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annotate graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/extended/SwitchNode.java @ 5698:764db9ada24f

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rework of switch operations: unify lookup- and tableswitch, introduce switch lir instructions
author Lukas Stadler <lukas.stadler@jku.at>
date Wed, 27 Jun 2012 11:51:18 +0200
parents 141817e206d4
children 4d7175cf3526
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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 com.oracle.graal.api.meta.*;
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26 import com.oracle.graal.graph.*;
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27 import com.oracle.graal.nodes.*;
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28 import com.oracle.graal.nodes.type.*;
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29
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30 /**
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31 * The {@code SwitchNode} class is the base of both lookup and table switches.
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32 */
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33 public abstract class SwitchNode extends ControlSplitNode {
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34
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35 @Input private ValueNode value;
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36 private final double[] keyProbabilities;
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37 private final int[] keySuccessors;
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38
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39 public ValueNode value() {
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40 return value;
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41 }
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42
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43 /**
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44 * Constructs a new Switch.
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45 * @param value the instruction that provides the value to be switched over
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46 * @param successors the list of successors of this switch
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47 * @param stateAfter the state after the switch
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48 */
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49 public SwitchNode(ValueNode value, BeginNode[] successors, double[] successorProbabilities, int[] keySuccessors, double[] keyProbabilities) {
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50 super(StampFactory.forVoid(), successors, successorProbabilities);
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51 assert keySuccessors.length == keyProbabilities.length;
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52 this.value = value;
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53 this.keySuccessors = keySuccessors;
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54 this.keyProbabilities = keyProbabilities;
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55 }
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56
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57 /**
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58 * The number of distinct keys in this switch.
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59 */
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60 public abstract int keyCount();
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61
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62 /**
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63 * The key at the specified position, encoded in a Constant.
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64 */
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65 public abstract Constant keyAt(int i);
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66
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67 /**
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68 * Returns the index of the successor belonging to the key at the specified index.
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69 */
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70 public int keySuccessorIndex(int i) {
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71 return keySuccessors[i];
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72 }
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73
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74 /**
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75 * Returns the successor for the key at the given index.
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76 */
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77 public BeginNode keySuccessor(int i) {
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78 return blockSuccessor(keySuccessors[i]);
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79 }
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80
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81 /**
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82 * Returns the probability of the key at the given index.
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83 */
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84 public double keyProbability(int i) {
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85 return keyProbabilities[i];
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86 }
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87
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88 /**
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89 * Returns the index of the default (fall through) successor of this switch.
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90 */
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91 public int defaultSuccessorIndex() {
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92 return keySuccessors[keySuccessors.length - 1];
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93 }
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94
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95 /**
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96 * Gets the successor corresponding to the default (fall through) case.
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97 * @return the default successor
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98 */
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99 public BeginNode defaultSuccessor() {
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100 if (defaultSuccessorIndex() == -1) {
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101 throw new GraalInternalError("unexpected");
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102 }
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103 return defaultSuccessorIndex() == -1 ? null : blockSuccessor(defaultSuccessorIndex());
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104 }
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105
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106 /**
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107 * Helper function that sums up the probabilities of all keys that lead to a specific successor.
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108 * @return an array of size successorCount with the accumulated probability for each successor.
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109 */
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110 public static double[] successorProbabilites(int successorCount, int[] keySuccessors, double[] keyProbabilities) {
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111 double[] probability = new double[successorCount];
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112 for (int i = 0; i < keySuccessors.length; i++) {
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113 probability[keySuccessors[i]] += keyProbabilities[i];
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114 }
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115 return probability;
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116 }
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117 }