Fix "arguments" string parsing inside functions

This patch fixes #2656.

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

Author: rerobika

jerry-core/parser/js/js-lexer.c

@@ -1764,7 +1764,7 @@ lexer_construct_literal_object (parser_context_t *context_p, /**< context */
       && memcmp (source_p + 1, "rgument", 7) == 0)
   {
     context_p->lit_object.type = LEXER_LITERAL_OBJECT_ARGUMENTS;
-    if (!(context_p->status_flags & PARSER_ARGUMENTS_NOT_NEEDED))
+    if (!(context_p->status_flags & PARSER_ARGUMENTS_NOT_NEEDED) && literal_type != LEXER_STRING_LITERAL)
     {
       context_p->status_flags |= PARSER_ARGUMENTS_NEEDED | PARSER_LEXICAL_ENV_NEEDED;
       context_p->lit_object.literal_p->status_flags |= LEXER_FLAG_NO_REG_STORE;

tests/jerry/regression-test-issue-2656.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 obj = { "arguments": "foo" }
+
+function testcase ()
+{
+  return obj.hasOwnProperty ("arguments");
+}
+
+assert (testcase () === true);