1 /* CPP Library. (Directive handling.)
2 Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
4 Contributed by Per Bothner, 1994-95.
5 Based on CCCP program by Paul Rubin, June 1986
6 Adapted to ANSI C, Richard Stallman, Jan 1987
8 This program is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
28 /* Chained list of answers to an assertion. */
36 /* Stack of conditionals currently in progress
37 (including both successful and failing conditionals). */
40 struct if_stack *next;
41 unsigned int line; /* Line where condition started. */
42 const cpp_hashnode *mi_cmacro;/* macro name for #ifndef around entire file */
43 bool skip_elses; /* Can future #else / #elif be skipped? */
44 bool was_skipping; /* If were skipping on entry. */
45 int type; /* Most recent conditional for diagnostics. */
48 /* Contains a registered pragma or pragma namespace. */
49 typedef void (*pragma_cb) (cpp_reader *);
52 struct pragma_entry *next;
53 const cpp_hashnode *pragma; /* Name and length. */
57 struct pragma_entry *space;
61 /* Values for the origin field of struct directive. KANDR directives
62 come from traditional (K&R) C. STDC89 directives come from the
63 1989 C standard. EXTENSION directives are extensions. */
68 /* Values for the flags field of struct directive. COND indicates a
69 conditional; IF_COND an opening conditional. INCL means to treat
70 "..." and <...> as q-char and h-char sequences respectively. IN_I
71 means this directive should be handled even if -fpreprocessed is in
72 effect (these are the directives with callback hooks).
74 EXPAND is set on directives that are always macro-expanded. */
76 #define IF_COND (1 << 1)
79 #define EXPAND (1 << 4)
81 /* Defines one #-directive, including how to handle it. */
82 typedef void (*directive_handler) (cpp_reader *);
83 typedef struct directive directive;
86 directive_handler handler; /* Function to handle directive. */
87 const uchar *name; /* Name of directive. */
88 unsigned short length; /* Length of name. */
89 unsigned char origin; /* Origin of directive. */
90 unsigned char flags; /* Flags describing this directive. */
93 /* Forward declarations. */
95 static void skip_rest_of_line (cpp_reader *);
96 static void check_eol (cpp_reader *);
97 static void start_directive (cpp_reader *);
98 static void prepare_directive_trad (cpp_reader *);
99 static void end_directive (cpp_reader *, int);
100 static void directive_diagnostics (cpp_reader *, const directive *, int);
101 static void run_directive (cpp_reader *, int, const char *, size_t);
102 static char *glue_header_name (cpp_reader *);
103 static const char *parse_include (cpp_reader *, int *);
104 static void push_conditional (cpp_reader *, int, int, const cpp_hashnode *);
105 static unsigned int read_flag (cpp_reader *, unsigned int);
106 static int strtoul_for_line (const uchar *, unsigned int, unsigned long *);
107 static void do_diagnostic (cpp_reader *, int, int);
108 static cpp_hashnode *lex_macro_node (cpp_reader *);
109 static int undefine_macros (cpp_reader *, cpp_hashnode *, void *);
110 static void do_include_common (cpp_reader *, enum include_type);
111 static struct pragma_entry *lookup_pragma_entry (struct pragma_entry *,
112 const cpp_hashnode *);
113 static struct pragma_entry *insert_pragma_entry (cpp_reader *,
114 struct pragma_entry **,
115 const cpp_hashnode *,
117 static int count_registered_pragmas (struct pragma_entry *);
118 static char ** save_registered_pragmas (struct pragma_entry *, char **);
119 static char ** restore_registered_pragmas (cpp_reader *, struct pragma_entry *,
121 static void do_pragma_once (cpp_reader *);
122 static void do_pragma_poison (cpp_reader *);
123 static void do_pragma_system_header (cpp_reader *);
124 static void do_pragma_dependency (cpp_reader *);
125 static void do_linemarker (cpp_reader *);
126 static const cpp_token *get_token_no_padding (cpp_reader *);
127 static const cpp_token *get__Pragma_string (cpp_reader *);
128 static void destringize_and_run (cpp_reader *, const cpp_string *);
129 static int parse_answer (cpp_reader *, struct answer **, int);
130 static cpp_hashnode *parse_assertion (cpp_reader *, struct answer **, int);
131 static struct answer ** find_answer (cpp_hashnode *, const struct answer *);
132 static void handle_assertion (cpp_reader *, const char *, int);
134 /* This is the table of directive handlers. It is ordered by
135 frequency of occurrence; the numbers at the end are directive
136 counts from all the source code I have lying around (egcs and libc
137 CVS as of 1999-05-18, plus grub-0.5.91, linux-2.2.9, and
138 pcmcia-cs-3.0.9). This is no longer important as directive lookup
139 is now O(1). All extensions other than #warning and #include_next
140 are deprecated. The name is where the extension appears to have
143 #define DIRECTIVE_TABLE \
144 D(define, T_DEFINE = 0, KANDR, IN_I) /* 270554 */ \
145 D(include, T_INCLUDE, KANDR, INCL | EXPAND) /* 52262 */ \
146 D(endif, T_ENDIF, KANDR, COND) /* 45855 */ \
147 D(ifdef, T_IFDEF, KANDR, COND | IF_COND) /* 22000 */ \
148 D(if, T_IF, KANDR, COND | IF_COND | EXPAND) /* 18162 */ \
149 D(else, T_ELSE, KANDR, COND) /* 9863 */ \
150 D(ifndef, T_IFNDEF, KANDR, COND | IF_COND) /* 9675 */ \
151 D(undef, T_UNDEF, KANDR, IN_I) /* 4837 */ \
152 D(line, T_LINE, KANDR, EXPAND) /* 2465 */ \
153 D(elif, T_ELIF, STDC89, COND | EXPAND) /* 610 */ \
154 D(error, T_ERROR, STDC89, 0) /* 475 */ \
155 D(pragma, T_PRAGMA, STDC89, IN_I) /* 195 */ \
156 D(warning, T_WARNING, EXTENSION, 0) /* 22 */ \
157 D(include_next, T_INCLUDE_NEXT, EXTENSION, INCL | EXPAND) /* 19 */ \
158 D(ident, T_IDENT, EXTENSION, IN_I) /* 11 */ \
159 D(import, T_IMPORT, EXTENSION, INCL | EXPAND) /* 0 ObjC */ \
160 D(assert, T_ASSERT, EXTENSION, 0) /* 0 SVR4 */ \
161 D(unassert, T_UNASSERT, EXTENSION, 0) /* 0 SVR4 */ \
162 D(sccs, T_SCCS, EXTENSION, 0) /* 0 SVR4? */
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[] =
187 #undef DIRECTIVE_TABLE
189 /* Wrapper struct directive for linemarkers.
190 The origin is more or less true - the original K+R cpp
191 did use this notation in its preprocessed output. */
192 static const directive linemarker_dir =
194 do_linemarker, U"#", 1, KANDR, IN_I
197 #define SEEN_EOL() (pfile->cur_token[-1].type == CPP_EOF)
199 /* Skip any remaining tokens in a directive. */
201 skip_rest_of_line (cpp_reader *pfile)
203 /* Discard all stacked contexts. */
204 while (pfile->context->prev)
205 _cpp_pop_context (pfile);
207 /* Sweep up all tokens remaining on the line. */
209 while (_cpp_lex_token (pfile)->type != CPP_EOF)
213 /* Ensure there are no stray tokens at the end of a directive. */
215 check_eol (cpp_reader *pfile)
217 if (! SEEN_EOL () && _cpp_lex_token (pfile)->type != CPP_EOF)
218 cpp_error (pfile, CPP_DL_PEDWARN, "extra tokens at end of #%s directive",
219 pfile->directive->name);
222 /* Called when entering a directive, _Pragma or command-line directive. */
224 start_directive (cpp_reader *pfile)
226 /* Setup in-directive state. */
227 pfile->state.in_directive = 1;
228 pfile->state.save_comments = 0;
230 /* Some handlers need the position of the # for diagnostics. */
231 pfile->directive_line = pfile->line;
234 /* Called when leaving a directive, _Pragma or command-line directive. */
236 end_directive (cpp_reader *pfile, int skip_line)
238 if (CPP_OPTION (pfile, traditional))
240 /* Revert change of prepare_directive_trad. */
241 pfile->state.prevent_expansion--;
243 if (pfile->directive != &dtable[T_DEFINE])
244 _cpp_remove_overlay (pfile);
246 /* We don't skip for an assembler #. */
249 skip_rest_of_line (pfile);
250 if (!pfile->keep_tokens)
252 pfile->cur_run = &pfile->base_run;
253 pfile->cur_token = pfile->base_run.base;
258 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
259 pfile->state.in_directive = 0;
260 pfile->state.in_expression = 0;
261 pfile->state.angled_headers = 0;
262 pfile->directive = 0;
265 /* Prepare to handle the directive in pfile->directive. */
267 prepare_directive_trad (cpp_reader *pfile)
269 if (pfile->directive != &dtable[T_DEFINE])
271 bool no_expand = (pfile->directive
272 && ! (pfile->directive->flags & EXPAND));
273 bool was_skipping = pfile->state.skipping;
275 pfile->state.in_expression = (pfile->directive == &dtable[T_IF]
276 || pfile->directive == &dtable[T_ELIF]);
277 if (pfile->state.in_expression)
278 pfile->state.skipping = false;
281 pfile->state.prevent_expansion++;
282 _cpp_scan_out_logical_line (pfile, NULL);
284 pfile->state.prevent_expansion--;
286 pfile->state.skipping = was_skipping;
287 _cpp_overlay_buffer (pfile, pfile->out.base,
288 pfile->out.cur - pfile->out.base);
291 /* Stop ISO C from expanding anything. */
292 pfile->state.prevent_expansion++;
295 /* Output diagnostics for a directive DIR. INDENTED is nonzero if
296 the '#' was indented. */
298 directive_diagnostics (cpp_reader *pfile, const directive *dir, int indented)
300 /* Issue -pedantic warnings for extensions. */
301 if (CPP_PEDANTIC (pfile)
302 && ! pfile->state.skipping
303 && dir->origin == EXTENSION)
304 cpp_error (pfile, CPP_DL_PEDWARN, "#%s is a GCC extension", dir->name);
306 /* Traditionally, a directive is ignored unless its # is in
307 column 1. Therefore in code intended to work with K+R
308 compilers, directives added by C89 must have their #
309 indented, and directives present in traditional C must not.
310 This is true even of directives in skipped conditional
311 blocks. #elif cannot be used at all. */
312 if (CPP_WTRADITIONAL (pfile))
314 if (dir == &dtable[T_ELIF])
315 cpp_error (pfile, CPP_DL_WARNING,
316 "suggest not using #elif in traditional C");
317 else if (indented && dir->origin == KANDR)
318 cpp_error (pfile, CPP_DL_WARNING,
319 "traditional C ignores #%s with the # indented",
321 else if (!indented && dir->origin != KANDR)
322 cpp_error (pfile, CPP_DL_WARNING,
323 "suggest hiding #%s from traditional C with an indented #",
328 /* Check if we have a known directive. INDENTED is nonzero if the
329 '#' of the directive was indented. This function is in this file
330 to save unnecessarily exporting dtable etc. to cpplex.c. Returns
331 nonzero if the line of tokens has been handled, zero if we should
332 continue processing the line. */
334 _cpp_handle_directive (cpp_reader *pfile, int indented)
336 const directive *dir = 0;
337 const cpp_token *dname;
338 bool was_parsing_args = pfile->state.parsing_args;
341 if (was_parsing_args)
343 if (CPP_OPTION (pfile, pedantic))
344 cpp_error (pfile, CPP_DL_PEDWARN,
345 "embedding a directive within macro arguments is not portable");
346 pfile->state.parsing_args = 0;
347 pfile->state.prevent_expansion = 0;
349 start_directive (pfile);
350 dname = _cpp_lex_token (pfile);
352 if (dname->type == CPP_NAME)
354 if (dname->val.node->is_directive)
355 dir = &dtable[dname->val.node->directive_index];
357 /* We do not recognize the # followed by a number extension in
359 else if (dname->type == CPP_NUMBER && CPP_OPTION (pfile, lang) != CLK_ASM)
361 dir = &linemarker_dir;
362 if (CPP_PEDANTIC (pfile) && ! CPP_OPTION (pfile, preprocessed)
363 && ! pfile->state.skipping)
364 cpp_error (pfile, CPP_DL_PEDWARN,
365 "style of line directive is a GCC extension");
370 /* If we have a directive that is not an opening conditional,
371 invalidate any control macro. */
372 if (! (dir->flags & IF_COND))
373 pfile->mi_valid = false;
375 /* Kluge alert. In order to be sure that code like this
380 does not cause '#define foo bar' to get executed when
381 compiled with -save-temps, we recognize directives in
382 -fpreprocessed mode only if the # is in column 1. cppmacro.c
383 puts a space in front of any '#' at the start of a macro. */
384 if (CPP_OPTION (pfile, preprocessed)
385 && (indented || !(dir->flags & IN_I)))
392 /* In failed conditional groups, all non-conditional
393 directives are ignored. Before doing that, whether
394 skipping or not, we should lex angle-bracketed headers
395 correctly, and maybe output some diagnostics. */
396 pfile->state.angled_headers = dir->flags & INCL;
397 pfile->state.directive_wants_padding = dir->flags & INCL;
398 if (! CPP_OPTION (pfile, preprocessed))
399 directive_diagnostics (pfile, dir, indented);
400 if (pfile->state.skipping && !(dir->flags & COND))
404 else if (dname->type == CPP_EOF)
405 ; /* CPP_EOF is the "null directive". */
408 /* An unknown directive. Don't complain about it in assembly
409 source: we don't know where the comments are, and # may
410 introduce assembler pseudo-ops. Don't complain about invalid
411 directives in skipped conditional groups (6.10 p4). */
412 if (CPP_OPTION (pfile, lang) == CLK_ASM)
414 else if (!pfile->state.skipping)
415 cpp_error (pfile, CPP_DL_ERROR, "invalid preprocessing directive #%s",
416 cpp_token_as_text (pfile, dname));
419 pfile->directive = dir;
420 if (CPP_OPTION (pfile, traditional))
421 prepare_directive_trad (pfile);
424 pfile->directive->handler (pfile);
426 _cpp_backup_tokens (pfile, 1);
428 end_directive (pfile, skip);
429 if (was_parsing_args)
431 /* Restore state when within macro args. */
432 pfile->state.parsing_args = 2;
433 pfile->state.prevent_expansion = 1;
438 /* Directive handler wrapper used by the command line option
439 processor. BUF is \n terminated. */
441 run_directive (cpp_reader *pfile, int dir_no, const char *buf, size_t count)
443 cpp_push_buffer (pfile, (const uchar *) buf, count,
444 /* from_stage3 */ true);
445 /* Disgusting hack. */
446 if (dir_no == T_PRAGMA)
447 pfile->buffer->file = pfile->buffer->prev->file;
448 start_directive (pfile);
450 /* This is a short-term fix to prevent a leading '#' being
451 interpreted as a directive. */
452 _cpp_clean_line (pfile);
454 pfile->directive = &dtable[dir_no];
455 if (CPP_OPTION (pfile, traditional))
456 prepare_directive_trad (pfile);
457 pfile->directive->handler (pfile);
458 end_directive (pfile, 1);
459 if (dir_no == T_PRAGMA)
460 pfile->buffer->file = NULL;
461 _cpp_pop_buffer (pfile);
464 /* Checks for validity the macro name in #define, #undef, #ifdef and
465 #ifndef directives. */
466 static cpp_hashnode *
467 lex_macro_node (cpp_reader *pfile)
469 const cpp_token *token = _cpp_lex_token (pfile);
471 /* The token immediately after #define must be an identifier. That
472 identifier may not be "defined", per C99 6.10.8p4.
473 In C++, it may not be any of the "named operators" either,
474 per C++98 [lex.digraph], [lex.key].
475 Finally, the identifier may not have been poisoned. (In that case
476 the lexer has issued the error message for us.) */
478 if (token->type == CPP_NAME)
480 cpp_hashnode *node = token->val.node;
482 if (node == pfile->spec_nodes.n_defined)
483 cpp_error (pfile, CPP_DL_ERROR,
484 "\"defined\" cannot be used as a macro name");
485 else if (! (node->flags & NODE_POISONED))
488 else if (token->flags & NAMED_OP)
489 cpp_error (pfile, CPP_DL_ERROR,
490 "\"%s\" cannot be used as a macro name as it is an operator in C++",
491 NODE_NAME (token->val.node));
492 else if (token->type == CPP_EOF)
493 cpp_error (pfile, CPP_DL_ERROR, "no macro name given in #%s directive",
494 pfile->directive->name);
496 cpp_error (pfile, CPP_DL_ERROR, "macro names must be identifiers");
501 /* Process a #define directive. Most work is done in cppmacro.c. */
503 do_define (cpp_reader *pfile)
505 cpp_hashnode *node = lex_macro_node (pfile);
509 /* If we have been requested to expand comments into macros,
510 then re-enable saving of comments. */
511 pfile->state.save_comments =
512 ! CPP_OPTION (pfile, discard_comments_in_macro_exp);
514 if (_cpp_create_definition (pfile, node))
515 if (pfile->cb.define)
516 pfile->cb.define (pfile, pfile->directive_line, node);
520 /* Handle #undef. Mark the identifier NT_VOID in the hash table. */
522 do_undef (cpp_reader *pfile)
524 cpp_hashnode *node = lex_macro_node (pfile);
529 pfile->cb.undef (pfile, pfile->directive_line, node);
531 /* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified
532 identifier is not currently defined as a macro name. */
533 if (node->type == NT_MACRO)
535 if (node->flags & NODE_WARN)
536 cpp_error (pfile, CPP_DL_WARNING,
537 "undefining \"%s\"", NODE_NAME (node));
539 if (CPP_OPTION (pfile, warn_unused_macros))
540 _cpp_warn_if_unused_macro (pfile, node, NULL);
542 _cpp_free_definition (node);
549 /* Undefine a single macro/assertion/whatever. */
552 undefine_macros (cpp_reader *pfile, cpp_hashnode *h,
553 void *data_p ATTRIBUTE_UNUSED)
562 (*pfile->cb.undef) (pfile, pfile->directive_line, h);
564 if (CPP_OPTION (pfile, warn_unused_macros))
565 _cpp_warn_if_unused_macro (pfile, h, NULL);
567 /* And fall through.... */
569 _cpp_free_definition (h);
575 h->flags &= ~NODE_POISONED;
579 /* Undefine all macros and assertions. */
582 cpp_undef_all (cpp_reader *pfile)
584 cpp_forall_identifiers (pfile, undefine_macros, NULL);
588 /* Helper routine used by parse_include. Reinterpret the current line
589 as an h-char-sequence (< ... >); we are looking at the first token
590 after the <. Returns a malloced filename. */
592 glue_header_name (cpp_reader *pfile)
594 const cpp_token *token;
596 size_t len, total_len = 0, capacity = 1024;
598 /* To avoid lexed tokens overwriting our glued name, we can only
599 allocate from the string pool once we've lexed everything. */
600 buffer = xmalloc (capacity);
603 token = get_token_no_padding (pfile);
605 if (token->type == CPP_GREATER)
607 if (token->type == CPP_EOF)
609 cpp_error (pfile, CPP_DL_ERROR, "missing terminating > character");
613 len = cpp_token_len (token) + 2; /* Leading space, terminating \0. */
614 if (total_len + len > capacity)
616 capacity = (capacity + len) * 2;
617 buffer = xrealloc (buffer, capacity);
620 if (token->flags & PREV_WHITE)
621 buffer[total_len++] = ' ';
623 total_len = (cpp_spell_token (pfile, token, (uchar *) &buffer[total_len])
627 buffer[total_len] = '\0';
631 /* Returns the file name of #include, #include_next, #import and
632 #pragma dependency. The string is malloced and the caller should
633 free it. Returns NULL on error. */
635 parse_include (cpp_reader *pfile, int *pangle_brackets)
638 const cpp_token *header;
640 /* Allow macro expansion. */
641 header = get_token_no_padding (pfile);
642 if (header->type == CPP_STRING || header->type == CPP_HEADER_NAME)
644 fname = xmalloc (header->val.str.len - 1);
645 memcpy (fname, header->val.str.text + 1, header->val.str.len - 2);
646 fname[header->val.str.len - 2] = '\0';
647 *pangle_brackets = header->type == CPP_HEADER_NAME;
649 else if (header->type == CPP_LESS)
651 fname = glue_header_name (pfile);
652 *pangle_brackets = 1;
656 const unsigned char *dir;
658 if (pfile->directive == &dtable[T_PRAGMA])
659 dir = U"pragma dependency";
661 dir = pfile->directive->name;
662 cpp_error (pfile, CPP_DL_ERROR, "#%s expects \"FILENAME\" or <FILENAME>",
672 /* Handle #include, #include_next and #import. */
674 do_include_common (cpp_reader *pfile, enum include_type type)
679 fname = parse_include (pfile, &angle_brackets);
683 /* Prevent #include recursion. */
684 if (pfile->line_table->depth >= CPP_STACK_MAX)
685 cpp_error (pfile, CPP_DL_ERROR, "#include nested too deeply");
688 /* Get out of macro context, if we are. */
689 skip_rest_of_line (pfile);
691 if (pfile->cb.include)
692 pfile->cb.include (pfile, pfile->directive_line,
693 pfile->directive->name, fname, angle_brackets);
695 _cpp_stack_include (pfile, fname, angle_brackets, type);
698 free ((void *) fname);
702 do_include (cpp_reader *pfile)
704 do_include_common (pfile, IT_INCLUDE);
708 do_import (cpp_reader *pfile)
710 do_include_common (pfile, IT_IMPORT);
714 do_include_next (cpp_reader *pfile)
716 enum include_type type = IT_INCLUDE_NEXT;
718 /* If this is the primary source file, warn and use the normal
720 if (! pfile->buffer->prev)
722 cpp_error (pfile, CPP_DL_WARNING,
723 "#include_next in primary source file");
726 do_include_common (pfile, type);
729 /* Subroutine of do_linemarker. Read possible flags after file name.
730 LAST is the last flag seen; 0 if this is the first flag. Return the
731 flag if it is valid, 0 at the end of the directive. Otherwise
734 read_flag (cpp_reader *pfile, unsigned int last)
736 const cpp_token *token = _cpp_lex_token (pfile);
738 if (token->type == CPP_NUMBER && token->val.str.len == 1)
740 unsigned int flag = token->val.str.text[0] - '0';
742 if (flag > last && flag <= 4
743 && (flag != 4 || last == 3)
744 && (flag != 2 || last == 0))
748 if (token->type != CPP_EOF)
749 cpp_error (pfile, CPP_DL_ERROR, "invalid flag \"%s\" in line directive",
750 cpp_token_as_text (pfile, token));
754 /* Subroutine of do_line and do_linemarker. Convert a number in STR,
755 of length LEN, to binary; store it in NUMP, and return 0 if the
756 number was well-formed, 1 if not. Temporary, hopefully. */
758 strtoul_for_line (const uchar *str, unsigned int len, long unsigned int *nump)
760 unsigned long reg = 0;
774 /* Interpret #line command.
775 Note that the filename string (if any) is a true string constant
776 (escapes are interpreted), unlike in #line. */
778 do_line (cpp_reader *pfile)
780 const struct line_map *map = linemap_lookup (pfile->line_table, pfile->line);
781 const cpp_token *token;
782 const char *new_file = map->to_file;
783 unsigned long new_lineno;
785 /* C99 raised the minimum limit on #line numbers. */
786 unsigned int cap = CPP_OPTION (pfile, c99) ? 2147483647 : 32767;
788 /* #line commands expand macros. */
789 token = cpp_get_token (pfile);
790 if (token->type != CPP_NUMBER
791 || strtoul_for_line (token->val.str.text, token->val.str.len,
794 cpp_error (pfile, CPP_DL_ERROR,
795 "\"%s\" after #line is not a positive integer",
796 cpp_token_as_text (pfile, token));
800 if (CPP_PEDANTIC (pfile) && (new_lineno == 0 || new_lineno > cap))
801 cpp_error (pfile, CPP_DL_PEDWARN, "line number out of range");
803 token = cpp_get_token (pfile);
804 if (token->type == CPP_STRING)
806 cpp_string s = { 0, 0 };
807 if (cpp_interpret_string_notranslate (pfile, &token->val.str, 1,
809 new_file = (const char *)s.text;
812 else if (token->type != CPP_EOF)
814 cpp_error (pfile, CPP_DL_ERROR, "\"%s\" is not a valid filename",
815 cpp_token_as_text (pfile, token));
819 skip_rest_of_line (pfile);
820 _cpp_do_file_change (pfile, LC_RENAME, new_file, new_lineno,
824 /* Interpret the # 44 "file" [flags] notation, which has slightly
825 different syntax and semantics from #line: Flags are allowed,
826 and we never complain about the line number being too big. */
828 do_linemarker (cpp_reader *pfile)
830 const struct line_map *map = linemap_lookup (pfile->line_table, pfile->line);
831 const cpp_token *token;
832 const char *new_file = map->to_file;
833 unsigned long new_lineno;
834 unsigned int new_sysp = map->sysp;
835 enum lc_reason reason = LC_RENAME;
838 /* Back up so we can get the number again. Putting this in
839 _cpp_handle_directive risks two calls to _cpp_backup_tokens in
840 some circumstances, which can segfault. */
841 _cpp_backup_tokens (pfile, 1);
843 /* #line commands expand macros. */
844 token = cpp_get_token (pfile);
845 if (token->type != CPP_NUMBER
846 || strtoul_for_line (token->val.str.text, token->val.str.len,
849 cpp_error (pfile, CPP_DL_ERROR,
850 "\"%s\" after # is not a positive integer",
851 cpp_token_as_text (pfile, token));
855 token = cpp_get_token (pfile);
856 if (token->type == CPP_STRING)
858 cpp_string s = { 0, 0 };
859 if (cpp_interpret_string_notranslate (pfile, &token->val.str,
861 new_file = (const char *)s.text;
864 flag = read_flag (pfile, 0);
868 /* Fake an include for cpp_included (). */
869 _cpp_fake_include (pfile, new_file);
870 flag = read_flag (pfile, flag);
875 flag = read_flag (pfile, flag);
880 flag = read_flag (pfile, flag);
883 pfile->buffer->sysp = new_sysp;
888 else if (token->type != CPP_EOF)
890 cpp_error (pfile, CPP_DL_ERROR, "\"%s\" is not a valid filename",
891 cpp_token_as_text (pfile, token));
895 skip_rest_of_line (pfile);
896 _cpp_do_file_change (pfile, reason, new_file, new_lineno, new_sysp);
899 /* Arrange the file_change callback. pfile->line has changed to
900 FILE_LINE of TO_FILE, for reason REASON. SYSP is 1 for a system
901 header, 2 for a system header that needs to be extern "C" protected,
902 and zero otherwise. */
904 _cpp_do_file_change (cpp_reader *pfile, enum lc_reason reason,
905 const char *to_file, unsigned int file_line,
908 const struct line_map *map = linemap_add (pfile->line_table, reason, sysp,
913 pfile->line = linemap_line_start (pfile->line_table, map->to_line, 127);
915 if (pfile->cb.file_change)
916 pfile->cb.file_change (pfile, map);
919 /* Report a warning or error detected by the program we are
920 processing. Use the directive's tokens in the error message. */
922 do_diagnostic (cpp_reader *pfile, int code, int print_dir)
924 if (_cpp_begin_message (pfile, code, pfile->cur_token[-1].src_loc, 0))
927 fprintf (stderr, "#%s ", pfile->directive->name);
928 pfile->state.prevent_expansion++;
929 cpp_output_line (pfile, stderr);
930 pfile->state.prevent_expansion--;
935 do_error (cpp_reader *pfile)
937 do_diagnostic (pfile, CPP_DL_ERROR, 1);
941 do_warning (cpp_reader *pfile)
943 /* We want #warning diagnostics to be emitted in system headers too. */
944 do_diagnostic (pfile, CPP_DL_WARNING_SYSHDR, 1);
947 /* Report program identification. */
949 do_ident (cpp_reader *pfile)
951 const cpp_token *str = cpp_get_token (pfile);
953 if (str->type != CPP_STRING)
954 cpp_error (pfile, CPP_DL_ERROR, "invalid #ident directive");
955 else if (pfile->cb.ident)
956 pfile->cb.ident (pfile, pfile->directive_line, &str->val.str);
961 /* Lookup a PRAGMA name in a singly-linked CHAIN. Returns the
962 matching entry, or NULL if none is found. The returned entry could
963 be the start of a namespace chain, or a pragma. */
964 static struct pragma_entry *
965 lookup_pragma_entry (struct pragma_entry *chain, const cpp_hashnode *pragma)
967 while (chain && chain->pragma != pragma)
973 /* Create and insert a pragma entry for NAME at the beginning of a
974 singly-linked CHAIN. If handler is NULL, it is a namespace,
975 otherwise it is a pragma and its handler. */
976 static struct pragma_entry *
977 insert_pragma_entry (cpp_reader *pfile, struct pragma_entry **chain,
978 const cpp_hashnode *pragma, pragma_cb handler)
980 struct pragma_entry *new;
982 new = (struct pragma_entry *)
983 _cpp_aligned_alloc (pfile, sizeof (struct pragma_entry));
984 new->pragma = pragma;
988 new->u.handler = handler;
1001 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1002 goes in the global namespace. HANDLER is the handler it will call,
1003 which must be non-NULL. */
1005 cpp_register_pragma (cpp_reader *pfile, const char *space, const char *name,
1008 struct pragma_entry **chain = &pfile->pragmas;
1009 struct pragma_entry *entry;
1010 const cpp_hashnode *node;
1017 node = cpp_lookup (pfile, U space, strlen (space));
1018 entry = lookup_pragma_entry (*chain, node);
1020 entry = insert_pragma_entry (pfile, chain, node, NULL);
1021 else if (!entry->is_nspace)
1023 chain = &entry->u.space;
1026 /* Check for duplicates. */
1027 node = cpp_lookup (pfile, U name, strlen (name));
1028 entry = lookup_pragma_entry (*chain, node);
1031 if (entry->is_nspace)
1033 cpp_error (pfile, CPP_DL_ICE,
1034 "registering \"%s\" as both a pragma and a pragma namespace",
1037 cpp_error (pfile, CPP_DL_ICE, "#pragma %s %s is already registered",
1040 cpp_error (pfile, CPP_DL_ICE, "#pragma %s is already registered", name);
1043 insert_pragma_entry (pfile, chain, node, handler);
1046 /* Register the pragmas the preprocessor itself handles. */
1048 _cpp_init_internal_pragmas (cpp_reader *pfile)
1050 /* Pragmas in the global namespace. */
1051 cpp_register_pragma (pfile, 0, "once", do_pragma_once);
1053 /* New GCC-specific pragmas should be put in the GCC namespace. */
1054 cpp_register_pragma (pfile, "GCC", "poison", do_pragma_poison);
1055 cpp_register_pragma (pfile, "GCC", "system_header", do_pragma_system_header);
1056 cpp_register_pragma (pfile, "GCC", "dependency", do_pragma_dependency);
1059 /* Return the number of registered pragmas in PE. */
1062 count_registered_pragmas (struct pragma_entry *pe)
1065 for (; pe != NULL; pe = pe->next)
1068 ct += count_registered_pragmas (pe->u.space);
1074 /* Save into SD the names of the registered pragmas referenced by PE,
1075 and return a pointer to the next free space in SD. */
1078 save_registered_pragmas (struct pragma_entry *pe, char **sd)
1080 for (; pe != NULL; pe = pe->next)
1083 sd = save_registered_pragmas (pe->u.space, sd);
1084 *sd++ = xmemdup (HT_STR (&pe->pragma->ident),
1085 HT_LEN (&pe->pragma->ident),
1086 HT_LEN (&pe->pragma->ident) + 1);
1091 /* Return a newly-allocated array which saves the names of the
1092 registered pragmas. */
1095 _cpp_save_pragma_names (cpp_reader *pfile)
1097 int ct = count_registered_pragmas (pfile->pragmas);
1098 char **result = xnewvec (char *, ct);
1099 (void) save_registered_pragmas (pfile->pragmas, result);
1103 /* Restore from SD the names of the registered pragmas referenced by PE,
1104 and return a pointer to the next unused name in SD. */
1107 restore_registered_pragmas (cpp_reader *pfile, struct pragma_entry *pe,
1110 for (; pe != NULL; pe = pe->next)
1113 sd = restore_registered_pragmas (pfile, pe->u.space, sd);
1114 pe->pragma = cpp_lookup (pfile, U *sd, strlen (*sd));
1121 /* Restore the names of the registered pragmas from SAVED. */
1124 _cpp_restore_pragma_names (cpp_reader *pfile, char **saved)
1126 (void) restore_registered_pragmas (pfile, pfile->pragmas, saved);
1130 /* Pragmata handling. We handle some, and pass the rest on to the
1131 front end. C99 defines three pragmas and says that no macro
1132 expansion is to be performed on them; whether or not macro
1133 expansion happens for other pragmas is implementation defined.
1134 This implementation never macro-expands the text after #pragma. */
1136 do_pragma (cpp_reader *pfile)
1138 const struct pragma_entry *p = NULL;
1139 const cpp_token *token, *pragma_token = pfile->cur_token;
1140 unsigned int count = 1;
1142 pfile->state.prevent_expansion++;
1144 token = cpp_get_token (pfile);
1145 if (token->type == CPP_NAME)
1147 p = lookup_pragma_entry (pfile->pragmas, token->val.node);
1148 if (p && p->is_nspace)
1151 token = cpp_get_token (pfile);
1152 if (token->type == CPP_NAME)
1153 p = lookup_pragma_entry (p->u.space, token->val.node);
1161 /* Since the handler below doesn't get the line number, that it
1162 might need for diagnostics, make sure it has the right
1163 numbers in place. */
1164 if (pfile->cb.line_change)
1165 (*pfile->cb.line_change) (pfile, pragma_token, false);
1166 (*p->u.handler) (pfile);
1167 if (pfile->cb.line_change)
1168 (*pfile->cb.line_change) (pfile, pfile->cur_token, false);
1171 else if (pfile->cb.def_pragma)
1173 _cpp_backup_tokens (pfile, count);
1174 pfile->cb.def_pragma (pfile, pfile->directive_line);
1177 pfile->state.prevent_expansion--;
1180 /* Handle #pragma once. */
1182 do_pragma_once (cpp_reader *pfile)
1184 if (pfile->buffer->prev == NULL)
1185 cpp_error (pfile, CPP_DL_WARNING, "#pragma once in main file");
1188 _cpp_mark_file_once_only (pfile, pfile->buffer->file);
1191 /* Handle #pragma GCC poison, to poison one or more identifiers so
1192 that the lexer produces a hard error for each subsequent usage. */
1194 do_pragma_poison (cpp_reader *pfile)
1196 const cpp_token *tok;
1199 pfile->state.poisoned_ok = 1;
1202 tok = _cpp_lex_token (pfile);
1203 if (tok->type == CPP_EOF)
1205 if (tok->type != CPP_NAME)
1207 cpp_error (pfile, CPP_DL_ERROR,
1208 "invalid #pragma GCC poison directive");
1213 if (hp->flags & NODE_POISONED)
1216 if (hp->type == NT_MACRO)
1217 cpp_error (pfile, CPP_DL_WARNING, "poisoning existing macro \"%s\"",
1219 _cpp_free_definition (hp);
1220 hp->flags |= NODE_POISONED | NODE_DIAGNOSTIC;
1222 pfile->state.poisoned_ok = 0;
1225 /* Mark the current header as a system header. This will suppress
1226 some categories of warnings (notably those from -pedantic). It is
1227 intended for use in system libraries that cannot be implemented in
1228 conforming C, but cannot be certain that their headers appear in a
1229 system include directory. To prevent abuse, it is rejected in the
1230 primary source file. */
1232 do_pragma_system_header (cpp_reader *pfile)
1234 cpp_buffer *buffer = pfile->buffer;
1236 if (buffer->prev == 0)
1237 cpp_error (pfile, CPP_DL_WARNING,
1238 "#pragma system_header ignored outside include file");
1242 skip_rest_of_line (pfile);
1243 cpp_make_system_header (pfile, 1, 0);
1247 /* Check the modified date of the current include file against a specified
1248 file. Issue a diagnostic, if the specified file is newer. We use this to
1249 determine if a fixed header should be refixed. */
1251 do_pragma_dependency (cpp_reader *pfile)
1254 int angle_brackets, ordering;
1256 fname = parse_include (pfile, &angle_brackets);
1260 ordering = _cpp_compare_file_date (pfile, fname, angle_brackets);
1262 cpp_error (pfile, CPP_DL_WARNING, "cannot find source file %s", fname);
1263 else if (ordering > 0)
1265 cpp_error (pfile, CPP_DL_WARNING,
1266 "current file is older than %s", fname);
1267 if (cpp_get_token (pfile)->type != CPP_EOF)
1269 _cpp_backup_tokens (pfile, 1);
1270 do_diagnostic (pfile, CPP_DL_WARNING, 0);
1274 free ((void *) fname);
1277 /* Get a token but skip padding. */
1278 static const cpp_token *
1279 get_token_no_padding (cpp_reader *pfile)
1283 const cpp_token *result = cpp_get_token (pfile);
1284 if (result->type != CPP_PADDING)
1289 /* Check syntax is "(string-literal)". Returns the string on success,
1290 or NULL on failure. */
1291 static const cpp_token *
1292 get__Pragma_string (cpp_reader *pfile)
1294 const cpp_token *string;
1296 if (get_token_no_padding (pfile)->type != CPP_OPEN_PAREN)
1299 string = get_token_no_padding (pfile);
1300 if (string->type != CPP_STRING && string->type != CPP_WSTRING)
1303 if (get_token_no_padding (pfile)->type != CPP_CLOSE_PAREN)
1309 /* Destringize IN into a temporary buffer, by removing the first \ of
1310 \" and \\ sequences, and process the result as a #pragma directive. */
1312 destringize_and_run (cpp_reader *pfile, const cpp_string *in)
1314 const unsigned char *src, *limit;
1315 char *dest, *result;
1317 dest = result = alloca (in->len - 1);
1318 src = in->text + 1 + (in->text[0] == 'L');
1319 limit = in->text + in->len - 1;
1322 /* We know there is a character following the backslash. */
1323 if (*src == '\\' && (src[1] == '\\' || src[1] == '"'))
1329 /* Ugh; an awful kludge. We are really not set up to be lexing
1330 tokens when in the middle of a macro expansion. Use a new
1331 context to force cpp_get_token to lex, and so skip_rest_of_line
1332 doesn't go beyond the end of the text. Also, remember the
1333 current lexing position so we can return to it later.
1335 Something like line-at-a-time lexing should remove the need for
1338 cpp_context *saved_context = pfile->context;
1339 cpp_token *saved_cur_token = pfile->cur_token;
1340 tokenrun *saved_cur_run = pfile->cur_run;
1342 pfile->context = xnew (cpp_context);
1343 pfile->context->macro = 0;
1344 pfile->context->prev = 0;
1345 run_directive (pfile, T_PRAGMA, result, dest - result);
1346 free (pfile->context);
1347 pfile->context = saved_context;
1348 pfile->cur_token = saved_cur_token;
1349 pfile->cur_run = saved_cur_run;
1352 /* See above comment. For the moment, we'd like
1354 token1 _Pragma ("foo") token2
1364 Getting the line markers is a little tricky. */
1365 if (pfile->cb.line_change)
1366 pfile->cb.line_change (pfile, pfile->cur_token, false);
1369 /* Handle the _Pragma operator. */
1371 _cpp_do__Pragma (cpp_reader *pfile)
1373 const cpp_token *string = get__Pragma_string (pfile);
1376 destringize_and_run (pfile, &string->val.str);
1378 cpp_error (pfile, CPP_DL_ERROR,
1379 "_Pragma takes a parenthesized string literal");
1382 /* Ignore #sccs on all systems. */
1384 do_sccs (cpp_reader *pfile ATTRIBUTE_UNUSED)
1388 /* Handle #ifdef. */
1390 do_ifdef (cpp_reader *pfile)
1394 if (! pfile->state.skipping)
1396 const cpp_hashnode *node = lex_macro_node (pfile);
1400 skip = node->type != NT_MACRO;
1401 _cpp_mark_macro_used (node);
1406 push_conditional (pfile, skip, T_IFDEF, 0);
1409 /* Handle #ifndef. */
1411 do_ifndef (cpp_reader *pfile)
1414 const cpp_hashnode *node = 0;
1416 if (! pfile->state.skipping)
1418 node = lex_macro_node (pfile);
1422 skip = node->type == NT_MACRO;
1423 _cpp_mark_macro_used (node);
1428 push_conditional (pfile, skip, T_IFNDEF, node);
1431 /* _cpp_parse_expr puts a macro in a "#if !defined ()" expression in
1432 pfile->mi_ind_cmacro so we can handle multiple-include
1433 optimizations. If macro expansion occurs in the expression, we
1434 cannot treat it as a controlling conditional, since the expansion
1435 could change in the future. That is handled by cpp_get_token. */
1437 do_if (cpp_reader *pfile)
1441 if (! pfile->state.skipping)
1442 skip = _cpp_parse_expr (pfile) == false;
1444 push_conditional (pfile, skip, T_IF, pfile->mi_ind_cmacro);
1447 /* Flip skipping state if appropriate and continue without changing
1448 if_stack; this is so that the error message for missing #endif's
1449 etc. will point to the original #if. */
1451 do_else (cpp_reader *pfile)
1453 cpp_buffer *buffer = pfile->buffer;
1454 struct if_stack *ifs = buffer->if_stack;
1457 cpp_error (pfile, CPP_DL_ERROR, "#else without #if");
1460 if (ifs->type == T_ELSE)
1462 cpp_error (pfile, CPP_DL_ERROR, "#else after #else");
1463 cpp_error_with_line (pfile, CPP_DL_ERROR, ifs->line, 0,
1464 "the conditional began here");
1468 /* Skip any future (erroneous) #elses or #elifs. */
1469 pfile->state.skipping = ifs->skip_elses;
1470 ifs->skip_elses = true;
1472 /* Invalidate any controlling macro. */
1475 /* Only check EOL if was not originally skipping. */
1476 if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels))
1481 /* Handle a #elif directive by not changing if_stack either. See the
1482 comment above do_else. */
1484 do_elif (cpp_reader *pfile)
1486 cpp_buffer *buffer = pfile->buffer;
1487 struct if_stack *ifs = buffer->if_stack;
1490 cpp_error (pfile, CPP_DL_ERROR, "#elif without #if");
1493 if (ifs->type == T_ELSE)
1495 cpp_error (pfile, CPP_DL_ERROR, "#elif after #else");
1496 cpp_error_with_line (pfile, CPP_DL_ERROR, ifs->line, 0,
1497 "the conditional began here");
1501 /* Only evaluate this if we aren't skipping elses. During
1502 evaluation, set skipping to false to get lexer warnings. */
1503 if (ifs->skip_elses)
1504 pfile->state.skipping = 1;
1507 pfile->state.skipping = 0;
1508 pfile->state.skipping = ! _cpp_parse_expr (pfile);
1509 ifs->skip_elses = ! pfile->state.skipping;
1512 /* Invalidate any controlling macro. */
1517 /* #endif pops the if stack and resets pfile->state.skipping. */
1519 do_endif (cpp_reader *pfile)
1521 cpp_buffer *buffer = pfile->buffer;
1522 struct if_stack *ifs = buffer->if_stack;
1525 cpp_error (pfile, CPP_DL_ERROR, "#endif without #if");
1528 /* Only check EOL if was not originally skipping. */
1529 if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels))
1532 /* If potential control macro, we go back outside again. */
1533 if (ifs->next == 0 && ifs->mi_cmacro)
1535 pfile->mi_valid = true;
1536 pfile->mi_cmacro = ifs->mi_cmacro;
1539 buffer->if_stack = ifs->next;
1540 pfile->state.skipping = ifs->was_skipping;
1541 obstack_free (&pfile->buffer_ob, ifs);
1545 /* Push an if_stack entry for a preprocessor conditional, and set
1546 pfile->state.skipping to SKIP. If TYPE indicates the conditional
1547 is #if or #ifndef, CMACRO is a potentially controlling macro, and
1548 we need to check here that we are at the top of the file. */
1550 push_conditional (cpp_reader *pfile, int skip, int type,
1551 const cpp_hashnode *cmacro)
1553 struct if_stack *ifs;
1554 cpp_buffer *buffer = pfile->buffer;
1556 ifs = xobnew (&pfile->buffer_ob, struct if_stack);
1557 ifs->line = pfile->directive_line;
1558 ifs->next = buffer->if_stack;
1559 ifs->skip_elses = pfile->state.skipping || !skip;
1560 ifs->was_skipping = pfile->state.skipping;
1562 /* This condition is effectively a test for top-of-file. */
1563 if (pfile->mi_valid && pfile->mi_cmacro == 0)
1564 ifs->mi_cmacro = cmacro;
1568 pfile->state.skipping = skip;
1569 buffer->if_stack = ifs;
1572 /* Read the tokens of the answer into the macro pool, in a directive
1573 of type TYPE. Only commit the memory if we intend it as permanent
1574 storage, i.e. the #assert case. Returns 0 on success, and sets
1575 ANSWERP to point to the answer. */
1577 parse_answer (cpp_reader *pfile, struct answer **answerp, int type)
1579 const cpp_token *paren;
1580 struct answer *answer;
1581 unsigned int acount;
1583 /* In a conditional, it is legal to not have an open paren. We
1584 should save the following token in this case. */
1585 paren = cpp_get_token (pfile);
1587 /* If not a paren, see if we're OK. */
1588 if (paren->type != CPP_OPEN_PAREN)
1590 /* In a conditional no answer is a test for any answer. It
1591 could be followed by any token. */
1594 _cpp_backup_tokens (pfile, 1);
1598 /* #unassert with no answer is valid - it removes all answers. */
1599 if (type == T_UNASSERT && paren->type == CPP_EOF)
1602 cpp_error (pfile, CPP_DL_ERROR, "missing '(' after predicate");
1606 for (acount = 0;; acount++)
1609 const cpp_token *token = cpp_get_token (pfile);
1612 if (token->type == CPP_CLOSE_PAREN)
1615 if (token->type == CPP_EOF)
1617 cpp_error (pfile, CPP_DL_ERROR, "missing ')' to complete answer");
1621 /* struct answer includes the space for one token. */
1622 room_needed = (sizeof (struct answer) + acount * sizeof (cpp_token));
1624 if (BUFF_ROOM (pfile->a_buff) < room_needed)
1625 _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (struct answer));
1627 dest = &((struct answer *) BUFF_FRONT (pfile->a_buff))->first[acount];
1630 /* Drop whitespace at start, for answer equivalence purposes. */
1632 dest->flags &= ~PREV_WHITE;
1637 cpp_error (pfile, CPP_DL_ERROR, "predicate's answer is empty");
1641 answer = (struct answer *) BUFF_FRONT (pfile->a_buff);
1642 answer->count = acount;
1643 answer->next = NULL;
1649 /* Parses an assertion directive of type TYPE, returning a pointer to
1650 the hash node of the predicate, or 0 on error. If an answer was
1651 supplied, it is placed in ANSWERP, otherwise it is set to 0. */
1652 static cpp_hashnode *
1653 parse_assertion (cpp_reader *pfile, struct answer **answerp, int type)
1655 cpp_hashnode *result = 0;
1656 const cpp_token *predicate;
1658 /* We don't expand predicates or answers. */
1659 pfile->state.prevent_expansion++;
1662 predicate = cpp_get_token (pfile);
1663 if (predicate->type == CPP_EOF)
1664 cpp_error (pfile, CPP_DL_ERROR, "assertion without predicate");
1665 else if (predicate->type != CPP_NAME)
1666 cpp_error (pfile, CPP_DL_ERROR, "predicate must be an identifier");
1667 else if (parse_answer (pfile, answerp, type) == 0)
1669 unsigned int len = NODE_LEN (predicate->val.node);
1670 unsigned char *sym = alloca (len + 1);
1672 /* Prefix '#' to get it out of macro namespace. */
1674 memcpy (sym + 1, NODE_NAME (predicate->val.node), len);
1675 result = cpp_lookup (pfile, sym, len + 1);
1678 pfile->state.prevent_expansion--;
1682 /* Returns a pointer to the pointer to CANDIDATE in the answer chain,
1683 or a pointer to NULL if the answer is not in the chain. */
1684 static struct answer **
1685 find_answer (cpp_hashnode *node, const struct answer *candidate)
1688 struct answer **result;
1690 for (result = &node->value.answers; *result; result = &(*result)->next)
1692 struct answer *answer = *result;
1694 if (answer->count == candidate->count)
1696 for (i = 0; i < answer->count; i++)
1697 if (! _cpp_equiv_tokens (&answer->first[i], &candidate->first[i]))
1700 if (i == answer->count)
1708 /* Test an assertion within a preprocessor conditional. Returns
1709 nonzero on failure, zero on success. On success, the result of
1710 the test is written into VALUE, otherwise the value 0. */
1712 _cpp_test_assertion (cpp_reader *pfile, unsigned int *value)
1714 struct answer *answer;
1717 node = parse_assertion (pfile, &answer, T_IF);
1719 /* For recovery, an erroneous assertion expression is handled as a
1720 failing assertion. */
1724 *value = (node->type == NT_ASSERTION &&
1725 (answer == 0 || *find_answer (node, answer) != 0));
1726 else if (pfile->cur_token[-1].type == CPP_EOF)
1727 _cpp_backup_tokens (pfile, 1);
1729 /* We don't commit the memory for the answer - it's temporary only. */
1733 /* Handle #assert. */
1735 do_assert (cpp_reader *pfile)
1737 struct answer *new_answer;
1740 node = parse_assertion (pfile, &new_answer, T_ASSERT);
1743 /* Place the new answer in the answer list. First check there
1744 is not a duplicate. */
1745 new_answer->next = 0;
1746 if (node->type == NT_ASSERTION)
1748 if (*find_answer (node, new_answer))
1750 cpp_error (pfile, CPP_DL_WARNING, "\"%s\" re-asserted",
1751 NODE_NAME (node) + 1);
1754 new_answer->next = node->value.answers;
1757 node->type = NT_ASSERTION;
1758 node->value.answers = new_answer;
1759 BUFF_FRONT (pfile->a_buff) += (sizeof (struct answer)
1760 + (new_answer->count - 1)
1761 * sizeof (cpp_token));
1766 /* Handle #unassert. */
1768 do_unassert (cpp_reader *pfile)
1771 struct answer *answer;
1773 node = parse_assertion (pfile, &answer, T_UNASSERT);
1774 /* It isn't an error to #unassert something that isn't asserted. */
1775 if (node && node->type == NT_ASSERTION)
1779 struct answer **p = find_answer (node, answer), *temp;
1781 /* Remove the answer from the list. */
1786 /* Did we free the last answer? */
1787 if (node->value.answers == 0)
1788 node->type = NT_VOID;
1793 _cpp_free_definition (node);
1796 /* We don't commit the memory for the answer - it's temporary only. */
1799 /* These are for -D, -U, -A. */
1801 /* Process the string STR as if it appeared as the body of a #define.
1802 If STR is just an identifier, define it with value 1.
1803 If STR has anything after the identifier, then it should
1804 be identifier=definition. */
1806 cpp_define (cpp_reader *pfile, const char *str)
1811 /* Copy the entire option so we can modify it.
1812 Change the first "=" in the string to a space. If there is none,
1813 tack " 1" on the end. */
1815 count = strlen (str);
1816 buf = alloca (count + 3);
1817 memcpy (buf, str, count);
1819 p = strchr (str, '=');
1829 run_directive (pfile, T_DEFINE, buf, count);
1832 /* Slight variant of the above for use by initialize_builtins. */
1834 _cpp_define_builtin (cpp_reader *pfile, const char *str)
1836 size_t len = strlen (str);
1837 char *buf = alloca (len + 1);
1838 memcpy (buf, str, len);
1840 run_directive (pfile, T_DEFINE, buf, len);
1843 /* Process MACRO as if it appeared as the body of an #undef. */
1845 cpp_undef (cpp_reader *pfile, const char *macro)
1847 size_t len = strlen (macro);
1848 char *buf = alloca (len + 1);
1849 memcpy (buf, macro, len);
1851 run_directive (pfile, T_UNDEF, buf, len);
1854 /* Process the string STR as if it appeared as the body of a #assert. */
1856 cpp_assert (cpp_reader *pfile, const char *str)
1858 handle_assertion (pfile, str, T_ASSERT);
1861 /* Process STR as if it appeared as the body of an #unassert. */
1863 cpp_unassert (cpp_reader *pfile, const char *str)
1865 handle_assertion (pfile, str, T_UNASSERT);
1868 /* Common code for cpp_assert (-A) and cpp_unassert (-A-). */
1870 handle_assertion (cpp_reader *pfile, const char *str, int type)
1872 size_t count = strlen (str);
1873 const char *p = strchr (str, '=');
1875 /* Copy the entire option so we can modify it. Change the first
1876 "=" in the string to a '(', and tack a ')' on the end. */
1877 char *buf = alloca (count + 2);
1879 memcpy (buf, str, count);
1888 run_directive (pfile, type, str, count);
1891 /* The number of errors for a given reader. */
1893 cpp_errors (cpp_reader *pfile)
1895 return pfile->errors;
1898 /* The options structure. */
1900 cpp_get_options (cpp_reader *pfile)
1902 return &pfile->opts;
1905 /* The callbacks structure. */
1907 cpp_get_callbacks (cpp_reader *pfile)
1912 /* Copy the given callbacks structure to our own. */
1914 cpp_set_callbacks (cpp_reader *pfile, cpp_callbacks *cb)
1919 /* Push a new buffer on the buffer stack. Returns the new buffer; it
1920 doesn't fail. It does not generate a file change call back; that
1921 is the responsibility of the caller. */
1923 cpp_push_buffer (cpp_reader *pfile, const uchar *buffer, size_t len,
1926 cpp_buffer *new = xobnew (&pfile->buffer_ob, cpp_buffer);
1928 /* Clears, amongst other things, if_stack and mi_cmacro. */
1929 memset (new, 0, sizeof (cpp_buffer));
1931 new->next_line = new->buf = buffer;
1932 new->rlimit = buffer + len;
1933 new->from_stage3 = from_stage3;
1934 new->prev = pfile->buffer;
1935 new->need_line = true;
1937 pfile->buffer = new;
1942 /* Pops a single buffer, with a file change call-back if appropriate.
1943 Then pushes the next -include file, if any remain. */
1945 _cpp_pop_buffer (cpp_reader *pfile)
1947 cpp_buffer *buffer = pfile->buffer;
1948 struct _cpp_file *inc = buffer->file;
1949 struct if_stack *ifs;
1951 /* Walk back up the conditional stack till we reach its level at
1952 entry to this file, issuing error messages. */
1953 for (ifs = buffer->if_stack; ifs; ifs = ifs->next)
1954 cpp_error_with_line (pfile, CPP_DL_ERROR, ifs->line, 0,
1955 "unterminated #%s", dtable[ifs->type].name);
1957 /* In case of a missing #endif. */
1958 pfile->state.skipping = 0;
1960 /* _cpp_do_file_change expects pfile->buffer to be the new one. */
1961 pfile->buffer = buffer->prev;
1963 free (buffer->notes);
1965 /* Free the buffer object now; we may want to push a new buffer
1966 in _cpp_push_next_include_file. */
1967 obstack_free (&pfile->buffer_ob, buffer);
1971 _cpp_pop_file_buffer (pfile, inc);
1973 _cpp_do_file_change (pfile, LC_LEAVE, 0, 0, 0);
1977 /* Enter all recognized directives in the hash table. */
1979 _cpp_init_directives (cpp_reader *pfile)
1984 for (i = 0; i < (unsigned int) N_DIRECTIVES; i++)
1986 node = cpp_lookup (pfile, dtable[i].name, dtable[i].length);
1987 node->is_directive = 1;
1988 node->directive_index = i;