1 // compile-flags: --crate-type=lib
2 // normalize-stderr-32bit: "8 bytes" -> "$$TWO_WORDS bytes"
3 // normalize-stderr-64bit: "16 bytes" -> "$$TWO_WORDS bytes"
4 // normalize-stderr-32bit: "size 4" -> "size $$WORD"
5 // normalize-stderr-64bit: "size 8" -> "size $$WORD"
9 const_raw_ptr_comparison,
13 const FOO: &usize = &42;
16 (eq, $a:expr, $b:expr) => {
18 assert!(std::intrinsics::ptr_guaranteed_eq($a as *const u8, $b as *const u8));
20 (ne, $a:expr, $b:expr) => {
22 assert!(std::intrinsics::ptr_guaranteed_ne($a as *const u8, $b as *const u8));
24 (!eq, $a:expr, $b:expr) => {
26 assert!(!std::intrinsics::ptr_guaranteed_eq($a as *const u8, $b as *const u8));
28 (!ne, $a:expr, $b:expr) => {
30 assert!(!std::intrinsics::ptr_guaranteed_ne($a as *const u8, $b as *const u8));
38 check!(ne, FOO as *const _, 0);
39 check!(!eq, FOO as *const _, 0);
40 // We want pointers to be equal to themselves, but aren't checking this yet because
41 // there are some open questions (e.g. whether function pointers to the same function
42 // compare equal, they don't necessarily at runtime).
43 // The case tested here should work eventually, but does not work yet.
44 check!(!eq, FOO as *const _, FOO as *const _);
45 check!(ne, unsafe { (FOO as *const usize).offset(1) }, 0);
46 check!(!eq, unsafe { (FOO as *const usize).offset(1) }, 0);
48 check!(ne, unsafe { (FOO as *const usize as *const u8).offset(3) }, 0);
49 check!(!eq, unsafe { (FOO as *const usize as *const u8).offset(3) }, 0);
51 ///////////////////////////////////////////////////////////////////////////////
52 // If any of the below start compiling, make sure to add a `check` test for it.
53 // These invocations exist as canaries so we don't forget to check that the
54 // behaviour of `guaranteed_eq` and `guaranteed_ne` is still correct.
55 // All of these try to obtain an out of bounds pointer in some manner. If we
56 // can create out of bounds pointers, we can offset a pointer far enough that
57 // at runtime it would be zero and at compile-time it would not be zero.
59 const _: *const usize = unsafe { (FOO as *const usize).offset(2) };
62 unsafe { std::ptr::addr_of!((*(FOO as *const usize as *const [u8; 1000]))[999]) };
63 //~^ ERROR evaluation of constant value failed
66 const _: usize = unsafe { std::mem::transmute::<*const usize, usize>(FOO) + 4 };
67 //~^ ERROR any use of this value will cause an error
68 //~| unable to turn pointer into raw bytes
69 //~| WARN this was previously accepted by the compiler but is being phased out
71 const _: usize = unsafe { *std::mem::transmute::<&&usize, &usize>(&FOO) + 4 };
72 //~^ ERROR any use of this value will cause an error
73 //~| unable to turn pointer into raw bytes
74 //~| WARN this was previously accepted by the compiler but is being phased out