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eb2a1063c1
Right now, we have this concept of sections where one packet can be
broken up into multiple sub-packets. Currently, we handle ths by every
packet's `_packed` struct is just an array of `uint32_t` and we do
pointer math and cast to get at the subset of the `uint32_t` array
belonging to the given section. This works okay if we're operating on
`void *` but it blows up on strict aliasing rules if we're ever trying
to pack sections into a `struct foo_packed` on the stack.
To work around this, make it so that anything with sections emits
something like this:
struct foo_packed {
union {
uint32_t packed[N];
struct {
struct foo_sec1_packed sec1;
struct foo_sec2_packed sec2;
};
};
};
This is entirely safe because C allows unions and structs to overlap as
long as the members that have the same base type end up on top of each
other. Since everything is a `uint32_t` internally, this is safe
according to the C pointer rules. And now that everything is a
substruct, everything is nicely named and we can easily get to sections
without pointer magic.
Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Acked-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Eric R. Smith <eric.smith@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39759>
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| VERSION | ||
`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.rst <https://docs.mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <https://docs.mesa3d.org/meson.html>`_): .. code-block:: sh $ meson setup build $ ninja -C build/ $ sudo ninja -C build/ install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `OFTC's #dri-devel <irc://irc.oftc.net/dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.rst <https://docs.mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://docs.mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.