save-analysis: move csv dumping stuff to its own module and rename

src/librustc_trans/save/dump_csv.rs

+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Output a CSV file containing the output from rustc's analysis. The data is
+//! primarily designed to be used as input to the DXR tool, specifically its
+//! Rust plugin. It could also be used by IDEs or other code browsing, search, or
+//! cross-referencing tools.
+//!
+//! Dumping the analysis is implemented by walking the AST and getting a bunch of
+//! info out from all over the place. We use Def IDs to identify objects. The
+//! tricky part is getting syntactic (span, source text) and semantic (reference
+//! Def IDs) information for parts of expressions which the compiler has discarded.
+//! E.g., in a path `foo::bar::baz`, the compiler only keeps a span for the whole
+//! path and a reference to `baz`, but we want spans and references for all three
+//! idents.
+//!
+//! SpanUtils is used to manipulate spans. In particular, to extract sub-spans
+//! from spans (e.g., the span for `bar` from the above example path).
+//! Recorder is used for recording the output in csv format. FmtStrs separates
+//! the format of the output away from extracting it from the compiler.
+//! DumpCsvVisitor walks the AST and processes it.
+
+use super::{escape, generated_code, recorder};
+
+use session::Session;
+
+use middle::def;
+use middle::ty::{self, Ty};
+
+use std::cell::Cell;
+use std::fs::File;
+use std::path::Path;
+
+use syntax::ast_util;
+use syntax::ast::{self, NodeId, DefId};
+use syntax::ast_map::NodeItem;
+use syntax::codemap::*;
+use syntax::parse::token::{self, get_ident, keywords};
+use syntax::owned_slice::OwnedSlice;
+use syntax::visit::{self, Visitor};
+use syntax::print::pprust::{path_to_string, ty_to_string};
+use syntax::ptr::P;
+
+use super::span_utils::SpanUtils;
+use super::recorder::{Recorder, FmtStrs};
+
+use util::ppaux;
+
+
+pub struct DumpCsvVisitor<'l, 'tcx: 'l> {
+    sess: &'l Session,
+    analysis: &'l ty::CrateAnalysis<'tcx>,
+
+    collected_paths: Vec<(NodeId, ast::Path, bool, recorder::Row)>,
+    collecting: bool,
+
+    span: SpanUtils<'l>,
+    fmt: FmtStrs<'l>,
+
+    cur_scope: NodeId
+}
+
+impl <'l, 'tcx> DumpCsvVisitor<'l, 'tcx> {
+    fn nest<F>(&mut self, scope_id: NodeId, f: F) where
+        F: FnOnce(&mut DumpCsvVisitor<'l, 'tcx>),
+    {
+        let parent_scope = self.cur_scope;
+        self.cur_scope = scope_id;
+        f(self);
+        self.cur_scope = parent_scope;
+    }
+
+    pub fn new(sess: &'l Session,
+               analysis: &'l ty::CrateAnalysis<'tcx>,
+               output_file: Box<File>) -> DumpCsvVisitor<'l, 'tcx> {
+        DumpCsvVisitor {
+            sess: sess,
+            analysis: analysis,
+            collected_paths: vec![],
+            collecting: false,
+            span: SpanUtils {
+                sess: sess,
+                err_count: Cell::new(0)
+            },
+            fmt: FmtStrs::new(box Recorder {
+                                out: output_file,
+                                dump_spans: false,
+                            },
+                            SpanUtils {
+                                sess: sess,
+                                err_count: Cell::new(0)
+                            }),
+            cur_scope: 0            
+        }
+    }
+
+    pub fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
+        // the current crate
+        self.fmt.crate_str(krate.span, name);
+
+        // dump info about all the external crates referenced from this crate
+        self.sess.cstore.iter_crate_data(|n, cmd| {
+            self.fmt.external_crate_str(krate.span, &cmd.name, n);
+        });
+        self.fmt.recorder.record("end_external_crates\n");
+    }
+
+    // Return all non-empty prefixes of a path.
+    // For each prefix, we return the span for the last segment in the prefix and
+    // a str representation of the entire prefix.
+    fn process_path_prefixes(&self, path: &ast::Path) -> Vec<(Span, String)> {
+        let spans = self.span.spans_for_path_segments(path);
+
+        // Paths to enums seem to not match their spans - the span includes all the
+        // variants too. But they seem to always be at the end, so I hope we can cope with
+        // always using the first ones. So, only error out if we don't have enough spans.
+        // What could go wrong...?
+        if spans.len() < path.segments.len() {
+            error!("Mis-calculated spans for path '{}'. \
+                    Found {} spans, expected {}. Found spans:",
+                   path_to_string(path), spans.len(), path.segments.len());
+            for s in &spans {
+                let loc = self.sess.codemap().lookup_char_pos(s.lo);
+                error!("    '{}' in {}, line {}",
+                       self.span.snippet(*s), loc.file.name, loc.line);
+            }
+            return vec!();
+        }
+
+        let mut result: Vec<(Span, String)> = vec!();
+
+        let mut segs = vec!();
+        for (i, (seg, span)) in path.segments.iter().zip(spans.iter()).enumerate() {
+            segs.push(seg.clone());
+            let sub_path = ast::Path{span: *span, // span for the last segment
+                                     global: path.global,
+                                     segments: segs};
+            let qualname = if i == 0 && path.global {
+                format!("::{}", path_to_string(&sub_path))
+            } else {
+                path_to_string(&sub_path)
+            };
+            result.push((*span, qualname));
+            segs = sub_path.segments;
+        }
+
+        result
+    }
+
+    // The global arg allows us to override the global-ness of the path (which
+    // actually means 'does the path start with `::`', rather than 'is the path
+    // semantically global). We use the override for `use` imports (etc.) where
+    // the syntax is non-global, but the semantics are global.
+    fn write_sub_paths(&mut self, path: &ast::Path, global: bool) {
+        let sub_paths = self.process_path_prefixes(path);
+        for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
+            let qualname = if i == 0 && global && !path.global {
+                format!("::{}", qualname)
+            } else {
+                qualname.clone()
+            };
+            self.fmt.sub_mod_ref_str(path.span,
+                                     *span,
+                                     &qualname[..],
+                                     self.cur_scope);
+        }
+    }
+
+    // As write_sub_paths, but does not process the last ident in the path (assuming it
+    // will be processed elsewhere). See note on write_sub_paths about global.
+    fn write_sub_paths_truncated(&mut self, path: &ast::Path, global: bool) {
+        let sub_paths = self.process_path_prefixes(path);
+        let len = sub_paths.len();
+        if len <= 1 {
+            return;
+        }
+
+        let sub_paths = &sub_paths[..len-1];
+        for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
+            let qualname = if i == 0 && global && !path.global {
+                format!("::{}", qualname)
+            } else {
+                qualname.clone()
+            };
+            self.fmt.sub_mod_ref_str(path.span,
+                                     *span,
+                                     &qualname[..],
+                                     self.cur_scope);
+        }
+    }
+
+    // As write_sub_paths, but expects a path of the form module_path::trait::method
+    // Where trait could actually be a struct too.
+    fn write_sub_path_trait_truncated(&mut self, path: &ast::Path) {
+        let sub_paths = self.process_path_prefixes(path);
+        let len = sub_paths.len();
+        if len <= 1 {
+            return;
+        }
+        let sub_paths = &sub_paths[.. (len-1)];
+
+        // write the trait part of the sub-path
+        let (ref span, ref qualname) = sub_paths[len-2];
+        self.fmt.sub_type_ref_str(path.span,
+                                  *span,
+                                  &qualname[..]);
+
+        // write the other sub-paths
+        if len <= 2 {
+            return;
+        }
+        let sub_paths = &sub_paths[..len-2];
+        for &(ref span, ref qualname) in sub_paths {
+            self.fmt.sub_mod_ref_str(path.span,
+                                     *span,
+                                     &qualname[..],
+                                     self.cur_scope);
+        }
+    }
+
+    // looks up anything, not just a type
+    fn lookup_type_ref(&self, ref_id: NodeId) -> Option<DefId> {
+        if !self.analysis.ty_cx.def_map.borrow().contains_key(&ref_id) {
+            self.sess.bug(&format!("def_map has no key for {} in lookup_type_ref",
+                                  ref_id));
+        }
+        let def = self.analysis.ty_cx.def_map.borrow().get(&ref_id).unwrap().full_def();
+        match def {
+            def::DefPrimTy(_) => None,
+            _ => Some(def.def_id()),
+        }
+    }
+
+    fn lookup_def_kind(&self, ref_id: NodeId, span: Span) -> Option<recorder::Row> {
+        let def_map = self.analysis.ty_cx.def_map.borrow();
+        if !def_map.contains_key(&ref_id) {
+            self.sess.span_bug(span, &format!("def_map has no key for {} in lookup_def_kind",
+                                             ref_id));
+        }
+        let def = def_map.get(&ref_id).unwrap().full_def();
+        match def {
+            def::DefMod(_) |
+            def::DefForeignMod(_) => Some(recorder::ModRef),
+            def::DefStruct(_) => Some(recorder::StructRef),
+            def::DefTy(..) |
+            def::DefAssociatedTy(..) |
+            def::DefTrait(_) => Some(recorder::TypeRef),
+            def::DefStatic(_, _) |
+            def::DefConst(_) |
+            def::DefAssociatedConst(..) |
+            def::DefLocal(_) |
+            def::DefVariant(_, _, _) |
+            def::DefUpvar(..) => Some(recorder::VarRef),
+
+            def::DefFn(..) => Some(recorder::FnRef),
+
+            def::DefSelfTy(..) |
+            def::DefRegion(_) |
+            def::DefLabel(_) |
+            def::DefTyParam(..) |
+            def::DefUse(_) |
+            def::DefMethod(..) |
+            def::DefPrimTy(_) => {
+                self.sess.span_bug(span, &format!("lookup_def_kind for unexpected item: {:?}",
+                                                 def));
+            },
+        }
+    }
+
+    fn process_formals(&mut self, formals: &Vec<ast::Arg>, qualname: &str) {
+        for arg in formals {
+            assert!(self.collected_paths.is_empty() && !self.collecting);
+            self.collecting = true;
+            self.visit_pat(&*arg.pat);
+            self.collecting = false;
+            let span_utils = self.span.clone();
+            for &(id, ref p, _, _) in &self.collected_paths {
+                let typ =
+                    ppaux::ty_to_string(
+                        &self.analysis.ty_cx,
+                        *self.analysis.ty_cx.node_types().get(&id).unwrap());
+                // get the span only for the name of the variable (I hope the path is only ever a
+                // variable name, but who knows?)
+                self.fmt.formal_str(p.span,
+                                    span_utils.span_for_last_ident(p.span),
+                                    id,
+                                    qualname,
+                                    &path_to_string(p),
+                                    &typ[..]);
+            }
+            self.collected_paths.clear();
+        }
+    }
+
+    fn process_method(&mut self, sig: &ast::MethodSig,
+                      body: Option<&ast::Block>,
+                      id: ast::NodeId, name: ast::Name,
+                      span: Span) {
+        if generated_code(span) {
+            return;
+        }
+
+        debug!("process_method: {}:{}", id, token::get_name(name));
+
+        let mut scope_id;
+        // The qualname for a method is the trait name or name of the struct in an impl in
+        // which the method is declared in, followed by the method's name.
+        let qualname = match ty::impl_of_method(&self.analysis.ty_cx,
+                                                ast_util::local_def(id)) {
+            Some(impl_id) => match self.analysis.ty_cx.map.get(impl_id.node) {
+                NodeItem(item) => {
+                    scope_id = item.id;
+                    match item.node {
+                        ast::ItemImpl(_, _, _, _, ref ty, _) => {
+                            let mut result = String::from_str("<");
+                            result.push_str(&ty_to_string(&**ty));
+
+                            match ty::trait_of_item(&self.analysis.ty_cx,
+                                                    ast_util::local_def(id)) {
+                                Some(def_id) => {
+                                    result.push_str(" as ");
+                                    result.push_str(
+                                        &ty::item_path_str(&self.analysis.ty_cx, def_id));
+                                },
+                                None => {}
+                            }
+                            result.push_str(">");
+                            result
+                        }
+                        _ => {
+                            self.sess.span_bug(span,
+                                &format!("Container {} for method {} not an impl?",
+                                         impl_id.node, id));
+                        },
+                    }
+                },
+                _ => {
+                    self.sess.span_bug(span,
+                        &format!("Container {} for method {} is not a node item {:?}",
+                                 impl_id.node, id, self.analysis.ty_cx.map.get(impl_id.node)));
+                },
+            },
+            None => match ty::trait_of_item(&self.analysis.ty_cx,
+                                            ast_util::local_def(id)) {
+                Some(def_id) => {
+                    scope_id = def_id.node;
+                    match self.analysis.ty_cx.map.get(def_id.node) {
+                        NodeItem(_) => {
+                            format!("::{}", ty::item_path_str(&self.analysis.ty_cx, def_id))
+                        }
+                        _ => {
+                            self.sess.span_bug(span,
+                                &format!("Could not find container {} for method {}",
+                                         def_id.node, id));
+                        }
+                    }
+                },
+                None => {
+                    self.sess.span_bug(span,
+                        &format!("Could not find container for method {}", id));
+                },
+            },
+        };
+
+        let qualname = &format!("{}::{}", qualname, &token::get_name(name));
+
+        // record the decl for this def (if it has one)
+        let decl_id = ty::trait_item_of_item(&self.analysis.ty_cx,
+                                             ast_util::local_def(id))
+            .and_then(|new_id| {
+                let def_id = new_id.def_id();
+                if def_id.node != 0 && def_id != ast_util::local_def(id) {
+                    Some(def_id)
+                } else {
+                    None
+                }
+            });
+
+        let sub_span = self.span.sub_span_after_keyword(span, keywords::Fn);
+        if body.is_some() {
+            self.fmt.method_str(span,
+                                sub_span,
+                                id,
+                                qualname,
+                                decl_id,
+                                scope_id);
+            self.process_formals(&sig.decl.inputs, qualname);
+        } else {
+            self.fmt.method_decl_str(span,
+                                     sub_span,
+                                     id,
+                                     qualname,
+                                     scope_id);
+        }
+
+        // walk arg and return types
+        for arg in &sig.decl.inputs {
+            self.visit_ty(&arg.ty);
+        }
+
+        if let ast::Return(ref ret_ty) = sig.decl.output {
+            self.visit_ty(ret_ty);
+        }
+
+        // walk the fn body
+        if let Some(body) = body {
+            self.nest(id, |v| v.visit_block(body));
+        }
+
+        self.process_generic_params(&sig.generics,
+                                    span,
+                                    qualname,
+                                    id);
+    }
+
+    fn process_trait_ref(&mut self,
+                         trait_ref: &ast::TraitRef) {
+        match self.lookup_type_ref(trait_ref.ref_id) {
+            Some(id) => {
+                let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
+                self.fmt.ref_str(recorder::TypeRef,
+                                 trait_ref.path.span,
+                                 sub_span,
+                                 id,
+                                 self.cur_scope);
+                visit::walk_path(self, &trait_ref.path);
+            },
+            None => ()
+        }
+    }
+
+    fn process_struct_field_def(&mut self,
+                                field: &ast::StructField,
+                                qualname: &str,
+                                scope_id: NodeId) {
+        match field.node.kind {
+            ast::NamedField(ident, _) => {
+                let name = get_ident(ident);
+                let qualname = format!("{}::{}", qualname, name);
+                let typ =
+                    ppaux::ty_to_string(
+                        &self.analysis.ty_cx,
+                        *self.analysis.ty_cx.node_types().get(&field.node.id).unwrap());
+                match self.span.sub_span_before_token(field.span, token::Colon) {
+                    Some(sub_span) => self.fmt.field_str(field.span,
+                                                         Some(sub_span),
+                                                         field.node.id,
+                                                         &name[..],
+                                                         &qualname[..],
+                                                         &typ[..],
+                                                         scope_id),
+                    None => self.sess.span_bug(field.span,
+                                               &format!("Could not find sub-span for field {}",
+                                                       qualname)),
+                }
+            },
+            _ => (),
+        }
+    }
+
+    // Dump generic params bindings, then visit_generics
+    fn process_generic_params(&mut self,
+                              generics:&ast::Generics,
+                              full_span: Span,
+                              prefix: &str,
+                              id: NodeId) {
+        // We can't only use visit_generics since we don't have spans for param
+        // bindings, so we reparse the full_span to get those sub spans.
+        // However full span is the entire enum/fn/struct block, so we only want
+        // the first few to match the number of generics we're looking for.
+        let param_sub_spans = self.span.spans_for_ty_params(full_span,
+                                                           (generics.ty_params.len() as isize));
+        for (param, param_ss) in generics.ty_params.iter().zip(param_sub_spans.iter()) {
+            // Append $id to name to make sure each one is unique
+            let name = format!("{}::{}${}",
+                               prefix,
+                               escape(self.span.snippet(*param_ss)),
+                               id);
+            self.fmt.typedef_str(full_span,
+                                 Some(*param_ss),
+                                 param.id,
+                                 &name[..],
+                                 "");
+        }
+        self.visit_generics(generics);
+    }
+
+    fn process_fn(&mut self,
+                  item: &ast::Item,
+                  decl: &ast::FnDecl,
+                  ty_params: &ast::Generics,
+                  body: &ast::Block) {
+        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
+
+        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Fn);
+        self.fmt.fn_str(item.span,
+                        sub_span,
+                        item.id,
+                        &qualname[..],
+                        self.cur_scope);
+
+        self.process_formals(&decl.inputs, &qualname[..]);
+
+        // walk arg and return types
+        for arg in &decl.inputs {
+            self.visit_ty(&*arg.ty);
+        }
+
+        if let ast::Return(ref ret_ty) = decl.output {
+            self.visit_ty(&**ret_ty);
+        }
+
+        // walk the body
+        self.nest(item.id, |v| v.visit_block(&*body));
+
+        self.process_generic_params(ty_params, item.span, &qualname[..], item.id);
+    }
+
+    fn process_static(&mut self,
+                      item: &ast::Item,
+                      typ: &ast::Ty,
+                      mt: ast::Mutability,
+                      expr: &ast::Expr)
+    {
+        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
+
+        // If the variable is immutable, save the initialising expression.
+        let (value, keyword) = match mt {
+            ast::MutMutable => (String::from_str("<mutable>"), keywords::Mut),
+            ast::MutImmutable => (self.span.snippet(expr.span), keywords::Static),
+        };
+
+        let sub_span = self.span.sub_span_after_keyword(item.span, keyword);
+        self.fmt.static_str(item.span,
+                            sub_span,
+                            item.id,
+                            &get_ident(item.ident),
+                            &qualname[..],
+                            &value[..],
+                            &ty_to_string(&*typ),
+                            self.cur_scope);
+
+        // walk type and init value
+        self.visit_ty(&*typ);
+        self.visit_expr(expr);
+    }
+
+    fn process_const(&mut self,
+                     id: ast::NodeId,
+                     ident: &ast::Ident,
+                     span: Span,
+                     typ: &ast::Ty,
+                     expr: &ast::Expr)
+    {
+        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(id));
+
+        let sub_span = self.span.sub_span_after_keyword(span,
+                                                        keywords::Const);
+        self.fmt.static_str(span,
+                            sub_span,
+                            id,
+                            &get_ident((*ident).clone()),
+                            &qualname[..],
+                            "",
+                            &ty_to_string(&*typ),
+                            self.cur_scope);
+
+        // walk type and init value
+        self.visit_ty(typ);
+        self.visit_expr(expr);
+    }
+
+    fn process_struct(&mut self,
+                      item: &ast::Item,
+                      def: &ast::StructDef,
+                      ty_params: &ast::Generics) {
+        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
+
+        let ctor_id = match def.ctor_id {
+            Some(node_id) => node_id,
+            None => -1,
+        };
+        let val = self.span.snippet(item.span);
+        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Struct);
+        self.fmt.struct_str(item.span,
+                            sub_span,
+                            item.id,
+                            ctor_id,
+                            &qualname[..],
+                            self.cur_scope,
+                            &val[..]);
+
+        // fields
+        for field in &def.fields {
+            self.process_struct_field_def(field, &qualname[..], item.id);
+            self.visit_ty(&*field.node.ty);
+        }
+
+        self.process_generic_params(ty_params, item.span, &qualname[..], item.id);
+    }
+
+    fn process_enum(&mut self,
+                    item: &ast::Item,
+                    enum_definition: &ast::EnumDef,
+                    ty_params: &ast::Generics) {
+        let enum_name = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
+        let val = self.span.snippet(item.span);
+        match self.span.sub_span_after_keyword(item.span, keywords::Enum) {
+            Some(sub_span) => self.fmt.enum_str(item.span,
+                                                Some(sub_span),
+                                                item.id,
+                                                &enum_name[..],
+                                                self.cur_scope,
+                                                &val[..]),
+            None => self.sess.span_bug(item.span,
+                                       &format!("Could not find subspan for enum {}",
+                                               enum_name)),
+        }
+        for variant in &enum_definition.variants {
+            let name = get_ident(variant.node.name);
+            let name = &name;
+            let mut qualname = enum_name.clone();
+            qualname.push_str("::");
+            qualname.push_str(name);
+            let val = self.span.snippet(variant.span);
+            match variant.node.kind {
+                ast::TupleVariantKind(ref args) => {
+                    // first ident in span is the variant's name
+                    self.fmt.tuple_variant_str(variant.span,
+                                               self.span.span_for_first_ident(variant.span),
+                                               variant.node.id,
+                                               name,
+                                               &qualname[..],
+                                               &enum_name[..],
+                                               &val[..],
+                                               item.id);
+                    for arg in args {
+                        self.visit_ty(&*arg.ty);
+                    }
+                }
+                ast::StructVariantKind(ref struct_def) => {
+                    let ctor_id = match struct_def.ctor_id {
+                        Some(node_id) => node_id,
+                        None => -1,
+                    };
+                    self.fmt.struct_variant_str(
+                        variant.span,
+                        self.span.span_for_first_ident(variant.span),
+                        variant.node.id,
+                        ctor_id,
+                        &qualname[..],
+                        &enum_name[..],
+                        &val[..],
+                        item.id);
+
+                    for field in &struct_def.fields {
+                        self.process_struct_field_def(field, &qualname, variant.node.id);
+                        self.visit_ty(&*field.node.ty);
+                    }
+                }
+            }
+        }
+
+        self.process_generic_params(ty_params, item.span, &enum_name[..], item.id);
+    }
+
+    fn process_impl(&mut self,
+                    item: &ast::Item,
+                    type_parameters: &ast::Generics,
+                    trait_ref: &Option<ast::TraitRef>,
+                    typ: &ast::Ty,
+                    impl_items: &[P<ast::ImplItem>]) {
+        let trait_id = trait_ref.as_ref().and_then(|tr| self.lookup_type_ref(tr.ref_id));
+        match typ.node {
+            // Common case impl for a struct or something basic.
+            ast::TyPath(None, ref path) => {
+                let sub_span = self.span.sub_span_for_type_name(path.span);
+                let self_id = self.lookup_type_ref(typ.id).map(|id| {
+                    self.fmt.ref_str(recorder::TypeRef,
+                                     path.span,
+                                     sub_span,
+                                     id,
+                                     self.cur_scope);
+                    id
+                });
+                self.fmt.impl_str(path.span,
+                                  sub_span,
+                                  item.id,
+                                  self_id,
+                                  trait_id,
+                                  self.cur_scope);
+            },
+            _ => {
+                // Less useful case, impl for a compound type.
+                self.visit_ty(&*typ);
+
+                let sub_span = self.span.sub_span_for_type_name(typ.span);
+                self.fmt.impl_str(typ.span,
+                                  sub_span,
+                                  item.id,
+                                  None,
+                                  trait_id,
+                                  self.cur_scope);
+            }
+        }
+
+        match *trait_ref {
+            Some(ref trait_ref) => self.process_trait_ref(trait_ref),
+            None => (),
+        }
+
+        self.process_generic_params(type_parameters, item.span, "", item.id);
+        for impl_item in impl_items {
+            self.visit_impl_item(impl_item);
+        }
+    }
+
+    fn process_trait(&mut self,
+                     item: &ast::Item,
+                     generics: &ast::Generics,
+                     trait_refs: &OwnedSlice<ast::TyParamBound>,
+                     methods: &[P<ast::TraitItem>]) {
+        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
+        let val = self.span.snippet(item.span);
+        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Trait);
+        self.fmt.trait_str(item.span,
+                           sub_span,
+                           item.id,
+                           &qualname[..],
+                           self.cur_scope,
+                           &val[..]);
+
+        // super-traits
+        for super_bound in &**trait_refs {
+            let trait_ref = match *super_bound {
+                ast::TraitTyParamBound(ref trait_ref, _) => {
+                    trait_ref
+                }
+                ast::RegionTyParamBound(..) => {
+                    continue;
+                }
+            };
+
+            let trait_ref = &trait_ref.trait_ref;
+            match self.lookup_type_ref(trait_ref.ref_id) {
+                Some(id) => {
+                    let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
+                    self.fmt.ref_str(recorder::TypeRef,
+                                     trait_ref.path.span,
+                                     sub_span,
+                                     id,
+                                     self.cur_scope);
+                    self.fmt.inherit_str(trait_ref.path.span,
+                                         sub_span,
+                                         id,
+                                         item.id);
+                },
+                None => ()
+            }
+        }
+
+        // walk generics and methods
+        self.process_generic_params(generics, item.span, &qualname[..], item.id);
+        for method in methods {
+            self.visit_trait_item(method)
+        }
+    }
+
+    fn process_mod(&mut self,
+                   item: &ast::Item,  // The module in question, represented as an item.
+                   m: &ast::Mod) {
+        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
+
+        let cm = self.sess.codemap();
+        let filename = cm.span_to_filename(m.inner);
+
+        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Mod);
+        self.fmt.mod_str(item.span,
+                         sub_span,
+                         item.id,
+                         &qualname[..],
+                         self.cur_scope,
+                         &filename[..]);
+
+        self.nest(item.id, |v| visit::walk_mod(v, m));
+    }
+
+    fn process_path(&mut self,
+                    id: NodeId,
+                    span: Span,
+                    path: &ast::Path,
+                    ref_kind: Option<recorder::Row>) {
+        if generated_code(span) {
+            return
+        }
+
+        let def_map = self.analysis.ty_cx.def_map.borrow();
+        if !def_map.contains_key(&id) {
+            self.sess.span_bug(span,
+                               &format!("def_map has no key for {} in visit_expr", id));
+        }
+        let def = def_map.get(&id).unwrap().full_def();
+        let sub_span = self.span.span_for_last_ident(span);
+        match def {
+            def::DefUpvar(..) |
+            def::DefLocal(..) |
+            def::DefStatic(..) |
+            def::DefConst(..) |
+            def::DefAssociatedConst(..) |
+            def::DefVariant(..) => self.fmt.ref_str(ref_kind.unwrap_or(recorder::VarRef),
+                                                    span,
+                                                    sub_span,
+                                                    def.def_id(),
+                                                    self.cur_scope),
+            def::DefStruct(def_id) => self.fmt.ref_str(recorder::StructRef,
+                                                       span,
+                                                       sub_span,
+                                                       def_id,
+                                                       self.cur_scope),
+            def::DefTy(def_id, _) => self.fmt.ref_str(recorder::TypeRef,
+                                                      span,
+                                                      sub_span,
+                                                      def_id,
+                                                      self.cur_scope),
+            def::DefMethod(declid, provenence) => {
+                let sub_span = self.span.sub_span_for_meth_name(span);
+                let defid = if declid.krate == ast::LOCAL_CRATE {
+                    let ti = ty::impl_or_trait_item(&self.analysis.ty_cx,
+                                                    declid);
+                    match provenence {
+                        def::FromTrait(def_id) => {
+                            Some(ty::trait_items(&self.analysis.ty_cx,
+                                                 def_id)
+                                    .iter()
+                                    .find(|mr| {
+                                        mr.name() == ti.name()
+                                    })
+                                    .unwrap()
+                                    .def_id())
+                        }
+                        def::FromImpl(def_id) => {
+                            let impl_items = self.analysis
+                                                 .ty_cx
+                                                 .impl_items
+                                                 .borrow();
+                            Some(impl_items.get(&def_id)
+                                           .unwrap()
+                                           .iter()
+                                           .find(|mr| {
+                                                ty::impl_or_trait_item(
+                                                    &self.analysis.ty_cx,
+                                                    mr.def_id()
+                                                ).name() == ti.name()
+                                            })
+                                           .unwrap()
+                                           .def_id())
+                        }
+                    }
+                } else {
+                    None
+                };
+                self.fmt.meth_call_str(span,
+                                       sub_span,
+                                       defid,
+                                       Some(declid),
+                                       self.cur_scope);
+            },
+            def::DefFn(def_id, _) => {
+                self.fmt.fn_call_str(span,
+                                     sub_span,
+                                     def_id,
+                                     self.cur_scope)
+            }
+            _ => self.sess.span_bug(span,
+                                    &format!("Unexpected def kind while looking \
+                                              up path in `{}`: `{:?}`",
+                                             self.span.snippet(span),
+                                             def)),
+        }
+        // modules or types in the path prefix
+        match def {
+            def::DefMethod(did, _) => {
+                let ti = ty::impl_or_trait_item(&self.analysis.ty_cx, did);
+                if let ty::MethodTraitItem(m) = ti {
+                    if m.explicit_self == ty::StaticExplicitSelfCategory {
+                        self.write_sub_path_trait_truncated(path);
+                    }
+                }
+            }
+            def::DefLocal(_) |
+            def::DefStatic(_,_) |
+            def::DefConst(..) |
+            def::DefAssociatedConst(..) |
+            def::DefStruct(_) |
+            def::DefVariant(..) |
+            def::DefFn(..) => self.write_sub_paths_truncated(path, false),
+            _ => {},
+        }
+    }
+
+    fn process_struct_lit(&mut self,
+                          ex: &ast::Expr,
+                          path: &ast::Path,
+                          fields: &Vec<ast::Field>,
+                          base: &Option<P<ast::Expr>>) {
+        if generated_code(path.span) {
+            return
+        }
+
+        self.write_sub_paths_truncated(path, false);
+
+        let ty = &ty::expr_ty_adjusted(&self.analysis.ty_cx, ex).sty;
+        let struct_def = match *ty {
+            ty::ty_struct(def_id, _) => {
+                let sub_span = self.span.span_for_last_ident(path.span);
+                self.fmt.ref_str(recorder::StructRef,
+                                 path.span,
+                                 sub_span,
+                                 def_id,
+                                 self.cur_scope);
+                Some(def_id)
+            }
+            _ => None
+        };
+
+        for field in fields {
+            match struct_def {
+                Some(struct_def) => {
+                    let fields = ty::lookup_struct_fields(&self.analysis.ty_cx, struct_def);
+                    for f in &fields {
+                        if generated_code(field.ident.span) {
+                            continue;
+                        }
+                        if f.name == field.ident.node.name {
+                            // We don't really need a sub-span here, but no harm done
+                            let sub_span = self.span.span_for_last_ident(field.ident.span);
+                            self.fmt.ref_str(recorder::VarRef,
+                                             field.ident.span,
+                                             sub_span,
+                                             f.id,
+                                             self.cur_scope);
+                        }
+                    }
+                }
+                None => {}
+            }
+
+            self.visit_expr(&*field.expr)
+        }
+        visit::walk_expr_opt(self, base)
+    }
+
+    fn process_method_call(&mut self,
+                           ex: &ast::Expr,
+                           args: &Vec<P<ast::Expr>>) {
+        let method_map = self.analysis.ty_cx.method_map.borrow();
+        let method_callee = method_map.get(&ty::MethodCall::expr(ex.id)).unwrap();
+        let (def_id, decl_id) = match method_callee.origin {
+            ty::MethodStatic(def_id) |
+            ty::MethodStaticClosure(def_id) => {
+                // method invoked on an object with a concrete type (not a static method)
+                let decl_id =
+                    match ty::trait_item_of_item(&self.analysis.ty_cx,
+                                                 def_id) {
+                        None => None,
+                        Some(decl_id) => Some(decl_id.def_id()),
+                    };
+
+                // This incantation is required if the method referenced is a
+                // trait's default implementation.
+                let def_id = match ty::impl_or_trait_item(&self.analysis
+                                                               .ty_cx,
+                                                          def_id) {
+                    ty::MethodTraitItem(method) => {
+                        method.provided_source.unwrap_or(def_id)
+                    }
+                    _ => self.sess
+                             .span_bug(ex.span,
+                                       "save::process_method_call: non-method \
+                                        DefId in MethodStatic or MethodStaticClosure"),
+                };
+                (Some(def_id), decl_id)
+            }
+            ty::MethodTypeParam(ref mp) => {
+                // method invoked on a type parameter
+                let trait_item = ty::trait_item(&self.analysis.ty_cx,
+                                                mp.trait_ref.def_id,
+                                                mp.method_num);
+                (None, Some(trait_item.def_id()))
+            }
+            ty::MethodTraitObject(ref mo) => {
+                // method invoked on a trait instance
+                let trait_item = ty::trait_item(&self.analysis.ty_cx,
+                                                mo.trait_ref.def_id,
+                                                mo.method_num);
+                (None, Some(trait_item.def_id()))
+            }
+        };
+        let sub_span = self.span.sub_span_for_meth_name(ex.span);
+        self.fmt.meth_call_str(ex.span,
+                               sub_span,
+                               def_id,
+                               decl_id,
+                               self.cur_scope);
+
+        // walk receiver and args
+        visit::walk_exprs(self, &args[..]);
+    }
+
+    fn process_pat(&mut self, p:&ast::Pat) {
+        if generated_code(p.span) {
+            return
+        }
+
+        match p.node {
+            ast::PatStruct(ref path, ref fields, _) => {
+                self.collected_paths.push((p.id, path.clone(), false, recorder::StructRef));
+                visit::walk_path(self, path);
+
+                let def = self.analysis.ty_cx.def_map.borrow().get(&p.id).unwrap().full_def();
+                let struct_def = match def {
+                    def::DefConst(..) | def::DefAssociatedConst(..) => None,
+                    def::DefVariant(_, variant_id, _) => Some(variant_id),
+                    _ => {
+                        match ty::ty_to_def_id(ty::node_id_to_type(&self.analysis.ty_cx, p.id)) {
+                            None => {
+                                self.sess.span_bug(p.span,
+                                                   &format!("Could not find struct_def for `{}`",
+                                                            self.span.snippet(p.span)));
+                            }
+                            Some(def_id) => Some(def_id),
+                        }
+                    }
+                };
+
+                if let Some(struct_def) = struct_def {
+                    let struct_fields = ty::lookup_struct_fields(&self.analysis.ty_cx, struct_def);
+                    for &Spanned { node: ref field, span } in fields {
+                        let sub_span = self.span.span_for_first_ident(span);
+                        for f in &struct_fields {
+                            if f.name == field.ident.name {
+                                self.fmt.ref_str(recorder::VarRef,
+                                                 span,
+                                                 sub_span,
+                                                 f.id,
+                                                 self.cur_scope);
+                                break;
+                            }
+                        }
+                        self.visit_pat(&*field.pat);
+                    }
+                }
+            }
+            ast::PatEnum(ref path, _) |
+            ast::PatQPath(_, ref path) => {
+                self.collected_paths.push((p.id, path.clone(), false, recorder::VarRef));
+                visit::walk_pat(self, p);
+            }
+            ast::PatIdent(bm, ref path1, ref optional_subpattern) => {
+                let immut = match bm {
+                    // Even if the ref is mut, you can't change the ref, only
+                    // the data pointed at, so showing the initialising expression
+                    // is still worthwhile.
+                    ast::BindByRef(_) => true,
+                    ast::BindByValue(mt) => {
+                        match mt {
+                            ast::MutMutable => false,
+                            ast::MutImmutable => true,
+                        }
+                    }
+                };
+                // collect path for either visit_local or visit_arm
+                let path = ast_util::ident_to_path(path1.span,path1.node);
+                self.collected_paths.push((p.id, path, immut, recorder::VarRef));
+                match *optional_subpattern {
+                    None => {}
+                    Some(ref subpattern) => self.visit_pat(&**subpattern)
+                }
+            }
+            _ => visit::walk_pat(self, p)
+        }
+    }
+}
+
+impl<'l, 'tcx, 'v> Visitor<'v> for DumpCsvVisitor<'l, 'tcx> {
+    fn visit_item(&mut self, item: &ast::Item) {
+        if generated_code(item.span) {
+            return
+        }
+
+        match item.node {
+            ast::ItemUse(ref use_item) => {
+                match use_item.node {
+                    ast::ViewPathSimple(ident, ref path) => {
+                        let sub_span = self.span.span_for_last_ident(path.span);
+                        let mod_id = match self.lookup_type_ref(item.id) {
+                            Some(def_id) => {
+                                match self.lookup_def_kind(item.id, path.span) {
+                                    Some(kind) => self.fmt.ref_str(kind,
+                                                                   path.span,
+                                                                   sub_span,
+                                                                   def_id,
+                                                                   self.cur_scope),
+                                    None => {},
+                                }
+                                Some(def_id)
+                            },
+                            None => None,
+                        };
+
+                        // 'use' always introduces an alias, if there is not an explicit
+                        // one, there is an implicit one.
+                        let sub_span =
+                            match self.span.sub_span_after_keyword(use_item.span, keywords::As) {
+                                Some(sub_span) => Some(sub_span),
+                                None => sub_span,
+                            };
+
+                        self.fmt.use_alias_str(path.span,
+                                               sub_span,
+                                               item.id,
+                                               mod_id,
+                                               &get_ident(ident),
+                                               self.cur_scope);
+                        self.write_sub_paths_truncated(path, true);
+                    }
+                    ast::ViewPathGlob(ref path) => {
+                        // Make a comma-separated list of names of imported modules.
+                        let mut name_string = String::new();
+                        let glob_map = &self.analysis.glob_map;
+                        let glob_map = glob_map.as_ref().unwrap();
+                        if glob_map.contains_key(&item.id) {
+                            for n in glob_map.get(&item.id).unwrap() {
+                                if !name_string.is_empty() {
+                                    name_string.push_str(", ");
+                                }
+                                name_string.push_str(n.as_str());
+                            }
+                        }
+
+                        let sub_span = self.span.sub_span_of_token(path.span,
+                                                                   token::BinOp(token::Star));
+                        self.fmt.use_glob_str(path.span,
+                                              sub_span,
+                                              item.id,
+                                              &name_string,
+                                              self.cur_scope);
+                        self.write_sub_paths(path, true);
+                    }
+                    ast::ViewPathList(ref path, ref list) => {
+                        for plid in list {
+                            match plid.node {
+                                ast::PathListIdent { id, .. } => {
+                                    match self.lookup_type_ref(id) {
+                                        Some(def_id) =>
+                                            match self.lookup_def_kind(id, plid.span) {
+                                                Some(kind) => {
+                                                    self.fmt.ref_str(
+                                                        kind, plid.span,
+                                                        Some(plid.span),
+                                                        def_id, self.cur_scope);
+                                                }
+                                                None => ()
+                                            },
+                                        None => ()
+                                    }
+                                },
+                                ast::PathListMod { .. } => ()
+                            }
+                        }
+
+                        self.write_sub_paths(path, true);
+                    }
+                }
+            }
+            ast::ItemExternCrate(ref s) => {
+                let name = get_ident(item.ident);
+                let name = &name;
+                let location = match *s {
+                    Some(s) => s.to_string(),
+                    None => name.to_string(),
+                };
+                let alias_span = self.span.span_for_last_ident(item.span);
+                let cnum = match self.sess.cstore.find_extern_mod_stmt_cnum(item.id) {
+                    Some(cnum) => cnum,
+                    None => 0,
+                };
+                self.fmt.extern_crate_str(item.span,
+                                          alias_span,
+                                          item.id,
+                                          cnum,
+                                          name,
+                                          &location[..],
+                                          self.cur_scope);
+            }
+            ast::ItemFn(ref decl, _, _, ref ty_params, ref body) =>
+                self.process_fn(item, &**decl, ty_params, &**body),
+            ast::ItemStatic(ref typ, mt, ref expr) =>
+                self.process_static(item, &**typ, mt, &**expr),
+            ast::ItemConst(ref typ, ref expr) =>
+                self.process_const(item.id, &item.ident, item.span, &*typ, &*expr),
+            ast::ItemStruct(ref def, ref ty_params) => self.process_struct(item, &**def, ty_params),
+            ast::ItemEnum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
+            ast::ItemImpl(_, _,
+                          ref ty_params,
+                          ref trait_ref,
+                          ref typ,
+                          ref impl_items) => {
+                self.process_impl(item,
+                                  ty_params,
+                                  trait_ref,
+                                  &**typ,
+                                  impl_items)
+            }
+            ast::ItemTrait(_, ref generics, ref trait_refs, ref methods) =>
+                self.process_trait(item, generics, trait_refs, methods),
+            ast::ItemMod(ref m) => self.process_mod(item, m),
+            ast::ItemTy(ref ty, ref ty_params) => {
+                let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
+                let value = ty_to_string(&**ty);
+                let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Type);
+                self.fmt.typedef_str(item.span,
+                                     sub_span,
+                                     item.id,
+                                     &qualname[..],
+                                     &value[..]);
+
+                self.visit_ty(&**ty);
+                self.process_generic_params(ty_params, item.span, &qualname, item.id);
+            },
+            ast::ItemMac(_) => (),
+            _ => visit::walk_item(self, item),
+        }
+    }
+
+    fn visit_generics(&mut self, generics: &ast::Generics) {
+        for param in &*generics.ty_params {
+            for bound in &*param.bounds {
+                if let ast::TraitTyParamBound(ref trait_ref, _) = *bound {
+                    self.process_trait_ref(&trait_ref.trait_ref);
+                }
+            }
+            if let Some(ref ty) = param.default {
+                self.visit_ty(&**ty);
+            }
+        }
+    }
+
+    fn visit_trait_item(&mut self, trait_item: &ast::TraitItem) {
+        match trait_item.node {
+            ast::ConstTraitItem(ref ty, Some(ref expr)) => {
+                self.process_const(trait_item.id, &trait_item.ident,
+                                   trait_item.span, &*ty, &*expr);
+            }
+            ast::MethodTraitItem(ref sig, ref body) => {
+                self.process_method(sig, body.as_ref().map(|x| &**x),
+                                    trait_item.id, trait_item.ident.name, trait_item.span);
+            }
+            ast::ConstTraitItem(_, None) |
+            ast::TypeTraitItem(..) => {}
+        }
+    }
+
+    fn visit_impl_item(&mut self, impl_item: &ast::ImplItem) {
+        match impl_item.node {
+            ast::ConstImplItem(ref ty, ref expr) => {
+                self.process_const(impl_item.id, &impl_item.ident,
+                                   impl_item.span, &ty, &expr);
+            }
+            ast::MethodImplItem(ref sig, ref body) => {
+                self.process_method(sig, Some(body), impl_item.id,
+                                    impl_item.ident.name, impl_item.span);
+            }
+            ast::TypeImplItem(_) |
+            ast::MacImplItem(_) => {}
+        }
+    }
+
+    fn visit_ty(&mut self, t: &ast::Ty) {
+        if generated_code(t.span) {
+            return
+        }
+
+        match t.node {
+            ast::TyPath(_, ref path) => {
+                match self.lookup_type_ref(t.id) {
+                    Some(id) => {
+                        let sub_span = self.span.sub_span_for_type_name(t.span);
+                        self.fmt.ref_str(recorder::TypeRef,
+                                         t.span,
+                                         sub_span,
+                                         id,
+                                         self.cur_scope);
+                    },
+                    None => ()
+                }
+
+                self.write_sub_paths_truncated(path, false);
+
+                visit::walk_path(self, path);
+            },
+            _ => visit::walk_ty(self, t),
+        }
+    }
+
+    fn visit_expr(&mut self, ex: &ast::Expr) {
+        if generated_code(ex.span) {
+            return
+        }
+
+        match ex.node {
+            ast::ExprCall(ref _f, ref _args) => {
+                // Don't need to do anything for function calls,
+                // because just walking the callee path does what we want.
+                visit::walk_expr(self, ex);
+            }
+            ast::ExprPath(_, ref path) => {
+                self.process_path(ex.id, path.span, path, None);
+                visit::walk_expr(self, ex);
+            }
+            ast::ExprStruct(ref path, ref fields, ref base) =>
+                self.process_struct_lit(ex, path, fields, base),
+            ast::ExprMethodCall(_, _, ref args) => self.process_method_call(ex, args),
+            ast::ExprField(ref sub_ex, ident) => {
+                if generated_code(sub_ex.span) {
+                    return
+                }
+
+                self.visit_expr(&**sub_ex);
+                let ty = &ty::expr_ty_adjusted(&self.analysis.ty_cx, &**sub_ex).sty;
+                match *ty {
+                    ty::ty_struct(def_id, _) => {
+                        let fields = ty::lookup_struct_fields(&self.analysis.ty_cx, def_id);
+                        for f in &fields {
+                            if f.name == ident.node.name {
+                                let sub_span = self.span.span_for_last_ident(ex.span);
+                                self.fmt.ref_str(recorder::VarRef,
+                                                 ex.span,
+                                                 sub_span,
+                                                 f.id,
+                                                 self.cur_scope);
+                                break;
+                            }
+                        }
+                    }
+                    _ => self.sess.span_bug(ex.span,
+                                            &format!("Expected struct type, found {:?}", ty)),
+                }
+            },
+            ast::ExprTupField(ref sub_ex, idx) => {
+                if generated_code(sub_ex.span) {
+                    return
+                }
+
+                self.visit_expr(&**sub_ex);
+
+                let ty = &ty::expr_ty_adjusted(&self.analysis.ty_cx, &**sub_ex).sty;
+                match *ty {
+                    ty::ty_struct(def_id, _) => {
+                        let fields = ty::lookup_struct_fields(&self.analysis.ty_cx, def_id);
+                        for (i, f) in fields.iter().enumerate() {
+                            if i == idx.node {
+                                let sub_span = self.span.sub_span_after_token(ex.span, token::Dot);
+                                self.fmt.ref_str(recorder::VarRef,
+                                                 ex.span,
+                                                 sub_span,
+                                                 f.id,
+                                                 self.cur_scope);
+                                break;
+                            }
+                        }
+                    }
+                    ty::ty_tup(_) => {}
+                    _ => self.sess.span_bug(ex.span,
+                                            &format!("Expected struct or tuple \
+                                                      type, found {:?}", ty)),
+                }
+            },
+            ast::ExprClosure(_, ref decl, ref body) => {
+                if generated_code(body.span) {
+                    return
+                }
+
+                let mut id = String::from_str("$");
+                id.push_str(&ex.id.to_string());
+                self.process_formals(&decl.inputs, &id[..]);
+
+                // walk arg and return types
+                for arg in &decl.inputs {
+                    self.visit_ty(&*arg.ty);
+                }
+
+                if let ast::Return(ref ret_ty) = decl.output {
+                    self.visit_ty(&**ret_ty);
+                }
+
+                // walk the body
+                self.nest(ex.id, |v| v.visit_block(&**body));
+            },
+            _ => {
+                visit::walk_expr(self, ex)
+            },
+        }
+    }
+
+    fn visit_mac(&mut self, _: &ast::Mac) {
+        // Just stop, macros are poison to us.
+    }
+
+    fn visit_pat(&mut self, p: &ast::Pat) {
+        self.process_pat(p);
+        if !self.collecting {
+            self.collected_paths.clear();
+        }
+    }
+
+    fn visit_arm(&mut self, arm: &ast::Arm) {
+        assert!(self.collected_paths.is_empty() && !self.collecting);
+        self.collecting = true;
+        for pattern in &arm.pats {
+            // collect paths from the arm's patterns
+            self.visit_pat(&**pattern);
+        }
+
+        // This is to get around borrow checking, because we need mut self to call process_path.
+        let mut paths_to_process = vec![];
+        // process collected paths
+        for &(id, ref p, ref immut, ref_kind) in &self.collected_paths {
+            let def_map = self.analysis.ty_cx.def_map.borrow();
+            if !def_map.contains_key(&id) {
+                self.sess.span_bug(p.span,
+                                   &format!("def_map has no key for {} in visit_arm",
+                                           id));
+            }
+            let def = def_map.get(&id).unwrap().full_def();
+            match def {
+                def::DefLocal(id)  => {
+                    let value = if *immut {
+                        self.span.snippet(p.span).to_string()
+                    } else {
+                        "<mutable>".to_string()
+                    };
+
+                    assert!(p.segments.len() == 1, "qualified path for local variable def in arm");
+                    self.fmt.variable_str(p.span,
+                                          Some(p.span),
+                                          id,
+                                          &path_to_string(p),
+                                          &value[..],
+                                          "")
+                }
+                def::DefVariant(..) | def::DefTy(..) | def::DefStruct(..) => {
+                    paths_to_process.push((id, p.clone(), Some(ref_kind)))
+                }
+                // FIXME(nrc) what are these doing here?
+                def::DefStatic(_, _) |
+                def::DefConst(..) |
+                def::DefAssociatedConst(..) => {}
+                _ => error!("unexpected definition kind when processing collected paths: {:?}",
+                            def)
+            }
+        }
+        for &(id, ref path, ref_kind) in &paths_to_process {
+            self.process_path(id, path.span, path, ref_kind);
+        }
+        self.collecting = false;
+        self.collected_paths.clear();
+        visit::walk_expr_opt(self, &arm.guard);
+        self.visit_expr(&*arm.body);
+    }
+
+    fn visit_stmt(&mut self, s: &ast::Stmt) {
+        if generated_code(s.span) {
+            return
+        }
+
+        visit::walk_stmt(self, s)
+    }
+
+    fn visit_local(&mut self, l: &ast::Local) {
+        if generated_code(l.span) {
+            return
+        }
+
+        // The local could declare multiple new vars, we must walk the
+        // pattern and collect them all.
+        assert!(self.collected_paths.is_empty() && !self.collecting);
+        self.collecting = true;
+        self.visit_pat(&*l.pat);
+        self.collecting = false;
+
+        let value = self.span.snippet(l.span);
+
+        for &(id, ref p, ref immut, _) in &self.collected_paths {
+            let value = if *immut { value.to_string() } else { "<mutable>".to_string() };
+            let types = self.analysis.ty_cx.node_types();
+            let typ = ppaux::ty_to_string(&self.analysis.ty_cx, *types.get(&id).unwrap());
+            // Get the span only for the name of the variable (I hope the path
+            // is only ever a variable name, but who knows?).
+            let sub_span = self.span.span_for_last_ident(p.span);
+            // Rust uses the id of the pattern for var lookups, so we'll use it too.
+            self.fmt.variable_str(p.span,
+                                  sub_span,
+                                  id,
+                                  &path_to_string(p),
+                                  &value[..],
+                                  &typ[..]);
+        }
+        self.collected_paths.clear();
+
+        // Just walk the initialiser and type (don't want to walk the pattern again).
+        visit::walk_ty_opt(self, &l.ty);
+        visit::walk_expr_opt(self, &l.init);
+    }
+}

src/librustc_trans/save/mod.rs

-// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
@@ -8,1506 +8,20 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Output a CSV file containing the output from rustc's analysis. The data is
-//! primarily designed to be used as input to the DXR tool, specifically its
-//! Rust plugin. It could also be used by IDEs or other code browsing, search, or
-//! cross-referencing tools.
-//!
-//! Dumping the analysis is implemented by walking the AST and getting a bunch of
-//! info out from all over the place. We use Def IDs to identify objects. The
-//! tricky part is getting syntactic (span, source text) and semantic (reference
-//! Def IDs) information for parts of expressions which the compiler has discarded.
-//! E.g., in a path `foo::bar::baz`, the compiler only keeps a span for the whole
-//! path and a reference to `baz`, but we want spans and references for all three
-//! idents.
-//!
-//! SpanUtils is used to manipulate spans. In particular, to extract sub-spans
-//! from spans (e.g., the span for `bar` from the above example path).
-//! Recorder is used for recording the output in csv format. FmtStrs separates
-//! the format of the output away from extracting it from the compiler.
-//! DxrVisitor walks the AST and processes it.
-
 use session::Session;
+use middle::ty;
 
-use middle::def;
-use middle::ty::{self, Ty};
-
-use std::cell::Cell;
 use std::env;
 use std::fs::{self, File};
 use std::path::{Path, PathBuf};
 
-use syntax::ast_util;
-use syntax::ast::{self, NodeId, DefId};
-use syntax::ast_map::NodeItem;
-use syntax::attr;
+use syntax::{ast, attr, visit};
 use syntax::codemap::*;
-use syntax::parse::token::{self, get_ident, keywords};
-use syntax::owned_slice::OwnedSlice;
-use syntax::visit::{self, Visitor};
-use syntax::print::pprust::{path_to_string, ty_to_string};
-use syntax::ptr::P;
-
-use self::span_utils::SpanUtils;
-use self::recorder::{Recorder, FmtStrs};
-
-use util::ppaux;
 
 mod span_utils;
 mod recorder;
 
-// Helper function to escape quotes in a string
-fn escape(s: String) -> String {
-    s.replace("\"", "\"\"")
-}
-
-// If the expression is a macro expansion or other generated code, run screaming and don't index.
-fn generated_code(span: Span) -> bool {
-    span.expn_id != NO_EXPANSION || span  == DUMMY_SP
-}
-
-struct DxrVisitor<'l, 'tcx: 'l> {
-    sess: &'l Session,
-    analysis: &'l ty::CrateAnalysis<'tcx>,
-
-    collected_paths: Vec<(NodeId, ast::Path, bool, recorder::Row)>,
-    collecting: bool,
-
-    span: SpanUtils<'l>,
-    fmt: FmtStrs<'l>,
-
-    cur_scope: NodeId
-}
-
-impl <'l, 'tcx> DxrVisitor<'l, 'tcx> {
-    fn nest<F>(&mut self, scope_id: NodeId, f: F) where
-        F: FnOnce(&mut DxrVisitor<'l, 'tcx>),
-    {
-        let parent_scope = self.cur_scope;
-        self.cur_scope = scope_id;
-        f(self);
-        self.cur_scope = parent_scope;
-    }
-
-    fn dump_crate_info(&mut self, name: &str, krate: &ast::Crate) {
-        // the current crate
-        self.fmt.crate_str(krate.span, name);
-
-        // dump info about all the external crates referenced from this crate
-        self.sess.cstore.iter_crate_data(|n, cmd| {
-            self.fmt.external_crate_str(krate.span, &cmd.name, n);
-        });
-        self.fmt.recorder.record("end_external_crates\n");
-    }
-
-    // Return all non-empty prefixes of a path.
-    // For each prefix, we return the span for the last segment in the prefix and
-    // a str representation of the entire prefix.
-    fn process_path_prefixes(&self, path: &ast::Path) -> Vec<(Span, String)> {
-        let spans = self.span.spans_for_path_segments(path);
-
-        // Paths to enums seem to not match their spans - the span includes all the
-        // variants too. But they seem to always be at the end, so I hope we can cope with
-        // always using the first ones. So, only error out if we don't have enough spans.
-        // What could go wrong...?
-        if spans.len() < path.segments.len() {
-            error!("Mis-calculated spans for path '{}'. \
-                    Found {} spans, expected {}. Found spans:",
-                   path_to_string(path), spans.len(), path.segments.len());
-            for s in &spans {
-                let loc = self.sess.codemap().lookup_char_pos(s.lo);
-                error!("    '{}' in {}, line {}",
-                       self.span.snippet(*s), loc.file.name, loc.line);
-            }
-            return vec!();
-        }
-
-        let mut result: Vec<(Span, String)> = vec!();
-
-        let mut segs = vec!();
-        for (i, (seg, span)) in path.segments.iter().zip(spans.iter()).enumerate() {
-            segs.push(seg.clone());
-            let sub_path = ast::Path{span: *span, // span for the last segment
-                                     global: path.global,
-                                     segments: segs};
-            let qualname = if i == 0 && path.global {
-                format!("::{}", path_to_string(&sub_path))
-            } else {
-                path_to_string(&sub_path)
-            };
-            result.push((*span, qualname));
-            segs = sub_path.segments;
-        }
-
-        result
-    }
-
-    // The global arg allows us to override the global-ness of the path (which
-    // actually means 'does the path start with `::`', rather than 'is the path
-    // semantically global). We use the override for `use` imports (etc.) where
-    // the syntax is non-global, but the semantics are global.
-    fn write_sub_paths(&mut self, path: &ast::Path, global: bool) {
-        let sub_paths = self.process_path_prefixes(path);
-        for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
-            let qualname = if i == 0 && global && !path.global {
-                format!("::{}", qualname)
-            } else {
-                qualname.clone()
-            };
-            self.fmt.sub_mod_ref_str(path.span,
-                                     *span,
-                                     &qualname[..],
-                                     self.cur_scope);
-        }
-    }
-
-    // As write_sub_paths, but does not process the last ident in the path (assuming it
-    // will be processed elsewhere). See note on write_sub_paths about global.
-    fn write_sub_paths_truncated(&mut self, path: &ast::Path, global: bool) {
-        let sub_paths = self.process_path_prefixes(path);
-        let len = sub_paths.len();
-        if len <= 1 {
-            return;
-        }
-
-        let sub_paths = &sub_paths[..len-1];
-        for (i, &(ref span, ref qualname)) in sub_paths.iter().enumerate() {
-            let qualname = if i == 0 && global && !path.global {
-                format!("::{}", qualname)
-            } else {
-                qualname.clone()
-            };
-            self.fmt.sub_mod_ref_str(path.span,
-                                     *span,
-                                     &qualname[..],
-                                     self.cur_scope);
-        }
-    }
-
-    // As write_sub_paths, but expects a path of the form module_path::trait::method
-    // Where trait could actually be a struct too.
-    fn write_sub_path_trait_truncated(&mut self, path: &ast::Path) {
-        let sub_paths = self.process_path_prefixes(path);
-        let len = sub_paths.len();
-        if len <= 1 {
-            return;
-        }
-        let sub_paths = &sub_paths[.. (len-1)];
-
-        // write the trait part of the sub-path
-        let (ref span, ref qualname) = sub_paths[len-2];
-        self.fmt.sub_type_ref_str(path.span,
-                                  *span,
-                                  &qualname[..]);
-
-        // write the other sub-paths
-        if len <= 2 {
-            return;
-        }
-        let sub_paths = &sub_paths[..len-2];
-        for &(ref span, ref qualname) in sub_paths {
-            self.fmt.sub_mod_ref_str(path.span,
-                                     *span,
-                                     &qualname[..],
-                                     self.cur_scope);
-        }
-    }
-
-    // looks up anything, not just a type
-    fn lookup_type_ref(&self, ref_id: NodeId) -> Option<DefId> {
-        if !self.analysis.ty_cx.def_map.borrow().contains_key(&ref_id) {
-            self.sess.bug(&format!("def_map has no key for {} in lookup_type_ref",
-                                  ref_id));
-        }
-        let def = self.analysis.ty_cx.def_map.borrow().get(&ref_id).unwrap().full_def();
-        match def {
-            def::DefPrimTy(_) => None,
-            _ => Some(def.def_id()),
-        }
-    }
-
-    fn lookup_def_kind(&self, ref_id: NodeId, span: Span) -> Option<recorder::Row> {
-        let def_map = self.analysis.ty_cx.def_map.borrow();
-        if !def_map.contains_key(&ref_id) {
-            self.sess.span_bug(span, &format!("def_map has no key for {} in lookup_def_kind",
-                                             ref_id));
-        }
-        let def = def_map.get(&ref_id).unwrap().full_def();
-        match def {
-            def::DefMod(_) |
-            def::DefForeignMod(_) => Some(recorder::ModRef),
-            def::DefStruct(_) => Some(recorder::StructRef),
-            def::DefTy(..) |
-            def::DefAssociatedTy(..) |
-            def::DefTrait(_) => Some(recorder::TypeRef),
-            def::DefStatic(_, _) |
-            def::DefConst(_) |
-            def::DefAssociatedConst(..) |
-            def::DefLocal(_) |
-            def::DefVariant(_, _, _) |
-            def::DefUpvar(..) => Some(recorder::VarRef),
-
-            def::DefFn(..) => Some(recorder::FnRef),
-
-            def::DefSelfTy(..) |
-            def::DefRegion(_) |
-            def::DefLabel(_) |
-            def::DefTyParam(..) |
-            def::DefUse(_) |
-            def::DefMethod(..) |
-            def::DefPrimTy(_) => {
-                self.sess.span_bug(span, &format!("lookup_def_kind for unexpected item: {:?}",
-                                                 def));
-            },
-        }
-    }
-
-    fn process_formals(&mut self, formals: &Vec<ast::Arg>, qualname: &str) {
-        for arg in formals {
-            assert!(self.collected_paths.is_empty() && !self.collecting);
-            self.collecting = true;
-            self.visit_pat(&*arg.pat);
-            self.collecting = false;
-            let span_utils = self.span.clone();
-            for &(id, ref p, _, _) in &self.collected_paths {
-                let typ =
-                    ppaux::ty_to_string(
-                        &self.analysis.ty_cx,
-                        *self.analysis.ty_cx.node_types().get(&id).unwrap());
-                // get the span only for the name of the variable (I hope the path is only ever a
-                // variable name, but who knows?)
-                self.fmt.formal_str(p.span,
-                                    span_utils.span_for_last_ident(p.span),
-                                    id,
-                                    qualname,
-                                    &path_to_string(p),
-                                    &typ[..]);
-            }
-            self.collected_paths.clear();
-        }
-    }
-
-    fn process_method(&mut self, sig: &ast::MethodSig,
-                      body: Option<&ast::Block>,
-                      id: ast::NodeId, name: ast::Name,
-                      span: Span) {
-        if generated_code(span) {
-            return;
-        }
-
-        debug!("process_method: {}:{}", id, token::get_name(name));
-
-        let mut scope_id;
-        // The qualname for a method is the trait name or name of the struct in an impl in
-        // which the method is declared in, followed by the method's name.
-        let qualname = match ty::impl_of_method(&self.analysis.ty_cx,
-                                                ast_util::local_def(id)) {
-            Some(impl_id) => match self.analysis.ty_cx.map.get(impl_id.node) {
-                NodeItem(item) => {
-                    scope_id = item.id;
-                    match item.node {
-                        ast::ItemImpl(_, _, _, _, ref ty, _) => {
-                            let mut result = String::from_str("<");
-                            result.push_str(&ty_to_string(&**ty));
-
-                            match ty::trait_of_item(&self.analysis.ty_cx,
-                                                    ast_util::local_def(id)) {
-                                Some(def_id) => {
-                                    result.push_str(" as ");
-                                    result.push_str(
-                                        &ty::item_path_str(&self.analysis.ty_cx, def_id));
-                                },
-                                None => {}
-                            }
-                            result.push_str(">");
-                            result
-                        }
-                        _ => {
-                            self.sess.span_bug(span,
-                                &format!("Container {} for method {} not an impl?",
-                                         impl_id.node, id));
-                        },
-                    }
-                },
-                _ => {
-                    self.sess.span_bug(span,
-                        &format!("Container {} for method {} is not a node item {:?}",
-                                 impl_id.node, id, self.analysis.ty_cx.map.get(impl_id.node)));
-                },
-            },
-            None => match ty::trait_of_item(&self.analysis.ty_cx,
-                                            ast_util::local_def(id)) {
-                Some(def_id) => {
-                    scope_id = def_id.node;
-                    match self.analysis.ty_cx.map.get(def_id.node) {
-                        NodeItem(_) => {
-                            format!("::{}", ty::item_path_str(&self.analysis.ty_cx, def_id))
-                        }
-                        _ => {
-                            self.sess.span_bug(span,
-                                &format!("Could not find container {} for method {}",
-                                         def_id.node, id));
-                        }
-                    }
-                },
-                None => {
-                    self.sess.span_bug(span,
-                        &format!("Could not find container for method {}", id));
-                },
-            },
-        };
-
-        let qualname = &format!("{}::{}", qualname, &token::get_name(name));
-
-        // record the decl for this def (if it has one)
-        let decl_id = ty::trait_item_of_item(&self.analysis.ty_cx,
-                                             ast_util::local_def(id))
-            .and_then(|new_id| {
-                let def_id = new_id.def_id();
-                if def_id.node != 0 && def_id != ast_util::local_def(id) {
-                    Some(def_id)
-                } else {
-                    None
-                }
-            });
-
-        let sub_span = self.span.sub_span_after_keyword(span, keywords::Fn);
-        if body.is_some() {
-            self.fmt.method_str(span,
-                                sub_span,
-                                id,
-                                qualname,
-                                decl_id,
-                                scope_id);
-            self.process_formals(&sig.decl.inputs, qualname);
-        } else {
-            self.fmt.method_decl_str(span,
-                                     sub_span,
-                                     id,
-                                     qualname,
-                                     scope_id);
-        }
-
-        // walk arg and return types
-        for arg in &sig.decl.inputs {
-            self.visit_ty(&arg.ty);
-        }
-
-        if let ast::Return(ref ret_ty) = sig.decl.output {
-            self.visit_ty(ret_ty);
-        }
-
-        // walk the fn body
-        if let Some(body) = body {
-            self.nest(id, |v| v.visit_block(body));
-        }
-
-        self.process_generic_params(&sig.generics,
-                                    span,
-                                    qualname,
-                                    id);
-    }
-
-    fn process_trait_ref(&mut self,
-                         trait_ref: &ast::TraitRef) {
-        match self.lookup_type_ref(trait_ref.ref_id) {
-            Some(id) => {
-                let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
-                self.fmt.ref_str(recorder::TypeRef,
-                                 trait_ref.path.span,
-                                 sub_span,
-                                 id,
-                                 self.cur_scope);
-                visit::walk_path(self, &trait_ref.path);
-            },
-            None => ()
-        }
-    }
-
-    fn process_struct_field_def(&mut self,
-                                field: &ast::StructField,
-                                qualname: &str,
-                                scope_id: NodeId) {
-        match field.node.kind {
-            ast::NamedField(ident, _) => {
-                let name = get_ident(ident);
-                let qualname = format!("{}::{}", qualname, name);
-                let typ =
-                    ppaux::ty_to_string(
-                        &self.analysis.ty_cx,
-                        *self.analysis.ty_cx.node_types().get(&field.node.id).unwrap());
-                match self.span.sub_span_before_token(field.span, token::Colon) {
-                    Some(sub_span) => self.fmt.field_str(field.span,
-                                                         Some(sub_span),
-                                                         field.node.id,
-                                                         &name[..],
-                                                         &qualname[..],
-                                                         &typ[..],
-                                                         scope_id),
-                    None => self.sess.span_bug(field.span,
-                                               &format!("Could not find sub-span for field {}",
-                                                       qualname)),
-                }
-            },
-            _ => (),
-        }
-    }
-
-    // Dump generic params bindings, then visit_generics
-    fn process_generic_params(&mut self,
-                              generics:&ast::Generics,
-                              full_span: Span,
-                              prefix: &str,
-                              id: NodeId) {
-        // We can't only use visit_generics since we don't have spans for param
-        // bindings, so we reparse the full_span to get those sub spans.
-        // However full span is the entire enum/fn/struct block, so we only want
-        // the first few to match the number of generics we're looking for.
-        let param_sub_spans = self.span.spans_for_ty_params(full_span,
-                                                           (generics.ty_params.len() as isize));
-        for (param, param_ss) in generics.ty_params.iter().zip(param_sub_spans.iter()) {
-            // Append $id to name to make sure each one is unique
-            let name = format!("{}::{}${}",
-                               prefix,
-                               escape(self.span.snippet(*param_ss)),
-                               id);
-            self.fmt.typedef_str(full_span,
-                                 Some(*param_ss),
-                                 param.id,
-                                 &name[..],
-                                 "");
-        }
-        self.visit_generics(generics);
-    }
-
-    fn process_fn(&mut self,
-                  item: &ast::Item,
-                  decl: &ast::FnDecl,
-                  ty_params: &ast::Generics,
-                  body: &ast::Block) {
-        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
-
-        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Fn);
-        self.fmt.fn_str(item.span,
-                        sub_span,
-                        item.id,
-                        &qualname[..],
-                        self.cur_scope);
-
-        self.process_formals(&decl.inputs, &qualname[..]);
-
-        // walk arg and return types
-        for arg in &decl.inputs {
-            self.visit_ty(&*arg.ty);
-        }
-
-        if let ast::Return(ref ret_ty) = decl.output {
-            self.visit_ty(&**ret_ty);
-        }
-
-        // walk the body
-        self.nest(item.id, |v| v.visit_block(&*body));
-
-        self.process_generic_params(ty_params, item.span, &qualname[..], item.id);
-    }
-
-    fn process_static(&mut self,
-                      item: &ast::Item,
-                      typ: &ast::Ty,
-                      mt: ast::Mutability,
-                      expr: &ast::Expr)
-    {
-        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
-
-        // If the variable is immutable, save the initialising expression.
-        let (value, keyword) = match mt {
-            ast::MutMutable => (String::from_str("<mutable>"), keywords::Mut),
-            ast::MutImmutable => (self.span.snippet(expr.span), keywords::Static),
-        };
-
-        let sub_span = self.span.sub_span_after_keyword(item.span, keyword);
-        self.fmt.static_str(item.span,
-                            sub_span,
-                            item.id,
-                            &get_ident(item.ident),
-                            &qualname[..],
-                            &value[..],
-                            &ty_to_string(&*typ),
-                            self.cur_scope);
-
-        // walk type and init value
-        self.visit_ty(&*typ);
-        self.visit_expr(expr);
-    }
-
-    fn process_const(&mut self,
-                     id: ast::NodeId,
-                     ident: &ast::Ident,
-                     span: Span,
-                     typ: &ast::Ty,
-                     expr: &ast::Expr)
-    {
-        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(id));
-
-        let sub_span = self.span.sub_span_after_keyword(span,
-                                                        keywords::Const);
-        self.fmt.static_str(span,
-                            sub_span,
-                            id,
-                            &get_ident((*ident).clone()),
-                            &qualname[..],
-                            "",
-                            &ty_to_string(&*typ),
-                            self.cur_scope);
-
-        // walk type and init value
-        self.visit_ty(typ);
-        self.visit_expr(expr);
-    }
-
-    fn process_struct(&mut self,
-                      item: &ast::Item,
-                      def: &ast::StructDef,
-                      ty_params: &ast::Generics) {
-        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
-
-        let ctor_id = match def.ctor_id {
-            Some(node_id) => node_id,
-            None => -1,
-        };
-        let val = self.span.snippet(item.span);
-        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Struct);
-        self.fmt.struct_str(item.span,
-                            sub_span,
-                            item.id,
-                            ctor_id,
-                            &qualname[..],
-                            self.cur_scope,
-                            &val[..]);
-
-        // fields
-        for field in &def.fields {
-            self.process_struct_field_def(field, &qualname[..], item.id);
-            self.visit_ty(&*field.node.ty);
-        }
-
-        self.process_generic_params(ty_params, item.span, &qualname[..], item.id);
-    }
-
-    fn process_enum(&mut self,
-                    item: &ast::Item,
-                    enum_definition: &ast::EnumDef,
-                    ty_params: &ast::Generics) {
-        let enum_name = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
-        let val = self.span.snippet(item.span);
-        match self.span.sub_span_after_keyword(item.span, keywords::Enum) {
-            Some(sub_span) => self.fmt.enum_str(item.span,
-                                                Some(sub_span),
-                                                item.id,
-                                                &enum_name[..],
-                                                self.cur_scope,
-                                                &val[..]),
-            None => self.sess.span_bug(item.span,
-                                       &format!("Could not find subspan for enum {}",
-                                               enum_name)),
-        }
-        for variant in &enum_definition.variants {
-            let name = get_ident(variant.node.name);
-            let name = &name;
-            let mut qualname = enum_name.clone();
-            qualname.push_str("::");
-            qualname.push_str(name);
-            let val = self.span.snippet(variant.span);
-            match variant.node.kind {
-                ast::TupleVariantKind(ref args) => {
-                    // first ident in span is the variant's name
-                    self.fmt.tuple_variant_str(variant.span,
-                                               self.span.span_for_first_ident(variant.span),
-                                               variant.node.id,
-                                               name,
-                                               &qualname[..],
-                                               &enum_name[..],
-                                               &val[..],
-                                               item.id);
-                    for arg in args {
-                        self.visit_ty(&*arg.ty);
-                    }
-                }
-                ast::StructVariantKind(ref struct_def) => {
-                    let ctor_id = match struct_def.ctor_id {
-                        Some(node_id) => node_id,
-                        None => -1,
-                    };
-                    self.fmt.struct_variant_str(
-                        variant.span,
-                        self.span.span_for_first_ident(variant.span),
-                        variant.node.id,
-                        ctor_id,
-                        &qualname[..],
-                        &enum_name[..],
-                        &val[..],
-                        item.id);
-
-                    for field in &struct_def.fields {
-                        self.process_struct_field_def(field, &qualname, variant.node.id);
-                        self.visit_ty(&*field.node.ty);
-                    }
-                }
-            }
-        }
-
-        self.process_generic_params(ty_params, item.span, &enum_name[..], item.id);
-    }
-
-    fn process_impl(&mut self,
-                    item: &ast::Item,
-                    type_parameters: &ast::Generics,
-                    trait_ref: &Option<ast::TraitRef>,
-                    typ: &ast::Ty,
-                    impl_items: &[P<ast::ImplItem>]) {
-        let trait_id = trait_ref.as_ref().and_then(|tr| self.lookup_type_ref(tr.ref_id));
-        match typ.node {
-            // Common case impl for a struct or something basic.
-            ast::TyPath(None, ref path) => {
-                let sub_span = self.span.sub_span_for_type_name(path.span);
-                let self_id = self.lookup_type_ref(typ.id).map(|id| {
-                    self.fmt.ref_str(recorder::TypeRef,
-                                     path.span,
-                                     sub_span,
-                                     id,
-                                     self.cur_scope);
-                    id
-                });
-                self.fmt.impl_str(path.span,
-                                  sub_span,
-                                  item.id,
-                                  self_id,
-                                  trait_id,
-                                  self.cur_scope);
-            },
-            _ => {
-                // Less useful case, impl for a compound type.
-                self.visit_ty(&*typ);
-
-                let sub_span = self.span.sub_span_for_type_name(typ.span);
-                self.fmt.impl_str(typ.span,
-                                  sub_span,
-                                  item.id,
-                                  None,
-                                  trait_id,
-                                  self.cur_scope);
-            }
-        }
-
-        match *trait_ref {
-            Some(ref trait_ref) => self.process_trait_ref(trait_ref),
-            None => (),
-        }
-
-        self.process_generic_params(type_parameters, item.span, "", item.id);
-        for impl_item in impl_items {
-            self.visit_impl_item(impl_item);
-        }
-    }
-
-    fn process_trait(&mut self,
-                     item: &ast::Item,
-                     generics: &ast::Generics,
-                     trait_refs: &OwnedSlice<ast::TyParamBound>,
-                     methods: &[P<ast::TraitItem>]) {
-        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
-        let val = self.span.snippet(item.span);
-        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Trait);
-        self.fmt.trait_str(item.span,
-                           sub_span,
-                           item.id,
-                           &qualname[..],
-                           self.cur_scope,
-                           &val[..]);
-
-        // super-traits
-        for super_bound in &**trait_refs {
-            let trait_ref = match *super_bound {
-                ast::TraitTyParamBound(ref trait_ref, _) => {
-                    trait_ref
-                }
-                ast::RegionTyParamBound(..) => {
-                    continue;
-                }
-            };
-
-            let trait_ref = &trait_ref.trait_ref;
-            match self.lookup_type_ref(trait_ref.ref_id) {
-                Some(id) => {
-                    let sub_span = self.span.sub_span_for_type_name(trait_ref.path.span);
-                    self.fmt.ref_str(recorder::TypeRef,
-                                     trait_ref.path.span,
-                                     sub_span,
-                                     id,
-                                     self.cur_scope);
-                    self.fmt.inherit_str(trait_ref.path.span,
-                                         sub_span,
-                                         id,
-                                         item.id);
-                },
-                None => ()
-            }
-        }
-
-        // walk generics and methods
-        self.process_generic_params(generics, item.span, &qualname[..], item.id);
-        for method in methods {
-            self.visit_trait_item(method)
-        }
-    }
-
-    fn process_mod(&mut self,
-                   item: &ast::Item,  // The module in question, represented as an item.
-                   m: &ast::Mod) {
-        let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
-
-        let cm = self.sess.codemap();
-        let filename = cm.span_to_filename(m.inner);
-
-        let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Mod);
-        self.fmt.mod_str(item.span,
-                         sub_span,
-                         item.id,
-                         &qualname[..],
-                         self.cur_scope,
-                         &filename[..]);
-
-        self.nest(item.id, |v| visit::walk_mod(v, m));
-    }
-
-    fn process_path(&mut self,
-                    id: NodeId,
-                    span: Span,
-                    path: &ast::Path,
-                    ref_kind: Option<recorder::Row>) {
-        if generated_code(span) {
-            return
-        }
-
-        let def_map = self.analysis.ty_cx.def_map.borrow();
-        if !def_map.contains_key(&id) {
-            self.sess.span_bug(span,
-                               &format!("def_map has no key for {} in visit_expr", id));
-        }
-        let def = def_map.get(&id).unwrap().full_def();
-        let sub_span = self.span.span_for_last_ident(span);
-        match def {
-            def::DefUpvar(..) |
-            def::DefLocal(..) |
-            def::DefStatic(..) |
-            def::DefConst(..) |
-            def::DefAssociatedConst(..) |
-            def::DefVariant(..) => self.fmt.ref_str(ref_kind.unwrap_or(recorder::VarRef),
-                                                    span,
-                                                    sub_span,
-                                                    def.def_id(),
-                                                    self.cur_scope),
-            def::DefStruct(def_id) => self.fmt.ref_str(recorder::StructRef,
-                                                       span,
-                                                       sub_span,
-                                                       def_id,
-                                                       self.cur_scope),
-            def::DefTy(def_id, _) => self.fmt.ref_str(recorder::TypeRef,
-                                                      span,
-                                                      sub_span,
-                                                      def_id,
-                                                      self.cur_scope),
-            def::DefMethod(declid, provenence) => {
-                let sub_span = self.span.sub_span_for_meth_name(span);
-                let defid = if declid.krate == ast::LOCAL_CRATE {
-                    let ti = ty::impl_or_trait_item(&self.analysis.ty_cx,
-                                                    declid);
-                    match provenence {
-                        def::FromTrait(def_id) => {
-                            Some(ty::trait_items(&self.analysis.ty_cx,
-                                                 def_id)
-                                    .iter()
-                                    .find(|mr| {
-                                        mr.name() == ti.name()
-                                    })
-                                    .unwrap()
-                                    .def_id())
-                        }
-                        def::FromImpl(def_id) => {
-                            let impl_items = self.analysis
-                                                 .ty_cx
-                                                 .impl_items
-                                                 .borrow();
-                            Some(impl_items.get(&def_id)
-                                           .unwrap()
-                                           .iter()
-                                           .find(|mr| {
-                                                ty::impl_or_trait_item(
-                                                    &self.analysis.ty_cx,
-                                                    mr.def_id()
-                                                ).name() == ti.name()
-                                            })
-                                           .unwrap()
-                                           .def_id())
-                        }
-                    }
-                } else {
-                    None
-                };
-                self.fmt.meth_call_str(span,
-                                       sub_span,
-                                       defid,
-                                       Some(declid),
-                                       self.cur_scope);
-            },
-            def::DefFn(def_id, _) => {
-                self.fmt.fn_call_str(span,
-                                     sub_span,
-                                     def_id,
-                                     self.cur_scope)
-            }
-            _ => self.sess.span_bug(span,
-                                    &format!("Unexpected def kind while looking \
-                                              up path in `{}`: `{:?}`",
-                                             self.span.snippet(span),
-                                             def)),
-        }
-        // modules or types in the path prefix
-        match def {
-            def::DefMethod(did, _) => {
-                let ti = ty::impl_or_trait_item(&self.analysis.ty_cx, did);
-                if let ty::MethodTraitItem(m) = ti {
-                    if m.explicit_self == ty::StaticExplicitSelfCategory {
-                        self.write_sub_path_trait_truncated(path);
-                    }
-                }
-            }
-            def::DefLocal(_) |
-            def::DefStatic(_,_) |
-            def::DefConst(..) |
-            def::DefAssociatedConst(..) |
-            def::DefStruct(_) |
-            def::DefVariant(..) |
-            def::DefFn(..) => self.write_sub_paths_truncated(path, false),
-            _ => {},
-        }
-    }
-
-    fn process_struct_lit(&mut self,
-                          ex: &ast::Expr,
-                          path: &ast::Path,
-                          fields: &Vec<ast::Field>,
-                          base: &Option<P<ast::Expr>>) {
-        if generated_code(path.span) {
-            return
-        }
-
-        self.write_sub_paths_truncated(path, false);
-
-        let ty = &ty::expr_ty_adjusted(&self.analysis.ty_cx, ex).sty;
-        let struct_def = match *ty {
-            ty::ty_struct(def_id, _) => {
-                let sub_span = self.span.span_for_last_ident(path.span);
-                self.fmt.ref_str(recorder::StructRef,
-                                 path.span,
-                                 sub_span,
-                                 def_id,
-                                 self.cur_scope);
-                Some(def_id)
-            }
-            _ => None
-        };
-
-        for field in fields {
-            match struct_def {
-                Some(struct_def) => {
-                    let fields = ty::lookup_struct_fields(&self.analysis.ty_cx, struct_def);
-                    for f in &fields {
-                        if generated_code(field.ident.span) {
-                            continue;
-                        }
-                        if f.name == field.ident.node.name {
-                            // We don't really need a sub-span here, but no harm done
-                            let sub_span = self.span.span_for_last_ident(field.ident.span);
-                            self.fmt.ref_str(recorder::VarRef,
-                                             field.ident.span,
-                                             sub_span,
-                                             f.id,
-                                             self.cur_scope);
-                        }
-                    }
-                }
-                None => {}
-            }
-
-            self.visit_expr(&*field.expr)
-        }
-        visit::walk_expr_opt(self, base)
-    }
-
-    fn process_method_call(&mut self,
-                           ex: &ast::Expr,
-                           args: &Vec<P<ast::Expr>>) {
-        let method_map = self.analysis.ty_cx.method_map.borrow();
-        let method_callee = method_map.get(&ty::MethodCall::expr(ex.id)).unwrap();
-        let (def_id, decl_id) = match method_callee.origin {
-            ty::MethodStatic(def_id) |
-            ty::MethodStaticClosure(def_id) => {
-                // method invoked on an object with a concrete type (not a static method)
-                let decl_id =
-                    match ty::trait_item_of_item(&self.analysis.ty_cx,
-                                                 def_id) {
-                        None => None,
-                        Some(decl_id) => Some(decl_id.def_id()),
-                    };
-
-                // This incantation is required if the method referenced is a
-                // trait's default implementation.
-                let def_id = match ty::impl_or_trait_item(&self.analysis
-                                                               .ty_cx,
-                                                          def_id) {
-                    ty::MethodTraitItem(method) => {
-                        method.provided_source.unwrap_or(def_id)
-                    }
-                    _ => self.sess
-                             .span_bug(ex.span,
-                                       "save::process_method_call: non-method \
-                                        DefId in MethodStatic or MethodStaticClosure"),
-                };
-                (Some(def_id), decl_id)
-            }
-            ty::MethodTypeParam(ref mp) => {
-                // method invoked on a type parameter
-                let trait_item = ty::trait_item(&self.analysis.ty_cx,
-                                                mp.trait_ref.def_id,
-                                                mp.method_num);
-                (None, Some(trait_item.def_id()))
-            }
-            ty::MethodTraitObject(ref mo) => {
-                // method invoked on a trait instance
-                let trait_item = ty::trait_item(&self.analysis.ty_cx,
-                                                mo.trait_ref.def_id,
-                                                mo.method_num);
-                (None, Some(trait_item.def_id()))
-            }
-        };
-        let sub_span = self.span.sub_span_for_meth_name(ex.span);
-        self.fmt.meth_call_str(ex.span,
-                               sub_span,
-                               def_id,
-                               decl_id,
-                               self.cur_scope);
-
-        // walk receiver and args
-        visit::walk_exprs(self, &args[..]);
-    }
-
-    fn process_pat(&mut self, p:&ast::Pat) {
-        if generated_code(p.span) {
-            return
-        }
-
-        match p.node {
-            ast::PatStruct(ref path, ref fields, _) => {
-                self.collected_paths.push((p.id, path.clone(), false, recorder::StructRef));
-                visit::walk_path(self, path);
-
-                let def = self.analysis.ty_cx.def_map.borrow().get(&p.id).unwrap().full_def();
-                let struct_def = match def {
-                    def::DefConst(..) | def::DefAssociatedConst(..) => None,
-                    def::DefVariant(_, variant_id, _) => Some(variant_id),
-                    _ => {
-                        match ty::ty_to_def_id(ty::node_id_to_type(&self.analysis.ty_cx, p.id)) {
-                            None => {
-                                self.sess.span_bug(p.span,
-                                                   &format!("Could not find struct_def for `{}`",
-                                                            self.span.snippet(p.span)));
-                            }
-                            Some(def_id) => Some(def_id),
-                        }
-                    }
-                };
-
-                if let Some(struct_def) = struct_def {
-                    let struct_fields = ty::lookup_struct_fields(&self.analysis.ty_cx, struct_def);
-                    for &Spanned { node: ref field, span } in fields {
-                        let sub_span = self.span.span_for_first_ident(span);
-                        for f in &struct_fields {
-                            if f.name == field.ident.name {
-                                self.fmt.ref_str(recorder::VarRef,
-                                                 span,
-                                                 sub_span,
-                                                 f.id,
-                                                 self.cur_scope);
-                                break;
-                            }
-                        }
-                        self.visit_pat(&*field.pat);
-                    }
-                }
-            }
-            ast::PatEnum(ref path, _) |
-            ast::PatQPath(_, ref path) => {
-                self.collected_paths.push((p.id, path.clone(), false, recorder::VarRef));
-                visit::walk_pat(self, p);
-            }
-            ast::PatIdent(bm, ref path1, ref optional_subpattern) => {
-                let immut = match bm {
-                    // Even if the ref is mut, you can't change the ref, only
-                    // the data pointed at, so showing the initialising expression
-                    // is still worthwhile.
-                    ast::BindByRef(_) => true,
-                    ast::BindByValue(mt) => {
-                        match mt {
-                            ast::MutMutable => false,
-                            ast::MutImmutable => true,
-                        }
-                    }
-                };
-                // collect path for either visit_local or visit_arm
-                let path = ast_util::ident_to_path(path1.span,path1.node);
-                self.collected_paths.push((p.id, path, immut, recorder::VarRef));
-                match *optional_subpattern {
-                    None => {}
-                    Some(ref subpattern) => self.visit_pat(&**subpattern)
-                }
-            }
-            _ => visit::walk_pat(self, p)
-        }
-    }
-}
-
-impl<'l, 'tcx, 'v> Visitor<'v> for DxrVisitor<'l, 'tcx> {
-    fn visit_item(&mut self, item: &ast::Item) {
-        if generated_code(item.span) {
-            return
-        }
-
-        match item.node {
-            ast::ItemUse(ref use_item) => {
-                match use_item.node {
-                    ast::ViewPathSimple(ident, ref path) => {
-                        let sub_span = self.span.span_for_last_ident(path.span);
-                        let mod_id = match self.lookup_type_ref(item.id) {
-                            Some(def_id) => {
-                                match self.lookup_def_kind(item.id, path.span) {
-                                    Some(kind) => self.fmt.ref_str(kind,
-                                                                   path.span,
-                                                                   sub_span,
-                                                                   def_id,
-                                                                   self.cur_scope),
-                                    None => {},
-                                }
-                                Some(def_id)
-                            },
-                            None => None,
-                        };
-
-                        // 'use' always introduces an alias, if there is not an explicit
-                        // one, there is an implicit one.
-                        let sub_span =
-                            match self.span.sub_span_after_keyword(use_item.span, keywords::As) {
-                                Some(sub_span) => Some(sub_span),
-                                None => sub_span,
-                            };
-
-                        self.fmt.use_alias_str(path.span,
-                                               sub_span,
-                                               item.id,
-                                               mod_id,
-                                               &get_ident(ident),
-                                               self.cur_scope);
-                        self.write_sub_paths_truncated(path, true);
-                    }
-                    ast::ViewPathGlob(ref path) => {
-                        // Make a comma-separated list of names of imported modules.
-                        let mut name_string = String::new();
-                        let glob_map = &self.analysis.glob_map;
-                        let glob_map = glob_map.as_ref().unwrap();
-                        if glob_map.contains_key(&item.id) {
-                            for n in glob_map.get(&item.id).unwrap() {
-                                if !name_string.is_empty() {
-                                    name_string.push_str(", ");
-                                }
-                                name_string.push_str(n.as_str());
-                            }
-                        }
-
-                        let sub_span = self.span.sub_span_of_token(path.span,
-                                                                   token::BinOp(token::Star));
-                        self.fmt.use_glob_str(path.span,
-                                              sub_span,
-                                              item.id,
-                                              &name_string,
-                                              self.cur_scope);
-                        self.write_sub_paths(path, true);
-                    }
-                    ast::ViewPathList(ref path, ref list) => {
-                        for plid in list {
-                            match plid.node {
-                                ast::PathListIdent { id, .. } => {
-                                    match self.lookup_type_ref(id) {
-                                        Some(def_id) =>
-                                            match self.lookup_def_kind(id, plid.span) {
-                                                Some(kind) => {
-                                                    self.fmt.ref_str(
-                                                        kind, plid.span,
-                                                        Some(plid.span),
-                                                        def_id, self.cur_scope);
-                                                }
-                                                None => ()
-                                            },
-                                        None => ()
-                                    }
-                                },
-                                ast::PathListMod { .. } => ()
-                            }
-                        }
-
-                        self.write_sub_paths(path, true);
-                    }
-                }
-            }
-            ast::ItemExternCrate(ref s) => {
-                let name = get_ident(item.ident);
-                let name = &name;
-                let location = match *s {
-                    Some(s) => s.to_string(),
-                    None => name.to_string(),
-                };
-                let alias_span = self.span.span_for_last_ident(item.span);
-                let cnum = match self.sess.cstore.find_extern_mod_stmt_cnum(item.id) {
-                    Some(cnum) => cnum,
-                    None => 0,
-                };
-                self.fmt.extern_crate_str(item.span,
-                                          alias_span,
-                                          item.id,
-                                          cnum,
-                                          name,
-                                          &location[..],
-                                          self.cur_scope);
-            }
-            ast::ItemFn(ref decl, _, _, ref ty_params, ref body) =>
-                self.process_fn(item, &**decl, ty_params, &**body),
-            ast::ItemStatic(ref typ, mt, ref expr) =>
-                self.process_static(item, &**typ, mt, &**expr),
-            ast::ItemConst(ref typ, ref expr) =>
-                self.process_const(item.id, &item.ident, item.span, &*typ, &*expr),
-            ast::ItemStruct(ref def, ref ty_params) => self.process_struct(item, &**def, ty_params),
-            ast::ItemEnum(ref def, ref ty_params) => self.process_enum(item, def, ty_params),
-            ast::ItemImpl(_, _,
-                          ref ty_params,
-                          ref trait_ref,
-                          ref typ,
-                          ref impl_items) => {
-                self.process_impl(item,
-                                  ty_params,
-                                  trait_ref,
-                                  &**typ,
-                                  impl_items)
-            }
-            ast::ItemTrait(_, ref generics, ref trait_refs, ref methods) =>
-                self.process_trait(item, generics, trait_refs, methods),
-            ast::ItemMod(ref m) => self.process_mod(item, m),
-            ast::ItemTy(ref ty, ref ty_params) => {
-                let qualname = format!("::{}", self.analysis.ty_cx.map.path_to_string(item.id));
-                let value = ty_to_string(&**ty);
-                let sub_span = self.span.sub_span_after_keyword(item.span, keywords::Type);
-                self.fmt.typedef_str(item.span,
-                                     sub_span,
-                                     item.id,
-                                     &qualname[..],
-                                     &value[..]);
-
-                self.visit_ty(&**ty);
-                self.process_generic_params(ty_params, item.span, &qualname, item.id);
-            },
-            ast::ItemMac(_) => (),
-            _ => visit::walk_item(self, item),
-        }
-    }
-
-    fn visit_generics(&mut self, generics: &ast::Generics) {
-        for param in &*generics.ty_params {
-            for bound in &*param.bounds {
-                if let ast::TraitTyParamBound(ref trait_ref, _) = *bound {
-                    self.process_trait_ref(&trait_ref.trait_ref);
-                }
-            }
-            if let Some(ref ty) = param.default {
-                self.visit_ty(&**ty);
-            }
-        }
-    }
-
-    fn visit_trait_item(&mut self, trait_item: &ast::TraitItem) {
-        match trait_item.node {
-            ast::ConstTraitItem(ref ty, Some(ref expr)) => {
-                self.process_const(trait_item.id, &trait_item.ident,
-                                   trait_item.span, &*ty, &*expr);
-            }
-            ast::MethodTraitItem(ref sig, ref body) => {
-                self.process_method(sig, body.as_ref().map(|x| &**x),
-                                    trait_item.id, trait_item.ident.name, trait_item.span);
-            }
-            ast::ConstTraitItem(_, None) |
-            ast::TypeTraitItem(..) => {}
-        }
-    }
-
-    fn visit_impl_item(&mut self, impl_item: &ast::ImplItem) {
-        match impl_item.node {
-            ast::ConstImplItem(ref ty, ref expr) => {
-                self.process_const(impl_item.id, &impl_item.ident,
-                                   impl_item.span, &ty, &expr);
-            }
-            ast::MethodImplItem(ref sig, ref body) => {
-                self.process_method(sig, Some(body), impl_item.id,
-                                    impl_item.ident.name, impl_item.span);
-            }
-            ast::TypeImplItem(_) |
-            ast::MacImplItem(_) => {}
-        }
-    }
-
-    fn visit_ty(&mut self, t: &ast::Ty) {
-        if generated_code(t.span) {
-            return
-        }
-
-        match t.node {
-            ast::TyPath(_, ref path) => {
-                match self.lookup_type_ref(t.id) {
-                    Some(id) => {
-                        let sub_span = self.span.sub_span_for_type_name(t.span);
-                        self.fmt.ref_str(recorder::TypeRef,
-                                         t.span,
-                                         sub_span,
-                                         id,
-                                         self.cur_scope);
-                    },
-                    None => ()
-                }
-
-                self.write_sub_paths_truncated(path, false);
-
-                visit::walk_path(self, path);
-            },
-            _ => visit::walk_ty(self, t),
-        }
-    }
-
-    fn visit_expr(&mut self, ex: &ast::Expr) {
-        if generated_code(ex.span) {
-            return
-        }
-
-        match ex.node {
-            ast::ExprCall(ref _f, ref _args) => {
-                // Don't need to do anything for function calls,
-                // because just walking the callee path does what we want.
-                visit::walk_expr(self, ex);
-            }
-            ast::ExprPath(_, ref path) => {
-                self.process_path(ex.id, path.span, path, None);
-                visit::walk_expr(self, ex);
-            }
-            ast::ExprStruct(ref path, ref fields, ref base) =>
-                self.process_struct_lit(ex, path, fields, base),
-            ast::ExprMethodCall(_, _, ref args) => self.process_method_call(ex, args),
-            ast::ExprField(ref sub_ex, ident) => {
-                if generated_code(sub_ex.span) {
-                    return
-                }
-
-                self.visit_expr(&**sub_ex);
-                let ty = &ty::expr_ty_adjusted(&self.analysis.ty_cx, &**sub_ex).sty;
-                match *ty {
-                    ty::ty_struct(def_id, _) => {
-                        let fields = ty::lookup_struct_fields(&self.analysis.ty_cx, def_id);
-                        for f in &fields {
-                            if f.name == ident.node.name {
-                                let sub_span = self.span.span_for_last_ident(ex.span);
-                                self.fmt.ref_str(recorder::VarRef,
-                                                 ex.span,
-                                                 sub_span,
-                                                 f.id,
-                                                 self.cur_scope);
-                                break;
-                            }
-                        }
-                    }
-                    _ => self.sess.span_bug(ex.span,
-                                            &format!("Expected struct type, found {:?}", ty)),
-                }
-            },
-            ast::ExprTupField(ref sub_ex, idx) => {
-                if generated_code(sub_ex.span) {
-                    return
-                }
-
-                self.visit_expr(&**sub_ex);
-
-                let ty = &ty::expr_ty_adjusted(&self.analysis.ty_cx, &**sub_ex).sty;
-                match *ty {
-                    ty::ty_struct(def_id, _) => {
-                        let fields = ty::lookup_struct_fields(&self.analysis.ty_cx, def_id);
-                        for (i, f) in fields.iter().enumerate() {
-                            if i == idx.node {
-                                let sub_span = self.span.sub_span_after_token(ex.span, token::Dot);
-                                self.fmt.ref_str(recorder::VarRef,
-                                                 ex.span,
-                                                 sub_span,
-                                                 f.id,
-                                                 self.cur_scope);
-                                break;
-                            }
-                        }
-                    }
-                    ty::ty_tup(_) => {}
-                    _ => self.sess.span_bug(ex.span,
-                                            &format!("Expected struct or tuple \
-                                                      type, found {:?}", ty)),
-                }
-            },
-            ast::ExprClosure(_, ref decl, ref body) => {
-                if generated_code(body.span) {
-                    return
-                }
-
-                let mut id = String::from_str("$");
-                id.push_str(&ex.id.to_string());
-                self.process_formals(&decl.inputs, &id[..]);
-
-                // walk arg and return types
-                for arg in &decl.inputs {
-                    self.visit_ty(&*arg.ty);
-                }
-
-                if let ast::Return(ref ret_ty) = decl.output {
-                    self.visit_ty(&**ret_ty);
-                }
-
-                // walk the body
-                self.nest(ex.id, |v| v.visit_block(&**body));
-            },
-            _ => {
-                visit::walk_expr(self, ex)
-            },
-        }
-    }
-
-    fn visit_mac(&mut self, _: &ast::Mac) {
-        // Just stop, macros are poison to us.
-    }
-
-    fn visit_pat(&mut self, p: &ast::Pat) {
-        self.process_pat(p);
-        if !self.collecting {
-            self.collected_paths.clear();
-        }
-    }
-
-    fn visit_arm(&mut self, arm: &ast::Arm) {
-        assert!(self.collected_paths.is_empty() && !self.collecting);
-        self.collecting = true;
-        for pattern in &arm.pats {
-            // collect paths from the arm's patterns
-            self.visit_pat(&**pattern);
-        }
-
-        // This is to get around borrow checking, because we need mut self to call process_path.
-        let mut paths_to_process = vec![];
-        // process collected paths
-        for &(id, ref p, ref immut, ref_kind) in &self.collected_paths {
-            let def_map = self.analysis.ty_cx.def_map.borrow();
-            if !def_map.contains_key(&id) {
-                self.sess.span_bug(p.span,
-                                   &format!("def_map has no key for {} in visit_arm",
-                                           id));
-            }
-            let def = def_map.get(&id).unwrap().full_def();
-            match def {
-                def::DefLocal(id)  => {
-                    let value = if *immut {
-                        self.span.snippet(p.span).to_string()
-                    } else {
-                        "<mutable>".to_string()
-                    };
-
-                    assert!(p.segments.len() == 1, "qualified path for local variable def in arm");
-                    self.fmt.variable_str(p.span,
-                                          Some(p.span),
-                                          id,
-                                          &path_to_string(p),
-                                          &value[..],
-                                          "")
-                }
-                def::DefVariant(..) | def::DefTy(..) | def::DefStruct(..) => {
-                    paths_to_process.push((id, p.clone(), Some(ref_kind)))
-                }
-                // FIXME(nrc) what are these doing here?
-                def::DefStatic(_, _) |
-                def::DefConst(..) |
-                def::DefAssociatedConst(..) => {}
-                _ => error!("unexpected definition kind when processing collected paths: {:?}",
-                            def)
-            }
-        }
-        for &(id, ref path, ref_kind) in &paths_to_process {
-            self.process_path(id, path.span, path, ref_kind);
-        }
-        self.collecting = false;
-        self.collected_paths.clear();
-        visit::walk_expr_opt(self, &arm.guard);
-        self.visit_expr(&*arm.body);
-    }
-
-    fn visit_stmt(&mut self, s: &ast::Stmt) {
-        if generated_code(s.span) {
-            return
-        }
-
-        visit::walk_stmt(self, s)
-    }
-
-    fn visit_local(&mut self, l: &ast::Local) {
-        if generated_code(l.span) {
-            return
-        }
-
-        // The local could declare multiple new vars, we must walk the
-        // pattern and collect them all.
-        assert!(self.collected_paths.is_empty() && !self.collecting);
-        self.collecting = true;
-        self.visit_pat(&*l.pat);
-        self.collecting = false;
-
-        let value = self.span.snippet(l.span);
-
-        for &(id, ref p, ref immut, _) in &self.collected_paths {
-            let value = if *immut { value.to_string() } else { "<mutable>".to_string() };
-            let types = self.analysis.ty_cx.node_types();
-            let typ = ppaux::ty_to_string(&self.analysis.ty_cx, *types.get(&id).unwrap());
-            // Get the span only for the name of the variable (I hope the path
-            // is only ever a variable name, but who knows?).
-            let sub_span = self.span.span_for_last_ident(p.span);
-            // Rust uses the id of the pattern for var lookups, so we'll use it too.
-            self.fmt.variable_str(p.span,
-                                  sub_span,
-                                  id,
-                                  &path_to_string(p),
-                                  &value[..],
-                                  &typ[..]);
-        }
-        self.collected_paths.clear();
-
-        // Just walk the initialiser and type (don't want to walk the pattern again).
-        visit::walk_ty_opt(self, &l.ty);
-        visit::walk_expr_opt(self, &l.init);
-    }
-}
+mod dump_csv;
 
 #[allow(deprecated)]
 pub fn process_crate(sess: &Session,
@@ -1562,27 +76,21 @@ pub fn process_crate(sess: &Session,
     };
     root_path.pop();
 
-    let mut visitor = DxrVisitor {
-        sess: sess,
-        analysis: analysis,
-        collected_paths: vec!(),
-        collecting: false,
-        fmt: FmtStrs::new(box Recorder {
-                            out: output_file,
-                            dump_spans: false,
-                        },
-                        SpanUtils {
-                            sess: sess,
-                            err_count: Cell::new(0)
-                        }),
-        span: SpanUtils {
-            sess: sess,
-            err_count: Cell::new(0)
-        },
-        cur_scope: 0
-    };
+    let mut visitor = dump_csv::DumpCsvVisitor::new(sess, analysis, output_file);
 
     visitor.dump_crate_info(&cratename[..], krate);
-
     visit::walk_crate(&mut visitor, krate);
 }
+
+// Utility functions for the module.
+
+// Helper function to escape quotes in a string
+fn escape(s: String) -> String {
+    s.replace("\"", "\"\"")
+}
+
+// If the expression is a macro expansion or other generated code, run screaming
+// and don't index.
+fn generated_code(span: Span) -> bool {
+    span.expn_id != NO_EXPANSION || span  == DUMMY_SP
+}