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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/BeginNode.java @ 8536:2978a819763b

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CheckCastSnippets: anchor UnsafeCast with subclass tests
author Bernhard Urban <bernhard.urban@jku.at>
date Wed, 27 Mar 2013 19:11:30 +0100
parents 21bf57680185
children 653110156f8a
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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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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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34 public class BeginNode extends FixedWithNextNode implements StateSplit, LIRLowerable, Simplifiable, Node.IterableNodeType {
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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 }
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144
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145 public NodeIterable<FixedNode> getBlockNodes() {
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146 return new AbstractNodeIterable<FixedNode>() {
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147
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148 @Override
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149 public Iterator<FixedNode> iterator() {
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150 return new BlockNodeIterator(BeginNode.this);
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151 }
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152 };
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153 }
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154
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155 private class BlockNodeIterator implements Iterator<FixedNode> {
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156
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157 private FixedNode current;
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158
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159 public BlockNodeIterator(FixedNode next) {
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160 this.current = next;
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161 }
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162
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163 @Override
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164 public boolean hasNext() {
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165 return current != null;
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166 }
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167
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168 @Override
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169 public FixedNode next() {
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170 FixedNode ret = current;
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171 if (ret == null) {
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172 throw new NoSuchElementException();
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173 }
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174 if (!(current instanceof FixedWithNextNode) || (current instanceof BeginNode && current != BeginNode.this)) {
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175 current = null;
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176 } else {
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177 current = ((FixedWithNextNode) current).next();
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178 }
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179 return ret;
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180 }
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181
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182 @Override
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183 public void remove() {
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184 throw new UnsupportedOperationException();
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185 }
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186 }
8536
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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 }