75 lines
2.7 KiB
Rust
75 lines
2.7 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_hir::def_id::LocalDefId;
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use rustc_middle::ty::print::with_no_trimmed_paths;
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use rustc_middle::ty::{subst::InternalSubsts, Instance, TyCtxt};
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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 symbol_names = SymbolNamesTest { tcx };
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let crate_items = tcx.hir_crate_items(());
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for id in crate_items.items() {
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symbol_names.process_attrs(id.def_id);
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}
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for id in crate_items.trait_items() {
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symbol_names.process_attrs(id.def_id);
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}
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for id in crate_items.impl_items() {
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symbol_names.process_attrs(id.def_id);
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}
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for id in crate_items.foreign_items() {
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symbol_names.process_attrs(id.def_id);
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}
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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<'_> {
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fn process_attrs(&mut self, def_id: LocalDefId) {
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let tcx = self.tcx;
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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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for attr in tcx.get_attrs(def_id.to_def_id(), SYMBOL_NAME) {
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let def_id = def_id.to_def_id();
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let instance = Instance::new(
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def_id,
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tcx.erase_regions(InternalSubsts::identity_for_item(tcx, def_id)),
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);
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let mangled = 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) {
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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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}
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for attr in tcx.get_attrs(def_id.to_def_id(), DEF_PATH) {
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let path = with_no_trimmed_paths!(tcx.def_path_str(def_id.to_def_id()));
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tcx.sess.span_err(attr.span, &format!("def-path({})", path));
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}
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}
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}
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