source: trunk/src/gmake/variable.c@ 721

Last change on this file since 721 was 721, checked in by bird, 19 years ago

added 'stack' to the KMK_FEATURES variable.
  • Property svn:eol-style set to native
File size: 58.2 KB
Line 
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# ifdef PATH_KBUILD
1022 /* define the installed. */
1023 envvar = getenv("PATH_KBUILD");
1024 if (!envvar)
1025 {
1026 (void) define_variable ("PATH_KBUILD", sizeof("PATH_KBUILD") - 1,
1027 PATH_KBUILD, o_default, 0);
1028 envvar = getenv("PATH_KBUILD_BIN");
1029 if (!envvar)
1030 (void) define_variable ("PATH_KBUILD_BIN", sizeof("PATH_KBUILD_BIN") - 1,
1031 PATH_KBUILD_BIN, o_default, 0);
1032 }
1033# endif
1034
1035
1036 /* Define KMK_FEATURES to indicate various working KMK features. */
1037# if defined(CONFIG_WITH_TOUPPER_TOLOWER) \
1038 && defined(CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE) \
1039 && defined(CONFIG_WITH_STACK) \
1040 && defined(KMK_HELPERS)
1041 (void) define_variable ("KMK_FEATURES", 12,
1042 "abspath"
1043 " toupper tolower"
1044 " comp-vars"
1045 " stack "
1046 " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one"
1047 , o_default, 0);
1048# else /* MSC can't deal with strings mixed with #if/#endif, thus the slow way. */
1049 strcpy(buf, "abspath");
1050# if defined(CONFIG_WITH_TOUPPER_TOLOWER)
1051 strcat(buf, " toupper tolower");
1052# endif
1053# if defined(CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE)
1054 strcat(buf, " comp-vars");
1055# endif
1056# if defined(CONFIG_WITH_STACK)
1057 strcat(buf, " stack");
1058# endif
1059# ifdef KMK_HELPERS
1060 strcat(buf, " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one");
1061# endif
1062 (void) define_variable ("KMK_FEATURES", 12, buf, o_default, 0);
1063# endif
1064
1065#endif /* KMK */
1066
1067#ifdef CONFIG_WITH_KMK_BUILTIN
1068 /* The supported kMk Builtin commands. */
1069 (void) define_variable ("KMK_BUILTIN", 11, "append cp cat echo install ln mkdir rm rmdir", o_default, 0);
1070#endif
1071
1072#ifdef __MSDOS__
1073 /* Allow to specify a special shell just for Make,
1074 and use $COMSPEC as the default $SHELL when appropriate. */
1075 {
1076 static char shell_str[] = "SHELL";
1077 const int shlen = sizeof (shell_str) - 1;
1078 struct variable *mshp = lookup_variable ("MAKESHELL", 9);
1079 struct variable *comp = lookup_variable ("COMSPEC", 7);
1080
1081 /* Make $MAKESHELL override $SHELL even if -e is in effect. */
1082 if (mshp)
1083 (void) define_variable (shell_str, shlen,
1084 mshp->value, o_env_override, 0);
1085 else if (comp)
1086 {
1087 /* $COMSPEC shouldn't override $SHELL. */
1088 struct variable *shp = lookup_variable (shell_str, shlen);
1089
1090 if (!shp)
1091 (void) define_variable (shell_str, shlen, comp->value, o_env, 0);
1092 }
1093 }
1094#elif defined(__EMX__)
1095 {
1096 static char shell_str[] = "SHELL";
1097 const int shlen = sizeof (shell_str) - 1;
1098 struct variable *shell = lookup_variable (shell_str, shlen);
1099 struct variable *replace = lookup_variable ("MAKESHELL", 9);
1100
1101 /* if $MAKESHELL is defined in the environment assume o_env_override */
1102 if (replace && *replace->value && replace->origin == o_env)
1103 replace->origin = o_env_override;
1104
1105 /* if $MAKESHELL is not defined use $SHELL but only if the variable
1106 did not come from the environment */
1107 if (!replace || !*replace->value)
1108 if (shell && *shell->value && (shell->origin == o_env
1109 || shell->origin == o_env_override))
1110 {
1111 /* overwrite whatever we got from the environment */
1112 free(shell->value);
1113 shell->value = xstrdup (default_shell);
1114 shell->origin = o_default;
1115 }
1116
1117 /* Some people do not like cmd to be used as the default
1118 if $SHELL is not defined in the Makefile.
1119 With -DNO_CMD_DEFAULT you can turn off this behaviour */
1120# ifndef NO_CMD_DEFAULT
1121 /* otherwise use $COMSPEC */
1122 if (!replace || !*replace->value)
1123 replace = lookup_variable ("COMSPEC", 7);
1124
1125 /* otherwise use $OS2_SHELL */
1126 if (!replace || !*replace->value)
1127 replace = lookup_variable ("OS2_SHELL", 9);
1128# else
1129# warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell
1130# endif
1131
1132 if (replace && *replace->value)
1133 /* overwrite $SHELL */
1134 (void) define_variable (shell_str, shlen, replace->value,
1135 replace->origin, 0);
1136 else
1137 /* provide a definition if there is none */
1138 (void) define_variable (shell_str, shlen, default_shell,
1139 o_default, 0);
1140 }
1141
1142#endif
1143
1144 /* This won't override any definition, but it will provide one if there
1145 isn't one there. */
1146 v = define_variable ("SHELL", 5, default_shell, o_default, 0);
1147
1148 /* On MSDOS we do use SHELL from environment, since it isn't a standard
1149 environment variable on MSDOS, so whoever sets it, does that on purpose.
1150 On OS/2 we do not use SHELL from environment but we have already handled
1151 that problem above. */
1152#if !defined(__MSDOS__) && !defined(__EMX__)
1153 /* Don't let SHELL come from the environment. */
1154 if (*v->value == '\0' || v->origin == o_env || v->origin == o_env_override)
1155 {
1156 free (v->value);
1157 v->origin = o_file;
1158 v->value = xstrdup (default_shell);
1159#ifdef CONFIG_WITH_VALUE_LENGTH
1160 v->value_length = strlen (v->value);
1161 v->value_alloc_len = v->value_length + 1;
1162#endif
1163 }
1164#endif
1165
1166 /* Make sure MAKEFILES gets exported if it is set. */
1167 v = define_variable ("MAKEFILES", 9, "", o_default, 0);
1168 v->export = v_ifset;
1169
1170 /* Define the magic D and F variables in terms of
1171 the automatic variables they are variations of. */
1172
1173#ifdef VMS
1174 define_variable ("@D", 2, "$(dir $@)", o_automatic, 1);
1175 define_variable ("%D", 2, "$(dir $%)", o_automatic, 1);
1176 define_variable ("*D", 2, "$(dir $*)", o_automatic, 1);
1177 define_variable ("<D", 2, "$(dir $<)", o_automatic, 1);
1178 define_variable ("?D", 2, "$(dir $?)", o_automatic, 1);
1179 define_variable ("^D", 2, "$(dir $^)", o_automatic, 1);
1180 define_variable ("+D", 2, "$(dir $+)", o_automatic, 1);
1181#else
1182 define_variable ("@D", 2, "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
1183 define_variable ("%D", 2, "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
1184 define_variable ("*D", 2, "$(patsubst %/,%,$(dir $*))", o_automatic, 1);
1185 define_variable ("<D", 2, "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
1186 define_variable ("?D", 2, "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
1187 define_variable ("^D", 2, "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
1188 define_variable ("+D", 2, "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
1189#endif
1190 define_variable ("@F", 2, "$(notdir $@)", o_automatic, 1);
1191 define_variable ("%F", 2, "$(notdir $%)", o_automatic, 1);
1192 define_variable ("*F", 2, "$(notdir $*)", o_automatic, 1);
1193 define_variable ("<F", 2, "$(notdir $<)", o_automatic, 1);
1194 define_variable ("?F", 2, "$(notdir $?)", o_automatic, 1);
1195 define_variable ("^F", 2, "$(notdir $^)", o_automatic, 1);
1196 define_variable ("+F", 2, "$(notdir $+)", o_automatic, 1);
1197}
1198
1199
1200int export_all_variables;
1201
1202/* Create a new environment for FILE's commands.
1203 If FILE is nil, this is for the `shell' function.
1204 The child's MAKELEVEL variable is incremented. */
1205
1206char **
1207target_environment (struct file *file)
1208{
1209 struct variable_set_list *set_list;
1210 register struct variable_set_list *s;
1211 struct hash_table table;
1212 struct variable **v_slot;
1213 struct variable **v_end;
1214 struct variable makelevel_key;
1215 char **result_0;
1216 char **result;
1217
1218 if (file == 0)
1219 set_list = current_variable_set_list;
1220 else
1221 set_list = file->variables;
1222
1223 hash_init (&table, VARIABLE_BUCKETS,
1224 variable_hash_1, variable_hash_2, variable_hash_cmp);
1225
1226 /* Run through all the variable sets in the list,
1227 accumulating variables in TABLE. */
1228 for (s = set_list; s != 0; s = s->next)
1229 {
1230 struct variable_set *set = s->set;
1231 v_slot = (struct variable **) set->table.ht_vec;
1232 v_end = v_slot + set->table.ht_size;
1233 for ( ; v_slot < v_end; v_slot++)
1234 if (! HASH_VACANT (*v_slot))
1235 {
1236 struct variable **new_slot;
1237 struct variable *v = *v_slot;
1238
1239 /* If this is a per-target variable and it hasn't been touched
1240 already then look up the global version and take its export
1241 value. */
1242 if (v->per_target && v->export == v_default)
1243 {
1244 struct variable *gv;
1245
1246 gv = lookup_variable_in_set (v->name, strlen(v->name),
1247 &global_variable_set);
1248 if (gv)
1249 v->export = gv->export;
1250 }
1251
1252 switch (v->export)
1253 {
1254 case v_default:
1255 if (v->origin == o_default || v->origin == o_automatic)
1256 /* Only export default variables by explicit request. */
1257 continue;
1258
1259 /* The variable doesn't have a name that can be exported. */
1260 if (! v->exportable)
1261 continue;
1262
1263 if (! export_all_variables
1264 && v->origin != o_command
1265 && v->origin != o_env && v->origin != o_env_override)
1266 continue;
1267 break;
1268
1269 case v_export:
1270 break;
1271
1272 case v_noexport:
1273 /* If this is the SHELL variable and it's not exported, then
1274 add the value from our original environment. */
1275 if (streq (v->name, "SHELL"))
1276 {
1277 extern struct variable shell_var;
1278 v = &shell_var;
1279 break;
1280 }
1281 continue;
1282
1283 case v_ifset:
1284 if (v->origin == o_default)
1285 continue;
1286 break;
1287 }
1288
1289 new_slot = (struct variable **) hash_find_slot (&table, v);
1290 if (HASH_VACANT (*new_slot))
1291 hash_insert_at (&table, v, new_slot);
1292 }
1293 }
1294
1295 makelevel_key.name = MAKELEVEL_NAME;
1296 makelevel_key.length = MAKELEVEL_LENGTH;
1297#ifdef VARIABLE_HASH /* bird */
1298 makelevel_key.hash1 = variable_hash_1i (MAKELEVEL_NAME, MAKELEVEL_LENGTH);
1299 makelevel_key.hash2 = 0;
1300#endif
1301 hash_delete (&table, &makelevel_key);
1302
1303 result = result_0 = (char **) xmalloc ((table.ht_fill + 2) * sizeof (char *));
1304
1305 v_slot = (struct variable **) table.ht_vec;
1306 v_end = v_slot + table.ht_size;
1307 for ( ; v_slot < v_end; v_slot++)
1308 if (! HASH_VACANT (*v_slot))
1309 {
1310 struct variable *v = *v_slot;
1311
1312 /* If V is recursively expanded and didn't come from the environment,
1313 expand its value. If it came from the environment, it should
1314 go back into the environment unchanged. */
1315 if (v->recursive
1316 && v->origin != o_env && v->origin != o_env_override)
1317 {
1318 char *value = recursively_expand_for_file (v, file);
1319#ifdef WINDOWS32
1320 if (strcmp(v->name, "Path") == 0 ||
1321 strcmp(v->name, "PATH") == 0)
1322 convert_Path_to_windows32(value, ';');
1323#endif
1324 *result++ = concat (v->name, "=", value);
1325 free (value);
1326 }
1327 else
1328 {
1329#ifdef WINDOWS32
1330 if (strcmp(v->name, "Path") == 0 ||
1331 strcmp(v->name, "PATH") == 0)
1332 convert_Path_to_windows32(v->value, ';');
1333#endif
1334 *result++ = concat (v->name, "=", v->value);
1335 }
1336 }
1337
1338 *result = (char *) xmalloc (100);
1339 (void) sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1);
1340 *++result = 0;
1341
1342 hash_free (&table, 0);
1343
1344 return result_0;
1345}
1346
1347
1348#ifdef CONFIG_WITH_VALUE_LENGTH
1349static struct variable *
1350do_variable_definition_append (const struct floc *flocp, struct variable *v, char *value,
1351 enum variable_origin origin)
1352{
1353 if (env_overrides && origin == o_env)
1354 origin = o_env_override;
1355
1356 if (env_overrides && v->origin == o_env)
1357 /* V came from in the environment. Since it was defined
1358 before the switches were parsed, it wasn't affected by -e. */
1359 v->origin = o_env_override;
1360
1361 /* A variable of this name is already defined.
1362 If the old definition is from a stronger source
1363 than this one, don't redefine it. */
1364 if ((int) origin < (int) v->origin)
1365 return v;
1366 v->origin = origin;
1367
1368 /* location */
1369 if (flocp != 0)
1370 v->fileinfo = *flocp;
1371
1372 /* The juicy bits, append the specified value to the variable
1373 This is a heavily exercied code path in kBuild. */
1374 if (v->recursive)
1375 {
1376 /* The previous definition of the variable was recursive.
1377 The new value is the unexpanded old and new values. */
1378 unsigned int value_len = strlen (value);
1379 unsigned int new_value_len = value_len + (v->value_length != 0 ? 1 + v->value_length : 0);
1380
1381 /* adjust the size. */
1382 if ((unsigned)v->value_alloc_len <= new_value_len)
1383 {
1384 v->value_alloc_len = (new_value_len + 0x80) + 0x7f;
1385 v->value = xrealloc (v->value, v->value_alloc_len);
1386 }
1387
1388 /* insert the new bits */
1389 if (v->value_length != 0)
1390 {
1391 v->value[v->value_length] = ' ';
1392 memcpy (&v->value[v->value_length + 1], value, value_len + 1);
1393 }
1394 else
1395 memcpy (v->value, value, value_len + 1);
1396 v->value_length = new_value_len;
1397 }
1398 else
1399 {
1400 /* The previous definition of the variable was simple.
1401 The new value comes from the old value, which was expanded
1402 when it was set; and from the expanded new value. */
1403 append_expanded_string_to_variable(v, value);
1404 }
1405
1406 /* update the variable */
1407 return v;
1408}
1409#endif /* CONFIG_WITH_VALUE_LENGTH */
1410
1411
1412/* Given a variable, a value, and a flavor, define the variable.
1413 See the try_variable_definition() function for details on the parameters. */
1414
1415struct variable *
1416do_variable_definition (const struct floc *flocp, const char *varname,
1417 char *value, enum variable_origin origin,
1418 enum variable_flavor flavor, int target_var)
1419{
1420 char *p, *alloc_value = NULL;
1421 struct variable *v;
1422 int append = 0;
1423 int conditional = 0;
1424 const size_t varname_len = strlen (varname); /* bird */
1425# ifdef CONFIG_WITH_VALUE_LENGTH
1426 unsigned int value_len = ~0U;
1427# endif
1428
1429 /* Calculate the variable's new value in VALUE. */
1430
1431 switch (flavor)
1432 {
1433 default:
1434 case f_bogus:
1435 /* Should not be possible. */
1436 abort ();
1437 case f_simple:
1438 /* A simple variable definition "var := value". Expand the value.
1439 We have to allocate memory since otherwise it'll clobber the
1440 variable buffer, and we may still need that if we're looking at a
1441 target-specific variable. */
1442 p = alloc_value = allocated_variable_expand (value);
1443 break;
1444 case f_conditional:
1445 /* A conditional variable definition "var ?= value".
1446 The value is set IFF the variable is not defined yet. */
1447 v = lookup_variable (varname, varname_len);
1448 if (v)
1449 return v;
1450
1451 conditional = 1;
1452 flavor = f_recursive;
1453 /* FALLTHROUGH */
1454 case f_recursive:
1455 /* A recursive variable definition "var = value".
1456 The value is used verbatim. */
1457 p = value;
1458 break;
1459 case f_append:
1460 {
1461 /* If we have += but we're in a target variable context, we want to
1462 append only with other variables in the context of this target. */
1463 if (target_var)
1464 {
1465 append = 1;
1466 v = lookup_variable_in_set (varname, varname_len,
1467 current_variable_set_list->set);
1468
1469 /* Don't append from the global set if a previous non-appending
1470 target-specific variable definition exists. */
1471 if (v && !v->append)
1472 append = 0;
1473 }
1474 else
1475 v = lookup_variable (varname, varname_len);
1476
1477 if (v == 0)
1478 {
1479 /* There was no old value.
1480 This becomes a normal recursive definition. */
1481 p = value;
1482 flavor = f_recursive;
1483 }
1484 else
1485 {
1486#ifdef CONFIG_WITH_VALUE_LENGTH
1487 v->append = append;
1488 return do_variable_definition_append (flocp, v, value, origin);
1489#else /* !CONFIG_WITH_VALUE_LENGTH */
1490
1491 /* Paste the old and new values together in VALUE. */
1492
1493 unsigned int oldlen, vallen;
1494 char *val;
1495
1496 val = value;
1497 if (v->recursive)
1498 /* The previous definition of the variable was recursive.
1499 The new value is the unexpanded old and new values. */
1500 flavor = f_recursive;
1501 else
1502 /* The previous definition of the variable was simple.
1503 The new value comes from the old value, which was expanded
1504 when it was set; and from the expanded new value. Allocate
1505 memory for the expansion as we may still need the rest of the
1506 buffer if we're looking at a target-specific variable. */
1507 val = alloc_value = allocated_variable_expand (val);
1508
1509 oldlen = strlen (v->value);
1510 vallen = strlen (val);
1511 p = (char *) alloca (oldlen + 1 + vallen + 1);
1512 bcopy (v->value, p, oldlen);
1513 p[oldlen] = ' ';
1514 bcopy (val, &p[oldlen + 1], vallen + 1);
1515#endif /* !CONFIG_WITH_VALUE_LENGTH */
1516 }
1517 }
1518 }
1519
1520#ifdef __MSDOS__
1521 /* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1522 non-Unix systems don't conform to this default configuration (in
1523 fact, most of them don't even have `/bin'). On the other hand,
1524 $SHELL in the environment, if set, points to the real pathname of
1525 the shell.
1526 Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1527 the Makefile override $SHELL from the environment. But first, we
1528 look for the basename of the shell in the directory where SHELL=
1529 points, and along the $PATH; if it is found in any of these places,
1530 we define $SHELL to be the actual pathname of the shell. Thus, if
1531 you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1532 your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1533 defining SHELL to be "d:/unix/bash.exe". */
1534 if ((origin == o_file || origin == o_override)
1535 && strcmp (varname, "SHELL") == 0)
1536 {
1537 PATH_VAR (shellpath);
1538 extern char * __dosexec_find_on_path (const char *, char *[], char *);
1539
1540 /* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1541 if (__dosexec_find_on_path (p, (char **)0, shellpath))
1542 {
1543 char *p;
1544
1545 for (p = shellpath; *p; p++)
1546 {
1547 if (*p == '\\')
1548 *p = '/';
1549 }
1550 v = define_variable_loc (varname, varname_len,
1551 shellpath, origin, flavor == f_recursive,
1552 flocp);
1553 }
1554 else
1555 {
1556 char *shellbase, *bslash;
1557 struct variable *pathv = lookup_variable ("PATH", 4);
1558 char *path_string;
1559 char *fake_env[2];
1560 size_t pathlen = 0;
1561
1562 shellbase = strrchr (p, '/');
1563 bslash = strrchr (p, '\\');
1564 if (!shellbase || bslash > shellbase)
1565 shellbase = bslash;
1566 if (!shellbase && p[1] == ':')
1567 shellbase = p + 1;
1568 if (shellbase)
1569 shellbase++;
1570 else
1571 shellbase = p;
1572
1573 /* Search for the basename of the shell (with standard
1574 executable extensions) along the $PATH. */
1575 if (pathv)
1576 pathlen = strlen (pathv->value);
1577 path_string = (char *)xmalloc (5 + pathlen + 2 + 1);
1578 /* On MSDOS, current directory is considered as part of $PATH. */
1579 sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1580 fake_env[0] = path_string;
1581 fake_env[1] = (char *)0;
1582 if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1583 {
1584 char *p;
1585
1586 for (p = shellpath; *p; p++)
1587 {
1588 if (*p == '\\')
1589 *p = '/';
1590 }
1591 v = define_variable_loc (varname, varname_len,
1592 shellpath, origin,
1593 flavor == f_recursive, flocp);
1594 }
1595 else
1596 v = lookup_variable (varname, varname_len);
1597
1598 free (path_string);
1599 }
1600 }
1601 else
1602#endif /* __MSDOS__ */
1603#ifdef WINDOWS32
1604 if ( varname_len == sizeof("SHELL") - 1 /* bird */
1605 && (origin == o_file || origin == o_override || origin == o_command)
1606 && streq (varname, "SHELL"))
1607 {
1608 extern char *default_shell;
1609
1610 /* Call shell locator function. If it returns TRUE, then
1611 set no_default_sh_exe to indicate sh was found and
1612 set new value for SHELL variable. */
1613
1614 if (find_and_set_default_shell (p))
1615 {
1616 v = define_variable_in_set (varname, varname_len, default_shell,
1617# ifdef CONFIG_WITH_VALUE_LENGTH
1618 ~0U, 1 /* duplicate_value */,
1619# endif
1620 origin, flavor == f_recursive,
1621 (target_var
1622 ? current_variable_set_list->set
1623 : NULL),
1624 flocp);
1625 no_default_sh_exe = 0;
1626 }
1627 else
1628 v = lookup_variable (varname, varname_len);
1629# ifdef CONFIG_WITH_VALUE_LENGTH
1630 if (alloc_value)
1631 free (alloc_value);
1632# endif
1633 }
1634 else
1635#endif
1636
1637 /* If we are defining variables inside an $(eval ...), we might have a
1638 different variable context pushed, not the global context (maybe we're
1639 inside a $(call ...) or something. Since this function is only ever
1640 invoked in places where we want to define globally visible variables,
1641 make sure we define this variable in the global set. */
1642
1643 v = define_variable_in_set (varname, varname_len, p,
1644#ifdef CONFIG_WITH_VALUE_LENGTH
1645 value_len, !alloc_value,
1646#endif
1647 origin, flavor == f_recursive,
1648 (target_var
1649 ? current_variable_set_list->set : NULL),
1650 flocp);
1651 v->append = append;
1652 v->conditional = conditional;
1653
1654#ifndef CONFIG_WITH_VALUE_LENGTH
1655 if (alloc_value)
1656 free (alloc_value);
1657#endif
1658
1659 return v;
1660}
1661
1662
1663/* Try to interpret LINE (a null-terminated string) as a variable definition.
1664
1665 ORIGIN may be o_file, o_override, o_env, o_env_override,
1666 or o_command specifying that the variable definition comes
1667 from a makefile, an override directive, the environment with
1668 or without the -e switch, or the command line.
1669
1670 See the comments for parse_variable_definition().
1671
1672 If LINE was recognized as a variable definition, a pointer to its `struct
1673 variable' is returned. If LINE is not a variable definition, NULL is
1674 returned. */
1675
1676struct variable *
1677parse_variable_definition (struct variable *v, char *line)
1678{
1679 register int c;
1680 register char *p = line;
1681 register char *beg;
1682 register char *end;
1683 enum variable_flavor flavor = f_bogus;
1684 char *name;
1685
1686 while (1)
1687 {
1688 c = *p++;
1689 if (c == '\0' || c == '#')
1690 return 0;
1691 if (c == '=')
1692 {
1693 end = p - 1;
1694 flavor = f_recursive;
1695 break;
1696 }
1697 else if (c == ':')
1698 if (*p == '=')
1699 {
1700 end = p++ - 1;
1701 flavor = f_simple;
1702 break;
1703 }
1704 else
1705 /* A colon other than := is a rule line, not a variable defn. */
1706 return 0;
1707 else if (c == '+' && *p == '=')
1708 {
1709 end = p++ - 1;
1710 flavor = f_append;
1711 break;
1712 }
1713 else if (c == '?' && *p == '=')
1714 {
1715 end = p++ - 1;
1716 flavor = f_conditional;
1717 break;
1718 }
1719 else if (c == '$')
1720 {
1721 /* This might begin a variable expansion reference. Make sure we
1722 don't misrecognize chars inside the reference as =, := or +=. */
1723 char closeparen;
1724 int count;
1725 c = *p++;
1726 if (c == '(')
1727 closeparen = ')';
1728 else if (c == '{')
1729 closeparen = '}';
1730 else
1731 continue; /* Nope. */
1732
1733 /* P now points past the opening paren or brace.
1734 Count parens or braces until it is matched. */
1735 count = 0;
1736 for (; *p != '\0'; ++p)
1737 {
1738 if (*p == c)
1739 ++count;
1740 else if (*p == closeparen && --count < 0)
1741 {
1742 ++p;
1743 break;
1744 }
1745 }
1746 }
1747 }
1748 v->flavor = flavor;
1749
1750 beg = next_token (line);
1751 while (end > beg && isblank ((unsigned char)end[-1]))
1752 --end;
1753 p = next_token (p);
1754 v->value = p;
1755#ifdef CONFIG_WITH_VALUE_LENGTH
1756 v->value_length = v->value_alloc_len = -1;
1757#endif
1758
1759 /* Expand the name, so "$(foo)bar = baz" works. */
1760 name = (char *) alloca (end - beg + 1);
1761 bcopy (beg, name, end - beg);
1762 name[end - beg] = '\0';
1763 v->name = allocated_variable_expand (name);
1764
1765 if (v->name[0] == '\0')
1766 fatal (&v->fileinfo, _("empty variable name"));
1767
1768 return v;
1769}
1770
1771
1772/* Try to interpret LINE (a null-terminated string) as a variable definition.
1773
1774 ORIGIN may be o_file, o_override, o_env, o_env_override,
1775 or o_command specifying that the variable definition comes
1776 from a makefile, an override directive, the environment with
1777 or without the -e switch, or the command line.
1778
1779 See the comments for parse_variable_definition().
1780
1781 If LINE was recognized as a variable definition, a pointer to its `struct
1782 variable' is returned. If LINE is not a variable definition, NULL is
1783 returned. */
1784
1785struct variable *
1786try_variable_definition (const struct floc *flocp, char *line,
1787 enum variable_origin origin, int target_var)
1788{
1789 struct variable v;
1790 struct variable *vp;
1791
1792 if (flocp != 0)
1793 v.fileinfo = *flocp;
1794 else
1795 v.fileinfo.filenm = 0;
1796
1797 if (!parse_variable_definition (&v, line))
1798 return 0;
1799
1800 vp = do_variable_definition (flocp, v.name, v.value,
1801 origin, v.flavor, target_var);
1802
1803 free (v.name);
1804
1805 return vp;
1806}
1807
1808
1809/* Print information for variable V, prefixing it with PREFIX. */
1810
1811static void
1812print_variable (const void *item, void *arg)
1813{
1814 const struct variable *v = (struct variable *) item;
1815 const char *prefix = (char *) arg;
1816 const char *origin;
1817
1818 switch (v->origin)
1819 {
1820 case o_default:
1821 origin = _("default");
1822 break;
1823 case o_env:
1824 origin = _("environment");
1825 break;
1826 case o_file:
1827 origin = _("makefile");
1828 break;
1829 case o_env_override:
1830 origin = _("environment under -e");
1831 break;
1832 case o_command:
1833 origin = _("command line");
1834 break;
1835 case o_override:
1836 origin = _("`override' directive");
1837 break;
1838 case o_automatic:
1839 origin = _("automatic");
1840 break;
1841 case o_invalid:
1842 default:
1843 abort ();
1844 }
1845 fputs ("# ", stdout);
1846 fputs (origin, stdout);
1847 if (v->fileinfo.filenm)
1848 printf (_(" (from `%s', line %lu)"),
1849 v->fileinfo.filenm, v->fileinfo.lineno);
1850 putchar ('\n');
1851 fputs (prefix, stdout);
1852
1853 /* Is this a `define'? */
1854 if (v->recursive && strchr (v->value, '\n') != 0)
1855 printf ("define %s\n%s\nendef\n", v->name, v->value);
1856 else
1857 {
1858 register char *p;
1859
1860 printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1861
1862 /* Check if the value is just whitespace. */
1863 p = next_token (v->value);
1864 if (p != v->value && *p == '\0')
1865 /* All whitespace. */
1866 printf ("$(subst ,,%s)", v->value);
1867 else if (v->recursive)
1868 fputs (v->value, stdout);
1869 else
1870 /* Double up dollar signs. */
1871 for (p = v->value; *p != '\0'; ++p)
1872 {
1873 if (*p == '$')
1874 putchar ('$');
1875 putchar (*p);
1876 }
1877 putchar ('\n');
1878 }
1879}
1880
1881
1882/* Print all the variables in SET. PREFIX is printed before
1883 the actual variable definitions (everything else is comments). */
1884
1885void
1886print_variable_set (struct variable_set *set, char *prefix)
1887{
1888 hash_map_arg (&set->table, print_variable, prefix);
1889
1890 fputs (_("# variable set hash-table stats:\n"), stdout);
1891 fputs ("# ", stdout);
1892 hash_print_stats (&set->table, stdout);
1893 putc ('\n', stdout);
1894}
1895
1896/* Print the data base of variables. */
1897
1898void
1899print_variable_data_base (void)
1900{
1901 puts (_("\n# Variables\n"));
1902
1903 print_variable_set (&global_variable_set, "");
1904
1905 puts (_("\n# Pattern-specific Variable Values"));
1906
1907 {
1908 struct pattern_var *p;
1909 int rules = 0;
1910
1911 for (p = pattern_vars; p != 0; p = p->next)
1912 {
1913 ++rules;
1914 printf ("\n%s :\n", p->target);
1915 print_variable (&p->variable, "# ");
1916 }
1917
1918 if (rules == 0)
1919 puts (_("\n# No pattern-specific variable values."));
1920 else
1921 printf (_("\n# %u pattern-specific variable values"), rules);
1922 }
1923}
1924
1925
1926/* Print all the local variables of FILE. */
1927
1928void
1929print_file_variables (struct file *file)
1930{
1931 if (file->variables != 0)
1932 print_variable_set (file->variables->set, "# ");
1933}
1934
1935#ifdef WINDOWS32
1936void
1937sync_Path_environment (void)
1938{
1939 char *path = allocated_variable_expand ("$(PATH)");
1940 static char *environ_path = NULL;
1941
1942 if (!path)
1943 return;
1944
1945 /*
1946 * If done this before, don't leak memory unnecessarily.
1947 * Free the previous entry before allocating new one.
1948 */
1949 if (environ_path)
1950 free (environ_path);
1951
1952 /*
1953 * Create something WINDOWS32 world can grok
1954 */
1955 convert_Path_to_windows32 (path, ';');
1956 environ_path = concat ("PATH", "=", path);
1957 putenv (environ_path);
1958 free (path);
1959}
1960#endif
Note: See TracBrowser for help on using the repository browser.