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authorNguyễn Thái Ngọc Duy <pclouds@gmail.com>2012-11-24 11:33:50 +0700
committerJunio C Hamano <gitster@pobox.com>2012-11-26 11:13:13 -0800
commit8c6abbcd2720dd80b1c9b6db8104c4dcc7cba6c7 (patch)
tree9ee9ada92c4cb6bf3f8e5874d20664cf46a3e0b4
parent5d74762d87859d08fdf4c87ec9387e31e097acba (diff)
downloadgit-8c6abbcd2720dd80b1c9b6db8104c4dcc7cba6c7.tar.gz
pathspec: apply "*.c" optimization from exclude
When a pattern contains only a single asterisk as wildcard, e.g. "foo*bar", after literally comparing the leading part "foo" with the string, we can compare the tail of the string and make sure it matches "bar", instead of running fnmatch() on "*bar" against the remainder of the string. -O2 build on linux-2.6, without the patch: $ time git rev-list --quiet HEAD -- '*.c' real 0m40.770s user 0m40.290s sys 0m0.256s With the patch $ time ~/w/git/git rev-list --quiet HEAD -- '*.c' real 0m34.288s user 0m33.997s sys 0m0.205s The above command is not supposed to be widely popular. It's chosen because it exercises pathspec matching a lot. The point is it cuts down matching time for popular patterns like *.c, which could be used as pathspec in other places. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--cache.h3
-rw-r--r--dir.c18
-rw-r--r--dir.h1
-rw-r--r--tree-walk.c6
4 files changed, 24 insertions, 4 deletions
diff --git a/cache.h b/cache.h
index bf031f133c..babf9e54c9 100644
--- a/cache.h
+++ b/cache.h
@@ -473,6 +473,8 @@ extern int index_name_is_other(const struct index_state *, const char *, int);
extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
+#define PATHSPEC_ONESTAR 1 /* the pathspec pattern sastisfies GFNM_ONESTAR */
+
struct pathspec {
const char **raw; /* get_pathspec() result, not freed by free_pathspec() */
int nr;
@@ -483,6 +485,7 @@ struct pathspec {
const char *match;
int len;
int nowildcard_len;
+ int flags;
} *items;
};
diff --git a/dir.c b/dir.c
index f81e1d2917..9afd388604 100644
--- a/dir.c
+++ b/dir.c
@@ -46,6 +46,13 @@ inline int git_fnmatch(const char *pattern, const char *string,
pattern += prefix;
string += prefix;
}
+ if (flags & GFNM_ONESTAR) {
+ int pattern_len = strlen(++pattern);
+ int string_len = strlen(string);
+ return string_len < pattern_len ||
+ strcmp(pattern,
+ string + string_len - pattern_len);
+ }
return fnmatch(pattern, string, fnm_flags);
}
@@ -246,7 +253,9 @@ static int match_pathspec_item(const struct pathspec_item *item, int prefix,
}
if (item->nowildcard_len < item->len &&
- !git_fnmatch(match, name, 0, item->nowildcard_len - prefix))
+ !git_fnmatch(match, name,
+ item->flags & PATHSPEC_ONESTAR ? GFNM_ONESTAR : 0,
+ item->nowildcard_len - prefix))
return MATCHED_FNMATCH;
return 0;
@@ -1446,8 +1455,13 @@ int init_pathspec(struct pathspec *pathspec, const char **paths)
item->match = path;
item->len = strlen(path);
item->nowildcard_len = simple_length(path);
- if (item->nowildcard_len < item->len)
+ item->flags = 0;
+ if (item->nowildcard_len < item->len) {
pathspec->has_wildcard = 1;
+ if (path[item->nowildcard_len] == '*' &&
+ no_wildcard(path + item->nowildcard_len + 1))
+ item->flags |= PATHSPEC_ONESTAR;
+ }
}
qsort(pathspec->items, pathspec->nr,
diff --git a/dir.h b/dir.h
index 0e8ae84628..ab5af42b2e 100644
--- a/dir.h
+++ b/dir.h
@@ -143,6 +143,7 @@ extern int fnmatch_icase(const char *pattern, const char *string, int flags);
* The prefix part of pattern must not contains wildcards.
*/
#define GFNM_PATHNAME 1 /* similar to FNM_PATHNAME */
+#define GFNM_ONESTAR 2 /* there is only _one_ wildcard, a star */
extern int git_fnmatch(const char *pattern, const char *string,
int flags, int prefix);
diff --git a/tree-walk.c b/tree-walk.c
index 2fcf3c02da..585899ea24 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -628,7 +628,8 @@ enum interesting tree_entry_interesting(const struct name_entry *entry,
if (item->nowildcard_len < item->len) {
if (!git_fnmatch(match + baselen, entry->path,
- 0, item->nowildcard_len - baselen))
+ item->flags & PATHSPEC_ONESTAR ? GFNM_ONESTAR : 0,
+ item->nowildcard_len - baselen))
return entry_interesting;
/*
@@ -654,7 +655,8 @@ match_wildcards:
strbuf_add(base, entry->path, pathlen);
if (!git_fnmatch(match, base->buf + base_offset,
- 0, item->nowildcard_len)) {
+ item->flags & PATHSPEC_ONESTAR ? GFNM_ONESTAR : 0,
+ item->nowildcard_len)) {
strbuf_setlen(base, base_offset + baselen);
return entry_interesting;
}