Mercurial > hg > graal-compiler
annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2741:a3cd5eb68837
more GraphBuilder cleanup, moved mergeOrClone to GraphBuilder
author | Lukas Stadler <lukas.stadler@jku.at> |
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date | Fri, 20 May 2011 11:11:33 +0200 |
parents | a0dd2b907806 |
children | 6048da340364 |
rev | line source |
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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.c1x.util.*; |
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28 import com.sun.c1x.value.*; |
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29 import com.sun.cri.ci.*; |
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30 |
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31 /** |
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32 * The {@code If} instruction represents a branch that can go one of two directions |
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33 * depending on the outcome of a comparison. |
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34 */ |
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35 public final class If extends BlockEnd { |
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36 |
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37 private static final int INPUT_COUNT = 2; |
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38 private static final int INPUT_X = 0; |
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39 private static final int INPUT_Y = 1; |
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40 |
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41 private static final int SUCCESSOR_COUNT = 0; |
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42 |
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43 @Override |
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44 protected int inputCount() { |
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45 return super.inputCount() + INPUT_COUNT; |
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46 } |
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47 |
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48 @Override |
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49 protected int successorCount() { |
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50 return super.successorCount() + SUCCESSOR_COUNT; |
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51 } |
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52 |
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53 /** |
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54 * The instruction that produces the first input to this comparison. |
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55 */ |
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56 public Value x() { |
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57 return (Value) inputs().get(super.inputCount() + INPUT_X); |
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58 } |
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59 |
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60 public Value setX(Value n) { |
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61 return (Value) inputs().set(super.inputCount() + INPUT_X, n); |
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62 } |
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63 |
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64 /** |
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65 * The instruction that produces the second input to this comparison. |
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66 */ |
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67 public Value y() { |
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68 return (Value) inputs().get(super.inputCount() + INPUT_Y); |
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69 } |
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70 |
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71 public Value setY(Value n) { |
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72 return (Value) inputs().set(super.inputCount() + INPUT_Y, n); |
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73 } |
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74 |
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75 Condition condition; |
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76 boolean unorderedIsTrue; |
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77 |
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78 /** |
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79 * Constructs a new If instruction. |
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80 * @param x the instruction producing the first input to the instruction |
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81 * @param cond the condition (comparison operation) |
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82 * @param y the instruction that produces the second input to this instruction |
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83 * @param trueSucc the block representing the true successor |
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84 * @param falseSucc the block representing the false successor |
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85 * @param stateAfter the state before the branch but after the input values have been popped |
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86 * @param isSafepoint {@code true} if this branch should be considered a safepoint |
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87 * @param graph |
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88 */ |
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89 public If(Value x, Condition cond, Value y, |
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90 BlockBegin trueSucc, BlockBegin falseSucc, FrameState stateAfter, Graph graph) { |
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91 super(CiKind.Illegal, stateAfter, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph); |
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92 assert Util.archKindsEqual(x, y); |
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93 condition = cond; |
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94 setX(x); |
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95 setY(y); |
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96 setBlockSuccessor(0, trueSucc); |
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97 setBlockSuccessor(1, falseSucc); |
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98 } |
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99 |
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100 /** |
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101 * Gets the condition (comparison operation) for this instruction. |
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102 * @return the condition |
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103 */ |
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104 public Condition condition() { |
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105 return condition; |
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106 } |
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107 |
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108 /** |
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109 * Checks whether unordered inputs mean true or false. |
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110 * @return {@code true} if unordered inputs produce true |
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111 */ |
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112 public boolean unorderedIsTrue() { |
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113 return unorderedIsTrue; |
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114 } |
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115 |
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116 /** |
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117 * Gets the block corresponding to the true successor. |
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118 * @return the true successor |
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119 */ |
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120 public BlockBegin trueSuccessor() { |
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121 return blockSuccessor(0); |
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122 } |
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123 |
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124 /** |
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125 * Gets the block corresponding to the false successor. |
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126 * @return the false successor |
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127 */ |
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128 public BlockBegin falseSuccessor() { |
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129 return blockSuccessor(1); |
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130 } |
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131 |
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132 /** |
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133 * Gets the block corresponding to the specified outcome of the branch. |
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134 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise |
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135 * @return the corresponding successor |
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136 */ |
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137 public BlockBegin successor(boolean istrue) { |
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138 return blockSuccessor(istrue ? 0 : 1); |
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139 } |
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140 |
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141 /** |
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142 * Gets the successor of this instruction for the unordered case. |
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143 * @return the successor for unordered inputs |
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144 */ |
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145 public BlockBegin unorderedSuccessor() { |
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146 return successor(unorderedIsTrue()); |
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147 } |
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148 |
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149 /** |
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150 * Swaps the operands to this if and reverses the condition (e.g. > goes to <=). |
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151 * @see Condition#mirror() |
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152 */ |
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153 public void swapOperands() { |
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154 condition = condition.mirror(); |
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155 Value t = x(); |
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156 setX(y()); |
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157 setY(t); |
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158 } |
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159 |
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160 /** |
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161 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=) |
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162 * @see Condition#negate() |
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163 */ |
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164 public void swapSuccessors() { |
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165 unorderedIsTrue = !unorderedIsTrue; |
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166 condition = condition.negate(); |
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167 BlockBegin t = blockSuccessor(0); |
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168 BlockBegin f = blockSuccessor(1); |
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169 setBlockSuccessor(0, f); |
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170 setBlockSuccessor(1, t); |
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171 } |
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172 |
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173 @Override |
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174 public void accept(ValueVisitor v) { |
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175 v.visitIf(this); |
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176 } |
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177 |
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178 @Override |
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179 public void print(LogStream out) { |
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180 out.print("if "). |
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181 print(x()). |
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182 print(' '). |
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183 print(condition().operator). |
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184 print(' '). |
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185 print(y()). |
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186 print(" then B"). |
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187 print(blockSuccessors().get(0).blockID). |
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188 print(" else B"). |
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189 print(blockSuccessors().get(1).blockID); |
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190 } |
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191 |
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192 @Override |
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193 public String shortName() { |
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194 return "If " + condition.operator; |
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195 } |
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196 |
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197 |
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198 } |