Introduce jerry_port_track_promise_rejection (#4451)

This patch resolves #2931.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu

jerry-core/ecma/operations/ecma-promise-object.c

@@ -181,6 +181,23 @@ ecma_is_resolver_already_called (ecma_object_t *promise_obj_p) /**< promise */
   return (ecma_promise_get_flags (promise_obj_p) & ECMA_PROMISE_ALREADY_RESOLVED) != 0;
 } /* ecma_is_resolver_already_called */
 
+/**
+ * HostPromiseRejectionTracker
+ *
+ * See also: ES11 25.6.1.9
+ */
+static void
+ecma_track_promise_rejection (ecma_object_t *obj_p, /**< rejected promise */
+                              jerry_promise_rejection_operation_t operation) /**< operation */
+{
+  JERRY_ASSERT (ecma_is_promise (obj_p));
+
+  if (!(ecma_promise_get_flags (obj_p) & ECMA_PROMISE_HANDLED))
+  {
+    jerry_port_track_promise_rejection (ecma_make_object_value (obj_p), operation);
+  }
+} /* ecma_track_promise_rejection */
+
 /**
  * Reject a Promise with a reason.
  *
@@ -208,6 +225,7 @@ ecma_reject_promise (ecma_value_t promise, /**< promise */
   promise_p->reactions = ecma_new_collection ();
 
   ecma_collection_destroy (reactions);
+  ecma_track_promise_rejection (obj_p, JERRY_PROMISE_REJECTION_OPERATION_REJECT);
 } /* ecma_reject_promise */
 
 /**
@@ -818,10 +836,14 @@ ecma_promise_do_then (ecma_value_t promise, /**< the promise which call 'then' *
   {
     /* 9. */
     ecma_value_t reason = ecma_promise_get_result (promise_obj_p);
+    ecma_track_promise_rejection (promise_obj_p, JERRY_PROMISE_REJECTION_OPERATION_HANDLE);
     ecma_enqueue_promise_reaction_job (ecma_make_object_value (result_capability_obj_p), on_rejected, reason);
     ecma_free_value (reason);
   }
 
+  /* ES11: 11. */
+  promise_p->header.u.class_prop.extra_info |= ECMA_PROMISE_HANDLED;
+
   /* 10. */
   return ecma_copy_value (capability_p->header.u.class_prop.u.promise);
 } /* ecma_promise_do_then */

jerry-core/ecma/operations/ecma-promise-object.h

@@ -34,6 +34,7 @@ typedef enum
   ECMA_PROMISE_IS_PENDING = (1 << 0), /**< pending state */
   ECMA_PROMISE_IS_FULFILLED = (1 << 1), /**< fulfilled state */
   ECMA_PROMISE_ALREADY_RESOLVED = (1 << 2), /**< already resolved */
+  ECMA_PROMISE_HANDLED = (1 << 3), /**< ES11: 25.6.6 [[PromiseIsHandled]] internal slot */
 } ecma_promise_flags_t;
 
 /**

jerry-core/include/jerryscript-port.h

@@ -252,6 +252,28 @@ size_t jerry_port_normalize_path (const char *in_path_p,
  */
 jerry_value_t jerry_port_get_native_module (jerry_value_t name);
 
+/**
+ * HostPromiseRejectionTracker operations
+ */
+typedef enum
+{
+  JERRY_PROMISE_REJECTION_OPERATION_REJECT, /**< promise is rejected without any handlers */
+  JERRY_PROMISE_REJECTION_OPERATION_HANDLE, /**< handler is added to a rejected promise for the first time */
+} jerry_promise_rejection_operation_t;
+
+/**
+ * Track unhandled promise rejections.
+ *
+ * Note:
+ *      This port function is called by jerry-core when JERRY_BUILTIN_PROMISE
+ *      is enabled.
+ *
+ * @param promise rejected promise
+ * @param operation HostPromiseRejectionTracker operation
+ */
+void jerry_port_track_promise_rejection (const jerry_value_t promise,
+                                         const jerry_promise_rejection_operation_t operation);
+
 /**
  * @}
  */