Tue, 03 Sep 2019 06:57:35 +0100
8155951: VM crash in nsk/jvmti/RedefineClasses/StressRedefine: assert failed: Corrupted constant pool
8151066: assert(0 <= i && i < length()) failed: index out of bounds
Summary: lock classes for redefinition because constant pool merging isn't thread safe, use method constant pool because constant pool merging doesn't make equivalent cpCaches because of invokedynamic
Reviewed-by: shade, andrew
1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
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23 */
25 #ifndef SHARE_VM_RUNTIME_MUTEXLOCKER_HPP
26 #define SHARE_VM_RUNTIME_MUTEXLOCKER_HPP
28 #include "memory/allocation.hpp"
29 #include "runtime/mutex.hpp"
30 #ifdef TARGET_OS_FAMILY_linux
31 # include "os_linux.inline.hpp"
32 #endif
33 #ifdef TARGET_OS_FAMILY_solaris
34 # include "os_solaris.inline.hpp"
35 #endif
36 #ifdef TARGET_OS_FAMILY_windows
37 # include "os_windows.inline.hpp"
38 #endif
39 #ifdef TARGET_OS_FAMILY_aix
40 # include "os_aix.inline.hpp"
41 #endif
42 #ifdef TARGET_OS_FAMILY_bsd
43 # include "os_bsd.inline.hpp"
44 #endif
46 // Mutexes used in the VM.
48 extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code
49 extern Monitor* SystemDictionary_lock; // a lock on the system dictonary
50 extern Mutex* PackageTable_lock; // a lock on the class loader package table
51 extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access
52 extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer
53 extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment
54 extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles
55 extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list
56 extern Mutex* MemberNameTable_lock; // a lock on the MemberNameTable updates
57 extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers
58 extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers
59 extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in
60 extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data
61 extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list
62 extern Monitor* Heap_lock; // a lock on the heap
63 extern Mutex* ExpandHeap_lock; // a lock on expanding the heap
64 extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary
65 extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary
66 extern Mutex* VtableStubs_lock; // a lock on the VtableStubs
67 extern Mutex* SymbolTable_lock; // a lock on the symbol table
68 extern Mutex* StringTable_lock; // a lock on the interned string table
69 extern Monitor* StringDedupQueue_lock; // a lock on the string deduplication queue
70 extern Mutex* StringDedupTable_lock; // a lock on the string deduplication table
71 extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx
72 extern Mutex* MethodData_lock; // a lock on installation of method data
73 extern Mutex* RetData_lock; // a lock on installation of RetData inside method data
74 extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table
75 extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute
76 extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate
77 extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction
78 extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads
79 // (also used by Safepoints too to block threads creation/destruction)
80 extern Monitor* CGC_lock; // used for coordination between
81 // fore- & background GC threads.
82 extern Monitor* STS_lock; // used for joining/leaving SuspendibleThreadSet.
83 extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL
84 extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification
85 extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc
86 extern Monitor* CMark_lock; // used for concurrent mark thread coordination
87 extern Mutex* CMRegionStack_lock; // used for protecting accesses to the CM region stack
88 extern Mutex* SATB_Q_FL_lock; // Protects SATB Q
89 // buffer free list.
90 extern Monitor* SATB_Q_CBL_mon; // Protects SATB Q
91 // completed buffer queue.
92 extern Mutex* Shared_SATB_Q_lock; // Lock protecting SATB
93 // queue shared by
94 // non-Java threads.
96 extern Mutex* DirtyCardQ_FL_lock; // Protects dirty card Q
97 // buffer free list.
98 extern Monitor* DirtyCardQ_CBL_mon; // Protects dirty card Q
99 // completed buffer queue.
100 extern Mutex* Shared_DirtyCardQ_lock; // Lock protecting dirty card
101 // queue shared by
102 // non-Java threads.
103 // (see option ExplicitGCInvokesConcurrent)
104 extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops.
105 extern Mutex* EvacFailureStack_lock; // guards the evac failure scan stack
106 extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc)
107 extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued
108 extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization
109 extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated
110 extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics
111 extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays
112 extern Monitor* Terminator_lock; // a lock used to guard termination of the vm
113 extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks
114 extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm
115 extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing
116 extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread
117 extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles
118 extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates
119 extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues
121 #ifndef PRODUCT
122 extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe
123 #endif // PRODUCT
124 extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing
125 extern Mutex* Debug2_lock; // down synchronization related bugs!
126 extern Mutex* Debug3_lock;
128 extern Mutex* RawMonitor_lock;
129 extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data
130 extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources
131 extern Mutex* ParkerFreeList_lock;
132 extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches
134 extern Mutex* FreeList_lock; // protects the free region list during safepoints
135 extern Monitor* SecondaryFreeList_lock; // protects the secondary free region list
136 extern Mutex* OldSets_lock; // protects the old region sets
137 extern Monitor* RootRegionScan_lock; // used to notify that the CM threads have finished scanning the IM snapshot regions
138 extern Mutex* MMUTracker_lock; // protects the MMU
139 // tracker data structures
141 extern Mutex* Management_lock; // a lock used to serialize JVM management
142 extern Monitor* Service_lock; // a lock used for service thread operation
143 extern Monitor* PeriodicTask_lock; // protects the periodic task structure
144 extern Monitor* RedefineClasses_lock; // locks classes from parallel redefinition
146 #ifdef INCLUDE_TRACE
147 extern Mutex* JfrStacktrace_lock; // used to guard access to the JFR stacktrace table
148 extern Monitor* JfrMsg_lock; // protects JFR messaging
149 extern Mutex* JfrBuffer_lock; // protects JFR buffer operations
150 extern Mutex* JfrStream_lock; // protects JFR stream access
151 extern Mutex* JfrThreadGroups_lock; // protects JFR access to Thread Groups
152 #endif
154 #ifndef SUPPORTS_NATIVE_CX8
155 extern Mutex* UnsafeJlong_lock; // provides Unsafe atomic updates to jlongs on platforms that don't support cx8
156 #endif
158 // A MutexLocker provides mutual exclusion with respect to a given mutex
159 // for the scope which contains the locker. The lock is an OS lock, not
160 // an object lock, and the two do not interoperate. Do not use Mutex-based
161 // locks to lock on Java objects, because they will not be respected if a
162 // that object is locked using the Java locking mechanism.
163 //
164 // NOTE WELL!!
165 //
166 // See orderAccess.hpp. We assume throughout the VM that MutexLocker's
167 // and friends constructors do a fence, a lock and an acquire *in that
168 // order*. And that their destructors do a release and unlock, in *that*
169 // order. If their implementations change such that these assumptions
170 // are violated, a whole lot of code will break.
172 // Print all mutexes/monitors that are currently owned by a thread; called
173 // by fatal error handler.
174 void print_owned_locks_on_error(outputStream* st);
176 char *lock_name(Mutex *mutex);
178 class MutexLocker: StackObj {
179 private:
180 Monitor * _mutex;
181 public:
182 MutexLocker(Monitor * mutex) {
183 assert(mutex->rank() != Mutex::special,
184 "Special ranked mutex should only use MutexLockerEx");
185 _mutex = mutex;
186 _mutex->lock();
187 }
189 // Overloaded constructor passing current thread
190 MutexLocker(Monitor * mutex, Thread *thread) {
191 assert(mutex->rank() != Mutex::special,
192 "Special ranked mutex should only use MutexLockerEx");
193 _mutex = mutex;
194 _mutex->lock(thread);
195 }
197 ~MutexLocker() {
198 _mutex->unlock();
199 }
201 };
203 // for debugging: check that we're already owning this lock (or are at a safepoint)
204 #ifdef ASSERT
205 void assert_locked_or_safepoint(const Monitor * lock);
206 void assert_lock_strong(const Monitor * lock);
207 #else
208 #define assert_locked_or_safepoint(lock)
209 #define assert_lock_strong(lock)
210 #endif
212 // A MutexLockerEx behaves like a MutexLocker when its constructor is
213 // called with a Mutex. Unlike a MutexLocker, its constructor can also be
214 // called with NULL, in which case the MutexLockerEx is a no-op. There
215 // is also a corresponding MutexUnlockerEx. We want to keep the
216 // basic MutexLocker as fast as possible. MutexLockerEx can also lock
217 // without safepoint check.
219 class MutexLockerEx: public StackObj {
220 private:
221 Monitor * _mutex;
222 public:
223 MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
224 _mutex = mutex;
225 if (_mutex != NULL) {
226 assert(mutex->rank() > Mutex::special || no_safepoint_check,
227 "Mutexes with rank special or lower should not do safepoint checks");
228 if (no_safepoint_check)
229 _mutex->lock_without_safepoint_check();
230 else
231 _mutex->lock();
232 }
233 }
235 ~MutexLockerEx() {
236 if (_mutex != NULL) {
237 _mutex->unlock();
238 }
239 }
240 };
242 // A MonitorLockerEx is like a MutexLockerEx above, except it takes
243 // a possibly null Monitor, and allows wait/notify as well which are
244 // delegated to the underlying Monitor.
246 class MonitorLockerEx: public MutexLockerEx {
247 private:
248 Monitor * _monitor;
249 public:
250 MonitorLockerEx(Monitor* monitor,
251 bool no_safepoint_check = !Mutex::_no_safepoint_check_flag):
252 MutexLockerEx(monitor, no_safepoint_check),
253 _monitor(monitor) {
254 // Superclass constructor did locking
255 }
257 ~MonitorLockerEx() {
258 #ifdef ASSERT
259 if (_monitor != NULL) {
260 assert_lock_strong(_monitor);
261 }
262 #endif // ASSERT
263 // Superclass destructor will do unlocking
264 }
266 bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag,
267 long timeout = 0,
268 bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) {
269 if (_monitor != NULL) {
270 return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent);
271 }
272 return false;
273 }
275 bool notify_all() {
276 if (_monitor != NULL) {
277 return _monitor->notify_all();
278 }
279 return true;
280 }
282 bool notify() {
283 if (_monitor != NULL) {
284 return _monitor->notify();
285 }
286 return true;
287 }
288 };
292 // A GCMutexLocker is usually initialized with a mutex that is
293 // automatically acquired in order to do GC. The function that
294 // synchronizes using a GCMutexLocker may be called both during and between
295 // GC's. Thus, it must acquire the mutex if GC is not in progress, but not
296 // if GC is in progress (since the mutex is already held on its behalf.)
298 class GCMutexLocker: public StackObj {
299 private:
300 Monitor * _mutex;
301 bool _locked;
302 public:
303 GCMutexLocker(Monitor * mutex);
304 ~GCMutexLocker() { if (_locked) _mutex->unlock(); }
305 };
309 // A MutexUnlocker temporarily exits a previously
310 // entered mutex for the scope which contains the unlocker.
312 class MutexUnlocker: StackObj {
313 private:
314 Monitor * _mutex;
316 public:
317 MutexUnlocker(Monitor * mutex) {
318 _mutex = mutex;
319 _mutex->unlock();
320 }
322 ~MutexUnlocker() {
323 _mutex->lock();
324 }
325 };
327 // A MutexUnlockerEx temporarily exits a previously
328 // entered mutex for the scope which contains the unlocker.
330 class MutexUnlockerEx: StackObj {
331 private:
332 Monitor * _mutex;
333 bool _no_safepoint_check;
335 public:
336 MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
337 _mutex = mutex;
338 _no_safepoint_check = no_safepoint_check;
339 _mutex->unlock();
340 }
342 ~MutexUnlockerEx() {
343 if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) {
344 _mutex->lock_without_safepoint_check();
345 } else {
346 _mutex->lock();
347 }
348 }
349 };
351 #ifndef PRODUCT
352 //
353 // A special MutexLocker that allows:
354 // - reentrant locking
355 // - locking out of order
356 //
357 // Only too be used for verify code, where we can relaxe out dead-lock
358 // dection code a bit (unsafe, but probably ok). This code is NEVER to
359 // be included in a product version.
360 //
361 class VerifyMutexLocker: StackObj {
362 private:
363 Monitor * _mutex;
364 bool _reentrant;
365 public:
366 VerifyMutexLocker(Monitor * mutex) {
367 _mutex = mutex;
368 _reentrant = mutex->owned_by_self();
369 if (!_reentrant) {
370 // We temp. diable strict safepoint checking, while we require the lock
371 FlagSetting fs(StrictSafepointChecks, false);
372 _mutex->lock();
373 }
374 }
376 ~VerifyMutexLocker() {
377 if (!_reentrant) {
378 _mutex->unlock();
379 }
380 }
381 };
383 #endif
385 #endif // SHARE_VM_RUNTIME_MUTEXLOCKER_HPP