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 package org.graalvm.compiler.lir.constopt; 24 25 import java.util.ArrayList; 26 import java.util.List; 27 import java.util.function.Consumer; 28 29 import org.graalvm.compiler.core.common.cfg.AbstractBlockBase; 30 import org.graalvm.compiler.lir.LIRInstruction; 31 import org.graalvm.compiler.lir.StandardOp.LoadConstantOp; 32 import org.graalvm.compiler.lir.Variable; 33 34 import jdk.vm.ci.meta.Constant; 35 import jdk.vm.ci.meta.Value; 36 37 /** 38 * Represents def-use tree of a constant. 39 */ 40 class DefUseTree { 41 private final LoadConstantOp instruction; 42 private final AbstractBlockBase<?> block; 43 private final List<UseEntry> uses; 44 45 DefUseTree(LIRInstruction instruction, AbstractBlockBase<?> block) { 46 assert instruction instanceof LoadConstantOp : "Not a LoadConstantOp: " + instruction; 47 this.instruction = (LoadConstantOp) instruction; 48 this.block = block; 49 this.uses = new ArrayList<>(); 50 } 51 52 public Variable getVariable() { 53 return (Variable) instruction.getResult(); 54 } 55 56 public Constant getConstant() { 57 return instruction.getConstant(); 58 } 59 60 public LIRInstruction getInstruction() { 61 return (LIRInstruction) instruction; 62 } 63 64 public AbstractBlockBase<?> getBlock() { 65 return block; 66 } 67 68 @Override 69 public String toString() { 70 return "DefUseTree [" + instruction + "|" + block + "," + uses + "]"; 71 } 72 73 public void addUsage(AbstractBlockBase<?> b, LIRInstruction inst, Value value) { 74 uses.add(new UseEntry(b, inst, value)); 75 } 76 77 public int usageCount() { 78 return uses.size(); 79 } 80 81 public void forEach(Consumer<? super UseEntry> action) { 82 uses.forEach(action); 83 } 84 85 }