More decoupling

crates/ra_hir/src/code_model.rs

@@ -618,7 +618,7 @@ impl Function {
     }
 
     pub fn infer(self, db: &impl HirDatabase) -> Arc<InferenceResult> {
-        db.infer(self.into())
+        db.infer(self.id.into())
     }
 
     /// The containing impl block, if this is a method.
@@ -672,7 +672,7 @@ impl Const {
     }
 
     pub fn infer(self, db: &impl HirDatabase) -> Arc<InferenceResult> {
-        db.infer(self.into())
+        db.infer(self.id.into())
     }
 
     /// The containing impl block, if this is a type alias.
@@ -715,7 +715,7 @@ impl Static {
     }
 
     pub fn infer(self, db: &impl HirDatabase) -> Arc<InferenceResult> {
-        db.infer(self.into())
+        db.infer(self.id.into())
     }
 }
 
@@ -908,9 +908,9 @@ impl Local {
     }
 
     pub fn ty(self, db: &impl HirDatabase) -> Type {
-        let infer = db.infer(self.parent);
-        let ty = infer[self.pat_id].clone();
         let def = DefWithBodyId::from(self.parent);
+        let infer = db.infer(def);
+        let ty = infer[self.pat_id].clone();
         let resolver = def.resolver(db);
         let krate = def.module(db).krate;
         let environment = TraitEnvironment::lower(db, &resolver);

crates/ra_hir/src/db.rs

@@ -2,18 +2,15 @@
 
 use std::sync::Arc;
 
-use hir_def::{GenericDefId, ImplId, LocalStructFieldId, TraitId, VariantId};
+use hir_def::{DefWithBodyId, GenericDefId, ImplId, LocalStructFieldId, TraitId, VariantId};
 use ra_arena::map::ArenaMap;
 use ra_db::{salsa, CrateId};
 
-use crate::{
-    ty::{
-        method_resolution::CrateImplBlocks,
-        traits::{AssocTyValue, Impl},
-        CallableDef, FnSig, GenericPredicate, InferenceResult, Substs, Ty, TyDefId, TypeCtor,
-        ValueTyDefId,
-    },
-    DefWithBody,
+use crate::ty::{
+    method_resolution::CrateImplBlocks,
+    traits::{AssocTyValue, Impl},
+    CallableDef, FnSig, GenericPredicate, InferenceResult, Substs, Ty, TyDefId, TypeCtor,
+    ValueTyDefId,
 };
 
 pub use hir_def::db::{
@@ -32,7 +29,7 @@ pub use hir_expand::db::{
 #[salsa::requires(salsa::Database)]
 pub trait HirDatabase: DefDatabase {
     #[salsa::invoke(crate::ty::infer_query)]
-    fn infer(&self, def: DefWithBody) -> Arc<InferenceResult>;
+    fn infer(&self, def: DefWithBodyId) -> Arc<InferenceResult>;
 
     #[salsa::invoke(crate::ty::ty_query)]
     fn ty(&self, def: TyDefId) -> Ty;

crates/ra_hir/src/source_binder.rs

@@ -168,7 +168,7 @@ impl SourceAnalyzer {
                 resolver,
                 body_owner: Some(def),
                 body_source_map: Some(source_map),
-                infer: Some(db.infer(def)),
+                infer: Some(db.infer(def.into())),
                 scopes: Some(scopes),
                 file_id: node.file_id,
             }
@@ -297,13 +297,13 @@ impl SourceAnalyzer {
         if let Some(path_expr) = path.syntax().parent().and_then(ast::PathExpr::cast) {
             let expr_id = self.expr_id(&path_expr.into())?;
             if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_expr(expr_id) {
-                return Some(PathResolution::AssocItem(assoc));
+                return Some(PathResolution::AssocItem(assoc.into()));
             }
         }
         if let Some(path_pat) = path.syntax().parent().and_then(ast::PathPat::cast) {
             let pat_id = self.pat_id(&path_pat.into())?;
             if let Some(assoc) = self.infer.as_ref()?.assoc_resolutions_for_pat(pat_id) {
-                return Some(PathResolution::AssocItem(assoc));
+                return Some(PathResolution::AssocItem(assoc.into()));
             }
         }
         // This must be a normal source file rather than macro file.

crates/ra_hir/src/ty/infer.rs

@@ -41,10 +41,7 @@ use super::{
     ApplicationTy, InEnvironment, ProjectionTy, Substs, TraitEnvironment, TraitRef, Ty, TypeCtor,
     TypeWalk, Uncertain,
 };
-use crate::{
-    db::HirDatabase, ty::infer::diagnostics::InferenceDiagnostic, AssocItem, DefWithBody,
-    VariantDef,
-};
+use crate::{db::HirDatabase, ty::infer::diagnostics::InferenceDiagnostic, VariantDef};
 
 macro_rules! ty_app {
     ($ctor:pat, $param:pat) => {
@@ -62,15 +59,15 @@ mod pat;
 mod coerce;
 
 /// The entry point of type inference.
-pub fn infer_query(db: &impl HirDatabase, def: DefWithBody) -> Arc<InferenceResult> {
+pub fn infer_query(db: &impl HirDatabase, def: DefWithBodyId) -> Arc<InferenceResult> {
     let _p = profile("infer_query");
-    let resolver = DefWithBodyId::from(def).resolver(db);
+    let resolver = def.resolver(db);
     let mut ctx = InferenceContext::new(db, def, resolver);
 
-    match &def {
-        DefWithBody::Const(c) => ctx.collect_const(&db.const_data(c.id)),
-        DefWithBody::Function(f) => ctx.collect_fn(&db.function_data(f.id)),
-        DefWithBody::Static(s) => ctx.collect_const(&db.static_data(s.id)),
+    match def {
+        DefWithBodyId::ConstId(c) => ctx.collect_const(&db.const_data(c)),
+        DefWithBodyId::FunctionId(f) => ctx.collect_fn(&db.function_data(f)),
+        DefWithBodyId::StaticId(s) => ctx.collect_const(&db.static_data(s)),
     }
 
     ctx.infer_body();
@@ -129,7 +126,7 @@ pub struct InferenceResult {
     /// For each struct literal, records the variant it resolves to.
     variant_resolutions: FxHashMap<ExprOrPatId, VariantDef>,
     /// For each associated item record what it resolves to
-    assoc_resolutions: FxHashMap<ExprOrPatId, AssocItem>,
+    assoc_resolutions: FxHashMap<ExprOrPatId, AssocItemId>,
     diagnostics: Vec<InferenceDiagnostic>,
     pub(super) type_of_expr: ArenaMap<ExprId, Ty>,
     pub(super) type_of_pat: ArenaMap<PatId, Ty>,
@@ -152,10 +149,10 @@ impl InferenceResult {
     pub fn variant_resolution_for_pat(&self, id: PatId) -> Option<VariantDef> {
         self.variant_resolutions.get(&id.into()).copied()
     }
-    pub fn assoc_resolutions_for_expr(&self, id: ExprId) -> Option<AssocItem> {
+    pub fn assoc_resolutions_for_expr(&self, id: ExprId) -> Option<AssocItemId> {
         self.assoc_resolutions.get(&id.into()).copied()
     }
-    pub fn assoc_resolutions_for_pat(&self, id: PatId) -> Option<AssocItem> {
+    pub fn assoc_resolutions_for_pat(&self, id: PatId) -> Option<AssocItemId> {
         self.assoc_resolutions.get(&id.into()).copied()
     }
     pub fn type_mismatch_for_expr(&self, expr: ExprId) -> Option<&TypeMismatch> {
@@ -191,7 +188,7 @@ impl Index<PatId> for InferenceResult {
 #[derive(Clone, Debug)]
 struct InferenceContext<'a, D: HirDatabase> {
     db: &'a D,
-    owner: DefWithBody,
+    owner: DefWithBodyId,
     body: Arc<Body>,
     resolver: Resolver,
     var_unification_table: InPlaceUnificationTable<TypeVarId>,
@@ -209,7 +206,7 @@ struct InferenceContext<'a, D: HirDatabase> {
 }
 
 impl<'a, D: HirDatabase> InferenceContext<'a, D> {
-    fn new(db: &'a D, owner: DefWithBody, resolver: Resolver) -> Self {
+    fn new(db: &'a D, owner: DefWithBodyId, resolver: Resolver) -> Self {
         InferenceContext {
             result: InferenceResult::default(),
             var_unification_table: InPlaceUnificationTable::new(),