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annotate graal/com.oracle.max.graal.compiler/src/com/oracle/max/graal/compiler/ir/If.java @ 3006:6da8b9c8cdad

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Renamed BlockEnd=>ControlSplit.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Thu, 16 Jun 2011 16:32:52 +0200
parents f49685081630
children de3ac4888421
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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.max.graal.compiler.ir;
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24
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25 import com.oracle.max.graal.compiler.debug.*;
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26 import com.oracle.max.graal.graph.*;
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27 import com.sun.cri.ci.*;
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28
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29 /**
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30 * The {@code If} instruction represents a branch that can go one of two directions
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31 * depending on the outcome of a comparison.
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32 */
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33 public final class If extends ControlSplit {
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34
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35 private static final int INPUT_COUNT = 1;
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36 private static final int INPUT_COMPARE = 0;
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37
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38 private static final int SUCCESSOR_COUNT = 0;
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39
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40 @Override
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41 protected int inputCount() {
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42 return super.inputCount() + INPUT_COUNT;
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43 }
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44
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45 @Override
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46 protected int successorCount() {
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47 return super.successorCount() + SUCCESSOR_COUNT;
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48 }
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49
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50 /**
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51 * The instruction that produces the first input to this comparison.
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52 */
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53 public Compare compare() {
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54 return (Compare) inputs().get(super.inputCount() + INPUT_COMPARE);
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55 }
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56
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57 public Value setCompare(Compare n) {
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58 return (Value) inputs().set(super.inputCount() + INPUT_COMPARE, n);
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59 }
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60
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61 public If(Compare compare, Graph graph) {
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62 super(CiKind.Illegal, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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63 setCompare(compare);
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64 }
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65
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66 /**
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67 * Gets the block corresponding to the true successor.
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68 * @return the true successor
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69 */
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70 public FixedNode trueSuccessor() {
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71 return blockSuccessor(0);
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72 }
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73
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74 /**
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75 * Gets the block corresponding to the false successor.
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76 * @return the false successor
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77 */
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78 public FixedNode falseSuccessor() {
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79 return blockSuccessor(1);
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80 }
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81
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82 /**
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83 * Gets the block corresponding to the specified outcome of the branch.
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84 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise
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85 * @return the corresponding successor
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86 */
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87 public FixedNode successor(boolean istrue) {
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88 return blockSuccessor(istrue ? 0 : 1);
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89 }
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90
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91 @Override
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92 public void accept(ValueVisitor v) {
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93 v.visitIf(this);
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94 }
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95
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96 @Override
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97 public void print(LogStream out) {
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98 out.print("if ").
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99 print(compare().x()).
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100 print(' ').
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101 print(compare().condition().operator).
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102 print(' ').
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103 print(compare().y()).
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104 print(" then ").
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105 print(blockSuccessors().get(0)).
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106 print(" else ").
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107 print(blockSuccessors().get(1));
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108 }
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109
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110 @Override
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111 public String shortName() {
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112 return "If";
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113 }
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114
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115 @Override
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116 public Node copy(Graph into) {
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117 return new If(null, into);
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118 }
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119 }