Rollup of 7 pull requests

compiler/rustc_codegen_ssa/src/target_features.rs

@@ -249,6 +249,7 @@ const WASM_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[
     ("bulk-memory", Some(sym::wasm_target_feature)),
     ("mutable-globals", Some(sym::wasm_target_feature)),
     ("reference-types", Some(sym::wasm_target_feature)),
+    ("sign-ext", Some(sym::wasm_target_feature)),
 ];
 
 const BPF_ALLOWED_FEATURES: &[(&str, Option<Symbol>)] = &[("alu32", Some(sym::bpf_target_feature))];

compiler/rustc_mir_transform/src/check_packed_ref.rs

@@ -36,13 +36,16 @@ fn unsafe_derive_on_repr_packed(tcx: TyCtxt<'_>, def_id: LocalDefId) {
     tcx.struct_span_lint_hir(UNALIGNED_REFERENCES, lint_hir_id, tcx.def_span(def_id), |lint| {
         // FIXME: when we make this a hard error, this should have its
         // own error code.
-        let message = if tcx.generics_of(def_id).own_requires_monomorphization() {
-            "`#[derive]` can't be used on a `#[repr(packed)]` struct with \
-             type or const parameters (error E0133)"
+        let extra = if tcx.generics_of(def_id).own_requires_monomorphization() {
+            "with type or const parameters"
         } else {
-            "`#[derive]` can't be used on a `#[repr(packed)]` struct that \
-             does not derive Copy (error E0133)"
+            "that does not derive `Copy`"
         };
+        let message = format!(
+            "`{}` can't be derived on this `#[repr(packed)]` struct {} (error E0133)",
+            tcx.item_name(tcx.trait_id_of_impl(def_id.to_def_id()).expect("derived trait name")),
+            extra
+        );
         lint.build(message).emit();
     });
 }

compiler/rustc_typeck/src/collect/type_of.rs

@@ -538,9 +538,9 @@ fn find_opaque_ty_constraints(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Ty<'_> {
 
     impl ConstraintLocator<'_> {
         #[instrument(skip(self), level = "debug")]
-        fn check(&mut self, def_id: LocalDefId) {
+        fn check(&mut self, item_def_id: LocalDefId) {
             // Don't try to check items that cannot possibly constrain the type.
-            if !self.tcx.has_typeck_results(def_id) {
+            if !self.tcx.has_typeck_results(item_def_id) {
                 debug!("no constraint: no typeck results");
                 return;
             }
@@ -555,26 +555,20 @@ fn find_opaque_ty_constraints(tcx: TyCtxt<'_>, def_id: LocalDefId) -> Ty<'_> {
             // // because we again need to reveal `Foo` so we can check whether the
             // // constant does not contain interior mutability.
             // ```
-            let tables = self.tcx.typeck(def_id);
+            let tables = self.tcx.typeck(item_def_id);
             if let Some(_) = tables.tainted_by_errors {
                 self.found = Some(ty::OpaqueHiddenType { span: DUMMY_SP, ty: self.tcx.ty_error() });
                 return;
             }
-            if tables.concrete_opaque_types.get(&self.def_id).is_none() {
+            if !tables.concrete_opaque_types.contains_key(&self.def_id) {
                 debug!("no constraints in typeck results");
                 return;
             }
             // Use borrowck to get the type with unerased regions.
-            let concrete_opaque_types = &self.tcx.mir_borrowck(def_id).concrete_opaque_types;
+            let concrete_opaque_types = &self.tcx.mir_borrowck(item_def_id).concrete_opaque_types;
             debug!(?concrete_opaque_types);
-            for &(def_id, concrete_type) in concrete_opaque_types {
-                if def_id != self.def_id {
-                    // Ignore constraints for other opaque types.
-                    continue;
-                }
-
+            if let Some(&concrete_type) = concrete_opaque_types.get(&self.def_id) {
                 debug!(?concrete_type, "found constraint");
-
                 if let Some(prev) = self.found {
                     if concrete_type.ty != prev.ty && !(concrete_type, prev).references_error() {
                         prev.report_mismatch(&concrete_type, self.tcx);

library/core/src/hint.rs

@@ -96,6 +96,7 @@ use crate::intrinsics;
 #[inline]
 #[stable(feature = "unreachable", since = "1.27.0")]
 #[rustc_const_stable(feature = "const_unreachable_unchecked", since = "1.57.0")]
+#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
 pub const unsafe fn unreachable_unchecked() -> ! {
     // SAFETY: the safety contract for `intrinsics::unreachable` must
     // be upheld by the caller.

library/core/src/intrinsics.rs

@@ -2449,6 +2449,7 @@ pub(crate) fn is_nonoverlapping<T>(src: *const T, dst: *const T, count: usize) -
 #[cfg_attr(not(bootstrap), rustc_allowed_through_unstable_modules)]
 #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")]
 #[inline]
+#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
 pub const unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: usize) {
     extern "rust-intrinsic" {
         #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")]
@@ -2535,6 +2536,7 @@ pub const unsafe fn copy_nonoverlapping<T>(src: *const T, dst: *mut T, count: us
 #[cfg_attr(not(bootstrap), rustc_allowed_through_unstable_modules)]
 #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")]
 #[inline]
+#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
 pub const unsafe fn copy<T>(src: *const T, dst: *mut T, count: usize) {
     extern "rust-intrinsic" {
         #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")]

library/core/src/mem/mod.rs

@@ -1124,6 +1124,7 @@ impl<T> fmt::Debug for Discriminant<T> {
 #[stable(feature = "discriminant_value", since = "1.21.0")]
 #[rustc_const_unstable(feature = "const_discriminant", issue = "69821")]
 #[cfg_attr(not(test), rustc_diagnostic_item = "mem_discriminant")]
+#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
 pub const fn discriminant<T>(v: &T) -> Discriminant<T> {
     Discriminant(intrinsics::discriminant_value(v))
 }

library/core/src/num/int_macros.rs

@@ -449,6 +449,7 @@ macro_rules! int_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_add(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_add`.
@@ -517,6 +518,7 @@ macro_rules! int_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_sub(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_sub`.
@@ -585,6 +587,7 @@ macro_rules! int_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_mul(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_mul`.
@@ -757,6 +760,7 @@ macro_rules! int_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_shl(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shl`.
@@ -803,6 +807,7 @@ macro_rules! int_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_shr(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shr`.

library/core/src/num/uint_macros.rs

@@ -459,6 +459,7 @@ macro_rules! uint_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_add(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_add`.
@@ -528,6 +529,7 @@ macro_rules! uint_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_sub(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_sub`.
@@ -574,6 +576,7 @@ macro_rules! uint_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_mul(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_mul`.
@@ -933,6 +936,7 @@ macro_rules! uint_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_shl(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shl`.
@@ -979,6 +983,7 @@ macro_rules! uint_impl {
                       without modifying the original"]
         #[rustc_const_unstable(feature = "const_inherent_unchecked_arith", issue = "85122")]
         #[inline(always)]
+        #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
         pub const unsafe fn unchecked_shr(self, rhs: Self) -> Self {
             // SAFETY: the caller must uphold the safety contract for
             // `unchecked_shr`.

library/core/src/ptr/const_ptr.rs

@@ -449,6 +449,7 @@ impl<T: ?Sized> *const T {
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
     #[inline(always)]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn offset(self, count: isize) -> *const T
     where
         T: Sized,
@@ -471,6 +472,7 @@ impl<T: ?Sized> *const T {
     #[inline(always)]
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_offset(self, count: isize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `offset`.
         let this = unsafe { self.cast::<u8>().offset(count).cast::<()>() };
@@ -641,6 +643,7 @@ impl<T: ?Sized> *const T {
     #[stable(feature = "ptr_offset_from", since = "1.47.0")]
     #[rustc_const_unstable(feature = "const_ptr_offset_from", issue = "92980")]
     #[inline]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn offset_from(self, origin: *const T) -> isize
     where
         T: Sized,
@@ -663,6 +666,7 @@ impl<T: ?Sized> *const T {
     #[inline(always)]
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_offset_from(self, origin: *const T) -> isize {
         // SAFETY: the caller must uphold the safety contract for `offset_from`.
         unsafe { self.cast::<u8>().offset_from(origin.cast::<u8>()) }
@@ -731,6 +735,7 @@ impl<T: ?Sized> *const T {
     #[unstable(feature = "ptr_sub_ptr", issue = "95892")]
     #[rustc_const_unstable(feature = "const_ptr_sub_ptr", issue = "95892")]
     #[inline]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn sub_ptr(self, origin: *const T) -> usize
     where
         T: Sized,
@@ -862,6 +867,7 @@ impl<T: ?Sized> *const T {
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
     #[inline(always)]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn add(self, count: usize) -> Self
     where
         T: Sized,
@@ -884,6 +890,7 @@ impl<T: ?Sized> *const T {
     #[inline(always)]
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_add(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `add`.
         let this = unsafe { self.cast::<u8>().add(count).cast::<()>() };
@@ -946,6 +953,7 @@ impl<T: ?Sized> *const T {
     #[must_use = "returns a new pointer rather than modifying its argument"]
     #[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
     #[inline]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn sub(self, count: usize) -> Self
     where
         T: Sized,
@@ -969,6 +977,7 @@ impl<T: ?Sized> *const T {
     #[inline(always)]
     #[unstable(feature = "pointer_byte_offsets", issue = "96283")]
     #[rustc_const_unstable(feature = "const_pointer_byte_offsets", issue = "96283")]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn byte_sub(self, count: usize) -> Self {
         // SAFETY: the caller must uphold the safety contract for `sub`.
         let this = unsafe { self.cast::<u8>().sub(count).cast::<()>() };
@@ -1205,6 +1214,7 @@ impl<T: ?Sized> *const T {
     #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn copy_to(self, dest: *mut T, count: usize)
     where
         T: Sized,
@@ -1224,6 +1234,7 @@ impl<T: ?Sized> *const T {
     #[rustc_const_stable(feature = "const_intrinsic_copy", since = "1.63.0")]
     #[stable(feature = "pointer_methods", since = "1.26.0")]
     #[inline]
+    #[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
     pub const unsafe fn copy_to_nonoverlapping(self, dest: *mut T, count: usize)
     where
         T: Sized,