Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCache.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | ba764ed4b6f2 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/oops/ConstantPoolCache.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,100 @@ +/* + * Copyright 2000-2005 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.oops; + +import java.io.*; +import java.util.*; +import sun.jvm.hotspot.debugger.*; +import sun.jvm.hotspot.runtime.*; +import sun.jvm.hotspot.types.*; +import sun.jvm.hotspot.utilities.*; + +// A ConstantPool is an array containing class constants +// as described in the class file + +public class ConstantPoolCache extends Array { + static { + VM.registerVMInitializedObserver(new Observer() { + public void update(Observable o, Object data) { + initialize(VM.getVM().getTypeDataBase()); + } + }); + } + + private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { + Type type = db.lookupType("constantPoolCacheOopDesc"); + constants = new OopField(type.getOopField("_constant_pool"), 0); + baseOffset = type.getSize(); + + Type elType = db.lookupType("ConstantPoolCacheEntry"); + elementSize = elType.getSize(); + } + + ConstantPoolCache(OopHandle handle, ObjectHeap heap) { + super(handle, heap); + } + + public boolean isConstantPoolCache() { return true; } + + private static OopField constants; + + private static long baseOffset; + private static long elementSize; + + public ConstantPool getConstants() { return (ConstantPool) constants.getValue(this); } + + public long getObjectSize() { + return alignObjectSize(baseOffset + getLength() * elementSize); + } + + public ConstantPoolCacheEntry getEntryAt(int i) { + if (Assert.ASSERTS_ENABLED) { + Assert.that(0 <= i && i < getLength(), "index out of bounds"); + } + return new ConstantPoolCacheEntry(this, i); + } + + public int getIntAt(int entry, int fld) { + //alignObjectSize ? + long offset = baseOffset + /*alignObjectSize*/entry * elementSize + fld* getHeap().getIntSize(); + return (int) getHandle().getCIntegerAt(offset, getHeap().getIntSize(), true ); + } + + + public void printValueOn(PrintStream tty) { + tty.print("ConstantPoolCache for " + getConstants().getPoolHolder().getName().asString()); + } + + public void iterateFields(OopVisitor visitor, boolean doVMFields) { + super.iterateFields(visitor, doVMFields); + if (doVMFields) { + visitor.doOop(constants, true); + for (int i = 0; i < getLength(); i++) { + ConstantPoolCacheEntry entry = getEntryAt(i); + entry.iterateFields(visitor); + } + } + } +};