src/librustdoc/json/conversions.rs

   1 //! These from impls are used to create the JSON types which get serialized. They're very close to
   2 //! the `clean` types but with some fields removed or stringified to simplify the output and not
   3 //! expose unstable compiler internals.
   4
   5 #![allow(rustc::default_hash_types)]
   6
   7 use std::convert::From;
   8 use std::fmt;
   9
  10 use rustc_ast::ast;
  11 use rustc_hir::{def::CtorKind, def_id::DefId};
  12 use rustc_middle::ty::{self, TyCtxt};
  13 use rustc_span::{Pos, Symbol};
  14 use rustc_target::spec::abi::Abi as RustcAbi;
  15
  16 use rustdoc_json_types::*;
  17
  18 use crate::clean::utils::print_const_expr;
  19 use crate::clean::{self, ItemId};
  20 use crate::formats::item_type::ItemType;
  21 use crate::json::JsonRenderer;
  22 use crate::passes::collect_intra_doc_links::UrlFragment;
  23
  24 impl JsonRenderer<'_> {
  25     pub(super) fn convert_item(&self, item: clean::Item) -> Option<Item> {
  26         let deprecation = item.deprecation(self.tcx);
  27         let links = self
  28             .cache
  29             .intra_doc_links
  30             .get(&item.item_id)
  31             .into_iter()
  32             .flatten()
  33             .map(|clean::ItemLink { link, page_id, fragment, .. }| {
  34                 let id = match fragment {
  35                     Some(UrlFragment::Item(frag_id)) => *frag_id,
  36                     // FIXME: Pass the `UserWritten` segment to JSON consumer.
  37                     Some(UrlFragment::UserWritten(_)) | None => *page_id,
  38                 };
  39
  40                 (link.clone(), from_item_id(id.into(), self.tcx))
  41             })
  42             .collect();
  43         let docs = item.attrs.collapsed_doc_value();
  44         let attrs = item
  45             .attrs
  46             .other_attrs
  47             .iter()
  48             .map(rustc_ast_pretty::pprust::attribute_to_string)
  49             .collect();
  50         let span = item.span(self.tcx);
  51         let visibility = item.visibility(self.tcx);
  52         let clean::Item { name, attrs: _, kind: _, item_id, cfg: _, .. } = item;
  53         let inner = match *item.kind {
  54             clean::KeywordItem => return None,
  55             clean::StrippedItem(ref inner) => {
  56                 match &**inner {
  57                     // We document stripped modules as with `Module::is_stripped` set to
  58                     // `true`, to prevent contained items from being orphaned for downstream users,
  59                     // as JSON does no inlining.
  60                     clean::ModuleItem(_)
  61                         if self.imported_items.contains(&item_id.expect_def_id()) =>
  62                     {
  63                         from_clean_item(item, self.tcx)
  64                     }
  65                     _ => return None,
  66                 }
  67             }
  68             _ => from_clean_item(item, self.tcx),
  69         };
  70         Some(Item {
  71             id: from_item_id_with_name(item_id, self.tcx, name),
  72             crate_id: item_id.krate().as_u32(),
  73             name: name.map(|sym| sym.to_string()),
  74             span: span.and_then(|span| self.convert_span(span)),
  75             visibility: self.convert_visibility(visibility),
  76             docs,
  77             attrs,
  78             deprecation: deprecation.map(from_deprecation),
  79             inner,
  80             links,
  81         })
  82     }
  83
  84     fn convert_span(&self, span: clean::Span) -> Option<Span> {
  85         match span.filename(self.sess()) {
  86             rustc_span::FileName::Real(name) => {
  87                 if let Some(local_path) = name.into_local_path() {
  88                     let hi = span.hi(self.sess());
  89                     let lo = span.lo(self.sess());
  90                     Some(Span {
  91                         filename: local_path,
  92                         begin: (lo.line, lo.col.to_usize()),
  93                         end: (hi.line, hi.col.to_usize()),
  94                     })
  95                 } else {
  96                     None
  97                 }
  98             }
  99             _ => None,
 100         }
 101     }
 102
 103     fn convert_visibility(&self, v: Option<ty::Visibility<DefId>>) -> Visibility {
 104         match v {
 105             None => Visibility::Default,
 106             Some(ty::Visibility::Public) => Visibility::Public,
 107             Some(ty::Visibility::Restricted(did)) if did.is_crate_root() => Visibility::Crate,
 108             Some(ty::Visibility::Restricted(did)) => Visibility::Restricted {
 109                 parent: from_item_id(did.into(), self.tcx),
 110                 path: self.tcx.def_path(did).to_string_no_crate_verbose(),
 111             },
 112         }
 113     }
 114 }
 115
 116 pub(crate) trait FromWithTcx<T> {
 117     fn from_tcx(f: T, tcx: TyCtxt<'_>) -> Self;
 118 }
 119
 120 pub(crate) trait IntoWithTcx<T> {
 121     fn into_tcx(self, tcx: TyCtxt<'_>) -> T;
 122 }
 123
 124 impl<T, U> IntoWithTcx<U> for T
 125 where
 126     U: FromWithTcx<T>,
 127 {
 128     fn into_tcx(self, tcx: TyCtxt<'_>) -> U {
 129         U::from_tcx(self, tcx)
 130     }
 131 }
 132
 133 impl<I, T, U> FromWithTcx<I> for Vec<U>
 134 where
 135     I: IntoIterator<Item = T>,
 136     U: FromWithTcx<T>,
 137 {
 138     fn from_tcx(f: I, tcx: TyCtxt<'_>) -> Vec<U> {
 139         f.into_iter().map(|x| x.into_tcx(tcx)).collect()
 140     }
 141 }
 142
 143 pub(crate) fn from_deprecation(deprecation: rustc_attr::Deprecation) -> Deprecation {
 144     #[rustfmt::skip]
 145     let rustc_attr::Deprecation { since, note, is_since_rustc_version: _, suggestion: _ } = deprecation;
 146     Deprecation { since: since.map(|s| s.to_string()), note: note.map(|s| s.to_string()) }
 147 }
 148
 149 impl FromWithTcx<clean::GenericArgs> for GenericArgs {
 150     fn from_tcx(args: clean::GenericArgs, tcx: TyCtxt<'_>) -> Self {
 151         use clean::GenericArgs::*;
 152         match args {
 153             AngleBracketed { args, bindings } => GenericArgs::AngleBracketed {
 154                 args: args.into_vec().into_tcx(tcx),
 155                 bindings: bindings.into_tcx(tcx),
 156             },
 157             Parenthesized { inputs, output } => GenericArgs::Parenthesized {
 158                 inputs: inputs.into_vec().into_tcx(tcx),
 159                 output: output.map(|a| (*a).into_tcx(tcx)),
 160             },
 161         }
 162     }
 163 }
 164
 165 impl FromWithTcx<clean::GenericArg> for GenericArg {
 166     fn from_tcx(arg: clean::GenericArg, tcx: TyCtxt<'_>) -> Self {
 167         use clean::GenericArg::*;
 168         match arg {
 169             Lifetime(l) => GenericArg::Lifetime(convert_lifetime(l)),
 170             Type(t) => GenericArg::Type(t.into_tcx(tcx)),
 171             Const(box c) => GenericArg::Const(c.into_tcx(tcx)),
 172             Infer => GenericArg::Infer,
 173         }
 174     }
 175 }
 176
 177 impl FromWithTcx<clean::Constant> for Constant {
 178     fn from_tcx(constant: clean::Constant, tcx: TyCtxt<'_>) -> Self {
 179         let expr = constant.expr(tcx);
 180         let value = constant.value(tcx);
 181         let is_literal = constant.is_literal(tcx);
 182         Constant { type_: constant.type_.into_tcx(tcx), expr, value, is_literal }
 183     }
 184 }
 185
 186 impl FromWithTcx<clean::TypeBinding> for TypeBinding {
 187     fn from_tcx(binding: clean::TypeBinding, tcx: TyCtxt<'_>) -> Self {
 188         TypeBinding {
 189             name: binding.assoc.name.to_string(),
 190             args: binding.assoc.args.into_tcx(tcx),
 191             binding: binding.kind.into_tcx(tcx),
 192         }
 193     }
 194 }
 195
 196 impl FromWithTcx<clean::TypeBindingKind> for TypeBindingKind {
 197     fn from_tcx(kind: clean::TypeBindingKind, tcx: TyCtxt<'_>) -> Self {
 198         use clean::TypeBindingKind::*;
 199         match kind {
 200             Equality { term } => TypeBindingKind::Equality(term.into_tcx(tcx)),
 201             Constraint { bounds } => TypeBindingKind::Constraint(bounds.into_tcx(tcx)),
 202         }
 203     }
 204 }
 205
 206 /// It generates an ID as follows:
 207 ///
 208 /// `CRATE_ID:ITEM_ID[:NAME_ID]` (if there is no name, NAME_ID is not generated).
 209 pub(crate) fn from_item_id(item_id: ItemId, tcx: TyCtxt<'_>) -> Id {
 210     from_item_id_with_name(item_id, tcx, None)
 211 }
 212
 213 // FIXME: this function (and appending the name at the end of the ID) should be removed when
 214 // reexports are not inlined anymore for json format. It should be done in #93518.
 215 pub(crate) fn from_item_id_with_name(item_id: ItemId, tcx: TyCtxt<'_>, name: Option<Symbol>) -> Id {
 216     struct DisplayDefId<'a>(DefId, TyCtxt<'a>, Option<Symbol>);
 217
 218     impl<'a> fmt::Display for DisplayDefId<'a> {
 219         fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 220             let name = match self.2 {
 221                 Some(name) => format!(":{}", name.as_u32()),
 222                 None => self
 223                     .1
 224                     .opt_item_name(self.0)
 225                     .map(|n| format!(":{}", n.as_u32()))
 226                     .unwrap_or_default(),
 227             };
 228             write!(f, "{}:{}{}", self.0.krate.as_u32(), u32::from(self.0.index), name)
 229         }
 230     }
 231
 232     match item_id {
 233         ItemId::DefId(did) => Id(format!("{}", DisplayDefId(did, tcx, name))),
 234         ItemId::Blanket { for_, impl_id } => {
 235             Id(format!("b:{}-{}", DisplayDefId(impl_id, tcx, None), DisplayDefId(for_, tcx, name)))
 236         }
 237         ItemId::Auto { for_, trait_ } => {
 238             Id(format!("a:{}-{}", DisplayDefId(trait_, tcx, None), DisplayDefId(for_, tcx, name)))
 239         }
 240         ItemId::Primitive(ty, krate) => Id(format!("p:{}:{}", krate.as_u32(), ty.as_sym())),
 241     }
 242 }
 243
 244 fn from_clean_item(item: clean::Item, tcx: TyCtxt<'_>) -> ItemEnum {
 245     use clean::ItemKind::*;
 246     let name = item.name;
 247     let is_crate = item.is_crate();
 248     let header = item.fn_header(tcx);
 249
 250     match *item.kind {
 251         ModuleItem(m) => {
 252             ItemEnum::Module(Module { is_crate, items: ids(m.items, tcx), is_stripped: false })
 253         }
 254         ImportItem(i) => ItemEnum::Import(i.into_tcx(tcx)),
 255         StructItem(s) => ItemEnum::Struct(s.into_tcx(tcx)),
 256         UnionItem(u) => ItemEnum::Union(u.into_tcx(tcx)),
 257         StructFieldItem(f) => ItemEnum::StructField(f.into_tcx(tcx)),
 258         EnumItem(e) => ItemEnum::Enum(e.into_tcx(tcx)),
 259         VariantItem(v) => ItemEnum::Variant(v.into_tcx(tcx)),
 260         FunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 261         ForeignFunctionItem(f) => ItemEnum::Function(from_function(f, header.unwrap(), tcx)),
 262         TraitItem(t) => ItemEnum::Trait((*t).into_tcx(tcx)),
 263         TraitAliasItem(t) => ItemEnum::TraitAlias(t.into_tcx(tcx)),
 264         MethodItem(m, _) => ItemEnum::Method(from_function_method(m, true, header.unwrap(), tcx)),
 265         TyMethodItem(m) => ItemEnum::Method(from_function_method(m, false, header.unwrap(), tcx)),
 266         ImplItem(i) => ItemEnum::Impl((*i).into_tcx(tcx)),
 267         StaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 268         ForeignStaticItem(s) => ItemEnum::Static(s.into_tcx(tcx)),
 269         ForeignTypeItem => ItemEnum::ForeignType,
 270         TypedefItem(t) => ItemEnum::Typedef(t.into_tcx(tcx)),
 271         OpaqueTyItem(t) => ItemEnum::OpaqueTy(t.into_tcx(tcx)),
 272         ConstantItem(c) => ItemEnum::Constant(c.into_tcx(tcx)),
 273         MacroItem(m) => ItemEnum::Macro(m.source),
 274         ProcMacroItem(m) => ItemEnum::ProcMacro(m.into_tcx(tcx)),
 275         PrimitiveItem(p) => {
 276             ItemEnum::Primitive(Primitive {
 277                 name: p.as_sym().to_string(),
 278                 impls: Vec::new(), // Added in JsonRenderer::item
 279             })
 280         }
 281         TyAssocConstItem(ty) => ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: None },
 282         AssocConstItem(ty, default) => {
 283             ItemEnum::AssocConst { type_: ty.into_tcx(tcx), default: Some(default.expr(tcx)) }
 284         }
 285         TyAssocTypeItem(g, b) => ItemEnum::AssocType {
 286             generics: g.into_tcx(tcx),
 287             bounds: b.into_tcx(tcx),
 288             default: None,
 289         },
 290         AssocTypeItem(t, b) => ItemEnum::AssocType {
 291             generics: t.generics.into_tcx(tcx),
 292             bounds: b.into_tcx(tcx),
 293             default: Some(t.item_type.unwrap_or(t.type_).into_tcx(tcx)),
 294         },
 295         // `convert_item` early returns `None` for stripped items and keywords.
 296         KeywordItem => unreachable!(),
 297         StrippedItem(inner) => {
 298             match *inner {
 299                 ModuleItem(m) => ItemEnum::Module(Module {
 300                     is_crate,
 301                     items: ids(m.items, tcx),
 302                     is_stripped: true,
 303                 }),
 304                 // `convert_item` early returns `None` for stripped items we're not including
 305                 _ => unreachable!(),
 306             }
 307         }
 308         ExternCrateItem { ref src } => ItemEnum::ExternCrate {
 309             name: name.as_ref().unwrap().to_string(),
 310             rename: src.map(|x| x.to_string()),
 311         },
 312     }
 313 }
 314
 315 impl FromWithTcx<clean::Struct> for Struct {
 316     fn from_tcx(struct_: clean::Struct, tcx: TyCtxt<'_>) -> Self {
 317         let fields_stripped = struct_.has_stripped_entries();
 318         let clean::Struct { struct_type, generics, fields } = struct_;
 319
 320         let kind = match struct_type {
 321             CtorKind::Fn => StructKind::Tuple(ids_keeping_stripped(fields, tcx)),
 322             CtorKind::Const => {
 323                 assert!(fields.is_empty());
 324                 StructKind::Unit
 325             }
 326             CtorKind::Fictive => StructKind::Plain { fields: ids(fields, tcx), fields_stripped },
 327         };
 328
 329         Struct {
 330             kind,
 331             generics: generics.into_tcx(tcx),
 332             impls: Vec::new(), // Added in JsonRenderer::item
 333         }
 334     }
 335 }
 336
 337 impl FromWithTcx<clean::Union> for Union {
 338     fn from_tcx(union_: clean::Union, tcx: TyCtxt<'_>) -> Self {
 339         let fields_stripped = union_.has_stripped_entries();
 340         let clean::Union { generics, fields } = union_;
 341         Union {
 342             generics: generics.into_tcx(tcx),
 343             fields_stripped,
 344             fields: ids(fields, tcx),
 345             impls: Vec::new(), // Added in JsonRenderer::item
 346         }
 347     }
 348 }
 349
 350 pub(crate) fn from_fn_header(header: &rustc_hir::FnHeader) -> Header {
 351     Header {
 352         async_: header.is_async(),
 353         const_: header.is_const(),
 354         unsafe_: header.is_unsafe(),
 355         abi: convert_abi(header.abi),
 356     }
 357 }
 358
 359 fn convert_abi(a: RustcAbi) -> Abi {
 360     match a {
 361         RustcAbi::Rust => Abi::Rust,
 362         RustcAbi::C { unwind } => Abi::C { unwind },
 363         RustcAbi::Cdecl { unwind } => Abi::Cdecl { unwind },
 364         RustcAbi::Stdcall { unwind } => Abi::Stdcall { unwind },
 365         RustcAbi::Fastcall { unwind } => Abi::Fastcall { unwind },
 366         RustcAbi::Aapcs { unwind } => Abi::Aapcs { unwind },
 367         RustcAbi::Win64 { unwind } => Abi::Win64 { unwind },
 368         RustcAbi::SysV64 { unwind } => Abi::SysV64 { unwind },
 369         RustcAbi::System { unwind } => Abi::System { unwind },
 370         _ => Abi::Other(a.to_string()),
 371     }
 372 }
 373
 374 fn convert_lifetime(l: clean::Lifetime) -> String {
 375     l.0.to_string()
 376 }
 377
 378 impl FromWithTcx<clean::Generics> for Generics {
 379     fn from_tcx(generics: clean::Generics, tcx: TyCtxt<'_>) -> Self {
 380         Generics {
 381             params: generics.params.into_tcx(tcx),
 382             where_predicates: generics.where_predicates.into_tcx(tcx),
 383         }
 384     }
 385 }
 386
 387 impl FromWithTcx<clean::GenericParamDef> for GenericParamDef {
 388     fn from_tcx(generic_param: clean::GenericParamDef, tcx: TyCtxt<'_>) -> Self {
 389         GenericParamDef {
 390             name: generic_param.name.to_string(),
 391             kind: generic_param.kind.into_tcx(tcx),
 392         }
 393     }
 394 }
 395
 396 impl FromWithTcx<clean::GenericParamDefKind> for GenericParamDefKind {
 397     fn from_tcx(kind: clean::GenericParamDefKind, tcx: TyCtxt<'_>) -> Self {
 398         use clean::GenericParamDefKind::*;
 399         match kind {
 400             Lifetime { outlives } => GenericParamDefKind::Lifetime {
 401                 outlives: outlives.into_iter().map(convert_lifetime).collect(),
 402             },
 403             Type { did: _, bounds, default, synthetic } => GenericParamDefKind::Type {
 404                 bounds: bounds.into_tcx(tcx),
 405                 default: default.map(|x| (*x).into_tcx(tcx)),
 406                 synthetic,
 407             },
 408             Const { did: _, ty, default } => GenericParamDefKind::Const {
 409                 type_: (*ty).into_tcx(tcx),
 410                 default: default.map(|x| *x),
 411             },
 412         }
 413     }
 414 }
 415
 416 impl FromWithTcx<clean::WherePredicate> for WherePredicate {
 417     fn from_tcx(predicate: clean::WherePredicate, tcx: TyCtxt<'_>) -> Self {
 418         use clean::WherePredicate::*;
 419         match predicate {
 420             BoundPredicate { ty, bounds, bound_params } => WherePredicate::BoundPredicate {
 421                 type_: ty.into_tcx(tcx),
 422                 bounds: bounds.into_tcx(tcx),
 423                 generic_params: bound_params
 424                     .into_iter()
 425                     .map(|x| GenericParamDef {
 426                         name: x.0.to_string(),
 427                         kind: GenericParamDefKind::Lifetime { outlives: vec![] },
 428                     })
 429                     .collect(),
 430             },
 431             RegionPredicate { lifetime, bounds } => WherePredicate::RegionPredicate {
 432                 lifetime: convert_lifetime(lifetime),
 433                 bounds: bounds.into_tcx(tcx),
 434             },
 435             // FIXME(fmease): Convert bound parameters as well.
 436             EqPredicate { lhs, rhs, bound_params: _ } => {
 437                 WherePredicate::EqPredicate { lhs: (*lhs).into_tcx(tcx), rhs: (*rhs).into_tcx(tcx) }
 438             }
 439         }
 440     }
 441 }
 442
 443 impl FromWithTcx<clean::GenericBound> for GenericBound {
 444     fn from_tcx(bound: clean::GenericBound, tcx: TyCtxt<'_>) -> Self {
 445         use clean::GenericBound::*;
 446         match bound {
 447             TraitBound(clean::PolyTrait { trait_, generic_params }, modifier) => {
 448                 GenericBound::TraitBound {
 449                     trait_: trait_.into_tcx(tcx),
 450                     generic_params: generic_params.into_tcx(tcx),
 451                     modifier: from_trait_bound_modifier(modifier),
 452                 }
 453             }
 454             Outlives(lifetime) => GenericBound::Outlives(convert_lifetime(lifetime)),
 455         }
 456     }
 457 }
 458
 459 pub(crate) fn from_trait_bound_modifier(
 460     modifier: rustc_hir::TraitBoundModifier,
 461 ) -> TraitBoundModifier {
 462     use rustc_hir::TraitBoundModifier::*;
 463     match modifier {
 464         None => TraitBoundModifier::None,
 465         Maybe => TraitBoundModifier::Maybe,
 466         MaybeConst => TraitBoundModifier::MaybeConst,
 467     }
 468 }
 469
 470 impl FromWithTcx<clean::Type> for Type {
 471     fn from_tcx(ty: clean::Type, tcx: TyCtxt<'_>) -> Self {
 472         use clean::Type::{
 473             Array, BareFunction, BorrowedRef, Generic, ImplTrait, Infer, Primitive, QPath,
 474             RawPointer, Slice, Tuple,
 475         };
 476
 477         match ty {
 478             clean::Type::Path { path } => Type::ResolvedPath(path.into_tcx(tcx)),
 479             clean::Type::DynTrait(bounds, lt) => Type::DynTrait(DynTrait {
 480                 lifetime: lt.map(convert_lifetime),
 481                 traits: bounds.into_tcx(tcx),
 482             }),
 483             Generic(s) => Type::Generic(s.to_string()),
 484             Primitive(p) => Type::Primitive(p.as_sym().to_string()),
 485             BareFunction(f) => Type::FunctionPointer(Box::new((*f).into_tcx(tcx))),
 486             Tuple(t) => Type::Tuple(t.into_tcx(tcx)),
 487             Slice(t) => Type::Slice(Box::new((*t).into_tcx(tcx))),
 488             Array(t, s) => Type::Array { type_: Box::new((*t).into_tcx(tcx)), len: s.to_string() },
 489             ImplTrait(g) => Type::ImplTrait(g.into_tcx(tcx)),
 490             Infer => Type::Infer,
 491             RawPointer(mutability, type_) => Type::RawPointer {
 492                 mutable: mutability == ast::Mutability::Mut,
 493                 type_: Box::new((*type_).into_tcx(tcx)),
 494             },
 495             BorrowedRef { lifetime, mutability, type_ } => Type::BorrowedRef {
 496                 lifetime: lifetime.map(convert_lifetime),
 497                 mutable: mutability == ast::Mutability::Mut,
 498                 type_: Box::new((*type_).into_tcx(tcx)),
 499             },
 500             QPath(box clean::QPathData { assoc, self_type, trait_, .. }) => Type::QualifiedPath {
 501                 name: assoc.name.to_string(),
 502                 args: Box::new(assoc.args.into_tcx(tcx)),
 503                 self_type: Box::new(self_type.into_tcx(tcx)),
 504                 trait_: trait_.into_tcx(tcx),
 505             },
 506         }
 507     }
 508 }
 509
 510 impl FromWithTcx<clean::Path> for Path {
 511     fn from_tcx(path: clean::Path, tcx: TyCtxt<'_>) -> Path {
 512         Path {
 513             name: path.whole_name(),
 514             id: from_item_id(path.def_id().into(), tcx),
 515             args: path.segments.last().map(|args| Box::new(args.clone().args.into_tcx(tcx))),
 516         }
 517     }
 518 }
 519
 520 impl FromWithTcx<clean::Term> for Term {
 521     fn from_tcx(term: clean::Term, tcx: TyCtxt<'_>) -> Term {
 522         match term {
 523             clean::Term::Type(ty) => Term::Type(FromWithTcx::from_tcx(ty, tcx)),
 524             clean::Term::Constant(c) => Term::Constant(FromWithTcx::from_tcx(c, tcx)),
 525         }
 526     }
 527 }
 528
 529 impl FromWithTcx<clean::BareFunctionDecl> for FunctionPointer {
 530     fn from_tcx(bare_decl: clean::BareFunctionDecl, tcx: TyCtxt<'_>) -> Self {
 531         let clean::BareFunctionDecl { unsafety, generic_params, decl, abi } = bare_decl;
 532         FunctionPointer {
 533             header: Header {
 534                 unsafe_: matches!(unsafety, rustc_hir::Unsafety::Unsafe),
 535                 const_: false,
 536                 async_: false,
 537                 abi: convert_abi(abi),
 538             },
 539             generic_params: generic_params.into_tcx(tcx),
 540             decl: decl.into_tcx(tcx),
 541         }
 542     }
 543 }
 544
 545 impl FromWithTcx<clean::FnDecl> for FnDecl {
 546     fn from_tcx(decl: clean::FnDecl, tcx: TyCtxt<'_>) -> Self {
 547         let clean::FnDecl { inputs, output, c_variadic } = decl;
 548         FnDecl {
 549             inputs: inputs
 550                 .values
 551                 .into_iter()
 552                 .map(|arg| (arg.name.to_string(), arg.type_.into_tcx(tcx)))
 553                 .collect(),
 554             output: match output {
 555                 clean::FnRetTy::Return(t) => Some(t.into_tcx(tcx)),
 556                 clean::FnRetTy::DefaultReturn => None,
 557             },
 558             c_variadic,
 559         }
 560     }
 561 }
 562
 563 impl FromWithTcx<clean::Trait> for Trait {
 564     fn from_tcx(trait_: clean::Trait, tcx: TyCtxt<'_>) -> Self {
 565         let is_auto = trait_.is_auto(tcx);
 566         let is_unsafe = trait_.unsafety(tcx) == rustc_hir::Unsafety::Unsafe;
 567         let clean::Trait { items, generics, bounds, .. } = trait_;
 568         Trait {
 569             is_auto,
 570             is_unsafe,
 571             items: ids(items, tcx),
 572             generics: generics.into_tcx(tcx),
 573             bounds: bounds.into_tcx(tcx),
 574             implementations: Vec::new(), // Added in JsonRenderer::item
 575         }
 576     }
 577 }
 578
 579 impl FromWithTcx<clean::PolyTrait> for PolyTrait {
 580     fn from_tcx(
 581         clean::PolyTrait { trait_, generic_params }: clean::PolyTrait,
 582         tcx: TyCtxt<'_>,
 583     ) -> Self {
 584         PolyTrait { trait_: trait_.into_tcx(tcx), generic_params: generic_params.into_tcx(tcx) }
 585     }
 586 }
 587
 588 impl FromWithTcx<clean::Impl> for Impl {
 589     fn from_tcx(impl_: clean::Impl, tcx: TyCtxt<'_>) -> Self {
 590         let provided_trait_methods = impl_.provided_trait_methods(tcx);
 591         let clean::Impl { unsafety, generics, trait_, for_, items, polarity, kind } = impl_;
 592         // FIXME: use something like ImplKind in JSON?
 593         let (synthetic, blanket_impl) = match kind {
 594             clean::ImplKind::Normal | clean::ImplKind::FakeVaradic => (false, None),
 595             clean::ImplKind::Auto => (true, None),
 596             clean::ImplKind::Blanket(ty) => (false, Some(*ty)),
 597         };
 598         let negative_polarity = match polarity {
 599             ty::ImplPolarity::Positive | ty::ImplPolarity::Reservation => false,
 600             ty::ImplPolarity::Negative => true,
 601         };
 602         Impl {
 603             is_unsafe: unsafety == rustc_hir::Unsafety::Unsafe,
 604             generics: generics.into_tcx(tcx),
 605             provided_trait_methods: provided_trait_methods
 606                 .into_iter()
 607                 .map(|x| x.to_string())
 608                 .collect(),
 609             trait_: trait_.map(|path| path.into_tcx(tcx)),
 610             for_: for_.into_tcx(tcx),
 611             items: ids(items, tcx),
 612             negative: negative_polarity,
 613             synthetic,
 614             blanket_impl: blanket_impl.map(|x| x.into_tcx(tcx)),
 615         }
 616     }
 617 }
 618
 619 pub(crate) fn from_function(
 620     function: Box<clean::Function>,
 621     header: rustc_hir::FnHeader,
 622     tcx: TyCtxt<'_>,
 623 ) -> Function {
 624     let clean::Function { decl, generics } = *function;
 625     Function {
 626         decl: decl.into_tcx(tcx),
 627         generics: generics.into_tcx(tcx),
 628         header: from_fn_header(&header),
 629     }
 630 }
 631
 632 pub(crate) fn from_function_method(
 633     function: Box<clean::Function>,
 634     has_body: bool,
 635     header: rustc_hir::FnHeader,
 636     tcx: TyCtxt<'_>,
 637 ) -> Method {
 638     let clean::Function { decl, generics } = *function;
 639     Method {
 640         decl: decl.into_tcx(tcx),
 641         generics: generics.into_tcx(tcx),
 642         header: from_fn_header(&header),
 643         has_body,
 644     }
 645 }
 646
 647 impl FromWithTcx<clean::Enum> for Enum {
 648     fn from_tcx(enum_: clean::Enum, tcx: TyCtxt<'_>) -> Self {
 649         let variants_stripped = enum_.has_stripped_entries();
 650         let clean::Enum { variants, generics } = enum_;
 651         Enum {
 652             generics: generics.into_tcx(tcx),
 653             variants_stripped,
 654             variants: ids(variants, tcx),
 655             impls: Vec::new(), // Added in JsonRenderer::item
 656         }
 657     }
 658 }
 659
 660 impl FromWithTcx<clean::Variant> for Variant {
 661     fn from_tcx(variant: clean::Variant, tcx: TyCtxt<'_>) -> Self {
 662         use clean::Variant::*;
 663         match variant {
 664             CLike(disr) => Variant::Plain(disr.map(|disr| disr.into_tcx(tcx))),
 665             Tuple(fields) => Variant::Tuple(ids_keeping_stripped(fields, tcx)),
 666             Struct(s) => Variant::Struct {
 667                 fields_stripped: s.has_stripped_entries(),
 668                 fields: ids(s.fields, tcx),
 669             },
 670         }
 671     }
 672 }
 673
 674 impl FromWithTcx<clean::Discriminant> for Discriminant {
 675     fn from_tcx(disr: clean::Discriminant, tcx: TyCtxt<'_>) -> Self {
 676         Discriminant {
 677             // expr is only none if going throught the inlineing path, which gets
 678             // `rustc_middle` types, not `rustc_hir`, but because JSON never inlines
 679             // the expr is always some.
 680             expr: disr.expr(tcx).unwrap(),
 681             value: disr.value(tcx),
 682         }
 683     }
 684 }
 685
 686 impl FromWithTcx<clean::Import> for Import {
 687     fn from_tcx(import: clean::Import, tcx: TyCtxt<'_>) -> Self {
 688         use clean::ImportKind::*;
 689         let (name, glob) = match import.kind {
 690             Simple(s) => (s.to_string(), false),
 691             Glob => (
 692                 import.source.path.last_opt().unwrap_or_else(|| Symbol::intern("*")).to_string(),
 693                 true,
 694             ),
 695         };
 696         Import {
 697             source: import.source.path.whole_name(),
 698             name,
 699             id: import.source.did.map(ItemId::from).map(|i| from_item_id(i, tcx)),
 700             glob,
 701         }
 702     }
 703 }
 704
 705 impl FromWithTcx<clean::ProcMacro> for ProcMacro {
 706     fn from_tcx(mac: clean::ProcMacro, _tcx: TyCtxt<'_>) -> Self {
 707         ProcMacro {
 708             kind: from_macro_kind(mac.kind),
 709             helpers: mac.helpers.iter().map(|x| x.to_string()).collect(),
 710         }
 711     }
 712 }
 713
 714 pub(crate) fn from_macro_kind(kind: rustc_span::hygiene::MacroKind) -> MacroKind {
 715     use rustc_span::hygiene::MacroKind::*;
 716     match kind {
 717         Bang => MacroKind::Bang,
 718         Attr => MacroKind::Attr,
 719         Derive => MacroKind::Derive,
 720     }
 721 }
 722
 723 impl FromWithTcx<Box<clean::Typedef>> for Typedef {
 724     fn from_tcx(typedef: Box<clean::Typedef>, tcx: TyCtxt<'_>) -> Self {
 725         let clean::Typedef { type_, generics, item_type: _ } = *typedef;
 726         Typedef { type_: type_.into_tcx(tcx), generics: generics.into_tcx(tcx) }
 727     }
 728 }
 729
 730 impl FromWithTcx<clean::OpaqueTy> for OpaqueTy {
 731     fn from_tcx(opaque: clean::OpaqueTy, tcx: TyCtxt<'_>) -> Self {
 732         OpaqueTy { bounds: opaque.bounds.into_tcx(tcx), generics: opaque.generics.into_tcx(tcx) }
 733     }
 734 }
 735
 736 impl FromWithTcx<clean::Static> for Static {
 737     fn from_tcx(stat: clean::Static, tcx: TyCtxt<'_>) -> Self {
 738         Static {
 739             type_: stat.type_.into_tcx(tcx),
 740             mutable: stat.mutability == ast::Mutability::Mut,
 741             expr: stat.expr.map(|e| print_const_expr(tcx, e)).unwrap_or_default(),
 742         }
 743     }
 744 }
 745
 746 impl FromWithTcx<clean::TraitAlias> for TraitAlias {
 747     fn from_tcx(alias: clean::TraitAlias, tcx: TyCtxt<'_>) -> Self {
 748         TraitAlias { generics: alias.generics.into_tcx(tcx), params: alias.bounds.into_tcx(tcx) }
 749     }
 750 }
 751
 752 impl FromWithTcx<ItemType> for ItemKind {
 753     fn from_tcx(kind: ItemType, _tcx: TyCtxt<'_>) -> Self {
 754         use ItemType::*;
 755         match kind {
 756             Module => ItemKind::Module,
 757             ExternCrate => ItemKind::ExternCrate,
 758             Import => ItemKind::Import,
 759             Struct => ItemKind::Struct,
 760             Union => ItemKind::Union,
 761             Enum => ItemKind::Enum,
 762             Function => ItemKind::Function,
 763             Typedef => ItemKind::Typedef,
 764             OpaqueTy => ItemKind::OpaqueTy,
 765             Static => ItemKind::Static,
 766             Constant => ItemKind::Constant,
 767             Trait => ItemKind::Trait,
 768             Impl => ItemKind::Impl,
 769             TyMethod | Method => ItemKind::Method,
 770             StructField => ItemKind::StructField,
 771             Variant => ItemKind::Variant,
 772             Macro => ItemKind::Macro,
 773             Primitive => ItemKind::Primitive,
 774             AssocConst => ItemKind::AssocConst,
 775             AssocType => ItemKind::AssocType,
 776             ForeignType => ItemKind::ForeignType,
 777             Keyword => ItemKind::Keyword,
 778             TraitAlias => ItemKind::TraitAlias,
 779             ProcAttribute => ItemKind::ProcAttribute,
 780             ProcDerive => ItemKind::ProcDerive,
 781         }
 782     }
 783 }
 784
 785 fn ids(items: impl IntoIterator<Item = clean::Item>, tcx: TyCtxt<'_>) -> Vec<Id> {
 786     items
 787         .into_iter()
 788         .filter(|x| !x.is_stripped() && !x.is_keyword())
 789         .map(|i| from_item_id_with_name(i.item_id, tcx, i.name))
 790         .collect()
 791 }
 792
 793 fn ids_keeping_stripped(
 794     items: impl IntoIterator<Item = clean::Item>,
 795     tcx: TyCtxt<'_>,
 796 ) -> Vec<Option<Id>> {
 797     items
 798         .into_iter()
 799         .map(|i| {
 800             if !i.is_stripped() && !i.is_keyword() {
 801                 Some(from_item_id_with_name(i.item_id, tcx, i.name))
 802             } else {
 803                 None
 804             }
 805         })
 806         .collect()
 807 }