Mercurial > hg > CbC > CbC_gcc
annotate libcpp/init.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
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date | Tue, 22 Mar 2011 17:18:12 +0900 |
parents | b7f97abdc517 |
children | 04ced10e8804 |
rev | line source |
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0 | 1 /* CPP Library. |
2 Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, | |
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3 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, |
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4 2009, 2010 Free Software Foundation, Inc. |
0 | 5 Contributed by Per Bothner, 1994-95. |
6 Based on CCCP program by Paul Rubin, June 1986 | |
7 Adapted to ANSI C, Richard Stallman, Jan 1987 | |
8 | |
9 This program is free software; you can redistribute it and/or modify it | |
10 under the terms of the GNU General Public License as published by the | |
11 Free Software Foundation; either version 3, or (at your option) any | |
12 later version. | |
13 | |
14 This program is distributed in the hope that it will be useful, | |
15 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 GNU General Public License for more details. | |
18 | |
19 You should have received a copy of the GNU General Public License | |
20 along with this program; see the file COPYING3. If not see | |
21 <http://www.gnu.org/licenses/>. */ | |
22 | |
23 #include "config.h" | |
24 #include "system.h" | |
25 #include "cpplib.h" | |
26 #include "internal.h" | |
27 #include "mkdeps.h" | |
28 #include "localedir.h" | |
29 | |
30 static void init_library (void); | |
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31 static void mark_named_operators (cpp_reader *, int); |
0 | 32 static void read_original_filename (cpp_reader *); |
33 static void read_original_directory (cpp_reader *); | |
34 static void post_options (cpp_reader *); | |
35 | |
36 /* If we have designated initializers (GCC >2.7) these tables can be | |
37 initialized, constant data. Otherwise, they have to be filled in at | |
38 runtime. */ | |
39 #if HAVE_DESIGNATED_INITIALIZERS | |
40 | |
41 #define init_trigraph_map() /* Nothing. */ | |
42 #define TRIGRAPH_MAP \ | |
43 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { | |
44 | |
45 #define END }; | |
46 #define s(p, v) [p] = v, | |
47 | |
48 #else | |
49 | |
50 #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \ | |
51 static void init_trigraph_map (void) { \ | |
52 unsigned char *x = _cpp_trigraph_map; | |
53 | |
54 #define END } | |
55 #define s(p, v) x[p] = v; | |
56 | |
57 #endif | |
58 | |
59 TRIGRAPH_MAP | |
60 s('=', '#') s(')', ']') s('!', '|') | |
61 s('(', '[') s('\'', '^') s('>', '}') | |
62 s('/', '\\') s('<', '{') s('-', '~') | |
63 END | |
64 | |
65 #undef s | |
66 #undef END | |
67 #undef TRIGRAPH_MAP | |
68 | |
69 /* A set of booleans indicating what CPP features each source language | |
70 requires. */ | |
71 struct lang_flags | |
72 { | |
73 char c99; | |
74 char cplusplus; | |
75 char extended_numbers; | |
76 char extended_identifiers; | |
77 char std; | |
78 char cplusplus_comments; | |
79 char digraphs; | |
80 char uliterals; | |
81 }; | |
82 | |
83 static const struct lang_flags lang_defaults[] = | |
84 { /* c99 c++ xnum xid std // digr ulit */ | |
85 /* GNUC89 */ { 0, 0, 1, 0, 0, 1, 1, 0 }, | |
86 /* GNUC99 */ { 1, 0, 1, 0, 0, 1, 1, 1 }, | |
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87 /* GNUC1X */ { 1, 0, 1, 0, 0, 1, 1, 1 }, |
0 | 88 /* STDC89 */ { 0, 0, 0, 0, 1, 0, 0, 0 }, |
89 /* STDC94 */ { 0, 0, 0, 0, 1, 0, 1, 0 }, | |
90 /* STDC99 */ { 1, 0, 1, 0, 1, 1, 1, 0 }, | |
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91 /* STDC1X */ { 1, 0, 1, 0, 1, 1, 1, 0 }, |
0 | 92 /* GNUCXX */ { 0, 1, 1, 0, 0, 1, 1, 0 }, |
93 /* CXX98 */ { 0, 1, 1, 0, 1, 1, 1, 0 }, | |
94 /* GNUCXX0X */ { 1, 1, 1, 0, 0, 1, 1, 1 }, | |
95 /* CXX0X */ { 1, 1, 1, 0, 1, 1, 1, 1 }, | |
96 /* ASM */ { 0, 0, 1, 0, 0, 1, 0, 0 } | |
97 /* xid should be 1 for GNUC99, STDC99, GNUCXX, CXX98, GNUCXX0X, and | |
98 CXX0X when no longer experimental (when all uses of identifiers | |
99 in the compiler have been audited for correct handling of | |
100 extended identifiers). */ | |
101 }; | |
102 | |
103 /* Sets internal flags correctly for a given language. */ | |
104 void | |
105 cpp_set_lang (cpp_reader *pfile, enum c_lang lang) | |
106 { | |
107 const struct lang_flags *l = &lang_defaults[(int) lang]; | |
108 | |
109 CPP_OPTION (pfile, lang) = lang; | |
110 | |
111 CPP_OPTION (pfile, c99) = l->c99; | |
112 CPP_OPTION (pfile, cplusplus) = l->cplusplus; | |
113 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers; | |
114 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers; | |
115 CPP_OPTION (pfile, std) = l->std; | |
116 CPP_OPTION (pfile, trigraphs) = l->std; | |
117 CPP_OPTION (pfile, cplusplus_comments) = l->cplusplus_comments; | |
118 CPP_OPTION (pfile, digraphs) = l->digraphs; | |
119 CPP_OPTION (pfile, uliterals) = l->uliterals; | |
120 } | |
121 | |
122 /* Initialize library global state. */ | |
123 static void | |
124 init_library (void) | |
125 { | |
126 static int initialized = 0; | |
127 | |
128 if (! initialized) | |
129 { | |
130 initialized = 1; | |
131 | |
132 /* Set up the trigraph map. This doesn't need to do anything if | |
133 we were compiled with a compiler that supports C99 designated | |
134 initializers. */ | |
135 init_trigraph_map (); | |
136 | |
137 #ifdef ENABLE_NLS | |
138 (void) bindtextdomain (PACKAGE, LOCALEDIR); | |
139 #endif | |
140 } | |
141 } | |
142 | |
143 /* Initialize a cpp_reader structure. */ | |
144 cpp_reader * | |
145 cpp_create_reader (enum c_lang lang, hash_table *table, | |
146 struct line_maps *line_table) | |
147 { | |
148 cpp_reader *pfile; | |
149 | |
150 /* Initialize this instance of the library if it hasn't been already. */ | |
151 init_library (); | |
152 | |
153 pfile = XCNEW (cpp_reader); | |
154 | |
155 cpp_set_lang (pfile, lang); | |
156 CPP_OPTION (pfile, warn_multichar) = 1; | |
157 CPP_OPTION (pfile, discard_comments) = 1; | |
158 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1; | |
159 CPP_OPTION (pfile, tabstop) = 8; | |
160 CPP_OPTION (pfile, operator_names) = 1; | |
161 CPP_OPTION (pfile, warn_trigraphs) = 2; | |
162 CPP_OPTION (pfile, warn_endif_labels) = 1; | |
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163 CPP_OPTION (pfile, cpp_warn_deprecated) = 1; |
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164 CPP_OPTION (pfile, cpp_warn_long_long) = 0; |
0 | 165 CPP_OPTION (pfile, dollars_in_ident) = 1; |
166 CPP_OPTION (pfile, warn_dollars) = 1; | |
167 CPP_OPTION (pfile, warn_variadic_macros) = 1; | |
168 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1; | |
169 CPP_OPTION (pfile, warn_normalize) = normalized_C; | |
170 | |
171 /* Default CPP arithmetic to something sensible for the host for the | |
172 benefit of dumb users like fix-header. */ | |
173 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long); | |
174 CPP_OPTION (pfile, char_precision) = CHAR_BIT; | |
175 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int); | |
176 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int); | |
177 CPP_OPTION (pfile, unsigned_char) = 0; | |
178 CPP_OPTION (pfile, unsigned_wchar) = 1; | |
179 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */ | |
180 | |
181 /* Default to no charset conversion. */ | |
182 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding (); | |
183 CPP_OPTION (pfile, wide_charset) = 0; | |
184 | |
185 /* Default the input character set to UTF-8. */ | |
186 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding (); | |
187 | |
188 /* A fake empty "directory" used as the starting point for files | |
189 looked up without a search path. Name cannot be '/' because we | |
190 don't want to prepend anything at all to filenames using it. All | |
191 other entries are correct zero-initialized. */ | |
192 pfile->no_search_path.name = (char *) ""; | |
193 | |
194 /* Initialize the line map. */ | |
195 pfile->line_table = line_table; | |
196 | |
197 /* Initialize lexer state. */ | |
198 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments); | |
199 | |
200 /* Set up static tokens. */ | |
201 pfile->avoid_paste.type = CPP_PADDING; | |
202 pfile->avoid_paste.val.source = NULL; | |
203 pfile->eof.type = CPP_EOF; | |
204 pfile->eof.flags = 0; | |
205 | |
206 /* Create a token buffer for the lexer. */ | |
207 _cpp_init_tokenrun (&pfile->base_run, 250); | |
208 pfile->cur_run = &pfile->base_run; | |
209 pfile->cur_token = pfile->base_run.base; | |
210 | |
211 /* Initialize the base context. */ | |
212 pfile->context = &pfile->base_context; | |
213 pfile->base_context.macro = 0; | |
214 pfile->base_context.prev = pfile->base_context.next = 0; | |
215 | |
216 /* Aligned and unaligned storage. */ | |
217 pfile->a_buff = _cpp_get_buff (pfile, 0); | |
218 pfile->u_buff = _cpp_get_buff (pfile, 0); | |
219 | |
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220 /* Initialize table for push_macro/pop_macro. */ |
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221 pfile->pushed_macros = 0; |
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222 |
0 | 223 /* The expression parser stack. */ |
224 _cpp_expand_op_stack (pfile); | |
225 | |
226 /* Initialize the buffer obstack. */ | |
227 _obstack_begin (&pfile->buffer_ob, 0, 0, | |
228 (void *(*) (long)) xmalloc, | |
229 (void (*) (void *)) free); | |
230 | |
231 _cpp_init_files (pfile); | |
232 | |
233 _cpp_init_hashtable (pfile, table); | |
234 | |
235 return pfile; | |
236 } | |
237 | |
238 /* Set the line_table entry in PFILE. This is called after reading a | |
239 PCH file, as the old line_table will be incorrect. */ | |
240 void | |
241 cpp_set_line_map (cpp_reader *pfile, struct line_maps *line_table) | |
242 { | |
243 pfile->line_table = line_table; | |
244 } | |
245 | |
246 /* Free resources used by PFILE. Accessing PFILE after this function | |
247 returns leads to undefined behavior. Returns the error count. */ | |
248 void | |
249 cpp_destroy (cpp_reader *pfile) | |
250 { | |
251 cpp_context *context, *contextn; | |
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252 struct def_pragma_macro *pmacro; |
0 | 253 tokenrun *run, *runn; |
254 int i; | |
255 | |
256 free (pfile->op_stack); | |
257 | |
258 while (CPP_BUFFER (pfile) != NULL) | |
259 _cpp_pop_buffer (pfile); | |
260 | |
261 if (pfile->out.base) | |
262 free (pfile->out.base); | |
263 | |
264 if (pfile->macro_buffer) | |
265 { | |
266 free (pfile->macro_buffer); | |
267 pfile->macro_buffer = NULL; | |
268 pfile->macro_buffer_len = 0; | |
269 } | |
270 | |
271 if (pfile->deps) | |
272 deps_free (pfile->deps); | |
273 obstack_free (&pfile->buffer_ob, 0); | |
274 | |
275 _cpp_destroy_hashtable (pfile); | |
276 _cpp_cleanup_files (pfile); | |
277 _cpp_destroy_iconv (pfile); | |
278 | |
279 _cpp_free_buff (pfile->a_buff); | |
280 _cpp_free_buff (pfile->u_buff); | |
281 _cpp_free_buff (pfile->free_buffs); | |
282 | |
283 for (run = &pfile->base_run; run; run = runn) | |
284 { | |
285 runn = run->next; | |
286 free (run->base); | |
287 if (run != &pfile->base_run) | |
288 free (run); | |
289 } | |
290 | |
291 for (context = pfile->base_context.next; context; context = contextn) | |
292 { | |
293 contextn = context->next; | |
294 free (context); | |
295 } | |
296 | |
297 if (pfile->comments.entries) | |
298 { | |
299 for (i = 0; i < pfile->comments.count; i++) | |
300 free (pfile->comments.entries[i].comment); | |
301 | |
302 free (pfile->comments.entries); | |
303 } | |
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304 if (pfile->pushed_macros) |
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305 { |
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306 do |
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307 { |
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308 pmacro = pfile->pushed_macros; |
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309 pfile->pushed_macros = pmacro->next; |
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310 free (pmacro->name); |
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311 free (pmacro); |
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312 } |
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313 while (pfile->pushed_macros); |
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314 } |
0 | 315 |
316 free (pfile); | |
317 } | |
318 | |
319 /* This structure defines one built-in identifier. A node will be | |
320 entered in the hash table under the name NAME, with value VALUE. | |
321 | |
322 There are two tables of these. builtin_array holds all the | |
323 "builtin" macros: these are handled by builtin_macro() in | |
324 macro.c. Builtin is somewhat of a misnomer -- the property of | |
325 interest is that these macros require special code to compute their | |
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326 expansions. The value is a "cpp_builtin_type" enumerator. |
0 | 327 |
328 operator_array holds the C++ named operators. These are keywords | |
329 which act as aliases for punctuators. In C++, they cannot be | |
330 altered through #define, and #if recognizes them as operators. In | |
331 C, these are not entered into the hash table at all (but see | |
332 <iso646.h>). The value is a token-type enumerator. */ | |
333 struct builtin_macro | |
334 { | |
335 const uchar *const name; | |
336 const unsigned short len; | |
337 const unsigned short value; | |
338 const bool always_warn_if_redefined; | |
339 }; | |
340 | |
341 #define B(n, t, f) { DSC(n), t, f } | |
342 static const struct builtin_macro builtin_array[] = | |
343 { | |
344 B("__TIMESTAMP__", BT_TIMESTAMP, false), | |
345 B("__TIME__", BT_TIME, false), | |
346 B("__DATE__", BT_DATE, false), | |
347 B("__FILE__", BT_FILE, false), | |
348 B("__BASE_FILE__", BT_BASE_FILE, false), | |
349 B("__LINE__", BT_SPECLINE, true), | |
350 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true), | |
351 B("__COUNTER__", BT_COUNTER, true), | |
352 /* Keep builtins not used for -traditional-cpp at the end, and | |
353 update init_builtins() if any more are added. */ | |
354 B("_Pragma", BT_PRAGMA, true), | |
355 B("__STDC__", BT_STDC, true), | |
356 }; | |
357 #undef B | |
358 | |
359 struct builtin_operator | |
360 { | |
361 const uchar *const name; | |
362 const unsigned short len; | |
363 const unsigned short value; | |
364 }; | |
365 | |
366 #define B(n, t) { DSC(n), t } | |
367 static const struct builtin_operator operator_array[] = | |
368 { | |
369 B("and", CPP_AND_AND), | |
370 B("and_eq", CPP_AND_EQ), | |
371 B("bitand", CPP_AND), | |
372 B("bitor", CPP_OR), | |
373 B("compl", CPP_COMPL), | |
374 B("not", CPP_NOT), | |
375 B("not_eq", CPP_NOT_EQ), | |
376 B("or", CPP_OR_OR), | |
377 B("or_eq", CPP_OR_EQ), | |
378 B("xor", CPP_XOR), | |
379 B("xor_eq", CPP_XOR_EQ) | |
380 }; | |
381 #undef B | |
382 | |
383 /* Mark the C++ named operators in the hash table. */ | |
384 static void | |
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385 mark_named_operators (cpp_reader *pfile, int flags) |
0 | 386 { |
387 const struct builtin_operator *b; | |
388 | |
389 for (b = operator_array; | |
390 b < (operator_array + ARRAY_SIZE (operator_array)); | |
391 b++) | |
392 { | |
393 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); | |
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394 hp->flags |= flags; |
0 | 395 hp->is_directive = 0; |
396 hp->directive_index = b->value; | |
397 } | |
398 } | |
399 | |
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400 /* Helper function of cpp_type2name. Return the string associated with |
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401 named operator TYPE. */ |
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402 const char * |
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403 cpp_named_operator2name (enum cpp_ttype type) |
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404 { |
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405 const struct builtin_operator *b; |
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406 |
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407 for (b = operator_array; |
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408 b < (operator_array + ARRAY_SIZE (operator_array)); |
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409 b++) |
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410 { |
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411 if (type == b->value) |
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412 return (const char *) b->name; |
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413 } |
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414 |
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415 return NULL; |
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416 } |
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417 |
0 | 418 void |
419 cpp_init_special_builtins (cpp_reader *pfile) | |
420 { | |
421 const struct builtin_macro *b; | |
422 size_t n = ARRAY_SIZE (builtin_array); | |
423 | |
424 if (CPP_OPTION (pfile, traditional)) | |
425 n -= 2; | |
426 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers) | |
427 || CPP_OPTION (pfile, std)) | |
428 n--; | |
429 | |
430 for (b = builtin_array; b < builtin_array + n; b++) | |
431 { | |
432 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len); | |
433 hp->type = NT_MACRO; | |
434 hp->flags |= NODE_BUILTIN; | |
435 if (b->always_warn_if_redefined | |
436 || CPP_OPTION (pfile, warn_builtin_macro_redefined)) | |
437 hp->flags |= NODE_WARN; | |
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438 hp->value.builtin = (enum cpp_builtin_type) b->value; |
0 | 439 } |
440 } | |
441 | |
442 /* Read the builtins table above and enter them, and language-specific | |
443 macros, into the hash table. HOSTED is true if this is a hosted | |
444 environment. */ | |
445 void | |
446 cpp_init_builtins (cpp_reader *pfile, int hosted) | |
447 { | |
448 cpp_init_special_builtins (pfile); | |
449 | |
450 if (!CPP_OPTION (pfile, traditional) | |
451 && (! CPP_OPTION (pfile, stdc_0_in_system_headers) | |
452 || CPP_OPTION (pfile, std))) | |
453 _cpp_define_builtin (pfile, "__STDC__ 1"); | |
454 | |
455 if (CPP_OPTION (pfile, cplusplus)) | |
456 _cpp_define_builtin (pfile, "__cplusplus 1"); | |
457 else if (CPP_OPTION (pfile, lang) == CLK_ASM) | |
458 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1"); | |
459 else if (CPP_OPTION (pfile, lang) == CLK_STDC94) | |
460 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L"); | |
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461 else if (CPP_OPTION (pfile, lang) == CLK_STDC1X |
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462 || CPP_OPTION (pfile, lang) == CLK_GNUC1X) |
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463 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201000L"); |
0 | 464 else if (CPP_OPTION (pfile, c99)) |
465 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L"); | |
466 | |
467 if (hosted) | |
468 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1"); | |
469 else | |
470 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0"); | |
471 | |
472 if (CPP_OPTION (pfile, objc)) | |
473 _cpp_define_builtin (pfile, "__OBJC__ 1"); | |
474 } | |
475 | |
476 /* Sanity-checks are dependent on command-line options, so it is | |
477 called as a subroutine of cpp_read_main_file (). */ | |
478 #if ENABLE_CHECKING | |
479 static void sanity_checks (cpp_reader *); | |
480 static void sanity_checks (cpp_reader *pfile) | |
481 { | |
482 cppchar_t test = 0; | |
483 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part); | |
484 | |
485 /* Sanity checks for assumptions about CPP arithmetic and target | |
486 type precisions made by cpplib. */ | |
487 test--; | |
488 if (test < 1) | |
489 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type"); | |
490 | |
491 if (CPP_OPTION (pfile, precision) > max_precision) | |
492 cpp_error (pfile, CPP_DL_ICE, | |
493 "preprocessor arithmetic has maximum precision of %lu bits;" | |
494 " target requires %lu bits", | |
495 (unsigned long) max_precision, | |
496 (unsigned long) CPP_OPTION (pfile, precision)); | |
497 | |
498 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision)) | |
499 cpp_error (pfile, CPP_DL_ICE, | |
500 "CPP arithmetic must be at least as precise as a target int"); | |
501 | |
502 if (CPP_OPTION (pfile, char_precision) < 8) | |
503 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide"); | |
504 | |
505 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision)) | |
506 cpp_error (pfile, CPP_DL_ICE, | |
507 "target wchar_t is narrower than target char"); | |
508 | |
509 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision)) | |
510 cpp_error (pfile, CPP_DL_ICE, | |
511 "target int is narrower than target char"); | |
512 | |
513 /* This is assumed in eval_token() and could be fixed if necessary. */ | |
514 if (sizeof (cppchar_t) > sizeof (cpp_num_part)) | |
515 cpp_error (pfile, CPP_DL_ICE, | |
516 "CPP half-integer narrower than CPP character"); | |
517 | |
518 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T) | |
519 cpp_error (pfile, CPP_DL_ICE, | |
520 "CPP on this host cannot handle wide character constants over" | |
521 " %lu bits, but the target requires %lu bits", | |
522 (unsigned long) BITS_PER_CPPCHAR_T, | |
523 (unsigned long) CPP_OPTION (pfile, wchar_precision)); | |
524 } | |
525 #else | |
526 # define sanity_checks(PFILE) | |
527 #endif | |
528 | |
529 /* This is called after options have been parsed, and partially | |
530 processed. */ | |
531 void | |
532 cpp_post_options (cpp_reader *pfile) | |
533 { | |
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534 int flags; |
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535 |
0 | 536 sanity_checks (pfile); |
537 | |
538 post_options (pfile); | |
539 | |
540 /* Mark named operators before handling command line macros. */ | |
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541 flags = 0; |
0 | 542 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names)) |
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543 flags |= NODE_OPERATOR; |
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544 if (CPP_OPTION (pfile, warn_cxx_operator_names)) |
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545 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR; |
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546 if (flags != 0) |
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547 mark_named_operators (pfile, flags); |
0 | 548 } |
549 | |
550 /* Setup for processing input from the file named FNAME, or stdin if | |
551 it is the empty string. Return the original filename | |
552 on success (e.g. foo.i->foo.c), or NULL on failure. */ | |
553 const char * | |
554 cpp_read_main_file (cpp_reader *pfile, const char *fname) | |
555 { | |
556 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE) | |
557 { | |
558 if (!pfile->deps) | |
559 pfile->deps = deps_init (); | |
560 | |
561 /* Set the default target (if there is none already). */ | |
562 deps_add_default_target (pfile->deps, fname); | |
563 } | |
564 | |
565 pfile->main_file | |
566 = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0); | |
567 if (_cpp_find_failed (pfile->main_file)) | |
568 return NULL; | |
569 | |
570 _cpp_stack_file (pfile, pfile->main_file, false); | |
571 | |
572 /* For foo.i, read the original filename foo.c now, for the benefit | |
573 of the front ends. */ | |
574 if (CPP_OPTION (pfile, preprocessed)) | |
575 { | |
576 read_original_filename (pfile); | |
577 fname = pfile->line_table->maps[pfile->line_table->used-1].to_file; | |
578 } | |
579 return fname; | |
580 } | |
581 | |
582 /* For preprocessed files, if the first tokens are of the form # NUM. | |
583 handle the directive so we know the original file name. This will | |
584 generate file_change callbacks, which the front ends must handle | |
585 appropriately given their state of initialization. */ | |
586 static void | |
587 read_original_filename (cpp_reader *pfile) | |
588 { | |
589 const cpp_token *token, *token1; | |
590 | |
591 /* Lex ahead; if the first tokens are of the form # NUM, then | |
592 process the directive, otherwise back up. */ | |
593 token = _cpp_lex_direct (pfile); | |
594 if (token->type == CPP_HASH) | |
595 { | |
596 pfile->state.in_directive = 1; | |
597 token1 = _cpp_lex_direct (pfile); | |
598 _cpp_backup_tokens (pfile, 1); | |
599 pfile->state.in_directive = 0; | |
600 | |
601 /* If it's a #line directive, handle it. */ | |
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602 if (token1->type == CPP_NUMBER |
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603 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE)) |
0 | 604 { |
605 read_original_directory (pfile); | |
606 return; | |
607 } | |
608 } | |
609 | |
610 /* Backup as if nothing happened. */ | |
611 _cpp_backup_tokens (pfile, 1); | |
612 } | |
613 | |
614 /* For preprocessed files, if the tokens following the first filename | |
615 line is of the form # <line> "/path/name//", handle the | |
616 directive so we know the original current directory. */ | |
617 static void | |
618 read_original_directory (cpp_reader *pfile) | |
619 { | |
620 const cpp_token *hash, *token; | |
621 | |
622 /* Lex ahead; if the first tokens are of the form # NUM, then | |
623 process the directive, otherwise back up. */ | |
624 hash = _cpp_lex_direct (pfile); | |
625 if (hash->type != CPP_HASH) | |
626 { | |
627 _cpp_backup_tokens (pfile, 1); | |
628 return; | |
629 } | |
630 | |
631 token = _cpp_lex_direct (pfile); | |
632 | |
633 if (token->type != CPP_NUMBER) | |
634 { | |
635 _cpp_backup_tokens (pfile, 2); | |
636 return; | |
637 } | |
638 | |
639 token = _cpp_lex_direct (pfile); | |
640 | |
641 if (token->type != CPP_STRING | |
642 || ! (token->val.str.len >= 5 | |
643 && token->val.str.text[token->val.str.len-2] == '/' | |
644 && token->val.str.text[token->val.str.len-3] == '/')) | |
645 { | |
646 _cpp_backup_tokens (pfile, 3); | |
647 return; | |
648 } | |
649 | |
650 if (pfile->cb.dir_change) | |
651 { | |
652 char *debugdir = (char *) alloca (token->val.str.len - 3); | |
653 | |
654 memcpy (debugdir, (const char *) token->val.str.text + 1, | |
655 token->val.str.len - 4); | |
656 debugdir[token->val.str.len - 4] = '\0'; | |
657 | |
658 pfile->cb.dir_change (pfile, debugdir); | |
659 } | |
660 } | |
661 | |
662 /* This is called at the end of preprocessing. It pops the last | |
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663 buffer and writes dependency output. |
0 | 664 |
665 Maybe it should also reset state, such that you could call | |
666 cpp_start_read with a new filename to restart processing. */ | |
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667 void |
0 | 668 cpp_finish (cpp_reader *pfile, FILE *deps_stream) |
669 { | |
670 /* Warn about unused macros before popping the final buffer. */ | |
671 if (CPP_OPTION (pfile, warn_unused_macros)) | |
672 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL); | |
673 | |
674 /* lex.c leaves the final buffer on the stack. This it so that | |
675 it returns an unending stream of CPP_EOFs to the client. If we | |
676 popped the buffer, we'd dereference a NULL buffer pointer and | |
677 segfault. It's nice to allow the client to do worry-free excess | |
678 cpp_get_token calls. */ | |
679 while (pfile->buffer) | |
680 _cpp_pop_buffer (pfile); | |
681 | |
682 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE | |
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683 && deps_stream) |
0 | 684 { |
685 deps_write (pfile->deps, deps_stream, 72); | |
686 | |
687 if (CPP_OPTION (pfile, deps.phony_targets)) | |
688 deps_phony_targets (pfile->deps, deps_stream); | |
689 } | |
690 | |
691 /* Report on headers that could use multiple include guards. */ | |
692 if (CPP_OPTION (pfile, print_include_names)) | |
693 _cpp_report_missing_guards (pfile); | |
694 } | |
695 | |
696 static void | |
697 post_options (cpp_reader *pfile) | |
698 { | |
699 /* -Wtraditional is not useful in C++ mode. */ | |
700 if (CPP_OPTION (pfile, cplusplus)) | |
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701 CPP_OPTION (pfile, cpp_warn_traditional) = 0; |
0 | 702 |
703 /* Permanently disable macro expansion if we are rescanning | |
704 preprocessed text. Read preprocesed source in ISO mode. */ | |
705 if (CPP_OPTION (pfile, preprocessed)) | |
706 { | |
707 if (!CPP_OPTION (pfile, directives_only)) | |
708 pfile->state.prevent_expansion = 1; | |
709 CPP_OPTION (pfile, traditional) = 0; | |
710 } | |
711 | |
712 if (CPP_OPTION (pfile, warn_trigraphs) == 2) | |
713 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs); | |
714 | |
715 if (CPP_OPTION (pfile, traditional)) | |
716 { | |
717 CPP_OPTION (pfile, cplusplus_comments) = 0; | |
718 | |
719 CPP_OPTION (pfile, trigraphs) = 0; | |
720 CPP_OPTION (pfile, warn_trigraphs) = 0; | |
721 } | |
722 } |