Auto merge of rust-lang#17487 - Veykril:ty-perf-stuff, r=Veykril

internal: Some more small memory optimizations

Not a big impact on metrics, though there are some more savings in queries mainly used by the IDE layer from this

src/tools/rust-analyzer/Cargo.lock

@@ -1046,6 +1046,7 @@ checksum = "75761162ae2b0e580d7e7c390558127e5f01b4194debd6221fd8c207fc80e3f5"
 name = "mbe"
 version = "0.0.0"
 dependencies = [
+ "arrayvec",
  "cov-mark",
  "parser",
  "rustc-hash",

src/tools/rust-analyzer/crates/hir-def/src/data.rs

@@ -323,7 +323,7 @@ impl TraitAliasData {
 pub struct ImplData {
     pub target_trait: Option<Interned<TraitRef>>,
     pub self_ty: Interned<TypeRef>,
-    pub items: Vec<AssocItemId>,
+    pub items: Box<[AssocItemId]>,
     pub is_negative: bool,
     pub is_unsafe: bool,
     // box it as the vec is usually empty anyways

src/tools/rust-analyzer/crates/hir-def/src/db.rs

@@ -80,9 +80,11 @@ pub trait InternDatabase: SourceDatabase {
 
 #[salsa::query_group(DefDatabaseStorage)]
 pub trait DefDatabase: InternDatabase + ExpandDatabase + Upcast<dyn ExpandDatabase> {
+    /// Whether to expand procedural macros during name resolution.
     #[salsa::input]
     fn expand_proc_attr_macros(&self) -> bool;
 
+    /// Computes an [`ItemTree`] for the given file or macro expansion.
     #[salsa::invoke(ItemTree::file_item_tree_query)]
     fn file_item_tree(&self, file_id: HirFileId) -> Arc<ItemTree>;
 
@@ -96,6 +98,7 @@ pub trait DefDatabase: InternDatabase + ExpandDatabase + Upcast<dyn ExpandDataba
     #[salsa::invoke(DefMap::block_def_map_query)]
     fn block_def_map(&self, block: BlockId) -> Arc<DefMap>;
 
+    /// Turns a MacroId into a MacroDefId, describing the macro's definition post name resolution.
     fn macro_def(&self, m: MacroId) -> MacroDefId;
 
     // region:data
@@ -190,6 +193,7 @@ pub trait DefDatabase: InternDatabase + ExpandDatabase + Upcast<dyn ExpandDataba
     #[salsa::invoke(Attrs::fields_attrs_query)]
     fn fields_attrs(&self, def: VariantId) -> Arc<ArenaMap<LocalFieldId, Attrs>>;
 
+    // should this really be a query?
     #[salsa::invoke(crate::attr::fields_attrs_source_map)]
     fn fields_attrs_source_map(
         &self,

src/tools/rust-analyzer/crates/hir-def/src/generics.rs

@@ -582,13 +582,11 @@ impl GenericParams {
             GenericDefId::TraitAliasId(id) => id_to_generics(db, id, enabled_params),
             GenericDefId::TypeAliasId(id) => id_to_generics(db, id, enabled_params),
             GenericDefId::ImplId(id) => id_to_generics(db, id, enabled_params),
-            GenericDefId::EnumVariantId(_) | GenericDefId::ConstId(_) => {
-                Interned::new(GenericParams {
-                    type_or_consts: Default::default(),
-                    lifetimes: Default::default(),
-                    where_predicates: Default::default(),
-                })
-            }
+            GenericDefId::ConstId(_) => Interned::new(GenericParams {
+                type_or_consts: Default::default(),
+                lifetimes: Default::default(),
+                where_predicates: Default::default(),
+            }),
         }
     }
 

src/tools/rust-analyzer/crates/hir-def/src/item_tree.rs

@@ -48,6 +48,7 @@ use either::Either;
 use hir_expand::{attrs::RawAttrs, name::Name, ExpandTo, HirFileId, InFile};
 use intern::Interned;
 use la_arena::{Arena, Idx, IdxRange, RawIdx};
+use once_cell::sync::OnceCell;
 use rustc_hash::FxHashMap;
 use smallvec::SmallVec;
 use span::{AstIdNode, FileAstId, SyntaxContextId};
@@ -100,6 +101,7 @@ pub struct ItemTree {
 impl ItemTree {
     pub(crate) fn file_item_tree_query(db: &dyn DefDatabase, file_id: HirFileId) -> Arc<ItemTree> {
         let _p = tracing::info_span!("file_item_tree_query", ?file_id).entered();
+        static EMPTY: OnceCell<Arc<ItemTree>> = OnceCell::new();
 
         let syntax = db.parse_or_expand(file_id);
 
@@ -131,18 +133,47 @@ impl ItemTree {
         if let Some(attrs) = top_attrs {
             item_tree.attrs.insert(AttrOwner::TopLevel, attrs);
         }
-        item_tree.shrink_to_fit();
-        Arc::new(item_tree)
+        if item_tree.data.is_none() && item_tree.top_level.is_empty() && item_tree.attrs.is_empty()
+        {
+            EMPTY
+                .get_or_init(|| {
+                    Arc::new(ItemTree {
+                        top_level: SmallVec::new_const(),
+                        attrs: FxHashMap::default(),
+                        data: None,
+                    })
+                })
+                .clone()
+        } else {
+            item_tree.shrink_to_fit();
+            Arc::new(item_tree)
+        }
     }
 
     pub(crate) fn block_item_tree_query(db: &dyn DefDatabase, block: BlockId) -> Arc<ItemTree> {
+        let _p = tracing::info_span!("block_item_tree_query", ?block).entered();
+        static EMPTY: OnceCell<Arc<ItemTree>> = OnceCell::new();
+
         let loc = block.lookup(db);
         let block = loc.ast_id.to_node(db.upcast());
 
         let ctx = lower::Ctx::new(db, loc.ast_id.file_id);
         let mut item_tree = ctx.lower_block(&block);
-        item_tree.shrink_to_fit();
-        Arc::new(item_tree)
+        if item_tree.data.is_none() && item_tree.top_level.is_empty() && item_tree.attrs.is_empty()
+        {
+            EMPTY
+                .get_or_init(|| {
+                    Arc::new(ItemTree {
+                        top_level: SmallVec::new_const(),
+                        attrs: FxHashMap::default(),
+                        data: None,
+                    })
+                })
+                .clone()
+        } else {
+            item_tree.shrink_to_fit();
+            Arc::new(item_tree)
+        }
     }
 
     /// Returns an iterator over all items located at the top level of the `HirFileId` this
@@ -585,24 +616,30 @@ impl Index<RawVisibilityId> for ItemTree {
     type Output = RawVisibility;
     fn index(&self, index: RawVisibilityId) -> &Self::Output {
         static VIS_PUB: RawVisibility = RawVisibility::Public;
-        static VIS_PRIV_IMPLICIT: RawVisibility = RawVisibility::Module(
-            ModPath::from_kind(PathKind::SELF),
-            VisibilityExplicitness::Implicit,
-        );
-        static VIS_PRIV_EXPLICIT: RawVisibility = RawVisibility::Module(
-            ModPath::from_kind(PathKind::SELF),
-            VisibilityExplicitness::Explicit,
-        );
-        static VIS_PUB_CRATE: RawVisibility = RawVisibility::Module(
-            ModPath::from_kind(PathKind::Crate),
-            VisibilityExplicitness::Explicit,
-        );
+        static VIS_PRIV_IMPLICIT: OnceCell<RawVisibility> = OnceCell::new();
+        static VIS_PRIV_EXPLICIT: OnceCell<RawVisibility> = OnceCell::new();
+        static VIS_PUB_CRATE: OnceCell<RawVisibility> = OnceCell::new();
 
         match index {
-            RawVisibilityId::PRIV_IMPLICIT => &VIS_PRIV_IMPLICIT,
-            RawVisibilityId::PRIV_EXPLICIT => &VIS_PRIV_EXPLICIT,
+            RawVisibilityId::PRIV_IMPLICIT => VIS_PRIV_IMPLICIT.get_or_init(|| {
+                RawVisibility::Module(
+                    Interned::new(ModPath::from_kind(PathKind::SELF)),
+                    VisibilityExplicitness::Implicit,
+                )
+            }),
+            RawVisibilityId::PRIV_EXPLICIT => VIS_PRIV_EXPLICIT.get_or_init(|| {
+                RawVisibility::Module(
+                    Interned::new(ModPath::from_kind(PathKind::SELF)),
+                    VisibilityExplicitness::Explicit,
+                )
+            }),
             RawVisibilityId::PUB => &VIS_PUB,
-            RawVisibilityId::PUB_CRATE => &VIS_PUB_CRATE,
+            RawVisibilityId::PUB_CRATE => VIS_PUB_CRATE.get_or_init(|| {
+                RawVisibility::Module(
+                    Interned::new(ModPath::from_kind(PathKind::Crate)),
+                    VisibilityExplicitness::Explicit,
+                )
+            }),
             _ => &self.data().vis.arena[Idx::from_raw(index.0.into())],
         }
     }

src/tools/rust-analyzer/crates/hir-def/src/lib.rs

@@ -689,7 +689,7 @@ pub enum TypeOwnerId {
 }
 
 impl TypeOwnerId {
-    fn as_generic_def_id(self) -> Option<GenericDefId> {
+    fn as_generic_def_id(self, db: &dyn DefDatabase) -> Option<GenericDefId> {
         Some(match self {
             TypeOwnerId::FunctionId(it) => GenericDefId::FunctionId(it),
             TypeOwnerId::ConstId(it) => GenericDefId::ConstId(it),
@@ -698,7 +698,9 @@ impl TypeOwnerId {
             TypeOwnerId::TraitAliasId(it) => GenericDefId::TraitAliasId(it),
             TypeOwnerId::TypeAliasId(it) => GenericDefId::TypeAliasId(it),
             TypeOwnerId::ImplId(it) => GenericDefId::ImplId(it),
-            TypeOwnerId::EnumVariantId(it) => GenericDefId::EnumVariantId(it),
+            TypeOwnerId::EnumVariantId(it) => {
+                GenericDefId::AdtId(AdtId::EnumId(it.lookup(db).parent))
+            }
             TypeOwnerId::InTypeConstId(_) | TypeOwnerId::StaticId(_) => return None,
         })
     }
@@ -740,7 +742,6 @@ impl From<GenericDefId> for TypeOwnerId {
             GenericDefId::TraitAliasId(it) => it.into(),
             GenericDefId::TypeAliasId(it) => it.into(),
             GenericDefId::ImplId(it) => it.into(),
-            GenericDefId::EnumVariantId(it) => it.into(),
             GenericDefId::ConstId(it) => it.into(),
         }
     }
@@ -849,8 +850,8 @@ impl GeneralConstId {
     pub fn generic_def(self, db: &dyn DefDatabase) -> Option<GenericDefId> {
         match self {
             GeneralConstId::ConstId(it) => Some(it.into()),
-            GeneralConstId::ConstBlockId(it) => it.lookup(db).parent.as_generic_def_id(),
-            GeneralConstId::InTypeConstId(it) => it.lookup(db).owner.as_generic_def_id(),
+            GeneralConstId::ConstBlockId(it) => it.lookup(db).parent.as_generic_def_id(db),
+            GeneralConstId::InTypeConstId(it) => it.lookup(db).owner.as_generic_def_id(db),
         }
     }
 
@@ -888,12 +889,12 @@ impl From<EnumVariantId> for DefWithBodyId {
 }
 
 impl DefWithBodyId {
-    pub fn as_generic_def_id(self) -> Option<GenericDefId> {
+    pub fn as_generic_def_id(self, db: &dyn DefDatabase) -> Option<GenericDefId> {
         match self {
             DefWithBodyId::FunctionId(f) => Some(f.into()),
             DefWithBodyId::StaticId(_) => None,
             DefWithBodyId::ConstId(c) => Some(c.into()),
-            DefWithBodyId::VariantId(c) => Some(c.into()),
+            DefWithBodyId::VariantId(c) => Some(c.lookup(db).parent.into()),
             // FIXME: stable rust doesn't allow generics in constants, but we should
             // use `TypeOwnerId::as_generic_def_id` when it does.
             DefWithBodyId::InTypeConstId(_) => None,
@@ -921,10 +922,6 @@ pub enum GenericDefId {
     TraitAliasId(TraitAliasId),
     TypeAliasId(TypeAliasId),
     ImplId(ImplId),
-    // enum variants cannot have generics themselves, but their parent enums
-    // can, and this makes some code easier to write
-    // FIXME: Try to remove this as that will reduce the amount of query slots generated per enum?
-    EnumVariantId(EnumVariantId),
     // consts can have type parameters from their parents (i.e. associated consts of traits)
     ConstId(ConstId),
 }
@@ -935,7 +932,6 @@ impl_from!(
     TraitAliasId,
     TypeAliasId,
     ImplId,
-    EnumVariantId,
     ConstId
     for GenericDefId
 );
@@ -967,7 +963,6 @@ impl GenericDefId {
             GenericDefId::TraitAliasId(it) => file_id_and_params_of_item_loc(db, it),
             GenericDefId::ImplId(it) => file_id_and_params_of_item_loc(db, it),
             GenericDefId::ConstId(it) => (it.lookup(db).id.file_id(), None),
-            GenericDefId::EnumVariantId(it) => (it.lookup(db).id.file_id(), None),
         }
     }
 
@@ -982,6 +977,14 @@ impl GenericDefId {
             _ => None,
         }
     }
+
+    pub fn from_callable(db: &dyn DefDatabase, def: CallableDefId) -> GenericDefId {
+        match def {
+            CallableDefId::FunctionId(f) => f.into(),
+            CallableDefId::StructId(s) => s.into(),
+            CallableDefId::EnumVariantId(e) => e.lookup(db).parent.into(),
+        }
+    }
 }
 
 impl From<AssocItemId> for GenericDefId {
@@ -994,6 +997,36 @@ impl From<AssocItemId> for GenericDefId {
     }
 }
 
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum CallableDefId {
+    FunctionId(FunctionId),
+    StructId(StructId),
+    EnumVariantId(EnumVariantId),
+}
+
+impl InternValueTrivial for CallableDefId {}
+
+impl_from!(FunctionId, StructId, EnumVariantId for CallableDefId);
+impl From<CallableDefId> for ModuleDefId {
+    fn from(def: CallableDefId) -> ModuleDefId {
+        match def {
+            CallableDefId::FunctionId(f) => ModuleDefId::FunctionId(f),
+            CallableDefId::StructId(s) => ModuleDefId::AdtId(AdtId::StructId(s)),
+            CallableDefId::EnumVariantId(e) => ModuleDefId::EnumVariantId(e),
+        }
+    }
+}
+
+impl CallableDefId {
+    pub fn krate(self, db: &dyn DefDatabase) -> CrateId {
+        match self {
+            CallableDefId::FunctionId(f) => f.krate(db),
+            CallableDefId::StructId(s) => s.krate(db),
+            CallableDefId::EnumVariantId(e) => e.krate(db),
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub enum AttrDefId {
     ModuleId(ModuleId),
@@ -1310,7 +1343,6 @@ impl HasModule for GenericDefId {
             GenericDefId::TraitAliasId(it) => it.module(db),
             GenericDefId::TypeAliasId(it) => it.module(db),
             GenericDefId::ImplId(it) => it.module(db),
-            GenericDefId::EnumVariantId(it) => it.module(db),
             GenericDefId::ConstId(it) => it.module(db),
         }
     }

src/tools/rust-analyzer/crates/hir-def/src/nameres.rs

@@ -103,12 +103,13 @@ const PREDEFINED_TOOLS: &[SmolStr] = &[
 /// is computed by the `block_def_map` query.
 #[derive(Debug, PartialEq, Eq)]
 pub struct DefMap {
+    /// The crate this `DefMap` belongs to.
+    krate: CrateId,
     /// When this is a block def map, this will hold the block id of the block and module that
     /// contains this block.
     block: Option<BlockInfo>,
     /// The modules and their data declared in this crate.
     pub modules: Arena<ModuleData>,
-    krate: CrateId,
     /// The prelude module for this crate. This either comes from an import
     /// marked with the `prelude_import` attribute, or (in the normal case) from
     /// a dependency (`std` or `core`).
@@ -124,6 +125,7 @@ pub struct DefMap {
 
     /// Tracks which custom derives are in scope for an item, to allow resolution of derive helper
     /// attributes.
+    // FIXME: Figure out a better way for the IDE layer to resolve these?
     derive_helpers_in_scope: FxHashMap<AstId<ast::Item>, Vec<(Name, MacroId, MacroCallId)>>,
 
     /// The diagnostics that need to be emitted for this crate.

src/tools/rust-analyzer/crates/hir-def/src/resolver.rs

@@ -1164,7 +1164,6 @@ impl HasResolver for GenericDefId {
             GenericDefId::TraitAliasId(inner) => inner.resolver(db),
             GenericDefId::TypeAliasId(inner) => inner.resolver(db),
             GenericDefId::ImplId(inner) => inner.resolver(db),
-            GenericDefId::EnumVariantId(inner) => inner.resolver(db),
             GenericDefId::ConstId(inner) => inner.resolver(db),
         }
     }

src/tools/rust-analyzer/crates/hir-def/src/visibility.rs

@@ -2,6 +2,7 @@
 
 use std::iter;
 
+use intern::Interned;
 use la_arena::ArenaMap;
 use span::SyntaxContextId;
 use syntax::ast;
@@ -20,14 +21,17 @@ use crate::{
 pub enum RawVisibility {
     /// `pub(in module)`, `pub(crate)` or `pub(super)`. Also private, which is
     /// equivalent to `pub(self)`.
-    Module(ModPath, VisibilityExplicitness),
+    Module(Interned<ModPath>, VisibilityExplicitness),
     /// `pub`.
     Public,
 }
 
 impl RawVisibility {
-    pub(crate) const fn private() -> RawVisibility {
-        RawVisibility::Module(ModPath::from_kind(PathKind::SELF), VisibilityExplicitness::Implicit)
+    pub(crate) fn private() -> RawVisibility {
+        RawVisibility::Module(
+            Interned::new(ModPath::from_kind(PathKind::SELF)),
+            VisibilityExplicitness::Implicit,
+        )
     }
 
     pub(crate) fn from_ast(
@@ -60,7 +64,7 @@ impl RawVisibility {
             ast::VisibilityKind::PubSelf => ModPath::from_kind(PathKind::SELF),
             ast::VisibilityKind::Pub => return RawVisibility::Public,
         };
-        RawVisibility::Module(path, VisibilityExplicitness::Explicit)
+        RawVisibility::Module(Interned::new(path), VisibilityExplicitness::Explicit)
     }
 
     pub fn resolve(

src/tools/rust-analyzer/crates/hir-expand/src/change.rs

@@ -25,7 +25,8 @@ impl ChangeWithProcMacros {
 
     pub fn apply(self, db: &mut (impl ExpandDatabase + SourceDatabaseExt)) {
         self.source_change.apply(db);
-        if let Some(proc_macros) = self.proc_macros {
+        if let Some(mut proc_macros) = self.proc_macros {
+            proc_macros.shrink_to_fit();
             db.set_proc_macros_with_durability(Arc::new(proc_macros), Durability::HIGH);
         }
         if let Some(target_data_layouts) = self.target_data_layouts {