diff options
Diffstat (limited to 'src/tools/clippy/tests/ui/size_of_in_element_count/expressions.rs')
-rw-r--r-- | src/tools/clippy/tests/ui/size_of_in_element_count/expressions.rs | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/tools/clippy/tests/ui/size_of_in_element_count/expressions.rs b/src/tools/clippy/tests/ui/size_of_in_element_count/expressions.rs new file mode 100644 index 000000000..2594e8fa6 --- /dev/null +++ b/src/tools/clippy/tests/ui/size_of_in_element_count/expressions.rs @@ -0,0 +1,37 @@ +#![warn(clippy::size_of_in_element_count)] +#![allow(clippy::ptr_offset_with_cast)] + +use std::mem::{size_of, size_of_val}; +use std::ptr::{copy, copy_nonoverlapping, write_bytes}; + +fn main() { + const SIZE: usize = 128; + const HALF_SIZE: usize = SIZE / 2; + const DOUBLE_SIZE: usize = SIZE * 2; + let mut x = [2u8; SIZE]; + let mut y = [2u8; SIZE]; + + // Count expression involving multiplication of size_of (Should trigger the lint) + unsafe { copy_nonoverlapping(x.as_ptr(), y.as_mut_ptr(), size_of::<u8>() * SIZE) }; + + // Count expression involving nested multiplications of size_of (Should trigger the lint) + unsafe { copy_nonoverlapping(x.as_ptr(), y.as_mut_ptr(), HALF_SIZE * size_of_val(&x[0]) * 2) }; + + // Count expression involving divisions of size_of (Should trigger the lint) + unsafe { copy(x.as_ptr(), y.as_mut_ptr(), DOUBLE_SIZE * size_of::<u8>() / 2) }; + + // Count expression involving divisions by size_of (Should not trigger the lint) + unsafe { copy(x.as_ptr(), y.as_mut_ptr(), DOUBLE_SIZE / size_of::<u8>()) }; + + // Count expression involving divisions by multiple size_of (Should not trigger the lint) + unsafe { copy(x.as_ptr(), y.as_mut_ptr(), DOUBLE_SIZE / (2 * size_of::<u8>())) }; + + // Count expression involving recursive divisions by size_of (Should trigger the lint) + unsafe { copy(x.as_ptr(), y.as_mut_ptr(), DOUBLE_SIZE / (2 / size_of::<u8>())) }; + + // No size_of calls (Should not trigger the lint) + unsafe { copy(x.as_ptr(), y.as_mut_ptr(), SIZE) }; + + // Different types for pointee and size_of (Should not trigger the lint) + unsafe { y.as_mut_ptr().write_bytes(0u8, size_of::<u16>() / 2 * SIZE) }; +} |