Auto merge of #45468 - Xanewok:crate-source, r=nrc

Emit crate disambiguators in save-analysis data

Needed for rust-dev-tools/rls-analysis#93.
Blocked by rust-dev-tools/rls-data#11. (For now, this pulls my branch [rls-data/crate-source](https://github.com/Xanewok/rls-data/tree/crate-source))

This will allow to disambiguate different crates types/versions when indexing resulting save-analysis data (most importantly allow to support bin+lib and different crate versions).

r? @nrc

src/librustc/ich/fingerprint.rs

@@ -29,6 +29,11 @@ impl Fingerprint {
         self.0
     }
 
+    #[inline]
+    pub fn as_value(&self) -> (u64, u64) {
+        (self.0, self.1)
+    }
+
     #[inline]
     pub fn combine(self, other: Fingerprint) -> Fingerprint {
         // See https://stackoverflow.com/a/27952689 on why this function is

src/librustc_save_analysis/Cargo.toml

@@ -15,7 +15,7 @@ rustc_data_structures = { path = "../librustc_data_structures" }
 rustc_typeck = { path = "../librustc_typeck" }
 syntax = { path = "../libsyntax" }
 syntax_pos = { path = "../libsyntax_pos" }
-rls-data = "0.11"
+rls-data = "0.12"
 rls-span = "0.4"
 # FIXME(#40527) should move rustc serialize out of tree
 rustc-serialize = "0.3"

src/librustc_save_analysis/dump_visitor.rs

@@ -46,8 +46,8 @@ use json_dumper::{JsonDumper, DumpOutput};
 use span_utils::SpanUtils;
 use sig;
 
-use rls_data::{CratePreludeData, Import, ImportKind, SpanData, Ref, RefKind,
-               Def, DefKind, Relation, RelationKind};
+use rls_data::{CratePreludeData, GlobalCrateId, Import, ImportKind, SpanData,
+               Ref, RefKind, Def, DefKind, Relation, RelationKind};
 
 macro_rules! down_cast_data {
     ($id:ident, $kind:ident, $sp:expr) => {
@@ -131,7 +131,11 @@ impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
         });
 
         let data = CratePreludeData {
-            crate_name: name.into(),
+            crate_id: GlobalCrateId {
+                name: name.into(),
+                disambiguator: self.tcx.sess.local_crate_disambiguator()
+                                   .to_fingerprint().as_value(),
+            },
             crate_root: crate_root.unwrap_or("<no source>".to_owned()),
             external_crates: self.save_ctxt.get_external_crates(),
             span: self.span_from_span(krate.span),

src/librustc_save_analysis/lib.rs

@@ -63,7 +63,7 @@ use dump_visitor::DumpVisitor;
 use span_utils::SpanUtils;
 
 use rls_data::{Ref, RefKind, SpanData, MacroRef, Def, DefKind, Relation, RelationKind,
-               ExternalCrateData};
+               ExternalCrateData, GlobalCrateId};
 use rls_data::config::Config;
 
 
@@ -82,10 +82,6 @@ pub enum Data {
     RelationData(Relation),
 }
 
-macro_rules! option_try(
-    ($e:expr) => (match $e { Some(e) => e, None => return None })
-);
-
 impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
     fn span_from_span(&self, span: Span) -> SpanData {
         use rls_span::{Row, Column};
@@ -119,9 +115,13 @@ impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
             };
             let lo_loc = self.span_utils.sess.codemap().lookup_char_pos(span.lo());
             result.push(ExternalCrateData {
-                name: self.tcx.crate_name(n).to_string(),
-                num: n.as_u32(),
                 file_name: SpanUtils::make_path_string(&lo_loc.file.name),
+                num: n.as_u32(),
+                id: GlobalCrateId {
+                    name: self.tcx.crate_name(n).to_string(),
+                    disambiguator: self.tcx.crate_disambiguator(n)
+                                       .to_fingerprint().as_value(),
+                },
             });
         }
 
@@ -728,8 +728,8 @@ impl<'l, 'tcx: 'l> SaveContext<'l, 'tcx> {
         // macro uses.
         let callsite = span.source_callsite();
         let callsite_span = self.span_from_span(callsite);
-        let callee = option_try!(span.source_callee());
-        let callee_span = option_try!(callee.span);
+        let callee = span.source_callee()?;
+        let callee_span = callee.span?;
 
         // Ignore attribute macros, their spans are usually mangled
         if let MacroAttribute(_) = callee.format {