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::ty::{self, TyCtxt};
  29 use rustc_data_structures::fx::FxHashSet;
  30
  31 use std::path::Path;
  32
  33 use syntax::ast::{self, Attribute, NodeId, PatKind, CRATE_NODE_ID};
  34 use syntax::parse::token;
  35 use syntax::symbol::keywords;
  36 use syntax::visit::{self, Visitor};
  37 use syntax::print::pprust::{
  38     bounds_to_string,
  39     generic_params_to_string,
  40     path_to_string,
  41     ty_to_string
  42 };
  43 use syntax::ptr::P;
  44 use syntax::codemap::{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::{CratePreludeData, Def, DefKind, GlobalCrateId, Import, ImportKind, Ref, RefKind,
  53                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: HashSet<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.clone(),
 109             cur_scope: CRATE_NODE_ID,
 110             // mac_defs: HashSet::new(),
 111             macro_calls: FxHashSet(),
 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().to_string(),
 151                 None => source_file.display().to_string(),
 152             }
 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("<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     // Return all non-empty prefixes of a path.
 173     // For each prefix, we return the span for the last segment in the prefix and
 174     // a str representation of the entire prefix.
 175     fn process_path_prefixes(&self, path: &ast::Path) -> Vec<(Span, String)> {
 176         let segments = &path.segments[if path.is_global() { 1 } else { 0 }..];
 177
 178         let mut result = Vec::with_capacity(segments.len());
 179
 180         let mut segs = vec![];
 181         for (i, seg) in segments.iter().enumerate() {
 182             segs.push(seg.clone());
 183             let sub_path = ast::Path {
 184                 span: seg.ident.span, // span for the last segment
 185                 segments: segs,
 186             };
 187             let qualname = if i == 0 && path.is_global() {
 188                 format!("::{}", path_to_string(&sub_path))
 189             } else {
 190                 path_to_string(&sub_path)
 191             };
 192             result.push((seg.ident.span, qualname));
 193             segs = sub_path.segments;
 194         }
 195
 196         result
 197     }
 198
 199     fn write_sub_paths(&mut self, path: &ast::Path) {
 200         let sub_paths = self.process_path_prefixes(path);
 201         for (span, _) in sub_paths {
 202             let span = self.span_from_span(span);
 203             self.dumper.dump_ref(Ref {
 204                 kind: RefKind::Mod,
 205                 span,
 206                 ref_id: ::null_id(),
 207             });
 208         }
 209     }
 210
 211     // As write_sub_paths, but does not process the last ident in the path (assuming it
 212     // will be processed elsewhere). See note on write_sub_paths about global.
 213     fn write_sub_paths_truncated(&mut self, path: &ast::Path) {
 214         let sub_paths = self.process_path_prefixes(path);
 215         let len = sub_paths.len();
 216         if len <= 1 {
 217             return;
 218         }
 219
 220         for (span, _) in sub_paths.into_iter().take(len - 1) {
 221             let span = self.span_from_span(span);
 222             self.dumper.dump_ref(Ref {
 223                 kind: RefKind::Mod,
 224                 span,
 225                 ref_id: ::null_id(),
 226             });
 227         }
 228     }
 229
 230     // As write_sub_paths, but expects a path of the form module_path::trait::method
 231     // Where trait could actually be a struct too.
 232     fn write_sub_path_trait_truncated(&mut self, path: &ast::Path) {
 233         let sub_paths = self.process_path_prefixes(path);
 234         let len = sub_paths.len();
 235         if len <= 1 {
 236             return;
 237         }
 238         let sub_paths = &sub_paths[..(len - 1)];
 239
 240         // write the trait part of the sub-path
 241         let (ref span, _) = sub_paths[len - 2];
 242         let span = self.span_from_span(*span);
 243         self.dumper.dump_ref(Ref {
 244             kind: RefKind::Type,
 245             ref_id: ::null_id(),
 246             span,
 247         });
 248
 249         // write the other sub-paths
 250         if len <= 2 {
 251             return;
 252         }
 253         let sub_paths = &sub_paths[..len - 2];
 254         for &(ref span, _) in sub_paths {
 255             let span = self.span_from_span(*span);
 256             self.dumper.dump_ref(Ref {
 257                 kind: RefKind::Mod,
 258                 span,
 259                 ref_id: ::null_id(),
 260             });
 261         }
 262     }
 263
 264     fn lookup_def_id(&self, ref_id: NodeId) -> Option<DefId> {
 265         match self.save_ctxt.get_path_def(ref_id) {
 266             HirDef::PrimTy(..) | HirDef::SelfTy(..) | HirDef::Err => None,
 267             def => Some(def.def_id()),
 268         }
 269     }
 270
 271     fn process_formals(&mut self, formals: &'l [ast::Arg], qualname: &str) {
 272         for arg in formals {
 273             self.visit_pat(&arg.pat);
 274             let mut collector = PathCollector::new();
 275             collector.visit_pat(&arg.pat);
 276             let span_utils = self.span.clone();
 277
 278             for (id, ident, ..) in collector.collected_idents {
 279                 let hir_id = self.tcx.hir.node_to_hir_id(id);
 280                 let typ = match self.save_ctxt.tables.node_id_to_type_opt(hir_id) {
 281                     Some(s) => s.to_string(),
 282                     None => continue,
 283                 };
 284                 let sub_span = span_utils.span_for_last_ident(ident.span);
 285                 if !self.span.filter_generated(sub_span, ident.span) {
 286                     let id = ::id_from_node_id(id, &self.save_ctxt);
 287                     let span = self.span_from_span(sub_span.expect("No span found for variable"));
 288
 289                     self.dumper.dump_def(
 290                         &Access {
 291                             public: false,
 292                             reachable: false,
 293                         },
 294                         Def {
 295                             kind: DefKind::Local,
 296                             id,
 297                             span,
 298                             name: ident.to_string(),
 299                             qualname: format!("{}::{}", qualname, ident.to_string()),
 300                             value: typ,
 301                             parent: None,
 302                             children: vec![],
 303                             decl_id: None,
 304                             docs: String::new(),
 305                             sig: None,
 306                             attributes: vec![],
 307                         },
 308                     );
 309                 }
 310             }
 311         }
 312     }
 313
 314     fn process_method(
 315         &mut self,
 316         sig: &'l ast::MethodSig,
 317         body: Option<&'l ast::Block>,
 318         id: ast::NodeId,
 319         ident: ast::Ident,
 320         generics: &'l ast::Generics,
 321         vis: ast::Visibility,
 322         span: Span,
 323     ) {
 324         debug!("process_method: {}:{}", id, ident);
 325
 326         if let Some(mut method_data) = self.save_ctxt.get_method_data(id, ident.name, span) {
 327             let sig_str = ::make_signature(&sig.decl, &generics);
 328             if body.is_some() {
 329                 self.nest_tables(
 330                     id,
 331                     |v| v.process_formals(&sig.decl.inputs, &method_data.qualname),
 332                 );
 333             }
 334
 335             self.process_generic_params(&generics, span, &method_data.qualname, id);
 336
 337             method_data.value = sig_str;
 338             method_data.sig = sig::method_signature(id, ident, generics, sig, &self.save_ctxt);
 339             self.dumper.dump_def(&access_from!(self.save_ctxt, vis, id), method_data);
 340         }
 341
 342         // walk arg and return types
 343         for arg in &sig.decl.inputs {
 344             self.visit_ty(&arg.ty);
 345         }
 346
 347         if let ast::FunctionRetTy::Ty(ref ret_ty) = sig.decl.output {
 348             self.visit_ty(ret_ty);
 349         }
 350
 351         // walk the fn body
 352         if let Some(body) = body {
 353             self.nest_tables(id, |v| v.nest_scope(id, |v| v.visit_block(body)));
 354         }
 355     }
 356
 357     fn process_struct_field_def(&mut self, field: &ast::StructField, parent_id: NodeId) {
 358         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 359         if let Some(field_data) = field_data {
 360             self.dumper.dump_def(&access_from!(self.save_ctxt, field), field_data);
 361         }
 362     }
 363
 364     // Dump generic params bindings, then visit_generics
 365     fn process_generic_params(
 366         &mut self,
 367         generics: &'l ast::Generics,
 368         full_span: Span,
 369         prefix: &str,
 370         id: NodeId,
 371     ) {
 372         for param in &generics.params {
 373             match param.kind {
 374                 ast::GenericParamKind::Lifetime { .. } => {}
 375                 ast::GenericParamKind::Type { .. } => {
 376                     let param_ss = param.ident.span;
 377                     let name = escape(self.span.snippet(param_ss));
 378                     // Append $id to name to make sure each one is unique.
 379                     let qualname = format!("{}::{}${}", prefix, name, id);
 380                     if !self.span.filter_generated(Some(param_ss), full_span) {
 381                         let id = ::id_from_node_id(param.id, &self.save_ctxt);
 382                         let span = self.span_from_span(param_ss);
 383
 384                         self.dumper.dump_def(
 385                             &Access {
 386                                 public: false,
 387                                 reachable: false,
 388                             },
 389                             Def {
 390                                 kind: DefKind::Type,
 391                                 id,
 392                                 span,
 393                                 name,
 394                                 qualname,
 395                                 value: String::new(),
 396                                 parent: None,
 397                                 children: vec![],
 398                                 decl_id: None,
 399                                 docs: String::new(),
 400                                 sig: None,
 401                                 attributes: vec![],
 402                             },
 403                         );
 404                     }
 405                 }
 406             }
 407         }
 408         self.visit_generics(generics);
 409     }
 410
 411     fn process_fn(
 412         &mut self,
 413         item: &'l ast::Item,
 414         decl: &'l ast::FnDecl,
 415         ty_params: &'l ast::Generics,
 416         body: &'l ast::Block,
 417     ) {
 418         if let Some(fn_data) = self.save_ctxt.get_item_data(item) {
 419             down_cast_data!(fn_data, DefData, item.span);
 420             self.nest_tables(
 421                 item.id,
 422                 |v| v.process_formals(&decl.inputs, &fn_data.qualname),
 423             );
 424             self.process_generic_params(ty_params, item.span, &fn_data.qualname, item.id);
 425             self.dumper.dump_def(&access_from!(self.save_ctxt, item), fn_data);
 426         }
 427
 428         for arg in &decl.inputs {
 429             self.visit_ty(&arg.ty);
 430         }
 431
 432         if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
 433             self.visit_ty(&ret_ty);
 434         }
 435
 436         self.nest_tables(item.id, |v| v.nest_scope(item.id, |v| v.visit_block(&body)));
 437     }
 438
 439     fn process_static_or_const_item(
 440         &mut self,
 441         item: &'l ast::Item,
 442         typ: &'l ast::Ty,
 443         expr: &'l ast::Expr,
 444     ) {
 445         self.nest_tables(item.id, |v| {
 446             if let Some(var_data) = v.save_ctxt.get_item_data(item) {
 447                 down_cast_data!(var_data, DefData, item.span);
 448                 v.dumper.dump_def(&access_from!(v.save_ctxt, item), var_data);
 449             }
 450             v.visit_ty(&typ);
 451             v.visit_expr(expr);
 452         });
 453     }
 454
 455     fn process_assoc_const(
 456         &mut self,
 457         id: ast::NodeId,
 458         name: ast::Name,
 459         span: Span,
 460         typ: &'l ast::Ty,
 461         expr: Option<&'l ast::Expr>,
 462         parent_id: DefId,
 463         vis: ast::Visibility,
 464         attrs: &'l [Attribute],
 465     ) {
 466         let qualname = format!("::{}", self.tcx.node_path_str(id));
 467
 468         let sub_span = self.span.sub_span_after_keyword(span, keywords::Const);
 469
 470         if !self.span.filter_generated(sub_span, span) {
 471             let sig = sig::assoc_const_signature(id, name, typ, expr, &self.save_ctxt);
 472             let span = self.span_from_span(sub_span.expect("No span found for variable"));
 473
 474             self.dumper.dump_def(
 475                 &access_from!(self.save_ctxt, vis, id),
 476                 Def {
 477                     kind: DefKind::Const,
 478                     id: ::id_from_node_id(id, &self.save_ctxt),
 479                     span,
 480                     name: name.to_string(),
 481                     qualname,
 482                     value: ty_to_string(&typ),
 483                     parent: Some(::id_from_def_id(parent_id)),
 484                     children: vec![],
 485                     decl_id: None,
 486                     docs: self.save_ctxt.docs_for_attrs(attrs),
 487                     sig,
 488                     attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
 489                 },
 490             );
 491         }
 492
 493         // walk type and init value
 494         self.visit_ty(typ);
 495         if let Some(expr) = expr {
 496             self.visit_expr(expr);
 497         }
 498     }
 499
 500     // FIXME tuple structs should generate tuple-specific data.
 501     fn process_struct(
 502         &mut self,
 503         item: &'l ast::Item,
 504         def: &'l ast::VariantData,
 505         ty_params: &'l ast::Generics,
 506     ) {
 507         debug!("process_struct {:?} {:?}", item, item.span);
 508         let name = item.ident.to_string();
 509         let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 510
 511         let (kind, keyword) = match item.node {
 512             ast::ItemKind::Struct(_, _) => (DefKind::Struct, keywords::Struct),
 513             ast::ItemKind::Union(_, _) => (DefKind::Union, keywords::Union),
 514             _ => unreachable!(),
 515         };
 516
 517         let sub_span = self.span.sub_span_after_keyword(item.span, keyword);
 518         let (value, fields) = match item.node {
 519             ast::ItemKind::Struct(ast::VariantData::Struct(ref fields, _), _) |
 520             ast::ItemKind::Union(ast::VariantData::Struct(ref fields, _), _) => {
 521                 let include_priv_fields = !self.save_ctxt.config.pub_only;
 522                 let fields_str = fields
 523                     .iter()
 524                     .enumerate()
 525                     .filter_map(|(i, f)| {
 526                         if include_priv_fields || f.vis.node.is_pub() {
 527                             f.ident
 528                                 .map(|i| i.to_string())
 529                                 .or_else(|| Some(i.to_string()))
 530                         } else {
 531                             None
 532                         }
 533                     })
 534                     .collect::<Vec<_>>()
 535                     .join(", ");
 536                 let value = format!("{} {{ {} }}", name, fields_str);
 537                 (
 538                     value,
 539                     fields
 540                         .iter()
 541                         .map(|f| ::id_from_node_id(f.id, &self.save_ctxt))
 542                         .collect(),
 543                 )
 544             }
 545             _ => (String::new(), vec![]),
 546         };
 547
 548         if !self.span.filter_generated(sub_span, item.span) {
 549             let span = self.span_from_span(sub_span.expect("No span found for struct"));
 550             self.dumper.dump_def(
 551                 &access_from!(self.save_ctxt, item),
 552                 Def {
 553                     kind,
 554                     id: ::id_from_node_id(item.id, &self.save_ctxt),
 555                     span,
 556                     name,
 557                     qualname: qualname.clone(),
 558                     value,
 559                     parent: None,
 560                     children: fields,
 561                     decl_id: None,
 562                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 563                     sig: sig::item_signature(item, &self.save_ctxt),
 564                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 565                 },
 566             );
 567         }
 568
 569         for field in def.fields() {
 570             self.process_struct_field_def(field, item.id);
 571             self.visit_ty(&field.ty);
 572         }
 573
 574         self.process_generic_params(ty_params, item.span, &qualname, item.id);
 575     }
 576
 577     fn process_enum(
 578         &mut self,
 579         item: &'l ast::Item,
 580         enum_definition: &'l ast::EnumDef,
 581         ty_params: &'l ast::Generics,
 582     ) {
 583         let enum_data = self.save_ctxt.get_item_data(item);
 584         let enum_data = match enum_data {
 585             None => return,
 586             Some(data) => data,
 587         };
 588         down_cast_data!(enum_data, DefData, item.span);
 589
 590         let access = access_from!(self.save_ctxt, item);
 591
 592         for variant in &enum_definition.variants {
 593             let name = variant.node.ident.name.to_string();
 594             let mut qualname = enum_data.qualname.clone();
 595             qualname.push_str("::");
 596             qualname.push_str(&name);
 597
 598             match variant.node.data {
 599                 ast::VariantData::Struct(ref fields, _) => {
 600                     let sub_span = self.span.span_for_first_ident(variant.span);
 601                     let fields_str = fields
 602                         .iter()
 603                         .enumerate()
 604                         .map(|(i, f)| {
 605                             f.ident.map(|i| i.to_string()).unwrap_or(i.to_string())
 606                         })
 607                         .collect::<Vec<_>>()
 608                         .join(", ");
 609                     let value = format!("{}::{} {{ {} }}", enum_data.name, name, fields_str);
 610                     if !self.span.filter_generated(sub_span, variant.span) {
 611                         let span = self
 612                             .span_from_span(sub_span.expect("No span found for struct variant"));
 613                         let id = ::id_from_node_id(variant.node.data.id(), &self.save_ctxt);
 614                         let parent = Some(::id_from_node_id(item.id, &self.save_ctxt));
 615
 616                         self.dumper.dump_def(
 617                             &access,
 618                             Def {
 619                                 kind: DefKind::StructVariant,
 620                                 id,
 621                                 span,
 622                                 name,
 623                                 qualname,
 624                                 value,
 625                                 parent,
 626                                 children: vec![],
 627                                 decl_id: None,
 628                                 docs: self.save_ctxt.docs_for_attrs(&variant.node.attrs),
 629                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 630                                 attributes: lower_attributes(
 631                                     variant.node.attrs.clone(),
 632                                     &self.save_ctxt,
 633                                 ),
 634                             },
 635                         );
 636                     }
 637                 }
 638                 ref v => {
 639                     let sub_span = self.span.span_for_first_ident(variant.span);
 640                     let mut value = format!("{}::{}", enum_data.name, name);
 641                     if let &ast::VariantData::Tuple(ref fields, _) = v {
 642                         value.push('(');
 643                         value.push_str(&fields
 644                             .iter()
 645                             .map(|f| ty_to_string(&f.ty))
 646                             .collect::<Vec<_>>()
 647                             .join(", "));
 648                         value.push(')');
 649                     }
 650                     if !self.span.filter_generated(sub_span, variant.span) {
 651                         let span =
 652                             self.span_from_span(sub_span.expect("No span found for tuple variant"));
 653                         let id = ::id_from_node_id(variant.node.data.id(), &self.save_ctxt);
 654                         let parent = Some(::id_from_node_id(item.id, &self.save_ctxt));
 655
 656                         self.dumper.dump_def(
 657                             &access,
 658                             Def {
 659                                 kind: DefKind::TupleVariant,
 660                                 id,
 661                                 span,
 662                                 name,
 663                                 qualname,
 664                                 value,
 665                                 parent,
 666                                 children: vec![],
 667                                 decl_id: None,
 668                                 docs: self.save_ctxt.docs_for_attrs(&variant.node.attrs),
 669                                 sig: sig::variant_signature(variant, &self.save_ctxt),
 670                                 attributes: lower_attributes(
 671                                     variant.node.attrs.clone(),
 672                                     &self.save_ctxt,
 673                                 ),
 674                             },
 675                         );
 676                     }
 677                 }
 678             }
 679
 680
 681             for field in variant.node.data.fields() {
 682                 self.process_struct_field_def(field, variant.node.data.id());
 683                 self.visit_ty(&field.ty);
 684             }
 685         }
 686         self.process_generic_params(ty_params, item.span, &enum_data.qualname, item.id);
 687         self.dumper.dump_def(&access, enum_data);
 688     }
 689
 690     fn process_impl(
 691         &mut self,
 692         item: &'l ast::Item,
 693         type_parameters: &'l ast::Generics,
 694         trait_ref: &'l Option<ast::TraitRef>,
 695         typ: &'l ast::Ty,
 696         impl_items: &'l [ast::ImplItem],
 697     ) {
 698         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 699             if let super::Data::RelationData(rel, imp) = impl_data {
 700                 self.dumper.dump_relation(rel);
 701                 self.dumper.dump_impl(imp);
 702             } else {
 703                 span_bug!(item.span, "unexpected data kind: {:?}", impl_data);
 704             }
 705         }
 706         self.visit_ty(&typ);
 707         if let &Some(ref trait_ref) = trait_ref {
 708             self.process_path(trait_ref.ref_id, &trait_ref.path);
 709         }
 710         self.process_generic_params(type_parameters, item.span, "", item.id);
 711         for impl_item in impl_items {
 712             let map = &self.tcx.hir;
 713             self.process_impl_item(impl_item, map.local_def_id(item.id));
 714         }
 715     }
 716
 717     fn process_trait(
 718         &mut self,
 719         item: &'l ast::Item,
 720         generics: &'l ast::Generics,
 721         trait_refs: &'l ast::GenericBounds,
 722         methods: &'l [ast::TraitItem],
 723     ) {
 724         let name = item.ident.to_string();
 725         let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 726         let mut val = name.clone();
 727         if !generics.params.is_empty() {
 728             val.push_str(&generic_params_to_string(&generics.params));
 729         }
 730         if !trait_refs.is_empty() {
 731             val.push_str(": ");
 732             val.push_str(&bounds_to_string(trait_refs));
 733         }
 734         let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Trait);
 735         if !self.span.filter_generated(sub_span, item.span) {
 736             let id = ::id_from_node_id(item.id, &self.save_ctxt);
 737             let span = self.span_from_span(sub_span.expect("No span found for trait"));
 738             let children = methods
 739                 .iter()
 740                 .map(|i| ::id_from_node_id(i.id, &self.save_ctxt))
 741                 .collect();
 742             self.dumper.dump_def(
 743                 &access_from!(self.save_ctxt, item),
 744                 Def {
 745                     kind: DefKind::Trait,
 746                     id,
 747                     span,
 748                     name,
 749                     qualname: qualname.clone(),
 750                     value: val,
 751                     parent: None,
 752                     children,
 753                     decl_id: None,
 754                     docs: self.save_ctxt.docs_for_attrs(&item.attrs),
 755                     sig: sig::item_signature(item, &self.save_ctxt),
 756                     attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
 757                 },
 758             );
 759         }
 760
 761         // super-traits
 762         for super_bound in trait_refs.iter() {
 763             let trait_ref = match *super_bound {
 764                 ast::GenericBound::Trait(ref trait_ref, _) => trait_ref,
 765                 ast::GenericBound::Outlives(..) => continue,
 766             };
 767
 768             let trait_ref = &trait_ref.trait_ref;
 769             if let Some(id) = self.lookup_def_id(trait_ref.ref_id) {
 770                 let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
 771                 if !self.span.filter_generated(sub_span, trait_ref.path.span) {
 772                     let span = self.span_from_span(sub_span.expect("No span found for trait ref"));
 773                     self.dumper.dump_ref(Ref {
 774                         kind: RefKind::Type,
 775                         span,
 776                         ref_id: ::id_from_def_id(id),
 777                     });
 778                 }
 779
 780                 if !self.span.filter_generated(sub_span, trait_ref.path.span) {
 781                     let sub_span = self.span_from_span(sub_span.expect("No span for inheritance"));
 782                     self.dumper.dump_relation(Relation {
 783                         kind: RelationKind::SuperTrait,
 784                         span: sub_span,
 785                         from: ::id_from_def_id(id),
 786                         to: ::id_from_node_id(item.id, &self.save_ctxt),
 787                     });
 788                 }
 789             }
 790         }
 791
 792         // walk generics and methods
 793         self.process_generic_params(generics, item.span, &qualname, item.id);
 794         for method in methods {
 795             let map = &self.tcx.hir;
 796             self.process_trait_item(method, map.local_def_id(item.id))
 797         }
 798     }
 799
 800     // `item` is the module in question, represented as an item.
 801     fn process_mod(&mut self, item: &ast::Item) {
 802         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 803             down_cast_data!(mod_data, DefData, item.span);
 804             self.dumper.dump_def(&access_from!(self.save_ctxt, item), mod_data);
 805         }
 806     }
 807
 808     fn dump_path_ref(&mut self, id: NodeId, path: &ast::Path) {
 809         let path_data = self.save_ctxt.get_path_data(id, path);
 810         if let Some(path_data) = path_data {
 811             self.dumper.dump_ref(path_data);
 812         }
 813     }
 814
 815     fn process_path(&mut self, id: NodeId, path: &'l ast::Path) {
 816         debug!("process_path {:?}", path);
 817         if generated_code(path.span) {
 818             return;
 819         }
 820         self.dump_path_ref(id, path);
 821
 822         // Type arguments
 823         for seg in &path.segments {
 824             if let Some(ref generic_args) = seg.args {
 825                 match **generic_args {
 826                     ast::GenericArgs::AngleBracketed(ref data) => {
 827                         data.args.iter().for_each(|arg| match arg {
 828                             ast::GenericArg::Type(ty) => self.visit_ty(ty),
 829                             _ => {}
 830                         });
 831                     }
 832                     ast::GenericArgs::Parenthesized(ref data) => {
 833                         for t in &data.inputs {
 834                             self.visit_ty(t);
 835                         }
 836                         if let Some(ref t) = data.output {
 837                             self.visit_ty(t);
 838                         }
 839                     }
 840                 }
 841             }
 842         }
 843
 844         // Modules or types in the path prefix.
 845         match self.save_ctxt.get_path_def(id) {
 846             HirDef::Method(did) => {
 847                 let ti = self.tcx.associated_item(did);
 848                 if ti.kind == ty::AssociatedKind::Method && ti.method_has_self_argument {
 849                     self.write_sub_path_trait_truncated(path);
 850                 }
 851             }
 852             HirDef::Fn(..) |
 853             HirDef::Const(..) |
 854             HirDef::Static(..) |
 855             HirDef::StructCtor(..) |
 856             HirDef::VariantCtor(..) |
 857             HirDef::AssociatedConst(..) |
 858             HirDef::Local(..) |
 859             HirDef::Upvar(..) |
 860             HirDef::Struct(..) |
 861             HirDef::Union(..) |
 862             HirDef::Variant(..) |
 863             HirDef::TyAlias(..) |
 864             HirDef::AssociatedTy(..) => self.write_sub_paths_truncated(path),
 865             _ => {}
 866         }
 867     }
 868
 869     fn process_struct_lit(
 870         &mut self,
 871         ex: &'l ast::Expr,
 872         path: &'l ast::Path,
 873         fields: &'l [ast::Field],
 874         variant: &'l ty::VariantDef,
 875         base: &'l Option<P<ast::Expr>>,
 876     ) {
 877         self.write_sub_paths_truncated(path);
 878
 879         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 880             down_cast_data!(struct_lit_data, RefData, ex.span);
 881             if !generated_code(ex.span) {
 882                 self.dumper.dump_ref(struct_lit_data);
 883             }
 884
 885             for field in fields {
 886                 if let Some(field_data) = self.save_ctxt.get_field_ref_data(field, variant) {
 887                     self.dumper.dump_ref(field_data);
 888                 }
 889
 890                 self.visit_expr(&field.expr)
 891             }
 892         }
 893
 894         walk_list!(self, visit_expr, base);
 895     }
 896
 897     fn process_method_call(
 898         &mut self,
 899         ex: &'l ast::Expr,
 900         seg: &'l ast::PathSegment,
 901         args: &'l [P<ast::Expr>],
 902     ) {
 903         debug!("process_method_call {:?} {:?}", ex, ex.span);
 904         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 905             down_cast_data!(mcd, RefData, ex.span);
 906             if !generated_code(ex.span) {
 907                 self.dumper.dump_ref(mcd);
 908             }
 909         }
 910
 911         // Explicit types in the turbo-fish.
 912         if let Some(ref generic_args) = seg.args {
 913             if let ast::GenericArgs::AngleBracketed(ref data) = **generic_args {
 914                 data.args.iter().for_each(|arg| match arg {
 915                     ast::GenericArg::Type(ty) => self.visit_ty(ty),
 916                     _ => {}
 917                 });
 918             }
 919         }
 920
 921         // walk receiver and args
 922         walk_list!(self, visit_expr, args);
 923     }
 924
 925     fn process_pat(&mut self, p: &'l ast::Pat) {
 926         match p.node {
 927             PatKind::Struct(ref _path, ref fields, _) => {
 928                 // FIXME do something with _path?
 929                 let hir_id = self.tcx.hir.node_to_hir_id(p.id);
 930                 let adt = match self.save_ctxt.tables.node_id_to_type_opt(hir_id) {
 931                     Some(ty) => ty.ty_adt_def().unwrap(),
 932                     None => {
 933                         visit::walk_pat(self, p);
 934                         return;
 935                     }
 936                 };
 937                 let variant = adt.variant_of_def(self.save_ctxt.get_path_def(p.id));
 938
 939                 for &Spanned { node: ref field, span } in fields {
 940                     let sub_span = self.span.span_for_first_ident(span);
 941                     if let Some(index) = self.tcx.find_field_index(field.ident, variant) {
 942                         if !self.span.filter_generated(sub_span, span) {
 943                             let span =
 944                                 self.span_from_span(sub_span.expect("No span fund for var ref"));
 945                             self.dumper.dump_ref(Ref {
 946                                 kind: RefKind::Variable,
 947                                 span,
 948                                 ref_id: ::id_from_def_id(variant.fields[index].did),
 949                             });
 950                         }
 951                     }
 952                     self.visit_pat(&field.pat);
 953                 }
 954             }
 955             _ => visit::walk_pat(self, p),
 956         }
 957     }
 958
 959     fn process_var_decl_multi(&mut self, pats: &'l [P<ast::Pat>]) {
 960         let mut collector = PathCollector::new();
 961         for pattern in pats {
 962             // collect paths from the arm's patterns
 963             collector.visit_pat(&pattern);
 964             self.visit_pat(&pattern);
 965         }
 966
 967         // process collected paths
 968         for (id, ident, immut) in collector.collected_idents {
 969             match self.save_ctxt.get_path_def(id) {
 970                 HirDef::Local(id) => {
 971                     let mut value = if immut == ast::Mutability::Immutable {
 972                         self.span.snippet(ident.span).to_string()
 973                     } else {
 974                         "<mutable>".to_string()
 975                     };
 976                     let hir_id = self.tcx.hir.node_to_hir_id(id);
 977                     let typ = self.save_ctxt
 978                         .tables
 979                         .node_id_to_type_opt(hir_id)
 980                         .map(|t| t.to_string())
 981                         .unwrap_or(String::new());
 982                     value.push_str(": ");
 983                     value.push_str(&typ);
 984
 985                     if !self.span.filter_generated(Some(ident.span), ident.span) {
 986                         let qualname = format!("{}${}", ident.to_string(), id);
 987                         let id = ::id_from_node_id(id, &self.save_ctxt);
 988                         let span = self.span_from_span(ident.span);
 989
 990                         self.dumper.dump_def(
 991                             &Access {
 992                                 public: false,
 993                                 reachable: false,
 994                             },
 995                             Def {
 996                                 kind: DefKind::Local,
 997                                 id,
 998                                 span,
 999                                 name: ident.to_string(),
1000                                 qualname,
1001                                 value: typ,
1002                                 parent: None,
1003                                 children: vec![],
1004                                 decl_id: None,
1005                                 docs: String::new(),
1006                                 sig: None,
1007                                 attributes: vec![],
1008                             },
1009                         );
1010                     }
1011                 }
1012                 HirDef::StructCtor(..) |
1013                 HirDef::VariantCtor(..) |
1014                 HirDef::Const(..) |
1015                 HirDef::AssociatedConst(..) |
1016                 HirDef::Struct(..) |
1017                 HirDef::Variant(..) |
1018                 HirDef::TyAlias(..) |
1019                 HirDef::AssociatedTy(..) |
1020                 HirDef::SelfTy(..) => {
1021                     self.dump_path_ref(id, &ast::Path::from_ident(ident));
1022                 }
1023                 def => error!(
1024                     "unexpected definition kind when processing collected idents: {:?}",
1025                     def
1026                 ),
1027             }
1028         }
1029
1030         for (id, ref path) in collector.collected_paths {
1031             self.process_path(id, path);
1032         }
1033     }
1034
1035     fn process_var_decl(&mut self, p: &'l ast::Pat, value: String) {
1036         // The local could declare multiple new vars, we must walk the
1037         // pattern and collect them all.
1038         let mut collector = PathCollector::new();
1039         collector.visit_pat(&p);
1040         self.visit_pat(&p);
1041
1042         for (id, ident, immut) in collector.collected_idents {
1043             let mut value = match immut {
1044                 ast::Mutability::Immutable => value.to_string(),
1045                 _ => String::new(),
1046             };
1047             let hir_id = self.tcx.hir.node_to_hir_id(id);
1048             let typ = match self.save_ctxt.tables.node_id_to_type_opt(hir_id) {
1049                 Some(typ) => {
1050                     let typ = typ.to_string();
1051                     if !value.is_empty() {
1052                         value.push_str(": ");
1053                     }
1054                     value.push_str(&typ);
1055                     typ
1056                 }
1057                 None => String::new(),
1058             };
1059
1060             // Get the span only for the name of the variable (I hope the path
1061             // is only ever a variable name, but who knows?).
1062             let sub_span = self.span.span_for_last_ident(ident.span);
1063             // Rust uses the id of the pattern for var lookups, so we'll use it too.
1064             if !self.span.filter_generated(sub_span, ident.span) {
1065                 let qualname = format!("{}${}", ident.to_string(), id);
1066                 let id = ::id_from_node_id(id, &self.save_ctxt);
1067                 let span = self.span_from_span(sub_span.expect("No span found for variable"));
1068
1069                 self.dumper.dump_def(
1070                     &Access {
1071                         public: false,
1072                         reachable: false,
1073                     },
1074                     Def {
1075                         kind: DefKind::Local,
1076                         id,
1077                         span,
1078                         name: ident.to_string(),
1079                         qualname,
1080                         value: typ,
1081                         parent: None,
1082                         children: vec![],
1083                         decl_id: None,
1084                         docs: String::new(),
1085                         sig: None,
1086                         attributes: vec![],
1087                     },
1088                 );
1089             }
1090         }
1091     }
1092
1093     /// Extract macro use and definition information from the AST node defined
1094     /// by the given NodeId, using the expansion information from the node's
1095     /// span.
1096     ///
1097     /// If the span is not macro-generated, do nothing, else use callee and
1098     /// callsite spans to record macro definition and use data, using the
1099     /// mac_uses and mac_defs sets to prevent multiples.
1100     fn process_macro_use(&mut self, span: Span) {
1101         let source_span = span.source_callsite();
1102         if self.macro_calls.contains(&source_span) {
1103             return;
1104         }
1105         self.macro_calls.insert(source_span);
1106
1107         let data = match self.save_ctxt.get_macro_use_data(span) {
1108             None => return,
1109             Some(data) => data,
1110         };
1111
1112         self.dumper.macro_use(data);
1113
1114         // FIXME write the macro def
1115         // let mut hasher = DefaultHasher::new();
1116         // data.callee_span.hash(&mut hasher);
1117         // let hash = hasher.finish();
1118         // let qualname = format!("{}::{}", data.name, hash);
1119         // Don't write macro definition for imported macros
1120         // if !self.mac_defs.contains(&data.callee_span)
1121         //     && !data.imported {
1122         //     self.mac_defs.insert(data.callee_span);
1123         //     if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
1124         //         self.dumper.macro_data(MacroData {
1125         //             span: sub_span,
1126         //             name: data.name.clone(),
1127         //             qualname: qualname.clone(),
1128         //             // FIXME where do macro docs come from?
1129         //             docs: String::new(),
1130         //         }.lower(self.tcx));
1131         //     }
1132         // }
1133     }
1134
1135     fn process_trait_item(&mut self, trait_item: &'l ast::TraitItem, trait_id: DefId) {
1136         self.process_macro_use(trait_item.span);
1137         let vis_span = trait_item.span.shrink_to_lo();
1138         match trait_item.node {
1139             ast::TraitItemKind::Const(ref ty, ref expr) => {
1140                 self.process_assoc_const(
1141                     trait_item.id,
1142                     trait_item.ident.name,
1143                     trait_item.span,
1144                     &ty,
1145                     expr.as_ref().map(|e| &**e),
1146                     trait_id,
1147                     respan(vis_span, ast::VisibilityKind::Public),
1148                     &trait_item.attrs,
1149                 );
1150             }
1151             ast::TraitItemKind::Method(ref sig, ref body) => {
1152                 self.process_method(
1153                     sig,
1154                     body.as_ref().map(|x| &**x),
1155                     trait_item.id,
1156                     trait_item.ident,
1157                     &trait_item.generics,
1158                     respan(vis_span, ast::VisibilityKind::Public),
1159                     trait_item.span,
1160                 );
1161             }
1162             ast::TraitItemKind::Type(ref bounds, ref default_ty) => {
1163                 // FIXME do something with _bounds (for type refs)
1164                 let name = trait_item.ident.name.to_string();
1165                 let qualname = format!("::{}", self.tcx.node_path_str(trait_item.id));
1166                 let sub_span = self.span
1167                     .sub_span_after_keyword(trait_item.span, keywords::Type);
1168
1169                 if !self.span.filter_generated(sub_span, trait_item.span) {
1170                     let span = self.span_from_span(sub_span.expect("No span found for assoc type"));
1171                     let id = ::id_from_node_id(trait_item.id, &self.save_ctxt);
1172
1173                     self.dumper.dump_def(
1174                         &Access {
1175                             public: true,
1176                             reachable: true,
1177                         },
1178                         Def {
1179                             kind: DefKind::Type,
1180                             id,
1181                             span,
1182                             name,
1183                             qualname,
1184                             value: self.span.snippet(trait_item.span),
1185                             parent: Some(::id_from_def_id(trait_id)),
1186                             children: vec![],
1187                             decl_id: None,
1188                             docs: self.save_ctxt.docs_for_attrs(&trait_item.attrs),
1189                             sig: sig::assoc_type_signature(
1190                                 trait_item.id,
1191                                 trait_item.ident,
1192                                 Some(bounds),
1193                                 default_ty.as_ref().map(|ty| &**ty),
1194                                 &self.save_ctxt,
1195                             ),
1196                             attributes: lower_attributes(trait_item.attrs.clone(), &self.save_ctxt),
1197                         },
1198                     );
1199                 }
1200
1201                 if let &Some(ref default_ty) = default_ty {
1202                     self.visit_ty(default_ty)
1203                 }
1204             }
1205             ast::TraitItemKind::Macro(_) => {}
1206         }
1207     }
1208
1209     fn process_impl_item(&mut self, impl_item: &'l ast::ImplItem, impl_id: DefId) {
1210         self.process_macro_use(impl_item.span);
1211         match impl_item.node {
1212             ast::ImplItemKind::Const(ref ty, ref expr) => {
1213                 self.process_assoc_const(
1214                     impl_item.id,
1215                     impl_item.ident.name,
1216                     impl_item.span,
1217                     &ty,
1218                     Some(expr),
1219                     impl_id,
1220                     impl_item.vis.clone(),
1221                     &impl_item.attrs,
1222                 );
1223             }
1224             ast::ImplItemKind::Method(ref sig, ref body) => {
1225                 self.process_method(
1226                     sig,
1227                     Some(body),
1228                     impl_item.id,
1229                     impl_item.ident,
1230                     &impl_item.generics,
1231                     impl_item.vis.clone(),
1232                     impl_item.span,
1233                 );
1234             }
1235             ast::ImplItemKind::Type(ref ty) => {
1236                 // FIXME uses of the assoc type should ideally point to this
1237                 // 'def' and the name here should be a ref to the def in the
1238                 // trait.
1239                 self.visit_ty(ty)
1240             }
1241             ast::ImplItemKind::Existential(ref bounds) => {
1242                 // FIXME uses of the assoc type should ideally point to this
1243                 // 'def' and the name here should be a ref to the def in the
1244                 // trait.
1245                 for bound in bounds.iter() {
1246                     if let ast::GenericBound::Trait(trait_ref, _) = bound {
1247                         self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1248                     }
1249                 }
1250             }
1251             ast::ImplItemKind::Macro(_) => {}
1252         }
1253     }
1254
1255     /// Dumps imports in a use tree recursively.
1256     ///
1257     /// A use tree is an import that may contain nested braces (RFC 2128). The `use_tree` parameter
1258     /// is the current use tree under scrutiny, while `id` and `prefix` are its corresponding node
1259     /// id and path. `root_item` is the topmost use tree in the hierarchy.
1260     ///
1261     /// If `use_tree` is a simple or glob import, it is dumped into the analysis data. Otherwise,
1262     /// each child use tree is dumped recursively.
1263     fn process_use_tree(&mut self,
1264                          use_tree: &'l ast::UseTree,
1265                          id: NodeId,
1266                          root_item: &'l ast::Item,
1267                          prefix: &ast::Path) {
1268         let path = &use_tree.prefix;
1269
1270         // The access is calculated using the current tree ID, but with the root tree's visibility
1271         // (since nested trees don't have their own visibility).
1272         let access = access_from!(self.save_ctxt, root_item.vis, id);
1273
1274         // The parent def id of a given use tree is always the enclosing item.
1275         let parent = self.save_ctxt.tcx.hir.opt_local_def_id(id)
1276             .and_then(|id| self.save_ctxt.tcx.parent_def_id(id))
1277             .map(::id_from_def_id);
1278
1279         match use_tree.kind {
1280             ast::UseTreeKind::Simple(..) => {
1281                 let ident = use_tree.ident();
1282                 let path = ast::Path {
1283                     segments: prefix.segments
1284                         .iter()
1285                         .chain(path.segments.iter())
1286                         .cloned()
1287                         .collect(),
1288                     span: path.span,
1289                 };
1290
1291                 let sub_span = self.span.span_for_last_ident(path.span);
1292                 let alias_span = self.span.sub_span_after_keyword(use_tree.span, keywords::As);
1293                 let ref_id = self.lookup_def_id(id);
1294
1295                 if !self.span.filter_generated(sub_span, path.span) {
1296                     let span = self.span_from_span(sub_span.expect("No span found for use"));
1297                     let alias_span = alias_span.map(|sp| self.span_from_span(sp));
1298                     self.dumper.import(&access, Import {
1299                         kind: ImportKind::Use,
1300                         ref_id: ref_id.map(|id| ::id_from_def_id(id)),
1301                         span,
1302                         alias_span,
1303                         name: ident.to_string(),
1304                         value: String::new(),
1305                         parent,
1306                     });
1307                 }
1308                 self.write_sub_paths_truncated(&path);
1309             }
1310             ast::UseTreeKind::Glob => {
1311                 let path = ast::Path {
1312                     segments: prefix.segments
1313                         .iter()
1314                         .chain(path.segments.iter())
1315                         .cloned()
1316                         .collect(),
1317                     span: path.span,
1318                 };
1319
1320                 // Make a comma-separated list of names of imported modules.
1321                 let glob_map = &self.save_ctxt.analysis.glob_map;
1322                 let glob_map = glob_map.as_ref().unwrap();
1323                 let names = if glob_map.contains_key(&id) {
1324                     glob_map.get(&id).unwrap().iter().map(|n| n.to_string()).collect()
1325                 } else {
1326                     Vec::new()
1327                 };
1328
1329                 let sub_span = self.span.sub_span_of_token(use_tree.span,
1330                                                            token::BinOp(token::Star));
1331                 if !self.span.filter_generated(sub_span, use_tree.span) {
1332                     let span =
1333                         self.span_from_span(sub_span.expect("No span found for use glob"));
1334                     self.dumper.import(&access, Import {
1335                         kind: ImportKind::GlobUse,
1336                         ref_id: None,
1337                         span,
1338                         alias_span: None,
1339                         name: "*".to_owned(),
1340                         value: names.join(", "),
1341                         parent,
1342                     });
1343                 }
1344                 self.write_sub_paths(&path);
1345             }
1346             ast::UseTreeKind::Nested(ref nested_items) => {
1347                 let prefix = ast::Path {
1348                     segments: prefix.segments
1349                         .iter()
1350                         .chain(path.segments.iter())
1351                         .cloned()
1352                         .collect(),
1353                     span: path.span,
1354                 };
1355                 for &(ref tree, id) in nested_items {
1356                     self.process_use_tree(tree, id, root_item, &prefix);
1357                 }
1358             }
1359         }
1360     }
1361 }
1362
1363 impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> Visitor<'l> for DumpVisitor<'l, 'tcx, 'll, O> {
1364     fn visit_mod(&mut self, m: &'l ast::Mod, span: Span, attrs: &[ast::Attribute], id: NodeId) {
1365         // Since we handle explicit modules ourselves in visit_item, this should
1366         // only get called for the root module of a crate.
1367         assert_eq!(id, ast::CRATE_NODE_ID);
1368
1369         let qualname = format!("::{}", self.tcx.node_path_str(id));
1370
1371         let cm = self.tcx.sess.codemap();
1372         let filename = cm.span_to_filename(span);
1373         let data_id = ::id_from_node_id(id, &self.save_ctxt);
1374         let children = m.items
1375             .iter()
1376             .map(|i| ::id_from_node_id(i.id, &self.save_ctxt))
1377             .collect();
1378         let span = self.span_from_span(span);
1379
1380         self.dumper.dump_def(
1381             &Access {
1382                 public: true,
1383                 reachable: true,
1384             },
1385             Def {
1386                 kind: DefKind::Mod,
1387                 id: data_id,
1388                 name: String::new(),
1389                 qualname,
1390                 span,
1391                 value: filename.to_string(),
1392                 children,
1393                 parent: None,
1394                 decl_id: None,
1395                 docs: self.save_ctxt.docs_for_attrs(attrs),
1396                 sig: None,
1397                 attributes: lower_attributes(attrs.to_owned(), &self.save_ctxt),
1398             },
1399         );
1400         self.nest_scope(id, |v| visit::walk_mod(v, m));
1401     }
1402
1403     fn visit_item(&mut self, item: &'l ast::Item) {
1404         use syntax::ast::ItemKind::*;
1405         self.process_macro_use(item.span);
1406         match item.node {
1407             Use(ref use_tree) => {
1408                 let prefix = ast::Path {
1409                     segments: vec![],
1410                     span: DUMMY_SP,
1411                 };
1412                 self.process_use_tree(use_tree, item.id, item, &prefix);
1413             }
1414             ExternCrate(_) => {
1415                 let alias_span = self.span.span_for_last_ident(item.span);
1416
1417                 if !self.span.filter_generated(alias_span, item.span) {
1418                     let span =
1419                         self.span_from_span(alias_span.expect("No span found for extern crate"));
1420                     let parent = self.save_ctxt.tcx.hir.opt_local_def_id(item.id)
1421                         .and_then(|id| self.save_ctxt.tcx.parent_def_id(id))
1422                         .map(::id_from_def_id);
1423                     self.dumper.import(
1424                         &Access {
1425                             public: false,
1426                             reachable: false,
1427                         },
1428                         Import {
1429                             kind: ImportKind::ExternCrate,
1430                             ref_id: None,
1431                             span,
1432                             alias_span: None,
1433                             name: item.ident.to_string(),
1434                             value: String::new(),
1435                             parent,
1436                         },
1437                     );
1438                 }
1439             }
1440             Fn(ref decl, .., ref ty_params, ref body) => {
1441                 self.process_fn(item, &decl, ty_params, &body)
1442             }
1443             Static(ref typ, _, ref expr) => self.process_static_or_const_item(item, typ, expr),
1444             Const(ref typ, ref expr) => self.process_static_or_const_item(item, &typ, &expr),
1445             Struct(ref def, ref ty_params) | Union(ref def, ref ty_params) => {
1446                 self.process_struct(item, def, ty_params)
1447             }
1448             Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1449             Impl(.., ref ty_params, ref trait_ref, ref typ, ref impl_items) => {
1450                 self.process_impl(item, ty_params, trait_ref, &typ, impl_items)
1451             }
1452             Trait(_, _, ref generics, ref trait_refs, ref methods) => {
1453                 self.process_trait(item, generics, trait_refs, methods)
1454             }
1455             Mod(ref m) => {
1456                 self.process_mod(item);
1457                 self.nest_scope(item.id, |v| visit::walk_mod(v, m));
1458             }
1459             Ty(ref ty, ref ty_params) => {
1460                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
1461                 let value = ty_to_string(&ty);
1462                 let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Type);
1463                 if !self.span.filter_generated(sub_span, item.span) {
1464                     let span = self.span_from_span(sub_span.expect("No span found for typedef"));
1465                     let id = ::id_from_node_id(item.id, &self.save_ctxt);
1466
1467                     self.dumper.dump_def(
1468                         &access_from!(self.save_ctxt, item),
1469                         Def {
1470                             kind: DefKind::Type,
1471                             id,
1472                             span,
1473                             name: item.ident.to_string(),
1474                             qualname: qualname.clone(),
1475                             value,
1476                             parent: None,
1477                             children: vec![],
1478                             decl_id: None,
1479                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1480                             sig: sig::item_signature(item, &self.save_ctxt),
1481                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1482                         },
1483                     );
1484                 }
1485
1486                 self.visit_ty(&ty);
1487                 self.process_generic_params(ty_params, item.span, &qualname, item.id);
1488             }
1489             Existential(ref _bounds, ref ty_params) => {
1490                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
1491                 // FIXME do something with _bounds
1492                 let value = String::new();
1493                 let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Type);
1494                 if !self.span.filter_generated(sub_span, item.span) {
1495                     let span = self.span_from_span(sub_span.expect("No span found for typedef"));
1496                     let id = ::id_from_node_id(item.id, &self.save_ctxt);
1497
1498                     self.dumper.dump_def(
1499                         &access_from!(self.save_ctxt, item),
1500                         Def {
1501                             kind: DefKind::Type,
1502                             id,
1503                             span,
1504                             name: item.ident.to_string(),
1505                             qualname: qualname.clone(),
1506                             value,
1507                             parent: None,
1508                             children: vec![],
1509                             decl_id: None,
1510                             docs: self.save_ctxt.docs_for_attrs(&item.attrs),
1511                             sig: sig::item_signature(item, &self.save_ctxt),
1512                             attributes: lower_attributes(item.attrs.clone(), &self.save_ctxt),
1513                         },
1514                     );
1515                 }
1516
1517                 self.process_generic_params(ty_params, item.span, &qualname, item.id);
1518             }
1519             Mac(_) => (),
1520             _ => visit::walk_item(self, item),
1521         }
1522     }
1523
1524     fn visit_generics(&mut self, generics: &'l ast::Generics) {
1525         generics.params.iter().for_each(|param| match param.kind {
1526             ast::GenericParamKind::Lifetime { .. } => {}
1527             ast::GenericParamKind::Type { ref default, .. } => {
1528                 for bound in &param.bounds {
1529                     if let ast::GenericBound::Trait(ref trait_ref, _) = *bound {
1530                         self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
1531                     }
1532                 }
1533                 if let Some(ref ty) = default {
1534                     self.visit_ty(&ty);
1535                 }
1536             }
1537         });
1538     }
1539
1540     fn visit_ty(&mut self, t: &'l ast::Ty) {
1541         self.process_macro_use(t.span);
1542         match t.node {
1543             ast::TyKind::Path(_, ref path) => {
1544                 if generated_code(t.span) {
1545                     return;
1546                 }
1547
1548                 if let Some(id) = self.lookup_def_id(t.id) {
1549                     if let Some(sub_span) = self.span.sub_span_for_type_name(t.span) {
1550                         let span = self.span_from_span(sub_span);
1551                         self.dumper.dump_ref(Ref {
1552                             kind: RefKind::Type,
1553                             span,
1554                             ref_id: ::id_from_def_id(id),
1555                         });
1556                     }
1557                 }
1558
1559                 self.write_sub_paths_truncated(path);
1560                 visit::walk_path(self, path);
1561             }
1562             ast::TyKind::Array(ref element, ref length) => {
1563                 self.visit_ty(element);
1564                 self.nest_tables(length.id, |v| v.visit_expr(&length.value));
1565             }
1566             _ => visit::walk_ty(self, t),
1567         }
1568     }
1569
1570     fn visit_expr(&mut self, ex: &'l ast::Expr) {
1571         debug!("visit_expr {:?}", ex.node);
1572         self.process_macro_use(ex.span);
1573         match ex.node {
1574             ast::ExprKind::Struct(ref path, ref fields, ref base) => {
1575                 let hir_expr = self.save_ctxt.tcx.hir.expect_expr(ex.id);
1576                 let adt = match self.save_ctxt.tables.expr_ty_opt(&hir_expr) {
1577                     Some(ty) if ty.ty_adt_def().is_some() => ty.ty_adt_def().unwrap(),
1578                     _ => {
1579                         visit::walk_expr(self, ex);
1580                         return;
1581                     }
1582                 };
1583                 let def = self.save_ctxt.get_path_def(hir_expr.id);
1584                 self.process_struct_lit(ex, path, fields, adt.variant_of_def(def), base)
1585             }
1586             ast::ExprKind::MethodCall(ref seg, ref args) => self.process_method_call(ex, seg, args),
1587             ast::ExprKind::Field(ref sub_ex, _) => {
1588                 self.visit_expr(&sub_ex);
1589
1590                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1591                     down_cast_data!(field_data, RefData, ex.span);
1592                     if !generated_code(ex.span) {
1593                         self.dumper.dump_ref(field_data);
1594                     }
1595                 }
1596             }
1597             ast::ExprKind::Closure(_, _, _, ref decl, ref body, _fn_decl_span) => {
1598                 let mut id = String::from("$");
1599                 id.push_str(&ex.id.to_string());
1600
1601                 // walk arg and return types
1602                 for arg in &decl.inputs {
1603                     self.visit_ty(&arg.ty);
1604                 }
1605
1606                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1607                     self.visit_ty(&ret_ty);
1608                 }
1609
1610                 // walk the body
1611                 self.nest_tables(ex.id, |v| {
1612                     v.process_formals(&decl.inputs, &id);
1613                     v.nest_scope(ex.id, |v| v.visit_expr(body))
1614                 });
1615             }
1616             ast::ExprKind::ForLoop(ref pattern, ref subexpression, ref block, _) => {
1617                 let value = self.span.snippet(subexpression.span);
1618                 self.process_var_decl(pattern, value);
1619                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1620                 self.visit_expr(subexpression);
1621                 visit::walk_block(self, block);
1622             }
1623             ast::ExprKind::WhileLet(ref pats, ref subexpression, ref block, _) => {
1624                 self.process_var_decl_multi(pats);
1625                 debug!("for loop, walk sub-expr: {:?}", subexpression.node);
1626                 self.visit_expr(subexpression);
1627                 visit::walk_block(self, block);
1628             }
1629             ast::ExprKind::IfLet(ref pats, ref subexpression, ref block, ref opt_else) => {
1630                 self.process_var_decl_multi(pats);
1631                 self.visit_expr(subexpression);
1632                 visit::walk_block(self, block);
1633                 opt_else.as_ref().map(|el| self.visit_expr(el));
1634             }
1635             ast::ExprKind::Repeat(ref element, ref count) => {
1636                 self.visit_expr(element);
1637                 self.nest_tables(count.id, |v| v.visit_expr(&count.value));
1638             }
1639             // In particular, we take this branch for call and path expressions,
1640             // where we'll index the idents involved just by continuing to walk.
1641             _ => visit::walk_expr(self, ex),
1642         }
1643     }
1644
1645     fn visit_mac(&mut self, mac: &'l ast::Mac) {
1646         // These shouldn't exist in the AST at this point, log a span bug.
1647         span_bug!(
1648             mac.span,
1649             "macro invocation should have been expanded out of AST"
1650         );
1651     }
1652
1653     fn visit_pat(&mut self, p: &'l ast::Pat) {
1654         self.process_macro_use(p.span);
1655         self.process_pat(p);
1656     }
1657
1658     fn visit_arm(&mut self, arm: &'l ast::Arm) {
1659         self.process_var_decl_multi(&arm.pats);
1660         walk_list!(self, visit_expr, &arm.guard);
1661         self.visit_expr(&arm.body);
1662     }
1663
1664     fn visit_path(&mut self, p: &'l ast::Path, id: NodeId) {
1665         self.process_path(id, p);
1666     }
1667
1668     fn visit_stmt(&mut self, s: &'l ast::Stmt) {
1669         self.process_macro_use(s.span);
1670         visit::walk_stmt(self, s)
1671     }
1672
1673     fn visit_local(&mut self, l: &'l ast::Local) {
1674         self.process_macro_use(l.span);
1675         let value = l.init
1676             .as_ref()
1677             .map(|i| self.span.snippet(i.span))
1678             .unwrap_or(String::new());
1679         self.process_var_decl(&l.pat, value);
1680
1681         // Just walk the initialiser and type (don't want to walk the pattern again).
1682         walk_list!(self, visit_ty, &l.ty);
1683         walk_list!(self, visit_expr, &l.init);
1684     }
1685
1686     fn visit_foreign_item(&mut self, item: &'l ast::ForeignItem) {
1687         let access = access_from!(self.save_ctxt, item);
1688
1689         match item.node {
1690             ast::ForeignItemKind::Fn(ref decl, ref generics) => {
1691                 if let Some(fn_data) = self.save_ctxt.get_extern_item_data(item) {
1692                     down_cast_data!(fn_data, DefData, item.span);
1693
1694                     self.nest_tables(
1695                         item.id,
1696                         |v| v.process_formals(&decl.inputs, &fn_data.qualname),
1697                     );
1698                     self.process_generic_params(generics, item.span, &fn_data.qualname, item.id);
1699                     self.dumper.dump_def(&access, fn_data);
1700                 }
1701
1702                 for arg in &decl.inputs {
1703                     self.visit_ty(&arg.ty);
1704                 }
1705
1706                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1707                     self.visit_ty(&ret_ty);
1708                 }
1709             }
1710             ast::ForeignItemKind::Static(ref ty, _) => {
1711                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1712                     down_cast_data!(var_data, DefData, item.span);
1713                     self.dumper.dump_def(&access, var_data);
1714                 }
1715
1716                 self.visit_ty(ty);
1717             }
1718             ast::ForeignItemKind::Ty => {
1719                 if let Some(var_data) = self.save_ctxt.get_extern_item_data(item) {
1720                     down_cast_data!(var_data, DefData, item.span);
1721                     self.dumper.dump_def(&access, var_data);
1722                 }
1723             }
1724             ast::ForeignItemKind::Macro(..) => {}
1725         }
1726     }
1727 }