summaryrefslogtreecommitdiff
path: root/Zend/zend_objects_API.c
blob: 80359b5e1ebfa16b818f006bae90b9da034f1e4a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 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@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Dmitry Stogov <dmitry@php.net>                              |
   +----------------------------------------------------------------------+
*/

#include "zend.h"
#include "zend_globals.h"
#include "zend_variables.h"
#include "zend_API.h"
#include "zend_objects_API.h"

ZEND_API void ZEND_FASTCALL zend_objects_store_init(zend_objects_store *objects, uint32_t init_size)
{
	objects->object_buckets = (zend_object **) emalloc(init_size * sizeof(zend_object*));
	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*));
}

ZEND_API void ZEND_FASTCALL zend_objects_store_destroy(zend_objects_store *objects)
{
	efree(objects->object_buckets);
	objects->object_buckets = NULL;
}

ZEND_API void ZEND_FASTCALL zend_objects_store_call_destructors(zend_objects_store *objects)
{
	EG(flags) |= EG_FLAGS_OBJECT_STORE_NO_REUSE;
	if (objects->top > 1) {
		uint32_t i;
		for (i = 1; i < objects->top; i++) {
			zend_object *obj = objects->object_buckets[i];
			if (IS_OBJ_VALID(obj)) {
				if (!(OBJ_FLAGS(obj) & IS_OBJ_DESTRUCTOR_CALLED)) {
					GC_ADD_FLAGS(obj, IS_OBJ_DESTRUCTOR_CALLED);

					if (obj->handlers->dtor_obj != zend_objects_destroy_object
							|| obj->ce->destructor) {
						GC_ADDREF(obj);
						obj->handlers->dtor_obj(obj);
						GC_DELREF(obj);
					}
				}
			}
		}
	}
}

ZEND_API void ZEND_FASTCALL zend_objects_store_mark_destructed(zend_objects_store *objects)
{
	if (objects->object_buckets && objects->top > 1) {
		zend_object **obj_ptr = objects->object_buckets + 1;
		zend_object **end = objects->object_buckets + objects->top;

		do {
			zend_object *obj = *obj_ptr;

			if (IS_OBJ_VALID(obj)) {
				GC_ADD_FLAGS(obj, IS_OBJ_DESTRUCTOR_CALLED);
			}
			obj_ptr++;
		} while (obj_ptr != end);
	}
}

ZEND_API void ZEND_FASTCALL zend_objects_store_free_object_storage(zend_objects_store *objects, zend_bool fast_shutdown)
{
	zend_object **obj_ptr, **end, *obj;

	if (objects->top <= 1) {
		return;
	}

	/* Free object contents, but don't free objects themselves, so they show up as leaks.
	 * Also add a ref to all objects, so the object can't be freed by something else later. */
	end = objects->object_buckets + 1;
	obj_ptr = objects->object_buckets + objects->top;

	if (fast_shutdown) {
		do {
			obj_ptr--;
			obj = *obj_ptr;
			if (IS_OBJ_VALID(obj)) {
				if (!(OBJ_FLAGS(obj) & IS_OBJ_FREE_CALLED)) {
					GC_ADD_FLAGS(obj, IS_OBJ_FREE_CALLED);
					if (obj->handlers->free_obj != zend_object_std_dtor) {
						GC_ADDREF(obj);
						obj->handlers->free_obj(obj);
					}
				}
			}
		} while (obj_ptr != end);
	} else {
		do {
			obj_ptr--;
			obj = *obj_ptr;
			if (IS_OBJ_VALID(obj)) {
				if (!(OBJ_FLAGS(obj) & IS_OBJ_FREE_CALLED)) {
					GC_ADD_FLAGS(obj, IS_OBJ_FREE_CALLED);
					GC_ADDREF(obj);
					obj->handlers->free_obj(obj);
				}
			}
		} while (obj_ptr != end);
	}
}


/* Store objects API */
static ZEND_COLD zend_never_inline void ZEND_FASTCALL zend_objects_store_put_cold(zend_object *object)
{
	int handle;
	uint32_t new_size = 2 * EG(objects_store).size;

	EG(objects_store).object_buckets = (zend_object **) erealloc(EG(objects_store).object_buckets, new_size * sizeof(zend_object*));
	/* Assign size after realloc, in case it fails */
	EG(objects_store).size = new_size;
	handle = EG(objects_store).top++;
	object->handle = handle;
	EG(objects_store).object_buckets[handle] = object;
}

ZEND_API void ZEND_FASTCALL zend_objects_store_put(zend_object *object)
{
	int handle;

	/* When in shutdown sequence - do not reuse previously freed handles, to make sure
	 * the dtors for newly created objects are called in zend_objects_store_call_destructors() loop
	 */
	if (EG(objects_store).free_list_head != -1 && EXPECTED(!(EG(flags) & EG_FLAGS_OBJECT_STORE_NO_REUSE))) {
		handle = EG(objects_store).free_list_head;
		EG(objects_store).free_list_head = GET_OBJ_BUCKET_NUMBER(EG(objects_store).object_buckets[handle]);
	} else if (UNEXPECTED(EG(objects_store).top == EG(objects_store).size)) {
		zend_objects_store_put_cold(object);
		return;
	} else {
		handle = EG(objects_store).top++;
	}
	object->handle = handle;
	EG(objects_store).object_buckets[handle] = object;
}

ZEND_API void ZEND_FASTCALL zend_objects_store_del(zend_object *object) /* {{{ */
{
	ZEND_ASSERT(GC_REFCOUNT(object) == 0);

	/* GC might have released this object already. */
	if (UNEXPECTED(GC_TYPE(object) == IS_NULL)) {
		return;
	}

	/*	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 (!(OBJ_FLAGS(object) & IS_OBJ_DESTRUCTOR_CALLED)) {
		GC_ADD_FLAGS(object, IS_OBJ_DESTRUCTOR_CALLED);

		if (object->handlers->dtor_obj != zend_objects_destroy_object
				|| object->ce->destructor) {
			GC_SET_REFCOUNT(object, 1);
			object->handlers->dtor_obj(object);
			GC_DELREF(object);
		}
	}

	if (GC_REFCOUNT(object) == 0) {
		uint32_t handle = object->handle;
		void *ptr;

		ZEND_ASSERT(EG(objects_store).object_buckets != NULL);
		ZEND_ASSERT(IS_OBJ_VALID(EG(objects_store).object_buckets[handle]));
		EG(objects_store).object_buckets[handle] = SET_OBJ_INVALID(object);
		if (!(OBJ_FLAGS(object) & IS_OBJ_FREE_CALLED)) {
			GC_ADD_FLAGS(object, IS_OBJ_FREE_CALLED);
			GC_SET_REFCOUNT(object, 1);
			object->handlers->free_obj(object);
		}
		ptr = ((char*)object) - object->handlers->offset;
		GC_REMOVE_FROM_BUFFER(object);
		efree(ptr);
		ZEND_OBJECTS_STORE_ADD_TO_FREE_LIST(handle);
	}
}
/* }}} */