1 /* 2 * Copyright (c) 2012, 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.replacements.nodes; 24 25 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0; 26 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0; 27 28 import java.util.ArrayList; 29 30 import org.graalvm.compiler.api.replacements.Snippet.VarargsParameter; 31 import org.graalvm.compiler.core.common.type.StampFactory; 32 import org.graalvm.compiler.graph.Node; 33 import org.graalvm.compiler.graph.NodeClass; 34 import org.graalvm.compiler.nodeinfo.NodeInfo; 35 import org.graalvm.compiler.nodes.FixedWithNextNode; 36 import org.graalvm.compiler.nodes.LoopBeginNode; 37 38 /** 39 * Placeholder node to denote to snippet preparation that the following loop must be completely 40 * unrolled. 41 * 42 * @see VarargsParameter 43 */ 44 @NodeInfo(cycles = CYCLES_0, size = SIZE_0) 45 public final class ExplodeLoopNode extends FixedWithNextNode { 46 public static final NodeClass<ExplodeLoopNode> TYPE = NodeClass.create(ExplodeLoopNode.class); 47 48 public ExplodeLoopNode() { 49 super(TYPE, StampFactory.forVoid()); 50 } 51 52 public LoopBeginNode findLoopBegin() { 53 Node currentNext = next(); 54 ArrayList<Node> succs = new ArrayList<>(); 55 while (!(currentNext instanceof LoopBeginNode)) { 56 assert currentNext != null : "cannot find loop after " + this; 57 for (Node n : currentNext.cfgSuccessors()) { 58 succs.add(n); 59 } 60 if (succs.size() == 1) { 61 currentNext = succs.get(0); 62 } else { 63 return null; 64 } 65 } 66 return (LoopBeginNode) currentNext; 67 } 68 69 /** 70 * A call to this method must be placed immediately prior to the loop that is to be exploded. 71 */ 72 @NodeIntrinsic 73 public static native void explodeLoop(); 74 }