103 lines
3.6 KiB
Rust
103 lines
3.6 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(
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slice_from_ptr_range,
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const_slice_from_ptr_range,
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pointer_byte_offsets,
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const_pointer_byte_offsets
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)]
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use std::{
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mem::{size_of, MaybeUninit},
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ptr,
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slice::{from_ptr_range, from_raw_parts},
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};
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// Null is never valid for reads
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pub static S0: &[u32] = unsafe { from_raw_parts(ptr::null(), 0) };
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//~^ ERROR: it is undefined behavior to use this value
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pub static S1: &[()] = unsafe { from_raw_parts(ptr::null(), 0) };
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//~^ ERROR: it is undefined behavior to use this value
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// Out of bounds
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pub static S2: &[u32] = unsafe { from_raw_parts(&D0, 2) };
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//~^ ERROR: it is undefined behavior to use this value
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// Reading uninitialized data
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pub static S4: &[u8] = unsafe { from_raw_parts((&D1) as *const _ as _, 1) }; //~ 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 _, size_of::<&u32>()) }; //~ 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) }; //~ 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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// Unaligned read
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pub static S8: &[u64] = unsafe {
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//~^ ERROR: it is undefined behavior to use this value
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let ptr = (&D4 as *const [u32; 2] as *const u32).byte_add(1).cast::<u64>();
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from_raw_parts(ptr, 1)
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};
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pub static R0: &[u32] = unsafe { from_ptr_range(ptr::null()..ptr::null()) };
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pub static R1: &[()] = unsafe { from_ptr_range(ptr::null()..ptr::null()) };
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pub static R2: &[u32] = unsafe {
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let ptr = &D0 as *const u32;
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from_ptr_range(ptr..ptr.add(2))
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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 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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pub static R7: &[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).byte_add(1);
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from_ptr_range(ptr..ptr.add(4))
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};
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pub static R8: &[u64] = unsafe {
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let ptr = (&D4 as *const [u32; 2] as *const u32).byte_add(1).cast::<u64>();
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from_ptr_range(ptr..ptr.add(1)) //~ inside `R8`
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};
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// This is sneaky: &D0 and &D0 point to different objects
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// (even if at runtime they have the same address)
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pub static R9: &[u32] = unsafe { from_ptr_range(&D0..(&D0 as *const u32).add(1)) };
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pub static R10: &[u32] = unsafe { from_ptr_range(&D0..&D0) };
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const D0: u32 = 0x11111111; // Constant chosen for endianness-independent behavior.
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const D1: MaybeUninit<&u32> = 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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const D4: [u32; 2] = [17, 42];
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#[repr(C)]
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struct Struct {
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a: u8,
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// _pad: [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: [MaybeUninit<u8>; 1]
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}
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fn main() {}
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