1 // Copyright 2012-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! Walks the crate looking for items/impl-items/trait-items that have
12 //! either a `rustc_symbol_name` or `rustc_item_path` attribute and
13 //! generates an error giving, respectively, the symbol name or
14 //! item-path. This is used for unit testing the code that generates
15 //! paths etc in all kinds of annoying scenarios.
18 use rustc::hir::intravisit::{self, Visitor, NestedVisitorMap};
19 use rustc::ty::TyCtxt;
22 use monomorphize::Instance;
24 const SYMBOL_NAME: &'static str = "rustc_symbol_name";
25 const ITEM_PATH: &'static str = "rustc_item_path";
27 pub fn report_symbol_names<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
28 // if the `rustc_attrs` feature is not enabled, then the
29 // attributes we are interested in cannot be present anyway, so
31 if !tcx.sess.features.borrow().rustc_attrs {
35 let _ignore = tcx.dep_graph.in_ignore();
36 let mut visitor = SymbolNamesTest { tcx: tcx };
37 // FIXME(#37712) could use ItemLikeVisitor if trait items were item-like
38 tcx.hir.krate().visit_all_item_likes(&mut visitor.as_deep_visitor());
41 struct SymbolNamesTest<'a, 'tcx:'a> {
42 tcx: TyCtxt<'a, 'tcx, 'tcx>,
45 impl<'a, 'tcx> SymbolNamesTest<'a, 'tcx> {
46 fn process_attrs(&mut self,
47 node_id: ast::NodeId) {
49 let def_id = tcx.hir.local_def_id(node_id);
50 for attr in tcx.get_attrs(def_id).iter() {
51 if attr.check_name(SYMBOL_NAME) {
52 // for now, can only use on monomorphic names
53 let instance = Instance::mono(tcx, def_id);
54 let name = self.tcx.symbol_name(instance);
55 tcx.sess.span_err(attr.span, &format!("symbol-name({})", name));
56 } else if attr.check_name(ITEM_PATH) {
57 let path = tcx.item_path_str(def_id);
58 tcx.sess.span_err(attr.span, &format!("item-path({})", path));
61 // (*) The formatting of `tag({})` is chosen so that tests can elect
62 // to test the entirety of the string, if they choose, or else just
68 impl<'a, 'tcx> Visitor<'tcx> for SymbolNamesTest<'a, 'tcx> {
69 fn nested_visit_map<'this>(&'this mut self) -> NestedVisitorMap<'this, 'tcx> {
70 NestedVisitorMap::None
73 fn visit_item(&mut self, item: &'tcx hir::Item) {
74 self.process_attrs(item.id);
75 intravisit::walk_item(self, item);
78 fn visit_trait_item(&mut self, ti: &'tcx hir::TraitItem) {
79 self.process_attrs(ti.id);
80 intravisit::walk_trait_item(self, ti)
83 fn visit_impl_item(&mut self, ii: &'tcx hir::ImplItem) {
84 self.process_attrs(ii.id);
85 intravisit::walk_impl_item(self, ii)