1  /*
 2   * Copyright (C) 2015-2017 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 "ObjectPropertyCondition.h"
29  #include "Watchpoint.h"
30  #include <wtf/FastMalloc.h>
31  #include <wtf/Noncopyable.h>
32  
33  namespace JSC {
34  
35  // FIXME: This isn't actually a Watchpoint. We should probably have a name which better reflects that:
36  // https://bugs.webkit.org/show_bug.cgi?id=202381
37  class AdaptiveInferredPropertyValueWatchpointBase {
38      WTF_MAKE_NONCOPYABLE(AdaptiveInferredPropertyValueWatchpointBase);
39      WTF_MAKE_FAST_ALLOCATED;
40  
41  public:
42      AdaptiveInferredPropertyValueWatchpointBase(const ObjectPropertyCondition&);
43  
44      const ObjectPropertyCondition& key() const { return m_key; }
45  
46      void install(VM&);
47  
48      virtual ~AdaptiveInferredPropertyValueWatchpointBase() = default;
49  
50      class StructureWatchpoint final : public Watchpoint {
51      public:
52          StructureWatchpoint()
53              : Watchpoint(Watchpoint::Type::AdaptiveInferredPropertyValueStructure)
54          { }
55  
56          void fireInternal(VM&, const FireDetail&);
57      };
58      // Own destructor may not be called. Keep members trivially destructible.
59      static_assert(sizeof(StructureWatchpoint) == sizeof(Watchpoint), "");
60  
61      class PropertyWatchpoint final : public Watchpoint {
62      public:
63          PropertyWatchpoint()
64              : Watchpoint(Watchpoint::Type::AdaptiveInferredPropertyValueProperty)
65          { }
66  
67          void fireInternal(VM&, const FireDetail&);
68      };
69      // Own destructor may not be called. Keep members trivially destructible.
70      static_assert(sizeof(PropertyWatchpoint) == sizeof(Watchpoint), "");
71  
72  protected:
73      virtual bool isValid() const;
74      virtual void handleFire(VM&, const FireDetail&) = 0;
75  
76  private:
77      void fire(VM&, const FireDetail&);
78  
79      ObjectPropertyCondition m_key;
80      StructureWatchpoint m_structureWatchpoint;
81      PropertyWatchpoint m_propertyWatchpoint;
82  };
83  
84  } // namespace JSC