Source/JavaScriptCore/runtime/SetConstructor.cpp

/*
 * Copyright (C) 2013, 2016 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
 *    notice, this list of conditions and the following disclaimer.
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 *    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 INC. ``AS IS'' AND ANY
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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#include "config.h"
#include "SetConstructor.h"

#include "Error.h"
#include "GetterSetter.h"
#include "IteratorOperations.h"
#include "JSCInlines.h"
#include "JSGlobalObject.h"
#include "JSObjectInlines.h"
#include "JSSet.h"
#include "SetPrototype.h"

namespace JSC {

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

void SetConstructor::finishCreation(VM& vm, SetPrototype* setPrototype, GetterSetter* speciesSymbol)
{
    Base::finishCreation(vm, setPrototype->classInfo(vm)->className);
    putDirectWithoutTransition(vm, vm.propertyNames->prototype, setPrototype, DontEnum | DontDelete | ReadOnly);
    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(0), DontEnum | ReadOnly);
    putDirectNonIndexAccessor(vm, vm.propertyNames->speciesSymbol, speciesSymbol, Accessor | ReadOnly | DontEnum);
}

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

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

    JSGlobalObject* globalObject = asInternalFunction(exec->jsCallee())->globalObject();
    Structure* setStructure = InternalFunction::createSubclassStructure(exec, exec->newTarget(), globalObject->setStructure());
    RETURN_IF_EXCEPTION(scope, encodedJSValue());

    JSValue iterable = exec->argument(0);
    if (iterable.isUndefinedOrNull())
        return JSValue::encode(JSSet::create(exec, vm, setStructure));

    if (isJSSet(iterable)) {
        JSSet* iterableSet = jsCast<JSSet*>(iterable);
        if (iterableSet->canCloneFastAndNonObservable(setStructure))
            return JSValue::encode(iterableSet->clone(exec, vm, setStructure));
    }

    JSSet* set = JSSet::create(exec, vm, setStructure);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());

    JSValue adderFunction = set->JSObject::get(exec, vm.propertyNames->add);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());

    CallData adderFunctionCallData;
    CallType adderFunctionCallType = getCallData(adderFunction, adderFunctionCallData);
    if (UNLIKELY(adderFunctionCallType == CallType::None))
        return JSValue::encode(throwTypeError(exec, scope));

    scope.release();
    forEachInIterable(exec, iterable, [&](VM&, ExecState* exec, JSValue nextValue) {
        MarkedArgumentBuffer arguments;
        arguments.append(nextValue);
        call(exec, adderFunction, adderFunctionCallType, adderFunctionCallData, set, arguments);
    });

    return JSValue::encode(set);
}

ConstructType SetConstructor::getConstructData(JSCell*, ConstructData& constructData)
{
    constructData.native.function = constructSet;
    return ConstructType::Host;
}

CallType SetConstructor::getCallData(JSCell*, CallData& callData)
{
    callData.native.function = callSet;
    return CallType::Host;
}

}