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annotate graal/com.oracle.max.graal.nodes/src/com/oracle/graal/nodes/BeginNode.java @ 5060:4ed4295ce15f

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Update import statements.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Thu, 08 Mar 2012 19:11:12 +0100
parents ed559a528128
children
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1 /*
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2 * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 */
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23 package com.oracle.graal.nodes;
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24
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25 import java.util.*;
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26
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27 import com.oracle.graal.graph.*;
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28 import com.oracle.graal.graph.iterators.*;
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29 import com.oracle.graal.nodes.spi.*;
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30 import com.oracle.graal.nodes.type.*;
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31
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32 public class BeginNode extends AbstractStateSplit implements LIRLowerable, Simplifiable, Node.IterableNodeType {
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33 public BeginNode() {
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34 super(StampFactory.illegal());
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35 }
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36
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37 public static BeginNode begin(FixedNode with) {
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38 if (with instanceof BeginNode) {
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39 return (BeginNode) with;
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40 }
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41 BeginNode begin = with.graph().add(new BeginNode());
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42 begin.setNext(with);
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43 return begin;
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44 }
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45
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46 @Override
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47 public Map<Object, Object> getDebugProperties() {
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48 Map<Object, Object> debugProperties = super.getDebugProperties();
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49 debugProperties.put("shortName", "B");
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50 return debugProperties;
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51 }
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52
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53 @Override
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54 public void simplify(SimplifierTool tool) {
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55 FixedNode prev = (FixedNode) this.predecessor();
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56 if (prev == null) {
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57 // This is the start node.
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58 } else if (prev instanceof ControlSplitNode) {
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59 // This begin node is necessary.
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60 } else {
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61 // This begin node can be removed and all guards moved up to the preceding begin node.
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62 if (!usages().isEmpty()) {
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63 Node prevBegin = prev;
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64 while (!(prevBegin instanceof BeginNode)) {
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65 prevBegin = prevBegin.predecessor();
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66 }
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67 for (Node usage : usages()) {
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68 tool.addToWorkList(usage);
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69 }
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70 replaceAtUsages(prevBegin);
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71 }
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72 ((StructuredGraph) graph()).removeFixed(this);
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73 }
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74 }
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75
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76 public void evacuateGuards() {
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77 if (!usages().isEmpty()) {
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78 Node prevBegin = predecessor();
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79 assert prevBegin != null;
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80 while (!(prevBegin instanceof BeginNode)) {
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81 prevBegin = prevBegin.predecessor();
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82 }
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83 replaceAtUsages(prevBegin);
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84 }
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85 }
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86
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87 @Override
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88 public boolean verify() {
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89 assertTrue(predecessor() != null || this == ((StructuredGraph) graph()).start() || this instanceof MergeNode, "begin nodes must be connected");
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90 return super.verify();
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91 }
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92
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93 @Override
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94 public void generate(LIRGeneratorTool gen) {
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95 // nop
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96 }
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97
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98 public NodeIterable<GuardNode> guards() {
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99 return usages().filter(GuardNode.class);
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100 }
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101 }