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Conflict comparison performance enhancements

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* Add *_hash fields to conflict struct and populate them
* Remove unnecessary backwards string comparisons

Signed-off-by: Dan McGee <dan@archlinux.org>
This commit is contained in:
Dan McGee 2011-08-08 23:25:45 -05:00
parent 76dfea6e83
commit ce74f76a4c
2 changed files with 19 additions and 17 deletions
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2
lib/libalpm/alpm.h
View file

@ -151,6 +151,8 @@ typedef struct _alpm_depmissing_t {
/** Conflict */
typedef struct _alpm_conflict_t {
unsigned long package1_hash;
unsigned long package2_hash;
char *package1;
char *package2;
char *reason;

34
lib/libalpm/conflict.c
View file

@ -41,15 +41,17 @@
#include "log.h"
#include "deps.h"
static alpm_conflict_t *conflict_new(const char *package1, const char *package2,
static alpm_conflict_t *conflict_new(alpm_pkg_t *pkg1, alpm_pkg_t *pkg2,
const char *reason)
{
alpm_conflict_t *conflict;
MALLOC(conflict, sizeof(alpm_conflict_t), return NULL);
STRDUP(conflict->package1, package1, return NULL);
STRDUP(conflict->package2, package2, return NULL);
conflict->package1_hash = pkg1->name_hash;
conflict->package2_hash = pkg2->name_hash;
STRDUP(conflict->package1, pkg1->name, return NULL);
STRDUP(conflict->package2, pkg2->name, return NULL);
STRDUP(conflict->reason, reason, return NULL);
return conflict;
@ -68,6 +70,8 @@ alpm_conflict_t *_alpm_conflict_dup(const alpm_conflict_t *conflict)
alpm_conflict_t *newconflict;
CALLOC(newconflict, 1, sizeof(alpm_conflict_t), return NULL);
newconflict->package1_hash = conflict->package1_hash;
newconflict->package2_hash = conflict->package2_hash;
STRDUP(newconflict->package1, conflict->package1, return NULL);
STRDUP(newconflict->package2, conflict->package2, return NULL);
STRDUP(newconflict->reason, conflict->reason, return NULL);
@ -78,15 +82,12 @@ alpm_conflict_t *_alpm_conflict_dup(const alpm_conflict_t *conflict)
static int conflict_isin(alpm_conflict_t *needle, alpm_list_t *haystack)
{
alpm_list_t *i;
const char *npkg1 = needle->package1;
const char *npkg2 = needle->package2;
for(i = haystack; i; i = i->next) {
alpm_conflict_t *conflict = i->data;
const char *cpkg1 = conflict->package1;
const char *cpkg2 = conflict->package2;
if((strcmp(cpkg1, npkg1) == 0 && strcmp(cpkg2, npkg2) == 0)
|| (strcmp(cpkg1, npkg2) == 0 && strcmp(cpkg2, npkg1) == 0)) {
if(needle->package1_hash == conflict->package1_hash
&& needle->package2_hash == conflict->package2_hash
&& strcmp(needle->package1, conflict->package1) == 0
&& strcmp(needle->package2, conflict->package2) == 0) {
return 1;
}
}
@ -102,14 +103,14 @@ static int conflict_isin(alpm_conflict_t *needle, alpm_list_t *haystack)
* @param reason reason for this conflict
*/
static int add_conflict(alpm_handle_t *handle, alpm_list_t **baddeps,
const char *pkg1, const char *pkg2, const char *reason)
alpm_pkg_t *pkg1, alpm_pkg_t *pkg2, const char *reason)
{
alpm_conflict_t *conflict = conflict_new(pkg1, pkg2, reason);
if(!conflict) {
return -1;
}
_alpm_log(handle, ALPM_LOG_DEBUG, "package %s conflicts with %s (by %s)\n",
pkg1, pkg2, reason);
pkg1->name, pkg2->name, reason);
if(!conflict_isin(conflict, *baddeps)) {
*baddeps = alpm_list_add(*baddeps, conflict);
} else {
@ -140,7 +141,6 @@ static void check_conflict(alpm_handle_t *handle,
}
for(i = list1; i; i = i->next) {
alpm_pkg_t *pkg1 = i->data;
const char *pkg1name = alpm_pkg_get_name(pkg1);
alpm_list_t *j;
for(j = alpm_pkg_get_conflicts(pkg1); j; j = j->next) {
@ -150,18 +150,18 @@ static void check_conflict(alpm_handle_t *handle,
for(k = list2; k; k = k->next) {
alpm_pkg_t *pkg2 = k->data;
const char *pkg2name = alpm_pkg_get_name(pkg2);
if(strcmp(pkg1name, pkg2name) == 0) {
if(pkg1->name_hash == pkg2->name_hash
&& strcmp(pkg1->name, pkg2->name) == 0) {
/* skip the package we're currently processing */
continue;
}
if(_alpm_depcmp(pkg2, parsed_conflict)) {
if(order >= 0) {
add_conflict(handle, baddeps, pkg1name, pkg2name, conflict);
add_conflict(handle, baddeps, pkg1, pkg2, conflict);
} else {
add_conflict(handle, baddeps, pkg2name, pkg1name, conflict);
add_conflict(handle, baddeps, pkg2, pkg1, conflict);
}
}
}