1  /*
 2   * Copyright (C) 2013, 2016 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 "SimpleTypedArrayController.h"
28  
29  #include "ArrayBuffer.h"
30  #include "JSArrayBuffer.h"
31  #include "JSCJSValueInlines.h"
32  #include "JSGlobalObject.h"
33  
34  namespace JSC {
35  
36  SimpleTypedArrayController::SimpleTypedArrayController(bool allowAtomicsWait)
37      : m_allowAtomicsWait(allowAtomicsWait)
38  {
39  }
40  
41  SimpleTypedArrayController::~SimpleTypedArrayController() { }
42  
43  JSArrayBuffer* SimpleTypedArrayController::toJS(JSGlobalObject* lexicalGlobalObject, JSGlobalObject* globalObject, ArrayBuffer* native)
44  {
45      UNUSED_PARAM(lexicalGlobalObject);
46      if (JSArrayBuffer* buffer = native->m_wrapper.get())
47          return buffer;
48  
49      // The JSArrayBuffer::create function will register the wrapper in finishCreation.
50      JSArrayBuffer* result = JSArrayBuffer::create(globalObject->vm(), globalObject->arrayBufferStructure(native->sharingMode()), native);
51      return result;
52  }
53  
54  void SimpleTypedArrayController::registerWrapper(JSGlobalObject*, ArrayBuffer* native, JSArrayBuffer* wrapper)
55  {
56      ASSERT(!native->m_wrapper);
57      native->m_wrapper = Weak<JSArrayBuffer>(wrapper, &m_owner);
58  }
59  
60  bool SimpleTypedArrayController::isAtomicsWaitAllowedOnCurrentThread()
61  {
62      return m_allowAtomicsWait;
63  }
64  
65  bool SimpleTypedArrayController::JSArrayBufferOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, JSC::SlotVisitor& visitor, const char** reason)
66  {
67      if (UNLIKELY(reason))
68          *reason = "JSArrayBuffer is opaque root";
69      auto& wrapper = *JSC::jsCast<JSC::JSArrayBuffer*>(handle.slot()->asCell());
70      return visitor.containsOpaqueRoot(wrapper.impl());
71  }
72  
73  void SimpleTypedArrayController::JSArrayBufferOwner::finalize(JSC::Handle<JSC::Unknown>, void*) { }
74  
75  } // namespace JSC
76