Source/JavaScriptCore/runtime/MapConstructor.cpp

/*
 * Copyright (C) 2013-2021 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,
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#include "config.h"
#include "MapConstructor.h"

#include "IteratorOperations.h"
#include "JSCInlines.h"
#include "JSMapInlines.h"
#include "MapPrototype.h"

namespace JSC {

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

void MapConstructor::finishCreation(VM& vm, MapPrototype* mapPrototype, GetterSetter* speciesSymbol)
{
    Base::finishCreation(vm, 0, "Map"_s, PropertyAdditionMode::WithoutStructureTransition);
    putDirectWithoutTransition(vm, vm.propertyNames->prototype, mapPrototype, PropertyAttribute::DontEnum | PropertyAttribute::DontDelete | PropertyAttribute::ReadOnly);
    putDirectNonIndexAccessorWithoutTransition(vm, vm.propertyNames->speciesSymbol, speciesSymbol, PropertyAttribute::Accessor | PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
}

static JSC_DECLARE_HOST_FUNCTION(callMap);
static JSC_DECLARE_HOST_FUNCTION(constructMap);

MapConstructor::MapConstructor(VM& vm, Structure* structure)
    : Base(vm, structure, callMap, constructMap)
{
}

JSC_DEFINE_HOST_FUNCTION(callMap, (JSGlobalObject* globalObject, CallFrame*))
{
    VM& vm = globalObject->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);
    return JSValue::encode(throwConstructorCannotBeCalledAsFunctionTypeError(globalObject, scope, "Map"));
}

JSC_DEFINE_HOST_FUNCTION(constructMap, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
    VM& vm = globalObject->vm();
    auto scope = DECLARE_THROW_SCOPE(vm);

    JSObject* newTarget = asObject(callFrame->newTarget());
    Structure* mapStructure = JSC_GET_DERIVED_STRUCTURE(vm, mapStructure, newTarget, callFrame->jsCallee());
    RETURN_IF_EXCEPTION(scope, { });

    JSValue iterable = callFrame->argument(0);
    if (iterable.isUndefinedOrNull())
        RELEASE_AND_RETURN(scope, JSValue::encode(JSMap::create(globalObject, vm, mapStructure)));

    bool canPerformFastSet = JSMap::isSetFastAndNonObservable(mapStructure);
    if (auto* iterableMap = jsDynamicCast<JSMap*>(iterable)) {
        if (canPerformFastSet && iterableMap->isIteratorProtocolFastAndNonObservable())
            RELEASE_AND_RETURN(scope, JSValue::encode(iterableMap->clone(globalObject, vm, mapStructure)));
    }

    JSMap* map = JSMap::create(globalObject, vm, mapStructure);
    RETURN_IF_EXCEPTION(scope, encodedJSValue());

    JSValue adderFunction;
    CallData adderFunctionCallData;
    if (!canPerformFastSet) {
        adderFunction = map->JSObject::get(globalObject, vm.propertyNames->set);
        RETURN_IF_EXCEPTION(scope, { });

        adderFunctionCallData = JSC::getCallData(adderFunction);
        if (UNLIKELY(adderFunctionCallData.type == CallData::Type::None))
            return throwVMTypeError(globalObject, scope, "'set' property of a Map should be callable."_s);
    }

    scope.release();
    forEachInIterable(globalObject, iterable, [&](VM& vm, JSGlobalObject* globalObject, JSValue nextItem) {
        auto scope = DECLARE_THROW_SCOPE(vm);
        if (!nextItem.isObject()) {
            throwTypeError(globalObject, scope);
            return;
        }

        JSObject* nextObject = asObject(nextItem);

        JSValue key = nextObject->getIndex(globalObject, static_cast<unsigned>(0));
        RETURN_IF_EXCEPTION(scope, void());

        JSValue value = nextObject->getIndex(globalObject, static_cast<unsigned>(1));
        RETURN_IF_EXCEPTION(scope, void());

        scope.release();
        if (canPerformFastSet) {
            map->set(mapStructure->globalObject(), key, value);
            return;
        }

        MarkedArgumentBuffer arguments;
        arguments.append(key);
        arguments.append(value);
        ASSERT(!arguments.hasOverflowed());
        call(globalObject, adderFunction, adderFunctionCallData, map, arguments);
    });

    return JSValue::encode(map);
}

JSC_DEFINE_HOST_FUNCTION(mapPrivateFuncMapBucketHead, (JSGlobalObject*, CallFrame* callFrame))
{
    ASSERT(jsDynamicCast<JSMap*>(callFrame->argument(0)));
    JSMap* map = jsCast<JSMap*>(callFrame->uncheckedArgument(0));
    auto* head = map->head();
    ASSERT(head);
    return JSValue::encode(head);
}

JSC_DEFINE_HOST_FUNCTION(mapPrivateFuncMapBucketNext, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
    ASSERT(jsDynamicCast<JSMap::BucketType*>(callFrame->argument(0)));
    auto* bucket = jsCast<JSMap::BucketType*>(callFrame->uncheckedArgument(0));
    ASSERT(bucket);
    bucket = bucket->next();
    while (bucket) {
        if (!bucket->deleted())
            return JSValue::encode(bucket);
        bucket = bucket->next();
    }
    return JSValue::encode(globalObject->vm().sentinelMapBucket());
}

JSC_DEFINE_HOST_FUNCTION(mapPrivateFuncMapBucketKey, (JSGlobalObject*, CallFrame* callFrame))
{
    ASSERT(jsDynamicCast<JSMap::BucketType*>(callFrame->argument(0)));
    auto* bucket = jsCast<JSMap::BucketType*>(callFrame->uncheckedArgument(0));
    ASSERT(bucket);
    return JSValue::encode(bucket->key());
}

JSC_DEFINE_HOST_FUNCTION(mapPrivateFuncMapBucketValue, (JSGlobalObject*, CallFrame* callFrame))
{
    ASSERT(jsDynamicCast<JSMap::BucketType*>(callFrame->argument(0)));
    auto* bucket = jsCast<JSMap::BucketType*>(callFrame->uncheckedArgument(0));
    ASSERT(bucket);
    return JSValue::encode(bucket->value());
}

}