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/*
* 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_ */
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