1346 lines
40 KiB
C
1346 lines
40 KiB
C
/*
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*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "object-store.h"
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#include "hashmap.h"
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#include "progress.h"
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#include "promisor-remote.h"
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#include "strmap.h"
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/* Table of rename/copy destinations */
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static struct diff_rename_dst {
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struct diff_filepair *p;
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struct diff_filespec *filespec_to_free;
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int is_rename; /* false -> just a create; true -> rename or copy */
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} *rename_dst;
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static int rename_dst_nr, rename_dst_alloc;
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/* Mapping from break source pathname to break destination index */
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static struct strintmap *break_idx = NULL;
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static struct diff_rename_dst *locate_rename_dst(struct diff_filepair *p)
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{
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/* Lookup by p->ONE->path */
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int idx = break_idx ? strintmap_get(break_idx, p->one->path) : -1;
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return (idx == -1) ? NULL : &rename_dst[idx];
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}
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/*
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* Returns 0 on success, -1 if we found a duplicate.
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*/
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static int add_rename_dst(struct diff_filepair *p)
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{
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ALLOC_GROW(rename_dst, rename_dst_nr + 1, rename_dst_alloc);
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rename_dst[rename_dst_nr].p = p;
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rename_dst[rename_dst_nr].filespec_to_free = NULL;
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rename_dst[rename_dst_nr].is_rename = 0;
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rename_dst_nr++;
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return 0;
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}
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/* Table of rename/copy src files */
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static struct diff_rename_src {
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struct diff_filepair *p;
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unsigned short score; /* to remember the break score */
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} *rename_src;
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static int rename_src_nr, rename_src_alloc;
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static void register_rename_src(struct diff_filepair *p)
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{
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if (p->broken_pair) {
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if (!break_idx) {
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break_idx = xmalloc(sizeof(*break_idx));
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strintmap_init(break_idx, -1);
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}
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strintmap_set(break_idx, p->one->path, rename_dst_nr);
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}
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ALLOC_GROW(rename_src, rename_src_nr + 1, rename_src_alloc);
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rename_src[rename_src_nr].p = p;
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rename_src[rename_src_nr].score = p->score;
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rename_src_nr++;
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}
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static int basename_same(struct diff_filespec *src, struct diff_filespec *dst)
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{
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int src_len = strlen(src->path), dst_len = strlen(dst->path);
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while (src_len && dst_len) {
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char c1 = src->path[--src_len];
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char c2 = dst->path[--dst_len];
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if (c1 != c2)
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return 0;
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if (c1 == '/')
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return 1;
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}
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return (!src_len || src->path[src_len - 1] == '/') &&
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(!dst_len || dst->path[dst_len - 1] == '/');
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}
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struct diff_score {
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int src; /* index in rename_src */
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int dst; /* index in rename_dst */
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unsigned short score;
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short name_score;
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};
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struct prefetch_options {
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struct repository *repo;
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int skip_unmodified;
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};
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static void prefetch(void *prefetch_options)
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{
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struct prefetch_options *options = prefetch_options;
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int i;
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struct oid_array to_fetch = OID_ARRAY_INIT;
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for (i = 0; i < rename_dst_nr; i++) {
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if (rename_dst[i].p->renamed_pair)
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/*
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* The loop in diffcore_rename() will not need these
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* blobs, so skip prefetching.
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*/
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continue; /* already found exact match */
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diff_add_if_missing(options->repo, &to_fetch,
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rename_dst[i].p->two);
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}
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for (i = 0; i < rename_src_nr; i++) {
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if (options->skip_unmodified &&
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diff_unmodified_pair(rename_src[i].p))
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/*
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* The loop in diffcore_rename() will not need these
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* blobs, so skip prefetching.
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*/
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continue;
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diff_add_if_missing(options->repo, &to_fetch,
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rename_src[i].p->one);
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}
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promisor_remote_get_direct(options->repo, to_fetch.oid, to_fetch.nr);
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oid_array_clear(&to_fetch);
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}
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static int estimate_similarity(struct repository *r,
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struct diff_filespec *src,
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struct diff_filespec *dst,
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int minimum_score,
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int skip_unmodified)
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{
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/* src points at a file that existed in the original tree (or
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* optionally a file in the destination tree) and dst points
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* at a newly created file. They may be quite similar, in which
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* case we want to say src is renamed to dst or src is copied into
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* dst, and then some edit has been applied to dst.
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*
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* Compare them and return how similar they are, representing
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* the score as an integer between 0 and MAX_SCORE.
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*
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* When there is an exact match, it is considered a better
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* match than anything else; the destination does not even
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* call into this function in that case.
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*/
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unsigned long max_size, delta_size, base_size, src_copied, literal_added;
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int score;
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struct diff_populate_filespec_options dpf_options = {
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.check_size_only = 1
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};
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struct prefetch_options prefetch_options = {r, skip_unmodified};
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if (r == the_repository && has_promisor_remote()) {
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dpf_options.missing_object_cb = prefetch;
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dpf_options.missing_object_data = &prefetch_options;
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}
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/* We deal only with regular files. Symlink renames are handled
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* only when they are exact matches --- in other words, no edits
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* after renaming.
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*/
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if (!S_ISREG(src->mode) || !S_ISREG(dst->mode))
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return 0;
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/*
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* Need to check that source and destination sizes are
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* filled in before comparing them.
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*
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* If we already have "cnt_data" filled in, we know it's
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* all good (avoid checking the size for zero, as that
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* is a possible size - we really should have a flag to
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* say whether the size is valid or not!)
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*/
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if (!src->cnt_data &&
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diff_populate_filespec(r, src, &dpf_options))
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return 0;
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if (!dst->cnt_data &&
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diff_populate_filespec(r, dst, &dpf_options))
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return 0;
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max_size = ((src->size > dst->size) ? src->size : dst->size);
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base_size = ((src->size < dst->size) ? src->size : dst->size);
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delta_size = max_size - base_size;
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/* We would not consider edits that change the file size so
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* drastically. delta_size must be smaller than
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* (MAX_SCORE-minimum_score)/MAX_SCORE * min(src->size, dst->size).
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*
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* Note that base_size == 0 case is handled here already
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* and the final score computation below would not have a
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* divide-by-zero issue.
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*/
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if (max_size * (MAX_SCORE-minimum_score) < delta_size * MAX_SCORE)
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return 0;
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dpf_options.check_size_only = 0;
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if (!src->cnt_data && diff_populate_filespec(r, src, &dpf_options))
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return 0;
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if (!dst->cnt_data && diff_populate_filespec(r, dst, &dpf_options))
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return 0;
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if (diffcore_count_changes(r, src, dst,
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&src->cnt_data, &dst->cnt_data,
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&src_copied, &literal_added))
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return 0;
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/* How similar are they?
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* what percentage of material in dst are from source?
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*/
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if (!dst->size)
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score = 0; /* should not happen */
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else
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score = (int)(src_copied * MAX_SCORE / max_size);
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return score;
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}
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static void record_rename_pair(int dst_index, int src_index, int score)
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{
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struct diff_filepair *src = rename_src[src_index].p;
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struct diff_filepair *dst = rename_dst[dst_index].p;
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if (dst->renamed_pair)
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die("internal error: dst already matched.");
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src->one->rename_used++;
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src->one->count++;
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rename_dst[dst_index].filespec_to_free = dst->one;
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rename_dst[dst_index].is_rename = 1;
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dst->one = src->one;
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dst->renamed_pair = 1;
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if (!strcmp(dst->one->path, dst->two->path))
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dst->score = rename_src[src_index].score;
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else
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dst->score = score;
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}
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/*
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* We sort the rename similarity matrix with the score, in descending
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* order (the most similar first).
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*/
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static int score_compare(const void *a_, const void *b_)
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{
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const struct diff_score *a = a_, *b = b_;
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/* sink the unused ones to the bottom */
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if (a->dst < 0)
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return (0 <= b->dst);
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else if (b->dst < 0)
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return -1;
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if (a->score == b->score)
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return b->name_score - a->name_score;
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return b->score - a->score;
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}
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struct file_similarity {
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struct hashmap_entry entry;
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int index;
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struct diff_filespec *filespec;
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};
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static unsigned int hash_filespec(struct repository *r,
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struct diff_filespec *filespec)
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{
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if (!filespec->oid_valid) {
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if (diff_populate_filespec(r, filespec, NULL))
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return 0;
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hash_object_file(r->hash_algo, filespec->data, filespec->size,
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"blob", &filespec->oid);
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}
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return oidhash(&filespec->oid);
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}
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static int find_identical_files(struct hashmap *srcs,
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int dst_index,
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struct diff_options *options)
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{
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int renames = 0;
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struct diff_filespec *target = rename_dst[dst_index].p->two;
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struct file_similarity *p, *best = NULL;
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int i = 100, best_score = -1;
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unsigned int hash = hash_filespec(options->repo, target);
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/*
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* Find the best source match for specified destination.
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*/
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p = hashmap_get_entry_from_hash(srcs, hash, NULL,
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struct file_similarity, entry);
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hashmap_for_each_entry_from(srcs, p, entry) {
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int score;
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struct diff_filespec *source = p->filespec;
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/* False hash collision? */
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if (!oideq(&source->oid, &target->oid))
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continue;
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/* Non-regular files? If so, the modes must match! */
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if (!S_ISREG(source->mode) || !S_ISREG(target->mode)) {
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if (source->mode != target->mode)
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continue;
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}
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/* Give higher scores to sources that haven't been used already */
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score = !source->rename_used;
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if (source->rename_used && options->detect_rename != DIFF_DETECT_COPY)
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continue;
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score += basename_same(source, target);
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if (score > best_score) {
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best = p;
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best_score = score;
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if (score == 2)
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break;
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}
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/* Too many identical alternatives? Pick one */
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if (!--i)
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break;
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}
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if (best) {
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record_rename_pair(dst_index, best->index, MAX_SCORE);
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renames++;
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}
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return renames;
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}
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static void insert_file_table(struct repository *r,
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struct hashmap *table, int index,
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struct diff_filespec *filespec)
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{
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struct file_similarity *entry = xmalloc(sizeof(*entry));
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entry->index = index;
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entry->filespec = filespec;
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hashmap_entry_init(&entry->entry, hash_filespec(r, filespec));
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hashmap_add(table, &entry->entry);
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}
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/*
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* Find exact renames first.
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*
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* The first round matches up the up-to-date entries,
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* and then during the second round we try to match
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* cache-dirty entries as well.
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*/
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static int find_exact_renames(struct diff_options *options)
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{
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int i, renames = 0;
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struct hashmap file_table;
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/* Add all sources to the hash table in reverse order, because
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* later on they will be retrieved in LIFO order.
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*/
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hashmap_init(&file_table, NULL, NULL, rename_src_nr);
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for (i = rename_src_nr-1; i >= 0; i--)
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insert_file_table(options->repo,
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&file_table, i,
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rename_src[i].p->one);
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/* Walk the destinations and find best source match */
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for (i = 0; i < rename_dst_nr; i++)
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renames += find_identical_files(&file_table, i, options);
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/* Free the hash data structure and entries */
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hashmap_clear_and_free(&file_table, struct file_similarity, entry);
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return renames;
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}
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struct dir_rename_info {
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struct strintmap idx_map;
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struct strmap dir_rename_guess;
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struct strmap *dir_rename_count;
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struct strset *relevant_source_dirs;
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unsigned setup;
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};
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static char *get_dirname(const char *filename)
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{
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char *slash = strrchr(filename, '/');
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return slash ? xstrndup(filename, slash - filename) : xstrdup("");
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}
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static void dirname_munge(char *filename)
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{
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char *slash = strrchr(filename, '/');
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if (!slash)
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slash = filename;
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*slash = '\0';
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}
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static const char *get_highest_rename_path(struct strintmap *counts)
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{
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int highest_count = 0;
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const char *highest_destination_dir = NULL;
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struct hashmap_iter iter;
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struct strmap_entry *entry;
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strintmap_for_each_entry(counts, &iter, entry) {
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const char *destination_dir = entry->key;
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intptr_t count = (intptr_t)entry->value;
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if (count > highest_count) {
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highest_count = count;
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highest_destination_dir = destination_dir;
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}
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}
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return highest_destination_dir;
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}
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static void increment_count(struct dir_rename_info *info,
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char *old_dir,
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char *new_dir)
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{
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struct strintmap *counts;
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struct strmap_entry *e;
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/* Get the {new_dirs -> counts} mapping using old_dir */
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e = strmap_get_entry(info->dir_rename_count, old_dir);
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if (e) {
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counts = e->value;
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} else {
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counts = xmalloc(sizeof(*counts));
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strintmap_init_with_options(counts, 0, NULL, 1);
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strmap_put(info->dir_rename_count, old_dir, counts);
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}
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/* Increment the count for new_dir */
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strintmap_incr(counts, new_dir, 1);
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}
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static void update_dir_rename_counts(struct dir_rename_info *info,
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struct strset *dirs_removed,
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const char *oldname,
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const char *newname)
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{
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char *old_dir = xstrdup(oldname);
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char *new_dir = xstrdup(newname);
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char new_dir_first_char = new_dir[0];
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int first_time_in_loop = 1;
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if (!info->setup)
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/*
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* info->setup is 0 here in two cases: (1) all auxiliary
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* vars (like dirs_removed) were NULL so
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* initialize_dir_rename_info() returned early, or (2)
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* either break detection or copy detection are active so
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* that we never called initialize_dir_rename_info(). In
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* the former case, we don't have enough info to know if
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* directories were renamed (because dirs_removed lets us
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* know about a necessary prerequisite, namely if they were
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* removed), and in the latter, we don't care about
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* directory renames or find_basename_matches.
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*
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* This matters because both basename and inexact matching
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* will also call update_dir_rename_counts(). In either of
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* the above two cases info->dir_rename_counts will not
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* have been properly initialized which prevents us from
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* updating it, but in these two cases we don't care about
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* dir_rename_counts anyway, so we can just exit early.
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*/
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return;
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while (1) {
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/* Get old_dir, skip if its directory isn't relevant. */
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dirname_munge(old_dir);
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if (info->relevant_source_dirs &&
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!strset_contains(info->relevant_source_dirs, old_dir))
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break;
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/* Get new_dir */
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dirname_munge(new_dir);
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/*
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* When renaming
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* "a/b/c/d/e/foo.c" -> "a/b/some/thing/else/e/foo.c"
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* then this suggests that both
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* a/b/c/d/e/ => a/b/some/thing/else/e/
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* a/b/c/d/ => a/b/some/thing/else/
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* so we want to increment counters for both. We do NOT,
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* however, also want to suggest that there was the following
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* rename:
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* a/b/c/ => a/b/some/thing/
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* so we need to quit at that point.
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*
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* Note the when first_time_in_loop, we only strip off the
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* basename, and we don't care if that's different.
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*/
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if (!first_time_in_loop) {
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char *old_sub_dir = strchr(old_dir, '\0')+1;
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char *new_sub_dir = strchr(new_dir, '\0')+1;
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if (!*new_dir) {
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/*
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* Special case when renaming to root directory,
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* i.e. when new_dir == "". In this case, we had
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* something like
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* a/b/subdir => subdir
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* and so dirname_munge() sets things up so that
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* old_dir = "a/b\0subdir\0"
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* new_dir = "\0ubdir\0"
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* We didn't have a '/' to overwrite a '\0' onto
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* in new_dir, so we have to compare differently.
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*/
|
|
if (new_dir_first_char != old_sub_dir[0] ||
|
|
strcmp(old_sub_dir+1, new_sub_dir))
|
|
break;
|
|
} else {
|
|
if (strcmp(old_sub_dir, new_sub_dir))
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (strset_contains(dirs_removed, old_dir))
|
|
increment_count(info, old_dir, new_dir);
|
|
else
|
|
break;
|
|
|
|
/* If we hit toplevel directory ("") for old or new dir, quit */
|
|
if (!*old_dir || !*new_dir)
|
|
break;
|
|
|
|
first_time_in_loop = 0;
|
|
}
|
|
|
|
/* Free resources we don't need anymore */
|
|
free(old_dir);
|
|
free(new_dir);
|
|
}
|
|
|
|
static void initialize_dir_rename_info(struct dir_rename_info *info,
|
|
struct strset *dirs_removed,
|
|
struct strmap *dir_rename_count)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *entry;
|
|
int i;
|
|
|
|
if (!dirs_removed) {
|
|
info->setup = 0;
|
|
return;
|
|
}
|
|
info->setup = 1;
|
|
|
|
info->dir_rename_count = dir_rename_count;
|
|
if (!info->dir_rename_count) {
|
|
info->dir_rename_count = xmalloc(sizeof(*dir_rename_count));
|
|
strmap_init(info->dir_rename_count);
|
|
}
|
|
strintmap_init_with_options(&info->idx_map, -1, NULL, 0);
|
|
strmap_init_with_options(&info->dir_rename_guess, NULL, 0);
|
|
|
|
/* Setup info->relevant_source_dirs */
|
|
info->relevant_source_dirs = dirs_removed;
|
|
|
|
/*
|
|
* Loop setting up both info->idx_map, and doing setup of
|
|
* info->dir_rename_count.
|
|
*/
|
|
for (i = 0; i < rename_dst_nr; ++i) {
|
|
/*
|
|
* For non-renamed files, make idx_map contain mapping of
|
|
* filename -> index (index within rename_dst, that is)
|
|
*/
|
|
if (!rename_dst[i].is_rename) {
|
|
char *filename = rename_dst[i].p->two->path;
|
|
strintmap_set(&info->idx_map, filename, i);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* For everything else (i.e. renamed files), make
|
|
* dir_rename_count contain a map of a map:
|
|
* old_directory -> {new_directory -> count}
|
|
* In other words, for every pair look at the directories for
|
|
* the old filename and the new filename and count how many
|
|
* times that pairing occurs.
|
|
*/
|
|
update_dir_rename_counts(info, dirs_removed,
|
|
rename_dst[i].p->one->path,
|
|
rename_dst[i].p->two->path);
|
|
}
|
|
|
|
/*
|
|
* Now we collapse
|
|
* dir_rename_count: old_directory -> {new_directory -> count}
|
|
* down to
|
|
* dir_rename_guess: old_directory -> best_new_directory
|
|
* where best_new_directory is the one with the highest count.
|
|
*/
|
|
strmap_for_each_entry(info->dir_rename_count, &iter, entry) {
|
|
/* entry->key is source_dir */
|
|
struct strintmap *counts = entry->value;
|
|
char *best_newdir;
|
|
|
|
best_newdir = xstrdup(get_highest_rename_path(counts));
|
|
strmap_put(&info->dir_rename_guess, entry->key,
|
|
best_newdir);
|
|
}
|
|
}
|
|
|
|
void partial_clear_dir_rename_count(struct strmap *dir_rename_count)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *entry;
|
|
|
|
strmap_for_each_entry(dir_rename_count, &iter, entry) {
|
|
struct strintmap *counts = entry->value;
|
|
strintmap_clear(counts);
|
|
}
|
|
strmap_partial_clear(dir_rename_count, 1);
|
|
}
|
|
|
|
static void cleanup_dir_rename_info(struct dir_rename_info *info,
|
|
struct strset *dirs_removed,
|
|
int keep_dir_rename_count)
|
|
{
|
|
struct hashmap_iter iter;
|
|
struct strmap_entry *entry;
|
|
struct string_list to_remove = STRING_LIST_INIT_NODUP;
|
|
int i;
|
|
|
|
if (!info->setup)
|
|
return;
|
|
|
|
/* idx_map */
|
|
strintmap_clear(&info->idx_map);
|
|
|
|
/* dir_rename_guess */
|
|
strmap_clear(&info->dir_rename_guess, 1);
|
|
|
|
/* dir_rename_count */
|
|
if (!keep_dir_rename_count) {
|
|
partial_clear_dir_rename_count(info->dir_rename_count);
|
|
strmap_clear(info->dir_rename_count, 1);
|
|
FREE_AND_NULL(info->dir_rename_count);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Although dir_rename_count was passed in
|
|
* diffcore_rename_extended() and we want to keep it around and
|
|
* return it to that caller, we first want to remove any data
|
|
* associated with directories that weren't renamed.
|
|
*/
|
|
strmap_for_each_entry(info->dir_rename_count, &iter, entry) {
|
|
const char *source_dir = entry->key;
|
|
struct strintmap *counts = entry->value;
|
|
|
|
if (!strset_contains(dirs_removed, source_dir)) {
|
|
string_list_append(&to_remove, source_dir);
|
|
strintmap_clear(counts);
|
|
continue;
|
|
}
|
|
}
|
|
for (i = 0; i < to_remove.nr; ++i)
|
|
strmap_remove(info->dir_rename_count,
|
|
to_remove.items[i].string, 1);
|
|
string_list_clear(&to_remove, 0);
|
|
}
|
|
|
|
static const char *get_basename(const char *filename)
|
|
{
|
|
/*
|
|
* gitbasename() has to worry about special drives, multiple
|
|
* directory separator characters, trailing slashes, NULL or
|
|
* empty strings, etc. We only work on filenames as stored in
|
|
* git, and thus get to ignore all those complications.
|
|
*/
|
|
const char *base = strrchr(filename, '/');
|
|
return base ? base + 1 : filename;
|
|
}
|
|
|
|
static int idx_possible_rename(char *filename, struct dir_rename_info *info)
|
|
{
|
|
/*
|
|
* Our comparison of files with the same basename (see
|
|
* find_basename_matches() below), is only helpful when after exact
|
|
* rename detection we have exactly one file with a given basename
|
|
* among the rename sources and also only exactly one file with
|
|
* that basename among the rename destinations. When we have
|
|
* multiple files with the same basename in either set, we do not
|
|
* know which to compare against. However, there are some
|
|
* filenames that occur in large numbers (particularly
|
|
* build-related filenames such as 'Makefile', '.gitignore', or
|
|
* 'build.gradle' that potentially exist within every single
|
|
* subdirectory), and for performance we want to be able to quickly
|
|
* find renames for these files too.
|
|
*
|
|
* The reason basename comparisons are a useful heuristic was that it
|
|
* is common for people to move files across directories while keeping
|
|
* their filename the same. If we had a way of determining or even
|
|
* making a good educated guess about which directory these non-unique
|
|
* basename files had moved the file to, we could check it.
|
|
* Luckily...
|
|
*
|
|
* When an entire directory is in fact renamed, we have two factors
|
|
* helping us out:
|
|
* (a) the original directory disappeared giving us a hint
|
|
* about when we can apply an extra heuristic.
|
|
* (a) we often have several files within that directory and
|
|
* subdirectories that are renamed without changes
|
|
* So, rules for a heuristic:
|
|
* (0) If there basename matches are non-unique (the condition under
|
|
* which this function is called) AND
|
|
* (1) the directory in which the file was found has disappeared
|
|
* (i.e. dirs_removed is non-NULL and has a relevant entry) THEN
|
|
* (2) use exact renames of files within the directory to determine
|
|
* where the directory is likely to have been renamed to. IF
|
|
* there is at least one exact rename from within that
|
|
* directory, we can proceed.
|
|
* (3) If there are multiple places the directory could have been
|
|
* renamed to based on exact renames, ignore all but one of them.
|
|
* Just use the destination with the most renames going to it.
|
|
* (4) Check if applying that directory rename to the original file
|
|
* would result in a destination filename that is in the
|
|
* potential rename set. If so, return the index of the
|
|
* destination file (the index within rename_dst).
|
|
* (5) Compare the original file and returned destination for
|
|
* similarity, and if they are sufficiently similar, record the
|
|
* rename.
|
|
*
|
|
* This function, idx_possible_rename(), is only responsible for (4).
|
|
* The conditions/steps in (1)-(3) are handled via setting up
|
|
* dir_rename_count and dir_rename_guess in
|
|
* initialize_dir_rename_info(). Steps (0) and (5) are handled by
|
|
* the caller of this function.
|
|
*/
|
|
char *old_dir, *new_dir;
|
|
struct strbuf new_path = STRBUF_INIT;
|
|
int idx;
|
|
|
|
if (!info->setup)
|
|
return -1;
|
|
|
|
old_dir = get_dirname(filename);
|
|
new_dir = strmap_get(&info->dir_rename_guess, old_dir);
|
|
free(old_dir);
|
|
if (!new_dir)
|
|
return -1;
|
|
|
|
strbuf_addstr(&new_path, new_dir);
|
|
strbuf_addch(&new_path, '/');
|
|
strbuf_addstr(&new_path, get_basename(filename));
|
|
|
|
idx = strintmap_get(&info->idx_map, new_path.buf);
|
|
strbuf_release(&new_path);
|
|
return idx;
|
|
}
|
|
|
|
static int find_basename_matches(struct diff_options *options,
|
|
int minimum_score,
|
|
struct dir_rename_info *info,
|
|
struct strset *dirs_removed)
|
|
{
|
|
/*
|
|
* When I checked in early 2020, over 76% of file renames in linux
|
|
* just moved files to a different directory but kept the same
|
|
* basename. gcc did that with over 64% of renames, gecko did it
|
|
* with over 79%, and WebKit did it with over 89%.
|
|
*
|
|
* Therefore we can bypass the normal exhaustive NxM matrix
|
|
* comparison of similarities between all potential rename sources
|
|
* and destinations by instead using file basename as a hint (i.e.
|
|
* the portion of the filename after the last '/'), checking for
|
|
* similarity between files with the same basename, and if we find
|
|
* a pair that are sufficiently similar, record the rename pair and
|
|
* exclude those two from the NxM matrix.
|
|
*
|
|
* This *might* cause us to find a less than optimal pairing (if
|
|
* there is another file that we are even more similar to but has a
|
|
* different basename). Given the huge performance advantage
|
|
* basename matching provides, and given the frequency with which
|
|
* people use the same basename in real world projects, that's a
|
|
* trade-off we are willing to accept when doing just rename
|
|
* detection.
|
|
*
|
|
* If someone wants copy detection that implies they are willing to
|
|
* spend more cycles to find similarities between files, so it may
|
|
* be less likely that this heuristic is wanted. If someone is
|
|
* doing break detection, that means they do not want filename
|
|
* similarity to imply any form of content similiarity, and thus
|
|
* this heuristic would definitely be incompatible.
|
|
*/
|
|
|
|
int i, renames = 0;
|
|
struct strintmap sources;
|
|
struct strintmap dests;
|
|
|
|
/*
|
|
* The prefeteching stuff wants to know if it can skip prefetching
|
|
* blobs that are unmodified...and will then do a little extra work
|
|
* to verify that the oids are indeed different before prefetching.
|
|
* Unmodified blobs are only relevant when doing copy detection;
|
|
* when limiting to rename detection, diffcore_rename[_extended]()
|
|
* will never be called with unmodified source paths fed to us, so
|
|
* the extra work necessary to check if rename_src entries are
|
|
* unmodified would be a small waste.
|
|
*/
|
|
int skip_unmodified = 0;
|
|
|
|
/*
|
|
* Create maps of basename -> fullname(s) for remaining sources and
|
|
* dests.
|
|
*/
|
|
strintmap_init_with_options(&sources, -1, NULL, 0);
|
|
strintmap_init_with_options(&dests, -1, NULL, 0);
|
|
for (i = 0; i < rename_src_nr; ++i) {
|
|
char *filename = rename_src[i].p->one->path;
|
|
const char *base;
|
|
|
|
/* exact renames removed in remove_unneeded_paths_from_src() */
|
|
assert(!rename_src[i].p->one->rename_used);
|
|
|
|
/* Record index within rename_src (i) if basename is unique */
|
|
base = get_basename(filename);
|
|
if (strintmap_contains(&sources, base))
|
|
strintmap_set(&sources, base, -1);
|
|
else
|
|
strintmap_set(&sources, base, i);
|
|
}
|
|
for (i = 0; i < rename_dst_nr; ++i) {
|
|
char *filename = rename_dst[i].p->two->path;
|
|
const char *base;
|
|
|
|
if (rename_dst[i].is_rename)
|
|
continue; /* involved in exact match already. */
|
|
|
|
/* Record index within rename_dst (i) if basename is unique */
|
|
base = get_basename(filename);
|
|
if (strintmap_contains(&dests, base))
|
|
strintmap_set(&dests, base, -1);
|
|
else
|
|
strintmap_set(&dests, base, i);
|
|
}
|
|
|
|
/* Now look for basename matchups and do similarity estimation */
|
|
for (i = 0; i < rename_src_nr; ++i) {
|
|
char *filename = rename_src[i].p->one->path;
|
|
const char *base = NULL;
|
|
intptr_t src_index;
|
|
intptr_t dst_index;
|
|
|
|
/*
|
|
* If the basename is unique among remaining sources, then
|
|
* src_index will equal 'i' and we can attempt to match it
|
|
* to a unique basename in the destinations. Otherwise,
|
|
* use directory rename heuristics, if possible.
|
|
*/
|
|
base = get_basename(filename);
|
|
src_index = strintmap_get(&sources, base);
|
|
assert(src_index == -1 || src_index == i);
|
|
|
|
if (strintmap_contains(&dests, base)) {
|
|
struct diff_filespec *one, *two;
|
|
int score;
|
|
|
|
/* Find a matching destination, if possible */
|
|
dst_index = strintmap_get(&dests, base);
|
|
if (src_index == -1 || dst_index == -1) {
|
|
src_index = i;
|
|
dst_index = idx_possible_rename(filename, info);
|
|
}
|
|
if (dst_index == -1)
|
|
continue;
|
|
|
|
/* Ignore this dest if already used in a rename */
|
|
if (rename_dst[dst_index].is_rename)
|
|
continue; /* already used previously */
|
|
|
|
/* Estimate the similarity */
|
|
one = rename_src[src_index].p->one;
|
|
two = rename_dst[dst_index].p->two;
|
|
score = estimate_similarity(options->repo, one, two,
|
|
minimum_score, skip_unmodified);
|
|
|
|
/* If sufficiently similar, record as rename pair */
|
|
if (score < minimum_score)
|
|
continue;
|
|
record_rename_pair(dst_index, src_index, score);
|
|
renames++;
|
|
update_dir_rename_counts(info, dirs_removed,
|
|
one->path, two->path);
|
|
|
|
/*
|
|
* Found a rename so don't need text anymore; if we
|
|
* didn't find a rename, the filespec_blob would get
|
|
* re-used when doing the matrix of comparisons.
|
|
*/
|
|
diff_free_filespec_blob(one);
|
|
diff_free_filespec_blob(two);
|
|
}
|
|
}
|
|
|
|
strintmap_clear(&sources);
|
|
strintmap_clear(&dests);
|
|
|
|
return renames;
|
|
}
|
|
|
|
#define NUM_CANDIDATE_PER_DST 4
|
|
static void record_if_better(struct diff_score m[], struct diff_score *o)
|
|
{
|
|
int i, worst;
|
|
|
|
/* find the worst one */
|
|
worst = 0;
|
|
for (i = 1; i < NUM_CANDIDATE_PER_DST; i++)
|
|
if (score_compare(&m[i], &m[worst]) > 0)
|
|
worst = i;
|
|
|
|
/* is it better than the worst one? */
|
|
if (score_compare(&m[worst], o) > 0)
|
|
m[worst] = *o;
|
|
}
|
|
|
|
/*
|
|
* Returns:
|
|
* 0 if we are under the limit;
|
|
* 1 if we need to disable inexact rename detection;
|
|
* 2 if we would be under the limit if we were given -C instead of -C -C.
|
|
*/
|
|
static int too_many_rename_candidates(int num_destinations, int num_sources,
|
|
struct diff_options *options)
|
|
{
|
|
int rename_limit = options->rename_limit;
|
|
int i, limited_sources;
|
|
|
|
options->needed_rename_limit = 0;
|
|
|
|
/*
|
|
* This basically does a test for the rename matrix not
|
|
* growing larger than a "rename_limit" square matrix, ie:
|
|
*
|
|
* num_destinations * num_sources > rename_limit * rename_limit
|
|
*
|
|
* We use st_mult() to check overflow conditions; in the
|
|
* exceptional circumstance that size_t isn't large enough to hold
|
|
* the multiplication, the system won't be able to allocate enough
|
|
* memory for the matrix anyway.
|
|
*/
|
|
if (rename_limit <= 0)
|
|
rename_limit = 32767;
|
|
if (st_mult(num_destinations, num_sources)
|
|
<= st_mult(rename_limit, rename_limit))
|
|
return 0;
|
|
|
|
options->needed_rename_limit =
|
|
num_sources > num_destinations ? num_sources : num_destinations;
|
|
|
|
/* Are we running under -C -C? */
|
|
if (!options->flags.find_copies_harder)
|
|
return 1;
|
|
|
|
/* Would we bust the limit if we were running under -C? */
|
|
for (limited_sources = i = 0; i < num_sources; i++) {
|
|
if (diff_unmodified_pair(rename_src[i].p))
|
|
continue;
|
|
limited_sources++;
|
|
}
|
|
if (st_mult(num_destinations, limited_sources)
|
|
<= st_mult(rename_limit, rename_limit))
|
|
return 2;
|
|
return 1;
|
|
}
|
|
|
|
static int find_renames(struct diff_score *mx,
|
|
int dst_cnt,
|
|
int minimum_score,
|
|
int copies,
|
|
struct dir_rename_info *info,
|
|
struct strset *dirs_removed)
|
|
{
|
|
int count = 0, i;
|
|
|
|
for (i = 0; i < dst_cnt * NUM_CANDIDATE_PER_DST; i++) {
|
|
struct diff_rename_dst *dst;
|
|
|
|
if ((mx[i].dst < 0) ||
|
|
(mx[i].score < minimum_score))
|
|
break; /* there is no more usable pair. */
|
|
dst = &rename_dst[mx[i].dst];
|
|
if (dst->is_rename)
|
|
continue; /* already done, either exact or fuzzy. */
|
|
if (!copies && rename_src[mx[i].src].p->one->rename_used)
|
|
continue;
|
|
record_rename_pair(mx[i].dst, mx[i].src, mx[i].score);
|
|
count++;
|
|
update_dir_rename_counts(info, dirs_removed,
|
|
rename_src[mx[i].src].p->one->path,
|
|
rename_dst[mx[i].dst].p->two->path);
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static void remove_unneeded_paths_from_src(int detecting_copies)
|
|
{
|
|
int i, new_num_src;
|
|
|
|
if (detecting_copies)
|
|
return; /* nothing to remove */
|
|
if (break_idx)
|
|
return; /* culling incompatible with break detection */
|
|
|
|
/*
|
|
* Note on reasons why we cull unneeded sources but not destinations:
|
|
* 1) Pairings are stored in rename_dst (not rename_src), which we
|
|
* need to keep around. So, we just can't cull rename_dst even
|
|
* if we wanted to. But doing so wouldn't help because...
|
|
*
|
|
* 2) There is a matrix pairwise comparison that follows the
|
|
* "Performing inexact rename detection" progress message.
|
|
* Iterating over the destinations is done in the outer loop,
|
|
* hence we only iterate over each of those once and we can
|
|
* easily skip the outer loop early if the destination isn't
|
|
* relevant. That's only one check per destination path to
|
|
* skip.
|
|
*
|
|
* By contrast, the sources are iterated in the inner loop; if
|
|
* we check whether a source can be skipped, then we'll be
|
|
* checking it N separate times, once for each destination.
|
|
* We don't want to have to iterate over known-not-needed
|
|
* sources N times each, so avoid that by removing the sources
|
|
* from rename_src here.
|
|
*/
|
|
for (i = 0, new_num_src = 0; i < rename_src_nr; i++) {
|
|
/*
|
|
* renames are stored in rename_dst, so if a rename has
|
|
* already been detected using this source, we can just
|
|
* remove the source knowing rename_dst has its info.
|
|
*/
|
|
if (rename_src[i].p->one->rename_used)
|
|
continue;
|
|
|
|
if (new_num_src < i)
|
|
memcpy(&rename_src[new_num_src], &rename_src[i],
|
|
sizeof(struct diff_rename_src));
|
|
new_num_src++;
|
|
}
|
|
|
|
rename_src_nr = new_num_src;
|
|
}
|
|
|
|
void diffcore_rename_extended(struct diff_options *options,
|
|
struct strset *dirs_removed,
|
|
struct strmap *dir_rename_count)
|
|
{
|
|
int detect_rename = options->detect_rename;
|
|
int minimum_score = options->rename_score;
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
struct diff_queue_struct outq;
|
|
struct diff_score *mx;
|
|
int i, j, rename_count, skip_unmodified = 0;
|
|
int num_destinations, dst_cnt;
|
|
int num_sources, want_copies;
|
|
struct progress *progress = NULL;
|
|
struct dir_rename_info info;
|
|
|
|
trace2_region_enter("diff", "setup", options->repo);
|
|
info.setup = 0;
|
|
assert(!dir_rename_count || strmap_empty(dir_rename_count));
|
|
want_copies = (detect_rename == DIFF_DETECT_COPY);
|
|
if (dirs_removed && (break_idx || want_copies))
|
|
BUG("dirs_removed incompatible with break/copy detection");
|
|
if (!minimum_score)
|
|
minimum_score = DEFAULT_RENAME_SCORE;
|
|
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
if (!DIFF_FILE_VALID(p->one)) {
|
|
if (!DIFF_FILE_VALID(p->two))
|
|
continue; /* unmerged */
|
|
else if (options->single_follow &&
|
|
strcmp(options->single_follow, p->two->path))
|
|
continue; /* not interested */
|
|
else if (!options->flags.rename_empty &&
|
|
is_empty_blob_oid(&p->two->oid))
|
|
continue;
|
|
else if (add_rename_dst(p) < 0) {
|
|
warning("skipping rename detection, detected"
|
|
" duplicate destination '%s'",
|
|
p->two->path);
|
|
goto cleanup;
|
|
}
|
|
}
|
|
else if (!options->flags.rename_empty &&
|
|
is_empty_blob_oid(&p->one->oid))
|
|
continue;
|
|
else if (!DIFF_PAIR_UNMERGED(p) && !DIFF_FILE_VALID(p->two)) {
|
|
/*
|
|
* If the source is a broken "delete", and
|
|
* they did not really want to get broken,
|
|
* that means the source actually stays.
|
|
* So we increment the "rename_used" score
|
|
* by one, to indicate ourselves as a user
|
|
*/
|
|
if (p->broken_pair && !p->score)
|
|
p->one->rename_used++;
|
|
register_rename_src(p);
|
|
}
|
|
else if (want_copies) {
|
|
/*
|
|
* Increment the "rename_used" score by
|
|
* one, to indicate ourselves as a user.
|
|
*/
|
|
p->one->rename_used++;
|
|
register_rename_src(p);
|
|
}
|
|
}
|
|
trace2_region_leave("diff", "setup", options->repo);
|
|
if (rename_dst_nr == 0 || rename_src_nr == 0)
|
|
goto cleanup; /* nothing to do */
|
|
|
|
trace2_region_enter("diff", "exact renames", options->repo);
|
|
/*
|
|
* We really want to cull the candidates list early
|
|
* with cheap tests in order to avoid doing deltas.
|
|
*/
|
|
rename_count = find_exact_renames(options);
|
|
trace2_region_leave("diff", "exact renames", options->repo);
|
|
|
|
/* Did we only want exact renames? */
|
|
if (minimum_score == MAX_SCORE)
|
|
goto cleanup;
|
|
|
|
num_sources = rename_src_nr;
|
|
|
|
if (want_copies || break_idx) {
|
|
/*
|
|
* Cull sources:
|
|
* - remove ones corresponding to exact renames
|
|
*/
|
|
trace2_region_enter("diff", "cull after exact", options->repo);
|
|
remove_unneeded_paths_from_src(want_copies);
|
|
trace2_region_leave("diff", "cull after exact", options->repo);
|
|
} else {
|
|
/* Determine minimum score to match basenames */
|
|
double factor = 0.5;
|
|
char *basename_factor = getenv("GIT_BASENAME_FACTOR");
|
|
int min_basename_score;
|
|
|
|
if (basename_factor)
|
|
factor = strtol(basename_factor, NULL, 10)/100.0;
|
|
assert(factor >= 0.0 && factor <= 1.0);
|
|
min_basename_score = minimum_score +
|
|
(int)(factor * (MAX_SCORE - minimum_score));
|
|
|
|
/*
|
|
* Cull sources:
|
|
* - remove ones involved in renames (found via exact match)
|
|
*/
|
|
trace2_region_enter("diff", "cull after exact", options->repo);
|
|
remove_unneeded_paths_from_src(want_copies);
|
|
trace2_region_leave("diff", "cull after exact", options->repo);
|
|
|
|
/* Preparation for basename-driven matching. */
|
|
trace2_region_enter("diff", "dir rename setup", options->repo);
|
|
initialize_dir_rename_info(&info,
|
|
dirs_removed, dir_rename_count);
|
|
trace2_region_leave("diff", "dir rename setup", options->repo);
|
|
|
|
/* Utilize file basenames to quickly find renames. */
|
|
trace2_region_enter("diff", "basename matches", options->repo);
|
|
rename_count += find_basename_matches(options,
|
|
min_basename_score,
|
|
&info, dirs_removed);
|
|
trace2_region_leave("diff", "basename matches", options->repo);
|
|
|
|
/*
|
|
* Cull sources, again:
|
|
* - remove ones involved in renames (found via basenames)
|
|
*/
|
|
trace2_region_enter("diff", "cull basename", options->repo);
|
|
remove_unneeded_paths_from_src(want_copies);
|
|
trace2_region_leave("diff", "cull basename", options->repo);
|
|
}
|
|
|
|
/* Calculate how many rename destinations are left */
|
|
num_destinations = (rename_dst_nr - rename_count);
|
|
num_sources = rename_src_nr; /* rename_src_nr reflects lower number */
|
|
|
|
/* All done? */
|
|
if (!num_destinations || !num_sources)
|
|
goto cleanup;
|
|
|
|
switch (too_many_rename_candidates(num_destinations, num_sources,
|
|
options)) {
|
|
case 1:
|
|
goto cleanup;
|
|
case 2:
|
|
options->degraded_cc_to_c = 1;
|
|
skip_unmodified = 1;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
trace2_region_enter("diff", "inexact renames", options->repo);
|
|
if (options->show_rename_progress) {
|
|
progress = start_delayed_progress(
|
|
_("Performing inexact rename detection"),
|
|
(uint64_t)num_destinations * (uint64_t)num_sources);
|
|
}
|
|
|
|
CALLOC_ARRAY(mx, st_mult(NUM_CANDIDATE_PER_DST, num_destinations));
|
|
for (dst_cnt = i = 0; i < rename_dst_nr; i++) {
|
|
struct diff_filespec *two = rename_dst[i].p->two;
|
|
struct diff_score *m;
|
|
|
|
if (rename_dst[i].is_rename)
|
|
continue; /* exact or basename match already handled */
|
|
|
|
m = &mx[dst_cnt * NUM_CANDIDATE_PER_DST];
|
|
for (j = 0; j < NUM_CANDIDATE_PER_DST; j++)
|
|
m[j].dst = -1;
|
|
|
|
for (j = 0; j < rename_src_nr; j++) {
|
|
struct diff_filespec *one = rename_src[j].p->one;
|
|
struct diff_score this_src;
|
|
|
|
assert(!one->rename_used || want_copies || break_idx);
|
|
|
|
if (skip_unmodified &&
|
|
diff_unmodified_pair(rename_src[j].p))
|
|
continue;
|
|
|
|
this_src.score = estimate_similarity(options->repo,
|
|
one, two,
|
|
minimum_score,
|
|
skip_unmodified);
|
|
this_src.name_score = basename_same(one, two);
|
|
this_src.dst = i;
|
|
this_src.src = j;
|
|
record_if_better(m, &this_src);
|
|
/*
|
|
* Once we run estimate_similarity,
|
|
* We do not need the text anymore.
|
|
*/
|
|
diff_free_filespec_blob(one);
|
|
diff_free_filespec_blob(two);
|
|
}
|
|
dst_cnt++;
|
|
display_progress(progress,
|
|
(uint64_t)dst_cnt * (uint64_t)num_sources);
|
|
}
|
|
stop_progress(&progress);
|
|
|
|
/* cost matrix sorted by most to least similar pair */
|
|
STABLE_QSORT(mx, dst_cnt * NUM_CANDIDATE_PER_DST, score_compare);
|
|
|
|
rename_count += find_renames(mx, dst_cnt, minimum_score, 0,
|
|
&info, dirs_removed);
|
|
if (want_copies)
|
|
rename_count += find_renames(mx, dst_cnt, minimum_score, 1,
|
|
&info, dirs_removed);
|
|
free(mx);
|
|
trace2_region_leave("diff", "inexact renames", options->repo);
|
|
|
|
cleanup:
|
|
/* At this point, we have found some renames and copies and they
|
|
* are recorded in rename_dst. The original list is still in *q.
|
|
*/
|
|
trace2_region_enter("diff", "write back to queue", options->repo);
|
|
DIFF_QUEUE_CLEAR(&outq);
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
struct diff_filepair *pair_to_free = NULL;
|
|
|
|
if (DIFF_PAIR_UNMERGED(p)) {
|
|
diff_q(&outq, p);
|
|
}
|
|
else if (!DIFF_FILE_VALID(p->one) && DIFF_FILE_VALID(p->two)) {
|
|
/* Creation */
|
|
diff_q(&outq, p);
|
|
}
|
|
else if (DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two)) {
|
|
/*
|
|
* Deletion
|
|
*
|
|
* We would output this delete record if:
|
|
*
|
|
* (1) this is a broken delete and the counterpart
|
|
* broken create remains in the output; or
|
|
* (2) this is not a broken delete, and rename_dst
|
|
* does not have a rename/copy to move p->one->path
|
|
* out of existence.
|
|
*
|
|
* Otherwise, the counterpart broken create
|
|
* has been turned into a rename-edit; or
|
|
* delete did not have a matching create to
|
|
* begin with.
|
|
*/
|
|
if (DIFF_PAIR_BROKEN(p)) {
|
|
/* broken delete */
|
|
struct diff_rename_dst *dst = locate_rename_dst(p);
|
|
if (!dst)
|
|
BUG("tracking failed somehow; failed to find associated dst for broken pair");
|
|
if (dst->is_rename)
|
|
/* counterpart is now rename/copy */
|
|
pair_to_free = p;
|
|
}
|
|
else {
|
|
if (p->one->rename_used)
|
|
/* this path remains */
|
|
pair_to_free = p;
|
|
}
|
|
|
|
if (!pair_to_free)
|
|
diff_q(&outq, p);
|
|
}
|
|
else if (!diff_unmodified_pair(p))
|
|
/* all the usual ones need to be kept */
|
|
diff_q(&outq, p);
|
|
else
|
|
/* no need to keep unmodified pairs; FIXME: remove earlier? */
|
|
pair_to_free = p;
|
|
|
|
if (pair_to_free)
|
|
diff_free_filepair(pair_to_free);
|
|
}
|
|
diff_debug_queue("done copying original", &outq);
|
|
|
|
free(q->queue);
|
|
*q = outq;
|
|
diff_debug_queue("done collapsing", q);
|
|
|
|
for (i = 0; i < rename_dst_nr; i++)
|
|
if (rename_dst[i].filespec_to_free)
|
|
free_filespec(rename_dst[i].filespec_to_free);
|
|
|
|
cleanup_dir_rename_info(&info, dirs_removed, dir_rename_count != NULL);
|
|
FREE_AND_NULL(rename_dst);
|
|
rename_dst_nr = rename_dst_alloc = 0;
|
|
FREE_AND_NULL(rename_src);
|
|
rename_src_nr = rename_src_alloc = 0;
|
|
if (break_idx) {
|
|
strintmap_clear(break_idx);
|
|
FREE_AND_NULL(break_idx);
|
|
}
|
|
trace2_region_leave("diff", "write back to queue", options->repo);
|
|
return;
|
|
}
|
|
|
|
void diffcore_rename(struct diff_options *options)
|
|
{
|
|
diffcore_rename_extended(options, NULL, NULL);
|
|
}
|