src/tools/miri/tests/pass/alloc-access-tracking.rs


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#![feature(start)]
#![no_std]
//@compile-flags: -Zmiri-track-alloc-id=20 -Zmiri-track-alloc-accesses -Cpanic=abort
//@normalize-stderr-test: "id 20" -> "id $$ALLOC"
//@only-target-linux: alloc IDs differ between OSes (due to extern static allocations)

extern "Rust" {
    fn miri_alloc(size: usize, align: usize) -> *mut u8;
    fn miri_dealloc(ptr: *mut u8, size: usize, align: usize);
}

#[start]
fn start(_: isize, _: *const *const u8) -> isize {
    unsafe {
        let ptr = miri_alloc(123, 1);
        *ptr = 42; // Crucially, only a write is printed here, no read!
        assert_eq!(*ptr, 42);
        miri_dealloc(ptr, 123, 1);
    }
    0
}

#[panic_handler]
fn panic_handler(_: &core::panic::PanicInfo) -> ! {
    loop {}
}