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Merge branch 'sg/line-log-tree-diff-optim'

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Optimize unnecessary full-tree diff away from "git log -L" machinery.

* sg/line-log-tree-diff-optim:
  line-log: avoid unnecessary full tree diffs
  line-log: extract pathspec parsing from line ranges into a helper function
This commit is contained in:
Junio C Hamano
2019-09-18 11:50:09 -07:00
parent 95486229e3 a2bb801f6a
commit de67293e74
2 changed files with 134 additions and 19 deletions
Download Patch File Download Diff File Expand all files Collapse all files

69
line-log.c
View File

@ -737,6 +737,38 @@ static struct line_log_data *lookup_line_range(struct rev_info *revs,
return ret; return ret;
} }
static int same_paths_in_pathspec_and_range(struct pathspec *pathspec,
struct line_log_data *range)
{
int i;
struct line_log_data *r;
for (i = 0, r = range; i < pathspec->nr && r; i++, r = r->next)
if (strcmp(pathspec->items[i].match, r->path))
return 0;
if (i < pathspec->nr || r)
/* different number of pathspec items and ranges */
return 0;
return 1;
}
static void parse_pathspec_from_ranges(struct pathspec *pathspec,
struct line_log_data *range)
{
struct line_log_data *r;
struct argv_array array = ARGV_ARRAY_INIT;
const char **paths;
for (r = range; r; r = r->next)
argv_array_push(&array, r->path);
paths = argv_array_detach(&array);
parse_pathspec(pathspec, 0, PATHSPEC_PREFER_FULL, "", paths);
/* strings are now owned by pathspec */
free(paths);
}
void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args) void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args)
{ {
struct commit *commit = NULL; struct commit *commit = NULL;
@ -746,20 +778,7 @@ void line_log_init(struct rev_info *rev, const char *prefix, struct string_list
range = parse_lines(rev->diffopt.repo, commit, prefix, args); range = parse_lines(rev->diffopt.repo, commit, prefix, args);
add_line_range(rev, commit, range); add_line_range(rev, commit, range);
if (!rev->diffopt.detect_rename) { parse_pathspec_from_ranges(&rev->diffopt.pathspec, range);
struct line_log_data *r;
struct argv_array array = ARGV_ARRAY_INIT;
const char **paths;
for (r = range; r; r = r->next)
argv_array_push(&array, r->path);
paths = argv_array_detach(&array);
parse_pathspec(&rev->diffopt.pathspec, 0,
PATHSPEC_PREFER_FULL, "", paths);
/* strings are now owned by pathspec */
free(paths);
}
} }
static void move_diff_queue(struct diff_queue_struct *dst, static void move_diff_queue(struct diff_queue_struct *dst,
@ -817,14 +836,28 @@ static void queue_diffs(struct line_log_data *range,
struct diff_queue_struct *queue, struct diff_queue_struct *queue,
struct commit *commit, struct commit *parent) struct commit *commit, struct commit *parent)
{ {
struct object_id *tree_oid, *parent_tree_oid;
assert(commit); assert(commit);
tree_oid = get_commit_tree_oid(commit);
parent_tree_oid = parent ? get_commit_tree_oid(parent) : NULL;
if (opt->detect_rename &&
!same_paths_in_pathspec_and_range(&opt->pathspec, range)) {
clear_pathspec(&opt->pathspec);
parse_pathspec_from_ranges(&opt->pathspec, range);
}
DIFF_QUEUE_CLEAR(&diff_queued_diff); DIFF_QUEUE_CLEAR(&diff_queued_diff);
diff_tree_oid(parent ? get_commit_tree_oid(parent) : NULL, diff_tree_oid(parent_tree_oid, tree_oid, "", opt);
get_commit_tree_oid(commit), "", opt); if (opt->detect_rename && diff_might_be_rename()) {
if (opt->detect_rename) { /* must look at the full tree diff to detect renames */
clear_pathspec(&opt->pathspec);
DIFF_QUEUE_CLEAR(&diff_queued_diff);
diff_tree_oid(parent_tree_oid, tree_oid, "", opt);
filter_diffs_for_paths(range, 1); filter_diffs_for_paths(range, 1);
if (diff_might_be_rename())
diffcore_std(opt); diffcore_std(opt);
filter_diffs_for_paths(range, 0); filter_diffs_for_paths(range, 0);
} }

82
t/t4211-line-log.sh
View File

@ -132,4 +132,86 @@ test_expect_success '--raw is forbidden' '
test_must_fail git log -L1,24:b.c --raw test_must_fail git log -L1,24:b.c --raw
' '
test_expect_success 'setup for checking fancy rename following' '
git checkout --orphan moves-start &&
git reset --hard &&
printf "%s\n" 12 13 14 15 b c d e >file-1 &&
printf "%s\n" 22 23 24 25 B C D E >file-2 &&
git add file-1 file-2 &&
test_tick &&
git commit -m "Add file-1 and file-2" &&
oid_add_f1_f2=$(git rev-parse --short HEAD) &&
git checkout -b moves-main &&
printf "%s\n" 11 12 13 14 15 b c d e >file-1 &&
git commit -a -m "Modify file-1 on main" &&
oid_mod_f1_main=$(git rev-parse --short HEAD) &&
printf "%s\n" 21 22 23 24 25 B C D E >file-2 &&
git commit -a -m "Modify file-2 on main #1" &&
oid_mod_f2_main_1=$(git rev-parse --short HEAD) &&
git mv file-1 renamed-1 &&
git commit -m "Rename file-1 to renamed-1 on main" &&
printf "%s\n" 11 12 13 14 15 b c d e f >renamed-1 &&
git commit -a -m "Modify renamed-1 on main" &&
oid_mod_r1_main=$(git rev-parse --short HEAD) &&
printf "%s\n" 21 22 23 24 25 B C D E F >file-2 &&
git commit -a -m "Modify file-2 on main #2" &&
oid_mod_f2_main_2=$(git rev-parse --short HEAD) &&
git checkout -b moves-side moves-start &&
printf "%s\n" 12 13 14 15 16 b c d e >file-1 &&
git commit -a -m "Modify file-1 on side #1" &&
oid_mod_f1_side_1=$(git rev-parse --short HEAD) &&
printf "%s\n" 22 23 24 25 26 B C D E >file-2 &&
git commit -a -m "Modify file-2 on side" &&
oid_mod_f2_side=$(git rev-parse --short HEAD) &&
git mv file-2 renamed-2 &&
git commit -m "Rename file-2 to renamed-2 on side" &&
printf "%s\n" 12 13 14 15 16 a b c d e >file-1 &&
git commit -a -m "Modify file-1 on side #2" &&
oid_mod_f1_side_2=$(git rev-parse --short HEAD) &&
printf "%s\n" 22 23 24 25 26 A B C D E >renamed-2 &&
git commit -a -m "Modify renamed-2 on side" &&
oid_mod_r2_side=$(git rev-parse --short HEAD) &&
git checkout moves-main &&
git merge moves-side &&
oid_merge=$(git rev-parse --short HEAD)
'
test_expect_success 'fancy rename following #1' '
cat >expect <<-EOF &&
$oid_merge Merge branch '\''moves-side'\'' into moves-main
$oid_mod_f1_side_2 Modify file-1 on side #2
$oid_mod_f1_side_1 Modify file-1 on side #1
$oid_mod_r1_main Modify renamed-1 on main
$oid_mod_f1_main Modify file-1 on main
$oid_add_f1_f2 Add file-1 and file-2
EOF
git log -L1:renamed-1 --oneline --no-patch >actual &&
test_cmp expect actual
'
test_expect_success 'fancy rename following #2' '
cat >expect <<-EOF &&
$oid_merge Merge branch '\''moves-side'\'' into moves-main
$oid_mod_r2_side Modify renamed-2 on side
$oid_mod_f2_side Modify file-2 on side
$oid_mod_f2_main_2 Modify file-2 on main #2
$oid_mod_f2_main_1 Modify file-2 on main #1
$oid_add_f1_f2 Add file-1 and file-2
EOF
git log -L1:renamed-2 --oneline --no-patch >actual &&
test_cmp expect actual
'
test_done test_done