1 /* 2 * Copyright (c) 2014, 2018, 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.graph; 26 27 import static org.graalvm.compiler.graph.Graph.isModificationCountsEnabled; 28 29 import java.util.Iterator; 30 31 import org.graalvm.compiler.graph.iterators.NodeIterable; 32 33 class NodeUsageIterable implements NodeIterable<Node> { 34 35 private final Node node; 36 37 NodeUsageIterable(Node node) { 38 this.node = node; 39 } 40 41 @Override 42 public NodeUsageIterator iterator() { 43 if (isModificationCountsEnabled()) { 44 return new NodeUsageWithModCountIterator(node); 45 } else { 46 return new NodeUsageIterator(node); 47 } 48 } 49 50 @Override 51 public Node first() { 52 return node.usage0; 53 } 54 55 @Override 56 public boolean isEmpty() { 57 return node.usage0 == null; 58 } 59 60 @Override 61 public boolean isNotEmpty() { 62 return node.usage0 != null; 63 } 64 65 @Override 66 public int count() { 67 return node.getUsageCount(); 68 } 69 70 @Override 71 public String toString() { 72 StringBuilder sb = new StringBuilder(); 73 Iterator<Node> iterator = iterator(); 74 boolean first = true; 75 sb.append("usages="); 76 sb.append('['); 77 while (iterator.hasNext()) { 78 Node input = iterator.next(); 79 if (!first) { 80 sb.append(", "); 81 } 82 sb.append(input); 83 first = false; 84 } 85 sb.append(']'); 86 return sb.toString(); 87 } 88 }