| 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 | #ifdef CONFIG_WITH_LOCAL_VARIABLES
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| 32 | o_local, /* Variable from an 'local' directive. */
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| 33 | #endif
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| 34 | o_automatic, /* Automatic variable -- cannot be set. */
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| 35 | o_invalid /* Core dump time. */
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| 36 | };
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| 37 |
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| 38 | enum variable_flavor
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| 39 | {
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| 40 | f_bogus, /* Bogus (error) */
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| 41 | f_simple, /* Simple definition (:=) */
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| 42 | f_recursive, /* Recursive definition (=) */
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| 43 | f_append, /* Appending definition (+=) */
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| 44 | #ifdef CONFIG_WITH_PREPEND_ASSIGNMENT
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| 45 | f_prepend, /* Prepending definition (>=) */
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| 46 | #endif
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| 47 | f_conditional /* Conditional definition (?=) */
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| 48 | };
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| 49 |
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| 50 | /* Structure that represents one variable definition.
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| 51 | Each bucket of the hash table is a chain of these,
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| 52 | chained through `next'. */
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| 53 |
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| 54 | #define EXP_COUNT_BITS 15 /* This gets all the bitfields into 32 bits */
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| 55 | #define EXP_COUNT_MAX ((1<<EXP_COUNT_BITS)-1)
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| 56 |
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| 57 | struct variable
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| 58 | {
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| 59 | #ifndef CONFIG_WITH_STRCACHE2
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| 60 | char *name; /* Variable name. */
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| 61 | #else
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| 62 | const char *name; /* Variable name (in varaible_strcache). */
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| 63 | #endif
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| 64 | int length; /* strlen (name) */
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| 65 | #ifdef CONFIG_WITH_VALUE_LENGTH
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| 66 | int value_length; /* The length of the value, usually unused. */
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| 67 | int value_alloc_len; /* The amount of memory we've actually allocated. */
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| 68 | /* FIXME: make lengths unsigned! */
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| 69 | #endif
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| 70 | char *value; /* Variable value. */
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| 71 | struct floc fileinfo; /* Where the variable was defined. */
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| 72 | unsigned int recursive:1; /* Gets recursively re-evaluated. */
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| 73 | unsigned int append:1; /* Nonzero if an appending target-specific
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| 74 | variable. */
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| 75 | unsigned int conditional:1; /* Nonzero if set with a ?=. */
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| 76 | unsigned int per_target:1; /* Nonzero if a target-specific variable. */
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| 77 | unsigned int special:1; /* Nonzero if this is a special variable. */
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| 78 | unsigned int exportable:1; /* Nonzero if the variable _could_ be
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| 79 | exported. */
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| 80 | unsigned int expanding:1; /* Nonzero if currently being expanded. */
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| 81 | unsigned int exp_count:EXP_COUNT_BITS;
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| 82 | /* If >1, allow this many self-referential
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| 83 | expansions. */
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| 84 | enum variable_flavor
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| 85 | flavor ENUM_BITFIELD (3); /* Variable flavor. */
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| 86 | enum variable_origin
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| 87 | #ifdef CONFIG_WITH_LOCAL_VARIABLES
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| 88 | origin ENUM_BITFIELD (4); /* Variable origin. */
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| 89 | #else
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| 90 | origin ENUM_BITFIELD (3); /* Variable origin. */
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| 91 | #endif
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| 92 | enum variable_export
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| 93 | {
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| 94 | v_export, /* Export this variable. */
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| 95 | v_noexport, /* Don't export this variable. */
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| 96 | v_ifset, /* Export it if it has a non-default value. */
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| 97 | v_default /* Decide in target_environment. */
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| 98 | } export ENUM_BITFIELD (2);
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| 99 | };
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| 100 |
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| 101 | /* Structure that represents a variable set. */
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| 102 |
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| 103 | struct variable_set
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| 104 | {
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| 105 | struct hash_table table; /* Hash table of variables. */
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| 106 | };
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| 107 |
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| 108 | /* Structure that represents a list of variable sets. */
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| 109 |
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| 110 | struct variable_set_list
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| 111 | {
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| 112 | struct variable_set_list *next; /* Link in the chain. */
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| 113 | struct variable_set *set; /* Variable set. */
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| 114 | };
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| 115 |
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| 116 | /* Structure used for pattern-specific variables. */
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| 117 |
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| 118 | struct pattern_var
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| 119 | {
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| 120 | struct pattern_var *next;
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| 121 | const char *suffix;
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| 122 | const char *target;
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| 123 | unsigned int len;
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| 124 | struct variable variable;
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| 125 | };
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| 126 |
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| 127 | extern char *variable_buffer;
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| 128 | extern struct variable_set_list *current_variable_set_list;
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| 129 | #ifdef KMK
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| 130 | extern unsigned int variable_buffer_length;
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| 131 | #define VARIABLE_BUFFER_ZONE 5
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| 132 | #endif
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| 133 |
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| 134 | /* expand.c */
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| 135 | #ifndef KMK
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| 136 | char *variable_buffer_output (char *ptr, const char *string, unsigned int length);
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| 137 | #else /* KMK */
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| 138 | /* Subroutine of variable_expand and friends:
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| 139 | The text to add is LENGTH chars starting at STRING to the variable_buffer.
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| 140 | The text is added to the buffer at PTR, and the updated pointer into
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| 141 | the buffer is returned as the value. Thus, the value returned by
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| 142 | each call to variable_buffer_output should be the first argument to
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| 143 | the following call. */
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| 144 |
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| 145 | __inline static char *
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| 146 | variable_buffer_output (char *ptr, const char *string, unsigned int length)
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| 147 | {
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| 148 | register unsigned int newlen = length + (ptr - variable_buffer);
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| 149 |
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| 150 | if ((newlen + VARIABLE_BUFFER_ZONE) > variable_buffer_length)
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| 151 | {
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| 152 | unsigned int offset = ptr - variable_buffer;
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| 153 | variable_buffer_length = variable_buffer_length <= 1024
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| 154 | ? 2048 : variable_buffer_length * 4;
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| 155 | if (variable_buffer_length < newlen + 100)
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| 156 | variable_buffer_length = (newlen + 100 + 1023) & ~1023U;
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| 157 | variable_buffer = xrealloc (variable_buffer, variable_buffer_length);
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| 158 | ptr = variable_buffer + offset;
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| 159 | }
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| 160 |
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| 161 | # ifndef _MSC_VER
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| 162 | switch (length)
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| 163 | {
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| 164 | case 4: ptr[3] = string[3];
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| 165 | case 3: ptr[2] = string[2];
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| 166 | case 2: ptr[1] = string[1];
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| 167 | case 1: ptr[0] = string[0];
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| 168 | case 0:
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| 169 | break;
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| 170 | default:
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| 171 | memcpy (ptr, string, length);
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| 172 | break;
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| 173 | }
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| 174 | # else
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| 175 | memcpy (ptr, string, length);
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| 176 | # endif
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| 177 | return ptr + length;
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| 178 | }
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| 179 |
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| 180 | #endif /* KMK */
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| 181 | char *variable_expand (const char *line);
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| 182 | char *variable_expand_for_file (const char *line, struct file *file);
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| 183 | #ifdef CONFIG_WITH_COMMANDS_FUNC
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| 184 | char *variable_expand_for_file_2 (char *o, const char *line, unsigned int lenght,
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| 185 | struct file *file, unsigned int *value_lenp);
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| 186 | #endif
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| 187 | char *allocated_variable_expand_for_file (const char *line, struct file *file);
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| 188 | #ifndef CONFIG_WITH_VALUE_LENGTH
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| 189 | #define allocated_variable_expand(line) \
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| 190 | allocated_variable_expand_for_file (line, (struct file *) 0)
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| 191 | #else /* CONFIG_WITH_VALUE_LENGTH */
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| 192 | # define allocated_variable_expand(line) \
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| 193 | allocated_variable_expand_2 (line, -1, NULL)
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| 194 | char *allocated_variable_expand_2 (const char *line, unsigned int length, unsigned int *value_lenp);
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| 195 | char *allocated_variable_expand_3 (const char *line, unsigned int length,
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| 196 | unsigned int *value_lenp, unsigned int *buffer_lengthp);
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| 197 | void recycle_variable_buffer (char *buffer, unsigned int length);
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| 198 | #endif /* CONFIG_WITH_VALUE_LENGTH */
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| 199 | char *expand_argument (const char *str, const char *end);
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| 200 | #ifndef CONFIG_WITH_VALUE_LENGTH
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| 201 | char *variable_expand_string (char *line, const char *string, long length);
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| 202 | #else /* CONFIG_WITH_VALUE_LENGTH */
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| 203 | char *variable_expand_string_2 (char *line, const char *string, long length, char **eol);
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| 204 | __inline static char *
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| 205 | variable_expand_string (char *line, const char *string, long length)
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| 206 | {
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| 207 | char *ignored;
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| 208 | return variable_expand_string_2 (line, string, length, &ignored);
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| 209 | }
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| 210 | #endif /* CONFIG_WITH_VALUE_LENGTH */
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| 211 | void install_variable_buffer (char **bufp, unsigned int *lenp);
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| 212 | void restore_variable_buffer (char *buf, unsigned int len);
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| 213 | #ifdef CONFIG_WITH_VALUE_LENGTH
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| 214 | void append_expanded_string_to_variable (struct variable *v, const char *value,
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| 215 | unsigned int value_len, int append);
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| 216 | #endif
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| 217 |
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| 218 | /* function.c */
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| 219 | #ifndef CONFIG_WITH_VALUE_LENGTH
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| 220 | int handle_function (char **op, const char **stringp);
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| 221 | #else
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| 222 | int handle_function (char **op, const char **stringp, const char *nameend, const char *eol);
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| 223 | #endif
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| 224 | int pattern_matches (const char *pattern, const char *percent, const char *str);
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| 225 | char *subst_expand (char *o, const char *text, const char *subst,
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| 226 | const char *replace, unsigned int slen, unsigned int rlen,
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| 227 | int by_word);
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| 228 | char *patsubst_expand_pat (char *o, const char *text, const char *pattern,
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| 229 | const char *replace, const char *pattern_percent,
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| 230 | const char *replace_percent);
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| 231 | char *patsubst_expand (char *o, const char *text, char *pattern, char *replace);
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| 232 | #ifdef CONFIG_WITH_COMMANDS_FUNC
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| 233 | char *func_commands (char *o, char **argv, const char *funcname);
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| 234 | #endif
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| 235 | #if defined (CONFIG_WITH_VALUE_LENGTH)
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| 236 | /* Avoid calling handle_function for every variable, do the
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| 237 | basic checks in variable_expand_string_2. */
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| 238 | extern char func_char_map[256];
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| 239 | # define MAX_FUNCTION_LENGTH 12
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| 240 | # define MIN_FUNCTION_LENGTH 2
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| 241 | MY_INLINE const char *
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| 242 | may_be_function_name (const char *name, const char *eos)
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| 243 | {
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| 244 | unsigned char ch;
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| 245 | unsigned int len = name - eos;
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| 246 |
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| 247 | /* Minimum length is MIN + whitespace. Check this directly.
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| 248 | ASSUMES: MIN_FUNCTION_LENGTH == 2 */
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| 249 |
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| 250 | if (MY_PREDICT_TRUE(len < MIN_FUNCTION_LENGTH + 1
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| 251 | || !func_char_map[(int)(name[0])]
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| 252 | || !func_char_map[(int)(name[1])]))
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| 253 | return 0;
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| 254 | if (MY_PREDICT_TRUE(!func_char_map[ch = name[2]]))
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| 255 | return isspace (ch) ? name + 2 : 0;
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| 256 |
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| 257 | name += 3;
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| 258 | if (len > MAX_FUNCTION_LENGTH)
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| 259 | len = MAX_FUNCTION_LENGTH - 3;
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| 260 | else if (len == 3)
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| 261 | len -= 3;
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| 262 | if (!len)
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| 263 | return 0;
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| 264 |
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| 265 | /* Loop over the remaining possiblities. */
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| 266 |
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| 267 | while (func_char_map[ch = *name])
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| 268 | {
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| 269 | if (!len--)
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| 270 | return 0;
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| 271 | name++;
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| 272 | }
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| 273 | if (ch == '\0' || isblank (ch))
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| 274 | return name;
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| 275 | return 0;
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| 276 | }
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| 277 | #endif /* CONFIG_WITH_VALUE_LENGTH */
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| 278 |
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| 279 | /* expand.c */
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| 280 | #ifndef CONFIG_WITH_VALUE_LENGTH
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| 281 | char *recursively_expand_for_file (struct variable *v, struct file *file);
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| 282 | #define recursively_expand(v) recursively_expand_for_file (v, NULL)
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| 283 | #else
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| 284 | char *recursively_expand_for_file (struct variable *v, struct file *file,
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| 285 | unsigned int *value_lenp);
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| 286 | #define recursively_expand(v) recursively_expand_for_file (v, NULL, NULL)
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| 287 | #endif
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| 288 |
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| 289 | /* variable.c */
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| 290 | struct variable_set_list *create_new_variable_set (void);
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| 291 | void free_variable_set (struct variable_set_list *);
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| 292 | struct variable_set_list *push_new_variable_scope (void);
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| 293 | void pop_variable_scope (void);
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| 294 | void define_automatic_variables (void);
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| 295 | void initialize_file_variables (struct file *file, int reading);
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| 296 | void print_file_variables (const struct file *file);
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| 297 | void print_variable_set (struct variable_set *set, char *prefix);
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| 298 | void merge_variable_set_lists (struct variable_set_list **to_list,
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| 299 | struct variable_set_list *from_list);
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| 300 | #ifndef CONFIG_WITH_VALUE_LENGTH
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| 301 | struct variable *do_variable_definition (const struct floc *flocp,
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| 302 | const char *name, const char *value,
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| 303 | enum variable_origin origin,
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| 304 | enum variable_flavor flavor,
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| 305 | int target_var);
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| 306 | struct variable *parse_variable_definition (struct variable *v, char *line);
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| 307 | struct variable *try_variable_definition (const struct floc *flocp, char *line,
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| 308 | enum variable_origin origin,
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| 309 | int target_var);
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| 310 | #else /* CONFIG_WITH_VALUE_LENGTH */
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| 311 | # define do_variable_definition(flocp, varname, value, origin, flavor, target_var) \
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| 312 | do_variable_definition_2 ((flocp), (varname), (value), ~0U, 0, NULL, \
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| 313 | (origin), (flavor), (target_var))
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| 314 |
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| 315 | struct variable *do_variable_definition_2 (const struct floc *flocp,
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| 316 | const char *varname,
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| 317 | const char *value,
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| 318 | unsigned int value_len,
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| 319 | int simple_value, char *free_value,
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| 320 | enum variable_origin origin,
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| 321 | enum variable_flavor flavor,
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| 322 | int target_var);
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| 323 | struct variable *parse_variable_definition (struct variable *v, char *line,
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| 324 | char *eos);
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| 325 | struct variable *try_variable_definition (const struct floc *flocp, char *line,
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| 326 | char *eos,
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| 327 | enum variable_origin origin,
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| 328 | int target_var);
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| 329 | #endif /* CONFIG_WITH_VALUE_LENGTH */
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| 330 | void init_hash_global_variable_set (void);
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| 331 | void hash_init_function_table (void);
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| 332 | struct variable *lookup_variable (const char *name, unsigned int length);
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| 333 | struct variable *lookup_variable_in_set (const char *name, unsigned int length,
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| 334 | const struct variable_set *set);
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| 335 |
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| 336 | #ifdef CONFIG_WITH_VALUE_LENGTH
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| 337 | void append_string_to_variable (struct variable *v, const char *value,
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| 338 | unsigned int value_len, int append);
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| 339 |
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| 340 | struct variable *define_variable_in_set (const char *name, unsigned int length,
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| 341 | const char *value,
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| 342 | unsigned int value_length,
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| 343 | int duplicate_value,
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| 344 | enum variable_origin origin,
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| 345 | int recursive,
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| 346 | struct variable_set *set,
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| 347 | const struct floc *flocp);
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| 348 |
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| 349 | /* Define a variable in the current variable set. */
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| 350 |
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| 351 | #define define_variable(n,l,v,o,r) \
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| 352 | define_variable_in_set((n),(l),(v),~0U,1,(o),(r),\
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| 353 | current_variable_set_list->set,NILF)
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| 354 |
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| 355 | #define define_variable_vl(n,l,v,vl,dv,o,r) \
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| 356 | define_variable_in_set((n),(l),(v),(vl),(dv),(o),(r),\
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| 357 | current_variable_set_list->set,NILF)
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| 358 |
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| 359 | /* Define a variable with a location in the current variable set. */
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| 360 |
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| 361 | #define define_variable_loc(n,l,v,o,r,f) \
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| 362 | define_variable_in_set((n),(l),(v),~0U,1,(o),(r),\
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| 363 | current_variable_set_list->set,(f))
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| 364 |
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| 365 | /* Define a variable with a location in the global variable set. */
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| 366 |
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| 367 | #define define_variable_global(n,l,v,o,r,f) \
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| 368 | define_variable_in_set((n),(l),(v),~0U,1,(o),(r),NULL,(f))
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| 369 |
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| 370 | #define define_variable_vl_global(n,l,v,vl,dv,o,r,f) \
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| 371 | define_variable_in_set((n),(l),(v),(vl),(dv),(o),(r),NULL,(f))
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| 372 |
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| 373 | /* Define a variable in FILE's variable set. */
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| 374 |
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| 375 | #define define_variable_for_file(n,l,v,o,r,f) \
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| 376 | define_variable_in_set((n),(l),(v),~0U,1,(o),(r),(f)->variables->set,NILF)
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| 377 |
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| 378 | #else /* !CONFIG_WITH_VALUE_LENGTH */
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| 379 |
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| 380 | struct variable *define_variable_in_set (const char *name, unsigned int length,
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| 381 | const char *value,
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| 382 | enum variable_origin origin,
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| 383 | int recursive,
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| 384 | struct variable_set *set,
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| 385 | const struct floc *flocp);
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| 386 |
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| 387 | /* Define a variable in the current variable set. */
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| 388 |
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| 389 | #define define_variable(n,l,v,o,r) \
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| 390 | define_variable_in_set((n),(l),(v),(o),(r),\
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| 391 | current_variable_set_list->set,NILF) /* force merge conflict */
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| 392 |
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| 393 | /* Define a variable with a location in the current variable set. */
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| 394 |
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| 395 | #define define_variable_loc(n,l,v,o,r,f) \
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| 396 | define_variable_in_set((n),(l),(v),(o),(r),\
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| 397 | current_variable_set_list->set,(f)) /* force merge conflict */
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| 398 |
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| 399 | /* Define a variable with a location in the global variable set. */
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| 400 |
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| 401 | #define define_variable_global(n,l,v,o,r,f) \
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| 402 | define_variable_in_set((n),(l),(v),(o),(r),NULL,(f)) /* force merge conflict */
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| 403 |
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| 404 | /* Define a variable in FILE's variable set. */
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| 405 |
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| 406 | #define define_variable_for_file(n,l,v,o,r,f) \
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| 407 | define_variable_in_set((n),(l),(v),(o),(r),(f)->variables->set,NILF) /* force merge conflict */
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| 408 |
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| 409 | #endif /* !CONFIG_WITH_VALUE_LENGTH */
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| 410 |
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| 411 | /* Warn that NAME is an undefined variable. */
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| 412 |
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| 413 | #define warn_undefined(n,l) do{\
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| 414 | if (warn_undefined_variables_flag) \
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| 415 | error (reading_file, \
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| 416 | _("warning: undefined variable `%.*s'"), \
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| 417 | (int)(l), (n)); \
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| 418 | }while(0)
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| 419 |
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| 420 | char **target_environment (struct file *file);
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| 421 |
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| 422 | struct pattern_var *create_pattern_var (const char *target,
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| 423 | const char *suffix);
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| 424 |
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| 425 | extern int export_all_variables;
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| 426 |
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| 427 | #ifdef KMK
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| 428 | # define MAKELEVEL_NAME "KMK_LEVEL"
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| 429 | #else
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| 430 | #define MAKELEVEL_NAME "MAKELEVEL"
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| 431 | #endif
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| 432 | #define MAKELEVEL_LENGTH (sizeof (MAKELEVEL_NAME) - 1)
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