debug_assert to ensure that from_raw_parts is only used properly aligned

rust-lang · Aug 2, 2018 · 7b24d2b · 7b24d2b
1 parent db54765
commit 7b24d2b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/libcore/slice/mod.rs b/src/libcore/slice/mod.rs
@@ -3878,6 +3878,7 @@ unsafe impl<'a, T> TrustedRandomAccess for ExactChunksMut<'a, T> {
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T] {
+    debug_assert!(data as usize % mem::align_of::<T>() == 0, "attempt to create unaligned slice");
     Repr { raw: FatPtr { data, len } }.rust
 }
 
@@ -3891,6 +3892,7 @@ pub unsafe fn from_raw_parts<'a, T>(data: *const T, len: usize) -> &'a [T] {
 #[inline]
 #[stable(feature = "rust1", since = "1.0.0")]
 pub unsafe fn from_raw_parts_mut<'a, T>(data: *mut T, len: usize) -> &'a mut [T] {
+    debug_assert!(data as usize % mem::align_of::<T>() == 0, "attempt to create unaligned slice");
     Repr { raw: FatPtr { data, len} }.rust_mut
 }