From c324d6e1414f7f08b37a3377524b74cc8d56fa2c Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Fri, 3 Apr 2026 22:57:29 +0200 Subject: [PATCH 1/9] Simplify attribute validation --- .../rustc_attr_parsing/src/validate_attr.rs | 45 +++++-------------- 1 file changed, 12 insertions(+), 33 deletions(-) diff --git a/compiler/rustc_attr_parsing/src/validate_attr.rs b/compiler/rustc_attr_parsing/src/validate_attr.rs index f56e85b110610..ed1d1a81f7a54 100644 --- a/compiler/rustc_attr_parsing/src/validate_attr.rs +++ b/compiler/rustc_attr_parsing/src/validate_attr.rs @@ -1,7 +1,6 @@ //! Meta-syntax validation logic of attributes for post-expansion. use std::convert::identity; -use std::slice; use rustc_ast::token::Delimiter; use rustc_ast::tokenstream::DelimSpan; @@ -9,7 +8,7 @@ use rustc_ast::{ self as ast, AttrArgs, Attribute, DelimArgs, MetaItem, MetaItemInner, MetaItemKind, Safety, }; use rustc_errors::{Applicability, FatalError, PResult}; -use rustc_feature::{AttributeTemplate, BUILTIN_ATTRIBUTE_MAP, BuiltinAttribute}; +use rustc_feature::{AttributeTemplate, BUILTIN_ATTRIBUTE_MAP}; use rustc_hir::AttrPath; use rustc_hir::lints::AttributeLintKind; use rustc_parse::parse_in; @@ -19,43 +18,23 @@ use rustc_session::lint::builtin::ILL_FORMED_ATTRIBUTE_INPUT; use rustc_session::parse::ParseSess; use rustc_span::{Span, Symbol, sym}; -use crate::{AttributeParser, Late, session_diagnostics as errors}; +use crate::session_diagnostics as errors; pub fn check_attr(psess: &ParseSess, attr: &Attribute) { - if attr.is_doc_comment() || attr.has_name(sym::cfg_trace) || attr.has_name(sym::cfg_attr_trace) + // Built-in attributes are parsed in their respective attribute parsers, so can be ignored here + if attr.is_doc_comment() + || attr.name().is_some_and(|name| BUILTIN_ATTRIBUTE_MAP.contains_key(&name)) { return; } - let builtin_attr_info = attr.name().and_then(|name| BUILTIN_ATTRIBUTE_MAP.get(&name)); - - // Check input tokens for built-in and key-value attributes. - match builtin_attr_info { - // `rustc_dummy` doesn't have any restrictions specific to built-in attributes. - Some(BuiltinAttribute { name, template, .. }) => { - if AttributeParser::::is_parsed_attribute(slice::from_ref(&name)) { - return; - } - match parse_meta(psess, attr) { - // Don't check safety again, we just did that - Ok(meta) => { - check_builtin_meta_item(psess, &meta, attr.style, *name, *template, false) - } - Err(err) => { - err.emit(); - } - } - } - _ => { - let attr_item = attr.get_normal_item(); - if let AttrArgs::Eq { .. } = attr_item.args.unparsed_ref().unwrap() { - // All key-value attributes are restricted to meta-item syntax. - match parse_meta(psess, attr) { - Ok(_) => {} - Err(err) => { - err.emit(); - } - } + let attr_item = attr.get_normal_item(); + if let AttrArgs::Eq { .. } = attr_item.args.unparsed_ref().unwrap() { + // All key-value attributes are restricted to meta-item syntax. + match parse_meta(psess, attr) { + Ok(_) => {} + Err(err) => { + err.emit(); } } } From abb15f5a636496a0f74be42ef1990ddaebc960a7 Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Sat, 4 Apr 2026 13:15:57 +0200 Subject: [PATCH 2/9] Remove `emit_fatal_malformed_builtin_attribute` --- compiler/rustc_attr_parsing/src/validate_attr.rs | 16 ++-------------- compiler/rustc_expand/src/module.rs | 11 ++++++++--- 2 files changed, 10 insertions(+), 17 deletions(-) diff --git a/compiler/rustc_attr_parsing/src/validate_attr.rs b/compiler/rustc_attr_parsing/src/validate_attr.rs index ed1d1a81f7a54..f5c241a1f0e9a 100644 --- a/compiler/rustc_attr_parsing/src/validate_attr.rs +++ b/compiler/rustc_attr_parsing/src/validate_attr.rs @@ -7,7 +7,7 @@ use rustc_ast::tokenstream::DelimSpan; use rustc_ast::{ self as ast, AttrArgs, Attribute, DelimArgs, MetaItem, MetaItemInner, MetaItemKind, Safety, }; -use rustc_errors::{Applicability, FatalError, PResult}; +use rustc_errors::{Applicability, PResult}; use rustc_feature::{AttributeTemplate, BUILTIN_ATTRIBUTE_MAP}; use rustc_hir::AttrPath; use rustc_hir::lints::AttributeLintKind; @@ -149,7 +149,7 @@ pub fn check_builtin_meta_item( } } -fn emit_malformed_attribute( +pub fn emit_malformed_attribute( psess: &ParseSess, style: ast::AttrStyle, span: Span, @@ -210,15 +210,3 @@ fn emit_malformed_attribute( err.emit(); } } - -pub fn emit_fatal_malformed_builtin_attribute( - psess: &ParseSess, - attr: &Attribute, - name: Symbol, -) -> ! { - let template = BUILTIN_ATTRIBUTE_MAP.get(&name).expect("builtin attr defined").template; - emit_malformed_attribute(psess, attr.style, attr.span, name, template); - // This is fatal, otherwise it will likely cause a cascade of other errors - // (and an error here is expected to be very rare). - FatalError.raise() -} diff --git a/compiler/rustc_expand/src/module.rs b/compiler/rustc_expand/src/module.rs index 79ab3cab22ce2..0c2595a6de5ff 100644 --- a/compiler/rustc_expand/src/module.rs +++ b/compiler/rustc_expand/src/module.rs @@ -2,7 +2,6 @@ use std::iter::once; use std::path::{self, Path, PathBuf}; use rustc_ast::{AttrVec, Attribute, Inline, Item, ModSpans}; -use rustc_attr_parsing::validate_attr; use rustc_errors::{Diag, ErrorGuaranteed}; use rustc_parse::lexer::StripTokens; use rustc_parse::{exp, new_parser_from_file, unwrap_or_emit_fatal}; @@ -10,7 +9,9 @@ use rustc_session::Session; use rustc_session::parse::ParseSess; use rustc_span::{Ident, Span, sym}; use thin_vec::ThinVec; - +use rustc_attr_parsing::validate_attr::emit_malformed_attribute; +use rustc_feature::template; +use rustc_span::fatal_error::FatalError; use crate::base::ModuleData; use crate::errors::{ ModuleCircular, ModuleFileNotFound, ModuleInBlock, ModuleInBlockName, ModuleMultipleCandidates, @@ -195,7 +196,11 @@ pub(crate) fn mod_file_path_from_attr( // Usually bad forms are checked during semantic analysis via // `TyCtxt::check_mod_attrs`), but by the time that runs the macro // is expanded, and it doesn't give an error. - validate_attr::emit_fatal_malformed_builtin_attribute(&sess.psess, first_path, sym::path); + emit_malformed_attribute(&sess.psess, first_path.style, first_path.span, sym::path, template!( + NameValueStr: "file", + "https://doc.rust-lang.org/reference/items/modules.html#the-path-attribute" + )); + FatalError.raise() }; let path_str = path_sym.as_str(); From cb87c36bd97f1cc8ba9c90e84746ea912eab6ace Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Sat, 4 Apr 2026 13:24:24 +0200 Subject: [PATCH 3/9] Remove template from BUILTIN_ATTRIBUTES --- compiler/rustc_expand/src/module.rs | 21 +- compiler/rustc_feature/src/builtin_attrs.rs | 458 ++++++-------------- 2 files changed, 157 insertions(+), 322 deletions(-) diff --git a/compiler/rustc_expand/src/module.rs b/compiler/rustc_expand/src/module.rs index 0c2595a6de5ff..6f0ecfb1cf1c1 100644 --- a/compiler/rustc_expand/src/module.rs +++ b/compiler/rustc_expand/src/module.rs @@ -2,16 +2,17 @@ use std::iter::once; use std::path::{self, Path, PathBuf}; use rustc_ast::{AttrVec, Attribute, Inline, Item, ModSpans}; +use rustc_attr_parsing::validate_attr::emit_malformed_attribute; use rustc_errors::{Diag, ErrorGuaranteed}; +use rustc_feature::template; use rustc_parse::lexer::StripTokens; use rustc_parse::{exp, new_parser_from_file, unwrap_or_emit_fatal}; use rustc_session::Session; use rustc_session::parse::ParseSess; +use rustc_span::fatal_error::FatalError; use rustc_span::{Ident, Span, sym}; use thin_vec::ThinVec; -use rustc_attr_parsing::validate_attr::emit_malformed_attribute; -use rustc_feature::template; -use rustc_span::fatal_error::FatalError; + use crate::base::ModuleData; use crate::errors::{ ModuleCircular, ModuleFileNotFound, ModuleInBlock, ModuleInBlockName, ModuleMultipleCandidates, @@ -196,10 +197,16 @@ pub(crate) fn mod_file_path_from_attr( // Usually bad forms are checked during semantic analysis via // `TyCtxt::check_mod_attrs`), but by the time that runs the macro // is expanded, and it doesn't give an error. - emit_malformed_attribute(&sess.psess, first_path.style, first_path.span, sym::path, template!( - NameValueStr: "file", - "https://doc.rust-lang.org/reference/items/modules.html#the-path-attribute" - )); + emit_malformed_attribute( + &sess.psess, + first_path.style, + first_path.span, + sym::path, + template!( + NameValueStr: "file", + "https://doc.rust-lang.org/reference/items/modules.html#the-path-attribute" + ), + ); FatalError.raise() }; diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs index acbcba90fbcc0..675a817890cbb 100644 --- a/compiler/rustc_feature/src/builtin_attrs.rs +++ b/compiler/rustc_feature/src/builtin_attrs.rs @@ -78,7 +78,6 @@ pub enum AttributeType { /// Normal, builtin attribute that is consumed /// by the compiler before the unused_attribute check Normal, - /// Builtin attribute that is only allowed at the crate level CrateLevel, } @@ -87,7 +86,6 @@ pub enum AttributeType { pub enum AttributeSafety { /// Normal attribute that does not need `#[unsafe(...)]` Normal, - /// Unsafe attribute that requires safety obligations to be discharged. /// /// An error is emitted when `#[unsafe(...)]` is omitted, except when the attribute's edition @@ -268,35 +266,32 @@ macro_rules! template { } macro_rules! ungated { - (unsafe($edition:ident) $attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { + (unsafe($edition:ident) $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: Some(Edition::$edition) }, - template: $tpl, gate: Ungated, duplicates: $duplicates, } }; - (unsafe $attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, - template: $tpl, gate: Ungated, duplicates: $duplicates, } }; - ($attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, - template: $tpl, gate: Ungated, duplicates: $duplicates, } @@ -304,13 +299,12 @@ macro_rules! ungated { } macro_rules! gated { - (unsafe $attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr, $gate:ident, $message:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, - template: $tpl, duplicates: $duplicates, gate: Gated { feature: sym::$gate, @@ -320,13 +314,12 @@ macro_rules! gated { }, } }; - (unsafe $attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr, $message:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, - template: $tpl, duplicates: $duplicates, gate: Gated { feature: sym::$attr, @@ -336,13 +329,12 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr, $gate:ident, $message:expr $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, - template: $tpl, duplicates: $duplicates, gate: Gated { feature: sym::$gate, @@ -352,13 +344,12 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr, $message:expr $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, - template: $tpl, duplicates: $duplicates, gate: Gated { feature: sym::$attr, @@ -371,11 +362,10 @@ macro_rules! gated { } macro_rules! rustc_attr { - (TEST, $attr:ident, $typ:expr, $tpl:expr, $duplicate:expr, $encode_cross_crate:expr $(,)?) => { + (TEST, $attr:ident, $typ:expr, $duplicate:expr, $encode_cross_crate:expr $(,)?) => { rustc_attr!( $attr, $typ, - $tpl, $duplicate, $encode_cross_crate, concat!( @@ -385,13 +375,12 @@ macro_rules! rustc_attr { ), ) }; - ($attr:ident, $typ:expr, $tpl:expr, $duplicates:expr, $encode_cross_crate:expr, $($notes:expr),* $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $($notes:expr),* $(,)?) => { BuiltinAttribute { name: sym::$attr, encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, - template: $tpl, duplicates: $duplicates, gate: Gated { feature: sym::rustc_attrs, @@ -423,7 +412,6 @@ pub struct BuiltinAttribute { pub encode_cross_crate: EncodeCrossCrate, pub type_: AttributeType, pub safety: AttributeSafety, - pub template: AttributeTemplate, pub duplicates: AttributeDuplicates, pub gate: AttributeGate, } @@ -438,240 +426,141 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Conditional compilation: ungated!( cfg, Normal, - template!( - List: &["predicate"], - "https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg-attribute" - ), DuplicatesOk, EncodeCrossCrate::No ), ungated!( cfg_attr, Normal, - template!( - List: &["predicate, attr1, attr2, ..."], - "https://doc.rust-lang.org/reference/conditional-compilation.html#the-cfg_attr-attribute" - ), DuplicatesOk, EncodeCrossCrate::No ), // Testing: ungated!( ignore, Normal, - template!( - Word, - NameValueStr: "reason", - "https://doc.rust-lang.org/reference/attributes/testing.html#the-ignore-attribute" - ), WarnFollowing, EncodeCrossCrate::No, ), ungated!( should_panic, Normal, - template!( - Word, - List: &[r#"expected = "reason""#], - NameValueStr: "reason", - "https://doc.rust-lang.org/reference/attributes/testing.html#the-should_panic-attribute" - ), FutureWarnFollowing, EncodeCrossCrate::No, ), // Macros: ungated!( automatically_derived, Normal, - template!( - Word, - "https://doc.rust-lang.org/reference/attributes/derive.html#the-automatically_derived-attribute" - ), WarnFollowing, EncodeCrossCrate::Yes ), ungated!( macro_use, Normal, - template!( - Word, - List: &["name1, name2, ..."], - "https://doc.rust-lang.org/reference/macros-by-example.html#the-macro_use-attribute" - ), WarnFollowingWordOnly, EncodeCrossCrate::No, ), - ungated!(macro_escape, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No), // Deprecated synonym for `macro_use`. + ungated!(macro_escape, Normal, WarnFollowing, EncodeCrossCrate::No), // Deprecated synonym for `macro_use`. ungated!( macro_export, Normal, - template!( - Word, - List: &["local_inner_macros"], - "https://doc.rust-lang.org/reference/macros-by-example.html#path-based-scope" - ), WarnFollowing, EncodeCrossCrate::Yes ), ungated!( proc_macro, Normal, - template!( - Word, - "https://doc.rust-lang.org/reference/procedural-macros.html#function-like-procedural-macros"), ErrorFollowing, EncodeCrossCrate::No ), ungated!( proc_macro_derive, Normal, - template!( - List: &["TraitName", "TraitName, attributes(name1, name2, ...)"], - "https://doc.rust-lang.org/reference/procedural-macros.html#derive-macros" - ), ErrorFollowing, EncodeCrossCrate::No, ), ungated!( proc_macro_attribute, Normal, - template!(Word, "https://doc.rust-lang.org/reference/procedural-macros.html#attribute-macros"), ErrorFollowing, EncodeCrossCrate::No ), // Lints: ungated!( warn, Normal, - template!( - List: &["lint1", "lint1, lint2, ...", r#"lint1, lint2, lint3, reason = "...""#], - "https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes" - ), DuplicatesOk, EncodeCrossCrate::No, ), ungated!( allow, Normal, - template!( - List: &["lint1", "lint1, lint2, ...", r#"lint1, lint2, lint3, reason = "...""#], - "https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes" - ), DuplicatesOk, EncodeCrossCrate::No, ), ungated!( expect, Normal, - template!( - List: &["lint1", "lint1, lint2, ...", r#"lint1, lint2, lint3, reason = "...""#], - "https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes" - ), DuplicatesOk, EncodeCrossCrate::No, ), ungated!( forbid, Normal, - template!( - List: &["lint1", "lint1, lint2, ...", r#"lint1, lint2, lint3, reason = "...""#], - "https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes" - ), DuplicatesOk, EncodeCrossCrate::No ), ungated!( deny, Normal, - template!( - List: &["lint1", "lint1, lint2, ...", r#"lint1, lint2, lint3, reason = "...""#], - "https://doc.rust-lang.org/reference/attributes/diagnostics.html#lint-check-attributes" - ), DuplicatesOk, EncodeCrossCrate::No ), ungated!( must_use, Normal, - template!( - Word, - NameValueStr: "reason", - "https://doc.rust-lang.org/reference/attributes/diagnostics.html#the-must_use-attribute" - ), FutureWarnFollowing, EncodeCrossCrate::Yes ), gated!( - must_not_suspend, Normal, template!(Word, NameValueStr: "reason"), WarnFollowing, + must_not_suspend, Normal, WarnFollowing, EncodeCrossCrate::Yes, experimental!(must_not_suspend) ), ungated!( deprecated, Normal, - template!( - Word, - List: &[r#"/*opt*/ since = "version", /*opt*/ note = "reason""#], - NameValueStr: "reason", - "https://doc.rust-lang.org/reference/attributes/diagnostics.html#the-deprecated-attribute" - ), ErrorFollowing, EncodeCrossCrate::Yes ), // Crate properties: ungated!( crate_name, CrateLevel, - template!( - NameValueStr: "name", - "https://doc.rust-lang.org/reference/crates-and-source-files.html#the-crate_name-attribute" - ), FutureWarnFollowing, EncodeCrossCrate::No, ), ungated!( crate_type, CrateLevel, - template!( - NameValueStr: ["bin", "lib", "dylib", "cdylib", "rlib", "staticlib", "sdylib", "proc-macro"], - "https://doc.rust-lang.org/reference/linkage.html" - ), DuplicatesOk, EncodeCrossCrate::No, ), // ABI, linking, symbols, and FFI ungated!( link, Normal, - template!(List: &[ - r#"name = "...""#, - r#"name = "...", kind = "dylib|static|...""#, - r#"name = "...", wasm_import_module = "...""#, - r#"name = "...", import_name_type = "decorated|noprefix|undecorated""#, - r#"name = "...", kind = "dylib|static|...", wasm_import_module = "...", import_name_type = "decorated|noprefix|undecorated""#, - ], "https://doc.rust-lang.org/reference/items/external-blocks.html#the-link-attribute"), DuplicatesOk, EncodeCrossCrate::No, ), ungated!( link_name, Normal, - template!(NameValueStr: "name", "https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_name-attribute"), FutureWarnPreceding, EncodeCrossCrate::Yes ), ungated!( no_link, Normal, - template!(Word, "https://doc.rust-lang.org/reference/items/extern-crates.html#the-no_link-attribute"), WarnFollowing, EncodeCrossCrate::No ), ungated!( repr, Normal, - template!( - List: &["C", "Rust", "transparent", "align(...)", "packed(...)", ""], - "https://doc.rust-lang.org/reference/type-layout.html#representations" - ), DuplicatesOk, EncodeCrossCrate::No ), // FIXME(#82232, #143834): temporarily renamed to mitigate `#[align]` nameres ambiguity - gated!(rustc_align, Normal, template!(List: &["alignment"]), DuplicatesOk, EncodeCrossCrate::No, fn_align, experimental!(rustc_align)), - gated!(rustc_align_static, Normal, template!(List: &["alignment"]), DuplicatesOk, EncodeCrossCrate::No, static_align, experimental!(rustc_align_static)), + gated!(rustc_align, Normal, DuplicatesOk, EncodeCrossCrate::No, fn_align, experimental!(rustc_align)), + gated!(rustc_align_static, Normal, DuplicatesOk, EncodeCrossCrate::No, static_align, experimental!(rustc_align_static)), ungated!( unsafe(Edition2024) export_name, Normal, - template!(NameValueStr: "name", "https://doc.rust-lang.org/reference/abi.html#the-export_name-attribute"), FutureWarnPreceding, EncodeCrossCrate::No ), ungated!( unsafe(Edition2024) link_section, Normal, - template!(NameValueStr: "name", "https://doc.rust-lang.org/reference/abi.html#the-link_section-attribute"), FutureWarnPreceding, EncodeCrossCrate::No ), ungated!( unsafe(Edition2024) no_mangle, Normal, - template!(Word, "https://doc.rust-lang.org/reference/abi.html#the-no_mangle-attribute"), WarnFollowing, EncodeCrossCrate::No ), ungated!( used, Normal, - template!(Word, List: &["compiler", "linker"], "https://doc.rust-lang.org/reference/abi.html#the-used-attribute"), WarnFollowing, EncodeCrossCrate::No ), ungated!( link_ordinal, Normal, - template!(List: &["ordinal"], "https://doc.rust-lang.org/reference/items/external-blocks.html#the-link_ordinal-attribute"), ErrorPreceding, EncodeCrossCrate::Yes ), ungated!( unsafe naked, Normal, - template!(Word, "https://doc.rust-lang.org/reference/attributes/codegen.html#the-naked-attribute"), WarnFollowing, EncodeCrossCrate::No ), // See `TyAndLayout::pass_indirectly_in_non_rustic_abis` for details. rustc_attr!( - rustc_pass_indirectly_in_non_rustic_abis, Normal, template!(Word), ErrorFollowing, + rustc_pass_indirectly_in_non_rustic_abis, Normal, ErrorFollowing, EncodeCrossCrate::No, "types marked with `#[rustc_pass_indirectly_in_non_rustic_abis]` are always passed indirectly by non-Rustic ABIs" ), @@ -679,134 +568,102 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Limits: ungated!( recursion_limit, CrateLevel, - template!(NameValueStr: "N", "https://doc.rust-lang.org/reference/attributes/limits.html#the-recursion_limit-attribute"), FutureWarnFollowing, EncodeCrossCrate::No ), ungated!( type_length_limit, CrateLevel, - template!(NameValueStr: "N", "https://doc.rust-lang.org/reference/attributes/limits.html#the-type_length_limit-attribute"), FutureWarnFollowing, EncodeCrossCrate::No ), gated!( - move_size_limit, CrateLevel, template!(NameValueStr: "N"), ErrorFollowing, + move_size_limit, CrateLevel, ErrorFollowing, EncodeCrossCrate::No, large_assignments, experimental!(move_size_limit) ), // Entry point: ungated!( no_main, CrateLevel, - template!(Word, "https://doc.rust-lang.org/reference/crates-and-source-files.html#the-no_main-attribute"), WarnFollowing, EncodeCrossCrate::No ), // Modules, prelude, and resolution: ungated!( path, Normal, - template!(NameValueStr: "file", "https://doc.rust-lang.org/reference/items/modules.html#the-path-attribute"), FutureWarnFollowing, EncodeCrossCrate::No ), ungated!( no_std, CrateLevel, - template!(Word, "https://doc.rust-lang.org/reference/names/preludes.html#the-no_std-attribute"), WarnFollowing, EncodeCrossCrate::No ), ungated!( no_implicit_prelude, Normal, - template!(Word, "https://doc.rust-lang.org/reference/names/preludes.html#the-no_implicit_prelude-attribute"), WarnFollowing, EncodeCrossCrate::No ), ungated!( non_exhaustive, Normal, - template!(Word, "https://doc.rust-lang.org/reference/attributes/type_system.html#the-non_exhaustive-attribute"), WarnFollowing, EncodeCrossCrate::Yes ), // Runtime ungated!( windows_subsystem, CrateLevel, - template!(NameValueStr: ["windows", "console"], "https://doc.rust-lang.org/reference/runtime.html#the-windows_subsystem-attribute"), FutureWarnFollowing, EncodeCrossCrate::No ), ungated!( // RFC 2070 panic_handler, Normal, - template!(Word, "https://doc.rust-lang.org/reference/panic.html#the-panic_handler-attribute"), WarnFollowing, EncodeCrossCrate::Yes ), // Code generation: ungated!( inline, Normal, - template!( - Word, - List: &["always", "never"], - "https://doc.rust-lang.org/reference/attributes/codegen.html#the-inline-attribute" - ), FutureWarnFollowing, EncodeCrossCrate::No ), ungated!( cold, Normal, - template!(Word, "https://doc.rust-lang.org/reference/attributes/codegen.html#the-cold-attribute"), WarnFollowing, EncodeCrossCrate::No ), ungated!( no_builtins, CrateLevel, - template!(Word, "https://doc.rust-lang.org/reference/attributes/codegen.html#the-no_builtins-attribute"), WarnFollowing, EncodeCrossCrate::Yes ), ungated!( target_feature, Normal, - template!(List: &[r#"enable = "name""#], "https://doc.rust-lang.org/reference/attributes/codegen.html#the-target_feature-attribute"), DuplicatesOk, EncodeCrossCrate::No, ), ungated!( track_caller, Normal, - template!(Word, "https://doc.rust-lang.org/reference/attributes/codegen.html#the-track_caller-attribute"), WarnFollowing, EncodeCrossCrate::Yes ), ungated!( instruction_set, Normal, - template!(List: &["set"], "https://doc.rust-lang.org/reference/attributes/codegen.html#the-instruction_set-attribute"), ErrorPreceding, EncodeCrossCrate::No ), gated!( - unsafe force_target_feature, Normal, template!(List: &[r#"enable = "name""#]), + unsafe force_target_feature, Normal, DuplicatesOk, EncodeCrossCrate::No, effective_target_features, experimental!(force_target_feature) ), gated!( - sanitize, Normal, template!(List: &[r#"address = "on|off""#, r#"kernel_address = "on|off""#, r#"cfi = "on|off""#, r#"hwaddress = "on|off""#, r#"kernel_hwaddress = "on|off""#, r#"kcfi = "on|off""#, r#"memory = "on|off""#, r#"memtag = "on|off""#, r#"shadow_call_stack = "on|off""#, r#"thread = "on|off""#]), ErrorPreceding, + sanitize, Normal, ErrorPreceding, EncodeCrossCrate::No, sanitize, experimental!(sanitize), ), gated!( - coverage, Normal, template!(OneOf: &[sym::off, sym::on]), + coverage, Normal, ErrorPreceding, EncodeCrossCrate::No, coverage_attribute, experimental!(coverage) ), ungated!( doc, Normal, - template!( - List: &["hidden", "inline"], - NameValueStr: "string", - "https://doc.rust-lang.org/rustdoc/write-documentation/the-doc-attribute.html" - ), DuplicatesOk, EncodeCrossCrate::Yes ), // Debugging ungated!( debugger_visualizer, Normal, - template!( - List: &[r#"natvis_file = "...", gdb_script_file = "...""#], - "https://doc.rust-lang.org/reference/attributes/debugger.html#the-debugger_visualizer-attribute" - ), DuplicatesOk, EncodeCrossCrate::No ), ungated!( collapse_debuginfo, Normal, - template!( - List: &["no", "external", "yes"], - "https://doc.rust-lang.org/reference/attributes/debugger.html#the-collapse_debuginfo-attribute" - ), ErrorFollowing, EncodeCrossCrate::Yes ), @@ -816,70 +673,70 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Linking: gated!( - export_stable, Normal, template!(Word), WarnFollowing, + export_stable, Normal, WarnFollowing, EncodeCrossCrate::No, experimental!(export_stable) ), // Testing: gated!( - test_runner, CrateLevel, template!(List: &["path"]), ErrorFollowing, + test_runner, CrateLevel, ErrorFollowing, EncodeCrossCrate::Yes, custom_test_frameworks, "custom test frameworks are an unstable feature", ), gated!( - reexport_test_harness_main, CrateLevel, template!(NameValueStr: "name"), ErrorFollowing, + reexport_test_harness_main, CrateLevel, ErrorFollowing, EncodeCrossCrate::No, custom_test_frameworks, "custom test frameworks are an unstable feature", ), // RFC #1268 gated!( - marker, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No, + marker, Normal, WarnFollowing, EncodeCrossCrate::No, marker_trait_attr, experimental!(marker) ), gated!( - thread_local, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No, + thread_local, Normal, WarnFollowing, EncodeCrossCrate::No, "`#[thread_local]` is an experimental feature, and does not currently handle destructors", ), gated!( - no_core, CrateLevel, template!(Word), WarnFollowing, + no_core, CrateLevel, WarnFollowing, EncodeCrossCrate::No, experimental!(no_core) ), // RFC 2412 gated!( - optimize, Normal, template!(List: &["none", "size", "speed"]), ErrorPreceding, + optimize, Normal, ErrorPreceding, EncodeCrossCrate::No, optimize_attribute, experimental!(optimize) ), gated!( - unsafe ffi_pure, Normal, template!(Word), WarnFollowing, + unsafe ffi_pure, Normal, WarnFollowing, EncodeCrossCrate::No, experimental!(ffi_pure) ), gated!( - unsafe ffi_const, Normal, template!(Word), WarnFollowing, + unsafe ffi_const, Normal, WarnFollowing, EncodeCrossCrate::No, experimental!(ffi_const) ), gated!( - register_tool, CrateLevel, template!(List: &["tool1, tool2, ..."]), DuplicatesOk, + register_tool, CrateLevel, DuplicatesOk, EncodeCrossCrate::No, experimental!(register_tool), ), // `#[cfi_encoding = ""]` gated!( - cfi_encoding, Normal, template!(NameValueStr: "encoding"), ErrorPreceding, + cfi_encoding, Normal, ErrorPreceding, EncodeCrossCrate::Yes, experimental!(cfi_encoding) ), // `#[coroutine]` attribute to be applied to closures to make them coroutines instead gated!( - coroutine, Normal, template!(Word), ErrorFollowing, + coroutine, Normal, ErrorFollowing, EncodeCrossCrate::No, coroutines, experimental!(coroutine) ), // 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, + patchable_function_entry, Normal, ErrorPreceding, EncodeCrossCrate::Yes, experimental!(patchable_function_entry) ), @@ -888,11 +745,11 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/132306 gated!( - const_continue, Normal, template!(Word), ErrorFollowing, + const_continue, Normal, ErrorFollowing, EncodeCrossCrate::No, loop_match, experimental!(const_continue) ), gated!( - loop_match, Normal, template!(Word), ErrorFollowing, + loop_match, Normal, ErrorFollowing, EncodeCrossCrate::No, loop_match, experimental!(loop_match) ), @@ -901,7 +758,7 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/130494 gated!( - pin_v2, Normal, template!(Word), ErrorFollowing, + pin_v2, Normal, ErrorFollowing, EncodeCrossCrate::Yes, pin_ergonomics, experimental!(pin_v2), ), @@ -911,62 +768,61 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ ungated!( feature, CrateLevel, - template!(List: &["name1, name2, ..."]), DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, EncodeCrossCrate::No, ), // DuplicatesOk since it has its own validation ungated!( stable, Normal, - template!(List: &[r#"feature = "name", since = "version""#]), DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, EncodeCrossCrate::No, ), ungated!( unstable, Normal, - template!(List: &[r#"feature = "name", reason = "...", issue = "N""#]), DuplicatesOk, + DuplicatesOk, EncodeCrossCrate::Yes ), ungated!( - unstable_feature_bound, Normal, template!(Word, List: &["feat1, feat2, ..."]), + unstable_feature_bound, Normal, DuplicatesOk, EncodeCrossCrate::No, ), ungated!( - rustc_const_unstable, Normal, template!(List: &[r#"feature = "name""#]), + rustc_const_unstable, Normal, DuplicatesOk, EncodeCrossCrate::Yes ), ungated!( rustc_const_stable, Normal, - template!(List: &[r#"feature = "name""#]), DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, EncodeCrossCrate::No, ), ungated!( rustc_default_body_unstable, Normal, - template!(List: &[r#"feature = "name", reason = "...", issue = "N""#]), DuplicatesOk, EncodeCrossCrate::No ), gated!( - allow_internal_unstable, Normal, template!(Word, List: &["feat1, feat2, ..."]), + allow_internal_unstable, Normal, DuplicatesOk, EncodeCrossCrate::Yes, "allow_internal_unstable side-steps feature gating and stability checks", ), gated!( - allow_internal_unsafe, Normal, template!(Word), WarnFollowing, + allow_internal_unsafe, Normal, WarnFollowing, EncodeCrossCrate::No, "allow_internal_unsafe side-steps the unsafe_code lint", ), gated!( - rustc_eii_foreign_item, Normal, template!(Word), + rustc_eii_foreign_item, Normal, ErrorFollowing, EncodeCrossCrate::Yes, eii_internals, "used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), rustc_attr!( - rustc_allowed_through_unstable_modules, Normal, template!(NameValueStr: "deprecation message"), + rustc_allowed_through_unstable_modules, Normal, WarnFollowing, EncodeCrossCrate::No, "rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \ through unstable paths" ), rustc_attr!( - rustc_deprecated_safe_2024, Normal, template!(List: &[r#"audit_that = "...""#]), + rustc_deprecated_safe_2024, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", ), rustc_attr!( - rustc_pub_transparent, Normal, template!(Word), + rustc_pub_transparent, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), @@ -976,9 +832,9 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes: Type system related: // ========================================================================== - gated!(fundamental, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::Yes, experimental!(fundamental)), + gated!(fundamental, Normal, WarnFollowing, EncodeCrossCrate::Yes, experimental!(fundamental)), gated!( - may_dangle, Normal, template!(Word), WarnFollowing, + may_dangle, Normal, WarnFollowing, EncodeCrossCrate::No, dropck_eyepatch, "`may_dangle` has unstable semantics and may be removed in the future", ), @@ -986,13 +842,6 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_never_type_options, Normal, - template!(List: &[ - "", - r#"fallback = "unit""#, - r#"fallback = "niko""#, - r#"fallback = "never""#, - r#"fallback = "no""#, - ]), ErrorFollowing, EncodeCrossCrate::No, "`rustc_never_type_options` is used to experiment with never type fallback and work on \ @@ -1004,53 +853,53 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== rustc_attr!( - rustc_allocator, Normal, template!(Word), WarnFollowing, + rustc_allocator, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( - rustc_nounwind, Normal, template!(Word), WarnFollowing, + rustc_nounwind, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( - rustc_reallocator, Normal, template!(Word), WarnFollowing, + rustc_reallocator, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( - rustc_deallocator, Normal, template!(Word), WarnFollowing, + rustc_deallocator, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( - rustc_allocator_zeroed, Normal, template!(Word), WarnFollowing, + rustc_allocator_zeroed, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( - rustc_allocator_zeroed_variant, Normal, template!(NameValueStr: "function"), ErrorPreceding, + rustc_allocator_zeroed_variant, Normal, ErrorPreceding, EncodeCrossCrate::Yes, ), gated!( - default_lib_allocator, Normal, template!(Word), WarnFollowing, + default_lib_allocator, Normal, WarnFollowing, EncodeCrossCrate::No, allocator_internals, experimental!(default_lib_allocator), ), gated!( - needs_allocator, Normal, template!(Word), WarnFollowing, + needs_allocator, Normal, WarnFollowing, EncodeCrossCrate::No, allocator_internals, experimental!(needs_allocator), ), gated!( - panic_runtime, CrateLevel, template!(Word), WarnFollowing, + panic_runtime, CrateLevel, WarnFollowing, EncodeCrossCrate::No, experimental!(panic_runtime) ), gated!( - needs_panic_runtime, CrateLevel, template!(Word), WarnFollowing, + needs_panic_runtime, CrateLevel, WarnFollowing, EncodeCrossCrate::No, experimental!(needs_panic_runtime) ), gated!( - compiler_builtins, CrateLevel, template!(Word), WarnFollowing, + compiler_builtins, CrateLevel, WarnFollowing, EncodeCrossCrate::No, "the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate \ which contains compiler-rt intrinsics and will never be stable", ), gated!( - profiler_runtime, CrateLevel, template!(Word), WarnFollowing, + profiler_runtime, CrateLevel, WarnFollowing, EncodeCrossCrate::No, "the `#[profiler_runtime]` attribute is used to identify the `profiler_builtins` crate \ which contains the profiler runtime and will never be stable", @@ -1061,30 +910,20 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== gated!( - linkage, Normal, template!(NameValueStr: [ - "available_externally", - "common", - "extern_weak", - "external", - "internal", - "linkonce", - "linkonce_odr", - "weak", - "weak_odr", - ], "https://doc.rust-lang.org/reference/linkage.html"), + linkage, Normal, ErrorPreceding, EncodeCrossCrate::No, "the `linkage` attribute is experimental and not portable across platforms", ), rustc_attr!( - rustc_std_internal_symbol, Normal, template!(Word), WarnFollowing, + rustc_std_internal_symbol, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( - rustc_objc_class, Normal, template!(NameValueStr: "ClassName"), ErrorPreceding, + rustc_objc_class, Normal, ErrorPreceding, EncodeCrossCrate::No, ), rustc_attr!( - rustc_objc_selector, Normal, template!(NameValueStr: "methodName"), ErrorPreceding, + rustc_objc_selector, Normal, ErrorPreceding, EncodeCrossCrate::No, ), @@ -1094,26 +933,26 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_builtin_macro, Normal, - template!(Word, List: &["name", "name, /*opt*/ attributes(name1, name2, ...)"]), ErrorFollowing, + ErrorFollowing, EncodeCrossCrate::Yes, ), rustc_attr!( - rustc_proc_macro_decls, Normal, template!(Word), WarnFollowing, + rustc_proc_macro_decls, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( rustc_macro_transparency, Normal, - template!(NameValueStr: ["transparent", "semiopaque", "opaque"]), ErrorFollowing, + ErrorFollowing, EncodeCrossCrate::Yes, "used internally for testing macro hygiene", ), rustc_attr!( rustc_autodiff, Normal, - template!(Word, List: &[r#""...""#]), DuplicatesOk, + DuplicatesOk, EncodeCrossCrate::Yes, ), rustc_attr!( rustc_offload_kernel, Normal, - template!(Word), DuplicatesOk, + DuplicatesOk, EncodeCrossCrate::Yes, ), // Traces that are left when `cfg` and `cfg_attr` attributes are expanded. @@ -1121,11 +960,11 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // or unstable code directly because `sym::cfg_(attr_)trace` are not valid identifiers, they // can only be generated by the compiler. ungated!( - cfg_trace, Normal, template!(Word /* irrelevant */), DuplicatesOk, + cfg_trace, Normal, DuplicatesOk, EncodeCrossCrate::Yes ), ungated!( - cfg_attr_trace, Normal, template!(Word /* irrelevant */), DuplicatesOk, + cfg_attr_trace, Normal, DuplicatesOk, EncodeCrossCrate::No ), @@ -1135,51 +974,46 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_on_unimplemented, Normal, - template!( - List: &[r#"/*opt*/ message = "...", /*opt*/ label = "...", /*opt*/ note = "...""#], - NameValueStr: "message" - ), ErrorFollowing, EncodeCrossCrate::Yes, "see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" ), rustc_attr!( rustc_confusables, Normal, - template!(List: &[r#""name1", "name2", ..."#]), ErrorFollowing, EncodeCrossCrate::Yes, ), // Enumerates "identity-like" conversion methods to suggest on type mismatch. rustc_attr!( - rustc_conversion_suggestion, Normal, template!(Word), + rustc_conversion_suggestion, Normal, WarnFollowing, EncodeCrossCrate::Yes, ), // Prevents field reads in the marked trait or method to be considered // during dead code analysis. rustc_attr!( - rustc_trivial_field_reads, Normal, template!(Word), + rustc_trivial_field_reads, Normal, WarnFollowing, EncodeCrossCrate::Yes, ), // Used by the `rustc::potential_query_instability` lint to warn methods which // might not be stable during incremental compilation. rustc_attr!( - rustc_lint_query_instability, Normal, template!(Word), + rustc_lint_query_instability, Normal, WarnFollowing, EncodeCrossCrate::Yes, ), // Used by the `rustc::untracked_query_information` lint to warn methods which // might not be stable during incremental compilation. rustc_attr!( - rustc_lint_untracked_query_information, Normal, template!(Word), + rustc_lint_untracked_query_information, Normal, WarnFollowing, EncodeCrossCrate::Yes, ), // Used by the `rustc::bad_opt_access` lint to identify `DebuggingOptions` and `CodegenOptions` // types (as well as any others in future). rustc_attr!( - rustc_lint_opt_ty, Normal, template!(Word), + rustc_lint_opt_ty, Normal, WarnFollowing, EncodeCrossCrate::Yes, ), // Used by the `rustc::bad_opt_access` lint on fields // types (as well as any others in future). rustc_attr!( - rustc_lint_opt_deny_field_access, Normal, template!(List: &["message"]), + rustc_lint_opt_deny_field_access, Normal, WarnFollowing, EncodeCrossCrate::Yes, ), @@ -1188,31 +1022,30 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== rustc_attr!( - rustc_promotable, Normal, template!(Word), WarnFollowing, + rustc_promotable, Normal, WarnFollowing, EncodeCrossCrate::No, ), rustc_attr!( - rustc_legacy_const_generics, Normal, template!(List: &["N"]), ErrorFollowing, + rustc_legacy_const_generics, Normal, ErrorFollowing, EncodeCrossCrate::Yes, ), // Do not const-check this function's body. It will always get replaced during CTFE via `hook_special_const_fn`. rustc_attr!( - rustc_do_not_const_check, Normal, template!(Word), WarnFollowing, + rustc_do_not_const_check, Normal, WarnFollowing, EncodeCrossCrate::Yes, "`#[rustc_do_not_const_check]` skips const-check for this function's body", ), rustc_attr!( rustc_const_stable_indirect, Normal, - template!(Word), WarnFollowing, EncodeCrossCrate::No, "this is an internal implementation detail", ), rustc_attr!( rustc_intrinsic_const_stable_indirect, Normal, - template!(Word), WarnFollowing, EncodeCrossCrate::No, "this is an internal implementation detail", + WarnFollowing, EncodeCrossCrate::No, "this is an internal implementation detail", ), rustc_attr!( rustc_allow_const_fn_unstable, Normal, - template!(Word, List: &["feat1, feat2, ..."]), DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, EncodeCrossCrate::No, "rustc_allow_const_fn_unstable side-steps feature gating and stability checks" ), @@ -1221,25 +1054,25 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== rustc_attr!( - rustc_layout_scalar_valid_range_start, Normal, template!(List: &["value"]), ErrorFollowing, + rustc_layout_scalar_valid_range_start, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \ niche optimizations in the standard library", ), rustc_attr!( - rustc_layout_scalar_valid_range_end, Normal, template!(List: &["value"]), ErrorFollowing, + rustc_layout_scalar_valid_range_end, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \ niche optimizations in the standard library", ), rustc_attr!( - rustc_simd_monomorphize_lane_limit, Normal, template!(NameValueStr: "N"), ErrorFollowing, + rustc_simd_monomorphize_lane_limit, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "the `#[rustc_simd_monomorphize_lane_limit]` attribute is just used by std::simd \ for better error messages", ), rustc_attr!( - rustc_nonnull_optimization_guaranteed, Normal, template!(Word), WarnFollowing, + rustc_nonnull_optimization_guaranteed, Normal, WarnFollowing, EncodeCrossCrate::Yes, "the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to document \ guaranteed niche optimizations in the standard library", @@ -1251,53 +1084,52 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes, Misc: // ========================================================================== gated!( - lang, Normal, template!(NameValueStr: "name"), DuplicatesOk, EncodeCrossCrate::No, lang_items, + lang, Normal, DuplicatesOk, EncodeCrossCrate::No, lang_items, "lang items are subject to change", ), rustc_attr!( - rustc_as_ptr, Normal, template!(Word), ErrorFollowing, + rustc_as_ptr, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations" ), rustc_attr!( - rustc_should_not_be_called_on_const_items, Normal, template!(Word), ErrorFollowing, + rustc_should_not_be_called_on_const_items, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts" ), rustc_attr!( - rustc_pass_by_value, Normal, template!(Word), ErrorFollowing, + rustc_pass_by_value, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference" ), rustc_attr!( - rustc_never_returns_null_ptr, Normal, template!(Word), ErrorFollowing, + rustc_never_returns_null_ptr, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers" ), rustc_attr!( - rustc_no_implicit_autorefs, AttributeType::Normal, template!(Word), ErrorFollowing, EncodeCrossCrate::Yes, + rustc_no_implicit_autorefs, AttributeType::Normal, ErrorFollowing, EncodeCrossCrate::Yes, "`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" ), rustc_attr!( - rustc_coherence_is_core, AttributeType::CrateLevel, template!(Word), ErrorFollowing, EncodeCrossCrate::No, + rustc_coherence_is_core, AttributeType::CrateLevel, ErrorFollowing, EncodeCrossCrate::No, "`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" ), rustc_attr!( - rustc_coinductive, AttributeType::Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No, + rustc_coinductive, AttributeType::Normal, WarnFollowing, EncodeCrossCrate::No, "`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" ), rustc_attr!( - rustc_allow_incoherent_impl, AttributeType::Normal, template!(Word), ErrorFollowing, EncodeCrossCrate::No, + rustc_allow_incoherent_impl, AttributeType::Normal, ErrorFollowing, EncodeCrossCrate::No, "`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" ), rustc_attr!( - rustc_preserve_ub_checks, AttributeType::CrateLevel, template!(Word), ErrorFollowing, EncodeCrossCrate::No, + rustc_preserve_ub_checks, AttributeType::CrateLevel, ErrorFollowing, EncodeCrossCrate::No, "`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR", ), rustc_attr!( rustc_deny_explicit_impl, AttributeType::Normal, - template!(Word), ErrorFollowing, EncodeCrossCrate::No, "`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" @@ -1305,20 +1137,19 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_dyn_incompatible_trait, AttributeType::Normal, - template!(Word), ErrorFollowing, EncodeCrossCrate::No, "`#[rustc_dyn_incompatible_trait]` marks a trait as dyn-incompatible, \ even if it otherwise satisfies the requirements to be dyn-compatible." ), rustc_attr!( - rustc_has_incoherent_inherent_impls, AttributeType::Normal, template!(Word), + rustc_has_incoherent_inherent_impls, AttributeType::Normal, ErrorFollowing, EncodeCrossCrate::Yes, "`#[rustc_has_incoherent_inherent_impls]` allows the addition of incoherent inherent impls for \ the given type by annotating all impl items with `#[rustc_allow_incoherent_impl]`" ), rustc_attr!( - rustc_non_const_trait_method, AttributeType::Normal, template!(Word), + rustc_non_const_trait_method, AttributeType::Normal, ErrorFollowing, EncodeCrossCrate::No, "`#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods \ as non-const to allow large traits an easier transition to const" @@ -1330,7 +1161,6 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ encode_cross_crate: EncodeCrossCrate::Yes, type_: Normal, safety: AttributeSafety::Normal, - template: template!(NameValueStr: "name"), duplicates: ErrorFollowing, gate: Gated { feature: sym::rustc_attrs, @@ -1342,76 +1172,76 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ }, gated!( // Used in resolve: - prelude_import, Normal, template!(Word), WarnFollowing, + prelude_import, Normal, WarnFollowing, EncodeCrossCrate::No, "`#[prelude_import]` is for use by rustc only", ), gated!( - rustc_paren_sugar, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No, + rustc_paren_sugar, Normal, WarnFollowing, EncodeCrossCrate::No, unboxed_closures, "unboxed_closures are still evolving", ), rustc_attr!( - rustc_inherit_overflow_checks, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No, + rustc_inherit_overflow_checks, Normal, WarnFollowing, EncodeCrossCrate::No, "the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ overflow checking behavior of several functions in the standard library that are inlined \ across crates", ), rustc_attr!( rustc_reservation_impl, Normal, - template!(NameValueStr: "reservation message"), ErrorFollowing, EncodeCrossCrate::Yes, + ErrorFollowing, EncodeCrossCrate::Yes, "the `#[rustc_reservation_impl]` attribute is internally used \ for reserving `impl From for T` as part of the effort to stabilize `!`" ), rustc_attr!( - rustc_test_marker, Normal, template!(NameValueStr: "name"), WarnFollowing, + rustc_test_marker, Normal, WarnFollowing, EncodeCrossCrate::No, "the `#[rustc_test_marker]` attribute is used internally to track tests", ), rustc_attr!( - rustc_unsafe_specialization_marker, Normal, template!(Word), + rustc_unsafe_specialization_marker, Normal, WarnFollowing, EncodeCrossCrate::No, "the `#[rustc_unsafe_specialization_marker]` attribute is used to check specializations" ), rustc_attr!( - rustc_specialization_trait, Normal, template!(Word), + rustc_specialization_trait, Normal, WarnFollowing, EncodeCrossCrate::No, "the `#[rustc_specialization_trait]` attribute is used to check specializations" ), rustc_attr!( - rustc_main, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::No, + rustc_main, Normal, WarnFollowing, EncodeCrossCrate::No, "the `#[rustc_main]` attribute is used internally to specify test entry point function", ), rustc_attr!( - rustc_skip_during_method_dispatch, Normal, template!(List: &["array, boxed_slice"]), ErrorFollowing, + rustc_skip_during_method_dispatch, Normal, ErrorFollowing, EncodeCrossCrate::No, "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ from method dispatch when the receiver is of the following type, for compatibility in \ editions < 2021 (array) or editions < 2024 (boxed_slice)" ), rustc_attr!( - rustc_must_implement_one_of, Normal, template!(List: &["function1, function2, ..."]), + rustc_must_implement_one_of, Normal, ErrorFollowing, EncodeCrossCrate::No, "the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ definition of a trait. Its syntax and semantics are highly experimental and will be \ subject to change before stabilization", ), rustc_attr!( - rustc_doc_primitive, Normal, template!(NameValueStr: "primitive name"), ErrorFollowing, + rustc_doc_primitive, Normal, ErrorFollowing, EncodeCrossCrate::Yes, "the `#[rustc_doc_primitive]` attribute is used by the standard library \ to provide a way to generate documentation for primitive types", ), gated!( - rustc_intrinsic, Normal, template!(Word), ErrorFollowing, EncodeCrossCrate::Yes, intrinsics, + rustc_intrinsic, Normal, ErrorFollowing, EncodeCrossCrate::Yes, intrinsics, "the `#[rustc_intrinsic]` attribute is used to declare intrinsics as function items", ), rustc_attr!( - rustc_no_mir_inline, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::Yes, + rustc_no_mir_inline, Normal, WarnFollowing, EncodeCrossCrate::Yes, "`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" ), rustc_attr!( - rustc_force_inline, Normal, template!(Word, NameValueStr: "reason"), WarnFollowing, EncodeCrossCrate::Yes, + rustc_force_inline, Normal, WarnFollowing, EncodeCrossCrate::Yes, "`#[rustc_force_inline]` forces a free function to be inlined" ), rustc_attr!( - rustc_scalable_vector, Normal, template!(List: &["count"]), WarnFollowing, EncodeCrossCrate::Yes, + rustc_scalable_vector, Normal, WarnFollowing, EncodeCrossCrate::Yes, "`#[rustc_scalable_vector]` defines a scalable vector type" ), @@ -1419,133 +1249,131 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes, Testing: // ========================================================================== - rustc_attr!(TEST, rustc_effective_visibility, Normal, template!(Word), WarnFollowing, EncodeCrossCrate::Yes), + rustc_attr!(TEST, rustc_effective_visibility, Normal, WarnFollowing, EncodeCrossCrate::Yes), rustc_attr!( - TEST, rustc_dump_inferred_outlives, Normal, template!(Word), + TEST, rustc_dump_inferred_outlives, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_capture_analysis, Normal, template!(Word), + TEST, rustc_capture_analysis, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_insignificant_dtor, Normal, template!(Word), + TEST, rustc_insignificant_dtor, Normal, WarnFollowing, EncodeCrossCrate::Yes ), rustc_attr!( - TEST, rustc_no_implicit_bounds, CrateLevel, template!(Word), + TEST, rustc_no_implicit_bounds, CrateLevel, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_strict_coherence, Normal, template!(Word), + TEST, rustc_strict_coherence, Normal, WarnFollowing, EncodeCrossCrate::Yes ), rustc_attr!( - TEST, rustc_dump_variances, Normal, template!(Word), + TEST, rustc_dump_variances, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_dump_variances_of_opaques, Normal, template!(Word), + TEST, rustc_dump_variances_of_opaques, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_hidden_type_of_opaques, Normal, template!(Word), + TEST, rustc_hidden_type_of_opaques, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_layout, Normal, template!(List: &["field1, field2, ..."]), + TEST, rustc_layout, Normal, WarnFollowing, EncodeCrossCrate::Yes ), rustc_attr!( - TEST, rustc_abi, Normal, template!(List: &["field1, field2, ..."]), + TEST, rustc_abi, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_regions, Normal, template!(Word), + TEST, rustc_regions, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_delayed_bug_from_inside_query, Normal, - template!(Word), WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_dump_user_args, Normal, template!(Word), + TEST, rustc_dump_user_args, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_evaluate_where_clauses, Normal, template!(Word), WarnFollowing, + TEST, rustc_evaluate_where_clauses, Normal, WarnFollowing, EncodeCrossCrate::Yes ), rustc_attr!( - TEST, rustc_if_this_changed, Normal, template!(Word, List: &["DepNode"]), DuplicatesOk, + TEST, rustc_if_this_changed, Normal, DuplicatesOk, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_then_this_would_need, Normal, template!(List: &["DepNode"]), DuplicatesOk, + TEST, rustc_then_this_would_need, Normal, DuplicatesOk, EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_clean, Normal, - template!(List: &[r#"cfg = "...", /*opt*/ label = "...", /*opt*/ except = "...""#]), DuplicatesOk, EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_partition_reused, Normal, - template!(List: &[r#"cfg = "...", module = "...""#]), DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_partition_codegened, Normal, - template!(List: &[r#"cfg = "...", module = "...""#]), DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_expected_cgu_reuse, Normal, - template!(List: &[r#"cfg = "...", module = "...", kind = "...""#]), DuplicatesOk, + DuplicatesOk, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_symbol_name, Normal, template!(Word), + TEST, rustc_symbol_name, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_def_path, Normal, template!(Word), + TEST, rustc_def_path, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_mir, Normal, template!(List: &["arg1, arg2, ..."]), + TEST, rustc_mir, Normal, DuplicatesOk, EncodeCrossCrate::Yes ), gated!( - custom_mir, Normal, template!(List: &[r#"dialect = "...", phase = "...""#]), + custom_mir, Normal, ErrorFollowing, EncodeCrossCrate::No, "the `#[custom_mir]` attribute is just used for the Rust test suite", ), rustc_attr!( - TEST, rustc_dump_item_bounds, Normal, template!(Word), + TEST, rustc_dump_item_bounds, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_dump_predicates, Normal, template!(Word), + TEST, rustc_dump_predicates, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_dump_def_parents, Normal, template!(Word), + TEST, rustc_dump_def_parents, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_dump_object_lifetime_defaults, Normal, template!(Word), + TEST, rustc_dump_object_lifetime_defaults, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_dump_vtable, Normal, template!(Word), + TEST, rustc_dump_vtable, Normal, WarnFollowing, EncodeCrossCrate::No ), rustc_attr!( - TEST, rustc_dummy, Normal, template!(Word /* doesn't matter*/), + TEST, rustc_dummy, Normal, DuplicatesOk, EncodeCrossCrate::No ), rustc_attr!( - TEST, pattern_complexity_limit, CrateLevel, template!(NameValueStr: "N"), + TEST, pattern_complexity_limit, CrateLevel, ErrorFollowing, EncodeCrossCrate::No, ), ]; From f967bf3f29da94f32d58e6bf3f30fea3699fe86a Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Sat, 4 Apr 2026 13:35:23 +0200 Subject: [PATCH 4/9] Remove EncodeCrossCrate from BUILTIN_ATTRIBUTES --- compiler/rustc_feature/src/builtin_attrs.rs | 452 +++++++------------ compiler/rustc_feature/src/lib.rs | 3 +- compiler/rustc_metadata/src/rmeta/encoder.rs | 4 - 3 files changed, 169 insertions(+), 290 deletions(-) diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs index 675a817890cbb..0c6dfcd98b7e1 100644 --- a/compiler/rustc_feature/src/builtin_attrs.rs +++ b/compiler/rustc_feature/src/builtin_attrs.rs @@ -7,7 +7,6 @@ use AttributeGate::*; use AttributeType::*; use rustc_data_structures::fx::FxHashMap; use rustc_hir::AttrStyle; -use rustc_hir::attrs::EncodeCrossCrate; use rustc_span::edition::Edition; use rustc_span::{Symbol, sym}; @@ -266,30 +265,27 @@ macro_rules! template { } macro_rules! ungated { - (unsafe($edition:ident) $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { + (unsafe($edition:ident) $attr:ident, $typ:expr, $duplicates:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: Some(Edition::$edition) }, gate: Ungated, duplicates: $duplicates, } }; - (unsafe $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $duplicates:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, gate: Ungated, duplicates: $duplicates, } }; - ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, gate: Ungated, @@ -299,10 +295,9 @@ macro_rules! ungated { } macro_rules! gated { - (unsafe $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $gate:ident, $message:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $duplicates:expr, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, duplicates: $duplicates, @@ -314,10 +309,9 @@ macro_rules! gated { }, } }; - (unsafe $attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $message:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $duplicates:expr, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, duplicates: $duplicates, @@ -329,10 +323,9 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $gate:ident, $message:expr $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, duplicates: $duplicates, @@ -344,10 +337,9 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $message:expr $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, duplicates: $duplicates, @@ -362,12 +354,11 @@ macro_rules! gated { } macro_rules! rustc_attr { - (TEST, $attr:ident, $typ:expr, $duplicate:expr, $encode_cross_crate:expr $(,)?) => { + (TEST, $attr:ident, $typ:expr, $duplicate:expr $(,)?) => { rustc_attr!( $attr, $typ, $duplicate, - $encode_cross_crate, concat!( "the `#[", stringify!($attr), @@ -375,10 +366,9 @@ macro_rules! rustc_attr { ), ) }; - ($attr:ident, $typ:expr, $duplicates:expr, $encode_cross_crate:expr, $($notes:expr),* $(,)?) => { + ($attr:ident, $typ:expr, $duplicates:expr, $($notes:expr),* $(,)?) => { BuiltinAttribute { name: sym::$attr, - encode_cross_crate: $encode_cross_crate, type_: $typ, safety: AttributeSafety::Normal, duplicates: $duplicates, @@ -405,11 +395,6 @@ macro_rules! experimental { pub struct BuiltinAttribute { pub name: Symbol, - /// Whether this attribute is encode cross crate. - /// - /// If so, it is encoded in the crate metadata. - /// Otherwise, it can only be used in the local crate. - pub encode_cross_crate: EncodeCrossCrate, pub type_: AttributeType, pub safety: AttributeSafety, pub duplicates: AttributeDuplicates, @@ -426,245 +411,242 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Conditional compilation: ungated!( cfg, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), ungated!( cfg_attr, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), // Testing: ungated!( ignore, Normal, - WarnFollowing, EncodeCrossCrate::No, + WarnFollowing, ), ungated!( should_panic, Normal, - FutureWarnFollowing, EncodeCrossCrate::No, + FutureWarnFollowing, ), // Macros: ungated!( automatically_derived, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), ungated!( macro_use, Normal, - WarnFollowingWordOnly, EncodeCrossCrate::No, + WarnFollowingWordOnly, ), - ungated!(macro_escape, Normal, WarnFollowing, EncodeCrossCrate::No), // Deprecated synonym for `macro_use`. + ungated!(macro_escape, Normal, WarnFollowing,), // Deprecated synonym for `macro_use`. ungated!( macro_export, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), ungated!( proc_macro, Normal, - ErrorFollowing, EncodeCrossCrate::No + ErrorFollowing, ), ungated!( proc_macro_derive, Normal, - ErrorFollowing, EncodeCrossCrate::No, + ErrorFollowing, ), ungated!( proc_macro_attribute, Normal, - ErrorFollowing, EncodeCrossCrate::No + ErrorFollowing, ), // Lints: ungated!( warn, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( allow, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( expect, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( forbid, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), ungated!( deny, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), ungated!( must_use, Normal, - FutureWarnFollowing, EncodeCrossCrate::Yes + FutureWarnFollowing, ), gated!( - must_not_suspend, Normal, WarnFollowing, - EncodeCrossCrate::Yes, experimental!(must_not_suspend) + must_not_suspend, Normal, WarnFollowing, experimental!(must_not_suspend) ), ungated!( deprecated, Normal, - ErrorFollowing, EncodeCrossCrate::Yes + ErrorFollowing, ), // Crate properties: ungated!( crate_name, CrateLevel, - FutureWarnFollowing, EncodeCrossCrate::No, + FutureWarnFollowing, ), ungated!( crate_type, CrateLevel, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), // ABI, linking, symbols, and FFI ungated!( link, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( link_name, Normal, - FutureWarnPreceding, EncodeCrossCrate::Yes + FutureWarnPreceding, ), ungated!( no_link, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), ungated!( repr, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), // FIXME(#82232, #143834): temporarily renamed to mitigate `#[align]` nameres ambiguity - gated!(rustc_align, Normal, DuplicatesOk, EncodeCrossCrate::No, fn_align, experimental!(rustc_align)), - gated!(rustc_align_static, Normal, DuplicatesOk, EncodeCrossCrate::No, static_align, experimental!(rustc_align_static)), + gated!(rustc_align, Normal, DuplicatesOk, fn_align, experimental!(rustc_align)), + gated!(rustc_align_static, Normal, DuplicatesOk, static_align, experimental!(rustc_align_static)), ungated!( unsafe(Edition2024) export_name, Normal, - FutureWarnPreceding, EncodeCrossCrate::No + FutureWarnPreceding, ), ungated!( unsafe(Edition2024) link_section, Normal, - FutureWarnPreceding, EncodeCrossCrate::No + FutureWarnPreceding, ), ungated!( unsafe(Edition2024) no_mangle, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), ungated!( used, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), ungated!( link_ordinal, Normal, - ErrorPreceding, EncodeCrossCrate::Yes + ErrorPreceding, ), ungated!( unsafe naked, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), // See `TyAndLayout::pass_indirectly_in_non_rustic_abis` for details. rustc_attr!( rustc_pass_indirectly_in_non_rustic_abis, Normal, ErrorFollowing, - EncodeCrossCrate::No, "types marked with `#[rustc_pass_indirectly_in_non_rustic_abis]` are always passed indirectly by non-Rustic ABIs" ), // Limits: ungated!( recursion_limit, CrateLevel, - FutureWarnFollowing, EncodeCrossCrate::No + FutureWarnFollowing, ), ungated!( type_length_limit, CrateLevel, - FutureWarnFollowing, EncodeCrossCrate::No + FutureWarnFollowing, ), gated!( - move_size_limit, CrateLevel, ErrorFollowing, - EncodeCrossCrate::No, large_assignments, experimental!(move_size_limit) + move_size_limit, CrateLevel, ErrorFollowing, large_assignments, experimental!(move_size_limit) ), // Entry point: ungated!( no_main, CrateLevel, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), // Modules, prelude, and resolution: ungated!( path, Normal, - FutureWarnFollowing, EncodeCrossCrate::No + FutureWarnFollowing, ), ungated!( no_std, CrateLevel, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), ungated!( no_implicit_prelude, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), ungated!( non_exhaustive, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), // Runtime ungated!( windows_subsystem, CrateLevel, - FutureWarnFollowing, EncodeCrossCrate::No + FutureWarnFollowing, ), ungated!( // RFC 2070 panic_handler, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), // Code generation: ungated!( inline, Normal, - FutureWarnFollowing, EncodeCrossCrate::No + FutureWarnFollowing, ), ungated!( cold, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), ungated!( no_builtins, CrateLevel, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), ungated!( target_feature, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( track_caller, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), ungated!( instruction_set, Normal, - ErrorPreceding, EncodeCrossCrate::No + ErrorPreceding, ), gated!( unsafe force_target_feature, Normal, - DuplicatesOk, EncodeCrossCrate::No, effective_target_features, experimental!(force_target_feature) + DuplicatesOk, effective_target_features, experimental!(force_target_feature) ), gated!( sanitize, Normal, ErrorPreceding, - EncodeCrossCrate::No, sanitize, experimental!(sanitize), + sanitize, experimental!(sanitize), ), gated!( coverage, Normal, - ErrorPreceding, EncodeCrossCrate::No, + ErrorPreceding, coverage_attribute, experimental!(coverage) ), ungated!( doc, Normal, - DuplicatesOk, EncodeCrossCrate::Yes + DuplicatesOk, ), // Debugging ungated!( debugger_visualizer, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), ungated!( collapse_debuginfo, Normal, - ErrorFollowing, EncodeCrossCrate::Yes + ErrorFollowing, ), // ========================================================================== @@ -673,71 +655,62 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Linking: gated!( - export_stable, Normal, WarnFollowing, - EncodeCrossCrate::No, experimental!(export_stable) + export_stable, Normal, WarnFollowing, experimental!(export_stable) ), // Testing: gated!( - test_runner, CrateLevel, ErrorFollowing, - EncodeCrossCrate::Yes, custom_test_frameworks, + test_runner, CrateLevel, ErrorFollowing, custom_test_frameworks, "custom test frameworks are an unstable feature", ), gated!( - reexport_test_harness_main, CrateLevel, ErrorFollowing, - EncodeCrossCrate::No, custom_test_frameworks, + reexport_test_harness_main, CrateLevel, ErrorFollowing, custom_test_frameworks, "custom test frameworks are an unstable feature", ), // RFC #1268 gated!( - marker, Normal, WarnFollowing, EncodeCrossCrate::No, - marker_trait_attr, experimental!(marker) + marker, Normal, WarnFollowing,marker_trait_attr, experimental!(marker) ), gated!( - thread_local, Normal, WarnFollowing, EncodeCrossCrate::No, - "`#[thread_local]` is an experimental feature, and does not currently handle destructors", + thread_local, Normal, WarnFollowing,"`#[thread_local]` is an experimental feature, and does not currently handle destructors", ), gated!( - no_core, CrateLevel, WarnFollowing, - EncodeCrossCrate::No, experimental!(no_core) + no_core, CrateLevel, WarnFollowing, experimental!(no_core) ), // RFC 2412 gated!( optimize, Normal, ErrorPreceding, - EncodeCrossCrate::No, optimize_attribute, experimental!(optimize) + optimize_attribute, experimental!(optimize) ), gated!( - unsafe ffi_pure, Normal, WarnFollowing, - EncodeCrossCrate::No, experimental!(ffi_pure) + unsafe ffi_pure, Normal, WarnFollowing, experimental!(ffi_pure) ), gated!( - unsafe ffi_const, Normal, WarnFollowing, - EncodeCrossCrate::No, experimental!(ffi_const) + unsafe ffi_const, Normal, WarnFollowing, experimental!(ffi_const) ), gated!( register_tool, CrateLevel, DuplicatesOk, - EncodeCrossCrate::No, experimental!(register_tool), + experimental!(register_tool), ), // `#[cfi_encoding = ""]` gated!( cfi_encoding, Normal, ErrorPreceding, - EncodeCrossCrate::Yes, experimental!(cfi_encoding) + experimental!(cfi_encoding) ), // `#[coroutine]` attribute to be applied to closures to make them coroutines instead gated!( - coroutine, Normal, ErrorFollowing, - EncodeCrossCrate::No, coroutines, experimental!(coroutine) + coroutine, Normal, ErrorFollowing, coroutines, experimental!(coroutine) ), // RFC 3543 // `#[patchable_function_entry(prefix_nops = m, entry_nops = n)]` gated!( patchable_function_entry, Normal, ErrorPreceding, - EncodeCrossCrate::Yes, experimental!(patchable_function_entry) + experimental!(patchable_function_entry) ), // The `#[loop_match]` and `#[const_continue]` attributes are part of the @@ -745,12 +718,10 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/132306 gated!( - const_continue, Normal, ErrorFollowing, - EncodeCrossCrate::No, loop_match, experimental!(const_continue) + const_continue, Normal, ErrorFollowing, loop_match, experimental!(const_continue) ), gated!( - loop_match, Normal, ErrorFollowing, - EncodeCrossCrate::No, loop_match, experimental!(loop_match) + loop_match, Normal, ErrorFollowing, loop_match, experimental!(loop_match) ), // The `#[pin_v2]` attribute is part of the `pin_ergonomics` experiment @@ -758,8 +729,7 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/130494 gated!( - pin_v2, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, pin_ergonomics, experimental!(pin_v2), + pin_v2, Normal, ErrorFollowing, pin_ergonomics, experimental!(pin_v2), ), // ========================================================================== @@ -768,63 +738,58 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ ungated!( feature, CrateLevel, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), // DuplicatesOk since it has its own validation ungated!( stable, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( unstable, Normal, DuplicatesOk, - EncodeCrossCrate::Yes ), ungated!( unstable_feature_bound, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( rustc_const_unstable, Normal, - DuplicatesOk, EncodeCrossCrate::Yes + DuplicatesOk, ), ungated!( rustc_const_stable, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, ), ungated!( rustc_default_body_unstable, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), gated!( allow_internal_unstable, Normal, - DuplicatesOk, EncodeCrossCrate::Yes, + DuplicatesOk, "allow_internal_unstable side-steps feature gating and stability checks", ), gated!( - allow_internal_unsafe, Normal, WarnFollowing, - EncodeCrossCrate::No, "allow_internal_unsafe side-steps the unsafe_code lint", + allow_internal_unsafe, Normal, WarnFollowing, "allow_internal_unsafe side-steps the unsafe_code lint", ), gated!( rustc_eii_foreign_item, Normal, - ErrorFollowing, EncodeCrossCrate::Yes, eii_internals, + ErrorFollowing, eii_internals, "used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), rustc_attr!( rustc_allowed_through_unstable_modules, Normal, - WarnFollowing, EncodeCrossCrate::No, - "rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \ + WarnFollowing,"rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \ through unstable paths" ), rustc_attr!( rustc_deprecated_safe_2024, Normal, - ErrorFollowing, EncodeCrossCrate::Yes, - "`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", + ErrorFollowing,"`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", ), rustc_attr!( rustc_pub_transparent, Normal, - ErrorFollowing, EncodeCrossCrate::Yes, - "used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", + ErrorFollowing,"used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), @@ -832,10 +797,9 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes: Type system related: // ========================================================================== - gated!(fundamental, Normal, WarnFollowing, EncodeCrossCrate::Yes, experimental!(fundamental)), + gated!(fundamental, Normal, WarnFollowing, experimental!(fundamental)), gated!( - may_dangle, Normal, WarnFollowing, - EncodeCrossCrate::No, dropck_eyepatch, + may_dangle, Normal, WarnFollowing, dropck_eyepatch, "`may_dangle` has unstable semantics and may be removed in the future", ), @@ -843,7 +807,6 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_never_type_options, Normal, ErrorFollowing, - EncodeCrossCrate::No, "`rustc_never_type_options` is used to experiment with never type fallback and work on \ never type stabilization" ), @@ -854,53 +817,41 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_allocator, Normal, WarnFollowing, - EncodeCrossCrate::No, ), rustc_attr!( rustc_nounwind, Normal, WarnFollowing, - EncodeCrossCrate::No, ), rustc_attr!( rustc_reallocator, Normal, WarnFollowing, - EncodeCrossCrate::No, ), rustc_attr!( rustc_deallocator, Normal, WarnFollowing, - EncodeCrossCrate::No, ), rustc_attr!( rustc_allocator_zeroed, Normal, WarnFollowing, - EncodeCrossCrate::No, ), rustc_attr!( rustc_allocator_zeroed_variant, Normal, ErrorPreceding, - EncodeCrossCrate::Yes, ), gated!( - default_lib_allocator, Normal, WarnFollowing, - EncodeCrossCrate::No, allocator_internals, experimental!(default_lib_allocator), + default_lib_allocator, Normal, WarnFollowing, allocator_internals, experimental!(default_lib_allocator), ), gated!( - needs_allocator, Normal, WarnFollowing, - EncodeCrossCrate::No, allocator_internals, experimental!(needs_allocator), + needs_allocator, Normal, WarnFollowing, allocator_internals, experimental!(needs_allocator), ), gated!( - panic_runtime, CrateLevel, WarnFollowing, - EncodeCrossCrate::No, experimental!(panic_runtime) + panic_runtime, CrateLevel, WarnFollowing, experimental!(panic_runtime) ), gated!( - needs_panic_runtime, CrateLevel, WarnFollowing, - EncodeCrossCrate::No, experimental!(needs_panic_runtime) + needs_panic_runtime, CrateLevel, WarnFollowing, experimental!(needs_panic_runtime) ), gated!( compiler_builtins, CrateLevel, WarnFollowing, - EncodeCrossCrate::No, "the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate \ which contains compiler-rt intrinsics and will never be stable", ), gated!( profiler_runtime, CrateLevel, WarnFollowing, - EncodeCrossCrate::No, "the `#[profiler_runtime]` attribute is used to identify the `profiler_builtins` crate \ which contains the profiler runtime and will never be stable", ), @@ -911,20 +862,17 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ gated!( linkage, Normal, - ErrorPreceding, EncodeCrossCrate::No, + ErrorPreceding, "the `linkage` attribute is experimental and not portable across platforms", ), rustc_attr!( rustc_std_internal_symbol, Normal, WarnFollowing, - EncodeCrossCrate::No, ), rustc_attr!( rustc_objc_class, Normal, ErrorPreceding, - EncodeCrossCrate::No, ), rustc_attr!( rustc_objc_selector, Normal, ErrorPreceding, - EncodeCrossCrate::No, ), // ========================================================================== @@ -934,38 +882,31 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_builtin_macro, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, ), rustc_attr!( rustc_proc_macro_decls, Normal, WarnFollowing, - EncodeCrossCrate::No, ), rustc_attr!( rustc_macro_transparency, Normal, - ErrorFollowing, - EncodeCrossCrate::Yes, "used internally for testing macro hygiene", + ErrorFollowing, "used internally for testing macro hygiene", ), rustc_attr!( rustc_autodiff, Normal, DuplicatesOk, - EncodeCrossCrate::Yes, ), rustc_attr!( rustc_offload_kernel, Normal, DuplicatesOk, - EncodeCrossCrate::Yes, ), // Traces that are left when `cfg` and `cfg_attr` attributes are expanded. // The attributes are not gated, to avoid stability errors, but they cannot be used in stable // or unstable code directly because `sym::cfg_(attr_)trace` are not valid identifiers, they // can only be generated by the compiler. ungated!( - cfg_trace, Normal, DuplicatesOk, - EncodeCrossCrate::Yes + cfg_trace, Normal, DuplicatesOk ), ungated!( - cfg_attr_trace, Normal, DuplicatesOk, - EncodeCrossCrate::No + cfg_attr_trace, Normal, DuplicatesOk ), // ========================================================================== @@ -974,47 +915,46 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_on_unimplemented, Normal, - ErrorFollowing, EncodeCrossCrate::Yes, - "see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" + ErrorFollowing,"see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" ), rustc_attr!( rustc_confusables, Normal, - ErrorFollowing, EncodeCrossCrate::Yes, + ErrorFollowing, ), // Enumerates "identity-like" conversion methods to suggest on type mismatch. rustc_attr!( rustc_conversion_suggestion, Normal, - WarnFollowing, EncodeCrossCrate::Yes, + WarnFollowing, ), // Prevents field reads in the marked trait or method to be considered // during dead code analysis. rustc_attr!( rustc_trivial_field_reads, Normal, - WarnFollowing, EncodeCrossCrate::Yes, + WarnFollowing, ), // Used by the `rustc::potential_query_instability` lint to warn methods which // might not be stable during incremental compilation. rustc_attr!( rustc_lint_query_instability, Normal, - WarnFollowing, EncodeCrossCrate::Yes, + WarnFollowing, ), // Used by the `rustc::untracked_query_information` lint to warn methods which // might not be stable during incremental compilation. rustc_attr!( rustc_lint_untracked_query_information, Normal, - WarnFollowing, EncodeCrossCrate::Yes, + WarnFollowing, ), // Used by the `rustc::bad_opt_access` lint to identify `DebuggingOptions` and `CodegenOptions` // types (as well as any others in future). rustc_attr!( rustc_lint_opt_ty, Normal, - WarnFollowing, EncodeCrossCrate::Yes, + WarnFollowing, ), // Used by the `rustc::bad_opt_access` lint on fields // types (as well as any others in future). rustc_attr!( rustc_lint_opt_deny_field_access, Normal, - WarnFollowing, EncodeCrossCrate::Yes, + WarnFollowing, ), // ========================================================================== @@ -1022,30 +962,25 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== rustc_attr!( - rustc_promotable, Normal, WarnFollowing, - EncodeCrossCrate::No, ), + rustc_promotable, Normal, WarnFollowing, ), rustc_attr!( rustc_legacy_const_generics, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, ), // Do not const-check this function's body. It will always get replaced during CTFE via `hook_special_const_fn`. rustc_attr!( - rustc_do_not_const_check, Normal, WarnFollowing, - EncodeCrossCrate::Yes, "`#[rustc_do_not_const_check]` skips const-check for this function's body", + rustc_do_not_const_check, Normal, WarnFollowing, "`#[rustc_do_not_const_check]` skips const-check for this function's body", ), rustc_attr!( rustc_const_stable_indirect, Normal, - WarnFollowing, - EncodeCrossCrate::No, - "this is an internal implementation detail", + WarnFollowing,"this is an internal implementation detail", ), rustc_attr!( rustc_intrinsic_const_stable_indirect, Normal, - WarnFollowing, EncodeCrossCrate::No, "this is an internal implementation detail", + WarnFollowing, "this is an internal implementation detail", ), rustc_attr!( rustc_allow_const_fn_unstable, Normal, - DuplicatesOk, EncodeCrossCrate::No, + DuplicatesOk, "rustc_allow_const_fn_unstable side-steps feature gating and stability checks" ), @@ -1055,25 +990,21 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_layout_scalar_valid_range_start, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \ niche optimizations in the standard library", ), rustc_attr!( rustc_layout_scalar_valid_range_end, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \ niche optimizations in the standard library", ), rustc_attr!( rustc_simd_monomorphize_lane_limit, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "the `#[rustc_simd_monomorphize_lane_limit]` attribute is just used by std::simd \ for better error messages", ), rustc_attr!( rustc_nonnull_optimization_guaranteed, Normal, WarnFollowing, - EncodeCrossCrate::Yes, "the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to document \ guaranteed niche optimizations in the standard library", "the compiler does not even check whether the type indeed is being non-null-optimized; \ @@ -1084,85 +1015,67 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes, Misc: // ========================================================================== gated!( - lang, Normal, DuplicatesOk, EncodeCrossCrate::No, lang_items, + lang, Normal, DuplicatesOk, lang_items, "lang items are subject to change", ), rustc_attr!( rustc_as_ptr, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations" ), rustc_attr!( rustc_should_not_be_called_on_const_items, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts" ), rustc_attr!( rustc_pass_by_value, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference" ), rustc_attr!( rustc_never_returns_null_ptr, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers" ), rustc_attr!( - rustc_no_implicit_autorefs, AttributeType::Normal, ErrorFollowing, EncodeCrossCrate::Yes, - "`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" + rustc_no_implicit_autorefs, AttributeType::Normal, ErrorFollowing,"`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" ), rustc_attr!( - rustc_coherence_is_core, AttributeType::CrateLevel, ErrorFollowing, EncodeCrossCrate::No, - "`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" + rustc_coherence_is_core, AttributeType::CrateLevel, ErrorFollowing,"`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" ), rustc_attr!( - rustc_coinductive, AttributeType::Normal, WarnFollowing, EncodeCrossCrate::No, - "`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" + rustc_coinductive, AttributeType::Normal, WarnFollowing,"`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" ), rustc_attr!( - rustc_allow_incoherent_impl, AttributeType::Normal, ErrorFollowing, EncodeCrossCrate::No, - "`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" + rustc_allow_incoherent_impl, AttributeType::Normal, ErrorFollowing,"`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" ), rustc_attr!( - rustc_preserve_ub_checks, AttributeType::CrateLevel, ErrorFollowing, EncodeCrossCrate::No, - "`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR", + rustc_preserve_ub_checks, AttributeType::CrateLevel, ErrorFollowing,"`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR", ), rustc_attr!( rustc_deny_explicit_impl, AttributeType::Normal, - ErrorFollowing, - EncodeCrossCrate::No, - "`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" + ErrorFollowing,"`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" ), rustc_attr!( rustc_dyn_incompatible_trait, AttributeType::Normal, - ErrorFollowing, - EncodeCrossCrate::No, - "`#[rustc_dyn_incompatible_trait]` marks a trait as dyn-incompatible, \ + ErrorFollowing,"`#[rustc_dyn_incompatible_trait]` marks a trait as dyn-incompatible, \ even if it otherwise satisfies the requirements to be dyn-compatible." ), rustc_attr!( rustc_has_incoherent_inherent_impls, AttributeType::Normal, - ErrorFollowing, EncodeCrossCrate::Yes, - "`#[rustc_has_incoherent_inherent_impls]` allows the addition of incoherent inherent impls for \ + ErrorFollowing,"`#[rustc_has_incoherent_inherent_impls]` allows the addition of incoherent inherent impls for \ the given type by annotating all impl items with `#[rustc_allow_incoherent_impl]`" ), rustc_attr!( rustc_non_const_trait_method, AttributeType::Normal, - ErrorFollowing, EncodeCrossCrate::No, - "`#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods \ + ErrorFollowing,"`#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods \ as non-const to allow large traits an easier transition to const" ), BuiltinAttribute { name: sym::rustc_diagnostic_item, - // FIXME: This can be `true` once we always use `tcx.is_diagnostic_item`. - encode_cross_crate: EncodeCrossCrate::Yes, type_: Normal, safety: AttributeSafety::Normal, - duplicates: ErrorFollowing, - gate: Gated { + duplicates: ErrorFollowing,gate: Gated { feature: sym::rustc_attrs, message: "use of an internal attribute", check: Features::rustc_attrs, @@ -1172,209 +1085,190 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ }, gated!( // Used in resolve: - prelude_import, Normal, WarnFollowing, - EncodeCrossCrate::No, "`#[prelude_import]` is for use by rustc only", + prelude_import, Normal, WarnFollowing, "`#[prelude_import]` is for use by rustc only", ), gated!( - rustc_paren_sugar, Normal, WarnFollowing, EncodeCrossCrate::No, - unboxed_closures, "unboxed_closures are still evolving", + rustc_paren_sugar, Normal, WarnFollowing,unboxed_closures, "unboxed_closures are still evolving", ), rustc_attr!( - rustc_inherit_overflow_checks, Normal, WarnFollowing, EncodeCrossCrate::No, - "the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ + rustc_inherit_overflow_checks, Normal, WarnFollowing,"the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ overflow checking behavior of several functions in the standard library that are inlined \ across crates", ), rustc_attr!( rustc_reservation_impl, Normal, - ErrorFollowing, EncodeCrossCrate::Yes, - "the `#[rustc_reservation_impl]` attribute is internally used \ + ErrorFollowing,"the `#[rustc_reservation_impl]` attribute is internally used \ for reserving `impl From for T` as part of the effort to stabilize `!`" ), rustc_attr!( - rustc_test_marker, Normal, WarnFollowing, - EncodeCrossCrate::No, "the `#[rustc_test_marker]` attribute is used internally to track tests", + rustc_test_marker, Normal, WarnFollowing, "the `#[rustc_test_marker]` attribute is used internally to track tests", ), rustc_attr!( rustc_unsafe_specialization_marker, Normal, - WarnFollowing, EncodeCrossCrate::No, - "the `#[rustc_unsafe_specialization_marker]` attribute is used to check specializations" + WarnFollowing,"the `#[rustc_unsafe_specialization_marker]` attribute is used to check specializations" ), rustc_attr!( rustc_specialization_trait, Normal, - WarnFollowing, EncodeCrossCrate::No, - "the `#[rustc_specialization_trait]` attribute is used to check specializations" + WarnFollowing,"the `#[rustc_specialization_trait]` attribute is used to check specializations" ), rustc_attr!( - rustc_main, Normal, WarnFollowing, EncodeCrossCrate::No, - "the `#[rustc_main]` attribute is used internally to specify test entry point function", + rustc_main, Normal, WarnFollowing,"the `#[rustc_main]` attribute is used internally to specify test entry point function", ), rustc_attr!( rustc_skip_during_method_dispatch, Normal, ErrorFollowing, - EncodeCrossCrate::No, "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ from method dispatch when the receiver is of the following type, for compatibility in \ editions < 2021 (array) or editions < 2024 (boxed_slice)" ), rustc_attr!( rustc_must_implement_one_of, Normal, - ErrorFollowing, EncodeCrossCrate::No, - "the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ + ErrorFollowing,"the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ definition of a trait. Its syntax and semantics are highly experimental and will be \ subject to change before stabilization", ), rustc_attr!( - rustc_doc_primitive, Normal, ErrorFollowing, - EncodeCrossCrate::Yes, "the `#[rustc_doc_primitive]` attribute is used by the standard library \ + rustc_doc_primitive, Normal, ErrorFollowing, "the `#[rustc_doc_primitive]` attribute is used by the standard library \ to provide a way to generate documentation for primitive types", ), gated!( - rustc_intrinsic, Normal, ErrorFollowing, EncodeCrossCrate::Yes, intrinsics, + rustc_intrinsic, Normal, ErrorFollowing, intrinsics, "the `#[rustc_intrinsic]` attribute is used to declare intrinsics as function items", ), rustc_attr!( - rustc_no_mir_inline, Normal, WarnFollowing, EncodeCrossCrate::Yes, - "`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" + rustc_no_mir_inline, Normal, WarnFollowing,"`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" ), rustc_attr!( - rustc_force_inline, Normal, WarnFollowing, EncodeCrossCrate::Yes, - "`#[rustc_force_inline]` forces a free function to be inlined" + rustc_force_inline, Normal, WarnFollowing,"`#[rustc_force_inline]` forces a free function to be inlined" ), rustc_attr!( - rustc_scalable_vector, Normal, WarnFollowing, EncodeCrossCrate::Yes, - "`#[rustc_scalable_vector]` defines a scalable vector type" + rustc_scalable_vector, Normal, WarnFollowing,"`#[rustc_scalable_vector]` defines a scalable vector type" ), // ========================================================================== // Internal attributes, Testing: // ========================================================================== - rustc_attr!(TEST, rustc_effective_visibility, Normal, WarnFollowing, EncodeCrossCrate::Yes), + rustc_attr!(TEST, rustc_effective_visibility, Normal, WarnFollowing,), rustc_attr!( TEST, rustc_dump_inferred_outlives, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_capture_analysis, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_insignificant_dtor, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), rustc_attr!( TEST, rustc_no_implicit_bounds, CrateLevel, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_strict_coherence, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), rustc_attr!( TEST, rustc_dump_variances, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_dump_variances_of_opaques, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_hidden_type_of_opaques, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_layout, Normal, - WarnFollowing, EncodeCrossCrate::Yes + WarnFollowing, ), rustc_attr!( TEST, rustc_abi, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_regions, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_delayed_bug_from_inside_query, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_dump_user_args, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_evaluate_where_clauses, Normal, WarnFollowing, - EncodeCrossCrate::Yes ), rustc_attr!( TEST, rustc_if_this_changed, Normal, DuplicatesOk, - EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_then_this_would_need, Normal, DuplicatesOk, - EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_clean, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), rustc_attr!( TEST, rustc_partition_reused, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), rustc_attr!( TEST, rustc_partition_codegened, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), rustc_attr!( TEST, rustc_expected_cgu_reuse, Normal, DuplicatesOk, - EncodeCrossCrate::No ), rustc_attr!( TEST, rustc_symbol_name, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_def_path, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_mir, Normal, - DuplicatesOk, EncodeCrossCrate::Yes + DuplicatesOk, ), gated!( custom_mir, Normal, - ErrorFollowing, EncodeCrossCrate::No, - "the `#[custom_mir]` attribute is just used for the Rust test suite", + ErrorFollowing,"the `#[custom_mir]` attribute is just used for the Rust test suite", ), rustc_attr!( TEST, rustc_dump_item_bounds, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_dump_predicates, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_dump_def_parents, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_dump_object_lifetime_defaults, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_dump_vtable, Normal, - WarnFollowing, EncodeCrossCrate::No + WarnFollowing, ), rustc_attr!( TEST, rustc_dummy, Normal, - DuplicatesOk, EncodeCrossCrate::No + DuplicatesOk, ), rustc_attr!( TEST, pattern_complexity_limit, CrateLevel, - ErrorFollowing, EncodeCrossCrate::No, + ErrorFollowing, ), ]; @@ -1382,16 +1276,6 @@ pub fn is_builtin_attr_name(name: Symbol) -> bool { BUILTIN_ATTRIBUTE_MAP.get(&name).is_some() } -/// Whether this builtin attribute is encoded cross crate. -/// This means it can be used cross crate. -pub fn encode_cross_crate(name: Symbol) -> bool { - if let Some(attr) = BUILTIN_ATTRIBUTE_MAP.get(&name) { - attr.encode_cross_crate == EncodeCrossCrate::Yes - } else { - true - } -} - pub fn is_valid_for_get_attr(name: Symbol) -> bool { BUILTIN_ATTRIBUTE_MAP.get(&name).is_some_and(|attr| match attr.duplicates { WarnFollowing | ErrorFollowing | ErrorPreceding | FutureWarnFollowing diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs index 9d046bdef1cf3..3a5b153d6be30 100644 --- a/compiler/rustc_feature/src/lib.rs +++ b/compiler/rustc_feature/src/lib.rs @@ -131,8 +131,7 @@ pub use accepted::ACCEPTED_LANG_FEATURES; pub use builtin_attrs::{ AttrSuggestionStyle, AttributeDuplicates, AttributeGate, AttributeSafety, AttributeTemplate, AttributeType, BUILTIN_ATTRIBUTE_MAP, BUILTIN_ATTRIBUTES, BuiltinAttribute, GatedCfg, - encode_cross_crate, find_gated_cfg, is_builtin_attr_name, is_stable_diagnostic_attribute, - is_valid_for_get_attr, + find_gated_cfg, is_builtin_attr_name, is_stable_diagnostic_attribute, is_valid_for_get_attr, }; pub use removed::REMOVED_LANG_FEATURES; pub use unstable::{ diff --git a/compiler/rustc_metadata/src/rmeta/encoder.rs b/compiler/rustc_metadata/src/rmeta/encoder.rs index 8bf919dab8e79..3f8c11a87e85b 100644 --- a/compiler/rustc_metadata/src/rmeta/encoder.rs +++ b/compiler/rustc_metadata/src/rmeta/encoder.rs @@ -864,10 +864,6 @@ fn analyze_attr(attr: &hir::Attribute, state: &mut AnalyzeAttrState<'_>) -> bool && p.encode_cross_crate() == EncodeCrossCrate::No { // Attributes not marked encode-cross-crate don't need to be encoded for downstream crates. - } else if let Some(name) = attr.name() - && !rustc_feature::encode_cross_crate(name) - { - // Attributes not marked encode-cross-crate don't need to be encoded for downstream crates. } else if let hir::Attribute::Parsed(AttributeKind::DocComment { .. }) = attr { // We keep all doc comments reachable to rustdoc because they might be "imported" into // downstream crates if they use `#[doc(inline)]` to copy an item's documentation into From eecf63c1253de928ef8ecd0477f725ac7e5bc560 Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Sat, 4 Apr 2026 13:47:12 +0200 Subject: [PATCH 5/9] Remove AttributeDuplicates from BUILTIN_ATTRIBUTES --- compiler/rustc_feature/src/builtin_attrs.rs | 566 +++++++------------- compiler/rustc_feature/src/lib.rs | 6 +- compiler/rustc_middle/src/ty/mod.rs | 9 +- compiler/rustc_passes/src/check_attr.rs | 79 +-- compiler/rustc_passes/src/errors.rs | 24 - 5 files changed, 195 insertions(+), 489 deletions(-) diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs index 0c6dfcd98b7e1..3e8e71c2d6834 100644 --- a/compiler/rustc_feature/src/builtin_attrs.rs +++ b/compiler/rustc_feature/src/builtin_attrs.rs @@ -2,7 +2,6 @@ use std::sync::LazyLock; -use AttributeDuplicates::*; use AttributeGate::*; use AttributeType::*; use rustc_data_structures::fx::FxHashMap; @@ -74,7 +73,7 @@ pub fn find_gated_cfg(pred: impl Fn(Symbol) -> bool) -> Option<&'static GatedCfg #[derive(Copy, Clone, PartialEq, Debug)] pub enum AttributeType { - /// Normal, builtin attribute that is consumed + /// Normal,builtin attribute that is consumed /// by the compiler before the unused_attribute check Normal, /// Builtin attribute that is only allowed at the crate level @@ -178,57 +177,6 @@ impl AttributeTemplate { } } -/// How to handle multiple duplicate attributes on the same item. -#[derive(Clone, Copy, Default)] -pub enum AttributeDuplicates { - /// Duplicates of this attribute are allowed. - /// - /// This should only be used with attributes where duplicates have semantic - /// meaning, or some kind of "additive" behavior. For example, `#[warn(..)]` - /// can be specified multiple times, and it combines all the entries. Or use - /// this if there is validation done elsewhere. - #[default] - DuplicatesOk, - /// Duplicates after the first attribute will be an unused_attribute warning. - /// - /// This is usually used for "word" attributes, where they are used as a - /// boolean marker, like `#[used]`. It is not necessarily wrong that there - /// are duplicates, but the others should probably be removed. - WarnFollowing, - /// Same as `WarnFollowing`, but only issues warnings for word-style attributes. - /// - /// This is only for special cases, for example multiple `#[macro_use]` can - /// be warned, but multiple `#[macro_use(...)]` should not because the list - /// form has different meaning from the word form. - WarnFollowingWordOnly, - /// Duplicates after the first attribute will be an error. - /// - /// This should be used where duplicates would be ignored, but carry extra - /// meaning that could cause confusion. For example, `#[stable(since="1.0")] - /// #[stable(since="2.0")]`, which version should be used for `stable`? - ErrorFollowing, - /// Duplicates preceding the last instance of the attribute will be an error. - /// - /// This is the same as `ErrorFollowing`, except the last attribute is the - /// one that is "used". This is typically used in cases like codegen - /// attributes which usually only honor the last attribute. - ErrorPreceding, - /// Duplicates after the first attribute will be an unused_attribute warning - /// with a note that this will be an error in the future. - /// - /// This should be used for attributes that should be `ErrorFollowing`, but - /// because older versions of rustc silently accepted (and ignored) the - /// attributes, this is used to transition. - FutureWarnFollowing, - /// Duplicates preceding the last instance of the attribute will be a - /// warning, with a note that this will be an error in the future. - /// - /// This is the same as `FutureWarnFollowing`, except the last attribute is - /// the one that is "used". Ideally these can eventually migrate to - /// `ErrorPreceding`. - FutureWarnPreceding, -} - /// A convenience macro for constructing attribute templates. /// E.g., `template!(Word, List: "description")` means that the attribute /// supports forms `#[attr]` and `#[attr(description)]`. @@ -265,42 +213,39 @@ macro_rules! template { } macro_rules! ungated { - (unsafe($edition:ident) $attr:ident, $typ:expr, $duplicates:expr $(,)?) => { + (unsafe($edition:ident) $attr:ident, $typ:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: Some(Edition::$edition) }, gate: Ungated, - duplicates: $duplicates, } }; - (unsafe $attr:ident, $typ:expr, $duplicates:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, gate: Ungated, - duplicates: $duplicates, } }; - ($attr:ident, $typ:expr, $duplicates:expr $(,)?) => { + ($attr:ident, $typ:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Normal, gate: Ungated, - duplicates: $duplicates, } }; } macro_rules! gated { - (unsafe $attr:ident, $typ:expr, $duplicates:expr, $gate:ident, $message:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, - duplicates: $duplicates, + gate: Gated { feature: sym::$gate, message: $message, @@ -309,12 +254,12 @@ macro_rules! gated { }, } }; - (unsafe $attr:ident, $typ:expr, $duplicates:expr, $message:expr $(,)?) => { + (unsafe $attr:ident, $typ:expr, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, - duplicates: $duplicates, + gate: Gated { feature: sym::$attr, message: $message, @@ -323,12 +268,12 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $duplicates:expr, $gate:ident, $message:expr $(,)?) => { + ($attr:ident, $typ:expr, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Normal, - duplicates: $duplicates, + gate: Gated { feature: sym::$gate, message: $message, @@ -337,12 +282,12 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $duplicates:expr, $message:expr $(,)?) => { + ($attr:ident, $typ:expr, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Normal, - duplicates: $duplicates, + gate: Gated { feature: sym::$attr, message: $message, @@ -354,11 +299,10 @@ macro_rules! gated { } macro_rules! rustc_attr { - (TEST, $attr:ident, $typ:expr, $duplicate:expr $(,)?) => { + (TEST, $attr:ident, $typ:expr, $(,)?) => { rustc_attr!( $attr, $typ, - $duplicate, concat!( "the `#[", stringify!($attr), @@ -366,12 +310,12 @@ macro_rules! rustc_attr { ), ) }; - ($attr:ident, $typ:expr, $duplicates:expr, $($notes:expr),* $(,)?) => { + ($attr:ident, $typ:expr, $($notes:expr),* $(,)?) => { BuiltinAttribute { name: sym::$attr, type_: $typ, safety: AttributeSafety::Normal, - duplicates: $duplicates, + gate: Gated { feature: sym::rustc_attrs, message: "use of an internal attribute", @@ -397,7 +341,6 @@ pub struct BuiltinAttribute { pub name: Symbol, pub type_: AttributeType, pub safety: AttributeSafety, - pub duplicates: AttributeDuplicates, pub gate: AttributeGate, } @@ -411,243 +354,194 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Conditional compilation: ungated!( cfg, Normal, - DuplicatesOk, - ), + ), ungated!( cfg_attr, Normal, - DuplicatesOk, - ), + ), // Testing: ungated!( ignore, Normal, - WarnFollowing, - ), + ), ungated!( should_panic, Normal, - FutureWarnFollowing, ), // Macros: ungated!( automatically_derived, Normal, - WarnFollowing, - ), + ), ungated!( macro_use, Normal, - WarnFollowingWordOnly, ), - ungated!(macro_escape, Normal, WarnFollowing,), // Deprecated synonym for `macro_use`. + ungated!(macro_escape, Normal,), // Deprecated synonym for `macro_use`. ungated!( macro_export, Normal, - WarnFollowing, - ), + ), ungated!( proc_macro, Normal, - ErrorFollowing, - ), + ), ungated!( proc_macro_derive, Normal, - ErrorFollowing, - ), + ), ungated!( proc_macro_attribute, Normal, - ErrorFollowing, - ), + ), // Lints: ungated!( warn, Normal, - DuplicatesOk, - ), + ), ungated!( allow, Normal, - DuplicatesOk, - ), + ), ungated!( expect, Normal, - DuplicatesOk, - ), + ), ungated!( forbid, Normal, - DuplicatesOk, - ), + ), ungated!( deny, Normal, - DuplicatesOk, - ), + ), ungated!( must_use, Normal, - FutureWarnFollowing, ), gated!( - must_not_suspend, Normal, WarnFollowing, experimental!(must_not_suspend) + must_not_suspend, Normal, experimental!(must_not_suspend) ), ungated!( deprecated, Normal, - ErrorFollowing, - ), + ), // Crate properties: ungated!( crate_name, CrateLevel, - FutureWarnFollowing, ), ungated!( crate_type, CrateLevel, - DuplicatesOk, - ), + ), // ABI, linking, symbols, and FFI ungated!( link, Normal, - DuplicatesOk, - ), + ), ungated!( link_name, Normal, - FutureWarnPreceding, ), ungated!( no_link, Normal, - WarnFollowing, - ), + ), ungated!( repr, Normal, - DuplicatesOk, - ), + ), // FIXME(#82232, #143834): temporarily renamed to mitigate `#[align]` nameres ambiguity - gated!(rustc_align, Normal, DuplicatesOk, fn_align, experimental!(rustc_align)), - gated!(rustc_align_static, Normal, DuplicatesOk, static_align, experimental!(rustc_align_static)), + gated!(rustc_align, Normal,fn_align, experimental!(rustc_align)), + gated!(rustc_align_static, Normal,static_align, experimental!(rustc_align_static)), ungated!( unsafe(Edition2024) export_name, Normal, - FutureWarnPreceding, ), ungated!( unsafe(Edition2024) link_section, Normal, - FutureWarnPreceding, ), ungated!( unsafe(Edition2024) no_mangle, Normal, - WarnFollowing, - ), + ), ungated!( used, Normal, - WarnFollowing, - ), + ), ungated!( link_ordinal, Normal, - ErrorPreceding, ), ungated!( unsafe naked, Normal, - WarnFollowing, - ), + ), // See `TyAndLayout::pass_indirectly_in_non_rustic_abis` for details. rustc_attr!( - rustc_pass_indirectly_in_non_rustic_abis, Normal, ErrorFollowing, - "types marked with `#[rustc_pass_indirectly_in_non_rustic_abis]` are always passed indirectly by non-Rustic ABIs" + rustc_pass_indirectly_in_non_rustic_abis, Normal, "types marked with `#[rustc_pass_indirectly_in_non_rustic_abis]` are always passed indirectly by non-Rustic ABIs" ), // Limits: ungated!( recursion_limit, CrateLevel, - FutureWarnFollowing, ), ungated!( type_length_limit, CrateLevel, - FutureWarnFollowing, ), gated!( - move_size_limit, CrateLevel, ErrorFollowing, large_assignments, experimental!(move_size_limit) + move_size_limit, CrateLevel, large_assignments, experimental!(move_size_limit) ), // Entry point: ungated!( no_main, CrateLevel, - WarnFollowing, - ), + ), // Modules, prelude, and resolution: ungated!( path, Normal, - FutureWarnFollowing, ), ungated!( no_std, CrateLevel, - WarnFollowing, - ), + ), ungated!( no_implicit_prelude, Normal, - WarnFollowing, - ), + ), ungated!( non_exhaustive, Normal, - WarnFollowing, - ), + ), // Runtime ungated!( windows_subsystem, CrateLevel, - FutureWarnFollowing, ), ungated!( // RFC 2070 panic_handler, Normal, - WarnFollowing, - ), + ), // Code generation: ungated!( inline, Normal, - FutureWarnFollowing, ), ungated!( cold, Normal, - WarnFollowing, ), ungated!( no_builtins, CrateLevel, - WarnFollowing, - ), + ), ungated!( target_feature, Normal, - DuplicatesOk, - ), + ), ungated!( track_caller, Normal, - WarnFollowing, - ), + ), ungated!( instruction_set, Normal, - ErrorPreceding, ), gated!( unsafe force_target_feature, Normal, - DuplicatesOk, effective_target_features, experimental!(force_target_feature) + effective_target_features, experimental!(force_target_feature) ), gated!( - sanitize, Normal, ErrorPreceding, + sanitize, Normal, sanitize, experimental!(sanitize), ), gated!( coverage, Normal, - ErrorPreceding, coverage_attribute, experimental!(coverage) ), ungated!( doc, Normal, - DuplicatesOk, - ), + ), // Debugging ungated!( debugger_visualizer, Normal, - DuplicatesOk, - ), + ), ungated!( collapse_debuginfo, Normal, - ErrorFollowing, - ), + ), // ========================================================================== // Unstable attributes: @@ -655,61 +549,60 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Linking: gated!( - export_stable, Normal, WarnFollowing, experimental!(export_stable) + export_stable, Normal, experimental!(export_stable) ), // Testing: gated!( - test_runner, CrateLevel, ErrorFollowing, custom_test_frameworks, + test_runner, CrateLevel, custom_test_frameworks, "custom test frameworks are an unstable feature", ), gated!( - reexport_test_harness_main, CrateLevel, ErrorFollowing, custom_test_frameworks, + reexport_test_harness_main, CrateLevel, custom_test_frameworks, "custom test frameworks are an unstable feature", ), // RFC #1268 gated!( - marker, Normal, WarnFollowing,marker_trait_attr, experimental!(marker) + marker, Normal,marker_trait_attr, experimental!(marker) ), gated!( - thread_local, Normal, WarnFollowing,"`#[thread_local]` is an experimental feature, and does not currently handle destructors", + thread_local, Normal,"`#[thread_local]` is an experimental feature, and does not currently handle destructors", ), gated!( - no_core, CrateLevel, WarnFollowing, experimental!(no_core) + no_core, CrateLevel, experimental!(no_core) ), // RFC 2412 gated!( - optimize, Normal, ErrorPreceding, + optimize, Normal, optimize_attribute, experimental!(optimize) ), gated!( - unsafe ffi_pure, Normal, WarnFollowing, experimental!(ffi_pure) + unsafe ffi_pure, Normal, experimental!(ffi_pure) ), gated!( - unsafe ffi_const, Normal, WarnFollowing, experimental!(ffi_const) + unsafe ffi_const, Normal, experimental!(ffi_const) ), gated!( - register_tool, CrateLevel, DuplicatesOk, - experimental!(register_tool), + register_tool, CrateLevel, experimental!(register_tool), ), // `#[cfi_encoding = ""]` gated!( - cfi_encoding, Normal, ErrorPreceding, + cfi_encoding, Normal, experimental!(cfi_encoding) ), // `#[coroutine]` attribute to be applied to closures to make them coroutines instead gated!( - coroutine, Normal, ErrorFollowing, coroutines, experimental!(coroutine) + coroutine, Normal,coroutines, experimental!(coroutine) ), // RFC 3543 // `#[patchable_function_entry(prefix_nops = m, entry_nops = n)]` gated!( - patchable_function_entry, Normal, ErrorPreceding, + patchable_function_entry, Normal, experimental!(patchable_function_entry) ), @@ -718,10 +611,10 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/132306 gated!( - const_continue, Normal, ErrorFollowing, loop_match, experimental!(const_continue) + const_continue, Normal,loop_match, experimental!(const_continue) ), gated!( - loop_match, Normal, ErrorFollowing, loop_match, experimental!(loop_match) + loop_match, Normal,loop_match, experimental!(loop_match) ), // The `#[pin_v2]` attribute is part of the `pin_ergonomics` experiment @@ -729,7 +622,7 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/130494 gated!( - pin_v2, Normal, ErrorFollowing, pin_ergonomics, experimental!(pin_v2), + pin_v2, Normal,pin_ergonomics, experimental!(pin_v2), ), // ========================================================================== @@ -738,58 +631,48 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ ungated!( feature, CrateLevel, - DuplicatesOk, - ), + ), // DuplicatesOk since it has its own validation ungated!( stable, Normal, - DuplicatesOk, - ), + ), ungated!( unstable, Normal, - DuplicatesOk, - ), + ), ungated!( unstable_feature_bound, Normal, - DuplicatesOk, - ), + ), ungated!( rustc_const_unstable, Normal, - DuplicatesOk, - ), + ), ungated!( rustc_const_stable, Normal, - DuplicatesOk, - ), + ), ungated!( rustc_default_body_unstable, Normal, - DuplicatesOk, - ), + ), gated!( allow_internal_unstable, Normal, - DuplicatesOk, - "allow_internal_unstable side-steps feature gating and stability checks", + "allow_internal_unstable side-steps feature gating and stability checks", ), gated!( - allow_internal_unsafe, Normal, WarnFollowing, "allow_internal_unsafe side-steps the unsafe_code lint", + allow_internal_unsafe, Normal, "allow_internal_unsafe side-steps the unsafe_code lint", ), gated!( rustc_eii_foreign_item, Normal, - ErrorFollowing, eii_internals, + eii_internals, "used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), rustc_attr!( rustc_allowed_through_unstable_modules, Normal, - WarnFollowing,"rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \ + "rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \ through unstable paths" ), rustc_attr!( - rustc_deprecated_safe_2024, Normal, - ErrorFollowing,"`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", + rustc_deprecated_safe_2024, Normal,"`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", ), rustc_attr!( - rustc_pub_transparent, Normal, - ErrorFollowing,"used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", + rustc_pub_transparent, Normal,"used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), @@ -797,17 +680,16 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes: Type system related: // ========================================================================== - gated!(fundamental, Normal, WarnFollowing, experimental!(fundamental)), + gated!(fundamental, Normal, experimental!(fundamental)), gated!( - may_dangle, Normal, WarnFollowing, dropck_eyepatch, + may_dangle, Normal, dropck_eyepatch, "`may_dangle` has unstable semantics and may be removed in the future", ), rustc_attr!( rustc_never_type_options, Normal, - ErrorFollowing, - "`rustc_never_type_options` is used to experiment with never type fallback and work on \ + "`rustc_never_type_options` is used to experiment with never type fallback and work on \ never type stabilization" ), @@ -816,42 +698,42 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== rustc_attr!( - rustc_allocator, Normal, WarnFollowing, + rustc_allocator, Normal, ), rustc_attr!( - rustc_nounwind, Normal, WarnFollowing, + rustc_nounwind, Normal, ), rustc_attr!( - rustc_reallocator, Normal, WarnFollowing, + rustc_reallocator, Normal, ), rustc_attr!( - rustc_deallocator, Normal, WarnFollowing, + rustc_deallocator, Normal, ), rustc_attr!( - rustc_allocator_zeroed, Normal, WarnFollowing, + rustc_allocator_zeroed, Normal, ), rustc_attr!( - rustc_allocator_zeroed_variant, Normal, ErrorPreceding, + rustc_allocator_zeroed_variant, Normal, ), gated!( - default_lib_allocator, Normal, WarnFollowing, allocator_internals, experimental!(default_lib_allocator), + default_lib_allocator, Normal, allocator_internals, experimental!(default_lib_allocator), ), gated!( - needs_allocator, Normal, WarnFollowing, allocator_internals, experimental!(needs_allocator), + needs_allocator, Normal, allocator_internals, experimental!(needs_allocator), ), gated!( - panic_runtime, CrateLevel, WarnFollowing, experimental!(panic_runtime) + panic_runtime, CrateLevel, experimental!(panic_runtime) ), gated!( - needs_panic_runtime, CrateLevel, WarnFollowing, experimental!(needs_panic_runtime) + needs_panic_runtime, CrateLevel, experimental!(needs_panic_runtime) ), gated!( - compiler_builtins, CrateLevel, WarnFollowing, + compiler_builtins, CrateLevel, "the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate \ which contains compiler-rt intrinsics and will never be stable", ), gated!( - profiler_runtime, CrateLevel, WarnFollowing, + profiler_runtime, CrateLevel, "the `#[profiler_runtime]` attribute is used to identify the `profiler_builtins` crate \ which contains the profiler runtime and will never be stable", ), @@ -862,17 +744,16 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ gated!( linkage, Normal, - ErrorPreceding, "the `linkage` attribute is experimental and not portable across platforms", ), rustc_attr!( - rustc_std_internal_symbol, Normal, WarnFollowing, + rustc_std_internal_symbol, Normal, ), rustc_attr!( - rustc_objc_class, Normal, ErrorPreceding, + rustc_objc_class, Normal, ), rustc_attr!( - rustc_objc_selector, Normal, ErrorPreceding, + rustc_objc_selector, Normal, ), // ========================================================================== @@ -881,32 +762,29 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ rustc_attr!( rustc_builtin_macro, Normal, - ErrorFollowing, - ), + ), rustc_attr!( - rustc_proc_macro_decls, Normal, WarnFollowing, + rustc_proc_macro_decls, Normal, ), rustc_attr!( rustc_macro_transparency, Normal, - ErrorFollowing, "used internally for testing macro hygiene", + "used internally for testing macro hygiene", ), rustc_attr!( rustc_autodiff, Normal, - DuplicatesOk, - ), + ), rustc_attr!( rustc_offload_kernel, Normal, - DuplicatesOk, - ), + ), // Traces that are left when `cfg` and `cfg_attr` attributes are expanded. // The attributes are not gated, to avoid stability errors, but they cannot be used in stable // or unstable code directly because `sym::cfg_(attr_)trace` are not valid identifiers, they // can only be generated by the compiler. ungated!( - cfg_trace, Normal, DuplicatesOk + cfg_trace, Normal ), ungated!( - cfg_attr_trace, Normal, DuplicatesOk + cfg_attr_trace, Normal ), // ========================================================================== @@ -914,74 +792,64 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== rustc_attr!( - rustc_on_unimplemented, Normal, - ErrorFollowing,"see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" + rustc_on_unimplemented, Normal,"see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" ), rustc_attr!( rustc_confusables, Normal, - ErrorFollowing, - ), + ), // Enumerates "identity-like" conversion methods to suggest on type mismatch. rustc_attr!( rustc_conversion_suggestion, Normal, - WarnFollowing, - ), + ), // Prevents field reads in the marked trait or method to be considered // during dead code analysis. rustc_attr!( rustc_trivial_field_reads, Normal, - WarnFollowing, - ), + ), // Used by the `rustc::potential_query_instability` lint to warn methods which // might not be stable during incremental compilation. rustc_attr!( rustc_lint_query_instability, Normal, - WarnFollowing, - ), + ), // Used by the `rustc::untracked_query_information` lint to warn methods which // might not be stable during incremental compilation. rustc_attr!( rustc_lint_untracked_query_information, Normal, - WarnFollowing, - ), + ), // Used by the `rustc::bad_opt_access` lint to identify `DebuggingOptions` and `CodegenOptions` // types (as well as any others in future). rustc_attr!( rustc_lint_opt_ty, Normal, - WarnFollowing, - ), + ), // Used by the `rustc::bad_opt_access` lint on fields // types (as well as any others in future). rustc_attr!( rustc_lint_opt_deny_field_access, Normal, - WarnFollowing, - ), + ), // ========================================================================== // Internal attributes, Const related: // ========================================================================== rustc_attr!( - rustc_promotable, Normal, WarnFollowing, ), + rustc_promotable, Normal, ), rustc_attr!( - rustc_legacy_const_generics, Normal, ErrorFollowing, - ), + rustc_legacy_const_generics, Normal, ), // Do not const-check this function's body. It will always get replaced during CTFE via `hook_special_const_fn`. rustc_attr!( - rustc_do_not_const_check, Normal, WarnFollowing, "`#[rustc_do_not_const_check]` skips const-check for this function's body", + rustc_do_not_const_check, Normal, "`#[rustc_do_not_const_check]` skips const-check for this function's body", ), rustc_attr!( rustc_const_stable_indirect, Normal, - WarnFollowing,"this is an internal implementation detail", + "this is an internal implementation detail", ), rustc_attr!( rustc_intrinsic_const_stable_indirect, Normal, - WarnFollowing, "this is an internal implementation detail", + "this is an internal implementation detail", ), rustc_attr!( rustc_allow_const_fn_unstable, Normal, - DuplicatesOk, - "rustc_allow_const_fn_unstable side-steps feature gating and stability checks" + "rustc_allow_const_fn_unstable side-steps feature gating and stability checks" ), // ========================================================================== @@ -989,22 +857,19 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== rustc_attr!( - rustc_layout_scalar_valid_range_start, Normal, ErrorFollowing, - "the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \ + rustc_layout_scalar_valid_range_start, Normal, "the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \ niche optimizations in the standard library", ), rustc_attr!( - rustc_layout_scalar_valid_range_end, Normal, ErrorFollowing, - "the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \ + rustc_layout_scalar_valid_range_end, Normal, "the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \ niche optimizations in the standard library", ), rustc_attr!( - rustc_simd_monomorphize_lane_limit, Normal, ErrorFollowing, - "the `#[rustc_simd_monomorphize_lane_limit]` attribute is just used by std::simd \ + rustc_simd_monomorphize_lane_limit, Normal, "the `#[rustc_simd_monomorphize_lane_limit]` attribute is just used by std::simd \ for better error messages", ), rustc_attr!( - rustc_nonnull_optimization_guaranteed, Normal, WarnFollowing, + rustc_nonnull_optimization_guaranteed, Normal, "the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to document \ guaranteed niche optimizations in the standard library", "the compiler does not even check whether the type indeed is being non-null-optimized; \ @@ -1015,59 +880,51 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes, Misc: // ========================================================================== gated!( - lang, Normal, DuplicatesOk, lang_items, + lang, Normal,lang_items, "lang items are subject to change", ), rustc_attr!( - rustc_as_ptr, Normal, ErrorFollowing, - "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations" + rustc_as_ptr, Normal, "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations" ), rustc_attr!( - rustc_should_not_be_called_on_const_items, Normal, ErrorFollowing, - "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts" + rustc_should_not_be_called_on_const_items, Normal, "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts" ), rustc_attr!( - rustc_pass_by_value, Normal, ErrorFollowing, - "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference" + rustc_pass_by_value, Normal, "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference" ), rustc_attr!( - rustc_never_returns_null_ptr, Normal, ErrorFollowing, - "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers" + rustc_never_returns_null_ptr, Normal, "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers" ), rustc_attr!( - rustc_no_implicit_autorefs, AttributeType::Normal, ErrorFollowing,"`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" + rustc_no_implicit_autorefs, AttributeType::Normal, "`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" ), rustc_attr!( - rustc_coherence_is_core, AttributeType::CrateLevel, ErrorFollowing,"`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" + rustc_coherence_is_core, AttributeType::CrateLevel, "`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" ), rustc_attr!( - rustc_coinductive, AttributeType::Normal, WarnFollowing,"`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" + rustc_coinductive, AttributeType::Normal,"`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" ), rustc_attr!( - rustc_allow_incoherent_impl, AttributeType::Normal, ErrorFollowing,"`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" + rustc_allow_incoherent_impl, AttributeType::Normal, "`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" ), rustc_attr!( - rustc_preserve_ub_checks, AttributeType::CrateLevel, ErrorFollowing,"`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR", + rustc_preserve_ub_checks, AttributeType::CrateLevel, "`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR", ), rustc_attr!( rustc_deny_explicit_impl, - AttributeType::Normal, - ErrorFollowing,"`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" + AttributeType::Normal,"`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" ), rustc_attr!( rustc_dyn_incompatible_trait, - AttributeType::Normal, - ErrorFollowing,"`#[rustc_dyn_incompatible_trait]` marks a trait as dyn-incompatible, \ + AttributeType::Normal,"`#[rustc_dyn_incompatible_trait]` marks a trait as dyn-incompatible, \ even if it otherwise satisfies the requirements to be dyn-compatible." ), rustc_attr!( - rustc_has_incoherent_inherent_impls, AttributeType::Normal, - ErrorFollowing,"`#[rustc_has_incoherent_inherent_impls]` allows the addition of incoherent inherent impls for \ + rustc_has_incoherent_inherent_impls, AttributeType::Normal,"`#[rustc_has_incoherent_inherent_impls]` allows the addition of incoherent inherent impls for \ the given type by annotating all impl items with `#[rustc_allow_incoherent_impl]`" ), rustc_attr!( - rustc_non_const_trait_method, AttributeType::Normal, - ErrorFollowing,"`#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods \ + rustc_non_const_trait_method, AttributeType::Normal,"`#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods \ as non-const to allow large traits an easier transition to const" ), @@ -1075,7 +932,7 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ name: sym::rustc_diagnostic_item, type_: Normal, safety: AttributeSafety::Normal, - duplicates: ErrorFollowing,gate: Gated { + gate: Gated { feature: sym::rustc_attrs, message: "use of an internal attribute", check: Features::rustc_attrs, @@ -1085,205 +942,160 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ }, gated!( // Used in resolve: - prelude_import, Normal, WarnFollowing, "`#[prelude_import]` is for use by rustc only", + prelude_import, Normal, "`#[prelude_import]` is for use by rustc only", ), gated!( - rustc_paren_sugar, Normal, WarnFollowing,unboxed_closures, "unboxed_closures are still evolving", + rustc_paren_sugar, Normal,unboxed_closures, "unboxed_closures are still evolving", ), rustc_attr!( - rustc_inherit_overflow_checks, Normal, WarnFollowing,"the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ + rustc_inherit_overflow_checks, Normal,"the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ overflow checking behavior of several functions in the standard library that are inlined \ across crates", ), rustc_attr!( - rustc_reservation_impl, Normal, - ErrorFollowing,"the `#[rustc_reservation_impl]` attribute is internally used \ + rustc_reservation_impl, Normal,"the `#[rustc_reservation_impl]` attribute is internally used \ for reserving `impl From for T` as part of the effort to stabilize `!`" ), rustc_attr!( - rustc_test_marker, Normal, WarnFollowing, "the `#[rustc_test_marker]` attribute is used internally to track tests", + rustc_test_marker, Normal, "the `#[rustc_test_marker]` attribute is used internally to track tests", ), rustc_attr!( rustc_unsafe_specialization_marker, Normal, - WarnFollowing,"the `#[rustc_unsafe_specialization_marker]` attribute is used to check specializations" + "the `#[rustc_unsafe_specialization_marker]` attribute is used to check specializations" ), rustc_attr!( rustc_specialization_trait, Normal, - WarnFollowing,"the `#[rustc_specialization_trait]` attribute is used to check specializations" + "the `#[rustc_specialization_trait]` attribute is used to check specializations" ), rustc_attr!( - rustc_main, Normal, WarnFollowing,"the `#[rustc_main]` attribute is used internally to specify test entry point function", + rustc_main, Normal,"the `#[rustc_main]` attribute is used internally to specify test entry point function", ), rustc_attr!( - rustc_skip_during_method_dispatch, Normal, ErrorFollowing, - "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ + rustc_skip_during_method_dispatch, Normal, "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ from method dispatch when the receiver is of the following type, for compatibility in \ editions < 2021 (array) or editions < 2024 (boxed_slice)" ), rustc_attr!( - rustc_must_implement_one_of, Normal, - ErrorFollowing,"the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ + rustc_must_implement_one_of, Normal,"the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ definition of a trait. Its syntax and semantics are highly experimental and will be \ subject to change before stabilization", ), rustc_attr!( - rustc_doc_primitive, Normal, ErrorFollowing, "the `#[rustc_doc_primitive]` attribute is used by the standard library \ + rustc_doc_primitive, Normal,"the `#[rustc_doc_primitive]` attribute is used by the standard library \ to provide a way to generate documentation for primitive types", ), gated!( - rustc_intrinsic, Normal, ErrorFollowing, intrinsics, + rustc_intrinsic, Normal,intrinsics, "the `#[rustc_intrinsic]` attribute is used to declare intrinsics as function items", ), rustc_attr!( - rustc_no_mir_inline, Normal, WarnFollowing,"`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" + rustc_no_mir_inline, Normal,"`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" ), rustc_attr!( - rustc_force_inline, Normal, WarnFollowing,"`#[rustc_force_inline]` forces a free function to be inlined" + rustc_force_inline, Normal,"`#[rustc_force_inline]` forces a free function to be inlined" ), rustc_attr!( - rustc_scalable_vector, Normal, WarnFollowing,"`#[rustc_scalable_vector]` defines a scalable vector type" + rustc_scalable_vector, Normal,"`#[rustc_scalable_vector]` defines a scalable vector type" ), // ========================================================================== // Internal attributes, Testing: // ========================================================================== - rustc_attr!(TEST, rustc_effective_visibility, Normal, WarnFollowing,), + rustc_attr!(TEST, rustc_effective_visibility, Normal,), rustc_attr!( TEST, rustc_dump_inferred_outlives, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_capture_analysis, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_insignificant_dtor, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_no_implicit_bounds, CrateLevel, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_strict_coherence, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_dump_variances, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_dump_variances_of_opaques, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_hidden_type_of_opaques, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_layout, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_abi, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_regions, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_delayed_bug_from_inside_query, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_dump_user_args, Normal, - WarnFollowing, - ), + ), rustc_attr!( - TEST, rustc_evaluate_where_clauses, Normal, WarnFollowing, + TEST, rustc_evaluate_where_clauses, Normal, ), rustc_attr!( - TEST, rustc_if_this_changed, Normal, DuplicatesOk, - ), + TEST, rustc_if_this_changed, Normal, ), rustc_attr!( - TEST, rustc_then_this_would_need, Normal, DuplicatesOk, - ), + TEST, rustc_then_this_would_need, Normal, ), rustc_attr!( TEST, rustc_clean, Normal, - DuplicatesOk, - ), + ), rustc_attr!( TEST, rustc_partition_reused, Normal, - DuplicatesOk, - ), + ), rustc_attr!( TEST, rustc_partition_codegened, Normal, - DuplicatesOk, - ), + ), rustc_attr!( TEST, rustc_expected_cgu_reuse, Normal, - DuplicatesOk, - ), + ), rustc_attr!( TEST, rustc_symbol_name, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_def_path, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_mir, Normal, - DuplicatesOk, - ), + ), gated!( - custom_mir, Normal, - ErrorFollowing,"the `#[custom_mir]` attribute is just used for the Rust test suite", + custom_mir, Normal,"the `#[custom_mir]` attribute is just used for the Rust test suite", ), rustc_attr!( TEST, rustc_dump_item_bounds, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_dump_predicates, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_dump_def_parents, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_dump_object_lifetime_defaults, Normal, - WarnFollowing, - ), + ), rustc_attr!( TEST, rustc_dump_vtable, Normal, - WarnFollowing, - ), - rustc_attr!( - TEST, rustc_dummy, Normal, - DuplicatesOk, - ), - rustc_attr!( - TEST, pattern_complexity_limit, CrateLevel, - ErrorFollowing, - ), + ), + rustc_attr!(TEST, rustc_dummy, Normal,), + rustc_attr!(TEST, pattern_complexity_limit, CrateLevel, ), ]; pub fn is_builtin_attr_name(name: Symbol) -> bool { BUILTIN_ATTRIBUTE_MAP.get(&name).is_some() } -pub fn is_valid_for_get_attr(name: Symbol) -> bool { - BUILTIN_ATTRIBUTE_MAP.get(&name).is_some_and(|attr| match attr.duplicates { - WarnFollowing | ErrorFollowing | ErrorPreceding | FutureWarnFollowing - | FutureWarnPreceding => true, - DuplicatesOk | WarnFollowingWordOnly => false, - }) -} - pub static BUILTIN_ATTRIBUTE_MAP: LazyLock> = LazyLock::new(|| { let mut map = FxHashMap::default(); diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs index 3a5b153d6be30..db37e4534df9d 100644 --- a/compiler/rustc_feature/src/lib.rs +++ b/compiler/rustc_feature/src/lib.rs @@ -129,9 +129,9 @@ pub fn find_feature_issue(feature: Symbol, issue: GateIssue) -> Option TyCtxt<'tcx> { #[deprecated = "Though there are valid usecases for this method, especially when your attribute is not a parsed attribute, usually you want to call rustc_hir::find_attr! instead."] pub fn get_attr(self, did: impl Into, attr: Symbol) -> Option<&'tcx hir::Attribute> { - if cfg!(debug_assertions) && !rustc_feature::is_valid_for_get_attr(attr) { - let did: DefId = did.into(); - bug!("get_attr: unexpected called with DefId `{:?}`, attr `{:?}`", did, attr); - } else { - #[allow(deprecated)] - self.get_attrs(did, attr).next() - } + #[allow(deprecated)] + self.get_attrs(did, attr).next() } /// Determines whether an item is annotated with an attribute. diff --git a/compiler/rustc_passes/src/check_attr.rs b/compiler/rustc_passes/src/check_attr.rs index 12b583d8fee15..4dca461f8aa56 100644 --- a/compiler/rustc_passes/src/check_attr.rs +++ b/compiler/rustc_passes/src/check_attr.rs @@ -6,17 +6,15 @@ //! item. use std::cell::Cell; -use std::collections::hash_map::Entry; use std::slice; use rustc_abi::ExternAbi; use rustc_ast::ast; use rustc_attr_parsing::{AttributeParser, Late}; -use rustc_data_structures::fx::FxHashMap; use rustc_data_structures::thin_vec::ThinVec; use rustc_data_structures::unord::UnordMap; use rustc_errors::{DiagCtxtHandle, IntoDiagArg, MultiSpan, msg}; -use rustc_feature::{AttributeDuplicates, AttributeType, BUILTIN_ATTRIBUTE_MAP, BuiltinAttribute}; +use rustc_feature::{AttributeType, BUILTIN_ATTRIBUTE_MAP, BuiltinAttribute}; use rustc_hir::attrs::diagnostic::Directive; use rustc_hir::attrs::{ AttributeKind, CrateType, DocAttribute, DocInline, EiiDecl, EiiImpl, EiiImplResolution, @@ -137,7 +135,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> { target: Target, item: Option>, ) { - let mut seen = FxHashMap::default(); let attrs = self.tcx.hir_attrs(hir_id); for attr in attrs { match attr { @@ -449,19 +446,6 @@ impl<'tcx> CheckAttrVisitor<'tcx> { } } - if let Attribute::Unparsed(unparsed_attr) = attr - && let Some(BuiltinAttribute { duplicates, .. }) = - attr.name().and_then(|name| BUILTIN_ATTRIBUTE_MAP.get(&name)) - { - check_duplicates( - self.tcx, - unparsed_attr.span, - attr, - hir_id, - *duplicates, - &mut seen, - ); - } self.check_unused_attribute(hir_id, attr) } @@ -1994,67 +1978,6 @@ pub(crate) fn provide(providers: &mut Providers) { *providers = Providers { check_mod_attrs, ..*providers }; } -// FIXME(jdonszelmann): remove, check during parsing -fn check_duplicates( - tcx: TyCtxt<'_>, - attr_span: Span, - attr: &Attribute, - hir_id: HirId, - duplicates: AttributeDuplicates, - seen: &mut FxHashMap, -) { - use AttributeDuplicates::*; - if matches!(duplicates, WarnFollowingWordOnly) && !attr.is_word() { - return; - } - let attr_name = attr.name().unwrap(); - match duplicates { - DuplicatesOk => {} - WarnFollowing | FutureWarnFollowing | WarnFollowingWordOnly | FutureWarnPreceding => { - match seen.entry(attr_name) { - Entry::Occupied(mut entry) => { - let (this, other) = if matches!(duplicates, FutureWarnPreceding) { - let to_remove = entry.insert(attr_span); - (to_remove, attr_span) - } else { - (attr_span, *entry.get()) - }; - tcx.emit_node_span_lint( - UNUSED_ATTRIBUTES, - hir_id, - this, - errors::UnusedDuplicate { - this, - other, - warning: matches!( - duplicates, - FutureWarnFollowing | FutureWarnPreceding - ), - }, - ); - } - Entry::Vacant(entry) => { - entry.insert(attr_span); - } - } - } - ErrorFollowing | ErrorPreceding => match seen.entry(attr_name) { - Entry::Occupied(mut entry) => { - let (this, other) = if matches!(duplicates, ErrorPreceding) { - let to_remove = entry.insert(attr_span); - (to_remove, attr_span) - } else { - (attr_span, *entry.get()) - }; - tcx.dcx().emit_err(errors::UnusedMultiple { this, other, name: attr_name }); - } - Entry::Vacant(entry) => { - entry.insert(attr_span); - } - }, - } -} - fn doc_fake_variadic_is_allowed_self_ty(self_ty: &hir::Ty<'_>) -> bool { matches!(&self_ty.kind, hir::TyKind::Tup([_])) || if let hir::TyKind::FnPtr(fn_ptr_ty) = &self_ty.kind { diff --git a/compiler/rustc_passes/src/errors.rs b/compiler/rustc_passes/src/errors.rs index 628d0b0c961a1..46b96ff1da353 100644 --- a/compiler/rustc_passes/src/errors.rs +++ b/compiler/rustc_passes/src/errors.rs @@ -326,30 +326,6 @@ pub(crate) struct InvalidMayDangle { pub attr_span: Span, } -#[derive(Diagnostic)] -#[diag("unused attribute")] -pub(crate) struct UnusedDuplicate { - #[suggestion("remove this attribute", code = "", applicability = "machine-applicable")] - pub this: Span, - #[note("attribute also specified here")] - pub other: Span, - #[warning( - "this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!" - )] - pub warning: bool, -} - -#[derive(Diagnostic)] -#[diag("multiple `{$name}` attributes")] -pub(crate) struct UnusedMultiple { - #[primary_span] - #[suggestion("remove this attribute", code = "", applicability = "machine-applicable")] - pub this: Span, - #[note("attribute also specified here")] - pub other: Span, - pub name: Symbol, -} - #[derive(Diagnostic)] #[diag("this `#[deprecated]` annotation has no effect")] pub(crate) struct DeprecatedAnnotationHasNoEffect { From 9058b5fce2e0390fdb00d69c6aeeb0242d70d741 Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Sat, 4 Apr 2026 13:54:20 +0200 Subject: [PATCH 6/9] Remove AttributeType from BUILTIN_ATTRIBUTES --- compiler/rustc_feature/src/builtin_attrs.rs | 751 ++++++-------------- compiler/rustc_feature/src/lib.rs | 6 +- compiler/rustc_passes/src/check_attr.rs | 47 +- 3 files changed, 228 insertions(+), 576 deletions(-) diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs index 3e8e71c2d6834..db29b19b78cfd 100644 --- a/compiler/rustc_feature/src/builtin_attrs.rs +++ b/compiler/rustc_feature/src/builtin_attrs.rs @@ -3,7 +3,6 @@ use std::sync::LazyLock; use AttributeGate::*; -use AttributeType::*; use rustc_data_structures::fx::FxHashMap; use rustc_hir::AttrStyle; use rustc_span::edition::Edition; @@ -71,15 +70,6 @@ pub fn find_gated_cfg(pred: impl Fn(Symbol) -> bool) -> Option<&'static GatedCfg // move that documentation into the relevant place in the other docs, and // remove the chapter on the flag. -#[derive(Copy, Clone, PartialEq, Debug)] -pub enum AttributeType { - /// Normal,builtin attribute that is consumed - /// by the compiler before the unused_attribute check - Normal, - /// Builtin attribute that is only allowed at the crate level - CrateLevel, -} - #[derive(Copy, Clone, PartialEq, Debug)] pub enum AttributeSafety { /// Normal attribute that does not need `#[unsafe(...)]` @@ -213,37 +203,29 @@ macro_rules! template { } macro_rules! ungated { - (unsafe($edition:ident) $attr:ident, $typ:expr $(,)?) => { + (unsafe($edition:ident) $attr:ident $(,)?) => { BuiltinAttribute { name: sym::$attr, - type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: Some(Edition::$edition) }, gate: Ungated, } }; - (unsafe $attr:ident, $typ:expr $(,)?) => { + (unsafe $attr:ident $(,)?) => { BuiltinAttribute { name: sym::$attr, - type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, gate: Ungated, } }; - ($attr:ident, $typ:expr $(,)?) => { - BuiltinAttribute { - name: sym::$attr, - type_: $typ, - safety: AttributeSafety::Normal, - gate: Ungated, - } + ($attr:ident $(,)?) => { + BuiltinAttribute { name: sym::$attr, safety: AttributeSafety::Normal, gate: Ungated } }; } macro_rules! gated { - (unsafe $attr:ident, $typ:expr, $gate:ident, $message:expr $(,)?) => { + (unsafe $attr:ident, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, gate: Gated { @@ -254,10 +236,9 @@ macro_rules! gated { }, } }; - (unsafe $attr:ident, $typ:expr, $message:expr $(,)?) => { + (unsafe $attr:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - type_: $typ, safety: AttributeSafety::Unsafe { unsafe_since: None }, gate: Gated { @@ -268,10 +249,9 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $gate:ident, $message:expr $(,)?) => { + ($attr:ident, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - type_: $typ, safety: AttributeSafety::Normal, gate: Gated { @@ -282,10 +262,9 @@ macro_rules! gated { }, } }; - ($attr:ident, $typ:expr, $message:expr $(,)?) => { + ($attr:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - type_: $typ, safety: AttributeSafety::Normal, gate: Gated { @@ -299,10 +278,8 @@ macro_rules! gated { } macro_rules! rustc_attr { - (TEST, $attr:ident, $typ:expr, $(,)?) => { - rustc_attr!( - $attr, - $typ, + (TEST, $attr:ident, $(,)?) => { + rustc_attr!( $attr, concat!( "the `#[", stringify!($attr), @@ -310,12 +287,10 @@ macro_rules! rustc_attr { ), ) }; - ($attr:ident, $typ:expr, $($notes:expr),* $(,)?) => { + ($attr:ident, $($notes:expr),* $(,)?) => { BuiltinAttribute { name: sym::$attr, - type_: $typ, safety: AttributeSafety::Normal, - gate: Gated { feature: sym::rustc_attrs, message: "use of an internal attribute", @@ -339,7 +314,6 @@ macro_rules! experimental { pub struct BuiltinAttribute { pub name: Symbol, - pub type_: AttributeType, pub safety: AttributeSafety, pub gate: AttributeGate, } @@ -352,196 +326,98 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== // Conditional compilation: - ungated!( - cfg, Normal, - ), - ungated!( - cfg_attr, Normal, - ), + ungated!(cfg,), + ungated!(cfg_attr,), // Testing: - ungated!( - ignore, Normal, - ), - ungated!( - should_panic, Normal, - ), + ungated!(ignore,), + ungated!(should_panic,), // Macros: - ungated!( - automatically_derived, Normal, - ), - ungated!( - macro_use, Normal, - ), - ungated!(macro_escape, Normal,), // Deprecated synonym for `macro_use`. - ungated!( - macro_export, Normal, - ), - ungated!( - proc_macro, Normal, - ), - ungated!( - proc_macro_derive, Normal, - ), - ungated!( - proc_macro_attribute, Normal, - ), + ungated!(automatically_derived,), + ungated!(macro_use,), + ungated!(macro_escape,), // Deprecated synonym for `macro_use`. + ungated!(macro_export,), + ungated!(proc_macro,), + ungated!(proc_macro_derive,), + ungated!(proc_macro_attribute,), // Lints: - ungated!( - warn, Normal, - ), - ungated!( - allow, Normal, - ), - ungated!( - expect, Normal, - ), - ungated!( - forbid, Normal, - ), - ungated!( - deny, Normal, - ), - ungated!( - must_use, Normal, - ), - gated!( - must_not_suspend, Normal, experimental!(must_not_suspend) - ), - ungated!( - deprecated, Normal, - ), + ungated!(warn,), + ungated!(allow,), + ungated!(expect,), + ungated!(forbid,), + ungated!(deny,), + ungated!(must_use,), + gated!(must_not_suspend, experimental!(must_not_suspend)), + ungated!(deprecated,), // Crate properties: - ungated!( - crate_name, CrateLevel, - ), - ungated!( - crate_type, CrateLevel, - ), + ungated!(crate_name,), + ungated!(crate_type,), // ABI, linking, symbols, and FFI - ungated!( - link, Normal, - ), - ungated!( - link_name, Normal, - ), - ungated!( - no_link, Normal, - ), - ungated!( - repr, Normal, - ), + ungated!(link,), + ungated!(link_name,), + ungated!(no_link,), + ungated!(repr,), // FIXME(#82232, #143834): temporarily renamed to mitigate `#[align]` nameres ambiguity - gated!(rustc_align, Normal,fn_align, experimental!(rustc_align)), - gated!(rustc_align_static, Normal,static_align, experimental!(rustc_align_static)), - ungated!( - unsafe(Edition2024) export_name, Normal, - ), - ungated!( - unsafe(Edition2024) link_section, Normal, - ), - ungated!( - unsafe(Edition2024) no_mangle, Normal, - ), - ungated!( - used, Normal, - ), - ungated!( - link_ordinal, Normal, - ), - ungated!( - unsafe naked, Normal, - ), + gated!(rustc_align,fn_align, experimental!(rustc_align)), + gated!(rustc_align_static,static_align, experimental!(rustc_align_static)), + ungated!(unsafe(Edition2024) export_name,), + ungated!(unsafe(Edition2024) link_section,), + ungated!(unsafe(Edition2024) no_mangle,), + ungated!(used,), + ungated!(link_ordinal,), + ungated!(unsafe naked,), // See `TyAndLayout::pass_indirectly_in_non_rustic_abis` for details. - rustc_attr!( - rustc_pass_indirectly_in_non_rustic_abis, Normal, "types marked with `#[rustc_pass_indirectly_in_non_rustic_abis]` are always passed indirectly by non-Rustic ABIs" - ), + rustc_attr!(rustc_pass_indirectly_in_non_rustic_abis, "types marked with `#[rustc_pass_indirectly_in_non_rustic_abis]` are always passed indirectly by non-Rustic ABIs"), // Limits: - ungated!( - recursion_limit, CrateLevel, - ), - ungated!( - type_length_limit, CrateLevel, - ), + ungated!(recursion_limit,), + ungated!(type_length_limit,), gated!( - move_size_limit, CrateLevel, large_assignments, experimental!(move_size_limit) + move_size_limit, large_assignments, experimental!(move_size_limit) ), // Entry point: - ungated!( - no_main, CrateLevel, - ), + ungated!(no_main,), // Modules, prelude, and resolution: - ungated!( - path, Normal, - ), - ungated!( - no_std, CrateLevel, - ), - ungated!( - no_implicit_prelude, Normal, - ), - ungated!( - non_exhaustive, Normal, - ), + ungated!(path,), + ungated!(no_std,), + ungated!(no_implicit_prelude,), + ungated!(non_exhaustive,), // Runtime - ungated!( - windows_subsystem, CrateLevel, - ), - ungated!( // RFC 2070 - panic_handler, Normal, - ), + ungated!(windows_subsystem,), + ungated!(// RFC 2070 + panic_handler,), // Code generation: - ungated!( - inline, Normal, - ), - ungated!( - cold, Normal, - ), - ungated!( - no_builtins, CrateLevel, - ), - ungated!( - target_feature, Normal, - ), - ungated!( - track_caller, Normal, - ), - ungated!( - instruction_set, Normal, - ), - gated!( - unsafe force_target_feature, Normal, + ungated!(inline,), + ungated!(cold,), + ungated!(no_builtins,), + ungated!(target_feature,), + ungated!(track_caller,), + ungated!(instruction_set,), + gated!( + unsafe force_target_feature, effective_target_features, experimental!(force_target_feature) ), gated!( - sanitize, Normal, - sanitize, experimental!(sanitize), - ), + sanitize, + sanitize, experimental!(sanitize),), gated!( - coverage, Normal, + coverage, coverage_attribute, experimental!(coverage) ), - ungated!( - doc, Normal, - ), + ungated!(doc,), // Debugging - ungated!( - debugger_visualizer, Normal, - ), - ungated!( - collapse_debuginfo, Normal, - ), + ungated!(debugger_visualizer,), + ungated!(collapse_debuginfo,), // ========================================================================== // Unstable attributes: @@ -549,60 +425,56 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Linking: gated!( - export_stable, Normal, experimental!(export_stable) + export_stable, experimental!(export_stable) ), // Testing: gated!( - test_runner, CrateLevel, custom_test_frameworks, - "custom test frameworks are an unstable feature", - ), + test_runner, custom_test_frameworks, + "custom test frameworks are an unstable feature",), gated!( - reexport_test_harness_main, CrateLevel, custom_test_frameworks, - "custom test frameworks are an unstable feature", - ), + reexport_test_harness_main, custom_test_frameworks, + "custom test frameworks are an unstable feature",), // RFC #1268 gated!( - marker, Normal,marker_trait_attr, experimental!(marker) + marker,marker_trait_attr, experimental!(marker) ), gated!( - thread_local, Normal,"`#[thread_local]` is an experimental feature, and does not currently handle destructors", - ), + thread_local,"`#[thread_local]` is an experimental feature, and does not currently handle destructors",), gated!( - no_core, CrateLevel, experimental!(no_core) + no_core, experimental!(no_core) ), // RFC 2412 gated!( - optimize, Normal, + optimize, optimize_attribute, experimental!(optimize) ), gated!( - unsafe ffi_pure, Normal, experimental!(ffi_pure) + unsafe ffi_pure, experimental!(ffi_pure) ), gated!( - unsafe ffi_const, Normal, experimental!(ffi_const) + unsafe ffi_const, experimental!(ffi_const) ), gated!( - register_tool, CrateLevel, experimental!(register_tool), - ), + register_tool, experimental!(register_tool),), // `#[cfi_encoding = ""]` gated!( - cfi_encoding, Normal, + cfi_encoding, experimental!(cfi_encoding) ), // `#[coroutine]` attribute to be applied to closures to make them coroutines instead gated!( - coroutine, Normal,coroutines, experimental!(coroutine) + coroutine,coroutines, experimental!(coroutine) ), // RFC 3543 // `#[patchable_function_entry(prefix_nops = m, entry_nops = n)]` gated!( - patchable_function_entry, Normal, + patchable_function_entry, experimental!(patchable_function_entry) ), @@ -611,10 +483,10 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/132306 gated!( - const_continue, Normal,loop_match, experimental!(const_continue) + const_continue,loop_match, experimental!(const_continue) ), gated!( - loop_match, Normal,loop_match, experimental!(loop_match) + loop_match,loop_match, experimental!(loop_match) ), // The `#[pin_v2]` attribute is part of the `pin_ergonomics` experiment @@ -622,57 +494,40 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // // - https://github.com/rust-lang/rust/issues/130494 gated!( - pin_v2, Normal,pin_ergonomics, experimental!(pin_v2), + pin_v2,pin_ergonomics, experimental!(pin_v2), ), // ========================================================================== // Internal attributes: Stability, deprecation, and unsafe: // ========================================================================== - ungated!( - feature, CrateLevel, - ), + ungated!(feature,), // DuplicatesOk since it has its own validation - ungated!( - stable, Normal, - ), - ungated!( - unstable, Normal, - ), - ungated!( - unstable_feature_bound, Normal, - ), - ungated!( - rustc_const_unstable, Normal, - ), - ungated!( - rustc_const_stable, Normal, - ), - ungated!( - rustc_default_body_unstable, Normal, - ), + ungated!(stable,), + ungated!(unstable,), + ungated!(unstable_feature_bound,), + ungated!(rustc_const_unstable,), + ungated!(rustc_const_stable,), + ungated!(rustc_default_body_unstable,), gated!( - allow_internal_unstable, Normal, - "allow_internal_unstable side-steps feature gating and stability checks", + allow_internal_unstable, + "allow_internal_unstable side-steps feature gating and stability checks", ), gated!( - allow_internal_unsafe, Normal, "allow_internal_unsafe side-steps the unsafe_code lint", + allow_internal_unsafe, "allow_internal_unsafe side-steps the unsafe_code lint", ), gated!( - rustc_eii_foreign_item, Normal, + rustc_eii_foreign_item, eii_internals, "used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), - rustc_attr!( - rustc_allowed_through_unstable_modules, Normal, + rustc_attr!(rustc_allowed_through_unstable_modules, "rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \ through unstable paths" ), - rustc_attr!( - rustc_deprecated_safe_2024, Normal,"`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", + rustc_attr!(rustc_deprecated_safe_2024,"`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", ), - rustc_attr!( - rustc_pub_transparent, Normal,"used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", + rustc_attr!(rustc_pub_transparent,"used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", ), @@ -680,16 +535,13 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes: Type system related: // ========================================================================== - gated!(fundamental, Normal, experimental!(fundamental)), + gated!(fundamental, experimental!(fundamental)), gated!( - may_dangle, Normal, dropck_eyepatch, - "`may_dangle` has unstable semantics and may be removed in the future", - ), + may_dangle, dropck_eyepatch, + "`may_dangle` has unstable semantics and may be removed in the future",), - rustc_attr!( - rustc_never_type_options, - Normal, - "`rustc_never_type_options` is used to experiment with never type fallback and work on \ + rustc_attr!(rustc_never_type_options, + "`rustc_never_type_options` is used to experiment with never type fallback and work on \ never type stabilization" ), @@ -697,158 +549,101 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes: Runtime related: // ========================================================================== - rustc_attr!( - rustc_allocator, Normal, - ), - rustc_attr!( - rustc_nounwind, Normal, - ), - rustc_attr!( - rustc_reallocator, Normal, - ), - rustc_attr!( - rustc_deallocator, Normal, - ), - rustc_attr!( - rustc_allocator_zeroed, Normal, - ), - rustc_attr!( - rustc_allocator_zeroed_variant, Normal, - ), + rustc_attr!(rustc_allocator,), + rustc_attr!(rustc_nounwind,), + rustc_attr!(rustc_reallocator,), + rustc_attr!(rustc_deallocator,), + rustc_attr!(rustc_allocator_zeroed,), + rustc_attr!(rustc_allocator_zeroed_variant,), gated!( - default_lib_allocator, Normal, allocator_internals, experimental!(default_lib_allocator), + default_lib_allocator, allocator_internals, experimental!(default_lib_allocator), ), gated!( - needs_allocator, Normal, allocator_internals, experimental!(needs_allocator), + needs_allocator, allocator_internals, experimental!(needs_allocator), ), gated!( - panic_runtime, CrateLevel, experimental!(panic_runtime) + panic_runtime, experimental!(panic_runtime) ), gated!( - needs_panic_runtime, CrateLevel, experimental!(needs_panic_runtime) + needs_panic_runtime, experimental!(needs_panic_runtime) ), gated!( - compiler_builtins, CrateLevel, + compiler_builtins, "the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate \ - which contains compiler-rt intrinsics and will never be stable", - ), + which contains compiler-rt intrinsics and will never be stable",), gated!( - profiler_runtime, CrateLevel, + profiler_runtime, "the `#[profiler_runtime]` attribute is used to identify the `profiler_builtins` crate \ - which contains the profiler runtime and will never be stable", - ), + which contains the profiler runtime and will never be stable",), // ========================================================================== // Internal attributes, Linkage: // ========================================================================== gated!( - linkage, Normal, - "the `linkage` attribute is experimental and not portable across platforms", - ), - rustc_attr!( - rustc_std_internal_symbol, Normal, - ), - rustc_attr!( - rustc_objc_class, Normal, - ), - rustc_attr!( - rustc_objc_selector, Normal, - ), + linkage, + "the `linkage` attribute is experimental and not portable across platforms",), + rustc_attr!(rustc_std_internal_symbol,), + rustc_attr!(rustc_objc_class,), + rustc_attr!(rustc_objc_selector,), // ========================================================================== // Internal attributes, Macro related: // ========================================================================== - rustc_attr!( - rustc_builtin_macro, Normal, - ), - rustc_attr!( - rustc_proc_macro_decls, Normal, - ), - rustc_attr!( - rustc_macro_transparency, Normal, - "used internally for testing macro hygiene", - ), - rustc_attr!( - rustc_autodiff, Normal, - ), - rustc_attr!( - rustc_offload_kernel, Normal, - ), + rustc_attr!(rustc_builtin_macro,), + rustc_attr!(rustc_proc_macro_decls,), + rustc_attr!(rustc_macro_transparency, + "used internally for testing macro hygiene",), + rustc_attr!(rustc_autodiff,), + rustc_attr!(rustc_offload_kernel,), // Traces that are left when `cfg` and `cfg_attr` attributes are expanded. // The attributes are not gated, to avoid stability errors, but they cannot be used in stable // or unstable code directly because `sym::cfg_(attr_)trace` are not valid identifiers, they // can only be generated by the compiler. - ungated!( - cfg_trace, Normal + ungated!(cfg_trace ), - ungated!( - cfg_attr_trace, Normal + ungated!(cfg_attr_trace ), // ========================================================================== // Internal attributes, Diagnostics related: // ========================================================================== - rustc_attr!( - rustc_on_unimplemented, Normal,"see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" + rustc_attr!(rustc_on_unimplemented,"see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" ), - rustc_attr!( - rustc_confusables, Normal, - ), + rustc_attr!(rustc_confusables,), // Enumerates "identity-like" conversion methods to suggest on type mismatch. - rustc_attr!( - rustc_conversion_suggestion, Normal, - ), + rustc_attr!(rustc_conversion_suggestion,), // Prevents field reads in the marked trait or method to be considered // during dead code analysis. - rustc_attr!( - rustc_trivial_field_reads, Normal, - ), + rustc_attr!(rustc_trivial_field_reads,), // Used by the `rustc::potential_query_instability` lint to warn methods which // might not be stable during incremental compilation. - rustc_attr!( - rustc_lint_query_instability, Normal, - ), + rustc_attr!(rustc_lint_query_instability,), // Used by the `rustc::untracked_query_information` lint to warn methods which // might not be stable during incremental compilation. - rustc_attr!( - rustc_lint_untracked_query_information, Normal, - ), + rustc_attr!(rustc_lint_untracked_query_information,), // Used by the `rustc::bad_opt_access` lint to identify `DebuggingOptions` and `CodegenOptions` // types (as well as any others in future). - rustc_attr!( - rustc_lint_opt_ty, Normal, - ), + rustc_attr!(rustc_lint_opt_ty,), // Used by the `rustc::bad_opt_access` lint on fields // types (as well as any others in future). - rustc_attr!( - rustc_lint_opt_deny_field_access, Normal, - ), + rustc_attr!(rustc_lint_opt_deny_field_access,), // ========================================================================== // Internal attributes, Const related: // ========================================================================== - rustc_attr!( - rustc_promotable, Normal, ), - rustc_attr!( - rustc_legacy_const_generics, Normal, ), + rustc_attr!(rustc_promotable,), + rustc_attr!(rustc_legacy_const_generics,), // Do not const-check this function's body. It will always get replaced during CTFE via `hook_special_const_fn`. - rustc_attr!( - rustc_do_not_const_check, Normal, "`#[rustc_do_not_const_check]` skips const-check for this function's body", - ), - rustc_attr!( - rustc_const_stable_indirect, Normal, - "this is an internal implementation detail", - ), - rustc_attr!( - rustc_intrinsic_const_stable_indirect, Normal, - "this is an internal implementation detail", - ), - rustc_attr!( - rustc_allow_const_fn_unstable, Normal, + rustc_attr!(rustc_do_not_const_check, "`#[rustc_do_not_const_check]` skips const-check for this function's body",), + rustc_attr!(rustc_const_stable_indirect, + "this is an internal implementation detail",), + rustc_attr!(rustc_intrinsic_const_stable_indirect, + "this is an internal implementation detail",), + rustc_attr!(rustc_allow_const_fn_unstable, "rustc_allow_const_fn_unstable side-steps feature gating and stability checks" ), @@ -856,81 +651,57 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes, Layout related: // ========================================================================== - rustc_attr!( - rustc_layout_scalar_valid_range_start, Normal, "the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \ - niche optimizations in the standard library", - ), - rustc_attr!( - rustc_layout_scalar_valid_range_end, Normal, "the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \ - niche optimizations in the standard library", - ), - rustc_attr!( - rustc_simd_monomorphize_lane_limit, Normal, "the `#[rustc_simd_monomorphize_lane_limit]` attribute is just used by std::simd \ - for better error messages", - ), - rustc_attr!( - rustc_nonnull_optimization_guaranteed, Normal, + rustc_attr!(rustc_layout_scalar_valid_range_start, "the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \ + niche optimizations in the standard library",), + rustc_attr!(rustc_layout_scalar_valid_range_end, "the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \ + niche optimizations in the standard library",), + rustc_attr!(rustc_simd_monomorphize_lane_limit, "the `#[rustc_simd_monomorphize_lane_limit]` attribute is just used by std::simd \ + for better error messages",), + rustc_attr!(rustc_nonnull_optimization_guaranteed, "the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to document \ guaranteed niche optimizations in the standard library", "the compiler does not even check whether the type indeed is being non-null-optimized; \ - it is your responsibility to ensure that the attribute is only used on types that are optimized", - ), + it is your responsibility to ensure that the attribute is only used on types that are optimized",), // ========================================================================== // Internal attributes, Misc: // ========================================================================== gated!( - lang, Normal,lang_items, - "lang items are subject to change", - ), - rustc_attr!( - rustc_as_ptr, Normal, "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations" + lang,lang_items, + "lang items are subject to change",), + rustc_attr!(rustc_as_ptr, "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations" ), - rustc_attr!( - rustc_should_not_be_called_on_const_items, Normal, "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts" + rustc_attr!(rustc_should_not_be_called_on_const_items, "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts" ), - rustc_attr!( - rustc_pass_by_value, Normal, "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference" + rustc_attr!(rustc_pass_by_value, "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference" ), - rustc_attr!( - rustc_never_returns_null_ptr, Normal, "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers" + rustc_attr!(rustc_never_returns_null_ptr, "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers" ), - rustc_attr!( - rustc_no_implicit_autorefs, AttributeType::Normal, "`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" + rustc_attr!(rustc_no_implicit_autorefs, "`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" ), - rustc_attr!( - rustc_coherence_is_core, AttributeType::CrateLevel, "`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" + rustc_attr!(rustc_coherence_is_core, "`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" ), - rustc_attr!( - rustc_coinductive, AttributeType::Normal,"`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" + rustc_attr!(rustc_coinductive, "`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" ), - rustc_attr!( - rustc_allow_incoherent_impl, AttributeType::Normal, "`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" + rustc_attr!(rustc_allow_incoherent_impl, "`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" ), - rustc_attr!( - rustc_preserve_ub_checks, AttributeType::CrateLevel, "`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR", + rustc_attr!(rustc_preserve_ub_checks, "`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR",), + rustc_attr!(rustc_deny_explicit_impl, + "`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" ), - rustc_attr!( - rustc_deny_explicit_impl, - AttributeType::Normal,"`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" - ), - rustc_attr!( - rustc_dyn_incompatible_trait, - AttributeType::Normal,"`#[rustc_dyn_incompatible_trait]` marks a trait as dyn-incompatible, \ + rustc_attr!(rustc_dyn_incompatible_trait, + "`#[rustc_dyn_incompatible_trait]` marks a trait as dyn-incompatible, \ even if it otherwise satisfies the requirements to be dyn-compatible." ), - rustc_attr!( - rustc_has_incoherent_inherent_impls, AttributeType::Normal,"`#[rustc_has_incoherent_inherent_impls]` allows the addition of incoherent inherent impls for \ + rustc_attr!(rustc_has_incoherent_inherent_impls, "`#[rustc_has_incoherent_inherent_impls]` allows the addition of incoherent inherent impls for \ the given type by annotating all impl items with `#[rustc_allow_incoherent_impl]`" ), - rustc_attr!( - rustc_non_const_trait_method, AttributeType::Normal,"`#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods \ + rustc_attr!(rustc_non_const_trait_method, "`#[rustc_non_const_trait_method]` should only used by the standard library to mark trait methods \ as non-const to allow large traits an easier transition to const" ), BuiltinAttribute { name: sym::rustc_diagnostic_item, - type_: Normal, safety: AttributeSafety::Normal, gate: Gated { feature: sym::rustc_attrs, @@ -942,154 +713,80 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ }, gated!( // Used in resolve: - prelude_import, Normal, "`#[prelude_import]` is for use by rustc only", + prelude_import, "`#[prelude_import]` is for use by rustc only", ), gated!( - rustc_paren_sugar, Normal,unboxed_closures, "unboxed_closures are still evolving", + rustc_paren_sugar,unboxed_closures, "unboxed_closures are still evolving", ), - rustc_attr!( - rustc_inherit_overflow_checks, Normal,"the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ + rustc_attr!(rustc_inherit_overflow_checks,"the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ overflow checking behavior of several functions in the standard library that are inlined \ - across crates", - ), - rustc_attr!( - rustc_reservation_impl, Normal,"the `#[rustc_reservation_impl]` attribute is internally used \ + across crates",), + rustc_attr!(rustc_reservation_impl,"the `#[rustc_reservation_impl]` attribute is internally used \ for reserving `impl From for T` as part of the effort to stabilize `!`" ), - rustc_attr!( - rustc_test_marker, Normal, "the `#[rustc_test_marker]` attribute is used internally to track tests", - ), - rustc_attr!( - rustc_unsafe_specialization_marker, Normal, + rustc_attr!(rustc_test_marker, "the `#[rustc_test_marker]` attribute is used internally to track tests",), + rustc_attr!(rustc_unsafe_specialization_marker, "the `#[rustc_unsafe_specialization_marker]` attribute is used to check specializations" ), - rustc_attr!( - rustc_specialization_trait, Normal, + rustc_attr!(rustc_specialization_trait, "the `#[rustc_specialization_trait]` attribute is used to check specializations" ), - rustc_attr!( - rustc_main, Normal,"the `#[rustc_main]` attribute is used internally to specify test entry point function", - ), - rustc_attr!( - rustc_skip_during_method_dispatch, Normal, "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ + rustc_attr!(rustc_main,"the `#[rustc_main]` attribute is used internally to specify test entry point function",), + rustc_attr!(rustc_skip_during_method_dispatch, "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ from method dispatch when the receiver is of the following type, for compatibility in \ editions < 2021 (array) or editions < 2024 (boxed_slice)" ), - rustc_attr!( - rustc_must_implement_one_of, Normal,"the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ + rustc_attr!(rustc_must_implement_one_of,"the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ definition of a trait. Its syntax and semantics are highly experimental and will be \ subject to change before stabilization", ), - rustc_attr!( - rustc_doc_primitive, Normal,"the `#[rustc_doc_primitive]` attribute is used by the standard library \ + rustc_attr!(rustc_doc_primitive,"the `#[rustc_doc_primitive]` attribute is used by the standard library \ to provide a way to generate documentation for primitive types", ), gated!( - rustc_intrinsic, Normal,intrinsics, - "the `#[rustc_intrinsic]` attribute is used to declare intrinsics as function items", - ), - rustc_attr!( - rustc_no_mir_inline, Normal,"`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" - ), - rustc_attr!( - rustc_force_inline, Normal,"`#[rustc_force_inline]` forces a free function to be inlined" - ), - rustc_attr!( - rustc_scalable_vector, Normal,"`#[rustc_scalable_vector]` defines a scalable vector type" + rustc_intrinsic,intrinsics, + "the `#[rustc_intrinsic]` attribute is used to declare intrinsics as function items",), + rustc_attr!(rustc_no_mir_inline,"`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" ), + rustc_attr!(rustc_force_inline,"`#[rustc_force_inline]` forces a free function to be inlined"), + rustc_attr!(rustc_scalable_vector,"`#[rustc_scalable_vector]` defines a scalable vector type"), // ========================================================================== // Internal attributes, Testing: // ========================================================================== - rustc_attr!(TEST, rustc_effective_visibility, Normal,), - rustc_attr!( - TEST, rustc_dump_inferred_outlives, Normal, - ), - rustc_attr!( - TEST, rustc_capture_analysis, Normal, - ), - rustc_attr!( - TEST, rustc_insignificant_dtor, Normal, - ), - rustc_attr!( - TEST, rustc_no_implicit_bounds, CrateLevel, - ), - rustc_attr!( - TEST, rustc_strict_coherence, Normal, - ), - rustc_attr!( - TEST, rustc_dump_variances, Normal, - ), - rustc_attr!( - TEST, rustc_dump_variances_of_opaques, Normal, - ), - rustc_attr!( - TEST, rustc_hidden_type_of_opaques, Normal, - ), - rustc_attr!( - TEST, rustc_layout, Normal, - ), - rustc_attr!( - TEST, rustc_abi, Normal, - ), - rustc_attr!( - TEST, rustc_regions, Normal, - ), - rustc_attr!( - TEST, rustc_delayed_bug_from_inside_query, Normal, - ), - rustc_attr!( - TEST, rustc_dump_user_args, Normal, - ), - rustc_attr!( - TEST, rustc_evaluate_where_clauses, Normal, - ), - rustc_attr!( - TEST, rustc_if_this_changed, Normal, ), - rustc_attr!( - TEST, rustc_then_this_would_need, Normal, ), - rustc_attr!( - TEST, rustc_clean, Normal, - ), - rustc_attr!( - TEST, rustc_partition_reused, Normal, - ), - rustc_attr!( - TEST, rustc_partition_codegened, Normal, - ), - rustc_attr!( - TEST, rustc_expected_cgu_reuse, Normal, - ), - rustc_attr!( - TEST, rustc_symbol_name, Normal, - ), - rustc_attr!( - TEST, rustc_def_path, Normal, - ), - rustc_attr!( - TEST, rustc_mir, Normal, - ), - gated!( - custom_mir, Normal,"the `#[custom_mir]` attribute is just used for the Rust test suite", - ), - rustc_attr!( - TEST, rustc_dump_item_bounds, Normal, - ), - rustc_attr!( - TEST, rustc_dump_predicates, Normal, - ), - rustc_attr!( - TEST, rustc_dump_def_parents, Normal, - ), - rustc_attr!( - TEST, rustc_dump_object_lifetime_defaults, Normal, - ), - rustc_attr!( - TEST, rustc_dump_vtable, Normal, - ), - rustc_attr!(TEST, rustc_dummy, Normal,), - rustc_attr!(TEST, pattern_complexity_limit, CrateLevel, ), + rustc_attr!(TEST, rustc_effective_visibility,), + rustc_attr!(TEST, rustc_dump_inferred_outlives,), + rustc_attr!(TEST, rustc_capture_analysis,), + rustc_attr!(TEST, rustc_insignificant_dtor,), + rustc_attr!(TEST, rustc_no_implicit_bounds,), + rustc_attr!(TEST, rustc_strict_coherence,), + rustc_attr!(TEST, rustc_dump_variances,), + rustc_attr!(TEST, rustc_dump_variances_of_opaques,), + rustc_attr!(TEST, rustc_hidden_type_of_opaques,), + rustc_attr!(TEST, rustc_layout,), + rustc_attr!(TEST, rustc_abi,), + rustc_attr!(TEST, rustc_regions,), + rustc_attr!(TEST, rustc_delayed_bug_from_inside_query,), + rustc_attr!(TEST, rustc_dump_user_args,), + rustc_attr!(TEST, rustc_evaluate_where_clauses,), + rustc_attr!(TEST, rustc_if_this_changed,), + rustc_attr!(TEST, rustc_then_this_would_need,), + rustc_attr!(TEST, rustc_clean,), + rustc_attr!(TEST, rustc_partition_reused,), + rustc_attr!(TEST, rustc_partition_codegened,), + rustc_attr!(TEST, rustc_expected_cgu_reuse,), + rustc_attr!(TEST, rustc_symbol_name,), + rustc_attr!(TEST, rustc_def_path,), + rustc_attr!(TEST, rustc_mir,), + gated!(custom_mir,"the `#[custom_mir]` attribute is just used for the Rust test suite",), + rustc_attr!(TEST, rustc_dump_item_bounds,), + rustc_attr!(TEST, rustc_dump_predicates,), + rustc_attr!(TEST, rustc_dump_def_parents,), + rustc_attr!(TEST, rustc_dump_object_lifetime_defaults,), + rustc_attr!(TEST, rustc_dump_vtable,), + rustc_attr!(TEST, rustc_dummy,), + rustc_attr!(TEST, pattern_complexity_limit,), ]; pub fn is_builtin_attr_name(name: Symbol) -> bool { diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs index db37e4534df9d..40a637bfa0b8f 100644 --- a/compiler/rustc_feature/src/lib.rs +++ b/compiler/rustc_feature/src/lib.rs @@ -129,9 +129,9 @@ pub fn find_feature_issue(feature: Symbol, issue: GateIssue) -> Option CheckAttrVisitor<'tcx> { } } - if hir_id != CRATE_HIR_ID { - match attr { - Attribute::Parsed(_) => { /* Already validated. */ } - Attribute::Unparsed(attr) => { - // FIXME(jdonszelmann): remove once all crate-level attrs are parsed and caught by - // the above - if let Some(BuiltinAttribute { type_: AttributeType::CrateLevel, .. }) = - attr.path - .segments - .first() - .and_then(|name| BUILTIN_ATTRIBUTE_MAP.get(&name)) - { - match attr.style { - ast::AttrStyle::Outer => { - let attr_span = attr.span; - let bang_position = self - .tcx - .sess - .source_map() - .span_until_char(attr_span, '[') - .shrink_to_hi(); - - self.tcx.emit_node_span_lint( - UNUSED_ATTRIBUTES, - hir_id, - attr.span, - errors::OuterCrateLevelAttr { - suggestion: errors::OuterCrateLevelAttrSuggestion { - bang_position, - }, - }, - ) - } - ast::AttrStyle::Inner => self.tcx.emit_node_span_lint( - UNUSED_ATTRIBUTES, - hir_id, - attr.span, - errors::InnerCrateLevelAttr, - ), - } - } - } - } - } - self.check_unused_attribute(hir_id, attr) } From c7f99c4138ff82df34844fd263b243e44ee7ee40 Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Sat, 4 Apr 2026 14:49:19 +0200 Subject: [PATCH 7/9] Remove AttributeSafety from BUILTIN_ATTRIBUTES --- .../rustc_attr_parsing/src/attributes/cfg.rs | 2 + .../src/attributes/cfg_select.rs | 2 + .../src/attributes/codegen_attrs.rs | 6 + .../src/attributes/link_attrs.rs | 5 + .../rustc_attr_parsing/src/attributes/mod.rs | 20 + compiler/rustc_attr_parsing/src/context.rs | 4 +- compiler/rustc_attr_parsing/src/interface.rs | 35 +- compiler/rustc_attr_parsing/src/lib.rs | 1 + compiler/rustc_attr_parsing/src/safety.rs | 24 +- compiler/rustc_builtin_macros/src/cfg.rs | 4 +- compiler/rustc_expand/src/config.rs | 5 +- compiler/rustc_expand/src/expand.rs | 5 +- compiler/rustc_feature/src/builtin_attrs.rs | 429 ++++++++---------- compiler/rustc_feature/src/lib.rs | 2 +- 14 files changed, 271 insertions(+), 273 deletions(-) diff --git a/compiler/rustc_attr_parsing/src/attributes/cfg.rs b/compiler/rustc_attr_parsing/src/attributes/cfg.rs index ccc4a1a64c56f..8d000ebe9236c 100644 --- a/compiler/rustc_attr_parsing/src/attributes/cfg.rs +++ b/compiler/rustc_attr_parsing/src/attributes/cfg.rs @@ -19,6 +19,7 @@ use rustc_session::parse::{ParseSess, feature_err}; use rustc_span::{ErrorGuaranteed, Span, Symbol, sym}; use thin_vec::ThinVec; +use crate::attributes::AttributeSafety; use crate::context::{AcceptContext, ShouldEmit, Stage}; use crate::parser::{ AllowExprMetavar, ArgParser, MetaItemListParser, MetaItemOrLitParser, NameValueParser, @@ -408,6 +409,7 @@ fn parse_cfg_attr_internal<'a>( attribute.style, AttrPath { segments: attribute.path().into_boxed_slice(), span: attribute.span }, Some(attribute.get_normal_item().unsafety), + AttributeSafety::Normal, ParsedDescription::Attribute, pred_span, CRATE_NODE_ID, diff --git a/compiler/rustc_attr_parsing/src/attributes/cfg_select.rs b/compiler/rustc_attr_parsing/src/attributes/cfg_select.rs index 4ff224006ca89..918fd0a4582b7 100644 --- a/compiler/rustc_attr_parsing/src/attributes/cfg_select.rs +++ b/compiler/rustc_attr_parsing/src/attributes/cfg_select.rs @@ -12,6 +12,7 @@ use rustc_session::Session; use rustc_session::lint::builtin::UNREACHABLE_CFG_SELECT_PREDICATES; use rustc_span::{ErrorGuaranteed, Span, Symbol, sym}; +use crate::attributes::AttributeSafety; use crate::parser::{AllowExprMetavar, MetaItemOrLitParser}; use crate::{AttributeParser, ParsedDescription, ShouldEmit, errors, parse_cfg_entry}; @@ -105,6 +106,7 @@ pub fn parse_cfg_select( AttrStyle::Inner, AttrPath { segments: vec![sym::cfg_select].into_boxed_slice(), span: cfg_span }, None, + AttributeSafety::Normal, ParsedDescription::Macro, cfg_span, lint_node_id, diff --git a/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs b/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs index 93664aff49157..1c49d9808d8ed 100644 --- a/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs +++ b/compiler/rustc_attr_parsing/src/attributes/codegen_attrs.rs @@ -1,7 +1,9 @@ use rustc_hir::attrs::{CoverageAttrKind, OptimizeAttr, RtsanSetting, SanitizerSet, UsedBy}; use rustc_session::parse::feature_err; +use rustc_span::edition::Edition::Edition2024; use super::prelude::*; +use crate::attributes::AttributeSafety; use crate::session_diagnostics::{ NakedFunctionIncompatibleAttribute, NullOnExport, NullOnObjcClass, NullOnObjcSelector, ObjcClassExpectedStringLiteral, ObjcSelectorExpectedStringLiteral, @@ -121,6 +123,7 @@ pub(crate) struct ExportNameParser; impl SingleAttributeParser for ExportNameParser { const PATH: &[rustc_span::Symbol] = &[sym::export_name]; const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError; + const SAFETY: AttributeSafety = AttributeSafety::Unsafe { unsafe_since: Some(Edition2024) }; const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[ Allow(Target::Static), Allow(Target::Fn), @@ -238,6 +241,7 @@ impl AttributeParser for NakedParser { this.span = Some(cx.attr_span); } })]; + const SAFETY: AttributeSafety = AttributeSafety::Unsafe { unsafe_since: None }; const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[ Allow(Target::Fn), Allow(Target::Method(MethodKind::Inherent)), @@ -363,6 +367,7 @@ pub(crate) struct NoMangleParser; impl NoArgsAttributeParser for NoMangleParser { const PATH: &[Symbol] = &[sym::no_mangle]; const ON_DUPLICATE: OnDuplicate = OnDuplicate::Warn; + const SAFETY: AttributeSafety = AttributeSafety::Unsafe { unsafe_since: Some(Edition2024) }; const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowListWarnRest(&[ Allow(Target::Fn), Allow(Target::Static), @@ -565,6 +570,7 @@ pub(crate) struct ForceTargetFeatureParser; impl CombineAttributeParser for ForceTargetFeatureParser { type Item = (Symbol, Span); const PATH: &[Symbol] = &[sym::force_target_feature]; + const SAFETY: AttributeSafety = AttributeSafety::Unsafe { unsafe_since: None }; const CONVERT: ConvertFn = |items, span| AttributeKind::TargetFeature { features: items, attr_span: span, diff --git a/compiler/rustc_attr_parsing/src/attributes/link_attrs.rs b/compiler/rustc_attr_parsing/src/attributes/link_attrs.rs index e1ae2068f9fd3..c70c9a0d7db53 100644 --- a/compiler/rustc_attr_parsing/src/attributes/link_attrs.rs +++ b/compiler/rustc_attr_parsing/src/attributes/link_attrs.rs @@ -5,11 +5,13 @@ use rustc_hir::attrs::*; use rustc_session::Session; use rustc_session::lint::builtin::ILL_FORMED_ATTRIBUTE_INPUT; use rustc_session::parse::feature_err; +use rustc_span::edition::Edition::Edition2024; use rustc_span::kw; use rustc_target::spec::{Arch, BinaryFormat}; use super::prelude::*; use super::util::parse_single_integer; +use crate::attributes::AttributeSafety; use crate::attributes::cfg::parse_cfg_entry; use crate::session_diagnostics::{ AsNeededCompatibility, BundleNeedsStatic, EmptyLinkName, ExportSymbolsNeedsStatic, @@ -468,6 +470,7 @@ pub(crate) struct LinkSectionParser; impl SingleAttributeParser for LinkSectionParser { const PATH: &[Symbol] = &[sym::link_section]; const ON_DUPLICATE: OnDuplicate = OnDuplicate::WarnButFutureError; + const SAFETY: AttributeSafety = AttributeSafety::Unsafe { unsafe_since: Some(Edition2024) }; const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowListWarnRest(&[ Allow(Target::Static), Allow(Target::Fn), @@ -513,6 +516,7 @@ pub(crate) struct FfiConstParser; impl NoArgsAttributeParser for FfiConstParser { const PATH: &[Symbol] = &[sym::ffi_const]; const ON_DUPLICATE: OnDuplicate = OnDuplicate::Warn; + const SAFETY: AttributeSafety = AttributeSafety::Unsafe { unsafe_since: None }; const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::ForeignFn)]); const CREATE: fn(Span) -> AttributeKind = AttributeKind::FfiConst; } @@ -521,6 +525,7 @@ pub(crate) struct FfiPureParser; impl NoArgsAttributeParser for FfiPureParser { const PATH: &[Symbol] = &[sym::ffi_pure]; const ON_DUPLICATE: OnDuplicate = OnDuplicate::Warn; + const SAFETY: AttributeSafety = AttributeSafety::Unsafe { unsafe_since: None }; const ALLOWED_TARGETS: AllowedTargets = AllowedTargets::AllowList(&[Allow(Target::ForeignFn)]); const CREATE: fn(Span) -> AttributeKind = AttributeKind::FfiPure; } diff --git a/compiler/rustc_attr_parsing/src/attributes/mod.rs b/compiler/rustc_attr_parsing/src/attributes/mod.rs index 66f452040954b..1e9292f67f7b6 100644 --- a/compiler/rustc_attr_parsing/src/attributes/mod.rs +++ b/compiler/rustc_attr_parsing/src/attributes/mod.rs @@ -18,6 +18,7 @@ use std::marker::PhantomData; use rustc_feature::{AttributeTemplate, template}; use rustc_hir::attrs::AttributeKind; +use rustc_span::edition::Edition; use rustc_span::{Span, Symbol}; use thin_vec::ThinVec; @@ -98,6 +99,7 @@ pub(crate) trait AttributeParser: Default + 'static { /// If an attribute has this symbol, the `accept` function will be called on it. const ATTRIBUTES: AcceptMapping; const ALLOWED_TARGETS: AllowedTargets; + const SAFETY: AttributeSafety = AttributeSafety::Normal; /// The parser has gotten a chance to accept the attributes on an item, /// here it can produce an attribute. @@ -128,6 +130,7 @@ pub(crate) trait SingleAttributeParser: 'static { /// Configures what to do when when the same attribute is /// applied more than once on the same syntax node. const ON_DUPLICATE: OnDuplicate; + const SAFETY: AttributeSafety = AttributeSafety::Normal; const ALLOWED_TARGETS: AllowedTargets; @@ -166,6 +169,7 @@ impl, S: Stage> AttributeParser for Single }, )]; const ALLOWED_TARGETS: AllowedTargets = T::ALLOWED_TARGETS; + const SAFETY: AttributeSafety = T::SAFETY; fn finalize(self, _cx: &FinalizeContext<'_, '_, S>) -> Option { Some(self.1?.0) @@ -218,6 +222,18 @@ impl OnDuplicate { } } +#[derive(Copy, Clone, PartialEq, Debug)] +pub enum AttributeSafety { + /// Normal attribute that does not need `#[unsafe(...)]` + Normal, + /// Unsafe attribute that requires safety obligations to be discharged. + /// + /// An error is emitted when `#[unsafe(...)]` is omitted, except when the attribute's edition + /// is less than the one stored in `unsafe_since`. This handles attributes that were safe in + /// earlier editions, but become unsafe in later ones. + Unsafe { unsafe_since: Option }, +} + /// An even simpler version of [`SingleAttributeParser`]: /// now automatically check that there are no arguments provided to the attribute. /// @@ -227,6 +243,7 @@ pub(crate) trait NoArgsAttributeParser: 'static { const PATH: &[Symbol]; const ON_DUPLICATE: OnDuplicate; const ALLOWED_TARGETS: AllowedTargets; + const SAFETY: AttributeSafety = AttributeSafety::Normal; /// Create the [`AttributeKind`] given attribute's [`Span`]. const CREATE: fn(Span) -> AttributeKind; @@ -243,6 +260,7 @@ impl, S: Stage> Default for WithoutArgs { impl, S: Stage> SingleAttributeParser for WithoutArgs { const PATH: &[Symbol] = T::PATH; const ON_DUPLICATE: OnDuplicate = T::ON_DUPLICATE; + const SAFETY: AttributeSafety = T::SAFETY; const ALLOWED_TARGETS: AllowedTargets = T::ALLOWED_TARGETS; const TEMPLATE: AttributeTemplate = template!(Word); @@ -272,6 +290,7 @@ pub(crate) trait CombineAttributeParser: 'static { /// For example, individual representations from `#[repr(...)]` attributes into an `AttributeKind::Repr(x)`, /// where `x` is a vec of these individual reprs. const CONVERT: ConvertFn; + const SAFETY: AttributeSafety = AttributeSafety::Normal; const ALLOWED_TARGETS: AllowedTargets; @@ -313,6 +332,7 @@ impl, S: Stage> AttributeParser for Combine) -> Option { if let Some(first_span) = self.first_span { diff --git a/compiler/rustc_attr_parsing/src/context.rs b/compiler/rustc_attr_parsing/src/context.rs index 74eb1222078d0..b52c2237433c4 100644 --- a/compiler/rustc_attr_parsing/src/context.rs +++ b/compiler/rustc_attr_parsing/src/context.rs @@ -59,7 +59,7 @@ use crate::attributes::stability::*; use crate::attributes::test_attrs::*; use crate::attributes::traits::*; use crate::attributes::transparency::*; -use crate::attributes::{AttributeParser as _, Combine, Single, WithoutArgs}; +use crate::attributes::{AttributeParser as _, AttributeSafety, Combine, Single, WithoutArgs}; use crate::parser::{ArgParser, RefPathParser}; use crate::session_diagnostics::{ AttributeParseError, AttributeParseErrorReason, AttributeParseErrorSuggestions, @@ -76,6 +76,7 @@ pub(super) struct GroupTypeInnerAccept { pub(super) template: AttributeTemplate, pub(super) accept_fn: AcceptFn, pub(super) allowed_targets: AllowedTargets, + pub(super) safety: AttributeSafety, pub(super) finalizer: FinalizeFn, } @@ -126,6 +127,7 @@ macro_rules! attribute_parsers { accept_fn(s, cx, args) }) }), + safety: <$names as crate::attributes::AttributeParser<$stage>>::SAFETY, allowed_targets: <$names as crate::attributes::AttributeParser<$stage>>::ALLOWED_TARGETS, finalizer: Box::new(|cx| { let state = STATE_OBJECT.take(); diff --git a/compiler/rustc_attr_parsing/src/interface.rs b/compiler/rustc_attr_parsing/src/interface.rs index e9d868039380b..a0fae010e0552 100644 --- a/compiler/rustc_attr_parsing/src/interface.rs +++ b/compiler/rustc_attr_parsing/src/interface.rs @@ -13,6 +13,7 @@ use rustc_session::Session; use rustc_session::lint::{BuiltinLintDiag, LintId}; use rustc_span::{DUMMY_SP, Ident, Span, Symbol, sym}; +use crate::attributes::AttributeSafety; use crate::context::{AcceptContext, FinalizeContext, FinalizeFn, SharedContext, Stage}; use crate::early_parsed::{EARLY_PARSED_ATTRIBUTES, EarlyParsedState}; use crate::parser::{AllowExprMetavar, ArgParser, PathParser, RefPathParser}; @@ -172,6 +173,7 @@ impl<'sess> AttributeParser<'sess, Early> { parse_fn: fn(cx: &mut AcceptContext<'_, '_, Early>, item: &ArgParser) -> Option, template: &AttributeTemplate, allow_expr_metavar: AllowExprMetavar, + expected_safety: AttributeSafety, ) -> Option { let ast::AttrKind::Normal(normal_attr) = &attr.kind else { panic!("parse_single called on a doc attr") @@ -194,6 +196,7 @@ impl<'sess> AttributeParser<'sess, Early> { attr.style, path, Some(normal_attr.item.unsafety), + expected_safety, ParsedDescription::Attribute, target_span, target_node_id, @@ -215,6 +218,7 @@ impl<'sess> AttributeParser<'sess, Early> { attr_style: AttrStyle, attr_path: AttrPath, attr_safety: Option, + expected_safety: AttributeSafety, parsed_description: ParsedDescription, target_span: Span, target_node_id: NodeId, @@ -236,7 +240,13 @@ impl<'sess> AttributeParser<'sess, Early> { ) }; if let Some(safety) = attr_safety { - parser.check_attribute_safety(&attr_path, inner_span, safety, &mut emit_lint) + parser.check_attribute_safety( + &attr_path, + inner_span, + safety, + expected_safety, + &mut emit_lint, + ) } let attr_id = sess.psess.attr_id_generator.mk_attr_id(); let mut cx: AcceptContext<'_, 'sess, Early> = AcceptContext { @@ -353,17 +363,18 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> { } }; - self.check_attribute_safety( - &attr_path, - lower_span(n.item.span()), - n.item.unsafety, - &mut emit_lint, - ); - let parts = n.item.path.segments.iter().map(|seg| seg.ident.name).collect::>(); if let Some(accept) = S::parsers().accepters.get(parts.as_slice()) { + self.check_attribute_safety( + &attr_path, + lower_span(n.item.span()), + n.item.unsafety, + accept.safety, + &mut emit_lint, + ); + let Some(args) = ArgParser::from_attr_args( args, &parts, @@ -437,6 +448,14 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> { span: attr_span, }; + self.check_attribute_safety( + &attr_path, + lower_span(n.item.span()), + n.item.unsafety, + AttributeSafety::Normal, + &mut emit_lint, + ); + if !matches!(self.stage.should_emit(), ShouldEmit::Nothing) && target == Target::Crate { diff --git a/compiler/rustc_attr_parsing/src/lib.rs b/compiler/rustc_attr_parsing/src/lib.rs index 93eb5a0c3ab73..1b08ed3c49b78 100644 --- a/compiler/rustc_attr_parsing/src/lib.rs +++ b/compiler/rustc_attr_parsing/src/lib.rs @@ -106,6 +106,7 @@ mod session_diagnostics; mod target_checking; pub mod validate_attr; +pub use attributes::AttributeSafety; pub use attributes::cfg::{ CFG_TEMPLATE, EvalConfigResult, eval_config_entry, parse_cfg, parse_cfg_attr, parse_cfg_entry, }; diff --git a/compiler/rustc_attr_parsing/src/safety.rs b/compiler/rustc_attr_parsing/src/safety.rs index 4cc703c5d0cc4..f560598cb80bf 100644 --- a/compiler/rustc_attr_parsing/src/safety.rs +++ b/compiler/rustc_attr_parsing/src/safety.rs @@ -1,11 +1,11 @@ use rustc_ast::Safety; -use rustc_feature::{AttributeSafety, BUILTIN_ATTRIBUTE_MAP}; use rustc_hir::AttrPath; use rustc_hir::lints::AttributeLintKind; use rustc_session::lint::LintId; use rustc_session::lint::builtin::UNSAFE_ATTR_OUTSIDE_UNSAFE; use rustc_span::Span; +use crate::attributes::AttributeSafety; use crate::context::Stage; use crate::{AttributeParser, ShouldEmit}; @@ -15,28 +15,23 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> { attr_path: &AttrPath, attr_span: Span, attr_safety: Safety, + expected_safety: AttributeSafety, emit_lint: &mut impl FnMut(LintId, Span, AttributeLintKind), ) { if matches!(self.stage.should_emit(), ShouldEmit::Nothing) { return; } - let name = (attr_path.segments.len() == 1).then_some(attr_path.segments[0]); - - // FIXME: We should retrieve this information from the attribute parsers instead of from `BUILTIN_ATTRIBUTE_MAP` - let builtin_attr_info = name.and_then(|name| BUILTIN_ATTRIBUTE_MAP.get(&name)); - let builtin_attr_safety = builtin_attr_info.map(|x| x.safety); - - match (builtin_attr_safety, attr_safety) { + match (expected_safety, attr_safety) { // - Unsafe builtin attribute // - User wrote `#[unsafe(..)]`, which is permitted on any edition - (Some(AttributeSafety::Unsafe { .. }), Safety::Unsafe(..)) => { + (AttributeSafety::Unsafe { .. }, Safety::Unsafe(..)) => { // OK } // - Unsafe builtin attribute // - User did not write `#[unsafe(..)]` - (Some(AttributeSafety::Unsafe { unsafe_since }), Safety::Default) => { + (AttributeSafety::Unsafe { unsafe_since }, Safety::Default) => { let path_span = attr_path.span; // If the `attr_item`'s span is not from a macro, then just suggest @@ -95,7 +90,7 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> { // - Normal builtin attribute // - Writing `#[unsafe(..)]` is not permitted on normal builtin attributes - (None | Some(AttributeSafety::Normal), Safety::Unsafe(unsafe_span)) => { + (AttributeSafety::Normal, Safety::Unsafe(unsafe_span)) => { self.stage.emit_err( self.sess, crate::session_diagnostics::InvalidAttrUnsafe { @@ -107,14 +102,11 @@ impl<'sess, S: Stage> AttributeParser<'sess, S> { // - Normal builtin attribute // - No explicit `#[unsafe(..)]` written. - (None | Some(AttributeSafety::Normal), Safety::Default) => { + (AttributeSafety::Normal, Safety::Default) => { // OK } - ( - Some(AttributeSafety::Unsafe { .. } | AttributeSafety::Normal) | None, - Safety::Safe(..), - ) => { + (_, Safety::Safe(..)) => { self.sess.dcx().span_delayed_bug( attr_span, "`check_attribute_safety` does not expect `Safety::Safe` on attributes", diff --git a/compiler/rustc_builtin_macros/src/cfg.rs b/compiler/rustc_builtin_macros/src/cfg.rs index c4a458089f2d2..2872cff0fdc7a 100644 --- a/compiler/rustc_builtin_macros/src/cfg.rs +++ b/compiler/rustc_builtin_macros/src/cfg.rs @@ -6,7 +6,8 @@ use rustc_ast::tokenstream::TokenStream; use rustc_ast::{AttrStyle, token}; use rustc_attr_parsing::parser::{AllowExprMetavar, MetaItemOrLitParser}; use rustc_attr_parsing::{ - self as attr, AttributeParser, CFG_TEMPLATE, ParsedDescription, ShouldEmit, parse_cfg_entry, + self as attr, AttributeParser, AttributeSafety, CFG_TEMPLATE, ParsedDescription, ShouldEmit, + parse_cfg_entry, }; use rustc_expand::base::{DummyResult, ExpandResult, ExtCtxt, MacEager, MacroExpanderResult}; use rustc_hir::attrs::CfgEntry; @@ -53,6 +54,7 @@ fn parse_cfg(cx: &ExtCtxt<'_>, span: Span, tts: TokenStream) -> Result StripUnconfigured<'a> { parse_cfg, &CFG_TEMPLATE, AllowExprMetavar::Yes, + AttributeSafety::Normal, ) else { // Cfg attribute was not parsable, give up return EvalConfigResult::True; diff --git a/compiler/rustc_expand/src/expand.rs b/compiler/rustc_expand/src/expand.rs index e3a15f193e581..4bbbe1706e9af 100644 --- a/compiler/rustc_expand/src/expand.rs +++ b/compiler/rustc_expand/src/expand.rs @@ -15,8 +15,8 @@ use rustc_ast::{ use rustc_ast_pretty::pprust; use rustc_attr_parsing::parser::AllowExprMetavar; use rustc_attr_parsing::{ - AttributeParser, CFG_TEMPLATE, Early, EvalConfigResult, ShouldEmit, eval_config_entry, - parse_cfg, validate_attr, + AttributeParser, AttributeSafety, CFG_TEMPLATE, Early, EvalConfigResult, ShouldEmit, + eval_config_entry, parse_cfg, validate_attr, }; use rustc_data_structures::flat_map_in_place::FlatMapInPlace; use rustc_data_structures::stack::ensure_sufficient_stack; @@ -2310,6 +2310,7 @@ impl<'a, 'b> InvocationCollector<'a, 'b> { parse_cfg, &CFG_TEMPLATE, AllowExprMetavar::Yes, + AttributeSafety::Normal, ) else { // Cfg attribute was not parsable, give up return EvalConfigResult::True; diff --git a/compiler/rustc_feature/src/builtin_attrs.rs b/compiler/rustc_feature/src/builtin_attrs.rs index db29b19b78cfd..a3782a7990b0a 100644 --- a/compiler/rustc_feature/src/builtin_attrs.rs +++ b/compiler/rustc_feature/src/builtin_attrs.rs @@ -5,7 +5,6 @@ use std::sync::LazyLock; use AttributeGate::*; use rustc_data_structures::fx::FxHashMap; use rustc_hir::AttrStyle; -use rustc_span::edition::Edition; use rustc_span::{Symbol, sym}; use crate::Features; @@ -70,18 +69,6 @@ pub fn find_gated_cfg(pred: impl Fn(Symbol) -> bool) -> Option<&'static GatedCfg // move that documentation into the relevant place in the other docs, and // remove the chapter on the flag. -#[derive(Copy, Clone, PartialEq, Debug)] -pub enum AttributeSafety { - /// Normal attribute that does not need `#[unsafe(...)]` - Normal, - /// Unsafe attribute that requires safety obligations to be discharged. - /// - /// An error is emitted when `#[unsafe(...)]` is omitted, except when the attribute's edition - /// is less than the one stored in `unsafe_since`. This handles attributes that were safe in - /// earlier editions, but become unsafe in later ones. - Unsafe { unsafe_since: Option }, -} - #[derive(Clone, Debug, Copy)] pub enum AttributeGate { /// A gated attribute which requires a feature gate to be enabled. @@ -203,56 +190,15 @@ macro_rules! template { } macro_rules! ungated { - (unsafe($edition:ident) $attr:ident $(,)?) => { - BuiltinAttribute { - name: sym::$attr, - safety: AttributeSafety::Unsafe { unsafe_since: Some(Edition::$edition) }, - gate: Ungated, - } - }; - (unsafe $attr:ident $(,)?) => { - BuiltinAttribute { - name: sym::$attr, - safety: AttributeSafety::Unsafe { unsafe_since: None }, - gate: Ungated, - } - }; ($attr:ident $(,)?) => { - BuiltinAttribute { name: sym::$attr, safety: AttributeSafety::Normal, gate: Ungated } + BuiltinAttribute { name: sym::$attr, gate: Ungated } }; } macro_rules! gated { - (unsafe $attr:ident, $gate:ident, $message:expr $(,)?) => { - BuiltinAttribute { - name: sym::$attr, - safety: AttributeSafety::Unsafe { unsafe_since: None }, - - gate: Gated { - feature: sym::$gate, - message: $message, - check: Features::$gate, - notes: &[], - }, - } - }; - (unsafe $attr:ident, $message:expr $(,)?) => { - BuiltinAttribute { - name: sym::$attr, - safety: AttributeSafety::Unsafe { unsafe_since: None }, - - gate: Gated { - feature: sym::$attr, - message: $message, - check: Features::$attr, - notes: &[], - }, - } - }; ($attr:ident, $gate:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - safety: AttributeSafety::Normal, gate: Gated { feature: sym::$gate, @@ -265,7 +211,6 @@ macro_rules! gated { ($attr:ident, $message:expr $(,)?) => { BuiltinAttribute { name: sym::$attr, - safety: AttributeSafety::Normal, gate: Gated { feature: sym::$attr, @@ -278,7 +223,7 @@ macro_rules! gated { } macro_rules! rustc_attr { - (TEST, $attr:ident, $(,)?) => { + (TEST, $attr:ident $(,)?) => { rustc_attr!( $attr, concat!( "the `#[", @@ -287,10 +232,9 @@ macro_rules! rustc_attr { ), ) }; - ($attr:ident, $($notes:expr),* $(,)?) => { + ($attr:ident $(, $notes:expr)* $(,)?) => { BuiltinAttribute { name: sym::$attr, - safety: AttributeSafety::Normal, gate: Gated { feature: sym::rustc_attrs, message: "use of an internal attribute", @@ -314,7 +258,6 @@ macro_rules! experimental { pub struct BuiltinAttribute { pub name: Symbol, - pub safety: AttributeSafety, pub gate: AttributeGate, } @@ -326,98 +269,98 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // ========================================================================== // Conditional compilation: - ungated!(cfg,), - ungated!(cfg_attr,), + ungated!(cfg), + ungated!(cfg_attr), // Testing: - ungated!(ignore,), - ungated!(should_panic,), + ungated!(ignore), + ungated!(should_panic), // Macros: - ungated!(automatically_derived,), - ungated!(macro_use,), - ungated!(macro_escape,), // Deprecated synonym for `macro_use`. - ungated!(macro_export,), - ungated!(proc_macro,), - ungated!(proc_macro_derive,), - ungated!(proc_macro_attribute,), + ungated!(automatically_derived), + ungated!(macro_use), + ungated!(macro_escape), // Deprecated synonym for `macro_use`. + ungated!(macro_export), + ungated!(proc_macro), + ungated!(proc_macro_derive), + ungated!(proc_macro_attribute), // Lints: - ungated!(warn,), - ungated!(allow,), - ungated!(expect,), - ungated!(forbid,), - ungated!(deny,), - ungated!(must_use,), + ungated!(warn), + ungated!(allow), + ungated!(expect), + ungated!(forbid), + ungated!(deny), + ungated!(must_use), gated!(must_not_suspend, experimental!(must_not_suspend)), - ungated!(deprecated,), + ungated!(deprecated), // Crate properties: - ungated!(crate_name,), - ungated!(crate_type,), + ungated!(crate_name), + ungated!(crate_type), // ABI, linking, symbols, and FFI - ungated!(link,), - ungated!(link_name,), - ungated!(no_link,), - ungated!(repr,), + ungated!(link), + ungated!(link_name), + ungated!(no_link), + ungated!(repr), // FIXME(#82232, #143834): temporarily renamed to mitigate `#[align]` nameres ambiguity gated!(rustc_align,fn_align, experimental!(rustc_align)), gated!(rustc_align_static,static_align, experimental!(rustc_align_static)), - ungated!(unsafe(Edition2024) export_name,), - ungated!(unsafe(Edition2024) link_section,), - ungated!(unsafe(Edition2024) no_mangle,), - ungated!(used,), - ungated!(link_ordinal,), - ungated!(unsafe naked,), + ungated!(export_name), + ungated!(link_section), + ungated!(no_mangle), + ungated!(used), + ungated!(link_ordinal), + ungated!(naked), // See `TyAndLayout::pass_indirectly_in_non_rustic_abis` for details. rustc_attr!(rustc_pass_indirectly_in_non_rustic_abis, "types marked with `#[rustc_pass_indirectly_in_non_rustic_abis]` are always passed indirectly by non-Rustic ABIs"), // Limits: - ungated!(recursion_limit,), - ungated!(type_length_limit,), + ungated!(recursion_limit), + ungated!(type_length_limit), gated!( move_size_limit, large_assignments, experimental!(move_size_limit) ), // Entry point: - ungated!(no_main,), + ungated!(no_main), // Modules, prelude, and resolution: - ungated!(path,), - ungated!(no_std,), - ungated!(no_implicit_prelude,), - ungated!(non_exhaustive,), + ungated!(path), + ungated!(no_std), + ungated!(no_implicit_prelude), + ungated!(non_exhaustive), // Runtime - ungated!(windows_subsystem,), + ungated!(windows_subsystem), ungated!(// RFC 2070 - panic_handler,), + panic_handler), // Code generation: - ungated!(inline,), - ungated!(cold,), - ungated!(no_builtins,), - ungated!(target_feature,), - ungated!(track_caller,), - ungated!(instruction_set,), - gated!( - unsafe force_target_feature, + ungated!(inline), + ungated!(cold), + ungated!(no_builtins), + ungated!(target_feature), + ungated!(track_caller), + ungated!(instruction_set), + gated!( + force_target_feature, effective_target_features, experimental!(force_target_feature) ), gated!( sanitize, - sanitize, experimental!(sanitize),), + sanitize, experimental!(sanitize),), gated!( coverage, coverage_attribute, experimental!(coverage) ), - ungated!(doc,), + ungated!(doc), // Debugging - ungated!(debugger_visualizer,), - ungated!(collapse_debuginfo,), + ungated!(debugger_visualizer), + ungated!(collapse_debuginfo), // ========================================================================== // Unstable attributes: @@ -431,39 +374,43 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Testing: gated!( test_runner, custom_test_frameworks, - "custom test frameworks are an unstable feature",), + "custom test frameworks are an unstable feature" + ), gated!( reexport_test_harness_main, custom_test_frameworks, - "custom test frameworks are an unstable feature",), + "custom test frameworks are an unstable feature" + ), // RFC #1268 gated!( marker,marker_trait_attr, experimental!(marker) ), gated!( - thread_local,"`#[thread_local]` is an experimental feature, and does not currently handle destructors",), + thread_local,"`#[thread_local]` is an experimental feature, and does not currently handle destructors" + ), gated!( no_core, experimental!(no_core) ), // RFC 2412 gated!( optimize, - optimize_attribute, experimental!(optimize) + optimize_attribute, experimental!(optimize) ), gated!( - unsafe ffi_pure, experimental!(ffi_pure) + ffi_pure, experimental!(ffi_pure) ), gated!( - unsafe ffi_const, experimental!(ffi_const) + ffi_const, experimental!(ffi_const) ), gated!( - register_tool, experimental!(register_tool),), + register_tool, experimental!(register_tool) + ), // `#[cfi_encoding = ""]` gated!( cfi_encoding, - experimental!(cfi_encoding) + experimental!(cfi_encoding) ), // `#[coroutine]` attribute to be applied to closures to make them coroutines instead @@ -475,7 +422,7 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // `#[patchable_function_entry(prefix_nops = m, entry_nops = n)]` gated!( patchable_function_entry, - experimental!(patchable_function_entry) + experimental!(patchable_function_entry) ), // The `#[loop_match]` and `#[const_continue]` attributes are part of the @@ -501,14 +448,14 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes: Stability, deprecation, and unsafe: // ========================================================================== - ungated!(feature,), + ungated!(feature), // DuplicatesOk since it has its own validation - ungated!(stable,), - ungated!(unstable,), - ungated!(unstable_feature_bound,), - ungated!(rustc_const_unstable,), - ungated!(rustc_const_stable,), - ungated!(rustc_default_body_unstable,), + ungated!(stable), + ungated!(unstable), + ungated!(unstable_feature_bound), + ungated!(rustc_const_unstable), + ungated!(rustc_const_stable), + ungated!(rustc_default_body_unstable), gated!( allow_internal_unstable, "allow_internal_unstable side-steps feature gating and stability checks", @@ -525,10 +472,8 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ "rustc_allowed_through_unstable_modules special cases accidental stabilizations of stable items \ through unstable paths" ), - rustc_attr!(rustc_deprecated_safe_2024,"`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary", - ), - rustc_attr!(rustc_pub_transparent,"used internally to mark types with a `transparent` representation when it is guaranteed by the documentation", - ), + rustc_attr!(rustc_deprecated_safe_2024, "`#[rustc_deprecated_safe_2024]` is used to declare functions unsafe across the edition 2024 boundary"), + rustc_attr!(rustc_pub_transparent, "used internally to mark types with a `transparent` representation when it is guaranteed by the documentation"), // ========================================================================== @@ -538,7 +483,8 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ gated!(fundamental, experimental!(fundamental)), gated!( may_dangle, dropck_eyepatch, - "`may_dangle` has unstable semantics and may be removed in the future",), + "`may_dangle` has unstable semantics and may be removed in the future" + ), rustc_attr!(rustc_never_type_options, "`rustc_never_type_options` is used to experiment with never type fallback and work on \ @@ -549,12 +495,12 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ // Internal attributes: Runtime related: // ========================================================================== - rustc_attr!(rustc_allocator,), - rustc_attr!(rustc_nounwind,), - rustc_attr!(rustc_reallocator,), - rustc_attr!(rustc_deallocator,), - rustc_attr!(rustc_allocator_zeroed,), - rustc_attr!(rustc_allocator_zeroed_variant,), + rustc_attr!(rustc_allocator), + rustc_attr!(rustc_nounwind), + rustc_attr!(rustc_reallocator), + rustc_attr!(rustc_deallocator), + rustc_attr!(rustc_allocator_zeroed), + rustc_attr!(rustc_allocator_zeroed_variant), gated!( default_lib_allocator, allocator_internals, experimental!(default_lib_allocator), ), @@ -570,11 +516,13 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ gated!( compiler_builtins, "the `#[compiler_builtins]` attribute is used to identify the `compiler_builtins` crate \ - which contains compiler-rt intrinsics and will never be stable",), + which contains compiler-rt intrinsics and will never be stable" + ), gated!( profiler_runtime, "the `#[profiler_runtime]` attribute is used to identify the `profiler_builtins` crate \ - which contains the profiler runtime and will never be stable",), + which contains the profiler runtime and will never be stable" + ), // ========================================================================== // Internal attributes, Linkage: @@ -582,110 +530,96 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ gated!( linkage, - "the `linkage` attribute is experimental and not portable across platforms",), - rustc_attr!(rustc_std_internal_symbol,), - rustc_attr!(rustc_objc_class,), - rustc_attr!(rustc_objc_selector,), + "the `linkage` attribute is experimental and not portable across platforms" + ), + rustc_attr!(rustc_std_internal_symbol), + rustc_attr!(rustc_objc_class), + rustc_attr!(rustc_objc_selector), // ========================================================================== // Internal attributes, Macro related: // ========================================================================== - rustc_attr!(rustc_builtin_macro,), - rustc_attr!(rustc_proc_macro_decls,), - rustc_attr!(rustc_macro_transparency, - "used internally for testing macro hygiene",), - rustc_attr!(rustc_autodiff,), - rustc_attr!(rustc_offload_kernel,), + rustc_attr!(rustc_builtin_macro), + rustc_attr!(rustc_proc_macro_decls), + rustc_attr!(rustc_macro_transparency, "used internally for testing macro hygiene"), + rustc_attr!(rustc_autodiff), + rustc_attr!(rustc_offload_kernel), // Traces that are left when `cfg` and `cfg_attr` attributes are expanded. // The attributes are not gated, to avoid stability errors, but they cannot be used in stable // or unstable code directly because `sym::cfg_(attr_)trace` are not valid identifiers, they // can only be generated by the compiler. - ungated!(cfg_trace - ), - ungated!(cfg_attr_trace - ), + ungated!(cfg_trace), + ungated!(cfg_attr_trace), // ========================================================================== // Internal attributes, Diagnostics related: // ========================================================================== - rustc_attr!(rustc_on_unimplemented,"see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute" - ), - rustc_attr!(rustc_confusables,), + rustc_attr!(rustc_on_unimplemented, "see `#[diagnostic::on_unimplemented]` for the stable equivalent of this attribute"), + rustc_attr!(rustc_confusables), // Enumerates "identity-like" conversion methods to suggest on type mismatch. - rustc_attr!(rustc_conversion_suggestion,), + rustc_attr!(rustc_conversion_suggestion), // Prevents field reads in the marked trait or method to be considered // during dead code analysis. - rustc_attr!(rustc_trivial_field_reads,), + rustc_attr!(rustc_trivial_field_reads), // Used by the `rustc::potential_query_instability` lint to warn methods which // might not be stable during incremental compilation. - rustc_attr!(rustc_lint_query_instability,), + rustc_attr!(rustc_lint_query_instability), // Used by the `rustc::untracked_query_information` lint to warn methods which // might not be stable during incremental compilation. - rustc_attr!(rustc_lint_untracked_query_information,), + rustc_attr!(rustc_lint_untracked_query_information), // Used by the `rustc::bad_opt_access` lint to identify `DebuggingOptions` and `CodegenOptions` // types (as well as any others in future). - rustc_attr!(rustc_lint_opt_ty,), + rustc_attr!(rustc_lint_opt_ty), // Used by the `rustc::bad_opt_access` lint on fields // types (as well as any others in future). - rustc_attr!(rustc_lint_opt_deny_field_access,), + rustc_attr!(rustc_lint_opt_deny_field_access), // ========================================================================== // Internal attributes, Const related: // ========================================================================== - rustc_attr!(rustc_promotable,), - rustc_attr!(rustc_legacy_const_generics,), + rustc_attr!(rustc_promotable), + rustc_attr!(rustc_legacy_const_generics), // Do not const-check this function's body. It will always get replaced during CTFE via `hook_special_const_fn`. - rustc_attr!(rustc_do_not_const_check, "`#[rustc_do_not_const_check]` skips const-check for this function's body",), - rustc_attr!(rustc_const_stable_indirect, - "this is an internal implementation detail",), - rustc_attr!(rustc_intrinsic_const_stable_indirect, - "this is an internal implementation detail",), - rustc_attr!(rustc_allow_const_fn_unstable, - "rustc_allow_const_fn_unstable side-steps feature gating and stability checks" - ), + rustc_attr!(rustc_do_not_const_check, "`#[rustc_do_not_const_check]` skips const-check for this function's body"), + rustc_attr!(rustc_const_stable_indirect, "this is an internal implementation detail"), + rustc_attr!(rustc_intrinsic_const_stable_indirect, "this is an internal implementation detail"), + rustc_attr!(rustc_allow_const_fn_unstable, "rustc_allow_const_fn_unstable side-steps feature gating and stability checks"), // ========================================================================== // Internal attributes, Layout related: // ========================================================================== rustc_attr!(rustc_layout_scalar_valid_range_start, "the `#[rustc_layout_scalar_valid_range_start]` attribute is just used to enable \ - niche optimizations in the standard library",), + niche optimizations in the standard library"), rustc_attr!(rustc_layout_scalar_valid_range_end, "the `#[rustc_layout_scalar_valid_range_end]` attribute is just used to enable \ - niche optimizations in the standard library",), + niche optimizations in the standard library"), rustc_attr!(rustc_simd_monomorphize_lane_limit, "the `#[rustc_simd_monomorphize_lane_limit]` attribute is just used by std::simd \ - for better error messages",), + for better error messages"), rustc_attr!(rustc_nonnull_optimization_guaranteed, "the `#[rustc_nonnull_optimization_guaranteed]` attribute is just used to document \ guaranteed niche optimizations in the standard library", "the compiler does not even check whether the type indeed is being non-null-optimized; \ - it is your responsibility to ensure that the attribute is only used on types that are optimized",), + it is your responsibility to ensure that the attribute is only used on types that are optimized" + ), // ========================================================================== // Internal attributes, Misc: // ========================================================================== gated!( lang,lang_items, - "lang items are subject to change",), - rustc_attr!(rustc_as_ptr, "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations" - ), - rustc_attr!(rustc_should_not_be_called_on_const_items, "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts" - ), - rustc_attr!(rustc_pass_by_value, "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference" - ), - rustc_attr!(rustc_never_returns_null_ptr, "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers" - ), - rustc_attr!(rustc_no_implicit_autorefs, "`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument" - ), - rustc_attr!(rustc_coherence_is_core, "`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`" - ), - rustc_attr!(rustc_coinductive, "`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver" - ), - rustc_attr!(rustc_allow_incoherent_impl, "`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl" - ), - rustc_attr!(rustc_preserve_ub_checks, "`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR",), + "lang items are subject to change"), + rustc_attr!(rustc_as_ptr, "`#[rustc_as_ptr]` is used to mark functions returning pointers to their inner allocations"), + rustc_attr!(rustc_should_not_be_called_on_const_items, "`#[rustc_should_not_be_called_on_const_items]` is used to mark methods that don't make sense to be called on interior mutable consts"), + rustc_attr!(rustc_pass_by_value, "`#[rustc_pass_by_value]` is used to mark types that must be passed by value instead of reference"), + rustc_attr!(rustc_never_returns_null_ptr, "`#[rustc_never_returns_null_ptr]` is used to mark functions returning non-null pointers"), + rustc_attr!(rustc_no_implicit_autorefs, "`#[rustc_no_implicit_autorefs]` is used to mark functions for which an autoref to the dereference of a raw pointer should not be used as an argument"), + rustc_attr!(rustc_coherence_is_core, "`#![rustc_coherence_is_core]` allows inherent methods on builtin types, only intended to be used in `core`"), + rustc_attr!(rustc_coinductive, "`#[rustc_coinductive]` changes a trait to be coinductive, allowing cycles in the trait solver"), + rustc_attr!(rustc_allow_incoherent_impl, "`#[rustc_allow_incoherent_impl]` has to be added to all impl items of an incoherent inherent impl"), + rustc_attr!(rustc_preserve_ub_checks, "`#![rustc_preserve_ub_checks]` prevents the designated crate from evaluating whether UB checks are enabled when optimizing MIR"), rustc_attr!(rustc_deny_explicit_impl, "`#[rustc_deny_explicit_impl]` enforces that a trait can have no user-provided impls" ), @@ -702,7 +636,6 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ BuiltinAttribute { name: sym::rustc_diagnostic_item, - safety: AttributeSafety::Normal, gate: Gated { feature: sym::rustc_attrs, message: "use of an internal attribute", @@ -718,75 +651,87 @@ pub static BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[ gated!( rustc_paren_sugar,unboxed_closures, "unboxed_closures are still evolving", ), - rustc_attr!(rustc_inherit_overflow_checks,"the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ + rustc_attr!( + rustc_inherit_overflow_checks, + "the `#[rustc_inherit_overflow_checks]` attribute is just used to control \ overflow checking behavior of several functions in the standard library that are inlined \ - across crates",), - rustc_attr!(rustc_reservation_impl,"the `#[rustc_reservation_impl]` attribute is internally used \ + across crates" + ), + rustc_attr!( + rustc_reservation_impl, + "the `#[rustc_reservation_impl]` attribute is internally used \ for reserving `impl From for T` as part of the effort to stabilize `!`" ), - rustc_attr!(rustc_test_marker, "the `#[rustc_test_marker]` attribute is used internally to track tests",), - rustc_attr!(rustc_unsafe_specialization_marker, + rustc_attr!(rustc_test_marker, "the `#[rustc_test_marker]` attribute is used internally to track tests"), + rustc_attr!( + rustc_unsafe_specialization_marker, "the `#[rustc_unsafe_specialization_marker]` attribute is used to check specializations" ), - rustc_attr!(rustc_specialization_trait, + rustc_attr!( + rustc_specialization_trait, "the `#[rustc_specialization_trait]` attribute is used to check specializations" ), - rustc_attr!(rustc_main,"the `#[rustc_main]` attribute is used internally to specify test entry point function",), - rustc_attr!(rustc_skip_during_method_dispatch, "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ + rustc_attr!( + rustc_main, + "the `#[rustc_main]` attribute is used internally to specify test entry point function" + ), + rustc_attr!( + rustc_skip_during_method_dispatch, + "the `#[rustc_skip_during_method_dispatch]` attribute is used to exclude a trait \ from method dispatch when the receiver is of the following type, for compatibility in \ editions < 2021 (array) or editions < 2024 (boxed_slice)" ), - rustc_attr!(rustc_must_implement_one_of,"the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ + rustc_attr!(rustc_must_implement_one_of, "the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \ definition of a trait. Its syntax and semantics are highly experimental and will be \ subject to change before stabilization", ), - rustc_attr!(rustc_doc_primitive,"the `#[rustc_doc_primitive]` attribute is used by the standard library \ + rustc_attr!(rustc_doc_primitive, "the `#[rustc_doc_primitive]` attribute is used by the standard library \ to provide a way to generate documentation for primitive types", ), gated!( rustc_intrinsic,intrinsics, - "the `#[rustc_intrinsic]` attribute is used to declare intrinsics as function items",), - rustc_attr!(rustc_no_mir_inline,"`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen" + "the `#[rustc_intrinsic]` attribute is used to declare intrinsics as function items" ), - rustc_attr!(rustc_force_inline,"`#[rustc_force_inline]` forces a free function to be inlined"), - rustc_attr!(rustc_scalable_vector,"`#[rustc_scalable_vector]` defines a scalable vector type"), + rustc_attr!(rustc_no_mir_inline, "`#[rustc_no_mir_inline]` prevents the MIR inliner from inlining a function while not affecting codegen"), + rustc_attr!(rustc_force_inline, "`#[rustc_force_inline]` forces a free function to be inlined"), + rustc_attr!(rustc_scalable_vector, "`#[rustc_scalable_vector]` defines a scalable vector type"), // ========================================================================== // Internal attributes, Testing: // ========================================================================== - rustc_attr!(TEST, rustc_effective_visibility,), - rustc_attr!(TEST, rustc_dump_inferred_outlives,), - rustc_attr!(TEST, rustc_capture_analysis,), - rustc_attr!(TEST, rustc_insignificant_dtor,), - rustc_attr!(TEST, rustc_no_implicit_bounds,), - rustc_attr!(TEST, rustc_strict_coherence,), - rustc_attr!(TEST, rustc_dump_variances,), - rustc_attr!(TEST, rustc_dump_variances_of_opaques,), - rustc_attr!(TEST, rustc_hidden_type_of_opaques,), - rustc_attr!(TEST, rustc_layout,), - rustc_attr!(TEST, rustc_abi,), - rustc_attr!(TEST, rustc_regions,), - rustc_attr!(TEST, rustc_delayed_bug_from_inside_query,), - rustc_attr!(TEST, rustc_dump_user_args,), - rustc_attr!(TEST, rustc_evaluate_where_clauses,), - rustc_attr!(TEST, rustc_if_this_changed,), - rustc_attr!(TEST, rustc_then_this_would_need,), - rustc_attr!(TEST, rustc_clean,), - rustc_attr!(TEST, rustc_partition_reused,), - rustc_attr!(TEST, rustc_partition_codegened,), - rustc_attr!(TEST, rustc_expected_cgu_reuse,), - rustc_attr!(TEST, rustc_symbol_name,), - rustc_attr!(TEST, rustc_def_path,), - rustc_attr!(TEST, rustc_mir,), - gated!(custom_mir,"the `#[custom_mir]` attribute is just used for the Rust test suite",), - rustc_attr!(TEST, rustc_dump_item_bounds,), - rustc_attr!(TEST, rustc_dump_predicates,), - rustc_attr!(TEST, rustc_dump_def_parents,), - rustc_attr!(TEST, rustc_dump_object_lifetime_defaults,), - rustc_attr!(TEST, rustc_dump_vtable,), - rustc_attr!(TEST, rustc_dummy,), - rustc_attr!(TEST, pattern_complexity_limit,), + rustc_attr!(TEST, rustc_effective_visibility), + rustc_attr!(TEST, rustc_dump_inferred_outlives), + rustc_attr!(TEST, rustc_capture_analysis), + rustc_attr!(TEST, rustc_insignificant_dtor), + rustc_attr!(TEST, rustc_no_implicit_bounds), + rustc_attr!(TEST, rustc_strict_coherence), + rustc_attr!(TEST, rustc_dump_variances), + rustc_attr!(TEST, rustc_dump_variances_of_opaques), + rustc_attr!(TEST, rustc_hidden_type_of_opaques), + rustc_attr!(TEST, rustc_layout), + rustc_attr!(TEST, rustc_abi), + rustc_attr!(TEST, rustc_regions), + rustc_attr!(TEST, rustc_delayed_bug_from_inside_query), + rustc_attr!(TEST, rustc_dump_user_args), + rustc_attr!(TEST, rustc_evaluate_where_clauses), + rustc_attr!(TEST, rustc_if_this_changed), + rustc_attr!(TEST, rustc_then_this_would_need), + rustc_attr!(TEST, rustc_clean), + rustc_attr!(TEST, rustc_partition_reused), + rustc_attr!(TEST, rustc_partition_codegened), + rustc_attr!(TEST, rustc_expected_cgu_reuse), + rustc_attr!(TEST, rustc_symbol_name), + rustc_attr!(TEST, rustc_def_path), + rustc_attr!(TEST, rustc_mir), + gated!(custom_mir, "the `#[custom_mir]` attribute is just used for the Rust test suite"), + rustc_attr!(TEST, rustc_dump_item_bounds), + rustc_attr!(TEST, rustc_dump_predicates), + rustc_attr!(TEST, rustc_dump_def_parents), + rustc_attr!(TEST, rustc_dump_object_lifetime_defaults), + rustc_attr!(TEST, rustc_dump_vtable), + rustc_attr!(TEST, rustc_dummy), + rustc_attr!(TEST, pattern_complexity_limit), ]; pub fn is_builtin_attr_name(name: Symbol) -> bool { diff --git a/compiler/rustc_feature/src/lib.rs b/compiler/rustc_feature/src/lib.rs index 40a637bfa0b8f..5a7f33d50bc30 100644 --- a/compiler/rustc_feature/src/lib.rs +++ b/compiler/rustc_feature/src/lib.rs @@ -129,7 +129,7 @@ pub fn find_feature_issue(feature: Symbol, issue: GateIssue) -> Option Date: Sat, 4 Apr 2026 14:56:30 +0200 Subject: [PATCH 8/9] Remove unused attribute check for unparsed builtin attributes --- compiler/rustc_expand/src/errors.rs | 18 ------------------ compiler/rustc_expand/src/expand.rs | 19 ++----------------- compiler/rustc_expand/src/module.rs | 1 + 3 files changed, 3 insertions(+), 35 deletions(-) diff --git a/compiler/rustc_expand/src/errors.rs b/compiler/rustc_expand/src/errors.rs index 6c5732f497f8a..cee333e0a59fd 100644 --- a/compiler/rustc_expand/src/errors.rs +++ b/compiler/rustc_expand/src/errors.rs @@ -603,21 +603,3 @@ pub(crate) struct TrailingMacro { pub is_trailing: bool, pub name: Ident, } - -#[derive(Diagnostic)] -#[diag("unused attribute `{$attr_name}`")] -pub(crate) struct UnusedBuiltinAttribute { - #[note( - "the built-in attribute `{$attr_name}` will be ignored, since it's applied to the macro invocation `{$macro_name}`" - )] - pub invoc_span: Span, - pub attr_name: Symbol, - pub macro_name: String, - #[suggestion( - "remove the attribute", - code = "", - applicability = "machine-applicable", - style = "tool-only" - )] - pub attr_span: Span, -} diff --git a/compiler/rustc_expand/src/expand.rs b/compiler/rustc_expand/src/expand.rs index 4bbbe1706e9af..0ba87d6296b39 100644 --- a/compiler/rustc_expand/src/expand.rs +++ b/compiler/rustc_expand/src/expand.rs @@ -15,7 +15,7 @@ use rustc_ast::{ use rustc_ast_pretty::pprust; use rustc_attr_parsing::parser::AllowExprMetavar; use rustc_attr_parsing::{ - AttributeParser, AttributeSafety, CFG_TEMPLATE, Early, EvalConfigResult, ShouldEmit, + AttributeParser, AttributeSafety, CFG_TEMPLATE, EvalConfigResult, ShouldEmit, eval_config_entry, parse_cfg, validate_attr, }; use rustc_data_structures::flat_map_in_place::FlatMapInPlace; @@ -30,7 +30,7 @@ use rustc_parse::parser::{ RecoverColon, RecoverComma, Recovery, token_descr, }; use rustc_session::Session; -use rustc_session::lint::builtin::{UNUSED_ATTRIBUTES, UNUSED_DOC_COMMENTS}; +use rustc_session::lint::builtin::UNUSED_DOC_COMMENTS; use rustc_session::parse::feature_err; use rustc_span::hygiene::SyntaxContext; use rustc_span::{ErrorGuaranteed, FileName, Ident, LocalExpnId, Span, Symbol, sym}; @@ -2274,21 +2274,6 @@ impl<'a, 'b> InvocationCollector<'a, 'b> { self.cx.current_expansion.lint_node_id, crate::errors::MacroCallUnusedDocComment { span: attr.span }, ); - } else if rustc_attr_parsing::is_builtin_attr(attr) - && !AttributeParser::::is_parsed_attribute(&attr.path()) - { - let attr_name = attr.name().unwrap(); - self.cx.sess.psess.buffer_lint( - UNUSED_ATTRIBUTES, - attr.span, - self.cx.current_expansion.lint_node_id, - crate::errors::UnusedBuiltinAttribute { - attr_name, - macro_name: pprust::path_to_string(&call.path), - invoc_span: call.path.span, - attr_span: attr.span, - }, - ); } } } diff --git a/compiler/rustc_expand/src/module.rs b/compiler/rustc_expand/src/module.rs index 6f0ecfb1cf1c1..803803ec3f6cb 100644 --- a/compiler/rustc_expand/src/module.rs +++ b/compiler/rustc_expand/src/module.rs @@ -186,6 +186,7 @@ pub(crate) fn mod_file_path_from_attr( attrs: &[Attribute], dir_path: &Path, ) -> Option { + // FIXME(154781) use a parsed attribute here // Extract path string from first `#[path = "path_string"]` attribute. let first_path = attrs.iter().find(|at| at.has_name(sym::path))?; let Some(path_sym) = first_path.value_str() else { From 7c1eb8b85e8970cf021c0201ffbd74ed8d2dbe0b Mon Sep 17 00:00:00 2001 From: Jonathan Brouwer Date: Mon, 6 Apr 2026 17:22:35 +0200 Subject: [PATCH 9/9] CI debugging --- src/bootstrap/mk/Makefile.in | 2 +- src/ci/github-actions/jobs.yml | 2 ++ 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/src/bootstrap/mk/Makefile.in b/src/bootstrap/mk/Makefile.in index d675181f19411..984cc856799d3 100644 --- a/src/bootstrap/mk/Makefile.in +++ b/src/bootstrap/mk/Makefile.in @@ -114,7 +114,7 @@ TEST_SET2 := --skip=tests --skip=coverage-map --skip=coverage-run --skip=library ci-msvc-py: $(Q)$(CFG_SRC_DIR)/x.py test --stage 2 $(TEST_SET1) ci-msvc-ps1: - $(Q)$(CFG_SRC_DIR)/x.ps1 test --stage 2 $(TEST_SET2) + $(Q)$(CFG_SRC_DIR)/x.ps1 test --stage 2 $(TEST_SET2) --verbose --skip=compiler ci-msvc: ci-msvc-py ci-msvc-ps1 ## MingW native builders diff --git a/src/ci/github-actions/jobs.yml b/src/ci/github-actions/jobs.yml index 7c0f1d3f29305..d4312b2ee2dc7 100644 --- a/src/ci/github-actions/jobs.yml +++ b/src/ci/github-actions/jobs.yml @@ -572,6 +572,8 @@ auto: - name: i686-msvc-2 env: RUST_CONFIGURE_ARGS: --build=i686-pc-windows-msvc --enable-sanitizers + RUSTC_LOG: trace + BOOTSTRAP_TRACING: trace SCRIPT: make ci-msvc-ps1 <<: *job-windows