1 files changed, 117 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/API/JSManagedValue.mm b/Source/JavaScriptCore/API/JSManagedValue.mm
new file mode 100644
index 000000000..f336ba662
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+++ b/Source/JavaScriptCore/API/JSManagedValue.mm
@@ -0,0 +1,117 @@
+/*
+ * 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