| /* |
| * Copyright (c) 2009, 2015, 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.nodes; |
| |
| import org.graalvm.compiler.graph.NodeClass; |
| import org.graalvm.compiler.nodeinfo.NodeInfo; |
| |
| /** |
| * Denotes the merging of multiple control-flow paths. |
| */ |
| @NodeInfo |
| public final class MergeNode extends AbstractMergeNode { |
| |
| public static final NodeClass<MergeNode> TYPE = NodeClass.create(MergeNode.class); |
| |
| public MergeNode() { |
| super(TYPE); |
| } |
| |
| public static void removeMergeIfDegenerated(MergeNode node) { |
| if (node.forwardEndCount() == 1 && node.hasNoUsages()) { |
| FixedNode currentNext = node.next(); |
| node.setNext(null); |
| EndNode forwardEnd = node.forwardEndAt(0); |
| forwardEnd.replaceAtPredecessor(currentNext); |
| node.markDeleted(); |
| forwardEnd.markDeleted(); |
| } |
| } |
| |
| @Override |
| public boolean verify() { |
| assertTrue(this.forwardEndCount() > 1, "Must merge more than one end."); |
| return true; |
| } |
| } |
