259 lines
10 KiB
Rust
259 lines
10 KiB
Rust
#![warn(clippy::transmute_undefined_repr)]
|
|
#![allow(
|
|
clippy::unit_arg,
|
|
clippy::transmute_ptr_to_ref,
|
|
clippy::useless_transmute,
|
|
clippy::missing_transmute_annotations
|
|
)]
|
|
|
|
use core::any::TypeId;
|
|
use core::ffi::c_void;
|
|
use core::mem::{MaybeUninit, size_of, transmute};
|
|
use core::ptr::NonNull;
|
|
|
|
fn value<T>() -> T {
|
|
unimplemented!()
|
|
}
|
|
|
|
struct Empty;
|
|
struct Ty<T>(T);
|
|
struct Ty2<T, U>(T, U);
|
|
|
|
#[repr(C)]
|
|
struct Ty2C<T, U>(T, U);
|
|
|
|
fn main() {
|
|
unsafe {
|
|
let _: () = transmute(value::<Empty>());
|
|
let _: Empty = transmute(value::<()>());
|
|
|
|
let _: Ty<u32> = transmute(value::<u32>());
|
|
let _: Ty<u32> = transmute(value::<u32>());
|
|
|
|
// Lint, Ty2 is unordered
|
|
let _: Ty2C<u32, i32> = transmute(value::<Ty2<u32, i32>>());
|
|
//~^ ERROR: transmute from `Ty2<u32, i32>` which has an undefined layout
|
|
//~| NOTE: `-D clippy::transmute-undefined-repr` implied by `-D warnings`
|
|
// Lint, Ty2 is unordered
|
|
let _: Ty2<u32, i32> = transmute(value::<Ty2C<u32, i32>>());
|
|
//~^ ERROR: transmute into `Ty2<u32, i32>` which has an undefined layout
|
|
|
|
// Ok, Ty2 types are the same
|
|
let _: Ty2<u32, i32> = transmute(value::<Ty<Ty2<u32, i32>>>());
|
|
// Ok, Ty2 types are the same
|
|
let _: Ty<Ty2<u32, i32>> = transmute(value::<Ty2<u32, i32>>());
|
|
|
|
// Lint, different Ty2 instances
|
|
let _: Ty2<u32, f32> = transmute(value::<Ty<Ty2<u32, i32>>>());
|
|
//~^ ERROR: transmute from `Ty<Ty2<u32, i32>>` to `Ty2<u32, f32>`, both of which h
|
|
//~| NOTE: two instances of the same generic type (`Ty2`) may have different layou
|
|
// Lint, different Ty2 instances
|
|
let _: Ty<Ty2<u32, i32>> = transmute(value::<Ty2<u32, f32>>());
|
|
//~^ ERROR: transmute from `Ty2<u32, f32>` to `Ty<Ty2<u32, i32>>`, both of which h
|
|
//~| NOTE: two instances of the same generic type (`Ty2`) may have different layou
|
|
|
|
let _: Ty<&()> = transmute(value::<&()>());
|
|
let _: &() = transmute(value::<Ty<&()>>());
|
|
|
|
// Lint, different Ty2 instances
|
|
let _: &Ty2<u32, f32> = transmute(value::<Ty<&Ty2<u32, i32>>>());
|
|
//~^ ERROR: transmute from `Ty<&Ty2<u32, i32>>` to `&Ty2<u32, f32>`, both of which
|
|
//~| NOTE: two instances of the same generic type (`Ty2`) may have different layou
|
|
// Lint, different Ty2 instances
|
|
let _: Ty<&Ty2<u32, i32>> = transmute(value::<&Ty2<u32, f32>>());
|
|
//~^ ERROR: transmute from `&Ty2<u32, f32>` to `Ty<&Ty2<u32, i32>>`, both of which
|
|
//~| NOTE: two instances of the same generic type (`Ty2`) may have different layou
|
|
|
|
// Ok, pointer to usize conversion
|
|
let _: Ty<usize> = transmute(value::<&Ty2<u32, i32>>());
|
|
// Ok, pointer to usize conversion
|
|
let _: &Ty2<u32, i32> = transmute(value::<Ty<usize>>());
|
|
|
|
// Ok, transmute to byte array
|
|
let _: Ty<[u8; 8]> = transmute(value::<Ty2<u32, i32>>());
|
|
// Ok, transmute from byte array
|
|
let _: Ty2<u32, i32> = transmute(value::<Ty<[u8; 8]>>());
|
|
|
|
// issue #8417
|
|
// Ok, Ty2 types are the same
|
|
let _: Ty2C<Ty2<u32, i32>, ()> = transmute(value::<Ty2<u32, i32>>());
|
|
// Ok, Ty2 types are the same
|
|
let _: Ty2<u32, i32> = transmute(value::<Ty2C<Ty2<u32, i32>, ()>>());
|
|
|
|
// Ok, Ty2 types are the same
|
|
let _: &'static mut Ty2<u32, u32> = transmute(value::<Box<Ty2<u32, u32>>>());
|
|
// Ok, Ty2 types are the same
|
|
let _: Box<Ty2<u32, u32>> = transmute(value::<&'static mut Ty2<u32, u32>>());
|
|
// Ok, Ty2 types are the same
|
|
let _: *mut Ty2<u32, u32> = transmute(value::<Box<Ty2<u32, u32>>>());
|
|
// Ok, Ty2 types are the same
|
|
let _: Box<Ty2<u32, u32>> = transmute(value::<*mut Ty2<u32, u32>>());
|
|
|
|
// Lint, different Ty2 instances
|
|
let _: &'static mut Ty2<u32, f32> = transmute(value::<Box<Ty2<u32, u32>>>());
|
|
//~^ ERROR: transmute from `std::boxed::Box<Ty2<u32, u32>>` to `&mut Ty2<u32, f32>
|
|
//~| NOTE: two instances of the same generic type (`Ty2`) may have different layou
|
|
// Lint, different Ty2 instances
|
|
let _: Box<Ty2<u32, u32>> = transmute(value::<&'static mut Ty2<u32, f32>>());
|
|
//~^ ERROR: transmute from `&mut Ty2<u32, f32>` to `std::boxed::Box<Ty2<u32, u32>>
|
|
//~| NOTE: two instances of the same generic type (`Ty2`) may have different layou
|
|
|
|
// Ok, type erasure
|
|
let _: *const () = transmute(value::<Ty<&Ty2<u32, f32>>>());
|
|
// Ok, reverse type erasure
|
|
let _: Ty<&Ty2<u32, f32>> = transmute(value::<*const ()>());
|
|
|
|
// Ok, type erasure
|
|
let _: *const c_void = transmute(value::<Ty<&Ty2<u32, f32>>>());
|
|
// Ok, reverse type erasure
|
|
let _: Ty<&Ty2<u32, f32>> = transmute(value::<*const c_void>());
|
|
|
|
enum Erase {}
|
|
// Ok, type erasure
|
|
let _: *const Erase = transmute(value::<Ty<&Ty2<u32, f32>>>());
|
|
// Ok, reverse type erasure
|
|
let _: Ty<&Ty2<u32, f32>> = transmute(value::<*const Erase>());
|
|
|
|
struct Erase2(
|
|
[u8; 0],
|
|
core::marker::PhantomData<(*mut u8, core::marker::PhantomPinned)>,
|
|
);
|
|
// Ok, type erasure
|
|
let _: *const Erase2 = transmute(value::<Ty<&Ty2<u32, f32>>>());
|
|
// Ok, reverse type erasure
|
|
let _: Ty<&Ty2<u32, f32>> = transmute(value::<*const Erase2>());
|
|
|
|
// Ok, type erasure
|
|
let _: *const () = transmute(value::<&&[u8]>());
|
|
// Ok, reverse type erasure
|
|
let _: &&[u8] = transmute(value::<*const ()>());
|
|
|
|
// Ok, type erasure
|
|
let _: *mut c_void = transmute(value::<&mut &[u8]>());
|
|
// Ok, reverse type erasure
|
|
let _: &mut &[u8] = transmute(value::<*mut c_void>());
|
|
|
|
// Ok, transmute to byte array
|
|
let _: [u8; size_of::<&[u8]>()] = transmute(value::<&[u8]>());
|
|
// Ok, transmute from byte array
|
|
let _: &[u8] = transmute(value::<[u8; size_of::<&[u8]>()]>());
|
|
|
|
// Ok, transmute to int array
|
|
let _: [usize; 2] = transmute(value::<&[u8]>());
|
|
// Ok, transmute from int array
|
|
let _: &[u8] = transmute(value::<[usize; 2]>());
|
|
|
|
// Ok
|
|
let _: *const [u8] = transmute(value::<Box<[u8]>>());
|
|
// Ok
|
|
let _: Box<[u8]> = transmute(value::<*mut [u8]>());
|
|
|
|
// Ok
|
|
let _: Ty2<u32, u32> = transmute(value::<(Ty2<u32, u32>,)>());
|
|
// Ok
|
|
let _: (Ty2<u32, u32>,) = transmute(value::<Ty2<u32, u32>>());
|
|
|
|
// Ok
|
|
let _: Ty2<u32, u32> = transmute(value::<(Ty2<u32, u32>, ())>());
|
|
// Ok
|
|
let _: (Ty2<u32, u32>, ()) = transmute(value::<Ty2<u32, u32>>());
|
|
|
|
// Ok
|
|
let _: Ty2<u32, u32> = transmute(value::<((), Ty2<u32, u32>)>());
|
|
// Ok
|
|
let _: ((), Ty2<u32, u32>) = transmute(value::<Ty2<u32, u32>>());
|
|
|
|
// Ok
|
|
let _: (usize, usize) = transmute(value::<&[u8]>());
|
|
// Ok
|
|
let _: &[u8] = transmute(value::<(usize, usize)>());
|
|
|
|
trait Trait {}
|
|
// Ok
|
|
let _: (isize, isize) = transmute(value::<&dyn Trait>());
|
|
let _: &dyn Trait = transmute(value::<(isize, isize)>());
|
|
|
|
// Ok
|
|
let _: MaybeUninit<Ty2<u32, u32>> = transmute(value::<Ty2<u32, u32>>());
|
|
// Ok
|
|
let _: Ty2<u32, u32> = transmute(value::<MaybeUninit<Ty2<u32, u32>>>());
|
|
|
|
// Ok
|
|
let _: Ty<&[u32]> = transmute::<&[u32], _>(value::<&Vec<u32>>());
|
|
|
|
// Ok
|
|
let _: *const Ty2<u32, u32> = transmute(value::<*const Ty2C<Ty2<u32, u32>, u32>>());
|
|
// Ok
|
|
let _: *const Ty2C<Ty2<u32, u32>, u32> = transmute(value::<*const Ty2<u32, u32>>());
|
|
// Ok
|
|
let _: *const Ty2<u32, u32> = transmute(value::<*const Ty2C<(), Ty2<u32, u32>>>());
|
|
// Ok
|
|
let _: *const Ty2C<(), Ty2<u32, u32>> = transmute(value::<*const Ty2<u32, u32>>());
|
|
|
|
// Err
|
|
let _: *const Ty2<u32, u32> = transmute(value::<*const Ty2C<u32, Ty2<u32, u32>>>());
|
|
//~^ ERROR: transmute into `*const Ty2<u32, u32>` which has an undefined layout
|
|
//~| NOTE: the contained type `Ty2<u32, u32>` has an undefined layout
|
|
// Err
|
|
let _: *const Ty2C<u32, Ty2<u32, u32>> = transmute(value::<*const Ty2<u32, u32>>());
|
|
//~^ ERROR: transmute from `*const Ty2<u32, u32>` which has an undefined layout
|
|
//~| NOTE: the contained type `Ty2<u32, u32>` has an undefined layout
|
|
|
|
// Ok
|
|
let _: NonNull<u8> = transmute(value::<NonNull<(String, String)>>());
|
|
// Ok
|
|
let _: NonNull<(String, String)> = transmute(value::<NonNull<u8>>());
|
|
}
|
|
}
|
|
|
|
fn _with_generics<T: 'static, U: 'static>() {
|
|
if TypeId::of::<T>() != TypeId::of::<u32>() || TypeId::of::<T>() != TypeId::of::<U>() {
|
|
return;
|
|
}
|
|
unsafe {
|
|
// Ok
|
|
let _: &u32 = transmute(value::<&T>());
|
|
// Ok
|
|
let _: &T = transmute(value::<&u32>());
|
|
|
|
// Ok
|
|
let _: Vec<U> = transmute(value::<Vec<T>>());
|
|
// Ok
|
|
let _: Vec<T> = transmute(value::<Vec<U>>());
|
|
|
|
// Ok
|
|
let _: Ty<&u32> = transmute(value::<&T>());
|
|
// Ok
|
|
let _: Ty<&T> = transmute(value::<&u32>());
|
|
|
|
// Ok
|
|
let _: Vec<u32> = transmute(value::<Vec<T>>());
|
|
// Ok
|
|
let _: Vec<T> = transmute(value::<Vec<u32>>());
|
|
|
|
// Ok
|
|
let _: &Ty2<u32, u32> = transmute(value::<&Ty2<T, U>>());
|
|
// Ok
|
|
let _: &Ty2<T, U> = transmute(value::<&Ty2<u32, u32>>());
|
|
|
|
// Ok
|
|
let _: Vec<Vec<u32>> = transmute(value::<Vec<Vec<T>>>());
|
|
// Ok
|
|
let _: Vec<Vec<T>> = transmute(value::<Vec<Vec<u32>>>());
|
|
|
|
// Err
|
|
let _: Vec<Ty2<T, u32>> = transmute(value::<Vec<Ty2<U, i32>>>());
|
|
//~^ ERROR: transmute from `std::vec::Vec<Ty2<U, i32>>` to `std::vec::Vec<Ty2<T, u
|
|
//~| NOTE: two instances of the same generic type (`Vec`) may have different layou
|
|
// Err
|
|
let _: Vec<Ty2<U, i32>> = transmute(value::<Vec<Ty2<T, u32>>>());
|
|
//~^ ERROR: transmute from `std::vec::Vec<Ty2<T, u32>>` to `std::vec::Vec<Ty2<U, i
|
|
//~| NOTE: two instances of the same generic type (`Vec`) may have different layou
|
|
|
|
// Ok
|
|
let _: *const u32 = transmute(value::<Box<T>>());
|
|
// Ok
|
|
let _: Box<T> = transmute(value::<*const u32>());
|
|
}
|
|
}
|