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Message-Id: <20250710-cstr-core-v14-1-ca7e0ca82c82@gmail.com>
Date: Thu, 10 Jul 2025 10:53:29 -0400
From: Tamir Duberstein <tamird@...il.com>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
Björn Roy Baron <bjorn3_gh@...tonmail.com>,
Benno Lossin <lossin@...nel.org>, Andreas Hindborg <a.hindborg@...nel.org>,
Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
Danilo Krummrich <dakr@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Luis Chamberlain <mcgrof@...nel.org>, Russ Weight <russ.weight@...ux.dev>,
Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
Christian Brauner <brauner@...nel.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
llvm@...ts.linux.dev, Tamir Duberstein <tamird@...il.com>
Subject: [PATCH v14 1/3] rust: macros: reduce collections in `quote!` macro
Remove a handful of unncessary intermediate vectors and token streams;
mainly the top-level stream can be directly extended with the notable
exception of groups.
Remove an unnecessary `#[allow(dead_code)]` added in commit dbd5058ba60c
("rust: make pin-init its own crate").
Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Tamir Duberstein <tamird@...il.com>
---
rust/macros/quote.rs | 104 ++++++++++++++++++++++++---------------------------
1 file changed, 49 insertions(+), 55 deletions(-)
diff --git a/rust/macros/quote.rs b/rust/macros/quote.rs
index 92cacc4067c9..acc140c18653 100644
--- a/rust/macros/quote.rs
+++ b/rust/macros/quote.rs
@@ -2,7 +2,6 @@
use proc_macro::{TokenStream, TokenTree};
-#[allow(dead_code)]
pub(crate) trait ToTokens {
fn to_tokens(&self, tokens: &mut TokenStream);
}
@@ -47,121 +46,116 @@ fn to_tokens(&self, tokens: &mut TokenStream) {
/// `quote` crate but provides only just enough functionality needed by the current `macros` crate.
macro_rules! quote_spanned {
($span:expr => $($tt:tt)*) => {{
- let mut tokens: ::std::vec::Vec<::proc_macro::TokenTree>;
- #[allow(clippy::vec_init_then_push)]
+ let mut tokens = ::proc_macro::TokenStream::new();
{
- tokens = ::std::vec::Vec::new();
let span = $span;
quote_spanned!(@proc tokens span $($tt)*);
}
- ::proc_macro::TokenStream::from_iter(tokens)
+ tokens
}};
(@proc $v:ident $span:ident) => {};
(@proc $v:ident $span:ident #$id:ident $($tt:tt)*) => {
- let mut ts = ::proc_macro::TokenStream::new();
- $crate::quote::ToTokens::to_tokens(&$id, &mut ts);
- $v.extend(ts);
+ $crate::quote::ToTokens::to_tokens(&$id, &mut $v);
quote_spanned!(@proc $v $span $($tt)*);
};
(@proc $v:ident $span:ident #(#$id:ident)* $($tt:tt)*) => {
for token in $id {
- let mut ts = ::proc_macro::TokenStream::new();
- $crate::quote::ToTokens::to_tokens(&token, &mut ts);
- $v.extend(ts);
+ $crate::quote::ToTokens::to_tokens(&token, &mut $v);
}
quote_spanned!(@proc $v $span $($tt)*);
};
(@proc $v:ident $span:ident ( $($inner:tt)* ) $($tt:tt)*) => {
#[allow(unused_mut)]
- let mut tokens = ::std::vec::Vec::<::proc_macro::TokenTree>::new();
+ let mut tokens = ::proc_macro::TokenStream::new();
quote_spanned!(@proc tokens $span $($inner)*);
- $v.push(::proc_macro::TokenTree::Group(::proc_macro::Group::new(
+ $v.extend([::proc_macro::TokenTree::Group(::proc_macro::Group::new(
::proc_macro::Delimiter::Parenthesis,
- ::proc_macro::TokenStream::from_iter(tokens)
- )));
+ tokens,
+ ))]);
quote_spanned!(@proc $v $span $($tt)*);
};
(@proc $v:ident $span:ident [ $($inner:tt)* ] $($tt:tt)*) => {
- let mut tokens = ::std::vec::Vec::new();
+ let mut tokens = ::proc_macro::TokenStream::new();
quote_spanned!(@proc tokens $span $($inner)*);
- $v.push(::proc_macro::TokenTree::Group(::proc_macro::Group::new(
+ $v.extend([::proc_macro::TokenTree::Group(::proc_macro::Group::new(
::proc_macro::Delimiter::Bracket,
- ::proc_macro::TokenStream::from_iter(tokens)
- )));
+ tokens,
+ ))]);
quote_spanned!(@proc $v $span $($tt)*);
};
(@proc $v:ident $span:ident { $($inner:tt)* } $($tt:tt)*) => {
- let mut tokens = ::std::vec::Vec::new();
+ let mut tokens = ::proc_macro::TokenStream::new();
quote_spanned!(@proc tokens $span $($inner)*);
- $v.push(::proc_macro::TokenTree::Group(::proc_macro::Group::new(
+ $v.extend([::proc_macro::TokenTree::Group(::proc_macro::Group::new(
::proc_macro::Delimiter::Brace,
- ::proc_macro::TokenStream::from_iter(tokens)
- )));
+ tokens,
+ ))]);
quote_spanned!(@proc $v $span $($tt)*);
};
(@proc $v:ident $span:ident :: $($tt:tt)*) => {
- $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)
- ));
+ $v.extend([::proc_macro::Spacing::Joint, ::proc_macro::Spacing::Alone].map(|spacing| {
+ ::proc_macro::TokenTree::Punct(::proc_macro::Punct::new(':', spacing))
+ }));
quote_spanned!(@proc $v $span $($tt)*);
};
(@proc $v:ident $span:ident : $($tt:tt)*) => {
- $v.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new(':', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new(',', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new('@', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new('!', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new(';', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new('+', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new('=', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Punct(
- ::proc_macro::Punct::new('#', ::proc_macro::Spacing::Alone)
- ));
+ $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.push(::proc_macro::TokenTree::Ident(::proc_macro::Ident::new("_", $span)));
+ $v.extend([::proc_macro::TokenTree::Ident(
+ ::proc_macro::Ident::new("_", $span),
+ )]);
quote_spanned!(@proc $v $span $($tt)*);
};
(@proc $v:ident $span:ident $id:ident $($tt:tt)*) => {
- $v.push(::proc_macro::TokenTree::Ident(::proc_macro::Ident::new(stringify!($id), $span)));
+ $v.extend([::proc_macro::TokenTree::Ident(
+ ::proc_macro::Ident::new(stringify!($id), $span),
+ )]);
quote_spanned!(@proc $v $span $($tt)*);
};
}
--
2.50.0
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