diff options
Diffstat (limited to 'src/test/mir-opt/early_otherwise_branch_soundness.rs')
-rw-r--r-- | src/test/mir-opt/early_otherwise_branch_soundness.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/mir-opt/early_otherwise_branch_soundness.rs b/src/test/mir-opt/early_otherwise_branch_soundness.rs new file mode 100644 index 000000000..cd4589232 --- /dev/null +++ b/src/test/mir-opt/early_otherwise_branch_soundness.rs @@ -0,0 +1,32 @@ +// unit-test: EarlyOtherwiseBranch + +// Tests various cases that the `early_otherwise_branch` opt should *not* optimize + +// From #78496 +enum E<'a> { + Empty, + Some(&'a E<'a>), +} + +// EMIT_MIR early_otherwise_branch_soundness.no_downcast.EarlyOtherwiseBranch.diff +fn no_downcast(e: &E) -> u32 { + if let E::Some(E::Some(_)) = e { 1 } else { 2 } +} + +// SAFETY: if `a` is `Some`, `b` must point to a valid, initialized value +// EMIT_MIR early_otherwise_branch_soundness.no_deref_ptr.EarlyOtherwiseBranch.diff +unsafe fn no_deref_ptr(a: Option<i32>, b: *const Option<i32>) -> i32 { + match a { + // `*b` being correct depends on `a == Some(_)` + Some(_) => match *b { + Some(v) => v, + _ => 0, + }, + _ => 0, + } +} + +fn main() { + no_downcast(&E::Empty); + unsafe { no_deref_ptr(None, std::ptr::null()) }; +} |