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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:02:58 +0000 |
commit | 698f8c2f01ea549d77d7dc3338a12e04c11057b9 (patch) | |
tree | 173a775858bd501c378080a10dca74132f05bc50 /src/test/ui/consts/const-eval/ub-ref-ptr.rs | |
parent | Initial commit. (diff) | |
download | rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.tar.xz rustc-698f8c2f01ea549d77d7dc3338a12e04c11057b9.zip |
Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/test/ui/consts/const-eval/ub-ref-ptr.rs')
-rw-r--r-- | src/test/ui/consts/const-eval/ub-ref-ptr.rs | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/src/test/ui/consts/const-eval/ub-ref-ptr.rs b/src/test/ui/consts/const-eval/ub-ref-ptr.rs new file mode 100644 index 000000000..d0216f746 --- /dev/null +++ b/src/test/ui/consts/const-eval/ub-ref-ptr.rs @@ -0,0 +1,65 @@ +// ignore-tidy-linelength +// stderr-per-bitwidth +#![allow(invalid_value)] + +use std::mem; + +#[repr(C)] +union MaybeUninit<T: Copy> { + uninit: (), + init: T, +} + +const UNALIGNED: &u16 = unsafe { mem::transmute(&[0u8; 4]) }; +//~^ ERROR it is undefined behavior to use this value +//~| constructing invalid value: encountered an unaligned reference (required 2 byte alignment but found 1) + +const UNALIGNED_BOX: Box<u16> = unsafe { mem::transmute(&[0u8; 4]) }; +//~^ ERROR it is undefined behavior to use this value +//~| constructing invalid value: encountered an unaligned box (required 2 byte alignment but found 1) + +const NULL: &u16 = unsafe { mem::transmute(0usize) }; +//~^ ERROR it is undefined behavior to use this value + +const NULL_BOX: Box<u16> = unsafe { mem::transmute(0usize) }; +//~^ ERROR it is undefined behavior to use this value + + +// It is very important that we reject this: We do promote `&(4 * REF_AS_USIZE)`, +// but that would fail to compile; so we ended up breaking user code that would +// have worked fine had we not promoted. +const REF_AS_USIZE: usize = unsafe { mem::transmute(&0) }; +//~^ ERROR any use of this value will cause an error +//~| WARN this was previously accepted by the compiler but is being phased out + +const REF_AS_USIZE_SLICE: &[usize] = &[unsafe { mem::transmute(&0) }]; +//~^ ERROR any use of this value will cause an error +//~| WARN this was previously accepted by the compiler but is being phased out +//~| ERROR any use of this value will cause an error +//~| WARN this was previously accepted by the compiler but is being phased out + +const REF_AS_USIZE_BOX_SLICE: Box<[usize]> = unsafe { mem::transmute::<&[usize], _>(&[mem::transmute(&0)]) }; +//~^ ERROR any use of this value will cause an error +//~| WARN this was previously accepted by the compiler but is being phased out +//~| ERROR any use of this value will cause an error +//~| WARN this was previously accepted by the compiler but is being phased out + +const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) }; +//~^ ERROR it is undefined behavior to use this value + +const USIZE_AS_BOX: Box<u8> = unsafe { mem::transmute(1337usize) }; +//~^ ERROR it is undefined behavior to use this value + +const UNINIT_PTR: *const i32 = unsafe { MaybeUninit { uninit: () }.init }; +//~^ ERROR it is undefined behavior to use this value + +const NULL_FN_PTR: fn() = unsafe { mem::transmute(0usize) }; +//~^ ERROR it is undefined behavior to use this value +const UNINIT_FN_PTR: fn() = unsafe { MaybeUninit { uninit: () }.init }; +//~^ ERROR it is undefined behavior to use this value +const DANGLING_FN_PTR: fn() = unsafe { mem::transmute(13usize) }; +//~^ ERROR it is undefined behavior to use this value +const DATA_FN_PTR: fn() = unsafe { mem::transmute(&13) }; +//~^ ERROR it is undefined behavior to use this value + +fn main() {} |