3298de7f66
Closes: #6995 Signed-off-by: Federico Guerinoni <guerinoni.federico@gmail.com> Co-authored-by: Paolo Barbolini <paolo@paolo565.org>
38 lines
1.0 KiB
Rust
38 lines
1.0 KiB
Rust
//! Test casts for alignment issues
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#![feature(rustc_private)]
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extern crate libc;
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#[warn(clippy::cast_ptr_alignment)]
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#[allow(
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clippy::no_effect,
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clippy::unnecessary_operation,
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clippy::cast_lossless,
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clippy::borrow_as_ptr
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)]
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fn main() {
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/* These should be warned against */
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// cast to more-strictly-aligned type
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(&1u8 as *const u8) as *const u16;
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(&mut 1u8 as *mut u8) as *mut u16;
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// cast to more-strictly-aligned type, but with the `pointer::cast` function.
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(&1u8 as *const u8).cast::<u16>();
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(&mut 1u8 as *mut u8).cast::<u16>();
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/* These should be ok */
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// not a pointer type
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1u8 as u16;
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// cast to less-strictly-aligned type
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(&1u16 as *const u16) as *const u8;
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(&mut 1u16 as *mut u16) as *mut u8;
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// For c_void, we should trust the user. See #2677
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(&1u32 as *const u32 as *const std::os::raw::c_void) as *const u32;
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(&1u32 as *const u32 as *const libc::c_void) as *const u32;
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// For ZST, we should trust the user. See #4256
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(&1u32 as *const u32 as *const ()) as *const u32;
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}
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