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authorGary Guo <gary@garyguo.net>2022-11-10 17:41:19 +0100
committerMiguel Ojeda <ojeda@kernel.org>2022-12-04 01:59:15 +0100
commitb13c9880f909ca5e406d9b3d061359fd8fb0c514 (patch)
tree9b59eb45b79a659a8ddc42e84ccbcd1c40e98c9b /rust
parentb44becc5ee808e02bbda0f90ee0584f206693a33 (diff)
rust: macros: take string literals in `module!`
Instead of taking binary string literals, take string ones instead, making it easier for users to define a module, i.e. instead of calling `module!` like: module! { ... name: b"rust_minimal", ... } now it is called as: module! { ... name: "rust_minimal", ... } Module names, aliases and license strings are restricted to ASCII only. However, the author and the description allows UTF-8. For simplicity (avoid parsing), escape sequences and raw string literals are not yet handled. Link: https://github.com/Rust-for-Linux/linux/issues/252 Link: https://lore.kernel.org/lkml/YukvvPOOu8uZl7+n@yadro.com/ Signed-off-by: Gary Guo <gary@garyguo.net> [Reworded, adapted for upstream and applied latest changes] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'rust')
-rw-r--r--rust/macros/helpers.rs24
-rw-r--r--rust/macros/lib.rs12
-rw-r--r--rust/macros/module.rs10
3 files changed, 29 insertions, 17 deletions
diff --git a/rust/macros/helpers.rs b/rust/macros/helpers.rs
index cdc7dc6135d2..cf7ad950dc1e 100644
--- a/rust/macros/helpers.rs
+++ b/rust/macros/helpers.rs
@@ -18,10 +18,16 @@ pub(crate) fn try_literal(it: &mut token_stream::IntoIter) -> Option<String> {
}
}
-pub(crate) fn try_byte_string(it: &mut token_stream::IntoIter) -> Option<String> {
- try_literal(it).and_then(|byte_string| {
- if byte_string.starts_with("b\"") && byte_string.ends_with('\"') {
- Some(byte_string[2..byte_string.len() - 1].to_string())
+pub(crate) fn try_string(it: &mut token_stream::IntoIter) -> Option<String> {
+ try_literal(it).and_then(|string| {
+ if string.starts_with('\"') && string.ends_with('\"') {
+ let content = &string[1..string.len() - 1];
+ if content.contains('\\') {
+ panic!("Escape sequences in string literals not yet handled");
+ }
+ Some(content.to_string())
+ } else if string.starts_with("r\"") {
+ panic!("Raw string literals are not yet handled");
} else {
None
}
@@ -40,8 +46,14 @@ pub(crate) fn expect_punct(it: &mut token_stream::IntoIter) -> char {
}
}
-pub(crate) fn expect_byte_string(it: &mut token_stream::IntoIter) -> String {
- try_byte_string(it).expect("Expected byte string")
+pub(crate) fn expect_string(it: &mut token_stream::IntoIter) -> String {
+ try_string(it).expect("Expected string")
+}
+
+pub(crate) fn expect_string_ascii(it: &mut token_stream::IntoIter) -> String {
+ let string = try_string(it).expect("Expected string");
+ assert!(string.is_ascii(), "Expected ASCII string");
+ string
}
pub(crate) fn expect_end(it: &mut token_stream::IntoIter) {
diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs
index e40caaf0a656..c1d385e345b9 100644
--- a/rust/macros/lib.rs
+++ b/rust/macros/lib.rs
@@ -25,20 +25,20 @@ use proc_macro::TokenStream;
///
/// module!{
/// type: MyModule,
-/// name: b"my_kernel_module",
-/// author: b"Rust for Linux Contributors",
-/// description: b"My very own kernel module!",
-/// license: b"GPL",
+/// name: "my_kernel_module",
+/// author: "Rust for Linux Contributors",
+/// description: "My very own kernel module!",
+/// license: "GPL",
/// params: {
/// my_i32: i32 {
/// default: 42,
/// permissions: 0o000,
-/// description: b"Example of i32",
+/// description: "Example of i32",
/// },
/// writeable_i32: i32 {
/// default: 42,
/// permissions: 0o644,
-/// description: b"Example of i32",
+/// description: "Example of i32",
/// },
/// },
/// }
diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index 186a5b8be23c..a7e363c2b044 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -108,11 +108,11 @@ impl ModuleInfo {
match key.as_str() {
"type" => info.type_ = expect_ident(it),
- "name" => info.name = expect_byte_string(it),
- "author" => info.author = Some(expect_byte_string(it)),
- "description" => info.description = Some(expect_byte_string(it)),
- "license" => info.license = expect_byte_string(it),
- "alias" => info.alias = Some(expect_byte_string(it)),
+ "name" => info.name = expect_string_ascii(it),
+ "author" => info.author = Some(expect_string(it)),
+ "description" => info.description = Some(expect_string(it)),
+ "license" => info.license = expect_string_ascii(it),
+ "alias" => info.alias = Some(expect_string_ascii(it)),
_ => panic!(
"Unknown key \"{}\". Valid keys are: {:?}.",
key, EXPECTED_KEYS