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::{Spanned, 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     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             }.to_string()
 141         });
 142
 143         let data = CratePreludeData {
 144             crate_id: GlobalCrateId {
 145                 name: name.into(),
 146                 disambiguator: self.tcx
 147                     .sess
 148                     .local_crate_disambiguator()
 149                     .to_fingerprint()
 150                     .as_value(),
 151             },
 152             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 153             external_crates: self.save_ctxt.get_external_crates(),
 154             span: self.span_from_span(krate.span),
 155         };
 156
 157         self.dumper.crate_prelude(data);
 158     }
 159
 160     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
 161         // Apply possible `remap-path-prefix` remapping to the input source file
 162         // (and don't include remapping args anymore)
 163         let (program, arguments) = {
 164             let remap_arg_indices = {
 165                 let mut indices = FxHashSet::default();
 166                 // Args are guaranteed to be valid UTF-8 (checked early)
 167                 for (i, e) in env::args().enumerate() {
 168                     if e.starts_with("--remap-path-prefix=") {
 169                         indices.insert(i);
 170                     } else if e == "--remap-path-prefix" {
 171                         indices.insert(i);
 172                         indices.insert(i + 1);
 173                     }
 174                 }
 175                 indices
 176             };
 177
 178             let mut args = env::args()
 179                 .enumerate()
 180                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 181                 .map(|(_, arg)| {
 182                     match input {
 183                         Input::File(ref path) if path == Path::new(&arg) => {
 184                             let mapped = &self.tcx.sess.local_crate_source_file;
 185                             mapped
 186                                 .as_ref()
 187                                 .unwrap()
 188                                 .to_string_lossy()
 189                                 .into()
 190                         },
 191                         _ => arg,
 192                     }
 193                 });
 194
 195             (args.next().unwrap(), args.collect())
 196         };
 197
 198         let data = CompilationOptions {
 199             directory: self.tcx.sess.working_dir.0.clone(),
 200             program,
 201             arguments,
 202             output: self.save_ctxt.compilation_output(crate_name),
 203         };
 204
 205         self.dumper.compilation_opts(data);
 206     }
 207
 208     fn write_sub_paths(&mut self, path: &ast::Path) {
 209         for seg in &path.segments {
 210             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 211                 self.dumper.dump_ref(data);
 212             }
 213         }
 214     }
 215
 216     // As write_sub_paths, but does not process the last ident in the path (assuming it
 217     // will be processed elsewhere). See note on write_sub_paths about global.
 218     fn write_sub_paths_truncated(&mut self, path: &ast::Path) {
 219         for seg in &path.segments[..path.segments.len() - 1] {
 220             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 221                 self.dumper.dump_ref(data);
 222             }
 223         }
 224     }
 225
 226     fn lookup_def_id(&self, ref_id: NodeId) -> Option<DefId> {
 227         match self.save_ctxt.get_path_res(ref_id) {
 228             Res::PrimTy(..) | Res::SelfTy(..) | Res::Err => None,
 229             def => Some(def.def_id()),
 230         }
 231     }
 232
 233     fn process_formals(&mut self, formals: &'l [ast::Arg], qualname: &str) {
 234         for arg in formals {
 235             self.visit_pat(&arg.pat);
 236             let mut collector = PathCollector::new();
 237             collector.visit_pat(&arg.pat);
 238
 239             for (id, ident, ..) in collector.collected_idents {
 240                 let hir_id = self.tcx.hir().node_to_hir_id(id);
 241                 let typ = match self.save_ctxt.tables.node_type_opt(hir_id) {
 242                     Some(s) => s.to_string(),
 243                     None => continue,
 244                 };
 245                 if !self.span.filter_generated(ident.span) {
 246                     let id = id_from_node_id(id, &self.save_ctxt);
 247                     let span = self.span_from_span(ident.span);
 248
 249                     self.dumper.dump_def(
 250                         &Access {
 251                             public: false,
 252                             reachable: false,
 253                         },
 254                         Def {
 255                             kind: DefKind::Local,
 256                             id,
 257                             span,
 258                             name: ident.to_string(),
 259                             qualname: format!("{}::{}", qualname, ident.to_string()),
 260                             value: typ,
 261                             parent: None,
 262                             children: vec![],
 263                             decl_id: None,
 264                             docs: String::new(),
 265                             sig: None,
 266                             attributes: vec![],
 267                         },
 268                     );
 269                 }
 270             }
 271         }
 272     }
 273
 274     fn process_method(
 275         &mut self,
 276         sig: &'l ast::MethodSig,
 277         body: Option<&'l ast::Block>,
 278         id: ast::NodeId,
 279         ident: ast::Ident,
 280         generics: &'l ast::Generics,
 281         vis: ast::Visibility,
 282         span: Span,
 283     ) {
 284         debug!("process_method: {}:{}", id, ident);
 285
 286         if let Some(mut method_data) = self.save_ctxt.get_method_data(id, ident, span) {
 287             let sig_str = crate::make_signature(&sig.decl, &generics);
 288             if body.is_some() {
 289                 self.nest_tables(
 290                     id,
 291                     |v| v.process_formals(&sig.decl.inputs, &method_data.qualname),
 292                 );
 293             }
 294
 295             self.process_generic_params(&generics, &method_data.qualname, id);
 296
 297             method_data.value = sig_str;
 298             method_data.sig = sig::method_signature(id, ident, generics, sig, &self.save_ctxt);
 299             let hir_id = self.tcx.hir().node_to_hir_id(id);
 300             self.dumper.dump_def(&access_from_vis!(self.save_ctxt, vis, hir_id), method_data);
 301         }
 302
 303         // walk arg and return types
 304         for arg in &sig.decl.inputs {
 305             self.visit_ty(&arg.ty);
 306         }
 307
 308         if let ast::FunctionRetTy::Ty(ref ret_ty) = sig.decl.output {
 309             self.visit_ty(ret_ty);
 310         }
 311
 312         // walk the fn body
 313         if let Some(body) = body {
 314             self.nest_tables(id, |v| v.visit_block(body));
 315         }
 316     }
 317
 318     fn process_struct_field_def(&mut self, field: &ast::StructField, parent_id: NodeId) {
 319         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 320         if let Some(field_data) = field_data {
 321             let hir_id = self.tcx.hir().node_to_hir_id(field.id);
 322             self.dumper.dump_def(&access_from!(self.save_ctxt, field, hir_id), field_data);
 323         }
 324     }
 325
 326     // Dump generic params bindings, then visit_generics
 327     fn process_generic_params(
 328         &mut self,
 329         generics: &'l ast::Generics,
 330         prefix: &str,
 331         id: NodeId,
 332     ) {
 333         for param in &generics.params {
 334             match param.kind {
 335                 ast::GenericParamKind::Lifetime { .. } => {}
 336                 ast::GenericParamKind::Type { .. } => {
 337                     let param_ss = param.ident.span;
 338                     let name = escape(self.span.snippet(param_ss));
 339                     // Append $id to name to make sure each one is unique.
 340                     let qualname = format!("{}::{}${}", prefix, name, id);
 341                     if !self.span.filter_generated(param_ss) {
 342                         let id = id_from_node_id(param.id, &self.save_ctxt);
 343                         let span = self.span_from_span(param_ss);
 344
 345                         self.dumper.dump_def(
 346                             &Access {
 347                                 public: false,
 348                                 reachable: false,
 349                             },
 350                             Def {
 351                                 kind: DefKind::Type,
 352                                 id,
 353                                 span,
 354                                 name,
 355                                 qualname,
 356                                 value: String::new(),
 357                                 parent: None,
 358                                 children: vec![],
 359                                 decl_id: None,
 360                                 docs: String::new(),
 361                                 sig: None,
 362                                 attributes: vec![],
 363                             },
 364                         );
 365                     }
 366                 }
 367                 ast::GenericParamKind::Const { .. } => {}
 368             }
 369         }
 370         self.visit_generics(generics);
 371     }
 372
 373     fn process_fn(
 374         &mut self,
 375         item: &'l ast::Item,
 376         decl: &'l ast::FnDecl,
 377         ty_params: &'l ast::Generics,
 378         body: &'l ast::Block,
 379     ) {
 380         if let Some(fn_data) = self.save_ctxt.get_item_data(item) {
 381             down_cast_data!(fn_data, DefData, item.span);
 382             self.nest_tables(
 383                 item.id,
 384                 |v| v.process_formals(&decl.inputs, &fn_data.qualname),
 385             );
 386             self.process_generic_params(ty_params, &fn_data.qualname, item.id);
 387             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 388             self.dumper.dump_def(&access_from!(self.save_ctxt, item, hir_id), fn_data);
 389         }
 390
 391         for arg in &decl.inputs {
 392             self.visit_ty(&arg.ty);
 393         }
 394
 395         if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
 396             self.visit_ty(&ret_ty);
 397         }
 398
 399         self.nest_tables(item.id, |v| v.visit_block(&body));
 400     }
 401
 402     fn process_static_or_const_item(
 403         &mut self,
 404         item: &'l ast::Item,
 405         typ: &'l ast::Ty,
 406         expr: &'l ast::Expr,
 407     ) {
 408         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 409         self.nest_tables(item.id, |v| {
 410             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 411                 down_cast_data!(var_data, DefData, item.span);
 412                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, hir_id), var_data);
 413             }
 414             v.visit_ty(&typ);
 415             v.visit_expr(expr);
 416         });
 417     }
 418
 419     fn process_assoc_const(
 420         &mut self,
 421         id: ast::NodeId,
 422         ident: ast::Ident,
 423         typ: &'l ast::Ty,
 424         expr: Option<&'l ast::Expr>,
 425         parent_id: DefId,
 426         vis: ast::Visibility,
 427         attrs: &'l [Attribute],
 428     ) {
 429         let qualname = format!("::{}",
 430             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(id)));
 431
 432         if !self.span.filter_generated(ident.span) {
 433             let sig = sig::assoc_const_signature(id, ident.name, typ, expr, &self.save_ctxt);
 434             let span = self.span_from_span(ident.span);
 435             let hir_id = self.tcx.hir().node_to_hir_id(id);
 436
 437             self.dumper.dump_def(
 438                 &access_from_vis!(self.save_ctxt, vis, hir_id),
 439                 Def {
 440                     kind: DefKind::Const,
 441                     id: id_from_node_id(id, &self.save_ctxt),
 442                     span,
 443                     name: ident.name.to_string(),
 444                     qualname,
 445                     value: ty_to_string(&typ),
 446                     parent: Some(id_from_def_id(parent_id)),
 447                     children: vec![],
 448                     decl_id: None,
 449                     docs: self.save_ctxt.docs_for_attrs(attrs),
 450                     sig,
 451                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 452                 },
 453             );
 454         }
 455
 456         // walk type and init value
 457         self.nest_tables(id, |v| {
 458             v.visit_ty(typ);
 459             if let Some(expr) = expr {
 460                 v.visit_expr(expr);
 461             }
 462         });
 463     }
 464
 465     // FIXME tuple structs should generate tuple-specific data.
 466     fn process_struct(
 467         &mut self,
 468         item: &'l ast::Item,
 469         def: &'l ast::VariantData,
 470         ty_params: &'l ast::Generics,
 471     ) {
 472         debug!("process_struct {:?} {:?}", item, item.span);
 473         let name = item.ident.to_string();
 474         let qualname = format!("::{}",
 475             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
 476
 477         let kind = match item.node {
 478             ast::ItemKind::Struct(_, _) => DefKind::Struct,
 479             ast::ItemKind::Union(_, _) => DefKind::Union,
 480             _ => unreachable!(),
 481         };
 482
 483         let (value, fields) = match item.node {
 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
 493                                 .map(|i| i.to_string())
 494                                 .or_else(|| Some(i.to_string()))
 495                         } else {
 496                             None
 497                         }
 498                     })
 499                     .collect::<Vec<_>>()
 500                     .join(", ");
 501                 let value = format!("{} {{ {} }}", name, fields_str);
 502                 (
 503                     value,
 504                     fields
 505                         .iter()
 506                         .map(|f| id_from_node_id(f.id, &self.save_ctxt))
 507                         .collect(),
 508                 )
 509             }
 510             _ => (String::new(), vec![]),
 511         };
 512
 513         if !self.span.filter_generated(item.ident.span) {
 514             let span = self.span_from_span(item.ident.span);
 515             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 516             self.dumper.dump_def(
 517                 &access_from!(self.save_ctxt, item, hir_id),
 518                 Def {
 519                     kind,
 520                     id: id_from_node_id(item.id, &self.save_ctxt),
 521                     span,
 522                     name,
 523                     qualname: qualname.clone(),
 524                     value,
 525                     parent: None,
 526                     children: fields,
 527                     decl_id: None,
 528                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 529                     sig: sig::item_signature(item, &self.save_ctxt),
 530                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 531                 },
 532             );
 533         }
 534
 535         for field in def.fields() {
 536             self.process_struct_field_def(field, item.id);
 537             self.visit_ty(&field.ty);
 538         }
 539
 540         self.process_generic_params(ty_params, &qualname, item.id);
 541     }
 542
 543     fn process_enum(
 544         &mut self,
 545         item: &'l ast::Item,
 546         enum_definition: &'l ast::EnumDef,
 547         ty_params: &'l ast::Generics,
 548     ) {
 549         let enum_data = self.save_ctxt.get_item_data(item);
 550         let enum_data = match enum_data {
 551             None => return,
 552             Some(data) => data,
 553         };
 554         down_cast_data!(enum_data, DefData, item.span);
 555
 556         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 557         let access = access_from!(self.save_ctxt, item, hir_id);
 558
 559         for variant in &enum_definition.variants {
 560             let name = variant.ident.name.to_string();
 561             let qualname = format!("{}::{}", enum_data.qualname, name);
 562             let name_span = variant.ident.span;
 563
 564             match variant.data {
 565                 ast::VariantData::Struct(ref fields, ..) => {
 566                     let fields_str = fields
 567                         .iter()
 568                         .enumerate()
 569                         .map(|(i, f)| {
 570                             f.ident.map(|i| i.to_string()).unwrap_or_else(|| i.to_string())
 571                         })
 572                         .collect::<Vec<_>>()
 573                         .join(", ");
 574                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 575                     if !self.span.filter_generated(name_span) {
 576                         let span = self.span_from_span(name_span);
 577                         let id = id_from_node_id(variant.id, &self.save_ctxt);
 578                         let parent = Some(id_from_node_id(item.id, &self.save_ctxt));
 579
 580                         self.dumper.dump_def(
 581                             &access,
 582                             Def {
 583                                 kind: DefKind::StructVariant,
 584                                 id,
 585                                 span,
 586                                 name,
 587                                 qualname,
 588                                 value,
 589                                 parent,
 590                                 children: vec![],
 591                                 decl_id: None,
 592                                 docs: self.save_ctxt.docs_for_attrs(&variant.attrs),
 593                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 594                                 attributes: lower_attributes(
 595                                     variant.attrs.clone(),
 596                                     &self.save_ctxt,
 597                                 ),
 598                             },
 599                         );
 600                     }
 601                 }
 602                 ref v => {
 603                     let mut value = format!("{}::{}", enum_data.name, name);
 604                     if let &ast::VariantData::Tuple(ref fields, _) = v {
 605                         value.push('(');
 606                         value.push_str(&fields
 607                             .iter()
 608                             .map(|f| ty_to_string(&f.ty))
 609                             .collect::<Vec<_>>()
 610                             .join(", "));
 611                         value.push(')');
 612                     }
 613                     if !self.span.filter_generated(name_span) {
 614                         let span = self.span_from_span(name_span);
 615                         let id = id_from_node_id(variant.id, &self.save_ctxt);
 616                         let parent = Some(id_from_node_id(item.id, &self.save_ctxt));
 617
 618                         self.dumper.dump_def(
 619                             &access,
 620                             Def {
 621                                 kind: DefKind::TupleVariant,
 622                                 id,
 623                                 span,
 624                                 name,
 625                                 qualname,
 626                                 value,
 627                                 parent,
 628                                 children: vec![],
 629                                 decl_id: None,
 630                                 docs: self.save_ctxt.docs_for_attrs(&variant.attrs),
 631                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 632                                 attributes: lower_attributes(
 633                                     variant.attrs.clone(),
 634                                     &self.save_ctxt,
 635                                 ),
 636                             },
 637                         );
 638                     }
 639                 }
 640             }
 641
 642
 643             for field in variant.data.fields() {
 644                 self.process_struct_field_def(field, variant.id);
 645                 self.visit_ty(&field.ty);
 646             }
 647         }
 648         self.process_generic_params(ty_params, &enum_data.qualname, item.id);
 649         self.dumper.dump_def(&access, enum_data);
 650     }
 651
 652     fn process_impl(
 653         &mut self,
 654         item: &'l ast::Item,
 655         generics: &'l ast::Generics,
 656         trait_ref: &'l Option<ast::TraitRef>,
 657         typ: &'l ast::Ty,
 658         impl_items: &'l [ast::ImplItem],
 659     ) {
 660         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 661             if !self.span.filter_generated(item.span) {
 662                 if let super::Data::RelationData(rel, imp) = impl_data {
 663                     self.dumper.dump_relation(rel);
 664                     self.dumper.dump_impl(imp);
 665                 } else {
 666                     span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 667                 }
 668             }
 669         }
 670         self.visit_ty(&typ);
 671         if let &Some(ref trait_ref) = trait_ref {
 672             self.process_path(trait_ref.ref_id, &trait_ref.path);
 673         }
 674         self.process_generic_params(generics, "", item.id);
 675         for impl_item in impl_items {
 676             let map = &self.tcx.hir();
 677             self.process_impl_item(impl_item, map.local_def_id_from_node_id(item.id));
 678         }
 679     }
 680
 681     fn process_trait(
 682         &mut self,
 683         item: &'l ast::Item,
 684         generics: &'l ast::Generics,
 685         trait_refs: &'l ast::GenericBounds,
 686         methods: &'l [ast::TraitItem],
 687     ) {
 688         let name = item.ident.to_string();
 689         let qualname = format!("::{}",
 690             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
 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
 703                 .iter()
 704                 .map(|i| id_from_node_id(i.id, &self.save_ctxt))
 705                 .collect();
 706             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 707             self.dumper.dump_def(
 708                 &access_from!(self.save_ctxt, item, hir_id),
 709                 Def {
 710                     kind: DefKind::Trait,
 711                     id,
 712                     span,
 713                     name,
 714                     qualname: qualname.clone(),
 715                     value: val,
 716                     parent: None,
 717                     children,
 718                     decl_id: None,
 719                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 720                     sig: sig::item_signature(item, &self.save_ctxt),
 721                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 722                 },
 723             );
 724         }
 725
 726         // super-traits
 727         for super_bound in trait_refs.iter() {
 728             let trait_ref = match *super_bound {
 729                 ast::GenericBound::Trait(ref trait_ref, _) => trait_ref,
 730                 ast::GenericBound::Outlives(..) => continue,
 731             };
 732
 733             let trait_ref = &trait_ref.trait_ref;
 734             if let Some(id) = self.lookup_def_id(trait_ref.ref_id) {
 735                 let sub_span = trait_ref.path.segments.last().unwrap().ident.span;
 736                 if !self.span.filter_generated(sub_span) {
 737                     let span = self.span_from_span(sub_span);
 738                     self.dumper.dump_ref(Ref {
 739                         kind: RefKind::Type,
 740                         span: span.clone(),
 741                         ref_id: id_from_def_id(id),
 742                     });
 743
 744                     self.dumper.dump_relation(Relation {
 745                         kind: RelationKind::SuperTrait,
 746                         span,
 747                         from: id_from_def_id(id),
 748                         to: id_from_node_id(item.id, &self.save_ctxt),
 749                     });
 750                 }
 751             }
 752         }
 753
 754         // walk generics and methods
 755         self.process_generic_params(generics, &qualname, item.id);
 756         for method in methods {
 757             let map = &self.tcx.hir();
 758             self.process_trait_item(method, map.local_def_id_from_node_id(item.id))
 759         }
 760     }
 761
 762     // `item` is the module in question, represented as an item.
 763     fn process_mod(&mut self, item: &ast::Item) {
 764         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 765             down_cast_data!(mod_data, DefData, item.span);
 766             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 767             self.dumper.dump_def(&access_from!(self.save_ctxt, item, hir_id), mod_data);
 768         }
 769     }
 770
 771     fn dump_path_ref(&mut self, id: NodeId, path: &ast::Path) {
 772         let path_data = self.save_ctxt.get_path_data(id, path);
 773         if let Some(path_data) = path_data {
 774             self.dumper.dump_ref(path_data);
 775         }
 776     }
 777
 778     fn process_path(&mut self, id: NodeId, path: &'l ast::Path) {
 779         if self.span.filter_generated(path.span) {
 780             return;
 781         }
 782         self.dump_path_ref(id, path);
 783
 784         // Type arguments
 785         for seg in &path.segments {
 786             if let Some(ref generic_args) = seg.args {
 787                 match **generic_args {
 788                     ast::GenericArgs::AngleBracketed(ref data) => {
 789                         for arg in &data.args {
 790                             match arg {
 791                                 ast::GenericArg::Type(ty) => self.visit_ty(ty),
 792                                 _ => {}
 793                             }
 794                         }
 795                     }
 796                     ast::GenericArgs::Parenthesized(ref data) => {
 797                         for t in &data.inputs {
 798                             self.visit_ty(t);
 799                         }
 800                         if let Some(ref t) = data.output {
 801                             self.visit_ty(t);
 802                         }
 803                     }
 804                 }
 805             }
 806         }
 807
 808         self.write_sub_paths_truncated(path);
 809     }
 810
 811     fn process_struct_lit(
 812         &mut self,
 813         ex: &'l ast::Expr,
 814         path: &'l ast::Path,
 815         fields: &'l [ast::Field],
 816         variant: &'l ty::VariantDef,
 817         base: &'l Option<P<ast::Expr>>,
 818     ) {
 819         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 820             self.write_sub_paths_truncated(path);
 821             down_cast_data!(struct_lit_data, RefData, ex.span);
 822             if !generated_code(ex.span) {
 823                 self.dumper.dump_ref(struct_lit_data);
 824             }
 825
 826             for field in fields {
 827                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 828                     self.dumper.dump_ref(field_data);
 829                 }
 830
 831                 self.visit_expr(&field.expr)
 832             }
 833         }
 834
 835         walk_list!(self, visit_expr, base);
 836     }
 837
 838     fn process_method_call(
 839         &mut self,
 840         ex: &'l ast::Expr,
 841         seg: &'l ast::PathSegment,
 842         args: &'l [P<ast::Expr>],
 843     ) {
 844         debug!("process_method_call {:?} {:?}", ex, ex.span);
 845         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 846             down_cast_data!(mcd, RefData, ex.span);
 847             if !generated_code(ex.span) {
 848                 self.dumper.dump_ref(mcd);
 849             }
 850         }
 851
 852         // Explicit types in the turbo-fish.
 853         if let Some(ref generic_args) = seg.args {
 854             if let ast::GenericArgs::AngleBracketed(ref data) = **generic_args {
 855                 for arg in &data.args {
 856                     match arg {
 857                         ast::GenericArg::Type(ty) => self.visit_ty(ty),
 858                         _ => {}
 859                     }
 860                 }
 861             }
 862         }
 863
 864         // walk receiver and args
 865         walk_list!(self, visit_expr, args);
 866     }
 867
 868     fn process_pat(&mut self, p: &'l ast::Pat) {
 869         match p.node {
 870             PatKind::Struct(ref _path, ref fields, _) => {
 871                 // FIXME do something with _path?
 872                 let hir_id = self.tcx.hir().node_to_hir_id(p.id);
 873                 let adt = match self.save_ctxt.tables.node_type_opt(hir_id) {
 874                     Some(ty) => ty.ty_adt_def().unwrap(),
 875                     None => {
 876                         visit::walk_pat(self, p);
 877                         return;
 878                     }
 879                 };
 880                 let variant = adt.variant_of_res(self.save_ctxt.get_path_res(p.id));
 881
 882                 for &Spanned { node: ref field, .. } in fields {
 883                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 884                         if !self.span.filter_generated(field.ident.span) {
 885                             let span = self.span_from_span(field.ident.span);
 886                             self.dumper.dump_ref(Ref {
 887                                 kind: RefKind::Variable,
 888                                 span,
 889                                 ref_id: id_from_def_id(variant.fields[index].did),
 890                             });
 891                         }
 892                     }
 893                     self.visit_pat(&field.pat);
 894                 }
 895             }
 896             _ => visit::walk_pat(self, p),
 897         }
 898     }
 899
 900     fn process_var_decl_multi(&mut self, pats: &'l [P<ast::Pat>]) {
 901         let mut collector = PathCollector::new();
 902         for pattern in pats {
 903             // collect paths from the arm's patterns
 904             collector.visit_pat(&pattern);
 905             self.visit_pat(&pattern);
 906         }
 907
 908         // process collected paths
 909         for (id, ident, immut) in collector.collected_idents {
 910             match self.save_ctxt.get_path_res(id) {
 911                 Res::Local(hir_id) => {
 912                     let mut value = if immut == ast::Mutability::Immutable {
 913                         self.span.snippet(ident.span)
 914                     } else {
 915                         "<mutable>".to_owned()
 916                     };
 917                     let id = self.tcx.hir().hir_to_node_id(hir_id);
 918                     let typ = self.save_ctxt
 919                         .tables
 920                         .node_type_opt(hir_id)
 921                         .map(|t| t.to_string())
 922                         .unwrap_or_default();
 923                     value.push_str(": ");
 924                     value.push_str(&typ);
 925
 926                     if !self.span.filter_generated(ident.span) {
 927                         let qualname = format!("{}${}", ident.to_string(), id);
 928                         let id = id_from_node_id(id, &self.save_ctxt);
 929                         let span = self.span_from_span(ident.span);
 930
 931                         self.dumper.dump_def(
 932                             &Access {
 933                                 public: false,
 934                                 reachable: false,
 935                             },
 936                             Def {
 937                                 kind: DefKind::Local,
 938                                 id,
 939                                 span,
 940                                 name: ident.to_string(),
 941                                 qualname,
 942                                 value: typ,
 943                                 parent: None,
 944                                 children: vec![],
 945                                 decl_id: None,
 946                                 docs: String::new(),
 947                                 sig: None,
 948                                 attributes: vec![],
 949                             },
 950                         );
 951                     }
 952                 }
 953                 Res::Def(HirDefKind::Ctor(..), _) |
 954                 Res::Def(HirDefKind::Const, _) |
 955                 Res::Def(HirDefKind::AssocConst, _) |
 956                 Res::Def(HirDefKind::Struct, _) |
 957                 Res::Def(HirDefKind::Variant, _) |
 958                 Res::Def(HirDefKind::TyAlias, _) |
 959                 Res::Def(HirDefKind::AssocTy, _) |
 960                 Res::SelfTy(..) => {
 961                     self.dump_path_ref(id, &ast::Path::from_ident(ident));
 962                 }
 963                 def => error!(
 964                     "unexpected definition kind when processing collected idents: {:?}",
 965                     def
 966                 ),
 967             }
 968         }
 969
 970         for (id, ref path) in collector.collected_paths {
 971             self.process_path(id, path);
 972         }
 973     }
 974
 975     fn process_var_decl(&mut self, p: &'l ast::Pat, value: String) {
 976         // The local could declare multiple new vars, we must walk the
 977         // pattern and collect them all.
 978         let mut collector = PathCollector::new();
 979         collector.visit_pat(&p);
 980         self.visit_pat(&p);
 981
 982         for (id, ident, immut) in collector.collected_idents {
 983             let mut value = match immut {
 984                 ast::Mutability::Immutable => value.to_string(),
 985                 _ => String::new(),
 986             };
 987             let hir_id = self.tcx.hir().node_to_hir_id(id);
 988             let typ = match self.save_ctxt.tables.node_type_opt(hir_id) {
 989                 Some(typ) => {
 990                     let typ = typ.to_string();
 991                     if !value.is_empty() {
 992                         value.push_str(": ");
 993                     }
 994                     value.push_str(&typ);
 995                     typ
 996                 }
 997                 None => String::new(),
 998             };
 999
1000             // Rust uses the id of the pattern for var lookups, so we'll use it too.
1001             if !self.span.filter_generated(ident.span) {
1002                 let qualname = format!("{}${}", ident.to_string(), id);
1003                 let id = id_from_node_id(id, &self.save_ctxt);
1004                 let span = self.span_from_span(ident.span);
1005
1006                 self.dumper.dump_def(
1007                     &Access {
1008                         public: false,
1009                         reachable: false,
1010                     },
1011                     Def {
1012                         kind: DefKind::Local,
1013                         id,
1014                         span,
1015                         name: ident.to_string(),
1016                         qualname,
1017                         value: typ,
1018                         parent: None,
1019                         children: vec![],
1020                         decl_id: None,
1021                         docs: String::new(),
1022                         sig: None,
1023                         attributes: vec![],
1024                     },
1025                 );
1026             }
1027         }
1028     }
1029
1030     /// Extracts macro use and definition information from the AST node defined
1031     /// by the given NodeId, using the expansion information from the node's
1032     /// span.
1033     ///
1034     /// If the span is not macro-generated, do nothing, else use callee and
1035     /// callsite spans to record macro definition and use data, using the
1036     /// mac_uses and mac_defs sets to prevent multiples.
1037     fn process_macro_use(&mut self, _span: Span) {
1038         // FIXME if we're not dumping the defs (see below), there is no point
1039         // dumping refs either.
1040         // let source_span = span.source_callsite();
1041         // if !self.macro_calls.insert(source_span) {
1042         //     return;
1043         // }
1044
1045         // let data = match self.save_ctxt.get_macro_use_data(span) {
1046         //     None => return,
1047         //     Some(data) => data,
1048         // };
1049
1050         // self.dumper.macro_use(data);
1051
1052         // FIXME write the macro def
1053         // let mut hasher = DefaultHasher::new();
1054         // data.callee_span.hash(&mut hasher);
1055         // let hash = hasher.finish();
1056         // let qualname = format!("{}::{}", data.name, hash);
1057         // Don't write macro definition for imported macros
1058         // if !self.mac_defs.contains(&data.callee_span)
1059         //     && !data.imported {
1060         //     self.mac_defs.insert(data.callee_span);
1061         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
1062         //         self.dumper.macro_data(MacroData {
1063         //             span: sub_span,
1064         //             name: data.name.clone(),
1065         //             qualname: qualname.clone(),
1066         //             // FIXME where do macro docs come from?
1067         //             docs: String::new(),
1068         //         }.lower(self.tcx));
1069         //     }
1070         // }
1071     }
1072
1073     fn process_trait_item(&mut self, trait_item: &'l ast::TraitItem, trait_id: DefId) {
1074         self.process_macro_use(trait_item.span);
1075         let vis_span = trait_item.span.shrink_to_lo();
1076         match trait_item.node {
1077             ast::TraitItemKind::Const(ref ty, ref expr) => {
1078                 self.process_assoc_const(
1079                     trait_item.id,
1080                     trait_item.ident,
1081                     &ty,
1082                     expr.as_ref().map(|e| &**e),
1083                     trait_id,
1084                     respan(vis_span, ast::VisibilityKind::Public),
1085                     &trait_item.attrs,
1086                 );
1087             }
1088             ast::TraitItemKind::Method(ref sig, ref body) => {
1089                 self.process_method(
1090                     sig,
1091                     body.as_ref().map(|x| &**x),
1092                     trait_item.id,
1093                     trait_item.ident,
1094                     &trait_item.generics,
1095                     respan(vis_span, ast::VisibilityKind::Public),
1096                     trait_item.span,
1097                 );
1098             }
1099             ast::TraitItemKind::Type(ref bounds, ref default_ty) => {
1100                 // FIXME do something with _bounds (for type refs)
1101                 let name = trait_item.ident.name.to_string();
1102                 let qualname = format!("::{}",
1103                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(trait_item.id)));
1104
1105                 if !self.span.filter_generated(trait_item.ident.span) {
1106                     let span = self.span_from_span(trait_item.ident.span);
1107                     let id = id_from_node_id(trait_item.id, &self.save_ctxt);
1108
1109                     self.dumper.dump_def(
1110                         &Access {
1111                             public: true,
1112                             reachable: true,
1113                         },
1114                         Def {
1115                             kind: DefKind::Type,
1116                             id,
1117                             span,
1118                             name,
1119                             qualname,
1120                             value: self.span.snippet(trait_item.span),
1121                             parent: Some(id_from_def_id(trait_id)),
1122                             children: vec![],
1123                             decl_id: None,
1124                             docs: self.save_ctxt.docs_for_attrs(&trait_item.attrs),
1125                             sig: sig::assoc_type_signature(
1126                                 trait_item.id,
1127                                 trait_item.ident,
1128                                 Some(bounds),
1129                                 default_ty.as_ref().map(|ty| &**ty),
1130                                 &self.save_ctxt,
1131                             ),
1132                             attributes: lower_attributes(trait_item.attrs.clone(), &self.save_ctxt),
1133                         },
1134                     );
1135                 }
1136
1137                 if let &Some(ref default_ty) = default_ty {
1138                     self.visit_ty(default_ty)
1139                 }
1140             }
1141             ast::TraitItemKind::Macro(_) => {}
1142         }
1143     }
1144
1145     fn process_impl_item(&mut self, impl_item: &'l ast::ImplItem, impl_id: DefId) {
1146         self.process_macro_use(impl_item.span);
1147         match impl_item.node {
1148             ast::ImplItemKind::Const(ref ty, ref expr) => {
1149                 self.process_assoc_const(
1150                     impl_item.id,
1151                     impl_item.ident,
1152                     &ty,
1153                     Some(expr),
1154                     impl_id,
1155                     impl_item.vis.clone(),
1156                     &impl_item.attrs,
1157                 );
1158             }
1159             ast::ImplItemKind::Method(ref sig, ref body) => {
1160                 self.process_method(
1161                     sig,
1162                     Some(body),
1163                     impl_item.id,
1164                     impl_item.ident,
1165                     &impl_item.generics,
1166                     impl_item.vis.clone(),
1167                     impl_item.span,
1168                 );
1169             }
1170             ast::ImplItemKind::TyAlias(ref ty) => {
1171                 // FIXME: uses of the assoc type should ideally point to this
1172                 // 'def' and the name here should be a ref to the def in the
1173                 // trait.
1174                 self.visit_ty(ty)
1175             }
1176             ast::ImplItemKind::OpaqueTy(ref bounds) => {
1177                 // FIXME: uses of the assoc type should ideally point to this
1178                 // 'def' and the name here should be a ref to the def in the
1179                 // trait.
1180                 for bound in bounds.iter() {
1181                     if let ast::GenericBound::Trait(trait_ref, _) = bound {
1182                         self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1183                     }
1184                 }
1185             }
1186             ast::ImplItemKind::Macro(_) => {}
1187         }
1188     }
1189
1190     /// Dumps imports in a use tree recursively.
1191     ///
1192     /// A use tree is an import that may contain nested braces (RFC 2128). The `use_tree` parameter
1193     /// is the current use tree under scrutiny, while `id` and `prefix` are its corresponding node
1194     /// ID and path. `root_item` is the topmost use tree in the hierarchy.
1195     ///
1196     /// If `use_tree` is a simple or glob import, it is dumped into the analysis data. Otherwise,
1197     /// each child use tree is dumped recursively.
1198     fn process_use_tree(&mut self,
1199                          use_tree: &'l ast::UseTree,
1200                          id: NodeId,
1201                          root_item: &'l ast::Item,
1202                          prefix: &ast::Path) {
1203         let path = &use_tree.prefix;
1204
1205         // The access is calculated using the current tree ID, but with the root tree's visibility
1206         // (since nested trees don't have their own visibility).
1207         let hir_id = self.tcx.hir().node_to_hir_id(id);
1208         let access = access_from!(self.save_ctxt, root_item, hir_id);
1209
1210         // The parent `DefId` of a given use tree is always the enclosing item.
1211         let parent = self.save_ctxt.tcx.hir().opt_local_def_id_from_node_id(id)
1212             .and_then(|id| self.save_ctxt.tcx.parent(id))
1213             .map(id_from_def_id);
1214
1215         match use_tree.kind {
1216             ast::UseTreeKind::Simple(alias, ..) => {
1217                 let ident = use_tree.ident();
1218                 let path = ast::Path {
1219                     segments: prefix.segments
1220                         .iter()
1221                         .chain(path.segments.iter())
1222                         .cloned()
1223                         .collect(),
1224                     span: path.span,
1225                 };
1226
1227                 let sub_span = path.segments.last().unwrap().ident.span;
1228                 if !self.span.filter_generated(sub_span) {
1229                     let ref_id = self.lookup_def_id(id).map(|id| id_from_def_id(id));
1230                     let alias_span = alias.map(|i| self.span_from_span(i.span));
1231                     let span = self.span_from_span(sub_span);
1232                     self.dumper.import(&access, Import {
1233                         kind: ImportKind::Use,
1234                         ref_id,
1235                         span,
1236                         alias_span,
1237                         name: ident.to_string(),
1238                         value: String::new(),
1239                         parent,
1240                     });
1241                     self.write_sub_paths_truncated(&path);
1242                 }
1243             }
1244             ast::UseTreeKind::Glob => {
1245                 let path = ast::Path {
1246                     segments: prefix.segments
1247                         .iter()
1248                         .chain(path.segments.iter())
1249                         .cloned()
1250                         .collect(),
1251                     span: path.span,
1252                 };
1253
1254                 // Make a comma-separated list of names of imported modules.
1255                 let def_id = self.tcx.hir().local_def_id_from_node_id(id);
1256                 let names = self.tcx.names_imported_by_glob_use(def_id);
1257                 let names: Vec<_> = names.iter().map(|n| n.to_string()).collect();
1258
1259                 // Otherwise it's a span with wrong macro expansion info, which
1260                 // we don't want to track anyway, since it's probably macro-internal `use`
1261                 if let Some(sub_span) =
1262                     self.span.sub_span_of_token(use_tree.span, token::BinOp(token::Star))
1263                 {
1264                     if !self.span.filter_generated(use_tree.span) {
1265                         let span = self.span_from_span(sub_span);
1266
1267                         self.dumper.import(&access, Import {
1268                             kind: ImportKind::GlobUse,
1269                             ref_id: None,
1270                             span,
1271                             alias_span: None,
1272                             name: "*".to_owned(),
1273                             value: names.join(", "),
1274                             parent,
1275                         });
1276                         self.write_sub_paths(&path);
1277                     }
1278                 }
1279             }
1280             ast::UseTreeKind::Nested(ref nested_items) => {
1281                 let prefix = ast::Path {
1282                     segments: prefix.segments
1283                         .iter()
1284                         .chain(path.segments.iter())
1285                         .cloned()
1286                         .collect(),
1287                     span: path.span,
1288                 };
1289                 for &(ref tree, id) in nested_items {
1290                     self.process_use_tree(tree, id, root_item, &prefix);
1291                 }
1292             }
1293         }
1294     }
1295
1296     fn process_bounds(&mut self, bounds: &'l ast::GenericBounds) {
1297         for bound in bounds {
1298             if let ast::GenericBound::Trait(ref trait_ref, _) = *bound {
1299                 self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1300             }
1301         }
1302     }
1303 }
1304
1305 impl<'l, 'tcx> Visitor<'l> for DumpVisitor<'l, 'tcx> {
1306     fn visit_mod(&mut self, m: &'l ast::Mod, span: Span, attrs: &[ast::Attribute], id: NodeId) {
1307         // Since we handle explicit modules ourselves in visit_item, this should
1308         // only get called for the root module of a crate.
1309         assert_eq!(id, ast::CRATE_NODE_ID);
1310
1311         let qualname = format!("::{}",
1312             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(id)));
1313
1314         let cm = self.tcx.sess.source_map();
1315         let filename = cm.span_to_filename(span);
1316         let data_id = id_from_node_id(id, &self.save_ctxt);
1317         let children = m.items
1318             .iter()
1319             .map(|i| id_from_node_id(i.id, &self.save_ctxt))
1320             .collect();
1321         let span = self.span_from_span(span);
1322
1323         self.dumper.dump_def(
1324             &Access {
1325                 public: true,
1326                 reachable: true,
1327             },
1328             Def {
1329                 kind: DefKind::Mod,
1330                 id: data_id,
1331                 name: String::new(),
1332                 qualname,
1333                 span,
1334                 value: filename.to_string(),
1335                 children,
1336                 parent: None,
1337                 decl_id: None,
1338                 docs: self.save_ctxt.docs_for_attrs(attrs),
1339                 sig: None,
1340                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1341             },
1342         );
1343         visit::walk_mod(self, m);
1344     }
1345
1346     fn visit_item(&mut self, item: &'l ast::Item) {
1347         use syntax::ast::ItemKind::*;
1348         self.process_macro_use(item.span);
1349         match item.node {
1350             Use(ref use_tree) => {
1351                 let prefix = ast::Path {
1352                     segments: vec![],
1353                     span: DUMMY_SP,
1354                 };
1355                 self.process_use_tree(use_tree, item.id, item, &prefix);
1356             }
1357             ExternCrate(_) => {
1358                 let name_span = item.ident.span;
1359                 if !self.span.filter_generated(name_span) {
1360                     let span = self.span_from_span(name_span);
1361                     let parent = self.save_ctxt.tcx.hir().opt_local_def_id_from_node_id(item.id)
1362                         .and_then(|id| self.save_ctxt.tcx.parent(id))
1363                         .map(id_from_def_id);
1364                     self.dumper.import(
1365                         &Access {
1366                             public: false,
1367                             reachable: false,
1368                         },
1369                         Import {
1370                             kind: ImportKind::ExternCrate,
1371                             ref_id: None,
1372                             span,
1373                             alias_span: None,
1374                             name: item.ident.to_string(),
1375                             value: String::new(),
1376                             parent,
1377                         },
1378                     );
1379                 }
1380             }
1381             Fn(ref decl, .., ref ty_params, ref body) => {
1382                 self.process_fn(item, &decl, ty_params, &body)
1383             }
1384             Static(ref typ, _, ref expr) => self.process_static_or_const_item(item, typ, expr),
1385             Const(ref typ, ref expr) => self.process_static_or_const_item(item, &typ, &expr),
1386             Struct(ref def, ref ty_params) | Union(ref def, ref ty_params) => {
1387                 self.process_struct(item, def, ty_params)
1388             }
1389             Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1390             Impl(.., ref ty_params, ref trait_ref, ref typ, ref impl_items) => {
1391                 self.process_impl(item, ty_params, trait_ref, &typ, impl_items)
1392             }
1393             Trait(_, _, ref generics, ref trait_refs, ref methods) => {
1394                 self.process_trait(item, generics, trait_refs, methods)
1395             }
1396             Mod(ref m) => {
1397                 self.process_mod(item);
1398                 visit::walk_mod(self, m);
1399             }
1400             TyAlias(ref ty, ref ty_params) => {
1401                 let qualname = format!("::{}",
1402                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
1403                 let value = ty_to_string(&ty);
1404                 if !self.span.filter_generated(item.ident.span) {
1405                     let span = self.span_from_span(item.ident.span);
1406                     let id = id_from_node_id(item.id, &self.save_ctxt);
1407                     let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1408
1409                     self.dumper.dump_def(
1410                         &access_from!(self.save_ctxt, item, hir_id),
1411                         Def {
1412                             kind: DefKind::Type,
1413                             id,
1414                             span,
1415                             name: item.ident.to_string(),
1416                             qualname: qualname.clone(),
1417                             value,
1418                             parent: None,
1419                             children: vec![],
1420                             decl_id: None,
1421                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1422                             sig: sig::item_signature(item, &self.save_ctxt),
1423                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1424                         },
1425                     );
1426                 }
1427
1428                 self.visit_ty(&ty);
1429                 self.process_generic_params(ty_params, &qualname, item.id);
1430             }
1431             OpaqueTy(ref _bounds, ref ty_params) => {
1432                 let qualname = format!("::{}",
1433                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id)));
1434                 // FIXME do something with _bounds
1435                 let value = String::new();
1436                 if !self.span.filter_generated(item.ident.span) {
1437                     let span = self.span_from_span(item.ident.span);
1438                     let id = id_from_node_id(item.id, &self.save_ctxt);
1439                     let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1440
1441                     self.dumper.dump_def(
1442                         &access_from!(self.save_ctxt, item, hir_id),
1443                         Def {
1444                             kind: DefKind::Type,
1445                             id,
1446                             span,
1447                             name: item.ident.to_string(),
1448                             qualname: qualname.clone(),
1449                             value,
1450                             parent: None,
1451                             children: vec![],
1452                             decl_id: None,
1453                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1454                             sig: sig::item_signature(item, &self.save_ctxt),
1455                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1456                         },
1457                     );
1458                 }
1459
1460                 self.process_generic_params(ty_params, &qualname, item.id);
1461             }
1462             Mac(_) => (),
1463             _ => visit::walk_item(self, item),
1464         }
1465     }
1466
1467     fn visit_generics(&mut self, generics: &'l ast::Generics) {
1468         for param in &generics.params {
1469             match param.kind {
1470                 ast::GenericParamKind::Lifetime { .. } => {}
1471                 ast::GenericParamKind::Type { ref default, .. } => {
1472                     self.process_bounds(&param.bounds);
1473                     if let Some(ref ty) = default {
1474                         self.visit_ty(&ty);
1475                     }
1476                 }
1477                 ast::GenericParamKind::Const { ref ty } => {
1478                     self.process_bounds(&param.bounds);
1479                     self.visit_ty(&ty);
1480                 }
1481             }
1482         }
1483         for pred in &generics.where_clause.predicates {
1484             if let ast::WherePredicate::BoundPredicate(ref wbp) = *pred {
1485                 self.process_bounds(&wbp.bounds);
1486                 self.visit_ty(&wbp.bounded_ty);
1487             }
1488         }
1489     }
1490
1491     fn visit_ty(&mut self, t: &'l ast::Ty) {
1492         self.process_macro_use(t.span);
1493         match t.node {
1494             ast::TyKind::Path(_, ref path) => {
1495                 if generated_code(t.span) {
1496                     return;
1497                 }
1498
1499                 if let Some(id) = self.lookup_def_id(t.id) {
1500                     let sub_span = path.segments.last().unwrap().ident.span;
1501                     let span = self.span_from_span(sub_span);
1502                     self.dumper.dump_ref(Ref {
1503                         kind: RefKind::Type,
1504                         span,
1505                         ref_id: id_from_def_id(id),
1506                     });
1507                 }
1508
1509                 self.write_sub_paths_truncated(path);
1510                 visit::walk_path(self, path);
1511             }
1512             ast::TyKind::Array(ref element, ref length) => {
1513                 self.visit_ty(element);
1514                 self.nest_tables(length.id, |v| v.visit_expr(&length.value));
1515             }
1516             _ => visit::walk_ty(self, t),
1517         }
1518     }
1519
1520     fn visit_expr(&mut self, ex: &'l ast::Expr) {
1521         debug!("visit_expr {:?}", ex.node);
1522         self.process_macro_use(ex.span);
1523         match ex.node {
1524             ast::ExprKind::Struct(ref path, ref fields, ref base) => {
1525                 let expr_hir_id = self.save_ctxt.tcx.hir().node_to_hir_id(ex.id);
1526                 let hir_expr = self.save_ctxt.tcx.hir().expect_expr(expr_hir_id);
1527                 let adt = match self.save_ctxt.tables.expr_ty_opt(&hir_expr) {
1528                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1529                     _ => {
1530                         visit::walk_expr(self, ex);
1531                         return;
1532                     }
1533                 };
1534                 let node_id = self.save_ctxt.tcx.hir().hir_to_node_id(hir_expr.hir_id);
1535                 let res = self.save_ctxt.get_path_res(node_id);
1536                 self.process_struct_lit(ex, path, fields, adt.variant_of_res(res), base)
1537             }
1538             ast::ExprKind::MethodCall(ref seg, ref args) => self.process_method_call(ex, seg, args),
1539             ast::ExprKind::Field(ref sub_ex, _) => {
1540                 self.visit_expr(&sub_ex);
1541
1542                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1543                     down_cast_data!(field_data, RefData, ex.span);
1544                     if !generated_code(ex.span) {
1545                         self.dumper.dump_ref(field_data);
1546                     }
1547                 }
1548             }
1549             ast::ExprKind::Closure(_, _, _, ref decl, ref body, _fn_decl_span) => {
1550                 let id = format!("${}", ex.id);
1551
1552                 // walk arg and return types
1553                 for arg in &decl.inputs {
1554                     self.visit_ty(&arg.ty);
1555                 }
1556
1557                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1558                     self.visit_ty(&ret_ty);
1559                 }
1560
1561                 // walk the body
1562                 self.nest_tables(ex.id, |v| {
1563                     v.process_formals(&decl.inputs, &id);
1564                     v.visit_expr(body)
1565                 });
1566             }
1567             ast::ExprKind::ForLoop(ref pattern, ref subexpression, ref block, _) => {
1568                 let value = self.span.snippet(subexpression.span);
1569                 self.process_var_decl(pattern, value);
1570                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1571                 self.visit_expr(subexpression);
1572                 visit::walk_block(self, block);
1573             }
1574             ast::ExprKind::Let(ref pats, ref scrutinee) => {
1575                 self.process_var_decl_multi(pats);
1576                 self.visit_expr(scrutinee);
1577             }
1578             ast::ExprKind::Repeat(ref element, ref count) => {
1579                 self.visit_expr(element);
1580                 self.nest_tables(count.id, |v| v.visit_expr(&count.value));
1581             }
1582             // In particular, we take this branch for call and path expressions,
1583             // where we'll index the idents involved just by continuing to walk.
1584             _ => visit::walk_expr(self, ex),
1585         }
1586     }
1587
1588     fn visit_mac(&mut self, mac: &'l ast::Mac) {
1589         // These shouldn't exist in the AST at this point, log a span bug.
1590         span_bug!(
1591             mac.span,
1592             "macro invocation should have been expanded out of AST"
1593         );
1594     }
1595
1596     fn visit_pat(&mut self, p: &'l ast::Pat) {
1597         self.process_macro_use(p.span);
1598         self.process_pat(p);
1599     }
1600
1601     fn visit_arm(&mut self, arm: &'l ast::Arm) {
1602         self.process_var_decl_multi(&arm.pats);
1603         if let Some(expr) = &arm.guard {
1604             self.visit_expr(expr);
1605         }
1606         self.visit_expr(&arm.body);
1607     }
1608
1609     fn visit_path(&mut self, p: &'l ast::Path, id: NodeId) {
1610         self.process_path(id, p);
1611     }
1612
1613     fn visit_stmt(&mut self, s: &'l ast::Stmt) {
1614         self.process_macro_use(s.span);
1615         visit::walk_stmt(self, s)
1616     }
1617
1618     fn visit_local(&mut self, l: &'l ast::Local) {
1619         self.process_macro_use(l.span);
1620         let value = l.init
1621             .as_ref()
1622             .map(|i| self.span.snippet(i.span))
1623             .unwrap_or_default();
1624         self.process_var_decl(&l.pat, value);
1625
1626         // Just walk the initialiser and type (don't want to walk the pattern again).
1627         walk_list!(self, visit_ty, &l.ty);
1628         walk_list!(self, visit_expr, &l.init);
1629     }
1630
1631     fn visit_foreign_item(&mut self, item: &'l ast::ForeignItem) {
1632         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1633         let access = access_from!(self.save_ctxt, item, hir_id);
1634
1635         match item.node {
1636             ast::ForeignItemKind::Fn(ref decl, ref generics) => {
1637                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1638                     down_cast_data!(fn_data, DefData, item.span);
1639
1640                     self.process_generic_params(generics, &fn_data.qualname, item.id);
1641                     self.dumper.dump_def(&access, fn_data);
1642                 }
1643
1644                 for arg in &decl.inputs {
1645                     self.visit_ty(&arg.ty);
1646                 }
1647
1648                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1649                     self.visit_ty(&ret_ty);
1650                 }
1651             }
1652             ast::ForeignItemKind::Static(ref ty, _) => {
1653                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1654                     down_cast_data!(var_data, DefData, item.span);
1655                     self.dumper.dump_def(&access, var_data);
1656                 }
1657
1658                 self.visit_ty(ty);
1659             }
1660             ast::ForeignItemKind::Ty => {
1661                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1662                     down_cast_data!(var_data, DefData, item.span);
1663                     self.dumper.dump_def(&access, var_data);
1664                 }
1665             }
1666             ast::ForeignItemKind::Macro(..) => {}
1667         }
1668     }
1669 }