src/test/ui/abi/stack-probes.rs

   1 // run-pass
   2 // ignore-arm
   3 // ignore-aarch64
   4 // ignore-mips
   5 // ignore-mips64
   6 // ignore-powerpc
   7 // ignore-s390x
   8 // ignore-sparc
   9 // ignore-sparc64
  10 // ignore-wasm
  11 // ignore-cloudabi no processes
  12 // ignore-emscripten no processes
  13 // ignore-sgx no processes
  14 // ignore-musl FIXME #31506
  15
  16 use std::mem::MaybeUninit;
  17 use std::process::Command;
  18 use std::thread;
  19 use std::env;
  20
  21 #[link(name = "rust_test_helpers", kind = "static")]
  22 extern {
  23     #[link_name = "rust_dbg_extern_identity_u64"]
  24     fn black_box(u: u64);
  25 }
  26
  27 fn main() {
  28     let args = env::args().skip(1).collect::<Vec<_>>();
  29     if args.len() > 0 {
  30         match &args[0][..] {
  31             "main-thread" => recurse(&MaybeUninit::uninit()),
  32             "child-thread" => thread::spawn(|| recurse(&MaybeUninit::uninit())).join().unwrap(),
  33             _ => panic!(),
  34         }
  35         return
  36     }
  37
  38     let me = env::current_exe().unwrap();
  39
  40     // The linux kernel has some different behavior for the main thread because
  41     // the main thread's stack can typically grow. We can't always guarantee
  42     // that we report stack overflow on the main thread, see #43052 for some
  43     // details
  44     if cfg!(not(target_os = "linux")) {
  45         assert_overflow(Command::new(&me).arg("main-thread"));
  46     }
  47     assert_overflow(Command::new(&me).arg("child-thread"));
  48 }
  49
  50 #[allow(unconditional_recursion)]
  51 fn recurse(array: &MaybeUninit<[u64; 1024]>) {
  52     unsafe {
  53         black_box(array.as_ptr() as u64);
  54     }
  55     let local: MaybeUninit<[u64; 1024]> = MaybeUninit::uninit();
  56     recurse(&local);
  57 }
  58
  59 fn assert_overflow(cmd: &mut Command) {
  60     let output = cmd.output().unwrap();
  61     assert!(!output.status.success());
  62     let stdout = String::from_utf8_lossy(&output.stdout);
  63     let stderr = String::from_utf8_lossy(&output.stderr);
  64     println!("status: {}", output.status);
  65     println!("stdout: {}", stdout);
  66     println!("stderr: {}", stderr);
  67     assert!(stdout.is_empty());
  68     assert!(stderr.contains("has overflowed its stack\n"));
  69 }