Re: [classlib][pack200] Status update - able to parse (some) bytecode now

["Geir Magnusson Jr." <ge...@pobox.com>]

On Feb 27, 2007, at 6:26 PM, Alex Blewitt wrote:

> On 20/02/07, Alex Blewitt <al...@gmail.com> wrote:
>> Good news everyone,
>>
>> I've just managed to decode a class file with its constituent  
>> bytecode
>> out to a Jar. There's a few bugs (it doesn't calculate the max stack)
>> and the byteccode is replaced with 'return' -- but that's only  
>> because
>> pack200 does some extra mangling on the bytecode (e.g. 'super()' is
>> normally 2 bytes, but it's so common that there's a special 1 byte
>> marker for it).
>
> I've addressed this issue, and I can now generate a subset of the
> bytecode (e.g. getstatic/putstatic/invokevirtual/areturn etc.) from an
> input pack file into an output Jar. There's still the tricky problem
> of the arguments; essentially, each argument type (e.g. methodref,
> classref, constant pool) is encoded in their own separate set of bands
> which I've yet to decode/overlay).
>
> So, whilst the EclipseCon deadline of a 'hello world' isn't that far
> off, it's only going to work with a particular special set of bytecode
> (though I should be able to change the message and re-run it to show
> it's not a pre-recorded demo). But I want to set everyone's
> expectations suitably low, because although I may have reached the
> peak of the complexity, I've still got to come down the other side and
> pick up all the remnants that are yet to be done. I don't see a full
> implementation any time soon -- and I've been off for about a week
> recently too.
>

Cool stuff.

> Whilst I'm at EclipseCon with the wireless, I'll spend some spare time
> creating/submitting a patch for the work that's done so far. I'll then
> be off for a holiday and will pick up the trail again towards the end
> of March ...

What, you take one vacation a month?  I wish I lived in the UK :)

geir

>
> Alex.

Re: [classlib][pack200] Status update - able to parse (some) bytecode now

[Alex Blewitt <al...@gmail.com>]

I wish. The last was 2 weeks business. This time, it's 1 week's
EclipseCon, 1 week's holiday, and I doubt I'm doing much in either of
those.

Alex.

On 02/03/07, Geir Magnusson Jr. <ge...@pobox.com> wrote:
>
> On Feb 27, 2007, at 6:26 PM, Alex Blewitt wrote:
>
> > On 20/02/07, Alex Blewitt <al...@gmail.com> wrote:
> >> Good news everyone,
> >>
> >> I've just managed to decode a class file with its constituent
> >> bytecode
> >> out to a Jar. There's a few bugs (it doesn't calculate the max stack)
> >> and the byteccode is replaced with 'return' -- but that's only
> >> because
> >> pack200 does some extra mangling on the bytecode (e.g. 'super()' is
> >> normally 2 bytes, but it's so common that there's a special 1 byte
> >> marker for it).
> >
> > I've addressed this issue, and I can now generate a subset of the
> > bytecode (e.g. getstatic/putstatic/invokevirtual/areturn etc.) from an
> > input pack file into an output Jar. There's still the tricky problem
> > of the arguments; essentially, each argument type (e.g. methodref,
> > classref, constant pool) is encoded in their own separate set of bands
> > which I've yet to decode/overlay).
> >
> > So, whilst the EclipseCon deadline of a 'hello world' isn't that far
> > off, it's only going to work with a particular special set of bytecode
> > (though I should be able to change the message and re-run it to show
> > it's not a pre-recorded demo). But I want to set everyone's
> > expectations suitably low, because although I may have reached the
> > peak of the complexity, I've still got to come down the other side and
> > pick up all the remnants that are yet to be done. I don't see a full
> > implementation any time soon -- and I've been off for about a week
> > recently too.
> >
>
> Cool stuff.
>
> > Whilst I'm at EclipseCon with the wireless, I'll spend some spare time
> > creating/submitting a patch for the work that's done so far. I'll then
> > be off for a holiday and will pick up the trail again towards the end
> > of March ...
>
> What, you take one vacation a month?  I wish I lived in the UK :)
>
> geir
>
> >
> > Alex.
>
>