1 /*
 2  * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 3  * Copyright (c) 2015, Red Hat Inc.
 4  * Copyright (c) 2021, Huawei Technologies Co., Ltd. All rights reserved.
 5  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 6  *
 7  * This code is free software; you can redistribute it and/or modify it
 8  * under the terms of the GNU General Public License version 2 only, as
 9  * published by the Free Software Foundation.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  *
25  */
26 
27 package sun.jvm.hotspot.runtime.riscv64;
28 
29 import java.util.*;
30 import sun.jvm.hotspot.debugger.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.runtime.*;
33 import sun.jvm.hotspot.utilities.*;
34 import sun.jvm.hotspot.utilities.Observable;
35 import sun.jvm.hotspot.utilities.Observer;
36 
37 public class RISCV64JavaCallWrapper extends JavaCallWrapper {
38   private static AddressField lastJavaFPField;
39 
40   static {
41     VM.registerVMInitializedObserver(new Observer() {
42         public void update(Observable o, Object data) {
43           initialize(VM.getVM().getTypeDataBase());
44         }
45       });
46   }
47 
48   private static synchronized void initialize(TypeDataBase db) {
49     Type type = db.lookupType("JavaFrameAnchor");
50 
51     lastJavaFPField  = type.getAddressField("_last_Java_fp");
52   }
53 
54   public RISCV64JavaCallWrapper(Address addr) {
55     super(addr);
56   }
57 
58   public Address getLastJavaFP() {
59     return lastJavaFPField.getValue(addr.addOffsetTo(anchorField.getOffset()));
60   }
61 }