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source: kBuild/trunk/src/kmk/variable.c@ 1117

Last change on this file since 1117 was 1117, checked in by bird, 17 years ago

kmk_builtin_cmp.

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1/* Internals of variables for GNU Make.
2Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
31998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
4Foundation, Inc.
5This file is part of GNU Make.
6
7GNU Make is free software; you can redistribute it and/or modify it under the
8terms of the GNU General Public License as published by the Free Software
9Foundation; either version 2, or (at your option) any later version.
10
11GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License along with
16GNU Make; see the file COPYING. If not, write to the Free Software
17Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
18
19#include "make.h"
20
21#include <assert.h>
22
23#include "dep.h"
24#include "filedef.h"
25#include "job.h"
26#include "commands.h"
27#include "variable.h"
28#include "rule.h"
29#ifdef WINDOWS32
30#include "pathstuff.h"
31#endif
32#include "hash.h"
33#ifdef KMK
34# include "kbuild.h"
35#endif
36
37/* Chain of all pattern-specific variables. */
38
39static struct pattern_var *pattern_vars;
40
41/* Pointer to last struct in the chain, so we can add onto the end. */
42
43static struct pattern_var *last_pattern_var;
44
45/* Create a new pattern-specific variable struct. */
46
47struct pattern_var *
48create_pattern_var (const char *target, const char *suffix)
49{
50 register struct pattern_var *p = xmalloc (sizeof (struct pattern_var));
51
52 if (last_pattern_var != 0)
53 last_pattern_var->next = p;
54 else
55 pattern_vars = p;
56 last_pattern_var = p;
57 p->next = 0;
58
59 p->target = target;
60 p->len = strlen (target);
61 p->suffix = suffix + 1;
62
63 return p;
64}
65
66/* Look up a target in the pattern-specific variable list. */
67
68static struct pattern_var *
69lookup_pattern_var (struct pattern_var *start, const char *target)
70{
71 struct pattern_var *p;
72 unsigned int targlen = strlen(target);
73
74 for (p = start ? start->next : pattern_vars; p != 0; p = p->next)
75 {
76 const char *stem;
77 unsigned int stemlen;
78
79 if (p->len > targlen)
80 /* It can't possibly match. */
81 continue;
82
83 /* From the lengths of the filename and the pattern parts,
84 find the stem: the part of the filename that matches the %. */
85 stem = target + (p->suffix - p->target - 1);
86 stemlen = targlen - p->len + 1;
87
88 /* Compare the text in the pattern before the stem, if any. */
89 if (stem > target && !strneq (p->target, target, stem - target))
90 continue;
91
92 /* Compare the text in the pattern after the stem, if any.
93 We could test simply using streq, but this way we compare the
94 first two characters immediately. This saves time in the very
95 common case where the first character matches because it is a
96 period. */
97 if (*p->suffix == stem[stemlen]
98 && (*p->suffix == '\0' || streq (&p->suffix[1], &stem[stemlen+1])))
99 break;
100 }
101
102 return p;
103}
104
105
106/* Hash table of all global variable definitions. */
107
108#ifdef VARIABLE_HASH
109# ifdef _MSC_VER
110# define inline _inline
111typedef signed int int32_t;
112typedef signed short int int16_t;
113# endif
114static inline unsigned long variable_hash_2i(register const unsigned char *var, register int length)
115{
116 register unsigned int hash = 0;
117 var += length;
118 switch (length)
119 {
120 default:
121 case 16: hash = *--var + (hash << 6) + (hash << 16) - hash;
122 case 15: hash = *--var + (hash << 6) + (hash << 16) - hash;
123 case 14: hash = *--var + (hash << 6) + (hash << 16) - hash;
124 case 13: hash = *--var + (hash << 6) + (hash << 16) - hash;
125 case 12: hash = *--var + (hash << 6) + (hash << 16) - hash;
126 case 11: hash = *--var + (hash << 6) + (hash << 16) - hash;
127 case 10: hash = *--var + (hash << 6) + (hash << 16) - hash;
128 case 9: hash = *--var + (hash << 6) + (hash << 16) - hash;
129 case 8: hash = *--var + (hash << 6) + (hash << 16) - hash;
130 case 7: hash = *--var + (hash << 6) + (hash << 16) - hash;
131 case 6: hash = *--var + (hash << 6) + (hash << 16) - hash;
132 case 5: hash = *--var + (hash << 6) + (hash << 16) - hash;
133 case 4: hash = *--var + (hash << 6) + (hash << 16) - hash;
134 case 3: hash = *--var + (hash << 6) + (hash << 16) - hash;
135 case 2: hash = *--var + (hash << 6) + (hash << 16) - hash;
136 case 1: hash = *--var + (hash << 6) + (hash << 16) - hash;
137 case 0:
138 break;
139 }
140 return hash;
141}
142
143static inline unsigned long variable_hash_1i(register const unsigned char *var, register int length)
144{
145 register unsigned int hash = ((5381 << 5) + 5381) + *var;
146 switch (length)
147 {
148 default:
149 case 8: hash = ((hash << 5) + hash) + var[7];
150 case 7: hash = ((hash << 5) + hash) + var[6];
151 case 6: hash = ((hash << 5) + hash) + var[5];
152 case 5: hash = ((hash << 5) + hash) + var[4];
153 case 4: hash = ((hash << 5) + hash) + var[3];
154 case 3: hash = ((hash << 5) + hash) + var[2];
155 case 2: hash = ((hash << 5) + hash) + var[1];
156 case 1: return hash;
157 case 0: return 5381; /* shouldn't happen */
158 }
159}
160#endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
161
162static unsigned long
163variable_hash_1 (const void *keyv)
164{
165 struct variable const *key = (struct variable const *) keyv;
166#ifdef VARIABLE_HASH /* bird */
167# ifdef VARIABLE_HASH_STRICT
168 if (key->hash1 != variable_hash_1i (key->name, key->length))
169 __asm__("int3");
170 if (key->hash2 && key->hash2 != variable_hash_2i (key->name, key->length))
171 __asm__("int3");
172# endif
173 return key->hash1;
174#else
175# ifdef CONFIG_WITH_OPTIMIZATION_HACKS
176 return variable_hash_1i (key->name, key->length);
177# else
178 return_STRING_N_HASH_1 (key->name, key->length);
179# endif
180#endif
181}
182
183static unsigned long
184variable_hash_2 (const void *keyv)
185{
186#ifdef VARIABLE_HASH /* bird */
187 struct variable *key = (struct variable *) keyv;
188 if (!key->hash2)
189 key->hash2 = variable_hash_2i (key->name, key->length);
190 return key->hash2;
191#else
192 struct variable const *key = (struct variable const *) keyv;
193# ifdef CONFIG_WITH_OPTIMIZATION_HACKS
194 return variable_hash_2i (key->name, key->length);
195# else
196 return_STRING_N_HASH_2 (key->name, key->length);
197# endif
198#endif
199}
200
201static int
202variable_hash_cmp (const void *xv, const void *yv)
203{
204 struct variable const *x = (struct variable const *) xv;
205 struct variable const *y = (struct variable const *) yv;
206 int result = x->length - y->length;
207 if (result)
208 return result;
209#ifdef VARIABLE_HASH_STRICT /* bird */
210 if (x->hash1 != variable_hash_1i (x->name, x->length))
211 __asm__("int3");
212 if (x->hash2 && x->hash2 != variable_hash_2i (x->name, x->length))
213 __asm__("int3");
214 if (y->hash1 != variable_hash_1i (y->name, y->length))
215 __asm__("int3");
216 if (y->hash2 && y->hash2 != variable_hash_2i (y->name, y->length))
217 __asm__("int3");
218#endif
219#ifdef VARIABLE_HASH
220 /* hash 1 */
221 result = x->hash1 - y->hash1;
222 if (result)
223 return result;
224#endif
225#ifdef CONFIG_WITH_OPTIMIZATION_HACKS /* bird: speed */
226 {
227 const char *xs = x->name;
228 const char *ys = y->name;
229 switch (x->length)
230 {
231 case 8:
232 result = *(int32_t*)(xs + 4) - *(int32_t*)(ys + 4);
233 if (result)
234 return result;
235 return *(int32_t*)xs - *(int32_t*)ys;
236 case 7:
237 result = xs[6] - ys[6];
238 if (result)
239 return result;
240 case 6:
241 result = *(int32_t*)xs - *(int32_t*)ys;
242 if (result)
243 return result;
244 return *(int16_t*)(xs + 4) - *(int16_t*)(ys + 4);
245 case 5:
246 result = xs[4] - ys[4];
247 if (result)
248 return result;
249 case 4:
250 return *(int32_t*)xs - *(int32_t*)ys;
251 case 3:
252 result = xs[2] - ys[2];
253 if (result)
254 return result;
255 case 2:
256 return *(int16_t*)xs - *(int16_t*)ys;
257 case 1:
258 return *xs - *ys;
259 case 0:
260 return 0;
261 }
262 }
263#endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
264#ifdef VARIABLE_HASH
265 /* hash 2 */
266 if (!x->hash2)
267 ((struct variable *)x)->hash2 = variable_hash_2i (x->name, x->length);
268 if (!y->hash2)
269 ((struct variable *)y)->hash2 = variable_hash_2i (y->name, y->length);
270 result = x->hash2 - y->hash2;
271 if (result)
272 return result;
273#endif
274#ifdef CONFIG_WITH_OPTIMIZATION_HACKS
275 return memcmp (x->name, y->name, x->length);
276#else
277 return_STRING_N_COMPARE (x->name, y->name, x->length);
278#endif
279}
280
281#ifndef VARIABLE_BUCKETS
282# ifdef KMK /* Move to Makefile.kmk? */
283# define VARIABLE_BUCKETS 16384
284# else /*!KMK*/
285#define VARIABLE_BUCKETS 523
286# endif /*!KMK*/
287#endif
288#ifndef PERFILE_VARIABLE_BUCKETS
289#define PERFILE_VARIABLE_BUCKETS 23
290#endif
291#ifndef SMALL_SCOPE_VARIABLE_BUCKETS
292#define SMALL_SCOPE_VARIABLE_BUCKETS 13
293#endif
294
295static struct variable_set global_variable_set;
296static struct variable_set_list global_setlist
297 = { 0, &global_variable_set };
298struct variable_set_list *current_variable_set_list = &global_setlist;
299
300
301/* Implement variables. */
302
303void
304init_hash_global_variable_set (void)
305{
306 hash_init (&global_variable_set.table, VARIABLE_BUCKETS,
307 variable_hash_1, variable_hash_2, variable_hash_cmp);
308}
309
310/* Define variable named NAME with value VALUE in SET. VALUE is copied.
311 LENGTH is the length of NAME, which does not need to be null-terminated.
312 ORIGIN specifies the origin of the variable (makefile, command line
313 or environment).
314 If RECURSIVE is nonzero a flag is set in the variable saying
315 that it should be recursively re-expanded. */
316
317#ifdef CONFIG_WITH_VALUE_LENGTH
318struct variable *
319define_variable_in_set (const char *name, unsigned int length,
320 const char *value, unsigned int value_length, int duplicate_value,
321 enum variable_origin origin, int recursive,
322 struct variable_set *set, const struct floc *flocp)
323#else
324struct variable *
325define_variable_in_set (const char *name, unsigned int length,
326 const char *value, enum variable_origin origin,
327 int recursive, struct variable_set *set,
328 const struct floc *flocp)
329#endif
330{
331 struct variable *v;
332 struct variable **var_slot;
333 struct variable var_key;
334
335 if (set == NULL)
336 set = &global_variable_set;
337
338 var_key.name = (char *) name;
339 var_key.length = length;
340#ifdef VARIABLE_HASH /* bird */
341 var_key.hash1 = variable_hash_1i (name, length);
342 var_key.hash2 = 0;
343#endif
344 var_slot = (struct variable **) hash_find_slot (&set->table, &var_key);
345
346 if (env_overrides && origin == o_env)
347 origin = o_env_override;
348
349 v = *var_slot;
350 if (! HASH_VACANT (v))
351 {
352 if (env_overrides && v->origin == o_env)
353 /* V came from in the environment. Since it was defined
354 before the switches were parsed, it wasn't affected by -e. */
355 v->origin = o_env_override;
356
357 /* A variable of this name is already defined.
358 If the old definition is from a stronger source
359 than this one, don't redefine it. */
360 if ((int) origin >= (int) v->origin)
361 {
362#ifdef CONFIG_WITH_VALUE_LENGTH
363 if (value_length == ~0U)
364 value_length = strlen (value);
365 else
366 assert (value_length == strlen (value));
367 if (!duplicate_value)
368 {
369 if (v->value != 0)
370 free (v->value);
371 v->value = (char *)value;
372 v->value_alloc_len = value_length + 1;
373 }
374 else
375 {
376 if ((unsigned int)v->value_alloc_len <= value_length)
377 {
378 free (v->value);
379 v->value_alloc_len = (value_length + 0x40) & ~0x3f;
380 v->value = xmalloc (v->value_alloc_len);
381 }
382 memcpy (v->value, value, value_length + 1);
383 }
384 v->value_length = value_length;
385#else
386 if (v->value != 0)
387 free (v->value);
388 v->value = xstrdup (value);
389#endif
390 if (flocp != 0)
391 v->fileinfo = *flocp;
392 else
393 v->fileinfo.filenm = 0;
394 v->origin = origin;
395 v->recursive = recursive;
396 }
397 return v;
398 }
399
400 /* Create a new variable definition and add it to the hash table. */
401
402 v = xmalloc (sizeof (struct variable));
403 v->name = savestring (name, length);
404 v->length = length;
405#ifdef VARIABLE_HASH /* bird */
406 v->hash1 = variable_hash_1i (name, length);
407 v->hash2 = 0;
408#endif
409 hash_insert_at (&set->table, v, var_slot);
410#ifdef CONFIG_WITH_VALUE_LENGTH
411 if (value_length == ~0U)
412 value_length = strlen (value);
413 else
414 assert (value_length == strlen (value));
415 v->value_length = value_length;
416 if (!duplicate_value)
417 {
418 v->value_alloc_len = value_length + 1;
419 v->value = (char *)value;
420 }
421 else
422 {
423 v->value_alloc_len = (value_length + 32) & ~31;
424 v->value = xmalloc (v->value_alloc_len);
425 memcpy (v->value, value, value_length + 1);
426 }
427#else
428 v->value = xstrdup (value);
429#endif
430 if (flocp != 0)
431 v->fileinfo = *flocp;
432 else
433 v->fileinfo.filenm = 0;
434 v->origin = origin;
435 v->recursive = recursive;
436 v->special = 0;
437 v->expanding = 0;
438 v->exp_count = 0;
439 v->per_target = 0;
440 v->append = 0;
441 v->export = v_default;
442
443 v->exportable = 1;
444 if (*name != '_' && (*name < 'A' || *name > 'Z')
445 && (*name < 'a' || *name > 'z'))
446 v->exportable = 0;
447 else
448 {
449 for (++name; *name != '\0'; ++name)
450 if (*name != '_' && (*name < 'a' || *name > 'z')
451 && (*name < 'A' || *name > 'Z') && !ISDIGIT(*name))
452 break;
453
454 if (*name != '\0')
455 v->exportable = 0;
456 }
457
458 return v;
459}
460
461
462/* If the variable passed in is "special", handle its special nature.
463 Currently there are two such variables, both used for introspection:
464 .VARIABLES expands to a list of all the variables defined in this instance
465 of make.
466 .TARGETS expands to a list of all the targets defined in this
467 instance of make.
468 Returns the variable reference passed in. */
469
470#define EXPANSION_INCREMENT(_l) ((((_l) / 500) + 1) * 500)
471
472static struct variable *
473handle_special_var (struct variable *var)
474{
475 static unsigned long last_var_count = 0;
476
477
478 /* This one actually turns out to be very hard, due to the way the parser
479 records targets. The way it works is that target information is collected
480 internally until make knows the target is completely specified. It unitl
481 it sees that some new construct (a new target or variable) is defined that
482 it knows the previous one is done. In short, this means that if you do
483 this:
484
485 all:
486
487 TARGS := $(.TARGETS)
488
489 then $(TARGS) won't contain "all", because it's not until after the
490 variable is created that the previous target is completed.
491
492 Changing this would be a major pain. I think a less complex way to do it
493 would be to pre-define the target files as soon as the first line is
494 parsed, then come back and do the rest of the definition as now. That
495 would allow $(.TARGETS) to be correct without a major change to the way
496 the parser works.
497
498 if (streq (var->name, ".TARGETS"))
499 var->value = build_target_list (var->value);
500 else
501 */
502
503 if (streq (var->name, ".VARIABLES")
504 && global_variable_set.table.ht_fill != last_var_count)
505 {
506 unsigned long max = EXPANSION_INCREMENT (strlen (var->value));
507 unsigned long len;
508 char *p;
509 struct variable **vp = (struct variable **) global_variable_set.table.ht_vec;
510 struct variable **end = &vp[global_variable_set.table.ht_size];
511
512 /* Make sure we have at least MAX bytes in the allocated buffer. */
513 var->value = xrealloc (var->value, max);
514
515 /* Walk through the hash of variables, constructing a list of names. */
516 p = var->value;
517 len = 0;
518 for (; vp < end; ++vp)
519 if (!HASH_VACANT (*vp))
520 {
521 struct variable *v = *vp;
522 int l = v->length;
523
524 len += l + 1;
525 if (len > max)
526 {
527 unsigned long off = p - var->value;
528
529 max += EXPANSION_INCREMENT (l + 1);
530 var->value = xrealloc (var->value, max);
531 p = &var->value[off];
532 }
533
534 memcpy (p, v->name, l);
535 p += l;
536 *(p++) = ' ';
537 }
538 *(p-1) = '\0';
539
540 /* Remember how many variables are in our current count. Since we never
541 remove variables from the list, this is a reliable way to know whether
542 the list is up to date or needs to be recomputed. */
543
544 last_var_count = global_variable_set.table.ht_fill;
545 }
546
547 return var;
548}
549
550
551
552/* Lookup a variable whose name is a string starting at NAME
553 and with LENGTH chars. NAME need not be null-terminated.
554 Returns address of the `struct variable' containing all info
555 on the variable, or nil if no such variable is defined. */
556
557struct variable *
558lookup_variable (const char *name, unsigned int length)
559{
560 const struct variable_set_list *setlist;
561 struct variable var_key;
562
563 var_key.name = (char *) name;
564 var_key.length = length;
565#ifdef VARIABLE_HASH /* bird */
566 var_key.hash1 = variable_hash_1i (name, length);
567 var_key.hash2 = 0;
568#endif
569
570 for (setlist = current_variable_set_list;
571 setlist != 0; setlist = setlist->next)
572 {
573#ifdef VARIABLE_HASH /* bird: speed */
574 struct hash_table *ht = &setlist->set->table;
575 unsigned int hash_1 = var_key.hash1;
576 struct variable *v;
577
578 ht->ht_lookups++;
579 for (;;)
580 {
581 hash_1 &= (ht->ht_size - 1);
582 v = (struct variable *)ht->ht_vec[hash_1];
583
584 if (v == 0)
585 break;
586 if ((void *)v != hash_deleted_item)
587 {
588 if (variable_hash_cmp(&var_key, v) == 0)
589 {
590# ifdef VARIABLE_HASH_STRICT /* bird */
591 struct variable *v2 = (struct variable *) hash_find_item ((struct hash_table *) &setlist->set->table, &var_key);
592 assert(v2 == v);
593# endif
594 return v->special ? handle_special_var (v) : v;
595 }
596 ht->ht_collisions++;
597 }
598 if (!var_key.hash2)
599 var_key.hash2 = variable_hash_2i(name, length);
600 hash_1 += (var_key.hash2 | 1);
601 }
602
603#else /* !VARIABLE_HASH */
604 const struct variable_set *set = setlist->set;
605 struct variable *v;
606
607 v = (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key);
608 if (v)
609 return v->special ? handle_special_var (v) : v;
610#endif /* !VARIABLE_HASH */
611 }
612
613#ifdef VMS
614 /* since we don't read envp[] on startup, try to get the
615 variable via getenv() here. */
616 {
617 char *vname = alloca (length + 1);
618 char *value;
619 strncpy (vname, name, length);
620 vname[length] = 0;
621 value = getenv (vname);
622 if (value != 0)
623 {
624 char *sptr;
625 int scnt;
626
627 sptr = value;
628 scnt = 0;
629
630 while ((sptr = strchr (sptr, '$')))
631 {
632 scnt++;
633 sptr++;
634 }
635
636 if (scnt > 0)
637 {
638 char *nvalue;
639 char *nptr;
640
641 nvalue = alloca (strlen (value) + scnt + 1);
642 sptr = value;
643 nptr = nvalue;
644
645 while (*sptr)
646 {
647 if (*sptr == '$')
648 {
649 *nptr++ = '$';
650 *nptr++ = '$';
651 }
652 else
653 {
654 *nptr++ = *sptr;
655 }
656 sptr++;
657 }
658
659 *nptr = '\0';
660 return define_variable (vname, length, nvalue, o_env, 1);
661
662 }
663
664 return define_variable (vname, length, value, o_env, 1);
665 }
666 }
667#endif /* VMS */
668
669 return 0;
670}
671
672
673/* Lookup a variable whose name is a string starting at NAME
674 and with LENGTH chars in set SET. NAME need not be null-terminated.
675 Returns address of the `struct variable' containing all info
676 on the variable, or nil if no such variable is defined. */
677
678struct variable *
679lookup_variable_in_set (const char *name, unsigned int length,
680 const struct variable_set *set)
681{
682 struct variable var_key;
683
684 var_key.name = (char *) name;
685 var_key.length = length;
686#ifdef VARIABLE_HASH /* bird */
687 var_key.hash1 = variable_hash_1i (name, length);
688 var_key.hash2 = 0;
689#endif
690
691 return (struct variable *) hash_find_item ((struct hash_table *) &set->table, &var_key);
692}
693
694
695/* Initialize FILE's variable set list. If FILE already has a variable set
696 list, the topmost variable set is left intact, but the the rest of the
697 chain is replaced with FILE->parent's setlist. If FILE is a double-colon
698 rule, then we will use the "root" double-colon target's variable set as the
699 parent of FILE's variable set.
700
701 If we're READING a makefile, don't do the pattern variable search now,
702 since the pattern variable might not have been defined yet. */
703
704void
705initialize_file_variables (struct file *file, int reading)
706{
707 struct variable_set_list *l = file->variables;
708
709 if (l == 0)
710 {
711 l = (struct variable_set_list *)
712 xmalloc (sizeof (struct variable_set_list));
713 l->set = xmalloc (sizeof (struct variable_set));
714 hash_init (&l->set->table, PERFILE_VARIABLE_BUCKETS,
715 variable_hash_1, variable_hash_2, variable_hash_cmp);
716 file->variables = l;
717 }
718
719 /* If this is a double-colon, then our "parent" is the "root" target for
720 this double-colon rule. Since that rule has the same name, parent,
721 etc. we can just use its variables as the "next" for ours. */
722
723 if (file->double_colon && file->double_colon != file)
724 {
725 initialize_file_variables (file->double_colon, reading);
726 l->next = file->double_colon->variables;
727 return;
728 }
729
730 if (file->parent == 0)
731 l->next = &global_setlist;
732 else
733 {
734 initialize_file_variables (file->parent, reading);
735 l->next = file->parent->variables;
736 }
737
738 /* If we're not reading makefiles and we haven't looked yet, see if
739 we can find pattern variables for this target. */
740
741 if (!reading && !file->pat_searched)
742 {
743 struct pattern_var *p;
744
745 p = lookup_pattern_var (0, file->name);
746 if (p != 0)
747 {
748 struct variable_set_list *global = current_variable_set_list;
749
750 /* We found at least one. Set up a new variable set to accumulate
751 all the pattern variables that match this target. */
752
753 file->pat_variables = create_new_variable_set ();
754 current_variable_set_list = file->pat_variables;
755
756 do
757 {
758 /* We found one, so insert it into the set. */
759
760 struct variable *v;
761
762 if (p->variable.flavor == f_simple)
763 {
764 v = define_variable_loc (
765 p->variable.name, strlen (p->variable.name),
766 p->variable.value, p->variable.origin,
767 0, &p->variable.fileinfo);
768
769 v->flavor = f_simple;
770 }
771 else
772 {
773 v = do_variable_definition (
774 &p->variable.fileinfo, p->variable.name,
775 p->variable.value, p->variable.origin,
776 p->variable.flavor, 1);
777 }
778
779 /* Also mark it as a per-target and copy export status. */
780 v->per_target = p->variable.per_target;
781 v->export = p->variable.export;
782 }
783 while ((p = lookup_pattern_var (p, file->name)) != 0);
784
785 current_variable_set_list = global;
786 }
787 file->pat_searched = 1;
788 }
789
790 /* If we have a pattern variable match, set it up. */
791
792 if (file->pat_variables != 0)
793 {
794 file->pat_variables->next = l->next;
795 l->next = file->pat_variables;
796 }
797}
798
799
800/* Pop the top set off the current variable set list,
801 and free all its storage. */
802
803struct variable_set_list *
804create_new_variable_set (void)
805{
806 register struct variable_set_list *setlist;
807 register struct variable_set *set;
808
809 set = xmalloc (sizeof (struct variable_set));
810 hash_init (&set->table, SMALL_SCOPE_VARIABLE_BUCKETS,
811 variable_hash_1, variable_hash_2, variable_hash_cmp);
812
813 setlist = (struct variable_set_list *)
814 xmalloc (sizeof (struct variable_set_list));
815 setlist->set = set;
816 setlist->next = current_variable_set_list;
817
818 return setlist;
819}
820
821static void
822free_variable_name_and_value (const void *item)
823{
824 struct variable *v = (struct variable *) item;
825 free (v->name);
826 free (v->value);
827}
828
829void
830free_variable_set (struct variable_set_list *list)
831{
832 hash_map (&list->set->table, free_variable_name_and_value);
833 hash_free (&list->set->table, 1);
834 free (list->set);
835 free (list);
836}
837
838/* Create a new variable set and push it on the current setlist.
839 If we're pushing a global scope (that is, the current scope is the global
840 scope) then we need to "push" it the other way: file variable sets point
841 directly to the global_setlist so we need to replace that with the new one.
842 */
843
844struct variable_set_list *
845push_new_variable_scope (void)
846{
847 current_variable_set_list = create_new_variable_set();
848 if (current_variable_set_list->next == &global_setlist)
849 {
850 /* It was the global, so instead of new -> &global we want to replace
851 &global with the new one and have &global -> new, with current still
852 pointing to &global */
853 struct variable_set *set = current_variable_set_list->set;
854 current_variable_set_list->set = global_setlist.set;
855 global_setlist.set = set;
856 current_variable_set_list->next = global_setlist.next;
857 global_setlist.next = current_variable_set_list;
858 current_variable_set_list = &global_setlist;
859 }
860 return (current_variable_set_list);
861}
862
863void
864pop_variable_scope (void)
865{
866 struct variable_set_list *setlist;
867 struct variable_set *set;
868
869 /* Can't call this if there's no scope to pop! */
870 assert(current_variable_set_list->next != NULL);
871
872 if (current_variable_set_list != &global_setlist)
873 {
874 /* We're not pointing to the global setlist, so pop this one. */
875 setlist = current_variable_set_list;
876 set = setlist->set;
877 current_variable_set_list = setlist->next;
878 }
879 else
880 {
881 /* This set is the one in the global_setlist, but there is another global
882 set beyond that. We want to copy that set to global_setlist, then
883 delete what used to be in global_setlist. */
884 setlist = global_setlist.next;
885 set = global_setlist.set;
886 global_setlist.set = setlist->set;
887 global_setlist.next = setlist->next;
888 }
889
890 /* Free the one we no longer need. */
891 free (setlist);
892 hash_map (&set->table, free_variable_name_and_value);
893 hash_free (&set->table, 1);
894 free (set);
895}
896
897
898/* Merge FROM_SET into TO_SET, freeing unused storage in FROM_SET. */
899
900static void
901merge_variable_sets (struct variable_set *to_set,
902 struct variable_set *from_set)
903{
904 struct variable **from_var_slot = (struct variable **) from_set->table.ht_vec;
905 struct variable **from_var_end = from_var_slot + from_set->table.ht_size;
906
907 for ( ; from_var_slot < from_var_end; from_var_slot++)
908 if (! HASH_VACANT (*from_var_slot))
909 {
910 struct variable *from_var = *from_var_slot;
911 struct variable **to_var_slot
912 = (struct variable **) hash_find_slot (&to_set->table, *from_var_slot);
913 if (HASH_VACANT (*to_var_slot))
914 hash_insert_at (&to_set->table, from_var, to_var_slot);
915 else
916 {
917 /* GKM FIXME: delete in from_set->table */
918 free (from_var->value);
919 free (from_var);
920 }
921 }
922}
923
924/* Merge SETLIST1 into SETLIST0, freeing unused storage in SETLIST1. */
925
926void
927merge_variable_set_lists (struct variable_set_list **setlist0,
928 struct variable_set_list *setlist1)
929{
930 struct variable_set_list *to = *setlist0;
931 struct variable_set_list *last0 = 0;
932
933 /* If there's nothing to merge, stop now. */
934 if (!setlist1)
935 return;
936
937 /* This loop relies on the fact that all setlists terminate with the global
938 setlist (before NULL). If that's not true, arguably we SHOULD die. */
939 if (to)
940 while (setlist1 != &global_setlist && to != &global_setlist)
941 {
942 struct variable_set_list *from = setlist1;
943 setlist1 = setlist1->next;
944
945 merge_variable_sets (to->set, from->set);
946
947 last0 = to;
948 to = to->next;
949 }
950
951 if (setlist1 != &global_setlist)
952 {
953 if (last0 == 0)
954 *setlist0 = setlist1;
955 else
956 last0->next = setlist1;
957 }
958}
959
960
961/* Define the automatic variables, and record the addresses
962 of their structures so we can change their values quickly. */
963
964void
965define_automatic_variables (void)
966{
967#if defined(WINDOWS32) || defined(__EMX__)
968 extern char* default_shell;
969#else
970 extern char default_shell[];
971#endif
972 register struct variable *v;
973 char buf[200];
974#ifdef KMK
975 const char *envvar;
976#endif
977
978 sprintf (buf, "%u", makelevel);
979 (void) define_variable (MAKELEVEL_NAME, MAKELEVEL_LENGTH, buf, o_env, 0);
980
981 sprintf (buf, "%s%s%s",
982 version_string,
983 (remote_description == 0 || remote_description[0] == '\0')
984 ? "" : "-",
985 (remote_description == 0 || remote_description[0] == '\0')
986 ? "" : remote_description);
987 (void) define_variable ("MAKE_VERSION", 12, buf, o_default, 0);
988
989#ifdef KMK
990 /* Define KMK_VERSION to indicate kMk. */
991 (void) define_variable ("KMK_VERSION", 11, buf, o_default, 0);
992
993 /* Define KBUILD_VERSION* */
994 sprintf (buf, "%d", KBUILD_VERSION_MAJOR);
995 define_variable ("KBUILD_VERSION_MAJOR", sizeof ("KBUILD_VERSION_MAJOR") - 1,
996 buf, o_default, 0);
997 sprintf (buf, "%d", KBUILD_VERSION_MINOR);
998 define_variable ("KBUILD_VERSION_MINOR", sizeof("KBUILD_VERSION_MINOR") - 1,
999 buf, o_default, 0);
1000 sprintf (buf, "%d", KBUILD_VERSION_PATCH);
1001 define_variable ("KBUILD_VERSION_PATCH", sizeof ("KBUILD_VERSION_PATCH") - 1,
1002 buf, o_default, 0);
1003
1004 sprintf (buf, "%d.%d.%d", KBUILD_VERSION_MAJOR, KBUILD_VERSION_MINOR, KBUILD_VERSION_PATCH);
1005 define_variable ("KBUILD_VERSION", sizeof ("KBUILD_VERSION") - 1,
1006 buf, o_default, 0);
1007
1008 /* The build platform defaults. */
1009 envvar = getenv ("BUILD_PLATFORM");
1010 if (!envvar)
1011 define_variable ("BUILD_PLATFORM", sizeof ("BUILD_PLATFORM") - 1,
1012 BUILD_PLATFORM, o_default, 0);
1013 envvar = getenv ("BUILD_PLATFORM_ARCH");
1014 if (!envvar)
1015 define_variable ("BUILD_PLATFORM_ARCH", sizeof ("BUILD_PLATFORM_ARCH") - 1,
1016 BUILD_PLATFORM_ARCH, o_default, 0);
1017 envvar = getenv ("BUILD_PLATFORM_CPU");
1018 if (!envvar)
1019 define_variable ("BUILD_PLATFORM_CPU", sizeof ("BUILD_PLATFORM_CPU") - 1,
1020 BUILD_PLATFORM_CPU, o_default, 0);
1021
1022 /* The kBuild locations. */
1023 define_variable ("PATH_KBUILD", sizeof ("PATH_KBUILD") - 1,
1024 get_path_kbuild (), o_default, 0);
1025 define_variable ("PATH_KBUILD_BIN", sizeof ("PATH_KBUILD_BIN") - 1,
1026 get_path_kbuild_bin (), o_default, 0);
1027
1028 /* Define KMK_FEATURES to indicate various working KMK features. */
1029# if defined(CONFIG_WITH_RSORT) \
1030 && defined(CONFIG_WITH_ABSPATHEX) \
1031 && defined(CONFIG_WITH_TOUPPER_TOLOWER) \
1032 && defined(CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE) \
1033 && defined(CONFIG_WITH_STACK) \
1034 && defined(CONFIG_WITH_MATH) \
1035 && defined(CONFIG_WITH_XARGS) \
1036 && defined(CONFIG_WITH_EXPLICIT_MULTITARGET) \
1037 && defined(CONFIG_WITH_PREPEND_ASSIGNMENT) \
1038 && defined(CONFIG_WITH_SET_CONDITIONALS) \
1039 && defined(KMK_HELPERS)
1040 (void) define_variable ("KMK_FEATURES", 12,
1041 "append-dash-n abspath"
1042 " rsort"
1043 " abspathex"
1044 " toupper tolower"
1045 " comp-vars comp-cmds"
1046 " stack"
1047 " math-int"
1048 " xargs"
1049 " explicit-multitarget"
1050 " prepend-assignment"
1051 " set-conditionals"
1052 " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one "
1053 , o_default, 0);
1054# else /* MSC can't deal with strings mixed with #if/#endif, thus the slow way. */
1055# error "All features should be enabled by default!"
1056 strcpy (buf, "append-dash-n abspath");
1057# if defined (CONFIG_WITH_RSORT)
1058 strcat (buf, " rsort");
1059# endif
1060# if defined (CONFIG_WITH_ABSPATHEX)
1061 strcat (buf, " abspathex");
1062# endif
1063# if defined (CONFIG_WITH_TOUPPER_TOLOWER)
1064 strcat (buf, " toupper tolower");
1065# endif
1066# if defined (CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE)
1067 strcat (buf, " comp-vars comp-cmds");
1068# endif
1069# if defined (CONFIG_WITH_STACK)
1070 strcat (buf, " stack");
1071# endif
1072# if defined (CONFIG_WITH_MATH)
1073 strcat (buf, " math-int");
1074# endif
1075# if defined (CONFIG_WITH_XARGS)
1076 strcat (buf, " xargs");
1077# endif
1078# if defined (CONFIG_WITH_EXPLICIT_MULTITARGET)
1079 strcat (buf, " explicit-multitarget");
1080# endif
1081# if defined (CONFIG_WITH_PREPEND_ASSIGNMENT)
1082 strcat (buf, " prepend-assignment");
1083# endif
1084# if defined (CONFIG_WITH_SET_CONDITIONALS)
1085 strcat (buf, " set-conditionals");
1086# endif
1087# if defined (KMK_HELPERS)
1088 strcat (buf, " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one");
1089# endif
1090 (void) define_variable ("KMK_FEATURES", 12, buf, o_default, 0);
1091# endif
1092
1093#endif /* KMK */
1094
1095#ifdef CONFIG_WITH_KMK_BUILTIN
1096 /* The supported kMk Builtin commands. */
1097 (void) define_variable ("KMK_BUILTIN", 11, "append cat cp cmp echo install ln md5sum mkdir mv printf rm rmdir", o_default, 0);
1098#endif
1099
1100#ifdef __MSDOS__
1101 /* Allow to specify a special shell just for Make,
1102 and use $COMSPEC as the default $SHELL when appropriate. */
1103 {
1104 static char shell_str[] = "SHELL";
1105 const int shlen = sizeof (shell_str) - 1;
1106 struct variable *mshp = lookup_variable ("MAKESHELL", 9);
1107 struct variable *comp = lookup_variable ("COMSPEC", 7);
1108
1109 /* Make $MAKESHELL override $SHELL even if -e is in effect. */
1110 if (mshp)
1111 (void) define_variable (shell_str, shlen,
1112 mshp->value, o_env_override, 0);
1113 else if (comp)
1114 {
1115 /* $COMSPEC shouldn't override $SHELL. */
1116 struct variable *shp = lookup_variable (shell_str, shlen);
1117
1118 if (!shp)
1119 (void) define_variable (shell_str, shlen, comp->value, o_env, 0);
1120 }
1121 }
1122#elif defined(__EMX__)
1123 {
1124 static char shell_str[] = "SHELL";
1125 const int shlen = sizeof (shell_str) - 1;
1126 struct variable *shell = lookup_variable (shell_str, shlen);
1127 struct variable *replace = lookup_variable ("MAKESHELL", 9);
1128
1129 /* if $MAKESHELL is defined in the environment assume o_env_override */
1130 if (replace && *replace->value && replace->origin == o_env)
1131 replace->origin = o_env_override;
1132
1133 /* if $MAKESHELL is not defined use $SHELL but only if the variable
1134 did not come from the environment */
1135 if (!replace || !*replace->value)
1136 if (shell && *shell->value && (shell->origin == o_env
1137 || shell->origin == o_env_override))
1138 {
1139 /* overwrite whatever we got from the environment */
1140 free(shell->value);
1141 shell->value = xstrdup (default_shell);
1142 shell->origin = o_default;
1143 }
1144
1145 /* Some people do not like cmd to be used as the default
1146 if $SHELL is not defined in the Makefile.
1147 With -DNO_CMD_DEFAULT you can turn off this behaviour */
1148# ifndef NO_CMD_DEFAULT
1149 /* otherwise use $COMSPEC */
1150 if (!replace || !*replace->value)
1151 replace = lookup_variable ("COMSPEC", 7);
1152
1153 /* otherwise use $OS2_SHELL */
1154 if (!replace || !*replace->value)
1155 replace = lookup_variable ("OS2_SHELL", 9);
1156# else
1157# warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell
1158# endif
1159
1160 if (replace && *replace->value)
1161 /* overwrite $SHELL */
1162 (void) define_variable (shell_str, shlen, replace->value,
1163 replace->origin, 0);
1164 else
1165 /* provide a definition if there is none */
1166 (void) define_variable (shell_str, shlen, default_shell,
1167 o_default, 0);
1168 }
1169
1170#endif
1171
1172 /* This won't override any definition, but it will provide one if there
1173 isn't one there. */
1174 v = define_variable ("SHELL", 5, default_shell, o_default, 0);
1175
1176 /* On MSDOS we do use SHELL from environment, since it isn't a standard
1177 environment variable on MSDOS, so whoever sets it, does that on purpose.
1178 On OS/2 we do not use SHELL from environment but we have already handled
1179 that problem above. */
1180#if !defined(__MSDOS__) && !defined(__EMX__)
1181 /* Don't let SHELL come from the environment. */
1182 if (*v->value == '\0' || v->origin == o_env || v->origin == o_env_override)
1183 {
1184 free (v->value);
1185 v->origin = o_file;
1186 v->value = xstrdup (default_shell);
1187#ifdef CONFIG_WITH_VALUE_LENGTH
1188 v->value_length = strlen (v->value);
1189 v->value_alloc_len = v->value_length + 1;
1190#endif
1191 }
1192#endif
1193
1194 /* Make sure MAKEFILES gets exported if it is set. */
1195 v = define_variable ("MAKEFILES", 9, "", o_default, 0);
1196 v->export = v_ifset;
1197
1198 /* Define the magic D and F variables in terms of
1199 the automatic variables they are variations of. */
1200
1201#ifdef VMS
1202 define_variable ("@D", 2, "$(dir $@)", o_automatic, 1);
1203 define_variable ("%D", 2, "$(dir $%)", o_automatic, 1);
1204 define_variable ("*D", 2, "$(dir $*)", o_automatic, 1);
1205 define_variable ("<D", 2, "$(dir $<)", o_automatic, 1);
1206 define_variable ("?D", 2, "$(dir $?)", o_automatic, 1);
1207 define_variable ("^D", 2, "$(dir $^)", o_automatic, 1);
1208 define_variable ("+D", 2, "$(dir $+)", o_automatic, 1);
1209#else
1210 define_variable ("@D", 2, "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
1211 define_variable ("%D", 2, "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
1212 define_variable ("*D", 2, "$(patsubst %/,%,$(dir $*))", o_automatic, 1);
1213 define_variable ("<D", 2, "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
1214 define_variable ("?D", 2, "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
1215 define_variable ("^D", 2, "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
1216 define_variable ("+D", 2, "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
1217#endif
1218 define_variable ("@F", 2, "$(notdir $@)", o_automatic, 1);
1219 define_variable ("%F", 2, "$(notdir $%)", o_automatic, 1);
1220 define_variable ("*F", 2, "$(notdir $*)", o_automatic, 1);
1221 define_variable ("<F", 2, "$(notdir $<)", o_automatic, 1);
1222 define_variable ("?F", 2, "$(notdir $?)", o_automatic, 1);
1223 define_variable ("^F", 2, "$(notdir $^)", o_automatic, 1);
1224 define_variable ("+F", 2, "$(notdir $+)", o_automatic, 1);
1225}
1226
1227
1228int export_all_variables;
1229
1230/* Create a new environment for FILE's commands.
1231 If FILE is nil, this is for the `shell' function.
1232 The child's MAKELEVEL variable is incremented. */
1233
1234char **
1235target_environment (struct file *file)
1236{
1237 struct variable_set_list *set_list;
1238 register struct variable_set_list *s;
1239 struct hash_table table;
1240 struct variable **v_slot;
1241 struct variable **v_end;
1242 struct variable makelevel_key;
1243 char **result_0;
1244 char **result;
1245
1246 if (file == 0)
1247 set_list = current_variable_set_list;
1248 else
1249 set_list = file->variables;
1250
1251 hash_init (&table, VARIABLE_BUCKETS,
1252 variable_hash_1, variable_hash_2, variable_hash_cmp);
1253
1254 /* Run through all the variable sets in the list,
1255 accumulating variables in TABLE. */
1256 for (s = set_list; s != 0; s = s->next)
1257 {
1258 struct variable_set *set = s->set;
1259 v_slot = (struct variable **) set->table.ht_vec;
1260 v_end = v_slot + set->table.ht_size;
1261 for ( ; v_slot < v_end; v_slot++)
1262 if (! HASH_VACANT (*v_slot))
1263 {
1264 struct variable **new_slot;
1265 struct variable *v = *v_slot;
1266
1267 /* If this is a per-target variable and it hasn't been touched
1268 already then look up the global version and take its export
1269 value. */
1270 if (v->per_target && v->export == v_default)
1271 {
1272 struct variable *gv;
1273
1274 gv = lookup_variable_in_set (v->name, strlen(v->name),
1275 &global_variable_set);
1276 if (gv)
1277 v->export = gv->export;
1278 }
1279
1280 switch (v->export)
1281 {
1282 case v_default:
1283 if (v->origin == o_default || v->origin == o_automatic)
1284 /* Only export default variables by explicit request. */
1285 continue;
1286
1287 /* The variable doesn't have a name that can be exported. */
1288 if (! v->exportable)
1289 continue;
1290
1291 if (! export_all_variables
1292 && v->origin != o_command
1293 && v->origin != o_env && v->origin != o_env_override)
1294 continue;
1295 break;
1296
1297 case v_export:
1298 break;
1299
1300 case v_noexport:
1301 /* If this is the SHELL variable and it's not exported, then
1302 add the value from our original environment. */
1303 if (streq (v->name, "SHELL"))
1304 {
1305 extern struct variable shell_var;
1306 v = &shell_var;
1307 break;
1308 }
1309 continue;
1310
1311 case v_ifset:
1312 if (v->origin == o_default)
1313 continue;
1314 break;
1315 }
1316
1317 new_slot = (struct variable **) hash_find_slot (&table, v);
1318 if (HASH_VACANT (*new_slot))
1319 hash_insert_at (&table, v, new_slot);
1320 }
1321 }
1322
1323 makelevel_key.name = MAKELEVEL_NAME;
1324 makelevel_key.length = MAKELEVEL_LENGTH;
1325#ifdef VARIABLE_HASH /* bird */
1326 makelevel_key.hash1 = variable_hash_1i (MAKELEVEL_NAME, MAKELEVEL_LENGTH);
1327 makelevel_key.hash2 = 0;
1328#endif
1329 hash_delete (&table, &makelevel_key);
1330
1331 result = result_0 = xmalloc ((table.ht_fill + 2) * sizeof (char *));
1332
1333 v_slot = (struct variable **) table.ht_vec;
1334 v_end = v_slot + table.ht_size;
1335 for ( ; v_slot < v_end; v_slot++)
1336 if (! HASH_VACANT (*v_slot))
1337 {
1338 struct variable *v = *v_slot;
1339
1340 /* If V is recursively expanded and didn't come from the environment,
1341 expand its value. If it came from the environment, it should
1342 go back into the environment unchanged. */
1343 if (v->recursive
1344 && v->origin != o_env && v->origin != o_env_override)
1345 {
1346 char *value = recursively_expand_for_file (v, file);
1347#ifdef WINDOWS32
1348 if (strcmp(v->name, "Path") == 0 ||
1349 strcmp(v->name, "PATH") == 0)
1350 convert_Path_to_windows32(value, ';');
1351#endif
1352 *result++ = xstrdup (concat (v->name, "=", value));
1353 free (value);
1354 }
1355 else
1356 {
1357#ifdef WINDOWS32
1358 if (strcmp(v->name, "Path") == 0 ||
1359 strcmp(v->name, "PATH") == 0)
1360 convert_Path_to_windows32(v->value, ';');
1361#endif
1362 *result++ = xstrdup (concat (v->name, "=", v->value));
1363 }
1364 }
1365
1366 *result = xmalloc (100);
1367 sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1);
1368 *++result = 0;
1369
1370 hash_free (&table, 0);
1371
1372 return result_0;
1373}
1374
1375
1376#ifdef CONFIG_WITH_VALUE_LENGTH
1377static struct variable *
1378do_variable_definition_append (const struct floc *flocp, struct variable *v, const char *value,
1379 enum variable_origin origin, int append)
1380{
1381 if (env_overrides && origin == o_env)
1382 origin = o_env_override;
1383
1384 if (env_overrides && v->origin == o_env)
1385 /* V came from in the environment. Since it was defined
1386 before the switches were parsed, it wasn't affected by -e. */
1387 v->origin = o_env_override;
1388
1389 /* A variable of this name is already defined.
1390 If the old definition is from a stronger source
1391 than this one, don't redefine it. */
1392 if ((int) origin < (int) v->origin)
1393 return v;
1394 v->origin = origin;
1395
1396 /* location */
1397 if (flocp != 0)
1398 v->fileinfo = *flocp;
1399
1400 /* The juicy bits, append the specified value to the variable
1401 This is a heavily exercised code path in kBuild. */
1402 if (v->recursive)
1403 {
1404 /* The previous definition of the variable was recursive.
1405 The new value is the unexpanded old and new values. */
1406 unsigned int value_len = strlen (value);
1407 unsigned int new_value_len = value_len + (v->value_length != 0 ? 1 + v->value_length : 0);
1408 int done_1st_prepend_copy = 0;
1409
1410 /* adjust the size. */
1411 if ((unsigned)v->value_alloc_len <= new_value_len)
1412 {
1413 v->value_alloc_len *= 2;
1414 if (v->value_alloc_len < new_value_len)
1415 v->value_alloc_len = (new_value_len + value_len + 0x7f) + ~0x7fU;
1416 if (append || !v->value_length)
1417 v->value = xrealloc (v->value, v->value_alloc_len);
1418 else
1419 {
1420 /* avoid the extra memcpy the xrealloc may have to do */
1421 char *new_buf = xmalloc (v->value_alloc_len);
1422 memcpy (&new_buf[value_len + 1], v->value, v->value_length + 1);
1423 done_1st_prepend_copy = 1;
1424 free (v->value);
1425 v->value = new_buf;
1426 }
1427 }
1428
1429 /* insert the new bits */
1430 if (v->value_length != 0)
1431 {
1432 if (append)
1433 {
1434 v->value[v->value_length] = ' ';
1435 memcpy (&v->value[v->value_length + 1], value, value_len + 1);
1436 }
1437 else
1438 {
1439 if (!done_1st_prepend_copy)
1440 memmove (&v->value[value_len + 1], v->value, v->value_length + 1);
1441 v->value[value_len] = ' ';
1442 memcpy (v->value, value, value_len);
1443 }
1444 }
1445 else
1446 memcpy (v->value, value, value_len + 1);
1447 v->value_length = new_value_len;
1448 }
1449 else
1450 {
1451 /* The previous definition of the variable was simple.
1452 The new value comes from the old value, which was expanded
1453 when it was set; and from the expanded new value. */
1454 append_expanded_string_to_variable(v, value);
1455 }
1456
1457 /* update the variable */
1458 return v;
1459}
1460#endif /* CONFIG_WITH_VALUE_LENGTH */
1461
1462
1463/* Given a variable, a value, and a flavor, define the variable.
1464 See the try_variable_definition() function for details on the parameters. */
1465
1466struct variable *
1467do_variable_definition (const struct floc *flocp, const char *varname,
1468 const char *value, enum variable_origin origin,
1469 enum variable_flavor flavor, int target_var)
1470{
1471 const char *p;
1472 char *alloc_value = NULL;
1473 struct variable *v;
1474 int append = 0;
1475 int conditional = 0;
1476 const size_t varname_len = strlen (varname); /* bird */
1477#ifdef CONFIG_WITH_VALUE_LENGTH
1478 unsigned int value_len = ~0U;
1479#endif
1480
1481 /* Calculate the variable's new value in VALUE. */
1482
1483 switch (flavor)
1484 {
1485 default:
1486 case f_bogus:
1487 /* Should not be possible. */
1488 abort ();
1489 case f_simple:
1490 /* A simple variable definition "var := value". Expand the value.
1491 We have to allocate memory since otherwise it'll clobber the
1492 variable buffer, and we may still need that if we're looking at a
1493 target-specific variable. */
1494 p = alloc_value = allocated_variable_expand (value);
1495 break;
1496 case f_conditional:
1497 /* A conditional variable definition "var ?= value".
1498 The value is set IFF the variable is not defined yet. */
1499 v = lookup_variable (varname, varname_len);
1500 if (v)
1501 return v;
1502
1503 conditional = 1;
1504 flavor = f_recursive;
1505 /* FALLTHROUGH */
1506 case f_recursive:
1507 /* A recursive variable definition "var = value".
1508 The value is used verbatim. */
1509 p = value;
1510 break;
1511#ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1512 case f_append:
1513 case f_prepend:
1514 {
1515 const enum variable_flavor org_flavor = flavor;
1516#else
1517 case f_append:
1518 {
1519#endif
1520
1521 /* If we have += but we're in a target variable context, we want to
1522 append only with other variables in the context of this target. */
1523 if (target_var)
1524 {
1525 append = 1;
1526 v = lookup_variable_in_set (varname, varname_len,
1527 current_variable_set_list->set);
1528
1529 /* Don't append from the global set if a previous non-appending
1530 target-specific variable definition exists. */
1531 if (v && !v->append)
1532 append = 0;
1533 }
1534 else
1535 v = lookup_variable (varname, varname_len);
1536
1537 if (v == 0)
1538 {
1539 /* There was no old value.
1540 This becomes a normal recursive definition. */
1541 p = value;
1542 flavor = f_recursive;
1543 }
1544 else
1545 {
1546#ifdef CONFIG_WITH_VALUE_LENGTH
1547 v->append = append;
1548# ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1549 return do_variable_definition_append (flocp, v, value, origin, org_flavor == f_append);
1550# else
1551 return do_variable_definition_append (flocp, v, value, origin, 1);
1552# endif
1553#else /* !CONFIG_WITH_VALUE_LENGTH */
1554
1555 /* Paste the old and new values together in VALUE. */
1556
1557 unsigned int oldlen, vallen;
1558 const char *val;
1559 char *tp;
1560
1561 val = value;
1562 if (v->recursive)
1563 /* The previous definition of the variable was recursive.
1564 The new value is the unexpanded old and new values. */
1565 flavor = f_recursive;
1566 else
1567 /* The previous definition of the variable was simple.
1568 The new value comes from the old value, which was expanded
1569 when it was set; and from the expanded new value. Allocate
1570 memory for the expansion as we may still need the rest of the
1571 buffer if we're looking at a target-specific variable. */
1572 val = alloc_value = allocated_variable_expand (val);
1573
1574 oldlen = strlen (v->value);
1575 vallen = strlen (val);
1576 tp = alloca (oldlen + 1 + vallen + 1);
1577# ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1578 if (org_flavor == f_prepend)
1579 {
1580 memcpy (tp, val, vallen);
1581 tp[oldlen] = ' ';
1582 memcpy (&tp[oldlen + 1], v->value, oldlen + 1);
1583 }
1584 else
1585# endif /* CONFIG_WITH_PREPEND_ASSIGNMENT */
1586 {
1587 memcpy (tp, v->value, oldlen);
1588 tp[oldlen] = ' ';
1589 memcpy (&tp[oldlen + 1], val, vallen + 1);
1590 }
1591 p = tp;
1592#endif /* !CONFIG_WITH_VALUE_LENGTH */
1593 }
1594 }
1595 }
1596
1597#ifdef __MSDOS__
1598 /* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1599 non-Unix systems don't conform to this default configuration (in
1600 fact, most of them don't even have `/bin'). On the other hand,
1601 $SHELL in the environment, if set, points to the real pathname of
1602 the shell.
1603 Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1604 the Makefile override $SHELL from the environment. But first, we
1605 look for the basename of the shell in the directory where SHELL=
1606 points, and along the $PATH; if it is found in any of these places,
1607 we define $SHELL to be the actual pathname of the shell. Thus, if
1608 you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1609 your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1610 defining SHELL to be "d:/unix/bash.exe". */
1611 if ((origin == o_file || origin == o_override)
1612 && strcmp (varname, "SHELL") == 0)
1613 {
1614 PATH_VAR (shellpath);
1615 extern char * __dosexec_find_on_path (const char *, char *[], char *);
1616
1617 /* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1618 if (__dosexec_find_on_path (p, NULL, shellpath))
1619 {
1620 char *tp;
1621
1622 for (tp = shellpath; *tp; tp++)
1623 if (*tp == '\\')
1624 *tp = '/';
1625
1626 v = define_variable_loc (varname, varname_len,
1627 shellpath, origin, flavor == f_recursive,
1628 flocp);
1629 }
1630 else
1631 {
1632 const char *shellbase, *bslash;
1633 struct variable *pathv = lookup_variable ("PATH", 4);
1634 char *path_string;
1635 char *fake_env[2];
1636 size_t pathlen = 0;
1637
1638 shellbase = strrchr (p, '/');
1639 bslash = strrchr (p, '\\');
1640 if (!shellbase || bslash > shellbase)
1641 shellbase = bslash;
1642 if (!shellbase && p[1] == ':')
1643 shellbase = p + 1;
1644 if (shellbase)
1645 shellbase++;
1646 else
1647 shellbase = p;
1648
1649 /* Search for the basename of the shell (with standard
1650 executable extensions) along the $PATH. */
1651 if (pathv)
1652 pathlen = strlen (pathv->value);
1653 path_string = xmalloc (5 + pathlen + 2 + 1);
1654 /* On MSDOS, current directory is considered as part of $PATH. */
1655 sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1656 fake_env[0] = path_string;
1657 fake_env[1] = 0;
1658 if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1659 {
1660 char *tp;
1661
1662 for (tp = shellpath; *tp; tp++)
1663 if (*tp == '\\')
1664 *tp = '/';
1665
1666 v = define_variable_loc (varname, varname_len,
1667 shellpath, origin,
1668 flavor == f_recursive, flocp);
1669 }
1670 else
1671 v = lookup_variable (varname, varname_len);
1672
1673 free (path_string);
1674 }
1675 }
1676 else
1677#endif /* __MSDOS__ */
1678#ifdef WINDOWS32
1679 if ( varname_len == sizeof("SHELL") - 1 /* bird */
1680 && (origin == o_file || origin == o_override || origin == o_command)
1681 && streq (varname, "SHELL"))
1682 {
1683 extern char *default_shell;
1684
1685 /* Call shell locator function. If it returns TRUE, then
1686 set no_default_sh_exe to indicate sh was found and
1687 set new value for SHELL variable. */
1688
1689 if (find_and_set_default_shell (p))
1690 {
1691 v = define_variable_in_set (varname, varname_len, default_shell,
1692# ifdef CONFIG_WITH_VALUE_LENGTH
1693 ~0U, 1 /* duplicate_value */,
1694# endif
1695 origin, flavor == f_recursive,
1696 (target_var
1697 ? current_variable_set_list->set
1698 : NULL),
1699 flocp);
1700 no_default_sh_exe = 0;
1701 }
1702 else
1703 v = lookup_variable (varname, varname_len);
1704# ifdef CONFIG_WITH_VALUE_LENGTH
1705 if (alloc_value)
1706 free (alloc_value);
1707# endif
1708 }
1709 else
1710#endif
1711
1712 /* If we are defining variables inside an $(eval ...), we might have a
1713 different variable context pushed, not the global context (maybe we're
1714 inside a $(call ...) or something. Since this function is only ever
1715 invoked in places where we want to define globally visible variables,
1716 make sure we define this variable in the global set. */
1717
1718 v = define_variable_in_set (varname, varname_len, p,
1719#ifdef CONFIG_WITH_VALUE_LENGTH
1720 value_len, !alloc_value,
1721#endif
1722 origin, flavor == f_recursive,
1723 (target_var
1724 ? current_variable_set_list->set : NULL),
1725 flocp);
1726 v->append = append;
1727 v->conditional = conditional;
1728
1729#ifndef CONFIG_WITH_VALUE_LENGTH
1730 if (alloc_value)
1731 free (alloc_value);
1732#endif
1733
1734 return v;
1735}
1736
1737
1738/* Try to interpret LINE (a null-terminated string) as a variable definition.
1739
1740 ORIGIN may be o_file, o_override, o_env, o_env_override,
1741 or o_command specifying that the variable definition comes
1742 from a makefile, an override directive, the environment with
1743 or without the -e switch, or the command line.
1744
1745 See the comments for parse_variable_definition().
1746
1747 If LINE was recognized as a variable definition, a pointer to its `struct
1748 variable' is returned. If LINE is not a variable definition, NULL is
1749 returned. */
1750
1751struct variable *
1752parse_variable_definition (struct variable *v, char *line)
1753{
1754 register int c;
1755 register char *p = line;
1756 register char *beg;
1757 register char *end;
1758 enum variable_flavor flavor = f_bogus;
1759 char *name;
1760
1761 while (1)
1762 {
1763 c = *p++;
1764 if (c == '\0' || c == '#')
1765 return 0;
1766 if (c == '=')
1767 {
1768 end = p - 1;
1769 flavor = f_recursive;
1770 break;
1771 }
1772 else if (c == ':')
1773 if (*p == '=')
1774 {
1775 end = p++ - 1;
1776 flavor = f_simple;
1777 break;
1778 }
1779 else
1780 /* A colon other than := is a rule line, not a variable defn. */
1781 return 0;
1782 else if (c == '+' && *p == '=')
1783 {
1784 end = p++ - 1;
1785 flavor = f_append;
1786 break;
1787 }
1788#ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1789 else if (c == '<' && *p == '=')
1790 {
1791 end = p++ - 1;
1792 flavor = f_prepend;
1793 break;
1794 }
1795#endif
1796 else if (c == '?' && *p == '=')
1797 {
1798 end = p++ - 1;
1799 flavor = f_conditional;
1800 break;
1801 }
1802 else if (c == '$')
1803 {
1804 /* This might begin a variable expansion reference. Make sure we
1805 don't misrecognize chars inside the reference as =, := or +=. */
1806 char closeparen;
1807 int count;
1808 c = *p++;
1809 if (c == '(')
1810 closeparen = ')';
1811 else if (c == '{')
1812 closeparen = '}';
1813 else
1814 continue; /* Nope. */
1815
1816 /* P now points past the opening paren or brace.
1817 Count parens or braces until it is matched. */
1818 count = 0;
1819 for (; *p != '\0'; ++p)
1820 {
1821 if (*p == c)
1822 ++count;
1823 else if (*p == closeparen && --count < 0)
1824 {
1825 ++p;
1826 break;
1827 }
1828 }
1829 }
1830 }
1831 v->flavor = flavor;
1832
1833 beg = next_token (line);
1834 while (end > beg && isblank ((unsigned char)end[-1]))
1835 --end;
1836 p = next_token (p);
1837 v->value = p;
1838#ifdef CONFIG_WITH_VALUE_LENGTH
1839 v->value_length = v->value_alloc_len = -1;
1840#endif
1841
1842 /* Expand the name, so "$(foo)bar = baz" works. */
1843 name = alloca (end - beg + 1);
1844 memcpy (name, beg, end - beg);
1845 name[end - beg] = '\0';
1846 v->name = allocated_variable_expand (name);
1847
1848 if (v->name[0] == '\0')
1849 fatal (&v->fileinfo, _("empty variable name"));
1850
1851 return v;
1852}
1853
1854
1855/* Try to interpret LINE (a null-terminated string) as a variable definition.
1856
1857 ORIGIN may be o_file, o_override, o_env, o_env_override,
1858 or o_command specifying that the variable definition comes
1859 from a makefile, an override directive, the environment with
1860 or without the -e switch, or the command line.
1861
1862 See the comments for parse_variable_definition().
1863
1864 If LINE was recognized as a variable definition, a pointer to its `struct
1865 variable' is returned. If LINE is not a variable definition, NULL is
1866 returned. */
1867
1868struct variable *
1869try_variable_definition (const struct floc *flocp, char *line,
1870 enum variable_origin origin, int target_var)
1871{
1872 struct variable v;
1873 struct variable *vp;
1874
1875 if (flocp != 0)
1876 v.fileinfo = *flocp;
1877 else
1878 v.fileinfo.filenm = 0;
1879
1880 if (!parse_variable_definition (&v, line))
1881 return 0;
1882
1883 vp = do_variable_definition (flocp, v.name, v.value,
1884 origin, v.flavor, target_var);
1885
1886 free (v.name);
1887
1888 return vp;
1889}
1890
1891
1892/* Print information for variable V, prefixing it with PREFIX. */
1893
1894static void
1895print_variable (const void *item, void *arg)
1896{
1897 const struct variable *v = item;
1898 const char *prefix = arg;
1899 const char *origin;
1900
1901 switch (v->origin)
1902 {
1903 case o_default:
1904 origin = _("default");
1905 break;
1906 case o_env:
1907 origin = _("environment");
1908 break;
1909 case o_file:
1910 origin = _("makefile");
1911 break;
1912 case o_env_override:
1913 origin = _("environment under -e");
1914 break;
1915 case o_command:
1916 origin = _("command line");
1917 break;
1918 case o_override:
1919 origin = _("`override' directive");
1920 break;
1921 case o_automatic:
1922 origin = _("automatic");
1923 break;
1924 case o_invalid:
1925 default:
1926 abort ();
1927 }
1928 fputs ("# ", stdout);
1929 fputs (origin, stdout);
1930 if (v->fileinfo.filenm)
1931 printf (_(" (from `%s', line %lu)"),
1932 v->fileinfo.filenm, v->fileinfo.lineno);
1933 putchar ('\n');
1934 fputs (prefix, stdout);
1935
1936 /* Is this a `define'? */
1937 if (v->recursive && strchr (v->value, '\n') != 0)
1938 printf ("define %s\n%s\nendef\n", v->name, v->value);
1939 else
1940 {
1941 register char *p;
1942
1943 printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1944
1945 /* Check if the value is just whitespace. */
1946 p = next_token (v->value);
1947 if (p != v->value && *p == '\0')
1948 /* All whitespace. */
1949 printf ("$(subst ,,%s)", v->value);
1950 else if (v->recursive)
1951 fputs (v->value, stdout);
1952 else
1953 /* Double up dollar signs. */
1954 for (p = v->value; *p != '\0'; ++p)
1955 {
1956 if (*p == '$')
1957 putchar ('$');
1958 putchar (*p);
1959 }
1960 putchar ('\n');
1961 }
1962}
1963
1964
1965/* Print all the variables in SET. PREFIX is printed before
1966 the actual variable definitions (everything else is comments). */
1967
1968void
1969print_variable_set (struct variable_set *set, char *prefix)
1970{
1971 hash_map_arg (&set->table, print_variable, prefix);
1972
1973 fputs (_("# variable set hash-table stats:\n"), stdout);
1974 fputs ("# ", stdout);
1975 hash_print_stats (&set->table, stdout);
1976 putc ('\n', stdout);
1977}
1978
1979/* Print the data base of variables. */
1980
1981void
1982print_variable_data_base (void)
1983{
1984 puts (_("\n# Variables\n"));
1985
1986 print_variable_set (&global_variable_set, "");
1987
1988 puts (_("\n# Pattern-specific Variable Values"));
1989
1990 {
1991 struct pattern_var *p;
1992 int rules = 0;
1993
1994 for (p = pattern_vars; p != 0; p = p->next)
1995 {
1996 ++rules;
1997 printf ("\n%s :\n", p->target);
1998 print_variable (&p->variable, "# ");
1999 }
2000
2001 if (rules == 0)
2002 puts (_("\n# No pattern-specific variable values."));
2003 else
2004 printf (_("\n# %u pattern-specific variable values"), rules);
2005 }
2006}
2007
2008
2009/* Print all the local variables of FILE. */
2010
2011void
2012print_file_variables (const struct file *file)
2013{
2014 if (file->variables != 0)
2015 print_variable_set (file->variables->set, "# ");
2016}
2017
2018#ifdef WINDOWS32
2019void
2020sync_Path_environment (void)
2021{
2022 char *path = allocated_variable_expand ("$(PATH)");
2023 static char *environ_path = NULL;
2024
2025 if (!path)
2026 return;
2027
2028 /*
2029 * If done this before, don't leak memory unnecessarily.
2030 * Free the previous entry before allocating new one.
2031 */
2032 if (environ_path)
2033 free (environ_path);
2034
2035 /*
2036 * Create something WINDOWS32 world can grok
2037 */
2038 convert_Path_to_windows32 (path, ';');
2039 environ_path = xstrdup (concat ("PATH", "=", path));
2040 putenv (environ_path);
2041 free (path);
2042}
2043#endif
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