Ava Affine
cf626b2bfc
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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>
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