1 /* CPP Library.
2 Copyright (C) 1986-2018 Free Software Foundation, Inc.
3 Contributed by Per Bothner, 1994-95.
4 Based on CCCP program by Paul Rubin, June 1986
5 Adapted to ANSI C, Richard Stallman, Jan 1987
6
7 This program is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3, or (at your option) any
10 later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #include "config.h"
22 #include "system.h"
23 #include "cpplib.h"
24 #include "internal.h"
25 #include "mkdeps.h"
26 #include "localedir.h"
27 #include "filenames.h"
28
29 #ifndef ENABLE_CANONICAL_SYSTEM_HEADERS
30 #ifdef HAVE_DOS_BASED_FILE_SYSTEM
31 #define ENABLE_CANONICAL_SYSTEM_HEADERS 1
32 #else
33 #define ENABLE_CANONICAL_SYSTEM_HEADERS 0
34 #endif
35 #endif
36
37 static void init_library (void);
38 static void mark_named_operators (cpp_reader *, int);
39 static void read_original_filename (cpp_reader *);
40 static void read_original_directory (cpp_reader *);
41 static void post_options (cpp_reader *);
42
43 /* If we have designated initializers (GCC >2.7) these tables can be
44 initialized, constant data. Otherwise, they have to be filled in at
45 runtime. */
46 #if HAVE_DESIGNATED_INITIALIZERS
47
48 #define init_trigraph_map() /* Nothing. */
49 #define TRIGRAPH_MAP \
50 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
51
52 #define END };
53 #define s(p, v) [p] = v,
54
55 #else
56
57 #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
58 static void init_trigraph_map (void) { \
59 unsigned char *x = _cpp_trigraph_map;
60
61 #define END }
62 #define s(p, v) x[p] = v;
63
64 #endif
65
66 TRIGRAPH_MAP
67 s('=', '#') s(')', ']') s('!', '|')
68 s('(', '[') s('\'', '^') s('>', '}')
69 s('/', '\\') s('<', '{') s('-', '~')
70 END
71
72 #undef s
73 #undef END
74 #undef TRIGRAPH_MAP
75
76 /* A set of booleans indicating what CPP features each source language
77 requires. */
78 struct lang_flags
79 {
80 char c99;
81 char cplusplus;
82 char extended_numbers;
83 char extended_identifiers;
84 char c11_identifiers;
85 char std;
86 char digraphs;
87 char uliterals;
88 char rliterals;
89 char user_literals;
90 char binary_constants;
91 char digit_separators;
92 char trigraphs;
93 char utf8_char_literals;
94 char va_opt;
95 };
96
97 static const struct lang_flags lang_defaults[] =
98 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt */
99 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1 },
100 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1 },
101 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1 },
102 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1 },
103 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0 },
104 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 },
105 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 },
106 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0 },
107 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0 },
108 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1 },
109 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0 },
110 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1 },
111 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0 },
112 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1 },
113 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0 },
114 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1 },
115 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0 },
116 /* GNUCXX2A */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1 },
117 /* CXX2A */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1 },
118 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
119 };
120
121 /* Sets internal flags correctly for a given language. */
122 void
cpp_set_lang(cpp_reader * pfile,enum c_lang lang)123 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
124 {
125 const struct lang_flags *l = &lang_defaults[(int) lang];
126
127 CPP_OPTION (pfile, lang) = lang;
128
129 CPP_OPTION (pfile, c99) = l->c99;
130 CPP_OPTION (pfile, cplusplus) = l->cplusplus;
131 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers;
132 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers;
133 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers;
134 CPP_OPTION (pfile, std) = l->std;
135 CPP_OPTION (pfile, digraphs) = l->digraphs;
136 CPP_OPTION (pfile, uliterals) = l->uliterals;
137 CPP_OPTION (pfile, rliterals) = l->rliterals;
138 CPP_OPTION (pfile, user_literals) = l->user_literals;
139 CPP_OPTION (pfile, binary_constants) = l->binary_constants;
140 CPP_OPTION (pfile, digit_separators) = l->digit_separators;
141 CPP_OPTION (pfile, trigraphs) = l->trigraphs;
142 CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals;
143 CPP_OPTION (pfile, va_opt) = l->va_opt;
144 }
145
146 /* Initialize library global state. */
147 static void
init_library(void)148 init_library (void)
149 {
150 static int initialized = 0;
151
152 if (! initialized)
153 {
154 initialized = 1;
155
156 _cpp_init_lexer ();
157
158 /* Set up the trigraph map. This doesn't need to do anything if
159 we were compiled with a compiler that supports C99 designated
160 initializers. */
161 init_trigraph_map ();
162
163 #ifdef ENABLE_NLS
164 (void) bindtextdomain (PACKAGE, LOCALEDIR);
165 #endif
166 }
167 }
168
169 /* Initialize a cpp_reader structure. */
170 cpp_reader *
cpp_create_reader(enum c_lang lang,cpp_hash_table * table,struct line_maps * line_table)171 cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
172 struct line_maps *line_table)
173 {
174 cpp_reader *pfile;
175
176 /* Initialize this instance of the library if it hasn't been already. */
177 init_library ();
178
179 pfile = XCNEW (cpp_reader);
180 memset (&pfile->base_context, 0, sizeof (pfile->base_context));
181
182 cpp_set_lang (pfile, lang);
183 CPP_OPTION (pfile, warn_multichar) = 1;
184 CPP_OPTION (pfile, discard_comments) = 1;
185 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
186 CPP_OPTION (pfile, tabstop) = 8;
187 CPP_OPTION (pfile, operator_names) = 1;
188 CPP_OPTION (pfile, warn_trigraphs) = 2;
189 CPP_OPTION (pfile, warn_endif_labels) = 1;
190 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1;
191 CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0;
192 CPP_OPTION (pfile, cpp_warn_deprecated) = 1;
193 CPP_OPTION (pfile, cpp_warn_long_long) = 0;
194 CPP_OPTION (pfile, dollars_in_ident) = 1;
195 CPP_OPTION (pfile, warn_dollars) = 1;
196 CPP_OPTION (pfile, warn_variadic_macros) = 1;
197 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
198 CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0;
199 /* By default, track locations of tokens resulting from macro
200 expansion. The '2' means, track the locations with the highest
201 accuracy. Read the comments for struct
202 cpp_options::track_macro_expansion to learn about the other
203 values. */
204 CPP_OPTION (pfile, track_macro_expansion) = 2;
205 CPP_OPTION (pfile, warn_normalize) = normalized_C;
206 CPP_OPTION (pfile, warn_literal_suffix) = 1;
207 CPP_OPTION (pfile, canonical_system_headers)
208 = ENABLE_CANONICAL_SYSTEM_HEADERS;
209 CPP_OPTION (pfile, ext_numeric_literals) = 1;
210 CPP_OPTION (pfile, warn_date_time) = 0;
211
212 /* Default CPP arithmetic to something sensible for the host for the
213 benefit of dumb users like fix-header. */
214 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
215 CPP_OPTION (pfile, char_precision) = CHAR_BIT;
216 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
217 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
218 CPP_OPTION (pfile, unsigned_char) = 0;
219 CPP_OPTION (pfile, unsigned_wchar) = 1;
220 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */
221
222 /* Default to no charset conversion. */
223 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
224 CPP_OPTION (pfile, wide_charset) = 0;
225
226 /* Default the input character set to UTF-8. */
227 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
228
229 /* A fake empty "directory" used as the starting point for files
230 looked up without a search path. Name cannot be '/' because we
231 don't want to prepend anything at all to filenames using it. All
232 other entries are correct zero-initialized. */
233 pfile->no_search_path.name = (char *) "";
234
235 /* Initialize the line map. */
236 pfile->line_table = line_table;
237
238 /* Initialize lexer state. */
239 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
240
241 /* Set up static tokens. */
242 pfile->avoid_paste.type = CPP_PADDING;
243 pfile->avoid_paste.val.source = NULL;
244 pfile->eof.type = CPP_EOF;
245 pfile->eof.flags = 0;
246
247 /* Create a token buffer for the lexer. */
248 _cpp_init_tokenrun (&pfile->base_run, 250);
249 pfile->cur_run = &pfile->base_run;
250 pfile->cur_token = pfile->base_run.base;
251
252 /* Initialize the base context. */
253 pfile->context = &pfile->base_context;
254 pfile->base_context.c.macro = 0;
255 pfile->base_context.prev = pfile->base_context.next = 0;
256
257 /* Aligned and unaligned storage. */
258 pfile->a_buff = _cpp_get_buff (pfile, 0);
259 pfile->u_buff = _cpp_get_buff (pfile, 0);
260
261 /* Initialize table for push_macro/pop_macro. */
262 pfile->pushed_macros = 0;
263
264 /* Do not force token locations by default. */
265 pfile->forced_token_location_p = NULL;
266
267 /* Initialize source_date_epoch to -2 (not yet set). */
268 pfile->source_date_epoch = (time_t) -2;
269
270 /* The expression parser stack. */
271 _cpp_expand_op_stack (pfile);
272
273 /* Initialize the buffer obstack. */
274 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
275
276 _cpp_init_files (pfile);
277
278 _cpp_init_hashtable (pfile, table);
279
280 return pfile;
281 }
282
283 /* Set the line_table entry in PFILE. This is called after reading a
284 PCH file, as the old line_table will be incorrect. */
285 void
cpp_set_line_map(cpp_reader * pfile,struct line_maps * line_table)286 cpp_set_line_map (cpp_reader *pfile, struct line_maps *line_table)
287 {
288 pfile->line_table = line_table;
289 }
290
291 /* Free resources used by PFILE. Accessing PFILE after this function
292 returns leads to undefined behavior. Returns the error count. */
293 void
cpp_destroy(cpp_reader * pfile)294 cpp_destroy (cpp_reader *pfile)
295 {
296 cpp_context *context, *contextn;
297 struct def_pragma_macro *pmacro;
298 tokenrun *run, *runn;
299 int i;
300
301 free (pfile->op_stack);
302
303 while (CPP_BUFFER (pfile) != NULL)
304 _cpp_pop_buffer (pfile);
305
306 free (pfile->out.base);
307
308 if (pfile->macro_buffer)
309 {
310 free (pfile->macro_buffer);
311 pfile->macro_buffer = NULL;
312 pfile->macro_buffer_len = 0;
313 }
314
315 if (pfile->deps)
316 deps_free (pfile->deps);
317 obstack_free (&pfile->buffer_ob, 0);
318
319 _cpp_destroy_hashtable (pfile);
320 _cpp_cleanup_files (pfile);
321 _cpp_destroy_iconv (pfile);
322
323 _cpp_free_buff (pfile->a_buff);
324 _cpp_free_buff (pfile->u_buff);
325 _cpp_free_buff (pfile->free_buffs);
326
327 for (run = &pfile->base_run; run; run = runn)
328 {
329 runn = run->next;
330 free (run->base);
331 if (run != &pfile->base_run)
332 free (run);
333 }
334
335 for (context = pfile->base_context.next; context; context = contextn)
336 {
337 contextn = context->next;
338 free (context);
339 }
340
341 if (pfile->comments.entries)
342 {
343 for (i = 0; i < pfile->comments.count; i++)
344 free (pfile->comments.entries[i].comment);
345
346 free (pfile->comments.entries);
347 }
348 if (pfile->pushed_macros)
349 {
350 do
351 {
352 pmacro = pfile->pushed_macros;
353 pfile->pushed_macros = pmacro->next;
354 free (pmacro->name);
355 free (pmacro);
356 }
357 while (pfile->pushed_macros);
358 }
359
360 free (pfile);
361 }
362
363 /* This structure defines one built-in identifier. A node will be
364 entered in the hash table under the name NAME, with value VALUE.
365
366 There are two tables of these. builtin_array holds all the
367 "builtin" macros: these are handled by builtin_macro() in
368 macro.c. Builtin is somewhat of a misnomer -- the property of
369 interest is that these macros require special code to compute their
370 expansions. The value is a "cpp_builtin_type" enumerator.
371
372 operator_array holds the C++ named operators. These are keywords
373 which act as aliases for punctuators. In C++, they cannot be
374 altered through #define, and #if recognizes them as operators. In
375 C, these are not entered into the hash table at all (but see
376 <iso646.h>). The value is a token-type enumerator. */
377 struct builtin_macro
378 {
379 const uchar *const name;
380 const unsigned short len;
381 const unsigned short value;
382 const bool always_warn_if_redefined;
383 };
384
385 #define B(n, t, f) { DSC(n), t, f }
386 static const struct builtin_macro builtin_array[] =
387 {
388 B("__TIMESTAMP__", BT_TIMESTAMP, false),
389 B("__TIME__", BT_TIME, false),
390 B("__DATE__", BT_DATE, false),
391 B("__FILE__", BT_FILE, false),
392 B("__BASE_FILE__", BT_BASE_FILE, false),
393 B("__LINE__", BT_SPECLINE, true),
394 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
395 B("__COUNTER__", BT_COUNTER, true),
396 B("__has_attribute", BT_HAS_ATTRIBUTE, true),
397 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
398 /* Keep builtins not used for -traditional-cpp at the end, and
399 update init_builtins() if any more are added. */
400 B("_Pragma", BT_PRAGMA, true),
401 B("__STDC__", BT_STDC, true),
402 };
403 #undef B
404
405 struct builtin_operator
406 {
407 const uchar *const name;
408 const unsigned short len;
409 const unsigned short value;
410 };
411
412 #define B(n, t) { DSC(n), t }
413 static const struct builtin_operator operator_array[] =
414 {
415 B("and", CPP_AND_AND),
416 B("and_eq", CPP_AND_EQ),
417 B("bitand", CPP_AND),
418 B("bitor", CPP_OR),
419 B("compl", CPP_COMPL),
420 B("not", CPP_NOT),
421 B("not_eq", CPP_NOT_EQ),
422 B("or", CPP_OR_OR),
423 B("or_eq", CPP_OR_EQ),
424 B("xor", CPP_XOR),
425 B("xor_eq", CPP_XOR_EQ)
426 };
427 #undef B
428
429 /* Mark the C++ named operators in the hash table. */
430 static void
mark_named_operators(cpp_reader * pfile,int flags)431 mark_named_operators (cpp_reader *pfile, int flags)
432 {
433 const struct builtin_operator *b;
434
435 for (b = operator_array;
436 b < (operator_array + ARRAY_SIZE (operator_array));
437 b++)
438 {
439 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
440 hp->flags |= flags;
441 hp->is_directive = 0;
442 hp->directive_index = b->value;
443 }
444 }
445
446 /* Helper function of cpp_type2name. Return the string associated with
447 named operator TYPE. */
448 const char *
cpp_named_operator2name(enum cpp_ttype type)449 cpp_named_operator2name (enum cpp_ttype type)
450 {
451 const struct builtin_operator *b;
452
453 for (b = operator_array;
454 b < (operator_array + ARRAY_SIZE (operator_array));
455 b++)
456 {
457 if (type == b->value)
458 return (const char *) b->name;
459 }
460
461 return NULL;
462 }
463
464 void
cpp_init_special_builtins(cpp_reader * pfile)465 cpp_init_special_builtins (cpp_reader *pfile)
466 {
467 const struct builtin_macro *b;
468 size_t n = ARRAY_SIZE (builtin_array);
469
470 if (CPP_OPTION (pfile, traditional))
471 n -= 2;
472 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
473 || CPP_OPTION (pfile, std))
474 n--;
475
476 for (b = builtin_array; b < builtin_array + n; b++)
477 {
478 if (b->value == BT_HAS_ATTRIBUTE
479 && (CPP_OPTION (pfile, lang) == CLK_ASM
480 || pfile->cb.has_attribute == NULL))
481 continue;
482 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
483 hp->type = NT_MACRO;
484 hp->flags |= NODE_BUILTIN;
485 if (b->always_warn_if_redefined)
486 hp->flags |= NODE_WARN;
487 hp->value.builtin = (enum cpp_builtin_type) b->value;
488 }
489 }
490
491 /* Restore macro C to builtin macro definition. */
492
493 void
_cpp_restore_special_builtin(cpp_reader * pfile,struct def_pragma_macro * c)494 _cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c)
495 {
496 size_t len = strlen (c->name);
497
498 for (const struct builtin_macro *b = builtin_array;
499 b < builtin_array + ARRAY_SIZE (builtin_array); b++)
500 if (b->len == len && memcmp (c->name, b->name, len + 1) == 0)
501 {
502 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
503 hp->type = NT_MACRO;
504 hp->flags |= NODE_BUILTIN;
505 if (b->always_warn_if_redefined)
506 hp->flags |= NODE_WARN;
507 hp->value.builtin = (enum cpp_builtin_type) b->value;
508 }
509 }
510
511 /* Read the builtins table above and enter them, and language-specific
512 macros, into the hash table. HOSTED is true if this is a hosted
513 environment. */
514 void
cpp_init_builtins(cpp_reader * pfile,int hosted)515 cpp_init_builtins (cpp_reader *pfile, int hosted)
516 {
517 cpp_init_special_builtins (pfile);
518
519 if (!CPP_OPTION (pfile, traditional)
520 && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
521 || CPP_OPTION (pfile, std)))
522 _cpp_define_builtin (pfile, "__STDC__ 1");
523
524 if (CPP_OPTION (pfile, cplusplus))
525 {
526 if (CPP_OPTION (pfile, lang) == CLK_CXX2A
527 || CPP_OPTION (pfile, lang) == CLK_GNUCXX2A)
528 _cpp_define_builtin (pfile, "__cplusplus 201709L");
529 else if (CPP_OPTION (pfile, lang) == CLK_CXX17
530 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
531 _cpp_define_builtin (pfile, "__cplusplus 201703L");
532 else if (CPP_OPTION (pfile, lang) == CLK_CXX14
533 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
534 _cpp_define_builtin (pfile, "__cplusplus 201402L");
535 else if (CPP_OPTION (pfile, lang) == CLK_CXX11
536 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
537 _cpp_define_builtin (pfile, "__cplusplus 201103L");
538 else
539 _cpp_define_builtin (pfile, "__cplusplus 199711L");
540 }
541 else if (CPP_OPTION (pfile, lang) == CLK_ASM)
542 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
543 else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
544 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
545 else if (CPP_OPTION (pfile, lang) == CLK_STDC17
546 || CPP_OPTION (pfile, lang) == CLK_GNUC17)
547 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");
548 else if (CPP_OPTION (pfile, lang) == CLK_STDC11
549 || CPP_OPTION (pfile, lang) == CLK_GNUC11)
550 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
551 else if (CPP_OPTION (pfile, c99))
552 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
553
554 if (CPP_OPTION (pfile, uliterals)
555 && !(CPP_OPTION (pfile, cplusplus)
556 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX
557 || CPP_OPTION (pfile, lang) == CLK_CXX98)))
558 {
559 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
560 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
561 }
562
563 if (hosted)
564 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
565 else
566 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
567
568 if (CPP_OPTION (pfile, objc))
569 _cpp_define_builtin (pfile, "__OBJC__ 1");
570 }
571
572 /* Sanity-checks are dependent on command-line options, so it is
573 called as a subroutine of cpp_read_main_file. */
574 #if CHECKING_P
575 static void sanity_checks (cpp_reader *);
sanity_checks(cpp_reader * pfile)576 static void sanity_checks (cpp_reader *pfile)
577 {
578 cppchar_t test = 0;
579 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
580
581 /* Sanity checks for assumptions about CPP arithmetic and target
582 type precisions made by cpplib. */
583 test--;
584 if (test < 1)
585 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
586
587 if (CPP_OPTION (pfile, precision) > max_precision)
588 cpp_error (pfile, CPP_DL_ICE,
589 "preprocessor arithmetic has maximum precision of %lu bits;"
590 " target requires %lu bits",
591 (unsigned long) max_precision,
592 (unsigned long) CPP_OPTION (pfile, precision));
593
594 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
595 cpp_error (pfile, CPP_DL_ICE,
596 "CPP arithmetic must be at least as precise as a target int");
597
598 if (CPP_OPTION (pfile, char_precision) < 8)
599 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
600
601 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
602 cpp_error (pfile, CPP_DL_ICE,
603 "target wchar_t is narrower than target char");
604
605 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
606 cpp_error (pfile, CPP_DL_ICE,
607 "target int is narrower than target char");
608
609 /* This is assumed in eval_token() and could be fixed if necessary. */
610 if (sizeof (cppchar_t) > sizeof (cpp_num_part))
611 cpp_error (pfile, CPP_DL_ICE,
612 "CPP half-integer narrower than CPP character");
613
614 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
615 cpp_error (pfile, CPP_DL_ICE,
616 "CPP on this host cannot handle wide character constants over"
617 " %lu bits, but the target requires %lu bits",
618 (unsigned long) BITS_PER_CPPCHAR_T,
619 (unsigned long) CPP_OPTION (pfile, wchar_precision));
620 }
621 #else
622 # define sanity_checks(PFILE)
623 #endif
624
625 /* This is called after options have been parsed, and partially
626 processed. */
627 void
cpp_post_options(cpp_reader * pfile)628 cpp_post_options (cpp_reader *pfile)
629 {
630 int flags;
631
632 sanity_checks (pfile);
633
634 post_options (pfile);
635
636 /* Mark named operators before handling command line macros. */
637 flags = 0;
638 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
639 flags |= NODE_OPERATOR;
640 if (CPP_OPTION (pfile, warn_cxx_operator_names))
641 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
642 if (flags != 0)
643 mark_named_operators (pfile, flags);
644 }
645
646 /* Setup for processing input from the file named FNAME, or stdin if
647 it is the empty string. Return the original filename
648 on success (e.g. foo.i->foo.c), or NULL on failure. */
649 const char *
cpp_read_main_file(cpp_reader * pfile,const char * fname)650 cpp_read_main_file (cpp_reader *pfile, const char *fname)
651 {
652 const source_location loc = 0;
653
654 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
655 {
656 if (!pfile->deps)
657 pfile->deps = deps_init ();
658
659 /* Set the default target (if there is none already). */
660 deps_add_default_target (pfile->deps, fname);
661 }
662
663 pfile->main_file
664 = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0, false,
665 loc);
666 if (_cpp_find_failed (pfile->main_file))
667 return NULL;
668
669 _cpp_stack_file (pfile, pfile->main_file, false, loc);
670
671 /* For foo.i, read the original filename foo.c now, for the benefit
672 of the front ends. */
673 if (CPP_OPTION (pfile, preprocessed))
674 {
675 read_original_filename (pfile);
676 fname =
677 ORDINARY_MAP_FILE_NAME
678 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table)));
679 }
680 return fname;
681 }
682
683 /* For preprocessed files, if the first tokens are of the form # NUM.
684 handle the directive so we know the original file name. This will
685 generate file_change callbacks, which the front ends must handle
686 appropriately given their state of initialization. */
687 static void
read_original_filename(cpp_reader * pfile)688 read_original_filename (cpp_reader *pfile)
689 {
690 const cpp_token *token, *token1;
691
692 /* Lex ahead; if the first tokens are of the form # NUM, then
693 process the directive, otherwise back up. */
694 token = _cpp_lex_direct (pfile);
695 if (token->type == CPP_HASH)
696 {
697 pfile->state.in_directive = 1;
698 token1 = _cpp_lex_direct (pfile);
699 _cpp_backup_tokens (pfile, 1);
700 pfile->state.in_directive = 0;
701
702 /* If it's a #line directive, handle it. */
703 if (token1->type == CPP_NUMBER
704 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE))
705 {
706 read_original_directory (pfile);
707 return;
708 }
709 }
710
711 /* Backup as if nothing happened. */
712 _cpp_backup_tokens (pfile, 1);
713 }
714
715 /* For preprocessed files, if the tokens following the first filename
716 line is of the form # <line> "/path/name//", handle the
717 directive so we know the original current directory. */
718 static void
read_original_directory(cpp_reader * pfile)719 read_original_directory (cpp_reader *pfile)
720 {
721 const cpp_token *hash, *token;
722
723 /* Lex ahead; if the first tokens are of the form # NUM, then
724 process the directive, otherwise back up. */
725 hash = _cpp_lex_direct (pfile);
726 if (hash->type != CPP_HASH)
727 {
728 _cpp_backup_tokens (pfile, 1);
729 return;
730 }
731
732 token = _cpp_lex_direct (pfile);
733
734 if (token->type != CPP_NUMBER)
735 {
736 _cpp_backup_tokens (pfile, 2);
737 return;
738 }
739
740 token = _cpp_lex_direct (pfile);
741
742 if (token->type != CPP_STRING
743 || ! (token->val.str.len >= 5
744 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2])
745 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3])))
746 {
747 _cpp_backup_tokens (pfile, 3);
748 return;
749 }
750
751 if (pfile->cb.dir_change)
752 {
753 char *debugdir = (char *) alloca (token->val.str.len - 3);
754
755 memcpy (debugdir, (const char *) token->val.str.text + 1,
756 token->val.str.len - 4);
757 debugdir[token->val.str.len - 4] = '\0';
758
759 pfile->cb.dir_change (pfile, debugdir);
760 }
761 }
762
763 /* This is called at the end of preprocessing. It pops the last
764 buffer and writes dependency output.
765
766 Maybe it should also reset state, such that you could call
767 cpp_start_read with a new filename to restart processing. */
768 void
cpp_finish(cpp_reader * pfile,FILE * deps_stream)769 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
770 {
771 /* Warn about unused macros before popping the final buffer. */
772 if (CPP_OPTION (pfile, warn_unused_macros))
773 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
774
775 /* lex.c leaves the final buffer on the stack. This it so that
776 it returns an unending stream of CPP_EOFs to the client. If we
777 popped the buffer, we'd dereference a NULL buffer pointer and
778 segfault. It's nice to allow the client to do worry-free excess
779 cpp_get_token calls. */
780 while (pfile->buffer)
781 _cpp_pop_buffer (pfile);
782
783 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
784 && deps_stream)
785 {
786 deps_write (pfile->deps, deps_stream, 72);
787
788 if (CPP_OPTION (pfile, deps.phony_targets))
789 deps_phony_targets (pfile->deps, deps_stream);
790 }
791
792 /* Report on headers that could use multiple include guards. */
793 if (CPP_OPTION (pfile, print_include_names))
794 _cpp_report_missing_guards (pfile);
795 }
796
797 static void
post_options(cpp_reader * pfile)798 post_options (cpp_reader *pfile)
799 {
800 /* -Wtraditional is not useful in C++ mode. */
801 if (CPP_OPTION (pfile, cplusplus))
802 CPP_OPTION (pfile, cpp_warn_traditional) = 0;
803
804 /* Permanently disable macro expansion if we are rescanning
805 preprocessed text. Read preprocesed source in ISO mode. */
806 if (CPP_OPTION (pfile, preprocessed))
807 {
808 if (!CPP_OPTION (pfile, directives_only))
809 pfile->state.prevent_expansion = 1;
810 CPP_OPTION (pfile, traditional) = 0;
811 }
812
813 if (CPP_OPTION (pfile, warn_trigraphs) == 2)
814 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
815
816 if (CPP_OPTION (pfile, traditional))
817 {
818 CPP_OPTION (pfile, trigraphs) = 0;
819 CPP_OPTION (pfile, warn_trigraphs) = 0;
820 }
821 }
822