Re: Placement of pragma Import

["David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>]

In my opinion, the best place to put it would be in the package
body.  After all, what you're declaring with the pragma Import
is the _implementation_ of the procedure Asm_Coded.

The fact that you're importing the implementation has nothing
whatever to do with the specification, so it should not
appear there.

David C. Hoos

----- Original Message ----- 
From: "Michal Nowak" <vinnie@inetia.pl>
To: "comp.lang.ada usegroup->mailing list gateway" <comp.lang.ada@ada.eu.org>
Sent: December 08, 2002 4:23 AM
Subject: Placement of pragma Import


> Hello all,
> 
> I have a little question coming out of curiosity.
> 
> I have an assembly routine (in fact it may be a C code,
> or something other, it does not matter).
> I'm importing this subroutine in a package. It is possible
> to place pragma Import in two (maybe more?) places:
> 
> -- Possibility 1:
> 
> package Import_Test is
>    
>    procedure Asm_Coded;
> 
>    pragma Import (Assembler, Asm_Coded, "donothing");   
>    pragma Linker_Options ("nothing_asm.s");      
>    
> end Import_Test;
> 
> -- Possibility 2:
> package Import_Test is
>    
>    procedure Asm_Coded;
> 
> private   -- Imported in private section
> 
>    pragma Import (Assembler, Asm_Coded, "donothing");
>    pragma Linker_Options ("nothing_asm.s");      
>    
> end Import_Test;
> 
> And a simple program which makes use of the above package:
> ---------------------------------
> with Import_Test;
> 
> procedure Test is
> begin
>    Import_Test.Asm_Coded;
> end Test;
> ---------------------------------
> 
> The generated assembly source for Import_Test and Test subprogram 
> is the same in both cases. The program behaves and links in the
> same way in both cases, but such test is not a proper way to say
> if something is correct (?) or not.
> I disassembled the main executable file with objdump and there are
> some differences. However, this analysis didn't gave me answer to
> what I want to know:
> - what is the difference between 1st and 2nd possibility (from Ada
>   point of view)?
> - if there is a difference, how does it affect program behavior,
>   visibility rules, etc.?
> - if there is no difference, why?
> 
> Thanks for any info,
>    - Michal
> 
> 
> -- -----------------------------------------------------------------
> --   ___        _
> --  / _ \      | |                      I Choose Ada:
> -- | |_| |  ___| |   _____   The Most Trusted Name in Software (TM)
> -- |  _  | | __  |  | __  | 
> -- |_| |_| |_____|_ |_____|_ http://www.adaic.org/whyada/choose.html
> --
> -- -----------------------------------------------------------------
> 
> _______________________________________________
> comp.lang.ada mailing list
> comp.lang.ada@ada.eu.org
> http://ada.eu.org/mailman/listinfo/comp.lang.ada
> 
>