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 /* 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
cpp_init_builtins(cpp_reader * pfile,int hosted)495 cpp_init_builtins (cpp_reader *pfile, int hosted)
496 {
497 cpp_init_special_builtins (pfile);
498
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");
503
504 if (CPP_OPTION (pfile, cplusplus))
505 {
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");
520 }
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");
533
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)))
538 {
539 _cpp_define_builtin (pfile, "__STDC_UTF_16__ 1");
540 _cpp_define_builtin (pfile, "__STDC_UTF_32__ 1");
541 }
542
543 if (hosted)
544 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 1");
545 else
546 _cpp_define_builtin (pfile, "__STDC_HOSTED__ 0");
547
548 if (CPP_OPTION (pfile, objc))
549 _cpp_define_builtin (pfile, "__OBJC__ 1");
550 }
551
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 *);
sanity_checks(cpp_reader * pfile)556 static void sanity_checks (cpp_reader *pfile)
557 {
558 cppchar_t test = 0;
559 size_t max_precision = 2 * CHAR_BIT * sizeof (cpp_num_part);
560
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");
566
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));
573
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");
577
578 if (CPP_OPTION (pfile, char_precision) < 8)
579 cpp_error (pfile, CPP_DL_ICE, "target char is less than 8 bits wide");
580
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");
584
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");
588
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");
593
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));
600 }
601 #else
602 # define sanity_checks(PFILE)
603 #endif
604
605 /* This is called after options have been parsed, and partially
606 processed. */
607 void
cpp_post_options(cpp_reader * pfile)608 cpp_post_options (cpp_reader *pfile)
609 {
610 int flags;
611
612 sanity_checks (pfile);
613
614 post_options (pfile);
615
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);
624 }
625
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 *
cpp_read_main_file(cpp_reader * pfile,const char * fname)630 cpp_read_main_file (cpp_reader *pfile, const char *fname)
631 {
632 const source_location loc = 0;
633
634 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE)
635 {
636 if (!pfile->deps)
637 pfile->deps = deps_init ();
638
639 /* Set the default target (if there is none already). */
640 deps_add_default_target (pfile->deps, fname);
641 }
642
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;
648
649 _cpp_stack_file (pfile, pfile->main_file, false, loc);
650
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))
654 {
655 read_original_filename (pfile);
656 fname =
657 ORDINARY_MAP_FILE_NAME
658 ((LINEMAPS_LAST_ORDINARY_MAP (pfile->line_table)));
659 }
660 return fname;
661 }
662
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
read_original_filename(cpp_reader * pfile)668 read_original_filename (cpp_reader *pfile)
669 {
670 const cpp_token *token, *token1;
671
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)
676 {
677 pfile->state.in_directive = 1;
678 token1 = _cpp_lex_direct (pfile);
679 _cpp_backup_tokens (pfile, 1);
680 pfile->state.in_directive = 0;
681
682 /* If it's a #line directive, handle it. */
683 if (token1->type == CPP_NUMBER
684 && _cpp_handle_directive (pfile, token->flags & PREV_WHITE))
685 {
686 read_original_directory (pfile);
687 return;
688 }
689 }
690
691 /* Backup as if nothing happened. */
692 _cpp_backup_tokens (pfile, 1);
693 }
694
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
read_original_directory(cpp_reader * pfile)699 read_original_directory (cpp_reader *pfile)
700 {
701 const cpp_token *hash, *token;
702
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)
707 {
708 _cpp_backup_tokens (pfile, 1);
709 return;
710 }
711
712 token = _cpp_lex_direct (pfile);
713
714 if (token->type != CPP_NUMBER)
715 {
716 _cpp_backup_tokens (pfile, 2);
717 return;
718 }
719
720 token = _cpp_lex_direct (pfile);
721
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])))
726 {
727 _cpp_backup_tokens (pfile, 3);
728 return;
729 }
730
731 if (pfile->cb.dir_change)
732 {
733 char *debugdir = (char *) alloca (token->val.str.len - 3);
734
735 memcpy (debugdir, (const char *) token->val.str.text + 1,
736 token->val.str.len - 4);
737 debugdir[token->val.str.len - 4] = '\0';
738
739 pfile->cb.dir_change (pfile, debugdir);
740 }
741 }
742
743 /* This is called at the end of preprocessing. It pops the last
744 buffer and writes dependency output.
745
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
cpp_finish(cpp_reader * pfile,FILE * deps_stream)749 cpp_finish (cpp_reader *pfile, FILE *deps_stream)
750 {
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);
754
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);
762
763 if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
764 && deps_stream)
765 {
766 deps_write (pfile->deps, deps_stream, 72);
767
768 if (CPP_OPTION (pfile, deps.phony_targets))
769 deps_phony_targets (pfile->deps, deps_stream);
770 }
771
772 /* Report on headers that could use multiple include guards. */
773 if (CPP_OPTION (pfile, print_include_names))
774 _cpp_report_missing_guards (pfile);
775 }
776
777 static void
post_options(cpp_reader * pfile)778 post_options (cpp_reader *pfile)
779 {
780 /* -Wtraditional is not useful in C++ mode. */
781 if (CPP_OPTION (pfile, cplusplus))
782 CPP_OPTION (pfile, cpp_warn_traditional) = 0;
783
784 /* Permanently disable macro expansion if we are rescanning
785 preprocessed text. Read preprocesed source in ISO mode. */
786 if (CPP_OPTION (pfile, preprocessed))
787 {
788 if (!CPP_OPTION (pfile, directives_only))
789 pfile->state.prevent_expansion = 1;
790 CPP_OPTION (pfile, traditional) = 0;
791 }
792
793 if (CPP_OPTION (pfile, warn_trigraphs) == 2)
794 CPP_OPTION (pfile, warn_trigraphs) = !CPP_OPTION (pfile, trigraphs);
795
796 if (CPP_OPTION (pfile, traditional))
797 {
798 CPP_OPTION (pfile, trigraphs) = 0;
799 CPP_OPTION (pfile, warn_trigraphs) = 0;
800 }
801 }
802