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make/filedef.h
Paul Smith 9d89ad56bf * Fix up and document $(apply ...) function.
1999-07-15 07:36:44 +00:00

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/* Definition of target file data structures for GNU Make.
Copyright (C) 1988,89,90,91,92,93,94,97 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 2, 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 GNU Make; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* Structure that represents the info on one file
that the makefile says how to make.
All of these are chained together through `next'. */
struct file
{
struct file *next;
char *name;
char *hname; /* Hashed filename */
char *vpath; /* VPATH/vpath pathname */
struct dep *deps;
struct commands *cmds; /* Commands to execute for this target. */
int command_flags; /* Flags OR'd in for cmds; see commands.h. */
char *stem; /* Implicit stem, if an implicit
rule has been used */
struct dep *also_make; /* Targets that are made by making this. */
FILE_TIMESTAMP last_mtime; /* File's modtime, if already known. */
FILE_TIMESTAMP mtime_before_update; /* File's modtime before any updating
has been performed. */
struct file *prev; /* Previous entry for same file name;
used when there are multiple double-colon
entries for the same file. */
/* 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;
/* 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;
/* Pattern-specific variable reference for this target, or null if there
isn't one. Also see the pat_searched flag, below. */
struct pattern_var *patvar;
short int update_status; /* Status of the last attempt to update,
or -1 if none has been made. */
enum /* State of the commands. */
{ /* Note: It is important that cs_not_started be zero. */
cs_not_started, /* Not yet started. */
cs_deps_running, /* Dep commands running. */
cs_running, /* Commands running. */
cs_finished /* Commands finished. */
} command_state ENUM_BITFIELD (2);
unsigned int precious:1; /* Non-0 means don't delete file on quit */
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 dependency of .PHONY. */
unsigned int intermediate:1;/* Nonzero if this is an intermediate file. */
/* Nonzero, for an intermediate file,
means remove_intermediates should not delete it. */
unsigned int secondary:1;
unsigned int dontcare:1; /* Nonzero if no complaint is to be made if
this target cannot be remade. */
unsigned int mfile_status:1;/* Nonzero if update_status was obtained
while remaking a makefile. */
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. */
};
/* Number of intermediate files entered. */
extern unsigned int num_intermediates;
extern struct file *default_goal_file, *suffix_file, *default_file;
extern struct file *lookup_file PARAMS ((char *name));
extern struct file *enter_file PARAMS ((char *name));
extern void remove_intermediates PARAMS ((int sig));
extern void snap_deps PARAMS ((void));
extern void rename_file PARAMS ((struct file *file, char *name));
extern void rehash_file PARAMS ((struct file *file, char *name));
extern void file_hash_enter PARAMS ((struct file *file, char *name,
unsigned int oldhash, char *oldname));
extern void set_command_state PARAMS ((struct file *file, int state));
extern void notice_finished_file PARAMS ((struct file *file));
#if ST_MTIM_NSEC
# define FILE_TIMESTAMP_STAT_MODTIME(st) \
FILE_TIMESTAMP_FROM_S_AND_NS ((st).st_mtim.tv_sec, \
(st).st_mtim.ST_MTIM_NSEC)
# define FILE_TIMESTAMPS_PER_S \
MIN ((FILE_TIMESTAMP) 1000000000, \
(INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP) \
/ INTEGER_TYPE_MAXIMUM (time_t)))
#else
# define FILE_TIMESTAMP_STAT_MODTIME(st) ((st).st_mtime)
# define FILE_TIMESTAMPS_PER_S 1
#endif
#define FILE_TIMESTAMP_FROM_S_AND_NS(s, ns) \
((s) * FILE_TIMESTAMPS_PER_S \
+ (ns) * FILE_TIMESTAMPS_PER_S / 1000000000)
#define FILE_TIMESTAMP_DIV(a, b) ((a)/(b) - ((a)%(b) < 0))
#define FILE_TIMESTAMP_MOD(a, b) ((a)%(b) + ((a)%(b) < 0) * (b))
#define FILE_TIMESTAMP_S(ts) FILE_TIMESTAMP_DIV ((ts), FILE_TIMESTAMPS_PER_S)
#define FILE_TIMESTAMP_NS(ts) \
(((FILE_TIMESTAMP_MOD ((ts), FILE_TIMESTAMPS_PER_S) * 1000000000) \
+ (FILE_TIMESTAMPS_PER_S - 1)) \
/ FILE_TIMESTAMPS_PER_S)
/* 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)
extern FILE_TIMESTAMP file_timestamp_now PARAMS ((void));
extern void file_timestamp_sprintf PARAMS ((char *p, FILE_TIMESTAMP ts));
/* Return the mtime of file F (a struct file *), caching it.
The value is -1 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 -1 if the file does not exist. */
#define file_mtime_no_search(f) file_mtime_1 ((f), 0)
extern FILE_TIMESTAMP f_mtime PARAMS ((struct file *file, int search));
#define file_mtime_1(f, v) \
((f)->last_mtime ? (f)->last_mtime : f_mtime ((f), v))
/* 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.
If FILE_TIMESTAMP is unsigned, its maximum value is the same as
((FILE_TIMESTAMP) -1), so use one less than that, because -1 is
used for non-existing files. */
#define NEW_MTIME \
(INTEGER_TYPE_SIGNED (FILE_TIMESTAMP) \
? INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP) \
: (INTEGER_TYPE_MAXIMUM (FILE_TIMESTAMP) - 1))
#define check_renamed(file) \
while ((file)->renamed != 0) (file) = (file)->renamed /* No ; here. */
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