author | trims |
Thu, 27 May 2010 19:08:38 -0700 | |
changeset 5547 | f4b087cbb361 |
parent 5341 | 290a02b4adb3 |
child 5882 | 6b2aecc4f7d8 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2000, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* 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 oop containing class constants |
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// as described in the class file |
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public class ConstantPool extends Oop 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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length = new CIntField(type.getCIntegerField("_length"), 0); |
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headerSize = type.getSize(); |
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elementSize = 0; |
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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 CIntField length; // number of elements in oop |
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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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public int getLength() { return (int)length.getValue(this); } |
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private long getElementSize() { |
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if (elementSize !=0 ) { |
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return elementSize; |
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} else { |
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elementSize = VM.getVM().getOopSize(); |
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} |
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return elementSize; |
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} |
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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 " + index + " " + getLength()); |
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} |
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return (index * getElementSize()) + 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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178 |
// 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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221 |
/** 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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247 |
final private static String[] nameForTag = new String[] { |
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248 |
}; |
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249 |
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250 |
private String nameForTag(int tag) { |
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switch (tag) { |
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252 |
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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260 |
case JVM_CONSTANT_Fieldref: return "JVM_CONSTANT_Fieldref"; |
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case JVM_CONSTANT_Methodref: return "JVM_CONSTANT_Methodref"; |
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262 |
case JVM_CONSTANT_InterfaceMethodref: return "JVM_CONSTANT_InterfaceMethodref"; |
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case JVM_CONSTANT_NameAndType: return "JVM_CONSTANT_NameAndType"; |
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264 |
case JVM_CONSTANT_Invalid: return "JVM_CONSTANT_Invalid"; |
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265 |
case JVM_CONSTANT_UnresolvedClass: return "JVM_CONSTANT_UnresolvedClass"; |
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case JVM_CONSTANT_UnresolvedClassInError: return "JVM_CONSTANT_UnresolvedClassInError"; |
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case JVM_CONSTANT_ClassIndex: return "JVM_CONSTANT_ClassIndex"; |
268 |
case JVM_CONSTANT_UnresolvedString: return "JVM_CONSTANT_UnresolvedString"; |
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269 |
case JVM_CONSTANT_StringIndex: return "JVM_CONSTANT_StringIndex"; |
|
270 |
} |
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5341 | 271 |
throw new InternalError("Unknown tag: " + tag); |
1 | 272 |
} |
273 |
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274 |
public void iterateFields(OopVisitor visitor, boolean doVMFields) { |
|
275 |
super.iterateFields(visitor, doVMFields); |
|
276 |
if (doVMFields) { |
|
277 |
visitor.doOop(tags, true); |
|
278 |
visitor.doOop(cache, true); |
|
279 |
visitor.doOop(poolHolder, true); |
|
280 |
||
281 |
final int length = (int) getLength(); |
|
282 |
// zero'th pool entry is always invalid. ignore it. |
|
283 |
for (int index = 1; index < length; index++) { |
|
284 |
int ctag = (int) getTags().getByteAt((int) index); |
|
285 |
switch (ctag) { |
|
286 |
case JVM_CONSTANT_ClassIndex: |
|
287 |
case JVM_CONSTANT_StringIndex: |
|
288 |
case JVM_CONSTANT_Integer: |
|
289 |
visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); |
|
290 |
break; |
|
291 |
||
292 |
case JVM_CONSTANT_Float: |
|
293 |
visitor.doFloat(new FloatField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); |
|
294 |
break; |
|
295 |
||
296 |
case JVM_CONSTANT_Long: |
|
297 |
visitor.doLong(new LongField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); |
|
298 |
// long entries occupy two slots |
|
299 |
index++; |
|
300 |
break; |
|
301 |
||
302 |
case JVM_CONSTANT_Double: |
|
303 |
visitor.doDouble(new DoubleField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); |
|
304 |
// double entries occupy two slots |
|
305 |
index++; |
|
306 |
break; |
|
307 |
||
5341 | 308 |
case JVM_CONSTANT_UnresolvedClassInError: |
1 | 309 |
case JVM_CONSTANT_UnresolvedClass: |
310 |
case JVM_CONSTANT_Class: |
|
311 |
case JVM_CONSTANT_UnresolvedString: |
|
312 |
case JVM_CONSTANT_Utf8: |
|
313 |
visitor.doOop(new OopField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); |
|
314 |
break; |
|
315 |
||
316 |
case JVM_CONSTANT_Fieldref: |
|
317 |
case JVM_CONSTANT_Methodref: |
|
318 |
case JVM_CONSTANT_InterfaceMethodref: |
|
319 |
case JVM_CONSTANT_NameAndType: |
|
320 |
visitor.doInt(new IntField(new NamedFieldIdentifier(nameForTag(ctag)), indexOffset(index), true), true); |
|
321 |
break; |
|
322 |
} |
|
323 |
} |
|
324 |
} |
|
325 |
/* |
|
326 |
int length = getLength(); |
|
327 |
for (int index = 0; index < length; index++) { |
|
328 |
long offset = baseOffset + (index + typeDataBase.getOopSize()); |
|
329 |
visitor.doOop(new IndexableField(index, offset, false), getObjAt(index)); |
|
330 |
} |
|
331 |
*/ |
|
332 |
} |
|
333 |
||
334 |
public void writeBytes(OutputStream os) throws IOException { |
|
335 |
// Map between any modified UTF-8 and it's constant pool index. |
|
336 |
Map utf8ToIndex = new HashMap(); |
|
337 |
DataOutputStream dos = new DataOutputStream(os); |
|
338 |
TypeArray tags = getTags(); |
|
339 |
int len = (int)getLength(); |
|
340 |
int ci = 0; // constant pool index |
|
341 |
||
342 |
// collect all modified UTF-8 Strings from Constant Pool |
|
343 |
||
344 |
for (ci = 1; ci < len; ci++) { |
|
345 |
byte cpConstType = tags.getByteAt(ci); |
|
346 |
if(cpConstType == JVM_CONSTANT_Utf8) { |
|
347 |
Symbol sym = getSymbolAt(ci); |
|
348 |
utf8ToIndex.put(sym.asString(), new Short((short) ci)); |
|
349 |
} |
|
350 |
else if(cpConstType == JVM_CONSTANT_Long || |
|
351 |
cpConstType == JVM_CONSTANT_Double) { |
|
352 |
ci++; |
|
353 |
} |
|
354 |
} |
|
355 |
||
356 |
||
357 |
for(ci = 1; ci < len; ci++) { |
|
358 |
int cpConstType = (int)tags.getByteAt(ci); |
|
359 |
// write cp_info |
|
360 |
// write constant type |
|
361 |
switch(cpConstType) { |
|
362 |
case JVM_CONSTANT_Utf8: { |
|
363 |
dos.writeByte(cpConstType); |
|
364 |
Symbol sym = getSymbolAt(ci); |
|
365 |
dos.writeShort((short)sym.getLength()); |
|
366 |
dos.write(sym.asByteArray()); |
|
367 |
if (DEBUG) debugMessage("CP[" + ci + "] = modified UTF-8 " + sym.asString()); |
|
368 |
break; |
|
369 |
} |
|
370 |
||
371 |
case JVM_CONSTANT_Unicode: |
|
372 |
throw new IllegalArgumentException("Unicode constant!"); |
|
373 |
||
374 |
case JVM_CONSTANT_Integer: |
|
375 |
dos.writeByte(cpConstType); |
|
376 |
dos.writeInt(getIntAt(ci)); |
|
377 |
if (DEBUG) debugMessage("CP[" + ci + "] = int " + getIntAt(ci)); |
|
378 |
break; |
|
379 |
||
380 |
case JVM_CONSTANT_Float: |
|
381 |
dos.writeByte(cpConstType); |
|
382 |
dos.writeFloat(getFloatAt(ci)); |
|
383 |
if (DEBUG) debugMessage("CP[" + ci + "] = float " + getFloatAt(ci)); |
|
384 |
break; |
|
385 |
||
386 |
case JVM_CONSTANT_Long: { |
|
387 |
dos.writeByte(cpConstType); |
|
388 |
long l = getLongAt(ci); |
|
389 |
// long entries occupy two pool entries |
|
390 |
ci++; |
|
391 |
dos.writeLong(l); |
|
392 |
break; |
|
393 |
} |
|
394 |
||
395 |
case JVM_CONSTANT_Double: |
|
396 |
dos.writeByte(cpConstType); |
|
397 |
dos.writeDouble(getDoubleAt(ci)); |
|
398 |
// double entries occupy two pool entries |
|
399 |
ci++; |
|
400 |
break; |
|
401 |
||
402 |
case JVM_CONSTANT_Class: { |
|
403 |
dos.writeByte(cpConstType); |
|
404 |
// Klass already resolved. ConstantPool constains klassOop. |
|
405 |
Klass refKls = (Klass) getObjAt(ci); |
|
406 |
String klassName = refKls.getName().asString(); |
|
407 |
Short s = (Short) utf8ToIndex.get(klassName); |
|
408 |
dos.writeShort(s.shortValue()); |
|
409 |
if (DEBUG) debugMessage("CP[" + ci + "] = class " + s); |
|
410 |
break; |
|
411 |
} |
|
412 |
||
413 |
// case JVM_CONSTANT_ClassIndex: |
|
5341 | 414 |
case JVM_CONSTANT_UnresolvedClassInError: |
1 | 415 |
case JVM_CONSTANT_UnresolvedClass: { |
416 |
dos.writeByte(JVM_CONSTANT_Class); |
|
417 |
String klassName = getSymbolAt(ci).asString(); |
|
418 |
Short s = (Short) utf8ToIndex.get(klassName); |
|
419 |
dos.writeShort(s.shortValue()); |
|
420 |
if (DEBUG) debugMessage("CP[" + ci + "] = class " + s); |
|
421 |
break; |
|
422 |
} |
|
423 |
||
424 |
case JVM_CONSTANT_String: { |
|
425 |
dos.writeByte(cpConstType); |
|
426 |
String str = OopUtilities.stringOopToString(getObjAt(ci)); |
|
427 |
Short s = (Short) utf8ToIndex.get(str); |
|
428 |
dos.writeShort(s.shortValue()); |
|
429 |
if (DEBUG) debugMessage("CP[" + ci + "] = string " + s); |
|
430 |
break; |
|
431 |
} |
|
432 |
||
433 |
// case JVM_CONSTANT_StringIndex: |
|
434 |
case JVM_CONSTANT_UnresolvedString: { |
|
435 |
dos.writeByte(JVM_CONSTANT_String); |
|
436 |
String val = getSymbolAt(ci).asString(); |
|
437 |
||
438 |
Short s = (Short) utf8ToIndex.get(val); |
|
439 |
dos.writeShort(s.shortValue()); |
|
440 |
if (DEBUG) debugMessage("CP[" + ci + "] = string " + s); |
|
441 |
break; |
|
442 |
} |
|
443 |
||
444 |
// all external, internal method/field references |
|
445 |
case JVM_CONSTANT_Fieldref: |
|
446 |
case JVM_CONSTANT_Methodref: |
|
447 |
case JVM_CONSTANT_InterfaceMethodref: { |
|
448 |
dos.writeByte(cpConstType); |
|
449 |
int value = getIntAt(ci); |
|
450 |
short klassIndex = (short) extractLowShortFromInt(value); |
|
451 |
short nameAndTypeIndex = (short) extractHighShortFromInt(value); |
|
452 |
dos.writeShort(klassIndex); |
|
453 |
dos.writeShort(nameAndTypeIndex); |
|
454 |
if (DEBUG) debugMessage("CP[" + ci + "] = ref klass = " + |
|
455 |
klassIndex + ", N&T = " + nameAndTypeIndex); |
|
456 |
break; |
|
457 |
} |
|
458 |
||
459 |
case JVM_CONSTANT_NameAndType: { |
|
460 |
dos.writeByte(cpConstType); |
|
461 |
int value = getIntAt(ci); |
|
462 |
short nameIndex = (short) extractLowShortFromInt(value); |
|
463 |
short signatureIndex = (short) extractHighShortFromInt(value); |
|
464 |
dos.writeShort(nameIndex); |
|
465 |
dos.writeShort(signatureIndex); |
|
466 |
if (DEBUG) debugMessage("CP[" + ci + "] = N&T name = " + nameIndex |
|
467 |
+ ", type = " + signatureIndex); |
|
468 |
break; |
|
469 |
} |
|
5341 | 470 |
default: |
471 |
throw new InternalError("unknown tag: " + cpConstType); |
|
1 | 472 |
} // switch |
473 |
} |
|
474 |
dos.flush(); |
|
475 |
return; |
|
476 |
} |
|
477 |
||
478 |
public void printValueOn(PrintStream tty) { |
|
479 |
tty.print("ConstantPool for " + getPoolHolder().getName().asString()); |
|
480 |
} |
|
481 |
||
482 |
public long getObjectSize() { |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
483 |
return alignObjectSize(headerSize + (getLength() * getElementSize())); |
1 | 484 |
} |
485 |
||
486 |
//---------------------------------------------------------------------- |
|
487 |
// Internals only below this point |
|
488 |
// |
|
489 |
||
490 |
private static int extractHighShortFromInt(int val) { |
|
491 |
return (val >> 16) & 0xFFFF; |
|
492 |
} |
|
493 |
||
494 |
private static int extractLowShortFromInt(int val) { |
|
495 |
return val & 0xFFFF; |
|
496 |
} |
|
497 |
} |