[aarch64-port-dev ] assertion failure bcp doesn't belong to this method

[Andrew Dinn]

On 19/02/14 14:08, D.Sturm wrote:
> Thank you very much for the pointers, they proved very helpful. 
> 
> I stepped through the code (ZoneFileInfo calling readUTF on a
> DataInputStream) and it works fine in the interpreter, so I guess this
> means it fails the first time it tries to compile the method or does
> some other special magic in the background. I used simbreakreloc for
> each of the methods on the callstack (although since I run with OSR
> disabled I'd expect this to only happen for DataInputStream.readUTF) but
> none trigger a break. simcompiled lists only adapter methods and one
> method from the Graal classes (the only java entry), but no new entries
> appear between me checking in the interpreter and after the assertion
> has been triggered.

i) how did you specify the name of the method to break?

You need to provide the name with fully package qualified class, method
and signature e.g.

simbreakreloc "java.lang.Object.<init>()V" 24

ii) did you provide an offset like 16 or 24?

iii) are you sure any method has actually been compiled -- it is not
always clear when C2 will kick in and compile something.

iv) it may be that the Graal compiler is not compiling code or is
installing the code via a different path. we hooked into the points
where native method instances and stubs are created/installed. look for
calls to simulator method notifyCompile in the hotspot/src/share tree
and see if it is actually being called. if it is step through and check
that the methods are being entered into the compiled method table. This
will also allow you to check the syntax used to name the method.

Also check that notifyRelocate is being called when the method is moved
into is executable code buffer (as opposed to the temporary buffer used
to generate the code). Break points only become live when te code has
been assembled and relocated.

> I'm still learning all the details of HotSpot and I'm not sure how to
> best approach such a problem, I'm pretty stumped on how to proceed here.

Well, hope the above helps.

regards,


Andrew Dinn
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Principal Software Engineer
Red Hat UK Ltd
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