RE: [dsdp-mtj-dev] Preverification support on MTJ

["Hildum Eric-XFQ473" <XFQ473@xxxxxxxxxxxx>]

I have recently heard that the Java 6 compiler contains the capability
to build preverfied code directly through compile time switches. I am
not sure if this capability may help us. If this capability is also
built into the Eclipse Java compiler, then we may be able to sidestep
the preverifier completely. That would clear the way for Mac and Linux
support in MTJ.


Eric Hildum
Senior Product Manager, Mobile Developer Tools & SDK
Software Platforms and Delivery
Ecosystem and Market Development
Motorola
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-----Original Message-----
From: dsdp-mtj-dev-bounces@xxxxxxxxxxx
[mailto:dsdp-mtj-dev-bounces@xxxxxxxxxxx] On Behalf Of Craig Setera
Sent: Sunday, May 11, 2008 19:13
To: Mobile Tools for The Java Platform mailing list
Subject: Re: [dsdp-mtj-dev] Preverification support on MTJ

Eric,

Sorry for not getting a response back on this for a while.  Part of it
is that I've been busy and part was that I was doing a bit of
experimenting.

On Apr 28, 2008, at 11:30 AM, Hildum Eric-XFQ473 wrote:

> I have two questions for multiplatform support:
>
> 1. Is it just the preverifier that is the issue, or are there other 
> components we need to worry about as well?
>

Given projects like MPowerPlayer and microemu, Mac has basic emulation  
functionality.  These emulators are limited in their JSR support, but  
are probably "good enough" for now.  The problem does tend to be with  
the preverifier.

> 2. Should we ask Sun if the existing PhoneME preverifier can also be  
> released as EPL code within MTJ?
>

You can ask, but my guess is that they will say that it is already  
"open source".  The problem is that it is GPL.

> My thought is we must have Windows, Linux, and Mac support in MTJ,  
> the real question is the best way to get there (fast).....
>

I agree.  I did some experimentation and found that building the  
preverifier from source for the Mac was not terribly difficult.  This  
might be a reasonable starting point... I can always provide it as a  
download for people to avoid EPL licensing issues with the GPL code.   
To make user of this, it would be necessary to allow an arbitrary  
external preverifier to be associated with mpowerplayer and microemu  
projects.  This is not supported by the EclipseME code on which MTJ is  
based.  The best thing we could do would be to allow the user to  
choose an external preverifier or the built-in preverifier for *any*  
device.

In terms of the built-in preverifier, I had a quick look at ASM 3.0 in  
the process of doing something else for work.  It appears there are  
actually some better API's in there that could be used to "fix up" the  
current implementation.  Unfortunately, that may not be doable in the  
short term.

In summary... I think there are some reasonable options for Mac, but  
one of them is going to force the user through more hoops and the  
other requires more work on MTJ part.

Craig
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