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::map::Map;
  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 macro_rules! down_cast_data {
  51     ($id:ident, $kind:ident, $sp:expr) => {
  52         let $id = if let super::Data::$kind(data) = $id {
  53             data
  54         } else {
  55             span_bug!($sp, "unexpected data kind: {:?}", $id);
  56         };
  57     };
  58 }
  59
  60 macro_rules! access_from {
  61     ($save_ctxt:expr, $item:expr, $id:expr) => {
  62         Access {
  63             public: $item.vis.node.is_pub(),
  64             reachable: $save_ctxt.access_levels.is_reachable($id),
  65         }
  66     };
  67 }
  68
  69 macro_rules! access_from_vis {
  70     ($save_ctxt:expr, $vis:expr, $id:expr) => {
  71         Access { public: $vis.node.is_pub(), reachable: $save_ctxt.access_levels.is_reachable($id) }
  72     };
  73 }
  74
  75 pub struct DumpVisitor<'tcx> {
  76     pub save_ctxt: SaveContext<'tcx>,
  77     tcx: TyCtxt<'tcx>,
  78     dumper: Dumper,
  79
  80     span: SpanUtils<'tcx>,
  81     // Set of macro definition (callee) spans, and the set
  82     // of macro use (callsite) spans. We store these to ensure
  83     // we only write one macro def per unique macro definition, and
  84     // one macro use per unique callsite span.
  85     // mac_defs: FxHashSet<Span>,
  86     // macro_calls: FxHashSet<Span>,
  87 }
  88
  89 impl<'tcx> DumpVisitor<'tcx> {
  90     pub fn new(save_ctxt: SaveContext<'tcx>) -> DumpVisitor<'tcx> {
  91         let span_utils = SpanUtils::new(&save_ctxt.tcx.sess);
  92         let dumper = Dumper::new(save_ctxt.config.clone());
  93         DumpVisitor {
  94             tcx: save_ctxt.tcx,
  95             save_ctxt,
  96             dumper,
  97             span: span_utils,
  98             // mac_defs: FxHashSet::default(),
  99             // macro_calls: FxHashSet::default(),
 100         }
 101     }
 102
 103     pub fn analysis(&self) -> &rls_data::Analysis {
 104         self.dumper.analysis()
 105     }
 106
 107     fn nest_typeck_results<F>(&mut self, item_def_id: LocalDefId, f: F)
 108     where
 109         F: FnOnce(&mut Self),
 110     {
 111         let typeck_results = if self.tcx.has_typeck_results(item_def_id) {
 112             Some(self.tcx.typeck(item_def_id))
 113         } else {
 114             None
 115         };
 116
 117         let old_maybe_typeck_results = self.save_ctxt.maybe_typeck_results;
 118         self.save_ctxt.maybe_typeck_results = typeck_results;
 119         f(self);
 120         self.save_ctxt.maybe_typeck_results = old_maybe_typeck_results;
 121     }
 122
 123     fn span_from_span(&self, span: Span) -> SpanData {
 124         self.save_ctxt.span_from_span(span)
 125     }
 126
 127     fn lookup_def_id(&self, ref_id: hir::HirId) -> Option<DefId> {
 128         self.save_ctxt.lookup_def_id(ref_id)
 129     }
 130
 131     pub fn dump_crate_info(&mut self, name: &str) {
 132         let source_file = self.tcx.sess.local_crate_source_file.as_ref();
 133         let crate_root = source_file.map(|source_file| {
 134             let source_file = Path::new(source_file);
 135             match source_file.file_name() {
 136                 Some(_) => source_file.parent().unwrap().display(),
 137                 None => source_file.display(),
 138             }
 139             .to_string()
 140         });
 141
 142         let data = CratePreludeData {
 143             crate_id: GlobalCrateId {
 144                 name: name.into(),
 145                 disambiguator: (self.tcx.sess.local_stable_crate_id().to_u64(), 0),
 146             },
 147             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 148             external_crates: self.save_ctxt.get_external_crates(),
 149             span: self.span_from_span(self.tcx.def_span(CRATE_DEF_ID)),
 150         };
 151
 152         self.dumper.crate_prelude(data);
 153     }
 154
 155     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
 156         // Apply possible `remap-path-prefix` remapping to the input source file
 157         // (and don't include remapping args anymore)
 158         let (program, arguments) = {
 159             let remap_arg_indices = {
 160                 let mut indices = FxHashSet::default();
 161                 // Args are guaranteed to be valid UTF-8 (checked early)
 162                 for (i, e) in env::args().enumerate() {
 163                     if e.starts_with("--remap-path-prefix=") {
 164                         indices.insert(i);
 165                     } else if e == "--remap-path-prefix" {
 166                         indices.insert(i);
 167                         indices.insert(i + 1);
 168                     }
 169                 }
 170                 indices
 171             };
 172
 173             let mut args = env::args()
 174                 .enumerate()
 175                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 176                 .map(|(_, arg)| match input {
 177                     Input::File(ref path) if path == Path::new(&arg) => {
 178                         let mapped = &self.tcx.sess.local_crate_source_file;
 179                         mapped.as_ref().unwrap().to_string_lossy().into()
 180                     }
 181                     _ => arg,
 182                 });
 183
 184             (args.next().unwrap(), args.collect())
 185         };
 186
 187         let data = CompilationOptions {
 188             directory: self.tcx.sess.opts.working_dir.remapped_path_if_available().into(),
 189             program,
 190             arguments,
 191             output: self.save_ctxt.compilation_output(crate_name),
 192         };
 193
 194         self.dumper.compilation_opts(data);
 195     }
 196
 197     fn write_segments(&mut self, segments: impl IntoIterator<Item = &'tcx hir::PathSegment<'tcx>>) {
 198         for seg in segments {
 199             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 200                 self.dumper.dump_ref(data);
 201             }
 202         }
 203     }
 204
 205     fn write_sub_paths(&mut self, path: &'tcx hir::Path<'tcx>) {
 206         self.write_segments(path.segments)
 207     }
 208
 209     // As write_sub_paths, but does not process the last ident in the path (assuming it
 210     // will be processed elsewhere). See note on write_sub_paths about global.
 211     fn write_sub_paths_truncated(&mut self, path: &'tcx hir::Path<'tcx>) {
 212         if let [segments @ .., _] = path.segments {
 213             self.write_segments(segments)
 214         }
 215     }
 216
 217     fn process_formals(&mut self, formals: &'tcx [hir::Param<'tcx>], qualname: &str) {
 218         for arg in formals {
 219             self.visit_pat(&arg.pat);
 220             let mut collector = PathCollector::new(self.tcx);
 221             collector.visit_pat(&arg.pat);
 222
 223             for (hir_id, ident, ..) in collector.collected_idents {
 224                 let typ = match self.save_ctxt.typeck_results().node_type_opt(hir_id) {
 225                     Some(s) => s.to_string(),
 226                     None => continue,
 227                 };
 228                 if !self.span.filter_generated(ident.span) {
 229                     let id = id_from_hir_id(hir_id, &self.save_ctxt);
 230                     let span = self.span_from_span(ident.span);
 231
 232                     self.dumper.dump_def(
 233                         &Access { public: false, reachable: false },
 234                         Def {
 235                             kind: DefKind::Local,
 236                             id,
 237                             span,
 238                             name: ident.to_string(),
 239                             qualname: format!("{}::{}", qualname, ident),
 240                             value: typ,
 241                             parent: None,
 242                             children: vec![],
 243                             decl_id: None,
 244                             docs: String::new(),
 245                             sig: None,
 246                             attributes: vec![],
 247                         },
 248                     );
 249                 }
 250             }
 251         }
 252     }
 253
 254     fn process_method(
 255         &mut self,
 256         sig: &'tcx hir::FnSig<'tcx>,
 257         body: Option<hir::BodyId>,
 258         def_id: LocalDefId,
 259         ident: Ident,
 260         generics: &'tcx hir::Generics<'tcx>,
 261         vis: &hir::Visibility<'tcx>,
 262         span: Span,
 263     ) {
 264         debug!("process_method: {:?}:{}", def_id, ident);
 265
 266         let map = &self.tcx.hir();
 267         let hir_id = map.local_def_id_to_hir_id(def_id);
 268         self.nest_typeck_results(def_id, |v| {
 269             if let Some(mut method_data) = v.save_ctxt.get_method_data(hir_id, ident, span) {
 270                 if let Some(body) = body {
 271                     v.process_formals(map.body(body).params, &method_data.qualname);
 272                 }
 273                 v.process_generic_params(&generics, &method_data.qualname, hir_id);
 274
 275                 method_data.value =
 276                     fn_to_string(sig.decl, sig.header, Some(ident.name), generics, vis, &[], None);
 277                 method_data.sig = sig::method_signature(hir_id, ident, generics, sig, &v.save_ctxt);
 278
 279                 v.dumper.dump_def(&access_from_vis!(v.save_ctxt, vis, def_id), method_data);
 280             }
 281
 282             // walk arg and return types
 283             for arg in sig.decl.inputs {
 284                 v.visit_ty(arg);
 285             }
 286
 287             if let hir::FnRetTy::Return(ref ret_ty) = sig.decl.output {
 288                 v.visit_ty(ret_ty)
 289             }
 290
 291             // walk the fn body
 292             if let Some(body) = body {
 293                 v.visit_expr(&map.body(body).value);
 294             }
 295         });
 296     }
 297
 298     fn process_struct_field_def(
 299         &mut self,
 300         field: &'tcx hir::FieldDef<'tcx>,
 301         parent_id: hir::HirId,
 302     ) {
 303         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 304         if let Some(field_data) = field_data {
 305             self.dumper.dump_def(
 306                 &access_from!(self.save_ctxt, field, self.tcx.hir().local_def_id(field.hir_id)),
 307                 field_data,
 308             );
 309         }
 310     }
 311
 312     // Dump generic params bindings, then visit_generics
 313     fn process_generic_params(
 314         &mut self,
 315         generics: &'tcx hir::Generics<'tcx>,
 316         prefix: &str,
 317         id: hir::HirId,
 318     ) {
 319         for param in generics.params {
 320             match param.kind {
 321                 hir::GenericParamKind::Lifetime { .. } => {}
 322                 hir::GenericParamKind::Type { .. } => {
 323                     let param_ss = param.name.ident().span;
 324                     let name = escape(self.span.snippet(param_ss));
 325                     // Append $id to name to make sure each one is unique.
 326                     let qualname = format!("{}::{}${}", prefix, name, id);
 327                     if !self.span.filter_generated(param_ss) {
 328                         let id = id_from_hir_id(param.hir_id, &self.save_ctxt);
 329                         let span = self.span_from_span(param_ss);
 330
 331                         self.dumper.dump_def(
 332                             &Access { public: false, reachable: false },
 333                             Def {
 334                                 kind: DefKind::Type,
 335                                 id,
 336                                 span,
 337                                 name,
 338                                 qualname,
 339                                 value: String::new(),
 340                                 parent: None,
 341                                 children: vec![],
 342                                 decl_id: None,
 343                                 docs: String::new(),
 344                                 sig: None,
 345                                 attributes: vec![],
 346                             },
 347                         );
 348                     }
 349                 }
 350                 hir::GenericParamKind::Const { .. } => {}
 351             }
 352         }
 353
 354         self.visit_generics(generics)
 355     }
 356
 357     fn process_fn(
 358         &mut self,
 359         item: &'tcx hir::Item<'tcx>,
 360         decl: &'tcx hir::FnDecl<'tcx>,
 361         _header: &'tcx hir::FnHeader,
 362         ty_params: &'tcx hir::Generics<'tcx>,
 363         body: hir::BodyId,
 364     ) {
 365         let map = &self.tcx.hir();
 366         self.nest_typeck_results(item.def_id, |v| {
 367             let body = map.body(body);
 368             if let Some(fn_data) = v.save_ctxt.get_item_data(item) {
 369                 down_cast_data!(fn_data, DefData, item.span);
 370                 v.process_formals(body.params, &fn_data.qualname);
 371                 v.process_generic_params(ty_params, &fn_data.qualname, item.hir_id());
 372
 373                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, item.def_id), fn_data);
 374             }
 375
 376             for arg in decl.inputs {
 377                 v.visit_ty(arg)
 378             }
 379
 380             if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
 381                 v.visit_ty(ret_ty)
 382             }
 383
 384             v.visit_expr(&body.value);
 385         });
 386     }
 387
 388     fn process_static_or_const_item(
 389         &mut self,
 390         item: &'tcx hir::Item<'tcx>,
 391         typ: &'tcx hir::Ty<'tcx>,
 392         expr: &'tcx hir::Expr<'tcx>,
 393     ) {
 394         self.nest_typeck_results(item.def_id, |v| {
 395             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 396                 down_cast_data!(var_data, DefData, item.span);
 397                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, item.def_id), var_data);
 398             }
 399             v.visit_ty(&typ);
 400             v.visit_expr(expr);
 401         });
 402     }
 403
 404     fn process_assoc_const(
 405         &mut self,
 406         def_id: LocalDefId,
 407         ident: Ident,
 408         typ: &'tcx hir::Ty<'tcx>,
 409         expr: Option<&'tcx hir::Expr<'tcx>>,
 410         parent_id: DefId,
 411         vis: &hir::Visibility<'tcx>,
 412         attrs: &'tcx [ast::Attribute],
 413     ) {
 414         let qualname = format!("::{}", self.tcx.def_path_str(def_id.to_def_id()));
 415
 416         if !self.span.filter_generated(ident.span) {
 417             let hir_id = self.tcx.hir().local_def_id_to_hir_id(def_id);
 418             let sig = sig::assoc_const_signature(hir_id, ident.name, typ, expr, &self.save_ctxt);
 419             let span = self.span_from_span(ident.span);
 420
 421             self.dumper.dump_def(
 422                 &access_from_vis!(self.save_ctxt, vis, def_id),
 423                 Def {
 424                     kind: DefKind::Const,
 425                     id: id_from_hir_id(hir_id, &self.save_ctxt),
 426                     span,
 427                     name: ident.name.to_string(),
 428                     qualname,
 429                     value: ty_to_string(&typ),
 430                     parent: Some(id_from_def_id(parent_id)),
 431                     children: vec![],
 432                     decl_id: None,
 433                     docs: self.save_ctxt.docs_for_attrs(attrs),
 434                     sig,
 435                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 436                 },
 437             );
 438         }
 439
 440         // walk type and init value
 441         self.nest_typeck_results(def_id, |v| {
 442             v.visit_ty(typ);
 443             if let Some(expr) = expr {
 444                 v.visit_expr(expr);
 445             }
 446         });
 447     }
 448
 449     // FIXME tuple structs should generate tuple-specific data.
 450     fn process_struct(
 451         &mut self,
 452         item: &'tcx hir::Item<'tcx>,
 453         def: &'tcx hir::VariantData<'tcx>,
 454         ty_params: &'tcx hir::Generics<'tcx>,
 455     ) {
 456         debug!("process_struct {:?} {:?}", item, item.span);
 457         let name = item.ident.to_string();
 458         let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
 459
 460         let kind = match item.kind {
 461             hir::ItemKind::Struct(_, _) => DefKind::Struct,
 462             hir::ItemKind::Union(_, _) => DefKind::Union,
 463             _ => unreachable!(),
 464         };
 465
 466         let (value, fields) = match item.kind {
 467             hir::ItemKind::Struct(hir::VariantData::Struct(ref fields, ..), ..)
 468             | hir::ItemKind::Union(hir::VariantData::Struct(ref fields, ..), ..) => {
 469                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 470                 let fields_str = fields
 471                     .iter()
 472                     .filter_map(|f| {
 473                         if include_priv_fields || f.vis.node.is_pub() {
 474                             Some(f.ident.to_string())
 475                         } else {
 476                             None
 477                         }
 478                     })
 479                     .collect::<Vec<_>>()
 480                     .join(", ");
 481                 let value = format!("{} {{ {} }}", name, fields_str);
 482                 (value, fields.iter().map(|f| id_from_hir_id(f.hir_id, &self.save_ctxt)).collect())
 483             }
 484             _ => (String::new(), vec![]),
 485         };
 486
 487         if !self.span.filter_generated(item.ident.span) {
 488             let span = self.span_from_span(item.ident.span);
 489             let attrs = self.tcx.hir().attrs(item.hir_id());
 490             self.dumper.dump_def(
 491                 &access_from!(self.save_ctxt, item, item.def_id),
 492                 Def {
 493                     kind,
 494                     id: id_from_def_id(item.def_id.to_def_id()),
 495                     span,
 496                     name,
 497                     qualname: qualname.clone(),
 498                     value,
 499                     parent: None,
 500                     children: fields,
 501                     decl_id: None,
 502                     docs: self.save_ctxt.docs_for_attrs(attrs),
 503                     sig: sig::item_signature(item, &self.save_ctxt),
 504                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 505                 },
 506             );
 507         }
 508
 509         self.nest_typeck_results(item.def_id, |v| {
 510             for field in def.fields() {
 511                 v.process_struct_field_def(field, item.hir_id());
 512                 v.visit_ty(&field.ty);
 513             }
 514
 515             v.process_generic_params(ty_params, &qualname, item.hir_id());
 516         });
 517     }
 518
 519     fn process_enum(
 520         &mut self,
 521         item: &'tcx hir::Item<'tcx>,
 522         enum_definition: &'tcx hir::EnumDef<'tcx>,
 523         ty_params: &'tcx hir::Generics<'tcx>,
 524     ) {
 525         let enum_data = self.save_ctxt.get_item_data(item);
 526         let enum_data = match enum_data {
 527             None => return,
 528             Some(data) => data,
 529         };
 530         down_cast_data!(enum_data, DefData, item.span);
 531
 532         let access = access_from!(self.save_ctxt, item, item.def_id);
 533
 534         for variant in enum_definition.variants {
 535             let name = variant.ident.name.to_string();
 536             let qualname = format!("{}::{}", enum_data.qualname, name);
 537             let name_span = variant.ident.span;
 538
 539             match variant.data {
 540                 hir::VariantData::Struct(ref fields, ..) => {
 541                     let fields_str =
 542                         fields.iter().map(|f| f.ident.to_string()).collect::<Vec<_>>().join(", ");
 543                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 544                     if !self.span.filter_generated(name_span) {
 545                         let span = self.span_from_span(name_span);
 546                         let id = id_from_hir_id(variant.id, &self.save_ctxt);
 547                         let parent = Some(id_from_def_id(item.def_id.to_def_id()));
 548                         let attrs = self.tcx.hir().attrs(variant.id);
 549
 550                         self.dumper.dump_def(
 551                             &access,
 552                             Def {
 553                                 kind: DefKind::StructVariant,
 554                                 id,
 555                                 span,
 556                                 name,
 557                                 qualname,
 558                                 value,
 559                                 parent,
 560                                 children: vec![],
 561                                 decl_id: None,
 562                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 563                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 564                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 565                             },
 566                         );
 567                     }
 568                 }
 569                 ref v => {
 570                     let mut value = format!("{}::{}", enum_data.name, name);
 571                     if let hir::VariantData::Tuple(fields, _) = v {
 572                         value.push('(');
 573                         value.push_str(
 574                             &fields
 575                                 .iter()
 576                                 .map(|f| ty_to_string(&f.ty))
 577                                 .collect::<Vec<_>>()
 578                                 .join(", "),
 579                         );
 580                         value.push(')');
 581                     }
 582                     if !self.span.filter_generated(name_span) {
 583                         let span = self.span_from_span(name_span);
 584                         let id = id_from_hir_id(variant.id, &self.save_ctxt);
 585                         let parent = Some(id_from_def_id(item.def_id.to_def_id()));
 586                         let attrs = self.tcx.hir().attrs(variant.id);
 587
 588                         self.dumper.dump_def(
 589                             &access,
 590                             Def {
 591                                 kind: DefKind::TupleVariant,
 592                                 id,
 593                                 span,
 594                                 name,
 595                                 qualname,
 596                                 value,
 597                                 parent,
 598                                 children: vec![],
 599                                 decl_id: None,
 600                                 docs: self.save_ctxt.docs_for_attrs(attrs),
 601                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 602                                 attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 603                             },
 604                         );
 605                     }
 606                 }
 607             }
 608
 609             for field in variant.data.fields() {
 610                 self.process_struct_field_def(field, variant.id);
 611                 self.visit_ty(field.ty);
 612             }
 613         }
 614         self.process_generic_params(ty_params, &enum_data.qualname, item.hir_id());
 615         self.dumper.dump_def(&access, enum_data);
 616     }
 617
 618     fn process_impl(&mut self, item: &'tcx hir::Item<'tcx>, impl_: &'tcx hir::Impl<'tcx>) {
 619         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 620             if !self.span.filter_generated(item.span) {
 621                 if let super::Data::RelationData(rel, imp) = impl_data {
 622                     self.dumper.dump_relation(rel);
 623                     self.dumper.dump_impl(imp);
 624                 } else {
 625                     span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 626                 }
 627             }
 628         }
 629
 630         let map = &self.tcx.hir();
 631         self.nest_typeck_results(item.def_id, |v| {
 632             v.visit_ty(&impl_.self_ty);
 633             if let Some(trait_ref) = &impl_.of_trait {
 634                 v.process_path(trait_ref.hir_ref_id, &hir::QPath::Resolved(None, &trait_ref.path));
 635             }
 636             v.process_generic_params(&impl_.generics, "", item.hir_id());
 637             for impl_item in impl_.items {
 638                 v.process_impl_item(map.impl_item(impl_item.id), item.def_id.to_def_id());
 639             }
 640         });
 641     }
 642
 643     fn process_trait(
 644         &mut self,
 645         item: &'tcx hir::Item<'tcx>,
 646         generics: &'tcx hir::Generics<'tcx>,
 647         trait_refs: hir::GenericBounds<'tcx>,
 648         methods: &'tcx [hir::TraitItemRef],
 649     ) {
 650         let name = item.ident.to_string();
 651         let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
 652         let mut val = name.clone();
 653         if !generics.params.is_empty() {
 654             val.push_str(&generic_params_to_string(generics.params));
 655         }
 656         if !trait_refs.is_empty() {
 657             val.push_str(": ");
 658             val.push_str(&bounds_to_string(trait_refs));
 659         }
 660         if !self.span.filter_generated(item.ident.span) {
 661             let id = id_from_def_id(item.def_id.to_def_id());
 662             let span = self.span_from_span(item.ident.span);
 663             let children =
 664                 methods.iter().map(|i| id_from_def_id(i.id.def_id.to_def_id())).collect();
 665             let attrs = self.tcx.hir().attrs(item.hir_id());
 666             self.dumper.dump_def(
 667                 &access_from!(self.save_ctxt, item, item.def_id),
 668                 Def {
 669                     kind: DefKind::Trait,
 670                     id,
 671                     span,
 672                     name,
 673                     qualname: qualname.clone(),
 674                     value: val,
 675                     parent: None,
 676                     children,
 677                     decl_id: None,
 678                     docs: self.save_ctxt.docs_for_attrs(attrs),
 679                     sig: sig::item_signature(item, &self.save_ctxt),
 680                     attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
 681                 },
 682             );
 683         }
 684
 685         // supertraits
 686         for super_bound in trait_refs.iter() {
 687             let (def_id, sub_span) = match *super_bound {
 688                 hir::GenericBound::Trait(ref trait_ref, _) => (
 689                     self.lookup_def_id(trait_ref.trait_ref.hir_ref_id),
 690                     trait_ref.trait_ref.path.segments.last().unwrap().ident.span,
 691                 ),
 692                 hir::GenericBound::LangItemTrait(lang_item, span, _, _) => {
 693                     (Some(self.tcx.require_lang_item(lang_item, Some(span))), span)
 694                 }
 695                 hir::GenericBound::Outlives(..) => continue,
 696             };
 697
 698             if let Some(id) = def_id {
 699                 if !self.span.filter_generated(sub_span) {
 700                     let span = self.span_from_span(sub_span);
 701                     self.dumper.dump_ref(Ref {
 702                         kind: RefKind::Type,
 703                         span: span.clone(),
 704                         ref_id: id_from_def_id(id),
 705                     });
 706
 707                     self.dumper.dump_relation(Relation {
 708                         kind: RelationKind::SuperTrait,
 709                         span,
 710                         from: id_from_def_id(id),
 711                         to: id_from_def_id(item.def_id.to_def_id()),
 712                     });
 713                 }
 714             }
 715         }
 716
 717         // walk generics and methods
 718         self.process_generic_params(generics, &qualname, item.hir_id());
 719         for method in methods {
 720             let map = &self.tcx.hir();
 721             self.process_trait_item(map.trait_item(method.id), item.def_id.to_def_id())
 722         }
 723     }
 724
 725     // `item` is the module in question, represented as an( item.
 726     fn process_mod(&mut self, item: &'tcx hir::Item<'tcx>) {
 727         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 728             down_cast_data!(mod_data, DefData, item.span);
 729             self.dumper.dump_def(&access_from!(self.save_ctxt, item, item.def_id), mod_data);
 730         }
 731     }
 732
 733     fn dump_path_ref(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 734         let path_data = self.save_ctxt.get_path_data(id, path);
 735         if let Some(path_data) = path_data {
 736             self.dumper.dump_ref(path_data);
 737         }
 738     }
 739
 740     fn dump_path_segment_ref(&mut self, id: hir::HirId, segment: &hir::PathSegment<'tcx>) {
 741         let segment_data = self.save_ctxt.get_path_segment_data_with_id(segment, id);
 742         if let Some(segment_data) = segment_data {
 743             self.dumper.dump_ref(segment_data);
 744         }
 745     }
 746
 747     fn process_path(&mut self, id: hir::HirId, path: &hir::QPath<'tcx>) {
 748         if self.span.filter_generated(path.span()) {
 749             return;
 750         }
 751         self.dump_path_ref(id, path);
 752
 753         // Type arguments
 754         let segments = match path {
 755             hir::QPath::Resolved(ty, path) => {
 756                 if let Some(ty) = ty {
 757                     self.visit_ty(ty);
 758                 }
 759                 path.segments
 760             }
 761             hir::QPath::TypeRelative(ty, segment) => {
 762                 self.visit_ty(ty);
 763                 std::slice::from_ref(*segment)
 764             }
 765             hir::QPath::LangItem(..) => return,
 766         };
 767         for seg in segments {
 768             if let Some(ref generic_args) = seg.args {
 769                 for arg in generic_args.args {
 770                     if let hir::GenericArg::Type(ref ty) = arg {
 771                         self.visit_ty(ty);
 772                     }
 773                 }
 774             }
 775         }
 776
 777         if let hir::QPath::Resolved(_, path) = path {
 778             self.write_sub_paths_truncated(path);
 779         }
 780     }
 781
 782     fn process_struct_lit(
 783         &mut self,
 784         ex: &'tcx hir::Expr<'tcx>,
 785         path: &'tcx hir::QPath<'tcx>,
 786         fields: &'tcx [hir::ExprField<'tcx>],
 787         variant: &'tcx ty::VariantDef,
 788         rest: Option<&'tcx hir::Expr<'tcx>>,
 789     ) {
 790         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 791             if let hir::QPath::Resolved(_, path) = path {
 792                 self.write_sub_paths_truncated(path);
 793             }
 794             down_cast_data!(struct_lit_data, RefData, ex.span);
 795             if !generated_code(ex.span) {
 796                 self.dumper.dump_ref(struct_lit_data);
 797             }
 798
 799             for field in fields {
 800                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 801                     self.dumper.dump_ref(field_data);
 802                 }
 803
 804                 self.visit_expr(&field.expr)
 805             }
 806         }
 807
 808         if let Some(base) = rest {
 809             self.visit_expr(&base);
 810         }
 811     }
 812
 813     fn process_method_call(
 814         &mut self,
 815         ex: &'tcx hir::Expr<'tcx>,
 816         seg: &'tcx hir::PathSegment<'tcx>,
 817         args: &'tcx [hir::Expr<'tcx>],
 818     ) {
 819         debug!("process_method_call {:?} {:?}", ex, ex.span);
 820         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 821             down_cast_data!(mcd, RefData, ex.span);
 822             if !generated_code(ex.span) {
 823                 self.dumper.dump_ref(mcd);
 824             }
 825         }
 826
 827         // Explicit types in the turbo-fish.
 828         if let Some(generic_args) = seg.args {
 829             for arg in generic_args.args {
 830                 if let hir::GenericArg::Type(ty) = arg {
 831                     self.visit_ty(&ty)
 832                 };
 833             }
 834         }
 835
 836         // walk receiver and args
 837         walk_list!(self, visit_expr, args);
 838     }
 839
 840     fn process_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
 841         match p.kind {
 842             hir::PatKind::Struct(ref _path, fields, _) => {
 843                 // FIXME do something with _path?
 844                 let adt = match self.save_ctxt.typeck_results().node_type_opt(p.hir_id) {
 845                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
 846                     _ => {
 847                         intravisit::walk_pat(self, p);
 848                         return;
 849                     }
 850                 };
 851                 let variant = adt.variant_of_res(self.save_ctxt.get_path_res(p.hir_id));
 852
 853                 for field in fields {
 854                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 855                         if !self.span.filter_generated(field.ident.span) {
 856                             let span = self.span_from_span(field.ident.span);
 857                             self.dumper.dump_ref(Ref {
 858                                 kind: RefKind::Variable,
 859                                 span,
 860                                 ref_id: id_from_def_id(variant.fields[index].did),
 861                             });
 862                         }
 863                     }
 864                     self.visit_pat(&field.pat);
 865                 }
 866             }
 867             _ => intravisit::walk_pat(self, p),
 868         }
 869     }
 870
 871     fn process_var_decl(&mut self, pat: &'tcx hir::Pat<'tcx>) {
 872         // The pattern could declare multiple new vars,
 873         // we must walk the pattern and collect them all.
 874         let mut collector = PathCollector::new(self.tcx);
 875         collector.visit_pat(&pat);
 876         self.visit_pat(&pat);
 877
 878         // Process collected paths.
 879         for (id, ident, _) in collector.collected_idents {
 880             let res = self.save_ctxt.get_path_res(id);
 881             match res {
 882                 Res::Local(hir_id) => {
 883                     let typ = self
 884                         .save_ctxt
 885                         .typeck_results()
 886                         .node_type_opt(hir_id)
 887                         .map(|t| t.to_string())
 888                         .unwrap_or_default();
 889
 890                     // Rust uses the id of the pattern for var lookups, so we'll use it too.
 891                     if !self.span.filter_generated(ident.span) {
 892                         let qualname = format!("{}${}", ident, hir_id);
 893                         let id = id_from_hir_id(hir_id, &self.save_ctxt);
 894                         let span = self.span_from_span(ident.span);
 895
 896                         self.dumper.dump_def(
 897                             &Access { public: false, reachable: false },
 898                             Def {
 899                                 kind: DefKind::Local,
 900                                 id,
 901                                 span,
 902                                 name: ident.to_string(),
 903                                 qualname,
 904                                 value: typ,
 905                                 parent: None,
 906                                 children: vec![],
 907                                 decl_id: None,
 908                                 docs: String::new(),
 909                                 sig: None,
 910                                 attributes: vec![],
 911                             },
 912                         );
 913                     }
 914                 }
 915                 Res::Def(
 916                     HirDefKind::Ctor(..)
 917                     | HirDefKind::Const
 918                     | HirDefKind::AssocConst
 919                     | HirDefKind::Struct
 920                     | HirDefKind::Variant
 921                     | HirDefKind::TyAlias
 922                     | HirDefKind::AssocTy,
 923                     _,
 924                 )
 925                 | Res::SelfTy(..) => {
 926                     self.dump_path_segment_ref(id, &hir::PathSegment::from_ident(ident));
 927                 }
 928                 def => {
 929                     error!("unexpected definition kind when processing collected idents: {:?}", def)
 930                 }
 931             }
 932         }
 933
 934         for (id, ref path) in collector.collected_paths {
 935             self.process_path(id, path);
 936         }
 937     }
 938
 939     /// Extracts macro use and definition information from the AST node defined
 940     /// by the given NodeId, using the expansion information from the node's
 941     /// span.
 942     ///
 943     /// If the span is not macro-generated, do nothing, else use callee and
 944     /// callsite spans to record macro definition and use data, using the
 945     /// mac_uses and mac_defs sets to prevent multiples.
 946     fn process_macro_use(&mut self, _span: Span) {
 947         // FIXME if we're not dumping the defs (see below), there is no point
 948         // dumping refs either.
 949         // let source_span = span.source_callsite();
 950         // if !self.macro_calls.insert(source_span) {
 951         //     return;
 952         // }
 953
 954         // let data = match self.save_ctxt.get_macro_use_data(span) {
 955         //     None => return,
 956         //     Some(data) => data,
 957         // };
 958
 959         // self.dumper.macro_use(data);
 960
 961         // FIXME write the macro def
 962         // let mut hasher = DefaultHasher::new();
 963         // data.callee_span.hash(&mut hasher);
 964         // let hash = hasher.finish();
 965         // let qualname = format!("{}::{}", data.name, hash);
 966         // Don't write macro definition for imported macros
 967         // if !self.mac_defs.contains(&data.callee_span)
 968         //     && !data.imported {
 969         //     self.mac_defs.insert(data.callee_span);
 970         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
 971         //         self.dumper.macro_data(MacroData {
 972         //             span: sub_span,
 973         //             name: data.name.clone(),
 974         //             qualname: qualname.clone(),
 975         //             // FIXME where do macro docs come from?
 976         //             docs: String::new(),
 977         //         }.lower(self.tcx));
 978         //     }
 979         // }
 980     }
 981
 982     fn process_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>, trait_id: DefId) {
 983         self.process_macro_use(trait_item.span);
 984         let vis_span = trait_item.span.shrink_to_lo();
 985         match trait_item.kind {
 986             hir::TraitItemKind::Const(ref ty, body) => {
 987                 let body = body.map(|b| &self.tcx.hir().body(b).value);
 988                 let respan = respan(vis_span, hir::VisibilityKind::Public);
 989                 let attrs = self.tcx.hir().attrs(trait_item.hir_id());
 990                 self.process_assoc_const(
 991                     trait_item.def_id,
 992                     trait_item.ident,
 993                     &ty,
 994                     body,
 995                     trait_id,
 996                     &respan,
 997                     attrs,
 998                 );
 999             }
1000             hir::TraitItemKind::Fn(ref sig, ref trait_fn) => {
1001                 let body =
1002                     if let hir::TraitFn::Provided(body) = trait_fn { Some(*body) } else { None };
1003                 let respan = respan(vis_span, hir::VisibilityKind::Public);
1004                 self.process_method(
1005                     sig,
1006                     body,
1007                     trait_item.def_id,
1008                     trait_item.ident,
1009                     &trait_item.generics,
1010                     &respan,
1011                     trait_item.span,
1012                 );
1013             }
1014             hir::TraitItemKind::Type(ref bounds, ref default_ty) => {
1015                 // FIXME do something with _bounds (for type refs)
1016                 let name = trait_item.ident.name.to_string();
1017                 let qualname =
1018                     format!("::{}", self.tcx.def_path_str(trait_item.def_id.to_def_id()));
1019
1020                 if !self.span.filter_generated(trait_item.ident.span) {
1021                     let span = self.span_from_span(trait_item.ident.span);
1022                     let id = id_from_def_id(trait_item.def_id.to_def_id());
1023                     let attrs = self.tcx.hir().attrs(trait_item.hir_id());
1024
1025                     self.dumper.dump_def(
1026                         &Access { public: true, reachable: true },
1027                         Def {
1028                             kind: DefKind::Type,
1029                             id,
1030                             span,
1031                             name,
1032                             qualname,
1033                             value: self.span.snippet(trait_item.span),
1034                             parent: Some(id_from_def_id(trait_id)),
1035                             children: vec![],
1036                             decl_id: None,
1037                             docs: self.save_ctxt.docs_for_attrs(attrs),
1038                             sig: sig::assoc_type_signature(
1039                                 trait_item.hir_id(),
1040                                 trait_item.ident,
1041                                 Some(bounds),
1042                                 default_ty.as_ref().map(|ty| &**ty),
1043                                 &self.save_ctxt,
1044                             ),
1045                             attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
1046                         },
1047                     );
1048                 }
1049
1050                 if let Some(default_ty) = default_ty {
1051                     self.visit_ty(default_ty)
1052                 }
1053             }
1054         }
1055     }
1056
1057     fn process_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>, impl_id: DefId) {
1058         self.process_macro_use(impl_item.span);
1059         match impl_item.kind {
1060             hir::ImplItemKind::Const(ref ty, body) => {
1061                 let body = self.tcx.hir().body(body);
1062                 let attrs = self.tcx.hir().attrs(impl_item.hir_id());
1063                 self.process_assoc_const(
1064                     impl_item.def_id,
1065                     impl_item.ident,
1066                     &ty,
1067                     Some(&body.value),
1068                     impl_id,
1069                     &impl_item.vis,
1070                     attrs,
1071                 );
1072             }
1073             hir::ImplItemKind::Fn(ref sig, body) => {
1074                 self.process_method(
1075                     sig,
1076                     Some(body),
1077                     impl_item.def_id,
1078                     impl_item.ident,
1079                     &impl_item.generics,
1080                     &impl_item.vis,
1081                     impl_item.span,
1082                 );
1083             }
1084             hir::ImplItemKind::TyAlias(ref ty) => {
1085                 // FIXME: uses of the assoc type should ideally point to this
1086                 // 'def' and the name here should be a ref to the def in the
1087                 // trait.
1088                 self.visit_ty(ty)
1089             }
1090         }
1091     }
1092
1093     pub(crate) fn process_crate(&mut self) {
1094         let id = hir::CRATE_HIR_ID;
1095         let qualname =
1096             format!("::{}", self.tcx.def_path_str(self.tcx.hir().local_def_id(id).to_def_id()));
1097
1098         let sm = self.tcx.sess.source_map();
1099         let krate_mod = self.tcx.hir().root_module();
1100         let filename = sm.span_to_filename(krate_mod.inner);
1101         let data_id = id_from_hir_id(id, &self.save_ctxt);
1102         let children =
1103             krate_mod.item_ids.iter().map(|i| id_from_def_id(i.def_id.to_def_id())).collect();
1104         let span = self.span_from_span(krate_mod.inner);
1105         let attrs = self.tcx.hir().attrs(id);
1106
1107         self.dumper.dump_def(
1108             &Access { public: true, reachable: true },
1109             Def {
1110                 kind: DefKind::Mod,
1111                 id: data_id,
1112                 name: String::new(),
1113                 qualname,
1114                 span,
1115                 value: filename.prefer_remapped().to_string(),
1116                 children,
1117                 parent: None,
1118                 decl_id: None,
1119                 docs: self.save_ctxt.docs_for_attrs(attrs),
1120                 sig: None,
1121                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1122             },
1123         );
1124         self.tcx.hir().walk_toplevel_module(self);
1125     }
1126
1127     fn process_bounds(&mut self, bounds: hir::GenericBounds<'tcx>) {
1128         for bound in bounds {
1129             if let hir::GenericBound::Trait(ref trait_ref, _) = *bound {
1130                 self.process_path(
1131                     trait_ref.trait_ref.hir_ref_id,
1132                     &hir::QPath::Resolved(None, &trait_ref.trait_ref.path),
1133                 )
1134             }
1135         }
1136     }
1137 }
1138
1139 impl<'tcx> Visitor<'tcx> for DumpVisitor<'tcx> {
1140     type Map = Map<'tcx>;
1141
1142     fn nested_visit_map(&mut self) -> intravisit::NestedVisitorMap<Self::Map> {
1143         intravisit::NestedVisitorMap::All(self.tcx.hir())
1144     }
1145
1146     fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
1147         self.process_macro_use(item.span);
1148         match item.kind {
1149             hir::ItemKind::Use(path, hir::UseKind::Single) => {
1150                 let sub_span = path.segments.last().unwrap().ident.span;
1151                 if !self.span.filter_generated(sub_span) {
1152                     let access = access_from!(self.save_ctxt, item, item.def_id);
1153                     let ref_id = self.lookup_def_id(item.hir_id()).map(id_from_def_id);
1154                     let span = self.span_from_span(sub_span);
1155                     let parent =
1156                         self.save_ctxt.tcx.parent(item.def_id.to_def_id()).map(id_from_def_id);
1157                     self.dumper.import(
1158                         &access,
1159                         Import {
1160                             kind: ImportKind::Use,
1161                             ref_id,
1162                             span,
1163                             alias_span: None,
1164                             name: item.ident.to_string(),
1165                             value: String::new(),
1166                             parent,
1167                         },
1168                     );
1169                     self.write_sub_paths_truncated(&path);
1170                 }
1171             }
1172             hir::ItemKind::Use(path, hir::UseKind::Glob) => {
1173                 // Make a comma-separated list of names of imported modules.
1174                 let names = self.tcx.names_imported_by_glob_use(item.def_id);
1175                 let names: Vec<_> = names.iter().map(|n| n.to_string()).collect();
1176
1177                 // Otherwise it's a span with wrong macro expansion info, which
1178                 // we don't want to track anyway, since it's probably macro-internal `use`
1179                 if let Some(sub_span) = self.span.sub_span_of_star(item.span) {
1180                     if !self.span.filter_generated(item.span) {
1181                         let access = access_from!(self.save_ctxt, item, item.def_id);
1182                         let span = self.span_from_span(sub_span);
1183                         let parent =
1184                             self.save_ctxt.tcx.parent(item.def_id.to_def_id()).map(id_from_def_id);
1185                         self.dumper.import(
1186                             &access,
1187                             Import {
1188                                 kind: ImportKind::GlobUse,
1189                                 ref_id: None,
1190                                 span,
1191                                 alias_span: None,
1192                                 name: "*".to_owned(),
1193                                 value: names.join(", "),
1194                                 parent,
1195                             },
1196                         );
1197                         self.write_sub_paths(&path);
1198                     }
1199                 }
1200             }
1201             hir::ItemKind::ExternCrate(_) => {
1202                 let name_span = item.ident.span;
1203                 if !self.span.filter_generated(name_span) {
1204                     let span = self.span_from_span(name_span);
1205                     let parent =
1206                         self.save_ctxt.tcx.parent(item.def_id.to_def_id()).map(id_from_def_id);
1207                     self.dumper.import(
1208                         &Access { public: false, reachable: false },
1209                         Import {
1210                             kind: ImportKind::ExternCrate,
1211                             ref_id: None,
1212                             span,
1213                             alias_span: None,
1214                             name: item.ident.to_string(),
1215                             value: String::new(),
1216                             parent,
1217                         },
1218                     );
1219                 }
1220             }
1221             hir::ItemKind::Fn(ref sig, ref ty_params, body) => {
1222                 self.process_fn(item, sig.decl, &sig.header, ty_params, body)
1223             }
1224             hir::ItemKind::Static(ref typ, _, body) => {
1225                 let body = self.tcx.hir().body(body);
1226                 self.process_static_or_const_item(item, typ, &body.value)
1227             }
1228             hir::ItemKind::Const(ref typ, body) => {
1229                 let body = self.tcx.hir().body(body);
1230                 self.process_static_or_const_item(item, typ, &body.value)
1231             }
1232             hir::ItemKind::Struct(ref def, ref ty_params)
1233             | hir::ItemKind::Union(ref def, ref ty_params) => {
1234                 self.process_struct(item, def, ty_params)
1235             }
1236             hir::ItemKind::Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1237             hir::ItemKind::Impl(ref impl_) => self.process_impl(item, impl_),
1238             hir::ItemKind::Trait(_, _, ref generics, ref trait_refs, methods) => {
1239                 self.process_trait(item, generics, trait_refs, methods)
1240             }
1241             hir::ItemKind::Mod(ref m) => {
1242                 self.process_mod(item);
1243                 intravisit::walk_mod(self, m, item.hir_id());
1244             }
1245             hir::ItemKind::TyAlias(ty, ref generics) => {
1246                 let qualname = format!("::{}", self.tcx.def_path_str(item.def_id.to_def_id()));
1247                 let value = ty_to_string(&ty);
1248                 if !self.span.filter_generated(item.ident.span) {
1249                     let span = self.span_from_span(item.ident.span);
1250                     let id = id_from_def_id(item.def_id.to_def_id());
1251                     let attrs = self.tcx.hir().attrs(item.hir_id());
1252
1253                     self.dumper.dump_def(
1254                         &access_from!(self.save_ctxt, item, item.def_id),
1255                         Def {
1256                             kind: DefKind::Type,
1257                             id,
1258                             span,
1259                             name: item.ident.to_string(),
1260                             qualname: qualname.clone(),
1261                             value,
1262                             parent: None,
1263                             children: vec![],
1264                             decl_id: None,
1265                             docs: self.save_ctxt.docs_for_attrs(attrs),
1266                             sig: sig::item_signature(item, &self.save_ctxt),
1267                             attributes: lower_attributes(attrs.to_vec(), &self.save_ctxt),
1268                         },
1269                     );
1270                 }
1271
1272                 self.visit_ty(ty);
1273                 self.process_generic_params(generics, &qualname, item.hir_id());
1274             }
1275             _ => intravisit::walk_item(self, item),
1276         }
1277     }
1278
1279     fn visit_generics(&mut self, generics: &'tcx hir::Generics<'tcx>) {
1280         for param in generics.params {
1281             match param.kind {
1282                 hir::GenericParamKind::Lifetime { .. } => {}
1283                 hir::GenericParamKind::Type { ref default, .. } => {
1284                     self.process_bounds(param.bounds);
1285                     if let Some(ref ty) = default {
1286                         self.visit_ty(ty);
1287                     }
1288                 }
1289                 hir::GenericParamKind::Const { ref ty, ref default } => {
1290                     self.process_bounds(param.bounds);
1291                     self.visit_ty(ty);
1292                     if let Some(default) = default {
1293                         self.visit_anon_const(default);
1294                     }
1295                 }
1296             }
1297         }
1298         for pred in generics.where_clause.predicates {
1299             if let hir::WherePredicate::BoundPredicate(ref wbp) = *pred {
1300                 self.process_bounds(wbp.bounds);
1301                 self.visit_ty(wbp.bounded_ty);
1302             }
1303         }
1304     }
1305
1306     fn visit_ty(&mut self, t: &'tcx hir::Ty<'tcx>) {
1307         self.process_macro_use(t.span);
1308         match t.kind {
1309             hir::TyKind::Path(ref path) => {
1310                 if generated_code(t.span) {
1311                     return;
1312                 }
1313
1314                 if let Some(id) = self.lookup_def_id(t.hir_id) {
1315                     let sub_span = path.last_segment_span();
1316                     let span = self.span_from_span(sub_span);
1317                     self.dumper.dump_ref(Ref {
1318                         kind: RefKind::Type,
1319                         span,
1320                         ref_id: id_from_def_id(id),
1321                     });
1322                 }
1323
1324                 if let hir::QPath::Resolved(_, path) = path {
1325                     self.write_sub_paths_truncated(path);
1326                 }
1327                 intravisit::walk_qpath(self, path, t.hir_id, t.span);
1328             }
1329             hir::TyKind::Array(ref ty, ref length) => {
1330                 self.visit_ty(ty);
1331                 let map = self.tcx.hir();
1332                 match length {
1333                     // FIXME(generic_arg_infer): We probably want to
1334                     // output the inferred type here? :shrug:
1335                     hir::ArrayLen::Infer(..) => {}
1336                     hir::ArrayLen::Body(anon_const) => self
1337                         .nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
1338                             v.visit_expr(&map.body(anon_const.body).value)
1339                         }),
1340                 }
1341             }
1342             hir::TyKind::OpaqueDef(item_id, _) => {
1343                 let item = self.tcx.hir().item(item_id);
1344                 self.nest_typeck_results(item_id.def_id, |v| v.visit_item(item));
1345             }
1346             _ => intravisit::walk_ty(self, t),
1347         }
1348     }
1349
1350     fn visit_expr(&mut self, ex: &'tcx hir::Expr<'tcx>) {
1351         debug!("visit_expr {:?}", ex.kind);
1352         self.process_macro_use(ex.span);
1353         match ex.kind {
1354             hir::ExprKind::Struct(ref path, ref fields, ref rest) => {
1355                 let hir_expr = self.save_ctxt.tcx.hir().expect_expr(ex.hir_id);
1356                 let adt = match self.save_ctxt.typeck_results().expr_ty_opt(&hir_expr) {
1357                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1358                     _ => {
1359                         intravisit::walk_expr(self, ex);
1360                         return;
1361                     }
1362                 };
1363                 let res = self.save_ctxt.get_path_res(hir_expr.hir_id);
1364                 self.process_struct_lit(ex, path, fields, adt.variant_of_res(res), *rest)
1365             }
1366             hir::ExprKind::MethodCall(ref seg, _, args, _) => {
1367                 self.process_method_call(ex, seg, args)
1368             }
1369             hir::ExprKind::Field(ref sub_ex, _) => {
1370                 self.visit_expr(&sub_ex);
1371
1372                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1373                     down_cast_data!(field_data, RefData, ex.span);
1374                     if !generated_code(ex.span) {
1375                         self.dumper.dump_ref(field_data);
1376                     }
1377                 }
1378             }
1379             hir::ExprKind::Closure(_, ref decl, body, _fn_decl_span, _) => {
1380                 let id = format!("${}", ex.hir_id);
1381
1382                 // walk arg and return types
1383                 for ty in decl.inputs {
1384                     self.visit_ty(ty);
1385                 }
1386
1387                 if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
1388                     self.visit_ty(ret_ty);
1389                 }
1390
1391                 // walk the body
1392                 let map = self.tcx.hir();
1393                 self.nest_typeck_results(self.tcx.hir().local_def_id(ex.hir_id), |v| {
1394                     let body = map.body(body);
1395                     v.process_formals(body.params, &id);
1396                     v.visit_expr(&body.value)
1397                 });
1398             }
1399             hir::ExprKind::Repeat(ref expr, ref length) => {
1400                 self.visit_expr(expr);
1401                 let map = self.tcx.hir();
1402                 match length {
1403                     // FIXME(generic_arg_infer): We probably want to
1404                     // output the inferred type here? :shrug:
1405                     hir::ArrayLen::Infer(..) => {}
1406                     hir::ArrayLen::Body(anon_const) => self
1407                         .nest_typeck_results(self.tcx.hir().local_def_id(anon_const.hir_id), |v| {
1408                             v.visit_expr(&map.body(anon_const.body).value)
1409                         }),
1410                 }
1411             }
1412             // In particular, we take this branch for call and path expressions,
1413             // where we'll index the idents involved just by continuing to walk.
1414             _ => intravisit::walk_expr(self, ex),
1415         }
1416     }
1417
1418     fn visit_pat(&mut self, p: &'tcx hir::Pat<'tcx>) {
1419         self.process_macro_use(p.span);
1420         self.process_pat(p);
1421     }
1422
1423     fn visit_arm(&mut self, arm: &'tcx hir::Arm<'tcx>) {
1424         self.process_var_decl(&arm.pat);
1425         if let Some(hir::Guard::If(expr)) = &arm.guard {
1426             self.visit_expr(expr);
1427         }
1428         self.visit_expr(&arm.body);
1429     }
1430
1431     fn visit_qpath(&mut self, path: &'tcx hir::QPath<'tcx>, id: hir::HirId, _: Span) {
1432         self.process_path(id, path);
1433     }
1434
1435     fn visit_stmt(&mut self, s: &'tcx hir::Stmt<'tcx>) {
1436         self.process_macro_use(s.span);
1437         intravisit::walk_stmt(self, s)
1438     }
1439
1440     fn visit_local(&mut self, l: &'tcx hir::Local<'tcx>) {
1441         self.process_macro_use(l.span);
1442         self.process_var_decl(&l.pat);
1443
1444         // Just walk the initialiser and type (don't want to walk the pattern again).
1445         walk_list!(self, visit_ty, &l.ty);
1446         walk_list!(self, visit_expr, &l.init);
1447     }
1448
1449     fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem<'tcx>) {
1450         let access = access_from!(self.save_ctxt, item, item.def_id);
1451
1452         match item.kind {
1453             hir::ForeignItemKind::Fn(decl, _, ref generics) => {
1454                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1455                     down_cast_data!(fn_data, DefData, item.span);
1456
1457                     self.process_generic_params(generics, &fn_data.qualname, item.hir_id());
1458                     self.dumper.dump_def(&access, fn_data);
1459                 }
1460
1461                 for ty in decl.inputs {
1462                     self.visit_ty(ty);
1463                 }
1464
1465                 if let hir::FnRetTy::Return(ref ret_ty) = decl.output {
1466                     self.visit_ty(ret_ty);
1467                 }
1468             }
1469             hir::ForeignItemKind::Static(ref ty, _) => {
1470                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1471                     down_cast_data!(var_data, DefData, item.span);
1472                     self.dumper.dump_def(&access, var_data);
1473                 }
1474
1475                 self.visit_ty(ty);
1476             }
1477             hir::ForeignItemKind::Type => {
1478                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1479                     down_cast_data!(var_data, DefData, item.span);
1480                     self.dumper.dump_def(&access, var_data);
1481                 }
1482             }
1483         }
1484     }
1485 }