--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/fieldType.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 1997, 2016, 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/systemDictionary.hpp"
+#include "memory/oopFactory.hpp"
+#include "memory/resourceArea.hpp"
+#include "oops/oop.inline.hpp"
+#include "oops/typeArrayKlass.hpp"
+#include "runtime/fieldType.hpp"
+#include "runtime/signature.hpp"
+
+void FieldType::skip_optional_size(Symbol* signature, int* index) {
+  jchar c = signature->byte_at(*index);
+  while (c >= '0' && c <= '9') {
+    *index = *index + 1;
+    c = signature->byte_at(*index);
+  }
+}
+
+BasicType FieldType::basic_type(Symbol* signature) {
+  return char2type(signature->byte_at(0));
+}
+
+// Check if it is a valid array signature
+bool FieldType::is_valid_array_signature(Symbol* sig) {
+  assert(sig->utf8_length() > 1, "this should already have been checked");
+  assert(sig->byte_at(0) == '[', "this should already have been checked");
+  // The first character is already checked
+  int i = 1;
+  int len = sig->utf8_length();
+  // First skip all '['s
+  while(i < len - 1 && sig->byte_at(i) == '[') i++;
+
+  // Check type
+  switch(sig->byte_at(i)) {
+    case 'B': // T_BYTE
+    case 'C': // T_CHAR
+    case 'D': // T_DOUBLE
+    case 'F': // T_FLOAT
+    case 'I': // T_INT
+    case 'J': // T_LONG
+    case 'S': // T_SHORT
+    case 'Z': // T_BOOLEAN
+      // If it is an array, the type is the last character
+      return (i + 1 == len);
+    case 'L':
+      // If it is an object, the last character must be a ';'
+      return sig->byte_at(len - 1) == ';';
+  }
+
+  return false;
+}
+
+
+BasicType FieldType::get_array_info(Symbol* signature, FieldArrayInfo& fd, TRAPS) {
+  assert(basic_type(signature) == T_ARRAY, "must be array");
+  int index = 1;
+  int dim   = 1;
+  skip_optional_size(signature, &index);
+  while (signature->byte_at(index) == '[') {
+    index++;
+    dim++;
+    skip_optional_size(signature, &index);
+  }
+  ResourceMark rm;
+  char *element = signature->as_C_string() + index;
+  BasicType element_type = char2type(element[0]);
+  if (element_type == T_OBJECT) {
+    int len = (int)strlen(element);
+    assert(element[len-1] == ';', "last char should be a semicolon");
+    element[len-1] = '\0';        // chop off semicolon
+    fd._object_key = SymbolTable::new_symbol(element + 1, CHECK_(T_BYTE));
+  }
+  // Pass dimension back to caller
+  fd._dimension = dim;
+  return element_type;
+}