I wrote a patch to improve gdbinit (gdb macros):

• implement py_decref
• reuse pyo in pylocals
• direclty call PyCode_Addr2Line() in lineno instead of a long and
  complex reimplemention in gdb script language
• avoid memory leak in pylocals: call py_decref($_name)

See also bpo-3610 (for Python 3.0).

Thanks for the patch. Most of it looks okay except for the rewrite of
the lineno command. That was written in gdb's command language so
that you could get a python stack from a core dump, not just from a
running process. Is there some reason it can't remain as it was
(changes to line number data structures between versions, perhaps)?

@Skip: oh yes, you're right about the core file :-) So forget the
changes in lineno. I first rewrote lineno for Python 3.0 because the
code changed and it was easier for me to reuse PyCode_Addr2Line() :-)

Gdb7 now supports Python as a script language, and Python trunk/py3k has a gdb library to debug Python programs. It's much better than the old Misc/gdbinit script.

Close this issue as "out of date".

It's too bad this is closed out of date because
a) the macro is still there being distributed
b) it simply hangs!
c) there's no easy way to figure out that you should be using something else instead.

I spent a few hours of my life figuring out why it fails and writing an alternative implementation that works for me.

Instead of just closing this ticket, something should be done about the distributions of python so that they don't suggest something that you consider outdated and doesn't actually work.

Here's my working version, for reference:

# THOMAS: the test for between Py_Main and Py_GetArgcArgv is because
# code is in that order in the C file; see Modules/main.c and its comment
# print the entire Python call stack
# same for eval in Python/ceval.c

# in 2.6, PyEval_EvalFrame is only bw compatible, and code now calls
# PyEval_EvalFrameEx
define pystack
set $__lastpc = $pc
set $__same = -1

while 1 == 1
\# select the highest frame with the same $pc
\# this will automatically terminate if we reach the top
    while $pc == $__lastpc
        up-silently
    end
    down-silently

    if $pc \> PyEval_EvalFrameEx && $pc \< PyEval_EvalCodeEx
    pyframe
    else
        \# frame
    end
    up-silently 1
    set $__lastpc = $pc

end
select-frame 0

end

fyi - for information on using gdb 7 with python see http://bugs.python.org/issue8032

I'm looking at the .gdbinit improvements regardless as not everyone has gdb 7 (notably OS X).

everything except the lineno change from gdbinit_python26.patch has been committed in r85646.

and the py_decref in there isn't quite right, fixing...

I think the reference to EasierPythonDebugging is outdated and should be corrected. Dave Malcolm's work is already part of Python, and available with every Python build.

do we have official python docs on this that I should point to?

do we have official python docs on this that I should point to?

I only know of the doc string of libpython.py itself, in Tools/gdb

I updated the note in gdbinit to point to Tools/gdb/libpython.py for py3k (3.2) and 2.7.

Thomas: I didn't do anything with your version of pystack because the existing versions in 3.2 and 2.7 appear to work fine for me.