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::source_map::respan;
  29 use rustc_span::symbol::Ident;
  30 use rustc_span::*;
  31
  32 use std::env;
  33 use std::path::Path;
  34
  35 use crate::dumper::{Access, Dumper};
  36 use crate::sig;
  37 use crate::span_utils::SpanUtils;
  38 use crate::{
  39     escape, generated_code, id_from_def_id, id_from_hir_id, lower_attributes, PathCollector,
  40     SaveContext,
  41 };
  42
  43 use rls_data::{
  44     CompilationOptions, CratePreludeData, Def, DefKind, GlobalCrateId, Import, ImportKind, Ref,
  45     RefKind, Relation, RelationKind, SpanData,
  46 };
  47
  48 use tracing::{debug, error};
  49
  50 #[rustfmt::skip] // https://github.com/rust-lang/rustfmt/issues/5213
  51 macro_rules! down_cast_data {
  52     ($id:ident, $kind:ident, $sp:expr) => {
  53         let super::Data::$kind($id) = $id else {
  54             span_bug!($sp, "unexpected data kind: {:?}", $id);
  55         };
  56     };
  57 }
  58
  59 macro_rules! access_from {
  60     ($save_ctxt:expr, $item:expr, $id:expr) => {
  61         Access {
  62             public: $item.vis.node.is_pub(),
  63             reachable: $save_ctxt.access_levels.is_reachable($id),
  64         }
  65     };
  66 }
  67
  68 macro_rules! access_from_vis {
  69     ($save_ctxt:expr, $vis:expr, $id:expr) => {
  70         Access { public: $vis.node.is_pub(), reachable: $save_ctxt.access_levels.is_reachable($id) }
  71     };
  72 }
  73
  74 pub struct DumpVisitor<'tcx> {
  75     pub save_ctxt: SaveContext<'tcx>,
  76     tcx: TyCtxt<'tcx>,
  77     dumper: Dumper,
  78
  79     span: SpanUtils<'tcx>,
  80     // Set of macro definition (callee) spans, and the set
  81     // of macro use (callsite) spans. We store these to ensure
  82     // we only write one macro def per unique macro definition, and
  83     // one macro use per unique callsite span.
  84     // mac_defs: FxHashSet<Span>,
  85     // macro_calls: FxHashSet<Span>,
  86 }
  87
  88 impl<'tcx> DumpVisitor<'tcx> {
  89     pub fn new(save_ctxt: SaveContext<'tcx>) -> DumpVisitor<'tcx> {
  90         let span_utils = SpanUtils::new(&save_ctxt.tcx.sess);
  91         let dumper = Dumper::new(save_ctxt.config.clone());
  92         DumpVisitor {
  93             tcx: save_ctxt.tcx,
  94             save_ctxt,
  95             dumper,
  96             span: span_utils,
  97             // mac_defs: FxHashSet::default(),
  98             // macro_calls: FxHashSet::default(),
  99         }
 100     }
 101
 102     pub fn analysis(&self) -> &rls_data::Analysis {
 103         self.dumper.analysis()
 104     }
 105
 106     fn nest_typeck_results<F>(&mut self, item_def_id: LocalDefId, f: F)
 107     where
 108         F: FnOnce(&mut Self),
 109     {
 110         let typeck_results = if self.tcx.has_typeck_results(item_def_id) {
 111             Some(self.tcx.typeck(item_def_id))
 112         } else {
 113             None
 114         };
 115
 116         let old_maybe_typeck_results = self.save_ctxt.maybe_typeck_results;
 117         self.save_ctxt.maybe_typeck_results = typeck_results;
 118         f(self);
 119         self.save_ctxt.maybe_typeck_results = old_maybe_typeck_results;
 120     }
 121
 122     fn span_from_span(&self, span: Span) -> SpanData {
 123         self.save_ctxt.span_from_span(span)
 124     }
 125
 126     fn lookup_def_id(&self, ref_id: hir::HirId) -> Option<DefId> {
 127         self.save_ctxt.lookup_def_id(ref_id)
 128     }
 129
 130     pub fn dump_crate_info(&mut self, name: &str) {
 131         let source_file = self.tcx.sess.local_crate_source_file.as_ref();
 132         let crate_root = source_file.map(|source_file| {
 133             let source_file = Path::new(source_file);
 134             match source_file.file_name() {
 135                 Some(_) => source_file.parent().unwrap().display(),
 136                 None => source_file.display(),
 137             }
 138             .to_string()
 139         });
 140
 141         let data = CratePreludeData {
 142             crate_id: GlobalCrateId {
 143                 name: name.into(),
 144                 disambiguator: (self.tcx.sess.local_stable_crate_id().to_u64(), 0),
 145             },
 146             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 147             external_crates: self.save_ctxt.get_external_crates(),
 148             span: self.span_from_span(self.tcx.def_span(CRATE_DEF_ID)),
 149         };
 150
 151         self.dumper.crate_prelude(data);
 152     }
 153
 154     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
 155         // Apply possible `remap-path-prefix` remapping to the input source file
 156         // (and don't include remapping args anymore)
 157         let (program, arguments) = {
 158             let remap_arg_indices = {
 159                 let mut indices = FxHashSet::default();
 160                 // Args are guaranteed to be valid UTF-8 (checked early)
 161                 for (i, e) in env::args().enumerate() {
 162                     if e.starts_with("--remap-path-prefix=") {
 163                         indices.insert(i);
 164                     } else if e == "--remap-path-prefix" {
 165                         indices.insert(i);
 166                         indices.insert(i + 1);
 167                     }
 168                 }
 169                 indices
 170             };
 171
 172             let mut args = env::args()
 173                 .enumerate()
 174                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 175                 .map(|(_, arg)| match input {
 176                     Input::File(ref path) if path == Path::new(&arg) => {
 177                         let mapped = &self.tcx.sess.local_crate_source_file;
 178                         mapped.as_ref().unwrap().to_string_lossy().into()
 179                     }
 180                     _ => arg,
 181                 });
 182
 183             (args.next().unwrap(), args.collect())
 184         };
 185
 186         let data = CompilationOptions {
 187             directory: self.tcx.sess.opts.working_dir.remapped_path_if_available().into(),
 188             program,
 189             arguments,
 190             output: self.save_ctxt.compilation_output(crate_name),
 191         };
 192
 193         self.dumper.compilation_opts(data);
 194     }
 195
 196     fn write_segments(&mut self, segments: impl IntoIterator<Item = &'tcx hir::PathSegment<'tcx>>) {
 197         for seg in segments {
 198             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 199                 self.dumper.dump_ref(data);
 200             }
 201         }
 202     }
 203
 204     fn write_sub_paths(&mut self, path: &'tcx hir::Path<'tcx>) {
 205         self.write_segments(path.segments)
 206     }
 207
 208     // As write_sub_paths, but does not process the last ident in the path (assuming it
 209     // will be processed elsewhere). See note on write_sub_paths about global.
 210     fn write_sub_paths_truncated(&mut self, path: &'tcx hir::Path<'tcx>) {
 211         if let [segments @ .., _] = path.segments {
 212             self.write_segments(segments)
 213         }
 214     }
 215
 216     fn process_formals(&mut self, formals: &'tcx [hir::Param<'tcx>], qualname: &str) {
 217         for arg in formals {
 218             self.visit_pat(&arg.pat);
 219             let mut collector = PathCollector::new(self.tcx);
 220             collector.visit_pat(&arg.pat);
 221
 222             for (hir_id, ident, ..) in collector.collected_idents {
 223                 let typ = match self.save_ctxt.typeck_results().node_type_opt(hir_id) {
 224                     Some(s) => s.to_string(),
 225                     None => continue,
 226                 };
 227                 if !self.span.filter_generated(ident.span) {
 228                     let id = id_from_hir_id(hir_id, &self.save_ctxt);
 229                     let span = self.span_from_span(ident.span);
 230
 231                     self.dumper.dump_def(
 232                         &Access { public: false, reachable: false },
 233                         Def {
 234                             kind: DefKind::Local,
 235                             id,
 236                             span,
 237                             name: ident.to_string(),
 238                             qualname: format!("{}::{}", qualname, ident),
 239                             value: typ,
 240                             parent: None,
 241                             children: vec![],
 242                             decl_id: None,
 243                             docs: String::new(),
 244                             sig: None,
 245                             attributes: vec![],
 246                         },
 247                     );
 248                 }
 249             }
 250         }
 251     }
 252
 253     fn process_method(
 254         &mut self,
 255         sig: &'tcx hir::FnSig<'tcx>,
 256         body: Option<hir::BodyId>,
 257         def_id: LocalDefId,
 258         ident: Ident,
 259         generics: &'tcx hir::Generics<'tcx>,
 260         vis: &hir::Visibility<'tcx>,
 261         span: Span,
 262     ) {
 263         debug!("process_method: {:?}:{}", def_id, ident);
 264
 265         let map = &self.tcx.hir();
 266         let hir_id = map.local_def_id_to_hir_id(def_id);
 267         self.nest_typeck_results(def_id, |v| {
 268             if let Some(mut method_data) = v.save_ctxt.get_method_data(hir_id, ident, span) {
 269                 if let Some(body) = body {
 270                     v.process_formals(map.body(body).params, &method_data.qualname);
 271                 }
 272                 v.process_generic_params(&generics, &method_data.qualname, hir_id);
 273
 274                 method_data.value =
 275                     fn_to_string(sig.decl, sig.header, Some(ident.name), generics, vis, &[], None);
 276                 method_data.sig = sig::method_signature(hir_id, ident, generics, sig, &v.save_ctxt);
 277
 278                 v.dumper.dump_def(&access_from_vis!(v.save_ctxt, vis, def_id), method_data);
 279             }
 280
 281             // walk arg and return types
 282             for arg in sig.decl.inputs {
 283                 v.visit_ty(arg);
 284             }
 285
 286             if let hir::FnRetTy::Return(ref ret_ty) = sig.decl.output {
 287                 v.visit_ty(ret_ty)
 288             }
 289
 290             // walk the fn body
 291             if let Some(body) = body {
 292                 v.visit_expr(&map.body(body).value);
 293             }
 294         });
 295     }
 296
 297     fn process_struct_field_def(
 298         &mut self,
 299         field: &'tcx hir::FieldDef<'tcx>,
 300         parent_id: hir::HirId,
 301     ) {
 302         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 303         if let Some(field_data) = field_data {
 304             self.dumper.dump_def(
 305                 &access_from!(self.save_ctxt, field, self.tcx.hir().local_def_id(field.hir_id)),
 306                 field_data,
 307             );
 308         }
 309     }
 310
 311     // Dump generic params bindings, then visit_generics
 312     fn process_generic_params(
 313         &mut self,
 314         generics: &'tcx hir::Generics<'tcx>,
 315         prefix: &str,
 316         id: hir::HirId,
 317     ) {
 318         for param in generics.params {
 319             match param.kind {
 320                 hir::GenericParamKind::Lifetime { .. } => {}
 321                 hir::GenericParamKind::Type { .. } => {
 322                     let param_ss = param.name.ident().span;
 323                     let name = escape(self.span.snippet(param_ss));
 324                     // Append $id to name to make sure each one is unique.
 325                     let qualname = format!("{}::{}${}", prefix, name, id);
 326                     if !self.span.filter_generated(param_ss) {
 327                         let id = id_from_hir_id(param.hir_id, &self.save_ctxt);
 328                         let span = self.span_from_span(param_ss);
 329
 330                         self.dumper.dump_def(
 331                             &Access { public: false, reachable: false },
 332                             Def {
 333                                 kind: DefKind::Type,
 334                                 id,
 335                                 span,
 336                                 name,
 337                                 qualname,
 338                                 value: String::new(),
 339                                 parent: None,
 340                                 children: vec![],
 341                                 decl_id: None,
 342                                 docs: String::new(),
 343                                 sig: None,
 344                                 attributes: vec![],
 345                             },
 346                         );
 347                     }
 348                 }
 349                 hir::GenericParamKind::Const { .. } => {}
 350             }
 351         }
 352
 353         self.visit_generics(generics)
 354     }
 355
 356     fn process_fn(
 357         &mut self,
 358         item: &'tcx hir::Item<'tcx>,
 359         decl: &'tcx hir::FnDecl<'tcx>,
 360         _header: &'tcx hir::FnHeader,
 361         ty_params: &'tcx hir::Generics<'tcx>,
 362         body: hir::BodyId,
 363     ) {
 364         let map = &self.tcx.hir();
 365         self.nest_typeck_results(item.def_id, |v| {
 366             let body = map.body(body);
 367             if let Some(fn_data) = v.save_ctxt.get_item_data(item) {
 368                 down_cast_data!(fn_data, DefData, item.span);
 369                 v.process_formals(body.params, &fn_data.qualname);
 370                 v.process_generic_params(ty_params, &fn_data.qualname, item.hir_id());
 371
 372                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, item.def_id), fn_data);
 373             }
 374
 375             for arg in decl.inputs {
 376                 v.visit_ty(arg)
 377             }
 378
 379             if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
 380                 v.visit_ty(ret_ty)
 381             }
 382
 383             v.visit_expr(&body.value);
 384         });
 385     }
 386
 387     fn process_static_or_const_item(
 388         &mut self,
 389         item: &'tcx hir::Item<'tcx>,
 390         typ: &'tcx hir::Ty<'tcx>,
 391         expr: &'tcx hir::Expr<'tcx>,
 392     ) {
 393         self.nest_typeck_results(item.def_id, |v| {
 394             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 395                 down_cast_data!(var_data, DefData, item.span);
 396                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, item.def_id), var_data);
 397             }
 398             v.visit_ty(&typ);
 399             v.visit_expr(expr);
 400         });
 401     }
 402
 403     fn process_assoc_const(
 404         &mut self,
 405         def_id: LocalDefId,
 406         ident: Ident,
 407         typ: &'tcx hir::Ty<'tcx>,
 408         expr: Option<&'tcx hir::Expr<'tcx>>,
 409         parent_id: DefId,
 410         vis: &hir::Visibility<'tcx>,
 411         attrs: &'tcx [ast::Attribute],
 412     ) {
 413         let qualname = format!("::{}", self.tcx.def_path_str(def_id.to_def_id()));
 414
 415         if !self.span.filter_generated(ident.span) {
 416             let hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id);
 417             let sig = sig::assoc_const_signature(hir_id, ident.name, typ, expr, &self.save_ctxt);
 418             let span = self.span_from_span(ident.span);
 419
 420             self.dumper.dump_def(
 421                 &access_from_vis!(self.save_ctxt, vis, def_id),
 422                 Def {
 423                     kind: DefKind::Const,
 424                     id: id_from_hir_id(hir_id, &self.save_ctxt),
 425                     span,
 426                     name: ident.name.to_string(),
 427                     qualname,
 428                     value: ty_to_string(&typ),
 429                     parent: Some(id_from_def_id(parent_id)),
 430                     children: vec![],
 431                     decl_id: None,
 432                     docs: self.save_ctxt.docs_for_attrs(attrs),
 433                     sig,
 434                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 435                 },
 436             );
 437         }
 438
 439         // walk type and init value
 440         self.nest_typeck_results(def_id, |v| {
 441             v.visit_ty(typ);
 442             if let Some(expr) = expr {
 443                 v.visit_expr(expr);
 444             }
 445         });
 446     }
 447
 448     // FIXME tuple structs should generate tuple-specific data.
 449     fn process_struct(
 450         &mut self,
 451         item: &'tcx hir::Item<'tcx>,
 452         def: &'tcx hir::VariantData<'tcx>,
 453         ty_params: &'tcx hir::Generics<'tcx>,
 454     ) {
 455         debug!("process_struct {:?} {:?}", item, item.span);
 456         let name = item.ident.to_string();
 457         let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
 458
 459         let kind = match item.kind {
 460             hir::ItemKind::Struct(_, _) => DefKind::Struct,
 461             hir::ItemKind::Union(_, _) => DefKind::Union,
 462             _ => unreachable!(),
 463         };
 464
 465         let (value, fields) = match item.kind {
 466             hir::ItemKind::Struct(hir::VariantData::Struct(ref fields, ..), ..)
 467             | hir::ItemKind::Union(hir::VariantData::Struct(ref fields, ..), ..) => {
 468                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 469                 let fields_str = fields
 470                     .iter()
 471                     .filter_map(|f| {
 472                         if include_priv_fields || f.vis.node.is_pub() {
 473                             Some(f.ident.to_string())
 474                         } else {
 475                             None
 476                         }
 477                     })
 478                     .collect::<Vec<_>>()
 479                     .join(", ");
 480                 let value = format!("{} {{ {} }}", name, fields_str);
 481                 (value, fields.iter().map(|f| id_from_hir_id(f.hir_id, &self.save_ctxt)).collect())
 482             }
 483             _ => (String::new(), vec![]),
 484         };
 485
 486         if !self.span.filter_generated(item.ident.span) {
 487             let span = self.span_from_span(item.ident.span);
 488             let attrs = self.tcx.hir().attrs(item.hir_id());
 489             self.dumper.dump_def(
 490                 &access_from!(self.save_ctxt, item, item.def_id),
 491                 Def {
 492                     kind,
 493                     id: id_from_def_id(item.def_id.to_def_id()),
 494                     span,
 495                     name,
 496                     qualname: qualname.clone(),
 497                     value,
 498                     parent: None,
 499                     children: fields,
 500                     decl_id: None,
 501                     docs: self.save_ctxt.docs_for_attrs(attrs),
 502                     sig: sig::item_signature(item, &self.save_ctxt),
 503                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 504                 },
 505             );
 506         }
 507
 508         self.nest_typeck_results(item.def_id, |v| {
 509             for field in def.fields() {
 510                 v.process_struct_field_def(field, item.hir_id());
 511                 v.visit_ty(&field.ty);
 512             }
 513
 514             v.process_generic_params(ty_params, &qualname, item.hir_id());
 515         });
 516     }
 517
 518     fn process_enum(
 519         &mut self,
 520         item: &'tcx hir::Item<'tcx>,
 521         enum_definition: &'tcx hir::EnumDef<'tcx>,
 522         ty_params: &'tcx hir::Generics<'tcx>,
 523     ) {
 524         let enum_data = self.save_ctxt.get_item_data(item);
 525         let enum_data = match enum_data {
 526             None => return,
 527             Some(data) => data,
 528         };
 529         down_cast_data!(enum_data, DefData, item.span);
 530
 531         let access = access_from!(self.save_ctxt, item, item.def_id);
 532
 533         for variant in enum_definition.variants {
 534             let name = variant.ident.name.to_string();
 535             let qualname = format!("{}::{}", enum_data.qualname, name);
 536             let name_span = variant.ident.span;
 537
 538             match variant.data {
 539                 hir::VariantData::Struct(ref fields, ..) => {
 540                     let fields_str =
 541                         fields.iter().map(|f| f.ident.to_string()).collect::<Vec<_>>().join(", ");
 542                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 543                     if !self.span.filter_generated(name_span) {
 544                         let span = self.span_from_span(name_span);
 545                         let id = id_from_hir_id(variant.id, &self.save_ctxt);
 546                         let parent = Some(id_from_def_id(item.def_id.to_def_id()));
 547                         let attrs = self.tcx.hir().attrs(variant.id);
 548
 549                         self.dumper.dump_def(
 550                             &access,
 551                             Def {
 552                                 kind: DefKind::StructVariant,
 553                                 id,
 554                                 span,
 555                                 name,
 556                                 qualname,
 557                                 value,
 558                                 parent,
 559                                 children: vec![],
 560                                 decl_id: None,
 561                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 562                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 563                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 564                             },
 565                         );
 566                     }
 567                 }
 568                 ref v => {
 569                     let mut value = format!("{}::{}", enum_data.name, name);
 570                     if let hir::VariantData::Tuple(fields, _) = v {
 571                         value.push('(');
 572                         value.push_str(
 573                             &fields
 574                                 .iter()
 575                                 .map(|f| ty_to_string(&f.ty))
 576                                 .collect::<Vec<_>>()
 577                                 .join(", "),
 578                         );
 579                         value.push(')');
 580                     }
 581                     if !self.span.filter_generated(name_span) {
 582                         let span = self.span_from_span(name_span);
 583                         let id = id_from_hir_id(variant.id, &self.save_ctxt);
 584                         let parent = Some(id_from_def_id(item.def_id.to_def_id()));
 585                         let attrs = self.tcx.hir().attrs(variant.id);
 586
 587                         self.dumper.dump_def(
 588                             &access,
 589                             Def {
 590                                 kind: DefKind::TupleVariant,
 591                                 id,
 592                                 span,
 593                                 name,
 594                                 qualname,
 595                                 value,
 596                                 parent,
 597                                 children: vec![],
 598                                 decl_id: None,
 599                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 600                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 601                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 602                             },
 603                         );
 604                     }
 605                 }
 606             }
 607
 608             for field in variant.data.fields() {
 609                 self.process_struct_field_def(field, variant.id);
 610                 self.visit_ty(field.ty);
 611             }
 612         }
 613         self.process_generic_params(ty_params, &enum_data.qualname, item.hir_id());
 614         self.dumper.dump_def(&access, enum_data);
 615     }
 616
 617     fn process_impl(&mut self, item: &'tcx hir::Item<'tcx>, impl_: &'tcx hir::Impl<'tcx>) {
 618         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 619             if !self.span.filter_generated(item.span) {
 620                 if let super::Data::RelationData(rel, imp) = impl_data {
 621                     self.dumper.dump_relation(rel);
 622                     self.dumper.dump_impl(imp);
 623                 } else {
 624                     span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 625                 }
 626             }
 627         }
 628
 629         let map = &self.tcx.hir();
 630         self.nest_typeck_results(item.def_id, |v| {
 631             v.visit_ty(&impl_.self_ty);
 632             if let Some(trait_ref) = &impl_.of_trait {
 633                 v.process_path(trait_ref.hir_ref_id, &hir::QPath::Resolved(None, &trait_ref.path));
 634             }
 635             v.process_generic_params(&impl_.generics, "", item.hir_id());
 636             for impl_item in impl_.items {
 637                 v.process_impl_item(map.impl_item(impl_item.id), item.def_id.to_def_id());
 638             }
 639         });
 640     }
 641
 642     fn process_trait(
 643         &mut self,
 644         item: &'tcx hir::Item<'tcx>,
 645         generics: &'tcx hir::Generics<'tcx>,
 646         trait_refs: hir::GenericBounds<'tcx>,
 647         methods: &'tcx [hir::TraitItemRef],
 648     ) {
 649         let name = item.ident.to_string();
 650         let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
 651         let mut val = name.clone();
 652         if !generics.params.is_empty() {
 653             val.push_str(&generic_params_to_string(generics.params));
 654         }
 655         if !trait_refs.is_empty() {
 656             val.push_str(": ");
 657             val.push_str(&bounds_to_string(trait_refs));
 658         }
 659         if !self.span.filter_generated(item.ident.span) {
 660             let id = id_from_def_id(item.def_id.to_def_id());
 661             let span = self.span_from_span(item.ident.span);
 662             let children =
 663                 methods.iter().map(|i| id_from_def_id(i.id.def_id.to_def_id())).collect();
 664             let attrs = self.tcx.hir().attrs(item.hir_id());
 665             self.dumper.dump_def(
 666                 &access_from!(self.save_ctxt, item, item.def_id),
 667                 Def {
 668                     kind: DefKind::Trait,
 669                     id,
 670                     span,
 671                     name,
 672                     qualname: qualname.clone(),
 673                     value: val,
 674                     parent: None,
 675                     children,
 676                     decl_id: None,
 677                     docs: self.save_ctxt.docs_for_attrs(attrs),
 678                     sig: sig::item_signature(item, &self.save_ctxt),
 679                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 680                 },
 681             );
 682         }
 683
 684         // supertraits
 685         for super_bound in trait_refs.iter() {
 686             let (def_id, sub_span) = match *super_bound {
 687                 hir::GenericBound::Trait(ref trait_ref, _) => (
 688                     self.lookup_def_id(trait_ref.trait_ref.hir_ref_id),
 689                     trait_ref.trait_ref.path.segments.last().unwrap().ident.span,
 690                 ),
 691                 hir::GenericBound::LangItemTrait(lang_item, span, _, _) => {
 692                     (Some(self.tcx.require_lang_item(lang_item, Some(span))), span)
 693                 }
 694                 hir::GenericBound::Outlives(..) => continue,
 695             };
 696
 697             if let Some(id) = def_id {
 698                 if !self.span.filter_generated(sub_span) {
 699                     let span = self.span_from_span(sub_span);
 700                     self.dumper.dump_ref(Ref {
 701                         kind: RefKind::Type,
 702                         span: span.clone(),
 703                         ref_id: id_from_def_id(id),
 704                     });
 705
 706                     self.dumper.dump_relation(Relation {
 707                         kind: RelationKind::SuperTrait,
 708                         span,
 709                         from: id_from_def_id(id),
 710                         to: id_from_def_id(item.def_id.to_def_id()),
 711                     });
 712                 }
 713             }
 714         }
 715
 716         // walk generics and methods
 717         self.process_generic_params(generics, &qualname, item.hir_id());
 718         for method in methods {
 719             let map = &self.tcx.hir();
 720             self.process_trait_item(map.trait_item(method.id), item.def_id.to_def_id())
 721         }
 722     }
 723
 724     // `item` is the module in question, represented as an( item.
 725     fn process_mod(&mut self, item: &'tcx hir::Item<'tcx>) {
 726         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 727             down_cast_data!(mod_data, DefData, item.span);
 728             self.dumper.dump_def(&access_from!(self.save_ctxt, item, item.def_id), mod_data);
 729         }
 730     }
 731
 732     fn dump_path_ref(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 733         let path_data = self.save_ctxt.get_path_data(id, path);
 734         if let Some(path_data) = path_data {
 735             self.dumper.dump_ref(path_data);
 736         }
 737     }
 738
 739     fn dump_path_segment_ref(&mut self, id: hir::HirId, segment: &hir::PathSegment<'tcx>) {
 740         let segment_data = self.save_ctxt.get_path_segment_data_with_id(segment, id);
 741         if let Some(segment_data) = segment_data {
 742             self.dumper.dump_ref(segment_data);
 743         }
 744     }
 745
 746     fn process_path(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 747         if self.span.filter_generated(path.span()) {
 748             return;
 749         }
 750         self.dump_path_ref(id, path);
 751
 752         // Type arguments
 753         let segments = match path {
 754             hir::QPath::Resolved(ty, path) => {
 755                 if let Some(ty) = ty {
 756                     self.visit_ty(ty);
 757                 }
 758                 path.segments
 759             }
 760             hir::QPath::TypeRelative(ty, segment) => {
 761                 self.visit_ty(ty);
 762                 std::slice::from_ref(*segment)
 763             }
 764             hir::QPath::LangItem(..) => return,
 765         };
 766         for seg in segments {
 767             if let Some(ref generic_args) = seg.args {
 768                 for arg in generic_args.args {
 769                     if let hir::GenericArg::Type(ref ty) = arg {
 770                         self.visit_ty(ty);
 771                     }
 772                 }
 773             }
 774         }
 775
 776         if let hir::QPath::Resolved(_, path) = path {
 777             self.write_sub_paths_truncated(path);
 778         }
 779     }
 780
 781     fn process_struct_lit(
 782         &mut self,
 783         ex: &'tcx hir::Expr<'tcx>,
 784         path: &'tcx hir::QPath<'tcx>,
 785         fields: &'tcx [hir::ExprField<'tcx>],
 786         variant: &'tcx ty::VariantDef,
 787         rest: Option<&'tcx hir::Expr<'tcx>>,
 788     ) {
 789         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 790             if let hir::QPath::Resolved(_, path) = path {
 791                 self.write_sub_paths_truncated(path);
 792             }
 793             down_cast_data!(struct_lit_data, RefData, ex.span);
 794             if !generated_code(ex.span) {
 795                 self.dumper.dump_ref(struct_lit_data);
 796             }
 797
 798             for field in fields {
 799                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 800                     self.dumper.dump_ref(field_data);
 801                 }
 802
 803                 self.visit_expr(&field.expr)
 804             }
 805         }
 806
 807         if let Some(base) = rest {
 808             self.visit_expr(&base);
 809         }
 810     }
 811
 812     fn process_method_call(
 813         &mut self,
 814         ex: &'tcx hir::Expr<'tcx>,
 815         seg: &'tcx hir::PathSegment<'tcx>,
 816         args: &'tcx [hir::Expr<'tcx>],
 817     ) {
 818         debug!("process_method_call {:?} {:?}", ex, ex.span);
 819         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 820             down_cast_data!(mcd, RefData, ex.span);
 821             if !generated_code(ex.span) {
 822                 self.dumper.dump_ref(mcd);
 823             }
 824         }
 825
 826         // Explicit types in the turbo-fish.
 827         if let Some(generic_args) = seg.args {
 828             for arg in generic_args.args {
 829                 if let hir::GenericArg::Type(ty) = arg {
 830                     self.visit_ty(&ty)
 831                 };
 832             }
 833         }
 834
 835         // walk receiver and args
 836         walk_list!(self, visit_expr, args);
 837     }
 838
 839     fn process_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
 840         match p.kind {
 841             hir::PatKind::Struct(ref _path, fields, _) => {
 842                 // FIXME do something with _path?
 843                 let adt = match self.save_ctxt.typeck_results().node_type_opt(p.hir_id) {
 844                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
 845                     _ => {
 846                         intravisit::walk_pat(self, p);
 847                         return;
 848                     }
 849                 };
 850                 let variant = adt.variant_of_res(self.save_ctxt.get_path_res(p.hir_id));
 851
 852                 for field in fields {
 853                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 854                         if !self.span.filter_generated(field.ident.span) {
 855                             let span = self.span_from_span(field.ident.span);
 856                             self.dumper.dump_ref(Ref {
 857                                 kind: RefKind::Variable,
 858                                 span,
 859                                 ref_id: id_from_def_id(variant.fields[index].did),
 860                             });
 861                         }
 862                     }
 863                     self.visit_pat(&field.pat);
 864                 }
 865             }
 866             _ => intravisit::walk_pat(self, p),
 867         }
 868     }
 869
 870     fn process_var_decl(&mut self, pat: &'tcx hir::Pat<'tcx>) {
 871         // The pattern could declare multiple new vars,
 872         // we must walk the pattern and collect them all.
 873         let mut collector = PathCollector::new(self.tcx);
 874         collector.visit_pat(&pat);
 875         self.visit_pat(&pat);
 876
 877         // Process collected paths.
 878         for (id, ident, _) in collector.collected_idents {
 879             let res = self.save_ctxt.get_path_res(id);
 880             match res {
 881                 Res::Local(hir_id) => {
 882                     let typ = self
 883                         .save_ctxt
 884                         .typeck_results()
 885                         .node_type_opt(hir_id)
 886                         .map(|t| t.to_string())
 887                         .unwrap_or_default();
 888
 889                     // Rust uses the id of the pattern for var lookups, so we'll use it too.
 890                     if !self.span.filter_generated(ident.span) {
 891                         let qualname = format!("{}${}", ident, hir_id);
 892                         let id = id_from_hir_id(hir_id, &self.save_ctxt);
 893                         let span = self.span_from_span(ident.span);
 894
 895                         self.dumper.dump_def(
 896                             &Access { public: false, reachable: false },
 897                             Def {
 898                                 kind: DefKind::Local,
 899                                 id,
 900                                 span,
 901                                 name: ident.to_string(),
 902                                 qualname,
 903                                 value: typ,
 904                                 parent: None,
 905                                 children: vec![],
 906                                 decl_id: None,
 907                                 docs: String::new(),
 908                                 sig: None,
 909                                 attributes: vec![],
 910                             },
 911                         );
 912                     }
 913                 }
 914                 Res::Def(
 915                     HirDefKind::Ctor(..)
 916                     | HirDefKind::Const
 917                     | HirDefKind::AssocConst
 918                     | HirDefKind::Struct
 919                     | HirDefKind::Variant
 920                     | HirDefKind::TyAlias
 921                     | HirDefKind::AssocTy,
 922                     _,
 923                 )
 924                 | Res::SelfTy(..) => {
 925                     self.dump_path_segment_ref(id, &hir::PathSegment::from_ident(ident));
 926                 }
 927                 def => {
 928                     error!("unexpected definition kind when processing collected idents: {:?}", def)
 929                 }
 930             }
 931         }
 932
 933         for (id, ref path) in collector.collected_paths {
 934             self.process_path(id, path);
 935         }
 936     }
 937
 938     /// Extracts macro use and definition information from the AST node defined
 939     /// by the given NodeId, using the expansion information from the node's
 940     /// span.
 941     ///
 942     /// If the span is not macro-generated, do nothing, else use callee and
 943     /// callsite spans to record macro definition and use data, using the
 944     /// mac_uses and mac_defs sets to prevent multiples.
 945     fn process_macro_use(&mut self, _span: Span) {
 946         // FIXME if we're not dumping the defs (see below), there is no point
 947         // dumping refs either.
 948         // let source_span = span.source_callsite();
 949         // if !self.macro_calls.insert(source_span) {
 950         //     return;
 951         // }
 952
 953         // let data = match self.save_ctxt.get_macro_use_data(span) {
 954         //     None => return,
 955         //     Some(data) => data,
 956         // };
 957
 958         // self.dumper.macro_use(data);
 959
 960         // FIXME write the macro def
 961         // let mut hasher = DefaultHasher::new();
 962         // data.callee_span.hash(&mut hasher);
 963         // let hash = hasher.finish();
 964         // let qualname = format!("{}::{}", data.name, hash);
 965         // Don't write macro definition for imported macros
 966         // if !self.mac_defs.contains(&data.callee_span)
 967         //     && !data.imported {
 968         //     self.mac_defs.insert(data.callee_span);
 969         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
 970         //         self.dumper.macro_data(MacroData {
 971         //             span: sub_span,
 972         //             name: data.name.clone(),
 973         //             qualname: qualname.clone(),
 974         //             // FIXME where do macro docs come from?
 975         //             docs: String::new(),
 976         //         }.lower(self.tcx));
 977         //     }
 978         // }
 979     }
 980
 981     fn process_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>, trait_id: DefId) {
 982         self.process_macro_use(trait_item.span);
 983         let vis_span = trait_item.span.shrink_to_lo();
 984         match trait_item.kind {
 985             hir::TraitItemKind::Const(ref ty, body) => {
 986                 let body = body.map(|b| &self.tcx.hir().body(b).value);
 987                 let respan = respan(vis_span, hir::VisibilityKind::Public);
 988                 let attrs = self.tcx.hir().attrs(trait_item.hir_id());
 989                 self.process_assoc_const(
 990                     trait_item.def_id,
 991                     trait_item.ident,
 992                     &ty,
 993                     body,
 994                     trait_id,
 995                     &respan,
 996                     attrs,
 997                 );
 998             }
 999             hir::TraitItemKind::Fn(ref sig, ref trait_fn) => {
1000                 let body =
1001                     if let hir::TraitFn::Provided(body) = trait_fn { Some(*body) } else { None };
1002                 let respan = respan(vis_span, hir::VisibilityKind::Public);
1003                 self.process_method(
1004                     sig,
1005                     body,
1006                     trait_item.def_id,
1007                     trait_item.ident,
1008                     &trait_item.generics,
1009                     &respan,
1010                     trait_item.span,
1011                 );
1012             }
1013             hir::TraitItemKind::Type(ref bounds, ref default_ty) => {
1014                 // FIXME do something with _bounds (for type refs)
1015                 let name = trait_item.ident.name.to_string();
1016                 let qualname =
1017                     format!("::{}", self.tcx.def_path_str(trait_item.def_id.to_def_id()));
1018
1019                 if !self.span.filter_generated(trait_item.ident.span) {
1020                     let span = self.span_from_span(trait_item.ident.span);
1021                     let id = id_from_def_id(trait_item.def_id.to_def_id());
1022                     let attrs = self.tcx.hir().attrs(trait_item.hir_id());
1023
1024                     self.dumper.dump_def(
1025                         &Access { public: true, reachable: true },
1026                         Def {
1027                             kind: DefKind::Type,
1028                             id,
1029                             span,
1030                             name,
1031                             qualname,
1032                             value: self.span.snippet(trait_item.span),
1033                             parent: Some(id_from_def_id(trait_id)),
1034                             children: vec![],
1035                             decl_id: None,
1036                             docs: self.save_ctxt.docs_for_attrs(attrs),
1037                             sig: sig::assoc_type_signature(
1038                                 trait_item.hir_id(),
1039                                 trait_item.ident,
1040                                 Some(bounds),
1041                                 default_ty.as_ref().map(|ty| &**ty),
1042                                 &self.save_ctxt,
1043                             ),
1044                             attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
1045                         },
1046                     );
1047                 }
1048
1049                 if let Some(default_ty) = default_ty {
1050                     self.visit_ty(default_ty)
1051                 }
1052             }
1053         }
1054     }
1055
1056     fn process_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>, impl_id: DefId) {
1057         self.process_macro_use(impl_item.span);
1058         match impl_item.kind {
1059             hir::ImplItemKind::Const(ref ty, body) => {
1060                 let body = self.tcx.hir().body(body);
1061                 let attrs = self.tcx.hir().attrs(impl_item.hir_id());
1062                 self.process_assoc_const(
1063                     impl_item.def_id,
1064                     impl_item.ident,
1065                     &ty,
1066                     Some(&body.value),
1067                     impl_id,
1068                     &impl_item.vis,
1069                     attrs,
1070                 );
1071             }
1072             hir::ImplItemKind::Fn(ref sig, body) => {
1073                 self.process_method(
1074                     sig,
1075                     Some(body),
1076                     impl_item.def_id,
1077                     impl_item.ident,
1078                     &impl_item.generics,
1079                     &impl_item.vis,
1080                     impl_item.span,
1081                 );
1082             }
1083             hir::ImplItemKind::TyAlias(ref ty) => {
1084                 // FIXME: uses of the assoc type should ideally point to this
1085                 // 'def' and the name here should be a ref to the def in the
1086                 // trait.
1087                 self.visit_ty(ty)
1088             }
1089         }
1090     }
1091
1092     pub(crate) fn process_crate(&mut self) {
1093         let id = hir::CRATE_HIR_ID;
1094         let qualname =
1095             format!("::{}", self.tcx.def_path_str(self.tcx.hir().local_def_id(id).to_def_id()));
1096
1097         let sm = self.tcx.sess.source_map();
1098         let krate_mod = self.tcx.hir().root_module();
1099         let filename = sm.span_to_filename(krate_mod.inner);
1100         let data_id = id_from_hir_id(id, &self.save_ctxt);
1101         let children =
1102             krate_mod.item_ids.iter().map(|i| id_from_def_id(i.def_id.to_def_id())).collect();
1103         let span = self.span_from_span(krate_mod.inner);
1104         let attrs = self.tcx.hir().attrs(id);
1105
1106         self.dumper.dump_def(
1107             &Access { public: true, reachable: true },
1108             Def {
1109                 kind: DefKind::Mod,
1110                 id: data_id,
1111                 name: String::new(),
1112                 qualname,
1113                 span,
1114                 value: filename.prefer_remapped().to_string(),
1115                 children,
1116                 parent: None,
1117                 decl_id: None,
1118                 docs: self.save_ctxt.docs_for_attrs(attrs),
1119                 sig: None,
1120                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1121             },
1122         );
1123         self.tcx.hir().walk_toplevel_module(self);
1124     }
1125
1126     fn process_bounds(&mut self, bounds: hir::GenericBounds<'tcx>) {
1127         for bound in bounds {
1128             if let hir::GenericBound::Trait(ref trait_ref, _) = *bound {
1129                 self.process_path(
1130                     trait_ref.trait_ref.hir_ref_id,
1131                     &hir::QPath::Resolved(None, &trait_ref.trait_ref.path),
1132                 )
1133             }
1134         }
1135     }
1136 }
1137
1138 impl<'tcx> Visitor<'tcx> for DumpVisitor<'tcx> {
1139     type NestedFilter = nested_filter::All;
1140
1141     fn nested_visit_map(&mut self) -> Self::Map {
1142         self.tcx.hir()
1143     }
1144
1145     fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
1146         self.process_macro_use(item.span);
1147         match item.kind {
1148             hir::ItemKind::Use(path, hir::UseKind::Single) => {
1149                 let sub_span = path.segments.last().unwrap().ident.span;
1150                 if !self.span.filter_generated(sub_span) {
1151                     let access = access_from!(self.save_ctxt, item, item.def_id);
1152                     let ref_id = self.lookup_def_id(item.hir_id()).map(id_from_def_id);
1153                     let span = self.span_from_span(sub_span);
1154                     let parent =
1155                         self.save_ctxt.tcx.parent(item.def_id.to_def_id()).map(id_from_def_id);
1156                     self.dumper.import(
1157                         &access,
1158                         Import {
1159                             kind: ImportKind::Use,
1160                             ref_id,
1161                             span,
1162                             alias_span: None,
1163                             name: item.ident.to_string(),
1164                             value: String::new(),
1165                             parent,
1166                         },
1167                     );
1168                     self.write_sub_paths_truncated(&path);
1169                 }
1170             }
1171             hir::ItemKind::Use(path, hir::UseKind::Glob) => {
1172                 // Make a comma-separated list of names of imported modules.
1173                 let names = self.tcx.names_imported_by_glob_use(item.def_id);
1174                 let names: Vec<_> = names.iter().map(|n| n.to_string()).collect();
1175
1176                 // Otherwise it's a span with wrong macro expansion info, which
1177                 // we don't want to track anyway, since it's probably macro-internal `use`
1178                 if let Some(sub_span) = self.span.sub_span_of_star(item.span) {
1179                     if !self.span.filter_generated(item.span) {
1180                         let access = access_from!(self.save_ctxt, item, item.def_id);
1181                         let span = self.span_from_span(sub_span);
1182                         let parent =
1183                             self.save_ctxt.tcx.parent(item.def_id.to_def_id()).map(id_from_def_id);
1184                         self.dumper.import(
1185                             &access,
1186                             Import {
1187                                 kind: ImportKind::GlobUse,
1188                                 ref_id: None,
1189                                 span,
1190                                 alias_span: None,
1191                                 name: "*".to_owned(),
1192                                 value: names.join(", "),
1193                                 parent,
1194                             },
1195                         );
1196                         self.write_sub_paths(&path);
1197                     }
1198                 }
1199             }
1200             hir::ItemKind::ExternCrate(_) => {
1201                 let name_span = item.ident.span;
1202                 if !self.span.filter_generated(name_span) {
1203                     let span = self.span_from_span(name_span);
1204                     let parent =
1205                         self.save_ctxt.tcx.parent(item.def_id.to_def_id()).map(id_from_def_id);
1206                     self.dumper.import(
1207                         &Access { public: false, reachable: false },
1208                         Import {
1209                             kind: ImportKind::ExternCrate,
1210                             ref_id: None,
1211                             span,
1212                             alias_span: None,
1213                             name: item.ident.to_string(),
1214                             value: String::new(),
1215                             parent,
1216                         },
1217                     );
1218                 }
1219             }
1220             hir::ItemKind::Fn(ref sig, ref ty_params, body) => {
1221                 self.process_fn(item, sig.decl, &sig.header, ty_params, body)
1222             }
1223             hir::ItemKind::Static(ref typ, _, body) => {
1224                 let body = self.tcx.hir().body(body);
1225                 self.process_static_or_const_item(item, typ, &body.value)
1226             }
1227             hir::ItemKind::Const(ref typ, body) => {
1228                 let body = self.tcx.hir().body(body);
1229                 self.process_static_or_const_item(item, typ, &body.value)
1230             }
1231             hir::ItemKind::Struct(ref def, ref ty_params)
1232             | hir::ItemKind::Union(ref def, ref ty_params) => {
1233                 self.process_struct(item, def, ty_params)
1234             }
1235             hir::ItemKind::Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1236             hir::ItemKind::Impl(ref impl_) => self.process_impl(item, impl_),
1237             hir::ItemKind::Trait(_, _, ref generics, ref trait_refs, methods) => {
1238                 self.process_trait(item, generics, trait_refs, methods)
1239             }
1240             hir::ItemKind::Mod(ref m) => {
1241                 self.process_mod(item);
1242                 intravisit::walk_mod(self, m, item.hir_id());
1243             }
1244             hir::ItemKind::TyAlias(ty, ref generics) => {
1245                 let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
1246                 let value = ty_to_string(&ty);
1247                 if !self.span.filter_generated(item.ident.span) {
1248                     let span = self.span_from_span(item.ident.span);
1249                     let id = id_from_def_id(item.def_id.to_def_id());
1250                     let attrs = self.tcx.hir().attrs(item.hir_id());
1251
1252                     self.dumper.dump_def(
1253                         &access_from!(self.save_ctxt, item, item.def_id),
1254                         Def {
1255                             kind: DefKind::Type,
1256                             id,
1257                             span,
1258                             name: item.ident.to_string(),
1259                             qualname: qualname.clone(),
1260                             value,
1261                             parent: None,
1262                             children: vec![],
1263                             decl_id: None,
1264                             docs: self.save_ctxt.docs_for_attrs(attrs),
1265                             sig: sig::item_signature(item, &self.save_ctxt),
1266                             attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
1267                         },
1268                     );
1269                 }
1270
1271                 self.visit_ty(ty);
1272                 self.process_generic_params(generics, &qualname, item.hir_id());
1273             }
1274             _ => intravisit::walk_item(self, item),
1275         }
1276     }
1277
1278     fn visit_generics(&mut self, generics: &'tcx hir::Generics<'tcx>) {
1279         for param in generics.params {
1280             match param.kind {
1281                 hir::GenericParamKind::Lifetime { .. } => {}
1282                 hir::GenericParamKind::Type { ref default, .. } => {
1283                     self.process_bounds(param.bounds);
1284                     if let Some(ref ty) = default {
1285                         self.visit_ty(ty);
1286                     }
1287                 }
1288                 hir::GenericParamKind::Const { ref ty, ref default } => {
1289                     self.process_bounds(param.bounds);
1290                     self.visit_ty(ty);
1291                     if let Some(default) = default {
1292                         self.visit_anon_const(default);
1293                     }
1294                 }
1295             }
1296         }
1297         for pred in generics.where_clause.predicates {
1298             if let hir::WherePredicate::BoundPredicate(ref wbp) = *pred {
1299                 self.process_bounds(wbp.bounds);
1300                 self.visit_ty(wbp.bounded_ty);
1301             }
1302         }
1303     }
1304
1305     fn visit_ty(&mut self, t: &'tcx hir::Ty<'tcx>) {
1306         self.process_macro_use(t.span);
1307         match t.kind {
1308             hir::TyKind::Path(ref path) => {
1309                 if generated_code(t.span) {
1310                     return;
1311                 }
1312
1313                 if let Some(id) = self.lookup_def_id(t.hir_id) {
1314                     let sub_span = path.last_segment_span();
1315                     let span = self.span_from_span(sub_span);
1316                     self.dumper.dump_ref(Ref {
1317                         kind: RefKind::Type,
1318                         span,
1319                         ref_id: id_from_def_id(id),
1320                     });
1321                 }
1322
1323                 if let hir::QPath::Resolved(_, path) = path {
1324                     self.write_sub_paths_truncated(path);
1325                 }
1326                 intravisit::walk_qpath(self, path, t.hir_id, t.span);
1327             }
1328             hir::TyKind::Array(ref ty, ref length) => {
1329                 self.visit_ty(ty);
1330                 let map = self.tcx.hir();
1331                 match length {
1332                     // FIXME(generic_arg_infer): We probably want to
1333                     // output the inferred type here? :shrug:
1334                     hir::ArrayLen::Infer(..) => {}
1335                     hir::ArrayLen::Body(anon_const) => self
1336                         .nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
1337                             v.visit_expr(&map.body(anon_const.body).value)
1338                         }),
1339                 }
1340             }
1341             hir::TyKind::OpaqueDef(item_id, _) => {
1342                 let item = self.tcx.hir().item(item_id);
1343                 self.nest_typeck_results(item_id.def_id, |v| v.visit_item(item));
1344             }
1345             _ => intravisit::walk_ty(self, t),
1346         }
1347     }
1348
1349     fn visit_expr(&mut self, ex: &'tcx hir::Expr<'tcx>) {
1350         debug!("visit_expr {:?}", ex.kind);
1351         self.process_macro_use(ex.span);
1352         match ex.kind {
1353             hir::ExprKind::Struct(ref path, ref fields, ref rest) => {
1354                 let hir_expr = self.save_ctxt.tcx.hir().expect_expr(ex.hir_id);
1355                 let adt = match self.save_ctxt.typeck_results().expr_ty_opt(&hir_expr) {
1356                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1357                     _ => {
1358                         intravisit::walk_expr(self, ex);
1359                         return;
1360                     }
1361                 };
1362                 let res = self.save_ctxt.get_path_res(hir_expr.hir_id);
1363                 self.process_struct_lit(ex, path, fields, adt.variant_of_res(res), *rest)
1364             }
1365             hir::ExprKind::MethodCall(ref seg, args, _) => self.process_method_call(ex, seg, args),
1366             hir::ExprKind::Field(ref sub_ex, _) => {
1367                 self.visit_expr(&sub_ex);
1368
1369                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1370                     down_cast_data!(field_data, RefData, ex.span);
1371                     if !generated_code(ex.span) {
1372                         self.dumper.dump_ref(field_data);
1373                     }
1374                 }
1375             }
1376             hir::ExprKind::Closure(_, ref decl, body, _fn_decl_span, _) => {
1377                 let id = format!("${}", ex.hir_id);
1378
1379                 // walk arg and return types
1380                 for ty in decl.inputs {
1381                     self.visit_ty(ty);
1382                 }
1383
1384                 if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
1385                     self.visit_ty(ret_ty);
1386                 }
1387
1388                 // walk the body
1389                 let map = self.tcx.hir();
1390                 self.nest_typeck_results(self.tcx.hir().local_def_id(ex.hir_id), |v| {
1391                     let body = map.body(body);
1392                     v.process_formals(body.params, &id);
1393                     v.visit_expr(&body.value)
1394                 });
1395             }
1396             hir::ExprKind::Repeat(ref expr, ref length) => {
1397                 self.visit_expr(expr);
1398                 let map = self.tcx.hir();
1399                 match length {
1400                     // FIXME(generic_arg_infer): We probably want to
1401                     // output the inferred type here? :shrug:
1402                     hir::ArrayLen::Infer(..) => {}
1403                     hir::ArrayLen::Body(anon_const) => self
1404                         .nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
1405                             v.visit_expr(&map.body(anon_const.body).value)
1406                         }),
1407                 }
1408             }
1409             // In particular, we take this branch for call and path expressions,
1410             // where we'll index the idents involved just by continuing to walk.
1411             _ => intravisit::walk_expr(self, ex),
1412         }
1413     }
1414
1415     fn visit_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
1416         self.process_macro_use(p.span);
1417         self.process_pat(p);
1418     }
1419
1420     fn visit_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) {
1421         self.process_var_decl(&arm.pat);
1422         if let Some(hir::Guard::If(expr)) = &arm.guard {
1423             self.visit_expr(expr);
1424         }
1425         self.visit_expr(&arm.body);
1426     }
1427
1428     fn visit_qpath(&mut self, path: &'tcx hir::QPath<'tcx>, id: hir::HirId, _: Span) {
1429         self.process_path(id, path);
1430     }
1431
1432     fn visit_stmt(&mut self, s: &'tcx hir::Stmt<'tcx>) {
1433         self.process_macro_use(s.span);
1434         intravisit::walk_stmt(self, s)
1435     }
1436
1437     fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
1438         self.process_macro_use(l.span);
1439         self.process_var_decl(&l.pat);
1440
1441         // Just walk the initialiser and type (don't want to walk the pattern again).
1442         walk_list!(self, visit_ty, &l.ty);
1443         walk_list!(self, visit_expr, &l.init);
1444     }
1445
1446     fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem<'tcx>) {
1447         let access = access_from!(self.save_ctxt, item, item.def_id);
1448
1449         match item.kind {
1450             hir::ForeignItemKind::Fn(decl, _, ref generics) => {
1451                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1452                     down_cast_data!(fn_data, DefData, item.span);
1453
1454                     self.process_generic_params(generics, &fn_data.qualname, item.hir_id());
1455                     self.dumper.dump_def(&access, fn_data);
1456                 }
1457
1458                 for ty in decl.inputs {
1459                     self.visit_ty(ty);
1460                 }
1461
1462                 if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
1463                     self.visit_ty(ret_ty);
1464                 }
1465             }
1466             hir::ForeignItemKind::Static(ref ty, _) => {
1467                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1468                     down_cast_data!(var_data, DefData, item.span);
1469                     self.dumper.dump_def(&access, var_data);
1470                 }
1471
1472                 self.visit_ty(ty);
1473             }
1474             hir::ForeignItemKind::Type => {
1475                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1476                     down_cast_data!(var_data, DefData, item.span);
1477                     self.dumper.dump_def(&access, var_data);
1478                 }
1479             }
1480         }
1481     }
1482 }