Auto merge of #38479 - michaelwoerister:extern_mod_ich, r=nikomatsakis

ICH: Fix and test foreign mod hashing.

r? @nikomatsakis

src/librustc/hir/intravisit.rs

@@ -264,6 +264,9 @@ pub trait Visitor<'v> : Sized {
     fn visit_where_predicate(&mut self, predicate: &'v WherePredicate) {
         walk_where_predicate(self, predicate)
     }
+    fn visit_fn_decl(&mut self, fd: &'v FnDecl) {
+        walk_fn_decl(self, fd)
+    }
     fn visit_fn(&mut self, fk: FnKind<'v>, fd: &'v FnDecl, b: ExprId, s: Span, id: NodeId) {
         walk_fn(self, fk, fd, b, s, id)
     }
@@ -531,7 +534,7 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
             walk_list!(visitor, visit_ty, tuple_element_types);
         }
         TyBareFn(ref function_declaration) => {
-            walk_fn_decl(visitor, &function_declaration.decl);
+            visitor.visit_fn_decl(&function_declaration.decl);
             walk_list!(visitor, visit_lifetime_def, &function_declaration.lifetimes);
         }
         TyPath(ref qpath) => {
@@ -660,7 +663,7 @@ pub fn walk_foreign_item<'v, V: Visitor<'v>>(visitor: &mut V, foreign_item: &'v
 
     match foreign_item.node {
         ForeignItemFn(ref function_declaration, ref generics) => {
-            walk_fn_decl(visitor, function_declaration);
+            visitor.visit_fn_decl(function_declaration);
             visitor.visit_generics(generics)
         }
         ForeignItemStatic(ref typ, _) => visitor.visit_ty(typ),
@@ -764,7 +767,7 @@ pub fn walk_fn<'v, V: Visitor<'v>>(visitor: &mut V,
                                    _span: Span,
                                    id: NodeId) {
     visitor.visit_id(id);
-    walk_fn_decl(visitor, function_declaration);
+    visitor.visit_fn_decl(function_declaration);
     walk_fn_kind(visitor, function_kind);
     visitor.visit_body(body_id)
 }
@@ -776,7 +779,7 @@ pub fn walk_fn_with_body<'v, V: Visitor<'v>>(visitor: &mut V,
                                              _span: Span,
                                              id: NodeId) {
     visitor.visit_id(id);
-    walk_fn_decl(visitor, function_declaration);
+    visitor.visit_fn_decl(function_declaration);
     walk_fn_kind(visitor, function_kind);
     visitor.visit_expr(body)
 }
@@ -793,7 +796,7 @@ pub fn walk_trait_item<'v, V: Visitor<'v>>(visitor: &mut V, trait_item: &'v Trai
         MethodTraitItem(ref sig, None) => {
             visitor.visit_id(trait_item.id);
             visitor.visit_generics(&sig.generics);
-            walk_fn_decl(visitor, &sig.decl);
+            visitor.visit_fn_decl(&sig.decl);
         }
         MethodTraitItem(ref sig, Some(body_id)) => {
             visitor.visit_fn(FnKind::Method(trait_item.name,

src/librustc_incremental/calculate_svh/mod.rs

@@ -238,9 +238,4 @@ impl<'a, 'tcx> Visitor<'tcx> for HashItemsVisitor<'a, 'tcx> {
         self.calculate_node_id(impl_item.id, |v| v.visit_impl_item(impl_item));
         visit::walk_impl_item(self, impl_item);
     }
-
-    fn visit_foreign_item(&mut self, item: &'tcx hir::ForeignItem) {
-        self.calculate_node_id(item.id, |v| v.visit_foreign_item(item));
-        visit::walk_foreign_item(self, item);
-    }
 }

src/librustc_incremental/calculate_svh/svh_visitor.rs

@@ -180,9 +180,10 @@ enum SawAbiComponent<'a> {
     SawLifetimeDef(usize),
 
     SawMod,
-    SawForeignItem,
+    SawForeignItem(SawForeignItemComponent),
     SawItem(SawItemComponent),
     SawTy(SawTyComponent),
+    SawFnDecl(bool),
     SawGenerics,
     SawTraitItem(SawTraitOrImplItemComponent),
     SawImplItem(SawTraitOrImplItemComponent),
@@ -363,7 +364,7 @@ enum SawItemComponent {
     SawItemConst,
     SawItemFn(Unsafety, Constness, Abi),
     SawItemMod,
-    SawItemForeignMod,
+    SawItemForeignMod(Abi),
     SawItemTy,
     SawItemEnum,
     SawItemStruct,
@@ -381,7 +382,7 @@ fn saw_item(node: &Item_) -> SawItemComponent {
         ItemConst(..) =>SawItemConst,
         ItemFn(_, unsafety, constness, abi, _, _) => SawItemFn(unsafety, constness, abi),
         ItemMod(..) => SawItemMod,
-        ItemForeignMod(..) => SawItemForeignMod,
+        ItemForeignMod(ref fm) => SawItemForeignMod(fm.abi),
         ItemTy(..) => SawItemTy,
         ItemEnum(..) => SawItemEnum,
         ItemStruct(..) => SawItemStruct,
@@ -392,6 +393,12 @@ fn saw_item(node: &Item_) -> SawItemComponent {
     }
 }
 
+#[derive(Hash)]
+enum SawForeignItemComponent {
+    Static { mutable: bool },
+    Fn,
+}
+
 #[derive(Hash)]
 enum SawPatComponent {
     SawPatWild,
@@ -641,7 +648,17 @@ impl<'a, 'hash, 'tcx> visit::Visitor<'tcx> for StrictVersionHashVisitor<'a, 'has
     fn visit_foreign_item(&mut self, i: &'tcx ForeignItem) {
         debug!("visit_foreign_item: st={:?}", self.st);
 
-        SawForeignItem.hash(self.st);
+        match i.node {
+            ForeignItemFn(..) => {
+                SawForeignItem(SawForeignItemComponent::Fn)
+            }
+            ForeignItemStatic(_, mutable) => {
+                SawForeignItem(SawForeignItemComponent::Static {
+                    mutable: mutable
+                })
+            }
+        }.hash(self.st);
+
         hash_span!(self, i.span);
         hash_attrs!(self, &i.attrs);
         visit::walk_foreign_item(self, i)
@@ -678,6 +695,12 @@ impl<'a, 'hash, 'tcx> visit::Visitor<'tcx> for StrictVersionHashVisitor<'a, 'has
         visit::walk_generics(self, g)
     }
 
+    fn visit_fn_decl(&mut self, fd: &'tcx FnDecl) {
+        debug!("visit_fn_decl: st={:?}", self.st);
+        SawFnDecl(fd.variadic).hash(self.st);
+        visit::walk_fn_decl(self, fd)
+    }
+
     fn visit_trait_item(&mut self, ti: &'tcx TraitItem) {
         debug!("visit_trait_item: st={:?}", self.st);