Fix is_constructor of bound function (#3684)

Bound function created from built-in function does not have a constructor

JerryScript-DCO-1.0-Signed-off-by: Rafal Walczyna r.walczyna@samsung.com

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

@@ -114,7 +114,17 @@ ecma_object_is_constructor (ecma_object_t *obj_p) /**< ecma object */
 {
   JERRY_ASSERT (!ecma_is_lexical_environment (obj_p));
 
-  const ecma_object_type_t type = ecma_get_object_type (obj_p);
+  ecma_object_type_t type = ecma_get_object_type (obj_p);
+
+  while (type == ECMA_OBJECT_TYPE_BOUND_FUNCTION)
+  {
+    ecma_bound_function_t *bound_func_p = (ecma_bound_function_t *) obj_p;
+
+    obj_p = ECMA_GET_NON_NULL_POINTER_FROM_POINTER_TAG (ecma_object_t,
+                                                        bound_func_p->header.u.bound_function.target_function);
+
+    type = ecma_get_object_type (obj_p);
+  }
 
 #if ENABLED (JERRY_ES2015_BUILTIN_PROXY)
   if (ECMA_OBJECT_TYPE_IS_PROXY (type))
@@ -128,7 +138,7 @@ ecma_object_is_constructor (ecma_object_t *obj_p) /**< ecma object */
     return (!ecma_get_object_is_builtin (obj_p) || !ecma_builtin_function_is_routine (obj_p));
   }
 
-  return (type >= ECMA_OBJECT_TYPE_BOUND_FUNCTION);
+  return (type >= ECMA_OBJECT_TYPE_EXTERNAL_FUNCTION);
 } /* ecma_object_is_constructor */
 
 /**

tests/jerry/es2015/array-of.js

@@ -64,6 +64,12 @@ assert(hits === 1);
 assert(array6.length === 2);
 assert(array6[1] === 2);
 
+// Test with bounded builtin function
+var boundedBuiltinFn = Array.of.bind(Array);
+var array7 = Array.of.call(boundedBuiltinFn, boundedBuiltinFn);
+assert(array7.length === 1);
+assert(array7[0] === boundedBuiltinFn);
+
 // Test superficial features
 var desc = Object.getOwnPropertyDescriptor(Array, "of");
 assert(desc.configurable === true);