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- To: RLB at MIT-MC
- Subject: more info
- From: Robert W. Kerns <RWK at MIT-MC>
- Date: Mon, 21 Jan 80 12:14:00 GMT
- Cc: BUG-DDT at MIT-MC, BUG-LISP at MIT-MC
- Original-date: 21 January 1980 07:14-EST
Date: 19 JAN 1980 0255-EST
From: RLB at MIT-MC (Richard L. Bryan)
To: (BUG DDT)
Re: more info
Start a Lisp without symbols in DDT.
(SETQ SYMBOLS T)
Load HUMBLE from LISP;.
See DDT BUG DO :BUG DDT ...
The Lisp is doing
.BREAK 12,[..SSTB,,T] with T/ -302,,mumble
Thereafter, at strange times, having to do with job manipulation, the bug
msg reappears. I encountered occurrences of jobs doing .BREAK 12, at startup.
If such jobs are reselected, the BUG DDT ... happens again.
:PDUMP MC:CRASH;RLB .BREAK
The :SELF is unecessary. Undesirable even.
I think LISP is passing up a malformed symbol table, fucking DDT over
royally. As near as I can tell from the totally inadaquate
documentation on this feature, LISP should be passing a symbol table,
as documented in DDT ORDER. It's not easy for DDT to protect itself
from this kind of lossage.
As I understand it, this is what you should be doing. It seems to work
ok for me.
1) Turn on %SYGBL in the symbols. Either that or %SYLCL *MUST* be
set, as documented in DDT ORDER.
2) By the way, I assume it's LISP that's clearing out the %SYHKL bit
in the symbols being passed up. Please make it stop doing that, It
makes the SYMBOLS T feature completely useless since it hides important
symbols like A.
3) Put all the symbols in a symbol block. I'd suggest, for maximum
utility, putting them into a block named after the FN1 of the FASL
SYMS: .SQUOZE 0,TEST ;Test BLOCK
-10,,1 ;10 long, including 2 for header, level 1
GO: .BREAK 12,[..SSTB,,[-10,,SYMS]]