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, ItemEnum, MacroKind, Path,
6 PathSegment, Primitive, PrimitiveType, ResolvedPath, Span, Stability, Type, TypeBinding,
7 TypeKind, Visibility, WherePredicate,
9 use crate::core::DocContext;
11 use itertools::Itertools;
12 use rustc_data_structures::fx::FxHashSet;
14 use rustc_hir::def::{DefKind, Res};
15 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
16 use rustc_middle::mir::interpret::{sign_extend, ConstValue, Scalar};
17 use rustc_middle::ty::subst::{GenericArgKind, SubstsRef};
18 use rustc_middle::ty::{self, DefIdTree, Ty};
19 use rustc_span::symbol::{kw, sym, Symbol};
22 pub fn krate(mut cx: &mut DocContext<'_>) -> Crate {
23 use crate::visit_lib::LibEmbargoVisitor;
25 let krate = cx.tcx.hir().krate();
26 let module = crate::visit_ast::RustdocVisitor::new(&mut cx).visit(krate);
28 let mut r = cx.renderinfo.get_mut();
29 r.deref_trait_did = cx.tcx.lang_items().deref_trait();
30 r.deref_mut_trait_did = cx.tcx.lang_items().deref_mut_trait();
31 r.owned_box_did = cx.tcx.lang_items().owned_box();
33 let mut externs = Vec::new();
34 for &cnum in cx.tcx.crates().iter() {
35 externs.push((cnum, cnum.clean(cx)));
36 // Analyze doc-reachability for extern items
37 LibEmbargoVisitor::new(&mut cx).visit_lib(cnum);
39 externs.sort_by(|&(a, _), &(b, _)| a.cmp(&b));
41 // Clean the crate, translating the entire librustc_ast AST to one that is
42 // understood by rustdoc.
43 let mut module = module.clean(cx);
44 let mut masked_crates = FxHashSet::default();
47 ItemEnum::ModuleItem(ref module) => {
48 for it in &module.items {
49 // `compiler_builtins` should be masked too, but we can't apply
50 // `#[doc(masked)]` to the injected `extern crate` because it's unstable.
51 if it.is_extern_crate()
52 && (it.attrs.has_doc_flag(sym::masked)
53 || cx.tcx.is_compiler_builtins(it.def_id.krate))
55 masked_crates.insert(it.def_id.krate);
62 let ExternalCrate { name, src, primitives, keywords, .. } = LOCAL_CRATE.clean(cx);
64 let m = match module.inner {
65 ItemEnum::ModuleItem(ref mut m) => m,
68 m.items.extend(primitives.iter().map(|&(def_id, prim, ref attrs)| Item {
69 source: Span::empty(),
70 name: Some(prim.to_url_str().to_string()),
72 visibility: Visibility::Public,
73 stability: get_stability(cx, def_id),
74 deprecation: get_deprecation(cx, def_id),
76 inner: ItemEnum::PrimitiveItem(prim),
78 m.items.extend(keywords.into_iter().map(|(def_id, kw, attrs)| Item {
79 source: Span::empty(),
80 name: Some(kw.clone()),
82 visibility: Visibility::Public,
83 stability: get_stability(cx, def_id),
84 deprecation: get_deprecation(cx, def_id),
86 inner: ItemEnum::KeywordItem(kw),
97 external_traits: cx.external_traits.clone(),
103 // extract the stability index for a node from tcx, if possible
104 pub fn get_stability(cx: &DocContext<'_>, def_id: DefId) -> Option<Stability> {
105 cx.tcx.lookup_stability(def_id).clean(cx)
108 pub fn get_deprecation(cx: &DocContext<'_>, def_id: DefId) -> Option<Deprecation> {
109 cx.tcx.lookup_deprecation(def_id).clean(cx)
112 pub fn external_generic_args(
114 trait_did: Option<DefId>,
116 bindings: Vec<TypeBinding>,
117 substs: SubstsRef<'_>,
119 let mut skip_self = has_self;
120 let mut ty_kind = None;
121 let args: Vec<_> = substs
123 .filter_map(|kind| match kind.unpack() {
124 GenericArgKind::Lifetime(lt) => lt.clean(cx).map(GenericArg::Lifetime),
125 GenericArgKind::Type(_) if skip_self => {
129 GenericArgKind::Type(ty) => {
130 ty_kind = Some(&ty.kind);
131 Some(GenericArg::Type(ty.clean(cx)))
133 GenericArgKind::Const(ct) => Some(GenericArg::Const(ct.clean(cx))),
138 // Attempt to sugar an external path like Fn<(A, B,), C> to Fn(A, B) -> C
139 Some(did) if cx.tcx.fn_trait_kind_from_lang_item(did).is_some() => {
140 assert!(ty_kind.is_some());
141 let inputs = match ty_kind {
142 Some(ty::Tuple(ref tys)) => tys.iter().map(|t| t.expect_ty().clean(cx)).collect(),
143 _ => return GenericArgs::AngleBracketed { args, bindings },
146 // FIXME(#20299) return type comes from a projection now
147 // match types[1].kind {
148 // ty::Tuple(ref v) if v.is_empty() => None, // -> ()
149 // _ => Some(types[1].clean(cx))
151 GenericArgs::Parenthesized { inputs, output }
153 _ => GenericArgs::AngleBracketed { args, bindings },
157 // trait_did should be set to a trait's DefId if called on a TraitRef, in order to sugar
158 // from Fn<(A, B,), C> to Fn(A, B) -> C
159 pub fn external_path(
162 trait_did: Option<DefId>,
164 bindings: Vec<TypeBinding>,
165 substs: SubstsRef<'_>,
170 segments: vec![PathSegment {
171 name: name.to_string(),
172 args: external_generic_args(cx, trait_did, has_self, bindings, substs),
177 /// The point of this function is to replace bounds with types.
179 /// i.e. `[T, U]` when you have the following bounds: `T: Display, U: Option<T>` will return
180 /// `[Display, Option]` (we just returns the list of the types, we don't care about the
181 /// wrapped types in here).
182 pub fn get_real_types(
187 ) -> FxHashSet<(Type, TypeKind)> {
188 let arg_s = arg.print().to_string();
189 let mut res = FxHashSet::default();
191 // FIXME: remove this whole recurse thing when the recursion bug is fixed
194 if arg.is_full_generic() {
195 if let Some(where_pred) = generics.where_predicates.iter().find(|g| match g {
196 &WherePredicate::BoundPredicate { ref ty, .. } => ty.def_id() == arg.def_id(),
199 let bounds = where_pred.get_bounds().unwrap_or_else(|| &[]);
200 for bound in bounds.iter() {
201 if let GenericBound::TraitBound(ref poly_trait, _) = *bound {
202 for x in poly_trait.generic_params.iter() {
206 if let Some(ty) = x.get_type() {
207 let adds = get_real_types(generics, &ty, cx, recurse + 1);
208 if !adds.is_empty() {
210 } else if !ty.is_full_generic() {
212 ty.def_id().map(|did| cx.tcx.def_kind(did).clean(cx))
214 res.insert((ty, kind));
222 if let Some(bound) = generics.params.iter().find(|g| g.is_type() && g.name == arg_s) {
223 for bound in bound.get_bounds().unwrap_or_else(|| &[]) {
224 if let Some(ty) = bound.get_trait_type() {
225 let adds = get_real_types(generics, &ty, cx, recurse + 1);
226 if !adds.is_empty() {
228 } else if !ty.is_full_generic() {
229 if let Some(kind) = ty.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
230 res.insert((ty.clone(), kind));
237 if let Some(kind) = arg.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
238 res.insert((arg.clone(), kind));
240 if let Some(gens) = arg.generics() {
241 for gen in gens.iter() {
242 if gen.is_full_generic() {
243 let adds = get_real_types(generics, gen, cx, recurse + 1);
244 if !adds.is_empty() {
247 } else if let Some(kind) = gen.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
248 res.insert((gen.clone(), kind));
256 /// Return the full list of types when bounds have been resolved.
258 /// i.e. `fn foo<A: Display, B: Option<A>>(x: u32, y: B)` will return
259 /// `[u32, Display, Option]`.
260 pub fn get_all_types(
264 ) -> (Vec<(Type, TypeKind)>, Vec<(Type, TypeKind)>) {
265 let mut all_types = FxHashSet::default();
266 for arg in decl.inputs.values.iter() {
267 if arg.type_.is_self_type() {
270 let args = get_real_types(generics, &arg.type_, cx, 0);
271 if !args.is_empty() {
272 all_types.extend(args);
274 if let Some(kind) = arg.type_.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
275 all_types.insert((arg.type_.clone(), kind));
280 let ret_types = match decl.output {
281 FnRetTy::Return(ref return_type) => {
282 let mut ret = get_real_types(generics, &return_type, cx, 0);
284 if let Some(kind) = return_type.def_id().map(|did| cx.tcx.def_kind(did).clean(cx)) {
285 ret.insert((return_type.clone(), kind));
288 ret.into_iter().collect()
292 (all_types.into_iter().collect(), ret_types)
295 pub fn strip_type(ty: Type) -> Type {
297 Type::ResolvedPath { path, param_names, did, is_generic } => {
298 Type::ResolvedPath { path: strip_path(&path), param_names, did, is_generic }
300 Type::Tuple(inner_tys) => {
301 Type::Tuple(inner_tys.iter().map(|t| strip_type(t.clone())).collect())
303 Type::Slice(inner_ty) => Type::Slice(Box::new(strip_type(*inner_ty))),
304 Type::Array(inner_ty, s) => Type::Array(Box::new(strip_type(*inner_ty)), s),
305 Type::RawPointer(m, inner_ty) => Type::RawPointer(m, Box::new(strip_type(*inner_ty))),
306 Type::BorrowedRef { lifetime, mutability, type_ } => {
307 Type::BorrowedRef { lifetime, mutability, type_: Box::new(strip_type(*type_)) }
309 Type::QPath { name, self_type, trait_ } => Type::QPath {
311 self_type: Box::new(strip_type(*self_type)),
312 trait_: Box::new(strip_type(*trait_)),
318 pub fn strip_path(path: &Path) -> Path {
322 .map(|s| PathSegment {
323 name: s.name.clone(),
324 args: GenericArgs::AngleBracketed { args: vec![], bindings: vec![] },
328 Path { global: path.global, res: path.res, segments }
331 pub fn qpath_to_string(p: &hir::QPath<'_>) -> String {
332 let segments = match *p {
333 hir::QPath::Resolved(_, ref path) => &path.segments,
334 hir::QPath::TypeRelative(_, ref segment) => return segment.ident.to_string(),
337 let mut s = String::new();
338 for (i, seg) in segments.iter().enumerate() {
342 if seg.ident.name != kw::PathRoot {
343 s.push_str(&seg.ident.as_str());
349 pub fn build_deref_target_impls(cx: &DocContext<'_>, items: &[Item], ret: &mut Vec<Item>) {
350 use self::PrimitiveType::*;
354 let target = match item.inner {
355 ItemEnum::TypedefItem(ref t, true) => &t.type_,
358 let primitive = match *target {
359 ResolvedPath { did, .. } if did.is_local() => continue,
360 ResolvedPath { did, .. } => {
361 ret.extend(inline::build_impls(cx, did, None));
364 _ => match target.primitive_type() {
369 let did = match primitive {
370 Isize => tcx.lang_items().isize_impl(),
371 I8 => tcx.lang_items().i8_impl(),
372 I16 => tcx.lang_items().i16_impl(),
373 I32 => tcx.lang_items().i32_impl(),
374 I64 => tcx.lang_items().i64_impl(),
375 I128 => tcx.lang_items().i128_impl(),
376 Usize => tcx.lang_items().usize_impl(),
377 U8 => tcx.lang_items().u8_impl(),
378 U16 => tcx.lang_items().u16_impl(),
379 U32 => tcx.lang_items().u32_impl(),
380 U64 => tcx.lang_items().u64_impl(),
381 U128 => tcx.lang_items().u128_impl(),
382 F32 => tcx.lang_items().f32_impl(),
383 F64 => tcx.lang_items().f64_impl(),
384 Char => tcx.lang_items().char_impl(),
385 Bool => tcx.lang_items().bool_impl(),
386 Str => tcx.lang_items().str_impl(),
387 Slice => tcx.lang_items().slice_impl(),
388 Array => tcx.lang_items().slice_impl(),
391 RawPointer => tcx.lang_items().const_ptr_impl(),
396 if let Some(did) = did {
398 inline::build_impl(cx, did, None, ret);
405 fn to_src(&self, cx: &DocContext<'_>) -> String;
408 impl ToSource for rustc_span::Span {
409 fn to_src(&self, cx: &DocContext<'_>) -> String {
410 debug!("converting span {:?} to snippet", self.clean(cx));
411 let sn = match cx.sess().source_map().span_to_snippet(*self) {
413 Err(_) => String::new(),
415 debug!("got snippet {}", sn);
420 pub fn name_from_pat(p: &hir::Pat<'_>) -> String {
422 debug!("trying to get a name from pattern: {:?}", p);
425 PatKind::Wild => "_".to_string(),
426 PatKind::Binding(_, _, ident, _) => ident.to_string(),
427 PatKind::TupleStruct(ref p, ..) | PatKind::Path(ref p) => qpath_to_string(p),
428 PatKind::Struct(ref name, ref fields, etc) => format!(
430 qpath_to_string(name),
433 .map(|fp| format!("{}: {}", fp.ident, name_from_pat(&fp.pat)))
434 .collect::<Vec<String>>()
436 if etc { ", .." } else { "" }
438 PatKind::Or(ref pats) => {
439 pats.iter().map(|p| name_from_pat(&**p)).collect::<Vec<String>>().join(" | ")
441 PatKind::Tuple(ref elts, _) => format!(
443 elts.iter().map(|p| name_from_pat(&**p)).collect::<Vec<String>>().join(", ")
445 PatKind::Box(ref p) => name_from_pat(&**p),
446 PatKind::Ref(ref p, _) => name_from_pat(&**p),
447 PatKind::Lit(..) => {
449 "tried to get argument name from PatKind::Lit, \
450 which is silly in function arguments"
454 PatKind::Range(..) => panic!(
455 "tried to get argument name from PatKind::Range, \
456 which is not allowed in function arguments"
458 PatKind::Slice(ref begin, ref mid, ref end) => {
459 let begin = begin.iter().map(|p| name_from_pat(&**p));
460 let mid = mid.as_ref().map(|p| format!("..{}", name_from_pat(&**p))).into_iter();
461 let end = end.iter().map(|p| name_from_pat(&**p));
462 format!("[{}]", begin.chain(mid).chain(end).collect::<Vec<_>>().join(", "))
467 pub fn print_const(cx: &DocContext<'_>, n: &'tcx ty::Const<'_>) -> String {
469 ty::ConstKind::Unevaluated(def, _, promoted) => {
470 let mut s = if let Some(def) = def.as_local() {
471 let hir_id = cx.tcx.hir().as_local_hir_id(def.did);
472 print_const_expr(cx, cx.tcx.hir().body_owned_by(hir_id))
474 inline::print_inlined_const(cx, def.did)
476 if let Some(promoted) = promoted {
477 s.push_str(&format!("::{:?}", promoted))
482 let mut s = n.to_string();
483 // array lengths are obviously usize
484 if s.ends_with("_usize") {
485 let n = s.len() - "_usize".len();
487 if s.ends_with(": ") {
488 let n = s.len() - ": ".len();
497 pub fn print_evaluated_const(cx: &DocContext<'_>, def_id: DefId) -> Option<String> {
498 cx.tcx.const_eval_poly(def_id).ok().and_then(|val| {
499 let ty = cx.tcx.type_of(def_id);
500 match (val, &ty.kind) {
501 (_, &ty::Ref(..)) => None,
502 (ConstValue::Scalar(_), &ty::Adt(_, _)) => None,
503 (ConstValue::Scalar(_), _) => {
504 let const_ = ty::Const::from_value(cx.tcx, val, ty);
505 Some(print_const_with_custom_print_scalar(cx, const_))
512 fn format_integer_with_underscore_sep(num: &str) -> String {
513 let num_chars: Vec<_> = num.chars().collect();
514 let num_start_index = if num_chars.get(0) == Some(&'-') { 1 } else { 0 };
516 num_chars[..num_start_index]
518 .chain(num_chars[num_start_index..].rchunks(3).rev().intersperse(&['_']).flatten())
522 fn print_const_with_custom_print_scalar(cx: &DocContext<'_>, ct: &'tcx ty::Const<'tcx>) -> String {
523 // Use a slightly different format for integer types which always shows the actual value.
524 // For all other types, fallback to the original `pretty_print_const`.
525 match (ct.val, &ct.ty.kind) {
526 (ty::ConstKind::Value(ConstValue::Scalar(Scalar::Raw { data, .. })), ty::Uint(ui)) => {
527 format!("{}{}", format_integer_with_underscore_sep(&data.to_string()), ui.name_str())
529 (ty::ConstKind::Value(ConstValue::Scalar(Scalar::Raw { data, .. })), ty::Int(i)) => {
530 let ty = cx.tcx.lift(&ct.ty).unwrap();
531 let size = cx.tcx.layout_of(ty::ParamEnv::empty().and(ty)).unwrap().size;
532 let sign_extended_data = sign_extend(data, size) as i128;
536 format_integer_with_underscore_sep(&sign_extended_data.to_string()),
544 pub fn is_literal_expr(cx: &DocContext<'_>, hir_id: hir::HirId) -> bool {
545 if let hir::Node::Expr(expr) = cx.tcx.hir().get(hir_id) {
546 if let hir::ExprKind::Lit(_) = &expr.kind {
550 if let hir::ExprKind::Unary(hir::UnOp::UnNeg, expr) = &expr.kind {
551 if let hir::ExprKind::Lit(_) = &expr.kind {
560 pub fn print_const_expr(cx: &DocContext<'_>, body: hir::BodyId) -> String {
561 let value = &cx.tcx.hir().body(body).value;
563 let snippet = if !value.span.from_expansion() {
564 cx.sess().source_map().span_to_snippet(value.span).ok()
569 snippet.unwrap_or_else(|| rustc_hir_pretty::id_to_string(&cx.tcx.hir(), body.hir_id))
572 /// Given a type Path, resolve it to a Type using the TyCtxt
573 pub fn resolve_type(cx: &DocContext<'_>, path: Path, id: hir::HirId) -> Type {
574 debug!("resolve_type({:?},{:?})", path, id);
576 let is_generic = match path.res {
577 Res::PrimTy(p) => return Primitive(PrimitiveType::from(p)),
578 Res::SelfTy(..) if path.segments.len() == 1 => {
579 return Generic(kw::SelfUpper.to_string());
581 Res::Def(DefKind::TyParam, _) if path.segments.len() == 1 => {
582 return Generic(format!("{:#}", path.print()));
584 Res::SelfTy(..) | Res::Def(DefKind::TyParam | DefKind::AssocTy, _) => true,
587 let did = register_res(&*cx, path.res);
588 ResolvedPath { path, param_names: None, did, is_generic }
591 pub fn get_auto_trait_and_blanket_impls(
592 cx: &DocContext<'tcx>,
594 param_env_def_id: DefId,
595 ) -> impl Iterator<Item = Item> {
596 AutoTraitFinder::new(cx)
597 .get_auto_trait_impls(ty, param_env_def_id)
599 .chain(BlanketImplFinder::new(cx).get_blanket_impls(ty, param_env_def_id))
602 pub fn register_res(cx: &DocContext<'_>, res: Res) -> DefId {
603 debug!("register_res({:?})", res);
605 let (did, kind) = match res {
606 Res::Def(DefKind::Fn, i) => (i, TypeKind::Function),
607 Res::Def(DefKind::TyAlias, i) => (i, TypeKind::Typedef),
608 Res::Def(DefKind::Enum, i) => (i, TypeKind::Enum),
609 Res::Def(DefKind::Trait, i) => (i, TypeKind::Trait),
610 Res::Def(DefKind::AssocTy | DefKind::AssocFn | DefKind::AssocConst, i) => {
611 (cx.tcx.parent(i).unwrap(), TypeKind::Trait)
613 Res::Def(DefKind::Struct, i) => (i, TypeKind::Struct),
614 Res::Def(DefKind::Union, i) => (i, TypeKind::Union),
615 Res::Def(DefKind::Mod, i) => (i, TypeKind::Module),
616 Res::Def(DefKind::ForeignTy, i) => (i, TypeKind::Foreign),
617 Res::Def(DefKind::Const, i) => (i, TypeKind::Const),
618 Res::Def(DefKind::Static, i) => (i, TypeKind::Static),
619 Res::Def(DefKind::Variant, i) => {
620 (cx.tcx.parent(i).expect("cannot get parent def id"), TypeKind::Enum)
622 Res::Def(DefKind::Macro(mac_kind), i) => match mac_kind {
623 MacroKind::Bang => (i, TypeKind::Macro),
624 MacroKind::Attr => (i, TypeKind::Attr),
625 MacroKind::Derive => (i, TypeKind::Derive),
627 Res::Def(DefKind::TraitAlias, i) => (i, TypeKind::TraitAlias),
628 Res::SelfTy(Some(def_id), _) => (def_id, TypeKind::Trait),
629 Res::SelfTy(_, Some(impl_def_id)) => return impl_def_id,
630 _ => return res.def_id(),
635 inline::record_extern_fqn(cx, did, kind);
636 if let TypeKind::Trait = kind {
637 inline::record_extern_trait(cx, did);
642 pub fn resolve_use_source(cx: &DocContext<'_>, path: Path) -> ImportSource {
644 did: if path.res.opt_def_id().is_none() { None } else { Some(register_res(cx, path.res)) },
649 pub fn enter_impl_trait<F, R>(cx: &DocContext<'_>, f: F) -> R
653 let old_bounds = mem::take(&mut *cx.impl_trait_bounds.borrow_mut());
655 assert!(cx.impl_trait_bounds.borrow().is_empty());
656 *cx.impl_trait_bounds.borrow_mut() = old_bounds;