rustc_hir/attrs/
data_structures.rs

1use std::borrow::Cow;
2use std::path::PathBuf;
3
4pub use ReprAttr::*;
5use rustc_abi::Align;
6use rustc_ast::token::CommentKind;
7use rustc_ast::{AttrStyle, ast};
8use rustc_error_messages::{DiagArgValue, IntoDiagArg};
9use rustc_macros::{Decodable, Encodable, HashStable_Generic, PrintAttribute};
10use rustc_span::def_id::DefId;
11use rustc_span::hygiene::Transparency;
12use rustc_span::{Ident, Span, Symbol};
13pub use rustc_target::spec::SanitizerSet;
14use thin_vec::ThinVec;
15
16use crate::attrs::pretty_printing::PrintAttribute;
17use crate::limit::Limit;
18use crate::{DefaultBodyStability, PartialConstStability, RustcVersion, Stability};
19
20#[derive(Copy, Clone, PartialEq, Encodable, Decodable, Debug, HashStable_Generic, PrintAttribute)]
21pub enum InlineAttr {
22    None,
23    Hint,
24    Always,
25    Never,
26    /// `#[rustc_force_inline]` forces inlining to happen in the MIR inliner - it reports an error
27    /// if the inlining cannot happen. It is limited to only free functions so that the calls
28    /// can always be resolved.
29    Force {
30        attr_span: Span,
31        reason: Option<Symbol>,
32    },
33}
34
35impl InlineAttr {
36    pub fn always(&self) -> bool {
37        match self {
38            InlineAttr::Always | InlineAttr::Force { .. } => true,
39            InlineAttr::None | InlineAttr::Hint | InlineAttr::Never => false,
40        }
41    }
42}
43
44#[derive(Clone, Encodable, Decodable, Debug, PartialEq, Eq, HashStable_Generic)]
45pub enum InstructionSetAttr {
46    ArmA32,
47    ArmT32,
48}
49
50#[derive(Copy, Clone, Debug, PartialEq, Eq, Default, PrintAttribute)]
51#[derive(Encodable, Decodable, HashStable_Generic)]
52pub enum OptimizeAttr {
53    /// No `#[optimize(..)]` attribute
54    #[default]
55    Default,
56    /// `#[optimize(none)]`
57    DoNotOptimize,
58    /// `#[optimize(speed)]`
59    Speed,
60    /// `#[optimize(size)]`
61    Size,
62}
63
64impl OptimizeAttr {
65    pub fn do_not_optimize(&self) -> bool {
66        matches!(self, Self::DoNotOptimize)
67    }
68}
69
70#[derive(PartialEq, Debug, Encodable, Decodable, Copy, Clone, HashStable_Generic, PrintAttribute)]
71pub enum ReprAttr {
72    ReprInt(IntType),
73    ReprRust,
74    ReprC,
75    ReprPacked(Align),
76    ReprSimd,
77    ReprTransparent,
78    ReprAlign(Align),
79}
80
81pub enum TransparencyError {
82    UnknownTransparency(Symbol, Span),
83    MultipleTransparencyAttrs(Span, Span),
84}
85
86#[derive(Eq, PartialEq, Debug, Copy, Clone)]
87#[derive(Encodable, Decodable, HashStable_Generic, PrintAttribute)]
88pub enum IntType {
89    SignedInt(ast::IntTy),
90    UnsignedInt(ast::UintTy),
91}
92
93#[derive(Copy, Debug, Encodable, Decodable, Clone, HashStable_Generic, PrintAttribute)]
94pub struct Deprecation {
95    pub since: DeprecatedSince,
96    /// The note to issue a reason.
97    pub note: Option<Symbol>,
98    /// A text snippet used to completely replace any use of the deprecated item in an expression.
99    ///
100    /// This is currently unstable.
101    pub suggestion: Option<Symbol>,
102}
103
104/// Release in which an API is deprecated.
105#[derive(Copy, Debug, Encodable, Decodable, Clone, HashStable_Generic, PrintAttribute)]
106pub enum DeprecatedSince {
107    RustcVersion(RustcVersion),
108    /// Deprecated in the future ("to be determined").
109    Future,
110    /// `feature(staged_api)` is off. Deprecation versions outside the standard
111    /// library are allowed to be arbitrary strings, for better or worse.
112    NonStandard(Symbol),
113    /// Deprecation version is unspecified but optional.
114    Unspecified,
115    /// Failed to parse a deprecation version, or the deprecation version is
116    /// unspecified and required. An error has already been emitted.
117    Err,
118}
119
120/// Successfully-parsed value of a `#[coverage(..)]` attribute.
121#[derive(Copy, Debug, Eq, PartialEq, Encodable, Decodable, Clone)]
122#[derive(HashStable_Generic, PrintAttribute)]
123pub enum CoverageAttrKind {
124    On,
125    Off,
126}
127
128impl Deprecation {
129    /// Whether an item marked with #[deprecated(since = "X")] is currently
130    /// deprecated (i.e., whether X is not greater than the current rustc
131    /// version).
132    pub fn is_in_effect(&self) -> bool {
133        match self.since {
134            DeprecatedSince::RustcVersion(since) => since <= RustcVersion::CURRENT,
135            DeprecatedSince::Future => false,
136            // The `since` field doesn't have semantic purpose without `#![staged_api]`.
137            DeprecatedSince::NonStandard(_) => true,
138            // Assume deprecation is in effect if "since" field is absent or invalid.
139            DeprecatedSince::Unspecified | DeprecatedSince::Err => true,
140        }
141    }
142
143    pub fn is_since_rustc_version(&self) -> bool {
144        matches!(self.since, DeprecatedSince::RustcVersion(_))
145    }
146}
147
148/// There are three valid forms of the attribute:
149/// `#[used]`, which is equivalent to `#[used(linker)]` on targets that support it, but `#[used(compiler)]` if not.
150/// `#[used(compiler)]`
151/// `#[used(linker)]`
152#[derive(Encodable, Decodable, Copy, Clone, Debug, PartialEq, Eq, Hash)]
153#[derive(HashStable_Generic, PrintAttribute)]
154pub enum UsedBy {
155    Default,
156    Compiler,
157    Linker,
158}
159
160#[derive(Encodable, Decodable, Clone, Debug, PartialEq, Eq, Hash)]
161#[derive(HashStable_Generic, PrintAttribute)]
162pub enum MacroUseArgs {
163    UseAll,
164    UseSpecific(ThinVec<Ident>),
165}
166
167impl Default for MacroUseArgs {
168    fn default() -> Self {
169        Self::UseSpecific(ThinVec::new())
170    }
171}
172
173#[derive(Debug, Clone, Encodable, Decodable, HashStable_Generic)]
174pub struct StrippedCfgItem<ModId = DefId> {
175    pub parent_module: ModId,
176    pub ident: Ident,
177    pub cfg: (CfgEntry, Span),
178}
179
180impl<ModId> StrippedCfgItem<ModId> {
181    pub fn map_mod_id<New>(self, f: impl FnOnce(ModId) -> New) -> StrippedCfgItem<New> {
182        StrippedCfgItem { parent_module: f(self.parent_module), ident: self.ident, cfg: self.cfg }
183    }
184}
185
186#[derive(Encodable, Decodable, Clone, Debug, PartialEq, Eq, Hash)]
187#[derive(HashStable_Generic, PrintAttribute)]
188pub enum CfgEntry {
189    All(ThinVec<CfgEntry>, Span),
190    Any(ThinVec<CfgEntry>, Span),
191    Not(Box<CfgEntry>, Span),
192    Bool(bool, Span),
193    NameValue { name: Symbol, name_span: Span, value: Option<(Symbol, Span)>, span: Span },
194    Version(Option<RustcVersion>, Span),
195}
196
197/// Possible values for the `#[linkage]` attribute, allowing to specify the
198/// linkage type for a `MonoItem`.
199///
200/// See <https://llvm.org/docs/LangRef.html#linkage-types> for more details about these variants.
201#[derive(Encodable, Decodable, Clone, Copy, Debug, PartialEq, Eq, Hash)]
202#[derive(HashStable_Generic, PrintAttribute)]
203pub enum Linkage {
204    AvailableExternally,
205    Common,
206    ExternalWeak,
207    External,
208    Internal,
209    LinkOnceAny,
210    LinkOnceODR,
211    WeakAny,
212    WeakODR,
213}
214
215#[derive(Clone, Copy, Decodable, Debug, Encodable, PartialEq)]
216#[derive(HashStable_Generic, PrintAttribute)]
217pub enum MirDialect {
218    Analysis,
219    Built,
220    Runtime,
221}
222
223impl IntoDiagArg for MirDialect {
224    fn into_diag_arg(self, _path: &mut Option<PathBuf>) -> DiagArgValue {
225        let arg = match self {
226            MirDialect::Analysis => "analysis",
227            MirDialect::Built => "built",
228            MirDialect::Runtime => "runtime",
229        };
230        DiagArgValue::Str(Cow::Borrowed(arg))
231    }
232}
233
234#[derive(Clone, Copy, Decodable, Debug, Encodable, PartialEq)]
235#[derive(HashStable_Generic, PrintAttribute)]
236pub enum MirPhase {
237    Initial,
238    PostCleanup,
239    Optimized,
240}
241
242impl IntoDiagArg for MirPhase {
243    fn into_diag_arg(self, _path: &mut Option<PathBuf>) -> DiagArgValue {
244        let arg = match self {
245            MirPhase::Initial => "initial",
246            MirPhase::PostCleanup => "post-cleanup",
247            MirPhase::Optimized => "optimized",
248        };
249        DiagArgValue::Str(Cow::Borrowed(arg))
250    }
251}
252
253/// Different ways that the PE Format can decorate a symbol name.
254/// From <https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#import-name-type>
255#[derive(
256    Copy,
257    Clone,
258    Debug,
259    Encodable,
260    Decodable,
261    HashStable_Generic,
262    PartialEq,
263    Eq,
264    PrintAttribute
265)]
266pub enum PeImportNameType {
267    /// IMPORT_ORDINAL
268    /// Uses the ordinal (i.e., a number) rather than the name.
269    Ordinal(u16),
270    /// Same as IMPORT_NAME
271    /// Name is decorated with all prefixes and suffixes.
272    Decorated,
273    /// Same as IMPORT_NAME_NOPREFIX
274    /// Prefix (e.g., the leading `_` or `@`) is skipped, but suffix is kept.
275    NoPrefix,
276    /// Same as IMPORT_NAME_UNDECORATE
277    /// Prefix (e.g., the leading `_` or `@`) and suffix (the first `@` and all
278    /// trailing characters) are skipped.
279    Undecorated,
280}
281
282#[derive(
283    Copy,
284    Clone,
285    Debug,
286    PartialEq,
287    Eq,
288    PartialOrd,
289    Ord,
290    Hash,
291    Encodable,
292    Decodable,
293    PrintAttribute
294)]
295#[derive(HashStable_Generic)]
296pub enum NativeLibKind {
297    /// Static library (e.g. `libfoo.a` on Linux or `foo.lib` on Windows/MSVC)
298    Static {
299        /// Whether to bundle objects from static library into produced rlib
300        bundle: Option<bool>,
301        /// Whether to link static library without throwing any object files away
302        whole_archive: Option<bool>,
303    },
304    /// Dynamic library (e.g. `libfoo.so` on Linux)
305    /// or an import library corresponding to a dynamic library (e.g. `foo.lib` on Windows/MSVC).
306    Dylib {
307        /// Whether the dynamic library will be linked only if it satisfies some undefined symbols
308        as_needed: Option<bool>,
309    },
310    /// Dynamic library (e.g. `foo.dll` on Windows) without a corresponding import library.
311    /// On Linux, it refers to a generated shared library stub.
312    RawDylib {
313        /// Whether the dynamic library will be linked only if it satisfies some undefined symbols
314        as_needed: Option<bool>,
315    },
316    /// A macOS-specific kind of dynamic libraries.
317    Framework {
318        /// Whether the framework will be linked only if it satisfies some undefined symbols
319        as_needed: Option<bool>,
320    },
321    /// Argument which is passed to linker, relative order with libraries and other arguments
322    /// is preserved
323    LinkArg,
324
325    /// Module imported from WebAssembly
326    WasmImportModule,
327
328    /// The library kind wasn't specified, `Dylib` is currently used as a default.
329    Unspecified,
330}
331
332impl NativeLibKind {
333    pub fn has_modifiers(&self) -> bool {
334        match self {
335            NativeLibKind::Static { bundle, whole_archive } => {
336                bundle.is_some() || whole_archive.is_some()
337            }
338            NativeLibKind::Dylib { as_needed }
339            | NativeLibKind::Framework { as_needed }
340            | NativeLibKind::RawDylib { as_needed } => as_needed.is_some(),
341            NativeLibKind::Unspecified
342            | NativeLibKind::LinkArg
343            | NativeLibKind::WasmImportModule => false,
344        }
345    }
346
347    pub fn is_statically_included(&self) -> bool {
348        matches!(self, NativeLibKind::Static { .. })
349    }
350
351    pub fn is_dllimport(&self) -> bool {
352        matches!(
353            self,
354            NativeLibKind::Dylib { .. }
355                | NativeLibKind::RawDylib { .. }
356                | NativeLibKind::Unspecified
357        )
358    }
359}
360
361#[derive(Debug, Encodable, Decodable, Clone, HashStable_Generic, PrintAttribute)]
362pub struct LinkEntry {
363    pub span: Span,
364    pub kind: NativeLibKind,
365    pub name: Symbol,
366    pub cfg: Option<CfgEntry>,
367    pub verbatim: Option<bool>,
368    pub import_name_type: Option<(PeImportNameType, Span)>,
369}
370
371#[derive(HashStable_Generic, PrintAttribute)]
372#[derive(Copy, PartialEq, PartialOrd, Clone, Ord, Eq, Hash, Debug, Encodable, Decodable)]
373pub enum DebuggerVisualizerType {
374    Natvis,
375    GdbPrettyPrinter,
376}
377
378#[derive(Debug, Encodable, Decodable, Clone, HashStable_Generic, PrintAttribute)]
379pub struct DebugVisualizer {
380    pub span: Span,
381    pub visualizer_type: DebuggerVisualizerType,
382    pub path: Symbol,
383}
384
385/// Represents parsed *built-in* inert attributes.
386///
387/// ## Overview
388/// These attributes are markers that guide the compilation process and are never expanded into other code.
389/// They persist throughout the compilation phases, from AST to HIR and beyond.
390///
391/// ## Attribute Processing
392/// While attributes are initially parsed by [`rustc_parse`] into [`ast::Attribute`], they still contain raw token streams
393/// because different attributes have different internal structures. This enum represents the final,
394/// fully parsed form of these attributes, where each variant contains all the information and
395/// structure relevant for the specific attribute.
396///
397/// Some attributes can be applied multiple times to the same item, and they are "collapsed" into a single
398/// semantic attribute. For example:
399/// ```rust
400/// #[repr(C)]
401/// #[repr(packed)]
402/// struct S { }
403/// ```
404/// This is equivalent to `#[repr(C, packed)]` and results in a single [`AttributeKind::Repr`] containing
405/// both `C` and `packed` annotations. This collapsing happens during parsing and is reflected in the
406/// data structures defined in this enum.
407///
408/// ## Usage
409/// These parsed attributes are used throughout the compiler to:
410/// - Control code generation (e.g., `#[repr]`)
411/// - Mark API stability (`#[stable]`, `#[unstable]`)
412/// - Provide documentation (`#[doc]`)
413/// - Guide compiler behavior (e.g., `#[allow_internal_unstable]`)
414///
415/// ## Note on Attribute Organization
416/// Some attributes like `InlineAttr`, `OptimizeAttr`, and `InstructionSetAttr` are defined separately
417/// from this enum because they are used in specific compiler phases (like code generation) and don't
418/// need to persist throughout the entire compilation process. They are typically processed and
419/// converted into their final form earlier in the compilation pipeline.
420///
421/// For example:
422/// - `InlineAttr` is used during code generation to control function inlining
423/// - `OptimizeAttr` is used to control optimization levels
424/// - `InstructionSetAttr` is used for target-specific code generation
425///
426/// These attributes are handled by their respective compiler passes in the [`rustc_codegen_ssa`] crate
427/// and don't need to be preserved in the same way as the attributes in this enum.
428///
429/// For more details on attribute parsing, see the [`rustc_attr_parsing`] crate.
430///
431/// [`rustc_parse`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_parse/index.html
432/// [`rustc_codegen_ssa`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_ssa/index.html
433/// [`rustc_attr_parsing`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_attr_parsing/index.html
434#[derive(Clone, Debug, HashStable_Generic, Encodable, Decodable, PrintAttribute)]
435pub enum AttributeKind {
436    // tidy-alphabetical-start
437    /// Represents `#[align(N)]`.
438    // FIXME(#82232, #143834): temporarily renamed to mitigate `#[align]` nameres ambiguity
439    Align { align: Align, span: Span },
440
441    /// Represents `#[rustc_allow_const_fn_unstable]`.
442    AllowConstFnUnstable(ThinVec<Symbol>, Span),
443
444    /// Represents `#[rustc_allow_incoherent_impl]`.
445    AllowIncoherentImpl(Span),
446
447    /// Represents `#[allow_internal_unsafe]`.
448    AllowInternalUnsafe(Span),
449
450    /// Represents `#[allow_internal_unstable]`.
451    AllowInternalUnstable(ThinVec<(Symbol, Span)>, Span),
452
453    /// Represents `#[rustc_as_ptr]` (used by the `dangling_pointers_from_temporaries` lint).
454    AsPtr(Span),
455
456    /// Represents `#[automatically_derived]`
457    AutomaticallyDerived(Span),
458
459    /// Represents `#[rustc_default_body_unstable]`.
460    BodyStability {
461        stability: DefaultBodyStability,
462        /// Span of the `#[rustc_default_body_unstable(...)]` attribute
463        span: Span,
464    },
465
466    /// Represents `#[rustc_coinductive]`.
467    Coinductive(Span),
468
469    /// Represents `#[cold]`.
470    Cold(Span),
471
472    /// Represents `#[rustc_confusables]`.
473    Confusables {
474        symbols: ThinVec<Symbol>,
475        // FIXME(jdonszelmann): remove when target validation code is moved
476        first_span: Span,
477    },
478
479    /// Represents `#[const_continue]`.
480    ConstContinue(Span),
481
482    /// Represents `#[rustc_const_stable]` and `#[rustc_const_unstable]`.
483    ConstStability {
484        stability: PartialConstStability,
485        /// Span of the `#[rustc_const_stable(...)]` or `#[rustc_const_unstable(...)]` attribute
486        span: Span,
487    },
488
489    /// Represents `#[rustc_const_stable_indirect]`.
490    ConstStabilityIndirect,
491
492    /// Represents `#[const_trait]`.
493    ConstTrait(Span),
494
495    /// Represents `#[coroutine]`.
496    Coroutine(Span),
497
498    /// Represents `#[coverage(..)]`.
499    Coverage(Span, CoverageAttrKind),
500
501    /// Represents `#[crate_name = ...]`
502    CrateName { name: Symbol, name_span: Span, attr_span: Span },
503
504    /// Represents `#[custom_mir]`.
505    CustomMir(Option<(MirDialect, Span)>, Option<(MirPhase, Span)>, Span),
506
507    /// Represents `#[debugger_visualizer]`.
508    DebuggerVisualizer(ThinVec<DebugVisualizer>),
509
510    /// Represents `#[rustc_deny_explicit_impl]`.
511    DenyExplicitImpl(Span),
512
513    /// Represents [`#[deprecated]`](https://doc.rust-lang.org/stable/reference/attributes/diagnostics.html#the-deprecated-attribute).
514    Deprecation { deprecation: Deprecation, span: Span },
515
516    /// Represents `#[rustc_do_not_implement_via_object]`.
517    DoNotImplementViaObject(Span),
518
519    /// Represents [`#[doc = "..."]`](https://doc.rust-lang.org/stable/rustdoc/write-documentation/the-doc-attribute.html).
520    DocComment { style: AttrStyle, kind: CommentKind, span: Span, comment: Symbol },
521
522    /// Represents `#[rustc_dummy]`.
523    Dummy,
524
525    /// Represents [`#[export_name]`](https://doc.rust-lang.org/reference/abi.html#the-export_name-attribute).
526    ExportName {
527        /// The name to export this item with.
528        /// It may not contain \0 bytes as it will be converted to a null-terminated string.
529        name: Symbol,
530        span: Span,
531    },
532
533    /// Represents `#[export_stable]`.
534    ExportStable,
535
536    /// Represents `#[ffi_const]`.
537    FfiConst(Span),
538
539    /// Represents `#[ffi_pure]`.
540    FfiPure(Span),
541
542    /// Represents `#[fundamental]`.
543    Fundamental,
544
545    /// Represents `#[ignore]`
546    Ignore {
547        span: Span,
548        /// ignore can optionally have a reason: `#[ignore = "reason this is ignored"]`
549        reason: Option<Symbol>,
550    },
551
552    /// Represents `#[inline]` and `#[rustc_force_inline]`.
553    Inline(InlineAttr, Span),
554
555    /// Represents `#[link]`.
556    Link(ThinVec<LinkEntry>, Span),
557
558    /// Represents `#[link_name]`.
559    LinkName { name: Symbol, span: Span },
560
561    /// Represents `#[link_ordinal]`.
562    LinkOrdinal { ordinal: u16, span: Span },
563
564    /// Represents [`#[link_section]`](https://doc.rust-lang.org/reference/abi.html#the-link_section-attribute)
565    LinkSection { name: Symbol, span: Span },
566
567    /// Represents `#[linkage]`.
568    Linkage(Linkage, Span),
569
570    /// Represents `#[loop_match]`.
571    LoopMatch(Span),
572
573    /// Represents `#[macro_escape]`.
574    MacroEscape(Span),
575
576    /// Represents [`#[macro_export]`](https://doc.rust-lang.org/reference/macros-by-example.html#r-macro.decl.scope.path).
577    MacroExport { span: Span, local_inner_macros: bool },
578
579    /// Represents `#[rustc_macro_transparency]`.
580    MacroTransparency(Transparency),
581
582    /// Represents `#[macro_use]`.
583    MacroUse { span: Span, arguments: MacroUseArgs },
584
585    /// Represents `#[marker]`.
586    Marker(Span),
587
588    /// Represents [`#[may_dangle]`](https://std-dev-guide.rust-lang.org/tricky/may-dangle.html).
589    MayDangle(Span),
590
591    /// Represents `#[move_size_limit]`
592    MoveSizeLimit { attr_span: Span, limit_span: Span, limit: Limit },
593
594    /// Represents `#[must_use]`.
595    MustUse {
596        span: Span,
597        /// must_use can optionally have a reason: `#[must_use = "reason this must be used"]`
598        reason: Option<Symbol>,
599    },
600
601    /// Represents `#[naked]`
602    Naked(Span),
603
604    /// Represents `#[no_core]`
605    NoCore(Span),
606
607    /// Represents `#[no_implicit_prelude]`
608    NoImplicitPrelude(Span),
609
610    /// Represents `#[no_mangle]`
611    NoMangle(Span),
612
613    /// Represents `#[no_std]`
614    NoStd(Span),
615
616    /// Represents `#[non_exhaustive]`
617    NonExhaustive(Span),
618
619    /// Represents `#[rustc_objc_class]`
620    ObjcClass { classname: Symbol, span: Span },
621
622    /// Represents `#[rustc_objc_selector]`
623    ObjcSelector { methname: Symbol, span: Span },
624
625    /// Represents `#[optimize(size|speed)]`
626    Optimize(OptimizeAttr, Span),
627
628    /// Represents `#[rustc_paren_sugar]`.
629    ParenSugar(Span),
630
631    /// Represents `#[rustc_pass_by_value]` (used by the `rustc_pass_by_value` lint).
632    PassByValue(Span),
633
634    /// Represents `#[path]`
635    Path(Symbol, Span),
636
637    /// Represents `#[pattern_complexity_limit]`
638    PatternComplexityLimit { attr_span: Span, limit_span: Span, limit: Limit },
639
640    /// Represents `#[pointee]`
641    Pointee(Span),
642
643    /// Represents `#[proc_macro]`
644    ProcMacro(Span),
645
646    /// Represents `#[proc_macro_attribute]`
647    ProcMacroAttribute(Span),
648
649    /// Represents `#[proc_macro_derive]`
650    ProcMacroDerive { trait_name: Symbol, helper_attrs: ThinVec<Symbol>, span: Span },
651
652    /// Represents `#[rustc_pub_transparent]` (used by the `repr_transparent_external_private_fields` lint).
653    PubTransparent(Span),
654
655    /// Represents [`#[recursion_limit]`](https://doc.rust-lang.org/reference/attributes/limits.html#the-recursion_limit-attribute)
656    RecursionLimit { attr_span: Span, limit_span: Span, limit: Limit },
657
658    /// Represents [`#[repr]`](https://doc.rust-lang.org/stable/reference/type-layout.html#representations).
659    Repr { reprs: ThinVec<(ReprAttr, Span)>, first_span: Span },
660
661    /// Represents `#[rustc_builtin_macro]`.
662    RustcBuiltinMacro { builtin_name: Option<Symbol>, helper_attrs: ThinVec<Symbol>, span: Span },
663
664    /// Represents `#[rustc_coherence_is_core]`
665    RustcCoherenceIsCore(Span),
666
667    /// Represents `#[rustc_layout_scalar_valid_range_end]`.
668    RustcLayoutScalarValidRangeEnd(Box<u128>, Span),
669
670    /// Represents `#[rustc_layout_scalar_valid_range_start]`.
671    RustcLayoutScalarValidRangeStart(Box<u128>, Span),
672
673    /// Represents `#[rustc_main]`.
674    RustcMain,
675
676    /// Represents `#[rustc_object_lifetime_default]`.
677    RustcObjectLifetimeDefault,
678
679    /// Represents `#[rustc_simd_monomorphize_lane_limit = "N"]`.
680    RustcSimdMonomorphizeLaneLimit(Limit),
681
682    /// Represents `#[sanitize]`
683    ///
684    /// the on set and off set are distjoint since there's a third option: unset.
685    /// a node may not set the sanitizer setting in which case it inherits from parents.
686    Sanitize { on_set: SanitizerSet, off_set: SanitizerSet, span: Span },
687
688    /// Represents `#[should_panic]`
689    ShouldPanic { reason: Option<Symbol>, span: Span },
690
691    /// Represents `#[rustc_skip_during_method_dispatch]`.
692    SkipDuringMethodDispatch { array: bool, boxed_slice: bool, span: Span },
693
694    /// Represents `#[rustc_specialization_trait]`.
695    SpecializationTrait(Span),
696
697    /// Represents `#[stable]`, `#[unstable]` and `#[rustc_allowed_through_unstable_modules]`.
698    Stability {
699        stability: Stability,
700        /// Span of the attribute.
701        span: Span,
702    },
703
704    /// Represents `#[rustc_std_internal_symbol]`.
705    StdInternalSymbol(Span),
706
707    /// Represents `#[target_feature(enable = "...")]` and
708    /// `#[unsafe(force_target_feature(enable = "...")]`.
709    TargetFeature { features: ThinVec<(Symbol, Span)>, attr_span: Span, was_forced: bool },
710
711    /// Represents `#[track_caller]`
712    TrackCaller(Span),
713
714    /// Represents `#[type_const]`.
715    TypeConst(Span),
716
717    /// Represents `#[type_length_limit]`
718    TypeLengthLimit { attr_span: Span, limit_span: Span, limit: Limit },
719
720    /// Represents `#[rustc_unsafe_specialization_marker]`.
721    UnsafeSpecializationMarker(Span),
722
723    /// Represents `#[unstable_feature_bound]`.
724    UnstableFeatureBound(ThinVec<(Symbol, Span)>),
725
726    /// Represents `#[used]`
727    Used { used_by: UsedBy, span: Span },
728    // tidy-alphabetical-end
729}
rustc_hir/attrs/data_structures.rs

rustc_hir/attrs/
data_structures.rs
