1 use crate::clean::auto_trait::AutoTraitFinder;
2 use crate::clean::blanket_impl::BlanketImplFinder;
4 inline, Clean, Crate, Deprecation, ExternalCrate, FnDecl, FnRetTy, Generic, GenericArg,
5 GenericArgs, GenericBound, Generics, GetDefId, ImportSource, Item, ItemKind, Lifetime,
6 MacroKind, Path, PathSegment, Primitive, PrimitiveType, ResolvedPath, Span, Type, TypeBinding,
7 TypeKind, Visibility, WherePredicate,
9 use crate::core::DocContext;
11 use itertools::Itertools;
12 use rustc_attr::Stability;
13 use rustc_data_structures::fx::FxHashSet;
15 use rustc_hir::def::{DefKind, Res};
16 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
17 use rustc_middle::mir::interpret::ConstValue;
18 use rustc_middle::ty::subst::{GenericArgKind, SubstsRef};
19 use rustc_middle::ty::{self, DefIdTree, Ty};
20 use rustc_span::symbol::{kw, sym, Symbol};
23 pub fn krate(mut cx: &mut DocContext<'_>) -> Crate {
24 use crate::visit_lib::LibEmbargoVisitor;
26 let krate = cx.tcx.hir().krate();
27 let module = crate::visit_ast::RustdocVisitor::new(&mut cx).visit(krate);
29 let mut r = cx.renderinfo.get_mut();
30 r.deref_trait_did = cx.tcx.lang_items().deref_trait();
31 r.deref_mut_trait_did = cx.tcx.lang_items().deref_mut_trait();
32 r.owned_box_did = cx.tcx.lang_items().owned_box();
34 let mut externs = Vec::new();
35 for &cnum in cx.tcx.crates().iter() {
36 externs.push((cnum, cnum.clean(cx)));
37 // Analyze doc-reachability for extern items
38 LibEmbargoVisitor::new(&mut cx).visit_lib(cnum);
40 externs.sort_by(|&(a, _), &(b, _)| a.cmp(&b));
42 // Clean the crate, translating the entire librustc_ast AST to one that is
43 // understood by rustdoc.
44 let mut module = module.clean(cx);
45 let mut masked_crates = FxHashSet::default();
48 ItemKind::ModuleItem(ref module) => {
49 for it in &module.items {
50 // `compiler_builtins` should be masked too, but we can't apply
51 // `#[doc(masked)]` to the injected `extern crate` because it's unstable.
52 if it.is_extern_crate()
53 && (it.attrs.has_doc_flag(sym::masked)
54 || cx.tcx.is_compiler_builtins(it.def_id.krate))
56 masked_crates.insert(it.def_id.krate);
63 let ExternalCrate { name, src, primitives, keywords, .. } = LOCAL_CRATE.clean(cx);
65 let m = match module.kind {
66 ItemKind::ModuleItem(ref mut m) => m,
69 m.items.extend(primitives.iter().map(|&(def_id, prim, ref attrs)| Item {
70 source: Span::empty(),
71 name: Some(prim.to_url_str().to_string()),
73 visibility: Visibility::Public,
74 stability: get_stability(cx, def_id),
75 deprecation: get_deprecation(cx, def_id),
77 kind: ItemKind::PrimitiveItem(prim),
79 m.items.extend(keywords.into_iter().map(|(def_id, kw, attrs)| Item {
80 source: Span::empty(),
81 name: Some(kw.clone()),
83 visibility: Visibility::Public,
84 stability: get_stability(cx, def_id),
85 deprecation: get_deprecation(cx, def_id),
87 kind: ItemKind::KeywordItem(kw),
98 external_traits: cx.external_traits.clone(),
104 // extract the stability index for a node from tcx, if possible
105 pub fn get_stability(cx: &DocContext<'_>, def_id: DefId) -> Option<Stability> {
106 cx.tcx.lookup_stability(def_id).cloned()
109 pub fn get_deprecation(cx: &DocContext<'_>, def_id: DefId) -> Option<Deprecation> {
110 cx.tcx.lookup_deprecation(def_id).clean(cx)
113 fn external_generic_args(
115 trait_did: Option<DefId>,
117 bindings: Vec<TypeBinding>,
118 substs: SubstsRef<'_>,
120 let mut skip_self = has_self;
121 let mut ty_kind = None;
122 let args: Vec<_> = substs
124 .filter_map(|kind| match kind.unpack() {
125 GenericArgKind::Lifetime(lt) => match lt {
126 ty::ReLateBound(_, ty::BrAnon(_)) => Some(GenericArg::Lifetime(Lifetime::elided())),
127 _ => lt.clean(cx).map(GenericArg::Lifetime),
129 GenericArgKind::Type(_) if skip_self => {
133 GenericArgKind::Type(ty) => {
134 ty_kind = Some(ty.kind());
135 Some(GenericArg::Type(ty.clean(cx)))
137 GenericArgKind::Const(ct) => Some(GenericArg::Const(ct.clean(cx))),
142 // Attempt to sugar an external path like Fn<(A, B,), C> to Fn(A, B) -> C
143 Some(did) if cx.tcx.fn_trait_kind_from_lang_item(did).is_some() => {
144 assert!(ty_kind.is_some());
145 let inputs = match ty_kind {
146 Some(ty::Tuple(ref tys)) => tys.iter().map(|t| t.expect_ty().clean(cx)).collect(),
147 _ => return GenericArgs::AngleBracketed { args, bindings },
150 // FIXME(#20299) return type comes from a projection now
151 // match types[1].kind {
152 // ty::Tuple(ref v) if v.is_empty() => None, // -> ()
153 // _ => Some(types[1].clean(cx))
155 GenericArgs::Parenthesized { inputs, output }
157 _ => GenericArgs::AngleBracketed { args, bindings },
161 // trait_did should be set to a trait's DefId if called on a TraitRef, in order to sugar
162 // from Fn<(A, B,), C> to Fn(A, B) -> C
163 pub(super) fn external_path(
166 trait_did: Option<DefId>,
168 bindings: Vec<TypeBinding>,
169 substs: SubstsRef<'_>,
174 segments: vec![PathSegment {
175 name: name.to_string(),
176 args: external_generic_args(cx, trait_did, has_self, bindings, substs),
181 /// The point of this function is to replace bounds with types.
183 /// i.e. `[T, U]` when you have the following bounds: `T: Display, U: Option<T>` will return
184 /// `[Display, Option]` (we just returns the list of the types, we don't care about the
185 /// wrapped types in here).
186 pub fn get_real_types(
191 ) -> FxHashSet<(Type, TypeKind)> {
192 let arg_s = arg.print().to_string();
193 let mut res = FxHashSet::default();
195 // FIXME: remove this whole recurse thing when the recursion bug is fixed
198 if arg.is_full_generic() {
199 if let Some(where_pred) = generics.where_predicates.iter().find(|g| match g {
200 &WherePredicate::BoundPredicate { ref ty, .. } => ty.def_id() == arg.def_id(),
203 let bounds = where_pred.get_bounds().unwrap_or_else(|| &[]);
204 for bound in bounds.iter() {
205 if let GenericBound::TraitBound(ref poly_trait, _) = *bound {
206 for x in poly_trait.generic_params.iter() {
210 if let Some(ty) = x.get_type() {
211 let adds = get_real_types(generics, &ty, cx, recurse + 1);
212 if !adds.is_empty() {
214 } else if !ty.is_full_generic() {
216 ty.def_id().map(|did| cx.tcx.def_kind(did).clean(cx))
218 res.insert((ty, kind));
226 if let Some(bound) = generics.params.iter().find(|g| g.is_type() && g.name == arg_s) {
227 for bound in bound.get_bounds().unwrap_or_else(|| &[]) {
228 if let Some(ty) = bound.get_trait_type() {
229 let adds = get_real_types(generics, &ty, cx, recurse + 1);
230 if !adds.is_empty() {
232 } else if !ty.is_full_generic() {
233 if let Some(kind) = ty.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
234 res.insert((ty.clone(), kind));
241 if let Some(kind) = arg.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
242 res.insert((arg.clone(), kind));
244 if let Some(gens) = arg.generics() {
245 for gen in gens.iter() {
246 if gen.is_full_generic() {
247 let adds = get_real_types(generics, gen, cx, recurse + 1);
248 if !adds.is_empty() {
251 } else if let Some(kind) = gen.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
252 res.insert((gen.clone(), kind));
260 /// Return the full list of types when bounds have been resolved.
262 /// i.e. `fn foo<A: Display, B: Option<A>>(x: u32, y: B)` will return
263 /// `[u32, Display, Option]`.
264 pub fn get_all_types(
268 ) -> (Vec<(Type, TypeKind)>, Vec<(Type, TypeKind)>) {
269 let mut all_types = FxHashSet::default();
270 for arg in decl.inputs.values.iter() {
271 if arg.type_.is_self_type() {
274 let args = get_real_types(generics, &arg.type_, cx, 0);
275 if !args.is_empty() {
276 all_types.extend(args);
278 if let Some(kind) = arg.type_.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
279 all_types.insert((arg.type_.clone(), kind));
284 let ret_types = match decl.output {
285 FnRetTy::Return(ref return_type) => {
286 let mut ret = get_real_types(generics, &return_type, cx, 0);
288 if let Some(kind) = return_type.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
289 ret.insert((return_type.clone(), kind));
292 ret.into_iter().collect()
296 (all_types.into_iter().collect(), ret_types)
299 pub fn strip_type(ty: Type) -> Type {
301 Type::ResolvedPath { path, param_names, did, is_generic } => {
302 Type::ResolvedPath { path: strip_path(&path), param_names, did, is_generic }
304 Type::Tuple(inner_tys) => {
305 Type::Tuple(inner_tys.iter().map(|t| strip_type(t.clone())).collect())
307 Type::Slice(inner_ty) => Type::Slice(Box::new(strip_type(*inner_ty))),
308 Type::Array(inner_ty, s) => Type::Array(Box::new(strip_type(*inner_ty)), s),
309 Type::RawPointer(m, inner_ty) => Type::RawPointer(m, Box::new(strip_type(*inner_ty))),
310 Type::BorrowedRef { lifetime, mutability, type_ } => {
311 Type::BorrowedRef { lifetime, mutability, type_: Box::new(strip_type(*type_)) }
313 Type::QPath { name, self_type, trait_ } => Type::QPath {
315 self_type: Box::new(strip_type(*self_type)),
316 trait_: Box::new(strip_type(*trait_)),
322 pub fn strip_path(path: &Path) -> Path {
326 .map(|s| PathSegment {
327 name: s.name.clone(),
328 args: GenericArgs::AngleBracketed { args: vec![], bindings: vec![] },
332 Path { global: path.global, res: path.res, segments }
335 pub fn qpath_to_string(p: &hir::QPath<'_>) -> String {
336 let segments = match *p {
337 hir::QPath::Resolved(_, ref path) => &path.segments,
338 hir::QPath::TypeRelative(_, ref segment) => return segment.ident.to_string(),
339 hir::QPath::LangItem(lang_item, ..) => return lang_item.name().to_string(),
342 let mut s = String::new();
343 for (i, seg) in segments.iter().enumerate() {
347 if seg.ident.name != kw::PathRoot {
348 s.push_str(&seg.ident.as_str());
354 pub fn build_deref_target_impls(cx: &DocContext<'_>, items: &[Item], ret: &mut Vec<Item>) {
358 let target = match item.kind {
359 ItemKind::TypedefItem(ref t, true) => &t.type_,
362 let primitive = match *target {
363 ResolvedPath { did, .. } if did.is_local() => continue,
364 ResolvedPath { did, .. } => {
365 ret.extend(inline::build_impls(cx, None, did, None));
368 _ => match target.primitive_type() {
373 for &did in primitive.impls(tcx) {
375 inline::build_impl(cx, None, did, None, ret);
382 fn to_src(&self, cx: &DocContext<'_>) -> String;
385 impl ToSource for rustc_span::Span {
386 fn to_src(&self, cx: &DocContext<'_>) -> String {
387 debug!("converting span {:?} to snippet", self.clean(cx));
388 let sn = match cx.sess().source_map().span_to_snippet(*self) {
390 Err(_) => String::new(),
392 debug!("got snippet {}", sn);
397 pub fn name_from_pat(p: &hir::Pat<'_>) -> String {
399 debug!("trying to get a name from pattern: {:?}", p);
402 PatKind::Wild => "_".to_string(),
403 PatKind::Binding(_, _, ident, _) => ident.to_string(),
404 PatKind::TupleStruct(ref p, ..) | PatKind::Path(ref p) => qpath_to_string(p),
405 PatKind::Struct(ref name, ref fields, etc) => format!(
407 qpath_to_string(name),
410 .map(|fp| format!("{}: {}", fp.ident, name_from_pat(&fp.pat)))
411 .collect::<Vec<String>>()
413 if etc { ", .." } else { "" }
415 PatKind::Or(ref pats) => {
416 pats.iter().map(|p| name_from_pat(&**p)).collect::<Vec<String>>().join(" | ")
418 PatKind::Tuple(ref elts, _) => format!(
420 elts.iter().map(|p| name_from_pat(&**p)).collect::<Vec<String>>().join(", ")
422 PatKind::Box(ref p) => name_from_pat(&**p),
423 PatKind::Ref(ref p, _) => name_from_pat(&**p),
424 PatKind::Lit(..) => {
426 "tried to get argument name from PatKind::Lit, which is silly in function arguments"
430 PatKind::Range(..) => panic!(
431 "tried to get argument name from PatKind::Range, \
432 which is not allowed in function arguments"
434 PatKind::Slice(ref begin, ref mid, ref end) => {
435 let begin = begin.iter().map(|p| name_from_pat(&**p));
436 let mid = mid.as_ref().map(|p| format!("..{}", name_from_pat(&**p))).into_iter();
437 let end = end.iter().map(|p| name_from_pat(&**p));
438 format!("[{}]", begin.chain(mid).chain(end).collect::<Vec<_>>().join(", "))
443 pub fn print_const(cx: &DocContext<'_>, n: &'tcx ty::Const<'_>) -> String {
445 ty::ConstKind::Unevaluated(def, _, promoted) => {
446 let mut s = if let Some(def) = def.as_local() {
447 let hir_id = cx.tcx.hir().local_def_id_to_hir_id(def.did);
448 print_const_expr(cx, cx.tcx.hir().body_owned_by(hir_id))
450 inline::print_inlined_const(cx, def.did)
452 if let Some(promoted) = promoted {
453 s.push_str(&format!("::{:?}", promoted))
458 let mut s = n.to_string();
459 // array lengths are obviously usize
460 if s.ends_with("_usize") {
461 let n = s.len() - "_usize".len();
463 if s.ends_with(": ") {
464 let n = s.len() - ": ".len();
473 pub fn print_evaluated_const(cx: &DocContext<'_>, def_id: DefId) -> Option<String> {
474 cx.tcx.const_eval_poly(def_id).ok().and_then(|val| {
475 let ty = cx.tcx.type_of(def_id);
476 match (val, ty.kind()) {
477 (_, &ty::Ref(..)) => None,
478 (ConstValue::Scalar(_), &ty::Adt(_, _)) => None,
479 (ConstValue::Scalar(_), _) => {
480 let const_ = ty::Const::from_value(cx.tcx, val, ty);
481 Some(print_const_with_custom_print_scalar(cx, const_))
488 fn format_integer_with_underscore_sep(num: &str) -> String {
489 let num_chars: Vec<_> = num.chars().collect();
490 let num_start_index = if num_chars.get(0) == Some(&'-') { 1 } else { 0 };
492 num_chars[..num_start_index]
494 .chain(num_chars[num_start_index..].rchunks(3).rev().intersperse(&['_']).flatten())
498 fn print_const_with_custom_print_scalar(cx: &DocContext<'_>, ct: &'tcx ty::Const<'tcx>) -> String {
499 // Use a slightly different format for integer types which always shows the actual value.
500 // For all other types, fallback to the original `pretty_print_const`.
501 match (ct.val, ct.ty.kind()) {
502 (ty::ConstKind::Value(ConstValue::Scalar(int)), ty::Uint(ui)) => {
503 format!("{}{}", format_integer_with_underscore_sep(&int.to_string()), ui.name_str())
505 (ty::ConstKind::Value(ConstValue::Scalar(int)), ty::Int(i)) => {
506 let ty = cx.tcx.lift(ct.ty).unwrap();
507 let size = cx.tcx.layout_of(ty::ParamEnv::empty().and(ty)).unwrap().size;
508 let data = int.assert_bits(size);
509 let sign_extended_data = size.sign_extend(data) as i128;
513 format_integer_with_underscore_sep(&sign_extended_data.to_string()),
521 pub fn is_literal_expr(cx: &DocContext<'_>, hir_id: hir::HirId) -> bool {
522 if let hir::Node::Expr(expr) = cx.tcx.hir().get(hir_id) {
523 if let hir::ExprKind::Lit(_) = &expr.kind {
527 if let hir::ExprKind::Unary(hir::UnOp::UnNeg, expr) = &expr.kind {
528 if let hir::ExprKind::Lit(_) = &expr.kind {
537 pub fn print_const_expr(cx: &DocContext<'_>, body: hir::BodyId) -> String {
538 let value = &cx.tcx.hir().body(body).value;
540 let snippet = if !value.span.from_expansion() {
541 cx.sess().source_map().span_to_snippet(value.span).ok()
546 snippet.unwrap_or_else(|| rustc_hir_pretty::id_to_string(&cx.tcx.hir(), body.hir_id))
549 /// Given a type Path, resolve it to a Type using the TyCtxt
550 pub fn resolve_type(cx: &DocContext<'_>, path: Path, id: hir::HirId) -> Type {
551 debug!("resolve_type({:?},{:?})", path, id);
553 let is_generic = match path.res {
554 Res::PrimTy(p) => return Primitive(PrimitiveType::from(p)),
555 Res::SelfTy(..) if path.segments.len() == 1 => {
556 return Generic(kw::SelfUpper.to_string());
558 Res::Def(DefKind::TyParam, _) if path.segments.len() == 1 => {
559 return Generic(format!("{:#}", path.print()));
561 Res::SelfTy(..) | Res::Def(DefKind::TyParam | DefKind::AssocTy, _) => true,
564 let did = register_res(&*cx, path.res);
565 ResolvedPath { path, param_names: None, did, is_generic }
568 pub fn get_auto_trait_and_blanket_impls(
569 cx: &DocContext<'tcx>,
571 param_env_def_id: DefId,
572 ) -> impl Iterator<Item = Item> {
573 AutoTraitFinder::new(cx)
574 .get_auto_trait_impls(ty, param_env_def_id)
576 .chain(BlanketImplFinder::new(cx).get_blanket_impls(ty, param_env_def_id))
579 pub fn register_res(cx: &DocContext<'_>, res: Res) -> DefId {
580 debug!("register_res({:?})", res);
582 let (did, kind) = match res {
583 Res::Def(DefKind::Fn, i) => (i, TypeKind::Function),
584 Res::Def(DefKind::TyAlias, i) => (i, TypeKind::Typedef),
585 Res::Def(DefKind::Enum, i) => (i, TypeKind::Enum),
586 Res::Def(DefKind::Trait, i) => (i, TypeKind::Trait),
587 Res::Def(DefKind::AssocTy | DefKind::AssocFn | DefKind::AssocConst, i) => {
588 (cx.tcx.parent(i).unwrap(), TypeKind::Trait)
590 Res::Def(DefKind::Struct, i) => (i, TypeKind::Struct),
591 Res::Def(DefKind::Union, i) => (i, TypeKind::Union),
592 Res::Def(DefKind::Mod, i) => (i, TypeKind::Module),
593 Res::Def(DefKind::ForeignTy, i) => (i, TypeKind::Foreign),
594 Res::Def(DefKind::Const, i) => (i, TypeKind::Const),
595 Res::Def(DefKind::Static, i) => (i, TypeKind::Static),
596 Res::Def(DefKind::Variant, i) => {
597 (cx.tcx.parent(i).expect("cannot get parent def id"), TypeKind::Enum)
599 Res::Def(DefKind::Macro(mac_kind), i) => match mac_kind {
600 MacroKind::Bang => (i, TypeKind::Macro),
601 MacroKind::Attr => (i, TypeKind::Attr),
602 MacroKind::Derive => (i, TypeKind::Derive),
604 Res::Def(DefKind::TraitAlias, i) => (i, TypeKind::TraitAlias),
605 Res::SelfTy(Some(def_id), _) => (def_id, TypeKind::Trait),
606 Res::SelfTy(_, Some((impl_def_id, _))) => return impl_def_id,
607 _ => return res.def_id(),
612 inline::record_extern_fqn(cx, did, kind);
613 if let TypeKind::Trait = kind {
614 inline::record_extern_trait(cx, did);
619 pub fn resolve_use_source(cx: &DocContext<'_>, path: Path) -> ImportSource {
621 did: if path.res.opt_def_id().is_none() { None } else { Some(register_res(cx, path.res)) },
626 pub fn enter_impl_trait<F, R>(cx: &DocContext<'_>, f: F) -> R
630 let old_bounds = mem::take(&mut *cx.impl_trait_bounds.borrow_mut());
632 assert!(cx.impl_trait_bounds.borrow().is_empty());
633 *cx.impl_trait_bounds.borrow_mut() = old_bounds;