Mercurial > hg > graal-compiler
view src/share/vm/prims/jvmtiTagMap.hpp @ 616:4f360ec815ba
6720309: G1: don't synchronously update RSet during evacuation pauses
6720334: G1: don't update RSets of collection set regions during an evacuation pause
Summary: Introduced a deferred update mechanism for delaying the rset updates during the collection pause
Reviewed-by: apetrusenko, tonyp
author | iveresov |
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date | Fri, 06 Mar 2009 13:50:14 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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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_ */