Subj : Re: Compile the Javascript code to Bytecode.
To   : netscape.public.mozilla.jseng
From : Alfred
Date : Mon Oct 03 2005 04:29 am

Hi Peter,
    It's great, I just wanted to dump the bytecode in human readable
format using Spidermonkey. Since you have done some of the work, I
think maybe I can do some help.

Regards

Alfred

Peter Paulus wrote:
> Hello Alfred,
>
> If you are Spidermonkey based, I've been doing some work on dumping the
> bytecode in human readable form. This is far from complete though. I did
> some investigation in this direction, but ceased work after only a few
> days. If you are interested I can send you my code.
>
> What is stored internally after you have compiled a script is bytecode.
> On the JSScript structure the 'code' field points into the bytecode. The
> 'length' member field tells you what size the bytecode has.
>
> The 'main' member field tells you where executable code starts.
>
> What I haven't figured out in this respect is where the table with
> constants, strings etc. is. I think this is behind the 'atomMap' member
> field.
>
> Files 'jsopcode.h' and 'jsopcode.tbl' give you a lot of hints about
> bytecode.
>
> If you are interested in dumping the bytecode octets in binary form, It
> should not be to hard to build that. Dumping 'length' bytes of the
> 'code' field get's you half way. You'd only have to figure out how to
> dump the atomMap.
> 
> Hope that helps,
> 
> With kind regards,
> Peter Paulus

.