Source/JavaScriptCore/runtime/WeakObjectRefConstructor.cpp

/*
 * Copyright (C) 2019 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
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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#include "config.h"
#include "WeakObjectRefConstructor.h"

#include "Error.h"
#include "IteratorOperations.h"
#include "JSCInlines.h"
#include "JSGlobalObject.h"
#include "JSObjectInlines.h"
#include "JSWeakObjectRef.h"
#include "WeakObjectRefPrototype.h"

namespace JSC {

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

void WeakObjectRefConstructor::finishCreation(VM& vm, WeakObjectRefPrototype* prototype)
{
    Base::finishCreation(vm, "WeakRef"_s, NameVisibility::Visible, NameAdditionMode::WithoutStructureTransition);
    putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly);
}

static EncodedJSValue JSC_HOST_CALL callWeakRef(ExecState*);
static EncodedJSValue JSC_HOST_CALL constructWeakRef(ExecState*);

WeakObjectRefConstructor::WeakObjectRefConstructor(VM& vm, Structure* structure)
    : Base(vm, structure, callWeakRef, constructWeakRef)
{
}

static EncodedJSValue JSC_HOST_CALL callWeakRef(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);
    return JSValue::encode(throwConstructorCannotBeCalledAsFunctionTypeError(exec, scope, "WeakRef"));
}

static EncodedJSValue JSC_HOST_CALL constructWeakRef(ExecState* exec)
{
    VM& vm = exec->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    if (!exec->argument(0).isObject())
        return throwVMTypeError(exec, scope, "First argument to WeakRef should be an object"_s);

    JSGlobalObject* globalObject = jsCast<InternalFunction*>(exec->jsCallee())->globalObject(vm);
    Structure* WeakObjectRefStructure = InternalFunction::createSubclassStructure(exec, exec->newTarget(), globalObject->weakObjectRefStructure());
    RETURN_IF_EXCEPTION(scope, encodedJSValue());
    RELEASE_AND_RETURN(scope, JSValue::encode(JSWeakObjectRef::create(vm, WeakObjectRefStructure, exec->uncheckedArgument(0).getObject())));
}

}