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
|
/* GNU m4 -- A simple macro processor
Copyright (C) 1989-1994, 2006-2014, 2016 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/>.
*/
/* This module handles frozen files. */
#include "m4.h"
/*-------------------------------------------------------------------.
| Destructively reverse a symbol list and return the reversed list. |
`-------------------------------------------------------------------*/
static symbol *
reverse_symbol_list (symbol *sym)
{
symbol *result;
symbol *next;
result = NULL;
while (sym)
{
next = SYMBOL_NEXT (sym);
SYMBOL_NEXT (sym) = result;
result = sym;
sym = next;
}
return result;
}
/*------------------------------------------------.
| Produce a frozen state to the given file NAME. |
`------------------------------------------------*/
void
produce_frozen_state (const char *name)
{
FILE *file;
size_t h;
symbol *sym;
const builtin *bp;
file = fopen (name, O_BINARY ? "wb" : "w");
if (!file)
{
M4ERROR ((EXIT_FAILURE, errno, "cannot open `%s'", name));
return;
}
/* Write a recognizable header. */
xfprintf (file, "# This is a frozen state file generated by %s\n",
PACKAGE_STRING);
xfprintf (file, "V1\n");
/* Dump quote delimiters. */
if (strcmp (lquote.string, DEF_LQUOTE) || strcmp (rquote.string, DEF_RQUOTE))
{
xfprintf (file, "Q%d,%d\n", (int) lquote.length, (int) rquote.length);
fputs (lquote.string, file);
fputs (rquote.string, file);
fputc ('\n', file);
}
/* Dump comment delimiters. */
if (strcmp (bcomm.string, DEF_BCOMM) || strcmp (ecomm.string, DEF_ECOMM))
{
xfprintf (file, "C%d,%d\n", (int) bcomm.length, (int) ecomm.length);
fputs (bcomm.string, file);
fputs (ecomm.string, file);
fputc ('\n', file);
}
/* Dump all symbols. */
for (h = 0; h < hash_table_size; h++)
{
/* Process all entries in one bucket, from the last to the first.
This order ensures that, at reload time, pushdef's will be
executed with the oldest definitions first. */
symtab[h] = reverse_symbol_list (symtab[h]);
for (sym = symtab[h]; sym; sym = SYMBOL_NEXT (sym))
{
switch (SYMBOL_TYPE (sym))
{
case TOKEN_TEXT:
xfprintf (file, "T%d,%d\n",
(int) strlen (SYMBOL_NAME (sym)),
(int) strlen (SYMBOL_TEXT (sym)));
fputs (SYMBOL_NAME (sym), file);
fputs (SYMBOL_TEXT (sym), file);
fputc ('\n', file);
break;
case TOKEN_FUNC:
bp = find_builtin_by_addr (SYMBOL_FUNC (sym));
if (bp == NULL)
{
M4ERROR ((warning_status, 0, "\
INTERNAL ERROR: builtin not found in builtin table!"));
abort ();
}
xfprintf (file, "F%d,%d\n",
(int) strlen (SYMBOL_NAME (sym)),
(int) strlen (bp->name));
fputs (SYMBOL_NAME (sym), file);
fputs (bp->name, file);
fputc ('\n', file);
break;
case TOKEN_VOID:
/* Ignore placeholder tokens that exist due to traceon. */
break;
default:
M4ERROR ((warning_status, 0, "\
INTERNAL ERROR: bad token data type in freeze_one_symbol ()"));
abort ();
break;
}
}
/* Reverse the bucket once more, putting it back as it was. */
symtab[h] = reverse_symbol_list (symtab[h]);
}
/* Let diversions be issued from output.c module, its cleaner to have this
piece of code there. */
freeze_diversions (file);
/* All done. */
fputs ("# End of frozen state file\n", file);
if (close_stream (file) != 0)
M4ERROR ((EXIT_FAILURE, errno, "unable to create frozen state"));
}
/*----------------------------------------------------------------------.
| Issue a message saying that some character is an EXPECTED character. |
`----------------------------------------------------------------------*/
static void
issue_expect_message (int expected)
{
if (expected == '\n')
M4ERROR ((EXIT_FAILURE, 0, "expecting line feed in frozen file"));
else
M4ERROR ((EXIT_FAILURE, 0, "expecting character `%c' in frozen file",
expected));
}
/*-------------------------------------------------.
| Reload a frozen state from the given file NAME. |
`-------------------------------------------------*/
/* We are seeking speed, here. */
void
reload_frozen_state (const char *name)
{
FILE *file;
int character;
int operation;
char *string[2];
int allocated[2];
int number[2];
const builtin *bp;
bool advance_line = true;
#define GET_CHARACTER \
do \
{ \
if (advance_line) \
{ \
current_line++; \
advance_line = false; \
} \
(character = getc (file)); \
if (character == '\n') \
advance_line = true; \
} \
while (0)
#define GET_NUMBER(Number, AllowNeg) \
do \
{ \
unsigned int n = 0; \
while (isdigit (character) && n <= INT_MAX / 10U) \
{ \
n = 10 * n + character - '0'; \
GET_CHARACTER; \
} \
if (((AllowNeg) ? INT_MIN : INT_MAX) + 0U < n \
|| isdigit (character)) \
m4_error (EXIT_FAILURE, 0, \
_("integer overflow in frozen file")); \
(Number) = n; \
} \
while (0)
#define VALIDATE(Expected) \
do \
{ \
if (character != (Expected)) \
issue_expect_message (Expected); \
} \
while (0)
/* Skip comments (`#' at beginning of line) and blank lines, setting
character to the next directive or to EOF. */
#define GET_DIRECTIVE \
do \
{ \
GET_CHARACTER; \
if (character == '#') \
{ \
while (character != EOF && character != '\n') \
GET_CHARACTER; \
VALIDATE ('\n'); \
} \
} \
while (character == '\n')
#define GET_STRING(i) \
do \
{ \
void *tmp; \
char *p; \
if (number[(i)] + 1 > allocated[(i)]) \
{ \
free (string[(i)]); \
allocated[(i)] = number[(i)] + 1; \
string[(i)] = xcharalloc ((size_t) allocated[(i)]); \
} \
if (number[(i)] > 0 \
&& !fread (string[(i)], (size_t) number[(i)], 1, file)) \
m4_error (EXIT_FAILURE, 0, \
_("premature end of frozen file")); \
string[(i)][number[(i)]] = '\0'; \
p = string[(i)]; \
while ((tmp = memchr(p, '\n', number[(i)] - (p - string[(i)])))) \
{ \
current_line++; \
p = (char *) tmp + 1; \
} \
} \
while (0)
file = m4_path_search (name, NULL);
if (file == NULL)
M4ERROR ((EXIT_FAILURE, errno, "cannot open %s", name));
current_file = name;
allocated[0] = 100;
string[0] = xcharalloc ((size_t) allocated[0]);
allocated[1] = 100;
string[1] = xcharalloc ((size_t) allocated[1]);
/* Validate format version. Only `1' is acceptable for now. */
GET_DIRECTIVE;
VALIDATE ('V');
GET_CHARACTER;
GET_NUMBER (number[0], false);
if (number[0] > 1)
M4ERROR ((EXIT_MISMATCH, 0,
"frozen file version %d greater than max supported of 1",
number[0]));
else if (number[0] < 1)
M4ERROR ((EXIT_FAILURE, 0,
"ill-formed frozen file, version directive expected"));
VALIDATE ('\n');
GET_DIRECTIVE;
while (character != EOF)
{
switch (character)
{
default:
M4ERROR ((EXIT_FAILURE, 0, "ill-formed frozen file"));
case 'C':
case 'D':
case 'F':
case 'T':
case 'Q':
operation = character;
GET_CHARACTER;
/* Get string lengths. Accept a negative diversion number. */
if (operation == 'D' && character == '-')
{
GET_CHARACTER;
GET_NUMBER (number[0], true);
number[0] = -number[0];
}
else
GET_NUMBER (number[0], false);
VALIDATE (',');
GET_CHARACTER;
GET_NUMBER (number[1], false);
VALIDATE ('\n');
if (operation != 'D')
GET_STRING (0);
GET_STRING (1);
GET_CHARACTER;
VALIDATE ('\n');
/* Act according to operation letter. */
switch (operation)
{
case 'C':
/* Change comment strings. */
set_comment (string[0], string[1]);
break;
case 'D':
/* Select a diversion and add a string to it. */
make_diversion (number[0]);
if (number[1] > 0)
output_text (string[1], number[1]);
break;
case 'F':
/* Enter a macro having a builtin function as a definition. */
bp = find_builtin_by_name (string[1]);
define_builtin (string[0], bp, SYMBOL_PUSHDEF);
break;
case 'T':
/* Enter a macro having an expansion text as a definition. */
define_user_macro (string[0], string[1], SYMBOL_PUSHDEF);
break;
case 'Q':
/* Change quote strings. */
set_quotes (string[0], string[1]);
break;
default:
/* Cannot happen. */
break;
}
break;
}
GET_DIRECTIVE;
}
free (string[0]);
free (string[1]);
if (close_stream (file) != 0)
m4_error (EXIT_FAILURE, errno, _("unable to read frozen state"));
current_file = NULL;
current_line = 0;
#undef GET_CHARACTER
#undef GET_DIRECTIVE
#undef GET_NUMBER
#undef VALIDATE
#undef GET_STRING
}
|
