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60 lines
2.3 KiB
Rust
60 lines
2.3 KiB
Rust
// 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] |╾─*a(lloc)?[0-9]+(\+[a-z0-9]+)?─*╼ )+ *│.*" -> "HEX_DUMP"
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#![feature(rustc_attrs, ptr_metadata)]
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#![allow(invalid_value)] // make sure we cannot allow away the errors tested here
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use std::mem;
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use std::ptr::NonNull;
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use std::num::{NonZeroU8, NonZeroUsize};
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const NON_NULL: NonNull<u8> = unsafe { mem::transmute(1usize) };
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const NON_NULL_PTR: NonNull<u8> = unsafe { mem::transmute(&1) };
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const NULL_PTR: NonNull<u8> = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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const OUT_OF_BOUNDS_PTR: NonNull<u8> = { unsafe {
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let ptr: &[u8; 256] = mem::transmute(&0u8); // &0 gets promoted so it does not dangle
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// Use address-of-element for pointer arithmetic. This could wrap around to null!
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let out_of_bounds_ptr = &ptr[255]; //~ ERROR evaluation of constant value failed
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mem::transmute(out_of_bounds_ptr)
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} };
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const NULL_U8: NonZeroU8 = unsafe { mem::transmute(0u8) };
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//~^ ERROR it is undefined behavior to use this value
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const NULL_USIZE: NonZeroUsize = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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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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const UNINIT: NonZeroU8 = unsafe { MaybeUninit { uninit: () }.init };
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//~^ ERROR evaluation of constant value failed
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//~| uninitialized
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// Also test other uses of rustc_layout_scalar_valid_range_start
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#[rustc_layout_scalar_valid_range_start(10)]
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#[rustc_layout_scalar_valid_range_end(30)]
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struct RestrictedRange1(u32);
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const BAD_RANGE1: RestrictedRange1 = unsafe { RestrictedRange1(42) };
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//~^ ERROR it is undefined behavior to use this value
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#[rustc_layout_scalar_valid_range_start(30)]
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#[rustc_layout_scalar_valid_range_end(10)]
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struct RestrictedRange2(u32);
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const BAD_RANGE2: RestrictedRange2 = unsafe { RestrictedRange2(20) };
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//~^ ERROR it is undefined behavior to use this value
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const NULL_FAT_PTR: NonNull<dyn Send> = unsafe {
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//~^ ERROR it is undefined behavior to use this value
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let x: &dyn Send = &42;
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let meta = std::ptr::metadata(x);
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mem::transmute((0_usize, meta))
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};
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fn main() {}
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