dfg/DFGOSRExitCompiler.h

   1 /*
   2  * Copyright (C) 2011 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 DFGOSRExitCompiler_h
  27 #define DFGOSRExitCompiler_h
  28
  29 #include <wtf/Platform.h>
  30
  31 #if ENABLE(DFG_JIT)
  32
  33 #include "DFGAssemblyHelpers.h"
  34 #include "DFGOSRExit.h"
  35 #include "DFGOperations.h"
  36
  37 namespace JSC {
  38
  39 class ExecState;
  40
  41 namespace DFG {
  42
  43 class OSRExitCompiler {
  44 public:
  45     OSRExitCompiler(AssemblyHelpers& jit)
  46         : m_jit(jit)
  47     {
  48     }
  49
  50     void compileExit(const OSRExit&, SpeculationRecovery*);
  51
  52 private:
  53 #if !ASSERT_DISABLED
  54     static unsigned badIndex() { return static_cast<unsigned>(-1); };
  55 #endif
  56
  57     void initializePoisoned(unsigned size)
  58     {
  59 #if ASSERT_DISABLED
  60         m_poisonScratchIndices.resize(size);
  61 #else
  62         m_poisonScratchIndices.fill(badIndex(), size);
  63 #endif
  64     }
  65
  66     unsigned poisonIndex(unsigned index)
  67     {
  68         unsigned result = m_poisonScratchIndices[index];
  69         ASSERT(result != badIndex());
  70         return result;
  71     }
  72
  73     void handleExitCounts(const OSRExit&);
  74
  75     AssemblyHelpers& m_jit;
  76     Vector<unsigned> m_poisonScratchIndices;
  77 };
  78
  79 extern "C" {
  80 void DFG_OPERATION compileOSRExit(ExecState*);
  81 }
  82
  83 } } // namespace JSC::DFG
  84
  85 #endif // ENABLE(DFG_JIT)
  86
  87 #endif // DFGOSRExitCompiler_h