PPCOutOfLineCodeSection.cpp

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 * Copyright (c) 2000, 2019 IBM Corp. and others
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 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at http://eclipse.org/legal/epl-2.0
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 * and is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
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 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
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#include "p/codegen/PPCOutOfLineCodeSection.hpp"

#include <stddef.h>
#include "codegen/CodeGenerator.hpp"
#include "codegen/Instruction.hpp"
#include "codegen/Machine.hpp"
#include "codegen/TreeEvaluator.hpp"
#include "compile/Compilation.hpp"
#include "env/TRMemory.hpp"
#include "il/ILOps.hpp"
#include "il/LabelSymbol.hpp"
#include "il/Node.hpp"
#include "infra/Assert.hpp"
#include "p/codegen/GenerateInstructions.hpp"
#include "p/codegen/PPCInstruction.hpp"

namespace TR { class RegisterDependencyConditions; }

TR_PPCOutOfLineCodeSection::TR_PPCOutOfLineCodeSection(TR::Node  *callNode,
                            TR::ILOpCodes      callOp,
                            TR::Register      *targetReg,
                            TR::LabelSymbol    *entryLabel,
                            TR::LabelSymbol    *restartLabel,
                            TR::CodeGenerator *cg) :
                            TR_OutOfLineCodeSection(callNode,callOp,targetReg,entryLabel,restartLabel,cg)
   {
   if(callNode->isPreparedForDirectJNI())
      {
      _callNode->setPreparedForDirectJNI();
      }

   generatePPCOutOfLineCodeSectionDispatch();
   }

void TR_PPCOutOfLineCodeSection::generatePPCOutOfLineCodeSectionDispatch()
   {
   // Switch to cold helper instruction stream.
   //
   swapInstructionListsWithCompilation();

   new (_cg->trHeapMemory()) TR::PPCLabelInstruction(TR::InstOpCode::label, _callNode, _entryLabel, _cg);

   TR::Register *resultReg = NULL;
   if (_callNode->getOpCode().isCallIndirect())
      resultReg = TR::TreeEvaluator::performCall(_callNode, true, _cg);
   else
      resultReg = TR::TreeEvaluator::performCall(_callNode, false, _cg);

   if (_targetReg)
      {
      TR_ASSERT(resultReg, "assertion failure");
      generateTrg1Src1Instruction(_cg, TR::InstOpCode::mr, _callNode, _targetReg, resultReg);
      }
   _cg->decReferenceCount(_callNode);

   if (_restartLabel)
      generateLabelInstruction(_cg, TR::InstOpCode::b, _callNode, _restartLabel);

   generateLabelInstruction(_cg, TR::InstOpCode::label, _callNode, TR::LabelSymbol::create(_cg->trHeapMemory(),_cg));

   // Switch from cold helper instruction stream.
   //
   swapInstructionListsWithCompilation();
   }