variable.c@ 936

Last change on this file since 936 was 929, checked in by bird, 18 years ago
we've got mv and printf.
Property svn:eol-style set to `native`
File size: 58.6 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)
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
1393	/* adjust the size. */
1394	if ((unsigned)v->value_alloc_len <= new_value_len)
1395	{
1396	v->value_alloc_len = (new_value_len + 0x80) + 0x7f;
1397	v->value = xrealloc (v->value, v->value_alloc_len);
1398	}
1399
1400	/* insert the new bits */
1401	if (v->value_length != 0)
1402	{
1403	v->value[v->value_length] = ' ';
1404	memcpy (&v->value[v->value_length + 1], value, value_len + 1);
1405	}
1406	else
1407	memcpy (v->value, value, value_len + 1);
1408	v->value_length = new_value_len;
1409	}
1410	else
1411	{
1412	/* The previous definition of the variable was simple.
1413	The new value comes from the old value, which was expanded
1414	when it was set; and from the expanded new value. */
1415	append_expanded_string_to_variable(v, value);
1416	}
1417
1418	/* update the variable */
1419	return v;
1420	}
1421	#endif /* CONFIG_WITH_VALUE_LENGTH */
1422
1423
1424	/* Given a variable, a value, and a flavor, define the variable.
1425	See the try_variable_definition() function for details on the parameters. */
1426
1427	struct variable *
1428	do_variable_definition (const struct floc flocp, const char varname,
1429	const char *value, enum variable_origin origin,
1430	enum variable_flavor flavor, int target_var)
1431	{
1432	const char *p;
1433	char *alloc_value = NULL;
1434	struct variable *v;
1435	int append = 0;
1436	int conditional = 0;
1437	const size_t varname_len = strlen (varname); /* bird */
1438	# ifdef CONFIG_WITH_VALUE_LENGTH
1439	unsigned int value_len = ~0U;
1440	# endif
1441
1442	/* Calculate the variable's new value in VALUE. */
1443
1444	switch (flavor)
1445	{
1446	default:
1447	case f_bogus:
1448	/* Should not be possible. */
1449	abort ();
1450	case f_simple:
1451	/* A simple variable definition "var := value". Expand the value.
1452	We have to allocate memory since otherwise it'll clobber the
1453	variable buffer, and we may still need that if we're looking at a
1454	target-specific variable. */
1455	p = alloc_value = allocated_variable_expand (value);
1456	break;
1457	case f_conditional:
1458	/* A conditional variable definition "var ?= value".
1459	The value is set IFF the variable is not defined yet. */
1460	v = lookup_variable (varname, varname_len);
1461	if (v)
1462	return v;
1463
1464	conditional = 1;
1465	flavor = f_recursive;
1466	/* FALLTHROUGH */
1467	case f_recursive:
1468	/* A recursive variable definition "var = value".
1469	The value is used verbatim. */
1470	p = value;
1471	break;
1472	case f_append:
1473	{
1474	/* If we have += but we're in a target variable context, we want to
1475	append only with other variables in the context of this target. */
1476	if (target_var)
1477	{
1478	append = 1;
1479	v = lookup_variable_in_set (varname, varname_len,
1480	current_variable_set_list->set);
1481
1482	/* Don't append from the global set if a previous non-appending
1483	target-specific variable definition exists. */
1484	if (v && !v->append)
1485	append = 0;
1486	}
1487	else
1488	v = lookup_variable (varname, varname_len);
1489
1490	if (v == 0)
1491	{
1492	/* There was no old value.
1493	This becomes a normal recursive definition. */
1494	p = value;
1495	flavor = f_recursive;
1496	}
1497	else
1498	{
1499	#ifdef CONFIG_WITH_VALUE_LENGTH
1500	v->append = append;
1501	return do_variable_definition_append (flocp, v, value, origin);
1502	#else /* !CONFIG_WITH_VALUE_LENGTH */
1503
1504	/* Paste the old and new values together in VALUE. */
1505
1506	unsigned int oldlen, vallen;
1507	const char *val;
1508	char *tp;
1509
1510	val = value;
1511	if (v->recursive)
1512	/* The previous definition of the variable was recursive.
1513	The new value is the unexpanded old and new values. */
1514	flavor = f_recursive;
1515	else
1516	/* The previous definition of the variable was simple.
1517	The new value comes from the old value, which was expanded
1518	when it was set; and from the expanded new value. Allocate
1519	memory for the expansion as we may still need the rest of the
1520	buffer if we're looking at a target-specific variable. */
1521	val = alloc_value = allocated_variable_expand (val);
1522
1523	oldlen = strlen (v->value);
1524	vallen = strlen (val);
1525	tp = alloca (oldlen + 1 + vallen + 1);
1526	memcpy (tp, v->value, oldlen);
1527	tp[oldlen] = ' ';
1528	memcpy (&tp[oldlen + 1], val, vallen + 1);
1529	p = tp;
1530	#endif /* !CONFIG_WITH_VALUE_LENGTH */
1531	}
1532	}
1533	}
1534
1535	#ifdef __MSDOS__
1536	/* Many Unix Makefiles include a line saying "SHELL=/bin/sh", but
1537	non-Unix systems don't conform to this default configuration (in
1538	fact, most of them don't even have `/bin'). On the other hand,
1539	$SHELL in the environment, if set, points to the real pathname of
1540	the shell.
1541	Therefore, we generally won't let lines like "SHELL=/bin/sh" from
1542	the Makefile override $SHELL from the environment. But first, we
1543	look for the basename of the shell in the directory where SHELL=
1544	points, and along the $PATH; if it is found in any of these places,
1545	we define $SHELL to be the actual pathname of the shell. Thus, if
1546	you have bash.exe installed as d:/unix/bash.exe, and d:/unix is on
1547	your $PATH, then SHELL=/usr/local/bin/bash will have the effect of
1548	defining SHELL to be "d:/unix/bash.exe". */
1549	if ((origin == o_file \|\| origin == o_override)
1550	&& strcmp (varname, "SHELL") == 0)
1551	{
1552	PATH_VAR (shellpath);
1553	extern char * __dosexec_find_on_path (const char , char [], char *);
1554
1555	/* See if we can find "/bin/sh.exe", "/bin/sh.com", etc. */
1556	if (__dosexec_find_on_path (p, NULL, shellpath))
1557	{
1558	char *tp;
1559
1560	for (tp = shellpath; *tp; tp++)
1561	if (*tp == '\\')
1562	*tp = '/';
1563
1564	v = define_variable_loc (varname, varname_len,
1565	shellpath, origin, flavor == f_recursive,
1566	flocp);
1567	}
1568	else
1569	{
1570	const char shellbase, bslash;
1571	struct variable *pathv = lookup_variable ("PATH", 4);
1572	char *path_string;
1573	char *fake_env[2];
1574	size_t pathlen = 0;
1575
1576	shellbase = strrchr (p, '/');
1577	bslash = strrchr (p, '\\');
1578	if (!shellbase \|\| bslash > shellbase)
1579	shellbase = bslash;
1580	if (!shellbase && p[1] == ':')
1581	shellbase = p + 1;
1582	if (shellbase)
1583	shellbase++;
1584	else
1585	shellbase = p;
1586
1587	/* Search for the basename of the shell (with standard
1588	executable extensions) along the $PATH. */
1589	if (pathv)
1590	pathlen = strlen (pathv->value);
1591	path_string = xmalloc (5 + pathlen + 2 + 1);
1592	/* On MSDOS, current directory is considered as part of $PATH. */
1593	sprintf (path_string, "PATH=.;%s", pathv ? pathv->value : "");
1594	fake_env[0] = path_string;
1595	fake_env[1] = 0;
1596	if (__dosexec_find_on_path (shellbase, fake_env, shellpath))
1597	{
1598	char *tp;
1599
1600	for (tp = shellpath; *tp; tp++)
1601	if (*tp == '\\')
1602	*tp = '/';
1603
1604	v = define_variable_loc (varname, varname_len,
1605	shellpath, origin,
1606	flavor == f_recursive, flocp);
1607	}
1608	else
1609	v = lookup_variable (varname, varname_len);
1610
1611	free (path_string);
1612	}
1613	}
1614	else
1615	#endif /* __MSDOS__ */
1616	#ifdef WINDOWS32
1617	if ( varname_len == sizeof("SHELL") - 1 /* bird */
1618	&& (origin == o_file \|\| origin == o_override \|\| origin == o_command)
1619	&& streq (varname, "SHELL"))
1620	{
1621	extern char *default_shell;
1622
1623	/* Call shell locator function. If it returns TRUE, then
1624	set no_default_sh_exe to indicate sh was found and
1625	set new value for SHELL variable. */
1626
1627	if (find_and_set_default_shell (p))
1628	{
1629	v = define_variable_in_set (varname, varname_len, default_shell,
1630	# ifdef CONFIG_WITH_VALUE_LENGTH
1631	~0U, 1 /* duplicate_value */,
1632	# endif
1633	origin, flavor == f_recursive,
1634	(target_var
1635	? current_variable_set_list->set
1636	: NULL),
1637	flocp);
1638	no_default_sh_exe = 0;
1639	}
1640	else
1641	v = lookup_variable (varname, varname_len);
1642	# ifdef CONFIG_WITH_VALUE_LENGTH
1643	if (alloc_value)
1644	free (alloc_value);
1645	# endif
1646	}
1647	else
1648	#endif
1649
1650	/* If we are defining variables inside an $(eval ...), we might have a
1651	different variable context pushed, not the global context (maybe we're
1652	inside a $(call ...) or something. Since this function is only ever
1653	invoked in places where we want to define globally visible variables,
1654	make sure we define this variable in the global set. */
1655
1656	v = define_variable_in_set (varname, varname_len, p,
1657	#ifdef CONFIG_WITH_VALUE_LENGTH
1658	value_len, !alloc_value,
1659	#endif
1660	origin, flavor == f_recursive,
1661	(target_var
1662	? current_variable_set_list->set : NULL),
1663	flocp);
1664	v->append = append;
1665	v->conditional = conditional;
1666
1667	#ifndef CONFIG_WITH_VALUE_LENGTH
1668	if (alloc_value)
1669	free (alloc_value);
1670	#endif
1671
1672	return v;
1673	}
1674
1675
1676	/* Try to interpret LINE (a null-terminated string) as a variable definition.
1677
1678	ORIGIN may be o_file, o_override, o_env, o_env_override,
1679	or o_command specifying that the variable definition comes
1680	from a makefile, an override directive, the environment with
1681	or without the -e switch, or the command line.
1682
1683	See the comments for parse_variable_definition().
1684
1685	If LINE was recognized as a variable definition, a pointer to its `struct
1686	variable' is returned. If LINE is not a variable definition, NULL is
1687	returned. */
1688
1689	struct variable *
1690	parse_variable_definition (struct variable v, char line)
1691	{
1692	register int c;
1693	register char *p = line;
1694	register char *beg;
1695	register char *end;
1696	enum variable_flavor flavor = f_bogus;
1697	char *name;
1698
1699	while (1)
1700	{
1701	c = *p++;
1702	if (c == '\0' \|\| c == '#')
1703	return 0;
1704	if (c == '=')
1705	{
1706	end = p - 1;
1707	flavor = f_recursive;
1708	break;
1709	}
1710	else if (c == ':')
1711	if (*p == '=')
1712	{
1713	end = p++ - 1;
1714	flavor = f_simple;
1715	break;
1716	}
1717	else
1718	/* A colon other than := is a rule line, not a variable defn. */
1719	return 0;
1720	else if (c == '+' && *p == '=')
1721	{
1722	end = p++ - 1;
1723	flavor = f_append;
1724	break;
1725	}
1726	else if (c == '?' && *p == '=')
1727	{
1728	end = p++ - 1;
1729	flavor = f_conditional;
1730	break;
1731	}
1732	else if (c == '$')
1733	{
1734	/* This might begin a variable expansion reference. Make sure we
1735	don't misrecognize chars inside the reference as =, := or +=. */
1736	char closeparen;
1737	int count;
1738	c = *p++;
1739	if (c == '(')
1740	closeparen = ')';
1741	else if (c == '{')
1742	closeparen = '}';
1743	else
1744	continue; /* Nope. */
1745
1746	/* P now points past the opening paren or brace.
1747	Count parens or braces until it is matched. */
1748	count = 0;
1749	for (; *p != '\0'; ++p)
1750	{
1751	if (*p == c)
1752	++count;
1753	else if (*p == closeparen && --count < 0)
1754	{
1755	++p;
1756	break;
1757	}
1758	}
1759	}
1760	}
1761	v->flavor = flavor;
1762
1763	beg = next_token (line);
1764	while (end > beg && isblank ((unsigned char)end[-1]))
1765	--end;
1766	p = next_token (p);
1767	v->value = p;
1768	#ifdef CONFIG_WITH_VALUE_LENGTH
1769	v->value_length = v->value_alloc_len = -1;
1770	#endif
1771
1772	/* Expand the name, so "$(foo)bar = baz" works. */
1773	name = alloca (end - beg + 1);
1774	memcpy (name, beg, end - beg);
1775	name[end - beg] = '\0';
1776	v->name = allocated_variable_expand (name);
1777
1778	if (v->name[0] == '\0')
1779	fatal (&v->fileinfo, _("empty variable name"));
1780
1781	return v;
1782	}
1783
1784
1785	/* Try to interpret LINE (a null-terminated string) as a variable definition.
1786
1787	ORIGIN may be o_file, o_override, o_env, o_env_override,
1788	or o_command specifying that the variable definition comes
1789	from a makefile, an override directive, the environment with
1790	or without the -e switch, or the command line.
1791
1792	See the comments for parse_variable_definition().
1793
1794	If LINE was recognized as a variable definition, a pointer to its `struct
1795	variable' is returned. If LINE is not a variable definition, NULL is
1796	returned. */
1797
1798	struct variable *
1799	try_variable_definition (const struct floc flocp, char line,
1800	enum variable_origin origin, int target_var)
1801	{
1802	struct variable v;
1803	struct variable *vp;
1804
1805	if (flocp != 0)
1806	v.fileinfo = *flocp;
1807	else
1808	v.fileinfo.filenm = 0;
1809
1810	if (!parse_variable_definition (&v, line))
1811	return 0;
1812
1813	vp = do_variable_definition (flocp, v.name, v.value,
1814	origin, v.flavor, target_var);
1815
1816	free (v.name);
1817
1818	return vp;
1819	}
1820
1821
1822	/* Print information for variable V, prefixing it with PREFIX. */
1823
1824	static void
1825	print_variable (const void item, void arg)
1826	{
1827	const struct variable *v = item;
1828	const char *prefix = arg;
1829	const char *origin;
1830
1831	switch (v->origin)
1832	{
1833	case o_default:
1834	origin = _("default");
1835	break;
1836	case o_env:
1837	origin = _("environment");
1838	break;
1839	case o_file:
1840	origin = _("makefile");
1841	break;
1842	case o_env_override:
1843	origin = _("environment under -e");
1844	break;
1845	case o_command:
1846	origin = _("command line");
1847	break;
1848	case o_override:
1849	origin = _("`override' directive");
1850	break;
1851	case o_automatic:
1852	origin = _("automatic");
1853	break;
1854	case o_invalid:
1855	default:
1856	abort ();
1857	}
1858	fputs ("# ", stdout);
1859	fputs (origin, stdout);
1860	if (v->fileinfo.filenm)
1861	printf (_(" (from `%s', line %lu)"),
1862	v->fileinfo.filenm, v->fileinfo.lineno);
1863	putchar ('\n');
1864	fputs (prefix, stdout);
1865
1866	/* Is this a `define'? */
1867	if (v->recursive && strchr (v->value, '\n') != 0)
1868	printf ("define %s\n%s\nendef\n", v->name, v->value);
1869	else
1870	{
1871	register char *p;
1872
1873	printf ("%s %s= ", v->name, v->recursive ? v->append ? "+" : "" : ":");
1874
1875	/* Check if the value is just whitespace. */
1876	p = next_token (v->value);
1877	if (p != v->value && *p == '\0')
1878	/* All whitespace. */
1879	printf ("$(subst ,,%s)", v->value);
1880	else if (v->recursive)
1881	fputs (v->value, stdout);
1882	else
1883	/* Double up dollar signs. */
1884	for (p = v->value; *p != '\0'; ++p)
1885	{
1886	if (*p == '$')
1887	putchar ('$');
1888	putchar (*p);
1889	}
1890	putchar ('\n');
1891	}
1892	}
1893
1894
1895	/* Print all the variables in SET. PREFIX is printed before
1896	the actual variable definitions (everything else is comments). */
1897
1898	void
1899	print_variable_set (struct variable_set set, char prefix)
1900	{
1901	hash_map_arg (&set->table, print_variable, prefix);
1902
1903	fputs (_("# variable set hash-table stats:\n"), stdout);
1904	fputs ("# ", stdout);
1905	hash_print_stats (&set->table, stdout);
1906	putc ('\n', stdout);
1907	}
1908
1909	/* Print the data base of variables. */
1910
1911	void
1912	print_variable_data_base (void)
1913	{
1914	puts (_("\n# Variables\n"));
1915
1916	print_variable_set (&global_variable_set, "");
1917
1918	puts (_("\n# Pattern-specific Variable Values"));
1919
1920	{
1921	struct pattern_var *p;
1922	int rules = 0;
1923
1924	for (p = pattern_vars; p != 0; p = p->next)
1925	{
1926	++rules;
1927	printf ("\n%s :\n", p->target);
1928	print_variable (&p->variable, "# ");
1929	}
1930
1931	if (rules == 0)
1932	puts (_("\n# No pattern-specific variable values."));
1933	else
1934	printf (_("\n# %u pattern-specific variable values"), rules);
1935	}
1936	}
1937
1938
1939	/* Print all the local variables of FILE. */
1940
1941	void
1942	print_file_variables (const struct file *file)
1943	{
1944	if (file->variables != 0)
1945	print_variable_set (file->variables->set, "# ");
1946	}
1947
1948	#ifdef WINDOWS32
1949	void
1950	sync_Path_environment (void)
1951	{
1952	char *path = allocated_variable_expand ("$(PATH)");
1953	static char *environ_path = NULL;
1954
1955	if (!path)
1956	return;
1957
1958	/*
1959	* If done this before, don't leak memory unnecessarily.
1960	* Free the previous entry before allocating new one.
1961	*/
1962	if (environ_path)
1963	free (environ_path);
1964
1965	/*
1966	* Create something WINDOWS32 world can grok
1967	*/
1968	convert_Path_to_windows32 (path, ';');
1969	environ_path = xstrdup (concat ("PATH", "=", path));
1970	putenv (environ_path);
1971	free (path);
1972	}
1973	#endif

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source: kBuild/trunk/src/gmakenew/variable.c@ 936

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