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/*
* Copyright (C) 2013 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 "JSCJSValueInlines.h"
#import "JSContextInternal.h"
#import "JSValueInternal.h"
#import "Weak.h"
#import "WeakHandleOwner.h"
#import "ObjcRuntimeExtras.h"
class JSManagedValueHandleOwner : public JSC::WeakHandleOwner {
public:
virtual void finalize(JSC::Handle<JSC::Unknown>, void* context);
virtual bool isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::SlotVisitor&);
};
static JSManagedValueHandleOwner* managedValueHandleOwner()
{
DEFINE_STATIC_LOCAL(JSManagedValueHandleOwner, jsManagedValueHandleOwner, ());
return &jsManagedValueHandleOwner;
}
@implementation JSManagedValue {
JSC::Weak<JSC::JSObject> m_value;
}
+ (JSManagedValue *)managedValueWithValue:(JSValue *)value
{
return [[[self alloc] initWithValue:value] autorelease];
}
- (id)init
{
return [self initWithValue:nil];
}
- (id)initWithValue:(JSValue *)value
{
self = [super init];
if (!self)
return nil;
if (!value || !JSValueIsObject([value.context JSGlobalContextRef], [value JSValueRef])) {
JSC::Weak<JSC::JSObject> weak;
m_value.swap(weak);
} else {
JSC::JSObject* object = toJS(const_cast<OpaqueJSValue*>([value JSValueRef]));
JSC::Weak<JSC::JSObject> weak(object, managedValueHandleOwner(), self);
m_value.swap(weak);
}
return self;
}
- (JSValue *)value
{
if (!m_value)
return nil;
JSC::JSObject* object = m_value.get();
JSContext *context = [JSContext contextWithJSGlobalContextRef:toGlobalRef(object->structure()->globalObject()->globalExec())];
return [JSValue valueWithJSValueRef:toRef(object) inContext:context];
}
- (void)disconnectValue
{
m_value.clear();
}
@end
@interface JSManagedValue (PrivateMethods)
- (void)disconnectValue;
@end
bool JSManagedValueHandleOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown>, void* context, JSC::SlotVisitor& visitor)
{
JSManagedValue *managedValue = static_cast<JSManagedValue *>(context);
return visitor.containsOpaqueRoot(managedValue);
}
void JSManagedValueHandleOwner::finalize(JSC::Handle<JSC::Unknown>, void* context)
{
JSManagedValue *managedValue = static_cast<JSManagedValue *>(context);
[managedValue disconnectValue];
}
#endif // JSC_OBJC_API_ENABLED
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