Mercurial > hg > truffle
annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2509:16b9a8b5ad39
Renamings Runtime=>GraalRuntime and Compiler=>GraalCompiler
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:50:44 +0200 |
parents | graal/Compiler/src/com/sun/c1x/ir/If.java@9ec15d6914ca |
children | 4a016ff4d2df |
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.sun.c1x.debug.*; |
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26 import com.sun.c1x.util.*; |
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27 import com.sun.c1x.value.*; |
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28 import com.sun.cri.ci.*; |
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29 |
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30 /** |
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31 * The {@code If} instruction represents a branch that can go one of two directions |
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32 * depending on the outcome of a comparison. |
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33 * |
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34 * @author Ben L. Titzer |
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35 */ |
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36 public final class If extends BlockEnd { |
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37 |
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38 Value x; |
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39 Value y; |
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40 Condition condition; |
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41 |
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42 /** |
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43 * Constructs a new If instruction. |
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44 * @param x the instruction producing the first input to the instruction |
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45 * @param cond the condition (comparison operation) |
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46 * @param unorderedIsTrue {@code true} if unordered is treated as true (floating point operations) |
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47 * @param y the instruction that produces the second input to this instruction |
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48 * @param trueSucc the block representing the true successor |
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49 * @param falseSucc the block representing the false successor |
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50 * @param stateAfter the state before the branch but after the input values have been popped |
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51 * @param isSafepoint {@code true} if this branch should be considered a safepoint |
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52 */ |
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53 public If(Value x, Condition cond, boolean unorderedIsTrue, Value y, |
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54 BlockBegin trueSucc, BlockBegin falseSucc, FrameState stateAfter, boolean isSafepoint) { |
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55 super(CiKind.Illegal, stateAfter, isSafepoint); |
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56 this.x = x; |
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57 this.y = y; |
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58 condition = cond; |
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59 assert Util.archKindsEqual(x, y); |
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60 initFlag(Flag.UnorderedIsTrue, unorderedIsTrue); |
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61 successors.add(trueSucc); |
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62 successors.add(falseSucc); |
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63 } |
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64 |
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65 /** |
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66 * Gets the instruction that produces the first input to this comparison. |
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67 * @return the instruction producing the first input |
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68 */ |
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69 public Value x() { |
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70 return x; |
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71 } |
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72 |
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73 /** |
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74 * Gets the instruction that produces the second input to this comparison. |
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75 * @return the instruction producing the second input |
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76 */ |
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77 public Value y() { |
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78 return y; |
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79 } |
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80 |
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81 /** |
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82 * Gets the condition (comparison operation) for this instruction. |
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83 * @return the condition |
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84 */ |
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85 public Condition condition() { |
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86 return condition; |
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87 } |
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88 |
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89 /** |
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90 * Checks whether unordered inputs mean true or false. |
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91 * @return {@code true} if unordered inputs produce true |
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92 */ |
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93 public boolean unorderedIsTrue() { |
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94 return checkFlag(Flag.UnorderedIsTrue); |
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95 } |
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96 |
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97 /** |
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98 * Gets the block corresponding to the true successor. |
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99 * @return the true successor |
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100 */ |
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101 public BlockBegin trueSuccessor() { |
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102 return successors.get(0); |
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103 } |
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104 |
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105 /** |
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106 * Gets the block corresponding to the false successor. |
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107 * @return the false successor |
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108 */ |
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109 public BlockBegin falseSuccessor() { |
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110 return successors.get(1); |
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111 } |
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112 |
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113 /** |
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114 * Gets the block corresponding to the specified outcome of the branch. |
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115 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise |
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116 * @return the corresponding successor |
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117 */ |
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118 public BlockBegin successor(boolean istrue) { |
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119 return successors.get(istrue ? 0 : 1); |
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120 } |
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121 |
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122 /** |
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123 * Gets the successor of this instruction for the unordered case. |
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124 * @return the successor for unordered inputs |
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125 */ |
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126 public BlockBegin unorderedSuccessor() { |
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127 return successor(unorderedIsTrue()); |
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128 } |
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129 |
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130 /** |
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131 * Swaps the operands to this if and reverses the condition (e.g. > goes to <=). |
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132 * @see Condition#mirror() |
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133 */ |
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134 public void swapOperands() { |
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135 condition = condition.mirror(); |
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136 Value t = x; |
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137 x = y; |
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138 y = t; |
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139 } |
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140 |
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141 /** |
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142 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=) |
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143 * @see Condition#negate() |
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144 */ |
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145 public void swapSuccessors() { |
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146 setFlag(Flag.UnorderedIsTrue, !unorderedIsTrue()); |
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147 condition = condition.negate(); |
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148 BlockBegin t = successors.get(0); |
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149 BlockBegin f = successors.get(1); |
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150 successors.set(0, f); |
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151 successors.set(1, t); |
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152 } |
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153 |
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154 @Override |
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155 public void inputValuesDo(ValueClosure closure) { |
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156 x = closure.apply(x); |
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157 y = closure.apply(y); |
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158 } |
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159 |
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160 @Override |
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161 public void accept(ValueVisitor v) { |
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162 v.visitIf(this); |
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163 } |
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164 |
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165 @Override |
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166 public void print(LogStream out) { |
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167 out.print("if "). |
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168 print(x()). |
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169 print(' '). |
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170 print(condition().operator). |
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171 print(' '). |
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172 print(y()). |
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173 print(" then B"). |
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174 print(successors().get(0).blockID). |
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175 print(" else B"). |
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176 print(successors().get(1).blockID); |
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177 if (isSafepoint()) { |
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178 out.print(" (safepoint)"); |
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179 } |
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180 } |
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181 } |