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Diffstat (limited to 'tests/ui/codegen/issue-28950.rs')
-rw-r--r-- | tests/ui/codegen/issue-28950.rs | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/codegen/issue-28950.rs b/tests/ui/codegen/issue-28950.rs new file mode 100644 index 000000000..8b55f42f3 --- /dev/null +++ b/tests/ui/codegen/issue-28950.rs @@ -0,0 +1,22 @@ +// run-pass +// ignore-emscripten no threads +// compile-flags: -O + +// Tests that the `vec!` macro does not overflow the stack when it is +// given data larger than the stack. + +// FIXME(eddyb) Improve unoptimized codegen to avoid the temporary, +// and thus run successfully even when compiled at -C opt-level=0. + +const LEN: usize = 1 << 15; + +use std::thread::Builder; + +fn main() { + assert!(Builder::new().stack_size(LEN / 2).spawn(|| { + // FIXME(eddyb) this can be vec![[0: LEN]] pending + // https://llvm.org/bugs/show_bug.cgi?id=28987 + let vec = vec![unsafe { std::mem::zeroed::<[u8; LEN]>() }]; + assert_eq!(vec.len(), 1); + }).unwrap().join().is_ok()); +} |