+// 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.
+//
+// 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.
+
+//! Walks the crate looking for items/impl-items/trait-items that have
+//! either a `rustc_symbol_name` or `rustc_item_path` attribute and
+//! generates an error giving, respectively, the symbol name or
+//! item-path. This is used for unit testing the code that generates
+//! paths etc in all kinds of annoying scenarios.
+
+use back::symbol_names;
+use rustc::middle::ty::TyCtxt;
+use rustc_front::hir;
+use rustc_front::intravisit::{self, Visitor};
+use syntax::ast;
+use syntax::attr::AttrMetaMethods;
+use trans::common::CrateContext;
+
+const SYMBOL_NAME: &'static str = "rustc_symbol_name";
+const ITEM_PATH: &'static str = "rustc_item_path";
+
+pub fn report_symbol_names(ccx: &CrateContext) {
+ // if the `rustc_attrs` feature is not enabled, then the
+ // attributes we are interested in cannot be present anyway, so
+ // skip the walk.
+ let tcx = ccx.tcx();
+ if !tcx.sess.features.borrow().rustc_attrs {
+ return;
+ }
+
+ let _ignore = tcx.dep_graph.in_ignore();
+ let mut visitor = SymbolNamesTest { ccx: ccx, tcx: tcx };
+ tcx.map.krate().visit_all_items(&mut visitor);
+}
+
+struct SymbolNamesTest<'a, 'tcx:'a> {
+ ccx: &'a CrateContext<'a, 'tcx>,
+ tcx: &'a TyCtxt<'tcx>,
+}
+
+impl<'a, 'tcx> SymbolNamesTest<'a, 'tcx> {
+ fn process_attrs(&mut self,
+ node_id: ast::NodeId) {
+ let def_id = self.tcx.map.local_def_id(node_id);
+ for attr in self.tcx.get_attrs(def_id).iter() {
+ if attr.check_name(SYMBOL_NAME) {
+ // for now, just monomorphic names
+ let name = symbol_names::exported_name(self.ccx, def_id, &[]);
+ self.tcx.sess.span_err(attr.span, &format!("symbol-name({})", name));
+ } else if attr.check_name(ITEM_PATH) {
+ let path = self.tcx.item_path_str(def_id);
+ self.tcx.sess.span_err(attr.span, &format!("item-path({})", path));
+ }
+
+ // (*) The formatting of `tag({})` is chosen so that tests can elect
+ // to test the entirety of the string, if they choose, or else just
+ // some subset.
+ }
+ }
+}
+
+impl<'a, 'tcx> Visitor<'tcx> for SymbolNamesTest<'a, 'tcx> {
+ fn visit_item(&mut self, item: &'tcx hir::Item) {
+ self.process_attrs(item.id);
+ intravisit::walk_item(self, item);
+ }
+
+ fn visit_trait_item(&mut self, ti: &'tcx hir::TraitItem) {
+ self.process_attrs(ti.id);
+ intravisit::walk_trait_item(self, ti)
+ }
+
+ fn visit_impl_item(&mut self, ii: &'tcx hir::ImplItem) {
+ self.process_attrs(ii.id);
+ intravisit::walk_impl_item(self, ii)
+ }
+}
+