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authorTrevor Gross <tmgross@umich.edu>2023-11-17 20:39:59 -0500
committerMiguel Ojeda <ojeda@kernel.org>2023-12-14 20:14:01 +0100
commit2dc318ea9681c14c37bad2715097df4380a3c547 (patch)
tree08e7100ead1979309465902f09c227c0e736f5f2 /rust/macros
parent743766565dc0bdeedf7db419500031c7bdc84033 (diff)
rust: macros: update 'paste!' macro to accept string literals
Enable combining identifiers with literals in the 'paste!' macro. This allows combining user-specified strings with affixes to create namespaced identifiers. This sample code: macro_rules! m { ($name:lit) => { paste!(struct [<_some_ $name _struct_>] {}) } } m!("foo_bar"); Would previously cause a compilation error. It will now generate: struct _some_foo_bar_struct_ {} Signed-off-by: Trevor Gross <tmgross@umich.edu> Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com> Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Reviewed-by: Benno Lossin <benno.lossin@proton.me> Reviewed-by: Gary Guo <gary@garyguo.net> Link: https://lore.kernel.org/r/20231118013959.37384-1-tmgross@umich.edu [ Added `:` before example block. ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust/macros')
-rw-r--r--rust/macros/lib.rs22
-rw-r--r--rust/macros/paste.rs10
2 files changed, 29 insertions, 3 deletions
diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs
index c42105c2ff96..125f5ea74a16 100644
--- a/rust/macros/lib.rs
+++ b/rust/macros/lib.rs
@@ -254,8 +254,8 @@ pub fn pinned_drop(args: TokenStream, input: TokenStream) -> TokenStream {
/// Within the `paste!` macro, identifiers inside `[<` and `>]` are concatenated together to form a
/// single identifier.
///
-/// This is similar to the [`paste`] crate, but with pasting feature limited to identifiers
-/// (literals, lifetimes and documentation strings are not supported). There is a difference in
+/// This is similar to the [`paste`] crate, but with pasting feature limited to identifiers and
+/// literals (lifetimes and documentation strings are not supported). There is a difference in
/// supported modifiers as well.
///
/// # Example
@@ -337,6 +337,24 @@ pub fn pinned_drop(args: TokenStream, input: TokenStream) -> TokenStream {
/// assert_eq!(br_ok(), binder_driver_return_protocol_BR_OK);
/// ```
///
+/// # Literals
+///
+/// Literals can also be concatenated with other identifiers:
+///
+/// ```ignore
+/// macro_rules! create_numbered_fn {
+/// ($name:literal, $val:literal) => {
+/// kernel::macros::paste! {
+/// fn [<some_ $name _fn $val>]() -> u32 { $val }
+/// }
+/// };
+/// }
+///
+/// create_numbered_fn!("foo", 100);
+///
+/// assert_eq!(some_foo_fn100(), 100)
+/// ```
+///
/// [`paste`]: https://docs.rs/paste/
#[proc_macro]
pub fn paste(input: TokenStream) -> TokenStream {
diff --git a/rust/macros/paste.rs b/rust/macros/paste.rs
index 385a78434224..f40d42b35b58 100644
--- a/rust/macros/paste.rs
+++ b/rust/macros/paste.rs
@@ -9,7 +9,15 @@ fn concat(tokens: &[TokenTree], group_span: Span) -> TokenTree {
loop {
match tokens.next() {
None => break,
- Some(TokenTree::Literal(lit)) => segments.push((lit.to_string(), lit.span())),
+ Some(TokenTree::Literal(lit)) => {
+ // Allow us to concat string literals by stripping quotes
+ let mut value = lit.to_string();
+ if value.starts_with('"') && value.ends_with('"') {
+ value.remove(0);
+ value.pop();
+ }
+ segments.push((value, lit.span()));
+ }
Some(TokenTree::Ident(ident)) => {
let mut value = ident.to_string();
if value.starts_with("r#") {