Support atomic fence intrinsic

Author: HKalbasi

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

@@ -2521,12 +2521,16 @@ fn const_trait_assoc() {
     );
     check_number(
         r#"
-    //- minicore: size_of
+    //- minicore: size_of, fn
     //- /a/lib.rs crate:a
     use core::mem::size_of;
     pub struct S<T>(T);
     impl<T> S<T> {
-        pub const X: usize = core::mem::size_of::<T>();
+        pub const X: usize = {
+            let k: T;
+            let f = || core::mem::size_of::<T>();
+            f()
+        };
     }
     //- /main.rs crate:main deps:a
     use a::{S};

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

@@ -438,6 +438,8 @@ fn atomic() {
             pub fn atomic_nand_seqcst<T: Copy>(dst: *mut T, src: T) -> T;
             pub fn atomic_or_release<T: Copy>(dst: *mut T, src: T) -> T;
             pub fn atomic_xor_seqcst<T: Copy>(dst: *mut T, src: T) -> T;
+            pub fn atomic_fence_seqcst();
+            pub fn atomic_singlethreadfence_acqrel();
         }
 
         fn should_not_reach() {
@@ -452,13 +454,15 @@ fn atomic() {
             if (30, true) != atomic_cxchg_release_seqcst(&mut y, 30, 40) {
                 should_not_reach();
             }
+            atomic_fence_seqcst();
             if (40, false) != atomic_cxchg_release_seqcst(&mut y, 30, 50) {
                 should_not_reach();
             }
             if (40, true) != atomic_cxchgweak_acquire_acquire(&mut y, 40, 30) {
                 should_not_reach();
             }
             let mut z = atomic_xsub_seqcst(&mut x, -200);
+            atomic_singlethreadfence_acqrel();
             atomic_xor_seqcst(&mut x, 1024);
             atomic_load_seqcst(&x) + z * 3 + atomic_load_seqcst(&y) * 2
         };

crates/hir-ty/src/mir/eval.rs

@@ -702,9 +702,7 @@ impl Evaluator<'_> {
     }
 
     fn layout_adt(&self, adt: AdtId, subst: Substitution) -> Result<Arc<Layout>> {
-        self.db.layout_of_adt(adt, subst.clone(), self.trait_env.clone()).map_err(|e| {
-            MirEvalError::LayoutError(e, TyKind::Adt(chalk_ir::AdtId(adt), subst).intern(Interner))
-        })
+        self.layout(&TyKind::Adt(chalk_ir::AdtId(adt), subst).intern(Interner))
     }
 
     fn place_ty<'a>(&'a self, p: &Place, locals: &'a Locals) -> Result<Ty> {

crates/hir-ty/src/mir/eval/shim.rs

@@ -1057,7 +1057,14 @@ impl Evaluator<'_> {
         _span: MirSpan,
     ) -> Result<()> {
         // We are a single threaded runtime with no UB checking and no optimization, so
-        // we can implement these as normal functions.
+        // we can implement atomic intrinsics as normal functions.
+
+        if name.starts_with("singlethreadfence_") || name.starts_with("fence_") {
+            return Ok(());
+        }
+
+        // The rest of atomic intrinsics have exactly one generic arg
+
         let Some(ty) = generic_args.as_slice(Interner).get(0).and_then(|it| it.ty(Interner)) else {
             return Err(MirEvalError::TypeError("atomic intrinsic generic arg is not provided"));
         };

crates/hir-ty/src/mir/lower.rs

@@ -660,6 +660,11 @@ impl<'ctx> MirLowerCtx<'ctx> {
                             expr_id.into(),
                         )
                     }
+                    TyKind::Closure(_, _) => {
+                        not_supported!(
+                            "method resolution not emitted for closure (Are Fn traits available?)"
+                        );
+                    }
                     TyKind::Error => {
                         return Err(MirLowerError::MissingFunctionDefinition(self.owner, expr_id))
                     }