bytecode/CallLinkInfo.cpp

   1 /*
   2  * Copyright (C) 2012 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 "CallLinkInfo.h"
  28
  29 #include "DFGOperations.h"
  30 #include "DFGThunks.h"
  31 #include "RepatchBuffer.h"
  32
  33 #if ENABLE(JIT)
  34 namespace JSC {
  35
  36 void CallLinkInfo::unlink(VM& vm, RepatchBuffer& repatchBuffer)
  37 {
  38     ASSERT(isLinked());
  39
  40     repatchBuffer.revertJumpReplacementToBranchPtrWithPatch(RepatchBuffer::startOfBranchPtrWithPatchOnRegister(hotPathBegin), static_cast<MacroAssembler::RegisterID>(calleeGPR), 0);
  41     if (isDFG) {
  42 #if ENABLE(DFG_JIT)
  43         repatchBuffer.relink(callReturnLocation, (callType == Construct ? vm.getCTIStub(DFG::linkConstructThunkGenerator) : vm.getCTIStub(DFG::linkCallThunkGenerator)).code());
  44 #else
  45         RELEASE_ASSERT_NOT_REACHED();
  46 #endif
  47     } else
  48         repatchBuffer.relink(callReturnLocation, callType == Construct ? vm.getCTIStub(linkConstructGenerator).code() : vm.getCTIStub(linkCallGenerator).code());
  49     hasSeenShouldRepatch = false;
  50     callee.clear();
  51     stub.clear();
  52
  53     // It will be on a list if the callee has a code block.
  54     if (isOnList())
  55         remove();
  56 }
  57
  58 } // namespace JSC
  59 #endif // ENABLE(JIT)
  60