| #![allow(dead_code)] |
| |
| // We use packed structs to get around alignment restrictions |
| #[repr(packed)] |
| struct Data { |
| pad: u8, |
| ptr: &'static i32, |
| } |
| |
| // But we need to gurantee some alignment |
| struct Wrapper { |
| align: u64, |
| data: Data, |
| } |
| |
| static G : i32 = 0; |
| |
| fn main() { |
| let mut w = Wrapper { align: 0, data: Data { pad: 0, ptr: &G } }; |
| |
| // Get a pointer to the beginning of the Data struct (one u8 byte, then the pointer bytes). |
| // Thanks to the wrapper, we know this is aligned-enough to perform a load at ptr size. |
| // We load at pointer type, so having a relocation is ok -- but here, the relocation |
| // starts 1 byte to the right, so using it would actually be wrong! |
| let d_alias = &mut w.data as *mut _ as *mut *const u8; |
| unsafe { |
| let _x = *d_alias; //~ ERROR tried to access part of a pointer value as raw bytes |
| } |
| } |
