Mercurial > hg > truffle
annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/SwitchNode.java @ 15193:96bb07a5d667
Spit up and move GraalInternalError.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Thu, 17 Apr 2014 15:18:41 +0200 |
parents | df2ef5204f2b |
children | 882f4cb7cfcf |
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1 /* |
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2 * Copyright (c) 2009, 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.extended; |
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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.api.meta.*; |
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28 import com.oracle.graal.compiler.common.*; |
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29 import com.oracle.graal.graph.*; |
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30 import com.oracle.graal.nodes.*; |
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31 import com.oracle.graal.nodes.type.*; |
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32 |
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33 /** |
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34 * The {@code SwitchNode} class is the base of both lookup and table switches. |
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35 */ |
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36 public abstract class SwitchNode extends ControlSplitNode { |
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37 |
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38 @Successor private final NodeSuccessorList<BeginNode> successors; |
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39 @Input private ValueNode value; |
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40 private double[] keyProbabilities; |
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41 private int[] keySuccessors; |
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42 |
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43 /** |
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44 * Constructs a new Switch. |
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45 * |
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46 * @param value the instruction that provides the value to be switched over |
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47 * @param successors the list of successors of this switch |
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48 */ |
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49 public SwitchNode(ValueNode value, BeginNode[] successors, int[] keySuccessors, double[] keyProbabilities) { |
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50 super(StampFactory.forVoid()); |
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51 assert value.getKind() == Kind.Int || value.getKind() == Kind.Long || value.getKind() == Kind.Object : value.getKind() + " key not supported by SwitchNode"; |
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52 assert keySuccessors.length == keyProbabilities.length; |
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53 this.successors = new NodeSuccessorList<>(this, successors); |
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54 this.value = value; |
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55 this.keySuccessors = keySuccessors; |
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56 this.keyProbabilities = keyProbabilities; |
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57 assert assertProbabilities(); |
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58 } |
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59 |
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60 private boolean assertProbabilities() { |
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61 double total = 0; |
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62 for (double d : keyProbabilities) { |
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63 total += d; |
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64 assert d >= 0.0 : "Cannot have negative probabilities in switch node: " + d; |
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65 } |
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66 assert total > 0.999 && total < 1.001 : "Total " + total; |
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67 return true; |
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68 } |
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69 |
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70 protected boolean assertValues() { |
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71 Kind kind = value.getKind(); |
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72 for (int i = 0; i < keyCount(); i++) { |
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73 Constant key = keyAt(i); |
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74 assert key.getKind() == kind; |
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75 } |
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76 return true; |
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77 } |
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78 |
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79 @Override |
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80 public double probability(BeginNode successor) { |
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81 double sum = 0; |
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82 for (int i = 0; i < keySuccessors.length; i++) { |
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83 if (successors.get(keySuccessors[i]) == successor) { |
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84 sum += keyProbabilities[i]; |
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85 } |
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86 } |
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87 return sum; |
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88 } |
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89 |
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90 @Override |
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91 public void setProbability(BeginNode successor, double value) { |
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92 double changeInProbability = 0; |
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93 int nonZeroProbabilityCases = 0; |
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94 for (int i = 0; i < keySuccessors.length; i++) { |
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95 if (successors.get(keySuccessors[i]) == successor) { |
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96 changeInProbability += keyProbabilities[i] - value; |
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97 keyProbabilities[i] = value; |
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98 } else if (keyProbabilities[i] > 0) { |
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99 nonZeroProbabilityCases++; |
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100 } |
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101 } |
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102 |
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103 if (nonZeroProbabilityCases > 0) { |
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104 double changePerEntry = changeInProbability / nonZeroProbabilityCases; |
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105 if (changePerEntry != 0) { |
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106 for (int i = 0; i < keyProbabilities.length; i++) { |
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107 if (keyProbabilities[i] > 0) { |
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108 keyProbabilities[i] = keyProbabilities[i] + changePerEntry; |
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109 } |
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110 } |
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111 } |
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112 } |
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113 |
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114 assertProbabilities(); |
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115 } |
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116 |
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117 public ValueNode value() { |
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118 return value; |
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119 } |
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120 |
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121 public abstract boolean isSorted(); |
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122 |
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123 /** |
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124 * The number of distinct keys in this switch. |
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125 */ |
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126 public abstract int keyCount(); |
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127 |
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128 /** |
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129 * The key at the specified position, encoded in a Constant. |
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130 */ |
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131 public abstract Constant keyAt(int i); |
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132 |
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133 /** |
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134 * Returns the index of the successor belonging to the key at the specified index. |
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135 */ |
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136 public int keySuccessorIndex(int i) { |
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137 return keySuccessors[i]; |
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138 } |
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139 |
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140 /** |
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141 * Returns the successor for the key at the given index. |
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142 */ |
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143 public BeginNode keySuccessor(int i) { |
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144 return successors.get(keySuccessors[i]); |
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145 } |
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146 |
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147 /** |
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148 * Returns the probability of the key at the given index. |
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149 */ |
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150 public double keyProbability(int i) { |
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151 return keyProbabilities[i]; |
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152 } |
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153 |
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154 /** |
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155 * Returns the index of the default (fall through) successor of this switch. |
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156 */ |
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157 public int defaultSuccessorIndex() { |
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158 return keySuccessors[keySuccessors.length - 1]; |
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159 } |
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160 |
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161 public BeginNode blockSuccessor(int i) { |
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162 return successors.get(i); |
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163 } |
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164 |
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165 public void setBlockSuccessor(int i, BeginNode s) { |
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166 successors.set(i, s); |
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167 } |
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168 |
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169 public int blockSuccessorCount() { |
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170 return successors.count(); |
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171 } |
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172 |
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173 /** |
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174 * Gets the successor corresponding to the default (fall through) case. |
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175 * |
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176 * @return the default successor |
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177 */ |
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178 public BeginNode defaultSuccessor() { |
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179 if (defaultSuccessorIndex() == -1) { |
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180 throw new GraalInternalError("unexpected"); |
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181 } |
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182 return defaultSuccessorIndex() == -1 ? null : successors.get(defaultSuccessorIndex()); |
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183 } |
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184 |
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185 @Override |
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186 public void afterClone(Node other) { |
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187 SwitchNode oldSwitch = (SwitchNode) other; |
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188 keyProbabilities = Arrays.copyOf(oldSwitch.keyProbabilities, oldSwitch.keyProbabilities.length); |
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189 keySuccessors = Arrays.copyOf(oldSwitch.keySuccessors, oldSwitch.keySuccessors.length); |
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190 } |
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191 } |