1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
//! Walks the crate looking for items/impl-items/trait-items that have
//! either a `rustc_symbol_name` or `rustc_def_path` attribute and
//! generates an error giving, respectively, the symbol name or
//! def-path. This is used for unit testing the code that generates
//! paths etc in all kinds of annoying scenarios.
use rustc::ty::{Instance, TyCtxt};
use rustc_hir as hir;
use rustc_span::symbol::{sym, Symbol};
const SYMBOL_NAME: Symbol = sym::rustc_symbol_name;
const DEF_PATH: Symbol = sym::rustc_def_path;
pub fn report_symbol_names(tcx: TyCtxt<'_>) {
// if the `rustc_attrs` feature is not enabled, then the
// attributes we are interested in cannot be present anyway, so
// skip the walk.
if !tcx.features().rustc_attrs {
return;
}
tcx.dep_graph.with_ignore(|| {
let mut visitor = SymbolNamesTest { tcx };
tcx.hir().krate().visit_all_item_likes(&mut visitor);
})
}
struct SymbolNamesTest<'tcx> {
tcx: TyCtxt<'tcx>,
}
impl SymbolNamesTest<'tcx> {
fn process_attrs(&mut self, hir_id: hir::HirId) {
let tcx = self.tcx;
let def_id = tcx.hir().local_def_id(hir_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(tcx, def_id);
let mangled = self.tcx.symbol_name(instance);
tcx.sess.span_err(attr.span, &format!("symbol-name({})", mangled));
if let Ok(demangling) = rustc_demangle::try_demangle(&mangled.name.as_str()) {
tcx.sess.span_err(attr.span, &format!("demangling({})", demangling));
tcx.sess.span_err(attr.span, &format!("demangling-alt({:#})", demangling));
}
} else if attr.check_name(DEF_PATH) {
let path = tcx.def_path_str(def_id);
tcx.sess.span_err(attr.span, &format!("def-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 hir::itemlikevisit::ItemLikeVisitor<'tcx> for SymbolNamesTest<'tcx> {
fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
self.process_attrs(item.hir_id);
}
fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>) {
self.process_attrs(trait_item.hir_id);
}
fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) {
self.process_attrs(impl_item.hir_id);
}
}
|
