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grep: cache userdiff_driver in grep_source 

Right now, grep only uses the userdiff_driver for one thing:
looking up funcname patterns for "-p" and "-W".  As new uses
for userdiff drivers are added to the grep code, we want to
minimize attribute lookups, which can be expensive.

It might seem at first that this would also optimize multiple
lookups when the funcname pattern for a file is needed
multiple times. However, the compiled funcname pattern is
already cached in struct grep_opt's "priv" member, so
multiple lookups are already suppressed.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
maint
Jeff King 2012-02-02 03:20:43 -05:00 committed by Junio C Hamano
parent c876d6da88
commit 94ad9d9e07
2 changed files with 20 additions and 6 deletions
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22
grep.c
View File

@ -841,12 +841,9 @@ static int match_funcname(struct grep_opt *opt, struct grep_source *gs, char *bo
{
xdemitconf_t *xecfg = opt->priv;
if (xecfg && !xecfg->find_func) {
struct userdiff_driver *drv;
grep_attr_lock();
drv = userdiff_find_by_path(gs->name);
grep_attr_unlock();
if (drv && drv->funcname.pattern) {
const struct userdiff_funcname *pe = &drv->funcname;
grep_source_load_driver(gs);
if (gs->driver->funcname.pattern) {
const struct userdiff_funcname *pe = &gs->driver->funcname;
xdiff_set_find_func(xecfg, pe->pattern, pe->cflags);
} else {
xecfg = opt->priv = NULL;
@ -1237,6 +1234,7 @@ void grep_source_init(struct grep_source *gs, enum grep_source_type type,
gs->name = name ? xstrdup(name) : NULL;
gs->buf = NULL;
gs->size = 0;
gs->driver = NULL;

switch (type) {
case GREP_SOURCE_FILE:
@ -1340,3 +1338,15 @@ int grep_source_load(struct grep_source *gs)
}
die("BUG: invalid grep_source type");
}

void grep_source_load_driver(struct grep_source *gs)
{
if (gs->driver)
return;

grep_attr_lock();
gs->driver = userdiff_find_by_path(gs->name);
if (!gs->driver)
gs->driver = userdiff_find_by_name("default");
grep_attr_unlock();
}

4
grep.h
View File

@ -9,6 +9,7 @@ typedef int pcre_extra;
#endif
#include "kwset.h"
#include "thread-utils.h"
#include "userdiff.h"

enum grep_pat_token {
GREP_PATTERN,
@ -141,6 +142,8 @@ struct grep_source {

char *buf;
unsigned long size;

struct userdiff_driver *driver;
};

void grep_source_init(struct grep_source *gs, enum grep_source_type type,
@ -148,6 +151,7 @@ void grep_source_init(struct grep_source *gs, enum grep_source_type type,
int grep_source_load(struct grep_source *gs);
void grep_source_clear_data(struct grep_source *gs);
void grep_source_clear(struct grep_source *gs);
void grep_source_load_driver(struct grep_source *gs);

int grep_source(struct grep_opt *opt, struct grep_source *gs);