diff options
Diffstat (limited to 'compiler/rustc_const_eval/src/interpret/machine.rs')
| -rw-r--r-- | compiler/rustc_const_eval/src/interpret/machine.rs | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/compiler/rustc_const_eval/src/interpret/machine.rs b/compiler/rustc_const_eval/src/interpret/machine.rs index b981a1ee2ca..0106ec425bc 100644 --- a/compiler/rustc_const_eval/src/interpret/machine.rs +++ b/compiler/rustc_const_eval/src/interpret/machine.rs @@ -388,6 +388,8 @@ pub trait Machine<'mir, 'tcx: 'mir>: Sized { /// Takes read-only access to the allocation so we can keep all the memory read /// operations take `&self`. Use a `RefCell` in `AllocExtra` if you /// need to mutate. + /// + /// This is not invoked for ZST accesses, as no read actually happens. #[inline(always)] fn before_memory_read( _tcx: TyCtxtAt<'tcx>, @@ -399,7 +401,20 @@ pub trait Machine<'mir, 'tcx: 'mir>: Sized { Ok(()) } + /// Hook for performing extra checks on any memory read access, + /// that involves an allocation, even ZST reads. + /// + /// Used to prevent statics from self-initializing by reading from their own memory + /// as it is being initialized. + fn before_alloc_read( + _ecx: &InterpCx<'mir, 'tcx, Self>, + _alloc_id: AllocId, + ) -> InterpResult<'tcx> { + Ok(()) + } + /// Hook for performing extra checks on a memory write access. + /// This is not invoked for ZST accesses, as no write actually happens. #[inline(always)] fn before_memory_write( _tcx: TyCtxtAt<'tcx>, |