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annotate graal/GraalCompiler/src/com/sun/c1x/ir/If.java @ 2616:3558ca7088c0

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FrameState and Graphviz changes: * removed popx, pushx methods from GraphBuilder * FrameState subclass of Value * added String shortName() to Node * added GraphvizPrinter option to use short names * small hack in GraphvizPrinter: omit FrameState->Local connections * added GraalGraphviz to implicit classpatch (read from GRAAL env var)
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 09 May 2011 17:00:25 +0200
parents 0c6564c254af
children a0dd2b907806
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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.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, boolean isSafepoint, Graph graph) {
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91 super(CiKind.Illegal, stateAfter, isSafepoint, 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 if (isSafepoint()) {
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191 out.print(" (safepoint)");
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192 }
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193 }
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194
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195 @Override
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196 public String shortName() {
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197 return "If " + condition.operator;
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198 }
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199
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200
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201 }