Create functions with type of function class.

vm/src/pyobject.rs

@@ -1,4 +1,5 @@
 use super::bytecode;
+use super::objfunction;
 use super::objint;
 use super::objtype;
 use super::vm::VirtualMachine;
@@ -45,6 +46,7 @@ pub struct PyContext {
     pub list_type: PyObjectRef,
     pub tuple_type: PyObjectRef,
     pub dict_type: PyObjectRef,
+    pub function_type: PyObjectRef,
 }
 
 /*
@@ -61,18 +63,14 @@ pub struct Scope {
 impl PyContext {
     pub fn new() -> PyContext {
         let type_type = objtype::create_type();
-        let int_type = objint::create_type(type_type.clone());
-        // TODO: How to represent builtin types?
-        let list_type = type_type.clone();
-        let tuple_type = type_type.clone();
-        let dict_type = type_type.clone();
-        // let str_type = objstr::make_type();
+
         PyContext {
+            int_type: objint::create_type(type_type.clone()),
+            list_type: type_type.clone(),
+            tuple_type: type_type.clone(),
+            dict_type: type_type.clone(),
+            function_type: objfunction::create_type(type_type.clone()),
             type_type: type_type,
-            int_type: int_type,
-            list_type: list_type,
-            tuple_type: tuple_type,
-            dict_type: dict_type,
         }
     }
 
@@ -154,6 +152,16 @@ impl PyContext {
         )
     }
 
+    pub fn new_function(&self, code_obj: PyObjectRef, scope: PyObjectRef) -> PyObjectRef {
+        PyObject::new(
+            PyObjectKind::Function {
+                code: code_obj,
+                scope: scope,
+            },
+            self.function_type.clone(),
+        )
+    }
+
     /* TODO: something like this?
     pub fn new_instance(&self, name: String) -> PyObjectRef {
         PyObject::new(PyObjectKind::Class { name: name }, self.type_type.clone())

vm/src/vm.rs

@@ -692,13 +692,7 @@ impl VirtualMachine {
                 // pop argc arguments
                 // argument: name, args, globals
                 let scope = self.current_frame().locals.clone();
-                let obj = PyObject::new(
-                    PyObjectKind::Function {
-                        code: code_obj,
-                        scope: scope,
-                    },
-                    self.get_type(),
-                );
+                let obj = self.ctx.new_function(code_obj, scope);
                 self.push_value(obj);
                 None
             }