151 lines
3.8 KiB
Rust
151 lines
3.8 KiB
Rust
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#![allow(dead_code)]
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extern crate core;
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use std::mem::transmute as my_transmute;
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use std::vec::Vec as MyVec;
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fn my_int() -> Usize {
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Usize(42)
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}
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fn my_vec() -> MyVec<i32> {
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vec![]
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}
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#[allow(needless_lifetimes)]
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#[warn(useless_transmute)]
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unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
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let _: &'a T = core::intrinsics::transmute(t);
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let _: &'a U = core::intrinsics::transmute(t);
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let _: *const T = core::intrinsics::transmute(t);
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let _: *mut T = core::intrinsics::transmute(t);
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let _: *const U = core::intrinsics::transmute(t);
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}
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#[warn(transmute_ptr_to_ref)]
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unsafe fn _ptr_to_ref<T, U>(p: *const T, m: *mut T, o: *const U, om: *mut U) {
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let _: &T = std::mem::transmute(p);
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let _: &T = &*p;
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let _: &mut T = std::mem::transmute(m);
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let _: &mut T = &mut *m;
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let _: &T = std::mem::transmute(m);
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let _: &T = &*m;
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let _: &mut T = std::mem::transmute(p as *mut T);
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let _ = &mut *(p as *mut T);
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let _: &T = std::mem::transmute(o);
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let _: &T = &*(o as *const T);
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let _: &mut T = std::mem::transmute(om);
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let _: &mut T = &mut *(om as *mut T);
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let _: &T = std::mem::transmute(om);
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let _: &T = &*(om as *const T);
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}
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#[warn(transmute_ptr_to_ref)]
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fn issue1231() {
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struct Foo<'a, T: 'a> {
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bar: &'a T,
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}
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let raw = 42 as *const i32;
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let _: &Foo<u8> = unsafe { std::mem::transmute::<_, &Foo<_>>(raw) };
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let _: &Foo<&u8> = unsafe { std::mem::transmute::<_, &Foo<&_>>(raw) };
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type Bar<'a> = &'a u8;
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let raw = 42 as *const i32;
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unsafe { std::mem::transmute::<_, Bar>(raw) };
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}
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#[warn(useless_transmute)]
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fn useless() {
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unsafe {
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let _: Vec<i32> = core::intrinsics::transmute(my_vec());
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let _: Vec<i32> = core::mem::transmute(my_vec());
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let _: Vec<i32> = std::intrinsics::transmute(my_vec());
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let _: Vec<i32> = std::mem::transmute(my_vec());
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let _: Vec<i32> = my_transmute(my_vec());
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let _: Vec<u32> = core::intrinsics::transmute(my_vec());
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let _: Vec<u32> = core::mem::transmute(my_vec());
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let _: Vec<u32> = std::intrinsics::transmute(my_vec());
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let _: Vec<u32> = std::mem::transmute(my_vec());
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let _: Vec<u32> = my_transmute(my_vec());
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let _: *const usize = std::mem::transmute(5_isize);
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let _ = 5_isize as *const usize;
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let _: *const usize = std::mem::transmute(1+1usize);
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let _ = (1+1_usize) as *const usize;
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}
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}
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struct Usize(usize);
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#[warn(crosspointer_transmute)]
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fn crosspointer() {
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let mut int: Usize = Usize(0);
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let int_const_ptr: *const Usize = &int as *const Usize;
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let int_mut_ptr: *mut Usize = &mut int as *mut Usize;
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unsafe {
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let _: Usize = core::intrinsics::transmute(int_const_ptr);
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let _: Usize = core::intrinsics::transmute(int_mut_ptr);
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let _: *const Usize = core::intrinsics::transmute(my_int());
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let _: *mut Usize = core::intrinsics::transmute(my_int());
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}
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}
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#[warn(transmute_int_to_char)]
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fn int_to_char() {
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let _: char = unsafe { std::mem::transmute(0_u32) };
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let _: char = unsafe { std::mem::transmute(0_i32) };
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}
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#[warn(transmute_int_to_bool)]
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fn int_to_bool() {
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let _: bool = unsafe { std::mem::transmute(0_u8) };
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}
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#[warn(transmute_int_to_float)]
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fn int_to_float() {
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let _: f32 = unsafe { std::mem::transmute(0_u32) };
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let _: f32 = unsafe { std::mem::transmute(0_i32) };
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}
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fn bytes_to_str(b: &[u8], mb: &mut [u8]) {
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let _: &str = unsafe { std::mem::transmute(b) };
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let _: &mut str = unsafe { std::mem::transmute(mb) };
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}
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#[warn(misaligned_transmute)]
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fn misaligned_transmute() {
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let _: u32 = unsafe { std::mem::transmute([0u8; 4]) }; // err
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let _: u32 = unsafe { std::mem::transmute(0f32) }; // ok (alignment-wise)
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let _: [u8; 4] = unsafe { std::mem::transmute(0u32) }; // ok (alignment-wise)
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}
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fn main() { }
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