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