| /* |
| * Copyright (c) 2000, 2005, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.runtime; |
| |
| import java.util.*; |
| import sun.jvm.hotspot.debugger.*; |
| import sun.jvm.hotspot.types.*; |
| |
| /** <P> A JavaCallWrapper is constructed before each JavaCall and |
| destroyed after the call. Its purpose is to allocate/deallocate a |
| new handle block and to save/restore the last Java fp/sp. A |
| pointer to the JavaCallWrapper is stored on the stack. </P> |
| |
| <P> NOTE: this port is very minimal and is only designed to get |
| frame traversal working. FIXME: we will have to add platform- |
| specific stuff later and therefore a factory for these |
| objects. </P> */ |
| |
| public class JavaCallWrapper extends VMObject { |
| protected static AddressField anchorField; |
| private static AddressField lastJavaSPField; |
| private static AddressField lastJavaPCField; |
| |
| 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("JavaCallWrapper"); |
| Type anchorType = db.lookupType("JavaFrameAnchor"); |
| |
| anchorField = type.getAddressField("_anchor"); |
| lastJavaSPField = anchorType.getAddressField("_last_Java_sp"); |
| lastJavaPCField = anchorType.getAddressField("_last_Java_pc"); |
| } |
| |
| public JavaCallWrapper(Address addr) { |
| super(addr); |
| } |
| |
| public Address getLastJavaSP() { |
| return lastJavaSPField.getValue(addr.addOffsetTo(anchorField.getOffset())); |
| } |
| |
| public Address getLastJavaPC() { |
| return lastJavaPCField.getValue(addr.addOffsetTo(anchorField.getOffset())); |
| } |
| |
| } |