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), unlike in #line. */
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. pfile->line has changed to
1119 FILE_LINE of TO_FILE, for reason REASON. SYSP is 1 for a system
1120 header, 2 for a system header that needs to be extern "C" protected,
1121 and zero otherwise. */
1123 _cpp_do_file_change (cpp_reader
*pfile
, enum lc_reason reason
,
1124 const char *to_file
, linenum_type file_line
,
1127 linemap_assert (reason
!= LC_ENTER_MACRO
);
1128 const struct line_map
*map
= linemap_add (pfile
->line_table
, reason
, sysp
,
1129 to_file
, file_line
);
1130 const line_map_ordinary
*ord_map
= NULL
;
1133 ord_map
= linemap_check_ordinary (map
);
1134 linemap_line_start (pfile
->line_table
,
1135 ORDINARY_MAP_STARTING_LINE_NUMBER (ord_map
),
1139 if (pfile
->cb
.file_change
)
1140 pfile
->cb
.file_change (pfile
, ord_map
);
1143 /* Report a warning or error detected by the program we are
1144 processing. Use the directive's tokens in the error message. */
1146 do_diagnostic (cpp_reader
*pfile
, enum cpp_diagnostic_level code
,
1147 enum cpp_warning_reason reason
, int print_dir
)
1149 const unsigned char *dir_name
;
1150 unsigned char *line
;
1151 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1154 dir_name
= pfile
->directive
->name
;
1157 pfile
->state
.prevent_expansion
++;
1158 line
= cpp_output_line_to_string (pfile
, dir_name
);
1159 pfile
->state
.prevent_expansion
--;
1161 if (code
== CPP_DL_WARNING_SYSHDR
&& reason
)
1162 cpp_warning_with_line_syshdr (pfile
, reason
, src_loc
, 0, "%s", line
);
1163 else if (code
== CPP_DL_WARNING
&& reason
)
1164 cpp_warning_with_line (pfile
, reason
, src_loc
, 0, "%s", line
);
1166 cpp_error_with_line (pfile
, code
, src_loc
, 0, "%s", line
);
1171 do_error (cpp_reader
*pfile
)
1173 do_diagnostic (pfile
, CPP_DL_ERROR
, CPP_W_NONE
, 1);
1177 do_warning (cpp_reader
*pfile
)
1179 /* We want #warning diagnostics to be emitted in system headers too. */
1180 do_diagnostic (pfile
, CPP_DL_WARNING_SYSHDR
, CPP_W_WARNING_DIRECTIVE
, 1);
1183 /* Report program identification. */
1185 do_ident (cpp_reader
*pfile
)
1187 const cpp_token
*str
= cpp_get_token (pfile
);
1189 if (str
->type
!= CPP_STRING
)
1190 cpp_error (pfile
, CPP_DL_ERROR
, "invalid #%s directive",
1191 pfile
->directive
->name
);
1192 else if (pfile
->cb
.ident
)
1193 pfile
->cb
.ident (pfile
, pfile
->directive_line
, &str
->val
.str
);
1195 check_eol (pfile
, false);
1198 /* Lookup a PRAGMA name in a singly-linked CHAIN. Returns the
1199 matching entry, or NULL if none is found. The returned entry could
1200 be the start of a namespace chain, or a pragma. */
1201 static struct pragma_entry
*
1202 lookup_pragma_entry (struct pragma_entry
*chain
, const cpp_hashnode
*pragma
)
1204 while (chain
&& chain
->pragma
!= pragma
)
1205 chain
= chain
->next
;
1210 /* Create and insert a blank pragma entry at the beginning of a
1211 singly-linked CHAIN. */
1212 static struct pragma_entry
*
1213 new_pragma_entry (cpp_reader
*pfile
, struct pragma_entry
**chain
)
1215 struct pragma_entry
*new_entry
;
1217 new_entry
= (struct pragma_entry
*)
1218 _cpp_aligned_alloc (pfile
, sizeof (struct pragma_entry
));
1220 memset (new_entry
, 0, sizeof (struct pragma_entry
));
1221 new_entry
->next
= *chain
;
1227 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1228 goes in the global namespace. */
1229 static struct pragma_entry
*
1230 register_pragma_1 (cpp_reader
*pfile
, const char *space
, const char *name
,
1231 bool allow_name_expansion
)
1233 struct pragma_entry
**chain
= &pfile
->pragmas
;
1234 struct pragma_entry
*entry
;
1235 const cpp_hashnode
*node
;
1239 node
= cpp_lookup (pfile
, UC space
, strlen (space
));
1240 entry
= lookup_pragma_entry (*chain
, node
);
1243 entry
= new_pragma_entry (pfile
, chain
);
1244 entry
->pragma
= node
;
1245 entry
->is_nspace
= true;
1246 entry
->allow_expansion
= allow_name_expansion
;
1248 else if (!entry
->is_nspace
)
1250 else if (entry
->allow_expansion
!= allow_name_expansion
)
1252 cpp_error (pfile
, CPP_DL_ICE
,
1253 "registering pragmas in namespace \"%s\" with mismatched "
1254 "name expansion", space
);
1257 chain
= &entry
->u
.space
;
1259 else if (allow_name_expansion
)
1261 cpp_error (pfile
, CPP_DL_ICE
,
1262 "registering pragma \"%s\" with name expansion "
1263 "and no namespace", name
);
1267 /* Check for duplicates. */
1268 node
= cpp_lookup (pfile
, UC name
, strlen (name
));
1269 entry
= lookup_pragma_entry (*chain
, node
);
1272 entry
= new_pragma_entry (pfile
, chain
);
1273 entry
->pragma
= node
;
1277 if (entry
->is_nspace
)
1279 cpp_error (pfile
, CPP_DL_ICE
,
1280 "registering \"%s\" as both a pragma and a pragma namespace",
1283 cpp_error (pfile
, CPP_DL_ICE
, "#pragma %s %s is already registered",
1286 cpp_error (pfile
, CPP_DL_ICE
, "#pragma %s is already registered", name
);
1291 /* Register a cpplib internal pragma SPACE NAME with HANDLER. */
1293 register_pragma_internal (cpp_reader
*pfile
, const char *space
,
1294 const char *name
, pragma_cb handler
)
1296 struct pragma_entry
*entry
;
1298 entry
= register_pragma_1 (pfile
, space
, name
, false);
1299 entry
->is_internal
= true;
1300 entry
->u
.handler
= handler
;
1303 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1304 goes in the global namespace. HANDLER is the handler it will call,
1305 which must be non-NULL. If ALLOW_EXPANSION is set, allow macro
1306 expansion while parsing pragma NAME. This function is exported
1309 cpp_register_pragma (cpp_reader
*pfile
, const char *space
, const char *name
,
1310 pragma_cb handler
, bool allow_expansion
)
1312 struct pragma_entry
*entry
;
1316 cpp_error (pfile
, CPP_DL_ICE
, "registering pragma with NULL handler");
1320 entry
= register_pragma_1 (pfile
, space
, name
, false);
1323 entry
->allow_expansion
= allow_expansion
;
1324 entry
->u
.handler
= handler
;
1328 /* Similarly, but create mark the pragma for deferred processing.
1329 When found, a CPP_PRAGMA token will be insertted into the stream
1330 with IDENT in the token->u.pragma slot. */
1332 cpp_register_deferred_pragma (cpp_reader
*pfile
, const char *space
,
1333 const char *name
, unsigned int ident
,
1334 bool allow_expansion
, bool allow_name_expansion
)
1336 struct pragma_entry
*entry
;
1338 entry
= register_pragma_1 (pfile
, space
, name
, allow_name_expansion
);
1341 entry
->is_deferred
= true;
1342 entry
->allow_expansion
= allow_expansion
;
1343 entry
->u
.ident
= ident
;
1347 /* Register the pragmas the preprocessor itself handles. */
1349 _cpp_init_internal_pragmas (cpp_reader
*pfile
)
1351 /* Pragmas in the global namespace. */
1352 register_pragma_internal (pfile
, 0, "once", do_pragma_once
);
1353 register_pragma_internal (pfile
, 0, "push_macro", do_pragma_push_macro
);
1354 register_pragma_internal (pfile
, 0, "pop_macro", do_pragma_pop_macro
);
1356 /* New GCC-specific pragmas should be put in the GCC namespace. */
1357 register_pragma_internal (pfile
, "GCC", "poison", do_pragma_poison
);
1358 register_pragma_internal (pfile
, "GCC", "system_header",
1359 do_pragma_system_header
);
1360 register_pragma_internal (pfile
, "GCC", "dependency", do_pragma_dependency
);
1361 register_pragma_internal (pfile
, "GCC", "warning", do_pragma_warning
);
1362 register_pragma_internal (pfile
, "GCC", "error", do_pragma_error
);
1365 /* Return the number of registered pragmas in PE. */
1368 count_registered_pragmas (struct pragma_entry
*pe
)
1371 for (; pe
!= NULL
; pe
= pe
->next
)
1374 ct
+= count_registered_pragmas (pe
->u
.space
);
1380 /* Save into SD the names of the registered pragmas referenced by PE,
1381 and return a pointer to the next free space in SD. */
1384 save_registered_pragmas (struct pragma_entry
*pe
, char **sd
)
1386 for (; pe
!= NULL
; pe
= pe
->next
)
1389 sd
= save_registered_pragmas (pe
->u
.space
, sd
);
1390 *sd
++ = (char *) xmemdup (HT_STR (&pe
->pragma
->ident
),
1391 HT_LEN (&pe
->pragma
->ident
),
1392 HT_LEN (&pe
->pragma
->ident
) + 1);
1397 /* Return a newly-allocated array which saves the names of the
1398 registered pragmas. */
1401 _cpp_save_pragma_names (cpp_reader
*pfile
)
1403 int ct
= count_registered_pragmas (pfile
->pragmas
);
1404 char **result
= XNEWVEC (char *, ct
);
1405 (void) save_registered_pragmas (pfile
->pragmas
, result
);
1409 /* Restore from SD the names of the registered pragmas referenced by PE,
1410 and return a pointer to the next unused name in SD. */
1413 restore_registered_pragmas (cpp_reader
*pfile
, struct pragma_entry
*pe
,
1416 for (; pe
!= NULL
; pe
= pe
->next
)
1419 sd
= restore_registered_pragmas (pfile
, pe
->u
.space
, sd
);
1420 pe
->pragma
= cpp_lookup (pfile
, UC
*sd
, strlen (*sd
));
1427 /* Restore the names of the registered pragmas from SAVED. */
1430 _cpp_restore_pragma_names (cpp_reader
*pfile
, char **saved
)
1432 (void) restore_registered_pragmas (pfile
, pfile
->pragmas
, saved
);
1436 /* Pragmata handling. We handle some, and pass the rest on to the
1437 front end. C99 defines three pragmas and says that no macro
1438 expansion is to be performed on them; whether or not macro
1439 expansion happens for other pragmas is implementation defined.
1440 This implementation allows for a mix of both, since GCC did not
1441 traditionally macro expand its (few) pragmas, whereas OpenMP
1442 specifies that macro expansion should happen. */
1444 do_pragma (cpp_reader
*pfile
)
1446 const struct pragma_entry
*p
= NULL
;
1447 const cpp_token
*token
, *pragma_token
;
1448 location_t pragma_token_virt_loc
= 0;
1450 unsigned int count
= 1;
1452 pfile
->state
.prevent_expansion
++;
1454 pragma_token
= token
= cpp_get_token_with_location (pfile
,
1455 &pragma_token_virt_loc
);
1457 if (token
->type
== CPP_NAME
)
1459 p
= lookup_pragma_entry (pfile
->pragmas
, token
->val
.node
.node
);
1460 if (p
&& p
->is_nspace
)
1462 bool allow_name_expansion
= p
->allow_expansion
;
1463 if (allow_name_expansion
)
1464 pfile
->state
.prevent_expansion
--;
1466 token
= cpp_get_token (pfile
);
1467 if (token
->type
== CPP_NAME
)
1468 p
= lookup_pragma_entry (p
->u
.space
, token
->val
.node
.node
);
1471 if (allow_name_expansion
)
1472 pfile
->state
.prevent_expansion
++;
1481 pfile
->directive_result
.src_loc
= pragma_token_virt_loc
;
1482 pfile
->directive_result
.type
= CPP_PRAGMA
;
1483 pfile
->directive_result
.flags
= pragma_token
->flags
;
1484 pfile
->directive_result
.val
.pragma
= p
->u
.ident
;
1485 pfile
->state
.in_deferred_pragma
= true;
1486 pfile
->state
.pragma_allow_expansion
= p
->allow_expansion
;
1487 if (!p
->allow_expansion
)
1488 pfile
->state
.prevent_expansion
++;
1492 /* Since the handler below doesn't get the line number, that
1493 it might need for diagnostics, make sure it has the right
1494 numbers in place. */
1495 if (pfile
->cb
.line_change
)
1496 (*pfile
->cb
.line_change
) (pfile
, pragma_token
, false);
1497 if (p
->allow_expansion
)
1498 pfile
->state
.prevent_expansion
--;
1499 (*p
->u
.handler
) (pfile
);
1500 if (p
->allow_expansion
)
1501 pfile
->state
.prevent_expansion
++;
1504 else if (pfile
->cb
.def_pragma
)
1506 if (count
== 1 || pfile
->context
->prev
== NULL
)
1507 _cpp_backup_tokens (pfile
, count
);
1510 /* Invalid name comes from macro expansion, _cpp_backup_tokens
1511 won't allow backing 2 tokens. */
1512 /* ??? The token buffer is leaked. Perhaps if def_pragma hook
1513 reads both tokens, we could perhaps free it, but if it doesn't,
1514 we don't know the exact lifespan. */
1515 cpp_token
*toks
= XNEWVEC (cpp_token
, 2);
1517 toks
[0].flags
|= NO_EXPAND
;
1519 toks
[1].flags
|= NO_EXPAND
;
1520 _cpp_push_token_context (pfile
, NULL
, toks
, 2);
1522 pfile
->cb
.def_pragma (pfile
, pfile
->directive_line
);
1525 pfile
->state
.prevent_expansion
--;
1528 /* Handle #pragma once. */
1530 do_pragma_once (cpp_reader
*pfile
)
1532 if (cpp_in_primary_file (pfile
))
1533 cpp_error (pfile
, CPP_DL_WARNING
, "#pragma once in main file");
1535 check_eol (pfile
, false);
1536 _cpp_mark_file_once_only (pfile
, pfile
->buffer
->file
);
1539 /* Handle #pragma push_macro(STRING). */
1541 do_pragma_push_macro (cpp_reader
*pfile
)
1545 const uchar
*defn
= NULL
;
1546 char *macroname
, *dest
;
1547 const char *limit
, *src
;
1548 const cpp_token
*txt
;
1549 struct def_pragma_macro
*c
;
1551 txt
= get__Pragma_string (pfile
);
1554 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1555 cpp_error_with_line (pfile
, CPP_DL_ERROR
, src_loc
, 0,
1556 "invalid #pragma push_macro directive");
1557 check_eol (pfile
, false);
1558 skip_rest_of_line (pfile
);
1561 dest
= macroname
= (char *) alloca (txt
->val
.str
.len
+ 2);
1562 src
= (const char *) (txt
->val
.str
.text
+ 1 + (txt
->val
.str
.text
[0] == 'L'));
1563 limit
= (const char *) (txt
->val
.str
.text
+ txt
->val
.str
.len
- 1);
1566 /* We know there is a character following the backslash. */
1567 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1572 check_eol (pfile
, false);
1573 skip_rest_of_line (pfile
);
1574 c
= XNEW (struct def_pragma_macro
);
1575 memset (c
, 0, sizeof (struct def_pragma_macro
));
1576 c
->name
= XNEWVAR (char, strlen (macroname
) + 1);
1577 strcpy (c
->name
, macroname
);
1578 c
->next
= pfile
->pushed_macros
;
1579 node
= _cpp_lex_identifier (pfile
, c
->name
);
1580 if (node
->type
== NT_VOID
)
1582 else if (node
->type
== NT_BUILTIN_MACRO
)
1586 defn
= cpp_macro_definition (pfile
, node
);
1587 defnlen
= ustrlen (defn
);
1588 c
->definition
= XNEWVEC (uchar
, defnlen
+ 2);
1589 c
->definition
[defnlen
] = '\n';
1590 c
->definition
[defnlen
+ 1] = 0;
1591 c
->line
= node
->value
.macro
->line
;
1592 c
->syshdr
= node
->value
.macro
->syshdr
;
1593 c
->used
= node
->value
.macro
->used
;
1594 memcpy (c
->definition
, defn
, defnlen
);
1597 pfile
->pushed_macros
= c
;
1600 /* Handle #pragma pop_macro(STRING). */
1602 do_pragma_pop_macro (cpp_reader
*pfile
)
1604 char *macroname
, *dest
;
1605 const char *limit
, *src
;
1606 const cpp_token
*txt
;
1607 struct def_pragma_macro
*l
= NULL
, *c
= pfile
->pushed_macros
;
1608 txt
= get__Pragma_string (pfile
);
1611 location_t src_loc
= pfile
->cur_token
[-1].src_loc
;
1612 cpp_error_with_line (pfile
, CPP_DL_ERROR
, src_loc
, 0,
1613 "invalid #pragma pop_macro directive");
1614 check_eol (pfile
, false);
1615 skip_rest_of_line (pfile
);
1618 dest
= macroname
= (char *) alloca (txt
->val
.str
.len
+ 2);
1619 src
= (const char *) (txt
->val
.str
.text
+ 1 + (txt
->val
.str
.text
[0] == 'L'));
1620 limit
= (const char *) (txt
->val
.str
.text
+ txt
->val
.str
.len
- 1);
1623 /* We know there is a character following the backslash. */
1624 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1629 check_eol (pfile
, false);
1630 skip_rest_of_line (pfile
);
1634 if (!strcmp (c
->name
, macroname
))
1637 pfile
->pushed_macros
= c
->next
;
1640 cpp_pop_definition (pfile
, c
);
1641 free (c
->definition
);
1651 /* Handle #pragma GCC poison, to poison one or more identifiers so
1652 that the lexer produces a hard error for each subsequent usage. */
1654 do_pragma_poison (cpp_reader
*pfile
)
1656 const cpp_token
*tok
;
1659 pfile
->state
.poisoned_ok
= 1;
1662 tok
= _cpp_lex_token (pfile
);
1663 if (tok
->type
== CPP_EOF
)
1665 if (tok
->type
!= CPP_NAME
)
1667 cpp_error (pfile
, CPP_DL_ERROR
,
1668 "invalid #pragma GCC poison directive");
1672 hp
= tok
->val
.node
.node
;
1673 if (hp
->flags
& NODE_POISONED
)
1676 if (cpp_macro_p (hp
))
1677 cpp_error (pfile
, CPP_DL_WARNING
, "poisoning existing macro \"%s\"",
1679 _cpp_free_definition (hp
);
1680 hp
->flags
|= NODE_POISONED
| NODE_DIAGNOSTIC
;
1682 pfile
->state
.poisoned_ok
= 0;
1685 /* Mark the current header as a system header. This will suppress
1686 some categories of warnings (notably those from -pedantic). It is
1687 intended for use in system libraries that cannot be implemented in
1688 conforming C, but cannot be certain that their headers appear in a
1689 system include directory. To prevent abuse, it is rejected in the
1690 primary source file. */
1692 do_pragma_system_header (cpp_reader
*pfile
)
1694 if (cpp_in_primary_file (pfile
))
1695 cpp_error (pfile
, CPP_DL_WARNING
,
1696 "#pragma system_header ignored outside include file");
1699 check_eol (pfile
, false);
1700 skip_rest_of_line (pfile
);
1701 cpp_make_system_header (pfile
, 1, 0);
1705 /* Check the modified date of the current include file against a specified
1706 file. Issue a diagnostic, if the specified file is newer. We use this to
1707 determine if a fixed header should be refixed. */
1709 do_pragma_dependency (cpp_reader
*pfile
)
1712 int angle_brackets
, ordering
;
1713 location_t location
;
1715 fname
= parse_include (pfile
, &angle_brackets
, NULL
, &location
);
1719 ordering
= _cpp_compare_file_date (pfile
, fname
, angle_brackets
);
1721 cpp_error (pfile
, CPP_DL_WARNING
, "cannot find source file %s", fname
);
1722 else if (ordering
> 0)
1724 cpp_error (pfile
, CPP_DL_WARNING
,
1725 "current file is older than %s", fname
);
1726 if (cpp_get_token (pfile
)->type
!= CPP_EOF
)
1728 _cpp_backup_tokens (pfile
, 1);
1729 do_diagnostic (pfile
, CPP_DL_WARNING
, CPP_W_NONE
, 0);
1733 free ((void *) fname
);
1736 /* Issue a diagnostic with the message taken from the pragma. If
1737 ERROR is true, the diagnostic is a warning, otherwise, it is an
1740 do_pragma_warning_or_error (cpp_reader
*pfile
, bool error
)
1742 const cpp_token
*tok
= _cpp_lex_token (pfile
);
1744 if (tok
->type
!= CPP_STRING
1745 || !cpp_interpret_string_notranslate (pfile
, &tok
->val
.str
, 1, &str
,
1749 cpp_error (pfile
, CPP_DL_ERROR
, "invalid \"#pragma GCC %s\" directive",
1750 error
? "error" : "warning");
1753 cpp_error (pfile
, error
? CPP_DL_ERROR
: CPP_DL_WARNING
,
1755 free ((void *)str
.text
);
1758 /* Issue a warning diagnostic. */
1760 do_pragma_warning (cpp_reader
*pfile
)
1762 do_pragma_warning_or_error (pfile
, false);
1765 /* Issue an error diagnostic. */
1767 do_pragma_error (cpp_reader
*pfile
)
1769 do_pragma_warning_or_error (pfile
, true);
1772 /* Get a token but skip padding. */
1773 static const cpp_token
*
1774 get_token_no_padding (cpp_reader
*pfile
)
1778 const cpp_token
*result
= cpp_get_token (pfile
);
1779 if (result
->type
!= CPP_PADDING
)
1784 /* Check syntax is "(string-literal)". Returns the string on success,
1785 or NULL on failure. */
1786 static const cpp_token
*
1787 get__Pragma_string (cpp_reader
*pfile
)
1789 const cpp_token
*string
;
1790 const cpp_token
*paren
;
1792 paren
= get_token_no_padding (pfile
);
1793 if (paren
->type
== CPP_EOF
)
1794 _cpp_backup_tokens (pfile
, 1);
1795 if (paren
->type
!= CPP_OPEN_PAREN
)
1798 string
= get_token_no_padding (pfile
);
1799 if (string
->type
== CPP_EOF
)
1800 _cpp_backup_tokens (pfile
, 1);
1801 if (string
->type
!= CPP_STRING
&& string
->type
!= CPP_WSTRING
1802 && string
->type
!= CPP_STRING32
&& string
->type
!= CPP_STRING16
1803 && string
->type
!= CPP_UTF8STRING
)
1806 paren
= get_token_no_padding (pfile
);
1807 if (paren
->type
== CPP_EOF
)
1808 _cpp_backup_tokens (pfile
, 1);
1809 if (paren
->type
!= CPP_CLOSE_PAREN
)
1815 /* Destringize IN into a temporary buffer, by removing the first \ of
1816 \" and \\ sequences, and process the result as a #pragma directive. */
1818 destringize_and_run (cpp_reader
*pfile
, const cpp_string
*in
,
1819 location_t expansion_loc
)
1821 const unsigned char *src
, *limit
;
1822 char *dest
, *result
;
1823 cpp_context
*saved_context
;
1824 cpp_token
*saved_cur_token
;
1825 tokenrun
*saved_cur_run
;
1828 const struct directive
*save_directive
;
1830 dest
= result
= (char *) alloca (in
->len
- 1);
1831 src
= in
->text
+ 1 + (in
->text
[0] == 'L');
1832 limit
= in
->text
+ in
->len
- 1;
1835 /* We know there is a character following the backslash. */
1836 if (*src
== '\\' && (src
[1] == '\\' || src
[1] == '"'))
1842 /* Ugh; an awful kludge. We are really not set up to be lexing
1843 tokens when in the middle of a macro expansion. Use a new
1844 context to force cpp_get_token to lex, and so skip_rest_of_line
1845 doesn't go beyond the end of the text. Also, remember the
1846 current lexing position so we can return to it later.
1848 Something like line-at-a-time lexing should remove the need for
1850 saved_context
= pfile
->context
;
1851 saved_cur_token
= pfile
->cur_token
;
1852 saved_cur_run
= pfile
->cur_run
;
1854 pfile
->context
= XCNEW (cpp_context
);
1856 /* Inline run_directive, since we need to delay the _cpp_pop_buffer
1857 until we've read all of the tokens that we want. */
1858 cpp_push_buffer (pfile
, (const uchar
*) result
, dest
- result
,
1859 /* from_stage3 */ true);
1860 /* ??? Antique Disgusting Hack. What does this do? */
1861 if (pfile
->buffer
->prev
)
1862 pfile
->buffer
->file
= pfile
->buffer
->prev
->file
;
1864 start_directive (pfile
);
1865 _cpp_clean_line (pfile
);
1866 save_directive
= pfile
->directive
;
1867 pfile
->directive
= &dtable
[T_PRAGMA
];
1869 end_directive (pfile
, 1);
1870 pfile
->directive
= save_directive
;
1872 /* We always insert at least one token, the directive result. It'll
1873 either be a CPP_PADDING or a CPP_PRAGMA. In the later case, we
1874 need to insert *all* of the tokens, including the CPP_PRAGMA_EOL. */
1876 /* If we're not handling the pragma internally, read all of the tokens from
1877 the string buffer now, while the string buffer is still installed. */
1878 /* ??? Note that the token buffer allocated here is leaked. It's not clear
1879 to me what the true lifespan of the tokens are. It would appear that
1880 the lifespan is the entire parse of the main input stream, in which case
1881 this may not be wrong. */
1882 if (pfile
->directive_result
.type
== CPP_PRAGMA
)
1888 toks
= XNEWVEC (cpp_token
, maxcount
);
1889 toks
[0] = pfile
->directive_result
;
1893 if (count
== maxcount
)
1895 maxcount
= maxcount
* 3 / 2;
1896 toks
= XRESIZEVEC (cpp_token
, toks
, maxcount
);
1898 toks
[count
] = *cpp_get_token (pfile
);
1899 /* _Pragma is a builtin, so we're not within a macro-map, and so
1900 the token locations are set to bogus ordinary locations
1901 near to, but after that of the "_Pragma".
1902 Paper over this by setting them equal to the location of the
1903 _Pragma itself (PR preprocessor/69126). */
1904 toks
[count
].src_loc
= expansion_loc
;
1905 /* Macros have been already expanded by cpp_get_token
1906 if the pragma allowed expansion. */
1907 toks
[count
++].flags
|= NO_EXPAND
;
1909 while (toks
[count
-1].type
!= CPP_PRAGMA_EOL
);
1914 toks
= XNEW (cpp_token
);
1915 toks
[0] = pfile
->directive_result
;
1917 /* If we handled the entire pragma internally, make sure we get the
1918 line number correct for the next token. */
1919 if (pfile
->cb
.line_change
)
1920 pfile
->cb
.line_change (pfile
, pfile
->cur_token
, false);
1923 /* Finish inlining run_directive. */
1924 pfile
->buffer
->file
= NULL
;
1925 _cpp_pop_buffer (pfile
);
1927 /* Reset the old macro state before ... */
1928 XDELETE (pfile
->context
);
1929 pfile
->context
= saved_context
;
1930 pfile
->cur_token
= saved_cur_token
;
1931 pfile
->cur_run
= saved_cur_run
;
1933 /* ... inserting the new tokens we collected. */
1934 _cpp_push_token_context (pfile
, NULL
, toks
, count
);
1937 /* Handle the _Pragma operator. Return 0 on error, 1 if ok. */
1939 _cpp_do__Pragma (cpp_reader
*pfile
, location_t expansion_loc
)
1941 const cpp_token
*string
= get__Pragma_string (pfile
);
1942 pfile
->directive_result
.type
= CPP_PADDING
;
1946 destringize_and_run (pfile
, &string
->val
.str
, expansion_loc
);
1949 cpp_error (pfile
, CPP_DL_ERROR
,
1950 "_Pragma takes a parenthesized string literal");
1954 /* Handle #ifdef. */
1956 do_ifdef (cpp_reader
*pfile
)
1960 if (! pfile
->state
.skipping
)
1962 cpp_hashnode
*node
= lex_macro_node (pfile
, false);
1966 skip
= !_cpp_defined_macro_p (node
);
1967 _cpp_mark_macro_used (node
);
1968 _cpp_maybe_notify_macro_use (pfile
, node
);
1970 pfile
->cb
.used (pfile
, pfile
->directive_line
, node
);
1971 check_eol (pfile
, false);
1975 push_conditional (pfile
, skip
, T_IFDEF
, 0);
1978 /* Handle #ifndef. */
1980 do_ifndef (cpp_reader
*pfile
)
1983 cpp_hashnode
*node
= 0;
1985 if (! pfile
->state
.skipping
)
1987 node
= lex_macro_node (pfile
, false);
1991 /* Do not treat conditional macros as being defined. This is due to
1992 the powerpc port using conditional macros for 'vector', 'bool',
1993 and 'pixel' to act as conditional keywords. This messes up tests
1994 like #ifndef bool. */
1995 skip
= _cpp_defined_macro_p (node
);
1996 _cpp_mark_macro_used (node
);
1997 _cpp_maybe_notify_macro_use (pfile
, node
);
1999 pfile
->cb
.used (pfile
, pfile
->directive_line
, node
);
2000 check_eol (pfile
, false);
2004 push_conditional (pfile
, skip
, T_IFNDEF
, node
);
2007 /* _cpp_parse_expr puts a macro in a "#if !defined ()" expression in
2008 pfile->mi_ind_cmacro so we can handle multiple-include
2009 optimizations. If macro expansion occurs in the expression, we
2010 cannot treat it as a controlling conditional, since the expansion
2011 could change in the future. That is handled by cpp_get_token. */
2013 do_if (cpp_reader
*pfile
)
2017 if (! pfile
->state
.skipping
)
2018 skip
= _cpp_parse_expr (pfile
, true) == false;
2020 push_conditional (pfile
, skip
, T_IF
, pfile
->mi_ind_cmacro
);
2023 /* Flip skipping state if appropriate and continue without changing
2024 if_stack; this is so that the error message for missing #endif's
2025 etc. will point to the original #if. */
2027 do_else (cpp_reader
*pfile
)
2029 cpp_buffer
*buffer
= pfile
->buffer
;
2030 struct if_stack
*ifs
= buffer
->if_stack
;
2033 cpp_error (pfile
, CPP_DL_ERROR
, "#else without #if");
2036 if (ifs
->type
== T_ELSE
)
2038 cpp_error (pfile
, CPP_DL_ERROR
, "#else after #else");
2039 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2040 "the conditional began here");
2044 /* Skip any future (erroneous) #elses or #elifs. */
2045 pfile
->state
.skipping
= ifs
->skip_elses
;
2046 ifs
->skip_elses
= true;
2048 /* Invalidate any controlling macro. */
2051 /* Only check EOL if was not originally skipping. */
2052 if (!ifs
->was_skipping
&& CPP_OPTION (pfile
, warn_endif_labels
))
2053 check_eol_endif_labels (pfile
);
2057 /* Handle a #elif directive by not changing if_stack either. See the
2058 comment above do_else. */
2060 do_elif (cpp_reader
*pfile
)
2062 cpp_buffer
*buffer
= pfile
->buffer
;
2063 struct if_stack
*ifs
= buffer
->if_stack
;
2066 cpp_error (pfile
, CPP_DL_ERROR
, "#elif without #if");
2069 if (ifs
->type
== T_ELSE
)
2071 cpp_error (pfile
, CPP_DL_ERROR
, "#elif after #else");
2072 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2073 "the conditional began here");
2077 /* See DR#412: "Only the first group whose control condition
2078 evaluates to true (nonzero) is processed; any following groups
2079 are skipped and their controlling directives are processed as
2080 if they were in a group that is skipped." */
2081 if (ifs
->skip_elses
)
2082 pfile
->state
.skipping
= 1;
2085 pfile
->state
.skipping
= ! _cpp_parse_expr (pfile
, false);
2086 ifs
->skip_elses
= ! pfile
->state
.skipping
;
2089 /* Invalidate any controlling macro. */
2094 /* #endif pops the if stack and resets pfile->state.skipping. */
2096 do_endif (cpp_reader
*pfile
)
2098 cpp_buffer
*buffer
= pfile
->buffer
;
2099 struct if_stack
*ifs
= buffer
->if_stack
;
2102 cpp_error (pfile
, CPP_DL_ERROR
, "#endif without #if");
2105 /* Only check EOL if was not originally skipping. */
2106 if (!ifs
->was_skipping
&& CPP_OPTION (pfile
, warn_endif_labels
))
2107 check_eol_endif_labels (pfile
);
2109 /* If potential control macro, we go back outside again. */
2110 if (ifs
->next
== 0 && ifs
->mi_cmacro
)
2112 pfile
->mi_valid
= true;
2113 pfile
->mi_cmacro
= ifs
->mi_cmacro
;
2116 buffer
->if_stack
= ifs
->next
;
2117 pfile
->state
.skipping
= ifs
->was_skipping
;
2118 obstack_free (&pfile
->buffer_ob
, ifs
);
2122 /* Push an if_stack entry for a preprocessor conditional, and set
2123 pfile->state.skipping to SKIP. If TYPE indicates the conditional
2124 is #if or #ifndef, CMACRO is a potentially controlling macro, and
2125 we need to check here that we are at the top of the file. */
2127 push_conditional (cpp_reader
*pfile
, int skip
, int type
,
2128 const cpp_hashnode
*cmacro
)
2130 struct if_stack
*ifs
;
2131 cpp_buffer
*buffer
= pfile
->buffer
;
2133 ifs
= XOBNEW (&pfile
->buffer_ob
, struct if_stack
);
2134 ifs
->line
= pfile
->directive_line
;
2135 ifs
->next
= buffer
->if_stack
;
2136 ifs
->skip_elses
= pfile
->state
.skipping
|| !skip
;
2137 ifs
->was_skipping
= pfile
->state
.skipping
;
2139 /* This condition is effectively a test for top-of-file. */
2140 if (pfile
->mi_valid
&& pfile
->mi_cmacro
== 0)
2141 ifs
->mi_cmacro
= cmacro
;
2145 pfile
->state
.skipping
= skip
;
2146 buffer
->if_stack
= ifs
;
2149 /* Read the tokens of the answer into the macro pool, in a directive
2150 of type TYPE. Only commit the memory if we intend it as permanent
2151 storage, i.e. the #assert case. Returns 0 on success, and sets
2152 ANSWERP to point to the answer. PRED_LOC is the location of the
2155 parse_answer (cpp_reader
*pfile
, int type
, location_t pred_loc
,
2156 cpp_macro
**answer_ptr
)
2158 /* In a conditional, it is legal to not have an open paren. We
2159 should save the following token in this case. */
2160 const cpp_token
*paren
= cpp_get_token (pfile
);
2162 /* If not a paren, see if we're OK. */
2163 if (paren
->type
!= CPP_OPEN_PAREN
)
2165 /* In a conditional no answer is a test for any answer. It
2166 could be followed by any token. */
2169 _cpp_backup_tokens (pfile
, 1);
2173 /* #unassert with no answer is valid - it removes all answers. */
2174 if (type
== T_UNASSERT
&& paren
->type
== CPP_EOF
)
2177 cpp_error_with_line (pfile
, CPP_DL_ERROR
, pred_loc
, 0,
2178 "missing '(' after predicate");
2182 cpp_macro
*answer
= _cpp_new_macro (pfile
, cmk_assert
,
2183 _cpp_reserve_room (pfile
, 0,
2184 sizeof (cpp_macro
)));
2185 answer
->parm
.next
= NULL
;
2189 const cpp_token
*token
= cpp_get_token (pfile
);
2191 if (token
->type
== CPP_CLOSE_PAREN
)
2194 if (token
->type
== CPP_EOF
)
2196 cpp_error (pfile
, CPP_DL_ERROR
, "missing ')' to complete answer");
2200 answer
= (cpp_macro
*)_cpp_reserve_room
2201 (pfile
, sizeof (cpp_macro
) + count
* sizeof (cpp_token
),
2202 sizeof (cpp_token
));
2203 answer
->exp
.tokens
[count
++] = *token
;
2208 cpp_error (pfile
, CPP_DL_ERROR
, "predicate's answer is empty");
2212 /* Drop whitespace at start, for answer equivalence purposes. */
2213 answer
->exp
.tokens
[0].flags
&= ~PREV_WHITE
;
2215 answer
->count
= count
;
2216 *answer_ptr
= answer
;
2221 /* Parses an assertion directive of type TYPE, returning a pointer to
2222 the hash node of the predicate, or 0 on error. The node is
2223 guaranteed to be disjoint from the macro namespace, so can only
2224 have type 'NT_VOID'. If an answer was supplied, it is placed in
2225 *ANSWER_PTR, which is otherwise set to 0. */
2226 static cpp_hashnode
*
2227 parse_assertion (cpp_reader
*pfile
, int type
, cpp_macro
**answer_ptr
)
2229 cpp_hashnode
*result
= 0;
2231 /* We don't expand predicates or answers. */
2232 pfile
->state
.prevent_expansion
++;
2236 const cpp_token
*predicate
= cpp_get_token (pfile
);
2237 if (predicate
->type
== CPP_EOF
)
2238 cpp_error (pfile
, CPP_DL_ERROR
, "assertion without predicate");
2239 else if (predicate
->type
!= CPP_NAME
)
2240 cpp_error_with_line (pfile
, CPP_DL_ERROR
, predicate
->src_loc
, 0,
2241 "predicate must be an identifier");
2242 else if (parse_answer (pfile
, type
, predicate
->src_loc
, answer_ptr
))
2244 unsigned int len
= NODE_LEN (predicate
->val
.node
.node
);
2245 unsigned char *sym
= (unsigned char *) alloca (len
+ 1);
2247 /* Prefix '#' to get it out of macro namespace. */
2249 memcpy (sym
+ 1, NODE_NAME (predicate
->val
.node
.node
), len
);
2250 result
= cpp_lookup (pfile
, sym
, len
+ 1);
2253 pfile
->state
.prevent_expansion
--;
2258 /* Returns a pointer to the pointer to CANDIDATE in the answer chain,
2259 or a pointer to NULL if the answer is not in the chain. */
2261 find_answer (cpp_hashnode
*node
, const cpp_macro
*candidate
)
2264 cpp_macro
**result
= NULL
;
2266 for (result
= &node
->value
.answers
; *result
; result
= &(*result
)->parm
.next
)
2268 cpp_macro
*answer
= *result
;
2270 if (answer
->count
== candidate
->count
)
2272 for (i
= 0; i
< answer
->count
; i
++)
2273 if (!_cpp_equiv_tokens (&answer
->exp
.tokens
[i
],
2274 &candidate
->exp
.tokens
[i
]))
2277 if (i
== answer
->count
)
2285 /* Test an assertion within a preprocessor conditional. Returns
2286 nonzero on failure, zero on success. On success, the result of
2287 the test is written into VALUE, otherwise the value 0. */
2289 _cpp_test_assertion (cpp_reader
*pfile
, unsigned int *value
)
2292 cpp_hashnode
*node
= parse_assertion (pfile
, T_IF
, &answer
);
2294 /* For recovery, an erroneous assertion expression is handled as a
2295 failing assertion. */
2300 if (node
->value
.answers
)
2301 *value
= !answer
|| *find_answer (node
, answer
);
2303 else if (pfile
->cur_token
[-1].type
== CPP_EOF
)
2304 _cpp_backup_tokens (pfile
, 1);
2306 /* We don't commit the memory for the answer - it's temporary only. */
2310 /* Handle #assert. */
2312 do_assert (cpp_reader
*pfile
)
2315 cpp_hashnode
*node
= parse_assertion (pfile
, T_ASSERT
, &answer
);
2319 /* Place the new answer in the answer list. First check there
2320 is not a duplicate. */
2321 if (*find_answer (node
, answer
))
2323 cpp_error (pfile
, CPP_DL_WARNING
, "\"%s\" re-asserted",
2324 NODE_NAME (node
) + 1);
2328 /* Commit or allocate storage for the answer. */
2329 answer
= (cpp_macro
*)_cpp_commit_buff
2330 (pfile
, sizeof (cpp_macro
) - sizeof (cpp_token
)
2331 + sizeof (cpp_token
) * answer
->count
);
2333 /* Chain into the list. */
2334 answer
->parm
.next
= node
->value
.answers
;
2335 node
->value
.answers
= answer
;
2337 check_eol (pfile
, false);
2341 /* Handle #unassert. */
2343 do_unassert (cpp_reader
*pfile
)
2346 cpp_hashnode
*node
= parse_assertion (pfile
, T_UNASSERT
, &answer
);
2348 /* It isn't an error to #unassert something that isn't asserted. */
2353 cpp_macro
**p
= find_answer (node
, answer
);
2355 /* Remove the assert from the list. */
2356 if (cpp_macro
*temp
= *p
)
2357 *p
= temp
->parm
.next
;
2359 check_eol (pfile
, false);
2362 _cpp_free_definition (node
);
2365 /* We don't commit the memory for the answer - it's temporary only. */
2368 /* These are for -D, -U, -A. */
2370 /* Process the string STR as if it appeared as the body of a #define.
2371 If STR is just an identifier, define it with value 1.
2372 If STR has anything after the identifier, then it should
2373 be identifier=definition. */
2375 cpp_define (cpp_reader
*pfile
, const char *str
)
2381 /* Copy the entire option so we can modify it.
2382 Change the first "=" in the string to a space. If there is none,
2383 tack " 1" on the end. */
2385 count
= strlen (str
);
2386 buf
= (char *) alloca (count
+ 3);
2387 memcpy (buf
, str
, count
);
2389 p
= strchr (str
, '=');
2399 run_directive (pfile
, T_DEFINE
, buf
, count
);
2403 /* Use to build macros to be run through cpp_define() as
2405 Example: cpp_define_formatted (pfile, "MACRO=%d", value); */
2408 cpp_define_formatted (cpp_reader
*pfile
, const char *fmt
, ...)
2414 ptr
= xvasprintf (fmt
, ap
);
2417 cpp_define (pfile
, ptr
);
2422 /* Slight variant of the above for use by initialize_builtins. */
2424 _cpp_define_builtin (cpp_reader
*pfile
, const char *str
)
2426 size_t len
= strlen (str
);
2427 char *buf
= (char *) alloca (len
+ 1);
2428 memcpy (buf
, str
, len
);
2430 run_directive (pfile
, T_DEFINE
, buf
, len
);
2433 /* Process MACRO as if it appeared as the body of an #undef. */
2435 cpp_undef (cpp_reader
*pfile
, const char *macro
)
2437 size_t len
= strlen (macro
);
2438 char *buf
= (char *) alloca (len
+ 1);
2439 memcpy (buf
, macro
, len
);
2441 run_directive (pfile
, T_UNDEF
, buf
, len
);
2444 /* Replace a previous definition DEF of the macro STR. If DEF is NULL,
2445 or first element is zero, then the macro should be undefined. */
2447 cpp_pop_definition (cpp_reader
*pfile
, struct def_pragma_macro
*c
)
2449 cpp_hashnode
*node
= _cpp_lex_identifier (pfile
, c
->name
);
2453 if (pfile
->cb
.before_define
)
2454 pfile
->cb
.before_define (pfile
);
2456 if (cpp_macro_p (node
))
2458 if (pfile
->cb
.undef
)
2459 pfile
->cb
.undef (pfile
, pfile
->directive_line
, node
);
2460 if (CPP_OPTION (pfile
, warn_unused_macros
))
2461 _cpp_warn_if_unused_macro (pfile
, node
, NULL
);
2462 _cpp_free_definition (node
);
2469 _cpp_restore_special_builtin (pfile
, c
);
2476 cpp_hashnode
*h
= NULL
;
2479 namelen
= ustrcspn (c
->definition
, "( \n");
2480 h
= cpp_lookup (pfile
, c
->definition
, namelen
);
2481 dn
= c
->definition
+ namelen
;
2483 nbuf
= cpp_push_buffer (pfile
, dn
, ustrchr (dn
, '\n') - dn
, true);
2486 _cpp_clean_line (pfile
);
2488 if (!_cpp_create_definition (pfile
, h
))
2490 _cpp_pop_buffer (pfile
);
2494 h
->value
.macro
->line
= c
->line
;
2495 h
->value
.macro
->syshdr
= c
->syshdr
;
2496 h
->value
.macro
->used
= c
->used
;
2500 /* Process the string STR as if it appeared as the body of a #assert. */
2502 cpp_assert (cpp_reader
*pfile
, const char *str
)
2504 handle_assertion (pfile
, str
, T_ASSERT
);
2507 /* Process STR as if it appeared as the body of an #unassert. */
2509 cpp_unassert (cpp_reader
*pfile
, const char *str
)
2511 handle_assertion (pfile
, str
, T_UNASSERT
);
2514 /* Common code for cpp_assert (-A) and cpp_unassert (-A-). */
2516 handle_assertion (cpp_reader
*pfile
, const char *str
, int type
)
2518 size_t count
= strlen (str
);
2519 const char *p
= strchr (str
, '=');
2521 /* Copy the entire option so we can modify it. Change the first
2522 "=" in the string to a '(', and tack a ')' on the end. */
2523 char *buf
= (char *) alloca (count
+ 2);
2525 memcpy (buf
, str
, count
);
2534 run_directive (pfile
, type
, str
, count
);
2537 /* The options structure. */
2539 cpp_get_options (cpp_reader
*pfile
)
2541 return &pfile
->opts
;
2544 /* The callbacks structure. */
2546 cpp_get_callbacks (cpp_reader
*pfile
)
2551 /* Copy the given callbacks structure to our own. */
2553 cpp_set_callbacks (cpp_reader
*pfile
, cpp_callbacks
*cb
)
2558 /* The dependencies structure. (Creates one if it hasn't already been.) */
2560 cpp_get_deps (cpp_reader
*pfile
)
2563 pfile
->deps
= deps_init ();
2567 /* Push a new buffer on the buffer stack. Returns the new buffer; it
2568 doesn't fail. It does not generate a file change call back; that
2569 is the responsibility of the caller. */
2571 cpp_push_buffer (cpp_reader
*pfile
, const uchar
*buffer
, size_t len
,
2574 cpp_buffer
*new_buffer
= XOBNEW (&pfile
->buffer_ob
, cpp_buffer
);
2576 /* Clears, amongst other things, if_stack and mi_cmacro. */
2577 memset (new_buffer
, 0, sizeof (cpp_buffer
));
2579 new_buffer
->next_line
= new_buffer
->buf
= buffer
;
2580 new_buffer
->rlimit
= buffer
+ len
;
2581 new_buffer
->from_stage3
= from_stage3
;
2582 new_buffer
->prev
= pfile
->buffer
;
2583 new_buffer
->need_line
= true;
2585 pfile
->buffer
= new_buffer
;
2590 /* Pops a single buffer, with a file change call-back if appropriate.
2591 Then pushes the next -include file, if any remain. */
2593 _cpp_pop_buffer (cpp_reader
*pfile
)
2595 cpp_buffer
*buffer
= pfile
->buffer
;
2596 struct _cpp_file
*inc
= buffer
->file
;
2597 struct if_stack
*ifs
;
2598 const unsigned char *to_free
;
2600 /* Walk back up the conditional stack till we reach its level at
2601 entry to this file, issuing error messages. */
2602 for (ifs
= buffer
->if_stack
; ifs
; ifs
= ifs
->next
)
2603 cpp_error_with_line (pfile
, CPP_DL_ERROR
, ifs
->line
, 0,
2604 "unterminated #%s", dtable
[ifs
->type
].name
);
2606 /* In case of a missing #endif. */
2607 pfile
->state
.skipping
= 0;
2609 /* _cpp_do_file_change expects pfile->buffer to be the new one. */
2610 pfile
->buffer
= buffer
->prev
;
2612 to_free
= buffer
->to_free
;
2613 free (buffer
->notes
);
2615 /* Free the buffer object now; we may want to push a new buffer
2616 in _cpp_push_next_include_file. */
2617 obstack_free (&pfile
->buffer_ob
, buffer
);
2621 _cpp_pop_file_buffer (pfile
, inc
, to_free
);
2623 _cpp_do_file_change (pfile
, LC_LEAVE
, 0, 0, 0);
2626 free ((void *)to_free
);
2629 /* Enter all recognized directives in the hash table. */
2631 _cpp_init_directives (cpp_reader
*pfile
)
2633 for (int i
= 0; i
< N_DIRECTIVES
; i
++)
2635 cpp_hashnode
*node
= cpp_lookup (pfile
, dtable
[i
].name
, dtable
[i
].length
);
2636 node
->is_directive
= 1;
2637 node
->directive_index
= i
;
2641 /* Extract header file from a bracket include. Parsing starts after '<'.
2642 The string is malloced and must be freed by the caller. */
2644 _cpp_bracket_include(cpp_reader
*pfile
)
2646 return glue_header_name (pfile
);