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/*
* Copyright (c) 2006-2025, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author notes
* 2025-10-29 foxglove Component export macro module
*/
use darling::FromMeta;
use proc_macro::TokenStream;
use proc_macro2::Span;
use syn::{parse_macro_input, spanned::Spanned, ReturnType, Visibility, Meta};
use syn::parse::Parser;
use syn::NestedMeta as DarlingNestedMeta;
#[derive(Debug, FromMeta)]
struct ComponentArgs {
#[darling(default)]
name: Option<String>,
}
/** RT-Thread component export macro
Used to export a function as an RT-Thread component initialization entry
Usage:
```rust
#[rt_component_export]
fn my_component_init() {
// Component initialization logic
}
```
Or specify a name:
```rust
#[rt_component_export(name = "my_component")]
fn my_component_init() {
// Component initialization logic
}
```
*/
pub fn rt_component_export(args: TokenStream, input: TokenStream) -> TokenStream {
let f = parse_macro_input!(input as syn::ItemFn);
let parser = syn::punctuated::Punctuated::<Meta, syn::token::Comma>::parse_terminated;
let raw_meta = match parser.parse(args) {
Ok(v) => v,
Err(e) => return e.to_compile_error().into(),
};
let raw_arg: Vec<DarlingNestedMeta> = raw_meta
.into_iter()
.map(DarlingNestedMeta::Meta)
.collect();
let parg = ComponentArgs::from_list(&raw_arg).map_err(|e| e.write_errors());
let arg = match parg {
Ok(x) => x,
Err(e) => {
return e.into();
}
};
if arg.name.is_none() {
return syn::parse::Error::new(
Span::call_site(),
"`#[rt_component_export]` macro must have attribute `name`",
)
.to_compile_error()
.into();
}
let component_seg_name = format_ident!("__{}_component_seg", arg.name.as_ref().unwrap());
let component_func_name = format_ident!("__{}_component_func", arg.name.as_ref().unwrap());
let component_struct_name = format_ident!("__{}_component_seg_struct", arg.name.as_ref().unwrap());
let mod_name = format_ident!("__component_func_{}_", arg.name.as_ref().unwrap());
let call_func_name = f.sig.ident.clone();
/* Check function signature */
let valid_signature = f.sig.constness.is_none()
&& f.sig.unsafety.is_none()
&& f.sig.asyncness.is_none()
&& f.vis == Visibility::Inherited
&& f.sig.abi.is_none()
&& f.sig.inputs.is_empty()
&& f.sig.generics.params.is_empty()
&& f.sig.generics.where_clause.is_none()
&& f.sig.variadic.is_none()
&& match f.sig.output {
ReturnType::Default => true,
_ => false,
};
if !valid_signature {
return syn::parse::Error::new(
f.span(),
"`#[rt_component_export]` function must have signature `fn()`",
)
.to_compile_error()
.into();
}
let attrs = f.attrs.clone();
let origin = quote!(
#(#attrs)*
#f
);
let component_seg = quote!(
struct #component_struct_name (*const ());
unsafe impl Sync for #component_struct_name{}
#[no_mangle]
pub unsafe extern "C" fn #component_func_name() -> i32 {
#call_func_name();
0
}
#[link_section = ".rti_fn.4"]
#[no_mangle]
static #component_seg_name: #component_struct_name
= #component_struct_name (#component_func_name as *const ());
);
quote!(
#origin
mod #mod_name {
use super::#call_func_name;
use core::marker::Sync;
#component_seg
}
)
.into()
}
|
