| //! SSA analysis |
| |
| use rustc_index::IndexVec; |
| use rustc_middle::mir::StatementKind::*; |
| use rustc_middle::ty::Ty; |
| |
| use crate::prelude::*; |
| |
| #[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)] |
| pub(crate) enum SsaKind { |
| NotSsa, |
| MaybeSsa, |
| } |
| |
| impl SsaKind { |
| pub(crate) fn is_ssa<'tcx>(self, fx: &FunctionCx<'_, '_, 'tcx>, ty: Ty<'tcx>) -> bool { |
| self == SsaKind::MaybeSsa && (fx.clif_type(ty).is_some() || fx.clif_pair_type(ty).is_some()) |
| } |
| } |
| |
| pub(crate) fn analyze(fx: &FunctionCx<'_, '_, '_>) -> IndexVec<Local, SsaKind> { |
| let mut flag_map = |
| fx.mir.local_decls.iter().map(|_| SsaKind::MaybeSsa).collect::<IndexVec<Local, SsaKind>>(); |
| |
| for bb in fx.mir.basic_blocks.iter() { |
| for stmt in bb.statements.iter() { |
| match &stmt.kind { |
| Assign(place_and_rval) => match &place_and_rval.1 { |
| Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => { |
| flag_map[place.local] = SsaKind::NotSsa; |
| } |
| _ => {} |
| }, |
| _ => {} |
| } |
| } |
| } |
| |
| flag_map |
| } |