1 /*
   2  * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 package sun.jvm.hotspot.runtime;
  26 
  27 import java.io.*;
  28 import java.util.*;
  29 import sun.jvm.hotspot.debugger.*;
  30 import sun.jvm.hotspot.types.*;
  31 import sun.jvm.hotspot.ci.*;
  32 
  33 public class CompilerThread extends JavaThread {
  34   static {
  35     VM.registerVMInitializedObserver(new Observer() {
  36         public void update(Observable o, Object data) {
  37           initialize(VM.getVM().getTypeDataBase());
  38         }
  39       });
  40   }
  41 
  42   private static AddressField _env_field;
  43 
  44   private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
  45     Type type      = db.lookupType("CompilerThread");
  46 
  47     _env_field = type.getAddressField("_env");
  48   }
  49 
  50   private ciEnv _env;
  51 
  52   public synchronized ciEnv env() {
  53     if (_env == null) {
  54       Address v = _env_field.getValue(this.getAddress());
  55       if (v != null) {
  56         _env = new ciEnv(v);
  57       }
  58     }
  59     return _env;
  60   }
  61 
  62   public CompilerThread(Address addr) {
  63     super(addr);
  64   }
  65 
  66   public boolean isJavaThread() { return false; }
  67   public boolean isHiddenFromExternalView() { return true; }
  68   public boolean isCompilerThread() { return true; }
  69 
  70 }