Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/utilities/Hashtable.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/utilities/Hashtable.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,70 @@ +/* + * Copyright 2003 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.utilities; + +import java.util.*; +import sun.jvm.hotspot.debugger.*; +import sun.jvm.hotspot.types.*; +import sun.jvm.hotspot.runtime.*; + +public class Hashtable extends BasicHashtable { + static { + VM.registerVMInitializedObserver(new Observer() { + public void update(Observable o, Object data) { + initialize(VM.getVM().getTypeDataBase()); + } + }); + } + + private static synchronized void initialize(TypeDataBase db) { + // just to confirm that type exists + Type type = db.lookupType("Hashtable"); + } + + // derived class may return Class<? extends HashtableEntry> + protected Class getHashtableEntryClass() { + return HashtableEntry.class; + } + + public int hashToIndex(long fullHash) { + return (int) (fullHash % tableSize()); + } + + public Hashtable(Address addr) { + super(addr); + } + + // VM's Hashtable::hash_symbol + protected static long hashSymbol(byte[] buf) { + long h = 0; + int s = 0; + int len = buf.length; + while (len-- > 0) { + h = 31*h + (0xFFL & buf[s]); + s++; + } + return h & 0xFFFFFFFFL; + } +}