diff options
Diffstat (limited to 'src/mem.rs')
| -rw-r--r-- | src/mem.rs | 11 |
1 files changed, 9 insertions, 2 deletions
@@ -194,6 +194,9 @@ compile_error!("Current RAM implementation requires a little-endian host."); impl Ram { pub fn try_new(size: usize) -> Result<Self, std::io::Error> { + if !size.is_multiple_of(8) { + return Err(std::io::Error::other("ram size must be a multiple of 8")); + } Ok(Self { buf: MmapMut::map_anon(size)?, }) @@ -204,9 +207,13 @@ impl Ram { } /// # Safety - /// Safe if T has a size divisible by page size (4kb) (or is known to have a size divisible by the full ram size) and you know that the RAM is made up of valid naturally aligned values of T + /// Safe if the size of the memory in bytes is divisible by the size of T + /// Assuming try_new is used, RAM size is guaranteed to be a multiple of 8 + /// meaning anything with size 1, 2, 4, or 8 bytes is valid. + /// It must also be known that the contents of RAM are made up of naturally + /// aligned valid instances of T. #[inline] - pub unsafe fn buf_transmuted<T>(&self) -> &[T] { + unsafe fn buf_transmuted<T>(&self) -> &[T] { debug_assert!(self.buf.len().is_multiple_of(std::mem::size_of::<T>())); unsafe { std::slice::from_raw_parts( |