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bug#48731: 26.3; GDB doesn't draw breakpoints with <MULTIPLE> addresses/
From: |
Niall Ryan |
Subject: |
bug#48731: 26.3; GDB doesn't draw breakpoints with <MULTIPLE> addresses/locations |
Date: |
Sat, 29 May 2021 17:54:07 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0 Thunderbird/78.7.1 |
------
Bug Description:
Issue:
'gdb' with gdb-many-windows, fails to draw breakpoints in the bar
on the left of each window if the gdb breakpoint has
<MULTIPLE>
addresses/multiple locations.
<MULTIPLE> addresses can occur if a shared
library breakpoint is set.
The issue appears to manifest in the function
gdb-place-breakpoints()
- For each breakpoint, the function uses
(bindat-get-field breakpoint 'line)
to determine the linenumber of the breakpoint
- However, this fails for breakpoints as the line
field (if
present), is at a lower level of the list tree, in one of
the items in
the sublist "locations"
Example:
Note: I am creating these
breakpoints as follows. On gdb
startup, the shared library symbols are loaded and set with:
- add-symbol-file -readnow handmade.so
- b handmade.cpp:224
The breakpoint will initially be drawn in the relevant
buffer
The value of gdb-breakpoint-list is at first:
((#1="1"
(number . #1#)
(type . "breakpoint")
(disp . "keep")
(enabled . "y")
(addr . "0x000000000000c168")
(func . "GameUpdateAndRender(game_memory*, game_input*,
game_render_commands*)")
(file . "../cpp/code/handmade.cpp")
(fullname .
"/home/niall/software/handmadehero/sdl/cpp/code/handmade.cpp")
(line . "224")
(thread-groups "i1")
(times . "0")
(original-location . "handmade.cpp:224")))
(bindat-get-field breakpoint 'line) initially succeeds and
the
breakpoint is drawn.
However, on running the
program, once the shared library is actually
loaded, the value of
gdb-breakpoint-list becomes
((#1="1"
(number . #1#)
(type . "breakpoint")
(disp . "keep")
(enabled . "y")
(addr . "")
(times . "1")
(original-location . "handmade.cpp:224")
(locations
((number . "1.1")
(enabled . "y")
(addr . "")
(pending . "handmade.cpp:224")
(thread-groups "i1"))
((number . "1.2")
(enabled . "y")
(addr . "0x00007ffff7f4e168")
(func . "GameUpdateAndRender(game_memory*, game_input*,
game_render_commands*)")
(file . "../cpp/code/handmade.cpp")
(fullname .
"/home/niall/software/handmadehero/sdl/cpp/code/handmade.cpp")
(line . "224")
(thread-groups "i1")))))
And (bindat-get-field breakpoint 'line) fails,
and the breakpoint is no longer drawn (it is initially
wiped in gdb-place-breakpoints)
I hope this helps someone.
Niall
P.S.
I am not well expierienced with lisp, so apologies for
any terminology errors.
-----------------------------End Bug description-------
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Version 3.24.14)
of 2020-03-26, modified by Debian built on
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