src/librustc_trans/save/dump_csv.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 //! Output a CSV file containing the output from rustc's analysis. 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 //! Recorder is used for recording the output in csv format. FmtStrs separates
  27 //! the format of the output away from extracting it from the compiler.
  28 //! DumpCsvVisitor walks the AST and processes it.
  29
  30
  31 use super::{escape, generated_code, recorder, SaveContext, PathCollector};
  32
  33 use session::Session;
  34
  35 use middle::def;
  36 use middle::ty::{self, Ty};
  37 use rustc::ast_map::NodeItem;
  38
  39 use std::cell::Cell;
  40 use std::fs::File;
  41 use std::path::Path;
  42
  43 use syntax::ast_util;
  44 use syntax::ast::{self, NodeId, DefId};
  45 use syntax::codemap::*;
  46 use syntax::parse::token::{self, get_ident, keywords};
  47 use syntax::owned_slice::OwnedSlice;
  48 use syntax::visit::{self, Visitor};
  49 use syntax::print::pprust::{path_to_string, ty_to_string};
  50 use syntax::ptr::P;
  51
  52 use super::span_utils::SpanUtils;
  53 use super::recorder::{Recorder, FmtStrs};
  54
  55 macro_rules! down_cast_data {
  56     ($id:ident, $kind:ident, $this:ident, $sp:expr) => {
  57         let $id = if let super::Data::$kind(data) = $id {
  58             data
  59         } else {
  60             $this.sess.span_bug($sp, &format!("unexpected data kind: {:?}", $id));
  61         };
  62     };
  63 }
  64
  65 pub struct DumpCsvVisitor<'l, 'tcx: 'l> {
  66     save_ctxt: SaveContext<'l, 'tcx>,
  67     sess: &'l Session,
  68     tcx: &'l ty::ctxt<'tcx>,
  69     analysis: &'l ty::CrateAnalysis,
  70
  71     span: SpanUtils<'l>,
  72     fmt: FmtStrs<'l>,
  73
  74     cur_scope: NodeId
  75 }
  76
  77 impl <'l, 'tcx> DumpCsvVisitor<'l, 'tcx> {
  78     pub fn new(tcx: &'l ty::ctxt<'tcx>,
  79                analysis: &'l ty::CrateAnalysis,
  80                output_file: Box<File>) -> DumpCsvVisitor<'l, 'tcx> {
  81         let span_utils = SpanUtils {
  82             sess: &tcx.sess,
  83             err_count: Cell::new(0)
  84         };
  85         DumpCsvVisitor {
  86             sess: &tcx.sess,
  87             tcx: tcx,
  88             save_ctxt: SaveContext::new(tcx, span_utils.clone()),
  89             analysis: analysis,
  90             span: span_utils.clone(),
  91             fmt: FmtStrs::new(box Recorder {
  92                                 out: output_file,
  93                                 dump_spans: false,
  94                               }, span_utils),
  95             cur_scope: 0
  96         }
  97     }
  98
  99     fn nest<F>(&mut self, scope_id: NodeId, f: F) where
 100         F: FnOnce(&mut DumpCsvVisitor<'l, 'tcx>),
 101     {
 102         let parent_scope = self.cur_scope;
 103         self.cur_scope = scope_id;
 104         f(self);
 105         self.cur_scope = parent_scope;
 106     }
 107
 108     pub fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
 109         // The current crate.
 110         self.fmt.crate_str(krate.span, name);
 111
 112         // Dump info about all the external crates referenced from this crate.
 113         for c in &self.save_ctxt.get_external_crates() {
 114             self.fmt.external_crate_str(krate.span, &c.name, c.number);
 115         }
 116         self.fmt.recorder.record("end_external_crates\n");
 117     }
 118
 119     // Return all non-empty prefixes of a path.
 120     // For each prefix, we return the span for the last segment in the prefix and
 121     // a str representation of the entire prefix.
 122     fn process_path_prefixes(&self, path: &ast::Path) -> Vec<(Span, String)> {
 123         let spans = self.span.spans_for_path_segments(path);
 124
 125         // Paths to enums seem to not match their spans - the span includes all the
 126         // variants too. But they seem to always be at the end, so I hope we can cope with
 127         // always using the first ones. So, only error out if we don't have enough spans.
 128         // What could go wrong...?
 129         if spans.len() < path.segments.len() {
 130             error!("Mis-calculated spans for path '{}'. \
 131                     Found {} spans, expected {}. Found spans:",
 132                    path_to_string(path), spans.len(), path.segments.len());
 133             for s in &spans {
 134                 let loc = self.sess.codemap().lookup_char_pos(s.lo);
 135                 error!("    '{}' in {}, line {}",
 136                        self.span.snippet(*s), loc.file.name, loc.line);
 137             }
 138             return vec!();
 139         }
 140
 141         let mut result: Vec<(Span, String)> = vec!();
 142
 143         let mut segs = vec!();
 144         for (i, (seg, span)) in path.segments.iter().zip(&spans).enumerate() {
 145             segs.push(seg.clone());
 146             let sub_path = ast::Path{span: *span, // span for the last segment
 147                                      global: path.global,
 148                                      segments: segs};
 149             let qualname = if i == 0 && path.global {
 150                 format!("::{}", path_to_string(&sub_path))
 151             } else {
 152                 path_to_string(&sub_path)
 153             };
 154             result.push((*span, qualname));
 155             segs = sub_path.segments;
 156         }
 157
 158         result
 159     }
 160
 161     // The global arg allows us to override the global-ness of the path (which
 162     // actually means 'does the path start with `::`', rather than 'is the path
 163     // semantically global). We use the override for `use` imports (etc.) where
 164     // the syntax is non-global, but the semantics are global.
 165     fn write_sub_paths(&mut self, path: &ast::Path, global: bool) {
 166         let sub_paths = self.process_path_prefixes(path);
 167         for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
 168             let qualname = if i == 0 && global && !path.global {
 169                 format!("::{}", qualname)
 170             } else {
 171                 qualname.clone()
 172             };
 173             self.fmt.sub_mod_ref_str(path.span,
 174                                      *span,
 175                                      &qualname,
 176                                      self.cur_scope);
 177         }
 178     }
 179
 180     // As write_sub_paths, but does not process the last ident in the path (assuming it
 181     // will be processed elsewhere). See note on write_sub_paths about global.
 182     fn write_sub_paths_truncated(&mut self, path: &ast::Path, global: bool) {
 183         let sub_paths = self.process_path_prefixes(path);
 184         let len = sub_paths.len();
 185         if len <= 1 {
 186             return;
 187         }
 188
 189         let sub_paths = &sub_paths[..len-1];
 190         for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
 191             let qualname = if i == 0 && global && !path.global {
 192                 format!("::{}", qualname)
 193             } else {
 194                 qualname.clone()
 195             };
 196             self.fmt.sub_mod_ref_str(path.span,
 197                                      *span,
 198                                      &qualname,
 199                                      self.cur_scope);
 200         }
 201     }
 202
 203     // As write_sub_paths, but expects a path of the form module_path::trait::method
 204     // Where trait could actually be a struct too.
 205     fn write_sub_path_trait_truncated(&mut self, path: &ast::Path) {
 206         let sub_paths = self.process_path_prefixes(path);
 207         let len = sub_paths.len();
 208         if len <= 1 {
 209             return;
 210         }
 211         let sub_paths = &sub_paths[.. (len-1)];
 212
 213         // write the trait part of the sub-path
 214         let (ref span, ref qualname) = sub_paths[len-2];
 215         self.fmt.sub_type_ref_str(path.span,
 216                                   *span,
 217                                   &qualname);
 218
 219         // write the other sub-paths
 220         if len <= 2 {
 221             return;
 222         }
 223         let sub_paths = &sub_paths[..len-2];
 224         for &(ref span, ref qualname) in sub_paths {
 225             self.fmt.sub_mod_ref_str(path.span,
 226                                      *span,
 227                                      &qualname,
 228                                      self.cur_scope);
 229         }
 230     }
 231
 232     // looks up anything, not just a type
 233     fn lookup_type_ref(&self, ref_id: NodeId) -> Option<DefId> {
 234         if !self.tcx.def_map.borrow().contains_key(&ref_id) {
 235             self.sess.bug(&format!("def_map has no key for {} in lookup_type_ref",
 236                                   ref_id));
 237         }
 238         let def = self.tcx.def_map.borrow().get(&ref_id).unwrap().full_def();
 239         match def {
 240             def::DefPrimTy(_) => None,
 241             _ => Some(def.def_id()),
 242         }
 243     }
 244
 245     fn lookup_def_kind(&self, ref_id: NodeId, span: Span) -> Option<recorder::Row> {
 246         let def_map = self.tcx.def_map.borrow();
 247         if !def_map.contains_key(&ref_id) {
 248             self.sess.span_bug(span, &format!("def_map has no key for {} in lookup_def_kind",
 249                                              ref_id));
 250         }
 251         let def = def_map.get(&ref_id).unwrap().full_def();
 252         match def {
 253             def::DefMod(_) |
 254             def::DefForeignMod(_) => Some(recorder::ModRef),
 255             def::DefStruct(_) => Some(recorder::TypeRef),
 256             def::DefTy(..) |
 257             def::DefAssociatedTy(..) |
 258             def::DefTrait(_) => Some(recorder::TypeRef),
 259             def::DefStatic(_, _) |
 260             def::DefConst(_) |
 261             def::DefAssociatedConst(..) |
 262             def::DefLocal(_) |
 263             def::DefVariant(_, _, _) |
 264             def::DefUpvar(..) => Some(recorder::VarRef),
 265
 266             def::DefFn(..) => Some(recorder::FnRef),
 267
 268             def::DefSelfTy(..) |
 269             def::DefRegion(_) |
 270             def::DefLabel(_) |
 271             def::DefTyParam(..) |
 272             def::DefUse(_) |
 273             def::DefMethod(..) |
 274             def::DefPrimTy(_) => {
 275                 self.sess.span_bug(span, &format!("lookup_def_kind for unexpected item: {:?}",
 276                                                  def));
 277             },
 278         }
 279     }
 280
 281     fn process_formals(&mut self, formals: &Vec<ast::Arg>, qualname: &str) {
 282         for arg in formals {
 283             self.visit_pat(&arg.pat);
 284             let mut collector = PathCollector::new();
 285             collector.visit_pat(&arg.pat);
 286             let span_utils = self.span.clone();
 287             for &(id, ref p, _, _) in &collector.collected_paths {
 288                 let typ = self.tcx.node_types().get(&id).unwrap().to_string();
 289                 // get the span only for the name of the variable (I hope the path is only ever a
 290                 // variable name, but who knows?)
 291                 self.fmt.formal_str(p.span,
 292                                     span_utils.span_for_last_ident(p.span),
 293                                     id,
 294                                     qualname,
 295                                     &path_to_string(p),
 296                                     &typ);
 297             }
 298         }
 299     }
 300
 301     fn process_method(&mut self, sig: &ast::MethodSig,
 302                       body: Option<&ast::Block>,
 303                       id: ast::NodeId, name: ast::Name,
 304                       span: Span) {
 305         if generated_code(span) {
 306             return;
 307         }
 308
 309         debug!("process_method: {}:{}", id, token::get_name(name));
 310
 311         let scope_id;
 312         // The qualname for a method is the trait name or name of the struct in an impl in
 313         // which the method is declared in, followed by the method's name.
 314         let qualname = match self.tcx.impl_of_method(ast_util::local_def(id)) {
 315             Some(impl_id) => match self.tcx.map.get(impl_id.node) {
 316                 NodeItem(item) => {
 317                     scope_id = item.id;
 318                     match item.node {
 319                         ast::ItemImpl(_, _, _, _, ref ty, _) => {
 320                             let mut result = String::from("<");
 321                             result.push_str(&ty_to_string(&**ty));
 322
 323                             match self.tcx.trait_of_item(ast_util::local_def(id)) {
 324                                 Some(def_id) => {
 325                                     result.push_str(" as ");
 326                                     result.push_str(
 327                                         &self.tcx.item_path_str(def_id));
 328                                 },
 329                                 None => {}
 330                             }
 331                             result.push_str(">");
 332                             result
 333                         }
 334                         _ => {
 335                             self.sess.span_bug(span,
 336                                 &format!("Container {} for method {} not an impl?",
 337                                          impl_id.node, id));
 338                         },
 339                     }
 340                 },
 341                 _ => {
 342                     self.sess.span_bug(span,
 343                         &format!("Container {} for method {} is not a node item {:?}",
 344                                  impl_id.node, id, self.tcx.map.get(impl_id.node)));
 345                 },
 346             },
 347             None => match self.tcx.trait_of_item(ast_util::local_def(id)) {
 348                 Some(def_id) => {
 349                     scope_id = def_id.node;
 350                     match self.tcx.map.get(def_id.node) {
 351                         NodeItem(_) => {
 352                             format!("::{}", self.tcx.item_path_str(def_id))
 353                         }
 354                         _ => {
 355                             self.sess.span_bug(span,
 356                                 &format!("Could not find container {} for method {}",
 357                                          def_id.node, id));
 358                         }
 359                     }
 360                 },
 361                 None => {
 362                     self.sess.span_bug(span,
 363                         &format!("Could not find container for method {}", id));
 364                 },
 365             },
 366         };
 367
 368         let qualname = &format!("{}::{}", qualname, &token::get_name(name));
 369
 370         // record the decl for this def (if it has one)
 371         let decl_id = self.tcx.trait_item_of_item(ast_util::local_def(id))
 372             .and_then(|new_id| {
 373                 let def_id = new_id.def_id();
 374                 if def_id.node != 0 && def_id != ast_util::local_def(id) {
 375                     Some(def_id)
 376                 } else {
 377                     None
 378                 }
 379             });
 380
 381         let sub_span = self.span.sub_span_after_keyword(span, keywords::Fn);
 382         if body.is_some() {
 383             self.fmt.method_str(span,
 384                                 sub_span,
 385                                 id,
 386                                 qualname,
 387                                 decl_id,
 388                                 scope_id);
 389             self.process_formals(&sig.decl.inputs, qualname);
 390         } else {
 391             self.fmt.method_decl_str(span,
 392                                      sub_span,
 393                                      id,
 394                                      qualname,
 395                                      scope_id);
 396         }
 397
 398         // walk arg and return types
 399         for arg in &sig.decl.inputs {
 400             self.visit_ty(&arg.ty);
 401         }
 402
 403         if let ast::Return(ref ret_ty) = sig.decl.output {
 404             self.visit_ty(ret_ty);
 405         }
 406
 407         // walk the fn body
 408         if let Some(body) = body {
 409             self.nest(id, |v| v.visit_block(body));
 410         }
 411
 412         self.process_generic_params(&sig.generics,
 413                                     span,
 414                                     qualname,
 415                                     id);
 416     }
 417
 418     fn process_trait_ref(&mut self, trait_ref: &ast::TraitRef) {
 419         let trait_ref_data = self.save_ctxt.get_trait_ref_data(trait_ref, self.cur_scope);
 420         if let Some(trait_ref_data) = trait_ref_data {
 421             self.fmt.ref_str(recorder::TypeRef,
 422                              trait_ref.path.span,
 423                              Some(trait_ref_data.span),
 424                              trait_ref_data.ref_id,
 425                              trait_ref_data.scope);
 426             visit::walk_path(self, &trait_ref.path);
 427         }
 428     }
 429
 430     fn process_struct_field_def(&mut self,
 431                                 field: &ast::StructField,
 432                                 parent_id: NodeId) {
 433         let field_data = self.save_ctxt.get_field_data(field, parent_id);
 434         if let Some(field_data) = field_data {
 435             down_cast_data!(field_data, VariableData, self, field.span);
 436             self.fmt.field_str(field.span,
 437                                Some(field_data.span),
 438                                field_data.id,
 439                                &field_data.name,
 440                                &field_data.qualname,
 441                                &field_data.type_value,
 442                                field_data.scope);
 443         }
 444     }
 445
 446     // Dump generic params bindings, then visit_generics
 447     fn process_generic_params(&mut self,
 448                               generics:&ast::Generics,
 449                               full_span: Span,
 450                               prefix: &str,
 451                               id: NodeId) {
 452         // We can't only use visit_generics since we don't have spans for param
 453         // bindings, so we reparse the full_span to get those sub spans.
 454         // However full span is the entire enum/fn/struct block, so we only want
 455         // the first few to match the number of generics we're looking for.
 456         let param_sub_spans = self.span.spans_for_ty_params(full_span,
 457                                                            (generics.ty_params.len() as isize));
 458         for (param, param_ss) in generics.ty_params.iter().zip(param_sub_spans) {
 459             // Append $id to name to make sure each one is unique
 460             let name = format!("{}::{}${}",
 461                                prefix,
 462                                escape(self.span.snippet(param_ss)),
 463                                id);
 464             self.fmt.typedef_str(full_span,
 465                                  Some(param_ss),
 466                                  param.id,
 467                                  &name,
 468                                  "");
 469         }
 470         self.visit_generics(generics);
 471     }
 472
 473     fn process_fn(&mut self,
 474                   item: &ast::Item,
 475                   decl: &ast::FnDecl,
 476                   ty_params: &ast::Generics,
 477                   body: &ast::Block) {
 478         let fn_data = self.save_ctxt.get_item_data(item);
 479         down_cast_data!(fn_data, FunctionData, self, item.span);
 480         self.fmt.fn_str(item.span,
 481                         Some(fn_data.span),
 482                         fn_data.id,
 483                         &fn_data.qualname,
 484                         fn_data.scope);
 485
 486
 487         self.process_formals(&decl.inputs, &fn_data.qualname);
 488         self.process_generic_params(ty_params, item.span, &fn_data.qualname, item.id);
 489
 490         for arg in &decl.inputs {
 491             self.visit_ty(&arg.ty);
 492         }
 493
 494         if let ast::Return(ref ret_ty) = decl.output {
 495             self.visit_ty(&ret_ty);
 496         }
 497
 498         self.nest(item.id, |v| v.visit_block(&body));
 499     }
 500
 501     fn process_static_or_const_item(&mut self,
 502                                     item: &ast::Item,
 503                                     typ: &ast::Ty,
 504                                     expr: &ast::Expr)
 505     {
 506         let var_data = self.save_ctxt.get_item_data(item);
 507         down_cast_data!(var_data, VariableData, self, item.span);
 508         self.fmt.static_str(item.span,
 509                             Some(var_data.span),
 510                             var_data.id,
 511                             &var_data.name,
 512                             &var_data.qualname,
 513                             &var_data.value,
 514                             &var_data.type_value,
 515                             var_data.scope);
 516
 517         self.visit_ty(&typ);
 518         self.visit_expr(expr);
 519     }
 520
 521     fn process_const(&mut self,
 522                      id: ast::NodeId,
 523                      ident: &ast::Ident,
 524                      span: Span,
 525                      typ: &ast::Ty,
 526                      expr: &ast::Expr)
 527     {
 528         let qualname = format!("::{}", self.tcx.map.path_to_string(id));
 529
 530         let sub_span = self.span.sub_span_after_keyword(span,
 531                                                         keywords::Const);
 532
 533         self.fmt.static_str(span,
 534                             sub_span,
 535                             id,
 536                             &get_ident((*ident).clone()),
 537                             &qualname,
 538                             &self.span.snippet(expr.span),
 539                             &ty_to_string(&*typ),
 540                             self.cur_scope);
 541
 542         // walk type and init value
 543         self.visit_ty(typ);
 544         self.visit_expr(expr);
 545     }
 546
 547     fn process_struct(&mut self,
 548                       item: &ast::Item,
 549                       def: &ast::StructDef,
 550                       ty_params: &ast::Generics) {
 551         let qualname = format!("::{}", self.tcx.map.path_to_string(item.id));
 552
 553         let ctor_id = match def.ctor_id {
 554             Some(node_id) => node_id,
 555             None => -1,
 556         };
 557         let val = self.span.snippet(item.span);
 558         let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Struct);
 559         self.fmt.struct_str(item.span,
 560                             sub_span,
 561                             item.id,
 562                             ctor_id,
 563                             &qualname,
 564                             self.cur_scope,
 565                             &val);
 566
 567         // fields
 568         for field in &def.fields {
 569             self.process_struct_field_def(field, item.id);
 570             self.visit_ty(&field.node.ty);
 571         }
 572
 573         self.process_generic_params(ty_params, item.span, &qualname, item.id);
 574     }
 575
 576     fn process_enum(&mut self,
 577                     item: &ast::Item,
 578                     enum_definition: &ast::EnumDef,
 579                     ty_params: &ast::Generics) {
 580         let enum_data = self.save_ctxt.get_item_data(item);
 581         down_cast_data!(enum_data, EnumData, self, item.span);
 582         self.fmt.enum_str(item.span,
 583                           Some(enum_data.span),
 584                           enum_data.id,
 585                           &enum_data.qualname,
 586                           enum_data.scope,
 587                           &enum_data.value);
 588
 589         for variant in &enum_definition.variants {
 590             let name = &get_ident(variant.node.name);
 591             let mut qualname = enum_data.qualname.clone();
 592             qualname.push_str("::");
 593             qualname.push_str(name);
 594             let val = self.span.snippet(variant.span);
 595             match variant.node.kind {
 596                 ast::TupleVariantKind(ref args) => {
 597                     // first ident in span is the variant's name
 598                     self.fmt.tuple_variant_str(variant.span,
 599                                                self.span.span_for_first_ident(variant.span),
 600                                                variant.node.id,
 601                                                name,
 602                                                &qualname,
 603                                                &enum_data.qualname,
 604                                                &val,
 605                                                enum_data.id);
 606                     for arg in args {
 607                         self.visit_ty(&*arg.ty);
 608                     }
 609                 }
 610                 ast::StructVariantKind(ref struct_def) => {
 611                     let ctor_id = match struct_def.ctor_id {
 612                         Some(node_id) => node_id,
 613                         None => -1,
 614                     };
 615                     self.fmt.struct_variant_str(variant.span,
 616                                                 self.span.span_for_first_ident(variant.span),
 617                                                 variant.node.id,
 618                                                 ctor_id,
 619                                                 &qualname,
 620                                                 &enum_data.qualname,
 621                                                 &val,
 622                                                 enum_data.id);
 623
 624                     for field in &struct_def.fields {
 625                         self.process_struct_field_def(field, variant.node.id);
 626                         self.visit_ty(&*field.node.ty);
 627                     }
 628                 }
 629             }
 630         }
 631         self.process_generic_params(ty_params, item.span, &enum_data.qualname, enum_data.id);
 632     }
 633
 634     fn process_impl(&mut self,
 635                     item: &ast::Item,
 636                     type_parameters: &ast::Generics,
 637                     trait_ref: &Option<ast::TraitRef>,
 638                     typ: &ast::Ty,
 639                     impl_items: &[P<ast::ImplItem>]) {
 640         let impl_data = self.save_ctxt.get_item_data(item);
 641         down_cast_data!(impl_data, ImplData, self, item.span);
 642         match impl_data.self_ref {
 643             Some(ref self_ref) => {
 644                 self.fmt.ref_str(recorder::TypeRef,
 645                                  item.span,
 646                                  Some(self_ref.span),
 647                                  self_ref.ref_id,
 648                                  self_ref.scope);
 649             }
 650             None => {
 651                 self.visit_ty(&typ);
 652             }
 653         }
 654         if let Some(ref trait_ref_data) = impl_data.trait_ref {
 655             self.fmt.ref_str(recorder::TypeRef,
 656                              item.span,
 657                              Some(trait_ref_data.span),
 658                              trait_ref_data.ref_id,
 659                              trait_ref_data.scope);
 660             visit::walk_path(self, &trait_ref.as_ref().unwrap().path);
 661         }
 662
 663         self.fmt.impl_str(item.span,
 664                           Some(impl_data.span),
 665                           impl_data.id,
 666                           impl_data.self_ref.map(|data| data.ref_id),
 667                           impl_data.trait_ref.map(|data| data.ref_id),
 668                           impl_data.scope);
 669
 670         self.process_generic_params(type_parameters, item.span, "", item.id);
 671         for impl_item in impl_items {
 672             self.visit_impl_item(impl_item);
 673         }
 674     }
 675
 676     fn process_trait(&mut self,
 677                      item: &ast::Item,
 678                      generics: &ast::Generics,
 679                      trait_refs: &OwnedSlice<ast::TyParamBound>,
 680                      methods: &[P<ast::TraitItem>]) {
 681         let qualname = format!("::{}", self.tcx.map.path_to_string(item.id));
 682         let val = self.span.snippet(item.span);
 683         let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Trait);
 684         self.fmt.trait_str(item.span,
 685                            sub_span,
 686                            item.id,
 687                            &qualname,
 688                            self.cur_scope,
 689                            &val);
 690
 691         // super-traits
 692         for super_bound in trait_refs.iter() {
 693             let trait_ref = match *super_bound {
 694                 ast::TraitTyParamBound(ref trait_ref, _) => {
 695                     trait_ref
 696                 }
 697                 ast::RegionTyParamBound(..) => {
 698                     continue;
 699                 }
 700             };
 701
 702             let trait_ref = &trait_ref.trait_ref;
 703             match self.lookup_type_ref(trait_ref.ref_id) {
 704                 Some(id) => {
 705                     let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
 706                     self.fmt.ref_str(recorder::TypeRef,
 707                                      trait_ref.path.span,
 708                                      sub_span,
 709                                      id,
 710                                      self.cur_scope);
 711                     self.fmt.inherit_str(trait_ref.path.span,
 712                                          sub_span,
 713                                          id,
 714                                          item.id);
 715                 },
 716                 None => ()
 717             }
 718         }
 719
 720         // walk generics and methods
 721         self.process_generic_params(generics, item.span, &qualname, item.id);
 722         for method in methods {
 723             self.visit_trait_item(method)
 724         }
 725     }
 726
 727     fn process_mod(&mut self,
 728                    item: &ast::Item) {  // The module in question, represented as an item.
 729         let mod_data = self.save_ctxt.get_item_data(item);
 730         down_cast_data!(mod_data, ModData, self, item.span);
 731         self.fmt.mod_str(item.span,
 732                          Some(mod_data.span),
 733                          mod_data.id,
 734                          &mod_data.qualname,
 735                          mod_data.scope,
 736                          &mod_data.filename);
 737     }
 738
 739     fn process_path(&mut self,
 740                     id: NodeId,
 741                     span: Span,
 742                     path: &ast::Path,
 743                     ref_kind: Option<recorder::Row>) {
 744         if generated_code(span) {
 745             return
 746         }
 747
 748         let def_map = self.tcx.def_map.borrow();
 749         if !def_map.contains_key(&id) {
 750             self.sess.span_bug(span,
 751                                &format!("def_map has no key for {} in visit_expr", id));
 752         }
 753         let def = def_map.get(&id).unwrap().full_def();
 754         let sub_span = self.span.span_for_last_ident(span);
 755         match def {
 756             def::DefUpvar(..) |
 757             def::DefLocal(..) |
 758             def::DefStatic(..) |
 759             def::DefConst(..) |
 760             def::DefAssociatedConst(..) |
 761             def::DefVariant(..) => self.fmt.ref_str(ref_kind.unwrap_or(recorder::VarRef),
 762                                                     span,
 763                                                     sub_span,
 764                                                     def.def_id(),
 765                                                     self.cur_scope),
 766             def::DefStruct(def_id) => self.fmt.ref_str(recorder::TypeRef,
 767                                                        span,
 768                                                        sub_span,
 769                                                        def_id,
 770                                                        self.cur_scope),
 771             def::DefTy(def_id, _) => self.fmt.ref_str(recorder::TypeRef,
 772                                                       span,
 773                                                       sub_span,
 774                                                       def_id,
 775                                                       self.cur_scope),
 776             def::DefMethod(declid, provenence) => {
 777                 let sub_span = self.span.sub_span_for_meth_name(span);
 778                 let defid = if declid.krate == ast::LOCAL_CRATE {
 779                     let ti = self.tcx.impl_or_trait_item(declid);
 780                     match provenence {
 781                         def::FromTrait(def_id) => {
 782                             Some(self.tcx.trait_items(def_id)
 783                                     .iter()
 784                                     .find(|mr| {
 785                                         mr.name() == ti.name()
 786                                     })
 787                                     .unwrap()
 788                                     .def_id())
 789                         }
 790                         def::FromImpl(def_id) => {
 791                             let impl_items = self.tcx.impl_items.borrow();
 792                             Some(impl_items.get(&def_id)
 793                                            .unwrap()
 794                                            .iter()
 795                                            .find(|mr| {
 796                                                 self.tcx.impl_or_trait_item(mr.def_id()).name()
 797                                                     == ti.name()
 798                                             })
 799                                            .unwrap()
 800                                            .def_id())
 801                         }
 802                     }
 803                 } else {
 804                     None
 805                 };
 806                 self.fmt.meth_call_str(span,
 807                                        sub_span,
 808                                        defid,
 809                                        Some(declid),
 810                                        self.cur_scope);
 811             },
 812             def::DefFn(def_id, _) => {
 813                 self.fmt.fn_call_str(span,
 814                                      sub_span,
 815                                      def_id,
 816                                      self.cur_scope)
 817             }
 818             _ => self.sess.span_bug(span,
 819                                     &format!("Unexpected def kind while looking \
 820                                               up path in `{}`: `{:?}`",
 821                                              self.span.snippet(span),
 822                                              def)),
 823         }
 824         // modules or types in the path prefix
 825         match def {
 826             def::DefMethod(did, _) => {
 827                 let ti = self.tcx.impl_or_trait_item(did);
 828                 if let ty::MethodTraitItem(m) = ti {
 829                     if m.explicit_self == ty::StaticExplicitSelfCategory {
 830                         self.write_sub_path_trait_truncated(path);
 831                     }
 832                 }
 833             }
 834             def::DefLocal(_) |
 835             def::DefStatic(_,_) |
 836             def::DefConst(..) |
 837             def::DefAssociatedConst(..) |
 838             def::DefStruct(_) |
 839             def::DefVariant(..) |
 840             def::DefFn(..) => self.write_sub_paths_truncated(path, false),
 841             _ => {},
 842         }
 843     }
 844
 845     fn process_struct_lit(&mut self,
 846                           ex: &ast::Expr,
 847                           path: &ast::Path,
 848                           fields: &Vec<ast::Field>,
 849                           base: &Option<P<ast::Expr>>) {
 850         if generated_code(path.span) {
 851             return
 852         }
 853
 854         self.write_sub_paths_truncated(path, false);
 855
 856         if let Some(struct_lit_data) = self.save_ctxt.get_expr_data(ex) {
 857             down_cast_data!(struct_lit_data, TypeRefData, self, ex.span);
 858             self.fmt.ref_str(recorder::TypeRef,
 859                              ex.span,
 860                              Some(struct_lit_data.span),
 861                              struct_lit_data.ref_id,
 862                              struct_lit_data.scope);
 863             let struct_def = struct_lit_data.ref_id;
 864
 865             for field in fields {
 866                 if generated_code(field.ident.span) {
 867                     continue;
 868                 }
 869
 870                 let field_data = self.save_ctxt.get_field_ref_data(field,
 871                                                                    struct_def,
 872                                                                    self.cur_scope);
 873                 self.fmt.ref_str(recorder::VarRef,
 874                                  field.ident.span,
 875                                  Some(field_data.span),
 876                                  field_data.ref_id,
 877                                  field_data.scope);
 878
 879                 self.visit_expr(&field.expr)
 880             }
 881         }
 882
 883         visit::walk_expr_opt(self, base)
 884     }
 885
 886     fn process_method_call(&mut self,
 887                            ex: &ast::Expr,
 888                            args: &Vec<P<ast::Expr>>) {
 889         let method_map = &self.tcx.tables.borrow().method_map;
 890         let method_callee = method_map.get(&ty::MethodCall::expr(ex.id)).unwrap();
 891         let (def_id, decl_id) = match method_callee.origin {
 892             ty::MethodStatic(def_id) |
 893             ty::MethodStaticClosure(def_id) => {
 894                 // method invoked on an object with a concrete type (not a static method)
 895                 let decl_id =
 896                     match self.tcx.trait_item_of_item(def_id) {
 897                         None => None,
 898                         Some(decl_id) => Some(decl_id.def_id()),
 899                     };
 900
 901                 // This incantation is required if the method referenced is a
 902                 // trait's default implementation.
 903                 let def_id = match self.tcx.impl_or_trait_item(def_id) {
 904                     ty::MethodTraitItem(method) => {
 905                         method.provided_source.unwrap_or(def_id)
 906                     }
 907                     _ => self.sess
 908                              .span_bug(ex.span,
 909                                        "save::process_method_call: non-method \
 910                                         DefId in MethodStatic or MethodStaticClosure"),
 911                 };
 912                 (Some(def_id), decl_id)
 913             }
 914             ty::MethodTypeParam(ref mp) => {
 915                 // method invoked on a type parameter
 916                 let trait_item = self.tcx.trait_item(mp.trait_ref.def_id,
 917                                                      mp.method_num);
 918                 (None, Some(trait_item.def_id()))
 919             }
 920             ty::MethodTraitObject(ref mo) => {
 921                 // method invoked on a trait instance
 922                 let trait_item = self.tcx.trait_item(mo.trait_ref.def_id,
 923                                                      mo.method_num);
 924                 (None, Some(trait_item.def_id()))
 925             }
 926         };
 927         let sub_span = self.span.sub_span_for_meth_name(ex.span);
 928         self.fmt.meth_call_str(ex.span,
 929                                sub_span,
 930                                def_id,
 931                                decl_id,
 932                                self.cur_scope);
 933
 934         // walk receiver and args
 935         visit::walk_exprs(self, &args);
 936     }
 937
 938     fn process_pat(&mut self, p:&ast::Pat) {
 939         if generated_code(p.span) {
 940             return;
 941         }
 942
 943         match p.node {
 944             ast::PatStruct(ref path, ref fields, _) => {
 945                 visit::walk_path(self, path);
 946
 947                 let def = self.tcx.def_map.borrow().get(&p.id).unwrap().full_def();
 948                 let struct_def = match def {
 949                     def::DefConst(..) | def::DefAssociatedConst(..) => None,
 950                     def::DefVariant(_, variant_id, _) => Some(variant_id),
 951                     _ => {
 952                         match self.tcx.node_id_to_type(p.id).ty_to_def_id() {
 953                             None => {
 954                                 self.sess.span_bug(p.span,
 955                                                    &format!("Could not find struct_def for `{}`",
 956                                                             self.span.snippet(p.span)));
 957                             }
 958                             Some(def_id) => Some(def_id),
 959                         }
 960                     }
 961                 };
 962
 963                 if let Some(struct_def) = struct_def {
 964                     let struct_fields = self.tcx.lookup_struct_fields(struct_def);
 965                     for &Spanned { node: ref field, span } in fields {
 966                         if generated_code(span) {
 967                             continue;
 968                         }
 969
 970                         let sub_span = self.span.span_for_first_ident(span);
 971                         for f in &struct_fields {
 972                             if f.name == field.ident.name {
 973                                 self.fmt.ref_str(recorder::VarRef,
 974                                                  span,
 975                                                  sub_span,
 976                                                  f.id,
 977                                                  self.cur_scope);
 978                                 break;
 979                             }
 980                         }
 981                         self.visit_pat(&field.pat);
 982                     }
 983                 }
 984             }
 985             _ => visit::walk_pat(self, p)
 986         }
 987     }
 988 }
 989
 990 impl<'l, 'tcx, 'v> Visitor<'v> for DumpCsvVisitor<'l, 'tcx> {
 991     fn visit_item(&mut self, item: &ast::Item) {
 992         if generated_code(item.span) {
 993             return
 994         }
 995
 996         match item.node {
 997             ast::ItemUse(ref use_item) => {
 998                 match use_item.node {
 999                     ast::ViewPathSimple(ident, ref path) => {
1000                         let sub_span = self.span.span_for_last_ident(path.span);
1001                         let mod_id = match self.lookup_type_ref(item.id) {
1002                             Some(def_id) => {
1003                                 match self.lookup_def_kind(item.id, path.span) {
1004                                     Some(kind) => self.fmt.ref_str(kind,
1005                                                                    path.span,
1006                                                                    sub_span,
1007                                                                    def_id,
1008                                                                    self.cur_scope),
1009                                     None => {},
1010                                 }
1011                                 Some(def_id)
1012                             },
1013                             None => None,
1014                         };
1015
1016                         // 'use' always introduces an alias, if there is not an explicit
1017                         // one, there is an implicit one.
1018                         let sub_span =
1019                             match self.span.sub_span_after_keyword(use_item.span, keywords::As) {
1020                                 Some(sub_span) => Some(sub_span),
1021                                 None => sub_span,
1022                             };
1023
1024                         self.fmt.use_alias_str(path.span,
1025                                                sub_span,
1026                                                item.id,
1027                                                mod_id,
1028                                                &get_ident(ident),
1029                                                self.cur_scope);
1030                         self.write_sub_paths_truncated(path, true);
1031                     }
1032                     ast::ViewPathGlob(ref path) => {
1033                         // Make a comma-separated list of names of imported modules.
1034                         let mut name_string = String::new();
1035                         let glob_map = &self.analysis.glob_map;
1036                         let glob_map = glob_map.as_ref().unwrap();
1037                         if glob_map.contains_key(&item.id) {
1038                             for n in glob_map.get(&item.id).unwrap() {
1039                                 if !name_string.is_empty() {
1040                                     name_string.push_str(", ");
1041                                 }
1042                                 name_string.push_str(n.as_str());
1043                             }
1044                         }
1045
1046                         let sub_span = self.span.sub_span_of_token(path.span,
1047                                                                    token::BinOp(token::Star));
1048                         self.fmt.use_glob_str(path.span,
1049                                               sub_span,
1050                                               item.id,
1051                                               &name_string,
1052                                               self.cur_scope);
1053                         self.write_sub_paths(path, true);
1054                     }
1055                     ast::ViewPathList(ref path, ref list) => {
1056                         for plid in list {
1057                             match plid.node {
1058                                 ast::PathListIdent { id, .. } => {
1059                                     match self.lookup_type_ref(id) {
1060                                         Some(def_id) =>
1061                                             match self.lookup_def_kind(id, plid.span) {
1062                                                 Some(kind) => {
1063                                                     self.fmt.ref_str(
1064                                                         kind, plid.span,
1065                                                         Some(plid.span),
1066                                                         def_id, self.cur_scope);
1067                                                 }
1068                                                 None => ()
1069                                             },
1070                                         None => ()
1071                                     }
1072                                 },
1073                                 ast::PathListMod { .. } => ()
1074                             }
1075                         }
1076
1077                         self.write_sub_paths(path, true);
1078                     }
1079                 }
1080             }
1081             ast::ItemExternCrate(ref s) => {
1082                 let name = get_ident(item.ident);
1083                 let name = &name;
1084                 let location = match *s {
1085                     Some(s) => s.to_string(),
1086                     None => name.to_string(),
1087                 };
1088                 let alias_span = self.span.span_for_last_ident(item.span);
1089                 let cnum = match self.sess.cstore.find_extern_mod_stmt_cnum(item.id) {
1090                     Some(cnum) => cnum,
1091                     None => 0,
1092                 };
1093                 self.fmt.extern_crate_str(item.span,
1094                                           alias_span,
1095                                           item.id,
1096                                           cnum,
1097                                           name,
1098                                           &location,
1099                                           self.cur_scope);
1100             }
1101             ast::ItemFn(ref decl, _, _, _, ref ty_params, ref body) =>
1102                 self.process_fn(item, &**decl, ty_params, &**body),
1103             ast::ItemStatic(ref typ, _, ref expr) =>
1104                 self.process_static_or_const_item(item, typ, expr),
1105             ast::ItemConst(ref typ, ref expr) =>
1106                 self.process_static_or_const_item(item, &typ, &expr),
1107             ast::ItemStruct(ref def, ref ty_params) => self.process_struct(item, &**def, ty_params),
1108             ast::ItemEnum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
1109             ast::ItemImpl(_, _,
1110                           ref ty_params,
1111                           ref trait_ref,
1112                           ref typ,
1113                           ref impl_items) => {
1114                 self.process_impl(item,
1115                                   ty_params,
1116                                   trait_ref,
1117                                   &typ,
1118                                   impl_items)
1119             }
1120             ast::ItemTrait(_, ref generics, ref trait_refs, ref methods) =>
1121                 self.process_trait(item, generics, trait_refs, methods),
1122             ast::ItemMod(ref m) => {
1123                 self.process_mod(item);
1124                 self.nest(item.id, |v| visit::walk_mod(v, m));
1125             }
1126             ast::ItemTy(ref ty, ref ty_params) => {
1127                 let qualname = format!("::{}", self.tcx.map.path_to_string(item.id));
1128                 let value = ty_to_string(&**ty);
1129                 let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Type);
1130                 self.fmt.typedef_str(item.span,
1131                                      sub_span,
1132                                      item.id,
1133                                      &qualname,
1134                                      &value);
1135
1136                 self.visit_ty(&**ty);
1137                 self.process_generic_params(ty_params, item.span, &qualname, item.id);
1138             },
1139             ast::ItemMac(_) => (),
1140             _ => visit::walk_item(self, item),
1141         }
1142     }
1143
1144     fn visit_generics(&mut self, generics: &ast::Generics) {
1145         for param in generics.ty_params.iter() {
1146             for bound in param.bounds.iter() {
1147                 if let ast::TraitTyParamBound(ref trait_ref, _) = *bound {
1148                     self.process_trait_ref(&trait_ref.trait_ref);
1149                 }
1150             }
1151             if let Some(ref ty) = param.default {
1152                 self.visit_ty(&**ty);
1153             }
1154         }
1155     }
1156
1157     fn visit_trait_item(&mut self, trait_item: &ast::TraitItem) {
1158         match trait_item.node {
1159             ast::ConstTraitItem(ref ty, Some(ref expr)) => {
1160                 self.process_const(trait_item.id, &trait_item.ident,
1161                                    trait_item.span, &*ty, &*expr);
1162             }
1163             ast::MethodTraitItem(ref sig, ref body) => {
1164                 self.process_method(sig, body.as_ref().map(|x| &**x),
1165                                     trait_item.id, trait_item.ident.name, trait_item.span);
1166             }
1167             ast::ConstTraitItem(_, None) |
1168             ast::TypeTraitItem(..) => {}
1169         }
1170     }
1171
1172     fn visit_impl_item(&mut self, impl_item: &ast::ImplItem) {
1173         match impl_item.node {
1174             ast::ConstImplItem(ref ty, ref expr) => {
1175                 self.process_const(impl_item.id, &impl_item.ident,
1176                                    impl_item.span, &ty, &expr);
1177             }
1178             ast::MethodImplItem(ref sig, ref body) => {
1179                 self.process_method(sig, Some(body), impl_item.id,
1180                                     impl_item.ident.name, impl_item.span);
1181             }
1182             ast::TypeImplItem(_) |
1183             ast::MacImplItem(_) => {}
1184         }
1185     }
1186
1187     fn visit_ty(&mut self, t: &ast::Ty) {
1188         if generated_code(t.span) {
1189             return
1190         }
1191
1192         match t.node {
1193             ast::TyPath(_, ref path) => {
1194                 match self.lookup_type_ref(t.id) {
1195                     Some(id) => {
1196                         let sub_span = self.span.sub_span_for_type_name(t.span);
1197                         self.fmt.ref_str(recorder::TypeRef,
1198                                          t.span,
1199                                          sub_span,
1200                                          id,
1201                                          self.cur_scope);
1202                     },
1203                     None => ()
1204                 }
1205
1206                 self.write_sub_paths_truncated(path, false);
1207
1208                 visit::walk_path(self, path);
1209             },
1210             _ => visit::walk_ty(self, t),
1211         }
1212     }
1213
1214     fn visit_expr(&mut self, ex: &ast::Expr) {
1215         if generated_code(ex.span) {
1216             return
1217         }
1218
1219         match ex.node {
1220             ast::ExprCall(ref _f, ref _args) => {
1221                 // Don't need to do anything for function calls,
1222                 // because just walking the callee path does what we want.
1223                 visit::walk_expr(self, ex);
1224             }
1225             ast::ExprPath(_, ref path) => {
1226                 self.process_path(ex.id, path.span, path, None);
1227                 visit::walk_expr(self, ex);
1228             }
1229             ast::ExprStruct(ref path, ref fields, ref base) =>
1230                 self.process_struct_lit(ex, path, fields, base),
1231             ast::ExprMethodCall(_, _, ref args) => self.process_method_call(ex, args),
1232             ast::ExprField(ref sub_ex, _) => {
1233                 if generated_code(sub_ex.span) {
1234                     return
1235                 }
1236
1237                 self.visit_expr(&sub_ex);
1238
1239                 if let Some(field_data) = self.save_ctxt.get_expr_data(ex) {
1240                     down_cast_data!(field_data, VariableRefData, self, ex.span);
1241                     self.fmt.ref_str(recorder::VarRef,
1242                                      ex.span,
1243                                      Some(field_data.span),
1244                                      field_data.ref_id,
1245                                      field_data.scope);
1246                 }
1247             },
1248             ast::ExprTupField(ref sub_ex, idx) => {
1249                 if generated_code(sub_ex.span) {
1250                     return
1251                 }
1252
1253                 self.visit_expr(&**sub_ex);
1254
1255                 let ty = &self.tcx.expr_ty_adjusted(&**sub_ex).sty;
1256                 match *ty {
1257                     ty::TyStruct(def_id, _) => {
1258                         let fields = self.tcx.lookup_struct_fields(def_id);
1259                         for (i, f) in fields.iter().enumerate() {
1260                             if i == idx.node {
1261                                 let sub_span = self.span.sub_span_after_token(ex.span, token::Dot);
1262                                 self.fmt.ref_str(recorder::VarRef,
1263                                                  ex.span,
1264                                                  sub_span,
1265                                                  f.id,
1266                                                  self.cur_scope);
1267                                 break;
1268                             }
1269                         }
1270                     }
1271                     ty::TyTuple(_) => {}
1272                     _ => self.sess.span_bug(ex.span,
1273                                             &format!("Expected struct or tuple \
1274                                                       type, found {:?}", ty)),
1275                 }
1276             },
1277             ast::ExprClosure(_, ref decl, ref body) => {
1278                 if generated_code(body.span) {
1279                     return
1280                 }
1281
1282                 let mut id = String::from("$");
1283                 id.push_str(&ex.id.to_string());
1284                 self.process_formals(&decl.inputs, &id);
1285
1286                 // walk arg and return types
1287                 for arg in &decl.inputs {
1288                     self.visit_ty(&*arg.ty);
1289                 }
1290
1291                 if let ast::Return(ref ret_ty) = decl.output {
1292                     self.visit_ty(&**ret_ty);
1293                 }
1294
1295                 // walk the body
1296                 self.nest(ex.id, |v| v.visit_block(&**body));
1297             },
1298             _ => {
1299                 visit::walk_expr(self, ex)
1300             }
1301         }
1302     }
1303
1304     fn visit_mac(&mut self, _: &ast::Mac) {
1305         // Just stop, macros are poison to us.
1306     }
1307
1308     fn visit_pat(&mut self, p: &ast::Pat) {
1309         self.process_pat(p);
1310     }
1311
1312     fn visit_arm(&mut self, arm: &ast::Arm) {
1313         let mut collector = PathCollector::new();
1314         for pattern in &arm.pats {
1315             // collect paths from the arm's patterns
1316             collector.visit_pat(&pattern);
1317             self.visit_pat(&pattern);
1318         }
1319
1320         // This is to get around borrow checking, because we need mut self to call process_path.
1321         let mut paths_to_process = vec![];
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                 self.sess.span_bug(p.span,
1327                                    &format!("def_map has no key for {} in visit_arm",
1328                                            id));
1329             }
1330             let def = def_map.get(&id).unwrap().full_def();
1331             match def {
1332                 def::DefLocal(id)  => {
1333                     let value = if immut == ast::MutImmutable {
1334                         self.span.snippet(p.span).to_string()
1335                     } else {
1336                         "<mutable>".to_string()
1337                     };
1338
1339                     assert!(p.segments.len() == 1, "qualified path for local variable def in arm");
1340                     self.fmt.variable_str(p.span,
1341                                           Some(p.span),
1342                                           id,
1343                                           &path_to_string(p),
1344                                           &value,
1345                                           "")
1346                 }
1347                 def::DefVariant(..) | def::DefTy(..) | def::DefStruct(..) => {
1348                     paths_to_process.push((id, p.clone(), Some(ref_kind)))
1349                 }
1350                 // FIXME(nrc) what are these doing here?
1351                 def::DefStatic(_, _) |
1352                 def::DefConst(..) |
1353                 def::DefAssociatedConst(..) => {}
1354                 _ => error!("unexpected definition kind when processing collected paths: {:?}",
1355                             def)
1356             }
1357         }
1358         for &(id, ref path, ref_kind) in &paths_to_process {
1359             self.process_path(id, path.span, path, ref_kind);
1360         }
1361         visit::walk_expr_opt(self, &arm.guard);
1362         self.visit_expr(&*arm.body);
1363     }
1364
1365     fn visit_stmt(&mut self, s: &ast::Stmt) {
1366         if generated_code(s.span) {
1367             return
1368         }
1369
1370         visit::walk_stmt(self, s)
1371     }
1372
1373     fn visit_local(&mut self, l: &ast::Local) {
1374         if generated_code(l.span) {
1375             return
1376         }
1377
1378         // The local could declare multiple new vars, we must walk the
1379         // pattern and collect them all.
1380         let mut collector = PathCollector::new();
1381         collector.visit_pat(&l.pat);
1382         self.visit_pat(&l.pat);
1383
1384         let value = self.span.snippet(l.span);
1385
1386         for &(id, ref p, immut, _) in &collector.collected_paths {
1387             let value = if immut == ast::MutImmutable {
1388                 value.to_string()
1389             } else {
1390                 "<mutable>".to_string()
1391             };
1392             let types = self.tcx.node_types();
1393             let typ = types.get(&id).unwrap().to_string();
1394             // Get the span only for the name of the variable (I hope the path
1395             // is only ever a variable name, but who knows?).
1396             let sub_span = self.span.span_for_last_ident(p.span);
1397             // Rust uses the id of the pattern for var lookups, so we'll use it too.
1398             self.fmt.variable_str(p.span,
1399                                   sub_span,
1400                                   id,
1401                                   &path_to_string(p),
1402                                   &value,
1403                                   &typ);
1404         }
1405
1406         // Just walk the initialiser and type (don't want to walk the pattern again).
1407         visit::walk_ty_opt(self, &l.ty);
1408         visit::walk_expr_opt(self, &l.init);
1409     }
1410 }