Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2876:7d7cf33f8466
Subclasses for arithmetic
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Tue, 07 Jun 2011 22:51:22 +0200 |
parents | 45422967cbcf |
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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.sun.c1x.ir; |
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24 |
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25 import com.oracle.graal.graph.*; |
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26 import com.sun.c1x.debug.*; |
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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 BlockEnd { |
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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 Instruction 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 Instruction 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 Instruction 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 " + compare().condition.operator; |
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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(compare(), into); |
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118 } |
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119 } |