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bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS
From: |
Eli Zaretskii |
Subject: |
bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS |
Date: |
Thu, 14 Jul 2022 19:55:41 +0300 |
> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Date: Thu, 14 Jul 2022 16:34:05 +0200
> Cc: 56553@debbugs.gnu.org
>
>
> On 2022-07-14,, at 16:18 , Gerd Möllmann <gerd.moellmann@gmail.com> wrote:
>
> frame #5: 0x000000010116d2b4 emacs`ns_define_fringe_bitmap(which=27,
> bits=0x00000001066e1860, h=12, w=16) at nsterm.m:2906:20
> 2903 /* XBM rows are always round numbers of bytes, with any unused
> 2904 bits ignored. */
> 2905 int byte = y * (w/8 + (w%8 ? 1 : 0)) + x/8;
> -> 2906 bool bit = bits[byte] & (0x80 >> x%8);
>
> I think the problem is indeed that bits is unsigned short*. Otherwise, the
> /8 and %8 in line 2903 don't make
> sense to me. I think "byte" computes an index in a byte (char) array.
>
> WDYT?
Do you understand what that loop is trying to do? What is this line
about:
if (bit)
[p appendBezierPathWithRect:NSMakeRect (x, y, 1, 1)];
Anyway, it sounds like you are saying that the code wants to access
the individual bytes of the 'short' elements?
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Eli Zaretskii, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS,
Eli Zaretskii <=
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/14
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Po Lu, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Eli Zaretskii, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Robert Pluim, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Eli Zaretskii, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Andreas Schwab, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15
- bug#56553: 29.0.50; ASAN error with fringe bitmaps on NS, Gerd Möllmann, 2022/07/15