Source/JavaScriptCore/runtime/WeakMapConstructor.cpp

/*
 * Copyright (C) 2013 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.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    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
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "WeakMapConstructor.h"

#include "Error.h"
#include "IteratorOperations.h"
#include "JSCJSValueInlines.h"
#include "JSCellInlines.h"
#include "JSGlobalObject.h"
#include "JSWeakMap.h"
#include "StructureInlines.h"
#include "WeakMapPrototype.h"

namespace JSC {

const ClassInfo WeakMapConstructor::s_info = { "Function", &Base::s_info, 0, CREATE_METHOD_TABLE(WeakMapConstructor) };

void WeakMapConstructor::finishCreation(VM& vm, WeakMapPrototype* prototype)
{
    Base::finishCreation(vm, prototype->classInfo()->className);
    putDirectWithoutTransition(vm, vm.propertyNames->prototype, prototype, DontEnum | DontDelete | ReadOnly);
    putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(0), ReadOnly | DontEnum | DontDelete);
}

static EncodedJSValue JSC_HOST_CALL callWeakMap(ExecState* exec)
{
    return JSValue::encode(throwTypeError(exec, ASCIILiteral("WeakMap cannot be called as a function")));
}

static EncodedJSValue JSC_HOST_CALL constructWeakMap(ExecState* exec)
{
    JSGlobalObject* globalObject = asInternalFunction(exec->callee())->globalObject();
    Structure* weakMapStructure = InternalFunction::createSubclassStructure(exec, exec->newTarget(), globalObject->weakMapStructure());
    JSWeakMap* weakMap = JSWeakMap::create(exec, weakMapStructure);
    JSValue iterable = exec->argument(0);
    if (iterable.isUndefinedOrNull())
        return JSValue::encode(weakMap);

    JSValue adderFunction = weakMap->JSObject::get(exec, exec->propertyNames().set);
    if (exec->hadException())
        return JSValue::encode(jsUndefined());

    CallData adderFunctionCallData;
    CallType adderFunctionCallType = getCallData(adderFunction, adderFunctionCallData);
    if (adderFunctionCallType == CallTypeNone)
        return JSValue::encode(throwTypeError(exec));

    JSValue iteratorFunction = iterable.get(exec, exec->propertyNames().iteratorSymbol);
    if (exec->hadException())
        return JSValue::encode(jsUndefined());

    CallData iteratorFunctionCallData;
    CallType iteratorFunctionCallType = getCallData(iteratorFunction, iteratorFunctionCallData);
    if (iteratorFunctionCallType == CallTypeNone)
        return JSValue::encode(throwTypeError(exec));

    ArgList iteratorFunctionArguments;
    JSValue iterator = call(exec, iteratorFunction, iteratorFunctionCallType, iteratorFunctionCallData, iterable, iteratorFunctionArguments);
    if (exec->hadException())
        return JSValue::encode(jsUndefined());

    if (!iterator.isObject())
        return JSValue::encode(throwTypeError(exec));

    while (true) {
        JSValue next = iteratorStep(exec, iterator);
        if (exec->hadException())
            return JSValue::encode(jsUndefined());

        if (next.isFalse())
            return JSValue::encode(weakMap);

        JSValue nextItem = iteratorValue(exec, next);
        if (exec->hadException())
            return JSValue::encode(jsUndefined());

        if (!nextItem.isObject()) {
            throwTypeError(exec);
            iteratorClose(exec, iterator);
            return JSValue::encode(jsUndefined());
        }

        JSValue key = nextItem.get(exec, 0);
        if (exec->hadException()) {
            iteratorClose(exec, iterator);
            return JSValue::encode(jsUndefined());
        }

        JSValue value = nextItem.get(exec, 1);
        if (exec->hadException()) {
            iteratorClose(exec, iterator);
            return JSValue::encode(jsUndefined());
        }

        MarkedArgumentBuffer arguments;
        arguments.append(key);
        arguments.append(value);
        call(exec, adderFunction, adderFunctionCallType, adderFunctionCallData, weakMap, arguments);
        if (exec->hadException()) {
            iteratorClose(exec, iterator);
            return JSValue::encode(jsUndefined());
        }
    }
    RELEASE_ASSERT_NOT_REACHED();
    return JSValue::encode(weakMap);
}

ConstructType WeakMapConstructor::getConstructData(JSCell*, ConstructData& constructData)
{
    constructData.native.function = constructWeakMap;
    return ConstructTypeHost;
}

CallType WeakMapConstructor::getCallData(JSCell*, CallData& callData)
{
    callData.native.function = callWeakMap;
    return CallTypeHost;
}

}