| 1 | /* Definition of target file data structures for GNU Make.
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| 2 | Copyright (C) 1988-2016 Free Software Foundation, Inc.
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| 3 | This file is part of GNU Make.
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| 4 |
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| 5 | GNU Make is free software; you can redistribute it and/or modify it under the
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| 6 | terms of the GNU General Public License as published by the Free Software
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| 7 | Foundation; either version 3 of the License, or (at your option) any later
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| 8 | version.
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| 9 |
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| 10 | GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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| 11 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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| 12 | A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU General Public License along with
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| 15 | this program. If not, see <http://www.gnu.org/licenses/>. */
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| 16 |
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| 17 |
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| 18 | /* Structure that represents the info on one file
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| 19 | that the makefile says how to make.
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| 20 | All of these are chained together through 'next'. */
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| 21 |
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| 22 | #include "hash.h"
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| 23 |
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| 24 | struct file
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| 25 | {
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| 26 | const char *name;
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| 27 | const char *hname; /* Hashed filename */
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| 28 | const char *vpath; /* VPATH/vpath pathname */
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| 29 | struct dep *deps; /* all dependencies, including duplicates */
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| 30 | struct commands *cmds; /* Commands to execute for this target. */
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| 31 | const char *stem; /* Implicit stem, if an implicit
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| 32 | rule has been used */
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| 33 | struct dep *also_make; /* Targets that are made by making this. */
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| 34 | struct file *prev; /* Previous entry for same file name;
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| 35 | used when there are multiple double-colon
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| 36 | entries for the same file. */
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| 37 | struct file *last; /* Last entry for the same file name. */
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| 38 |
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| 39 | /* File that this file was renamed to. After any time that a
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| 40 | file could be renamed, call 'check_renamed' (below). */
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| 41 | struct file *renamed;
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| 42 |
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| 43 | /* List of variable sets used for this file. */
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| 44 | struct variable_set_list *variables;
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| 45 |
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| 46 | /* Pattern-specific variable reference for this target, or null if there
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| 47 | isn't one. Also see the pat_searched flag, below. */
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| 48 | struct variable_set_list *pat_variables;
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| 49 |
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| 50 | /* Immediate dependent that caused this target to be remade,
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| 51 | or nil if there isn't one. */
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| 52 | struct file *parent;
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| 53 |
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| 54 | /* For a double-colon entry, this is the first double-colon entry for
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| 55 | the same file. Otherwise this is null. */
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| 56 | struct file *double_colon;
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| 57 |
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| 58 | FILE_TIMESTAMP last_mtime; /* File's modtime, if already known. */
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| 59 | FILE_TIMESTAMP mtime_before_update; /* File's modtime before any updating
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| 60 | has been performed. */
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| 61 | unsigned int considered; /* equal to 'considered' if file has been
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| 62 | considered on current scan of goal chain */
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| 63 | int command_flags; /* Flags OR'd in for cmds; see commands.h. */
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| 64 | enum update_status /* Status of the last attempt to update. */
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| 65 | {
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| 66 | us_success = 0, /* Successfully updated. Must be 0! */
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| 67 | us_none, /* No attempt to update has been made. */
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| 68 | us_question, /* Needs to be updated (-q is is set). */
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| 69 | us_failed /* Update failed. */
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| 70 | } update_status ENUM_BITFIELD (2);
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| 71 | enum cmd_state /* State of the commands. */
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| 72 | {
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| 73 | cs_not_started = 0, /* Not yet started. Must be 0! */
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| 74 | cs_deps_running, /* Dep commands running. */
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| 75 | cs_running, /* Commands running. */
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| 76 | cs_finished /* Commands finished. */
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| 77 | } command_state ENUM_BITFIELD (2);
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| 78 |
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| 79 | unsigned int builtin:1; /* True if the file is a builtin rule. */
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| 80 | unsigned int precious:1; /* Non-0 means don't delete file on quit */
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| 81 | unsigned int loaded:1; /* True if the file is a loaded object. */
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| 82 | unsigned int low_resolution_time:1; /* Nonzero if this file's time stamp
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| 83 | has only one-second resolution. */
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| 84 | unsigned int tried_implicit:1; /* Nonzero if have searched
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| 85 | for implicit rule for making
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| 86 | this file; don't search again. */
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| 87 | unsigned int updating:1; /* Nonzero while updating deps of this file */
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| 88 | unsigned int updated:1; /* Nonzero if this file has been remade. */
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| 89 | unsigned int is_target:1; /* Nonzero if file is described as target. */
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| 90 | unsigned int cmd_target:1; /* Nonzero if file was given on cmd line. */
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| 91 | unsigned int phony:1; /* Nonzero if this is a phony file
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| 92 | i.e., a prerequisite of .PHONY. */
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| 93 | unsigned int intermediate:1;/* Nonzero if this is an intermediate file. */
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| 94 | unsigned int secondary:1; /* Nonzero means remove_intermediates should
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| 95 | not delete it. */
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| 96 | unsigned int dontcare:1; /* Nonzero if no complaint is to be made if
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| 97 | this target cannot be remade. */
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| 98 | unsigned int ignore_vpath:1;/* Nonzero if we threw out VPATH name. */
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| 99 | unsigned int pat_searched:1;/* Nonzero if we already searched for
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| 100 | pattern-specific variables. */
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| 101 | unsigned int no_diag:1; /* True if the file failed to update and no
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| 102 | diagnostics has been issued (dontcare). */
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| 103 | };
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| 104 |
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| 105 |
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| 106 | extern struct file *default_file;
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| 107 |
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| 108 |
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| 109 | struct file *lookup_file (const char *name);
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| 110 | struct file *enter_file (const char *name);
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| 111 | struct dep *split_prereqs (char *prereqstr);
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| 112 | struct dep *enter_prereqs (struct dep *prereqs, const char *stem);
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| 113 | void remove_intermediates (int sig);
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| 114 | void snap_deps (void);
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| 115 | void rename_file (struct file *file, const char *name);
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| 116 | void rehash_file (struct file *file, const char *name);
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| 117 | void set_command_state (struct file *file, enum cmd_state state);
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| 118 | void notice_finished_file (struct file *file);
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| 119 | void init_hash_files (void);
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| 120 | void verify_file_data_base (void);
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| 121 | char *build_target_list (char *old_list);
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| 122 | void print_prereqs (const struct dep *deps);
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| 123 | void print_file_data_base (void);
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| 124 | int try_implicit_rule (struct file *file, unsigned int depth);
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| 125 | int stemlen_compare (const void *v1, const void *v2);
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| 126 |
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| 127 | #if FILE_TIMESTAMP_HI_RES
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| 128 | # define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \
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| 129 | file_timestamp_cons (fname, (st).st_mtime, (st).ST_MTIM_NSEC)
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| 130 | #else
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| 131 | # define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \
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| 132 | file_timestamp_cons (fname, (st).st_mtime, 0)
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| 133 | #endif
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| 134 |
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| 135 | /* If FILE_TIMESTAMP is 64 bits (or more), use nanosecond resolution.
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| 136 | (Multiply by 2**30 instead of by 10**9 to save time at the cost of
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| 137 | slightly decreasing the number of available timestamps.) With
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| 138 | 64-bit FILE_TIMESTAMP, this stops working on 2514-05-30 01:53:04
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| 139 | UTC, but by then uintmax_t should be larger than 64 bits. */
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| 140 | #define FILE_TIMESTAMPS_PER_S (FILE_TIMESTAMP_HI_RES ? 1000000000 : 1)
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| 141 | #define FILE_TIMESTAMP_LO_BITS (FILE_TIMESTAMP_HI_RES ? 30 : 0)
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| 142 |
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| 143 | #define FILE_TIMESTAMP_S(ts) (((ts) - ORDINARY_MTIME_MIN) \
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| 144 | >> FILE_TIMESTAMP_LO_BITS)
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| 145 | #define FILE_TIMESTAMP_NS(ts) ((int) (((ts) - ORDINARY_MTIME_MIN) \
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| 146 | & ((1 << FILE_TIMESTAMP_LO_BITS) - 1)))
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| 147 |
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| 148 | /* Upper bound on length of string "YYYY-MM-DD HH:MM:SS.NNNNNNNNN"
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| 149 | representing a file timestamp. The upper bound is not necessarily 29,
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| 150 | since the year might be less than -999 or greater than 9999.
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| 151 |
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| 152 | Subtract one for the sign bit if in case file timestamps can be negative;
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| 153 | subtract FLOOR_LOG2_SECONDS_PER_YEAR to yield an upper bound on how many
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| 154 | file timestamp bits might affect the year;
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| 155 | 302 / 1000 is log10 (2) rounded up;
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| 156 | add one for integer division truncation;
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| 157 | add one more for a minus sign if file timestamps can be negative;
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| 158 | add 4 to allow for any 4-digit epoch year (e.g. 1970);
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| 159 | add 25 to allow for "-MM-DD HH:MM:SS.NNNNNNNNN". */
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| 160 | #define FLOOR_LOG2_SECONDS_PER_YEAR 24
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| 161 | #define FILE_TIMESTAMP_PRINT_LEN_BOUND \
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| 162 | (((sizeof (FILE_TIMESTAMP) * CHAR_BIT - 1 - FLOOR_LOG2_SECONDS_PER_YEAR) \
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| 163 | * 302 / 1000) \
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| 164 | + 1 + 1 + 4 + 25)
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| 165 |
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| 166 | FILE_TIMESTAMP file_timestamp_cons (char const *, time_t, long int);
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| 167 | FILE_TIMESTAMP file_timestamp_now (int *);
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| 168 | void file_timestamp_sprintf (char *p, FILE_TIMESTAMP ts);
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| 169 |
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| 170 | /* Return the mtime of file F (a struct file *), caching it.
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| 171 | The value is NONEXISTENT_MTIME if the file does not exist. */
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| 172 | #define file_mtime(f) file_mtime_1 ((f), 1)
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| 173 | /* Return the mtime of file F (a struct file *), caching it.
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| 174 | Don't search using vpath for the file--if it doesn't actually exist,
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| 175 | we don't find it.
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| 176 | The value is NONEXISTENT_MTIME if the file does not exist. */
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| 177 | #define file_mtime_no_search(f) file_mtime_1 ((f), 0)
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| 178 | FILE_TIMESTAMP f_mtime (struct file *file, int search);
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| 179 | #define file_mtime_1(f, v) \
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| 180 | ((f)->last_mtime == UNKNOWN_MTIME ? f_mtime ((f), v) : (f)->last_mtime)
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| 181 |
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| 182 | /* Special timestamp values. */
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| 183 |
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| 184 | /* The file's timestamp is not yet known. */
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| 185 | #define UNKNOWN_MTIME 0
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| 186 |
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| 187 | /* The file does not exist. */
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| 188 | #define NONEXISTENT_MTIME 1
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| 189 |
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| 190 | /* The file does not exist, and we assume that it is older than any
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| 191 | actual file. */
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| 192 | #define OLD_MTIME 2
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| 193 |
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| 194 | /* The smallest and largest ordinary timestamps. */
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| 195 | #define ORDINARY_MTIME_MIN (OLD_MTIME + 1)
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| 196 | #define ORDINARY_MTIME_MAX ((FILE_TIMESTAMP_S (NEW_MTIME) \
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| 197 | << FILE_TIMESTAMP_LO_BITS) \
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| 198 | + ORDINARY_MTIME_MIN + FILE_TIMESTAMPS_PER_S - 1)
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| 199 |
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| 200 | /* Modtime value to use for 'infinitely new'. We used to get the current time
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| 201 | from the system and use that whenever we wanted 'new'. But that causes
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| 202 | trouble when the machine running make and the machine holding a file have
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| 203 | different ideas about what time it is; and can also lose for 'force'
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| 204 | targets, which need to be considered newer than anything that depends on
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| 205 | them, even if said dependents' modtimes are in the future. */
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| 206 | #define NEW_MTIME INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP)
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| 207 |
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| 208 | #define check_renamed(file) \
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| 209 | while ((file)->renamed != 0) (file) = (file)->renamed /* No ; here. */
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| 210 |
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| 211 | /* Have we snapped deps yet? */
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| 212 | extern int snapped_deps;
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