Mercurial > hg > graal-jvmci-8
diff src/share/vm/prims/jvmtiTagMap.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | c18cbe5936b8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/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_ */