add some help function to frame object

src/runtime/frame.cpp

@@ -149,6 +149,15 @@ Box* getFrame(int depth) {
     return BoxedFrame::boxFrame(std::move(it));
 }
 
+extern "C" int PyFrame_GetLineNumber(Box* f) {
+    BoxedInt* lineno = (BoxedInt*)BoxedFrame::lineno(f, NULL);
+    return lineno->n;
+}
+
+extern "C" PyObject* PyFrame_GetGlobals(Box* f) {
+    return BoxedFrame::globals(f, NULL);
+}
+
 void setupFrame() {
     frame_cls
         = BoxedClass::create(type_cls, object_cls, &BoxedFrame::gchandler, 0, 0, sizeof(BoxedFrame), false, "frame");