Mercurial > hg > graal-jvmci-8
annotate graal/Compiler/src/com/sun/c1x/ir/UnsafeCast.java @ 2507:9ec15d6914ca
Pull over of compiler from maxine repository.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 27 Apr 2011 11:43:22 +0200 |
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1 /* |
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2 * Copyright (c) 2010, 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.cri.bytecode.*; |
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27 import com.sun.cri.ci.*; |
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28 import com.sun.cri.ri.*; |
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29 |
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30 /** |
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31 * The {@code UnsafeCast} instruction represents a {@link Bytecodes#UNSAFE_CAST}. |
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32 * |
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33 * @author Doug Simon |
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34 */ |
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35 public final class UnsafeCast extends Instruction { |
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36 |
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37 public final RiType toType; |
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38 |
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39 /** |
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40 * The instruction that produced the value being unsafe cast. |
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41 */ |
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42 private Value value; |
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43 |
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44 /** |
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45 * Denotes if this is a redundant cast at the machine level. That is the source |
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46 * and the destination kind are implemented by the same machine kind. |
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47 */ |
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48 public final boolean redundant; |
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49 |
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50 /** |
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51 * Creates a new UnsafeCast instruction. |
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52 * |
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53 * @param toType the the being cast to |
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54 * @param value the value being cast |
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55 */ |
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56 public UnsafeCast(RiType toType, Value value, boolean redundant) { |
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57 super(toType.kind().stackKind()); |
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58 this.toType = toType; |
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59 this.value = value; |
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60 this.redundant = redundant; |
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61 } |
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62 |
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63 /** |
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64 * Gets the first non-redundant value derived from this value. If this |
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65 * value is not {@linkplain #redundant}, then it is returned. Otherwise, |
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66 * the first value found by following {@link #value()} that is not an |
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67 * unsafe cast or is not redundant is returned. |
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68 */ |
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69 public Value nonRedundantReplacement() { |
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70 if (!redundant) { |
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71 return this; |
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72 } |
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73 if (!(value instanceof UnsafeCast)) { |
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74 return value; |
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75 } |
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76 return ((UnsafeCast) value).nonRedundantReplacement(); |
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77 } |
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78 |
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79 /** |
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80 * Gets the instruction that produced the value being unsafe cast. |
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81 */ |
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82 public Value value() { |
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83 return value; |
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84 } |
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85 |
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86 @Override |
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87 public RiType declaredType() { |
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88 return toType; |
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89 } |
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90 |
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91 @Override |
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92 public RiType exactType() { |
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93 return declaredType().exactType(); |
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94 } |
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95 |
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96 @Override |
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97 public void accept(ValueVisitor v) { |
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98 v.visitUnsafeCast(this); |
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99 } |
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100 |
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101 /** |
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102 * Iterates over the input values to this instruction. |
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103 * @param closure the closure to apply |
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104 */ |
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105 @Override |
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106 public void inputValuesDo(ValueClosure closure) { |
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107 value = closure.apply(value); |
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108 } |
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109 |
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110 @Override |
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111 public void print(LogStream out) { |
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112 out.print("unsafe_cast("). |
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113 print(value). |
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114 print(") "). |
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115 print(CiUtil.toJavaName(toType)); |
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116 } |
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117 } |