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Mon, 23 Feb 2026 16:23:14 -0700 From: Tom Tromey To: Simon Marchi Cc: Tom Tromey , gdb-patches@sourceware.org Subject: Re: [RFC 0/4] Better Python safety In-Reply-To: (Simon Marchi's message of "Mon, 23 Feb 2026 16:00:35 -0500") References: <20260222200759.1587070-1-tom@tromey.com> X-Attribution: Tom Date: Mon, 23 Feb 2026 16:23:12 -0700 Message-ID: <87y0kjqc2n.fsf@tromey.com> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box5379.bluehost.com X-AntiAbuse: Original Domain - sourceware.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tromey.com X-BWhitelist: no X-Source-IP: 97.122.122.234 X-Source-L: No X-Exim-ID: 1vufGk-00000003VSW-0W5j X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 97-122-122-234.hlrn.qwest.net (prentzel) [97.122.122.234]:33136 X-Source-Auth: tom+tromey.com X-Email-Count: 2 X-Org: HG=bhshared;ORG=bluehost; X-Source-Cap: ZWx5bnJvYmk7ZWx5bnJvYmk7Ym94NTM3OS5ibHVlaG9zdC5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfKZOUHg0B+GN4o+dc8y6QgNplJHyQsZHvMQp4lq7H9e5mOzZ0STVPP/ZLhjH4LxpElNDJkfPosx7g2yNQgEXymJtLMNNaAucwxLhxQUNeyT6fSZZIkEI RDfo8gKG0W2z2DEmdaQqYPAAdxH7U0B8h5GruisSrLl4NI/T+H/S2RxHEaiZtoq0x2zsO9sREdcifL8T1J3bVFUGhEZeyxDJjf4= X-BeenThere: gdb-patches@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gdb-patches-bounces~public-inbox=simark.ca@sourceware.org >>>>> "Simon" == Simon Marchi writes: Simon> We have BorrowedObject: Simon> https://git.efficios.com/?p=babeltrace.git;a=blob;f=src/cpp-common/bt2/borrowed-object.hpp;h=3ea62072df3f0dbfbf2ad3434980c4f7f597dd39;hb=HEAD Simon> which holds a weak reference on an object. It can't hold nullptr, Simon> meaning that if you receive a BorrowedObject of some kind, you know Simon> there is an object in it. Initially I made gdbpy_borrowed_ref reject NULL pointers, but Python will pass NULL as the keyword argument to varargs methods. But I think a separate class can be done. Simon> Finally (1), is there something specific to GDB here? I'm wondering if we Simon> could make it a separate project (and import it in GDB), because it's Simon> something I would be tempted to use outside of GDB. Yeah, it is tied into other parts of gdb to some extent. It checks for gdb exceptions specifically and gdbpy_convert_exception knows about QUIT and whatnot. gdbpy_ref is just an specialization of a template in gdbsupport. The result converters use LONGEST, ULONGEST, and gdb::unique_xmalloc_ptr (dunno if all those are in the patches I already sent, but anyway they are clearly needed). The string converter uses host_charset(). I vaguely plan to eventually use gdb_python_exception to solve the "exception denaturation" problem, which would mean integrating it more with the existing gdb exception system. Simon> https://nanobind.readthedocs.io/en/latest/exchanging.html#option-3-wrappers Simon> I'm not convinced that going with this library would be easier in the Simon> long run, but I think we should at least take a moment to check what is Simon> out there before writing something new. To me this looks more complicated than anything we need. I did look at it predecessor, pybind11, a little before starting. Tom