StubRoutines.java revision 9883:903a2e023ffb 
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
25package sun.jvm.hotspot.runtime;
26
27import java.util.*;
28import sun.jvm.hotspot.debugger.*;
29import sun.jvm.hotspot.types.*;
30
31/** Very minimal port for now to get frames working */
32
33public class StubRoutines {
34  private static AddressField callStubReturnAddressField;
35
36  static {
37    VM.registerVMInitializedObserver(new Observer() {
38        public void update(Observable o, Object data) {
39          initialize(VM.getVM().getTypeDataBase());
40        }
41      });
42  }
43
44  private static synchronized void initialize(TypeDataBase db) {
45    Type type = db.lookupType("StubRoutines");
46    callStubReturnAddressField = type.getAddressField("_call_stub_return_address");
47  }
48
49  public StubRoutines() {
50  }
51
52  public boolean returnsToCallStub(Address returnPC) {
53    Address addr = callStubReturnAddressField.getValue();
54    if (addr == null) {
55      return (addr == returnPC);
56    } else {
57      return (addr.equals(returnPC));
58    }
59  }
60}
61