mirror of
https://github.com/asterinas/asterinas.git
synced 2025-06-18 20:16:42 +00:00
88 lines
2.2 KiB
Rust
88 lines
2.2 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
|
||
|
||
//！This crate defines the component system related macros.
|
||
//!
|
||
|
||
#![feature(proc_macro_diagnostic)]
|
||
#![allow(dead_code)]
|
||
#![deny(unsafe_code)]
|
||
|
||
mod init_comp;
|
||
mod priority;
|
||
|
||
use init_comp::ComponentInitFunction;
|
||
use proc_macro::TokenStream;
|
||
use quote::quote;
|
||
use syn::parse_macro_input;
|
||
|
||
pub(crate) const COMPONENT_FILE_NAME: &str = "Components.toml";
|
||
|
||
/// Register a function to be called when the component system is initialized. The function should not public.
|
||
///
|
||
/// Example:
|
||
/// ```rust
|
||
/// #[init_component]
|
||
/// fn init() -> Result<(), component::ComponentInitError> {
|
||
/// Ok(())
|
||
/// }
|
||
///
|
||
/// ```
|
||
///
|
||
/// It will expand to
|
||
/// ```rust
|
||
/// fn init() -> Result<(), component::ComponentInitError> {
|
||
/// Ok(())
|
||
/// }
|
||
///
|
||
/// const fn file() -> &'static str{
|
||
/// file!()
|
||
/// }
|
||
///
|
||
/// component::submit!(component::ComponentRegistry::new(&init,file()));
|
||
/// ```
|
||
/// The priority will calculate automatically
|
||
///
|
||
#[proc_macro_attribute]
|
||
pub fn init_component(_: TokenStream, input: TokenStream) -> proc_macro::TokenStream {
|
||
let function = parse_macro_input!(input as ComponentInitFunction);
|
||
let function_name = &function.function_name;
|
||
quote! {
|
||
#function
|
||
|
||
const fn file() -> &'static str{
|
||
file!()
|
||
}
|
||
|
||
component::submit!(component::ComponentRegistry::new(&#function_name,file()));
|
||
}
|
||
.into()
|
||
}
|
||
|
||
/// Automatically generate all component information required by the component system.
|
||
///
|
||
/// It mainly uses the output of the command `cargo metadata` to automatically generate information about all components, and also checks whether `Components.toml` contains all the components.
|
||
///
|
||
/// It is often used with `component::init_all`.
|
||
///
|
||
/// Example:
|
||
///
|
||
/// ```rust
|
||
/// component::init_all(component::parse_metadata!());
|
||
/// ```
|
||
///
|
||
#[proc_macro]
|
||
pub fn parse_metadata(_: TokenStream) -> proc_macro::TokenStream {
|
||
let out = priority::component_generate();
|
||
let path = priority::get_component_toml_path();
|
||
quote! {
|
||
{
|
||
include_str!(#path);
|
||
extern crate alloc;
|
||
alloc::vec![
|
||
#(component::ComponentInfo::new #out),*
|
||
]
|
||
}
|
||
}
|
||
.into()
|
||
}
|