Re: Crash during access_keymap

[YAMAMOTO Mitsuharu]

>>>>> On Sun, 13 Nov 2005 23:54:29 -0500, "Richard M. Stallman" 
>>>>> <address@hidden> said:

>> So, if there's a non-pure object that is only pointed to by pure
>> objects, which may happen if the assumption for the pure storage is
>> violated, then the object is reachable but get collected.

> Is there evidence that this is in fact happening?

David (and others) are distributing precompiled GNU Emacs binaries
with additional files preloaded.  And they see a problem (so-called
"commandp" one) which I don't see with the CVS version.  I suspect
this is due to the situation above, but there's no evidence yet.

> If so, can you see a general rule for how to prevent it from
> happening?

I think compile-time analysis would not become perfect because of
dynamic bindings.

On some systems including Mac OS X, the pure storage is not remapped
to the text segment.  But still one can set watchpoint to the array
`pure' to do run-time check.  I think it is sufficient if additional
preloading is for developers/power-users rather than for ordinary
users.

                                     YAMAMOTO Mitsuharu
                                address@hidden