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Re: Heap corruption?
From: |
Stefan Monnier |
Subject: |
Re: Heap corruption? |
Date: |
Thu, 21 Aug 2003 12:42:10 -0400 |
> > And what do you suggest we can do about it?
>
> One could either move the tag bits to the bottom of Lisp objects, or
> reduce the number of bits being used at the top, which Stefan might be
> working on, and which XEmacs has done, I think.
>
> (IIRC, I started on the latter in the branch ``gerd_int'', but I
> don't recall how far that got.)
FWIW, the current CVS code does not use the MARKBIT any more.
I haven't committed the change to XGCTYPE and other macros to take
advantage of that yet, but it will give a factor of 2 increase in
max-buffer-size and max-addressable-memory.
It is also trivial to extend the range of integers by another factor
of 2 by splitting the Lisp_Int into Lisp_Int0 and Lisp_Int1 (we're
only using 7 of the 8 available tags right now).
As for moving the remaining 3 tag bits to the lower bits, I haven't done that
yet. Most objects currently are guaranteed to be on an 8byte boundary,
but not all. The main exception is the Lisp_Misc objects (most importantly
the markers and overlays) which currently take up 5 words and can't be
reduced to 4 so we'll have to bump them up to 6 words.
Stefan
- Re: Heap corruption?, (continued)
- Re: Heap corruption?, Gerd Moellmann, 2003/08/19
- Re: Heap corruption?, Gerd Moellmann, 2003/08/22
- Message not available
- Re: Heap corruption?, Kim F. Storm, 2003/08/22
- Re: Heap corruption?, Gerd Moellmann, 2003/08/21
- Re: Heap corruption?, Kim F. Storm, 2003/08/21
- Re: Heap corruption?, Gerd Moellmann, 2003/08/22
- Re: Heap corruption?, Richard Stallman, 2003/08/22
- Re: Heap corruption?, Gerd Moellmann, 2003/08/22
- Re: Heap corruption?, Miles Bader, 2003/08/21
- Message not available
- Re: Heap corruption?, Miles Bader, 2003/08/21
- Re: Heap corruption?,
Stefan Monnier <=
- Re: Heap corruption?, Gerd Moellmann, 2003/08/22
- Re: Heap corruption?, Miles Bader, 2003/08/22
- Re: Heap corruption?, Richard Stallman, 2003/08/23
- Re: Heap corruption?, Miles Bader, 2003/08/23
- Re: Heap corruption?, Richard Stallman, 2003/08/23
- Message not available
- Re: Heap corruption?, Richard Stallman, 2003/08/22
- Re: Heap corruption?, Gerd Moellmann, 2003/08/21