Struct rustc_const_eval::interpret::place::MPlaceTy

pub struct MPlaceTy<'tcx, Prov: Provenance = AllocId> {
    mplace: MemPlace<Prov>,
    pub layout: TyAndLayout<'tcx>,
    pub align: Align,
}

A MemPlace with its layout. Constructing it is only possible in this module.

Fields

mplace: MemPlace<Prov>

layout: TyAndLayout<'tcx>

align: Align

rustc does not have a proper way to represent the type of a field of a repr(packed) struct: it needs to have a different alignment than the field type would usually have. So we represent this here with a separate field that “overwrites” layout.align. This means layout.align should never be used for a MPlaceTy!

Implementations

impl<'tcx, Prov: Provenance> MPlaceTy<'tcx, Prov>

pub fn fake_alloc_zst(layout: TyAndLayout<'tcx>) -> Self

Produces a MemPlace that works for ZST but nothing else. Conceptually this is a new allocation, but it doesn’t actually create an allocation so you don’t need to worry about memory leaks.

pub(crate) fn offset_with_meta( &self, offset: Size, meta: MemPlaceMeta<Prov>, layout: TyAndLayout<'tcx>, cx: &impl HasDataLayout ) -> InterpResult<'tcx, Self>

Offset the place in memory and change its metadata.

This can go wrong very easily if you give the wrong layout for the new place!

pub fn offset( &self, offset: Size, layout: TyAndLayout<'tcx>, cx: &impl HasDataLayout ) -> InterpResult<'tcx, Self>

Offset the place in memory.

This can go wrong very easily if you give the wrong layout for the new place!

pub fn from_aligned_ptr( ptr: Pointer<Option<Prov>>, layout: TyAndLayout<'tcx> ) -> Self

pub fn from_aligned_ptr_with_meta( ptr: Pointer<Option<Prov>>, layout: TyAndLayout<'tcx>, meta: MemPlaceMeta<Prov> ) -> Self

pub(crate) fn len(&self, cx: &impl HasDataLayout) -> InterpResult<'tcx, u64>

Trait Implementations

impl<'tcx, Prov: Clone + Provenance> Clone for MPlaceTy<'tcx, Prov>

fn clone(&self) -> MPlaceTy<'tcx, Prov>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'tcx, Prov: Debug + Provenance> Debug for MPlaceTy<'tcx, Prov>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'tcx, Prov: Provenance> Deref for MPlaceTy<'tcx, Prov>

type Target = MemPlace<Prov>

The resulting type after dereferencing.

fn deref(&self) -> &MemPlace<Prov>

Dereferences the value.

impl<'tcx, Prov: Provenance> From<&MPlaceTy<'tcx, Prov>> for OpTy<'tcx, Prov>

fn from(mplace: &MPlaceTy<'tcx, Prov>) -> Self

Converts to this type from the input type.

impl<'tcx, Prov: Provenance> From<&MPlaceTy<'tcx, Prov>> for PlaceTy<'tcx, Prov>

fn from(mplace: &MPlaceTy<'tcx, Prov>) -> Self

Converts to this type from the input type.

impl<'tcx, Prov: Provenance> From<&mut MPlaceTy<'tcx, Prov>> for OpTy<'tcx, Prov>

fn from(mplace: &mut MPlaceTy<'tcx, Prov>) -> Self

Converts to this type from the input type.

impl<'tcx, Prov: Provenance> From<&mut MPlaceTy<'tcx, Prov>> for PlaceTy<'tcx, Prov>

fn from(mplace: &mut MPlaceTy<'tcx, Prov>) -> Self

Converts to this type from the input type.

impl<'tcx, Prov: Provenance> From<MPlaceTy<'tcx, Prov>> for OpTy<'tcx, Prov>

fn from(mplace: MPlaceTy<'tcx, Prov>) -> Self

Converts to this type from the input type.

impl<'tcx, Prov: Provenance> From<MPlaceTy<'tcx, Prov>> for PlaceTy<'tcx, Prov>

fn from(mplace: MPlaceTy<'tcx, Prov>) -> Self

Converts to this type from the input type.

impl<'tcx, Prov: Hash + Provenance> Hash for MPlaceTy<'tcx, Prov>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<'tcx, Prov: PartialEq + Provenance> PartialEq<MPlaceTy<'tcx, Prov>> for MPlaceTy<'tcx, Prov>

fn eq(&self, other: &MPlaceTy<'tcx, Prov>) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> Value<'mir, 'tcx, M> for MPlaceTy<'tcx, M::Provenance>

fn layout(&self) -> TyAndLayout<'tcx>

Gets this value’s layout.

fn to_op_for_read( &self, _ecx: &InterpCx<'mir, 'tcx, M> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Makes this into an OpTy, in a cheap way that is good for reading.

fn from_op(op: &OpTy<'tcx, M::Provenance>) -> Self

Creates this from an OpTy.

fn project_downcast( &self, ecx: &InterpCx<'mir, 'tcx, M>, variant: VariantIdx ) -> InterpResult<'tcx, Self>

Projects to the given enum variant.

fn project_field( &self, ecx: &InterpCx<'mir, 'tcx, M>, field: usize ) -> InterpResult<'tcx, Self>

Projects to the n-th field.

fn to_op_for_proj( &self, ecx: &InterpCx<'mir, 'tcx, M> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Makes this into an OpTy, in a potentially more expensive way that is good for projections.

impl<'mir, 'tcx: 'mir, M: Machine<'mir, 'tcx>> ValueMut<'mir, 'tcx, M> for MPlaceTy<'tcx, M::Provenance>

fn layout(&self) -> TyAndLayout<'tcx>

Gets this value’s layout.

fn to_op_for_read( &self, _ecx: &InterpCx<'mir, 'tcx, M> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Makes this into an OpTy, in a cheap way that is good for reading.

fn to_op_for_proj( &self, _ecx: &mut InterpCx<'mir, 'tcx, M> ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>

Makes this into an OpTy, in a potentially more expensive way that is good for projections.

fn from_op(op: &OpTy<'tcx, M::Provenance>) -> Self

Creates this from an OpTy.

fn project_downcast( &self, ecx: &mut InterpCx<'mir, 'tcx, M>, variant: VariantIdx ) -> InterpResult<'tcx, Self>

Projects to the given enum variant.

fn project_field( &self, ecx: &mut InterpCx<'mir, 'tcx, M>, field: usize ) -> InterpResult<'tcx, Self>

Projects to the n-th field.

impl<'tcx, Prov: Copy + Provenance> Copy for MPlaceTy<'tcx, Prov>

impl<'tcx, Prov: Eq + Provenance> Eq for MPlaceTy<'tcx, Prov>

impl<'tcx, Prov: Provenance> StructuralEq for MPlaceTy<'tcx, Prov>

impl<'tcx, Prov: Provenance> StructuralPartialEq for MPlaceTy<'tcx, Prov>

Layout

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.