src/librustc_save_analysis/dump_visitor.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! Write the output of rustc's analysis to an implementor of Dump.
  12 //!
  13 //! Dumping the analysis is implemented by walking the AST and getting a bunch of
  14 //! info out from all over the place. We use Def IDs to identify objects. The
  15 //! tricky part is getting syntactic (span, source text) and semantic (reference
  16 //! Def IDs) information for parts of expressions which the compiler has discarded.
  17 //! E.g., in a path `foo::bar::baz`, the compiler only keeps a span for the whole
  18 //! path and a reference to `baz`, but we want spans and references for all three
  19 //! idents.
  20 //!
  21 //! SpanUtils is used to manipulate spans. In particular, to extract sub-spans
  22 //! from spans (e.g., the span for `bar` from the above example path).
  23 //! DumpVisitor walks the AST and processes it, and JsonDumper is used for
  24 //! recording the output.
  25
  26 use rustc::hir::def::Def as HirDef;
  27 use rustc::hir::def_id::DefId;
  28 use rustc::session::config::Input;
  29 use rustc::ty::{self, TyCtxt};
  30 use rustc_data_structures::fx::FxHashSet;
  31
  32 use std::path::Path;
  33 use std::env;
  34
  35 use syntax::ast::{self, Attribute, NodeId, PatKind, CRATE_NODE_ID};
  36 use syntax::parse::token;
  37 use syntax::visit::{self, Visitor};
  38 use syntax::print::pprust::{
  39     bounds_to_string,
  40     generic_params_to_string,
  41     ty_to_string
  42 };
  43 use syntax::ptr::P;
  44 use syntax::source_map::{Spanned, DUMMY_SP, respan};
  45 use syntax_pos::*;
  46
  47 use {escape, generated_code, lower_attributes, PathCollector, SaveContext};
  48 use json_dumper::{Access, DumpOutput, JsonDumper};
  49 use span_utils::SpanUtils;
  50 use sig;
  51
  52 use rls_data::{CompilationOptions, CratePreludeData, Def, DefKind, GlobalCrateId, Import,
  53                ImportKind, Ref, RefKind, Relation, RelationKind, SpanData};
  54
  55 macro_rules! down_cast_data {
  56     ($id:ident, $kind:ident, $sp:expr) => {
  57         let $id = if let super::Data::$kind(data) = $id {
  58             data
  59         } else {
  60             span_bug!($sp, "unexpected data kind: {:?}", $id);
  61         };
  62     };
  63 }
  64
  65 macro_rules! access_from {
  66     ($save_ctxt:expr, $vis:expr, $id:expr) => {
  67         Access {
  68             public: $vis.node.is_pub(),
  69             reachable: $save_ctxt.analysis.access_levels.is_reachable($id),
  70         }
  71     };
  72
  73     ($save_ctxt:expr, $item:expr) => {
  74         Access {
  75             public: $item.vis.node.is_pub(),
  76             reachable: $save_ctxt.analysis.access_levels.is_reachable($item.id),
  77         }
  78     };
  79 }
  80
  81 pub struct DumpVisitor<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> {
  82     save_ctxt: SaveContext<'l, 'tcx>,
  83     tcx: TyCtxt<'l, 'tcx, 'tcx>,
  84     dumper: &'ll mut JsonDumper<O>,
  85
  86     span: SpanUtils<'l>,
  87
  88     cur_scope: NodeId,
  89
  90     // Set of macro definition (callee) spans, and the set
  91     // of macro use (callsite) spans. We store these to ensure
  92     // we only write one macro def per unique macro definition, and
  93     // one macro use per unique callsite span.
  94     // mac_defs: FxHashSet<Span>,
  95     // macro_calls: FxHashSet<Span>,
  96 }
  97
  98 impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
  99     pub fn new(
 100         save_ctxt: SaveContext<'l, 'tcx>,
 101         dumper: &'ll mut JsonDumper<O>,
 102     ) -> DumpVisitor<'l, 'tcx, 'll, O> {
 103         let span_utils = SpanUtils::new(&save_ctxt.tcx.sess);
 104         DumpVisitor {
 105             tcx: save_ctxt.tcx,
 106             save_ctxt,
 107             dumper,
 108             span: span_utils,
 109             cur_scope: CRATE_NODE_ID,
 110             // mac_defs: FxHashSet::default(),
 111             // macro_calls: FxHashSet::default(),
 112         }
 113     }
 114
 115     fn nest_scope<F>(&mut self, scope_id: NodeId, f: F)
 116     where
 117         F: FnOnce(&mut DumpVisitor<'l, 'tcx, 'll, O>),
 118     {
 119         let parent_scope = self.cur_scope;
 120         self.cur_scope = scope_id;
 121         f(self);
 122         self.cur_scope = parent_scope;
 123     }
 124
 125     fn nest_tables<F>(&mut self, item_id: NodeId, f: F)
 126     where
 127         F: FnOnce(&mut DumpVisitor<'l, 'tcx, 'll, O>),
 128     {
 129         let item_def_id = self.tcx.hir.local_def_id(item_id);
 130         if self.tcx.has_typeck_tables(item_def_id) {
 131             let tables = self.tcx.typeck_tables_of(item_def_id);
 132             let old_tables = self.save_ctxt.tables;
 133             self.save_ctxt.tables = tables;
 134             f(self);
 135             self.save_ctxt.tables = old_tables;
 136         } else {
 137             f(self);
 138         }
 139     }
 140
 141     fn span_from_span(&self, span: Span) -> SpanData {
 142         self.save_ctxt.span_from_span(span)
 143     }
 144
 145     pub fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
 146         let source_file = self.tcx.sess.local_crate_source_file.as_ref();
 147         let crate_root = source_file.map(|source_file| {
 148             let source_file = Path::new(source_file);
 149             match source_file.file_name() {
 150                 Some(_) => source_file.parent().unwrap().display(),
 151                 None => source_file.display(),
 152             }.to_string()
 153         });
 154
 155         let data = CratePreludeData {
 156             crate_id: GlobalCrateId {
 157                 name: name.into(),
 158                 disambiguator: self.tcx
 159                     .sess
 160                     .local_crate_disambiguator()
 161                     .to_fingerprint()
 162                     .as_value(),
 163             },
 164             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
 165             external_crates: self.save_ctxt.get_external_crates(),
 166             span: self.span_from_span(krate.span),
 167         };
 168
 169         self.dumper.crate_prelude(data);
 170     }
 171
 172     pub fn dump_compilation_options(&mut self, input: &Input, crate_name: &str) {
 173         // Apply possible `remap-path-prefix` remapping to the input source file
 174         // (and don't include remapping args anymore)
 175         let (program, arguments) = {
 176             let remap_arg_indices = {
 177                 let mut indices = FxHashSet::default();
 178                 // Args are guaranteed to be valid UTF-8 (checked early)
 179                 for (i, e) in env::args().enumerate() {
 180                     if e.starts_with("--remap-path-prefix=") {
 181                         indices.insert(i);
 182                     } else if e == "--remap-path-prefix" {
 183                         indices.insert(i);
 184                         indices.insert(i + 1);
 185                     }
 186                 }
 187                 indices
 188             };
 189
 190             let mut args = env::args()
 191                 .enumerate()
 192                 .filter(|(i, _)| !remap_arg_indices.contains(i))
 193                 .map(|(_, arg)| {
 194                     match input {
 195                         Input::File(ref path) if path == Path::new(&arg) => {
 196                             let mapped = &self.tcx.sess.local_crate_source_file;
 197                             mapped
 198                                 .as_ref()
 199                                 .unwrap()
 200                                 .to_string_lossy()
 201                                 .into()
 202                         },
 203                         _ => arg,
 204                     }
 205                 });
 206
 207             (args.next().unwrap(), args.collect())
 208         };
 209
 210         let data = CompilationOptions {
 211             directory: self.tcx.sess.working_dir.0.clone(),
 212             program,
 213             arguments,
 214             output: self.save_ctxt.compilation_output(crate_name),
 215         };
 216
 217         self.dumper.compilation_opts(data);
 218     }
 219
 220     fn write_sub_paths(&mut self, path: &ast::Path) {
 221         for seg in &path.segments {
 222             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 223                 self.dumper.dump_ref(data);
 224             }
 225         }
 226     }
 227
 228     // As write_sub_paths, but does not process the last ident in the path (assuming it
 229     // will be processed elsewhere). See note on write_sub_paths about global.
 230     fn write_sub_paths_truncated(&mut self, path: &ast::Path) {
 231         for seg in &path.segments[..path.segments.len() - 1] {
 232             if let Some(data) = self.save_ctxt.get_path_segment_data(seg) {
 233                 self.dumper.dump_ref(data);
 234             }
 235         }
 236     }
 237
 238     fn lookup_def_id(&self, ref_id: NodeId) -> Option<DefId> {
 239         match self.save_ctxt.get_path_def(ref_id) {
 240             HirDef::PrimTy(..) | HirDef::SelfTy(..) | HirDef::Err => None,
 241             def => Some(def.def_id()),
 242         }
 243     }
 244
 245     fn process_formals(&mut self, formals: &'l [ast::Arg], qualname: &str) {
 246         for arg in formals {
 247             self.visit_pat(&arg.pat);
 248             let mut collector = PathCollector::new();
 249             collector.visit_pat(&arg.pat);
 250
 251             for (id, ident, ..) in collector.collected_idents {
 252                 let hir_id = self.tcx.hir.node_to_hir_id(id);
 253                 let typ = match self.save_ctxt.tables.node_id_to_type_opt(hir_id) {
 254                     Some(s) => s.to_string(),
 255                     None => continue,
 256                 };
 257                 if !self.span.filter_generated(ident.span) {
 258                     let id = ::id_from_node_id(id, &self.save_ctxt);
 259                     let span = self.span_from_span(ident.span);
 260
 261                     self.dumper.dump_def(
 262                         &Access {
 263                             public: false,
 264                             reachable: false,
 265                         },
 266                         Def {
 267                             kind: DefKind::Local,
 268                             id,
 269                             span,
 270                             name: ident.to_string(),
 271                             qualname: format!("{}::{}", qualname, ident.to_string()),
 272                             value: typ,
 273                             parent: None,
 274                             children: vec![],
 275                             decl_id: None,
 276                             docs: String::new(),
 277                             sig: None,
 278                             attributes: vec![],
 279                         },
 280                     );
 281                 }
 282             }
 283         }
 284     }
 285
 286     fn process_method(
 287         &mut self,
 288         sig: &'l ast::MethodSig,
 289         body: Option<&'l ast::Block>,
 290         id: ast::NodeId,
 291         ident: ast::Ident,
 292         generics: &'l ast::Generics,
 293         vis: ast::Visibility,
 294         span: Span,
 295     ) {
 296         debug!("process_method: {}:{}", id, ident);
 297
 298         if let Some(mut method_data) = self.save_ctxt.get_method_data(id, ident, span) {
 299             let sig_str = ::make_signature(&sig.decl, &generics);
 300             if body.is_some() {
 301                 self.nest_tables(
 302                     id,
 303                     |v| v.process_formals(&sig.decl.inputs, &method_data.qualname),
 304                 );
 305             }
 306
 307             self.process_generic_params(&generics, &method_data.qualname, id);
 308
 309             method_data.value = sig_str;
 310             method_data.sig = sig::method_signature(id, ident, generics, sig, &self.save_ctxt);
 311             self.dumper.dump_def(&access_from!(self.save_ctxt, vis, id), method_data);
 312         }
 313
 314         // walk arg and return types
 315         for arg in &sig.decl.inputs {
 316             self.visit_ty(&arg.ty);
 317         }
 318
 319         if let ast::FunctionRetTy::Ty(ref ret_ty) = sig.decl.output {
 320             self.visit_ty(ret_ty);
 321         }
 322
 323         // walk the fn body
 324         if let Some(body) = body {
 325             self.nest_tables(id, |v| v.nest_scope(id, |v| v.visit_block(body)));
 326         }
 327     }
 328
 329     fn process_struct_field_def(&mut self, field: &ast::StructField, parent_id: NodeId) {
 330         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 331         if let Some(field_data) = field_data {
 332             self.dumper.dump_def(&access_from!(self.save_ctxt, field), field_data);
 333         }
 334     }
 335
 336     // Dump generic params bindings, then visit_generics
 337     fn process_generic_params(
 338         &mut self,
 339         generics: &'l ast::Generics,
 340         prefix: &str,
 341         id: NodeId,
 342     ) {
 343         for param in &generics.params {
 344             match param.kind {
 345                 ast::GenericParamKind::Lifetime { .. } => {}
 346                 ast::GenericParamKind::Type { .. } => {
 347                     let param_ss = param.ident.span;
 348                     let name = escape(self.span.snippet(param_ss));
 349                     // Append $id to name to make sure each one is unique.
 350                     let qualname = format!("{}::{}${}", prefix, name, id);
 351                     if !self.span.filter_generated(param_ss) {
 352                         let id = ::id_from_node_id(param.id, &self.save_ctxt);
 353                         let span = self.span_from_span(param_ss);
 354
 355                         self.dumper.dump_def(
 356                             &Access {
 357                                 public: false,
 358                                 reachable: false,
 359                             },
 360                             Def {
 361                                 kind: DefKind::Type,
 362                                 id,
 363                                 span,
 364                                 name,
 365                                 qualname,
 366                                 value: String::new(),
 367                                 parent: None,
 368                                 children: vec![],
 369                                 decl_id: None,
 370                                 docs: String::new(),
 371                                 sig: None,
 372                                 attributes: vec![],
 373                             },
 374                         );
 375                     }
 376                 }
 377             }
 378         }
 379         self.visit_generics(generics);
 380     }
 381
 382     fn process_fn(
 383         &mut self,
 384         item: &'l ast::Item,
 385         decl: &'l ast::FnDecl,
 386         ty_params: &'l ast::Generics,
 387         body: &'l ast::Block,
 388     ) {
 389         if let Some(fn_data) = self.save_ctxt.get_item_data(item) {
 390             down_cast_data!(fn_data, DefData, item.span);
 391             self.nest_tables(
 392                 item.id,
 393                 |v| v.process_formals(&decl.inputs, &fn_data.qualname),
 394             );
 395             self.process_generic_params(ty_params, &fn_data.qualname, item.id);
 396             self.dumper.dump_def(&access_from!(self.save_ctxt, item), fn_data);
 397         }
 398
 399         for arg in &decl.inputs {
 400             self.visit_ty(&arg.ty);
 401         }
 402
 403         if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
 404             self.visit_ty(&ret_ty);
 405         }
 406
 407         self.nest_tables(item.id, |v| v.nest_scope(item.id, |v| v.visit_block(&body)));
 408     }
 409
 410     fn process_static_or_const_item(
 411         &mut self,
 412         item: &'l ast::Item,
 413         typ: &'l ast::Ty,
 414         expr: &'l ast::Expr,
 415     ) {
 416         self.nest_tables(item.id, |v| {
 417             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 418                 down_cast_data!(var_data, DefData, item.span);
 419                 v.dumper.dump_def(&access_from!(v.save_ctxt, item), var_data);
 420             }
 421             v.visit_ty(&typ);
 422             v.visit_expr(expr);
 423         });
 424     }
 425
 426     fn process_assoc_const(
 427         &mut self,
 428         id: ast::NodeId,
 429         ident: ast::Ident,
 430         typ: &'l ast::Ty,
 431         expr: Option<&'l ast::Expr>,
 432         parent_id: DefId,
 433         vis: ast::Visibility,
 434         attrs: &'l [Attribute],
 435     ) {
 436         let qualname = format!("::{}", self.tcx.node_path_str(id));
 437
 438         if !self.span.filter_generated(ident.span) {
 439             let sig = sig::assoc_const_signature(id, ident.name, typ, expr, &self.save_ctxt);
 440             let span = self.span_from_span(ident.span);
 441
 442             self.dumper.dump_def(
 443                 &access_from!(self.save_ctxt, vis, id),
 444                 Def {
 445                     kind: DefKind::Const,
 446                     id: ::id_from_node_id(id, &self.save_ctxt),
 447                     span,
 448                     name: ident.name.to_string(),
 449                     qualname,
 450                     value: ty_to_string(&typ),
 451                     parent: Some(::id_from_def_id(parent_id)),
 452                     children: vec![],
 453                     decl_id: None,
 454                     docs: self.save_ctxt.docs_for_attrs(attrs),
 455                     sig,
 456                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 457                 },
 458             );
 459         }
 460
 461         // walk type and init value
 462         self.visit_ty(typ);
 463         if let Some(expr) = expr {
 464             self.visit_expr(expr);
 465         }
 466     }
 467
 468     // FIXME tuple structs should generate tuple-specific data.
 469     fn process_struct(
 470         &mut self,
 471         item: &'l ast::Item,
 472         def: &'l ast::VariantData,
 473         ty_params: &'l ast::Generics,
 474     ) {
 475         debug!("process_struct {:?} {:?}", item, item.span);
 476         let name = item.ident.to_string();
 477         let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 478
 479         let kind = match item.node {
 480             ast::ItemKind::Struct(_, _) => DefKind::Struct,
 481             ast::ItemKind::Union(_, _) => DefKind::Union,
 482             _ => unreachable!(),
 483         };
 484
 485         let (value, fields) = match item.node {
 486             ast::ItemKind::Struct(ast::VariantData::Struct(ref fields, _), _) |
 487             ast::ItemKind::Union(ast::VariantData::Struct(ref fields, _), _) => {
 488                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 489                 let fields_str = fields
 490                     .iter()
 491                     .enumerate()
 492                     .filter_map(|(i, f)| {
 493                         if include_priv_fields || f.vis.node.is_pub() {
 494                             f.ident
 495                                 .map(|i| i.to_string())
 496                                 .or_else(|| Some(i.to_string()))
 497                         } else {
 498                             None
 499                         }
 500                     })
 501                     .collect::<Vec<_>>()
 502                     .join(", ");
 503                 let value = format!("{} {{ {} }}", name, fields_str);
 504                 (
 505                     value,
 506                     fields
 507                         .iter()
 508                         .map(|f| ::id_from_node_id(f.id, &self.save_ctxt))
 509                         .collect(),
 510                 )
 511             }
 512             _ => (String::new(), vec![]),
 513         };
 514
 515         if !self.span.filter_generated(item.ident.span) {
 516             let span = self.span_from_span(item.ident.span);
 517             self.dumper.dump_def(
 518                 &access_from!(self.save_ctxt, item),
 519                 Def {
 520                     kind,
 521                     id: ::id_from_node_id(item.id, &self.save_ctxt),
 522                     span,
 523                     name,
 524                     qualname: qualname.clone(),
 525                     value,
 526                     parent: None,
 527                     children: fields,
 528                     decl_id: None,
 529                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 530                     sig: sig::item_signature(item, &self.save_ctxt),
 531                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 532                 },
 533             );
 534         }
 535
 536         for field in def.fields() {
 537             self.process_struct_field_def(field, item.id);
 538             self.visit_ty(&field.ty);
 539         }
 540
 541         self.process_generic_params(ty_params, &qualname, item.id);
 542     }
 543
 544     fn process_enum(
 545         &mut self,
 546         item: &'l ast::Item,
 547         enum_definition: &'l ast::EnumDef,
 548         ty_params: &'l ast::Generics,
 549     ) {
 550         let enum_data = self.save_ctxt.get_item_data(item);
 551         let enum_data = match enum_data {
 552             None => return,
 553             Some(data) => data,
 554         };
 555         down_cast_data!(enum_data, DefData, item.span);
 556
 557         let access = access_from!(self.save_ctxt, item);
 558
 559         for variant in &enum_definition.variants {
 560             let name = variant.node.ident.name.to_string();
 561             let qualname = format!("{}::{}", enum_data.qualname, name);
 562             let name_span = variant.node.ident.span;
 563
 564             match variant.node.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.node.data.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.node.attrs),
 593                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 594                                 attributes: lower_attributes(
 595                                     variant.node.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.node.data.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.node.attrs),
 631                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 632                                 attributes: lower_attributes(
 633                                     variant.node.attrs.clone(),
 634                                     &self.save_ctxt,
 635                                 ),
 636                             },
 637                         );
 638                     }
 639                 }
 640             }
 641
 642
 643             for field in variant.node.data.fields() {
 644                 self.process_struct_field_def(field, variant.node.data.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         type_parameters: &'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 let super::Data::RelationData(rel, imp) = impl_data {
 662                 self.dumper.dump_relation(rel);
 663                 self.dumper.dump_impl(imp);
 664             } else {
 665                 span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 666             }
 667         }
 668         self.visit_ty(&typ);
 669         if let &Some(ref trait_ref) = trait_ref {
 670             self.process_path(trait_ref.ref_id, &trait_ref.path);
 671         }
 672         self.process_generic_params(type_parameters, "", item.id);
 673         for impl_item in impl_items {
 674             let map = &self.tcx.hir;
 675             self.process_impl_item(impl_item, map.local_def_id(item.id));
 676         }
 677     }
 678
 679     fn process_trait(
 680         &mut self,
 681         item: &'l ast::Item,
 682         generics: &'l ast::Generics,
 683         trait_refs: &'l ast::GenericBounds,
 684         methods: &'l [ast::TraitItem],
 685     ) {
 686         let name = item.ident.to_string();
 687         let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 688         let mut val = name.clone();
 689         if !generics.params.is_empty() {
 690             val.push_str(&generic_params_to_string(&generics.params));
 691         }
 692         if !trait_refs.is_empty() {
 693             val.push_str(": ");
 694             val.push_str(&bounds_to_string(trait_refs));
 695         }
 696         if !self.span.filter_generated(item.ident.span) {
 697             let id = ::id_from_node_id(item.id, &self.save_ctxt);
 698             let span = self.span_from_span(item.ident.span);
 699             let children = methods
 700                 .iter()
 701                 .map(|i| ::id_from_node_id(i.id, &self.save_ctxt))
 702                 .collect();
 703             self.dumper.dump_def(
 704                 &access_from!(self.save_ctxt, item),
 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(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             self.dumper.dump_def(&access_from!(self.save_ctxt, item), mod_data);
 763         }
 764     }
 765
 766     fn dump_path_ref(&mut self, id: NodeId, path: &ast::Path) {
 767         let path_data = self.save_ctxt.get_path_data(id, path);
 768         if let Some(path_data) = path_data {
 769             self.dumper.dump_ref(path_data);
 770         }
 771     }
 772
 773     fn process_path(&mut self, id: NodeId, path: &'l ast::Path) {
 774         if self.span.filter_generated(path.span) {
 775             return;
 776         }
 777         self.dump_path_ref(id, path);
 778
 779         // Type arguments
 780         for seg in &path.segments {
 781             if let Some(ref generic_args) = seg.args {
 782                 match **generic_args {
 783                     ast::GenericArgs::AngleBracketed(ref data) => {
 784                         for arg in &data.args {
 785                             match arg {
 786                                 ast::GenericArg::Type(ty) => self.visit_ty(ty),
 787                                 _ => {}
 788                             }
 789                         }
 790                     }
 791                     ast::GenericArgs::Parenthesized(ref data) => {
 792                         for t in &data.inputs {
 793                             self.visit_ty(t);
 794                         }
 795                         if let Some(ref t) = data.output {
 796                             self.visit_ty(t);
 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.node {
 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_id_to_type_opt(hir_id) {
 869                     Some(ty) => ty.ty_adt_def().unwrap(),
 870                     None => {
 871                         visit::walk_pat(self, p);
 872                         return;
 873                     }
 874                 };
 875                 let variant = adt.variant_of_def(self.save_ctxt.get_path_def(p.id));
 876
 877                 for &Spanned { node: ref 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_multi(&mut self, pats: &'l [P<ast::Pat>]) {
 896         let mut collector = PathCollector::new();
 897         for pattern in pats {
 898             // collect paths from the arm's patterns
 899             collector.visit_pat(&pattern);
 900             self.visit_pat(&pattern);
 901         }
 902
 903         // process collected paths
 904         for (id, ident, immut) in collector.collected_idents {
 905             match self.save_ctxt.get_path_def(id) {
 906                 HirDef::Local(id) => {
 907                     let mut value = if immut == ast::Mutability::Immutable {
 908                         self.span.snippet(ident.span)
 909                     } else {
 910                         "<mutable>".to_owned()
 911                     };
 912                     let hir_id = self.tcx.hir.node_to_hir_id(id);
 913                     let typ = self.save_ctxt
 914                         .tables
 915                         .node_id_to_type_opt(hir_id)
 916                         .map(|t| t.to_string())
 917                         .unwrap_or_default();
 918                     value.push_str(": ");
 919                     value.push_str(&typ);
 920
 921                     if !self.span.filter_generated(ident.span) {
 922                         let qualname = format!("{}${}", ident.to_string(), id);
 923                         let id = ::id_from_node_id(id, &self.save_ctxt);
 924                         let span = self.span_from_span(ident.span);
 925
 926                         self.dumper.dump_def(
 927                             &Access {
 928                                 public: false,
 929                                 reachable: false,
 930                             },
 931                             Def {
 932                                 kind: DefKind::Local,
 933                                 id,
 934                                 span,
 935                                 name: ident.to_string(),
 936                                 qualname,
 937                                 value: typ,
 938                                 parent: None,
 939                                 children: vec![],
 940                                 decl_id: None,
 941                                 docs: String::new(),
 942                                 sig: None,
 943                                 attributes: vec![],
 944                             },
 945                         );
 946                     }
 947                 }
 948                 HirDef::StructCtor(..) |
 949                 HirDef::VariantCtor(..) |
 950                 HirDef::Const(..) |
 951                 HirDef::AssociatedConst(..) |
 952                 HirDef::Struct(..) |
 953                 HirDef::Variant(..) |
 954                 HirDef::TyAlias(..) |
 955                 HirDef::AssociatedTy(..) |
 956                 HirDef::SelfTy(..) => {
 957                     self.dump_path_ref(id, &ast::Path::from_ident(ident));
 958                 }
 959                 def => error!(
 960                     "unexpected definition kind when processing collected idents: {:?}",
 961                     def
 962                 ),
 963             }
 964         }
 965
 966         for (id, ref path) in collector.collected_paths {
 967             self.process_path(id, path);
 968         }
 969     }
 970
 971     fn process_var_decl(&mut self, p: &'l ast::Pat, value: String) {
 972         // The local could declare multiple new vars, we must walk the
 973         // pattern and collect them all.
 974         let mut collector = PathCollector::new();
 975         collector.visit_pat(&p);
 976         self.visit_pat(&p);
 977
 978         for (id, ident, immut) in collector.collected_idents {
 979             let mut value = match immut {
 980                 ast::Mutability::Immutable => value.to_string(),
 981                 _ => String::new(),
 982             };
 983             let hir_id = self.tcx.hir.node_to_hir_id(id);
 984             let typ = match self.save_ctxt.tables.node_id_to_type_opt(hir_id) {
 985                 Some(typ) => {
 986                     let typ = typ.to_string();
 987                     if !value.is_empty() {
 988                         value.push_str(": ");
 989                     }
 990                     value.push_str(&typ);
 991                     typ
 992                 }
 993                 None => String::new(),
 994             };
 995
 996             // Rust uses the id of the pattern for var lookups, so we'll use it too.
 997             if !self.span.filter_generated(ident.span) {
 998                 let qualname = format!("{}${}", ident.to_string(), id);
 999                 let id = ::id_from_node_id(id, &self.save_ctxt);
1000                 let span = self.span_from_span(ident.span);
1001
1002                 self.dumper.dump_def(
1003                     &Access {
1004                         public: false,
1005                         reachable: false,
1006                     },
1007                     Def {
1008                         kind: DefKind::Local,
1009                         id,
1010                         span,
1011                         name: ident.to_string(),
1012                         qualname,
1013                         value: typ,
1014                         parent: None,
1015                         children: vec![],
1016                         decl_id: None,
1017                         docs: String::new(),
1018                         sig: None,
1019                         attributes: vec![],
1020                     },
1021                 );
1022             }
1023         }
1024     }
1025
1026     /// Extract macro use and definition information from the AST node defined
1027     /// by the given NodeId, using the expansion information from the node's
1028     /// span.
1029     ///
1030     /// If the span is not macro-generated, do nothing, else use callee and
1031     /// callsite spans to record macro definition and use data, using the
1032     /// mac_uses and mac_defs sets to prevent multiples.
1033     fn process_macro_use(&mut self, _span: Span) {
1034         // FIXME if we're not dumping the defs (see below), there is no point
1035         // dumping refs either.
1036         // let source_span = span.source_callsite();
1037         // if !self.macro_calls.insert(source_span) {
1038         //     return;
1039         // }
1040
1041         // let data = match self.save_ctxt.get_macro_use_data(span) {
1042         //     None => return,
1043         //     Some(data) => data,
1044         // };
1045
1046         // self.dumper.macro_use(data);
1047
1048         // FIXME write the macro def
1049         // let mut hasher = DefaultHasher::new();
1050         // data.callee_span.hash(&mut hasher);
1051         // let hash = hasher.finish();
1052         // let qualname = format!("{}::{}", data.name, hash);
1053         // Don't write macro definition for imported macros
1054         // if !self.mac_defs.contains(&data.callee_span)
1055         //     && !data.imported {
1056         //     self.mac_defs.insert(data.callee_span);
1057         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
1058         //         self.dumper.macro_data(MacroData {
1059         //             span: sub_span,
1060         //             name: data.name.clone(),
1061         //             qualname: qualname.clone(),
1062         //             // FIXME where do macro docs come from?
1063         //             docs: String::new(),
1064         //         }.lower(self.tcx));
1065         //     }
1066         // }
1067     }
1068
1069     fn process_trait_item(&mut self, trait_item: &'l ast::TraitItem, trait_id: DefId) {
1070         self.process_macro_use(trait_item.span);
1071         let vis_span = trait_item.span.shrink_to_lo();
1072         match trait_item.node {
1073             ast::TraitItemKind::Const(ref ty, ref expr) => {
1074                 self.process_assoc_const(
1075                     trait_item.id,
1076                     trait_item.ident,
1077                     &ty,
1078                     expr.as_ref().map(|e| &**e),
1079                     trait_id,
1080                     respan(vis_span, ast::VisibilityKind::Public),
1081                     &trait_item.attrs,
1082                 );
1083             }
1084             ast::TraitItemKind::Method(ref sig, ref body) => {
1085                 self.process_method(
1086                     sig,
1087                     body.as_ref().map(|x| &**x),
1088                     trait_item.id,
1089                     trait_item.ident,
1090                     &trait_item.generics,
1091                     respan(vis_span, ast::VisibilityKind::Public),
1092                     trait_item.span,
1093                 );
1094             }
1095             ast::TraitItemKind::Type(ref bounds, ref default_ty) => {
1096                 // FIXME do something with _bounds (for type refs)
1097                 let name = trait_item.ident.name.to_string();
1098                 let qualname = format!("::{}", self.tcx.node_path_str(trait_item.id));
1099
1100                 if !self.span.filter_generated(trait_item.ident.span) {
1101                     let span = self.span_from_span(trait_item.ident.span);
1102                     let id = ::id_from_node_id(trait_item.id, &self.save_ctxt);
1103
1104                     self.dumper.dump_def(
1105                         &Access {
1106                             public: true,
1107                             reachable: true,
1108                         },
1109                         Def {
1110                             kind: DefKind::Type,
1111                             id,
1112                             span,
1113                             name,
1114                             qualname,
1115                             value: self.span.snippet(trait_item.span),
1116                             parent: Some(::id_from_def_id(trait_id)),
1117                             children: vec![],
1118                             decl_id: None,
1119                             docs: self.save_ctxt.docs_for_attrs(&trait_item.attrs),
1120                             sig: sig::assoc_type_signature(
1121                                 trait_item.id,
1122                                 trait_item.ident,
1123                                 Some(bounds),
1124                                 default_ty.as_ref().map(|ty| &**ty),
1125                                 &self.save_ctxt,
1126                             ),
1127                             attributes: lower_attributes(trait_item.attrs.clone(), &self.save_ctxt),
1128                         },
1129                     );
1130                 }
1131
1132                 if let &Some(ref default_ty) = default_ty {
1133                     self.visit_ty(default_ty)
1134                 }
1135             }
1136             ast::TraitItemKind::Macro(_) => {}
1137         }
1138     }
1139
1140     fn process_impl_item(&mut self, impl_item: &'l ast::ImplItem, impl_id: DefId) {
1141         self.process_macro_use(impl_item.span);
1142         match impl_item.node {
1143             ast::ImplItemKind::Const(ref ty, ref expr) => {
1144                 self.process_assoc_const(
1145                     impl_item.id,
1146                     impl_item.ident,
1147                     &ty,
1148                     Some(expr),
1149                     impl_id,
1150                     impl_item.vis.clone(),
1151                     &impl_item.attrs,
1152                 );
1153             }
1154             ast::ImplItemKind::Method(ref sig, ref body) => {
1155                 self.process_method(
1156                     sig,
1157                     Some(body),
1158                     impl_item.id,
1159                     impl_item.ident,
1160                     &impl_item.generics,
1161                     impl_item.vis.clone(),
1162                     impl_item.span,
1163                 );
1164             }
1165             ast::ImplItemKind::Type(ref ty) => {
1166                 // FIXME uses of the assoc type should ideally point to this
1167                 // 'def' and the name here should be a ref to the def in the
1168                 // trait.
1169                 self.visit_ty(ty)
1170             }
1171             ast::ImplItemKind::Existential(ref bounds) => {
1172                 // FIXME uses of the assoc type should ideally point to this
1173                 // 'def' and the name here should be a ref to the def in the
1174                 // trait.
1175                 for bound in bounds.iter() {
1176                     if let ast::GenericBound::Trait(trait_ref, _) = bound {
1177                         self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1178                     }
1179                 }
1180             }
1181             ast::ImplItemKind::Macro(_) => {}
1182         }
1183     }
1184
1185     /// Dumps imports in a use tree recursively.
1186     ///
1187     /// A use tree is an import that may contain nested braces (RFC 2128). The `use_tree` parameter
1188     /// is the current use tree under scrutiny, while `id` and `prefix` are its corresponding node
1189     /// id and path. `root_item` is the topmost use tree in the hierarchy.
1190     ///
1191     /// If `use_tree` is a simple or glob import, it is dumped into the analysis data. Otherwise,
1192     /// each child use tree is dumped recursively.
1193     fn process_use_tree(&mut self,
1194                          use_tree: &'l ast::UseTree,
1195                          id: NodeId,
1196                          root_item: &'l ast::Item,
1197                          prefix: &ast::Path) {
1198         let path = &use_tree.prefix;
1199
1200         // The access is calculated using the current tree ID, but with the root tree's visibility
1201         // (since nested trees don't have their own visibility).
1202         let access = access_from!(self.save_ctxt, root_item.vis, id);
1203
1204         // The parent def id of a given use tree is always the enclosing item.
1205         let parent = self.save_ctxt.tcx.hir.opt_local_def_id(id)
1206             .and_then(|id| self.save_ctxt.tcx.parent_def_id(id))
1207             .map(::id_from_def_id);
1208
1209         match use_tree.kind {
1210             ast::UseTreeKind::Simple(alias, ..) => {
1211                 let ident = use_tree.ident();
1212                 let path = ast::Path {
1213                     segments: prefix.segments
1214                         .iter()
1215                         .chain(path.segments.iter())
1216                         .cloned()
1217                         .collect(),
1218                     span: path.span,
1219                 };
1220
1221                 let sub_span = path.segments.last().unwrap().ident.span;
1222                 if !self.span.filter_generated(sub_span) {
1223                     let ref_id = self.lookup_def_id(id).map(|id| ::id_from_def_id(id));
1224                     let alias_span = alias.map(|i| self.span_from_span(i.span));
1225                     let span = self.span_from_span(sub_span);
1226                     self.dumper.import(&access, Import {
1227                         kind: ImportKind::Use,
1228                         ref_id,
1229                         span,
1230                         alias_span,
1231                         name: ident.to_string(),
1232                         value: String::new(),
1233                         parent,
1234                     });
1235                     self.write_sub_paths_truncated(&path);
1236                 }
1237             }
1238             ast::UseTreeKind::Glob => {
1239                 let path = ast::Path {
1240                     segments: prefix.segments
1241                         .iter()
1242                         .chain(path.segments.iter())
1243                         .cloned()
1244                         .collect(),
1245                     span: path.span,
1246                 };
1247
1248                 // Make a comma-separated list of names of imported modules.
1249                 let glob_map = &self.save_ctxt.analysis.glob_map;
1250                 let glob_map = glob_map.as_ref().unwrap();
1251                 let names = if glob_map.contains_key(&id) {
1252                     glob_map.get(&id).unwrap().iter().map(|n| n.to_string()).collect()
1253                 } else {
1254                     Vec::new()
1255                 };
1256
1257                 let sub_span =
1258                     self.span.sub_span_of_token(use_tree.span, token::BinOp(token::Star));
1259                 if !self.span.filter_generated(use_tree.span) {
1260                     let span =
1261                         self.span_from_span(sub_span.expect("No span found for use glob"));
1262                     self.dumper.import(&access, Import {
1263                         kind: ImportKind::GlobUse,
1264                         ref_id: None,
1265                         span,
1266                         alias_span: None,
1267                         name: "*".to_owned(),
1268                         value: names.join(", "),
1269                         parent,
1270                     });
1271                     self.write_sub_paths(&path);
1272                 }
1273             }
1274             ast::UseTreeKind::Nested(ref nested_items) => {
1275                 let prefix = ast::Path {
1276                     segments: prefix.segments
1277                         .iter()
1278                         .chain(path.segments.iter())
1279                         .cloned()
1280                         .collect(),
1281                     span: path.span,
1282                 };
1283                 for &(ref tree, id) in nested_items {
1284                     self.process_use_tree(tree, id, root_item, &prefix);
1285                 }
1286             }
1287         }
1288     }
1289
1290     fn process_bounds(&mut self, bounds: &'l ast::GenericBounds) {
1291         for bound in bounds {
1292             if let ast::GenericBound::Trait(ref trait_ref, _) = *bound {
1293                 self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1294             }
1295         }
1296     }
1297 }
1298
1299 impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> Visitor<'l> for DumpVisitor<'l, 'tcx, 'll, O> {
1300     fn visit_mod(&mut self, m: &'l ast::Mod, span: Span, attrs: &[ast::Attribute], id: NodeId) {
1301         // Since we handle explicit modules ourselves in visit_item, this should
1302         // only get called for the root module of a crate.
1303         assert_eq!(id, ast::CRATE_NODE_ID);
1304
1305         let qualname = format!("::{}", self.tcx.node_path_str(id));
1306
1307         let cm = self.tcx.sess.source_map();
1308         let filename = cm.span_to_filename(span);
1309         let data_id = ::id_from_node_id(id, &self.save_ctxt);
1310         let children = m.items
1311             .iter()
1312             .map(|i| ::id_from_node_id(i.id, &self.save_ctxt))
1313             .collect();
1314         let span = self.span_from_span(span);
1315
1316         self.dumper.dump_def(
1317             &Access {
1318                 public: true,
1319                 reachable: true,
1320             },
1321             Def {
1322                 kind: DefKind::Mod,
1323                 id: data_id,
1324                 name: String::new(),
1325                 qualname,
1326                 span,
1327                 value: filename.to_string(),
1328                 children,
1329                 parent: None,
1330                 decl_id: None,
1331                 docs: self.save_ctxt.docs_for_attrs(attrs),
1332                 sig: None,
1333                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1334             },
1335         );
1336         self.nest_scope(id, |v| visit::walk_mod(v, m));
1337     }
1338
1339     fn visit_item(&mut self, item: &'l ast::Item) {
1340         use syntax::ast::ItemKind::*;
1341         self.process_macro_use(item.span);
1342         match item.node {
1343             Use(ref use_tree) => {
1344                 let prefix = ast::Path {
1345                     segments: vec![],
1346                     span: DUMMY_SP,
1347                 };
1348                 self.process_use_tree(use_tree, item.id, item, &prefix);
1349             }
1350             ExternCrate(_) => {
1351                 let name_span = item.ident.span;
1352                 if !self.span.filter_generated(name_span) {
1353                     let span = self.span_from_span(name_span);
1354                     let parent = self.save_ctxt.tcx.hir.opt_local_def_id(item.id)
1355                         .and_then(|id| self.save_ctxt.tcx.parent_def_id(id))
1356                         .map(::id_from_def_id);
1357                     self.dumper.import(
1358                         &Access {
1359                             public: false,
1360                             reachable: false,
1361                         },
1362                         Import {
1363                             kind: ImportKind::ExternCrate,
1364                             ref_id: None,
1365                             span,
1366                             alias_span: None,
1367                             name: item.ident.to_string(),
1368                             value: String::new(),
1369                             parent,
1370                         },
1371                     );
1372                 }
1373             }
1374             Fn(ref decl, .., ref ty_params, ref body) => {
1375                 self.process_fn(item, &decl, ty_params, &body)
1376             }
1377             Static(ref typ, _, ref expr) => self.process_static_or_const_item(item, typ, expr),
1378             Const(ref typ, ref expr) => self.process_static_or_const_item(item, &typ, &expr),
1379             Struct(ref def, ref ty_params) | Union(ref def, ref ty_params) => {
1380                 self.process_struct(item, def, ty_params)
1381             }
1382             Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1383             Impl(.., ref ty_params, ref trait_ref, ref typ, ref impl_items) => {
1384                 self.process_impl(item, ty_params, trait_ref, &typ, impl_items)
1385             }
1386             Trait(_, _, ref generics, ref trait_refs, ref methods) => {
1387                 self.process_trait(item, generics, trait_refs, methods)
1388             }
1389             Mod(ref m) => {
1390                 self.process_mod(item);
1391                 self.nest_scope(item.id, |v| visit::walk_mod(v, m));
1392             }
1393             Ty(ref ty, ref ty_params) => {
1394                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
1395                 let value = ty_to_string(&ty);
1396                 if !self.span.filter_generated(item.ident.span) {
1397                     let span = self.span_from_span(item.ident.span);
1398                     let id = ::id_from_node_id(item.id, &self.save_ctxt);
1399
1400                     self.dumper.dump_def(
1401                         &access_from!(self.save_ctxt, item),
1402                         Def {
1403                             kind: DefKind::Type,
1404                             id,
1405                             span,
1406                             name: item.ident.to_string(),
1407                             qualname: qualname.clone(),
1408                             value,
1409                             parent: None,
1410                             children: vec![],
1411                             decl_id: None,
1412                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1413                             sig: sig::item_signature(item, &self.save_ctxt),
1414                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1415                         },
1416                     );
1417                 }
1418
1419                 self.visit_ty(&ty);
1420                 self.process_generic_params(ty_params, &qualname, item.id);
1421             }
1422             Existential(ref _bounds, ref ty_params) => {
1423                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
1424                 // FIXME do something with _bounds
1425                 let value = String::new();
1426                 if !self.span.filter_generated(item.ident.span) {
1427                     let span = self.span_from_span(item.ident.span);
1428                     let id = ::id_from_node_id(item.id, &self.save_ctxt);
1429
1430                     self.dumper.dump_def(
1431                         &access_from!(self.save_ctxt, item),
1432                         Def {
1433                             kind: DefKind::Type,
1434                             id,
1435                             span,
1436                             name: item.ident.to_string(),
1437                             qualname: qualname.clone(),
1438                             value,
1439                             parent: None,
1440                             children: vec![],
1441                             decl_id: None,
1442                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1443                             sig: sig::item_signature(item, &self.save_ctxt),
1444                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1445                         },
1446                     );
1447                 }
1448
1449                 self.process_generic_params(ty_params, &qualname, item.id);
1450             }
1451             Mac(_) => (),
1452             _ => visit::walk_item(self, item),
1453         }
1454     }
1455
1456     fn visit_generics(&mut self, generics: &'l ast::Generics) {
1457         for param in &generics.params {
1458             if let ast::GenericParamKind::Type { ref default, .. } = param.kind {
1459                 self.process_bounds(&param.bounds);
1460                 if let Some(ref ty) = default {
1461                     self.visit_ty(&ty);
1462                 }
1463             }
1464         }
1465         for pred in &generics.where_clause.predicates {
1466             if let ast::WherePredicate::BoundPredicate(ref wbp) = *pred {
1467                 self.process_bounds(&wbp.bounds);
1468                 self.visit_ty(&wbp.bounded_ty);
1469             }
1470         }
1471     }
1472
1473     fn visit_ty(&mut self, t: &'l ast::Ty) {
1474         self.process_macro_use(t.span);
1475         match t.node {
1476             ast::TyKind::Path(_, ref path) => {
1477                 if generated_code(t.span) {
1478                     return;
1479                 }
1480
1481                 if let Some(id) = self.lookup_def_id(t.id) {
1482                     let sub_span = path.segments.last().unwrap().ident.span;
1483                     let span = self.span_from_span(sub_span);
1484                     self.dumper.dump_ref(Ref {
1485                         kind: RefKind::Type,
1486                         span,
1487                         ref_id: ::id_from_def_id(id),
1488                     });
1489                 }
1490
1491                 self.write_sub_paths_truncated(path);
1492                 visit::walk_path(self, path);
1493             }
1494             ast::TyKind::Array(ref element, ref length) => {
1495                 self.visit_ty(element);
1496                 self.nest_tables(length.id, |v| v.visit_expr(&length.value));
1497             }
1498             _ => visit::walk_ty(self, t),
1499         }
1500     }
1501
1502     fn visit_expr(&mut self, ex: &'l ast::Expr) {
1503         debug!("visit_expr {:?}", ex.node);
1504         self.process_macro_use(ex.span);
1505         match ex.node {
1506             ast::ExprKind::Struct(ref path, ref fields, ref base) => {
1507                 let hir_expr = self.save_ctxt.tcx.hir.expect_expr(ex.id);
1508                 let adt = match self.save_ctxt.tables.expr_ty_opt(&hir_expr) {
1509                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1510                     _ => {
1511                         visit::walk_expr(self, ex);
1512                         return;
1513                     }
1514                 };
1515                 let def = self.save_ctxt.get_path_def(hir_expr.id);
1516                 self.process_struct_lit(ex, path, fields, adt.variant_of_def(def), base)
1517             }
1518             ast::ExprKind::MethodCall(ref seg, ref args) => self.process_method_call(ex, seg, args),
1519             ast::ExprKind::Field(ref sub_ex, _) => {
1520                 self.visit_expr(&sub_ex);
1521
1522                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1523                     down_cast_data!(field_data, RefData, ex.span);
1524                     if !generated_code(ex.span) {
1525                         self.dumper.dump_ref(field_data);
1526                     }
1527                 }
1528             }
1529             ast::ExprKind::Closure(_, _, _, ref decl, ref body, _fn_decl_span) => {
1530                 let id = format!("${}", ex.id);
1531
1532                 // walk arg and return types
1533                 for arg in &decl.inputs {
1534                     self.visit_ty(&arg.ty);
1535                 }
1536
1537                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1538                     self.visit_ty(&ret_ty);
1539                 }
1540
1541                 // walk the body
1542                 self.nest_tables(ex.id, |v| {
1543                     v.process_formals(&decl.inputs, &id);
1544                     v.nest_scope(ex.id, |v| v.visit_expr(body))
1545                 });
1546             }
1547             ast::ExprKind::ForLoop(ref pattern, ref subexpression, ref block, _) => {
1548                 let value = self.span.snippet(subexpression.span);
1549                 self.process_var_decl(pattern, value);
1550                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1551                 self.visit_expr(subexpression);
1552                 visit::walk_block(self, block);
1553             }
1554             ast::ExprKind::WhileLet(ref pats, ref subexpression, ref block, _) => {
1555                 self.process_var_decl_multi(pats);
1556                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1557                 self.visit_expr(subexpression);
1558                 visit::walk_block(self, block);
1559             }
1560             ast::ExprKind::IfLet(ref pats, ref subexpression, ref block, ref opt_else) => {
1561                 self.process_var_decl_multi(pats);
1562                 self.visit_expr(subexpression);
1563                 visit::walk_block(self, block);
1564                 opt_else.as_ref().map(|el| self.visit_expr(el));
1565             }
1566             ast::ExprKind::Repeat(ref element, ref count) => {
1567                 self.visit_expr(element);
1568                 self.nest_tables(count.id, |v| v.visit_expr(&count.value));
1569             }
1570             // In particular, we take this branch for call and path expressions,
1571             // where we'll index the idents involved just by continuing to walk.
1572             _ => visit::walk_expr(self, ex),
1573         }
1574     }
1575
1576     fn visit_mac(&mut self, mac: &'l ast::Mac) {
1577         // These shouldn't exist in the AST at this point, log a span bug.
1578         span_bug!(
1579             mac.span,
1580             "macro invocation should have been expanded out of AST"
1581         );
1582     }
1583
1584     fn visit_pat(&mut self, p: &'l ast::Pat) {
1585         self.process_macro_use(p.span);
1586         self.process_pat(p);
1587     }
1588
1589     fn visit_arm(&mut self, arm: &'l ast::Arm) {
1590         self.process_var_decl_multi(&arm.pats);
1591         match arm.guard {
1592             Some(ast::Guard::If(ref expr)) => self.visit_expr(expr),
1593             _ => {}
1594         }
1595         self.visit_expr(&arm.body);
1596     }
1597
1598     fn visit_path(&mut self, p: &'l ast::Path, id: NodeId) {
1599         self.process_path(id, p);
1600     }
1601
1602     fn visit_stmt(&mut self, s: &'l ast::Stmt) {
1603         self.process_macro_use(s.span);
1604         visit::walk_stmt(self, s)
1605     }
1606
1607     fn visit_local(&mut self, l: &'l ast::Local) {
1608         self.process_macro_use(l.span);
1609         let value = l.init
1610             .as_ref()
1611             .map(|i| self.span.snippet(i.span))
1612             .unwrap_or_default();
1613         self.process_var_decl(&l.pat, value);
1614
1615         // Just walk the initialiser and type (don't want to walk the pattern again).
1616         walk_list!(self, visit_ty, &l.ty);
1617         walk_list!(self, visit_expr, &l.init);
1618     }
1619
1620     fn visit_foreign_item(&mut self, item: &'l ast::ForeignItem) {
1621         let access = access_from!(self.save_ctxt, item);
1622
1623         match item.node {
1624             ast::ForeignItemKind::Fn(ref decl, ref generics) => {
1625                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1626                     down_cast_data!(fn_data, DefData, item.span);
1627
1628                     self.process_generic_params(generics, &fn_data.qualname, item.id);
1629                     self.dumper.dump_def(&access, fn_data);
1630                 }
1631
1632                 for arg in &decl.inputs {
1633                     self.visit_ty(&arg.ty);
1634                 }
1635
1636                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1637                     self.visit_ty(&ret_ty);
1638                 }
1639             }
1640             ast::ForeignItemKind::Static(ref ty, _) => {
1641                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1642                     down_cast_data!(var_data, DefData, item.span);
1643                     self.dumper.dump_def(&access, var_data);
1644                 }
1645
1646                 self.visit_ty(ty);
1647             }
1648             ast::ForeignItemKind::Ty => {
1649                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1650                     down_cast_data!(var_data, DefData, item.span);
1651                     self.dumper.dump_def(&access, var_data);
1652                 }
1653             }
1654             ast::ForeignItemKind::Macro(..) => {}
1655         }
1656     }
1657 }