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Diffstat (limited to 'filedef.h')
| -rw-r--r-- | filedef.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/filedef.h b/filedef.h new file mode 100644 index 0000000..b8973db --- /dev/null +++ b/filedef.h @@ -0,0 +1,209 @@ +/* Definition of target file data structures for GNU Make. +Copyright (C) 1988-2014 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 29, + 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; |