--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/utilities/constantTag.hpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 1997, 2014, 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_UTILITIES_CONSTANTTAG_HPP
+#define SHARE_VM_UTILITIES_CONSTANTTAG_HPP
+
+#include "memory/allocation.hpp"
+#include "prims/jvm.h"
+
+// constant tags in Java .class files
+
+
+enum {
+  // See jvm.h for shared JVM_CONSTANT_XXX tags
+  // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
+  // Hotspot specific tags
+  JVM_CONSTANT_Invalid                  = 0,    // For bad value initialization
+  JVM_CONSTANT_InternalMin              = 100,  // First implementation tag (aside from bad value of course)
+  JVM_CONSTANT_UnresolvedClass          = 100,  // Temporary tag until actual use
+  JVM_CONSTANT_ClassIndex               = 101,  // Temporary tag while constructing constant pool
+  JVM_CONSTANT_StringIndex              = 102,  // Temporary tag while constructing constant pool
+  JVM_CONSTANT_UnresolvedClassInError   = 103,  // Error tag due to resolution error
+  JVM_CONSTANT_MethodHandleInError      = 104,  // Error tag due to resolution error
+  JVM_CONSTANT_MethodTypeInError        = 105,  // Error tag due to resolution error
+  JVM_CONSTANT_InternalMax              = 105   // Last implementation tag
+};
+
+
+class constantTag VALUE_OBJ_CLASS_SPEC {
+ private:
+  jbyte _tag;
+ public:
+  bool is_klass() const             { return _tag == JVM_CONSTANT_Class; }
+  bool is_field () const            { return _tag == JVM_CONSTANT_Fieldref; }
+  bool is_method() const            { return _tag == JVM_CONSTANT_Methodref; }
+  bool is_interface_method() const  { return _tag == JVM_CONSTANT_InterfaceMethodref; }
+  bool is_string() const            { return _tag == JVM_CONSTANT_String; }
+  bool is_int() const               { return _tag == JVM_CONSTANT_Integer; }
+  bool is_float() const             { return _tag == JVM_CONSTANT_Float; }
+  bool is_long() const              { return _tag == JVM_CONSTANT_Long; }
+  bool is_double() const            { return _tag == JVM_CONSTANT_Double; }
+  bool is_name_and_type() const     { return _tag == JVM_CONSTANT_NameAndType; }
+  bool is_utf8() const              { return _tag == JVM_CONSTANT_Utf8; }
+
+  bool is_invalid() const           { return _tag == JVM_CONSTANT_Invalid; }
+
+  bool is_unresolved_klass() const {
+    return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
+  }
+
+  bool is_unresolved_klass_in_error() const {
+    return _tag == JVM_CONSTANT_UnresolvedClassInError;
+  }
+
+  bool is_method_handle_in_error() const {
+    return _tag == JVM_CONSTANT_MethodHandleInError;
+  }
+  bool is_method_type_in_error() const {
+    return _tag == JVM_CONSTANT_MethodTypeInError;
+  }
+
+  bool is_klass_index() const       { return _tag == JVM_CONSTANT_ClassIndex; }
+  bool is_string_index() const      { return _tag == JVM_CONSTANT_StringIndex; }
+
+  bool is_klass_reference() const   { return is_klass_index() || is_unresolved_klass(); }
+  bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); }
+  bool is_field_or_method() const   { return is_field() || is_method() || is_interface_method(); }
+  bool is_symbol() const            { return is_utf8(); }
+
+  bool is_method_type() const              { return _tag == JVM_CONSTANT_MethodType; }
+  bool is_method_handle() const            { return _tag == JVM_CONSTANT_MethodHandle; }
+  bool is_invoke_dynamic() const           { return _tag == JVM_CONSTANT_InvokeDynamic; }
+
+  bool is_loadable_constant() const {
+    return ((_tag >= JVM_CONSTANT_Integer && _tag <= JVM_CONSTANT_String) ||
+            is_method_type() || is_method_handle() ||
+            is_unresolved_klass());
+  }
+
+  constantTag() {
+    _tag = JVM_CONSTANT_Invalid;
+  }
+  constantTag(jbyte tag) {
+    assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
+           (tag >= JVM_CONSTANT_MethodHandle && tag <= JVM_CONSTANT_InvokeDynamic) ||
+           (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
+    _tag = tag;
+  }
+
+  jbyte value() const                { return _tag; }
+  jbyte error_value() const;
+  jbyte non_error_value() const;
+
+  BasicType basic_type() const;        // if used with ldc, what kind of value gets pushed?
+
+  const char* internal_name() const;  // for error reporting
+
+  void print_on(outputStream* st) const PRODUCT_RETURN;
+};
+
+#endif // SHARE_VM_UTILITIES_CONSTANTTAG_HPP