mirror of
https://github.com/git/git.git
synced 2024-11-14 21:23:03 +01:00
644797119d
The core rename detection had some rather stupid code to check if a pathname was used by a later modification or rename, which basically walked the whole pathname space for all renames for each rename, in order to tell whether it was a pure rename (no remaining users) or should be considered a copy (other users of the source file remaining). That's really silly, since we can just keep a count of users around, and replace all those complex and expensive loops with just testing that simple counter (but this all depends on the previous commit that shared the diff_filespec data structure by using a separate reference count). Note that the reference count is not the same as the rename count: they behave otherwise rather similarly, but the reference count is tied to the allocation (and decremented at de-allocation, so that when it turns zero we can get rid of the memory), while the rename count is tied to the renames and is decremented when we find a rename (so that when it turns zero we know that it was a rename, not a copy). Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
121 lines
4 KiB
C
121 lines
4 KiB
C
/*
|
|
* Copyright (C) 2005 Junio C Hamano
|
|
*/
|
|
#ifndef DIFFCORE_H
|
|
#define DIFFCORE_H
|
|
|
|
/* This header file is internal between diff.c and its diff transformers
|
|
* (e.g. diffcore-rename, diffcore-pickaxe). Never include this header
|
|
* in anything else.
|
|
*/
|
|
|
|
/* We internally use unsigned short as the score value,
|
|
* and rely on an int capable to hold 32-bits. -B can take
|
|
* -Bmerge_score/break_score format and the two scores are
|
|
* passed around in one int (high 16-bit for merge and low 16-bit
|
|
* for break).
|
|
*/
|
|
#define MAX_SCORE 60000.0
|
|
#define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */
|
|
#define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%) */
|
|
#define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen 60%) */
|
|
|
|
#define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */
|
|
|
|
struct diff_filespec {
|
|
unsigned char sha1[20];
|
|
char *path;
|
|
void *data;
|
|
void *cnt_data;
|
|
const char *funcname_pattern_ident;
|
|
unsigned long size;
|
|
int count; /* Reference count */
|
|
int xfrm_flags; /* for use by the xfrm */
|
|
int rename_used; /* Count of rename users */
|
|
unsigned short mode; /* file mode */
|
|
unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
|
|
* if false, use the name and read from
|
|
* the filesystem.
|
|
*/
|
|
#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
|
|
unsigned should_free : 1; /* data should be free()'ed */
|
|
unsigned should_munmap : 1; /* data should be munmap()'ed */
|
|
unsigned checked_attr : 1;
|
|
unsigned is_binary : 1; /* data should be considered "binary" */
|
|
};
|
|
|
|
extern struct diff_filespec *alloc_filespec(const char *);
|
|
extern void free_filespec(struct diff_filespec *);
|
|
extern void fill_filespec(struct diff_filespec *, const unsigned char *,
|
|
unsigned short);
|
|
|
|
extern int diff_populate_filespec(struct diff_filespec *, int);
|
|
extern void diff_free_filespec_data(struct diff_filespec *);
|
|
extern void diff_free_filespec_blob(struct diff_filespec *);
|
|
extern int diff_filespec_is_binary(struct diff_filespec *);
|
|
|
|
struct diff_filepair {
|
|
struct diff_filespec *one;
|
|
struct diff_filespec *two;
|
|
unsigned short int score;
|
|
char status; /* M C R N D U (see Documentation/diff-format.txt) */
|
|
unsigned broken_pair : 1;
|
|
unsigned renamed_pair : 1;
|
|
unsigned is_unmerged : 1;
|
|
};
|
|
#define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
|
|
|
|
#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
|
|
|
|
#define DIFF_PAIR_BROKEN(p) \
|
|
( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
|
|
((p)->broken_pair != 0) )
|
|
|
|
#define DIFF_PAIR_TYPE_CHANGED(p) \
|
|
((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
|
|
|
|
#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
|
|
|
|
extern void diff_free_filepair(struct diff_filepair *);
|
|
|
|
extern int diff_unmodified_pair(struct diff_filepair *);
|
|
|
|
struct diff_queue_struct {
|
|
struct diff_filepair **queue;
|
|
int alloc;
|
|
int nr;
|
|
};
|
|
|
|
extern struct diff_queue_struct diff_queued_diff;
|
|
extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
|
|
struct diff_filespec *,
|
|
struct diff_filespec *);
|
|
extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
|
|
|
|
extern void diffcore_pathspec(const char **pathspec);
|
|
extern void diffcore_break(int);
|
|
extern void diffcore_rename(struct diff_options *);
|
|
extern void diffcore_merge_broken(void);
|
|
extern void diffcore_pickaxe(const char *needle, int opts);
|
|
extern void diffcore_order(const char *orderfile);
|
|
|
|
#define DIFF_DEBUG 0
|
|
#if DIFF_DEBUG
|
|
void diff_debug_filespec(struct diff_filespec *, int, const char *);
|
|
void diff_debug_filepair(const struct diff_filepair *, int);
|
|
void diff_debug_queue(const char *, struct diff_queue_struct *);
|
|
#else
|
|
#define diff_debug_filespec(a,b,c) do {} while(0)
|
|
#define diff_debug_filepair(a,b) do {} while(0)
|
|
#define diff_debug_queue(a,b) do {} while(0)
|
|
#endif
|
|
|
|
extern int diffcore_count_changes(struct diff_filespec *src,
|
|
struct diff_filespec *dst,
|
|
void **src_count_p,
|
|
void **dst_count_p,
|
|
unsigned long delta_limit,
|
|
unsigned long *src_copied,
|
|
unsigned long *literal_added);
|
|
|
|
#endif
|