Mercurial > hg > truffle
diff agent/src/share/classes/sun/jvm/hotspot/runtime/JavaCallWrapper.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/agent/src/share/classes/sun/jvm/hotspot/runtime/JavaCallWrapper.java Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,75 @@ +/* + * 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())); + } + +}