From fc3cfc4fdc1e3f0b245eca24b6a3778f05704f35 Mon Sep 17 00:00:00 2001
From: Robert Fancsik <frobert@inf.u-szeged.hu>
Date: Mon, 4 Nov 2019 12:12:01 +0100
Subject: [PATCH] Arrow functions "prototype" property should not be lazy
 listed (#3268)

This patch fixes #3267.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
---
 .../ecma/operations/ecma-function-object.c    | 10 ++++-----
 .../es2015/regression-test-issue-3267.js      | 22 +++++++++++++++++++
 2 files changed, 27 insertions(+), 5 deletions(-)
 create mode 100644 tests/jerry/es2015/regression-test-issue-3267.js

diff --git a/jerry-core/ecma/operations/ecma-function-object.c b/jerry-core/ecma/operations/ecma-function-object.c
index e2e8871f0..41b8996cc 100644
--- a/jerry-core/ecma/operations/ecma-function-object.c
+++ b/jerry-core/ecma/operations/ecma-function-object.c
@@ -1437,9 +1437,6 @@ ecma_op_function_list_lazy_property_names (ecma_object_t *object_p, /**< functio
   /* 'length' property is non-enumerable (ECMA-262 v5, 13.2.5) */
   ecma_collection_push_back (for_non_enumerable_p, ecma_make_magic_string_value (LIT_MAGIC_STRING_LENGTH));
 
-  /* 'prototype' property is non-enumerable (ECMA-262 v5, 13.2.18) */
-  ecma_collection_push_back (for_non_enumerable_p, ecma_make_magic_string_value (LIT_MAGIC_STRING_PROTOTYPE));
-
   const ecma_compiled_code_t *bytecode_data_p;
 
 #if ENABLED (JERRY_ES2015)
@@ -1449,10 +1446,13 @@ ecma_op_function_list_lazy_property_names (ecma_object_t *object_p, /**< functio
   }
   else
   {
+#endif /* ENABLED (JERRY_ES2015) */
     bytecode_data_p = ecma_op_function_get_compiled_code ((ecma_extended_object_t *) object_p);
+
+    /* 'prototype' property is non-enumerable (ECMA-262 v5, 13.2.18) */
+    ecma_collection_push_back (for_non_enumerable_p, ecma_make_magic_string_value (LIT_MAGIC_STRING_PROTOTYPE));
+#if ENABLED (JERRY_ES2015)
   }
-#else /* ENABLED (JERRY_ES2015) */
-  bytecode_data_p = ecma_op_function_get_compiled_code ((ecma_extended_object_t *) object_p);
 #endif /* ENABLED (JERRY_ES2015) */
 
   if (bytecode_data_p->status_flags & CBC_CODE_FLAGS_STRICT_MODE)
diff --git a/tests/jerry/es2015/regression-test-issue-3267.js b/tests/jerry/es2015/regression-test-issue-3267.js
new file mode 100644
index 000000000..3e574fdb9
--- /dev/null
+++ b/tests/jerry/es2015/regression-test-issue-3267.js
@@ -0,0 +1,22 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var hasProp = $ => { }
+Object.preventExtensions(hasProp);
+assert (Object.isSealed(hasProp));
+
+var keys = Object.getOwnPropertyNames(hasProp);
+assert (keys.length === 1);
+assert (keys[0] === "length");
+