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annotate graal/Compiler/src/com/sun/c1x/ir/IfOp.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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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.cri.bytecode.*;
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28
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29 /**
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30 * The {@code IfOp} class represents a comparison that yields one of two values.
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31 * Note that these nodes are not built directly from the bytecode but are introduced
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32 * by conditional expression elimination.
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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 IfOp extends Op2 {
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37
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38 Condition cond;
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39 Value trueVal;
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40 Value falseVal;
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41
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42 /**
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43 * Constructs a new IfOp.
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44 * @param x the instruction producing the first value to be compared
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45 * @param cond the condition of the comparison
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46 * @param y the instruction producing the second value to be compared
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47 * @param tval the value produced if the condition is true
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48 * @param fval the value produced if the condition is false
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49 */
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50 public IfOp(Value x, Condition cond, Value y, Value tval, Value fval) {
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51 // TODO: return the appropriate bytecode IF_ICMPEQ, etc
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52 super(tval.kind.meet(fval.kind), Bytecodes.ILLEGAL, x, y);
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53 this.cond = cond;
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54 this.trueVal = tval;
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55 falseVal = fval;
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56 }
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57
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58 /**
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59 * Gets the condition of this if operation.
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60 * @return the condition
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61 */
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62 public Condition condition() {
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63 return cond;
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64 }
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65
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66 /**
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67 * Gets the instruction that produces the value if the comparison is true.
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68 * @return the instruction producing the value upon true
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69 */
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70 public Value trueValue() {
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71 return trueVal;
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72 }
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73
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74 /**
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75 * Gets the instruction that produces the value if the comparison is false.
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76 * @return the instruction producing the value upon false
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77 */
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78 public Value falseValue() {
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79 return falseVal;
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80 }
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81
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82 /**
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83 * Checks whether this comparison operator is commutative (i.e. it is either == or !=).
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84 * @return {@code true} if this comparison is commutative
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85 */
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86 public boolean isCommutative() {
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87 return cond == Condition.EQ || cond == Condition.NE;
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88 }
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89
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90 @Override
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91 public void inputValuesDo(ValueClosure closure) {
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92 super.inputValuesDo(closure);
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93 trueVal = closure.apply(trueVal);
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94 falseVal = closure.apply(falseVal);
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95 }
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96
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97 @Override
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98 public void accept(ValueVisitor v) {
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99 v.visitIfOp(this);
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100 }
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101
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102 @Override
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103 public int valueNumber() {
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104 return Util.hash4(cond.hashCode(), x, y, trueVal, falseVal);
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105 }
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106
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107 @Override
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108 public boolean valueEqual(Instruction i) {
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109 if (i instanceof IfOp) {
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110 IfOp o = (IfOp) i;
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111 return opcode == o.opcode && x == o.x && y == o.y && trueVal == o.trueVal && falseVal == o.falseVal;
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112 }
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113 return false;
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114 }
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115
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116 @Override
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117 public void print(LogStream out) {
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118 out.print(x()).
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119 print(' ').
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120 print(condition().operator).
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121 print(' ').
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122 print(y()).
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123 print(" ? ").
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124 print(trueValue()).
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125 print(" : ").
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126 print(falseValue());
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127 }
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128 }