Mercurial > hg > truffle
view agent/src/share/classes/sun/jvm/hotspot/runtime/JavaCallWrapper.java @ 669:eca19a8425b5
6810653: Change String cache class used by Hotspot from String to StringValue
Summary: Change create_vm() to load and initialize StringValue rather than String.
Reviewed-by: kvn
author | phh |
---|---|
date | Tue, 24 Mar 2009 21:56:53 -0400 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2000-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.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())); } }