Re: [PATCHES v2 0/7] Initial support for some Rust tags + way to ask for CU merging at load time

[Arnaldo Carvalho de Melo]

On Thu, Jun 18, 2026 at 12:15:59PM -0300, Arnaldo Carvalho de Melo wrote:
> Hi,
> 
>         Here is a series with some initial support for some Rust DWARF
> tags and a way to ask for CUs to be merged just like we do for LTO to
> cope with inter CU tag references.

Sorry Namhyung, used the wrong send mail script :-\ This one should have
been sent to the pahole mailing list, doing that now.

- Arnaldo
 
>         This makes one of the regression tests to pass again as perf now
> has some rust source files and thus Rust CUs in a perf binary built with
> DWARF, which is used to test pahole's pretty printing features, where it
> uses the DWARF in a perf binary to decode perf.data records.
> 
> 	Now this is implemented as --features=force_cu_merging,
> following a suggestion from Alan, so that we can ask for this, that
> albeit not optimal is a way to handle Rust and other cases that may need
> this CU merging approach while we don't have something that works in
> parallel as without this option.
> 
> - Arnaldo
> 
> Arnaldo Carvalho de Melo (7):
>   dwarf_loader: Initial support for DW_TAG_variant_part
>   dwarf_loader: Allow forcing the merge of CUs for solving inter CU tag
>     references
>   dwarf_loader: Initial support for DW_TAG_subprogram in
>     DW_TAG_enumeration
>   encoders: Fix diagnostic messages for unexpected tags in enumerations
>   dwarves_fprintf: Accumulate function__fprintf return value in
>     enumeration printing
>   dwarves: Use tag__delete for enumeration children
>   btf_encoder: Remove unused variables
> 
>  btf_encoder.c               | 17 ++++++----
>  ctf_encoder.c               | 16 ++++++---
>  dwarf_loader.c              | 67 +++++++++++++++++++++++++++++++------
>  dwarves.c                   | 35 +++++++++++++++----
>  dwarves.h                   | 19 ++++++++++-
>  dwarves_emit.c              | 10 +++---
>  dwarves_fprintf.c           | 44 +++++++++++++++++-------
>  man-pages/pahole.1          | 17 ++++++++--
>  pahole.c                    | 20 ++++++++---
>  tests/prettify_perf.data.sh |  4 +--
>  10 files changed, 195 insertions(+), 54 deletions(-)
> 
> -- 
> 2.54.0