Parrot embedding system

Jeff Horwitz jeff at
Wed Jul 29 13:38:04 UTC 2009

On Wed, 29 Jul 2009, Radovan Baranec wrote:

> Hi,
> I am very interesting in Parrot embedding system it is part of my diploma 
> project "The assessment of appropriateness of using virtual machines to 
> decode packets". I`d like to ask how to pass arguments from C to Parrot 
> subroutines? What is the best a most comfortable way? I will appreciate some 
> examples.

take a look at docs/embed.pod -- it has documentation on the functions 
you'd be using, in particular the Parrot_call_sub family of functions. 
you pass the subroutine name, a type signature for the arguments, and the 
arguments themselves.

you can find examples in t/src/extend.t and t/src/embed.t, as well as 
real-world usage in the mod_parrot source in src/parrot_util.c 
(svn repo at

> I am also thinking about which data structure should I use to store/represent 
> packet in PIR. If you have had ever meet this problem or solution pls let me 
> know. Thanks.

you can store the raw data in a PMC (very simple if you pass it as an 
argument from C), and/or your could break it out into an object (also a 
PMC).  you can do this from C or PIR.  it all depends on how and where you 
plan on using the data.

> btw: this is my first mailing list ever so pls have a patience with me


> With best regards,
> Radovan


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