Attempt to create an inline assembler for Guile

Attempt to create an inline assembler for Guile

[Sjoerd van Leent]

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Hi All,

In line with my will to create an assembler, I started first by being able
to execute something in memory, using the memory-mapper strategy. I am
aware not all platforms use the same mechanism, but this is a starting
point.

At a later point, an inline assembler can be used by a (more abstract) JIT
engine

I put my repository here:

https://github.com/santidhammo/guile-assembler

Met vriendelijke groet,
Sjoerd

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Re: Attempt to create an inline assembler for Guile

[Nala Ginrut]

nice work!
I may take look at it closely.
And I would recommend you use FFI if you just want to get pagesize, it's
easier than writing bunch of C code:
=============================code========================
(use-modules (system foreign))
(define ffi (dynamic-link))
(define sysconf
  (pointer->procedure int
                      (dynamic-func "sysconf" ffi)
                      (list int)))

(sysconf 30) ; 30 stands for _SC_PAGESIZE
==> 4096
==============================end=======================

Happy hacking!

On Wed, 2015-06-24 at 21:41 +0200, Sjoerd van Leent wrote:
> Hi All,
> 
> In line with my will to create an assembler, I started first by being able
> to execute something in memory, using the memory-mapper strategy. I am
> aware not all platforms use the same mechanism, but this is a starting
> point.
> 
> At a later point, an inline assembler can be used by a (more abstract) JIT
> engine
> 
> I put my repository here:
> 
> https://github.com/santidhammo/guile-assembler
> 
> Met vriendelijke groet,
> Sjoerd

Re: Attempt to create an inline assembler for Guile

[Sjoerd van Leent]

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Hi Nala

Ik actually use the underlying method in C at a number of other places. And
I am uncertain that other posixen might use other numbers. So I considered
exporting it directly.

In any case, the sysconf won't work on a handful of unfortunate operating
systems.

But you are right. The less in C, the better.
Op 25 jun. 2015 05:27 schreef "Nala Ginrut" <nalaginrut@gmail.com>:

> nice work!
> I may take look at it closely.
> And I would recommend you use FFI if you just want to get pagesize, it's
> easier than writing bunch of C code:
> =============================code========================
> (use-modules (system foreign))
> (define ffi (dynamic-link))
> (define sysconf
>   (pointer->procedure int
>                       (dynamic-func "sysconf" ffi)
>                       (list int)))
>
> (sysconf 30) ; 30 stands for _SC_PAGESIZE
> ==> 4096
> ==============================end=======================
>
> Happy hacking!
>
> On Wed, 2015-06-24 at 21:41 +0200, Sjoerd van Leent wrote:
> > Hi All,
> >
> > In line with my will to create an assembler, I started first by being
> able
> > to execute something in memory, using the memory-mapper strategy. I am
> > aware not all platforms use the same mechanism, but this is a starting
> > point.
> >
> > At a later point, an inline assembler can be used by a (more abstract)
> JIT
> > engine
> >
> > I put my repository here:
> >
> > https://github.com/santidhammo/guile-assembler
> >
> > Met vriendelijke groet,
> > Sjoerd
>
>
>

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Re: Attempt to create an inline assembler for Guile

[Ludovic Courtès]

Sjoerd van Leent <svanleent@gmail.com> skribis:

> I put my repository here:
>
> https://github.com/santidhammo/guile-assembler

Regarding executable pages, I think you can avoid C altogether by using
‘mmap’ from libc via the FFI:

  (define mmap
    (let* ((ptr  (dynamic-func "mmap" (dynamic-link)))
           (proc (pointer->procedure '* ptr (list ...))))
      (lambda (x y z)
        (pointer->bytevector (proc x y z) ...))))

Besides, that looks like a nice project!

Ludo’.