This commit removes the dependency upon Mycelium::sexpr::Datum from Hyphae
and instead adds a heap.rs module including three types:
- Gc: This is essentially a Box<Rc<T>> but passed around as a *const Rc<T>.
not only does this allow the wrapped T to be passed around in a format
that fits completely within a single physical register, this also
applies a greedy reference counting garbage collection to each and
every object allocated in the VM.
- Datum: This is a simplified enum for type polymorphism. Similar to the
original Mycelium::sexpr::Datum.
- Cons: This is a very standard Cons cell type.
Additionally, two new instructions are added:
- DUPL: a deep copy instruction
- CONST: an instruction to create number datum from embedded constants
- NTOI: casts a number to its inexact form
- NTOE: casts a number to its exact form
Fixes: #35 and #36
Signed-off-by: Ava Affine <ava@sunnypup.io>
This commit is a WORK IN PROGRESS for the base implementation of the
HyphaeVM. This will be squashed into a larger commit eventually when
the work of implementing the HyphaeVM is finished.
Of note, the ISA is mostly finished and much of the VM design is in
place. Yet to be done are a few traps in mycelium, migrating pieces
like the number package and the sexpr package into the VM package,
and of course much testing.
Signed-off-by: Ava Affine <ava@sunnypup.io>
