• Ilya Minkov <webmaster midiclub.de.vu> Aug 31 2003
• "Walter" <walter digitalmars.com> Aug 31 2003
• Ilya Minkov <webmaster midiclub.de.vu> Sep 02 2003
• "Walter" <walter digitalmars.com> Sep 03 2003

Hello.

I intend to (try to) write a plug-in for Jeskola BUZZ sound machines 
system, and i wanted to know whether there's any way to avoid using 
Microsoft compilers.

The Plug-in interface consists out of few functions, which get packaged 
into a DLL, and simply deliver some objects to the host application. So, 
it would requiere, that:

  - an (C++) object from a DLL must have exactly the same format, VTable 
structure, calling conventions as MSVC code;
  - the key functions are __fastcall, so a corresponding calling 
convention must exist.

I found the CTG not really clear on these subjects.
Thanks beforehand.

-eye

The DMC++ compiler is compatible for object layout and vtables. It is
compatible with the C++ calling convention, stdcall, and pascal conventions.
It does not support the fastcall convention, though you could deal with that
by writing a small shim.

"Ilya Minkov" <webmaster midiclub.de.vu> wrote in message
news:bitu98$2978$1 digitaldaemon.com...
 Hello.

 I intend to (try to) write a plug-in for Jeskola BUZZ sound machines
 system, and i wanted to know whether there's any way to avoid using
 Microsoft compilers.

 The Plug-in interface consists out of few functions, which get packaged
 into a DLL, and simply deliver some objects to the host application. So,
 it would requiere, that:

   - an (C++) object from a DLL must have exactly the same format, VTable
 structure, calling conventions as MSVC code;
   - the key functions are __fastcall, so a corresponding calling
 convention must exist.

 I found the CTG not really clear on these subjects.
 Thanks beforehand.

 -eye

Walter wrote:
 The DMC++ compiler is compatible for object layout and vtables. It is
 compatible with the C++ calling convention[...]


Thanks.

 It does not support the fastcall convention, though you could deal with that
 by writing a small shim.


How? Dig up the calling conventions info and go assembly?
Do you have any pointers handy?

Thanks.

-eye

"Ilya Minkov" <webmaster midiclub.de.vu> wrote in message
news:bj38oi$m1b$1 digitaldaemon.com...
 Walter wrote:
 The DMC++ compiler is compatible for object layout and vtables. It is
 compatible with the C++ calling convention[...]


 Thanks.

 It does not support the fastcall convention, though you could deal with




 by writing a small shim.


 How? Dig up the calling conventions info and go assembly?
 Do you have any pointers handy?


A shim would look like this:

int __fastcall theirfoo(int a, int b);

extern "C"
{
    int __cdecl myfoo(int a, int b)
    {
        return theirfoo(a, b);
    }
}

It's probably easiest to compile it in MSVC++, since they support the
fastcall convention. Otherwise, it'll have to be done with a bit of inline
assembler to do the call to theirfoo(). One way to do that is to compile it
in MSVC++, disassemble it, and plug the assembler into DMC++'s inline
assembler.