On 1/2/26 1:47 PM, Pierrick Bouvier wrote:
Writing plugins in C can be sometimes tedious, especially when using Glib to
keep track of execution state. We can directly use the same C API but write our
plugin in C++, benefiting from its great standard library offering strings,
smart pointers, data structures and synchronization mechanisms.
It's common for downstream QEMU forks to provide C++ for plugins, like this:
- https://github.com/panda-re/panda/tree/dev/panda/plugins
- https://github.com/FlorentRevest/DejaView/tree/main/src/qemu_plugin
Hopefully this will help more people to use upstream QEMU, and as a benefit, get
their contribution back and help to develop plugins ecosystem upstream directly.
This series first cleans up build system for plugins, factorizing details
between contrib/plugins and tests/tcg/plugins folders.
Then, we perform codebase cleanups to fix conflicts between existing headers
and C++ headers.
After that, we can update the C++ standard used by QEMU, to benefit fully
from latest updates of the language.
Finally, we define an empty C++ plugin, making sure we can keep track of
possible regression in qemu-plugin header.
Note: This series is *not* a trojan horse to bring C++ in QEMU
codebase, nor to define an alternative C++ API for plugins. It's just enabling
more users to get the most out of existing C plugin API.
CI: https://gitlab.com/pbo-linaro/qemu/-/pipelines/2242427013
v2
--
- drop coroutine.h rename patch as it's not needed
- drop ctype.h rename patch, and move qemu-plugin.h to include/plugins
- fix mem.c to not depend on other QEMU headers
Pierrick Bouvier (11):
plugins: move win32_linker.c file to plugins directory
plugins: factorize plugin dependencies and library details
plugins: use complete filename for defining plugins sources
plugins: define plugin API symbols as extern "C" when compiling in C++
tests/tcg/plugins/mem.c: remove dependency on qemu headers
plugins: move qemu-plugin.h to include/plugins/
meson: fix supported compiler arguments in other languages than C
meson: enable cpp (optionally) for plugins
qga/vss-win32: fix clang warning with C++20
meson: update C++ standard to C++23
contrib/plugins: add empty cpp plugin
docs/devel/tcg-plugins.rst | 4 +-
meson.build | 26 +++--
include/{qemu => plugins}/qemu-plugin.h | 11 +-
include/qemu/plugin.h | 2 +-
plugins/core.c | 2 +-
{contrib/plugins => plugins}/win32_linker.c | 0
tests/tcg/plugins/mem.c | 59 ++++------
contrib/plugins/cpp.cpp | 119 ++++++++++++++++++++
contrib/plugins/meson.build | 25 ++--
plugins/meson.build | 17 ++-
qga/vss-win32/requester.cpp | 6 +-
scripts/clean-includes | 2 +-
tests/tcg/plugins/meson.build | 18 +--
13 files changed, 204 insertions(+), 87 deletions(-)
rename include/{qemu => plugins}/qemu-plugin.h (99%)
rename {contrib/plugins => plugins}/win32_linker.c (100%)
create mode 100644 contrib/plugins/cpp.cpp
v3 sent:
https://lore.kernel.org/qemu-devel/[email protected]/T/#t
Regards,
Pierrick
