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