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 */ 23 package org.graalvm.compiler.graph; 24 25 import static org.graalvm.compiler.graph.Graph.isModificationCountsEnabled; 26 27 import org.graalvm.compiler.graph.iterators.NodeIterable; 28 29 class NodeUsageIterable implements NodeIterable<Node> { 30 31 private final Node node; 32 33 NodeUsageIterable(Node node) { 34 this.node = node; 35 } 36 37 @Override 38 public NodeUsageIterator iterator() { 39 if (isModificationCountsEnabled()) { 40 return new NodeUsageWithModCountIterator(node); 41 } else { 42 return new NodeUsageIterator(node); 43 } 44 } 45 46 @Override 47 public Node first() { 48 return node.usage0; 49 } 50 51 @Override 52 public boolean isEmpty() { 53 return node.usage0 == null; 54 } 55 56 @Override 57 public boolean isNotEmpty() { 58 return node.usage0 != null; 59 } 60 61 @Override 62 public int count() { 63 return node.getUsageCount(); 64 } 65 }