2018-10-06 11:18:06 -05:00
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// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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2018-10-11 05:16:22 -05:00
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2017-09-18 05:47:33 -05:00
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2015-11-11 08:28:31 -06:00
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2016-09-19 10:59:12 -05:00
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#![allow(dead_code)]
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2015-11-11 08:28:31 -06:00
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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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2016-06-28 07:08:08 -05:00
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fn my_int() -> Usize {
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Usize(42)
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2016-04-07 10:46:48 -05:00
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}
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2015-11-11 08:28:31 -06:00
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fn my_vec() -> MyVec<i32> {
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vec![]
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}
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2018-07-28 10:34:52 -05:00
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#[allow(clippy::needless_lifetimes, clippy::transmute_ptr_to_ptr)]
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#[warn(clippy::useless_transmute)]
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2015-11-11 08:28:31 -06:00
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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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2017-02-08 07:58:07 -06:00
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2015-11-11 08:28:31 -06:00
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let _: &'a U = core::intrinsics::transmute(t);
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2016-06-27 09:12:48 -05:00
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let _: *const T = core::intrinsics::transmute(t);
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2017-02-08 07:58:07 -06:00
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2016-06-27 09:12:48 -05:00
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let _: *mut T = core::intrinsics::transmute(t);
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2017-02-08 07:58:07 -06:00
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2016-06-27 09:12:48 -05:00
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let _: *const U = core::intrinsics::transmute(t);
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2015-11-11 08:28:31 -06:00
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}
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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_ptr_to_ref)]
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2016-03-25 17:22:17 -05:00
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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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2016-06-28 01:48:44 -05:00
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let _: &mut T = std::mem::transmute(p as *mut T);
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2016-06-29 16:02:15 -05:00
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let _ = &mut *(p as *mut T);
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2016-06-28 01:48:44 -05:00
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2016-03-25 17:22:17 -05:00
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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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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_ptr_to_ref)]
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2016-09-19 10:59:12 -05:00
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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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2017-02-20 21:36:59 -06:00
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let raw = 42 as *const i32;
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2016-09-19 10:59:12 -05:00
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let _: &Foo<u8> = unsafe { std::mem::transmute::<_, &Foo<_>>(raw) };
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2017-02-08 07:58:07 -06:00
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2016-09-19 10:59:12 -05:00
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let _: &Foo<&u8> = unsafe { std::mem::transmute::<_, &Foo<&_>>(raw) };
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2017-02-08 07:58:07 -06:00
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2016-09-19 10:59:12 -05:00
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type Bar<'a> = &'a u8;
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2017-02-20 21:36:59 -06:00
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let raw = 42 as *const i32;
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2016-09-19 10:59:12 -05:00
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unsafe { std::mem::transmute::<_, Bar>(raw) };
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}
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2018-07-28 10:34:52 -05:00
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#[warn(clippy::useless_transmute)]
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2016-03-24 17:48:38 -05:00
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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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2017-02-08 07:58:07 -06:00
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2015-11-11 08:28:31 -06:00
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let _: Vec<i32> = core::mem::transmute(my_vec());
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2017-02-08 07:58:07 -06:00
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2015-11-11 08:28:31 -06:00
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let _: Vec<i32> = std::intrinsics::transmute(my_vec());
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2017-02-08 07:58:07 -06:00
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2015-11-11 08:28:31 -06:00
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let _: Vec<i32> = std::mem::transmute(my_vec());
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2017-02-08 07:58:07 -06:00
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2015-11-11 08:28:31 -06:00
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let _: Vec<i32> = my_transmute(my_vec());
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2017-02-08 07:58:07 -06:00
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2015-11-11 08:28:31 -06:00
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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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2016-06-28 07:08:08 -05:00
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let _: *const usize = std::mem::transmute(5_isize);
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2017-02-08 07:58:07 -06:00
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2016-07-03 19:22:57 -05:00
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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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2017-02-08 07:58:07 -06:00
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2016-07-03 19:22:57 -05:00
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let _ = (1+1_usize) as *const usize;
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2015-11-11 08:28:31 -06:00
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}
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}
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2016-03-24 17:48:38 -05:00
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2016-06-28 07:08:08 -05:00
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struct Usize(usize);
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2018-07-28 10:34:52 -05:00
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#[warn(clippy::crosspointer_transmute)]
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2016-03-24 17:48:38 -05:00
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fn crosspointer() {
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2016-06-28 07:08:08 -05:00
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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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2016-03-24 17:48:38 -05:00
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unsafe {
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2016-06-28 07:08:08 -05:00
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let _: Usize = core::intrinsics::transmute(int_const_ptr);
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2017-02-08 07:58:07 -06:00
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2016-06-28 07:08:08 -05:00
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let _: Usize = core::intrinsics::transmute(int_mut_ptr);
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2017-02-08 07:58:07 -06:00
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2016-06-28 07:08:08 -05:00
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let _: *const Usize = core::intrinsics::transmute(my_int());
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2017-02-08 07:58:07 -06:00
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2016-06-28 07:08:08 -05:00
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let _: *mut Usize = core::intrinsics::transmute(my_int());
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2016-03-24 17:48:38 -05:00
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}
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}
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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_int_to_char)]
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2017-10-02 10:23:24 -05:00
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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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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_int_to_bool)]
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2017-10-02 10:23:24 -05:00
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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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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_int_to_float)]
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2017-10-02 10:23:24 -05:00
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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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2017-10-28 20:27:45 -05:00
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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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2018-05-22 19:18:56 -05:00
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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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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_ptr_to_ptr)]
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2018-05-22 19:18:56 -05:00
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unsafe fn transmute_lifetime_to_static<'a, T>(t: &'a T) -> &'static T {
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std::mem::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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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_ptr_to_ptr)]
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2018-05-22 19:18:56 -05:00
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unsafe fn transmute_lifetime<'a, 'b, T>(t: &'a T, u: &'b T) -> &'b T {
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std::mem::transmute::<&'a T, &'b T>(t)
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}
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2018-05-24 22:02:42 -05:00
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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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2018-07-28 10:34:52 -05:00
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#[warn(clippy::transmute_ptr_to_ptr)]
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2018-04-11 04:17:59 -05:00
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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 = std::mem::transmute(ptr);
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let _: *mut f32 = std::mem::transmute(mut_ptr);
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// ref-ref transmutes; bad
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let _: &f32 = std::mem::transmute(&1u32);
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2018-05-24 22:02:42 -05:00
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let _: &f64 = std::mem::transmute(&1f32);
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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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2018-04-11 04:17:59 -05:00
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let _: &mut f32 = std::mem::transmute(&mut 1u32);
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2018-05-24 22:02:42 -05:00
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let _: &GenericParam<f32> = std::mem::transmute(&GenericParam { t: 1u32 });
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2018-04-11 04:17:59 -05:00
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}
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2018-05-24 22:02:42 -05:00
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// these are recommendations for solving the above; if these lint we need to update
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2018-05-14 12:24:31 -05:00
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// those suggestions
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2018-04-11 04:17:59 -05:00
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let _ = ptr as *const f32;
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let _ = mut_ptr as *mut f32;
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let _ = unsafe { &*(&1u32 as *const u32 as *const f32) };
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let _ = unsafe { &mut *(&mut 1u32 as *mut u32 as *mut f32) };
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2018-05-24 22:02:42 -05:00
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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 { std::mem::transmute(&lp) };
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let _: &GenericParam<&LifetimeParam<'static>> = unsafe {
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std::mem::transmute(&GenericParam { t: &lp})
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};
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2018-04-11 04:17:59 -05:00
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}
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2016-09-19 10:59:12 -05:00
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fn main() { }
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