1  /*
 2   * Copyright (C) 2014 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 "InternalFunction.h"
29  
30  namespace JSC {
31  
32  class NullGetterFunction final : public InternalFunction {
33  public:
34      typedef InternalFunction Base;
35  
36      static NullGetterFunction* create(VM& vm, Structure* structure)
37      {
38          // Since NullGetterFunction is per JSGlobalObject, we use put-without-transition in InternalFunction::finishCreation.
39          NullGetterFunction* function = new (NotNull, allocateCell< NullGetterFunction>(vm.heap))  NullGetterFunction(vm, structure);
40          function->finishCreation(vm, 0, String(), PropertyAdditionMode::WithoutStructureTransition);
41          return function;
42      }
43  
44      DECLARE_EXPORT_INFO;
45  
46      static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
47      {
48          return Structure::create(vm, globalObject, prototype, TypeInfo(InternalFunctionType, StructureFlags), info());
49      }
50  
51  private:
52      NullGetterFunction(VM&, Structure*);
53  };
54  STATIC_ASSERT_ISO_SUBSPACE_SHARABLE(NullGetterFunction, InternalFunction);
55  
56  } // namespace JSC