1 use crate::clean::auto_trait::AutoTraitFinder;
2 use crate::clean::blanket_impl::BlanketImplFinder;
4 inline, Clean, Crate, Deprecation, ExternalCrate, FnDecl, FunctionRetTy, 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::mir::interpret::{sign_extend, ConstValue, Scalar};
13 use rustc::ty::subst::{GenericArgKind, SubstsRef};
14 use rustc::ty::{self, DefIdTree, Ty};
15 use rustc_data_structures::fx::FxHashSet;
17 use rustc_hir::def::{DefKind, Res};
18 use rustc_hir::def_id::{DefId, LOCAL_CRATE};
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 libsyntax AST to one that is
43 // understood by rustdoc.
44 let mut module = module.clean(cx);
45 let mut masked_crates = FxHashSet::default();
48 ItemEnum::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.inner {
66 ItemEnum::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 inner: ItemEnum::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 inner: ItemEnum::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).clean(cx)
109 pub fn get_deprecation(cx: &DocContext<'_>, def_id: DefId) -> Option<Deprecation> {
110 cx.tcx.lookup_deprecation(def_id).clean(cx)
113 pub 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) => {
126 lt.clean(cx).and_then(|lt| Some(GenericArg::Lifetime(lt)))
128 GenericArgKind::Type(_) if skip_self => {
132 GenericArgKind::Type(ty) => {
133 ty_kind = Some(&ty.kind);
134 Some(GenericArg::Type(ty.clean(cx)))
136 GenericArgKind::Const(ct) => Some(GenericArg::Const(ct.clean(cx))),
141 // Attempt to sugar an external path like Fn<(A, B,), C> to Fn(A, B) -> C
142 Some(did) if cx.tcx.lang_items().fn_trait_kind(did).is_some() => {
143 assert!(ty_kind.is_some());
144 let inputs = match ty_kind {
145 Some(ty::Tuple(ref tys)) => tys.iter().map(|t| t.expect_ty().clean(cx)).collect(),
146 _ => return GenericArgs::AngleBracketed { args, bindings },
149 // FIXME(#20299) return type comes from a projection now
150 // match types[1].kind {
151 // ty::Tuple(ref v) if v.is_empty() => None, // -> ()
152 // _ => Some(types[1].clean(cx))
154 GenericArgs::Parenthesized { inputs, output }
156 _ => GenericArgs::AngleBracketed { args, bindings },
160 // trait_did should be set to a trait's DefId if called on a TraitRef, in order to sugar
161 // from Fn<(A, B,), C> to Fn(A, B) -> C
162 pub fn external_path(
165 trait_did: Option<DefId>,
167 bindings: Vec<TypeBinding>,
168 substs: SubstsRef<'_>,
173 segments: vec![PathSegment {
174 name: name.to_string(),
175 args: external_generic_args(cx, trait_did, has_self, bindings, substs),
180 /// The point of this function is to replace bounds with types.
182 /// i.e. `[T, U]` when you have the following bounds: `T: Display, U: Option<T>` will return
183 /// `[Display, Option]` (we just returns the list of the types, we don't care about the
184 /// wrapped types in here).
185 pub fn get_real_types(
190 ) -> FxHashSet<Type> {
191 let arg_s = arg.print().to_string();
192 let mut res = FxHashSet::default();
194 // FIXME: remove this whole recurse thing when the recursion bug is fixed
197 if arg.is_full_generic() {
198 if let Some(where_pred) = generics.where_predicates.iter().find(|g| match g {
199 &WherePredicate::BoundPredicate { ref ty, .. } => ty.def_id() == arg.def_id(),
202 let bounds = where_pred.get_bounds().unwrap_or_else(|| &[]);
203 for bound in bounds.iter() {
205 GenericBound::TraitBound(ref poly_trait, _) => {
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() {
224 if let Some(bound) = generics.params.iter().find(|g| g.is_type() && g.name == arg_s) {
225 for bound in bound.get_bounds().unwrap_or_else(|| &[]) {
226 if let Some(ty) = bound.get_trait_type() {
227 let adds = get_real_types(generics, &ty, cx, recurse + 1);
228 if !adds.is_empty() {
230 } else if !ty.is_full_generic() {
231 res.insert(ty.clone());
237 res.insert(arg.clone());
238 if let Some(gens) = arg.generics() {
239 for gen in gens.iter() {
240 if gen.is_full_generic() {
241 let adds = get_real_types(generics, gen, cx, recurse + 1);
242 if !adds.is_empty() {
246 res.insert(gen.clone());
254 /// Return the full list of types when bounds have been resolved.
256 /// i.e. `fn foo<A: Display, B: Option<A>>(x: u32, y: B)` will return
257 /// `[u32, Display, Option]`.
258 pub fn get_all_types(
262 ) -> (Vec<Type>, Vec<Type>) {
263 let mut all_types = FxHashSet::default();
264 for arg in decl.inputs.values.iter() {
265 if arg.type_.is_self_type() {
268 let args = get_real_types(generics, &arg.type_, cx, 0);
269 if !args.is_empty() {
270 all_types.extend(args);
272 all_types.insert(arg.type_.clone());
276 let ret_types = match decl.output {
277 FunctionRetTy::Return(ref return_type) => {
278 let mut ret = get_real_types(generics, &return_type, cx, 0);
280 ret.insert(return_type.clone());
282 ret.into_iter().collect()
286 (all_types.into_iter().collect(), ret_types)
289 pub fn strip_type(ty: Type) -> Type {
291 Type::ResolvedPath { path, param_names, did, is_generic } => {
292 Type::ResolvedPath { path: strip_path(&path), param_names, did, is_generic }
294 Type::Tuple(inner_tys) => {
295 Type::Tuple(inner_tys.iter().map(|t| strip_type(t.clone())).collect())
297 Type::Slice(inner_ty) => Type::Slice(Box::new(strip_type(*inner_ty))),
298 Type::Array(inner_ty, s) => Type::Array(Box::new(strip_type(*inner_ty)), s),
299 Type::RawPointer(m, inner_ty) => Type::RawPointer(m, Box::new(strip_type(*inner_ty))),
300 Type::BorrowedRef { lifetime, mutability, type_ } => {
301 Type::BorrowedRef { lifetime, mutability, type_: Box::new(strip_type(*type_)) }
303 Type::QPath { name, self_type, trait_ } => Type::QPath {
305 self_type: Box::new(strip_type(*self_type)),
306 trait_: Box::new(strip_type(*trait_)),
312 pub fn strip_path(path: &Path) -> Path {
316 .map(|s| PathSegment {
317 name: s.name.clone(),
318 args: GenericArgs::AngleBracketed { args: vec![], bindings: vec![] },
322 Path { global: path.global, res: path.res.clone(), segments }
325 pub fn qpath_to_string(p: &hir::QPath) -> String {
326 let segments = match *p {
327 hir::QPath::Resolved(_, ref path) => &path.segments,
328 hir::QPath::TypeRelative(_, ref segment) => return segment.ident.to_string(),
331 let mut s = String::new();
332 for (i, seg) in segments.iter().enumerate() {
336 if seg.ident.name != kw::PathRoot {
337 s.push_str(&seg.ident.as_str());
343 pub fn build_deref_target_impls(cx: &DocContext<'_>, items: &[Item], ret: &mut Vec<Item>) {
344 use self::PrimitiveType::*;
348 let target = match item.inner {
349 ItemEnum::TypedefItem(ref t, true) => &t.type_,
352 let primitive = match *target {
353 ResolvedPath { did, .. } if did.is_local() => continue,
354 ResolvedPath { did, .. } => {
355 ret.extend(inline::build_impls(cx, did, None));
358 _ => match target.primitive_type() {
363 let did = match primitive {
364 Isize => tcx.lang_items().isize_impl(),
365 I8 => tcx.lang_items().i8_impl(),
366 I16 => tcx.lang_items().i16_impl(),
367 I32 => tcx.lang_items().i32_impl(),
368 I64 => tcx.lang_items().i64_impl(),
369 I128 => tcx.lang_items().i128_impl(),
370 Usize => tcx.lang_items().usize_impl(),
371 U8 => tcx.lang_items().u8_impl(),
372 U16 => tcx.lang_items().u16_impl(),
373 U32 => tcx.lang_items().u32_impl(),
374 U64 => tcx.lang_items().u64_impl(),
375 U128 => tcx.lang_items().u128_impl(),
376 F32 => tcx.lang_items().f32_impl(),
377 F64 => tcx.lang_items().f64_impl(),
378 Char => tcx.lang_items().char_impl(),
379 Bool => tcx.lang_items().bool_impl(),
380 Str => tcx.lang_items().str_impl(),
381 Slice => tcx.lang_items().slice_impl(),
382 Array => tcx.lang_items().slice_impl(),
385 RawPointer => tcx.lang_items().const_ptr_impl(),
390 if let Some(did) = did {
392 inline::build_impl(cx, did, None, ret);
399 fn to_src(&self, cx: &DocContext<'_>) -> String;
402 impl ToSource for rustc_span::Span {
403 fn to_src(&self, cx: &DocContext<'_>) -> String {
404 debug!("converting span {:?} to snippet", self.clean(cx));
405 let sn = match cx.sess().source_map().span_to_snippet(*self) {
407 Err(_) => String::new(),
409 debug!("got snippet {}", sn);
414 pub fn name_from_pat(p: &hir::Pat) -> String {
416 debug!("trying to get a name from pattern: {:?}", p);
419 PatKind::Wild => "_".to_string(),
420 PatKind::Binding(_, _, ident, _) => ident.to_string(),
421 PatKind::TupleStruct(ref p, ..) | PatKind::Path(ref p) => qpath_to_string(p),
422 PatKind::Struct(ref name, ref fields, etc) => format!(
424 qpath_to_string(name),
427 .map(|fp| format!("{}: {}", fp.ident, name_from_pat(&fp.pat)))
428 .collect::<Vec<String>>()
430 if etc { ", .." } else { "" }
432 PatKind::Or(ref pats) => {
433 pats.iter().map(|p| name_from_pat(&**p)).collect::<Vec<String>>().join(" | ")
435 PatKind::Tuple(ref elts, _) => format!(
437 elts.iter().map(|p| name_from_pat(&**p)).collect::<Vec<String>>().join(", ")
439 PatKind::Box(ref p) => name_from_pat(&**p),
440 PatKind::Ref(ref p, _) => name_from_pat(&**p),
441 PatKind::Lit(..) => {
443 "tried to get argument name from PatKind::Lit, \
444 which is silly in function arguments"
448 PatKind::Range(..) => panic!(
449 "tried to get argument name from PatKind::Range, \
450 which is not allowed in function arguments"
452 PatKind::Slice(ref begin, ref mid, ref end) => {
453 let begin = begin.iter().map(|p| name_from_pat(&**p));
454 let mid = mid.as_ref().map(|p| format!("..{}", name_from_pat(&**p))).into_iter();
455 let end = end.iter().map(|p| name_from_pat(&**p));
456 format!("[{}]", begin.chain(mid).chain(end).collect::<Vec<_>>().join(", "))
461 pub fn print_const(cx: &DocContext<'_>, n: &ty::Const<'_>) -> String {
463 ty::ConstKind::Unevaluated(def_id, _, promoted) => {
464 let mut s = if let Some(hir_id) = cx.tcx.hir().as_local_hir_id(def_id) {
465 print_const_expr(cx, cx.tcx.hir().body_owned_by(hir_id))
467 inline::print_inlined_const(cx, def_id)
469 if let Some(promoted) = promoted {
470 s.push_str(&format!("::{:?}", promoted))
475 let mut s = n.to_string();
476 // array lengths are obviously usize
477 if s.ends_with("usize") {
478 let n = s.len() - "usize".len();
480 if s.ends_with(": ") {
481 let n = s.len() - ": ".len();
490 pub fn print_evaluated_const(cx: &DocContext<'_>, def_id: DefId) -> Option<String> {
492 cx.tcx.const_eval_poly(def_id).ok().and_then(|value| match (value.val, &value.ty.kind) {
493 (_, ty::Ref(..)) => None,
494 (ty::ConstKind::Value(ConstValue::Scalar(_)), ty::Adt(_, _)) => None,
495 (ty::ConstKind::Value(ConstValue::Scalar(_)), _) => {
496 Some(print_const_with_custom_print_scalar(cx, value))
504 fn format_integer_with_underscore_sep(num: &str) -> String {
505 let num_chars: Vec<_> = num.chars().collect();
506 let num_start_index = if num_chars.get(0) == Some(&'-') { 1 } else { 0 };
508 num_chars[..num_start_index]
510 .chain(num_chars[num_start_index..].rchunks(3).rev().intersperse(&['_']).flatten())
514 fn print_const_with_custom_print_scalar(cx: &DocContext<'_>, ct: &'tcx ty::Const<'tcx>) -> String {
515 // Use a slightly different format for integer types which always shows the actual value.
516 // For all other types, fallback to the original `pretty_print_const`.
517 match (ct.val, &ct.ty.kind) {
518 (ty::ConstKind::Value(ConstValue::Scalar(Scalar::Raw { data, .. })), ty::Uint(ui)) => {
519 format!("{}{}", format_integer_with_underscore_sep(&data.to_string()), ui.name_str())
521 (ty::ConstKind::Value(ConstValue::Scalar(Scalar::Raw { data, .. })), ty::Int(i)) => {
522 let ty = cx.tcx.lift(&ct.ty).unwrap();
523 let size = cx.tcx.layout_of(ty::ParamEnv::empty().and(ty)).unwrap().size;
524 let sign_extended_data = sign_extend(data, size) as i128;
528 format_integer_with_underscore_sep(&sign_extended_data.to_string()),
536 pub fn is_literal_expr(cx: &DocContext<'_>, hir_id: hir::HirId) -> bool {
537 if let hir::Node::Expr(expr) = cx.tcx.hir().get(hir_id) {
538 if let hir::ExprKind::Lit(_) = &expr.kind {
542 if let hir::ExprKind::Unary(hir::UnOp::UnNeg, expr) = &expr.kind {
543 if let hir::ExprKind::Lit(_) = &expr.kind {
552 pub fn print_const_expr(cx: &DocContext<'_>, body: hir::BodyId) -> String {
553 let value = &cx.tcx.hir().body(body).value;
555 let snippet = if !value.span.from_expansion() {
556 cx.sess().source_map().span_to_snippet(value.span).ok()
561 snippet.unwrap_or_else(|| cx.tcx.hir().hir_to_pretty_string(body.hir_id))
564 /// Given a type Path, resolve it to a Type using the TyCtxt
565 pub fn resolve_type(cx: &DocContext<'_>, path: Path, id: hir::HirId) -> Type {
566 if id == hir::DUMMY_HIR_ID {
567 debug!("resolve_type({:?})", path);
569 debug!("resolve_type({:?},{:?})", path, id);
572 let is_generic = match path.res {
573 Res::PrimTy(p) => match p {
574 hir::PrimTy::Str => return Primitive(PrimitiveType::Str),
575 hir::PrimTy::Bool => return Primitive(PrimitiveType::Bool),
576 hir::PrimTy::Char => return Primitive(PrimitiveType::Char),
577 hir::PrimTy::Int(int_ty) => return Primitive(int_ty.into()),
578 hir::PrimTy::Uint(uint_ty) => return Primitive(uint_ty.into()),
579 hir::PrimTy::Float(float_ty) => return Primitive(float_ty.into()),
581 Res::SelfTy(..) if path.segments.len() == 1 => {
582 return Generic(kw::SelfUpper.to_string());
584 Res::Def(DefKind::TyParam, _) if path.segments.len() == 1 => {
585 return Generic(format!("{:#}", path.print()));
587 Res::SelfTy(..) | Res::Def(DefKind::TyParam, _) | Res::Def(DefKind::AssocTy, _) => true,
590 let did = register_res(&*cx, path.res);
591 ResolvedPath { path, param_names: None, did, is_generic }
594 pub fn get_auto_trait_and_blanket_impls(
595 cx: &DocContext<'tcx>,
597 param_env_def_id: DefId,
598 ) -> impl Iterator<Item = Item> {
599 AutoTraitFinder::new(cx)
600 .get_auto_trait_impls(ty, param_env_def_id)
602 .chain(BlanketImplFinder::new(cx).get_blanket_impls(ty, param_env_def_id))
605 pub fn register_res(cx: &DocContext<'_>, res: Res) -> DefId {
606 debug!("register_res({:?})", res);
608 let (did, kind) = match res {
609 Res::Def(DefKind::Fn, i) => (i, TypeKind::Function),
610 Res::Def(DefKind::TyAlias, i) => (i, TypeKind::Typedef),
611 Res::Def(DefKind::Enum, i) => (i, TypeKind::Enum),
612 Res::Def(DefKind::Trait, i) => (i, 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;