|Subject:||Re: Help getting started debugging Emacs on macOS Sierra|
|Date:||Fri, 11 Aug 2017 20:32:56 +0300|
> From: Itai Berli <address@hidden>
> Date: Fri, 11 Aug 2017 18:34:08 +0300
> Cc: Emacs developers <address@hidden>
> > Tell me what you want to do and with what text, and then I might be able to help you do
> that in a more useful way.
> I just want to get more familiar with the bidi algorithm and the way it is implemented by Emacs. I'd like to try
> various small phrases, such as the ones that can be found in this article:
After entering GDB, set a breakpoint in a function called
Fredraw_display, then run Emacs ("run -Q"). Insert the text you want,
then move point to its beginning and type "C-x =". Remember the
buffer position displayed as result, let's call it POS.
Then type "M-x redraw-display RET". GDB will get control, and you can
now put breakpoints where you want. For tracing through the bidi.c
code, I'd suggest this:
(gdb) break bidi_get_next_char_visually if bidi_it->charpos == POS
When the breakpoint in bidi_get_next_char_visually breaks, you can
step through the code using the "step" and "next" commands (you have
tool-bar buttons for them).
Note that bidi_get_next_char_visually is called for each character the
display engine wants to display, so when it returns, it puts in
bidi_it->charpos the position of the next character in visual order.
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