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// Copyright 2024, Linaro Limited
// Author(s): Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
// SPDX-License-Identifier: GPL-2.0-or-later
use proc_macro::TokenStream;
use proc_macro2::Span;
use quote::{quote, quote_spanned};
use syn::{
parse_macro_input, parse_quote, punctuated::Punctuated, token::Comma, Data, DeriveInput, Field,
Fields, Ident, Type, Visibility,
};
struct CompileError(String, Span);
impl From<CompileError> for proc_macro2::TokenStream {
fn from(err: CompileError) -> Self {
let CompileError(msg, span) = err;
quote_spanned! { span => compile_error!(#msg); }
}
}
fn is_c_repr(input: &DeriveInput, msg: &str) -> Result<(), CompileError> {
let expected = parse_quote! { #[repr(C)] };
if input.attrs.iter().any(|attr| attr == &expected) {
Ok(())
} else {
Err(CompileError(
format!("#[repr(C)] required for {}", msg),
input.ident.span(),
))
}
}
#[proc_macro_derive(Object)]
pub fn derive_object(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let name = input.ident;
let expanded = quote! {
::qemu_api::module_init! {
MODULE_INIT_QOM => unsafe {
::qemu_api::bindings::type_register_static(&<#name as ::qemu_api::qom::ObjectImpl>::TYPE_INFO);
}
}
};
TokenStream::from(expanded)
}
fn get_fields(input: &DeriveInput) -> Result<&Punctuated<Field, Comma>, CompileError> {
if let Data::Struct(s) = &input.data {
if let Fields::Named(fs) = &s.fields {
Ok(&fs.named)
} else {
Err(CompileError(
"Cannot generate offsets for unnamed fields.".to_string(),
input.ident.span(),
))
}
} else {
Err(CompileError(
"Cannot generate offsets for union or enum.".to_string(),
input.ident.span(),
))
}
}
#[rustfmt::skip::macros(quote)]
fn derive_offsets_or_error(input: DeriveInput) -> Result<proc_macro2::TokenStream, CompileError> {
is_c_repr(&input, "#[derive(offsets)]")?;
let name = &input.ident;
let fields = get_fields(&input)?;
let field_names: Vec<&Ident> = fields.iter().map(|f| f.ident.as_ref().unwrap()).collect();
let field_types: Vec<&Type> = fields.iter().map(|f| &f.ty).collect();
let field_vis: Vec<&Visibility> = fields.iter().map(|f| &f.vis).collect();
Ok(quote! {
::qemu_api::with_offsets! {
struct #name {
#(#field_vis #field_names: #field_types,)*
}
}
})
}
#[proc_macro_derive(offsets)]
pub fn derive_offsets(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let expanded = derive_offsets_or_error(input).unwrap_or_else(Into::into);
TokenStream::from(expanded)
}
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