Re: MPS: face-cache

[Gerd Möllmann]

Gerd Möllmann <gerd.moellmann@gmail.com> writes:

> Helmut Eller <eller.helmut@gmail.com> writes:
>
>> On Sun, Apr 28 2024, Gerd Möllmann wrote:
>>
>>> Wow! I'm an idiot. All three thumbs up! Did you already try it?
>>
>> Yes. My test case is this
>>
>> set args -Q -eval '(progn (view-hello-file) (while t (redisplay) 
>> (igc--collect) (forward-line)))'
>>
>> It goes now a few lines further before it hits the next issue.
>
> Hm, yeah. I've oused that, BTW.

Ok, it's an assertion in font_has_char for me.

(lldb) p font
(Lisp_Object) 0x000000010320c8b5 (struct Lisp_Vector *) $7 = 0x000000010320c8b0
(lldb) p *(struct igc_header *) ((char *) $7 - 8)
(struct igc_header)  (obj_type = IGC_OBJ_FWD, pvec_type = PVEC_FONT, hash = 
174276, nwords = 16)

The header says the object gas been moved (IGC_OBJ_FWD), which should
mean that the reference from where font comes hasn't been traced
(otherwise it wouldn't point to the tombstone.