blob: 1cbacf0feab543bdf3df61bc270965713d747d76 (
plain)
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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
|
#![allow(dead_code, clippy::borrow_as_ptr, clippy::needless_lifetimes)]
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) {
// FIXME: should lint
// let _: &'a T = core::intrinsics::transmute(t);
let _: &'a U = core::intrinsics::transmute(t);
let _: *const T = core::intrinsics::transmute(t);
let _: *mut T = core::intrinsics::transmute(t);
let _: *const U = core::intrinsics::transmute(t);
}
#[warn(clippy::useless_transmute)]
fn useless() {
unsafe {
let _: Vec<i32> = core::intrinsics::transmute(my_vec());
let _: Vec<i32> = core::mem::transmute(my_vec());
let _: Vec<i32> = std::intrinsics::transmute(my_vec());
let _: Vec<i32> = std::mem::transmute(my_vec());
let _: Vec<i32> = my_transmute(my_vec());
let _: *const usize = std::mem::transmute(5_isize);
let _ = 5_isize as *const usize;
let _: *const usize = std::mem::transmute(1 + 1usize);
let _ = (1 + 1_usize) as *const usize;
}
unsafe fn _f<'a, 'b>(x: &'a u32) -> &'b u32 {
std::mem::transmute(x)
}
unsafe fn _f2<'a, 'b>(x: *const (dyn Iterator<Item = u32> + 'a)) -> *const (dyn Iterator<Item = u32> + 'b) {
std::mem::transmute(x)
}
unsafe fn _f3<'a, 'b>(x: fn(&'a u32)) -> fn(&'b u32) {
std::mem::transmute(x)
}
unsafe fn _f4<'a, 'b>(x: std::borrow::Cow<'a, str>) -> std::borrow::Cow<'b, str> {
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::intrinsics::transmute(int_const_ptr);
let _: Usize = core::intrinsics::transmute(int_mut_ptr);
let _: *const Usize = core::intrinsics::transmute(my_int());
let _: *mut Usize = core::intrinsics::transmute(my_int());
}
}
#[warn(clippy::transmute_int_to_char)]
fn int_to_char() {
let _: char = unsafe { std::mem::transmute(0_u32) };
let _: char = unsafe { std::mem::transmute(0_i32) };
// These shouldn't warn
const _: char = unsafe { std::mem::transmute(0_u32) };
const _: char = unsafe { std::mem::transmute(0_i32) };
}
#[warn(clippy::transmute_int_to_bool)]
fn int_to_bool() {
let _: bool = unsafe { std::mem::transmute(0_u8) };
}
#[warn(clippy::transmute_int_to_float)]
mod int_to_float {
fn test() {
let _: f32 = unsafe { std::mem::transmute(0_u32) };
let _: f32 = unsafe { std::mem::transmute(0_i32) };
let _: f64 = unsafe { std::mem::transmute(0_u64) };
let _: f64 = unsafe { std::mem::transmute(0_i64) };
}
mod issue_5747 {
const VALUE32: f32 = unsafe { std::mem::transmute(0_u32) };
const VALUE64: f64 = unsafe { std::mem::transmute(0_i64) };
const fn from_bits_32(v: i32) -> f32 {
unsafe { std::mem::transmute(v) }
}
const fn from_bits_64(v: u64) -> f64 {
unsafe { std::mem::transmute(v) }
}
}
}
mod num_to_bytes {
fn test() {
unsafe {
let _: [u8; 1] = std::mem::transmute(0u8);
let _: [u8; 4] = std::mem::transmute(0u32);
let _: [u8; 16] = std::mem::transmute(0u128);
let _: [u8; 1] = std::mem::transmute(0i8);
let _: [u8; 4] = std::mem::transmute(0i32);
let _: [u8; 16] = std::mem::transmute(0i128);
let _: [u8; 4] = std::mem::transmute(0.0f32);
let _: [u8; 8] = std::mem::transmute(0.0f64);
}
}
const fn test_const() {
unsafe {
let _: [u8; 1] = std::mem::transmute(0u8);
let _: [u8; 4] = std::mem::transmute(0u32);
let _: [u8; 16] = std::mem::transmute(0u128);
let _: [u8; 1] = std::mem::transmute(0i8);
let _: [u8; 4] = std::mem::transmute(0i32);
let _: [u8; 16] = std::mem::transmute(0i128);
let _: [u8; 4] = std::mem::transmute(0.0f32);
let _: [u8; 8] = std::mem::transmute(0.0f64);
}
}
}
fn bytes_to_str(mb: &mut [u8]) {
const B: &[u8] = b"";
let _: &str = unsafe { std::mem::transmute(B) };
let _: &mut str = unsafe { std::mem::transmute(mb) };
const _: &str = unsafe { std::mem::transmute(B) };
}
fn main() {}
|
