From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DC93BC76188 for ; Mon, 3 Apr 2023 15:45:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233002AbjDCPpb (ORCPT ); Mon, 3 Apr 2023 11:45:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232624AbjDCPpO (ORCPT ); Mon, 3 Apr 2023 11:45:14 -0400 Received: from mail-4322.protonmail.ch (mail-4322.protonmail.ch [185.70.43.22]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D8962359E for ; Mon, 3 Apr 2023 08:45:08 -0700 (PDT) Date: Mon, 03 Apr 2023 15:44:52 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.com; s=protonmail3; t=1680536706; x=1680795906; bh=AMuWjkxzcUWLgTzTEeseuhGO2kwBxdlzp32Z0NPgb3A=; h=Date:To:From:Cc:Subject:Message-ID:In-Reply-To:References: Feedback-ID:From:To:Cc:Date:Subject:Reply-To:Feedback-ID: Message-ID:BIMI-Selector; b=LCb7eZzAfWAwgvOarVHmTDm5vr5yfQHAUeghhR5KVCaQnur2FFvHwZdWEtBHi50Un dcyrHpibC0rLvx+GsAa5kQZalsG532NaskMn33A9RYyuRPyB5svWKxgzXEf/ZO4VIH z4HMZb6I/P+Y+3jE1ofXaWgp4sYC8wJNI6KLehatHeDG8Ikxl/VE3eTnIQuAau9xpJ STqZN7VkfE/o3fhAkxdS3CW1PgSEZqPeuYrqEvSHxqLF5S1kXaJtXqMgwPDi0lvczv HGjLoDC5nbrA0Y6/mgmvaCubA0CozkW8Nc2Xi1mkvdsNzutswgPg/t0I+rY4W+lsC1 AeUg00+RtTyoA== To: Miguel Ojeda , Alex Gaynor , Wedson Almeida Filho , Boqun Feng , Gary Guo , =?utf-8?Q?Bj=C3=B6rn_Roy_Baron?= , Alice Ryhl From: Benno Lossin Cc: rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org, patches@lists.linux.dev, Benno Lossin , Andreas Hindborg , Alice Ryhl Subject: [PATCH v5 02/15] rust: macros: add `quote!` macro Message-ID: <20230403154422.168633-3-y86-dev@protonmail.com> In-Reply-To: <20230403154422.168633-1-y86-dev@protonmail.com> References: <20230403154422.168633-1-y86-dev@protonmail.com> Feedback-ID: 40624463:user:proton MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: rust-for-linux@vger.kernel.org From: Gary Guo 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 Signed-off-by: Benno Lossin Reviewed-by: Andreas Hindborg Cc: Alice Ryhl --- 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..94a6277182ee --- /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 ToTokens for Option { + fn to_tokens(&self, tokens: &mut TokenStream) { + if let Some(v) =3D 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_span= ned.html) macro from the +/// `quote` crate but provides only just enough functionality needed by th= e current `macros` crate. +#[allow(unused_macros)] +macro_rules! quote_spanned { + ($span:expr =3D> $($tt:tt)*) =3D> { + #[allow(clippy::vec_init_then_push)] + { + let mut tokens =3D ::std::vec::Vec::new(); + let span =3D $span; + quote_spanned!(@proc tokens span $($tt)*); + ::proc_macro::TokenStream::from_iter(tokens) + }}; + (@proc $v:ident $span:ident) =3D> {}; + (@proc $v:ident $span:ident #$id:ident $($tt:tt)*) =3D> { + let mut ts =3D ::proc_macro::TokenStream::new(); + $crate::quote::ToTokens::to_tokens(&$id, &mut ts); + $v.extend(ts); + quote_spanned!(@proc $v $span $($tt)*); + }; + (@proc $v:ident $span:ident #(#$id:ident)* $($tt:tt)*) =3D> { + for token in $id { + let mut ts =3D ::proc_macro::TokenStream::new(); + $crate::quote::ToTokens::to_tokens(&token, &mut ts); + $v.extend(ts); + } + quote_spanned!(@proc $v $span $($tt)*); + }; + (@proc $v:ident $span:ident ( $($inner:tt)* ) $($tt:tt)*) =3D> { + let mut tokens =3D ::std::vec::Vec::new(); + quote_spanned!(@proc tokens $span $($inner)*); + $v.push(::proc_macro::TokenTree::Group(::proc_macro::Group::new( + ::proc_macro::Delimiter::Parenthesis, + ::proc_macro::TokenStream::from_iter(tokens) + ))); + quote_spanned!(@proc $v $span $($tt)*); + }; + (@proc $v:ident $span:ident [ $($inner:tt)* ] $($tt:tt)*) =3D> { + let mut tokens =3D ::std::vec::Vec::new(); + quote_spanned!(@proc tokens $span $($inner)*); + $v.push(::proc_macro::TokenTree::Group(::proc_macro::Group::new( + ::proc_macro::Delimiter::Bracket, + ::proc_macro::TokenStream::from_iter(tokens) + ))); + quote_spanned!(@proc $v $span $($tt)*); + }; + (@proc $v:ident $span:ident { $($inner:tt)* } $($tt:tt)*) =3D> { + let mut tokens =3D ::std::vec::Vec::new(); + quote_spanned!(@proc tokens $span $($inner)*); + $v.push(::proc_macro::TokenTree::Group(::proc_macro::Group::new( + ::proc_macro::Delimiter::Brace, + ::proc_macro::TokenStream::from_iter(tokens) + ))); + quote_spanned!(@proc $v $span $($tt)*); + }; + (@proc $v:ident $span:ident :: $($tt:tt)*) =3D> { + $v.push(::proc_macro::TokenTree::Punct( + ::proc_macro::Punct::new(':', ::proc_macro::Spacing::Joint= ) + )); + $v.push(::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)*) =3D> { + $v.push(::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)*) =3D> { + $v.push(::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)*) =3D> { + $v.push(::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)*) =3D> { + $v.push(::proc_macro::TokenTree::Punct( + ::proc_macro::Punct::new('!', ::proc_macro::Spacing::Alone= ) + )); + quote_spanned!(@proc $v $span $($tt)*); + }; + (@proc $v:ident $span:ident $id:ident $($tt:tt)*) =3D> { + $v.push(::proc_macro::TokenTree::Ident(::proc_macro::Ident::new(st= ringify!($id), $span))); + quote_spanned!(@proc $v $span $($tt)*); + }; +} + +/// Converts tokens into [`proc_macro::TokenStream`] and performs variable= interpolations with +/// mixed site span ([`Span::mixed_site()`]). +/// +/// This is a similar to the [`quote!`](https://docs.rs/quote/latest/quote= /macro.quote.html) macro +/// from the `quote` crate but provides only just enough functionality nee= ded by the current +/// `macros` crate. +/// +/// [`Span::mixed_site()`]: https://doc.rust-lang.org/proc_macro/struct.Sp= an.html#method.mixed_site +#[allow(unused_macros)] +macro_rules! quote { + ($($tt:tt)*) =3D> { + quote_spanned!(::proc_macro::Span::mixed_site() =3D> $($tt)*) + } +} -- 2.39.2