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macro_rules! prefixed_extern {
// Functions.
{
$(
$( #[$meta:meta] )*
$vis:vis fn $name:ident ( $( $arg_pat:ident : $arg_ty:ty ),* $(,)? )
$( -> $ret_ty:ty )?;
)+
} => {
extern "C" {
$(
prefixed_item! {
link_name
$name
{
$( #[$meta] )*
$vis fn $name ( $( $arg_pat : $arg_ty ),* ) $( -> $ret_ty )?
}
}
)+
}
};
// A global variable.
{
$( #[$meta:meta] )*
$vis:vis static mut $name:ident: $typ:ty;
} => {
extern "C" {
prefixed_item! {
link_name
$name
{
$( #[$meta] )*
$vis static mut $name: $typ
}
}
}
};
}
#[cfg(any(target_arch = "arm", target_arch = "aarch64"))]
macro_rules! prefixed_export {
{
$( #[$meta:meta] )*
$vis:vis static mut $name:ident: $typ:ty = $initial_value:expr;
} => {
prefixed_item! {
export_name
$name
{
$( #[$meta] )*
$vis static mut $name: $typ = $initial_value
}
}
}
}
macro_rules! prefixed_item {
// Calculate the prefixed name in a separate layer of macro expansion
// because rustc won't currently accept a non-literal expression as
// the value for `#[link_name = value]`.
{
$attr:ident
$name:ident
{ $( $item:tt )+ }
} => {
prefixed_item! {
$attr
{ concat!("ring_core_dev_", stringify!($name)) }
{ $( $item )+ }
}
};
// Output the item.
{
$attr:ident
{ $prefixed_name:expr }
{ $( $item:tt )+ }
} => {
#[$attr = $prefixed_name]
$( $item )+;
};
}