compiler/rustc_save_analysis/src/dump_visitor.rs

   1 //! Write the output of rustc's analysis to an implementor of Dump.
   2 //!
   3 //! Dumping the analysis is implemented by walking the AST and getting a bunch of
   4 //! info out from all over the place. We use `DefId`s to identify objects. The
   5 //! tricky part is getting syntactic (span, source text) and semantic (reference
   6 //! `DefId`s) information for parts of expressions which the compiler has discarded.
   7 //! E.g., in a path `foo::bar::baz`, the compiler only keeps a span for the whole
   8 //! path and a reference to `baz`, but we want spans and references for all three
   9 //! idents.
  10 //!
  11 //! SpanUtils is used to manipulate spans. In particular, to extract sub-spans
  12 //! from spans (e.g., the span for `bar` from the above example path).
  13 //! DumpVisitor walks the AST and processes it, and Dumper is used for
  14 //! recording the output.
  15
  16 use rustc_ast as ast;
  17 use rustc_ast::walk_list;
  18 use rustc_data_structures::fx::FxHashSet;
  19 use rustc_hir as hir;
  20 use rustc_hir::def::{DefKind as HirDefKind, Res};
  21 use rustc_hir::def_id::{DefId, LocalDefId, CRATE_DEF_ID};
  22 use rustc_hir::intravisit::{self, Visitor};
  23 use rustc_hir_pretty::{bounds_to_string, fn_to_string, generic_params_to_string, ty_to_string};
  24 use rustc_middle::hir::nested_filter;
  25 use rustc_middle::span_bug;
  26 use rustc_middle::ty::{self, DefIdTree, TyCtxt};
  27 use rustc_session::config::Input;
  28 use rustc_span::symbol::Ident;
  29 use rustc_span::*;
  30
  31 use std::env;
  32 use std::path::Path;
  33
  34 use crate::dumper::{Access, Dumper};
  35 use crate::sig;
  36 use crate::span_utils::SpanUtils;
  37 use crate::{
  38     escape, generated_code, id_from_def_id, id_from_hir_id, lower_attributes, PathCollector,
  39     SaveContext,
  40 };
  41
  42 use rls_data::{
  43     CompilationOptions, CratePreludeData, Def, DefKind, GlobalCrateId, Import, ImportKind, Ref,
  44     RefKind, Relation, RelationKind, SpanData,
  45 };
  46
  47 #[rustfmt::skip] // https://github.com/rust-lang/rustfmt/issues/5213
  48 macro_rules! down_cast_data {
  49     ($id:ident, $kind:ident, $sp:expr) => {
  50         let super::Data::$kind($id) = $id else {
  51             span_bug!($sp, "unexpected data kind: {:?}", $id);
  52         };
  53     };
  54 }
  55
  56 macro_rules! access_from {
  57     ($save_ctxt:expr, $id:expr) => {
  58         Access {
  59             public: $save_ctxt.tcx.visibility($id).is_public(),
  60             reachable: $save_ctxt.effective_visibilities.is_reachable($id),
  61         }
  62     };
  63 }
  64
  65 pub struct DumpVisitor<'tcx> {
  66     pub save_ctxt: SaveContext<'tcx>,
  67     tcx: TyCtxt<'tcx>,
  68     dumper: Dumper,
  69
  70     span: SpanUtils<'tcx>,
  71     // Set of macro definition (callee) spans, and the set
  72     // of macro use (callsite) spans. We store these to ensure
  73     // we only write one macro def per unique macro definition, and
  74     // one macro use per unique callsite span.
  75     // mac_defs: FxHashSet<Span>,
  76     // macro_calls: FxHashSet<Span>,
  77 }
  78
  79 impl<'tcx> DumpVisitor<'tcx> {
  80     pub fn new(save_ctxt: SaveContext<'tcx>) -> DumpVisitor<'tcx> {
  81         let span_utils = SpanUtils::new(&save_ctxt.tcx.sess);
  82         let dumper = Dumper::new(save_ctxt.config.clone());
  83         DumpVisitor { tcx: save_ctxt.tcx, save_ctxt, dumper, span: span_utils }
  84     }
  85
  86     pub fn analysis(&self) -> &rls_data::Analysis {
  87         self.dumper.analysis()
  88     }
  89
  90     fn nest_typeck_results<F>(&mut self, item_def_id: LocalDefId, f: F)
  91     where
  92         F: FnOnce(&mut Self),
  93     {
  94         let typeck_results = if self.tcx.has_typeck_results(item_def_id) {
  95             Some(self.tcx.typeck(item_def_id))
  96         } else {
  97             None
  98         };
  99
 100         let old_maybe_typeck_results = self.save_ctxt.maybe_typeck_results;
 101         self.save_ctxt.maybe_typeck_results = typeck_results;
 102         f(self);
 103         self.save_ctxt.maybe_typeck_results = old_maybe_typeck_results;
 104     }
 105
 106     fn span_from_span(&self, span: Span) -> SpanData {
 107         self.save_ctxt.span_from_span(span)
 108     }
 109
 110     fn lookup_def_id(&self, ref_id: hir::HirId) -> Option<DefId> {
 111         self.save_ctxt.lookup_def_id(ref_id)
 112     }
 113
 114     pub fn dump_crate_info(&mut self, name: Symbol) {
 115         let crate_root = self.tcx.sess.local_crate_source_file().map(|source_file| {
 116             match source_file.file_name() {
 117                 Some(_) => source_file.parent().unwrap().display(),
 118                 None => source_file.display(),
 119             }
 120             .to_string()
 121         });
 122
 123         let data = CratePreludeData {
 124             crate_id: GlobalCrateId {
 125                 name: name.to_string(),
 126                 disambiguator: (self.tcx.sess.local_stable_crate_id().to_u64(), 0),
 127             },
 128             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 129             external_crates: self.save_ctxt.get_external_crates(),
 130             span: self.span_from_span(self.tcx.def_span(CRATE_DEF_ID)),
 131         };
 132
 133         self.dumper.crate_prelude(data);
 134     }
 135
 136     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: Symbol) {
 137         // Apply possible `remap-path-prefix` remapping to the input source file
 138         // (and don't include remapping args anymore)
 139         let (program, arguments) = {
 140             let remap_arg_indices = {
 141                 let mut indices = FxHashSet::default();
 142                 // Args are guaranteed to be valid UTF-8 (checked early)
 143                 for (i, e) in env::args().enumerate() {
 144                     if e.starts_with("--remap-path-prefix=") {
 145                         indices.insert(i);
 146                     } else if e == "--remap-path-prefix" {
 147                         indices.insert(i);
 148                         indices.insert(i + 1);
 149                     }
 150                 }
 151                 indices
 152             };
 153
 154             let mut args = env::args()
 155                 .enumerate()
 156                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 157                 .map(|(_, arg)| match input {
 158                     Input::File(ref path) if path == Path::new(&arg) => self
 159                         .tcx
 160                         .sess
 161                         .local_crate_source_file()
 162                         .as_ref()
 163                         .unwrap()
 164                         .to_string_lossy()
 165                         .into(),
 166                     _ => arg,
 167                 });
 168
 169             (args.next().unwrap(), args.collect())
 170         };
 171
 172         let data = CompilationOptions {
 173             directory: self.tcx.sess.opts.working_dir.remapped_path_if_available().into(),
 174             program,
 175             arguments,
 176             output: self.save_ctxt.compilation_output(crate_name),
 177         };
 178
 179         self.dumper.compilation_opts(data);
 180     }
 181
 182     fn write_segments(&mut self, segments: impl IntoIterator<Item = &'tcx hir::PathSegment<'tcx>>) {
 183         for seg in segments {
 184             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 185                 self.dumper.dump_ref(data);
 186             }
 187         }
 188     }
 189
 190     fn write_sub_paths<R>(&mut self, path: &'tcx hir::Path<'tcx, R>) {
 191         self.write_segments(path.segments)
 192     }
 193
 194     // As write_sub_paths, but does not process the last ident in the path (assuming it
 195     // will be processed elsewhere). See note on write_sub_paths about global.
 196     fn write_sub_paths_truncated<R>(&mut self, path: &'tcx hir::Path<'tcx, R>) {
 197         if let [segments @ .., _] = path.segments {
 198             self.write_segments(segments)
 199         }
 200     }
 201
 202     fn process_formals(&mut self, formals: &'tcx [hir::Param<'tcx>], qualname: &str) {
 203         for arg in formals {
 204             self.visit_pat(&arg.pat);
 205             let mut collector = PathCollector::new(self.tcx);
 206             collector.visit_pat(&arg.pat);
 207
 208             for (hir_id, ident, ..) in collector.collected_idents {
 209                 let typ = match self.save_ctxt.typeck_results().node_type_opt(hir_id) {
 210                     Some(s) => s.to_string(),
 211                     None => continue,
 212                 };
 213                 if !self.span.filter_generated(ident.span) {
 214                     let id = id_from_hir_id(hir_id);
 215                     let span = self.span_from_span(ident.span);
 216
 217                     self.dumper.dump_def(
 218                         &Access { public: false, reachable: false },
 219                         Def {
 220                             kind: DefKind::Local,
 221                             id,
 222                             span,
 223                             name: ident.to_string(),
 224                             qualname: format!("{}::{}", qualname, ident),
 225                             value: typ,
 226                             parent: None,
 227                             children: vec![],
 228                             decl_id: None,
 229                             docs: String::new(),
 230                             sig: None,
 231                             attributes: vec![],
 232                         },
 233                     );
 234                 }
 235             }
 236         }
 237     }
 238
 239     fn process_method(
 240         &mut self,
 241         sig: &'tcx hir::FnSig<'tcx>,
 242         body: Option<hir::BodyId>,
 243         owner_id: hir::OwnerId,
 244         ident: Ident,
 245         generics: &'tcx hir::Generics<'tcx>,
 246         span: Span,
 247     ) {
 248         debug!("process_method: {:?}:{}", owner_id, ident);
 249
 250         let map = self.tcx.hir();
 251         let hir_id: hir::HirId = owner_id.into();
 252         self.nest_typeck_results(owner_id.def_id, |v| {
 253             if let Some(mut method_data) = v.save_ctxt.get_method_data(owner_id, ident, span) {
 254                 if let Some(body) = body {
 255                     v.process_formals(map.body(body).params, &method_data.qualname);
 256                 }
 257                 v.process_generic_params(&generics, &method_data.qualname, hir_id);
 258
 259                 method_data.value =
 260                     fn_to_string(sig.decl, sig.header, Some(ident.name), generics, &[], None);
 261                 method_data.sig =
 262                     sig::method_signature(owner_id, ident, generics, sig, &v.save_ctxt);
 263
 264                 v.dumper.dump_def(&access_from!(v.save_ctxt, owner_id.def_id), method_data);
 265             }
 266
 267             // walk arg and return types
 268             for arg in sig.decl.inputs {
 269                 v.visit_ty(arg);
 270             }
 271
 272             if let hir::FnRetTy::Return(ref ret_ty) = sig.decl.output {
 273                 v.visit_ty(ret_ty)
 274             }
 275
 276             // walk the fn body
 277             if let Some(body) = body {
 278                 v.visit_expr(&map.body(body).value);
 279             }
 280         });
 281     }
 282
 283     fn process_struct_field_def(
 284         &mut self,
 285         field: &'tcx hir::FieldDef<'tcx>,
 286         parent_id: LocalDefId,
 287     ) {
 288         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 289         if let Some(field_data) = field_data {
 290             self.dumper.dump_def(&access_from!(self.save_ctxt, field.def_id), field_data);
 291         }
 292     }
 293
 294     // Dump generic params bindings, then visit_generics
 295     fn process_generic_params(
 296         &mut self,
 297         generics: &'tcx hir::Generics<'tcx>,
 298         prefix: &str,
 299         id: hir::HirId,
 300     ) {
 301         for param in generics.params {
 302             match param.kind {
 303                 hir::GenericParamKind::Lifetime { .. } => {}
 304                 hir::GenericParamKind::Type { .. } => {
 305                     let param_ss = param.name.ident().span;
 306                     let name = escape(self.span.snippet(param_ss));
 307                     // Append $id to name to make sure each one is unique.
 308                     let qualname = format!("{}::{}${}", prefix, name, id);
 309                     if !self.span.filter_generated(param_ss) {
 310                         let id = id_from_def_id(param.def_id.to_def_id());
 311                         let span = self.span_from_span(param_ss);
 312
 313                         self.dumper.dump_def(
 314                             &Access { public: false, reachable: false },
 315                             Def {
 316                                 kind: DefKind::Type,
 317                                 id,
 318                                 span,
 319                                 name,
 320                                 qualname,
 321                                 value: String::new(),
 322                                 parent: None,
 323                                 children: vec![],
 324                                 decl_id: None,
 325                                 docs: String::new(),
 326                                 sig: None,
 327                                 attributes: vec![],
 328                             },
 329                         );
 330                     }
 331                 }
 332                 hir::GenericParamKind::Const { .. } => {}
 333             }
 334         }
 335
 336         self.visit_generics(generics)
 337     }
 338
 339     fn process_fn(
 340         &mut self,
 341         item: &'tcx hir::Item<'tcx>,
 342         decl: &'tcx hir::FnDecl<'tcx>,
 343         _header: &'tcx hir::FnHeader,
 344         ty_params: &'tcx hir::Generics<'tcx>,
 345         body: hir::BodyId,
 346     ) {
 347         let map = self.tcx.hir();
 348         self.nest_typeck_results(item.owner_id.def_id, |v| {
 349             let body = map.body(body);
 350             if let Some(fn_data) = v.save_ctxt.get_item_data(item) {
 351                 down_cast_data!(fn_data, DefData, item.span);
 352                 v.process_formals(body.params, &fn_data.qualname);
 353                 v.process_generic_params(ty_params, &fn_data.qualname, item.hir_id());
 354
 355                 v.dumper.dump_def(&access_from!(v.save_ctxt, item.owner_id.def_id), fn_data);
 356             }
 357
 358             for arg in decl.inputs {
 359                 v.visit_ty(arg)
 360             }
 361
 362             if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
 363                 v.visit_ty(ret_ty)
 364             }
 365
 366             v.visit_expr(&body.value);
 367         });
 368     }
 369
 370     fn process_static_or_const_item(
 371         &mut self,
 372         item: &'tcx hir::Item<'tcx>,
 373         typ: &'tcx hir::Ty<'tcx>,
 374         expr: &'tcx hir::Expr<'tcx>,
 375     ) {
 376         self.nest_typeck_results(item.owner_id.def_id, |v| {
 377             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 378                 down_cast_data!(var_data, DefData, item.span);
 379                 v.dumper.dump_def(&access_from!(v.save_ctxt, item.owner_id.def_id), var_data);
 380             }
 381             v.visit_ty(&typ);
 382             v.visit_expr(expr);
 383         });
 384     }
 385
 386     fn process_assoc_const(
 387         &mut self,
 388         owner_id: hir::OwnerId,
 389         ident: Ident,
 390         typ: &'tcx hir::Ty<'tcx>,
 391         expr: Option<&'tcx hir::Expr<'tcx>>,
 392         parent_id: DefId,
 393         attrs: &'tcx [ast::Attribute],
 394     ) {
 395         let qualname = format!("::{}", self.tcx.def_path_str(owner_id.to_def_id()));
 396
 397         if !self.span.filter_generated(ident.span) {
 398             let sig = sig::assoc_const_signature(owner_id, ident.name, typ, expr, &self.save_ctxt);
 399             let span = self.span_from_span(ident.span);
 400
 401             self.dumper.dump_def(
 402                 &access_from!(self.save_ctxt, owner_id.def_id),
 403                 Def {
 404                     kind: DefKind::Const,
 405                     id: id_from_def_id(owner_id.to_def_id()),
 406                     span,
 407                     name: ident.name.to_string(),
 408                     qualname,
 409                     value: ty_to_string(&typ),
 410                     parent: Some(id_from_def_id(parent_id)),
 411                     children: vec![],
 412                     decl_id: None,
 413                     docs: self.save_ctxt.docs_for_attrs(attrs),
 414                     sig,
 415                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 416                 },
 417             );
 418         }
 419
 420         // walk type and init value
 421         self.nest_typeck_results(owner_id.def_id, |v| {
 422             v.visit_ty(typ);
 423             if let Some(expr) = expr {
 424                 v.visit_expr(expr);
 425             }
 426         });
 427     }
 428
 429     // FIXME tuple structs should generate tuple-specific data.
 430     fn process_struct(
 431         &mut self,
 432         item: &'tcx hir::Item<'tcx>,
 433         def: &'tcx hir::VariantData<'tcx>,
 434         ty_params: &'tcx hir::Generics<'tcx>,
 435     ) {
 436         debug!("process_struct {:?} {:?}", item, item.span);
 437         let name = item.ident.to_string();
 438         let qualname = format!("::{}", self.tcx.def_path_str(item.owner_id.to_def_id()));
 439
 440         let kind = match item.kind {
 441             hir::ItemKind::Struct(_, _) => DefKind::Struct,
 442             hir::ItemKind::Union(_, _) => DefKind::Union,
 443             _ => unreachable!(),
 444         };
 445
 446         let (value, fields) = match item.kind {
 447             hir::ItemKind::Struct(hir::VariantData::Struct(ref fields, ..), ..)
 448             | hir::ItemKind::Union(hir::VariantData::Struct(ref fields, ..), ..) => {
 449                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 450                 let fields_str = fields
 451                     .iter()
 452                     .filter_map(|f| {
 453                         if include_priv_fields {
 454                             return Some(f.ident.to_string());
 455                         }
 456                         if self.save_ctxt.tcx.visibility(f.def_id).is_public() {
 457                             Some(f.ident.to_string())
 458                         } else {
 459                             None
 460                         }
 461                     })
 462                     .collect::<Vec<_>>()
 463                     .join(", ");
 464                 let value = format!("{} {{ {} }}", name, fields_str);
 465                 (value, fields.iter().map(|f| id_from_def_id(f.def_id.to_def_id())).collect())
 466             }
 467             _ => (String::new(), vec![]),
 468         };
 469
 470         if !self.span.filter_generated(item.ident.span) {
 471             let span = self.span_from_span(item.ident.span);
 472             let attrs = self.tcx.hir().attrs(item.hir_id());
 473             self.dumper.dump_def(
 474                 &access_from!(self.save_ctxt, item.owner_id.def_id),
 475                 Def {
 476                     kind,
 477                     id: id_from_def_id(item.owner_id.to_def_id()),
 478                     span,
 479                     name,
 480                     qualname: qualname.clone(),
 481                     value,
 482                     parent: None,
 483                     children: fields,
 484                     decl_id: None,
 485                     docs: self.save_ctxt.docs_for_attrs(attrs),
 486                     sig: sig::item_signature(item, &self.save_ctxt),
 487                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 488                 },
 489             );
 490         }
 491
 492         self.nest_typeck_results(item.owner_id.def_id, |v| {
 493             for field in def.fields() {
 494                 v.process_struct_field_def(field, item.owner_id.def_id);
 495                 v.visit_ty(&field.ty);
 496             }
 497
 498             v.process_generic_params(ty_params, &qualname, item.hir_id());
 499         });
 500     }
 501
 502     fn process_enum(
 503         &mut self,
 504         item: &'tcx hir::Item<'tcx>,
 505         enum_definition: &'tcx hir::EnumDef<'tcx>,
 506         ty_params: &'tcx hir::Generics<'tcx>,
 507     ) {
 508         let enum_data = self.save_ctxt.get_item_data(item);
 509         let Some(enum_data) = enum_data else {
 510             return;
 511         };
 512         down_cast_data!(enum_data, DefData, item.span);
 513
 514         let access = access_from!(self.save_ctxt, item.owner_id.def_id);
 515
 516         for variant in enum_definition.variants {
 517             let name = variant.ident.name.to_string();
 518             let qualname = format!("{}::{}", enum_data.qualname, name);
 519             let name_span = variant.ident.span;
 520
 521             match variant.data {
 522                 hir::VariantData::Struct(ref fields, ..) => {
 523                     let fields_str =
 524                         fields.iter().map(|f| f.ident.to_string()).collect::<Vec<_>>().join(", ");
 525                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 526                     if !self.span.filter_generated(name_span) {
 527                         let span = self.span_from_span(name_span);
 528                         let id = id_from_def_id(variant.def_id.to_def_id());
 529                         let parent = Some(id_from_def_id(item.owner_id.to_def_id()));
 530                         let attrs = self.tcx.hir().attrs(variant.hir_id);
 531
 532                         self.dumper.dump_def(
 533                             &access,
 534                             Def {
 535                                 kind: DefKind::StructVariant,
 536                                 id,
 537                                 span,
 538                                 name,
 539                                 qualname,
 540                                 value,
 541                                 parent,
 542                                 children: vec![],
 543                                 decl_id: None,
 544                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 545                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 546                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 547                             },
 548                         );
 549                     }
 550                 }
 551                 ref v => {
 552                     let mut value = format!("{}::{}", enum_data.name, name);
 553                     if let hir::VariantData::Tuple(fields, _, _) = v {
 554                         value.push('(');
 555                         value.push_str(
 556                             &fields
 557                                 .iter()
 558                                 .map(|f| ty_to_string(&f.ty))
 559                                 .collect::<Vec<_>>()
 560                                 .join(", "),
 561                         );
 562                         value.push(')');
 563                     }
 564                     if !self.span.filter_generated(name_span) {
 565                         let span = self.span_from_span(name_span);
 566                         let id = id_from_def_id(variant.def_id.to_def_id());
 567                         let parent = Some(id_from_def_id(item.owner_id.to_def_id()));
 568                         let attrs = self.tcx.hir().attrs(variant.hir_id);
 569
 570                         self.dumper.dump_def(
 571                             &access,
 572                             Def {
 573                                 kind: DefKind::TupleVariant,
 574                                 id,
 575                                 span,
 576                                 name,
 577                                 qualname,
 578                                 value,
 579                                 parent,
 580                                 children: vec![],
 581                                 decl_id: None,
 582                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 583                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 584                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 585                             },
 586                         );
 587                     }
 588                 }
 589             }
 590
 591             for field in variant.data.fields() {
 592                 self.process_struct_field_def(field, variant.def_id);
 593                 self.visit_ty(field.ty);
 594             }
 595         }
 596         self.process_generic_params(ty_params, &enum_data.qualname, item.hir_id());
 597         self.dumper.dump_def(&access, enum_data);
 598     }
 599
 600     fn process_impl(&mut self, item: &'tcx hir::Item<'tcx>, impl_: &'tcx hir::Impl<'tcx>) {
 601         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 602             if !self.span.filter_generated(item.span) {
 603                 if let super::Data::RelationData(rel, imp) = impl_data {
 604                     self.dumper.dump_relation(rel);
 605                     self.dumper.dump_impl(imp);
 606                 } else {
 607                     span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 608                 }
 609             }
 610         }
 611
 612         let map = self.tcx.hir();
 613         self.nest_typeck_results(item.owner_id.def_id, |v| {
 614             v.visit_ty(&impl_.self_ty);
 615             if let Some(trait_ref) = &impl_.of_trait {
 616                 v.process_path(trait_ref.hir_ref_id, &hir::QPath::Resolved(None, &trait_ref.path));
 617             }
 618             v.process_generic_params(&impl_.generics, "", item.hir_id());
 619             for impl_item in impl_.items {
 620                 v.process_impl_item(map.impl_item(impl_item.id), item.owner_id.to_def_id());
 621             }
 622         });
 623     }
 624
 625     fn process_trait(
 626         &mut self,
 627         item: &'tcx hir::Item<'tcx>,
 628         generics: &'tcx hir::Generics<'tcx>,
 629         trait_refs: hir::GenericBounds<'tcx>,
 630         methods: &'tcx [hir::TraitItemRef],
 631     ) {
 632         let name = item.ident.to_string();
 633         let qualname = format!("::{}", self.tcx.def_path_str(item.owner_id.to_def_id()));
 634         let mut val = name.clone();
 635         if !generics.params.is_empty() {
 636             val.push_str(&generic_params_to_string(generics.params));
 637         }
 638         if !trait_refs.is_empty() {
 639             val.push_str(": ");
 640             val.push_str(&bounds_to_string(trait_refs));
 641         }
 642         if !self.span.filter_generated(item.ident.span) {
 643             let id = id_from_def_id(item.owner_id.to_def_id());
 644             let span = self.span_from_span(item.ident.span);
 645             let children =
 646                 methods.iter().map(|i| id_from_def_id(i.id.owner_id.to_def_id())).collect();
 647             let attrs = self.tcx.hir().attrs(item.hir_id());
 648             self.dumper.dump_def(
 649                 &access_from!(self.save_ctxt, item.owner_id.def_id),
 650                 Def {
 651                     kind: DefKind::Trait,
 652                     id,
 653                     span,
 654                     name,
 655                     qualname: qualname.clone(),
 656                     value: val,
 657                     parent: None,
 658                     children,
 659                     decl_id: None,
 660                     docs: self.save_ctxt.docs_for_attrs(attrs),
 661                     sig: sig::item_signature(item, &self.save_ctxt),
 662                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 663                 },
 664             );
 665         }
 666
 667         // supertraits
 668         for super_bound in trait_refs.iter() {
 669             let (def_id, sub_span) = match *super_bound {
 670                 hir::GenericBound::Trait(ref trait_ref, _) => (
 671                     self.lookup_def_id(trait_ref.trait_ref.hir_ref_id),
 672                     trait_ref.trait_ref.path.segments.last().unwrap().ident.span,
 673                 ),
 674                 hir::GenericBound::LangItemTrait(lang_item, span, _, _) => {
 675                     (Some(self.tcx.require_lang_item(lang_item, Some(span))), span)
 676                 }
 677                 hir::GenericBound::Outlives(..) => continue,
 678             };
 679
 680             if let Some(id) = def_id {
 681                 if !self.span.filter_generated(sub_span) {
 682                     let span = self.span_from_span(sub_span);
 683                     self.dumper.dump_ref(Ref {
 684                         kind: RefKind::Type,
 685                         span: span.clone(),
 686                         ref_id: id_from_def_id(id),
 687                     });
 688
 689                     self.dumper.dump_relation(Relation {
 690                         kind: RelationKind::SuperTrait,
 691                         span,
 692                         from: id_from_def_id(id),
 693                         to: id_from_def_id(item.owner_id.to_def_id()),
 694                     });
 695                 }
 696             }
 697         }
 698
 699         // walk generics and methods
 700         self.process_generic_params(generics, &qualname, item.hir_id());
 701         for method in methods {
 702             let map = self.tcx.hir();
 703             self.process_trait_item(map.trait_item(method.id), item.owner_id.to_def_id())
 704         }
 705     }
 706
 707     // `item` is the module in question, represented as an( item.
 708     fn process_mod(&mut self, item: &'tcx hir::Item<'tcx>) {
 709         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 710             down_cast_data!(mod_data, DefData, item.span);
 711             self.dumper.dump_def(&access_from!(self.save_ctxt, item.owner_id.def_id), mod_data);
 712         }
 713     }
 714
 715     fn dump_path_ref(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 716         let path_data = self.save_ctxt.get_path_data(id, path);
 717         if let Some(path_data) = path_data {
 718             self.dumper.dump_ref(path_data);
 719         }
 720     }
 721
 722     fn dump_path_segment_ref(&mut self, id: hir::HirId, segment: &hir::PathSegment<'tcx>) {
 723         let segment_data = self.save_ctxt.get_path_segment_data_with_id(segment, id);
 724         if let Some(segment_data) = segment_data {
 725             self.dumper.dump_ref(segment_data);
 726         }
 727     }
 728
 729     fn process_path(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 730         if self.span.filter_generated(path.span()) {
 731             return;
 732         }
 733         self.dump_path_ref(id, path);
 734
 735         // Type arguments
 736         let segments = match path {
 737             hir::QPath::Resolved(ty, path) => {
 738                 if let Some(ty) = ty {
 739                     self.visit_ty(ty);
 740                 }
 741                 path.segments
 742             }
 743             hir::QPath::TypeRelative(ty, segment) => {
 744                 self.visit_ty(ty);
 745                 std::slice::from_ref(*segment)
 746             }
 747             hir::QPath::LangItem(..) => return,
 748         };
 749         for seg in segments {
 750             if let Some(ref generic_args) = seg.args {
 751                 for arg in generic_args.args {
 752                     if let hir::GenericArg::Type(ref ty) = arg {
 753                         self.visit_ty(ty);
 754                     }
 755                 }
 756             }
 757         }
 758
 759         if let hir::QPath::Resolved(_, path) = path {
 760             self.write_sub_paths_truncated(path);
 761         }
 762     }
 763
 764     fn process_struct_lit(
 765         &mut self,
 766         ex: &'tcx hir::Expr<'tcx>,
 767         path: &'tcx hir::QPath<'tcx>,
 768         fields: &'tcx [hir::ExprField<'tcx>],
 769         variant: &'tcx ty::VariantDef,
 770         rest: Option<&'tcx hir::Expr<'tcx>>,
 771     ) {
 772         if let Some(_ex_res_data) = self.save_ctxt.get_expr_data(ex) {
 773             if let hir::QPath::Resolved(_, path) = path {
 774                 self.write_sub_paths_truncated(path);
 775             }
 776             // For MyEnum::MyVariant, get_expr_data gives us MyEnum, not MyVariant.
 777             // For recording the span's ref id, we want MyVariant.
 778             if !generated_code(ex.span) {
 779                 let sub_span = path.last_segment_span();
 780                 let span = self.save_ctxt.span_from_span(sub_span);
 781                 let reff =
 782                     Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(variant.def_id) };
 783                 self.dumper.dump_ref(reff);
 784             }
 785
 786             for field in fields {
 787                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 788                     self.dumper.dump_ref(field_data);
 789                 }
 790
 791                 self.visit_expr(&field.expr)
 792             }
 793         }
 794
 795         if let Some(base) = rest {
 796             self.visit_expr(&base);
 797         }
 798     }
 799
 800     fn process_method_call(
 801         &mut self,
 802         ex: &'tcx hir::Expr<'tcx>,
 803         seg: &'tcx hir::PathSegment<'tcx>,
 804         receiver: &'tcx hir::Expr<'tcx>,
 805         args: &'tcx [hir::Expr<'tcx>],
 806     ) {
 807         debug!("process_method_call {:?} {:?}", ex, ex.span);
 808         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 809             down_cast_data!(mcd, RefData, ex.span);
 810             if !generated_code(ex.span) {
 811                 self.dumper.dump_ref(mcd);
 812             }
 813         }
 814
 815         // Explicit types in the turbo-fish.
 816         if let Some(generic_args) = seg.args {
 817             for arg in generic_args.args {
 818                 if let hir::GenericArg::Type(ty) = arg {
 819                     self.visit_ty(&ty)
 820                 };
 821             }
 822         }
 823
 824         // walk receiver and args
 825         self.visit_expr(receiver);
 826         walk_list!(self, visit_expr, args);
 827     }
 828
 829     fn process_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
 830         match p.kind {
 831             hir::PatKind::Struct(ref _path, fields, _) => {
 832                 // FIXME do something with _path?
 833                 let adt = match self.save_ctxt.typeck_results().node_type_opt(p.hir_id) {
 834                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
 835                     _ => {
 836                         intravisit::walk_pat(self, p);
 837                         return;
 838                     }
 839                 };
 840                 let variant = adt.variant_of_res(self.save_ctxt.get_path_res(p.hir_id));
 841
 842                 for field in fields {
 843                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 844                         if !self.span.filter_generated(field.ident.span) {
 845                             let span = self.span_from_span(field.ident.span);
 846                             self.dumper.dump_ref(Ref {
 847                                 kind: RefKind::Variable,
 848                                 span,
 849                                 ref_id: id_from_def_id(variant.fields[index].did),
 850                             });
 851                         }
 852                     }
 853                     self.visit_pat(&field.pat);
 854                 }
 855             }
 856             _ => intravisit::walk_pat(self, p),
 857         }
 858     }
 859
 860     fn process_var_decl(&mut self, pat: &'tcx hir::Pat<'tcx>) {
 861         // The pattern could declare multiple new vars,
 862         // we must walk the pattern and collect them all.
 863         let mut collector = PathCollector::new(self.tcx);
 864         collector.visit_pat(&pat);
 865         self.visit_pat(&pat);
 866
 867         // Process collected paths.
 868         for (id, ident, _) in collector.collected_idents {
 869             let res = self.save_ctxt.get_path_res(id);
 870             match res {
 871                 Res::Local(hir_id) => {
 872                     let typ = self
 873                         .save_ctxt
 874                         .typeck_results()
 875                         .node_type_opt(hir_id)
 876                         .map(|t| t.to_string())
 877                         .unwrap_or_default();
 878
 879                     // Rust uses the id of the pattern for var lookups, so we'll use it too.
 880                     if !self.span.filter_generated(ident.span) {
 881                         let qualname = format!("{}${}", ident, hir_id);
 882                         let id = id_from_hir_id(hir_id);
 883                         let span = self.span_from_span(ident.span);
 884
 885                         self.dumper.dump_def(
 886                             &Access { public: false, reachable: false },
 887                             Def {
 888                                 kind: DefKind::Local,
 889                                 id,
 890                                 span,
 891                                 name: ident.to_string(),
 892                                 qualname,
 893                                 value: typ,
 894                                 parent: None,
 895                                 children: vec![],
 896                                 decl_id: None,
 897                                 docs: String::new(),
 898                                 sig: None,
 899                                 attributes: vec![],
 900                             },
 901                         );
 902                     }
 903                 }
 904                 Res::Def(
 905                     HirDefKind::Ctor(..)
 906                     | HirDefKind::Const
 907                     | HirDefKind::AssocConst
 908                     | HirDefKind::Struct
 909                     | HirDefKind::Variant
 910                     | HirDefKind::TyAlias
 911                     | HirDefKind::AssocTy,
 912                     _,
 913                 )
 914                 | Res::SelfTyParam { .. }
 915                 | Res::SelfTyAlias { .. } => {
 916                     self.dump_path_segment_ref(
 917                         id,
 918                         &hir::PathSegment::new(ident, hir::HirId::INVALID, Res::Err),
 919                     );
 920                 }
 921                 def => {
 922                     error!("unexpected definition kind when processing collected idents: {:?}", def)
 923                 }
 924             }
 925         }
 926
 927         for (id, ref path) in collector.collected_paths {
 928             self.process_path(id, path);
 929         }
 930     }
 931
 932     /// Extracts macro use and definition information from the AST node defined
 933     /// by the given NodeId, using the expansion information from the node's
 934     /// span.
 935     ///
 936     /// If the span is not macro-generated, do nothing, else use callee and
 937     /// callsite spans to record macro definition and use data, using the
 938     /// mac_uses and mac_defs sets to prevent multiples.
 939     fn process_macro_use(&mut self, _span: Span) {
 940         // FIXME if we're not dumping the defs (see below), there is no point
 941         // dumping refs either.
 942         // let source_span = span.source_callsite();
 943         // if !self.macro_calls.insert(source_span) {
 944         //     return;
 945         // }
 946
 947         // let data = match self.save_ctxt.get_macro_use_data(span) {
 948         //     None => return,
 949         //     Some(data) => data,
 950         // };
 951
 952         // self.dumper.macro_use(data);
 953
 954         // FIXME write the macro def
 955         // let mut hasher = DefaultHasher::new();
 956         // data.callee_span.hash(&mut hasher);
 957         // let hash = hasher.finish();
 958         // let qualname = format!("{}::{}", data.name, hash);
 959         // Don't write macro definition for imported macros
 960         // if !self.mac_defs.contains(&data.callee_span)
 961         //     && !data.imported {
 962         //     self.mac_defs.insert(data.callee_span);
 963         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
 964         //         self.dumper.macro_data(MacroData {
 965         //             span: sub_span,
 966         //             name: data.name.clone(),
 967         //             qualname: qualname.clone(),
 968         //             // FIXME where do macro docs come from?
 969         //             docs: String::new(),
 970         //         }.lower(self.tcx));
 971         //     }
 972         // }
 973     }
 974
 975     fn process_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>, trait_id: DefId) {
 976         self.process_macro_use(trait_item.span);
 977         match trait_item.kind {
 978             hir::TraitItemKind::Const(ref ty, body) => {
 979                 let body = body.map(|b| self.tcx.hir().body(b).value);
 980                 let attrs = self.tcx.hir().attrs(trait_item.hir_id());
 981                 self.process_assoc_const(
 982                     trait_item.owner_id,
 983                     trait_item.ident,
 984                     &ty,
 985                     body,
 986                     trait_id,
 987                     attrs,
 988                 );
 989             }
 990             hir::TraitItemKind::Fn(ref sig, ref trait_fn) => {
 991                 let body =
 992                     if let hir::TraitFn::Provided(body) = trait_fn { Some(*body) } else { None };
 993                 self.process_method(
 994                     sig,
 995                     body,
 996                     trait_item.owner_id,
 997                     trait_item.ident,
 998                     &trait_item.generics,
 999                     trait_item.span,
1000                 );
1001             }
1002             hir::TraitItemKind::Type(ref bounds, ref default_ty) => {
1003                 // FIXME do something with _bounds (for type refs)
1004                 let name = trait_item.ident.name.to_string();
1005                 let qualname =
1006                     format!("::{}", self.tcx.def_path_str(trait_item.owner_id.to_def_id()));
1007
1008                 if !self.span.filter_generated(trait_item.ident.span) {
1009                     let span = self.span_from_span(trait_item.ident.span);
1010                     let id = id_from_def_id(trait_item.owner_id.to_def_id());
1011                     let attrs = self.tcx.hir().attrs(trait_item.hir_id());
1012
1013                     self.dumper.dump_def(
1014                         &Access { public: true, reachable: true },
1015                         Def {
1016                             kind: DefKind::Type,
1017                             id,
1018                             span,
1019                             name,
1020                             qualname,
1021                             value: self.span.snippet(trait_item.span),
1022                             parent: Some(id_from_def_id(trait_id)),
1023                             children: vec![],
1024                             decl_id: None,
1025                             docs: self.save_ctxt.docs_for_attrs(attrs),
1026                             sig: sig::assoc_type_signature(
1027                                 trait_item.owner_id,
1028                                 trait_item.ident,
1029                                 Some(bounds),
1030                                 default_ty.as_deref(),
1031                                 &self.save_ctxt,
1032                             ),
1033                             attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
1034                         },
1035                     );
1036                 }
1037
1038                 if let Some(default_ty) = default_ty {
1039                     self.visit_ty(default_ty)
1040                 }
1041             }
1042         }
1043     }
1044
1045     fn process_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>, impl_id: DefId) {
1046         self.process_macro_use(impl_item.span);
1047         match impl_item.kind {
1048             hir::ImplItemKind::Const(ref ty, body) => {
1049                 let body = self.tcx.hir().body(body);
1050                 let attrs = self.tcx.hir().attrs(impl_item.hir_id());
1051                 self.process_assoc_const(
1052                     impl_item.owner_id,
1053                     impl_item.ident,
1054                     &ty,
1055                     Some(&body.value),
1056                     impl_id,
1057                     attrs,
1058                 );
1059             }
1060             hir::ImplItemKind::Fn(ref sig, body) => {
1061                 self.process_method(
1062                     sig,
1063                     Some(body),
1064                     impl_item.owner_id,
1065                     impl_item.ident,
1066                     &impl_item.generics,
1067                     impl_item.span,
1068                 );
1069             }
1070             hir::ImplItemKind::Type(ref ty) => {
1071                 // FIXME: uses of the assoc type should ideally point to this
1072                 // 'def' and the name here should be a ref to the def in the
1073                 // trait.
1074                 self.visit_ty(ty)
1075             }
1076         }
1077     }
1078
1079     pub(crate) fn process_crate(&mut self) {
1080         let qualname = format!("::{}", self.tcx.def_path_str(CRATE_DEF_ID.to_def_id()));
1081
1082         let sm = self.tcx.sess.source_map();
1083         let krate_mod = self.tcx.hir().root_module();
1084         let filename = sm.span_to_filename(krate_mod.spans.inner_span);
1085         let data_id = id_from_def_id(CRATE_DEF_ID.to_def_id());
1086         let children =
1087             krate_mod.item_ids.iter().map(|i| id_from_def_id(i.owner_id.to_def_id())).collect();
1088         let span = self.span_from_span(krate_mod.spans.inner_span);
1089         let attrs = self.tcx.hir().attrs(hir::CRATE_HIR_ID);
1090
1091         self.dumper.dump_def(
1092             &Access { public: true, reachable: true },
1093             Def {
1094                 kind: DefKind::Mod,
1095                 id: data_id,
1096                 name: String::new(),
1097                 qualname,
1098                 span,
1099                 value: filename.prefer_remapped().to_string(),
1100                 children,
1101                 parent: None,
1102                 decl_id: None,
1103                 docs: self.save_ctxt.docs_for_attrs(attrs),
1104                 sig: None,
1105                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1106             },
1107         );
1108         self.tcx.hir().walk_toplevel_module(self);
1109     }
1110
1111     fn process_bounds(&mut self, bounds: hir::GenericBounds<'tcx>) {
1112         for bound in bounds {
1113             if let hir::GenericBound::Trait(ref trait_ref, _) = *bound {
1114                 self.process_path(
1115                     trait_ref.trait_ref.hir_ref_id,
1116                     &hir::QPath::Resolved(None, &trait_ref.trait_ref.path),
1117                 )
1118             }
1119         }
1120     }
1121 }
1122
1123 impl<'tcx> Visitor<'tcx> for DumpVisitor<'tcx> {
1124     type NestedFilter = nested_filter::All;
1125
1126     fn nested_visit_map(&mut self) -> Self::Map {
1127         self.tcx.hir()
1128     }
1129
1130     fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
1131         self.process_macro_use(item.span);
1132         match item.kind {
1133             hir::ItemKind::Use(path, hir::UseKind::Single) => {
1134                 let sub_span = path.segments.last().unwrap().ident.span;
1135                 if !self.span.filter_generated(sub_span) {
1136                     let access = access_from!(self.save_ctxt, item.owner_id.def_id);
1137                     let ref_id = self.lookup_def_id(item.hir_id()).map(id_from_def_id);
1138                     let span = self.span_from_span(sub_span);
1139                     let parent = self.save_ctxt.tcx.local_parent(item.owner_id.def_id);
1140                     self.dumper.import(
1141                         &access,
1142                         Import {
1143                             kind: ImportKind::Use,
1144                             ref_id,
1145                             span,
1146                             alias_span: None,
1147                             name: item.ident.to_string(),
1148                             value: String::new(),
1149                             parent: Some(id_from_def_id(parent.to_def_id())),
1150                         },
1151                     );
1152                     self.write_sub_paths_truncated(&path);
1153                 }
1154             }
1155             hir::ItemKind::Use(path, hir::UseKind::Glob) => {
1156                 // Make a comma-separated list of names of imported modules.
1157                 let names = self.tcx.names_imported_by_glob_use(item.owner_id.def_id);
1158                 let names: Vec<_> = names.iter().map(|n| n.to_string()).collect();
1159
1160                 // Otherwise it's a span with wrong macro expansion info, which
1161                 // we don't want to track anyway, since it's probably macro-internal `use`
1162                 if let Some(sub_span) = self.span.sub_span_of_star(item.span) {
1163                     if !self.span.filter_generated(item.span) {
1164                         let access = access_from!(self.save_ctxt, item.owner_id.def_id);
1165                         let span = self.span_from_span(sub_span);
1166                         let parent = self.save_ctxt.tcx.local_parent(item.owner_id.def_id);
1167                         self.dumper.import(
1168                             &access,
1169                             Import {
1170                                 kind: ImportKind::GlobUse,
1171                                 ref_id: None,
1172                                 span,
1173                                 alias_span: None,
1174                                 name: "*".to_owned(),
1175                                 value: names.join(", "),
1176                                 parent: Some(id_from_def_id(parent.to_def_id())),
1177                             },
1178                         );
1179                         self.write_sub_paths(&path);
1180                     }
1181                 }
1182             }
1183             hir::ItemKind::ExternCrate(_) => {
1184                 let name_span = item.ident.span;
1185                 if !self.span.filter_generated(name_span) {
1186                     let span = self.span_from_span(name_span);
1187                     let parent = self.save_ctxt.tcx.local_parent(item.owner_id.def_id);
1188                     self.dumper.import(
1189                         &Access { public: false, reachable: false },
1190                         Import {
1191                             kind: ImportKind::ExternCrate,
1192                             ref_id: None,
1193                             span,
1194                             alias_span: None,
1195                             name: item.ident.to_string(),
1196                             value: String::new(),
1197                             parent: Some(id_from_def_id(parent.to_def_id())),
1198                         },
1199                     );
1200                 }
1201             }
1202             hir::ItemKind::Fn(ref sig, ref ty_params, body) => {
1203                 self.process_fn(item, sig.decl, &sig.header, ty_params, body)
1204             }
1205             hir::ItemKind::Static(ref typ, _, body) => {
1206                 let body = self.tcx.hir().body(body);
1207                 self.process_static_or_const_item(item, typ, &body.value)
1208             }
1209             hir::ItemKind::Const(ref typ, body) => {
1210                 let body = self.tcx.hir().body(body);
1211                 self.process_static_or_const_item(item, typ, &body.value)
1212             }
1213             hir::ItemKind::Struct(ref def, ref ty_params)
1214             | hir::ItemKind::Union(ref def, ref ty_params) => {
1215                 self.process_struct(item, def, ty_params)
1216             }
1217             hir::ItemKind::Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1218             hir::ItemKind::Impl(ref impl_) => self.process_impl(item, impl_),
1219             hir::ItemKind::Trait(_, _, ref generics, ref trait_refs, methods) => {
1220                 self.process_trait(item, generics, trait_refs, methods)
1221             }
1222             hir::ItemKind::Mod(ref m) => {
1223                 self.process_mod(item);
1224                 intravisit::walk_mod(self, m, item.hir_id());
1225             }
1226             hir::ItemKind::TyAlias(ty, ref generics) => {
1227                 let qualname = format!("::{}", self.tcx.def_path_str(item.owner_id.to_def_id()));
1228                 let value = ty_to_string(&ty);
1229                 if !self.span.filter_generated(item.ident.span) {
1230                     let span = self.span_from_span(item.ident.span);
1231                     let id = id_from_def_id(item.owner_id.to_def_id());
1232                     let attrs = self.tcx.hir().attrs(item.hir_id());
1233
1234                     self.dumper.dump_def(
1235                         &access_from!(self.save_ctxt, item.owner_id.def_id),
1236                         Def {
1237                             kind: DefKind::Type,
1238                             id,
1239                             span,
1240                             name: item.ident.to_string(),
1241                             qualname: qualname.clone(),
1242                             value,
1243                             parent: None,
1244                             children: vec![],
1245                             decl_id: None,
1246                             docs: self.save_ctxt.docs_for_attrs(attrs),
1247                             sig: sig::item_signature(item, &self.save_ctxt),
1248                             attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
1249                         },
1250                     );
1251                 }
1252
1253                 self.visit_ty(ty);
1254                 self.process_generic_params(generics, &qualname, item.hir_id());
1255             }
1256             _ => intravisit::walk_item(self, item),
1257         }
1258     }
1259
1260     fn visit_generics(&mut self, generics: &'tcx hir::Generics<'tcx>) {
1261         for param in generics.params {
1262             match param.kind {
1263                 hir::GenericParamKind::Lifetime { .. } => {}
1264                 hir::GenericParamKind::Type { ref default, .. } => {
1265                     if let Some(ref ty) = default {
1266                         self.visit_ty(ty);
1267                     }
1268                 }
1269                 hir::GenericParamKind::Const { ref ty, ref default } => {
1270                     self.visit_ty(ty);
1271                     if let Some(default) = default {
1272                         self.visit_anon_const(default);
1273                     }
1274                 }
1275             }
1276         }
1277         for pred in generics.predicates {
1278             if let hir::WherePredicate::BoundPredicate(ref wbp) = *pred {
1279                 self.process_bounds(wbp.bounds);
1280                 self.visit_ty(wbp.bounded_ty);
1281             }
1282         }
1283     }
1284
1285     fn visit_ty(&mut self, t: &'tcx hir::Ty<'tcx>) {
1286         self.process_macro_use(t.span);
1287         match t.kind {
1288             hir::TyKind::Path(ref path) => {
1289                 if generated_code(t.span) {
1290                     return;
1291                 }
1292
1293                 if let Some(id) = self.lookup_def_id(t.hir_id) {
1294                     let sub_span = path.last_segment_span();
1295                     let span = self.span_from_span(sub_span);
1296                     self.dumper.dump_ref(Ref {
1297                         kind: RefKind::Type,
1298                         span,
1299                         ref_id: id_from_def_id(id),
1300                     });
1301                 }
1302
1303                 if let hir::QPath::Resolved(_, path) = path {
1304                     self.write_sub_paths_truncated(path);
1305                 }
1306                 intravisit::walk_qpath(self, path, t.hir_id);
1307             }
1308             hir::TyKind::Array(ref ty, ref length) => {
1309                 self.visit_ty(ty);
1310                 let map = self.tcx.hir();
1311                 match length {
1312                     // FIXME(generic_arg_infer): We probably want to
1313                     // output the inferred type here? :shrug:
1314                     hir::ArrayLen::Infer(..) => {}
1315                     hir::ArrayLen::Body(anon_const) => self
1316                         .nest_typeck_results(anon_const.def_id, |v| {
1317                             v.visit_expr(&map.body(anon_const.body).value)
1318                         }),
1319                 }
1320             }
1321             hir::TyKind::OpaqueDef(item_id, _, _) => {
1322                 let item = self.tcx.hir().item(item_id);
1323                 self.nest_typeck_results(item_id.owner_id.def_id, |v| v.visit_item(item));
1324             }
1325             _ => intravisit::walk_ty(self, t),
1326         }
1327     }
1328
1329     fn visit_expr(&mut self, ex: &'tcx hir::Expr<'tcx>) {
1330         debug!("visit_expr {:?}", ex.kind);
1331         self.process_macro_use(ex.span);
1332         match ex.kind {
1333             hir::ExprKind::Struct(ref path, ref fields, ref rest) => {
1334                 let hir_expr = self.save_ctxt.tcx.hir().expect_expr(ex.hir_id);
1335                 let adt = match self.save_ctxt.typeck_results().expr_ty_opt(&hir_expr) {
1336                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1337                     _ => {
1338                         intravisit::walk_expr(self, ex);
1339                         return;
1340                     }
1341                 };
1342                 let res = self.save_ctxt.get_path_res(hir_expr.hir_id);
1343                 self.process_struct_lit(ex, path, fields, adt.variant_of_res(res), *rest)
1344             }
1345             hir::ExprKind::MethodCall(ref seg, receiver, args, _) => {
1346                 self.process_method_call(ex, seg, receiver, args)
1347             }
1348             hir::ExprKind::Field(ref sub_ex, _) => {
1349                 self.visit_expr(&sub_ex);
1350
1351                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1352                     down_cast_data!(field_data, RefData, ex.span);
1353                     if !generated_code(ex.span) {
1354                         self.dumper.dump_ref(field_data);
1355                     }
1356                 }
1357             }
1358             hir::ExprKind::Closure(&hir::Closure { ref fn_decl, body, def_id, .. }) => {
1359                 let id = format!("${}", ex.hir_id);
1360
1361                 // walk arg and return types
1362                 for ty in fn_decl.inputs {
1363                     self.visit_ty(ty);
1364                 }
1365
1366                 if let hir::FnRetTy::Return(ref ret_ty) = fn_decl.output {
1367                     self.visit_ty(ret_ty);
1368                 }
1369
1370                 // walk the body
1371                 let map = self.tcx.hir();
1372                 self.nest_typeck_results(def_id, |v| {
1373                     let body = map.body(body);
1374                     v.process_formals(body.params, &id);
1375                     v.visit_expr(&body.value)
1376                 });
1377             }
1378             hir::ExprKind::Repeat(ref expr, ref length) => {
1379                 self.visit_expr(expr);
1380                 let map = self.tcx.hir();
1381                 match length {
1382                     // FIXME(generic_arg_infer): We probably want to
1383                     // output the inferred type here? :shrug:
1384                     hir::ArrayLen::Infer(..) => {}
1385                     hir::ArrayLen::Body(anon_const) => self
1386                         .nest_typeck_results(anon_const.def_id, |v| {
1387                             v.visit_expr(&map.body(anon_const.body).value)
1388                         }),
1389                 }
1390             }
1391             // In particular, we take this branch for call and path expressions,
1392             // where we'll index the idents involved just by continuing to walk.
1393             _ => intravisit::walk_expr(self, ex),
1394         }
1395     }
1396
1397     fn visit_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
1398         self.process_macro_use(p.span);
1399         self.process_pat(p);
1400     }
1401
1402     fn visit_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) {
1403         self.process_var_decl(&arm.pat);
1404         if let Some(hir::Guard::If(expr)) = &arm.guard {
1405             self.visit_expr(expr);
1406         }
1407         self.visit_expr(&arm.body);
1408     }
1409
1410     fn visit_qpath(&mut self, path: &'tcx hir::QPath<'tcx>, id: hir::HirId, _: Span) {
1411         self.process_path(id, path);
1412     }
1413
1414     fn visit_stmt(&mut self, s: &'tcx hir::Stmt<'tcx>) {
1415         self.process_macro_use(s.span);
1416         intravisit::walk_stmt(self, s)
1417     }
1418
1419     fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
1420         self.process_macro_use(l.span);
1421         self.process_var_decl(&l.pat);
1422
1423         // Just walk the initializer, the else branch and type (don't want to walk the pattern again).
1424         walk_list!(self, visit_ty, &l.ty);
1425         walk_list!(self, visit_expr, &l.init);
1426         walk_list!(self, visit_block, l.els);
1427     }
1428
1429     fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem<'tcx>) {
1430         let access = access_from!(self.save_ctxt, item.owner_id.def_id);
1431
1432         match item.kind {
1433             hir::ForeignItemKind::Fn(decl, _, ref generics) => {
1434                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1435                     down_cast_data!(fn_data, DefData, item.span);
1436
1437                     self.process_generic_params(generics, &fn_data.qualname, item.hir_id());
1438                     self.dumper.dump_def(&access, fn_data);
1439                 }
1440
1441                 for ty in decl.inputs {
1442                     self.visit_ty(ty);
1443                 }
1444
1445                 if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
1446                     self.visit_ty(ret_ty);
1447                 }
1448             }
1449             hir::ForeignItemKind::Static(ref ty, _) => {
1450                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1451                     down_cast_data!(var_data, DefData, item.span);
1452                     self.dumper.dump_def(&access, var_data);
1453                 }
1454
1455                 self.visit_ty(ty);
1456             }
1457             hir::ForeignItemKind::Type => {
1458                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1459                     down_cast_data!(var_data, DefData, item.span);
1460                     self.dumper.dump_def(&access, var_data);
1461                 }
1462             }
1463         }
1464     }
1465 }