Re: New GNAT ports (was Re: Ada and Automotive Industry)

[dewar@merv.cs.nyu.edu (Robert Dewar)]

Richard said

"The only reason that I bothered about the placement of code at all
was that the 8051 book I was studying included a memory test program
that did this.  According to the Ada 83 LRM I had handy, you _couldn't_
supply address clauses for code."

That is wrong, Ada 83 did allow you to specify the address of a subprogram,
and in fact using this in conjunction with pragma Interface was a well
known way of fooling a compiler into providing a mechanism equiavlent to
an indirect call:


   procedure x;
   for x'address use expression; -- expression need not be static
   pragma interface (Ada, x);

now when you call x, you call the subprogram at the given address.
In fact CIFO specifically required this to work!