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annotate graal/GraalCompiler/src/com/sun/c1x/ir/AccessField.java @ 2543:c58a301eb2d7

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Clean up on canTrap.
author Thomas Wuerthinger <thomas@wuerthinger.net>
date Wed, 27 Apr 2011 21:22:10 +0200
parents 0f9eeb15e636
children 4a4dab936c1e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 java.lang.reflect.*;
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26
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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 base class of all instructions that access fields.
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33 */
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34 public abstract class AccessField extends StateSplit {
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35
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36 private Value object;
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37 protected final RiField field;
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38
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39 /**
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40 * Constructs a new access field object.
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41 * @param kind the result kind of the access
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42 * @param object the instruction producing the receiver object
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43 * @param field the compiler interface representation of the field
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44 * @param isStatic indicates if the field is static
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45 * @param stateBefore the state before the field access
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46 * @param isLoaded indicates if the class is loaded
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47 */
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48 public AccessField(CiKind kind, Value object, RiField field, FrameState stateBefore) {
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49 super(kind, stateBefore);
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50 this.object = object;
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51 this.field = field;
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52 assert object != null : "every field access must reference some object";
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53 }
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54
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55 /**
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56 * Gets the instruction that produces the receiver object of this field access
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57 * (for instance field accesses).
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58 * @return the instruction that produces the receiver object
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59 */
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60 public Value object() {
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61 return object;
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62 }
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63
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64 /**
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65 * Gets the compiler interface field for this field access.
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66 * @return the compiler interface field for this field access
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67 */
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68 public RiField field() {
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69 return field;
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70 }
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71
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72 /**
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73 * Checks whether this field access is an access to a static field.
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74 * @return {@code true} if this field access is to a static field
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75 */
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76 public boolean isStatic() {
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77 return Modifier.isStatic(field.accessFlags());
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78 }
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79
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80 /**
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81 * Checks whether the class of the field of this access is loaded.
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82 * @return {@code true} if the class is loaded
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83 */
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84 public boolean isLoaded() {
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85 return field.isResolved();
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86 }
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87
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88 /**
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89 * Checks whether this field is declared volatile.
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90 * @return {@code true} if the field is resolved and declared volatile
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91 */
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92 public boolean isVolatile() {
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93 return isLoaded() && Modifier.isVolatile(field.accessFlags());
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94 }
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95
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96 @Override
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97 public void inputValuesDo(ValueClosure closure) {
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98 object = closure.apply(object);
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99 }
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100 }