1 /* 2 * Copyright (c) 2012, 2015, 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.nodes; 24 25 import org.graalvm.compiler.graph.Node; 26 import org.graalvm.compiler.graph.NodeClass; 27 import org.graalvm.compiler.nodeinfo.InputType; 28 import org.graalvm.compiler.nodeinfo.NodeInfo; 29 30 /** 31 * Base class for nodes that contain "virtual" state, like FrameState and VirtualObjectState. 32 * Subclasses of this class will be treated in a special way by the scheduler. 33 */ 34 @NodeInfo(allowedUsageTypes = {InputType.State}) 35 public abstract class VirtualState extends Node { 36 37 protected VirtualState(NodeClass<? extends VirtualState> c) { 38 super(c); 39 } 40 41 public static final NodeClass<VirtualState> TYPE = NodeClass.create(VirtualState.class); 42 43 public abstract static class NodeClosure<T extends Node> { 44 45 public abstract void apply(Node usage, T node); 46 } 47 48 public interface VirtualClosure { 49 50 void apply(VirtualState node); 51 } 52 53 public abstract VirtualState duplicateWithVirtualState(); 54 55 public abstract void applyToNonVirtual(NodeClosure<? super ValueNode> closure); 56 57 /** 58 * Performs a <b>pre-order</b> iteration over all elements reachable from this state that are a 59 * subclass of {@link VirtualState}. 60 */ 61 public abstract void applyToVirtual(VirtualClosure closure); 62 63 public abstract boolean isPartOfThisState(VirtualState state); 64 65 @Override 66 public final StructuredGraph graph() { 67 return (StructuredGraph) super.graph(); 68 } 69 70 }