1  /*
 2   * Copyright (C) 2020 Sony Interactive Entertainment Inc.
 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 "JSArrayBufferPrototype.h"
29  #include "JSGlobalObject.h"
30  
31  namespace JSC  {
32  
33  namespace JSArrayBufferPrototypeInternal {
34  static constexpr bool verbose = false;
35  };
36  
37  ALWAYS_INLINE bool speciesWatchpointIsValid(VM& vm, JSObject* thisObject, ArrayBufferSharingMode mode)
38  {
39      JSGlobalObject* globalObject = thisObject->globalObject(vm);
40      auto* prototype = globalObject->arrayBufferPrototype(mode);
41  
42      if (globalObject->arrayBufferSpeciesWatchpointSet(mode).stateOnJSThread() == ClearWatchpoint) {
43          dataLogLnIf(JSArrayBufferPrototypeInternal::verbose, "Initializing ArrayBuffer species watchpoints for ArrayBuffer.prototype: ", pointerDump(prototype), " with structure: ", pointerDump(prototype->structure(vm)), "\nand ArrayBuffer: ", pointerDump(globalObject->arrayBufferConstructor(mode)), " with structure: ", pointerDump(globalObject->arrayBufferConstructor(mode)->structure(vm)));
44          globalObject->tryInstallArrayBufferSpeciesWatchpoint(mode);
45          ASSERT(globalObject->arrayBufferSpeciesWatchpointSet(mode).stateOnJSThread() != ClearWatchpoint);
46      }
47  
48      return !thisObject->hasCustomProperties(vm)
49          && prototype == thisObject->getPrototypeDirect(vm)
50          && globalObject->arrayBufferSpeciesWatchpointSet(mode).stateOnJSThread() == IsWatched;
51  }
52  
53  ALWAYS_INLINE Optional<JSValue> arrayBufferSpeciesConstructor(JSGlobalObject* globalObject, JSArrayBuffer* thisObject, ArrayBufferSharingMode mode)
54  {
55      VM& vm = globalObject->vm();
56      auto scope = DECLARE_THROW_SCOPE(vm);
57  
58      bool isValid = speciesWatchpointIsValid(vm, thisObject, mode);
59      scope.assertNoException();
60      if (LIKELY(isValid))
61          return WTF::nullopt;
62  
63      RELEASE_AND_RETURN(scope, arrayBufferSpeciesConstructorSlow(globalObject, thisObject, mode));
64  }
65  
66  } // namespace JSC