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From "Mikhail Fursov" <mike.fur...@gmail.com>
Subject Re: [doc] are KNOWN ISSUES and TODO items valid?
Date Tue, 12 Dec 2006 16:18:50 GMT
Are there any samples to reproduce JIT problem? If not I can look through
my archives..

On 12 Dec 2006 19:55:54 +0600, Egor Pasko <egor.pasko@gmail.com> wrote:
>
> On the 0x23C day of Apache Harmony Alexey Varlamov wrote:
> > 11 Dec 2006 21:20:23 +0600, Egor Pasko <egor.pasko@gmail.com>:
> > > On the 0x23A day of Apache Harmony Alexey Varlamov wrote:
> > > > I've looked through "Known issues" page and dropped few items, which
> > > > were resolved already:
> > > > - Java assertions support
> > > > - StackOverflowError support for JIT mode
> > >
> > > why?
> > > we do not have SOE 100% safe yet, JIT algorithms can be caught with
> > > SOE on large bytecodes. We should estimate how much stack we can take
> > > before each graph traversal activity. Not done yet and leads to a
> crash.
> > >
> > The difference is, a technical imperfection vs missing feature (which
> > was originally listed) - so feel free to add a detailed TODO record
> > instead.
>
> fine,
>
> I made a JIT task from that under the new chapter "JIT Stability":
>
> 4. Avoiding stack overflow in JIT C++ code
>
> Problem: If compiled method's size is large or in case of aggressive
> inlining parameters are set in Jitrino.OPT the latter can crash with
> stack overflow while recursively traversing the CFG (=Control Flow
> Graph).
>
> Task: To avoid stack overflows, estimate the amount of space allocated
> by each optimization stage, check that it does not exceed the
> available free space on the stack. VM provides necessary functionality
> to check that via VM helper function get_available_stack_size(). In
> dangerous situations stop inlining or return JIT_FAILURE so that other
> JITs (for example, Jitrino.JET) can pick the compilation task.
>
> http://wiki.apache.org/harmony/JIT_Development_Tasks
>
> if there is a JIRA issue for that, feel free to add a reference.
>
> --
> Egor Pasko
>
>


-- 
Mikhail Fursov

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