Switch to home-made db attaching infrastructure

Instead of using Salsa's, as we can no longer can a `dyn HirDatabase` from the `dyn salsa::Database` Salsa provides.

Author: ChayimFriedman2

Cargo.lock

@@ -137,13 +137,12 @@ rayon = "1.10.0"
 rowan = "=0.15.15"
 # Ideally we'd not enable the macros feature but unfortunately the `tracked` attribute does not work
 # on impls without it
-salsa = { git = "https://github.com/salsa-rs/salsa.git", rev = "e257df12eabd566825ba53bb12d782560b9a4dcd", default-features = true, features = [
+salsa = { version = "0.24.0", default-features = true, features = [
     "rayon",
     "salsa_unstable",
     "macros",
 ] }
-# salsa-macros = "0.23.0"
-salsa-macros = { git = "https://github.com/salsa-rs/salsa.git", rev = "e257df12eabd566825ba53bb12d782560b9a4dcd" }
+salsa-macros = "0.24.0"
 semver = "1.0.26"
 serde = { version = "1.0.219" }
 serde_derive = { version = "1.0.219" }

Cargo.toml

@@ -23,11 +23,7 @@ intern.workspace = true
 [dev-dependencies]
 expect-test = "1.5.1"
 oorandom = "11.1.5"
-# We depend on both individually instead of using `features = ["derive"]` to microoptimize the
-# build graph: if the feature was enabled, syn would be built early on in the graph if `smolstr`
-# supports `arbitrary`. This way, we avoid feature unification.
-arbitrary = "1.4.1"
-derive_arbitrary = "1.4.1"
+arbitrary = { version = "1.4.1", features = ["derive"] }
 
 # local deps
 syntax-bridge.workspace = true

crates/cfg/Cargo.toml

@@ -47,7 +47,7 @@ impl fmt::Display for CfgAtom {
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
-#[cfg_attr(test, derive(derive_arbitrary::Arbitrary))]
+#[cfg_attr(test, derive(arbitrary::Arbitrary))]
 pub enum CfgExpr {
     Invalid,
     Atom(CfgAtom),

crates/cfg/src/cfg_expr.rs

@@ -1,14 +1,13 @@
 //! Database used for testing `hir_def`.
 
-use salsa::database::AsDynDatabase;
 use std::{fmt, panic, sync::Mutex};
 
 use base_db::{
     Crate, CrateGraphBuilder, CratesMap, FileSourceRootInput, FileText, Nonce, RootQueryDb,
     SourceDatabase, SourceRoot, SourceRootId, SourceRootInput,
 };
 use hir_expand::{InFile, files::FilePosition};
-use salsa::{Durability, database::AsDynDatabase};
+use salsa::Durability;
 use span::FileId;
 use syntax::{AstNode, algo, ast};
 use triomphe::Arc;
@@ -304,8 +303,7 @@ impl TestDB {
                 // This is pretty horrible, but `Debug` is the only way to inspect
                 // QueryDescriptor at the moment.
                 salsa::EventKind::WillExecute { database_key } => {
-                    let ingredient = self
-                        .as_dyn_database()
+                    let ingredient = (self as &dyn salsa::Database)
                         .ingredient_debug_name(database_key.ingredient_index());
                     Some(ingredient.to_string())
                 }

crates/hir-def/src/test_db.rs

@@ -36,7 +36,7 @@ fn check_fail(
     error: impl FnOnce(ConstEvalError<'_>) -> bool,
 ) {
     let (db, file_id) = TestDB::with_single_file(ra_fixture);
-    salsa::attach(&db, || match eval_goal(&db, file_id) {
+    crate::attach_db(&db, || match eval_goal(&db, file_id) {
         Ok(_) => panic!("Expected fail, but it succeeded"),
         Err(e) => {
             assert!(error(simplify(e.clone())), "Actual error was: {}", pretty_print_err(e, &db))
@@ -79,7 +79,7 @@ fn check_answer(
     check: impl FnOnce(&[u8], &MemoryMap<'_>),
 ) {
     let (db, file_ids) = TestDB::with_many_files(ra_fixture);
-    salsa::attach(&db, || {
+    crate::attach_db(&db, || {
         let file_id = *file_ids.last().unwrap();
         let r = match eval_goal(&db, file_id) {
             Ok(t) => t,
@@ -2506,8 +2506,10 @@ fn enums() {
         const GOAL: E = E::A;
         "#,
     );
-    let r = eval_goal(&db, file_id).unwrap();
-    assert_eq!(try_const_usize(&db, &r), Some(1));
+    crate::attach_db(&db, || {
+        let r = eval_goal(&db, file_id).unwrap();
+        assert_eq!(try_const_usize(&db, &r), Some(1));
+    })
 }
 
 #[test]

crates/hir-ty/src/consteval/tests.rs

@@ -57,7 +57,7 @@ fn check_dyn_compatibility<'a>(
         };
         let mut osvs = FxHashSet::default();
         let db = &db;
-        salsa::attach(db, || {
+        crate::attach_db(db, || {
             _ = dyn_compatibility_with_callback(db, trait_id, &mut |osv| {
                 osvs.insert(match osv {
                     DynCompatibilityViolation::SizedSelf => SizedSelf,

crates/hir-ty/src/dyn_compatibility/tests.rs

@@ -400,7 +400,7 @@ fn pointer_kind<'db>(
                 Ok(Some(PointerKind::Thin))
             }
         }
-        TyKind::Tuple(subst) => match subst.iter().last() {
+        TyKind::Tuple(subst) => match subst.iter().next_back() {
             None => Ok(Some(PointerKind::Thin)),
             Some(ty) => pointer_kind(ty, ctx),
         },

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

@@ -385,7 +385,7 @@ fn struct_tail_erasing_lifetimes<'a>(db: &'a dyn HirDatabase, pointee: Ty<'a>) -
             }
         }
         TyKind::Tuple(tys) => {
-            if let Some(last_field_ty) = tys.iter().last() {
+            if let Some(last_field_ty) = tys.iter().next_back() {
                 struct_tail_erasing_lifetimes(db, last_field_ty)
             } else {
                 pointee

crates/hir-ty/src/layout.rs

@@ -79,7 +79,7 @@ fn eval_goal(
             Some(adt_or_type_alias_id)
         })
         .unwrap();
-    salsa::attach(&db, || {
+    crate::attach_db(&db, || {
         let interner = DbInterner::new_with(&db, None, None);
         let goal_ty = match adt_or_type_alias_id {
             Either::Left(adt_id) => crate::next_solver::Ty::new_adt(
@@ -112,29 +112,34 @@ fn eval_expr(
     );
 
     let (db, file_id) = TestDB::with_single_file(&ra_fixture);
-    let module_id = db.module_for_file(file_id.file_id(&db));
-    let def_map = module_id.def_map(&db);
-    let scope = &def_map[module_id.local_id].scope;
-    let function_id = scope
-        .declarations()
-        .find_map(|x| match x {
-            hir_def::ModuleDefId::FunctionId(x) => {
-                let name =
-                    db.function_signature(x).name.display_no_db(file_id.edition(&db)).to_smolstr();
-                (name == "main").then_some(x)
-            }
-            _ => None,
-        })
-        .unwrap();
-    let hir_body = db.body(function_id.into());
-    let b = hir_body
-        .bindings()
-        .find(|x| x.1.name.display_no_db(file_id.edition(&db)).to_smolstr() == "goal")
-        .unwrap()
-        .0;
-    let infer = db.infer(function_id.into());
-    let goal_ty = infer.type_of_binding[b];
-    salsa::attach(&db, || db.layout_of_ty(goal_ty, db.trait_environment(function_id.into())))
+    crate::attach_db(&db, || {
+        let module_id = db.module_for_file(file_id.file_id(&db));
+        let def_map = module_id.def_map(&db);
+        let scope = &def_map[module_id.local_id].scope;
+        let function_id = scope
+            .declarations()
+            .find_map(|x| match x {
+                hir_def::ModuleDefId::FunctionId(x) => {
+                    let name = db
+                        .function_signature(x)
+                        .name
+                        .display_no_db(file_id.edition(&db))
+                        .to_smolstr();
+                    (name == "main").then_some(x)
+                }
+                _ => None,
+            })
+            .unwrap();
+        let hir_body = db.body(function_id.into());
+        let b = hir_body
+            .bindings()
+            .find(|x| x.1.name.display_no_db(file_id.edition(&db)).to_smolstr() == "goal")
+            .unwrap()
+            .0;
+        let infer = db.infer(function_id.into());
+        let goal_ty = infer.type_of_binding[b];
+        db.layout_of_ty(goal_ty, db.trait_environment(function_id.into()))
+    })
 }
 
 #[track_caller]