1 /* CPP Library. (Directive handling.)
2 Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001, 2002 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. */
29 /* Chained list of answers to an assertion. */
37 /* Stack of conditionals currently in progress
38 (including both successful and failing conditionals). */
41 struct if_stack *next;
42 unsigned int line; /* Line where condition started. */
43 const cpp_hashnode *mi_cmacro;/* macro name for #ifndef around entire file */
44 bool skip_elses; /* Can future #else / #elif be skipped? */
45 bool was_skipping; /* If were skipping on entry. */
46 int type; /* Most recent conditional, for diagnostics. */
49 /* Contains a registered pragma or pragma namespace. */
50 typedef void (*pragma_cb) PARAMS ((cpp_reader *));
53 struct pragma_entry *next;
54 const cpp_hashnode *pragma; /* Name and length. */
58 struct pragma_entry *space;
62 /* Values for the origin field of struct directive. KANDR directives
63 come from traditional (K&R) C. STDC89 directives come from the
64 1989 C standard. EXTENSION directives are extensions. */
69 /* Values for the flags field of struct directive. COND indicates a
70 conditional; IF_COND an opening conditional. INCL means to treat
71 "..." and <...> as q-char and h-char sequences respectively. IN_I
72 means this directive should be handled even if -fpreprocessed is in
73 effect (these are the directives with callback hooks).
75 EXPAND is set on directives that are always macro-expanded. */
77 #define IF_COND (1 << 1)
80 #define EXPAND (1 << 4)
82 /* Defines one #-directive, including how to handle it. */
83 typedef void (*directive_handler) PARAMS ((cpp_reader *));
84 typedef struct directive directive;
87 directive_handler handler; /* Function to handle directive. */
88 const uchar *name; /* Name of directive. */
89 unsigned short length; /* Length of name. */
90 unsigned char origin; /* Origin of directive. */
91 unsigned char flags; /* Flags describing this directive. */
94 /* Forward declarations. */
96 static void skip_rest_of_line PARAMS ((cpp_reader *));
97 static void check_eol PARAMS ((cpp_reader *));
98 static void start_directive PARAMS ((cpp_reader *));
99 static void prepare_directive_trad PARAMS ((cpp_reader *));
100 static void end_directive PARAMS ((cpp_reader *, int));
101 static void directive_diagnostics
102 PARAMS ((cpp_reader *, const directive *, int));
103 static void run_directive PARAMS ((cpp_reader *, int,
104 const char *, size_t));
105 static const cpp_token *glue_header_name PARAMS ((cpp_reader *));
106 static const cpp_token *parse_include PARAMS ((cpp_reader *));
107 static void push_conditional PARAMS ((cpp_reader *, int, int,
108 const cpp_hashnode *));
109 static unsigned int read_flag PARAMS ((cpp_reader *, unsigned int));
110 static uchar *dequote_string PARAMS ((cpp_reader *, const uchar *,
112 static int strtoul_for_line PARAMS ((const uchar *, unsigned int,
114 static void do_diagnostic PARAMS ((cpp_reader *, int, int));
115 static cpp_hashnode *lex_macro_node PARAMS ((cpp_reader *));
116 static void do_include_common PARAMS ((cpp_reader *, enum include_type));
117 static struct pragma_entry *lookup_pragma_entry
118 PARAMS ((struct pragma_entry *, const cpp_hashnode *pragma));
119 static struct pragma_entry *insert_pragma_entry
120 PARAMS ((cpp_reader *, struct pragma_entry **, const cpp_hashnode *,
122 static void do_pragma_once PARAMS ((cpp_reader *));
123 static void do_pragma_poison PARAMS ((cpp_reader *));
124 static void do_pragma_system_header PARAMS ((cpp_reader *));
125 static void do_pragma_dependency PARAMS ((cpp_reader *));
126 static void do_linemarker PARAMS ((cpp_reader *));
127 static const cpp_token *get_token_no_padding PARAMS ((cpp_reader *));
128 static const cpp_token *get__Pragma_string PARAMS ((cpp_reader *));
129 static void destringize_and_run PARAMS ((cpp_reader *, const cpp_string *));
130 static int parse_answer PARAMS ((cpp_reader *, struct answer **, int));
131 static cpp_hashnode *parse_assertion PARAMS ((cpp_reader *, struct answer **,
133 static struct answer ** find_answer PARAMS ((cpp_hashnode *,
134 const struct answer *));
135 static void handle_assertion PARAMS ((cpp_reader *, const char *, int));
137 /* This is the table of directive handlers. It is ordered by
138 frequency of occurrence; the numbers at the end are directive
139 counts from all the source code I have lying around (egcs and libc
140 CVS as of 1999-05-18, plus grub-0.5.91, linux-2.2.9, and
141 pcmcia-cs-3.0.9). This is no longer important as directive lookup
142 is now O(1). All extensions other than #warning and #include_next
143 are deprecated. The name is where the extension appears to have
146 #define DIRECTIVE_TABLE \
147 D(define, T_DEFINE = 0, KANDR, IN_I) /* 270554 */ \
148 D(include, T_INCLUDE, KANDR, INCL | EXPAND) /* 52262 */ \
149 D(endif, T_ENDIF, KANDR, COND) /* 45855 */ \
150 D(ifdef, T_IFDEF, KANDR, COND | IF_COND) /* 22000 */ \
151 D(if, T_IF, KANDR, COND | IF_COND | EXPAND) /* 18162 */ \
152 D(else, T_ELSE, KANDR, COND) /* 9863 */ \
153 D(ifndef, T_IFNDEF, KANDR, COND | IF_COND) /* 9675 */ \
154 D(undef, T_UNDEF, KANDR, IN_I) /* 4837 */ \
155 D(line, T_LINE, KANDR, EXPAND) /* 2465 */ \
156 D(elif, T_ELIF, STDC89, COND | EXPAND) /* 610 */ \
157 D(error, T_ERROR, STDC89, 0) /* 475 */ \
158 D(pragma, T_PRAGMA, STDC89, IN_I) /* 195 */ \
159 D(warning, T_WARNING, EXTENSION, 0) /* 22 */ \
160 D(include_next, T_INCLUDE_NEXT, EXTENSION, INCL | EXPAND) /* 19 */ \
161 D(ident, T_IDENT, EXTENSION, IN_I) /* 11 */ \
162 D(import, T_IMPORT, EXTENSION, INCL | EXPAND) /* 0 ObjC */ \
163 D(assert, T_ASSERT, EXTENSION, 0) /* 0 SVR4 */ \
164 D(unassert, T_UNASSERT, EXTENSION, 0) /* 0 SVR4 */ \
165 D(sccs, T_SCCS, EXTENSION, 0) /* 0 SVR4? */
167 /* Use the table to generate a series of prototypes, an enum for the
168 directive names, and an array of directive handlers. */
170 /* Don't invoke CONCAT2 with any whitespace or K&R cc will fail. */
171 #define D(name, t, o, f) static void CONCAT2(do_,name) PARAMS ((cpp_reader *));
175 #define D(n, tag, o, f) tag,
183 /* Don't invoke CONCAT2 with any whitespace or K&R cc will fail. */
184 #define D(name, t, origin, flags) \
185 { CONCAT2(do_,name), (const uchar *) STRINGX(name), \
186 sizeof STRINGX(name) - 1, origin, flags },
187 static const directive dtable[] =
192 #undef DIRECTIVE_TABLE
194 /* Wrapper struct directive for linemarkers.
195 The origin is more or less true - the original K+R cpp
196 did use this notation in its preprocessed output. */
197 static const directive linemarker_dir =
199 do_linemarker, U"#", 1, KANDR, IN_I
202 #define SEEN_EOL() (pfile->cur_token[-1].type == CPP_EOF)
204 /* Skip any remaining tokens in a directive. */
206 skip_rest_of_line (pfile)
209 /* Discard all stacked contexts. */
210 while (pfile->context != &pfile->base_context)
211 _cpp_pop_context (pfile);
213 /* Sweep up all tokens remaining on the line. */
215 while (_cpp_lex_token (pfile)->type != CPP_EOF)
219 /* Ensure there are no stray tokens at the end of a directive. */
224 if (! SEEN_EOL () && _cpp_lex_token (pfile)->type != CPP_EOF)
225 cpp_error (pfile, DL_PEDWARN, "extra tokens at end of #%s directive",
226 pfile->directive->name);
229 /* Called when entering a directive, _Pragma or command-line directive. */
231 start_directive (pfile)
234 /* Setup in-directive state. */
235 pfile->state.in_directive = 1;
236 pfile->state.save_comments = 0;
238 /* Some handlers need the position of the # for diagnostics. */
239 pfile->directive_line = pfile->line;
242 /* Called when leaving a directive, _Pragma or command-line directive. */
244 end_directive (pfile, skip_line)
248 if (CPP_OPTION (pfile, traditional))
250 /* Revert change of prepare_directive_trad. */
251 pfile->state.prevent_expansion--;
253 if (pfile->directive != &dtable[T_DEFINE])
254 _cpp_remove_overlay (pfile);
256 /* We don't skip for an assembler #. */
259 skip_rest_of_line (pfile);
260 if (!pfile->keep_tokens)
262 pfile->cur_run = &pfile->base_run;
263 pfile->cur_token = pfile->base_run.base;
268 pfile->state.save_comments = ! CPP_OPTION (pfile, discard_comments);
269 pfile->state.in_directive = 0;
270 pfile->state.in_expression = 0;
271 pfile->state.angled_headers = 0;
272 pfile->directive = 0;
275 /* Prepare to handle the directive in pfile->directive. */
277 prepare_directive_trad (pfile)
280 if (pfile->directive != &dtable[T_DEFINE])
282 bool no_expand = (pfile->directive
283 && ! (pfile->directive->flags & EXPAND));
284 bool was_skipping = pfile->state.skipping;
286 pfile->state.skipping = false;
287 pfile->state.in_expression = (pfile->directive == &dtable[T_IF]
288 || pfile->directive == &dtable[T_ELIF]);
290 pfile->state.prevent_expansion++;
291 _cpp_read_logical_line_trad (pfile);
293 pfile->state.prevent_expansion--;
294 pfile->state.skipping = was_skipping;
295 _cpp_overlay_buffer (pfile, pfile->out.base,
296 pfile->out.cur - pfile->out.base);
299 /* Stop ISO C from expanding anything. */
300 pfile->state.prevent_expansion++;
303 /* Output diagnostics for a directive DIR. INDENTED is non-zero if
304 the '#' was indented. */
306 directive_diagnostics (pfile, dir, indented)
308 const directive *dir;
311 /* Issue -pedantic warnings for extensions. */
312 if (CPP_PEDANTIC (pfile)
313 && ! pfile->state.skipping
314 && dir->origin == EXTENSION)
315 cpp_error (pfile, DL_PEDWARN, "#%s is a GCC extension", dir->name);
317 /* Traditionally, a directive is ignored unless its # is in
318 column 1. Therefore in code intended to work with K+R
319 compilers, directives added by C89 must have their #
320 indented, and directives present in traditional C must not.
321 This is true even of directives in skipped conditional
322 blocks. #elif cannot be used at all. */
323 if (CPP_WTRADITIONAL (pfile))
325 if (dir == &dtable[T_ELIF])
326 cpp_error (pfile, DL_WARNING,
327 "suggest not using #elif in traditional C");
328 else if (indented && dir->origin == KANDR)
329 cpp_error (pfile, DL_WARNING,
330 "traditional C ignores #%s with the # indented",
332 else if (!indented && dir->origin != KANDR)
333 cpp_error (pfile, DL_WARNING,
334 "suggest hiding #%s from traditional C with an indented #",
339 /* Check if we have a known directive. INDENTED is non-zero if the
340 '#' of the directive was indented. This function is in this file
341 to save unnecessarily exporting dtable etc. to cpplex.c. Returns
342 non-zero if the line of tokens has been handled, zero if we should
343 continue processing the line. */
345 _cpp_handle_directive (pfile, indented)
349 const directive *dir = 0;
350 const cpp_token *dname;
351 bool was_parsing_args = pfile->state.parsing_args;
354 if (was_parsing_args)
356 if (CPP_OPTION (pfile, pedantic))
357 cpp_error (pfile, DL_PEDWARN,
358 "embedding a directive within macro arguments is not portable");
359 pfile->state.parsing_args = 0;
360 pfile->state.prevent_expansion = 0;
362 start_directive (pfile);
363 dname = _cpp_lex_token (pfile);
365 if (dname->type == CPP_NAME)
367 if (dname->val.node->directive_index)
368 dir = &dtable[dname->val.node->directive_index - 1];
370 /* We do not recognise the # followed by a number extension in
372 else if (dname->type == CPP_NUMBER && CPP_OPTION (pfile, lang) != CLK_ASM)
374 dir = &linemarker_dir;
375 if (CPP_PEDANTIC (pfile) && ! CPP_OPTION (pfile, preprocessed)
376 && ! pfile->state.skipping)
377 cpp_error (pfile, DL_PEDWARN,
378 "style of line directive is a GCC extension");
383 /* If we have a directive that is not an opening conditional,
384 invalidate any control macro. */
385 if (! (dir->flags & IF_COND))
386 pfile->mi_valid = false;
388 /* Kluge alert. In order to be sure that code like this
393 does not cause '#define foo bar' to get executed when
394 compiled with -save-temps, we recognize directives in
395 -fpreprocessed mode only if the # is in column 1. cppmacro.c
396 puts a space in front of any '#' at the start of a macro. */
397 if (CPP_OPTION (pfile, preprocessed)
398 && (indented || !(dir->flags & IN_I)))
405 /* In failed conditional groups, all non-conditional
406 directives are ignored. Before doing that, whether
407 skipping or not, we should lex angle-bracketed headers
408 correctly, and maybe output some diagnostics. */
409 pfile->state.angled_headers = dir->flags & INCL;
410 if (! CPP_OPTION (pfile, preprocessed))
411 directive_diagnostics (pfile, dir, indented);
412 if (pfile->state.skipping && !(dir->flags & COND))
416 else if (dname->type == CPP_EOF)
417 ; /* CPP_EOF is the "null directive". */
420 /* An unknown directive. Don't complain about it in assembly
421 source: we don't know where the comments are, and # may
422 introduce assembler pseudo-ops. Don't complain about invalid
423 directives in skipped conditional groups (6.10 p4). */
424 if (CPP_OPTION (pfile, lang) == CLK_ASM)
426 else if (!pfile->state.skipping)
427 cpp_error (pfile, DL_ERROR, "invalid preprocessing directive #%s",
428 cpp_token_as_text (pfile, dname));
431 pfile->directive = dir;
432 if (CPP_OPTION (pfile, traditional))
433 prepare_directive_trad (pfile);
436 (*pfile->directive->handler) (pfile);
438 _cpp_backup_tokens (pfile, 1);
440 end_directive (pfile, skip);
441 if (was_parsing_args)
443 /* Restore state when within macro args. */
444 pfile->state.parsing_args = 2;
445 pfile->state.prevent_expansion = 1;
446 pfile->buffer->saved_flags |= PREV_WHITE;
451 /* Directive handler wrapper used by the command line option
454 run_directive (pfile, dir_no, buf, count)
460 cpp_push_buffer (pfile, (const uchar *) buf, count,
461 /* from_stage3 */ true, 1);
462 start_directive (pfile);
463 /* We don't want a leading # to be interpreted as a directive. */
464 pfile->buffer->saved_flags = 0;
465 pfile->directive = &dtable[dir_no];
466 if (CPP_OPTION (pfile, traditional))
467 prepare_directive_trad (pfile);
468 (void) (*pfile->directive->handler) (pfile);
469 end_directive (pfile, 1);
470 _cpp_pop_buffer (pfile);
473 /* Checks for validity the macro name in #define, #undef, #ifdef and
474 #ifndef directives. */
475 static cpp_hashnode *
476 lex_macro_node (pfile)
479 const cpp_token *token = _cpp_lex_token (pfile);
481 /* The token immediately after #define must be an identifier. That
482 identifier may not be "defined", per C99 6.10.8p4.
483 In C++, it may not be any of the "named operators" either,
484 per C++98 [lex.digraph], [lex.key].
485 Finally, the identifier may not have been poisoned. (In that case
486 the lexer has issued the error message for us.) */
488 if (token->type == CPP_NAME)
490 cpp_hashnode *node = token->val.node;
492 if (node == pfile->spec_nodes.n_defined)
493 cpp_error (pfile, DL_ERROR,
494 "\"defined\" cannot be used as a macro name");
495 else if (! (node->flags & NODE_POISONED))
498 else if (token->flags & NAMED_OP)
499 cpp_error (pfile, DL_ERROR,
500 "\"%s\" cannot be used as a macro name as it is an operator in C++",
501 NODE_NAME (token->val.node));
502 else if (token->type == CPP_EOF)
503 cpp_error (pfile, DL_ERROR, "no macro name given in #%s directive",
504 pfile->directive->name);
506 cpp_error (pfile, DL_ERROR, "macro names must be identifiers");
511 /* Process a #define directive. Most work is done in cppmacro.c. */
516 cpp_hashnode *node = lex_macro_node (pfile);
520 /* If we have been requested to expand comments into macros,
521 then re-enable saving of comments. */
522 pfile->state.save_comments =
523 ! CPP_OPTION (pfile, discard_comments_in_macro_exp);
525 if (_cpp_create_definition (pfile, node))
526 if (pfile->cb.define)
527 (*pfile->cb.define) (pfile, pfile->directive_line, node);
531 /* Handle #undef. Mark the identifier NT_VOID in the hash table. */
536 cpp_hashnode *node = lex_macro_node (pfile);
538 /* 6.10.3.5 paragraph 2: [#undef] is ignored if the specified identifier
539 is not currently defined as a macro name. */
540 if (node && node->type == NT_MACRO)
543 (*pfile->cb.undef) (pfile, pfile->directive_line, node);
545 if (node->flags & NODE_WARN)
546 cpp_error (pfile, DL_WARNING, "undefining \"%s\"", NODE_NAME (node));
548 if (CPP_OPTION (pfile, warn_unused_macros))
549 _cpp_warn_if_unused_macro (pfile, node, NULL);
551 _cpp_free_definition (node);
556 /* Helper routine used by parse_include. Reinterpret the current line
557 as an h-char-sequence (< ... >); we are looking at the first token
558 after the <. Returns the header as a token, or NULL on failure. */
559 static const cpp_token *
560 glue_header_name (pfile)
563 cpp_token *header = NULL;
564 const cpp_token *token;
565 unsigned char *buffer;
566 size_t len, total_len = 0, capacity = 1024;
568 /* To avoid lexed tokens overwriting our glued name, we can only
569 allocate from the string pool once we've lexed everything. */
570 buffer = (unsigned char *) xmalloc (capacity);
573 token = cpp_get_token (pfile);
575 if (token->type == CPP_GREATER || token->type == CPP_EOF)
578 len = cpp_token_len (token);
579 if (total_len + len > capacity)
581 capacity = (capacity + len) * 2;
582 buffer = (unsigned char *) xrealloc (buffer, capacity);
585 if (token->flags & PREV_WHITE)
586 buffer[total_len++] = ' ';
588 total_len = cpp_spell_token (pfile, token, &buffer[total_len]) - buffer;
591 if (token->type == CPP_EOF)
592 cpp_error (pfile, DL_ERROR, "missing terminating > character");
595 unsigned char *token_mem = _cpp_unaligned_alloc (pfile, total_len + 1);
596 memcpy (token_mem, buffer, total_len);
597 token_mem[total_len] = '\0';
599 header = _cpp_temp_token (pfile);
600 header->type = CPP_HEADER_NAME;
602 header->val.str.len = total_len;
603 header->val.str.text = token_mem;
610 /* Returns the header string of #include, #include_next, #import and
611 #pragma dependency. Returns NULL on error. */
612 static const cpp_token *
613 parse_include (pfile)
616 const unsigned char *dir;
617 const cpp_token *header;
619 if (pfile->directive == &dtable[T_PRAGMA])
620 dir = U"pragma dependency";
622 dir = pfile->directive->name;
624 /* Allow macro expansion. */
625 header = cpp_get_token (pfile);
626 if (header->type != CPP_STRING && header->type != CPP_HEADER_NAME)
628 if (header->type != CPP_LESS)
630 cpp_error (pfile, DL_ERROR,
631 "#%s expects \"FILENAME\" or <FILENAME>", dir);
635 header = glue_header_name (pfile);
640 if (header->val.str.len == 0)
642 cpp_error (pfile, DL_ERROR, "empty file name in #%s", dir);
649 /* Handle #include, #include_next and #import. */
651 do_include_common (pfile, type)
653 enum include_type type;
655 const cpp_token *header;
657 /* For #include_next, if this is the primary source file, warn and
658 use the normal search logic. */
659 if (type == IT_INCLUDE_NEXT && ! pfile->buffer->prev)
661 cpp_error (pfile, DL_WARNING, "#include_next in primary source file");
664 else if (type == IT_IMPORT && CPP_OPTION (pfile, warn_import))
666 CPP_OPTION (pfile, warn_import) = 0;
667 cpp_error (pfile, DL_WARNING,
668 "#import is obsolete, use an #ifndef wrapper in the header file");
671 header = parse_include (pfile);
674 /* Prevent #include recursion. */
675 if (pfile->line_maps.depth >= CPP_STACK_MAX)
676 cpp_error (pfile, DL_ERROR, "#include nested too deeply");
680 /* Get out of macro context, if we are. */
681 skip_rest_of_line (pfile);
682 if (pfile->cb.include)
683 (*pfile->cb.include) (pfile, pfile->directive_line,
684 pfile->directive->name, header);
685 _cpp_execute_include (pfile, header, type);
694 do_include_common (pfile, IT_INCLUDE);
701 do_include_common (pfile, IT_IMPORT);
705 do_include_next (pfile)
708 do_include_common (pfile, IT_INCLUDE_NEXT);
711 /* Subroutine of do_linemarker. Read possible flags after file name.
712 LAST is the last flag seen; 0 if this is the first flag. Return the
713 flag if it is valid, 0 at the end of the directive. Otherwise
716 read_flag (pfile, last)
720 const cpp_token *token = _cpp_lex_token (pfile);
722 if (token->type == CPP_NUMBER && token->val.str.len == 1)
724 unsigned int flag = token->val.str.text[0] - '0';
726 if (flag > last && flag <= 4
727 && (flag != 4 || last == 3)
728 && (flag != 2 || last == 0))
732 if (token->type != CPP_EOF)
733 cpp_error (pfile, DL_ERROR, "invalid flag \"%s\" in line directive",
734 cpp_token_as_text (pfile, token));
738 /* Subroutine of do_line and do_linemarker. Returns a version of STR
739 which has a NUL terminator and all escape sequences converted to
740 their equivalents. Temporary, hopefully. */
742 dequote_string (pfile, str, len)
747 uchar *result = _cpp_unaligned_alloc (pfile, len + 1);
749 const uchar *limit = str + len;
758 *dst++ = cpp_parse_escape (pfile, &str, limit, 0);
764 /* Subroutine of do_line and do_linemarker. Convert a number in STR,
765 of length LEN, to binary; store it in NUMP, and return 0 if the
766 number was well-formed, 1 if not. Temporary, hopefully. */
768 strtoul_for_line (str, len, nump)
773 unsigned long reg = 0;
787 /* Interpret #line command.
788 Note that the filename string (if any) is a true string constant
789 (escapes are interpreted), unlike in #line. */
794 const cpp_token *token;
795 const char *new_file = pfile->map->to_file;
796 unsigned long new_lineno;
798 /* C99 raised the minimum limit on #line numbers. */
799 unsigned int cap = CPP_OPTION (pfile, c99) ? 2147483647 : 32767;
801 /* #line commands expand macros. */
802 token = cpp_get_token (pfile);
803 if (token->type != CPP_NUMBER
804 || strtoul_for_line (token->val.str.text, token->val.str.len,
807 cpp_error (pfile, DL_ERROR,
808 "\"%s\" after #line is not a positive integer",
809 cpp_token_as_text (pfile, token));
813 if (CPP_PEDANTIC (pfile) && (new_lineno == 0 || new_lineno > cap))
814 cpp_error (pfile, DL_PEDWARN, "line number out of range");
816 token = cpp_get_token (pfile);
817 if (token->type == CPP_STRING)
819 new_file = (const char *) dequote_string (pfile, token->val.str.text,
823 else if (token->type != CPP_EOF)
825 cpp_error (pfile, DL_ERROR, "\"%s\" is not a valid filename",
826 cpp_token_as_text (pfile, token));
830 skip_rest_of_line (pfile);
831 _cpp_do_file_change (pfile, LC_RENAME, new_file, new_lineno,
835 /* Interpret the # 44 "file" [flags] notation, which has slightly
836 different syntax and semantics from #line: Flags are allowed,
837 and we never complain about the line number being too big. */
839 do_linemarker (pfile)
842 const cpp_token *token;
843 const char *new_file = pfile->map->to_file;
844 unsigned long new_lineno;
845 unsigned int new_sysp = pfile->map->sysp;
846 enum lc_reason reason = LC_RENAME;
849 /* Back up so we can get the number again. Putting this in
850 _cpp_handle_directive risks two calls to _cpp_backup_tokens in
851 some circumstances, which can segfault. */
852 _cpp_backup_tokens (pfile, 1);
854 /* #line commands expand macros. */
855 token = cpp_get_token (pfile);
856 if (token->type != CPP_NUMBER
857 || strtoul_for_line (token->val.str.text, token->val.str.len,
860 cpp_error (pfile, DL_ERROR, "\"%s\" after # is not a positive integer",
861 cpp_token_as_text (pfile, token));
865 token = cpp_get_token (pfile);
866 if (token->type == CPP_STRING)
868 new_file = (const char *) dequote_string (pfile, token->val.str.text,
871 flag = read_flag (pfile, 0);
875 /* Fake an include for cpp_included (). */
876 _cpp_fake_include (pfile, new_file);
877 flag = read_flag (pfile, flag);
882 flag = read_flag (pfile, flag);
887 flag = read_flag (pfile, flag);
894 else if (token->type != CPP_EOF)
896 cpp_error (pfile, DL_ERROR, "\"%s\" is not a valid filename",
897 cpp_token_as_text (pfile, token));
901 skip_rest_of_line (pfile);
902 _cpp_do_file_change (pfile, reason, new_file, new_lineno, new_sysp);
905 /* Arrange the file_change callback. pfile->line has changed to
906 FILE_LINE of TO_FILE, for reason REASON. SYSP is 1 for a system
907 header, 2 for a system header that needs to be extern "C" protected,
908 and zero otherwise. */
910 _cpp_do_file_change (pfile, reason, to_file, file_line, sysp)
912 enum lc_reason reason;
914 unsigned int file_line;
917 pfile->map = add_line_map (&pfile->line_maps, reason, sysp,
918 pfile->line, to_file, file_line);
920 if (pfile->cb.file_change)
921 (*pfile->cb.file_change) (pfile, pfile->map);
924 /* Report a warning or error detected by the program we are
925 processing. Use the directive's tokens in the error message. */
927 do_diagnostic (pfile, code, print_dir)
932 if (_cpp_begin_message (pfile, code,
933 pfile->cur_token[-1].line,
934 pfile->cur_token[-1].col))
937 fprintf (stderr, "#%s ", pfile->directive->name);
938 pfile->state.prevent_expansion++;
939 cpp_output_line (pfile, stderr);
940 pfile->state.prevent_expansion--;
948 do_diagnostic (pfile, DL_ERROR, 1);
955 /* We want #warning diagnostics to be emitted in system headers too. */
956 do_diagnostic (pfile, DL_WARNING_SYSHDR, 1);
959 /* Report program identification. */
964 const cpp_token *str = cpp_get_token (pfile);
966 if (str->type != CPP_STRING)
967 cpp_error (pfile, DL_ERROR, "invalid #ident directive");
968 else if (pfile->cb.ident)
969 (*pfile->cb.ident) (pfile, pfile->directive_line, &str->val.str);
974 /* Lookup a PRAGMA name in a singly-linked CHAIN. Returns the
975 matching entry, or NULL if none is found. The returned entry could
976 be the start of a namespace chain, or a pragma. */
977 static struct pragma_entry *
978 lookup_pragma_entry (chain, pragma)
979 struct pragma_entry *chain;
980 const cpp_hashnode *pragma;
982 while (chain && chain->pragma != pragma)
988 /* Create and insert a pragma entry for NAME at the beginning of a
989 singly-linked CHAIN. If handler is NULL, it is a namespace,
990 otherwise it is a pragma and its handler. */
991 static struct pragma_entry *
992 insert_pragma_entry (pfile, chain, pragma, handler)
994 struct pragma_entry **chain;
995 const cpp_hashnode *pragma;
998 struct pragma_entry *new;
1000 new = (struct pragma_entry *)
1001 _cpp_aligned_alloc (pfile, sizeof (struct pragma_entry));
1002 new->pragma = pragma;
1006 new->u.handler = handler;
1011 new->u.space = NULL;
1019 /* Register a pragma NAME in namespace SPACE. If SPACE is null, it
1020 goes in the global namespace. HANDLER is the handler it will call,
1021 which must be non-NULL. */
1023 cpp_register_pragma (pfile, space, name, handler)
1029 struct pragma_entry **chain = &pfile->pragmas;
1030 struct pragma_entry *entry;
1031 const cpp_hashnode *node;
1038 node = cpp_lookup (pfile, U space, strlen (space));
1039 entry = lookup_pragma_entry (*chain, node);
1041 entry = insert_pragma_entry (pfile, chain, node, NULL);
1042 else if (!entry->is_nspace)
1044 chain = &entry->u.space;
1047 /* Check for duplicates. */
1048 node = cpp_lookup (pfile, U name, strlen (name));
1049 entry = lookup_pragma_entry (*chain, node);
1052 if (entry->is_nspace)
1054 cpp_error (pfile, DL_ICE,
1055 "registering \"%s\" as both a pragma and a pragma namespace",
1058 cpp_error (pfile, DL_ICE, "#pragma %s %s is already registered",
1061 cpp_error (pfile, DL_ICE, "#pragma %s is already registered", name);
1064 insert_pragma_entry (pfile, chain, node, handler);
1067 /* Register the pragmas the preprocessor itself handles. */
1069 _cpp_init_internal_pragmas (pfile)
1072 /* Pragmas in the global namespace. */
1073 cpp_register_pragma (pfile, 0, "once", do_pragma_once);
1075 /* New GCC-specific pragmas should be put in the GCC namespace. */
1076 cpp_register_pragma (pfile, "GCC", "poison", do_pragma_poison);
1077 cpp_register_pragma (pfile, "GCC", "system_header", do_pragma_system_header);
1078 cpp_register_pragma (pfile, "GCC", "dependency", do_pragma_dependency);
1081 /* Pragmata handling. We handle some, and pass the rest on to the
1082 front end. C99 defines three pragmas and says that no macro
1083 expansion is to be performed on them; whether or not macro
1084 expansion happens for other pragmas is implementation defined.
1085 This implementation never macro-expands the text after #pragma. */
1090 const struct pragma_entry *p = NULL;
1091 const cpp_token *token;
1092 unsigned int count = 1;
1094 pfile->state.prevent_expansion++;
1096 token = cpp_get_token (pfile);
1097 if (token->type == CPP_NAME)
1099 p = lookup_pragma_entry (pfile->pragmas, token->val.node);
1100 if (p && p->is_nspace)
1103 token = cpp_get_token (pfile);
1104 if (token->type == CPP_NAME)
1105 p = lookup_pragma_entry (p->u.space, token->val.node);
1111 /* FIXME. This is an awful kludge to get the front ends to update
1112 their notion of line number for diagnostic purposes. The line
1113 number should be passed to the handler and they should do it
1114 themselves. Stand-alone CPP must ignore us, otherwise it will
1115 prefix the directive with spaces, hence the 1. Ugh. */
1116 if (pfile->cb.line_change)
1117 (*pfile->cb.line_change)(pfile, token, 1);
1120 (*p->u.handler) (pfile);
1121 else if (pfile->cb.def_pragma)
1123 _cpp_backup_tokens (pfile, count);
1124 (*pfile->cb.def_pragma) (pfile, pfile->directive_line);
1127 pfile->state.prevent_expansion--;
1130 /* Handle #pragma once. */
1132 do_pragma_once (pfile)
1135 cpp_error (pfile, DL_WARNING, "#pragma once is obsolete");
1137 if (pfile->buffer->prev == NULL)
1138 cpp_error (pfile, DL_WARNING, "#pragma once in main file");
1140 _cpp_never_reread (pfile->buffer->inc);
1145 /* Handle #pragma GCC poison, to poison one or more identifiers so
1146 that the lexer produces a hard error for each subsequent usage. */
1148 do_pragma_poison (pfile)
1151 const cpp_token *tok;
1154 pfile->state.poisoned_ok = 1;
1157 tok = _cpp_lex_token (pfile);
1158 if (tok->type == CPP_EOF)
1160 if (tok->type != CPP_NAME)
1162 cpp_error (pfile, DL_ERROR, "invalid #pragma GCC poison directive");
1167 if (hp->flags & NODE_POISONED)
1170 if (hp->type == NT_MACRO)
1171 cpp_error (pfile, DL_WARNING, "poisoning existing macro \"%s\"",
1173 _cpp_free_definition (hp);
1174 hp->flags |= NODE_POISONED | NODE_DIAGNOSTIC;
1176 pfile->state.poisoned_ok = 0;
1179 /* Mark the current header as a system header. This will suppress
1180 some categories of warnings (notably those from -pedantic). It is
1181 intended for use in system libraries that cannot be implemented in
1182 conforming C, but cannot be certain that their headers appear in a
1183 system include directory. To prevent abuse, it is rejected in the
1184 primary source file. */
1186 do_pragma_system_header (pfile)
1189 cpp_buffer *buffer = pfile->buffer;
1191 if (buffer->prev == 0)
1192 cpp_error (pfile, DL_WARNING,
1193 "#pragma system_header ignored outside include file");
1197 skip_rest_of_line (pfile);
1198 cpp_make_system_header (pfile, 1, 0);
1202 /* Check the modified date of the current include file against a specified
1203 file. Issue a diagnostic, if the specified file is newer. We use this to
1204 determine if a fixed header should be refixed. */
1206 do_pragma_dependency (pfile)
1209 const cpp_token *header;
1212 header = parse_include (pfile);
1216 ordering = _cpp_compare_file_date (pfile, header);
1218 cpp_error (pfile, DL_WARNING, "cannot find source %s",
1219 cpp_token_as_text (pfile, header));
1220 else if (ordering > 0)
1222 cpp_error (pfile, DL_WARNING, "current file is older than %s",
1223 cpp_token_as_text (pfile, header));
1224 if (cpp_get_token (pfile)->type != CPP_EOF)
1226 _cpp_backup_tokens (pfile, 1);
1227 do_diagnostic (pfile, DL_WARNING, 0);
1232 /* Get a token but skip padding. */
1233 static const cpp_token *
1234 get_token_no_padding (pfile)
1239 const cpp_token *result = cpp_get_token (pfile);
1240 if (result->type != CPP_PADDING)
1245 /* Check syntax is "(string-literal)". Returns the string on success,
1246 or NULL on failure. */
1247 static const cpp_token *
1248 get__Pragma_string (pfile)
1251 const cpp_token *string;
1253 if (get_token_no_padding (pfile)->type != CPP_OPEN_PAREN)
1256 string = get_token_no_padding (pfile);
1257 if (string->type != CPP_STRING && string->type != CPP_WSTRING)
1260 if (get_token_no_padding (pfile)->type != CPP_CLOSE_PAREN)
1266 /* Destringize IN into a temporary buffer, by removing the first \ of
1267 \" and \\ sequences, and process the result as a #pragma directive. */
1269 destringize_and_run (pfile, in)
1271 const cpp_string *in;
1273 const unsigned char *src, *limit;
1274 char *dest, *result;
1276 dest = result = alloca (in->len + 1);
1277 for (src = in->text, limit = src + in->len; src < limit;)
1279 /* We know there is a character following the backslash. */
1280 if (*src == '\\' && (src[1] == '\\' || src[1] == '"'))
1286 run_directive (pfile, T_PRAGMA, result, dest - result);
1289 /* Handle the _Pragma operator. */
1291 _cpp_do__Pragma (pfile)
1294 const cpp_token *string = get__Pragma_string (pfile);
1297 cpp_error (pfile, DL_ERROR,
1298 "_Pragma takes a parenthesized string literal");
1301 /* Ideally, we'd like
1302 token1 _Pragma ("foo") token2
1309 Getting these correct line markers is a little tricky. */
1311 unsigned int orig_line = pfile->line;
1312 destringize_and_run (pfile, &string->val.str);
1313 pfile->line = orig_line;
1314 pfile->buffer->saved_flags = BOL;
1318 /* Just ignore #sccs on all systems. */
1321 cpp_reader *pfile ATTRIBUTE_UNUSED;
1325 /* Handle #ifdef. */
1332 if (! pfile->state.skipping)
1334 const cpp_hashnode *node = lex_macro_node (pfile);
1338 skip = node->type != NT_MACRO;
1339 _cpp_mark_macro_used (node);
1344 push_conditional (pfile, skip, T_IFDEF, 0);
1347 /* Handle #ifndef. */
1353 const cpp_hashnode *node = 0;
1355 if (! pfile->state.skipping)
1357 node = lex_macro_node (pfile);
1361 skip = node->type == NT_MACRO;
1362 _cpp_mark_macro_used (node);
1367 push_conditional (pfile, skip, T_IFNDEF, node);
1370 /* _cpp_parse_expr puts a macro in a "#if !defined ()" expression in
1371 pfile->mi_ind_cmacro so we can handle multiple-include
1372 optimisations. If macro expansion occurs in the expression, we
1373 cannot treat it as a controlling conditional, since the expansion
1374 could change in the future. That is handled by cpp_get_token. */
1381 if (! pfile->state.skipping)
1382 skip = _cpp_parse_expr (pfile) == false;
1384 push_conditional (pfile, skip, T_IF, pfile->mi_ind_cmacro);
1387 /* Flip skipping state if appropriate and continue without changing
1388 if_stack; this is so that the error message for missing #endif's
1389 etc. will point to the original #if. */
1394 cpp_buffer *buffer = pfile->buffer;
1395 struct if_stack *ifs = buffer->if_stack;
1398 cpp_error (pfile, DL_ERROR, "#else without #if");
1401 if (ifs->type == T_ELSE)
1403 cpp_error (pfile, DL_ERROR, "#else after #else");
1404 cpp_error_with_line (pfile, DL_ERROR, ifs->line, 0,
1405 "the conditional began here");
1409 /* Skip any future (erroneous) #elses or #elifs. */
1410 pfile->state.skipping = ifs->skip_elses;
1411 ifs->skip_elses = true;
1413 /* Invalidate any controlling macro. */
1416 /* Only check EOL if was not originally skipping. */
1417 if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels))
1422 /* Handle a #elif directive by not changing if_stack either. See the
1423 comment above do_else. */
1428 cpp_buffer *buffer = pfile->buffer;
1429 struct if_stack *ifs = buffer->if_stack;
1432 cpp_error (pfile, DL_ERROR, "#elif without #if");
1435 if (ifs->type == T_ELSE)
1437 cpp_error (pfile, DL_ERROR, "#elif after #else");
1438 cpp_error_with_line (pfile, DL_ERROR, ifs->line, 0,
1439 "the conditional began here");
1443 /* Only evaluate this if we aren't skipping elses. During
1444 evaluation, set skipping to false to get lexer warnings. */
1445 if (ifs->skip_elses)
1446 pfile->state.skipping = 1;
1449 pfile->state.skipping = 0;
1450 pfile->state.skipping = ! _cpp_parse_expr (pfile);
1451 ifs->skip_elses = ! pfile->state.skipping;
1454 /* Invalidate any controlling macro. */
1459 /* #endif pops the if stack and resets pfile->state.skipping. */
1464 cpp_buffer *buffer = pfile->buffer;
1465 struct if_stack *ifs = buffer->if_stack;
1468 cpp_error (pfile, DL_ERROR, "#endif without #if");
1471 /* Only check EOL if was not originally skipping. */
1472 if (!ifs->was_skipping && CPP_OPTION (pfile, warn_endif_labels))
1475 /* If potential control macro, we go back outside again. */
1476 if (ifs->next == 0 && ifs->mi_cmacro)
1478 pfile->mi_valid = true;
1479 pfile->mi_cmacro = ifs->mi_cmacro;
1482 buffer->if_stack = ifs->next;
1483 pfile->state.skipping = ifs->was_skipping;
1484 obstack_free (&pfile->buffer_ob, ifs);
1488 /* Push an if_stack entry for a preprocessor conditional, and set
1489 pfile->state.skipping to SKIP. If TYPE indicates the conditional
1490 is #if or #ifndef, CMACRO is a potentially controlling macro, and
1491 we need to check here that we are at the top of the file. */
1493 push_conditional (pfile, skip, type, cmacro)
1497 const cpp_hashnode *cmacro;
1499 struct if_stack *ifs;
1500 cpp_buffer *buffer = pfile->buffer;
1502 ifs = xobnew (&pfile->buffer_ob, struct if_stack);
1503 ifs->line = pfile->directive_line;
1504 ifs->next = buffer->if_stack;
1505 ifs->skip_elses = pfile->state.skipping || !skip;
1506 ifs->was_skipping = pfile->state.skipping;
1508 /* This condition is effectively a test for top-of-file. */
1509 if (pfile->mi_valid && pfile->mi_cmacro == 0)
1510 ifs->mi_cmacro = cmacro;
1514 pfile->state.skipping = skip;
1515 buffer->if_stack = ifs;
1518 /* Read the tokens of the answer into the macro pool, in a directive
1519 of type TYPE. Only commit the memory if we intend it as permanent
1520 storage, i.e. the #assert case. Returns 0 on success, and sets
1521 ANSWERP to point to the answer. */
1523 parse_answer (pfile, answerp, type)
1525 struct answer **answerp;
1528 const cpp_token *paren;
1529 struct answer *answer;
1530 unsigned int acount;
1532 /* In a conditional, it is legal to not have an open paren. We
1533 should save the following token in this case. */
1534 paren = cpp_get_token (pfile);
1536 /* If not a paren, see if we're OK. */
1537 if (paren->type != CPP_OPEN_PAREN)
1539 /* In a conditional no answer is a test for any answer. It
1540 could be followed by any token. */
1543 _cpp_backup_tokens (pfile, 1);
1547 /* #unassert with no answer is valid - it removes all answers. */
1548 if (type == T_UNASSERT && paren->type == CPP_EOF)
1551 cpp_error (pfile, DL_ERROR, "missing '(' after predicate");
1555 for (acount = 0;; acount++)
1558 const cpp_token *token = cpp_get_token (pfile);
1561 if (token->type == CPP_CLOSE_PAREN)
1564 if (token->type == CPP_EOF)
1566 cpp_error (pfile, DL_ERROR, "missing ')' to complete answer");
1570 /* struct answer includes the space for one token. */
1571 room_needed = (sizeof (struct answer) + acount * sizeof (cpp_token));
1573 if (BUFF_ROOM (pfile->a_buff) < room_needed)
1574 _cpp_extend_buff (pfile, &pfile->a_buff, sizeof (struct answer));
1576 dest = &((struct answer *) BUFF_FRONT (pfile->a_buff))->first[acount];
1579 /* Drop whitespace at start, for answer equivalence purposes. */
1581 dest->flags &= ~PREV_WHITE;
1586 cpp_error (pfile, DL_ERROR, "predicate's answer is empty");
1590 answer = (struct answer *) BUFF_FRONT (pfile->a_buff);
1591 answer->count = acount;
1592 answer->next = NULL;
1598 /* Parses an assertion directive of type TYPE, returning a pointer to
1599 the hash node of the predicate, or 0 on error. If an answer was
1600 supplied, it is placed in ANSWERP, otherwise it is set to 0. */
1601 static cpp_hashnode *
1602 parse_assertion (pfile, answerp, type)
1604 struct answer **answerp;
1607 cpp_hashnode *result = 0;
1608 const cpp_token *predicate;
1610 /* We don't expand predicates or answers. */
1611 pfile->state.prevent_expansion++;
1614 predicate = cpp_get_token (pfile);
1615 if (predicate->type == CPP_EOF)
1616 cpp_error (pfile, DL_ERROR, "assertion without predicate");
1617 else if (predicate->type != CPP_NAME)
1618 cpp_error (pfile, DL_ERROR, "predicate must be an identifier");
1619 else if (parse_answer (pfile, answerp, type) == 0)
1621 unsigned int len = NODE_LEN (predicate->val.node);
1622 unsigned char *sym = alloca (len + 1);
1624 /* Prefix '#' to get it out of macro namespace. */
1626 memcpy (sym + 1, NODE_NAME (predicate->val.node), len);
1627 result = cpp_lookup (pfile, sym, len + 1);
1630 pfile->state.prevent_expansion--;
1634 /* Returns a pointer to the pointer to CANDIDATE in the answer chain,
1635 or a pointer to NULL if the answer is not in the chain. */
1636 static struct answer **
1637 find_answer (node, candidate)
1639 const struct answer *candidate;
1642 struct answer **result;
1644 for (result = &node->value.answers; *result; result = &(*result)->next)
1646 struct answer *answer = *result;
1648 if (answer->count == candidate->count)
1650 for (i = 0; i < answer->count; i++)
1651 if (! _cpp_equiv_tokens (&answer->first[i], &candidate->first[i]))
1654 if (i == answer->count)
1662 /* Test an assertion within a preprocessor conditional. Returns
1663 non-zero on failure, zero on success. On success, the result of
1664 the test is written into VALUE. */
1666 _cpp_test_assertion (pfile, value)
1668 unsigned int *value;
1670 struct answer *answer;
1673 node = parse_assertion (pfile, &answer, T_IF);
1675 *value = (node->type == NT_ASSERTION &&
1676 (answer == 0 || *find_answer (node, answer) != 0));
1677 else if (pfile->cur_token[-1].type == CPP_EOF)
1678 _cpp_backup_tokens (pfile, 1);
1680 /* We don't commit the memory for the answer - it's temporary only. */
1684 /* Handle #assert. */
1689 struct answer *new_answer;
1692 node = parse_assertion (pfile, &new_answer, T_ASSERT);
1695 /* Place the new answer in the answer list. First check there
1696 is not a duplicate. */
1697 new_answer->next = 0;
1698 if (node->type == NT_ASSERTION)
1700 if (*find_answer (node, new_answer))
1702 cpp_error (pfile, DL_WARNING, "\"%s\" re-asserted",
1703 NODE_NAME (node) + 1);
1706 new_answer->next = node->value.answers;
1709 node->type = NT_ASSERTION;
1710 node->value.answers = new_answer;
1711 BUFF_FRONT (pfile->a_buff) += (sizeof (struct answer)
1712 + (new_answer->count - 1)
1713 * sizeof (cpp_token));
1718 /* Handle #unassert. */
1724 struct answer *answer;
1726 node = parse_assertion (pfile, &answer, T_UNASSERT);
1727 /* It isn't an error to #unassert something that isn't asserted. */
1728 if (node && node->type == NT_ASSERTION)
1732 struct answer **p = find_answer (node, answer), *temp;
1734 /* Remove the answer from the list. */
1739 /* Did we free the last answer? */
1740 if (node->value.answers == 0)
1741 node->type = NT_VOID;
1746 _cpp_free_definition (node);
1749 /* We don't commit the memory for the answer - it's temporary only. */
1752 /* These are for -D, -U, -A. */
1754 /* Process the string STR as if it appeared as the body of a #define.
1755 If STR is just an identifier, define it with value 1.
1756 If STR has anything after the identifier, then it should
1757 be identifier=definition. */
1759 cpp_define (pfile, str)
1766 /* Copy the entire option so we can modify it.
1767 Change the first "=" in the string to a space. If there is none,
1768 tack " 1" on the end. */
1770 count = strlen (str);
1771 buf = (char *) alloca (count + 3);
1772 memcpy (buf, str, count);
1774 p = strchr (str, '=');
1784 run_directive (pfile, T_DEFINE, buf, count);
1787 /* Slight variant of the above for use by initialize_builtins. */
1789 _cpp_define_builtin (pfile, str)
1793 run_directive (pfile, T_DEFINE, str, strlen (str));
1796 /* Process MACRO as if it appeared as the body of an #undef. */
1798 cpp_undef (pfile, macro)
1802 run_directive (pfile, T_UNDEF, macro, strlen (macro));
1805 /* Process the string STR as if it appeared as the body of a #assert. */
1807 cpp_assert (pfile, str)
1811 handle_assertion (pfile, str, T_ASSERT);
1814 /* Process STR as if it appeared as the body of an #unassert. */
1816 cpp_unassert (pfile, str)
1820 handle_assertion (pfile, str, T_UNASSERT);
1823 /* Common code for cpp_assert (-A) and cpp_unassert (-A-). */
1825 handle_assertion (pfile, str, type)
1830 size_t count = strlen (str);
1831 const char *p = strchr (str, '=');
1835 /* Copy the entire option so we can modify it. Change the first
1836 "=" in the string to a '(', and tack a ')' on the end. */
1837 char *buf = (char *) alloca (count + 2);
1839 memcpy (buf, str, count);
1846 run_directive (pfile, type, str, count);
1849 /* The number of errors for a given reader. */
1854 return pfile->errors;
1857 /* The options structure. */
1859 cpp_get_options (pfile)
1862 return &pfile->opts;
1865 /* The callbacks structure. */
1867 cpp_get_callbacks (pfile)
1873 /* The line map set. */
1874 const struct line_maps *
1875 cpp_get_line_maps (pfile)
1878 return &pfile->line_maps;
1881 /* Copy the given callbacks structure to our own. */
1883 cpp_set_callbacks (pfile, cb)
1890 /* Push a new buffer on the buffer stack. Returns the new buffer; it
1891 doesn't fail. It does not generate a file change call back; that
1892 is the responsibility of the caller. */
1894 cpp_push_buffer (pfile, buffer, len, from_stage3, return_at_eof)
1896 const uchar *buffer;
1901 cpp_buffer *new = xobnew (&pfile->buffer_ob, cpp_buffer);
1903 /* Clears, amongst other things, if_stack and mi_cmacro. */
1904 memset (new, 0, sizeof (cpp_buffer));
1906 new->line_base = new->buf = new->cur = buffer;
1907 new->rlimit = buffer + len;
1908 new->from_stage3 = from_stage3 || CPP_OPTION (pfile, traditional);
1909 new->prev = pfile->buffer;
1910 new->return_at_eof = return_at_eof;
1911 new->saved_flags = BOL;
1913 pfile->buffer = new;
1918 /* Pops a single buffer, with a file change call-back if appropriate.
1919 Then pushes the next -include file, if any remain. */
1921 _cpp_pop_buffer (pfile)
1924 cpp_buffer *buffer = pfile->buffer;
1925 struct include_file *inc = buffer->inc;
1926 struct if_stack *ifs;
1928 /* Walk back up the conditional stack till we reach its level at
1929 entry to this file, issuing error messages. */
1930 for (ifs = buffer->if_stack; ifs; ifs = ifs->next)
1931 cpp_error_with_line (pfile, DL_ERROR, ifs->line, 0,
1932 "unterminated #%s", dtable[ifs->type].name);
1934 /* In case of a missing #endif. */
1935 pfile->state.skipping = 0;
1937 /* _cpp_do_file_change expects pfile->buffer to be the new one. */
1938 pfile->buffer = buffer->prev;
1940 /* Free the buffer object now; we may want to push a new buffer
1941 in _cpp_push_next_include_file. */
1942 obstack_free (&pfile->buffer_ob, buffer);
1946 _cpp_pop_file_buffer (pfile, inc);
1948 /* Don't generate a callback for popping the main file. */
1951 _cpp_do_file_change (pfile, LC_LEAVE, 0, 0, 0);
1953 /* If this is the main file, there may be some -include
1954 files left to push. */
1955 if (!pfile->buffer->prev)
1956 _cpp_maybe_push_include_file (pfile);
1961 /* Enter all recognised directives in the hash table. */
1963 _cpp_init_directives (pfile)
1969 for (i = 0; i < (unsigned int) N_DIRECTIVES; i++)
1971 node = cpp_lookup (pfile, dtable[i].name, dtable[i].length);
1972 node->directive_index = i + 1;