src/librustc_save_analysis/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::hir::def::{Res, DefKind as HirDefKind};
  17 use rustc::hir::def_id::DefId;
  18 use rustc::session::config::Input;
  19 use rustc::span_bug;
  20 use rustc::ty::{self, DefIdTree, TyCtxt};
  21 use rustc_data_structures::fx::FxHashSet;
  22
  23 use std::path::Path;
  24 use std::env;
  25
  26 use syntax::ast::{self, Attribute, NodeId, PatKind};
  27 use syntax::parse::token;
  28 use syntax::visit::{self, Visitor};
  29 use syntax::print::pprust::{
  30     bounds_to_string,
  31     generic_params_to_string,
  32     ty_to_string
  33 };
  34 use syntax::ptr::P;
  35 use syntax::source_map::{DUMMY_SP, respan};
  36 use syntax::walk_list;
  37 use syntax_pos::*;
  38
  39 use crate::{escape, generated_code, id_from_def_id, id_from_node_id, lower_attributes,
  40             PathCollector, SaveContext};
  41 use crate::dumper::{Access, Dumper};
  42 use crate::span_utils::SpanUtils;
  43 use crate::sig;
  44
  45 use rls_data::{CompilationOptions, CratePreludeData, Def, DefKind, GlobalCrateId, Import,
  46                ImportKind, Ref, RefKind, Relation, RelationKind, SpanData};
  47
  48 use log::{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 {
  72             public: $vis.node.is_pub(),
  73             reachable: $save_ctxt.access_levels.is_reachable($id),
  74         }
  75     };
  76 }
  77
  78 pub struct DumpVisitor<'l, 'tcx> {
  79     pub save_ctxt: SaveContext<'l, 'tcx>,
  80     tcx: TyCtxt<'tcx>,
  81     dumper: Dumper,
  82
  83     span: SpanUtils<'l>,
  84
  85     // Set of macro definition (callee) spans, and the set
  86     // of macro use (callsite) spans. We store these to ensure
  87     // we only write one macro def per unique macro definition, and
  88     // one macro use per unique callsite span.
  89     // mac_defs: FxHashSet<Span>,
  90     // macro_calls: FxHashSet<Span>,
  91 }
  92
  93 impl<'l, 'tcx> DumpVisitor<'l, 'tcx> {
  94     pub fn new(
  95         save_ctxt: SaveContext<'l, 'tcx>,
  96     ) -> DumpVisitor<'l, 'tcx> {
  97         let span_utils = SpanUtils::new(&save_ctxt.tcx.sess);
  98         let dumper = Dumper::new(save_ctxt.config.clone());
  99         DumpVisitor {
 100             tcx: save_ctxt.tcx,
 101             save_ctxt,
 102             dumper,
 103             span: span_utils,
 104             // mac_defs: FxHashSet::default(),
 105             // macro_calls: FxHashSet::default(),
 106         }
 107     }
 108
 109     pub fn analysis(&self) -> &rls_data::Analysis {
 110         self.dumper.analysis()
 111     }
 112
 113     fn nest_tables<F>(&mut self, item_id: NodeId, f: F)
 114     where
 115         F: FnOnce(&mut Self),
 116     {
 117         let item_def_id = self.tcx.hir().local_def_id_from_node_id(item_id);
 118         if self.tcx.has_typeck_tables(item_def_id) {
 119             let tables = self.tcx.typeck_tables_of(item_def_id);
 120             let old_tables = self.save_ctxt.tables;
 121             self.save_ctxt.tables = tables;
 122             f(self);
 123             self.save_ctxt.tables = old_tables;
 124         } else {
 125             f(self);
 126         }
 127     }
 128
 129     fn span_from_span(&self, span: Span) -> SpanData {
 130         self.save_ctxt.span_from_span(span)
 131     }
 132
 133     fn lookup_def_id(&self, ref_id: NodeId) -> Option<DefId> {
 134         self.save_ctxt.lookup_def_id(ref_id)
 135     }
 136
 137     pub fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
 138         let source_file = self.tcx.sess.local_crate_source_file.as_ref();
 139         let crate_root = source_file.map(|source_file| {
 140             let source_file = Path::new(source_file);
 141             match source_file.file_name() {
 142                 Some(_) => source_file.parent().unwrap().display(),
 143                 None => source_file.display(),
 144             }.to_string()
 145         });
 146
 147         let data = CratePreludeData {
 148             crate_id: GlobalCrateId {
 149                 name: name.into(),
 150                 disambiguator: self.tcx
 151                     .sess
 152                     .local_crate_disambiguator()
 153                     .to_fingerprint()
 154                     .as_value(),
 155             },
 156             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 157             external_crates: self.save_ctxt.get_external_crates(),
 158             span: self.span_from_span(krate.span),
 159         };
 160
 161         self.dumper.crate_prelude(data);
 162     }
 163
 164     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
 165         // Apply possible `remap-path-prefix` remapping to the input source file
 166         // (and don't include remapping args anymore)
 167         let (program, arguments) = {
 168             let remap_arg_indices = {
 169                 let mut indices = FxHashSet::default();
 170                 // Args are guaranteed to be valid UTF-8 (checked early)
 171                 for (i, e) in env::args().enumerate() {
 172                     if e.starts_with("--remap-path-prefix=") {
 173                         indices.insert(i);
 174                     } else if e == "--remap-path-prefix" {
 175                         indices.insert(i);
 176                         indices.insert(i + 1);
 177                     }
 178                 }
 179                 indices
 180             };
 181
 182             let mut args = env::args()
 183                 .enumerate()
 184                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 185                 .map(|(_, arg)| {
 186                     match input {
 187                         Input::File(ref path) if path == Path::new(&arg) => {
 188                             let mapped = &self.tcx.sess.local_crate_source_file;
 189                             mapped
 190                                 .as_ref()
 191                                 .unwrap()
 192                                 .to_string_lossy()
 193                                 .into()
 194                         },
 195                         _ => arg,
 196                     }
 197                 });
 198
 199             (args.next().unwrap(), args.collect())
 200         };
 201
 202         let data = CompilationOptions {
 203             directory: self.tcx.sess.working_dir.0.clone(),
 204             program,
 205             arguments,
 206             output: self.save_ctxt.compilation_output(crate_name),
 207         };
 208
 209         self.dumper.compilation_opts(data);
 210     }
 211
 212     fn write_sub_paths(&mut self, path: &ast::Path) {
 213         for seg in &path.segments {
 214             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 215                 self.dumper.dump_ref(data);
 216             }
 217         }
 218     }
 219
 220     // As write_sub_paths, but does not process the last ident in the path (assuming it
 221     // will be processed elsewhere). See note on write_sub_paths about global.
 222     fn write_sub_paths_truncated(&mut self, path: &ast::Path) {
 223         for seg in &path.segments[..path.segments.len() - 1] {
 224             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 225                 self.dumper.dump_ref(data);
 226             }
 227         }
 228     }
 229
 230     fn process_formals(&mut self, formals: &'l [ast::Param], qualname: &str) {
 231         for arg in formals {
 232             self.visit_pat(&arg.pat);
 233             let mut collector = PathCollector::new();
 234             collector.visit_pat(&arg.pat);
 235
 236             for (id, ident, ..) in collector.collected_idents {
 237                 let hir_id = self.tcx.hir().node_to_hir_id(id);
 238                 let typ = match self.save_ctxt.tables.node_type_opt(hir_id) {
 239                     Some(s) => s.to_string(),
 240                     None => continue,
 241                 };
 242                 if !self.span.filter_generated(ident.span) {
 243                     let id = id_from_node_id(id, &self.save_ctxt);
 244                     let span = self.span_from_span(ident.span);
 245
 246                     self.dumper.dump_def(
 247                         &Access {
 248                             public: false,
 249                             reachable: false,
 250                         },
 251                         Def {
 252                             kind: DefKind::Local,
 253                             id,
 254                             span,
 255                             name: ident.to_string(),
 256                             qualname: format!("{}::{}", qualname, ident.to_string()),
 257                             value: typ,
 258                             parent: None,
 259                             children: vec![],
 260                             decl_id: None,
 261                             docs: String::new(),
 262                             sig: None,
 263                             attributes: vec![],
 264                         },
 265                     );
 266                 }
 267             }
 268         }
 269     }
 270
 271     fn process_method(
 272         &mut self,
 273         sig: &'l ast::MethodSig,
 274         body: Option<&'l ast::Block>,
 275         id: ast::NodeId,
 276         ident: ast::Ident,
 277         generics: &'l ast::Generics,
 278         vis: ast::Visibility,
 279         span: Span,
 280     ) {
 281         debug!("process_method: {}:{}", id, ident);
 282
 283         let hir_id = self.tcx.hir().node_to_hir_id(id);
 284         self.nest_tables(id, |v| {
 285             if let Some(mut method_data) = v.save_ctxt.get_method_data(id, ident, span) {
 286                 v.process_formals(&sig.decl.inputs, &method_data.qualname);
 287                 v.process_generic_params(&generics, &method_data.qualname, id);
 288
 289                 method_data.value = crate::make_signature(&sig.decl, &generics);
 290                 method_data.sig = sig::method_signature(id, ident, generics, sig, &v.save_ctxt);
 291
 292                 v.dumper.dump_def(&access_from_vis!(v.save_ctxt, vis, hir_id), method_data);
 293             }
 294
 295             // walk arg and return types
 296             for arg in &sig.decl.inputs {
 297                 v.visit_ty(&arg.ty);
 298             }
 299
 300             if let ast::FunctionRetTy::Ty(ref ret_ty) = sig.decl.output {
 301                 v.visit_ty(ret_ty);
 302             }
 303
 304             // walk the fn body
 305             if let Some(body) = body {
 306                 v.visit_block(body);
 307             }
 308         });
 309     }
 310
 311     fn process_struct_field_def(&mut self, field: &ast::StructField, parent_id: NodeId) {
 312         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 313         if let Some(field_data) = field_data {
 314             let hir_id = self.tcx.hir().node_to_hir_id(field.id);
 315             self.dumper.dump_def(&access_from!(self.save_ctxt, field, hir_id), field_data);
 316         }
 317     }
 318
 319     // Dump generic params bindings, then visit_generics
 320     fn process_generic_params(
 321         &mut self,
 322         generics: &'l ast::Generics,
 323         prefix: &str,
 324         id: NodeId,
 325     ) {
 326         for param in &generics.params {
 327             match param.kind {
 328                 ast::GenericParamKind::Lifetime { .. } => {}
 329                 ast::GenericParamKind::Type { .. } => {
 330                     let param_ss = param.ident.span;
 331                     let name = escape(self.span.snippet(param_ss));
 332                     // Append $id to name to make sure each one is unique.
 333                     let qualname = format!("{}::{}${}", prefix, name, id);
 334                     if !self.span.filter_generated(param_ss) {
 335                         let id = id_from_node_id(param.id, &self.save_ctxt);
 336                         let span = self.span_from_span(param_ss);
 337
 338                         self.dumper.dump_def(
 339                             &Access {
 340                                 public: false,
 341                                 reachable: false,
 342                             },
 343                             Def {
 344                                 kind: DefKind::Type,
 345                                 id,
 346                                 span,
 347                                 name,
 348                                 qualname,
 349                                 value: String::new(),
 350                                 parent: None,
 351                                 children: vec![],
 352                                 decl_id: None,
 353                                 docs: String::new(),
 354                                 sig: None,
 355                                 attributes: vec![],
 356                             },
 357                         );
 358                     }
 359                 }
 360                 ast::GenericParamKind::Const { .. } => {}
 361             }
 362         }
 363         self.visit_generics(generics);
 364     }
 365
 366     fn process_fn(
 367         &mut self,
 368         item: &'l ast::Item,
 369         decl: &'l ast::FnDecl,
 370         ty_params: &'l ast::Generics,
 371         body: &'l ast::Block,
 372     ) {
 373         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 374         self.nest_tables(item.id, |v| {
 375             if let Some(fn_data) = v.save_ctxt.get_item_data(item) {
 376                 down_cast_data!(fn_data, DefData, item.span);
 377                 v.process_formals(&decl.inputs, &fn_data.qualname);
 378                 v.process_generic_params(ty_params, &fn_data.qualname, item.id);
 379
 380                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, hir_id), fn_data);
 381             }
 382
 383             for arg in &decl.inputs {
 384                 v.visit_ty(&arg.ty)
 385             }
 386
 387             if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
 388                 if let ast::TyKind::ImplTrait(..) = ret_ty.node {
 389                     // FIXME: Opaque type desugaring prevents us from easily
 390                     // processing trait bounds. See `visit_ty` for more details.
 391                 } else {
 392                     v.visit_ty(&ret_ty);
 393                 }
 394             }
 395
 396             v.visit_block(&body);
 397         });
 398     }
 399
 400     fn process_static_or_const_item(
 401         &mut self,
 402         item: &'l ast::Item,
 403         typ: &'l ast::Ty,
 404         expr: &'l ast::Expr,
 405     ) {
 406         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 407         self.nest_tables(item.id, |v| {
 408             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 409                 down_cast_data!(var_data, DefData, item.span);
 410                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, hir_id), var_data);
 411             }
 412             v.visit_ty(&typ);
 413             v.visit_expr(expr);
 414         });
 415     }
 416
 417     fn process_assoc_const(
 418         &mut self,
 419         id: ast::NodeId,
 420         ident: ast::Ident,
 421         typ: &'l ast::Ty,
 422         expr: Option<&'l ast::Expr>,
 423         parent_id: DefId,
 424         vis: ast::Visibility,
 425         attrs: &'l [Attribute],
 426     ) {
 427         let qualname = format!("::{}",
 428             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(id)));
 429
 430         if !self.span.filter_generated(ident.span) {
 431             let sig = sig::assoc_const_signature(id, ident.name, typ, expr, &self.save_ctxt);
 432             let span = self.span_from_span(ident.span);
 433             let hir_id = self.tcx.hir().node_to_hir_id(id);
 434
 435             self.dumper.dump_def(
 436                 &access_from_vis!(self.save_ctxt, vis, hir_id),
 437                 Def {
 438                     kind: DefKind::Const,
 439                     id: id_from_node_id(id, &self.save_ctxt),
 440                     span,
 441                     name: ident.name.to_string(),
 442                     qualname,
 443                     value: ty_to_string(&typ),
 444                     parent: Some(id_from_def_id(parent_id)),
 445                     children: vec![],
 446                     decl_id: None,
 447                     docs: self.save_ctxt.docs_for_attrs(attrs),
 448                     sig,
 449                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 450                 },
 451             );
 452         }
 453
 454         // walk type and init value
 455         self.nest_tables(id, |v| {
 456             v.visit_ty(typ);
 457             if let Some(expr) = expr {
 458                 v.visit_expr(expr);
 459             }
 460         });
 461     }
 462
 463     // FIXME tuple structs should generate tuple-specific data.
 464     fn process_struct(
 465         &mut self,
 466         item: &'l ast::Item,
 467         def: &'l ast::VariantData,
 468         ty_params: &'l ast::Generics,
 469     ) {
 470         debug!("process_struct {:?} {:?}", item, item.span);
 471         let name = item.ident.to_string();
 472         let qualname = format!("::{}",
 473             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
 474
 475         let kind = match item.node {
 476             ast::ItemKind::Struct(_, _) => DefKind::Struct,
 477             ast::ItemKind::Union(_, _) => DefKind::Union,
 478             _ => unreachable!(),
 479         };
 480
 481         let (value, fields) = match item.node {
 482             ast::ItemKind::Struct(ast::VariantData::Struct(ref fields, ..), ..) |
 483             ast::ItemKind::Union(ast::VariantData::Struct(ref fields, ..), ..) => {
 484                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 485                 let fields_str = fields
 486                     .iter()
 487                     .enumerate()
 488                     .filter_map(|(i, f)| {
 489                         if include_priv_fields || f.vis.node.is_pub() {
 490                             f.ident
 491                                 .map(|i| i.to_string())
 492                                 .or_else(|| Some(i.to_string()))
 493                         } else {
 494                             None
 495                         }
 496                     })
 497                     .collect::<Vec<_>>()
 498                     .join(", ");
 499                 let value = format!("{} {{ {} }}", name, fields_str);
 500                 (
 501                     value,
 502                     fields
 503                         .iter()
 504                         .map(|f| id_from_node_id(f.id, &self.save_ctxt))
 505                         .collect(),
 506                 )
 507             }
 508             _ => (String::new(), vec![]),
 509         };
 510
 511         if !self.span.filter_generated(item.ident.span) {
 512             let span = self.span_from_span(item.ident.span);
 513             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 514             self.dumper.dump_def(
 515                 &access_from!(self.save_ctxt, item, hir_id),
 516                 Def {
 517                     kind,
 518                     id: id_from_node_id(item.id, &self.save_ctxt),
 519                     span,
 520                     name,
 521                     qualname: qualname.clone(),
 522                     value,
 523                     parent: None,
 524                     children: fields,
 525                     decl_id: None,
 526                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 527                     sig: sig::item_signature(item, &self.save_ctxt),
 528                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 529                 },
 530             );
 531         }
 532
 533         for field in def.fields() {
 534             self.process_struct_field_def(field, item.id);
 535             self.visit_ty(&field.ty);
 536         }
 537
 538         self.process_generic_params(ty_params, &qualname, item.id);
 539     }
 540
 541     fn process_enum(
 542         &mut self,
 543         item: &'l ast::Item,
 544         enum_definition: &'l ast::EnumDef,
 545         ty_params: &'l ast::Generics,
 546     ) {
 547         let enum_data = self.save_ctxt.get_item_data(item);
 548         let enum_data = match enum_data {
 549             None => return,
 550             Some(data) => data,
 551         };
 552         down_cast_data!(enum_data, DefData, item.span);
 553
 554         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 555         let access = access_from!(self.save_ctxt, item, hir_id);
 556
 557         for variant in &enum_definition.variants {
 558             let name = variant.ident.name.to_string();
 559             let qualname = format!("{}::{}", enum_data.qualname, name);
 560             let name_span = variant.ident.span;
 561
 562             match variant.data {
 563                 ast::VariantData::Struct(ref fields, ..) => {
 564                     let fields_str = fields
 565                         .iter()
 566                         .enumerate()
 567                         .map(|(i, f)| {
 568                             f.ident.map(|i| i.to_string()).unwrap_or_else(|| i.to_string())
 569                         })
 570                         .collect::<Vec<_>>()
 571                         .join(", ");
 572                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 573                     if !self.span.filter_generated(name_span) {
 574                         let span = self.span_from_span(name_span);
 575                         let id = id_from_node_id(variant.id, &self.save_ctxt);
 576                         let parent = Some(id_from_node_id(item.id, &self.save_ctxt));
 577
 578                         self.dumper.dump_def(
 579                             &access,
 580                             Def {
 581                                 kind: DefKind::StructVariant,
 582                                 id,
 583                                 span,
 584                                 name,
 585                                 qualname,
 586                                 value,
 587                                 parent,
 588                                 children: vec![],
 589                                 decl_id: None,
 590                                 docs: self.save_ctxt.docs_for_attrs(&variant.attrs),
 591                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 592                                 attributes: lower_attributes(
 593                                     variant.attrs.clone(),
 594                                     &self.save_ctxt,
 595                                 ),
 596                             },
 597                         );
 598                     }
 599                 }
 600                 ref v => {
 601                     let mut value = format!("{}::{}", enum_data.name, name);
 602                     if let &ast::VariantData::Tuple(ref fields, _) = v {
 603                         value.push('(');
 604                         value.push_str(&fields
 605                             .iter()
 606                             .map(|f| ty_to_string(&f.ty))
 607                             .collect::<Vec<_>>()
 608                             .join(", "));
 609                         value.push(')');
 610                     }
 611                     if !self.span.filter_generated(name_span) {
 612                         let span = self.span_from_span(name_span);
 613                         let id = id_from_node_id(variant.id, &self.save_ctxt);
 614                         let parent = Some(id_from_node_id(item.id, &self.save_ctxt));
 615
 616                         self.dumper.dump_def(
 617                             &access,
 618                             Def {
 619                                 kind: DefKind::TupleVariant,
 620                                 id,
 621                                 span,
 622                                 name,
 623                                 qualname,
 624                                 value,
 625                                 parent,
 626                                 children: vec![],
 627                                 decl_id: None,
 628                                 docs: self.save_ctxt.docs_for_attrs(&variant.attrs),
 629                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 630                                 attributes: lower_attributes(
 631                                     variant.attrs.clone(),
 632                                     &self.save_ctxt,
 633                                 ),
 634                             },
 635                         );
 636                     }
 637                 }
 638             }
 639
 640
 641             for field in variant.data.fields() {
 642                 self.process_struct_field_def(field, variant.id);
 643                 self.visit_ty(&field.ty);
 644             }
 645         }
 646         self.process_generic_params(ty_params, &enum_data.qualname, item.id);
 647         self.dumper.dump_def(&access, enum_data);
 648     }
 649
 650     fn process_impl(
 651         &mut self,
 652         item: &'l ast::Item,
 653         generics: &'l ast::Generics,
 654         trait_ref: &'l Option<ast::TraitRef>,
 655         typ: &'l ast::Ty,
 656         impl_items: &'l [ast::ImplItem],
 657     ) {
 658         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 659             if !self.span.filter_generated(item.span) {
 660                 if let super::Data::RelationData(rel, imp) = impl_data {
 661                     self.dumper.dump_relation(rel);
 662                     self.dumper.dump_impl(imp);
 663                 } else {
 664                     span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 665                 }
 666             }
 667         }
 668         self.visit_ty(&typ);
 669         if let &Some(ref trait_ref) = trait_ref {
 670             self.process_path(trait_ref.ref_id, &trait_ref.path);
 671         }
 672         self.process_generic_params(generics, "", item.id);
 673         for impl_item in impl_items {
 674             let map = &self.tcx.hir();
 675             self.process_impl_item(impl_item, map.local_def_id_from_node_id(item.id));
 676         }
 677     }
 678
 679     fn process_trait(
 680         &mut self,
 681         item: &'l ast::Item,
 682         generics: &'l ast::Generics,
 683         trait_refs: &'l ast::GenericBounds,
 684         methods: &'l [ast::TraitItem],
 685     ) {
 686         let name = item.ident.to_string();
 687         let qualname = format!("::{}",
 688             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
 689         let mut val = name.clone();
 690         if !generics.params.is_empty() {
 691             val.push_str(&generic_params_to_string(&generics.params));
 692         }
 693         if !trait_refs.is_empty() {
 694             val.push_str(": ");
 695             val.push_str(&bounds_to_string(trait_refs));
 696         }
 697         if !self.span.filter_generated(item.ident.span) {
 698             let id = id_from_node_id(item.id, &self.save_ctxt);
 699             let span = self.span_from_span(item.ident.span);
 700             let children = methods
 701                 .iter()
 702                 .map(|i| id_from_node_id(i.id, &self.save_ctxt))
 703                 .collect();
 704             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 705             self.dumper.dump_def(
 706                 &access_from!(self.save_ctxt, item, hir_id),
 707                 Def {
 708                     kind: DefKind::Trait,
 709                     id,
 710                     span,
 711                     name,
 712                     qualname: qualname.clone(),
 713                     value: val,
 714                     parent: None,
 715                     children,
 716                     decl_id: None,
 717                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 718                     sig: sig::item_signature(item, &self.save_ctxt),
 719                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 720                 },
 721             );
 722         }
 723
 724         // super-traits
 725         for super_bound in trait_refs.iter() {
 726             let trait_ref = match *super_bound {
 727                 ast::GenericBound::Trait(ref trait_ref, _) => trait_ref,
 728                 ast::GenericBound::Outlives(..) => continue,
 729             };
 730
 731             let trait_ref = &trait_ref.trait_ref;
 732             if let Some(id) = self.lookup_def_id(trait_ref.ref_id) {
 733                 let sub_span = trait_ref.path.segments.last().unwrap().ident.span;
 734                 if !self.span.filter_generated(sub_span) {
 735                     let span = self.span_from_span(sub_span);
 736                     self.dumper.dump_ref(Ref {
 737                         kind: RefKind::Type,
 738                         span: span.clone(),
 739                         ref_id: id_from_def_id(id),
 740                     });
 741
 742                     self.dumper.dump_relation(Relation {
 743                         kind: RelationKind::SuperTrait,
 744                         span,
 745                         from: id_from_def_id(id),
 746                         to: id_from_node_id(item.id, &self.save_ctxt),
 747                     });
 748                 }
 749             }
 750         }
 751
 752         // walk generics and methods
 753         self.process_generic_params(generics, &qualname, item.id);
 754         for method in methods {
 755             let map = &self.tcx.hir();
 756             self.process_trait_item(method, map.local_def_id_from_node_id(item.id))
 757         }
 758     }
 759
 760     // `item` is the module in question, represented as an item.
 761     fn process_mod(&mut self, item: &ast::Item) {
 762         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 763             down_cast_data!(mod_data, DefData, item.span);
 764             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 765             self.dumper.dump_def(&access_from!(self.save_ctxt, item, hir_id), mod_data);
 766         }
 767     }
 768
 769     fn dump_path_ref(&mut self, id: NodeId, path: &ast::Path) {
 770         let path_data = self.save_ctxt.get_path_data(id, path);
 771         if let Some(path_data) = path_data {
 772             self.dumper.dump_ref(path_data);
 773         }
 774     }
 775
 776     fn process_path(&mut self, id: NodeId, path: &'l ast::Path) {
 777         if self.span.filter_generated(path.span) {
 778             return;
 779         }
 780         self.dump_path_ref(id, path);
 781
 782         // Type arguments
 783         for seg in &path.segments {
 784             if let Some(ref generic_args) = seg.args {
 785                 match **generic_args {
 786                     ast::GenericArgs::AngleBracketed(ref data) => {
 787                         for arg in &data.args {
 788                             match arg {
 789                                 ast::GenericArg::Type(ty) => self.visit_ty(ty),
 790                                 _ => {}
 791                             }
 792                         }
 793                     }
 794                     ast::GenericArgs::Parenthesized(ref data) => {
 795                         for t in &data.inputs {
 796                             self.visit_ty(t);
 797                         }
 798                         if let Some(ref t) = data.output {
 799                             self.visit_ty(t);
 800                         }
 801                     }
 802                 }
 803             }
 804         }
 805
 806         self.write_sub_paths_truncated(path);
 807     }
 808
 809     fn process_struct_lit(
 810         &mut self,
 811         ex: &'l ast::Expr,
 812         path: &'l ast::Path,
 813         fields: &'l [ast::Field],
 814         variant: &'l ty::VariantDef,
 815         base: &'l Option<P<ast::Expr>>,
 816     ) {
 817         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 818             self.write_sub_paths_truncated(path);
 819             down_cast_data!(struct_lit_data, RefData, ex.span);
 820             if !generated_code(ex.span) {
 821                 self.dumper.dump_ref(struct_lit_data);
 822             }
 823
 824             for field in fields {
 825                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 826                     self.dumper.dump_ref(field_data);
 827                 }
 828
 829                 self.visit_expr(&field.expr)
 830             }
 831         }
 832
 833         walk_list!(self, visit_expr, base);
 834     }
 835
 836     fn process_method_call(
 837         &mut self,
 838         ex: &'l ast::Expr,
 839         seg: &'l ast::PathSegment,
 840         args: &'l [P<ast::Expr>],
 841     ) {
 842         debug!("process_method_call {:?} {:?}", ex, ex.span);
 843         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 844             down_cast_data!(mcd, RefData, ex.span);
 845             if !generated_code(ex.span) {
 846                 self.dumper.dump_ref(mcd);
 847             }
 848         }
 849
 850         // Explicit types in the turbo-fish.
 851         if let Some(ref generic_args) = seg.args {
 852             if let ast::GenericArgs::AngleBracketed(ref data) = **generic_args {
 853                 for arg in &data.args {
 854                     match arg {
 855                         ast::GenericArg::Type(ty) => self.visit_ty(ty),
 856                         _ => {}
 857                     }
 858                 }
 859             }
 860         }
 861
 862         // walk receiver and args
 863         walk_list!(self, visit_expr, args);
 864     }
 865
 866     fn process_pat(&mut self, p: &'l ast::Pat) {
 867         match p.node {
 868             PatKind::Struct(ref _path, ref fields, _) => {
 869                 // FIXME do something with _path?
 870                 let hir_id = self.tcx.hir().node_to_hir_id(p.id);
 871                 let adt = match self.save_ctxt.tables.node_type_opt(hir_id) {
 872                     Some(ty) => ty.ty_adt_def().unwrap(),
 873                     None => {
 874                         visit::walk_pat(self, p);
 875                         return;
 876                     }
 877                 };
 878                 let variant = adt.variant_of_res(self.save_ctxt.get_path_res(p.id));
 879
 880                 for field in fields {
 881                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 882                         if !self.span.filter_generated(field.ident.span) {
 883                             let span = self.span_from_span(field.ident.span);
 884                             self.dumper.dump_ref(Ref {
 885                                 kind: RefKind::Variable,
 886                                 span,
 887                                 ref_id: id_from_def_id(variant.fields[index].did),
 888                             });
 889                         }
 890                     }
 891                     self.visit_pat(&field.pat);
 892                 }
 893             }
 894             _ => visit::walk_pat(self, p),
 895         }
 896     }
 897
 898     fn process_var_decl(&mut self, pat: &'l ast::Pat) {
 899         // The pattern could declare multiple new vars,
 900         // we must walk the pattern and collect them all.
 901         let mut collector = PathCollector::new();
 902         collector.visit_pat(&pat);
 903         self.visit_pat(&pat);
 904
 905         // Process collected paths.
 906         for (id, ident, _) in collector.collected_idents {
 907             match self.save_ctxt.get_path_res(id) {
 908                 Res::Local(hir_id) => {
 909                     let id = self.tcx.hir().hir_to_node_id(hir_id);
 910                     let typ = self.save_ctxt.tables.node_type_opt(hir_id)
 911                         .map(|t| t.to_string())
 912                         .unwrap_or_default();
 913
 914                     // Rust uses the id of the pattern for var lookups, so we'll use it too.
 915                     if !self.span.filter_generated(ident.span) {
 916                         let qualname = format!("{}${}", ident.to_string(), id);
 917                         let id = id_from_node_id(id, &self.save_ctxt);
 918                         let span = self.span_from_span(ident.span);
 919
 920                         self.dumper.dump_def(
 921                             &Access {
 922                                 public: false,
 923                                 reachable: false,
 924                             },
 925                             Def {
 926                                 kind: DefKind::Local,
 927                                 id,
 928                                 span,
 929                                 name: ident.to_string(),
 930                                 qualname,
 931                                 value: typ,
 932                                 parent: None,
 933                                 children: vec![],
 934                                 decl_id: None,
 935                                 docs: String::new(),
 936                                 sig: None,
 937                                 attributes: vec![],
 938                             },
 939                         );
 940                     }
 941                 }
 942                 Res::Def(HirDefKind::Ctor(..), _) |
 943                 Res::Def(HirDefKind::Const, _) |
 944                 Res::Def(HirDefKind::AssocConst, _) |
 945                 Res::Def(HirDefKind::Struct, _) |
 946                 Res::Def(HirDefKind::Variant, _) |
 947                 Res::Def(HirDefKind::TyAlias, _) |
 948                 Res::Def(HirDefKind::AssocTy, _) |
 949                 Res::SelfTy(..) => {
 950                     self.dump_path_ref(id, &ast::Path::from_ident(ident));
 951                 }
 952                 def => error!(
 953                     "unexpected definition kind when processing collected idents: {:?}",
 954                     def
 955                 ),
 956             }
 957         }
 958
 959         for (id, ref path) in collector.collected_paths {
 960             self.process_path(id, path);
 961         }
 962     }
 963
 964     /// Extracts macro use and definition information from the AST node defined
 965     /// by the given NodeId, using the expansion information from the node's
 966     /// span.
 967     ///
 968     /// If the span is not macro-generated, do nothing, else use callee and
 969     /// callsite spans to record macro definition and use data, using the
 970     /// mac_uses and mac_defs sets to prevent multiples.
 971     fn process_macro_use(&mut self, _span: Span) {
 972         // FIXME if we're not dumping the defs (see below), there is no point
 973         // dumping refs either.
 974         // let source_span = span.source_callsite();
 975         // if !self.macro_calls.insert(source_span) {
 976         //     return;
 977         // }
 978
 979         // let data = match self.save_ctxt.get_macro_use_data(span) {
 980         //     None => return,
 981         //     Some(data) => data,
 982         // };
 983
 984         // self.dumper.macro_use(data);
 985
 986         // FIXME write the macro def
 987         // let mut hasher = DefaultHasher::new();
 988         // data.callee_span.hash(&mut hasher);
 989         // let hash = hasher.finish();
 990         // let qualname = format!("{}::{}", data.name, hash);
 991         // Don't write macro definition for imported macros
 992         // if !self.mac_defs.contains(&data.callee_span)
 993         //     && !data.imported {
 994         //     self.mac_defs.insert(data.callee_span);
 995         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
 996         //         self.dumper.macro_data(MacroData {
 997         //             span: sub_span,
 998         //             name: data.name.clone(),
 999         //             qualname: qualname.clone(),
1000         //             // FIXME where do macro docs come from?
1001         //             docs: String::new(),
1002         //         }.lower(self.tcx));
1003         //     }
1004         // }
1005     }
1006
1007     fn process_trait_item(&mut self, trait_item: &'l ast::TraitItem, trait_id: DefId) {
1008         self.process_macro_use(trait_item.span);
1009         let vis_span = trait_item.span.shrink_to_lo();
1010         match trait_item.node {
1011             ast::TraitItemKind::Const(ref ty, ref expr) => {
1012                 self.process_assoc_const(
1013                     trait_item.id,
1014                     trait_item.ident,
1015                     &ty,
1016                     expr.as_ref().map(|e| &**e),
1017                     trait_id,
1018                     respan(vis_span, ast::VisibilityKind::Public),
1019                     &trait_item.attrs,
1020                 );
1021             }
1022             ast::TraitItemKind::Method(ref sig, ref body) => {
1023                 self.process_method(
1024                     sig,
1025                     body.as_ref().map(|x| &**x),
1026                     trait_item.id,
1027                     trait_item.ident,
1028                     &trait_item.generics,
1029                     respan(vis_span, ast::VisibilityKind::Public),
1030                     trait_item.span,
1031                 );
1032             }
1033             ast::TraitItemKind::Type(ref bounds, ref default_ty) => {
1034                 // FIXME do something with _bounds (for type refs)
1035                 let name = trait_item.ident.name.to_string();
1036                 let qualname = format!("::{}",
1037                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(trait_item.id)));
1038
1039                 if !self.span.filter_generated(trait_item.ident.span) {
1040                     let span = self.span_from_span(trait_item.ident.span);
1041                     let id = id_from_node_id(trait_item.id, &self.save_ctxt);
1042
1043                     self.dumper.dump_def(
1044                         &Access {
1045                             public: true,
1046                             reachable: true,
1047                         },
1048                         Def {
1049                             kind: DefKind::Type,
1050                             id,
1051                             span,
1052                             name,
1053                             qualname,
1054                             value: self.span.snippet(trait_item.span),
1055                             parent: Some(id_from_def_id(trait_id)),
1056                             children: vec![],
1057                             decl_id: None,
1058                             docs: self.save_ctxt.docs_for_attrs(&trait_item.attrs),
1059                             sig: sig::assoc_type_signature(
1060                                 trait_item.id,
1061                                 trait_item.ident,
1062                                 Some(bounds),
1063                                 default_ty.as_ref().map(|ty| &**ty),
1064                                 &self.save_ctxt,
1065                             ),
1066                             attributes: lower_attributes(trait_item.attrs.clone(), &self.save_ctxt),
1067                         },
1068                     );
1069                 }
1070
1071                 if let &Some(ref default_ty) = default_ty {
1072                     self.visit_ty(default_ty)
1073                 }
1074             }
1075             ast::TraitItemKind::Macro(_) => {}
1076         }
1077     }
1078
1079     fn process_impl_item(&mut self, impl_item: &'l ast::ImplItem, impl_id: DefId) {
1080         self.process_macro_use(impl_item.span);
1081         match impl_item.node {
1082             ast::ImplItemKind::Const(ref ty, ref expr) => {
1083                 self.process_assoc_const(
1084                     impl_item.id,
1085                     impl_item.ident,
1086                     &ty,
1087                     Some(expr),
1088                     impl_id,
1089                     impl_item.vis.clone(),
1090                     &impl_item.attrs,
1091                 );
1092             }
1093             ast::ImplItemKind::Method(ref sig, ref body) => {
1094                 self.process_method(
1095                     sig,
1096                     Some(body),
1097                     impl_item.id,
1098                     impl_item.ident,
1099                     &impl_item.generics,
1100                     impl_item.vis.clone(),
1101                     impl_item.span,
1102                 );
1103             }
1104             ast::ImplItemKind::TyAlias(ref ty) => {
1105                 // FIXME: uses of the assoc type should ideally point to this
1106                 // 'def' and the name here should be a ref to the def in the
1107                 // trait.
1108                 self.visit_ty(ty)
1109             }
1110             ast::ImplItemKind::OpaqueTy(ref bounds) => {
1111                 // FIXME: uses of the assoc type should ideally point to this
1112                 // 'def' and the name here should be a ref to the def in the
1113                 // trait.
1114                 self.process_bounds(&bounds);
1115             }
1116             ast::ImplItemKind::Macro(_) => {}
1117         }
1118     }
1119
1120     /// Dumps imports in a use tree recursively.
1121     ///
1122     /// A use tree is an import that may contain nested braces (RFC 2128). The `use_tree` parameter
1123     /// is the current use tree under scrutiny, while `id` and `prefix` are its corresponding node
1124     /// ID and path. `root_item` is the topmost use tree in the hierarchy.
1125     ///
1126     /// If `use_tree` is a simple or glob import, it is dumped into the analysis data. Otherwise,
1127     /// each child use tree is dumped recursively.
1128     fn process_use_tree(&mut self,
1129                          use_tree: &'l ast::UseTree,
1130                          id: NodeId,
1131                          root_item: &'l ast::Item,
1132                          prefix: &ast::Path) {
1133         let path = &use_tree.prefix;
1134
1135         // The access is calculated using the current tree ID, but with the root tree's visibility
1136         // (since nested trees don't have their own visibility).
1137         let hir_id = self.tcx.hir().node_to_hir_id(id);
1138         let access = access_from!(self.save_ctxt, root_item, hir_id);
1139
1140         // The parent `DefId` of a given use tree is always the enclosing item.
1141         let parent = self.save_ctxt.tcx.hir().opt_local_def_id_from_node_id(id)
1142             .and_then(|id| self.save_ctxt.tcx.parent(id))
1143             .map(id_from_def_id);
1144
1145         match use_tree.kind {
1146             ast::UseTreeKind::Simple(alias, ..) => {
1147                 let ident = use_tree.ident();
1148                 let path = ast::Path {
1149                     segments: prefix.segments
1150                         .iter()
1151                         .chain(path.segments.iter())
1152                         .cloned()
1153                         .collect(),
1154                     span: path.span,
1155                 };
1156
1157                 let sub_span = path.segments.last().unwrap().ident.span;
1158                 if !self.span.filter_generated(sub_span) {
1159                     let ref_id = self.lookup_def_id(id).map(|id| id_from_def_id(id));
1160                     let alias_span = alias.map(|i| self.span_from_span(i.span));
1161                     let span = self.span_from_span(sub_span);
1162                     self.dumper.import(&access, Import {
1163                         kind: ImportKind::Use,
1164                         ref_id,
1165                         span,
1166                         alias_span,
1167                         name: ident.to_string(),
1168                         value: String::new(),
1169                         parent,
1170                     });
1171                     self.write_sub_paths_truncated(&path);
1172                 }
1173             }
1174             ast::UseTreeKind::Glob => {
1175                 let path = ast::Path {
1176                     segments: prefix.segments
1177                         .iter()
1178                         .chain(path.segments.iter())
1179                         .cloned()
1180                         .collect(),
1181                     span: path.span,
1182                 };
1183
1184                 // Make a comma-separated list of names of imported modules.
1185                 let def_id = self.tcx.hir().local_def_id_from_node_id(id);
1186                 let names = self.tcx.names_imported_by_glob_use(def_id);
1187                 let names: Vec<_> = names.iter().map(|n| n.to_string()).collect();
1188
1189                 // Otherwise it's a span with wrong macro expansion info, which
1190                 // we don't want to track anyway, since it's probably macro-internal `use`
1191                 if let Some(sub_span) =
1192                     self.span.sub_span_of_token(use_tree.span, token::BinOp(token::Star))
1193                 {
1194                     if !self.span.filter_generated(use_tree.span) {
1195                         let span = self.span_from_span(sub_span);
1196
1197                         self.dumper.import(&access, Import {
1198                             kind: ImportKind::GlobUse,
1199                             ref_id: None,
1200                             span,
1201                             alias_span: None,
1202                             name: "*".to_owned(),
1203                             value: names.join(", "),
1204                             parent,
1205                         });
1206                         self.write_sub_paths(&path);
1207                     }
1208                 }
1209             }
1210             ast::UseTreeKind::Nested(ref nested_items) => {
1211                 let prefix = ast::Path {
1212                     segments: prefix.segments
1213                         .iter()
1214                         .chain(path.segments.iter())
1215                         .cloned()
1216                         .collect(),
1217                     span: path.span,
1218                 };
1219                 for &(ref tree, id) in nested_items {
1220                     self.process_use_tree(tree, id, root_item, &prefix);
1221                 }
1222             }
1223         }
1224     }
1225
1226     fn process_bounds(&mut self, bounds: &'l ast::GenericBounds) {
1227         for bound in bounds {
1228             if let ast::GenericBound::Trait(ref trait_ref, _) = *bound {
1229                 self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1230             }
1231         }
1232     }
1233 }
1234
1235 impl<'l, 'tcx> Visitor<'l> for DumpVisitor<'l, 'tcx> {
1236     fn visit_mod(&mut self, m: &'l ast::Mod, span: Span, attrs: &[ast::Attribute], id: NodeId) {
1237         // Since we handle explicit modules ourselves in visit_item, this should
1238         // only get called for the root module of a crate.
1239         assert_eq!(id, ast::CRATE_NODE_ID);
1240
1241         let qualname = format!("::{}",
1242             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(id)));
1243
1244         let cm = self.tcx.sess.source_map();
1245         let filename = cm.span_to_filename(span);
1246         let data_id = id_from_node_id(id, &self.save_ctxt);
1247         let children = m.items
1248             .iter()
1249             .map(|i| id_from_node_id(i.id, &self.save_ctxt))
1250             .collect();
1251         let span = self.span_from_span(span);
1252
1253         self.dumper.dump_def(
1254             &Access {
1255                 public: true,
1256                 reachable: true,
1257             },
1258             Def {
1259                 kind: DefKind::Mod,
1260                 id: data_id,
1261                 name: String::new(),
1262                 qualname,
1263                 span,
1264                 value: filename.to_string(),
1265                 children,
1266                 parent: None,
1267                 decl_id: None,
1268                 docs: self.save_ctxt.docs_for_attrs(attrs),
1269                 sig: None,
1270                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1271             },
1272         );
1273         visit::walk_mod(self, m);
1274     }
1275
1276     fn visit_item(&mut self, item: &'l ast::Item) {
1277         use syntax::ast::ItemKind::*;
1278         self.process_macro_use(item.span);
1279         match item.node {
1280             Use(ref use_tree) => {
1281                 let prefix = ast::Path {
1282                     segments: vec![],
1283                     span: DUMMY_SP,
1284                 };
1285                 self.process_use_tree(use_tree, item.id, item, &prefix);
1286             }
1287             ExternCrate(_) => {
1288                 let name_span = item.ident.span;
1289                 if !self.span.filter_generated(name_span) {
1290                     let span = self.span_from_span(name_span);
1291                     let parent = self.save_ctxt.tcx.hir().opt_local_def_id_from_node_id(item.id)
1292                         .and_then(|id| self.save_ctxt.tcx.parent(id))
1293                         .map(id_from_def_id);
1294                     self.dumper.import(
1295                         &Access {
1296                             public: false,
1297                             reachable: false,
1298                         },
1299                         Import {
1300                             kind: ImportKind::ExternCrate,
1301                             ref_id: None,
1302                             span,
1303                             alias_span: None,
1304                             name: item.ident.to_string(),
1305                             value: String::new(),
1306                             parent,
1307                         },
1308                     );
1309                 }
1310             }
1311             Fn(ref decl, .., ref ty_params, ref body) => {
1312                 self.process_fn(item, &decl, ty_params, &body)
1313             }
1314             Static(ref typ, _, ref expr) => self.process_static_or_const_item(item, typ, expr),
1315             Const(ref typ, ref expr) => self.process_static_or_const_item(item, &typ, &expr),
1316             Struct(ref def, ref ty_params) | Union(ref def, ref ty_params) => {
1317                 self.process_struct(item, def, ty_params)
1318             }
1319             Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1320             Impl(.., ref ty_params, ref trait_ref, ref typ, ref impl_items) => {
1321                 self.process_impl(item, ty_params, trait_ref, &typ, impl_items)
1322             }
1323             Trait(_, _, ref generics, ref trait_refs, ref methods) => {
1324                 self.process_trait(item, generics, trait_refs, methods)
1325             }
1326             Mod(ref m) => {
1327                 self.process_mod(item);
1328                 visit::walk_mod(self, m);
1329             }
1330             TyAlias(ref ty, ref ty_params) => {
1331                 let qualname = format!("::{}",
1332                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
1333                 let value = ty_to_string(&ty);
1334                 if !self.span.filter_generated(item.ident.span) {
1335                     let span = self.span_from_span(item.ident.span);
1336                     let id = id_from_node_id(item.id, &self.save_ctxt);
1337                     let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1338
1339                     self.dumper.dump_def(
1340                         &access_from!(self.save_ctxt, item, hir_id),
1341                         Def {
1342                             kind: DefKind::Type,
1343                             id,
1344                             span,
1345                             name: item.ident.to_string(),
1346                             qualname: qualname.clone(),
1347                             value,
1348                             parent: None,
1349                             children: vec![],
1350                             decl_id: None,
1351                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1352                             sig: sig::item_signature(item, &self.save_ctxt),
1353                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1354                         },
1355                     );
1356                 }
1357
1358                 self.visit_ty(&ty);
1359                 self.process_generic_params(ty_params, &qualname, item.id);
1360             }
1361             OpaqueTy(ref bounds, ref ty_params) => {
1362                 let qualname = format!("::{}",
1363                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
1364
1365                 let value = String::new();
1366                 if !self.span.filter_generated(item.ident.span) {
1367                     let span = self.span_from_span(item.ident.span);
1368                     let id = id_from_node_id(item.id, &self.save_ctxt);
1369                     let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1370
1371                     self.dumper.dump_def(
1372                         &access_from!(self.save_ctxt, item, hir_id),
1373                         Def {
1374                             kind: DefKind::Type,
1375                             id,
1376                             span,
1377                             name: item.ident.to_string(),
1378                             qualname: qualname.clone(),
1379                             value,
1380                             parent: None,
1381                             children: vec![],
1382                             decl_id: None,
1383                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1384                             sig: sig::item_signature(item, &self.save_ctxt),
1385                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1386                         },
1387                     );
1388                 }
1389
1390                 self.process_bounds(bounds);
1391                 self.process_generic_params(ty_params, &qualname, item.id);
1392             }
1393             Mac(_) => (),
1394             _ => visit::walk_item(self, item),
1395         }
1396     }
1397
1398     fn visit_generics(&mut self, generics: &'l ast::Generics) {
1399         for param in &generics.params {
1400             match param.kind {
1401                 ast::GenericParamKind::Lifetime { .. } => {}
1402                 ast::GenericParamKind::Type { ref default, .. } => {
1403                     self.process_bounds(&param.bounds);
1404                     if let Some(ref ty) = default {
1405                         self.visit_ty(&ty);
1406                     }
1407                 }
1408                 ast::GenericParamKind::Const { ref ty } => {
1409                     self.process_bounds(&param.bounds);
1410                     self.visit_ty(&ty);
1411                 }
1412             }
1413         }
1414         for pred in &generics.where_clause.predicates {
1415             if let ast::WherePredicate::BoundPredicate(ref wbp) = *pred {
1416                 self.process_bounds(&wbp.bounds);
1417                 self.visit_ty(&wbp.bounded_ty);
1418             }
1419         }
1420     }
1421
1422     fn visit_ty(&mut self, t: &'l ast::Ty) {
1423         self.process_macro_use(t.span);
1424         match t.node {
1425             ast::TyKind::Path(_, ref path) => {
1426                 if generated_code(t.span) {
1427                     return;
1428                 }
1429
1430                 if let Some(id) = self.lookup_def_id(t.id) {
1431                     let sub_span = path.segments.last().unwrap().ident.span;
1432                     let span = self.span_from_span(sub_span);
1433                     self.dumper.dump_ref(Ref {
1434                         kind: RefKind::Type,
1435                         span,
1436                         ref_id: id_from_def_id(id),
1437                     });
1438                 }
1439
1440                 self.write_sub_paths_truncated(path);
1441                 visit::walk_path(self, path);
1442             }
1443             ast::TyKind::Array(ref element, ref length) => {
1444                 self.visit_ty(element);
1445                 self.nest_tables(length.id, |v| v.visit_expr(&length.value));
1446             }
1447             ast::TyKind::ImplTrait(id, ref bounds) => {
1448                 // FIXME: As of writing, the opaque type lowering introduces
1449                 // another DefPath scope/segment (used to declare the resulting
1450                 // opaque type item).
1451                 // However, the synthetic scope does *not* have associated
1452                 // typeck tables, which means we can't nest it and we fire an
1453                 // assertion when resolving the qualified type paths in trait
1454                 // bounds...
1455                 // This will panic if called on return type `impl Trait`, which
1456                 // we guard against in `process_fn`.
1457                 self.nest_tables(id, |v| v.process_bounds(bounds));
1458             }
1459             _ => visit::walk_ty(self, t),
1460         }
1461     }
1462
1463     fn visit_expr(&mut self, ex: &'l ast::Expr) {
1464         debug!("visit_expr {:?}", ex.node);
1465         self.process_macro_use(ex.span);
1466         match ex.node {
1467             ast::ExprKind::Struct(ref path, ref fields, ref base) => {
1468                 let expr_hir_id = self.save_ctxt.tcx.hir().node_to_hir_id(ex.id);
1469                 let hir_expr = self.save_ctxt.tcx.hir().expect_expr(expr_hir_id);
1470                 let adt = match self.save_ctxt.tables.expr_ty_opt(&hir_expr) {
1471                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1472                     _ => {
1473                         visit::walk_expr(self, ex);
1474                         return;
1475                     }
1476                 };
1477                 let node_id = self.save_ctxt.tcx.hir().hir_to_node_id(hir_expr.hir_id);
1478                 let res = self.save_ctxt.get_path_res(node_id);
1479                 self.process_struct_lit(ex, path, fields, adt.variant_of_res(res), base)
1480             }
1481             ast::ExprKind::MethodCall(ref seg, ref args) => self.process_method_call(ex, seg, args),
1482             ast::ExprKind::Field(ref sub_ex, _) => {
1483                 self.visit_expr(&sub_ex);
1484
1485                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1486                     down_cast_data!(field_data, RefData, ex.span);
1487                     if !generated_code(ex.span) {
1488                         self.dumper.dump_ref(field_data);
1489                     }
1490                 }
1491             }
1492             ast::ExprKind::Closure(_, _, _, ref decl, ref body, _fn_decl_span) => {
1493                 let id = format!("${}", ex.id);
1494
1495                 // walk arg and return types
1496                 for arg in &decl.inputs {
1497                     self.visit_ty(&arg.ty);
1498                 }
1499
1500                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1501                     self.visit_ty(&ret_ty);
1502                 }
1503
1504                 // walk the body
1505                 self.nest_tables(ex.id, |v| {
1506                     v.process_formals(&decl.inputs, &id);
1507                     v.visit_expr(body)
1508                 });
1509             }
1510             ast::ExprKind::ForLoop(ref pattern, ref subexpression, ref block, _) => {
1511                 self.process_var_decl(pattern);
1512                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1513                 self.visit_expr(subexpression);
1514                 visit::walk_block(self, block);
1515             }
1516             ast::ExprKind::Let(ref pat, ref scrutinee) => {
1517                 self.process_var_decl(pat);
1518                 self.visit_expr(scrutinee);
1519             }
1520             ast::ExprKind::Repeat(ref element, ref count) => {
1521                 self.visit_expr(element);
1522                 self.nest_tables(count.id, |v| v.visit_expr(&count.value));
1523             }
1524             // In particular, we take this branch for call and path expressions,
1525             // where we'll index the idents involved just by continuing to walk.
1526             _ => visit::walk_expr(self, ex),
1527         }
1528     }
1529
1530     fn visit_mac(&mut self, mac: &'l ast::Mac) {
1531         // These shouldn't exist in the AST at this point, log a span bug.
1532         span_bug!(
1533             mac.span,
1534             "macro invocation should have been expanded out of AST"
1535         );
1536     }
1537
1538     fn visit_pat(&mut self, p: &'l ast::Pat) {
1539         self.process_macro_use(p.span);
1540         self.process_pat(p);
1541     }
1542
1543     fn visit_arm(&mut self, arm: &'l ast::Arm) {
1544         self.process_var_decl(&arm.pat);
1545         if let Some(expr) = &arm.guard {
1546             self.visit_expr(expr);
1547         }
1548         self.visit_expr(&arm.body);
1549     }
1550
1551     fn visit_path(&mut self, p: &'l ast::Path, id: NodeId) {
1552         self.process_path(id, p);
1553     }
1554
1555     fn visit_stmt(&mut self, s: &'l ast::Stmt) {
1556         self.process_macro_use(s.span);
1557         visit::walk_stmt(self, s)
1558     }
1559
1560     fn visit_local(&mut self, l: &'l ast::Local) {
1561         self.process_macro_use(l.span);
1562         self.process_var_decl(&l.pat);
1563
1564         // Just walk the initialiser and type (don't want to walk the pattern again).
1565         walk_list!(self, visit_ty, &l.ty);
1566         walk_list!(self, visit_expr, &l.init);
1567     }
1568
1569     fn visit_foreign_item(&mut self, item: &'l ast::ForeignItem) {
1570         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1571         let access = access_from!(self.save_ctxt, item, hir_id);
1572
1573         match item.node {
1574             ast::ForeignItemKind::Fn(ref decl, ref generics) => {
1575                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1576                     down_cast_data!(fn_data, DefData, item.span);
1577
1578                     self.process_generic_params(generics, &fn_data.qualname, item.id);
1579                     self.dumper.dump_def(&access, fn_data);
1580                 }
1581
1582                 for arg in &decl.inputs {
1583                     self.visit_ty(&arg.ty);
1584                 }
1585
1586                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1587                     self.visit_ty(&ret_ty);
1588                 }
1589             }
1590             ast::ForeignItemKind::Static(ref ty, _) => {
1591                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1592                     down_cast_data!(var_data, DefData, item.span);
1593                     self.dumper.dump_def(&access, var_data);
1594                 }
1595
1596                 self.visit_ty(ty);
1597             }
1598             ast::ForeignItemKind::Ty => {
1599                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1600                     down_cast_data!(var_data, DefData, item.span);
1601                     self.dumper.dump_def(&access, var_data);
1602                 }
1603             }
1604             ast::ForeignItemKind::Macro(..) => {}
1605         }
1606     }
1607 }