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Verifying unit type #5

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Verifying unit type #5

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f9f5371
Added changes for *const T::add & *const::sub verifying unit type
MayureshJoshi25 Oct 7, 2024
eab900e
Updated proofs for const ptr (unit type)
MayureshJoshi25 Oct 12, 2024
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138 changes: 131 additions & 7 deletions library/core/src/ptr/const_ptr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -857,6 +857,10 @@ impl<T: ?Sized> *const T {
#[rustc_const_stable(feature = "const_ptr_offset", since = "1.61.0")]
#[inline(always)]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
#[requires(kani::mem::can_dereference(self))]
// TODO: Determine the valid value range for 'count' and update the precondition accordingly.
#[requires(count == 0)] // This precondition is currently a placeholder.
#[ensures(|result| kani::mem::can_dereference(result))]
pub const unsafe fn add(self, count: usize) -> Self
where
T: Sized,
Expand Down Expand Up @@ -932,6 +936,10 @@ impl<T: ?Sized> *const T {
#[rustc_allow_const_fn_unstable(unchecked_neg)]
#[inline(always)]
#[cfg_attr(miri, track_caller)] // even without panics, this helps for Miri backtraces
#[requires(kani::mem::can_dereference(self))]
// TODO: Determine the valid value range for 'count' and update the precondition accordingly.
#[requires(count == 0)] // This precondition is currently a placeholder.
#[ensures(|result| kani::mem::can_dereference(result))]
pub const unsafe fn sub(self, count: usize) -> Self
where
T: Sized,
Expand Down Expand Up @@ -1787,13 +1795,129 @@ impl<T: ?Sized> PartialOrd for *const T {
#[unstable(feature = "kani", issue = "none")]
mod verify {
use crate::kani;

// fn <*const T>::add verification begin
macro_rules! generate_add_harness {
($type:ty, $proof_name:ident) => {
#[allow(unused)]
#[kani::proof_for_contract(<*const $type>::add)]
pub fn $proof_name() {
let mut test_val: $type = kani::any::<$type>();
let test_ptr: *const $type = &test_val;
let count: usize = kani::any();
unsafe {
test_ptr.add(count);
}
}
};
}

generate_add_harness!(i8, check_add_i8);
generate_add_harness!(i16, check_add_i16);
generate_add_harness!(i32, check_add_i32);
generate_add_harness!(i64, check_add_i64);
generate_add_harness!(i128, check_add_i128);
generate_add_harness!(isize, check_add_isize);
generate_add_harness!(u8, check_add_u8);
generate_add_harness!(u16, check_add_u16);
generate_add_harness!(u32, check_add_u32);
generate_add_harness!(u64, check_add_u64);
generate_add_harness!(u128, check_add_u128);
generate_add_harness!(usize, check_add_usize);
// fn <*const T>::add verification end

// fn <*const T>::sub verification begin
macro_rules! generate_sub_harness {
($type:ty, $proof_name:ident) => {
#[allow(unused)]
#[kani::proof_for_contract(<*const $type>::sub)]
pub fn $proof_name() {
let mut test_val: $type = kani::any::<$type>();
let test_ptr: *const $type = &test_val;
let count: usize = kani::any();
unsafe {
test_ptr.sub(count);
}
}
};
}

generate_sub_harness!(i8, check_sub_i8);
generate_sub_harness!(i16, check_sub_i16);
generate_sub_harness!(i32, check_sub_i32);
generate_sub_harness!(i64, check_sub_i64);
generate_sub_harness!(i128, check_sub_i128);
generate_sub_harness!(isize, check_sub_isize);
generate_sub_harness!(u8, check_sub_u8);
generate_sub_harness!(u16, check_sub_u16);
generate_sub_harness!(u32, check_sub_u32);
generate_sub_harness!(u64, check_sub_u64);
generate_sub_harness!(u128, check_sub_u128);
generate_sub_harness!(usize, check_sub_usize);
// fn <*const T>::sub verification end

// fn <*const T>::offset verification begin
macro_rules! generate_offset_harness {
($type:ty, $proof_name:ident) => {
#[allow(unused)]
#[kani::proof_for_contract(<*const $type>::offset)]
pub fn $proof_name() {
let mut test_val: $type = kani::any::<$type>();
let test_ptr: *const $type = &test_val;
let count: isize = kani::any();
unsafe {
test_ptr.offset(count);
}
}
};
}

generate_offset_harness!(i8, check_offset_i8);
generate_offset_harness!(i16, check_offset_i16);
generate_offset_harness!(i32, check_offset_i32);
generate_offset_harness!(i64, check_offset_i64);
generate_offset_harness!(i128, check_offset_i128);
generate_offset_harness!(isize, check_offset_isize);
generate_offset_harness!(u8, check_offset_u8);
generate_offset_harness!(u16, check_offset_u16);
generate_offset_harness!(u32, check_offset_u32);
generate_offset_harness!(u64, check_offset_u64);
generate_offset_harness!(u128, check_offset_u128);
generate_offset_harness!(usize, check_offset_usize);
// fn <*const T>::offset verification end

// Unit type proofs start


macro_rules! generate_const_unit_harness {
($fn_name:ident, $proof_name:ident) => {
#[allow(unused)]
#[kani::proof_for_contract(<*const ()>::$fn_name)]
pub fn $proof_name() {
let test_val: () = ();
let test_ptr: *const () = &test_val;
let count: usize = kani::any();
unsafe {
test_ptr.$fn_name(count);
}
}
};
}

generate_const_unit_harness!(add, check_const_add_unit);
generate_const_unit_harness!(sub, check_const_sub_unit);

#[allow(unused)]
#[kani::proof_for_contract(<*const i32>::offset)]
fn check_offset_i32() {
let mut test_val: i32 = kani::any();
let test_ptr: *const i32 = &test_val;
let offset: isize = kani::any();
unsafe { test_ptr.offset(offset) };
}
#[kani::proof_for_contract(<*const ()>::offset)]
pub fn check_const_offset_unit() {
let test_val: () = ();
let test_ptr: *const () = &test_val;
let count: isize = kani::any();
unsafe {
test_ptr.offset(count);
}
}
// Unit type proofs end


}