Mercurial > hg > graal-compiler
view agent/src/share/classes/sun/jvm/hotspot/utilities/Hashtable.java @ 17681:6037db01f9dd
8028623: SA: hash codes in SymbolTable mismatching java_lang_String::hash_code for extended characters.
Reviewed-by: sla, dsamersoff
author | kevinw |
---|---|
date | Fri, 17 Jan 2014 18:39:22 +0000 |
parents | b9a9ed0f8eeb |
children | 4ca6dc0799b6 |
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/* * Copyright (c) 2003, 2014, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.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("IntptrHashtable"); } // 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; // Emulate the unsigned int in java_lang_String::hash_code while (len-- > 0) { h = 31*h + (0xFFFFFFFFL & buf[s]); s++; } return h & 0xFFFFFFFFL; } }