Add notification callback for module state changes (#4656)

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/include/jerryscript-core.h

@@ -269,6 +269,7 @@ jerry_value_t jerry_module_link (const jerry_value_t module_val,
                                  jerry_module_resolve_callback_t callback_p, void *user_p);
 jerry_value_t jerry_module_evaluate (const jerry_value_t module_val);
 jerry_module_state_t jerry_module_get_state (const jerry_value_t module_val);
+void jerry_module_set_state_changed_callback (jerry_module_state_changed_callback_t callback, void *user_p);
 size_t jerry_module_get_number_of_requests (const jerry_value_t module_val);
 jerry_value_t jerry_module_get_request (const jerry_value_t module_val, size_t request_index);
 jerry_value_t jerry_module_get_namespace (const jerry_value_t module_val);

jerry-core/include/jerryscript-types.h

@@ -550,6 +550,12 @@ typedef jerry_value_t (*jerry_module_resolve_callback_t) (const jerry_value_t sp
                                                           const jerry_value_t referrer,
                                                           void *user_p);
 
+/**
+ * Callback which is called after the module enters into linked, evaluated or error state.
+ */
+typedef void (*jerry_module_state_changed_callback_t) (jerry_module_state_t new_state, const jerry_value_t module,
+                                                       const jerry_value_t value, void *user_p);
+
 /**
  * Callback which is called by jerry_module_evaluate to evaluate the native module.
  */