Benno Lossin 9762dca54a rust: macros: add decl_generics to parse_generics() ... The generic parameters on a type definition can specify default values. Currently `parse_generics()` cannot handle this though. For example when parsing the following generics: <T: Clone, const N: usize = 0> The `impl_generics` will be set to `T: Clone, const N: usize = 0` and `ty_generics` will be set to `T, N`. Now using the `impl_generics` on an impl block: impl<$($impl_generics)*> Foo {} will result in invalid Rust code, because default values are only available on type definitions. Therefore add parsing support for generic parameter default values using a new kind of generics called `decl_generics` and change the old behavior of `impl_generics` to not contain the generic parameter default values. Now `Generics` has three fields: - `impl_generics`: the generics with bounds (e.g. `T: Clone, const N: usize`) - `decl_generics`: the generics with bounds and default values (e.g. `T: Clone, const N: usize = 0`) - `ty_generics`: contains the generics without bounds and without default values (e.g. `T, N`) `impl_generics` is designed to be used on `impl<$impl_generics>`, `decl_generics` for the type definition, so `struct Foo<$decl_generics>` and `ty_generics` whenever you use the type, so `Foo<$ty_generics>`. Here is an example that uses all three different types of generics: let (Generics { decl_generics, impl_generics, ty_generics }, rest) = parse_generics(input); quote! { struct Foo<$($decl_generics)*> { // ... } impl<$impl_generics> Foo<$ty_generics> { fn foo() { // ... } } } The next commit contains a fix to the `#[pin_data]` macro making it compatible with generic parameter default values by relying on this new behavior. Signed-off-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Link: https://lore.kernel.org/r/20240309155243.482334-1-benno.lossin@proton.me Signed-off-by: Miguel Ojeda <ojeda@kernel.org>		2024-04-07 22:03:42 +02:00
..
concat_idents.rs
helpers.rs	rust: macros: add decl_generics to parse_generics()	2024-04-07 22:03:42 +02:00
lib.rs	rust: support srctree-relative links	2023-12-21 20:54:17 +01:00
module.rs	rust: module: place generated init_module() function in .init.text	2024-02-25 19:17:31 +01:00
paste.rs	rust: macros: update 'paste!' macro to accept string literals	2023-12-14 20:14:01 +01:00
pin_data.rs	rust: macros: add decl_generics to parse_generics()	2024-04-07 22:03:42 +02:00
pinned_drop.rs	rust: init: add PinnedDrop trait and macros	2023-04-12 18:41:05 +02:00
quote.rs	rust: add derive macro for Zeroable	2023-08-21 14:31:48 +02:00
vtable.rs	rust: macros: vtable: fix HAS_* redefinition (gen_const_name)	2023-08-09 21:15:07 +02:00
zeroable.rs	rust: macros: add decl_generics to parse_generics()	2024-04-07 22:03:42 +02:00