1  /*
 2   * Copyright (C) 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  #pragma once
27  
28  #include "ObjectPropertyConditionSet.h"
29  #include "StructureSet.h"
30  
31  namespace JSC {
32  
33  class InstanceOfStatus;
34  
35  class InstanceOfVariant {
36      WTF_MAKE_FAST_ALLOCATED;
37  public:
38      InstanceOfVariant() = default;
39      InstanceOfVariant(const StructureSet&, const ObjectPropertyConditionSet&, JSObject* prototype, bool isHit);
40      
41      explicit operator bool() const { return !!m_structureSet.size(); }
42      
43      const StructureSet& structureSet() const { return m_structureSet; }
44      StructureSet& structureSet() { return m_structureSet; }
45      
46      const ObjectPropertyConditionSet& conditionSet() const { return m_conditionSet; }
47      
48      JSObject* prototype() const { return m_prototype; }
49      
50      bool isHit() const { return m_isHit; }
51      
52      bool attemptToMerge(const InstanceOfVariant& other);
53      
54      void dump(PrintStream&) const;
55      void dumpInContext(PrintStream&, DumpContext*) const;
56  
57      bool overlaps(const InstanceOfVariant& other)
58      {
59          return structureSet().overlaps(other.structureSet());
60      }
61      
62  private:
63      friend class InstanceOfStatus;
64      
65      StructureSet m_structureSet;
66      ObjectPropertyConditionSet m_conditionSet;
67      JSObject* m_prototype { nullptr };
68      bool m_isHit { false };
69  };
70  
71  } // namespace JSC
72