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/*
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* Copyright 2000-2005 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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package sun.jvm.hotspot.oops;
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import java.io.*;
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import java.util.*;
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import sun.jvm.hotspot.debugger.*;
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import sun.jvm.hotspot.runtime.*;
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import sun.jvm.hotspot.types.*;
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import sun.jvm.hotspot.utilities.*;
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// A ConstantPool is an array containing class constants
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// as described in the class file
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public class ConstantPool extends Array implements ClassConstants {
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// Used for debugging this code
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private static final boolean DEBUG = false;
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protected void debugMessage(String message) {
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System.out.println(message);
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}
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static {
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VM.registerVMInitializedObserver(new Observer() {
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public void update(Observable o, Object data) {
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initialize(VM.getVM().getTypeDataBase());
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}
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});
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}
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private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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Type type = db.lookupType("constantPoolOopDesc");
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tags = new OopField(type.getOopField("_tags"), 0);
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cache = new OopField(type.getOopField("_cache"), 0);
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poolHolder = new OopField(type.getOopField("_pool_holder"), 0);
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headerSize = type.getSize();
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elementSize = db.getOopSize();
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}
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ConstantPool(OopHandle handle, ObjectHeap heap) {
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super(handle, heap);
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}
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public boolean isConstantPool() { return true; }
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private static OopField tags;
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private static OopField cache;
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private static OopField poolHolder;
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private static long headerSize;
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private static long elementSize;
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public TypeArray getTags() { return (TypeArray) tags.getValue(this); }
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public ConstantPoolCache getCache() { return (ConstantPoolCache) cache.getValue(this); }
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public Klass getPoolHolder() { return (Klass) poolHolder.getValue(this); }
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private long indexOffset(long index) {
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(index > 0 && index < getLength(), "invalid cp index");
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}
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return (index * elementSize) + headerSize;
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}
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public ConstantTag getTagAt(long index) {
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return new ConstantTag(getTags().getByteAt((int) index));
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}
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public Oop getObjAt(long index){
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return getHeap().newOop(getHandle().getOopHandleAt(indexOffset(index)));
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}
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public Symbol getSymbolAt(long index) {
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return (Symbol) getObjAt(index);
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}
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public int getIntAt(long index){
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return getHandle().getJIntAt(indexOffset(index));
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}
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public float getFloatAt(long index){
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return getHandle().getJFloatAt(indexOffset(index));
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}
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public long getLongAt(long index) {
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int oneHalf = getHandle().getJIntAt(indexOffset(index + 1));
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int otherHalf = getHandle().getJIntAt(indexOffset(index));
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// buildLongFromIntsPD accepts higher address value, lower address value
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// in that order.
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return VM.getVM().buildLongFromIntsPD(oneHalf, otherHalf);
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}
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public double getDoubleAt(long index) {
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return Double.longBitsToDouble(getLongAt(index));
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}
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public int getFieldOrMethodAt(int which) {
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if (DEBUG) {
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System.err.print("ConstantPool.getFieldOrMethodAt(" + which + "): new index = ");
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}
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int i = -1;
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ConstantPoolCache cache = getCache();
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if (cache == null) {
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i = which;
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} else {
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// change byte-ordering and go via cache
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i = cache.getEntryAt(0xFFFF & VM.getVM().getBytes().swapShort((short) which)).getConstantPoolIndex();
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}
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(getTagAt(i).isFieldOrMethod(), "Corrupted constant pool");
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}
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if (DEBUG) {
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System.err.println(i);
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}
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int res = getIntAt(i);
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if (DEBUG) {
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System.err.println("ConstantPool.getFieldOrMethodAt(" + i + "): result = " + res);
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}
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return res;
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}
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public int getNameAndTypeAt(int which) {
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if (Assert.ASSERTS_ENABLED) {
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Assert.that(getTagAt(which).isNameAndType(), "Corrupted constant pool");
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}
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int i = getIntAt(which);
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if (DEBUG) {
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System.err.println("ConstantPool.getNameAndTypeAt(" + which + "): result = " + i);
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}
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return i;
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}
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public Symbol getNameRefAt(int which) {
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int refIndex = getNameAndTypeAt(getNameAndTypeRefIndexAt(which));
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int nameIndex = extractLowShortFromInt(refIndex);
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return getSymbolAt(nameIndex);
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}
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public Symbol getSignatureRefAt(int which) {
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int refIndex = getNameAndTypeAt(getNameAndTypeRefIndexAt(which));
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int sigIndex = extractHighShortFromInt(refIndex);
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return getSymbolAt(sigIndex);
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}
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// returns null, if not resolved.
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public Klass getKlassRefAt(int which) {
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if( ! getTagAt(which).isKlass()) return null;
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return (Klass) getObjAt(which);
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}
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// returns null, if not resolved.
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public InstanceKlass getFieldOrMethodKlassRefAt(int which) {
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int refIndex = getFieldOrMethodAt(which);
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int klassIndex = extractLowShortFromInt(refIndex);
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return (InstanceKlass) getKlassRefAt(klassIndex);
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}
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// returns null, if not resolved.
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public Method getMethodRefAt(int which) {
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InstanceKlass klass = getFieldOrMethodKlassRefAt(which);
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if (klass == null) return null;
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Symbol name = getNameRefAt(which);
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Symbol sig = getSignatureRefAt(which);
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return klass.findMethod(name, sig);
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}
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// returns null, if not resolved.
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public Field getFieldRefAt(int which) {
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InstanceKlass klass = getFieldOrMethodKlassRefAt(which);
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if (klass == null) return null;
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Symbol name = getNameRefAt(which);
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Symbol sig = getSignatureRefAt(which);
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return klass.findField(name, sig);
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}
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public int getNameAndTypeRefIndexAt(int index) {
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int refIndex = getFieldOrMethodAt(index);
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if (DEBUG) {
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System.err.println("ConstantPool.getNameAndTypeRefIndexAt(" + index + "): refIndex = " + refIndex);
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}
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int i = extractHighShortFromInt(refIndex);
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if (DEBUG) {
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System.err.println("ConstantPool.getNameAndTypeRefIndexAt(" + index + "): result = " + i);
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}
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return i;
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}
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/** Lookup for entries consisting of (name_index, signature_index) */
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public int getNameRefIndexAt(int index) {
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int refIndex = getNameAndTypeAt(index);
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if (DEBUG) {
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System.err.println("ConstantPool.getNameRefIndexAt(" + index + "): refIndex = " + refIndex);
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}
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int i = extractLowShortFromInt(refIndex);
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if (DEBUG) {
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System.err.println("ConstantPool.getNameRefIndexAt(" + index + "): result = " + i);
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}
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return i;
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}
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/** Lookup for entries consisting of (name_index, signature_index) */
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public int getSignatureRefIndexAt(int index) {
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int refIndex = getNameAndTypeAt(index);
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if (DEBUG) {
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System.err.println("ConstantPool.getSignatureRefIndexAt(" + index + "): refIndex = " + refIndex);
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}
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int i = extractHighShortFromInt(refIndex);
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if (DEBUG) {
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System.err.println("ConstantPool.getSignatureRefIndexAt(" + index + "): result = " + i);
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}
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return i;
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}
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final private static String[] nameForTag = new String[] {
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};
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private String nameForTag(int tag) {
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switch (tag) {
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case JVM_CONSTANT_Utf8: return "JVM_CONSTANT_Utf8";
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case JVM_CONSTANT_Unicode: return "JVM_CONSTANT_Unicode";
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case JVM_CONSTANT_Integer: return "JVM_CONSTANT_Integer";
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case JVM_CONSTANT_Float: return "JVM_CONSTANT_Float";
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case JVM_CONSTANT_Long: return "JVM_CONSTANT_Long";
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case JVM_CONSTANT_Double: return "JVM_CONSTANT_Double";
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case JVM_CONSTANT_Class: return "JVM_CONSTANT_Class";
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case JVM_CONSTANT_String: return "JVM_CONSTANT_String";
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case JVM_CONSTANT_Fieldref: return "JVM_CONSTANT_Fieldref";
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case JVM_CONSTANT_Methodref: return "JVM_CONSTANT_Methodref";
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case JVM_CONSTANT_InterfaceMethodref: return "JVM_CONSTANT_InterfaceMethodref";
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case JVM_CONSTANT_NameAndType: return "JVM_CONSTANT_NameAndType";
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case JVM_CONSTANT_Invalid: return "JVM_CONSTANT_Invalid";
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case JVM_CONSTANT_UnresolvedClass: return "JVM_CONSTANT_UnresolvedClass";
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case JVM_CONSTANT_ClassIndex: return "JVM_CONSTANT_ClassIndex";
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case JVM_CONSTANT_UnresolvedString: return "JVM_CONSTANT_UnresolvedString";
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case JVM_CONSTANT_StringIndex: return "JVM_CONSTANT_StringIndex";
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}
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throw new InternalError("unknown tag");
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}
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public void iterateFields(OopVisitor visitor, boolean doVMFields) {
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super.iterateFields(visitor, doVMFields);
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if (doVMFields) {
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visitor.doOop(tags, true);
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visitor.doOop(cache, true);
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visitor.doOop(poolHolder, true);
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final int length = (int) getLength();
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// zero'th pool entry is always invalid. ignore it.
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for (int index = 1; index < length; index++) {
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int ctag = (int) getTags().getByteAt((int) index);
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switch (ctag) {
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case JVM_CONSTANT_ClassIndex:
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case JVM_CONSTANT_StringIndex:
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case JVM_CONSTANT_Integer:
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visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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break;
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case JVM_CONSTANT_Float:
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visitor.doFloat(new FloatField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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break;
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case JVM_CONSTANT_Long:
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visitor.doLong(new LongField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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// long entries occupy two slots
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index++;
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break;
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case JVM_CONSTANT_Double:
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visitor.doDouble(new DoubleField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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// double entries occupy two slots
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index++;
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break;
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case JVM_CONSTANT_UnresolvedClass:
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case JVM_CONSTANT_Class:
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case JVM_CONSTANT_UnresolvedString:
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case JVM_CONSTANT_Utf8:
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visitor.doOop(new OopField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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break;
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case JVM_CONSTANT_Fieldref:
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case JVM_CONSTANT_Methodref:
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case JVM_CONSTANT_InterfaceMethodref:
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case JVM_CONSTANT_NameAndType:
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visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true);
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break;
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}
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}
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}
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/*
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int length = getLength();
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for (int index = 0; index < length; index++) {
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long offset = baseOffset + (index + typeDataBase.getOopSize());
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visitor.doOop(new IndexableField(index, offset, false), getObjAt(index));
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}
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*/
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}
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public void writeBytes(OutputStream os) throws IOException {
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// Map between any modified UTF-8 and it's constant pool index.
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Map utf8ToIndex = new HashMap();
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DataOutputStream dos = new DataOutputStream(os);
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TypeArray tags = getTags();
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int len = (int)getLength();
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int ci = 0; // constant pool index
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// collect all modified UTF-8 Strings from Constant Pool
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for (ci = 1; ci < len; ci++) {
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byte cpConstType = tags.getByteAt(ci);
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if(cpConstType == JVM_CONSTANT_Utf8) {
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Symbol sym = getSymbolAt(ci);
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utf8ToIndex.put(sym.asString(), new Short((short) ci));
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}
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else if(cpConstType == JVM_CONSTANT_Long ||
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cpConstType == JVM_CONSTANT_Double) {
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ci++;
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}
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}
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for(ci = 1; ci < len; ci++) {
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int cpConstType = (int)tags.getByteAt(ci);
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// write cp_info
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// write constant type
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switch(cpConstType) {
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case JVM_CONSTANT_Utf8: {
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dos.writeByte(cpConstType);
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Symbol sym = getSymbolAt(ci);
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dos.writeShort((short)sym.getLength());
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dos.write(sym.asByteArray());
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if (DEBUG) debugMessage("CP[" + ci + "] = modified UTF-8 " + sym.asString());
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break;
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}
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case JVM_CONSTANT_Unicode:
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throw new IllegalArgumentException("Unicode constant!");
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case JVM_CONSTANT_Integer:
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dos.writeByte(cpConstType);
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dos.writeInt(getIntAt(ci));
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if (DEBUG) debugMessage("CP[" + ci + "] = int " + getIntAt(ci));
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break;
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case JVM_CONSTANT_Float:
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dos.writeByte(cpConstType);
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dos.writeFloat(getFloatAt(ci));
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if (DEBUG) debugMessage("CP[" + ci + "] = float " + getFloatAt(ci));
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break;
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case JVM_CONSTANT_Long: {
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dos.writeByte(cpConstType);
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long l = getLongAt(ci);
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// long entries occupy two pool entries
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ci++;
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dos.writeLong(l);
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break;
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}
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case JVM_CONSTANT_Double:
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dos.writeByte(cpConstType);
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dos.writeDouble(getDoubleAt(ci));
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// double entries occupy two pool entries
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ci++;
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break;
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case JVM_CONSTANT_Class: {
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dos.writeByte(cpConstType);
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// Klass already resolved. ConstantPool constains klassOop.
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Klass refKls = (Klass) getObjAt(ci);
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String klassName = refKls.getName().asString();
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Short s = (Short) utf8ToIndex.get(klassName);
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dos.writeShort(s.shortValue());
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|
396 |
if (DEBUG) debugMessage("CP[" + ci + "] = class " + s);
|
|
397 |
break;
|
|
398 |
}
|
|
399 |
|
|
400 |
// case JVM_CONSTANT_ClassIndex:
|
|
401 |
case JVM_CONSTANT_UnresolvedClass: {
|
|
402 |
dos.writeByte(JVM_CONSTANT_Class);
|
|
403 |
String klassName = getSymbolAt(ci).asString();
|
|
404 |
Short s = (Short) utf8ToIndex.get(klassName);
|
|
405 |
dos.writeShort(s.shortValue());
|
|
406 |
if (DEBUG) debugMessage("CP[" + ci + "] = class " + s);
|
|
407 |
break;
|
|
408 |
}
|
|
409 |
|
|
410 |
case JVM_CONSTANT_String: {
|
|
411 |
dos.writeByte(cpConstType);
|
|
412 |
String str = OopUtilities.stringOopToString(getObjAt(ci));
|
|
413 |
Short s = (Short) utf8ToIndex.get(str);
|
|
414 |
dos.writeShort(s.shortValue());
|
|
415 |
if (DEBUG) debugMessage("CP[" + ci + "] = string " + s);
|
|
416 |
break;
|
|
417 |
}
|
|
418 |
|
|
419 |
// case JVM_CONSTANT_StringIndex:
|
|
420 |
case JVM_CONSTANT_UnresolvedString: {
|
|
421 |
dos.writeByte(JVM_CONSTANT_String);
|
|
422 |
String val = getSymbolAt(ci).asString();
|
|
423 |
|
|
424 |
Short s = (Short) utf8ToIndex.get(val);
|
|
425 |
dos.writeShort(s.shortValue());
|
|
426 |
if (DEBUG) debugMessage("CP[" + ci + "] = string " + s);
|
|
427 |
break;
|
|
428 |
}
|
|
429 |
|
|
430 |
// all external, internal method/field references
|
|
431 |
case JVM_CONSTANT_Fieldref:
|
|
432 |
case JVM_CONSTANT_Methodref:
|
|
433 |
case JVM_CONSTANT_InterfaceMethodref: {
|
|
434 |
dos.writeByte(cpConstType);
|
|
435 |
int value = getIntAt(ci);
|
|
436 |
short klassIndex = (short) extractLowShortFromInt(value);
|
|
437 |
short nameAndTypeIndex = (short) extractHighShortFromInt(value);
|
|
438 |
dos.writeShort(klassIndex);
|
|
439 |
dos.writeShort(nameAndTypeIndex);
|
|
440 |
if (DEBUG) debugMessage("CP[" + ci + "] = ref klass = " +
|
|
441 |
klassIndex + ", N&T = " + nameAndTypeIndex);
|
|
442 |
break;
|
|
443 |
}
|
|
444 |
|
|
445 |
case JVM_CONSTANT_NameAndType: {
|
|
446 |
dos.writeByte(cpConstType);
|
|
447 |
int value = getIntAt(ci);
|
|
448 |
short nameIndex = (short) extractLowShortFromInt(value);
|
|
449 |
short signatureIndex = (short) extractHighShortFromInt(value);
|
|
450 |
dos.writeShort(nameIndex);
|
|
451 |
dos.writeShort(signatureIndex);
|
|
452 |
if (DEBUG) debugMessage("CP[" + ci + "] = N&T name = " + nameIndex
|
|
453 |
+ ", type = " + signatureIndex);
|
|
454 |
break;
|
|
455 |
}
|
|
456 |
} // switch
|
|
457 |
}
|
|
458 |
dos.flush();
|
|
459 |
return;
|
|
460 |
}
|
|
461 |
|
|
462 |
public void printValueOn(PrintStream tty) {
|
|
463 |
tty.print("ConstantPool for " + getPoolHolder().getName().asString());
|
|
464 |
}
|
|
465 |
|
|
466 |
public long getObjectSize() {
|
|
467 |
return alignObjectSize(headerSize + (getLength() * elementSize));
|
|
468 |
}
|
|
469 |
|
|
470 |
//----------------------------------------------------------------------
|
|
471 |
// Internals only below this point
|
|
472 |
//
|
|
473 |
|
|
474 |
private static int extractHighShortFromInt(int val) {
|
|
475 |
return (val >> 16) & 0xFFFF;
|
|
476 |
}
|
|
477 |
|
|
478 |
private static int extractLowShortFromInt(int val) {
|
|
479 |
return val & 0xFFFF;
|
|
480 |
}
|
|
481 |
}
|