c1a5329475
Specifically ptr::{sub, wrapping_sub, add, wrapping_add, offset, wrapping_offset} and slice::{from_raw_parts, from_raw_parts_mut}
The lint now also looks for size_of calls through casts (Since offset takes an isize)
61 lines
2.7 KiB
Rust
61 lines
2.7 KiB
Rust
#![warn(clippy::size_of_in_element_count)]
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#![allow(clippy::ptr_offset_with_cast)]
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use std::mem::{size_of, size_of_val};
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use std::ptr::{
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copy, copy_nonoverlapping, slice_from_raw_parts, slice_from_raw_parts_mut, swap_nonoverlapping, write_bytes,
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};
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use std::slice::{from_raw_parts, from_raw_parts_mut};
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fn main() {
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const SIZE: usize = 128;
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const HALF_SIZE: usize = SIZE / 2;
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const DOUBLE_SIZE: usize = SIZE * 2;
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let mut x = [2u8; SIZE];
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let mut y = [2u8; SIZE];
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// Count is size_of (Should trigger the lint)
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unsafe { copy_nonoverlapping::<u8>(x.as_ptr(), y.as_mut_ptr(), size_of::<u8>()) };
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unsafe { copy_nonoverlapping(x.as_ptr(), y.as_mut_ptr(), size_of_val(&x[0])) };
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unsafe { x.as_ptr().copy_to(y.as_mut_ptr(), size_of::<u8>()) };
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unsafe { x.as_ptr().copy_to_nonoverlapping(y.as_mut_ptr(), size_of::<u8>()) };
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unsafe { y.as_mut_ptr().copy_from(x.as_ptr(), size_of::<u8>()) };
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unsafe { y.as_mut_ptr().copy_from_nonoverlapping(x.as_ptr(), size_of::<u8>()) };
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unsafe { copy(x.as_ptr(), y.as_mut_ptr(), size_of::<u8>()) };
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unsafe { copy(x.as_ptr(), y.as_mut_ptr(), size_of_val(&x[0])) };
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unsafe { y.as_mut_ptr().write_bytes(0u8, size_of::<u8>() * SIZE) };
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unsafe { write_bytes(y.as_mut_ptr(), 0u8, size_of::<u8>() * SIZE) };
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unsafe { swap_nonoverlapping(y.as_mut_ptr(), x.as_mut_ptr(), size_of::<u8>() * SIZE) };
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slice_from_raw_parts_mut(y.as_mut_ptr(), size_of::<u8>() * SIZE);
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slice_from_raw_parts(y.as_ptr(), size_of::<u8>() * SIZE);
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unsafe { from_raw_parts_mut(y.as_mut_ptr(), size_of::<u8>() * SIZE) };
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unsafe { from_raw_parts(y.as_ptr(), size_of::<u8>() * SIZE) };
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unsafe { y.as_mut_ptr().sub(size_of::<u8>()) };
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y.as_ptr().wrapping_sub(size_of::<u8>());
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unsafe { y.as_ptr().add(size_of::<u8>()) };
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y.as_mut_ptr().wrapping_add(size_of::<u8>());
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unsafe { y.as_ptr().offset(size_of::<u8>() as isize) };
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y.as_mut_ptr().wrapping_offset(size_of::<u8>() as isize);
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// Count expression involving multiplication of size_of (Should trigger the lint)
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unsafe { copy_nonoverlapping(x.as_ptr(), y.as_mut_ptr(), size_of::<u8>() * SIZE) };
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// Count expression involving nested multiplications of size_of (Should trigger the lint)
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unsafe { copy_nonoverlapping(x.as_ptr(), y.as_mut_ptr(), HALF_SIZE * size_of_val(&x[0]) * 2) };
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// Count expression involving divisions of size_of (Should trigger the lint)
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unsafe { copy(x.as_ptr(), y.as_mut_ptr(), DOUBLE_SIZE * size_of::<u8>() / 2) };
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// No size_of calls (Should not trigger the lint)
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unsafe { copy(x.as_ptr(), y.as_mut_ptr(), SIZE) };
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// Different types for pointee and size_of (Should not trigger the lint)
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unsafe { y.as_mut_ptr().write_bytes(0u8, size_of::<u16>() / 2 * SIZE) };
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}
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