10 files changed, 103 insertions, 117 deletions

diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index cb990f4e2..f436d5d5e 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -10,8 +10,9 @@ use hir_def::{
     adt::VariantData,
     body::scope::ExprScopes,
     builtin_type::BuiltinType,
+    traits::TraitData,
     type_ref::{Mutability, TypeRef},
-    CrateModuleId, ImplId, LocalEnumVariantId, LocalStructFieldId, ModuleId, UnionId,
+    AssocItemId, CrateModuleId, ImplId, LocalEnumVariantId, LocalStructFieldId, ModuleId, UnionId,
 };
 use hir_expand::{
     diagnostics::DiagnosticSink,
@@ -30,7 +31,6 @@ use crate::{
         TypeAliasId,
     },
     resolve::{Resolver, Scope, TypeNs},
-    traits::TraitData,
     ty::{InferenceResult, Namespace, TraitRef},
     Either, HasSource, ImportId, Name, ScopeDef, Source, Ty,
 };
@@ -230,15 +230,7 @@ impl Module {
 
     pub fn declarations(self, db: &impl DefDatabase) -> Vec<ModuleDef> {
         let def_map = db.crate_def_map(self.id.krate);
-        def_map[self.id.module_id]
-            .scope
-            .entries()
-            .filter_map(|(_name, res)| if res.import.is_none() { Some(res.def) } else { None })
-            .flat_map(|per_ns| {
-                per_ns.take_types().into_iter().chain(per_ns.take_values().into_iter())
-            })
-            .map(ModuleDef::from)
-            .collect()
+        def_map[self.id.module_id].scope.declarations().map(ModuleDef::from).collect()
     }
 
     pub fn impl_blocks(self, db: &impl DefDatabase) -> Vec<ImplBlock> {
@@ -693,7 +685,7 @@ impl Function {
 
     /// The containing trait, if this is a trait method definition.
     pub fn parent_trait(self, db: &impl DefDatabase) -> Option<Trait> {
-        db.trait_items_index(self.module(db)).get_parent_trait(self.into())
+        db.trait_items_index(self.module(db).id).get_parent_trait(self.id.into()).map(Trait::from)
     }
 
     pub fn container(self, db: &impl DefDatabase) -> Option<Container> {
@@ -757,7 +749,7 @@ impl Const {
     }
 
     pub fn parent_trait(self, db: &impl DefDatabase) -> Option<Trait> {
-        db.trait_items_index(self.module(db)).get_parent_trait(self.into())
+        db.trait_items_index(self.module(db).id).get_parent_trait(self.id.into()).map(Trait::from)
     }
 
     pub fn container(self, db: &impl DefDatabase) -> Option<Container> {
@@ -861,11 +853,11 @@ impl Trait {
     }
 
     pub fn name(self, db: &impl DefDatabase) -> Option<Name> {
-        self.trait_data(db).name().clone()
+        self.trait_data(db).name.clone()
     }
 
     pub fn items(self, db: &impl DefDatabase) -> Vec<AssocItem> {
-        self.trait_data(db).items().to_vec()
+        self.trait_data(db).items.iter().map(|it| (*it).into()).collect()
     }
 
     fn direct_super_traits(self, db: &impl HirDatabase) -> Vec<Trait> {
@@ -912,10 +904,10 @@ impl Trait {
     pub fn associated_type_by_name(self, db: &impl DefDatabase, name: &Name) -> Option<TypeAlias> {
         let trait_data = self.trait_data(db);
         trait_data
-            .items()
+            .items
             .iter()
             .filter_map(|item| match item {
-                AssocItem::TypeAlias(t) => Some(*t),
+                AssocItemId::TypeAliasId(t) => Some(TypeAlias::from(*t)),
                 _ => None,
             })
             .find(|t| &t.name(db) == name)
@@ -930,7 +922,7 @@ impl Trait {
     }
 
     pub(crate) fn trait_data(self, db: &impl DefDatabase) -> Arc<TraitData> {
-        db.trait_data(self)
+        db.trait_data(self.id)
     }
 
     pub fn trait_ref(self, db: &impl HirDatabase) -> TraitRef {
@@ -938,7 +930,7 @@ impl Trait {
     }
 
     pub fn is_auto(self, db: &impl DefDatabase) -> bool {
-        self.trait_data(db).is_auto()
+        self.trait_data(db).auto
     }
 
     pub(crate) fn resolver(self, db: &impl DefDatabase) -> Resolver {
@@ -971,7 +963,7 @@ impl TypeAlias {
 
     /// The containing trait, if this is a trait method definition.
     pub fn parent_trait(self, db: &impl DefDatabase) -> Option<Trait> {
-        db.trait_items_index(self.module(db)).get_parent_trait(self.into())
+        db.trait_items_index(self.module(db).id).get_parent_trait(self.id.into()).map(Trait::from)
     }
 
     pub fn container(self, db: &impl DefDatabase) -> Option<Container> {
diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs
index 0d35014a0..73859e1e9 100644
--- a/crates/ra_hir/src/db.rs
+++ b/crates/ra_hir/src/db.rs
@@ -11,7 +11,6 @@ use crate::{
     generics::{GenericDef, GenericParams},
     ids,
     lang_item::{LangItemTarget, LangItems},
-    traits::TraitData,
     ty::{
         method_resolution::CrateImplBlocks,
         traits::{AssocTyValue, Impl},
@@ -26,7 +25,8 @@ use crate::{
 pub use hir_def::db::{
     BodyQuery, BodyWithSourceMapQuery, CrateDefMapQuery, DefDatabase2, DefDatabase2Storage,
     EnumDataQuery, ExprScopesQuery, ImplDataQuery, InternDatabase, InternDatabaseStorage,
-    RawItemsQuery, RawItemsWithSourceMapQuery, StructDataQuery,
+    RawItemsQuery, RawItemsWithSourceMapQuery, StructDataQuery, TraitDataQuery,
+    TraitItemsIndexQuery,
 };
 pub use hir_expand::db::{
     AstDatabase, AstDatabaseStorage, AstIdMapQuery, MacroArgQuery, MacroDefQuery, MacroExpandQuery,
@@ -37,12 +37,6 @@ pub use hir_expand::db::{
 #[salsa::query_group(DefDatabaseStorage)]
 #[salsa::requires(AstDatabase)]
 pub trait DefDatabase: HirDebugDatabase + DefDatabase2 {
-    #[salsa::invoke(crate::traits::TraitData::trait_data_query)]
-    fn trait_data(&self, t: Trait) -> Arc<TraitData>;
-
-    #[salsa::invoke(crate::traits::TraitItemsIndex::trait_items_index)]
-    fn trait_items_index(&self, module: Module) -> crate::traits::TraitItemsIndex;
-
     #[salsa::invoke(crate::generics::generic_params_query)]
     fn generic_params(&self, def: GenericDef) -> Arc<GenericParams>;
 
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index da33c9591..7ac9a9041 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -33,7 +33,6 @@ pub mod source_binder;
 
 mod ids;
 mod adt;
-mod traits;
 mod type_alias;
 mod ty;
 mod impl_block;
diff --git a/crates/ra_hir/src/traits.rs b/crates/ra_hir/src/traits.rs
deleted file mode 100644
index 858972c6f..000000000
--- a/crates/ra_hir/src/traits.rs
+++ /dev/null
@@ -1,82 +0,0 @@
-//! HIR for trait definitions.
-
-use std::sync::Arc;
-
-use hir_expand::name::AsName;
-
-use ra_syntax::ast::{self, NameOwner};
-use rustc_hash::FxHashMap;
-
-use crate::{
-    db::{AstDatabase, DefDatabase},
-    ids::LocationCtx,
-    AssocItem, Const, Function, HasSource, Module, Name, Trait, TypeAlias,
-};
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct TraitData {
-    name: Option<Name>,
-    items: Vec<AssocItem>,
-    auto: bool,
-}
-
-impl TraitData {
-    pub(crate) fn trait_data_query(
-        db: &(impl DefDatabase + AstDatabase),
-        tr: Trait,
-    ) -> Arc<TraitData> {
-        let src = tr.source(db);
-        let name = src.value.name().map(|n| n.as_name());
-        let module = tr.module(db);
-        let ctx = LocationCtx::new(db, module.id, src.file_id);
-        let auto = src.value.is_auto();
-        let items = if let Some(item_list) = src.value.item_list() {
-            item_list
-                .impl_items()
-                .map(|item_node| match item_node {
-                    ast::ImplItem::FnDef(it) => Function { id: ctx.to_def(&it) }.into(),
-                    ast::ImplItem::ConstDef(it) => Const { id: ctx.to_def(&it) }.into(),
-                    ast::ImplItem::TypeAliasDef(it) => TypeAlias { id: ctx.to_def(&it) }.into(),
-                })
-                .collect()
-        } else {
-            Vec::new()
-        };
-        Arc::new(TraitData { name, items, auto })
-    }
-
-    pub(crate) fn name(&self) -> &Option<Name> {
-        &self.name
-    }
-
-    pub(crate) fn items(&self) -> &[AssocItem] {
-        &self.items
-    }
-
-    pub(crate) fn is_auto(&self) -> bool {
-        self.auto
-    }
-}
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct TraitItemsIndex {
-    traits_by_def: FxHashMap<AssocItem, Trait>,
-}
-
-impl TraitItemsIndex {
-    pub(crate) fn trait_items_index(db: &impl DefDatabase, module: Module) -> TraitItemsIndex {
-        let mut index = TraitItemsIndex { traits_by_def: FxHashMap::default() };
-        for decl in module.declarations(db) {
-            if let crate::ModuleDef::Trait(tr) = decl {
-                for item in tr.trait_data(db).items() {
-                    index.traits_by_def.insert(*item, tr);
-                }
-            }
-        }
-        index
-    }
-
-    pub(crate) fn get_parent_trait(&self, item: AssocItem) -> Option<Trait> {
-        self.traits_by_def.get(&item).cloned()
-    }
-}
diff --git a/crates/ra_hir/src/ty/method_resolution.rs b/crates/ra_hir/src/ty/method_resolution.rs
index d20aeaacf..f377fca48 100644
--- a/crates/ra_hir/src/ty/method_resolution.rs
+++ b/crates/ra_hir/src/ty/method_resolution.rs
@@ -232,8 +232,8 @@ fn iterate_trait_method_candidates<T>(
         // trait, but if we find out it doesn't, we'll skip the rest of the
         // iteration
         let mut known_implemented = false;
-        for &item in data.items() {
-            if !is_valid_candidate(db, name, mode, item) {
+        for &item in data.items.iter() {
+            if !is_valid_candidate(db, name, mode, item.into()) {
                 continue;
             }
             if !known_implemented {
@@ -243,7 +243,7 @@ fn iterate_trait_method_candidates<T>(
                 }
             }
             known_implemented = true;
-            if let Some(result) = callback(&ty.value, item) {
+            if let Some(result) = callback(&ty.value, item.into()) {
                 return Some(result);
             }
         }
diff --git a/crates/ra_hir_def/src/db.rs b/crates/ra_hir_def/src/db.rs
index 348aca07f..fb4402463 100644
--- a/crates/ra_hir_def/src/db.rs
+++ b/crates/ra_hir_def/src/db.rs
@@ -8,12 +8,13 @@ use ra_syntax::ast;
 use crate::{
     adt::{EnumData, StructData},
     body::{scope::ExprScopes, Body, BodySourceMap},
-    imp::ImplData,
+    impls::ImplData,
     nameres::{
         raw::{ImportSourceMap, RawItems},
         CrateDefMap,
     },
-    DefWithBodyId, EnumId, ImplId, ItemLoc, StructOrUnionId,
+    traits::{TraitData, TraitItemsIndex},
+    DefWithBodyId, EnumId, ImplId, ItemLoc, ModuleId, StructOrUnionId, TraitId,
 };
 
 #[salsa::query_group(InternDatabaseStorage)]
@@ -59,6 +60,12 @@ pub trait DefDatabase2: InternDatabase + AstDatabase {
     #[salsa::invoke(ImplData::impl_data_query)]
     fn impl_data(&self, e: ImplId) -> Arc<ImplData>;
 
+    #[salsa::invoke(TraitData::trait_data_query)]
+    fn trait_data(&self, e: TraitId) -> Arc<TraitData>;
+
+    #[salsa::invoke(TraitItemsIndex::trait_items_index)]
+    fn trait_items_index(&self, module: ModuleId) -> TraitItemsIndex;
+
     #[salsa::invoke(Body::body_with_source_map_query)]
     fn body_with_source_map(&self, def: DefWithBodyId) -> (Arc<Body>, Arc<BodySourceMap>);
 
diff --git a/crates/ra_hir_def/src/imp.rs b/crates/ra_hir_def/src/impls.rs
index 4323dfcb6..4323dfcb6 100644
--- a/crates/ra_hir_def/src/imp.rs
+++ b/crates/ra_hir_def/src/impls.rs
diff --git a/crates/ra_hir_def/src/lib.rs b/crates/ra_hir_def/src/lib.rs
index dffc82ff8..38c110570 100644
--- a/crates/ra_hir_def/src/lib.rs
+++ b/crates/ra_hir_def/src/lib.rs
@@ -13,11 +13,12 @@ pub mod path;
 pub mod type_ref;
 pub mod builtin_type;
 pub mod adt;
-pub mod imp;
+pub mod impls;
 pub mod diagnostics;
 pub mod expr;
 pub mod body;
 pub mod generics;
+pub mod traits;
 
 #[cfg(test)]
 mod test_db;
diff --git a/crates/ra_hir_def/src/nameres.rs b/crates/ra_hir_def/src/nameres.rs
index e5b073a0f..c01e020ef 100644
--- a/crates/ra_hir_def/src/nameres.rs
+++ b/crates/ra_hir_def/src/nameres.rs
@@ -165,6 +165,14 @@ impl ModuleScope {
         self.items.iter().chain(BUILTIN_SCOPE.iter())
     }
 
+    pub fn declarations(&self) -> impl Iterator<Item = ModuleDefId> + '_ {
+        self.entries()
+            .filter_map(|(_name, res)| if res.import.is_none() { Some(res.def) } else { None })
+            .flat_map(|per_ns| {
+                per_ns.take_types().into_iter().chain(per_ns.take_values().into_iter())
+            })
+    }
+
     /// Iterate over all module scoped macros
     pub fn macros<'a>(&'a self) -> impl Iterator<Item = (&'a Name, MacroDefId)> + 'a {
         self.items
diff --git a/crates/ra_hir_def/src/traits.rs b/crates/ra_hir_def/src/traits.rs
new file mode 100644
index 000000000..a8ba31594
--- /dev/null
+++ b/crates/ra_hir_def/src/traits.rs
@@ -0,0 +1,67 @@
+//! HIR for trait definitions.
+
+use std::sync::Arc;
+
+use hir_expand::name::{AsName, Name};
+
+use ra_syntax::ast::{self, NameOwner};
+use rustc_hash::FxHashMap;
+
+use crate::{
+    db::DefDatabase2, AssocItemId, AstItemDef, ConstId, FunctionId, LocationCtx, ModuleDefId,
+    ModuleId, TraitId, TypeAliasId,
+};
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct TraitData {
+    pub name: Option<Name>,
+    pub items: Vec<AssocItemId>,
+    pub auto: bool,
+}
+
+impl TraitData {
+    pub(crate) fn trait_data_query(db: &impl DefDatabase2, tr: TraitId) -> Arc<TraitData> {
+        let src = tr.source(db);
+        let name = src.value.name().map(|n| n.as_name());
+        let module = tr.module(db);
+        let ctx = LocationCtx::new(db, module, src.file_id);
+        let auto = src.value.is_auto();
+        let items = if let Some(item_list) = src.value.item_list() {
+            item_list
+                .impl_items()
+                .map(|item_node| match item_node {
+                    ast::ImplItem::FnDef(it) => FunctionId::from_ast(ctx, &it).into(),
+                    ast::ImplItem::ConstDef(it) => ConstId::from_ast(ctx, &it).into(),
+                    ast::ImplItem::TypeAliasDef(it) => TypeAliasId::from_ast(ctx, &it).into(),
+                })
+                .collect()
+        } else {
+            Vec::new()
+        };
+        Arc::new(TraitData { name, items, auto })
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct TraitItemsIndex {
+    traits_by_def: FxHashMap<AssocItemId, TraitId>,
+}
+
+impl TraitItemsIndex {
+    pub fn trait_items_index(db: &impl DefDatabase2, module: ModuleId) -> TraitItemsIndex {
+        let mut index = TraitItemsIndex { traits_by_def: FxHashMap::default() };
+        let crate_def_map = db.crate_def_map(module.krate);
+        for decl in crate_def_map[module.module_id].scope.declarations() {
+            if let ModuleDefId::TraitId(tr) = decl {
+                for item in db.trait_data(tr).items.iter() {
+                    index.traits_by_def.insert(*item, tr);
+                }
+            }
+        }
+        index
+    }
+
+    pub fn get_parent_trait(&self, item: AssocItemId) -> Option<TraitId> {
+        self.traits_by_def.get(&item).cloned()
+    }
+}