author | jiangli |
Fri, 30 Jan 2015 20:31:05 -0500 | |
changeset 28822 | fa57694ade05 |
parent 22234 | da823d78ad65 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2015, 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.memory; |
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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.oops.*; |
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import sun.jvm.hotspot.types.*; |
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import sun.jvm.hotspot.runtime.*; |
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import sun.jvm.hotspot.utilities.*; |
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public class SymbolTable extends sun.jvm.hotspot.utilities.Hashtable { |
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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) { |
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Type type = db.lookupType("SymbolTable"); |
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theTableField = type.getAddressField("_the_table"); |
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sharedTableField = type.getAddressField("_shared_table"); |
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} |
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// Fields |
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private static AddressField theTableField; |
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private static AddressField sharedTableField; |
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private CompactHashTable sharedTable; |
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// Accessors |
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public static SymbolTable getTheTable() { |
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Address tmp = theTableField.getValue(); |
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SymbolTable table = (SymbolTable) VMObjectFactory.newObject(SymbolTable.class, tmp); |
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Address shared = sharedTableField.getStaticFieldAddress(); |
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table.sharedTable = (CompactHashTable)VMObjectFactory.newObject(CompactHashTable.class, shared); |
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return table; |
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} |
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public SymbolTable(Address addr) { |
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super(addr); |
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} |
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/** Clone of VM's "temporary" probe routine, as the SA currently |
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does not support mutation so lookup() would have no effect |
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anyway. Returns null if the given string is not in the symbol |
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table. */ |
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public Symbol probe(String name) { |
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try { |
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return probe(toModifiedUTF8Bytes(name)); |
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} catch (IOException e) { |
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return null; |
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} |
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} |
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/** Clone of VM's "temporary" probe routine, as the SA currently |
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does not support mutation so lookup() would have no effect |
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anyway. Searches the regular symbol table and the shared symbol |
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table. Null is returned if the given name is not found in both |
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tables. */ |
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public Symbol probe(byte[] name) { |
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long hashValue = hashSymbol(name); |
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for (HashtableEntry e = (HashtableEntry) bucket(hashToIndex(hashValue)); e != null; e = (HashtableEntry) e.next()) { |
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if (e.hash() == hashValue) { |
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Symbol sym = Symbol.create(e.literalValue()); |
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if (sym.equals(name)) { |
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return sym; |
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} |
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} |
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} |
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return sharedTable.probe(name, hashValue); |
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} |
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public interface SymbolVisitor { |
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public void visit(Symbol sym); |
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} |
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public void symbolsDo(SymbolVisitor visitor) { |
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int numBuckets = tableSize(); |
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for (int i = 0; i < numBuckets; i++) { |
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for (HashtableEntry e = (HashtableEntry) bucket(i); e != null; |
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e = (HashtableEntry) e.next()) { |
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visitor.visit(Symbol.create(e.literalValue())); |
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} |
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} |
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} |
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private static byte[] toModifiedUTF8Bytes(String name) throws IOException { |
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ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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DataOutputStream dos = new DataOutputStream(baos); |
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dos.writeUTF(name); |
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dos.flush(); |
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byte[] buf = baos.toByteArray(); |
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byte[] res = new byte[buf.length - 2]; |
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// skip the length part |
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System.arraycopy(buf, 2, res, 0, res.length); |
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return res; |
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} |
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} |