1/* 2 * Copyright (c) 2014, 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 */ 23package org.graalvm.compiler.graph; 24 25import static org.graalvm.compiler.graph.Graph.isModificationCountsEnabled; 26 27import java.util.Iterator; 28 29import org.graalvm.compiler.graph.iterators.NodeIterable; 30 31class NodeUsageIterable implements NodeIterable<Node> { 32 33 private final Node node; 34 35 NodeUsageIterable(Node node) { 36 this.node = node; 37 } 38 39 @Override 40 public NodeUsageIterator iterator() { 41 if (isModificationCountsEnabled()) { 42 return new NodeUsageWithModCountIterator(node); 43 } else { 44 return new NodeUsageIterator(node); 45 } 46 } 47 48 @Override 49 public Node first() { 50 return node.usage0; 51 } 52 53 @Override 54 public boolean isEmpty() { 55 return node.usage0 == null; 56 } 57 58 @Override 59 public boolean isNotEmpty() { 60 return node.usage0 != null; 61 } 62 63 @Override 64 public int count() { 65 return node.getUsageCount(); 66 } 67 68 @Override 69 public String toString() { 70 StringBuilder sb = new StringBuilder(); 71 Iterator<Node> iterator = iterator(); 72 boolean first = true; 73 sb.append("usages="); 74 sb.append('['); 75 while (iterator.hasNext()) { 76 Node input = iterator.next(); 77 if (!first) { 78 sb.append(", "); 79 } 80 sb.append(input); 81 first = false; 82 } 83 sb.append(']'); 84 return sb.toString(); 85 } 86} 87