Mercurial > hg > graal-compiler
view agent/src/share/classes/sun/jvm/hotspot/debugger/cdbg/basic/BasicBitType.java @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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/* * Copyright 2001 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.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)); } }