author | never |
Thu, 21 Jul 2011 08:38:25 -0700 | |
changeset 10251 | 71b8938a2821 |
parent 7662 | 5f31baaff55b |
child 13728 | 882756847a04 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2011, 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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// ConstantPoolCache : A constant pool cache (constantPoolCacheOopDesc). |
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// See cpCacheOop.hpp for details about this class. |
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// |
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public class ConstantPoolCache extends Oop { |
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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("constantPoolCacheOopDesc"); |
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constants = new OopField(type.getOopField("_constant_pool"), 0); |
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baseOffset = type.getSize(); |
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Type elType = db.lookupType("ConstantPoolCacheEntry"); |
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elementSize = elType.getSize(); |
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length = new CIntField(type.getCIntegerField("_length"), 0); |
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} |
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ConstantPoolCache(OopHandle handle, ObjectHeap heap) { |
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super(handle, heap); |
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} |
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public boolean isConstantPoolCache() { return true; } |
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private static OopField constants; |
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private static long baseOffset; |
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private static long elementSize; |
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private static CIntField length; |
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public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); } |
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public long getObjectSize() { |
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return alignObjectSize(baseOffset + getLength() * elementSize); |
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} |
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public ConstantPoolCacheEntry getEntryAt(int i) { |
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if (i < 0 || i >= getLength()) throw new IndexOutOfBoundsException(i + " " + getLength()); |
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return new ConstantPoolCacheEntry(this, i); |
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} |
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public static boolean isSecondaryIndex(int i) { return (i < 0); } |
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public static int decodeSecondaryIndex(int i) { return isSecondaryIndex(i) ? ~i : i; } |
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public static int encodeSecondaryIndex(int i) { return !isSecondaryIndex(i) ? ~i : i; } |
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// secondary entries hold invokedynamic call site bindings |
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public ConstantPoolCacheEntry getSecondaryEntryAt(int i) { |
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int rawIndex = i; |
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if (isSecondaryIndex(i)) { |
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rawIndex = decodeSecondaryIndex(i); |
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} |
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ConstantPoolCacheEntry e = getEntryAt(rawIndex); |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(e.isSecondaryEntry(), "must be a secondary entry:" + rawIndex); |
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} |
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return e; |
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} |
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public ConstantPoolCacheEntry getMainEntryAt(int i) { |
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int primaryIndex = i; |
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if (isSecondaryIndex(i)) { |
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// run through an extra level of indirection: |
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int rawIndex = decodeSecondaryIndex(i); |
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primaryIndex = getEntryAt(rawIndex).getMainEntryIndex(); |
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} |
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ConstantPoolCacheEntry e = getEntryAt(primaryIndex); |
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if (Assert.ASSERTS_ENABLED) { |
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Assert.that(!e.isSecondaryEntry(), "must not be a secondary entry:" + primaryIndex); |
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} |
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return e; |
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} |
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public int getIntAt(int entry, int fld) { |
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//alignObjectSize ? |
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long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize(); |
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return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true ); |
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} |
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public void printValueOn(PrintStream tty) { |
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tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString()); |
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} |
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public int getLength() { |
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return (int) length.getValue(this); |
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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(constants, true); |
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for (int i = 0; i < getLength(); i++) { |
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ConstantPoolCacheEntry entry = getEntryAt(i); |
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entry.iterateFields(visitor); |
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} |
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} |
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} |
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}; |