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[official-gcc.git] / libcpp / init.c
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1 /* CPP Library.
2 Copyright (C) 1986-2020 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;
95 char scope;
96 char dfp_constants;
99 static const struct lang_flags lang_defaults[] =
100 { /* c99 c++ xnum xid c11 std digr ulit rlit udlit bincst digsep trig u8chlit vaopt scope dfp */
101 /* GNUC89 */ { 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
102 /* GNUC99 */ { 1, 0, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
103 /* GNUC11 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
104 /* GNUC17 */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0 },
105 /* GNUC2X */ { 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1 },
106 /* STDC89 */ { 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
107 /* STDC94 */ { 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
108 /* STDC99 */ { 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
109 /* STDC11 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
110 /* STDC17 */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0 },
111 /* STDC2X */ { 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0, 1, 1 },
112 /* GNUCXX */ { 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0 },
113 /* CXX98 */ { 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0 },
114 /* GNUCXX11 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0 },
115 /* CXX11 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0, 0, 1, 0 },
116 /* GNUCXX14 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0, 1, 1, 0 },
117 /* CXX14 */ { 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1, 0 },
118 /* GNUCXX17 */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
119 /* CXX17 */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 0, 1, 0 },
120 /* GNUCXX2A */ { 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
121 /* CXX2A */ { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 0 },
122 /* ASM */ { 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
125 /* Sets internal flags correctly for a given language. */
126 void
127 cpp_set_lang (cpp_reader *pfile, enum c_lang lang)
129 const struct lang_flags *l = &lang_defaults[(int) lang];
131 CPP_OPTION (pfile, lang) = lang;
133 CPP_OPTION (pfile, c99) = l->c99;
134 CPP_OPTION (pfile, cplusplus) = l->cplusplus;
135 CPP_OPTION (pfile, extended_numbers) = l->extended_numbers;
136 CPP_OPTION (pfile, extended_identifiers) = l->extended_identifiers;
137 CPP_OPTION (pfile, c11_identifiers) = l->c11_identifiers;
138 CPP_OPTION (pfile, std) = l->std;
139 CPP_OPTION (pfile, digraphs) = l->digraphs;
140 CPP_OPTION (pfile, uliterals) = l->uliterals;
141 CPP_OPTION (pfile, rliterals) = l->rliterals;
142 CPP_OPTION (pfile, user_literals) = l->user_literals;
143 CPP_OPTION (pfile, binary_constants) = l->binary_constants;
144 CPP_OPTION (pfile, digit_separators) = l->digit_separators;
145 CPP_OPTION (pfile, trigraphs) = l->trigraphs;
146 CPP_OPTION (pfile, utf8_char_literals) = l->utf8_char_literals;
147 CPP_OPTION (pfile, va_opt) = l->va_opt;
148 CPP_OPTION (pfile, scope) = l->scope;
149 CPP_OPTION (pfile, dfp_constants) = l->dfp_constants;
152 /* Initialize library global state. */
153 static void
154 init_library (void)
156 static int initialized = 0;
158 if (! initialized)
160 initialized = 1;
162 _cpp_init_lexer ();
164 /* Set up the trigraph map. This doesn't need to do anything if
165 we were compiled with a compiler that supports C99 designated
166 initializers. */
167 init_trigraph_map ();
169 #ifdef ENABLE_NLS
170 (void) bindtextdomain (PACKAGE, LOCALEDIR);
171 #endif
175 /* Initialize a cpp_reader structure. */
176 cpp_reader *
177 cpp_create_reader (enum c_lang lang, cpp_hash_table *table,
178 class line_maps *line_table)
180 cpp_reader *pfile;
182 /* Initialize this instance of the library if it hasn't been already. */
183 init_library ();
185 pfile = XCNEW (cpp_reader);
186 memset (&pfile->base_context, 0, sizeof (pfile->base_context));
188 cpp_set_lang (pfile, lang);
189 CPP_OPTION (pfile, warn_multichar) = 1;
190 CPP_OPTION (pfile, discard_comments) = 1;
191 CPP_OPTION (pfile, discard_comments_in_macro_exp) = 1;
192 CPP_OPTION (pfile, max_include_depth) = 200;
193 CPP_OPTION (pfile, tabstop) = 8;
194 CPP_OPTION (pfile, operator_names) = 1;
195 CPP_OPTION (pfile, warn_trigraphs) = 2;
196 CPP_OPTION (pfile, warn_endif_labels) = 1;
197 CPP_OPTION (pfile, cpp_warn_c90_c99_compat) = -1;
198 CPP_OPTION (pfile, cpp_warn_c11_c2x_compat) = -1;
199 CPP_OPTION (pfile, cpp_warn_cxx11_compat) = 0;
200 CPP_OPTION (pfile, cpp_warn_deprecated) = 1;
201 CPP_OPTION (pfile, cpp_warn_long_long) = 0;
202 CPP_OPTION (pfile, dollars_in_ident) = 1;
203 CPP_OPTION (pfile, warn_dollars) = 1;
204 CPP_OPTION (pfile, warn_variadic_macros) = 1;
205 CPP_OPTION (pfile, warn_builtin_macro_redefined) = 1;
206 CPP_OPTION (pfile, cpp_warn_implicit_fallthrough) = 0;
207 /* By default, track locations of tokens resulting from macro
208 expansion. The '2' means, track the locations with the highest
209 accuracy. Read the comments for struct
210 cpp_options::track_macro_expansion to learn about the other
211 values. */
212 CPP_OPTION (pfile, track_macro_expansion) = 2;
213 CPP_OPTION (pfile, warn_normalize) = normalized_C;
214 CPP_OPTION (pfile, warn_literal_suffix) = 1;
215 CPP_OPTION (pfile, canonical_system_headers)
216 = ENABLE_CANONICAL_SYSTEM_HEADERS;
217 CPP_OPTION (pfile, ext_numeric_literals) = 1;
218 CPP_OPTION (pfile, warn_date_time) = 0;
220 /* Default CPP arithmetic to something sensible for the host for the
221 benefit of dumb users like fix-header. */
222 CPP_OPTION (pfile, precision) = CHAR_BIT * sizeof (long);
223 CPP_OPTION (pfile, char_precision) = CHAR_BIT;
224 CPP_OPTION (pfile, wchar_precision) = CHAR_BIT * sizeof (int);
225 CPP_OPTION (pfile, int_precision) = CHAR_BIT * sizeof (int);
226 CPP_OPTION (pfile, unsigned_char) = 0;
227 CPP_OPTION (pfile, unsigned_wchar) = 1;
228 CPP_OPTION (pfile, bytes_big_endian) = 1; /* does not matter */
230 /* Default to no charset conversion. */
231 CPP_OPTION (pfile, narrow_charset) = _cpp_default_encoding ();
232 CPP_OPTION (pfile, wide_charset) = 0;
234 /* Default the input character set to UTF-8. */
235 CPP_OPTION (pfile, input_charset) = _cpp_default_encoding ();
237 /* A fake empty "directory" used as the starting point for files
238 looked up without a search path. Name cannot be '/' because we
239 don't want to prepend anything at all to filenames using it. All
240 other entries are correct zero-initialized. */
241 pfile->no_search_path.name = (char *) "";
243 /* Initialize the line map. */
244 pfile->line_table = line_table;
246 /* Initialize lexer state. */
247 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
249 /* Set up static tokens. */
250 pfile->avoid_paste.type = CPP_PADDING;
251 pfile->avoid_paste.val.source = NULL;
252 pfile->eof.type = CPP_EOF;
253 pfile->eof.flags = 0;
255 /* Create a token buffer for the lexer. */
256 _cpp_init_tokenrun (&pfile->base_run, 250);
257 pfile->cur_run = &pfile->base_run;
258 pfile->cur_token = pfile->base_run.base;
260 /* Initialize the base context. */
261 pfile->context = &pfile->base_context;
262 pfile->base_context.c.macro = 0;
263 pfile->base_context.prev = pfile->base_context.next = 0;
265 /* Aligned and unaligned storage. */
266 pfile->a_buff = _cpp_get_buff (pfile, 0);
267 pfile->u_buff = _cpp_get_buff (pfile, 0);
269 /* Initialize table for push_macro/pop_macro. */
270 pfile->pushed_macros = 0;
272 /* Do not force token locations by default. */
273 pfile->forced_token_location = 0;
275 /* Initialize source_date_epoch to -2 (not yet set). */
276 pfile->source_date_epoch = (time_t) -2;
278 /* The expression parser stack. */
279 _cpp_expand_op_stack (pfile);
281 /* Initialize the buffer obstack. */
282 obstack_specify_allocation (&pfile->buffer_ob, 0, 0, xmalloc, free);
284 _cpp_init_files (pfile);
286 _cpp_init_hashtable (pfile, table);
288 return pfile;
291 /* Set the line_table entry in PFILE. This is called after reading a
292 PCH file, as the old line_table will be incorrect. */
293 void
294 cpp_set_line_map (cpp_reader *pfile, class line_maps *line_table)
296 pfile->line_table = line_table;
299 /* Free resources used by PFILE. Accessing PFILE after this function
300 returns leads to undefined behavior. Returns the error count. */
301 void
302 cpp_destroy (cpp_reader *pfile)
304 cpp_context *context, *contextn;
305 struct def_pragma_macro *pmacro;
306 tokenrun *run, *runn;
307 int i;
309 free (pfile->op_stack);
311 while (CPP_BUFFER (pfile) != NULL)
312 _cpp_pop_buffer (pfile);
314 free (pfile->out.base);
316 if (pfile->macro_buffer)
318 free (pfile->macro_buffer);
319 pfile->macro_buffer = NULL;
320 pfile->macro_buffer_len = 0;
323 if (pfile->deps)
324 deps_free (pfile->deps);
325 obstack_free (&pfile->buffer_ob, 0);
327 _cpp_destroy_hashtable (pfile);
328 _cpp_cleanup_files (pfile);
329 _cpp_destroy_iconv (pfile);
331 _cpp_free_buff (pfile->a_buff);
332 _cpp_free_buff (pfile->u_buff);
333 _cpp_free_buff (pfile->free_buffs);
335 for (run = &pfile->base_run; run; run = runn)
337 runn = run->next;
338 free (run->base);
339 if (run != &pfile->base_run)
340 free (run);
343 for (context = pfile->base_context.next; context; context = contextn)
345 contextn = context->next;
346 free (context);
349 if (pfile->comments.entries)
351 for (i = 0; i < pfile->comments.count; i++)
352 free (pfile->comments.entries[i].comment);
354 free (pfile->comments.entries);
356 if (pfile->pushed_macros)
360 pmacro = pfile->pushed_macros;
361 pfile->pushed_macros = pmacro->next;
362 free (pmacro->name);
363 free (pmacro);
365 while (pfile->pushed_macros);
368 free (pfile);
371 /* This structure defines one built-in identifier. A node will be
372 entered in the hash table under the name NAME, with value VALUE.
374 There are two tables of these. builtin_array holds all the
375 "builtin" macros: these are handled by builtin_macro() in
376 macro.c. Builtin is somewhat of a misnomer -- the property of
377 interest is that these macros require special code to compute their
378 expansions. The value is a "cpp_builtin_type" enumerator.
380 operator_array holds the C++ named operators. These are keywords
381 which act as aliases for punctuators. In C++, they cannot be
382 altered through #define, and #if recognizes them as operators. In
383 C, these are not entered into the hash table at all (but see
384 <iso646.h>). The value is a token-type enumerator. */
385 struct builtin_macro
387 const uchar *const name;
388 const unsigned short len;
389 const unsigned short value;
390 const bool always_warn_if_redefined;
393 #define B(n, t, f) { DSC(n), t, f }
394 static const struct builtin_macro builtin_array[] =
396 B("__TIMESTAMP__", BT_TIMESTAMP, false),
397 B("__TIME__", BT_TIME, false),
398 B("__DATE__", BT_DATE, false),
399 B("__FILE__", BT_FILE, false),
400 B("__BASE_FILE__", BT_BASE_FILE, false),
401 B("__LINE__", BT_SPECLINE, true),
402 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL, true),
403 B("__COUNTER__", BT_COUNTER, true),
404 B("__has_attribute", BT_HAS_ATTRIBUTE, true),
405 B("__has_cpp_attribute", BT_HAS_ATTRIBUTE, true),
406 B("__has_builtin", BT_HAS_BUILTIN, true),
407 B("__has_include", BT_HAS_INCLUDE, true),
408 B("__has_include_next",BT_HAS_INCLUDE_NEXT, true),
409 /* Keep builtins not used for -traditional-cpp at the end, and
410 update init_builtins() if any more are added. */
411 B("_Pragma", BT_PRAGMA, true),
412 B("__STDC__", BT_STDC, true),
414 #undef B
416 struct builtin_operator
418 const uchar *const name;
419 const unsigned short len;
420 const unsigned short value;
423 #define B(n, t) { DSC(n), t }
424 static const struct builtin_operator operator_array[] =
426 B("and", CPP_AND_AND),
427 B("and_eq", CPP_AND_EQ),
428 B("bitand", CPP_AND),
429 B("bitor", CPP_OR),
430 B("compl", CPP_COMPL),
431 B("not", CPP_NOT),
432 B("not_eq", CPP_NOT_EQ),
433 B("or", CPP_OR_OR),
434 B("or_eq", CPP_OR_EQ),
435 B("xor", CPP_XOR),
436 B("xor_eq", CPP_XOR_EQ)
438 #undef B
440 /* Mark the C++ named operators in the hash table. */
441 static void
442 mark_named_operators (cpp_reader *pfile, int flags)
444 const struct builtin_operator *b;
446 for (b = operator_array;
447 b < (operator_array + ARRAY_SIZE (operator_array));
448 b++)
450 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
451 hp->flags |= flags;
452 hp->is_directive = 0;
453 hp->directive_index = b->value;
457 /* Helper function of cpp_type2name. Return the string associated with
458 named operator TYPE. */
459 const char *
460 cpp_named_operator2name (enum cpp_ttype type)
462 const struct builtin_operator *b;
464 for (b = operator_array;
465 b < (operator_array + ARRAY_SIZE (operator_array));
466 b++)
468 if (type == b->value)
469 return (const char *) b->name;
472 return NULL;
475 void
476 cpp_init_special_builtins (cpp_reader *pfile)
478 const struct builtin_macro *b;
479 size_t n = ARRAY_SIZE (builtin_array);
481 if (CPP_OPTION (pfile, traditional))
482 n -= 2;
483 else if (! CPP_OPTION (pfile, stdc_0_in_system_headers)
484 || CPP_OPTION (pfile, std))
485 n--;
487 for (b = builtin_array; b < builtin_array + n; b++)
489 if ((b->value == BT_HAS_ATTRIBUTE
490 || b->value == BT_HAS_BUILTIN)
491 && (CPP_OPTION (pfile, lang) == CLK_ASM
492 || pfile->cb.has_attribute == NULL))
493 continue;
494 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
495 hp->type = NT_BUILTIN_MACRO;
496 if (b->always_warn_if_redefined)
497 hp->flags |= NODE_WARN;
498 hp->value.builtin = (enum cpp_builtin_type) b->value;
502 /* Restore macro C to builtin macro definition. */
504 void
505 _cpp_restore_special_builtin (cpp_reader *pfile, struct def_pragma_macro *c)
507 size_t len = strlen (c->name);
509 for (const struct builtin_macro *b = builtin_array;
510 b < builtin_array + ARRAY_SIZE (builtin_array); b++)
511 if (b->len == len && memcmp (c->name, b->name, len + 1) == 0)
513 cpp_hashnode *hp = cpp_lookup (pfile, b->name, b->len);
514 hp->type = NT_BUILTIN_MACRO;
515 if (b->always_warn_if_redefined)
516 hp->flags |= NODE_WARN;
517 hp->value.builtin = (enum cpp_builtin_type) b->value;
521 /* Read the builtins table above and enter them, and language-specific
522 macros, into the hash table. HOSTED is true if this is a hosted
523 environment. */
524 void
525 cpp_init_builtins (cpp_reader *pfile, int hosted)
527 cpp_init_special_builtins (pfile);
529 if (!CPP_OPTION (pfile, traditional)
530 && (! CPP_OPTION (pfile, stdc_0_in_system_headers)
531 || CPP_OPTION (pfile, std)))
532 _cpp_define_builtin (pfile, "__STDC__ 1");
534 if (CPP_OPTION (pfile, cplusplus))
536 if (CPP_OPTION (pfile, lang) == CLK_CXX2A
537 || CPP_OPTION (pfile, lang) == CLK_GNUCXX2A)
538 _cpp_define_builtin (pfile, "__cplusplus 201709L");
539 else if (CPP_OPTION (pfile, lang) == CLK_CXX17
540 || CPP_OPTION (pfile, lang) == CLK_GNUCXX17)
541 _cpp_define_builtin (pfile, "__cplusplus 201703L");
542 else if (CPP_OPTION (pfile, lang) == CLK_CXX14
543 || CPP_OPTION (pfile, lang) == CLK_GNUCXX14)
544 _cpp_define_builtin (pfile, "__cplusplus 201402L");
545 else if (CPP_OPTION (pfile, lang) == CLK_CXX11
546 || CPP_OPTION (pfile, lang) == CLK_GNUCXX11)
547 _cpp_define_builtin (pfile, "__cplusplus 201103L");
548 else
549 _cpp_define_builtin (pfile, "__cplusplus 199711L");
551 else if (CPP_OPTION (pfile, lang) == CLK_ASM)
552 _cpp_define_builtin (pfile, "__ASSEMBLER__ 1");
553 else if (CPP_OPTION (pfile, lang) == CLK_STDC94)
554 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199409L");
555 else if (CPP_OPTION (pfile, lang) == CLK_STDC2X
556 || CPP_OPTION (pfile, lang) == CLK_GNUC2X)
557 _cpp_define_builtin (pfile, "__STDC_VERSION__ 202000L");
558 else if (CPP_OPTION (pfile, lang) == CLK_STDC17
559 || CPP_OPTION (pfile, lang) == CLK_GNUC17)
560 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201710L");
561 else if (CPP_OPTION (pfile, lang) == CLK_STDC11
562 || CPP_OPTION (pfile, lang) == CLK_GNUC11)
563 _cpp_define_builtin (pfile, "__STDC_VERSION__ 201112L");
564 else if (CPP_OPTION (pfile, c99))
565 _cpp_define_builtin (pfile, "__STDC_VERSION__ 199901L");
567 if (CPP_OPTION (pfile, uliterals)
568 && !(CPP_OPTION (pfile, cplusplus)
569 && (CPP_OPTION (pfile, lang) == CLK_GNUCXX
570 || CPP_OPTION (pfile, lang) == CLK_CXX98)))
572 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
573 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
576 if (hosted)
577 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
578 else
579 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
581 if (CPP_OPTION (pfile, objc))
582 _cpp_define_builtin (pfile, "__OBJC__ 1");
585 /* Sanity-checks are dependent on command-line options, so it is
586 called as a subroutine of cpp_read_main_file. */
587 #if CHECKING_P
588 static void sanity_checks (cpp_reader *);
589 static void sanity_checks (cpp_reader *pfile)
591 cppchar_t test = 0;
592 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
594 /* Sanity checks for assumptions about CPP arithmetic and target
595 type precisions made by cpplib. */
596 test--;
597 if (test < 1)
598 cpp_error (pfile, CPP_DL_ICE, "cppchar_t must be an unsigned type");
600 if (CPP_OPTION (pfile, precision) > max_precision)
601 cpp_error (pfile, CPP_DL_ICE,
602 "preprocessor arithmetic has maximum precision of %lu bits;"
603 " target requires %lu bits",
604 (unsigned long) max_precision,
605 (unsigned long) CPP_OPTION (pfile, precision));
607 if (CPP_OPTION (pfile, precision) < CPP_OPTION (pfile, int_precision))
608 cpp_error (pfile, CPP_DL_ICE,
609 "CPP arithmetic must be at least as precise as a target int");
611 if (CPP_OPTION (pfile, char_precision) < 8)
612 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
614 if (CPP_OPTION (pfile, wchar_precision) < CPP_OPTION (pfile, char_precision))
615 cpp_error (pfile, CPP_DL_ICE,
616 "target wchar_t is narrower than target char");
618 if (CPP_OPTION (pfile, int_precision) < CPP_OPTION (pfile, char_precision))
619 cpp_error (pfile, CPP_DL_ICE,
620 "target int is narrower than target char");
622 /* This is assumed in eval_token() and could be fixed if necessary. */
623 if (sizeof (cppchar_t) > sizeof (cpp_num_part))
624 cpp_error (pfile, CPP_DL_ICE,
625 "CPP half-integer narrower than CPP character");
627 if (CPP_OPTION (pfile, wchar_precision) > BITS_PER_CPPCHAR_T)
628 cpp_error (pfile, CPP_DL_ICE,
629 "CPP on this host cannot handle wide character constants over"
630 " %lu bits, but the target requires %lu bits",
631 (unsigned long) BITS_PER_CPPCHAR_T,
632 (unsigned long) CPP_OPTION (pfile, wchar_precision));
634 #else
635 # define sanity_checks(PFILE)
636 #endif
638 /* This is called after options have been parsed, and partially
639 processed. */
640 void
641 cpp_post_options (cpp_reader *pfile)
643 int flags;
645 sanity_checks (pfile);
647 post_options (pfile);
649 /* Mark named operators before handling command line macros. */
650 flags = 0;
651 if (CPP_OPTION (pfile, cplusplus) && CPP_OPTION (pfile, operator_names))
652 flags |= NODE_OPERATOR;
653 if (CPP_OPTION (pfile, warn_cxx_operator_names))
654 flags |= NODE_DIAGNOSTIC | NODE_WARN_OPERATOR;
655 if (flags != 0)
656 mark_named_operators (pfile, flags);
659 /* Setup for processing input from the file named FNAME, or stdin if
660 it is the empty string. Return the original filename
661 on success (e.g. foo.i->foo.c), or NULL on failure. */
662 const char *
663 cpp_read_main_file (cpp_reader *pfile, const char *fname)
665 const location_t loc = 0;
667 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
669 if (!pfile->deps)
670 pfile->deps = deps_init ();
672 /* Set the default target (if there is none already). */
673 deps_add_default_target (pfile->deps, fname);
676 pfile->main_file
677 = _cpp_find_file (pfile, fname, &pfile->no_search_path, /*angle=*/0,
678 /*fake=*/false, /*preinclude=*/false, /*hasinclude=*/false,
679 loc);
680 if (_cpp_find_failed (pfile->main_file))
681 return NULL;
683 _cpp_stack_file (pfile, pfile->main_file, IT_MAIN, 0);
685 /* For foo.i, read the original filename foo.c now, for the benefit
686 of the front ends. */
687 if (CPP_OPTION (pfile, preprocessed))
689 read_original_filename (pfile);
690 fname =
691 ORDINARY_MAP_FILE_NAME
692 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table)));
694 return fname;
697 /* For preprocessed files, if the first tokens are of the form # NUM.
698 handle the directive so we know the original file name. This will
699 generate file_change callbacks, which the front ends must handle
700 appropriately given their state of initialization. */
701 static void
702 read_original_filename (cpp_reader *pfile)
704 const cpp_token *token, *token1;
706 /* Lex ahead; if the first tokens are of the form # NUM, then
707 process the directive, otherwise back up. */
708 token = _cpp_lex_direct (pfile);
709 if (token->type == CPP_HASH)
711 pfile->state.in_directive = 1;
712 token1 = _cpp_lex_direct (pfile);
713 _cpp_backup_tokens (pfile, 1);
714 pfile->state.in_directive = 0;
716 /* If it's a #line directive, handle it. */
717 if (token1->type == CPP_NUMBER
718 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE))
720 read_original_directory (pfile);
721 return;
725 /* Backup as if nothing happened. */
726 _cpp_backup_tokens (pfile, 1);
729 /* For preprocessed files, if the tokens following the first filename
730 line is of the form # <line> "/path/name//", handle the
731 directive so we know the original current directory. */
732 static void
733 read_original_directory (cpp_reader *pfile)
735 const cpp_token *hash, *token;
737 /* Lex ahead; if the first tokens are of the form # NUM, then
738 process the directive, otherwise back up. */
739 hash = _cpp_lex_direct (pfile);
740 if (hash->type != CPP_HASH)
742 _cpp_backup_tokens (pfile, 1);
743 return;
746 token = _cpp_lex_direct (pfile);
748 if (token->type != CPP_NUMBER)
750 _cpp_backup_tokens (pfile, 2);
751 return;
754 token = _cpp_lex_direct (pfile);
756 if (token->type != CPP_STRING
757 || ! (token->val.str.len >= 5
758 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-2])
759 && IS_DIR_SEPARATOR (token->val.str.text[token->val.str.len-3])))
761 _cpp_backup_tokens (pfile, 3);
762 return;
765 if (pfile->cb.dir_change)
767 char *debugdir = (char *) alloca (token->val.str.len - 3);
769 memcpy (debugdir, (const char *) token->val.str.text + 1,
770 token->val.str.len - 4);
771 debugdir[token->val.str.len - 4] = '\0';
773 pfile->cb.dir_change (pfile, debugdir);
777 /* This is called at the end of preprocessing. It pops the last
778 buffer and writes dependency output.
780 Maybe it should also reset state, such that you could call
781 cpp_start_read with a new filename to restart processing. */
782 void
783 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
785 /* Warn about unused macros before popping the final buffer. */
786 if (CPP_OPTION (pfile, warn_unused_macros))
787 cpp_forall_identifiers (pfile, _cpp_warn_if_unused_macro, NULL);
789 /* lex.c leaves the final buffer on the stack. This it so that
790 it returns an unending stream of CPP_EOFs to the client. If we
791 popped the buffer, we'd dereference a NULL buffer pointer and
792 segfault. It's nice to allow the client to do worry-free excess
793 cpp_get_token calls. */
794 while (pfile->buffer)
795 _cpp_pop_buffer (pfile);
797 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE && deps_stream)
798 deps_write (pfile->deps, deps_stream,
799 CPP_OPTION (pfile, deps.phony_targets), 72);
801 /* Report on headers that could use multiple include guards. */
802 if (CPP_OPTION (pfile, print_include_names))
803 _cpp_report_missing_guards (pfile);
806 static void
807 post_options (cpp_reader *pfile)
809 /* -Wtraditional is not useful in C++ mode. */
810 if (CPP_OPTION (pfile, cplusplus))
811 CPP_OPTION (pfile, cpp_warn_traditional) = 0;
813 /* Permanently disable macro expansion if we are rescanning
814 preprocessed text. Read preprocesed source in ISO mode. */
815 if (CPP_OPTION (pfile, preprocessed))
817 if (!CPP_OPTION (pfile, directives_only))
818 pfile->state.prevent_expansion = 1;
819 CPP_OPTION (pfile, traditional) = 0;
822 if (CPP_OPTION (pfile, warn_trigraphs) == 2)
823 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
825 if (CPP_OPTION (pfile, traditional))
827 CPP_OPTION (pfile, trigraphs) = 0;
828 CPP_OPTION (pfile, warn_trigraphs) = 0;