[PING][PATCH v5 0/1] gdb: Add python support for demangling register unwind values

[Craig Blackmore <craig.blackmore@embecosm.com>]

Ping.

Thanks,

Craig

On 08/06/2026 13:04, Craig Blackmore wrote:
> This version addresses review comments from Andrew Burgess and Eli
> Zaretskii from:
>
>    https://sourceware.org/pipermail/gdb-patches/2026-May/227549.html
>    https://sourceware.org/pipermail/gdb-patches/2026-May/227536.html
>
> Changes since v4:
>
> * Change `demangle` method to `read`.
>
> * Refer to transforming instead of demangling in the code and
>    documentation.
>
> * Fix long line in python.texi.
>
> * Rebase.
>
> Changes since v3:
>
> * Change lval_type to lvalue type in NEWS and python documentation.
>
> * Remove line about future support for multiple transformers or
>    different loci from python documentation.
>
> Changes since v2:
>
> * Removed RFC from subject.
>
> * Changed `gdb.unwinder.UnwindRegisterValueDemangler` to
>    `gdb.unwinder.UnwindRegisterValueTransformer` so that other transform
>    methods could be supported in future rather than being restricted to
>    demangling only.  Demangling is now done by calling the `demangle`
>    method instead of `__call__`.
>
> * Made transformer registration similar to unwinder registration to
>    allow future support for registering multiple transformers and
>    registering to other loci.
>
> * Call `invalidate_cached_frames` after registering a transformer.
>
> * Made `gdb.unwinder.UnwindRegisterValueTransformer.name` read-only
>    and added type check.
>
> * Pass `gdb.Frame` to demanglers instead of `frame_type`.
>
> * Added global `python_transformer_enabled` to `py-unwind.c` which
>    python sets when any transformer is registered.  This allows us to
>    skip entering the python environment when demangling and no
>    transformers are registered.
>
> * Replaced `gdb.Value.is_lval_register` and `gdb.Value.is_lval_memory`
>    read-only boolean attributes with `gdb.Value.lval_type` read-only
>    type attribute.
>
> * Removed redundant `return` after call to `error`.
>
> * Replaced `NULL` with `nullptr`.
>
> * Added tests for invalid registration and invalid return value from
>    demangler.
>
> * Updated tests and documentation to match the above changes.
>
> * Rebased.
>
> Craig Blackmore (1):
>    gdb: Add python support for transforming register unwind values
>
>   gdb/NEWS                                      |  17 ++
>   gdb/doc/python.texi                           |  96 ++++++++++
>   gdb/extension-priv.h                          |   8 +
>   gdb/extension.c                               |  35 ++++
>   gdb/extension.h                               |   6 +
>   gdb/frame.c                                   |  10 ++
>   gdb/guile/guile.c                             |   2 +
>   gdb/python/lib/gdb/__init__.py                |  21 +++
>   gdb/python/lib/gdb/unwinder.py                |  93 +++++++++-
>   gdb/python/py-registers.c                     |   2 +-
>   gdb/python/py-unwind.c                        | 169 ++++++++++++++++++
>   gdb/python/py-value.c                         |  21 +++
>   gdb/python/python-internal.h                  |   3 +
>   gdb/python/python.c                           |   4 +-
>   .../gdb.python/py-unwind-transformer-error.py |  33 ++++
>   .../gdb.python/py-unwind-transformer.c        |  80 +++++++++
>   .../gdb.python/py-unwind-transformer.exp      | 115 ++++++++++++
>   .../gdb.python/py-unwind-transformer.py       |  48 +++++
>   gdb/testsuite/gdb.python/py-value.exp         |   8 +
>   19 files changed, 768 insertions(+), 3 deletions(-)
>   create mode 100644 gdb/testsuite/gdb.python/py-unwind-transformer-error.py
>   create mode 100644 gdb/testsuite/gdb.python/py-unwind-transformer.c
>   create mode 100644 gdb/testsuite/gdb.python/py-unwind-transformer.exp
>   create mode 100644 gdb/testsuite/gdb.python/py-unwind-transformer.py
>