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annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2851:14708c03abba

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Remove isNonNull
author Gilles Duboscq <gilles.duboscq@oracle.com>
date Tue, 07 Jun 2011 11:36:32 +0200
parents bfce42cd9c07
children 45422967cbcf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 condition 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 graph
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83 */
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84 public If(Value x, Condition condition, Value y, Graph graph) {
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85 super(CiKind.Illegal, 2, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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86 assert (x == null && y == null) || Util.archKindsEqual(x, y);
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87 this.condition = condition;
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88 setX(x);
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89 setY(y);
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90 }
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91
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92 /**
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93 * Gets the condition (comparison operation) for this instruction.
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94 * @return the condition
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95 */
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96 public Condition condition() {
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97 return condition;
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98 }
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99
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100 /**
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101 * Checks whether unordered inputs mean true or false.
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102 * @return {@code true} if unordered inputs produce true
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103 */
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104 public boolean unorderedIsTrue() {
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105 return unorderedIsTrue;
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106 }
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107
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108 /**
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109 * Gets the block corresponding to the true successor.
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110 * @return the true successor
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111 */
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112 public Instruction trueSuccessor() {
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113 return blockSuccessor(0);
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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 false successor.
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118 * @return the false successor
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119 */
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120 public Instruction falseSuccessor() {
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121 return blockSuccessor(1);
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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 specified outcome of the branch.
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126 * @param istrue {@code true} if the true successor is requested, {@code false} otherwise
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127 * @return the corresponding successor
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128 */
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129 public Instruction successor(boolean istrue) {
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130 return blockSuccessor(istrue ? 0 : 1);
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131 }
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132
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133 /**
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134 * Gets the successor of this instruction for the unordered case.
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135 * @return the successor for unordered inputs
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136 */
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137 public Instruction unorderedSuccessor() {
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138 return successor(unorderedIsTrue());
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139 }
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140
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141 /**
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142 * Swaps the operands to this if and reverses the condition (e.g. > goes to <=).
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143 * @see Condition#mirror()
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144 */
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145 public void swapOperands() {
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146 condition = condition.mirror();
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147 Value t = x();
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148 setX(y());
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149 setY(t);
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150 }
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151
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152 /**
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153 * Swaps the successor blocks to this if and negates the condition (e.g. == goes to !=)
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154 * @see Condition#negate()
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155 */
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156 public void swapSuccessors() {
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157 unorderedIsTrue = !unorderedIsTrue;
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158 condition = condition.negate();
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159 Instruction t = blockSuccessor(0);
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160 Instruction f = blockSuccessor(1);
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161 setBlockSuccessor(0, f);
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162 setBlockSuccessor(1, t);
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163 }
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164
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165 @Override
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166 public void accept(ValueVisitor v) {
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167 v.visitIf(this);
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168 }
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169
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170 @Override
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171 public void print(LogStream out) {
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172 out.print("if ").
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173 print(x()).
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174 print(' ').
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175 print(condition().operator).
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176 print(' ').
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177 print(y()).
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178 print(" then ").
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179 print(blockSuccessors().get(0)).
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180 print(" else ").
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181 print(blockSuccessors().get(1));
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182 }
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183
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184 @Override
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185 public String shortName() {
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186 return "If " + condition.operator;
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187 }
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188
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189 @Override
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190 public Node copy(Graph into) {
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191 If x = new If(null, condition, null, into);
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192 x.unorderedIsTrue = unorderedIsTrue;
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193 return x;
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194 }
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195 }