root/trunk/freewrt/tools/gmake/variable.h

Revision 2223, 8.7 kB (checked in by tg, 5 years ago)

add some of the sources from GNU make 3.81
unchanged

Line 
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 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 "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     o_automatic,        /* Automatic variable -- cannot be set.  */
32     o_invalid           /* Core dump time.  */
33   };
34
35 enum variable_flavor
36   {
37     f_bogus,            /* Bogus (error) */
38     f_simple,           /* Simple definition (:=) */
39     f_recursive,        /* Recursive definition (=) */
40     f_append,           /* Appending definition (+=) */
41     f_conditional       /* Conditional definition (?=) */
42   };
43
44 /* Structure that represents one variable definition.
45    Each bucket of the hash table is a chain of these,
46    chained through `next'.  */
47
48 #define EXP_COUNT_BITS  15      /* This gets all the bitfields into 32 bits */
49 #define EXP_COUNT_MAX   ((1<<EXP_COUNT_BITS)-1)
50
51 struct variable
52   {
53     char *name;                 /* Variable name.  */
54     int length;                 /* strlen (name) */
55     char *value;                /* Variable value.  */
56     struct floc fileinfo;       /* Where the variable was defined.  */
57     unsigned int recursive:1;   /* Gets recursively re-evaluated.  */
58     unsigned int append:1;      /* Nonzero if an appending target-specific
59                                    variable.  */
60     unsigned int conditional:1; /* Nonzero if set with a ?=. */
61     unsigned int per_target:1;  /* Nonzero if a target-specific variable.  */
62     unsigned int special:1;     /* Nonzero if this is a special variable. */
63     unsigned int exportable:1;  /* Nonzero if the variable _could_ be
64                                    exported.  */
65     unsigned int expanding:1;   /* Nonzero if currently being expanded.  */
66     unsigned int exp_count:EXP_COUNT_BITS;
67                                 /* If >1, allow this many self-referential
68                                    expansions.  */
69     enum variable_flavor
70       flavor ENUM_BITFIELD (3); /* Variable flavor.  */
71     enum variable_origin
72       origin ENUM_BITFIELD (3); /* Variable origin.  */
73     enum variable_export
74       {
75         v_export,               /* Export this variable.  */
76         v_noexport,             /* Don't export this variable.  */
77         v_ifset,                /* Export it if it has a non-default value.  */
78         v_default               /* Decide in target_environment.  */
79       } export ENUM_BITFIELD (2);
80   };
81
82 /* Structure that represents a variable set.  */
83
84 struct variable_set
85   {
86     struct hash_table table;    /* Hash table of variables.  */
87   };
88
89 /* Structure that represents a list of variable sets.  */
90
91 struct variable_set_list
92   {
93     struct variable_set_list *next;     /* Link in the chain.  */
94     struct variable_set *set;           /* Variable set.  */
95   };
96
97 /* Structure used for pattern-specific variables.  */
98
99 struct pattern_var
100   {
101     struct pattern_var *next;
102     char *target;
103     unsigned int len;
104     char *suffix;
105     struct variable variable;
106   };
107
108 extern char *variable_buffer;
109 extern struct variable_set_list *current_variable_set_list;
110
111 /* expand.c */
112 extern char *variable_buffer_output PARAMS ((char *ptr, char *string, unsigned int length));
113 extern char *variable_expand PARAMS ((char *line));
114 extern char *variable_expand_for_file PARAMS ((char *line, struct file *file));
115 extern char *allocated_variable_expand_for_file PARAMS ((char *line, struct file *file));
116 #define allocated_variable_expand(line) \
117   allocated_variable_expand_for_file (line, (struct file *) 0)
118 extern char *expand_argument PARAMS ((const char *str, const char *end));
119 extern char *variable_expand_string PARAMS ((char *line, char *string,
120                                              long length));
121 extern void install_variable_buffer PARAMS ((char **bufp, unsigned int *lenp));
122 extern void restore_variable_buffer PARAMS ((char *buf, unsigned int len));
123
124 /* function.c */
125 extern int handle_function PARAMS ((char **op, char **stringp));
126 extern int pattern_matches PARAMS ((char *pattern, char *percent, char *str));
127 extern char *subst_expand PARAMS ((char *o, char *text, char *subst, char *replace,
128                 unsigned int slen, unsigned int rlen, int by_word));
129 extern char *patsubst_expand PARAMS ((char *o, char *text, char *pattern, char *replace,
130                 char *pattern_percent, char *replace_percent));
131
132 /* expand.c */
133 extern char *recursively_expand_for_file PARAMS ((struct variable *v,
134                                                   struct file *file));
135 #define recursively_expand(v)   recursively_expand_for_file (v, NULL)
136
137 /* variable.c */
138 extern struct variable_set_list *create_new_variable_set PARAMS ((void));
139 extern void free_variable_set PARAMS ((struct variable_set_list *));
140 extern struct variable_set_list *push_new_variable_scope PARAMS ((void));
141 extern void pop_variable_scope PARAMS ((void));
142 extern void define_automatic_variables PARAMS ((void));
143 extern void initialize_file_variables PARAMS ((struct file *file, int read));
144 extern void print_file_variables PARAMS ((struct file *file));
145 extern void print_variable_set PARAMS ((struct variable_set *set, char *prefix));
146 extern void merge_variable_set_lists PARAMS ((struct variable_set_list **to_list, struct variable_set_list *from_list));
147 extern struct variable *do_variable_definition PARAMS ((const struct floc *flocp, const char *name, char *value, enum variable_origin origin, enum variable_flavor flavor, int target_var));
148 extern struct variable *parse_variable_definition PARAMS ((struct variable *v, char *line));
149 extern struct variable *try_variable_definition PARAMS ((const struct floc *flocp, char *line, enum variable_origin origin, int target_var));
150 extern void init_hash_global_variable_set PARAMS ((void));
151 extern void hash_init_function_table PARAMS ((void));
152 extern struct variable *lookup_variable PARAMS ((const char *name, unsigned int length));
153 extern struct variable *lookup_variable_in_set PARAMS ((const char *name,
154                                                         unsigned int length,
155                                                         const struct variable_set *set));
156
157 extern struct variable *define_variable_in_set
158     PARAMS ((const char *name, unsigned int length, char *value,
159              enum variable_origin origin, int recursive,
160              struct variable_set *set, const struct floc *flocp));
161
162 /* Define a variable in the current variable set.  */
163
164 #define define_variable(n,l,v,o,r) \
165           define_variable_in_set((n),(l),(v),(o),(r),\
166                                  current_variable_set_list->set,NILF)
167
168 /* Define a variable with a location in the current variable set.  */
169
170 #define define_variable_loc(n,l,v,o,r,f) \
171           define_variable_in_set((n),(l),(v),(o),(r),\
172                                  current_variable_set_list->set,(f))
173
174 /* Define a variable with a location in the global variable set.  */
175
176 #define define_variable_global(n,l,v,o,r,f) \
177           define_variable_in_set((n),(l),(v),(o),(r),NULL,(f))
178
179 /* Define a variable in FILE's variable set.  */
180
181 #define define_variable_for_file(n,l,v,o,r,f) \
182           define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF)
183
184 /* Warn that NAME is an undefined variable.  */
185
186 #define warn_undefined(n,l) do{\
187                               if (warn_undefined_variables_flag) \
188                                 error (reading_file, \
189                                        _("warning: undefined variable `%.*s'"), \
190                                 (int)(l), (n)); \
191                               }while(0)
192
193 extern char **target_environment PARAMS ((struct file *file));
194
195 extern struct pattern_var *create_pattern_var PARAMS ((char *target, char *suffix));
196
197 extern int export_all_variables;
198
199 #define MAKELEVEL_NAME "MAKELEVEL"
200 #define MAKELEVEL_LENGTH (sizeof (MAKELEVEL_NAME) - 1)
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