[fine] Methods!

fine/src/vm.rs

@@ -102,6 +102,18 @@ impl Frame {
         }
     }
 
+    pub fn func(&self) -> Rc<Function> {
+        self.func.clone()
+    }
+
+    pub fn args(&self) -> &[StackValue] {
+        &self.args
+    }
+
+    pub fn pc(&self) -> usize {
+        self.pc
+    }
+
     fn pop_value(&mut self) -> Result<StackValue> {
         self.stack.pop().ok_or_else(|| VMErrorCode::StackUnderflow)
     }