1 /* CPP Library. (Directive handling.)
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
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/>. */
28 /* Stack of conditionals currently in progress
29 (including both successful and failing conditionals). */
32 struct if_stack
*next
;
33 location_t line
; /* Line where condition started. */
34 const cpp_hashnode
*mi_cmacro
;/* macro name for #ifndef around entire file */
35 bool skip_elses
; /* Can future #else / #elif be skipped? */
36 bool was_skipping
; /* If were skipping on entry. */
37 int type
; /* Most recent conditional for diagnostics. */
40 /* Contains a registered pragma or pragma namespace. */
41 typedef void (*pragma_cb
) (cpp_reader
*);
44 struct pragma_entry
*next
;
45 const cpp_hashnode
*pragma
; /* Name and length. */
52 struct pragma_entry
*space
;
57 /* Values for the origin field of struct directive. KANDR directives
58 come from traditional (K&R) C. STDC89 directives come from the
59 1989 C standard. EXTENSION directives are extensions. */
64 /* Values for the flags field of struct directive. COND indicates a
65 conditional; IF_COND an opening conditional. INCL means to treat
66 "..." and <...> as q-char and h-char sequences respectively. IN_I
67 means this directive should be handled even if -fpreprocessed is in
68 effect (these are the directives with callback hooks).
70 EXPAND is set on directives that are always macro-expanded. */
72 #define IF_COND (1 << 1)
75 #define EXPAND (1 << 4)
76 #define DEPRECATED (1 << 5)
78 /* Defines one #-directive, including how to handle it. */
79 typedef void (*directive_handler
) (cpp_reader
*);
80 typedef struct directive directive
;
83 directive_handler handler
; /* Function to handle directive. */
84 const uchar
*name
; /* Name of directive. */
85 unsigned short length
; /* Length of name. */
86 unsigned char origin
; /* Origin of directive. */
87 unsigned char flags
; /* Flags describing this directive. */
90 /* Forward declarations. */
92 static void skip_rest_of_line (cpp_reader
*);
93 static void check_eol (cpp_reader
*, bool);
94 static void start_directive (cpp_reader
*);
95 static void prepare_directive_trad (cpp_reader
*);
96 static void end_directive (cpp_reader
*, int);
97 static void directive_diagnostics (cpp_reader
*, const directive
*, int);
98 static void run_directive (cpp_reader
*, int, const char *, size_t);
99 static char *glue_header_name (cpp_reader
*);
100 static const char *parse_include (cpp_reader
*, int *, const cpp_token
***,
102 static void push_conditional (cpp_reader
*, int, int, const cpp_hashnode
*);
103 static unsigned int read_flag (cpp_reader
*, unsigned int);
104 static bool strtolinenum (const uchar
*, size_t, linenum_type
*, bool *);
105 static void do_diagnostic (cpp_reader
*, enum cpp_diagnostic_level code
,
106 enum cpp_warning_reason reason
, int);
107 static cpp_hashnode
*lex_macro_node (cpp_reader
*, bool);
108 static int undefine_macros (cpp_reader
*, cpp_hashnode
*, void *);
109 static void do_include_common (cpp_reader
*, enum include_type
);
110 static struct pragma_entry
*lookup_pragma_entry (struct pragma_entry
*,
111 const cpp_hashnode
*);
112 static int count_registered_pragmas (struct pragma_entry
*);
113 static char ** save_registered_pragmas (struct pragma_entry
*, char **);
114 static char ** restore_registered_pragmas (cpp_reader
*, struct pragma_entry
*,
116 static void do_pragma_once (cpp_reader
*);
117 static void do_pragma_poison (cpp_reader
*);
118 static void do_pragma_system_header (cpp_reader
*);
119 static void do_pragma_dependency (cpp_reader
*);
120 static void do_pragma_warning_or_error (cpp_reader
*, bool error
);
121 static void do_pragma_warning (cpp_reader
*);
122 static void do_pragma_error (cpp_reader
*);
123 static void do_linemarker (cpp_reader
*);
124 static const cpp_token
*get_token_no_padding (cpp_reader
*);
125 static const cpp_token
*get__Pragma_string (cpp_reader
*);
126 static void destringize_and_run (cpp_reader
*, const cpp_string
*,
128 static bool parse_answer (cpp_reader
*, int, location_t
, cpp_macro
**);
129 static cpp_hashnode
*parse_assertion (cpp_reader
*, int, cpp_macro
**);
130 static cpp_macro
**find_answer (cpp_hashnode
*, const cpp_macro
*);
131 static void handle_assertion (cpp_reader
*, const char *, int);
132 static void do_pragma_push_macro (cpp_reader
*);
133 static void do_pragma_pop_macro (cpp_reader
*);
134 static void cpp_pop_definition (cpp_reader
*, struct def_pragma_macro
*);
136 /* This is the table of directive handlers. All extensions other than
137 #warning, #include_next, and #import are deprecated. The name is
138 where the extension appears to have come from. */
140 #define DIRECTIVE_TABLE \
141 D(define, T_DEFINE = 0, KANDR, IN_I) \
142 D(include, T_INCLUDE, KANDR, INCL | EXPAND) \
143 D(endif, T_ENDIF, KANDR, COND) \
144 D(ifdef, T_IFDEF, KANDR, COND | IF_COND) \
145 D(if, T_IF, KANDR, COND | IF_COND | EXPAND) \
146 D(else, T_ELSE, KANDR, COND) \
147 D(ifndef, T_IFNDEF, KANDR, COND | IF_COND) \
148 D(undef, T_UNDEF, KANDR, IN_I) \
149 D(line, T_LINE, KANDR, EXPAND) \
150 D(elif, T_ELIF, STDC89, COND | EXPAND) \
151 D(error, T_ERROR, STDC89, 0) \
152 D(pragma, T_PRAGMA, STDC89, IN_I) \
153 D(warning, T_WARNING, EXTENSION, 0) \
154 D(include_next, T_INCLUDE_NEXT, EXTENSION, INCL | EXPAND) \
155 D(ident, T_IDENT, EXTENSION, IN_I) \
156 D(import, T_IMPORT, EXTENSION, INCL | EXPAND) /* ObjC */ \
157 D(assert, T_ASSERT, EXTENSION, DEPRECATED) /* SVR4 */ \
158 D(unassert, T_UNASSERT, EXTENSION, DEPRECATED) /* SVR4 */ \
159 D(sccs, T_SCCS, EXTENSION, IN_I) /* SVR4? */
161 /* #sccs is synonymous with #ident. */
162 #define do_sccs do_ident
164 /* Use the table to generate a series of prototypes, an enum for the
165 directive names, and an array of directive handlers. */
167 #define D(name, t, o, f) static void do_##name (cpp_reader *);
171 #define D(n, tag, o, f) tag,
179 #define D(name, t, origin, flags) \
180 { do_##name, (const uchar *) #name, \
181 sizeof #name - 1, origin, flags },
182 static const directive dtable
[] =
188 /* A NULL-terminated array of directive names for use
189 when suggesting corrections for misspelled directives. */
190 #define D(name, t, origin, flags) #name,
191 static const char * const directive_names
[] = {
197 #undef DIRECTIVE_TABLE
199 /* Wrapper struct directive for linemarkers.
200 The origin is more or less true - the original K+R cpp
201 did use this notation in its preprocessed output. */
202 static const directive linemarker_dir
=
204 do_linemarker
, UC
"#", 1, KANDR
, IN_I
207 /* Skip any remaining tokens in a directive. */
209 skip_rest_of_line (cpp_reader
*pfile
)
211 /* Discard all stacked contexts. */
212 while (pfile
->context
->prev
)
213 _cpp_pop_context (pfile
);
215 /* Sweep up all tokens remaining on the line. */
217 while (_cpp_lex_token (pfile
)->type
!= CPP_EOF
)
221 /* Helper function for check_oel. */
224 check_eol_1 (cpp_reader
*pfile
, bool expand
, enum cpp_warning_reason reason
)
226 if (! SEEN_EOL () && (expand
227 ? cpp_get_token (pfile
)
228 : _cpp_lex_token (pfile
))->type
!= CPP_EOF
)
229 cpp_pedwarning (pfile
, reason
, "extra tokens at end of #%s directive",
230 pfile
->directive
->name
);
233 /* Variant of check_eol used for Wendif-labels warnings. */
236 check_eol_endif_labels (cpp_reader
*pfile
)
238 check_eol_1 (pfile
, false, CPP_W_ENDIF_LABELS
);
241 /* Ensure there are no stray tokens at the end of a directive. If
242 EXPAND is true, tokens macro-expanding to nothing are allowed. */
245 check_eol (cpp_reader
*pfile
, bool expand
)
247 check_eol_1 (pfile
, expand
, CPP_W_NONE
);
250 /* Ensure there are no stray tokens other than comments at the end of
251 a directive, and gather the comments. */
252 static const cpp_token
**
253 check_eol_return_comments (cpp_reader
*pfile
)
257 const cpp_token
**buf
;
259 buf
= XNEWVEC (const cpp_token
*, capacity
);
265 const cpp_token
*tok
;
267 tok
= _cpp_lex_token (pfile
);
268 if (tok
->type
== CPP_EOF
)
270 if (tok
->type
!= CPP_COMMENT
)
271 cpp_error (pfile
, CPP_DL_PEDWARN
,
272 "extra tokens at end of #%s directive",
273 pfile
->directive
->name
);
276 if (c
+ 1 >= capacity
)
279 buf
= XRESIZEVEC (const cpp_token
*, buf
, capacity
);
290 /* Called when entering a directive, _Pragma or command-line directive. */
292 start_directive (cpp_reader
*pfile
)
294 /* Setup in-directive state. */
295 pfile
->state
.in_directive
= 1;
296 pfile
->state
.save_comments
= 0;
297 pfile
->directive_result
.type
= CPP_PADDING
;
299 /* Some handlers need the position of the # for diagnostics. */
300 pfile
->directive_line
= pfile
->line_table
->highest_line
;
303 /* Called when leaving a directive, _Pragma or command-line directive. */
305 end_directive (cpp_reader
*pfile
, int skip_line
)
307 if (CPP_OPTION (pfile
, traditional
))
309 /* Revert change of prepare_directive_trad. */
310 if (!pfile
->state
.in_deferred_pragma
)
311 pfile
->state
.prevent_expansion
--;
313 if (pfile
->directive
!= &dtable
[T_DEFINE
])
314 _cpp_remove_overlay (pfile
);
316 else if (pfile
->state
.in_deferred_pragma
)
318 /* We don't skip for an assembler #. */
321 skip_rest_of_line (pfile
);
322 if (!pfile
->keep_tokens
)
324 pfile
->cur_run
= &pfile
->base_run
;
325 pfile
->cur_token
= pfile
->base_run
.base
;
330 pfile
->state
.save_comments
= ! CPP_OPTION (pfile
, discard_comments
);
331 pfile
->state
.in_directive
= 0;
332 pfile
->state
.in_expression
= 0;
333 pfile
->state
.angled_headers
= 0;
334 pfile
->directive
= 0;
337 /* Prepare to handle the directive in pfile->directive. */
339 prepare_directive_trad (cpp_reader
*pfile
)
341 if (pfile
->directive
!= &dtable
[T_DEFINE
])
343 bool no_expand
= (pfile
->directive
344 && ! (pfile
->directive
->flags
& EXPAND
));
345 bool was_skipping
= pfile
->state
.skipping
;
347 pfile
->state
.in_expression
= (pfile
->directive
== &dtable
[T_IF
]
348 || pfile
->directive
== &dtable
[T_ELIF
]);
349 if (pfile
->state
.in_expression
)
350 pfile
->state
.skipping
= false;
353 pfile
->state
.prevent_expansion
++;
354 _cpp_scan_out_logical_line (pfile
, NULL
, false);
356 pfile
->state
.prevent_expansion
--;
358 pfile
->state
.skipping
= was_skipping
;
359 _cpp_overlay_buffer (pfile
, pfile
->out
.base
,
360 pfile
->out
.cur
- pfile
->out
.base
);
363 /* Stop ISO C from expanding anything. */
364 pfile
->state
.prevent_expansion
++;
367 /* Output diagnostics for a directive DIR. INDENTED is nonzero if
368 the '#' was indented. */
370 directive_diagnostics (cpp_reader
*pfile
, const directive
*dir
, int indented
)
372 /* Issue -pedantic or deprecated warnings for extensions. We let
373 -pedantic take precedence if both are applicable. */
374 if (! pfile
->state
.skipping
)
376 if (dir
->origin
== EXTENSION
377 && !(dir
== &dtable
[T_IMPORT
] && CPP_OPTION (pfile
, objc
))
378 && CPP_PEDANTIC (pfile
))
379 cpp_error (pfile
, CPP_DL_PEDWARN
, "#%s is a GCC extension", dir
->name
);
380 else if (((dir
->flags
& DEPRECATED
) != 0
381 || (dir
== &dtable
[T_IMPORT
] && !CPP_OPTION (pfile
, objc
)))
382 && CPP_OPTION (pfile
, cpp_warn_deprecated
))
383 cpp_warning (pfile
, CPP_W_DEPRECATED
,
384 "#%s is a deprecated GCC extension", dir
->name
);
387 /* Traditionally, a directive is ignored unless its # is in
388 column 1. Therefore in code intended to work with K+R
389 compilers, directives added by C89 must have their #
390 indented, and directives present in traditional C must not.
391 This is true even of directives in skipped conditional
392 blocks. #elif cannot be used at all. */
393 if (CPP_WTRADITIONAL (pfile
))
395 if (dir
== &dtable
[T_ELIF
])
396 cpp_warning (pfile
, CPP_W_TRADITIONAL
,
397 "suggest not using #elif in traditional C");
398 else if (indented
&& dir
->origin
== KANDR
)
399 cpp_warning (pfile
, CPP_W_TRADITIONAL
,
400 "traditional C ignores #%s with the # indented",
402 else if (!indented
&& dir
->origin
!= KANDR
)
403 cpp_warning (pfile
, CPP_W_TRADITIONAL
,
404 "suggest hiding #%s from traditional C with an indented #",
409 /* Check if we have a known directive. INDENTED is true if the
410 '#' of the directive was indented. This function is in this file
411 to save unnecessarily exporting dtable etc. to lex.c. Returns
412 nonzero if the line of tokens has been handled, zero if we should
413 continue processing the line. */
415 _cpp_handle_directive (cpp_reader
*pfile
, bool indented
)
417 const directive
*dir
= 0;
418 const cpp_token
*dname
;
419 bool was_parsing_args
= pfile
->state
.parsing_args
;
420 bool was_discarding_output
= pfile
->state
.discarding_output
;
423 if (was_discarding_output
)
424 pfile
->state
.prevent_expansion
= 0;
426 if (was_parsing_args
)
428 if (CPP_OPTION (pfile
, cpp_pedantic
))
429 cpp_error (pfile
, CPP_DL_PEDWARN
,
430 "embedding a directive within macro arguments is not portable");
431 pfile
->state
.parsing_args
= 0;
432 pfile
->state
.prevent_expansion
= 0;
434 start_directive (pfile
);
435 dname
= _cpp_lex_token (pfile
);
437 if (dname
->type
== CPP_NAME
)
439 if (dname
->val
.node
.node
->is_directive
)
440 dir
= &dtable
[dname
->val
.node
.node
->directive_index
];
442 /* We do not recognize the # followed by a number extension in
444 else if (dname
->type
== CPP_NUMBER
&& CPP_OPTION (pfile
, lang
) != CLK_ASM
)
446 dir
= &linemarker_dir
;
447 if (CPP_PEDANTIC (pfile
) && ! CPP_OPTION (pfile
, preprocessed
)
448 && ! pfile
->state
.skipping
)
449 cpp_error (pfile
, CPP_DL_PEDWARN
,
450 "style of line directive is a GCC extension");
455 /* If we have a directive that is not an opening conditional,
456 invalidate any control macro. */
457 if (! (dir
->flags
& IF_COND
))
458 pfile
->mi_valid
= false;
460 /* Kluge alert. In order to be sure that code like this
465 does not cause '#define foo bar' to get executed when
466 compiled with -save-temps, we recognize directives in
467 -fpreprocessed mode only if the # is in column 1. macro.c
468 puts a space in front of any '#' at the start of a macro.
470 We exclude the -fdirectives-only case because macro expansion
471 has not been performed yet, and block comments can cause spaces
472 to precede the directive. */
473 if (CPP_OPTION (pfile
, preprocessed
)
474 && !CPP_OPTION (pfile
, directives_only
)
475 && (indented
|| !(dir
->flags
& IN_I
)))
482 /* In failed conditional groups, all non-conditional
483 directives are ignored. Before doing that, whether
484 skipping or not, we should lex angle-bracketed headers
485 correctly, and maybe output some diagnostics. */
486 pfile
->state
.angled_headers
= dir
->flags
& INCL
;
487 pfile
->state
.directive_wants_padding
= dir
->flags
& INCL
;
488 if (! CPP_OPTION (pfile
, preprocessed
))
489 directive_diagnostics (pfile
, dir
, indented
);
490 if (pfile
->state
.skipping
&& !(dir
->flags
& COND
))
494 else if (dname
->type
== CPP_EOF
)
495 ; /* CPP_EOF is the "null directive". */
498 /* An unknown directive. Don't complain about it in assembly
499 source: we don't know where the comments are, and # may
500 introduce assembler pseudo-ops. Don't complain about invalid
501 directives in skipped conditional groups (6.10 p4). */
502 if (CPP_OPTION (pfile
, lang
) == CLK_ASM
)
504 else if (!pfile
->state
.skipping
)
506 const char *unrecognized
507 = (const char *)cpp_token_as_text (pfile
, dname
);
508 const char *hint
= NULL
;
510 /* Call back into gcc to get a spelling suggestion. Ideally
511 we'd just use best_match from gcc/spellcheck.h (and filter
512 out the uncommon directives), but that requires moving it
513 to a support library. */
514 if (pfile
->cb
.get_suggestion
)
515 hint
= pfile
->cb
.get_suggestion (pfile
, unrecognized
,
520 rich_location
richloc (pfile
->line_table
, dname
->src_loc
);
521 source_range misspelled_token_range
522 = get_range_from_loc (pfile
->line_table
, dname
->src_loc
);
523 richloc
.add_fixit_replace (misspelled_token_range
, hint
);
524 cpp_error_at (pfile
, CPP_DL_ERROR
, &richloc
,
525 "invalid preprocessing directive #%s;"
526 " did you mean #%s?",
530 cpp_error (pfile
, CPP_DL_ERROR
,
531 "invalid preprocessing directive #%s",
536 pfile
->directive
= dir
;
537 if (CPP_OPTION (pfile
, traditional
))
538 prepare_directive_trad (pfile
);
541 pfile
->directive
->handler (pfile
);
543 _cpp_backup_tokens (pfile
, 1);
545 end_directive (pfile
, skip
);
546 if (was_parsing_args
&& !pfile
->state
.in_deferred_pragma
)
548 /* Restore state when within macro args. */
549 pfile
->state
.parsing_args
= 2;
550 pfile
->state
.prevent_expansion
= 1;
552 if (was_discarding_output
)
553 pfile
->state
.prevent_expansion
= 1;
557 /* Directive handler wrapper used by the command line option
558 processor. BUF is \n terminated. */
560 run_directive (cpp_reader
*pfile
, int dir_no
, const char *buf
, size_t count
)
562 cpp_push_buffer (pfile
, (const uchar
*) buf
, count
,
563 /* from_stage3 */ true);
564 start_directive (pfile
);
566 /* This is a short-term fix to prevent a leading '#' being
567 interpreted as a directive. */
568 _cpp_clean_line (pfile
);
570 pfile
->directive
= &dtable
[dir_no
];
571 if (CPP_OPTION (pfile
, traditional
))
572 prepare_directive_trad (pfile
);
573 pfile
->directive
->handler (pfile
);
574 end_directive (pfile
, 1);
575 _cpp_pop_buffer (pfile
);
578 /* Checks for validity the macro name in #define, #undef, #ifdef and
579 #ifndef directives. IS_DEF_OR_UNDEF is true if this call is
580 processing a #define or #undefine directive, and false
582 static cpp_hashnode
*
583 lex_macro_node (cpp_reader
*pfile
, bool is_def_or_undef
)
585 const cpp_token
*token
= _cpp_lex_token (pfile
);
587 /* The token immediately after #define must be an identifier. That
588 identifier may not be "defined", per C99 6.10.8p4.
589 In C++, it may not be any of the "named operators" either,
590 per C++98 [lex.digraph], [lex.key].
591 Finally, the identifier may not have been poisoned. (In that case
592 the lexer has issued the error message for us.) */
594 if (token
->type
== CPP_NAME
)
596 cpp_hashnode
*node
= token
->val
.node
.node
;
599 && node
== pfile
->spec_nodes
.n_defined
)
600 cpp_error (pfile
, CPP_DL_ERROR
,
601 "\"%s\" cannot be used as a macro name",
603 else if (! (node
->flags
& NODE_POISONED
))
606 else if (token
->flags
& NAMED_OP
)
607 cpp_error (pfile
, CPP_DL_ERROR
,
608 "\"%s\" cannot be used as a macro name as it is an operator in C++",
609 NODE_NAME (token
->val
.node
.node
));
610 else if (token
->type
== CPP_EOF
)
611 cpp_error (pfile
, CPP_DL_ERROR
, "no macro name given in #%s directive",
612 pfile
->directive
->name
);
614 cpp_error (pfile
, CPP_DL_ERROR
, "macro names must be identifiers");
619 /* Process a #define directive. Most work is done in macro.c. */
621 do_define (cpp_reader
*pfile
)
623 cpp_hashnode
*node
= lex_macro_node (pfile
, true);
627 /* If we have been requested to expand comments into macros,
628 then re-enable saving of comments. */
629 pfile
->state
.save_comments
=
630 ! CPP_OPTION (pfile
, discard_comments_in_macro_exp
);
632 if (pfile
->cb
.before_define
)
633 pfile
->cb
.before_define (pfile
);
635 if (_cpp_create_definition (pfile
, node
))
636 if (pfile
->cb
.define
)
637 pfile
->cb
.define (pfile
, pfile
->directive_line
, node
);
639 node
->flags
&= ~NODE_USED
;
643 /* Handle #undef. Mark the identifier NT_VOID in the hash table. */
645 do_undef (cpp_reader
*pfile
)
647 cpp_hashnode
*node
= lex_macro_node (pfile
, true);
651 if (pfile
->cb
.before_define
)
652 pfile
->cb
.before_define (pfile
);
655 pfile
->cb
.undef (pfile
, pfile
->directive_line
, node
);
657 /* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified
658 identifier is not currently defined as a macro name. */
659 if (cpp_macro_p (node
))
661 if (node
->flags
& NODE_WARN
)
662 cpp_error (pfile
, CPP_DL_WARNING
,
663 "undefining \"%s\"", NODE_NAME (node
));
664 else if (cpp_builtin_macro_p (node
)
665 && CPP_OPTION (pfile
, warn_builtin_macro_redefined
))
666 cpp_warning_with_line (pfile
, CPP_W_BUILTIN_MACRO_REDEFINED
,
667 pfile
->directive_line
, 0,
668 "undefining \"%s\"", NODE_NAME (node
));
670 if (CPP_OPTION (pfile
, warn_unused_macros
))
671 _cpp_warn_if_unused_macro (pfile
, node
, NULL
);
673 _cpp_free_definition (node
);
677 check_eol (pfile
, false);
680 /* Undefine a single macro/assertion/whatever. */
683 undefine_macros (cpp_reader
*pfile ATTRIBUTE_UNUSED
, cpp_hashnode
*h
,
684 void *data_p ATTRIBUTE_UNUSED
)
686 /* Body of _cpp_free_definition inlined here for speed.
687 Macros and assertions no longer have anything to free. */
689 h
->value
.answers
= NULL
;
690 h
->flags
&= ~(NODE_POISONED
|NODE_DISABLED
|NODE_USED
);
694 /* Undefine all macros and assertions. */
697 cpp_undef_all (cpp_reader
*pfile
)
699 cpp_forall_identifiers (pfile
, undefine_macros
, NULL
);
703 /* Helper routine used by parse_include. Reinterpret the current line
704 as an h-char-sequence (< ... >); we are looking at the first token
705 after the <. Returns a malloced filename. */
707 glue_header_name (cpp_reader
*pfile
)
709 const cpp_token
*token
;
711 size_t len
, total_len
= 0, capacity
= 1024;
713 /* To avoid lexed tokens overwriting our glued name, we can only
714 allocate from the string pool once we've lexed everything. */
715 buffer
= XNEWVEC (char, capacity
);
718 token
= get_token_no_padding (pfile
);
720 if (token
->type
== CPP_GREATER
)
722 if (token
->type
== CPP_EOF
)
724 cpp_error (pfile
, CPP_DL_ERROR
, "missing terminating > character");
728 len
= cpp_token_len (token
) + 2; /* Leading space, terminating \0. */
729 if (total_len
+ len
> capacity
)
731 capacity
= (capacity
+ len
) * 2;
732 buffer
= XRESIZEVEC (char, buffer
, capacity
);
735 if (token
->flags
& PREV_WHITE
)
736 buffer
[total_len
++] = ' ';
738 total_len
= (cpp_spell_token (pfile
, token
, (uchar
*) &buffer
[total_len
],
743 buffer
[total_len
] = '\0';
747 /* Returns the file name of #include, #include_next, #import and
748 #pragma dependency. The string is malloced and the caller should
749 free it. Returns NULL on error. LOCATION is the source location
753 parse_include (cpp_reader
*pfile
, int *pangle_brackets
,
754 const cpp_token
***buf
, location_t
*location
)
757 const cpp_token
*header
;
759 /* Allow macro expansion. */
760 header
= get_token_no_padding (pfile
);
761 *location
= header
->src_loc
;
762 if ((header
->type
== CPP_STRING
&& header
->val
.str
.text
[0] != 'R')
763 || header
->type
== CPP_HEADER_NAME
)
765 fname
= XNEWVEC (char, header
->val
.str
.len
- 1);
766 memcpy (fname
, header
->val
.str
.text
+ 1, header
->val
.str
.len
- 2);
767 fname
[header
->val
.str
.len
- 2] = '\0';
768 *pangle_brackets
= header
->type
== CPP_HEADER_NAME
;
770 else if (header
->type
== CPP_LESS
)
772 fname
= glue_header_name (pfile
);
773 *pangle_brackets
= 1;
777 const unsigned char *dir
;
779 if (pfile
->directive
== &dtable
[T_PRAGMA
])
780 dir
= UC
"pragma dependency";
782 dir
= pfile
->directive
->name
;
783 cpp_error (pfile
, CPP_DL_ERROR
, "#%s expects \"FILENAME\" or <FILENAME>",
789 if (pfile
->directive
== &dtable
[T_PRAGMA
])
791 /* This pragma allows extra tokens after the file name. */
793 else if (buf
== NULL
|| CPP_OPTION (pfile
, discard_comments
))
794 check_eol (pfile
, true);
797 /* If we are not discarding comments, then gather them while
798 doing the eol check. */
799 *buf
= check_eol_return_comments (pfile
);
805 /* Handle #include, #include_next and #import. */
807 do_include_common (cpp_reader
*pfile
, enum include_type type
)
811 const cpp_token
**buf
= NULL
;
814 /* Re-enable saving of comments if requested, so that the include
815 callback can dump comments which follow #include. */
816 pfile
->state
.save_comments
= ! CPP_OPTION (pfile
, discard_comments
);
818 /* Tell the lexer this is an include directive -- we want it to
819 increment the line number even if this is the last line of a file. */
820 pfile
->state
.in_directive
= 2;
822 fname
= parse_include (pfile
, &angle_brackets
, &buf
, &location
);
828 cpp_error_with_line (pfile
, CPP_DL_ERROR
, location
, 0,
829 "empty filename in #%s",
830 pfile
->directive
->name
);
834 /* Prevent #include recursion. */
835 if (pfile
->line_table
->depth
>= CPP_OPTION (pfile
, max_include_depth
))
838 "#include nested depth %u exceeds maximum of %u"
839 " (use -fmax-include-depth=DEPTH to increase the maximum)",
840 pfile
->line_table
->depth
,
841 CPP_OPTION (pfile
, max_include_depth
));
844 /* Get out of macro context, if we are. */
845 skip_rest_of_line (pfile
);
847 if (pfile
->cb
.include
)
848 pfile
->cb
.include (pfile
, pfile
->directive_line
,
849 pfile
->directive
->name
, fname
, angle_brackets
,
852 _cpp_stack_include (pfile
, fname
, angle_brackets
, type
, location
);
862 do_include (cpp_reader
*pfile
)
864 do_include_common (pfile
, IT_INCLUDE
);
868 do_import (cpp_reader
*pfile
)
870 do_include_common (pfile
, IT_IMPORT
);
874 do_include_next (cpp_reader
*pfile
)
876 enum include_type type
= IT_INCLUDE_NEXT
;
878 /* If this is the primary source file, warn and use the normal
880 if (cpp_in_primary_file (pfile
))
882 cpp_error (pfile
, CPP_DL_WARNING
,
883 "#include_next in primary source file");
886 do_include_common (pfile
, type
);
889 /* Subroutine of do_linemarker. Read possible flags after file name.
890 LAST is the last flag seen; 0 if this is the first flag. Return the
891 flag if it is valid, 0 at the end of the directive. Otherwise
894 read_flag (cpp_reader
*pfile
, unsigned int last
)
896 const cpp_token
*token
= _cpp_lex_token (pfile
);
898 if (token
->type
== CPP_NUMBER
&& token
->val
.str
.len
== 1)
900 unsigned int flag
= token
->val
.str
.text
[0] - '0';
902 if (flag
> last
&& flag
<= 4
903 && (flag
!= 4 || last
== 3)
904 && (flag
!= 2 || last
== 0))
908 if (token
->type
!= CPP_EOF
)
909 cpp_error (pfile
, CPP_DL_ERROR
, "invalid flag \"%s\" in line directive",
910 cpp_token_as_text (pfile
, token
));
914 /* Subroutine of do_line and do_linemarker. Convert a number in STR,
915 of length LEN, to binary; store it in NUMP, and return false if the
916 number was well-formed, true if not. WRAPPED is set to true if the
917 number did not fit into 'unsigned long'. */
919 strtolinenum (const uchar
*str
, size_t len
, linenum_type
*nump
, bool *wrapped
)
921 linenum_type reg
= 0;
922 linenum_type reg_prev
= 0;
941 /* Interpret #line command.
942 Note that the filename string (if any) is a true string constant
943 (escapes are interpreted). */
945 do_line (cpp_reader
*pfile
)
947 class line_maps
*line_table
= pfile
->line_table
;
948 const line_map_ordinary
*map
= LINEMAPS_LAST_ORDINARY_MAP (line_table
);
950 /* skip_rest_of_line() may cause line table to be realloc()ed so note down
953 unsigned char map_sysp
= ORDINARY_MAP_IN_SYSTEM_HEADER_P (map
);
954 const cpp_token
*token
;
955 const char *new_file
= ORDINARY_MAP_FILE_NAME (map
);
956 linenum_type new_lineno
;
958 /* C99 raised the minimum limit on #line numbers. */
959 linenum_type cap
= CPP_OPTION (pfile
, c99
) ? 2147483647 : 32767;
962 /* #line commands expand macros. */
963 token
= cpp_get_token (pfile
);
964 if (token
->type
!= CPP_NUMBER
965 || strtolinenum (token
->val
.str
.text
, token
->val
.str
.len
,
966 &new_lineno
, &wrapped
))
968 if (token
->type
== CPP_EOF
)
969 cpp_error (pfile
, CPP_DL_ERROR
, "unexpected end of file after #line");
971 cpp_error (pfile
, CPP_DL_ERROR
,
972 "\"%s\" after #line is not a positive integer",
973 cpp_token_as_text (pfile
, token
));
977 if (CPP_PEDANTIC (pfile
) && (new_lineno
== 0 || new_lineno
> cap
|| wrapped
))
978 cpp_error (pfile
, CPP_DL_PEDWARN
, "line number out of range");
980 cpp_error (pfile
, CPP_DL_WARNING
, "line number out of range");
982 token
= cpp_get_token (pfile
);
983 if (token
->type
== CPP_STRING
)
985 cpp_string s
= { 0, 0 };
986 if (cpp_interpret_string_notranslate (pfile
, &token
->val
.str
, 1,
988 new_file
= (const char *)s
.text
;
989 check_eol (pfile
, true);
991 else if (token
->type
!= CPP_EOF
)
993 cpp_error (pfile
, CPP_DL_ERROR
, "\"%s\" is not a valid filename",
994 cpp_token_as_text (pfile
, token
));
998 skip_rest_of_line (pfile
);
999 _cpp_do_file_change (pfile
, LC_RENAME_VERBATIM
, new_file
, new_lineno
,
1001 line_table
->seen_line_directive
= true;
1004 /* Interpret the # 44 "file" [flags] notation, which has slightly
1005 different syntax and semantics from #line: Flags are allowed,
1006 and we never complain about the line number being too big. */
1008 do_linemarker (cpp_reader
*pfile
)
1010 class line_maps
*line_table
= pfile
->line_table
;
1011 const line_map_ordinary
*map
= LINEMAPS_LAST_ORDINARY_MAP (line_table
);
1012 const cpp_token
*token
;
1013 const char *new_file
= ORDINARY_MAP_FILE_NAME (map
);
1014 linenum_type new_lineno
;
1015 unsigned int new_sysp
= ORDINARY_MAP_IN_SYSTEM_HEADER_P (map
);
1016 enum lc_reason reason
= LC_RENAME_VERBATIM
;
1020 /* Back up so we can get the number again. Putting this in
1021 _cpp_handle_directive risks two calls to _cpp_backup_tokens in
1022 some circumstances, which can segfault. */
1023 _cpp_backup_tokens (pfile
, 1);
1025 /* #line commands expand macros. */
1026 token
= cpp_get_token (pfile
);
1027 if (token
->type
!= CPP_NUMBER
1028 || strtolinenum (token
->val
.str
.text
, token
->val
.str
.len
,
1029 &new_lineno
, &wrapped
))
1031 /* Unlike #line, there does not seem to be a way to get an EOF
1032 here. So, it should be safe to always spell the token. */
1033 cpp_error (pfile
, CPP_DL_ERROR
,
1034 "\"%s\" after # is not a positive integer",
1035 cpp_token_as_text (pfile
, token
));
1039 token
= cpp_get_token (pfile
);
1040 if (token
->type
== CPP_STRING
)
1042 cpp_string s
= { 0, 0 };
1043 if (cpp_interpret_string_notranslate (pfile
, &token
->val
.str
,
1045 new_file
= (const char *)s
.text
;
1048 flag
= read_flag (pfile
, 0);
1052 /* Fake an include for cpp_included (). */
1053 _cpp_fake_include (pfile
, new_file
);
1054 flag
= read_flag (pfile
, flag
);
1059 flag
= read_flag (pfile
, flag
);
1064 flag
= read_flag (pfile
, flag
);
1068 pfile
->buffer
->sysp
= new_sysp
;
1070 check_eol (pfile
, false);
1072 else if (token
->type
!= CPP_EOF
)
1074 cpp_error (pfile
, CPP_DL_ERROR
, "\"%s\" is not a valid filename",
1075 cpp_token_as_text (pfile
, token
));
1079 skip_rest_of_line (pfile
);
1081 if (reason
== LC_LEAVE
)
1083 /* Reread map since cpp_get_token can invalidate it with a
1085 map
= LINEMAPS_LAST_ORDINARY_MAP (line_table
);
1086 const line_map_ordinary
*from
1087 = linemap_included_from_linemap (line_table
, map
);
1091 else if (!new_file
[0])
1092 /* Leaving to "" means fill in the popped-to name. */
1093 new_file
= ORDINARY_MAP_FILE_NAME (from
);
1094 else if (filename_cmp (ORDINARY_MAP_FILE_NAME (from
), new_file
) != 0)
1095 /* It's the wrong name, Grommit! */
1100 cpp_warning (pfile
, CPP_W_NONE
,
1101 "file \"%s\" linemarker ignored due to "
1102 "incorrect nesting", new_file
);
1107 /* Compensate for the increment in linemap_add that occurs in
1108 _cpp_do_file_change. We're currently at the start of the line
1109 *following* the #line directive. A separate location_t for this
1110 location makes no sense (until we do the LC_LEAVE), and
1111 complicates LAST_SOURCE_LINE_LOCATION. */
1112 pfile
->line_table
->highest_location
--;
1114 _cpp_do_file_change (pfile
, reason
, new_file
, new_lineno
, new_sysp
);
1115 line_table
->seen_line_directive
= true;
1118 /* Arrange the file_change callback. Changing to TO_FILE:TO_LINE for
1119 REASON. SYSP is 1 for a system header, 2 for a system header that
1120 needs to be extern "C" protected, and zero otherwise. */
1122 _cpp_do_file_change (cpp_reader
*pfile
, enum lc_reason reason
,
1123 const char *to_file
, linenum_type to_line
,
1126 linemap_assert (reason
!= LC_ENTER_MACRO
);
1128 const line_map_ordinary
*ord_map
= NULL
;
1129 if (!to_line
&& reason
== LC_RENAME_VERBATIM
)
1131 /* A linemarker moving to line zero. If we're on the second
1132 line of the current map, and it also starts at zero, just
1133 rewind -- we're probably reading the builtins of a
1134 preprocessed source. */
1135 line_map_ordinary
*last
= LINEMAPS_LAST_ORDINARY_MAP (pfile
->line_table
);
1136 if (!ORDINARY_MAP_STARTING_LINE_NUMBER (last
)
1137 && 0 == filename_cmp (to_file
, ORDINARY_MAP_FILE_NAME (last
))
1138 && SOURCE_LINE (last
, pfile
->line_table
->highest_line
) == 2)
1141 pfile
->line_table
->highest_location
1142 = pfile
->line_table
->highest_line
= MAP_START_LOCATION (last
);
1147 if (const line_map
*map
= linemap_add (pfile
->line_table
, reason
, sysp
,
1150 ord_map
= linemap_check_ordinary (map
);
1151 linemap_line_start (pfile
->line_table
,
1152 ORDINARY_MAP_STARTING_LINE_NUMBER (ord_map
),
1156 if (pfile
->cb
.file_change
)
1157 pfile
->cb
.file_change (pfile
, ord_map
);
1160 /* Report a warning or error detected by the program we are
1161 processing. Use the directive's tokens in the error message. */
1163 do_diagnostic (cpp_reader
*pfile
, enum cpp_diagnostic_level code
,
1164 enum cpp_warning_reason reason
, int print_dir
)
1166 const unsigned char *dir_name
;
1167 unsigned char *line
;
1168 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1171 dir_name
= pfile
->directive
->name
;
1174 pfile
->state
.prevent_expansion
++;
1175 line
= cpp_output_line_to_string (pfile
, dir_name
);
1176 pfile
->state
.prevent_expansion
--;
1178 if (code
== CPP_DL_WARNING_SYSHDR
&& reason
)
1179 cpp_warning_with_line_syshdr (pfile
, reason
, src_loc
, 0, "%s", line
);
1180 else if (code
== CPP_DL_WARNING
&& reason
)
1181 cpp_warning_with_line (pfile
, reason
, src_loc
, 0, "%s", line
);
1183 cpp_error_with_line (pfile
, code
, src_loc
, 0, "%s", line
);
1188 do_error (cpp_reader
*pfile
)
1190 do_diagnostic (pfile
, CPP_DL_ERROR
, CPP_W_NONE
, 1);
1194 do_warning (cpp_reader
*pfile
)
1196 /* We want #warning diagnostics to be emitted in system headers too. */
1197 do_diagnostic (pfile
, CPP_DL_WARNING_SYSHDR
, CPP_W_WARNING_DIRECTIVE
, 1);
1200 /* Report program identification. */
1202 do_ident (cpp_reader
*pfile
)
1204 const cpp_token
*str
= cpp_get_token (pfile
);
1206 if (str
->type
!= CPP_STRING
)
1207 cpp_error (pfile
, CPP_DL_ERROR
, "invalid #%s directive",
1208 pfile
->directive
->name
);
1209 else if (pfile
->cb
.ident
)
1210 pfile
->cb
.ident (pfile
, pfile
->directive_line
, &str
->val
.str
);
1212 check_eol (pfile
, false);
1215 /* Lookup a PRAGMA name in a singly-linked CHAIN. Returns the
1216 matching entry, or NULL if none is found. The returned entry could
1217 be the start of a namespace chain, or a pragma. */
1218 static struct pragma_entry
*
1219 lookup_pragma_entry (struct pragma_entry
*chain
, const cpp_hashnode
*pragma
)
1221 while (chain
&& chain
->pragma
!= pragma
)
1222 chain
= chain
->next
;
1227 /* Create and insert a blank pragma entry at the beginning of a
1228 singly-linked CHAIN. */
1229 static struct pragma_entry
*
1230 new_pragma_entry (cpp_reader
*pfile
, struct pragma_entry
**chain
)
1232 struct pragma_entry
*new_entry
;
1234 new_entry
= (struct pragma_entry
*)
1235 _cpp_aligned_alloc (pfile
, sizeof (struct pragma_entry
));
1237 memset (new_entry
, 0, sizeof (struct pragma_entry
));
1238 new_entry
->next
= *chain
;
1244 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1245 goes in the global namespace. */
1246 static struct pragma_entry
*
1247 register_pragma_1 (cpp_reader
*pfile
, const char *space
, const char *name
,
1248 bool allow_name_expansion
)
1250 struct pragma_entry
**chain
= &pfile
->pragmas
;
1251 struct pragma_entry
*entry
;
1252 const cpp_hashnode
*node
;
1256 node
= cpp_lookup (pfile
, UC space
, strlen (space
));
1257 entry
= lookup_pragma_entry (*chain
, node
);
1260 entry
= new_pragma_entry (pfile
, chain
);
1261 entry
->pragma
= node
;
1262 entry
->is_nspace
= true;
1263 entry
->allow_expansion
= allow_name_expansion
;
1265 else if (!entry
->is_nspace
)
1267 else if (entry
->allow_expansion
!= allow_name_expansion
)
1269 cpp_error (pfile
, CPP_DL_ICE
,
1270 "registering pragmas in namespace \"%s\" with mismatched "
1271 "name expansion", space
);
1274 chain
= &entry
->u
.space
;
1276 else if (allow_name_expansion
)
1278 cpp_error (pfile
, CPP_DL_ICE
,
1279 "registering pragma \"%s\" with name expansion "
1280 "and no namespace", name
);
1284 /* Check for duplicates. */
1285 node
= cpp_lookup (pfile
, UC name
, strlen (name
));
1286 entry
= lookup_pragma_entry (*chain
, node
);
1289 entry
= new_pragma_entry (pfile
, chain
);
1290 entry
->pragma
= node
;
1294 if (entry
->is_nspace
)
1296 cpp_error (pfile
, CPP_DL_ICE
,
1297 "registering \"%s\" as both a pragma and a pragma namespace",
1300 cpp_error (pfile
, CPP_DL_ICE
, "#pragma %s %s is already registered",
1303 cpp_error (pfile
, CPP_DL_ICE
, "#pragma %s is already registered", name
);
1308 /* Register a cpplib internal pragma SPACE NAME with HANDLER. */
1310 register_pragma_internal (cpp_reader
*pfile
, const char *space
,
1311 const char *name
, pragma_cb handler
)
1313 struct pragma_entry
*entry
;
1315 entry
= register_pragma_1 (pfile
, space
, name
, false);
1316 entry
->is_internal
= true;
1317 entry
->u
.handler
= handler
;
1320 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1321 goes in the global namespace. HANDLER is the handler it will call,
1322 which must be non-NULL. If ALLOW_EXPANSION is set, allow macro
1323 expansion while parsing pragma NAME. This function is exported
1326 cpp_register_pragma (cpp_reader
*pfile
, const char *space
, const char *name
,
1327 pragma_cb handler
, bool allow_expansion
)
1329 struct pragma_entry
*entry
;
1333 cpp_error (pfile
, CPP_DL_ICE
, "registering pragma with NULL handler");
1337 entry
= register_pragma_1 (pfile
, space
, name
, false);
1340 entry
->allow_expansion
= allow_expansion
;
1341 entry
->u
.handler
= handler
;
1345 /* Similarly, but create mark the pragma for deferred processing.
1346 When found, a CPP_PRAGMA token will be insertted into the stream
1347 with IDENT in the token->u.pragma slot. */
1349 cpp_register_deferred_pragma (cpp_reader
*pfile
, const char *space
,
1350 const char *name
, unsigned int ident
,
1351 bool allow_expansion
, bool allow_name_expansion
)
1353 struct pragma_entry
*entry
;
1355 entry
= register_pragma_1 (pfile
, space
, name
, allow_name_expansion
);
1358 entry
->is_deferred
= true;
1359 entry
->allow_expansion
= allow_expansion
;
1360 entry
->u
.ident
= ident
;
1364 /* Register the pragmas the preprocessor itself handles. */
1366 _cpp_init_internal_pragmas (cpp_reader
*pfile
)
1368 /* Pragmas in the global namespace. */
1369 register_pragma_internal (pfile
, 0, "once", do_pragma_once
);
1370 register_pragma_internal (pfile
, 0, "push_macro", do_pragma_push_macro
);
1371 register_pragma_internal (pfile
, 0, "pop_macro", do_pragma_pop_macro
);
1373 /* New GCC-specific pragmas should be put in the GCC namespace. */
1374 register_pragma_internal (pfile
, "GCC", "poison", do_pragma_poison
);
1375 register_pragma_internal (pfile
, "GCC", "system_header",
1376 do_pragma_system_header
);
1377 register_pragma_internal (pfile
, "GCC", "dependency", do_pragma_dependency
);
1378 register_pragma_internal (pfile
, "GCC", "warning", do_pragma_warning
);
1379 register_pragma_internal (pfile
, "GCC", "error", do_pragma_error
);
1382 /* Return the number of registered pragmas in PE. */
1385 count_registered_pragmas (struct pragma_entry
*pe
)
1388 for (; pe
!= NULL
; pe
= pe
->next
)
1391 ct
+= count_registered_pragmas (pe
->u
.space
);
1397 /* Save into SD the names of the registered pragmas referenced by PE,
1398 and return a pointer to the next free space in SD. */
1401 save_registered_pragmas (struct pragma_entry
*pe
, char **sd
)
1403 for (; pe
!= NULL
; pe
= pe
->next
)
1406 sd
= save_registered_pragmas (pe
->u
.space
, sd
);
1407 *sd
++ = (char *) xmemdup (HT_STR (&pe
->pragma
->ident
),
1408 HT_LEN (&pe
->pragma
->ident
),
1409 HT_LEN (&pe
->pragma
->ident
) + 1);
1414 /* Return a newly-allocated array which saves the names of the
1415 registered pragmas. */
1418 _cpp_save_pragma_names (cpp_reader
*pfile
)
1420 int ct
= count_registered_pragmas (pfile
->pragmas
);
1421 char **result
= XNEWVEC (char *, ct
);
1422 (void) save_registered_pragmas (pfile
->pragmas
, result
);
1426 /* Restore from SD the names of the registered pragmas referenced by PE,
1427 and return a pointer to the next unused name in SD. */
1430 restore_registered_pragmas (cpp_reader
*pfile
, struct pragma_entry
*pe
,
1433 for (; pe
!= NULL
; pe
= pe
->next
)
1436 sd
= restore_registered_pragmas (pfile
, pe
->u
.space
, sd
);
1437 pe
->pragma
= cpp_lookup (pfile
, UC
*sd
, strlen (*sd
));
1444 /* Restore the names of the registered pragmas from SAVED. */
1447 _cpp_restore_pragma_names (cpp_reader
*pfile
, char **saved
)
1449 (void) restore_registered_pragmas (pfile
, pfile
->pragmas
, saved
);
1453 /* Pragmata handling. We handle some, and pass the rest on to the
1454 front end. C99 defines three pragmas and says that no macro
1455 expansion is to be performed on them; whether or not macro
1456 expansion happens for other pragmas is implementation defined.
1457 This implementation allows for a mix of both, since GCC did not
1458 traditionally macro expand its (few) pragmas, whereas OpenMP
1459 specifies that macro expansion should happen. */
1461 do_pragma (cpp_reader
*pfile
)
1463 const struct pragma_entry
*p
= NULL
;
1464 const cpp_token
*token
, *pragma_token
;
1465 location_t pragma_token_virt_loc
= 0;
1467 unsigned int count
= 1;
1469 pfile
->state
.prevent_expansion
++;
1471 pragma_token
= token
= cpp_get_token_with_location (pfile
,
1472 &pragma_token_virt_loc
);
1474 if (token
->type
== CPP_NAME
)
1476 p
= lookup_pragma_entry (pfile
->pragmas
, token
->val
.node
.node
);
1477 if (p
&& p
->is_nspace
)
1479 bool allow_name_expansion
= p
->allow_expansion
;
1480 if (allow_name_expansion
)
1481 pfile
->state
.prevent_expansion
--;
1483 token
= cpp_get_token (pfile
);
1484 if (token
->type
== CPP_NAME
)
1485 p
= lookup_pragma_entry (p
->u
.space
, token
->val
.node
.node
);
1488 if (allow_name_expansion
)
1489 pfile
->state
.prevent_expansion
++;
1498 pfile
->directive_result
.src_loc
= pragma_token_virt_loc
;
1499 pfile
->directive_result
.type
= CPP_PRAGMA
;
1500 pfile
->directive_result
.flags
= pragma_token
->flags
;
1501 pfile
->directive_result
.val
.pragma
= p
->u
.ident
;
1502 pfile
->state
.in_deferred_pragma
= true;
1503 pfile
->state
.pragma_allow_expansion
= p
->allow_expansion
;
1504 if (!p
->allow_expansion
)
1505 pfile
->state
.prevent_expansion
++;
1509 /* Since the handler below doesn't get the line number, that
1510 it might need for diagnostics, make sure it has the right
1511 numbers in place. */
1512 if (pfile
->cb
.line_change
)
1513 (*pfile
->cb
.line_change
) (pfile
, pragma_token
, false);
1514 if (p
->allow_expansion
)
1515 pfile
->state
.prevent_expansion
--;
1516 (*p
->u
.handler
) (pfile
);
1517 if (p
->allow_expansion
)
1518 pfile
->state
.prevent_expansion
++;
1521 else if (pfile
->cb
.def_pragma
)
1523 if (count
== 1 || pfile
->context
->prev
== NULL
)
1524 _cpp_backup_tokens (pfile
, count
);
1527 /* Invalid name comes from macro expansion, _cpp_backup_tokens
1528 won't allow backing 2 tokens. */
1529 /* ??? The token buffer is leaked. Perhaps if def_pragma hook
1530 reads both tokens, we could perhaps free it, but if it doesn't,
1531 we don't know the exact lifespan. */
1532 cpp_token
*toks
= XNEWVEC (cpp_token
, 2);
1534 toks
[0].flags
|= NO_EXPAND
;
1536 toks
[1].flags
|= NO_EXPAND
;
1537 _cpp_push_token_context (pfile
, NULL
, toks
, 2);
1539 pfile
->cb
.def_pragma (pfile
, pfile
->directive_line
);
1542 pfile
->state
.prevent_expansion
--;
1545 /* Handle #pragma once. */
1547 do_pragma_once (cpp_reader
*pfile
)
1549 if (cpp_in_primary_file (pfile
))
1550 cpp_error (pfile
, CPP_DL_WARNING
, "#pragma once in main file");
1552 check_eol (pfile
, false);
1553 _cpp_mark_file_once_only (pfile
, pfile
->buffer
->file
);
1556 /* Handle #pragma push_macro(STRING). */
1558 do_pragma_push_macro (cpp_reader
*pfile
)
1562 const uchar
*defn
= NULL
;
1563 char *macroname
, *dest
;
1564 const char *limit
, *src
;
1565 const cpp_token
*txt
;
1566 struct def_pragma_macro
*c
;
1568 txt
= get__Pragma_string (pfile
);
1571 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1572 cpp_error_with_line (pfile
, CPP_DL_ERROR
, src_loc
, 0,
1573 "invalid #pragma push_macro directive");
1574 check_eol (pfile
, false);
1575 skip_rest_of_line (pfile
);
1578 dest
= macroname
= (char *) alloca (txt
->val
.str
.len
+ 2);
1579 src
= (const char *) (txt
->val
.str
.text
+ 1 + (txt
->val
.str
.text
[0] == 'L'));
1580 limit
= (const char *) (txt
->val
.str
.text
+ txt
->val
.str
.len
- 1);
1583 /* We know there is a character following the backslash. */
1584 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1589 check_eol (pfile
, false);
1590 skip_rest_of_line (pfile
);
1591 c
= XNEW (struct def_pragma_macro
);
1592 memset (c
, 0, sizeof (struct def_pragma_macro
));
1593 c
->name
= XNEWVAR (char, strlen (macroname
) + 1);
1594 strcpy (c
->name
, macroname
);
1595 c
->next
= pfile
->pushed_macros
;
1596 node
= _cpp_lex_identifier (pfile
, c
->name
);
1597 if (node
->type
== NT_VOID
)
1599 else if (node
->type
== NT_BUILTIN_MACRO
)
1603 defn
= cpp_macro_definition (pfile
, node
);
1604 defnlen
= ustrlen (defn
);
1605 c
->definition
= XNEWVEC (uchar
, defnlen
+ 2);
1606 c
->definition
[defnlen
] = '\n';
1607 c
->definition
[defnlen
+ 1] = 0;
1608 c
->line
= node
->value
.macro
->line
;
1609 c
->syshdr
= node
->value
.macro
->syshdr
;
1610 c
->used
= node
->value
.macro
->used
;
1611 memcpy (c
->definition
, defn
, defnlen
);
1614 pfile
->pushed_macros
= c
;
1617 /* Handle #pragma pop_macro(STRING). */
1619 do_pragma_pop_macro (cpp_reader
*pfile
)
1621 char *macroname
, *dest
;
1622 const char *limit
, *src
;
1623 const cpp_token
*txt
;
1624 struct def_pragma_macro
*l
= NULL
, *c
= pfile
->pushed_macros
;
1625 txt
= get__Pragma_string (pfile
);
1628 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1629 cpp_error_with_line (pfile
, CPP_DL_ERROR
, src_loc
, 0,
1630 "invalid #pragma pop_macro directive");
1631 check_eol (pfile
, false);
1632 skip_rest_of_line (pfile
);
1635 dest
= macroname
= (char *) alloca (txt
->val
.str
.len
+ 2);
1636 src
= (const char *) (txt
->val
.str
.text
+ 1 + (txt
->val
.str
.text
[0] == 'L'));
1637 limit
= (const char *) (txt
->val
.str
.text
+ txt
->val
.str
.len
- 1);
1640 /* We know there is a character following the backslash. */
1641 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1646 check_eol (pfile
, false);
1647 skip_rest_of_line (pfile
);
1651 if (!strcmp (c
->name
, macroname
))
1654 pfile
->pushed_macros
= c
->next
;
1657 cpp_pop_definition (pfile
, c
);
1658 free (c
->definition
);
1668 /* Handle #pragma GCC poison, to poison one or more identifiers so
1669 that the lexer produces a hard error for each subsequent usage. */
1671 do_pragma_poison (cpp_reader
*pfile
)
1673 const cpp_token
*tok
;
1676 pfile
->state
.poisoned_ok
= 1;
1679 tok
= _cpp_lex_token (pfile
);
1680 if (tok
->type
== CPP_EOF
)
1682 if (tok
->type
!= CPP_NAME
)
1684 cpp_error (pfile
, CPP_DL_ERROR
,
1685 "invalid #pragma GCC poison directive");
1689 hp
= tok
->val
.node
.node
;
1690 if (hp
->flags
& NODE_POISONED
)
1693 if (cpp_macro_p (hp
))
1694 cpp_error (pfile
, CPP_DL_WARNING
, "poisoning existing macro \"%s\"",
1696 _cpp_free_definition (hp
);
1697 hp
->flags
|= NODE_POISONED
| NODE_DIAGNOSTIC
;
1699 pfile
->state
.poisoned_ok
= 0;
1702 /* Mark the current header as a system header. This will suppress
1703 some categories of warnings (notably those from -pedantic). It is
1704 intended for use in system libraries that cannot be implemented in
1705 conforming C, but cannot be certain that their headers appear in a
1706 system include directory. To prevent abuse, it is rejected in the
1707 primary source file. */
1709 do_pragma_system_header (cpp_reader
*pfile
)
1711 if (cpp_in_primary_file (pfile
))
1712 cpp_error (pfile
, CPP_DL_WARNING
,
1713 "#pragma system_header ignored outside include file");
1716 check_eol (pfile
, false);
1717 skip_rest_of_line (pfile
);
1718 cpp_make_system_header (pfile
, 1, 0);
1722 /* Check the modified date of the current include file against a specified
1723 file. Issue a diagnostic, if the specified file is newer. We use this to
1724 determine if a fixed header should be refixed. */
1726 do_pragma_dependency (cpp_reader
*pfile
)
1729 int angle_brackets
, ordering
;
1730 location_t location
;
1732 fname
= parse_include (pfile
, &angle_brackets
, NULL
, &location
);
1736 ordering
= _cpp_compare_file_date (pfile
, fname
, angle_brackets
);
1738 cpp_error (pfile
, CPP_DL_WARNING
, "cannot find source file %s", fname
);
1739 else if (ordering
> 0)
1741 cpp_error (pfile
, CPP_DL_WARNING
,
1742 "current file is older than %s", fname
);
1743 if (cpp_get_token (pfile
)->type
!= CPP_EOF
)
1745 _cpp_backup_tokens (pfile
, 1);
1746 do_diagnostic (pfile
, CPP_DL_WARNING
, CPP_W_NONE
, 0);
1750 free ((void *) fname
);
1753 /* Issue a diagnostic with the message taken from the pragma. If
1754 ERROR is true, the diagnostic is a warning, otherwise, it is an
1757 do_pragma_warning_or_error (cpp_reader
*pfile
, bool error
)
1759 const cpp_token
*tok
= _cpp_lex_token (pfile
);
1761 if (tok
->type
!= CPP_STRING
1762 || !cpp_interpret_string_notranslate (pfile
, &tok
->val
.str
, 1, &str
,
1766 cpp_error (pfile
, CPP_DL_ERROR
, "invalid \"#pragma GCC %s\" directive",
1767 error
? "error" : "warning");
1770 cpp_error (pfile
, error
? CPP_DL_ERROR
: CPP_DL_WARNING
,
1772 free ((void *)str
.text
);
1775 /* Issue a warning diagnostic. */
1777 do_pragma_warning (cpp_reader
*pfile
)
1779 do_pragma_warning_or_error (pfile
, false);
1782 /* Issue an error diagnostic. */
1784 do_pragma_error (cpp_reader
*pfile
)
1786 do_pragma_warning_or_error (pfile
, true);
1789 /* Get a token but skip padding. */
1790 static const cpp_token
*
1791 get_token_no_padding (cpp_reader
*pfile
)
1795 const cpp_token
*result
= cpp_get_token (pfile
);
1796 if (result
->type
!= CPP_PADDING
)
1801 /* Check syntax is "(string-literal)". Returns the string on success,
1802 or NULL on failure. */
1803 static const cpp_token
*
1804 get__Pragma_string (cpp_reader
*pfile
)
1806 const cpp_token
*string
;
1807 const cpp_token
*paren
;
1809 paren
= get_token_no_padding (pfile
);
1810 if (paren
->type
== CPP_EOF
)
1811 _cpp_backup_tokens (pfile
, 1);
1812 if (paren
->type
!= CPP_OPEN_PAREN
)
1815 string
= get_token_no_padding (pfile
);
1816 if (string
->type
== CPP_EOF
)
1817 _cpp_backup_tokens (pfile
, 1);
1818 if (string
->type
!= CPP_STRING
&& string
->type
!= CPP_WSTRING
1819 && string
->type
!= CPP_STRING32
&& string
->type
!= CPP_STRING16
1820 && string
->type
!= CPP_UTF8STRING
)
1823 paren
= get_token_no_padding (pfile
);
1824 if (paren
->type
== CPP_EOF
)
1825 _cpp_backup_tokens (pfile
, 1);
1826 if (paren
->type
!= CPP_CLOSE_PAREN
)
1832 /* Destringize IN into a temporary buffer, by removing the first \ of
1833 \" and \\ sequences, and process the result as a #pragma directive. */
1835 destringize_and_run (cpp_reader
*pfile
, const cpp_string
*in
,
1836 location_t expansion_loc
)
1838 const unsigned char *src
, *limit
;
1839 char *dest
, *result
;
1840 cpp_context
*saved_context
;
1841 cpp_token
*saved_cur_token
;
1842 tokenrun
*saved_cur_run
;
1845 const struct directive
*save_directive
;
1847 dest
= result
= (char *) alloca (in
->len
- 1);
1848 src
= in
->text
+ 1 + (in
->text
[0] == 'L');
1849 limit
= in
->text
+ in
->len
- 1;
1852 /* We know there is a character following the backslash. */
1853 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1859 /* Ugh; an awful kludge. We are really not set up to be lexing
1860 tokens when in the middle of a macro expansion. Use a new
1861 context to force cpp_get_token to lex, and so skip_rest_of_line
1862 doesn't go beyond the end of the text. Also, remember the
1863 current lexing position so we can return to it later.
1865 Something like line-at-a-time lexing should remove the need for
1867 saved_context
= pfile
->context
;
1868 saved_cur_token
= pfile
->cur_token
;
1869 saved_cur_run
= pfile
->cur_run
;
1871 pfile
->context
= XCNEW (cpp_context
);
1873 /* Inline run_directive, since we need to delay the _cpp_pop_buffer
1874 until we've read all of the tokens that we want. */
1875 cpp_push_buffer (pfile
, (const uchar
*) result
, dest
- result
,
1876 /* from_stage3 */ true);
1877 /* ??? Antique Disgusting Hack. What does this do? */
1878 if (pfile
->buffer
->prev
)
1879 pfile
->buffer
->file
= pfile
->buffer
->prev
->file
;
1881 start_directive (pfile
);
1882 _cpp_clean_line (pfile
);
1883 save_directive
= pfile
->directive
;
1884 pfile
->directive
= &dtable
[T_PRAGMA
];
1886 end_directive (pfile
, 1);
1887 pfile
->directive
= save_directive
;
1889 /* We always insert at least one token, the directive result. It'll
1890 either be a CPP_PADDING or a CPP_PRAGMA. In the later case, we
1891 need to insert *all* of the tokens, including the CPP_PRAGMA_EOL. */
1893 /* If we're not handling the pragma internally, read all of the tokens from
1894 the string buffer now, while the string buffer is still installed. */
1895 /* ??? Note that the token buffer allocated here is leaked. It's not clear
1896 to me what the true lifespan of the tokens are. It would appear that
1897 the lifespan is the entire parse of the main input stream, in which case
1898 this may not be wrong. */
1899 if (pfile
->directive_result
.type
== CPP_PRAGMA
)
1905 toks
= XNEWVEC (cpp_token
, maxcount
);
1906 toks
[0] = pfile
->directive_result
;
1910 if (count
== maxcount
)
1912 maxcount
= maxcount
* 3 / 2;
1913 toks
= XRESIZEVEC (cpp_token
, toks
, maxcount
);
1915 toks
[count
] = *cpp_get_token (pfile
);
1916 /* _Pragma is a builtin, so we're not within a macro-map, and so
1917 the token locations are set to bogus ordinary locations
1918 near to, but after that of the "_Pragma".
1919 Paper over this by setting them equal to the location of the
1920 _Pragma itself (PR preprocessor/69126). */
1921 toks
[count
].src_loc
= expansion_loc
;
1922 /* Macros have been already expanded by cpp_get_token
1923 if the pragma allowed expansion. */
1924 toks
[count
++].flags
|= NO_EXPAND
;
1926 while (toks
[count
-1].type
!= CPP_PRAGMA_EOL
);
1931 toks
= XNEW (cpp_token
);
1932 toks
[0] = pfile
->directive_result
;
1934 /* If we handled the entire pragma internally, make sure we get the
1935 line number correct for the next token. */
1936 if (pfile
->cb
.line_change
)
1937 pfile
->cb
.line_change (pfile
, pfile
->cur_token
, false);
1940 /* Finish inlining run_directive. */
1941 pfile
->buffer
->file
= NULL
;
1942 _cpp_pop_buffer (pfile
);
1944 /* Reset the old macro state before ... */
1945 XDELETE (pfile
->context
);
1946 pfile
->context
= saved_context
;
1947 pfile
->cur_token
= saved_cur_token
;
1948 pfile
->cur_run
= saved_cur_run
;
1950 /* ... inserting the new tokens we collected. */
1951 _cpp_push_token_context (pfile
, NULL
, toks
, count
);
1954 /* Handle the _Pragma operator. Return 0 on error, 1 if ok. */
1956 _cpp_do__Pragma (cpp_reader
*pfile
, location_t expansion_loc
)
1958 const cpp_token
*string
= get__Pragma_string (pfile
);
1959 pfile
->directive_result
.type
= CPP_PADDING
;
1963 destringize_and_run (pfile
, &string
->val
.str
, expansion_loc
);
1966 cpp_error (pfile
, CPP_DL_ERROR
,
1967 "_Pragma takes a parenthesized string literal");
1971 /* Handle #ifdef. */
1973 do_ifdef (cpp_reader
*pfile
)
1977 if (! pfile
->state
.skipping
)
1979 cpp_hashnode
*node
= lex_macro_node (pfile
, false);
1983 skip
= !_cpp_defined_macro_p (node
);
1984 _cpp_mark_macro_used (node
);
1985 _cpp_maybe_notify_macro_use (pfile
, node
, pfile
->directive_line
);
1987 pfile
->cb
.used (pfile
, pfile
->directive_line
, node
);
1988 check_eol (pfile
, false);
1992 push_conditional (pfile
, skip
, T_IFDEF
, 0);
1995 /* Handle #ifndef. */
1997 do_ifndef (cpp_reader
*pfile
)
2000 cpp_hashnode
*node
= 0;
2002 if (! pfile
->state
.skipping
)
2004 node
= lex_macro_node (pfile
, false);
2008 skip
= _cpp_defined_macro_p (node
);
2009 _cpp_mark_macro_used (node
);
2010 _cpp_maybe_notify_macro_use (pfile
, node
, pfile
->directive_line
);
2012 pfile
->cb
.used (pfile
, pfile
->directive_line
, node
);
2013 check_eol (pfile
, false);
2017 push_conditional (pfile
, skip
, T_IFNDEF
, node
);
2020 /* _cpp_parse_expr puts a macro in a "#if !defined ()" expression in
2021 pfile->mi_ind_cmacro so we can handle multiple-include
2022 optimizations. If macro expansion occurs in the expression, we
2023 cannot treat it as a controlling conditional, since the expansion
2024 could change in the future. That is handled by cpp_get_token. */
2026 do_if (cpp_reader
*pfile
)
2030 if (! pfile
->state
.skipping
)
2031 skip
= _cpp_parse_expr (pfile
, true) == false;
2033 push_conditional (pfile
, skip
, T_IF
, pfile
->mi_ind_cmacro
);
2036 /* Flip skipping state if appropriate and continue without changing
2037 if_stack; this is so that the error message for missing #endif's
2038 etc. will point to the original #if. */
2040 do_else (cpp_reader
*pfile
)
2042 cpp_buffer
*buffer
= pfile
->buffer
;
2043 struct if_stack
*ifs
= buffer
->if_stack
;
2046 cpp_error (pfile
, CPP_DL_ERROR
, "#else without #if");
2049 if (ifs
->type
== T_ELSE
)
2051 cpp_error (pfile
, CPP_DL_ERROR
, "#else after #else");
2052 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2053 "the conditional began here");
2057 /* Skip any future (erroneous) #elses or #elifs. */
2058 pfile
->state
.skipping
= ifs
->skip_elses
;
2059 ifs
->skip_elses
= true;
2061 /* Invalidate any controlling macro. */
2064 /* Only check EOL if was not originally skipping. */
2065 if (!ifs
->was_skipping
&& CPP_OPTION (pfile
, warn_endif_labels
))
2066 check_eol_endif_labels (pfile
);
2070 /* Handle a #elif directive by not changing if_stack either. See the
2071 comment above do_else. */
2073 do_elif (cpp_reader
*pfile
)
2075 cpp_buffer
*buffer
= pfile
->buffer
;
2076 struct if_stack
*ifs
= buffer
->if_stack
;
2079 cpp_error (pfile
, CPP_DL_ERROR
, "#elif without #if");
2082 if (ifs
->type
== T_ELSE
)
2084 cpp_error (pfile
, CPP_DL_ERROR
, "#elif after #else");
2085 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2086 "the conditional began here");
2090 /* See DR#412: "Only the first group whose control condition
2091 evaluates to true (nonzero) is processed; any following groups
2092 are skipped and their controlling directives are processed as
2093 if they were in a group that is skipped." */
2094 if (ifs
->skip_elses
)
2095 pfile
->state
.skipping
= 1;
2098 pfile
->state
.skipping
= ! _cpp_parse_expr (pfile
, false);
2099 ifs
->skip_elses
= ! pfile
->state
.skipping
;
2102 /* Invalidate any controlling macro. */
2107 /* #endif pops the if stack and resets pfile->state.skipping. */
2109 do_endif (cpp_reader
*pfile
)
2111 cpp_buffer
*buffer
= pfile
->buffer
;
2112 struct if_stack
*ifs
= buffer
->if_stack
;
2115 cpp_error (pfile
, CPP_DL_ERROR
, "#endif without #if");
2118 /* Only check EOL if was not originally skipping. */
2119 if (!ifs
->was_skipping
&& CPP_OPTION (pfile
, warn_endif_labels
))
2120 check_eol_endif_labels (pfile
);
2122 /* If potential control macro, we go back outside again. */
2123 if (ifs
->next
== 0 && ifs
->mi_cmacro
)
2125 pfile
->mi_valid
= true;
2126 pfile
->mi_cmacro
= ifs
->mi_cmacro
;
2129 buffer
->if_stack
= ifs
->next
;
2130 pfile
->state
.skipping
= ifs
->was_skipping
;
2131 obstack_free (&pfile
->buffer_ob
, ifs
);
2135 /* Push an if_stack entry for a preprocessor conditional, and set
2136 pfile->state.skipping to SKIP. If TYPE indicates the conditional
2137 is #if or #ifndef, CMACRO is a potentially controlling macro, and
2138 we need to check here that we are at the top of the file. */
2140 push_conditional (cpp_reader
*pfile
, int skip
, int type
,
2141 const cpp_hashnode
*cmacro
)
2143 struct if_stack
*ifs
;
2144 cpp_buffer
*buffer
= pfile
->buffer
;
2146 ifs
= XOBNEW (&pfile
->buffer_ob
, struct if_stack
);
2147 ifs
->line
= pfile
->directive_line
;
2148 ifs
->next
= buffer
->if_stack
;
2149 ifs
->skip_elses
= pfile
->state
.skipping
|| !skip
;
2150 ifs
->was_skipping
= pfile
->state
.skipping
;
2152 /* This condition is effectively a test for top-of-file. */
2153 if (pfile
->mi_valid
&& pfile
->mi_cmacro
== 0)
2154 ifs
->mi_cmacro
= cmacro
;
2158 pfile
->state
.skipping
= skip
;
2159 buffer
->if_stack
= ifs
;
2162 /* Read the tokens of the answer into the macro pool, in a directive
2163 of type TYPE. Only commit the memory if we intend it as permanent
2164 storage, i.e. the #assert case. Returns 0 on success, and sets
2165 ANSWERP to point to the answer. PRED_LOC is the location of the
2168 parse_answer (cpp_reader
*pfile
, int type
, location_t pred_loc
,
2169 cpp_macro
**answer_ptr
)
2171 /* In a conditional, it is legal to not have an open paren. We
2172 should save the following token in this case. */
2173 const cpp_token
*paren
= cpp_get_token (pfile
);
2175 /* If not a paren, see if we're OK. */
2176 if (paren
->type
!= CPP_OPEN_PAREN
)
2178 /* In a conditional no answer is a test for any answer. It
2179 could be followed by any token. */
2182 _cpp_backup_tokens (pfile
, 1);
2186 /* #unassert with no answer is valid - it removes all answers. */
2187 if (type
== T_UNASSERT
&& paren
->type
== CPP_EOF
)
2190 cpp_error_with_line (pfile
, CPP_DL_ERROR
, pred_loc
, 0,
2191 "missing '(' after predicate");
2195 cpp_macro
*answer
= _cpp_new_macro (pfile
, cmk_assert
,
2196 _cpp_reserve_room (pfile
, 0,
2197 sizeof (cpp_macro
)));
2198 answer
->parm
.next
= NULL
;
2202 const cpp_token
*token
= cpp_get_token (pfile
);
2204 if (token
->type
== CPP_CLOSE_PAREN
)
2207 if (token
->type
== CPP_EOF
)
2209 cpp_error (pfile
, CPP_DL_ERROR
, "missing ')' to complete answer");
2213 answer
= (cpp_macro
*)_cpp_reserve_room
2214 (pfile
, sizeof (cpp_macro
) + count
* sizeof (cpp_token
),
2215 sizeof (cpp_token
));
2216 answer
->exp
.tokens
[count
++] = *token
;
2221 cpp_error (pfile
, CPP_DL_ERROR
, "predicate's answer is empty");
2225 /* Drop whitespace at start, for answer equivalence purposes. */
2226 answer
->exp
.tokens
[0].flags
&= ~PREV_WHITE
;
2228 answer
->count
= count
;
2229 *answer_ptr
= answer
;
2234 /* Parses an assertion directive of type TYPE, returning a pointer to
2235 the hash node of the predicate, or 0 on error. The node is
2236 guaranteed to be disjoint from the macro namespace, so can only
2237 have type 'NT_VOID'. If an answer was supplied, it is placed in
2238 *ANSWER_PTR, which is otherwise set to 0. */
2239 static cpp_hashnode
*
2240 parse_assertion (cpp_reader
*pfile
, int type
, cpp_macro
**answer_ptr
)
2242 cpp_hashnode
*result
= 0;
2244 /* We don't expand predicates or answers. */
2245 pfile
->state
.prevent_expansion
++;
2249 const cpp_token
*predicate
= cpp_get_token (pfile
);
2250 if (predicate
->type
== CPP_EOF
)
2251 cpp_error (pfile
, CPP_DL_ERROR
, "assertion without predicate");
2252 else if (predicate
->type
!= CPP_NAME
)
2253 cpp_error_with_line (pfile
, CPP_DL_ERROR
, predicate
->src_loc
, 0,
2254 "predicate must be an identifier");
2255 else if (parse_answer (pfile
, type
, predicate
->src_loc
, answer_ptr
))
2257 unsigned int len
= NODE_LEN (predicate
->val
.node
.node
);
2258 unsigned char *sym
= (unsigned char *) alloca (len
+ 1);
2260 /* Prefix '#' to get it out of macro namespace. */
2262 memcpy (sym
+ 1, NODE_NAME (predicate
->val
.node
.node
), len
);
2263 result
= cpp_lookup (pfile
, sym
, len
+ 1);
2266 pfile
->state
.prevent_expansion
--;
2271 /* Returns a pointer to the pointer to CANDIDATE in the answer chain,
2272 or a pointer to NULL if the answer is not in the chain. */
2274 find_answer (cpp_hashnode
*node
, const cpp_macro
*candidate
)
2277 cpp_macro
**result
= NULL
;
2279 for (result
= &node
->value
.answers
; *result
; result
= &(*result
)->parm
.next
)
2281 cpp_macro
*answer
= *result
;
2283 if (answer
->count
== candidate
->count
)
2285 for (i
= 0; i
< answer
->count
; i
++)
2286 if (!_cpp_equiv_tokens (&answer
->exp
.tokens
[i
],
2287 &candidate
->exp
.tokens
[i
]))
2290 if (i
== answer
->count
)
2298 /* Test an assertion within a preprocessor conditional. Returns
2299 nonzero on failure, zero on success. On success, the result of
2300 the test is written into VALUE, otherwise the value 0. */
2302 _cpp_test_assertion (cpp_reader
*pfile
, unsigned int *value
)
2305 cpp_hashnode
*node
= parse_assertion (pfile
, T_IF
, &answer
);
2307 /* For recovery, an erroneous assertion expression is handled as a
2308 failing assertion. */
2313 if (node
->value
.answers
)
2314 *value
= !answer
|| *find_answer (node
, answer
);
2316 else if (pfile
->cur_token
[-1].type
== CPP_EOF
)
2317 _cpp_backup_tokens (pfile
, 1);
2319 /* We don't commit the memory for the answer - it's temporary only. */
2323 /* Handle #assert. */
2325 do_assert (cpp_reader
*pfile
)
2328 cpp_hashnode
*node
= parse_assertion (pfile
, T_ASSERT
, &answer
);
2332 /* Place the new answer in the answer list. First check there
2333 is not a duplicate. */
2334 if (*find_answer (node
, answer
))
2336 cpp_error (pfile
, CPP_DL_WARNING
, "\"%s\" re-asserted",
2337 NODE_NAME (node
) + 1);
2341 /* Commit or allocate storage for the answer. */
2342 answer
= (cpp_macro
*)_cpp_commit_buff
2343 (pfile
, sizeof (cpp_macro
) - sizeof (cpp_token
)
2344 + sizeof (cpp_token
) * answer
->count
);
2346 /* Chain into the list. */
2347 answer
->parm
.next
= node
->value
.answers
;
2348 node
->value
.answers
= answer
;
2350 check_eol (pfile
, false);
2354 /* Handle #unassert. */
2356 do_unassert (cpp_reader
*pfile
)
2359 cpp_hashnode
*node
= parse_assertion (pfile
, T_UNASSERT
, &answer
);
2361 /* It isn't an error to #unassert something that isn't asserted. */
2366 cpp_macro
**p
= find_answer (node
, answer
);
2368 /* Remove the assert from the list. */
2369 if (cpp_macro
*temp
= *p
)
2370 *p
= temp
->parm
.next
;
2372 check_eol (pfile
, false);
2375 _cpp_free_definition (node
);
2378 /* We don't commit the memory for the answer - it's temporary only. */
2381 /* These are for -D, -U, -A. */
2383 /* Process the string STR as if it appeared as the body of a #define.
2384 If STR is just an identifier, define it with value 1.
2385 If STR has anything after the identifier, then it should
2386 be identifier=definition. */
2388 cpp_define (cpp_reader
*pfile
, const char *str
)
2394 /* Copy the entire option so we can modify it.
2395 Change the first "=" in the string to a space. If there is none,
2396 tack " 1" on the end. */
2398 count
= strlen (str
);
2399 buf
= (char *) alloca (count
+ 3);
2400 memcpy (buf
, str
, count
);
2402 p
= strchr (str
, '=');
2412 run_directive (pfile
, T_DEFINE
, buf
, count
);
2416 /* Use to build macros to be run through cpp_define() as
2418 Example: cpp_define_formatted (pfile, "MACRO=%d", value); */
2421 cpp_define_formatted (cpp_reader
*pfile
, const char *fmt
, ...)
2427 ptr
= xvasprintf (fmt
, ap
);
2430 cpp_define (pfile
, ptr
);
2435 /* Slight variant of the above for use by initialize_builtins. */
2437 _cpp_define_builtin (cpp_reader
*pfile
, const char *str
)
2439 size_t len
= strlen (str
);
2440 char *buf
= (char *) alloca (len
+ 1);
2441 memcpy (buf
, str
, len
);
2443 run_directive (pfile
, T_DEFINE
, buf
, len
);
2446 /* Process MACRO as if it appeared as the body of an #undef. */
2448 cpp_undef (cpp_reader
*pfile
, const char *macro
)
2450 size_t len
= strlen (macro
);
2451 char *buf
= (char *) alloca (len
+ 1);
2452 memcpy (buf
, macro
, len
);
2454 run_directive (pfile
, T_UNDEF
, buf
, len
);
2457 /* Replace a previous definition DEF of the macro STR. If DEF is NULL,
2458 or first element is zero, then the macro should be undefined. */
2460 cpp_pop_definition (cpp_reader
*pfile
, struct def_pragma_macro
*c
)
2462 cpp_hashnode
*node
= _cpp_lex_identifier (pfile
, c
->name
);
2466 if (pfile
->cb
.before_define
)
2467 pfile
->cb
.before_define (pfile
);
2469 if (cpp_macro_p (node
))
2471 if (pfile
->cb
.undef
)
2472 pfile
->cb
.undef (pfile
, pfile
->directive_line
, node
);
2473 if (CPP_OPTION (pfile
, warn_unused_macros
))
2474 _cpp_warn_if_unused_macro (pfile
, node
, NULL
);
2475 _cpp_free_definition (node
);
2482 _cpp_restore_special_builtin (pfile
, c
);
2489 cpp_hashnode
*h
= NULL
;
2492 namelen
= ustrcspn (c
->definition
, "( \n");
2493 h
= cpp_lookup (pfile
, c
->definition
, namelen
);
2494 dn
= c
->definition
+ namelen
;
2496 nbuf
= cpp_push_buffer (pfile
, dn
, ustrchr (dn
, '\n') - dn
, true);
2499 _cpp_clean_line (pfile
);
2501 if (!_cpp_create_definition (pfile
, h
))
2503 _cpp_pop_buffer (pfile
);
2507 h
->value
.macro
->line
= c
->line
;
2508 h
->value
.macro
->syshdr
= c
->syshdr
;
2509 h
->value
.macro
->used
= c
->used
;
2513 /* Process the string STR as if it appeared as the body of a #assert. */
2515 cpp_assert (cpp_reader
*pfile
, const char *str
)
2517 handle_assertion (pfile
, str
, T_ASSERT
);
2520 /* Process STR as if it appeared as the body of an #unassert. */
2522 cpp_unassert (cpp_reader
*pfile
, const char *str
)
2524 handle_assertion (pfile
, str
, T_UNASSERT
);
2527 /* Common code for cpp_assert (-A) and cpp_unassert (-A-). */
2529 handle_assertion (cpp_reader
*pfile
, const char *str
, int type
)
2531 size_t count
= strlen (str
);
2532 const char *p
= strchr (str
, '=');
2534 /* Copy the entire option so we can modify it. Change the first
2535 "=" in the string to a '(', and tack a ')' on the end. */
2536 char *buf
= (char *) alloca (count
+ 2);
2538 memcpy (buf
, str
, count
);
2547 run_directive (pfile
, type
, str
, count
);
2550 /* The options structure. */
2552 cpp_get_options (cpp_reader
*pfile
)
2554 return &pfile
->opts
;
2557 /* The callbacks structure. */
2559 cpp_get_callbacks (cpp_reader
*pfile
)
2564 /* Copy the given callbacks structure to our own. */
2566 cpp_set_callbacks (cpp_reader
*pfile
, cpp_callbacks
*cb
)
2571 /* The dependencies structure. (Creates one if it hasn't already been.) */
2573 cpp_get_deps (cpp_reader
*pfile
)
2576 pfile
->deps
= deps_init ();
2580 /* Push a new buffer on the buffer stack. Returns the new buffer; it
2581 doesn't fail. It does not generate a file change call back; that
2582 is the responsibility of the caller. */
2584 cpp_push_buffer (cpp_reader
*pfile
, const uchar
*buffer
, size_t len
,
2587 cpp_buffer
*new_buffer
= XOBNEW (&pfile
->buffer_ob
, cpp_buffer
);
2589 /* Clears, amongst other things, if_stack and mi_cmacro. */
2590 memset (new_buffer
, 0, sizeof (cpp_buffer
));
2592 new_buffer
->next_line
= new_buffer
->buf
= buffer
;
2593 new_buffer
->rlimit
= buffer
+ len
;
2594 new_buffer
->from_stage3
= from_stage3
;
2595 new_buffer
->prev
= pfile
->buffer
;
2596 new_buffer
->need_line
= true;
2598 pfile
->buffer
= new_buffer
;
2603 /* Pops a single buffer, with a file change call-back if appropriate.
2604 Then pushes the next -include file, if any remain. */
2606 _cpp_pop_buffer (cpp_reader
*pfile
)
2608 cpp_buffer
*buffer
= pfile
->buffer
;
2609 struct _cpp_file
*inc
= buffer
->file
;
2610 struct if_stack
*ifs
;
2611 const unsigned char *to_free
;
2613 /* Walk back up the conditional stack till we reach its level at
2614 entry to this file, issuing error messages. */
2615 for (ifs
= buffer
->if_stack
; ifs
; ifs
= ifs
->next
)
2616 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2617 "unterminated #%s", dtable
[ifs
->type
].name
);
2619 /* In case of a missing #endif. */
2620 pfile
->state
.skipping
= 0;
2622 /* _cpp_do_file_change expects pfile->buffer to be the new one. */
2623 pfile
->buffer
= buffer
->prev
;
2625 to_free
= buffer
->to_free
;
2626 free (buffer
->notes
);
2628 /* Free the buffer object now; we may want to push a new buffer
2629 in _cpp_push_next_include_file. */
2630 obstack_free (&pfile
->buffer_ob
, buffer
);
2634 _cpp_pop_file_buffer (pfile
, inc
, to_free
);
2636 _cpp_do_file_change (pfile
, LC_LEAVE
, 0, 0, 0);
2639 free ((void *)to_free
);
2642 /* Enter all recognized directives in the hash table. */
2644 _cpp_init_directives (cpp_reader
*pfile
)
2646 for (int i
= 0; i
< N_DIRECTIVES
; i
++)
2648 cpp_hashnode
*node
= cpp_lookup (pfile
, dtable
[i
].name
, dtable
[i
].length
);
2649 node
->is_directive
= 1;
2650 node
->directive_index
= i
;
2654 /* Extract header file from a bracket include. Parsing starts after '<'.
2655 The string is malloced and must be freed by the caller. */
2657 _cpp_bracket_include(cpp_reader
*pfile
)
2659 return glue_header_name (pfile
);