| /* |
| * Copyright (c) 2016, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| |
| package org.graalvm.compiler.lir.alloc; |
| |
| import java.util.ArrayList; |
| |
| import org.graalvm.compiler.core.common.LIRKind; |
| import org.graalvm.compiler.core.common.cfg.AbstractBlockBase; |
| import org.graalvm.compiler.lir.LIR; |
| import org.graalvm.compiler.lir.LIRInsertionBuffer; |
| import org.graalvm.compiler.lir.LIRInstruction; |
| import org.graalvm.compiler.lir.StandardOp; |
| import org.graalvm.compiler.lir.Variable; |
| import org.graalvm.compiler.lir.gen.LIRGenerationResult; |
| import org.graalvm.compiler.lir.gen.LIRGeneratorTool; |
| import org.graalvm.compiler.lir.phases.PreAllocationOptimizationPhase; |
| import org.graalvm.compiler.lir.util.RegisterMap; |
| |
| import jdk.vm.ci.code.Architecture; |
| import jdk.vm.ci.code.Register; |
| import jdk.vm.ci.code.RegisterArray; |
| import jdk.vm.ci.code.RegisterValue; |
| import jdk.vm.ci.code.TargetDescription; |
| import jdk.vm.ci.meta.PlatformKind; |
| |
| public class SaveCalleeSaveRegisters extends PreAllocationOptimizationPhase { |
| |
| @Override |
| protected void run(TargetDescription target, LIRGenerationResult lirGenRes, PreAllocationOptimizationContext context) { |
| RegisterArray calleeSaveRegisters = lirGenRes.getRegisterConfig().getCalleeSaveRegisters(); |
| if (calleeSaveRegisters == null || calleeSaveRegisters.size() == 0) { |
| return; |
| } |
| LIR lir = lirGenRes.getLIR(); |
| RegisterMap<Variable> savedRegisters = saveAtEntry(lir, context.lirGen, lirGenRes, calleeSaveRegisters, target.arch); |
| |
| for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) { |
| if (block == null) { |
| continue; |
| } |
| if (block.getSuccessorCount() == 0) { |
| restoreAtExit(lir, context.lirGen.getSpillMoveFactory(), lirGenRes, savedRegisters, block); |
| } |
| } |
| } |
| |
| private static RegisterMap<Variable> saveAtEntry(LIR lir, LIRGeneratorTool lirGen, LIRGenerationResult lirGenRes, RegisterArray calleeSaveRegisters, Architecture arch) { |
| AbstractBlockBase<?> startBlock = lir.getControlFlowGraph().getStartBlock(); |
| ArrayList<LIRInstruction> instructions = lir.getLIRforBlock(startBlock); |
| int insertionIndex = 1; |
| LIRInsertionBuffer buffer = new LIRInsertionBuffer(); |
| buffer.init(instructions); |
| StandardOp.LabelOp entry = (StandardOp.LabelOp) instructions.get(insertionIndex - 1); |
| RegisterValue[] savedRegisterValues = new RegisterValue[calleeSaveRegisters.size()]; |
| int savedRegisterValueIndex = 0; |
| RegisterMap<Variable> saveMap = new RegisterMap<>(arch); |
| for (Register register : calleeSaveRegisters) { |
| PlatformKind registerPlatformKind = arch.getLargestStorableKind(register.getRegisterCategory()); |
| LIRKind lirKind = LIRKind.value(registerPlatformKind); |
| RegisterValue registerValue = register.asValue(lirKind); |
| Variable saveVariable = lirGen.newVariable(lirKind); |
| LIRInstruction save = lirGen.getSpillMoveFactory().createMove(saveVariable, registerValue); |
| buffer.append(insertionIndex, save); |
| save.setComment(lirGenRes, "SaveCalleeSavedRegisters: saveAtEntry"); |
| saveMap.put(register, saveVariable); |
| savedRegisterValues[savedRegisterValueIndex++] = registerValue; |
| } |
| entry.addIncomingValues(savedRegisterValues); |
| buffer.finish(); |
| return saveMap; |
| } |
| |
| private static void restoreAtExit(LIR lir, LIRGeneratorTool.MoveFactory moveFactory, LIRGenerationResult lirGenRes, RegisterMap<Variable> calleeSaveRegisters, AbstractBlockBase<?> block) { |
| ArrayList<LIRInstruction> instructions = lir.getLIRforBlock(block); |
| int insertionIndex = instructions.size() - 1; |
| LIRInsertionBuffer buffer = new LIRInsertionBuffer(); |
| buffer.init(instructions); |
| assert instructions.get(insertionIndex) instanceof StandardOp.BlockEndOp; |
| calleeSaveRegisters.forEach((Register register, Variable saved) -> { |
| LIRInstruction restore = moveFactory.createMove(register.asValue(saved.getValueKind()), saved); |
| buffer.append(insertionIndex, restore); |
| restore.setComment(lirGenRes, "SaveCalleeSavedRegisters: restoreAtExit"); |
| }); |
| buffer.finish(); |
| } |
| } |