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Re: C# and Parrot

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Leopold Toetsch
October 17, 2002 23:57
Re: C# and Parrot
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Rhys Weatherley wrote:

> The Portable.NET C# compiler, cscc, is very extensive, and is
> capable of generating output for multiple bytecode formats (IL
> and JVM are currently supported, more or less).

Have a look at imcc, which is our high level assembler. imcc does 
register allocation and (currently little) optimization. perl6 produces 
IMCC code. imcc can also run the code or write PBC files.

> I'm a bit confused as to how one creates a user-defined class
> in Parrot, and makes virtual method calls, accesses fields,
> and what-not.  

Not yet.

> Is there a convention for which registers must be saved
> across a call and which can be clobbered?  


> ... Is the JIT smart enough to optimize
> away unnecessary copies?

AFAIK no, optimzation should be done one level up, so all run cores 
would benefit.

> What is the size of the "int" type?  Will it always be 32 bit
> or is it "whatever is best for the machine"?  

It's a Configure option.

> And how do
> I perform a "sign extend" operation?

We currently have only one INTVAL, it should promote to BIGINT.

> Is there some means to store and access auxillary data in
> a Parrot bytecode file?  I might need this to store metadata
> for supporting C# reflection.

There was some discussion WRT extending the bytecode format not too long 
ago: s. Subject "RFC: static line number information".

> Cheers,
> Rhys.


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