Source/JavaScriptCore/runtime/JSModuleNamespaceObject.h

/*
 * Copyright (C) 2015-2020 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "AbstractModuleRecord.h"
#include "JSDestructibleObject.h"

namespace JSC {

class JSModuleNamespaceObject final : public JSNonFinalObject {
public:
    using Base = JSNonFinalObject;
    static constexpr unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | OverridesAnyFormOfGetPropertyNames | GetOwnPropertySlotIsImpureForPropertyAbsence | IsImmutablePrototypeExoticObject;

    static constexpr bool needsDestruction = true;
    static void destroy(JSCell*);

    template<typename CellType, SubspaceAccess mode>
    static IsoSubspace* subspaceFor(VM& vm)
    {
        return vm.moduleNamespaceObjectSpace<mode>();
    }

    static JSModuleNamespaceObject* create(JSGlobalObject* globalObject, Structure* structure, AbstractModuleRecord* moduleRecord, Vector<std::pair<Identifier, AbstractModuleRecord::Resolution>>&& resolutions)
    {
        VM& vm = getVM(globalObject);
        JSModuleNamespaceObject* object = new (NotNull, allocateCell<JSModuleNamespaceObject>(vm.heap)) JSModuleNamespaceObject(vm, structure);
        object->finishCreation(globalObject, moduleRecord, WTFMove(resolutions));
        return object;
    }

    JS_EXPORT_PRIVATE static bool getOwnPropertySlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
    JS_EXPORT_PRIVATE static bool getOwnPropertySlotByIndex(JSObject*, JSGlobalObject*, unsigned propertyName, PropertySlot&);
    JS_EXPORT_PRIVATE static bool put(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
    JS_EXPORT_PRIVATE static bool putByIndex(JSCell*, JSGlobalObject*, unsigned propertyName, JSValue, bool shouldThrow);
    JS_EXPORT_PRIVATE static bool deleteProperty(JSCell*, JSGlobalObject*, PropertyName, DeletePropertySlot&);
    JS_EXPORT_PRIVATE static void getOwnPropertyNames(JSObject*, JSGlobalObject*, PropertyNameArray&, EnumerationMode);
    JS_EXPORT_PRIVATE static bool defineOwnProperty(JSObject*, JSGlobalObject*, PropertyName, const PropertyDescriptor&, bool shouldThrow);

    DECLARE_EXPORT_INFO;

    static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
    {
        return Structure::create(vm, globalObject, prototype, TypeInfo(ModuleNamespaceObjectType, StructureFlags), info());
    }

    AbstractModuleRecord* moduleRecord() { return m_moduleRecord.get(); }

private:
    JS_EXPORT_PRIVATE JSModuleNamespaceObject(VM&, Structure*);
    JS_EXPORT_PRIVATE void finishCreation(JSGlobalObject*, AbstractModuleRecord*, Vector<std::pair<Identifier, AbstractModuleRecord::Resolution>>&&);
    static void visitChildren(JSCell*, SlotVisitor&);
    bool getOwnPropertySlotCommon(JSGlobalObject*, PropertyName, PropertySlot&);

    struct ExportEntry {
        Identifier localName;
        WriteBarrier<AbstractModuleRecord> moduleRecord;
    };

    typedef HashMap<RefPtr<UniquedStringImpl>, ExportEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>> ExportMap;

    ExportMap m_exports;
    Vector<Identifier> m_names;
    WriteBarrier<AbstractModuleRecord> m_moduleRecord;

    friend size_t cellSize(VM&, JSCell*);
};

} // namespace JSC