71 lines
2.6 KiB
Rust
71 lines
2.6 KiB
Rust
//! Walks the crate looking for items/impl-items/trait-items that have
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//! either a `rustc_symbol_name` or `rustc_def_path` attribute and
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//! generates an error giving, respectively, the symbol name or
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//! def-path. This is used for unit testing the code that generates
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//! paths etc in all kinds of annoying scenarios.
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use rustc::ty::{Instance, TyCtxt};
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use rustc_hir as hir;
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use rustc_span::symbol::{sym, Symbol};
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const SYMBOL_NAME: Symbol = sym::rustc_symbol_name;
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const DEF_PATH: Symbol = sym::rustc_def_path;
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pub fn report_symbol_names(tcx: TyCtxt<'_>) {
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// if the `rustc_attrs` feature is not enabled, then the
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// attributes we are interested in cannot be present anyway, so
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// skip the walk.
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if !tcx.features().rustc_attrs {
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return;
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}
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tcx.dep_graph.with_ignore(|| {
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let mut visitor = SymbolNamesTest { tcx };
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tcx.hir().krate().visit_all_item_likes(&mut visitor);
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})
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}
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struct SymbolNamesTest<'tcx> {
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tcx: TyCtxt<'tcx>,
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}
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impl SymbolNamesTest<'tcx> {
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fn process_attrs(&mut self, hir_id: hir::HirId) {
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let tcx = self.tcx;
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let def_id = tcx.hir().local_def_id(hir_id);
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for attr in tcx.get_attrs(def_id).iter() {
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if attr.check_name(SYMBOL_NAME) {
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// for now, can only use on monomorphic names
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let instance = Instance::mono(tcx, def_id);
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let mangled = self.tcx.symbol_name(instance);
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tcx.sess.span_err(attr.span, &format!("symbol-name({})", mangled));
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if let Ok(demangling) = rustc_demangle::try_demangle(&mangled.name.as_str()) {
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tcx.sess.span_err(attr.span, &format!("demangling({})", demangling));
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tcx.sess.span_err(attr.span, &format!("demangling-alt({:#})", demangling));
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}
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} else if attr.check_name(DEF_PATH) {
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let path = tcx.def_path_str(def_id);
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tcx.sess.span_err(attr.span, &format!("def-path({})", path));
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}
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// (*) The formatting of `tag({})` is chosen so that tests can elect
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// to test the entirety of the string, if they choose, or else just
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// some subset.
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}
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}
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}
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impl hir::itemlikevisit::ItemLikeVisitor<'tcx> for SymbolNamesTest<'tcx> {
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fn visit_item(&mut self, item: &'tcx hir::Item<'tcx>) {
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self.process_attrs(item.hir_id);
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}
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fn visit_trait_item(&mut self, trait_item: &'tcx hir::TraitItem<'tcx>) {
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self.process_attrs(trait_item.hir_id);
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}
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fn visit_impl_item(&mut self, impl_item: &'tcx hir::ImplItem<'tcx>) {
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self.process_attrs(impl_item.hir_id);
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}
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}
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