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authorDan McGee <dan@archlinux.org>2010-12-21 15:40:04 -0600
committerDan McGee <dan@archlinux.org>2010-12-21 17:25:34 -0600
commit735a197fc29b6b85a64cae5a6fa95e1209552c3b (patch)
treeffc24707b052f62ac671a75e3228dc81cf60ec59
parent34a78d935ac44fc73becc8bba213cdf0268bb5e0 (diff)
Use name hashes in depends to avoid strcmp calls
Just like we did for package name comparsions, if we add a depend name_hash field on depend struct initialization, we can use it instead of doing a string name comparison, saving us a lot of checks in the depcmp code. Signed-off-by: Dan McGee <dan@archlinux.org>
-rw-r--r--lib/libalpm/deps.c23
-rw-r--r--lib/libalpm/deps.h3
2 files changed, 18 insertions, 8 deletions
diff --git a/lib/libalpm/deps.c b/lib/libalpm/deps.c
index e37eb02e..2ed9d30a 100644
--- a/lib/libalpm/deps.c
+++ b/lib/libalpm/deps.c
@@ -322,15 +322,20 @@ static int dep_vercmp(const char *version1, pmdepmod_t mod,
int _alpm_depcmp(pmpkg_t *pkg, pmdepend_t *dep)
{
alpm_list_t *i;
- const char *pkgname = alpm_pkg_get_name(pkg);
- const char *pkgversion = alpm_pkg_get_version(pkg);
+ const char *pkgname = pkg->name;
+ const char *pkgversion = pkg->version;
int satisfy = 0;
/* check (pkg->name, pkg->version) */
- satisfy = (strcmp(pkgname, dep->name) == 0
- && dep_vercmp(pkgversion, dep->mod, dep->version));
- if(satisfy) {
- return(satisfy);
+ if(pkg->name_hash && dep->name_hash
+ && pkg->name_hash != dep->name_hash) {
+ /* skip more expensive checks */
+ } else {
+ satisfy = (strcmp(pkgname, dep->name) == 0
+ && dep_vercmp(pkgversion, dep->mod, dep->version));
+ if(satisfy) {
+ return(satisfy);
+ }
}
/* check provisions, format : "name=version" */
@@ -380,7 +385,8 @@ pmdepend_t *_alpm_splitdep(const char *depstring)
depend->mod = PM_DEP_MOD_LE;
*ptr = '\0';
ptr += 2;
- } else if((ptr = strstr(newstr, "="))) { /* Note: we must do =,<,> checks after <=, >= checks */
+ } else if((ptr = strstr(newstr, "="))) {
+ /* Note: we must do =,<,> checks after <=, >= checks */
depend->mod = PM_DEP_MOD_EQ;
*ptr = '\0';
ptr += 1;
@@ -396,6 +402,7 @@ pmdepend_t *_alpm_splitdep(const char *depstring)
/* no version specified - copy the name and return it */
depend->mod = PM_DEP_MOD_ANY;
STRDUP(depend->name, newstr, RET_ERR(PM_ERR_MEMORY, NULL));
+ depend->name_hash = _alpm_hash_sdbm(depend->name);
depend->version = NULL;
free(newstr);
return(depend);
@@ -404,6 +411,7 @@ pmdepend_t *_alpm_splitdep(const char *depstring)
/* if we get here, we have a version comparator, copy the right parts
* to the right places */
STRDUP(depend->name, newstr, RET_ERR(PM_ERR_MEMORY, NULL));
+ depend->name_hash = _alpm_hash_sdbm(depend->name);
STRDUP(depend->version, ptr, RET_ERR(PM_ERR_MEMORY, NULL));
free(newstr);
@@ -416,6 +424,7 @@ pmdepend_t *_alpm_dep_dup(const pmdepend_t *dep)
CALLOC(newdep, 1, sizeof(pmdepend_t), RET_ERR(PM_ERR_MEMORY, NULL));
STRDUP(newdep->name, dep->name, RET_ERR(PM_ERR_MEMORY, NULL));
+ newdep->name_hash = dep->name_hash;
STRDUP(newdep->version, dep->version, RET_ERR(PM_ERR_MEMORY, NULL));
newdep->mod = dep->mod;
diff --git a/lib/libalpm/deps.h b/lib/libalpm/deps.h
index 6fa763e1..b720b364 100644
--- a/lib/libalpm/deps.h
+++ b/lib/libalpm/deps.h
@@ -29,9 +29,10 @@
/* Dependency */
struct __pmdepend_t {
- pmdepmod_t mod;
char *name;
char *version;
+ long name_hash;
+ pmdepmod_t mod;
};
/* Missing dependency */