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annotate graal/GraalCompiler/src/com/sun/c1x/ir/CheckCast.java @ 2827:bd17ac598c6e

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Graph cloning, initial version (not completely working)
author Lukas Stadler <lukas.stadler@jku.at>
date Mon, 30 May 2011 18:46:57 +0200
parents 015be60afcf3
children 14708c03abba
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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.cri.bytecode.*;
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29 import com.sun.cri.ci.*;
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30 import com.sun.cri.ri.*;
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31
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32 /**
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33 * The {@code CheckCast} instruction represents a {@link Bytecodes#CHECKCAST}.
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34 */
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35 public final class CheckCast extends TypeCheck {
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36
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37 private static final int INPUT_COUNT = 0;
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38 private static final int SUCCESSOR_COUNT = 0;
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39
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40 /**
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41 * Creates a new CheckCast instruction.
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42 * @param targetClass the class being cast to
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43 * @param object the instruction producing the object
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44 * @param stateBefore the state before the cast
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45 * @param graph
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46 */
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47 public CheckCast(RiType targetClass, Value targetClassInstruction, Value object, Graph graph) {
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48 super(targetClass, targetClassInstruction, object, CiKind.Object, INPUT_COUNT, SUCCESSOR_COUNT, graph);
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49 setNonNull(true);
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50 }
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51
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52 /**
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53 * Gets the declared type of the result of this instruction.
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54 * @return the declared type of the result
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55 */
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56 @Override
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57 public RiType declaredType() {
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58 return targetClass;
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59 }
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60
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61 /**
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62 * Gets the exact type of the result of this instruction.
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63 * @return the exact type of the result
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64 */
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65 @Override
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66 public RiType exactType() {
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67 return targetClass.isResolved() ? targetClass.exactType() : null;
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68 }
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69
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70 @Override
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71 public void accept(ValueVisitor v) {
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72 v.visitCheckCast(this);
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73 }
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74
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75 @Override
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76 public int valueNumber() {
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77 return targetClass.isResolved() ? Util.hash1(Bytecodes.CHECKCAST, object()) : 0;
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78 }
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79
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80 @Override
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81 public boolean valueEqual(Node i) {
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82 if (i instanceof CheckCast) {
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83 CheckCast o = (CheckCast) i;
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84 return targetClass == o.targetClass && object() == o.object();
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85 }
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86 return false;
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87 }
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88
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89 @Override
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90 public void print(LogStream out) {
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91 out.print("checkcast(").
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92 print(object()).
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93 print(",").
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94 print(targetClassInstruction()).
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95 print(") ").
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96 print(CiUtil.toJavaName(targetClass()));
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97 }
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98
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99 @Override
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100 public Node copy(Graph into) {
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101 CheckCast x = new CheckCast(targetClass, null, null, into);
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102 x.setNonNull(isNonNull());
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103 return x;
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104 }
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105 }