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