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src/share/vm/classfile/classLoader.hpp@c18cbe5936b8 (annotated)

src/share/vm/classfile/classLoader.hpp

Thu, 27 May 2010 19:08:38 -0700

author

trims

date

Thu, 27 May 2010 19:08:38 -0700

changeset 1907

c18cbe5936b8

parent 1383

89e0543e1737

child 2314

f95d63e2154a

permissions

-rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

duke@435	1	/*
trims@1907	2	* Copyright (c) 1997, 2009, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// The VM class loader.
duke@435	26	#include <sys/stat.h>
duke@435	27
duke@435	28
duke@435	29	// Meta-index (optional, to be able to skip opening boot classpath jar files)
duke@435	30	class MetaIndex: public CHeapObj {
duke@435	31	private:
duke@435	32	char** _meta_package_names;
duke@435	33	int _num_meta_package_names;
duke@435	34	public:
duke@435	35	MetaIndex(char** meta_package_names, int num_meta_package_names);
duke@435	36	~MetaIndex();
duke@435	37	bool may_contain(const char* class_name);
duke@435	38	};
duke@435	39
duke@435	40
duke@435	41	// Class path entry (directory or zip file)
duke@435	42
duke@435	43	class ClassPathEntry: public CHeapObj {
duke@435	44	private:
duke@435	45	ClassPathEntry* _next;
duke@435	46	public:
duke@435	47	// Next entry in class path
duke@435	48	ClassPathEntry* next() { return _next; }
duke@435	49	void set_next(ClassPathEntry* next) {
duke@435	50	// may have unlocked readers, so write atomically.
duke@435	51	OrderAccess::release_store_ptr(&_next, next);
duke@435	52	}
duke@435	53	virtual bool is_jar_file() = 0;
duke@435	54	virtual const char* name() = 0;
duke@435	55	virtual bool is_lazy();
duke@435	56	// Constructor
duke@435	57	ClassPathEntry();
duke@435	58	// Attempt to locate file_name through this class path entry.
duke@435	59	// Returns a class file parsing stream if successfull.
duke@435	60	virtual ClassFileStream* open_stream(const char* name) = 0;
duke@435	61	// Debugging
duke@435	62	NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
duke@435	63	NOT_PRODUCT(virtual bool is_rt_jar() = 0;)
duke@435	64	};
duke@435	65
duke@435	66
duke@435	67	class ClassPathDirEntry: public ClassPathEntry {
duke@435	68	private:
duke@435	69	char* _dir; // Name of directory
duke@435	70	public:
duke@435	71	bool is_jar_file() { return false; }
duke@435	72	const char* name() { return _dir; }
duke@435	73	ClassPathDirEntry(char* dir);
duke@435	74	ClassFileStream* open_stream(const char* name);
duke@435	75	// Debugging
duke@435	76	NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
duke@435	77	NOT_PRODUCT(bool is_rt_jar();)
duke@435	78	};
duke@435	79
duke@435	80
duke@435	81	// Type definitions for zip file and zip file entry
duke@435	82	typedef void* jzfile;
duke@435	83	typedef struct {
duke@435	84	char *name; /* entry name */
duke@435	85	jlong time; /* modification time */
duke@435	86	jlong size; /* size of uncompressed data */
duke@435	87	jlong csize; /* size of compressed data (zero if uncompressed) */
duke@435	88	jint crc; /* crc of uncompressed data */
duke@435	89	char *comment; /* optional zip file comment */
duke@435	90	jbyte *extra; /* optional extra data */
duke@435	91	jlong pos; /* position of LOC header (if negative) or data */
duke@435	92	} jzentry;
duke@435	93
duke@435	94
duke@435	95	class ClassPathZipEntry: public ClassPathEntry {
duke@435	96	private:
duke@435	97	jzfile* _zip; // The zip archive
duke@435	98	char* _zip_name; // Name of zip archive
duke@435	99	public:
duke@435	100	bool is_jar_file() { return true; }
duke@435	101	const char* name() { return _zip_name; }
duke@435	102	ClassPathZipEntry(jzfile* zip, const char* zip_name);
duke@435	103	~ClassPathZipEntry();
duke@435	104	ClassFileStream* open_stream(const char* name);
duke@435	105	void contents_do(void f(const char* name, void* context), void* context);
duke@435	106	// Debugging
duke@435	107	NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
duke@435	108	NOT_PRODUCT(void compile_the_world12(Handle loader, TRAPS);) // JDK 1.2 version
duke@435	109	NOT_PRODUCT(void compile_the_world13(Handle loader, TRAPS);) // JDK 1.3 version
duke@435	110	NOT_PRODUCT(bool is_rt_jar();)
duke@435	111	NOT_PRODUCT(bool is_rt_jar12();)
duke@435	112	NOT_PRODUCT(bool is_rt_jar13();)
duke@435	113	};
duke@435	114
duke@435	115
duke@435	116	// For lazier loading of boot class path entries
duke@435	117	class LazyClassPathEntry: public ClassPathEntry {
duke@435	118	private:
duke@435	119	char* _path; // dir or file
duke@435	120	struct stat _st;
duke@435	121	MetaIndex* _meta_index;
duke@435	122	volatile ClassPathEntry* _resolved_entry;
duke@435	123	ClassPathEntry* resolve_entry();
duke@435	124	public:
duke@435	125	bool is_jar_file();
duke@435	126	const char* name() { return _path; }
duke@435	127	LazyClassPathEntry(char* path, struct stat st);
duke@435	128	ClassFileStream* open_stream(const char* name);
duke@435	129	void set_meta_index(MetaIndex* meta_index) { _meta_index = meta_index; }
duke@435	130	virtual bool is_lazy();
duke@435	131	// Debugging
duke@435	132	NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
duke@435	133	NOT_PRODUCT(bool is_rt_jar();)
duke@435	134	};
duke@435	135
duke@435	136	class PackageHashtable;
duke@435	137	class PackageInfo;
duke@435	138	class HashtableBucket;
duke@435	139
duke@435	140	class ClassLoader: AllStatic {
duke@435	141	public:
duke@435	142	enum SomeConstants {
duke@435	143	package_hash_table_size = 31 // Number of buckets
duke@435	144	};
duke@435	145	private:
duke@435	146	friend class LazyClassPathEntry;
duke@435	147
duke@435	148	// Performance counters
duke@435	149	static PerfCounter* _perf_accumulated_time;
duke@435	150	static PerfCounter* _perf_classes_inited;
duke@435	151	static PerfCounter* _perf_class_init_time;
mchung@1310	152	static PerfCounter* _perf_class_init_selftime;
mchung@1310	153	static PerfCounter* _perf_classes_verified;
duke@435	154	static PerfCounter* _perf_class_verify_time;
mchung@1310	155	static PerfCounter* _perf_class_verify_selftime;
duke@435	156	static PerfCounter* _perf_classes_linked;
duke@435	157	static PerfCounter* _perf_class_link_time;
mchung@1310	158	static PerfCounter* _perf_class_link_selftime;
mchung@1310	159	static PerfCounter* _perf_class_parse_time;
mchung@1310	160	static PerfCounter* _perf_class_parse_selftime;
mchung@1310	161	static PerfCounter* _perf_sys_class_lookup_time;
mchung@1310	162	static PerfCounter* _perf_shared_classload_time;
mchung@1310	163	static PerfCounter* _perf_sys_classload_time;
mchung@1310	164	static PerfCounter* _perf_app_classload_time;
mchung@1310	165	static PerfCounter* _perf_app_classload_selftime;
mchung@1310	166	static PerfCounter* _perf_app_classload_count;
mchung@1310	167	static PerfCounter* _perf_define_appclasses;
mchung@1310	168	static PerfCounter* _perf_define_appclass_time;
mchung@1310	169	static PerfCounter* _perf_define_appclass_selftime;
mchung@1310	170	static PerfCounter* _perf_app_classfile_bytes_read;
mchung@1310	171	static PerfCounter* _perf_sys_classfile_bytes_read;
duke@435	172
duke@435	173	static PerfCounter* _sync_systemLoaderLockContentionRate;
duke@435	174	static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
duke@435	175	static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
duke@435	176	static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
duke@435	177	static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
duke@435	178
duke@435	179	static PerfCounter* _unsafe_defineClassCallCounter;
duke@435	180	static PerfCounter* _isUnsyncloadClass;
duke@435	181	static PerfCounter* _load_instance_class_failCounter;
duke@435	182
duke@435	183	// First entry in linked list of ClassPathEntry instances
duke@435	184	static ClassPathEntry* _first_entry;
duke@435	185	// Last entry in linked list of ClassPathEntry instances
duke@435	186	static ClassPathEntry* _last_entry;
duke@435	187	// Hash table used to keep track of loaded packages
duke@435	188	static PackageHashtable* _package_hash_table;
duke@435	189	static const char* _shared_archive;
duke@435	190
duke@435	191	// Hash function
duke@435	192	static unsigned int hash(const char *s, int n);
duke@435	193	// Returns the package file name corresponding to the specified package
duke@435	194	// or class name, or null if not found.
duke@435	195	static PackageInfo* lookup_package(const char *pkgname);
duke@435	196	// Adds a new package entry for the specified class or package name and
duke@435	197	// corresponding directory or jar file name.
duke@435	198	static bool add_package(const char *pkgname, int classpath_index, TRAPS);
duke@435	199
duke@435	200	// Initialization
duke@435	201	static void setup_meta_index();
duke@435	202	static void setup_bootstrap_search_path();
duke@435	203	static void load_zip_library();
duke@435	204	static void create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy);
duke@435	205
duke@435	206	// Canonicalizes path names, so strcmp will work properly. This is mainly
duke@435	207	// to avoid confusing the zip library
duke@435	208	static bool get_canonical_path(char* orig, char* out, int len);
duke@435	209	public:
duke@435	210	// Used by the kernel jvm.
duke@435	211	static void update_class_path_entry_list(const char *path,
duke@435	212	bool check_for_duplicates);
duke@435	213	static void print_bootclasspath();
duke@435	214
duke@435	215	// Timing
mchung@1310	216	static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
mchung@1310	217	static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
mchung@1310	218	static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
mchung@1310	219	static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; }
mchung@1310	220	static PerfCounter* perf_classes_verified() { return _perf_classes_verified; }
mchung@1310	221	static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
mchung@1310	222	static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; }
mchung@1310	223	static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
mchung@1310	224	static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
mchung@1310	225	static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; }
mchung@1310	226	static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; }
mchung@1310	227	static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; }
mchung@1310	228	static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; }
mchung@1310	229	static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; }
mchung@1310	230	static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; }
mchung@1310	231	static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; }
mchung@1310	232	static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; }
mchung@1310	233	static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; }
mchung@1310	234	static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; }
mchung@1310	235	static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; }
mchung@1310	236	static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
mchung@1310	237	static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
mchung@1310	238	static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
duke@435	239
duke@435	240	// Record how often system loader lock object is contended
duke@435	241	static PerfCounter* sync_systemLoaderLockContentionRate() {
duke@435	242	return _sync_systemLoaderLockContentionRate;
duke@435	243	}
duke@435	244
duke@435	245	// Record how often non system loader lock object is contended
duke@435	246	static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
duke@435	247	return _sync_nonSystemLoaderLockContentionRate;
duke@435	248	}
duke@435	249
duke@435	250	// Record how many calls to JVM_FindLoadedClass w/o holding a lock
duke@435	251	static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
duke@435	252	return _sync_JVMFindLoadedClassLockFreeCounter;
duke@435	253	}
duke@435	254
duke@435	255	// Record how many calls to JVM_DefineClass w/o holding a lock
duke@435	256	static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
duke@435	257	return _sync_JVMDefineClassLockFreeCounter;
duke@435	258	}
duke@435	259
duke@435	260	// Record how many calls to jni_DefineClass w/o holding a lock
duke@435	261	static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
duke@435	262	return _sync_JNIDefineClassLockFreeCounter;
duke@435	263	}
duke@435	264
duke@435	265	// Record how many calls to Unsafe_DefineClass
duke@435	266	static PerfCounter* unsafe_defineClassCallCounter() {
duke@435	267	return _unsafe_defineClassCallCounter;
duke@435	268	}
duke@435	269
duke@435	270	// Record how many times SystemDictionary::load_instance_class call
duke@435	271	// fails with linkageError when Unsyncloadclass flag is set.
duke@435	272	static PerfCounter* load_instance_class_failCounter() {
duke@435	273	return _load_instance_class_failCounter;
duke@435	274	}
duke@435	275
duke@435	276	// Load individual .class file
duke@435	277	static instanceKlassHandle load_classfile(symbolHandle h_name, TRAPS);
duke@435	278
duke@435	279	// If the specified package has been loaded by the system, then returns
duke@435	280	// the name of the directory or ZIP file that the package was loaded from.
duke@435	281	// Returns null if the package was not loaded.
duke@435	282	// Note: The specified name can either be the name of a class or package.
duke@435	283	// If a package name is specified, then it must be "/"-separator and also
duke@435	284	// end with a trailing "/".
duke@435	285	static oop get_system_package(const char* name, TRAPS);
duke@435	286
duke@435	287	// Returns an array of Java strings representing all of the currently
duke@435	288	// loaded system packages.
duke@435	289	// Note: The package names returned are "/"-separated and end with a
duke@435	290	// trailing "/".
duke@435	291	static objArrayOop get_system_packages(TRAPS);
duke@435	292
duke@435	293	// Initialization
duke@435	294	static void initialize();
duke@435	295	static void create_package_info_table();
duke@435	296	static void create_package_info_table(HashtableBucket *t, int length,
duke@435	297	int number_of_entries);
duke@435	298	static int compute_Object_vtable();
duke@435	299
duke@435	300	static ClassPathEntry* classpath_entry(int n) {
duke@435	301	ClassPathEntry* e = ClassLoader::_first_entry;
duke@435	302	while (--n >= 0) {
duke@435	303	assert(e != NULL, "Not that many classpath entries.");
duke@435	304	e = e->next();
duke@435	305	}
duke@435	306	return e;
duke@435	307	}
duke@435	308
duke@435	309	// Sharing dump and restore
duke@435	310	static void copy_package_info_buckets(char** top, char* end);
duke@435	311	static void copy_package_info_table(char** top, char* end);
duke@435	312
duke@435	313	// VM monitoring and management support
duke@435	314	static jlong classloader_time_ms();
duke@435	315	static jlong class_method_total_size();
duke@435	316	static jlong class_init_count();
duke@435	317	static jlong class_init_time_ms();
duke@435	318	static jlong class_verify_time_ms();
duke@435	319	static jlong class_link_count();
duke@435	320	static jlong class_link_time_ms();
duke@435	321
duke@435	322	// indicates if class path already contains a entry (exact match by name)
duke@435	323	static bool contains_entry(ClassPathEntry* entry);
duke@435	324
duke@435	325	// adds a class path list
duke@435	326	static void add_to_list(ClassPathEntry* new_entry);
duke@435	327
duke@435	328	// creates a class path zip entry (returns NULL if JAR file cannot be opened)
duke@435	329	static ClassPathZipEntry* create_class_path_zip_entry(const char *apath);
duke@435	330
duke@435	331	// Debugging
duke@435	332	static void verify() PRODUCT_RETURN;
duke@435	333
duke@435	334	// Force compilation of all methods in all classes in bootstrap class path (stress test)
duke@435	335	#ifndef PRODUCT
duke@435	336	private:
duke@435	337	static int _compile_the_world_counter;
duke@435	338	public:
duke@435	339	static void compile_the_world();
duke@435	340	static void compile_the_world_in(char* name, Handle loader, TRAPS);
duke@435	341	static int compile_the_world_counter() { return _compile_the_world_counter; }
duke@435	342	#endif //PRODUCT
duke@435	343	};
mchung@1310	344
mchung@1310	345	// PerfClassTraceTime is used to measure time for class loading related events.
mchung@1310	346	// This class tracks cumulative time and exclusive time for specific event types.
mchung@1310	347	// During the execution of one event, other event types (e.g. class loading and
mchung@1310	348	// resolution) as well as recursive calls of the same event type could happen.
mchung@1310	349	// Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
mchung@1310	350	// (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
mchung@1310	351	// instances have been created as multiple events are happening.
mchung@1310	352	class PerfClassTraceTime {
mchung@1310	353	public:
mchung@1310	354	enum {
mchung@1310	355	CLASS_LOAD = 0,
mchung@1310	356	PARSE_CLASS = 1,
mchung@1310	357	CLASS_LINK = 2,
mchung@1310	358	CLASS_VERIFY = 3,
mchung@1310	359	CLASS_CLINIT = 4,
mchung@1310	360	DEFINE_CLASS = 5,
mchung@1310	361	EVENT_TYPE_COUNT = 6
mchung@1310	362	};
mchung@1310	363	protected:
mchung@1310	364	// _t tracks time from initialization to destruction of this timer instance
mchung@1310	365	// including time for all other event types, and recursive calls of this type.
mchung@1310	366	// When a timer is called recursively, the elapsedTimer _t would not be used.
mchung@1310	367	elapsedTimer _t;
mchung@1310	368	PerfLongCounter* _timep;
mchung@1310	369	PerfLongCounter* _selftimep;
mchung@1310	370	PerfLongCounter* _eventp;
mchung@1310	371	// pointer to thread-local recursion counter and timer array
mchung@1310	372	// The thread_local timers track cumulative time for specific event types
mchung@1310	373	// exclusive of time for other event types, but including recursive calls
mchung@1310	374	// of the same type.
mchung@1310	375	int* _recursion_counters;
mchung@1310	376	elapsedTimer* _timers;
mchung@1310	377	int _event_type;
mchung@1310	378	int _prev_active_event;
mchung@1310	379
mchung@1310	380	public:
mchung@1310	381
mchung@1310	382	inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
mchung@1310	383	PerfLongCounter* selftimep, /* counter incremented with exclusive time */
mchung@1310	384	PerfLongCounter* eventp, /* event counter */
mchung@1310	385	int* recursion_counters, /* thread-local recursion counter array */
mchung@1310	386	elapsedTimer* timers, /* thread-local timer array */
mchung@1310	387	int type /* event type */ ) :
mchung@1310	388	_timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
mchung@1310	389	initialize();
mchung@1310	390	}
mchung@1310	391
mchung@1310	392	inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
mchung@1310	393	elapsedTimer* timers, /* thread-local timer array */
mchung@1310	394	int type /* event type */ ) :
mchung@1310	395	_timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
mchung@1310	396	initialize();
mchung@1310	397	}
mchung@1310	398
mchung@1310	399	void initialize() {
mchung@1310	400	if (!UsePerfData) return;
mchung@1310	401
mchung@1310	402	if (_eventp != NULL) {
mchung@1310	403	// increment the event counter
mchung@1310	404	_eventp->inc();
mchung@1310	405	}
mchung@1310	406
mchung@1310	407	// stop the current active thread-local timer to measure inclusive time
mchung@1310	408	_prev_active_event = -1;
mchung@1310	409	for (int i=0; i < EVENT_TYPE_COUNT; i++) {
mchung@1310	410	if (_timers[i].is_active()) {
mchung@1310	411	assert(_prev_active_event == -1, "should have only one active timer");
mchung@1310	412	_prev_active_event = i;
mchung@1310	413	_timers[i].stop();
mchung@1310	414	}
mchung@1310	415	}
mchung@1310	416
mchung@1310	417	if (_recursion_counters == NULL || (_recursion_counters[_event_type])++ == 0) {
mchung@1310	418	// start the inclusive timer if not recursively called
mchung@1310	419	_t.start();
mchung@1310	420	}
mchung@1310	421
mchung@1310	422	// start thread-local timer of the given event type
mchung@1310	423	if (!_timers[_event_type].is_active()) {
mchung@1310	424	_timers[_event_type].start();
mchung@1310	425	}
mchung@1310	426	}
mchung@1310	427
mchung@1310	428	inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
mchung@1310	429	inline void resume() { _t.start(); _timers[_event_type].start(); }
mchung@1310	430
mchung@1310	431	~PerfClassTraceTime() {
mchung@1310	432	if (!UsePerfData) return;
mchung@1310	433
mchung@1310	434	// stop the thread-local timer as the event completes
mchung@1310	435	// and resume the thread-local timer of the event next on the stack
mchung@1310	436	_timers[_event_type].stop();
mchung@1310	437	jlong selftime = _timers[_event_type].ticks();
mchung@1310	438
mchung@1310	439	if (_prev_active_event >= 0) {
mchung@1310	440	_timers[_prev_active_event].start();
mchung@1310	441	}
mchung@1310	442
mchung@1310	443	if (_recursion_counters != NULL && --(_recursion_counters[_event_type]) > 0) return;
mchung@1310	444
mchung@1310	445	// increment the counters only on the leaf call
mchung@1310	446	_t.stop();
mchung@1310	447	_timep->inc(_t.ticks());
mchung@1310	448	if (_selftimep != NULL) {
mchung@1310	449	_selftimep->inc(selftime);
mchung@1310	450	}
mchung@1310	451	// add all class loading related event selftime to the accumulated time counter
mchung@1310	452	ClassLoader::perf_accumulated_time()->inc(selftime);
mchung@1310	453
mchung@1310	454	// reset the timer
mchung@1310	455	_timers[_event_type].reset();
mchung@1310	456	}
mchung@1310	457	};
mchung@1310	458