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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/SwitchNode.java @ 18993:480bd3b1adcd

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Rename BeginNode => AbstractBeginNode.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Wed, 28 Jan 2015 00:50:31 +0100
parents e04d70a4d3ae
children 7e2c87dae93e
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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.nodeinfo.*;
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32 import com.oracle.graal.nodes.*;
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33
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34 /**
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35 * The {@code SwitchNode} class is the base of both lookup and table switches.
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36 */
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37 @NodeInfo
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38 public abstract class SwitchNode extends ControlSplitNode {
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39
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40 @Successor protected NodeSuccessorList<AbstractBeginNode> successors;
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41 @Input protected ValueNode value;
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42
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43 // do not change the contents of these arrays:
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44 protected final double[] keyProbabilities;
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45 protected final int[] keySuccessors;
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46
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47 /**
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48 * Constructs a new Switch.
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49 *
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50 * @param value the instruction that provides the value to be switched over
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51 * @param successors the list of successors of this switch
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52 */
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53 public SwitchNode(ValueNode value, AbstractBeginNode[] successors, int[] keySuccessors, double[] keyProbabilities) {
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54 super(StampFactory.forVoid());
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55 assert value.stamp().getStackKind().isNumericInteger() || value.stamp() instanceof AbstractPointerStamp : value.stamp() + " key not supported by SwitchNode";
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56 assert keySuccessors.length == keyProbabilities.length;
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57 this.successors = new NodeSuccessorList<>(this, successors);
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58 this.value = value;
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59 this.keySuccessors = keySuccessors;
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60 this.keyProbabilities = keyProbabilities;
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61 assert assertProbabilities();
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62 }
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63
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64 private boolean assertProbabilities() {
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65 double total = 0;
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66 for (double d : keyProbabilities) {
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67 total += d;
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68 assert d >= 0.0 : "Cannot have negative probabilities in switch node: " + d;
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69 }
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70 assert total > 0.999 && total < 1.001 : "Total " + total;
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71 return true;
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72 }
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73
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74 @Override
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75 public double probability(AbstractBeginNode successor) {
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76 double sum = 0;
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77 for (int i = 0; i < keySuccessors.length; i++) {
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78 if (successors.get(keySuccessors[i]) == successor) {
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79 sum += keyProbabilities[i];
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80 }
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81 }
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82 return sum;
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83 }
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84
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85 public ValueNode value() {
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86 return value;
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87 }
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88
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89 public abstract boolean isSorted();
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90
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91 /**
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92 * The number of distinct keys in this switch.
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93 */
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94 public abstract int keyCount();
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95
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96 /**
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97 * The key at the specified position, encoded in a Constant.
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98 */
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99 public abstract JavaConstant keyAt(int i);
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100
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101 public boolean structureEquals(SwitchNode switchNode) {
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102 return Arrays.equals(keySuccessors, switchNode.keySuccessors) && equalKeys(switchNode);
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103 }
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104
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105 /**
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106 * Returns true if the switch has the same keys in the same order as this switch.
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107 */
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108 public abstract boolean equalKeys(SwitchNode switchNode);
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109
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110 /**
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111 * Returns the index of the successor belonging to the key at the specified index.
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112 */
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113 public int keySuccessorIndex(int i) {
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114 return keySuccessors[i];
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115 }
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116
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117 /**
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118 * Returns the successor for the key at the given index.
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119 */
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120 public AbstractBeginNode keySuccessor(int i) {
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121 return successors.get(keySuccessors[i]);
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122 }
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123
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124 /**
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125 * Returns the probability of the key at the given index.
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126 */
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127 public double keyProbability(int i) {
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128 return keyProbabilities[i];
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129 }
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130
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131 /**
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132 * Returns the index of the default (fall through) successor of this switch.
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133 */
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134 public int defaultSuccessorIndex() {
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135 return keySuccessors[keySuccessors.length - 1];
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136 }
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137
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138 public AbstractBeginNode blockSuccessor(int i) {
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139 return successors.get(i);
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140 }
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141
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142 public void setBlockSuccessor(int i, AbstractBeginNode s) {
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143 successors.set(i, s);
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144 }
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145
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146 public int blockSuccessorCount() {
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147 return successors.count();
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148 }
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149
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150 /**
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151 * Gets the successor corresponding to the default (fall through) case.
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152 *
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153 * @return the default successor
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154 */
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155 public AbstractBeginNode defaultSuccessor() {
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156 if (defaultSuccessorIndex() == -1) {
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157 throw new GraalInternalError("unexpected");
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158 }
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159 return successors.get(defaultSuccessorIndex());
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160 }
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161 }