1 /* CPP Library. (Directive handling.)
2 Copyright (C) 1986-2019 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
;
598 if (is_def_or_undef
&& node
== pfile
->spec_nodes
.n_defined
)
599 cpp_error (pfile
, CPP_DL_ERROR
,
600 "\"defined\" cannot be used as a macro name");
601 else if (is_def_or_undef
602 && (node
== pfile
->spec_nodes
.n__has_include__
603 || node
== pfile
->spec_nodes
.n__has_include_next__
))
604 cpp_error (pfile
, CPP_DL_ERROR
,
605 "\"__has_include__\" cannot be used as a macro name");
606 else if (! (node
->flags
& NODE_POISONED
))
609 else if (token
->flags
& NAMED_OP
)
610 cpp_error (pfile
, CPP_DL_ERROR
,
611 "\"%s\" cannot be used as a macro name as it is an operator in C++",
612 NODE_NAME (token
->val
.node
.node
));
613 else if (token
->type
== CPP_EOF
)
614 cpp_error (pfile
, CPP_DL_ERROR
, "no macro name given in #%s directive",
615 pfile
->directive
->name
);
617 cpp_error (pfile
, CPP_DL_ERROR
, "macro names must be identifiers");
622 /* Process a #define directive. Most work is done in macro.c. */
624 do_define (cpp_reader
*pfile
)
626 cpp_hashnode
*node
= lex_macro_node (pfile
, true);
630 /* If we have been requested to expand comments into macros,
631 then re-enable saving of comments. */
632 pfile
->state
.save_comments
=
633 ! CPP_OPTION (pfile
, discard_comments_in_macro_exp
);
635 if (pfile
->cb
.before_define
)
636 pfile
->cb
.before_define (pfile
);
638 if (_cpp_create_definition (pfile
, node
))
639 if (pfile
->cb
.define
)
640 pfile
->cb
.define (pfile
, pfile
->directive_line
, node
);
642 node
->flags
&= ~NODE_USED
;
646 /* Handle #undef. Mark the identifier NT_VOID in the hash table. */
648 do_undef (cpp_reader
*pfile
)
650 cpp_hashnode
*node
= lex_macro_node (pfile
, true);
654 if (pfile
->cb
.before_define
)
655 pfile
->cb
.before_define (pfile
);
658 pfile
->cb
.undef (pfile
, pfile
->directive_line
, node
);
660 /* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified
661 identifier is not currently defined as a macro name. */
662 if (cpp_macro_p (node
))
664 if (node
->flags
& NODE_WARN
)
665 cpp_error (pfile
, CPP_DL_WARNING
,
666 "undefining \"%s\"", NODE_NAME (node
));
667 else if (cpp_builtin_macro_p (node
)
668 && CPP_OPTION (pfile
, warn_builtin_macro_redefined
))
669 cpp_warning_with_line (pfile
, CPP_W_BUILTIN_MACRO_REDEFINED
,
670 pfile
->directive_line
, 0,
671 "undefining \"%s\"", NODE_NAME (node
));
673 if (CPP_OPTION (pfile
, warn_unused_macros
))
674 _cpp_warn_if_unused_macro (pfile
, node
, NULL
);
676 _cpp_free_definition (node
);
680 check_eol (pfile
, false);
683 /* Undefine a single macro/assertion/whatever. */
686 undefine_macros (cpp_reader
*pfile ATTRIBUTE_UNUSED
, cpp_hashnode
*h
,
687 void *data_p ATTRIBUTE_UNUSED
)
689 /* Body of _cpp_free_definition inlined here for speed.
690 Macros and assertions no longer have anything to free. */
692 h
->value
.answers
= NULL
;
693 h
->flags
&= ~(NODE_POISONED
|NODE_DISABLED
|NODE_USED
);
697 /* Undefine all macros and assertions. */
700 cpp_undef_all (cpp_reader
*pfile
)
702 cpp_forall_identifiers (pfile
, undefine_macros
, NULL
);
706 /* Helper routine used by parse_include. Reinterpret the current line
707 as an h-char-sequence (< ... >); we are looking at the first token
708 after the <. Returns a malloced filename. */
710 glue_header_name (cpp_reader
*pfile
)
712 const cpp_token
*token
;
714 size_t len
, total_len
= 0, capacity
= 1024;
716 /* To avoid lexed tokens overwriting our glued name, we can only
717 allocate from the string pool once we've lexed everything. */
718 buffer
= XNEWVEC (char, capacity
);
721 token
= get_token_no_padding (pfile
);
723 if (token
->type
== CPP_GREATER
)
725 if (token
->type
== CPP_EOF
)
727 cpp_error (pfile
, CPP_DL_ERROR
, "missing terminating > character");
731 len
= cpp_token_len (token
) + 2; /* Leading space, terminating \0. */
732 if (total_len
+ len
> capacity
)
734 capacity
= (capacity
+ len
) * 2;
735 buffer
= XRESIZEVEC (char, buffer
, capacity
);
738 if (token
->flags
& PREV_WHITE
)
739 buffer
[total_len
++] = ' ';
741 total_len
= (cpp_spell_token (pfile
, token
, (uchar
*) &buffer
[total_len
],
746 buffer
[total_len
] = '\0';
750 /* Returns the file name of #include, #include_next, #import and
751 #pragma dependency. The string is malloced and the caller should
752 free it. Returns NULL on error. LOCATION is the source location
756 parse_include (cpp_reader
*pfile
, int *pangle_brackets
,
757 const cpp_token
***buf
, location_t
*location
)
760 const cpp_token
*header
;
762 /* Allow macro expansion. */
763 header
= get_token_no_padding (pfile
);
764 *location
= header
->src_loc
;
765 if ((header
->type
== CPP_STRING
&& header
->val
.str
.text
[0] != 'R')
766 || header
->type
== CPP_HEADER_NAME
)
768 fname
= XNEWVEC (char, header
->val
.str
.len
- 1);
769 memcpy (fname
, header
->val
.str
.text
+ 1, header
->val
.str
.len
- 2);
770 fname
[header
->val
.str
.len
- 2] = '\0';
771 *pangle_brackets
= header
->type
== CPP_HEADER_NAME
;
773 else if (header
->type
== CPP_LESS
)
775 fname
= glue_header_name (pfile
);
776 *pangle_brackets
= 1;
780 const unsigned char *dir
;
782 if (pfile
->directive
== &dtable
[T_PRAGMA
])
783 dir
= UC
"pragma dependency";
785 dir
= pfile
->directive
->name
;
786 cpp_error (pfile
, CPP_DL_ERROR
, "#%s expects \"FILENAME\" or <FILENAME>",
792 if (pfile
->directive
== &dtable
[T_PRAGMA
])
794 /* This pragma allows extra tokens after the file name. */
796 else if (buf
== NULL
|| CPP_OPTION (pfile
, discard_comments
))
797 check_eol (pfile
, true);
800 /* If we are not discarding comments, then gather them while
801 doing the eol check. */
802 *buf
= check_eol_return_comments (pfile
);
808 /* Handle #include, #include_next and #import. */
810 do_include_common (cpp_reader
*pfile
, enum include_type type
)
814 const cpp_token
**buf
= NULL
;
817 /* Re-enable saving of comments if requested, so that the include
818 callback can dump comments which follow #include. */
819 pfile
->state
.save_comments
= ! CPP_OPTION (pfile
, discard_comments
);
821 fname
= parse_include (pfile
, &angle_brackets
, &buf
, &location
);
827 cpp_error_with_line (pfile
, CPP_DL_ERROR
, location
, 0,
828 "empty filename in #%s",
829 pfile
->directive
->name
);
833 /* Prevent #include recursion. */
834 if (pfile
->line_table
->depth
>= CPP_OPTION (pfile
, max_include_depth
))
837 "#include nested depth %u exceeds maximum of %u"
838 " (use -fmax-include-depth=DEPTH to increase the maximum)",
839 pfile
->line_table
->depth
,
840 CPP_OPTION (pfile
, max_include_depth
));
843 /* Get out of macro context, if we are. */
844 skip_rest_of_line (pfile
);
846 if (pfile
->cb
.include
)
847 pfile
->cb
.include (pfile
, pfile
->directive_line
,
848 pfile
->directive
->name
, fname
, angle_brackets
,
851 _cpp_stack_include (pfile
, fname
, angle_brackets
, type
, location
);
861 do_include (cpp_reader
*pfile
)
863 do_include_common (pfile
, IT_INCLUDE
);
867 do_import (cpp_reader
*pfile
)
869 do_include_common (pfile
, IT_IMPORT
);
873 do_include_next (cpp_reader
*pfile
)
875 enum include_type type
= IT_INCLUDE_NEXT
;
877 /* If this is the primary source file, warn and use the normal
879 if (cpp_in_primary_file (pfile
))
881 cpp_error (pfile
, CPP_DL_WARNING
,
882 "#include_next in primary source file");
885 do_include_common (pfile
, type
);
888 /* Subroutine of do_linemarker. Read possible flags after file name.
889 LAST is the last flag seen; 0 if this is the first flag. Return the
890 flag if it is valid, 0 at the end of the directive. Otherwise
893 read_flag (cpp_reader
*pfile
, unsigned int last
)
895 const cpp_token
*token
= _cpp_lex_token (pfile
);
897 if (token
->type
== CPP_NUMBER
&& token
->val
.str
.len
== 1)
899 unsigned int flag
= token
->val
.str
.text
[0] - '0';
901 if (flag
> last
&& flag
<= 4
902 && (flag
!= 4 || last
== 3)
903 && (flag
!= 2 || last
== 0))
907 if (token
->type
!= CPP_EOF
)
908 cpp_error (pfile
, CPP_DL_ERROR
, "invalid flag \"%s\" in line directive",
909 cpp_token_as_text (pfile
, token
));
913 /* Subroutine of do_line and do_linemarker. Convert a number in STR,
914 of length LEN, to binary; store it in NUMP, and return false if the
915 number was well-formed, true if not. WRAPPED is set to true if the
916 number did not fit into 'unsigned long'. */
918 strtolinenum (const uchar
*str
, size_t len
, linenum_type
*nump
, bool *wrapped
)
920 linenum_type reg
= 0;
921 linenum_type reg_prev
= 0;
940 /* Interpret #line command.
941 Note that the filename string (if any) is a true string constant
942 (escapes are interpreted), unlike in #line. */
944 do_line (cpp_reader
*pfile
)
946 class line_maps
*line_table
= pfile
->line_table
;
947 const line_map_ordinary
*map
= LINEMAPS_LAST_ORDINARY_MAP (line_table
);
949 /* skip_rest_of_line() may cause line table to be realloc()ed so note down
952 unsigned char map_sysp
= ORDINARY_MAP_IN_SYSTEM_HEADER_P (map
);
953 const cpp_token
*token
;
954 const char *new_file
= ORDINARY_MAP_FILE_NAME (map
);
955 linenum_type new_lineno
;
957 /* C99 raised the minimum limit on #line numbers. */
958 linenum_type cap
= CPP_OPTION (pfile
, c99
) ? 2147483647 : 32767;
961 /* #line commands expand macros. */
962 token
= cpp_get_token (pfile
);
963 if (token
->type
!= CPP_NUMBER
964 || strtolinenum (token
->val
.str
.text
, token
->val
.str
.len
,
965 &new_lineno
, &wrapped
))
967 if (token
->type
== CPP_EOF
)
968 cpp_error (pfile
, CPP_DL_ERROR
, "unexpected end of file after #line");
970 cpp_error (pfile
, CPP_DL_ERROR
,
971 "\"%s\" after #line is not a positive integer",
972 cpp_token_as_text (pfile
, token
));
976 if (CPP_PEDANTIC (pfile
) && (new_lineno
== 0 || new_lineno
> cap
|| wrapped
))
977 cpp_error (pfile
, CPP_DL_PEDWARN
, "line number out of range");
979 cpp_error (pfile
, CPP_DL_WARNING
, "line number out of range");
981 token
= cpp_get_token (pfile
);
982 if (token
->type
== CPP_STRING
)
984 cpp_string s
= { 0, 0 };
985 if (cpp_interpret_string_notranslate (pfile
, &token
->val
.str
, 1,
987 new_file
= (const char *)s
.text
;
988 check_eol (pfile
, true);
990 else if (token
->type
!= CPP_EOF
)
992 cpp_error (pfile
, CPP_DL_ERROR
, "\"%s\" is not a valid filename",
993 cpp_token_as_text (pfile
, token
));
997 skip_rest_of_line (pfile
);
998 _cpp_do_file_change (pfile
, LC_RENAME_VERBATIM
, new_file
, new_lineno
,
1000 line_table
->seen_line_directive
= true;
1003 /* Interpret the # 44 "file" [flags] notation, which has slightly
1004 different syntax and semantics from #line: Flags are allowed,
1005 and we never complain about the line number being too big. */
1007 do_linemarker (cpp_reader
*pfile
)
1009 class line_maps
*line_table
= pfile
->line_table
;
1010 const line_map_ordinary
*map
= LINEMAPS_LAST_ORDINARY_MAP (line_table
);
1011 const cpp_token
*token
;
1012 const char *new_file
= ORDINARY_MAP_FILE_NAME (map
);
1013 linenum_type new_lineno
;
1014 unsigned int new_sysp
= ORDINARY_MAP_IN_SYSTEM_HEADER_P (map
);
1015 enum lc_reason reason
= LC_RENAME_VERBATIM
;
1019 /* Back up so we can get the number again. Putting this in
1020 _cpp_handle_directive risks two calls to _cpp_backup_tokens in
1021 some circumstances, which can segfault. */
1022 _cpp_backup_tokens (pfile
, 1);
1024 /* #line commands expand macros. */
1025 token
= cpp_get_token (pfile
);
1026 if (token
->type
!= CPP_NUMBER
1027 || strtolinenum (token
->val
.str
.text
, token
->val
.str
.len
,
1028 &new_lineno
, &wrapped
))
1030 /* Unlike #line, there does not seem to be a way to get an EOF
1031 here. So, it should be safe to always spell the token. */
1032 cpp_error (pfile
, CPP_DL_ERROR
,
1033 "\"%s\" after # is not a positive integer",
1034 cpp_token_as_text (pfile
, token
));
1038 token
= cpp_get_token (pfile
);
1039 if (token
->type
== CPP_STRING
)
1041 cpp_string s
= { 0, 0 };
1042 if (cpp_interpret_string_notranslate (pfile
, &token
->val
.str
,
1044 new_file
= (const char *)s
.text
;
1047 flag
= read_flag (pfile
, 0);
1051 /* Fake an include for cpp_included (). */
1052 _cpp_fake_include (pfile
, new_file
);
1053 flag
= read_flag (pfile
, flag
);
1058 flag
= read_flag (pfile
, flag
);
1063 flag
= read_flag (pfile
, flag
);
1067 pfile
->buffer
->sysp
= new_sysp
;
1069 check_eol (pfile
, false);
1071 else if (token
->type
!= CPP_EOF
)
1073 cpp_error (pfile
, CPP_DL_ERROR
, "\"%s\" is not a valid filename",
1074 cpp_token_as_text (pfile
, token
));
1078 skip_rest_of_line (pfile
);
1080 if (reason
== LC_LEAVE
)
1082 /* Reread map since cpp_get_token can invalidate it with a
1084 map
= LINEMAPS_LAST_ORDINARY_MAP (line_table
);
1085 const line_map_ordinary
*from
1086 = linemap_included_from_linemap (line_table
, map
);
1087 if (MAIN_FILE_P (map
)
1089 && filename_cmp (ORDINARY_MAP_FILE_NAME (from
), new_file
) != 0))
1091 cpp_warning (pfile
, CPP_W_NONE
,
1092 "file \"%s\" linemarker ignored due to "
1093 "incorrect nesting", new_file
);
1097 /* Compensate for the increment in linemap_add that occurs in
1098 _cpp_do_file_change. We're currently at the start of the line
1099 *following* the #line directive. A separate location_t for this
1100 location makes no sense (until we do the LC_LEAVE), and
1101 complicates LAST_SOURCE_LINE_LOCATION. */
1102 pfile
->line_table
->highest_location
--;
1104 _cpp_do_file_change (pfile
, reason
, new_file
, new_lineno
, new_sysp
);
1105 line_table
->seen_line_directive
= true;
1108 /* Arrange the file_change callback. pfile->line has changed to
1109 FILE_LINE of TO_FILE, for reason REASON. SYSP is 1 for a system
1110 header, 2 for a system header that needs to be extern "C" protected,
1111 and zero otherwise. */
1113 _cpp_do_file_change (cpp_reader
*pfile
, enum lc_reason reason
,
1114 const char *to_file
, linenum_type file_line
,
1117 linemap_assert (reason
!= LC_ENTER_MACRO
);
1118 const struct line_map
*map
= linemap_add (pfile
->line_table
, reason
, sysp
,
1119 to_file
, file_line
);
1120 const line_map_ordinary
*ord_map
= NULL
;
1123 ord_map
= linemap_check_ordinary (map
);
1124 linemap_line_start (pfile
->line_table
,
1125 ORDINARY_MAP_STARTING_LINE_NUMBER (ord_map
),
1129 if (pfile
->cb
.file_change
)
1130 pfile
->cb
.file_change (pfile
, ord_map
);
1133 /* Report a warning or error detected by the program we are
1134 processing. Use the directive's tokens in the error message. */
1136 do_diagnostic (cpp_reader
*pfile
, enum cpp_diagnostic_level code
,
1137 enum cpp_warning_reason reason
, int print_dir
)
1139 const unsigned char *dir_name
;
1140 unsigned char *line
;
1141 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1144 dir_name
= pfile
->directive
->name
;
1147 pfile
->state
.prevent_expansion
++;
1148 line
= cpp_output_line_to_string (pfile
, dir_name
);
1149 pfile
->state
.prevent_expansion
--;
1151 if (code
== CPP_DL_WARNING_SYSHDR
&& reason
)
1152 cpp_warning_with_line_syshdr (pfile
, reason
, src_loc
, 0, "%s", line
);
1153 else if (code
== CPP_DL_WARNING
&& reason
)
1154 cpp_warning_with_line (pfile
, reason
, src_loc
, 0, "%s", line
);
1156 cpp_error_with_line (pfile
, code
, src_loc
, 0, "%s", line
);
1161 do_error (cpp_reader
*pfile
)
1163 do_diagnostic (pfile
, CPP_DL_ERROR
, CPP_W_NONE
, 1);
1167 do_warning (cpp_reader
*pfile
)
1169 /* We want #warning diagnostics to be emitted in system headers too. */
1170 do_diagnostic (pfile
, CPP_DL_WARNING_SYSHDR
, CPP_W_WARNING_DIRECTIVE
, 1);
1173 /* Report program identification. */
1175 do_ident (cpp_reader
*pfile
)
1177 const cpp_token
*str
= cpp_get_token (pfile
);
1179 if (str
->type
!= CPP_STRING
)
1180 cpp_error (pfile
, CPP_DL_ERROR
, "invalid #%s directive",
1181 pfile
->directive
->name
);
1182 else if (pfile
->cb
.ident
)
1183 pfile
->cb
.ident (pfile
, pfile
->directive_line
, &str
->val
.str
);
1185 check_eol (pfile
, false);
1188 /* Lookup a PRAGMA name in a singly-linked CHAIN. Returns the
1189 matching entry, or NULL if none is found. The returned entry could
1190 be the start of a namespace chain, or a pragma. */
1191 static struct pragma_entry
*
1192 lookup_pragma_entry (struct pragma_entry
*chain
, const cpp_hashnode
*pragma
)
1194 while (chain
&& chain
->pragma
!= pragma
)
1195 chain
= chain
->next
;
1200 /* Create and insert a blank pragma entry at the beginning of a
1201 singly-linked CHAIN. */
1202 static struct pragma_entry
*
1203 new_pragma_entry (cpp_reader
*pfile
, struct pragma_entry
**chain
)
1205 struct pragma_entry
*new_entry
;
1207 new_entry
= (struct pragma_entry
*)
1208 _cpp_aligned_alloc (pfile
, sizeof (struct pragma_entry
));
1210 memset (new_entry
, 0, sizeof (struct pragma_entry
));
1211 new_entry
->next
= *chain
;
1217 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1218 goes in the global namespace. */
1219 static struct pragma_entry
*
1220 register_pragma_1 (cpp_reader
*pfile
, const char *space
, const char *name
,
1221 bool allow_name_expansion
)
1223 struct pragma_entry
**chain
= &pfile
->pragmas
;
1224 struct pragma_entry
*entry
;
1225 const cpp_hashnode
*node
;
1229 node
= cpp_lookup (pfile
, UC space
, strlen (space
));
1230 entry
= lookup_pragma_entry (*chain
, node
);
1233 entry
= new_pragma_entry (pfile
, chain
);
1234 entry
->pragma
= node
;
1235 entry
->is_nspace
= true;
1236 entry
->allow_expansion
= allow_name_expansion
;
1238 else if (!entry
->is_nspace
)
1240 else if (entry
->allow_expansion
!= allow_name_expansion
)
1242 cpp_error (pfile
, CPP_DL_ICE
,
1243 "registering pragmas in namespace \"%s\" with mismatched "
1244 "name expansion", space
);
1247 chain
= &entry
->u
.space
;
1249 else if (allow_name_expansion
)
1251 cpp_error (pfile
, CPP_DL_ICE
,
1252 "registering pragma \"%s\" with name expansion "
1253 "and no namespace", name
);
1257 /* Check for duplicates. */
1258 node
= cpp_lookup (pfile
, UC name
, strlen (name
));
1259 entry
= lookup_pragma_entry (*chain
, node
);
1262 entry
= new_pragma_entry (pfile
, chain
);
1263 entry
->pragma
= node
;
1267 if (entry
->is_nspace
)
1269 cpp_error (pfile
, CPP_DL_ICE
,
1270 "registering \"%s\" as both a pragma and a pragma namespace",
1273 cpp_error (pfile
, CPP_DL_ICE
, "#pragma %s %s is already registered",
1276 cpp_error (pfile
, CPP_DL_ICE
, "#pragma %s is already registered", name
);
1281 /* Register a cpplib internal pragma SPACE NAME with HANDLER. */
1283 register_pragma_internal (cpp_reader
*pfile
, const char *space
,
1284 const char *name
, pragma_cb handler
)
1286 struct pragma_entry
*entry
;
1288 entry
= register_pragma_1 (pfile
, space
, name
, false);
1289 entry
->is_internal
= true;
1290 entry
->u
.handler
= handler
;
1293 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1294 goes in the global namespace. HANDLER is the handler it will call,
1295 which must be non-NULL. If ALLOW_EXPANSION is set, allow macro
1296 expansion while parsing pragma NAME. This function is exported
1299 cpp_register_pragma (cpp_reader
*pfile
, const char *space
, const char *name
,
1300 pragma_cb handler
, bool allow_expansion
)
1302 struct pragma_entry
*entry
;
1306 cpp_error (pfile
, CPP_DL_ICE
, "registering pragma with NULL handler");
1310 entry
= register_pragma_1 (pfile
, space
, name
, false);
1313 entry
->allow_expansion
= allow_expansion
;
1314 entry
->u
.handler
= handler
;
1318 /* Similarly, but create mark the pragma for deferred processing.
1319 When found, a CPP_PRAGMA token will be insertted into the stream
1320 with IDENT in the token->u.pragma slot. */
1322 cpp_register_deferred_pragma (cpp_reader
*pfile
, const char *space
,
1323 const char *name
, unsigned int ident
,
1324 bool allow_expansion
, bool allow_name_expansion
)
1326 struct pragma_entry
*entry
;
1328 entry
= register_pragma_1 (pfile
, space
, name
, allow_name_expansion
);
1331 entry
->is_deferred
= true;
1332 entry
->allow_expansion
= allow_expansion
;
1333 entry
->u
.ident
= ident
;
1337 /* Register the pragmas the preprocessor itself handles. */
1339 _cpp_init_internal_pragmas (cpp_reader
*pfile
)
1341 /* Pragmas in the global namespace. */
1342 register_pragma_internal (pfile
, 0, "once", do_pragma_once
);
1343 register_pragma_internal (pfile
, 0, "push_macro", do_pragma_push_macro
);
1344 register_pragma_internal (pfile
, 0, "pop_macro", do_pragma_pop_macro
);
1346 /* New GCC-specific pragmas should be put in the GCC namespace. */
1347 register_pragma_internal (pfile
, "GCC", "poison", do_pragma_poison
);
1348 register_pragma_internal (pfile
, "GCC", "system_header",
1349 do_pragma_system_header
);
1350 register_pragma_internal (pfile
, "GCC", "dependency", do_pragma_dependency
);
1351 register_pragma_internal (pfile
, "GCC", "warning", do_pragma_warning
);
1352 register_pragma_internal (pfile
, "GCC", "error", do_pragma_error
);
1355 /* Return the number of registered pragmas in PE. */
1358 count_registered_pragmas (struct pragma_entry
*pe
)
1361 for (; pe
!= NULL
; pe
= pe
->next
)
1364 ct
+= count_registered_pragmas (pe
->u
.space
);
1370 /* Save into SD the names of the registered pragmas referenced by PE,
1371 and return a pointer to the next free space in SD. */
1374 save_registered_pragmas (struct pragma_entry
*pe
, char **sd
)
1376 for (; pe
!= NULL
; pe
= pe
->next
)
1379 sd
= save_registered_pragmas (pe
->u
.space
, sd
);
1380 *sd
++ = (char *) xmemdup (HT_STR (&pe
->pragma
->ident
),
1381 HT_LEN (&pe
->pragma
->ident
),
1382 HT_LEN (&pe
->pragma
->ident
) + 1);
1387 /* Return a newly-allocated array which saves the names of the
1388 registered pragmas. */
1391 _cpp_save_pragma_names (cpp_reader
*pfile
)
1393 int ct
= count_registered_pragmas (pfile
->pragmas
);
1394 char **result
= XNEWVEC (char *, ct
);
1395 (void) save_registered_pragmas (pfile
->pragmas
, result
);
1399 /* Restore from SD the names of the registered pragmas referenced by PE,
1400 and return a pointer to the next unused name in SD. */
1403 restore_registered_pragmas (cpp_reader
*pfile
, struct pragma_entry
*pe
,
1406 for (; pe
!= NULL
; pe
= pe
->next
)
1409 sd
= restore_registered_pragmas (pfile
, pe
->u
.space
, sd
);
1410 pe
->pragma
= cpp_lookup (pfile
, UC
*sd
, strlen (*sd
));
1417 /* Restore the names of the registered pragmas from SAVED. */
1420 _cpp_restore_pragma_names (cpp_reader
*pfile
, char **saved
)
1422 (void) restore_registered_pragmas (pfile
, pfile
->pragmas
, saved
);
1426 /* Pragmata handling. We handle some, and pass the rest on to the
1427 front end. C99 defines three pragmas and says that no macro
1428 expansion is to be performed on them; whether or not macro
1429 expansion happens for other pragmas is implementation defined.
1430 This implementation allows for a mix of both, since GCC did not
1431 traditionally macro expand its (few) pragmas, whereas OpenMP
1432 specifies that macro expansion should happen. */
1434 do_pragma (cpp_reader
*pfile
)
1436 const struct pragma_entry
*p
= NULL
;
1437 const cpp_token
*token
, *pragma_token
;
1438 location_t pragma_token_virt_loc
= 0;
1440 unsigned int count
= 1;
1442 pfile
->state
.prevent_expansion
++;
1444 pragma_token
= token
= cpp_get_token_with_location (pfile
,
1445 &pragma_token_virt_loc
);
1447 if (token
->type
== CPP_NAME
)
1449 p
= lookup_pragma_entry (pfile
->pragmas
, token
->val
.node
.node
);
1450 if (p
&& p
->is_nspace
)
1452 bool allow_name_expansion
= p
->allow_expansion
;
1453 if (allow_name_expansion
)
1454 pfile
->state
.prevent_expansion
--;
1456 token
= cpp_get_token (pfile
);
1457 if (token
->type
== CPP_NAME
)
1458 p
= lookup_pragma_entry (p
->u
.space
, token
->val
.node
.node
);
1461 if (allow_name_expansion
)
1462 pfile
->state
.prevent_expansion
++;
1471 pfile
->directive_result
.src_loc
= pragma_token_virt_loc
;
1472 pfile
->directive_result
.type
= CPP_PRAGMA
;
1473 pfile
->directive_result
.flags
= pragma_token
->flags
;
1474 pfile
->directive_result
.val
.pragma
= p
->u
.ident
;
1475 pfile
->state
.in_deferred_pragma
= true;
1476 pfile
->state
.pragma_allow_expansion
= p
->allow_expansion
;
1477 if (!p
->allow_expansion
)
1478 pfile
->state
.prevent_expansion
++;
1482 /* Since the handler below doesn't get the line number, that
1483 it might need for diagnostics, make sure it has the right
1484 numbers in place. */
1485 if (pfile
->cb
.line_change
)
1486 (*pfile
->cb
.line_change
) (pfile
, pragma_token
, false);
1487 if (p
->allow_expansion
)
1488 pfile
->state
.prevent_expansion
--;
1489 (*p
->u
.handler
) (pfile
);
1490 if (p
->allow_expansion
)
1491 pfile
->state
.prevent_expansion
++;
1494 else if (pfile
->cb
.def_pragma
)
1496 if (count
== 1 || pfile
->context
->prev
== NULL
)
1497 _cpp_backup_tokens (pfile
, count
);
1500 /* Invalid name comes from macro expansion, _cpp_backup_tokens
1501 won't allow backing 2 tokens. */
1502 /* ??? The token buffer is leaked. Perhaps if def_pragma hook
1503 reads both tokens, we could perhaps free it, but if it doesn't,
1504 we don't know the exact lifespan. */
1505 cpp_token
*toks
= XNEWVEC (cpp_token
, 2);
1507 toks
[0].flags
|= NO_EXPAND
;
1509 toks
[1].flags
|= NO_EXPAND
;
1510 _cpp_push_token_context (pfile
, NULL
, toks
, 2);
1512 pfile
->cb
.def_pragma (pfile
, pfile
->directive_line
);
1515 pfile
->state
.prevent_expansion
--;
1518 /* Handle #pragma once. */
1520 do_pragma_once (cpp_reader
*pfile
)
1522 if (cpp_in_primary_file (pfile
))
1523 cpp_error (pfile
, CPP_DL_WARNING
, "#pragma once in main file");
1525 check_eol (pfile
, false);
1526 _cpp_mark_file_once_only (pfile
, pfile
->buffer
->file
);
1529 /* Handle #pragma push_macro(STRING). */
1531 do_pragma_push_macro (cpp_reader
*pfile
)
1535 const uchar
*defn
= NULL
;
1536 char *macroname
, *dest
;
1537 const char *limit
, *src
;
1538 const cpp_token
*txt
;
1539 struct def_pragma_macro
*c
;
1541 txt
= get__Pragma_string (pfile
);
1544 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1545 cpp_error_with_line (pfile
, CPP_DL_ERROR
, src_loc
, 0,
1546 "invalid #pragma push_macro directive");
1547 check_eol (pfile
, false);
1548 skip_rest_of_line (pfile
);
1551 dest
= macroname
= (char *) alloca (txt
->val
.str
.len
+ 2);
1552 src
= (const char *) (txt
->val
.str
.text
+ 1 + (txt
->val
.str
.text
[0] == 'L'));
1553 limit
= (const char *) (txt
->val
.str
.text
+ txt
->val
.str
.len
- 1);
1556 /* We know there is a character following the backslash. */
1557 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1562 check_eol (pfile
, false);
1563 skip_rest_of_line (pfile
);
1564 c
= XNEW (struct def_pragma_macro
);
1565 memset (c
, 0, sizeof (struct def_pragma_macro
));
1566 c
->name
= XNEWVAR (char, strlen (macroname
) + 1);
1567 strcpy (c
->name
, macroname
);
1568 c
->next
= pfile
->pushed_macros
;
1569 node
= _cpp_lex_identifier (pfile
, c
->name
);
1570 if (node
->type
== NT_VOID
)
1574 defn
= cpp_macro_definition (pfile
, node
);
1575 defnlen
= ustrlen (defn
);
1576 c
->definition
= XNEWVEC (uchar
, defnlen
+ 2);
1577 c
->definition
[defnlen
] = '\n';
1578 c
->definition
[defnlen
+ 1] = 0;
1579 c
->line
= node
->value
.macro
->line
;
1580 c
->syshdr
= node
->value
.macro
->syshdr
;
1581 c
->used
= node
->value
.macro
->used
;
1582 memcpy (c
->definition
, defn
, defnlen
);
1585 pfile
->pushed_macros
= c
;
1588 /* Handle #pragma pop_macro(STRING). */
1590 do_pragma_pop_macro (cpp_reader
*pfile
)
1592 char *macroname
, *dest
;
1593 const char *limit
, *src
;
1594 const cpp_token
*txt
;
1595 struct def_pragma_macro
*l
= NULL
, *c
= pfile
->pushed_macros
;
1596 txt
= get__Pragma_string (pfile
);
1599 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1600 cpp_error_with_line (pfile
, CPP_DL_ERROR
, src_loc
, 0,
1601 "invalid #pragma pop_macro directive");
1602 check_eol (pfile
, false);
1603 skip_rest_of_line (pfile
);
1606 dest
= macroname
= (char *) alloca (txt
->val
.str
.len
+ 2);
1607 src
= (const char *) (txt
->val
.str
.text
+ 1 + (txt
->val
.str
.text
[0] == 'L'));
1608 limit
= (const char *) (txt
->val
.str
.text
+ txt
->val
.str
.len
- 1);
1611 /* We know there is a character following the backslash. */
1612 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1617 check_eol (pfile
, false);
1618 skip_rest_of_line (pfile
);
1622 if (!strcmp (c
->name
, macroname
))
1625 pfile
->pushed_macros
= c
->next
;
1628 cpp_pop_definition (pfile
, c
);
1629 free (c
->definition
);
1639 /* Handle #pragma GCC poison, to poison one or more identifiers so
1640 that the lexer produces a hard error for each subsequent usage. */
1642 do_pragma_poison (cpp_reader
*pfile
)
1644 const cpp_token
*tok
;
1647 pfile
->state
.poisoned_ok
= 1;
1650 tok
= _cpp_lex_token (pfile
);
1651 if (tok
->type
== CPP_EOF
)
1653 if (tok
->type
!= CPP_NAME
)
1655 cpp_error (pfile
, CPP_DL_ERROR
,
1656 "invalid #pragma GCC poison directive");
1660 hp
= tok
->val
.node
.node
;
1661 if (hp
->flags
& NODE_POISONED
)
1664 if (cpp_macro_p (hp
))
1665 cpp_error (pfile
, CPP_DL_WARNING
, "poisoning existing macro \"%s\"",
1667 _cpp_free_definition (hp
);
1668 hp
->flags
|= NODE_POISONED
| NODE_DIAGNOSTIC
;
1670 pfile
->state
.poisoned_ok
= 0;
1673 /* Mark the current header as a system header. This will suppress
1674 some categories of warnings (notably those from -pedantic). It is
1675 intended for use in system libraries that cannot be implemented in
1676 conforming C, but cannot be certain that their headers appear in a
1677 system include directory. To prevent abuse, it is rejected in the
1678 primary source file. */
1680 do_pragma_system_header (cpp_reader
*pfile
)
1682 if (cpp_in_primary_file (pfile
))
1683 cpp_error (pfile
, CPP_DL_WARNING
,
1684 "#pragma system_header ignored outside include file");
1687 check_eol (pfile
, false);
1688 skip_rest_of_line (pfile
);
1689 cpp_make_system_header (pfile
, 1, 0);
1693 /* Check the modified date of the current include file against a specified
1694 file. Issue a diagnostic, if the specified file is newer. We use this to
1695 determine if a fixed header should be refixed. */
1697 do_pragma_dependency (cpp_reader
*pfile
)
1700 int angle_brackets
, ordering
;
1701 location_t location
;
1703 fname
= parse_include (pfile
, &angle_brackets
, NULL
, &location
);
1707 ordering
= _cpp_compare_file_date (pfile
, fname
, angle_brackets
);
1709 cpp_error (pfile
, CPP_DL_WARNING
, "cannot find source file %s", fname
);
1710 else if (ordering
> 0)
1712 cpp_error (pfile
, CPP_DL_WARNING
,
1713 "current file is older than %s", fname
);
1714 if (cpp_get_token (pfile
)->type
!= CPP_EOF
)
1716 _cpp_backup_tokens (pfile
, 1);
1717 do_diagnostic (pfile
, CPP_DL_WARNING
, CPP_W_NONE
, 0);
1721 free ((void *) fname
);
1724 /* Issue a diagnostic with the message taken from the pragma. If
1725 ERROR is true, the diagnostic is a warning, otherwise, it is an
1728 do_pragma_warning_or_error (cpp_reader
*pfile
, bool error
)
1730 const cpp_token
*tok
= _cpp_lex_token (pfile
);
1732 if (tok
->type
!= CPP_STRING
1733 || !cpp_interpret_string_notranslate (pfile
, &tok
->val
.str
, 1, &str
,
1737 cpp_error (pfile
, CPP_DL_ERROR
, "invalid \"#pragma GCC %s\" directive",
1738 error
? "error" : "warning");
1741 cpp_error (pfile
, error
? CPP_DL_ERROR
: CPP_DL_WARNING
,
1743 free ((void *)str
.text
);
1746 /* Issue a warning diagnostic. */
1748 do_pragma_warning (cpp_reader
*pfile
)
1750 do_pragma_warning_or_error (pfile
, false);
1753 /* Issue an error diagnostic. */
1755 do_pragma_error (cpp_reader
*pfile
)
1757 do_pragma_warning_or_error (pfile
, true);
1760 /* Get a token but skip padding. */
1761 static const cpp_token
*
1762 get_token_no_padding (cpp_reader
*pfile
)
1766 const cpp_token
*result
= cpp_get_token (pfile
);
1767 if (result
->type
!= CPP_PADDING
)
1772 /* Check syntax is "(string-literal)". Returns the string on success,
1773 or NULL on failure. */
1774 static const cpp_token
*
1775 get__Pragma_string (cpp_reader
*pfile
)
1777 const cpp_token
*string
;
1778 const cpp_token
*paren
;
1780 paren
= get_token_no_padding (pfile
);
1781 if (paren
->type
== CPP_EOF
)
1782 _cpp_backup_tokens (pfile
, 1);
1783 if (paren
->type
!= CPP_OPEN_PAREN
)
1786 string
= get_token_no_padding (pfile
);
1787 if (string
->type
== CPP_EOF
)
1788 _cpp_backup_tokens (pfile
, 1);
1789 if (string
->type
!= CPP_STRING
&& string
->type
!= CPP_WSTRING
1790 && string
->type
!= CPP_STRING32
&& string
->type
!= CPP_STRING16
1791 && string
->type
!= CPP_UTF8STRING
)
1794 paren
= get_token_no_padding (pfile
);
1795 if (paren
->type
== CPP_EOF
)
1796 _cpp_backup_tokens (pfile
, 1);
1797 if (paren
->type
!= CPP_CLOSE_PAREN
)
1803 /* Destringize IN into a temporary buffer, by removing the first \ of
1804 \" and \\ sequences, and process the result as a #pragma directive. */
1806 destringize_and_run (cpp_reader
*pfile
, const cpp_string
*in
,
1807 location_t expansion_loc
)
1809 const unsigned char *src
, *limit
;
1810 char *dest
, *result
;
1811 cpp_context
*saved_context
;
1812 cpp_token
*saved_cur_token
;
1813 tokenrun
*saved_cur_run
;
1816 const struct directive
*save_directive
;
1818 dest
= result
= (char *) alloca (in
->len
- 1);
1819 src
= in
->text
+ 1 + (in
->text
[0] == 'L');
1820 limit
= in
->text
+ in
->len
- 1;
1823 /* We know there is a character following the backslash. */
1824 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1830 /* Ugh; an awful kludge. We are really not set up to be lexing
1831 tokens when in the middle of a macro expansion. Use a new
1832 context to force cpp_get_token to lex, and so skip_rest_of_line
1833 doesn't go beyond the end of the text. Also, remember the
1834 current lexing position so we can return to it later.
1836 Something like line-at-a-time lexing should remove the need for
1838 saved_context
= pfile
->context
;
1839 saved_cur_token
= pfile
->cur_token
;
1840 saved_cur_run
= pfile
->cur_run
;
1842 pfile
->context
= XCNEW (cpp_context
);
1844 /* Inline run_directive, since we need to delay the _cpp_pop_buffer
1845 until we've read all of the tokens that we want. */
1846 cpp_push_buffer (pfile
, (const uchar
*) result
, dest
- result
,
1847 /* from_stage3 */ true);
1848 /* ??? Antique Disgusting Hack. What does this do? */
1849 if (pfile
->buffer
->prev
)
1850 pfile
->buffer
->file
= pfile
->buffer
->prev
->file
;
1852 start_directive (pfile
);
1853 _cpp_clean_line (pfile
);
1854 save_directive
= pfile
->directive
;
1855 pfile
->directive
= &dtable
[T_PRAGMA
];
1857 end_directive (pfile
, 1);
1858 pfile
->directive
= save_directive
;
1860 /* We always insert at least one token, the directive result. It'll
1861 either be a CPP_PADDING or a CPP_PRAGMA. In the later case, we
1862 need to insert *all* of the tokens, including the CPP_PRAGMA_EOL. */
1864 /* If we're not handling the pragma internally, read all of the tokens from
1865 the string buffer now, while the string buffer is still installed. */
1866 /* ??? Note that the token buffer allocated here is leaked. It's not clear
1867 to me what the true lifespan of the tokens are. It would appear that
1868 the lifespan is the entire parse of the main input stream, in which case
1869 this may not be wrong. */
1870 if (pfile
->directive_result
.type
== CPP_PRAGMA
)
1876 toks
= XNEWVEC (cpp_token
, maxcount
);
1877 toks
[0] = pfile
->directive_result
;
1881 if (count
== maxcount
)
1883 maxcount
= maxcount
* 3 / 2;
1884 toks
= XRESIZEVEC (cpp_token
, toks
, maxcount
);
1886 toks
[count
] = *cpp_get_token (pfile
);
1887 /* _Pragma is a builtin, so we're not within a macro-map, and so
1888 the token locations are set to bogus ordinary locations
1889 near to, but after that of the "_Pragma".
1890 Paper over this by setting them equal to the location of the
1891 _Pragma itself (PR preprocessor/69126). */
1892 toks
[count
].src_loc
= expansion_loc
;
1893 /* Macros have been already expanded by cpp_get_token
1894 if the pragma allowed expansion. */
1895 toks
[count
++].flags
|= NO_EXPAND
;
1897 while (toks
[count
-1].type
!= CPP_PRAGMA_EOL
);
1902 toks
= XNEW (cpp_token
);
1903 toks
[0] = pfile
->directive_result
;
1905 /* If we handled the entire pragma internally, make sure we get the
1906 line number correct for the next token. */
1907 if (pfile
->cb
.line_change
)
1908 pfile
->cb
.line_change (pfile
, pfile
->cur_token
, false);
1911 /* Finish inlining run_directive. */
1912 pfile
->buffer
->file
= NULL
;
1913 _cpp_pop_buffer (pfile
);
1915 /* Reset the old macro state before ... */
1916 XDELETE (pfile
->context
);
1917 pfile
->context
= saved_context
;
1918 pfile
->cur_token
= saved_cur_token
;
1919 pfile
->cur_run
= saved_cur_run
;
1921 /* ... inserting the new tokens we collected. */
1922 _cpp_push_token_context (pfile
, NULL
, toks
, count
);
1925 /* Handle the _Pragma operator. Return 0 on error, 1 if ok. */
1927 _cpp_do__Pragma (cpp_reader
*pfile
, location_t expansion_loc
)
1929 const cpp_token
*string
= get__Pragma_string (pfile
);
1930 pfile
->directive_result
.type
= CPP_PADDING
;
1934 destringize_and_run (pfile
, &string
->val
.str
, expansion_loc
);
1937 cpp_error (pfile
, CPP_DL_ERROR
,
1938 "_Pragma takes a parenthesized string literal");
1942 /* Handle #ifdef. */
1944 do_ifdef (cpp_reader
*pfile
)
1948 if (! pfile
->state
.skipping
)
1950 cpp_hashnode
*node
= lex_macro_node (pfile
, false);
1954 /* Do not treat conditional macros as being defined. This is due to
1955 the powerpc port using conditional macros for 'vector', 'bool',
1956 and 'pixel' to act as conditional keywords. This messes up tests
1957 like #ifndef bool. */
1958 skip
= !cpp_macro_p (node
) || (node
->flags
& NODE_CONDITIONAL
);
1959 _cpp_mark_macro_used (node
);
1960 _cpp_maybe_notify_macro_use (pfile
, node
);
1962 pfile
->cb
.used (pfile
, pfile
->directive_line
, node
);
1963 check_eol (pfile
, false);
1967 push_conditional (pfile
, skip
, T_IFDEF
, 0);
1970 /* Handle #ifndef. */
1972 do_ifndef (cpp_reader
*pfile
)
1975 cpp_hashnode
*node
= 0;
1977 if (! pfile
->state
.skipping
)
1979 node
= lex_macro_node (pfile
, false);
1983 /* Do not treat conditional macros as being defined. This is due to
1984 the powerpc port using conditional macros for 'vector', 'bool',
1985 and 'pixel' to act as conditional keywords. This messes up tests
1986 like #ifndef bool. */
1987 skip
= (cpp_macro_p (node
)
1988 && !(node
->flags
& NODE_CONDITIONAL
));
1989 _cpp_mark_macro_used (node
);
1990 _cpp_maybe_notify_macro_use (pfile
, node
);
1992 pfile
->cb
.used (pfile
, pfile
->directive_line
, node
);
1993 check_eol (pfile
, false);
1997 push_conditional (pfile
, skip
, T_IFNDEF
, node
);
2000 /* _cpp_parse_expr puts a macro in a "#if !defined ()" expression in
2001 pfile->mi_ind_cmacro so we can handle multiple-include
2002 optimizations. If macro expansion occurs in the expression, we
2003 cannot treat it as a controlling conditional, since the expansion
2004 could change in the future. That is handled by cpp_get_token. */
2006 do_if (cpp_reader
*pfile
)
2010 if (! pfile
->state
.skipping
)
2011 skip
= _cpp_parse_expr (pfile
, true) == false;
2013 push_conditional (pfile
, skip
, T_IF
, pfile
->mi_ind_cmacro
);
2016 /* Flip skipping state if appropriate and continue without changing
2017 if_stack; this is so that the error message for missing #endif's
2018 etc. will point to the original #if. */
2020 do_else (cpp_reader
*pfile
)
2022 cpp_buffer
*buffer
= pfile
->buffer
;
2023 struct if_stack
*ifs
= buffer
->if_stack
;
2026 cpp_error (pfile
, CPP_DL_ERROR
, "#else without #if");
2029 if (ifs
->type
== T_ELSE
)
2031 cpp_error (pfile
, CPP_DL_ERROR
, "#else after #else");
2032 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2033 "the conditional began here");
2037 /* Skip any future (erroneous) #elses or #elifs. */
2038 pfile
->state
.skipping
= ifs
->skip_elses
;
2039 ifs
->skip_elses
= true;
2041 /* Invalidate any controlling macro. */
2044 /* Only check EOL if was not originally skipping. */
2045 if (!ifs
->was_skipping
&& CPP_OPTION (pfile
, warn_endif_labels
))
2046 check_eol_endif_labels (pfile
);
2050 /* Handle a #elif directive by not changing if_stack either. See the
2051 comment above do_else. */
2053 do_elif (cpp_reader
*pfile
)
2055 cpp_buffer
*buffer
= pfile
->buffer
;
2056 struct if_stack
*ifs
= buffer
->if_stack
;
2059 cpp_error (pfile
, CPP_DL_ERROR
, "#elif without #if");
2062 if (ifs
->type
== T_ELSE
)
2064 cpp_error (pfile
, CPP_DL_ERROR
, "#elif after #else");
2065 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2066 "the conditional began here");
2070 /* See DR#412: "Only the first group whose control condition
2071 evaluates to true (nonzero) is processed; any following groups
2072 are skipped and their controlling directives are processed as
2073 if they were in a group that is skipped." */
2074 if (ifs
->skip_elses
)
2075 pfile
->state
.skipping
= 1;
2078 pfile
->state
.skipping
= ! _cpp_parse_expr (pfile
, false);
2079 ifs
->skip_elses
= ! pfile
->state
.skipping
;
2082 /* Invalidate any controlling macro. */
2087 /* #endif pops the if stack and resets pfile->state.skipping. */
2089 do_endif (cpp_reader
*pfile
)
2091 cpp_buffer
*buffer
= pfile
->buffer
;
2092 struct if_stack
*ifs
= buffer
->if_stack
;
2095 cpp_error (pfile
, CPP_DL_ERROR
, "#endif without #if");
2098 /* Only check EOL if was not originally skipping. */
2099 if (!ifs
->was_skipping
&& CPP_OPTION (pfile
, warn_endif_labels
))
2100 check_eol_endif_labels (pfile
);
2102 /* If potential control macro, we go back outside again. */
2103 if (ifs
->next
== 0 && ifs
->mi_cmacro
)
2105 pfile
->mi_valid
= true;
2106 pfile
->mi_cmacro
= ifs
->mi_cmacro
;
2109 buffer
->if_stack
= ifs
->next
;
2110 pfile
->state
.skipping
= ifs
->was_skipping
;
2111 obstack_free (&pfile
->buffer_ob
, ifs
);
2115 /* Push an if_stack entry for a preprocessor conditional, and set
2116 pfile->state.skipping to SKIP. If TYPE indicates the conditional
2117 is #if or #ifndef, CMACRO is a potentially controlling macro, and
2118 we need to check here that we are at the top of the file. */
2120 push_conditional (cpp_reader
*pfile
, int skip
, int type
,
2121 const cpp_hashnode
*cmacro
)
2123 struct if_stack
*ifs
;
2124 cpp_buffer
*buffer
= pfile
->buffer
;
2126 ifs
= XOBNEW (&pfile
->buffer_ob
, struct if_stack
);
2127 ifs
->line
= pfile
->directive_line
;
2128 ifs
->next
= buffer
->if_stack
;
2129 ifs
->skip_elses
= pfile
->state
.skipping
|| !skip
;
2130 ifs
->was_skipping
= pfile
->state
.skipping
;
2132 /* This condition is effectively a test for top-of-file. */
2133 if (pfile
->mi_valid
&& pfile
->mi_cmacro
== 0)
2134 ifs
->mi_cmacro
= cmacro
;
2138 pfile
->state
.skipping
= skip
;
2139 buffer
->if_stack
= ifs
;
2142 /* Read the tokens of the answer into the macro pool, in a directive
2143 of type TYPE. Only commit the memory if we intend it as permanent
2144 storage, i.e. the #assert case. Returns 0 on success, and sets
2145 ANSWERP to point to the answer. PRED_LOC is the location of the
2148 parse_answer (cpp_reader
*pfile
, int type
, location_t pred_loc
,
2149 cpp_macro
**answer_ptr
)
2151 /* In a conditional, it is legal to not have an open paren. We
2152 should save the following token in this case. */
2153 const cpp_token
*paren
= cpp_get_token (pfile
);
2155 /* If not a paren, see if we're OK. */
2156 if (paren
->type
!= CPP_OPEN_PAREN
)
2158 /* In a conditional no answer is a test for any answer. It
2159 could be followed by any token. */
2162 _cpp_backup_tokens (pfile
, 1);
2166 /* #unassert with no answer is valid - it removes all answers. */
2167 if (type
== T_UNASSERT
&& paren
->type
== CPP_EOF
)
2170 cpp_error_with_line (pfile
, CPP_DL_ERROR
, pred_loc
, 0,
2171 "missing '(' after predicate");
2175 cpp_macro
*answer
= _cpp_new_macro (pfile
, cmk_assert
,
2176 _cpp_reserve_room (pfile
, 0,
2177 sizeof (cpp_macro
)));
2178 answer
->parm
.next
= NULL
;
2182 const cpp_token
*token
= cpp_get_token (pfile
);
2184 if (token
->type
== CPP_CLOSE_PAREN
)
2187 if (token
->type
== CPP_EOF
)
2189 cpp_error (pfile
, CPP_DL_ERROR
, "missing ')' to complete answer");
2193 answer
= (cpp_macro
*)_cpp_reserve_room
2194 (pfile
, sizeof (cpp_macro
) + count
* sizeof (cpp_token
),
2195 sizeof (cpp_token
));
2196 answer
->exp
.tokens
[count
++] = *token
;
2201 cpp_error (pfile
, CPP_DL_ERROR
, "predicate's answer is empty");
2205 /* Drop whitespace at start, for answer equivalence purposes. */
2206 answer
->exp
.tokens
[0].flags
&= ~PREV_WHITE
;
2208 answer
->count
= count
;
2209 *answer_ptr
= answer
;
2214 /* Parses an assertion directive of type TYPE, returning a pointer to
2215 the hash node of the predicate, or 0 on error. The node is
2216 guaranteed to be disjoint from the macro namespace, so can only
2217 have type 'NT_VOID'. If an answer was supplied, it is placed in
2218 *ANSWER_PTR, which is otherwise set to 0. */
2219 static cpp_hashnode
*
2220 parse_assertion (cpp_reader
*pfile
, int type
, cpp_macro
**answer_ptr
)
2222 cpp_hashnode
*result
= 0;
2224 /* We don't expand predicates or answers. */
2225 pfile
->state
.prevent_expansion
++;
2229 const cpp_token
*predicate
= cpp_get_token (pfile
);
2230 if (predicate
->type
== CPP_EOF
)
2231 cpp_error (pfile
, CPP_DL_ERROR
, "assertion without predicate");
2232 else if (predicate
->type
!= CPP_NAME
)
2233 cpp_error_with_line (pfile
, CPP_DL_ERROR
, predicate
->src_loc
, 0,
2234 "predicate must be an identifier");
2235 else if (parse_answer (pfile
, type
, predicate
->src_loc
, answer_ptr
))
2237 unsigned int len
= NODE_LEN (predicate
->val
.node
.node
);
2238 unsigned char *sym
= (unsigned char *) alloca (len
+ 1);
2240 /* Prefix '#' to get it out of macro namespace. */
2242 memcpy (sym
+ 1, NODE_NAME (predicate
->val
.node
.node
), len
);
2243 result
= cpp_lookup (pfile
, sym
, len
+ 1);
2246 pfile
->state
.prevent_expansion
--;
2251 /* Returns a pointer to the pointer to CANDIDATE in the answer chain,
2252 or a pointer to NULL if the answer is not in the chain. */
2254 find_answer (cpp_hashnode
*node
, const cpp_macro
*candidate
)
2257 cpp_macro
**result
= NULL
;
2259 for (result
= &node
->value
.answers
; *result
; result
= &(*result
)->parm
.next
)
2261 cpp_macro
*answer
= *result
;
2263 if (answer
->count
== candidate
->count
)
2265 for (i
= 0; i
< answer
->count
; i
++)
2266 if (!_cpp_equiv_tokens (&answer
->exp
.tokens
[i
],
2267 &candidate
->exp
.tokens
[i
]))
2270 if (i
== answer
->count
)
2278 /* Test an assertion within a preprocessor conditional. Returns
2279 nonzero on failure, zero on success. On success, the result of
2280 the test is written into VALUE, otherwise the value 0. */
2282 _cpp_test_assertion (cpp_reader
*pfile
, unsigned int *value
)
2285 cpp_hashnode
*node
= parse_assertion (pfile
, T_IF
, &answer
);
2287 /* For recovery, an erroneous assertion expression is handled as a
2288 failing assertion. */
2293 if (node
->value
.answers
)
2294 *value
= !answer
|| *find_answer (node
, answer
);
2296 else if (pfile
->cur_token
[-1].type
== CPP_EOF
)
2297 _cpp_backup_tokens (pfile
, 1);
2299 /* We don't commit the memory for the answer - it's temporary only. */
2303 /* Handle #assert. */
2305 do_assert (cpp_reader
*pfile
)
2308 cpp_hashnode
*node
= parse_assertion (pfile
, T_ASSERT
, &answer
);
2312 /* Place the new answer in the answer list. First check there
2313 is not a duplicate. */
2314 if (*find_answer (node
, answer
))
2316 cpp_error (pfile
, CPP_DL_WARNING
, "\"%s\" re-asserted",
2317 NODE_NAME (node
) + 1);
2321 /* Commit or allocate storage for the answer. */
2322 answer
= (cpp_macro
*)_cpp_commit_buff
2323 (pfile
, sizeof (cpp_macro
) - sizeof (cpp_token
)
2324 + sizeof (cpp_token
) * answer
->count
);
2326 /* Chain into the list. */
2327 answer
->parm
.next
= node
->value
.answers
;
2328 node
->value
.answers
= answer
;
2330 check_eol (pfile
, false);
2334 /* Handle #unassert. */
2336 do_unassert (cpp_reader
*pfile
)
2339 cpp_hashnode
*node
= parse_assertion (pfile
, T_UNASSERT
, &answer
);
2341 /* It isn't an error to #unassert something that isn't asserted. */
2346 cpp_macro
**p
= find_answer (node
, answer
);
2348 /* Remove the assert from the list. */
2349 if (cpp_macro
*temp
= *p
)
2350 *p
= temp
->parm
.next
;
2352 check_eol (pfile
, false);
2355 _cpp_free_definition (node
);
2358 /* We don't commit the memory for the answer - it's temporary only. */
2361 /* These are for -D, -U, -A. */
2363 /* Process the string STR as if it appeared as the body of a #define.
2364 If STR is just an identifier, define it with value 1.
2365 If STR has anything after the identifier, then it should
2366 be identifier=definition. */
2368 cpp_define (cpp_reader
*pfile
, const char *str
)
2374 /* Copy the entire option so we can modify it.
2375 Change the first "=" in the string to a space. If there is none,
2376 tack " 1" on the end. */
2378 count
= strlen (str
);
2379 buf
= (char *) alloca (count
+ 3);
2380 memcpy (buf
, str
, count
);
2382 p
= strchr (str
, '=');
2392 run_directive (pfile
, T_DEFINE
, buf
, count
);
2396 /* Use to build macros to be run through cpp_define() as
2398 Example: cpp_define_formatted (pfile, "MACRO=%d", value); */
2401 cpp_define_formatted (cpp_reader
*pfile
, const char *fmt
, ...)
2407 ptr
= xvasprintf (fmt
, ap
);
2410 cpp_define (pfile
, ptr
);
2415 /* Slight variant of the above for use by initialize_builtins. */
2417 _cpp_define_builtin (cpp_reader
*pfile
, const char *str
)
2419 size_t len
= strlen (str
);
2420 char *buf
= (char *) alloca (len
+ 1);
2421 memcpy (buf
, str
, len
);
2423 run_directive (pfile
, T_DEFINE
, buf
, len
);
2426 /* Process MACRO as if it appeared as the body of an #undef. */
2428 cpp_undef (cpp_reader
*pfile
, const char *macro
)
2430 size_t len
= strlen (macro
);
2431 char *buf
= (char *) alloca (len
+ 1);
2432 memcpy (buf
, macro
, len
);
2434 run_directive (pfile
, T_UNDEF
, buf
, len
);
2437 /* Replace a previous definition DEF of the macro STR. If DEF is NULL,
2438 or first element is zero, then the macro should be undefined. */
2440 cpp_pop_definition (cpp_reader
*pfile
, struct def_pragma_macro
*c
)
2442 cpp_hashnode
*node
= _cpp_lex_identifier (pfile
, c
->name
);
2446 if (pfile
->cb
.before_define
)
2447 pfile
->cb
.before_define (pfile
);
2449 if (cpp_macro_p (node
))
2451 if (pfile
->cb
.undef
)
2452 pfile
->cb
.undef (pfile
, pfile
->directive_line
, node
);
2453 if (CPP_OPTION (pfile
, warn_unused_macros
))
2454 _cpp_warn_if_unused_macro (pfile
, node
, NULL
);
2455 _cpp_free_definition (node
);
2464 cpp_hashnode
*h
= NULL
;
2467 namelen
= ustrcspn (c
->definition
, "( \n");
2468 h
= cpp_lookup (pfile
, c
->definition
, namelen
);
2469 dn
= c
->definition
+ namelen
;
2471 nbuf
= cpp_push_buffer (pfile
, dn
, ustrchr (dn
, '\n') - dn
, true);
2474 _cpp_clean_line (pfile
);
2476 if (!_cpp_create_definition (pfile
, h
))
2478 _cpp_pop_buffer (pfile
);
2482 h
->value
.macro
->line
= c
->line
;
2483 h
->value
.macro
->syshdr
= c
->syshdr
;
2484 h
->value
.macro
->used
= c
->used
;
2488 /* Process the string STR as if it appeared as the body of a #assert. */
2490 cpp_assert (cpp_reader
*pfile
, const char *str
)
2492 handle_assertion (pfile
, str
, T_ASSERT
);
2495 /* Process STR as if it appeared as the body of an #unassert. */
2497 cpp_unassert (cpp_reader
*pfile
, const char *str
)
2499 handle_assertion (pfile
, str
, T_UNASSERT
);
2502 /* Common code for cpp_assert (-A) and cpp_unassert (-A-). */
2504 handle_assertion (cpp_reader
*pfile
, const char *str
, int type
)
2506 size_t count
= strlen (str
);
2507 const char *p
= strchr (str
, '=');
2509 /* Copy the entire option so we can modify it. Change the first
2510 "=" in the string to a '(', and tack a ')' on the end. */
2511 char *buf
= (char *) alloca (count
+ 2);
2513 memcpy (buf
, str
, count
);
2522 run_directive (pfile
, type
, str
, count
);
2525 /* The options structure. */
2527 cpp_get_options (cpp_reader
*pfile
)
2529 return &pfile
->opts
;
2532 /* The callbacks structure. */
2534 cpp_get_callbacks (cpp_reader
*pfile
)
2539 /* Copy the given callbacks structure to our own. */
2541 cpp_set_callbacks (cpp_reader
*pfile
, cpp_callbacks
*cb
)
2546 /* The dependencies structure. (Creates one if it hasn't already been.) */
2548 cpp_get_deps (cpp_reader
*pfile
)
2551 pfile
->deps
= deps_init ();
2555 /* Push a new buffer on the buffer stack. Returns the new buffer; it
2556 doesn't fail. It does not generate a file change call back; that
2557 is the responsibility of the caller. */
2559 cpp_push_buffer (cpp_reader
*pfile
, const uchar
*buffer
, size_t len
,
2562 cpp_buffer
*new_buffer
= XOBNEW (&pfile
->buffer_ob
, cpp_buffer
);
2564 /* Clears, amongst other things, if_stack and mi_cmacro. */
2565 memset (new_buffer
, 0, sizeof (cpp_buffer
));
2567 new_buffer
->next_line
= new_buffer
->buf
= buffer
;
2568 new_buffer
->rlimit
= buffer
+ len
;
2569 new_buffer
->from_stage3
= from_stage3
;
2570 new_buffer
->prev
= pfile
->buffer
;
2571 new_buffer
->need_line
= true;
2573 pfile
->buffer
= new_buffer
;
2578 /* Pops a single buffer, with a file change call-back if appropriate.
2579 Then pushes the next -include file, if any remain. */
2581 _cpp_pop_buffer (cpp_reader
*pfile
)
2583 cpp_buffer
*buffer
= pfile
->buffer
;
2584 struct _cpp_file
*inc
= buffer
->file
;
2585 struct if_stack
*ifs
;
2586 const unsigned char *to_free
;
2588 /* Walk back up the conditional stack till we reach its level at
2589 entry to this file, issuing error messages. */
2590 for (ifs
= buffer
->if_stack
; ifs
; ifs
= ifs
->next
)
2591 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2592 "unterminated #%s", dtable
[ifs
->type
].name
);
2594 /* In case of a missing #endif. */
2595 pfile
->state
.skipping
= 0;
2597 /* _cpp_do_file_change expects pfile->buffer to be the new one. */
2598 pfile
->buffer
= buffer
->prev
;
2600 to_free
= buffer
->to_free
;
2601 free (buffer
->notes
);
2603 /* Free the buffer object now; we may want to push a new buffer
2604 in _cpp_push_next_include_file. */
2605 obstack_free (&pfile
->buffer_ob
, buffer
);
2609 _cpp_pop_file_buffer (pfile
, inc
, to_free
);
2611 _cpp_do_file_change (pfile
, LC_LEAVE
, 0, 0, 0);
2614 free ((void *)to_free
);
2617 /* Enter all recognized directives in the hash table. */
2619 _cpp_init_directives (cpp_reader
*pfile
)
2624 for (i
= 0; i
< (unsigned int) N_DIRECTIVES
; i
++)
2626 node
= cpp_lookup (pfile
, dtable
[i
].name
, dtable
[i
].length
);
2627 node
->is_directive
= 1;
2628 node
->directive_index
= i
;
2632 /* Extract header file from a bracket include. Parsing starts after '<'.
2633 The string is malloced and must be freed by the caller. */
2635 _cpp_bracket_include(cpp_reader
*pfile
)
2637 return glue_header_name (pfile
);