aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/tools/m4/src/m4.h
blob: eb2a96784ff9af1fe442a2b40eeea4b38aa326c7 (plain) (blame)
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
486
487
488
489
490
491
/* GNU m4 -- A simple macro processor

   Copyright (C) 1989-1994, 2004-2013 Free Software Foundation, Inc.

   This file is part of GNU M4.

   GNU M4 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 3 of the License, or
   (at your option) any later version.

   GNU M4 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, see <http://www.gnu.org/licenses/>.
*/

/* We use <config.h> instead of "config.h" so that a compilation
   using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
   (which it would do because it found this file in $srcdir).  */

#include <config.h>

#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "binary-io.h"
#include "clean-temp.h"
#include "cloexec.h"
#include "close-stream.h"
#include "closein.h"
#include "dirname.h"
#include "error.h"
#include "exitfail.h"
#include "filenamecat.h"
#include "obstack.h"
#include "stdio--.h"
#include "stdlib--.h"
#include "unistd--.h"
#include "verror.h"
#include "xalloc.h"
#include "xprintf.h"
#include "xvasprintf.h"

/* Canonicalize UNIX recognition macros.  */
#if defined unix || defined __unix || defined __unix__ \
  || defined _POSIX_VERSION || defined _POSIX2_VERSION \
  || defined __NetBSD__ || defined __OpenBSD__ \
  || defined __APPLE__ || defined __APPLE_CC__
# define UNIX 1
#endif

/* Canonicalize Windows recognition macros.  */
#if (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
# define W32_NATIVE 1
#endif

/* Canonicalize OS/2 recognition macro.  */
#ifdef __EMX__
# define OS2 1
# undef UNIX
#endif

/* Used if any programmer error is detected (not possible, right?)  */
#define EXIT_INTERNAL_ERROR 2

/* Used for version mismatch, when -R detects a frozen file it can't parse.  */
#define EXIT_MISMATCH 63

/* No-op, for future gettext compatibility.  */
#define _(ARG) ARG

/* Various declarations.  */

struct string
  {
    char *string;               /* characters of the string */
    size_t length;              /* length of the string */
  };
typedef struct string STRING;

/* Memory allocation.  */
#define obstack_chunk_alloc     xmalloc
#define obstack_chunk_free      free

/* Those must come first.  */
typedef struct token_data token_data;
typedef void builtin_func (struct obstack *, int, token_data **);

/* Gnulib's stdbool doesn't work with bool bitfields.  For nicer
   debugging, use bool when we know it works, but use the more
   portable unsigned int elsewhere.  */
#if __GNUC__ > 2
typedef bool bool_bitfield;
#else
typedef unsigned int bool_bitfield;
#endif /* ! __GNUC__ */

/* Take advantage of GNU C compiler source level optimization hints,
   using portable macros.  */
#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 6)
# define M4_GNUC_ATTRIBUTE(args)        __attribute__ (args)
#else
# define M4_GNUC_ATTRIBUTE(args)
#endif  /* __GNUC__ */

#define M4_GNUC_UNUSED          M4_GNUC_ATTRIBUTE ((__unused__))
#define M4_GNUC_PRINTF(fmt, arg)                        \
  M4_GNUC_ATTRIBUTE ((__format__ (__printf__, fmt, arg)))
#define M4_GNUC_NORETURN        M4_GNUC_ATTRIBUTE ((__noreturn__))
#define M4_GNUC_PURE            M4_GNUC_ATTRIBUTE ((__pure__))

/* File: m4.c  --- global definitions.  */

/* Option flags.  */
extern int sync_output;                 /* -s */
extern int debug_level;                 /* -d */
extern size_t hash_table_size;          /* -H */
extern int no_gnu_extensions;           /* -G */
extern int prefix_all_builtins;         /* -P */
extern int max_debug_argument_length;   /* -l */
extern int suppress_warnings;           /* -Q */
extern int warning_status;              /* -E */
extern int nesting_limit;               /* -L */
#ifdef ENABLE_CHANGEWORD
extern const char *user_word_regexp;    /* -W */
#endif

/* Error handling.  */
extern int retcode;

extern void m4_error (int, int, const char *, ...) M4_GNUC_PRINTF(3, 4);
extern void m4_error_at_line (int, int, const char *, int,
                              const char *, ...) M4_GNUC_PRINTF(5, 6);

#define M4ERROR(Arglist) (m4_error Arglist)
#define M4ERROR_AT_LINE(Arglist) (m4_error_at_line Arglist)


/* File: debug.c  --- debugging and tracing function.  */

extern FILE *debug;

/* The value of debug_level is a bitmask of the following.  */

/* a: show arglist in trace output */
#define DEBUG_TRACE_ARGS 1
/* e: show expansion in trace output */
#define DEBUG_TRACE_EXPANSION 2
/* q: quote args and expansion in trace output */
#define DEBUG_TRACE_QUOTE 4
/* t: trace all macros -- overrides trace{on,off} */
#define DEBUG_TRACE_ALL 8
/* l: add line numbers to trace output */
#define DEBUG_TRACE_LINE 16
/* f: add file name to trace output */
#define DEBUG_TRACE_FILE 32
/* p: trace path search of include files */
#define DEBUG_TRACE_PATH 64
/* c: show macro call before args collection */
#define DEBUG_TRACE_CALL 128
/* i: trace changes of input files */
#define DEBUG_TRACE_INPUT 256
/* x: add call id to trace output */
#define DEBUG_TRACE_CALLID 512

/* V: very verbose --  print everything */
#define DEBUG_TRACE_VERBOSE 1023
/* default flags -- equiv: aeq */
#define DEBUG_TRACE_DEFAULT 7

#define DEBUG_PRINT1(Fmt, Arg1) \
  do                                                            \
    {                                                           \
      if (debug != NULL)                                        \
        xfprintf (debug, Fmt, Arg1);                            \
    }                                                           \
  while (0)

#define DEBUG_PRINT3(Fmt, Arg1, Arg2, Arg3) \
  do                                                            \
    {                                                           \
      if (debug != NULL)                                        \
        xfprintf (debug, Fmt, Arg1, Arg2, Arg3);                \
    }                                                           \
  while (0)

#define DEBUG_MESSAGE(Fmt) \
  do                                                            \
    {                                                           \
      if (debug != NULL)                                        \
        {                                                       \
          debug_message_prefix ();                              \
          xfprintf (debug, Fmt);                                \
          putc ('\n', debug);                                   \
        }                                                       \
    }                                                           \
  while (0)

#define DEBUG_MESSAGE1(Fmt, Arg1) \
  do                                                            \
    {                                                           \
      if (debug != NULL)                                        \
        {                                                       \
          debug_message_prefix ();                              \
          xfprintf (debug, Fmt, Arg1);                          \
          putc ('\n', debug);                                   \
        }                                                       \
    }                                                           \
  while (0)

#define DEBUG_MESSAGE2(Fmt, Arg1, Arg2) \
  do                                                            \
    {                                                           \
      if (debug != NULL)                                        \
        {                                                       \
          debug_message_prefix ();                              \
          xfprintf (debug, Fmt, Arg1, Arg2);                    \
          putc ('\n', debug);                                   \
        }                                                       \
    }                                                           \
  while (0)

extern void debug_init (void);
extern int debug_decode (const char *);
extern void debug_flush_files (void);
extern bool debug_set_output (const char *);
extern void debug_message_prefix (void);

extern void trace_prepre (const char *, int);
extern void trace_pre (const char *, int, int, token_data **);
extern void trace_post (const char *, int, int, const char *);

/* File: input.c  --- lexical definitions.  */

/* Various different token types.  */
enum token_type
{
  TOKEN_EOF,                    /* end of file */
  TOKEN_STRING,                 /* a quoted string or comment */
  TOKEN_WORD,                   /* an identifier */
  TOKEN_OPEN,                   /* ( */
  TOKEN_COMMA,                  /* , */
  TOKEN_CLOSE,                  /* ) */
  TOKEN_SIMPLE,                 /* any other single character */
  TOKEN_MACDEF                  /* a macro's definition (see "defn") */
};

/* The data for a token, a macro argument, and a macro definition.  */
enum token_data_type
{
  TOKEN_VOID,
  TOKEN_TEXT,
  TOKEN_FUNC
};

struct token_data
{
  enum token_data_type type;
  union
    {
      struct
        {
          char *text;
#ifdef ENABLE_CHANGEWORD
          char *original_text;
#endif
        }
      u_t;
      builtin_func *func;
    }
  u;
};

#define TOKEN_DATA_TYPE(Td)             ((Td)->type)
#define TOKEN_DATA_TEXT(Td)             ((Td)->u.u_t.text)
#ifdef ENABLE_CHANGEWORD
# define TOKEN_DATA_ORIG_TEXT(Td)       ((Td)->u.u_t.original_text)
#endif
#define TOKEN_DATA_FUNC(Td)             ((Td)->u.func)

typedef enum token_type token_type;
typedef enum token_data_type token_data_type;

extern void input_init (void);
extern token_type peek_token (void);
extern token_type next_token (token_data *, int *);
extern void skip_line (void);

/* push back input */
extern void push_file (FILE *, const char *, bool);
extern void push_macro (builtin_func *);
extern struct obstack *push_string_init (void);
extern const char *push_string_finish (void);
extern void push_wrapup (const char *);
extern bool pop_wrapup (void);

/* current input file, and line */
extern const char *current_file;
extern int current_line;

/* left and right quote, begin and end comment */
extern STRING bcomm;
extern STRING ecomm;
extern STRING lquote;
extern STRING rquote;

#define DEF_LQUOTE "`"
#define DEF_RQUOTE "\'"
#define DEF_BCOMM "#"
#define DEF_ECOMM "\n"

extern void set_quotes (const char *, const char *);
extern void set_comment (const char *, const char *);
#ifdef ENABLE_CHANGEWORD
extern void set_word_regexp (const char *);
#endif

/* File: output.c --- output functions.  */
extern int current_diversion;
extern int output_current_line;

extern void output_init (void);
extern void output_exit (void);
extern void output_text (const char *, int);
extern void shipout_text (struct obstack *, const char *, int, int);
extern void make_diversion (int);
extern void insert_diversion (int);
extern void insert_file (FILE *);
extern void freeze_diversions (FILE *);

/* File symtab.c  --- symbol table definitions.  */

/* Operation modes for lookup_symbol ().  */
enum symbol_lookup
{
  SYMBOL_LOOKUP,
  SYMBOL_INSERT,
  SYMBOL_DELETE,
  SYMBOL_PUSHDEF,
  SYMBOL_POPDEF
};

/* Symbol table entry.  */
struct symbol
{
  struct symbol *next;
  bool_bitfield traced : 1;
  bool_bitfield shadowed : 1;
  bool_bitfield macro_args : 1;
  bool_bitfield blind_no_args : 1;
  bool_bitfield deleted : 1;
  int pending_expansions;

  char *name;
  token_data data;
};

#define SYMBOL_NEXT(S)          ((S)->next)
#define SYMBOL_TRACED(S)        ((S)->traced)
#define SYMBOL_SHADOWED(S)      ((S)->shadowed)
#define SYMBOL_MACRO_ARGS(S)    ((S)->macro_args)
#define SYMBOL_BLIND_NO_ARGS(S) ((S)->blind_no_args)
#define SYMBOL_DELETED(S)       ((S)->deleted)
#define SYMBOL_PENDING_EXPANSIONS(S) ((S)->pending_expansions)
#define SYMBOL_NAME(S)          ((S)->name)
#define SYMBOL_TYPE(S)          (TOKEN_DATA_TYPE (&(S)->data))
#define SYMBOL_TEXT(S)          (TOKEN_DATA_TEXT (&(S)->data))
#define SYMBOL_FUNC(S)          (TOKEN_DATA_FUNC (&(S)->data))

typedef enum symbol_lookup symbol_lookup;
typedef struct symbol symbol;
typedef void hack_symbol (symbol *, void *);

#define HASHMAX 509             /* default, overridden by -Hsize */

extern symbol **symtab;

extern void free_symbol (symbol *sym);
extern void symtab_init (void);
extern symbol *lookup_symbol (const char *, symbol_lookup);
extern void hack_all_symbols (hack_symbol *, void *);

/* File: macro.c  --- macro expansion.  */

extern int expansion_level;

extern void expand_input (void);
extern void call_macro (symbol *, int, token_data **, struct obstack *);

/* File: builtin.c  --- builtins.  */

struct builtin
{
  const char *name;
  bool_bitfield gnu_extension : 1;
  bool_bitfield groks_macro_args : 1;
  bool_bitfield blind_if_no_args : 1;
  builtin_func *func;
};

struct predefined
{
  const char *unix_name;
  const char *gnu_name;
  const char *func;
};

typedef struct builtin builtin;
typedef struct predefined predefined;
struct re_pattern_buffer;
struct re_registers;

/* The default sequence detects multi-digit parameters (obsolete after
   1.4.x), and any use of extended arguments with the default ${}
   syntax (new in 2.0).  */
#define DEFAULT_MACRO_SEQUENCE "\\$\\({[^}]*}\\|[0-9][0-9]+\\)"

extern void builtin_init (void);
extern void define_builtin (const char *, const builtin *, symbol_lookup);
extern void set_macro_sequence (const char *);
extern void free_macro_sequence (void);
extern void define_user_macro (const char *, const char *, symbol_lookup);
extern void undivert_all (void);
extern void expand_user_macro (struct obstack *, symbol *, int, token_data **);
extern void m4_placeholder (struct obstack *, int, token_data **);
extern void init_pattern_buffer (struct re_pattern_buffer *,
                                 struct re_registers *);
extern const char *ntoa (int32_t, int);

extern const builtin *find_builtin_by_addr (builtin_func *);
extern const builtin *find_builtin_by_name (const char *);

/* File: path.c  --- path search for include files.  */

extern void include_init (void);
extern void include_env_init (void);
extern void add_include_directory (const char *);
extern FILE *m4_path_search (const char *, char **);

/* File: eval.c  --- expression evaluation.  */

extern bool evaluate (const char *, int32_t *);

/* File: format.c  --- printf like formatting.  */

extern void expand_format (struct obstack *, int, token_data **);

/* File: freeze.c --- frozen state files.  */

extern void produce_frozen_state (const char *);
extern void reload_frozen_state (const char *);

/* Debugging the memory allocator.  */

#ifdef WITH_DMALLOC
# define DMALLOC_FUNC_CHECK
# include <dmalloc.h>
#endif

/* Other debug stuff.  */

#ifdef DEBUG
# define DEBUG_INCL   1
# define DEBUG_INPUT  1
# define DEBUG_MACRO  1
# define DEBUG_OUTPUT 1
# define DEBUG_STKOVF 1
# define DEBUG_SYM    1
#endif

/* Convert a possibly-signed character to an unsigned character.  This is
   a bit safer than casting to unsigned char, since it catches some type
   errors that the cast doesn't.  */
#if HAVE_INLINE
static inline unsigned char to_uchar (char ch) { return ch; }
#else
# define to_uchar(C) ((unsigned char) (C))
#endif

/* Avoid negative logic when comparing two strings.  */
#define STREQ(a, b) (strcmp (a, b) == 0)