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From: Francois Godme <fgodme@magic.fr>
Subject: Re: Function Calls by Address
Date: 1999/09/08
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Newsgroups: comp.lang.ada
Date: 1999-09-08T00:00:00+00:00
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Pascal Obry wrote:

> Here we are
> talking
> about GNAT runtime routines for one specific paltform. The dispatching
> model will:
>
>    - always call the same code anyway
>    - makes GNAT slower
>    - makes GNAT executable (the compiler executable) bigger
>
> So I do not see why this could apply there...
>
> Pascal.

Suppose that you are writing the GNAT exception manager and that the frame
formats for the C language, the C++ language, the Ada95 language, etc. are
all different. Nevertheless, they are still frames and share some abstract
notions. As the GNAT runtime can be written in the full Ada95 language:),
you could write an abstract tagged type to represent frames. To unwind the
stack, you will call the abstract pop a frame method to force dispatching.

Now, if an application is made only of Ada code then the dispatching model
will:

    - always call the same code anyway,
    - ...
    - ...