bug#6952: jit-lock with default, small chunk-size causing incorrect fontification in cc-mode

bug#6952: jit-lock with default, small chunk-size causing incorrect fontification in cc-mode

[Daniel Colascione]

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I've attached a file that demonstrates incorrect fontification with
cc-mode and jit-lock used together -- the last function in the file is
not fontified as a function when a file is first visited with
jit-lock-chunk-size equal to its default 512. If I change that to
32768 or change some of the whitespace in the fiile, fontification is
correct again. I've attached the file because the testcase is
whitespace-sensitive.

Presumably, the underlying cause is jit-lock asking cc-mode to start
or stop fontification in an unexpected place.

[-- Attachment #2: foo.c --]
[-- Type: application/octet-stream, Size: 510 bytes --]

                                
                        
                    
                   
                        
                   

type
abcabcabcabcabcabcabc (
              typetypetypety paramparampa,
              typet* paramparamparam);

type
dsflkajfklafjdaslkfjasfdd (
              typetypetypety paramparampa,
              typet* paramparamparam);

type
vcxkzvjxcdflasfdsafdt (
         typetypetypetypetypet param,
         typet paramparamp,
         typet* paramparamparampa
    );

bug#6952: jit-lock with default, small chunk-size causing incorrect fontification in cc-mode

[Stefan Monnier]

> Presumably, the underlying cause is jit-lock asking cc-mode to start
> or stop fontification in an unexpected place.

I doubt the error is in jit-lock, because the assumptions made by
jit-lock.el are almost identical to the ones made by the non-jit-lock
code.  Jit-lock relies more heavily on some of those assumptions, tho,
so it's probably more difficult to reproduce without jit-lock, but
reproducing it without jit-lock might be the best way to debug
the problem.


        Stefan

bug#6952: jit-lock with default, small chunk-size causing incorrect fontification in cc-mode

[Noam Postavsky]

tags 6952 + unreproducible
quit

Daniel Colascione <dan.colascione@gmail.com> writes:

> I've attached a file that demonstrates incorrect fontification with
> cc-mode and jit-lock used together -- the last function in the file is
> not fontified as a function when a file is first visited with
> jit-lock-chunk-size equal to its default 512.

I can't reproduce this, neither by setting jit-lock-chunk-size to 512,
nor with the default of 500.  The fontification of that file looks fine.
Tested from 24.3 to current master (27.0.50).

bug#6952: jit-lock with default, small chunk-size causing incorrect fontification in cc-mode

[Stefan Kangas]

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Noam Postavsky <npostavs@gmail.com> writes:

> tags 6952 + unreproducible
> quit
>
> Daniel Colascione <dan.colascione@gmail.com> writes:
>
>> I've attached a file that demonstrates incorrect fontification with
>> cc-mode and jit-lock used together -- the last function in the file is
>> not fontified as a function when a file is first visited with
>> jit-lock-chunk-size equal to its default 512.
>
> I can't reproduce this, neither by setting jit-lock-chunk-size to 512,
> nor with the default of 500.  The fontification of that file looks fine.
> Tested from 24.3 to current master (27.0.50).

I can't reproduce this either, so I'm closing this bug report.  If anyone
is still seeing this on a modern Emacs, please re-open.

Best regards,
Stefan Kangas

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