2 Copyright (C) 1986-2013 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
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/>. */
26 #include "localedir.h"
27 #include "filenames.h"
29 #ifndef ENABLE_CANONICAL_SYSTEM_HEADERS
30 #define ENABLE_CANONICAL_SYSTEM_HEADERS 0
33 static void init_library (void);
34 static void mark_named_operators (cpp_reader
*, int);
35 static void read_original_filename (cpp_reader
*);
36 static void read_original_directory (cpp_reader
*);
37 static void post_options (cpp_reader
*);
39 /* If we have designated initializers (GCC >2.7) these tables can be
40 initialized, constant data. Otherwise, they have to be filled in at
42 #if HAVE_DESIGNATED_INITIALIZERS
44 #define init_trigraph_map() /* Nothing. */
45 #define TRIGRAPH_MAP \
46 __extension__ const uchar _cpp_trigraph_map[UCHAR_MAX + 1] = {
49 #define s(p, v) [p] = v,
53 #define TRIGRAPH_MAP uchar _cpp_trigraph_map[UCHAR_MAX + 1] = { 0 }; \
54 static void init_trigraph_map (void) { \
55 unsigned char *x = _cpp_trigraph_map;
58 #define s(p, v) x[p] = v;
63 s('=', '#') s(')', ']') s('!', '|')
64 s('(', '[') s('\'', '^') s('>', '}')
65 s('/', '\\') s('<', '{') s('-', '~')
72 /* A set of booleans indicating what CPP features each source language
78 char extended_numbers
;
79 char extended_identifiers
;
81 char cplusplus_comments
;
86 char binary_constants
;
87 char digit_separators
;
90 static const struct lang_flags lang_defaults
[] =
91 { /* c99 c++ xnum xid std // digr ulit rlit udlit bin_cst dig_sep */
92 /* GNUC89 */ { 0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0 },
93 /* GNUC99 */ { 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0 },
94 /* GNUC11 */ { 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0 },
95 /* STDC89 */ { 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 },
96 /* STDC94 */ { 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0 },
97 /* STDC99 */ { 1, 0, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0 },
98 /* STDC11 */ { 1, 0, 1, 0, 1, 1, 1, 1, 0, 0, 0, 0 },
99 /* GNUCXX */ { 0, 1, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0 },
100 /* CXX98 */ { 0, 1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 0 },
101 /* GNUCXX11 */ { 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 0, 0 },
102 /* CXX11 */ { 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 0 },
103 /* GNUCXX1Y */ { 1, 1, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1 },
104 /* CXX1Y */ { 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1 },
105 /* ASM */ { 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0 }
106 /* xid should be 1 for GNUC99, STDC99, GNUCXX, CXX98, GNUCXX11, CXX11,
107 GNUCXX1Y, and CXX1Y when no longer experimental (when all uses of
108 identifiers in the compiler have been audited for correct handling
109 of extended identifiers). */
112 /* Sets internal flags correctly for a given language. */
114 cpp_set_lang (cpp_reader
*pfile
, enum c_lang lang
)
116 const struct lang_flags
*l
= &lang_defaults
[(int) lang
];
118 CPP_OPTION (pfile
, lang
) = lang
;
120 CPP_OPTION (pfile
, c99
) = l
->c99
;
121 CPP_OPTION (pfile
, cplusplus
) = l
->cplusplus
;
122 CPP_OPTION (pfile
, extended_numbers
) = l
->extended_numbers
;
123 CPP_OPTION (pfile
, extended_identifiers
) = l
->extended_identifiers
;
124 CPP_OPTION (pfile
, std
) = l
->std
;
125 CPP_OPTION (pfile
, trigraphs
) = l
->std
;
126 CPP_OPTION (pfile
, cplusplus_comments
) = l
->cplusplus_comments
;
127 CPP_OPTION (pfile
, digraphs
) = l
->digraphs
;
128 CPP_OPTION (pfile
, uliterals
) = l
->uliterals
;
129 CPP_OPTION (pfile
, rliterals
) = l
->rliterals
;
130 CPP_OPTION (pfile
, user_literals
) = l
->user_literals
;
131 CPP_OPTION (pfile
, binary_constants
) = l
->binary_constants
;
132 CPP_OPTION (pfile
, digit_separators
) = l
->digit_separators
;
135 /* Initialize library global state. */
139 static int initialized
= 0;
147 /* Set up the trigraph map. This doesn't need to do anything if
148 we were compiled with a compiler that supports C99 designated
150 init_trigraph_map ();
153 (void) bindtextdomain (PACKAGE
, LOCALEDIR
);
158 /* Initialize a cpp_reader structure. */
160 cpp_create_reader (enum c_lang lang
, cpp_hash_table
*table
,
161 struct line_maps
*line_table
)
165 /* Initialize this instance of the library if it hasn't been already. */
168 pfile
= XCNEW (cpp_reader
);
169 memset (&pfile
->base_context
, 0, sizeof (pfile
->base_context
));
171 cpp_set_lang (pfile
, lang
);
172 CPP_OPTION (pfile
, warn_multichar
) = 1;
173 CPP_OPTION (pfile
, discard_comments
) = 1;
174 CPP_OPTION (pfile
, discard_comments_in_macro_exp
) = 1;
175 CPP_OPTION (pfile
, tabstop
) = 8;
176 CPP_OPTION (pfile
, operator_names
) = 1;
177 CPP_OPTION (pfile
, warn_trigraphs
) = 2;
178 CPP_OPTION (pfile
, warn_endif_labels
) = 1;
179 CPP_OPTION (pfile
, cpp_warn_deprecated
) = 1;
180 CPP_OPTION (pfile
, cpp_warn_long_long
) = 0;
181 CPP_OPTION (pfile
, dollars_in_ident
) = 1;
182 CPP_OPTION (pfile
, warn_dollars
) = 1;
183 CPP_OPTION (pfile
, warn_variadic_macros
) = 1;
184 CPP_OPTION (pfile
, warn_builtin_macro_redefined
) = 1;
185 /* By default, track locations of tokens resulting from macro
186 expansion. The '2' means, track the locations with the highest
187 accuracy. Read the comments for struct
188 cpp_options::track_macro_expansion to learn about the other
190 CPP_OPTION (pfile
, track_macro_expansion
) = 2;
191 CPP_OPTION (pfile
, warn_normalize
) = normalized_C
;
192 CPP_OPTION (pfile
, warn_literal_suffix
) = 1;
193 CPP_OPTION (pfile
, canonical_system_headers
)
194 = ENABLE_CANONICAL_SYSTEM_HEADERS
;
195 CPP_OPTION (pfile
, ext_numeric_literals
) = 1;
197 /* Default CPP arithmetic to something sensible for the host for the
198 benefit of dumb users like fix-header. */
199 CPP_OPTION (pfile
, precision
) = CHAR_BIT
* sizeof (long);
200 CPP_OPTION (pfile
, char_precision
) = CHAR_BIT
;
201 CPP_OPTION (pfile
, wchar_precision
) = CHAR_BIT
* sizeof (int);
202 CPP_OPTION (pfile
, int_precision
) = CHAR_BIT
* sizeof (int);
203 CPP_OPTION (pfile
, unsigned_char
) = 0;
204 CPP_OPTION (pfile
, unsigned_wchar
) = 1;
205 CPP_OPTION (pfile
, bytes_big_endian
) = 1; /* does not matter */
207 /* Default to no charset conversion. */
208 CPP_OPTION (pfile
, narrow_charset
) = _cpp_default_encoding ();
209 CPP_OPTION (pfile
, wide_charset
) = 0;
211 /* Default the input character set to UTF-8. */
212 CPP_OPTION (pfile
, input_charset
) = _cpp_default_encoding ();
214 /* A fake empty "directory" used as the starting point for files
215 looked up without a search path. Name cannot be '/' because we
216 don't want to prepend anything at all to filenames using it. All
217 other entries are correct zero-initialized. */
218 pfile
->no_search_path
.name
= (char *) "";
220 /* Initialize the line map. */
221 pfile
->line_table
= line_table
;
223 /* Initialize lexer state. */
224 pfile
->state
.save_comments
= ! CPP_OPTION (pfile
, discard_comments
);
226 /* Set up static tokens. */
227 pfile
->avoid_paste
.type
= CPP_PADDING
;
228 pfile
->avoid_paste
.val
.source
= NULL
;
229 pfile
->eof
.type
= CPP_EOF
;
230 pfile
->eof
.flags
= 0;
232 /* Create a token buffer for the lexer. */
233 _cpp_init_tokenrun (&pfile
->base_run
, 250);
234 pfile
->cur_run
= &pfile
->base_run
;
235 pfile
->cur_token
= pfile
->base_run
.base
;
237 /* Initialize the base context. */
238 pfile
->context
= &pfile
->base_context
;
239 pfile
->base_context
.c
.macro
= 0;
240 pfile
->base_context
.prev
= pfile
->base_context
.next
= 0;
242 /* Aligned and unaligned storage. */
243 pfile
->a_buff
= _cpp_get_buff (pfile
, 0);
244 pfile
->u_buff
= _cpp_get_buff (pfile
, 0);
246 /* Initialize table for push_macro/pop_macro. */
247 pfile
->pushed_macros
= 0;
249 /* Do not force token locations by default. */
250 pfile
->forced_token_location_p
= NULL
;
252 /* The expression parser stack. */
253 _cpp_expand_op_stack (pfile
);
255 /* Initialize the buffer obstack. */
256 _obstack_begin (&pfile
->buffer_ob
, 0, 0,
257 (void *(*) (long)) xmalloc
,
258 (void (*) (void *)) free
);
260 _cpp_init_files (pfile
);
262 _cpp_init_hashtable (pfile
, table
);
267 /* Set the line_table entry in PFILE. This is called after reading a
268 PCH file, as the old line_table will be incorrect. */
270 cpp_set_line_map (cpp_reader
*pfile
, struct line_maps
*line_table
)
272 pfile
->line_table
= line_table
;
275 /* Free resources used by PFILE. Accessing PFILE after this function
276 returns leads to undefined behavior. Returns the error count. */
278 cpp_destroy (cpp_reader
*pfile
)
280 cpp_context
*context
, *contextn
;
281 struct def_pragma_macro
*pmacro
;
282 tokenrun
*run
, *runn
;
285 free (pfile
->op_stack
);
287 while (CPP_BUFFER (pfile
) != NULL
)
288 _cpp_pop_buffer (pfile
);
290 free (pfile
->out
.base
);
292 if (pfile
->macro_buffer
)
294 free (pfile
->macro_buffer
);
295 pfile
->macro_buffer
= NULL
;
296 pfile
->macro_buffer_len
= 0;
300 deps_free (pfile
->deps
);
301 obstack_free (&pfile
->buffer_ob
, 0);
303 _cpp_destroy_hashtable (pfile
);
304 _cpp_cleanup_files (pfile
);
305 _cpp_destroy_iconv (pfile
);
307 _cpp_free_buff (pfile
->a_buff
);
308 _cpp_free_buff (pfile
->u_buff
);
309 _cpp_free_buff (pfile
->free_buffs
);
311 for (run
= &pfile
->base_run
; run
; run
= runn
)
315 if (run
!= &pfile
->base_run
)
319 for (context
= pfile
->base_context
.next
; context
; context
= contextn
)
321 contextn
= context
->next
;
325 if (pfile
->comments
.entries
)
327 for (i
= 0; i
< pfile
->comments
.count
; i
++)
328 free (pfile
->comments
.entries
[i
].comment
);
330 free (pfile
->comments
.entries
);
332 if (pfile
->pushed_macros
)
336 pmacro
= pfile
->pushed_macros
;
337 pfile
->pushed_macros
= pmacro
->next
;
341 while (pfile
->pushed_macros
);
347 /* This structure defines one built-in identifier. A node will be
348 entered in the hash table under the name NAME, with value VALUE.
350 There are two tables of these. builtin_array holds all the
351 "builtin" macros: these are handled by builtin_macro() in
352 macro.c. Builtin is somewhat of a misnomer -- the property of
353 interest is that these macros require special code to compute their
354 expansions. The value is a "cpp_builtin_type" enumerator.
356 operator_array holds the C++ named operators. These are keywords
357 which act as aliases for punctuators. In C++, they cannot be
358 altered through #define, and #if recognizes them as operators. In
359 C, these are not entered into the hash table at all (but see
360 <iso646.h>). The value is a token-type enumerator. */
363 const uchar
*const name
;
364 const unsigned short len
;
365 const unsigned short value
;
366 const bool always_warn_if_redefined
;
369 #define B(n, t, f) { DSC(n), t, f }
370 static const struct builtin_macro builtin_array
[] =
372 B("__TIMESTAMP__", BT_TIMESTAMP
, false),
373 B("__TIME__", BT_TIME
, false),
374 B("__DATE__", BT_DATE
, false),
375 B("__FILE__", BT_FILE
, false),
376 B("__BASE_FILE__", BT_BASE_FILE
, false),
377 B("__LINE__", BT_SPECLINE
, true),
378 B("__INCLUDE_LEVEL__", BT_INCLUDE_LEVEL
, true),
379 B("__COUNTER__", BT_COUNTER
, true),
380 /* Keep builtins not used for -traditional-cpp at the end, and
381 update init_builtins() if any more are added. */
382 B("_Pragma", BT_PRAGMA
, true),
383 B("__STDC__", BT_STDC
, true),
387 struct builtin_operator
389 const uchar
*const name
;
390 const unsigned short len
;
391 const unsigned short value
;
394 #define B(n, t) { DSC(n), t }
395 static const struct builtin_operator operator_array
[] =
397 B("and", CPP_AND_AND
),
398 B("and_eq", CPP_AND_EQ
),
399 B("bitand", CPP_AND
),
401 B("compl", CPP_COMPL
),
403 B("not_eq", CPP_NOT_EQ
),
405 B("or_eq", CPP_OR_EQ
),
407 B("xor_eq", CPP_XOR_EQ
)
411 /* Mark the C++ named operators in the hash table. */
413 mark_named_operators (cpp_reader
*pfile
, int flags
)
415 const struct builtin_operator
*b
;
417 for (b
= operator_array
;
418 b
< (operator_array
+ ARRAY_SIZE (operator_array
));
421 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
423 hp
->is_directive
= 0;
424 hp
->directive_index
= b
->value
;
428 /* Helper function of cpp_type2name. Return the string associated with
429 named operator TYPE. */
431 cpp_named_operator2name (enum cpp_ttype type
)
433 const struct builtin_operator
*b
;
435 for (b
= operator_array
;
436 b
< (operator_array
+ ARRAY_SIZE (operator_array
));
439 if (type
== b
->value
)
440 return (const char *) b
->name
;
447 cpp_init_special_builtins (cpp_reader
*pfile
)
449 const struct builtin_macro
*b
;
450 size_t n
= ARRAY_SIZE (builtin_array
);
452 if (CPP_OPTION (pfile
, traditional
))
454 else if (! CPP_OPTION (pfile
, stdc_0_in_system_headers
)
455 || CPP_OPTION (pfile
, std
))
458 for (b
= builtin_array
; b
< builtin_array
+ n
; b
++)
460 cpp_hashnode
*hp
= cpp_lookup (pfile
, b
->name
, b
->len
);
462 hp
->flags
|= NODE_BUILTIN
;
463 if (b
->always_warn_if_redefined
464 || CPP_OPTION (pfile
, warn_builtin_macro_redefined
))
465 hp
->flags
|= NODE_WARN
;
466 hp
->value
.builtin
= (enum cpp_builtin_type
) b
->value
;
470 /* Read the builtins table above and enter them, and language-specific
471 macros, into the hash table. HOSTED is true if this is a hosted
474 cpp_init_builtins (cpp_reader
*pfile
, int hosted
)
476 cpp_init_special_builtins (pfile
);
478 if (!CPP_OPTION (pfile
, traditional
)
479 && (! CPP_OPTION (pfile
, stdc_0_in_system_headers
)
480 || CPP_OPTION (pfile
, std
)))
481 _cpp_define_builtin (pfile
, "__STDC__ 1");
483 if (CPP_OPTION (pfile
, cplusplus
))
485 if (CPP_OPTION (pfile
, lang
) == CLK_CXX1Y
486 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX1Y
)
487 _cpp_define_builtin (pfile
, "__cplusplus 201300L");
488 else if (CPP_OPTION (pfile
, lang
) == CLK_CXX11
489 || CPP_OPTION (pfile
, lang
) == CLK_GNUCXX11
)
490 _cpp_define_builtin (pfile
, "__cplusplus 201103L");
492 _cpp_define_builtin (pfile
, "__cplusplus 199711L");
494 else if (CPP_OPTION (pfile
, lang
) == CLK_ASM
)
495 _cpp_define_builtin (pfile
, "__ASSEMBLER__ 1");
496 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC94
)
497 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 199409L");
498 else if (CPP_OPTION (pfile
, lang
) == CLK_STDC11
499 || CPP_OPTION (pfile
, lang
) == CLK_GNUC11
)
500 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 201112L");
501 else if (CPP_OPTION (pfile
, c99
))
502 _cpp_define_builtin (pfile
, "__STDC_VERSION__ 199901L");
504 if (CPP_OPTION (pfile
, uliterals
)
505 && !CPP_OPTION (pfile
, cplusplus
))
507 _cpp_define_builtin (pfile
, "__STDC_UTF_16__ 1");
508 _cpp_define_builtin (pfile
, "__STDC_UTF_32__ 1");
512 _cpp_define_builtin (pfile
, "__STDC_HOSTED__ 1");
514 _cpp_define_builtin (pfile
, "__STDC_HOSTED__ 0");
516 if (CPP_OPTION (pfile
, objc
))
517 _cpp_define_builtin (pfile
, "__OBJC__ 1");
520 /* Sanity-checks are dependent on command-line options, so it is
521 called as a subroutine of cpp_read_main_file (). */
523 static void sanity_checks (cpp_reader
*);
524 static void sanity_checks (cpp_reader
*pfile
)
527 size_t max_precision
= 2 * CHAR_BIT
* sizeof (cpp_num_part
);
529 /* Sanity checks for assumptions about CPP arithmetic and target
530 type precisions made by cpplib. */
533 cpp_error (pfile
, CPP_DL_ICE
, "cppchar_t must be an unsigned type");
535 if (CPP_OPTION (pfile
, precision
) > max_precision
)
536 cpp_error (pfile
, CPP_DL_ICE
,
537 "preprocessor arithmetic has maximum precision of %lu bits;"
538 " target requires %lu bits",
539 (unsigned long) max_precision
,
540 (unsigned long) CPP_OPTION (pfile
, precision
));
542 if (CPP_OPTION (pfile
, precision
) < CPP_OPTION (pfile
, int_precision
))
543 cpp_error (pfile
, CPP_DL_ICE
,
544 "CPP arithmetic must be at least as precise as a target int");
546 if (CPP_OPTION (pfile
, char_precision
) < 8)
547 cpp_error (pfile
, CPP_DL_ICE
, "target char is less than 8 bits wide");
549 if (CPP_OPTION (pfile
, wchar_precision
) < CPP_OPTION (pfile
, char_precision
))
550 cpp_error (pfile
, CPP_DL_ICE
,
551 "target wchar_t is narrower than target char");
553 if (CPP_OPTION (pfile
, int_precision
) < CPP_OPTION (pfile
, char_precision
))
554 cpp_error (pfile
, CPP_DL_ICE
,
555 "target int is narrower than target char");
557 /* This is assumed in eval_token() and could be fixed if necessary. */
558 if (sizeof (cppchar_t
) > sizeof (cpp_num_part
))
559 cpp_error (pfile
, CPP_DL_ICE
,
560 "CPP half-integer narrower than CPP character");
562 if (CPP_OPTION (pfile
, wchar_precision
) > BITS_PER_CPPCHAR_T
)
563 cpp_error (pfile
, CPP_DL_ICE
,
564 "CPP on this host cannot handle wide character constants over"
565 " %lu bits, but the target requires %lu bits",
566 (unsigned long) BITS_PER_CPPCHAR_T
,
567 (unsigned long) CPP_OPTION (pfile
, wchar_precision
));
570 # define sanity_checks(PFILE)
573 /* This is called after options have been parsed, and partially
576 cpp_post_options (cpp_reader
*pfile
)
580 sanity_checks (pfile
);
582 post_options (pfile
);
584 /* Mark named operators before handling command line macros. */
586 if (CPP_OPTION (pfile
, cplusplus
) && CPP_OPTION (pfile
, operator_names
))
587 flags
|= NODE_OPERATOR
;
588 if (CPP_OPTION (pfile
, warn_cxx_operator_names
))
589 flags
|= NODE_DIAGNOSTIC
| NODE_WARN_OPERATOR
;
591 mark_named_operators (pfile
, flags
);
594 /* Setup for processing input from the file named FNAME, or stdin if
595 it is the empty string. Return the original filename
596 on success (e.g. foo.i->foo.c), or NULL on failure. */
598 cpp_read_main_file (cpp_reader
*pfile
, const char *fname
)
600 if (CPP_OPTION (pfile
, deps
.style
) != DEPS_NONE
)
603 pfile
->deps
= deps_init ();
605 /* Set the default target (if there is none already). */
606 deps_add_default_target (pfile
->deps
, fname
);
610 = _cpp_find_file (pfile
, fname
, &pfile
->no_search_path
, false, 0, false);
611 if (_cpp_find_failed (pfile
->main_file
))
614 _cpp_stack_file (pfile
, pfile
->main_file
, false);
616 /* For foo.i, read the original filename foo.c now, for the benefit
617 of the front ends. */
618 if (CPP_OPTION (pfile
, preprocessed
))
620 read_original_filename (pfile
);
622 ORDINARY_MAP_FILE_NAME
623 ((LINEMAPS_LAST_ORDINARY_MAP (pfile
->line_table
)));
628 /* For preprocessed files, if the first tokens are of the form # NUM.
629 handle the directive so we know the original file name. This will
630 generate file_change callbacks, which the front ends must handle
631 appropriately given their state of initialization. */
633 read_original_filename (cpp_reader
*pfile
)
635 const cpp_token
*token
, *token1
;
637 /* Lex ahead; if the first tokens are of the form # NUM, then
638 process the directive, otherwise back up. */
639 token
= _cpp_lex_direct (pfile
);
640 if (token
->type
== CPP_HASH
)
642 pfile
->state
.in_directive
= 1;
643 token1
= _cpp_lex_direct (pfile
);
644 _cpp_backup_tokens (pfile
, 1);
645 pfile
->state
.in_directive
= 0;
647 /* If it's a #line directive, handle it. */
648 if (token1
->type
== CPP_NUMBER
649 && _cpp_handle_directive (pfile
, token
->flags
& PREV_WHITE
))
651 read_original_directory (pfile
);
656 /* Backup as if nothing happened. */
657 _cpp_backup_tokens (pfile
, 1);
660 /* For preprocessed files, if the tokens following the first filename
661 line is of the form # <line> "/path/name//", handle the
662 directive so we know the original current directory. */
664 read_original_directory (cpp_reader
*pfile
)
666 const cpp_token
*hash
, *token
;
668 /* Lex ahead; if the first tokens are of the form # NUM, then
669 process the directive, otherwise back up. */
670 hash
= _cpp_lex_direct (pfile
);
671 if (hash
->type
!= CPP_HASH
)
673 _cpp_backup_tokens (pfile
, 1);
677 token
= _cpp_lex_direct (pfile
);
679 if (token
->type
!= CPP_NUMBER
)
681 _cpp_backup_tokens (pfile
, 2);
685 token
= _cpp_lex_direct (pfile
);
687 if (token
->type
!= CPP_STRING
688 || ! (token
->val
.str
.len
>= 5
689 && IS_DIR_SEPARATOR (token
->val
.str
.text
[token
->val
.str
.len
-2])
690 && IS_DIR_SEPARATOR (token
->val
.str
.text
[token
->val
.str
.len
-3])))
692 _cpp_backup_tokens (pfile
, 3);
696 if (pfile
->cb
.dir_change
)
698 char *debugdir
= (char *) alloca (token
->val
.str
.len
- 3);
700 memcpy (debugdir
, (const char *) token
->val
.str
.text
+ 1,
701 token
->val
.str
.len
- 4);
702 debugdir
[token
->val
.str
.len
- 4] = '\0';
704 pfile
->cb
.dir_change (pfile
, debugdir
);
708 /* This is called at the end of preprocessing. It pops the last
709 buffer and writes dependency output.
711 Maybe it should also reset state, such that you could call
712 cpp_start_read with a new filename to restart processing. */
714 cpp_finish (cpp_reader
*pfile
, FILE *deps_stream
)
716 /* Warn about unused macros before popping the final buffer. */
717 if (CPP_OPTION (pfile
, warn_unused_macros
))
718 cpp_forall_identifiers (pfile
, _cpp_warn_if_unused_macro
, NULL
);
720 /* lex.c leaves the final buffer on the stack. This it so that
721 it returns an unending stream of CPP_EOFs to the client. If we
722 popped the buffer, we'd dereference a NULL buffer pointer and
723 segfault. It's nice to allow the client to do worry-free excess
724 cpp_get_token calls. */
725 while (pfile
->buffer
)
726 _cpp_pop_buffer (pfile
);
728 if (CPP_OPTION (pfile
, deps
.style
) != DEPS_NONE
731 deps_write (pfile
->deps
, deps_stream
, 72);
733 if (CPP_OPTION (pfile
, deps
.phony_targets
))
734 deps_phony_targets (pfile
->deps
, deps_stream
);
737 /* Report on headers that could use multiple include guards. */
738 if (CPP_OPTION (pfile
, print_include_names
))
739 _cpp_report_missing_guards (pfile
);
743 post_options (cpp_reader
*pfile
)
745 /* -Wtraditional is not useful in C++ mode. */
746 if (CPP_OPTION (pfile
, cplusplus
))
747 CPP_OPTION (pfile
, cpp_warn_traditional
) = 0;
749 /* Permanently disable macro expansion if we are rescanning
750 preprocessed text. Read preprocesed source in ISO mode. */
751 if (CPP_OPTION (pfile
, preprocessed
))
753 if (!CPP_OPTION (pfile
, directives_only
))
754 pfile
->state
.prevent_expansion
= 1;
755 CPP_OPTION (pfile
, traditional
) = 0;
758 if (CPP_OPTION (pfile
, warn_trigraphs
) == 2)
759 CPP_OPTION (pfile
, warn_trigraphs
) = !CPP_OPTION (pfile
, trigraphs
);
761 if (CPP_OPTION (pfile
, traditional
))
763 CPP_OPTION (pfile
, cplusplus_comments
) = 0;
765 CPP_OPTION (pfile
, trigraphs
) = 0;
766 CPP_OPTION (pfile
, warn_trigraphs
) = 0;