review changes

Author: Nick Cameron

src/Cargo.lock

@@ -11,6 +11,7 @@ crate-type = ["dylib"]
 [dependencies]
 log = "0.3"
 rustc = { path = "../librustc" }
+rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_typeck = { path = "../librustc_typeck" }
 syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }

src/librustc_save_analysis/Cargo.toml

@@ -29,8 +29,8 @@ use rustc::hir::def_id::DefId;
 use rustc::hir::map::Node;
 use rustc::session::Session;
 use rustc::ty::{self, TyCtxt};
+use rustc_data_structures::fx::FxHashSet;
 
-use std::collections::HashSet;
 use std::path::Path;
 
 use syntax::ast::{self, NodeId, PatKind, Attribute, CRATE_NODE_ID};
@@ -75,7 +75,7 @@ pub struct DumpVisitor<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> {
     // we only write one macro def per unique macro definition, and
     // one macro use per unique callsite span.
     // mac_defs: HashSet<Span>,
-    macro_calls: HashSet<Span>,
+    macro_calls: FxHashSet<Span>,
 }
 
 impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
@@ -91,7 +91,7 @@ impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
             span: span_utils.clone(),
             cur_scope: CRATE_NODE_ID,
             // mac_defs: HashSet::new(),
-            macro_calls: HashSet::new(),
+            macro_calls: FxHashSet(),
         }
     }
 

src/librustc_save_analysis/dump_visitor.rs

@@ -23,6 +23,7 @@
 
 #[macro_use] extern crate log;
 #[macro_use] extern crate syntax;
+extern crate rustc_data_structures;
 extern crate rustc_serialize;
 extern crate rustc_typeck;
 extern crate syntax_pos;

src/librustc_save_analysis/lib.rs

@@ -398,9 +398,10 @@ impl<'a> SpanUtils<'a> {
             return false;
         }
         // If sub_span is none, filter out generated code.
-        if sub_span.is_none() {
-            return true;
-        }
+        let sub_span = match sub_span {
+            Some(ss) => ss,
+            None => return true,
+        };
 
         //If the span comes from a fake filemap, filter it.
         if !self.sess.codemap().lookup_char_pos(parent.lo).file.is_real_file() {
@@ -409,7 +410,7 @@ impl<'a> SpanUtils<'a> {
 
         // Otherwise, a generated span is deemed invalid if it is not a sub-span of the root
         // callsite. This filters out macro internal variables and most malformed spans.
-        !parent.source_callsite().contains(sub_span.unwrap())
+        !parent.source_callsite().contains(sub_span)
     }
 }