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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/SwitchNode.java @ 16672:f2cd7b3d5aef

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unswitching: check full SwitchNode structure
author Gilles Duboscq <duboscq@ssw.jku.at>
date Fri, 01 Aug 2014 15:19:26 +0200
parents c164a505fc23
children 5d468add216f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Copyright (c) 2009, 2014, 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.compiler.common.type.*;
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30 import com.oracle.graal.graph.*;
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31 import com.oracle.graal.nodes.*;
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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
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41 // do not change the contents of these arrays:
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42 private final double[] keyProbabilities;
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43 private final int[] keySuccessors;
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44
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45 /**
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46 * Constructs a new Switch.
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47 *
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48 * @param value the instruction that provides the value to be switched over
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49 * @param successors the list of successors of this switch
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50 */
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51 public SwitchNode(ValueNode value, BeginNode[] successors, int[] keySuccessors, double[] keyProbabilities) {
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52 super(StampFactory.forVoid());
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53 assert value.getKind() == Kind.Int || value.getKind() == Kind.Long || value.getKind() == Kind.Object : value.getKind() + " key not supported by SwitchNode";
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54 assert keySuccessors.length == keyProbabilities.length;
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55 this.successors = new NodeSuccessorList<>(this, successors);
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56 this.value = value;
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57 this.keySuccessors = keySuccessors;
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58 this.keyProbabilities = keyProbabilities;
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59 assert assertProbabilities();
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60 }
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61
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62 private boolean assertProbabilities() {
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63 double total = 0;
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64 for (double d : keyProbabilities) {
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65 total += d;
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66 assert d >= 0.0 : "Cannot have negative probabilities in switch node: " + d;
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67 }
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68 assert total > 0.999 && total < 1.001 : "Total " + total;
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69 return true;
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70 }
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71
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72 protected boolean assertValues() {
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73 Kind kind = value.getKind();
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74 for (int i = 0; i < keyCount(); i++) {
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75 Constant key = keyAt(i);
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76 assert key.getKind() == kind;
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77 }
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78 return true;
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79 }
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80
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81 @Override
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82 public double probability(BeginNode successor) {
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83 double sum = 0;
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84 for (int i = 0; i < keySuccessors.length; i++) {
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85 if (successors.get(keySuccessors[i]) == successor) {
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86 sum += keyProbabilities[i];
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87 }
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88 }
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89 return sum;
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90 }
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91
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92 public ValueNode value() {
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93 return value;
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94 }
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95
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96 public abstract boolean isSorted();
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97
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98 /**
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99 * The number of distinct keys in this switch.
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100 */
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101 public abstract int keyCount();
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102
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103 /**
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104 * The key at the specified position, encoded in a Constant.
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105 */
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106 public abstract Constant keyAt(int i);
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107
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108 public boolean structureEquals(SwitchNode switchNode) {
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109 return Arrays.equals(keySuccessors, switchNode.keySuccessors) && equalKeys(switchNode);
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110 }
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111
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112 /**
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113 * Returns true if the switch has the same keys in the same order as this switch.
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114 */
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115 public abstract boolean equalKeys(SwitchNode switchNode);
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116
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117 /**
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118 * Returns the index of the successor belonging to the key at the specified index.
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119 */
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120 public int keySuccessorIndex(int i) {
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121 return keySuccessors[i];
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122 }
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123
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124 /**
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125 * Returns the successor for the key at the given index.
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126 */
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127 public BeginNode keySuccessor(int i) {
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128 return successors.get(keySuccessors[i]);
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129 }
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130
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131 /**
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132 * Returns the probability of the key at the given index.
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133 */
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134 public double keyProbability(int i) {
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135 return keyProbabilities[i];
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136 }
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137
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138 /**
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139 * Returns the index of the default (fall through) successor of this switch.
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140 */
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141 public int defaultSuccessorIndex() {
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142 return keySuccessors[keySuccessors.length - 1];
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143 }
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144
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145 public BeginNode blockSuccessor(int i) {
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146 return successors.get(i);
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147 }
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148
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149 public void setBlockSuccessor(int i, BeginNode s) {
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150 successors.set(i, s);
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151 }
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152
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153 public int blockSuccessorCount() {
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154 return successors.count();
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155 }
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156
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157 /**
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158 * Gets the successor corresponding to the default (fall through) case.
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159 *
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160 * @return the default successor
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161 */
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162 public BeginNode defaultSuccessor() {
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163 if (defaultSuccessorIndex() == -1) {
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164 throw new GraalInternalError("unexpected");
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165 }
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166 return defaultSuccessorIndex() == -1 ? null : successors.get(defaultSuccessorIndex());
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167 }
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168 }