[PATCH RFC 0/5] rust: implement tracing

[Manos Pitsidianakis <manos.pitsidianakis@linaro.org>]

This RFC series contains some simple patches I've been sitting on for
some months to allow tracing in rust devices in a similar matter to C,
only it's done via a proc-macro codegen instead of using tracetool
script or equivalent.

It also adds the same tracepoints as C in the pl011 device (cc: Philippe)

TODOS:
- Do not allocate string when calling ::qemu_api::log::LogGuard::log_fmt
  (See commit message)
- Properly handle&report errors in proc-macro
- Clean up proc-macro code
- Add test for proc-macro
- Add dev documentation

Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
---
Manos Pitsidianakis (5):
      rust/bindings: add trace headers
      rust/qemu-api/log: add Log::Trace variant
      rust/qemu-api-macros: Add #[trace_events] macro
      rust/pl011: impl Copy, Clone for RegisterOffset
      rust/pl011: add trace events

 rust/hw/char/pl011/src/device.rs    |  28 +++++++-
 rust/hw/char/pl011/src/lib.rs       |  43 +++++++++++
 rust/hw/char/pl011/src/registers.rs |   2 +-
 rust/qemu-api-macros/src/lib.rs     | 140 +++++++++++++++++++++++++++++++++++-
 rust/qemu-api/src/bindings.rs       |   3 +
 rust/qemu-api/src/log.rs            |   4 ++
 rust/qemu-api/wrapper.h             |   2 +
 7 files changed, 215 insertions(+), 7 deletions(-)
---
base-commit: e5859141b9b6aec9e0a14dacedc9f02fe2f15844
change-id: 20250804-rust_trace-8558fc98ec88

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