257 lines
9.4 KiB
Rust
257 lines
9.4 KiB
Rust
//@ stderr-per-bitwidth
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//@ ignore-endian-big
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// ignore-tidy-linelength
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//@ normalize-stderr-test "╾─*ALLOC[0-9]+(\+[a-z0-9]+)?(<imm>)?─*╼" -> "╾ALLOC_ID$1╼"
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#![allow(invalid_value)]
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#![feature(generic_nonzero, never_type, rustc_attrs, ptr_metadata, slice_from_ptr_range, const_slice_from_ptr_range)]
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use std::mem;
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use std::alloc::Layout;
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use std::ptr::NonNull;
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use std::num::NonZero;
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use std::slice::{from_ptr_range, from_raw_parts};
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// # Bad enums and chars
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#[repr(usize)]
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#[derive(Copy, Clone)]
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enum Enum {
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A = 0,
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}
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const BAD_ENUM: Enum = unsafe { mem::transmute(1usize) };
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//~^ ERROR is undefined behavior
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#[repr(usize)]
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#[derive(Copy, Clone)]
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enum Enum2 {
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A = 2,
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}
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const BAD_ENUM2: Enum2 = unsafe { mem::transmute(0usize) };
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//~^ ERROR is undefined behavior
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#[derive(Copy, Clone)]
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enum Never {}
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// An enum with 3 variants of which some are uninhabited -- so the uninhabited variants *do*
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// have a discriminant.
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enum UninhDiscriminant {
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A,
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B(!),
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C,
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D(Never),
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}
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const BAD_UNINHABITED_VARIANT1: UninhDiscriminant = unsafe { mem::transmute(1u8) };
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//~^ ERROR is undefined behavior
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const BAD_UNINHABITED_VARIANT2: UninhDiscriminant = unsafe { mem::transmute(3u8) };
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//~^ ERROR is undefined behavior
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// Invalid enum field content (mostly to test printing of paths for enum tuple
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// variants and tuples).
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// Need to create something which does not clash with enum layout optimizations.
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const BAD_OPTION_CHAR: Option<(char, char)> = Some(('x', unsafe { mem::transmute(!0u32) }));
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//~^ ERROR is undefined behavior
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// # Bad pointers and references
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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 NULL_U8: NonZero<u8> = unsafe { mem::transmute(0u8) };
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//~^ ERROR it is undefined behavior to use this value
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const NULL_USIZE: NonZero<usize> = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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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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const UNALIGNED: &u16 = unsafe { mem::transmute(&[0u8; 4]) };
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//~^ ERROR it is undefined behavior to use this value
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//~| constructing invalid value: encountered an unaligned reference (required 2 byte alignment but found 1)
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const UNALIGNED_BOX: Box<u16> = unsafe { mem::transmute(&[0u8; 4]) };
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//~^ ERROR it is undefined behavior to use this value
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//~| constructing invalid value: encountered an unaligned box (required 2 byte alignment but found 1)
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const NULL: &u16 = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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const NULL_BOX: Box<u16> = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) };
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//~^ ERROR it is undefined behavior to use this value
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const USIZE_AS_BOX: Box<u8> = unsafe { mem::transmute(1337usize) };
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//~^ ERROR it is undefined behavior to use this value
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const NULL_FN_PTR: fn() = unsafe { mem::transmute(0usize) };
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//~^ ERROR it is undefined behavior to use this value
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const DANGLING_FN_PTR: fn() = unsafe { mem::transmute(13usize) };
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//~^ ERROR it is undefined behavior to use this value
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const DATA_FN_PTR: fn() = unsafe { mem::transmute(&13) };
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//~^ ERROR it is undefined behavior to use this value
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#[derive(Copy, Clone)]
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enum Bar {}
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const BAD_BAD_REF: &Bar = unsafe { mem::transmute(1usize) };
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//~^ ERROR it is undefined behavior to use this value
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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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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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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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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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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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const MYSTR_NO_INIT_ISSUE83182: &MyStr = unsafe { mem::transmute::<&[_], _>(&[&()]) };
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//~^ ERROR: it is undefined behavior to use this value
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// # slice
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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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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 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 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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// 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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// 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_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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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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// Uninhabited types
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const _: &[!; 1] = unsafe { &*(1_usize as *const [!; 1]) }; //~ ERROR undefined behavior
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const _: &[!] = unsafe { &*(1_usize as *const [!; 1]) }; //~ ERROR undefined behavior
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const _: &[!] = unsafe { &*(1_usize as *const [!; 42]) }; //~ ERROR undefined behavior
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// Reading uninitialized data
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pub static S4: &[u8] = unsafe { from_raw_parts((&D1) as *const _ as _, 1) };
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//~^ ERROR: it is undefined behavior to use this value
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// Reinterpret pointers as integers (UB in CTFE.)
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pub static S5: &[u8] = unsafe { from_raw_parts((&D3) as *const _ as _, mem::size_of::<&u32>()) };
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//~^ ERROR: it is undefined behavior to use this value
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// Layout mismatch
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pub static S6: &[bool] = unsafe { from_raw_parts((&D0) as *const _ as _, 4) };
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//~^ ERROR: it is undefined behavior to use this value
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// Reading padding is not ok
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pub static S7: &[u16] = unsafe {
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//~^ ERROR: it is undefined behavior to use this value
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let ptr = (&D2 as *const Struct as *const u16).add(1);
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from_raw_parts(ptr, 4)
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};
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pub static R4: &[u8] = unsafe {
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//~^ ERROR: it is undefined behavior to use this value
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let ptr = (&D1) as *const mem::MaybeUninit<&u32> as *const u8;
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from_ptr_range(ptr..ptr.add(1))
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};
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pub static R5: &[u8] = unsafe {
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//~^ ERROR: it is undefined behavior to use this value
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let ptr = &D3 as *const &u32;
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from_ptr_range(ptr.cast()..ptr.add(1).cast())
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};
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pub static R6: &[bool] = unsafe {
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//~^ ERROR: it is undefined behavior to use this value
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let ptr = &D0 as *const u32 as *const bool;
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from_ptr_range(ptr..ptr.add(4))
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};
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const D0: u32 = 0x11111111; // Constant chosen for endianness-independent behavior.
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const D1: mem::MaybeUninit<&u32> = mem::MaybeUninit::uninit();
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const D2: Struct = Struct { a: 1, b: 2, c: 3, d: 4 };
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const D3: &u32 = &42;
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#[repr(C)]
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struct Struct {
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a: u8,
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// _pad: [mem::MaybeUninit<u8>; 3]
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b: u32,
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c: u16,
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d: u8,
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// _pad: [mem::MaybeUninit<u8>; 1]
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}
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fn main() {}
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