Fix unavailable source file handling in main_print_unhandled_exception (#4424)

This patch fixes #4403.

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

jerry-main/main-utils.c

@@ -323,9 +323,6 @@ main_print_unhandled_exception (jerry_value_t error_value) /**< error value */
 
       if (err_line != 0 && err_col > 0 && err_col < SYNTAX_ERROR_MAX_LINE_LENGTH)
       {
-        uint32_t curr_line = 1;
-        uint32_t pos = 0;
-
         /* Temporarily modify the error message, so we can use the path. */
         *path_str_end_p = '\0';
 
@@ -335,6 +332,11 @@ main_print_unhandled_exception (jerry_value_t error_value) /**< error value */
         /* Revert the error message. */
         *path_str_end_p = ':';
 
+        if (source_p != NULL)
+        {
+          uint32_t curr_line = 1;
+          uint32_t pos = 0;
+
           /* 2. seek and print */
           while (pos < source_size && curr_line < err_line)
           {
@@ -370,6 +372,7 @@ main_print_unhandled_exception (jerry_value_t error_value) /**< error value */
         }
       }
     }
+  }
 
   jerry_port_log (JERRY_LOG_LEVEL_ERROR, "%s\n", err_str_buf);
   jerry_release_value (err_str_val);

tests/jerry/fail/regression-test-issue-4403.js

@@ -0,0 +1,15 @@
+// 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.
+
+throw new SyntaxError("[0: 98, 1: 54, 8: false, 10: 21, foo: bar]");