ANNOUNCE - swig-1.3.38

*** ANNOUNCE: SWIG 1.3.38 (31 January 2009) ***

http://www.swig.org

We're pleased to announce SWIG-1.3.38, the latest installment in the
SWIG development effort.  SWIG-1.3.38 includes a number of bug fixes
and enhancements.

What is SWIG?
-------------

SWIG is a software development tool that reads C/C++ header files and
generates the wrapper code needed to make C and C++ code accessible
from other languages including Perl, Python, Tcl, Ruby, PHP, Java,
Scheme (Guile, MzScheme, CHICKEN), Ocaml, Lua, Pike, C#, Modula-3, 
Octave, R,
Common Lisp (CLISP, Allegro CL, CFFI, UFFI). SWIG can also export its parse
tree in the form of XML and Lisp s-expressions.  Major applications of
SWIG include generation of scripting language extension modules, rapid
prototyping, testing, and user interface development for large C/C++
systems.

What's New?
===========

SWIG-1.3.38 summary:
- Output directory regression fix and other minor bug fixes

Availability:
-------------

Python %nothread for everything %extend

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returning an unmanaged object

Hi!

I'm trying to make a C++ application extendible by Ruby-"plug-ins".

For this I need Ruby to return object pointers, which are not tracked by
the GC.

So in my Ruby code I have something like:

class Bar
    def create_new
        return Foo.new
    end
end

...where Foo is a wrapped C++ class.

Now I instantiate Bar from my C++ application and call create_new(). The
returned VALUE is converted to a Foo pointer with Data_Get_Struct().

So far, so good... this works fine. The question is: How do I detach the
new Foo object from the GC, so that I can later destroy it manually in the
C++ application?

%newobject doesn't help here, because the instance is not created by a
wrapped method.

thx,

Tobias

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Re: SWIG and CFFI

Christoph Egger schrieb:
> Hi!
> 
>   I'm trying to get SWIG running for my lisp environment (currently only
> testing if it works). I created some very basic .[chi] files and rand
> swig -cffi in the .i file. However loading the generated .lisp file
> (load "example.lisp") failed with an hint that there is no siuch thing
> as CFFI.
> 
>   I'm running this on Debian testing/unstable/experimental, SWIG is in
> Version 1.3.36 and CFFI is an snapshot from february 2008.
> 
>   Is there anything I do wrong? Anyone had swig+cffi running and could
> point me to some basic example?
> 
> Thanks
> 
>   Christoph
> 

Hi!

  Sorry for the noise but I could get this part working with
    (asdf:oos 'asdf:load-op :cffi)
however loading the swig file still warns me about the function being an
«Undefined alien» and I can not call the function from within lisp.

Regards

  Christoph

-- 
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http://www.christoph-egger.org/

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Re: SWIG and CFFI

On Monday 02 February 2009 00:35:45 Christoph Egger wrote:
> Christoph Egger schrieb:
> > Hi!
> >
> >   I'm trying to get SWIG running for my lisp environment (currently only
> > testing if it works). I created some very basic .[chi] files and rand
> > swig -cffi in the .i file. However loading the generated .lisp file
> > (load "example.lisp") failed with an hint that there is no siuch thing
> > as CFFI.
> >
> >   I'm running this on Debian testing/unstable/experimental, SWIG is in
> > Version 1.3.36 and CFFI is an snapshot from february 2008.
> >
> >   Is there anything I do wrong? Anyone had swig+cffi running and could
> > point me to some basic example?
> >
> > Thanks
> >
> >   Christoph
>
> Hi!
>
>   Sorry for the noise but I could get this part working with
>     (asdf:oos 'asdf:load-op :cffi)
> however loading the swig file still warns me about the function being an
> «Undefined alien» and I can not call the function from within lisp.
>
> Regards
>
>   Christoph

You need to manually add calls to cffi:load-foreign-library (preferably at the 
beginning of the file). E.g., add this to .i file:

%insert("lisphead") %{
(defpackage :bare-gtk (:use :cl))
  (in-package :bare-gtk)

(unless (cffi:use-foreign-library "libgtk-x11-2.0.so")
        (error "Library libgtk-x11-2.0.so not loaded"))
%}

If the wrapped library needs some initialization, you should add call to it 
after the functions are defined by swig:

%insert("swiglisp") %{
(gtk-init (cffi:foreign-alloc :int :initiial-element 0)
          (cffi:foreign-alloc :string :initial-contents '("/usr/bin/sbcl")))
#+sbcl(sb-ext::set-floating-point-modes :traps nil)
%}

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Re: returning an unmanaged object

Tobi wrote:

> For this I need Ruby to return object pointers, which are not tracked by
> the GC.
> 
> So in my Ruby code I have something like:
> 
> class Bar
>     def create_new
>         return Foo.new
>     end
> end

The only solution I found so far is:

VALUE obj;

// Load ruby code, instantiate Bar and get obj=bar.create_new()

Data_Get_Struct(obj, Foo, foo);
RDATA(obj)->dfree = 0;

// work with foo

delete(foo);

Is this the way it should be done?
I could do this in the *.i for all Foo objects as well, but I just need it
for the instances passed to the C++ application.

Tobias

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Re: returning an unmanaged object

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Re: Getting the Tutorial working

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Re: returning an unmanaged object

Alfredo José Muela Romero schrieb:

> Have you tried by using the swigCMemOwn member?

AFAIK this is only available for the Java and C# bindings.

Tobias

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Re: returning an unmanaged object

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