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[const-prop] Replace NullaryOp handling with use of InterpCx

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This commit is contained in:
Wesley Wiser 2019-09-06 05:49:18 -04:00
parent ecc4cc2fc4
commit 1c219bb34b
1 changed files with 7 additions and 21 deletions
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28
src/librustc_mir/transform/const_prop.rs
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@ -304,9 +304,15 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
) -> Option<Const<'tcx>> {
let span = source_info.span;
match *rvalue {
Rvalue::Repeat(..) |
Rvalue::Aggregate(..) |
Rvalue::NullaryOp(NullOp::Box, _) |
Rvalue::Discriminant(..) => None,
Rvalue::Use(_) |
Rvalue::Len(_) |
Rvalue::Cast(..) => {
Rvalue::Cast(..) |
Rvalue::NullaryOp(..) => {
self.use_ecx(source_info, |this| {
this.ecx.eval_rvalue_into_place(rvalue, place)?;
this.ecx.eval_place_to_op(place, Some(place_layout))
@ -317,19 +323,7 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
let mplace = src.try_as_mplace().ok()?;
Some(ImmTy::from_scalar(mplace.ptr.into(), place_layout).into())
},
Rvalue::Repeat(..) |
Rvalue::Aggregate(..) |
Rvalue::NullaryOp(NullOp::Box, _) |
Rvalue::Discriminant(..) => None,
Rvalue::NullaryOp(NullOp::SizeOf, ty) => {
type_size_of(self.tcx, self.param_env, ty).and_then(|n| Some(
ImmTy::from_uint(
n,
self.tcx.layout_of(self.param_env.and(self.tcx.types.usize)).ok()?,
).into()
))
}
Rvalue::UnaryOp(op, ref arg) => {
let def_id = if self.tcx.is_closure(self.source.def_id()) {
self.tcx.closure_base_def_id(self.source.def_id())
@ -515,14 +509,6 @@ impl<'mir, 'tcx> ConstPropagator<'mir, 'tcx> {
}
}
fn type_size_of<'tcx>(
tcx: TyCtxt<'tcx>,
param_env: ty::ParamEnv<'tcx>,
ty: Ty<'tcx>,
) -> Option<u64> {
tcx.layout_of(param_env.and(ty)).ok().map(|layout| layout.size.bytes())
}
struct CanConstProp {
can_const_prop: IndexVec<Local, bool>,
// false at the beginning, once set, there are not allowed to be any more assignments