1 /* 2 * Copyright (c) 2016, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.lir.alloc; 26 27 import java.util.ArrayList; 28 29 import org.graalvm.compiler.core.common.LIRKind; 30 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase; 31 import org.graalvm.compiler.lir.LIR; 32 import org.graalvm.compiler.lir.LIRInsertionBuffer; 33 import org.graalvm.compiler.lir.LIRInstruction; 34 import org.graalvm.compiler.lir.StandardOp; 35 import org.graalvm.compiler.lir.Variable; 36 import org.graalvm.compiler.lir.gen.LIRGenerationResult; 37 import org.graalvm.compiler.lir.gen.LIRGeneratorTool; 38 import org.graalvm.compiler.lir.phases.PreAllocationOptimizationPhase; 39 import org.graalvm.compiler.lir.util.RegisterMap; 40 41 import jdk.vm.ci.code.Architecture; 42 import jdk.vm.ci.code.Register; 43 import jdk.vm.ci.code.RegisterArray; 44 import jdk.vm.ci.code.RegisterValue; 45 import jdk.vm.ci.code.TargetDescription; 46 import jdk.vm.ci.meta.PlatformKind; 47 48 public class SaveCalleeSaveRegisters extends PreAllocationOptimizationPhase { 49 50 @Override run(TargetDescription target, LIRGenerationResult lirGenRes, PreAllocationOptimizationContext context)51 protected void run(TargetDescription target, LIRGenerationResult lirGenRes, PreAllocationOptimizationContext context) { 52 RegisterArray calleeSaveRegisters = lirGenRes.getRegisterConfig().getCalleeSaveRegisters(); 53 if (calleeSaveRegisters == null || calleeSaveRegisters.size() == 0) { 54 return; 55 } 56 LIR lir = lirGenRes.getLIR(); 57 RegisterMap<Variable> savedRegisters = saveAtEntry(lir, context.lirGen, lirGenRes, calleeSaveRegisters, target.arch); 58 59 for (AbstractBlockBase<?> block : lir.codeEmittingOrder()) { 60 if (block == null) { 61 continue; 62 } 63 if (block.getSuccessorCount() == 0) { 64 restoreAtExit(lir, context.lirGen.getSpillMoveFactory(), lirGenRes, savedRegisters, block); 65 } 66 } 67 } 68 saveAtEntry(LIR lir, LIRGeneratorTool lirGen, LIRGenerationResult lirGenRes, RegisterArray calleeSaveRegisters, Architecture arch)69 private static RegisterMap<Variable> saveAtEntry(LIR lir, LIRGeneratorTool lirGen, LIRGenerationResult lirGenRes, RegisterArray calleeSaveRegisters, Architecture arch) { 70 AbstractBlockBase<?> startBlock = lir.getControlFlowGraph().getStartBlock(); 71 ArrayList<LIRInstruction> instructions = lir.getLIRforBlock(startBlock); 72 int insertionIndex = 1; 73 LIRInsertionBuffer buffer = new LIRInsertionBuffer(); 74 buffer.init(instructions); 75 StandardOp.LabelOp entry = (StandardOp.LabelOp) instructions.get(insertionIndex - 1); 76 RegisterValue[] savedRegisterValues = new RegisterValue[calleeSaveRegisters.size()]; 77 int savedRegisterValueIndex = 0; 78 RegisterMap<Variable> saveMap = new RegisterMap<>(arch); 79 for (Register register : calleeSaveRegisters) { 80 PlatformKind registerPlatformKind = arch.getLargestStorableKind(register.getRegisterCategory()); 81 LIRKind lirKind = LIRKind.value(registerPlatformKind); 82 RegisterValue registerValue = register.asValue(lirKind); 83 Variable saveVariable = lirGen.newVariable(lirKind); 84 LIRInstruction save = lirGen.getSpillMoveFactory().createMove(saveVariable, registerValue); 85 buffer.append(insertionIndex, save); 86 save.setComment(lirGenRes, "SaveCalleeSavedRegisters: saveAtEntry"); 87 saveMap.put(register, saveVariable); 88 savedRegisterValues[savedRegisterValueIndex++] = registerValue; 89 } 90 entry.addIncomingValues(savedRegisterValues); 91 buffer.finish(); 92 return saveMap; 93 } 94 restoreAtExit(LIR lir, LIRGeneratorTool.MoveFactory moveFactory, LIRGenerationResult lirGenRes, RegisterMap<Variable> calleeSaveRegisters, AbstractBlockBase<?> block)95 private static void restoreAtExit(LIR lir, LIRGeneratorTool.MoveFactory moveFactory, LIRGenerationResult lirGenRes, RegisterMap<Variable> calleeSaveRegisters, AbstractBlockBase<?> block) { 96 ArrayList<LIRInstruction> instructions = lir.getLIRforBlock(block); 97 int insertionIndex = instructions.size() - 1; 98 LIRInsertionBuffer buffer = new LIRInsertionBuffer(); 99 buffer.init(instructions); 100 assert instructions.get(insertionIndex) instanceof StandardOp.BlockEndOp; 101 calleeSaveRegisters.forEach((Register register, Variable saved) -> { 102 LIRInstruction restore = moveFactory.createMove(register.asValue(saved.getValueKind()), saved); 103 buffer.append(insertionIndex, restore); 104 restore.setComment(lirGenRes, "SaveCalleeSavedRegisters: restoreAtExit"); 105 }); 106 buffer.finish(); 107 } 108 } 109