1 files changed, 135 insertions, 0 deletions
diff --git a/compiler/rustc_ast_passes/src/node_count.rs b/compiler/rustc_ast_passes/src/node_count.rs
new file mode 100644
index 000000000..9c7369c83
--- /dev/null
+++ b/compiler/rustc_ast_passes/src/node_count.rs
@@ -0,0 +1,135 @@
+// Simply gives a rough count of the number of nodes in an AST.
+
+use rustc_ast::visit::*;
+use rustc_ast::*;
+use rustc_span::symbol::Ident;
+use rustc_span::Span;
+
+pub struct NodeCounter {
+    pub count: usize,
+}
+
+impl NodeCounter {
+    pub fn new() -> NodeCounter {
+        NodeCounter { count: 0 }
+    }
+}
+
+impl<'ast> Visitor<'ast> for NodeCounter {
+    fn visit_ident(&mut self, _ident: Ident) {
+        self.count += 1;
+    }
+    fn visit_foreign_item(&mut self, i: &ForeignItem) {
+        self.count += 1;
+        walk_foreign_item(self, i)
+    }
+    fn visit_item(&mut self, i: &Item) {
+        self.count += 1;
+        walk_item(self, i)
+    }
+    fn visit_local(&mut self, l: &Local) {
+        self.count += 1;
+        walk_local(self, l)
+    }
+    fn visit_block(&mut self, b: &Block) {
+        self.count += 1;
+        walk_block(self, b)
+    }
+    fn visit_stmt(&mut self, s: &Stmt) {
+        self.count += 1;
+        walk_stmt(self, s)
+    }
+    fn visit_arm(&mut self, a: &Arm) {
+        self.count += 1;
+        walk_arm(self, a)
+    }
+    fn visit_pat(&mut self, p: &Pat) {
+        self.count += 1;
+        walk_pat(self, p)
+    }
+    fn visit_expr(&mut self, ex: &Expr) {
+        self.count += 1;
+        walk_expr(self, ex)
+    }
+    fn visit_ty(&mut self, t: &Ty) {
+        self.count += 1;
+        walk_ty(self, t)
+    }
+    fn visit_generic_param(&mut self, param: &GenericParam) {
+        self.count += 1;
+        walk_generic_param(self, param)
+    }
+    fn visit_generics(&mut self, g: &Generics) {
+        self.count += 1;
+        walk_generics(self, g)
+    }
+    fn visit_fn(&mut self, fk: visit::FnKind<'_>, s: Span, _: NodeId) {
+        self.count += 1;
+        walk_fn(self, fk, s)
+    }
+    fn visit_assoc_item(&mut self, ti: &AssocItem, ctxt: AssocCtxt) {
+        self.count += 1;
+        walk_assoc_item(self, ti, ctxt);
+    }
+    fn visit_trait_ref(&mut self, t: &TraitRef) {
+        self.count += 1;
+        walk_trait_ref(self, t)
+    }
+    fn visit_param_bound(&mut self, bounds: &GenericBound, _ctxt: BoundKind) {
+        self.count += 1;
+        walk_param_bound(self, bounds)
+    }
+    fn visit_poly_trait_ref(&mut self, t: &PolyTraitRef, m: &TraitBoundModifier) {
+        self.count += 1;
+        walk_poly_trait_ref(self, t, m)
+    }
+    fn visit_variant_data(&mut self, s: &VariantData) {
+        self.count += 1;
+        walk_struct_def(self, s)
+    }
+    fn visit_field_def(&mut self, s: &FieldDef) {
+        self.count += 1;
+        walk_field_def(self, s)
+    }
+    fn visit_enum_def(
+        &mut self,
+        enum_definition: &EnumDef,
+        generics: &Generics,
+        item_id: NodeId,
+        _: Span,
+    ) {
+        self.count += 1;
+        walk_enum_def(self, enum_definition, generics, item_id)
+    }
+    fn visit_variant(&mut self, v: &Variant) {
+        self.count += 1;
+        walk_variant(self, v)
+    }
+    fn visit_lifetime(&mut self, lifetime: &Lifetime, _: visit::LifetimeCtxt) {
+        self.count += 1;
+        walk_lifetime(self, lifetime)
+    }
+    fn visit_mac_call(&mut self, mac: &MacCall) {
+        self.count += 1;
+        walk_mac(self, mac)
+    }
+    fn visit_path(&mut self, path: &Path, _id: NodeId) {
+        self.count += 1;
+        walk_path(self, path)
+    }
+    fn visit_use_tree(&mut self, use_tree: &UseTree, id: NodeId, _nested: bool) {
+        self.count += 1;
+        walk_use_tree(self, use_tree, id)
+    }
+    fn visit_generic_args(&mut self, path_span: Span, generic_args: &GenericArgs) {
+        self.count += 1;
+        walk_generic_args(self, path_span, generic_args)
+    }
+    fn visit_assoc_constraint(&mut self, constraint: &AssocConstraint) {
+        self.count += 1;
+        walk_assoc_constraint(self, constraint)
+    }
+    fn visit_attribute(&mut self, _attr: &Attribute) {
+        self.count += 1;
+    }
+}