--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/runtime/fieldDescriptor.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 1997, 2017, 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.
+ *
+ */
+
+#ifndef SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
+#define SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP
+
+#include "oops/constantPool.hpp"
+#include "oops/symbol.hpp"
+#include "runtime/fieldType.hpp"
+#include "utilities/accessFlags.hpp"
+#include "utilities/constantTag.hpp"
+
+// A fieldDescriptor describes the attributes of a single field (instance or class variable).
+// It needs the class constant pool to work (because it only holds indices into the pool
+// rather than the actual info).
+
+class fieldDescriptor VALUE_OBJ_CLASS_SPEC {
+ private:
+  AccessFlags         _access_flags;
+  int                 _index; // the field index
+  constantPoolHandle  _cp;
+
+  // update the access_flags for the field in the klass
+  void update_klass_field_access_flag() {
+    InstanceKlass* ik = field_holder();
+    ik->field(index())->set_access_flags(_access_flags.as_short());
+  }
+
+  FieldInfo* field() const {
+    InstanceKlass* ik = field_holder();
+    return ik->field(_index);
+  }
+
+ public:
+  fieldDescriptor() {
+    DEBUG_ONLY(_index = badInt);
+  }
+  fieldDescriptor(InstanceKlass* ik, int index) {
+    DEBUG_ONLY(_index = badInt);
+    reinitialize(ik, index);
+  }
+  Symbol* name() const {
+    return field()->name(_cp());
+  }
+  Symbol* signature() const {
+    return field()->signature(_cp());
+  }
+  InstanceKlass* field_holder()   const    { return _cp->pool_holder(); }
+  ConstantPool* constants()       const    { return _cp(); }
+  AccessFlags access_flags()      const    { return _access_flags; }
+  oop loader()                    const;
+  // Offset (in words) of field from start of instanceOop / Klass*
+  int offset()                    const    { return field()->offset(); }
+  Symbol* generic_signature()     const;
+  int index()                     const    { return _index; }
+  AnnotationArray* annotations()  const;
+  AnnotationArray* type_annotations()  const;
+
+  // Initial field value
+  bool has_initial_value()        const    { return field()->initval_index() != 0; }
+  int initial_value_index()       const    { return field()->initval_index(); }
+  constantTag initial_value_tag() const;  // The tag will return true on one of is_int(), is_long(), is_single(), is_double()
+  jint int_initial_value()        const;
+  jlong long_initial_value()      const;
+  jfloat float_initial_value()    const;
+  jdouble double_initial_value()  const;
+  oop string_initial_value(TRAPS) const;
+
+  // Field signature type
+  BasicType field_type()          const    { return FieldType::basic_type(signature()); }
+
+  // Access flags
+  bool is_public()                const    { return access_flags().is_public(); }
+  bool is_private()               const    { return access_flags().is_private(); }
+  bool is_protected()             const    { return access_flags().is_protected(); }
+  bool is_package_private()       const    { return !is_public() && !is_private() && !is_protected(); }
+
+  bool is_static()                const    { return access_flags().is_static(); }
+  bool is_final()                 const    { return access_flags().is_final(); }
+  bool is_volatile()              const    { return access_flags().is_volatile(); }
+  bool is_transient()             const    { return access_flags().is_transient(); }
+
+  bool is_synthetic()             const    { return access_flags().is_synthetic(); }
+
+  bool is_field_access_watched()  const    { return access_flags().is_field_access_watched(); }
+  bool is_field_modification_watched() const
+                                           { return access_flags().is_field_modification_watched(); }
+  bool has_initialized_final_update() const { return access_flags().has_field_initialized_final_update(); }
+  bool has_generic_signature()    const    { return access_flags().field_has_generic_signature(); }
+
+  void set_is_field_access_watched(const bool value) {
+    _access_flags.set_is_field_access_watched(value);
+    update_klass_field_access_flag();
+  }
+
+  void set_is_field_modification_watched(const bool value) {
+    _access_flags.set_is_field_modification_watched(value);
+    update_klass_field_access_flag();
+  }
+
+  void set_has_initialized_final_update(const bool value) {
+    _access_flags.set_has_field_initialized_final_update(value);
+    update_klass_field_access_flag();
+  }
+
+  // Initialization
+  void reinitialize(InstanceKlass* ik, int index);
+
+  // Print
+  void print() { print_on(tty); }
+  void print_on(outputStream* st) const         PRODUCT_RETURN;
+  void print_on_for(outputStream* st, oop obj)  PRODUCT_RETURN;
+  void verify() const                           PRODUCT_RETURN;
+};
+
+#endif // SHARE_VM_RUNTIME_FIELDDESCRIPTOR_HPP