[okl4-developer] question on "string" and "smallstring" support

[Kalamkar, Dhiraj D]

Hi JC,

I had faced similar problem in past and to fix those I modified few template files in tools/magpie directory.
Apply attached patch from okl4 base directory using
	patch -p0 < smallstring.patch

I am not sure patch attached will work for prototype 
	smallstring retreive_string(void);
but it will work for prototype
	void retreive_string(out smallstring str);

See if it helps.

Thanks,
Dhiraj



-----Original Message-----
From: developer-bounces at okl4.org [mailto:developer-bounces at okl4.org] On Behalf Of Jean-Christophe DUBOIS
Sent: Tuesday, July 22, 2008 12:09 PM
To: Geoffrey Lee
Cc: developer at okl4.org
Subject: Re: [okl4-developer] question on "string" and "smallstring" support

Le Tuesday 22 July 2008 05:33:00 Geoffrey Lee, vous avez écrit :
> On Thu, Jul 17, 2008 at 11:53:53AM +0200, Jean-Christophe DUBOIS wrote:
> > Hum ... I am not sure that even the smallstring would work with the
> > latest OKL4 release.
> >
> > The smallstring type is understood by magpie ans the code seems to be
> > correctly generated but the smallstring type seems to be just missing
> > from OKL4 header files. Therefore no compilation is possible.
> >
> > Was smallstring "removed" on purpose or is this a mistake?
>
> When Magpie generates the C header files it turns it into a char
> pointer.  Hence, there is no "smallstring" type in the OKL4 header
> files, for example.

Well there must be a bug then because this is only partially true. For example 
here is the IDL4 file:
===============================================
import "iguana/types.h";

[uuid(45)]
interface hello_
{
  void store_string(in smallstring text);
  smallstring retreive_string(void);
};
===============================================

And here is an extract of the generated server header file 
(./build/iguana/object/libs_hello/include/interfaces/hello_serverdecls.h):
===============================================
....
/* Prototype for the function which implements this service. Implement this. 
*/
smallstring hello__retreive_string_impl(L4_ThreadId_t caller, 
idl4_server_environment *env);

/* Reply-only function, for callbacks. */
static inline void hello__retreive_string_reply(CORBA_Object _client , 
smallstring __return );static inline void
hello__retreive_string_reply(CORBA_Object _client , smallstring __return )
{
        byte *mr = (void *)L4_MRStart();
        /* Marshal */
        mr_varptr = &mr[4];
        mr_varptr = magpie_marshal_smallstring(__return, mr_varptr);
        /* Return number of return MRs used */
        /* Number of registers used depends on length of variable-length 
portion */
        *((L4_Word_t *)(void *)(&mr[0])) = ((L4_Word_t)(mr_varptr - mr) / 
sizeof(L4_Word_t));

        /* send message */
        L4_MsgLoad((L4_Msg_t *)mr);
        L4_Reply(_client);
}
...
===================================================

And obviously there is no "definition" for "smallstring" to be found anywhere.

Also could you give a status on the "struct" or "string" support in IDL4 
files?

Thanks

JC

> Have a look at the generated header files.  If you are building
> for the Iguana environment they will likely be in build/iguana/object.
>
> 	-gl


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