bytecode/PutByIdStatus.h

   1 /*
   2  * Copyright (C) 2012, 2013, 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 PutByIdStatus_h
  27 #define PutByIdStatus_h
  28
  29 #include "CallLinkStatus.h"
  30 #include "ExitingJITType.h"
  31 #include "PutByIdVariant.h"
  32 #include "StructureStubInfo.h"
  33 #include <wtf/text/StringImpl.h>
  34
  35 namespace JSC {
  36
  37 class CodeBlock;
  38 class VM;
  39 class JSGlobalObject;
  40 class Structure;
  41 class StructureChain;
  42
  43 class PutByIdStatus {
  44 public:
  45     enum State {
  46         // It's uncached so we have no information.
  47         NoInformation,
  48         // It's cached as a simple store of some kind.
  49         Simple,
  50         // It's known to often take slow path.
  51         TakesSlowPath,
  52         // It's known to take paths that make calls.
  53         MakesCalls
  54     };
  55
  56     PutByIdStatus()
  57         : m_state(NoInformation)
  58     {
  59     }
  60
  61     explicit PutByIdStatus(State state)
  62         : m_state(state)
  63     {
  64         ASSERT(m_state == NoInformation || m_state == TakesSlowPath || m_state == MakesCalls);
  65     }
  66
  67     PutByIdStatus(const PutByIdVariant& variant)
  68         : m_state(Simple)
  69     {
  70         m_variants.append(variant);
  71     }
  72
  73     static PutByIdStatus computeFor(CodeBlock*, StubInfoMap&, unsigned bytecodeIndex, UniquedStringImpl* uid);
  74     static PutByIdStatus computeFor(JSGlobalObject*, const StructureSet&, UniquedStringImpl* uid, bool isDirect);
  75
  76     static PutByIdStatus computeFor(CodeBlock* baselineBlock, CodeBlock* dfgBlock, StubInfoMap& baselineMap, StubInfoMap& dfgMap, CodeOrigin, UniquedStringImpl* uid);
  77
  78     State state() const { return m_state; }
  79
  80     bool isSet() const { return m_state != NoInformation; }
  81     bool operator!() const { return m_state == NoInformation; }
  82     bool isSimple() const { return m_state == Simple; }
  83     bool takesSlowPath() const { return m_state == TakesSlowPath || m_state == MakesCalls; }
  84     bool makesCalls() const;
  85
  86     size_t numVariants() const { return m_variants.size(); }
  87     const Vector<PutByIdVariant, 1>& variants() const { return m_variants; }
  88     const PutByIdVariant& at(size_t index) const { return m_variants[index]; }
  89     const PutByIdVariant& operator[](size_t index) const { return at(index); }
  90
  91     void dump(PrintStream&) const;
  92
  93 private:
  94 #if ENABLE(DFG_JIT)
  95     static bool hasExitSite(const ConcurrentJITLocker&, CodeBlock*, unsigned bytecodeIndex);
  96 #endif
  97 #if ENABLE(JIT)
  98     static PutByIdStatus computeForStubInfo(
  99         const ConcurrentJITLocker&, CodeBlock*, StructureStubInfo*, UniquedStringImpl* uid,
 100         CallLinkStatus::ExitSiteData);
 101 #endif
 102     static PutByIdStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex, UniquedStringImpl* uid);
 103
 104     bool appendVariant(const PutByIdVariant&);
 105
 106     State m_state;
 107     Vector<PutByIdVariant, 1> m_variants;
 108 };
 109
 110 } // namespace JSC
 111
 112 #endif // PutByIdStatus_h
 113