variable.c@ 937

Last change on this file since 937 was 937, checked in by bird, 18 years ago
Implemented the prepend assignment operator '<='.
Property svn:eol-style set to `native`
File size: 60.3 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_TOUPPER_TOLOWER) \
1030	&& defined(CONFIG_WITH_RSORT) \
1031	&& defined(CONFIG_WITH_ABSPATHEX) \
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(KMK_HELPERS)
1037	(void) define_variable ("KMK_FEATURES", 12,
1038	"append-dash-n abspath"
1039	" rsort"
1040	" abspathex"
1041	" toupper tolower"
1042	" comp-vars comp-cmds"
1043	" stack"
1044	" math-int"
1045	" xargs"
1046	" kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one "
1047	, o_default, 0);
1048	# else /* MSC can't deal with strings mixed with #if/#endif, thus the slow way. */
1049	strcpy (buf, "append-dash-n abspath");
1050	# if defined (CONFIG_WITH_RSORT)
1051	strcat (buf, " rsort");
1052	# endif
1053	# if defined (CONFIG_WITH_ABSPATHEX)
1054	strcat (buf, " abspathex");
1055	# endif
1056	# if defined (CONFIG_WITH_TOUPPER_TOLOWER)
1057	strcat (buf, " toupper tolower");
1058	# endif
1059	# if defined (CONFIG_WITH_VALUE_LENGTH) && defined(CONFIG_WITH_COMPARE)
1060	strcat (buf, " comp-vars comp-cmds");
1061	# endif
1062	# if defined (CONFIG_WITH_STACK)
1063	strcat (buf, " stack");
1064	# endif
1065	# if defined (CONFIG_WITH_MATH)
1066	strcat (buf, " math-int");
1067	# endif
1068	# if defined (CONFIG_WITH_XARGS)
1069	strcat (buf, " xargs");
1070	# endif
1071	# ifdef KMK_HELPERS
1072	strcat (buf, " kb-src-tool kb-obj-base kb-obj-suff kb-src-prop kb-src-one");
1073	# endif
1074	(void) define_variable ("KMK_FEATURES", 12, buf, o_default, 0);
1075	# endif
1076
1077	#endif /* KMK */
1078
1079	#ifdef CONFIG_WITH_KMK_BUILTIN
1080	/* The supported kMk Builtin commands. */
1081	(void) define_variable ("KMK_BUILTIN", 11, "append cat cp echo install ln mkdir mv printf rm rmdir", o_default, 0);
1082	#endif
1083
1084	#ifdef __MSDOS__
1085	/* Allow to specify a special shell just for Make,
1086	and use $COMSPEC as the default $SHELL when appropriate. */
1087	{
1088	static char shell_str[] = "SHELL";
1089	const int shlen = sizeof (shell_str) - 1;
1090	struct variable *mshp = lookup_variable ("MAKESHELL", 9);
1091	struct variable *comp = lookup_variable ("COMSPEC", 7);
1092
1093	/* Make $MAKESHELL override $SHELL even if -e is in effect. */
1094	if (mshp)
1095	(void) define_variable (shell_str, shlen,
1096	mshp->value, o_env_override, 0);
1097	else if (comp)
1098	{
1099	/* $COMSPEC shouldn't override $SHELL. */
1100	struct variable *shp = lookup_variable (shell_str, shlen);
1101
1102	if (!shp)
1103	(void) define_variable (shell_str, shlen, comp->value, o_env, 0);
1104	}
1105	}
1106	#elif defined(__EMX__)
1107	{
1108	static char shell_str[] = "SHELL";
1109	const int shlen = sizeof (shell_str) - 1;
1110	struct variable *shell = lookup_variable (shell_str, shlen);
1111	struct variable *replace = lookup_variable ("MAKESHELL", 9);
1112
1113	/* if $MAKESHELL is defined in the environment assume o_env_override */
1114	if (replace && *replace->value && replace->origin == o_env)
1115	replace->origin = o_env_override;
1116
1117	/* if $MAKESHELL is not defined use $SHELL but only if the variable
1118	did not come from the environment */
1119	if (!replace \|\| !*replace->value)
1120	if (shell && *shell->value && (shell->origin == o_env
1121	\|\| shell->origin == o_env_override))
1122	{
1123	/* overwrite whatever we got from the environment */
1124	free(shell->value);
1125	shell->value = xstrdup (default_shell);
1126	shell->origin = o_default;
1127	}
1128
1129	/* Some people do not like cmd to be used as the default
1130	if $SHELL is not defined in the Makefile.
1131	With -DNO_CMD_DEFAULT you can turn off this behaviour */
1132	# ifndef NO_CMD_DEFAULT
1133	/* otherwise use $COMSPEC */
1134	if (!replace \|\| !*replace->value)
1135	replace = lookup_variable ("COMSPEC", 7);
1136
1137	/* otherwise use $OS2_SHELL */
1138	if (!replace \|\| !*replace->value)
1139	replace = lookup_variable ("OS2_SHELL", 9);
1140	# else
1141	# warning NO_CMD_DEFAULT: GNU make will not use CMD.EXE as default shell
1142	# endif
1143
1144	if (replace && *replace->value)
1145	/* overwrite $SHELL */
1146	(void) define_variable (shell_str, shlen, replace->value,
1147	replace->origin, 0);
1148	else
1149	/* provide a definition if there is none */
1150	(void) define_variable (shell_str, shlen, default_shell,
1151	o_default, 0);
1152	}
1153
1154	#endif
1155
1156	/* This won't override any definition, but it will provide one if there
1157	isn't one there. */
1158	v = define_variable ("SHELL", 5, default_shell, o_default, 0);
1159
1160	/* On MSDOS we do use SHELL from environment, since it isn't a standard
1161	environment variable on MSDOS, so whoever sets it, does that on purpose.
1162	On OS/2 we do not use SHELL from environment but we have already handled
1163	that problem above. */
1164	#if !defined(__MSDOS__) && !defined(__EMX__)
1165	/* Don't let SHELL come from the environment. */
1166	if (*v->value == '\0' \|\| v->origin == o_env \|\| v->origin == o_env_override)
1167	{
1168	free (v->value);
1169	v->origin = o_file;
1170	v->value = xstrdup (default_shell);
1171	#ifdef CONFIG_WITH_VALUE_LENGTH
1172	v->value_length = strlen (v->value);
1173	v->value_alloc_len = v->value_length + 1;
1174	#endif
1175	}
1176	#endif
1177
1178	/* Make sure MAKEFILES gets exported if it is set. */
1179	v = define_variable ("MAKEFILES", 9, "", o_default, 0);
1180	v->export = v_ifset;
1181
1182	/* Define the magic D and F variables in terms of
1183	the automatic variables they are variations of. */
1184
1185	#ifdef VMS
1186	define_variable ("@D", 2, "$(dir $@)", o_automatic, 1);
1187	define_variable ("%D", 2, "$(dir $%)", o_automatic, 1);
1188	define_variable ("D", 2, "$(dir $)", o_automatic, 1);
1189	define_variable ("<D", 2, "$(dir $<)", o_automatic, 1);
1190	define_variable ("?D", 2, "$(dir $?)", o_automatic, 1);
1191	define_variable ("^D", 2, "$(dir $^)", o_automatic, 1);
1192	define_variable ("+D", 2, "$(dir $+)", o_automatic, 1);
1193	#else
1194	define_variable ("@D", 2, "$(patsubst %/,%,$(dir $@))", o_automatic, 1);
1195	define_variable ("%D", 2, "$(patsubst %/,%,$(dir $%))", o_automatic, 1);
1196	define_variable ("D", 2, "$(patsubst %/,%,$(dir $))", o_automatic, 1);
1197	define_variable ("<D", 2, "$(patsubst %/,%,$(dir $<))", o_automatic, 1);
1198	define_variable ("?D", 2, "$(patsubst %/,%,$(dir $?))", o_automatic, 1);
1199	define_variable ("^D", 2, "$(patsubst %/,%,$(dir $^))", o_automatic, 1);
1200	define_variable ("+D", 2, "$(patsubst %/,%,$(dir $+))", o_automatic, 1);
1201	#endif
1202	define_variable ("@F", 2, "$(notdir $@)", o_automatic, 1);
1203	define_variable ("%F", 2, "$(notdir $%)", o_automatic, 1);
1204	define_variable ("F", 2, "$(notdir $)", o_automatic, 1);
1205	define_variable ("<F", 2, "$(notdir $<)", o_automatic, 1);
1206	define_variable ("?F", 2, "$(notdir $?)", o_automatic, 1);
1207	define_variable ("^F", 2, "$(notdir $^)", o_automatic, 1);
1208	define_variable ("+F", 2, "$(notdir $+)", o_automatic, 1);
1209	}
1210
1211
1212	int export_all_variables;
1213
1214	/* Create a new environment for FILE's commands.
1215	If FILE is nil, this is for the `shell' function.
1216	The child's MAKELEVEL variable is incremented. */
1217
1218	char **
1219	target_environment (struct file *file)
1220	{
1221	struct variable_set_list *set_list;
1222	register struct variable_set_list *s;
1223	struct hash_table table;
1224	struct variable **v_slot;
1225	struct variable **v_end;
1226	struct variable makelevel_key;
1227	char **result_0;
1228	char **result;
1229
1230	if (file == 0)
1231	set_list = current_variable_set_list;
1232	else
1233	set_list = file->variables;
1234
1235	hash_init (&table, VARIABLE_BUCKETS,
1236	variable_hash_1, variable_hash_2, variable_hash_cmp);
1237
1238	/* Run through all the variable sets in the list,
1239	accumulating variables in TABLE. */
1240	for (s = set_list; s != 0; s = s->next)
1241	{
1242	struct variable_set *set = s->set;
1243	v_slot = (struct variable **) set->table.ht_vec;
1244	v_end = v_slot + set->table.ht_size;
1245	for ( ; v_slot < v_end; v_slot++)
1246	if (! HASH_VACANT (*v_slot))
1247	{
1248	struct variable **new_slot;
1249	struct variable v = v_slot;
1250
1251	/* If this is a per-target variable and it hasn't been touched
1252	already then look up the global version and take its export
1253	value. */
1254	if (v->per_target && v->export == v_default)
1255	{
1256	struct variable *gv;
1257
1258	gv = lookup_variable_in_set (v->name, strlen(v->name),
1259	&global_variable_set);
1260	if (gv)
1261	v->export = gv->export;
1262	}
1263
1264	switch (v->export)
1265	{
1266	case v_default:
1267	if (v->origin == o_default \|\| v->origin == o_automatic)
1268	/* Only export default variables by explicit request. */
1269	continue;
1270
1271	/* The variable doesn't have a name that can be exported. */
1272	if (! v->exportable)
1273	continue;
1274
1275	if (! export_all_variables
1276	&& v->origin != o_command
1277	&& v->origin != o_env && v->origin != o_env_override)
1278	continue;
1279	break;
1280
1281	case v_export:
1282	break;
1283
1284	case v_noexport:
1285	/* If this is the SHELL variable and it's not exported, then
1286	add the value from our original environment. */
1287	if (streq (v->name, "SHELL"))
1288	{
1289	extern struct variable shell_var;
1290	v = &shell_var;
1291	break;
1292	}
1293	continue;
1294
1295	case v_ifset:
1296	if (v->origin == o_default)
1297	continue;
1298	break;
1299	}
1300
1301	new_slot = (struct variable **) hash_find_slot (&table, v);
1302	if (HASH_VACANT (*new_slot))
1303	hash_insert_at (&table, v, new_slot);
1304	}
1305	}
1306
1307	makelevel_key.name = MAKELEVEL_NAME;
1308	makelevel_key.length = MAKELEVEL_LENGTH;
1309	#ifdef VARIABLE_HASH /* bird */
1310	makelevel_key.hash1 = variable_hash_1i (MAKELEVEL_NAME, MAKELEVEL_LENGTH);
1311	makelevel_key.hash2 = 0;
1312	#endif
1313	hash_delete (&table, &makelevel_key);
1314
1315	result = result_0 = xmalloc ((table.ht_fill + 2) * sizeof (char *));
1316
1317	v_slot = (struct variable **) table.ht_vec;
1318	v_end = v_slot + table.ht_size;
1319	for ( ; v_slot < v_end; v_slot++)
1320	if (! HASH_VACANT (*v_slot))
1321	{
1322	struct variable v = v_slot;
1323
1324	/* If V is recursively expanded and didn't come from the environment,
1325	expand its value. If it came from the environment, it should
1326	go back into the environment unchanged. */
1327	if (v->recursive
1328	&& v->origin != o_env && v->origin != o_env_override)
1329	{
1330	char *value = recursively_expand_for_file (v, file);
1331	#ifdef WINDOWS32
1332	if (strcmp(v->name, "Path") == 0 \|\|
1333	strcmp(v->name, "PATH") == 0)
1334	convert_Path_to_windows32(value, ';');
1335	#endif
1336	*result++ = xstrdup (concat (v->name, "=", value));
1337	free (value);
1338	}
1339	else
1340	{
1341	#ifdef WINDOWS32
1342	if (strcmp(v->name, "Path") == 0 \|\|
1343	strcmp(v->name, "PATH") == 0)
1344	convert_Path_to_windows32(v->value, ';');
1345	#endif
1346	*result++ = xstrdup (concat (v->name, "=", v->value));
1347	}
1348	}
1349
1350	*result = xmalloc (100);
1351	sprintf (*result, "%s=%u", MAKELEVEL_NAME, makelevel + 1);
1352	*++result = 0;
1353
1354	hash_free (&table, 0);
1355
1356	return result_0;
1357	}
1358
1359
1360	#ifdef CONFIG_WITH_VALUE_LENGTH
1361	static struct variable *
1362	do_variable_definition_append (const struct floc flocp, struct variable v, const char *value,
1363	enum variable_origin origin, int append)
1364	{
1365	if (env_overrides && origin == o_env)
1366	origin = o_env_override;
1367
1368	if (env_overrides && v->origin == o_env)
1369	/* V came from in the environment. Since it was defined
1370	before the switches were parsed, it wasn't affected by -e. */
1371	v->origin = o_env_override;
1372
1373	/* A variable of this name is already defined.
1374	If the old definition is from a stronger source
1375	than this one, don't redefine it. */
1376	if ((int) origin < (int) v->origin)
1377	return v;
1378	v->origin = origin;
1379
1380	/* location */
1381	if (flocp != 0)
1382	v->fileinfo = *flocp;
1383
1384	/* The juicy bits, append the specified value to the variable
1385	This is a heavily exercied code path in kBuild. */
1386	if (v->recursive)
1387	{
1388	/* The previous definition of the variable was recursive.
1389	The new value is the unexpanded old and new values. */
1390	unsigned int value_len = strlen (value);
1391	unsigned int new_value_len = value_len + (v->value_length != 0 ? 1 + v->value_length : 0);
1392	int done_1st_prepend_copy = 0;
1393
1394	/* adjust the size. */
1395	if ((unsigned)v->value_alloc_len <= new_value_len)
1396	{
1397	/* XXX: anticipating further appends/prepends. */
1398	if (value_len > v->value_alloc_len)
1399	v->value_alloc_len = (new_value_len + 0x80) + 0x7f;
1400	else
1401	v->value_alloc_len = (new_value_len + value_len + 0x80) + 0x7f;
1402	if (append \|\| !v->value_length)
1403	v->value = xrealloc (v->value, v->value_alloc_len);
1404	else
1405	{
1406	/* avoid the extra memcpy the xrealloc may have to do */
1407	char *new_buf = xmalloc (v->value_alloc_len);
1408	memcpy (&new_buf[value_len + 1], v->value, v->value_length + 1);
1409	done_1st_prepend_copy = 1;
1410	free (v->value);
1411	v->value = new_buf;
1412	}
1413	}
1414
1415	/* insert the new bits */
1416	if (v->value_length != 0)
1417	{
1418	if (append)
1419	{
1420	v->value[v->value_length] = ' ';
1421	memcpy (&v->value[v->value_length + 1], value, value_len + 1);
1422	}
1423	else
1424	{
1425	if (!done_1st_prepend_copy)
1426	memmove (&v->value[value_len + 1], v->value, v->value_length + 1);
1427	v->value[value_len] = ' ';
1428	memcpy (v->value, value, value_len);
1429	}
1430	}
1431	else
1432	memcpy (v->value, value, value_len + 1);
1433	v->value_length = new_value_len;
1434	}
1435	else
1436	{
1437	/* The previous definition of the variable was simple.
1438	The new value comes from the old value, which was expanded
1439	when it was set; and from the expanded new value. */
1440	append_expanded_string_to_variable(v, value);
1441	}
1442
1443	/* update the variable */
1444	return v;
1445	}
1446	#endif /* CONFIG_WITH_VALUE_LENGTH */
1447
1448
1449	/* Given a variable, a value, and a flavor, define the variable.
1450	See the try_variable_definition() function for details on the parameters. */
1451
1452	struct variable *
1453	do_variable_definition (const struct floc flocp, const char varname,
1454	const char *value, enum variable_origin origin,
1455	enum variable_flavor flavor, int target_var)
1456	{
1457	const char *p;
1458	char *alloc_value = NULL;
1459	struct variable *v;
1460	int append = 0;
1461	int conditional = 0;
1462	const size_t varname_len = strlen (varname); /* bird */
1463	#ifdef CONFIG_WITH_VALUE_LENGTH
1464	unsigned int value_len = ~0U;
1465	#endif
1466
1467	/* Calculate the variable's new value in VALUE. */
1468
1469	switch (flavor)
1470	{
1471	default:
1472	case f_bogus:
1473	/* Should not be possible. */
1474	abort ();
1475	case f_simple:
1476	/* A simple variable definition "var := value". Expand the value.
1477	We have to allocate memory since otherwise it'll clobber the
1478	variable buffer, and we may still need that if we're looking at a
1479	target-specific variable. */
1480	p = alloc_value = allocated_variable_expand (value);
1481	break;
1482	case f_conditional:
1483	/* A conditional variable definition "var ?= value".
1484	The value is set IFF the variable is not defined yet. */
1485	v = lookup_variable (varname, varname_len);
1486	if (v)
1487	return v;
1488
1489	conditional = 1;
1490	flavor = f_recursive;
1491	/* FALLTHROUGH */
1492	case f_recursive:
1493	/* A recursive variable definition "var = value".
1494	The value is used verbatim. */
1495	p = value;
1496	break;
1497	#ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1498	case f_append:
1499	case f_prepend:
1500	{
1501	const enum variable_flavor org_flavor = flavor;
1502	#else
1503	case f_append:
1504	{
1505	#endif
1506
1507	/* If we have += but we're in a target variable context, we want to
1508	append only with other variables in the context of this target. */
1509	if (target_var)
1510	{
1511	append = 1;
1512	v = lookup_variable_in_set (varname, varname_len,
1513	current_variable_set_list->set);
1514
1515	/* Don't append from the global set if a previous non-appending
1516	target-specific variable definition exists. */
1517	if (v && !v->append)
1518	append = 0;
1519	}
1520	else
1521	v = lookup_variable (varname, varname_len);
1522
1523	if (v == 0)
1524	{
1525	/* There was no old value.
1526	This becomes a normal recursive definition. */
1527	p = value;
1528	flavor = f_recursive;
1529	}
1530	else
1531	{
1532	#ifdef CONFIG_WITH_VALUE_LENGTH
1533	v->append = append;
1534	# ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1535	return do_variable_definition_append (flocp, v, value, origin, org_flavor == f_append);
1536	# else
1537	return do_variable_definition_append (flocp, v, value, origin, 1);
1538	# endif
1539	#else /* !CONFIG_WITH_VALUE_LENGTH */
1540
1541	/* Paste the old and new values together in VALUE. */
1542
1543	unsigned int oldlen, vallen;
1544	const char *val;
1545	char *tp;
1546
1547	val = value;
1548	if (v->recursive)
1549	/* The previous definition of the variable was recursive.
1550	The new value is the unexpanded old and new values. */
1551	flavor = f_recursive;
1552	else
1553	/* The previous definition of the variable was simple.
1554	The new value comes from the old value, which was expanded
1555	when it was set; and from the expanded new value. Allocate
1556	memory for the expansion as we may still need the rest of the
1557	buffer if we're looking at a target-specific variable. */
1558	val = alloc_value = allocated_variable_expand (val);
1559
1560	oldlen = strlen (v->value);
1561	vallen = strlen (val);
1562	tp = alloca (oldlen + 1 + vallen + 1);
1563	# ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1564	if (org_flavor == f_prepend)
1565	{
1566	memcpy (tp, val, vallen);
1567	tp[oldlen] = ' ';
1568	memcpy (&tp[oldlen + 1], v->value, oldlen + 1);
1569	}
1570	else
1571	# endif /* CONFIG_WITH_PREPEND_ASSIGNMENT */
1572	{
1573	memcpy (tp, v->value, oldlen);
1574	tp[oldlen] = ' ';
1575	memcpy (&tp[oldlen + 1], val, vallen + 1);
1576	}
1577	p = tp;
1578	#endif /* !CONFIG_WITH_VALUE_LENGTH */
1579	}
1580	}
1581	}
1582
1583	#ifdef __MSDOS__
1584	/* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1585	non-Unix systems don't conform to this default configuration (in
1586	fact, most of them don't even have `/bin'). On the other hand,
1587	$SHELL in the environment, if set, points to the real pathname of
1588	the shell.
1589	Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1590	the Makefile override $SHELL from the environment. But first, we
1591	look for the basename of the shell in the directory where SHELL=
1592	points, and along the $PATH; if it is found in any of these places,
1593	we define $SHELL to be the actual pathname of the shell. Thus, if
1594	you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1595	your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1596	defining SHELL to be "d:/unix/bash.exe". */
1597	if ((origin == o_file \|\| origin == o_override)
1598	&& strcmp (varname, "SHELL") == 0)
1599	{
1600	PATH_VAR (shellpath);
1601	extern char * __dosexec_find_on_path (const char , char [], char *);
1602
1603	/* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1604	if (__dosexec_find_on_path (p, NULL, shellpath))
1605	{
1606	char *tp;
1607
1608	for (tp = shellpath; *tp; tp++)
1609	if (*tp == '\\')
1610	*tp = '/';
1611
1612	v = define_variable_loc (varname, varname_len,
1613	shellpath, origin, flavor == f_recursive,
1614	flocp);
1615	}
1616	else
1617	{
1618	const char shellbase, bslash;
1619	struct variable *pathv = lookup_variable ("PATH", 4);
1620	char *path_string;
1621	char *fake_env[2];
1622	size_t pathlen = 0;
1623
1624	shellbase = strrchr (p, '/');
1625	bslash = strrchr (p, '\\');
1626	if (!shellbase \|\| bslash > shellbase)
1627	shellbase = bslash;
1628	if (!shellbase && p[1] == ':')
1629	shellbase = p + 1;
1630	if (shellbase)
1631	shellbase++;
1632	else
1633	shellbase = p;
1634
1635	/* Search for the basename of the shell (with standard
1636	executable extensions) along the $PATH. */
1637	if (pathv)
1638	pathlen = strlen (pathv->value);
1639	path_string = xmalloc (5 + pathlen + 2 + 1);
1640	/* On MSDOS, current directory is considered as part of $PATH. */
1641	sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1642	fake_env[0] = path_string;
1643	fake_env[1] = 0;
1644	if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1645	{
1646	char *tp;
1647
1648	for (tp = shellpath; *tp; tp++)
1649	if (*tp == '\\')
1650	*tp = '/';
1651
1652	v = define_variable_loc (varname, varname_len,
1653	shellpath, origin,
1654	flavor == f_recursive, flocp);
1655	}
1656	else
1657	v = lookup_variable (varname, varname_len);
1658
1659	free (path_string);
1660	}
1661	}
1662	else
1663	#endif /* __MSDOS__ */
1664	#ifdef WINDOWS32
1665	if ( varname_len == sizeof("SHELL") - 1 /* bird */
1666	&& (origin == o_file \|\| origin == o_override \|\| origin == o_command)
1667	&& streq (varname, "SHELL"))
1668	{
1669	extern char *default_shell;
1670
1671	/* Call shell locator function. If it returns TRUE, then
1672	set no_default_sh_exe to indicate sh was found and
1673	set new value for SHELL variable. */
1674
1675	if (find_and_set_default_shell (p))
1676	{
1677	v = define_variable_in_set (varname, varname_len, default_shell,
1678	# ifdef CONFIG_WITH_VALUE_LENGTH
1679	~0U, 1 /* duplicate_value */,
1680	# endif
1681	origin, flavor == f_recursive,
1682	(target_var
1683	? current_variable_set_list->set
1684	: NULL),
1685	flocp);
1686	no_default_sh_exe = 0;
1687	}
1688	else
1689	v = lookup_variable (varname, varname_len);
1690	# ifdef CONFIG_WITH_VALUE_LENGTH
1691	if (alloc_value)
1692	free (alloc_value);
1693	# endif
1694	}
1695	else
1696	#endif
1697
1698	/* If we are defining variables inside an $(eval ...), we might have a
1699	different variable context pushed, not the global context (maybe we're
1700	inside a $(call ...) or something. Since this function is only ever
1701	invoked in places where we want to define globally visible variables,
1702	make sure we define this variable in the global set. */
1703
1704	v = define_variable_in_set (varname, varname_len, p,
1705	#ifdef CONFIG_WITH_VALUE_LENGTH
1706	value_len, !alloc_value,
1707	#endif
1708	origin, flavor == f_recursive,
1709	(target_var
1710	? current_variable_set_list->set : NULL),
1711	flocp);
1712	v->append = append;
1713	v->conditional = conditional;
1714
1715	#ifndef CONFIG_WITH_VALUE_LENGTH
1716	if (alloc_value)
1717	free (alloc_value);
1718	#endif
1719
1720	return v;
1721	}
1722
1723
1724	/* Try to interpret LINE (a null-terminated string) as a variable definition.
1725
1726	ORIGIN may be o_file, o_override, o_env, o_env_override,
1727	or o_command specifying that the variable definition comes
1728	from a makefile, an override directive, the environment with
1729	or without the -e switch, or the command line.
1730
1731	See the comments for parse_variable_definition().
1732
1733	If LINE was recognized as a variable definition, a pointer to its `struct
1734	variable' is returned. If LINE is not a variable definition, NULL is
1735	returned. */
1736
1737	struct variable *
1738	parse_variable_definition (struct variable v, char line)
1739	{
1740	register int c;
1741	register char *p = line;
1742	register char *beg;
1743	register char *end;
1744	enum variable_flavor flavor = f_bogus;
1745	char *name;
1746
1747	while (1)
1748	{
1749	c = *p++;
1750	if (c == '\0' \|\| c == '#')
1751	return 0;
1752	if (c == '=')
1753	{
1754	end = p - 1;
1755	flavor = f_recursive;
1756	break;
1757	}
1758	else if (c == ':')
1759	if (*p == '=')
1760	{
1761	end = p++ - 1;
1762	flavor = f_simple;
1763	break;
1764	}
1765	else
1766	/* A colon other than := is a rule line, not a variable defn. */
1767	return 0;
1768	else if (c == '+' && *p == '=')
1769	{
1770	end = p++ - 1;
1771	flavor = f_append;
1772	break;
1773	}
1774	#ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
1775	else if (c == '<' && *p == '=')
1776	{
1777	end = p++ - 1;
1778	flavor = f_prepend;
1779	break;
1780	}
1781	#endif
1782	else if (c == '?' && *p == '=')
1783	{
1784	end = p++ - 1;
1785	flavor = f_conditional;
1786	break;
1787	}
1788	else if (c == '$')
1789	{
1790	/* This might begin a variable expansion reference. Make sure we
1791	don't misrecognize chars inside the reference as =, := or +=. */
1792	char closeparen;
1793	int count;
1794	c = *p++;
1795	if (c == '(')
1796	closeparen = ')';
1797	else if (c == '{')
1798	closeparen = '}';
1799	else
1800	continue; /* Nope. */
1801
1802	/* P now points past the opening paren or brace.
1803	Count parens or braces until it is matched. */
1804	count = 0;
1805	for (; *p != '\0'; ++p)
1806	{
1807	if (*p == c)
1808	++count;
1809	else if (*p == closeparen && --count < 0)
1810	{
1811	++p;
1812	break;
1813	}
1814	}
1815	}
1816	}
1817	v->flavor = flavor;
1818
1819	beg = next_token (line);
1820	while (end > beg && isblank ((unsigned char)end[-1]))
1821	--end;
1822	p = next_token (p);
1823	v->value = p;
1824	#ifdef CONFIG_WITH_VALUE_LENGTH
1825	v->value_length = v->value_alloc_len = -1;
1826	#endif
1827
1828	/* Expand the name, so "$(foo)bar = baz" works. */
1829	name = alloca (end - beg + 1);
1830	memcpy (name, beg, end - beg);
1831	name[end - beg] = '\0';
1832	v->name = allocated_variable_expand (name);
1833
1834	if (v->name[0] == '\0')
1835	fatal (&v->fileinfo, _("empty variable name"));
1836
1837	return v;
1838	}
1839
1840
1841	/* Try to interpret LINE (a null-terminated string) as a variable definition.
1842
1843	ORIGIN may be o_file, o_override, o_env, o_env_override,
1844	or o_command specifying that the variable definition comes
1845	from a makefile, an override directive, the environment with
1846	or without the -e switch, or the command line.
1847
1848	See the comments for parse_variable_definition().
1849
1850	If LINE was recognized as a variable definition, a pointer to its `struct
1851	variable' is returned. If LINE is not a variable definition, NULL is
1852	returned. */
1853
1854	struct variable *
1855	try_variable_definition (const struct floc flocp, char line,
1856	enum variable_origin origin, int target_var)
1857	{
1858	struct variable v;
1859	struct variable *vp;
1860
1861	if (flocp != 0)
1862	v.fileinfo = *flocp;
1863	else
1864	v.fileinfo.filenm = 0;
1865
1866	if (!parse_variable_definition (&v, line))
1867	return 0;
1868
1869	vp = do_variable_definition (flocp, v.name, v.value,
1870	origin, v.flavor, target_var);
1871
1872	free (v.name);
1873
1874	return vp;
1875	}
1876
1877
1878	/* Print information for variable V, prefixing it with PREFIX. */
1879
1880	static void
1881	print_variable (const void item, void arg)
1882	{
1883	const struct variable *v = item;
1884	const char *prefix = arg;
1885	const char *origin;
1886
1887	switch (v->origin)
1888	{
1889	case o_default:
1890	origin = _("default");
1891	break;
1892	case o_env:
1893	origin = _("environment");
1894	break;
1895	case o_file:
1896	origin = _("makefile");
1897	break;
1898	case o_env_override:
1899	origin = _("environment under -e");
1900	break;
1901	case o_command:
1902	origin = _("command line");
1903	break;
1904	case o_override:
1905	origin = _("`override' directive");
1906	break;
1907	case o_automatic:
1908	origin = _("automatic");
1909	break;
1910	case o_invalid:
1911	default:
1912	abort ();
1913	}
1914	fputs ("# ", stdout);
1915	fputs (origin, stdout);
1916	if (v->fileinfo.filenm)
1917	printf (_(" (from `%s', line %lu)"),
1918	v->fileinfo.filenm, v->fileinfo.lineno);
1919	putchar ('\n');
1920	fputs (prefix, stdout);
1921
1922	/* Is this a `define'? */
1923	if (v->recursive && strchr (v->value, '\n') != 0)
1924	printf ("define %s\n%s\nendef\n", v->name, v->value);
1925	else
1926	{
1927	register char *p;
1928
1929	printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1930
1931	/* Check if the value is just whitespace. */
1932	p = next_token (v->value);
1933	if (p != v->value && *p == '\0')
1934	/* All whitespace. */
1935	printf ("$(subst ,,%s)", v->value);
1936	else if (v->recursive)
1937	fputs (v->value, stdout);
1938	else
1939	/* Double up dollar signs. */
1940	for (p = v->value; *p != '\0'; ++p)
1941	{
1942	if (*p == '$')
1943	putchar ('$');
1944	putchar (*p);
1945	}
1946	putchar ('\n');
1947	}
1948	}
1949
1950
1951	/* Print all the variables in SET. PREFIX is printed before
1952	the actual variable definitions (everything else is comments). */
1953
1954	void
1955	print_variable_set (struct variable_set set, char prefix)
1956	{
1957	hash_map_arg (&set->table, print_variable, prefix);
1958
1959	fputs (_("# variable set hash-table stats:\n"), stdout);
1960	fputs ("# ", stdout);
1961	hash_print_stats (&set->table, stdout);
1962	putc ('\n', stdout);
1963	}
1964
1965	/* Print the data base of variables. */
1966
1967	void
1968	print_variable_data_base (void)
1969	{
1970	puts (_("\n# Variables\n"));
1971
1972	print_variable_set (&global_variable_set, "");
1973
1974	puts (_("\n# Pattern-specific Variable Values"));
1975
1976	{
1977	struct pattern_var *p;
1978	int rules = 0;
1979
1980	for (p = pattern_vars; p != 0; p = p->next)
1981	{
1982	++rules;
1983	printf ("\n%s :\n", p->target);
1984	print_variable (&p->variable, "# ");
1985	}
1986
1987	if (rules == 0)
1988	puts (_("\n# No pattern-specific variable values."));
1989	else
1990	printf (_("\n# %u pattern-specific variable values"), rules);
1991	}
1992	}
1993
1994
1995	/* Print all the local variables of FILE. */
1996
1997	void
1998	print_file_variables (const struct file *file)
1999	{
2000	if (file->variables != 0)
2001	print_variable_set (file->variables->set, "# ");
2002	}
2003
2004	#ifdef WINDOWS32
2005	void
2006	sync_Path_environment (void)
2007	{
2008	char *path = allocated_variable_expand ("$(PATH)");
2009	static char *environ_path = NULL;
2010
2011	if (!path)
2012	return;
2013
2014	/*
2015	* If done this before, don't leak memory unnecessarily.
2016	* Free the previous entry before allocating new one.
2017	*/
2018	if (environ_path)
2019	free (environ_path);
2020
2021	/*
2022	* Create something WINDOWS32 world can grok
2023	*/
2024	convert_Path_to_windows32 (path, ';');
2025	environ_path = xstrdup (concat ("PATH", "=", path));
2026	putenv (environ_path);
2027	free (path);
2028	}
2029	#endif

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source: kBuild/trunk/src/gmakenew/variable.c@ 937

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