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 use tracing::{debug, error};
  48
  49 #[rustfmt::skip] // https://github.com/rust-lang/rustfmt/issues/5213
  50 macro_rules! down_cast_data {
  51     ($id:ident, $kind:ident, $sp:expr) => {
  52         let super::Data::$kind($id) = $id else {
  53             span_bug!($sp, "unexpected data kind: {:?}", $id);
  54         };
  55     };
  56 }
  57
  58 macro_rules! access_from {
  59     ($save_ctxt:expr, $id:expr) => {
  60         Access {
  61             public: $save_ctxt.tcx.visibility($id).is_public(),
  62             reachable: $save_ctxt.access_levels.is_reachable($id),
  63         }
  64     };
  65 }
  66
  67 pub struct DumpVisitor<'tcx> {
  68     pub save_ctxt: SaveContext<'tcx>,
  69     tcx: TyCtxt<'tcx>,
  70     dumper: Dumper,
  71
  72     span: SpanUtils<'tcx>,
  73     // Set of macro definition (callee) spans, and the set
  74     // of macro use (callsite) spans. We store these to ensure
  75     // we only write one macro def per unique macro definition, and
  76     // one macro use per unique callsite span.
  77     // mac_defs: FxHashSet<Span>,
  78     // macro_calls: FxHashSet<Span>,
  79 }
  80
  81 impl<'tcx> DumpVisitor<'tcx> {
  82     pub fn new(save_ctxt: SaveContext<'tcx>) -> DumpVisitor<'tcx> {
  83         let span_utils = SpanUtils::new(&save_ctxt.tcx.sess);
  84         let dumper = Dumper::new(save_ctxt.config.clone());
  85         DumpVisitor { tcx: save_ctxt.tcx, save_ctxt, dumper, span: span_utils }
  86     }
  87
  88     pub fn analysis(&self) -> &rls_data::Analysis {
  89         self.dumper.analysis()
  90     }
  91
  92     fn nest_typeck_results<F>(&mut self, item_def_id: LocalDefId, f: F)
  93     where
  94         F: FnOnce(&mut Self),
  95     {
  96         let typeck_results = if self.tcx.has_typeck_results(item_def_id) {
  97             Some(self.tcx.typeck(item_def_id))
  98         } else {
  99             None
 100         };
 101
 102         let old_maybe_typeck_results = self.save_ctxt.maybe_typeck_results;
 103         self.save_ctxt.maybe_typeck_results = typeck_results;
 104         f(self);
 105         self.save_ctxt.maybe_typeck_results = old_maybe_typeck_results;
 106     }
 107
 108     fn span_from_span(&self, span: Span) -> SpanData {
 109         self.save_ctxt.span_from_span(span)
 110     }
 111
 112     fn lookup_def_id(&self, ref_id: hir::HirId) -> Option<DefId> {
 113         self.save_ctxt.lookup_def_id(ref_id)
 114     }
 115
 116     pub fn dump_crate_info(&mut self, name: &str) {
 117         let source_file = self.tcx.sess.local_crate_source_file.as_ref();
 118         let crate_root = source_file.map(|source_file| {
 119             let source_file = Path::new(source_file);
 120             match source_file.file_name() {
 121                 Some(_) => source_file.parent().unwrap().display(),
 122                 None => source_file.display(),
 123             }
 124             .to_string()
 125         });
 126
 127         let data = CratePreludeData {
 128             crate_id: GlobalCrateId {
 129                 name: name.into(),
 130                 disambiguator: (self.tcx.sess.local_stable_crate_id().to_u64(), 0),
 131             },
 132             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 133             external_crates: self.save_ctxt.get_external_crates(),
 134             span: self.span_from_span(self.tcx.def_span(CRATE_DEF_ID)),
 135         };
 136
 137         self.dumper.crate_prelude(data);
 138     }
 139
 140     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
 141         // Apply possible `remap-path-prefix` remapping to the input source file
 142         // (and don't include remapping args anymore)
 143         let (program, arguments) = {
 144             let remap_arg_indices = {
 145                 let mut indices = FxHashSet::default();
 146                 // Args are guaranteed to be valid UTF-8 (checked early)
 147                 for (i, e) in env::args().enumerate() {
 148                     if e.starts_with("--remap-path-prefix=") {
 149                         indices.insert(i);
 150                     } else if e == "--remap-path-prefix" {
 151                         indices.insert(i);
 152                         indices.insert(i + 1);
 153                     }
 154                 }
 155                 indices
 156             };
 157
 158             let mut args = env::args()
 159                 .enumerate()
 160                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 161                 .map(|(_, arg)| match input {
 162                     Input::File(ref path) if path == Path::new(&arg) => {
 163                         let mapped = &self.tcx.sess.local_crate_source_file;
 164                         mapped.as_ref().unwrap().to_string_lossy().into()
 165                     }
 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(&mut self, path: &'tcx hir::Path<'tcx>) {
 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(&mut self, path: &'tcx hir::Path<'tcx>) {
 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, &self.save_ctxt);
 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         def_id: LocalDefId,
 244         ident: Ident,
 245         generics: &'tcx hir::Generics<'tcx>,
 246         span: Span,
 247     ) {
 248         debug!("process_method: {:?}:{}", def_id, ident);
 249
 250         let map = self.tcx.hir();
 251         let hir_id = map.local_def_id_to_hir_id(def_id);
 252         self.nest_typeck_results(def_id, |v| {
 253             if let Some(mut method_data) = v.save_ctxt.get_method_data(hir_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 = sig::method_signature(hir_id, ident, generics, sig, &v.save_ctxt);
 262
 263                 v.dumper.dump_def(&access_from!(v.save_ctxt, def_id), method_data);
 264             }
 265
 266             // walk arg and return types
 267             for arg in sig.decl.inputs {
 268                 v.visit_ty(arg);
 269             }
 270
 271             if let hir::FnRetTy::Return(ref ret_ty) = sig.decl.output {
 272                 v.visit_ty(ret_ty)
 273             }
 274
 275             // walk the fn body
 276             if let Some(body) = body {
 277                 v.visit_expr(&map.body(body).value);
 278             }
 279         });
 280     }
 281
 282     fn process_struct_field_def(
 283         &mut self,
 284         field: &'tcx hir::FieldDef<'tcx>,
 285         parent_id: hir::HirId,
 286     ) {
 287         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 288         if let Some(field_data) = field_data {
 289             self.dumper.dump_def(
 290                 &access_from!(self.save_ctxt, self.tcx.hir().local_def_id(field.hir_id)),
 291                 field_data,
 292             );
 293         }
 294     }
 295
 296     // Dump generic params bindings, then visit_generics
 297     fn process_generic_params(
 298         &mut self,
 299         generics: &'tcx hir::Generics<'tcx>,
 300         prefix: &str,
 301         id: hir::HirId,
 302     ) {
 303         for param in generics.params {
 304             match param.kind {
 305                 hir::GenericParamKind::Lifetime { .. } => {}
 306                 hir::GenericParamKind::Type { .. } => {
 307                     let param_ss = param.name.ident().span;
 308                     let name = escape(self.span.snippet(param_ss));
 309                     // Append $id to name to make sure each one is unique.
 310                     let qualname = format!("{}::{}${}", prefix, name, id);
 311                     if !self.span.filter_generated(param_ss) {
 312                         let id = id_from_hir_id(param.hir_id, &self.save_ctxt);
 313                         let span = self.span_from_span(param_ss);
 314
 315                         self.dumper.dump_def(
 316                             &Access { public: false, reachable: false },
 317                             Def {
 318                                 kind: DefKind::Type,
 319                                 id,
 320                                 span,
 321                                 name,
 322                                 qualname,
 323                                 value: String::new(),
 324                                 parent: None,
 325                                 children: vec![],
 326                                 decl_id: None,
 327                                 docs: String::new(),
 328                                 sig: None,
 329                                 attributes: vec![],
 330                             },
 331                         );
 332                     }
 333                 }
 334                 hir::GenericParamKind::Const { .. } => {}
 335             }
 336         }
 337
 338         self.visit_generics(generics)
 339     }
 340
 341     fn process_fn(
 342         &mut self,
 343         item: &'tcx hir::Item<'tcx>,
 344         decl: &'tcx hir::FnDecl<'tcx>,
 345         _header: &'tcx hir::FnHeader,
 346         ty_params: &'tcx hir::Generics<'tcx>,
 347         body: hir::BodyId,
 348     ) {
 349         let map = self.tcx.hir();
 350         self.nest_typeck_results(item.def_id, |v| {
 351             let body = map.body(body);
 352             if let Some(fn_data) = v.save_ctxt.get_item_data(item) {
 353                 down_cast_data!(fn_data, DefData, item.span);
 354                 v.process_formals(body.params, &fn_data.qualname);
 355                 v.process_generic_params(ty_params, &fn_data.qualname, item.hir_id());
 356
 357                 v.dumper.dump_def(&access_from!(v.save_ctxt, item.def_id), fn_data);
 358             }
 359
 360             for arg in decl.inputs {
 361                 v.visit_ty(arg)
 362             }
 363
 364             if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
 365                 v.visit_ty(ret_ty)
 366             }
 367
 368             v.visit_expr(&body.value);
 369         });
 370     }
 371
 372     fn process_static_or_const_item(
 373         &mut self,
 374         item: &'tcx hir::Item<'tcx>,
 375         typ: &'tcx hir::Ty<'tcx>,
 376         expr: &'tcx hir::Expr<'tcx>,
 377     ) {
 378         self.nest_typeck_results(item.def_id, |v| {
 379             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 380                 down_cast_data!(var_data, DefData, item.span);
 381                 v.dumper.dump_def(&access_from!(v.save_ctxt, item.def_id), var_data);
 382             }
 383             v.visit_ty(&typ);
 384             v.visit_expr(expr);
 385         });
 386     }
 387
 388     fn process_assoc_const(
 389         &mut self,
 390         def_id: LocalDefId,
 391         ident: Ident,
 392         typ: &'tcx hir::Ty<'tcx>,
 393         expr: Option<&'tcx hir::Expr<'tcx>>,
 394         parent_id: DefId,
 395         attrs: &'tcx [ast::Attribute],
 396     ) {
 397         let qualname = format!("::{}", self.tcx.def_path_str(def_id.to_def_id()));
 398
 399         if !self.span.filter_generated(ident.span) {
 400             let hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id);
 401             let sig = sig::assoc_const_signature(hir_id, ident.name, typ, expr, &self.save_ctxt);
 402             let span = self.span_from_span(ident.span);
 403
 404             self.dumper.dump_def(
 405                 &access_from!(self.save_ctxt, def_id),
 406                 Def {
 407                     kind: DefKind::Const,
 408                     id: id_from_hir_id(hir_id, &self.save_ctxt),
 409                     span,
 410                     name: ident.name.to_string(),
 411                     qualname,
 412                     value: ty_to_string(&typ),
 413                     parent: Some(id_from_def_id(parent_id)),
 414                     children: vec![],
 415                     decl_id: None,
 416                     docs: self.save_ctxt.docs_for_attrs(attrs),
 417                     sig,
 418                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 419                 },
 420             );
 421         }
 422
 423         // walk type and init value
 424         self.nest_typeck_results(def_id, |v| {
 425             v.visit_ty(typ);
 426             if let Some(expr) = expr {
 427                 v.visit_expr(expr);
 428             }
 429         });
 430     }
 431
 432     // FIXME tuple structs should generate tuple-specific data.
 433     fn process_struct(
 434         &mut self,
 435         item: &'tcx hir::Item<'tcx>,
 436         def: &'tcx hir::VariantData<'tcx>,
 437         ty_params: &'tcx hir::Generics<'tcx>,
 438     ) {
 439         debug!("process_struct {:?} {:?}", item, item.span);
 440         let name = item.ident.to_string();
 441         let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
 442
 443         let kind = match item.kind {
 444             hir::ItemKind::Struct(_, _) => DefKind::Struct,
 445             hir::ItemKind::Union(_, _) => DefKind::Union,
 446             _ => unreachable!(),
 447         };
 448
 449         let (value, fields) = match item.kind {
 450             hir::ItemKind::Struct(hir::VariantData::Struct(ref fields, ..), ..)
 451             | hir::ItemKind::Union(hir::VariantData::Struct(ref fields, ..), ..) => {
 452                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 453                 let fields_str = fields
 454                     .iter()
 455                     .filter_map(|f| {
 456                         if include_priv_fields {
 457                             return Some(f.ident.to_string());
 458                         }
 459                         let def_id = self.save_ctxt.tcx.hir().local_def_id(f.hir_id);
 460                         if self.save_ctxt.tcx.visibility(def_id).is_public() {
 461                             Some(f.ident.to_string())
 462                         } else {
 463                             None
 464                         }
 465                     })
 466                     .collect::<Vec<_>>()
 467                     .join(", ");
 468                 let value = format!("{} {{ {} }}", name, fields_str);
 469                 (value, fields.iter().map(|f| id_from_hir_id(f.hir_id, &self.save_ctxt)).collect())
 470             }
 471             _ => (String::new(), vec![]),
 472         };
 473
 474         if !self.span.filter_generated(item.ident.span) {
 475             let span = self.span_from_span(item.ident.span);
 476             let attrs = self.tcx.hir().attrs(item.hir_id());
 477             self.dumper.dump_def(
 478                 &access_from!(self.save_ctxt, item.def_id),
 479                 Def {
 480                     kind,
 481                     id: id_from_def_id(item.def_id.to_def_id()),
 482                     span,
 483                     name,
 484                     qualname: qualname.clone(),
 485                     value,
 486                     parent: None,
 487                     children: fields,
 488                     decl_id: None,
 489                     docs: self.save_ctxt.docs_for_attrs(attrs),
 490                     sig: sig::item_signature(item, &self.save_ctxt),
 491                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 492                 },
 493             );
 494         }
 495
 496         self.nest_typeck_results(item.def_id, |v| {
 497             for field in def.fields() {
 498                 v.process_struct_field_def(field, item.hir_id());
 499                 v.visit_ty(&field.ty);
 500             }
 501
 502             v.process_generic_params(ty_params, &qualname, item.hir_id());
 503         });
 504     }
 505
 506     fn process_enum(
 507         &mut self,
 508         item: &'tcx hir::Item<'tcx>,
 509         enum_definition: &'tcx hir::EnumDef<'tcx>,
 510         ty_params: &'tcx hir::Generics<'tcx>,
 511     ) {
 512         let enum_data = self.save_ctxt.get_item_data(item);
 513         let Some(enum_data) = enum_data else {
 514             return;
 515         };
 516         down_cast_data!(enum_data, DefData, item.span);
 517
 518         let access = access_from!(self.save_ctxt, item.def_id);
 519
 520         for variant in enum_definition.variants {
 521             let name = variant.ident.name.to_string();
 522             let qualname = format!("{}::{}", enum_data.qualname, name);
 523             let name_span = variant.ident.span;
 524
 525             match variant.data {
 526                 hir::VariantData::Struct(ref fields, ..) => {
 527                     let fields_str =
 528                         fields.iter().map(|f| f.ident.to_string()).collect::<Vec<_>>().join(", ");
 529                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 530                     if !self.span.filter_generated(name_span) {
 531                         let span = self.span_from_span(name_span);
 532                         let id = id_from_hir_id(variant.id, &self.save_ctxt);
 533                         let parent = Some(id_from_def_id(item.def_id.to_def_id()));
 534                         let attrs = self.tcx.hir().attrs(variant.id);
 535
 536                         self.dumper.dump_def(
 537                             &access,
 538                             Def {
 539                                 kind: DefKind::StructVariant,
 540                                 id,
 541                                 span,
 542                                 name,
 543                                 qualname,
 544                                 value,
 545                                 parent,
 546                                 children: vec![],
 547                                 decl_id: None,
 548                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 549                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 550                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 551                             },
 552                         );
 553                     }
 554                 }
 555                 ref v => {
 556                     let mut value = format!("{}::{}", enum_data.name, name);
 557                     if let hir::VariantData::Tuple(fields, _) = v {
 558                         value.push('(');
 559                         value.push_str(
 560                             &fields
 561                                 .iter()
 562                                 .map(|f| ty_to_string(&f.ty))
 563                                 .collect::<Vec<_>>()
 564                                 .join(", "),
 565                         );
 566                         value.push(')');
 567                     }
 568                     if !self.span.filter_generated(name_span) {
 569                         let span = self.span_from_span(name_span);
 570                         let id = id_from_hir_id(variant.id, &self.save_ctxt);
 571                         let parent = Some(id_from_def_id(item.def_id.to_def_id()));
 572                         let attrs = self.tcx.hir().attrs(variant.id);
 573
 574                         self.dumper.dump_def(
 575                             &access,
 576                             Def {
 577                                 kind: DefKind::TupleVariant,
 578                                 id,
 579                                 span,
 580                                 name,
 581                                 qualname,
 582                                 value,
 583                                 parent,
 584                                 children: vec![],
 585                                 decl_id: None,
 586                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 587                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 588                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 589                             },
 590                         );
 591                     }
 592                 }
 593             }
 594
 595             for field in variant.data.fields() {
 596                 self.process_struct_field_def(field, variant.id);
 597                 self.visit_ty(field.ty);
 598             }
 599         }
 600         self.process_generic_params(ty_params, &enum_data.qualname, item.hir_id());
 601         self.dumper.dump_def(&access, enum_data);
 602     }
 603
 604     fn process_impl(&mut self, item: &'tcx hir::Item<'tcx>, impl_: &'tcx hir::Impl<'tcx>) {
 605         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 606             if !self.span.filter_generated(item.span) {
 607                 if let super::Data::RelationData(rel, imp) = impl_data {
 608                     self.dumper.dump_relation(rel);
 609                     self.dumper.dump_impl(imp);
 610                 } else {
 611                     span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 612                 }
 613             }
 614         }
 615
 616         let map = self.tcx.hir();
 617         self.nest_typeck_results(item.def_id, |v| {
 618             v.visit_ty(&impl_.self_ty);
 619             if let Some(trait_ref) = &impl_.of_trait {
 620                 v.process_path(trait_ref.hir_ref_id, &hir::QPath::Resolved(None, &trait_ref.path));
 621             }
 622             v.process_generic_params(&impl_.generics, "", item.hir_id());
 623             for impl_item in impl_.items {
 624                 v.process_impl_item(map.impl_item(impl_item.id), item.def_id.to_def_id());
 625             }
 626         });
 627     }
 628
 629     fn process_trait(
 630         &mut self,
 631         item: &'tcx hir::Item<'tcx>,
 632         generics: &'tcx hir::Generics<'tcx>,
 633         trait_refs: hir::GenericBounds<'tcx>,
 634         methods: &'tcx [hir::TraitItemRef],
 635     ) {
 636         let name = item.ident.to_string();
 637         let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
 638         let mut val = name.clone();
 639         if !generics.params.is_empty() {
 640             val.push_str(&generic_params_to_string(generics.params));
 641         }
 642         if !trait_refs.is_empty() {
 643             val.push_str(": ");
 644             val.push_str(&bounds_to_string(trait_refs));
 645         }
 646         if !self.span.filter_generated(item.ident.span) {
 647             let id = id_from_def_id(item.def_id.to_def_id());
 648             let span = self.span_from_span(item.ident.span);
 649             let children =
 650                 methods.iter().map(|i| id_from_def_id(i.id.def_id.to_def_id())).collect();
 651             let attrs = self.tcx.hir().attrs(item.hir_id());
 652             self.dumper.dump_def(
 653                 &access_from!(self.save_ctxt, item.def_id),
 654                 Def {
 655                     kind: DefKind::Trait,
 656                     id,
 657                     span,
 658                     name,
 659                     qualname: qualname.clone(),
 660                     value: val,
 661                     parent: None,
 662                     children,
 663                     decl_id: None,
 664                     docs: self.save_ctxt.docs_for_attrs(attrs),
 665                     sig: sig::item_signature(item, &self.save_ctxt),
 666                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 667                 },
 668             );
 669         }
 670
 671         // supertraits
 672         for super_bound in trait_refs.iter() {
 673             let (def_id, sub_span) = match *super_bound {
 674                 hir::GenericBound::Trait(ref trait_ref, _) => (
 675                     self.lookup_def_id(trait_ref.trait_ref.hir_ref_id),
 676                     trait_ref.trait_ref.path.segments.last().unwrap().ident.span,
 677                 ),
 678                 hir::GenericBound::LangItemTrait(lang_item, span, _, _) => {
 679                     (Some(self.tcx.require_lang_item(lang_item, Some(span))), span)
 680                 }
 681                 hir::GenericBound::Outlives(..) => continue,
 682             };
 683
 684             if let Some(id) = def_id {
 685                 if !self.span.filter_generated(sub_span) {
 686                     let span = self.span_from_span(sub_span);
 687                     self.dumper.dump_ref(Ref {
 688                         kind: RefKind::Type,
 689                         span: span.clone(),
 690                         ref_id: id_from_def_id(id),
 691                     });
 692
 693                     self.dumper.dump_relation(Relation {
 694                         kind: RelationKind::SuperTrait,
 695                         span,
 696                         from: id_from_def_id(id),
 697                         to: id_from_def_id(item.def_id.to_def_id()),
 698                     });
 699                 }
 700             }
 701         }
 702
 703         // walk generics and methods
 704         self.process_generic_params(generics, &qualname, item.hir_id());
 705         for method in methods {
 706             let map = self.tcx.hir();
 707             self.process_trait_item(map.trait_item(method.id), item.def_id.to_def_id())
 708         }
 709     }
 710
 711     // `item` is the module in question, represented as an( item.
 712     fn process_mod(&mut self, item: &'tcx hir::Item<'tcx>) {
 713         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 714             down_cast_data!(mod_data, DefData, item.span);
 715             self.dumper.dump_def(&access_from!(self.save_ctxt, item.def_id), mod_data);
 716         }
 717     }
 718
 719     fn dump_path_ref(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 720         let path_data = self.save_ctxt.get_path_data(id, path);
 721         if let Some(path_data) = path_data {
 722             self.dumper.dump_ref(path_data);
 723         }
 724     }
 725
 726     fn dump_path_segment_ref(&mut self, id: hir::HirId, segment: &hir::PathSegment<'tcx>) {
 727         let segment_data = self.save_ctxt.get_path_segment_data_with_id(segment, id);
 728         if let Some(segment_data) = segment_data {
 729             self.dumper.dump_ref(segment_data);
 730         }
 731     }
 732
 733     fn process_path(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 734         if self.span.filter_generated(path.span()) {
 735             return;
 736         }
 737         self.dump_path_ref(id, path);
 738
 739         // Type arguments
 740         let segments = match path {
 741             hir::QPath::Resolved(ty, path) => {
 742                 if let Some(ty) = ty {
 743                     self.visit_ty(ty);
 744                 }
 745                 path.segments
 746             }
 747             hir::QPath::TypeRelative(ty, segment) => {
 748                 self.visit_ty(ty);
 749                 std::slice::from_ref(*segment)
 750             }
 751             hir::QPath::LangItem(..) => return,
 752         };
 753         for seg in segments {
 754             if let Some(ref generic_args) = seg.args {
 755                 for arg in generic_args.args {
 756                     if let hir::GenericArg::Type(ref ty) = arg {
 757                         self.visit_ty(ty);
 758                     }
 759                 }
 760             }
 761         }
 762
 763         if let hir::QPath::Resolved(_, path) = path {
 764             self.write_sub_paths_truncated(path);
 765         }
 766     }
 767
 768     fn process_struct_lit(
 769         &mut self,
 770         ex: &'tcx hir::Expr<'tcx>,
 771         path: &'tcx hir::QPath<'tcx>,
 772         fields: &'tcx [hir::ExprField<'tcx>],
 773         variant: &'tcx ty::VariantDef,
 774         rest: Option<&'tcx hir::Expr<'tcx>>,
 775     ) {
 776         if let Some(_ex_res_data) = self.save_ctxt.get_expr_data(ex) {
 777             if let hir::QPath::Resolved(_, path) = path {
 778                 self.write_sub_paths_truncated(path);
 779             }
 780             // For MyEnum::MyVariant, get_expr_data gives us MyEnum, not MyVariant.
 781             // For recording the span's ref id, we want MyVariant.
 782             if !generated_code(ex.span) {
 783                 let sub_span = path.last_segment_span();
 784                 let span = self.save_ctxt.span_from_span(sub_span);
 785                 let reff =
 786                     Ref { kind: RefKind::Type, span, ref_id: id_from_def_id(variant.def_id) };
 787                 self.dumper.dump_ref(reff);
 788             }
 789
 790             for field in fields {
 791                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 792                     self.dumper.dump_ref(field_data);
 793                 }
 794
 795                 self.visit_expr(&field.expr)
 796             }
 797         }
 798
 799         if let Some(base) = rest {
 800             self.visit_expr(&base);
 801         }
 802     }
 803
 804     fn process_method_call(
 805         &mut self,
 806         ex: &'tcx hir::Expr<'tcx>,
 807         seg: &'tcx hir::PathSegment<'tcx>,
 808         args: &'tcx [hir::Expr<'tcx>],
 809     ) {
 810         debug!("process_method_call {:?} {:?}", ex, ex.span);
 811         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 812             down_cast_data!(mcd, RefData, ex.span);
 813             if !generated_code(ex.span) {
 814                 self.dumper.dump_ref(mcd);
 815             }
 816         }
 817
 818         // Explicit types in the turbo-fish.
 819         if let Some(generic_args) = seg.args {
 820             for arg in generic_args.args {
 821                 if let hir::GenericArg::Type(ty) = arg {
 822                     self.visit_ty(&ty)
 823                 };
 824             }
 825         }
 826
 827         // walk receiver and args
 828         walk_list!(self, visit_expr, args);
 829     }
 830
 831     fn process_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
 832         match p.kind {
 833             hir::PatKind::Struct(ref _path, fields, _) => {
 834                 // FIXME do something with _path?
 835                 let adt = match self.save_ctxt.typeck_results().node_type_opt(p.hir_id) {
 836                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
 837                     _ => {
 838                         intravisit::walk_pat(self, p);
 839                         return;
 840                     }
 841                 };
 842                 let variant = adt.variant_of_res(self.save_ctxt.get_path_res(p.hir_id));
 843
 844                 for field in fields {
 845                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 846                         if !self.span.filter_generated(field.ident.span) {
 847                             let span = self.span_from_span(field.ident.span);
 848                             self.dumper.dump_ref(Ref {
 849                                 kind: RefKind::Variable,
 850                                 span,
 851                                 ref_id: id_from_def_id(variant.fields[index].did),
 852                             });
 853                         }
 854                     }
 855                     self.visit_pat(&field.pat);
 856                 }
 857             }
 858             _ => intravisit::walk_pat(self, p),
 859         }
 860     }
 861
 862     fn process_var_decl(&mut self, pat: &'tcx hir::Pat<'tcx>) {
 863         // The pattern could declare multiple new vars,
 864         // we must walk the pattern and collect them all.
 865         let mut collector = PathCollector::new(self.tcx);
 866         collector.visit_pat(&pat);
 867         self.visit_pat(&pat);
 868
 869         // Process collected paths.
 870         for (id, ident, _) in collector.collected_idents {
 871             let res = self.save_ctxt.get_path_res(id);
 872             match res {
 873                 Res::Local(hir_id) => {
 874                     let typ = self
 875                         .save_ctxt
 876                         .typeck_results()
 877                         .node_type_opt(hir_id)
 878                         .map(|t| t.to_string())
 879                         .unwrap_or_default();
 880
 881                     // Rust uses the id of the pattern for var lookups, so we'll use it too.
 882                     if !self.span.filter_generated(ident.span) {
 883                         let qualname = format!("{}${}", ident, hir_id);
 884                         let id = id_from_hir_id(hir_id, &self.save_ctxt);
 885                         let span = self.span_from_span(ident.span);
 886
 887                         self.dumper.dump_def(
 888                             &Access { public: false, reachable: false },
 889                             Def {
 890                                 kind: DefKind::Local,
 891                                 id,
 892                                 span,
 893                                 name: ident.to_string(),
 894                                 qualname,
 895                                 value: typ,
 896                                 parent: None,
 897                                 children: vec![],
 898                                 decl_id: None,
 899                                 docs: String::new(),
 900                                 sig: None,
 901                                 attributes: vec![],
 902                             },
 903                         );
 904                     }
 905                 }
 906                 Res::Def(
 907                     HirDefKind::Ctor(..)
 908                     | HirDefKind::Const
 909                     | HirDefKind::AssocConst
 910                     | HirDefKind::Struct
 911                     | HirDefKind::Variant
 912                     | HirDefKind::TyAlias
 913                     | HirDefKind::AssocTy,
 914                     _,
 915                 )
 916                 | Res::SelfTy { .. } => {
 917                     self.dump_path_segment_ref(id, &hir::PathSegment::from_ident(ident));
 918                 }
 919                 def => {
 920                     error!("unexpected definition kind when processing collected idents: {:?}", def)
 921                 }
 922             }
 923         }
 924
 925         for (id, ref path) in collector.collected_paths {
 926             self.process_path(id, path);
 927         }
 928     }
 929
 930     /// Extracts macro use and definition information from the AST node defined
 931     /// by the given NodeId, using the expansion information from the node's
 932     /// span.
 933     ///
 934     /// If the span is not macro-generated, do nothing, else use callee and
 935     /// callsite spans to record macro definition and use data, using the
 936     /// mac_uses and mac_defs sets to prevent multiples.
 937     fn process_macro_use(&mut self, _span: Span) {
 938         // FIXME if we're not dumping the defs (see below), there is no point
 939         // dumping refs either.
 940         // let source_span = span.source_callsite();
 941         // if !self.macro_calls.insert(source_span) {
 942         //     return;
 943         // }
 944
 945         // let data = match self.save_ctxt.get_macro_use_data(span) {
 946         //     None => return,
 947         //     Some(data) => data,
 948         // };
 949
 950         // self.dumper.macro_use(data);
 951
 952         // FIXME write the macro def
 953         // let mut hasher = DefaultHasher::new();
 954         // data.callee_span.hash(&mut hasher);
 955         // let hash = hasher.finish();
 956         // let qualname = format!("{}::{}", data.name, hash);
 957         // Don't write macro definition for imported macros
 958         // if !self.mac_defs.contains(&data.callee_span)
 959         //     && !data.imported {
 960         //     self.mac_defs.insert(data.callee_span);
 961         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
 962         //         self.dumper.macro_data(MacroData {
 963         //             span: sub_span,
 964         //             name: data.name.clone(),
 965         //             qualname: qualname.clone(),
 966         //             // FIXME where do macro docs come from?
 967         //             docs: String::new(),
 968         //         }.lower(self.tcx));
 969         //     }
 970         // }
 971     }
 972
 973     fn process_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>, trait_id: DefId) {
 974         self.process_macro_use(trait_item.span);
 975         match trait_item.kind {
 976             hir::TraitItemKind::Const(ref ty, body) => {
 977                 let body = body.map(|b| &self.tcx.hir().body(b).value);
 978                 let attrs = self.tcx.hir().attrs(trait_item.hir_id());
 979                 self.process_assoc_const(
 980                     trait_item.def_id,
 981                     trait_item.ident,
 982                     &ty,
 983                     body,
 984                     trait_id,
 985                     attrs,
 986                 );
 987             }
 988             hir::TraitItemKind::Fn(ref sig, ref trait_fn) => {
 989                 let body =
 990                     if let hir::TraitFn::Provided(body) = trait_fn { Some(*body) } else { None };
 991                 self.process_method(
 992                     sig,
 993                     body,
 994                     trait_item.def_id,
 995                     trait_item.ident,
 996                     &trait_item.generics,
 997                     trait_item.span,
 998                 );
 999             }
1000             hir::TraitItemKind::Type(ref bounds, ref default_ty) => {
1001                 // FIXME do something with _bounds (for type refs)
1002                 let name = trait_item.ident.name.to_string();
1003                 let qualname =
1004                     format!("::{}", self.tcx.def_path_str(trait_item.def_id.to_def_id()));
1005
1006                 if !self.span.filter_generated(trait_item.ident.span) {
1007                     let span = self.span_from_span(trait_item.ident.span);
1008                     let id = id_from_def_id(trait_item.def_id.to_def_id());
1009                     let attrs = self.tcx.hir().attrs(trait_item.hir_id());
1010
1011                     self.dumper.dump_def(
1012                         &Access { public: true, reachable: true },
1013                         Def {
1014                             kind: DefKind::Type,
1015                             id,
1016                             span,
1017                             name,
1018                             qualname,
1019                             value: self.span.snippet(trait_item.span),
1020                             parent: Some(id_from_def_id(trait_id)),
1021                             children: vec![],
1022                             decl_id: None,
1023                             docs: self.save_ctxt.docs_for_attrs(attrs),
1024                             sig: sig::assoc_type_signature(
1025                                 trait_item.hir_id(),
1026                                 trait_item.ident,
1027                                 Some(bounds),
1028                                 default_ty.as_ref().map(|ty| &**ty),
1029                                 &self.save_ctxt,
1030                             ),
1031                             attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
1032                         },
1033                     );
1034                 }
1035
1036                 if let Some(default_ty) = default_ty {
1037                     self.visit_ty(default_ty)
1038                 }
1039             }
1040         }
1041     }
1042
1043     fn process_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>, impl_id: DefId) {
1044         self.process_macro_use(impl_item.span);
1045         match impl_item.kind {
1046             hir::ImplItemKind::Const(ref ty, body) => {
1047                 let body = self.tcx.hir().body(body);
1048                 let attrs = self.tcx.hir().attrs(impl_item.hir_id());
1049                 self.process_assoc_const(
1050                     impl_item.def_id,
1051                     impl_item.ident,
1052                     &ty,
1053                     Some(&body.value),
1054                     impl_id,
1055                     attrs,
1056                 );
1057             }
1058             hir::ImplItemKind::Fn(ref sig, body) => {
1059                 self.process_method(
1060                     sig,
1061                     Some(body),
1062                     impl_item.def_id,
1063                     impl_item.ident,
1064                     &impl_item.generics,
1065                     impl_item.span,
1066                 );
1067             }
1068             hir::ImplItemKind::TyAlias(ref ty) => {
1069                 // FIXME: uses of the assoc type should ideally point to this
1070                 // 'def' and the name here should be a ref to the def in the
1071                 // trait.
1072                 self.visit_ty(ty)
1073             }
1074         }
1075     }
1076
1077     pub(crate) fn process_crate(&mut self) {
1078         let id = hir::CRATE_HIR_ID;
1079         let qualname =
1080             format!("::{}", self.tcx.def_path_str(self.tcx.hir().local_def_id(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_hir_id(id, &self.save_ctxt);
1086         let children =
1087             krate_mod.item_ids.iter().map(|i| id_from_def_id(i.def_id.to_def_id())).collect();
1088         let span = self.span_from_span(krate_mod.spans.inner_span);
1089         let attrs = self.tcx.hir().attrs(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.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.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.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.def_id);
1165                         let span = self.span_from_span(sub_span);
1166                         let parent = self.save_ctxt.tcx.local_parent(item.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.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.def_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.def_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.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, t.span);
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(self.tcx.hir().local_def_id(anon_const.hir_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.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, args, _) => self.process_method_call(ex, seg, args),
1346             hir::ExprKind::Field(ref sub_ex, _) => {
1347                 self.visit_expr(&sub_ex);
1348
1349                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1350                     down_cast_data!(field_data, RefData, ex.span);
1351                     if !generated_code(ex.span) {
1352                         self.dumper.dump_ref(field_data);
1353                     }
1354                 }
1355             }
1356             hir::ExprKind::Closure(&hir::Closure { ref fn_decl, body, .. }) => {
1357                 let id = format!("${}", ex.hir_id);
1358
1359                 // walk arg and return types
1360                 for ty in fn_decl.inputs {
1361                     self.visit_ty(ty);
1362                 }
1363
1364                 if let hir::FnRetTy::Return(ref ret_ty) = fn_decl.output {
1365                     self.visit_ty(ret_ty);
1366                 }
1367
1368                 // walk the body
1369                 let map = self.tcx.hir();
1370                 self.nest_typeck_results(self.tcx.hir().local_def_id(ex.hir_id), |v| {
1371                     let body = map.body(body);
1372                     v.process_formals(body.params, &id);
1373                     v.visit_expr(&body.value)
1374                 });
1375             }
1376             hir::ExprKind::Repeat(ref expr, ref length) => {
1377                 self.visit_expr(expr);
1378                 let map = self.tcx.hir();
1379                 match length {
1380                     // FIXME(generic_arg_infer): We probably want to
1381                     // output the inferred type here? :shrug:
1382                     hir::ArrayLen::Infer(..) => {}
1383                     hir::ArrayLen::Body(anon_const) => self
1384                         .nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
1385                             v.visit_expr(&map.body(anon_const.body).value)
1386                         }),
1387                 }
1388             }
1389             // In particular, we take this branch for call and path expressions,
1390             // where we'll index the idents involved just by continuing to walk.
1391             _ => intravisit::walk_expr(self, ex),
1392         }
1393     }
1394
1395     fn visit_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
1396         self.process_macro_use(p.span);
1397         self.process_pat(p);
1398     }
1399
1400     fn visit_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) {
1401         self.process_var_decl(&arm.pat);
1402         if let Some(hir::Guard::If(expr)) = &arm.guard {
1403             self.visit_expr(expr);
1404         }
1405         self.visit_expr(&arm.body);
1406     }
1407
1408     fn visit_qpath(&mut self, path: &'tcx hir::QPath<'tcx>, id: hir::HirId, _: Span) {
1409         self.process_path(id, path);
1410     }
1411
1412     fn visit_stmt(&mut self, s: &'tcx hir::Stmt<'tcx>) {
1413         self.process_macro_use(s.span);
1414         intravisit::walk_stmt(self, s)
1415     }
1416
1417     fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
1418         self.process_macro_use(l.span);
1419         self.process_var_decl(&l.pat);
1420
1421         // Just walk the initializer, the else branch and type (don't want to walk the pattern again).
1422         walk_list!(self, visit_ty, &l.ty);
1423         walk_list!(self, visit_expr, &l.init);
1424         walk_list!(self, visit_block, l.els);
1425     }
1426
1427     fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem<'tcx>) {
1428         let access = access_from!(self.save_ctxt, item.def_id);
1429
1430         match item.kind {
1431             hir::ForeignItemKind::Fn(decl, _, ref generics) => {
1432                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1433                     down_cast_data!(fn_data, DefData, item.span);
1434
1435                     self.process_generic_params(generics, &fn_data.qualname, item.hir_id());
1436                     self.dumper.dump_def(&access, fn_data);
1437                 }
1438
1439                 for ty in decl.inputs {
1440                     self.visit_ty(ty);
1441                 }
1442
1443                 if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
1444                     self.visit_ty(ret_ty);
1445                 }
1446             }
1447             hir::ForeignItemKind::Static(ref ty, _) => {
1448                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1449                     down_cast_data!(var_data, DefData, item.span);
1450                     self.dumper.dump_def(&access, var_data);
1451                 }
1452
1453                 self.visit_ty(ty);
1454             }
1455             hir::ForeignItemKind::Type => {
1456                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1457                     down_cast_data!(var_data, DefData, item.span);
1458                     self.dumper.dump_def(&access, var_data);
1459                 }
1460             }
1461         }
1462     }
1463 }