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236 lines
10 KiB
C
236 lines
10 KiB
C
/* Definitions for using variables in GNU Make.
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Copyright (C) 1988-2013 Free Software Foundation, Inc.
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This file is part of GNU Make.
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GNU Make is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3 of the License, or (at your option) any later
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version.
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GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "hash.h"
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/* Codes in a variable definition saying where the definition came from.
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Increasing numeric values signify less-overridable definitions. */
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enum variable_origin
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{
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o_default, /* Variable from the default set. */
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o_env, /* Variable from environment. */
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o_file, /* Variable given in a makefile. */
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o_env_override, /* Variable from environment, if -e. */
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o_command, /* Variable given by user. */
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o_override, /* Variable from an 'override' directive. */
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o_automatic, /* Automatic variable -- cannot be set. */
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o_invalid /* Core dump time. */
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};
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enum variable_flavor
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{
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f_bogus, /* Bogus (error) */
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f_simple, /* Simple definition (:= or ::=) */
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f_recursive, /* Recursive definition (=) */
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f_append, /* Appending definition (+=) */
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f_conditional, /* Conditional definition (?=) */
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f_shell /* Shell assignment (!=) */
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};
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/* Structure that represents one variable definition.
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Each bucket of the hash table is a chain of these,
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chained through 'next'. */
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#define EXP_COUNT_BITS 15 /* This gets all the bitfields into 32 bits */
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#define EXP_COUNT_MAX ((1<<EXP_COUNT_BITS)-1)
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struct variable
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{
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char *name; /* Variable name. */
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char *value; /* Variable value. */
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gmk_floc fileinfo; /* Where the variable was defined. */
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int length; /* strlen (name) */
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unsigned int recursive:1; /* Gets recursively re-evaluated. */
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unsigned int append:1; /* Nonzero if an appending target-specific
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variable. */
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unsigned int conditional:1; /* Nonzero if set with a ?=. */
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unsigned int per_target:1; /* Nonzero if a target-specific variable. */
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unsigned int special:1; /* Nonzero if this is a special variable. */
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unsigned int exportable:1; /* Nonzero if the variable _could_ be
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exported. */
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unsigned int expanding:1; /* Nonzero if currently being expanded. */
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unsigned int private_var:1; /* Nonzero avoids inheritance of this
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target-specific variable. */
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unsigned int exp_count:EXP_COUNT_BITS;
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/* If >1, allow this many self-referential
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expansions. */
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enum variable_flavor
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flavor ENUM_BITFIELD (3); /* Variable flavor. */
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enum variable_origin
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origin ENUM_BITFIELD (3); /* Variable origin. */
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enum variable_export
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{
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v_export, /* Export this variable. */
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v_noexport, /* Don't export this variable. */
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v_ifset, /* Export it if it has a non-default value. */
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v_default /* Decide in target_environment. */
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} export ENUM_BITFIELD (2);
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};
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/* Structure that represents a variable set. */
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struct variable_set
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{
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struct hash_table table; /* Hash table of variables. */
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};
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/* Structure that represents a list of variable sets. */
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struct variable_set_list
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{
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struct variable_set_list *next; /* Link in the chain. */
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struct variable_set *set; /* Variable set. */
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int next_is_parent; /* True if next is a parent target. */
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};
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/* Structure used for pattern-specific variables. */
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struct pattern_var
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{
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struct pattern_var *next;
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const char *suffix;
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const char *target;
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unsigned int len;
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struct variable variable;
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};
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extern char *variable_buffer;
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extern struct variable_set_list *current_variable_set_list;
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extern struct variable *default_goal_var;
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/* expand.c */
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char *variable_buffer_output (char *ptr, const char *string, unsigned int length);
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char *variable_expand (const char *line);
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char *variable_expand_for_file (const char *line, struct file *file);
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char *allocated_variable_expand_for_file (const char *line, struct file *file);
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#define allocated_variable_expand(line) \
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allocated_variable_expand_for_file (line, (struct file *) 0)
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char *expand_argument (const char *str, const char *end);
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char *variable_expand_string (char *line, const char *string, long length);
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void install_variable_buffer (char **bufp, unsigned int *lenp);
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void restore_variable_buffer (char *buf, unsigned int len);
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/* function.c */
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int handle_function (char **op, const char **stringp);
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int pattern_matches (const char *pattern, const char *percent, const char *str);
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char *subst_expand (char *o, const char *text, const char *subst,
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const char *replace, unsigned int slen, unsigned int rlen,
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int by_word);
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char *patsubst_expand_pat (char *o, const char *text, const char *pattern,
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const char *replace, const char *pattern_percent,
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const char *replace_percent);
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char *patsubst_expand (char *o, const char *text, char *pattern, char *replace);
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char *func_shell_base (char *o, char **argv, int trim_newlines);
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/* expand.c */
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char *recursively_expand_for_file (struct variable *v, struct file *file);
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#define recursively_expand(v) recursively_expand_for_file (v, NULL)
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/* variable.c */
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struct variable_set_list *create_new_variable_set (void);
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void free_variable_set (struct variable_set_list *);
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struct variable_set_list *push_new_variable_scope (void);
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void pop_variable_scope (void);
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void define_automatic_variables (void);
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void initialize_file_variables (struct file *file, int reading);
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void print_file_variables (const struct file *file);
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void print_file_variables (const struct file *file);
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void print_target_variables (const struct file *file);
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void merge_variable_set_lists (struct variable_set_list **to_list,
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struct variable_set_list *from_list);
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struct variable *do_variable_definition (const gmk_floc *flocp,
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const char *name, const char *value,
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enum variable_origin origin,
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enum variable_flavor flavor,
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int target_var);
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char *parse_variable_definition (const char *line,
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struct variable *v);
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struct variable *assign_variable_definition (struct variable *v, const char *line);
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struct variable *try_variable_definition (const gmk_floc *flocp, const char *line,
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enum variable_origin origin,
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int target_var);
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void init_hash_global_variable_set (void);
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void hash_init_function_table (void);
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void define_new_function(const gmk_floc *flocp, const char *name,
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unsigned int min, unsigned int max, unsigned int flags,
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gmk_func_ptr func);
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struct variable *lookup_variable (const char *name, unsigned int length);
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struct variable *lookup_variable_in_set (const char *name, unsigned int length,
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const struct variable_set *set);
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struct variable *define_variable_in_set (const char *name, unsigned int length,
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const char *value,
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enum variable_origin origin,
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int recursive,
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struct variable_set *set,
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const gmk_floc *flocp);
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/* Define a variable in the current variable set. */
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#define define_variable(n,l,v,o,r) \
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define_variable_in_set((n),(l),(v),(o),(r),\
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current_variable_set_list->set,NILF)
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/* Define a variable with a constant name in the current variable set. */
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#define define_variable_cname(n,v,o,r) \
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define_variable_in_set((n),(sizeof (n) - 1),(v),(o),(r),\
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current_variable_set_list->set,NILF)
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/* Define a variable with a location in the current variable set. */
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#define define_variable_loc(n,l,v,o,r,f) \
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define_variable_in_set((n),(l),(v),(o),(r),\
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current_variable_set_list->set,(f))
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/* Define a variable with a location in the global variable set. */
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#define define_variable_global(n,l,v,o,r,f) \
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define_variable_in_set((n),(l),(v),(o),(r),NULL,(f))
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/* Define a variable in FILE's variable set. */
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#define define_variable_for_file(n,l,v,o,r,f) \
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define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF)
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void undefine_variable_in_set (const char *name, unsigned int length,
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enum variable_origin origin,
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struct variable_set *set);
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/* Remove variable from the current variable set. */
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#define undefine_variable_global(n,l,o) \
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undefine_variable_in_set((n),(l),(o),NULL)
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/* Warn that NAME is an undefined variable. */
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#define warn_undefined(n,l) do{\
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if (warn_undefined_variables_flag) \
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error (reading_file, (l), \
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_("warning: undefined variable '%.*s'"), \
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(int)(l), (n)); \
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}while(0)
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char **target_environment (struct file *file);
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struct pattern_var *create_pattern_var (const char *target,
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const char *suffix);
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extern int export_all_variables;
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#define MAKELEVEL_NAME "MAKELEVEL"
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#define MAKELEVEL_LENGTH (CSTRLEN (MAKELEVEL_NAME))
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