C++ JSBoundFunction类代码示例

EncodedJSValue JSC_HOST_CALL hasInstanceBoundFunction(ExecState* exec)
{
    JSBoundFunction* boundObject = jsCast<JSBoundFunction*>(exec->uncheckedArgument(0));
    JSValue value = exec->uncheckedArgument(1);

    return JSValue::encode(jsBoolean(boundObject->targetFunction()->hasInstance(exec, value)));
}

JSBoundFunction* JSBoundFunction::create(ExecState* exec, JSGlobalObject* globalObject, JSObject* targetFunction, JSValue boundThis, JSValue boundArgs, int length, const String& name)
{
    ConstructData constructData;
    ConstructType constructType = JSC::getConstructData(targetFunction, constructData);
    bool canConstruct = constructType != ConstructTypeNone;
    NativeExecutable* executable = exec->vm().getHostFunction(boundFunctionCall, canConstruct ? boundFunctionConstruct : callHostFunctionAsConstructor);
    JSBoundFunction* function = new (NotNull, allocateCell<JSBoundFunction>(*exec->heap())) JSBoundFunction(exec, globalObject, globalObject->boundFunctionStructure(), targetFunction, boundThis, boundArgs);

    function->finishCreation(exec, executable, length, name);
    return function;
}

void JSBoundFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    JSBoundFunction* thisObject = jsCast<JSBoundFunction*>(cell);
    ASSERT_GC_OBJECT_INHERITS(thisObject, &s_info);
    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
    ASSERT(thisObject->structure()->typeInfo().overridesVisitChildren());
    Base::visitChildren(thisObject, visitor);

    visitor.append(&thisObject->m_targetFunction);
    visitor.append(&thisObject->m_boundThis);
    visitor.append(&thisObject->m_boundArgs);
}

EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionConstruct(ExecState* exec)
{
    JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());

    MarkedArgumentBuffer args;
    for (unsigned i = 0; i < exec->argumentCount(); ++i)
        args.append(exec->uncheckedArgument(i));

    JSFunction* targetFunction = jsCast<JSFunction*>(boundFunction->targetFunction());
    ConstructData constructData;
    ConstructType constructType = getConstructData(targetFunction, constructData);
    ASSERT(constructType != ConstructType::None);
    return JSValue::encode(construct(exec, targetFunction, constructType, constructData, args));
}

EncodedJSValue JSC_HOST_CALL boundFunctionConstruct(ExecState* exec)
{
    JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->callee());

    ASSERT(isJSArray(boundFunction->boundArgs())); // Currently this is true!
    JSArray* boundArgs = asArray(boundFunction->boundArgs());

    MarkedArgumentBuffer args;
    for (unsigned i = 0; i < boundArgs->length(); ++i)
        args.append(boundArgs->getIndexQuickly(i));
    for (unsigned i = 0; i < exec->argumentCount(); ++i)
        args.append(exec->argument(i));

    JSObject* targetFunction = boundFunction->targetFunction();
    ConstructData constructData;
    ConstructType constructType = getConstructData(targetFunction, constructData);
    ASSERT(constructType != ConstructTypeNone);
    return JSValue::encode(construct(exec, targetFunction, constructType, constructData, args));
}

EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionCall(ExecState* exec)
{
    JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());

    MarkedArgumentBuffer args;
    for (unsigned i = 0; i < exec->argumentCount(); ++i)
        args.append(exec->uncheckedArgument(i));

    JSFunction* targetFunction = jsCast<JSFunction*>(boundFunction->targetFunction());
    ExecutableBase* executable = targetFunction->executable();
    if (executable->hasJITCodeForCall()) {
        // Force the executable to cache its arity entrypoint.
        executable->entrypointFor(CodeForCall, MustCheckArity);
    }
    CallData callData;
    CallType callType = getCallData(targetFunction, callData);
    ASSERT(callType != CallType::None);
    return JSValue::encode(call(exec, targetFunction, callType, callData, boundFunction->boundThis(), args));
}

EncodedJSValue JSC_HOST_CALL boundFunctionCall(ExecState* exec)
{
    JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());

    JSArray* boundArgs = boundFunction->boundArgs();

    MarkedArgumentBuffer args;
    if (boundArgs) {
        for (unsigned i = 0; i < boundArgs->length(); ++i)
            args.append(boundArgs->getIndexQuickly(i));
    }
    for (unsigned i = 0; i < exec->argumentCount(); ++i)
        args.append(exec->uncheckedArgument(i));

    JSObject* targetFunction = boundFunction->targetFunction();
    CallData callData;
    CallType callType = getCallData(targetFunction, callData);
    ASSERT(callType != CallType::None);
    return JSValue::encode(call(exec, targetFunction, callType, callData, boundFunction->boundThis(), args));
}

JSBoundFunction* JSBoundFunction::create(VM& vm, ExecState* exec, JSGlobalObject* globalObject, JSObject* targetFunction, JSValue boundThis, JSArray* boundArgs, int length, const String& name)
{
    auto scope = DECLARE_THROW_SCOPE(vm);
    ConstructData constructData;
    ConstructType constructType = JSC::getConstructData(targetFunction, constructData);
    bool canConstruct = constructType != ConstructType::None;

    bool slowCase = boundArgs || !getJSFunction(targetFunction);

    NativeExecutable* executable = vm.getHostFunction(
        slowCase ? boundFunctionCall : boundThisNoArgsFunctionCall,
        slowCase ? NoIntrinsic : BoundThisNoArgsFunctionCallIntrinsic,
        canConstruct ? (slowCase ? boundFunctionConstruct : boundThisNoArgsFunctionConstruct) : callHostFunctionAsConstructor, nullptr,
        name);
    Structure* structure = getBoundFunctionStructure(vm, exec, globalObject, targetFunction);
    RETURN_IF_EXCEPTION(scope, nullptr);
    JSBoundFunction* function = new (NotNull, allocateCell<JSBoundFunction>(vm.heap)) JSBoundFunction(vm, globalObject, structure, targetFunction, boundThis, boundArgs);

    function->finishCreation(vm, executable, length);
    return function;
}