aboutsummaryrefslogtreecommitdiff
path: root/file.c
blob: 82e7442cd66d77ecdd87a0cf2bb21f996554f4e9 (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
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
/* Target file hash table management for GNU Make.
Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 1995 Free Software Foundation, Inc.
This file is part of GNU Make.

GNU Make 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.

GNU Make 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 GNU Make; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include "make.h"
#include "commands.h"
#include "dep.h"
#include "file.h"
#include "variable.h"
#include <assert.h>


/* Hash table of files the makefile knows how to make.  */

#ifndef	FILE_BUCKETS
#define FILE_BUCKETS	1007
#endif
static struct file *files[FILE_BUCKETS];

/* Number of files with the `intermediate' flag set.  */

unsigned int num_intermediates = 0;


/* Access the hash table of all file records.
   lookup_file  given a name, return the struct file * for that name,
           or nil if there is none.
   enter_file   similar, but create one if there is none.  */

struct file *
lookup_file (name)
     char *name;
{
  register struct file *f;
  register char *n;
  register unsigned int hashval;

  if (*name == '\0')
    abort ();

  /* This is also done in parse_file_seq, so this is redundant
     for names read from makefiles.  It is here for names passed
     on the command line.  */
  while (name[0] == '.' && name[1] == '/' && name[2] != '\0')
    {
      name += 2;
      while (*name == '/')
	/* Skip following slashes: ".//foo" is "foo", not "/foo".  */
	++name;
    }

  if (*name == '\0')
    /* It was all slashes after a dot.  */
    name = "./";

  hashval = 0;
  for (n = name; *n != '\0'; ++n)
    HASH (hashval, *n);
  hashval %= FILE_BUCKETS;

  for (f = files[hashval]; f != 0; f = f->next)
    if (streq (f->name, name))
      return f;
  return 0;
}

struct file *
enter_file (name)
     char *name;
{
  register struct file *f, *new;
  register char *n;
  register unsigned int hashval;

  if (*name == '\0')
    abort ();

  hashval = 0;
  for (n = name; *n != '\0'; ++n)
    HASH (hashval, *n);
  hashval %= FILE_BUCKETS;

  for (f = files[hashval]; f != 0; f = f->next)
    if (streq (f->name, name))
      break;

  if (f != 0 && !f->double_colon)
    return f;

  new = (struct file *) xmalloc (sizeof (struct file));
  bzero ((char *) new, sizeof (struct file));
  new->name = name;
  new->update_status = -1;

  if (f == 0)
    {
      /* This is a completely new file.  */
      new->next = files[hashval];
      files[hashval] = new;
    }
  else
    {
      /* There is already a double-colon entry for this file.  */
      new->double_colon = f;
      while (f->prev != 0)
	f = f->prev;
      f->prev = new;
    }

  return new;
}

/* Rename FILE to NAME.  This is not as simple as resetting
   the `name' member, since it must be put in a new hash bucket,
   and possibly merged with an existing file called NAME.  */

void
rename_file (file, name)
     register struct file *file;
     char *name;
{
  char *oldname = file->name;
  register unsigned int oldhash;
  register char *n;

  while (file->renamed != 0)
    file = file->renamed;

  /* Find the hash values of the old and new names.  */

  oldhash = 0;
  for (n = oldname; *n != '\0'; ++n)
    HASH (oldhash, *n);

  file_hash_enter (file, name, oldhash, file->name);
}

void
file_hash_enter (file, name, oldhash, oldname)
     register struct file *file;
     char *name;
     unsigned int oldhash;
     char *oldname;
{
  unsigned int oldbucket = oldhash % FILE_BUCKETS;
  register unsigned int newhash, newbucket;
  struct file *oldfile;
  register char *n;
  register struct file *f;

  newhash = 0;
  for (n = name; *n != '\0'; ++n)
    HASH (newhash, *n);
  newbucket = newhash % FILE_BUCKETS;

  /* Look for an existing file under the new name.  */

  for (oldfile = files[newbucket]; oldfile != 0; oldfile = oldfile->next)
    if (streq (oldfile->name, name))
      break;

  if (oldhash != 0 && (newbucket != oldbucket || oldfile != 0))
    {
      /* Remove FILE from its hash bucket.  */

      struct file *lastf = 0;

      for (f = files[oldbucket]; f != file; f = f->next)
	lastf = f;

      if (lastf == 0)
	files[oldbucket] = f->next;
      else
	lastf->next = f->next;
    }

  /* Give FILE its new name.  */

  file->name = name;
  for (f = file->double_colon; f != 0; f = f->prev)
    f->name = name;

  if (oldfile == 0)
    {
      /* There is no existing file with the new name.  */

      if (newbucket != oldbucket)
	{
	  /* Put FILE in its new hash bucket.  */
	  file->next = files[newbucket];
	  files[newbucket] = file;
	}
    }
  else
    {
      /* There is an existing file with the new name.
	 We must merge FILE into the existing file.  */

      register struct dep *d;

      if (file->cmds != 0)
	{
	  if (oldfile->cmds == 0)
	    oldfile->cmds = file->cmds;
	  else if (file->cmds != oldfile->cmds)
	    {
	      /* We have two sets of commands.  We will go with the
		 one given in the rule explicitly mentioning this name,
		 but give a message to let the user know what's going on.  */
	      if (oldfile->cmds->filename != 0)
		makefile_error (file->cmds->filename, file->cmds->lineno,
				"Commands were specified for \
file `%s' at %s:%u,",
				oldname, oldfile->cmds->filename,
				oldfile->cmds->lineno);
	      else
		makefile_error (file->cmds->filename, file->cmds->lineno,
				"Commands for file `%s' were found by \
implicit rule search,",
				oldname);
	      makefile_error (file->cmds->filename, file->cmds->lineno,
			      "but `%s' is now considered the same file \
as `%s'.",
			      oldname, name);
	      makefile_error (file->cmds->filename, file->cmds->lineno,
			      "Commands for `%s' will be ignored \
in favor of those for `%s'.",
			      name, oldname);
	    }
	}

      /* Merge the dependencies of the two files.  */

      d = oldfile->deps;
      if (d == 0)
	oldfile->deps = file->deps;
      else
	{
	  while (d->next != 0)
	    d = d->next;
	  d->next = file->deps;
	}

      merge_variable_set_lists (&oldfile->variables, file->variables);

      if (oldfile->double_colon && !file->double_colon)
	fatal ("can't rename single-colon `%s' to double-colon `%s'",
	       oldname, name);
      if (!oldfile->double_colon && file->double_colon)
	fatal ("can't rename double-colon `%s' to single-colon `%s'",
	       oldname, name);

      if (file->last_mtime > oldfile->last_mtime)
	/* %%% Kludge so -W wins on a file that gets vpathized.  */
	oldfile->last_mtime = file->last_mtime;

#define MERGE(field) oldfile->field |= file->field
      MERGE (precious);
      MERGE (tried_implicit);
      MERGE (updating);
      MERGE (updated);
      MERGE (is_target);
      MERGE (cmd_target);
      MERGE (phony);
#undef MERGE

      file->renamed = oldfile;
    }
}

/* Remove all nonprecious intermediate files.
   If SIG is nonzero, this was caused by a fatal signal,
   meaning that a different message will be printed, and
   the message will go to stderr rather than stdout.  */

void
remove_intermediates (sig)
     int sig;
{
  register int i;
  register struct file *f;
  char doneany;
  
  if (question_flag || touch_flag)
    return;
  if (sig && just_print_flag)
    return;

  doneany = 0;
  for (i = 0; i < FILE_BUCKETS; ++i)
    for (f = files[i]; f != 0; f = f->next)
      if (f->intermediate && (f->dontcare || !f->precious))
	{
	  int status;
	  if (f->update_status == -1)
	    /* If nothing would have created this file yet,
	       don't print an "rm" command for it.  */
	    continue;
	  else if (just_print_flag)
	    status = 0;
	  else
	    {
	      status = unlink (f->name);
	      if (status < 0 && errno == ENOENT)
		continue;
	    }
	  if (!f->dontcare)
	    {
	      if (sig)
		error ("*** Deleting intermediate file `%s'", f->name);
	      else if (!silent_flag)
		{
		  if (! doneany)
		    {
		      fputs ("rm ", stdout);
		      doneany = 1;
		    }
		  else
		    putchar (' ');
		  fputs (f->name, stdout);
		  fflush (stdout);
		}
	      if (status < 0)
		perror_with_name ("unlink: ", f->name);
	    }
	}

  if (doneany && !sig)
    {
      putchar ('\n');
      fflush (stdout);
    }
}

/* For each dependency of each file, make the `struct dep' point
   at the appropriate `struct file' (which may have to be created).

   Also mark the files depended on by .PRECIOUS and .PHONY.  */

void
snap_deps ()
{
  register struct file *f, *f2;
  register struct dep *d;
  register int i;

  /* Enter each dependency name as a file.  */
  for (i = 0; i < FILE_BUCKETS; ++i)
    for (f = files[i]; f != 0; f = f->next)
      for (f2 = f; f2 != 0; f2 = f2->prev)
	for (d = f2->deps; d != 0; d = d->next)
	  if (d->name != 0)
	    {
	      d->file = lookup_file (d->name);
	      if (d->file == 0)
		d->file = enter_file (d->name);
	      else
		free (d->name);
	      d->name = 0;
	    }
  
  for (f = lookup_file (".PRECIOUS"); f != 0; f = f->prev)
    for (d = f->deps; d != 0; d = d->next)
      for (f2 = d->file; f2 != 0; f2 = f2->prev)
	f2->precious = 1;

  for (f = lookup_file (".PHONY"); f != 0; f = f->prev)
    for (d = f->deps; d != 0; d = d->next)
      for (f2 = d->file; f2 != 0; f2 = f2->prev)
	{
	  /* Mark this file as phony and nonexistent.  */
	  f2->phony = 1;
	  f2->last_mtime = (time_t) -1;
	}

  f = lookup_file (".EXPORT_ALL_VARIABLES");
  if (f != 0 && f->is_target)
    export_all_variables = 1;

  f = lookup_file (".IGNORE");
  if (f != 0 && f->is_target)
    {
      if (f->deps == 0)
	ignore_errors_flag = 1;
      else
	for (d = f->deps; d != 0; d = d->next)
	  for (f2 = d->file; f2 != 0; f2 = f2->prev)
	    f2->command_flags |= COMMANDS_NOERROR;
    }

  f = lookup_file (".SILENT");
  if (f != 0 && f->is_target)
    {
      if (f->deps == 0)
	silent_flag = 1;
      else
	for (d = f->deps; d != 0; d = d->next)
	  for (f2 = d->file; f2 != 0; f2 = f2->prev)
	    f2->command_flags |= COMMANDS_SILENT;
    }

  f = lookup_file (".POSIX");
  if (f != 0 && f->is_target)
    posix_pedantic = 1;
}

/* Set the `command_state' member of FILE and all its `also_make's.  */

void
set_command_state (file, state)
     struct file *file;
     int state;
{
  struct dep *d;

  file->command_state = state;

  for (d = file->also_make; d != 0; d = d->next)
    d->file->command_state = state;
}

/* Print the data base of files.  */

static void
print_file (f)
     struct file *f;
{
  register struct dep *d;

  putchar ('\n');
  if (!f->is_target)
    puts ("# Not a target:");
  printf ("%s:%s", f->name, f->double_colon ? ":" : "");
	      
  for (d = f->deps; d != 0; d = d->next)
    printf (" %s", dep_name (d));
  putchar ('\n');
	      
  if (f->precious)
    puts ("#  Precious file (dependency of .PRECIOUS).");
  if (f->phony)
    puts ("#  Phony target (dependency of .PHONY).");
  if (f->cmd_target)
    puts ("#  Command-line target.");
  if (f->dontcare)
    puts ("#  A default or MAKEFILES makefile.");
  printf ("#  Implicit rule search has%s been done.\n",
	  f->tried_implicit ? "" : " not");
  if (f->stem != 0)
    printf ("#  Implicit/static pattern stem: `%s'\n", f->stem);
  if (f->intermediate)
    puts ("#  File is an intermediate dependency.");
  if (f->also_make != 0)
    {
      fputs ("#  Also makes:", stdout);
      for (d = f->also_make; d != 0; d = d->next)
	printf (" %s", dep_name (d));
      putchar ('\n');
    }
  if (f->last_mtime == (time_t) 0)
    puts ("#  Modification time never checked.");
  else if (f->last_mtime == (time_t) -1)
    puts ("#  File does not exist.");
  else
    printf ("#  Last modified %.24s (%ld)\n",
	    ctime (&f->last_mtime), (long int) f->last_mtime);
  printf ("#  File has%s been updated.\n",
	  f->updated ? "" : " not");
  switch (f->command_state)
    {
    case cs_running:
      puts ("#  Commands currently running (THIS IS A BUG).");
      break;
    case cs_deps_running:
      puts ("#  Dependencies commands running (THIS IS A BUG).");
      break;
    case cs_not_started:
    case cs_finished:
      switch (f->update_status)
	{
	case -1:
	  break;
	case 0:
	  puts ("#  Successfully updated.");
	  break;
	case 1:
	  assert (question_flag);
	  puts ("#  Needs to be updated (-q is set).");
	  break;
	case 2:
	  puts ("#  Failed to be updated.");
	  break;
	default:
	  puts ("#  Invalid value in `update_status' member!");
	  fflush (stdout);
	  fflush (stderr);
	  abort ();
	}
      break;
    default:
      puts ("#  Invalid value in `command_state' member!");
      fflush (stdout);
      fflush (stderr);
      abort ();
    }

  if (f->variables != 0)
    print_file_variables (f);

  if (f->cmds != 0)
    print_commands (f->cmds);
}

void
print_file_data_base ()
{
  register unsigned int i, nfiles, per_bucket;
  register struct file *file;

  puts ("\n# Files");

  per_bucket = nfiles = 0;
  for (i = 0; i < FILE_BUCKETS; ++i)
    {
      register unsigned int this_bucket = 0;

      for (file = files[i]; file != 0; file = file->next)
	{
	  register struct file *f;

	  ++this_bucket;

	  for (f = file; f != 0; f = f->prev)
	    print_file (f);
	}

      nfiles += this_bucket;
      if (this_bucket > per_bucket)
	per_bucket = this_bucket;
    }

  if (nfiles == 0)
    puts ("\n# No files.");
  else
    {
      printf ("\n# %u files in %u hash buckets.\n", nfiles, FILE_BUCKETS);
#ifndef	NO_FLOAT
      printf ("# average %.1f files per bucket, max %u files in one bucket.\n",
	      ((double) nfiles) / ((double) FILE_BUCKETS) * 100.0, per_bucket);
#endif
    }
}