src/test/run-pass/issues/issue-28950.rs

   1 // Copyright 2012-2016 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 // run-pass
  12 // ignore-emscripten no threads
  13 // compile-flags: -O
  14
  15 // Tests that the `vec!` macro does not overflow the stack when it is
  16 // given data larger than the stack.
  17
  18 // FIXME(eddyb) Improve unoptimized codegen to avoid the temporary,
  19 // and thus run successfully even when compiled at -C opt-level=0.
  20
  21 const LEN: usize = 1 << 15;
  22
  23 use std::thread::Builder;
  24
  25 fn main() {
  26     assert!(Builder::new().stack_size(LEN / 2).spawn(|| {
  27         // FIXME(eddyb) this can be vec![[0: LEN]] pending
  28         // https://llvm.org/bugs/show_bug.cgi?id=28987
  29         let vec = vec![unsafe { std::mem::zeroed::<[u8; LEN]>() }];
  30         assert_eq!(vec.len(), 1);
  31     }).unwrap().join().is_ok());
  32 }