diff options
Diffstat (limited to 'rust/macros')
| -rw-r--r-- | rust/macros/fmt.rs | 94 | ||||
| -rw-r--r-- | rust/macros/lib.rs | 19 | ||||
| -rw-r--r-- | rust/macros/module.rs | 10 | ||||
| -rw-r--r-- | rust/macros/quote.rs | 7 |
4 files changed, 129 insertions, 1 deletions
diff --git a/rust/macros/fmt.rs b/rust/macros/fmt.rs new file mode 100644 index 000000000000..2f4b9f6e2211 --- /dev/null +++ b/rust/macros/fmt.rs @@ -0,0 +1,94 @@ +// SPDX-License-Identifier: GPL-2.0 + +use proc_macro::{Ident, TokenStream, TokenTree}; +use std::collections::BTreeSet; + +/// Please see [`crate::fmt`] for documentation. +pub(crate) fn fmt(input: TokenStream) -> TokenStream { + let mut input = input.into_iter(); + + let first_opt = input.next(); + let first_owned_str; + let mut names = BTreeSet::new(); + let first_span = { + let Some((mut first_str, first_span)) = (match first_opt.as_ref() { + Some(TokenTree::Literal(first_lit)) => { + first_owned_str = first_lit.to_string(); + Some(first_owned_str.as_str()).and_then(|first| { + let first = first.strip_prefix('"')?; + let first = first.strip_suffix('"')?; + Some((first, first_lit.span())) + }) + } + _ => None, + }) else { + return first_opt.into_iter().chain(input).collect(); + }; + + // Parse `identifier`s from the format string. + // + // See https://doc.rust-lang.org/std/fmt/index.html#syntax. + while let Some((_, rest)) = first_str.split_once('{') { + first_str = rest; + if let Some(rest) = first_str.strip_prefix('{') { + first_str = rest; + continue; + } + if let Some((name, rest)) = first_str.split_once('}') { + first_str = rest; + let name = name.split_once(':').map_or(name, |(name, _)| name); + if !name.is_empty() && !name.chars().all(|c| c.is_ascii_digit()) { + names.insert(name); + } + } + } + first_span + }; + + let adapter = quote_spanned!(first_span => ::kernel::fmt::Adapter); + + let mut args = TokenStream::from_iter(first_opt); + { + let mut flush = |args: &mut TokenStream, current: &mut TokenStream| { + let current = std::mem::take(current); + if !current.is_empty() { + let (lhs, rhs) = (|| { + let mut current = current.into_iter(); + let mut acc = TokenStream::new(); + while let Some(tt) = current.next() { + // Split on `=` only once to handle cases like `a = b = c`. + if matches!(&tt, TokenTree::Punct(p) if p.as_char() == '=') { + names.remove(acc.to_string().as_str()); + // Include the `=` itself to keep the handling below uniform. + acc.extend([tt]); + return (Some(acc), current.collect::<TokenStream>()); + } + acc.extend([tt]); + } + (None, acc) + })(); + args.extend(quote_spanned!(first_span => #lhs #adapter(&#rhs))); + } + }; + + let mut current = TokenStream::new(); + for tt in input { + match &tt { + TokenTree::Punct(p) if p.as_char() == ',' => { + flush(&mut args, &mut current); + &mut args + } + _ => &mut current, + } + .extend([tt]); + } + flush(&mut args, &mut current); + } + + for name in names { + let name = Ident::new(name, first_span); + args.extend(quote_spanned!(first_span => , #name = #adapter(&#name))); + } + + quote_spanned!(first_span => ::core::format_args!(#args)) +} diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs index fa847cf3a9b5..793f712dbf7c 100644 --- a/rust/macros/lib.rs +++ b/rust/macros/lib.rs @@ -15,6 +15,7 @@ mod quote; mod concat_idents; mod export; +mod fmt; mod helpers; mod kunit; mod module; @@ -201,6 +202,24 @@ pub fn export(attr: TokenStream, ts: TokenStream) -> TokenStream { export::export(attr, ts) } +/// Like [`core::format_args!`], but automatically wraps arguments in [`kernel::fmt::Adapter`]. +/// +/// This macro allows generating `fmt::Arguments` while ensuring that each argument is wrapped with +/// `::kernel::fmt::Adapter`, which customizes formatting behavior for kernel logging. +/// +/// Named arguments used in the format string (e.g. `{foo}`) are detected and resolved from local +/// bindings. All positional and named arguments are automatically wrapped. +/// +/// This macro is an implementation detail of other kernel logging macros like [`pr_info!`] and +/// should not typically be used directly. +/// +/// [`kernel::fmt::Adapter`]: ../kernel/fmt/struct.Adapter.html +/// [`pr_info!`]: ../kernel/macro.pr_info.html +#[proc_macro] +pub fn fmt(input: TokenStream) -> TokenStream { + fmt::fmt(input) +} + /// Concatenate two identifiers. /// /// This is useful in macros that need to declare or reference items with names diff --git a/rust/macros/module.rs b/rust/macros/module.rs index 5ee54a00c0b6..49131ff3e097 100644 --- a/rust/macros/module.rs +++ b/rust/macros/module.rs @@ -98,6 +98,7 @@ struct ModuleInfo { description: Option<String>, alias: Option<Vec<String>>, firmware: Option<Vec<String>>, + imports_ns: Option<Vec<String>>, } impl ModuleInfo { @@ -112,6 +113,7 @@ impl ModuleInfo { "license", "alias", "firmware", + "imports_ns", ]; const REQUIRED_KEYS: &[&str] = &["type", "name", "license"]; let mut seen_keys = Vec::new(); @@ -137,6 +139,7 @@ impl ModuleInfo { "license" => info.license = expect_string_ascii(it), "alias" => info.alias = Some(expect_string_array(it)), "firmware" => info.firmware = Some(expect_string_array(it)), + "imports_ns" => info.imports_ns = Some(expect_string_array(it)), _ => panic!("Unknown key \"{key}\". Valid keys are: {EXPECTED_KEYS:?}."), } @@ -195,6 +198,11 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream { modinfo.emit("firmware", &fw); } } + if let Some(imports) = info.imports_ns { + for ns in imports { + modinfo.emit("import_ns", &ns); + } + } // Built-in modules also export the `file` modinfo string. let file = @@ -228,7 +236,7 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream { type LocalModule = {type_}; impl ::kernel::ModuleMetadata for {type_} {{ - const NAME: &'static ::kernel::str::CStr = ::kernel::c_str!(\"{name}\"); + const NAME: &'static ::kernel::str::CStr = c\"{name}\"; }} // Double nested modules, since then nobody can access the public items inside. diff --git a/rust/macros/quote.rs b/rust/macros/quote.rs index acc140c18653..ddfc21577539 100644 --- a/rust/macros/quote.rs +++ b/rust/macros/quote.rs @@ -48,6 +48,7 @@ macro_rules! quote_spanned { ($span:expr => $($tt:tt)*) => {{ let mut tokens = ::proc_macro::TokenStream::new(); { + #[allow(unused_variables)] let span = $span; quote_spanned!(@proc tokens span $($tt)*); } @@ -146,6 +147,12 @@ macro_rules! quote_spanned { )]); quote_spanned!(@proc $v $span $($tt)*); }; + (@proc $v:ident $span:ident & $($tt:tt)*) => { + $v.extend([::proc_macro::TokenTree::Punct( + ::proc_macro::Punct::new('&', ::proc_macro::Spacing::Alone), + )]); + quote_spanned!(@proc $v $span $($tt)*); + }; (@proc $v:ident $span:ident _ $($tt:tt)*) => { $v.extend([::proc_macro::TokenTree::Ident( ::proc_macro::Ident::new("_", $span), |