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Rollup merge of #124741 - nebulark:patchable-function-entries-pr, r=estebank,workingjubilee

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patchable-function-entry: Add unstable compiler flag and attribute

Tracking issue: #123115

Add the -Z patchable-function-entry compiler flag and the #[patchable_function_entry(prefix_nops = m, entry_nops = n)] attribute.
Rebased and adjusted the canditate implementation to match changes in the RFC.
This commit is contained in:
Matthias Krüger 2024-06-28 08:34:07 +02:00 • committed by GitHub
commit 02629325f6
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19 changed files with 478 additions and 7 deletions
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7
compiler/rustc_feature/src/builtin_attrs.rs
View file

@ -585,6 +585,13 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
EncodeCrossCrate::No, derive_smart_pointer, experimental!(pointee)
),
// RFC 3543
// `#[patchable_function_entry(prefix_nops = m, entry_nops = n)]`
gated!(
patchable_function_entry, Normal, template!(List: "prefix_nops = m, entry_nops = n"), ErrorPreceding,
EncodeCrossCrate::Yes, experimental!(patchable_function_entry)
),
// ==========================================================================
// Internal attributes: Stability, deprecation, and unsafe:
// ==========================================================================

2
compiler/rustc_feature/src/unstable.rs
View file

@ -563,6 +563,8 @@ declare_features! (
(unstable, offset_of_slice, "CURRENT_RUSTC_VERSION", Some(126151)),
/// Allows using `#[optimize(X)]`.
(unstable, optimize_attribute, "1.34.0", Some(54882)),
/// Allows specifying nop padding on functions for dynamic patching.
(unstable, patchable_function_entry, "CURRENT_RUSTC_VERSION", Some(123115)),
/// Allows postfix match `expr.match { ... }`
(unstable, postfix_match, "1.79.0", Some(121618)),
/// Allows `use<'a, 'b, A, B>` in `impl Trait + use<...>` for precise capture of generic args.