Re: Help getting started debugging Emacs on macOS Sierra

[Itai Berli <itai.berli@gmail.com>]

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If I make a change to the code, for experimentation purposes, how do I
compile it so I can see my change in action and debug it? Should I run

./autogen.sh
./autogen.sh git
CFLAGS='-O0 -g3' ./configure
make
make install

or can I simply compile the file that I changed with the compiler (GCC or
Clang)?

On Fri, Aug 11, 2017 at 8:32 PM, Itai Berli <itai.berli@gmail.com> wrote:

> Thank you, Eli.
>
> On Fri, Aug 11, 2017 at 7:08 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>
>> > From: Itai Berli <itai.berli@gmail.com>
>> > Date: Fri, 11 Aug 2017 18:34:08 +0300
>> > Cc: Emacs developers <emacs-devel@gnu.org>
>> >
>> > > 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:
>> > https://www.w3.org/International/articles/inline-bidi-markup/uba-basics
>>
>> 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
>>   (gdb) continue
>>
>> 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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