--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/utilities/constantTag.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,86 @@
+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// 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_UnresolvedString         = 102,  // Temporary tag until actual use
+  JVM_CONSTANT_StringIndex              = 103,  // Temporary tag while constructing constant pool
+  JVM_CONSTANT_UnresolvedClassInError   = 104,  // Error tag due to resolution error
+  JVM_CONSTANT_InternalMax              = 104   // 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_klass_index() const       { return _tag == JVM_CONSTANT_ClassIndex; }
+  bool is_unresolved_string() const { return _tag == JVM_CONSTANT_UnresolvedString; }
+  bool is_string_index() const      { return _tag == JVM_CONSTANT_StringIndex; }
+
+  bool is_klass_reference() const   { return is_klass_index() || is_unresolved_klass(); }
+  bool is_field_or_method() const   { return is_field() || is_method() || is_interface_method(); }
+  bool is_symbol() const            { return is_utf8(); }
+
+  constantTag(jbyte tag) {
+    assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
+           (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
+    _tag = tag;
+  }
+
+  jbyte value()                      { return _tag; }
+
+  void print_on(outputStream* st) const PRODUCT_RETURN;
+};