use rustc_middle::mir::{Local, Operand, PlaceElem, ProjectionElem};
use rustc_middle::ty::Ty;
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub struct AbstractOperand;
#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
pub struct AbstractType;
pub type AbstractElem = ProjectionElem<AbstractOperand, AbstractType>;
pub trait Lift {
type Abstract;
fn lift(&self) -> Self::Abstract;
}
impl<'tcx> Lift for Operand<'tcx> {
type Abstract = AbstractOperand;
fn lift(&self) -> Self::Abstract {
AbstractOperand
}
}
impl Lift for Local {
type Abstract = AbstractOperand;
fn lift(&self) -> Self::Abstract {
AbstractOperand
}
}
impl<'tcx> Lift for Ty<'tcx> {
type Abstract = AbstractType;
fn lift(&self) -> Self::Abstract {
AbstractType
}
}
impl<'tcx> Lift for PlaceElem<'tcx> {
type Abstract = AbstractElem;
fn lift(&self) -> Self::Abstract {
match *self {
ProjectionElem::Deref => ProjectionElem::Deref,
ProjectionElem::Field(f, ty) => ProjectionElem::Field(f, ty.lift()),
ProjectionElem::OpaqueCast(ty) => ProjectionElem::OpaqueCast(ty.lift()),
ProjectionElem::Index(ref i) => ProjectionElem::Index(i.lift()),
ProjectionElem::Subslice { from, to, from_end } => {
ProjectionElem::Subslice { from, to, from_end }
}
ProjectionElem::ConstantIndex { offset, min_length, from_end } => {
ProjectionElem::ConstantIndex { offset, min_length, from_end }
}
ProjectionElem::Downcast(a, u) => ProjectionElem::Downcast(a, u),
ProjectionElem::Subtype(ty) => ProjectionElem::Subtype(ty.lift()),
}
}
}