1 /* Definition of target file data structures for 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 Free Software 4 Foundation, Inc. 5 This file is part of GNU Make. 6 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 2, or (at your option) any later version. 10 11 GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 13 A PARTICULAR PURPOSE. See the GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License along with 16 GNU Make; see the file COPYING. If not, write to the Free Software 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */ 18 19 20 /* Structure that represents the info on one file 21 that the makefile says how to make. 22 All of these are chained together through `next'. */ 23 24 #include "hash.h" 25 26 struct file 27 { 28 char *name; 29 char *hname; /* Hashed filename */ 30 char *vpath; /* VPATH/vpath pathname */ 31 struct dep *deps; /* all dependencies, including duplicates */ 32 struct commands *cmds; /* Commands to execute for this target. */ 33 int command_flags; /* Flags OR'd in for cmds; see commands.h. */ 34 char *stem; /* Implicit stem, if an implicit 35 rule has been used */ 36 struct dep *also_make; /* Targets that are made by making this. */ 37 FILE_TIMESTAMP last_mtime; /* File's modtime, if already known. */ 38 FILE_TIMESTAMP mtime_before_update; /* File's modtime before any updating 39 has been performed. */ 40 struct file *prev; /* Previous entry for same file name; 41 used when there are multiple double-colon 42 entries for the same file. */ 43 struct file *last; /* Last entry for the same file name. */ 44 45 /* File that this file was renamed to. After any time that a 46 file could be renamed, call `check_renamed' (below). */ 47 struct file *renamed; 48 49 /* List of variable sets used for this file. */ 50 struct variable_set_list *variables; 51 52 /* Pattern-specific variable reference for this target, or null if there 53 isn't one. Also see the pat_searched flag, below. */ 54 struct variable_set_list *pat_variables; 55 56 /* Immediate dependent that caused this target to be remade, 57 or nil if there isn't one. */ 58 struct file *parent; 59 60 /* For a double-colon entry, this is the first double-colon entry for 61 the same file. Otherwise this is null. */ 62 struct file *double_colon; 63 64 short int update_status; /* Status of the last attempt to update, 65 or -1 if none has been made. */ 66 67 enum cmd_state /* State of the commands. */ 68 { /* Note: It is important that cs_not_started be zero. */ 69 cs_not_started, /* Not yet started. */ 70 cs_deps_running, /* Dep commands running. */ 71 cs_running, /* Commands running. */ 72 cs_finished /* Commands finished. */ 73 } command_state ENUM_BITFIELD (2); 74 75 unsigned int precious:1; /* Non-0 means don't delete file on quit */ 76 unsigned int low_resolution_time:1; /* Nonzero if this file's time stamp 77 has only one-second resolution. */ 78 unsigned int tried_implicit:1; /* Nonzero if have searched 79 for implicit rule for making 80 this file; don't search again. */ 81 unsigned int updating:1; /* Nonzero while updating deps of this file */ 82 unsigned int updated:1; /* Nonzero if this file has been remade. */ 83 unsigned int is_target:1; /* Nonzero if file is described as target. */ 84 unsigned int cmd_target:1; /* Nonzero if file was given on cmd line. */ 85 unsigned int phony:1; /* Nonzero if this is a phony file 86 i.e., a prerequisite of .PHONY. */ 87 unsigned int intermediate:1;/* Nonzero if this is an intermediate file. */ 88 unsigned int secondary:1; /* Nonzero means remove_intermediates should 89 not delete it. */ 90 unsigned int dontcare:1; /* Nonzero if no complaint is to be made if 91 this target cannot be remade. */ 92 unsigned int ignore_vpath:1;/* Nonzero if we threw out VPATH name. */ 93 unsigned int pat_searched:1;/* Nonzero if we already searched for 94 pattern-specific variables. */ 95 unsigned int considered:1; /* equal to 'considered' if file has been 96 considered on current scan of goal chain */ 97 }; 98 99 100 extern struct file *default_goal_file, *suffix_file, *default_file; 101 extern char **default_goal_name; 102 103 104 extern struct file *lookup_file PARAMS ((char *name)); 105 extern struct file *enter_file PARAMS ((char *name)); 106 extern struct dep *parse_prereqs PARAMS ((char *prereqs)); 107 extern void remove_intermediates PARAMS ((int sig)); 108 extern void snap_deps PARAMS ((void)); 109 extern void rename_file PARAMS ((struct file *file, char *name)); 110 extern void rehash_file PARAMS ((struct file *file, char *name)); 111 extern void set_command_state PARAMS ((struct file *file, enum cmd_state state)); 112 extern void notice_finished_file PARAMS ((struct file *file)); 113 extern void init_hash_files PARAMS ((void)); 114 extern char *build_target_list PARAMS ((char *old_list)); 115 116 #if FILE_TIMESTAMP_HI_RES 117 # define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \ 118 file_timestamp_cons (fname, (st).st_mtime, (st).st_mtim.ST_MTIM_NSEC) 119 #else 120 # define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \ 121 file_timestamp_cons (fname, (st).st_mtime, 0) 122 #endif 123 124 /* If FILE_TIMESTAMP is 64 bits (or more), use nanosecond resolution. 125 (Multiply by 2**30 instead of by 10**9 to save time at the cost of 126 slightly decreasing the number of available timestamps.) With 127 64-bit FILE_TIMESTAMP, this stops working on 2514-05-30 01:53:04 128 UTC, but by then uintmax_t should be larger than 64 bits. */ 129 #define FILE_TIMESTAMPS_PER_S (FILE_TIMESTAMP_HI_RES ? 1000000000 : 1) 130 #define FILE_TIMESTAMP_LO_BITS (FILE_TIMESTAMP_HI_RES ? 30 : 0) 131 132 #define FILE_TIMESTAMP_S(ts) (((ts) - ORDINARY_MTIME_MIN) \ 133 >> FILE_TIMESTAMP_LO_BITS) 134 #define FILE_TIMESTAMP_NS(ts) ((int) (((ts) - ORDINARY_MTIME_MIN) \ 135 & ((1 << FILE_TIMESTAMP_LO_BITS) - 1))) 136 137 /* Upper bound on length of string "YYYY-MM-DD HH:MM:SS.NNNNNNNNN" 138 representing a file timestamp. The upper bound is not necessarily 19, 139 since the year might be less than -999 or greater than 9999. 140 141 Subtract one for the sign bit if in case file timestamps can be negative; 142 subtract FLOOR_LOG2_SECONDS_PER_YEAR to yield an upper bound on how many 143 file timestamp bits might affect the year; 144 302 / 1000 is log10 (2) rounded up; 145 add one for integer division truncation; 146 add one more for a minus sign if file timestamps can be negative; 147 add 4 to allow for any 4-digit epoch year (e.g. 1970); 148 add 25 to allow for "-MM-DD HH:MM:SS.NNNNNNNNN". */ 149 #define FLOOR_LOG2_SECONDS_PER_YEAR 24 150 #define FILE_TIMESTAMP_PRINT_LEN_BOUND \ 151 (((sizeof (FILE_TIMESTAMP) * CHAR_BIT - 1 - FLOOR_LOG2_SECONDS_PER_YEAR) \ 152 * 302 / 1000) \ 153 + 1 + 1 + 4 + 25) 154 155 extern FILE_TIMESTAMP file_timestamp_cons PARAMS ((char const *, 156 time_t, int)); 157 extern FILE_TIMESTAMP file_timestamp_now PARAMS ((int *)); 158 extern void file_timestamp_sprintf PARAMS ((char *p, FILE_TIMESTAMP ts)); 159 160 /* Return the mtime of file F (a struct file *), caching it. 161 The value is NONEXISTENT_MTIME if the file does not exist. */ 162 #define file_mtime(f) file_mtime_1 ((f), 1) 163 /* Return the mtime of file F (a struct file *), caching it. 164 Don't search using vpath for the file--if it doesn't actually exist, 165 we don't find it. 166 The value is NONEXISTENT_MTIME if the file does not exist. */ 167 #define file_mtime_no_search(f) file_mtime_1 ((f), 0) 168 extern FILE_TIMESTAMP f_mtime PARAMS ((struct file *file, int search)); 169 #define file_mtime_1(f, v) \ 170 ((f)->last_mtime == UNKNOWN_MTIME ? f_mtime ((f), v) : (f)->last_mtime) 171 172 /* Special timestamp values. */ 173 174 /* The file's timestamp is not yet known. */ 175 #define UNKNOWN_MTIME 0 176 177 /* The file does not exist. */ 178 #define NONEXISTENT_MTIME 1 179 180 /* The file does not exist, and we assume that it is older than any 181 actual file. */ 182 #define OLD_MTIME 2 183 184 /* The smallest and largest ordinary timestamps. */ 185 #define ORDINARY_MTIME_MIN (OLD_MTIME + 1) 186 #define ORDINARY_MTIME_MAX ((FILE_TIMESTAMP_S (NEW_MTIME) \ 187 << FILE_TIMESTAMP_LO_BITS) \ 188 + ORDINARY_MTIME_MIN + FILE_TIMESTAMPS_PER_S - 1) 189 190 /* Modtime value to use for `infinitely new'. We used to get the current time 191 from the system and use that whenever we wanted `new'. But that causes 192 trouble when the machine running make and the machine holding a file have 193 different ideas about what time it is; and can also lose for `force' 194 targets, which need to be considered newer than anything that depends on 195 them, even if said dependents' modtimes are in the future. */ 196 #define NEW_MTIME INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP) 197 198 #define check_renamed(file) \ 199 while ((file)->renamed != 0) (file) = (file)->renamed /* No ; here. */ 200 201 /* Have we snapped deps yet? */ 202 extern int snapped_deps; 203