1 // Copyright 2012-2013 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 //! Used by `rustc` when compiling a plugin crate.
17 use rustc::hir::map::Map;
18 use rustc::hir::itemlikevisit::ItemLikeVisitor;
21 struct RegistrarFinder {
22 registrars: Vec<(ast::NodeId, Span)> ,
25 impl<'v> ItemLikeVisitor<'v> for RegistrarFinder {
26 fn visit_item(&mut self, item: &hir::Item) {
27 if let hir::ItemKind::Fn(..) = item.node {
28 if attr::contains_name(&item.attrs,
30 self.registrars.push((item.id, item.span));
35 fn visit_trait_item(&mut self, _trait_item: &hir::TraitItem) {
38 fn visit_impl_item(&mut self, _impl_item: &hir::ImplItem) {
42 /// Find the function marked with `#[plugin_registrar]`, if any.
43 pub fn find_plugin_registrar(diagnostic: &errors::Handler,
45 -> Option<ast::NodeId> {
46 let krate = hir_map.krate();
48 let mut finder = RegistrarFinder { registrars: Vec::new() };
49 krate.visit_all_item_likes(&mut finder);
51 match finder.registrars.len() {
54 let (node_id, _) = finder.registrars.pop().unwrap();
58 let mut e = diagnostic.struct_err("multiple plugin registration functions found");
59 for &(_, span) in &finder.registrars {
60 e.span_note(span, "one is here");
63 diagnostic.abort_if_errors();