1  /*
 2   * Copyright (C) 2015-2020 Apple Inc. All rights reserved.
 3   *
 4   * Redistribution and use in source and binary forms, with or without
 5   * modification, are permitted provided that the following conditions
 6   * are met:
 7   * 1. Redistributions of source code must retain the above copyright
 8   *    notice, this list of conditions and the following disclaimer.
 9   * 2. Redistributions in binary form must reproduce the above copyright
10   *    notice, this list of conditions and the following disclaimer in the
11   *    documentation and/or other materials provided with the distribution.
12   *
13   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24   */
25  
26  #pragma once
27  
28  #include "AbstractModuleRecord.h"
29  #include "JSDestructibleObject.h"
30  
31  namespace JSC {
32  
33  class JSModuleNamespaceObject final : public JSNonFinalObject {
34  public:
35      using Base = JSNonFinalObject;
36      static constexpr unsigned StructureFlags = Base::StructureFlags | OverridesGetOwnPropertySlot | OverridesGetOwnPropertyNames | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | GetOwnPropertySlotIsImpureForPropertyAbsence | IsImmutablePrototypeExoticObject;
37  
38      static constexpr bool needsDestruction = true;
39      static void destroy(JSCell*);
40  
41      template<typename CellType, SubspaceAccess mode>
42      static IsoSubspace* subspaceFor(VM& vm)
43      {
44          return vm.moduleNamespaceObjectSpace<mode>();
45      }
46  
47      static JSModuleNamespaceObject* create(JSGlobalObject* globalObject, Structure* structure, AbstractModuleRecord* moduleRecord, Vector<std::pair<Identifier, AbstractModuleRecord::Resolution>>&& resolutions)
48      {
49          VM& vm = getVM(globalObject);
50          JSModuleNamespaceObject* object = new (NotNull, allocateCell<JSModuleNamespaceObject>(vm.heap)) JSModuleNamespaceObject(vm, structure);
51          object->finishCreation(globalObject, moduleRecord, WTFMove(resolutions));
52          return object;
53      }
54  
55      JS_EXPORT_PRIVATE static bool getOwnPropertySlot(JSObject*, JSGlobalObject*, PropertyName, PropertySlot&);
56      JS_EXPORT_PRIVATE static bool getOwnPropertySlotByIndex(JSObject*, JSGlobalObject*, unsigned propertyName, PropertySlot&);
57      JS_EXPORT_PRIVATE static bool put(JSCell*, JSGlobalObject*, PropertyName, JSValue, PutPropertySlot&);
58      JS_EXPORT_PRIVATE static bool putByIndex(JSCell*, JSGlobalObject*, unsigned propertyName, JSValue, bool shouldThrow);
59      JS_EXPORT_PRIVATE static bool deleteProperty(JSCell*, JSGlobalObject*, PropertyName, DeletePropertySlot&);
60      JS_EXPORT_PRIVATE static void getOwnPropertyNames(JSObject*, JSGlobalObject*, PropertyNameArray&, DontEnumPropertiesMode);
61      JS_EXPORT_PRIVATE static bool defineOwnProperty(JSObject*, JSGlobalObject*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
62  
63      DECLARE_EXPORT_INFO;
64  
65      static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
66      {
67          return Structure::create(vm, globalObject, prototype, TypeInfo(ModuleNamespaceObjectType, StructureFlags), info());
68      }
69  
70      AbstractModuleRecord* moduleRecord() { return m_moduleRecord.get(); }
71  
72  private:
73      JS_EXPORT_PRIVATE JSModuleNamespaceObject(VM&, Structure*);
74      JS_EXPORT_PRIVATE void finishCreation(JSGlobalObject*, AbstractModuleRecord*, Vector<std::pair<Identifier, AbstractModuleRecord::Resolution>>&&);
75      static void visitChildren(JSCell*, SlotVisitor&);
76      bool getOwnPropertySlotCommon(JSGlobalObject*, PropertyName, PropertySlot&);
77  
78      struct ExportEntry {
79          Identifier localName;
80          WriteBarrier<AbstractModuleRecord> moduleRecord;
81      };
82  
83      typedef HashMap<RefPtr<UniquedStringImpl>, ExportEntry, IdentifierRepHash, HashTraits<RefPtr<UniquedStringImpl>>> ExportMap;
84  
85      ExportMap m_exports;
86      Vector<Identifier> m_names;
87      WriteBarrier<AbstractModuleRecord> m_moduleRecord;
88  
89      friend size_t cellSize(VM&, JSCell*);
90  };
91  
92  } // namespace JSC