Messages in this thread | | | Date | Thu, 30 Mar 2023 14:11:34 +0100 | From | Gary Guo <> | Subject | Re: [PATCH v3 01/13] rust: macros: add `quote!` macro |
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On Thu, 30 Mar 2023 13:42:29 +0200 Andreas Hindborg <nmi@metaspace.dk> wrote:
> y86-dev@protonmail.com writes: > > > From: Gary Guo <gary@garyguo.net> > > > > Add the `quote!` macro for creating `TokenStream`s directly via the > > given Rust tokens. It also supports repetitions using iterators. > > > > It will be used by the pin-init API proc-macros to generate code. > > > > Signed-off-by: Gary Guo <gary@garyguo.net> > > Signed-off-by: Benno Lossin <y86-dev@protonmail.com> > > --- > > rust/macros/lib.rs | 2 + > > rust/macros/quote.rs | 145 +++++++++++++++++++++++++++++++++++++++++++ > > 2 files changed, 147 insertions(+) > > create mode 100644 rust/macros/quote.rs > > > > diff --git a/rust/macros/lib.rs b/rust/macros/lib.rs > > index c1d385e345b9..82b520f024dd 100644 > > --- a/rust/macros/lib.rs > > +++ b/rust/macros/lib.rs > > @@ -2,6 +2,8 @@ > > > > //! Crate for all kernel procedural macros. > > > > +#[macro_use] > > +mod quote; > > mod concat_idents; > > mod helpers; > > mod module; > > diff --git a/rust/macros/quote.rs b/rust/macros/quote.rs > > new file mode 100644 > > index 000000000000..7efb009c25a9 > > --- /dev/null > > +++ b/rust/macros/quote.rs > > @@ -0,0 +1,145 @@ > > +// SPDX-License-Identifier: Apache-2.0 OR MIT > > + > > +use proc_macro::{TokenStream, TokenTree}; > > + > > +pub(crate) trait ToTokens { > > + fn to_tokens(&self, tokens: &mut TokenStream); > > +} > > + > > +impl<T: ToTokens> ToTokens for Option<T> { > > + fn to_tokens(&self, tokens: &mut TokenStream) { > > + if let Some(v) = self { > > + v.to_tokens(tokens); > > + } > > + } > > +} > > + > > +impl ToTokens for proc_macro::Group { > > + fn to_tokens(&self, tokens: &mut TokenStream) { > > + tokens.extend([TokenTree::from(self.clone())]); > > + } > > +} > > + > > +impl ToTokens for TokenTree { > > + fn to_tokens(&self, tokens: &mut TokenStream) { > > + tokens.extend([self.clone()]); > > + } > > +} > > + > > +impl ToTokens for TokenStream { > > + fn to_tokens(&self, tokens: &mut TokenStream) { > > + tokens.extend(self.clone()); > > + } > > +} > > + > > +/// Converts tokens into [`proc_macro::TokenStream`] and performs variable interpolations with > > +/// the given span. > > +/// > > +/// This is a similar to the > > +/// [`quote_spanned!`](https://docs.rs/quote/latest/quote/macro.quote_spanned.html) macro from the > > +/// `quote` crate but provides only just enough functionality needed by the current `macros` crate. > > +#[allow(unused_macros)] > > +macro_rules! quote_spanned { > > + ($span:expr => $($tt:tt)*) => { > > + #[allow(clippy::vec_init_then_push)] > > + { > > + let mut tokens = Vec::new(); > > + let span = $span; > > + quote_spanned!(@proc tokens span $($tt)*); > > + proc_macro::TokenStream::from_iter(tokens) > > Should this be `::alloc::vec::Vec` and > `::proc_macro::TokenStream::from_iter` ? > > Best regards, > Andreas
Hi Andres,
This macro is used only internally, so I didn't really bother to fully qualify all the names.
Best, Gary
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