1 /* 2 * Copyright (c) 2015, 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 package org.graalvm.compiler.lir.alloc.trace; 24 25 import static org.graalvm.compiler.lir.LIRValueUtil.asVariable; 26 import static org.graalvm.compiler.lir.LIRValueUtil.isConstantValue; 27 import static org.graalvm.compiler.lir.LIRValueUtil.isVariable; 28 import static org.graalvm.compiler.lir.alloc.trace.TraceUtil.isTrivialTrace; 29 30 import java.util.List; 31 32 import org.graalvm.compiler.core.common.alloc.Trace; 33 import org.graalvm.compiler.core.common.alloc.TraceBuilderResult; 34 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase; 35 import org.graalvm.compiler.lir.LIR; 36 import org.graalvm.compiler.lir.LIRInstruction; 37 import org.graalvm.compiler.lir.LIRInstruction.OperandFlag; 38 import org.graalvm.compiler.lir.StandardOp.JumpOp; 39 import org.graalvm.compiler.lir.StandardOp.LabelOp; 40 import org.graalvm.compiler.lir.ValueProcedure; 41 import org.graalvm.compiler.lir.Variable; 42 import org.graalvm.compiler.lir.gen.LIRGenerationResult; 43 import org.graalvm.compiler.lir.ssi.SSIUtil; 44 import org.graalvm.compiler.lir.util.VariableVirtualStackValueMap; 45 46 import jdk.vm.ci.code.TargetDescription; 47 import jdk.vm.ci.meta.Value; 48 49 /** 50 * Allocates a trivial trace i.e. a trace consisting of a single block with no instructions other 51 * than the {@link LabelOp} and the {@link JumpOp}. 52 */ 53 final class TrivialTraceAllocator extends TraceAllocationPhase<TraceAllocationPhase.TraceAllocationContext> { 54 55 @Override 56 protected void run(TargetDescription target, LIRGenerationResult lirGenRes, Trace trace, TraceAllocationContext context) { 57 LIR lir = lirGenRes.getLIR(); 58 TraceBuilderResult resultTraces = context.resultTraces; 59 assert isTrivialTrace(lir, trace) : "Not a trivial trace! " + trace; 60 AbstractBlockBase<?> block = trace.getBlocks()[0]; 61 62 AbstractBlockBase<?> pred = TraceUtil.getBestTraceInterPredecessor(resultTraces, block); 63 64 VariableVirtualStackValueMap<Variable, Value> variableMap = new VariableVirtualStackValueMap<>(lir.numVariables(), 0); 65 SSIUtil.forEachValuePair(lir, block, pred, (to, from) -> { 66 if (isVariable(to)) { 67 variableMap.put(asVariable(to), from); 68 } 69 }); 70 71 ValueProcedure outputConsumer = (value, mode, flags) -> { 72 if (isVariable(value)) { 73 Value incomingValue = variableMap.get(asVariable(value)); 74 assert !flags.contains(OperandFlag.COMPOSITE); 75 assert !(SSIUtil.incoming(lir, block).isPhiIn() && isConstantValue(incomingValue)) : "Phi variable cannot be constant: " + incomingValue + " -> " + value; 76 return incomingValue; 77 } 78 return value; 79 }; 80 81 List<LIRInstruction> instructions = lir.getLIRforBlock(block); 82 for (LIRInstruction op : instructions) { 83 84 op.forEachOutput(outputConsumer); 85 op.forEachTemp(outputConsumer); 86 op.forEachAlive(outputConsumer); 87 op.forEachInput(outputConsumer); 88 op.forEachState(outputConsumer); 89 } 90 } 91 }