rust: zerocopy: update to v0.8.52

index d693a63b7645..66d820f6ad4c 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 use proc_macro2::{Span, TokenStream};
 use syn::{
     parse_quote, Data, DataEnum, DataStruct, DataUnion, Error, Expr, ExprLit, ExprUnary, Lit, UnOp,

index ad52a6b45d28..0103a78d087f 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 use proc_macro2::{Span, TokenStream};
 use quote::quote;
 use syn::{Data, DataEnum, DataStruct, DataUnion, Error, Type};

index fddffd167c82..d0c4cecfff15 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 use proc_macro2::TokenStream;
 use quote::quote;
 use syn::{parse_quote, Data, Error, Type};

@@ -87,7 +87,6 @@ fn pointer_to_metadata(ptr: *mut Self) -> <Self as #zerocopy_crate::KnownLayout>
     };
 
     let inner_extras = {
-        let leading_fields_tys = leading_fields_tys.clone();
         let methods = make_methods(*trailing_field_ty);
         let (_, ty_generics, _) = ctx.ast.generics.split_for_impl();
 

index 665ba7da55a8..b3839fcf73c9 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 pub mod from_bytes;
 pub mod into_bytes;
 pub mod known_layout;

@@ -15,8 +15,8 @@
     util::{Ctx, DataExt, FieldBounds, ImplBlockBuilder, Trait},
 };
 
-pub(crate) fn derive_immutable(ctx: &Ctx, _top_level: Trait) -> TokenStream {
-    match &ctx.ast.data {
+pub(crate) fn derive_immutable(ctx: &Ctx, _top_level: Trait) -> Result<TokenStream, Error> {
+    Ok(match &ctx.ast.data {
         Data::Struct(strct) => {
             ImplBlockBuilder::new(ctx, strct, Trait::Immutable, FieldBounds::ALL_SELF).build()
         }

@@ -26,7 +26,7 @@ pub(crate) fn derive_immutable(ctx: &Ctx, _top_level: Trait) -> TokenStream {
         Data::Union(unn) => {
             ImplBlockBuilder::new(ctx, unn, Trait::Immutable, FieldBounds::ALL_SELF).build()
         }
-    }
+    })
 }
 
 pub(crate) fn derive_hash(ctx: &Ctx, _top_level: Trait) -> Result<TokenStream, Error> {

@@ -97,16 +97,20 @@ pub(crate) fn derive_split_at(ctx: &Ctx, _top_level: Trait) -> Result<TokenStrea
     match &ctx.ast.data {
         Data::Struct(_) => {}
         Data::Enum(_) | Data::Union(_) => {
-            return Err(Error::new(Span::call_site(), "can only be applied to structs"));
+            return ctx
+                .error_or_skip(Error::new(Span::call_site(), "can only be applied to structs"));
         }
     };
 
     if repr.get_packed().is_some() {
-        return Err(Error::new(Span::call_site(), "must not have #[repr(packed)] attribute"));
+        return ctx.error_or_skip(Error::new(
+            Span::call_site(),
+            "must not have #[repr(packed)] attribute",
+        ));
     }
 
     if !(repr.is_c() || repr.is_transparent()) {
-        return Err(Error::new(
+        return ctx.error_or_skip(Error::new(
             Span::call_site(),
             "must have #[repr(C)] or #[repr(transparent)] in order to guarantee this type's layout is splitable",
         ));

@@ -116,7 +120,7 @@ pub(crate) fn derive_split_at(ctx: &Ctx, _top_level: Trait) -> Result<TokenStrea
     let trailing_field = if let Some(((_, _, trailing_field), _)) = fields.split_last() {
         trailing_field
     } else {
-        return Err(Error::new(Span::call_site(), "must at least one field"));
+        return ctx.error_or_skip(Error::new(Span::call_site(), "must at least one field"));
     };
 
     let zerocopy_crate = &ctx.zerocopy_crate;

index a3e4a75631a5..44f083328786 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 use proc_macro2::TokenStream;
 use quote::quote;
 use syn::{

@@ -531,8 +531,8 @@ fn project(slf: #zerocopy_crate::pointer::PtrInner<'_, Self>) -> *mut <Self as #
                 data,
                 Trait::ProjectField {
                     variant_id: variant_id.clone(),
-                    field: field.clone(),
-                    field_id: field_id.clone(),
+                    field,
+                    field_id,
                     invariants: parse_quote!((Aliasing, Alignment, #zerocopy_crate::invariant::Initialized)),
                 },
                 FieldBounds::None,

index d6dea0a11f1e..7c97d62e2dcb 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 use proc_macro2::{Span, TokenStream};
 use syn::{Data, DataEnum, DataStruct, DataUnion, Error};
 

index c517ea7db1eb..88599e750894 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

@@ -129,6 +129,40 @@ fn into_ts(self) -> proc_macro2::TokenStream {
 derive!(ByteEq => derive_eq => crate::derive::derive_eq);
 derive!(SplitAt => derive_split_at => crate::derive::derive_split_at);
 
+#[cfg_attr(zerocopy_unstable_linux, doc(hidden))]
+#[proc_macro_derive(most_traits, attributes(zerocopy))]
+pub fn most_traits(ts: proc_macro::TokenStream) -> proc_macro::TokenStream {
+    let ast = syn::parse_macro_input!(ts as DeriveInput);
+    let ctx = match Ctx::try_from_derive_input(ast) {
+        Ok(ctx) => ctx,
+        Err(e) => return e.into_compile_error().into(),
+    }
+    .skip_on_error();
+
+    // top-level traits for which to attempt a derive
+    let derives: [(fn(&Ctx, Trait) -> _, _); 6] = [
+        (crate::derive::known_layout::derive, Trait::KnownLayout),
+        (crate::derive::derive_immutable, Trait::Immutable),
+        (crate::derive::from_bytes::derive_from_bytes, Trait::FromBytes),
+        (crate::derive::into_bytes::derive_into_bytes, Trait::IntoBytes),
+        (crate::derive::derive_split_at, Trait::SplitAt),
+        (crate::derive::unaligned::derive_unaligned, Trait::Unaligned),
+    ];
+
+    let mut tokens = proc_macro2::TokenStream::new();
+    for (derive, t) in derives {
+        tokens.extend(derive(&ctx, t))
+    }
+
+    // We wrap in `const_block` as a backstop in case any derive fails
+    // to wrap its output in `const_block` (and thus fails to annotate)
+    // with the full set of `#[allow(...)]` attributes).
+    let ts = const_block([Some(tokens)]);
+    #[cfg(test)]
+    crate::util::testutil::check_hygiene(ts.clone());
+    ts.into()
+}
+
 /// Deprecated: prefer [`FromZeros`] instead.
 #[deprecated(since = "0.8.0", note = "`FromZeroes` was renamed to `FromZeros`")]
 #[doc(hidden)]

index 74fd376d9fda..1525e94302d1 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index 5ba5228e2a44..5c5e9d3bdcb8 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2019 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

@@ -98,6 +98,11 @@ pub(crate) fn with_input(&self, input: &DeriveInput) -> Self {
         }
     }
 
+    pub(crate) fn skip_on_error(mut self) -> Self {
+        self.skip_on_error = true;
+        self
+    }
+
     pub(crate) fn core_path(&self) -> TokenStream {
         let zerocopy_crate = &self.zerocopy_crate;
         quote!(#zerocopy_crate::util::macro_util::core_reexport)

@@ -106,20 +111,21 @@ pub(crate) fn core_path(&self) -> TokenStream {
     pub(crate) fn cfg_compile_error(&self) -> TokenStream {
         // By checking both during the compilation of the proc macro *and* in
         // the generated code, we ensure that `--cfg
-        // zerocopy_unstable_derive_on_error` need only be passed *either* when
+        // zerocopy_unstable_linux` need only be passed *either* when
         // compiling this crate *or* when compiling the user's crate. The former
         // is preferable, but in some situations (such as when cross-compiling
         // using `cargo build --target`), it doesn't get propagated to this
         // crate's build by default.
-        if cfg!(zerocopy_unstable_derive_on_error) {
+        if cfg!(zerocopy_unstable_linux) {
             quote!()
         } else if let Some(span) = self.on_error_span {
             let core = self.core_path();
-            let error_message = "`on_error` is experimental; pass '--cfg zerocopy_unstable_derive_on_error' to enable";
+            let error_message =
+                "`on_error` is experimental; pass '--cfg zerocopy_unstable_linux' to enable";
             quote::quote_spanned! {span=>
                 #[allow(unused_attributes, unexpected_cfgs)]
                 const _: () = {
-                    #[cfg(not(zerocopy_unstable_derive_on_error))]
+                    #[cfg(not(zerocopy_unstable_linux))]
                     #core::compile_error!(#error_message);
                 };
             }

@@ -612,6 +618,20 @@ fn bound_tt(ty: &Type, traits: impl Iterator<Item = Trait>, ctx: &Ctx) -> WhereP
             }
         };
 
+        let zerocopy_bounds =
+            field_type_bounds
+                .into_iter()
+                .chain(padding_check_bound)
+                .chain(self_bounds)
+                .map(|bound| {
+                    if self.ctx.skip_on_error {
+                        parse_quote!(for<'zc> #bound)
+                    } else {
+                        bound.clone()
+                    }
+                })
+                .collect::<Vec<_>>();
+
         let bounds = self
             .ctx
             .ast

@@ -621,9 +641,7 @@ fn bound_tt(ty: &Type, traits: impl Iterator<Item = Trait>, ctx: &Ctx) -> WhereP
             .map(|where_clause| where_clause.predicates.iter())
             .into_iter()
             .flatten()
-            .chain(field_type_bounds.iter())
-            .chain(padding_check_bound.iter())
-            .chain(self_bounds.iter());
+            .chain(zerocopy_bounds.iter());
 
         // The parameters with trait bounds, but without type defaults.
         let mut params: Vec<_> = self

index a5ded4a18b39..b7f85098dbc4 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

73 lines not on this page · raw message

index 24bafbf9adeb..59ddd35c77c6 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

index 7cb08c31d452..5eb30de934f3 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

index 22fd6c3d5d94..62e234c5202b 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

@@ -1359,7 +1359,7 @@ mod $mod {
         #[cfg(not(no_zerocopy_aarch64_simd_1_59_0))]
         simd_arch_mod!(
             #[cfg(all(
-                target_arch = "aarch64", 
+                target_arch = "aarch64",
                 any(
                     target_endian = "little",
                     not(no_zerocopy_aarch64_simd_be_1_87_0)

index 6015d0f2de52..942d35db8957 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

index 3302d67602ab..700fece1b728 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2018 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

@@ -12,7 +12,7 @@
 // After updating the following doc comment, make sure to run the following
 // command to update `README.md` based on its contents:
 //
-//   cargo -q run --manifest-path tools/Cargo.toml -p generate-readme > README.md
+//   (cd .. && cargo -q run --manifest-path tools/Cargo.toml -p generate-readme) > README.md
 
 //! ***<span style="font-size: 140%">Fast, safe, <span
 //! style="color:red;">compile error</span>. Pick two.</span>***

@@ -174,7 +174,7 @@
 //!
 //! [Miri]: https://github.com/rust-lang/miri
 //! [Kani]: https://github.com/model-checking/kani
-//! [soundness policy]: https://github.com/google/zerocopy/blob/main/POLICIES.md#soundness
+//! [soundness policy]: https://github.com/google/zerocopy/blob/main/zerocopy/POLICIES.md#soundness
 //!
 //! # Relationship to Project Safe Transmute
 //!

@@ -203,7 +203,7 @@
 //!
 //! See our [MSRV policy].
 //!
-//! [MSRV policy]: https://github.com/google/zerocopy/blob/main/POLICIES.md#msrv
+//! [MSRV policy]: https://github.com/google/zerocopy/blob/main/zerocopy/POLICIES.md#msrv
 //!
 //! # Changelog
 //!

@@ -435,6 +435,9 @@
     WARNING
 };
 
+#[doc(hidden)]
+#[cfg(all(any(feature = "derive", test), zerocopy_unstable_linux))]
+pub use zerocopy_derive::most_traits;
 /// Implements [`KnownLayout`].
 ///
 /// This derive analyzes various aspects of a type's layout that are needed for

@@ -2832,7 +2835,7 @@ fn try_ref_from_suffix_with_elems(
     /// ```
     ///
     /// [`try_mut_from_bytes`]: TryFromBytes::try_mut_from_bytes
-    ///  
+    ///
     #[doc = codegen_header!("h5", "try_mut_from_bytes_with_elems")]
     ///
     /// See [`TryFromBytes::try_ref_from_bytes_with_elems`](#method.try_ref_from_bytes_with_elems.codegen).

index b801d86a8fa6..ec67c03a44fc 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

index 5db08080141f..949b60a3f83e 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index 1802d23563db..7ff0d43dad5e 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index 3461f7f5ca80..d6eacc52febe 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index b7c4ea56d2b2..7213f6f4a04e 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index a534984b70d3..ef9836698203 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2025 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index 860066d75196..e49f2a887ffa 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2024 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

index 9a67d5acbb0d..d7778425a31d 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2025 The Fuchsia Authors
 //
 // Licensed under the 2-Clause BSD License <LICENSE-BSD or

index 1abb0fbeb46e..ceeb80432b0b 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2022 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index 43e4fd64ee15..7e63e3a54fc4 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index d6d4c6c2fcd9..f8affbbd336c 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0

index 266aec25fa58..1a8cf2b41d55 100644
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: (BSD-2-Clause OR Apache-2.0) OR MIT
-
+//
 // Copyright 2023 The Fuchsia Authors
 //
 // Licensed under a BSD-style license <LICENSE-BSD>, Apache License, Version 2.0