[Openmcl-devel] how to debug this? (1 > (:B) => Don't know how to find slots of 0

R. Matthew Emerson rme at clozure.com
Sun Oct 9 16:16:52 PDT 2016

> On Oct 7, 2016, at 11:25 AM, Pascal J. Bourguignon <pjb at informatimago.com> wrote:
> Ralf Stoye <stoye at stoye.com> writes:
>> Hi,
>> at first: sorry if this post is a duplicate, the first mail doesn't
>> seem to reach the list.
>> Using cl-markdown, i encounter a bug which even prevents a
>> backtrace. sometimes i'm thrown into the kernel debugger. In any case
>> the data is substantially damaged and i am not comfortable debugging
>> cl-containers and other involved libraries.
>> Since the code runs seamless in sbcl it may be some ccl problem (i
>> understand that often some vague interpretation of the specs causes
>> things like that ;-)
>>> Error: Array index -20 out of bounds for #<SIMPLE-VECTOR 13> .
> Most probably, you'll discover it's not a ccl problem.
> Start by grepping all the sources you load for "optimize", and remove
> all declaration, declaimation and proclaimation of optimize.
> Then (declaim (optimize (space 0) (speed 0) (debug 3) (safety 3)))
> and remove the compiled binaries, and recompile and reload the sources.
> ccl will most probably tell you right away where the problem is.

Another approach you might try is to set ccl:*load-preserves-optimization-settings* to t, then remove fasls and recompile.

This setting makes (declaim (optimize ...)) effectively file local.  When the setting is nil (as it is by default), (declaim (optimize ...)) has load-time effects.

You can use (declaration-information 'optimize) to see what the current optimize settings are.

The default, of course, is ((SPEED 1) (SAFETY 1) (COMPILATION-SPEED 1) (SPACE 1) (DEBUG 1)).

If you've loaded some file that contains (declaim (optimize (safety 0))) or something equally ill-advised, (declaration-information 'optimize) will show different values.

To belabor the point, you could do something like this:

(declaration-information 'optimize)
(ql:quickload :some-system)
(declaration-information 'optimize)

If output of declaration-information changes after loading the system, some file is messing around with global optimization settings and should be fixed.


(eval-when (:compile-toplevel)
  (declaim (optimize ...))

is what is actually meant.

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