| /* |
| * Copyright (c) 2001, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.debugger.cdbg.basic; |
| |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.debugger.cdbg.*; |
| import sun.jvm.hotspot.utilities.Assert; |
| |
| public class BasicBitType extends BasicIntType implements BitType { |
| // Integer type or lazy type |
| private Type underlyingType; |
| private int sizeInBits; |
| private int offset; |
| |
| /** Underlying type of enum must be an integer type (or as yet |
| unresolved) */ |
| |
| public BasicBitType(Type underlyingType, int sizeInBits, int lsbOffset) { |
| this(underlyingType, sizeInBits, lsbOffset, 0); |
| } |
| |
| private BasicBitType(Type underlyingType, int sizeInBits, int lsbOffset, int cvAttributes) { |
| super(null, 0, false, cvAttributes); |
| this.underlyingType = underlyingType; |
| this.sizeInBits = sizeInBits; |
| this.offset = lsbOffset; |
| } |
| |
| public BitType asBit() { return this; } |
| |
| public int getSize() { return underlyingType.getSize(); } |
| public boolean isUnsigned() { |
| if (underlyingType.isInt()) { |
| return ((IntType) underlyingType).isUnsigned(); |
| } |
| return false; |
| } |
| |
| public int getSizeInBits() { |
| return sizeInBits; |
| } |
| |
| public int getOffset() { |
| return offset; |
| } |
| |
| Type resolveTypes(BasicCDebugInfoDataBase db, ResolveListener listener) { |
| super.resolveTypes(db, listener); |
| underlyingType = db.resolveType(this, underlyingType, listener, "resolving bit type"); |
| setName(underlyingType.getName()); |
| if (Assert.ASSERTS_ENABLED) { |
| BasicType b = (BasicType) underlyingType; |
| Assert.that(b.isLazy() || b.isInt(), |
| "Underlying type of bitfield must be integer type (or unresolved due to error)"); |
| } |
| return this; |
| } |
| |
| public void iterateObject(Address a, ObjectVisitor v, FieldIdentifier f) { |
| long mask = maskFor(sizeInBits); |
| long val = ((a.getCIntegerAt(0, getSize(), isUnsigned())) >> getOffset()) & mask; |
| if (!isUnsigned()) { |
| if ((val & highBit(sizeInBits)) != 0) { |
| // Must sign extend |
| val = val | (~mask); |
| } |
| } |
| v.doBit(f, val); |
| } |
| |
| protected Type createCVVariant(int cvAttributes) { |
| return new BasicBitType(underlyingType, getSizeInBits(), getOffset(), cvAttributes); |
| } |
| |
| public void visit(TypeVisitor v) { |
| v.doBitType(this); |
| } |
| |
| private static long maskFor(int sizeInBits) { |
| return ((1 << sizeInBits) - 1); |
| } |
| |
| private static long highBit(int sizeInBits) { |
| return (1 << (sizeInBits - 1)); |
| } |
| } |