source: trunk/src/gmake/variable.c@ 576

Last change on this file since 576 was 576, checked in by bird, 19 years ago

versioning. fixes #5
  • Property svn:eol-style set to native
File size: 57.6 KB
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1/* Internals of variables for GNU Make.
2Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
31998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
4Foundation, Inc.
5This file is part of GNU Make.
6
7GNU Make is free software; you can redistribute it and/or modify it under the
8terms of the GNU General Public License as published by the Free Software
9Foundation; either version 2, or (at your option) any later version.
10
11GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License along with
16GNU Make; see the file COPYING. If not, write to the Free Software
17Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
18
19#include "make.h"
20
21#include <assert.h>
22
23#include "dep.h"
24#include "filedef.h"
25#include "job.h"
26#include "commands.h"
27#include "variable.h"
28#include "rule.h"
29#ifdef WINDOWS32
30#include "pathstuff.h"
31#endif
32#include "hash.h"
33
34/* Chain of all pattern-specific variables. */
35
36static struct pattern_var *pattern_vars;
37
38/* Pointer to last struct in the chain, so we can add onto the end. */
39
40static struct pattern_var *last_pattern_var;
41
42/* Create a new pattern-specific variable struct. */
43
44struct pattern_var *
45create_pattern_var (char *target, char *suffix)
46{
47 register struct pattern_var *p
48 = (struct pattern_var *) xmalloc (sizeof (struct pattern_var));
49
50 if (last_pattern_var != 0)
51 last_pattern_var->next = p;
52 else
53 pattern_vars = p;
54 last_pattern_var = p;
55 p->next = 0;
56
57 p->target = target;
58 p->len = strlen (target);
59 p->suffix = suffix + 1;
60
61 return p;
62}
63
64/* Look up a target in the pattern-specific variable list. */
65
66static struct pattern_var *
67lookup_pattern_var (struct pattern_var *start, char *target)
68{
69 struct pattern_var *p;
70 unsigned int targlen = strlen(target);
71
72 for (p = start ? start->next : pattern_vars; p != 0; p = p->next)
73 {
74 char *stem;
75 unsigned int stemlen;
76
77 if (p->len > targlen)
78 /* It can't possibly match. */
79 continue;
80
81 /* From the lengths of the filename and the pattern parts,
82 find the stem: the part of the filename that matches the %. */
83 stem = target + (p->suffix - p->target - 1);
84 stemlen = targlen - p->len + 1;
85
86 /* Compare the text in the pattern before the stem, if any. */
87 if (stem > target && !strneq (p->target, target, stem - target))
88 continue;
89
90 /* Compare the text in the pattern after the stem, if any.
91 We could test simply using streq, but this way we compare the
92 first two characters immediately. This saves time in the very
93 common case where the first character matches because it is a
94 period. */
95 if (*p->suffix == stem[stemlen]
96 && (*p->suffix == '\0' || streq (&p->suffix[1], &stem[stemlen+1])))
97 break;
98 }
99
100 return p;
101}
102
103
104/* Hash table of all global variable definitions. */
105
106#ifdef CONFIG_WITH_OPTIMIZATION_HACKS
107# ifdef _MSC_VER
108# define inline _inline
109typedef signed int int32_t;
110typedef signed short int int16_t;
111# endif
112static inline unsigned long variable_hash_2i(register const unsigned char *var, register int length)
113{
114 register unsigned int hash = 0;
115 var += length;
116 switch (length)
117 {
118 default:
119 case 16: hash = *--var + (hash << 6) + (hash << 16) - hash;
120 case 15: hash = *--var + (hash << 6) + (hash << 16) - hash;
121 case 14: hash = *--var + (hash << 6) + (hash << 16) - hash;
122 case 13: hash = *--var + (hash << 6) + (hash << 16) - hash;
123 case 12: hash = *--var + (hash << 6) + (hash << 16) - hash;
124 case 11: hash = *--var + (hash << 6) + (hash << 16) - hash;
125 case 10: hash = *--var + (hash << 6) + (hash << 16) - hash;
126 case 9: hash = *--var + (hash << 6) + (hash << 16) - hash;
127 case 8: hash = *--var + (hash << 6) + (hash << 16) - hash;
128 case 7: hash = *--var + (hash << 6) + (hash << 16) - hash;
129 case 6: hash = *--var + (hash << 6) + (hash << 16) - hash;
130 case 5: hash = *--var + (hash << 6) + (hash << 16) - hash;
131 case 4: hash = *--var + (hash << 6) + (hash << 16) - hash;
132 case 3: hash = *--var + (hash << 6) + (hash << 16) - hash;
133 case 2: hash = *--var + (hash << 6) + (hash << 16) - hash;
134 case 1: hash = *--var + (hash << 6) + (hash << 16) - hash;
135 case 0:
136 break;
137 }
138 return hash;
139}
140
141static inline unsigned long variable_hash_1i(register const unsigned char *var, register int length)
142{
143 register unsigned int hash = ((5381 << 5) + 5381) + *var;
144 switch (length)
145 {
146 default:
147 case 8: hash = ((hash << 5) + hash) + var[7];
148 case 7: hash = ((hash << 5) + hash) + var[6];
149 case 6: hash = ((hash << 5) + hash) + var[5];
150 case 5: hash = ((hash << 5) + hash) + var[4];
151 case 4: hash = ((hash << 5) + hash) + var[3];
152 case 3: hash = ((hash << 5) + hash) + var[2];
153 case 2: hash = ((hash << 5) + hash) + var[1];
154 case 1: return hash;
155 case 0: return 5381; /* shouldn't happen */
156 }
157}
158#endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
159
160static unsigned long
161variable_hash_1 (const void *keyv)
162{
163 struct variable const *key = (struct variable const *) keyv;
164#ifdef VARIABLE_HASH /* bird */
165# ifdef VARIABLE_HASH_STRICT
166 if (key->hash1 != variable_hash_1i (key->name, key->length))
167 __asm__("int3");
168 if (key->hash2 && key->hash2 != variable_hash_2i (key->name, key->length))
169 __asm__("int3");
170# endif
171 return key->hash1;
172#else
173# ifdef CONFIG_WITH_OPTIMIZATION_HACKS
174 return variable_hash_1i (key->name, key->length);
175# else
176 return_STRING_N_HASH_1 (key->name, key->length);
177# endif
178#endif
179}
180
181static unsigned long
182variable_hash_2 (const void *keyv)
183{
184#ifdef VARIABLE_HASH /* bird */
185 struct variable *key = (struct variable *) keyv;
186 if (!key->hash2)
187 key->hash2 = variable_hash_2i (key->name, key->length);
188 return key->hash2;
189#else
190 struct variable const *key = (struct variable const *) keyv;
191# ifdef CONFIG_WITH_OPTIMIZATION_HACKS
192 return variable_hash_2i (key->name, key->length);
193# else
194 return_STRING_N_HASH_2 (key->name, key->length);
195# endif
196#endif
197}
198
199static int
200variable_hash_cmp (const void *xv, const void *yv)
201{
202 struct variable const *x = (struct variable const *) xv;
203 struct variable const *y = (struct variable const *) yv;
204 int result = x->length - y->length;
205 if (result)
206 return result;
207#ifdef VARIABLE_HASH_STRICT /* bird */
208 if (x->hash1 != variable_hash_1i (x->name, x->length))
209 __asm__("int3");
210 if (x->hash2 && x->hash2 != variable_hash_2i (x->name, x->length))
211 __asm__("int3");
212 if (y->hash1 != variable_hash_1i (y->name, y->length))
213 __asm__("int3");
214 if (y->hash2 && y->hash2 != variable_hash_2i (y->name, y->length))
215 __asm__("int3");
216#endif
217#ifdef VARIABLE_HASH
218 /* hash 1 */
219 result = x->hash1 - y->hash1;
220 if (result)
221 return result;
222#endif
223#ifdef CONFIG_WITH_OPTIMIZATION_HACKS /* bird: speed */
224 {
225 const char *xs = x->name;
226 const char *ys = y->name;
227 switch (x->length)
228 {
229 case 8:
230 result = *(int32_t*)(xs + 4) - *(int32_t*)(ys + 4);
231 if (result)
232 return result;
233 return *(int32_t*)xs - *(int32_t*)ys;
234 case 7:
235 result = xs[6] - ys[6];
236 if (result)
237 return result;
238 case 6:
239 result = *(int32_t*)xs - *(int32_t*)ys;
240 if (result)
241 return result;
242 return *(int16_t*)(xs + 4) - *(int16_t*)(ys + 4);
243 case 5:
244 result = xs[4] - ys[4];
245 if (result)
246 return result;
247 case 4:
248 return *(int32_t*)xs - *(int32_t*)ys;
249 case 3:
250 result = xs[2] - ys[2];
251 if (result)
252 return result;
253 case 2:
254 return *(int16_t*)xs - *(int16_t*)ys;
255 case 1:
256 return *xs - *ys;
257 case 0:
258 return 0;
259 }
260 }
261#endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
262#ifdef VARIABLE_HASH
263 /* hash 2 */
264 if (!x->hash2)
265 ((struct variable *)x)->hash2 = variable_hash_2i (x->name, x->length);
266 if (!y->hash2)
267 ((struct variable *)y)->hash2 = variable_hash_2i (y->name, y->length);
268 result = x->hash2 - y->hash2;
269 if (result)
270 return result;
271#endif
272#ifdef CONFIG_WITH_OPTIMIZATION_HACKS
273 return memcmp (x->name, y->name, x->length);
274#else
275 return_STRING_N_COMPARE (x->name, y->name, x->length);
276#endif
277}
278
279#ifndef VARIABLE_BUCKETS
280#define VARIABLE_BUCKETS 523
281#endif
282#ifndef PERFILE_VARIABLE_BUCKETS
283#define PERFILE_VARIABLE_BUCKETS 23
284#endif
285#ifndef SMALL_SCOPE_VARIABLE_BUCKETS
286#define SMALL_SCOPE_VARIABLE_BUCKETS 13
287#endif
288
289static struct variable_set global_variable_set;
290static struct variable_set_list global_setlist
291 = { 0, &global_variable_set };
292struct variable_set_list *current_variable_set_list = &global_setlist;
293
294
295/* Implement variables. */
296
297void
298init_hash_global_variable_set (void)
299{
300 hash_init (&global_variable_set.table,
301#ifdef KMK /* FIMXE: just redefine the bucket size! */
302 16384,
303#else
304 VARIABLE_BUCKETS,
305#endif
306 variable_hash_1, variable_hash_2, variable_hash_cmp);
307}
308
309/* Define variable named NAME with value VALUE in SET. VALUE is copied.
310 LENGTH is the length of NAME, which does not need to be null-terminated.
311 ORIGIN specifies the origin of the variable (makefile, command line
312 or environment).
313 If RECURSIVE is nonzero a flag is set in the variable saying
314 that it should be recursively re-expanded. */
315
316#ifdef CONFIG_WITH_VALUE_LENGTH
317struct variable *
318define_variable_in_set (const char *name, unsigned int length,
319 char *value, unsigned int value_length, int duplicate_value,
320 enum variable_origin origin, int recursive,
321 struct variable_set *set, const struct floc *flocp)
322#else
323struct variable *
324define_variable_in_set (const char *name, unsigned int length,
325 char *value, enum variable_origin origin,
326 int recursive, struct variable_set *set,
327 const struct floc *flocp)
328#endif
329{
330 struct variable *v;
331 struct variable **var_slot;
332 struct variable var_key;
333
334 if (set == NULL)
335 set = &global_variable_set;
336
337 var_key.name = (char *) name;
338 var_key.length = length;
339#ifdef VARIABLE_HASH /* bird */
340 var_key.hash1 = variable_hash_1i (name, length);
341 var_key.hash2 = 0;
342#endif
343 var_slot = (struct variable **) hash_find_slot (&set->table, &var_key);
344
345 if (env_overrides && origin == o_env)
346 origin = o_env_override;
347
348 v = *var_slot;
349 if (! HASH_VACANT (v))
350 {
351 if (env_overrides && v->origin == o_env)
352 /* V came from in the environment. Since it was defined
353 before the switches were parsed, it wasn't affected by -e. */
354 v->origin = o_env_override;
355
356 /* A variable of this name is already defined.
357 If the old definition is from a stronger source
358 than this one, don't redefine it. */
359 if ((int) origin >= (int) v->origin)
360 {
361#ifdef CONFIG_WITH_VALUE_LENGTH
362 if (value_length == ~0U)
363 value_length = strlen (value);
364 else
365 assert (value_length == strlen (value));
366 if (!duplicate_value)
367 {
368 if (v->value != 0)
369 free (v->value);
370 v->value = value;
371 v->value_alloc_len = value_length + 1;
372 }
373 else
374 {
375 if ((unsigned int)v->value_alloc_len <= value_length)
376 {
377 free (v->value);
378 v->value_alloc_len = (value_length + 0x40) & ~0x3f;
379 v->value = xmalloc (v->value_alloc_len);
380 }
381 memcpy (v->value, value, value_length + 1);
382 }
383 v->value_length = value_length;
384#else
385 if (v->value != 0)
386 free (v->value);
387 v->value = xstrdup (value);
388#endif
389 if (flocp != 0)
390 v->fileinfo = *flocp;
391 else
392 v->fileinfo.filenm = 0;
393 v->origin = origin;
394 v->recursive = recursive;
395 }
396 return v;
397 }
398
399 /* Create a new variable definition and add it to the hash table. */
400
401 v = (struct variable *) xmalloc (sizeof (struct variable));
402 v->name = savestring (name, length);
403 v->length = length;
404#ifdef VARIABLE_HASH /* bird */
405 v->hash1 = variable_hash_1i (name, length);
406 v->hash2 = 0;
407#endif
408 hash_insert_at (&set->table, v, var_slot);
409#ifdef CONFIG_WITH_VALUE_LENGTH
410 if (value_length == ~0U)
411 value_length = strlen (value);
412 else
413 assert (value_length == strlen (value));
414 v->value_length = value_length;
415 if (!duplicate_value)
416 {
417 v->value_alloc_len = value_length + 1;
418 v->value = value;
419 }
420 else
421 {
422 v->value_alloc_len = (value_length + 32) & ~31;
423 v->value = xmalloc (v->value_alloc_len);
424 memcpy (v->value, value, value_length + 1);
425 }
426#else
427 v->value = xstrdup (value);
428#endif
429 if (flocp != 0)
430 v->fileinfo = *flocp;
431 else
432 v->fileinfo.filenm = 0;
433 v->origin = origin;
434 v->recursive = recursive;
435 v->special = 0;
436 v->expanding = 0;
437 v->exp_count = 0;
438 v->per_target = 0;
439 v->append = 0;
440 v->export = v_default;
441
442 v->exportable = 1;
443 if (*name != '_' && (*name < 'A' || *name > 'Z')
444 && (*name < 'a' || *name > 'z'))
445 v->exportable = 0;
446 else
447 {
448 for (++name; *name != '\0'; ++name)
449 if (*name != '_' && (*name < 'a' || *name > 'z')
450 && (*name < 'A' || *name > 'Z') && !ISDIGIT(*name))
451 break;
452
453 if (*name != '\0')
454 v->exportable = 0;
455 }
456
457 return v;
458}
459
460
461/* If the variable passed in is "special", handle its special nature.
462 Currently there are two such variables, both used for introspection:
463 .VARIABLES expands to a list of all the variables defined in this instance
464 of make.
465 .TARGETS expands to a list of all the targets defined in this
466 instance of make.
467 Returns the variable reference passed in. */
468
469#define EXPANSION_INCREMENT(_l) ((((_l) / 500) + 1) * 500)
470
471static struct variable *
472handle_special_var (struct variable *var)
473{
474 static unsigned long last_var_count = 0;
475
476
477 /* This one actually turns out to be very hard, due to the way the parser
478 records targets. The way it works is that target information is collected
479 internally until make knows the target is completely specified. It unitl
480 it sees that some new construct (a new target or variable) is defined that
481 it knows the previous one is done. In short, this means that if you do
482 this:
483
484 all:
485
486 TARGS := $(.TARGETS)
487
488 then $(TARGS) won't contain "all", because it's not until after the
489 variable is created that the previous target is completed.
490
491 Changing this would be a major pain. I think a less complex way to do it
492 would be to pre-define the target files as soon as the first line is
493 parsed, then come back and do the rest of the definition as now. That
494 would allow $(.TARGETS) to be correct without a major change to the way
495 the parser works.
496
497 if (streq (var->name, ".TARGETS"))
498 var->value = build_target_list (var->value);
499 else
500 */
501
502 if (streq (var->name, ".VARIABLES")
503 && global_variable_set.table.ht_fill != last_var_count)
504 {
505 unsigned long max = EXPANSION_INCREMENT (strlen (var->value));
506 unsigned long len;
507 char *p;
508 struct variable **vp = (struct variable **) global_variable_set.table.ht_vec;
509 struct variable **end = &vp[global_variable_set.table.ht_size];
510
511 /* Make sure we have at least MAX bytes in the allocated buffer. */
512 var->value = xrealloc (var->value, max);
513
514 /* Walk through the hash of variables, constructing a list of names. */
515 p = var->value;
516 len = 0;
517 for (; vp < end; ++vp)
518 if (!HASH_VACANT (*vp))
519 {
520 struct variable *v = *vp;
521 int l = v->length;
522
523 len += l + 1;
524 if (len > max)
525 {
526 unsigned long off = p - var->value;
527
528 max += EXPANSION_INCREMENT (l + 1);
529 var->value = xrealloc (var->value, max);
530 p = &var->value[off];
531 }
532
533 bcopy (v->name, p, l);
534 p += l;
535 *(p++) = ' ';
536 }
537 *(p-1) = '\0';
538
539 /* Remember how many variables are in our current count. Since we never
540 remove variables from the list, this is a reliable way to know whether
541 the list is up to date or needs to be recomputed. */
542
543 last_var_count = global_variable_set.table.ht_fill;
544 }
545
546 return var;
547}
548
549
550
551/* Lookup a variable whose name is a string starting at NAME
552 and with LENGTH chars. NAME need not be null-terminated.
553 Returns address of the `struct variable' containing all info
554 on the variable, or nil if no such variable is defined. */
555
556struct variable *
557lookup_variable (const char *name, unsigned int length)
558{
559 const struct variable_set_list *setlist;
560 struct variable var_key;
561
562 var_key.name = (char *) name;
563 var_key.length = length;
564#ifdef VARIABLE_HASH /* bird */
565 var_key.hash1 = variable_hash_1i (name, length);
566 var_key.hash2 = 0;
567#endif
568
569 for (setlist = current_variable_set_list;
570 setlist != 0; setlist = setlist->next)
571 {
572#ifdef VARIABLE_HASH /* bird: speed */
573 struct hash_table *ht = &setlist->set->table;
574 unsigned int hash_1 = var_key.hash1;
575 struct variable *v;
576
577 ht->ht_lookups++;
578 for (;;)
579 {
580 hash_1 &= (ht->ht_size - 1);
581 v = (struct variable *)ht->ht_vec[hash_1];
582
583 if (v == 0)
584 break;
585 if ((void *)v != hash_deleted_item)
586 {
587 if (variable_hash_cmp(&var_key, v) == 0)
588 {
589# ifdef VARIABLE_HASH_STRICT /* bird */
590 struct variable *v2 = (struct variable *) hash_find_item ((struct hash_table *) &setlist->set->table, &var_key);
591 assert(v2 == v);
592# endif
593 return v->special ? handle_special_var (v) : v;
594 }
595 ht->ht_collisions++;
596 }
597 if (!var_key.hash2)
598 var_key.hash2 = variable_hash_2i(name, length);
599 hash_1 += (var_key.hash2 | 1);
600 }
601
602#else /* !VARIABLE_HASH */
603 const struct variable_set *set = setlist->set;
604 struct variable *v;
605
606 v = (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key);
607 if (v)
608 return v->special ? handle_special_var (v) : v;
609#endif /* !VARIABLE_HASH */
610 }
611
612#ifdef VMS
613 /* since we don't read envp[] on startup, try to get the
614 variable via getenv() here. */
615 {
616 char *vname = alloca (length + 1);
617 char *value;
618 strncpy (vname, name, length);
619 vname[length] = 0;
620 value = getenv (vname);
621 if (value != 0)
622 {
623 char *sptr;
624 int scnt;
625
626 sptr = value;
627 scnt = 0;
628
629 while ((sptr = strchr (sptr, '$')))
630 {
631 scnt++;
632 sptr++;
633 }
634
635 if (scnt > 0)
636 {
637 char *nvalue;
638 char *nptr;
639
640 nvalue = alloca (strlen (value) + scnt + 1);
641 sptr = value;
642 nptr = nvalue;
643
644 while (*sptr)
645 {
646 if (*sptr == '$')
647 {
648 *nptr++ = '$';
649 *nptr++ = '$';
650 }
651 else
652 {
653 *nptr++ = *sptr;
654 }
655 sptr++;
656 }
657
658 *nptr = '\0';
659 return define_variable (vname, length, nvalue, o_env, 1);
660
661 }
662
663 return define_variable (vname, length, value, o_env, 1);
664 }
665 }
666#endif /* VMS */
667
668 return 0;
669}
670
671
672/* Lookup a variable whose name is a string starting at NAME
673 and with LENGTH chars in set SET. NAME need not be null-terminated.
674 Returns address of the `struct variable' containing all info
675 on the variable, or nil if no such variable is defined. */
676
677struct variable *
678lookup_variable_in_set (const char *name, unsigned int length,
679 const struct variable_set *set)
680{
681 struct variable var_key;
682
683 var_key.name = (char *) name;
684 var_key.length = length;
685#ifdef VARIABLE_HASH /* bird */
686 var_key.hash1 = variable_hash_1i (name, length);
687 var_key.hash2 = 0;
688#endif
689
690 return (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key);
691}
692
693
694/* Initialize FILE's variable set list. If FILE already has a variable set
695 list, the topmost variable set is left intact, but the the rest of the
696 chain is replaced with FILE->parent's setlist. If FILE is a double-colon
697 rule, then we will use the "root" double-colon target's variable set as the
698 parent of FILE's variable set.
699
700 If we're READing a makefile, don't do the pattern variable search now,
701 since the pattern variable might not have been defined yet. */
702
703void
704initialize_file_variables (struct file *file, int reading)
705{
706 struct variable_set_list *l = file->variables;
707
708 if (l == 0)
709 {
710 l = (struct variable_set_list *)
711 xmalloc (sizeof (struct variable_set_list));
712 l->set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
713 hash_init (&l->set->table, PERFILE_VARIABLE_BUCKETS,
714 variable_hash_1, variable_hash_2, variable_hash_cmp);
715 file->variables = l;
716 }
717
718 /* If this is a double-colon, then our "parent" is the "root" target for
719 this double-colon rule. Since that rule has the same name, parent,
720 etc. we can just use its variables as the "next" for ours. */
721
722 if (file->double_colon && file->double_colon != file)
723 {
724 initialize_file_variables (file->double_colon, reading);
725 l->next = file->double_colon->variables;
726 return;
727 }
728
729 if (file->parent == 0)
730 l->next = &global_setlist;
731 else
732 {
733 initialize_file_variables (file->parent, reading);
734 l->next = file->parent->variables;
735 }
736
737 /* If we're not reading makefiles and we haven't looked yet, see if
738 we can find pattern variables for this target. */
739
740 if (!reading && !file->pat_searched)
741 {
742 struct pattern_var *p;
743
744 p = lookup_pattern_var (0, file->name);
745 if (p != 0)
746 {
747 struct variable_set_list *global = current_variable_set_list;
748
749 /* We found at least one. Set up a new variable set to accumulate
750 all the pattern variables that match this target. */
751
752 file->pat_variables = create_new_variable_set ();
753 current_variable_set_list = file->pat_variables;
754
755 do
756 {
757 /* We found one, so insert it into the set. */
758
759 struct variable *v;
760
761 if (p->variable.flavor == f_simple)
762 {
763 v = define_variable_loc (
764 p->variable.name, strlen (p->variable.name),
765 p->variable.value, p->variable.origin,
766 0, &p->variable.fileinfo);
767
768 v->flavor = f_simple;
769 }
770 else
771 {
772 v = do_variable_definition (
773 &p->variable.fileinfo, p->variable.name,
774 p->variable.value, p->variable.origin,
775 p->variable.flavor, 1);
776 }
777
778 /* Also mark it as a per-target and copy export status. */
779 v->per_target = p->variable.per_target;
780 v->export = p->variable.export;
781 }
782 while ((p = lookup_pattern_var (p, file->name)) != 0);
783
784 current_variable_set_list = global;
785 }
786 file->pat_searched = 1;
787 }
788
789 /* If we have a pattern variable match, set it up. */
790
791 if (file->pat_variables != 0)
792 {
793 file->pat_variables->next = l->next;
794 l->next = file->pat_variables;
795 }
796}
797
798
799/* Pop the top set off the current variable set list,
800 and free all its storage. */
801
802struct variable_set_list *
803create_new_variable_set (void)
804{
805 register struct variable_set_list *setlist;
806 register struct variable_set *set;
807
808 set = (struct variable_set *) xmalloc (sizeof (struct variable_set));
809 hash_init (&set->table, SMALL_SCOPE_VARIABLE_BUCKETS,
810 variable_hash_1, variable_hash_2, variable_hash_cmp);
811
812 setlist = (struct variable_set_list *)
813 xmalloc (sizeof (struct variable_set_list));
814 setlist->set = set;
815 setlist->next = current_variable_set_list;
816
817 return setlist;
818}
819
820static void
821free_variable_name_and_value (const void *item)
822{
823 struct variable *v = (struct variable *) item;
824 free (v->name);
825 free (v->value);
826}
827
828void
829free_variable_set (struct variable_set_list *list)
830{
831 hash_map (&list->set->table, free_variable_name_and_value);
832 hash_free (&list->set->table, 1);
833 free ((char *) list->set);
834 free ((char *) list);
835}
836
837/* Create a new variable set and push it on the current setlist.
838 If we're pushing a global scope (that is, the current scope is the global
839 scope) then we need to "push" it the other way: file variable sets point
840 directly to the global_setlist so we need to replace that with the new one.
841 */
842
843struct variable_set_list *
844push_new_variable_scope (void)
845{
846 current_variable_set_list = create_new_variable_set();
847 if (current_variable_set_list->next == &global_setlist)
848 {
849 /* It was the global, so instead of new -> &global we want to replace
850 &global with the new one and have &global -> new, with current still
851 pointing to &global */
852 struct variable_set *set = current_variable_set_list->set;
853 current_variable_set_list->set = global_setlist.set;
854 global_setlist.set = set;
855 current_variable_set_list->next = global_setlist.next;
856 global_setlist.next = current_variable_set_list;
857 current_variable_set_list = &global_setlist;
858 }
859 return (current_variable_set_list);
860}
861
862void
863pop_variable_scope (void)
864{
865 struct variable_set_list *setlist;
866 struct variable_set *set;
867
868 /* Can't call this if there's no scope to pop! */
869 assert(current_variable_set_list->next != NULL);
870
871 if (current_variable_set_list != &global_setlist)
872 {
873 /* We're not pointing to the global setlist, so pop this one. */
874 setlist = current_variable_set_list;
875 set = setlist->set;
876 current_variable_set_list = setlist->next;
877 }
878 else
879 {
880 /* This set is the one in the global_setlist, but there is another global
881 set beyond that. We want to copy that set to global_setlist, then
882 delete what used to be in global_setlist. */
883 setlist = global_setlist.next;
884 set = global_setlist.set;
885 global_setlist.set = setlist->set;
886 global_setlist.next = setlist->next;
887 }
888
889 /* Free the one we no longer need. */
890 free ((char *) setlist);
891 hash_map (&set->table, free_variable_name_and_value);
892 hash_free (&set->table, 1);
893 free ((char *) set);
894}
895
896
897/* Merge FROM_SET into TO_SET, freeing unused storage in FROM_SET. */
898
899static void
900merge_variable_sets (struct variable_set *to_set,
901 struct variable_set *from_set)
902{
903 struct variable **from_var_slot = (struct variable **) from_set->table.ht_vec;
904 struct variable **from_var_end = from_var_slot + from_set->table.ht_size;
905
906 for ( ; from_var_slot < from_var_end; from_var_slot++)
907 if (! HASH_VACANT (*from_var_slot))
908 {
909 struct variable *from_var = *from_var_slot;
910 struct variable **to_var_slot
911 = (struct variable **) hash_find_slot (&to_set->table, *from_var_slot);
912 if (HASH_VACANT (*to_var_slot))
913 hash_insert_at (&to_set->table, from_var, to_var_slot);
914 else
915 {
916 /* GKM FIXME: delete in from_set->table */
917 free (from_var->value);
918 free (from_var);
919 }
920 }
921}
922
923/* Merge SETLIST1 into SETLIST0, freeing unused storage in SETLIST1. */
924
925void
926merge_variable_set_lists (struct variable_set_list **setlist0,
927 struct variable_set_list *setlist1)
928{
929 struct variable_set_list *to = *setlist0;
930 struct variable_set_list *last0 = 0;
931
932 /* If there's nothing to merge, stop now. */
933 if (!setlist1)
934 return;
935
936 /* This loop relies on the fact that all setlists terminate with the global
937 setlist (before NULL). If that's not true, arguably we SHOULD die. */
938 if (to)
939 while (setlist1 != &global_setlist && to != &global_setlist)
940 {
941 struct variable_set_list *from = setlist1;
942 setlist1 = setlist1->next;
943
944 merge_variable_sets (to->set, from->set);
945
946 last0 = to;
947 to = to->next;
948 }
949
950 if (setlist1 != &global_setlist)
951 {
952 if (last0 == 0)
953 *setlist0 = setlist1;
954 else
955 last0->next = setlist1;
956 }
957}
958
959
960/* Define the automatic variables, and record the addresses
961 of their structures so we can change their values quickly. */
962
963void
964define_automatic_variables (void)
965{
966#if defined(WINDOWS32) || defined(__EMX__)
967 extern char* default_shell;
968#else
969 extern char default_shell[];
970#endif
971 register struct variable *v;
972 char buf[200];
973#ifdef KMK
974 const char *envvar;
975#endif
976
977 sprintf (buf, "%u", makelevel);
978 (void) define_variable (MAKELEVEL_NAME, MAKELEVEL_LENGTH, buf, o_env, 0);
979
980 sprintf (buf, "%s%s%s",
981 version_string,
982 (remote_description == 0 || remote_description[0] == '\0')
983 ? "" : "-",
984 (remote_description == 0 || remote_description[0] == '\0')
985 ? "" : remote_description);
986 (void) define_variable ("MAKE_VERSION", 12, buf, o_default, 0);
987
988#ifdef KMK
989 /* Define KMK_VERSION to indicate kMk. */
990 (void) define_variable ("KMK_VERSION", 11, buf, o_default, 0);
991
992 /* Define KBUILD_VERSION* */
993 sprintf (buf, "%d", KBUILD_VERSION_MAJOR);
994 (void) define_variable ("KBUILD_VERSION_MAJOR", sizeof("KBUILD_VERSION_MAJOR") - 1,
995 buf, o_default, 0);
996 sprintf (buf, "%d", KBUILD_VERSION_MINOR);
997 (void) define_variable ("KBUILD_VERSION_MINOR", sizeof("KBUILD_VERSION_MINOR") - 1,
998 buf, o_default, 0);
999 sprintf (buf, "%d", KBUILD_VERSION_PATCH);
1000 (void) define_variable ("KBUILD_VERSION_PATCH", sizeof("KBUILD_VERSION_PATCH") - 1,
1001 buf, o_default, 0);
1002
1003 sprintf (buf, "%d.%d.%d", KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH);
1004 (void) define_variable ("KBUILD_VERSION", sizeof("KBUILD_VERSION") - 1,
1005 buf, o_default, 0);
1006
1007 /* The build platform defaults. */
1008 envvar = getenv("BUILD_PLATFORM");
1009 if (!envvar)
1010 (void) define_variable ("BUILD_PLATFORM", sizeof("BUILD_PLATFORM") - 1,
1011 BUILD_PLATFORM, o_default, 0);
1012 envvar = getenv("BUILD_PLATFORM_ARCH");
1013 if (!envvar)
1014 (void) define_variable ("BUILD_PLATFORM_ARCH", sizeof("BUILD_PLATFORM_ARCH") - 1,
1015 BUILD_PLATFORM_ARCH, o_default, 0);
1016 envvar = getenv("BUILD_PLATFORM_CPU");
1017 if (!envvar)
1018 (void) define_variable ("BUILD_PLATFORM_CPU", sizeof("BUILD_PLATFORM_CPU") - 1,
1019 BUILD_PLATFORM_CPU, o_default, 0);
1020
1021 /* Define KMK_FEATURES to indicate various working KMK features. */
1022# if defined(CONFIG_WITH_TOUPPER_TOLOWER) \
1023 && defined(CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE) \
1024 && defined(KMK_HELPERS)
1025 (void) define_variable ("KMK_FEATURES", 12,
1026 "abspath"
1027 " toupper tolower"
1028 " comp-vars"
1029 " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one"
1030 , o_default, 0);
1031# else /* MSC can't deal with strings mixed with #if/#endif, thus the slow way. */
1032 strcpy(buf, "abspath");
1033# if defined(CONFIG_WITH_TOUPPER_TOLOWER)
1034 strcat(buf, " toupper tolower");
1035# endif
1036# if defined(CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE)
1037 strcat(buf, " comp-vars");
1038# endif
1039# ifdef KMK_HELPERS
1040 strcat(buf, " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one");
1041# endif
1042 (void) define_variable ("KMK_FEATURES", 12, buf, o_default, 0);
1043# endif
1044
1045#endif /* KMK */
1046
1047#ifdef CONFIG_WITH_KMK_BUILTIN
1048 /* The supported kMk Builtin commands. */
1049 (void) define_variable ("KMK_BUILTIN", 11, "append cp echo install ln mkdir rm", o_default, 0);
1050#endif
1051
1052#ifdef __MSDOS__
1053 /* Allow to specify a special shell just for Make,
1054 and use $COMSPEC as the default $SHELL when appropriate. */
1055 {
1056 static char shell_str[] = "SHELL";
1057 const int shlen = sizeof (shell_str) - 1;
1058 struct variable *mshp = lookup_variable ("MAKESHELL", 9);
1059 struct variable *comp = lookup_variable ("COMSPEC", 7);
1060
1061 /* Make $MAKESHELL override $SHELL even if -e is in effect. */
1062 if (mshp)
1063 (void) define_variable (shell_str, shlen,
1064 mshp->value, o_env_override, 0);
1065 else if (comp)
1066 {
1067 /* $COMSPEC shouldn't override $SHELL. */
1068 struct variable *shp = lookup_variable (shell_str, shlen);
1069
1070 if (!shp)
1071 (void) define_variable (shell_str, shlen, comp->value, o_env, 0);
1072 }
1073 }
1074#elif defined(__EMX__)
1075 {
1076 static char shell_str[] = "SHELL";
1077 const int shlen = sizeof (shell_str) - 1;
1078 struct variable *shell = lookup_variable (shell_str, shlen);
1079 struct variable *replace = lookup_variable ("MAKESHELL", 9);
1080
1081 /* if $MAKESHELL is defined in the environment assume o_env_override */
1082 if (replace && *replace->value && replace->origin == o_env)
1083 replace->origin = o_env_override;
1084
1085 /* if $MAKESHELL is not defined use $SHELL but only if the variable
1086 did not come from the environment */
1087 if (!replace || !*replace->value)
1088 if (shell && *shell->value && (shell->origin == o_env
1089 || shell->origin == o_env_override))
1090 {
1091 /* overwrite whatever we got from the environment */
1092 free(shell->value);
1093 shell->value = xstrdup (default_shell);
1094 shell->origin = o_default;
1095 }
1096
1097 /* Some people do not like cmd to be used as the default
1098 if $SHELL is not defined in the Makefile.
1099 With -DNO_CMD_DEFAULT you can turn off this behaviour */
1100# ifndef NO_CMD_DEFAULT
1101 /* otherwise use $COMSPEC */
1102 if (!replace || !*replace->value)
1103 replace = lookup_variable ("COMSPEC", 7);
1104
1105 /* otherwise use $OS2_SHELL */
1106 if (!replace || !*replace->value)
1107 replace = lookup_variable ("OS2_SHELL", 9);
1108# else
1109# warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell
1110# endif
1111
1112 if (replace && *replace->value)
1113 /* overwrite $SHELL */
1114 (void) define_variable (shell_str, shlen, replace->value,
1115 replace->origin, 0);
1116 else
1117 /* provide a definition if there is none */
1118 (void) define_variable (shell_str, shlen, default_shell,
1119 o_default, 0);
1120 }
1121
1122#endif
1123
1124 /* This won't override any definition, but it will provide one if there
1125 isn't one there. */
1126 v = define_variable ("SHELL", 5, default_shell, o_default, 0);
1127
1128 /* On MSDOS we do use SHELL from environment, since it isn't a standard
1129 environment variable on MSDOS, so whoever sets it, does that on purpose.
1130 On OS/2 we do not use SHELL from environment but we have already handled
1131 that problem above. */
1132#if !defined(__MSDOS__) && !defined(__EMX__)
1133 /* Don't let SHELL come from the environment. */
1134 if (*v->value == '\0' || v->origin == o_env || v->origin == o_env_override)
1135 {
1136 free (v->value);
1137 v->origin = o_file;
1138 v->value = xstrdup (default_shell);
1139#ifdef CONFIG_WITH_VALUE_LENGTH
1140 v->value_length = strlen (v->value);
1141 v->value_alloc_len = v->value_length + 1;
1142#endif
1143 }
1144#endif
1145
1146 /* Make sure MAKEFILES gets exported if it is set. */
1147 v = define_variable ("MAKEFILES", 9, "", o_default, 0);
1148 v->export = v_ifset;
1149
1150 /* Define the magic D and F variables in terms of
1151 the automatic variables they are variations of. */
1152
1153#ifdef VMS
1154 define_variable ("@D", 2, "$(dir $@)", o_automatic, 1);
1155 define_variable ("%D", 2, "$(dir $%)", o_automatic, 1);
1156 define_variable ("*D", 2, "$(dir $*)", o_automatic, 1);
1157 define_variable ("<D", 2, "$(dir $<)", o_automatic, 1);
1158 define_variable ("?D", 2, "$(dir $?)", o_automatic, 1);
1159 define_variable ("^D", 2, "$(dir $^)", o_automatic, 1);
1160 define_variable ("+D", 2, "$(dir $+)", o_automatic, 1);
1161#else
1162 define_variable ("@D", 2, "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
1163 define_variable ("%D", 2, "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
1164 define_variable ("*D", 2, "$(patsubst %/,%,$(dir $*))", o_automatic, 1);
1165 define_variable ("<D", 2, "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
1166 define_variable ("?D", 2, "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
1167 define_variable ("^D", 2, "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
1168 define_variable ("+D", 2, "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
1169#endif
1170 define_variable ("@F", 2, "$(notdir $@)", o_automatic, 1);
1171 define_variable ("%F", 2, "$(notdir $%)", o_automatic, 1);
1172 define_variable ("*F", 2, "$(notdir $*)", o_automatic, 1);
1173 define_variable ("<F", 2, "$(notdir $<)", o_automatic, 1);
1174 define_variable ("?F", 2, "$(notdir $?)", o_automatic, 1);
1175 define_variable ("^F", 2, "$(notdir $^)", o_automatic, 1);
1176 define_variable ("+F", 2, "$(notdir $+)", o_automatic, 1);
1177}
1178
1179
1180int export_all_variables;
1181
1182/* Create a new environment for FILE's commands.
1183 If FILE is nil, this is for the `shell' function.
1184 The child's MAKELEVEL variable is incremented. */
1185
1186char **
1187target_environment (struct file *file)
1188{
1189 struct variable_set_list *set_list;
1190 register struct variable_set_list *s;
1191 struct hash_table table;
1192 struct variable **v_slot;
1193 struct variable **v_end;
1194 struct variable makelevel_key;
1195 char **result_0;
1196 char **result;
1197
1198 if (file == 0)
1199 set_list = current_variable_set_list;
1200 else
1201 set_list = file->variables;
1202
1203 hash_init (&table, VARIABLE_BUCKETS,
1204 variable_hash_1, variable_hash_2, variable_hash_cmp);
1205
1206 /* Run through all the variable sets in the list,
1207 accumulating variables in TABLE. */
1208 for (s = set_list; s != 0; s = s->next)
1209 {
1210 struct variable_set *set = s->set;
1211 v_slot = (struct variable **) set->table.ht_vec;
1212 v_end = v_slot + set->table.ht_size;
1213 for ( ; v_slot < v_end; v_slot++)
1214 if (! HASH_VACANT (*v_slot))
1215 {
1216 struct variable **new_slot;
1217 struct variable *v = *v_slot;
1218
1219 /* If this is a per-target variable and it hasn't been touched
1220 already then look up the global version and take its export
1221 value. */
1222 if (v->per_target && v->export == v_default)
1223 {
1224 struct variable *gv;
1225
1226 gv = lookup_variable_in_set (v->name, strlen(v->name),
1227 &global_variable_set);
1228 if (gv)
1229 v->export = gv->export;
1230 }
1231
1232 switch (v->export)
1233 {
1234 case v_default:
1235 if (v->origin == o_default || v->origin == o_automatic)
1236 /* Only export default variables by explicit request. */
1237 continue;
1238
1239 /* The variable doesn't have a name that can be exported. */
1240 if (! v->exportable)
1241 continue;
1242
1243 if (! export_all_variables
1244 && v->origin != o_command
1245 && v->origin != o_env && v->origin != o_env_override)
1246 continue;
1247 break;
1248
1249 case v_export:
1250 break;
1251
1252 case v_noexport:
1253 /* If this is the SHELL variable and it's not exported, then
1254 add the value from our original environment. */
1255 if (streq (v->name, "SHELL"))
1256 {
1257 extern struct variable shell_var;
1258 v = &shell_var;
1259 break;
1260 }
1261 continue;
1262
1263 case v_ifset:
1264 if (v->origin == o_default)
1265 continue;
1266 break;
1267 }
1268
1269 new_slot = (struct variable **) hash_find_slot (&table, v);
1270 if (HASH_VACANT (*new_slot))
1271 hash_insert_at (&table, v, new_slot);
1272 }
1273 }
1274
1275 makelevel_key.name = MAKELEVEL_NAME;
1276 makelevel_key.length = MAKELEVEL_LENGTH;
1277#ifdef VARIABLE_HASH /* bird */
1278 makelevel_key.hash1 = variable_hash_1i (MAKELEVEL_NAME, MAKELEVEL_LENGTH);
1279 makelevel_key.hash2 = 0;
1280#endif
1281 hash_delete (&table, &makelevel_key);
1282
1283 result = result_0 = (char **) xmalloc ((table.ht_fill + 2) * sizeof (char *));
1284
1285 v_slot = (struct variable **) table.ht_vec;
1286 v_end = v_slot + table.ht_size;
1287 for ( ; v_slot < v_end; v_slot++)
1288 if (! HASH_VACANT (*v_slot))
1289 {
1290 struct variable *v = *v_slot;
1291
1292 /* If V is recursively expanded and didn't come from the environment,
1293 expand its value. If it came from the environment, it should
1294 go back into the environment unchanged. */
1295 if (v->recursive
1296 && v->origin != o_env && v->origin != o_env_override)
1297 {
1298 char *value = recursively_expand_for_file (v, file);
1299#ifdef WINDOWS32
1300 if (strcmp(v->name, "Path") == 0 ||
1301 strcmp(v->name, "PATH") == 0)
1302 convert_Path_to_windows32(value, ';');
1303#endif
1304 *result++ = concat (v->name, "=", value);
1305 free (value);
1306 }
1307 else
1308 {
1309#ifdef WINDOWS32
1310 if (strcmp(v->name, "Path") == 0 ||
1311 strcmp(v->name, "PATH") == 0)
1312 convert_Path_to_windows32(v->value, ';');
1313#endif
1314 *result++ = concat (v->name, "=", v->value);
1315 }
1316 }
1317
1318 *result = (char *) xmalloc (100);
1319 (void) sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1);
1320 *++result = 0;
1321
1322 hash_free (&table, 0);
1323
1324 return result_0;
1325}
1326
1327
1328#ifdef CONFIG_WITH_VALUE_LENGTH
1329static struct variable *
1330do_variable_definition_append (const struct floc *flocp, struct variable *v, char *value,
1331 enum variable_origin origin)
1332{
1333 if (env_overrides && origin == o_env)
1334 origin = o_env_override;
1335
1336 if (env_overrides && v->origin == o_env)
1337 /* V came from in the environment. Since it was defined
1338 before the switches were parsed, it wasn't affected by -e. */
1339 v->origin = o_env_override;
1340
1341 /* A variable of this name is already defined.
1342 If the old definition is from a stronger source
1343 than this one, don't redefine it. */
1344 if ((int) origin < (int) v->origin)
1345 return v;
1346 v->origin = origin;
1347
1348 /* location */
1349 if (flocp != 0)
1350 v->fileinfo = *flocp;
1351
1352 /* The juicy bits, append the specified value to the variable
1353 This is a heavily exercied code path in kBuild. */
1354 if (v->recursive)
1355 {
1356 /* The previous definition of the variable was recursive.
1357 The new value is the unexpanded old and new values. */
1358 unsigned int value_len = strlen (value);
1359 unsigned int new_value_len = value_len + (v->value_length != 0 ? 1 + v->value_length : 0);
1360
1361 /* adjust the size. */
1362 if ((unsigned)v->value_alloc_len <= new_value_len)
1363 {
1364 v->value_alloc_len = (new_value_len + 0x80) + 0x7f;
1365 v->value = xrealloc (v->value, v->value_alloc_len);
1366 }
1367
1368 /* insert the new bits */
1369 if (v->value_length != 0)
1370 {
1371 v->value[v->value_length] = ' ';
1372 memcpy (&v->value[v->value_length + 1], value, value_len + 1);
1373 }
1374 else
1375 memcpy (v->value, value, value_len + 1);
1376 v->value_length = new_value_len;
1377 }
1378 else
1379 {
1380 /* The previous definition of the variable was simple.
1381 The new value comes from the old value, which was expanded
1382 when it was set; and from the expanded new value. */
1383 append_expanded_string_to_variable(v, value);
1384 }
1385
1386 /* update the variable */
1387 return v;
1388}
1389#endif /* CONFIG_WITH_VALUE_LENGTH */
1390
1391
1392/* Given a variable, a value, and a flavor, define the variable.
1393 See the try_variable_definition() function for details on the parameters. */
1394
1395struct variable *
1396do_variable_definition (const struct floc *flocp, const char *varname,
1397 char *value, enum variable_origin origin,
1398 enum variable_flavor flavor, int target_var)
1399{
1400 char *p, *alloc_value = NULL;
1401 struct variable *v;
1402 int append = 0;
1403 int conditional = 0;
1404 const size_t varname_len = strlen (varname); /* bird */
1405# ifdef CONFIG_WITH_VALUE_LENGTH
1406 unsigned int value_len = ~0U;
1407# endif
1408
1409 /* Calculate the variable's new value in VALUE. */
1410
1411 switch (flavor)
1412 {
1413 default:
1414 case f_bogus:
1415 /* Should not be possible. */
1416 abort ();
1417 case f_simple:
1418 /* A simple variable definition "var := value". Expand the value.
1419 We have to allocate memory since otherwise it'll clobber the
1420 variable buffer, and we may still need that if we're looking at a
1421 target-specific variable. */
1422 p = alloc_value = allocated_variable_expand (value);
1423 break;
1424 case f_conditional:
1425 /* A conditional variable definition "var ?= value".
1426 The value is set IFF the variable is not defined yet. */
1427 v = lookup_variable (varname, varname_len);
1428 if (v)
1429 return v;
1430
1431 conditional = 1;
1432 flavor = f_recursive;
1433 /* FALLTHROUGH */
1434 case f_recursive:
1435 /* A recursive variable definition "var = value".
1436 The value is used verbatim. */
1437 p = value;
1438 break;
1439 case f_append:
1440 {
1441 /* If we have += but we're in a target variable context, we want to
1442 append only with other variables in the context of this target. */
1443 if (target_var)
1444 {
1445 append = 1;
1446 v = lookup_variable_in_set (varname, varname_len,
1447 current_variable_set_list->set);
1448
1449 /* Don't append from the global set if a previous non-appending
1450 target-specific variable definition exists. */
1451 if (v && !v->append)
1452 append = 0;
1453 }
1454 else
1455 v = lookup_variable (varname, varname_len);
1456
1457 if (v == 0)
1458 {
1459 /* There was no old value.
1460 This becomes a normal recursive definition. */
1461 p = value;
1462 flavor = f_recursive;
1463 }
1464 else
1465 {
1466#ifdef CONFIG_WITH_VALUE_LENGTH
1467 v->append = append;
1468 return do_variable_definition_append (flocp, v, value, origin);
1469#else /* !CONFIG_WITH_VALUE_LENGTH */
1470
1471 /* Paste the old and new values together in VALUE. */
1472
1473 unsigned int oldlen, vallen;
1474 char *val;
1475
1476 val = value;
1477 if (v->recursive)
1478 /* The previous definition of the variable was recursive.
1479 The new value is the unexpanded old and new values. */
1480 flavor = f_recursive;
1481 else
1482 /* The previous definition of the variable was simple.
1483 The new value comes from the old value, which was expanded
1484 when it was set; and from the expanded new value. Allocate
1485 memory for the expansion as we may still need the rest of the
1486 buffer if we're looking at a target-specific variable. */
1487 val = alloc_value = allocated_variable_expand (val);
1488
1489 oldlen = strlen (v->value);
1490 vallen = strlen (val);
1491 p = (char *) alloca (oldlen + 1 + vallen + 1);
1492 bcopy (v->value, p, oldlen);
1493 p[oldlen] = ' ';
1494 bcopy (val, &p[oldlen + 1], vallen + 1);
1495#endif /* !CONFIG_WITH_VALUE_LENGTH */
1496 }
1497 }
1498 }
1499
1500#ifdef __MSDOS__
1501 /* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1502 non-Unix systems don't conform to this default configuration (in
1503 fact, most of them don't even have `/bin'). On the other hand,
1504 $SHELL in the environment, if set, points to the real pathname of
1505 the shell.
1506 Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1507 the Makefile override $SHELL from the environment. But first, we
1508 look for the basename of the shell in the directory where SHELL=
1509 points, and along the $PATH; if it is found in any of these places,
1510 we define $SHELL to be the actual pathname of the shell. Thus, if
1511 you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1512 your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1513 defining SHELL to be "d:/unix/bash.exe". */
1514 if ((origin == o_file || origin == o_override)
1515 && strcmp (varname, "SHELL") == 0)
1516 {
1517 PATH_VAR (shellpath);
1518 extern char * __dosexec_find_on_path (const char *, char *[], char *);
1519
1520 /* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1521 if (__dosexec_find_on_path (p, (char **)0, shellpath))
1522 {
1523 char *p;
1524
1525 for (p = shellpath; *p; p++)
1526 {
1527 if (*p == '\\')
1528 *p = '/';
1529 }
1530 v = define_variable_loc (varname, varname_len,
1531 shellpath, origin, flavor == f_recursive,
1532 flocp);
1533 }
1534 else
1535 {
1536 char *shellbase, *bslash;
1537 struct variable *pathv = lookup_variable ("PATH", 4);
1538 char *path_string;
1539 char *fake_env[2];
1540 size_t pathlen = 0;
1541
1542 shellbase = strrchr (p, '/');
1543 bslash = strrchr (p, '\\');
1544 if (!shellbase || bslash > shellbase)
1545 shellbase = bslash;
1546 if (!shellbase && p[1] == ':')
1547 shellbase = p + 1;
1548 if (shellbase)
1549 shellbase++;
1550 else
1551 shellbase = p;
1552
1553 /* Search for the basename of the shell (with standard
1554 executable extensions) along the $PATH. */
1555 if (pathv)
1556 pathlen = strlen (pathv->value);
1557 path_string = (char *)xmalloc (5 + pathlen + 2 + 1);
1558 /* On MSDOS, current directory is considered as part of $PATH. */
1559 sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1560 fake_env[0] = path_string;
1561 fake_env[1] = (char *)0;
1562 if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1563 {
1564 char *p;
1565
1566 for (p = shellpath; *p; p++)
1567 {
1568 if (*p == '\\')
1569 *p = '/';
1570 }
1571 v = define_variable_loc (varname, varname_len,
1572 shellpath, origin,
1573 flavor == f_recursive, flocp);
1574 }
1575 else
1576 v = lookup_variable (varname, varname_len);
1577
1578 free (path_string);
1579 }
1580 }
1581 else
1582#endif /* __MSDOS__ */
1583#ifdef WINDOWS32
1584 if ( varname_len == sizeof("SHELL") - 1 /* bird */
1585 && (origin == o_file || origin == o_override || origin == o_command)
1586 && streq (varname, "SHELL"))
1587 {
1588 extern char *default_shell;
1589
1590 /* Call shell locator function. If it returns TRUE, then
1591 set no_default_sh_exe to indicate sh was found and
1592 set new value for SHELL variable. */
1593
1594 if (find_and_set_default_shell (p))
1595 {
1596 v = define_variable_in_set (varname, varname_len, default_shell,
1597# ifdef CONFIG_WITH_VALUE_LENGTH
1598 ~0U, 1 /* duplicate_value */,
1599# endif
1600 origin, flavor == f_recursive,
1601 (target_var
1602 ? current_variable_set_list->set
1603 : NULL),
1604 flocp);
1605 no_default_sh_exe = 0;
1606 }
1607 else
1608 v = lookup_variable (varname, varname_len);
1609# ifdef CONFIG_WITH_VALUE_LENGTH
1610 if (alloc_value)
1611 free (alloc_value);
1612# endif
1613 }
1614 else
1615#endif
1616
1617 /* If we are defining variables inside an $(eval ...), we might have a
1618 different variable context pushed, not the global context (maybe we're
1619 inside a $(call ...) or something. Since this function is only ever
1620 invoked in places where we want to define globally visible variables,
1621 make sure we define this variable in the global set. */
1622
1623 v = define_variable_in_set (varname, varname_len, p,
1624#ifdef CONFIG_WITH_VALUE_LENGTH
1625 value_len, !alloc_value,
1626#endif
1627 origin, flavor == f_recursive,
1628 (target_var
1629 ? current_variable_set_list->set : NULL),
1630 flocp);
1631 v->append = append;
1632 v->conditional = conditional;
1633
1634#ifndef CONFIG_WITH_VALUE_LENGTH
1635 if (alloc_value)
1636 free (alloc_value);
1637#endif
1638
1639 return v;
1640}
1641
1642
1643/* Try to interpret LINE (a null-terminated string) as a variable definition.
1644
1645 ORIGIN may be o_file, o_override, o_env, o_env_override,
1646 or o_command specifying that the variable definition comes
1647 from a makefile, an override directive, the environment with
1648 or without the -e switch, or the command line.
1649
1650 See the comments for parse_variable_definition().
1651
1652 If LINE was recognized as a variable definition, a pointer to its `struct
1653 variable' is returned. If LINE is not a variable definition, NULL is
1654 returned. */
1655
1656struct variable *
1657parse_variable_definition (struct variable *v, char *line)
1658{
1659 register int c;
1660 register char *p = line;
1661 register char *beg;
1662 register char *end;
1663 enum variable_flavor flavor = f_bogus;
1664 char *name;
1665
1666 while (1)
1667 {
1668 c = *p++;
1669 if (c == '\0' || c == '#')
1670 return 0;
1671 if (c == '=')
1672 {
1673 end = p - 1;
1674 flavor = f_recursive;
1675 break;
1676 }
1677 else if (c == ':')
1678 if (*p == '=')
1679 {
1680 end = p++ - 1;
1681 flavor = f_simple;
1682 break;
1683 }
1684 else
1685 /* A colon other than := is a rule line, not a variable defn. */
1686 return 0;
1687 else if (c == '+' && *p == '=')
1688 {
1689 end = p++ - 1;
1690 flavor = f_append;
1691 break;
1692 }
1693 else if (c == '?' && *p == '=')
1694 {
1695 end = p++ - 1;
1696 flavor = f_conditional;
1697 break;
1698 }
1699 else if (c == '$')
1700 {
1701 /* This might begin a variable expansion reference. Make sure we
1702 don't misrecognize chars inside the reference as =, := or +=. */
1703 char closeparen;
1704 int count;
1705 c = *p++;
1706 if (c == '(')
1707 closeparen = ')';
1708 else if (c == '{')
1709 closeparen = '}';
1710 else
1711 continue; /* Nope. */
1712
1713 /* P now points past the opening paren or brace.
1714 Count parens or braces until it is matched. */
1715 count = 0;
1716 for (; *p != '\0'; ++p)
1717 {
1718 if (*p == c)
1719 ++count;
1720 else if (*p == closeparen && --count < 0)
1721 {
1722 ++p;
1723 break;
1724 }
1725 }
1726 }
1727 }
1728 v->flavor = flavor;
1729
1730 beg = next_token (line);
1731 while (end > beg && isblank ((unsigned char)end[-1]))
1732 --end;
1733 p = next_token (p);
1734 v->value = p;
1735#ifdef CONFIG_WITH_VALUE_LENGTH
1736 v->value_length = v->value_alloc_len = -1;
1737#endif
1738
1739 /* Expand the name, so "$(foo)bar = baz" works. */
1740 name = (char *) alloca (end - beg + 1);
1741 bcopy (beg, name, end - beg);
1742 name[end - beg] = '\0';
1743 v->name = allocated_variable_expand (name);
1744
1745 if (v->name[0] == '\0')
1746 fatal (&v->fileinfo, _("empty variable name"));
1747
1748 return v;
1749}
1750
1751
1752/* Try to interpret LINE (a null-terminated string) as a variable definition.
1753
1754 ORIGIN may be o_file, o_override, o_env, o_env_override,
1755 or o_command specifying that the variable definition comes
1756 from a makefile, an override directive, the environment with
1757 or without the -e switch, or the command line.
1758
1759 See the comments for parse_variable_definition().
1760
1761 If LINE was recognized as a variable definition, a pointer to its `struct
1762 variable' is returned. If LINE is not a variable definition, NULL is
1763 returned. */
1764
1765struct variable *
1766try_variable_definition (const struct floc *flocp, char *line,
1767 enum variable_origin origin, int target_var)
1768{
1769 struct variable v;
1770 struct variable *vp;
1771
1772 if (flocp != 0)
1773 v.fileinfo = *flocp;
1774 else
1775 v.fileinfo.filenm = 0;
1776
1777 if (!parse_variable_definition (&v, line))
1778 return 0;
1779
1780 vp = do_variable_definition (flocp, v.name, v.value,
1781 origin, v.flavor, target_var);
1782
1783 free (v.name);
1784
1785 return vp;
1786}
1787
1788
1789/* Print information for variable V, prefixing it with PREFIX. */
1790
1791static void
1792print_variable (const void *item, void *arg)
1793{
1794 const struct variable *v = (struct variable *) item;
1795 const char *prefix = (char *) arg;
1796 const char *origin;
1797
1798 switch (v->origin)
1799 {
1800 case o_default:
1801 origin = _("default");
1802 break;
1803 case o_env:
1804 origin = _("environment");
1805 break;
1806 case o_file:
1807 origin = _("makefile");
1808 break;
1809 case o_env_override:
1810 origin = _("environment under -e");
1811 break;
1812 case o_command:
1813 origin = _("command line");
1814 break;
1815 case o_override:
1816 origin = _("`override' directive");
1817 break;
1818 case o_automatic:
1819 origin = _("automatic");
1820 break;
1821 case o_invalid:
1822 default:
1823 abort ();
1824 }
1825 fputs ("# ", stdout);
1826 fputs (origin, stdout);
1827 if (v->fileinfo.filenm)
1828 printf (_(" (from `%s', line %lu)"),
1829 v->fileinfo.filenm, v->fileinfo.lineno);
1830 putchar ('\n');
1831 fputs (prefix, stdout);
1832
1833 /* Is this a `define'? */
1834 if (v->recursive && strchr (v->value, '\n') != 0)
1835 printf ("define %s\n%s\nendef\n", v->name, v->value);
1836 else
1837 {
1838 register char *p;
1839
1840 printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1841
1842 /* Check if the value is just whitespace. */
1843 p = next_token (v->value);
1844 if (p != v->value && *p == '\0')
1845 /* All whitespace. */
1846 printf ("$(subst ,,%s)", v->value);
1847 else if (v->recursive)
1848 fputs (v->value, stdout);
1849 else
1850 /* Double up dollar signs. */
1851 for (p = v->value; *p != '\0'; ++p)
1852 {
1853 if (*p == '$')
1854 putchar ('$');
1855 putchar (*p);
1856 }
1857 putchar ('\n');
1858 }
1859}
1860
1861
1862/* Print all the variables in SET. PREFIX is printed before
1863 the actual variable definitions (everything else is comments). */
1864
1865void
1866print_variable_set (struct variable_set *set, char *prefix)
1867{
1868 hash_map_arg (&set->table, print_variable, prefix);
1869
1870 fputs (_("# variable set hash-table stats:\n"), stdout);
1871 fputs ("# ", stdout);
1872 hash_print_stats (&set->table, stdout);
1873 putc ('\n', stdout);
1874}
1875
1876/* Print the data base of variables. */
1877
1878void
1879print_variable_data_base (void)
1880{
1881 puts (_("\n# Variables\n"));
1882
1883 print_variable_set (&global_variable_set, "");
1884
1885 puts (_("\n# Pattern-specific Variable Values"));
1886
1887 {
1888 struct pattern_var *p;
1889 int rules = 0;
1890
1891 for (p = pattern_vars; p != 0; p = p->next)
1892 {
1893 ++rules;
1894 printf ("\n%s :\n", p->target);
1895 print_variable (&p->variable, "# ");
1896 }
1897
1898 if (rules == 0)
1899 puts (_("\n# No pattern-specific variable values."));
1900 else
1901 printf (_("\n# %u pattern-specific variable values"), rules);
1902 }
1903}
1904
1905
1906/* Print all the local variables of FILE. */
1907
1908void
1909print_file_variables (struct file *file)
1910{
1911 if (file->variables != 0)
1912 print_variable_set (file->variables->set, "# ");
1913}
1914
1915#ifdef WINDOWS32
1916void
1917sync_Path_environment (void)
1918{
1919 char *path = allocated_variable_expand ("$(PATH)");
1920 static char *environ_path = NULL;
1921
1922 if (!path)
1923 return;
1924
1925 /*
1926 * If done this before, don't leak memory unnecessarily.
1927 * Free the previous entry before allocating new one.
1928 */
1929 if (environ_path)
1930 free (environ_path);
1931
1932 /*
1933 * Create something WINDOWS32 world can grok
1934 */
1935 convert_Path_to_windows32 (path, ';');
1936 environ_path = concat ("PATH", "=", path);
1937 putenv (environ_path);
1938 free (path);
1939}
1940#endif
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