自学教程：C++ toJS函数代码示例

RefPtr<InjectedBundleNodeHandle> InjectedBundleNodeHandle::getOrCreate(JSContextRef, JSObjectRef object){    Node* node = JSNode::toWrapped(toJS(object));    return getOrCreate(node);}

JSValue* JSSVGFEFloodElement::getValueProperty(ExecState* exec, int token) const{    switch (token) {    case In1AttrNum: {        SVGFEFloodElement* imp = static_cast<SVGFEFloodElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedString> obj = imp->in1Animated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedString>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedString>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedString>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case XAttrNum: {        SVGFEFloodElement* imp = static_cast<SVGFEFloodElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->xAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case YAttrNum: {        SVGFEFloodElement* imp = static_cast<SVGFEFloodElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->yAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case WidthAttrNum: {        SVGFEFloodElement* imp = static_cast<SVGFEFloodElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->widthAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case HeightAttrNum: {        SVGFEFloodElement* imp = static_cast<SVGFEFloodElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->heightAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case ResultAttrNum: {        SVGFEFloodElement* imp = static_cast<SVGFEFloodElement*>(impl());//.........这里部分代码省略.........

EncodedJSValue JSNodeList::indexGetter(ExecState* exec, EncodedJSValue slotBase, EncodedJSValue, unsigned index){    JSNodeList* thisObj = jsCast<JSNodeList*>(JSValue::decode(slotBase));    ASSERT_GC_OBJECT_INHERITS(thisObj, info());    return JSValue::encode(toJS(exec, thisObj->globalObject(), thisObj->impl().item(index)));}

JSValue JSNamedNodeMap::nameGetter(ExecState* exec, const Identifier& propertyName, const PropertySlot& slot){    JSNamedNodeMap* thisObj = static_cast<JSNamedNodeMap*>(asObject(slot.slotBase()));    return toJS(exec, thisObj->impl()->getNamedItem(propertyName));}

JSValue* JSNodeList::nameGetter(ExecState* exec, const Identifier& propertyName, const PropertySlot& slot){    JSNodeList* thisObj = static_cast<JSNodeList*>(slot.slotBase());    return toJS(exec, thisObj->impl()->itemWithName(propertyName));}

void JSDOMWindowBase::updateDocument(){    ASSERT(m_impl->document());    ExecState* exec = globalExec();    symbolTablePutWithAttributes(exec->globalData(), Identifier(exec, "document"), toJS(exec, this, m_impl->document()), DontDelete | ReadOnly);}

JSValue* JSSVGTransformListPrototypeFunction::callAsFunction(ExecState* exec, JSObject* thisObj, const List& args){    if (!thisObj->inherits(&JSSVGTransformList::info))      return throwError(exec, TypeError);    SVGTransformList* imp = static_cast<SVGTransformList*>(static_cast<JSSVGTransformList*>(thisObj)->impl());    switch (id) {    case JSSVGTransformList::ClearFuncNum: {        ExceptionCode ec = 0;        imp->clear(ec);        setDOMException(exec, ec);        return jsUndefined();    }    case JSSVGTransformList::InitializeFuncNum: {        ExceptionCode ec = 0;        SVGTransform item = toSVGTransform(args[0]);        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<SVGTransform>(imp->initialize(item, ec)));        setDOMException(exec, ec);        return result;    }    case JSSVGTransformList::GetItemFuncNum: {        ExceptionCode ec = 0;        bool indexOk;        unsigned index = args[0]->toInt32(exec, indexOk);        if (!indexOk) {            setDOMException(exec, TYPE_MISMATCH_ERR);            return jsUndefined();        }        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<SVGTransform>(imp->getItem(index, ec)));        setDOMException(exec, ec);        return result;    }    case JSSVGTransformList::InsertItemBeforeFuncNum: {        ExceptionCode ec = 0;        SVGTransform item = toSVGTransform(args[0]);        bool indexOk;        unsigned index = args[1]->toInt32(exec, indexOk);        if (!indexOk) {            setDOMException(exec, TYPE_MISMATCH_ERR);            return jsUndefined();        }        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<SVGTransform>(imp->insertItemBefore(item, index, ec)));        setDOMException(exec, ec);        return result;    }    case JSSVGTransformList::ReplaceItemFuncNum: {        ExceptionCode ec = 0;        SVGTransform item = toSVGTransform(args[0]);        bool indexOk;        unsigned index = args[1]->toInt32(exec, indexOk);        if (!indexOk) {            setDOMException(exec, TYPE_MISMATCH_ERR);            return jsUndefined();        }        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<SVGTransform>(imp->replaceItem(item, index, ec)));        setDOMException(exec, ec);        return result;    }    case JSSVGTransformList::RemoveItemFuncNum: {        ExceptionCode ec = 0;        bool indexOk;        unsigned index = args[0]->toInt32(exec, indexOk);        if (!indexOk) {            setDOMException(exec, TYPE_MISMATCH_ERR);            return jsUndefined();        }        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<SVGTransform>(imp->removeItem(index, ec)));        setDOMException(exec, ec);        return result;    }    case JSSVGTransformList::AppendItemFuncNum: {        ExceptionCode ec = 0;        SVGTransform item = toSVGTransform(args[0]);        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<SVGTransform>(imp->appendItem(item, ec)));        setDOMException(exec, ec);        return result;    }    case JSSVGTransformList::CreateSVGTransformFromMatrixFuncNum: {        AffineTransform matrix = toSVGMatrix(args[0]);        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<SVGTransform>(imp->createSVGTransformFromMatrix(matrix)));        return result;    }    case JSSVGTransformList::ConsolidateFuncNum: {//.........这里部分代码省略.........

JSValue* JSSVGFilterElement::getValueProperty(ExecState* exec, int token) const{    switch (token) {    case FilterUnitsAttrNum: {        SVGFilterElement* imp = static_cast<SVGFilterElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedEnumeration> obj = imp->filterUnitsAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedEnumeration>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedEnumeration>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedEnumeration>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case PrimitiveUnitsAttrNum: {        SVGFilterElement* imp = static_cast<SVGFilterElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedEnumeration> obj = imp->primitiveUnitsAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedEnumeration>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedEnumeration>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedEnumeration>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case XAttrNum: {        SVGFilterElement* imp = static_cast<SVGFilterElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->xAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case YAttrNum: {        SVGFilterElement* imp = static_cast<SVGFilterElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->yAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case WidthAttrNum: {        SVGFilterElement* imp = static_cast<SVGFilterElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->widthAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case HeightAttrNum: {        SVGFilterElement* imp = static_cast<SVGFilterElement*>(impl());//.........这里部分代码省略.........

JSValue* JSSVGPathElementPrototypeFunction::callAsFunction(ExecState* exec, JSObject* thisObj, const List& args){    if (!thisObj->inherits(&JSSVGPathElement::info))      return throwError(exec, TypeError);    SVGPathElement* imp = static_cast<SVGPathElement*>(static_cast<JSSVGPathElement*>(thisObj)->impl());    switch (id) {    case JSSVGPathElement::GetTotalLengthFuncNum: {        KJS::JSValue* result = jsNumber(imp->getTotalLength());        return result;    }    case JSSVGPathElement::GetPointAtLengthFuncNum: {        float distance = args[0]->toFloat(exec);        KJS::JSValue* result = toJS(exec, new JSSVGPODTypeWrapper<FloatPoint>(imp->getPointAtLength(distance)));        return result;    }    case JSSVGPathElement::GetPathSegAtLengthFuncNum: {        float distance = args[0]->toFloat(exec);        KJS::JSValue* result = jsNumber(imp->getPathSegAtLength(distance));        return result;    }    case JSSVGPathElement::CreateSVGPathSegClosePathFuncNum: {        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegClosePath()));        return result;    }    case JSSVGPathElement::CreateSVGPathSegMovetoAbsFuncNum: {        float x = args[0]->toFloat(exec);        float y = args[1]->toFloat(exec);        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegMovetoAbs(x, y)));        return result;    }    case JSSVGPathElement::CreateSVGPathSegMovetoRelFuncNum: {        float x = args[0]->toFloat(exec);        float y = args[1]->toFloat(exec);        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegMovetoRel(x, y)));        return result;    }    case JSSVGPathElement::CreateSVGPathSegLinetoAbsFuncNum: {        float x = args[0]->toFloat(exec);        float y = args[1]->toFloat(exec);        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegLinetoAbs(x, y)));        return result;    }    case JSSVGPathElement::CreateSVGPathSegLinetoRelFuncNum: {        float x = args[0]->toFloat(exec);        float y = args[1]->toFloat(exec);        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegLinetoRel(x, y)));        return result;    }    case JSSVGPathElement::CreateSVGPathSegCurvetoCubicAbsFuncNum: {        float x = args[0]->toFloat(exec);        float y = args[1]->toFloat(exec);        float x1 = args[2]->toFloat(exec);        float y1 = args[3]->toFloat(exec);        float x2 = args[4]->toFloat(exec);        float y2 = args[5]->toFloat(exec);        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegCurvetoCubicAbs(x, y, x1, y1, x2, y2)));        return result;    }    case JSSVGPathElement::CreateSVGPathSegCurvetoCubicRelFuncNum: {        float x = args[0]->toFloat(exec);        float y = args[1]->toFloat(exec);        float x1 = args[2]->toFloat(exec);        float y1 = args[3]->toFloat(exec);        float x2 = args[4]->toFloat(exec);        float y2 = args[5]->toFloat(exec);        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegCurvetoCubicRel(x, y, x1, y1, x2, y2)));        return result;    }    case JSSVGPathElement::CreateSVGPathSegCurvetoQuadraticAbsFuncNum: {        float x = args[0]->toFloat(exec);        float y = args[1]->toFloat(exec);        float x1 = args[2]->toFloat(exec);        float y1 = args[3]->toFloat(exec);        KJS::JSValue* result = toJS(exec, WTF::getPtr(imp->createSVGPathSegCurvetoQuadraticAbs(x, y, x1, y1)));        return result;    }//.........这里部分代码省略.........

void JSDOMWindowBase::updateDocument(){    ASSERT(m_impl->document());    ExecState* exec = globalExec();    symbolTablePutWithAttributes(this, exec->vm(), exec->vm().propertyNames->document, toJS(exec, this, m_impl->document()), DontDelete | ReadOnly);}

KJS::JSValue* JSNodeList::nameGetter(KJS::ExecState* exec, KJS::JSObject* originalObject, const KJS::Identifier& propertyName, const KJS::PropertySlot& slot){    JSNodeList* thisObj = static_cast<JSNodeList*>(slot.slotBase());    return toJS(exec, thisObj->impl()->itemWithName(propertyName));}

JSValue jsHTMLIFrameElementContentDocument(ExecState* exec, JSValue slotBase, const Identifier&){    JSHTMLIFrameElement* castedThis = static_cast<JSHTMLIFrameElement*>(asObject(slotBase));    HTMLIFrameElement* imp = static_cast<HTMLIFrameElement*>(castedThis->impl());    return checkNodeSecurity(exec, imp->contentDocument()) ? toJS(exec, castedThis->globalObject(), WTF::getPtr(imp->contentDocument())) : jsUndefined();}

static JSValue toJS(ExecState* exec, JSDOMGlobalObject* globalObject, WebGLExtension* extension){    if (!extension)        return jsNull();    switch (extension->getName()) {    case WebGLExtension::WebGLLoseContextName:        return toJS(exec, globalObject, static_cast<WebGLLoseContext*>(extension));    case WebGLExtension::EXTDrawBuffersName:        return toJS(exec, globalObject, static_cast<EXTDrawBuffers*>(extension));    case WebGLExtension::EXTTextureFilterAnisotropicName:        return toJS(exec, globalObject, static_cast<EXTTextureFilterAnisotropic*>(extension));    case WebGLExtension::OESStandardDerivativesName:        return toJS(exec, globalObject, static_cast<OESStandardDerivatives*>(extension));    case WebGLExtension::OESTextureFloatName:        return toJS(exec, globalObject, static_cast<OESTextureFloat*>(extension));    case WebGLExtension::OESTextureHalfFloatName:        return toJS(exec, globalObject, static_cast<OESTextureHalfFloat*>(extension));    case WebGLExtension::OESVertexArrayObjectName:        return toJS(exec, globalObject, static_cast<OESVertexArrayObject*>(extension));    case WebGLExtension::OESElementIndexUintName:        return toJS(exec, globalObject, static_cast<OESElementIndexUint*>(extension));    case WebGLExtension::WebGLDebugRendererInfoName:        return toJS(exec, globalObject, static_cast<WebGLDebugRendererInfo*>(extension));    case WebGLExtension::WebGLDebugShadersName:        return toJS(exec, globalObject, static_cast<WebGLDebugShaders*>(extension));    case WebGLExtension::WebGLCompressedTextureATCName:        return toJS(exec, globalObject, static_cast<WebGLCompressedTextureATC*>(extension));    case WebGLExtension::WebGLCompressedTextureS3TCName:        return toJS(exec, globalObject, static_cast<WebGLCompressedTextureS3TC*>(extension));    case WebGLExtension::WebGLDepthTextureName:        return toJS(exec, globalObject, static_cast<WebGLDepthTexture*>(extension));    }    ASSERT_NOT_REACHED();    return jsNull();}

JSObject* JSLazyEventListener::initializeJSFunction(ScriptExecutionContext* executionContext) const{    ASSERT(is<Document>(executionContext));    if (!executionContext)        return nullptr;    ASSERT(!m_code.isNull());    ASSERT(!m_eventParameterName.isNull());    if (m_code.isNull() || m_eventParameterName.isNull())        return nullptr;    Document& document = downcast<Document>(*executionContext);    if (!document.frame())        return nullptr;    if (!document.contentSecurityPolicy()->allowInlineEventHandlers(m_sourceURL, m_sourcePosition.m_line))        return nullptr;    ScriptController& script = document.frame()->script();    if (!script.canExecuteScripts(AboutToExecuteScript) || script.isPaused())        return nullptr;    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(executionContext, isolatedWorld());    if (!globalObject)        return nullptr;    VM& vm = globalObject->vm();    JSLockHolder lock(vm);    auto scope = DECLARE_CATCH_SCOPE(vm);    ExecState* exec = globalObject->globalExec();    MarkedArgumentBuffer args;    args.append(jsNontrivialString(exec, m_eventParameterName));    args.append(jsStringWithCache(exec, m_code));    // We want all errors to refer back to the line on which our attribute was    // declared, regardless of any newlines in our JavaScript source text.    int overrideLineNumber = m_sourcePosition.m_line.oneBasedInt();    JSObject* jsFunction = constructFunctionSkippingEvalEnabledCheck(        exec, exec->lexicalGlobalObject(), args, Identifier::fromString(exec, m_functionName),        m_sourceURL, m_sourcePosition, overrideLineNumber);    if (UNLIKELY(scope.exception())) {        reportCurrentException(exec);        scope.clearException();        return nullptr;    }    JSFunction* listenerAsFunction = jsCast<JSFunction*>(jsFunction);    if (m_originalNode) {        if (!wrapper()) {            // Ensure that 'node' has a JavaScript wrapper to mark the event listener we're creating.            // FIXME: Should pass the global object associated with the node            setWrapper(vm, asObject(toJS(exec, globalObject, *m_originalNode)));        }        // Add the event's home element to the scope        // (and the document, and the form - see JSHTMLElement::eventHandlerScope)        listenerAsFunction->setScope(vm, jsCast<JSNode*>(wrapper())->pushEventHandlerScope(exec, listenerAsFunction->scope()));    }    return jsFunction;}

JSValue JSHTMLCollection::indexGetter(ExecState* exec, JSValue slotBase, unsigned index){    JSHTMLCollection* thisObj = static_cast<JSHTMLCollection*>(asObject(slotBase));    ASSERT_GC_OBJECT_INHERITS(thisObj, &s_info);    return toJS(exec, thisObj->globalObject(), static_cast<HTMLCollection*>(thisObj->impl())->item(index));}

JSValue toJS(ExecState* exec, JSDOMGlobalObject*, WorkerGlobalScope* workerGlobalScope){    return toJS(exec, workerGlobalScope);}

// JSDOMGlobalObject* is ignored, accessing a window in any context will// use that DOMWindow's prototype chain.JSValue toJS(ExecState* exec, JSDOMGlobalObject*, DOMWindow* domWindow){    return toJS(exec, domWindow);}

void JSEventListener::handleEvent(ScriptExecutionContext* scriptExecutionContext, Event* event){    ASSERT(scriptExecutionContext);    if (!scriptExecutionContext || scriptExecutionContext->isJSExecutionForbidden())        return;    VM& vm = scriptExecutionContext->vm();    JSLockHolder lock(vm);    auto scope = DECLARE_CATCH_SCOPE(vm);    // See https://dom.spec.whatwg.org/#dispatching-events spec on calling handleEvent.    // "If this throws an exception, report the exception." It should not propagate the    // exception.    JSObject* jsFunction = this->jsFunction(scriptExecutionContext);    if (!jsFunction)        return;    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(scriptExecutionContext, *m_isolatedWorld);    if (!globalObject)        return;    if (scriptExecutionContext->isDocument()) {        JSDOMWindow* window = jsCast<JSDOMWindow*>(globalObject);        if (!window->wrapped().isCurrentlyDisplayedInFrame())            return;        if (wasCreatedFromMarkup() && !scriptExecutionContext->contentSecurityPolicy()->allowInlineEventHandlers(sourceURL(), sourcePosition().m_line))            return;        // FIXME: Is this check needed for other contexts?        ScriptController& script = window->wrapped().frame()->script();        if (!script.canExecuteScripts(AboutToExecuteScript) || script.isPaused())            return;    }    ExecState* exec = globalObject->globalExec();    JSValue handleEventFunction = jsFunction;    CallData callData;    CallType callType = getCallData(handleEventFunction, callData);    // If jsFunction is not actually a function, see if it implements the EventListener interface and use that    if (callType == CallType::None) {        handleEventFunction = jsFunction->get(exec, Identifier::fromString(exec, "handleEvent"));        if (UNLIKELY(scope.exception())) {            auto* exception = scope.exception();            scope.clearException();            event->target()->uncaughtExceptionInEventHandler();            reportException(exec, exception);            return;        }        callType = getCallData(handleEventFunction, callData);    }    if (callType != CallType::None) {        Ref<JSEventListener> protectedThis(*this);        MarkedArgumentBuffer args;        args.append(toJS(exec, globalObject, event));        Event* savedEvent = globalObject->currentEvent();        globalObject->setCurrentEvent(event);        VMEntryScope entryScope(vm, vm.entryScope ? vm.entryScope->globalObject() : globalObject);        InspectorInstrumentationCookie cookie = JSMainThreadExecState::instrumentFunctionCall(scriptExecutionContext, callType, callData);        JSValue thisValue = handleEventFunction == jsFunction ? toJS(exec, globalObject, event->currentTarget()) : jsFunction;        NakedPtr<JSC::Exception> exception;        JSValue retval = scriptExecutionContext->isDocument()            ? JSMainThreadExecState::profiledCall(exec, JSC::ProfilingReason::Other, handleEventFunction, callType, callData, thisValue, args, exception)            : JSC::profiledCall(exec, JSC::ProfilingReason::Other, handleEventFunction, callType, callData, thisValue, args, exception);        InspectorInstrumentation::didCallFunction(cookie, scriptExecutionContext);        globalObject->setCurrentEvent(savedEvent);        if (is<WorkerGlobalScope>(*scriptExecutionContext)) {            auto scriptController = downcast<WorkerGlobalScope>(*scriptExecutionContext).script();            bool terminatorCausedException = (scope.exception() && isTerminatedExecutionException(scope.exception()));            if (terminatorCausedException || scriptController->isTerminatingExecution())                scriptController->forbidExecution();        }        if (exception) {            event->target()->uncaughtExceptionInEventHandler();            reportException(exec, exception);        } else {            if (!retval.isUndefinedOrNull() && is<BeforeUnloadEvent>(*event))                downcast<BeforeUnloadEvent>(*event).setReturnValue(retval.toWTFString(exec));            if (m_isAttribute) {                if (retval.isFalse())                    event->preventDefault();            }        }    }}

EncodedJSValue JSC_HOST_CALL JSTestNodeConstructor::constructJSTestNode(ExecState* exec){    JSTestNodeConstructor* castedThis = jsCast<JSTestNodeConstructor*>(exec->callee());    RefPtr<TestNode> object = TestNode::create();    return JSValue::encode(asObject(toJS(exec, castedThis->globalObject(), object.get())));}

JSValue* JSSVGCircleElement::getValueProperty(ExecState* exec, int token) const{    switch (token) {    case CxAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->cxAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case CyAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->cyAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case RAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedLength> obj = imp->rAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedLength>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedLength>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedLength>(obj.get(), imp);            }        }        return toJS(exec, obj.get());    }    case RequiredFeaturesAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        return toJS(exec, WTF::getPtr(imp->requiredFeatures()));    }    case RequiredExtensionsAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        return toJS(exec, WTF::getPtr(imp->requiredExtensions()));    }    case SystemLanguageAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        return toJS(exec, WTF::getPtr(imp->systemLanguage()));    }    case XmllangAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        return jsString(imp->xmllang());    }    case XmlspaceAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        return jsString(imp->xmlspace());    }    case ExternalResourcesRequiredAttrNum: {        SVGCircleElement* imp = static_cast<SVGCircleElement*>(impl());        ASSERT(exec && exec->dynamicInterpreter());        RefPtr<SVGAnimatedBoolean> obj = imp->externalResourcesRequiredAnimated();        Frame* activeFrame = static_cast<ScriptInterpreter*>(exec->dynamicInterpreter())->frame();        if (activeFrame) {            SVGDocumentExtensions* extensions = (activeFrame->document() ? activeFrame->document()->accessSVGExtensions() : 0);            if (extensions) {                if (extensions->hasGenericContext<SVGAnimatedBoolean>(obj.get()))                    ASSERT(extensions->genericContext<SVGAnimatedBoolean>(obj.get()) == imp);                else                    extensions->setGenericContext<SVGAnimatedBoolean>(obj.get(), imp);            }//.........这里部分代码省略.........

EncodedJSValue JSC_HOST_CALL JSXMLSerializerConstructor::constructJSXMLSerializer(ExecState* exec){    return JSValue::encode(asObject(toJS(exec, static_cast<JSXMLSerializerConstructor*>(exec->callee())->globalObject(), XMLSerializer::create())));}

JSValue JSNodeList::nameGetter(ExecState* exec, JSValue slotBase, const Identifier& propertyName){    JSNodeList* thisObj = static_cast<JSNodeList*>(asObject(slotBase));    return toJS(exec, thisObj->impl()->itemWithName(identifierToAtomicString(propertyName)));}

JSValue toJS(ExecState* exec, JSDOMGlobalObject*, WorkerContext* workerContext){    return toJS(exec, workerContext);}

JSValue* JSEvent::clipboardData(ExecState* exec) const{    return impl()->isClipboardEvent() ? toJS(exec, impl()->clipboardData()) : jsUndefined();}

ScriptValue InjectedScriptHost::nodeAsScriptValue(ScriptState* state, Node* node){    JSLock lock(SilenceAssertionsOnly);    return ScriptValue(state->globalData(), toJS(state, deprecatedGlobalObjectForPrototype(state), node));}

JSValue JSHTMLOptionsCollection::remove(ExecState* exec){    HTMLOptionsCollection* imp = static_cast<HTMLOptionsCollection*>(impl());    JSHTMLSelectElement* base = jsCast<JSHTMLSelectElement*>(asObject(toJS(exec, globalObject(), imp->ownerNode())));    return base->remove(exec);}