diff options
Diffstat (limited to 'tests/ui/lint/reference_casting.stderr')
| -rw-r--r-- | tests/ui/lint/reference_casting.stderr | 162 |
1 files changed, 127 insertions, 35 deletions
diff --git a/tests/ui/lint/reference_casting.stderr b/tests/ui/lint/reference_casting.stderr index d5b9bbef6..7ff9b76a8 100644 --- a/tests/ui/lint/reference_casting.stderr +++ b/tests/ui/lint/reference_casting.stderr @@ -1,68 +1,160 @@ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:20:9 + --> $DIR/reference_casting.rs:19:16 | -LL | (*(a as *const _ as *mut String)).push_str(" world"); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *(num as *const i32 as *mut i32); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + | + = 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:21:16 + | +LL | let _num = &mut *(num as *const i32).cast_mut(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +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(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +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 | -note: the lint level is defined here - --> $DIR/reference_casting.rs:4:9 +LL | let _num = &mut *std::ptr::from_ref({ num }).cast_mut(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +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 | #![deny(invalid_reference_casting)] - | ^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *{ std::ptr::from_ref(num) }.cast_mut(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:22:9 + --> $DIR/reference_casting.rs:29:16 | -LL | *(a as *const _ as *mut _) = String::from("Replaced"); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *(std::ptr::from_ref({ num }) as *mut i32); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:24:9 + --> $DIR/reference_casting.rs:31:16 | -LL | *(a as *const _ as *mut String) += " world"; - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *(num as *const i32).cast::<i32>().cast_mut(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:26:25 + --> $DIR/reference_casting.rs:33:16 | -LL | let _num = &mut *(num as *const i32 as *mut i32); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *(num as *const i32).cast::<i32>().cast_mut().cast_const().cast_mut(); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:28:25 + --> $DIR/reference_casting.rs:35:16 | -LL | let _num = &mut *(num as *const i32).cast_mut(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *(std::ptr::from_ref(static_u8()) as *mut i32); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:30:20 + --> $DIR/reference_casting.rs:37:16 | -LL | let _num = *{ num as *const i32 }.cast_mut(); - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *std::mem::transmute::<_, *mut i32>(num); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:32:9 + --> $DIR/reference_casting.rs:41:16 | -LL | *std::ptr::from_ref(num).cast_mut() += 1; - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let deferred = num as *const i32 as *mut i32; + | ----------------------------- casting happend here +LL | let _num = &mut *deferred; + | ^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:34:9 + --> $DIR/reference_casting.rs:44:16 | -LL | *std::ptr::from_ref({ num }).cast_mut() += 1; - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +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; + | ^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:36:9 + --> $DIR/reference_casting.rs:46:16 | -LL | *{ std::ptr::from_ref(num) }.cast_mut() += 1; - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | let _num = &mut *(num as *const _ as usize as *mut i32); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ error: casting `&T` to `&mut T` is undefined behavior, even if the reference is unused, consider instead using an `UnsafeCell` - --> $DIR/reference_casting.rs:38:9 + --> $DIR/reference_casting.rs:50:9 + | +LL | &mut *((this as *const _) as *mut _) + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:60:5 + | +LL | *(a as *const _ as *mut _) = String::from("Replaced"); + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:62:5 + | +LL | *(a as *const _ as *mut String) += " world"; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:64:5 | -LL | *(std::ptr::from_ref({ num }) as *mut i32) += 1; - | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ +LL | *std::ptr::from_ref(num).cast_mut() += 1; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:66:5 + | +LL | *std::ptr::from_ref({ num }).cast_mut() += 1; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:68:5 + | +LL | *{ std::ptr::from_ref(num) }.cast_mut() += 1; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:70:5 + | +LL | *(std::ptr::from_ref({ num }) as *mut i32) += 1; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:72:5 + | +LL | *std::mem::transmute::<_, *mut i32>(num) += 1; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:76:5 + | +LL | let value = num as *const i32 as *mut i32; + | ----------------------------- casting happend here +LL | *value = 1; + | ^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:78:5 + | +LL | *(num as *const i32).cast::<i32>().cast_mut() = 2; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:80:5 + | +LL | *(num as *const _ as usize as *mut i32) = 2; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell` + --> $DIR/reference_casting.rs:84:9 + | +LL | *(this as *const _ as *mut _) = a; + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -error: aborting due to 10 previous errors +error: aborting due to 25 previous errors |