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// 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 rustc::hir;
use rustc::hir::intravisit::{self, Visitor};
use syntax::ast;
use syntax::attr::AttrMetaMethods;
use common::SharedCrateContext;
use monomorphize::Instance;
const SYMBOL_NAME: &'static str = "rustc_symbol_name";
const ITEM_PATH: &'static str = "rustc_item_path";
pub fn report_symbol_names(scx: &SharedCrateContext) {
// 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 = scx.tcx();
if !tcx.sess.features.borrow().rustc_attrs {
return;
}
let _ignore = tcx.dep_graph.in_ignore();
let mut visitor = SymbolNamesTest { scx: scx };
tcx.map.krate().visit_all_items(&mut visitor);
}
struct SymbolNamesTest<'a, 'tcx:'a> {
scx: &'a SharedCrateContext<'a, 'tcx>,
}
impl<'a, 'tcx> SymbolNamesTest<'a, 'tcx> {
fn process_attrs(&mut self,
node_id: ast::NodeId) {
let tcx = self.scx.tcx();
let def_id = tcx.map.local_def_id(node_id);
for attr in tcx.get_attrs(def_id).iter() {
if attr.check_name(SYMBOL_NAME) {
// for now, can only use on monomorphic names
let instance = Instance::mono(self.scx, def_id);
let name = instance.symbol_name(self.scx);
tcx.sess.span_err(attr.span, &format!("symbol-name({})", name));
} else if attr.check_name(ITEM_PATH) {
let path = tcx.item_path_str(def_id);
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)
}
}
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