filedef.h

   1 /* Definition of target file data structures for GNU Make.
   2 Copyright (C) 1988,89,90,91,92,93,94,97 Free Software Foundation, Inc.
   3 This file is part of GNU Make.
   4
   5 GNU Make is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU General Public License as published by
   7 the Free Software Foundation; either version 2, or (at your option)
   8 any later version.
   9
  10 GNU Make is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with GNU Make; see the file COPYING.  If not, write to
  17 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20
  21 /* Structure that represents the info on one file
  22    that the makefile says how to make.
  23    All of these are chained together through `next'.  */
  24
  25 struct file
  26   {
  27     struct file *next;
  28     char *name;
  29     char *hname;                /* Hashed filename */
  30     char *vpath;                /* VPATH/vpath pathname */
  31     struct dep *deps;
  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
  44     /* File that this file was renamed to.  After any time that a
  45        file could be renamed, call `check_renamed' (below).  */
  46     struct file *renamed;
  47
  48     /* List of variable sets used for this file.  */
  49     struct variable_set_list *variables;
  50
  51     /* Pattern-specific variable reference for this target, or null if there
  52        isn't one.  Also see the pat_searched flag, below.  */
  53     struct variable_set_list *pat_variables;
  54
  55     /* Immediate dependent that caused this target to be remade,
  56        or nil if there isn't one.  */
  57     struct file *parent;
  58
  59     /* For a double-colon entry, this is the first double-colon entry for
  60        the same file.  Otherwise this is null.  */
  61     struct file *double_colon;
  62
  63     short int update_status;    /* Status of the last attempt to update,
  64                                    or -1 if none has been made.  */
  65
  66     enum                        /* State of the commands.  */
  67       {         /* Note: It is important that cs_not_started be zero.  */
  68         cs_not_started,         /* Not yet started.  */
  69         cs_deps_running,        /* Dep commands running.  */
  70         cs_running,             /* Commands running.  */
  71         cs_finished             /* Commands finished.  */
  72       } command_state ENUM_BITFIELD (2);
  73
  74     unsigned int precious:1;    /* Non-0 means don't delete file on quit */
  75     unsigned int tried_implicit:1; /* Nonzero if have searched
  76                                       for implicit rule for making
  77                                       this file; don't search again.  */
  78     unsigned int updating:1;    /* Nonzero while updating deps of this file */
  79     unsigned int updated:1;     /* Nonzero if this file has been remade.  */
  80     unsigned int is_target:1;   /* Nonzero if file is described as target.  */
  81     unsigned int cmd_target:1;  /* Nonzero if file was given on cmd line.  */
  82     unsigned int phony:1;       /* Nonzero if this is a phony file
  83                                    i.e., a dependency of .PHONY.  */
  84     unsigned int intermediate:1;/* Nonzero if this is an intermediate file.  */
  85     /* Nonzero, for an intermediate file,
  86        means remove_intermediates should not delete it.  */
  87     unsigned int secondary:1;
  88     unsigned int dontcare:1;    /* Nonzero if no complaint is to be made if
  89                                    this target cannot be remade.  */
  90     unsigned int ignore_vpath:1;/* Nonzero if we threw out VPATH name.  */
  91     unsigned int pat_searched:1;/* Nonzero if we already searched for
  92                                    pattern-specific variables.  */
  93     unsigned int considered:1;  /* equal to `considered' if file has been
  94                                    considered on current scan of goal chain */
  95   };
  96
  97
  98 extern struct file *default_goal_file, *suffix_file, *default_file;
  99
 100
 101 extern struct file *lookup_file PARAMS ((char *name));
 102 extern struct file *enter_file PARAMS ((char *name));
 103 extern void remove_intermediates PARAMS ((int sig));
 104 extern void snap_deps PARAMS ((void));
 105 extern void rename_file PARAMS ((struct file *file, char *name));
 106 extern void rehash_file PARAMS ((struct file *file, char *name));
 107 extern void file_hash_enter PARAMS ((struct file *file, char *name,
 108                                      unsigned int oldhash, char *oldname));
 109 extern void set_command_state PARAMS ((struct file *file, int state));
 110 extern void notice_finished_file PARAMS ((struct file *file));
 111
 112
 113 #ifdef ST_MTIM_NSEC
 114 # define FILE_TIMESTAMP_HI_RES \
 115     (2147483647 < INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP) >> 31)
 116 # define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \
 117     file_timestamp_cons (fname, (st).st_mtime, (st).st_mtim.ST_MTIM_NSEC)
 118 #else
 119 # define FILE_TIMESTAMP_HI_RES 0
 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) (((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 ((void));
 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.  */