mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-23 18:30:23 -04:00
00fccd3ecc
This derive macro implements `Zeroable` for structs & unions precisely
if all fields also implement `Zeroable` and does nothing otherwise. The
plain `Zeroable` derive macro instead errors when it cannot derive
`Zeroable` safely. The `MaybeZeroable` derive macro is useful in cases
where manual checking is infeasible such as with the bindings crate.
Move the zeroable generics parsing into a standalone function in order
to avoid code duplication between the two derive macros.
Link: 1165cdad1a
Signed-off-by: Benno Lossin <benno.lossin@proton.me>
55 lines
1.7 KiB
Rust
55 lines
1.7 KiB
Rust
// SPDX-License-Identifier: Apache-2.0 OR MIT
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// When fixdep scans this, it will find this string `CONFIG_RUSTC_VERSION_TEXT`
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// and thus add a dependency on `include/config/RUSTC_VERSION_TEXT`, which is
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// touched by Kconfig when the version string from the compiler changes.
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//! `pin-init` proc macros.
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#![cfg_attr(not(RUSTC_LINT_REASONS_IS_STABLE), feature(lint_reasons))]
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// Allow `.into()` to convert
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// - `proc_macro2::TokenStream` into `proc_macro::TokenStream` in the user-space version.
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// - `proc_macro::TokenStream` into `proc_macro::TokenStream` in the kernel version.
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// Clippy warns on this conversion, but it's required by the user-space version.
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//
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// Remove once we have `proc_macro2` in the kernel.
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#![allow(clippy::useless_conversion)]
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// Documentation is done in the pin-init crate instead.
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#![allow(missing_docs)]
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use proc_macro::TokenStream;
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#[cfg(kernel)]
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#[path = "../../../macros/quote.rs"]
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#[macro_use]
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#[cfg_attr(not(kernel), rustfmt::skip)]
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mod quote;
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#[cfg(not(kernel))]
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#[macro_use]
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extern crate quote;
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mod helpers;
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mod pin_data;
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mod pinned_drop;
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mod zeroable;
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#[proc_macro_attribute]
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pub fn pin_data(inner: TokenStream, item: TokenStream) -> TokenStream {
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pin_data::pin_data(inner.into(), item.into()).into()
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}
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#[proc_macro_attribute]
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pub fn pinned_drop(args: TokenStream, input: TokenStream) -> TokenStream {
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pinned_drop::pinned_drop(args.into(), input.into()).into()
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}
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#[proc_macro_derive(Zeroable)]
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pub fn derive_zeroable(input: TokenStream) -> TokenStream {
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zeroable::derive(input.into()).into()
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}
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#[proc_macro_derive(MaybeZeroable)]
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pub fn maybe_derive_zeroable(input: TokenStream) -> TokenStream {
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zeroable::maybe_derive(input.into()).into()
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}
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