Initial commit

* Parser, compiler, objects, and VM base implementations
* Stuff will print out, functions called, etc
* There are probably plenty of bugs but this is a good starting point to
  start committing changes into git

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/vm/inst.rs

@@ -0,0 +1,32 @@
+use crate::obj::ObjPtr;
+use crate::vm::name::Name;
+
+#[derive(Debug, Clone)]
+pub enum Inst {
+    /// Pushes an object to the stack.
+    Push(ObjPtr),
+
+    /// Loads a local value in a name and pushes it to the stack.
+    Load(Name),
+
+    /// Pops the top item off of the stack and stores it in a name.
+    Store(Name),
+
+    /// Get an attribute from the top item of the stack.
+    GetAttr(String),
+
+    /// Pops the top item off of the stack, discarding it.
+    Pop,
+
+    /// Pops the top N function arguments off the stack, and attempt to call the
+    /// next stack item.
+    Call(usize),
+
+    /// Exits the current function stack frame and returns control to the
+    /// calling function.
+    ///
+    /// This will take the last value on top of the stack (the return value),
+    /// resize the stack to its last size (pre-call), and push the return value
+    /// back to the top of the stack.
+    Return,
+}