Source/JavaScriptCore/runtime/JSCustomGetterSetterFunction.cpp

/*
 * Copyright (C) 2015, 2016 Apple Inc. All rights reserved.
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#include "config.h"
#include "JSCustomGetterSetterFunction.h"

#include "CustomGetterSetter.h"
#include "GetterSetter.h"
#include "JSCInlines.h"
#include "JSGlobalObject.h"

namespace JSC {

const ClassInfo JSCustomGetterSetterFunction::s_info = { "Function", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSCustomGetterSetterFunction) };

EncodedJSValue JSC_HOST_CALL JSCustomGetterSetterFunction::customGetterSetterFunctionCall(JSGlobalObject* globalObject, CallFrame* callFrame)
{
    VM& vm = globalObject->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSCustomGetterSetterFunction* customGetterSetterFunction = jsCast<JSCustomGetterSetterFunction*>(callFrame->jsCallee());
    CustomGetterSetter* customGetterSetter = customGetterSetterFunction->customGetterSetter();
    JSValue thisValue = callFrame->thisValue();

    if (customGetterSetterFunction->isSetter()) {
        CustomGetterSetter::CustomSetter setter = customGetterSetter->setter();
        ASSERT(setter);
        callCustomSetter(callFrame, setter, true, thisValue, callFrame->argument(0));
        return JSValue::encode(jsUndefined());
    }

    if (customGetterSetter->inherits<DOMAttributeGetterSetter>(vm)) {
        auto domAttribute = jsCast<DOMAttributeGetterSetter*>(customGetterSetter)->domAttribute();
        if (!thisValue.inherits(vm, domAttribute.classInfo))
            return throwVMDOMAttributeGetterTypeError(callFrame, scope, domAttribute.classInfo, customGetterSetterFunction->propertyName());
    }

    return customGetterSetter->getter()(callFrame, JSValue::encode(thisValue), customGetterSetterFunction->propertyName());
}

JSCustomGetterSetterFunction::JSCustomGetterSetterFunction(VM& vm, JSGlobalObject* globalObject, Structure* structure, const Type type, const PropertyName& propertyName)
    : Base(vm, globalObject, structure)
    , m_type(type)
    , m_propertyName(propertyName)
{
}

JSCustomGetterSetterFunction* JSCustomGetterSetterFunction::create(VM& vm, JSGlobalObject* globalObject, CustomGetterSetter* getterSetter, const Type type, const PropertyName& propertyName)
{
    ASSERT(type == Type::Getter ? !!getterSetter->getter() : !!getterSetter->setter());

    const char* prefix = (type == Type::Getter) ? "get " : "set ";
    String name = makeString(prefix, String(propertyName.publicName()));

    NativeExecutable* executable = vm.getHostFunction(customGetterSetterFunctionCall, callHostFunctionAsConstructor, String(propertyName.publicName()));

    Structure* structure = globalObject->customGetterSetterFunctionStructure();
    JSCustomGetterSetterFunction* function = new (NotNull, allocateCell<JSCustomGetterSetterFunction>(vm.heap)) JSCustomGetterSetterFunction(vm, globalObject, structure, type, propertyName);

    // Can't do this during initialization because getHostFunction might do a GC allocation.
    function->finishCreation(vm, executable, getterSetter, name);
    return function;
}

void JSCustomGetterSetterFunction::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
    JSCustomGetterSetterFunction* thisObject = jsCast<JSCustomGetterSetterFunction*>(cell);
    ASSERT_GC_OBJECT_INHERITS(thisObject, info());
    Base::visitChildren(thisObject, visitor);

    visitor.append(thisObject->m_getterSetter);
}

void JSCustomGetterSetterFunction::finishCreation(VM& vm, NativeExecutable* executable, CustomGetterSetter* getterSetter, const String& name)
{
    Base::finishCreation(vm, executable, isSetter(), name);
    ASSERT(inherits(vm, info()));
    ASSERT(getterSetter);
    m_getterSetter.set(vm, this, getterSetter);
}

} // namespace JSC