1 /* 2 * Copyright (c) 2000, 2017, 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 envField; 43 44 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException { 45 Type type = db.lookupType("CompilerThread"); 46 47 envField = type.getAddressField("_env"); 48 } 49 50 private ciEnv _env; 51 52 public synchronized ciEnv env() { 53 if (_env == null) { 54 Address v = envField.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 }