Keep track of all recognized macros in the new "maybe_macro" field.
If this field is true, it _may_ be a macro (depending on what's in the
current attr stack). But if the field is false, it's definitely not a
macro, no need to go through the whole attr stack in macroexpand_one()
to search for one.
Without this, "git grep abcdefghi" on git.git hits the inner loop in
macroexpand_one() 2481 times. With this, it's 66 times.
Helped-by: Eric Sunshine <sunshine@xxxxxxxxxxxxxx>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
attr.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/attr.c b/attr.c
index a1758bf..b80e52b 100644
--- a/attr.c
+++ b/attr.c
@@ -32,6 +32,7 @@ struct git_attr {
struct git_attr *next;
unsigned h;
int attr_nr;
+ int maybe_macro;
char name[FLEX_ARRAY];
};
static int attr_nr;
@@ -95,6 +96,7 @@ 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;
git_attr_hash[pos] = a;
REALLOC_ARRAY(check_all_attr, attr_nr);
@@ -244,9 +246,10 @@ 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;
@@ -687,7 +690,8 @@ static int macroexpand_one(int nr, int rem)
struct match_attr *a = NULL;
int i;
- if (check_all_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)
--
2.2.0.84.ge9c7a8a
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