bytecode/GetByIdVariant.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 GetByIdVariant_h
  27 #define GetByIdVariant_h
  28
  29 #include "CallLinkStatus.h"
  30 #include "ConstantStructureCheck.h"
  31 #include "IntendedStructureChain.h"
  32 #include "JSCJSValue.h"
  33 #include "PropertyOffset.h"
  34 #include "StructureSet.h"
  35
  36 namespace JSC {
  37
  38 class CallLinkStatus;
  39 class GetByIdStatus;
  40 struct DumpContext;
  41
  42 class GetByIdVariant {
  43 public:
  44     GetByIdVariant(
  45         const StructureSet& structureSet = StructureSet(), PropertyOffset offset = invalidOffset,
  46         const IntendedStructureChain* chain = nullptr,
  47         std::unique_ptr<CallLinkStatus> callLinkStatus = nullptr);
  48
  49     ~GetByIdVariant();
  50
  51     GetByIdVariant(const GetByIdVariant&);
  52     GetByIdVariant& operator=(const GetByIdVariant&);
  53
  54     bool isSet() const { return !!m_structureSet.size(); }
  55     bool operator!() const { return !isSet(); }
  56     const StructureSet& structureSet() const { return m_structureSet; }
  57     StructureSet& structureSet() { return m_structureSet; }
  58     const ConstantStructureCheckVector& constantChecks() const { return m_constantChecks; }
  59     JSObject* alternateBase() const { return m_alternateBase; }
  60     StructureSet baseStructure() const;
  61     PropertyOffset offset() const { return m_offset; }
  62     CallLinkStatus* callLinkStatus() const { return m_callLinkStatus.get(); }
  63
  64     bool attemptToMerge(const GetByIdVariant& other);
  65
  66     void dump(PrintStream&) const;
  67     void dumpInContext(PrintStream&, DumpContext*) const;
  68
  69 private:
  70     friend class GetByIdStatus;
  71
  72     StructureSet m_structureSet;
  73     ConstantStructureCheckVector m_constantChecks;
  74     JSObject* m_alternateBase;
  75     PropertyOffset m_offset;
  76     std::unique_ptr<CallLinkStatus> m_callLinkStatus;
  77 };
  78
  79 } // namespace JSC
  80
  81 #endif // GetByIdVariant_h
  82