1 use crate::transform::{MirPass, MirSource};
2 use crate::util::expand_aggregate;
3 use rustc_middle::mir::*;
4 use rustc_middle::ty::TyCtxt;
6 pub struct Deaggregator;
8 impl<'tcx> MirPass<'tcx> for Deaggregator {
9 fn run_pass(&self, tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
10 let (basic_blocks, local_decls) = body.basic_blocks_and_local_decls_mut();
11 let local_decls = &*local_decls;
12 for bb in basic_blocks {
13 bb.expand_statements(|stmt| {
14 // FIXME(eddyb) don't match twice on `stmt.kind` (post-NLL).
16 // FIXME(#48193) Deaggregate arrays when it's cheaper to do so.
17 StatementKind::Assign(box (
19 Rvalue::Aggregate(box AggregateKind::Array(_), _),
23 StatementKind::Assign(box (_, Rvalue::Aggregate(_, _))) => {}
27 let stmt = stmt.replace_nop();
28 let source_info = stmt.source_info;
29 let (lhs, kind, operands) = match stmt.kind {
30 StatementKind::Assign(box (lhs, Rvalue::Aggregate(kind, operands))) => {
36 Some(expand_aggregate(
38 operands.into_iter().map(|op| {
39 let ty = op.ty(local_decls, tcx);