Mercurial > hg > graal-jvmci-8
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/BeginNode.java @ 8536:2978a819763b
CheckCastSnippets: anchor UnsafeCast with subclass tests
author | Bernhard Urban <bernhard.urban@jku.at> |
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date | Wed, 27 Mar 2013 19:11:30 +0100 |
parents | 21bf57680185 |
children | 653110156f8a |
rev | line source |
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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 static com.oracle.graal.graph.iterators.NodePredicates.*; |
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26 |
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27 import java.util.*; |
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28 |
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29 import com.oracle.graal.graph.*; |
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30 import com.oracle.graal.graph.iterators.*; |
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31 import com.oracle.graal.nodes.spi.*; |
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32 import com.oracle.graal.nodes.type.*; |
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33 |
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34 public class BeginNode extends FixedWithNextNode implements StateSplit, LIRLowerable, Simplifiable, Node.IterableNodeType { |
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35 |
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36 @Input(notDataflow = true) private FrameState stateAfter; |
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37 |
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38 public FrameState stateAfter() { |
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39 return stateAfter; |
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40 } |
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41 |
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42 public void setStateAfter(FrameState x) { |
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43 assert x == null || x.isAlive() : "frame state must be in a graph"; |
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44 updateUsages(stateAfter, x); |
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45 stateAfter = x; |
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46 } |
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47 |
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48 public boolean hasSideEffect() { |
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49 return false; |
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50 } |
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51 |
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52 public BeginNode() { |
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53 super(StampFactory.dependency()); |
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54 } |
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55 |
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56 protected BeginNode(Stamp stamp) { |
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57 super(stamp); |
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58 } |
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59 |
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60 public static BeginNode begin(FixedNode with) { |
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61 if (with instanceof BeginNode) { |
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62 return (BeginNode) with; |
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63 } |
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64 BeginNode begin = with.graph().add(new BeginNode()); |
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65 begin.setNext(with); |
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66 return begin; |
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67 } |
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68 |
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69 @Override |
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70 public void simplify(SimplifierTool tool) { |
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71 FixedNode prev = (FixedNode) this.predecessor(); |
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72 if (prev == null) { |
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73 // This is the start node. |
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74 } else if (prev instanceof ControlSplitNode) { |
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75 // This begin node is necessary. |
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76 } else { |
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77 // This begin node can be removed and all guards moved up to the preceding begin node. |
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78 prepareDelete(); |
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79 tool.addToWorkList(next()); |
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80 ((StructuredGraph) graph()).removeFixed(this); |
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81 } |
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82 } |
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83 |
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84 public static BeginNode prevBegin(FixedNode from) { |
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85 Node prevBegin = from; |
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86 while (prevBegin != null) { |
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87 if (prevBegin instanceof BeginNode) { |
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88 return (BeginNode) prevBegin; |
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89 } |
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90 prevBegin = prevBegin.predecessor(); |
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91 } |
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92 return null; |
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93 } |
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94 |
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95 private void evacuateGuards(FixedNode evacuateFrom) { |
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96 if (!usages().isEmpty()) { |
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97 BeginNode prevBegin = prevBegin(evacuateFrom); |
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98 assert prevBegin != null; |
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99 for (Node anchored : anchored().snapshot()) { |
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100 anchored.replaceFirstInput(this, prevBegin); |
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101 } |
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102 } |
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103 } |
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104 |
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105 public void prepareDelete() { |
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106 prepareDelete((FixedNode) predecessor()); |
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107 } |
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108 |
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109 public void prepareDelete(FixedNode evacuateFrom) { |
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110 removeProxies(); |
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111 evacuateGuards(evacuateFrom); |
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112 } |
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113 |
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114 public void removeProxies() { |
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115 for (ProxyNode vpn : proxies().snapshot()) { |
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116 // can not use graph.replaceFloating because vpn.value may be null during killCFG |
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117 vpn.replaceAtUsages(vpn.value()); |
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118 vpn.safeDelete(); |
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119 } |
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120 } |
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121 |
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122 @Override |
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123 public boolean verify() { |
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124 assertTrue(predecessor() != null || this == ((StructuredGraph) graph()).start() || this instanceof MergeNode, "begin nodes must be connected"); |
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125 return super.verify(); |
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126 } |
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127 |
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128 @Override |
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129 public void generate(LIRGeneratorTool gen) { |
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130 // nop |
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131 } |
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132 |
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133 public NodeIterable<GuardNode> guards() { |
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134 return usages().filter(GuardNode.class); |
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135 } |
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136 |
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137 public NodeIterable<Node> anchored() { |
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138 return usages().filter(isNotA(ProxyNode.class)); |
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139 } |
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140 |
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141 public NodeIterable<ProxyNode> proxies() { |
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142 return usages().filter(ProxyNode.class); |
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143 } |
5214 | 144 |
145 public NodeIterable<FixedNode> getBlockNodes() { | |
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146 return new AbstractNodeIterable<FixedNode>() { |
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147 |
5214 | 148 @Override |
149 public Iterator<FixedNode> iterator() { | |
150 return new BlockNodeIterator(BeginNode.this); | |
151 } | |
152 }; | |
153 } | |
154 | |
155 private class BlockNodeIterator implements Iterator<FixedNode> { | |
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156 |
5214 | 157 private FixedNode current; |
158 | |
159 public BlockNodeIterator(FixedNode next) { | |
160 this.current = next; | |
161 } | |
162 | |
163 @Override | |
164 public boolean hasNext() { | |
165 return current != null; | |
166 } | |
167 | |
168 @Override | |
169 public FixedNode next() { | |
170 FixedNode ret = current; | |
171 if (ret == null) { | |
172 throw new NoSuchElementException(); | |
173 } | |
174 if (!(current instanceof FixedWithNextNode) || (current instanceof BeginNode && current != BeginNode.this)) { | |
175 current = null; | |
176 } else { | |
177 current = ((FixedWithNextNode) current).next(); | |
178 } | |
179 return ret; | |
180 } | |
181 | |
182 @Override | |
183 public void remove() { | |
184 throw new UnsupportedOperationException(); | |
185 } | |
186 } | |
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187 |
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188 @NodeIntrinsic |
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189 public static native <T> T anchor(@ConstantNodeParameter Stamp stamp); |
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190 } |