Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285)

1 files changed, 569 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/API/JSCallbackObjectFunctions.h b/Source/JavaScriptCore/API/JSCallbackObjectFunctions.h
new file mode 100644
index 000000000..cab5883da
--- /dev/null
+++ b/Source/JavaScriptCore/API/JSCallbackObjectFunctions.h
@@ -0,0 +1,569 @@
+/*
+ * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
+ *
+ * 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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. 
+ */
+
+#include "APIShims.h"
+#include "APICast.h"
+#include "Error.h"
+#include "ExceptionHelpers.h"
+#include "JSCallbackFunction.h"
+#include "JSClassRef.h"
+#include "JSFunction.h"
+#include "JSGlobalObject.h"
+#include "JSLock.h"
+#include "JSObjectRef.h"
+#include "JSString.h"
+#include "JSStringRef.h"
+#include "OpaqueJSString.h"
+#include "PropertyNameArray.h"
+#include <wtf/Vector.h>
+
+namespace JSC {
+
+template <class Parent>
+inline JSCallbackObject<Parent>* JSCallbackObject<Parent>::asCallbackObject(JSValue value)
+{
+    ASSERT(asObject(value)->inherits(&s_info));
+    return static_cast<JSCallbackObject*>(asObject(value));
+}
+
+template <class Parent>
+JSCallbackObject<Parent>::JSCallbackObject(ExecState* exec, Structure* structure, JSClassRef jsClass, void* data)
+    : Parent(exec->globalData(), structure)
+    , m_callbackObjectData(adoptPtr(new JSCallbackObjectData(data, jsClass)))
+{
+}
+
+// Global object constructor.
+// FIXME: Move this into a separate JSGlobalCallbackObject class derived from this one.
+template <class Parent>
+JSCallbackObject<Parent>::JSCallbackObject(JSGlobalData& globalData, JSClassRef jsClass, Structure* structure)
+    : Parent(globalData, structure)
+    , m_callbackObjectData(adoptPtr(new JSCallbackObjectData(0, jsClass)))
+{
+}
+
+template <class Parent>
+void JSCallbackObject<Parent>::finishCreation(ExecState* exec)
+{
+    Base::finishCreation(exec->globalData());
+    ASSERT(Parent::inherits(&s_info));
+    init(exec);
+}
+
+// This is just for Global object, so we can assume that Base::finishCreation is JSGlobalObject::finishCreation.
+template <class Parent>
+void JSCallbackObject<Parent>::finishCreation(JSGlobalData& globalData)
+{
+    ASSERT(Parent::inherits(&s_info));
+    ASSERT(Parent::isGlobalObject());
+    Base::finishCreation(globalData);
+    init(static_cast<JSGlobalObject*>(this)->globalExec());
+}
+
+template <class Parent>
+void JSCallbackObject<Parent>::init(ExecState* exec)
+{
+    ASSERT(exec);
+    
+    Vector<JSObjectInitializeCallback, 16> initRoutines;
+    JSClassRef jsClass = classRef();
+    do {
+        if (JSObjectInitializeCallback initialize = jsClass->initialize)
+            initRoutines.append(initialize);
+    } while ((jsClass = jsClass->parentClass));
+    
+    // initialize from base to derived
+    for (int i = static_cast<int>(initRoutines.size()) - 1; i >= 0; i--) {
+        APICallbackShim callbackShim(exec);
+        JSObjectInitializeCallback initialize = initRoutines[i];
+        initialize(toRef(exec), toRef(this));
+    }
+
+    bool needsFinalizer = false;
+    for (JSClassRef jsClassPtr = classRef(); jsClassPtr && !needsFinalizer; jsClassPtr = jsClassPtr->parentClass)
+        needsFinalizer = jsClassPtr->finalize;
+    if (needsFinalizer) {
+        HandleSlot slot = exec->globalData().heap.handleHeap()->allocate();
+        HandleHeap::heapFor(slot)->makeWeak(slot, m_callbackObjectData.get(), classRef());
+        HandleHeap::heapFor(slot)->writeBarrier(slot, this);
+        *slot = this;
+    }
+}
+
+template <class Parent>
+UString JSCallbackObject<Parent>::className(const JSObject* object)
+{
+    const JSCallbackObject* thisObject = jsCast<const JSCallbackObject*>(object);
+    UString thisClassName = thisObject->classRef()->className();
+    if (!thisClassName.isEmpty())
+        return thisClassName;
+    
+    return Parent::className(object);
+}
+
+template <class Parent>
+bool JSCallbackObject<Parent>::getOwnPropertySlot(JSCell* cell, ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
+    JSContextRef ctx = toRef(exec);
+    JSObjectRef thisRef = toRef(thisObject);
+    RefPtr<OpaqueJSString> propertyNameRef;
+    
+    for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        // optional optimization to bypass getProperty in cases when we only need to know if the property exists
+        if (JSObjectHasPropertyCallback hasProperty = jsClass->hasProperty) {
+            if (!propertyNameRef)
+                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
+            APICallbackShim callbackShim(exec);
+            if (hasProperty(ctx, thisRef, propertyNameRef.get())) {
+                slot.setCustom(thisObject, callbackGetter);
+                return true;
+            }
+        } else if (JSObjectGetPropertyCallback getProperty = jsClass->getProperty) {
+            if (!propertyNameRef)
+                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
+            JSValueRef exception = 0;
+            JSValueRef value;
+            {
+                APICallbackShim callbackShim(exec);
+                value = getProperty(ctx, thisRef, propertyNameRef.get(), &exception);
+            }
+            if (exception) {
+                throwError(exec, toJS(exec, exception));
+                slot.setValue(jsUndefined());
+                return true;
+            }
+            if (value) {
+                slot.setValue(toJS(exec, value));
+                return true;
+            }
+        }
+        
+        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
+            if (staticValues->contains(propertyName.impl())) {
+                JSValue value = thisObject->getStaticValue(exec, propertyName);
+                if (value) {
+                    slot.setValue(value);
+                    return true;
+                }
+            }
+        }
+        
+        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
+            if (staticFunctions->contains(propertyName.impl())) {
+                slot.setCustom(thisObject, staticFunctionGetter);
+                return true;
+            }
+        }
+    }
+    
+    return Parent::getOwnPropertySlot(thisObject, exec, propertyName, slot);
+}
+
+template <class Parent>
+bool JSCallbackObject<Parent>::getOwnPropertyDescriptor(JSObject* object, ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(object);
+    PropertySlot slot;
+    if (thisObject->methodTable()->getOwnPropertySlot(thisObject, exec, propertyName, slot)) {
+        // Ideally we should return an access descriptor, but returning a value descriptor is better than nothing.
+        JSValue value = slot.getValue(exec, propertyName);
+        if (!exec->hadException())
+            descriptor.setValue(value);
+        // We don't know whether the property is configurable, but assume it is.
+        descriptor.setConfigurable(true);
+        // We don't know whether the property is enumerable (we could call getOwnPropertyNames() to find out), but assume it isn't.
+        descriptor.setEnumerable(false);
+        return true;
+    }
+
+    return Parent::getOwnPropertyDescriptor(thisObject, exec, propertyName, descriptor);
+}
+
+template <class Parent>
+void JSCallbackObject<Parent>::put(JSCell* cell, ExecState* exec, const Identifier& propertyName, JSValue value, PutPropertySlot& slot)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
+    JSContextRef ctx = toRef(exec);
+    JSObjectRef thisRef = toRef(thisObject);
+    RefPtr<OpaqueJSString> propertyNameRef;
+    JSValueRef valueRef = toRef(exec, value);
+    
+    for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (JSObjectSetPropertyCallback setProperty = jsClass->setProperty) {
+            if (!propertyNameRef)
+                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
+            JSValueRef exception = 0;
+            bool result;
+            {
+                APICallbackShim callbackShim(exec);
+                result = setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, &exception);
+            }
+            if (exception)
+                throwError(exec, toJS(exec, exception));
+            if (result || exception)
+                return;
+        }
+        
+        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
+            if (StaticValueEntry* entry = staticValues->get(propertyName.impl())) {
+                if (entry->attributes & kJSPropertyAttributeReadOnly)
+                    return;
+                if (JSObjectSetPropertyCallback setProperty = entry->setProperty) {
+                    if (!propertyNameRef)
+                        propertyNameRef = OpaqueJSString::create(propertyName.ustring());
+                    JSValueRef exception = 0;
+                    bool result;
+                    {
+                        APICallbackShim callbackShim(exec);
+                        result = setProperty(ctx, thisRef, propertyNameRef.get(), valueRef, &exception);
+                    }
+                    if (exception)
+                        throwError(exec, toJS(exec, exception));
+                    if (result || exception)
+                        return;
+                }
+            }
+        }
+        
+        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
+            if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
+                if (entry->attributes & kJSPropertyAttributeReadOnly)
+                    return;
+                thisObject->JSCallbackObject<Parent>::putDirect(exec->globalData(), propertyName, value); // put as override property
+                return;
+            }
+        }
+    }
+    
+    return Parent::put(thisObject, exec, propertyName, value, slot);
+}
+
+template <class Parent>
+bool JSCallbackObject<Parent>::deleteProperty(JSCell* cell, ExecState* exec, const Identifier& propertyName)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
+    JSContextRef ctx = toRef(exec);
+    JSObjectRef thisRef = toRef(thisObject);
+    RefPtr<OpaqueJSString> propertyNameRef;
+    
+    for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (JSObjectDeletePropertyCallback deleteProperty = jsClass->deleteProperty) {
+            if (!propertyNameRef)
+                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
+            JSValueRef exception = 0;
+            bool result;
+            {
+                APICallbackShim callbackShim(exec);
+                result = deleteProperty(ctx, thisRef, propertyNameRef.get(), &exception);
+            }
+            if (exception)
+                throwError(exec, toJS(exec, exception));
+            if (result || exception)
+                return true;
+        }
+        
+        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
+            if (StaticValueEntry* entry = staticValues->get(propertyName.impl())) {
+                if (entry->attributes & kJSPropertyAttributeDontDelete)
+                    return false;
+                return true;
+            }
+        }
+        
+        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
+            if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
+                if (entry->attributes & kJSPropertyAttributeDontDelete)
+                    return false;
+                return true;
+            }
+        }
+    }
+    
+    return Parent::deleteProperty(thisObject, exec, propertyName);
+}
+
+template <class Parent>
+bool JSCallbackObject<Parent>::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned propertyName)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
+    return thisObject->methodTable()->deleteProperty(thisObject, exec, Identifier::from(exec, propertyName));
+}
+
+template <class Parent>
+ConstructType JSCallbackObject<Parent>::getConstructData(JSCell* cell, ConstructData& constructData)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
+    for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (jsClass->callAsConstructor) {
+            constructData.native.function = construct;
+            return ConstructTypeHost;
+        }
+    }
+    return ConstructTypeNone;
+}
+
+template <class Parent>
+EncodedJSValue JSCallbackObject<Parent>::construct(ExecState* exec)
+{
+    JSObject* constructor = exec->callee();
+    JSContextRef execRef = toRef(exec);
+    JSObjectRef constructorRef = toRef(constructor);
+    
+    for (JSClassRef jsClass = static_cast<JSCallbackObject<Parent>*>(constructor)->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (JSObjectCallAsConstructorCallback callAsConstructor = jsClass->callAsConstructor) {
+            int argumentCount = static_cast<int>(exec->argumentCount());
+            Vector<JSValueRef, 16> arguments(argumentCount);
+            for (int i = 0; i < argumentCount; i++)
+                arguments[i] = toRef(exec, exec->argument(i));
+            JSValueRef exception = 0;
+            JSObject* result;
+            {
+                APICallbackShim callbackShim(exec);
+                result = toJS(callAsConstructor(execRef, constructorRef, argumentCount, arguments.data(), &exception));
+            }
+            if (exception)
+                throwError(exec, toJS(exec, exception));
+            return JSValue::encode(result);
+        }
+    }
+    
+    ASSERT_NOT_REACHED(); // getConstructData should prevent us from reaching here
+    return JSValue::encode(JSValue());
+}
+
+template <class Parent>
+bool JSCallbackObject<Parent>::hasInstance(JSObject* object, ExecState* exec, JSValue value, JSValue)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(object);
+    JSContextRef execRef = toRef(exec);
+    JSObjectRef thisRef = toRef(thisObject);
+    
+    for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (JSObjectHasInstanceCallback hasInstance = jsClass->hasInstance) {
+            JSValueRef valueRef = toRef(exec, value);
+            JSValueRef exception = 0;
+            bool result;
+            {
+                APICallbackShim callbackShim(exec);
+                result = hasInstance(execRef, thisRef, valueRef, &exception);
+            }
+            if (exception)
+                throwError(exec, toJS(exec, exception));
+            return result;
+        }
+    }
+    return false;
+}
+
+template <class Parent>
+CallType JSCallbackObject<Parent>::getCallData(JSCell* cell, CallData& callData)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(cell);
+    for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (jsClass->callAsFunction) {
+            callData.native.function = call;
+            return CallTypeHost;
+        }
+    }
+    return CallTypeNone;
+}
+
+template <class Parent>
+EncodedJSValue JSCallbackObject<Parent>::call(ExecState* exec)
+{
+    JSContextRef execRef = toRef(exec);
+    JSObjectRef functionRef = toRef(exec->callee());
+    JSObjectRef thisObjRef = toRef(exec->hostThisValue().toThisObject(exec));
+    
+    for (JSClassRef jsClass = static_cast<JSCallbackObject<Parent>*>(toJS(functionRef))->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (JSObjectCallAsFunctionCallback callAsFunction = jsClass->callAsFunction) {
+            int argumentCount = static_cast<int>(exec->argumentCount());
+            Vector<JSValueRef, 16> arguments(argumentCount);
+            for (int i = 0; i < argumentCount; i++)
+                arguments[i] = toRef(exec, exec->argument(i));
+            JSValueRef exception = 0;
+            JSValue result;
+            {
+                APICallbackShim callbackShim(exec);
+                result = toJS(exec, callAsFunction(execRef, functionRef, thisObjRef, argumentCount, arguments.data(), &exception));
+            }
+            if (exception)
+                throwError(exec, toJS(exec, exception));
+            return JSValue::encode(result);
+        }
+    }
+    
+    ASSERT_NOT_REACHED(); // getCallData should prevent us from reaching here
+    return JSValue::encode(JSValue());
+}
+
+template <class Parent>
+void JSCallbackObject<Parent>::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
+{
+    JSCallbackObject* thisObject = jsCast<JSCallbackObject*>(object);
+    JSContextRef execRef = toRef(exec);
+    JSObjectRef thisRef = toRef(thisObject);
+    
+    for (JSClassRef jsClass = thisObject->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (JSObjectGetPropertyNamesCallback getPropertyNames = jsClass->getPropertyNames) {
+            APICallbackShim callbackShim(exec);
+            getPropertyNames(execRef, thisRef, toRef(&propertyNames));
+        }
+        
+        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec)) {
+            typedef OpaqueJSClassStaticValuesTable::const_iterator iterator;
+            iterator end = staticValues->end();
+            for (iterator it = staticValues->begin(); it != end; ++it) {
+                StringImpl* name = it->first.get();
+                StaticValueEntry* entry = it->second.get();
+                if (entry->getProperty && (!(entry->attributes & kJSPropertyAttributeDontEnum) || (mode == IncludeDontEnumProperties)))
+                    propertyNames.add(Identifier(exec, name));
+            }
+        }
+        
+        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
+            typedef OpaqueJSClassStaticFunctionsTable::const_iterator iterator;
+            iterator end = staticFunctions->end();
+            for (iterator it = staticFunctions->begin(); it != end; ++it) {
+                StringImpl* name = it->first.get();
+                StaticFunctionEntry* entry = it->second.get();
+                if (!(entry->attributes & kJSPropertyAttributeDontEnum) || (mode == IncludeDontEnumProperties))
+                    propertyNames.add(Identifier(exec, name));
+            }
+        }
+    }
+    
+    Parent::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
+}
+
+template <class Parent>
+void JSCallbackObject<Parent>::setPrivate(void* data)
+{
+    m_callbackObjectData->privateData = data;
+}
+
+template <class Parent>
+void* JSCallbackObject<Parent>::getPrivate()
+{
+    return m_callbackObjectData->privateData;
+}
+
+template <class Parent>
+bool JSCallbackObject<Parent>::inherits(JSClassRef c) const
+{
+    for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
+        if (jsClass == c)
+            return true;
+    
+    return false;
+}
+
+template <class Parent>
+JSValue JSCallbackObject<Parent>::getStaticValue(ExecState* exec, const Identifier& propertyName)
+{
+    JSObjectRef thisRef = toRef(this);
+    RefPtr<OpaqueJSString> propertyNameRef;
+    
+    for (JSClassRef jsClass = classRef(); jsClass; jsClass = jsClass->parentClass)
+        if (OpaqueJSClassStaticValuesTable* staticValues = jsClass->staticValues(exec))
+            if (StaticValueEntry* entry = staticValues->get(propertyName.impl()))
+                if (JSObjectGetPropertyCallback getProperty = entry->getProperty) {
+                    if (!propertyNameRef)
+                        propertyNameRef = OpaqueJSString::create(propertyName.ustring());
+                    JSValueRef exception = 0;
+                    JSValueRef value;
+                    {
+                        APICallbackShim callbackShim(exec);
+                        value = getProperty(toRef(exec), thisRef, propertyNameRef.get(), &exception);
+                    }
+                    if (exception) {
+                        throwError(exec, toJS(exec, exception));
+                        return jsUndefined();
+                    }
+                    if (value)
+                        return toJS(exec, value);
+                }
+
+    return JSValue();
+}
+
+template <class Parent>
+JSValue JSCallbackObject<Parent>::staticFunctionGetter(ExecState* exec, JSValue slotParent, const Identifier& propertyName)
+{
+    JSCallbackObject* thisObj = asCallbackObject(slotParent);
+    
+    // Check for cached or override property.
+    PropertySlot slot2(thisObj);
+    if (Parent::getOwnPropertySlot(thisObj, exec, propertyName, slot2))
+        return slot2.getValue(exec, propertyName);
+    
+    for (JSClassRef jsClass = thisObj->classRef(); jsClass; jsClass = jsClass->parentClass) {
+        if (OpaqueJSClassStaticFunctionsTable* staticFunctions = jsClass->staticFunctions(exec)) {
+            if (StaticFunctionEntry* entry = staticFunctions->get(propertyName.impl())) {
+                if (JSObjectCallAsFunctionCallback callAsFunction = entry->callAsFunction) {
+                    
+                    JSObject* o = JSCallbackFunction::create(exec, thisObj->globalObject(), callAsFunction, propertyName);
+                    thisObj->putDirect(exec->globalData(), propertyName, o, entry->attributes);
+                    return o;
+                }
+            }
+        }
+    }
+    
+    return throwError(exec, createReferenceError(exec, "Static function property defined with NULL callAsFunction callback."));
+}
+
+template <class Parent>
+JSValue JSCallbackObject<Parent>::callbackGetter(ExecState* exec, JSValue slotParent, const Identifier& propertyName)
+{
+    JSCallbackObject* thisObj = asCallbackObject(slotParent);
+    
+    JSObjectRef thisRef = toRef(thisObj);
+    RefPtr<OpaqueJSString> propertyNameRef;
+    
+    for (JSClassRef jsClass = thisObj->classRef(); jsClass; jsClass = jsClass->parentClass)
+        if (JSObjectGetPropertyCallback getProperty = jsClass->getProperty) {
+            if (!propertyNameRef)
+                propertyNameRef = OpaqueJSString::create(propertyName.ustring());
+            JSValueRef exception = 0;
+            JSValueRef value;
+            {
+                APICallbackShim callbackShim(exec);
+                value = getProperty(toRef(exec), thisRef, propertyNameRef.get(), &exception);
+            }
+            if (exception) {
+                throwError(exec, toJS(exec, exception));
+                return jsUndefined();
+            }
+            if (value)
+                return toJS(exec, value);
+        }
+            
+    return throwError(exec, createReferenceError(exec, "hasProperty callback returned true for a property that doesn't exist."));
+}
+
+} // namespace JSC