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// SPDX-License-Identifier: GPL-2.0
//! Crate for all kernel procedural macros.
mod concat_idents;
mod helpers;
mod module;
mod vtable;
use proc_macro::TokenStream;
/// Declares a kernel module.
///
/// The `type` argument should be a type which implements the [`Module`]
/// trait. Also accepts various forms of kernel metadata.
///
/// C header: [`include/linux/moduleparam.h`](../../../include/linux/moduleparam.h)
///
/// [`Module`]: ../kernel/trait.Module.html
///
/// # Examples
///
/// ```ignore
/// use kernel::prelude::*;
///
/// module!{
/// type: MyModule,
/// name: "my_kernel_module",
/// author: "Rust for Linux Contributors",
/// description: "My very own kernel module!",
/// license: "GPL",
/// params: {
/// my_i32: i32 {
/// default: 42,
/// permissions: 0o000,
/// description: "Example of i32",
/// },
/// writeable_i32: i32 {
/// default: 42,
/// permissions: 0o644,
/// description: "Example of i32",
/// },
/// },
/// }
///
/// struct MyModule;
///
/// impl kernel::Module for MyModule {
/// fn init() -> Result<Self> {
/// // If the parameter is writeable, then the kparam lock must be
/// // taken to read the parameter:
/// {
/// let lock = THIS_MODULE.kernel_param_lock();
/// pr_info!("i32 param is: {}\n", writeable_i32.read(&lock));
/// }
/// // If the parameter is read only, it can be read without locking
/// // the kernel parameters:
/// pr_info!("i32 param is: {}\n", my_i32.read());
/// Ok(Self)
/// }
/// }
/// ```
///
/// # Supported argument types
/// - `type`: type which implements the [`Module`] trait (required).
/// - `name`: byte array of the name of the kernel module (required).
/// - `author`: byte array of the author of the kernel module.
/// - `description`: byte array of the description of the kernel module.
/// - `license`: byte array of the license of the kernel module (required).
/// - `alias`: byte array of alias name of the kernel module.
/// - `alias_rtnl_link`: byte array of the `rtnl_link_alias` of the kernel module
/// (mutually exclusive with `alias`).
/// - `params`: parameters for the kernel module, as described below.
///
/// # Supported parameter types
///
/// - `bool`: Corresponds to C `bool` param type.
/// - `i8`: No equivalent C param type.
/// - `u8`: Corresponds to C `char` param type.
/// - `i16`: Corresponds to C `short` param type.
/// - `u16`: Corresponds to C `ushort` param type.
/// - `i32`: Corresponds to C `int` param type.
/// - `u32`: Corresponds to C `uint` param type.
/// - `i64`: No equivalent C param type.
/// - `u64`: Corresponds to C `ullong` param type.
/// - `isize`: No equivalent C param type.
/// - `usize`: No equivalent C param type.
/// - `str`: Corresponds to C `charp` param type. Reading returns a byte slice.
/// - `ArrayParam<T,N>`: Corresponds to C parameters created using `module_param_array`.
/// An array of `T`'s of length at **most** `N`.
///
/// `invbool` is unsupported: it was only ever used in a few modules.
/// Consider using a `bool` and inverting the logic instead.
#[proc_macro]
pub fn module(ts: TokenStream) -> TokenStream {
module::module(ts)
}
/// Declares or implements a vtable trait.
///
/// Linux's use of pure vtables is very close to Rust traits, but they differ
/// in how unimplemented functions are represented. In Rust, traits can provide
/// default implementation for all non-required methods (and the default
/// implementation could just return `Error::EINVAL`); Linux typically use C
/// `NULL` pointers to represent these functions.
///
/// This attribute is intended to close the gap. Traits can be declared and
/// implemented with the `#[vtable]` attribute, and a `HAS_*` associated constant
/// will be generated for each method in the trait, indicating if the implementor
/// has overridden a method.
///
/// This attribute is not needed if all methods are required.
///
/// # Examples
///
/// ```ignore
/// use kernel::prelude::*;
///
/// // Declares a `#[vtable]` trait
/// #[vtable]
/// pub trait Operations: Send + Sync + Sized {
/// fn foo(&self) -> Result<()> {
/// Err(EINVAL)
/// }
///
/// fn bar(&self) -> Result<()> {
/// Err(EINVAL)
/// }
/// }
///
/// struct Foo;
///
/// // Implements the `#[vtable]` trait
/// #[vtable]
/// impl Operations for Foo {
/// fn foo(&self) -> Result<()> {
/// # Err(EINVAL)
/// // ...
/// }
/// }
///
/// assert_eq!(<Foo as Operations>::HAS_FOO, true);
/// assert_eq!(<Foo as Operations>::HAS_BAR, false);
/// ```
#[proc_macro_attribute]
pub fn vtable(attr: TokenStream, ts: TokenStream) -> TokenStream {
vtable::vtable(attr, ts)
}
/// Concatenate two identifiers.
///
/// This is useful in macros that need to declare or reference items with names
/// starting with a fixed prefix and ending in a user specified name. The resulting
/// identifier has the span of the second argument.
///
/// # Examples
///
/// ```ignore
/// use kernel::macro::concat_idents;
///
/// macro_rules! pub_no_prefix {
/// ($prefix:ident, $($newname:ident),+) => {
/// $(pub(crate) const $newname: u32 = kernel::macros::concat_idents!($prefix, $newname);)+
/// };
/// }
///
/// pub_no_prefix!(
/// binder_driver_return_protocol_,
/// BR_OK,
/// BR_ERROR,
/// BR_TRANSACTION,
/// BR_REPLY,
/// BR_DEAD_REPLY,
/// BR_TRANSACTION_COMPLETE,
/// BR_INCREFS,
/// BR_ACQUIRE,
/// BR_RELEASE,
/// BR_DECREFS,
/// BR_NOOP,
/// BR_SPAWN_LOOPER,
/// BR_DEAD_BINDER,
/// BR_CLEAR_DEATH_NOTIFICATION_DONE,
/// BR_FAILED_REPLY
/// );
///
/// assert_eq!(BR_OK, binder_driver_return_protocol_BR_OK);
/// ```
#[proc_macro]
pub fn concat_idents(ts: TokenStream) -> TokenStream {
concat_idents::concat_idents(ts)
}
|
