variable.h@ 2129

Last change on this file since 2129 was 2005, checked in by bird, 16 years ago
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1	/* Definitions for using variables in 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, 2007 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 3 of the License, or (at your option) any later
10	version.
11
12	GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
13	WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
14	A PARTICULAR PURPOSE. See the GNU General Public License for more details.
15
16	You should have received a copy of the GNU General Public License along with
17	this program. If not, see <http://www.gnu.org/licenses/>. */
18
19	#include "hash.h"
20
21	/* Codes in a variable definition saying where the definition came from.
22	Increasing numeric values signify less-overridable definitions. */
23	enum variable_origin
24	{
25	o_default, /* Variable from the default set. */
26	o_env, /* Variable from environment. */
27	o_file, /* Variable given in a makefile. */
28	o_env_override, /* Variable from environment, if -e. */
29	o_command, /* Variable given by user. */
30	o_override, /* Variable from an `override' directive. */
31	#ifdef CONFIG_WITH_LOCAL_VARIABLES
32	o_local, /* Variable from an 'local' directive. */
33	#endif
34	o_automatic, /* Automatic variable -- cannot be set. */
35	o_invalid /* Core dump time. */
36	};
37
38	enum variable_flavor
39	{
40	f_bogus, /* Bogus (error) */
41	f_simple, /* Simple definition (:=) */
42	f_recursive, /* Recursive definition (=) */
43	f_append, /* Appending definition (+=) */
44	#ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
45	f_prepend, /* Prepending definition (>=) */
46	#endif
47	f_conditional /* Conditional definition (?=) */
48	};
49
50	/* Structure that represents one variable definition.
51	Each bucket of the hash table is a chain of these,
52	chained through `next'. */
53
54	#define EXP_COUNT_BITS 15 /* This gets all the bitfields into 32 bits */
55	#define EXP_COUNT_MAX ((1<<EXP_COUNT_BITS)-1)
56	#ifdef CONFIG_WITH_VALUE_LENGTH
57	#define VAR_ALIGN_VALUE_ALLOC(len) ( ((len) + (unsigned int)15) & ~(unsigned int)15 )
58	#endif
59
60	struct variable
61	{
62	#ifndef CONFIG_WITH_STRCACHE2
63	char name; / Variable name. */
64	#else
65	const char name; / Variable name (in varaible_strcache). */
66	#endif
67	int length; /* strlen (name) */
68	#ifdef CONFIG_WITH_VALUE_LENGTH
69	unsigned int value_length; /* The length of the value. */
70	unsigned int value_alloc_len; /* The amount of memory we've actually allocated. */
71	/* FIXME: make lengths unsigned! */
72	#endif
73	char value; / Variable value. */
74	struct floc fileinfo; /* Where the variable was defined. */
75	unsigned int recursive:1; /* Gets recursively re-evaluated. */
76	unsigned int append:1; /* Nonzero if an appending target-specific
77	variable. */
78	unsigned int conditional:1; /* Nonzero if set with a ?=. */
79	unsigned int per_target:1; /* Nonzero if a target-specific variable. */
80	unsigned int special:1; /* Nonzero if this is a special variable. */
81	unsigned int exportable:1; /* Nonzero if the variable _could_ be
82	exported. */
83	unsigned int expanding:1; /* Nonzero if currently being expanded. */
84	unsigned int exp_count:EXP_COUNT_BITS;
85	/* If >1, allow this many self-referential
86	expansions. */
87	#ifdef CONFIG_WITH_RDONLY_VARIABLE_VALUE
88	unsigned int rdonly_val:1; /* VALUE is read only (strcache/const). */
89	#endif
90	enum variable_flavor
91	flavor ENUM_BITFIELD (3); /* Variable flavor. */
92	enum variable_origin
93	#ifdef CONFIG_WITH_LOCAL_VARIABLES
94	origin ENUM_BITFIELD (4); /* Variable origin. */
95	#else
96	origin ENUM_BITFIELD (3); /* Variable origin. */
97	#endif
98	enum variable_export
99	{
100	v_export, /* Export this variable. */
101	v_noexport, /* Don't export this variable. */
102	v_ifset, /* Export it if it has a non-default value. */
103	v_default /* Decide in target_environment. */
104	} export ENUM_BITFIELD (2);
105	#ifdef CONFIG_WITH_MAKE_STATS
106	unsigned int changes;
107	unsigned int reallocs;
108	#endif
109	};
110
111	/* Structure that represents a variable set. */
112
113	struct variable_set
114	{
115	struct hash_table table; /* Hash table of variables. */
116	};
117
118	/* Structure that represents a list of variable sets. */
119
120	struct variable_set_list
121	{
122	struct variable_set_list next; / Link in the chain. */
123	struct variable_set set; / Variable set. */
124	};
125
126	/* Structure used for pattern-specific variables. */
127
128	struct pattern_var
129	{
130	struct pattern_var *next;
131	const char *suffix;
132	const char *target;
133	unsigned int len;
134	struct variable variable;
135	};
136
137	extern char *variable_buffer;
138	extern struct variable_set_list *current_variable_set_list;
139	#ifdef KMK
140	extern unsigned int variable_buffer_length;
141	#define VARIABLE_BUFFER_ZONE 5
142	#endif
143
144	/* expand.c */
145	#ifndef KMK
146	char variable_buffer_output (char ptr, const char *string, unsigned int length);
147	#else /* KMK */
148	/* Subroutine of variable_expand and friends:
149	The text to add is LENGTH chars starting at STRING to the variable_buffer.
150	The text is added to the buffer at PTR, and the updated pointer into
151	the buffer is returned as the value. Thus, the value returned by
152	each call to variable_buffer_output should be the first argument to
153	the following call. */
154
155	__inline static char *
156	variable_buffer_output (char ptr, const char string, unsigned int length)
157	{
158	register unsigned int newlen = length + (ptr - variable_buffer);
159
160	if ((newlen + VARIABLE_BUFFER_ZONE) > variable_buffer_length)
161	{
162	unsigned int offset = ptr - variable_buffer;
163	variable_buffer_length = variable_buffer_length <= 1024
164	? 2048 : variable_buffer_length * 4;
165	if (variable_buffer_length < newlen + 100)
166	variable_buffer_length = (newlen + 100 + 1023) & ~1023U;
167	variable_buffer = xrealloc (variable_buffer, variable_buffer_length);
168	ptr = variable_buffer + offset;
169	}
170
171	# ifndef _MSC_VER
172	switch (length)
173	{
174	case 4: ptr[3] = string[3];
175	case 3: ptr[2] = string[2];
176	case 2: ptr[1] = string[1];
177	case 1: ptr[0] = string[0];
178	case 0:
179	break;
180	default:
181	memcpy (ptr, string, length);
182	break;
183	}
184	# else
185	memcpy (ptr, string, length);
186	# endif
187	return ptr + length;
188	}
189
190	#endif /* KMK */
191	char variable_expand (const char line);
192	char variable_expand_for_file (const char line, struct file *file);
193	#if defined (CONFIG_WITH_VALUE_LENGTH) \|\| defined (CONFIG_WITH_COMMANDS_FUNC)
194	char variable_expand_for_file_2 (char o, const char *line, unsigned int lenght,
195	struct file file, unsigned int value_lenp);
196	#endif
197	char allocated_variable_expand_for_file (const char line, struct file *file);
198	#ifndef CONFIG_WITH_VALUE_LENGTH
199	#define allocated_variable_expand(line) \
200	allocated_variable_expand_for_file (line, (struct file *) 0)
201	#else /* CONFIG_WITH_VALUE_LENGTH */
202	# define allocated_variable_expand(line) \
203	allocated_variable_expand_2 (line, -1, NULL)
204	char allocated_variable_expand_2 (const char line, unsigned int length, unsigned int *value_lenp);
205	char allocated_variable_expand_3 (const char line, unsigned int length,
206	unsigned int value_lenp, unsigned int buffer_lengthp);
207	void recycle_variable_buffer (char *buffer, unsigned int length);
208	#endif /* CONFIG_WITH_VALUE_LENGTH */
209	char expand_argument (const char str, const char *end);
210	#ifndef CONFIG_WITH_VALUE_LENGTH
211	char variable_expand_string (char line, const char *string, long length);
212	#else /* CONFIG_WITH_VALUE_LENGTH */
213	char variable_expand_string_2 (char line, const char string, long length, char *eol);
214	__inline static char *
215	variable_expand_string (char line, const char string, long length)
216	{
217	char *ignored;
218	return variable_expand_string_2 (line, string, length, &ignored);
219	}
220	#endif /* CONFIG_WITH_VALUE_LENGTH */
221	void install_variable_buffer (char *bufp, unsigned int lenp);
222	void restore_variable_buffer (char *buf, unsigned int len);
223	#ifdef CONFIG_WITH_VALUE_LENGTH
224	void append_expanded_string_to_variable (struct variable v, const char value,
225	unsigned int value_len, int append);
226	#endif
227
228	/* function.c */
229	#ifndef CONFIG_WITH_VALUE_LENGTH
230	int handle_function (char op, const char stringp);
231	#else
232	int handle_function (char op, const char stringp, const char nameend, const char eol);
233	#endif
234	int pattern_matches (const char pattern, const char percent, const char *str);
235	char subst_expand (char o, const char text, const char subst,
236	const char *replace, unsigned int slen, unsigned int rlen,
237	int by_word);
238	char patsubst_expand_pat (char o, const char text, const char pattern,
239	const char replace, const char pattern_percent,
240	const char *replace_percent);
241	char patsubst_expand (char o, const char text, char pattern, char *replace);
242	#ifdef CONFIG_WITH_COMMANDS_FUNC
243	char func_commands (char o, char *argv, const char funcname);
244	#endif
245	#if defined (CONFIG_WITH_VALUE_LENGTH)
246	/* Avoid calling handle_function for every variable, do the
247	basic checks in variable_expand_string_2. */
248	extern char func_char_map[256];
249	# define MAX_FUNCTION_LENGTH 12
250	# define MIN_FUNCTION_LENGTH 2
251	MY_INLINE const char *
252	may_be_function_name (const char name, const char eos)
253	{
254	unsigned char ch;
255	unsigned int len = name - eos;
256
257	/* Minimum length is MIN + whitespace. Check this directly.
258	ASSUMES: MIN_FUNCTION_LENGTH == 2 */
259
260	if (MY_PREDICT_TRUE(len < MIN_FUNCTION_LENGTH + 1
261	\|\| !func_char_map[(int)(name[0])]
262	\|\| !func_char_map[(int)(name[1])]))
263	return 0;
264	if (MY_PREDICT_TRUE(!func_char_map[ch = name[2]]))
265	return isspace (ch) ? name + 2 : 0;
266
267	name += 3;
268	if (len > MAX_FUNCTION_LENGTH)
269	len = MAX_FUNCTION_LENGTH - 3;
270	else if (len == 3)
271	len -= 3;
272	if (!len)
273	return 0;
274
275	/* Loop over the remaining possiblities. */
276
277	while (func_char_map[ch = *name])
278	{
279	if (!len--)
280	return 0;
281	name++;
282	}
283	if (ch == '\0' \|\| isblank (ch))
284	return name;
285	return 0;
286	}
287	#endif /* CONFIG_WITH_VALUE_LENGTH */
288
289	/* expand.c */
290	#ifndef CONFIG_WITH_VALUE_LENGTH
291	char recursively_expand_for_file (struct variable v, struct file *file);
292	#define recursively_expand(v) recursively_expand_for_file (v, NULL)
293	#else
294	char recursively_expand_for_file (struct variable v, struct file *file,
295	unsigned int *value_lenp);
296	#define recursively_expand(v) recursively_expand_for_file (v, NULL, NULL)
297	#endif
298
299	/* variable.c */
300	struct variable_set_list *create_new_variable_set (void);
301	void free_variable_set (struct variable_set_list *);
302	struct variable_set_list *push_new_variable_scope (void);
303	void pop_variable_scope (void);
304	void define_automatic_variables (void);
305	void initialize_file_variables (struct file *file, int reading);
306	void print_file_variables (const struct file *file);
307	void print_variable_set (struct variable_set set, char prefix);
308	void merge_variable_set_lists (struct variable_set_list **to_list,
309	struct variable_set_list *from_list);
310	#ifndef CONFIG_WITH_VALUE_LENGTH
311	struct variable do_variable_definition (const struct floc flocp,
312	const char name, const char value,
313	enum variable_origin origin,
314	enum variable_flavor flavor,
315	int target_var);
316	struct variable parse_variable_definition (struct variable v, char *line);
317	struct variable try_variable_definition (const struct floc flocp, char *line,
318	enum variable_origin origin,
319	int target_var);
320	#else /* CONFIG_WITH_VALUE_LENGTH */
321	# define do_variable_definition(flocp, varname, value, origin, flavor, target_var) \
322	do_variable_definition_2 ((flocp), (varname), (value), ~0U, 0, NULL, \
323	(origin), (flavor), (target_var))
324
325	struct variable do_variable_definition_2 (const struct floc flocp,
326	const char *varname,
327	const char *value,
328	unsigned int value_len,
329	int simple_value, char *free_value,
330	enum variable_origin origin,
331	enum variable_flavor flavor,
332	int target_var);
333	struct variable parse_variable_definition (struct variable v, char *line,
334	char *eos);
335	struct variable try_variable_definition (const struct floc flocp, char *line,
336	char *eos,
337	enum variable_origin origin,
338	int target_var);
339	#endif /* CONFIG_WITH_VALUE_LENGTH */
340	void init_hash_global_variable_set (void);
341	void hash_init_function_table (void);
342	struct variable lookup_variable (const char name, unsigned int length);
343	struct variable lookup_variable_in_set (const char name, unsigned int length,
344	const struct variable_set *set);
345
346	#ifdef CONFIG_WITH_VALUE_LENGTH
347	void append_string_to_variable (struct variable v, const char value,
348	unsigned int value_len, int append);
349
350	struct variable define_variable_in_set (const char name, unsigned int length,
351	const char *value,
352	unsigned int value_length,
353	int duplicate_value,
354	enum variable_origin origin,
355	int recursive,
356	struct variable_set *set,
357	const struct floc *flocp);
358
359	/* Define a variable in the current variable set. */
360
361	#define define_variable(n,l,v,o,r) \
362	define_variable_in_set((n),(l),(v),~0U,1,(o),(r),\
363	current_variable_set_list->set,NILF)
364
365	#define define_variable_vl(n,l,v,vl,dv,o,r) \
366	define_variable_in_set((n),(l),(v),(vl),(dv),(o),(r),\
367	current_variable_set_list->set,NILF)
368
369	/* Define a variable with a location in the current variable set. */
370
371	#define define_variable_loc(n,l,v,o,r,f) \
372	define_variable_in_set((n),(l),(v),~0U,1,(o),(r),\
373	current_variable_set_list->set,(f))
374
375	/* Define a variable with a location in the global variable set. */
376
377	#define define_variable_global(n,l,v,o,r,f) \
378	define_variable_in_set((n),(l),(v),~0U,1,(o),(r),NULL,(f))
379
380	#define define_variable_vl_global(n,l,v,vl,dv,o,r,f) \
381	define_variable_in_set((n),(l),(v),(vl),(dv),(o),(r),NULL,(f))
382
383	/* Define a variable in FILE's variable set. */
384
385	#define define_variable_for_file(n,l,v,o,r,f) \
386	define_variable_in_set((n),(l),(v),~0U,1,(o),(r),(f)->variables->set,NILF)
387
388	#else /* !CONFIG_WITH_VALUE_LENGTH */
389
390	struct variable define_variable_in_set (const char name, unsigned int length,
391	const char *value,
392	enum variable_origin origin,
393	int recursive,
394	struct variable_set *set,
395	const struct floc *flocp);
396
397	/* Define a variable in the current variable set. */
398
399	#define define_variable(n,l,v,o,r) \
400	define_variable_in_set((n),(l),(v),(o),(r),\
401	current_variable_set_list->set,NILF) /* force merge conflict */
402
403	/* Define a variable with a location in the current variable set. */
404
405	#define define_variable_loc(n,l,v,o,r,f) \
406	define_variable_in_set((n),(l),(v),(o),(r),\
407	current_variable_set_list->set,(f)) /* force merge conflict */
408
409	/* Define a variable with a location in the global variable set. */
410
411	#define define_variable_global(n,l,v,o,r,f) \
412	define_variable_in_set((n),(l),(v),(o),(r),NULL,(f)) /* force merge conflict */
413
414	/* Define a variable in FILE's variable set. */
415
416	#define define_variable_for_file(n,l,v,o,r,f) \
417	define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF) /* force merge conflict */
418
419	#endif /* !CONFIG_WITH_VALUE_LENGTH */
420
421	/* Warn that NAME is an undefined variable. */
422
423	#define warn_undefined(n,l) do{\
424	if (warn_undefined_variables_flag) \
425	error (reading_file, \
426	_("warning: undefined variable `%.*s'"), \
427	(int)(l), (n)); \
428	}while(0)
429
430	char *target_environment (struct file file);
431
432	struct pattern_var create_pattern_var (const char target,
433	const char *suffix);
434
435	extern int export_all_variables;
436	#ifdef CONFIG_WITH_STRCACHE2
437	extern struct strcache2 variable_strcache;
438	#endif
439
440	#ifdef KMK
441	# define MAKELEVEL_NAME "KMK_LEVEL"
442	#else
443	#define MAKELEVEL_NAME "MAKELEVEL"
444	#endif
445	#define MAKELEVEL_LENGTH (sizeof (MAKELEVEL_NAME) - 1)

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source: kBuild/trunk/src/kmk/variable.h@ 2129

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