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annotate graal/Compiler/src/com/sun/c1x/ir/If.java @ 2507:9ec15d6914ca

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Pull over of compiler from maxine repository.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 11:43:22 +0200
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children
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2507
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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 }