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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 |
+----------------------------------------------------------------------+
*/
#include "zend.h"
#include "zend_interfaces.h"
#include "zend_objects_API.h"
#include "zend_weakrefs.h"
typedef struct _zend_weakref {
zend_object *referent;
zend_object std;
} zend_weakref;
zend_class_entry *zend_ce_weakref;
static zend_object_handlers zend_weakref_handlers;
#define zend_weakref_from(o) ((zend_weakref*)(((char*) o) - XtOffsetOf(zend_weakref, std)))
#define zend_weakref_fetch(z) zend_weakref_from(Z_OBJ_P(z))
static void zend_weakref_unref(zval *zv) {
zend_weakref *wr = (zend_weakref*) Z_PTR_P(zv);
GC_DEL_FLAGS(wr->referent, IS_OBJ_WEAKLY_REFERENCED);
wr->referent = NULL;
}
void zend_weakrefs_init() {
zend_hash_init(&EG(weakrefs), 8, NULL, zend_weakref_unref, 0);
}
void zend_weakrefs_notify(zend_object *object) {
zend_hash_index_del(&EG(weakrefs), (zend_ulong) object);
}
void zend_weakrefs_shutdown() {
zend_hash_destroy(&EG(weakrefs));
}
static zend_object* zend_weakref_new(zend_class_entry *ce) {
zend_weakref *wr = zend_object_alloc(sizeof(zend_weakref), zend_ce_weakref);
zend_object_std_init(&wr->std, zend_ce_weakref);
wr->std.handlers = &zend_weakref_handlers;
return &wr->std;
}
static zend_always_inline zend_bool zend_weakref_find(zval *referent, zval *return_value) {
zend_weakref *wr = zend_hash_index_find_ptr(&EG(weakrefs), (zend_ulong) Z_OBJ_P(referent));
if (!wr) {
return 0;
}
GC_ADDREF(&wr->std);
ZVAL_OBJ(return_value, &wr->std);
return 1;
}
static zend_always_inline void zend_weakref_create(zval *referent, zval *return_value) {
zend_weakref *wr;
object_init_ex(return_value, zend_ce_weakref);
wr = zend_weakref_fetch(return_value);
wr->referent = Z_OBJ_P(referent);
zend_hash_index_add_ptr(&EG(weakrefs), (zend_ulong) wr->referent, wr);
GC_ADD_FLAGS(wr->referent, IS_OBJ_WEAKLY_REFERENCED);
}
static zend_always_inline void zend_weakref_get(zval *weakref, zval *return_value) {
zend_weakref *wr = zend_weakref_fetch(weakref);
if (wr->referent) {
ZVAL_OBJ(return_value, wr->referent);
Z_ADDREF_P(return_value);
}
}
static void zend_weakref_free(zend_object *zo) {
zend_weakref *wr = zend_weakref_from(zo);
if (wr->referent) {
zend_hash_index_del(
&EG(weakrefs), (zend_ulong) wr->referent);
}
zend_object_std_dtor(&wr->std);
}
#define zend_weakref_unsupported(thing) \
zend_throw_error(NULL, "WeakReference objects do not support " thing);
static ZEND_COLD zval* zend_weakref_no_write(zend_object *object, zend_string *member, zval *value, void **rtc) {
zend_weakref_unsupported("properties");
return &EG(uninitialized_zval);
}
static ZEND_COLD zval* zend_weakref_no_read(zend_object *object, zend_string *member, int type, void **rtc, zval *rv) {
if (!EG(exception)) {
zend_weakref_unsupported("properties");
}
return &EG(uninitialized_zval);
}
static ZEND_COLD zval *zend_weakref_no_read_ptr(zend_object *object, zend_string *member, int type, void **rtc) {
zend_weakref_unsupported("property references");
return NULL;
}
static ZEND_COLD int zend_weakref_no_isset(zend_object *object, zend_string *member, int hse, void **rtc) {
if (hse != 2) {
zend_weakref_unsupported("properties");
}
return 0;
}
static ZEND_COLD void zend_weakref_no_unset(zend_object *object, zend_string *member, void **rtc) {
zend_weakref_unsupported("properties");
}
ZEND_BEGIN_ARG_WITH_RETURN_OBJ_INFO_EX(zend_weakref_create_arginfo, 0, 1, WeakReference, 0)
ZEND_ARG_TYPE_INFO(0, referent, IS_OBJECT, 0)
ZEND_END_ARG_INFO()
ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(zend_weakref_get_arginfo, 0, 0, IS_OBJECT, 1)
ZEND_END_ARG_INFO()
ZEND_COLD ZEND_METHOD(WeakReference, __construct)
{
zend_throw_error(NULL,
"Direct instantiation of 'WeakReference' is not allowed, "
"use WeakReference::create instead");
}
ZEND_METHOD(WeakReference, create)
{
zval *referent;
ZEND_PARSE_PARAMETERS_START_EX(ZEND_PARSE_PARAMS_THROW, 1,1)
Z_PARAM_OBJECT(referent)
ZEND_PARSE_PARAMETERS_END();
if (zend_weakref_find(referent, return_value)) {
return;
}
zend_weakref_create(referent, return_value);
}
ZEND_METHOD(WeakReference, get)
{
ZEND_PARSE_PARAMETERS_START_EX(ZEND_PARSE_PARAMS_THROW, 0, 0)
ZEND_PARSE_PARAMETERS_END();
zend_weakref_get(getThis(), return_value);
}
static const zend_function_entry zend_weakref_methods[] = {
ZEND_ME(WeakReference, __construct, NULL, ZEND_ACC_PUBLIC)
ZEND_ME(WeakReference, create, zend_weakref_create_arginfo, ZEND_ACC_PUBLIC|ZEND_ACC_STATIC)
ZEND_ME(WeakReference, get, zend_weakref_get_arginfo, ZEND_ACC_PUBLIC)
ZEND_FE_END
};
void zend_register_weakref_ce(void) /* {{{ */
{
zend_class_entry ce;
INIT_CLASS_ENTRY(ce, "WeakReference", zend_weakref_methods);
zend_ce_weakref = zend_register_internal_class(&ce);
zend_ce_weakref->ce_flags |= ZEND_ACC_FINAL;
zend_ce_weakref->create_object = zend_weakref_new;
zend_ce_weakref->serialize = zend_class_serialize_deny;
zend_ce_weakref->unserialize = zend_class_unserialize_deny;
memcpy(&zend_weakref_handlers, zend_get_std_object_handlers(), sizeof(zend_object_handlers));
zend_weakref_handlers.offset = XtOffsetOf(zend_weakref, std);
zend_weakref_handlers.free_obj = zend_weakref_free;
zend_weakref_handlers.read_property = zend_weakref_no_read;
zend_weakref_handlers.write_property = zend_weakref_no_write;
zend_weakref_handlers.has_property = zend_weakref_no_isset;
zend_weakref_handlers.unset_property = zend_weakref_no_unset;
zend_weakref_handlers.get_property_ptr_ptr = zend_weakref_no_read_ptr;
zend_weakref_handlers.clone_obj = NULL;
}
/* }}} */
|
