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// needs-sanitizer-support
// needs-sanitizer-memory
//
// revisions: unoptimized optimized
//
// [optimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins -O
// [unoptimized]compile-flags: -Z sanitizer=memory -Zsanitizer-memory-track-origins
//
// run-fail
// error-pattern: MemorySanitizer: use-of-uninitialized-value
// error-pattern: Uninitialized value was created by an allocation
// error-pattern: in the stack frame
//
// This test case intentionally limits the usage of the std,
// since it will be linked with an uninstrumented version of it.
#![feature(core_intrinsics)]
#![feature(start)]
#![allow(invalid_value)]
use std::hint::black_box;
use std::mem::MaybeUninit;
#[inline(never)]
#[no_mangle]
fn random() -> [isize; 32] {
let r = MaybeUninit::uninit();
// Avoid optimizing everything out.
unsafe { std::intrinsics::volatile_load(r.as_ptr()) }
}
#[inline(never)]
#[no_mangle]
fn xor(a: &[isize]) -> isize {
let mut s = 0;
for i in 0..a.len() {
s = s ^ a[i];
}
s
}
#[start]
fn main(_: isize, _: *const *const u8) -> isize {
let r = black_box(random as fn() -> [isize; 32])();
xor(&r)
}
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