Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.hpp @ 2126:db2b0f8c1cef
6814943: getcpool001 catches more than one JvmtiThreadState problem
Summary: Mark field volatile, use membars, and change access order to close race
Reviewed-by: dcubed, dholmes
author | kamg |
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date | Tue, 11 Jan 2011 10:06:00 -0500 |
parents | b1a2afa37ec4 |
children | d25d4ca69222 b92c45f2bc75 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP |
26 #define SHARE_VM_RUNTIME_THREAD_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/threadLocalAllocBuffer.hpp" | |
30 #include "oops/oop.hpp" | |
31 #include "prims/jni.h" | |
32 #include "prims/jvmtiExport.hpp" | |
33 #include "runtime/frame.hpp" | |
34 #include "runtime/javaFrameAnchor.hpp" | |
35 #include "runtime/jniHandles.hpp" | |
36 #include "runtime/mutexLocker.hpp" | |
37 #include "runtime/os.hpp" | |
38 #include "runtime/osThread.hpp" | |
39 #include "runtime/park.hpp" | |
40 #include "runtime/safepoint.hpp" | |
41 #include "runtime/stubRoutines.hpp" | |
42 #include "runtime/threadLocalStorage.hpp" | |
43 #include "runtime/unhandledOops.hpp" | |
44 #include "utilities/exceptions.hpp" | |
45 #include "utilities/top.hpp" | |
46 #ifndef SERIALGC | |
47 #include "gc_implementation/g1/dirtyCardQueue.hpp" | |
48 #include "gc_implementation/g1/satbQueue.hpp" | |
49 #endif | |
50 #ifdef ZERO | |
51 #ifdef TARGET_ARCH_zero | |
52 # include "stack_zero.hpp" | |
53 #endif | |
54 #endif | |
55 | |
0 | 56 class ThreadSafepointState; |
57 class ThreadProfiler; | |
58 | |
59 class JvmtiThreadState; | |
60 class JvmtiGetLoadedClassesClosure; | |
61 class ThreadStatistics; | |
62 class ConcurrentLocksDump; | |
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63 class ParkEvent; |
1878 | 64 class Parker; |
0 | 65 |
66 class ciEnv; | |
67 class CompileThread; | |
68 class CompileLog; | |
69 class CompileTask; | |
70 class CompileQueue; | |
71 class CompilerCounters; | |
72 class vframeArray; | |
73 | |
74 class DeoptResourceMark; | |
75 class jvmtiDeferredLocalVariableSet; | |
76 | |
77 class GCTaskQueue; | |
78 class ThreadClosure; | |
79 class IdealGraphPrinter; | |
80 | |
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81 class WorkerThread; |
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82 |
0 | 83 // Class hierarchy |
84 // - Thread | |
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85 // - NamedThread |
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86 // - VMThread |
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87 // - ConcurrentGCThread |
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88 // - WorkerThread |
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89 // - GangWorker |
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90 // - GCTaskThread |
0 | 91 // - JavaThread |
92 // - WatcherThread | |
93 | |
94 class Thread: public ThreadShadow { | |
95 friend class VMStructs; | |
96 private: | |
97 // Exception handling | |
98 // (Note: _pending_exception and friends are in ThreadShadow) | |
99 //oop _pending_exception; // pending exception for current thread | |
100 // const char* _exception_file; // file information for exception (debugging only) | |
101 // int _exception_line; // line information for exception (debugging only) | |
102 | |
103 // Support for forcing alignment of thread objects for biased locking | |
104 void* _real_malloc_address; | |
105 public: | |
106 void* operator new(size_t size); | |
107 void operator delete(void* p); | |
108 private: | |
109 | |
110 // *************************************************************** | |
111 // Suspend and resume support | |
112 // *************************************************************** | |
113 // | |
114 // VM suspend/resume no longer exists - it was once used for various | |
115 // things including safepoints but was deprecated and finally removed | |
116 // in Java 7. Because VM suspension was considered "internal" Java-level | |
117 // suspension was considered "external", and this legacy naming scheme | |
118 // remains. | |
119 // | |
120 // External suspend/resume requests come from JVM_SuspendThread, | |
121 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
122 // ResumeThread. External | |
123 // suspend requests cause _external_suspend to be set and external | |
124 // resume requests cause _external_suspend to be cleared. | |
125 // External suspend requests do not nest on top of other external | |
126 // suspend requests. The higher level APIs reject suspend requests | |
127 // for already suspended threads. | |
128 // | |
129 // The external_suspend | |
130 // flag is checked by has_special_runtime_exit_condition() and java thread | |
131 // will self-suspend when handle_special_runtime_exit_condition() is | |
132 // called. Most uses of the _thread_blocked state in JavaThreads are | |
133 // considered the same as being externally suspended; if the blocking | |
134 // condition lifts, the JavaThread will self-suspend. Other places | |
135 // where VM checks for external_suspend include: | |
136 // + mutex granting (do not enter monitors when thread is suspended) | |
137 // + state transitions from _thread_in_native | |
138 // | |
139 // In general, java_suspend() does not wait for an external suspend | |
140 // request to complete. When it returns, the only guarantee is that | |
141 // the _external_suspend field is true. | |
142 // | |
143 // wait_for_ext_suspend_completion() is used to wait for an external | |
144 // suspend request to complete. External suspend requests are usually | |
145 // followed by some other interface call that requires the thread to | |
146 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
147 // the interface that requires quiescence, we give the JavaThread a | |
148 // chance to self-suspend before we need it to be quiescent. This | |
149 // improves overall suspend/query performance. | |
150 // | |
151 // _suspend_flags controls the behavior of java_ suspend/resume. | |
152 // It must be set under the protection of SR_lock. Read from the flag is | |
153 // OK without SR_lock as long as the value is only used as a hint. | |
154 // (e.g., check _external_suspend first without lock and then recheck | |
155 // inside SR_lock and finish the suspension) | |
156 // | |
157 // _suspend_flags is also overloaded for other "special conditions" so | |
158 // that a single check indicates whether any special action is needed | |
159 // eg. for async exceptions. | |
160 // ------------------------------------------------------------------- | |
161 // Notes: | |
162 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
163 // but we still update its value to keep other part of the system (mainly | |
164 // JVMTI) happy. ThreadState is legacy code (see notes in | |
165 // osThread.hpp). | |
166 // | |
167 // 2. It would be more natural if set_external_suspend() is private and | |
168 // part of java_suspend(), but that probably would affect the suspend/query | |
169 // performance. Need more investigation on this. | |
170 // | |
171 | |
172 // suspend/resume lock: used for self-suspend | |
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173 Monitor* _SR_lock; |
0 | 174 |
175 protected: | |
176 enum SuspendFlags { | |
177 // NOTE: avoid using the sign-bit as cc generates different test code | |
178 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
179 | |
180 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
181 _ext_suspended = 0x40000000U, // thread has self-suspended | |
182 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
183 | |
184 _has_async_exception = 0x00000001U // there is a pending async exception | |
185 }; | |
186 | |
187 // various suspension related flags - atomically updated | |
188 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
189 volatile uint32_t _suspend_flags; | |
190 | |
191 private: | |
192 int _num_nested_signal; | |
193 | |
194 public: | |
195 void enter_signal_handler() { _num_nested_signal++; } | |
196 void leave_signal_handler() { _num_nested_signal--; } | |
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197 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
0 | 198 |
199 private: | |
200 // Debug tracing | |
201 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
202 | |
203 // Active_handles points to a block of handles | |
204 JNIHandleBlock* _active_handles; | |
205 | |
206 // One-element thread local free list | |
207 JNIHandleBlock* _free_handle_block; | |
208 | |
209 // Point to the last handle mark | |
210 HandleMark* _last_handle_mark; | |
211 | |
212 // The parity of the last strong_roots iteration in which this thread was | |
213 // claimed as a task. | |
214 jint _oops_do_parity; | |
215 | |
216 public: | |
217 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
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218 HandleMark* last_handle_mark() const { return _last_handle_mark; } |
0 | 219 private: |
220 | |
221 // debug support for checking if code does allow safepoints or not | |
222 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
223 // mutex, or blocking on an object synchronizer (Java locking). | |
224 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
225 // If !allow_allocation(), then an assertion failure will happen during allocation | |
226 // (Hence, !allow_safepoint() => !allow_allocation()). | |
227 // | |
228 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
229 // | |
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230 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
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231 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
0 | 232 |
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233 // Used by SkipGCALot class. |
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234 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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235 |
0 | 236 // Record when GC is locked out via the GC_locker mechanism |
237 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
238 | |
239 friend class No_Alloc_Verifier; | |
240 friend class No_Safepoint_Verifier; | |
241 friend class Pause_No_Safepoint_Verifier; | |
242 friend class ThreadLocalStorage; | |
243 friend class GC_locker; | |
244 | |
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245 ThreadLocalAllocBuffer _tlab; // Thread-local eden |
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246 jlong _allocated_bytes; // Cumulative number of bytes allocated on |
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247 // the Java heap |
0 | 248 |
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249 int _vm_operation_started_count; // VM_Operation support |
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250 int _vm_operation_completed_count; // VM_Operation support |
0 | 251 |
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252 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
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253 // is waiting to lock |
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254 bool _current_pending_monitor_is_from_java; // locking is from Java code |
0 | 255 |
256 // ObjectMonitor on which this thread called Object.wait() | |
257 ObjectMonitor* _current_waiting_monitor; | |
258 | |
259 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
260 public: | |
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261 ObjectMonitor* omFreeList; |
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262 int omFreeCount; // length of omFreeList |
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263 int omFreeProvision; // reload chunk size |
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264 ObjectMonitor* omInUseList; // SLL to track monitors in circulation |
1587 | 265 int omInUseCount; // length of omInUseList |
0 | 266 |
267 public: | |
268 enum { | |
269 is_definitely_current_thread = true | |
270 }; | |
271 | |
272 // Constructor | |
273 Thread(); | |
274 virtual ~Thread(); | |
275 | |
276 // initializtion | |
277 void initialize_thread_local_storage(); | |
278 | |
279 // thread entry point | |
280 virtual void run(); | |
281 | |
282 // Testers | |
283 virtual bool is_VM_thread() const { return false; } | |
284 virtual bool is_Java_thread() const { return false; } | |
285 virtual bool is_Compiler_thread() const { return false; } | |
286 virtual bool is_hidden_from_external_view() const { return false; } | |
287 virtual bool is_jvmti_agent_thread() const { return false; } | |
288 // True iff the thread can perform GC operations at a safepoint. | |
289 // Generally will be true only of VM thread and parallel GC WorkGang | |
290 // threads. | |
291 virtual bool is_GC_task_thread() const { return false; } | |
292 virtual bool is_Watcher_thread() const { return false; } | |
293 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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294 virtual bool is_Named_thread() const { return false; } |
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295 virtual bool is_Worker_thread() const { return false; } |
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296 |
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297 // Casts |
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298 virtual WorkerThread* as_Worker_thread() const { return NULL; } |
0 | 299 |
300 virtual char* name() const { return (char*)"Unknown thread"; } | |
301 | |
302 // Returns the current thread | |
303 static inline Thread* current(); | |
304 | |
305 // Common thread operations | |
306 static void set_priority(Thread* thread, ThreadPriority priority); | |
307 static ThreadPriority get_priority(const Thread* const thread); | |
308 static void start(Thread* thread); | |
309 static void interrupt(Thread* thr); | |
310 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
311 | |
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312 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
0 | 313 Monitor* SR_lock() const { return _SR_lock; } |
314 | |
315 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
316 | |
317 void set_suspend_flag(SuspendFlags f) { | |
318 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
319 uint32_t flags; | |
320 do { | |
321 flags = _suspend_flags; | |
322 } | |
323 while (Atomic::cmpxchg((jint)(flags | f), | |
324 (volatile jint*)&_suspend_flags, | |
325 (jint)flags) != (jint)flags); | |
326 } | |
327 void clear_suspend_flag(SuspendFlags f) { | |
328 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
329 uint32_t flags; | |
330 do { | |
331 flags = _suspend_flags; | |
332 } | |
333 while (Atomic::cmpxchg((jint)(flags & ~f), | |
334 (volatile jint*)&_suspend_flags, | |
335 (jint)flags) != (jint)flags); | |
336 } | |
337 | |
338 void set_has_async_exception() { | |
339 set_suspend_flag(_has_async_exception); | |
340 } | |
341 void clear_has_async_exception() { | |
342 clear_suspend_flag(_has_async_exception); | |
343 } | |
344 | |
345 // Support for Unhandled Oop detection | |
346 #ifdef CHECK_UNHANDLED_OOPS | |
347 private: | |
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348 UnhandledOops* _unhandled_oops; |
0 | 349 public: |
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350 UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
0 | 351 // Mark oop safe for gc. It may be stack allocated but won't move. |
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352 void allow_unhandled_oop(oop *op) { |
0 | 353 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
354 } | |
355 // Clear oops at safepoint so crashes point to unhandled oop violator | |
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356 void clear_unhandled_oops() { |
0 | 357 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
358 } | |
359 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
360 #endif // CHECK_UNHANDLED_OOPS | |
361 | |
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362 #ifndef PRODUCT |
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363 bool skip_gcalot() { return _skip_gcalot; } |
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364 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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365 #endif |
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366 |
0 | 367 public: |
368 // Installs a pending exception to be inserted later | |
369 static void send_async_exception(oop thread_oop, oop java_throwable); | |
370 | |
371 // Resource area | |
372 ResourceArea* resource_area() const { return _resource_area; } | |
373 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
374 | |
375 OSThread* osthread() const { return _osthread; } | |
376 void set_osthread(OSThread* thread) { _osthread = thread; } | |
377 | |
378 // JNI handle support | |
379 JNIHandleBlock* active_handles() const { return _active_handles; } | |
380 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
381 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
382 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
383 | |
384 // Internal handle support | |
385 HandleArea* handle_area() const { return _handle_area; } | |
386 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
387 | |
388 // Thread-Local Allocation Buffer (TLAB) support | |
389 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
390 void initialize_tlab() { | |
391 if (UseTLAB) { | |
392 tlab().initialize(); | |
393 } | |
394 } | |
395 | |
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396 jlong allocated_bytes() { return _allocated_bytes; } |
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397 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } |
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398 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } |
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399 jlong cooked_allocated_bytes() { |
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400 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes); |
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401 if (UseTLAB) { |
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402 size_t used_bytes = tlab().used_bytes(); |
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403 if ((ssize_t)used_bytes > 0) { |
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404 // More-or-less valid tlab. The load_acquire above should ensure |
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405 // that the result of the add is <= the instantaneous value |
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406 return allocated_bytes + used_bytes; |
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407 } |
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408 } |
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409 return allocated_bytes; |
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410 } |
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411 |
0 | 412 // VM operation support |
413 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
414 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
415 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
416 | |
417 // For tracking the heavyweight monitor the thread is pending on. | |
418 ObjectMonitor* current_pending_monitor() { | |
419 return _current_pending_monitor; | |
420 } | |
421 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
422 _current_pending_monitor = monitor; | |
423 } | |
424 void set_current_pending_monitor_is_from_java(bool from_java) { | |
425 _current_pending_monitor_is_from_java = from_java; | |
426 } | |
427 bool current_pending_monitor_is_from_java() { | |
428 return _current_pending_monitor_is_from_java; | |
429 } | |
430 | |
431 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
432 ObjectMonitor* current_waiting_monitor() { | |
433 return _current_waiting_monitor; | |
434 } | |
435 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
436 _current_waiting_monitor = monitor; | |
437 } | |
438 | |
439 // GC support | |
440 // Apply "f->do_oop" to all root oops in "this". | |
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441 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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442 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 443 |
444 // Handles the parallel case for the method below. | |
445 private: | |
446 bool claim_oops_do_par_case(int collection_parity); | |
447 public: | |
448 // Requires that "collection_parity" is that of the current strong roots | |
449 // iteration. If "is_par" is false, sets the parity of "this" to | |
450 // "collection_parity", and returns "true". If "is_par" is true, | |
451 // uses an atomic instruction to set the current threads parity to | |
452 // "collection_parity", if it is not already. Returns "true" iff the | |
453 // calling thread does the update, this indicates that the calling thread | |
454 // has claimed the thread's stack as a root groop in the current | |
455 // collection. | |
456 bool claim_oops_do(bool is_par, int collection_parity) { | |
457 if (!is_par) { | |
458 _oops_do_parity = collection_parity; | |
459 return true; | |
460 } else { | |
461 return claim_oops_do_par_case(collection_parity); | |
462 } | |
463 } | |
464 | |
465 // Sweeper support | |
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466 void nmethods_do(CodeBlobClosure* cf); |
0 | 467 |
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468 // Used by fast lock support |
0 | 469 virtual bool is_lock_owned(address adr) const; |
470 | |
471 // Check if address is in the stack of the thread (not just for locks). | |
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472 // Warning: the method can only be used on the running thread |
0 | 473 bool is_in_stack(address adr) const; |
474 | |
475 // Sets this thread as starting thread. Returns failure if thread | |
476 // creation fails due to lack of memory, too many threads etc. | |
477 bool set_as_starting_thread(); | |
478 | |
479 protected: | |
480 // OS data associated with the thread | |
481 OSThread* _osthread; // Platform-specific thread information | |
482 | |
483 // Thread local resource area for temporary allocation within the VM | |
484 ResourceArea* _resource_area; | |
485 | |
486 // Thread local handle area for allocation of handles within the VM | |
487 HandleArea* _handle_area; | |
488 | |
489 // Support for stack overflow handling, get_thread, etc. | |
490 address _stack_base; | |
491 size_t _stack_size; | |
492 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
493 int _lgrp_id; | |
494 | |
495 public: | |
496 // Stack overflow support | |
497 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
498 | |
499 void set_stack_base(address base) { _stack_base = base; } | |
500 size_t stack_size() const { return _stack_size; } | |
501 void set_stack_size(size_t size) { _stack_size = size; } | |
502 void record_stack_base_and_size(); | |
503 | |
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504 bool on_local_stack(address adr) const { |
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505 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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506 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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507 } |
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508 |
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509 uintptr_t self_raw_id() { return _self_raw_id; } |
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510 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } |
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511 |
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512 int lgrp_id() const { return _lgrp_id; } |
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513 void set_lgrp_id(int value) { _lgrp_id = value; } |
0 | 514 |
515 // Printing | |
516 void print_on(outputStream* st) const; | |
517 void print() const { print_on(tty); } | |
518 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
519 | |
520 // Debug-only code | |
521 | |
522 #ifdef ASSERT | |
523 private: | |
524 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
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525 Monitor* _owned_locks; |
0 | 526 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
527 // thus the friendship | |
528 friend class Mutex; | |
529 friend class Monitor; | |
530 | |
531 public: | |
532 void print_owned_locks_on(outputStream* st) const; | |
533 void print_owned_locks() const { print_owned_locks_on(tty); } | |
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534 Monitor* owned_locks() const { return _owned_locks; } |
0 | 535 bool owns_locks() const { return owned_locks() != NULL; } |
536 bool owns_locks_but_compiled_lock() const; | |
537 | |
538 // Deadlock detection | |
539 bool allow_allocation() { return _allow_allocation_count == 0; } | |
540 #endif | |
541 | |
542 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
543 | |
544 private: | |
545 volatile int _jvmti_env_iteration_count; | |
546 | |
547 public: | |
548 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
549 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
550 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
551 | |
552 // Code generation | |
553 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
554 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
555 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
556 | |
557 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
558 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
559 | |
560 #define TLAB_FIELD_OFFSET(name) \ | |
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561 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
0 | 562 |
563 TLAB_FIELD_OFFSET(start) | |
564 TLAB_FIELD_OFFSET(end) | |
565 TLAB_FIELD_OFFSET(top) | |
566 TLAB_FIELD_OFFSET(pf_top) | |
567 TLAB_FIELD_OFFSET(size) // desired_size | |
568 TLAB_FIELD_OFFSET(refill_waste_limit) | |
569 TLAB_FIELD_OFFSET(number_of_refills) | |
570 TLAB_FIELD_OFFSET(fast_refill_waste) | |
571 TLAB_FIELD_OFFSET(slow_allocations) | |
572 | |
573 #undef TLAB_FIELD_OFFSET | |
574 | |
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575 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } |
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576 |
0 | 577 public: |
578 volatile intptr_t _Stalled ; | |
579 volatile int _TypeTag ; | |
580 ParkEvent * _ParkEvent ; // for synchronized() | |
581 ParkEvent * _SleepEvent ; // for Thread.sleep | |
582 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
583 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
584 int NativeSyncRecursion ; // diagnostic | |
585 | |
586 volatile int _OnTrap ; // Resume-at IP delta | |
587 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
588 jint _hashStateX ; // thread-specific hashCode generator state | |
589 jint _hashStateY ; | |
590 jint _hashStateZ ; | |
591 void * _schedctl ; | |
592 | |
593 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
594 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
595 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
596 | |
597 volatile jint rng [4] ; // RNG for spin loop | |
598 | |
599 // Low-level leaf-lock primitives used to implement synchronization | |
600 // and native monitor-mutex infrastructure. | |
601 // Not for general synchronization use. | |
602 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
603 static void SpinRelease (volatile int * Lock) ; | |
604 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
605 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
606 static void muxRelease (volatile intptr_t * Lock) ; | |
607 }; | |
608 | |
609 // Inline implementation of Thread::current() | |
610 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
611 // startup. | |
612 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
613 // period. This is inlined in thread_<os_family>.inline.hpp. | |
614 | |
615 inline Thread* Thread::current() { | |
616 #ifdef ASSERT | |
617 // This function is very high traffic. Define PARANOID to enable expensive | |
618 // asserts. | |
619 #ifdef PARANOID | |
620 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
621 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
622 assert(t != NULL && !t->is_inside_signal_handler(), | |
623 "Don't use Thread::current() inside signal handler"); | |
624 #endif | |
625 #endif | |
626 Thread* thread = ThreadLocalStorage::thread(); | |
627 assert(thread != NULL, "just checking"); | |
628 return thread; | |
629 } | |
630 | |
631 // Name support for threads. non-JavaThread subclasses with multiple | |
632 // uniquely named instances should derive from this. | |
633 class NamedThread: public Thread { | |
634 friend class VMStructs; | |
635 enum { | |
636 max_name_len = 64 | |
637 }; | |
638 private: | |
639 char* _name; | |
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640 // log JavaThread being processed by oops_do |
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641 JavaThread* _processed_thread; |
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642 |
0 | 643 public: |
644 NamedThread(); | |
645 ~NamedThread(); | |
646 // May only be called once per thread. | |
647 void set_name(const char* format, ...); | |
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648 virtual bool is_Named_thread() const { return true; } |
0 | 649 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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650 JavaThread *processed_thread() { return _processed_thread; } |
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651 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
0 | 652 }; |
653 | |
654 // Worker threads are named and have an id of an assigned work. | |
655 class WorkerThread: public NamedThread { | |
656 private: | |
657 uint _id; | |
658 public: | |
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659 WorkerThread() : _id(0) { } |
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660 virtual bool is_Worker_thread() const { return true; } |
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661 |
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662 virtual WorkerThread* as_Worker_thread() const { |
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663 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); |
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664 return (WorkerThread*) this; |
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665 } |
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666 |
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667 void set_id(uint work_id) { _id = work_id; } |
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668 uint id() const { return _id; } |
0 | 669 }; |
670 | |
671 // A single WatcherThread is used for simulating timer interrupts. | |
672 class WatcherThread: public Thread { | |
673 friend class VMStructs; | |
674 public: | |
675 virtual void run(); | |
676 | |
677 private: | |
678 static WatcherThread* _watcher_thread; | |
679 | |
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680 volatile static bool _should_terminate; // updated without holding lock |
0 | 681 public: |
682 enum SomeConstants { | |
683 delay_interval = 10 // interrupt delay in milliseconds | |
684 }; | |
685 | |
686 // Constructor | |
687 WatcherThread(); | |
688 | |
689 // Tester | |
690 bool is_Watcher_thread() const { return true; } | |
691 | |
692 // Printing | |
693 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
694 void print_on(outputStream* st) const; | |
695 void print() const { print_on(tty); } | |
696 | |
697 // Returns the single instance of WatcherThread | |
698 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
699 | |
700 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
701 static void start(); | |
702 static void stop(); | |
703 }; | |
704 | |
705 | |
706 class CompilerThread; | |
707 | |
708 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
709 | |
710 class JavaThread: public Thread { | |
711 friend class VMStructs; | |
712 private: | |
713 JavaThread* _next; // The next thread in the Threads list | |
714 oop _threadObj; // The Java level thread object | |
715 | |
716 #ifdef ASSERT | |
717 private: | |
718 int _java_call_counter; | |
719 | |
720 public: | |
721 int java_call_counter() { return _java_call_counter; } | |
722 void inc_java_call_counter() { _java_call_counter++; } | |
723 void dec_java_call_counter() { | |
724 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
725 _java_call_counter--; | |
726 } | |
727 private: // restore original namespace restriction | |
728 #endif // ifdef ASSERT | |
729 | |
730 #ifndef PRODUCT | |
731 public: | |
732 enum { | |
733 jump_ring_buffer_size = 16 | |
734 }; | |
735 private: // restore original namespace restriction | |
736 #endif | |
737 | |
738 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
739 | |
740 ThreadFunction _entry_point; | |
741 | |
742 JNIEnv _jni_environment; | |
743 | |
744 // Deopt support | |
745 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
746 | |
747 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
748 // transition out of native | |
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749 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized |
0 | 750 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
751 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
752 // Because deoptimization is lazy we must save jvmti requests to set locals | |
753 // in compiled frames until we deoptimize and we have an interpreter frame. | |
754 // This holds the pointer to array (yeah like there might be more than one) of | |
755 // description of compiled vframes that have locals that need to be updated. | |
756 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
757 | |
758 // Handshake value for fixing 6243940. We need a place for the i2c | |
759 // adapter to store the callee methodOop. This value is NEVER live | |
760 // across a gc point so it does NOT have to be gc'd | |
761 // The handshake is open ended since we can't be certain that it will | |
762 // be NULLed. This is because we rarely ever see the race and end up | |
763 // in handle_wrong_method which is the backend of the handshake. See | |
764 // code in i2c adapters and handle_wrong_method. | |
765 | |
766 methodOop _callee_target; | |
767 | |
768 // Oop results of VM runtime calls | |
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769 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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770 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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771 |
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772 // See ReduceInitialCardMarks: this holds the precise space interval of |
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773 // the most recent slow path allocation for which compiled code has |
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774 // elided card-marks for performance along the fast-path. |
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775 MemRegion _deferred_card_mark; |
0 | 776 |
777 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
778 // allocated during deoptimization | |
779 // and by JNI_MonitorEnter/Exit | |
780 | |
781 // Async. requests support | |
782 enum AsyncRequests { | |
783 _no_async_condition = 0, | |
784 _async_exception, | |
785 _async_unsafe_access_error | |
786 }; | |
787 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
788 oop _pending_async_exception; | |
789 | |
790 // Safepoint support | |
791 public: // Expose _thread_state for SafeFetchInt() | |
792 volatile JavaThreadState _thread_state; | |
793 private: | |
794 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
795 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
796 | |
797 // JavaThread termination support | |
798 enum TerminatedTypes { | |
799 _not_terminated = 0xDEAD - 2, | |
800 _thread_exiting, // JavaThread::exit() has been called for this thread | |
801 _thread_terminated, // JavaThread is removed from thread list | |
802 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
803 // only VM_Exit can set _vm_exited | |
804 }; | |
805 | |
806 // In general a JavaThread's _terminated field transitions as follows: | |
807 // | |
808 // _not_terminated => _thread_exiting => _thread_terminated | |
809 // | |
810 // _vm_exited is a special value to cover the case of a JavaThread | |
811 // executing native code after the VM itself is terminated. | |
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812 volatile TerminatedTypes _terminated; |
0 | 813 // suspend/resume support |
814 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
815 jint _in_deopt_handler; // count of deoptimization | |
816 // handlers thread is in | |
817 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
818 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
819 // never locked) when throwing an exception. Used by interpreter only. | |
820 | |
821 // Flag to mark a JNI thread in the process of attaching - See CR 6404306 | |
822 // This flag is never set true other than at construction, and in that case | |
823 // is shortly thereafter set false | |
824 volatile bool _is_attaching; | |
825 | |
826 public: | |
827 // State of the stack guard pages for this thread. | |
828 enum StackGuardState { | |
829 stack_guard_unused, // not needed | |
830 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
831 stack_guard_enabled // enabled | |
832 }; | |
833 | |
834 private: | |
835 | |
836 StackGuardState _stack_guard_state; | |
837 | |
838 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
839 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
840 // code) | |
841 volatile oop _exception_oop; // Exception thrown in compiled code | |
842 volatile address _exception_pc; // PC where exception happened | |
843 volatile address _exception_handler_pc; // PC for handler of exception | |
844 volatile int _exception_stack_size; // Size of frame where exception happened | |
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845 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
0 | 846 |
847 // support for compilation | |
848 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
849 | |
850 // support for JNI critical regions | |
851 jint _jni_active_critical; // count of entries into JNI critical region | |
852 | |
853 // For deadlock detection. | |
854 int _depth_first_number; | |
855 | |
856 // JVMTI PopFrame support | |
857 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
858 int _popframe_condition; | |
859 | |
860 #ifndef PRODUCT | |
861 int _jmp_ring_index; | |
862 struct { | |
863 // We use intptr_t instead of address so debugger doesn't try and display strings | |
864 intptr_t _target; | |
865 intptr_t _instruction; | |
866 const char* _file; | |
867 int _line; | |
868 } _jmp_ring[ jump_ring_buffer_size ]; | |
869 #endif /* PRODUCT */ | |
870 | |
342 | 871 #ifndef SERIALGC |
872 // Support for G1 barriers | |
873 | |
874 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
875 // Set of all such queues. | |
876 static SATBMarkQueueSet _satb_mark_queue_set; | |
877 | |
878 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
879 // Set of all such queues. | |
880 static DirtyCardQueueSet _dirty_card_queue_set; | |
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881 |
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882 void flush_barrier_queues(); |
342 | 883 #endif // !SERIALGC |
884 | |
0 | 885 friend class VMThread; |
886 friend class ThreadWaitTransition; | |
887 friend class VM_Exit; | |
888 | |
889 void initialize(); // Initialized the instance variables | |
890 | |
891 public: | |
892 // Constructor | |
893 JavaThread(bool is_attaching = false); // for main thread and JNI attached threads | |
894 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); | |
895 ~JavaThread(); | |
896 | |
897 #ifdef ASSERT | |
898 // verify this JavaThread hasn't be published in the Threads::list yet | |
899 void verify_not_published(); | |
900 #endif | |
901 | |
902 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
903 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
904 _jni_environment.functions = functionTable; | |
905 } | |
906 struct JNINativeInterface_* get_jni_functions() { | |
907 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
908 } | |
909 | |
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910 // This function is called at thread creation to allow |
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911 // platform specific thread variables to be initialized. |
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912 void cache_global_variables(); |
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913 |
0 | 914 // Executes Shutdown.shutdown() |
915 void invoke_shutdown_hooks(); | |
916 | |
917 // Cleanup on thread exit | |
918 enum ExitType { | |
919 normal_exit, | |
920 jni_detach | |
921 }; | |
922 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
923 | |
924 void cleanup_failed_attach_current_thread(); | |
925 | |
926 // Testers | |
927 virtual bool is_Java_thread() const { return true; } | |
928 | |
929 // compilation | |
930 void set_is_compiling(bool f) { _is_compiling = f; } | |
931 bool is_compiling() const { return _is_compiling; } | |
932 | |
933 // Thread chain operations | |
934 JavaThread* next() const { return _next; } | |
935 void set_next(JavaThread* p) { _next = p; } | |
936 | |
937 // Thread oop. threadObj() can be NULL for initial JavaThread | |
938 // (or for threads attached via JNI) | |
939 oop threadObj() const { return _threadObj; } | |
940 void set_threadObj(oop p) { _threadObj = p; } | |
941 | |
942 ThreadPriority java_priority() const; // Read from threadObj() | |
943 | |
944 // Prepare thread and add to priority queue. If a priority is | |
945 // not specified, use the priority of the thread object. Threads_lock | |
946 // must be held while this function is called. | |
947 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
948 | |
949 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
950 address saved_exception_pc() { return _saved_exception_pc; } | |
951 | |
952 | |
953 ThreadFunction entry_point() const { return _entry_point; } | |
954 | |
955 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
956 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
957 | |
958 // Last frame anchor routines | |
959 | |
960 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
961 | |
962 // last_Java_sp | |
963 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
964 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
965 | |
966 // last_Java_pc | |
967 | |
968 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
969 | |
970 // Safepoint support | |
971 JavaThreadState thread_state() const { return _thread_state; } | |
972 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
973 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
974 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
975 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
976 | |
977 // thread has called JavaThread::exit() or is terminated | |
978 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
979 // thread is terminated (no longer on the threads list); we compare | |
980 // against the two non-terminated values so that a freed JavaThread | |
981 // will also be considered terminated. | |
982 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
983 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
984 // special for Threads::remove() which is static: | |
985 void set_terminated_value() { _terminated = _thread_terminated; } | |
986 void block_if_vm_exited(); | |
987 | |
988 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
989 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
990 | |
991 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
992 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
993 | |
994 | |
995 // Suspend/resume support for JavaThread | |
996 | |
997 private: | |
998 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
999 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
1000 | |
1001 public: | |
1002 void java_suspend(); | |
1003 void java_resume(); | |
1004 int java_suspend_self(); | |
1005 | |
1006 void check_and_wait_while_suspended() { | |
1007 assert(JavaThread::current() == this, "sanity check"); | |
1008 | |
1009 bool do_self_suspend; | |
1010 do { | |
1011 // were we externally suspended while we were waiting? | |
1012 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
1013 if (do_self_suspend) { | |
1014 // don't surprise the thread that suspended us by returning | |
1015 java_suspend_self(); | |
1016 set_suspend_equivalent(); | |
1017 } | |
1018 } while (do_self_suspend); | |
1019 } | |
1020 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
1021 // Check for async exception in addition to safepoint and suspend request. | |
1022 static void check_special_condition_for_native_trans(JavaThread *thread); | |
1023 | |
1024 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
1025 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
1026 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1027 // Warning: is_ext_suspend_completed() may temporarily drop the | |
1028 // SR_lock to allow the thread to reach a stable thread state if | |
1029 // it is currently in a transient thread state. | |
1030 return is_ext_suspend_completed(false /*!called_by_wait */, | |
1031 SuspendRetryDelay, bits); | |
1032 } | |
1033 | |
1034 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
1035 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
1036 // passed as the count and delay parameters. Experiments with specific | |
1037 // calls to wait_for_ext_suspend_completion() can be done by passing | |
1038 // other values in the code. Experiments with all calls can be done | |
1039 // via the appropriate -XX options. | |
1040 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
1041 | |
1042 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
1043 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
1044 | |
1045 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
1046 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
1047 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
1048 | |
1049 bool is_external_suspend() const { | |
1050 return (_suspend_flags & _external_suspend) != 0; | |
1051 } | |
1052 // Whenever a thread transitions from native to vm/java it must suspend | |
1053 // if external|deopt suspend is present. | |
1054 bool is_suspend_after_native() const { | |
1055 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
1056 } | |
1057 | |
1058 // external suspend request is completed | |
1059 bool is_ext_suspended() const { | |
1060 return (_suspend_flags & _ext_suspended) != 0; | |
1061 } | |
1062 | |
1063 bool is_external_suspend_with_lock() const { | |
1064 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1065 return is_external_suspend(); | |
1066 } | |
1067 | |
1068 // Special method to handle a pending external suspend request | |
1069 // when a suspend equivalent condition lifts. | |
1070 bool handle_special_suspend_equivalent_condition() { | |
1071 assert(is_suspend_equivalent(), | |
1072 "should only be called in a suspend equivalence condition"); | |
1073 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1074 bool ret = is_external_suspend(); | |
1075 if (!ret) { | |
1076 // not about to self-suspend so clear suspend equivalence | |
1077 clear_suspend_equivalent(); | |
1078 } | |
1079 // implied else: | |
1080 // We have a pending external suspend request so we leave the | |
1081 // suspend_equivalent flag set until java_suspend_self() sets | |
1082 // the ext_suspended flag and clears the suspend_equivalent | |
1083 // flag. This insures that wait_for_ext_suspend_completion() | |
1084 // will return consistent values. | |
1085 return ret; | |
1086 } | |
1087 | |
1088 // utility methods to see if we are doing some kind of suspension | |
1089 bool is_being_ext_suspended() const { | |
1090 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1091 return is_ext_suspended() || is_external_suspend(); | |
1092 } | |
1093 | |
1094 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
1095 | |
1096 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
1097 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
1098 | |
1099 // Thread.stop support | |
1100 void send_thread_stop(oop throwable); | |
1101 AsyncRequests clear_special_runtime_exit_condition() { | |
1102 AsyncRequests x = _special_runtime_exit_condition; | |
1103 _special_runtime_exit_condition = _no_async_condition; | |
1104 return x; | |
1105 } | |
1106 | |
1107 // Are any async conditions present? | |
1108 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
1109 | |
1110 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
1111 | |
1112 // these next two are also used for self-suspension and async exception support | |
1113 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
1114 | |
1115 // Return true if JavaThread has an asynchronous condition or | |
1116 // if external suspension is requested. | |
1117 bool has_special_runtime_exit_condition() { | |
1118 // We call is_external_suspend() last since external suspend should | |
1119 // be less common. Because we don't use is_external_suspend_with_lock | |
1120 // it is possible that we won't see an asynchronous external suspend | |
1121 // request that has just gotten started, i.e., SR_lock grabbed but | |
1122 // _external_suspend field change either not made yet or not visible | |
1123 // yet. However, this is okay because the request is asynchronous and | |
1124 // we will see the new flag value the next time through. It's also | |
1125 // possible that the external suspend request is dropped after | |
1126 // we have checked is_external_suspend(), we will recheck its value | |
1127 // under SR_lock in java_suspend_self(). | |
1128 return (_special_runtime_exit_condition != _no_async_condition) || | |
1129 is_external_suspend() || is_deopt_suspend(); | |
1130 } | |
1131 | |
1132 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
1133 | |
1134 void set_pending_async_exception(oop e) { | |
1135 _pending_async_exception = e; | |
1136 _special_runtime_exit_condition = _async_exception; | |
1137 set_has_async_exception(); | |
1138 } | |
1139 | |
1140 // Fast-locking support | |
1141 bool is_lock_owned(address adr) const; | |
1142 | |
1143 // Accessors for vframe array top | |
1144 // The linked list of vframe arrays are sorted on sp. This means when we | |
1145 // unpack the head must contain the vframe array to unpack. | |
1146 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
1147 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
1148 | |
1149 // Side structure for defering update of java frame locals until deopt occurs | |
1150 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
1151 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
1152 | |
1153 // These only really exist to make debugging deopt problems simpler | |
1154 | |
1155 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
1156 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
1157 | |
1158 // The special resourceMark used during deoptimization | |
1159 | |
1160 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
1161 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
1162 | |
1163 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
1164 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
1165 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
1166 | |
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1167 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1168 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1169 |
0 | 1170 methodOop callee_target() const { return _callee_target; } |
1171 void set_callee_target (methodOop x) { _callee_target = x; } | |
1172 | |
1173 // Oop results of vm runtime calls | |
1174 oop vm_result() const { return _vm_result; } | |
1175 void set_vm_result (oop x) { _vm_result = x; } | |
1176 | |
1177 oop vm_result_2() const { return _vm_result_2; } | |
1178 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
1179 | |
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1180 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1181 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1182 |
0 | 1183 // Exception handling for compiled methods |
1184 oop exception_oop() const { return _exception_oop; } | |
1185 int exception_stack_size() const { return _exception_stack_size; } | |
1186 address exception_pc() const { return _exception_pc; } | |
1187 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1188 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
0 | 1189 |
1190 void set_exception_oop(oop o) { _exception_oop = o; } | |
1191 void set_exception_pc(address a) { _exception_pc = a; } | |
1192 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
1193 void set_exception_stack_size(int size) { _exception_stack_size = size; } | |
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1194 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
0 | 1195 |
1196 // Stack overflow support | |
1197 inline size_t stack_available(address cur_sp); | |
1198 address stack_yellow_zone_base() | |
1199 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
1200 size_t stack_yellow_zone_size() | |
1201 { return StackYellowPages * os::vm_page_size(); } | |
1202 address stack_red_zone_base() | |
1203 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
1204 size_t stack_red_zone_size() | |
1205 { return StackRedPages * os::vm_page_size(); } | |
1206 bool in_stack_yellow_zone(address a) | |
1207 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
1208 bool in_stack_red_zone(address a) | |
1209 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
1210 | |
1211 void create_stack_guard_pages(); | |
1212 void remove_stack_guard_pages(); | |
1213 | |
1214 void enable_stack_yellow_zone(); | |
1215 void disable_stack_yellow_zone(); | |
1216 void enable_stack_red_zone(); | |
1217 void disable_stack_red_zone(); | |
1218 | |
1219 inline bool stack_yellow_zone_disabled(); | |
1220 inline bool stack_yellow_zone_enabled(); | |
1221 | |
1222 // Attempt to reguard the stack after a stack overflow may have occurred. | |
1223 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
1224 // pages are already guarded, or (c) the pages were successfully reguarded. | |
1225 // Returns false if there is not enough stack space to reguard the pages, in | |
1226 // which case the caller should unwind a frame and try again. The argument | |
1227 // should be the caller's (approximate) sp. | |
1228 bool reguard_stack(address cur_sp); | |
1229 // Similar to above but see if current stackpoint is out of the guard area | |
1230 // and reguard if possible. | |
1231 bool reguard_stack(void); | |
1232 | |
1233 // Misc. accessors/mutators | |
1234 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
1235 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
1236 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
1237 | |
1238 #ifndef PRODUCT | |
1239 void record_jump(address target, address instr, const char* file, int line); | |
1240 #endif /* PRODUCT */ | |
1241 | |
1242 // For assembly stub generation | |
1243 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
1244 #ifndef PRODUCT | |
1245 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
1246 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
1247 #endif /* PRODUCT */ | |
1248 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
1249 static ByteSize last_Java_sp_offset() { | |
1250 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
1251 } | |
1252 static ByteSize last_Java_pc_offset() { | |
1253 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
1254 } | |
1255 static ByteSize frame_anchor_offset() { | |
1256 return byte_offset_of(JavaThread, _anchor); | |
1257 } | |
1258 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
1259 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
1260 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
1261 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
1262 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
1263 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
1264 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
1265 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
1266 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
1267 static ByteSize exception_stack_size_offset() { return byte_offset_of(JavaThread, _exception_stack_size); } | |
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1268 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
0 | 1269 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
1270 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
1271 | |
1272 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1273 static ByteSize should_post_on_exceptions_flag_offset() { |
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1274 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1275 } |
0 | 1276 |
342 | 1277 #ifndef SERIALGC |
1278 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
1279 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
1280 #endif // !SERIALGC | |
1281 | |
0 | 1282 // Returns the jni environment for this thread |
1283 JNIEnv* jni_environment() { return &_jni_environment; } | |
1284 | |
1285 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
1286 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
1287 // Only return NULL if thread is off the thread list; starting to | |
1288 // exit should not return NULL. | |
1289 if (thread_from_jni_env->is_terminated()) { | |
1290 thread_from_jni_env->block_if_vm_exited(); | |
1291 return NULL; | |
1292 } else { | |
1293 return thread_from_jni_env; | |
1294 } | |
1295 } | |
1296 | |
1297 // JNI critical regions. These can nest. | |
1298 bool in_critical() { return _jni_active_critical > 0; } | |
1299 void enter_critical() { assert(Thread::current() == this, | |
1300 "this must be current thread"); | |
1301 _jni_active_critical++; } | |
1302 void exit_critical() { assert(Thread::current() == this, | |
1303 "this must be current thread"); | |
1304 _jni_active_critical--; | |
1305 assert(_jni_active_critical >= 0, | |
1306 "JNI critical nesting problem?"); } | |
1307 | |
1308 // For deadlock detection | |
1309 int depth_first_number() { return _depth_first_number; } | |
1310 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
1311 | |
1312 private: | |
1313 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
1314 | |
1315 public: | |
1316 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
1317 void add_monitor_chunk(MonitorChunk* chunk); | |
1318 void remove_monitor_chunk(MonitorChunk* chunk); | |
1319 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
1320 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
1321 void dec_in_deopt_handler() { | |
1322 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
1323 if (_in_deopt_handler > 0) { // robustness | |
1324 _in_deopt_handler--; | |
1325 } | |
1326 } | |
1327 | |
1328 private: | |
1329 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
1330 | |
1331 public: | |
1332 | |
1333 // Frame iteration; calls the function f for all frames on the stack | |
1334 void frames_do(void f(frame*, const RegisterMap*)); | |
1335 | |
1336 // Memory operations | |
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1337 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1338 |
1339 // Sweeper operations | |
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1340 void nmethods_do(CodeBlobClosure* cf); |
0 | 1341 |
1342 // Memory management operations | |
1343 void gc_epilogue(); | |
1344 void gc_prologue(); | |
1345 | |
1346 // Misc. operations | |
1347 char* name() const { return (char*)get_thread_name(); } | |
1348 void print_on(outputStream* st) const; | |
1349 void print() const { print_on(tty); } | |
1350 void print_value(); | |
1351 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
1352 void print_thread_state() const PRODUCT_RETURN; | |
1353 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
1354 void verify(); | |
1355 const char* get_thread_name() const; | |
1356 private: | |
1357 // factor out low-level mechanics for use in both normal and error cases | |
1358 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
1359 public: | |
1360 const char* get_threadgroup_name() const; | |
1361 const char* get_parent_name() const; | |
1362 | |
1363 // Accessing frames | |
1364 frame last_frame() { | |
1365 _anchor.make_walkable(this); | |
1366 return pd_last_frame(); | |
1367 } | |
1368 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
1369 | |
1370 // Returns method at 'depth' java or native frames down the stack | |
1371 // Used for security checks | |
1372 klassOop security_get_caller_class(int depth); | |
1373 | |
1374 // Print stack trace in external format | |
1375 void print_stack_on(outputStream* st); | |
1376 void print_stack() { print_stack_on(tty); } | |
1377 | |
1378 // Print stack traces in various internal formats | |
1379 void trace_stack() PRODUCT_RETURN; | |
1380 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
1381 void trace_frames() PRODUCT_RETURN; | |
1382 | |
1383 // Returns the number of stack frames on the stack | |
1384 int depth() const; | |
1385 | |
1386 // Function for testing deoptimization | |
1387 void deoptimize(); | |
1388 void make_zombies(); | |
1389 | |
1390 void deoptimized_wrt_marked_nmethods(); | |
1391 | |
1392 // Profiling operation (see fprofile.cpp) | |
1393 public: | |
1394 bool profile_last_Java_frame(frame* fr); | |
1395 | |
1396 private: | |
1397 ThreadProfiler* _thread_profiler; | |
1398 private: | |
1399 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
1400 friend class FlatProfilerTask; // uses get_thread_profiler. | |
1401 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
1402 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
1403 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
1404 ThreadProfiler* result = _thread_profiler; | |
1405 _thread_profiler = tp; | |
1406 return result; | |
1407 } | |
1408 | |
1409 // Static operations | |
1410 public: | |
1411 // Returns the running thread as a JavaThread | |
1412 static inline JavaThread* current(); | |
1413 | |
1414 // Returns the active Java thread. Do not use this if you know you are calling | |
1415 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
1416 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
1417 // operation. You may not want that either. | |
1418 static JavaThread* active(); | |
1419 | |
1420 inline CompilerThread* as_CompilerThread(); | |
1421 | |
1422 public: | |
1423 virtual void run(); | |
1424 void thread_main_inner(); | |
1425 | |
1426 private: | |
1427 // PRIVILEGED STACK | |
1428 PrivilegedElement* _privileged_stack_top; | |
1429 GrowableArray<oop>* _array_for_gc; | |
1430 public: | |
1431 | |
1432 // Returns the privileged_stack information. | |
1433 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
1434 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
1435 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
1436 | |
1437 public: | |
1438 // Thread local information maintained by JVMTI. | |
1439 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
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1440 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1441 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1442 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1443 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1444 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1445 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1446 // the specified JavaThread is exiting. |
0 | 1447 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
1448 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
1449 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
1450 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
1451 | |
1452 // JVMTI PopFrame support | |
1453 // Setting and clearing popframe_condition | |
1454 // All of these enumerated values are bits. popframe_pending | |
1455 // indicates that a PopFrame() has been requested and not yet been | |
1456 // completed. popframe_processing indicates that that PopFrame() is in | |
1457 // the process of being completed. popframe_force_deopt_reexecution_bit | |
1458 // indicates that special handling is required when returning to a | |
1459 // deoptimized caller. | |
1460 enum PopCondition { | |
1461 popframe_inactive = 0x00, | |
1462 popframe_pending_bit = 0x01, | |
1463 popframe_processing_bit = 0x02, | |
1464 popframe_force_deopt_reexecution_bit = 0x04 | |
1465 }; | |
1466 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
1467 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
1468 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
1469 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
1470 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
1471 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
1472 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
1473 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
1474 #ifdef CC_INTERP | |
1475 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
1476 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
1477 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
1478 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
1479 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
1480 #endif | |
1481 | |
1482 private: | |
1483 // Saved incoming arguments to popped frame. | |
1484 // Used only when popped interpreted frame returns to deoptimized frame. | |
1485 void* _popframe_preserved_args; | |
1486 int _popframe_preserved_args_size; | |
1487 | |
1488 public: | |
1489 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
1490 void* popframe_preserved_args(); | |
1491 ByteSize popframe_preserved_args_size(); | |
1492 WordSize popframe_preserved_args_size_in_words(); | |
1493 void popframe_free_preserved_args(); | |
1494 | |
1495 | |
1496 private: | |
1497 JvmtiThreadState *_jvmti_thread_state; | |
1498 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
1499 | |
1500 // Used by the interpreter in fullspeed mode for frame pop, method | |
1501 // entry, method exit and single stepping support. This field is | |
1502 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
1503 // It can be set to zero asynchronously (i.e., without a VM operation | |
1504 // or a lock) so we have to be very careful. | |
1505 int _interp_only_mode; | |
1506 | |
1507 public: | |
1508 // used by the interpreter for fullspeed debugging support (see above) | |
1509 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
1510 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
1511 int get_interp_only_mode() { return _interp_only_mode; } | |
1512 void increment_interp_only_mode() { ++_interp_only_mode; } | |
1513 void decrement_interp_only_mode() { --_interp_only_mode; } | |
1514 | |
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1515 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1516 // if this is false, we can avoid deoptimizing when events are thrown |
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1517 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1518 private: |
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1519 int _should_post_on_exceptions_flag; |
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1520 |
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1521 public: |
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1522 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1523 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1524 |
0 | 1525 private: |
1526 ThreadStatistics *_thread_stat; | |
1527 | |
1528 public: | |
1529 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
1530 | |
1531 // Return a blocker object for which this thread is blocked parking. | |
1532 oop current_park_blocker(); | |
1533 | |
1534 private: | |
1535 static size_t _stack_size_at_create; | |
1536 | |
1537 public: | |
1538 static inline size_t stack_size_at_create(void) { | |
1539 return _stack_size_at_create; | |
1540 } | |
1541 static inline void set_stack_size_at_create(size_t value) { | |
1542 _stack_size_at_create = value; | |
1543 } | |
1544 | |
342 | 1545 #ifndef SERIALGC |
1546 // SATB marking queue support | |
1547 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
1548 static SATBMarkQueueSet& satb_mark_queue_set() { | |
1549 return _satb_mark_queue_set; | |
1550 } | |
1551 | |
1552 // Dirty card queue support | |
1553 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
1554 static DirtyCardQueueSet& dirty_card_queue_set() { | |
1555 return _dirty_card_queue_set; | |
1556 } | |
1557 #endif // !SERIALGC | |
1558 | |
1842
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1559 // This method initializes the SATB and dirty card queues before a |
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1560 // JavaThread is added to the Java thread list. Right now, we don't |
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1561 // have to do anything to the dirty card queue (it should have been |
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1562 // activated when the thread was created), but we have to activate |
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1563 // the SATB queue if the thread is created while a marking cycle is |
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1564 // in progress. The activation / de-activation of the SATB queues at |
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1565 // the beginning / end of a marking cycle is done during safepoints |
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1566 // so we have to make sure this method is called outside one to be |
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1567 // able to safely read the active field of the SATB queue set. Right |
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1568 // now, it is called just before the thread is added to the Java |
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1569 // thread list in the Threads::add() method. That method is holding |
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1570 // the Threads_lock which ensures we are outside a safepoint. We |
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1571 // cannot do the obvious and set the active field of the SATB queue |
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1572 // when the thread is created given that, in some cases, safepoints |
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1573 // might happen between the JavaThread constructor being called and the |
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1574 // thread being added to the Java thread list (an example of this is |
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1575 // when the structure for the DestroyJavaVM thread is created). |
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1576 #ifndef SERIALGC |
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1577 void initialize_queues(); |
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1578 #else // !SERIALGC |
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1579 void initialize_queues() { } |
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1580 #endif // !SERIALGC |
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1581 |
0 | 1582 // Machine dependent stuff |
1972 | 1583 #ifdef TARGET_OS_ARCH_linux_x86 |
1584 # include "thread_linux_x86.hpp" | |
1585 #endif | |
1586 #ifdef TARGET_OS_ARCH_linux_sparc | |
1587 # include "thread_linux_sparc.hpp" | |
1588 #endif | |
1589 #ifdef TARGET_OS_ARCH_linux_zero | |
1590 # include "thread_linux_zero.hpp" | |
1591 #endif | |
1592 #ifdef TARGET_OS_ARCH_solaris_x86 | |
1593 # include "thread_solaris_x86.hpp" | |
1594 #endif | |
1595 #ifdef TARGET_OS_ARCH_solaris_sparc | |
1596 # include "thread_solaris_sparc.hpp" | |
1597 #endif | |
1598 #ifdef TARGET_OS_ARCH_windows_x86 | |
1599 # include "thread_windows_x86.hpp" | |
1600 #endif | |
1601 | |
0 | 1602 |
1603 public: | |
1604 void set_blocked_on_compilation(bool value) { | |
1605 _blocked_on_compilation = value; | |
1606 } | |
1607 | |
1608 bool blocked_on_compilation() { | |
1609 return _blocked_on_compilation; | |
1610 } | |
1611 protected: | |
1612 bool _blocked_on_compilation; | |
1613 | |
1614 | |
1615 // JSR166 per-thread parker | |
1616 private: | |
1617 Parker* _parker; | |
1618 public: | |
1619 Parker* parker() { return _parker; } | |
1620 | |
1621 // Biased locking support | |
1622 private: | |
1623 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
1624 public: | |
1625 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
1626 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
1627 | |
1628 // clearing/querying jni attach status | |
1629 bool is_attaching() const { return _is_attaching; } | |
1630 void set_attached() { _is_attaching = false; OrderAccess::fence(); } | |
342 | 1631 private: |
1632 // This field is used to determine if a thread has claimed | |
1633 // a par_id: it is -1 if the thread has not claimed a par_id; | |
1634 // otherwise its value is the par_id that has been claimed. | |
1635 int _claimed_par_id; | |
1636 public: | |
1637 int get_claimed_par_id() { return _claimed_par_id; } | |
1638 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
0 | 1639 }; |
1640 | |
1641 // Inline implementation of JavaThread::current | |
1642 inline JavaThread* JavaThread::current() { | |
1643 Thread* thread = ThreadLocalStorage::thread(); | |
1644 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
1645 return (JavaThread*)thread; | |
1646 } | |
1647 | |
1648 inline CompilerThread* JavaThread::as_CompilerThread() { | |
1649 assert(is_Compiler_thread(), "just checking"); | |
1650 return (CompilerThread*)this; | |
1651 } | |
1652 | |
1653 inline bool JavaThread::stack_yellow_zone_disabled() { | |
1654 return _stack_guard_state == stack_guard_yellow_disabled; | |
1655 } | |
1656 | |
1657 inline bool JavaThread::stack_yellow_zone_enabled() { | |
1658 #ifdef ASSERT | |
1659 if (os::uses_stack_guard_pages()) { | |
1660 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
1661 } | |
1662 #endif | |
1663 return _stack_guard_state == stack_guard_enabled; | |
1664 } | |
1665 | |
1666 inline size_t JavaThread::stack_available(address cur_sp) { | |
1667 // This code assumes java stacks grow down | |
1668 address low_addr; // Limit on the address for deepest stack depth | |
1669 if ( _stack_guard_state == stack_guard_unused) { | |
1670 low_addr = stack_base() - stack_size(); | |
1671 } else { | |
1672 low_addr = stack_yellow_zone_base(); | |
1673 } | |
1674 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
1675 } | |
1676 | |
1677 // A JavaThread for low memory detection support | |
1678 class LowMemoryDetectorThread : public JavaThread { | |
1679 friend class VMStructs; | |
1680 public: | |
1681 LowMemoryDetectorThread(ThreadFunction entry_point) : JavaThread(entry_point) {}; | |
1682 | |
1683 // Hide this thread from external view. | |
1684 bool is_hidden_from_external_view() const { return true; } | |
1685 }; | |
1686 | |
1687 // A thread used for Compilation. | |
1688 class CompilerThread : public JavaThread { | |
1689 friend class VMStructs; | |
1690 private: | |
1691 CompilerCounters* _counters; | |
1692 | |
1693 ciEnv* _env; | |
1694 CompileLog* _log; | |
1695 CompileTask* _task; | |
1696 CompileQueue* _queue; | |
1584 | 1697 BufferBlob* _buffer_blob; |
0 | 1698 |
1699 public: | |
1700 | |
1701 static CompilerThread* current(); | |
1702 | |
1703 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
1704 | |
1705 bool is_Compiler_thread() const { return true; } | |
1706 // Hide this compiler thread from external view. | |
1707 bool is_hidden_from_external_view() const { return true; } | |
1708 | |
1709 CompileQueue* queue() { return _queue; } | |
1710 CompilerCounters* counters() { return _counters; } | |
1711 | |
1712 // Get/set the thread's compilation environment. | |
1713 ciEnv* env() { return _env; } | |
1714 void set_env(ciEnv* env) { _env = env; } | |
1715 | |
1584 | 1716 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
1717 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; | |
1718 | |
0 | 1719 // Get/set the thread's logging information |
1720 CompileLog* log() { return _log; } | |
1721 void init_log(CompileLog* log) { | |
1722 // Set once, for good. | |
1723 assert(_log == NULL, "set only once"); | |
1724 _log = log; | |
1725 } | |
1726 | |
1727 #ifndef PRODUCT | |
1728 private: | |
1729 IdealGraphPrinter *_ideal_graph_printer; | |
1730 public: | |
1731 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
1732 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
1733 #endif | |
1734 | |
1735 // Get/set the thread's current task | |
1736 CompileTask* task() { return _task; } | |
1737 void set_task(CompileTask* task) { _task = task; } | |
1738 }; | |
1739 | |
1740 inline CompilerThread* CompilerThread::current() { | |
1741 return JavaThread::current()->as_CompilerThread(); | |
1742 } | |
1743 | |
1744 | |
1745 // The active thread queue. It also keeps track of the current used | |
1746 // thread priorities. | |
1747 class Threads: AllStatic { | |
1748 friend class VMStructs; | |
1749 private: | |
1750 static JavaThread* _thread_list; | |
1751 static int _number_of_threads; | |
1752 static int _number_of_non_daemon_threads; | |
1753 static int _return_code; | |
1754 | |
1755 public: | |
1756 // Thread management | |
1757 // force_daemon is a concession to JNI, where we may need to add a | |
1758 // thread to the thread list before allocating its thread object | |
1759 static void add(JavaThread* p, bool force_daemon = false); | |
1760 static void remove(JavaThread* p); | |
1761 static bool includes(JavaThread* p); | |
1762 static JavaThread* first() { return _thread_list; } | |
1763 static void threads_do(ThreadClosure* tc); | |
1764 | |
1765 // Initializes the vm and creates the vm thread | |
1766 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
1767 static void convert_vm_init_libraries_to_agents(); | |
1768 static void create_vm_init_libraries(); | |
1769 static void create_vm_init_agents(); | |
1770 static void shutdown_vm_agents(); | |
1771 static bool destroy_vm(); | |
1772 // Supported VM versions via JNI | |
1773 // Includes JNI_VERSION_1_1 | |
1774 static jboolean is_supported_jni_version_including_1_1(jint version); | |
1775 // Does not include JNI_VERSION_1_1 | |
1776 static jboolean is_supported_jni_version(jint version); | |
1777 | |
1778 // Garbage collection | |
1779 static void follow_other_roots(void f(oop*)); | |
1780 | |
1781 // Apply "f->do_oop" to all root oops in all threads. | |
1782 // This version may only be called by sequential code. | |
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1783 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1784 // This version may be called by sequential or parallel code. |
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1785 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1786 // This creates a list of GCTasks, one per thread. |
1787 static void create_thread_roots_tasks(GCTaskQueue* q); | |
1788 // This creates a list of GCTasks, one per thread, for marking objects. | |
1789 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
1790 | |
1791 // Apply "f->do_oop" to roots in all threads that | |
1792 // are part of compiled frames | |
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1793 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1794 |
1795 static void convert_hcode_pointers(); | |
1796 static void restore_hcode_pointers(); | |
1797 | |
1798 // Sweeper | |
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1799 static void nmethods_do(CodeBlobClosure* cf); |
0 | 1800 |
1801 static void gc_epilogue(); | |
1802 static void gc_prologue(); | |
1803 | |
1804 // Verification | |
1805 static void verify(); | |
1806 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
1807 static void print(bool print_stacks, bool internal_format) { | |
1808 // this function is only used by debug.cpp | |
1809 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
1810 } | |
1811 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
1812 | |
1813 // Get Java threads that are waiting to enter a monitor. If doLock | |
1814 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1815 // VM needs to be at a safepoint. | |
1816 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
1817 address monitor, bool doLock); | |
1818 | |
1819 // Get owning Java thread from the monitor's owner field. If doLock | |
1820 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1821 // VM needs to be at a safepoint. | |
1822 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
1823 bool doLock); | |
1824 | |
1825 // Number of threads on the active threads list | |
1826 static int number_of_threads() { return _number_of_threads; } | |
1827 // Number of non-daemon threads on the active threads list | |
1828 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
1829 | |
1830 // Deoptimizes all frames tied to marked nmethods | |
1831 static void deoptimized_wrt_marked_nmethods(); | |
1832 | |
1833 }; | |
1834 | |
1835 | |
1836 // Thread iterator | |
1837 class ThreadClosure: public StackObj { | |
1838 public: | |
1839 virtual void do_thread(Thread* thread) = 0; | |
1840 }; | |
1841 | |
1842 class SignalHandlerMark: public StackObj { | |
1843 private: | |
1844 Thread* _thread; | |
1845 public: | |
1846 SignalHandlerMark(Thread* t) { | |
1847 _thread = t; | |
1848 if (_thread) _thread->enter_signal_handler(); | |
1849 } | |
1850 ~SignalHandlerMark() { | |
1851 if (_thread) _thread->leave_signal_handler(); | |
1852 _thread = NULL; | |
1853 } | |
1854 }; | |
1855 | |
1972 | 1856 |
1857 #endif // SHARE_VM_RUNTIME_THREAD_HPP |