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. The data is
  12 //! primarily designed to be used as input to the DXR tool, specifically its
  13 //! Rust plugin. It could also be used by IDEs or other code browsing, search, or
  14 //! cross-referencing tools.
  15 //!
  16 //! Dumping the analysis is implemented by walking the AST and getting a bunch of
  17 //! info out from all over the place. We use Def IDs to identify objects. The
  18 //! tricky part is getting syntactic (span, source text) and semantic (reference
  19 //! Def IDs) information for parts of expressions which the compiler has discarded.
  20 //! E.g., in a path `foo::bar::baz`, the compiler only keeps a span for the whole
  21 //! path and a reference to `baz`, but we want spans and references for all three
  22 //! idents.
  23 //!
  24 //! SpanUtils is used to manipulate spans. In particular, to extract sub-spans
  25 //! from spans (e.g., the span for `bar` from the above example path).
  26 //! DumpVisitor walks the AST and processes it, and an implementor of Dump
  27 //! is used for recording the output in a format-agnostic way (see CsvDumper
  28 //! for an example).
  29
  30 use rustc::hir::def::Def;
  31 use rustc::hir::def_id::DefId;
  32 use rustc::session::Session;
  33 use rustc::ty::{self, TyCtxt};
  34
  35 use std::collections::HashSet;
  36 use std::hash::*;
  37
  38 use syntax::ast::{self, NodeId, PatKind};
  39 use syntax::codemap::*;
  40 use syntax::parse::token::{self, keywords};
  41 use syntax::visit::{self, Visitor};
  42 use syntax::print::pprust::{path_to_string, ty_to_string};
  43 use syntax::ptr::P;
  44
  45 use rustc::hir::lowering::{lower_expr, LoweringContext};
  46
  47 use super::{escape, generated_code, SaveContext, PathCollector};
  48 use super::data::*;
  49 use super::dump::Dump;
  50 use super::span_utils::SpanUtils;
  51 use super::recorder;
  52
  53 macro_rules! down_cast_data {
  54     ($id:ident, $kind:ident, $sp:expr) => {
  55         let $id = if let super::Data::$kind(data) = $id {
  56             data
  57         } else {
  58             span_bug!($sp, "unexpected data kind: {:?}", $id);
  59         }
  60     };
  61 }
  62
  63 pub struct DumpVisitor<'l, 'tcx: 'l, D: 'l> {
  64     save_ctxt: SaveContext<'l, 'tcx>,
  65     sess: &'l Session,
  66     tcx: &'l TyCtxt<'tcx>,
  67     analysis: &'l ty::CrateAnalysis<'l>,
  68     dumper: &'l mut D,
  69
  70     span: SpanUtils<'l>,
  71
  72     cur_scope: NodeId,
  73
  74     // Set of macro definition (callee) spans, and the set
  75     // of macro use (callsite) spans. We store these to ensure
  76     // we only write one macro def per unique macro definition, and
  77     // one macro use per unique callsite span.
  78     mac_defs: HashSet<Span>,
  79     mac_uses: HashSet<Span>,
  80
  81 }
  82
  83 impl <'l, 'tcx, D> DumpVisitor<'l, 'tcx, D>
  84 where D: Dump
  85 {
  86     pub fn new(tcx: &'l TyCtxt<'tcx>,
  87                lcx: &'l LoweringContext<'l>,
  88                analysis: &'l ty::CrateAnalysis<'l>,
  89                dumper: &'l mut D)
  90                -> DumpVisitor<'l, 'tcx, D> {
  91         let span_utils = SpanUtils::new(&tcx.sess);
  92         DumpVisitor {
  93             sess: &tcx.sess,
  94             tcx: tcx,
  95             save_ctxt: SaveContext::from_span_utils(tcx, lcx, span_utils.clone()),
  96             analysis: analysis,
  97             dumper: dumper,
  98             span: span_utils.clone(),
  99             cur_scope: 0,
 100             mac_defs: HashSet::new(),
 101             mac_uses: HashSet::new(),
 102         }
 103     }
 104
 105     fn nest<F>(&mut self, scope_id: NodeId, f: F)
 106         where F: FnOnce(&mut DumpVisitor<'l, 'tcx, D>)
 107     {
 108         let parent_scope = self.cur_scope;
 109         self.cur_scope = scope_id;
 110         f(self);
 111         self.cur_scope = parent_scope;
 112     }
 113
 114     pub fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
 115         let source_file = self.tcx.sess.local_crate_source_file.as_ref();
 116         let crate_root = source_file.map(|source_file| {
 117             match source_file.file_name() {
 118                 Some(_) => source_file.parent().unwrap().display().to_string(),
 119                 None => source_file.display().to_string(),
 120             }
 121         });
 122
 123         // Info about all the external crates referenced from this crate.
 124         let external_crates = self.save_ctxt.get_external_crates().into_iter().map(|c| {
 125             ExternalCrateData {
 126                 name: c.name,
 127                 num: c.number
 128             }
 129         }).collect();
 130
 131         // The current crate.
 132         let data = CratePreludeData {
 133             crate_name: name.into(),
 134             crate_root: crate_root,
 135             external_crates: external_crates
 136         };
 137
 138         self.dumper.crate_prelude(krate.span, data);
 139     }
 140
 141     // Return all non-empty prefixes of a path.
 142     // For each prefix, we return the span for the last segment in the prefix and
 143     // a str representation of the entire prefix.
 144     fn process_path_prefixes(&self, path: &ast::Path) -> Vec<(Span, String)> {
 145         let spans = self.span.spans_for_path_segments(path);
 146
 147         // Paths to enums seem to not match their spans - the span includes all the
 148         // variants too. But they seem to always be at the end, so I hope we can cope with
 149         // always using the first ones. So, only error out if we don't have enough spans.
 150         // What could go wrong...?
 151         if spans.len() < path.segments.len() {
 152             if generated_code(path.span) {
 153                 return vec!();
 154             }
 155             error!("Mis-calculated spans for path '{}'. Found {} spans, expected {}. Found spans:",
 156                    path_to_string(path),
 157                    spans.len(),
 158                    path.segments.len());
 159             for s in &spans {
 160                 let loc = self.sess.codemap().lookup_char_pos(s.lo);
 161                 error!("    '{}' in {}, line {}",
 162                        self.span.snippet(*s),
 163                        loc.file.name,
 164                        loc.line);
 165             }
 166             return vec!();
 167         }
 168
 169         let mut result: Vec<(Span, String)> = vec!();
 170
 171         let mut segs = vec!();
 172         for (i, (seg, span)) in path.segments.iter().zip(&spans).enumerate() {
 173             segs.push(seg.clone());
 174             let sub_path = ast::Path {
 175                 span: *span, // span for the last segment
 176                 global: path.global,
 177                 segments: segs,
 178             };
 179             let qualname = if i == 0 && path.global {
 180                 format!("::{}", path_to_string(&sub_path))
 181             } else {
 182                 path_to_string(&sub_path)
 183             };
 184             result.push((*span, qualname));
 185             segs = sub_path.segments;
 186         }
 187
 188         result
 189     }
 190
 191     // The global arg allows us to override the global-ness of the path (which
 192     // actually means 'does the path start with `::`', rather than 'is the path
 193     // semantically global). We use the override for `use` imports (etc.) where
 194     // the syntax is non-global, but the semantics are global.
 195     fn write_sub_paths(&mut self, path: &ast::Path, global: bool) {
 196         let sub_paths = self.process_path_prefixes(path);
 197         for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
 198             let qualname = if i == 0 && global && !path.global {
 199                 format!("::{}", qualname)
 200             } else {
 201                 qualname.clone()
 202             };
 203             self.dumper.mod_ref(path.span, ModRefData {
 204                 span: *span,
 205                 qualname: qualname,
 206                 scope: self.cur_scope,
 207                 ref_id: None
 208             }.normalize(&self.tcx));
 209         }
 210     }
 211
 212     // As write_sub_paths, but does not process the last ident in the path (assuming it
 213     // will be processed elsewhere). See note on write_sub_paths about global.
 214     fn write_sub_paths_truncated(&mut self, path: &ast::Path, global: bool) {
 215         let sub_paths = self.process_path_prefixes(path);
 216         let len = sub_paths.len();
 217         if len <= 1 {
 218             return;
 219         }
 220
 221         let sub_paths = &sub_paths[..len-1];
 222         for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
 223             let qualname = if i == 0 && global && !path.global {
 224                 format!("::{}", qualname)
 225             } else {
 226                 qualname.clone()
 227             };
 228             self.dumper.mod_ref(path.span, ModRefData {
 229                 span: *span,
 230                 qualname: qualname,
 231                 scope: self.cur_scope,
 232                 ref_id: None
 233             }.normalize(&self.tcx));
 234         }
 235     }
 236
 237     // As write_sub_paths, but expects a path of the form module_path::trait::method
 238     // Where trait could actually be a struct too.
 239     fn write_sub_path_trait_truncated(&mut self, path: &ast::Path) {
 240         let sub_paths = self.process_path_prefixes(path);
 241         let len = sub_paths.len();
 242         if len <= 1 {
 243             return;
 244         }
 245         let sub_paths = &sub_paths[.. (len-1)];
 246
 247         // write the trait part of the sub-path
 248         let (ref span, ref qualname) = sub_paths[len-2];
 249         self.dumper.type_ref(path.span, TypeRefData {
 250             ref_id: None,
 251             span: *span,
 252             qualname: qualname.to_owned(),
 253             scope: 0
 254         });
 255
 256         // write the other sub-paths
 257         if len <= 2 {
 258             return;
 259         }
 260         let sub_paths = &sub_paths[..len-2];
 261         for &(ref span, ref qualname) in sub_paths {
 262             self.dumper.mod_ref(path.span, ModRefData {
 263                 span: *span,
 264                 qualname: qualname.to_owned(),
 265                 scope: self.cur_scope,
 266                 ref_id: None
 267             }.normalize(&self.tcx));
 268         }
 269     }
 270
 271     // looks up anything, not just a type
 272     fn lookup_type_ref(&self, ref_id: NodeId) -> Option<DefId> {
 273         if !self.tcx.def_map.borrow().contains_key(&ref_id) {
 274             bug!("def_map has no key for {} in lookup_type_ref", ref_id);
 275         }
 276         let def = self.tcx.def_map.borrow().get(&ref_id).unwrap().full_def();
 277         match def {
 278             Def::PrimTy(..) => None,
 279             Def::SelfTy(..) => None,
 280             _ => Some(def.def_id()),
 281         }
 282     }
 283
 284     fn process_def_kind(&mut self,
 285                         ref_id: NodeId,
 286                         span: Span,
 287                         sub_span: Option<Span>,
 288                         def_id: DefId,
 289                         scope: NodeId) {
 290         if self.span.filter_generated(sub_span, span) {
 291             return;
 292         }
 293
 294         let def_map = self.tcx.def_map.borrow();
 295         if !def_map.contains_key(&ref_id) {
 296             span_bug!(span,
 297                       "def_map has no key for {} in lookup_def_kind",
 298                       ref_id);
 299         }
 300         let def = def_map.get(&ref_id).unwrap().full_def();
 301         match def {
 302             Def::Mod(_) |
 303             Def::ForeignMod(_) => {
 304                 self.dumper.mod_ref(span, ModRefData {
 305                     span: sub_span.expect("No span found for mod ref"),
 306                     ref_id: Some(def_id),
 307                     scope: scope,
 308                     qualname: String::new()
 309                 }.normalize(&self.tcx));
 310             }
 311             Def::Struct(..) |
 312             Def::Enum(..) |
 313             Def::TyAlias(..) |
 314             Def::AssociatedTy(..) |
 315             Def::Trait(_) => {
 316                 self.dumper.type_ref(span, TypeRefData {
 317                     span: sub_span.expect("No span found for type ref"),
 318                     ref_id: Some(def_id),
 319                     scope: scope,
 320                     qualname: String::new()
 321                 }.normalize(&self.tcx));
 322             }
 323             Def::Static(_, _) |
 324             Def::Const(_) |
 325             Def::AssociatedConst(..) |
 326             Def::Local(..) |
 327             Def::Variant(..) |
 328             Def::Upvar(..) => {
 329                 self.dumper.variable_ref(span, VariableRefData {
 330                     span: sub_span.expect("No span found for var ref"),
 331                     ref_id: def_id,
 332                     scope: scope,
 333                     name: String::new()
 334                 }.normalize(&self.tcx));
 335             }
 336             Def::Fn(..) => {
 337                 self.dumper.function_ref(span, FunctionRefData {
 338                     span: sub_span.expect("No span found for fn ref"),
 339                     ref_id: def_id,
 340                     scope: scope
 341                 }.normalize(&self.tcx));
 342             }
 343             Def::SelfTy(..) |
 344             Def::Label(_) |
 345             Def::TyParam(..) |
 346             Def::Method(..) |
 347             Def::PrimTy(_) |
 348             Def::Err => {
 349                span_bug!(span,
 350                          "process_def_kind for unexpected item: {:?}",
 351                          def);
 352             }
 353         }
 354     }
 355
 356     fn process_formals(&mut self, formals: &Vec<ast::Arg>, qualname: &str) {
 357         for arg in formals {
 358             self.visit_pat(&arg.pat);
 359             let mut collector = PathCollector::new();
 360             collector.visit_pat(&arg.pat);
 361             let span_utils = self.span.clone();
 362             for &(id, ref p, _, _) in &collector.collected_paths {
 363                 let typ = self.tcx.node_types().get(&id).unwrap().to_string();
 364                 // get the span only for the name of the variable (I hope the path is only ever a
 365                 // variable name, but who knows?)
 366                 let sub_span = span_utils.span_for_last_ident(p.span);
 367                 if !self.span.filter_generated(sub_span, p.span) {
 368                     self.dumper.variable(p.span, VariableData {
 369                         id: id,
 370                         span: sub_span.expect("No span found for variable"),
 371                         name: path_to_string(p),
 372                         qualname: format!("{}::{}", qualname, path_to_string(p)),
 373                         type_value: typ,
 374                         value: String::new(),
 375                         scope: 0
 376                     }.normalize(&self.tcx));
 377                 }
 378             }
 379         }
 380     }
 381
 382     fn process_method(&mut self,
 383                       sig: &ast::MethodSig,
 384                       body: Option<&ast::Block>,
 385                       id: ast::NodeId,
 386                       name: ast::Name,
 387                       span: Span) {
 388         debug!("process_method: {}:{}", id, name);
 389
 390         if let Some(method_data) = self.save_ctxt.get_method_data(id, name, span) {
 391
 392             if body.is_some() {
 393                 if !self.span.filter_generated(Some(method_data.span), span) {
 394                     self.dumper.function(span, method_data.clone().normalize(&self.tcx));
 395                 }
 396                 self.process_formals(&sig.decl.inputs, &method_data.qualname);
 397             } else {
 398                 if !self.span.filter_generated(Some(method_data.span), span) {
 399                     self.dumper.method(span, MethodData {
 400                         id: method_data.id,
 401                         span: method_data.span,
 402                         scope: method_data.scope,
 403                         qualname: method_data.qualname.clone(),
 404                     }.normalize(&self.tcx));
 405                 }
 406             }
 407             self.process_generic_params(&sig.generics, span, &method_data.qualname, id);
 408         }
 409
 410         // walk arg and return types
 411         for arg in &sig.decl.inputs {
 412             self.visit_ty(&arg.ty);
 413         }
 414
 415         if let ast::FunctionRetTy::Ty(ref ret_ty) = sig.decl.output {
 416             self.visit_ty(ret_ty);
 417         }
 418
 419         // walk the fn body
 420         if let Some(body) = body {
 421             self.nest(id, |v| v.visit_block(body));
 422         }
 423     }
 424
 425     fn process_trait_ref(&mut self, trait_ref: &ast::TraitRef) {
 426         let trait_ref_data = self.save_ctxt.get_trait_ref_data(trait_ref, self.cur_scope);
 427         if let Some(trait_ref_data) = trait_ref_data {
 428             if !self.span.filter_generated(Some(trait_ref_data.span), trait_ref.path.span) {
 429                 self.dumper.type_ref(trait_ref.path.span, trait_ref_data.normalize(&self.tcx));
 430             }
 431
 432             visit::walk_path(self, &trait_ref.path);
 433         }
 434     }
 435
 436     fn process_struct_field_def(&mut self, field: &ast::StructField, parent_id: NodeId) {
 437         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 438         if let Some(mut field_data) = field_data {
 439             if !self.span.filter_generated(Some(field_data.span), field.span) {
 440                 field_data.scope = normalize_node_id(&self.tcx, field_data.scope) as u32;
 441                 field_data.value = String::new();
 442                 self.dumper.variable(field.span, field_data.normalize(&self.tcx));
 443             }
 444         }
 445     }
 446
 447     // Dump generic params bindings, then visit_generics
 448     fn process_generic_params(&mut self,
 449                               generics: &ast::Generics,
 450                               full_span: Span,
 451                               prefix: &str,
 452                               id: NodeId) {
 453         // We can't only use visit_generics since we don't have spans for param
 454         // bindings, so we reparse the full_span to get those sub spans.
 455         // However full span is the entire enum/fn/struct block, so we only want
 456         // the first few to match the number of generics we're looking for.
 457         let param_sub_spans = self.span.spans_for_ty_params(full_span,
 458                                                             (generics.ty_params.len() as isize));
 459         for (param, param_ss) in generics.ty_params.iter().zip(param_sub_spans) {
 460             // Append $id to name to make sure each one is unique
 461             let name = format!("{}::{}${}",
 462                                prefix,
 463                                escape(self.span.snippet(param_ss)),
 464                                id);
 465             if !self.span.filter_generated(Some(param_ss), full_span) {
 466                 self.dumper.typedef(full_span, TypedefData {
 467                     span: param_ss,
 468                     id: param.id,
 469                     qualname: name,
 470                     value: String::new()
 471                 }.normalize(&self.tcx));
 472             }
 473         }
 474         self.visit_generics(generics);
 475     }
 476
 477     fn process_fn(&mut self,
 478                   item: &ast::Item,
 479                   decl: &ast::FnDecl,
 480                   ty_params: &ast::Generics,
 481                   body: &ast::Block) {
 482         if let Some(fn_data) = self.save_ctxt.get_item_data(item) {
 483             down_cast_data!(fn_data, FunctionData, item.span);
 484             if !self.span.filter_generated(Some(fn_data.span), item.span) {
 485                 self.dumper.function(item.span, fn_data.clone().normalize(&self.tcx));
 486             }
 487
 488             self.process_formals(&decl.inputs, &fn_data.qualname);
 489             self.process_generic_params(ty_params, item.span, &fn_data.qualname, item.id);
 490         }
 491
 492         for arg in &decl.inputs {
 493             self.visit_ty(&arg.ty);
 494         }
 495
 496         if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
 497             self.visit_ty(&ret_ty);
 498         }
 499
 500         self.nest(item.id, |v| v.visit_block(&body));
 501     }
 502
 503     fn process_static_or_const_item(&mut self, item: &ast::Item, typ: &ast::Ty, expr: &ast::Expr) {
 504         if let Some(var_data) = self.save_ctxt.get_item_data(item) {
 505             down_cast_data!(var_data, VariableData, item.span);
 506             if !self.span.filter_generated(Some(var_data.span), item.span) {
 507                 let mut var_data = var_data;
 508                 var_data.scope = normalize_node_id(&self.tcx, var_data.scope) as u32;
 509                 self.dumper.variable(item.span, var_data.normalize(&self.tcx));
 510             }
 511         }
 512         self.visit_ty(&typ);
 513         self.visit_expr(expr);
 514     }
 515
 516     fn process_const(&mut self,
 517                      id: ast::NodeId,
 518                      name: ast::Name,
 519                      span: Span,
 520                      typ: &ast::Ty,
 521                      expr: &ast::Expr) {
 522         let qualname = format!("::{}", self.tcx.node_path_str(id));
 523
 524         let sub_span = self.span.sub_span_after_keyword(span, keywords::Const);
 525
 526         if !self.span.filter_generated(sub_span, span) {
 527             self.dumper.variable(span, VariableData {
 528                 span: sub_span.expect("No span found for variable"),
 529                 id: id,
 530                 name: name.to_string(),
 531                 qualname: qualname,
 532                 value: self.span.snippet(expr.span),
 533                 type_value: ty_to_string(&typ),
 534                 scope: normalize_node_id(&self.tcx, self.cur_scope) as u32
 535             }.normalize(&self.tcx));
 536         }
 537
 538         // walk type and init value
 539         self.visit_ty(typ);
 540         self.visit_expr(expr);
 541     }
 542
 543     fn process_struct(&mut self,
 544                       item: &ast::Item,
 545                       def: &ast::VariantData,
 546                       ty_params: &ast::Generics) {
 547         let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 548
 549         let val = self.span.snippet(item.span);
 550         let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Struct);
 551         if !self.span.filter_generated(sub_span, item.span) {
 552             self.dumper.struct_data(item.span, StructData {
 553                 span: sub_span.expect("No span found for struct"),
 554                 id: item.id,
 555                 ctor_id: def.id(),
 556                 qualname: qualname.clone(),
 557                 scope: self.cur_scope,
 558                 value: val
 559             }.normalize(&self.tcx));
 560         }
 561
 562
 563         // fields
 564         for field in def.fields() {
 565             self.process_struct_field_def(field, item.id);
 566             self.visit_ty(&field.ty);
 567         }
 568
 569         self.process_generic_params(ty_params, item.span, &qualname, item.id);
 570     }
 571
 572     fn process_enum(&mut self,
 573                     item: &ast::Item,
 574                     enum_definition: &ast::EnumDef,
 575                     ty_params: &ast::Generics) {
 576         let enum_data = self.save_ctxt.get_item_data(item);
 577         let enum_data = match enum_data {
 578             None => return,
 579             Some(data) => data,
 580         };
 581         down_cast_data!(enum_data, EnumData, item.span);
 582         let normalized = enum_data.clone().normalize(&self.tcx);
 583         if !self.span.filter_generated(Some(normalized.span), item.span) {
 584             self.dumper.enum_data(item.span, normalized);
 585         }
 586
 587         for variant in &enum_definition.variants {
 588             let name = &variant.node.name.name.as_str();
 589             let mut qualname = enum_data.qualname.clone();
 590             qualname.push_str("::");
 591             qualname.push_str(name);
 592             let val = self.span.snippet(variant.span);
 593
 594             match variant.node.data {
 595                 ast::VariantData::Struct(..) => {
 596                     let sub_span = self.span.span_for_first_ident(variant.span);
 597                     if !self.span.filter_generated(sub_span, variant.span) {
 598                         self.dumper.struct_variant(variant.span, StructVariantData {
 599                             span: sub_span.expect("No span found for struct variant"),
 600                             id: variant.node.data.id(),
 601                             qualname: qualname,
 602                             type_value: enum_data.qualname.clone(),
 603                             value: val,
 604                             scope: enum_data.scope
 605                         }.normalize(&self.tcx));
 606                     }
 607                 }
 608                 _ => {
 609                     let sub_span = self.span.span_for_first_ident(variant.span);
 610                     if !self.span.filter_generated(sub_span, variant.span) {
 611                         self.dumper.tuple_variant(variant.span, TupleVariantData {
 612                             span: sub_span.expect("No span found for tuple variant"),
 613                             id: variant.node.data.id(),
 614                             name: name.to_string(),
 615                             qualname: qualname,
 616                             type_value: enum_data.qualname.clone(),
 617                             value: val,
 618                             scope: enum_data.scope
 619                         }.normalize(&self.tcx));
 620                     }
 621                 }
 622             }
 623
 624
 625             for field in variant.node.data.fields() {
 626                 self.process_struct_field_def(field, variant.node.data.id());
 627                 self.visit_ty(&field.ty);
 628             }
 629         }
 630         self.process_generic_params(ty_params, item.span, &enum_data.qualname, enum_data.id);
 631     }
 632
 633     fn process_impl(&mut self,
 634                     item: &ast::Item,
 635                     type_parameters: &ast::Generics,
 636                     trait_ref: &Option<ast::TraitRef>,
 637                     typ: &ast::Ty,
 638                     impl_items: &[ast::ImplItem]) {
 639         let mut has_self_ref = false;
 640         if let Some(impl_data) = self.save_ctxt.get_item_data(item) {
 641             down_cast_data!(impl_data, ImplData, item.span);
 642             if let Some(ref self_ref) = impl_data.self_ref {
 643                 has_self_ref = true;
 644                 if !self.span.filter_generated(Some(self_ref.span), item.span) {
 645                     self.dumper.type_ref(item.span, self_ref.clone().normalize(&self.tcx));
 646                 }
 647             }
 648             if let Some(ref trait_ref_data) = impl_data.trait_ref {
 649                 if !self.span.filter_generated(Some(trait_ref_data.span), item.span) {
 650                     self.dumper.type_ref(item.span, trait_ref_data.clone().normalize(&self.tcx));
 651                 }
 652
 653                 visit::walk_path(self, &trait_ref.as_ref().unwrap().path);
 654             }
 655
 656             if !self.span.filter_generated(Some(impl_data.span), item.span) {
 657                 self.dumper.impl_data(item.span, ImplData {
 658                     id: impl_data.id,
 659                     span: impl_data.span,
 660                     scope: impl_data.scope,
 661                     trait_ref: impl_data.trait_ref.map(|d| d.ref_id.unwrap()),
 662                     self_ref: impl_data.self_ref.map(|d| d.ref_id.unwrap())
 663                 }.normalize(&self.tcx));
 664             }
 665         }
 666         if !has_self_ref {
 667             self.visit_ty(&typ);
 668         }
 669         self.process_generic_params(type_parameters, item.span, "", item.id);
 670         for impl_item in impl_items {
 671             self.visit_impl_item(impl_item);
 672         }
 673     }
 674
 675     fn process_trait(&mut self,
 676                      item: &ast::Item,
 677                      generics: &ast::Generics,
 678                      trait_refs: &ast::TyParamBounds,
 679                      methods: &[ast::TraitItem]) {
 680         let qualname = format!("::{}", self.tcx.node_path_str(item.id));
 681         let val = self.span.snippet(item.span);
 682         let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Trait);
 683         if !self.span.filter_generated(sub_span, item.span) {
 684             self.dumper.trait_data(item.span, TraitData {
 685                 span: sub_span.expect("No span found for trait"),
 686                 id: item.id,
 687                 qualname: qualname.clone(),
 688                 scope: self.cur_scope,
 689                 value: val
 690             }.normalize(&self.tcx));
 691         }
 692
 693         // super-traits
 694         for super_bound in trait_refs.iter() {
 695             let trait_ref = match *super_bound {
 696                 ast::TraitTyParamBound(ref trait_ref, _) => {
 697                     trait_ref
 698                 }
 699                 ast::RegionTyParamBound(..) => {
 700                     continue;
 701                 }
 702             };
 703
 704             let trait_ref = &trait_ref.trait_ref;
 705             if let Some(id) = self.lookup_type_ref(trait_ref.ref_id) {
 706                 let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
 707                 if !self.span.filter_generated(sub_span, trait_ref.path.span) {
 708                     self.dumper.type_ref(trait_ref.path.span, TypeRefData {
 709                         span: sub_span.expect("No span found for trait ref"),
 710                         ref_id: Some(id),
 711                         scope: self.cur_scope,
 712                         qualname: String::new()
 713                     }.normalize(&self.tcx));
 714                 }
 715
 716                 if !self.span.filter_generated(sub_span, trait_ref.path.span) {
 717                     let sub_span = sub_span.expect("No span for inheritance");
 718                     self.dumper.inheritance(InheritanceData {
 719                         span: sub_span,
 720                         base_id: id,
 721                         deriv_id: item.id
 722                     }.normalize(&self.tcx));
 723                 }
 724             }
 725         }
 726
 727         // walk generics and methods
 728         self.process_generic_params(generics, item.span, &qualname, item.id);
 729         for method in methods {
 730             self.visit_trait_item(method)
 731         }
 732     }
 733
 734     // `item` is the module in question, represented as an item.
 735     fn process_mod(&mut self, item: &ast::Item) {
 736         if let Some(mod_data) = self.save_ctxt.get_item_data(item) {
 737             down_cast_data!(mod_data, ModData, item.span);
 738             if !self.span.filter_generated(Some(mod_data.span), item.span) {
 739                 self.dumper.mod_data(mod_data.normalize(&self.tcx));
 740             }
 741         }
 742     }
 743
 744     fn process_path(&mut self, id: NodeId, path: &ast::Path, ref_kind: Option<recorder::Row>) {
 745         let path_data = self.save_ctxt.get_path_data(id, path);
 746         if generated_code(path.span) && path_data.is_none() {
 747             return;
 748         }
 749
 750         let path_data = match path_data {
 751             Some(pd) => pd,
 752             None => {
 753                 span_bug!(path.span,
 754                           "Unexpected def kind while looking up path in `{}`",
 755                           self.span.snippet(path.span))
 756             }
 757         };
 758
 759         match path_data {
 760             Data::VariableRefData(vrd) => {
 761                 // FIXME: this whole block duplicates the code in process_def_kind
 762                 if !self.span.filter_generated(Some(vrd.span), path.span) {
 763                     match ref_kind {
 764                         Some(recorder::TypeRef) => {
 765                             self.dumper.type_ref(path.span, TypeRefData {
 766                                 span: vrd.span,
 767                                 ref_id: Some(vrd.ref_id),
 768                                 scope: vrd.scope,
 769                                 qualname: String::new()
 770                             }.normalize(&self.tcx));
 771                         }
 772                         Some(recorder::FnRef) => {
 773                             self.dumper.function_ref(path.span, FunctionRefData {
 774                                 span: vrd.span,
 775                                 ref_id: vrd.ref_id,
 776                                 scope: vrd.scope
 777                             }.normalize(&self.tcx));
 778                         }
 779                         Some(recorder::ModRef) => {
 780                             self.dumper.mod_ref(path.span, ModRefData {
 781                                 span: vrd.span,
 782                                 ref_id: Some(vrd.ref_id),
 783                                 scope: vrd.scope,
 784                                 qualname: String::new()
 785                             }.normalize(&self.tcx));
 786                         }
 787                         Some(recorder::VarRef) | None
 788                             => self.dumper.variable_ref(path.span, vrd.normalize(&self.tcx))
 789                     }
 790                 }
 791
 792             }
 793             Data::TypeRefData(trd) => {
 794                 if !self.span.filter_generated(Some(trd.span), path.span) {
 795                     self.dumper.type_ref(path.span, trd.normalize(&self.tcx));
 796                 }
 797             }
 798             Data::MethodCallData(mcd) => {
 799                 if !self.span.filter_generated(Some(mcd.span), path.span) {
 800                     self.dumper.method_call(path.span, mcd.normalize(&self.tcx));
 801                 }
 802             }
 803             Data::FunctionCallData(fcd) => {
 804                 if !self.span.filter_generated(Some(fcd.span), path.span) {
 805                     self.dumper.function_call(path.span, fcd.normalize(&self.tcx));
 806                 }
 807             }
 808             _ => {
 809                span_bug!(path.span, "Unexpected data: {:?}", path_data);
 810             }
 811         }
 812
 813         // Modules or types in the path prefix.
 814         let def_map = self.tcx.def_map.borrow();
 815         let def = def_map.get(&id).unwrap().full_def();
 816         match def {
 817             Def::Method(did) => {
 818                 let ti = self.tcx.impl_or_trait_item(did);
 819                 if let ty::MethodTraitItem(m) = ti {
 820                     if m.explicit_self == ty::ExplicitSelfCategory::Static {
 821                         self.write_sub_path_trait_truncated(path);
 822                     }
 823                 }
 824             }
 825             Def::Local(..) |
 826             Def::Static(_,_) |
 827             Def::Const(..) |
 828             Def::AssociatedConst(..) |
 829             Def::Struct(..) |
 830             Def::Variant(..) |
 831             Def::Fn(..) => self.write_sub_paths_truncated(path, false),
 832             _ => {}
 833         }
 834     }
 835
 836     fn process_struct_lit(&mut self,
 837                           ex: &ast::Expr,
 838                           path: &ast::Path,
 839                           fields: &Vec<ast::Field>,
 840                           variant: ty::VariantDef,
 841                           base: &Option<P<ast::Expr>>) {
 842         self.write_sub_paths_truncated(path, false);
 843
 844         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 845             down_cast_data!(struct_lit_data, TypeRefData, ex.span);
 846             if !self.span.filter_generated(Some(struct_lit_data.span), ex.span) {
 847                 self.dumper.type_ref(ex.span, struct_lit_data.normalize(&self.tcx));
 848             }
 849
 850             let scope = self.save_ctxt.enclosing_scope(ex.id);
 851
 852             for field in fields {
 853                 if let Some(field_data) = self.save_ctxt
 854                                               .get_field_ref_data(field, variant, scope) {
 855
 856                     if !self.span.filter_generated(Some(field_data.span), field.ident.span) {
 857                         self.dumper.variable_ref(field.ident.span, field_data.normalize(&self.tcx));
 858                     }
 859                 }
 860
 861                 self.visit_expr(&field.expr)
 862             }
 863         }
 864
 865         walk_list!(self, visit_expr, base);
 866     }
 867
 868     fn process_method_call(&mut self, ex: &ast::Expr, args: &Vec<P<ast::Expr>>) {
 869         if let Some(mcd) = self.save_ctxt.get_expr_data(ex) {
 870             down_cast_data!(mcd, MethodCallData, ex.span);
 871             if !self.span.filter_generated(Some(mcd.span), ex.span) {
 872                 self.dumper.method_call(ex.span, mcd.normalize(&self.tcx));
 873             }
 874         }
 875
 876         // walk receiver and args
 877         walk_list!(self, visit_expr, args);
 878     }
 879
 880     fn process_pat(&mut self, p: &ast::Pat) {
 881         match p.node {
 882             PatKind::Struct(ref path, ref fields, _) => {
 883                 visit::walk_path(self, path);
 884                 let adt = self.tcx.node_id_to_type(p.id).ty_adt_def().unwrap();
 885                 let def = self.tcx.def_map.borrow()[&p.id].full_def();
 886                 let variant = adt.variant_of_def(def);
 887
 888                 for &Spanned { node: ref field, span } in fields {
 889                     let sub_span = self.span.span_for_first_ident(span);
 890                     if let Some(f) = variant.find_field_named(field.ident.name) {
 891                         if !self.span.filter_generated(sub_span, span) {
 892                             self.dumper.variable_ref(span, VariableRefData {
 893                                 span: sub_span.expect("No span fund for var ref"),
 894                                 ref_id: f.did,
 895                                 scope: self.cur_scope,
 896                                 name: String::new()
 897                             }.normalize(&self.tcx));
 898                         }
 899                     }
 900                     self.visit_pat(&field.pat);
 901                 }
 902             }
 903             _ => visit::walk_pat(self, p),
 904         }
 905     }
 906
 907
 908     fn process_var_decl(&mut self, p: &ast::Pat, value: String) {
 909         // The local could declare multiple new vars, we must walk the
 910         // pattern and collect them all.
 911         let mut collector = PathCollector::new();
 912         collector.visit_pat(&p);
 913         self.visit_pat(&p);
 914
 915         for &(id, ref p, immut, _) in &collector.collected_paths {
 916             let value = if immut == ast::Mutability::Immutable {
 917                 value.to_string()
 918             } else {
 919                 "<mutable>".to_string()
 920             };
 921             let types = self.tcx.node_types();
 922             let typ = types.get(&id).map(|t| t.to_string()).unwrap_or(String::new());
 923             // Get the span only for the name of the variable (I hope the path
 924             // is only ever a variable name, but who knows?).
 925             let sub_span = self.span.span_for_last_ident(p.span);
 926             // Rust uses the id of the pattern for var lookups, so we'll use it too.
 927             if !self.span.filter_generated(sub_span, p.span) {
 928                 self.dumper.variable(p.span, VariableData {
 929                     span: sub_span.expect("No span found for variable"),
 930                     id: id,
 931                     name: path_to_string(p),
 932                     qualname: format!("{}${}", path_to_string(p), id),
 933                     value: value,
 934                     type_value: typ,
 935                     scope: 0
 936                 }.normalize(&self.tcx));
 937             }
 938         }
 939     }
 940
 941     /// Extract macro use and definition information from the AST node defined
 942     /// by the given NodeId, using the expansion information from the node's
 943     /// span.
 944     ///
 945     /// If the span is not macro-generated, do nothing, else use callee and
 946     /// callsite spans to record macro definition and use data, using the
 947     /// mac_uses and mac_defs sets to prevent multiples.
 948     fn process_macro_use(&mut self, span: Span, id: NodeId) {
 949         let data = match self.save_ctxt.get_macro_use_data(span, id) {
 950             None => return,
 951             Some(data) => data,
 952         };
 953         let mut hasher = SipHasher::new();
 954         data.callee_span.hash(&mut hasher);
 955         let hash = hasher.finish();
 956         let qualname = format!("{}::{}", data.name, hash);
 957         // Don't write macro definition for imported macros
 958         if !self.mac_defs.contains(&data.callee_span)
 959             && !data.imported {
 960             self.mac_defs.insert(data.callee_span);
 961             if let Some(sub_span) = self.span.span_for_macro_def_name(data.callee_span) {
 962                 self.dumper.macro_data(data.callee_span, MacroData {
 963                     span: sub_span,
 964                     name: data.name.clone(),
 965                     qualname: qualname.clone()
 966                 });
 967             }
 968         }
 969         if !self.mac_uses.contains(&data.span) {
 970             self.mac_uses.insert(data.span);
 971             if let Some(sub_span) = self.span.span_for_macro_use_name(data.span) {
 972                 self.dumper.macro_use(data.span, MacroUseData {
 973                     span: sub_span,
 974                     name: data.name,
 975                     qualname: qualname,
 976                     scope: data.scope,
 977                     callee_span: data.callee_span,
 978                     imported: data.imported
 979                 }.normalize(&self.tcx));
 980             }
 981         }
 982     }
 983 }
 984
 985 impl<'l, 'tcx, 'v, D: Dump + 'l> Visitor<'v> for DumpVisitor<'l, 'tcx, D> {
 986     fn visit_item(&mut self, item: &ast::Item) {
 987         use syntax::ast::ItemKind::*;
 988         self.process_macro_use(item.span, item.id);
 989         match item.node {
 990             Use(ref use_item) => {
 991                 match use_item.node {
 992                     ast::ViewPathSimple(ident, ref path) => {
 993                         let sub_span = self.span.span_for_last_ident(path.span);
 994                         let mod_id = match self.lookup_type_ref(item.id) {
 995                             Some(def_id) => {
 996                                 let scope = self.cur_scope;
 997                                 self.process_def_kind(item.id, path.span, sub_span, def_id, scope);
 998
 999                                 Some(def_id)
1000                             }
1001                             None => None,
1002                         };
1003
1004                         // 'use' always introduces an alias, if there is not an explicit
1005                         // one, there is an implicit one.
1006                         let sub_span = match self.span.sub_span_after_keyword(use_item.span,
1007                                                                               keywords::As) {
1008                             Some(sub_span) => Some(sub_span),
1009                             None => sub_span,
1010                         };
1011
1012                         if !self.span.filter_generated(sub_span, path.span) {
1013                             self.dumper.use_data(path.span, UseData {
1014                                 span: sub_span.expect("No span found for use"),
1015                                 id: item.id,
1016                                 mod_id: mod_id,
1017                                 name: ident.name.to_string(),
1018                                 scope: self.cur_scope
1019                             }.normalize(&self.tcx));
1020                         }
1021                         self.write_sub_paths_truncated(path, true);
1022                     }
1023                     ast::ViewPathGlob(ref path) => {
1024                         // Make a comma-separated list of names of imported modules.
1025                         let mut names = vec![];
1026                         let glob_map = &self.analysis.glob_map;
1027                         let glob_map = glob_map.as_ref().unwrap();
1028                         if glob_map.contains_key(&item.id) {
1029                             for n in glob_map.get(&item.id).unwrap() {
1030                                 names.push(n.to_string());
1031                             }
1032                         }
1033
1034                         let sub_span = self.span
1035                                            .sub_span_of_token(path.span, token::BinOp(token::Star));
1036                         if !self.span.filter_generated(sub_span, path.span) {
1037                             self.dumper.use_glob(path.span, UseGlobData {
1038                                 span: sub_span.expect("No span found for use glob"),
1039                                 id: item.id,
1040                                 names: names,
1041                                 scope: self.cur_scope
1042                             }.normalize(&self.tcx));
1043                         }
1044                         self.write_sub_paths(path, true);
1045                     }
1046                     ast::ViewPathList(ref path, ref list) => {
1047                         for plid in list {
1048                             match plid.node {
1049                                 ast::PathListItemKind::Ident { id, .. } => {
1050                                     let scope = self.cur_scope;
1051                                     if let Some(def_id) = self.lookup_type_ref(id) {
1052                                         self.process_def_kind(id,
1053                                                               plid.span,
1054                                                               Some(plid.span),
1055                                                               def_id,
1056                                                               scope);
1057                                     }
1058                                 }
1059                                 ast::PathListItemKind::Mod { .. } => (),
1060                             }
1061                         }
1062
1063                         self.write_sub_paths(path, true);
1064                     }
1065                 }
1066             }
1067             ExternCrate(ref s) => {
1068                 let location = match *s {
1069                     Some(s) => s.to_string(),
1070                     None => item.ident.to_string(),
1071                 };
1072                 let alias_span = self.span.span_for_last_ident(item.span);
1073                 let cnum = match self.sess.cstore.extern_mod_stmt_cnum(item.id) {
1074                     Some(cnum) => cnum,
1075                     None => 0,
1076                 };
1077
1078                 if !self.span.filter_generated(alias_span, item.span) {
1079                     self.dumper.extern_crate(item.span, ExternCrateData {
1080                         id: item.id,
1081                         name: item.ident.name.to_string(),
1082                         crate_num: cnum,
1083                         location: location,
1084                         span: alias_span.expect("No span found for extern crate"),
1085                         scope: self.cur_scope,
1086                     }.normalize(&self.tcx));
1087                 }
1088             }
1089             Fn(ref decl, _, _, _, ref ty_params, ref body) =>
1090                 self.process_fn(item, &decl, ty_params, &body),
1091             Static(ref typ, _, ref expr) =>
1092                 self.process_static_or_const_item(item, typ, expr),
1093             Const(ref typ, ref expr) =>
1094                 self.process_static_or_const_item(item, &typ, &expr),
1095             Struct(ref def, ref ty_params) => self.process_struct(item, def, ty_params),
1096             Enum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1097             Impl(_, _,
1098                           ref ty_params,
1099                           ref trait_ref,
1100                           ref typ,
1101                           ref impl_items) => {
1102                 self.process_impl(item, ty_params, trait_ref, &typ, impl_items)
1103             }
1104             Trait(_, ref generics, ref trait_refs, ref methods) =>
1105                 self.process_trait(item, generics, trait_refs, methods),
1106             Mod(ref m) => {
1107                 self.process_mod(item);
1108                 self.nest(item.id, |v| visit::walk_mod(v, m));
1109             }
1110             Ty(ref ty, ref ty_params) => {
1111                 let qualname = format!("::{}", self.tcx.node_path_str(item.id));
1112                 let value = ty_to_string(&ty);
1113                 let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Type);
1114                 if !self.span.filter_generated(sub_span, item.span) {
1115                     self.dumper.typedef(item.span, TypedefData {
1116                         span: sub_span.expect("No span found for typedef"),
1117                         id: item.id,
1118                         qualname: qualname.clone(),
1119                         value: value
1120                     }.normalize(&self.tcx));
1121                 }
1122
1123                 self.visit_ty(&ty);
1124                 self.process_generic_params(ty_params, item.span, &qualname, item.id);
1125             }
1126             Mac(_) => (),
1127             _ => visit::walk_item(self, item),
1128         }
1129     }
1130
1131     fn visit_generics(&mut self, generics: &ast::Generics) {
1132         for param in generics.ty_params.iter() {
1133             for bound in param.bounds.iter() {
1134                 if let ast::TraitTyParamBound(ref trait_ref, _) = *bound {
1135                     self.process_trait_ref(&trait_ref.trait_ref);
1136                 }
1137             }
1138             if let Some(ref ty) = param.default {
1139                 self.visit_ty(&ty);
1140             }
1141         }
1142     }
1143
1144     fn visit_trait_item(&mut self, trait_item: &ast::TraitItem) {
1145         self.process_macro_use(trait_item.span, trait_item.id);
1146         match trait_item.node {
1147             ast::TraitItemKind::Const(ref ty, Some(ref expr)) => {
1148                 self.process_const(trait_item.id,
1149                                    trait_item.ident.name,
1150                                    trait_item.span,
1151                                    &ty,
1152                                    &expr);
1153             }
1154             ast::TraitItemKind::Method(ref sig, ref body) => {
1155                 self.process_method(sig,
1156                                     body.as_ref().map(|x| &**x),
1157                                     trait_item.id,
1158                                     trait_item.ident.name,
1159                                     trait_item.span);
1160             }
1161             ast::TraitItemKind::Const(_, None) |
1162             ast::TraitItemKind::Type(..) => {}
1163         }
1164     }
1165
1166     fn visit_impl_item(&mut self, impl_item: &ast::ImplItem) {
1167         self.process_macro_use(impl_item.span, impl_item.id);
1168         match impl_item.node {
1169             ast::ImplItemKind::Const(ref ty, ref expr) => {
1170                 self.process_const(impl_item.id,
1171                                    impl_item.ident.name,
1172                                    impl_item.span,
1173                                    &ty,
1174                                    &expr);
1175             }
1176             ast::ImplItemKind::Method(ref sig, ref body) => {
1177                 self.process_method(sig,
1178                                     Some(body),
1179                                     impl_item.id,
1180                                     impl_item.ident.name,
1181                                     impl_item.span);
1182             }
1183             ast::ImplItemKind::Type(_) |
1184             ast::ImplItemKind::Macro(_) => {}
1185         }
1186     }
1187
1188     fn visit_ty(&mut self, t: &ast::Ty) {
1189         self.process_macro_use(t.span, t.id);
1190         match t.node {
1191             ast::TyKind::Path(_, ref path) => {
1192                 if let Some(id) = self.lookup_type_ref(t.id) {
1193                     let sub_span = self.span.sub_span_for_type_name(t.span);
1194                     if !self.span.filter_generated(sub_span, t.span) {
1195                         self.dumper.type_ref(t.span, TypeRefData {
1196                             span: sub_span.expect("No span found for type ref"),
1197                             ref_id: Some(id),
1198                             scope: self.cur_scope,
1199                             qualname: String::new()
1200                         }.normalize(&self.tcx));
1201                     }
1202                 }
1203
1204                 self.write_sub_paths_truncated(path, false);
1205
1206                 visit::walk_path(self, path);
1207             }
1208             _ => visit::walk_ty(self, t),
1209         }
1210     }
1211
1212     fn visit_expr(&mut self, ex: &ast::Expr) {
1213         self.process_macro_use(ex.span, ex.id);
1214         match ex.node {
1215             ast::ExprKind::Call(ref _f, ref _args) => {
1216                 // Don't need to do anything for function calls,
1217                 // because just walking the callee path does what we want.
1218                 visit::walk_expr(self, ex);
1219             }
1220             ast::ExprKind::Path(_, ref path) => {
1221                 self.process_path(ex.id, path, None);
1222                 visit::walk_expr(self, ex);
1223             }
1224             ast::ExprKind::Struct(ref path, ref fields, ref base) => {
1225                 let hir_expr = lower_expr(self.save_ctxt.lcx, ex);
1226                 let adt = self.tcx.expr_ty(&hir_expr).ty_adt_def().unwrap();
1227                 let def = self.tcx.resolve_expr(&hir_expr);
1228                 self.process_struct_lit(ex, path, fields, adt.variant_of_def(def), base)
1229             }
1230             ast::ExprKind::MethodCall(_, _, ref args) => self.process_method_call(ex, args),
1231             ast::ExprKind::Field(ref sub_ex, _) => {
1232                 self.visit_expr(&sub_ex);
1233
1234                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1235                     down_cast_data!(field_data, VariableRefData, ex.span);
1236                     if !self.span.filter_generated(Some(field_data.span), ex.span) {
1237                         self.dumper.variable_ref(ex.span, field_data.normalize(&self.tcx));
1238                     }
1239                 }
1240             }
1241             ast::ExprKind::TupField(ref sub_ex, idx) => {
1242                 self.visit_expr(&sub_ex);
1243
1244                 let hir_node = lower_expr(self.save_ctxt.lcx, sub_ex);
1245                 let ty = &self.tcx.expr_ty_adjusted(&hir_node).sty;
1246                 match *ty {
1247                     ty::TyStruct(def, _) => {
1248                         let sub_span = self.span.sub_span_after_token(ex.span, token::Dot);
1249                         if !self.span.filter_generated(sub_span, ex.span) {
1250                             self.dumper.variable_ref(ex.span, VariableRefData {
1251                                 span: sub_span.expect("No span found for var ref"),
1252                                 ref_id: def.struct_variant().fields[idx.node].did,
1253                                 scope: self.cur_scope,
1254                                 name: String::new()
1255                             }.normalize(&self.tcx));
1256                         }
1257                     }
1258                     ty::TyTuple(_) => {}
1259                     _ => span_bug!(ex.span,
1260                                    "Expected struct or tuple type, found {:?}",
1261                                    ty),
1262                 }
1263             }
1264             ast::ExprKind::Closure(_, ref decl, ref body) => {
1265                 let mut id = String::from("$");
1266                 id.push_str(&ex.id.to_string());
1267                 self.process_formals(&decl.inputs, &id);
1268
1269                 // walk arg and return types
1270                 for arg in &decl.inputs {
1271                     self.visit_ty(&arg.ty);
1272                 }
1273
1274                 if let ast::FunctionRetTy::Ty(ref ret_ty) = decl.output {
1275                     self.visit_ty(&ret_ty);
1276                 }
1277
1278                 // walk the body
1279                 self.nest(ex.id, |v| v.visit_block(&body));
1280             }
1281             ast::ExprKind::ForLoop(ref pattern, ref subexpression, ref block, _) |
1282             ast::ExprKind::WhileLet(ref pattern, ref subexpression, ref block, _) => {
1283                 let value = self.span.snippet(mk_sp(ex.span.lo, subexpression.span.hi));
1284                 self.process_var_decl(pattern, value);
1285                 visit::walk_expr(self, subexpression);
1286                 visit::walk_block(self, block);
1287             }
1288             ast::ExprKind::IfLet(ref pattern, ref subexpression, ref block, ref opt_else) => {
1289                 let value = self.span.snippet(mk_sp(ex.span.lo, subexpression.span.hi));
1290                 self.process_var_decl(pattern, value);
1291                 visit::walk_expr(self, subexpression);
1292                 visit::walk_block(self, block);
1293                 opt_else.as_ref().map(|el| visit::walk_expr(self, el));
1294             }
1295             _ => {
1296                 visit::walk_expr(self, ex)
1297             }
1298         }
1299     }
1300
1301     fn visit_mac(&mut self, mac: &ast::Mac) {
1302         // These shouldn't exist in the AST at this point, log a span bug.
1303         span_bug!(mac.span, "macro invocation should have been expanded out of AST");
1304     }
1305
1306     fn visit_pat(&mut self, p: &ast::Pat) {
1307         self.process_macro_use(p.span, p.id);
1308         self.process_pat(p);
1309     }
1310
1311     fn visit_arm(&mut self, arm: &ast::Arm) {
1312         let mut collector = PathCollector::new();
1313         for pattern in &arm.pats {
1314             // collect paths from the arm's patterns
1315             collector.visit_pat(&pattern);
1316             self.visit_pat(&pattern);
1317         }
1318
1319         // This is to get around borrow checking, because we need mut self to call process_path.
1320         let mut paths_to_process = vec![];
1321
1322         // process collected paths
1323         for &(id, ref p, immut, ref_kind) in &collector.collected_paths {
1324             let def_map = self.tcx.def_map.borrow();
1325             if !def_map.contains_key(&id) {
1326                 span_bug!(p.span, "def_map has no key for {} in visit_arm", id);
1327             }
1328             let def = def_map.get(&id).unwrap().full_def();
1329             match def {
1330                 Def::Local(_, id) => {
1331                     let value = if immut == ast::Mutability::Immutable {
1332                         self.span.snippet(p.span).to_string()
1333                     } else {
1334                         "<mutable>".to_string()
1335                     };
1336
1337                     assert!(p.segments.len() == 1,
1338                             "qualified path for local variable def in arm");
1339                     if !self.span.filter_generated(Some(p.span), p.span) {
1340                         self.dumper.variable(p.span, VariableData {
1341                             span: p.span,
1342                             id: id,
1343                             name: path_to_string(p),
1344                             qualname: format!("{}${}", path_to_string(p), id),
1345                             value: value,
1346                             type_value: String::new(),
1347                             scope: 0
1348                         }.normalize(&self.tcx));
1349                     }
1350                 }
1351                 Def::Variant(..) | Def::Enum(..) |
1352                 Def::TyAlias(..) | Def::Struct(..) => {
1353                     paths_to_process.push((id, p.clone(), Some(ref_kind)))
1354                 }
1355                 // FIXME(nrc) what are these doing here?
1356                 Def::Static(_, _) |
1357                 Def::Const(..) |
1358                 Def::AssociatedConst(..) => {}
1359                 _ => error!("unexpected definition kind when processing collected paths: {:?}",
1360                             def),
1361             }
1362         }
1363
1364         for &(id, ref path, ref_kind) in &paths_to_process {
1365             self.process_path(id, path, ref_kind);
1366         }
1367         walk_list!(self, visit_expr, &arm.guard);
1368         self.visit_expr(&arm.body);
1369     }
1370
1371     fn visit_stmt(&mut self, s: &ast::Stmt) {
1372         let id = s.node.id();
1373         self.process_macro_use(s.span, id.unwrap());
1374         visit::walk_stmt(self, s)
1375     }
1376
1377     fn visit_local(&mut self, l: &ast::Local) {
1378         self.process_macro_use(l.span, l.id);
1379         let value = self.span.snippet(l.span);
1380         self.process_var_decl(&l.pat, value);
1381
1382         // Just walk the initialiser and type (don't want to walk the pattern again).
1383         walk_list!(self, visit_ty, &l.ty);
1384         walk_list!(self, visit_expr, &l.init);
1385     }
1386 }