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::session::config::Input;
  17 use rustc::span_bug;
  18 use rustc::ty::{self, DefIdTree, TyCtxt};
  19 use rustc_ast_pretty::pprust::{bounds_to_string, generic_params_to_string, ty_to_string};
  20 use rustc_data_structures::fx::FxHashSet;
  21 use rustc_hir::def::{DefKind as HirDefKind, Res};
  22 use rustc_hir::def_id::DefId;
  23 use rustc_span::source_map::{respan, DUMMY_SP};
  24 use rustc_span::*;
  25 use syntax::ast::{self, Attribute, NodeId, PatKind};
  26 use syntax::ptr::P;
  27 use syntax::token;
  28 use syntax::visit::{self, Visitor};
  29 use syntax::walk_list;
  30
  31 use std::env;
  32 use std::path::Path;
  33
  34 use crate::dumper::{Access, Dumper};
  35 use crate::sig;
  36 use crate::span_utils::SpanUtils;
  37 use crate::{
  38     escape, generated_code, id_from_def_id, id_from_node_id, lower_attributes, PathCollector,
  39     SaveContext,
  40 };
  41
  42 use rls_data::{
  43     CompilationOptions, CratePreludeData, Def, DefKind, GlobalCrateId, Import, ImportKind, Ref,
  44     RefKind, Relation, RelationKind, SpanData,
  45 };
  46
  47 use log::{debug, error};
  48
  49 macro_rules! down_cast_data {
  50     ($id:ident, $kind:ident, $sp:expr) => {
  51         let $id = if let super::Data::$kind(data) = $id {
  52             data
  53         } else {
  54             span_bug!($sp, "unexpected data kind: {:?}", $id);
  55         };
  56     };
  57 }
  58
  59 macro_rules! access_from {
  60     ($save_ctxt:expr, $item:expr, $id:expr) => {
  61         Access {
  62             public: $item.vis.node.is_pub(),
  63             reachable: $save_ctxt.access_levels.is_reachable($id),
  64         }
  65     };
  66 }
  67
  68 macro_rules! access_from_vis {
  69     ($save_ctxt:expr, $vis:expr, $id:expr) => {
  70         Access { public: $vis.node.is_pub(), reachable: $save_ctxt.access_levels.is_reachable($id) }
  71     };
  72 }
  73
  74 pub struct DumpVisitor<'l, 'tcx> {
  75     pub save_ctxt: SaveContext<'l, 'tcx>,
  76     tcx: TyCtxt<'tcx>,
  77     dumper: Dumper,
  78
  79     span: SpanUtils<'l>,
  80     // Set of macro definition (callee) spans, and the set
  81     // of macro use (callsite) spans. We store these to ensure
  82     // we only write one macro def per unique macro definition, and
  83     // one macro use per unique callsite span.
  84     // mac_defs: FxHashSet<Span>,
  85     // macro_calls: FxHashSet<Span>,
  86 }
  87
  88 impl<'l, 'tcx> DumpVisitor<'l, 'tcx> {
  89     pub fn new(save_ctxt: SaveContext<'l, 'tcx>) -> DumpVisitor<'l, 'tcx> {
  90         let span_utils = SpanUtils::new(&save_ctxt.tcx.sess);
  91         let dumper = Dumper::new(save_ctxt.config.clone());
  92         DumpVisitor {
  93             tcx: save_ctxt.tcx,
  94             save_ctxt,
  95             dumper,
  96             span: span_utils,
  97             // mac_defs: FxHashSet::default(),
  98             // macro_calls: FxHashSet::default(),
  99         }
 100     }
 101
 102     pub fn analysis(&self) -> &rls_data::Analysis {
 103         self.dumper.analysis()
 104     }
 105
 106     fn nest_tables<F>(&mut self, item_id: NodeId, f: F)
 107     where
 108         F: FnOnce(&mut Self),
 109     {
 110         let item_def_id = self.tcx.hir().local_def_id_from_node_id(item_id);
 111
 112         let tables = if self.tcx.has_typeck_tables(item_def_id) {
 113             self.tcx.typeck_tables_of(item_def_id)
 114         } else {
 115             self.save_ctxt.empty_tables
 116         };
 117
 118         let old_tables = self.save_ctxt.tables;
 119         self.save_ctxt.tables = tables;
 120         f(self);
 121         self.save_ctxt.tables = old_tables;
 122     }
 123
 124     fn span_from_span(&self, span: Span) -> SpanData {
 125         self.save_ctxt.span_from_span(span)
 126     }
 127
 128     fn lookup_def_id(&self, ref_id: NodeId) -> Option<DefId> {
 129         self.save_ctxt.lookup_def_id(ref_id)
 130     }
 131
 132     pub fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
 133         let source_file = self.tcx.sess.local_crate_source_file.as_ref();
 134         let crate_root = source_file.map(|source_file| {
 135             let source_file = Path::new(source_file);
 136             match source_file.file_name() {
 137                 Some(_) => source_file.parent().unwrap().display(),
 138                 None => source_file.display(),
 139             }
 140             .to_string()
 141         });
 142
 143         let data = CratePreludeData {
 144             crate_id: GlobalCrateId {
 145                 name: name.into(),
 146                 disambiguator: self
 147                     .tcx
 148                     .sess
 149                     .local_crate_disambiguator()
 150                     .to_fingerprint()
 151                     .as_value(),
 152             },
 153             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 154             external_crates: self.save_ctxt.get_external_crates(),
 155             span: self.span_from_span(krate.span),
 156         };
 157
 158         self.dumper.crate_prelude(data);
 159     }
 160
 161     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
 162         // Apply possible `remap-path-prefix` remapping to the input source file
 163         // (and don't include remapping args anymore)
 164         let (program, arguments) = {
 165             let remap_arg_indices = {
 166                 let mut indices = FxHashSet::default();
 167                 // Args are guaranteed to be valid UTF-8 (checked early)
 168                 for (i, e) in env::args().enumerate() {
 169                     if e.starts_with("--remap-path-prefix=") {
 170                         indices.insert(i);
 171                     } else if e == "--remap-path-prefix" {
 172                         indices.insert(i);
 173                         indices.insert(i + 1);
 174                     }
 175                 }
 176                 indices
 177             };
 178
 179             let mut args = env::args()
 180                 .enumerate()
 181                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 182                 .map(|(_, arg)| match input {
 183                     Input::File(ref path) if path == Path::new(&arg) => {
 184                         let mapped = &self.tcx.sess.local_crate_source_file;
 185                         mapped.as_ref().unwrap().to_string_lossy().into()
 186                     }
 187                     _ => arg,
 188                 });
 189
 190             (args.next().unwrap(), args.collect())
 191         };
 192
 193         let data = CompilationOptions {
 194             directory: self.tcx.sess.working_dir.0.clone(),
 195             program,
 196             arguments,
 197             output: self.save_ctxt.compilation_output(crate_name),
 198         };
 199
 200         self.dumper.compilation_opts(data);
 201     }
 202
 203     fn write_sub_paths(&mut self, path: &ast::Path) {
 204         for seg in &path.segments {
 205             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 206                 self.dumper.dump_ref(data);
 207             }
 208         }
 209     }
 210
 211     // As write_sub_paths, but does not process the last ident in the path (assuming it
 212     // will be processed elsewhere). See note on write_sub_paths about global.
 213     fn write_sub_paths_truncated(&mut self, path: &ast::Path) {
 214         for seg in &path.segments[..path.segments.len() - 1] {
 215             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 216                 self.dumper.dump_ref(data);
 217             }
 218         }
 219     }
 220
 221     fn process_formals(&mut self, formals: &'l [ast::Param], qualname: &str) {
 222         for arg in formals {
 223             self.visit_pat(&arg.pat);
 224             let mut collector = PathCollector::new();
 225             collector.visit_pat(&arg.pat);
 226
 227             for (id, ident, ..) in collector.collected_idents {
 228                 let hir_id = self.tcx.hir().node_to_hir_id(id);
 229                 let typ = match self.save_ctxt.tables.node_type_opt(hir_id) {
 230                     Some(s) => s.to_string(),
 231                     None => continue,
 232                 };
 233                 if !self.span.filter_generated(ident.span) {
 234                     let id = id_from_node_id(id, &self.save_ctxt);
 235                     let span = self.span_from_span(ident.span);
 236
 237                     self.dumper.dump_def(
 238                         &Access { public: false, reachable: false },
 239                         Def {
 240                             kind: DefKind::Local,
 241                             id,
 242                             span,
 243                             name: ident.to_string(),
 244                             qualname: format!("{}::{}", qualname, ident.to_string()),
 245                             value: typ,
 246                             parent: None,
 247                             children: vec![],
 248                             decl_id: None,
 249                             docs: String::new(),
 250                             sig: None,
 251                             attributes: vec![],
 252                         },
 253                     );
 254                 }
 255             }
 256         }
 257     }
 258
 259     fn process_method(
 260         &mut self,
 261         sig: &'l ast::FnSig,
 262         body: Option<&'l ast::Block>,
 263         id: ast::NodeId,
 264         ident: ast::Ident,
 265         generics: &'l ast::Generics,
 266         vis: ast::Visibility,
 267         span: Span,
 268     ) {
 269         debug!("process_method: {}:{}", id, ident);
 270
 271         let hir_id = self.tcx.hir().node_to_hir_id(id);
 272         self.nest_tables(id, |v| {
 273             if let Some(mut method_data) = v.save_ctxt.get_method_data(id, ident, span) {
 274                 v.process_formals(&sig.decl.inputs, &method_data.qualname);
 275                 v.process_generic_params(&generics, &method_data.qualname, id);
 276
 277                 method_data.value = crate::make_signature(&sig.decl, &generics);
 278                 method_data.sig = sig::method_signature(id, ident, generics, sig, &v.save_ctxt);
 279
 280                 v.dumper.dump_def(&access_from_vis!(v.save_ctxt, vis, hir_id), method_data);
 281             }
 282
 283             // walk arg and return types
 284             for arg in &sig.decl.inputs {
 285                 v.visit_ty(&arg.ty);
 286             }
 287
 288             if let ast::FnRetTy::Ty(ref ret_ty) = sig.decl.output {
 289                 // In async functions, return types are desugared and redefined
 290                 // as an `impl Trait` existential type. Because of this, to match
 291                 // the definition paths when resolving nested types we need to
 292                 // start walking from the newly-created definition.
 293                 match sig.header.asyncness {
 294                     ast::Async::Yes { return_impl_trait_id, .. } => {
 295                         v.nest_tables(return_impl_trait_id, |v| v.visit_ty(ret_ty))
 296                     }
 297                     _ => v.visit_ty(ret_ty),
 298                 }
 299             }
 300
 301             // walk the fn body
 302             if let Some(body) = body {
 303                 v.visit_block(body);
 304             }
 305         });
 306     }
 307
 308     fn process_struct_field_def(&mut self, field: &ast::StructField, parent_id: NodeId) {
 309         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 310         if let Some(field_data) = field_data {
 311             let hir_id = self.tcx.hir().node_to_hir_id(field.id);
 312             self.dumper.dump_def(&access_from!(self.save_ctxt, field, hir_id), field_data);
 313         }
 314     }
 315
 316     // Dump generic params bindings, then visit_generics
 317     fn process_generic_params(&mut self, generics: &'l ast::Generics, prefix: &str, id: NodeId) {
 318         for param in &generics.params {
 319             match param.kind {
 320                 ast::GenericParamKind::Lifetime { .. } => {}
 321                 ast::GenericParamKind::Type { .. } => {
 322                     let param_ss = param.ident.span;
 323                     let name = escape(self.span.snippet(param_ss));
 324                     // Append $id to name to make sure each one is unique.
 325                     let qualname = format!("{}::{}${}", prefix, name, id);
 326                     if !self.span.filter_generated(param_ss) {
 327                         let id = id_from_node_id(param.id, &self.save_ctxt);
 328                         let span = self.span_from_span(param_ss);
 329
 330                         self.dumper.dump_def(
 331                             &Access { public: false, reachable: false },
 332                             Def {
 333                                 kind: DefKind::Type,
 334                                 id,
 335                                 span,
 336                                 name,
 337                                 qualname,
 338                                 value: String::new(),
 339                                 parent: None,
 340                                 children: vec![],
 341                                 decl_id: None,
 342                                 docs: String::new(),
 343                                 sig: None,
 344                                 attributes: vec![],
 345                             },
 346                         );
 347                     }
 348                 }
 349                 ast::GenericParamKind::Const { .. } => {}
 350             }
 351         }
 352         self.visit_generics(generics);
 353     }
 354
 355     fn process_fn(
 356         &mut self,
 357         item: &'l ast::Item,
 358         decl: &'l ast::FnDecl,
 359         header: &'l ast::FnHeader,
 360         ty_params: &'l ast::Generics,
 361         body: Option<&'l ast::Block>,
 362     ) {
 363         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 364         self.nest_tables(item.id, |v| {
 365             if let Some(fn_data) = v.save_ctxt.get_item_data(item) {
 366                 down_cast_data!(fn_data, DefData, item.span);
 367                 v.process_formals(&decl.inputs, &fn_data.qualname);
 368                 v.process_generic_params(ty_params, &fn_data.qualname, item.id);
 369
 370                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, hir_id), fn_data);
 371             }
 372
 373             for arg in &decl.inputs {
 374                 v.visit_ty(&arg.ty)
 375             }
 376
 377             if let ast::FnRetTy::Ty(ref ret_ty) = decl.output {
 378                 if let ast::TyKind::ImplTrait(..) = ret_ty.kind {
 379                     // FIXME: Opaque type desugaring prevents us from easily
 380                     // processing trait bounds. See `visit_ty` for more details.
 381                 } else {
 382                     // In async functions, return types are desugared and redefined
 383                     // as an `impl Trait` existential type. Because of this, to match
 384                     // the definition paths when resolving nested types we need to
 385                     // start walking from the newly-created definition.
 386                     match header.asyncness {
 387                         ast::Async::Yes { return_impl_trait_id, .. } => {
 388                             v.nest_tables(return_impl_trait_id, |v| v.visit_ty(ret_ty))
 389                         }
 390                         _ => v.visit_ty(ret_ty),
 391                     }
 392                 }
 393             }
 394
 395             walk_list!(v, visit_block, body);
 396         });
 397     }
 398
 399     fn process_static_or_const_item(
 400         &mut self,
 401         item: &'l ast::Item,
 402         typ: &'l ast::Ty,
 403         expr: Option<&'l ast::Expr>,
 404     ) {
 405         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 406         self.nest_tables(item.id, |v| {
 407             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 408                 down_cast_data!(var_data, DefData, item.span);
 409                 v.dumper.dump_def(&access_from!(v.save_ctxt, item, hir_id), var_data);
 410             }
 411             v.visit_ty(&typ);
 412             walk_list!(v, visit_expr, expr);
 413         });
 414     }
 415
 416     fn process_assoc_const(
 417         &mut self,
 418         id: ast::NodeId,
 419         ident: ast::Ident,
 420         typ: &'l ast::Ty,
 421         expr: Option<&'l ast::Expr>,
 422         parent_id: DefId,
 423         vis: ast::Visibility,
 424         attrs: &'l [Attribute],
 425     ) {
 426         let qualname =
 427             format!("::{}", self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(id)));
 428
 429         if !self.span.filter_generated(ident.span) {
 430             let sig = sig::assoc_const_signature(id, ident.name, typ, expr, &self.save_ctxt);
 431             let span = self.span_from_span(ident.span);
 432             let hir_id = self.tcx.hir().node_to_hir_id(id);
 433
 434             self.dumper.dump_def(
 435                 &access_from_vis!(self.save_ctxt, vis, hir_id),
 436                 Def {
 437                     kind: DefKind::Const,
 438                     id: id_from_node_id(id, &self.save_ctxt),
 439                     span,
 440                     name: ident.name.to_string(),
 441                     qualname,
 442                     value: ty_to_string(&typ),
 443                     parent: Some(id_from_def_id(parent_id)),
 444                     children: vec![],
 445                     decl_id: None,
 446                     docs: self.save_ctxt.docs_for_attrs(attrs),
 447                     sig,
 448                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 449                 },
 450             );
 451         }
 452
 453         // walk type and init value
 454         self.nest_tables(id, |v| {
 455             v.visit_ty(typ);
 456             if let Some(expr) = expr {
 457                 v.visit_expr(expr);
 458             }
 459         });
 460     }
 461
 462     // FIXME tuple structs should generate tuple-specific data.
 463     fn process_struct(
 464         &mut self,
 465         item: &'l ast::Item,
 466         def: &'l ast::VariantData,
 467         ty_params: &'l ast::Generics,
 468     ) {
 469         debug!("process_struct {:?} {:?}", item, item.span);
 470         let name = item.ident.to_string();
 471         let qualname = format!(
 472             "::{}",
 473             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id))
 474         );
 475
 476         let kind = match item.kind {
 477             ast::ItemKind::Struct(_, _) => DefKind::Struct,
 478             ast::ItemKind::Union(_, _) => DefKind::Union,
 479             _ => unreachable!(),
 480         };
 481
 482         let (value, fields) = match item.kind {
 483             ast::ItemKind::Struct(ast::VariantData::Struct(ref fields, ..), ..)
 484             | ast::ItemKind::Union(ast::VariantData::Struct(ref fields, ..), ..) => {
 485                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 486                 let fields_str = fields
 487                     .iter()
 488                     .enumerate()
 489                     .filter_map(|(i, f)| {
 490                         if include_priv_fields || f.vis.node.is_pub() {
 491                             f.ident.map(|i| i.to_string()).or_else(|| Some(i.to_string()))
 492                         } else {
 493                             None
 494                         }
 495                     })
 496                     .collect::<Vec<_>>()
 497                     .join(", ");
 498                 let value = format!("{} {{ {} }}", name, fields_str);
 499                 (value, fields.iter().map(|f| id_from_node_id(f.id, &self.save_ctxt)).collect())
 500             }
 501             _ => (String::new(), vec![]),
 502         };
 503
 504         if !self.span.filter_generated(item.ident.span) {
 505             let span = self.span_from_span(item.ident.span);
 506             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 507             self.dumper.dump_def(
 508                 &access_from!(self.save_ctxt, item, hir_id),
 509                 Def {
 510                     kind,
 511                     id: id_from_node_id(item.id, &self.save_ctxt),
 512                     span,
 513                     name,
 514                     qualname: qualname.clone(),
 515                     value,
 516                     parent: None,
 517                     children: fields,
 518                     decl_id: None,
 519                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 520                     sig: sig::item_signature(item, &self.save_ctxt),
 521                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 522                 },
 523             );
 524         }
 525
 526         self.nest_tables(item.id, |v| {
 527             for field in def.fields() {
 528                 v.process_struct_field_def(field, item.id);
 529                 v.visit_ty(&field.ty);
 530             }
 531
 532             v.process_generic_params(ty_params, &qualname, item.id);
 533         });
 534     }
 535
 536     fn process_enum(
 537         &mut self,
 538         item: &'l ast::Item,
 539         enum_definition: &'l ast::EnumDef,
 540         ty_params: &'l ast::Generics,
 541     ) {
 542         let enum_data = self.save_ctxt.get_item_data(item);
 543         let enum_data = match enum_data {
 544             None => return,
 545             Some(data) => data,
 546         };
 547         down_cast_data!(enum_data, DefData, item.span);
 548
 549         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 550         let access = access_from!(self.save_ctxt, item, hir_id);
 551
 552         for variant in &enum_definition.variants {
 553             let name = variant.ident.name.to_string();
 554             let qualname = format!("{}::{}", enum_data.qualname, name);
 555             let name_span = variant.ident.span;
 556
 557             match variant.data {
 558                 ast::VariantData::Struct(ref fields, ..) => {
 559                     let fields_str = fields
 560                         .iter()
 561                         .enumerate()
 562                         .map(|(i, f)| {
 563                             f.ident.map(|i| i.to_string()).unwrap_or_else(|| i.to_string())
 564                         })
 565                         .collect::<Vec<_>>()
 566                         .join(", ");
 567                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 568                     if !self.span.filter_generated(name_span) {
 569                         let span = self.span_from_span(name_span);
 570                         let id = id_from_node_id(variant.id, &self.save_ctxt);
 571                         let parent = Some(id_from_node_id(item.id, &self.save_ctxt));
 572
 573                         self.dumper.dump_def(
 574                             &access,
 575                             Def {
 576                                 kind: DefKind::StructVariant,
 577                                 id,
 578                                 span,
 579                                 name,
 580                                 qualname,
 581                                 value,
 582                                 parent,
 583                                 children: vec![],
 584                                 decl_id: None,
 585                                 docs: self.save_ctxt.docs_for_attrs(&variant.attrs),
 586                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 587                                 attributes: lower_attributes(
 588                                     variant.attrs.clone(),
 589                                     &self.save_ctxt,
 590                                 ),
 591                             },
 592                         );
 593                     }
 594                 }
 595                 ref v => {
 596                     let mut value = format!("{}::{}", enum_data.name, name);
 597                     if let &ast::VariantData::Tuple(ref fields, _) = v {
 598                         value.push('(');
 599                         value.push_str(
 600                             &fields
 601                                 .iter()
 602                                 .map(|f| ty_to_string(&f.ty))
 603                                 .collect::<Vec<_>>()
 604                                 .join(", "),
 605                         );
 606                         value.push(')');
 607                     }
 608                     if !self.span.filter_generated(name_span) {
 609                         let span = self.span_from_span(name_span);
 610                         let id = id_from_node_id(variant.id, &self.save_ctxt);
 611                         let parent = Some(id_from_node_id(item.id, &self.save_ctxt));
 612
 613                         self.dumper.dump_def(
 614                             &access,
 615                             Def {
 616                                 kind: DefKind::TupleVariant,
 617                                 id,
 618                                 span,
 619                                 name,
 620                                 qualname,
 621                                 value,
 622                                 parent,
 623                                 children: vec![],
 624                                 decl_id: None,
 625                                 docs: self.save_ctxt.docs_for_attrs(&variant.attrs),
 626                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 627                                 attributes: lower_attributes(
 628                                     variant.attrs.clone(),
 629                                     &self.save_ctxt,
 630                                 ),
 631                             },
 632                         );
 633                     }
 634                 }
 635             }
 636
 637             for field in variant.data.fields() {
 638                 self.process_struct_field_def(field, variant.id);
 639                 self.visit_ty(&field.ty);
 640             }
 641         }
 642         self.process_generic_params(ty_params, &enum_data.qualname, item.id);
 643         self.dumper.dump_def(&access, enum_data);
 644     }
 645
 646     fn process_impl(
 647         &mut self,
 648         item: &'l ast::Item,
 649         generics: &'l ast::Generics,
 650         trait_ref: &'l Option<ast::TraitRef>,
 651         typ: &'l ast::Ty,
 652         impl_items: &'l [P<ast::AssocItem>],
 653     ) {
 654         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 655             if !self.span.filter_generated(item.span) {
 656                 if let super::Data::RelationData(rel, imp) = impl_data {
 657                     self.dumper.dump_relation(rel);
 658                     self.dumper.dump_impl(imp);
 659                 } else {
 660                     span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 661                 }
 662             }
 663         }
 664
 665         let map = &self.tcx.hir();
 666         self.nest_tables(item.id, |v| {
 667             v.visit_ty(&typ);
 668             if let &Some(ref trait_ref) = trait_ref {
 669                 v.process_path(trait_ref.ref_id, &trait_ref.path);
 670             }
 671             v.process_generic_params(generics, "", item.id);
 672             for impl_item in impl_items {
 673                 v.process_impl_item(impl_item, map.local_def_id_from_node_id(item.id));
 674             }
 675         });
 676     }
 677
 678     fn process_trait(
 679         &mut self,
 680         item: &'l ast::Item,
 681         generics: &'l ast::Generics,
 682         trait_refs: &'l ast::GenericBounds,
 683         methods: &'l [P<ast::AssocItem>],
 684     ) {
 685         let name = item.ident.to_string();
 686         let qualname = format!(
 687             "::{}",
 688             self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id))
 689         );
 690         let mut val = name.clone();
 691         if !generics.params.is_empty() {
 692             val.push_str(&generic_params_to_string(&generics.params));
 693         }
 694         if !trait_refs.is_empty() {
 695             val.push_str(": ");
 696             val.push_str(&bounds_to_string(trait_refs));
 697         }
 698         if !self.span.filter_generated(item.ident.span) {
 699             let id = id_from_node_id(item.id, &self.save_ctxt);
 700             let span = self.span_from_span(item.ident.span);
 701             let children = methods.iter().map(|i| id_from_node_id(i.id, &self.save_ctxt)).collect();
 702             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 703             self.dumper.dump_def(
 704                 &access_from!(self.save_ctxt, item, hir_id),
 705                 Def {
 706                     kind: DefKind::Trait,
 707                     id,
 708                     span,
 709                     name,
 710                     qualname: qualname.clone(),
 711                     value: val,
 712                     parent: None,
 713                     children,
 714                     decl_id: None,
 715                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 716                     sig: sig::item_signature(item, &self.save_ctxt),
 717                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 718                 },
 719             );
 720         }
 721
 722         // super-traits
 723         for super_bound in trait_refs.iter() {
 724             let trait_ref = match *super_bound {
 725                 ast::GenericBound::Trait(ref trait_ref, _) => trait_ref,
 726                 ast::GenericBound::Outlives(..) => continue,
 727             };
 728
 729             let trait_ref = &trait_ref.trait_ref;
 730             if let Some(id) = self.lookup_def_id(trait_ref.ref_id) {
 731                 let sub_span = trait_ref.path.segments.last().unwrap().ident.span;
 732                 if !self.span.filter_generated(sub_span) {
 733                     let span = self.span_from_span(sub_span);
 734                     self.dumper.dump_ref(Ref {
 735                         kind: RefKind::Type,
 736                         span: span.clone(),
 737                         ref_id: id_from_def_id(id),
 738                     });
 739
 740                     self.dumper.dump_relation(Relation {
 741                         kind: RelationKind::SuperTrait,
 742                         span,
 743                         from: id_from_def_id(id),
 744                         to: id_from_node_id(item.id, &self.save_ctxt),
 745                     });
 746                 }
 747             }
 748         }
 749
 750         // walk generics and methods
 751         self.process_generic_params(generics, &qualname, item.id);
 752         for method in methods {
 753             let map = &self.tcx.hir();
 754             self.process_trait_item(method, map.local_def_id_from_node_id(item.id))
 755         }
 756     }
 757
 758     // `item` is the module in question, represented as an item.
 759     fn process_mod(&mut self, item: &ast::Item) {
 760         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 761             down_cast_data!(mod_data, DefData, item.span);
 762             let hir_id = self.tcx.hir().node_to_hir_id(item.id);
 763             self.dumper.dump_def(&access_from!(self.save_ctxt, item, hir_id), mod_data);
 764         }
 765     }
 766
 767     fn dump_path_ref(&mut self, id: NodeId, path: &ast::Path) {
 768         let path_data = self.save_ctxt.get_path_data(id, path);
 769         if let Some(path_data) = path_data {
 770             self.dumper.dump_ref(path_data);
 771         }
 772     }
 773
 774     fn process_path(&mut self, id: NodeId, path: &'l ast::Path) {
 775         if self.span.filter_generated(path.span) {
 776             return;
 777         }
 778         self.dump_path_ref(id, path);
 779
 780         // Type arguments
 781         for seg in &path.segments {
 782             if let Some(ref generic_args) = seg.args {
 783                 match **generic_args {
 784                     ast::GenericArgs::AngleBracketed(ref data) => {
 785                         for arg in &data.args {
 786                             if let ast::GenericArg::Type(ty) = arg {
 787                                 self.visit_ty(ty);
 788                             }
 789                         }
 790                     }
 791                     ast::GenericArgs::Parenthesized(ref data) => {
 792                         for t in &data.inputs {
 793                             self.visit_ty(t);
 794                         }
 795                         if let ast::FnRetTy::Ty(ty) = &data.output {
 796                             self.visit_ty(ty);
 797                         }
 798                     }
 799                 }
 800             }
 801         }
 802
 803         self.write_sub_paths_truncated(path);
 804     }
 805
 806     fn process_struct_lit(
 807         &mut self,
 808         ex: &'l ast::Expr,
 809         path: &'l ast::Path,
 810         fields: &'l [ast::Field],
 811         variant: &'l ty::VariantDef,
 812         base: &'l Option<P<ast::Expr>>,
 813     ) {
 814         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 815             self.write_sub_paths_truncated(path);
 816             down_cast_data!(struct_lit_data, RefData, ex.span);
 817             if !generated_code(ex.span) {
 818                 self.dumper.dump_ref(struct_lit_data);
 819             }
 820
 821             for field in fields {
 822                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 823                     self.dumper.dump_ref(field_data);
 824                 }
 825
 826                 self.visit_expr(&field.expr)
 827             }
 828         }
 829
 830         walk_list!(self, visit_expr, base);
 831     }
 832
 833     fn process_method_call(
 834         &mut self,
 835         ex: &'l ast::Expr,
 836         seg: &'l ast::PathSegment,
 837         args: &'l [P<ast::Expr>],
 838     ) {
 839         debug!("process_method_call {:?} {:?}", ex, ex.span);
 840         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 841             down_cast_data!(mcd, RefData, ex.span);
 842             if !generated_code(ex.span) {
 843                 self.dumper.dump_ref(mcd);
 844             }
 845         }
 846
 847         // Explicit types in the turbo-fish.
 848         if let Some(ref generic_args) = seg.args {
 849             if let ast::GenericArgs::AngleBracketed(ref data) = **generic_args {
 850                 for arg in &data.args {
 851                     match arg {
 852                         ast::GenericArg::Type(ty) => self.visit_ty(ty),
 853                         _ => {}
 854                     }
 855                 }
 856             }
 857         }
 858
 859         // walk receiver and args
 860         walk_list!(self, visit_expr, args);
 861     }
 862
 863     fn process_pat(&mut self, p: &'l ast::Pat) {
 864         match p.kind {
 865             PatKind::Struct(ref _path, ref fields, _) => {
 866                 // FIXME do something with _path?
 867                 let hir_id = self.tcx.hir().node_to_hir_id(p.id);
 868                 let adt = match self.save_ctxt.tables.node_type_opt(hir_id) {
 869                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
 870                     _ => {
 871                         visit::walk_pat(self, p);
 872                         return;
 873                     }
 874                 };
 875                 let variant = adt.variant_of_res(self.save_ctxt.get_path_res(p.id));
 876
 877                 for field in fields {
 878                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 879                         if !self.span.filter_generated(field.ident.span) {
 880                             let span = self.span_from_span(field.ident.span);
 881                             self.dumper.dump_ref(Ref {
 882                                 kind: RefKind::Variable,
 883                                 span,
 884                                 ref_id: id_from_def_id(variant.fields[index].did),
 885                             });
 886                         }
 887                     }
 888                     self.visit_pat(&field.pat);
 889                 }
 890             }
 891             _ => visit::walk_pat(self, p),
 892         }
 893     }
 894
 895     fn process_var_decl(&mut self, pat: &'l ast::Pat) {
 896         // The pattern could declare multiple new vars,
 897         // we must walk the pattern and collect them all.
 898         let mut collector = PathCollector::new();
 899         collector.visit_pat(&pat);
 900         self.visit_pat(&pat);
 901
 902         // Process collected paths.
 903         for (id, ident, _) in collector.collected_idents {
 904             match self.save_ctxt.get_path_res(id) {
 905                 Res::Local(hir_id) => {
 906                     let id = self.tcx.hir().hir_to_node_id(hir_id);
 907                     let typ = self
 908                         .save_ctxt
 909                         .tables
 910                         .node_type_opt(hir_id)
 911                         .map(|t| t.to_string())
 912                         .unwrap_or_default();
 913
 914                     // Rust uses the id of the pattern for var lookups, so we'll use it too.
 915                     if !self.span.filter_generated(ident.span) {
 916                         let qualname = format!("{}${}", ident.to_string(), id);
 917                         let id = id_from_node_id(id, &self.save_ctxt);
 918                         let span = self.span_from_span(ident.span);
 919
 920                         self.dumper.dump_def(
 921                             &Access { public: false, reachable: false },
 922                             Def {
 923                                 kind: DefKind::Local,
 924                                 id,
 925                                 span,
 926                                 name: ident.to_string(),
 927                                 qualname,
 928                                 value: typ,
 929                                 parent: None,
 930                                 children: vec![],
 931                                 decl_id: None,
 932                                 docs: String::new(),
 933                                 sig: None,
 934                                 attributes: vec![],
 935                             },
 936                         );
 937                     }
 938                 }
 939                 Res::Def(HirDefKind::Ctor(..), _)
 940                 | Res::Def(HirDefKind::Const, _)
 941                 | Res::Def(HirDefKind::AssocConst, _)
 942                 | Res::Def(HirDefKind::Struct, _)
 943                 | Res::Def(HirDefKind::Variant, _)
 944                 | Res::Def(HirDefKind::TyAlias, _)
 945                 | Res::Def(HirDefKind::AssocTy, _)
 946                 | Res::SelfTy(..) => {
 947                     self.dump_path_ref(id, &ast::Path::from_ident(ident));
 948                 }
 949                 def => {
 950                     error!("unexpected definition kind when processing collected idents: {:?}", def)
 951                 }
 952             }
 953         }
 954
 955         for (id, ref path) in collector.collected_paths {
 956             self.process_path(id, path);
 957         }
 958     }
 959
 960     /// Extracts macro use and definition information from the AST node defined
 961     /// by the given NodeId, using the expansion information from the node's
 962     /// span.
 963     ///
 964     /// If the span is not macro-generated, do nothing, else use callee and
 965     /// callsite spans to record macro definition and use data, using the
 966     /// mac_uses and mac_defs sets to prevent multiples.
 967     fn process_macro_use(&mut self, _span: Span) {
 968         // FIXME if we're not dumping the defs (see below), there is no point
 969         // dumping refs either.
 970         // let source_span = span.source_callsite();
 971         // if !self.macro_calls.insert(source_span) {
 972         //     return;
 973         // }
 974
 975         // let data = match self.save_ctxt.get_macro_use_data(span) {
 976         //     None => return,
 977         //     Some(data) => data,
 978         // };
 979
 980         // self.dumper.macro_use(data);
 981
 982         // FIXME write the macro def
 983         // let mut hasher = DefaultHasher::new();
 984         // data.callee_span.hash(&mut hasher);
 985         // let hash = hasher.finish();
 986         // let qualname = format!("{}::{}", data.name, hash);
 987         // Don't write macro definition for imported macros
 988         // if !self.mac_defs.contains(&data.callee_span)
 989         //     && !data.imported {
 990         //     self.mac_defs.insert(data.callee_span);
 991         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
 992         //         self.dumper.macro_data(MacroData {
 993         //             span: sub_span,
 994         //             name: data.name.clone(),
 995         //             qualname: qualname.clone(),
 996         //             // FIXME where do macro docs come from?
 997         //             docs: String::new(),
 998         //         }.lower(self.tcx));
 999         //     }
1000         // }
1001     }
1002
1003     fn process_trait_item(&mut self, trait_item: &'l ast::AssocItem, trait_id: DefId) {
1004         self.process_macro_use(trait_item.span);
1005         let vis_span = trait_item.span.shrink_to_lo();
1006         match trait_item.kind {
1007             ast::AssocItemKind::Static(ref ty, _, ref expr)
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 generics, ref body) => {
1020                 self.process_method(
1021                     sig,
1022                     body.as_ref().map(|x| &**x),
1023                     trait_item.id,
1024                     trait_item.ident,
1025                     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::Static(ref ty, _, ref expr)
1079             | ast::AssocItemKind::Const(ref ty, ref expr) => {
1080                 self.process_assoc_const(
1081                     impl_item.id,
1082                     impl_item.ident,
1083                     &ty,
1084                     expr.as_deref(),
1085                     impl_id,
1086                     impl_item.vis.clone(),
1087                     &impl_item.attrs,
1088                 );
1089             }
1090             ast::AssocItemKind::Fn(ref sig, ref generics, ref body) => {
1091                 self.process_method(
1092                     sig,
1093                     body.as_deref(),
1094                     impl_item.id,
1095                     impl_item.ident,
1096                     generics,
1097                     impl_item.vis.clone(),
1098                     impl_item.span,
1099                 );
1100             }
1101             ast::AssocItemKind::TyAlias(_, _, None) => {}
1102             ast::AssocItemKind::TyAlias(_, _, Some(ref ty)) => {
1103                 // FIXME: uses of the assoc type should ideally point to this
1104                 // 'def' and the name here should be a ref to the def in the
1105                 // trait.
1106                 self.visit_ty(ty)
1107             }
1108             ast::AssocItemKind::Macro(_) => {}
1109         }
1110     }
1111
1112     /// Dumps imports in a use tree recursively.
1113     ///
1114     /// A use tree is an import that may contain nested braces (RFC 2128). The `use_tree` parameter
1115     /// is the current use tree under scrutiny, while `id` and `prefix` are its corresponding node
1116     /// ID and path. `root_item` is the topmost use tree in the hierarchy.
1117     ///
1118     /// If `use_tree` is a simple or glob import, it is dumped into the analysis data. Otherwise,
1119     /// each child use tree is dumped recursively.
1120     fn process_use_tree(
1121         &mut self,
1122         use_tree: &'l ast::UseTree,
1123         id: NodeId,
1124         root_item: &'l ast::Item,
1125         prefix: &ast::Path,
1126     ) {
1127         let path = &use_tree.prefix;
1128
1129         // The access is calculated using the current tree ID, but with the root tree's visibility
1130         // (since nested trees don't have their own visibility).
1131         let hir_id = self.tcx.hir().node_to_hir_id(id);
1132         let access = access_from!(self.save_ctxt, root_item, hir_id);
1133
1134         // The parent `DefId` of a given use tree is always the enclosing item.
1135         let parent = self
1136             .save_ctxt
1137             .tcx
1138             .hir()
1139             .opt_local_def_id_from_node_id(id)
1140             .and_then(|id| self.save_ctxt.tcx.parent(id))
1141             .map(id_from_def_id);
1142
1143         match use_tree.kind {
1144             ast::UseTreeKind::Simple(alias, ..) => {
1145                 let ident = use_tree.ident();
1146                 let path = ast::Path {
1147                     segments: prefix.segments.iter().chain(path.segments.iter()).cloned().collect(),
1148                     span: path.span,
1149                 };
1150
1151                 let sub_span = path.segments.last().unwrap().ident.span;
1152                 if !self.span.filter_generated(sub_span) {
1153                     let ref_id = self.lookup_def_id(id).map(|id| id_from_def_id(id));
1154                     let alias_span = alias.map(|i| self.span_from_span(i.span));
1155                     let span = self.span_from_span(sub_span);
1156                     self.dumper.import(
1157                         &access,
1158                         Import {
1159                             kind: ImportKind::Use,
1160                             ref_id,
1161                             span,
1162                             alias_span,
1163                             name: ident.to_string(),
1164                             value: String::new(),
1165                             parent,
1166                         },
1167                     );
1168                     self.write_sub_paths_truncated(&path);
1169                 }
1170             }
1171             ast::UseTreeKind::Glob => {
1172                 let path = ast::Path {
1173                     segments: prefix.segments.iter().chain(path.segments.iter()).cloned().collect(),
1174                     span: path.span,
1175                 };
1176
1177                 // Make a comma-separated list of names of imported modules.
1178                 let def_id = self.tcx.hir().local_def_id_from_node_id(id);
1179                 let names = self.tcx.names_imported_by_glob_use(def_id);
1180                 let names: Vec<_> = names.iter().map(|n| n.to_string()).collect();
1181
1182                 // Otherwise it's a span with wrong macro expansion info, which
1183                 // we don't want to track anyway, since it's probably macro-internal `use`
1184                 if let Some(sub_span) =
1185                     self.span.sub_span_of_token(use_tree.span, token::BinOp(token::Star))
1186                 {
1187                     if !self.span.filter_generated(use_tree.span) {
1188                         let span = self.span_from_span(sub_span);
1189
1190                         self.dumper.import(
1191                             &access,
1192                             Import {
1193                                 kind: ImportKind::GlobUse,
1194                                 ref_id: None,
1195                                 span,
1196                                 alias_span: None,
1197                                 name: "*".to_owned(),
1198                                 value: names.join(", "),
1199                                 parent,
1200                             },
1201                         );
1202                         self.write_sub_paths(&path);
1203                     }
1204                 }
1205             }
1206             ast::UseTreeKind::Nested(ref nested_items) => {
1207                 let prefix = ast::Path {
1208                     segments: prefix.segments.iter().chain(path.segments.iter()).cloned().collect(),
1209                     span: path.span,
1210                 };
1211                 for &(ref tree, id) in nested_items {
1212                     self.process_use_tree(tree, id, root_item, &prefix);
1213                 }
1214             }
1215         }
1216     }
1217
1218     fn process_bounds(&mut self, bounds: &'l ast::GenericBounds) {
1219         for bound in bounds {
1220             if let ast::GenericBound::Trait(ref trait_ref, _) = *bound {
1221                 self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1222             }
1223         }
1224     }
1225 }
1226
1227 impl<'l, 'tcx> Visitor<'l> for DumpVisitor<'l, 'tcx> {
1228     fn visit_mod(&mut self, m: &'l ast::Mod, span: Span, attrs: &[ast::Attribute], id: NodeId) {
1229         // Since we handle explicit modules ourselves in visit_item, this should
1230         // only get called for the root module of a crate.
1231         assert_eq!(id, ast::CRATE_NODE_ID);
1232
1233         let qualname =
1234             format!("::{}", self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(id)));
1235
1236         let cm = self.tcx.sess.source_map();
1237         let filename = cm.span_to_filename(span);
1238         let data_id = id_from_node_id(id, &self.save_ctxt);
1239         let children = m.items.iter().map(|i| id_from_node_id(i.id, &self.save_ctxt)).collect();
1240         let span = self.span_from_span(span);
1241
1242         self.dumper.dump_def(
1243             &Access { public: true, reachable: true },
1244             Def {
1245                 kind: DefKind::Mod,
1246                 id: data_id,
1247                 name: String::new(),
1248                 qualname,
1249                 span,
1250                 value: filename.to_string(),
1251                 children,
1252                 parent: None,
1253                 decl_id: None,
1254                 docs: self.save_ctxt.docs_for_attrs(attrs),
1255                 sig: None,
1256                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1257             },
1258         );
1259         visit::walk_mod(self, m);
1260     }
1261
1262     fn visit_item(&mut self, item: &'l ast::Item) {
1263         use syntax::ast::ItemKind::*;
1264         self.process_macro_use(item.span);
1265         match item.kind {
1266             Use(ref use_tree) => {
1267                 let prefix = ast::Path { segments: vec![], span: DUMMY_SP };
1268                 self.process_use_tree(use_tree, item.id, item, &prefix);
1269             }
1270             ExternCrate(_) => {
1271                 let name_span = item.ident.span;
1272                 if !self.span.filter_generated(name_span) {
1273                     let span = self.span_from_span(name_span);
1274                     let parent = self
1275                         .save_ctxt
1276                         .tcx
1277                         .hir()
1278                         .opt_local_def_id_from_node_id(item.id)
1279                         .and_then(|id| self.save_ctxt.tcx.parent(id))
1280                         .map(id_from_def_id);
1281                     self.dumper.import(
1282                         &Access { public: false, reachable: false },
1283                         Import {
1284                             kind: ImportKind::ExternCrate,
1285                             ref_id: None,
1286                             span,
1287                             alias_span: None,
1288                             name: item.ident.to_string(),
1289                             value: String::new(),
1290                             parent,
1291                         },
1292                     );
1293                 }
1294             }
1295             Fn(ref sig, ref ty_params, ref body) => {
1296                 self.process_fn(item, &sig.decl, &sig.header, ty_params, body.as_deref())
1297             }
1298             Static(ref typ, _, ref e) => self.process_static_or_const_item(item, typ, e.as_deref()),
1299             Const(ref typ, ref e) => self.process_static_or_const_item(item, typ, e.as_deref()),
1300             Struct(ref def, ref ty_params) | Union(ref def, ref ty_params) => {
1301                 self.process_struct(item, def, ty_params)
1302             }
1303             Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1304             Impl { ref generics, ref of_trait, ref self_ty, ref items, .. } => {
1305                 self.process_impl(item, generics, of_trait, &self_ty, items)
1306             }
1307             Trait(_, _, ref generics, ref trait_refs, ref methods) => {
1308                 self.process_trait(item, generics, trait_refs, methods)
1309             }
1310             Mod(ref m) => {
1311                 self.process_mod(item);
1312                 visit::walk_mod(self, m);
1313             }
1314             TyAlias(ref ty, ref ty_params) => {
1315                 let qualname = format!(
1316                     "::{}",
1317                     self.tcx.def_path_str(self.tcx.hir().local_def_id_from_node_id(item.id))
1318                 );
1319                 let value = ty_to_string(&ty);
1320                 if !self.span.filter_generated(item.ident.span) {
1321                     let span = self.span_from_span(item.ident.span);
1322                     let id = id_from_node_id(item.id, &self.save_ctxt);
1323                     let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1324
1325                     self.dumper.dump_def(
1326                         &access_from!(self.save_ctxt, item, hir_id),
1327                         Def {
1328                             kind: DefKind::Type,
1329                             id,
1330                             span,
1331                             name: item.ident.to_string(),
1332                             qualname: qualname.clone(),
1333                             value,
1334                             parent: None,
1335                             children: vec![],
1336                             decl_id: None,
1337                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1338                             sig: sig::item_signature(item, &self.save_ctxt),
1339                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1340                         },
1341                     );
1342                 }
1343
1344                 self.visit_ty(&ty);
1345                 self.process_generic_params(ty_params, &qualname, item.id);
1346             }
1347             Mac(_) => (),
1348             _ => visit::walk_item(self, item),
1349         }
1350     }
1351
1352     fn visit_generics(&mut self, generics: &'l ast::Generics) {
1353         for param in &generics.params {
1354             match param.kind {
1355                 ast::GenericParamKind::Lifetime { .. } => {}
1356                 ast::GenericParamKind::Type { ref default, .. } => {
1357                     self.process_bounds(&param.bounds);
1358                     if let Some(ref ty) = default {
1359                         self.visit_ty(&ty);
1360                     }
1361                 }
1362                 ast::GenericParamKind::Const { ref ty } => {
1363                     self.process_bounds(&param.bounds);
1364                     self.visit_ty(&ty);
1365                 }
1366             }
1367         }
1368         for pred in &generics.where_clause.predicates {
1369             if let ast::WherePredicate::BoundPredicate(ref wbp) = *pred {
1370                 self.process_bounds(&wbp.bounds);
1371                 self.visit_ty(&wbp.bounded_ty);
1372             }
1373         }
1374     }
1375
1376     fn visit_ty(&mut self, t: &'l ast::Ty) {
1377         self.process_macro_use(t.span);
1378         match t.kind {
1379             ast::TyKind::Path(_, ref path) => {
1380                 if generated_code(t.span) {
1381                     return;
1382                 }
1383
1384                 if let Some(id) = self.lookup_def_id(t.id) {
1385                     let sub_span = path.segments.last().unwrap().ident.span;
1386                     let span = self.span_from_span(sub_span);
1387                     self.dumper.dump_ref(Ref {
1388                         kind: RefKind::Type,
1389                         span,
1390                         ref_id: id_from_def_id(id),
1391                     });
1392                 }
1393
1394                 self.write_sub_paths_truncated(path);
1395                 visit::walk_path(self, path);
1396             }
1397             ast::TyKind::Array(ref element, ref length) => {
1398                 self.visit_ty(element);
1399                 self.nest_tables(length.id, |v| v.visit_expr(&length.value));
1400             }
1401             ast::TyKind::ImplTrait(id, ref bounds) => {
1402                 // FIXME: As of writing, the opaque type lowering introduces
1403                 // another DefPath scope/segment (used to declare the resulting
1404                 // opaque type item).
1405                 // However, the synthetic scope does *not* have associated
1406                 // typeck tables, which means we can't nest it and we fire an
1407                 // assertion when resolving the qualified type paths in trait
1408                 // bounds...
1409                 // This will panic if called on return type `impl Trait`, which
1410                 // we guard against in `process_fn`.
1411                 self.nest_tables(id, |v| v.process_bounds(bounds));
1412             }
1413             _ => visit::walk_ty(self, t),
1414         }
1415     }
1416
1417     fn visit_expr(&mut self, ex: &'l ast::Expr) {
1418         debug!("visit_expr {:?}", ex.kind);
1419         self.process_macro_use(ex.span);
1420         match ex.kind {
1421             ast::ExprKind::Struct(ref path, ref fields, ref base) => {
1422                 let expr_hir_id = self.save_ctxt.tcx.hir().node_to_hir_id(ex.id);
1423                 let hir_expr = self.save_ctxt.tcx.hir().expect_expr(expr_hir_id);
1424                 let adt = match self.save_ctxt.tables.expr_ty_opt(&hir_expr) {
1425                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1426                     _ => {
1427                         visit::walk_expr(self, ex);
1428                         return;
1429                     }
1430                 };
1431                 let node_id = self.save_ctxt.tcx.hir().hir_to_node_id(hir_expr.hir_id);
1432                 let res = self.save_ctxt.get_path_res(node_id);
1433                 self.process_struct_lit(ex, path, fields, adt.variant_of_res(res), base)
1434             }
1435             ast::ExprKind::MethodCall(ref seg, ref args) => self.process_method_call(ex, seg, args),
1436             ast::ExprKind::Field(ref sub_ex, _) => {
1437                 self.visit_expr(&sub_ex);
1438
1439                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1440                     down_cast_data!(field_data, RefData, ex.span);
1441                     if !generated_code(ex.span) {
1442                         self.dumper.dump_ref(field_data);
1443                     }
1444                 }
1445             }
1446             ast::ExprKind::Closure(_, _, _, ref decl, ref body, _fn_decl_span) => {
1447                 let id = format!("${}", ex.id);
1448
1449                 // walk arg and return types
1450                 for arg in &decl.inputs {
1451                     self.visit_ty(&arg.ty);
1452                 }
1453
1454                 if let ast::FnRetTy::Ty(ref ret_ty) = decl.output {
1455                     self.visit_ty(&ret_ty);
1456                 }
1457
1458                 // walk the body
1459                 self.nest_tables(ex.id, |v| {
1460                     v.process_formals(&decl.inputs, &id);
1461                     v.visit_expr(body)
1462                 });
1463             }
1464             ast::ExprKind::ForLoop(ref pattern, ref subexpression, ref block, _) => {
1465                 self.process_var_decl(pattern);
1466                 debug!("for loop, walk sub-expr: {:?}", subexpression.kind);
1467                 self.visit_expr(subexpression);
1468                 visit::walk_block(self, block);
1469             }
1470             ast::ExprKind::Let(ref pat, ref scrutinee) => {
1471                 self.process_var_decl(pat);
1472                 self.visit_expr(scrutinee);
1473             }
1474             ast::ExprKind::Repeat(ref element, ref count) => {
1475                 self.visit_expr(element);
1476                 self.nest_tables(count.id, |v| v.visit_expr(&count.value));
1477             }
1478             // In particular, we take this branch for call and path expressions,
1479             // where we'll index the idents involved just by continuing to walk.
1480             _ => visit::walk_expr(self, ex),
1481         }
1482     }
1483
1484     fn visit_pat(&mut self, p: &'l ast::Pat) {
1485         self.process_macro_use(p.span);
1486         self.process_pat(p);
1487     }
1488
1489     fn visit_arm(&mut self, arm: &'l ast::Arm) {
1490         self.process_var_decl(&arm.pat);
1491         if let Some(expr) = &arm.guard {
1492             self.visit_expr(expr);
1493         }
1494         self.visit_expr(&arm.body);
1495     }
1496
1497     fn visit_path(&mut self, p: &'l ast::Path, id: NodeId) {
1498         self.process_path(id, p);
1499     }
1500
1501     fn visit_stmt(&mut self, s: &'l ast::Stmt) {
1502         self.process_macro_use(s.span);
1503         visit::walk_stmt(self, s)
1504     }
1505
1506     fn visit_local(&mut self, l: &'l ast::Local) {
1507         self.process_macro_use(l.span);
1508         self.process_var_decl(&l.pat);
1509
1510         // Just walk the initialiser and type (don't want to walk the pattern again).
1511         walk_list!(self, visit_ty, &l.ty);
1512         walk_list!(self, visit_expr, &l.init);
1513     }
1514
1515     fn visit_foreign_item(&mut self, item: &'l ast::ForeignItem) {
1516         let hir_id = self.tcx.hir().node_to_hir_id(item.id);
1517         let access = access_from!(self.save_ctxt, item, hir_id);
1518
1519         match item.kind {
1520             ast::ForeignItemKind::Fn(ref sig, ref generics, _) => {
1521                 let decl = &sig.decl;
1522                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1523                     down_cast_data!(fn_data, DefData, item.span);
1524
1525                     self.process_generic_params(generics, &fn_data.qualname, item.id);
1526                     self.dumper.dump_def(&access, fn_data);
1527                 }
1528
1529                 for arg in &decl.inputs {
1530                     self.visit_ty(&arg.ty);
1531                 }
1532
1533                 if let ast::FnRetTy::Ty(ref ret_ty) = decl.output {
1534                     self.visit_ty(&ret_ty);
1535                 }
1536             }
1537             ast::ForeignItemKind::Const(ref ty, _) | ast::ForeignItemKind::Static(ref ty, _, _) => {
1538                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1539                     down_cast_data!(var_data, DefData, item.span);
1540                     self.dumper.dump_def(&access, var_data);
1541                 }
1542
1543                 self.visit_ty(ty);
1544             }
1545             ast::ForeignItemKind::TyAlias(..) => {
1546                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1547                     down_cast_data!(var_data, DefData, item.span);
1548                     self.dumper.dump_def(&access, var_data);
1549                 }
1550             }
1551             ast::ForeignItemKind::Macro(..) => {}
1552         }
1553     }
1554 }