1 use std::cell::RefCell;
2 use std::default::Default;
3 use std::hash::{Hash, Hasher};
4 use std::lazy::SyncOnceCell as OnceCell;
5 use std::path::PathBuf;
10 use arrayvec::ArrayVec;
13 use rustc_ast::util::comments::beautify_doc_string;
14 use rustc_ast::{self as ast, AttrStyle};
15 use rustc_attr::{ConstStability, Deprecation, Stability, StabilityLevel};
16 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
17 use rustc_data_structures::thin_vec::ThinVec;
19 use rustc_hir::def::{CtorKind, DefKind, Res};
20 use rustc_hir::def_id::{CrateNum, DefId, DefIndex, CRATE_DEF_INDEX, LOCAL_CRATE};
21 use rustc_hir::lang_items::LangItem;
22 use rustc_hir::{BodyId, Mutability};
23 use rustc_index::vec::IndexVec;
24 use rustc_middle::ty::{self, TyCtxt};
25 use rustc_session::Session;
26 use rustc_span::hygiene::MacroKind;
27 use rustc_span::source_map::DUMMY_SP;
28 use rustc_span::symbol::{kw, sym, Ident, Symbol};
29 use rustc_span::{self, FileName, Loc};
30 use rustc_target::abi::VariantIdx;
31 use rustc_target::spec::abi::Abi;
33 use crate::clean::cfg::Cfg;
34 use crate::clean::external_path;
35 use crate::clean::inline::{self, print_inlined_const};
36 use crate::clean::utils::{is_literal_expr, print_const_expr, print_evaluated_const};
37 use crate::clean::Clean;
38 use crate::core::DocContext;
39 use crate::formats::cache::Cache;
40 use crate::formats::item_type::ItemType;
41 use crate::html::render::cache::ExternalLocation;
42 use crate::html::render::Context;
44 crate use self::FnRetTy::*;
45 crate use self::ItemKind::*;
46 crate use self::SelfTy::*;
47 crate use self::Type::{
48 Array, BareFunction, BorrowedRef, DynTrait, Generic, ImplTrait, Infer, Primitive, QPath,
49 RawPointer, Slice, Tuple,
51 crate use self::Visibility::{Inherited, Public};
53 crate type ItemIdSet = FxHashSet<ItemId>;
55 #[derive(Debug, Clone, PartialEq, Eq, Hash, Copy)]
57 /// A "normal" item that uses a [`DefId`] for identification.
59 /// Identifier that is used for auto traits.
60 Auto { trait_: DefId, for_: DefId },
61 /// Identifier that is used for blanket implementations.
62 Blanket { impl_id: DefId, for_: DefId },
63 /// Identifier for primitive types.
64 Primitive(PrimitiveType, CrateNum),
69 crate fn is_local(self) -> bool {
71 ItemId::Auto { for_: id, .. }
72 | ItemId::Blanket { for_: id, .. }
73 | ItemId::DefId(id) => id.is_local(),
74 ItemId::Primitive(_, krate) => krate == LOCAL_CRATE,
80 crate fn expect_def_id(self) -> DefId {
82 .unwrap_or_else(|| panic!("ItemId::expect_def_id: `{:?}` isn't a DefId", self))
86 crate fn as_def_id(self) -> Option<DefId> {
88 ItemId::DefId(id) => Some(id),
94 crate fn krate(self) -> CrateNum {
96 ItemId::Auto { for_: id, .. }
97 | ItemId::Blanket { for_: id, .. }
98 | ItemId::DefId(id) => id.krate,
99 ItemId::Primitive(_, krate) => krate,
104 crate fn index(self) -> Option<DefIndex> {
106 ItemId::DefId(id) => Some(id.index),
112 impl From<DefId> for ItemId {
113 fn from(id: DefId) -> Self {
118 /// The crate currently being documented.
119 #[derive(Clone, Debug)]
122 crate primitives: ThinVec<(DefId, PrimitiveType)>,
123 /// Only here so that they can be filtered through the rustdoc passes.
124 crate external_traits: Rc<RefCell<FxHashMap<DefId, TraitWithExtraInfo>>>,
127 // `Crate` is frequently moved by-value. Make sure it doesn't unintentionally get bigger.
128 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
129 rustc_data_structures::static_assert_size!(Crate, 72);
132 crate fn name(&self, tcx: TyCtxt<'_>) -> Symbol {
133 ExternalCrate::LOCAL.name(tcx)
136 crate fn src(&self, tcx: TyCtxt<'_>) -> FileName {
137 ExternalCrate::LOCAL.src(tcx)
141 /// This struct is used to wrap additional information added by rustdoc on a `trait` item.
142 #[derive(Clone, Debug)]
143 crate struct TraitWithExtraInfo {
145 crate is_notable: bool,
148 #[derive(Copy, Clone, Debug)]
149 crate struct ExternalCrate {
150 crate crate_num: CrateNum,
154 const LOCAL: Self = Self { crate_num: LOCAL_CRATE };
157 crate fn def_id(&self) -> DefId {
158 DefId { krate: self.crate_num, index: CRATE_DEF_INDEX }
161 crate fn src(&self, tcx: TyCtxt<'_>) -> FileName {
162 let krate_span = tcx.def_span(self.def_id());
163 tcx.sess.source_map().span_to_filename(krate_span)
166 crate fn name(&self, tcx: TyCtxt<'_>) -> Symbol {
167 tcx.crate_name(self.crate_num)
170 crate fn src_root(&self, tcx: TyCtxt<'_>) -> PathBuf {
171 match self.src(tcx) {
172 FileName::Real(ref p) => match p.local_path_if_available().parent() {
173 Some(p) => p.to_path_buf(),
174 None => PathBuf::new(),
180 /// Attempts to find where an external crate is located, given that we're
181 /// rendering in to the specified source destination.
184 extern_url: Option<&str>,
185 extern_url_takes_precedence: bool,
186 dst: &std::path::Path,
188 ) -> ExternalLocation {
189 use ExternalLocation::*;
191 fn to_remote(url: impl ToString) -> ExternalLocation {
192 let mut url = url.to_string();
193 if !url.ends_with('/') {
199 // See if there's documentation generated into the local directory
200 // WARNING: since rustdoc creates these directories as it generates documentation, this check is only accurate before rendering starts.
201 // Make sure to call `location()` by that time.
202 let local_location = dst.join(self.name(tcx).as_str());
203 if local_location.is_dir() {
207 if extern_url_takes_precedence {
208 if let Some(url) = extern_url {
209 return to_remote(url);
213 // Failing that, see if there's an attribute specifying where to find this
215 let did = DefId { krate: self.crate_num, index: CRATE_DEF_INDEX };
218 .filter(|a| a.has_name(sym::html_root_url))
219 .filter_map(|a| a.value_str())
222 .or_else(|| extern_url.map(to_remote)) // NOTE: only matters if `extern_url_takes_precedence` is false
223 .unwrap_or(Unknown) // Well, at least we tried.
226 crate fn keywords(&self, tcx: TyCtxt<'_>) -> ThinVec<(DefId, Symbol)> {
227 let root = self.def_id();
229 let as_keyword = |res: Res<!>| {
230 if let Res::Def(DefKind::Mod, def_id) = res {
231 let attrs = tcx.get_attrs(def_id);
232 let mut keyword = None;
233 for attr in attrs.lists(sym::doc) {
234 if attr.has_name(sym::keyword) {
235 if let Some(v) = attr.value_str() {
241 return keyword.map(|p| (def_id, p));
251 let item = tcx.hir().item(id);
253 hir::ItemKind::Mod(_) => {
254 as_keyword(Res::Def(DefKind::Mod, id.def_id.to_def_id()))
256 hir::ItemKind::Use(path, hir::UseKind::Single)
257 if tcx.visibility(id.def_id).is_public() =>
259 as_keyword(path.res.expect_non_local())
260 .map(|(_, prim)| (id.def_id.to_def_id(), prim))
267 tcx.item_children(root).iter().map(|item| item.res).filter_map(as_keyword).collect()
271 crate fn primitives(&self, tcx: TyCtxt<'_>) -> ThinVec<(DefId, PrimitiveType)> {
272 let root = self.def_id();
274 // Collect all inner modules which are tagged as implementations of
277 // Note that this loop only searches the top-level items of the crate,
278 // and this is intentional. If we were to search the entire crate for an
279 // item tagged with `#[doc(primitive)]` then we would also have to
280 // search the entirety of external modules for items tagged
281 // `#[doc(primitive)]`, which is a pretty inefficient process (decoding
282 // all that metadata unconditionally).
284 // In order to keep the metadata load under control, the
285 // `#[doc(primitive)]` feature is explicitly designed to only allow the
286 // primitive tags to show up as the top level items in a crate.
288 // Also note that this does not attempt to deal with modules tagged
289 // duplicately for the same primitive. This is handled later on when
290 // rendering by delegating everything to a hash map.
291 let as_primitive = |res: Res<!>| {
292 if let Res::Def(DefKind::Mod, def_id) = res {
293 let attrs = tcx.get_attrs(def_id);
295 for attr in attrs.lists(sym::doc) {
296 if let Some(v) = attr.value_str() {
297 if attr.has_name(sym::primitive) {
298 prim = PrimitiveType::from_symbol(v);
302 // FIXME: should warn on unknown primitives?
306 return prim.map(|p| (def_id, p));
317 let item = tcx.hir().item(id);
319 hir::ItemKind::Mod(_) => {
320 as_primitive(Res::Def(DefKind::Mod, id.def_id.to_def_id()))
322 hir::ItemKind::Use(path, hir::UseKind::Single)
323 if tcx.visibility(id.def_id).is_public() =>
325 as_primitive(path.res.expect_non_local()).map(|(_, prim)| {
326 // Pretend the primitive is local.
327 (id.def_id.to_def_id(), prim)
335 tcx.item_children(root).iter().map(|item| item.res).filter_map(as_primitive).collect()
340 /// Anything with a source location and set of attributes and, optionally, a
341 /// name. That is, anything that can be documented. This doesn't correspond
342 /// directly to the AST's concept of an item; it's a strict superset.
343 #[derive(Clone, Debug)]
345 /// The name of this item.
346 /// Optional because not every item has a name, e.g. impls.
347 crate name: Option<Symbol>,
348 crate attrs: Box<Attributes>,
349 crate visibility: Visibility,
350 /// Information about this item that is specific to what kind of item it is.
351 /// E.g., struct vs enum vs function.
352 crate kind: Box<ItemKind>,
353 crate def_id: ItemId,
355 crate cfg: Option<Arc<Cfg>>,
358 // `Item` is used a lot. Make sure it doesn't unintentionally get bigger.
359 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
360 rustc_data_structures::static_assert_size!(Item, 56);
362 crate fn rustc_span(def_id: DefId, tcx: TyCtxt<'_>) -> Span {
363 Span::new(def_id.as_local().map_or_else(
364 || tcx.def_span(def_id),
367 hir.span_with_body(hir.local_def_id_to_hir_id(local))
373 crate fn stability<'tcx>(&self, tcx: TyCtxt<'tcx>) -> Option<&'tcx Stability> {
374 self.def_id.as_def_id().and_then(|did| tcx.lookup_stability(did))
377 crate fn const_stability<'tcx>(&self, tcx: TyCtxt<'tcx>) -> Option<ConstStability> {
378 self.def_id.as_def_id().and_then(|did| tcx.lookup_const_stability(did)).map(|cs| *cs)
381 crate fn deprecation(&self, tcx: TyCtxt<'_>) -> Option<Deprecation> {
382 self.def_id.as_def_id().and_then(|did| tcx.lookup_deprecation(did))
385 crate fn inner_docs(&self, tcx: TyCtxt<'_>) -> bool {
386 self.def_id.as_def_id().map(|did| tcx.get_attrs(did).inner_docs()).unwrap_or(false)
389 crate fn span(&self, tcx: TyCtxt<'_>) -> Span {
390 let kind = match &*self.kind {
391 ItemKind::StrippedItem(k) => k,
395 ItemKind::ModuleItem(Module { span, .. }) => *span,
396 ItemKind::ImplItem(Impl { kind: ImplKind::Auto, .. }) => Span::dummy(),
397 ItemKind::ImplItem(Impl { kind: ImplKind::Blanket(_), .. }) => {
398 if let ItemId::Blanket { impl_id, .. } = self.def_id {
399 rustc_span(impl_id, tcx)
401 panic!("blanket impl item has non-blanket ID")
405 self.def_id.as_def_id().map(|did| rustc_span(did, tcx)).unwrap_or_else(Span::dummy)
410 crate fn attr_span(&self, tcx: TyCtxt<'_>) -> rustc_span::Span {
411 crate::passes::span_of_attrs(&self.attrs).unwrap_or_else(|| self.span(tcx).inner())
414 /// Finds the `doc` attribute as a NameValue and returns the corresponding
416 crate fn doc_value(&self) -> Option<String> {
417 self.attrs.doc_value()
420 /// Convenience wrapper around [`Self::from_def_id_and_parts`] which converts
421 /// `hir_id` to a [`DefId`]
422 pub fn from_hir_id_and_parts(
424 name: Option<Symbol>,
426 cx: &mut DocContext<'_>,
428 Item::from_def_id_and_parts(cx.tcx.hir().local_def_id(hir_id).to_def_id(), name, kind, cx)
431 pub fn from_def_id_and_parts(
433 name: Option<Symbol>,
435 cx: &mut DocContext<'_>,
437 let ast_attrs = cx.tcx.get_attrs(def_id);
439 Self::from_def_id_and_attrs_and_parts(
443 box ast_attrs.clean(cx),
445 ast_attrs.cfg(cx.tcx, &cx.cache.hidden_cfg),
449 pub fn from_def_id_and_attrs_and_parts(
451 name: Option<Symbol>,
453 attrs: Box<Attributes>,
454 cx: &mut DocContext<'_>,
455 cfg: Option<Arc<Cfg>>,
457 trace!("name={:?}, def_id={:?}", name, def_id);
460 def_id: def_id.into(),
464 visibility: cx.tcx.visibility(def_id).clean(cx),
469 /// Finds all `doc` attributes as NameValues and returns their corresponding values, joined
471 crate fn collapsed_doc_value(&self) -> Option<String> {
472 self.attrs.collapsed_doc_value()
475 crate fn links(&self, cx: &Context<'_>) -> Vec<RenderedLink> {
476 use crate::html::format::href;
481 .map_or(&[][..], |v| v.as_slice())
483 .filter_map(|ItemLink { link: s, link_text, did, ref fragment }| {
485 if let Ok((mut href, ..)) = href(*did, cx) {
487 if let Some(ref fragment) = *fragment {
489 href.push_str(fragment);
492 original_text: s.clone(),
493 new_text: link_text.clone(),
503 /// Find a list of all link names, without finding their href.
505 /// This is used for generating summary text, which does not include
506 /// the link text, but does need to know which `[]`-bracketed names
507 /// are actually links.
508 crate fn link_names(&self, cache: &Cache) -> Vec<RenderedLink> {
512 .map_or(&[][..], |v| v.as_slice())
514 .map(|ItemLink { link: s, link_text, .. }| RenderedLink {
515 original_text: s.clone(),
516 new_text: link_text.clone(),
522 crate fn is_crate(&self) -> bool {
523 self.is_mod() && self.def_id.as_def_id().map_or(false, |did| did.index == CRATE_DEF_INDEX)
525 crate fn is_mod(&self) -> bool {
526 self.type_() == ItemType::Module
528 crate fn is_trait(&self) -> bool {
529 self.type_() == ItemType::Trait
531 crate fn is_struct(&self) -> bool {
532 self.type_() == ItemType::Struct
534 crate fn is_enum(&self) -> bool {
535 self.type_() == ItemType::Enum
537 crate fn is_variant(&self) -> bool {
538 self.type_() == ItemType::Variant
540 crate fn is_associated_type(&self) -> bool {
541 self.type_() == ItemType::AssocType
543 crate fn is_associated_const(&self) -> bool {
544 self.type_() == ItemType::AssocConst
546 crate fn is_method(&self) -> bool {
547 self.type_() == ItemType::Method
549 crate fn is_ty_method(&self) -> bool {
550 self.type_() == ItemType::TyMethod
552 crate fn is_typedef(&self) -> bool {
553 self.type_() == ItemType::Typedef
555 crate fn is_primitive(&self) -> bool {
556 self.type_() == ItemType::Primitive
558 crate fn is_union(&self) -> bool {
559 self.type_() == ItemType::Union
561 crate fn is_import(&self) -> bool {
562 self.type_() == ItemType::Import
564 crate fn is_extern_crate(&self) -> bool {
565 self.type_() == ItemType::ExternCrate
567 crate fn is_keyword(&self) -> bool {
568 self.type_() == ItemType::Keyword
570 crate fn is_stripped(&self) -> bool {
572 StrippedItem(..) => true,
573 ImportItem(ref i) => !i.should_be_displayed,
577 crate fn has_stripped_fields(&self) -> Option<bool> {
579 StructItem(ref _struct) => Some(_struct.fields_stripped),
580 UnionItem(ref union) => Some(union.fields_stripped),
581 VariantItem(Variant::Struct(ref vstruct)) => Some(vstruct.fields_stripped),
586 crate fn stability_class(&self, tcx: TyCtxt<'_>) -> Option<String> {
587 self.stability(tcx).as_ref().and_then(|s| {
588 let mut classes = Vec::with_capacity(2);
590 if s.level.is_unstable() {
591 classes.push("unstable");
594 // FIXME: what about non-staged API items that are deprecated?
595 if self.deprecation(tcx).is_some() {
596 classes.push("deprecated");
599 if !classes.is_empty() { Some(classes.join(" ")) } else { None }
603 crate fn stable_since(&self, tcx: TyCtxt<'_>) -> Option<Symbol> {
604 match self.stability(tcx)?.level {
605 StabilityLevel::Stable { since, .. } => Some(since),
606 StabilityLevel::Unstable { .. } => None,
610 crate fn const_stable_since(&self, tcx: TyCtxt<'_>) -> Option<Symbol> {
611 match self.const_stability(tcx)?.level {
612 StabilityLevel::Stable { since, .. } => Some(since),
613 StabilityLevel::Unstable { .. } => None,
617 crate fn is_non_exhaustive(&self) -> bool {
618 self.attrs.other_attrs.iter().any(|a| a.has_name(sym::non_exhaustive))
621 /// Returns a documentation-level item type from the item.
622 crate fn type_(&self) -> ItemType {
626 crate fn is_default(&self) -> bool {
628 ItemKind::MethodItem(_, Some(defaultness)) => {
629 defaultness.has_value() && !defaultness.is_final()
636 #[derive(Clone, Debug)]
637 crate enum ItemKind {
639 /// The crate's name, *not* the name it's imported as.
646 FunctionItem(Function),
648 TypedefItem(Typedef, bool /* is associated type */),
649 OpaqueTyItem(OpaqueTy),
651 ConstantItem(Constant),
653 TraitAliasItem(TraitAlias),
655 /// A method signature only. Used for required methods in traits (ie,
656 /// non-default-methods).
657 TyMethodItem(Function),
658 /// A method with a body.
659 MethodItem(Function, Option<hir::Defaultness>),
660 StructFieldItem(Type),
661 VariantItem(Variant),
662 /// `fn`s from an extern block
663 ForeignFunctionItem(Function),
664 /// `static`s from an extern block
665 ForeignStaticItem(Static),
666 /// `type`s from an extern block
669 ProcMacroItem(ProcMacro),
670 PrimitiveItem(PrimitiveType),
671 AssocConstItem(Type, Option<ConstantKind>),
672 /// An associated item in a trait or trait impl.
674 /// The bounds may be non-empty if there is a `where` clause.
675 /// The `Option<Type>` is the default concrete type (e.g. `trait Trait { type Target = usize; }`)
676 AssocTypeItem(Vec<GenericBound>, Option<Type>),
677 /// An item that has been stripped by a rustdoc pass
678 StrippedItem(Box<ItemKind>),
683 /// Some items contain others such as structs (for their fields) and Enums
684 /// (for their variants). This method returns those contained items.
685 crate fn inner_items(&self) -> impl Iterator<Item = &Item> {
687 StructItem(s) => s.fields.iter(),
688 UnionItem(u) => u.fields.iter(),
689 VariantItem(Variant::Struct(v)) => v.fields.iter(),
690 VariantItem(Variant::Tuple(v)) => v.iter(),
691 EnumItem(e) => e.variants.iter(),
692 TraitItem(t) => t.items.iter(),
693 ImplItem(i) => i.items.iter(),
694 ModuleItem(m) => m.items.iter(),
695 ExternCrateItem { .. }
707 | ForeignFunctionItem(_)
708 | ForeignStaticItem(_)
713 | AssocConstItem(_, _)
714 | AssocTypeItem(_, _)
716 | KeywordItem(_) => [].iter(),
721 #[derive(Clone, Debug)]
722 crate struct Module {
723 crate items: Vec<Item>,
727 crate struct ListAttributesIter<'a> {
728 attrs: slice::Iter<'a, ast::Attribute>,
729 current_list: vec::IntoIter<ast::NestedMetaItem>,
733 impl<'a> Iterator for ListAttributesIter<'a> {
734 type Item = ast::NestedMetaItem;
736 fn next(&mut self) -> Option<Self::Item> {
737 if let Some(nested) = self.current_list.next() {
741 for attr in &mut self.attrs {
742 if let Some(list) = attr.meta_item_list() {
743 if attr.has_name(self.name) {
744 self.current_list = list.into_iter();
745 if let Some(nested) = self.current_list.next() {
755 fn size_hint(&self) -> (usize, Option<usize>) {
756 let lower = self.current_list.len();
761 crate trait AttributesExt {
762 /// Finds an attribute as List and returns the list of attributes nested inside.
763 fn lists(&self, name: Symbol) -> ListAttributesIter<'_>;
765 fn span(&self) -> Option<rustc_span::Span>;
767 fn inner_docs(&self) -> bool;
769 fn other_attrs(&self) -> Vec<ast::Attribute>;
771 fn cfg(&self, tcx: TyCtxt<'_>, hidden_cfg: &FxHashSet<Cfg>) -> Option<Arc<Cfg>>;
774 impl AttributesExt for [ast::Attribute] {
775 fn lists(&self, name: Symbol) -> ListAttributesIter<'_> {
776 ListAttributesIter { attrs: self.iter(), current_list: Vec::new().into_iter(), name }
779 /// Return the span of the first doc-comment, if it exists.
780 fn span(&self) -> Option<rustc_span::Span> {
781 self.iter().find(|attr| attr.doc_str().is_some()).map(|attr| attr.span)
784 /// Returns whether the first doc-comment is an inner attribute.
786 //// If there are no doc-comments, return true.
787 /// FIXME(#78591): Support both inner and outer attributes on the same item.
788 fn inner_docs(&self) -> bool {
789 self.iter().find(|a| a.doc_str().is_some()).map_or(true, |a| a.style == AttrStyle::Inner)
792 fn other_attrs(&self) -> Vec<ast::Attribute> {
793 self.iter().filter(|attr| attr.doc_str().is_none()).cloned().collect()
796 fn cfg(&self, tcx: TyCtxt<'_>, hidden_cfg: &FxHashSet<Cfg>) -> Option<Arc<Cfg>> {
798 let doc_cfg_active = tcx.features().doc_cfg;
799 let doc_auto_cfg_active = tcx.features().doc_auto_cfg;
801 fn single<T: IntoIterator>(it: T) -> Option<T::Item> {
802 let mut iter = it.into_iter();
803 let item = iter.next()?;
804 if iter.next().is_some() {
810 let mut cfg = if doc_cfg_active || doc_auto_cfg_active {
811 let mut doc_cfg = self
813 .filter(|attr| attr.has_name(sym::doc))
814 .flat_map(|attr| attr.meta_item_list().unwrap_or_else(Vec::new))
815 .filter(|attr| attr.has_name(sym::cfg))
817 if doc_cfg.peek().is_some() && doc_cfg_active {
819 .filter_map(|attr| Cfg::parse(attr.meta_item()?).ok())
820 .fold(Cfg::True, |cfg, new_cfg| cfg & new_cfg)
821 } else if doc_auto_cfg_active {
823 .filter(|attr| attr.has_name(sym::cfg))
824 .filter_map(|attr| single(attr.meta_item_list()?))
825 .filter_map(|attr| Cfg::parse(attr.meta_item()?).ok())
826 .filter(|cfg| !hidden_cfg.contains(cfg))
827 .fold(Cfg::True, |cfg, new_cfg| cfg & new_cfg)
835 for attr in self.iter() {
837 if attr.doc_str().is_none() && attr.has_name(sym::doc) {
839 if let Some(list) = attr.meta().as_ref().and_then(|mi| mi.meta_item_list()) {
842 if !item.has_name(sym::cfg) {
846 if let Some(cfg_mi) = item
848 .and_then(|item| rustc_expand::config::parse_cfg(item, sess))
850 match Cfg::parse(cfg_mi) {
851 Ok(new_cfg) => cfg &= new_cfg,
852 Err(e) => sess.span_err(e.span, e.msg),
860 // treat #[target_feature(enable = "feat")] attributes as if they were
861 // #[doc(cfg(target_feature = "feat"))] attributes as well
862 for attr in self.lists(sym::target_feature) {
863 if attr.has_name(sym::enable) {
864 if let Some(feat) = attr.value_str() {
865 let meta = attr::mk_name_value_item_str(
866 Ident::with_dummy_span(sym::target_feature),
870 if let Ok(feat_cfg) = Cfg::parse(&meta) {
877 if cfg == Cfg::True { None } else { Some(Arc::new(cfg)) }
881 crate trait NestedAttributesExt {
882 /// Returns `true` if the attribute list contains a specific `Word`
883 fn has_word(self, word: Symbol) -> bool;
884 fn get_word_attr(self, word: Symbol) -> Option<ast::NestedMetaItem>;
887 impl<I: Iterator<Item = ast::NestedMetaItem> + IntoIterator<Item = ast::NestedMetaItem>>
888 NestedAttributesExt for I
890 fn has_word(self, word: Symbol) -> bool {
891 self.into_iter().any(|attr| attr.is_word() && attr.has_name(word))
894 fn get_word_attr(mut self, word: Symbol) -> Option<ast::NestedMetaItem> {
895 self.find(|attr| attr.is_word() && attr.has_name(word))
899 /// A portion of documentation, extracted from a `#[doc]` attribute.
901 /// Each variant contains the line number within the complete doc-comment where the fragment
902 /// starts, as well as the Span where the corresponding doc comment or attribute is located.
904 /// Included files are kept separate from inline doc comments so that proper line-number
905 /// information can be given when a doctest fails. Sugared doc comments and "raw" doc comments are
906 /// kept separate because of issue #42760.
907 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
908 crate struct DocFragment {
909 crate span: rustc_span::Span,
910 /// The module this doc-comment came from.
912 /// This allows distinguishing between the original documentation and a pub re-export.
913 /// If it is `None`, the item was not re-exported.
914 crate parent_module: Option<DefId>,
916 crate kind: DocFragmentKind,
920 // `DocFragment` is used a lot. Make sure it doesn't unintentionally get bigger.
921 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
922 rustc_data_structures::static_assert_size!(DocFragment, 32);
924 #[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
925 crate enum DocFragmentKind {
926 /// A doc fragment created from a `///` or `//!` doc comment.
928 /// A doc fragment created from a "raw" `#[doc=""]` attribute.
932 /// The goal of this function is to apply the `DocFragment` transformation that is required when
933 /// transforming into the final Markdown, which is applying the computed indent to each line in
934 /// each doc fragment (a `DocFragment` can contain multiple lines in case of `#[doc = ""]`).
936 /// Note: remove the trailing newline where appropriate
937 fn add_doc_fragment(out: &mut String, frag: &DocFragment) {
938 let s = frag.doc.as_str();
939 let mut iter = s.lines();
944 while let Some(line) = iter.next() {
945 if line.chars().any(|c| !c.is_whitespace()) {
946 assert!(line.len() >= frag.indent);
947 out.push_str(&line[frag.indent..]);
955 /// Collapse a collection of [`DocFragment`]s into one string,
956 /// handling indentation and newlines as needed.
957 crate fn collapse_doc_fragments(doc_strings: &[DocFragment]) -> String {
958 let mut acc = String::new();
959 for frag in doc_strings {
960 add_doc_fragment(&mut acc, frag);
966 /// A link that has not yet been rendered.
968 /// This link will be turned into a rendered link by [`Item::links`].
969 #[derive(Clone, Debug, PartialEq, Eq, Hash)]
970 crate struct ItemLink {
971 /// The original link written in the markdown
972 pub(crate) link: String,
973 /// The link text displayed in the HTML.
975 /// This may not be the same as `link` if there was a disambiguator
976 /// in an intra-doc link (e.g. \[`fn@f`\])
977 pub(crate) link_text: String,
978 pub(crate) did: DefId,
979 /// The url fragment to append to the link
980 pub(crate) fragment: Option<String>,
983 pub struct RenderedLink {
984 /// The text the link was original written as.
986 /// This could potentially include disambiguators and backticks.
987 pub(crate) original_text: String,
988 /// The text to display in the HTML
989 pub(crate) new_text: String,
990 /// The URL to put in the `href`
991 pub(crate) href: String,
994 /// The attributes on an [`Item`], including attributes like `#[derive(...)]` and `#[inline]`,
995 /// as well as doc comments.
996 #[derive(Clone, Debug, Default)]
997 crate struct Attributes {
998 crate doc_strings: Vec<DocFragment>,
999 crate other_attrs: Vec<ast::Attribute>,
1003 crate fn lists(&self, name: Symbol) -> ListAttributesIter<'_> {
1004 self.other_attrs.lists(name)
1007 crate fn has_doc_flag(&self, flag: Symbol) -> bool {
1008 for attr in &self.other_attrs {
1009 if !attr.has_name(sym::doc) {
1013 if let Some(items) = attr.meta_item_list() {
1014 if items.iter().filter_map(|i| i.meta_item()).any(|it| it.has_name(flag)) {
1024 attrs: &[ast::Attribute],
1025 additional_attrs: Option<(&[ast::Attribute], DefId)>,
1027 let mut doc_strings: Vec<DocFragment> = vec![];
1028 let clean_attr = |(attr, parent_module): (&ast::Attribute, Option<DefId>)| {
1029 if let Some(value) = attr.doc_str() {
1030 trace!("got doc_str={:?}", value);
1031 let value = beautify_doc_string(value);
1032 let kind = if attr.is_doc_comment() {
1033 DocFragmentKind::SugaredDoc
1035 DocFragmentKind::RawDoc
1039 DocFragment { span: attr.span, doc: value, kind, parent_module, indent: 0 };
1041 doc_strings.push(frag);
1049 // Additional documentation should be shown before the original documentation
1050 let other_attrs = additional_attrs
1052 .map(|(attrs, id)| attrs.iter().map(move |attr| (attr, Some(id))))
1054 .chain(attrs.iter().map(|attr| (attr, None)))
1055 .filter_map(clean_attr)
1058 Attributes { doc_strings, other_attrs }
1061 /// Finds the `doc` attribute as a NameValue and returns the corresponding
1063 crate fn doc_value(&self) -> Option<String> {
1064 let mut iter = self.doc_strings.iter();
1066 let ori = iter.next()?;
1067 let mut out = String::new();
1068 add_doc_fragment(&mut out, ori);
1069 for new_frag in iter {
1070 if new_frag.kind != ori.kind || new_frag.parent_module != ori.parent_module {
1073 add_doc_fragment(&mut out, new_frag);
1076 if out.is_empty() { None } else { Some(out) }
1079 /// Return the doc-comments on this item, grouped by the module they came from.
1081 /// The module can be different if this is a re-export with added documentation.
1082 crate fn collapsed_doc_value_by_module_level(&self) -> FxHashMap<Option<DefId>, String> {
1083 let mut ret = FxHashMap::default();
1084 if self.doc_strings.len() == 0 {
1087 let last_index = self.doc_strings.len() - 1;
1089 for (i, new_frag) in self.doc_strings.iter().enumerate() {
1090 let out = ret.entry(new_frag.parent_module).or_default();
1091 add_doc_fragment(out, new_frag);
1092 if i == last_index {
1099 /// Finds all `doc` attributes as NameValues and returns their corresponding values, joined
1101 crate fn collapsed_doc_value(&self) -> Option<String> {
1102 if self.doc_strings.is_empty() {
1105 Some(collapse_doc_fragments(&self.doc_strings))
1109 crate fn get_doc_aliases(&self) -> Box<[Symbol]> {
1110 let mut aliases = FxHashSet::default();
1112 for attr in self.other_attrs.lists(sym::doc).filter(|a| a.has_name(sym::alias)) {
1113 if let Some(values) = attr.meta_item_list() {
1115 match l.literal().unwrap().kind {
1116 ast::LitKind::Str(s, _) => {
1119 _ => unreachable!(),
1123 aliases.insert(attr.value_str().unwrap());
1126 aliases.into_iter().collect::<Vec<_>>().into()
1130 impl PartialEq for Attributes {
1131 fn eq(&self, rhs: &Self) -> bool {
1132 self.doc_strings == rhs.doc_strings
1136 .map(|attr| attr.id)
1137 .eq(rhs.other_attrs.iter().map(|attr| attr.id))
1141 impl Eq for Attributes {}
1143 impl Hash for Attributes {
1144 fn hash<H: Hasher>(&self, hasher: &mut H) {
1145 self.doc_strings.hash(hasher);
1146 for attr in &self.other_attrs {
1147 attr.id.hash(hasher);
1152 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1153 crate enum GenericBound {
1154 TraitBound(PolyTrait, hir::TraitBoundModifier),
1159 crate fn maybe_sized(cx: &mut DocContext<'_>) -> GenericBound {
1160 let did = cx.tcx.require_lang_item(LangItem::Sized, None);
1161 let empty = cx.tcx.intern_substs(&[]);
1162 let path = external_path(cx, did, false, vec![], empty);
1163 inline::record_extern_fqn(cx, did, ItemType::Trait);
1164 GenericBound::TraitBound(
1165 PolyTrait { trait_: path, generic_params: Vec::new() },
1166 hir::TraitBoundModifier::Maybe,
1170 crate fn is_sized_bound(&self, cx: &DocContext<'_>) -> bool {
1171 use rustc_hir::TraitBoundModifier as TBM;
1172 if let GenericBound::TraitBound(PolyTrait { ref trait_, .. }, TBM::None) = *self {
1173 if Some(trait_.def_id()) == cx.tcx.lang_items().sized_trait() {
1180 crate fn get_poly_trait(&self) -> Option<PolyTrait> {
1181 if let GenericBound::TraitBound(ref p, _) = *self {
1182 return Some(p.clone());
1187 crate fn get_trait_path(&self) -> Option<Path> {
1188 if let GenericBound::TraitBound(PolyTrait { ref trait_, .. }, _) = *self {
1189 Some(trait_.clone())
1196 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1197 crate struct Lifetime(pub Symbol);
1200 crate fn statik() -> Lifetime {
1201 Lifetime(kw::StaticLifetime)
1204 crate fn elided() -> Lifetime {
1205 Lifetime(kw::UnderscoreLifetime)
1209 #[derive(Clone, Debug)]
1210 crate enum WherePredicate {
1211 BoundPredicate { ty: Type, bounds: Vec<GenericBound>, bound_params: Vec<Lifetime> },
1212 RegionPredicate { lifetime: Lifetime, bounds: Vec<GenericBound> },
1213 EqPredicate { lhs: Type, rhs: Type },
1216 impl WherePredicate {
1217 crate fn get_bounds(&self) -> Option<&[GenericBound]> {
1219 WherePredicate::BoundPredicate { ref bounds, .. } => Some(bounds),
1220 WherePredicate::RegionPredicate { ref bounds, .. } => Some(bounds),
1226 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1227 crate enum GenericParamDefKind {
1228 Lifetime { outlives: Vec<Lifetime> },
1229 Type { did: DefId, bounds: Vec<GenericBound>, default: Option<Box<Type>>, synthetic: bool },
1230 Const { did: DefId, ty: Box<Type>, default: Option<Box<String>> },
1233 impl GenericParamDefKind {
1234 crate fn is_type(&self) -> bool {
1235 matches!(self, GenericParamDefKind::Type { .. })
1239 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1240 crate struct GenericParamDef {
1242 crate kind: GenericParamDefKind,
1245 // `GenericParamDef` is used in many places. Make sure it doesn't unintentionally get bigger.
1246 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
1247 rustc_data_structures::static_assert_size!(GenericParamDef, 56);
1249 impl GenericParamDef {
1250 crate fn is_synthetic_type_param(&self) -> bool {
1252 GenericParamDefKind::Lifetime { .. } | GenericParamDefKind::Const { .. } => false,
1253 GenericParamDefKind::Type { synthetic, .. } => synthetic,
1257 crate fn is_type(&self) -> bool {
1261 crate fn get_bounds(&self) -> Option<&[GenericBound]> {
1263 GenericParamDefKind::Type { ref bounds, .. } => Some(bounds),
1269 // maybe use a Generic enum and use Vec<Generic>?
1270 #[derive(Clone, Debug, Default)]
1271 crate struct Generics {
1272 crate params: Vec<GenericParamDef>,
1273 crate where_predicates: Vec<WherePredicate>,
1276 #[derive(Clone, Debug)]
1277 crate struct Function {
1279 crate generics: Generics,
1280 crate header: hir::FnHeader,
1283 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1284 crate struct FnDecl {
1285 crate inputs: Arguments,
1286 crate output: FnRetTy,
1287 crate c_variadic: bool,
1291 crate fn self_type(&self) -> Option<SelfTy> {
1292 self.inputs.values.get(0).and_then(|v| v.to_self())
1295 /// Returns the sugared return type for an async function.
1297 /// For example, if the return type is `impl std::future::Future<Output = i32>`, this function
1298 /// will return `i32`.
1302 /// This function will panic if the return type does not match the expected sugaring for async
1304 crate fn sugared_async_return_type(&self) -> FnRetTy {
1305 match &self.output {
1306 FnRetTy::Return(Type::ImplTrait(bounds)) => match &bounds[0] {
1307 GenericBound::TraitBound(PolyTrait { trait_, .. }, ..) => {
1308 let bindings = trait_.bindings().unwrap();
1309 FnRetTy::Return(bindings[0].ty().clone())
1311 _ => panic!("unexpected desugaring of async function"),
1313 _ => panic!("unexpected desugaring of async function"),
1318 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1319 crate struct Arguments {
1320 crate values: Vec<Argument>,
1323 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1324 crate struct Argument {
1327 /// This field is used to represent "const" arguments from the `rustc_legacy_const_generics`
1328 /// feature. More information in <https://github.com/rust-lang/rust/issues/83167>.
1329 crate is_const: bool,
1332 #[derive(Clone, PartialEq, Debug)]
1335 SelfBorrowed(Option<Lifetime>, Mutability),
1340 crate fn to_self(&self) -> Option<SelfTy> {
1341 if self.name != kw::SelfLower {
1344 if self.type_.is_self_type() {
1345 return Some(SelfValue);
1348 BorrowedRef { ref lifetime, mutability, ref type_ } if type_.is_self_type() => {
1349 Some(SelfBorrowed(lifetime.clone(), mutability))
1351 _ => Some(SelfExplicit(self.type_.clone())),
1356 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1357 crate enum FnRetTy {
1363 crate fn as_return(&self) -> Option<&Type> {
1365 Return(ret) => Some(ret),
1366 DefaultReturn => None,
1371 #[derive(Clone, Debug)]
1372 crate struct Trait {
1373 crate unsafety: hir::Unsafety,
1374 crate items: Vec<Item>,
1375 crate generics: Generics,
1376 crate bounds: Vec<GenericBound>,
1377 crate is_auto: bool,
1380 #[derive(Clone, Debug)]
1381 crate struct TraitAlias {
1382 crate generics: Generics,
1383 crate bounds: Vec<GenericBound>,
1386 /// A trait reference, which may have higher ranked lifetimes.
1387 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1388 crate struct PolyTrait {
1390 crate generic_params: Vec<GenericParamDef>,
1393 /// Rustdoc's representation of types, mostly based on the [`hir::Ty`].
1394 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1396 /// A named type, which could be a trait.
1398 /// This is mostly Rustdoc's version of [`hir::Path`].
1399 /// It has to be different because Rustdoc's [`PathSegment`] can contain cleaned generics.
1400 Path { path: Path },
1401 /// A `dyn Trait` object: `dyn for<'a> Trait<'a> + Send + 'static`
1402 DynTrait(Vec<PolyTrait>, Option<Lifetime>),
1403 /// A type parameter.
1405 /// A primitive (aka, builtin) type.
1406 Primitive(PrimitiveType),
1407 /// A function pointer: `extern "ABI" fn(...) -> ...`
1408 BareFunction(Box<BareFunctionDecl>),
1409 /// A tuple type: `(i32, &str)`.
1411 /// A slice type (does *not* include the `&`): `[i32]`
1415 /// The `String` field is a stringified version of the array's length parameter.
1416 Array(Box<Type>, String),
1417 /// A raw pointer type: `*const i32`, `*mut i32`
1418 RawPointer(Mutability, Box<Type>),
1419 /// A reference type: `&i32`, `&'a mut Foo`
1420 BorrowedRef { lifetime: Option<Lifetime>, mutability: Mutability, type_: Box<Type> },
1422 /// A qualified path to an associated item: `<Type as Trait>::Name`
1425 self_type: Box<Type>,
1426 /// FIXME: This is a hack that should be removed; see [this discussion][1].
1428 /// [1]: https://github.com/rust-lang/rust/pull/85479#discussion_r635729093
1429 self_def_id: Option<DefId>,
1433 /// A type that is inferred: `_`
1436 /// An `impl Trait`: `impl TraitA + TraitB + ...`
1437 ImplTrait(Vec<GenericBound>),
1440 // `Type` is used a lot. Make sure it doesn't unintentionally get bigger.
1441 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
1442 rustc_data_structures::static_assert_size!(Type, 72);
1445 /// When comparing types for equality, it can help to ignore `&` wrapping.
1446 crate fn without_borrowed_ref(&self) -> &Type {
1447 let mut result = self;
1448 while let Type::BorrowedRef { type_, .. } = result {
1454 /// Check if two types are "potentially the same".
1455 /// This is different from `Eq`, because it knows that things like
1456 /// `Placeholder` are possible matches for everything.
1457 crate fn is_same(&self, other: &Self, cache: &Cache) -> bool {
1458 match (self, other) {
1460 (Type::Tuple(a), Type::Tuple(b)) => {
1461 a.len() == b.len() && a.iter().zip(b).all(|(a, b)| a.is_same(&b, cache))
1463 (Type::Slice(a), Type::Slice(b)) => a.is_same(&b, cache),
1464 (Type::Array(a, al), Type::Array(b, bl)) => al == bl && a.is_same(&b, cache),
1465 (Type::RawPointer(mutability, type_), Type::RawPointer(b_mutability, b_type_)) => {
1466 mutability == b_mutability && type_.is_same(&b_type_, cache)
1469 Type::BorrowedRef { mutability, type_, .. },
1470 Type::BorrowedRef { mutability: b_mutability, type_: b_type_, .. },
1471 ) => mutability == b_mutability && type_.is_same(&b_type_, cache),
1472 // Placeholders and generics are equal to all other types.
1473 (Type::Infer, _) | (_, Type::Infer) => true,
1474 (Type::Generic(_), _) | (_, Type::Generic(_)) => true,
1475 // Other cases, such as primitives, just use recursion.
1478 .and_then(|a| Some((a, b.def_id(cache)?)))
1479 .map(|(a, b)| a == b)
1484 crate fn primitive_type(&self) -> Option<PrimitiveType> {
1486 Primitive(p) | BorrowedRef { type_: box Primitive(p), .. } => Some(p),
1487 Slice(..) | BorrowedRef { type_: box Slice(..), .. } => Some(PrimitiveType::Slice),
1488 Array(..) | BorrowedRef { type_: box Array(..), .. } => Some(PrimitiveType::Array),
1491 Some(PrimitiveType::Unit)
1493 Some(PrimitiveType::Tuple)
1496 RawPointer(..) => Some(PrimitiveType::RawPointer),
1497 BareFunction(..) => Some(PrimitiveType::Fn),
1502 /// Checks if this is a `T::Name` path for an associated type.
1503 crate fn is_assoc_ty(&self) -> bool {
1505 Type::Path { path, .. } => path.is_assoc_ty(),
1510 crate fn is_self_type(&self) -> bool {
1512 Generic(name) => name == kw::SelfUpper,
1517 crate fn generics(&self) -> Option<Vec<&Type>> {
1519 Type::Path { path, .. } => path.generics(),
1524 crate fn is_full_generic(&self) -> bool {
1525 matches!(self, Type::Generic(_))
1528 crate fn is_primitive(&self) -> bool {
1529 self.primitive_type().is_some()
1532 crate fn projection(&self) -> Option<(&Type, DefId, Symbol)> {
1533 let (self_, trait_, name) = match self {
1534 QPath { self_type, trait_, name, .. } => (self_type, trait_, name),
1537 Some((&self_, trait_.def_id(), *name))
1540 fn inner_def_id(&self, cache: Option<&Cache>) -> Option<DefId> {
1541 let t: PrimitiveType = match *self {
1542 Type::Path { ref path } => return Some(path.def_id()),
1543 DynTrait(ref bounds, _) => return Some(bounds[0].trait_.def_id()),
1544 Primitive(p) => return cache.and_then(|c| c.primitive_locations.get(&p).cloned()),
1545 BorrowedRef { type_: box Generic(..), .. } => PrimitiveType::Reference,
1546 BorrowedRef { ref type_, .. } => return type_.inner_def_id(cache),
1551 PrimitiveType::Tuple
1554 BareFunction(..) => PrimitiveType::Fn,
1555 Slice(..) => PrimitiveType::Slice,
1556 Array(..) => PrimitiveType::Array,
1557 RawPointer(..) => PrimitiveType::RawPointer,
1558 QPath { ref self_type, .. } => return self_type.inner_def_id(cache),
1559 Generic(_) | Infer | ImplTrait(_) => return None,
1561 cache.and_then(|c| Primitive(t).def_id(c))
1564 /// Use this method to get the [DefId] of a [clean] AST node, including [PrimitiveType]s.
1566 /// See [`Self::def_id_no_primitives`] for more.
1568 /// [clean]: crate::clean
1569 crate fn def_id(&self, cache: &Cache) -> Option<DefId> {
1570 self.inner_def_id(Some(cache))
1573 /// Use this method to get the [`DefId`] of a [`clean`] AST node.
1574 /// This will return [`None`] when called on a primitive [`clean::Type`].
1575 /// Use [`Self::def_id`] if you want to include primitives.
1577 /// [`clean`]: crate::clean
1578 /// [`clean::Type`]: crate::clean::Type
1579 // FIXME: get rid of this function and always use `def_id`
1580 crate fn def_id_no_primitives(&self) -> Option<DefId> {
1581 self.inner_def_id(None)
1585 /// A primitive (aka, builtin) type.
1587 /// This represents things like `i32`, `str`, etc.
1589 /// N.B. This has to be different from [`hir::PrimTy`] because it also includes types that aren't
1590 /// paths, like [`Self::Unit`].
1591 #[derive(Clone, PartialEq, Eq, Hash, Copy, Debug)]
1592 crate enum PrimitiveType {
1620 impl PrimitiveType {
1621 crate fn from_hir(prim: hir::PrimTy) -> PrimitiveType {
1622 use ast::{FloatTy, IntTy, UintTy};
1624 hir::PrimTy::Int(IntTy::Isize) => PrimitiveType::Isize,
1625 hir::PrimTy::Int(IntTy::I8) => PrimitiveType::I8,
1626 hir::PrimTy::Int(IntTy::I16) => PrimitiveType::I16,
1627 hir::PrimTy::Int(IntTy::I32) => PrimitiveType::I32,
1628 hir::PrimTy::Int(IntTy::I64) => PrimitiveType::I64,
1629 hir::PrimTy::Int(IntTy::I128) => PrimitiveType::I128,
1630 hir::PrimTy::Uint(UintTy::Usize) => PrimitiveType::Usize,
1631 hir::PrimTy::Uint(UintTy::U8) => PrimitiveType::U8,
1632 hir::PrimTy::Uint(UintTy::U16) => PrimitiveType::U16,
1633 hir::PrimTy::Uint(UintTy::U32) => PrimitiveType::U32,
1634 hir::PrimTy::Uint(UintTy::U64) => PrimitiveType::U64,
1635 hir::PrimTy::Uint(UintTy::U128) => PrimitiveType::U128,
1636 hir::PrimTy::Float(FloatTy::F32) => PrimitiveType::F32,
1637 hir::PrimTy::Float(FloatTy::F64) => PrimitiveType::F64,
1638 hir::PrimTy::Str => PrimitiveType::Str,
1639 hir::PrimTy::Bool => PrimitiveType::Bool,
1640 hir::PrimTy::Char => PrimitiveType::Char,
1644 crate fn from_symbol(s: Symbol) -> Option<PrimitiveType> {
1646 sym::isize => Some(PrimitiveType::Isize),
1647 sym::i8 => Some(PrimitiveType::I8),
1648 sym::i16 => Some(PrimitiveType::I16),
1649 sym::i32 => Some(PrimitiveType::I32),
1650 sym::i64 => Some(PrimitiveType::I64),
1651 sym::i128 => Some(PrimitiveType::I128),
1652 sym::usize => Some(PrimitiveType::Usize),
1653 sym::u8 => Some(PrimitiveType::U8),
1654 sym::u16 => Some(PrimitiveType::U16),
1655 sym::u32 => Some(PrimitiveType::U32),
1656 sym::u64 => Some(PrimitiveType::U64),
1657 sym::u128 => Some(PrimitiveType::U128),
1658 sym::bool => Some(PrimitiveType::Bool),
1659 sym::char => Some(PrimitiveType::Char),
1660 sym::str => Some(PrimitiveType::Str),
1661 sym::f32 => Some(PrimitiveType::F32),
1662 sym::f64 => Some(PrimitiveType::F64),
1663 sym::array => Some(PrimitiveType::Array),
1664 sym::slice => Some(PrimitiveType::Slice),
1665 sym::tuple => Some(PrimitiveType::Tuple),
1666 sym::unit => Some(PrimitiveType::Unit),
1667 sym::pointer => Some(PrimitiveType::RawPointer),
1668 sym::reference => Some(PrimitiveType::Reference),
1669 kw::Fn => Some(PrimitiveType::Fn),
1670 sym::never => Some(PrimitiveType::Never),
1675 crate fn impls(&self, tcx: TyCtxt<'_>) -> &'static ArrayVec<DefId, 4> {
1676 Self::all_impls(tcx).get(self).expect("missing impl for primitive type")
1679 crate fn all_impls(tcx: TyCtxt<'_>) -> &'static FxHashMap<PrimitiveType, ArrayVec<DefId, 4>> {
1680 static CELL: OnceCell<FxHashMap<PrimitiveType, ArrayVec<DefId, 4>>> = OnceCell::new();
1682 CELL.get_or_init(move || {
1683 use self::PrimitiveType::*;
1685 let single = |a: Option<DefId>| a.into_iter().collect();
1686 let both = |a: Option<DefId>, b: Option<DefId>| -> ArrayVec<_, 4> {
1687 a.into_iter().chain(b).collect()
1690 let lang_items = tcx.lang_items();
1692 Isize => single(lang_items.isize_impl()),
1693 I8 => single(lang_items.i8_impl()),
1694 I16 => single(lang_items.i16_impl()),
1695 I32 => single(lang_items.i32_impl()),
1696 I64 => single(lang_items.i64_impl()),
1697 I128 => single(lang_items.i128_impl()),
1698 Usize => single(lang_items.usize_impl()),
1699 U8 => single(lang_items.u8_impl()),
1700 U16 => single(lang_items.u16_impl()),
1701 U32 => single(lang_items.u32_impl()),
1702 U64 => single(lang_items.u64_impl()),
1703 U128 => single(lang_items.u128_impl()),
1704 F32 => both(lang_items.f32_impl(), lang_items.f32_runtime_impl()),
1705 F64 => both(lang_items.f64_impl(), lang_items.f64_runtime_impl()),
1706 Char => single(lang_items.char_impl()),
1707 Bool => single(lang_items.bool_impl()),
1708 Str => both(lang_items.str_impl(), lang_items.str_alloc_impl()),
1713 .chain(lang_items.slice_u8_impl())
1714 .chain(lang_items.slice_alloc_impl())
1715 .chain(lang_items.slice_u8_alloc_impl())
1718 Array => single(lang_items.array_impl()),
1719 Tuple => ArrayVec::new(),
1720 Unit => ArrayVec::new(),
1725 .chain(lang_items.mut_ptr_impl())
1726 .chain(lang_items.const_slice_ptr_impl())
1727 .chain(lang_items.mut_slice_ptr_impl())
1730 Reference => ArrayVec::new(),
1731 Fn => ArrayVec::new(),
1732 Never => ArrayVec::new(),
1737 crate fn as_sym(&self) -> Symbol {
1738 use PrimitiveType::*;
1740 Isize => sym::isize,
1746 Usize => sym::usize,
1757 Array => sym::array,
1758 Slice => sym::slice,
1759 Tuple => sym::tuple,
1761 RawPointer => sym::pointer,
1762 Reference => sym::reference,
1764 Never => sym::never,
1768 /// Returns the DefId of the module with `doc(primitive)` for this primitive type.
1769 /// Panics if there is no such module.
1771 /// This gives precedence to primitives defined in the current crate, and deprioritizes primitives defined in `core`,
1772 /// but otherwise, if multiple crates define the same primitive, there is no guarantee of which will be picked.
1773 /// In particular, if a crate depends on both `std` and another crate that also defines `doc(primitive)`, then
1774 /// it's entirely random whether `std` or the other crate is picked. (no_std crates are usually fine unless multiple dependencies define a primitive.)
1775 crate fn primitive_locations(tcx: TyCtxt<'_>) -> &FxHashMap<PrimitiveType, DefId> {
1776 static PRIMITIVE_LOCATIONS: OnceCell<FxHashMap<PrimitiveType, DefId>> = OnceCell::new();
1777 PRIMITIVE_LOCATIONS.get_or_init(|| {
1778 let mut primitive_locations = FxHashMap::default();
1779 // NOTE: technically this misses crates that are only passed with `--extern` and not loaded when checking the crate.
1780 // This is a degenerate case that I don't plan to support.
1781 for &crate_num in tcx.crates(()) {
1782 let e = ExternalCrate { crate_num };
1783 let crate_name = e.name(tcx);
1784 debug!(?crate_num, ?crate_name);
1785 for &(def_id, prim) in &e.primitives(tcx) {
1786 // HACK: try to link to std instead where possible
1787 if crate_name == sym::core && primitive_locations.contains_key(&prim) {
1790 primitive_locations.insert(prim, def_id);
1793 let local_primitives = ExternalCrate { crate_num: LOCAL_CRATE }.primitives(tcx);
1794 for (def_id, prim) in local_primitives {
1795 primitive_locations.insert(prim, def_id);
1802 impl From<ast::IntTy> for PrimitiveType {
1803 fn from(int_ty: ast::IntTy) -> PrimitiveType {
1805 ast::IntTy::Isize => PrimitiveType::Isize,
1806 ast::IntTy::I8 => PrimitiveType::I8,
1807 ast::IntTy::I16 => PrimitiveType::I16,
1808 ast::IntTy::I32 => PrimitiveType::I32,
1809 ast::IntTy::I64 => PrimitiveType::I64,
1810 ast::IntTy::I128 => PrimitiveType::I128,
1815 impl From<ast::UintTy> for PrimitiveType {
1816 fn from(uint_ty: ast::UintTy) -> PrimitiveType {
1818 ast::UintTy::Usize => PrimitiveType::Usize,
1819 ast::UintTy::U8 => PrimitiveType::U8,
1820 ast::UintTy::U16 => PrimitiveType::U16,
1821 ast::UintTy::U32 => PrimitiveType::U32,
1822 ast::UintTy::U64 => PrimitiveType::U64,
1823 ast::UintTy::U128 => PrimitiveType::U128,
1828 impl From<ast::FloatTy> for PrimitiveType {
1829 fn from(float_ty: ast::FloatTy) -> PrimitiveType {
1831 ast::FloatTy::F32 => PrimitiveType::F32,
1832 ast::FloatTy::F64 => PrimitiveType::F64,
1837 impl From<ty::IntTy> for PrimitiveType {
1838 fn from(int_ty: ty::IntTy) -> PrimitiveType {
1840 ty::IntTy::Isize => PrimitiveType::Isize,
1841 ty::IntTy::I8 => PrimitiveType::I8,
1842 ty::IntTy::I16 => PrimitiveType::I16,
1843 ty::IntTy::I32 => PrimitiveType::I32,
1844 ty::IntTy::I64 => PrimitiveType::I64,
1845 ty::IntTy::I128 => PrimitiveType::I128,
1850 impl From<ty::UintTy> for PrimitiveType {
1851 fn from(uint_ty: ty::UintTy) -> PrimitiveType {
1853 ty::UintTy::Usize => PrimitiveType::Usize,
1854 ty::UintTy::U8 => PrimitiveType::U8,
1855 ty::UintTy::U16 => PrimitiveType::U16,
1856 ty::UintTy::U32 => PrimitiveType::U32,
1857 ty::UintTy::U64 => PrimitiveType::U64,
1858 ty::UintTy::U128 => PrimitiveType::U128,
1863 impl From<ty::FloatTy> for PrimitiveType {
1864 fn from(float_ty: ty::FloatTy) -> PrimitiveType {
1866 ty::FloatTy::F32 => PrimitiveType::F32,
1867 ty::FloatTy::F64 => PrimitiveType::F64,
1872 impl From<hir::PrimTy> for PrimitiveType {
1873 fn from(prim_ty: hir::PrimTy) -> PrimitiveType {
1875 hir::PrimTy::Int(int_ty) => int_ty.into(),
1876 hir::PrimTy::Uint(uint_ty) => uint_ty.into(),
1877 hir::PrimTy::Float(float_ty) => float_ty.into(),
1878 hir::PrimTy::Str => PrimitiveType::Str,
1879 hir::PrimTy::Bool => PrimitiveType::Bool,
1880 hir::PrimTy::Char => PrimitiveType::Char,
1885 #[derive(Copy, Clone, Debug)]
1886 crate enum Visibility {
1889 /// Visibility inherited from parent.
1891 /// For example, this is the visibility of private items and of enum variants.
1893 /// `pub(crate)`, `pub(super)`, or `pub(in path::to::somewhere)`
1898 crate fn is_public(&self) -> bool {
1899 matches!(self, Visibility::Public)
1903 #[derive(Clone, Debug)]
1904 crate struct Struct {
1905 crate struct_type: CtorKind,
1906 crate generics: Generics,
1907 crate fields: Vec<Item>,
1908 crate fields_stripped: bool,
1911 #[derive(Clone, Debug)]
1912 crate struct Union {
1913 crate generics: Generics,
1914 crate fields: Vec<Item>,
1915 crate fields_stripped: bool,
1918 /// This is a more limited form of the standard Struct, different in that
1919 /// it lacks the things most items have (name, id, parameterization). Found
1920 /// only as a variant in an enum.
1921 #[derive(Clone, Debug)]
1922 crate struct VariantStruct {
1923 crate struct_type: CtorKind,
1924 crate fields: Vec<Item>,
1925 crate fields_stripped: bool,
1928 #[derive(Clone, Debug)]
1930 crate variants: IndexVec<VariantIdx, Item>,
1931 crate generics: Generics,
1932 crate variants_stripped: bool,
1935 #[derive(Clone, Debug)]
1936 crate enum Variant {
1939 Struct(VariantStruct),
1942 /// Small wrapper around [`rustc_span::Span`] that adds helper methods
1943 /// and enforces calling [`rustc_span::Span::source_callsite()`].
1944 #[derive(Copy, Clone, Debug)]
1945 crate struct Span(rustc_span::Span);
1948 /// Wraps a [`rustc_span::Span`]. In case this span is the result of a macro expansion, the
1949 /// span will be updated to point to the macro invocation instead of the macro definition.
1951 /// (See rust-lang/rust#39726)
1952 crate fn new(sp: rustc_span::Span) -> Self {
1953 Self(sp.source_callsite())
1956 crate fn inner(&self) -> rustc_span::Span {
1960 crate fn dummy() -> Self {
1961 Self(rustc_span::DUMMY_SP)
1964 crate fn is_dummy(&self) -> bool {
1968 crate fn filename(&self, sess: &Session) -> FileName {
1969 sess.source_map().span_to_filename(self.0)
1972 crate fn lo(&self, sess: &Session) -> Loc {
1973 sess.source_map().lookup_char_pos(self.0.lo())
1976 crate fn hi(&self, sess: &Session) -> Loc {
1977 sess.source_map().lookup_char_pos(self.0.hi())
1980 crate fn cnum(&self, sess: &Session) -> CrateNum {
1981 // FIXME: is there a time when the lo and hi crate would be different?
1982 self.lo(sess).file.cnum
1986 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
1989 crate segments: Vec<PathSegment>,
1993 crate fn def_id(&self) -> DefId {
1997 crate fn last(&self) -> Symbol {
1998 self.segments.last().expect("segments were empty").name
2001 crate fn whole_name(&self) -> String {
2004 .map(|s| if s.name == kw::PathRoot { String::new() } else { s.name.to_string() })
2005 .intersperse("::".into())
2009 /// Checks if this is a `T::Name` path for an associated type.
2010 crate fn is_assoc_ty(&self) -> bool {
2012 Res::SelfTy(..) if self.segments.len() != 1 => true,
2013 Res::Def(DefKind::TyParam, _) if self.segments.len() != 1 => true,
2014 Res::Def(DefKind::AssocTy, _) => true,
2019 crate fn generics(&self) -> Option<Vec<&Type>> {
2020 self.segments.last().and_then(|seg| {
2021 if let GenericArgs::AngleBracketed { ref args, .. } = seg.args {
2024 .filter_map(|arg| match arg {
2025 GenericArg::Type(ty) => Some(ty),
2036 crate fn bindings(&self) -> Option<&[TypeBinding]> {
2037 self.segments.last().and_then(|seg| {
2038 if let GenericArgs::AngleBracketed { ref bindings, .. } = seg.args {
2047 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
2048 crate enum GenericArg {
2051 Const(Box<Constant>),
2055 // `GenericArg` can occur many times in a single `Path`, so make sure it
2056 // doesn't increase in size unexpectedly.
2057 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
2058 rustc_data_structures::static_assert_size!(GenericArg, 80);
2060 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
2061 crate enum GenericArgs {
2062 AngleBracketed { args: Vec<GenericArg>, bindings: Vec<TypeBinding> },
2063 Parenthesized { inputs: Vec<Type>, output: Option<Box<Type>> },
2066 // `GenericArgs` is in every `PathSegment`, so its size can significantly
2067 // affect rustdoc's memory usage.
2068 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
2069 rustc_data_structures::static_assert_size!(GenericArgs, 56);
2071 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
2072 crate struct PathSegment {
2074 crate args: GenericArgs,
2077 // `PathSegment` usually occurs multiple times in every `Path`, so its size can
2078 // significantly affect rustdoc's memory usage.
2079 #[cfg(all(target_arch = "x86_64", target_pointer_width = "64"))]
2080 rustc_data_structures::static_assert_size!(PathSegment, 64);
2082 #[derive(Clone, Debug)]
2083 crate struct Typedef {
2085 crate generics: Generics,
2086 /// `type_` can come from either the HIR or from metadata. If it comes from HIR, it may be a type
2087 /// alias instead of the final type. This will always have the final type, regardless of whether
2088 /// `type_` came from HIR or from metadata.
2090 /// If `item_type.is_none()`, `type_` is guarenteed to come from metadata (and therefore hold the
2092 crate item_type: Option<Type>,
2095 #[derive(Clone, Debug)]
2096 crate struct OpaqueTy {
2097 crate bounds: Vec<GenericBound>,
2098 crate generics: Generics,
2101 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
2102 crate struct BareFunctionDecl {
2103 crate unsafety: hir::Unsafety,
2104 crate generic_params: Vec<GenericParamDef>,
2109 #[derive(Clone, Debug)]
2110 crate struct Static {
2112 crate mutability: Mutability,
2113 crate expr: Option<BodyId>,
2116 #[derive(Clone, PartialEq, Eq, Hash, Debug)]
2117 crate struct Constant {
2119 crate kind: ConstantKind,
2122 #[derive(Clone, PartialEq, Eq, Hash, Debug)]
2123 crate enum ConstantKind {
2124 /// This is the wrapper around `ty::Const` for a non-local constant. Because it doesn't have a
2125 /// `BodyId`, we need to handle it on its own.
2127 /// Note that `ty::Const` includes generic parameters, and may not always be uniquely identified
2128 /// by a DefId. So this field must be different from `Extern`.
2129 TyConst { expr: String },
2130 /// A constant (expression) that's not an item or associated item. These are usually found
2131 /// nested inside types (e.g., array lengths) or expressions (e.g., repeat counts), and also
2132 /// used to define explicit discriminant values for enum variants.
2133 Anonymous { body: BodyId },
2134 /// A constant from a different crate.
2135 Extern { def_id: DefId },
2136 /// `const FOO: u32 = ...;`
2137 Local { def_id: DefId, body: BodyId },
2141 crate fn expr(&self, tcx: TyCtxt<'_>) -> String {
2145 crate fn value(&self, tcx: TyCtxt<'_>) -> Option<String> {
2146 self.kind.value(tcx)
2149 crate fn is_literal(&self, tcx: TyCtxt<'_>) -> bool {
2150 self.kind.is_literal(tcx)
2155 crate fn expr(&self, tcx: TyCtxt<'_>) -> String {
2157 ConstantKind::TyConst { ref expr } => expr.clone(),
2158 ConstantKind::Extern { def_id } => print_inlined_const(tcx, def_id),
2159 ConstantKind::Local { body, .. } | ConstantKind::Anonymous { body } => {
2160 print_const_expr(tcx, body)
2165 crate fn value(&self, tcx: TyCtxt<'_>) -> Option<String> {
2167 ConstantKind::TyConst { .. } | ConstantKind::Anonymous { .. } => None,
2168 ConstantKind::Extern { def_id } | ConstantKind::Local { def_id, .. } => {
2169 print_evaluated_const(tcx, def_id)
2174 crate fn is_literal(&self, tcx: TyCtxt<'_>) -> bool {
2176 ConstantKind::TyConst { .. } => false,
2177 ConstantKind::Extern { def_id } => def_id.as_local().map_or(false, |def_id| {
2178 is_literal_expr(tcx, tcx.hir().local_def_id_to_hir_id(def_id))
2180 ConstantKind::Local { body, .. } | ConstantKind::Anonymous { body } => {
2181 is_literal_expr(tcx, body.hir_id)
2187 #[derive(Clone, Debug)]
2189 crate unsafety: hir::Unsafety,
2190 crate generics: Generics,
2191 crate trait_: Option<Path>,
2193 crate items: Vec<Item>,
2194 crate polarity: ty::ImplPolarity,
2195 crate kind: ImplKind,
2199 crate fn provided_trait_methods(&self, tcx: TyCtxt<'_>) -> FxHashSet<Symbol> {
2202 .map(|t| t.def_id())
2203 .map(|did| tcx.provided_trait_methods(did).map(|meth| meth.ident.name).collect())
2204 .unwrap_or_default()
2208 #[derive(Clone, Debug)]
2209 crate enum ImplKind {
2216 crate fn is_auto(&self) -> bool {
2217 matches!(self, ImplKind::Auto)
2220 crate fn is_blanket(&self) -> bool {
2221 matches!(self, ImplKind::Blanket(_))
2224 crate fn as_blanket_ty(&self) -> Option<&Type> {
2226 ImplKind::Blanket(ty) => Some(ty),
2232 #[derive(Clone, Debug)]
2233 crate struct Import {
2234 crate kind: ImportKind,
2235 crate source: ImportSource,
2236 crate should_be_displayed: bool,
2240 crate fn new_simple(name: Symbol, source: ImportSource, should_be_displayed: bool) -> Self {
2241 Self { kind: ImportKind::Simple(name), source, should_be_displayed }
2244 crate fn new_glob(source: ImportSource, should_be_displayed: bool) -> Self {
2245 Self { kind: ImportKind::Glob, source, should_be_displayed }
2249 #[derive(Clone, Debug)]
2250 crate enum ImportKind {
2251 // use source as str;
2257 #[derive(Clone, Debug)]
2258 crate struct ImportSource {
2260 crate did: Option<DefId>,
2263 #[derive(Clone, Debug)]
2264 crate struct Macro {
2265 crate source: String,
2268 #[derive(Clone, Debug)]
2269 crate struct ProcMacro {
2270 crate kind: MacroKind,
2271 crate helpers: Vec<Symbol>,
2274 /// An type binding on an associated type (e.g., `A = Bar` in `Foo<A = Bar>` or
2275 /// `A: Send + Sync` in `Foo<A: Send + Sync>`).
2276 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
2277 crate struct TypeBinding {
2279 crate kind: TypeBindingKind,
2282 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
2283 crate enum TypeBindingKind {
2284 Equality { ty: Type },
2285 Constraint { bounds: Vec<GenericBound> },
2289 crate fn ty(&self) -> &Type {
2291 TypeBindingKind::Equality { ref ty } => ty,
2292 _ => panic!("expected equality type binding for parenthesized generic args"),
2297 /// The type, lifetime, or constant that a private type alias's parameter should be
2298 /// replaced with when expanding a use of that type alias.
2303 /// type PrivAlias<T> = Vec<T>;
2305 /// pub fn public_fn() -> PrivAlias<i32> { vec![] }
2308 /// `public_fn`'s docs will show it as returning `Vec<i32>`, since `PrivAlias` is private.
2309 /// [`SubstParam`] is used to record that `T` should be mapped to `i32`.
2310 crate enum SubstParam {
2317 crate fn as_ty(&self) -> Option<&Type> {
2318 if let Self::Type(ty) = self { Some(ty) } else { None }
2321 crate fn as_lt(&self) -> Option<&Lifetime> {
2322 if let Self::Lifetime(lt) = self { Some(lt) } else { None }