7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
Reviewed-by: kvn
/*
* Copyright (c) 2011, 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.
*
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package sun.jvm.hotspot.code;
import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
/** RicochetBlob (currently only used by Compiler 2) */
public class RicochetBlob extends SingletonBlob {
static {
VM.registerVMInitializedObserver(new Observer() {
public void update(Observable o, Object data) {
initialize(VM.getVM().getTypeDataBase());
}
});
}
private static void initialize(TypeDataBase db) {
Type type = db.lookupType("RicochetBlob");
bounceOffsetField = type.getCIntegerField("_bounce_offset");
exceptionOffsetField = type.getCIntegerField("_exception_offset");
}
private static CIntegerField bounceOffsetField;
private static CIntegerField exceptionOffsetField;
public RicochetBlob(Address addr) {
super(addr);
}
public boolean isRicochetBlob() {
return true;
}
public Address bounceAddr() {
return codeBegin().addOffsetTo(bounceOffsetField.getValue(addr));
}
public boolean returnsToBounceAddr(Address pc) {
Address bouncePc = bounceAddr();
return (pc.equals(bouncePc) || pc.addOffsetTo(Frame.pcReturnOffset()).equals(bouncePc));
}
}