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163 lines
6.8 KiB
Rust
163 lines
6.8 KiB
Rust
// ignore-tidy-linelength
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#![allow(unused)]
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#![feature(ptr_metadata)]
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use std::{ptr, mem};
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// Strip out raw byte dumps to make comparison platform-independent:
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//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
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//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼ )+ *│.*" -> "HEX_DUMP"
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//@ normalize-stderr-test "offset \d+" -> "offset N"
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//@ normalize-stderr-test "size \d+" -> "size N"
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/// A newtype wrapper to prevent MIR generation from inserting reborrows that would affect the error
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/// message.
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#[repr(transparent)]
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struct W<T>(T);
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#[repr(C)]
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union MaybeUninit<T: Copy> {
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uninit: (),
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init: T,
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}
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trait Trait {}
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impl Trait for bool {}
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// custom unsized type
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struct MyStr(str);
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// custom unsized type with sized fields
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struct MySlice<T: ?Sized>(bool, T);
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type MySliceBool = MySlice<[bool]>;
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// # str
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// OK
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const STR_VALID: &str = unsafe { mem::transmute((&42u8, 1usize)) };
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// bad str
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const STR_TOO_LONG: &str = unsafe { mem::transmute((&42u8, 999usize)) };
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//~^ ERROR it is undefined behavior to use this value
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const NESTED_STR_MUCH_TOO_LONG: (&str,) = (unsafe { mem::transmute((&42, usize::MAX)) },);
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//~^ ERROR it is undefined behavior to use this value
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// bad str
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const STR_LENGTH_PTR: &str = unsafe { mem::transmute((&42u8, &3)) };
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//~^ ERROR evaluation of constant value failed
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// bad str in user-defined unsized type
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const MY_STR_LENGTH_PTR: &MyStr = unsafe { mem::transmute((&42u8, &3)) };
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//~^ ERROR evaluation of constant value failed
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const MY_STR_MUCH_TOO_LONG: &MyStr = unsafe { mem::transmute((&42u8, usize::MAX)) };
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//~^ ERROR it is undefined behavior to use this value
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// uninitialized byte
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const STR_NO_INIT: &str = unsafe { mem::transmute::<&[_], _>(&[MaybeUninit::<u8> { uninit: () }]) };
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//~^ ERROR it is undefined behavior to use this value
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// uninitialized byte in user-defined str-like
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const MYSTR_NO_INIT: &MyStr = unsafe { mem::transmute::<&[_], _>(&[MaybeUninit::<u8> { uninit: () }]) };
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//~^ ERROR it is undefined behavior to use this value
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// # slice
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// OK
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const SLICE_VALID: &[u8] = unsafe { mem::transmute((&42u8, 1usize)) };
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// bad slice: length uninit
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const SLICE_LENGTH_UNINIT: &[u8] = unsafe {
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//~^ ERROR evaluation of constant value failed
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//~| uninitialized
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let uninit_len = MaybeUninit::<usize> { uninit: () };
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mem::transmute((42, uninit_len))
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};
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// bad slice: length too big
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const SLICE_TOO_LONG: &[u8] = unsafe { mem::transmute((&42u8, 999usize)) };
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//~^ ERROR it is undefined behavior to use this value
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// bad slice: length computation overflows
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const SLICE_TOO_LONG_OVERFLOW: &[u32] = unsafe { mem::transmute((&42u32, isize::MAX)) };
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//~^ ERROR it is undefined behavior to use this value
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// bad slice: length not an int
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const SLICE_LENGTH_PTR: &[u8] = unsafe { mem::transmute((&42u8, &3)) };
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//~^ ERROR evaluation of constant value failed
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// bad slice box: length too big
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const SLICE_TOO_LONG_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, 999usize)) };
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//~^ ERROR it is undefined behavior to use this value
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// bad slice box: length not an int
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const SLICE_LENGTH_PTR_BOX: Box<[u8]> = unsafe { mem::transmute((&42u8, &3)) };
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//~^ ERROR evaluation of constant value failed
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// bad data *inside* the slice
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const SLICE_CONTENT_INVALID: &[bool] = &[unsafe { mem::transmute(3u8) }];
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//~^ ERROR it is undefined behavior to use this value
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//~| constant
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// good MySliceBool
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const MYSLICE_GOOD: &MySliceBool = &MySlice(true, [false]);
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// bad: sized field is not okay
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const MYSLICE_PREFIX_BAD: &MySliceBool = &MySlice(unsafe { mem::transmute(3u8) }, [false]);
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//~^ ERROR it is undefined behavior to use this value
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//~| constant
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// bad: unsized part is not okay
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const MYSLICE_SUFFIX_BAD: &MySliceBool = &MySlice(true, [unsafe { mem::transmute(3u8) }]);
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//~^ ERROR it is undefined behavior to use this value
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//~| constant
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// # raw slice
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const RAW_SLICE_VALID: *const [u8] = unsafe { mem::transmute((&42u8, 1usize)) }; // ok
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const RAW_SLICE_TOO_LONG: *const [u8] = unsafe { mem::transmute((&42u8, 999usize)) }; // ok because raw
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const RAW_SLICE_MUCH_TOO_LONG: *const [u8] = unsafe { mem::transmute((&42u8, usize::MAX)) }; // ok because raw
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const RAW_SLICE_LENGTH_UNINIT: *const [u8] = unsafe {
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//~^ ERROR evaluation of constant value failed
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//~| uninitialized
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let uninit_len = MaybeUninit::<usize> { uninit: () };
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mem::transmute((42, uninit_len))
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};
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// # trait object
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// bad trait object
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const TRAIT_OBJ_SHORT_VTABLE_1: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u8))) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a vtable
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// bad trait object
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const TRAIT_OBJ_SHORT_VTABLE_2: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &3u64))) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a vtable
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// bad trait object
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const TRAIT_OBJ_INT_VTABLE: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, 4usize))) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a vtable
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const TRAIT_OBJ_UNALIGNED_VTABLE: &dyn Trait = unsafe { mem::transmute((&92u8, &[0u8; 128])) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a vtable
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const TRAIT_OBJ_BAD_DROP_FN_NULL: &dyn Trait = unsafe { mem::transmute((&92u8, &[0usize; 8])) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a vtable
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const TRAIT_OBJ_BAD_DROP_FN_INT: &dyn Trait = unsafe { mem::transmute((&92u8, &[1usize; 8])) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a vtable
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const TRAIT_OBJ_BAD_DROP_FN_NOT_FN_PTR: W<&dyn Trait> = unsafe { mem::transmute(W((&92u8, &[&42u8; 8]))) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a vtable
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// bad data *inside* the trait object
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const TRAIT_OBJ_CONTENT_INVALID: &dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) };
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//~^ ERROR it is undefined behavior to use this value
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//~| expected a boolean
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// # raw trait object
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const RAW_TRAIT_OBJ_VTABLE_NULL: *const dyn Trait = unsafe { mem::transmute((&92u8, 0usize)) };
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//~^ ERROR it is undefined behavior to use this value
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const RAW_TRAIT_OBJ_VTABLE_INVALID: *const dyn Trait = unsafe { mem::transmute((&92u8, &3u64)) };
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//~^ ERROR it is undefined behavior to use this value
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const RAW_TRAIT_OBJ_CONTENT_INVALID: *const dyn Trait = unsafe { mem::transmute::<_, &bool>(&3u8) } as *const dyn Trait; // ok because raw
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// Officially blessed way to get the vtable
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const DYN_METADATA: ptr::DynMetadata<dyn Send> = ptr::metadata::<dyn Send>(ptr::null::<i32>());
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// Const eval fails for these, so they need to be statics to error.
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static mut RAW_TRAIT_OBJ_VTABLE_NULL_THROUGH_REF: *const dyn Trait = unsafe {
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//~^ ERROR it is undefined behavior to use this value
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mem::transmute::<_, &dyn Trait>((&92u8, 0usize))
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};
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static mut RAW_TRAIT_OBJ_VTABLE_INVALID_THROUGH_REF: *const dyn Trait = unsafe {
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//~^ ERROR it is undefined behavior to use this value
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mem::transmute::<_, &dyn Trait>((&92u8, &3u64))
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};
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fn main() {}
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