1  /*
 2   *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
 3   *  Copyright (C) 2001 Peter Kelly (pmk@post.com)
 4   *  Copyright (C) 2003-2020 Apple Inc. All rights reserved.
 5   *
 6   *  This library is free software; you can redistribute it and/or
 7   *  modify it under the terms of the GNU Library General Public
 8   *  License as published by the Free Software Foundation; either
 9   *  version 2 of the License, or (at your option) any later version.
10   *
11   *  This library is distributed in the hope that it will be useful,
12   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14   *  Library General Public License for more details.
15   *
16   *  You should have received a copy of the GNU Library General Public License
17   *  along with this library; see the file COPYING.LIB.  If not, write to
18   *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19   *  Boston, MA 02110-1301, USA.
20   *
21   */
22  
23  #pragma once
24  
25  #include "CallFrame.h"
26  #include "JSCJSValue.h"
27  #include "JSCast.h"
28  #include "Structure.h"
29  
30  namespace JSC {
31  
32  class JSAPIValueWrapper final : public JSCell {
33      friend JSValue jsAPIValueWrapper(JSGlobalObject*, JSValue);
34  public:
35      using Base = JSCell;
36      static constexpr unsigned StructureFlags = Base::StructureFlags | StructureIsImmortal;
37  
38      template<typename CellType, SubspaceAccess mode>
39      static IsoSubspace* subspaceFor(VM& vm)
40      {
41          return vm.apiValueWrapperSpace<mode>();
42      }
43  
44      JSValue value() const { return m_value.get(); }
45  
46      static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
47      {
48          return Structure::create(vm, globalObject, prototype, TypeInfo(APIValueWrapperType, StructureFlags), info());
49      }
50  
51      DECLARE_EXPORT_INFO;
52  
53      static JSAPIValueWrapper* create(VM& vm, JSValue value)
54      {
55          JSAPIValueWrapper* wrapper = new (NotNull, allocateCell<JSAPIValueWrapper>(vm.heap)) JSAPIValueWrapper(vm);
56          wrapper->finishCreation(vm, value);
57          return wrapper;
58      }
59  
60  private:
61      void finishCreation(VM& vm, JSValue value)
62      {
63          Base::finishCreation(vm);
64          m_value.set(vm, this, value);
65          ASSERT(!value.isCell());
66      }
67  
68      JSAPIValueWrapper(VM& vm)
69          : JSCell(vm, vm.apiWrapperStructure.get())
70      {
71      }
72  
73      WriteBarrier<Unknown> m_value;
74  };
75  
76  } // namespace JSC