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209 lines
9.7 KiB
C
209 lines
9.7 KiB
C
/* Definition of target file data structures for GNU Make.
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Copyright (C) 1988-2014 Free Software Foundation, Inc.
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This file is part of GNU Make.
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GNU Make is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3 of the License, or (at your option) any later
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version.
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GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Structure that represents the info on one file
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that the makefile says how to make.
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All of these are chained together through 'next'. */
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#include "hash.h"
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struct file
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{
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const char *name;
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const char *hname; /* Hashed filename */
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const char *vpath; /* VPATH/vpath pathname */
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struct dep *deps; /* all dependencies, including duplicates */
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struct commands *cmds; /* Commands to execute for this target. */
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const char *stem; /* Implicit stem, if an implicit
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rule has been used */
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struct dep *also_make; /* Targets that are made by making this. */
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struct file *prev; /* Previous entry for same file name;
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used when there are multiple double-colon
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entries for the same file. */
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struct file *last; /* Last entry for the same file name. */
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/* File that this file was renamed to. After any time that a
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file could be renamed, call 'check_renamed' (below). */
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struct file *renamed;
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/* List of variable sets used for this file. */
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struct variable_set_list *variables;
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/* Pattern-specific variable reference for this target, or null if there
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isn't one. Also see the pat_searched flag, below. */
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struct variable_set_list *pat_variables;
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/* Immediate dependent that caused this target to be remade,
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or nil if there isn't one. */
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struct file *parent;
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/* For a double-colon entry, this is the first double-colon entry for
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the same file. Otherwise this is null. */
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struct file *double_colon;
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FILE_TIMESTAMP last_mtime; /* File's modtime, if already known. */
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FILE_TIMESTAMP mtime_before_update; /* File's modtime before any updating
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has been performed. */
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int command_flags; /* Flags OR'd in for cmds; see commands.h. */
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enum update_status /* Status of the last attempt to update. */
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{
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us_success = 0, /* Successfully updated. Must be 0! */
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us_none, /* No attempt to update has been made. */
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us_question, /* Needs to be updated (-q is is set). */
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us_failed /* Update failed. */
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} update_status ENUM_BITFIELD (2);
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enum cmd_state /* State of the commands. */
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{
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cs_not_started = 0, /* Not yet started. Must be 0! */
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cs_deps_running, /* Dep commands running. */
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cs_running, /* Commands running. */
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cs_finished /* Commands finished. */
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} command_state ENUM_BITFIELD (2);
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unsigned int builtin:1; /* True if the file is a builtin rule. */
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unsigned int precious:1; /* Non-0 means don't delete file on quit */
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unsigned int loaded:1; /* True if the file is a loaded object. */
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unsigned int low_resolution_time:1; /* Nonzero if this file's time stamp
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has only one-second resolution. */
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unsigned int tried_implicit:1; /* Nonzero if have searched
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for implicit rule for making
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this file; don't search again. */
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unsigned int updating:1; /* Nonzero while updating deps of this file */
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unsigned int updated:1; /* Nonzero if this file has been remade. */
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unsigned int is_target:1; /* Nonzero if file is described as target. */
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unsigned int cmd_target:1; /* Nonzero if file was given on cmd line. */
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unsigned int phony:1; /* Nonzero if this is a phony file
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i.e., a prerequisite of .PHONY. */
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unsigned int intermediate:1;/* Nonzero if this is an intermediate file. */
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unsigned int secondary:1; /* Nonzero means remove_intermediates should
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not delete it. */
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unsigned int dontcare:1; /* Nonzero if no complaint is to be made if
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this target cannot be remade. */
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unsigned int ignore_vpath:1;/* Nonzero if we threw out VPATH name. */
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unsigned int pat_searched:1;/* Nonzero if we already searched for
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pattern-specific variables. */
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unsigned int considered:1; /* equal to 'considered' if file has been
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considered on current scan of goal chain */
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unsigned int no_diag:1; /* True if the file failed to update and no
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diagnostics has been issued (dontcare). */
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};
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extern struct file *suffix_file, *default_file;
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struct file *lookup_file (const char *name);
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struct file *enter_file (const char *name);
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struct dep *split_prereqs (char *prereqstr);
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struct dep *enter_prereqs (struct dep *prereqs, const char *stem);
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void remove_intermediates (int sig);
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void snap_deps (void);
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void rename_file (struct file *file, const char *name);
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void rehash_file (struct file *file, const char *name);
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void set_command_state (struct file *file, enum cmd_state state);
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void notice_finished_file (struct file *file);
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void init_hash_files (void);
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char *build_target_list (char *old_list);
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void print_prereqs (const struct dep *deps);
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void print_file_data_base (void);
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#if FILE_TIMESTAMP_HI_RES
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# define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \
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file_timestamp_cons (fname, (st).st_mtime, (st).ST_MTIM_NSEC)
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#else
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# define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \
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file_timestamp_cons (fname, (st).st_mtime, 0)
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#endif
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/* If FILE_TIMESTAMP is 64 bits (or more), use nanosecond resolution.
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(Multiply by 2**30 instead of by 10**9 to save time at the cost of
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slightly decreasing the number of available timestamps.) With
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64-bit FILE_TIMESTAMP, this stops working on 2514-05-30 01:53:04
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UTC, but by then uintmax_t should be larger than 64 bits. */
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#define FILE_TIMESTAMPS_PER_S (FILE_TIMESTAMP_HI_RES ? 1000000000 : 1)
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#define FILE_TIMESTAMP_LO_BITS (FILE_TIMESTAMP_HI_RES ? 30 : 0)
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#define FILE_TIMESTAMP_S(ts) (((ts) - ORDINARY_MTIME_MIN) \
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>> FILE_TIMESTAMP_LO_BITS)
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#define FILE_TIMESTAMP_NS(ts) ((int) (((ts) - ORDINARY_MTIME_MIN) \
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& ((1 << FILE_TIMESTAMP_LO_BITS) - 1)))
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/* Upper bound on length of string "YYYY-MM-DD HH:MM:SS.NNNNNNNNN"
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representing a file timestamp. The upper bound is not necessarily 29,
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since the year might be less than -999 or greater than 9999.
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Subtract one for the sign bit if in case file timestamps can be negative;
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subtract FLOOR_LOG2_SECONDS_PER_YEAR to yield an upper bound on how many
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file timestamp bits might affect the year;
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302 / 1000 is log10 (2) rounded up;
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add one for integer division truncation;
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add one more for a minus sign if file timestamps can be negative;
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add 4 to allow for any 4-digit epoch year (e.g. 1970);
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add 25 to allow for "-MM-DD HH:MM:SS.NNNNNNNNN". */
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#define FLOOR_LOG2_SECONDS_PER_YEAR 24
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#define FILE_TIMESTAMP_PRINT_LEN_BOUND \
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(((sizeof (FILE_TIMESTAMP) * CHAR_BIT - 1 - FLOOR_LOG2_SECONDS_PER_YEAR) \
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* 302 / 1000) \
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+ 1 + 1 + 4 + 25)
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FILE_TIMESTAMP file_timestamp_cons (char const *, time_t, long int);
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FILE_TIMESTAMP file_timestamp_now (int *);
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void file_timestamp_sprintf (char *p, FILE_TIMESTAMP ts);
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/* Return the mtime of file F (a struct file *), caching it.
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The value is NONEXISTENT_MTIME if the file does not exist. */
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#define file_mtime(f) file_mtime_1 ((f), 1)
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/* Return the mtime of file F (a struct file *), caching it.
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Don't search using vpath for the file--if it doesn't actually exist,
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we don't find it.
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The value is NONEXISTENT_MTIME if the file does not exist. */
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#define file_mtime_no_search(f) file_mtime_1 ((f), 0)
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FILE_TIMESTAMP f_mtime (struct file *file, int search);
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#define file_mtime_1(f, v) \
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((f)->last_mtime == UNKNOWN_MTIME ? f_mtime ((f), v) : (f)->last_mtime)
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/* Special timestamp values. */
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/* The file's timestamp is not yet known. */
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#define UNKNOWN_MTIME 0
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/* The file does not exist. */
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#define NONEXISTENT_MTIME 1
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/* The file does not exist, and we assume that it is older than any
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actual file. */
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#define OLD_MTIME 2
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/* The smallest and largest ordinary timestamps. */
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#define ORDINARY_MTIME_MIN (OLD_MTIME + 1)
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#define ORDINARY_MTIME_MAX ((FILE_TIMESTAMP_S (NEW_MTIME) \
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<< FILE_TIMESTAMP_LO_BITS) \
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+ ORDINARY_MTIME_MIN + FILE_TIMESTAMPS_PER_S - 1)
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/* Modtime value to use for 'infinitely new'. We used to get the current time
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from the system and use that whenever we wanted 'new'. But that causes
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trouble when the machine running make and the machine holding a file have
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different ideas about what time it is; and can also lose for 'force'
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targets, which need to be considered newer than anything that depends on
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them, even if said dependents' modtimes are in the future. */
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#define NEW_MTIME INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP)
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#define check_renamed(file) \
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while ((file)->renamed != 0) (file) = (file)->renamed /* No ; here. */
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/* Have we snapped deps yet? */
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extern int snapped_deps;
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