Daily bump.
[official-gcc.git] / libcpp / init.c
blobd1697fdec1c440b8e1b10aaca8fcde16c541faef
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
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.
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.
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/>. */
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"
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
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 *);
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
48 #define init_trigraph_map() /* Nothing. */
49 #define TRIGRAPH_MAP \
50 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
52 #define END };
53 #define s(p, v) [p] = v,
55 #else
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;
61 #define END }
62 #define s(p, v) x[p] = v;
64 #endif
66 TRIGRAPH_MAP
67 s('=', '#') s(')', ']') s('!', '|')
68 s('(', '[') s('\'', '^') s('>', '}')
69 s('/', '\\') s('<', '{') s('-', '~')
70 END
72 #undef s
73 #undef END
74 #undef TRIGRAPH_MAP
76 /* A set of booleans indicating what CPP features each source language
77 requires. */
78 struct lang_flags
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;
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 }
121 /* Sets internal flags correctly for a given language. */
122 void
123 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
125 const struct lang_flags *l = &lang_defaults[(int) lang];
127 CPP_OPTION (pfile, lang) = lang;
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;
146 /* Initialize library global state. */
147 static void
148 init_library (void)
150 static int initialized = 0;
152 if (! initialized)
154 initialized = 1;
156 _cpp_init_lexer ();
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 ();
163 #ifdef ENABLE_NLS
164 (void) bindtextdomain (PACKAGE, LOCALEDIR);
165 #endif
169 /* Initialize a cpp_reader structure. */
170 cpp_reader *
171 cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
172 struct line_maps *line_table)
174 cpp_reader *pfile;
176 /* Initialize this instance of the library if it hasn't been already. */
177 init_library ();
179 pfile = XCNEW (cpp_reader);
180 memset (&pfile->base_context, 0, sizeof (pfile->base_context));
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;
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 */
222 /* Default to no charset conversion. */
223 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
224 CPP_OPTION (pfile, wide_charset) = 0;
226 /* Default the input character set to UTF-8. */
227 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
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 *) "";
235 /* Initialize the line map. */
236 pfile->line_table = line_table;
238 /* Initialize lexer state. */
239 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
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;
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;
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;
257 /* Aligned and unaligned storage. */
258 pfile->a_buff = _cpp_get_buff (pfile, 0);
259 pfile->u_buff = _cpp_get_buff (pfile, 0);
261 /* Initialize table for push_macro/pop_macro. */
262 pfile->pushed_macros = 0;
264 /* Do not force token locations by default. */
265 pfile->forced_token_location_p = NULL;
267 /* Initialize source_date_epoch to -2 (not yet set). */
268 pfile->source_date_epoch = (time_t) -2;
270 /* The expression parser stack. */
271 _cpp_expand_op_stack (pfile);
273 /* Initialize the buffer obstack. */
274 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
276 _cpp_init_files (pfile);
278 _cpp_init_hashtable (pfile, table);
280 return pfile;
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
286 cpp_set_line_map (cpp_reader *pfile, struct line_maps *line_table)
288 pfile->line_table = line_table;
291 /* Free resources used by PFILE. Accessing PFILE after this function
292 returns leads to undefined behavior. Returns the error count. */
293 void
294 cpp_destroy (cpp_reader *pfile)
296 cpp_context *context, *contextn;
297 struct def_pragma_macro *pmacro;
298 tokenrun *run, *runn;
299 int i;
301 free (pfile->op_stack);
303 while (CPP_BUFFER (pfile) != NULL)
304 _cpp_pop_buffer (pfile);
306 free (pfile->out.base);
308 if (pfile->macro_buffer)
310 free (pfile->macro_buffer);
311 pfile->macro_buffer = NULL;
312 pfile->macro_buffer_len = 0;
315 if (pfile->deps)
316 deps_free (pfile->deps);
317 obstack_free (&pfile->buffer_ob, 0);
319 _cpp_destroy_hashtable (pfile);
320 _cpp_cleanup_files (pfile);
321 _cpp_destroy_iconv (pfile);
323 _cpp_free_buff (pfile->a_buff);
324 _cpp_free_buff (pfile->u_buff);
325 _cpp_free_buff (pfile->free_buffs);
327 for (run = &pfile->base_run; run; run = runn)
329 runn = run->next;
330 free (run->base);
331 if (run != &pfile->base_run)
332 free (run);
335 for (context = pfile->base_context.next; context; context = contextn)
337 contextn = context->next;
338 free (context);
341 if (pfile->comments.entries)
343 for (i = 0; i < pfile->comments.count; i++)
344 free (pfile->comments.entries[i].comment);
346 free (pfile->comments.entries);
348 if (pfile->pushed_macros)
352 pmacro = pfile->pushed_macros;
353 pfile->pushed_macros = pmacro->next;
354 free (pmacro->name);
355 free (pmacro);
357 while (pfile->pushed_macros);
360 free (pfile);
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.
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.
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
379 const uchar *const name;
380 const unsigned short len;
381 const unsigned short value;
382 const bool always_warn_if_redefined;
385 #define B(n, t, f) { DSC(n), t, f }
386 static const struct builtin_macro builtin_array[] =
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),
403 #undef B
405 struct builtin_operator
407 const uchar *const name;
408 const unsigned short len;
409 const unsigned short value;
412 #define B(n, t) { DSC(n), t }
413 static const struct builtin_operator operator_array[] =
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)
427 #undef B
429 /* Mark the C++ named operators in the hash table. */
430 static void
431 mark_named_operators (cpp_reader *pfile, int flags)
433 const struct builtin_operator *b;
435 for (b = operator_array;
436 b < (operator_array + ARRAY_SIZE (operator_array));
437 b++)
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;
446 /* Helper function of cpp_type2name. Return the string associated with
447 named operator TYPE. */
448 const char *
449 cpp_named_operator2name (enum cpp_ttype type)
451 const struct builtin_operator *b;
453 for (b = operator_array;
454 b < (operator_array + ARRAY_SIZE (operator_array));
455 b++)
457 if (type == b->value)
458 return (const char *) b->name;
461 return NULL;
464 void
465 cpp_init_special_builtins (cpp_reader *pfile)
467 const struct builtin_macro *b;
468 size_t n = ARRAY_SIZE (builtin_array);
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--;
476 for (b = builtin_array; b < builtin_array + n; b++)
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;
491 /* Read the builtins table above and enter them, and language-specific
492 macros, into the hash table. HOSTED is true if this is a hosted
493 environment. */
494 void
495 cpp_init_builtins (cpp_reader *pfile, int hosted)
497 cpp_init_special_builtins (pfile);
499 if (!CPP_OPTION (pfile, traditional)
500 && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
501 || CPP_OPTION (pfile, std)))
502 _cpp_define_builtin (pfile, "__STDC__ 1");
504 if (CPP_OPTION (pfile, cplusplus))
506 if (CPP_OPTION (pfile, lang) == CLK_CXX2A
507 || CPP_OPTION (pfile, lang) == CLK_GNUCXX2A)
508 _cpp_define_builtin (pfile, "__cplusplus 201709L");
509 else if (CPP_OPTION (pfile, lang) == CLK_CXX17
510 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
511 _cpp_define_builtin (pfile, "__cplusplus 201703L");
512 else if (CPP_OPTION (pfile, lang) == CLK_CXX14
513 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
514 _cpp_define_builtin (pfile, "__cplusplus 201402L");
515 else if (CPP_OPTION (pfile, lang) == CLK_CXX11
516 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
517 _cpp_define_builtin (pfile, "__cplusplus 201103L");
518 else
519 _cpp_define_builtin (pfile, "__cplusplus 199711L");
521 else if (CPP_OPTION (pfile, lang) == CLK_ASM)
522 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
523 else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
524 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
525 else if (CPP_OPTION (pfile, lang) == CLK_STDC17
526 || CPP_OPTION (pfile, lang) == CLK_GNUC17)
527 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");
528 else if (CPP_OPTION (pfile, lang) == CLK_STDC11
529 || CPP_OPTION (pfile, lang) == CLK_GNUC11)
530 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
531 else if (CPP_OPTION (pfile, c99))
532 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
534 if (CPP_OPTION (pfile, uliterals)
535 && !(CPP_OPTION (pfile, cplusplus)
536 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX
537 || CPP_OPTION (pfile, lang) == CLK_CXX98)))
539 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
540 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
543 if (hosted)
544 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
545 else
546 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
548 if (CPP_OPTION (pfile, objc))
549 _cpp_define_builtin (pfile, "__OBJC__ 1");
552 /* Sanity-checks are dependent on command-line options, so it is
553 called as a subroutine of cpp_read_main_file. */
554 #if CHECKING_P
555 static void sanity_checks (cpp_reader *);
556 static void sanity_checks (cpp_reader *pfile)
558 cppchar_t test = 0;
559 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
561 /* Sanity checks for assumptions about CPP arithmetic and target
562 type precisions made by cpplib. */
563 test--;
564 if (test < 1)
565 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
567 if (CPP_OPTION (pfile, precision) > max_precision)
568 cpp_error (pfile, CPP_DL_ICE,
569 "preprocessor arithmetic has maximum precision of %lu bits;"
570 " target requires %lu bits",
571 (unsigned long) max_precision,
572 (unsigned long) CPP_OPTION (pfile, precision));
574 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
575 cpp_error (pfile, CPP_DL_ICE,
576 "CPP arithmetic must be at least as precise as a target int");
578 if (CPP_OPTION (pfile, char_precision) < 8)
579 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
581 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
582 cpp_error (pfile, CPP_DL_ICE,
583 "target wchar_t is narrower than target char");
585 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
586 cpp_error (pfile, CPP_DL_ICE,
587 "target int is narrower than target char");
589 /* This is assumed in eval_token() and could be fixed if necessary. */
590 if (sizeof (cppchar_t) > sizeof (cpp_num_part))
591 cpp_error (pfile, CPP_DL_ICE,
592 "CPP half-integer narrower than CPP character");
594 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
595 cpp_error (pfile, CPP_DL_ICE,
596 "CPP on this host cannot handle wide character constants over"
597 " %lu bits, but the target requires %lu bits",
598 (unsigned long) BITS_PER_CPPCHAR_T,
599 (unsigned long) CPP_OPTION (pfile, wchar_precision));
601 #else
602 # define sanity_checks(PFILE)
603 #endif
605 /* This is called after options have been parsed, and partially
606 processed. */
607 void
608 cpp_post_options (cpp_reader *pfile)
610 int flags;
612 sanity_checks (pfile);
614 post_options (pfile);
616 /* Mark named operators before handling command line macros. */
617 flags = 0;
618 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
619 flags |= NODE_OPERATOR;
620 if (CPP_OPTION (pfile, warn_cxx_operator_names))
621 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
622 if (flags != 0)
623 mark_named_operators (pfile, flags);
626 /* Setup for processing input from the file named FNAME, or stdin if
627 it is the empty string. Return the original filename
628 on success (e.g. foo.i->foo.c), or NULL on failure. */
629 const char *
630 cpp_read_main_file (cpp_reader *pfile, const char *fname)
632 const source_location loc = 0;
634 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
636 if (!pfile->deps)
637 pfile->deps = deps_init ();
639 /* Set the default target (if there is none already). */
640 deps_add_default_target (pfile->deps, fname);
643 pfile->main_file
644 = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0, false,
645 loc);
646 if (_cpp_find_failed (pfile->main_file))
647 return NULL;
649 _cpp_stack_file (pfile, pfile->main_file, false, loc);
651 /* For foo.i, read the original filename foo.c now, for the benefit
652 of the front ends. */
653 if (CPP_OPTION (pfile, preprocessed))
655 read_original_filename (pfile);
656 fname =
657 ORDINARY_MAP_FILE_NAME
658 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table)));
660 return fname;
663 /* For preprocessed files, if the first tokens are of the form # NUM.
664 handle the directive so we know the original file name. This will
665 generate file_change callbacks, which the front ends must handle
666 appropriately given their state of initialization. */
667 static void
668 read_original_filename (cpp_reader *pfile)
670 const cpp_token *token, *token1;
672 /* Lex ahead; if the first tokens are of the form # NUM, then
673 process the directive, otherwise back up. */
674 token = _cpp_lex_direct (pfile);
675 if (token->type == CPP_HASH)
677 pfile->state.in_directive = 1;
678 token1 = _cpp_lex_direct (pfile);
679 _cpp_backup_tokens (pfile, 1);
680 pfile->state.in_directive = 0;
682 /* If it's a #line directive, handle it. */
683 if (token1->type == CPP_NUMBER
684 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE))
686 read_original_directory (pfile);
687 return;
691 /* Backup as if nothing happened. */
692 _cpp_backup_tokens (pfile, 1);
695 /* For preprocessed files, if the tokens following the first filename
696 line is of the form # <line> "/path/name//", handle the
697 directive so we know the original current directory. */
698 static void
699 read_original_directory (cpp_reader *pfile)
701 const cpp_token *hash, *token;
703 /* Lex ahead; if the first tokens are of the form # NUM, then
704 process the directive, otherwise back up. */
705 hash = _cpp_lex_direct (pfile);
706 if (hash->type != CPP_HASH)
708 _cpp_backup_tokens (pfile, 1);
709 return;
712 token = _cpp_lex_direct (pfile);
714 if (token->type != CPP_NUMBER)
716 _cpp_backup_tokens (pfile, 2);
717 return;
720 token = _cpp_lex_direct (pfile);
722 if (token->type != CPP_STRING
723 || ! (token->val.str.len >= 5
724 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2])
725 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3])))
727 _cpp_backup_tokens (pfile, 3);
728 return;
731 if (pfile->cb.dir_change)
733 char *debugdir = (char *) alloca (token->val.str.len - 3);
735 memcpy (debugdir, (const char *) token->val.str.text + 1,
736 token->val.str.len - 4);
737 debugdir[token->val.str.len - 4] = '\0';
739 pfile->cb.dir_change (pfile, debugdir);
743 /* This is called at the end of preprocessing. It pops the last
744 buffer and writes dependency output.
746 Maybe it should also reset state, such that you could call
747 cpp_start_read with a new filename to restart processing. */
748 void
749 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
751 /* Warn about unused macros before popping the final buffer. */
752 if (CPP_OPTION (pfile, warn_unused_macros))
753 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
755 /* lex.c leaves the final buffer on the stack. This it so that
756 it returns an unending stream of CPP_EOFs to the client. If we
757 popped the buffer, we'd dereference a NULL buffer pointer and
758 segfault. It's nice to allow the client to do worry-free excess
759 cpp_get_token calls. */
760 while (pfile->buffer)
761 _cpp_pop_buffer (pfile);
763 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
764 && deps_stream)
766 deps_write (pfile->deps, deps_stream, 72);
768 if (CPP_OPTION (pfile, deps.phony_targets))
769 deps_phony_targets (pfile->deps, deps_stream);
772 /* Report on headers that could use multiple include guards. */
773 if (CPP_OPTION (pfile, print_include_names))
774 _cpp_report_missing_guards (pfile);
777 static void
778 post_options (cpp_reader *pfile)
780 /* -Wtraditional is not useful in C++ mode. */
781 if (CPP_OPTION (pfile, cplusplus))
782 CPP_OPTION (pfile, cpp_warn_traditional) = 0;
784 /* Permanently disable macro expansion if we are rescanning
785 preprocessed text. Read preprocesed source in ISO mode. */
786 if (CPP_OPTION (pfile, preprocessed))
788 if (!CPP_OPTION (pfile, directives_only))
789 pfile->state.prevent_expansion = 1;
790 CPP_OPTION (pfile, traditional) = 0;
793 if (CPP_OPTION (pfile, warn_trigraphs) == 2)
794 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
796 if (CPP_OPTION (pfile, traditional))
798 CPP_OPTION (pfile, trigraphs) = 0;
799 CPP_OPTION (pfile, warn_trigraphs) = 0;