forked from WebKit/WebKit
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathJSManagedValue.mm
More file actions
196 lines (165 loc) · 6.46 KB
/
JSManagedValue.mm
File metadata and controls
196 lines (165 loc) · 6.46 KB
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
/*
* Copyright (C) 2013-2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "config.h"
#import "JSManagedValue.h"
#if JSC_OBJC_API_ENABLED
#import "APICast.h"
#import "Heap.h"
#import "JSContextInternal.h"
#import "JSValueInternal.h"
#import "JSWeakValue.h"
#import "WeakHandleOwner.h"
#import "ObjcRuntimeExtras.h"
#import "JSCInlines.h"
#import <wtf/NeverDestroyed.h>
#import <wtf/RetainPtr.h>
class JSManagedValueHandleOwner final : public JSC::WeakHandleOwner {
public:
void finalize(JSC::Handle<JSC::Unknown>, void* context) final;
bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::AbstractSlotVisitor&, const char**) final;
};
static JSManagedValueHandleOwner& managedValueHandleOwner()
{
static NeverDestroyed<JSManagedValueHandleOwner> jsManagedValueHandleOwner;
return jsManagedValueHandleOwner;
}
@implementation JSManagedValue {
JSC::Weak<JSC::JSGlobalObject> m_globalObject;
RefPtr<JSC::JSLock> m_lock;
JSC::JSWeakValue m_weakValue;
RetainPtr<NSMapTable> m_owners;
}
+ (JSManagedValue *)managedValueWithValue:(JSValue *)value
{
return adoptNS([[self alloc] initWithValue:value]).autorelease();
}
+ (JSManagedValue *)managedValueWithValue:(JSValue *)value andOwner:(id)owner
{
auto managedValue = adoptNS([[self alloc] initWithValue:value]);
[value.context.virtualMachine addManagedReference:managedValue.get() withOwner:owner];
return managedValue.autorelease();
}
- (instancetype)init
{
return [self initWithValue:nil];
}
- (instancetype)initWithValue:(JSValue *)value
{
self = [super init];
if (!self)
return nil;
if (!value)
return self;
JSC::JSGlobalObject* globalObject = toJS([value.context JSGlobalContextRef]);
auto& owner = managedValueHandleOwner();
JSC::Weak<JSC::JSGlobalObject> weak(globalObject, &owner, (__bridge void*)self);
m_globalObject.swap(weak);
m_lock = &globalObject->vm().apiLock();
NSPointerFunctionsOptions weakIDOptions = NSPointerFunctionsWeakMemory | NSPointerFunctionsObjectPersonality;
NSPointerFunctionsOptions integerOptions = NSPointerFunctionsOpaqueMemory | NSPointerFunctionsIntegerPersonality;
m_owners = adoptNS([[NSMapTable alloc] initWithKeyOptions:weakIDOptions valueOptions:integerOptions capacity:1]);
JSC::JSValue jsValue = toJS(globalObject, [value JSValueRef]);
if (jsValue.isObject())
m_weakValue.setObject(JSC::jsCast<JSC::JSObject*>(jsValue.asCell()), owner, (__bridge void*)self);
else if (jsValue.isString())
m_weakValue.setString(JSC::jsCast<JSC::JSString*>(jsValue.asCell()), owner, (__bridge void*)self);
else
m_weakValue.setPrimitive(jsValue);
return self;
}
- (void)dealloc
{
JSVirtualMachine *virtualMachine = [[[self value] context] virtualMachine];
if (virtualMachine) {
auto copy = adoptNS([m_owners copy]);
for (id owner in [copy keyEnumerator]) {
size_t count = reinterpret_cast<size_t>(NSMapGet(m_owners.get(), (__bridge void*)owner));
while (count--)
[virtualMachine removeManagedReference:self withOwner:owner];
}
}
[self disconnectValue];
[super dealloc];
}
- (void)didAddOwner:(id)owner
{
size_t count = reinterpret_cast<size_t>(NSMapGet(m_owners.get(), (__bridge void*)owner));
NSMapInsert(m_owners.get(), (__bridge void*)owner, reinterpret_cast<void*>(count + 1));
}
- (void)didRemoveOwner:(id)owner
{
size_t count = reinterpret_cast<size_t>(NSMapGet(m_owners.get(), (__bridge void*)owner));
if (!count)
return;
if (count == 1) {
NSMapRemove(m_owners.get(), (__bridge void*)owner);
return;
}
NSMapInsert(m_owners.get(), (__bridge void*)owner, reinterpret_cast<void*>(count - 1));
}
- (JSValue *)value
{
WTF::Locker<JSC::JSLock> locker(m_lock.get());
JSC::VM* vm = m_lock->vm();
if (!vm)
return nil;
JSC::JSLockHolder apiLocker(vm);
if (!m_globalObject)
return nil;
if (m_weakValue.isClear())
return nil;
JSC::JSGlobalObject* globalObject = m_globalObject.get();
JSContext *context = [JSContext contextWithJSGlobalContextRef:toGlobalRef(globalObject)];
JSC::JSValue value;
if (m_weakValue.isPrimitive())
value = m_weakValue.primitive();
else if (m_weakValue.isString())
value = m_weakValue.string();
else
value = m_weakValue.object();
return [JSValue valueWithJSValueRef:toRef(globalObject, value) inContext:context];
}
- (void)disconnectValue
{
m_globalObject.clear();
m_weakValue.clear();
}
@end
@interface JSManagedValue (PrivateMethods)
- (void)disconnectValue;
@end
bool JSManagedValueHandleOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::AbstractSlotVisitor& visitor, const char** reason)
{
if (UNLIKELY(reason))
*reason = "JSManagedValue is opaque root";
JSManagedValue *managedValue = (__bridge JSManagedValue *)context;
return visitor.containsOpaqueRoot((__bridge void*)managedValue);
}
void JSManagedValueHandleOwner::finalize(JSC::Handle<JSC::Unknown>, void* context)
{
JSManagedValue *managedValue = (__bridge JSManagedValue *)context;
[managedValue disconnectValue];
}
#endif // JSC_OBJC_API_ENABLED