summaryrefslogtreecommitdiffstats
path: root/contrib/gcc/cpphash.h
blob: 03de93f9644e42c55d9c25712669929d611f814c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
/* Part of CPP library.
   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002
   Free Software Foundation, Inc.

This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* This header defines all the internal data structures and functions
   that need to be visible across files.  It's called cpphash.h for
   historical reasons.  */

#ifndef GCC_CPPHASH_H
#define GCC_CPPHASH_H

#include "hashtable.h"

struct directive;		/* Deliberately incomplete.  */

/* Test if a sign is valid within a preprocessing number.  */
#define VALID_SIGN(c, prevc) \
  (((c) == '+' || (c) == '-') && \
   ((prevc) == 'e' || (prevc) == 'E' \
    || (((prevc) == 'p' || (prevc) == 'P') \
        && CPP_OPTION (pfile, extended_numbers))))

#define CPP_OPTION(PFILE, OPTION) ((PFILE)->opts.OPTION)
#define CPP_BUFFER(PFILE) ((PFILE)->buffer)
#define CPP_BUF_COLUMN(BUF, CUR) ((CUR) - (BUF)->line_base + (BUF)->col_adjust)
#define CPP_BUF_COL(BUF) CPP_BUF_COLUMN(BUF, (BUF)->cur)

/* Maximum nesting of cpp_buffers.  We use a static limit, partly for
   efficiency, and partly to limit runaway recursion.  */
#define CPP_STACK_MAX 200

/* A generic memory buffer, and operations on it.  */
typedef struct _cpp_buff _cpp_buff;
struct _cpp_buff
{
  struct _cpp_buff *next;
  unsigned char *base, *cur, *limit;
};

extern _cpp_buff *_cpp_get_buff PARAMS ((cpp_reader *, size_t));
extern void _cpp_release_buff PARAMS ((cpp_reader *, _cpp_buff *));
extern void _cpp_extend_buff PARAMS ((cpp_reader *, _cpp_buff **, size_t));
extern _cpp_buff *_cpp_append_extend_buff PARAMS ((cpp_reader *, _cpp_buff *,
						   size_t));
extern void _cpp_free_buff PARAMS ((_cpp_buff *));
extern unsigned char *_cpp_aligned_alloc PARAMS ((cpp_reader *, size_t));
extern unsigned char *_cpp_unaligned_alloc PARAMS ((cpp_reader *, size_t));

#define BUFF_ROOM(BUFF) (size_t) ((BUFF)->limit - (BUFF)->cur)
#define BUFF_FRONT(BUFF) ((BUFF)->cur)
#define BUFF_LIMIT(BUFF) ((BUFF)->limit)

/* List of directories to look for include files in.  */
struct search_path
{
  struct search_path *next;

  /* NOTE: NAME may not be null terminated for the case of the current
     file's directory!  */
  const char *name;
  unsigned int len;
  /* We use these to tell if the directory mentioned here is a duplicate
     of an earlier directory on the search path.  */
  ino_t ino;
  dev_t dev;
  /* Non-zero if it is a system include directory.  */
  int sysp;
  /* Mapping of file names for this directory.  Only used on MS-DOS
     and related platforms.  */
  struct file_name_map *name_map;
};

/* #include types.  */
enum include_type {IT_INCLUDE, IT_INCLUDE_NEXT, IT_IMPORT, IT_CMDLINE};

union utoken
{
  const cpp_token *token;
  const cpp_token **ptoken;
};

/* A "run" of tokens; part of a chain of runs.  */
typedef struct tokenrun tokenrun;
struct tokenrun
{
  tokenrun *next, *prev;
  cpp_token *base, *limit;
};

typedef struct cpp_context cpp_context;
struct cpp_context
{
  /* Doubly-linked list.  */
  cpp_context *next, *prev;

  /* Contexts other than the base context are contiguous tokens.
     e.g. macro expansions, expanded argument tokens.  */
  union utoken first;
  union utoken last;

  /* If non-NULL, a buffer used for storage related to this context.
     When the context is popped, the buffer is released.  */
  _cpp_buff *buff;

  /* For a macro context, the macro node, otherwise NULL.  */
  cpp_hashnode *macro;

  /* True if utoken element is token, else ptoken.  */
  bool direct_p;
};

struct lexer_state
{
  /* Nonzero if first token on line is CPP_HASH.  */
  unsigned char in_directive;

  /* True if we are skipping a failed conditional group.  */
  unsigned char skipping;

  /* Nonzero if in a directive that takes angle-bracketed headers.  */
  unsigned char angled_headers;

  /* Nonzero to save comments.  Turned off if discard_comments, and in
     all directives apart from #define.  */
  unsigned char save_comments;

  /* Nonzero if we're mid-comment.  */
  unsigned char lexing_comment;

  /* Nonzero if lexing __VA_ARGS__ is valid.  */
  unsigned char va_args_ok;

  /* Nonzero if lexing poisoned identifiers is valid.  */
  unsigned char poisoned_ok;

  /* Nonzero to prevent macro expansion.  */
  unsigned char prevent_expansion;  

  /* Nonzero when parsing arguments to a function-like macro.  */
  unsigned char parsing_args;
};

/* Special nodes - identifiers with predefined significance.  */
struct spec_nodes
{
  cpp_hashnode *n_defined;		/* defined operator */
  cpp_hashnode *n_true;			/* C++ keyword true */
  cpp_hashnode *n_false;		/* C++ keyword false */
  cpp_hashnode *n__STRICT_ANSI__;	/* STDC_0_IN_SYSTEM_HEADERS */
  cpp_hashnode *n__VA_ARGS__;		/* C99 vararg macros */
};

/* Represents the contents of a file cpplib has read in.  */
struct cpp_buffer
{
  const unsigned char *cur;	 /* current position */
  const unsigned char *backup_to; /* if peeked character is not wanted */
  const unsigned char *rlimit; /* end of valid data */
  const unsigned char *line_base; /* start of current line */

  struct cpp_buffer *prev;

  const unsigned char *buf;	 /* Entire character buffer.  */

  /* Pointer into the include table; non-NULL if this is a file
     buffer.  Used for include_next and to record control macros.  */
  struct include_file *inc;

  /* Value of if_stack at start of this file.
     Used to prohibit unmatched #endif (etc) in an include file.  */
  struct if_stack *if_stack;

  /* Token column position adjustment owing to tabs in whitespace.  */
  unsigned int col_adjust;

  /* Contains PREV_WHITE and/or AVOID_LPASTE.  */
  unsigned char saved_flags;

  /* Because of the way the lexer works, -Wtrigraphs can sometimes
     warn twice for the same trigraph.  This helps prevent that.  */
  const unsigned char *last_Wtrigraphs;

  /* True if we have already warned about C++ comments in this file.
     The warning happens only for C89 extended mode with -pedantic on,
     or for -Wtraditional, and only once per file (otherwise it would
     be far too noisy).  */
  unsigned char warned_cplusplus_comments;

  /* True if we don't process trigraphs and escaped newlines.  True
     for preprocessed input, command line directives, and _Pragma
     buffers.  */
  unsigned char from_stage3;

  /* Nonzero means that the directory to start searching for ""
     include files has been calculated and stored in "dir" below.  */
  unsigned char search_cached;

  /* At EOF, a buffer is automatically popped.  If RETURN_AT_EOF is
     true, a CPP_EOF token is then returned.  Otherwise, the next
     token from the enclosing buffer is returned.  */
  bool return_at_eof;

  /* The directory of the this buffer's file.  Its NAME member is not
     allocated, so we don't need to worry about freeing it.  */
  struct search_path dir;
};

/* A cpp_reader encapsulates the "state" of a pre-processor run.
   Applying cpp_get_token repeatedly yields a stream of pre-processor
   tokens.  Usually, there is only one cpp_reader object active.  */
struct cpp_reader
{
  /* Top of buffer stack.  */
  cpp_buffer *buffer;

  /* Lexer state.  */
  struct lexer_state state;

  /* Source line tracking.  */
  struct line_maps line_maps;
  const struct line_map *map;
  unsigned int line;

  /* The line of the '#' of the current directive.  */
  unsigned int directive_line;

  /* Memory buffers.  */
  _cpp_buff *a_buff;		/* Aligned permanent storage.  */
  _cpp_buff *u_buff;		/* Unaligned permanent storage.  */
  _cpp_buff *free_buffs;	/* Free buffer chain.  */

  /* Context stack.  */
  struct cpp_context base_context;
  struct cpp_context *context;

  /* If in_directive, the directive if known.  */
  const struct directive *directive;

  /* Multiple inlcude optimisation.  */
  const cpp_hashnode *mi_cmacro;
  const cpp_hashnode *mi_ind_cmacro;
  bool mi_valid;

  /* Lexing.  */
  cpp_token *cur_token;
  tokenrun base_run, *cur_run;
  unsigned int lookaheads;

  /* Non-zero prevents the lexer from re-using the token runs.  */
  unsigned int keep_tokens;

  /* Error counter for exit code.  */
  unsigned int errors;

  /* Line and column where a newline was first seen in a string
     constant (multi-line strings).  */
  unsigned int mls_line;
  unsigned int mls_col;

  /* Buffer to hold macro definition string.  */
  unsigned char *macro_buffer;
  unsigned int macro_buffer_len;

  /* Tree of other included files.  See cppfiles.c.  */
  struct splay_tree_s *all_include_files;

  /* Current maximum length of directory names in the search path
     for include files.  (Altered as we get more of them.)  */
  unsigned int max_include_len;

  /* Date and time tokens.  Calculated together if either is requested.  */
  cpp_token date;
  cpp_token time;

  /* EOF token, and a token forcing paste avoidance.  */
  cpp_token avoid_paste;
  cpp_token eof;

  /* Opaque handle to the dependencies of mkdeps.c.  Used by -M etc.  */
  struct deps *deps;

  /* Obstack holding all macro hash nodes.  This never shrinks.
     See cpphash.c */
  struct obstack hash_ob;

  /* Obstack holding buffer and conditional structures.  This is a
     real stack.  See cpplib.c.  */
  struct obstack buffer_ob;

  /* Pragma table - dynamic, because a library user can add to the
     list of recognized pragmas.  */
  struct pragma_entry *pragmas;

  /* Call backs.  */
  struct cpp_callbacks cb;

  /* Identifier hash table.  */ 
  struct ht *hash_table;

  /* User visible options.  */
  struct cpp_options opts;

  /* Special nodes - identifiers with predefined significance to the
     preprocessor.  */
  struct spec_nodes spec_nodes;

  /* Whether to print our version number.  Done this way so
     we don't get it twice for -v -version.  */
  unsigned char print_version;

  /* Whether cpplib owns the hashtable.  */
  unsigned char our_hashtable;
};

/* Character classes.  Based on the more primitive macros in safe-ctype.h.
   If the definition of `numchar' looks odd to you, please look up the
   definition of a pp-number in the C standard [section 6.4.8 of C99].

   In the unlikely event that characters other than \r and \n enter
   the set is_vspace, the macro handle_newline() in cpplex.c must be
   updated.  */
#define _dollar_ok(x)	((x) == '$' && CPP_OPTION (pfile, dollars_in_ident))

#define is_idchar(x)	(ISIDNUM(x) || _dollar_ok(x))
#define is_numchar(x)	ISIDNUM(x)
#define is_idstart(x)	(ISIDST(x) || _dollar_ok(x))
#define is_numstart(x)	ISDIGIT(x)
#define is_hspace(x)	ISBLANK(x)
#define is_vspace(x)	IS_VSPACE(x)
#define is_nvspace(x)	IS_NVSPACE(x)
#define is_space(x)	IS_SPACE_OR_NUL(x)

/* This table is constant if it can be initialized at compile time,
   which is the case if cpp was compiled with GCC >=2.7, or another
   compiler that supports C99.  */
#if HAVE_DESIGNATED_INITIALIZERS
extern const unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
#else
extern unsigned char _cpp_trigraph_map[UCHAR_MAX + 1];
#endif

/* Macros.  */

#define CPP_PRINT_DEPS(PFILE) CPP_OPTION (PFILE, print_deps)
#define CPP_IN_SYSTEM_HEADER(PFILE) ((PFILE)->map && (PFILE)->map->sysp)
#define CPP_PEDANTIC(PF) CPP_OPTION (PF, pedantic)
#define CPP_WTRADITIONAL(PF) CPP_OPTION (PF, warn_traditional)

/* In cpperror.c  */
enum error_type { WARNING = 0, WARNING_SYSHDR, PEDWARN, ERROR, FATAL, ICE };
extern int _cpp_begin_message PARAMS ((cpp_reader *, enum error_type,
				       unsigned int, unsigned int));

/* In cppmacro.c */
extern void _cpp_free_definition	PARAMS ((cpp_hashnode *));
extern int _cpp_create_definition	PARAMS ((cpp_reader *, cpp_hashnode *));
extern void _cpp_pop_context		PARAMS ((cpp_reader *));

/* In cpphash.c */
extern void _cpp_init_hashtable		PARAMS ((cpp_reader *, hash_table *));
extern void _cpp_destroy_hashtable	PARAMS ((cpp_reader *));

/* In cppfiles.c */
extern void _cpp_fake_include		PARAMS ((cpp_reader *, const char *));
extern void _cpp_never_reread		PARAMS ((struct include_file *));
extern char *_cpp_simplify_pathname	PARAMS ((char *));
extern bool _cpp_read_file		PARAMS ((cpp_reader *, const char *));
extern bool _cpp_execute_include	PARAMS ((cpp_reader *,
						 const cpp_token *,
						 enum include_type));
extern int _cpp_compare_file_date       PARAMS ((cpp_reader *,
						 const cpp_token *));
extern void _cpp_report_missing_guards	PARAMS ((cpp_reader *));
extern void _cpp_init_includes		PARAMS ((cpp_reader *));
extern void _cpp_cleanup_includes	PARAMS ((cpp_reader *));
extern bool _cpp_pop_file_buffer	PARAMS ((cpp_reader *,
						 struct include_file *));

/* In cppexp.c */
extern int _cpp_parse_expr		PARAMS ((cpp_reader *));

/* In cpplex.c */
extern cpp_token *_cpp_temp_token	PARAMS ((cpp_reader *));
extern const cpp_token *_cpp_lex_token	PARAMS ((cpp_reader *));
extern cpp_token *_cpp_lex_direct	PARAMS ((cpp_reader *));
extern int _cpp_equiv_tokens		PARAMS ((const cpp_token *,
						 const cpp_token *));
extern void _cpp_init_tokenrun		PARAMS ((tokenrun *, unsigned int));

/* In cppinit.c.  */
extern bool _cpp_push_next_buffer	PARAMS ((cpp_reader *));

/* In cpplib.c */
extern int _cpp_test_assertion PARAMS ((cpp_reader *, int *));
extern int _cpp_handle_directive PARAMS ((cpp_reader *, int));
extern void _cpp_define_builtin	PARAMS ((cpp_reader *, const char *));
extern void _cpp_do__Pragma	PARAMS ((cpp_reader *));
extern void _cpp_init_directives PARAMS ((cpp_reader *));
extern void _cpp_init_internal_pragmas PARAMS ((cpp_reader *));
extern void _cpp_do_file_change PARAMS ((cpp_reader *, enum lc_reason,
					 const char *,
					 unsigned int, unsigned int));
extern void _cpp_pop_buffer PARAMS ((cpp_reader *));

/* Utility routines and macros.  */
#define DSC(str) (const U_CHAR *)str, sizeof str - 1
#define xnew(T)		(T *) xmalloc (sizeof(T))
#define xcnew(T)	(T *) xcalloc (1, sizeof(T))
#define xnewvec(T, N)	(T *) xmalloc (sizeof(T) * (N))
#define xcnewvec(T, N)	(T *) xcalloc (N, sizeof(T))
#define xobnew(O, T)	(T *) obstack_alloc (O, sizeof(T))

/* These are inline functions instead of macros so we can get type
   checking.  */
typedef unsigned char U_CHAR;
#define U (const U_CHAR *)  /* Intended use: U"string" */

static inline int ustrcmp	PARAMS ((const U_CHAR *, const U_CHAR *));
static inline int ustrncmp	PARAMS ((const U_CHAR *, const U_CHAR *,
					 size_t));
static inline size_t ustrlen	PARAMS ((const U_CHAR *));
static inline U_CHAR *uxstrdup	PARAMS ((const U_CHAR *));
static inline U_CHAR *ustrchr	PARAMS ((const U_CHAR *, int));
static inline int ufputs	PARAMS ((const U_CHAR *, FILE *));

static inline int
ustrcmp (s1, s2)
     const U_CHAR *s1, *s2;
{
  return strcmp ((const char *)s1, (const char *)s2);
}

static inline int
ustrncmp (s1, s2, n)
     const U_CHAR *s1, *s2;
     size_t n;
{
  return strncmp ((const char *)s1, (const char *)s2, n);
}

static inline size_t
ustrlen (s1)
     const U_CHAR *s1;
{
  return strlen ((const char *)s1);
}

static inline U_CHAR *
uxstrdup (s1)
     const U_CHAR *s1;
{
  return (U_CHAR *) xstrdup ((const char *)s1);
}

static inline U_CHAR *
ustrchr (s1, c)
     const U_CHAR *s1;
     int c;
{
  return (U_CHAR *) strchr ((const char *)s1, c);
}

static inline int
ufputs (s, f)
     const U_CHAR *s;
     FILE *f;
{
  return fputs ((const char *)s, f);
}

#endif /* ! GCC_CPPHASH_H */
OpenPOWER on IntegriCloud