Auto merge of rust-lang#127777 - matthiaskrgr:rollup-qp2vkan, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - rust-lang#124921 (offset_from: always allow pointers to point to the same address)
 - rust-lang#127407 (Make parse error suggestions verbose and fix spans)
 - rust-lang#127684 (consolidate miri-unleashed tests for mutable refs into one file)
 - rust-lang#127729 (Stop using the `gen` identifier in the compiler)
 - rust-lang#127736 (Add myself to the review rotation)
 - rust-lang#127758 (coverage: Restrict `ExpressionUsed` simplification to `Code` mappings)

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

Author: bors

Diff for: compiler/rustc_borrowck/src/dataflow.rs

@@ -553,7 +553,7 @@ impl<'tcx> rustc_mir_dataflow::GenKillAnalysis<'tcx> for Borrows<'_, '_, 'tcx> {
                         panic!("could not find BorrowIndex for location {location:?}");
                     });
 
-                    trans.gen(index);
+                    trans.gen_(index);
                 }
 
                 // Make sure there are no remaining borrows for variables

Diff for: compiler/rustc_codegen_llvm/src/coverageinfo/map_data.rs

@@ -66,8 +66,15 @@ impl<'tcx> FunctionCoverageCollector<'tcx> {
         // For each expression ID that is directly used by one or more mappings,
         // mark it as not-yet-seen. This indicates that we expect to see a
         // corresponding `ExpressionUsed` statement during MIR traversal.
-        for term in function_coverage_info.mappings.iter().flat_map(|m| m.kind.terms()) {
-            if let CovTerm::Expression(id) = term {
+        for mapping in function_coverage_info.mappings.iter() {
+            // Currently we only worry about ordinary code mappings.
+            // For branch and MC/DC mappings, expressions might not correspond
+            // to any particular point in the control-flow graph.
+            // (Keep this in sync with the injection of `ExpressionUsed`
+            // statements in the `InstrumentCoverage` MIR pass.)
+            if let MappingKind::Code(term) = mapping.kind
+                && let CovTerm::Expression(id) = term
+            {
                 expressions_seen.remove(id);
             }
         }

Diff for: compiler/rustc_const_eval/src/interpret/intrinsics.rs

@@ -20,7 +20,7 @@ use super::{
     err_inval, err_ub_custom, err_unsup_format, memory::MemoryKind, throw_inval, throw_ub_custom,
     throw_ub_format, util::ensure_monomorphic_enough, Allocation, CheckInAllocMsg, ConstAllocation,
     GlobalId, ImmTy, InterpCx, InterpResult, MPlaceTy, Machine, OpTy, Pointer, PointerArithmetic,
-    Scalar,
+    Provenance, Scalar,
 };
 
 use crate::fluent_generated as fluent;
@@ -259,25 +259,28 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
                             // This will always return 0.
                             (a, b)
                         }
-                        (Err(_), _) | (_, Err(_)) => {
-                            // We managed to find a valid allocation for one pointer, but not the other.
-                            // That means they are definitely not pointing to the same allocation.
+                        _ if M::Provenance::OFFSET_IS_ADDR && a.addr() == b.addr() => {
+                            // At least one of the pointers has provenance, but they also point to
+                            // the same address so it doesn't matter; this is fine. `(0, 0)` means
+                            // we pass all the checks below and return 0.
+                            (0, 0)
+                        }
+                        // From here onwards, the pointers are definitely for different addresses
+                        // (or we can't determine their absolute address).
+                        (Ok((a_alloc_id, a_offset, _)), Ok((b_alloc_id, b_offset, _)))
+                            if a_alloc_id == b_alloc_id =>
+                        {
+                            // Found allocation for both, and it's the same.
+                            // Use these offsets for distance calculation.
+                            (a_offset.bytes(), b_offset.bytes())
+                        }
+                        _ => {
+                            // Not into the same allocation -- this is UB.
                             throw_ub_custom!(
                                 fluent::const_eval_offset_from_different_allocations,
                                 name = intrinsic_name,
                             );
                         }
-                        (Ok((a_alloc_id, a_offset, _)), Ok((b_alloc_id, b_offset, _))) => {
-                            // Found allocation for both. They must be into the same allocation.
-                            if a_alloc_id != b_alloc_id {
-                                throw_ub_custom!(
-                                    fluent::const_eval_offset_from_different_allocations,
-                                    name = intrinsic_name,
-                                );
-                            }
-                            // Use these offsets for distance calculation.
-                            (a_offset.bytes(), b_offset.bytes())
-                        }
                     };
 
                 // Compute distance.

Diff for: compiler/rustc_hir/src/hir.rs

@@ -3218,10 +3218,10 @@ impl<'hir> Item<'hir> {
             ItemKind::Static(ty, mutbl, body), (ty, *mutbl, *body);
 
         expect_const, (&'hir Ty<'hir>, &'hir Generics<'hir>, BodyId),
-            ItemKind::Const(ty, gen, body), (ty, gen, *body);
+            ItemKind::Const(ty, generics, body), (ty, generics, *body);
 
         expect_fn, (&FnSig<'hir>, &'hir Generics<'hir>, BodyId),
-            ItemKind::Fn(sig, gen, body), (sig, gen, *body);
+            ItemKind::Fn(sig, generics, body), (sig, generics, *body);
 
         expect_macro, (&ast::MacroDef, MacroKind), ItemKind::Macro(def, mk), (def, *mk);
 
@@ -3233,25 +3233,25 @@ impl<'hir> Item<'hir> {
         expect_global_asm, &'hir InlineAsm<'hir>, ItemKind::GlobalAsm(asm), asm;
 
         expect_ty_alias, (&'hir Ty<'hir>, &'hir Generics<'hir>),
-            ItemKind::TyAlias(ty, gen), (ty, gen);
+            ItemKind::TyAlias(ty, generics), (ty, generics);
 
         expect_opaque_ty, &OpaqueTy<'hir>, ItemKind::OpaqueTy(ty), ty;
 
-        expect_enum, (&EnumDef<'hir>, &'hir Generics<'hir>), ItemKind::Enum(def, gen), (def, gen);
+        expect_enum, (&EnumDef<'hir>, &'hir Generics<'hir>), ItemKind::Enum(def, generics), (def, generics);
 
         expect_struct, (&VariantData<'hir>, &'hir Generics<'hir>),
-            ItemKind::Struct(data, gen), (data, gen);
+            ItemKind::Struct(data, generics), (data, generics);
 
         expect_union, (&VariantData<'hir>, &'hir Generics<'hir>),
-            ItemKind::Union(data, gen), (data, gen);
+            ItemKind::Union(data, generics), (data, generics);
 
         expect_trait,
             (IsAuto, Safety, &'hir Generics<'hir>, GenericBounds<'hir>, &'hir [TraitItemRef]),
-            ItemKind::Trait(is_auto, safety, gen, bounds, items),
-            (*is_auto, *safety, gen, bounds, items);
+            ItemKind::Trait(is_auto, safety, generics, bounds, items),
+            (*is_auto, *safety, generics, bounds, items);
 
         expect_trait_alias, (&'hir Generics<'hir>, GenericBounds<'hir>),
-            ItemKind::TraitAlias(gen, bounds), (gen, bounds);
+            ItemKind::TraitAlias(generics, bounds), (generics, bounds);
 
         expect_impl, &'hir Impl<'hir>, ItemKind::Impl(imp), imp;
     }

Diff for: compiler/rustc_hir_typeck/src/fn_ctxt/checks.rs

@@ -2554,7 +2554,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         .and_then(|node| node.generics())
                         .into_iter()
                         .flat_map(|generics| generics.params)
-                        .find(|gen| &gen.def_id.to_def_id() == res_def_id)
+                        .find(|param| &param.def_id.to_def_id() == res_def_id)
                 } else {
                     None
                 }

Diff for: compiler/rustc_macros/src/diagnostics/diagnostic.rs

@@ -71,6 +71,8 @@ impl<'a> DiagnosticDerive<'a> {
         });
 
         // A lifetime of `'a` causes conflicts, but `_sess` is fine.
+        // FIXME(edition_2024): Fix the `keyword_idents_2024` lint to not trigger here?
+        #[allow(keyword_idents_2024)]
         let mut imp = structure.gen_impl(quote! {
             gen impl<'_sess, G> rustc_errors::Diagnostic<'_sess, G> for @Self
                 where G: rustc_errors::EmissionGuarantee
@@ -148,6 +150,8 @@ impl<'a> LintDiagnosticDerive<'a> {
             }
         });
 
+        // FIXME(edition_2024): Fix the `keyword_idents_2024` lint to not trigger here?
+        #[allow(keyword_idents_2024)]
         let mut imp = structure.gen_impl(quote! {
             gen impl<'__a> rustc_errors::LintDiagnostic<'__a, ()> for @Self {
                 #[track_caller]

Diff for: compiler/rustc_macros/src/diagnostics/subdiagnostic.rs

@@ -86,6 +86,9 @@ impl SubdiagnosticDerive {
 
         let diag = &self.diag;
         let f = &self.f;
+
+        // FIXME(edition_2024): Fix the `keyword_idents_2024` lint to not trigger here?
+        #[allow(keyword_idents_2024)]
         let ret = structure.gen_impl(quote! {
             gen impl rustc_errors::Subdiagnostic for @Self {
                 fn add_to_diag_with<__G, __F>(
@@ -100,6 +103,7 @@ impl SubdiagnosticDerive {
                 }
             }
         });
+
         ret
     }
 }

Diff for: compiler/rustc_middle/src/mir/coverage.rs

@@ -220,19 +220,6 @@ pub enum MappingKind {
 }
 
 impl MappingKind {
-    /// Iterator over all coverage terms in this mapping kind.
-    pub fn terms(&self) -> impl Iterator<Item = CovTerm> {
-        let zero = || None.into_iter().chain(None);
-        let one = |a| Some(a).into_iter().chain(None);
-        let two = |a, b| Some(a).into_iter().chain(Some(b));
-        match *self {
-            Self::Code(term) => one(term),
-            Self::Branch { true_term, false_term } => two(true_term, false_term),
-            Self::MCDCBranch { true_term, false_term, .. } => two(true_term, false_term),
-            Self::MCDCDecision(_) => zero(),
-        }
-    }
-
     /// Returns a copy of this mapping kind, in which all coverage terms have
     /// been replaced with ones returned by the given function.
     pub fn map_terms(&self, map_fn: impl Fn(CovTerm) -> CovTerm) -> Self {

Diff for: compiler/rustc_middle/src/mir/visit.rs

@@ -1016,14 +1016,14 @@ macro_rules! extra_body_methods {
 macro_rules! super_body {
     ($self:ident, $body:ident, $($mutability:ident, $invalidate:tt)?) => {
         let span = $body.span;
-        if let Some(gen) = &$($mutability)? $body.coroutine {
-            if let Some(yield_ty) = $(& $mutability)? gen.yield_ty {
+        if let Some(coroutine) = &$($mutability)? $body.coroutine {
+            if let Some(yield_ty) = $(& $mutability)? coroutine.yield_ty {
                 $self.visit_ty(
                     yield_ty,
                     TyContext::YieldTy(SourceInfo::outermost(span))
                 );
             }
-            if let Some(resume_ty) = $(& $mutability)? gen.resume_ty {
+            if let Some(resume_ty) = $(& $mutability)? coroutine.resume_ty {
                 $self.visit_ty(
                     resume_ty,
                     TyContext::ResumeTy(SourceInfo::outermost(span))

Diff for: compiler/rustc_mir_dataflow/src/framework/mod.rs

@@ -402,15 +402,15 @@ where
 /// building up a `GenKillSet` and then throwing it away.
 pub trait GenKill<T> {
     /// Inserts `elem` into the state vector.
-    fn gen(&mut self, elem: T);
+    fn gen_(&mut self, elem: T);
 
     /// Removes `elem` from the state vector.
     fn kill(&mut self, elem: T);
 
     /// Calls `gen` for each element in `elems`.
     fn gen_all(&mut self, elems: impl IntoIterator<Item = T>) {
         for elem in elems {
-            self.gen(elem);
+            self.gen_(elem);
         }
     }
 
@@ -424,44 +424,44 @@ pub trait GenKill<T> {
 
 /// Stores a transfer function for a gen/kill problem.
 ///
-/// Calling `gen`/`kill` on a `GenKillSet` will "build up" a transfer function so that it can be
-/// applied multiple times efficiently. When there are multiple calls to `gen` and/or `kill` for
+/// Calling `gen_`/`kill` on a `GenKillSet` will "build up" a transfer function so that it can be
+/// applied multiple times efficiently. When there are multiple calls to `gen_` and/or `kill` for
 /// the same element, the most recent one takes precedence.
 #[derive(Clone)]
 pub struct GenKillSet<T> {
-    gen: HybridBitSet<T>,
+    gen_: HybridBitSet<T>,
     kill: HybridBitSet<T>,
 }
 
 impl<T: Idx> GenKillSet<T> {
     /// Creates a new transfer function that will leave the dataflow state unchanged.
     pub fn identity(universe: usize) -> Self {
         GenKillSet {
-            gen: HybridBitSet::new_empty(universe),
+            gen_: HybridBitSet::new_empty(universe),
             kill: HybridBitSet::new_empty(universe),
         }
     }
 
     pub fn apply(&self, state: &mut impl BitSetExt<T>) {
-        state.union(&self.gen);
+        state.union(&self.gen_);
         state.subtract(&self.kill);
     }
 }
 
 impl<T: Idx> GenKill<T> for GenKillSet<T> {
-    fn gen(&mut self, elem: T) {
-        self.gen.insert(elem);
+    fn gen_(&mut self, elem: T) {
+        self.gen_.insert(elem);
         self.kill.remove(elem);
     }
 
     fn kill(&mut self, elem: T) {
         self.kill.insert(elem);
-        self.gen.remove(elem);
+        self.gen_.remove(elem);
     }
 }
 
 impl<T: Idx> GenKill<T> for BitSet<T> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         self.insert(elem);
     }
 
@@ -471,7 +471,7 @@ impl<T: Idx> GenKill<T> for BitSet<T> {
 }
 
 impl<T: Idx> GenKill<T> for ChunkedBitSet<T> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         self.insert(elem);
     }
 
@@ -481,11 +481,11 @@ impl<T: Idx> GenKill<T> for ChunkedBitSet<T> {
 }
 
 impl<T, S: GenKill<T>> GenKill<T> for MaybeReachable<S> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         match self {
             // If the state is not reachable, adding an element does nothing.
             MaybeReachable::Unreachable => {}
-            MaybeReachable::Reachable(set) => set.gen(elem),
+            MaybeReachable::Reachable(set) => set.gen_(elem),
         }
     }
 
@@ -499,7 +499,7 @@ impl<T, S: GenKill<T>> GenKill<T> for MaybeReachable<S> {
 }
 
 impl<T: Idx> GenKill<T> for lattice::Dual<BitSet<T>> {
-    fn gen(&mut self, elem: T) {
+    fn gen_(&mut self, elem: T) {
         self.0.insert(elem);
     }
 

Diff for: compiler/rustc_mir_dataflow/src/impls/borrowed_locals.rs

@@ -97,7 +97,7 @@ where
             Rvalue::AddressOf(_, borrowed_place)
             | Rvalue::Ref(_, BorrowKind::Mut { .. } | BorrowKind::Shared, borrowed_place) => {
                 if !borrowed_place.is_indirect() {
-                    self.trans.gen(borrowed_place.local);
+                    self.trans.gen_(borrowed_place.local);
                 }
             }
 
@@ -131,7 +131,7 @@ where
                 //
                 // [#61069]: https://github.com/rust-lang/rust/pull/61069
                 if !dropped_place.is_indirect() {
-                    self.trans.gen(dropped_place.local);
+                    self.trans.gen_(dropped_place.local);
                 }
             }
 
@@ -159,8 +159,8 @@ pub fn borrowed_locals(body: &Body<'_>) -> BitSet<Local> {
 
     impl GenKill<Local> for Borrowed {
         #[inline]
-        fn gen(&mut self, elem: Local) {
-            self.0.gen(elem)
+        fn gen_(&mut self, elem: Local) {
+            self.0.gen_(elem)
         }
         #[inline]
         fn kill(&mut self, _: Local) {