-#![feature(tool_lints)]
-
-
#![allow(dead_code)]
extern crate core;
let _: *const U = core::intrinsics::transmute(t);
}
-#[warn(clippy::transmute_ptr_to_ref)]
-unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
- let _: &T = std::mem::transmute(p);
- let _: &T = &*p;
-
- let _: &mut T = std::mem::transmute(m);
- let _: &mut T = &mut *m;
-
- let _: &T = std::mem::transmute(m);
- let _: &T = &*m;
-
- let _: &mut T = std::mem::transmute(p as *mut T);
- let _ = &mut *(p as *mut T);
-
- let _: &T = std::mem::transmute(o);
- let _: &T = &*(o as *const T);
-
- let _: &mut T = std::mem::transmute(om);
- let _: &mut T = &mut *(om as *mut T);
-
- let _: &T = std::mem::transmute(om);
- let _: &T = &*(om as *const T);
-}
-
-#[warn(clippy::transmute_ptr_to_ref)]
-fn issue1231() {
- struct Foo<'a, T: 'a> {
- bar: &'a T,
- }
-
- let raw = 42 as *const i32;
- let _: &Foo<u8> = unsafe { std::mem::transmute::<_, &Foo<_>>(raw) };
-
- let _: &Foo<&u8> = unsafe { std::mem::transmute::<_, &Foo<&_>>(raw) };
-
- type Bar<'a> = &'a u8;
- let raw = 42 as *const i32;
- unsafe { std::mem::transmute::<_, Bar>(raw) };
-}
-
#[warn(clippy::useless_transmute)]
fn useless() {
unsafe {
let _: Vec<i32> = my_transmute(my_vec());
- let _: Vec<u32> = core::intrinsics::transmute(my_vec());
- let _: Vec<u32> = core::mem::transmute(my_vec());
- let _: Vec<u32> = std::intrinsics::transmute(my_vec());
- let _: Vec<u32> = std::mem::transmute(my_vec());
- let _: Vec<u32> = my_transmute(my_vec());
-
let _: *const usize = std::mem::transmute(5_isize);
- let _ = 5_isize as *const usize;
+ let _ = 5_isize as *const usize;
- let _: *const usize = std::mem::transmute(1+1usize);
+ let _: *const usize = std::mem::transmute(1 + 1usize);
- let _ = (1+1_usize) as *const usize;
+ let _ = (1 + 1_usize) as *const usize;
}
}
let _: &mut str = unsafe { std::mem::transmute(mb) };
}
-// Make sure we can modify lifetimes, which is one of the recommended uses
-// of transmute
-
-// Make sure we can do static lifetime transmutes
-#[warn(clippy::transmute_ptr_to_ptr)]
-unsafe fn transmute_lifetime_to_static<'a, T>(t: &'a T) -> &'static T {
- std::mem::transmute::<&'a T, &'static T>(t)
-}
-
-// Make sure we can do non-static lifetime transmutes
-#[warn(clippy::transmute_ptr_to_ptr)]
-unsafe fn transmute_lifetime<'a, 'b, T>(t: &'a T, u: &'b T) -> &'b T {
- std::mem::transmute::<&'a T, &'b T>(t)
-}
-
-struct LifetimeParam<'a> {
- s: &'a str,
-}
-
-struct GenericParam<T> {
- t: T,
-}
-
-#[warn(clippy::transmute_ptr_to_ptr)]
-fn transmute_ptr_to_ptr() {
- let ptr = &1u32 as *const u32;
- let mut_ptr = &mut 1u32 as *mut u32;
- unsafe {
- // pointer-to-pointer transmutes; bad
- let _: *const f32 = std::mem::transmute(ptr);
- let _: *mut f32 = std::mem::transmute(mut_ptr);
- // ref-ref transmutes; bad
- let _: &f32 = std::mem::transmute(&1u32);
- let _: &f64 = std::mem::transmute(&1f32);
- // ^ this test is here because both f32 and f64 are the same TypeVariant, but they are not
- // the same type
- let _: &mut f32 = std::mem::transmute(&mut 1u32);
- let _: &GenericParam<f32> = std::mem::transmute(&GenericParam { t: 1u32 });
- }
-
- // these are recommendations for solving the above; if these lint we need to update
- // those suggestions
- let _ = ptr as *const f32;
- let _ = mut_ptr as *mut f32;
- let _ = unsafe { &*(&1u32 as *const u32 as *const f32) };
- let _ = unsafe { &mut *(&mut 1u32 as *mut u32 as *mut f32) };
-
- // transmute internal lifetimes, should not lint
- let s = "hello world".to_owned();
- let lp = LifetimeParam { s: &s };
- let _: &LifetimeParam<'static> = unsafe { std::mem::transmute(&lp) };
- let _: &GenericParam<&LifetimeParam<'static>> = unsafe {
- std::mem::transmute(&GenericParam { t: &lp})
- };
-}
-
-fn main() { }
+fn main() {}