Re: A note on GNAT 3.05 performance

[progers@acm.org]

In <dewar.835605407@schonberg>, dewar@cs.nyu.edu (Robert Dewar) writes:
>"Michael F Brenner (mfb@mbunix.mitre.org) wrote:
>
>: Is this why djgpp DOS interrupts don't work any more...because
>: the structure containing the registers is a record type?
>"
>
>The best guess is that this relates to code that improperly assumes
>that records are passed by reference. In Ada (and in GNAT) whether
>a record is passed by reference or copy is implementatoin dependent
>and may change from one version of the compiler to another, or
>from one port to another (for example, in some ports, small records
>are passed by value in registers).
>
>If you want something passed by reference and your code depends on it,
>either use an access parameter (if the value is guaranteed to be non-null)
>or an explicit access type. This is the only legitimate way to be sure
>that a record is passed by reference.
>

Or make it limited.

pat
---------------
Patrick Rogers
progers@acm.org