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1 /*
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2 * Copyright 2001 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.debugger.cdbg.basic;
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26
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27 import sun.jvm.hotspot.debugger.*;
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28 import sun.jvm.hotspot.debugger.cdbg.*;
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29 import sun.jvm.hotspot.utilities.Assert;
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30
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31 public class BasicBitType extends BasicIntType implements BitType {
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32 // Integer type or lazy type
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33 private Type underlyingType;
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34 private int sizeInBits;
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35 private int offset;
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36
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37 /** Underlying type of enum must be an integer type (or as yet
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38 unresolved) */
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39
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40 public BasicBitType(Type underlyingType, int sizeInBits, int lsbOffset) {
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41 this(underlyingType, sizeInBits, lsbOffset, 0);
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42 }
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43
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44 private BasicBitType(Type underlyingType, int sizeInBits, int lsbOffset, int cvAttributes) {
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45 super(null, 0, false, cvAttributes);
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46 this.underlyingType = underlyingType;
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47 this.sizeInBits = sizeInBits;
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48 this.offset = lsbOffset;
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49 }
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50
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51 public BitType asBit() { return this; }
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52
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53 public int getSize() { return underlyingType.getSize(); }
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54 public boolean isUnsigned() {
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55 if (underlyingType.isInt()) {
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56 return ((IntType) underlyingType).isUnsigned();
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57 }
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58 return false;
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59 }
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60
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61 public int getSizeInBits() {
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62 return sizeInBits;
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63 }
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64
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65 public int getOffset() {
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66 return offset;
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67 }
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68
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69 Type resolveTypes(BasicCDebugInfoDataBase db, ResolveListener listener) {
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70 super.resolveTypes(db, listener);
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71 underlyingType = db.resolveType(this, underlyingType, listener, "resolving bit type");
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72 setName(underlyingType.getName());
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73 if (Assert.ASSERTS_ENABLED) {
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74 BasicType b = (BasicType) underlyingType;
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75 Assert.that(b.isLazy() || b.isInt(),
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76 "Underlying type of bitfield must be integer type (or unresolved due to error)");
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77 }
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78 return this;
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79 }
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80
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81 public void iterateObject(Address a, ObjectVisitor v, FieldIdentifier f) {
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82 long mask = maskFor(sizeInBits);
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83 long val = ((a.getCIntegerAt(0, getSize(), isUnsigned())) >> getOffset()) & mask;
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84 if (!isUnsigned()) {
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85 if ((val & highBit(sizeInBits)) != 0) {
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86 // Must sign extend
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87 val = val | (~mask);
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88 }
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89 }
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90 v.doBit(f, val);
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91 }
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92
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93 protected Type createCVVariant(int cvAttributes) {
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94 return new BasicBitType(underlyingType, getSizeInBits(), getOffset(), cvAttributes);
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95 }
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96
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97 public void visit(TypeVisitor v) {
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98 v.doBitType(this);
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99 }
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100
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101 private static long maskFor(int sizeInBits) {
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102 return ((1 << sizeInBits) - 1);
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103 }
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104
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105 private static long highBit(int sizeInBits) {
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106 return (1 << (sizeInBits - 1));
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107 }
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108 }
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