-
Notifications
You must be signed in to change notification settings - Fork 4
/
Copy pathimplicit.c
1017 lines (857 loc) · 34.6 KB
/
implicit.c
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
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* Implicit rule searching for GNU Make.
Copyright (C) 1988-2020 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 3 of the License, 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
this program. If not, see <http://www.gnu.org/licenses/>. */
#include "makeint.h"
#include "filedef.h"
#include "rule.h"
#include "dep.h"
#include "debug.h"
#include "variable.h"
#include "job.h" /* struct child, used inside commands.h */
#include "commands.h" /* set_file_variables */
static int pattern_search (struct file *file, int archive,
unsigned int depth, unsigned int recursions);
/* For a FILE which has no commands specified, try to figure out some
from the implicit pattern rules.
Returns 1 if a suitable implicit rule was found,
after modifying FILE to contain the appropriate commands and deps,
or returns 0 if no implicit rule was found. */
int
try_implicit_rule (struct file *file, unsigned int depth)
{
DBF (DB_IMPLICIT, _("Looking for an implicit rule for '%s'.\n"));
/* The order of these searches was previously reversed. My logic now is
that since the non-archive search uses more information in the target
(the archive search omits the archive name), it is more specific and
should come first. */
if (pattern_search (file, 0, depth, 0))
return 1;
#ifndef NO_ARCHIVES
/* If this is an archive member reference, use just the
archive member name to search for implicit rules. */
if (ar_name (file->name))
{
DBF (DB_IMPLICIT,
_("Looking for archive-member implicit rule for '%s'.\n"));
if (pattern_search (file, 1, depth, 0))
return 1;
}
#endif
return 0;
}
/* Scans the BUFFER for the next word with whitespace as a separator.
Returns the pointer to the beginning of the word. LENGTH hold the
length of the word. */
static const char *
get_next_word (const char *buffer, size_t *length)
{
const char *p = buffer, *beg;
char c;
/* Skip any leading whitespace. */
NEXT_TOKEN (p);
beg = p;
c = *(p++);
if (c == '\0')
return 0;
/* We already found the first value of "c", above. */
while (1)
{
char closeparen;
int count;
switch (c)
{
case '\0':
case ' ':
case '\t':
goto done_word;
case '$':
c = *(p++);
if (c == '$')
break;
/* This is a variable reference, so read it to the matching
close paren. */
if (c == '(')
closeparen = ')';
else if (c == '{')
closeparen = '}';
else
/* This is a single-letter variable reference. */
break;
for (count = 0; *p != '\0'; ++p)
{
if (*p == c)
++count;
else if (*p == closeparen && --count < 0)
{
++p;
break;
}
}
break;
case '|':
goto done;
default:
break;
}
c = *(p++);
}
done_word:
--p;
done:
if (length)
*length = p - beg;
return beg;
}
/* This structure stores information about the expanded prerequisites for a
pattern rule. NAME is always set to the strcache'd name of the prereq.
FILE and PATTERN will be set for intermediate files only. IGNORE_MTIME is
copied from the prerequisite we expanded.
*/
struct patdeps
{
const char *name;
const char *pattern;
struct file *file;
unsigned int ignore_mtime : 1;
unsigned int ignore_automatic_vars : 1;
};
/* This structure stores information about pattern rules that we need
to try.
*/
struct tryrule
{
struct rule *rule;
/* Stem length for this match. */
size_t stemlen;
/* Index of the target in this rule that matched the file. */
unsigned int matches;
/* Definition order of this rule. Used to implement stable sort.*/
unsigned int order;
/* Nonzero if the LASTSLASH logic was used in matching this rule. */
char checked_lastslash;
};
int
stemlen_compare (const void *v1, const void *v2)
{
const struct tryrule *r1 = v1;
const struct tryrule *r2 = v2;
int r = (int) (r1->stemlen - r2->stemlen);
return r != 0 ? r : (int) (r1->order - r2->order);
}
/* Search the pattern rules for a rule with an existing dependency to make
FILE. If a rule is found, the appropriate commands and deps are put in FILE
and 1 is returned. If not, 0 is returned.
If ARCHIVE is nonzero, FILE->name is of the form "LIB(MEMBER)". A rule for
"(MEMBER)" will be searched for, and "(MEMBER)" will not be chopped up into
directory and filename parts.
If an intermediate file is found by pattern search, the intermediate file
is set up as a target by the recursive call and is also made a dependency
of FILE.
DEPTH is used for debugging messages. */
static int
pattern_search (struct file *file, int archive,
unsigned int depth, unsigned int recursions)
{
/* Filename we are searching for a rule for. */
const char *filename = archive ? strchr (file->name, '(') : file->name;
/* Length of FILENAME. */
size_t namelen = strlen (filename);
/* The last slash in FILENAME (or nil if there is none). */
const char *lastslash;
/* This is a file-object used as an argument in
recursive calls. It never contains any data
except during a recursive call. */
struct file *int_file = 0;
/* List of dependencies found recursively. */
unsigned int max_deps = max_pattern_deps;
struct patdeps *deplist = xmalloc (max_deps * sizeof (struct patdeps));
struct patdeps *pat = deplist;
/* Names of possible dependencies are constructed in this buffer.
We may replace % by $(*F) for second expansion, increasing the length. */
char *depname = alloca (namelen + max_pattern_dep_length + 4);
/* The start and length of the stem of FILENAME for the current rule. */
const char *stem = 0;
size_t stemlen = 0;
size_t fullstemlen = 0;
/* Buffer in which we store all the rules that are possibly applicable. */
struct tryrule *tryrules = xmalloc (num_pattern_rules * max_pattern_targets
* sizeof (struct tryrule));
/* Number of valid elements in TRYRULES. */
unsigned int nrules;
/* The index in TRYRULES of the rule we found. */
unsigned int foundrule;
/* Nonzero if should consider intermediate files as dependencies. */
int intermed_ok;
/* Nonzero if we have initialized file variables for this target. */
int file_vars_initialized = 0;
/* Nonzero if we have matched a pattern-rule target
that is not just '%'. */
int specific_rule_matched = 0;
unsigned int ri; /* uninit checks OK */
struct rule *rule;
char *pathdir = NULL;
size_t pathlen;
PATH_VAR (stem_str); /* @@ Need to get rid of stem, stemlen, etc. */
#ifndef NO_ARCHIVES
if (archive || ar_name (filename))
lastslash = 0;
else
#endif
{
/* Set LASTSLASH to point at the last slash in FILENAME
but not counting any slash at the end. (foo/bar/ counts as
bar/ in directory foo/, not empty in directory foo/bar/.) */
lastslash = memrchr (filename, '/', namelen - 1);
#ifdef VMS
if (lastslash == NULL)
lastslash = strrchr (filename, ']');
if (lastslash == NULL)
lastslash = strrchr (filename, '>');
if (lastslash == NULL)
lastslash = strrchr (filename, ':');
#endif
#ifdef HAVE_DOS_PATHS
/* Handle backslashes (possibly mixed with forward slashes)
and the case of "d:file". */
{
char *bslash = memrchr (filename, '\\', namelen - 1);
if (lastslash == 0 || bslash > lastslash)
lastslash = bslash;
if (lastslash == 0 && filename[0] && filename[1] == ':')
lastslash = filename + 1;
}
#endif
}
pathlen = lastslash ? lastslash - filename + 1 : 0;
/* First see which pattern rules match this target and may be considered.
Put them in TRYRULES. */
nrules = 0;
for (rule = pattern_rules; rule != 0; rule = rule->next)
{
unsigned int ti;
/* If the pattern rule has deps but no commands, ignore it.
Users cancel built-in rules by redefining them without commands. */
if (rule->deps != 0 && rule->cmds == 0)
continue;
/* If this rule is in use by a parent pattern_search,
don't use it here. */
if (rule->in_use)
{
DBS (DB_IMPLICIT, (_("Avoiding implicit rule recursion.\n")));
continue;
}
for (ti = 0; ti < rule->num; ++ti)
{
const char *target = rule->targets[ti];
const char *suffix = rule->suffixes[ti];
char check_lastslash;
/* Rules that can match any filename and are not terminal
are ignored if we're recursing, so that they cannot be
intermediate files. */
if (recursions > 0 && target[1] == '\0' && !rule->terminal)
continue;
if (rule->lens[ti] > namelen)
/* It can't possibly match. */
continue;
/* From the lengths of the filename and the pattern parts,
find the stem: the part of the filename that matches the %. */
stem = filename + (suffix - target - 1);
stemlen = namelen - rule->lens[ti] + 1;
/* Set CHECK_LASTSLASH if FILENAME contains a directory
prefix and the target pattern does not contain a slash. */
check_lastslash = 0;
if (lastslash)
{
#ifdef VMS
check_lastslash = strpbrk (target, "/]>:") == NULL;
#else
check_lastslash = strchr (target, '/') == 0;
#endif
#ifdef HAVE_DOS_PATHS
/* Didn't find it yet: check for DOS-type directories. */
if (check_lastslash)
{
char *b = strchr (target, '\\');
check_lastslash = !(b || (target[0] && target[1] == ':'));
}
#endif
}
if (check_lastslash)
{
/* If so, don't include the directory prefix in STEM here. */
if (pathlen > stemlen)
continue;
stemlen -= pathlen;
stem += pathlen;
}
/* Check that the rule pattern matches the text before the stem. */
if (check_lastslash)
{
if (stem > (lastslash + 1)
&& !strneq (target, lastslash + 1, stem - lastslash - 1))
continue;
}
else if (stem > filename
&& !strneq (target, filename, stem - filename))
continue;
/* Check that the rule pattern matches the text after the stem.
We could test simply use streq, but this way we compare the
first two characters immediately. This saves time in the very
common case where the first character matches because it is a
period. */
if (*suffix != stem[stemlen]
|| (*suffix != '\0' && !streq (&suffix[1], &stem[stemlen + 1])))
continue;
/* Record if we match a rule that not all filenames will match. */
if (target[1] != '\0')
specific_rule_matched = 1;
/* A rule with no dependencies and no commands exists solely to set
specific_rule_matched when it matches. Don't try to use it. */
if (rule->deps == 0 && rule->cmds == 0)
continue;
/* Record this rule in TRYRULES and the index of the matching
target in MATCHES. If several targets of the same rule match,
that rule will be in TRYRULES more than once. */
tryrules[nrules].rule = rule;
tryrules[nrules].matches = ti;
tryrules[nrules].stemlen = stemlen + (check_lastslash ? pathlen : 0);
tryrules[nrules].order = nrules;
tryrules[nrules].checked_lastslash = check_lastslash;
++nrules;
}
}
/* Bail out early if we haven't found any rules. */
if (nrules == 0)
goto done;
/* Sort the rules to place matches with the shortest stem first. This
way the most specific rules will be tried first. */
if (nrules > 1)
qsort (tryrules, nrules, sizeof (struct tryrule), stemlen_compare);
/* If we have found a matching rule that won't match all filenames,
retroactively reject any non-"terminal" rules that do always match. */
if (specific_rule_matched)
for (ri = 0; ri < nrules; ++ri)
if (!tryrules[ri].rule->terminal)
{
unsigned int j;
for (j = 0; j < tryrules[ri].rule->num; ++j)
if (tryrules[ri].rule->targets[j][1] == '\0')
{
tryrules[ri].rule = 0;
break;
}
}
/* Try each rule once without intermediate files, then once with them. */
for (intermed_ok = 0; intermed_ok < 2; ++intermed_ok)
{
pat = deplist;
/* Try each pattern rule till we find one that applies. If it does,
expand its dependencies (as substituted) and chain them in DEPS. */
for (ri = 0; ri < nrules; ri++)
{
struct dep *dep;
char check_lastslash;
unsigned int failed = 0;
int file_variables_set = 0;
unsigned int deps_found = 0;
/* NPTR points to the part of the prereq we haven't processed. */
const char *nptr = 0;
int order_only = 0;
unsigned int matches;
rule = tryrules[ri].rule;
/* RULE is nil when we discover that a rule, already placed in
TRYRULES, should not be applied. */
if (rule == 0)
continue;
/* Reject any terminal rules if we're looking to make intermediate
files. */
if (intermed_ok && rule->terminal)
continue;
/* From the lengths of the filename and the matching pattern parts,
find the stem: the part of the filename that matches the %. */
matches = tryrules[ri].matches;
stem = filename + (rule->suffixes[matches]
- rule->targets[matches]) - 1;
stemlen = (namelen - rule->lens[matches]) + 1;
check_lastslash = tryrules[ri].checked_lastslash;
if (check_lastslash)
{
stem += pathlen;
stemlen -= pathlen;
/* We need to add the directory prefix, so set it up. */
if (! pathdir)
{
pathdir = alloca (pathlen + 1);
memcpy (pathdir, filename, pathlen);
pathdir[pathlen] = '\0';
}
}
if (stemlen + (check_lastslash ? pathlen : 0) > GET_PATH_MAX)
{
DBS (DB_IMPLICIT, (_("Stem too long: '%s%.*s'.\n"),
check_lastslash ? pathdir : "",
(int) stemlen, stem));
continue;
}
DBS (DB_IMPLICIT, (_("Trying pattern rule with stem '%.*s'.\n"),
(int) stemlen, stem));
if (!check_lastslash)
{
memcpy (stem_str, stem, stemlen);
stem_str[stemlen] = '\0';
}
else
{
/* We want to prepend the directory from
the original FILENAME onto the stem. */
memcpy (stem_str, filename, pathlen);
memcpy (stem_str + pathlen, stem, stemlen);
stem_str[pathlen + stemlen] = '\0';
}
/* If there are no prerequisites, then this rule matches. */
if (rule->deps == 0)
break;
/* Temporary assign STEM to file->stem (needed to set file
variables below). */
file->stem = stem_str;
/* Mark this rule as in use so a recursive pattern_search won't try
to use it. */
rule->in_use = 1;
/* Try each prerequisite; see if it exists or can be created. We'll
build a list of prereq info in DEPLIST. Due to 2nd expansion we
may have to process multiple prereqs for a single dep entry. */
pat = deplist;
dep = rule->deps;
nptr = dep_name (dep);
while (1)
{
struct dep *dl, *d;
char *p;
/* If we're out of name to parse, start the next prereq. */
if (! nptr)
{
dep = dep->next;
if (dep == 0)
break;
nptr = dep_name (dep);
}
/* If we don't need a second expansion, just replace the %. */
if (! dep->need_2nd_expansion)
{
p = strchr (nptr, '%');
if (p == 0)
strcpy (depname, nptr);
else
{
char *o = depname;
if (check_lastslash)
{
memcpy (o, filename, pathlen);
o += pathlen;
}
memcpy (o, nptr, p - nptr);
o += p - nptr;
memcpy (o, stem, stemlen);
o += stemlen;
strcpy (o, p + 1);
}
/* Parse the expanded string. It might have wildcards. */
p = depname;
dl = PARSE_FILE_SEQ (&p, struct dep, MAP_NUL, NULL, PARSEFS_ONEWORD);
for (d = dl; d != NULL; d = d->next)
{
++deps_found;
d->ignore_mtime = dep->ignore_mtime;
d->ignore_automatic_vars = dep->ignore_automatic_vars;
}
/* We've used up this dep, so next time get a new one. */
nptr = 0;
}
/* We have to perform second expansion on this prereq. In an
ideal world we would take the dependency line, substitute the
stem, re-expand the whole line and chop it into individual
prerequisites. Unfortunately this won't work because of the
"check_lastslash" twist. Instead, we will have to go word by
word, taking $()'s into account. For each word we will
substitute the stem, re-expand, chop it up, and, if
check_lastslash != 0, add the directory part to each
resulting prerequisite. */
else
{
int add_dir = 0;
size_t len;
struct dep **dptr;
nptr = get_next_word (nptr, &len);
if (nptr == 0)
continue;
/* See this is a transition to order-only prereqs. */
if (! order_only && len == 1 && nptr[0] == '|')
{
order_only = 1;
nptr += len;
continue;
}
/* If the dependency name has %, substitute the stem. If we
just replace % with the stem value then later, when we do
the 2nd expansion, we will re-expand this stem value
again. This is not good if you have certain characters
in your stem (like $).
Instead, we will replace % with $* or $(*F) and allow the
second expansion to take care of it for us. This way
(since $* and $(*F) are simple variables) there won't be
additional re-expansion of the stem. */
p = lindex (nptr, nptr + len, '%');
if (p == 0)
{
memcpy (depname, nptr, len);
depname[len] = '\0';
}
else
{
size_t i = p - nptr;
char *o = depname;
memcpy (o, nptr, i);
o += i;
if (check_lastslash)
{
add_dir = 1;
memcpy (o, "$(*F)", 5);
o += 5;
}
else
{
memcpy (o, "$*", 2);
o += 2;
}
memcpy (o, p + 1, len - i - 1);
o[len - i - 1] = '\0';
}
/* Set up for the next word. */
nptr += len;
/* Initialize and set file variables if we haven't already
done so. */
if (!file_vars_initialized)
{
initialize_file_variables (file, 0);
set_file_variables (file);
file_vars_initialized = 1;
}
/* Update the stem value in $* for this rule. */
else if (!file_variables_set)
{
define_variable_for_file (
"*", 1, file->stem, o_automatic, 0, file);
file_variables_set = 1;
}
/* Perform the 2nd expansion. */
p = variable_expand_for_file (depname, file);
dptr = &dl;
/* Parse the results into a deps list. */
do
{
/* Parse the expanded string. */
struct dep *dp = PARSE_FILE_SEQ (&p, struct dep,
order_only ? MAP_NUL : MAP_PIPE,
add_dir ? pathdir : NULL, PARSEFS_NONE);
*dptr = dp;
for (d = dp; d != NULL; d = d->next)
{
++deps_found;
if (order_only)
d->ignore_mtime = 1;
dptr = &d->next;
}
/* If we stopped due to an order-only token, note it. */
if (*p == '|')
{
order_only = 1;
++p;
}
}
while (*p != '\0');
}
/* If there are more than max_pattern_deps prerequisites (due to
2nd expansion), reset it and realloc the arrays. */
if (deps_found > max_deps)
{
size_t l = pat - deplist;
/* This might have changed due to recursion. */
max_pattern_deps = MAX(max_pattern_deps, deps_found);
max_deps = max_pattern_deps;
deplist = xrealloc (deplist,
max_deps * sizeof (struct patdeps));
pat = deplist + l;
}
/* Go through the nameseq and handle each as a prereq name. */
for (d = dl; d != 0; d = d->next)
{
struct dep *expl_d;
int is_rule = d->name == dep_name (dep);
if (file_impossible_p (d->name))
{
/* If this prereq has already been ruled "impossible",
then the rule fails. Don't bother trying it on the
second pass either since we know that will fail. */
DBS (DB_IMPLICIT,
(is_rule
? _("Rejecting impossible rule prerequisite '%s'.\n")
: _("Rejecting impossible implicit prerequisite '%s'.\n"),
d->name));
tryrules[ri].rule = 0;
failed = 1;
break;
}
memset (pat, '\0', sizeof (struct patdeps));
pat->ignore_mtime = d->ignore_mtime;
pat->ignore_automatic_vars = d->ignore_automatic_vars;
DBS (DB_IMPLICIT,
(is_rule
? _("Trying rule prerequisite '%s'.\n")
: _("Trying implicit prerequisite '%s'.\n"), d->name));
/* If this prereq is also explicitly mentioned for FILE,
skip all tests below since it must be built no matter
which implicit rule we choose. */
for (expl_d = file->deps; expl_d != 0; expl_d = expl_d->next)
if (streq (dep_name (expl_d), d->name))
break;
if (expl_d != 0)
{
(pat++)->name = d->name;
continue;
}
/* The DEP->changed flag says that this dependency resides
in a nonexistent directory. So we normally can skip
looking for the file. However, if CHECK_LASTSLASH is
set, then the dependency file we are actually looking for
is in a different directory (the one gotten by prepending
FILENAME's directory), so it might actually exist. */
/* @@ dep->changed check is disabled. */
if (lookup_file (d->name) != 0
/*|| ((!dep->changed || check_lastslash) && */
|| file_exists_p (d->name))
{
(pat++)->name = d->name;
continue;
}
/* This code, given FILENAME = "lib/foo.o", dependency name
"lib/foo.c", and VPATH=src, searches for
"src/lib/foo.c". */
{
const char *vname = vpath_search (d->name, 0, NULL, NULL);
if (vname)
{
DBS (DB_IMPLICIT,
(_("Found prerequisite '%s' as VPATH '%s'\n"),
d->name, vname));
(pat++)->name = d->name;
continue;
}
}
/* We could not find the file in any place we should look.
Try to make this dependency as an intermediate file, but
only on the second pass. */
if (intermed_ok)
{
DBS (DB_IMPLICIT,
(_("Looking for a rule with intermediate file '%s'.\n"),
d->name));
if (int_file == 0)
int_file = (struct file *) alloca (sizeof (struct file));
memset (int_file, '\0', sizeof (struct file));
int_file->name = d->name;
if (pattern_search (int_file,
0,
depth + 1,
recursions + 1))
{
pat->pattern = int_file->name;
int_file->name = d->name;
pat->file = int_file;
int_file = 0;
(pat++)->name = d->name;
continue;
}
/* If we have tried to find P as an intermediate file
and failed, mark that name as impossible so we won't
go through the search again later. */
if (int_file->variables)
free_variable_set (int_file->variables);
if (int_file->pat_variables)
free_variable_set (int_file->pat_variables);
file_impossible (d->name);
}
/* A dependency of this rule does not exist. Therefore, this
rule fails. */
failed = 1;
break;
}
/* Free the ns chain. */
free_dep_chain (dl);
if (failed)
break;
}
/* Reset the stem in FILE. */
file->stem = 0;
/* This rule is no longer 'in use' for recursive searches. */
rule->in_use = 0;
if (! failed)
/* This pattern rule does apply. Stop looking for one. */
break;
/* This pattern rule does not apply. Keep looking. */
}
/* If we found an applicable rule without intermediate files, don't try
with them. */
if (ri < nrules)
break;
rule = 0;
}
/* RULE is nil if the loop went through the list but everything failed. */
if (rule == 0)
goto done;
foundrule = ri;
/* If we are recursing, store the pattern that matched FILENAME in
FILE->name for use in upper levels. */
if (recursions > 0)
/* Kludge-o-matic */
file->name = rule->targets[tryrules[foundrule].matches];
/* DEPLIST lists the prerequisites for the rule we found. This includes the
intermediate files, if any. Convert them into entries on the deps-chain
of FILE. */
while (pat-- > deplist)
{
struct dep *dep;
const char *s;
if (pat->file != 0)
{
/* If we need to use an intermediate file, make sure it is entered
as a target, with the info that was found for it in the recursive
pattern_search call. We know that the intermediate file did not
already exist as a target; therefore we can assume that the deps
and cmds of F below are null before we change them. */
struct file *imf = pat->file;
struct file *f = lookup_file (imf->name);
/* We don't want to delete an intermediate file that happened
to be a prerequisite of some (other) target. Mark it as
secondary. We don't want it to be precious as that disables
DELETE_ON_ERROR etc. */
if (f != 0)
f->secondary = 1;
else
f = enter_file (imf->name);
f->deps = imf->deps;
f->cmds = imf->cmds;
f->stem = imf->stem;
f->variables = imf->variables;
f->pat_variables = imf->pat_variables;
f->pat_searched = imf->pat_searched;
f->also_make = imf->also_make;
f->is_target = 1;
f->intermediate = 1;
f->tried_implicit = 1;
imf = lookup_file (pat->pattern);
if (imf != 0 && imf->precious)
f->precious = 1;
for (dep = f->deps; dep != 0; dep = dep->next)
{
dep->file = enter_file (dep->name);
dep->name = 0;
dep->file->tried_implicit |= dep->changed;
}
}
dep = alloc_dep ();
dep->ignore_mtime = pat->ignore_mtime;
dep->ignore_automatic_vars = pat->ignore_automatic_vars;
s = strcache_add (pat->name);
if (recursions)
dep->name = s;
else
{
dep->file = lookup_file (s);
if (dep->file == 0)
dep->file = enter_file (s);
}
if (pat->file == 0 && tryrules[foundrule].rule->terminal)
{
/* If the file actually existed (was not an intermediate file), and
the rule that found it was a terminal one, then we want to mark
the found file so that it will not have implicit rule search done
for it. If we are not entering a 'struct file' for it now, we
indicate this with the 'changed' flag. */
if (dep->file == 0)
dep->changed = 1;
else
dep->file->tried_implicit = 1;
}
dep->next = file->deps;
file->deps = dep;
}
if (!tryrules[foundrule].checked_lastslash)
{
/* Always allocate new storage, since STEM might be on the stack for an
intermediate file. */
file->stem = strcache_add_len (stem, stemlen);
fullstemlen = stemlen;
}
else
{
/* We want to prepend the directory from
the original FILENAME onto the stem. */
fullstemlen = pathlen + stemlen;
memcpy (stem_str, filename, pathlen);
memcpy (stem_str + pathlen, stem, stemlen);
stem_str[fullstemlen] = '\0';
file->stem = strcache_add (stem_str);
}
file->cmds = rule->cmds;
file->is_target = 1;
/* Set precious flag. */
{
struct file *f = lookup_file (rule->targets[tryrules[foundrule].matches]);
if (f && f->precious)
file->precious = 1;
}
/* If this rule builds other targets, too, put the others into FILE's
'also_make' member. */
if (rule->num > 1)
for (ri = 0; ri < rule->num; ++ri)
if (ri != tryrules[foundrule].matches)
{
char *nm = alloca (rule->lens[ri] + fullstemlen + 1);
char *p = nm;
struct file *f;
struct dep *new = alloc_dep ();
/* GKM FIMXE: handle '|' here too */
memcpy (p, rule->targets[ri],
rule->suffixes[ri] - rule->targets[ri] - 1);
p += rule->suffixes[ri] - rule->targets[ri] - 1;
memcpy (p, file->stem, fullstemlen);
p += fullstemlen;
memcpy (p, rule->suffixes[ri],
rule->lens[ri] - (rule->suffixes[ri] - rule->targets[ri])+1);
new->name = strcache_add (nm);
new->file = enter_file (new->name);
new->next = file->also_make;
/* Set precious flag. */
f = lookup_file (rule->targets[ri]);