2012-03-27 23:13:14 +00:00
|
|
|
/* go-map-delete.c -- delete an entry from a map.
|
|
|
|
|
|
|
|
|
|
Copyright 2009 The Go Authors. All rights reserved.
|
|
|
|
|
Use of this source code is governed by a BSD-style
|
|
|
|
|
license that can be found in the LICENSE file. */
|
|
|
|
|
|
|
|
|
|
#include <stddef.h>
|
|
|
|
|
#include <stdlib.h>
|
|
|
|
|
|
|
|
|
|
#include "runtime.h"
|
|
|
|
|
#include "go-alloc.h"
|
|
|
|
|
#include "go-assert.h"
|
|
|
|
|
#include "map.h"
|
|
|
|
|
|
|
|
|
|
/* Delete the entry matching KEY from MAP. */
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
__go_map_delete (struct __go_map *map, const void *key)
|
|
|
|
|
{
|
|
|
|
|
const struct __go_map_descriptor *descriptor;
|
|
|
|
|
const struct __go_type_descriptor *key_descriptor;
|
|
|
|
|
uintptr_t key_offset;
|
|
|
|
|
_Bool (*equalfn) (const void*, const void*, uintptr_t);
|
|
|
|
|
size_t key_hash;
|
|
|
|
|
size_t key_size;
|
|
|
|
|
size_t bucket_index;
|
|
|
|
|
void **pentry;
|
|
|
|
|
|
|
|
|
|
if (map == NULL)
|
2014-09-21 17:33:12 +00:00
|
|
|
return;
|
2012-03-27 23:13:14 +00:00
|
|
|
|
|
|
|
|
descriptor = map->__descriptor;
|
|
|
|
|
|
|
|
|
|
key_descriptor = descriptor->__map_descriptor->__key_type;
|
|
|
|
|
key_offset = descriptor->__key_offset;
|
|
|
|
|
key_size = key_descriptor->__size;
|
|
|
|
|
__go_assert (key_size != 0 && key_size != -1UL);
|
|
|
|
|
equalfn = key_descriptor->__equalfn;
|
|
|
|
|
|
|
|
|
|
key_hash = key_descriptor->__hashfn (key, key_size);
|
|
|
|
|
bucket_index = key_hash % map->__bucket_count;
|
|
|
|
|
|
|
|
|
|
pentry = map->__buckets + bucket_index;
|
|
|
|
|
while (*pentry != NULL)
|
|
|
|
|
{
|
|
|
|
|
char *entry = (char *) *pentry;
|
|
|
|
|
if (equalfn (key, entry + key_offset, key_size))
|
|
|
|
|
{
|
|
|
|
|
*pentry = *(void **) entry;
|
|
|
|
|
__go_free (entry);
|
|
|
|
|
map->__element_count -= 1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
pentry = (void **) entry;
|
|
|
|
|
}
|
|
|
|
|
}
|
