| /* |
| * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.graph; |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| |
| class NodeUsageIterator implements Iterator<Node> { |
| |
| final Node node; |
| int index = -1; |
| Node current; |
| |
| void advance() { |
| current = null; |
| index++; |
| if (index == 0) { |
| current = node.usage0; |
| } else if (index == 1) { |
| current = node.usage1; |
| } else { |
| int relativeIndex = index - Node.INLINE_USAGE_COUNT; |
| if (relativeIndex < node.extraUsagesCount) { |
| current = node.extraUsages[relativeIndex]; |
| } |
| } |
| } |
| |
| NodeUsageIterator(Node node) { |
| this.node = node; |
| advance(); |
| } |
| |
| @Override |
| public boolean hasNext() { |
| return current != null; |
| } |
| |
| @Override |
| public Node next() { |
| Node result = current; |
| if (result == null) { |
| throw new NoSuchElementException(); |
| } |
| advance(); |
| return result; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |