Add code and frame python objects.

vm/src/obj/objcode.rs

@@ -0,0 +1,44 @@
+/*! Infamous code object. The python class `code`
+
+*/
+
+use super::super::bytecode;
+use super::super::pyobject::{
+    AttributeProtocol, PyContext, PyFuncArgs, PyObjectKind, PyObjectRef, PyResult, TypeProtocol,
+};
+use super::super::vm::VirtualMachine;
+use super::objtype;
+
+pub fn init(context: &PyContext) {
+    let ref code_type = context.code_type;
+    code_type.set_attr("__repr__", context.new_rustfunc(code_repr));
+}
+
+/// Extract rust bytecode object from a python code object.
+pub fn copy_code(code_obj: &PyObjectRef) -> bytecode::CodeObject {
+    let code_obj = code_obj.borrow();
+    if let PyObjectKind::Code { ref code } = code_obj.kind {
+        code.clone()
+    } else {
+        panic!("Must be code obj");
+    }
+}
+
+fn code_repr(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
+    arg_check!(vm, args, required = [(o, Some(vm.ctx.code_type()))]);
+
+    // Fetch actual code:
+    let code = copy_code(o);
+
+    let file = if let Some(source_path) = code.source_path {
+        format!(", file {}", source_path)
+    } else {
+        String::new()
+    };
+
+    // TODO: fetch proper line info from code object
+    let line = format!(", line 1");
+
+    let repr = format!("<code object at .. {}{}>", file, line);
+    Ok(vm.new_str(repr))
+}