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418 lines (345 loc) · 12.9 KB
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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2013 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| 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: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "zend.h"
#include "zend_globals.h"
#include "zend_variables.h"
#include "zend_API.h"
#include "zend_objects_API.h"
#define ZEND_DEBUG_OBJECTS 0
ZEND_API void zend_objects_store_init(zend_objects_store *objects, zend_uint init_size)
{
objects->object_buckets = (zend_object_store_bucket *) emalloc(init_size * sizeof(zend_object_store_bucket));
objects->top = 1; /* Skip 0 so that handles are true */
objects->size = init_size;
objects->free_list_head = -1;
memset(&objects->object_buckets[0], 0, sizeof(zend_object_store_bucket));
}
ZEND_API void zend_objects_store_destroy(zend_objects_store *objects)
{
efree(objects->object_buckets);
objects->object_buckets = NULL;
}
ZEND_API void zend_objects_store_call_destructors(zend_objects_store *objects TSRMLS_DC)
{
zend_uint i = 1;
for (i = 1; i < objects->top ; i++) {
if (objects->object_buckets[i].valid) {
struct _store_object *obj = &objects->object_buckets[i].bucket.obj;
if (!objects->object_buckets[i].destructor_called) {
objects->object_buckets[i].destructor_called = 1;
if (obj->dtor && obj->object) {
obj->refcount++;
obj->dtor(obj->object, i TSRMLS_CC);
obj = &objects->object_buckets[i].bucket.obj;
obj->refcount--;
}
}
}
}
}
ZEND_API void zend_objects_store_mark_destructed(zend_objects_store *objects TSRMLS_DC)
{
zend_uint i;
if (!objects->object_buckets) {
return;
}
for (i = 1; i < objects->top ; i++) {
if (objects->object_buckets[i].valid) {
objects->object_buckets[i].destructor_called = 1;
}
}
}
ZEND_API void zend_objects_store_free_object_storage(zend_objects_store *objects TSRMLS_DC)
{
zend_uint i = 1;
for (i = 1; i < objects->top ; i++) {
if (objects->object_buckets[i].valid) {
struct _store_object *obj = &objects->object_buckets[i].bucket.obj;
GC_REMOVE_ZOBJ_FROM_BUFFER(obj);
objects->object_buckets[i].valid = 0;
if (obj->free_storage) {
obj->free_storage(obj->object TSRMLS_CC);
}
/* Not adding to free list as we are shutting down anyway */
}
}
}
/* Store objects API */
ZEND_API zend_object_handle zend_objects_store_put(void *object, zend_objects_store_dtor_t dtor, zend_objects_free_object_storage_t free_storage, zend_objects_store_clone_t clone TSRMLS_DC)
{
zend_object_handle handle;
struct _store_object *obj;
if (EG(objects_store).free_list_head != -1) {
handle = EG(objects_store).free_list_head;
EG(objects_store).free_list_head = EG(objects_store).object_buckets[handle].bucket.free_list.next;
} else {
if (EG(objects_store).top == EG(objects_store).size) {
EG(objects_store).size <<= 1;
EG(objects_store).object_buckets = (zend_object_store_bucket *) erealloc(EG(objects_store).object_buckets, EG(objects_store).size * sizeof(zend_object_store_bucket));
}
handle = EG(objects_store).top++;
}
obj = &EG(objects_store).object_buckets[handle].bucket.obj;
EG(objects_store).object_buckets[handle].destructor_called = 0;
EG(objects_store).object_buckets[handle].valid = 1;
EG(objects_store).object_buckets[handle].apply_count = 0;
obj->refcount = 1;
GC_OBJ_INIT(obj);
obj->object = object;
obj->dtor = dtor?dtor:(zend_objects_store_dtor_t)zend_objects_destroy_object;
obj->free_storage = free_storage;
obj->clone = clone;
obj->handlers = NULL;
#if ZEND_DEBUG_OBJECTS
fprintf(stderr, "Allocated object id #%d\n", handle);
#endif
return handle;
}
ZEND_API zend_uint zend_objects_store_get_refcount(zval *object TSRMLS_DC)
{
zend_object_handle handle = Z_OBJ_HANDLE_P(object);
return EG(objects_store).object_buckets[handle].bucket.obj.refcount;
}
ZEND_API void zend_objects_store_add_ref(zval *object TSRMLS_DC)
{
zend_object_handle handle = Z_OBJ_HANDLE_P(object);
EG(objects_store).object_buckets[handle].bucket.obj.refcount++;
#if ZEND_DEBUG_OBJECTS
fprintf(stderr, "Increased refcount of object id #%d\n", handle);
#endif
}
/*
* Add a reference to an objects store entry given the object handle.
*/
ZEND_API void zend_objects_store_add_ref_by_handle(zend_object_handle handle TSRMLS_DC)
{
EG(objects_store).object_buckets[handle].bucket.obj.refcount++;
}
#define ZEND_OBJECTS_STORE_ADD_TO_FREE_LIST() \
EG(objects_store).object_buckets[handle].bucket.free_list.next = EG(objects_store).free_list_head; \
EG(objects_store).free_list_head = handle; \
EG(objects_store).object_buckets[handle].valid = 0;
ZEND_API void zend_objects_store_del_ref(zval *zobject TSRMLS_DC)
{
zend_object_handle handle;
handle = Z_OBJ_HANDLE_P(zobject);
Z_ADDREF_P(zobject);
zend_objects_store_del_ref_by_handle_ex(handle, Z_OBJ_HT_P(zobject) TSRMLS_CC);
Z_DELREF_P(zobject);
GC_ZOBJ_CHECK_POSSIBLE_ROOT(zobject);
}
/*
* Delete a reference to an objects store entry given the object handle.
*/
ZEND_API void zend_objects_store_del_ref_by_handle_ex(zend_object_handle handle, const zend_object_handlers *handlers TSRMLS_DC) /* {{{ */
{
struct _store_object *obj;
int failure = 0;
if (!EG(objects_store).object_buckets) {
return;
}
obj = &EG(objects_store).object_buckets[handle].bucket.obj;
/* Make sure we hold a reference count during the destructor call
otherwise, when the destructor ends the storage might be freed
when the refcount reaches 0 a second time
*/
if (EG(objects_store).object_buckets[handle].valid) {
if (obj->refcount == 1) {
if (!EG(objects_store).object_buckets[handle].destructor_called) {
EG(objects_store).object_buckets[handle].destructor_called = 1;
if (obj->dtor) {
if (handlers && !obj->handlers) {
obj->handlers = handlers;
}
zend_try {
obj->dtor(obj->object, handle TSRMLS_CC);
} zend_catch {
failure = 1;
} zend_end_try();
}
}
/* re-read the object from the object store as the store might have been reallocated in the dtor */
obj = &EG(objects_store).object_buckets[handle].bucket.obj;
if (obj->refcount == 1) {
GC_REMOVE_ZOBJ_FROM_BUFFER(obj);
if (obj->free_storage) {
zend_try {
obj->free_storage(obj->object TSRMLS_CC);
} zend_catch {
failure = 1;
} zend_end_try();
}
ZEND_OBJECTS_STORE_ADD_TO_FREE_LIST();
}
}
}
obj->refcount--;
#if ZEND_DEBUG_OBJECTS
if (obj->refcount == 0) {
fprintf(stderr, "Deallocated object id #%d\n", handle);
} else {
fprintf(stderr, "Decreased refcount of object id #%d\n", handle);
}
#endif
if (failure) {
zend_bailout();
}
}
/* }}} */
ZEND_API zend_object_value zend_objects_store_clone_obj(zval *zobject TSRMLS_DC)
{
zend_object_value retval;
void *new_object;
struct _store_object *obj;
zend_object_handle handle = Z_OBJ_HANDLE_P(zobject);
obj = &EG(objects_store).object_buckets[handle].bucket.obj;
if (obj->clone == NULL) {
zend_error(E_CORE_ERROR, "Trying to clone uncloneable object of class %s", Z_OBJCE_P(zobject)->name);
}
obj->clone(obj->object, &new_object TSRMLS_CC);
obj = &EG(objects_store).object_buckets[handle].bucket.obj;
retval.handle = zend_objects_store_put(new_object, obj->dtor, obj->free_storage, obj->clone TSRMLS_CC);
retval.handlers = Z_OBJ_HT_P(zobject);
EG(objects_store).object_buckets[handle].bucket.obj.handlers = retval.handlers;
return retval;
}
ZEND_API void *zend_object_store_get_object(const zval *zobject TSRMLS_DC)
{
zend_object_handle handle = Z_OBJ_HANDLE_P(zobject);
return EG(objects_store).object_buckets[handle].bucket.obj.object;
}
/*
* Retrieve an entry from the objects store given the object handle.
*/
ZEND_API void *zend_object_store_get_object_by_handle(zend_object_handle handle TSRMLS_DC)
{
return EG(objects_store).object_buckets[handle].bucket.obj.object;
}
/* zend_object_store_set_object:
* It is ONLY valid to call this function from within the constructor of an
* overloaded object. Its purpose is to set the object pointer for the object
* when you can't possibly know its value until you have parsed the arguments
* from the constructor function. You MUST NOT use this function for any other
* weird games, or call it at any other time after the object is constructed.
* */
ZEND_API void zend_object_store_set_object(zval *zobject, void *object TSRMLS_DC)
{
zend_object_handle handle = Z_OBJ_HANDLE_P(zobject);
EG(objects_store).object_buckets[handle].bucket.obj.object = object;
}
/* Called when the ctor was terminated by an exception */
ZEND_API void zend_object_store_ctor_failed(zval *zobject TSRMLS_DC)
{
zend_object_handle handle = Z_OBJ_HANDLE_P(zobject);
zend_object_store_bucket *obj_bucket = &EG(objects_store).object_buckets[handle];
obj_bucket->bucket.obj.handlers = Z_OBJ_HT_P(zobject);;
obj_bucket->destructor_called = 1;
}
/* Proxy objects workings */
typedef struct _zend_proxy_object {
zval *object;
zval *property;
} zend_proxy_object;
static zend_object_handlers zend_object_proxy_handlers;
ZEND_API void zend_objects_proxy_destroy(zend_object *object, zend_object_handle handle TSRMLS_DC)
{
}
ZEND_API void zend_objects_proxy_free_storage(zend_proxy_object *object TSRMLS_DC)
{
zval_ptr_dtor(&object->object);
zval_ptr_dtor(&object->property);
efree(object);
}
ZEND_API void zend_objects_proxy_clone(zend_proxy_object *object, zend_proxy_object **object_clone TSRMLS_DC)
{
*object_clone = emalloc(sizeof(zend_proxy_object));
(*object_clone)->object = object->object;
(*object_clone)->property = object->property;
zval_add_ref(&(*object_clone)->property);
zval_add_ref(&(*object_clone)->object);
}
ZEND_API zval *zend_object_create_proxy(zval *object, zval *member TSRMLS_DC)
{
zend_proxy_object *pobj = emalloc(sizeof(zend_proxy_object));
zval *retval;
pobj->object = object;
zval_add_ref(&pobj->object);
ALLOC_ZVAL(pobj->property);
INIT_PZVAL_COPY(pobj->property, member);
zval_copy_ctor(pobj->property);
MAKE_STD_ZVAL(retval);
Z_TYPE_P(retval) = IS_OBJECT;
Z_OBJ_HANDLE_P(retval) = zend_objects_store_put(pobj, (zend_objects_store_dtor_t)zend_objects_proxy_destroy, (zend_objects_free_object_storage_t) zend_objects_proxy_free_storage, (zend_objects_store_clone_t) zend_objects_proxy_clone TSRMLS_CC);
Z_OBJ_HT_P(retval) = &zend_object_proxy_handlers;
return retval;
}
ZEND_API void zend_object_proxy_set(zval **property, zval *value TSRMLS_DC)
{
zend_proxy_object *probj = zend_object_store_get_object(*property TSRMLS_CC);
if (Z_OBJ_HT_P(probj->object) && Z_OBJ_HT_P(probj->object)->write_property) {
Z_OBJ_HT_P(probj->object)->write_property(probj->object, probj->property, value, 0 TSRMLS_CC);
} else {
zend_error(E_WARNING, "Cannot write property of object - no write handler defined");
}
}
ZEND_API zval* zend_object_proxy_get(zval *property TSRMLS_DC)
{
zend_proxy_object *probj = zend_object_store_get_object(property TSRMLS_CC);
if (Z_OBJ_HT_P(probj->object) && Z_OBJ_HT_P(probj->object)->read_property) {
return Z_OBJ_HT_P(probj->object)->read_property(probj->object, probj->property, BP_VAR_R, 0 TSRMLS_CC);
} else {
zend_error(E_WARNING, "Cannot read property of object - no read handler defined");
}
return NULL;
}
ZEND_API zend_object_handlers *zend_get_std_object_handlers(void)
{
return &std_object_handlers;
}
static zend_object_handlers zend_object_proxy_handlers = {
ZEND_OBJECTS_STORE_HANDLERS,
NULL, /* read_property */
NULL, /* write_property */
NULL, /* read dimension */
NULL, /* write_dimension */
NULL, /* get_property_ptr_ptr */
zend_object_proxy_get, /* get */
zend_object_proxy_set, /* set */
NULL, /* has_property */
NULL, /* unset_property */
NULL, /* has_dimension */
NULL, /* unset_dimension */
NULL, /* get_properties */
NULL, /* get_method */
NULL, /* call_method */
NULL, /* get_constructor */
NULL, /* get_class_entry */
NULL, /* get_class_name */
NULL, /* compare_objects */
NULL, /* cast_object */
NULL, /* count_elements */
};
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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