Mon, 23 Jun 2008 14:11:12 -0700
6708714: Optimize long LShift on 32-bits x86
Summary: For small (1-3 bits) left long shifts in 32-bits VM use sets of add+addc instructions instead of shld+shl on new AMD cpus.
Reviewed-by: never
Contributed-by: shrinivas.joshi@amd.com
1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // Mutexes used in the VM.
27 extern Mutex* Patching_lock; // a lock used to guard code patching of compiled code
28 extern Monitor* SystemDictionary_lock; // a lock on the system dictonary
29 extern Mutex* PackageTable_lock; // a lock on the class loader package table
30 extern Mutex* CompiledIC_lock; // a lock used to guard compiled IC patching and access
31 extern Mutex* InlineCacheBuffer_lock; // a lock used to guard the InlineCacheBuffer
32 extern Mutex* VMStatistic_lock; // a lock used to guard statistics count increment
33 extern Mutex* JNIGlobalHandle_lock; // a lock on creating JNI global handles
34 extern Mutex* JNIHandleBlockFreeList_lock; // a lock on the JNI handle block free list
35 extern Mutex* JNICachedItableIndex_lock; // a lock on caching an itable index during JNI invoke
36 extern Mutex* JmethodIdCreation_lock; // a lock on creating JNI method identifiers
37 extern Mutex* JfieldIdCreation_lock; // a lock on creating JNI static field identifiers
38 extern Monitor* JNICritical_lock; // a lock used while entering and exiting JNI critical regions, allows GC to sometimes get in
39 extern Mutex* JvmtiThreadState_lock; // a lock on modification of JVMTI thread data
40 extern Monitor* JvmtiPendingEvent_lock; // a lock on the JVMTI pending events list
41 extern Mutex* Heap_lock; // a lock on the heap
42 extern Mutex* ExpandHeap_lock; // a lock on expanding the heap
43 extern Mutex* AdapterHandlerLibrary_lock; // a lock on the AdapterHandlerLibrary
44 extern Mutex* SignatureHandlerLibrary_lock; // a lock on the SignatureHandlerLibrary
45 extern Mutex* VtableStubs_lock; // a lock on the VtableStubs
46 extern Mutex* SymbolTable_lock; // a lock on the symbol table
47 extern Mutex* StringTable_lock; // a lock on the interned string table
48 extern Mutex* CodeCache_lock; // a lock on the CodeCache, rank is special, use MutexLockerEx
49 extern Mutex* MethodData_lock; // a lock on installation of method data
50 extern Mutex* RetData_lock; // a lock on installation of RetData inside method data
51 extern Mutex* DerivedPointerTableGC_lock; // a lock to protect the derived pointer table
52 extern Monitor* VMOperationQueue_lock; // a lock on queue of vm_operations waiting to execute
53 extern Monitor* VMOperationRequest_lock; // a lock on Threads waiting for a vm_operation to terminate
54 extern Monitor* Safepoint_lock; // a lock used by the safepoint abstraction
55 extern Monitor* Threads_lock; // a lock on the Threads table of active Java threads
56 // (also used by Safepoints too to block threads creation/destruction)
57 extern Monitor* CGC_lock; // used for coordination between
58 // fore- & background GC threads.
59 extern Mutex* STS_init_lock; // coordinate initialization of SuspendibleThreadSets.
60 extern Monitor* SLT_lock; // used in CMS GC for acquiring PLL
61 extern Monitor* iCMS_lock; // CMS incremental mode start/stop notification
62 extern Monitor* FullGCCount_lock; // in support of "concurrent" full gc
63 // (see option ExplicitGCInvokesConcurrent)
64 extern Mutex* ParGCRareEvent_lock; // Synchronizes various (rare) parallel GC ops.
65 extern Mutex* Compile_lock; // a lock held when Compilation is updating code (used to block CodeCache traversal, CHA updates, etc)
66 extern Monitor* MethodCompileQueue_lock; // a lock held when method compilations are enqueued, dequeued
67 #ifdef TIERED
68 extern Monitor* C1_lock; // a lock to ensure on single c1 compile is ever active
69 #endif // TIERED
70 extern Monitor* CompileThread_lock; // a lock held by compile threads during compilation system initialization
71 extern Mutex* CompileTaskAlloc_lock; // a lock held when CompileTasks are allocated
72 extern Mutex* CompileStatistics_lock; // a lock held when updating compilation statistics
73 extern Mutex* MultiArray_lock; // a lock used to guard allocation of multi-dim arrays
74 extern Monitor* Terminator_lock; // a lock used to guard termination of the vm
75 extern Monitor* BeforeExit_lock; // a lock used to guard cleanups and shutdown hooks
76 extern Monitor* Notify_lock; // a lock used to synchronize the start-up of the vm
77 extern Monitor* Interrupt_lock; // a lock used for condition variable mediated interrupt processing
78 extern Monitor* ProfileVM_lock; // a lock used for profiling the VMThread
79 extern Mutex* ProfilePrint_lock; // a lock used to serialize the printing of profiles
80 extern Mutex* ExceptionCache_lock; // a lock used to synchronize exception cache updates
81 extern Mutex* OsrList_lock; // a lock used to serialize access to OSR queues
83 #ifndef PRODUCT
84 extern Mutex* FullGCALot_lock; // a lock to make FullGCALot MT safe
85 #endif
86 extern Mutex* Debug1_lock; // A bunch of pre-allocated locks that can be used for tracing
87 extern Mutex* Debug2_lock; // down synchronization related bugs!
88 extern Mutex* Debug3_lock;
90 extern Mutex* RawMonitor_lock;
91 extern Mutex* PerfDataMemAlloc_lock; // a lock on the allocator for PerfData memory for performance data
92 extern Mutex* PerfDataManager_lock; // a long on access to PerfDataManager resources
93 extern Mutex* ParkerFreeList_lock;
94 extern Mutex* OopMapCacheAlloc_lock; // protects allocation of oop_map caches
96 extern Mutex* Management_lock; // a lock used to serialize JVM management
97 extern Monitor* LowMemory_lock; // a lock used for low memory detection
99 // A MutexLocker provides mutual exclusion with respect to a given mutex
100 // for the scope which contains the locker. The lock is an OS lock, not
101 // an object lock, and the two do not interoperate. Do not use Mutex-based
102 // locks to lock on Java objects, because they will not be respected if a
103 // that object is locked using the Java locking mechanism.
104 //
105 // NOTE WELL!!
106 //
107 // See orderAccess.hpp. We assume throughout the VM that MutexLocker's
108 // and friends constructors do a fence, a lock and an acquire *in that
109 // order*. And that their destructors do a release and unlock, in *that*
110 // order. If their implementations change such that these assumptions
111 // are violated, a whole lot of code will break.
113 // Print all mutexes/monitors that are currently owned by a thread; called
114 // by fatal error handler.
115 void print_owned_locks_on_error(outputStream* st);
117 char *lock_name(Mutex *mutex);
119 class MutexLocker: StackObj {
120 private:
121 Monitor * _mutex;
122 public:
123 MutexLocker(Monitor * mutex) {
124 assert(mutex->rank() != Mutex::special,
125 "Special ranked mutex should only use MutexLockerEx");
126 _mutex = mutex;
127 _mutex->lock();
128 }
130 // Overloaded constructor passing current thread
131 MutexLocker(Monitor * mutex, Thread *thread) {
132 assert(mutex->rank() != Mutex::special,
133 "Special ranked mutex should only use MutexLockerEx");
134 _mutex = mutex;
135 _mutex->lock(thread);
136 }
138 ~MutexLocker() {
139 _mutex->unlock();
140 }
142 };
144 // for debugging: check that we're already owning this lock (or are at a safepoint)
145 #ifdef ASSERT
146 void assert_locked_or_safepoint(const Monitor * lock);
147 void assert_lock_strong(const Monitor * lock);
148 #else
149 #define assert_locked_or_safepoint(lock)
150 #define assert_lock_strong(lock)
151 #endif
153 // A MutexLockerEx behaves like a MutexLocker when its constructor is
154 // called with a Mutex. Unlike a MutexLocker, its constructor can also be
155 // called with NULL, in which case the MutexLockerEx is a no-op. There
156 // is also a corresponding MutexUnlockerEx. We want to keep the
157 // basic MutexLocker as fast as possible. MutexLockerEx can also lock
158 // without safepoint check.
160 class MutexLockerEx: public StackObj {
161 private:
162 Monitor * _mutex;
163 public:
164 MutexLockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
165 _mutex = mutex;
166 if (_mutex != NULL) {
167 assert(mutex->rank() > Mutex::special || no_safepoint_check,
168 "Mutexes with rank special or lower should not do safepoint checks");
169 if (no_safepoint_check)
170 _mutex->lock_without_safepoint_check();
171 else
172 _mutex->lock();
173 }
174 }
176 ~MutexLockerEx() {
177 if (_mutex != NULL) {
178 _mutex->unlock();
179 }
180 }
181 };
183 // A MonitorLockerEx is like a MutexLockerEx above, except it takes
184 // a possibly null Monitor, and allows wait/notify as well which are
185 // delegated to the underlying Monitor.
187 class MonitorLockerEx: public MutexLockerEx {
188 private:
189 Monitor * _monitor;
190 public:
191 MonitorLockerEx(Monitor* monitor,
192 bool no_safepoint_check = !Mutex::_no_safepoint_check_flag):
193 MutexLockerEx(monitor, no_safepoint_check),
194 _monitor(monitor) {
195 // Superclass constructor did locking
196 }
198 ~MonitorLockerEx() {
199 #ifdef ASSERT
200 if (_monitor != NULL) {
201 assert_lock_strong(_monitor);
202 }
203 #endif // ASSERT
204 // Superclass destructor will do unlocking
205 }
207 bool wait(bool no_safepoint_check = !Mutex::_no_safepoint_check_flag,
208 long timeout = 0,
209 bool as_suspend_equivalent = !Mutex::_as_suspend_equivalent_flag) {
210 if (_monitor != NULL) {
211 return _monitor->wait(no_safepoint_check, timeout, as_suspend_equivalent);
212 }
213 return false;
214 }
216 bool notify_all() {
217 if (_monitor != NULL) {
218 return _monitor->notify_all();
219 }
220 return true;
221 }
223 bool notify() {
224 if (_monitor != NULL) {
225 return _monitor->notify();
226 }
227 return true;
228 }
229 };
233 // A GCMutexLocker is usually initialized with a mutex that is
234 // automatically acquired in order to do GC. The function that
235 // synchronizes using a GCMutexLocker may be called both during and between
236 // GC's. Thus, it must acquire the mutex if GC is not in progress, but not
237 // if GC is in progress (since the mutex is already held on its behalf.)
239 class GCMutexLocker: public StackObj {
240 private:
241 Monitor * _mutex;
242 bool _locked;
243 public:
244 GCMutexLocker(Monitor * mutex);
245 ~GCMutexLocker() { if (_locked) _mutex->unlock(); }
246 };
250 // A MutexUnlocker temporarily exits a previously
251 // entered mutex for the scope which contains the unlocker.
253 class MutexUnlocker: StackObj {
254 private:
255 Monitor * _mutex;
257 public:
258 MutexUnlocker(Monitor * mutex) {
259 _mutex = mutex;
260 _mutex->unlock();
261 }
263 ~MutexUnlocker() {
264 _mutex->lock();
265 }
266 };
268 // A MutexUnlockerEx temporarily exits a previously
269 // entered mutex for the scope which contains the unlocker.
271 class MutexUnlockerEx: StackObj {
272 private:
273 Monitor * _mutex;
274 bool _no_safepoint_check;
276 public:
277 MutexUnlockerEx(Monitor * mutex, bool no_safepoint_check = !Mutex::_no_safepoint_check_flag) {
278 _mutex = mutex;
279 _no_safepoint_check = no_safepoint_check;
280 _mutex->unlock();
281 }
283 ~MutexUnlockerEx() {
284 if (_no_safepoint_check == Mutex::_no_safepoint_check_flag) {
285 _mutex->lock_without_safepoint_check();
286 } else {
287 _mutex->lock();
288 }
289 }
290 };
292 #ifndef PRODUCT
293 //
294 // A special MutexLocker that allows:
295 // - reentrant locking
296 // - locking out of order
297 //
298 // Only too be used for verify code, where we can relaxe out dead-lock
299 // dection code a bit (unsafe, but probably ok). This code is NEVER to
300 // be included in a product version.
301 //
302 class VerifyMutexLocker: StackObj {
303 private:
304 Monitor * _mutex;
305 bool _reentrant;
306 public:
307 VerifyMutexLocker(Monitor * mutex) {
308 _mutex = mutex;
309 _reentrant = mutex->owned_by_self();
310 if (!_reentrant) {
311 // We temp. diable strict safepoint checking, while we require the lock
312 FlagSetting fs(StrictSafepointChecks, false);
313 _mutex->lock();
314 }
315 }
317 ~VerifyMutexLocker() {
318 if (!_reentrant) {
319 _mutex->unlock();
320 }
321 }
322 };
324 #endif