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annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2776:398b8fa5dc81

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Removed stateAfter from BlockEnd class. Clean up.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Tue, 24 May 2011 13:55:56 +0200
parents 93fd92c9f8b0
children d3fc4fe063bf
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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.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 public final class If extends BlockEnd {
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35
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36 private static final int INPUT_COUNT = 2;
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37 private static final int INPUT_X = 0;
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38 private static final int INPUT_Y = 1;
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39
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40 private static final int SUCCESSOR_COUNT = 0;
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41
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42 @Override
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43 protected int inputCount() {
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44 return super.inputCount() + INPUT_COUNT;
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45 }
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46
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47 @Override
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48 protected int successorCount() {
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49 return super.successorCount() + SUCCESSOR_COUNT;
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50 }
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51
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52 /**
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53 * The instruction that produces the first input to this comparison.
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54 */
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55 public Value x() {
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56 return (Value) inputs().get(super.inputCount() + INPUT_X);
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57 }
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58
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59 public Value setX(Value n) {
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60 return (Value) inputs().set(super.inputCount() + INPUT_X, n);
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61 }
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62
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63 /**
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64 * The instruction that produces the second input to this comparison.
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65 */
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66 public Value y() {
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67 return (Value) inputs().get(super.inputCount() + INPUT_Y);
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68 }
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69
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70 public Value setY(Value n) {
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71 return (Value) inputs().set(super.inputCount() + INPUT_Y, n);
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72 }
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73
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74 Condition condition;
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75 boolean unorderedIsTrue;
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76
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77 /**
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78 * Constructs a new If instruction.
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79 * @param x the instruction producing the first input to the instruction
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80 * @param cond the condition (comparison operation)
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81 * @param y the instruction that produces the second input to this instruction
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82 * @param stateAfter the state before the branch but after the input values have been popped
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83 * @param graph
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84 */
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85 public If(Value x, Condition cond, Value y, Graph graph) {
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86 super(CiKind.Illegal, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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87 assert Util.archKindsEqual(x, y);
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88 condition = cond;
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89 setX(x);
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90 setY(y);
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91 }
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92
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93 /**
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94 * Gets the condition (comparison operation) for this instruction.
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95 * @return the condition
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96 */
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97 public Condition condition() {
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98 return condition;
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99 }
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100
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101 /**
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102 * Checks whether unordered inputs mean true or false.
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103 * @return {@code true} if unordered inputs produce true
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104 */
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105 public boolean unorderedIsTrue() {
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106 return unorderedIsTrue;
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107 }
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108
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109 /**
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110 * Gets the block corresponding to the true successor.
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111 * @return the true successor
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112 */
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113 public Instruction trueSuccessor() {
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114 return blockSuccessor(0);
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115 }
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116
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117 /**
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118 * Gets the block corresponding to the false successor.
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119 * @return the false successor
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120 */
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121 public Instruction falseSuccessor() {
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122 return blockSuccessor(1);
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123 }
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124
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125 /**
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126 * Gets the block corresponding to the specified outcome of the branch.
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127 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise
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128 * @return the corresponding successor
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129 */
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130 public Instruction successor(boolean istrue) {
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131 return blockSuccessor(istrue ? 0 : 1);
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132 }
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133
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134 /**
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135 * Gets the successor of this instruction for the unordered case.
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136 * @return the successor for unordered inputs
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137 */
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138 public Instruction unorderedSuccessor() {
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139 return successor(unorderedIsTrue());
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140 }
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141
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142 /**
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143 * Swaps the operands to this if and reverses the condition (e.g. > goes to <=).
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144 * @see Condition#mirror()
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145 */
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146 public void swapOperands() {
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147 condition = condition.mirror();
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148 Value t = x();
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149 setX(y());
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150 setY(t);
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151 }
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152
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153 /**
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154 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=)
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155 * @see Condition#negate()
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156 */
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157 public void swapSuccessors() {
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158 unorderedIsTrue = !unorderedIsTrue;
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159 condition = condition.negate();
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160 Instruction t = blockSuccessor(0);
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161 Instruction f = blockSuccessor(1);
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162 setBlockSuccessor(0, f);
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163 setBlockSuccessor(1, t);
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164 }
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165
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166 @Override
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167 public void accept(ValueVisitor v) {
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168 v.visitIf(this);
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169 }
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170
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171 @Override
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172 public void print(LogStream out) {
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173 out.print("if ").
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174 print(x()).
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175 print(' ').
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176 print(condition().operator).
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177 print(' ').
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178 print(y()).
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179 print(" then B").
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180 print(blockSuccessors().get(0).blockID).
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181 print(" else B").
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182 print(blockSuccessors().get(1).blockID);
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183 }
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184
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185 @Override
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186 public String shortName() {
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187 return "If " + condition.operator;
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188 }
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189
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190
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191 }