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variable.h
236 строк
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Paul Smith
Simplify copyrights using ranges of years.
05 мар 2012, 18:10
05 мар 2012, 18:10
adb50bd
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/* Definitions for using variables in GNU Make. Copyright (C) 1988-2012 Free Software Foundation, Inc. This file is part of GNU Make. GNU Make is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "hash.h" /* Codes in a variable definition saying where the definition came from. Increasing numeric values signify less-overridable definitions. */ enum variable_origin { o_default, /* Variable from the default set. */ o_env, /* Variable from environment. */ o_file, /* Variable given in a makefile. */ o_env_override, /* Variable from environment, if -e. */ o_command, /* Variable given by user. */ o_override, /* Variable from an 'override' directive. */ o_automatic, /* Automatic variable -- cannot be set. */ o_invalid /* Core dump time. */ }; enum variable_flavor { f_bogus, /* Bogus (error) */ f_simple, /* Simple definition (:= or ::=) */ f_recursive, /* Recursive definition (=) */ f_append, /* Appending definition (+=) */ f_conditional, /* Conditional definition (?=) */ f_shell /* Shell assignment (!=) */ }; /* Structure that represents one variable definition. Each bucket of the hash table is a chain of these, chained through 'next'. */ #define EXP_COUNT_BITS 15 /* This gets all the bitfields into 32 bits */ #define EXP_COUNT_MAX ((1<<EXP_COUNT_BITS)-1) struct variable { char *name; /* Variable name. */ char *value; /* Variable value. */ struct floc fileinfo; /* Where the variable was defined. */ int length; /* strlen (name) */ unsigned int recursive:1; /* Gets recursively re-evaluated. */ unsigned int append:1; /* Nonzero if an appending target-specific variable. */ unsigned int conditional:1; /* Nonzero if set with a ?=. */ unsigned int per_target:1; /* Nonzero if a target-specific variable. */ unsigned int special:1; /* Nonzero if this is a special variable. */ unsigned int exportable:1; /* Nonzero if the variable _could_ be exported. */ unsigned int expanding:1; /* Nonzero if currently being expanded. */ unsigned int private_var:1; /* Nonzero avoids inheritance of this target-specific variable. */ unsigned int exp_count:EXP_COUNT_BITS; /* If >1, allow this many self-referential expansions. */ enum variable_flavor flavor ENUM_BITFIELD (3); /* Variable flavor. */ enum variable_origin origin ENUM_BITFIELD (3); /* Variable origin. */ enum variable_export { v_export, /* Export this variable. */ v_noexport, /* Don't export this variable. */ v_ifset, /* Export it if it has a non-default value. */ v_default /* Decide in target_environment. */ } export ENUM_BITFIELD (2); }; /* Structure that represents a variable set. */ struct variable_set { struct hash_table table; /* Hash table of variables. */ }; /* Structure that represents a list of variable sets. */ struct variable_set_list { struct variable_set_list *next; /* Link in the chain. */ struct variable_set *set; /* Variable set. */ int next_is_parent; /* True if next is a parent target. */ }; /* Structure used for pattern-specific variables. */ struct pattern_var { struct pattern_var *next; const char *suffix; const char *target; unsigned int len; struct variable variable; }; extern char *variable_buffer; extern struct variable_set_list *current_variable_set_list; extern struct variable *default_goal_var; /* expand.c */ char *variable_buffer_output (char *ptr, const char *string, unsigned int length); char *variable_expand (const char *line); char *variable_expand_for_file (const char *line, struct file *file); char *allocated_variable_expand_for_file (const char *line, struct file *file); #define allocated_variable_expand(line) \ allocated_variable_expand_for_file (line, (struct file *) 0) char *expand_argument (const char *str, const char *end); char *variable_expand_string (char *line, const char *string, long length); void install_variable_buffer (char **bufp, unsigned int *lenp); void restore_variable_buffer (char *buf, unsigned int len); /* function.c */ int handle_function (char **op, const char **stringp); int pattern_matches (const char *pattern, const char *percent, const char *str); char *subst_expand (char *o, const char *text, const char *subst, const char *replace, unsigned int slen, unsigned int rlen, int by_word); char *patsubst_expand_pat (char *o, const char *text, const char *pattern, const char *replace, const char *pattern_percent, const char *replace_percent); char *patsubst_expand (char *o, const char *text, char *pattern, char *replace); char *func_shell_base (char *o, char **argv, int trim_newlines); /* expand.c */ char *recursively_expand_for_file (struct variable *v, struct file *file); #define recursively_expand(v) recursively_expand_for_file (v, NULL) /* variable.c */ struct variable_set_list *create_new_variable_set (void); void free_variable_set (struct variable_set_list *); struct variable_set_list *push_new_variable_scope (void); void pop_variable_scope (void); void define_automatic_variables (void); void initialize_file_variables (struct file *file, int reading); void print_file_variables (const struct file *file); void print_file_variables (const struct file *file); void print_target_variables (const struct file *file); void merge_variable_set_lists (struct variable_set_list **to_list, struct variable_set_list *from_list); struct variable *do_variable_definition (const struct floc *flocp, const char *name, const char *value, enum variable_origin origin, enum variable_flavor flavor, int target_var); char *parse_variable_definition (const char *line, struct variable *v); struct variable *assign_variable_definition (struct variable *v, char *line); struct variable *try_variable_definition (const struct floc *flocp, char *line, enum variable_origin origin, int target_var); void init_hash_global_variable_set (void); void hash_init_function_table (void); void define_new_function(const struct floc *flocp, const char *name, int min, int max, int expand, char *(*func)(char *, char **, const char *)); struct variable *lookup_variable (const char *name, unsigned int length); struct variable *lookup_variable_in_set (const char *name, unsigned int length, const struct variable_set *set); struct variable *define_variable_in_set (const char *name, unsigned int length, const char *value, enum variable_origin origin, int recursive, struct variable_set *set, const struct floc *flocp); /* Define a variable in the current variable set. */ #define define_variable(n,l,v,o,r) \ define_variable_in_set((n),(l),(v),(o),(r),\ current_variable_set_list->set,NILF) /* Define a variable with a constant name in the current variable set. */ #define define_variable_cname(n,v,o,r) \ define_variable_in_set((n),(sizeof (n) - 1),(v),(o),(r),\ current_variable_set_list->set,NILF) /* Define a variable with a location in the current variable set. */ #define define_variable_loc(n,l,v,o,r,f) \ define_variable_in_set((n),(l),(v),(o),(r),\ current_variable_set_list->set,(f)) /* Define a variable with a location in the global variable set. */ #define define_variable_global(n,l,v,o,r,f) \ define_variable_in_set((n),(l),(v),(o),(r),NULL,(f)) /* Define a variable in FILE's variable set. */ #define define_variable_for_file(n,l,v,o,r,f) \ define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF) void undefine_variable_in_set (const char *name, unsigned int length, enum variable_origin origin, struct variable_set *set); /* Remove variable from the current variable set. */ #define undefine_variable_global(n,l,o) \ undefine_variable_in_set((n),(l),(o),NULL) /* Warn that NAME is an undefined variable. */ #define warn_undefined(n,l) do{\ if (warn_undefined_variables_flag) \ error (reading_file, \ _("warning: undefined variable '%.*s'"), \ (int)(l), (n)); \ }while(0) char **target_environment (struct file *file); struct pattern_var *create_pattern_var (const char *target, const char *suffix); extern int export_all_variables; #define MAKELEVEL_NAME "MAKELEVEL" #define MAKELEVEL_LENGTH (CSTRLEN (MAKELEVEL_NAME))