From: Tom Tromey <tom@tromey.com>
To: gdb-patches@sourceware.org
Subject: [RFA 00/14] add a smart pointer for PyObject*
Date: Mon, 07 Nov 2016 06:00:00 -0000 [thread overview]
Message-ID: <1478497656-11832-1-git-send-email-tom@tromey.com> (raw)
This patch introduces a new smart pointer that manages a Python
reference, and then changes parts of the Python layer to use this new
wrapper.
Dealing with reference counting in the Python layer has been a
consistent source of bugs. It's relatively easy to introduce a memory
leak, especially when dealing with an error case. This new class
simplifies typical Python-facing code, reducing the chance of such
errors.
Many spots in gdb's Python layer deal with error-handling by "goto"
with a "fail" label; this series removes many such "goto"s. This
series provides other sorts of cleanups as well.
I avoided introducing changes when an ensure_python_env cleanup was in
use locally; throwing an exception across one of these when a
gdbpy_reference is in used could change the order of operations,
resulting in a Py_DECREF when the GIL is not held. I'm not sure
whether this happens in practice but it seemed best not to find out.
This is a net code reduction even including the new code and the
ChangeLog entries.
In the longer run I'd like to remove make_cleanup_py_decref and
ensure_python_env.
I've built on x86-64 Fedora 24 and run the gdb.python tests locally.
I'm also currently sending this through the buildbot.
Tom
next reply other threads:[~2016-11-07 6:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-07 6:00 Tom Tromey [this message]
2016-11-07 5:48 ` [RFA 04/14] Use gdbpy_reference in gdbpy_string_to_argv Tom Tromey
2016-11-07 5:48 ` [RFA 03/14] Use gdbpy_reference in py-type.c Tom Tromey
2016-11-07 5:48 ` [RFA 01/14] Introduce py-ref.h Tom Tromey
2016-11-07 7:45 ` Jan Kratochvil
2016-11-07 15:48 ` Tom Tromey
2016-11-10 23:48 ` Pedro Alves
2016-11-12 17:31 ` Tom Tromey
2016-11-15 14:32 ` Pedro Alves
2016-11-16 23:18 ` Tom Tromey
2016-11-16 23:34 ` Pedro Alves
2016-11-07 5:48 ` [RFA 11/14] Use gdbpy_reference in py-prettyprint.c Tom Tromey
2016-11-07 5:48 ` [RFA 05/14] Use gdbpy_reference in py-function.c Tom Tromey
2016-11-07 5:48 ` [RFA 14/14] Use gdbpy_reference in gdbpy_lookup_symbol Tom Tromey
2016-11-07 5:48 ` [RFA 08/14] Use gdbpy_reference in py-framefilter.c Tom Tromey
2016-11-07 5:48 ` [RFA 10/14] Use gdbpy_reference in call_doc_function Tom Tromey
2016-11-07 5:48 ` [RFA 07/14] Use gdbpy_reference in gdbpy_breakpoints Tom Tromey
2016-11-07 5:48 ` [RFA 12/14] Use gdbpy_reference in python.c Tom Tromey
2016-11-07 5:48 ` [RFA 06/14] Use gdbpy_reference in gdbpy_inferiors Tom Tromey
2016-11-07 5:48 ` [RFA 13/14] Use gdbpy_reference in py-value.c Tom Tromey
2016-11-07 5:56 ` [RFA 02/14] Change event code to use gdbpy_reference Tom Tromey
2016-11-11 0:09 ` Pedro Alves
2016-11-11 0:51 ` Pedro Alves
2016-11-07 5:57 ` [RFA 09/14] Use gdbpy_reference in py-linetable.c Tom Tromey
2016-11-08 4:07 ` [RFA 00/14] add a smart pointer for PyObject* Tom Tromey
2016-11-11 1:18 ` Pedro Alves
2016-11-11 3:34 ` Tom Tromey
2016-11-11 4:03 ` Pedro Alves
2016-11-11 5:49 ` Tom Tromey
2016-11-12 17:11 ` Tom Tromey
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