1 /*
2  * Copyright (c) 2012, 2016, 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
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22  */
23 
24 
25 package org.graalvm.compiler.nodes;
26 
27 import static org.graalvm.compiler.nodeinfo.InputType.Memory;
28 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_0;
29 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_0;
30 
31 import org.graalvm.compiler.graph.NodeClass;
32 import org.graalvm.compiler.nodeinfo.NodeInfo;
33 import org.graalvm.compiler.nodes.memory.MemoryCheckpoint;
34 import jdk.internal.vm.compiler.word.LocationIdentity;
35 
36 /**
37  * The start node of a graph.
38  */
39 @NodeInfo(allowedUsageTypes = {Memory}, nameTemplate = "Start", cycles = CYCLES_0, size = SIZE_0)
40 public class StartNode extends BeginStateSplitNode implements MemoryCheckpoint.Single {
41     public static final NodeClass<StartNode> TYPE = NodeClass.create(StartNode.class);
42 
StartNode(NodeClass<? extends StartNode> c)43     protected StartNode(NodeClass<? extends StartNode> c) {
44         super(c);
45     }
46 
StartNode()47     public StartNode() {
48         super(TYPE);
49     }
50 
51     @Override
getLocationIdentity()52     public LocationIdentity getLocationIdentity() {
53         return LocationIdentity.any();
54     }
55 }
56