diff options
Diffstat (limited to 'compiler/rustc_passes/src/lang_items.rs')
| -rw-r--r-- | compiler/rustc_passes/src/lang_items.rs | 211 |
1 files changed, 94 insertions, 117 deletions
diff --git a/compiler/rustc_passes/src/lang_items.rs b/compiler/rustc_passes/src/lang_items.rs index 79900a90a..df811be2a 100644 --- a/compiler/rustc_passes/src/lang_items.rs +++ b/compiler/rustc_passes/src/lang_items.rs @@ -8,9 +8,11 @@ //! * Functions called by the compiler itself. use crate::check_attr::target_from_impl_item; +use crate::errors::{ + DuplicateLangItem, IncorrectTarget, LangItemOnIncorrectTarget, UnknownLangItem, +}; use crate::weak_lang_items; -use rustc_errors::{pluralize, struct_span_err}; use rustc_hir as hir; use rustc_hir::def::DefKind; use rustc_hir::def_id::DefId; @@ -18,10 +20,16 @@ use rustc_hir::lang_items::{extract, GenericRequirement, ITEM_REFS}; use rustc_hir::{HirId, LangItem, LanguageItems, Target}; use rustc_middle::ty::TyCtxt; use rustc_session::cstore::ExternCrate; -use rustc_span::Span; +use rustc_span::{symbol::kw::Empty, Span}; use rustc_middle::ty::query::Providers; +pub(crate) enum Duplicate { + Plain, + Crate, + CrateDepends, +} + struct LanguageItemCollector<'tcx> { items: LanguageItems, tcx: TyCtxt<'tcx>, @@ -34,42 +42,24 @@ impl<'tcx> LanguageItemCollector<'tcx> { fn check_for_lang(&mut self, actual_target: Target, hir_id: HirId) { let attrs = self.tcx.hir().attrs(hir_id); - if let Some((value, span)) = extract(&attrs) { - match ITEM_REFS.get(&value).cloned() { + if let Some((name, span)) = extract(&attrs) { + match ITEM_REFS.get(&name).cloned() { // Known lang item with attribute on correct target. Some((item_index, expected_target)) if actual_target == expected_target => { self.collect_item_extended(item_index, hir_id, span); } // Known lang item with attribute on incorrect target. Some((_, expected_target)) => { - struct_span_err!( - self.tcx.sess, + self.tcx.sess.emit_err(LangItemOnIncorrectTarget { span, - E0718, - "`{}` language item must be applied to a {}", - value, + name, expected_target, - ) - .span_label( - span, - format!( - "attribute should be applied to a {}, not a {}", - expected_target, actual_target, - ), - ) - .emit(); + actual_target, + }); } // Unknown lang item. _ => { - struct_span_err!( - self.tcx.sess, - span, - E0522, - "definition of an unknown language item: `{}`", - value - ) - .span_label(span, format!("definition of unknown language item `{}`", value)) - .emit(); + self.tcx.sess.emit_err(UnknownLangItem { span, name }); } } } @@ -79,74 +69,72 @@ impl<'tcx> LanguageItemCollector<'tcx> { // Check for duplicates. if let Some(original_def_id) = self.items.items[item_index] { if original_def_id != item_def_id { - let lang_item = LangItem::from_u32(item_index as u32).unwrap(); - let name = lang_item.name(); - let mut err = match self.tcx.hir().span_if_local(item_def_id) { - Some(span) => struct_span_err!( - self.tcx.sess, - span, - E0152, - "found duplicate lang item `{}`", - name - ), - None => match self.tcx.extern_crate(item_def_id) { - Some(ExternCrate { dependency_of, .. }) => { - self.tcx.sess.struct_err(&format!( - "duplicate lang item in crate `{}` (which `{}` depends on): `{}`.", - self.tcx.crate_name(item_def_id.krate), - self.tcx.crate_name(*dependency_of), - name - )) - } - _ => self.tcx.sess.struct_err(&format!( - "duplicate lang item in crate `{}`: `{}`.", - self.tcx.crate_name(item_def_id.krate), - name - )), - }, + let local_span = self.tcx.hir().span_if_local(item_def_id); + let lang_item_name = LangItem::from_u32(item_index as u32).unwrap().name(); + let crate_name = self.tcx.crate_name(item_def_id.krate); + let mut dependency_of = Empty; + let is_local = item_def_id.is_local(); + let path = if is_local { + String::new() + } else { + self.tcx + .crate_extern_paths(item_def_id.krate) + .iter() + .map(|p| p.display().to_string()) + .collect::<Vec<_>>() + .join(", ") + .into() }; - if let Some(span) = self.tcx.hir().span_if_local(original_def_id) { - err.span_note(span, "the lang item is first defined here"); + let first_defined_span = self.tcx.hir().span_if_local(original_def_id); + let mut orig_crate_name = Empty; + let mut orig_dependency_of = Empty; + let orig_is_local = original_def_id.is_local(); + let orig_path = if orig_is_local { + String::new() } else { - match self.tcx.extern_crate(original_def_id) { - Some(ExternCrate { dependency_of, .. }) => { - err.note(&format!( - "the lang item is first defined in crate `{}` (which `{}` depends on)", - self.tcx.crate_name(original_def_id.krate), - self.tcx.crate_name(*dependency_of) - )); - } - _ => { - err.note(&format!( - "the lang item is first defined in crate `{}`.", - self.tcx.crate_name(original_def_id.krate) - )); - } + self.tcx + .crate_extern_paths(original_def_id.krate) + .iter() + .map(|p| p.display().to_string()) + .collect::<Vec<_>>() + .join(", ") + .into() + }; + if first_defined_span.is_none() { + orig_crate_name = self.tcx.crate_name(original_def_id.krate); + if let Some(ExternCrate { dependency_of: inner_dependency_of, .. }) = + self.tcx.extern_crate(original_def_id) + { + orig_dependency_of = self.tcx.crate_name(*inner_dependency_of); } - let mut note_def = |which, def_id: DefId| { - let crate_name = self.tcx.crate_name(def_id.krate); - let note = if def_id.is_local() { - format!("{} definition in the local crate (`{}`)", which, crate_name) - } else { - let paths: Vec<_> = self - .tcx - .crate_extern_paths(def_id.krate) - .iter() - .map(|p| p.display().to_string()) - .collect(); - format!( - "{} definition in `{}` loaded from {}", - which, - crate_name, - paths.join(", ") - ) - }; - err.note(¬e); - }; - note_def("first", original_def_id); - note_def("second", item_def_id); } - err.emit(); + + let duplicate = if local_span.is_some() { + Duplicate::Plain + } else { + match self.tcx.extern_crate(item_def_id) { + Some(ExternCrate { dependency_of: inner_dependency_of, .. }) => { + dependency_of = self.tcx.crate_name(*inner_dependency_of); + Duplicate::CrateDepends + } + _ => Duplicate::Crate, + } + }; + + self.tcx.sess.emit_err(DuplicateLangItem { + local_span, + lang_item_name, + crate_name, + dependency_of, + is_local, + path, + first_defined_span, + orig_crate_name, + orig_dependency_of, + orig_is_local, + orig_path, + duplicate, + }); } } @@ -179,41 +167,30 @@ impl<'tcx> LanguageItemCollector<'tcx> { None => (0, *item_span), }; + let mut at_least = false; let required = match lang_item.required_generics() { - GenericRequirement::Exact(num) if num != actual_num => { - Some((format!("{}", num), pluralize!(num))) - } + GenericRequirement::Exact(num) if num != actual_num => Some(num), GenericRequirement::Minimum(num) if actual_num < num => { - Some((format!("at least {}", num), pluralize!(num))) - } + at_least = true; + Some(num)} + , // If the number matches, or there is no requirement, handle it normally _ => None, }; - if let Some((range_str, pluralized)) = required { + if let Some(num) = required { // We are issuing E0718 "incorrect target" here, because while the // item kind of the target is correct, the target is still wrong // because of the wrong number of generic arguments. - struct_span_err!( - self.tcx.sess, + self.tcx.sess.emit_err(IncorrectTarget { span, - E0718, - "`{}` language item must be applied to a {} with {} generic argument{}", - name, - kind.descr(), - range_str, - pluralized, - ) - .span_label( generics_span, - format!( - "this {} has {} generic argument{}", - kind.descr(), - actual_num, - pluralize!(actual_num), - ), - ) - .emit(); + name: name.as_str(), + kind: kind.descr(), + num, + actual_num, + at_least, + }); // return early to not collect the lang item return; @@ -240,9 +217,9 @@ fn get_lang_items(tcx: TyCtxt<'_>, (): ()) -> LanguageItems { let crate_items = tcx.hir_crate_items(()); for id in crate_items.items() { - collector.check_for_lang(Target::from_def_kind(tcx.def_kind(id.def_id)), id.hir_id()); + collector.check_for_lang(Target::from_def_kind(tcx.def_kind(id.owner_id)), id.hir_id()); - if matches!(tcx.def_kind(id.def_id), DefKind::Enum) { + if matches!(tcx.def_kind(id.owner_id), DefKind::Enum) { let item = tcx.hir().item(id); if let hir::ItemKind::Enum(def, ..) = &item.kind { for variant in def.variants { |