1  /*
 2   * Copyright (C) 2019-2020 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. AND ITS CONTRIBUTORS ``AS IS''
14   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16   * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17   * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23   * THE POSSIBILITY OF SUCH DAMAGE.
24   */
25  
26  #include "config.h"
27  #include "CachedSpecialPropertyAdaptiveStructureWatchpoint.h"
28  
29  #include "JSCellInlines.h"
30  #include "StructureRareData.h"
31  
32  namespace JSC {
33  
34  CachedSpecialPropertyAdaptiveStructureWatchpoint::CachedSpecialPropertyAdaptiveStructureWatchpoint(const ObjectPropertyCondition& key, StructureRareData* structureRareData)
35      : Watchpoint(Watchpoint::Type::CachedSpecialPropertyAdaptiveStructure)
36      , m_structureRareData(structureRareData)
37      , m_key(key)
38  {
39      RELEASE_ASSERT(key.watchingRequiresStructureTransitionWatchpoint());
40      RELEASE_ASSERT(!key.watchingRequiresReplacementWatchpoint());
41  }
42  
43  void CachedSpecialPropertyAdaptiveStructureWatchpoint::install(VM& vm)
44  {
45      RELEASE_ASSERT(m_key.isWatchable());
46  
47      m_key.object()->structure(vm)->addTransitionWatchpoint(this);
48  }
49  
50  void CachedSpecialPropertyAdaptiveStructureWatchpoint::fireInternal(VM& vm, const FireDetail&)
51  {
52      if (!m_structureRareData->isLive())
53          return;
54  
55      if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
56          install(vm);
57          return;
58      }
59  
60      CachedSpecialPropertyKey key = CachedSpecialPropertyKey::ToStringTag;
61      if (m_key.uid() == vm.propertyNames->toStringTagSymbol.impl())
62          key = CachedSpecialPropertyKey::ToStringTag;
63      else if (m_key.uid() == vm.propertyNames->toString.impl())
64          key = CachedSpecialPropertyKey::ToString;
65      else if (m_key.uid() == vm.propertyNames->valueOf.impl())
66          key = CachedSpecialPropertyKey::ValueOf;
67      else {
68          ASSERT(m_key.uid() == vm.propertyNames->toPrimitiveSymbol.impl());
69          key = CachedSpecialPropertyKey::ToPrimitive;
70      }
71  
72      m_structureRareData->clearCachedSpecialProperty(key);
73  }
74  
75  } // namespace JSC