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annotate graal/Compiler/src/com/sun/c1x/ir/Op2.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
9ec15d6914ca Pull over of compiler from maxine repository.
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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.util.*;
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26 import com.sun.cri.bytecode.*;
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27 import com.sun.cri.ci.*;
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28
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29 /**
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30 * The {@code Op2} class is the base of arithmetic and logic operations with two inputs.
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31 *
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32 * @author Ben L. Titzer
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33 */
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34 public abstract class Op2 extends Instruction {
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35
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36 /**
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37 * The opcode of this instruction.
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38 */
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39 public final int opcode;
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40
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41 Value x;
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42 Value y;
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43
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44 /**
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45 * Creates a new Op2 instance.
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46 * @param kind the result type of this instruction
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47 * @param opcode the bytecode opcode
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48 * @param x the first input instruction
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49 * @param y the second input instruction
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50 */
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51 public Op2(CiKind kind, int opcode, Value x, Value y) {
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52 super(kind);
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53 this.opcode = opcode;
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54 this.x = x;
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55 this.y = y;
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56 }
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57
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58 /**
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59 * Gets the first input to this instruction.
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60 * @return the first input to this instruction
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61 */
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62 public final Value x() {
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63 return x;
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64 }
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65
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66 /**
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67 * Gets the second input to this instruction.
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68 * @return the second input to this instruction
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69 */
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70 public final Value y() {
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71 return y;
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72 }
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73
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74 /**
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75 * Swaps the operands of this instruction. This is only legal for commutative operations.
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76 */
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77 public void swapOperands() {
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78 assert Bytecodes.isCommutative(opcode);
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79 Value t = x;
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80 x = y;
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81 y = t;
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82 }
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83
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84 /**
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85 * Iterates over the inputs to this instruction.
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86 * @param closure the closure to apply to each input value
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87 */
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88 @Override
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89 public void inputValuesDo(ValueClosure closure) {
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90 x = closure.apply(x);
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91 y = closure.apply(y);
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92 }
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93
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94 @Override
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95 public int valueNumber() {
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96 return Util.hash2(opcode, x, y);
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97 }
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98
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99 @Override
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100 public boolean valueEqual(Instruction i) {
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101 if (i instanceof Op2) {
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102 Op2 o = (Op2) i;
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103 return opcode == o.opcode && x == o.x && y == o.y;
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104 }
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105 return false;
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106 }
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107 }