Auto merge of #120991 - matthiaskrgr:rollup-f8kw2st, r=matthiaskrgr

Rollup of 8 pull requests

Successful merges:

 - #118983 (Warn on references casting to bigger memory layout)
 - #119451 (Gate PR CI on clippy correctness lints)
 - #120273 (compiletest: few naive improvements)
 - #120950 (Fix async closures in CTFE)
 - #120958 (Dejargonize `subst`)
 - #120965 (Add lahfsahf and prfchw target feature)
 - #120970 (add another test for promoteds-in-static)
 - #120979 (Update books)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -691,7 +691,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
 
         // If the type is opaque/param/closure, and it is Fn or FnMut, let's suggest (mutably)
         // borrowing the type, since `&mut F: FnMut` iff `F: FnMut` and similarly for `Fn`.
-        // These types seem reasonably opaque enough that they could be substituted with their
+        // These types seem reasonably opaque enough that they could be instantiated with their
         // borrowed variants in a function body when we see a move error.
         let borrow_level = match *ty.kind() {
             ty::Param(_) => tcx
@@ -3158,7 +3158,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
     ) -> Option<AnnotatedBorrowFnSignature<'tcx>> {
         // Define a fallback for when we can't match a closure.
         let fallback = || {
-            let is_closure = self.infcx.tcx.is_closure_or_coroutine(self.mir_def_id().to_def_id());
+            let is_closure = self.infcx.tcx.is_closure_like(self.mir_def_id().to_def_id());
             if is_closure {
                 None
             } else {
@@ -3369,7 +3369,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         sig: ty::PolyFnSig<'tcx>,
     ) -> Option<AnnotatedBorrowFnSignature<'tcx>> {
         debug!("annotate_fn_sig: did={:?} sig={:?}", did, sig);
-        let is_closure = self.infcx.tcx.is_closure_or_coroutine(did.to_def_id());
+        let is_closure = self.infcx.tcx.is_closure_like(did.to_def_id());
         let fn_hir_id = self.infcx.tcx.local_def_id_to_hir_id(did);
         let fn_decl = self.infcx.tcx.hir().fn_decl_by_hir_id(fn_hir_id)?;
 

compiler/rustc_borrowck/src/diagnostics/mutability_errors.rs

@@ -67,7 +67,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 local,
                 projection: [proj_base @ .., ProjectionElem::Field(upvar_index, _)],
             } => {
-                debug_assert!(is_closure_or_coroutine(
+                debug_assert!(is_closure_like(
                     Place::ty_from(local, proj_base, self.body, self.infcx.tcx).ty
                 ));
 
@@ -126,9 +126,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 {
                     item_msg = access_place_desc;
                     debug_assert!(self.body.local_decls[ty::CAPTURE_STRUCT_LOCAL].ty.is_ref());
-                    debug_assert!(is_closure_or_coroutine(
-                        the_place_err.ty(self.body, self.infcx.tcx).ty
-                    ));
+                    debug_assert!(is_closure_like(the_place_err.ty(self.body, self.infcx.tcx).ty));
 
                     reason = if self.is_upvar_field_projection(access_place.as_ref()).is_some() {
                         ", as it is a captured variable in a `Fn` closure".to_string()
@@ -389,7 +387,7 @@ impl<'a, 'tcx> MirBorrowckCtxt<'a, 'tcx> {
                 local,
                 projection: [proj_base @ .., ProjectionElem::Field(upvar_index, _)],
             } => {
-                debug_assert!(is_closure_or_coroutine(
+                debug_assert!(is_closure_like(
                     Place::ty_from(local, proj_base, self.body, self.infcx.tcx).ty
                 ));
 
@@ -1474,7 +1472,8 @@ fn suggest_ampmut<'tcx>(
     }
 }
 
-fn is_closure_or_coroutine(ty: Ty<'_>) -> bool {
+/// If the type is a `Coroutine`, `Closure`, or `CoroutineClosure`
+fn is_closure_like(ty: Ty<'_>) -> bool {
     ty.is_closure() || ty.is_coroutine() || ty.is_coroutine_closure()
 }
 

compiler/rustc_borrowck/src/region_infer/opaque_types.rs

@@ -45,7 +45,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// be allowed:
     /// `fn f<'a: 'b, 'b: 'a>(x: *mut &'b i32) -> impl Sized + 'a { x }`
     ///
-    /// Then we map the regions in both the type and the subst to their
+    /// Then we map the regions in both the type and the generic parameters to their
     /// `external_name` giving `concrete_type = &'a i32`,
     /// `args = ['static, 'a]`. This will then allow
     /// `infer_opaque_definition_from_instantiation` to determine that
@@ -77,9 +77,9 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             let args = opaque_type_key.args;
             debug!(?concrete_type, ?args);
 
-            let mut subst_regions = vec![self.universal_regions.fr_static];
+            let mut arg_regions = vec![self.universal_regions.fr_static];
 
-            let to_universal_region = |vid, subst_regions: &mut Vec<_>| {
+            let to_universal_region = |vid, arg_regions: &mut Vec<_>| {
                 trace!(?vid);
                 let scc = self.constraint_sccs.scc(vid);
                 trace!(?scc);
@@ -88,11 +88,11 @@ impl<'tcx> RegionInferenceContext<'tcx> {
                 }) {
                     Some(region) => {
                         let vid = self.universal_regions.to_region_vid(region);
-                        subst_regions.push(vid);
+                        arg_regions.push(vid);
                         region
                     }
                     None => {
-                        subst_regions.push(vid);
+                        arg_regions.push(vid);
                         ty::Region::new_error_with_message(
                             infcx.tcx,
                             concrete_type.span,
@@ -106,10 +106,10 @@ impl<'tcx> RegionInferenceContext<'tcx> {
             // This will ensure they get precedence when folding the regions in the concrete type.
             if let Some(&ci) = member_constraints.get(&opaque_type_key) {
                 for &vid in self.member_constraints.choice_regions(ci) {
-                    to_universal_region(vid, &mut subst_regions);
+                    to_universal_region(vid, &mut arg_regions);
                 }
             }
-            debug!(?subst_regions);
+            debug!(?arg_regions);
 
             // Next, insert universal regions from args, so we can translate regions that appear
             // in them but are not subject to member constraints, for instance closure args.
@@ -119,18 +119,18 @@ impl<'tcx> RegionInferenceContext<'tcx> {
                     return region;
                 }
                 let vid = self.to_region_vid(region);
-                to_universal_region(vid, &mut subst_regions)
+                to_universal_region(vid, &mut arg_regions)
             });
             debug!(?universal_args);
-            debug!(?subst_regions);
+            debug!(?arg_regions);
 
             // Deduplicate the set of regions while keeping the chosen order.
-            let subst_regions = subst_regions.into_iter().collect::<FxIndexSet<_>>();
-            debug!(?subst_regions);
+            let arg_regions = arg_regions.into_iter().collect::<FxIndexSet<_>>();
+            debug!(?arg_regions);
 
             let universal_concrete_type =
                 infcx.tcx.fold_regions(concrete_type, |region, _| match *region {
-                    ty::ReVar(vid) => subst_regions
+                    ty::ReVar(vid) => arg_regions
                         .iter()
                         .find(|ur_vid| self.eval_equal(vid, **ur_vid))
                         .and_then(|ur_vid| self.definitions[*ur_vid].external_name)

compiler/rustc_borrowck/src/type_check/input_output.rs

@@ -29,7 +29,7 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
     pub(super) fn check_signature_annotation(&mut self, body: &Body<'tcx>) {
         let mir_def_id = body.source.def_id().expect_local();
 
-        if !self.tcx().is_closure_or_coroutine(mir_def_id.to_def_id()) {
+        if !self.tcx().is_closure_like(mir_def_id.to_def_id()) {
             return;
         }
 

compiler/rustc_codegen_llvm/src/attributes.rs

@@ -479,7 +479,7 @@ pub fn from_fn_attrs<'ll, 'tcx>(
         // `+multivalue` feature because the purpose of the wasm abi is to match
         // the WebAssembly specification, which has this feature. This won't be
         // needed when LLVM enables this `multivalue` feature by default.
-        if !cx.tcx.is_closure_or_coroutine(instance.def_id()) {
+        if !cx.tcx.is_closure_like(instance.def_id()) {
             let abi = cx.tcx.fn_sig(instance.def_id()).skip_binder().abi();
             if abi == Abi::Wasm {
                 function_features.push("+multivalue".to_string());

compiler/rustc_codegen_llvm/src/llvm_util.rs

@@ -213,6 +213,7 @@ pub fn to_llvm_features<'a>(sess: &Session, s: &'a str) -> LLVMFeature<'a> {
         ("x86", "rdrand") => LLVMFeature::new("rdrnd"),
         ("x86", "bmi1") => LLVMFeature::new("bmi"),
         ("x86", "cmpxchg16b") => LLVMFeature::new("cx16"),
+        ("x86", "lahfsahf") => LLVMFeature::new("sahf"),
         ("aarch64", "rcpc2") => LLVMFeature::new("rcpc-immo"),
         ("aarch64", "dpb") => LLVMFeature::new("ccpp"),
         ("aarch64", "dpb2") => LLVMFeature::new("ccdp"),

compiler/rustc_codegen_ssa/src/codegen_attrs.rs

@@ -229,7 +229,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
             }
             sym::thread_local => codegen_fn_attrs.flags |= CodegenFnAttrFlags::THREAD_LOCAL,
             sym::track_caller => {
-                let is_closure = tcx.is_closure_or_coroutine(did.to_def_id());
+                let is_closure = tcx.is_closure_like(did.to_def_id());
 
                 if !is_closure
                     && let Some(fn_sig) = fn_sig()
@@ -274,7 +274,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
                 }
             }
             sym::target_feature => {
-                if !tcx.is_closure_or_coroutine(did.to_def_id())
+                if !tcx.is_closure_like(did.to_def_id())
                     && let Some(fn_sig) = fn_sig()
                     && fn_sig.skip_binder().unsafety() == hir::Unsafety::Normal
                 {
@@ -529,7 +529,7 @@ fn codegen_fn_attrs(tcx: TyCtxt<'_>, did: LocalDefId) -> CodegenFnAttrs {
     // would result in this closure being compiled without the inherited target features, but this
     // is probably a poor usage of `#[inline(always)]` and easily avoided by not using the attribute.
     if tcx.features().target_feature_11
-        && tcx.is_closure_or_coroutine(did.to_def_id())
+        && tcx.is_closure_like(did.to_def_id())
         && codegen_fn_attrs.inline != InlineAttr::Always
     {
         let owner_id = tcx.parent(did.to_def_id());

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -77,6 +77,8 @@ pub fn from_target_feature(
                 Some(sym::aarch64_ver_target_feature) => rust_features.aarch64_ver_target_feature,
                 Some(sym::csky_target_feature) => rust_features.csky_target_feature,
                 Some(sym::loongarch_target_feature) => rust_features.loongarch_target_feature,
+                Some(sym::lahfsahf_target_feature) => rust_features.lahfsahf_target_feature,
+                Some(sym::prfchw_target_feature) => rust_features.prfchw_target_feature,
                 Some(name) => bug!("unknown target feature gate {}", name),
                 None => true,
             };

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -554,18 +554,20 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
 
     /// Call this on things you got out of the MIR (so it is as generic as the current
     /// stack frame), to bring it into the proper environment for this interpreter.
-    pub(super) fn subst_from_current_frame_and_normalize_erasing_regions<
+    pub(super) fn instantiate_from_current_frame_and_normalize_erasing_regions<
         T: TypeFoldable<TyCtxt<'tcx>>,
     >(
         &self,
         value: T,
     ) -> Result<T, ErrorHandled> {
-        self.subst_from_frame_and_normalize_erasing_regions(self.frame(), value)
+        self.instantiate_from_frame_and_normalize_erasing_regions(self.frame(), value)
     }
 
     /// Call this on things you got out of the MIR (so it is as generic as the provided
     /// stack frame), to bring it into the proper environment for this interpreter.
-    pub(super) fn subst_from_frame_and_normalize_erasing_regions<T: TypeFoldable<TyCtxt<'tcx>>>(
+    pub(super) fn instantiate_from_frame_and_normalize_erasing_regions<
+        T: TypeFoldable<TyCtxt<'tcx>>,
+    >(
         &self,
         frame: &Frame<'mir, 'tcx, M::Provenance, M::FrameExtra>,
         value: T,
@@ -656,7 +658,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
 
         let layout = from_known_layout(self.tcx, self.param_env, layout, || {
             let local_ty = frame.body.local_decls[local].ty;
-            let local_ty = self.subst_from_frame_and_normalize_erasing_regions(frame, local_ty)?;
+            let local_ty =
+                self.instantiate_from_frame_and_normalize_erasing_regions(frame, local_ty)?;
             self.layout_of(local_ty)
         })?;
 
@@ -791,8 +794,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         // Make sure all the constants required by this frame evaluate successfully (post-monomorphization check).
         if M::POST_MONO_CHECKS {
             for &const_ in &body.required_consts {
-                let c =
-                    self.subst_from_current_frame_and_normalize_erasing_regions(const_.const_)?;
+                let c = self
+                    .instantiate_from_current_frame_and_normalize_erasing_regions(const_.const_)?;
                 c.eval(*self.tcx, self.param_env, Some(const_.span)).map_err(|err| {
                     err.emit_note(*self.tcx);
                     err

compiler/rustc_const_eval/src/interpret/operand.rs

@@ -696,9 +696,10 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
         trace!("eval_place_to_op: got {:?}", op);
         // Sanity-check the type we ended up with.
         if cfg!(debug_assertions) {
-            let normalized_place_ty = self.subst_from_current_frame_and_normalize_erasing_regions(
-                mir_place.ty(&self.frame().body.local_decls, *self.tcx).ty,
-            )?;
+            let normalized_place_ty = self
+                .instantiate_from_current_frame_and_normalize_erasing_regions(
+                    mir_place.ty(&self.frame().body.local_decls, *self.tcx).ty,
+                )?;
             if !mir_assign_valid_types(
                 *self.tcx,
                 self.param_env,
@@ -731,8 +732,9 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             &Copy(place) | &Move(place) => self.eval_place_to_op(place, layout)?,
 
             Constant(constant) => {
-                let c =
-                    self.subst_from_current_frame_and_normalize_erasing_regions(constant.const_)?;
+                let c = self.instantiate_from_current_frame_and_normalize_erasing_regions(
+                    constant.const_,
+                )?;
 
                 // This can still fail:
                 // * During ConstProp, with `TooGeneric` or since the `required_consts` were not all

compiler/rustc_const_eval/src/interpret/place.rs

@@ -542,9 +542,10 @@ where
         trace!("{:?}", self.dump_place(&place));
         // Sanity-check the type we ended up with.
         if cfg!(debug_assertions) {
-            let normalized_place_ty = self.subst_from_current_frame_and_normalize_erasing_regions(
-                mir_place.ty(&self.frame().body.local_decls, *self.tcx).ty,
-            )?;
+            let normalized_place_ty = self
+                .instantiate_from_current_frame_and_normalize_erasing_regions(
+                    mir_place.ty(&self.frame().body.local_decls, *self.tcx).ty,
+                )?;
             if !mir_assign_valid_types(
                 *self.tcx,
                 self.param_env,

compiler/rustc_const_eval/src/interpret/step.rs

@@ -235,7 +235,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             }
 
             NullaryOp(ref null_op, ty) => {
-                let ty = self.subst_from_current_frame_and_normalize_erasing_regions(ty)?;
+                let ty = self.instantiate_from_current_frame_and_normalize_erasing_regions(ty)?;
                 let layout = self.layout_of(ty)?;
                 if let mir::NullOp::SizeOf | mir::NullOp::AlignOf = null_op
                     && layout.is_unsized()
@@ -276,7 +276,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             Cast(cast_kind, ref operand, cast_ty) => {
                 let src = self.eval_operand(operand, None)?;
                 let cast_ty =
-                    self.subst_from_current_frame_and_normalize_erasing_regions(cast_ty)?;
+                    self.instantiate_from_current_frame_and_normalize_erasing_regions(cast_ty)?;
                 self.cast(&src, cast_kind, cast_ty, &dest)?;
             }
 

compiler/rustc_const_eval/src/interpret/terminator.rs

@@ -173,7 +173,7 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
             Drop { place, target, unwind, replace: _ } => {
                 let frame = self.frame();
                 let ty = place.ty(&frame.body.local_decls, *self.tcx).ty;
-                let ty = self.subst_from_frame_and_normalize_erasing_regions(frame, ty)?;
+                let ty = self.instantiate_from_frame_and_normalize_erasing_regions(frame, ty)?;
                 let instance = Instance::resolve_drop_in_place(*self.tcx, ty);
                 if let ty::InstanceDef::DropGlue(_, None) = instance.def {
                     // This is the branch we enter if and only if the dropped type has no drop glue
@@ -672,8 +672,8 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                         // Construct the destination place for this argument. At this point all
                         // locals are still dead, so we cannot construct a `PlaceTy`.
                         let dest = mir::Place::from(local);
-                        // `layout_of_local` does more than just the substitution we need to get the
-                        // type, but the result gets cached so this avoids calling the substitution
+                        // `layout_of_local` does more than just the instantiation we need to get the
+                        // type, but the result gets cached so this avoids calling the instantiation
                         // query *again* the next time this local is accessed.
                         let ty = self.layout_of_local(self.frame(), local, None)?.ty;
                         if Some(local) == body.spread_arg {

compiler/rustc_const_eval/src/interpret/util.rs

@@ -19,11 +19,11 @@ where
     }
 
     struct FoundParam;
-    struct UsedParamsNeedSubstVisitor<'tcx> {
+    struct UsedParamsNeedInstantiationVisitor<'tcx> {
         tcx: TyCtxt<'tcx>,
     }
 
-    impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for UsedParamsNeedSubstVisitor<'tcx> {
+    impl<'tcx> TypeVisitor<TyCtxt<'tcx>> for UsedParamsNeedInstantiationVisitor<'tcx> {
         type BreakTy = FoundParam;
 
         fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {
@@ -34,21 +34,22 @@ where
             match *ty.kind() {
                 ty::Param(_) => ControlFlow::Break(FoundParam),
                 ty::Closure(def_id, args)
+                | ty::CoroutineClosure(def_id, args, ..)
                 | ty::Coroutine(def_id, args, ..)
                 | ty::FnDef(def_id, args) => {
                     let instance = ty::InstanceDef::Item(def_id);
                     let unused_params = self.tcx.unused_generic_params(instance);
-                    for (index, subst) in args.into_iter().enumerate() {
+                    for (index, arg) in args.into_iter().enumerate() {
                         let index = index
                             .try_into()
                             .expect("more generic parameters than can fit into a `u32`");
                         // Only recurse when generic parameters in fns, closures and coroutines
                         // are used and have to be instantiated.
                         //
-                        // Just in case there are closures or coroutines within this subst,
+                        // Just in case there are closures or coroutines within this arg,
                         // recurse.
-                        if unused_params.is_used(index) && subst.has_param() {
-                            return subst.visit_with(self);
+                        if unused_params.is_used(index) && arg.has_param() {
+                            return arg.visit_with(self);
                         }
                     }
                     ControlFlow::Continue(())
@@ -65,7 +66,7 @@ where
         }
     }
 
-    let mut vis = UsedParamsNeedSubstVisitor { tcx };
+    let mut vis = UsedParamsNeedInstantiationVisitor { tcx };
     if matches!(ty.visit_with(&mut vis), ControlFlow::Break(FoundParam)) {
         throw_inval!(TooGeneric);
     } else {