diff --git a/crates/ra_hir/src/code_model_api.rs b/crates/ra_hir/src/code_model_api.rs index 92ab0f6922..a58bf8f87b 100644 --- a/crates/ra_hir/src/code_model_api.rs +++ b/crates/ra_hir/src/code_model_api.rs @@ -134,7 +134,7 @@ impl Module { } /// Returns the crate this module is part of. - pub fn krate(&self, _db: &impl HirDatabase) -> Option { + pub fn krate(&self, _db: &impl PersistentHirDatabase) -> Option { Some(self.krate) } diff --git a/crates/ra_hir/src/nameres.rs b/crates/ra_hir/src/nameres.rs index 04cc693b37..68df083d8c 100644 --- a/crates/ra_hir/src/nameres.rs +++ b/crates/ra_hir/src/nameres.rs @@ -34,6 +34,7 @@ use crate::{ /// module, the set of visible items. #[derive(Default, Debug, PartialEq, Eq)] pub struct ItemMap { + extern_prelude: FxHashMap, per_module: ArenaMap, } @@ -204,6 +205,7 @@ where } pub(crate) fn resolve(mut self) -> ItemMap { + self.populate_extern_prelude(); for (&module_id, items) in self.input.iter() { self.populate_module(module_id, Arc::clone(items)); } @@ -227,29 +229,19 @@ where self.result } + fn populate_extern_prelude(&mut self) { + for dep in self.krate.dependencies(self.db) { + log::debug!("crate dep {:?} -> {:?}", dep.name, dep.krate); + if let Some(module) = dep.krate.root_module(self.db) { + self.result + .extern_prelude + .insert(dep.name.clone(), module.into()); + } + } + } + fn populate_module(&mut self, module_id: ModuleId, input: Arc) { let mut module_items = ModuleScope::default(); - - // Populate extern crates prelude - { - let root_id = module_id.crate_root(&self.module_tree); - let file_id = root_id.file_id(&self.module_tree); - let crate_graph = self.db.crate_graph(); - if let Some(crate_id) = crate_graph.crate_id_for_crate_root(file_id.as_original_file()) - { - let krate = Crate { crate_id }; - for dep in krate.dependencies(self.db) { - if let Some(module) = dep.krate.root_module(self.db) { - let def = module.into(); - self.add_module_item( - &mut module_items, - dep.name.clone(), - PerNs::types(def), - ); - } - } - }; - } for (import_id, import_data) in input.imports.iter() { if let Some(last_segment) = import_data.path.segments.iter().last() { if !import_data.is_glob { @@ -327,7 +319,16 @@ where .alias .clone() .unwrap_or_else(|| last_segment.name.clone()); - log::debug!("resolved import {:?} ({:?}) to {:?}", name, import, def,); + log::debug!("resolved import {:?} ({:?}) to {:?}", name, import, def); + + // extern crates in the crate root are special-cased to insert entries into the extern prelude: rust-lang/rust#54658 + if let Some(root_module) = self.krate.root_module(self.db) { + if import.is_extern_crate && module_id == root_module.module_id { + if let Some(def) = def.take_types() { + self.result.extern_prelude.insert(name.clone(), def); + } + } + } self.update(module_id, |items| { let res = Resolution { def, @@ -389,24 +390,53 @@ impl ItemMap { original_module: Module, path: &Path, ) -> (PerNs, ReachedFixedPoint) { - let mut curr_per_ns: PerNs = PerNs::types(match path.kind { - PathKind::Crate => original_module.crate_root(db).into(), - PathKind::Self_ | PathKind::Plain => original_module.into(), + let mut segments = path.segments.iter().enumerate(); + let mut curr_per_ns: PerNs = match path.kind { + PathKind::Crate => PerNs::types(original_module.crate_root(db).into()), + PathKind::Self_ => PerNs::types(original_module.into()), + PathKind::Plain => { + let segment = match segments.next() { + Some((_, segment)) => segment, + None => return (PerNs::none(), ReachedFixedPoint::Yes), + }; + // Resolve in: + // - current module / scope + // - extern prelude + match self[original_module.module_id].items.get(&segment.name) { + Some(res) if !res.def.is_none() => res.def, + _ => { + if let Some(def) = self.extern_prelude.get(&segment.name) { + PerNs::types(*def) + } else { + return (PerNs::none(), ReachedFixedPoint::No); + } + } + } + } PathKind::Super => { if let Some(p) = original_module.parent(db) { - p.into() + PerNs::types(p.into()) } else { log::debug!("super path in root module"); return (PerNs::none(), ReachedFixedPoint::Yes); } } PathKind::Abs => { - // TODO: absolute use is not supported - return (PerNs::none(), ReachedFixedPoint::Yes); + // 2018-style absolute path -- only extern prelude + let segment = match segments.next() { + Some((_, segment)) => segment, + None => return (PerNs::none(), ReachedFixedPoint::Yes), + }; + if let Some(def) = self.extern_prelude.get(&segment.name) { + log::debug!("absolute path {:?} resolved to crate {:?}", path, def); + PerNs::types(*def) + } else { + return (PerNs::none(), ReachedFixedPoint::Yes); + } } - }); + }; - for (i, segment) in path.segments.iter().enumerate() { + for (i, segment) in segments { let curr = match curr_per_ns.as_ref().take_types() { Some(r) => r, None => { diff --git a/crates/ra_hir/src/nameres/lower.rs b/crates/ra_hir/src/nameres/lower.rs index db898a782f..7e6e48ae00 100644 --- a/crates/ra_hir/src/nameres/lower.rs +++ b/crates/ra_hir/src/nameres/lower.rs @@ -23,6 +23,7 @@ pub(super) struct ImportData { pub(super) path: Path, pub(super) alias: Option, pub(super) is_glob: bool, + pub(super) is_extern_crate: bool, } /// A set of items and imports declared inside a module, without relation to @@ -199,6 +200,7 @@ impl LoweredModule { path, alias, is_glob: false, + is_extern_crate: true, }); } } @@ -228,6 +230,7 @@ impl LoweredModule { path, alias, is_glob: segment.is_none(), + is_extern_crate: false, }); if let Some(segment) = segment { source_map.insert(import, segment) diff --git a/crates/ra_hir/src/nameres/tests.rs b/crates/ra_hir/src/nameres/tests.rs index 42c59f76f0..0654dbaa13 100644 --- a/crates/ra_hir/src/nameres/tests.rs +++ b/crates/ra_hir/src/nameres/tests.rs @@ -329,7 +329,6 @@ fn item_map_across_crates() { module.module_id, " Baz: t v - test_crate: t ", ); } @@ -342,7 +341,9 @@ fn extern_crate_rename() { extern crate alloc as alloc_crate; mod alloc; + mod sync; + //- /sync.rs use alloc_crate::Arc; //- /lib.rs @@ -350,6 +351,7 @@ fn extern_crate_rename() { ", ); let main_id = sr.files[RelativePath::new("/main.rs")]; + let sync_id = sr.files[RelativePath::new("/sync.rs")]; let lib_id = sr.files[RelativePath::new("/lib.rs")]; let mut crate_graph = CrateGraph::default(); @@ -361,7 +363,7 @@ fn extern_crate_rename() { db.set_crate_graph(Arc::new(crate_graph)); - let module = crate::source_binder::module_from_file_id(&db, main_id).unwrap(); + let module = crate::source_binder::module_from_file_id(&db, sync_id).unwrap(); let krate = module.krate(&db).unwrap(); let item_map = db.item_map(krate); @@ -370,8 +372,6 @@ fn extern_crate_rename() { module.module_id, " Arc: t v - alloc: t - alloc_crate: t ", ); } @@ -403,8 +403,6 @@ fn import_across_source_roots() { let main_id = sr2.files[RelativePath::new("/main.rs")]; - eprintln!("lib = {:?}, main = {:?}", lib_id, main_id); - let mut crate_graph = CrateGraph::default(); let main_crate = crate_graph.add_crate_root(main_id); let lib_crate = crate_graph.add_crate_root(lib_id); @@ -423,7 +421,6 @@ fn import_across_source_roots() { module.module_id, " C: t v - test_crate: t ", ); } @@ -465,7 +462,6 @@ fn reexport_across_crates() { module.module_id, " Baz: t v - test_crate: t ", ); }