* Add first pass at GuestArray
* Return &'a [T] instead of Vec<Refs>
Also, add a sanity test for `GuestArray`.
* Change approach in GuestArray::as_ref
The new approach should avoid unnecessary copying (does it?) by
iterating through the memory and firstly validating the guest pointers,
to then extracting the slice `&'a [T]` using the unsafe `slice::from_raw_parts`
fn.
* Redo implementation of GuestArray and GuestArrayMut
This commit:
* redos the impl of `as_ref` and `as_ref_mut` for `GuestArray` and
`GuestArrayMut` structs in that they now return dynamically borrow
checked `GuestArrayRef` and `GuestArrayRefMut` structs
* introduces `GuestArrayRef` and `GuestArrayRefMut` structs which
perform dynamic borrow-checking of memory region at runtime, and
can be derefed to `&[T]` and `&mut [T]`
* adds a few sanity checks for the introduced types
* Rename r#ref to ref_
* Add constructors for GuestArray and GuestArrayMut
This commit:
* adds constructors for `GuestArray` and `GuestArrayMut` both of
which can now *only* be constructed from `GuestPtr::array` and
`GuestPtrMut::array_mut` respectively
* changes `Region::extend` to extend the region by adding to the
current `len` (avoids problem of asserting for > 0)
* implements `fmt::Debug` for most of memory types for easier testing
(implementation is *not* enforced on the generic parameter `T` in
the struct; rather, if `T` impls `fmt::Debug` then so does the
memory type such as `GuestPtr<'_, T>`)
664f7d38e0