--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/classListParser.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "classfile/classListParser.hpp"
+#include "runtime/os.hpp"
+#include "runtime/java.hpp"
+
+ClassListParser::ClassListParser(const char* file) {
+  _classlist_file = file;
+  _file = fopen(file, "r");
+  if (_file == NULL) {
+    char errmsg[JVM_MAXPATHLEN];
+    os::lasterror(errmsg, JVM_MAXPATHLEN);
+    vm_exit_during_initialization("Loading classlist failed", errmsg);
+  }
+}
+
+ClassListParser::~ClassListParser() {
+  if (_file) {
+    fclose(_file);
+  }
+}
+
+bool ClassListParser::parse_one_line() {
+  for (;;) {
+    if (fgets(_line, sizeof(_line), _file) == NULL) {
+      return false;
+    }
+    int line_len = (int)strlen(_line);
+    if (line_len > _max_allowed_line_len) {
+      tty->print_cr("input line too long (must be no longer than %d chars)", _max_allowed_line_len);
+      vm_exit_during_initialization("Loading classlist failed");
+    }
+    if (*_line == '#') { // comment
+      continue;
+    }
+    break;
+  }
+
+  // Remove trailing \r\n
+  _line[strcspn(_line, "\r\n")] = 0;
+  return true;
+}
+