1  /*
 2   * Copyright (C) 2013-2018 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  #include "config.h"
27  #include "JSArrayBuffer.h"
28  
29  #include "JSCInlines.h"
30  #include "TypedArrayController.h"
31  
32  namespace JSC {
33  
34  const ClassInfo JSArrayBuffer::s_info = {
35      "ArrayBuffer", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSArrayBuffer)};
36  
37  JSArrayBuffer::JSArrayBuffer(VM& vm, Structure* structure, RefPtr<ArrayBuffer>&& arrayBuffer)
38      : Base(vm, structure)
39      , m_impl(arrayBuffer.get())
40  {
41  }
42  
43  void JSArrayBuffer::finishCreation(VM& vm, JSGlobalObject* globalObject)
44  {
45      Base::finishCreation(vm);
46      // This probably causes GCs in the various VMs to overcount the impact of the array buffer.
47      vm.heap.addReference(this, impl());
48      vm.m_typedArrayController->registerWrapper(globalObject, impl(), this);
49  }
50  
51  JSArrayBuffer* JSArrayBuffer::create(
52      VM& vm, Structure* structure, RefPtr<ArrayBuffer>&& buffer)
53  {
54      JSArrayBuffer* result =
55          new (NotNull, allocateCell<JSArrayBuffer>(vm.heap))
56          JSArrayBuffer(vm, structure, WTFMove(buffer));
57      result->finishCreation(vm, structure->globalObject());
58      return result;
59  }
60  
61  Structure* JSArrayBuffer::createStructure(
62      VM& vm, JSGlobalObject* globalObject, JSValue prototype)
63  {
64      return Structure::create(
65          vm, globalObject, prototype, TypeInfo(ArrayBufferType, StructureFlags), info(),
66          NonArray);
67  }
68  
69  bool JSArrayBuffer::isShared() const
70  {
71      return impl()->isShared();
72  }
73  
74  ArrayBufferSharingMode JSArrayBuffer::sharingMode() const
75  {
76      return impl()->sharingMode();
77  }
78  
79  size_t JSArrayBuffer::estimatedSize(JSCell* cell, VM& vm)
80  {
81      JSArrayBuffer* thisObject = jsCast<JSArrayBuffer*>(cell);
82      size_t bufferEstimatedSize = thisObject->impl()->gcSizeEstimateInBytes();
83      return Base::estimatedSize(cell, vm) + bufferEstimatedSize;
84  }
85  
86  } // namespace JSC
87