internal: Some cleanup and perf

crates/base-db/src/input.rs

@@ -285,9 +285,9 @@ pub struct CrateData {
     /// For purposes of analysis, crates are anonymous (only names in
     /// `Dependency` matters), this name should only be used for UI.
     pub display_name: Option<CrateDisplayName>,
-    pub cfg_options: CfgOptions,
+    pub cfg_options: Arc<CfgOptions>,
     /// The cfg options that could be used by the crate
-    pub potential_cfg_options: Option<CfgOptions>,
+    pub potential_cfg_options: Option<Arc<CfgOptions>>,
     pub env: Env,
     pub dependencies: Vec<Dependency>,
     pub origin: CrateOrigin,
@@ -328,8 +328,8 @@ impl CrateGraph {
         edition: Edition,
         display_name: Option<CrateDisplayName>,
         version: Option<String>,
-        cfg_options: CfgOptions,
-        potential_cfg_options: Option<CfgOptions>,
+        cfg_options: Arc<CfgOptions>,
+        potential_cfg_options: Option<Arc<CfgOptions>>,
         env: Env,
         is_proc_macro: bool,
         origin: CrateOrigin,

crates/hir-def/src/data.rs

@@ -737,7 +737,7 @@ impl<'a> AssocItemCollector<'a> {
                     &AstIdWithPath::new(file_id, ast_id, Clone::clone(path)),
                     ctxt,
                     expand_to,
-                    self.expander.module.krate(),
+                    self.expander.krate(),
                     resolver,
                 ) {
                     Ok(Some(call_id)) => {

crates/hir-def/src/data/adt.rs

@@ -191,8 +191,6 @@ impl StructData {
         let krate = loc.container.krate;
         let item_tree = loc.id.item_tree(db);
         let repr = repr_from_value(db, krate, &item_tree, ModItem::from(loc.id.value).into());
-        let cfg_options = db.crate_graph()[krate].cfg_options.clone();
-
         let attrs = item_tree.attrs(db, krate, ModItem::from(loc.id.value).into());
 
         let mut flags = StructFlags::NO_FLAGS;
@@ -219,7 +217,7 @@ impl StructData {
             loc.id.file_id(),
             loc.container.local_id,
             &item_tree,
-            &cfg_options,
+            &db.crate_graph()[krate].cfg_options,
             &strukt.fields,
             None,
         );
@@ -248,8 +246,6 @@ impl StructData {
         let krate = loc.container.krate;
         let item_tree = loc.id.item_tree(db);
         let repr = repr_from_value(db, krate, &item_tree, ModItem::from(loc.id.value).into());
-        let cfg_options = db.crate_graph()[krate].cfg_options.clone();
-
         let attrs = item_tree.attrs(db, krate, ModItem::from(loc.id.value).into());
         let mut flags = StructFlags::NO_FLAGS;
         if attrs.by_key("rustc_has_incoherent_inherent_impls").exists() {
@@ -266,7 +262,7 @@ impl StructData {
             loc.id.file_id(),
             loc.container.local_id,
             &item_tree,
-            &cfg_options,
+            &db.crate_graph()[krate].cfg_options,
             &union.fields,
             None,
         );
@@ -338,7 +334,6 @@ impl EnumVariantData {
         let container = loc.parent.lookup(db).container;
         let krate = container.krate;
         let item_tree = loc.id.item_tree(db);
-        let cfg_options = db.crate_graph()[krate].cfg_options.clone();
         let variant = &item_tree[loc.id.value];
 
         let (var_data, diagnostics) = lower_fields(
@@ -347,7 +342,7 @@ impl EnumVariantData {
             loc.id.file_id(),
             container.local_id,
             &item_tree,
-            &cfg_options,
+            &db.crate_graph()[krate].cfg_options,
             &variant.fields,
             Some(item_tree[loc.parent.lookup(db).id.value].visibility),
         );

crates/hir-def/src/expander.rs

@@ -11,6 +11,7 @@ use hir_expand::{
 };
 use limit::Limit;
 use syntax::{ast, Parse};
+use triomphe::Arc;
 
 use crate::{
     attr::Attrs, db::DefDatabase, lower::LowerCtx, path::Path, AsMacroCall, MacroId, ModuleId,
@@ -19,9 +20,8 @@ use crate::{
 
 #[derive(Debug)]
 pub struct Expander {
-    cfg_options: CfgOptions,
+    cfg_options: Arc<CfgOptions>,
     span_map: OnceCell<SpanMap>,
-    krate: CrateId,
     current_file_id: HirFileId,
     pub(crate) module: ModuleId,
     /// `recursion_depth == usize::MAX` indicates that the recursion limit has been reached.
@@ -45,10 +45,13 @@ impl Expander {
             recursion_limit,
             cfg_options: db.crate_graph()[module.krate].cfg_options.clone(),
             span_map: OnceCell::new(),
-            krate: module.krate,
         }
     }
 
+    pub fn krate(&self) -> CrateId {
+        self.module.krate
+    }
+
     pub fn enter_expand<T: ast::AstNode>(
         &mut self,
         db: &dyn DefDatabase,
@@ -112,7 +115,7 @@ impl Expander {
     pub(crate) fn parse_attrs(&self, db: &dyn DefDatabase, owner: &dyn ast::HasAttrs) -> Attrs {
         Attrs::filter(
             db,
-            self.krate,
+            self.krate(),
             RawAttrs::new(
                 db.upcast(),
                 owner,

crates/hir-def/src/generics.rs

@@ -3,13 +3,15 @@
 //! generic parameters. See also the `Generics` type and the `generics_of` query
 //! in rustc.
 
+use std::ops;
+
 use either::Either;
 use hir_expand::{
     name::{AsName, Name},
     ExpandResult,
 };
 use intern::Interned;
-use la_arena::{Arena, Idx};
+use la_arena::Arena;
 use once_cell::unsync::Lazy;
 use stdx::impl_from;
 use syntax::ast::{self, HasGenericParams, HasName, HasTypeBounds};
@@ -23,7 +25,7 @@ use crate::{
     nameres::{DefMap, MacroSubNs},
     type_ref::{ConstRef, LifetimeRef, TypeBound, TypeRef},
     AdtId, ConstParamId, GenericDefId, HasModule, ItemTreeLoc, LifetimeParamId,
-    LocalTypeOrConstParamId, Lookup, TypeOrConstParamId, TypeParamId,
+    LocalLifetimeParamId, LocalTypeOrConstParamId, Lookup, TypeOrConstParamId, TypeParamId,
 };
 
 /// Data about a generic type parameter (to a function, struct, impl, ...).
@@ -158,6 +160,20 @@ pub struct GenericParams {
     pub where_predicates: Box<[WherePredicate]>,
 }
 
+impl ops::Index<LocalTypeOrConstParamId> for GenericParams {
+    type Output = TypeOrConstParamData;
+    fn index(&self, index: LocalTypeOrConstParamId) -> &TypeOrConstParamData {
+        &self.type_or_consts[index]
+    }
+}
+
+impl ops::Index<LocalLifetimeParamId> for GenericParams {
+    type Output = LifetimeParamData;
+    fn index(&self, index: LocalLifetimeParamId) -> &LifetimeParamData {
+        &self.lifetimes[index]
+    }
+}
+
 /// A single predicate from a where clause, i.e. `where Type: Trait`. Combined
 /// where clauses like `where T: Foo + Bar` are turned into multiple of these.
 /// It might still result in multiple actual predicates though, because of
@@ -199,7 +215,7 @@ impl GenericParamsCollector {
         lower_ctx: &LowerCtx<'_>,
         node: &dyn HasGenericParams,
         add_param_attrs: impl FnMut(
-            Either<Idx<TypeOrConstParamData>, Idx<LifetimeParamData>>,
+            Either<LocalTypeOrConstParamId, LocalLifetimeParamId>,
             ast::GenericParam,
         ),
     ) {
@@ -227,7 +243,7 @@ impl GenericParamsCollector {
         lower_ctx: &LowerCtx<'_>,
         params: ast::GenericParamList,
         mut add_param_attrs: impl FnMut(
-            Either<Idx<TypeOrConstParamData>, Idx<LifetimeParamData>>,
+            Either<LocalTypeOrConstParamId, LocalLifetimeParamId>,
             ast::GenericParam,
         ),
     ) {
@@ -416,16 +432,16 @@ impl GenericParams {
     }
 
     /// Iterator of type_or_consts field
-    pub fn iter(
+    pub fn iter_type_or_consts(
         &self,
-    ) -> impl DoubleEndedIterator<Item = (Idx<TypeOrConstParamData>, &TypeOrConstParamData)> {
+    ) -> impl DoubleEndedIterator<Item = (LocalTypeOrConstParamId, &TypeOrConstParamData)> {
         self.type_or_consts.iter()
     }
 
     /// Iterator of lifetimes field
     pub fn iter_lt(
         &self,
-    ) -> impl DoubleEndedIterator<Item = (Idx<LifetimeParamData>, &LifetimeParamData)> {
+    ) -> impl DoubleEndedIterator<Item = (LocalLifetimeParamId, &LifetimeParamData)> {
         self.lifetimes.iter()
     }
 

crates/hir-ty/src/consteval.rs

@@ -77,30 +77,32 @@ pub(crate) fn path_to_const(
     resolver: &Resolver,
     path: &Path,
     mode: ParamLoweringMode,
-    args_lazy: impl FnOnce() -> Generics,
+    args: impl FnOnce() -> Option<Generics>,
     debruijn: DebruijnIndex,
     expected_ty: Ty,
 ) -> Option<Const> {
     match resolver.resolve_path_in_value_ns_fully(db.upcast(), path) {
         Some(ValueNs::GenericParam(p)) => {
             let ty = db.const_param_ty(p);
-            let args = args_lazy();
             let value = match mode {
                 ParamLoweringMode::Placeholder => {
                     ConstValue::Placeholder(to_placeholder_idx(db, p.into()))
                 }
-                ParamLoweringMode::Variable => match args.param_idx(p.into()) {
-                    Some(it) => ConstValue::BoundVar(BoundVar::new(debruijn, it)),
-                    None => {
-                        never!(
-                            "Generic list doesn't contain this param: {:?}, {:?}, {:?}",
-                            args,
-                            path,
-                            p
-                        );
-                        return None;
+                ParamLoweringMode::Variable => {
+                    let args = args();
+                    match args.as_ref().and_then(|args| args.type_or_const_param_idx(p.into())) {
+                        Some(it) => ConstValue::BoundVar(BoundVar::new(debruijn, it)),
+                        None => {
+                            never!(
+                                "Generic list doesn't contain this param: {:?}, {:?}, {:?}",
+                                args,
+                                path,
+                                p
+                            );
+                            return None;
+                        }
                     }
-                },
+                }
             };
             Some(ConstData { ty, value }.intern(Interner))
         }
@@ -285,7 +287,6 @@ pub(crate) fn eval_to_const(
     expr: ExprId,
     mode: ParamLoweringMode,
     ctx: &mut InferenceContext<'_>,
-    args: impl FnOnce() -> Generics,
     debruijn: DebruijnIndex,
 ) -> Const {
     let db = ctx.db;
@@ -304,7 +305,9 @@ pub(crate) fn eval_to_const(
     }
     if let Expr::Path(p) = &ctx.body.exprs[expr] {
         let resolver = &ctx.resolver;
-        if let Some(c) = path_to_const(db, resolver, p, mode, args, debruijn, infer[expr].clone()) {
+        if let Some(c) =
+            path_to_const(db, resolver, p, mode, || ctx.generics(), debruijn, infer[expr].clone())
+        {
             return c;
         }
     }

crates/hir-ty/src/display.rs

@@ -453,7 +453,7 @@ impl HirDisplay for Const {
             ConstValue::Placeholder(idx) => {
                 let id = from_placeholder_idx(f.db, *idx);
                 let generics = generics(f.db.upcast(), id.parent);
-                let param_data = &generics.params.type_or_consts[id.local_id];
+                let param_data = &generics.params[id.local_id];
                 write!(f, "{}", param_data.name().unwrap().display(f.db.upcast()))?;
                 Ok(())
             }
@@ -1176,7 +1176,7 @@ impl HirDisplay for Ty {
             TyKind::Placeholder(idx) => {
                 let id = from_placeholder_idx(db, *idx);
                 let generics = generics(db.upcast(), id.parent);
-                let param_data = &generics.params.type_or_consts[id.local_id];
+                let param_data = &generics.params[id.local_id];
                 match param_data {
                     TypeOrConstParamData::TypeParamData(p) => match p.provenance {
                         TypeParamProvenance::TypeParamList | TypeParamProvenance::TraitSelf => {
@@ -1724,7 +1724,7 @@ impl HirDisplay for LifetimeData {
             LifetimeData::Placeholder(idx) => {
                 let id = lt_from_placeholder_idx(f.db, *idx);
                 let generics = generics(f.db.upcast(), id.parent);
-                let param_data = &generics.params.lifetimes[id.local_id];
+                let param_data = &generics.params[id.local_id];
                 write!(f, "{}", param_data.name.display(f.db.upcast()))?;
                 Ok(())
             }

crates/hir-ty/src/infer.rs

@@ -60,7 +60,7 @@ use crate::{
     lower::ImplTraitLoweringMode,
     to_assoc_type_id,
     traits::FnTrait,
-    utils::{InTypeConstIdMetadata, UnevaluatedConstEvaluatorFolder},
+    utils::{Generics, InTypeConstIdMetadata, UnevaluatedConstEvaluatorFolder},
     AliasEq, AliasTy, Binders, ClosureId, Const, DomainGoal, GenericArg, Goal, ImplTraitId,
     ImplTraitIdx, InEnvironment, Interner, Lifetime, OpaqueTyId, ProjectionTy, Substitution,
     TraitEnvironment, Ty, TyBuilder, TyExt,
@@ -630,6 +630,10 @@ impl<'a> InferenceContext<'a> {
         }
     }
 
+    pub(crate) fn generics(&self) -> Option<Generics> {
+        Some(crate::utils::generics(self.db.upcast(), self.resolver.generic_def()?))
+    }
+
     // FIXME: This function should be private in module. It is currently only used in the consteval, since we need
     // `InferenceResult` in the middle of inference. See the fixme comment in `consteval::eval_to_const`. If you
     // used this function for another workaround, mention it here. If you really need this function and believe that

crates/hir-ty/src/infer/cast.rs

@@ -19,10 +19,6 @@ impl CastCheck {
         let expr_ty = table.resolve_ty_shallow(&self.expr_ty);
         let cast_ty = table.resolve_ty_shallow(&self.cast_ty);
 
-        if expr_ty.contains_unknown() || cast_ty.contains_unknown() {
-            return;
-        }
-
         if table.coerce(&expr_ty, &cast_ty).is_ok() {
             return;
         }

crates/hir-ty/src/infer/closure.rs

@@ -26,7 +26,7 @@ use crate::{
     mir::{BorrowKind, MirSpan, MutBorrowKind, ProjectionElem},
     to_chalk_trait_id,
     traits::FnTrait,
-    utils::{self, elaborate_clause_supertraits, generics, Generics},
+    utils::{self, elaborate_clause_supertraits, Generics},
     Adjust, Adjustment, AliasEq, AliasTy, Binders, BindingMode, ChalkTraitId, ClosureId, DynTy,
     DynTyExt, FnAbi, FnPointer, FnSig, Interner, OpaqueTy, ProjectionTyExt, Substitution, Ty,
     TyExt, WhereClause,
@@ -331,14 +331,10 @@ impl CapturedItemWithoutTy {
             place: self.place,
             kind: self.kind,
             span: self.span,
-            ty: replace_placeholder_with_binder(ctx.db, ctx.owner, ty),
+            ty: replace_placeholder_with_binder(ctx, ty),
         };
 
-        fn replace_placeholder_with_binder(
-            db: &dyn HirDatabase,
-            owner: DefWithBodyId,
-            ty: Ty,
-        ) -> Binders<Ty> {
+        fn replace_placeholder_with_binder(ctx: &mut InferenceContext<'_>, ty: Ty) -> Binders<Ty> {
             struct Filler<'a> {
                 db: &'a dyn HirDatabase,
                 generics: Generics,
@@ -361,7 +357,7 @@ impl CapturedItemWithoutTy {
                     outer_binder: DebruijnIndex,
                 ) -> Result<chalk_ir::Const<Interner>, Self::Error> {
                     let x = from_placeholder_idx(self.db, idx);
-                    let Some(idx) = self.generics.param_idx(x) else {
+                    let Some(idx) = self.generics.type_or_const_param_idx(x) else {
                         return Err(());
                     };
                     Ok(BoundVar::new(outer_binder, idx).to_const(Interner, ty))
@@ -373,18 +369,18 @@ impl CapturedItemWithoutTy {
                     outer_binder: DebruijnIndex,
                 ) -> std::result::Result<Ty, Self::Error> {
                     let x = from_placeholder_idx(self.db, idx);
-                    let Some(idx) = self.generics.param_idx(x) else {
+                    let Some(idx) = self.generics.type_or_const_param_idx(x) else {
                         return Err(());
                     };
                     Ok(BoundVar::new(outer_binder, idx).to_ty(Interner))
                 }
             }
-            let Some(generic_def) = owner.as_generic_def_id() else {
+            let Some(generics) = ctx.generics() else {
                 return Binders::empty(Interner, ty);
             };
-            let filler = &mut Filler { db, generics: generics(db.upcast(), generic_def) };
+            let filler = &mut Filler { db: ctx.db, generics };
             let result = ty.clone().try_fold_with(filler, DebruijnIndex::INNERMOST).unwrap_or(ty);
-            make_binders(db, &filler.generics, result)
+            make_binders(ctx.db, &filler.generics, result)
         }
     }
 }