mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-12 00:24:03 +00:00
60 lines
2.3 KiB
Rust
60 lines
2.3 KiB
Rust
// Strip out raw byte dumps to make comparison platform-independent:
|
|
//@ normalize-stderr-test "(the raw bytes of the constant) \(size: [0-9]*, align: [0-9]*\)" -> "$1 (size: $$SIZE, align: $$ALIGN)"
|
|
//@ normalize-stderr-test "([0-9a-f][0-9a-f] |╾─*ALLOC[0-9]+(\+[a-z0-9]+)?─*╼ )+ *│.*" -> "HEX_DUMP"
|
|
#![allow(invalid_value)] // make sure we cannot allow away the errors tested here
|
|
#![feature(rustc_attrs, ptr_metadata)]
|
|
|
|
use std::mem;
|
|
use std::ptr::NonNull;
|
|
use std::num::NonZero;
|
|
|
|
const NON_NULL: NonNull<u8> = unsafe { mem::transmute(1usize) };
|
|
const NON_NULL_PTR: NonNull<u8> = unsafe { mem::transmute(&1) };
|
|
|
|
const NULL_PTR: NonNull<u8> = unsafe { mem::transmute(0usize) };
|
|
//~^ ERROR it is undefined behavior to use this value
|
|
|
|
const OUT_OF_BOUNDS_PTR: NonNull<u8> = { unsafe {
|
|
let ptr: &[u8; 256] = mem::transmute(&0u8); // &0 gets promoted so it does not dangle
|
|
// Use address-of-element for pointer arithmetic. This could wrap around to null!
|
|
let out_of_bounds_ptr = &ptr[255]; //~ ERROR evaluation of constant value failed
|
|
mem::transmute(out_of_bounds_ptr)
|
|
} };
|
|
|
|
const NULL_U8: NonZero<u8> = unsafe { mem::transmute(0u8) };
|
|
//~^ ERROR it is undefined behavior to use this value
|
|
const NULL_USIZE: NonZero<usize> = unsafe { mem::transmute(0usize) };
|
|
//~^ ERROR it is undefined behavior to use this value
|
|
|
|
#[repr(C)]
|
|
union MaybeUninit<T: Copy> {
|
|
uninit: (),
|
|
init: T,
|
|
}
|
|
const UNINIT: NonZero<u8> = unsafe { MaybeUninit { uninit: () }.init };
|
|
//~^ ERROR evaluation of constant value failed
|
|
//~| uninitialized
|
|
|
|
// Also test other uses of rustc_layout_scalar_valid_range_start
|
|
|
|
#[rustc_layout_scalar_valid_range_start(10)]
|
|
#[rustc_layout_scalar_valid_range_end(30)]
|
|
struct RestrictedRange1(u32);
|
|
const BAD_RANGE1: RestrictedRange1 = unsafe { RestrictedRange1(42) };
|
|
//~^ ERROR it is undefined behavior to use this value
|
|
|
|
#[rustc_layout_scalar_valid_range_start(30)]
|
|
#[rustc_layout_scalar_valid_range_end(10)]
|
|
struct RestrictedRange2(u32);
|
|
const BAD_RANGE2: RestrictedRange2 = unsafe { RestrictedRange2(20) };
|
|
//~^ ERROR it is undefined behavior to use this value
|
|
|
|
const NULL_FAT_PTR: NonNull<dyn Send> = unsafe {
|
|
//~^ ERROR it is undefined behavior to use this value
|
|
let x: &dyn Send = &42;
|
|
let meta = std::ptr::metadata(x);
|
|
mem::transmute((0_usize, meta))
|
|
};
|
|
|
|
fn main() {}
|