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authorJunio C Hamano <gitster@pobox.com>2015-02-25 23:40:10 (GMT)
committerJunio C Hamano <gitster@pobox.com>2015-02-25 23:40:10 (GMT)
commit50e1ba5050d56cb19be8eca323935757461597af (patch)
tree1b8560299b556d645f73ac81ec713f8b96e24049
parent32464d36bfeedb282321c0f20a84a2ce6878795c (diff)
parent06a604e67051b9342c158432a49e42a5440f9280 (diff)
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Merge branch 'nd/attr-optim'
Optimize attribute look-up, mostly useful in "git grep" on a project that does not use many attributes, by avoiding it when we (should) know that the attributes are not defined in the first place. * nd/attr-optim: attr: avoid heavy work when we know the specified attr is not defined attr: do not attempt to expand when we know it's not a macro attr.c: rename arg name attr_nr to avoid shadowing the global one
-rw-r--r--attr.c47
1 files changed, 37 insertions, 10 deletions
diff --git a/attr.c b/attr.c
index cd54697..1f9eebd 100644
--- a/attr.c
+++ b/attr.c
@@ -32,9 +32,12 @@ struct git_attr {
struct git_attr *next;
unsigned h;
int attr_nr;
+ int maybe_macro;
+ int maybe_real;
char name[FLEX_ARRAY];
};
static int attr_nr;
+static int cannot_trust_maybe_real;
static struct git_attr_check *check_all_attr;
static struct git_attr *(git_attr_hash[HASHSIZE]);
@@ -95,6 +98,8 @@ static struct git_attr *git_attr_internal(const char *name, int len)
a->h = hval;
a->next = git_attr_hash[pos];
a->attr_nr = attr_nr++;
+ a->maybe_macro = 0;
+ a->maybe_real = 0;
git_attr_hash[pos] = a;
REALLOC_ARRAY(check_all_attr, attr_nr);
@@ -244,9 +249,10 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
sizeof(*res) +
sizeof(struct attr_state) * num_attr +
(is_macro ? 0 : namelen + 1));
- if (is_macro)
+ if (is_macro) {
res->u.attr = git_attr_internal(name, namelen);
- else {
+ res->u.attr->maybe_macro = 1;
+ } else {
char *p = (char *)&(res->state[num_attr]);
memcpy(p, name, namelen);
res->u.pat.pattern = p;
@@ -266,6 +272,10 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
/* Second pass to fill the attr_states */
for (cp = states, i = 0; *cp; i++) {
cp = parse_attr(src, lineno, cp, &(res->state[i]));
+ if (!is_macro)
+ res->state[i].attr->maybe_real = 1;
+ if (res->state[i].attr->maybe_macro)
+ cannot_trust_maybe_real = 1;
}
return res;
@@ -681,13 +691,14 @@ static int fill(const char *path, int pathlen, int basename_offset,
return rem;
}
-static int macroexpand_one(int attr_nr, int rem)
+static int macroexpand_one(int nr, int rem)
{
struct attr_stack *stk;
struct match_attr *a = NULL;
int i;
- if (check_all_attr[attr_nr].value != ATTR__TRUE)
+ if (check_all_attr[nr].value != ATTR__TRUE ||
+ !check_all_attr[nr].attr->maybe_macro)
return rem;
for (stk = attr_stack; !a && stk; stk = stk->prev)
@@ -695,7 +706,7 @@ static int macroexpand_one(int attr_nr, int rem)
struct match_attr *ma = stk->attrs[i];
if (!ma->is_macro)
continue;
- if (ma->u.attr->attr_nr == attr_nr)
+ if (ma->u.attr->attr_nr == nr)
a = ma;
}
@@ -706,10 +717,13 @@ static int macroexpand_one(int attr_nr, int rem)
}
/*
- * Collect all attributes for path into the array pointed to by
- * check_all_attr.
+ * Collect attributes for path into the array pointed to by
+ * check_all_attr. If num is non-zero, only attributes in check[] are
+ * collected. Otherwise all attributes are collected.
*/
-static void collect_all_attrs(const char *path)
+static void collect_some_attrs(const char *path, int num,
+ struct git_attr_check *check)
+
{
struct attr_stack *stk;
int i, pathlen, rem, dirlen;
@@ -732,6 +746,19 @@ static void collect_all_attrs(const char *path)
prepare_attr_stack(path, dirlen);
for (i = 0; i < attr_nr; i++)
check_all_attr[i].value = ATTR__UNKNOWN;
+ if (num && !cannot_trust_maybe_real) {
+ rem = 0;
+ for (i = 0; i < num; i++) {
+ if (!check[i].attr->maybe_real) {
+ struct git_attr_check *c;
+ c = check_all_attr + check[i].attr->attr_nr;
+ c->value = ATTR__UNSET;
+ rem++;
+ }
+ }
+ if (rem == num)
+ return;
+ }
rem = attr_nr;
for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
@@ -742,7 +769,7 @@ int git_check_attr(const char *path, int num, struct git_attr_check *check)
{
int i;
- collect_all_attrs(path);
+ collect_some_attrs(path, num, check);
for (i = 0; i < num; i++) {
const char *value = check_all_attr[check[i].attr->attr_nr].value;
@@ -758,7 +785,7 @@ int git_all_attrs(const char *path, int *num, struct git_attr_check **check)
{
int i, count, j;
- collect_all_attrs(path);
+ collect_some_attrs(path, 0, NULL);
/* Count the number of attributes that are set. */
count = 0;