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From: Ted Dennison <dennison@telepath.com>
Subject: Re: heap exhausted during elaboration
Date: 2000/07/31
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In article <398494D9.ADE9F40F@mail.utexas.edu>,
  "Bobby D. Bryant" <bdbryant@mail.utexas.edu> wrote:
> npriebe wrote:
>
> > I use a gnat compiler under windows NT and during the elaboration
> > time ,I get a error message : storage error : heap exhausted.
> > I use many generic packages like :
> > with package ... is new ...
> > may this is a common problem of  a exhausted heap
> >
> > What can I do? How can I increase the heap or
> > do something else?
>
> Hopefully someone more expert will comment, but AFAIK the only ways to
> increase your available heap are to increase the size of your physical
> memory, increase the size of your page/swap file, or get other things
> out of memory.  (You may also be able to reduce the size of the stack
> for the program, though this might cause its own problems.)

Typically this is a result of doing something very wasteful with memory.
The most common one I can think of is declaring a variant record with a
variant array field based on some index with a huge range like Positive.
Eg:

type Dumb_Variant (End : Positive := 5) is record
   Elements : String (1..Index);
end record;

Variant_Array_That_Uses_Up_Whole_Memory_Space : Dumb_Variant;

On most compilers, this will require your 5-element array to reserve
Positive'last bytes of storage for possible future growth.

--
T.E.D.

http://www.telepath.com/~dennison/Ted/TED.html


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