Few questions about invokeDynamic

[Christian Thalinger]

On Nov 9, 2010, at 9:33 AM, Rémi Forax wrote:
>  Le 09/11/2010 08:53, Christian Thalinger a écrit :
>> On Nov 8, 2010, at 11:46 PM, Rémi Forax wrote:
>>> But sadly, it crashes the VM.
>>> The test case below reproduces the bug.
>> I haven't tried yet but I guess it crashes in compiled code?
>>
>> -- Christian
>
> yes, no problem with the interpreter.


A debug build hits this assert:

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/methodHandleWalk.cpp: 
262
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========================================================================
Unexpected Error
------------------------------------------------------------------------------
Internal Error at methodHandleWalk.cpp:262, pid=17691, tid=7
assert(false) failed: IMPLEMENT ME

Do you want to debug the problem?

To debug, run 'dbx - 17691'; then switch to thread 7
Enter 'yes' to launch dbx automatically (PATH must include dbx)
Otherwise, press RETURN to abort...
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========================================================================

The reason for that is an unimplemented path in the MethodHandleWalker  
handling return-type conversion for raw-retypes.  What's odd here is:

(dbx) p inrbt
inrbt = T_VOID
(dbx) p outrbt
outrbt = T_INT

The incoming return-type is void but the outgoing should be int.

-- Christian