Trait rustc_const_eval::interpret::visitor::Value

pub trait Value<'mir, 'tcx, M: Machine<'mir, 'tcx>>: Sized {
    // Required methods
    fn layout(&self) -> TyAndLayout<'tcx>;
    fn to_op_for_read(
        &self,
        ecx: &InterpCx<'mir, 'tcx, M>
    ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>>;
    fn from_op(op: &OpTy<'tcx, M::Provenance>) -> Self;
    fn project_downcast(
        &self,
        ecx: &InterpCx<'mir, 'tcx, M>,
        variant: VariantIdx
    ) -> InterpResult<'tcx, Self>;
    fn project_field(
        &self,
        ecx: &InterpCx<'mir, 'tcx, M>,
        field: usize
    ) -> InterpResult<'tcx, Self>;

    // Provided method
    fn to_op_for_proj(
        &self,
        ecx: &InterpCx<'mir, 'tcx, M>
    ) -> InterpResult<'tcx, OpTy<'tcx, M::Provenance>> { ... }
}

A thing that we can project into, and that has a layout. This wouldn’t have to depend on Machine but with the current type inference, that’s just more convenient to work with (avoids repeating all the Machine bounds).

Required Methods

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.

If to_op_for_proj only ever produces Indirect operands, then this one is definitely Indirect.

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.

Provided Methods

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.

Implementors

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

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