARRAY_SIZE (operator_array)); | |
318 | b++) | |
319 | { | |
320 | cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); | |
321 | hp->flags |= NODE_OPERATOR; | |
4977bab6 ZW |
322 | hp->is_directive = 0; |
323 | hp->directive_index = b->value; | |
17645b15 NB |
324 | } |
325 | } | |
326 | ||
c1bad961 | 327 | /* Read the builtins table above and enter them, and language-specific |
6e270179 NB |
328 | macros, into the hash table. HOSTED is true if this is a hosted |
329 | environment. */ | |
c1bad961 | 330 | void |
6e270179 | 331 | cpp_init_builtins (pfile, hosted) |
a9ae4483 | 332 | cpp_reader *pfile; |
6e270179 | 333 | int hosted; |
a9ae4483 | 334 | { |
a9ae4483 | 335 | const struct builtin *b; |
278c4662 | 336 | size_t n = ARRAY_SIZE (builtin_array); |
771c4df3 | 337 | |
278c4662 NB |
338 | if (CPP_OPTION (pfile, traditional)) |
339 | n -= 2; | |
340 | ||
341 | for(b = builtin_array; b < builtin_array + n; b++) | |
6de1e2a9 | 342 | { |
f24a153a ZW |
343 | cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); |
344 | hp->type = NT_MACRO; | |
345 | hp->flags |= NODE_BUILTIN | NODE_WARN; | |
346 | hp->value.builtin = b->value; | |
6de1e2a9 | 347 | } |
c740cee2 NB |
348 | |
349 | if (CPP_OPTION (pfile, cplusplus)) | |
3d90d290 | 350 | _cpp_define_builtin (pfile, "__cplusplus 1"); |
2a1dc0d8 ZW |
351 | else if (CPP_OPTION (pfile, lang) == CLK_ASM) |
352 | _cpp_define_builtin (pfile, "__ASSEMBLER__ 1"); | |
0f7866e7 | 353 | else if (CPP_OPTION (pfile, lang) == CLK_STDC94) |
c740cee2 NB |
354 | _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L"); |
355 | else if (CPP_OPTION (pfile, c99)) | |
356 | _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L"); | |
357 | ||
6e270179 | 358 | if (hosted) |
58b5b894 | 359 | _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1"); |
6e270179 | 360 | else |
58b5b894 | 361 | _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0"); |
6e270179 | 362 | |
0f7866e7 ZL |
363 | if (CPP_OPTION (pfile, objc)) |
364 | _cpp_define_builtin (pfile, "__OBJC__ 1"); | |
4a58aab6 NB |
365 | } |
366 | ||
2443d4e1 NB |
367 | /* Sanity-checks are dependent on command-line options, so it is |
368 | called as a subroutine of cpp_read_main_file (). */ | |
369 | #if ENABLE_CHECKING | |
370 | static void sanity_checks PARAMS ((cpp_reader *)); | |
371 | static void sanity_checks (pfile) | |
372 | cpp_reader *pfile; | |
373 | { | |
374 | cppchar_t test = 0; | |
c9220e3a | 375 | size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part); |
2443d4e1 NB |
376 | |
377 | /* Sanity checks for assumptions about CPP arithmetic and target | |
378 | type precisions made by cpplib. */ | |
379 | test--; | |
380 | if (test < 1) | |
bdee42b1 | 381 | cpp_error (pfile, DL_ICE, "cppchar_t must be an unsigned type"); |
2443d4e1 | 382 | |
c9220e3a | 383 | if (CPP_OPTION (pfile, precision) > max_precision) |
bdee42b1 | 384 | cpp_error (pfile, DL_ICE, |
68bd6dd6 | 385 | "preprocessor arithmetic has maximum precision of %lu bits; target requires %lu bits", |
c9220e3a NB |
386 | (unsigned long) max_precision, |
387 | (unsigned long) CPP_OPTION (pfile, precision)); | |
2443d4e1 NB |
388 | |
389 | if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision)) | |
bdee42b1 | 390 | cpp_error (pfile, DL_ICE, |
2443d4e1 NB |
391 | "CPP arithmetic must be at least as precise as a target int"); |
392 | ||
393 | if (CPP_OPTION (pfile, char_precision) < 8) | |
bdee42b1 | 394 | cpp_error (pfile, DL_ICE, "target char is less than 8 bits wide"); |
2443d4e1 NB |
395 | |
396 | if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision)) | |
bdee42b1 | 397 | cpp_error (pfile, DL_ICE, |
2443d4e1 NB |
398 | "target wchar_t is narrower than target char"); |
399 | ||
400 | if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision)) | |
bdee42b1 | 401 | cpp_error (pfile, DL_ICE, |
2443d4e1 NB |
402 | "target int is narrower than target char"); |
403 | ||
c9220e3a NB |
404 | /* This is assumed in eval_token() and could be fixed if necessary. */ |
405 | if (sizeof (cppchar_t) > sizeof (cpp_num_part)) | |
406 | cpp_error (pfile, DL_ICE, "CPP half-integer narrower than CPP character"); | |
407 | ||
2443d4e1 | 408 | if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T) |
bdee42b1 | 409 | cpp_error (pfile, DL_ICE, |
68bd6dd6 | 410 | "CPP on this host cannot handle wide character constants over %lu bits, but the target requires %lu bits", |
c9220e3a NB |
411 | (unsigned long) BITS_PER_CPPCHAR_T, |
412 | (unsigned long) CPP_OPTION (pfile, wchar_precision)); | |
2443d4e1 NB |
413 | } |
414 | #else | |
415 | # define sanity_checks(PFILE) | |
416 | #endif | |
417 | ||
76c3e73e NB |
418 | /* Add a dependency target. Can be called any number of times before |
419 | cpp_read_main_file(). If no targets have been added before | |
420 | cpp_read_main_file(), then the default target is used. */ | |
421 | void | |
422 | cpp_add_dependency_target (pfile, target, quote) | |
423 | cpp_reader *pfile; | |
424 | const char *target; | |
425 | int quote; | |
426 | { | |
427 | if (!pfile->deps) | |
428 | pfile->deps = deps_init (); | |
429 | ||
430 | deps_add_target (pfile->deps, target, quote); | |
431 | } | |
432 | ||
f5e99456 NB |
433 | /* This is called after options have been parsed, and partially |
434 | processed. Setup for processing input from the file named FNAME, | |
435 | or stdin if it is the empty string. Return the original filename | |
436 | on success (e.g. foo.i->foo.c), or NULL on failure. */ | |
437 | const char * | |
b4e46cea | 438 | cpp_read_main_file (pfile, fname) |
6de1e2a9 | 439 | cpp_reader *pfile; |
7ceb3598 | 440 | const char *fname; |
6de1e2a9 | 441 | { |
2443d4e1 NB |
442 | sanity_checks (pfile); |
443 | ||
f4ff5a69 NB |
444 | post_options (pfile); |
445 | ||
c19b12cb NB |
446 | /* Mark named operators before handling command line macros. */ |
447 | if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names)) | |
448 | mark_named_operators (pfile); | |
449 | ||
f4ff5a69 NB |
450 | if (CPP_OPTION (pfile, deps.style) != DEPS_NONE) |
451 | { | |
452 | if (!pfile->deps) | |
453 | pfile->deps = deps_init (); | |
454 | ||
455 | /* Set the default target (if there is none already). */ | |
456 | deps_add_default_target (pfile->deps, fname); | |
457 | } | |
96302433 | 458 | |
f5e99456 | 459 | /* Open the main input file. */ |
26aea073 | 460 | pfile->line = 1; |
614c7d37 | 461 | if (!_cpp_read_file (pfile, fname)) |
f5e99456 | 462 | return NULL; |
c45da1ca | 463 | |
f4ff5a69 NB |
464 | /* Set this here so the client can change the option if it wishes, |
465 | and after stacking the main file so we don't trace the main | |
466 | file. */ | |
5993019d NB |
467 | pfile->line_maps.trace_includes = CPP_OPTION (pfile, print_include_names); |
468 | ||
f5e99456 NB |
469 | /* For foo.i, read the original filename foo.c now, for the benefit |
470 | of the front ends. */ | |
471 | if (CPP_OPTION (pfile, preprocessed)) | |
472 | read_original_filename (pfile); | |
473 | ||
474 | return pfile->map->to_file; | |
475 | } | |
476 | ||
477 | /* For preprocessed files, if the first tokens are of the form # NUM. | |
478 | handle the directive so we know the original file name. This will | |
479 | generate file_change callbacks, which the front ends must handle | |
480 | appropriately given their state of initialization. */ | |
481 | static void | |
482 | read_original_filename (pfile) | |
483 | cpp_reader *pfile; | |
484 | { | |
485 | const cpp_token *token, *token1; | |
486 | ||
487 | /* Lex ahead; if the first tokens are of the form # NUM, then | |
488 | process the directive, otherwise back up. */ | |
489 | token = _cpp_lex_direct (pfile); | |
490 | if (token->type == CPP_HASH) | |
491 | { | |
492 | token1 = _cpp_lex_direct (pfile); | |
493 | _cpp_backup_tokens (pfile, 1); | |
494 | ||
495 | /* If it's a #line directive, handle it. */ | |
496 | if (token1->type == CPP_NUMBER) | |
497 | { | |
498 | _cpp_handle_directive (pfile, token->flags & PREV_WHITE); | |
499 | return; | |
500 | } | |
501 | } | |
502 | ||
503 | /* Backup as if nothing happened. */ | |
504 | _cpp_backup_tokens (pfile, 1); | |
505 | } | |
506 | ||
76c3e73e NB |
507 | /* This is called at the end of preprocessing. It pops the last |
508 | buffer and writes dependency output, and returns the number of | |
509 | errors. | |
510 | ||
511 | Maybe it should also reset state, such that you could call | |
512 | cpp_start_read with a new filename to restart processing. */ | |
513 | int | |
514 | cpp_finish (pfile, deps_stream) | |
6de1e2a9 | 515 | cpp_reader *pfile; |
76c3e73e | 516 | FILE *deps_stream; |
6de1e2a9 | 517 | { |
a69cbaac NB |
518 | /* Warn about unused macros before popping the final buffer. */ |
519 | if (CPP_OPTION (pfile, warn_unused_macros)) | |
520 | cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL); | |
521 | ||
7364fdd8 NB |
522 | /* cpplex.c leaves the final buffer on the stack. This it so that |
523 | it returns an unending stream of CPP_EOFs to the client. If we | |
a1f300c0 | 524 | popped the buffer, we'd dereference a NULL buffer pointer and |
7364fdd8 NB |
525 | segfault. It's nice to allow the client to do worry-free excess |
526 | cpp_get_token calls. */ | |
527 | while (pfile->buffer) | |
528 | _cpp_pop_buffer (pfile); | |
c1212d2f | 529 | |
76c3e73e | 530 | /* Don't write the deps file if there are errors. */ |
f4ff5a69 NB |
531 | if (CPP_OPTION (pfile, deps.style) != DEPS_NONE |
532 | && deps_stream && pfile->errors == 0) | |
76c3e73e NB |
533 | { |
534 | deps_write (pfile->deps, deps_stream, 72); | |
535 | ||
f4ff5a69 | 536 | if (CPP_OPTION (pfile, deps.phony_targets)) |
76c3e73e NB |
537 | deps_phony_targets (pfile->deps, deps_stream); |
538 | } | |
3caee4a8 | 539 | |
d4506961 ZW |
540 | /* Report on headers that could use multiple include guards. */ |
541 | if (CPP_OPTION (pfile, print_include_names)) | |
c71f835b | 542 | _cpp_report_missing_guards (pfile); |
76c3e73e NB |
543 | |
544 | return pfile->errors; | |
6de1e2a9 ZW |
545 | } |
546 | ||
f4ff5a69 NB |
547 | static void |
548 | post_options (pfile) | |
96302433 NB |
549 | cpp_reader *pfile; |
550 | { | |
551 | /* -Wtraditional is not useful in C++ mode. */ | |
552 | if (CPP_OPTION (pfile, cplusplus)) | |
553 | CPP_OPTION (pfile, warn_traditional) = 0; | |
554 | ||
6d4587f7 | 555 | /* Permanently disable macro expansion if we are rescanning |
43612ffb | 556 | preprocessed text. Read preprocesed source in ISO mode. */ |
6d4587f7 | 557 | if (CPP_OPTION (pfile, preprocessed)) |
43612ffb NB |
558 | { |
559 | pfile->state.prevent_expansion = 1; | |
560 | CPP_OPTION (pfile, traditional) = 0; | |
561 | } | |
562 | ||
a8eb6044 NB |
563 | if (CPP_OPTION (pfile, warn_trigraphs) == 2) |
564 | CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs); | |
565 | ||
43612ffb | 566 | if (CPP_OPTION (pfile, traditional)) |
26aea073 NB |
567 | { |
568 | /* Traditional CPP does not accurately track column information. */ | |
569 | CPP_OPTION (pfile, show_column) = 0; | |
570 | CPP_OPTION (pfile, trigraphs) = 0; | |
571 | CPP_OPTION (pfile, warn_trigraphs) = 0; | |
572 | } | |
b1822ccc NB |
573 | |
574 | /* C99 permits implementation-defined characters in identifiers. | |
575 | The documented meaning of -std= is to turn off extensions that | |
576 | conflict with the specified standard, and since a strictly | |
577 | conforming program cannot contain a '$', we do not condition | |
578 | their acceptance on the -std= setting. */ | |
579 | pfile->warn_dollars = CPP_PEDANTIC (pfile) && !CPP_OPTION (pfile, c99); | |
7ca3d2b1 | 580 | } |