1 /* 2 * Copyright (c) 2009, 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.nodes; 26 27 import org.graalvm.compiler.core.common.type.Stamp; 28 import org.graalvm.compiler.graph.IterableNodeType; 29 import org.graalvm.compiler.graph.NodeClass; 30 import org.graalvm.compiler.nodeinfo.NodeInfo; 31 32 /** 33 * The {@code ControlSplitNode} is a base class for all instructions that split the control flow 34 * (ie. have more than one successor). 35 */ 36 @NodeInfo 37 public abstract class ControlSplitNode extends FixedNode implements IterableNodeType { 38 public static final NodeClass<ControlSplitNode> TYPE = NodeClass.create(ControlSplitNode.class); 39 40 protected ControlSplitNode(NodeClass<? extends ControlSplitNode> c, Stamp stamp) { 41 super(c, stamp); 42 } 43 44 public abstract double probability(AbstractBeginNode successor); 45 46 /** 47 * Attempts to set the probability for the given successor to the passed value (which has to be 48 * in the range of 0.0 and 1.0). Returns whether setting the probability was successful. 49 */ 50 public abstract boolean setProbability(AbstractBeginNode successor, double value); 51 52 /** 53 * Primary successor of the control split. Data dependencies on the node have to be scheduled in 54 * the primary successor. Returns null if data dependencies are not expected. 55 * 56 * @return the primary successor 57 */ 58 public abstract AbstractBeginNode getPrimarySuccessor(); 59 60 /** 61 * Returns the number of successors. 62 */ 63 public abstract int getSuccessorCount(); 64 }