ftl/FTLExitThunkGenerator.cpp

   1 /*
   2  * Copyright (C) 2013 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 #include "config.h"
  27 #include "FTLExitThunkGenerator.h"
  28
  29 #if ENABLE(FTL_JIT)
  30
  31 #include "FTLOSRExitCompilationInfo.h"
  32 #include "FTLState.h"
  33
  34 namespace JSC { namespace FTL {
  35
  36 using namespace JSC::DFG;
  37
  38 ExitThunkGenerator::ExitThunkGenerator(State& state)
  39     : CCallHelpers(&state.graph.m_vm, state.graph.m_codeBlock)
  40     , m_state(state)
  41     , m_didThings(false)
  42 {
  43 }
  44
  45 ExitThunkGenerator::~ExitThunkGenerator()
  46 {
  47 }
  48
  49 void ExitThunkGenerator::emitThunk(unsigned index)
  50 {
  51     OSRExitCompilationInfo& info = m_state.finalizer->osrExit[index];
  52
  53     info.m_thunkLabel = label();
  54     pushToSaveImmediateWithoutTouchingRegisters(TrustedImm32(index));
  55     info.m_thunkJump = patchableJump();
  56
  57     m_didThings = true;
  58 }
  59
  60 void ExitThunkGenerator::emitThunks()
  61 {
  62     for (unsigned i = 0; i < m_state.finalizer->osrExit.size(); ++i)
  63         emitThunk(i);
  64 }
  65
  66 } } // namespace JSC::FTL
  67
  68 #endif // ENABLE(FTL_JIT)
  69