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Update test small_slice_eq #3618

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Oct 21, 2024
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Update test small_slice_eq #3618

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20 changes: 13 additions & 7 deletions tests/expected/loop-contract/small_slice_eq.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,20 +6,25 @@
// Modifications Copyright Kani Contributors
// See GitHub history for details.

// kani-flags: -Z loop-contracts --enable-unstable --cbmc-args --arrays-uf-always --no-standard-checks --object-bits 8
// kani-flags: -Z loop-contracts -Z mem-predicates --enable-unstable --cbmc-args --object-bits 8

//! Check if loop contracts are correctly applied. The flag --no-standard-checks should be
//! removed once same_object predicate is supported in loop contracts.
//! Check if loop contracts are correctly applied.

#![feature(stmt_expr_attributes)]
#![feature(proc_macro_hygiene)]
#![feature(ptr_sub_ptr)]

extern crate kani;

use kani::mem::same_allocation;

unsafe fn small_slice_eq(x: &[u8], y: &[u8]) -> bool {
debug_assert_eq!(x.len(), y.len());
unsafe {
let (mut px, mut py) = (x.as_ptr(), y.as_ptr());
let (pxend, pyend) = (px.add(x.len() - 4), py.add(y.len() - 4));
#[kani::loop_invariant( px as isize >= x.as_ptr() as isize
#[kani::loop_invariant( same_allocation(x.as_ptr(), px) && same_allocation(y.as_ptr(), py)
&& px as isize >= x.as_ptr() as isize
&& py as isize >= y.as_ptr() as isize
&& px as isize - x.as_ptr() as isize == (py as isize - y.as_ptr() as isize))]
while px < pxend {
Expand All @@ -43,9 +48,10 @@ fn small_slice_eq_harness() {
// because DFCC contract enforcement assumes that a definition for `free`
// exists.
let _ = Box::new(10);
let mut a = [1; 2000];
let mut b = [1; 2000];
const ARR_SIZE: usize = 2000;
let x: [u8; ARR_SIZE] = kani::any();
let y: [u8; ARR_SIZE] = kani::any();
unsafe {
small_slice_eq(&mut a, &mut b);
small_slice_eq(&x, &y);
}
}
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