Rollup merge of #90102 - nbdd0121:box3, r=jonas-schievink

Remove `NullOp::Box`

Follow up of #89030 and MCP rust-lang/compiler-team#460.

~1 month later nothing seems to be broken, apart from a small regression that #89332 (1aac85bb716c09304b313d69d30d74fe7e8e1a8e) shows could be regained by remvoing the diverging path, so it shall be safe to continue and remove `NullOp::Box` completely.

r? `@jonas-schievink`
`@rustbot` label T-compiler

compiler/rustc_const_eval/src/const_eval/machine.rs

@@ -398,13 +398,6 @@ impl<'mir, 'tcx> interpret::Machine<'mir, 'tcx> for CompileTimeInterpreter<'mir,
         Err(ConstEvalErrKind::NeedsRfc("pointer arithmetic or comparison".to_string()).into())
     }
 
-    fn box_alloc(
-        _ecx: &mut InterpCx<'mir, 'tcx, Self>,
-        _dest: &PlaceTy<'tcx>,
-    ) -> InterpResult<'tcx> {
-        Err(ConstEvalErrKind::NeedsRfc("heap allocations via `box` keyword".to_string()).into())
-    }
-
     fn before_terminator(ecx: &mut InterpCx<'mir, 'tcx, Self>) -> InterpResult<'tcx> {
         // The step limit has already been hit in a previous call to `before_terminator`.
         if ecx.machine.steps_remaining == 0 {

compiler/rustc_const_eval/src/interpret/eval_context.rs

@@ -156,7 +156,7 @@ pub enum StackPopCleanup {
     /// `ret` stores the block we jump to on a normal return, while `unwind`
     /// stores the block used for cleanup during unwinding.
     Goto { ret: Option<mir::BasicBlock>, unwind: StackPopUnwind },
-    /// Just do nothing: Used by Main and for the `box_alloc` hook in miri.
+    /// Just do nothing: Used by Main and for TLS hooks in miri.
     /// `cleanup` says whether locals are deallocated. Static computation
     /// wants them leaked to intern what they need (and just throw away
     /// the entire `ecx` when it is done).

compiler/rustc_const_eval/src/interpret/machine.rs

@@ -212,12 +212,6 @@ pub trait Machine<'mir, 'tcx>: Sized {
         right: &ImmTy<'tcx, Self::PointerTag>,
     ) -> InterpResult<'tcx, (Scalar<Self::PointerTag>, bool, Ty<'tcx>)>;
 
-    /// Heap allocations via the `box` keyword.
-    fn box_alloc(
-        ecx: &mut InterpCx<'mir, 'tcx, Self>,
-        dest: &PlaceTy<'tcx, Self::PointerTag>,
-    ) -> InterpResult<'tcx>;
-
     /// Called to read the specified `local` from the `frame`.
     /// Since reading a ZST is not actually accessing memory or locals, this is never invoked
     /// for ZST reads.

compiler/rustc_const_eval/src/interpret/step.rs

@@ -271,10 +271,6 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 self.write_immediate(place.to_ref(self), &dest)?;
             }
 
-            NullaryOp(mir::NullOp::Box, _) => {
-                M::box_alloc(self, &dest)?;
-            }
-
             NullaryOp(null_op, ty) => {
                 let ty = self.subst_from_current_frame_and_normalize_erasing_regions(ty)?;
                 let layout = self.layout_of(ty)?;
@@ -289,7 +285,6 @@ impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> InterpCx<'mir, 'tcx, M> {
                 let val = match null_op {
                     mir::NullOp::SizeOf => layout.size.bytes(),
                     mir::NullOp::AlignOf => layout.align.abi.bytes(),
-                    mir::NullOp::Box => unreachable!(),
                 };
                 self.write_scalar(Scalar::from_machine_usize(val, self), &dest)?;
             }

compiler/rustc_const_eval/src/transform/check_consts/check.rs

@@ -632,7 +632,6 @@ impl<'tcx> Visitor<'tcx> for Checker<'_, 'tcx> {
             }
 
             Rvalue::NullaryOp(NullOp::SizeOf | NullOp::AlignOf, _) => {}
-            Rvalue::NullaryOp(NullOp::Box, _) => self.check_op(ops::HeapAllocation),
             Rvalue::ShallowInitBox(_, _) => {}
 
             Rvalue::UnaryOp(_, ref operand) => {

compiler/rustc_const_eval/src/transform/promote_consts.rs

@@ -508,7 +508,6 @@ impl<'tcx> Validator<'_, 'tcx> {
             }
 
             Rvalue::NullaryOp(op, _) => match op {
-                NullOp::Box => return Err(Unpromotable),
                 NullOp::SizeOf => {}
                 NullOp::AlignOf => {}
             },