1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
#![feature(f128)]
#![feature(f16)]
#![allow(
dead_code,
clippy::borrow_as_ptr,
unnecessary_transmutes,
clippy::needless_lifetimes,
clippy::missing_transmute_annotations
)]
//@no-rustfix
extern crate core;
use std::mem::transmute as my_transmute;
use std::vec::Vec as MyVec;
fn my_int() -> Usize {
Usize(42)
}
fn my_vec() -> MyVec<i32> {
vec![]
}
#[allow(clippy::needless_lifetimes, clippy::transmute_ptr_to_ptr)]
#[warn(clippy::useless_transmute)]
unsafe fn _generic<'a, T, U: 'a>(t: &'a T) {
unsafe {
// FIXME: should lint
// let _: &'a T = core::mem::transmute(t);
let _: &'a U = core::mem::transmute(t);
let _: *const T = core::mem::transmute(t);
//~^ useless_transmute
let _: *mut T = core::mem::transmute(t);
//~^ useless_transmute
let _: *const U = core::mem::transmute(t);
//~^ useless_transmute
}
}
#[warn(clippy::useless_transmute)]
fn useless() {
unsafe {
let _: Vec<i32> = core::mem::transmute(my_vec());
//~^ useless_transmute
let _: Vec<i32> = core::mem::transmute(my_vec());
//~^ useless_transmute
let _: Vec<i32> = std::mem::transmute(my_vec());
//~^ useless_transmute
let _: Vec<i32> = std::mem::transmute(my_vec());
//~^ useless_transmute
let _: Vec<i32> = my_transmute(my_vec());
//~^ useless_transmute
let _: *const usize = std::mem::transmute(5_isize);
//~^ useless_transmute
let _ = std::ptr::dangling::<usize>();
let _: *const usize = std::mem::transmute(1 + 1usize);
//~^ useless_transmute
let _ = (1 + 1_usize) as *const usize;
}
unsafe fn _f<'a, 'b>(x: &'a u32) -> &'b u32 {
unsafe { std::mem::transmute(x) }
}
unsafe fn _f2<'a, 'b>(x: *const (dyn Iterator<Item = u32> + 'a)) -> *const (dyn Iterator<Item = u32> + 'b) {
unsafe { std::mem::transmute(x) }
}
unsafe fn _f3<'a, 'b>(x: fn(&'a u32)) -> fn(&'b u32) {
unsafe { std::mem::transmute(x) }
}
unsafe fn _f4<'a, 'b>(x: std::borrow::Cow<'a, str>) -> std::borrow::Cow<'b, str> {
unsafe { std::mem::transmute(x) }
}
}
struct Usize(usize);
#[warn(clippy::crosspointer_transmute)]
fn crosspointer() {
let mut int: Usize = Usize(0);
let int_const_ptr: *const Usize = &int as *const Usize;
let int_mut_ptr: *mut Usize = &mut int as *mut Usize;
unsafe {
let _: Usize = core::mem::transmute(int_const_ptr);
//~^ crosspointer_transmute
let _: Usize = core::mem::transmute(int_mut_ptr);
//~^ crosspointer_transmute
let _: *const Usize = core::mem::transmute(my_int());
//~^ crosspointer_transmute
let _: *mut Usize = core::mem::transmute(my_int());
//~^ crosspointer_transmute
}
}
#[warn(clippy::transmute_int_to_bool)]
fn int_to_bool() {
let _: bool = unsafe { std::mem::transmute(0_u8) };
//~^ transmute_int_to_bool
}
fn bytes_to_str(mb: &mut [u8]) {
const B: &[u8] = b"";
let _: &str = unsafe { std::mem::transmute(B) };
//~^ transmute_bytes_to_str
let _: &mut str = unsafe { std::mem::transmute(mb) };
//~^ transmute_bytes_to_str
const _: &str = unsafe { std::mem::transmute(B) };
//~^ transmute_bytes_to_str
}
fn main() {}
|
