Merge patch series "syn support"

This patch series introduces support for `syn` (and its dependencies): Syn is a parsing library for parsing a stream of Rust tokens into a syntax tree of Rust source code. Currently this library is geared toward use in Rust procedural macros, but contains some APIs that may be useful more generally. It is the most downloaded Rust crate (according to crates.io), and it is also used by the Rust compiler itself. Having such support allows to greatly simplify writing complex macros such as `pin-init`. We will use it in the `macros` crate too. Benno has already prepared the `pin-init` version based on this, and on top of that, we will be able to simplify the `macros` crate too. I think Jesung is working on updating the `TryFrom` and `Into` upcoming derive macros to use `syn` too. The series starts with a few preparation commits (two fixes were already merged in mainline that were discovered by this series), then each crate is added. Finally, support for using the new crates from our `macros` crate is introduced. This has been a long time coming, e.g. even before Rust for Linux was merged into the Linux kernel, Gary and Benno have wanted to use `syn`. The first iterations of this, from 2022 and 2023 (with `serde` too, another popular crate), are at: https://github.com/Rust-for-Linux/linux/pull/910 https://github.com/Rust-for-Linux/linux/pull/1007 After those, we considered picking these from the distributions where possible. However, after discussing it, it is not really worth the complexity: vendoring makes things less complex and is less fragile. In particular, we avoid having to support and test several versions, we avoid having to introduce Cargo just to properly fetch the right versions from the registry, we can easily customize the crates if needed (e.g. dropping the `unicode_idents` dependency like it is done in this series) and we simplify the configuration of the build for users for which the "default" paths/registries would not have worked. Moreover, nowadays, the ~57k lines introduced are not that much compared to years ago (it dwarfed the actual Rust kernel code). Moreover, back then it wasn't clear the Rust experiment would be a success, so it would have been a bit pointless/risky to add many lines for nothing. Our macro needs were also smaller in the early days. So, finally, in Kangrejos 2025 we discussed going with the original, simpler approach. Thus here it is the result. There should not be many updates needed for these, and even if there are, they should not be too big, e.g. +7k -3k lines across the 3 crates in the last year. Note that `syn` does not have all the features enabled, since we do not need them so far, but they can easily be enabled just adding them to the list. Link: https://patch.msgid.link/20251124151837.2184382-1-ojeda@kernel.org Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2026-11-10 20:48:12 +00:00 · 2025-11-24 17:16:04 +01:00 · 2025-11-24 17:16:04 +01:00 · 54e3eae855
commit 54e3eae855
parent 7a0eae4d43 52ba807f1a
82 changed files with 57906 additions and 17 deletions
--- a/.gitignore
+++ b/.gitignore
--- a/7
+++ b/7
--- a/rust/Makefile
+++ b/rust/Makefile
--- a/rust/proc-macro2/README.md
+++ b/rust/proc-macro2/README.md
--- a/rust/proc-macro2/detection.rs
+++ b/rust/proc-macro2/detection.rs
--- a/rust/proc-macro2/extra.rs
+++ b/rust/proc-macro2/extra.rs
--- a/rust/proc-macro2/fallback.rs
+++ b/rust/proc-macro2/fallback.rs
--- a/rust/proc-macro2/lib.rs
+++ b/rust/proc-macro2/lib.rs
--- a/rust/proc-macro2/location.rs
+++ b/rust/proc-macro2/location.rs
--- a/rust/proc-macro2/marker.rs
+++ b/rust/proc-macro2/marker.rs
--- a/rust/proc-macro2/parse.rs
+++ b/rust/proc-macro2/parse.rs
--- a/rust/proc-macro2/probe.rs
+++ b/rust/proc-macro2/probe.rs
--- a/rust/proc-macro2/probe/proc_macro_span.rs
+++ b/rust/proc-macro2/probe/proc_macro_span.rs
--- a/rust/proc-macro2/probe/proc_macro_span_file.rs
+++ b/rust/proc-macro2/probe/proc_macro_span_file.rs
--- a/rust/proc-macro2/probe/proc_macro_span_location.rs
+++ b/rust/proc-macro2/probe/proc_macro_span_location.rs
--- a/rust/proc-macro2/rcvec.rs
+++ b/rust/proc-macro2/rcvec.rs
--- a/rust/proc-macro2/wrapper.rs
+++ b/rust/proc-macro2/wrapper.rs
--- a/rust/quote/README.md
+++ b/rust/quote/README.md
--- a/rust/quote/ext.rs
+++ b/rust/quote/ext.rs
--- a/rust/quote/format.rs
+++ b/rust/quote/format.rs
--- a/rust/quote/ident_fragment.rs
+++ b/rust/quote/ident_fragment.rs
--- a/rust/quote/lib.rs
+++ b/rust/quote/lib.rs
--- a/rust/quote/runtime.rs
+++ b/rust/quote/runtime.rs
--- a/rust/quote/spanned.rs
+++ b/rust/quote/spanned.rs
--- a/rust/quote/to_tokens.rs
+++ b/rust/quote/to_tokens.rs
--- a/rust/syn/README.md
+++ b/rust/syn/README.md
--- a/rust/syn/attr.rs
+++ b/rust/syn/attr.rs
--- a/rust/syn/bigint.rs
+++ b/rust/syn/bigint.rs
--- a/rust/syn/buffer.rs
+++ b/rust/syn/buffer.rs
--- a/rust/syn/classify.rs
+++ b/rust/syn/classify.rs
--- a/rust/syn/custom_keyword.rs
+++ b/rust/syn/custom_keyword.rs
--- a/rust/syn/custom_punctuation.rs
+++ b/rust/syn/custom_punctuation.rs
--- a/rust/syn/data.rs
+++ b/rust/syn/data.rs
--- a/rust/syn/derive.rs
+++ b/rust/syn/derive.rs
--- a/rust/syn/discouraged.rs
+++ b/rust/syn/discouraged.rs
--- a/rust/syn/drops.rs
+++ b/rust/syn/drops.rs
--- a/rust/syn/error.rs
+++ b/rust/syn/error.rs
--- a/rust/syn/export.rs
+++ b/rust/syn/export.rs
--- a/rust/syn/expr.rs
+++ b/rust/syn/expr.rs
--- a/rust/syn/ext.rs
+++ b/rust/syn/ext.rs
--- a/rust/syn/file.rs
+++ b/rust/syn/file.rs
--- a/rust/syn/fixup.rs
+++ b/rust/syn/fixup.rs
--- a/rust/syn/gen/clone.rs
+++ b/rust/syn/gen/clone.rs
--- a/rust/syn/gen/debug.rs
+++ b/rust/syn/gen/debug.rs
--- a/rust/syn/gen/eq.rs
+++ b/rust/syn/gen/eq.rs
--- a/rust/syn/gen/fold.rs
+++ b/rust/syn/gen/fold.rs
--- a/rust/syn/gen/hash.rs
+++ b/rust/syn/gen/hash.rs
--- a/rust/syn/gen/visit.rs
+++ b/rust/syn/gen/visit.rs
--- a/rust/syn/gen/visit_mut.rs
+++ b/rust/syn/gen/visit_mut.rs
--- a/rust/syn/generics.rs
+++ b/rust/syn/generics.rs
--- a/rust/syn/group.rs
+++ b/rust/syn/group.rs
--- a/rust/syn/ident.rs
+++ b/rust/syn/ident.rs
--- a/rust/syn/item.rs
+++ b/rust/syn/item.rs
--- a/rust/syn/lib.rs
+++ b/rust/syn/lib.rs
--- a/rust/syn/lifetime.rs
+++ b/rust/syn/lifetime.rs
--- a/rust/syn/lit.rs
+++ b/rust/syn/lit.rs
--- a/rust/syn/lookahead.rs
+++ b/rust/syn/lookahead.rs
--- a/rust/syn/mac.rs
+++ b/rust/syn/mac.rs
--- a/rust/syn/macros.rs
+++ b/rust/syn/macros.rs
--- a/rust/syn/meta.rs
+++ b/rust/syn/meta.rs
--- a/rust/syn/op.rs
+++ b/rust/syn/op.rs
--- a/rust/syn/parse.rs
+++ b/rust/syn/parse.rs
--- a/rust/syn/parse_macro_input.rs
+++ b/rust/syn/parse_macro_input.rs
--- a/rust/syn/parse_quote.rs
+++ b/rust/syn/parse_quote.rs
--- a/rust/syn/pat.rs
+++ b/rust/syn/pat.rs
--- a/rust/syn/path.rs
+++ b/rust/syn/path.rs
--- a/rust/syn/precedence.rs
+++ b/rust/syn/precedence.rs
--- a/rust/syn/print.rs
+++ b/rust/syn/print.rs
--- a/rust/syn/punctuated.rs
+++ b/rust/syn/punctuated.rs
--- a/rust/syn/restriction.rs
+++ b/rust/syn/restriction.rs
--- a/rust/syn/scan_expr.rs
+++ b/rust/syn/scan_expr.rs
--- a/rust/syn/sealed.rs
+++ b/rust/syn/sealed.rs
--- a/rust/syn/span.rs
+++ b/rust/syn/span.rs
--- a/rust/syn/spanned.rs
+++ b/rust/syn/spanned.rs
--- a/rust/syn/stmt.rs
+++ b/rust/syn/stmt.rs
--- a/rust/syn/thread.rs
+++ b/rust/syn/thread.rs
--- a/rust/syn/token.rs
+++ b/rust/syn/token.rs
--- a/rust/syn/tt.rs
+++ b/rust/syn/tt.rs
--- a/rust/syn/ty.rs
+++ b/rust/syn/ty.rs
--- a/rust/syn/verbatim.rs
+++ b/rust/syn/verbatim.rs
--- a/rust/syn/whitespace.rs
+++ b/rust/syn/whitespace.rs
--- a/scripts/generate_rust_analyzer.py
+++ b/scripts/generate_rust_analyzer.py