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1/* Definitions for CPP library.
2 Copyright (C) 1995 Free Software Foundation, Inc.
3 Written by Per Bothner, 1994-95.
4
5This program is free software; you can redistribute it and/or modify it
6under the terms of the GNU General Public License as published by the
7Free Software Foundation; either version 2, or (at your option) any
8later version.
9
10This program is distributed in the hope that it will be useful,
11but WITHOUT ANY WARRANTY; without even the implied warranty of
12MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
18
19 In other words, you are welcome to use, share and improve this program.
20 You are forbidden to forbid anyone else to use, share and improve
21 what you give them. Help stamp out software-hoarding! */
22
23#include <stdarg.h>
24#include <sys/types.h>
25#include <sys/stat.h>
26
27#ifndef HOST_BITS_PER_WIDE_INT
28
29#if HOST_BITS_PER_LONG > HOST_BITS_PER_INT
30#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
31#define HOST_WIDE_INT long
32#else
33#define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_INT
34#define HOST_WIDE_INT int
35#endif
36
37#endif
38
39#define STATIC_BUFFERS
40
41typedef struct cpp_reader cpp_reader;
42typedef struct cpp_buffer cpp_buffer;
43typedef struct cpp_options cpp_options;
44
45enum cpp_token {
46 CPP_EOF = -1,
47 CPP_OTHER = 0,
48 CPP_COMMENT = 1,
49 CPP_HSPACE,
50 CPP_VSPACE, /* newlines and #line directives */
51 CPP_NAME,
52 CPP_NUMBER,
53 CPP_CHAR,
54 CPP_STRING,
55 CPP_DIRECTIVE,
56 CPP_LPAREN, /* "(" */
57 CPP_RPAREN, /* ")" */
58 CPP_LBRACE, /* "{" */
59 CPP_RBRACE, /* "}" */
60 CPP_COMMA, /* "," */
61 CPP_SEMICOLON, /* ";" */
62 CPP_3DOTS, /* "..." */
63 /* POP_TOKEN is returned when we've popped a cpp_buffer. */
64 CPP_POP
65};
66
67typedef enum cpp_token (*parse_underflow_t) (cpp_reader *);
68typedef int (*parse_cleanup_t) (cpp_buffer *, cpp_reader *);
69
70/* A parse_marker indicates a previous position,
71 which we can backtrack to. */
72
73struct parse_marker {
74 cpp_buffer *buf;
75 struct parse_marker *next;
76 int position;
77};
78
79extern int cpp_handle_options(cpp_reader * pfile, int, char **);
80extern enum cpp_token cpp_get_token(cpp_reader * pfile);
81extern void cpp_skip_hspace(cpp_reader * pfile);
82
83/* Maintain and search list of included files, for #import. */
84
85#define IMPORT_HASH_SIZE 31
86
87struct import_file {
88 char *name;
89 ino_t inode;
90 dev_t dev;
91 struct import_file *next;
92};
93
94/* If we have a huge buffer, may need to cache more recent counts */
95#define CPP_LINE_BASE(BUF) ((BUF)->buf + (BUF)->line_base)
96
97enum dump_type {
98 dump_none = 0, dump_only, dump_names, dump_definitions
99};
100
101struct cpp_buffer {
102 unsigned char *buf;
103 unsigned char *cur;
104 unsigned char *rlimit; /* end of valid data */
105 unsigned char *alimit; /* end of allocated buffer */
106 unsigned char *prev; /* start of current token */
107
108 const char *fname;
109 /* Filename specified with #line command. */
110 const char *nominal_fname;
111
112 /* Record where in the search path this file was found.
113 * For #include_next. */
114 struct file_name_list *dir;
115
116 long line_base;
117 long lineno; /* Line number at CPP_LINE_BASE. */
118 long colno; /* Column number at CPP_LINE_BASE. */
119#ifndef STATIC_BUFFERS
120 cpp_buffer *chain;
121#endif
122 parse_underflow_t underflow;
123 parse_cleanup_t cleanup;
124 void *data;
125 struct parse_marker *marks;
126 /* Value of if_stack at start of this file.
127 * Used to prohibit unmatched #endif (etc) in an include file. */
128 struct if_stack *if_stack;
129
130 /* True if this is a header file included using <FILENAME>. */
131 char system_header_p;
132 char seen_eof;
133
134 /* True if buffer contains escape sequences.
135 * Currently there are are only two kind:
136 * "@-" means following identifier should not be macro-expanded.
137 * "@ " means a token-separator. This turns into " " in final output
138 * if not stringizing and needed to separate tokens; otherwise nothing.
139 * "@@" means a normal '@'.
140 * (An '@' inside a string stands for itself and is never an escape.) */
141 char has_escapes;
142};
143
144struct cpp_pending; /* Forward declaration - for C++. */
145struct file_name_map_list;
146
147typedef struct assertion_hashnode ASSERTION_HASHNODE;
148
149#define ASSERTION_HASHSIZE 37
150
151#ifdef STATIC_BUFFERS
152/* Maximum nesting of cpp_buffers. We use a static limit, partly for
153 efficiency, and partly to limit runaway recursion. */
154#define CPP_STACK_MAX 200
155#endif
156
157struct cpp_reader {
158 unsigned char *limit;
159 parse_underflow_t get_token;
160 cpp_buffer *buffer;
161#ifdef STATIC_BUFFERS
162 cpp_buffer buffer_stack[CPP_STACK_MAX];
163#endif
164
165 int errors; /* Error counter for exit code */
166 void *data;
167
168 unsigned char *token_buffer;
169 int token_buffer_size;
170
171 /* Line where a newline was first seen in a string constant. */
172 int multiline_string_line;
173
174 /* Current depth in #include directives that use <...>. */
175 int system_include_depth;
176
177 /* List of included files that contained #pragma once. */
178 struct file_name_list *dont_repeat_files;
179
180 /* List of other included files.
181 * If ->control_macro if nonzero, the file had a #ifndef
182 * around the entire contents, and ->control_macro gives the macro name. */
183 struct file_name_list *all_include_files;
184
185 /* Current maximum length of directory names in the search path
186 * for include files. (Altered as we get more of them.) */
187 int max_include_len;
188
189 /* Hash table of files already included with #include or #import. */
190 struct import_file *import_hash_table[IMPORT_HASH_SIZE];
191
192 struct if_stack *if_stack;
193
194 /* Nonzero means we are inside an IF during a -pcp run. In this mode
195 * macro expansion is done, and preconditions are output for all macro
196 * uses requiring them. */
197 char pcp_inside_if;
198
199 /* Nonzero means we have printed (while error reporting) a list of
200 * containing files that matches the current status. */
201 char input_stack_listing_current;
202
203 /* If non-zero, macros are not expanded. */
204 char no_macro_expand;
205
206 /* Print column number in error messages. */
207 char show_column;
208
209 /* We're printed a warning recommending against using #import. */
210 char import_warning;
211
212 /* If true, character between '<' and '>' are a single (string) token. */
213 char parsing_include_directive;
214
215 /* True if escape sequences (as described for has_escapes in
216 * parse_buffer) should be emitted. */
217 char output_escapes;
218
219 /* 0: Have seen non-white-space on this line.
220 * 1: Only seen white space so far on this line.
221 * 2: Only seen white space so far in this file. */
222 char only_seen_white;
223
224 /* Nonzero means this file was included with a -imacros or -include
225 * command line and should not be recorded as an include file. */
226
227 int no_record_file;
228
229 long lineno;
230
231 struct tm *timebuf;
232
233 ASSERTION_HASHNODE *assertion_hashtab[ASSERTION_HASHSIZE];
234
235 /* Buffer of -M output. */
236 char *deps_buffer;
237
238 /* Number of bytes allocated in above. */
239 int deps_allocated_size;
240
241 /* Number of bytes used. */
242 int deps_size;
243
244 /* Number of bytes since the last newline. */
245 int deps_column;
246};
247
248#define CPP_BUF_PEEK(BUFFER) \
249 ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur : EOF)
250#define CPP_BUF_GET(BUFFER) \
251 ((BUFFER)->cur < (BUFFER)->rlimit ? *(BUFFER)->cur++ : EOF)
252#define CPP_FORWARD(BUFFER, N) ((BUFFER)->cur += (N))
253
254/* Number of characters currently in PFILE's output buffer. */
255#define CPP_WRITTEN(PFILE) ((PFILE)->limit - (PFILE)->token_buffer)
256#define CPP_PWRITTEN(PFILE) ((PFILE)->limit)
257
258/* Make sure PFILE->token_buffer has space for at least N more characters. */
259#define CPP_RESERVE(PFILE, N) \
260 ((unsigned int)(CPP_WRITTEN (PFILE) + N) > (unsigned int) (PFILE)->token_buffer_size \
261 && (cpp_grow_buffer (PFILE, N), 0))
262
263/* Append string STR (of length N) to PFILE's output buffer.
264 Assume there is enough space. */
265#define CPP_PUTS_Q(PFILE, STR, N) \
266 do { memcpy ((PFILE)->limit, STR, (N)); (PFILE)->limit += (N); } while(0)
267/* Append string STR (of length N) to PFILE's output buffer. Make space. */
268#define CPP_PUTS(PFILE, STR, N) \
269 do { CPP_RESERVE(PFILE, N); CPP_PUTS_Q(PFILE, STR,N); } while(0)
270/* Append character CH to PFILE's output buffer. Assume sufficient space. */
271#define CPP_PUTC_Q(PFILE, CH) (*(PFILE)->limit++ = (CH))
272/* Append character CH to PFILE's output buffer. Make space if need be. */
273#define CPP_PUTC(PFILE, CH) \
274 do { CPP_RESERVE (PFILE, 1); CPP_PUTC_Q (PFILE, CH); } while(0)
275/* Make sure PFILE->limit is followed by '\0'. */
276#define CPP_NUL_TERMINATE_Q(PFILE) (*(PFILE)->limit = 0)
277#define CPP_NUL_TERMINATE(PFILE) \
278 do { CPP_RESERVE(PFILE, 1); *(PFILE)->limit = 0; } while(0)
279#define CPP_ADJUST_WRITTEN(PFILE,DELTA) ((PFILE)->limit += (DELTA))
280#define CPP_SET_WRITTEN(PFILE,N) ((PFILE)->limit = (PFILE)->token_buffer + (N))
281
282#define CPP_OPTIONS(PFILE) ((cpp_options*)(PFILE)->data)
283#define CPP_BUFFER(PFILE) ((PFILE)->buffer)
284#ifdef STATIC_BUFFERS
285#define CPP_PREV_BUFFER(BUFFER) ((BUFFER)+1)
286#define CPP_NULL_BUFFER(PFILE) (&(PFILE)->buffer_stack[CPP_STACK_MAX])
287#else
288#define CPP_PREV_BUFFER(BUFFER) ((BUFFER)->chain)
289#define CPP_NULL_BUFFER(PFILE) ((cpp_buffer*)0)
290#endif
291
292/* Pointed to by parse_file::data. */
293struct cpp_options {
294 const char *in_fname;
295
296 /* Name of output file, for error messages. */
297 const char *out_fname;
298
299 struct file_name_map_list *map_list;
300
301 /* Non-0 means -v, so print the full set of include dirs. */
302 char verbose;
303
304 /* Nonzero means use extra default include directories for C++. */
305
306 char cplusplus;
307
308 /* Nonzero means handle cplusplus style comments */
309
310 char cplusplus_comments;
311
312 /* Nonzero means handle #import, for objective C. */
313
314 char objc;
315
316 /* Nonzero means this is an assembly file, and allow
317 * unknown directives, which could be comments. */
318
319 int lang_asm;
320
321 /* Nonzero means turn NOTREACHED into #pragma NOTREACHED etc */
322
323 char for_lint;
324
325 /* Nonzero means handle CHILL comment syntax
326 * and output CHILL string delimiter for __DATE___ etc. */
327
328 char chill;
329
330 /* Nonzero means copy comments into the output file. */
331
332 char put_out_comments;
333
334 /* Nonzero means don't process the ANSI trigraph sequences. */
335
336 char no_trigraphs;
337
338 /* Nonzero means print the names of included files rather than
339 * the preprocessed output. 1 means just the #include "...",
340 * 2 means #include <...> as well. */
341
342 char print_deps;
343
344 /* Nonzero if missing .h files in -M output are assumed to be generated
345 * files and not errors. */
346
347 char print_deps_missing_files;
348
349 /* If true, fopen (deps_file, "a") else fopen (deps_file, "w"). */
350 char print_deps_append;
351
352 /* Nonzero means print names of header files (-H). */
353
354 char print_include_names;
355
356 /* Nonzero means try to make failure to fit ANSI C an error. */
357
358 char pedantic_errors;
359
360 /* Nonzero means don't print warning messages. -w. */
361
362 char inhibit_warnings;
363
364 /* Nonzero means warn if slash-star appears in a comment. */
365
366 char warn_comments;
367
368 /* Nonzero means warn if there are any trigraphs. */
369
370 char warn_trigraphs;
371
372 /* Nonzero means warn if #import is used. */
373
374 char warn_import;
375
376 /* Nonzero means warn if a macro argument is (or would be)
377 * stringified with -traditional. */
378
379 char warn_stringify;
380
381 /* Nonzero means turn warnings into errors. */
382
383 char warnings_are_errors;
384
385 /* Nonzero causes output not to be done,
386 * but directives such as #define that have side effects
387 * are still obeyed. */
388
389 char no_output;
390
391 /* Nonzero means don't output line number information. */
392
393 char no_line_commands;
394
395/* Nonzero means output the text in failing conditionals,
396 inside #failed ... #endfailed. */
397
398 char output_conditionals;
399
400 /* Nonzero means -I- has been seen,
401 * so don't look for #include "foo" the source-file directory. */
402 char ignore_srcdir;
403
404/* Zero means dollar signs are punctuation.
405 -$ stores 0; -traditional may store 1. Default is 1 for VMS, 0 otherwise.
406 This must be 0 for correct processing of this ANSI C program:
407 #define foo(a) #a
408 #define lose(b) foo (b)
409 #define test$
410 lose (test) */
411 char dollars_in_ident;
412#ifndef DOLLARS_IN_IDENTIFIERS
413#define DOLLARS_IN_IDENTIFIERS 1
414#endif
415
416 /* Nonzero means try to imitate old fashioned non-ANSI preprocessor. */
417 char traditional;
418
419 /* Nonzero means give all the error messages the ANSI standard requires. */
420 char pedantic;
421
422 char done_initializing;
423
424 struct file_name_list *include; /* First dir to search */
425 /* First dir to search for <file> */
426 /* This is the first element to use for #include <...>.
427 * If it is 0, use the entire chain for such includes. */
428 struct file_name_list *first_bracket_include;
429 /* This is the first element in the chain that corresponds to
430 * a directory of system header files. */
431 struct file_name_list *first_system_include;
432 struct file_name_list *last_include; /* Last in chain */
433
434 /* Chain of include directories to put at the end of the other chain. */
435 struct file_name_list *after_include;
436 struct file_name_list *last_after_include; /* Last in chain */
437
438 /* Chain to put at the start of the system include files. */
439 struct file_name_list *before_system;
440 struct file_name_list *last_before_system; /* Last in chain */
441
442 /* Directory prefix that should replace `/usr' in the standard
443 * include file directories. */
444 char *include_prefix;
445
446 char inhibit_predefs;
447 char no_standard_includes;
448 char no_standard_cplusplus_includes;
449
450/* dump_only means inhibit output of the preprocessed text
451 and instead output the definitions of all user-defined
452 macros in a form suitable for use as input to cccp.
453 dump_names means pass #define and the macro name through to output.
454 dump_definitions means pass the whole definition (plus #define) through
455*/
456
457 enum dump_type dump_macros;
458
459/* Nonzero means pass all #define and #undef directives which we actually
460 process through to the output stream. This feature is used primarily
461 to allow cc1 to record the #defines and #undefs for the sake of
462 debuggers which understand about preprocessor macros, but it may
463 also be useful with -E to figure out how symbols are defined, and
464 where they are defined. */
465 int debug_output;
466
467 /* Pending -D, -U and -A options, in reverse order. */
468 struct cpp_pending *pending;
469
470 /* File name which deps are being written to.
471 * This is 0 if deps are being written to stdout. */
472 char *deps_file;
473
474 /* Target-name to write with the dependency information. */
475 char *deps_target;
476};
477
478#define CPP_TRADITIONAL(PFILE) (CPP_OPTIONS(PFILE)-> traditional)
479#define CPP_PEDANTIC(PFILE) (CPP_OPTIONS (PFILE)->pedantic)
480#define CPP_PRINT_DEPS(PFILE) (CPP_OPTIONS (PFILE)->print_deps)
481
482/* Name under which this program was invoked. */
483
484extern char *progname;
485
486/* The structure of a node in the hash table. The hash table
487 has entries for all tokens defined by #define commands (type T_MACRO),
488 plus some special tokens like __LINE__ (these each have their own
489 type, and the appropriate code is run when that type of node is seen.
490 It does not contain control words like "#define", which are recognized
491 by a separate piece of code. */
492
493/* different flavors of hash nodes --- also used in keyword table */
494enum node_type {
495 T_DEFINE = 1, /* the `#define' keyword */
496 T_INCLUDE, /* the `#include' keyword */
497 T_INCLUDE_NEXT, /* the `#include_next' keyword */
498 T_IMPORT, /* the `#import' keyword */
499 T_IFDEF, /* the `#ifdef' keyword */
500 T_IFNDEF, /* the `#ifndef' keyword */
501 T_IF, /* the `#if' keyword */
502 T_ELSE, /* `#else' */
503 T_PRAGMA, /* `#pragma' */
504 T_ELIF, /* `#elif' */
505 T_UNDEF, /* `#undef' */
506 T_LINE, /* `#line' */
507 T_ERROR, /* `#error' */
508 T_WARNING, /* `#warning' */
509 T_ENDIF, /* `#endif' */
510 T_SCCS, /* `#sccs', used on system V. */
511 T_IDENT, /* `#ident', used on system V. */
512 T_ASSERT, /* `#assert', taken from system V. */
513 T_UNASSERT, /* `#unassert', taken from system V. */
514 T_SPECLINE, /* special symbol `__LINE__' */
515 T_DATE, /* `__DATE__' */
516 T_FILE, /* `__FILE__' */
517 T_BASE_FILE, /* `__BASE_FILE__' */
518 T_INCLUDE_LEVEL, /* `__INCLUDE_LEVEL__' */
519 T_VERSION, /* `__VERSION__' */
520 T_SIZE_TYPE, /* `__SIZE_TYPE__' */
521 T_PTRDIFF_TYPE, /* `__PTRDIFF_TYPE__' */
522 T_WCHAR_TYPE, /* `__WCHAR_TYPE__' */
523 T_USER_LABEL_PREFIX_TYPE, /* `__USER_LABEL_PREFIX__' */
524 T_REGISTER_PREFIX_TYPE, /* `__REGISTER_PREFIX__' */
525 T_TIME, /* `__TIME__' */
526 T_CONST, /* Constant value, used by `__STDC__' */
527 T_MACRO, /* macro defined by `#define' */
528 T_DISABLED, /* macro temporarily turned off for rescan */
529 T_SPEC_DEFINED, /* special `defined' macro for use in #if statements */
530 T_PCSTRING, /* precompiled string (hashval is KEYDEF *) */
531 T_UNUSED /* Used for something not defined. */
532};
533
534/* Structure allocated for every #define. For a simple replacement
535 such as
536 #define foo bar ,
537 nargs = -1, the `pattern' list is null, and the expansion is just
538 the replacement text. Nargs = 0 means a functionlike macro with no args,
539 e.g.,
540 #define getchar() getc (stdin) .
541 When there are args, the expansion is the replacement text with the
542 args squashed out, and the reflist is a list describing how to
543 build the output from the input: e.g., "3 chars, then the 1st arg,
544 then 9 chars, then the 3rd arg, then 0 chars, then the 2nd arg".
545 The chars here come from the expansion. Whatever is left of the
546 expansion after the last arg-occurrence is copied after that arg.
547 Note that the reflist can be arbitrarily long---
548 its length depends on the number of times the arguments appear in
549 the replacement text, not how many args there are. Example:
550 #define f(x) x+x+x+x+x+x+x would have replacement text "++++++" and
551 pattern list
552 { (0, 1), (1, 1), (1, 1), ..., (1, 1), NULL }
553 where (x, y) means (nchars, argno). */
554
555typedef struct reflist reflist;
556struct reflist {
557 reflist *next;
558 char stringify; /* nonzero if this arg was preceded by a
559 * # operator. */
560 char raw_before; /* Nonzero if a ## operator before arg. */
561 char raw_after; /* Nonzero if a ## operator after arg. */
562 char rest_args; /* Nonzero if this arg. absorbs the rest */
563 int nchars; /* Number of literal chars to copy before
564 * this arg occurrence. */
565 int argno; /* Number of arg to substitute (origin-0) */
566};
567
568typedef struct definition DEFINITION;
569struct definition {
570 int nargs;
571 int length; /* length of expansion string */
572 int predefined; /* True if the macro was builtin or */
573 /* came from the command line */
574 unsigned char *expansion;
575 int line; /* Line number of definition */
576 const char *file; /* File of definition */
577 char rest_args; /* Nonzero if last arg. absorbs the rest */
578 reflist *pattern;
579 union {
580 /* Names of macro args, concatenated in reverse order
581 * with comma-space between them.
582 * The only use of this is that we warn on redefinition
583 * if this differs between the old and new definitions. */
584 unsigned char *argnames;
585 } args;
586};
587
588extern unsigned char is_idchar[256];
589
590/* Stack of conditionals currently in progress
591 (including both successful and failing conditionals). */
592
593struct if_stack {
594 struct if_stack *next; /* for chaining to the next stack frame */
595 const char *fname; /* copied from input when frame is made */
596 int lineno; /* similarly */
597 int if_succeeded; /* true if a leg of this if-group
598 * has been passed through rescan */
599 unsigned char *control_macro; /* For #ifndef at start of file,
600 * this is the macro name tested. */
601 enum node_type type; /* type of last directive seen in this group */
602};
603typedef struct if_stack IF_STACK_FRAME;
604
605extern void cpp_buf_line_and_col(cpp_buffer *, long *, long *);
606extern cpp_buffer *cpp_file_buffer(cpp_reader *);
607extern void cpp_define(cpp_reader *, unsigned char *);
608
609extern void cpp_error(cpp_reader * pfile, const char *msg, ...);
610extern void cpp_warning(cpp_reader * pfile, const char *msg, ...);
611extern void cpp_pedwarn(cpp_reader * pfile, const char *msg, ...);
612extern void cpp_fatal(const char *msg, ...);
613extern void cpp_file_line_for_message(cpp_reader * pfile,
614 const char *filename, int line,
615 int column);
616extern void cpp_perror_with_name(cpp_reader * pfile, const char *name);
617extern void cpp_pfatal_with_name(cpp_reader * pfile, const char *name);
618extern void cpp_message(cpp_reader * pfile, int is_error,
619 const char *msg, ...);
620extern void cpp_message_v(cpp_reader * pfile, int is_error,
621 const char *msg, va_list args);
622
623extern void cpp_grow_buffer(cpp_reader * pfile, long n);
624extern int cpp_parse_escape(cpp_reader * pfile, char **string_ptr);
625
626void cpp_print_containing_files(cpp_reader * pfile);
627HOST_WIDE_INT cpp_parse_expr(cpp_reader * pfile);
628void skip_rest_of_line(cpp_reader * pfile);
629void init_parse_file(cpp_reader * pfile);
630void init_parse_options(struct cpp_options *opts);
631int push_parse_file(cpp_reader * pfile, const char *fname);
632void cpp_finish(cpp_reader * pfile);
633int cpp_read_check_assertion(cpp_reader * pfile);
634
635void *xmalloc(unsigned size);
636void *xrealloc(void *old, unsigned size);
637void *xcalloc(unsigned number, unsigned size);
638
639#ifdef __EMX__
640#define PATH_SEPARATOR ';'
641#endif