2014-12-14 Janus Weil <janus@gcc.gnu.org>
[official-gcc.git] / libcpp / init.c
blob2add6ea62de889045773603a48e7eea8d9e92328
1 /* CPP Library.
2 Copyright (C) 1986-2014 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;
95 static const struct lang_flags lang_defaults[] =
96 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig */
97 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
98 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0 },
99 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0 },
100 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1 },
101 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1 },
102 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1 },
103 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1 },
104 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0 },
105 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1 },
106 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0 },
107 /* CXX11 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1 },
108 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 },
109 /* CXX14 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 },
110 /* GNUCXX1Z */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0 },
111 /* CXX1Z */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0 },
112 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
115 /* Sets internal flags correctly for a given language. */
116 void
117 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
119 const struct lang_flags *l = &lang_defaults[(int) lang];
121 CPP_OPTION (pfile, lang) = lang;
123 CPP_OPTION (pfile, c99) = l->c99;
124 CPP_OPTION (pfile, cplusplus) = l->cplusplus;
125 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers;
126 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers;
127 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers;
128 CPP_OPTION (pfile, std) = l->std;
129 CPP_OPTION (pfile, digraphs) = l->digraphs;
130 CPP_OPTION (pfile, uliterals) = l->uliterals;
131 CPP_OPTION (pfile, rliterals) = l->rliterals;
132 CPP_OPTION (pfile, user_literals) = l->user_literals;
133 CPP_OPTION (pfile, binary_constants) = l->binary_constants;
134 CPP_OPTION (pfile, digit_separators) = l->digit_separators;
135 CPP_OPTION (pfile, trigraphs) = l->trigraphs;
138 /* Initialize library global state. */
139 static void
140 init_library (void)
142 static int initialized = 0;
144 if (! initialized)
146 initialized = 1;
148 _cpp_init_lexer ();
150 /* Set up the trigraph map. This doesn't need to do anything if
151 we were compiled with a compiler that supports C99 designated
152 initializers. */
153 init_trigraph_map ();
155 #ifdef ENABLE_NLS
156 (void) bindtextdomain (PACKAGE, LOCALEDIR);
157 #endif
161 /* Initialize a cpp_reader structure. */
162 cpp_reader *
163 cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
164 struct line_maps *line_table)
166 cpp_reader *pfile;
168 /* Initialize this instance of the library if it hasn't been already. */
169 init_library ();
171 pfile = XCNEW (cpp_reader);
172 memset (&pfile->base_context, 0, sizeof (pfile->base_context));
174 cpp_set_lang (pfile, lang);
175 CPP_OPTION (pfile, warn_multichar) = 1;
176 CPP_OPTION (pfile, discard_comments) = 1;
177 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
178 CPP_OPTION (pfile, tabstop) = 8;
179 CPP_OPTION (pfile, operator_names) = 1;
180 CPP_OPTION (pfile, warn_trigraphs) = 2;
181 CPP_OPTION (pfile, warn_endif_labels) = 1;
182 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1;
183 CPP_OPTION (pfile, cpp_warn_deprecated) = 1;
184 CPP_OPTION (pfile, cpp_warn_long_long) = 0;
185 CPP_OPTION (pfile, dollars_in_ident) = 1;
186 CPP_OPTION (pfile, warn_dollars) = 1;
187 CPP_OPTION (pfile, warn_variadic_macros) = 1;
188 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
189 /* By default, track locations of tokens resulting from macro
190 expansion. The '2' means, track the locations with the highest
191 accuracy. Read the comments for struct
192 cpp_options::track_macro_expansion to learn about the other
193 values. */
194 CPP_OPTION (pfile, track_macro_expansion) = 2;
195 CPP_OPTION (pfile, warn_normalize) = normalized_C;
196 CPP_OPTION (pfile, warn_literal_suffix) = 1;
197 CPP_OPTION (pfile, canonical_system_headers)
198 = ENABLE_CANONICAL_SYSTEM_HEADERS;
199 CPP_OPTION (pfile, ext_numeric_literals) = 1;
200 CPP_OPTION (pfile, warn_date_time) = 0;
202 /* Default CPP arithmetic to something sensible for the host for the
203 benefit of dumb users like fix-header. */
204 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
205 CPP_OPTION (pfile, char_precision) = CHAR_BIT;
206 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
207 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
208 CPP_OPTION (pfile, unsigned_char) = 0;
209 CPP_OPTION (pfile, unsigned_wchar) = 1;
210 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */
212 /* Default to no charset conversion. */
213 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
214 CPP_OPTION (pfile, wide_charset) = 0;
216 /* Default the input character set to UTF-8. */
217 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
219 /* A fake empty "directory" used as the starting point for files
220 looked up without a search path. Name cannot be '/' because we
221 don't want to prepend anything at all to filenames using it. All
222 other entries are correct zero-initialized. */
223 pfile->no_search_path.name = (char *) "";
225 /* Initialize the line map. */
226 pfile->line_table = line_table;
228 /* Initialize lexer state. */
229 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
231 /* Set up static tokens. */
232 pfile->avoid_paste.type = CPP_PADDING;
233 pfile->avoid_paste.val.source = NULL;
234 pfile->eof.type = CPP_EOF;
235 pfile->eof.flags = 0;
237 /* Create a token buffer for the lexer. */
238 _cpp_init_tokenrun (&pfile->base_run, 250);
239 pfile->cur_run = &pfile->base_run;
240 pfile->cur_token = pfile->base_run.base;
242 /* Initialize the base context. */
243 pfile->context = &pfile->base_context;
244 pfile->base_context.c.macro = 0;
245 pfile->base_context.prev = pfile->base_context.next = 0;
247 /* Aligned and unaligned storage. */
248 pfile->a_buff = _cpp_get_buff (pfile, 0);
249 pfile->u_buff = _cpp_get_buff (pfile, 0);
251 /* Initialize table for push_macro/pop_macro. */
252 pfile->pushed_macros = 0;
254 /* Do not force token locations by default. */
255 pfile->forced_token_location_p = NULL;
257 /* The expression parser stack. */
258 _cpp_expand_op_stack (pfile);
260 /* Initialize the buffer obstack. */
261 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
263 _cpp_init_files (pfile);
265 _cpp_init_hashtable (pfile, table);
267 return pfile;
270 /* Set the line_table entry in PFILE. This is called after reading a
271 PCH file, as the old line_table will be incorrect. */
272 void
273 cpp_set_line_map (cpp_reader *pfile, struct line_maps *line_table)
275 pfile->line_table = line_table;
278 /* Free resources used by PFILE. Accessing PFILE after this function
279 returns leads to undefined behavior. Returns the error count. */
280 void
281 cpp_destroy (cpp_reader *pfile)
283 cpp_context *context, *contextn;
284 struct def_pragma_macro *pmacro;
285 tokenrun *run, *runn;
286 int i;
288 free (pfile->op_stack);
290 while (CPP_BUFFER (pfile) != NULL)
291 _cpp_pop_buffer (pfile);
293 free (pfile->out.base);
295 if (pfile->macro_buffer)
297 free (pfile->macro_buffer);
298 pfile->macro_buffer = NULL;
299 pfile->macro_buffer_len = 0;
302 if (pfile->deps)
303 deps_free (pfile->deps);
304 obstack_free (&pfile->buffer_ob, 0);
306 _cpp_destroy_hashtable (pfile);
307 _cpp_cleanup_files (pfile);
308 _cpp_destroy_iconv (pfile);
310 _cpp_free_buff (pfile->a_buff);
311 _cpp_free_buff (pfile->u_buff);
312 _cpp_free_buff (pfile->free_buffs);
314 for (run = &pfile->base_run; run; run = runn)
316 runn = run->next;
317 free (run->base);
318 if (run != &pfile->base_run)
319 free (run);
322 for (context = pfile->base_context.next; context; context = contextn)
324 contextn = context->next;
325 free (context);
328 if (pfile->comments.entries)
330 for (i = 0; i < pfile->comments.count; i++)
331 free (pfile->comments.entries[i].comment);
333 free (pfile->comments.entries);
335 if (pfile->pushed_macros)
339 pmacro = pfile->pushed_macros;
340 pfile->pushed_macros = pmacro->next;
341 free (pmacro->name);
342 free (pmacro);
344 while (pfile->pushed_macros);
347 free (pfile);
350 /* This structure defines one built-in identifier. A node will be
351 entered in the hash table under the name NAME, with value VALUE.
353 There are two tables of these. builtin_array holds all the
354 "builtin" macros: these are handled by builtin_macro() in
355 macro.c. Builtin is somewhat of a misnomer -- the property of
356 interest is that these macros require special code to compute their
357 expansions. The value is a "cpp_builtin_type" enumerator.
359 operator_array holds the C++ named operators. These are keywords
360 which act as aliases for punctuators. In C++, they cannot be
361 altered through #define, and #if recognizes them as operators. In
362 C, these are not entered into the hash table at all (but see
363 <iso646.h>). The value is a token-type enumerator. */
364 struct builtin_macro
366 const uchar *const name;
367 const unsigned short len;
368 const unsigned short value;
369 const bool always_warn_if_redefined;
372 #define B(n, t, f) { DSC(n), t, f }
373 static const struct builtin_macro builtin_array[] =
375 B("__TIMESTAMP__", BT_TIMESTAMP, false),
376 B("__TIME__", BT_TIME, false),
377 B("__DATE__", BT_DATE, false),
378 B("__FILE__", BT_FILE, false),
379 B("__BASE_FILE__", BT_BASE_FILE, false),
380 B("__LINE__", BT_SPECLINE, true),
381 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
382 B("__COUNTER__", BT_COUNTER, true),
383 /* Keep builtins not used for -traditional-cpp at the end, and
384 update init_builtins() if any more are added. */
385 B("_Pragma", BT_PRAGMA, true),
386 B("__STDC__", BT_STDC, true),
388 #undef B
390 struct builtin_operator
392 const uchar *const name;
393 const unsigned short len;
394 const unsigned short value;
397 #define B(n, t) { DSC(n), t }
398 static const struct builtin_operator operator_array[] =
400 B("and", CPP_AND_AND),
401 B("and_eq", CPP_AND_EQ),
402 B("bitand", CPP_AND),
403 B("bitor", CPP_OR),
404 B("compl", CPP_COMPL),
405 B("not", CPP_NOT),
406 B("not_eq", CPP_NOT_EQ),
407 B("or", CPP_OR_OR),
408 B("or_eq", CPP_OR_EQ),
409 B("xor", CPP_XOR),
410 B("xor_eq", CPP_XOR_EQ)
412 #undef B
414 /* Mark the C++ named operators in the hash table. */
415 static void
416 mark_named_operators (cpp_reader *pfile, int flags)
418 const struct builtin_operator *b;
420 for (b = operator_array;
421 b < (operator_array + ARRAY_SIZE (operator_array));
422 b++)
424 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
425 hp->flags |= flags;
426 hp->is_directive = 0;
427 hp->directive_index = b->value;
431 /* Helper function of cpp_type2name. Return the string associated with
432 named operator TYPE. */
433 const char *
434 cpp_named_operator2name (enum cpp_ttype type)
436 const struct builtin_operator *b;
438 for (b = operator_array;
439 b < (operator_array + ARRAY_SIZE (operator_array));
440 b++)
442 if (type == b->value)
443 return (const char *) b->name;
446 return NULL;
449 void
450 cpp_init_special_builtins (cpp_reader *pfile)
452 const struct builtin_macro *b;
453 size_t n = ARRAY_SIZE (builtin_array);
455 if (CPP_OPTION (pfile, traditional))
456 n -= 2;
457 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
458 || CPP_OPTION (pfile, std))
459 n--;
461 for (b = builtin_array; b < builtin_array + n; b++)
463 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
464 hp->type = NT_MACRO;
465 hp->flags |= NODE_BUILTIN;
466 if (b->always_warn_if_redefined)
467 hp->flags |= NODE_WARN;
468 hp->value.builtin = (enum cpp_builtin_type) b->value;
472 /* Read the builtins table above and enter them, and language-specific
473 macros, into the hash table. HOSTED is true if this is a hosted
474 environment. */
475 void
476 cpp_init_builtins (cpp_reader *pfile, int hosted)
478 cpp_init_special_builtins (pfile);
480 if (!CPP_OPTION (pfile, traditional)
481 && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
482 || CPP_OPTION (pfile, std)))
483 _cpp_define_builtin (pfile, "__STDC__ 1");
485 if (CPP_OPTION (pfile, cplusplus))
487 if (CPP_OPTION (pfile, lang) == CLK_CXX1Z
488 || CPP_OPTION (pfile, lang) == CLK_GNUCXX1Z)
489 _cpp_define_builtin (pfile, "__cplusplus 201500L");
490 else if (CPP_OPTION (pfile, lang) == CLK_CXX14
491 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
492 _cpp_define_builtin (pfile, "__cplusplus 201402L");
493 else if (CPP_OPTION (pfile, lang) == CLK_CXX11
494 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
495 _cpp_define_builtin (pfile, "__cplusplus 201103L");
496 else
497 _cpp_define_builtin (pfile, "__cplusplus 199711L");
499 else if (CPP_OPTION (pfile, lang) == CLK_ASM)
500 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
501 else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
502 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
503 else if (CPP_OPTION (pfile, lang) == CLK_STDC11
504 || CPP_OPTION (pfile, lang) == CLK_GNUC11)
505 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
506 else if (CPP_OPTION (pfile, c99))
507 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
509 if (CPP_OPTION (pfile, uliterals)
510 && !(CPP_OPTION (pfile, cplusplus)
511 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX
512 || CPP_OPTION (pfile, lang) == CLK_CXX98)))
514 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
515 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
518 if (hosted)
519 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
520 else
521 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
523 if (CPP_OPTION (pfile, objc))
524 _cpp_define_builtin (pfile, "__OBJC__ 1");
527 /* Sanity-checks are dependent on command-line options, so it is
528 called as a subroutine of cpp_read_main_file (). */
529 #if ENABLE_CHECKING
530 static void sanity_checks (cpp_reader *);
531 static void sanity_checks (cpp_reader *pfile)
533 cppchar_t test = 0;
534 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
536 /* Sanity checks for assumptions about CPP arithmetic and target
537 type precisions made by cpplib. */
538 test--;
539 if (test < 1)
540 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
542 if (CPP_OPTION (pfile, precision) > max_precision)
543 cpp_error (pfile, CPP_DL_ICE,
544 "preprocessor arithmetic has maximum precision of %lu bits;"
545 " target requires %lu bits",
546 (unsigned long) max_precision,
547 (unsigned long) CPP_OPTION (pfile, precision));
549 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
550 cpp_error (pfile, CPP_DL_ICE,
551 "CPP arithmetic must be at least as precise as a target int");
553 if (CPP_OPTION (pfile, char_precision) < 8)
554 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
556 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
557 cpp_error (pfile, CPP_DL_ICE,
558 "target wchar_t is narrower than target char");
560 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
561 cpp_error (pfile, CPP_DL_ICE,
562 "target int is narrower than target char");
564 /* This is assumed in eval_token() and could be fixed if necessary. */
565 if (sizeof (cppchar_t) > sizeof (cpp_num_part))
566 cpp_error (pfile, CPP_DL_ICE,
567 "CPP half-integer narrower than CPP character");
569 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
570 cpp_error (pfile, CPP_DL_ICE,
571 "CPP on this host cannot handle wide character constants over"
572 " %lu bits, but the target requires %lu bits",
573 (unsigned long) BITS_PER_CPPCHAR_T,
574 (unsigned long) CPP_OPTION (pfile, wchar_precision));
576 #else
577 # define sanity_checks(PFILE)
578 #endif
580 /* This is called after options have been parsed, and partially
581 processed. */
582 void
583 cpp_post_options (cpp_reader *pfile)
585 int flags;
587 sanity_checks (pfile);
589 post_options (pfile);
591 /* Mark named operators before handling command line macros. */
592 flags = 0;
593 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
594 flags |= NODE_OPERATOR;
595 if (CPP_OPTION (pfile, warn_cxx_operator_names))
596 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
597 if (flags != 0)
598 mark_named_operators (pfile, flags);
601 /* Setup for processing input from the file named FNAME, or stdin if
602 it is the empty string. Return the original filename
603 on success (e.g. foo.i->foo.c), or NULL on failure. */
604 const char *
605 cpp_read_main_file (cpp_reader *pfile, const char *fname)
607 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
609 if (!pfile->deps)
610 pfile->deps = deps_init ();
612 /* Set the default target (if there is none already). */
613 deps_add_default_target (pfile->deps, fname);
616 pfile->main_file
617 = _cpp_find_file (pfile, fname, &pfile->no_search_path, false, 0, false);
618 if (_cpp_find_failed (pfile->main_file))
619 return NULL;
621 _cpp_stack_file (pfile, pfile->main_file, false);
623 /* For foo.i, read the original filename foo.c now, for the benefit
624 of the front ends. */
625 if (CPP_OPTION (pfile, preprocessed))
627 read_original_filename (pfile);
628 fname =
629 ORDINARY_MAP_FILE_NAME
630 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table)));
632 return fname;
635 /* For preprocessed files, if the first tokens are of the form # NUM.
636 handle the directive so we know the original file name. This will
637 generate file_change callbacks, which the front ends must handle
638 appropriately given their state of initialization. */
639 static void
640 read_original_filename (cpp_reader *pfile)
642 const cpp_token *token, *token1;
644 /* Lex ahead; if the first tokens are of the form # NUM, then
645 process the directive, otherwise back up. */
646 token = _cpp_lex_direct (pfile);
647 if (token->type == CPP_HASH)
649 pfile->state.in_directive = 1;
650 token1 = _cpp_lex_direct (pfile);
651 _cpp_backup_tokens (pfile, 1);
652 pfile->state.in_directive = 0;
654 /* If it's a #line directive, handle it. */
655 if (token1->type == CPP_NUMBER
656 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE))
658 read_original_directory (pfile);
659 return;
663 /* Backup as if nothing happened. */
664 _cpp_backup_tokens (pfile, 1);
667 /* For preprocessed files, if the tokens following the first filename
668 line is of the form # <line> "/path/name//", handle the
669 directive so we know the original current directory. */
670 static void
671 read_original_directory (cpp_reader *pfile)
673 const cpp_token *hash, *token;
675 /* Lex ahead; if the first tokens are of the form # NUM, then
676 process the directive, otherwise back up. */
677 hash = _cpp_lex_direct (pfile);
678 if (hash->type != CPP_HASH)
680 _cpp_backup_tokens (pfile, 1);
681 return;
684 token = _cpp_lex_direct (pfile);
686 if (token->type != CPP_NUMBER)
688 _cpp_backup_tokens (pfile, 2);
689 return;
692 token = _cpp_lex_direct (pfile);
694 if (token->type != CPP_STRING
695 || ! (token->val.str.len >= 5
696 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2])
697 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3])))
699 _cpp_backup_tokens (pfile, 3);
700 return;
703 if (pfile->cb.dir_change)
705 char *debugdir = (char *) alloca (token->val.str.len - 3);
707 memcpy (debugdir, (const char *) token->val.str.text + 1,
708 token->val.str.len - 4);
709 debugdir[token->val.str.len - 4] = '\0';
711 pfile->cb.dir_change (pfile, debugdir);
715 /* This is called at the end of preprocessing. It pops the last
716 buffer and writes dependency output.
718 Maybe it should also reset state, such that you could call
719 cpp_start_read with a new filename to restart processing. */
720 void
721 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
723 /* Warn about unused macros before popping the final buffer. */
724 if (CPP_OPTION (pfile, warn_unused_macros))
725 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
727 /* lex.c leaves the final buffer on the stack. This it so that
728 it returns an unending stream of CPP_EOFs to the client. If we
729 popped the buffer, we'd dereference a NULL buffer pointer and
730 segfault. It's nice to allow the client to do worry-free excess
731 cpp_get_token calls. */
732 while (pfile->buffer)
733 _cpp_pop_buffer (pfile);
735 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
736 && deps_stream)
738 deps_write (pfile->deps, deps_stream, 72);
740 if (CPP_OPTION (pfile, deps.phony_targets))
741 deps_phony_targets (pfile->deps, deps_stream);
744 /* Report on headers that could use multiple include guards. */
745 if (CPP_OPTION (pfile, print_include_names))
746 _cpp_report_missing_guards (pfile);
749 static void
750 post_options (cpp_reader *pfile)
752 /* -Wtraditional is not useful in C++ mode. */
753 if (CPP_OPTION (pfile, cplusplus))
754 CPP_OPTION (pfile, cpp_warn_traditional) = 0;
756 /* Permanently disable macro expansion if we are rescanning
757 preprocessed text. Read preprocesed source in ISO mode. */
758 if (CPP_OPTION (pfile, preprocessed))
760 if (!CPP_OPTION (pfile, directives_only))
761 pfile->state.prevent_expansion = 1;
762 CPP_OPTION (pfile, traditional) = 0;
765 if (CPP_OPTION (pfile, warn_trigraphs) == 2)
766 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
768 if (CPP_OPTION (pfile, traditional))
770 CPP_OPTION (pfile, trigraphs) = 0;
771 CPP_OPTION (pfile, warn_trigraphs) = 0;