64 lines
2.0 KiB
Rust
64 lines
2.0 KiB
Rust
// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! Used by `rustc` when compiling a plugin crate.
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use syntax::ast;
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use syntax::attr;
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use errors;
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use syntax_pos::Span;
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use rustc::dep_graph::DepNode;
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use rustc::hir::map::Map;
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use rustc::hir::intravisit::Visitor;
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use rustc::hir;
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struct RegistrarFinder {
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registrars: Vec<(ast::NodeId, Span)> ,
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}
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impl<'v> Visitor<'v> for RegistrarFinder {
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fn visit_item(&mut self, item: &hir::Item) {
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if let hir::ItemFn(..) = item.node {
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if attr::contains_name(&item.attrs,
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"plugin_registrar") {
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self.registrars.push((item.id, item.span));
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}
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}
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}
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}
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/// Find the function marked with `#[plugin_registrar]`, if any.
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pub fn find_plugin_registrar(diagnostic: &errors::Handler,
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hir_map: &Map)
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-> Option<ast::NodeId> {
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let _task = hir_map.dep_graph.in_task(DepNode::PluginRegistrar);
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let krate = hir_map.krate();
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let mut finder = RegistrarFinder { registrars: Vec::new() };
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krate.visit_all_items(&mut finder);
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match finder.registrars.len() {
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0 => None,
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1 => {
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let (node_id, _) = finder.registrars.pop().unwrap();
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Some(node_id)
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},
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_ => {
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let mut e = diagnostic.struct_err("multiple plugin registration functions found");
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for &(_, span) in &finder.registrars {
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e.span_note(span, "one is here");
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}
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e.emit();
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diagnostic.abort_if_errors();
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unreachable!();
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}
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}
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}
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