| 1 | /* Definitions for using variables in GNU Make.
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| 2 | Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
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| 3 | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software
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| 4 | Foundation, Inc.
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| 5 | This file is part of GNU Make.
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| 6 |
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| 7 | GNU Make is free software; you can redistribute it and/or modify it under the
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| 8 | terms of the GNU General Public License as published by the Free Software
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| 9 | Foundation; either version 2, or (at your option) any later version.
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| 10 |
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| 11 | GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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| 12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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| 13 | A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License along with
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| 16 | GNU Make; see the file COPYING. If not, write to the Free Software
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| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
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| 18 |
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| 19 | #include "hash.h"
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| 20 |
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| 21 | /* Codes in a variable definition saying where the definition came from.
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| 22 | Increasing numeric values signify less-overridable definitions. */
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| 23 | enum variable_origin
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| 24 | {
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| 25 | o_default, /* Variable from the default set. */
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| 26 | o_env, /* Variable from environment. */
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| 27 | o_file, /* Variable given in a makefile. */
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| 28 | o_env_override, /* Variable from environment, if -e. */
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| 29 | o_command, /* Variable given by user. */
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| 30 | o_override, /* Variable from an `override' directive. */
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| 31 | o_automatic, /* Automatic variable -- cannot be set. */
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| 32 | o_invalid /* Core dump time. */
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| 33 | };
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| 34 |
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| 35 | enum variable_flavor
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| 36 | {
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| 37 | f_bogus, /* Bogus (error) */
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| 38 | f_simple, /* Simple definition (:=) */
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| 39 | f_recursive, /* Recursive definition (=) */
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| 40 | f_append, /* Appending definition (+=) */
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| 41 | f_conditional /* Conditional definition (?=) */
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| 42 | };
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| 43 |
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| 44 | /* Structure that represents one variable definition.
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| 45 | Each bucket of the hash table is a chain of these,
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| 46 | chained through `next'. */
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| 47 |
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| 48 | #define EXP_COUNT_BITS 15 /* This gets all the bitfields into 32 bits */
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| 49 | #define EXP_COUNT_MAX ((1<<EXP_COUNT_BITS)-1)
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| 50 |
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| 51 | struct variable
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| 52 | {
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| 53 | char *name; /* Variable name. */
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| 54 | int length; /* strlen (name) */
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| 55 | #ifdef VARIABLE_HASH /* bird */
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| 56 | int hash1; /* the primary hash */
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| 57 | int hash2; /* the secondary hash */
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| 58 | #endif
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| 59 | char *value; /* Variable value. */
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| 60 | struct floc fileinfo; /* Where the variable was defined. */
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| 61 | unsigned int recursive:1; /* Gets recursively re-evaluated. */
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| 62 | unsigned int append:1; /* Nonzero if an appending target-specific
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| 63 | variable. */
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| 64 | unsigned int conditional:1; /* Nonzero if set with a ?=. */
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| 65 | unsigned int per_target:1; /* Nonzero if a target-specific variable. */
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| 66 | unsigned int special:1; /* Nonzero if this is a special variable. */
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| 67 | unsigned int exportable:1; /* Nonzero if the variable _could_ be
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| 68 | exported. */
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| 69 | unsigned int expanding:1; /* Nonzero if currently being expanded. */
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| 70 | unsigned int exp_count:EXP_COUNT_BITS;
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| 71 | /* If >1, allow this many self-referential
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| 72 | expansions. */
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| 73 | enum variable_flavor
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| 74 | flavor ENUM_BITFIELD (3); /* Variable flavor. */
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| 75 | enum variable_origin
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| 76 | origin ENUM_BITFIELD (3); /* Variable origin. */
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| 77 | enum variable_export
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| 78 | {
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| 79 | v_export, /* Export this variable. */
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| 80 | v_noexport, /* Don't export this variable. */
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| 81 | v_ifset, /* Export it if it has a non-default value. */
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| 82 | v_default /* Decide in target_environment. */
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| 83 | } export ENUM_BITFIELD (2);
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| 84 | };
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| 85 |
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| 86 | /* Structure that represents a variable set. */
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| 87 |
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| 88 | struct variable_set
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| 89 | {
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| 90 | struct hash_table table; /* Hash table of variables. */
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| 91 | };
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| 92 |
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| 93 | /* Structure that represents a list of variable sets. */
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| 94 |
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| 95 | struct variable_set_list
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| 96 | {
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| 97 | struct variable_set_list *next; /* Link in the chain. */
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| 98 | struct variable_set *set; /* Variable set. */
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| 99 | };
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| 100 |
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| 101 | /* Structure used for pattern-specific variables. */
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| 102 |
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| 103 | struct pattern_var
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| 104 | {
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| 105 | struct pattern_var *next;
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| 106 | char *target;
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| 107 | unsigned int len;
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| 108 | char *suffix;
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| 109 | struct variable variable;
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| 110 | };
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| 111 |
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| 112 | extern char *variable_buffer;
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| 113 | extern struct variable_set_list *current_variable_set_list;
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| 114 |
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| 115 | /* expand.c */
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| 116 | extern char *variable_buffer_output PARAMS ((char *ptr, char *string, unsigned int length));
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| 117 | extern char *variable_expand PARAMS ((char *line));
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| 118 | extern char *variable_expand_for_file PARAMS ((char *line, struct file *file));
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| 119 | extern char *allocated_variable_expand_for_file PARAMS ((char *line, struct file *file));
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| 120 | #define allocated_variable_expand(line) \
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| 121 | allocated_variable_expand_for_file (line, (struct file *) 0)
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| 122 | extern char *expand_argument PARAMS ((const char *str, const char *end));
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| 123 | extern char *variable_expand_string PARAMS ((char *line, char *string,
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| 124 | long length));
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| 125 | extern void install_variable_buffer PARAMS ((char **bufp, unsigned int *lenp));
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| 126 | extern void restore_variable_buffer PARAMS ((char *buf, unsigned int len));
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| 127 |
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| 128 | /* function.c */
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| 129 | extern int handle_function PARAMS ((char **op, char **stringp));
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| 130 | extern int pattern_matches PARAMS ((char *pattern, char *percent, char *str));
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| 131 | extern char *subst_expand PARAMS ((char *o, char *text, char *subst, char *replace,
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| 132 | unsigned int slen, unsigned int rlen, int by_word));
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| 133 | extern char *patsubst_expand PARAMS ((char *o, char *text, char *pattern, char *replace,
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| 134 | char *pattern_percent, char *replace_percent));
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| 135 |
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| 136 | /* expand.c */
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| 137 | extern char *recursively_expand_for_file PARAMS ((struct variable *v,
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| 138 | struct file *file));
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| 139 | #define recursively_expand(v) recursively_expand_for_file (v, NULL)
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| 140 |
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| 141 | /* variable.c */
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| 142 | extern struct variable_set_list *create_new_variable_set PARAMS ((void));
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| 143 | extern void free_variable_set PARAMS ((struct variable_set_list *));
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| 144 | extern struct variable_set_list *push_new_variable_scope PARAMS ((void));
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| 145 | extern void pop_variable_scope PARAMS ((void));
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| 146 | extern void define_automatic_variables PARAMS ((void));
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| 147 | extern void initialize_file_variables PARAMS ((struct file *file, int read));
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| 148 | extern void print_file_variables PARAMS ((struct file *file));
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| 149 | extern void print_variable_set PARAMS ((struct variable_set *set, char *prefix));
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| 150 | extern void merge_variable_set_lists PARAMS ((struct variable_set_list **to_list, struct variable_set_list *from_list));
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| 151 | 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));
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| 152 | extern struct variable *parse_variable_definition PARAMS ((struct variable *v, char *line));
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| 153 | extern struct variable *try_variable_definition PARAMS ((const struct floc *flocp, char *line, enum variable_origin origin, int target_var));
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| 154 | extern void init_hash_global_variable_set PARAMS ((void));
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| 155 | extern void hash_init_function_table PARAMS ((void));
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| 156 | extern struct variable *lookup_variable PARAMS ((const char *name, unsigned int length));
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| 157 | extern struct variable *lookup_variable_in_set PARAMS ((const char *name,
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| 158 | unsigned int length,
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| 159 | const struct variable_set *set));
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| 160 |
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| 161 | extern struct variable *define_variable_in_set
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| 162 | PARAMS ((const char *name, unsigned int length, char *value,
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| 163 | enum variable_origin origin, int recursive,
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| 164 | struct variable_set *set, const struct floc *flocp));
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| 165 |
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| 166 | /* Define a variable in the current variable set. */
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| 167 |
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| 168 | #define define_variable(n,l,v,o,r) \
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| 169 | define_variable_in_set((n),(l),(v),(o),(r),\
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| 170 | current_variable_set_list->set,NILF)
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| 171 |
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| 172 | /* Define a variable with a location in the current variable set. */
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| 173 |
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| 174 | #define define_variable_loc(n,l,v,o,r,f) \
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| 175 | define_variable_in_set((n),(l),(v),(o),(r),\
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| 176 | current_variable_set_list->set,(f))
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| 177 |
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| 178 | /* Define a variable with a location in the global variable set. */
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| 179 |
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| 180 | #define define_variable_global(n,l,v,o,r,f) \
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| 181 | define_variable_in_set((n),(l),(v),(o),(r),NULL,(f))
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| 182 |
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| 183 | /* Define a variable in FILE's variable set. */
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| 184 |
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| 185 | #define define_variable_for_file(n,l,v,o,r,f) \
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| 186 | define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF)
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| 187 |
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| 188 | /* Warn that NAME is an undefined variable. */
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| 189 |
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| 190 | #define warn_undefined(n,l) do{\
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| 191 | if (warn_undefined_variables_flag) \
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| 192 | error (reading_file, \
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| 193 | _("warning: undefined variable `%.*s'"), \
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| 194 | (int)(l), (n)); \
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| 195 | }while(0)
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| 196 |
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| 197 | extern char **target_environment PARAMS ((struct file *file));
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| 198 |
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| 199 | extern struct pattern_var *create_pattern_var PARAMS ((char *target, char *suffix));
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| 200 |
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| 201 | extern int export_all_variables;
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| 202 |
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| 203 | #define MAKELEVEL_NAME "MAKELEVEL"
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| 204 | #define MAKELEVEL_LENGTH (sizeof (MAKELEVEL_NAME) - 1)
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