source: trunk/src/gmake/variable.c@ 657

Last change on this file since 657 was 611, checked in by bird, 19 years ago

Added cat as builtin command.
  • Property svn:eol-style set to native
File size: 58.1 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(KMK_HELPERS)
1040 (void) define_variable ("KMK_FEATURES", 12,
1041 "abspath"
1042 " toupper tolower"
1043 " comp-vars"
1044 " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one"
1045 , o_default, 0);
1046# else /* MSC can't deal with strings mixed with #if/#endif, thus the slow way. */
1047 strcpy(buf, "abspath");
1048# if defined(CONFIG_WITH_TOUPPER_TOLOWER)
1049 strcat(buf, " toupper tolower");
1050# endif
1051# if defined(CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE)
1052 strcat(buf, " comp-vars");
1053# endif
1054# ifdef KMK_HELPERS
1055 strcat(buf, " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one");
1056# endif
1057 (void) define_variable ("KMK_FEATURES", 12, buf, o_default, 0);
1058# endif
1059
1060#endif /* KMK */
1061
1062#ifdef CONFIG_WITH_KMK_BUILTIN
1063 /* The supported kMk Builtin commands. */
1064 (void) define_variable ("KMK_BUILTIN", 11, "append cp cat echo install ln mkdir rm rmdir", o_default, 0);
1065#endif
1066
1067#ifdef __MSDOS__
1068 /* Allow to specify a special shell just for Make,
1069 and use $COMSPEC as the default $SHELL when appropriate. */
1070 {
1071 static char shell_str[] = "SHELL";
1072 const int shlen = sizeof (shell_str) - 1;
1073 struct variable *mshp = lookup_variable ("MAKESHELL", 9);
1074 struct variable *comp = lookup_variable ("COMSPEC", 7);
1075
1076 /* Make $MAKESHELL override $SHELL even if -e is in effect. */
1077 if (mshp)
1078 (void) define_variable (shell_str, shlen,
1079 mshp->value, o_env_override, 0);
1080 else if (comp)
1081 {
1082 /* $COMSPEC shouldn't override $SHELL. */
1083 struct variable *shp = lookup_variable (shell_str, shlen);
1084
1085 if (!shp)
1086 (void) define_variable (shell_str, shlen, comp->value, o_env, 0);
1087 }
1088 }
1089#elif defined(__EMX__)
1090 {
1091 static char shell_str[] = "SHELL";
1092 const int shlen = sizeof (shell_str) - 1;
1093 struct variable *shell = lookup_variable (shell_str, shlen);
1094 struct variable *replace = lookup_variable ("MAKESHELL", 9);
1095
1096 /* if $MAKESHELL is defined in the environment assume o_env_override */
1097 if (replace && *replace->value && replace->origin == o_env)
1098 replace->origin = o_env_override;
1099
1100 /* if $MAKESHELL is not defined use $SHELL but only if the variable
1101 did not come from the environment */
1102 if (!replace || !*replace->value)
1103 if (shell && *shell->value && (shell->origin == o_env
1104 || shell->origin == o_env_override))
1105 {
1106 /* overwrite whatever we got from the environment */
1107 free(shell->value);
1108 shell->value = xstrdup (default_shell);
1109 shell->origin = o_default;
1110 }
1111
1112 /* Some people do not like cmd to be used as the default
1113 if $SHELL is not defined in the Makefile.
1114 With -DNO_CMD_DEFAULT you can turn off this behaviour */
1115# ifndef NO_CMD_DEFAULT
1116 /* otherwise use $COMSPEC */
1117 if (!replace || !*replace->value)
1118 replace = lookup_variable ("COMSPEC", 7);
1119
1120 /* otherwise use $OS2_SHELL */
1121 if (!replace || !*replace->value)
1122 replace = lookup_variable ("OS2_SHELL", 9);
1123# else
1124# warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell
1125# endif
1126
1127 if (replace && *replace->value)
1128 /* overwrite $SHELL */
1129 (void) define_variable (shell_str, shlen, replace->value,
1130 replace->origin, 0);
1131 else
1132 /* provide a definition if there is none */
1133 (void) define_variable (shell_str, shlen, default_shell,
1134 o_default, 0);
1135 }
1136
1137#endif
1138
1139 /* This won't override any definition, but it will provide one if there
1140 isn't one there. */
1141 v = define_variable ("SHELL", 5, default_shell, o_default, 0);
1142
1143 /* On MSDOS we do use SHELL from environment, since it isn't a standard
1144 environment variable on MSDOS, so whoever sets it, does that on purpose.
1145 On OS/2 we do not use SHELL from environment but we have already handled
1146 that problem above. */
1147#if !defined(__MSDOS__) && !defined(__EMX__)
1148 /* Don't let SHELL come from the environment. */
1149 if (*v->value == '\0' || v->origin == o_env || v->origin == o_env_override)
1150 {
1151 free (v->value);
1152 v->origin = o_file;
1153 v->value = xstrdup (default_shell);
1154#ifdef CONFIG_WITH_VALUE_LENGTH
1155 v->value_length = strlen (v->value);
1156 v->value_alloc_len = v->value_length + 1;
1157#endif
1158 }
1159#endif
1160
1161 /* Make sure MAKEFILES gets exported if it is set. */
1162 v = define_variable ("MAKEFILES", 9, "", o_default, 0);
1163 v->export = v_ifset;
1164
1165 /* Define the magic D and F variables in terms of
1166 the automatic variables they are variations of. */
1167
1168#ifdef VMS
1169 define_variable ("@D", 2, "$(dir $@)", o_automatic, 1);
1170 define_variable ("%D", 2, "$(dir $%)", o_automatic, 1);
1171 define_variable ("*D", 2, "$(dir $*)", o_automatic, 1);
1172 define_variable ("<D", 2, "$(dir $<)", o_automatic, 1);
1173 define_variable ("?D", 2, "$(dir $?)", o_automatic, 1);
1174 define_variable ("^D", 2, "$(dir $^)", o_automatic, 1);
1175 define_variable ("+D", 2, "$(dir $+)", o_automatic, 1);
1176#else
1177 define_variable ("@D", 2, "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
1178 define_variable ("%D", 2, "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
1179 define_variable ("*D", 2, "$(patsubst %/,%,$(dir $*))", o_automatic, 1);
1180 define_variable ("<D", 2, "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
1181 define_variable ("?D", 2, "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
1182 define_variable ("^D", 2, "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
1183 define_variable ("+D", 2, "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
1184#endif
1185 define_variable ("@F", 2, "$(notdir $@)", o_automatic, 1);
1186 define_variable ("%F", 2, "$(notdir $%)", o_automatic, 1);
1187 define_variable ("*F", 2, "$(notdir $*)", o_automatic, 1);
1188 define_variable ("<F", 2, "$(notdir $<)", o_automatic, 1);
1189 define_variable ("?F", 2, "$(notdir $?)", o_automatic, 1);
1190 define_variable ("^F", 2, "$(notdir $^)", o_automatic, 1);
1191 define_variable ("+F", 2, "$(notdir $+)", o_automatic, 1);
1192}
1193
1194
1195int export_all_variables;
1196
1197/* Create a new environment for FILE's commands.
1198 If FILE is nil, this is for the `shell' function.
1199 The child's MAKELEVEL variable is incremented. */
1200
1201char **
1202target_environment (struct file *file)
1203{
1204 struct variable_set_list *set_list;
1205 register struct variable_set_list *s;
1206 struct hash_table table;
1207 struct variable **v_slot;
1208 struct variable **v_end;
1209 struct variable makelevel_key;
1210 char **result_0;
1211 char **result;
1212
1213 if (file == 0)
1214 set_list = current_variable_set_list;
1215 else
1216 set_list = file->variables;
1217
1218 hash_init (&table, VARIABLE_BUCKETS,
1219 variable_hash_1, variable_hash_2, variable_hash_cmp);
1220
1221 /* Run through all the variable sets in the list,
1222 accumulating variables in TABLE. */
1223 for (s = set_list; s != 0; s = s->next)
1224 {
1225 struct variable_set *set = s->set;
1226 v_slot = (struct variable **) set->table.ht_vec;
1227 v_end = v_slot + set->table.ht_size;
1228 for ( ; v_slot < v_end; v_slot++)
1229 if (! HASH_VACANT (*v_slot))
1230 {
1231 struct variable **new_slot;
1232 struct variable *v = *v_slot;
1233
1234 /* If this is a per-target variable and it hasn't been touched
1235 already then look up the global version and take its export
1236 value. */
1237 if (v->per_target && v->export == v_default)
1238 {
1239 struct variable *gv;
1240
1241 gv = lookup_variable_in_set (v->name, strlen(v->name),
1242 &global_variable_set);
1243 if (gv)
1244 v->export = gv->export;
1245 }
1246
1247 switch (v->export)
1248 {
1249 case v_default:
1250 if (v->origin == o_default || v->origin == o_automatic)
1251 /* Only export default variables by explicit request. */
1252 continue;
1253
1254 /* The variable doesn't have a name that can be exported. */
1255 if (! v->exportable)
1256 continue;
1257
1258 if (! export_all_variables
1259 && v->origin != o_command
1260 && v->origin != o_env && v->origin != o_env_override)
1261 continue;
1262 break;
1263
1264 case v_export:
1265 break;
1266
1267 case v_noexport:
1268 /* If this is the SHELL variable and it's not exported, then
1269 add the value from our original environment. */
1270 if (streq (v->name, "SHELL"))
1271 {
1272 extern struct variable shell_var;
1273 v = &shell_var;
1274 break;
1275 }
1276 continue;
1277
1278 case v_ifset:
1279 if (v->origin == o_default)
1280 continue;
1281 break;
1282 }
1283
1284 new_slot = (struct variable **) hash_find_slot (&table, v);
1285 if (HASH_VACANT (*new_slot))
1286 hash_insert_at (&table, v, new_slot);
1287 }
1288 }
1289
1290 makelevel_key.name = MAKELEVEL_NAME;
1291 makelevel_key.length = MAKELEVEL_LENGTH;
1292#ifdef VARIABLE_HASH /* bird */
1293 makelevel_key.hash1 = variable_hash_1i (MAKELEVEL_NAME, MAKELEVEL_LENGTH);
1294 makelevel_key.hash2 = 0;
1295#endif
1296 hash_delete (&table, &makelevel_key);
1297
1298 result = result_0 = (char **) xmalloc ((table.ht_fill + 2) * sizeof (char *));
1299
1300 v_slot = (struct variable **) table.ht_vec;
1301 v_end = v_slot + table.ht_size;
1302 for ( ; v_slot < v_end; v_slot++)
1303 if (! HASH_VACANT (*v_slot))
1304 {
1305 struct variable *v = *v_slot;
1306
1307 /* If V is recursively expanded and didn't come from the environment,
1308 expand its value. If it came from the environment, it should
1309 go back into the environment unchanged. */
1310 if (v->recursive
1311 && v->origin != o_env && v->origin != o_env_override)
1312 {
1313 char *value = recursively_expand_for_file (v, file);
1314#ifdef WINDOWS32
1315 if (strcmp(v->name, "Path") == 0 ||
1316 strcmp(v->name, "PATH") == 0)
1317 convert_Path_to_windows32(value, ';');
1318#endif
1319 *result++ = concat (v->name, "=", value);
1320 free (value);
1321 }
1322 else
1323 {
1324#ifdef WINDOWS32
1325 if (strcmp(v->name, "Path") == 0 ||
1326 strcmp(v->name, "PATH") == 0)
1327 convert_Path_to_windows32(v->value, ';');
1328#endif
1329 *result++ = concat (v->name, "=", v->value);
1330 }
1331 }
1332
1333 *result = (char *) xmalloc (100);
1334 (void) sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1);
1335 *++result = 0;
1336
1337 hash_free (&table, 0);
1338
1339 return result_0;
1340}
1341
1342
1343#ifdef CONFIG_WITH_VALUE_LENGTH
1344static struct variable *
1345do_variable_definition_append (const struct floc *flocp, struct variable *v, char *value,
1346 enum variable_origin origin)
1347{
1348 if (env_overrides && origin == o_env)
1349 origin = o_env_override;
1350
1351 if (env_overrides && v->origin == o_env)
1352 /* V came from in the environment. Since it was defined
1353 before the switches were parsed, it wasn't affected by -e. */
1354 v->origin = o_env_override;
1355
1356 /* A variable of this name is already defined.
1357 If the old definition is from a stronger source
1358 than this one, don't redefine it. */
1359 if ((int) origin < (int) v->origin)
1360 return v;
1361 v->origin = origin;
1362
1363 /* location */
1364 if (flocp != 0)
1365 v->fileinfo = *flocp;
1366
1367 /* The juicy bits, append the specified value to the variable
1368 This is a heavily exercied code path in kBuild. */
1369 if (v->recursive)
1370 {
1371 /* The previous definition of the variable was recursive.
1372 The new value is the unexpanded old and new values. */
1373 unsigned int value_len = strlen (value);
1374 unsigned int new_value_len = value_len + (v->value_length != 0 ? 1 + v->value_length : 0);
1375
1376 /* adjust the size. */
1377 if ((unsigned)v->value_alloc_len <= new_value_len)
1378 {
1379 v->value_alloc_len = (new_value_len + 0x80) + 0x7f;
1380 v->value = xrealloc (v->value, v->value_alloc_len);
1381 }
1382
1383 /* insert the new bits */
1384 if (v->value_length != 0)
1385 {
1386 v->value[v->value_length] = ' ';
1387 memcpy (&v->value[v->value_length + 1], value, value_len + 1);
1388 }
1389 else
1390 memcpy (v->value, value, value_len + 1);
1391 v->value_length = new_value_len;
1392 }
1393 else
1394 {
1395 /* The previous definition of the variable was simple.
1396 The new value comes from the old value, which was expanded
1397 when it was set; and from the expanded new value. */
1398 append_expanded_string_to_variable(v, value);
1399 }
1400
1401 /* update the variable */
1402 return v;
1403}
1404#endif /* CONFIG_WITH_VALUE_LENGTH */
1405
1406
1407/* Given a variable, a value, and a flavor, define the variable.
1408 See the try_variable_definition() function for details on the parameters. */
1409
1410struct variable *
1411do_variable_definition (const struct floc *flocp, const char *varname,
1412 char *value, enum variable_origin origin,
1413 enum variable_flavor flavor, int target_var)
1414{
1415 char *p, *alloc_value = NULL;
1416 struct variable *v;
1417 int append = 0;
1418 int conditional = 0;
1419 const size_t varname_len = strlen (varname); /* bird */
1420# ifdef CONFIG_WITH_VALUE_LENGTH
1421 unsigned int value_len = ~0U;
1422# endif
1423
1424 /* Calculate the variable's new value in VALUE. */
1425
1426 switch (flavor)
1427 {
1428 default:
1429 case f_bogus:
1430 /* Should not be possible. */
1431 abort ();
1432 case f_simple:
1433 /* A simple variable definition "var := value". Expand the value.
1434 We have to allocate memory since otherwise it'll clobber the
1435 variable buffer, and we may still need that if we're looking at a
1436 target-specific variable. */
1437 p = alloc_value = allocated_variable_expand (value);
1438 break;
1439 case f_conditional:
1440 /* A conditional variable definition "var ?= value".
1441 The value is set IFF the variable is not defined yet. */
1442 v = lookup_variable (varname, varname_len);
1443 if (v)
1444 return v;
1445
1446 conditional = 1;
1447 flavor = f_recursive;
1448 /* FALLTHROUGH */
1449 case f_recursive:
1450 /* A recursive variable definition "var = value".
1451 The value is used verbatim. */
1452 p = value;
1453 break;
1454 case f_append:
1455 {
1456 /* If we have += but we're in a target variable context, we want to
1457 append only with other variables in the context of this target. */
1458 if (target_var)
1459 {
1460 append = 1;
1461 v = lookup_variable_in_set (varname, varname_len,
1462 current_variable_set_list->set);
1463
1464 /* Don't append from the global set if a previous non-appending
1465 target-specific variable definition exists. */
1466 if (v && !v->append)
1467 append = 0;
1468 }
1469 else
1470 v = lookup_variable (varname, varname_len);
1471
1472 if (v == 0)
1473 {
1474 /* There was no old value.
1475 This becomes a normal recursive definition. */
1476 p = value;
1477 flavor = f_recursive;
1478 }
1479 else
1480 {
1481#ifdef CONFIG_WITH_VALUE_LENGTH
1482 v->append = append;
1483 return do_variable_definition_append (flocp, v, value, origin);
1484#else /* !CONFIG_WITH_VALUE_LENGTH */
1485
1486 /* Paste the old and new values together in VALUE. */
1487
1488 unsigned int oldlen, vallen;
1489 char *val;
1490
1491 val = value;
1492 if (v->recursive)
1493 /* The previous definition of the variable was recursive.
1494 The new value is the unexpanded old and new values. */
1495 flavor = f_recursive;
1496 else
1497 /* The previous definition of the variable was simple.
1498 The new value comes from the old value, which was expanded
1499 when it was set; and from the expanded new value. Allocate
1500 memory for the expansion as we may still need the rest of the
1501 buffer if we're looking at a target-specific variable. */
1502 val = alloc_value = allocated_variable_expand (val);
1503
1504 oldlen = strlen (v->value);
1505 vallen = strlen (val);
1506 p = (char *) alloca (oldlen + 1 + vallen + 1);
1507 bcopy (v->value, p, oldlen);
1508 p[oldlen] = ' ';
1509 bcopy (val, &p[oldlen + 1], vallen + 1);
1510#endif /* !CONFIG_WITH_VALUE_LENGTH */
1511 }
1512 }
1513 }
1514
1515#ifdef __MSDOS__
1516 /* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1517 non-Unix systems don't conform to this default configuration (in
1518 fact, most of them don't even have `/bin'). On the other hand,
1519 $SHELL in the environment, if set, points to the real pathname of
1520 the shell.
1521 Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1522 the Makefile override $SHELL from the environment. But first, we
1523 look for the basename of the shell in the directory where SHELL=
1524 points, and along the $PATH; if it is found in any of these places,
1525 we define $SHELL to be the actual pathname of the shell. Thus, if
1526 you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1527 your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1528 defining SHELL to be "d:/unix/bash.exe". */
1529 if ((origin == o_file || origin == o_override)
1530 && strcmp (varname, "SHELL") == 0)
1531 {
1532 PATH_VAR (shellpath);
1533 extern char * __dosexec_find_on_path (const char *, char *[], char *);
1534
1535 /* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1536 if (__dosexec_find_on_path (p, (char **)0, shellpath))
1537 {
1538 char *p;
1539
1540 for (p = shellpath; *p; p++)
1541 {
1542 if (*p == '\\')
1543 *p = '/';
1544 }
1545 v = define_variable_loc (varname, varname_len,
1546 shellpath, origin, flavor == f_recursive,
1547 flocp);
1548 }
1549 else
1550 {
1551 char *shellbase, *bslash;
1552 struct variable *pathv = lookup_variable ("PATH", 4);
1553 char *path_string;
1554 char *fake_env[2];
1555 size_t pathlen = 0;
1556
1557 shellbase = strrchr (p, '/');
1558 bslash = strrchr (p, '\\');
1559 if (!shellbase || bslash > shellbase)
1560 shellbase = bslash;
1561 if (!shellbase && p[1] == ':')
1562 shellbase = p + 1;
1563 if (shellbase)
1564 shellbase++;
1565 else
1566 shellbase = p;
1567
1568 /* Search for the basename of the shell (with standard
1569 executable extensions) along the $PATH. */
1570 if (pathv)
1571 pathlen = strlen (pathv->value);
1572 path_string = (char *)xmalloc (5 + pathlen + 2 + 1);
1573 /* On MSDOS, current directory is considered as part of $PATH. */
1574 sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1575 fake_env[0] = path_string;
1576 fake_env[1] = (char *)0;
1577 if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1578 {
1579 char *p;
1580
1581 for (p = shellpath; *p; p++)
1582 {
1583 if (*p == '\\')
1584 *p = '/';
1585 }
1586 v = define_variable_loc (varname, varname_len,
1587 shellpath, origin,
1588 flavor == f_recursive, flocp);
1589 }
1590 else
1591 v = lookup_variable (varname, varname_len);
1592
1593 free (path_string);
1594 }
1595 }
1596 else
1597#endif /* __MSDOS__ */
1598#ifdef WINDOWS32
1599 if ( varname_len == sizeof("SHELL") - 1 /* bird */
1600 && (origin == o_file || origin == o_override || origin == o_command)
1601 && streq (varname, "SHELL"))
1602 {
1603 extern char *default_shell;
1604
1605 /* Call shell locator function. If it returns TRUE, then
1606 set no_default_sh_exe to indicate sh was found and
1607 set new value for SHELL variable. */
1608
1609 if (find_and_set_default_shell (p))
1610 {
1611 v = define_variable_in_set (varname, varname_len, default_shell,
1612# ifdef CONFIG_WITH_VALUE_LENGTH
1613 ~0U, 1 /* duplicate_value */,
1614# endif
1615 origin, flavor == f_recursive,
1616 (target_var
1617 ? current_variable_set_list->set
1618 : NULL),
1619 flocp);
1620 no_default_sh_exe = 0;
1621 }
1622 else
1623 v = lookup_variable (varname, varname_len);
1624# ifdef CONFIG_WITH_VALUE_LENGTH
1625 if (alloc_value)
1626 free (alloc_value);
1627# endif
1628 }
1629 else
1630#endif
1631
1632 /* If we are defining variables inside an $(eval ...), we might have a
1633 different variable context pushed, not the global context (maybe we're
1634 inside a $(call ...) or something. Since this function is only ever
1635 invoked in places where we want to define globally visible variables,
1636 make sure we define this variable in the global set. */
1637
1638 v = define_variable_in_set (varname, varname_len, p,
1639#ifdef CONFIG_WITH_VALUE_LENGTH
1640 value_len, !alloc_value,
1641#endif
1642 origin, flavor == f_recursive,
1643 (target_var
1644 ? current_variable_set_list->set : NULL),
1645 flocp);
1646 v->append = append;
1647 v->conditional = conditional;
1648
1649#ifndef CONFIG_WITH_VALUE_LENGTH
1650 if (alloc_value)
1651 free (alloc_value);
1652#endif
1653
1654 return v;
1655}
1656
1657
1658/* Try to interpret LINE (a null-terminated string) as a variable definition.
1659
1660 ORIGIN may be o_file, o_override, o_env, o_env_override,
1661 or o_command specifying that the variable definition comes
1662 from a makefile, an override directive, the environment with
1663 or without the -e switch, or the command line.
1664
1665 See the comments for parse_variable_definition().
1666
1667 If LINE was recognized as a variable definition, a pointer to its `struct
1668 variable' is returned. If LINE is not a variable definition, NULL is
1669 returned. */
1670
1671struct variable *
1672parse_variable_definition (struct variable *v, char *line)
1673{
1674 register int c;
1675 register char *p = line;
1676 register char *beg;
1677 register char *end;
1678 enum variable_flavor flavor = f_bogus;
1679 char *name;
1680
1681 while (1)
1682 {
1683 c = *p++;
1684 if (c == '\0' || c == '#')
1685 return 0;
1686 if (c == '=')
1687 {
1688 end = p - 1;
1689 flavor = f_recursive;
1690 break;
1691 }
1692 else if (c == ':')
1693 if (*p == '=')
1694 {
1695 end = p++ - 1;
1696 flavor = f_simple;
1697 break;
1698 }
1699 else
1700 /* A colon other than := is a rule line, not a variable defn. */
1701 return 0;
1702 else if (c == '+' && *p == '=')
1703 {
1704 end = p++ - 1;
1705 flavor = f_append;
1706 break;
1707 }
1708 else if (c == '?' && *p == '=')
1709 {
1710 end = p++ - 1;
1711 flavor = f_conditional;
1712 break;
1713 }
1714 else if (c == '$')
1715 {
1716 /* This might begin a variable expansion reference. Make sure we
1717 don't misrecognize chars inside the reference as =, := or +=. */
1718 char closeparen;
1719 int count;
1720 c = *p++;
1721 if (c == '(')
1722 closeparen = ')';
1723 else if (c == '{')
1724 closeparen = '}';
1725 else
1726 continue; /* Nope. */
1727
1728 /* P now points past the opening paren or brace.
1729 Count parens or braces until it is matched. */
1730 count = 0;
1731 for (; *p != '\0'; ++p)
1732 {
1733 if (*p == c)
1734 ++count;
1735 else if (*p == closeparen && --count < 0)
1736 {
1737 ++p;
1738 break;
1739 }
1740 }
1741 }
1742 }
1743 v->flavor = flavor;
1744
1745 beg = next_token (line);
1746 while (end > beg && isblank ((unsigned char)end[-1]))
1747 --end;
1748 p = next_token (p);
1749 v->value = p;
1750#ifdef CONFIG_WITH_VALUE_LENGTH
1751 v->value_length = v->value_alloc_len = -1;
1752#endif
1753
1754 /* Expand the name, so "$(foo)bar = baz" works. */
1755 name = (char *) alloca (end - beg + 1);
1756 bcopy (beg, name, end - beg);
1757 name[end - beg] = '\0';
1758 v->name = allocated_variable_expand (name);
1759
1760 if (v->name[0] == '\0')
1761 fatal (&v->fileinfo, _("empty variable name"));
1762
1763 return v;
1764}
1765
1766
1767/* Try to interpret LINE (a null-terminated string) as a variable definition.
1768
1769 ORIGIN may be o_file, o_override, o_env, o_env_override,
1770 or o_command specifying that the variable definition comes
1771 from a makefile, an override directive, the environment with
1772 or without the -e switch, or the command line.
1773
1774 See the comments for parse_variable_definition().
1775
1776 If LINE was recognized as a variable definition, a pointer to its `struct
1777 variable' is returned. If LINE is not a variable definition, NULL is
1778 returned. */
1779
1780struct variable *
1781try_variable_definition (const struct floc *flocp, char *line,
1782 enum variable_origin origin, int target_var)
1783{
1784 struct variable v;
1785 struct variable *vp;
1786
1787 if (flocp != 0)
1788 v.fileinfo = *flocp;
1789 else
1790 v.fileinfo.filenm = 0;
1791
1792 if (!parse_variable_definition (&v, line))
1793 return 0;
1794
1795 vp = do_variable_definition (flocp, v.name, v.value,
1796 origin, v.flavor, target_var);
1797
1798 free (v.name);
1799
1800 return vp;
1801}
1802
1803
1804/* Print information for variable V, prefixing it with PREFIX. */
1805
1806static void
1807print_variable (const void *item, void *arg)
1808{
1809 const struct variable *v = (struct variable *) item;
1810 const char *prefix = (char *) arg;
1811 const char *origin;
1812
1813 switch (v->origin)
1814 {
1815 case o_default:
1816 origin = _("default");
1817 break;
1818 case o_env:
1819 origin = _("environment");
1820 break;
1821 case o_file:
1822 origin = _("makefile");
1823 break;
1824 case o_env_override:
1825 origin = _("environment under -e");
1826 break;
1827 case o_command:
1828 origin = _("command line");
1829 break;
1830 case o_override:
1831 origin = _("`override' directive");
1832 break;
1833 case o_automatic:
1834 origin = _("automatic");
1835 break;
1836 case o_invalid:
1837 default:
1838 abort ();
1839 }
1840 fputs ("# ", stdout);
1841 fputs (origin, stdout);
1842 if (v->fileinfo.filenm)
1843 printf (_(" (from `%s', line %lu)"),
1844 v->fileinfo.filenm, v->fileinfo.lineno);
1845 putchar ('\n');
1846 fputs (prefix, stdout);
1847
1848 /* Is this a `define'? */
1849 if (v->recursive && strchr (v->value, '\n') != 0)
1850 printf ("define %s\n%s\nendef\n", v->name, v->value);
1851 else
1852 {
1853 register char *p;
1854
1855 printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1856
1857 /* Check if the value is just whitespace. */
1858 p = next_token (v->value);
1859 if (p != v->value && *p == '\0')
1860 /* All whitespace. */
1861 printf ("$(subst ,,%s)", v->value);
1862 else if (v->recursive)
1863 fputs (v->value, stdout);
1864 else
1865 /* Double up dollar signs. */
1866 for (p = v->value; *p != '\0'; ++p)
1867 {
1868 if (*p == '$')
1869 putchar ('$');
1870 putchar (*p);
1871 }
1872 putchar ('\n');
1873 }
1874}
1875
1876
1877/* Print all the variables in SET. PREFIX is printed before
1878 the actual variable definitions (everything else is comments). */
1879
1880void
1881print_variable_set (struct variable_set *set, char *prefix)
1882{
1883 hash_map_arg (&set->table, print_variable, prefix);
1884
1885 fputs (_("# variable set hash-table stats:\n"), stdout);
1886 fputs ("# ", stdout);
1887 hash_print_stats (&set->table, stdout);
1888 putc ('\n', stdout);
1889}
1890
1891/* Print the data base of variables. */
1892
1893void
1894print_variable_data_base (void)
1895{
1896 puts (_("\n# Variables\n"));
1897
1898 print_variable_set (&global_variable_set, "");
1899
1900 puts (_("\n# Pattern-specific Variable Values"));
1901
1902 {
1903 struct pattern_var *p;
1904 int rules = 0;
1905
1906 for (p = pattern_vars; p != 0; p = p->next)
1907 {
1908 ++rules;
1909 printf ("\n%s :\n", p->target);
1910 print_variable (&p->variable, "# ");
1911 }
1912
1913 if (rules == 0)
1914 puts (_("\n# No pattern-specific variable values."));
1915 else
1916 printf (_("\n# %u pattern-specific variable values"), rules);
1917 }
1918}
1919
1920
1921/* Print all the local variables of FILE. */
1922
1923void
1924print_file_variables (struct file *file)
1925{
1926 if (file->variables != 0)
1927 print_variable_set (file->variables->set, "# ");
1928}
1929
1930#ifdef WINDOWS32
1931void
1932sync_Path_environment (void)
1933{
1934 char *path = allocated_variable_expand ("$(PATH)");
1935 static char *environ_path = NULL;
1936
1937 if (!path)
1938 return;
1939
1940 /*
1941 * If done this before, don't leak memory unnecessarily.
1942 * Free the previous entry before allocating new one.
1943 */
1944 if (environ_path)
1945 free (environ_path);
1946
1947 /*
1948 * Create something WINDOWS32 world can grok
1949 */
1950 convert_Path_to_windows32 (path, ';');
1951 environ_path = concat ("PATH", "=", path);
1952 putenv (environ_path);
1953 free (path);
1954}
1955#endif
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