1  /*
 2   * Copyright (C) 2011-2018 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 "DumpContext.h"
29  #include "Structure.h"
30  #include <wtf/TinyPtrSet.h>
31  
32  namespace JSC {
33  
34  class TrackedReferences;
35  
36  class StructureSet : public TinyPtrSet<Structure*> {
37  public:
38      // I really want to do this:
39      // using TinyPtrSet::TinyPtrSet;
40      //
41      // But I can't because Windows.
42      
43      StructureSet()
44      {
45      }
46      
47      StructureSet(Structure* structure)
48          : TinyPtrSet(structure)
49      {
50      }
51      
52      Structure* onlyStructure() const
53      {
54          return onlyEntry();
55      }
56  
57      void markIfCheap(SlotVisitor&) const;
58      bool isStillAlive(VM&) const;
59      
60      void dumpInContext(PrintStream&, DumpContext*) const;
61      void dump(PrintStream&) const;
62  };
63  
64  } // namespace JSC