bjoernager/rust
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destroy temp at the end and avoid ICE

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This commit is contained in:
ouz-a 2022-04-04 23:46:21 +03:00
parent 105e90f836
commit 904d6c8662
4 changed files with 14 additions and 11 deletions
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17
compiler/rustc_mir_transform/src/deref_separator.rs
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@ -8,11 +8,15 @@ pub fn deref_finder<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
let mut patch = MirPatch::new(body);
let (basic_blocks, local_decl) = body.basic_blocks_and_local_decls_mut();
for (block, data) in basic_blocks.iter_enumerated_mut() {
let statement_len = data.statements.len();
for (i, stmt) in data.statements.iter_mut().enumerate() {
match stmt.kind {
StatementKind::Assign(box (og_place, Rvalue::Ref(region, borrow_knd, place))) => {
for (idx, (p_ref, p_elem)) in place.iter_projections().enumerate() {
if p_elem == ProjectionElem::Deref && !p_ref.projection.is_empty() {
if p_elem == ProjectionElem::Deref
&& !p_ref.projection.is_empty()
&& region.is_erased()
{
// The type that we are derefing
let ty = p_ref.ty(local_decl, tcx).ty;
let temp = patch.new_temp(ty, stmt.source_info.span);
@ -36,12 +40,6 @@ pub fn deref_finder<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
// and copying derefed values which we need to create new statement
let temp_place =
Place::from(temp).project_deeper(&place.projection[idx..], tcx);
patch.add_assign(
loc,
og_place,
Rvalue::Ref(region, borrow_knd, temp_place),
);
let new_stmt = Statement {
source_info: stmt.source_info,
kind: StatementKind::Assign(Box::new((
@ -49,8 +47,13 @@ pub fn deref_finder<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
Rvalue::Ref(region, borrow_knd, temp_place),
))),
};
// Replace current statement with newly created one
*stmt = new_stmt;
// Since our job with the temp is done it should be gone
let loc = Location { block: block, statement_index: statement_len };
patch.add_statement(loc, StatementKind::StorageDead(temp));
}
}
}