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