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[make.git] / variable.h
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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, 2008, 2009,
4 2010 Free Software Foundation, Inc.
5 This file is part of GNU Make.
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.
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.
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/>. */
19 #include "hash.h"
21 /* Codes in a variable definition saying where the definition came from.
22 Increasing numeric values signify less-overridable definitions. */
23 enum variable_origin
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. */
35 enum variable_flavor
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 f_shell /* Shell assignment (!=) */
45 /* Structure that represents one variable definition.
46 Each bucket of the hash table is a chain of these,
47 chained through `next'. */
49 #define EXP_COUNT_BITS 15 /* This gets all the bitfields into 32 bits */
50 #define EXP_COUNT_MAX ((1<<EXP_COUNT_BITS)-1)
52 struct variable
54 char *name; /* Variable name. */
55 int length; /* strlen (name) */
56 char *value; /* Variable value. */
57 struct floc fileinfo; /* Where the variable was defined. */
58 unsigned int recursive:1; /* Gets recursively re-evaluated. */
59 unsigned int append:1; /* Nonzero if an appending target-specific
60 variable. */
61 unsigned int conditional:1; /* Nonzero if set with a ?=. */
62 unsigned int per_target:1; /* Nonzero if a target-specific variable. */
63 unsigned int special:1; /* Nonzero if this is a special variable. */
64 unsigned int exportable:1; /* Nonzero if the variable _could_ be
65 exported. */
66 unsigned int expanding:1; /* Nonzero if currently being expanded. */
67 unsigned int private_var:1; /* Nonzero avoids inheritance of this
68 target-specific variable. */
69 unsigned int exp_count:EXP_COUNT_BITS;
70 /* If >1, allow this many self-referential
71 expansions. */
72 enum variable_flavor
73 flavor ENUM_BITFIELD (3); /* Variable flavor. */
74 enum variable_origin
75 origin ENUM_BITFIELD (3); /* Variable origin. */
76 enum variable_export
78 v_export, /* Export this variable. */
79 v_noexport, /* Don't export this variable. */
80 v_ifset, /* Export it if it has a non-default value. */
81 v_default /* Decide in target_environment. */
82 } export ENUM_BITFIELD (2);
85 /* Structure that represents a variable set. */
87 struct variable_set
89 struct hash_table table; /* Hash table of variables. */
92 /* Structure that represents a list of variable sets. */
94 struct variable_set_list
96 struct variable_set_list *next; /* Link in the chain. */
97 struct variable_set *set; /* Variable set. */
98 int next_is_parent; /* True if next is a parent target. */
101 /* Structure used for pattern-specific variables. */
103 struct pattern_var
105 struct pattern_var *next;
106 const char *suffix;
107 const char *target;
108 unsigned int len;
109 struct variable variable;
112 extern char *variable_buffer;
113 extern struct variable_set_list *current_variable_set_list;
114 extern struct variable *default_goal_var;
116 /* expand.c */
117 char *variable_buffer_output (char *ptr, const char *string, unsigned int length);
118 char *variable_expand (const char *line);
119 char *variable_expand_for_file (const char *line, struct file *file);
120 char *allocated_variable_expand_for_file (const char *line, struct file *file);
121 #define allocated_variable_expand(line) \
122 allocated_variable_expand_for_file (line, (struct file *) 0)
123 char *expand_argument (const char *str, const char *end);
124 char *variable_expand_string (char *line, const char *string, long length);
125 void install_variable_buffer (char **bufp, unsigned int *lenp);
126 void restore_variable_buffer (char *buf, unsigned int len);
128 /* function.c */
129 int handle_function (char **op, const char **stringp);
130 int pattern_matches (const char *pattern, const char *percent, const char *str);
131 char *subst_expand (char *o, const char *text, const char *subst,
132 const char *replace, unsigned int slen, unsigned int rlen,
133 int by_word);
134 char *patsubst_expand_pat (char *o, const char *text, const char *pattern,
135 const char *replace, const char *pattern_percent,
136 const char *replace_percent);
137 char *patsubst_expand (char *o, const char *text, char *pattern, char *replace);
138 char *func_shell_base (char *o, char **argv, int trim_newlines);
141 /* expand.c */
142 char *recursively_expand_for_file (struct variable *v, struct file *file);
143 #define recursively_expand(v) recursively_expand_for_file (v, NULL)
145 /* variable.c */
146 struct variable_set_list *create_new_variable_set (void);
147 void free_variable_set (struct variable_set_list *);
148 struct variable_set_list *push_new_variable_scope (void);
149 void pop_variable_scope (void);
150 void define_automatic_variables (void);
151 void initialize_file_variables (struct file *file, int reading);
152 void print_file_variables (const struct file *file);
153 void print_file_variables (const struct file *file);
154 void print_target_variables (const struct file *file);
155 void merge_variable_set_lists (struct variable_set_list **to_list,
156 struct variable_set_list *from_list);
157 struct variable *do_variable_definition (const struct floc *flocp,
158 const char *name, const char *value,
159 enum variable_origin origin,
160 enum variable_flavor flavor,
161 int target_var);
162 char *parse_variable_definition (const char *line,
163 enum variable_flavor *flavor);
164 struct variable *assign_variable_definition (struct variable *v, char *line);
165 struct variable *try_variable_definition (const struct floc *flocp, char *line,
166 enum variable_origin origin,
167 int target_var);
168 void init_hash_global_variable_set (void);
169 void hash_init_function_table (void);
170 struct variable *lookup_variable (const char *name, unsigned int length);
171 struct variable *lookup_variable_in_set (const char *name, unsigned int length,
172 const struct variable_set *set);
174 struct variable *define_variable_in_set (const char *name, unsigned int length,
175 const char *value,
176 enum variable_origin origin,
177 int recursive,
178 struct variable_set *set,
179 const struct floc *flocp);
181 /* Define a variable in the current variable set. */
183 #define define_variable(n,l,v,o,r) \
184 define_variable_in_set((n),(l),(v),(o),(r),\
185 current_variable_set_list->set,NILF)
187 /* Define a variable with a constant name in the current variable set. */
189 #define define_variable_cname(n,v,o,r) \
190 define_variable_in_set((n),(sizeof (n) - 1),(v),(o),(r),\
191 current_variable_set_list->set,NILF)
193 /* Define a variable with a location in the current variable set. */
195 #define define_variable_loc(n,l,v,o,r,f) \
196 define_variable_in_set((n),(l),(v),(o),(r),\
197 current_variable_set_list->set,(f))
199 /* Define a variable with a location in the global variable set. */
201 #define define_variable_global(n,l,v,o,r,f) \
202 define_variable_in_set((n),(l),(v),(o),(r),NULL,(f))
204 /* Define a variable in FILE's variable set. */
206 #define define_variable_for_file(n,l,v,o,r,f) \
207 define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF)
209 void undefine_variable_in_set (const char *name, unsigned int length,
210 enum variable_origin origin,
211 struct variable_set *set);
213 /* Remove variable from the current variable set. */
215 #define undefine_variable_global(n,l,o) \
216 undefine_variable_in_set((n),(l),(o),NULL)
218 /* Warn that NAME is an undefined variable. */
220 #define warn_undefined(n,l) do{\
221 if (warn_undefined_variables_flag) \
222 error (reading_file, \
223 _("warning: undefined variable `%.*s'"), \
224 (int)(l), (n)); \
225 }while(0)
227 char **target_environment (struct file *file);
229 struct pattern_var *create_pattern_var (const char *target,
230 const char *suffix);
232 extern int export_all_variables;
234 #define MAKELEVEL_NAME "MAKELEVEL"
235 #define MAKELEVEL_LENGTH (sizeof (MAKELEVEL_NAME) - 1)