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779f6e3e1c
Currently, we generate `HAS_` constants as long as the definition exists in the source, regardless if it is cfg-ed out or not. Currently, uses of `#[cfg]` present in both trait and impl, so it is not a problem; however if only the impl side uses `#[cfg]` then `HAS_` constants will incorrectly be true while it shouldnt't. With `syn` support, we can now implement `#[cfg]` handling properly by propagating the `#[cfg]` attributes to the constants. Signed-off-by: Gary Guo <gary@garyguo.net> Reviewed-by: Benno Lossin <lossin@kernel.org> Link: https://patch.msgid.link/20260113170529.2240744-1-gary@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
61 lines
1.3 KiB
Rust
61 lines
1.3 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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use proc_macro2::TokenStream;
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use quote::ToTokens;
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use syn::{
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parse::{
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Parse,
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ParseStream, //
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},
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Attribute,
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Error,
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LitStr,
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Result, //
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};
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/// A string literal that is required to have ASCII value only.
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pub(crate) struct AsciiLitStr(LitStr);
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impl Parse for AsciiLitStr {
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fn parse(input: ParseStream<'_>) -> Result<Self> {
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let s: LitStr = input.parse()?;
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if !s.value().is_ascii() {
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return Err(Error::new_spanned(s, "expected ASCII-only string literal"));
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}
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Ok(Self(s))
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}
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}
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impl ToTokens for AsciiLitStr {
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fn to_tokens(&self, ts: &mut TokenStream) {
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self.0.to_tokens(ts);
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}
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}
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impl AsciiLitStr {
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pub(crate) fn value(&self) -> String {
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self.0.value()
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}
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}
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pub(crate) fn file() -> String {
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#[cfg(not(CONFIG_RUSTC_HAS_SPAN_FILE))]
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{
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proc_macro::Span::call_site()
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.source_file()
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.path()
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.to_string_lossy()
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.into_owned()
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}
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#[cfg(CONFIG_RUSTC_HAS_SPAN_FILE)]
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#[allow(clippy::incompatible_msrv)]
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{
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proc_macro::Span::call_site().file()
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}
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}
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/// Obtain all `#[cfg]` attributes.
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pub(crate) fn gather_cfg_attrs(attr: &[Attribute]) -> impl Iterator<Item = &Attribute> + '_ {
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attr.iter().filter(|a| a.path().is_ident("cfg"))
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}
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