107 lines
3.1 KiB
Rust
107 lines
3.1 KiB
Rust
#![warn(clippy::transmute_ptr_to_ptr)]
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#![allow(clippy::borrow_as_ptr, clippy::missing_transmute_annotations)]
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use std::mem::transmute;
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// Make sure we can modify lifetimes, which is one of the recommended uses
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// of transmute
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// Make sure we can do static lifetime transmutes
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unsafe fn transmute_lifetime_to_static<'a, T>(t: &'a T) -> &'static T {
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transmute::<&'a T, &'static T>(t)
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}
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// Make sure we can do non-static lifetime transmutes
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unsafe fn transmute_lifetime<'a, 'b, T>(t: &'a T, u: &'b T) -> &'b T {
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transmute::<&'a T, &'b T>(t)
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}
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struct LifetimeParam<'a> {
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s: &'a str,
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}
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struct GenericParam<T> {
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t: T,
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}
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fn transmute_ptr_to_ptr() {
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let ptr = &1u32 as *const u32;
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let mut_ptr = &mut 1u32 as *mut u32;
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unsafe {
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// pointer-to-pointer transmutes; bad
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let _: *const f32 = ptr.cast::<f32>();
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//~^ transmute_ptr_to_ptr
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let _: *mut f32 = mut_ptr.cast::<f32>();
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//~^ transmute_ptr_to_ptr
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// ref-ref transmutes; bad
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let _: &f32 = &*(&1u32 as *const u32 as *const f32);
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//~^ transmute_ptr_to_ptr
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let _: &f32 = &*(&1f64 as *const f64 as *const f32);
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//~^ transmute_ptr_to_ptr
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//:^ this test is here because both f32 and f64 are the same TypeVariant, but they are not
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// the same type
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let _: &mut f32 = &mut *(&mut 1u32 as *mut u32 as *mut f32);
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//~^ transmute_ptr_to_ptr
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let _: &GenericParam<f32> = &*(&GenericParam { t: 1u32 } as *const GenericParam<u32> as *const GenericParam<f32>);
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//~^ transmute_ptr_to_ptr
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let u64_ref: &u64 = &0u64;
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let u8_ref: &u8 = &*(u64_ref as *const u64 as *const u8);
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//~^ transmute_ptr_to_ptr
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let _: *const u32 = mut_ptr.cast_const();
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//~^ transmute_ptr_to_ptr
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let _: *mut u32 = ptr.cast_mut();
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//~^ transmute_ptr_to_ptr
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}
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// transmute internal lifetimes, should not lint
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let s = "hello world".to_owned();
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let lp = LifetimeParam { s: &s };
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let _: &LifetimeParam<'static> = unsafe { transmute(&lp) };
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let _: &GenericParam<&LifetimeParam<'static>> = unsafe { transmute(&GenericParam { t: &lp }) };
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}
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fn lifetime_to_static(v: *mut &()) -> *const &'static () {
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unsafe { v as *const &() }
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//~^ transmute_ptr_to_ptr
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}
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// dereferencing raw pointers in const contexts, should not lint as it's unstable (issue 5959)
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const _: &() = {
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struct Zst;
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let zst = &Zst;
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unsafe { transmute::<&'static Zst, &'static ()>(zst) }
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};
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#[clippy::msrv = "1.37"]
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fn msrv_1_37(ptr: *const u8) {
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unsafe {
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let _: *const i8 = ptr as *const i8;
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}
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}
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#[clippy::msrv = "1.38"]
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fn msrv_1_38(ptr: *const u8) {
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unsafe {
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let _: *const i8 = ptr.cast::<i8>();
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}
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}
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#[clippy::msrv = "1.64"]
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fn msrv_1_64(ptr: *const u8, mut_ptr: *mut u8) {
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unsafe {
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let _: *mut u8 = ptr as *mut u8;
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let _: *const u8 = mut_ptr as *const u8;
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}
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}
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#[clippy::msrv = "1.65"]
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fn msrv_1_65(ptr: *const u8, mut_ptr: *mut u8) {
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unsafe {
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let _: *mut u8 = ptr.cast_mut();
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let _: *const u8 = mut_ptr.cast_const();
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}
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}
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fn main() {}
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