Assembly output from JRuby 'fib'

[Mark Roos]

I have seen a stack map issue with ASM 4 as well.  In my case it was dead 
( unreachable ) code which had
a return instruction in it.  Seemed to confuse the next stack map 
computation.  I am allowing ASM 4 to compute
the maps on its own.

I replaced it (the return) with no ops and the problem went away.  The 
other dead instructions did not seem to 
matter.

mark



From:
Charles Oliver Nutter <headius at headius.com>
To:
Da Vinci Machine Project <mlvm-dev at openjdk.java.net>
Date:
04/28/2011 11:17 AM
Subject:
Re: Assembly output from JRuby 'fib'
Sent by:
mlvm-dev-bounces at openjdk.java.net



On Thu, Apr 28, 2011 at 11:03 AM, Rémi Forax <forax at univ-mlv.fr> wrote:
> On 04/28/2011 03:56 PM, Charles Oliver Nutter wrote:
>> stack map is invalid. Could be an ASM bug?
>
> yes. it could :)
>
> Also it could be a bug on your side because to calculate stackmap
> ASM needs to be able to find the common supertype of two types.
> I don't know if you provide your own method for doing that but
> by default it relies on reflection (getSupperClass/isAssignableFrom)
> which doesn't work if your code use a Class that doesn't exist yet.

If you're willing, I'll toss you 1.5 and 1.6 ASM-produced bytecode
off-list and perhaps you can help me figure out if I'm doing something
wrong or if ASM is choking on our peculiar code structure. I need this
working to start running tests with invokedynamic.

- Charlie
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