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/*
+----------------------------------------------------------------------+
| Copyright (c) The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: krakjoe@php.net |
+----------------------------------------------------------------------+
*/
#ifndef ZEND_WEAKREFS_H
#define ZEND_WEAKREFS_H
#include "zend_alloc.h"
BEGIN_EXTERN_C()
extern ZEND_API zend_class_entry *zend_ce_weakref;
void zend_register_weakref_ce(void);
void zend_weakrefs_init(void);
void zend_weakrefs_shutdown(void);
ZEND_API void zend_weakrefs_notify(zend_object *object);
ZEND_API zval *zend_weakrefs_hash_add(HashTable *ht, zend_object *key, zval *pData);
ZEND_API zend_result zend_weakrefs_hash_del(HashTable *ht, zend_object *key);
static zend_always_inline void *zend_weakrefs_hash_add_ptr(HashTable *ht, zend_object *key, void *ptr) {
zval tmp, *zv;
ZVAL_PTR(&tmp, ptr);
if ((zv = zend_weakrefs_hash_add(ht, key, &tmp))) {
return Z_PTR_P(zv);
} else {
return NULL;
}
}
/* Because php uses the raw numbers as a hash function, raw pointers will lead to hash collisions.
* We have a guarantee that the lowest ZEND_MM_ALIGNED_OFFSET_LOG2 bits of a pointer are zero.
*
* E.g. On most 64-bit platforms, pointers are aligned to 8 bytes, so the least significant 3 bits are always 0 and can be discarded.
*
* NOTE: This function is only used for EG(weakrefs) and zend_weakmap->ht.
* It is not used for the HashTable instances associated with ZEND_WEAKREF_TAG_HT tags (created in zend_weakref_register, which uses ZEND_WEAKREF_ENCODE instead).
* The ZEND_WEAKREF_TAG_HT instances are used to disambiguate between multiple weak references to the same zend_object.
*/
static zend_always_inline zend_ulong zend_object_to_weakref_key(const zend_object *object)
{
ZEND_ASSERT(((uintptr_t)object) % ZEND_MM_ALIGNMENT == 0);
return ((uintptr_t) object) >> ZEND_MM_ALIGNMENT_LOG2;
}
static zend_always_inline zend_object *zend_weakref_key_to_object(zend_ulong key)
{
return (zend_object *) (((uintptr_t) key) << ZEND_MM_ALIGNMENT_LOG2);
}
END_EXTERN_C()
#endif
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