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#![recursion_limit = "128"]
extern crate proc_macro;
use proc_macro::TokenStream;
use proc_macro2::{TokenStream as TokenStream2, TokenTree};
use quote::{quote, ToTokens, TokenStreamExt};
use syn::{
parse::{Parse, ParseStream},
parse_macro_input,
spanned::Spanned,
DeriveInput, Error, Generics, Ident, ItemFn, ItemType, LitStr, Visibility,
};
struct TypeDefinition {
ident: Ident,
generics: Generics,
}
impl Parse for TypeDefinition {
fn parse(input: ParseStream) -> syn::Result<Self> {
if let Ok(d) = DeriveInput::parse(input) {
Ok(Self {
ident: d.ident,
generics: d.generics,
})
} else if let Ok(t) = ItemType::parse(input) {
Ok(Self {
ident: t.ident,
generics: t.generics,
})
} else {
Err(input.error("Input is not an alias, enum, struct or union definition"))
}
}
}
macro_rules! err {
($span:expr, $message:expr $(,)?) => {
Error::new($span.span(), $message).to_compile_error()
};
($span:expr, $message:expr, $($args:expr),*) => {
Error::new($span.span(), format!($message, $($args),*)).to_compile_error()
};
}
#[proc_macro_attribute]
pub fn unsafe_guid(args: TokenStream, input: TokenStream) -> TokenStream {
let (time_low, time_mid, time_high_and_version, clock_seq_and_variant, node) =
match parse_guid(parse_macro_input!(args as LitStr)) {
Ok(data) => data,
Err(tokens) => return tokens.into(),
};
let mut result: TokenStream2 = input.clone().into();
let type_definition = parse_macro_input!(input as TypeDefinition);
let ident = &type_definition.ident;
let (impl_generics, ty_generics, where_clause) = type_definition.generics.split_for_impl();
result.append_all(quote! {
unsafe impl #impl_generics ::uefi::Identify for #ident #ty_generics #where_clause {
#[doc(hidden)]
#[allow(clippy::unreadable_literal)]
const GUID: ::uefi::Guid = ::uefi::Guid::from_values(
#time_low,
#time_mid,
#time_high_and_version,
#clock_seq_and_variant,
#node,
);
}
});
result.into()
}
fn parse_guid(guid_lit: LitStr) -> Result<(u32, u16, u16, u16, u64), TokenStream2> {
let guid_str = guid_lit.value();
if guid_str.len() != 36 {
return Err(err!(
guid_lit,
"\"{}\" is not a canonical GUID string (expected 36 bytes, found {})",
guid_str,
guid_str.len()
));
}
let mut offset = 1;
let mut guid_hex_iter = guid_str.split('-');
let mut next_guid_int = |len: usize| -> Result<u64, TokenStream2> {
let guid_hex_component = guid_hex_iter.next().unwrap();
let lit = match guid_lit.to_token_stream().into_iter().next().unwrap() {
TokenTree::Literal(lit) => lit,
_ => unreachable!(),
};
let span = lit
.subspan(offset..offset + guid_hex_component.len())
.unwrap_or_else(|| lit.span());
if guid_hex_component.len() != len * 2 {
return Err(err!(
span,
"GUID component \"{}\" is not a {}-bit hexadecimal string",
guid_hex_component,
len * 8
));
}
offset += guid_hex_component.len() + 1;
u64::from_str_radix(guid_hex_component, 16).map_err(|_| {
err!(
span,
"GUID component \"{}\" is not a hexadecimal number",
guid_hex_component
)
})
};
Ok((
next_guid_int(4)? as u32,
next_guid_int(2)? as u16,
next_guid_int(2)? as u16,
next_guid_int(2)? as u16,
next_guid_int(6)?,
))
}
#[proc_macro_derive(Protocol)]
pub fn derive_protocol(item: TokenStream) -> TokenStream {
let item = parse_macro_input!(item as DeriveInput);
let ident = item.ident.clone();
let (impl_generics, ty_generics, where_clause) = item.generics.split_for_impl();
let result = quote! {
impl #impl_generics ::uefi::proto::Protocol for #ident #ty_generics #where_clause {}
impl #impl_generics !Send for #ident #ty_generics #where_clause {}
impl #impl_generics !Sync for #ident #ty_generics #where_clause {}
};
result.into()
}
#[proc_macro_attribute]
pub fn entry(args: TokenStream, input: TokenStream) -> TokenStream {
let mut errors = TokenStream2::new();
if !args.is_empty() {
errors.append_all(err!(
TokenStream2::from(args),
"Entry attribute accepts no arguments"
));
}
let mut f = parse_macro_input!(input as ItemFn);
if let Some(ref abi) = f.sig.abi {
errors.append_all(err!(abi, "Entry method must have no ABI modifier"));
}
if let Some(asyncness) = f.sig.asyncness {
errors.append_all(err!(asyncness, "Entry method should not be async"));
}
if let Some(constness) = f.sig.constness {
errors.append_all(err!(constness, "Entry method should not be const"));
}
if !f.sig.generics.params.is_empty() {
errors.append_all(err!(
f.sig.generics.params,
"Entry method should not be generic"
));
}
if !errors.is_empty() {
return errors.into();
}
let unsafety = f.sig.unsafety.take();
f.vis = Visibility::Inherited;
let ident = &f.sig.ident;
let result = quote! {
#[export_name = "efi_main"]
#unsafety extern "efiapi" #f
const _: #unsafety extern "efiapi" fn(::uefi::Handle, ::uefi::table::SystemTable<::uefi::table::Boot>) -> ::uefi::Status = #ident;
};
result.into()
}