Re: [Gm2] Calling C functions

[Gaius Mulley]

john o goyo <address@hidden> writes:

> The info page (Para. 2.14) states:
>
> For example unbounded arrays are
> passed as a `struct {void *address, unsigned int high}' and the
> contents of these arrays are copied by callee functions when they are
> declared as non `VAR' parameters.
>
> Here is an example which can be found in the source tree
> `gcc-VERSION-GCC/gcc/gm2/examples/callingC/libprintf.def'
>
>      DEFINITION MODULE FOR "C" libprintf ;
>
>      EXPORT UNQUALIFIED printf ;
>
>      PROCEDURE printf (a: ARRAY OF CHAR; ...) : [ INTEGER ] ;
>
>      END libprintf.
>
>
> These cannot both be correct as printf() knows nothing about the
> structure
> in the first paragraph.  What happens to the HIGH value.
>
> jog

Hi John,

true, the definition for C treats the ARRAY OF type parameters differently.

http://www.nongnu.org/gm2/interface_to_c.html

in the case of ARRAY OF CHAR as char * (no high is passed),

regards,
Gaius