mirror of
https://github.com/mirror/make.git
synced 2024-12-31 07:20:14 +08:00
4b81f5ca92
Makes the code a little clearer/cleaner, and solves a problem on systems where a char is unsigned by default.
210 lines
9.7 KiB
C
210 lines
9.7 KiB
C
/* Definition of target file data structures for GNU Make.
|
|
Copyright (C) 1988-2013 Free Software Foundation, Inc.
|
|
This file is part of GNU Make.
|
|
|
|
GNU Make is free software; you can redistribute it and/or modify it under the
|
|
terms of the GNU General Public License as published by the Free Software
|
|
Foundation; either version 3 of the License, or (at your option) any later
|
|
version.
|
|
|
|
GNU Make is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
|
|
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License along with
|
|
this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
/* Structure that represents the info on one file
|
|
that the makefile says how to make.
|
|
All of these are chained together through 'next'. */
|
|
|
|
#include "hash.h"
|
|
|
|
struct file
|
|
{
|
|
const char *name;
|
|
const char *hname; /* Hashed filename */
|
|
const char *vpath; /* VPATH/vpath pathname */
|
|
struct dep *deps; /* all dependencies, including duplicates */
|
|
struct commands *cmds; /* Commands to execute for this target. */
|
|
const char *stem; /* Implicit stem, if an implicit
|
|
rule has been used */
|
|
struct dep *also_make; /* Targets that are made by making this. */
|
|
struct file *prev; /* Previous entry for same file name;
|
|
used when there are multiple double-colon
|
|
entries for the same file. */
|
|
struct file *last; /* Last entry for the same file name. */
|
|
|
|
/* File that this file was renamed to. After any time that a
|
|
file could be renamed, call 'check_renamed' (below). */
|
|
struct file *renamed;
|
|
|
|
/* List of variable sets used for this file. */
|
|
struct variable_set_list *variables;
|
|
|
|
/* Pattern-specific variable reference for this target, or null if there
|
|
isn't one. Also see the pat_searched flag, below. */
|
|
struct variable_set_list *pat_variables;
|
|
|
|
/* Immediate dependent that caused this target to be remade,
|
|
or nil if there isn't one. */
|
|
struct file *parent;
|
|
|
|
/* For a double-colon entry, this is the first double-colon entry for
|
|
the same file. Otherwise this is null. */
|
|
struct file *double_colon;
|
|
|
|
FILE_TIMESTAMP last_mtime; /* File's modtime, if already known. */
|
|
FILE_TIMESTAMP mtime_before_update; /* File's modtime before any updating
|
|
has been performed. */
|
|
int command_flags; /* Flags OR'd in for cmds; see commands.h. */
|
|
enum update_status /* Status of the last attempt to update. */
|
|
{
|
|
us_success = 0, /* Successfully updated. Must be 0! */
|
|
us_none, /* No attempt to update has been made. */
|
|
us_question, /* Needs to be updated (-q is is set). */
|
|
us_failed /* Update failed. */
|
|
} update_status ENUM_BITFIELD (2);
|
|
enum cmd_state /* State of the commands. */
|
|
{
|
|
cs_not_started = 0, /* Not yet started. Must be 0! */
|
|
cs_deps_running, /* Dep commands running. */
|
|
cs_running, /* Commands running. */
|
|
cs_finished /* Commands finished. */
|
|
} command_state ENUM_BITFIELD (2);
|
|
|
|
unsigned int builtin:1; /* True if the file is a builtin rule. */
|
|
unsigned int precious:1; /* Non-0 means don't delete file on quit */
|
|
unsigned int loaded:1; /* True if the file is a loaded object. */
|
|
unsigned int low_resolution_time:1; /* Nonzero if this file's time stamp
|
|
has only one-second resolution. */
|
|
unsigned int tried_implicit:1; /* Nonzero if have searched
|
|
for implicit rule for making
|
|
this file; don't search again. */
|
|
unsigned int updating:1; /* Nonzero while updating deps of this file */
|
|
unsigned int updated:1; /* Nonzero if this file has been remade. */
|
|
unsigned int is_target:1; /* Nonzero if file is described as target. */
|
|
unsigned int cmd_target:1; /* Nonzero if file was given on cmd line. */
|
|
unsigned int phony:1; /* Nonzero if this is a phony file
|
|
i.e., a prerequisite of .PHONY. */
|
|
unsigned int intermediate:1;/* Nonzero if this is an intermediate file. */
|
|
unsigned int secondary:1; /* Nonzero means remove_intermediates should
|
|
not delete it. */
|
|
unsigned int dontcare:1; /* Nonzero if no complaint is to be made if
|
|
this target cannot be remade. */
|
|
unsigned int ignore_vpath:1;/* Nonzero if we threw out VPATH name. */
|
|
unsigned int pat_searched:1;/* Nonzero if we already searched for
|
|
pattern-specific variables. */
|
|
unsigned int considered:1; /* equal to 'considered' if file has been
|
|
considered on current scan of goal chain */
|
|
unsigned int no_diag:1; /* True if the file failed to update and no
|
|
diagnostics has been issued (dontcare). */
|
|
};
|
|
|
|
|
|
extern struct file *suffix_file, *default_file;
|
|
|
|
|
|
struct file *lookup_file (const char *name);
|
|
struct file *enter_file (const char *name);
|
|
struct dep *split_prereqs (char *prereqstr);
|
|
struct dep *enter_prereqs (struct dep *prereqs, const char *stem);
|
|
void remove_intermediates (int sig);
|
|
void snap_deps (void);
|
|
void rename_file (struct file *file, const char *name);
|
|
void rehash_file (struct file *file, const char *name);
|
|
void set_command_state (struct file *file, enum cmd_state state);
|
|
void notice_finished_file (struct file *file);
|
|
void init_hash_files (void);
|
|
char *build_target_list (char *old_list);
|
|
void print_prereqs (const struct dep *deps);
|
|
void print_file_data_base (void);
|
|
|
|
#if FILE_TIMESTAMP_HI_RES
|
|
# define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \
|
|
file_timestamp_cons (fname, (st).st_mtime, (st).ST_MTIM_NSEC)
|
|
#else
|
|
# define FILE_TIMESTAMP_STAT_MODTIME(fname, st) \
|
|
file_timestamp_cons (fname, (st).st_mtime, 0)
|
|
#endif
|
|
|
|
/* If FILE_TIMESTAMP is 64 bits (or more), use nanosecond resolution.
|
|
(Multiply by 2**30 instead of by 10**9 to save time at the cost of
|
|
slightly decreasing the number of available timestamps.) With
|
|
64-bit FILE_TIMESTAMP, this stops working on 2514-05-30 01:53:04
|
|
UTC, but by then uintmax_t should be larger than 64 bits. */
|
|
#define FILE_TIMESTAMPS_PER_S (FILE_TIMESTAMP_HI_RES ? 1000000000 : 1)
|
|
#define FILE_TIMESTAMP_LO_BITS (FILE_TIMESTAMP_HI_RES ? 30 : 0)
|
|
|
|
#define FILE_TIMESTAMP_S(ts) (((ts) - ORDINARY_MTIME_MIN) \
|
|
>> FILE_TIMESTAMP_LO_BITS)
|
|
#define FILE_TIMESTAMP_NS(ts) ((int) (((ts) - ORDINARY_MTIME_MIN) \
|
|
& ((1 << FILE_TIMESTAMP_LO_BITS) - 1)))
|
|
|
|
/* Upper bound on length of string "YYYY-MM-DD HH:MM:SS.NNNNNNNNN"
|
|
representing a file timestamp. The upper bound is not necessarily 19,
|
|
since the year might be less than -999 or greater than 9999.
|
|
|
|
Subtract one for the sign bit if in case file timestamps can be negative;
|
|
subtract FLOOR_LOG2_SECONDS_PER_YEAR to yield an upper bound on how many
|
|
file timestamp bits might affect the year;
|
|
302 / 1000 is log10 (2) rounded up;
|
|
add one for integer division truncation;
|
|
add one more for a minus sign if file timestamps can be negative;
|
|
add 4 to allow for any 4-digit epoch year (e.g. 1970);
|
|
add 25 to allow for "-MM-DD HH:MM:SS.NNNNNNNNN". */
|
|
#define FLOOR_LOG2_SECONDS_PER_YEAR 24
|
|
#define FILE_TIMESTAMP_PRINT_LEN_BOUND \
|
|
(((sizeof (FILE_TIMESTAMP) * CHAR_BIT - 1 - FLOOR_LOG2_SECONDS_PER_YEAR) \
|
|
* 302 / 1000) \
|
|
+ 1 + 1 + 4 + 25)
|
|
|
|
FILE_TIMESTAMP file_timestamp_cons (char const *, time_t, long int);
|
|
FILE_TIMESTAMP file_timestamp_now (int *);
|
|
void file_timestamp_sprintf (char *p, FILE_TIMESTAMP ts);
|
|
|
|
/* Return the mtime of file F (a struct file *), caching it.
|
|
The value is NONEXISTENT_MTIME if the file does not exist. */
|
|
#define file_mtime(f) file_mtime_1 ((f), 1)
|
|
/* Return the mtime of file F (a struct file *), caching it.
|
|
Don't search using vpath for the file--if it doesn't actually exist,
|
|
we don't find it.
|
|
The value is NONEXISTENT_MTIME if the file does not exist. */
|
|
#define file_mtime_no_search(f) file_mtime_1 ((f), 0)
|
|
FILE_TIMESTAMP f_mtime (struct file *file, int search);
|
|
#define file_mtime_1(f, v) \
|
|
((f)->last_mtime == UNKNOWN_MTIME ? f_mtime ((f), v) : (f)->last_mtime)
|
|
|
|
/* Special timestamp values. */
|
|
|
|
/* The file's timestamp is not yet known. */
|
|
#define UNKNOWN_MTIME 0
|
|
|
|
/* The file does not exist. */
|
|
#define NONEXISTENT_MTIME 1
|
|
|
|
/* The file does not exist, and we assume that it is older than any
|
|
actual file. */
|
|
#define OLD_MTIME 2
|
|
|
|
/* The smallest and largest ordinary timestamps. */
|
|
#define ORDINARY_MTIME_MIN (OLD_MTIME + 1)
|
|
#define ORDINARY_MTIME_MAX ((FILE_TIMESTAMP_S (NEW_MTIME) \
|
|
<< FILE_TIMESTAMP_LO_BITS) \
|
|
+ ORDINARY_MTIME_MIN + FILE_TIMESTAMPS_PER_S - 1)
|
|
|
|
/* Modtime value to use for 'infinitely new'. We used to get the current time
|
|
from the system and use that whenever we wanted 'new'. But that causes
|
|
trouble when the machine running make and the machine holding a file have
|
|
different ideas about what time it is; and can also lose for 'force'
|
|
targets, which need to be considered newer than anything that depends on
|
|
them, even if said dependents' modtimes are in the future. */
|
|
#define NEW_MTIME INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP)
|
|
|
|
#define check_renamed(file) \
|
|
while ((file)->renamed != 0) (file) = (file)->renamed /* No ; here. */
|
|
|
|
/* Have we snapped deps yet? */
|
|
extern int snapped_deps;
|