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         debug!("process_path {:?}", path);
 775         if generated_code(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                             match arg {
 787                                 ast::GenericArg::Type(ty) => self.visit_ty(ty),
 788                                 _ => {}
 789                             }
 790                         }
 791                     }
 792                     ast::GenericArgs::Parenthesized(ref data) => {
 793                         for t in &data.inputs {
 794                             self.visit_ty(t);
 795                         }
 796                         if let Some(ref t) = data.output {
 797                             self.visit_ty(t);
 798                         }
 799                     }
 800                 }
 801             }
 802         }
 803
 804         self.write_sub_paths_truncated(path);
 805     }
 806
 807     fn process_struct_lit(
 808         &mut self,
 809         ex: &'l ast::Expr,
 810         path: &'l ast::Path,
 811         fields: &'l [ast::Field],
 812         variant: &'l ty::VariantDef,
 813         base: &'l Option<P<ast::Expr>>,
 814     ) {
 815         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 816             self.write_sub_paths_truncated(path);
 817             down_cast_data!(struct_lit_data, RefData, ex.span);
 818             if !generated_code(ex.span) {
 819                 self.dumper.dump_ref(struct_lit_data);
 820             }
 821
 822             for field in fields {
 823                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 824                     self.dumper.dump_ref(field_data);
 825                 }
 826
 827                 self.visit_expr(&field.expr)
 828             }
 829         }
 830
 831         walk_list!(self, visit_expr, base);
 832     }
 833
 834     fn process_method_call(
 835         &mut self,
 836         ex: &'l ast::Expr,
 837         seg: &'l ast::PathSegment,
 838         args: &'l [P<ast::Expr>],
 839     ) {
 840         debug!("process_method_call {:?} {:?}", ex, ex.span);
 841         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 842             down_cast_data!(mcd, RefData, ex.span);
 843             if !generated_code(ex.span) {
 844                 self.dumper.dump_ref(mcd);
 845             }
 846         }
 847
 848         // Explicit types in the turbo-fish.
 849         if let Some(ref generic_args) = seg.args {
 850             if let ast::GenericArgs::AngleBracketed(ref data) = **generic_args {
 851                 for arg in &data.args {
 852                     match arg {
 853                         ast::GenericArg::Type(ty) => self.visit_ty(ty),
 854                         _ => {}
 855                     }
 856                 }
 857             }
 858         }
 859
 860         // walk receiver and args
 861         walk_list!(self, visit_expr, args);
 862     }
 863
 864     fn process_pat(&mut self, p: &'l ast::Pat) {
 865         match p.node {
 866             PatKind::Struct(ref _path, ref fields, _) => {
 867                 // FIXME do something with _path?
 868                 let hir_id = self.tcx.hir.node_to_hir_id(p.id);
 869                 let adt = match self.save_ctxt.tables.node_id_to_type_opt(hir_id) {
 870                     Some(ty) => ty.ty_adt_def().unwrap(),
 871                     None => {
 872                         visit::walk_pat(self, p);
 873                         return;
 874                     }
 875                 };
 876                 let variant = adt.variant_of_def(self.save_ctxt.get_path_def(p.id));
 877
 878                 for &Spanned { node: ref field, .. } in fields {
 879                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 880                         if !self.span.filter_generated(field.ident.span) {
 881                             let span = self.span_from_span(field.ident.span);
 882                             self.dumper.dump_ref(Ref {
 883                                 kind: RefKind::Variable,
 884                                 span,
 885                                 ref_id: ::id_from_def_id(variant.fields[index].did),
 886                             });
 887                         }
 888                     }
 889                     self.visit_pat(&field.pat);
 890                 }
 891             }
 892             _ => visit::walk_pat(self, p),
 893         }
 894     }
 895
 896     fn process_var_decl_multi(&mut self, pats: &'l [P<ast::Pat>]) {
 897         let mut collector = PathCollector::new();
 898         for pattern in pats {
 899             // collect paths from the arm's patterns
 900             collector.visit_pat(&pattern);
 901             self.visit_pat(&pattern);
 902         }
 903
 904         // process collected paths
 905         for (id, ident, immut) in collector.collected_idents {
 906             match self.save_ctxt.get_path_def(id) {
 907                 HirDef::Local(id) => {
 908                     let mut value = if immut == ast::Mutability::Immutable {
 909                         self.span.snippet(ident.span)
 910                     } else {
 911                         "<mutable>".to_owned()
 912                     };
 913                     let hir_id = self.tcx.hir.node_to_hir_id(id);
 914                     let typ = self.save_ctxt
 915                         .tables
 916                         .node_id_to_type_opt(hir_id)
 917                         .map(|t| t.to_string())
 918                         .unwrap_or_default();
 919                     value.push_str(": ");
 920                     value.push_str(&typ);
 921
 922                     if !self.span.filter_generated(ident.span) {
 923                         let qualname = format!("{}${}", ident.to_string(), id);
 924                         let id = ::id_from_node_id(id, &self.save_ctxt);
 925                         let span = self.span_from_span(ident.span);
 926
 927                         self.dumper.dump_def(
 928                             &Access {
 929                                 public: false,
 930                                 reachable: false,
 931                             },
 932                             Def {
 933                                 kind: DefKind::Local,
 934                                 id,
 935                                 span,
 936                                 name: ident.to_string(),
 937                                 qualname,
 938                                 value: typ,
 939                                 parent: None,
 940                                 children: vec![],
 941                                 decl_id: None,
 942                                 docs: String::new(),
 943                                 sig: None,
 944                                 attributes: vec![],
 945                             },
 946                         );
 947                     }
 948                 }
 949                 HirDef::StructCtor(..) |
 950                 HirDef::VariantCtor(..) |
 951                 HirDef::Const(..) |
 952                 HirDef::AssociatedConst(..) |
 953                 HirDef::Struct(..) |
 954                 HirDef::Variant(..) |
 955                 HirDef::TyAlias(..) |
 956                 HirDef::AssociatedTy(..) |
 957                 HirDef::SelfTy(..) => {
 958                     self.dump_path_ref(id, &ast::Path::from_ident(ident));
 959                 }
 960                 def => error!(
 961                     "unexpected definition kind when processing collected idents: {:?}",
 962                     def
 963                 ),
 964             }
 965         }
 966
 967         for (id, ref path) in collector.collected_paths {
 968             self.process_path(id, path);
 969         }
 970     }
 971
 972     fn process_var_decl(&mut self, p: &'l ast::Pat, value: String) {
 973         // The local could declare multiple new vars, we must walk the
 974         // pattern and collect them all.
 975         let mut collector = PathCollector::new();
 976         collector.visit_pat(&p);
 977         self.visit_pat(&p);
 978
 979         for (id, ident, immut) in collector.collected_idents {
 980             let mut value = match immut {
 981                 ast::Mutability::Immutable => value.to_string(),
 982                 _ => String::new(),
 983             };
 984             let hir_id = self.tcx.hir.node_to_hir_id(id);
 985             let typ = match self.save_ctxt.tables.node_id_to_type_opt(hir_id) {
 986                 Some(typ) => {
 987                     let typ = typ.to_string();
 988                     if !value.is_empty() {
 989                         value.push_str(": ");
 990                     }
 991                     value.push_str(&typ);
 992                     typ
 993                 }
 994                 None => String::new(),
 995             };
 996
 997             // Rust uses the id of the pattern for var lookups, so we'll use it too.
 998             if !self.span.filter_generated(ident.span) {
 999                 let qualname = format!("{}${}", ident.to_string(), id);
1000                 let id = ::id_from_node_id(id, &self.save_ctxt);
1001                 let span = self.span_from_span(ident.span);
1002
1003                 self.dumper.dump_def(
1004                     &Access {
1005                         public: false,
1006                         reachable: false,
1007                     },
1008                     Def {
1009                         kind: DefKind::Local,
1010                         id,
1011                         span,
1012                         name: ident.to_string(),
1013                         qualname,
1014                         value: typ,
1015                         parent: None,
1016                         children: vec![],
1017                         decl_id: None,
1018                         docs: String::new(),
1019                         sig: None,
1020                         attributes: vec![],
1021                     },
1022                 );
1023             }
1024         }
1025     }
1026
1027     /// Extract macro use and definition information from the AST node defined
1028     /// by the given NodeId, using the expansion information from the node's
1029     /// span.
1030     ///
1031     /// If the span is not macro-generated, do nothing, else use callee and
1032     /// callsite spans to record macro definition and use data, using the
1033     /// mac_uses and mac_defs sets to prevent multiples.
1034     fn process_macro_use(&mut self, span: Span) {
1035         let source_span = span.source_callsite();
1036         if !self.macro_calls.insert(source_span) {
1037             return;
1038         }
1039
1040         let data = match self.save_ctxt.get_macro_use_data(span) {
1041             None => return,
1042             Some(data) => data,
1043         };
1044
1045         self.dumper.macro_use(data);
1046
1047         // FIXME write the macro def
1048         // let mut hasher = DefaultHasher::new();
1049         // data.callee_span.hash(&mut hasher);
1050         // let hash = hasher.finish();
1051         // let qualname = format!("{}::{}", data.name, hash);
1052         // Don't write macro definition for imported macros
1053         // if !self.mac_defs.contains(&data.callee_span)
1054         //     && !data.imported {
1055         //     self.mac_defs.insert(data.callee_span);
1056         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
1057         //         self.dumper.macro_data(MacroData {
1058         //             span: sub_span,
1059         //             name: data.name.clone(),
1060         //             qualname: qualname.clone(),
1061         //             // FIXME where do macro docs come from?
1062         //             docs: String::new(),
1063         //         }.lower(self.tcx));
1064         //     }
1065         // }
1066     }
1067
1068     fn process_trait_item(&mut self, trait_item: &'l ast::TraitItem, trait_id: DefId) {
1069         self.process_macro_use(trait_item.span);
1070         let vis_span = trait_item.span.shrink_to_lo();
1071         match trait_item.node {
1072             ast::TraitItemKind::Const(ref ty, ref expr) => {
1073                 self.process_assoc_const(
1074                     trait_item.id,
1075                     trait_item.ident,
1076                     &ty,
1077                     expr.as_ref().map(|e| &**e),
1078                     trait_id,
1079                     respan(vis_span, ast::VisibilityKind::Public),
1080                     &trait_item.attrs,
1081                 );
1082             }
1083             ast::TraitItemKind::Method(ref sig, ref body) => {
1084                 self.process_method(
1085                     sig,
1086                     body.as_ref().map(|x| &**x),
1087                     trait_item.id,
1088                     trait_item.ident,
1089                     &trait_item.generics,
1090                     respan(vis_span, ast::VisibilityKind::Public),
1091                     trait_item.span,
1092                 );
1093             }
1094             ast::TraitItemKind::Type(ref bounds, ref default_ty) => {
1095                 // FIXME do something with _bounds (for type refs)
1096                 let name = trait_item.ident.name.to_string();
1097                 let qualname = format!("::{}", self.tcx.node_path_str(trait_item.id));
1098
1099                 if !self.span.filter_generated(trait_item.ident.span) {
1100                     let span = self.span_from_span(trait_item.ident.span);
1101                     let id = ::id_from_node_id(trait_item.id, &self.save_ctxt);
1102
1103                     self.dumper.dump_def(
1104                         &Access {
1105                             public: true,
1106                             reachable: true,
1107                         },
1108                         Def {
1109                             kind: DefKind::Type,
1110                             id,
1111                             span,
1112                             name,
1113                             qualname,
1114                             value: self.span.snippet(trait_item.span),
1115                             parent: Some(::id_from_def_id(trait_id)),
1116                             children: vec![],
1117                             decl_id: None,
1118                             docs: self.save_ctxt.docs_for_attrs(&trait_item.attrs),
1119                             sig: sig::assoc_type_signature(
1120                                 trait_item.id,
1121                                 trait_item.ident,
1122                                 Some(bounds),
1123                                 default_ty.as_ref().map(|ty| &**ty),
1124                                 &self.save_ctxt,
1125                             ),
1126                             attributes: lower_attributes(trait_item.attrs.clone(), &self.save_ctxt),
1127                         },
1128                     );
1129                 }
1130
1131                 if let &Some(ref default_ty) = default_ty {
1132                     self.visit_ty(default_ty)
1133                 }
1134             }
1135             ast::TraitItemKind::Macro(_) => {}
1136         }
1137     }
1138
1139     fn process_impl_item(&mut self, impl_item: &'l ast::ImplItem, impl_id: DefId) {
1140         self.process_macro_use(impl_item.span);
1141         match impl_item.node {
1142             ast::ImplItemKind::Const(ref ty, ref expr) => {
1143                 self.process_assoc_const(
1144                     impl_item.id,
1145                     impl_item.ident,
1146                     &ty,
1147                     Some(expr),
1148                     impl_id,
1149                     impl_item.vis.clone(),
1150                     &impl_item.attrs,
1151                 );
1152             }
1153             ast::ImplItemKind::Method(ref sig, ref body) => {
1154                 self.process_method(
1155                     sig,
1156                     Some(body),
1157                     impl_item.id,
1158                     impl_item.ident,
1159                     &impl_item.generics,
1160                     impl_item.vis.clone(),
1161                     impl_item.span,
1162                 );
1163             }
1164             ast::ImplItemKind::Type(ref ty) => {
1165                 // FIXME uses of the assoc type should ideally point to this
1166                 // 'def' and the name here should be a ref to the def in the
1167                 // trait.
1168                 self.visit_ty(ty)
1169             }
1170             ast::ImplItemKind::Existential(ref bounds) => {
1171                 // FIXME uses of the assoc type should ideally point to this
1172                 // 'def' and the name here should be a ref to the def in the
1173                 // trait.
1174                 for bound in bounds.iter() {
1175                     if let ast::GenericBound::Trait(trait_ref, _) = bound {
1176                         self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1177                     }
1178                 }
1179             }
1180             ast::ImplItemKind::Macro(_) => {}
1181         }
1182     }
1183
1184     /// Dumps imports in a use tree recursively.
1185     ///
1186     /// A use tree is an import that may contain nested braces (RFC 2128). The `use_tree` parameter
1187     /// is the current use tree under scrutiny, while `id` and `prefix` are its corresponding node
1188     /// id and path. `root_item` is the topmost use tree in the hierarchy.
1189     ///
1190     /// If `use_tree` is a simple or glob import, it is dumped into the analysis data. Otherwise,
1191     /// each child use tree is dumped recursively.
1192     fn process_use_tree(&mut self,
1193                          use_tree: &'l ast::UseTree,
1194                          id: NodeId,
1195                          root_item: &'l ast::Item,
1196                          prefix: &ast::Path) {
1197         let path = &use_tree.prefix;
1198
1199         // The access is calculated using the current tree ID, but with the root tree's visibility
1200         // (since nested trees don't have their own visibility).
1201         let access = access_from!(self.save_ctxt, root_item.vis, id);
1202
1203         // The parent def id of a given use tree is always the enclosing item.
1204         let parent = self.save_ctxt.tcx.hir.opt_local_def_id(id)
1205             .and_then(|id| self.save_ctxt.tcx.parent_def_id(id))
1206             .map(::id_from_def_id);
1207
1208         match use_tree.kind {
1209             ast::UseTreeKind::Simple(alias, ..) => {
1210                 let ident = use_tree.ident();
1211                 let path = ast::Path {
1212                     segments: prefix.segments
1213                         .iter()
1214                         .chain(path.segments.iter())
1215                         .cloned()
1216                         .collect(),
1217                     span: path.span,
1218                 };
1219
1220                 let sub_span = path.segments.last().unwrap().ident.span;
1221                 if !self.span.filter_generated(sub_span) {
1222                     let ref_id = self.lookup_def_id(id).map(|id| ::id_from_def_id(id));
1223                     let alias_span = alias.map(|i| self.span_from_span(i.span));
1224                     let span = self.span_from_span(sub_span);
1225                     self.dumper.import(&access, Import {
1226                         kind: ImportKind::Use,
1227                         ref_id,
1228                         span,
1229                         alias_span,
1230                         name: ident.to_string(),
1231                         value: String::new(),
1232                         parent,
1233                     });
1234                     self.write_sub_paths_truncated(&path);
1235                 }
1236             }
1237             ast::UseTreeKind::Glob => {
1238                 let path = ast::Path {
1239                     segments: prefix.segments
1240                         .iter()
1241                         .chain(path.segments.iter())
1242                         .cloned()
1243                         .collect(),
1244                     span: path.span,
1245                 };
1246
1247                 // Make a comma-separated list of names of imported modules.
1248                 let glob_map = &self.save_ctxt.analysis.glob_map;
1249                 let glob_map = glob_map.as_ref().unwrap();
1250                 let names = if glob_map.contains_key(&id) {
1251                     glob_map.get(&id).unwrap().iter().map(|n| n.to_string()).collect()
1252                 } else {
1253                     Vec::new()
1254                 };
1255
1256                 let sub_span =
1257                     self.span.sub_span_of_token(use_tree.span, token::BinOp(token::Star));
1258                 if !self.span.filter_generated(use_tree.span) {
1259                     let span =
1260                         self.span_from_span(sub_span.expect("No span found for use glob"));
1261                     self.dumper.import(&access, Import {
1262                         kind: ImportKind::GlobUse,
1263                         ref_id: None,
1264                         span,
1265                         alias_span: None,
1266                         name: "*".to_owned(),
1267                         value: names.join(", "),
1268                         parent,
1269                     });
1270                     self.write_sub_paths(&path);
1271                 }
1272             }
1273             ast::UseTreeKind::Nested(ref nested_items) => {
1274                 let prefix = ast::Path {
1275                     segments: prefix.segments
1276                         .iter()
1277                         .chain(path.segments.iter())
1278                         .cloned()
1279                         .collect(),
1280                     span: path.span,
1281                 };
1282                 for &(ref tree, id) in nested_items {
1283                     self.process_use_tree(tree, id, root_item, &prefix);
1284                 }
1285             }
1286         }
1287     }
1288
1289     fn process_bounds(&mut self, bounds: &'l ast::GenericBounds) {
1290         for bound in bounds {
1291             if let ast::GenericBound::Trait(ref trait_ref, _) = *bound {
1292                 self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1293             }
1294         }
1295     }
1296 }
1297
1298 impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> Visitor<'l> for DumpVisitor<'l, 'tcx, 'll, O> {
1299     fn visit_mod(&mut self, m: &'l ast::Mod, span: Span, attrs: &[ast::Attribute], id: NodeId) {
1300         // Since we handle explicit modules ourselves in visit_item, this should
1301         // only get called for the root module of a crate.
1302         assert_eq!(id, ast::CRATE_NODE_ID);
1303
1304         let qualname = format!("::{}", self.tcx.node_path_str(id));
1305
1306         let cm = self.tcx.sess.source_map();
1307         let filename = cm.span_to_filename(span);
1308         let data_id = ::id_from_node_id(id, &self.save_ctxt);
1309         let children = m.items
1310             .iter()
1311             .map(|i| ::id_from_node_id(i.id, &self.save_ctxt))
1312             .collect();
1313         let span = self.span_from_span(span);
1314
1315         self.dumper.dump_def(
1316             &Access {
1317                 public: true,
1318                 reachable: true,
1319             },
1320             Def {
1321                 kind: DefKind::Mod,
1322                 id: data_id,
1323                 name: String::new(),
1324                 qualname,
1325                 span,
1326                 value: filename.to_string(),
1327                 children,
1328                 parent: None,
1329                 decl_id: None,
1330                 docs: self.save_ctxt.docs_for_attrs(attrs),
1331                 sig: None,
1332                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1333             },
1334         );
1335         self.nest_scope(id, |v| visit::walk_mod(v, m));
1336     }
1337
1338     fn visit_item(&mut self, item: &'l ast::Item) {
1339         use syntax::ast::ItemKind::*;
1340         self.process_macro_use(item.span);
1341         match item.node {
1342             Use(ref use_tree) => {
1343                 let prefix = ast::Path {
1344                     segments: vec![],
1345                     span: DUMMY_SP,
1346                 };
1347                 self.process_use_tree(use_tree, item.id, item, &prefix);
1348             }
1349             ExternCrate(_) => {
1350                 let name_span = item.ident.span;
1351                 if !self.span.filter_generated(name_span) {
1352                     let span = self.span_from_span(name_span);
1353                     let parent = self.save_ctxt.tcx.hir.opt_local_def_id(item.id)
1354                         .and_then(|id| self.save_ctxt.tcx.parent_def_id(id))
1355                         .map(::id_from_def_id);
1356                     self.dumper.import(
1357                         &Access {
1358                             public: false,
1359                             reachable: false,
1360                         },
1361                         Import {
1362                             kind: ImportKind::ExternCrate,
1363                             ref_id: None,
1364                             span,
1365                             alias_span: None,
1366                             name: item.ident.to_string(),
1367                             value: String::new(),
1368                             parent,
1369                         },
1370                     );
1371                 }
1372             }
1373             Fn(ref decl, .., ref ty_params, ref body) => {
1374                 self.process_fn(item, &decl, ty_params, &body)
1375             }
1376             Static(ref typ, _, ref expr) => self.process_static_or_const_item(item, typ, expr),
1377             Const(ref typ, ref expr) => self.process_static_or_const_item(item, &typ, &expr),
1378             Struct(ref def, ref ty_params) | Union(ref def, ref ty_params) => {
1379                 self.process_struct(item, def, ty_params)
1380             }
1381             Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1382             Impl(.., ref ty_params, ref trait_ref, ref typ, ref impl_items) => {
1383                 self.process_impl(item, ty_params, trait_ref, &typ, impl_items)
1384             }
1385             Trait(_, _, ref generics, ref trait_refs, ref methods) => {
1386                 self.process_trait(item, generics, trait_refs, methods)
1387             }
1388             Mod(ref m) => {
1389                 self.process_mod(item);
1390                 self.nest_scope(item.id, |v| visit::walk_mod(v, m));
1391             }
1392             Ty(ref ty, ref ty_params) => {
1393                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
1394                 let value = ty_to_string(&ty);
1395                 if !self.span.filter_generated(item.ident.span) {
1396                     let span = self.span_from_span(item.ident.span);
1397                     let id = ::id_from_node_id(item.id, &self.save_ctxt);
1398
1399                     self.dumper.dump_def(
1400                         &access_from!(self.save_ctxt, item),
1401                         Def {
1402                             kind: DefKind::Type,
1403                             id,
1404                             span,
1405                             name: item.ident.to_string(),
1406                             qualname: qualname.clone(),
1407                             value,
1408                             parent: None,
1409                             children: vec![],
1410                             decl_id: None,
1411                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1412                             sig: sig::item_signature(item, &self.save_ctxt),
1413                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1414                         },
1415                     );
1416                 }
1417
1418                 self.visit_ty(&ty);
1419                 self.process_generic_params(ty_params, &qualname, item.id);
1420             }
1421             Existential(ref _bounds, ref ty_params) => {
1422                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
1423                 // FIXME do something with _bounds
1424                 let value = String::new();
1425                 if !self.span.filter_generated(item.ident.span) {
1426                     let span = self.span_from_span(item.ident.span);
1427                     let id = ::id_from_node_id(item.id, &self.save_ctxt);
1428
1429                     self.dumper.dump_def(
1430                         &access_from!(self.save_ctxt, item),
1431                         Def {
1432                             kind: DefKind::Type,
1433                             id,
1434                             span,
1435                             name: item.ident.to_string(),
1436                             qualname: qualname.clone(),
1437                             value,
1438                             parent: None,
1439                             children: vec![],
1440                             decl_id: None,
1441                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1442                             sig: sig::item_signature(item, &self.save_ctxt),
1443                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1444                         },
1445                     );
1446                 }
1447
1448                 self.process_generic_params(ty_params, &qualname, item.id);
1449             }
1450             Mac(_) => (),
1451             _ => visit::walk_item(self, item),
1452         }
1453     }
1454
1455     fn visit_generics(&mut self, generics: &'l ast::Generics) {
1456         for param in &generics.params {
1457             if let ast::GenericParamKind::Type { ref default, .. } = param.kind {
1458                 self.process_bounds(&param.bounds);
1459                 if let Some(ref ty) = default {
1460                     self.visit_ty(&ty);
1461                 }
1462             }
1463         }
1464         for pred in &generics.where_clause.predicates {
1465             if let ast::WherePredicate::BoundPredicate(ref wbp) = *pred {
1466                 self.process_bounds(&wbp.bounds);
1467                 self.visit_ty(&wbp.bounded_ty);
1468             }
1469         }
1470     }
1471
1472     fn visit_ty(&mut self, t: &'l ast::Ty) {
1473         self.process_macro_use(t.span);
1474         match t.node {
1475             ast::TyKind::Path(_, ref path) => {
1476                 if generated_code(t.span) {
1477                     return;
1478                 }
1479
1480                 if let Some(id) = self.lookup_def_id(t.id) {
1481                     let sub_span = path.segments.last().unwrap().ident.span;
1482                     let span = self.span_from_span(sub_span);
1483                     self.dumper.dump_ref(Ref {
1484                         kind: RefKind::Type,
1485                         span,
1486                         ref_id: ::id_from_def_id(id),
1487                     });
1488                 }
1489
1490                 self.write_sub_paths_truncated(path);
1491                 visit::walk_path(self, path);
1492             }
1493             ast::TyKind::Array(ref element, ref length) => {
1494                 self.visit_ty(element);
1495                 self.nest_tables(length.id, |v| v.visit_expr(&length.value));
1496             }
1497             _ => visit::walk_ty(self, t),
1498         }
1499     }
1500
1501     fn visit_expr(&mut self, ex: &'l ast::Expr) {
1502         debug!("visit_expr {:?}", ex.node);
1503         self.process_macro_use(ex.span);
1504         match ex.node {
1505             ast::ExprKind::Struct(ref path, ref fields, ref base) => {
1506                 let hir_expr = self.save_ctxt.tcx.hir.expect_expr(ex.id);
1507                 let adt = match self.save_ctxt.tables.expr_ty_opt(&hir_expr) {
1508                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1509                     _ => {
1510                         visit::walk_expr(self, ex);
1511                         return;
1512                     }
1513                 };
1514                 let def = self.save_ctxt.get_path_def(hir_expr.id);
1515                 self.process_struct_lit(ex, path, fields, adt.variant_of_def(def), base)
1516             }
1517             ast::ExprKind::MethodCall(ref seg, ref args) => self.process_method_call(ex, seg, args),
1518             ast::ExprKind::Field(ref sub_ex, _) => {
1519                 self.visit_expr(&sub_ex);
1520
1521                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1522                     down_cast_data!(field_data, RefData, ex.span);
1523                     if !generated_code(ex.span) {
1524                         self.dumper.dump_ref(field_data);
1525                     }
1526                 }
1527             }
1528             ast::ExprKind::Closure(_, _, _, ref decl, ref body, _fn_decl_span) => {
1529                 let id = format!("${}", ex.id);
1530
1531                 // walk arg and return types
1532                 for arg in &decl.inputs {
1533                     self.visit_ty(&arg.ty);
1534                 }
1535
1536                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1537                     self.visit_ty(&ret_ty);
1538                 }
1539
1540                 // walk the body
1541                 self.nest_tables(ex.id, |v| {
1542                     v.process_formals(&decl.inputs, &id);
1543                     v.nest_scope(ex.id, |v| v.visit_expr(body))
1544                 });
1545             }
1546             ast::ExprKind::ForLoop(ref pattern, ref subexpression, ref block, _) => {
1547                 let value = self.span.snippet(subexpression.span);
1548                 self.process_var_decl(pattern, value);
1549                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1550                 self.visit_expr(subexpression);
1551                 visit::walk_block(self, block);
1552             }
1553             ast::ExprKind::WhileLet(ref pats, ref subexpression, ref block, _) => {
1554                 self.process_var_decl_multi(pats);
1555                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1556                 self.visit_expr(subexpression);
1557                 visit::walk_block(self, block);
1558             }
1559             ast::ExprKind::IfLet(ref pats, ref subexpression, ref block, ref opt_else) => {
1560                 self.process_var_decl_multi(pats);
1561                 self.visit_expr(subexpression);
1562                 visit::walk_block(self, block);
1563                 opt_else.as_ref().map(|el| self.visit_expr(el));
1564             }
1565             ast::ExprKind::Repeat(ref element, ref count) => {
1566                 self.visit_expr(element);
1567                 self.nest_tables(count.id, |v| v.visit_expr(&count.value));
1568             }
1569             // In particular, we take this branch for call and path expressions,
1570             // where we'll index the idents involved just by continuing to walk.
1571             _ => visit::walk_expr(self, ex),
1572         }
1573     }
1574
1575     fn visit_mac(&mut self, mac: &'l ast::Mac) {
1576         // These shouldn't exist in the AST at this point, log a span bug.
1577         span_bug!(
1578             mac.span,
1579             "macro invocation should have been expanded out of AST"
1580         );
1581     }
1582
1583     fn visit_pat(&mut self, p: &'l ast::Pat) {
1584         self.process_macro_use(p.span);
1585         self.process_pat(p);
1586     }
1587
1588     fn visit_arm(&mut self, arm: &'l ast::Arm) {
1589         self.process_var_decl_multi(&arm.pats);
1590         match arm.guard {
1591             Some(ast::Guard::If(ref expr)) => self.visit_expr(expr),
1592             _ => {}
1593         }
1594         self.visit_expr(&arm.body);
1595     }
1596
1597     fn visit_path(&mut self, p: &'l ast::Path, id: NodeId) {
1598         self.process_path(id, p);
1599     }
1600
1601     fn visit_stmt(&mut self, s: &'l ast::Stmt) {
1602         self.process_macro_use(s.span);
1603         visit::walk_stmt(self, s)
1604     }
1605
1606     fn visit_local(&mut self, l: &'l ast::Local) {
1607         self.process_macro_use(l.span);
1608         let value = l.init
1609             .as_ref()
1610             .map(|i| self.span.snippet(i.span))
1611             .unwrap_or_default();
1612         self.process_var_decl(&l.pat, value);
1613
1614         // Just walk the initialiser and type (don't want to walk the pattern again).
1615         walk_list!(self, visit_ty, &l.ty);
1616         walk_list!(self, visit_expr, &l.init);
1617     }
1618
1619     fn visit_foreign_item(&mut self, item: &'l ast::ForeignItem) {
1620         let access = access_from!(self.save_ctxt, item);
1621
1622         match item.node {
1623             ast::ForeignItemKind::Fn(ref decl, ref generics) => {
1624                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1625                     down_cast_data!(fn_data, DefData, item.span);
1626
1627                     self.process_generic_params(generics, &fn_data.qualname, item.id);
1628                     self.dumper.dump_def(&access, fn_data);
1629                 }
1630
1631                 for arg in &decl.inputs {
1632                     self.visit_ty(&arg.ty);
1633                 }
1634
1635                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1636                     self.visit_ty(&ret_ty);
1637                 }
1638             }
1639             ast::ForeignItemKind::Static(ref ty, _) => {
1640                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1641                     down_cast_data!(var_data, DefData, item.span);
1642                     self.dumper.dump_def(&access, var_data);
1643                 }
1644
1645                 self.visit_ty(ty);
1646             }
1647             ast::ForeignItemKind::Ty => {
1648                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1649                     down_cast_data!(var_data, DefData, item.span);
1650                     self.dumper.dump_def(&access, var_data);
1651                 }
1652             }
1653             ast::ForeignItemKind::Macro(..) => {}
1654         }
1655     }
1656 }