Auto merge of #95125 - JakobDegen:uninit-variant-rvalue, r=oli-obk

Add new `Deinit` statement

This rvalue replaces `SetDiscriminant` for ADTs. This PR is an alternative to #94590 , which only specifies that the behavior of `SetDiscriminant` is the same as what this rvalue would do. The motivation for this change are discussed in that PR and [on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/189540-t-compiler.2Fwg-mir-opt/topic/SetDiscriminant.20and.20aggregate.20initialization.20.2394590)

r? `@oli-obk`

Author: bors

compiler/rustc_borrowck/src/dataflow.rs

@@ -386,6 +386,7 @@ impl<'tcx> rustc_mir_dataflow::GenKillAnalysis<'tcx> for Borrows<'_, 'tcx> {
 
             mir::StatementKind::FakeRead(..)
             | mir::StatementKind::SetDiscriminant { .. }
+            | mir::StatementKind::Deinit(..)
             | mir::StatementKind::StorageLive(..)
             | mir::StatementKind::Retag { .. }
             | mir::StatementKind::AscribeUserType(..)

compiler/rustc_borrowck/src/def_use.rs

@@ -72,5 +72,9 @@ pub fn categorize(context: PlaceContext) -> Option<DefUse> {
 
         // Debug info is neither def nor use.
         PlaceContext::NonUse(NonUseContext::VarDebugInfo) => None,
+
+        PlaceContext::MutatingUse(MutatingUseContext::Deinit | MutatingUseContext::SetDiscriminant) => {
+            bug!("These statements are not allowed in this MIR phase")
+        }
     }
 }

compiler/rustc_borrowck/src/invalidation.rs

@@ -63,9 +63,6 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
             StatementKind::FakeRead(box (_, _)) => {
                 // Only relevant for initialized/liveness/safety checks.
             }
-            StatementKind::SetDiscriminant { place, variant_index: _ } => {
-                self.mutate_place(location, **place, Shallow(None));
-            }
             StatementKind::CopyNonOverlapping(box rustc_middle::mir::CopyNonOverlapping {
                 ref src,
                 ref dst,
@@ -91,6 +88,9 @@ impl<'cx, 'tcx> Visitor<'tcx> for InvalidationGenerator<'cx, 'tcx> {
                     LocalMutationIsAllowed::Yes,
                 );
             }
+            StatementKind::Deinit(..) | StatementKind::SetDiscriminant { .. } => {
+                bug!("Statement not allowed in this MIR phase")
+            }
         }
 
         self.super_statement(statement, location);

compiler/rustc_borrowck/src/lib.rs

@@ -626,9 +626,6 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
                     flow_state,
                 );
             }
-            StatementKind::SetDiscriminant { place, variant_index: _ } => {
-                self.mutate_place(location, (**place, span), Shallow(None), flow_state);
-            }
             StatementKind::CopyNonOverlapping(box rustc_middle::mir::CopyNonOverlapping {
                 ..
             }) => {
@@ -654,6 +651,9 @@ impl<'cx, 'tcx> rustc_mir_dataflow::ResultsVisitor<'cx, 'tcx> for MirBorrowckCtx
                     flow_state,
                 );
             }
+            StatementKind::Deinit(..) | StatementKind::SetDiscriminant { .. } => {
+                bug!("Statement not allowed in this MIR phase")
+            }
         }
     }
 

compiler/rustc_borrowck/src/type_check/mod.rs

@@ -1303,28 +1303,6 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
                     );
                 }
             }
-            StatementKind::SetDiscriminant { ref place, variant_index } => {
-                let place_type = place.ty(body, tcx).ty;
-                let adt = match place_type.kind() {
-                    ty::Adt(adt, _) if adt.is_enum() => adt,
-                    _ => {
-                        span_bug!(
-                            stmt.source_info.span,
-                            "bad set discriminant ({:?} = {:?}): lhs is not an enum",
-                            place,
-                            variant_index
-                        );
-                    }
-                };
-                if variant_index.as_usize() >= adt.variants().len() {
-                    span_bug!(
-                        stmt.source_info.span,
-                        "bad set discriminant ({:?} = {:?}): value of of range",
-                        place,
-                        variant_index
-                    );
-                };
-            }
             StatementKind::AscribeUserType(box (ref place, ref projection), variance) => {
                 let place_ty = place.ty(body, tcx).ty;
                 if let Err(terr) = self.relate_type_and_user_type(
@@ -1358,6 +1336,9 @@ impl<'a, 'tcx> TypeChecker<'a, 'tcx> {
             | StatementKind::Retag { .. }
             | StatementKind::Coverage(..)
             | StatementKind::Nop => {}
+            StatementKind::Deinit(..) | StatementKind::SetDiscriminant { .. } => {
+                bug!("Statement not allowed in this MIR phase")
+            }
         }
     }
 

compiler/rustc_codegen_cranelift/src/base.rs

@@ -772,6 +772,7 @@ fn codegen_stmt<'tcx>(
         }
         StatementKind::StorageLive(_)
         | StatementKind::StorageDead(_)
+        | StatementKind::Deinit(_)
         | StatementKind::Nop
         | StatementKind::FakeRead(..)
         | StatementKind::Retag { .. }

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -518,6 +518,7 @@ pub(crate) fn mir_operand_get_const_val<'tcx>(
                         StatementKind::Assign(_)
                         | StatementKind::FakeRead(_)
                         | StatementKind::SetDiscriminant { .. }
+                        | StatementKind::Deinit(_)
                         | StatementKind::StorageLive(_)
                         | StatementKind::StorageDead(_)
                         | StatementKind::Retag(_, _)

compiler/rustc_codegen_ssa/src/mir/analyze.rs

@@ -211,6 +211,8 @@ impl<'mir, 'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> Visitor<'tcx>
 
             PlaceContext::MutatingUse(
                 MutatingUseContext::Store
+                | MutatingUseContext::Deinit
+                | MutatingUseContext::SetDiscriminant
                 | MutatingUseContext::AsmOutput
                 | MutatingUseContext::Borrow
                 | MutatingUseContext::AddressOf

compiler/rustc_codegen_ssa/src/mir/statement.rs

@@ -48,6 +48,12 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
                     .codegen_set_discr(&mut bx, variant_index);
                 bx
             }
+            mir::StatementKind::Deinit(..) => {
+                // For now, don't codegen this to anything. In the future it may be worth
+                // experimenting with what kind of information we can emit to LLVM without hurting
+                // perf here
+                bx
+            }
             mir::StatementKind::StorageLive(local) => {
                 if let LocalRef::Place(cg_place) = self.locals[local] {
                     cg_place.storage_live(&mut bx);

compiler/rustc_const_eval/src/interpret/memory.rs

@@ -890,6 +890,11 @@ impl<'tcx, 'a, Tag: Provenance, Extra> AllocRefMut<'a, 'tcx, Tag, Extra> {
     ) -> InterpResult<'tcx> {
         self.write_scalar(alloc_range(offset, self.tcx.data_layout().pointer_size), val)
     }
+
+    /// Mark the entire referenced range as uninitalized
+    pub fn write_uninit(&mut self) {
+        self.alloc.mark_init(self.range, false);
+    }
 }
 
 impl<'tcx, 'a, Tag: Provenance, Extra> AllocRef<'a, 'tcx, Tag, Extra> {