Date:	Fri, 8 Dec 1995 22:18:20
From:	"Alaric B. Williams" <DJGPP AT abwillms DOT demon DOT co DOT uk>
Reply-To:	DJGPP AT abwillms DOT demon DOT co DOT uk
To:	DJGPP AT sun DOT soe DOT clarkson DOT edu
Subject:	Re: Overlaying
Lines:	27

In your message dated Friday 8, December 1995 you wrote :
> In my emacs that I am writing in Gnu C++, there is a fair length of program
> text which is obeyed once on starting and not again. I can't call it as a
> child process, as if I did the child would need to know many subroutine entry
> addresses in the parent and to write to arrays in the parent. To save space,
> is there any way I can get a particular subroutine X() to be put right at the
> top end of the fully assembled program, so that after running it I can (how?)
> move the start-of-free-store pointer back down to release the space occupied
> by the code of X()? Is there a way to find the start and finish of the memory
> occupied by subroutine X()?, so I can cannibalize it for work space.

I've seen a DLL library for DJGPP somewhere. That might allow you to put the 
initialiser into an external library, link it in, use it, then free it up again.
Just I dunno where.

What would be nice is a relocator that can malloc a buffer and plonk a COFF 
binary in, with some mechanism for it to provide entry points etc.
This could be made quite portable, IMHO.


Regards,

ABW
-- 
Alaric B. Williams (alaric AT abwillms DOT demon DOT co DOT uk)
"A man walks into a bar, right, and he goes 'ouch' coz it's an iron bar"

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