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