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Fix leaks from panics in destructors #125923

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Fix leaks from panics in destructors #125923

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a4e6b77
Extend handling of moved_locals in mir building to some unwind paths
matthewjasper May 31, 2024
1bcdc2e
Use record_operands_moved more in mir building
matthewjasper May 31, 2024
f547dc8
Avoid leaking values when panicking in certain cases
matthewjasper May 31, 2024
8b4edef
Fix performance issue with `record_operands_moved`
matthewjasper Jun 5, 2024
3e0db6a
Work around opaque types hiding needs_drop
matthewjasper Jun 24, 2024
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4 changes: 4 additions & 0 deletions compiler/rustc_mir_build/src/build/scope.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -90,6 +90,7 @@ use rustc_index::{IndexSlice, IndexVec};
use rustc_middle::middle::region;
use rustc_middle::mir::*;
use rustc_middle::thir::{ExprId, LintLevel};
use rustc_middle::ty::TypeVisitableExt;
use rustc_middle::{bug, span_bug};
use rustc_session::lint::Level;
use rustc_span::{Span, DUMMY_SP};
Expand Down Expand Up @@ -1141,6 +1142,9 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
{
return;
}
// Opaque type may not have been scheduled if its underlying
// type does not need drop.
None if self.local_decls[local].ty.has_opaque_types() => return,

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so the affected code is

fn if_no_else(c: bool) -> impl Sized {
    if c {}
}

where the opaque type gets unified with () and () does not need drop while impl Sized does? 🤔 we probably never emit drop for the return value of an if without an else block or sth?

_ => bug!(
"found wrong drop, expected value drop of {:?}, found {:?}",
local,
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22 changes: 22 additions & 0 deletions tests/ui/impl-trait/rpit/non-drop-type.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
//@ check-pass

fn if_else(c: bool) -> impl Sized {
if c { () } else { () }
}

fn if_no_else(c: bool) -> impl Sized {
if c {}
}

fn matches(c: bool) -> impl Sized {
match c {
true => (),
_ => (),
}
}

fn tuple_tuple(c: bool) -> (impl Sized,) {
if c { ((),) } else { ((),) }
}

fn main() {}
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