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src/share/vm/prims/jvmtiTagMap.hpp@e9be0e04635a (annotated)

src/share/vm/prims/jvmtiTagMap.hpp

Tue, 06 Jan 2009 07:05:05 -0800

author

jmasa

date

Tue, 06 Jan 2009 07:05:05 -0800

changeset 952

e9be0e04635a

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
Summary: Added safe_object_iterate() for use by JMapPerm.
Reviewed-by: tonyp

duke@435	1	/*
duke@435	2	* Copyright 2003-2005 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// JvmtiTagMap
duke@435	26
duke@435	27	#ifndef _JAVA_JVMTI_TAG_MAP_H_
duke@435	28	#define _JAVA_JVMTI_TAG_MAP_H_
duke@435	29
duke@435	30	// forward references
duke@435	31	class JvmtiTagHashmap;
duke@435	32	class JvmtiTagHashmapEntry;
duke@435	33	class JvmtiTagHashmapEntryClosure;
duke@435	34
duke@435	35	class JvmtiTagMap : public CHeapObj {
duke@435	36	private:
duke@435	37
duke@435	38	enum{
duke@435	39	n_hashmaps = 2, // encapsulates 2 hashmaps
duke@435	40	max_free_entries = 4096 // maximum number of free entries per env
duke@435	41	};
duke@435	42
duke@435	43	// memory region for young generation
duke@435	44	static MemRegion _young_gen;
duke@435	45	static void get_young_generation();
duke@435	46
duke@435	47	JvmtiEnv* _env; // the jvmti environment
duke@435	48	Mutex _lock; // lock for this tag map
duke@435	49	JvmtiTagHashmap* _hashmap[n_hashmaps]; // the hashmaps
duke@435	50
duke@435	51	JvmtiTagHashmapEntry* _free_entries; // free list for this environment
duke@435	52	int _free_entries_count; // number of entries on the free list
duke@435	53
duke@435	54	// create a tag map
duke@435	55	JvmtiTagMap(JvmtiEnv* env);
duke@435	56
duke@435	57	// accessors
duke@435	58	inline Mutex* lock() { return &_lock; }
duke@435	59	inline JvmtiEnv* env() const { return _env; }
duke@435	60
duke@435	61	// rehash tags maps for generation start to end
duke@435	62	void rehash(int start, int end);
duke@435	63
duke@435	64	// indicates if the object is in the young generation
duke@435	65	static bool is_in_young(oop o);
duke@435	66
duke@435	67	// iterate over all entries in this tag map
duke@435	68	void entry_iterate(JvmtiTagHashmapEntryClosure* closure);
duke@435	69
duke@435	70	public:
duke@435	71
duke@435	72	// indicates if this tag map is locked
duke@435	73	bool is_locked() { return lock()->is_locked(); }
duke@435	74
duke@435	75	// return the appropriate hashmap for a given object
duke@435	76	JvmtiTagHashmap* hashmap_for(oop o);
duke@435	77
duke@435	78	// create/destroy entries
duke@435	79	JvmtiTagHashmapEntry* create_entry(jweak ref, jlong tag);
duke@435	80	void destroy_entry(JvmtiTagHashmapEntry* entry);
duke@435	81
duke@435	82	// returns true if the hashmaps are empty
duke@435	83	bool is_empty();
duke@435	84
duke@435	85	// return tag for the given environment
duke@435	86	static JvmtiTagMap* tag_map_for(JvmtiEnv* env);
duke@435	87
duke@435	88	// destroy tag map
duke@435	89	~JvmtiTagMap();
duke@435	90
duke@435	91	// set/get tag
duke@435	92	void set_tag(jobject obj, jlong tag);
duke@435	93	jlong get_tag(jobject obj);
duke@435	94
duke@435	95	// deprecated heap iteration functions
duke@435	96	void iterate_over_heap(jvmtiHeapObjectFilter object_filter,
duke@435	97	KlassHandle klass,
duke@435	98	jvmtiHeapObjectCallback heap_object_callback,
duke@435	99	const void* user_data);
duke@435	100
duke@435	101	void iterate_over_reachable_objects(jvmtiHeapRootCallback heap_root_callback,
duke@435	102	jvmtiStackReferenceCallback stack_ref_callback,
duke@435	103	jvmtiObjectReferenceCallback object_ref_callback,
duke@435	104	const void* user_data);
duke@435	105
duke@435	106	void iterate_over_objects_reachable_from_object(jobject object,
duke@435	107	jvmtiObjectReferenceCallback object_reference_callback,
duke@435	108	const void* user_data);
duke@435	109
duke@435	110
duke@435	111	// advanced (JVMTI 1.1) heap iteration functions
duke@435	112	void iterate_through_heap(jint heap_filter,
duke@435	113	KlassHandle klass,
duke@435	114	const jvmtiHeapCallbacks* callbacks,
duke@435	115	const void* user_data);
duke@435	116
duke@435	117	void follow_references(jint heap_filter,
duke@435	118	KlassHandle klass,
duke@435	119	jobject initial_object,
duke@435	120	const jvmtiHeapCallbacks* callbacks,
duke@435	121	const void* user_data);
duke@435	122
duke@435	123	// get tagged objects
duke@435	124	jvmtiError get_objects_with_tags(const jlong* tags, jint count,
duke@435	125	jint* count_ptr, jobject** object_result_ptr,
duke@435	126	jlong** tag_result_ptr);
duke@435	127
duke@435	128	// call post-GC to rehash the tag maps.
duke@435	129	static void gc_epilogue(bool full);
duke@435	130
duke@435	131	// call after referencing processing has completed (CMS)
duke@435	132	static void cms_ref_processing_epilogue();
duke@435	133	};
duke@435	134
duke@435	135	#endif /* _JAVA_JVMTI_TAG_MAP_H_ */