mirror of
https://github.com/rust-lang/rust.git
synced 2024-11-22 23:04:33 +00:00
378 lines
17 KiB
Plaintext
378 lines
17 KiB
Plaintext
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:17:16
|
|
|
|
|
LL | let _num = &mut *(num as *const i32 as *mut i32);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
= note: `#[deny(invalid_reference_casting)]` on by default
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:19:16
|
|
|
|
|
LL | let _num = &mut *(num as *const i32).cast_mut();
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:21:16
|
|
|
|
|
LL | let _num = &mut *std::ptr::from_ref(num).cast_mut();
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:23:16
|
|
|
|
|
LL | let _num = &mut *std::ptr::from_ref({ num }).cast_mut();
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:25:16
|
|
|
|
|
LL | let _num = &mut *{ std::ptr::from_ref(num) }.cast_mut();
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:27:16
|
|
|
|
|
LL | let _num = &mut *(std::ptr::from_ref({ num }) as *mut i32);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:29:16
|
|
|
|
|
LL | let _num = &mut *(num as *const i32).cast::<i32>().cast_mut();
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:31:16
|
|
|
|
|
LL | let _num = &mut *(num as *const i32).cast::<i32>().cast_mut().cast_const().cast_mut();
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:33:16
|
|
|
|
|
LL | let _num = &mut *(std::ptr::from_ref(static_u8()) as *mut i32);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:35:16
|
|
|
|
|
LL | let _num = &mut *std::mem::transmute::<_, *mut i32>(num);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:37:16
|
|
|
|
|
LL | let _num = &mut *(std::mem::transmute::<_, *mut i32>(num) as *mut i32);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:39:16
|
|
|
|
|
LL | let _num = &mut *std::cell::UnsafeCell::raw_get(
|
|
| ________________^
|
|
LL | |
|
|
LL | | num as *const i32 as *const std::cell::UnsafeCell<i32>
|
|
LL | | );
|
|
| |_____^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:45:16
|
|
|
|
|
LL | let deferred = num as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
LL | let _num = &mut *deferred;
|
|
| ^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:48:16
|
|
|
|
|
LL | let deferred = (std::ptr::from_ref(num) as *const i32 as *const i32).cast_mut() as *mut i32;
|
|
| ---------------------------------------------------------------------------- casting happend here
|
|
LL | let _num = &mut *deferred;
|
|
| ^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:51:16
|
|
|
|
|
LL | let deferred = (std::ptr::from_ref(num) as *const i32 as *const i32).cast_mut() as *mut i32;
|
|
| ---------------------------------------------------------------------------- casting happend here
|
|
...
|
|
LL | let _num = &mut *deferred_rebind;
|
|
| ^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:53:16
|
|
|
|
|
LL | let _num = &mut *(num as *const _ as usize as *mut i32);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:55:16
|
|
|
|
|
LL | let _num = &mut *(std::mem::transmute::<_, *mut _>(num as *const i32) as *mut i32);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:62:16
|
|
|
|
|
LL | let num = NUM as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
...
|
|
LL | let _num = &mut *num;
|
|
| ^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:66:16
|
|
|
|
|
LL | let _num = &mut *(cell as *const _ as *mut i32);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
= note: even for types with interior mutability, the only legal way to obtain a mutable pointer from a shared reference is through `UnsafeCell::get`
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:70:9
|
|
|
|
|
LL | &mut *((this as *const _) as *mut _)
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:75:18
|
|
|
|
|
LL | unsafe { &mut *std::cell::UnsafeCell::raw_get(x as *const _ as *const _) }
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:80:18
|
|
|
|
|
LL | unsafe { &mut *std::cell::UnsafeCell::raw_get(x as *const _ as *const _) }
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:90:5
|
|
|
|
|
LL | *(a as *const _ as *mut _) = String::from("Replaced");
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:92:5
|
|
|
|
|
LL | *(a as *const _ as *mut String) += " world";
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:94:5
|
|
|
|
|
LL | *std::ptr::from_ref(num).cast_mut() += 1;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:96:5
|
|
|
|
|
LL | *std::ptr::from_ref({ num }).cast_mut() += 1;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:98:5
|
|
|
|
|
LL | *{ std::ptr::from_ref(num) }.cast_mut() += 1;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:100:5
|
|
|
|
|
LL | *(std::ptr::from_ref({ num }) as *mut i32) += 1;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:102:5
|
|
|
|
|
LL | *std::mem::transmute::<_, *mut i32>(num) += 1;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:104:5
|
|
|
|
|
LL | *(std::mem::transmute::<_, *mut i32>(num) as *mut i32) += 1;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:106:5
|
|
|
|
|
LL | / std::ptr::write(
|
|
LL | |
|
|
LL | | std::mem::transmute::<*const i32, *mut i32>(num),
|
|
LL | | -1i32,
|
|
LL | | );
|
|
| |_____^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:111:5
|
|
|
|
|
LL | *((&std::cell::UnsafeCell::new(0)) as *const _ as *mut i32) = 5;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
= note: even for types with interior mutability, the only legal way to obtain a mutable pointer from a shared reference is through `UnsafeCell::get`
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:115:5
|
|
|
|
|
LL | let value = num as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
LL | *value = 1;
|
|
| ^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:119:5
|
|
|
|
|
LL | let value = value as *mut i32;
|
|
| ----------------- casting happend here
|
|
LL | *value = 1;
|
|
| ^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:122:5
|
|
|
|
|
LL | let value = num as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
LL | *value = 1;
|
|
| ^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:125:5
|
|
|
|
|
LL | let value = num as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
...
|
|
LL | *value_rebind = 1;
|
|
| ^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:127:5
|
|
|
|
|
LL | *(num as *const i32).cast::<i32>().cast_mut() = 2;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:129:5
|
|
|
|
|
LL | *(num as *const _ as usize as *mut i32) = 2;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:131:5
|
|
|
|
|
LL | let value = num as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
...
|
|
LL | std::ptr::write(value, 2);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:133:5
|
|
|
|
|
LL | let value = num as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
...
|
|
LL | std::ptr::write_unaligned(value, 2);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:135:5
|
|
|
|
|
LL | let value = num as *const i32 as *mut i32;
|
|
| ----------------------------- casting happend here
|
|
...
|
|
LL | std::ptr::write_volatile(value, 2);
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
|
|
--> $DIR/reference_casting.rs:139:9
|
|
|
|
|
LL | *(this as *const _ as *mut _) = a;
|
|
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
|
= note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
|
|
|
|
error: aborting due to 42 previous errors
|
|
|