bytecode/ConstantStructureCheck.h

   1 /*
   2  * Copyright (C) 2014 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 #ifndef ConstantStructureCheck_h
  27 #define ConstantStructureCheck_h
  28
  29 #include "DumpContext.h"
  30 #include "JSCell.h"
  31 #include "Structure.h"
  32 #include <wtf/PrintStream.h>
  33 #include <wtf/Vector.h>
  34
  35 namespace JSC {
  36
  37 class ConstantStructureCheck {
  38 public:
  39     ConstantStructureCheck()
  40         : m_constant(nullptr)
  41         , m_structure(nullptr)
  42     {
  43     }
  44
  45     ConstantStructureCheck(JSCell* constant, Structure* structure)
  46         : m_constant(constant)
  47         , m_structure(structure)
  48     {
  49         ASSERT(!!m_constant == !!m_structure);
  50     }
  51
  52     bool operator!() const { return !m_constant; }
  53
  54     JSCell* constant() const { return m_constant; }
  55     Structure* structure() const { return m_structure; }
  56
  57     void dumpInContext(PrintStream&, DumpContext*) const;
  58     void dump(PrintStream&) const;
  59
  60 private:
  61     JSCell* m_constant;
  62     Structure* m_structure;
  63 };
  64
  65 typedef Vector<ConstantStructureCheck, 2> ConstantStructureCheckVector;
  66
  67 Structure* structureFor(const ConstantStructureCheckVector& vector, JSCell* constant);
  68 bool areCompatible(const ConstantStructureCheckVector&, const ConstantStructureCheckVector&);
  69 void mergeInto(const ConstantStructureCheckVector& source, ConstantStructureCheckVector& target);
  70
  71 } // namespace JSC
  72
  73 #endif // ConstantStructureCheck_h
  74