diff options
Diffstat (limited to 'rust/macros/lib.rs')
| -rw-r--r-- | rust/macros/lib.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs index d61bc6a56425..a52443a3dbb9 100644 --- a/rust/macros/lib.rs +++ b/rust/macros/lib.rs @@ -9,6 +9,7 @@ #[macro_use] mod quote; mod concat_idents; +mod export; mod helpers; mod module; mod paste; @@ -174,6 +175,29 @@ pub fn vtable(attr: TokenStream, ts: TokenStream) -> TokenStream { vtable::vtable(attr, ts) } +/// Export a function so that C code can call it via a header file. +/// +/// Functions exported using this macro can be called from C code using the declaration in the +/// appropriate header file. It should only be used in cases where C calls the function through a +/// header file; cases where C calls into Rust via a function pointer in a vtable (such as +/// `file_operations`) should not use this macro. +/// +/// This macro has the following effect: +/// +/// * Disables name mangling for this function. +/// * Verifies at compile-time that the function signature matches the declaration in the header +/// file. +/// +/// You must declare the signature of the Rust function in a header file that is included by +/// `rust/bindings/bindings_helper.h`. +/// +/// This macro is *not* the same as the C macros `EXPORT_SYMBOL_*`. All Rust symbols are currently +/// automatically exported with `EXPORT_SYMBOL_GPL`. +#[proc_macro_attribute] +pub fn export(attr: TokenStream, ts: TokenStream) -> TokenStream { + export::export(attr, ts) +} + /// Concatenate two identifiers. /// /// This is useful in macros that need to declare or reference items with names |