1 /* 2 * Copyright (c) 2014, 2015, 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.constopt; 26 27 import java.util.ArrayList; 28 import java.util.List; 29 import java.util.function.Consumer; 30 31 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase; 32 import org.graalvm.compiler.lir.LIRInstruction; 33 import org.graalvm.compiler.lir.StandardOp.LoadConstantOp; 34 import org.graalvm.compiler.lir.Variable; 35 36 import jdk.vm.ci.meta.Constant; 37 import jdk.vm.ci.meta.Value; 38 39 /** 40 * Represents def-use tree of a constant. 41 */ 42 class DefUseTree { 43 private final LoadConstantOp instruction; 44 private final AbstractBlockBase<?> block; 45 private final List<UseEntry> uses; 46 DefUseTree(LIRInstruction instruction, AbstractBlockBase<?> block)47 DefUseTree(LIRInstruction instruction, AbstractBlockBase<?> block) { 48 assert LoadConstantOp.isLoadConstantOp(instruction) : "Not a LoadConstantOp: " + instruction; 49 this.instruction = LoadConstantOp.asLoadConstantOp(instruction); 50 this.block = block; 51 this.uses = new ArrayList<>(); 52 } 53 getVariable()54 public Variable getVariable() { 55 return (Variable) instruction.getResult(); 56 } 57 getConstant()58 public Constant getConstant() { 59 return instruction.getConstant(); 60 } 61 getInstruction()62 public LIRInstruction getInstruction() { 63 return (LIRInstruction) instruction; 64 } 65 getBlock()66 public AbstractBlockBase<?> getBlock() { 67 return block; 68 } 69 70 @Override toString()71 public String toString() { 72 return "DefUseTree [" + instruction + "|" + block + "," + uses + "]"; 73 } 74 addUsage(AbstractBlockBase<?> b, LIRInstruction inst, Value value)75 public void addUsage(AbstractBlockBase<?> b, LIRInstruction inst, Value value) { 76 uses.add(new UseEntry(b, inst, value)); 77 } 78 usageCount()79 public int usageCount() { 80 return uses.size(); 81 } 82 forEach(Consumer<? super UseEntry> action)83 public void forEach(Consumer<? super UseEntry> action) { 84 uses.forEach(action); 85 } 86 87 } 88