4 files changed, 52 insertions, 66 deletions

diff --git a/crates/hir/src/attrs.rs b/crates/hir/src/attrs.rs
index 953960e14..36027d183 100644
--- a/crates/hir/src/attrs.rs
+++ b/crates/hir/src/attrs.rs
@@ -4,60 +4,63 @@ use hir_def::{
     db::DefDatabase,
     docs::Documentation,
     resolver::{HasResolver, Resolver},
-    AdtId, FunctionId, GenericDefId, ModuleId, StaticId, TraitId, VariantId,
+    AdtId, AttrDefId, FunctionId, GenericDefId, ModuleId, StaticId, TraitId, VariantId,
 };
 use hir_ty::db::HirDatabase;
-use stdx::impl_from;
 
 use crate::{
     doc_links::Resolvable, Adt, Const, Enum, EnumVariant, Field, Function, GenericDef, ImplDef,
     Local, MacroDef, Module, ModuleDef, Static, Struct, Trait, TypeAlias, TypeParam, Union,
 };
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum AttrDef {
-    Module(Module),
-    Field(Field),
-    Adt(Adt),
-    Function(Function),
-    EnumVariant(EnumVariant),
-    Static(Static),
-    Const(Const),
-    Trait(Trait),
-    TypeAlias(TypeAlias),
-    MacroDef(MacroDef),
-}
-
-impl_from!(
-    Module,
-    Field,
-    Adt(Struct, Enum, Union),
-    EnumVariant,
-    Static,
-    Const,
-    Function,
-    Trait,
-    TypeAlias,
-    MacroDef
-    for AttrDef
-);
-
 pub trait HasAttrs {
     fn attrs(self, db: &dyn HirDatabase) -> Attrs;
     fn docs(self, db: &dyn HirDatabase) -> Option<Documentation>;
 }
 
-impl<T: Into<AttrDef>> HasAttrs for T {
-    fn attrs(self, db: &dyn HirDatabase) -> Attrs {
-        let def: AttrDef = self.into();
-        db.attrs(def.into())
-    }
-    fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
-        let def: AttrDef = self.into();
-        db.documentation(def.into())
-    }
+macro_rules! impl_has_attrs {
+    ($(($def:ident, $def_id:ident),)*) => {$(
+        impl HasAttrs for $def {
+            fn attrs(self, db: &dyn HirDatabase) -> Attrs {
+                let def = AttrDefId::$def_id(self.into());
+                db.attrs(def)
+            }
+            fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
+                let def = AttrDefId::$def_id(self.into());
+                db.documentation(def)
+            }
+        }
+    )*};
+}
+
+impl_has_attrs![
+    (Field, FieldId),
+    (EnumVariant, EnumVariantId),
+    (Static, StaticId),
+    (Const, ConstId),
+    (Trait, TraitId),
+    (TypeAlias, TypeAliasId),
+    (MacroDef, MacroDefId),
+    (Function, FunctionId),
+    (Adt, AdtId),
+    (Module, ModuleId),
+];
+
+macro_rules! impl_has_attrs_adt {
+    ($($adt:ident),*) => {$(
+        impl HasAttrs for $adt {
+            fn attrs(self, db: &dyn HirDatabase) -> Attrs {
+                Adt::$adt(self).attrs(db)
+            }
+            fn docs(self, db: &dyn HirDatabase) -> Option<Documentation> {
+                Adt::$adt(self).docs(db)
+            }
+        }
+    )*};
 }
 
+impl_has_attrs_adt![Struct, Union, Enum];
+
 impl Resolvable for ModuleDef {
     fn resolver<D: DefDatabase + HirDatabase>(&self, db: &D) -> Option<Resolver> {
         Some(match self {
diff --git a/crates/hir/src/code_model.rs b/crates/hir/src/code_model.rs
index 59d8b3073..c2ee20dbb 100644
--- a/crates/hir/src/code_model.rs
+++ b/crates/hir/src/code_model.rs
@@ -17,9 +17,9 @@ use hir_def::{
     resolver::{HasResolver, Resolver},
     src::HasSource as _,
     type_ref::{Mutability, TypeRef},
-    AdtId, AssocContainerId, ConstId, DefWithBodyId, EnumId, FunctionId, GenericDefId, HasModule,
-    ImplId, LocalEnumVariantId, LocalFieldId, LocalModuleId, Lookup, ModuleId, StaticId, StructId,
-    TraitId, TypeAliasId, TypeParamId, UnionId,
+    AdtId, AssocContainerId, AttrDefId, ConstId, DefWithBodyId, EnumId, FunctionId, GenericDefId,
+    HasModule, ImplId, LocalEnumVariantId, LocalFieldId, LocalModuleId, Lookup, ModuleId, StaticId,
+    StructId, TraitId, TypeAliasId, TypeParamId, UnionId,
 };
 use hir_expand::{
     diagnostics::DiagnosticSink,
@@ -43,7 +43,7 @@ use tt::{Ident, Leaf, Literal, TokenTree};
 use crate::{
     db::{DefDatabase, HirDatabase},
     has_source::HasSource,
-    AttrDef, HirDisplay, InFile, Name,
+    HirDisplay, InFile, Name,
 };
 
 /// hir::Crate describes a single crate. It's the main interface with which
@@ -126,7 +126,7 @@ impl Crate {
     /// Try to get the root URL of the documentation of a crate.
     pub fn get_html_root_url(self: &Crate, db: &dyn HirDatabase) -> Option<String> {
         // Look for #![doc(html_root_url = "...")]
-        let attrs = db.attrs(AttrDef::from(self.root_module(db)).into());
+        let attrs = db.attrs(AttrDefId::ModuleId(self.root_module(db).into()));
         let doc_attr_q = attrs.by_key("doc");
 
         if !doc_attr_q.exists() {
diff --git a/crates/hir/src/from_id.rs b/crates/hir/src/from_id.rs
index a53ac1e08..033f53ac2 100644
--- a/crates/hir/src/from_id.rs
+++ b/crates/hir/src/from_id.rs
@@ -4,13 +4,13 @@
 //! are splitting the hir.
 
 use hir_def::{
-    expr::PatId, AdtId, AssocItemId, AttrDefId, DefWithBodyId, EnumVariantId, FieldId,
-    GenericDefId, ModuleDefId, VariantId,
+    expr::PatId, AdtId, AssocItemId, DefWithBodyId, EnumVariantId, FieldId, GenericDefId,
+    ModuleDefId, VariantId,
 };
 
 use crate::{
-    code_model::ItemInNs, Adt, AssocItem, AttrDef, DefWithBody, EnumVariant, Field, GenericDef,
-    Local, MacroDef, ModuleDef, VariantDef,
+    code_model::ItemInNs, Adt, AssocItem, DefWithBody, EnumVariant, Field, GenericDef, Local,
+    MacroDef, ModuleDef, VariantDef,
 };
 
 macro_rules! from_id {
@@ -196,23 +196,6 @@ impl From<FieldId> for Field {
     }
 }
 
-impl From<AttrDef> for AttrDefId {
-    fn from(def: AttrDef) -> Self {
-        match def {
-            AttrDef::Module(it) => AttrDefId::ModuleId(it.id),
-            AttrDef::Field(it) => AttrDefId::FieldId(it.into()),
-            AttrDef::Adt(it) => AttrDefId::AdtId(it.into()),
-            AttrDef::Function(it) => AttrDefId::FunctionId(it.id),
-            AttrDef::EnumVariant(it) => AttrDefId::EnumVariantId(it.into()),
-            AttrDef::Static(it) => AttrDefId::StaticId(it.id),
-            AttrDef::Const(it) => AttrDefId::ConstId(it.id),
-            AttrDef::Trait(it) => AttrDefId::TraitId(it.id),
-            AttrDef::TypeAlias(it) => AttrDefId::TypeAliasId(it.id),
-            AttrDef::MacroDef(it) => AttrDefId::MacroDefId(it.id),
-        }
-    }
-}
-
 impl From<AssocItem> for GenericDefId {
     fn from(item: AssocItem) -> Self {
         match item {
diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index d1c198bff..03915ea1b 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -32,7 +32,7 @@ mod attrs;
 mod has_source;
 
 pub use crate::{
-    attrs::{AttrDef, HasAttrs},
+    attrs::HasAttrs,
     code_model::{
         Access, Adt, AsAssocItem, AssocItem, AssocItemContainer, Callable, CallableKind, Const,
         Crate, CrateDependency, DefWithBody, Enum, EnumVariant, Field, FieldSource, Function,