src/test/ui/sanitize/memory-eager.rs

   1 // needs-sanitizer-support
   2 // needs-sanitizer-memory
   3 // min-llvm-version: 14.0.0
   4 //
   5 // revisions: unoptimized optimized
   6 //
   7 // [optimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins -O
   8 // [unoptimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins
   9 //
  10 // run-fail
  11 // error-pattern: MemorySanitizer: use-of-uninitialized-value
  12 // error-pattern: Uninitialized value was created by an allocation
  13 // error-pattern: in the stack frame
  14 //
  15 // This test case intentionally limits the usage of the std,
  16 // since it will be linked with an uninstrumented version of it.
  17
  18 #![feature(core_intrinsics)]
  19 #![feature(start)]
  20
  21 use std::hint::black_box;
  22 use std::mem::MaybeUninit;
  23
  24 #[inline(never)]
  25 #[no_mangle]
  26 #[allow(invalid_value)]
  27 fn random() -> char {
  28     let r = unsafe { MaybeUninit::uninit().assume_init() };
  29     // Avoid optimizing everything out.
  30     black_box(r)
  31 }
  32
  33 #[start]
  34 fn main(_: isize, _: *const *const u8) -> isize {
  35     random();
  36     0
  37 }