--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/memory/SymbolTable.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2001-2005 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.memory;
+
+import java.io.*;
+import java.util.*;
+import sun.jvm.hotspot.debugger.*;
+import sun.jvm.hotspot.oops.*;
+import sun.jvm.hotspot.types.*;
+import sun.jvm.hotspot.runtime.*;
+import sun.jvm.hotspot.utilities.*;
+
+public class SymbolTable extends sun.jvm.hotspot.utilities.Hashtable {
+  static {
+    VM.registerVMInitializedObserver(new Observer() {
+        public void update(Observable o, Object data) {
+          initialize(VM.getVM().getTypeDataBase());
+        }
+      });
+  }
+
+  private static synchronized void initialize(TypeDataBase db) {
+    Type type = db.lookupType("SymbolTable");
+    theTableField  = type.getAddressField("_the_table");
+    symbolTableSize = db.lookupIntConstant("SymbolTable::symbol_table_size").intValue();
+  }
+
+  // Fields
+  private static AddressField theTableField;
+  private static int symbolTableSize;
+
+  // Accessors
+  public static SymbolTable getTheTable() {
+    Address tmp = theTableField.getValue();
+    return (SymbolTable) VMObjectFactory.newObject(SymbolTable.class, tmp);
+  }
+
+  public static int getSymbolTableSize() {
+    return symbolTableSize;
+  }
+
+  public SymbolTable(Address addr) {
+    super(addr);
+  }
+
+  /** Clone of VM's "temporary" probe routine, as the SA currently
+      does not support mutation so lookup() would have no effect
+      anyway. Returns null if the given string is not in the symbol
+      table. */
+  public Symbol probe(String name) {
+    try {
+      return probe(toModifiedUTF8Bytes(name));
+    } catch (IOException e) {
+      return null;
+    }
+  }
+
+  /** Clone of VM's "temporary" probe routine, as the SA currently
+      does not support mutation so lookup() would have no effect
+      anyway. Returns null if the given string is not in the symbol
+      table. */
+  public Symbol probe(byte[] name) {
+    long hashValue = hashSymbol(name);
+    for (HashtableEntry e = (HashtableEntry) bucket(hashToIndex(hashValue)); e != null; e = (HashtableEntry) e.next()) {
+      if (e.hash() == hashValue) {
+         Symbol sym = (Symbol) e.literal();
+         if (sym.equals(name)) {
+           return sym;
+         }
+      }
+    }
+    return null;
+  }
+
+  public interface SymbolVisitor {
+    public void visit(Symbol sym);
+  }
+
+  public void symbolsDo(SymbolVisitor visitor) {
+    int numBuckets = tableSize();
+    for (int i = 0; i < numBuckets; i++) {
+      for (HashtableEntry e = (HashtableEntry) bucket(i); e != null;
+           e = (HashtableEntry) e.next()) {
+        visitor.visit((Symbol) e.literal());
+      }
+    }
+  }
+
+  private static byte[] toModifiedUTF8Bytes(String name) throws IOException {
+    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+    DataOutputStream dos = new DataOutputStream(baos);
+    dos.writeUTF(name);
+    dos.flush();
+    byte[] buf = baos.toByteArray();
+    byte[] res = new byte[buf.length - 2];
+    // skip the length part
+    System.arraycopy(buf, 2, res, 0, res.length);
+    return res;
+  }
+}