variable.c@ 1169

Last change on this file since 1169 was 1162, checked in by bird, 17 years ago
Made kDepIDB into an builtin command to try speed up windows...
Property svn:eol-style set to `native`
File size: 61.2 KB

Line
1	/* Internals of variables for GNU Make.
2	Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
3	1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
4	Foundation, Inc.
5	This file is part of GNU Make.
6
7	GNU Make is free software; you can redistribute it and/or modify it under the
8	terms of the GNU General Public License as published by the Free Software
9	Foundation; either version 2, or (at your option) any later version.
10
11	GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
12	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
13	A PARTICULAR PURPOSE. See the GNU General Public License for more details.
14
15	You should have received a copy of the GNU General Public License along with
16	GNU Make; see the file COPYING. If not, write to the Free Software
17	Foundation, 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
39	static struct pattern_var *pattern_vars;
40
41	/* Pointer to last struct in the chain, so we can add onto the end. */
42
43	static struct pattern_var *last_pattern_var;
44
45	/* Create a new pattern-specific variable struct. */
46
47	struct pattern_var *
48	create_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
68	static struct pattern_var *
69	lookup_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
111	typedef signed int int32_t;
112	typedef signed short int int16_t;
113	# endif
114	static 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
143	static 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
162	static unsigned long
163	variable_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
183	static unsigned long
184	variable_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
201	static int
202	variable_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
295	static struct variable_set global_variable_set;
296	static struct variable_set_list global_setlist
297	= { 0, &global_variable_set };
298	struct variable_set_list *current_variable_set_list = &global_setlist;
299
300
301	/* Implement variables. */
302
303	void
304	init_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
318	struct variable *
319	define_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
324	struct variable *
325	define_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
472	static struct variable *
473	handle_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
557	struct variable *
558	lookup_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
678	struct variable *
679	lookup_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
704	void
705	initialize_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
803	struct variable_set_list *
804	create_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
821	static void
822	free_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
829	void
830	free_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
844	struct variable_set_list *
845	push_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
863	void
864	pop_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
900	static void
901	merge_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
926	void
927	merge_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
964	void
965	define_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 (CONFIG_WITH_DATE) \
1040	&& defined (CONFIG_WITH_FILE_SIZE) \
1041	&& defined (KMK_HELPERS)
1042	(void) define_variable ("KMK_FEATURES", 12,
1043	"append-dash-n abspath"
1044	" rsort"
1045	" abspathex"
1046	" toupper tolower"
1047	" comp-vars comp-cmds"
1048	" stack"
1049	" math-int"
1050	" xargs"
1051	" explicit-multitarget"
1052	" prepend-assignment"
1053	" set-conditionals"
1054	" date"
1055	" file-size"
1056	" kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one "
1057	, o_default, 0);
1058	# else /* MSC can't deal with strings mixed with #if/#endif, thus the slow way. */
1059	# error "All features should be enabled by default!"
1060	strcpy (buf, "append-dash-n abspath");
1061	# if defined (CONFIG_WITH_RSORT)
1062	strcat (buf, " rsort");
1063	# endif
1064	# if defined (CONFIG_WITH_ABSPATHEX)
1065	strcat (buf, " abspathex");
1066	# endif
1067	# if defined (CONFIG_WITH_TOUPPER_TOLOWER)
1068	strcat (buf, " toupper tolower");
1069	# endif
1070	# if defined (CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE)
1071	strcat (buf, " comp-vars comp-cmds");
1072	# endif
1073	# if defined (CONFIG_WITH_STACK)
1074	strcat (buf, " stack");
1075	# endif
1076	# if defined (CONFIG_WITH_MATH)
1077	strcat (buf, " math-int");
1078	# endif
1079	# if defined (CONFIG_WITH_XARGS)
1080	strcat (buf, " xargs");
1081	# endif
1082	# if defined (CONFIG_WITH_EXPLICIT_MULTITARGET)
1083	strcat (buf, " explicit-multitarget");
1084	# endif
1085	# if defined (CONFIG_WITH_PREPEND_ASSIGNMENT)
1086	strcat (buf, " prepend-assignment");
1087	# endif
1088	# if defined (CONFIG_WITH_SET_CONDITIONALS)
1089	strcat (buf, " set-conditionals");
1090	# endif
1091	# if defined (CONFIG_WITH_DATE)
1092	strcat (buf, " date");
1093	# endif
1094	# if defined (CONFIG_WITH_FILE_SIZE)
1095	strcat (buf, " file-size");
1096	# endif
1097	# if defined (KMK_HELPERS)
1098	strcat (buf, " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one");
1099	# endif
1100	(void) define_variable ("KMK_FEATURES", 12, buf, o_default, 0);
1101	# endif
1102
1103	#endif /* KMK */
1104
1105	#ifdef CONFIG_WITH_KMK_BUILTIN
1106	/* The supported kMk Builtin commands. */
1107	(void) define_variable ("KMK_BUILTIN", 11, "append cat cp cmp echo install kDepIDB ln md5sum mkdir mv printf rm rmdir", o_default, 0);
1108	#endif
1109
1110	#ifdef __MSDOS__
1111	/* Allow to specify a special shell just for Make,
1112	and use $COMSPEC as the default $SHELL when appropriate. */
1113	{
1114	static char shell_str[] = "SHELL";
1115	const int shlen = sizeof (shell_str) - 1;
1116	struct variable *mshp = lookup_variable ("MAKESHELL", 9);
1117	struct variable *comp = lookup_variable ("COMSPEC", 7);
1118
1119	/* Make $MAKESHELL override $SHELL even if -e is in effect. */
1120	if (mshp)
1121	(void) define_variable (shell_str, shlen,
1122	mshp->value, o_env_override, 0);
1123	else if (comp)
1124	{
1125	/* $COMSPEC shouldn't override $SHELL. */
1126	struct variable *shp = lookup_variable (shell_str, shlen);
1127
1128	if (!shp)
1129	(void) define_variable (shell_str, shlen, comp->value, o_env, 0);
1130	}
1131	}
1132	#elif defined(__EMX__)
1133	{
1134	static char shell_str[] = "SHELL";
1135	const int shlen = sizeof (shell_str) - 1;
1136	struct variable *shell = lookup_variable (shell_str, shlen);
1137	struct variable *replace = lookup_variable ("MAKESHELL", 9);
1138
1139	/* if $MAKESHELL is defined in the environment assume o_env_override */
1140	if (replace && *replace->value && replace->origin == o_env)
1141	replace->origin = o_env_override;
1142
1143	/* if $MAKESHELL is not defined use $SHELL but only if the variable
1144	did not come from the environment */
1145	if (!replace \|\| !*replace->value)
1146	if (shell && *shell->value && (shell->origin == o_env
1147	\|\| shell->origin == o_env_override))
1148	{
1149	/* overwrite whatever we got from the environment */
1150	free(shell->value);
1151	shell->value = xstrdup (default_shell);
1152	shell->origin = o_default;
1153	}
1154
1155	/* Some people do not like cmd to be used as the default
1156	if $SHELL is not defined in the Makefile.
1157	With -DNO_CMD_DEFAULT you can turn off this behaviour */
1158	# ifndef NO_CMD_DEFAULT
1159	/* otherwise use $COMSPEC */
1160	if (!replace \|\| !*replace->value)
1161	replace = lookup_variable ("COMSPEC", 7);
1162
1163	/* otherwise use $OS2_SHELL */
1164	if (!replace \|\| !*replace->value)
1165	replace = lookup_variable ("OS2_SHELL", 9);
1166	# else
1167	# warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell
1168	# endif
1169
1170	if (replace && *replace->value)
1171	/* overwrite $SHELL */
1172	(void) define_variable (shell_str, shlen, replace->value,
1173	replace->origin, 0);
1174	else
1175	/* provide a definition if there is none */
1176	(void) define_variable (shell_str, shlen, default_shell,
1177	o_default, 0);
1178	}
1179
1180	#endif
1181
1182	/* This won't override any definition, but it will provide one if there
1183	isn't one there. */
1184	v = define_variable ("SHELL", 5, default_shell, o_default, 0);
1185
1186	/* On MSDOS we do use SHELL from environment, since it isn't a standard
1187	environment variable on MSDOS, so whoever sets it, does that on purpose.
1188	On OS/2 we do not use SHELL from environment but we have already handled
1189	that problem above. */
1190	#if !defined(__MSDOS__) && !defined(__EMX__)
1191	/* Don't let SHELL come from the environment. */
1192	if (*v->value == '\0' \|\| v->origin == o_env \|\| v->origin == o_env_override)
1193	{
1194	free (v->value);
1195	v->origin = o_file;
1196	v->value = xstrdup (default_shell);
1197	#ifdef CONFIG_WITH_VALUE_LENGTH
1198	v->value_length = strlen (v->value);
1199	v->value_alloc_len = v->value_length + 1;
1200	#endif
1201	}
1202	#endif
1203
1204	/* Make sure MAKEFILES gets exported if it is set. */
1205	v = define_variable ("MAKEFILES", 9, "", o_default, 0);
1206	v->export = v_ifset;
1207
1208	/* Define the magic D and F variables in terms of
1209	the automatic variables they are variations of. */
1210
1211	#ifdef VMS
1212	define_variable ("@D", 2, "$(dir $@)", o_automatic, 1);
1213	define_variable ("%D", 2, "$(dir $%)", o_automatic, 1);
1214	define_variable ("D", 2, "$(dir $)", o_automatic, 1);
1215	define_variable ("<D", 2, "$(dir $<)", o_automatic, 1);
1216	define_variable ("?D", 2, "$(dir $?)", o_automatic, 1);
1217	define_variable ("^D", 2, "$(dir $^)", o_automatic, 1);
1218	define_variable ("+D", 2, "$(dir $+)", o_automatic, 1);
1219	#else
1220	define_variable ("@D", 2, "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
1221	define_variable ("%D", 2, "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
1222	define_variable ("D", 2, "$(patsubst %/,%,$(dir $))", o_automatic, 1);
1223	define_variable ("<D", 2, "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
1224	define_variable ("?D", 2, "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
1225	define_variable ("^D", 2, "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
1226	define_variable ("+D", 2, "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
1227	#endif
1228	define_variable ("@F", 2, "$(notdir $@)", o_automatic, 1);
1229	define_variable ("%F", 2, "$(notdir $%)", o_automatic, 1);
1230	define_variable ("F", 2, "$(notdir $)", o_automatic, 1);
1231	define_variable ("<F", 2, "$(notdir $<)", o_automatic, 1);
1232	define_variable ("?F", 2, "$(notdir $?)", o_automatic, 1);
1233	define_variable ("^F", 2, "$(notdir $^)", o_automatic, 1);
1234	define_variable ("+F", 2, "$(notdir $+)", o_automatic, 1);
1235	}
1236
1237
1238	int export_all_variables;
1239
1240	/* Create a new environment for FILE's commands.
1241	If FILE is nil, this is for the `shell' function.
1242	The child's MAKELEVEL variable is incremented. */
1243
1244	char **
1245	target_environment (struct file *file)
1246	{
1247	struct variable_set_list *set_list;
1248	register struct variable_set_list *s;
1249	struct hash_table table;
1250	struct variable **v_slot;
1251	struct variable **v_end;
1252	struct variable makelevel_key;
1253	char **result_0;
1254	char **result;
1255
1256	if (file == 0)
1257	set_list = current_variable_set_list;
1258	else
1259	set_list = file->variables;
1260
1261	hash_init (&table, VARIABLE_BUCKETS,
1262	variable_hash_1, variable_hash_2, variable_hash_cmp);
1263
1264	/* Run through all the variable sets in the list,
1265	accumulating variables in TABLE. */
1266	for (s = set_list; s != 0; s = s->next)
1267	{
1268	struct variable_set *set = s->set;
1269	v_slot = (struct variable **) set->table.ht_vec;
1270	v_end = v_slot + set->table.ht_size;
1271	for ( ; v_slot < v_end; v_slot++)
1272	if (! HASH_VACANT (*v_slot))
1273	{
1274	struct variable **new_slot;
1275	struct variable v = v_slot;
1276
1277	/* If this is a per-target variable and it hasn't been touched
1278	already then look up the global version and take its export
1279	value. */
1280	if (v->per_target && v->export == v_default)
1281	{
1282	struct variable *gv;
1283
1284	gv = lookup_variable_in_set (v->name, strlen(v->name),
1285	&global_variable_set);
1286	if (gv)
1287	v->export = gv->export;
1288	}
1289
1290	switch (v->export)
1291	{
1292	case v_default:
1293	if (v->origin == o_default \|\| v->origin == o_automatic)
1294	/* Only export default variables by explicit request. */
1295	continue;
1296
1297	/* The variable doesn't have a name that can be exported. */
1298	if (! v->exportable)
1299	continue;
1300
1301	if (! export_all_variables
1302	&& v->origin != o_command
1303	&& v->origin != o_env && v->origin != o_env_override)
1304	continue;
1305	break;
1306
1307	case v_export:
1308	break;
1309
1310	case v_noexport:
1311	/* If this is the SHELL variable and it's not exported, then
1312	add the value from our original environment. */
1313	if (streq (v->name, "SHELL"))
1314	{
1315	extern struct variable shell_var;
1316	v = &shell_var;
1317	break;
1318	}
1319	continue;
1320
1321	case v_ifset:
1322	if (v->origin == o_default)
1323	continue;
1324	break;
1325	}
1326
1327	new_slot = (struct variable **) hash_find_slot (&table, v);
1328	if (HASH_VACANT (*new_slot))
1329	hash_insert_at (&table, v, new_slot);
1330	}
1331	}
1332
1333	makelevel_key.name = MAKELEVEL_NAME;
1334	makelevel_key.length = MAKELEVEL_LENGTH;
1335	#ifdef VARIABLE_HASH /* bird */
1336	makelevel_key.hash1 = variable_hash_1i (MAKELEVEL_NAME, MAKELEVEL_LENGTH);
1337	makelevel_key.hash2 = 0;
1338	#endif
1339	hash_delete (&table, &makelevel_key);
1340
1341	result = result_0 = xmalloc ((table.ht_fill + 2) * sizeof (char *));
1342
1343	v_slot = (struct variable **) table.ht_vec;
1344	v_end = v_slot + table.ht_size;
1345	for ( ; v_slot < v_end; v_slot++)
1346	if (! HASH_VACANT (*v_slot))
1347	{
1348	struct variable v = v_slot;
1349
1350	/* If V is recursively expanded and didn't come from the environment,
1351	expand its value. If it came from the environment, it should
1352	go back into the environment unchanged. */
1353	if (v->recursive
1354	&& v->origin != o_env && v->origin != o_env_override)
1355	{
1356	char *value = recursively_expand_for_file (v, file);
1357	#ifdef WINDOWS32
1358	if (strcmp(v->name, "Path") == 0 \|\|
1359	strcmp(v->name, "PATH") == 0)
1360	convert_Path_to_windows32(value, ';');
1361	#endif
1362	*result++ = xstrdup (concat (v->name, "=", value));
1363	free (value);
1364	}
1365	else
1366	{
1367	#ifdef WINDOWS32
1368	if (strcmp(v->name, "Path") == 0 \|\|
1369	strcmp(v->name, "PATH") == 0)
1370	convert_Path_to_windows32(v->value, ';');
1371	#endif
1372	*result++ = xstrdup (concat (v->name, "=", v->value));
1373	}
1374	}
1375
1376	*result = xmalloc (100);
1377	sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1);
1378	*++result = 0;
1379
1380	hash_free (&table, 0);
1381
1382	return result_0;
1383	}
1384
1385
1386	#ifdef CONFIG_WITH_VALUE_LENGTH
1387	static struct variable *
1388	do_variable_definition_append (const struct floc flocp, struct variable v, const char *value,
1389	enum variable_origin origin, int append)
1390	{
1391	if (env_overrides && origin == o_env)
1392	origin = o_env_override;
1393
1394	if (env_overrides && v->origin == o_env)
1395	/* V came from in the environment. Since it was defined
1396	before the switches were parsed, it wasn't affected by -e. */
1397	v->origin = o_env_override;
1398
1399	/* A variable of this name is already defined.
1400	If the old definition is from a stronger source
1401	than this one, don't redefine it. */
1402	if ((int) origin < (int) v->origin)
1403	return v;
1404	v->origin = origin;
1405
1406	/* location */
1407	if (flocp != 0)
1408	v->fileinfo = *flocp;
1409
1410	/* The juicy bits, append the specified value to the variable
1411	This is a heavily exercised code path in kBuild. */
1412	if (v->recursive)
1413	{
1414	/* The previous definition of the variable was recursive.
1415	The new value is the unexpanded old and new values. */
1416	unsigned int value_len = strlen (value);
1417	unsigned int new_value_len = value_len + (v->value_length != 0 ? 1 + v->value_length : 0);
1418	int done_1st_prepend_copy = 0;
1419
1420	/* adjust the size. */
1421	if ((unsigned)v->value_alloc_len <= new_value_len + 1)
1422	{
1423	v->value_alloc_len *= 2;
1424	if (v->value_alloc_len < new_value_len + 1)
1425	v->value_alloc_len = (new_value_len + 1 + value_len + 0x7f) + ~0x7fU;
1426	if (append \|\| !v->value_length)
1427	v->value = xrealloc (v->value, v->value_alloc_len);
1428	else
1429	{
1430	/* avoid the extra memcpy the xrealloc may have to do */
1431	char *new_buf = xmalloc (v->value_alloc_len);
1432	memcpy (&new_buf[value_len + 1], v->value, v->value_length + 1);
1433	done_1st_prepend_copy = 1;
1434	free (v->value);
1435	v->value = new_buf;
1436	}
1437	}
1438
1439	/* insert the new bits */
1440	if (v->value_length != 0)
1441	{
1442	if (append)
1443	{
1444	v->value[v->value_length] = ' ';
1445	memcpy (&v->value[v->value_length + 1], value, value_len + 1);
1446	}
1447	else
1448	{
1449	if (!done_1st_prepend_copy)
1450	memmove (&v->value[value_len + 1], v->value, v->value_length + 1);
1451	v->value[value_len] = ' ';
1452	memcpy (v->value, value, value_len);
1453	}
1454	}
1455	else
1456	memcpy (v->value, value, value_len + 1);
1457	v->value_length = new_value_len;
1458	}
1459	else
1460	{
1461	/* The previous definition of the variable was simple.
1462	The new value comes from the old value, which was expanded
1463	when it was set; and from the expanded new value. */
1464	append_expanded_string_to_variable(v, value);
1465	}
1466
1467	/* update the variable */
1468	return v;
1469	}
1470	#endif /* CONFIG_WITH_VALUE_LENGTH */
1471
1472
1473	/* Given a variable, a value, and a flavor, define the variable.
1474	See the try_variable_definition() function for details on the parameters. */
1475
1476	struct variable *
1477	do_variable_definition (const struct floc flocp, const char varname,
1478	const char *value, enum variable_origin origin,
1479	enum variable_flavor flavor, int target_var)
1480	{
1481	const char *p;
1482	char *alloc_value = NULL;
1483	struct variable *v;
1484	int append = 0;
1485	int conditional = 0;
1486	const size_t varname_len = strlen (varname); /* bird */
1487	#ifdef CONFIG_WITH_VALUE_LENGTH
1488	unsigned int value_len = ~0U;
1489	#endif
1490
1491	/* Calculate the variable's new value in VALUE. */
1492
1493	switch (flavor)
1494	{
1495	default:
1496	case f_bogus:
1497	/* Should not be possible. */
1498	abort ();
1499	case f_simple:
1500	/* A simple variable definition "var := value". Expand the value.
1501	We have to allocate memory since otherwise it'll clobber the
1502	variable buffer, and we may still need that if we're looking at a
1503	target-specific variable. */
1504	p = alloc_value = allocated_variable_expand (value);
1505	break;
1506	case f_conditional:
1507	/* A conditional variable definition "var ?= value".
1508	The value is set IFF the variable is not defined yet. */
1509	v = lookup_variable (varname, varname_len);
1510	if (v)
1511	return v;
1512
1513	conditional = 1;
1514	flavor = f_recursive;
1515	/* FALLTHROUGH */
1516	case f_recursive:
1517	/* A recursive variable definition "var = value".
1518	The value is used verbatim. */
1519	p = value;
1520	break;
1521	#ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1522	case f_append:
1523	case f_prepend:
1524	{
1525	const enum variable_flavor org_flavor = flavor;
1526	#else
1527	case f_append:
1528	{
1529	#endif
1530
1531	/* If we have += but we're in a target variable context, we want to
1532	append only with other variables in the context of this target. */
1533	if (target_var)
1534	{
1535	append = 1;
1536	v = lookup_variable_in_set (varname, varname_len,
1537	current_variable_set_list->set);
1538
1539	/* Don't append from the global set if a previous non-appending
1540	target-specific variable definition exists. */
1541	if (v && !v->append)
1542	append = 0;
1543	}
1544	else
1545	v = lookup_variable (varname, varname_len);
1546
1547	if (v == 0)
1548	{
1549	/* There was no old value.
1550	This becomes a normal recursive definition. */
1551	p = value;
1552	flavor = f_recursive;
1553	}
1554	else
1555	{
1556	#ifdef CONFIG_WITH_VALUE_LENGTH
1557	v->append = append;
1558	# ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1559	return do_variable_definition_append (flocp, v, value, origin, org_flavor == f_append);
1560	# else
1561	return do_variable_definition_append (flocp, v, value, origin, 1);
1562	# endif
1563	#else /* !CONFIG_WITH_VALUE_LENGTH */
1564
1565	/* Paste the old and new values together in VALUE. */
1566
1567	unsigned int oldlen, vallen;
1568	const char *val;
1569	char *tp;
1570
1571	val = value;
1572	if (v->recursive)
1573	/* The previous definition of the variable was recursive.
1574	The new value is the unexpanded old and new values. */
1575	flavor = f_recursive;
1576	else
1577	/* The previous definition of the variable was simple.
1578	The new value comes from the old value, which was expanded
1579	when it was set; and from the expanded new value. Allocate
1580	memory for the expansion as we may still need the rest of the
1581	buffer if we're looking at a target-specific variable. */
1582	val = alloc_value = allocated_variable_expand (val);
1583
1584	oldlen = strlen (v->value);
1585	vallen = strlen (val);
1586	tp = alloca (oldlen + 1 + vallen + 1);
1587	# ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1588	if (org_flavor == f_prepend)
1589	{
1590	memcpy (tp, val, vallen);
1591	tp[oldlen] = ' ';
1592	memcpy (&tp[oldlen + 1], v->value, oldlen + 1);
1593	}
1594	else
1595	# endif /* CONFIG_WITH_PREPEND_ASSIGNMENT */
1596	{
1597	memcpy (tp, v->value, oldlen);
1598	tp[oldlen] = ' ';
1599	memcpy (&tp[oldlen + 1], val, vallen + 1);
1600	}
1601	p = tp;
1602	#endif /* !CONFIG_WITH_VALUE_LENGTH */
1603	}
1604	}
1605	}
1606
1607	#ifdef __MSDOS__
1608	/* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1609	non-Unix systems don't conform to this default configuration (in
1610	fact, most of them don't even have `/bin'). On the other hand,
1611	$SHELL in the environment, if set, points to the real pathname of
1612	the shell.
1613	Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1614	the Makefile override $SHELL from the environment. But first, we
1615	look for the basename of the shell in the directory where SHELL=
1616	points, and along the $PATH; if it is found in any of these places,
1617	we define $SHELL to be the actual pathname of the shell. Thus, if
1618	you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1619	your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1620	defining SHELL to be "d:/unix/bash.exe". */
1621	if ((origin == o_file \|\| origin == o_override)
1622	&& strcmp (varname, "SHELL") == 0)
1623	{
1624	PATH_VAR (shellpath);
1625	extern char * __dosexec_find_on_path (const char , char [], char *);
1626
1627	/* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1628	if (__dosexec_find_on_path (p, NULL, shellpath))
1629	{
1630	char *tp;
1631
1632	for (tp = shellpath; *tp; tp++)
1633	if (*tp == '\\')
1634	*tp = '/';
1635
1636	v = define_variable_loc (varname, varname_len,
1637	shellpath, origin, flavor == f_recursive,
1638	flocp);
1639	}
1640	else
1641	{
1642	const char shellbase, bslash;
1643	struct variable *pathv = lookup_variable ("PATH", 4);
1644	char *path_string;
1645	char *fake_env[2];
1646	size_t pathlen = 0;
1647
1648	shellbase = strrchr (p, '/');
1649	bslash = strrchr (p, '\\');
1650	if (!shellbase \|\| bslash > shellbase)
1651	shellbase = bslash;
1652	if (!shellbase && p[1] == ':')
1653	shellbase = p + 1;
1654	if (shellbase)
1655	shellbase++;
1656	else
1657	shellbase = p;
1658
1659	/* Search for the basename of the shell (with standard
1660	executable extensions) along the $PATH. */
1661	if (pathv)
1662	pathlen = strlen (pathv->value);
1663	path_string = xmalloc (5 + pathlen + 2 + 1);
1664	/* On MSDOS, current directory is considered as part of $PATH. */
1665	sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1666	fake_env[0] = path_string;
1667	fake_env[1] = 0;
1668	if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1669	{
1670	char *tp;
1671
1672	for (tp = shellpath; *tp; tp++)
1673	if (*tp == '\\')
1674	*tp = '/';
1675
1676	v = define_variable_loc (varname, varname_len,
1677	shellpath, origin,
1678	flavor == f_recursive, flocp);
1679	}
1680	else
1681	v = lookup_variable (varname, varname_len);
1682
1683	free (path_string);
1684	}
1685	}
1686	else
1687	#endif /* __MSDOS__ */
1688	#ifdef WINDOWS32
1689	if ( varname_len == sizeof("SHELL") - 1 /* bird */
1690	&& (origin == o_file \|\| origin == o_override \|\| origin == o_command)
1691	&& streq (varname, "SHELL"))
1692	{
1693	extern char *default_shell;
1694
1695	/* Call shell locator function. If it returns TRUE, then
1696	set no_default_sh_exe to indicate sh was found and
1697	set new value for SHELL variable. */
1698
1699	if (find_and_set_default_shell (p))
1700	{
1701	v = define_variable_in_set (varname, varname_len, default_shell,
1702	# ifdef CONFIG_WITH_VALUE_LENGTH
1703	~0U, 1 /* duplicate_value */,
1704	# endif
1705	origin, flavor == f_recursive,
1706	(target_var
1707	? current_variable_set_list->set
1708	: NULL),
1709	flocp);
1710	no_default_sh_exe = 0;
1711	}
1712	else
1713	v = lookup_variable (varname, varname_len);
1714	# ifdef CONFIG_WITH_VALUE_LENGTH
1715	if (alloc_value)
1716	free (alloc_value);
1717	# endif
1718	}
1719	else
1720	#endif
1721
1722	/* If we are defining variables inside an $(eval ...), we might have a
1723	different variable context pushed, not the global context (maybe we're
1724	inside a $(call ...) or something. Since this function is only ever
1725	invoked in places where we want to define globally visible variables,
1726	make sure we define this variable in the global set. */
1727
1728	v = define_variable_in_set (varname, varname_len, p,
1729	#ifdef CONFIG_WITH_VALUE_LENGTH
1730	value_len, !alloc_value,
1731	#endif
1732	origin, flavor == f_recursive,
1733	(target_var
1734	? current_variable_set_list->set : NULL),
1735	flocp);
1736	v->append = append;
1737	v->conditional = conditional;
1738
1739	#ifndef CONFIG_WITH_VALUE_LENGTH
1740	if (alloc_value)
1741	free (alloc_value);
1742	#endif
1743
1744	return v;
1745	}
1746
1747
1748	/* Try to interpret LINE (a null-terminated string) as a variable definition.
1749
1750	ORIGIN may be o_file, o_override, o_env, o_env_override,
1751	or o_command specifying that the variable definition comes
1752	from a makefile, an override directive, the environment with
1753	or without the -e switch, or the command line.
1754
1755	See the comments for parse_variable_definition().
1756
1757	If LINE was recognized as a variable definition, a pointer to its `struct
1758	variable' is returned. If LINE is not a variable definition, NULL is
1759	returned. */
1760
1761	struct variable *
1762	parse_variable_definition (struct variable v, char line)
1763	{
1764	register int c;
1765	register char *p = line;
1766	register char *beg;
1767	register char *end;
1768	enum variable_flavor flavor = f_bogus;
1769	char *name;
1770
1771	while (1)
1772	{
1773	c = *p++;
1774	if (c == '\0' \|\| c == '#')
1775	return 0;
1776	if (c == '=')
1777	{
1778	end = p - 1;
1779	flavor = f_recursive;
1780	break;
1781	}
1782	else if (c == ':')
1783	if (*p == '=')
1784	{
1785	end = p++ - 1;
1786	flavor = f_simple;
1787	break;
1788	}
1789	else
1790	/* A colon other than := is a rule line, not a variable defn. */
1791	return 0;
1792	else if (c == '+' && *p == '=')
1793	{
1794	end = p++ - 1;
1795	flavor = f_append;
1796	break;
1797	}
1798	#ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1799	else if (c == '<' && *p == '=')
1800	{
1801	end = p++ - 1;
1802	flavor = f_prepend;
1803	break;
1804	}
1805	#endif
1806	else if (c == '?' && *p == '=')
1807	{
1808	end = p++ - 1;
1809	flavor = f_conditional;
1810	break;
1811	}
1812	else if (c == '$')
1813	{
1814	/* This might begin a variable expansion reference. Make sure we
1815	don't misrecognize chars inside the reference as =, := or +=. */
1816	char closeparen;
1817	int count;
1818	c = *p++;
1819	if (c == '(')
1820	closeparen = ')';
1821	else if (c == '{')
1822	closeparen = '}';
1823	else
1824	continue; /* Nope. */
1825
1826	/* P now points past the opening paren or brace.
1827	Count parens or braces until it is matched. */
1828	count = 0;
1829	for (; *p != '\0'; ++p)
1830	{
1831	if (*p == c)
1832	++count;
1833	else if (*p == closeparen && --count < 0)
1834	{
1835	++p;
1836	break;
1837	}
1838	}
1839	}
1840	}
1841	v->flavor = flavor;
1842
1843	beg = next_token (line);
1844	while (end > beg && isblank ((unsigned char)end[-1]))
1845	--end;
1846	p = next_token (p);
1847	v->value = p;
1848	#ifdef CONFIG_WITH_VALUE_LENGTH
1849	v->value_length = v->value_alloc_len = -1;
1850	#endif
1851
1852	/* Expand the name, so "$(foo)bar = baz" works. */
1853	name = alloca (end - beg + 1);
1854	memcpy (name, beg, end - beg);
1855	name[end - beg] = '\0';
1856	v->name = allocated_variable_expand (name);
1857
1858	if (v->name[0] == '\0')
1859	fatal (&v->fileinfo, _("empty variable name"));
1860
1861	return v;
1862	}
1863
1864
1865	/* Try to interpret LINE (a null-terminated string) as a variable definition.
1866
1867	ORIGIN may be o_file, o_override, o_env, o_env_override,
1868	or o_command specifying that the variable definition comes
1869	from a makefile, an override directive, the environment with
1870	or without the -e switch, or the command line.
1871
1872	See the comments for parse_variable_definition().
1873
1874	If LINE was recognized as a variable definition, a pointer to its `struct
1875	variable' is returned. If LINE is not a variable definition, NULL is
1876	returned. */
1877
1878	struct variable *
1879	try_variable_definition (const struct floc flocp, char line,
1880	enum variable_origin origin, int target_var)
1881	{
1882	struct variable v;
1883	struct variable *vp;
1884
1885	if (flocp != 0)
1886	v.fileinfo = *flocp;
1887	else
1888	v.fileinfo.filenm = 0;
1889
1890	if (!parse_variable_definition (&v, line))
1891	return 0;
1892
1893	vp = do_variable_definition (flocp, v.name, v.value,
1894	origin, v.flavor, target_var);
1895
1896	free (v.name);
1897
1898	return vp;
1899	}
1900
1901
1902	/* Print information for variable V, prefixing it with PREFIX. */
1903
1904	static void
1905	print_variable (const void item, void arg)
1906	{
1907	const struct variable *v = item;
1908	const char *prefix = arg;
1909	const char *origin;
1910
1911	switch (v->origin)
1912	{
1913	case o_default:
1914	origin = _("default");
1915	break;
1916	case o_env:
1917	origin = _("environment");
1918	break;
1919	case o_file:
1920	origin = _("makefile");
1921	break;
1922	case o_env_override:
1923	origin = _("environment under -e");
1924	break;
1925	case o_command:
1926	origin = _("command line");
1927	break;
1928	case o_override:
1929	origin = _("`override' directive");
1930	break;
1931	case o_automatic:
1932	origin = _("automatic");
1933	break;
1934	case o_invalid:
1935	default:
1936	abort ();
1937	}
1938	fputs ("# ", stdout);
1939	fputs (origin, stdout);
1940	if (v->fileinfo.filenm)
1941	printf (_(" (from `%s', line %lu)"),
1942	v->fileinfo.filenm, v->fileinfo.lineno);
1943	putchar ('\n');
1944	fputs (prefix, stdout);
1945
1946	/* Is this a `define'? */
1947	if (v->recursive && strchr (v->value, '\n') != 0)
1948	printf ("define %s\n%s\nendef\n", v->name, v->value);
1949	else
1950	{
1951	register char *p;
1952
1953	printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1954
1955	/* Check if the value is just whitespace. */
1956	p = next_token (v->value);
1957	if (p != v->value && *p == '\0')
1958	/* All whitespace. */
1959	printf ("$(subst ,,%s)", v->value);
1960	else if (v->recursive)
1961	fputs (v->value, stdout);
1962	else
1963	/* Double up dollar signs. */
1964	for (p = v->value; *p != '\0'; ++p)
1965	{
1966	if (*p == '$')
1967	putchar ('$');
1968	putchar (*p);
1969	}
1970	putchar ('\n');
1971	}
1972	}
1973
1974
1975	/* Print all the variables in SET. PREFIX is printed before
1976	the actual variable definitions (everything else is comments). */
1977
1978	void
1979	print_variable_set (struct variable_set set, char prefix)
1980	{
1981	hash_map_arg (&set->table, print_variable, prefix);
1982
1983	fputs (_("# variable set hash-table stats:\n"), stdout);
1984	fputs ("# ", stdout);
1985	hash_print_stats (&set->table, stdout);
1986	putc ('\n', stdout);
1987	}
1988
1989	/* Print the data base of variables. */
1990
1991	void
1992	print_variable_data_base (void)
1993	{
1994	puts (_("\n# Variables\n"));
1995
1996	print_variable_set (&global_variable_set, "");
1997
1998	puts (_("\n# Pattern-specific Variable Values"));
1999
2000	{
2001	struct pattern_var *p;
2002	int rules = 0;
2003
2004	for (p = pattern_vars; p != 0; p = p->next)
2005	{
2006	++rules;
2007	printf ("\n%s :\n", p->target);
2008	print_variable (&p->variable, "# ");
2009	}
2010
2011	if (rules == 0)
2012	puts (_("\n# No pattern-specific variable values."));
2013	else
2014	printf (_("\n# %u pattern-specific variable values"), rules);
2015	}
2016	}
2017
2018
2019	/* Print all the local variables of FILE. */
2020
2021	void
2022	print_file_variables (const struct file *file)
2023	{
2024	if (file->variables != 0)
2025	print_variable_set (file->variables->set, "# ");
2026	}
2027
2028	#ifdef WINDOWS32
2029	void
2030	sync_Path_environment (void)
2031	{
2032	char *path = allocated_variable_expand ("$(PATH)");
2033	static char *environ_path = NULL;
2034
2035	if (!path)
2036	return;
2037
2038	/*
2039	* If done this before, don't leak memory unnecessarily.
2040	* Free the previous entry before allocating new one.
2041	*/
2042	if (environ_path)
2043	free (environ_path);
2044
2045	/*
2046	* Create something WINDOWS32 world can grok
2047	*/
2048	convert_Path_to_windows32 (path, ';');
2049	environ_path = xstrdup (concat ("PATH", "=", path));
2050	putenv (environ_path);
2051	free (path);
2052	}
2053	#endif

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source: kBuild/trunk/src/kmk/variable.c@ 1169

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