--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/prims/jvmtiTagMap.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2003-2005 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.
+ *
+ */
+
+// JvmtiTagMap
+
+#ifndef _JAVA_JVMTI_TAG_MAP_H_
+#define _JAVA_JVMTI_TAG_MAP_H_
+
+// forward references
+class JvmtiTagHashmap;
+class JvmtiTagHashmapEntry;
+class JvmtiTagHashmapEntryClosure;
+
+class JvmtiTagMap :  public CHeapObj {
+ private:
+
+  enum{
+    n_hashmaps = 2,                                 // encapsulates 2 hashmaps
+    max_free_entries = 4096                         // maximum number of free entries per env
+  };
+
+  // memory region for young generation
+  static MemRegion _young_gen;
+  static void get_young_generation();
+
+  JvmtiEnv*             _env;                       // the jvmti environment
+  Mutex                 _lock;                      // lock for this tag map
+  JvmtiTagHashmap*      _hashmap[n_hashmaps];       // the hashmaps
+
+  JvmtiTagHashmapEntry* _free_entries;              // free list for this environment
+  int _free_entries_count;                          // number of entries on the free list
+
+  // create a tag map
+  JvmtiTagMap(JvmtiEnv* env);
+
+  // accessors
+  inline Mutex* lock()                      { return &_lock; }
+  inline JvmtiEnv* env() const              { return _env; }
+
+  // rehash tags maps for generation start to end
+  void rehash(int start, int end);
+
+  // indicates if the object is in the young generation
+  static bool is_in_young(oop o);
+
+  // iterate over all entries in this tag map
+  void entry_iterate(JvmtiTagHashmapEntryClosure* closure);
+
+ public:
+
+  // indicates if this tag map is locked
+  bool is_locked()                          { return lock()->is_locked(); }
+
+  // return the appropriate hashmap for a given object
+  JvmtiTagHashmap* hashmap_for(oop o);
+
+  // create/destroy entries
+  JvmtiTagHashmapEntry* create_entry(jweak ref, jlong tag);
+  void destroy_entry(JvmtiTagHashmapEntry* entry);
+
+  // returns true if the hashmaps are empty
+  bool is_empty();
+
+  // return tag for the given environment
+  static JvmtiTagMap* tag_map_for(JvmtiEnv* env);
+
+  // destroy tag map
+  ~JvmtiTagMap();
+
+  // set/get tag
+  void set_tag(jobject obj, jlong tag);
+  jlong get_tag(jobject obj);
+
+  // deprecated heap iteration functions
+  void iterate_over_heap(jvmtiHeapObjectFilter object_filter,
+                         KlassHandle klass,
+                         jvmtiHeapObjectCallback heap_object_callback,
+                         const void* user_data);
+
+  void iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback,
+                                      jvmtiStackReferenceCallback stack_ref_callback,
+                                      jvmtiObjectReferenceCallback object_ref_callback,
+                                      const void* user_data);
+
+  void iterate_over_objects_reachable_from_object(jobject object,
+                                                  jvmtiObjectReferenceCallback object_reference_callback,
+                                                  const void* user_data);
+
+
+  // advanced (JVMTI 1.1) heap iteration functions
+  void iterate_through_heap(jint heap_filter,
+                            KlassHandle klass,
+                            const jvmtiHeapCallbacks* callbacks,
+                            const void* user_data);
+
+  void follow_references(jint heap_filter,
+                         KlassHandle klass,
+                         jobject initial_object,
+                         const jvmtiHeapCallbacks* callbacks,
+                         const void* user_data);
+
+  // get tagged objects
+  jvmtiError get_objects_with_tags(const jlong* tags, jint count,
+                                   jint* count_ptr, jobject** object_result_ptr,
+                                   jlong** tag_result_ptr);
+
+  // call post-GC to rehash the tag maps.
+  static void gc_epilogue(bool full);
+
+  // call after referencing processing has completed (CMS)
+  static void cms_ref_processing_epilogue();
+};
+
+#endif   /* _JAVA_JVMTI_TAG_MAP_H_ */