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annotate graal/Compiler/src/com/sun/c1x/ir/LoadField.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.*;
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26 import com.sun.c1x.debug.*;
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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 import com.sun.cri.ri.*;
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30
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31 /**
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32 * The {@code LoadField} instruction represents a read of a static or instance field.
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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 LoadField extends AccessField {
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37
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38 /**
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39 * Creates a new LoadField instance.
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40 * @param object the receiver object
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41 * @param field the compiler interface field
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42 * @param isStatic indicates if the field is static
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43 * @param stateBefore the state before the field access
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44 * @param isLoaded indicates if the class is loaded
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45 */
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46 public LoadField(Value object, RiField field, boolean isStatic, FrameState stateBefore, boolean isLoaded) {
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47 super(field.kind().stackKind(), object, field, isStatic, stateBefore, isLoaded);
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48 }
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49
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50 /**
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51 * Gets the declared type of the field being accessed.
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52 * @return the declared type of the field being accessed.
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53 */
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54 @Override
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55 public RiType declaredType() {
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56 return field().type();
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57 }
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58
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59 /**
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60 * Gets the exact type of the field being accessed. If the field type is
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61 * a primitive array or an instance class and the class is loaded and final,
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62 * then the exact type is the same as the declared type. Otherwise it is {@code null}
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63 * @return the exact type of the field if known; {@code null} otherwise
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64 */
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65 @Override
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66 public RiType exactType() {
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67 RiType declaredType = declaredType();
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68 return declaredType.isResolved() ? declaredType.exactType() : null;
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69 }
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70
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71 @Override
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72 public void accept(ValueVisitor v) {
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73 v.visitLoadField(this);
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74 }
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75
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76 /**
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77 * Gets a constant value to which this load can be reduced.
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78 *
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79 * @return {@code null} if this load cannot be reduced to a constant
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80 */
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81 public CiConstant constantValue() {
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82 if (!C1XOptions.CanonicalizeConstantFields) {
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83 return null;
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84 }
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85 if (isStatic()) {
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86 return field.constantValue(null);
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87 } else if (object().isConstant()) {
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88 CiConstant cons = field.constantValue(object().asConstant());
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89 if (cons != null) {
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90 return cons;
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91 }
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92 return cons;
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93 }
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94 return null;
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95 }
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96
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97 @Override
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98 public void print(LogStream out) {
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99 out.print(object()).
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100 print(".").
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101 print(field.name()).
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102 print(" [field: ").
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103 print(CiUtil.format("%h.%n:%t", field, false)).
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104 print("]");
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105 }
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106 }