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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
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#ifndef DIFFCORE_H
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#define DIFFCORE_H
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/* This header file is internal between diff.c and its diff transformers
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* (e.g. diffcore-rename, diffcore-pickaxe). Never include this header
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* in anything else.
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*/
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/* We internally use unsigned short as the score value,
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* and rely on an int capable to hold 32-bits. -B can take
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* -Bmerge_score/break_score format and the two scores are
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* passed around in one int (high 16-bit for merge and low 16-bit
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* for break).
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*/
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#define MAX_SCORE 60000.0
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#define DEFAULT_RENAME_SCORE 30000 /* rename/copy similarity minimum (50%) */
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#define DEFAULT_BREAK_SCORE 30000 /* minimum for break to happen (50%) */
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#define DEFAULT_MERGE_SCORE 36000 /* maximum for break-merge to happen 60%) */
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#define MINIMUM_BREAK_SIZE 400 /* do not break a file smaller than this */
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struct diff_filespec {
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unsigned char sha1[20];
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char *path;
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void *data;
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void *cnt_data;
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const char *funcname_pattern_ident;
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unsigned long size;
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int count; /* Reference count */
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int xfrm_flags; /* for use by the xfrm */
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int rename_used; /* Count of rename users */
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unsigned short mode; /* file mode */
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unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
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* if false, use the name and read from
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* the filesystem.
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*/
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#define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
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unsigned should_free : 1; /* data should be free()'ed */
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unsigned should_munmap : 1; /* data should be munmap()'ed */
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unsigned checked_attr : 1;
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unsigned is_binary : 1; /* data should be considered "binary" */
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};
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extern struct diff_filespec *alloc_filespec(const char *);
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extern void free_filespec(struct diff_filespec *);
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extern void fill_filespec(struct diff_filespec *, const unsigned char *,
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unsigned short);
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extern int diff_populate_filespec(struct diff_filespec *, int);
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extern void diff_free_filespec_data(struct diff_filespec *);
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extern void diff_free_filespec_blob(struct diff_filespec *);
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extern int diff_filespec_is_binary(struct diff_filespec *);
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struct diff_filepair {
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struct diff_filespec *one;
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struct diff_filespec *two;
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unsigned short int score;
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char status; /* M C R N D U (see Documentation/diff-format.txt) */
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unsigned broken_pair : 1;
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unsigned renamed_pair : 1;
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unsigned is_unmerged : 1;
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};
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#define DIFF_PAIR_UNMERGED(p) ((p)->is_unmerged)
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#define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
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#define DIFF_PAIR_BROKEN(p) \
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( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
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((p)->broken_pair != 0) )
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#define DIFF_PAIR_TYPE_CHANGED(p) \
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((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
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#define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
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extern void diff_free_filepair(struct diff_filepair *);
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extern int diff_unmodified_pair(struct diff_filepair *);
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struct diff_queue_struct {
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struct diff_filepair **queue;
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int alloc;
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int nr;
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};
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extern struct diff_queue_struct diff_queued_diff;
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extern struct diff_filepair *diff_queue(struct diff_queue_struct *,
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struct diff_filespec *,
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struct diff_filespec *);
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extern void diff_q(struct diff_queue_struct *, struct diff_filepair *);
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extern void diffcore_pathspec(const char **pathspec);
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extern void diffcore_break(int);
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extern void diffcore_rename(struct diff_options *);
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extern void diffcore_merge_broken(void);
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extern void diffcore_pickaxe(const char *needle, int opts);
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extern void diffcore_order(const char *orderfile);
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#define DIFF_DEBUG 0
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#if DIFF_DEBUG
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void diff_debug_filespec(struct diff_filespec *, int, const char *);
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void diff_debug_filepair(const struct diff_filepair *, int);
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void diff_debug_queue(const char *, struct diff_queue_struct *);
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#else
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#define diff_debug_filespec(a,b,c) do {} while(0)
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#define diff_debug_filepair(a,b) do {} while(0)
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#define diff_debug_queue(a,b) do {} while(0)
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#endif
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extern int diffcore_count_changes(struct diff_filespec *src,
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struct diff_filespec *dst,
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void **src_count_p,
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void **dst_count_p,
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unsigned long delta_limit,
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unsigned long *src_copied,
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unsigned long *literal_added);
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#endif
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