Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/thread.hpp @ 20619:b12a2a9b05ca
8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart
author | stefank |
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date | Thu, 02 Oct 2014 10:55:36 +0200 |
parents | 966601b12d4f |
children | d3f3f7677537 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2014, 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" | |
20393 | 43 #include "runtime/thread_ext.hpp" |
1972 | 44 #include "runtime/unhandledOops.hpp" |
10405 | 45 #include "trace/traceBackend.hpp" |
46 #include "trace/traceMacros.hpp" | |
1972 | 47 #include "utilities/exceptions.hpp" |
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48 #include "utilities/macros.hpp" |
1972 | 49 #include "utilities/top.hpp" |
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50 #if INCLUDE_ALL_GCS |
1972 | 51 #include "gc_implementation/g1/dirtyCardQueue.hpp" |
52 #include "gc_implementation/g1/satbQueue.hpp" | |
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53 #endif // INCLUDE_ALL_GCS |
1972 | 54 #ifdef ZERO |
55 #ifdef TARGET_ARCH_zero | |
56 # include "stack_zero.hpp" | |
57 #endif | |
58 #endif | |
59 | |
0 | 60 class ThreadSafepointState; |
61 class ThreadProfiler; | |
62 | |
63 class JvmtiThreadState; | |
64 class JvmtiGetLoadedClassesClosure; | |
65 class ThreadStatistics; | |
66 class ConcurrentLocksDump; | |
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67 class ParkEvent; |
1878 | 68 class Parker; |
0 | 69 |
70 class ciEnv; | |
71 class CompileThread; | |
72 class CompileLog; | |
73 class CompileTask; | |
74 class CompileQueue; | |
75 class CompilerCounters; | |
76 class vframeArray; | |
77 | |
78 class DeoptResourceMark; | |
79 class jvmtiDeferredLocalVariableSet; | |
80 | |
81 class GCTaskQueue; | |
82 class ThreadClosure; | |
83 class IdealGraphPrinter; | |
84 | |
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85 class Metadata; |
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86 template <class T, MEMFLAGS F> class ChunkedList; |
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87 typedef ChunkedList<Metadata*, mtInternal> MetadataOnStackBuffer; |
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88 |
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89 DEBUG_ONLY(class ResourceMark;) |
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90 |
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91 class WorkerThread; |
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92 |
0 | 93 // Class hierarchy |
94 // - Thread | |
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95 // - NamedThread |
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96 // - VMThread |
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97 // - ConcurrentGCThread |
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98 // - WorkerThread |
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99 // - GangWorker |
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100 // - GCTaskThread |
0 | 101 // - JavaThread |
102 // - WatcherThread | |
103 | |
104 class Thread: public ThreadShadow { | |
105 friend class VMStructs; | |
106 private: | |
107 // Exception handling | |
108 // (Note: _pending_exception and friends are in ThreadShadow) | |
109 //oop _pending_exception; // pending exception for current thread | |
110 // const char* _exception_file; // file information for exception (debugging only) | |
111 // int _exception_line; // line information for exception (debugging only) | |
6197 | 112 protected: |
0 | 113 // Support for forcing alignment of thread objects for biased locking |
114 void* _real_malloc_address; | |
115 public: | |
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116 void* operator new(size_t size) throw() { return allocate(size, true); } |
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117 void* operator new(size_t size, const std::nothrow_t& nothrow_constant) throw() { |
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118 return allocate(size, false); } |
0 | 119 void operator delete(void* p); |
6197 | 120 |
121 protected: | |
122 static void* allocate(size_t size, bool throw_excpt, MEMFLAGS flags = mtThread); | |
0 | 123 private: |
124 | |
125 // *************************************************************** | |
126 // Suspend and resume support | |
127 // *************************************************************** | |
128 // | |
129 // VM suspend/resume no longer exists - it was once used for various | |
130 // things including safepoints but was deprecated and finally removed | |
131 // in Java 7. Because VM suspension was considered "internal" Java-level | |
132 // suspension was considered "external", and this legacy naming scheme | |
133 // remains. | |
134 // | |
135 // External suspend/resume requests come from JVM_SuspendThread, | |
136 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
137 // ResumeThread. External | |
138 // suspend requests cause _external_suspend to be set and external | |
139 // resume requests cause _external_suspend to be cleared. | |
140 // External suspend requests do not nest on top of other external | |
141 // suspend requests. The higher level APIs reject suspend requests | |
142 // for already suspended threads. | |
143 // | |
144 // The external_suspend | |
145 // flag is checked by has_special_runtime_exit_condition() and java thread | |
146 // will self-suspend when handle_special_runtime_exit_condition() is | |
147 // called. Most uses of the _thread_blocked state in JavaThreads are | |
148 // considered the same as being externally suspended; if the blocking | |
149 // condition lifts, the JavaThread will self-suspend. Other places | |
150 // where VM checks for external_suspend include: | |
151 // + mutex granting (do not enter monitors when thread is suspended) | |
152 // + state transitions from _thread_in_native | |
153 // | |
154 // In general, java_suspend() does not wait for an external suspend | |
155 // request to complete. When it returns, the only guarantee is that | |
156 // the _external_suspend field is true. | |
157 // | |
158 // wait_for_ext_suspend_completion() is used to wait for an external | |
159 // suspend request to complete. External suspend requests are usually | |
160 // followed by some other interface call that requires the thread to | |
161 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
162 // the interface that requires quiescence, we give the JavaThread a | |
163 // chance to self-suspend before we need it to be quiescent. This | |
164 // improves overall suspend/query performance. | |
165 // | |
166 // _suspend_flags controls the behavior of java_ suspend/resume. | |
167 // It must be set under the protection of SR_lock. Read from the flag is | |
168 // OK without SR_lock as long as the value is only used as a hint. | |
169 // (e.g., check _external_suspend first without lock and then recheck | |
170 // inside SR_lock and finish the suspension) | |
171 // | |
172 // _suspend_flags is also overloaded for other "special conditions" so | |
173 // that a single check indicates whether any special action is needed | |
174 // eg. for async exceptions. | |
175 // ------------------------------------------------------------------- | |
176 // Notes: | |
177 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
178 // but we still update its value to keep other part of the system (mainly | |
179 // JVMTI) happy. ThreadState is legacy code (see notes in | |
180 // osThread.hpp). | |
181 // | |
182 // 2. It would be more natural if set_external_suspend() is private and | |
183 // part of java_suspend(), but that probably would affect the suspend/query | |
184 // performance. Need more investigation on this. | |
185 // | |
186 | |
187 // suspend/resume lock: used for self-suspend | |
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188 Monitor* _SR_lock; |
0 | 189 |
190 protected: | |
191 enum SuspendFlags { | |
192 // NOTE: avoid using the sign-bit as cc generates different test code | |
193 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
194 | |
195 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
196 _ext_suspended = 0x40000000U, // thread has self-suspended | |
197 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
198 | |
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199 _has_async_exception = 0x00000001U, // there is a pending async exception |
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200 _critical_native_unlock = 0x00000002U // Must call back to unlock JNI critical lock |
0 | 201 }; |
202 | |
203 // various suspension related flags - atomically updated | |
204 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
205 volatile uint32_t _suspend_flags; | |
206 | |
207 private: | |
208 int _num_nested_signal; | |
209 | |
210 public: | |
211 void enter_signal_handler() { _num_nested_signal++; } | |
212 void leave_signal_handler() { _num_nested_signal--; } | |
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213 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
0 | 214 |
215 private: | |
216 // Debug tracing | |
217 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
218 | |
219 // Active_handles points to a block of handles | |
220 JNIHandleBlock* _active_handles; | |
221 | |
222 // One-element thread local free list | |
223 JNIHandleBlock* _free_handle_block; | |
224 | |
225 // Point to the last handle mark | |
226 HandleMark* _last_handle_mark; | |
227 | |
228 // The parity of the last strong_roots iteration in which this thread was | |
229 // claimed as a task. | |
230 jint _oops_do_parity; | |
231 | |
232 public: | |
233 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
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234 HandleMark* last_handle_mark() const { return _last_handle_mark; } |
0 | 235 private: |
236 | |
237 // debug support for checking if code does allow safepoints or not | |
238 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
239 // mutex, or blocking on an object synchronizer (Java locking). | |
240 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
241 // If !allow_allocation(), then an assertion failure will happen during allocation | |
242 // (Hence, !allow_safepoint() => !allow_allocation()). | |
243 // | |
244 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
245 // | |
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246 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
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247 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
0 | 248 |
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249 // Used by SkipGCALot class. |
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250 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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251 |
0 | 252 friend class No_Alloc_Verifier; |
253 friend class No_Safepoint_Verifier; | |
254 friend class Pause_No_Safepoint_Verifier; | |
255 friend class ThreadLocalStorage; | |
256 friend class GC_locker; | |
257 | |
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258 ThreadLocalAllocBuffer _tlab; // Thread-local eden |
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259 jlong _allocated_bytes; // Cumulative number of bytes allocated on |
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260 // the Java heap |
0 | 261 |
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262 // Thread-local buffer used by MetadataOnStackMark. |
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263 MetadataOnStackBuffer* _metadata_on_stack_buffer; |
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264 |
10405 | 265 TRACE_DATA _trace_data; // Thread-local data for tracing |
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266 |
20393 | 267 ThreadExt _ext; |
268 | |
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269 int _vm_operation_started_count; // VM_Operation support |
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270 int _vm_operation_completed_count; // VM_Operation support |
0 | 271 |
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272 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
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273 // is waiting to lock |
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274 bool _current_pending_monitor_is_from_java; // locking is from Java code |
0 | 275 |
276 // ObjectMonitor on which this thread called Object.wait() | |
277 ObjectMonitor* _current_waiting_monitor; | |
278 | |
279 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
280 public: | |
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281 ObjectMonitor* omFreeList; |
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282 int omFreeCount; // length of omFreeList |
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283 int omFreeProvision; // reload chunk size |
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284 ObjectMonitor* omInUseList; // SLL to track monitors in circulation |
1587 | 285 int omInUseCount; // length of omInUseList |
0 | 286 |
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287 #ifdef ASSERT |
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288 private: |
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289 bool _visited_for_critical_count; |
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290 |
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291 public: |
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292 void set_visited_for_critical_count(bool z) { _visited_for_critical_count = z; } |
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293 bool was_visited_for_critical_count() const { return _visited_for_critical_count; } |
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294 #endif |
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295 |
0 | 296 public: |
297 enum { | |
298 is_definitely_current_thread = true | |
299 }; | |
300 | |
301 // Constructor | |
302 Thread(); | |
303 virtual ~Thread(); | |
304 | |
305 // initializtion | |
306 void initialize_thread_local_storage(); | |
307 | |
308 // thread entry point | |
309 virtual void run(); | |
310 | |
311 // Testers | |
312 virtual bool is_VM_thread() const { return false; } | |
313 virtual bool is_Java_thread() const { return false; } | |
314 virtual bool is_Compiler_thread() const { return false; } | |
315 virtual bool is_hidden_from_external_view() const { return false; } | |
316 virtual bool is_jvmti_agent_thread() const { return false; } | |
317 // True iff the thread can perform GC operations at a safepoint. | |
318 // Generally will be true only of VM thread and parallel GC WorkGang | |
319 // threads. | |
320 virtual bool is_GC_task_thread() const { return false; } | |
321 virtual bool is_Watcher_thread() const { return false; } | |
322 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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323 virtual bool is_Named_thread() const { return false; } |
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324 virtual bool is_Worker_thread() const { return false; } |
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325 |
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326 // Casts |
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327 virtual WorkerThread* as_Worker_thread() const { return NULL; } |
0 | 328 |
329 virtual char* name() const { return (char*)"Unknown thread"; } | |
330 | |
331 // Returns the current thread | |
332 static inline Thread* current(); | |
333 | |
334 // Common thread operations | |
335 static void set_priority(Thread* thread, ThreadPriority priority); | |
336 static ThreadPriority get_priority(const Thread* const thread); | |
337 static void start(Thread* thread); | |
338 static void interrupt(Thread* thr); | |
339 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
340 | |
4006 | 341 void set_native_thread_name(const char *name) { |
342 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); | |
343 os::set_native_thread_name(name); | |
344 } | |
345 | |
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346 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
0 | 347 Monitor* SR_lock() const { return _SR_lock; } |
348 | |
349 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
350 | |
351 void set_suspend_flag(SuspendFlags f) { | |
352 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
353 uint32_t flags; | |
354 do { | |
355 flags = _suspend_flags; | |
356 } | |
357 while (Atomic::cmpxchg((jint)(flags | f), | |
358 (volatile jint*)&_suspend_flags, | |
359 (jint)flags) != (jint)flags); | |
360 } | |
361 void clear_suspend_flag(SuspendFlags f) { | |
362 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
363 uint32_t flags; | |
364 do { | |
365 flags = _suspend_flags; | |
366 } | |
367 while (Atomic::cmpxchg((jint)(flags & ~f), | |
368 (volatile jint*)&_suspend_flags, | |
369 (jint)flags) != (jint)flags); | |
370 } | |
371 | |
372 void set_has_async_exception() { | |
373 set_suspend_flag(_has_async_exception); | |
374 } | |
375 void clear_has_async_exception() { | |
376 clear_suspend_flag(_has_async_exception); | |
377 } | |
378 | |
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379 bool do_critical_native_unlock() const { return (_suspend_flags & _critical_native_unlock) != 0; } |
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380 |
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381 void set_critical_native_unlock() { |
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382 set_suspend_flag(_critical_native_unlock); |
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383 } |
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384 void clear_critical_native_unlock() { |
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385 clear_suspend_flag(_critical_native_unlock); |
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386 } |
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387 |
0 | 388 // Support for Unhandled Oop detection |
389 #ifdef CHECK_UNHANDLED_OOPS | |
390 private: | |
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391 UnhandledOops* _unhandled_oops; |
0 | 392 public: |
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393 UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
0 | 394 // Mark oop safe for gc. It may be stack allocated but won't move. |
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395 void allow_unhandled_oop(oop *op) { |
0 | 396 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
397 } | |
398 // Clear oops at safepoint so crashes point to unhandled oop violator | |
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399 void clear_unhandled_oops() { |
0 | 400 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
401 } | |
402 #endif // CHECK_UNHANDLED_OOPS | |
403 | |
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404 #ifndef PRODUCT |
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405 bool skip_gcalot() { return _skip_gcalot; } |
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406 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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407 #endif |
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408 |
0 | 409 public: |
410 // Installs a pending exception to be inserted later | |
411 static void send_async_exception(oop thread_oop, oop java_throwable); | |
412 | |
413 // Resource area | |
414 ResourceArea* resource_area() const { return _resource_area; } | |
415 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
416 | |
417 OSThread* osthread() const { return _osthread; } | |
418 void set_osthread(OSThread* thread) { _osthread = thread; } | |
419 | |
420 // JNI handle support | |
421 JNIHandleBlock* active_handles() const { return _active_handles; } | |
422 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
423 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
424 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
425 | |
426 // Internal handle support | |
427 HandleArea* handle_area() const { return _handle_area; } | |
428 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
429 | |
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430 GrowableArray<Metadata*>* metadata_handles() const { return _metadata_handles; } |
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431 void set_metadata_handles(GrowableArray<Metadata*>* handles){ _metadata_handles = handles; } |
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432 |
0 | 433 // Thread-Local Allocation Buffer (TLAB) support |
434 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
435 void initialize_tlab() { | |
436 if (UseTLAB) { | |
437 tlab().initialize(); | |
438 } | |
439 } | |
440 | |
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441 jlong allocated_bytes() { return _allocated_bytes; } |
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442 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } |
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443 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } |
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444 inline jlong cooked_allocated_bytes(); |
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445 |
10405 | 446 TRACE_DATA* trace_data() { return &_trace_data; } |
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447 |
20393 | 448 const ThreadExt& ext() const { return _ext; } |
449 ThreadExt& ext() { return _ext; } | |
450 | |
0 | 451 // VM operation support |
452 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
453 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
454 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
455 | |
456 // For tracking the heavyweight monitor the thread is pending on. | |
457 ObjectMonitor* current_pending_monitor() { | |
458 return _current_pending_monitor; | |
459 } | |
460 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
461 _current_pending_monitor = monitor; | |
462 } | |
463 void set_current_pending_monitor_is_from_java(bool from_java) { | |
464 _current_pending_monitor_is_from_java = from_java; | |
465 } | |
466 bool current_pending_monitor_is_from_java() { | |
467 return _current_pending_monitor_is_from_java; | |
468 } | |
469 | |
470 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
471 ObjectMonitor* current_waiting_monitor() { | |
472 return _current_waiting_monitor; | |
473 } | |
474 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
475 _current_waiting_monitor = monitor; | |
476 } | |
477 | |
478 // GC support | |
479 // Apply "f->do_oop" to all root oops in "this". | |
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480 // Apply "cld_f->do_cld" to CLDs that are otherwise not kept alive. |
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481 // Used by JavaThread::oops_do. |
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482 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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483 virtual void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); |
0 | 484 |
485 // Handles the parallel case for the method below. | |
486 private: | |
487 bool claim_oops_do_par_case(int collection_parity); | |
488 public: | |
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489 // Requires that "collection_parity" is that of the current roots |
0 | 490 // iteration. If "is_par" is false, sets the parity of "this" to |
491 // "collection_parity", and returns "true". If "is_par" is true, | |
492 // uses an atomic instruction to set the current threads parity to | |
493 // "collection_parity", if it is not already. Returns "true" iff the | |
494 // calling thread does the update, this indicates that the calling thread | |
495 // has claimed the thread's stack as a root groop in the current | |
496 // collection. | |
497 bool claim_oops_do(bool is_par, int collection_parity) { | |
498 if (!is_par) { | |
499 _oops_do_parity = collection_parity; | |
500 return true; | |
501 } else { | |
502 return claim_oops_do_par_case(collection_parity); | |
503 } | |
504 } | |
505 | |
506 // Sweeper support | |
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507 void nmethods_do(CodeBlobClosure* cf); |
0 | 508 |
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509 // jvmtiRedefineClasses support |
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510 void metadata_do(void f(Metadata*)); |
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511 |
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512 // Used by fast lock support |
0 | 513 virtual bool is_lock_owned(address adr) const; |
514 | |
515 // Check if address is in the stack of the thread (not just for locks). | |
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516 // Warning: the method can only be used on the running thread |
0 | 517 bool is_in_stack(address adr) const; |
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518 // Check if address is in the usable part of the stack (excludes protected |
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519 // guard pages) |
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520 bool is_in_usable_stack(address adr) const; |
0 | 521 |
522 // Sets this thread as starting thread. Returns failure if thread | |
523 // creation fails due to lack of memory, too many threads etc. | |
524 bool set_as_starting_thread(); | |
525 | |
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526 void set_metadata_on_stack_buffer(MetadataOnStackBuffer* buffer) { _metadata_on_stack_buffer = buffer; } |
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527 MetadataOnStackBuffer* metadata_on_stack_buffer() const { return _metadata_on_stack_buffer; } |
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528 |
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529 protected: |
0 | 530 // OS data associated with the thread |
531 OSThread* _osthread; // Platform-specific thread information | |
532 | |
533 // Thread local resource area for temporary allocation within the VM | |
534 ResourceArea* _resource_area; | |
535 | |
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536 DEBUG_ONLY(ResourceMark* _current_resource_mark;) |
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537 |
0 | 538 // Thread local handle area for allocation of handles within the VM |
539 HandleArea* _handle_area; | |
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540 GrowableArray<Metadata*>* _metadata_handles; |
0 | 541 |
542 // Support for stack overflow handling, get_thread, etc. | |
543 address _stack_base; | |
544 size_t _stack_size; | |
545 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
546 int _lgrp_id; | |
547 | |
548 public: | |
549 // Stack overflow support | |
550 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
551 | |
552 void set_stack_base(address base) { _stack_base = base; } | |
553 size_t stack_size() const { return _stack_size; } | |
554 void set_stack_size(size_t size) { _stack_size = size; } | |
555 void record_stack_base_and_size(); | |
556 | |
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557 bool on_local_stack(address adr) const { |
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558 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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559 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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560 } |
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561 |
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562 uintptr_t self_raw_id() { return _self_raw_id; } |
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563 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } |
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564 |
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565 int lgrp_id() const { return _lgrp_id; } |
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566 void set_lgrp_id(int value) { _lgrp_id = value; } |
0 | 567 |
568 // Printing | |
569 void print_on(outputStream* st) const; | |
570 void print() const { print_on(tty); } | |
571 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
572 | |
573 // Debug-only code | |
574 #ifdef ASSERT | |
575 private: | |
576 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
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577 Monitor* _owned_locks; |
0 | 578 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
579 // thus the friendship | |
580 friend class Mutex; | |
581 friend class Monitor; | |
582 | |
583 public: | |
584 void print_owned_locks_on(outputStream* st) const; | |
585 void print_owned_locks() const { print_owned_locks_on(tty); } | |
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586 Monitor* owned_locks() const { return _owned_locks; } |
0 | 587 bool owns_locks() const { return owned_locks() != NULL; } |
588 bool owns_locks_but_compiled_lock() const; | |
589 | |
590 // Deadlock detection | |
591 bool allow_allocation() { return _allow_allocation_count == 0; } | |
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592 ResourceMark* current_resource_mark() { return _current_resource_mark; } |
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593 void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; } |
0 | 594 #endif |
595 | |
596 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
597 | |
598 private: | |
599 volatile int _jvmti_env_iteration_count; | |
600 | |
601 public: | |
602 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
603 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
604 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
605 | |
606 // Code generation | |
607 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
608 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
609 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
610 | |
611 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
612 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
613 | |
614 #define TLAB_FIELD_OFFSET(name) \ | |
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615 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
0 | 616 |
617 TLAB_FIELD_OFFSET(start) | |
618 TLAB_FIELD_OFFSET(end) | |
619 TLAB_FIELD_OFFSET(top) | |
620 TLAB_FIELD_OFFSET(pf_top) | |
621 TLAB_FIELD_OFFSET(size) // desired_size | |
622 TLAB_FIELD_OFFSET(refill_waste_limit) | |
623 TLAB_FIELD_OFFSET(number_of_refills) | |
624 TLAB_FIELD_OFFSET(fast_refill_waste) | |
625 TLAB_FIELD_OFFSET(slow_allocations) | |
626 | |
627 #undef TLAB_FIELD_OFFSET | |
628 | |
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629 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } |
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630 |
0 | 631 public: |
632 volatile intptr_t _Stalled ; | |
633 volatile int _TypeTag ; | |
634 ParkEvent * _ParkEvent ; // for synchronized() | |
635 ParkEvent * _SleepEvent ; // for Thread.sleep | |
636 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
637 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
638 int NativeSyncRecursion ; // diagnostic | |
639 | |
640 volatile int _OnTrap ; // Resume-at IP delta | |
641 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
642 jint _hashStateX ; // thread-specific hashCode generator state | |
643 jint _hashStateY ; | |
644 jint _hashStateZ ; | |
645 void * _schedctl ; | |
646 | |
647 | |
648 volatile jint rng [4] ; // RNG for spin loop | |
649 | |
650 // Low-level leaf-lock primitives used to implement synchronization | |
651 // and native monitor-mutex infrastructure. | |
652 // Not for general synchronization use. | |
653 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
654 static void SpinRelease (volatile int * Lock) ; | |
655 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
656 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
657 static void muxRelease (volatile intptr_t * Lock) ; | |
658 }; | |
659 | |
660 // Inline implementation of Thread::current() | |
661 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
662 // startup. | |
663 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
664 // period. This is inlined in thread_<os_family>.inline.hpp. | |
665 | |
666 inline Thread* Thread::current() { | |
667 #ifdef ASSERT | |
668 // This function is very high traffic. Define PARANOID to enable expensive | |
669 // asserts. | |
670 #ifdef PARANOID | |
671 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
672 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
673 assert(t != NULL && !t->is_inside_signal_handler(), | |
674 "Don't use Thread::current() inside signal handler"); | |
675 #endif | |
676 #endif | |
677 Thread* thread = ThreadLocalStorage::thread(); | |
678 assert(thread != NULL, "just checking"); | |
679 return thread; | |
680 } | |
681 | |
682 // Name support for threads. non-JavaThread subclasses with multiple | |
683 // uniquely named instances should derive from this. | |
684 class NamedThread: public Thread { | |
685 friend class VMStructs; | |
686 enum { | |
687 max_name_len = 64 | |
688 }; | |
689 private: | |
690 char* _name; | |
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691 // log JavaThread being processed by oops_do |
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692 JavaThread* _processed_thread; |
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693 |
0 | 694 public: |
695 NamedThread(); | |
696 ~NamedThread(); | |
697 // May only be called once per thread. | |
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698 void set_name(const char* format, ...) ATTRIBUTE_PRINTF(2, 3); |
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699 virtual bool is_Named_thread() const { return true; } |
0 | 700 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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701 JavaThread *processed_thread() { return _processed_thread; } |
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702 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
0 | 703 }; |
704 | |
705 // Worker threads are named and have an id of an assigned work. | |
706 class WorkerThread: public NamedThread { | |
707 private: | |
708 uint _id; | |
709 public: | |
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710 WorkerThread() : _id(0) { } |
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711 virtual bool is_Worker_thread() const { return true; } |
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712 |
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713 virtual WorkerThread* as_Worker_thread() const { |
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714 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); |
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715 return (WorkerThread*) this; |
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716 } |
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717 |
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718 void set_id(uint work_id) { _id = work_id; } |
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719 uint id() const { return _id; } |
0 | 720 }; |
721 | |
722 // A single WatcherThread is used for simulating timer interrupts. | |
723 class WatcherThread: public Thread { | |
724 friend class VMStructs; | |
725 public: | |
726 virtual void run(); | |
727 | |
728 private: | |
729 static WatcherThread* _watcher_thread; | |
730 | |
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731 static bool _startable; |
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732 volatile static bool _should_terminate; // updated without holding lock |
11151 | 733 |
734 os::WatcherThreadCrashProtection* _crash_protection; | |
0 | 735 public: |
736 enum SomeConstants { | |
737 delay_interval = 10 // interrupt delay in milliseconds | |
738 }; | |
739 | |
740 // Constructor | |
741 WatcherThread(); | |
742 | |
743 // Tester | |
744 bool is_Watcher_thread() const { return true; } | |
745 | |
746 // Printing | |
747 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
748 void print_on(outputStream* st) const; | |
749 void print() const { print_on(tty); } | |
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750 void unpark(); |
0 | 751 |
752 // Returns the single instance of WatcherThread | |
753 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
754 | |
755 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
756 static void start(); | |
757 static void stop(); | |
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758 // Only allow start once the VM is sufficiently initialized |
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759 // Otherwise the first task to enroll will trigger the start |
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760 static void make_startable(); |
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761 |
11151 | 762 void set_crash_protection(os::WatcherThreadCrashProtection* crash_protection) { |
763 assert(Thread::current()->is_Watcher_thread(), "Can only be set by WatcherThread"); | |
764 _crash_protection = crash_protection; | |
765 } | |
766 | |
767 bool has_crash_protection() const { return _crash_protection != NULL; } | |
768 os::WatcherThreadCrashProtection* crash_protection() const { return _crash_protection; } | |
769 | |
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770 private: |
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771 int sleep() const; |
0 | 772 }; |
773 | |
774 | |
775 class CompilerThread; | |
776 | |
777 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
778 | |
779 class JavaThread: public Thread { | |
780 friend class VMStructs; | |
781 private: | |
782 JavaThread* _next; // The next thread in the Threads list | |
783 oop _threadObj; // The Java level thread object | |
784 | |
785 #ifdef ASSERT | |
786 private: | |
787 int _java_call_counter; | |
788 | |
789 public: | |
790 int java_call_counter() { return _java_call_counter; } | |
791 void inc_java_call_counter() { _java_call_counter++; } | |
792 void dec_java_call_counter() { | |
793 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
794 _java_call_counter--; | |
795 } | |
796 private: // restore original namespace restriction | |
797 #endif // ifdef ASSERT | |
798 | |
799 #ifndef PRODUCT | |
800 public: | |
801 enum { | |
802 jump_ring_buffer_size = 16 | |
803 }; | |
804 private: // restore original namespace restriction | |
805 #endif | |
806 | |
807 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
808 | |
809 ThreadFunction _entry_point; | |
810 | |
811 JNIEnv _jni_environment; | |
812 | |
813 // Deopt support | |
814 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
815 | |
816 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
817 // transition out of native | |
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818 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized |
0 | 819 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
820 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
821 // Because deoptimization is lazy we must save jvmti requests to set locals | |
822 // in compiled frames until we deoptimize and we have an interpreter frame. | |
823 // This holds the pointer to array (yeah like there might be more than one) of | |
824 // description of compiled vframes that have locals that need to be updated. | |
825 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
826 | |
827 // Handshake value for fixing 6243940. We need a place for the i2c | |
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828 // adapter to store the callee Method*. This value is NEVER live |
0 | 829 // across a gc point so it does NOT have to be gc'd |
830 // The handshake is open ended since we can't be certain that it will | |
831 // be NULLed. This is because we rarely ever see the race and end up | |
832 // in handle_wrong_method which is the backend of the handshake. See | |
833 // code in i2c adapters and handle_wrong_method. | |
834 | |
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835 Method* _callee_target; |
0 | 836 |
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837 // Used to pass back results to the interpreter or generated code running Java code. |
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838 oop _vm_result; // oop result is GC-preserved |
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839 Metadata* _vm_result_2; // non-oop result |
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840 |
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841 // See ReduceInitialCardMarks: this holds the precise space interval of |
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842 // the most recent slow path allocation for which compiled code has |
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843 // elided card-marks for performance along the fast-path. |
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844 MemRegion _deferred_card_mark; |
0 | 845 |
846 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
847 // allocated during deoptimization | |
848 // and by JNI_MonitorEnter/Exit | |
849 | |
850 // Async. requests support | |
851 enum AsyncRequests { | |
852 _no_async_condition = 0, | |
853 _async_exception, | |
854 _async_unsafe_access_error | |
855 }; | |
856 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
857 oop _pending_async_exception; | |
858 | |
859 // Safepoint support | |
860 public: // Expose _thread_state for SafeFetchInt() | |
861 volatile JavaThreadState _thread_state; | |
862 private: | |
863 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
864 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
865 | |
866 // JavaThread termination support | |
867 enum TerminatedTypes { | |
868 _not_terminated = 0xDEAD - 2, | |
869 _thread_exiting, // JavaThread::exit() has been called for this thread | |
870 _thread_terminated, // JavaThread is removed from thread list | |
871 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
872 // only VM_Exit can set _vm_exited | |
873 }; | |
874 | |
875 // In general a JavaThread's _terminated field transitions as follows: | |
876 // | |
877 // _not_terminated => _thread_exiting => _thread_terminated | |
878 // | |
879 // _vm_exited is a special value to cover the case of a JavaThread | |
880 // executing native code after the VM itself is terminated. | |
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881 volatile TerminatedTypes _terminated; |
0 | 882 // suspend/resume support |
883 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
884 jint _in_deopt_handler; // count of deoptimization | |
885 // handlers thread is in | |
886 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
887 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
888 // never locked) when throwing an exception. Used by interpreter only. | |
889 | |
4006 | 890 // JNI attach states: |
891 enum JNIAttachStates { | |
892 _not_attaching_via_jni = 1, // thread is not attaching via JNI | |
893 _attaching_via_jni, // thread is attaching via JNI | |
894 _attached_via_jni // thread has attached via JNI | |
895 }; | |
896 | |
897 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. | |
898 // A native thread that is attaching via JNI starts with a value | |
899 // of _attaching_via_jni and transitions to _attached_via_jni. | |
900 volatile JNIAttachStates _jni_attach_state; | |
0 | 901 |
902 public: | |
903 // State of the stack guard pages for this thread. | |
904 enum StackGuardState { | |
905 stack_guard_unused, // not needed | |
906 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
907 stack_guard_enabled // enabled | |
908 }; | |
909 | |
910 private: | |
911 | |
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912 StackGuardState _stack_guard_state; |
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913 |
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914 // Precompute the limit of the stack as used in stack overflow checks. |
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915 // We load it from here to simplify the stack overflow check in assembly. |
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916 address _stack_overflow_limit; |
0 | 917 |
918 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
919 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
920 // code) | |
921 volatile oop _exception_oop; // Exception thrown in compiled code | |
922 volatile address _exception_pc; // PC where exception happened | |
923 volatile address _exception_handler_pc; // PC for handler of exception | |
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924 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
0 | 925 |
926 // support for JNI critical regions | |
927 jint _jni_active_critical; // count of entries into JNI critical region | |
928 | |
929 // For deadlock detection. | |
930 int _depth_first_number; | |
931 | |
932 // JVMTI PopFrame support | |
933 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
934 int _popframe_condition; | |
935 | |
936 #ifndef PRODUCT | |
937 int _jmp_ring_index; | |
938 struct { | |
939 // We use intptr_t instead of address so debugger doesn't try and display strings | |
940 intptr_t _target; | |
941 intptr_t _instruction; | |
942 const char* _file; | |
943 int _line; | |
944 } _jmp_ring[ jump_ring_buffer_size ]; | |
945 #endif /* PRODUCT */ | |
946 | |
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947 #if INCLUDE_ALL_GCS |
342 | 948 // Support for G1 barriers |
949 | |
950 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
951 // Set of all such queues. | |
952 static SATBMarkQueueSet _satb_mark_queue_set; | |
953 | |
954 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
955 // Set of all such queues. | |
956 static DirtyCardQueueSet _dirty_card_queue_set; | |
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957 |
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958 void flush_barrier_queues(); |
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959 #endif // INCLUDE_ALL_GCS |
342 | 960 |
0 | 961 friend class VMThread; |
962 friend class ThreadWaitTransition; | |
963 friend class VM_Exit; | |
964 | |
965 void initialize(); // Initialized the instance variables | |
966 | |
967 public: | |
968 // Constructor | |
4006 | 969 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads |
0 | 970 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); |
971 ~JavaThread(); | |
972 | |
973 #ifdef ASSERT | |
974 // verify this JavaThread hasn't be published in the Threads::list yet | |
975 void verify_not_published(); | |
976 #endif | |
977 | |
978 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
979 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
980 _jni_environment.functions = functionTable; | |
981 } | |
982 struct JNINativeInterface_* get_jni_functions() { | |
983 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
984 } | |
985 | |
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986 // This function is called at thread creation to allow |
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987 // platform specific thread variables to be initialized. |
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988 void cache_global_variables(); |
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989 |
0 | 990 // Executes Shutdown.shutdown() |
991 void invoke_shutdown_hooks(); | |
992 | |
993 // Cleanup on thread exit | |
994 enum ExitType { | |
995 normal_exit, | |
996 jni_detach | |
997 }; | |
998 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
999 | |
1000 void cleanup_failed_attach_current_thread(); | |
1001 | |
1002 // Testers | |
1003 virtual bool is_Java_thread() const { return true; } | |
1004 | |
1005 // Thread chain operations | |
1006 JavaThread* next() const { return _next; } | |
1007 void set_next(JavaThread* p) { _next = p; } | |
1008 | |
1009 // Thread oop. threadObj() can be NULL for initial JavaThread | |
1010 // (or for threads attached via JNI) | |
1011 oop threadObj() const { return _threadObj; } | |
1012 void set_threadObj(oop p) { _threadObj = p; } | |
1013 | |
1014 ThreadPriority java_priority() const; // Read from threadObj() | |
1015 | |
1016 // Prepare thread and add to priority queue. If a priority is | |
1017 // not specified, use the priority of the thread object. Threads_lock | |
1018 // must be held while this function is called. | |
1019 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
20393 | 1020 void prepare_ext(); |
0 | 1021 |
1022 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
1023 address saved_exception_pc() { return _saved_exception_pc; } | |
1024 | |
1025 | |
1026 ThreadFunction entry_point() const { return _entry_point; } | |
1027 | |
1028 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
1029 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
1030 | |
1031 // Last frame anchor routines | |
1032 | |
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1033 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } |
0 | 1034 |
1035 // last_Java_sp | |
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1036 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } |
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1037 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } |
0 | 1038 |
1039 // last_Java_pc | |
1040 | |
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1041 address last_Java_pc(void) { return _anchor.last_Java_pc(); } |
0 | 1042 |
1043 // Safepoint support | |
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1044 #ifndef PPC64 |
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1045 JavaThreadState thread_state() const { return _thread_state; } |
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1046 void set_thread_state(JavaThreadState s) { _thread_state = s; } |
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1047 #else |
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1048 // Use membars when accessing volatile _thread_state. See |
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1049 // Threads::create_vm() for size checks. |
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1050 inline JavaThreadState thread_state() const; |
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1051 inline void set_thread_state(JavaThreadState s); |
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1052 #endif |
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1053 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } |
0 | 1054 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } |
1055 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
1056 | |
1057 // thread has called JavaThread::exit() or is terminated | |
1058 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
1059 // thread is terminated (no longer on the threads list); we compare | |
1060 // against the two non-terminated values so that a freed JavaThread | |
1061 // will also be considered terminated. | |
1062 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
1063 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
1064 // special for Threads::remove() which is static: | |
1065 void set_terminated_value() { _terminated = _thread_terminated; } | |
1066 void block_if_vm_exited(); | |
1067 | |
1068 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
1069 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
1070 | |
1071 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
1072 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
1073 | |
1074 // Suspend/resume support for JavaThread | |
1075 private: | |
1076 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
1077 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
1078 | |
1079 public: | |
1080 void java_suspend(); | |
1081 void java_resume(); | |
1082 int java_suspend_self(); | |
1083 | |
1084 void check_and_wait_while_suspended() { | |
1085 assert(JavaThread::current() == this, "sanity check"); | |
1086 | |
1087 bool do_self_suspend; | |
1088 do { | |
1089 // were we externally suspended while we were waiting? | |
1090 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
1091 if (do_self_suspend) { | |
1092 // don't surprise the thread that suspended us by returning | |
1093 java_suspend_self(); | |
1094 set_suspend_equivalent(); | |
1095 } | |
1096 } while (do_self_suspend); | |
1097 } | |
1098 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
1099 // Check for async exception in addition to safepoint and suspend request. | |
1100 static void check_special_condition_for_native_trans(JavaThread *thread); | |
1101 | |
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1102 // Same as check_special_condition_for_native_trans but finishes the |
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1103 // transition into thread_in_Java mode so that it can potentially |
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1104 // block. |
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1105 static void check_special_condition_for_native_trans_and_transition(JavaThread *thread); |
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1106 |
0 | 1107 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); |
1108 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
1109 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1110 // Warning: is_ext_suspend_completed() may temporarily drop the | |
1111 // SR_lock to allow the thread to reach a stable thread state if | |
1112 // it is currently in a transient thread state. | |
1113 return is_ext_suspend_completed(false /*!called_by_wait */, | |
1114 SuspendRetryDelay, bits); | |
1115 } | |
1116 | |
1117 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
1118 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
1119 // passed as the count and delay parameters. Experiments with specific | |
1120 // calls to wait_for_ext_suspend_completion() can be done by passing | |
1121 // other values in the code. Experiments with all calls can be done | |
1122 // via the appropriate -XX options. | |
1123 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
1124 | |
1125 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
1126 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
1127 | |
1128 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
1129 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
1130 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
1131 | |
1132 bool is_external_suspend() const { | |
1133 return (_suspend_flags & _external_suspend) != 0; | |
1134 } | |
1135 // Whenever a thread transitions from native to vm/java it must suspend | |
1136 // if external|deopt suspend is present. | |
1137 bool is_suspend_after_native() const { | |
1138 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
1139 } | |
1140 | |
1141 // external suspend request is completed | |
1142 bool is_ext_suspended() const { | |
1143 return (_suspend_flags & _ext_suspended) != 0; | |
1144 } | |
1145 | |
1146 bool is_external_suspend_with_lock() const { | |
1147 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1148 return is_external_suspend(); | |
1149 } | |
1150 | |
1151 // Special method to handle a pending external suspend request | |
1152 // when a suspend equivalent condition lifts. | |
1153 bool handle_special_suspend_equivalent_condition() { | |
1154 assert(is_suspend_equivalent(), | |
1155 "should only be called in a suspend equivalence condition"); | |
1156 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1157 bool ret = is_external_suspend(); | |
1158 if (!ret) { | |
1159 // not about to self-suspend so clear suspend equivalence | |
1160 clear_suspend_equivalent(); | |
1161 } | |
1162 // implied else: | |
1163 // We have a pending external suspend request so we leave the | |
1164 // suspend_equivalent flag set until java_suspend_self() sets | |
1165 // the ext_suspended flag and clears the suspend_equivalent | |
1166 // flag. This insures that wait_for_ext_suspend_completion() | |
1167 // will return consistent values. | |
1168 return ret; | |
1169 } | |
1170 | |
1171 // utility methods to see if we are doing some kind of suspension | |
1172 bool is_being_ext_suspended() const { | |
1173 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1174 return is_ext_suspended() || is_external_suspend(); | |
1175 } | |
1176 | |
1177 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
1178 | |
1179 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
1180 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
1181 | |
1182 // Thread.stop support | |
1183 void send_thread_stop(oop throwable); | |
1184 AsyncRequests clear_special_runtime_exit_condition() { | |
1185 AsyncRequests x = _special_runtime_exit_condition; | |
1186 _special_runtime_exit_condition = _no_async_condition; | |
1187 return x; | |
1188 } | |
1189 | |
1190 // Are any async conditions present? | |
1191 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
1192 | |
1193 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
1194 | |
1195 // these next two are also used for self-suspension and async exception support | |
1196 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
1197 | |
1198 // Return true if JavaThread has an asynchronous condition or | |
1199 // if external suspension is requested. | |
1200 bool has_special_runtime_exit_condition() { | |
1201 // We call is_external_suspend() last since external suspend should | |
1202 // be less common. Because we don't use is_external_suspend_with_lock | |
1203 // it is possible that we won't see an asynchronous external suspend | |
1204 // request that has just gotten started, i.e., SR_lock grabbed but | |
1205 // _external_suspend field change either not made yet or not visible | |
1206 // yet. However, this is okay because the request is asynchronous and | |
1207 // we will see the new flag value the next time through. It's also | |
1208 // possible that the external suspend request is dropped after | |
1209 // we have checked is_external_suspend(), we will recheck its value | |
1210 // under SR_lock in java_suspend_self(). | |
1211 return (_special_runtime_exit_condition != _no_async_condition) || | |
1212 is_external_suspend() || is_deopt_suspend(); | |
1213 } | |
1214 | |
1215 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
1216 | |
1217 void set_pending_async_exception(oop e) { | |
1218 _pending_async_exception = e; | |
1219 _special_runtime_exit_condition = _async_exception; | |
1220 set_has_async_exception(); | |
1221 } | |
1222 | |
1223 // Fast-locking support | |
1224 bool is_lock_owned(address adr) const; | |
1225 | |
1226 // Accessors for vframe array top | |
1227 // The linked list of vframe arrays are sorted on sp. This means when we | |
1228 // unpack the head must contain the vframe array to unpack. | |
1229 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
1230 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
1231 | |
1232 // Side structure for defering update of java frame locals until deopt occurs | |
1233 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
1234 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
1235 | |
1236 // These only really exist to make debugging deopt problems simpler | |
1237 | |
1238 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
1239 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
1240 | |
1241 // The special resourceMark used during deoptimization | |
1242 | |
1243 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
1244 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
1245 | |
1246 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
1247 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
1248 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
1249 | |
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1250 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1251 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1252 |
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1253 Method* callee_target() const { return _callee_target; } |
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1254 void set_callee_target (Method* x) { _callee_target = x; } |
0 | 1255 |
1256 // Oop results of vm runtime calls | |
1257 oop vm_result() const { return _vm_result; } | |
1258 void set_vm_result (oop x) { _vm_result = x; } | |
1259 | |
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1260 Metadata* vm_result_2() const { return _vm_result_2; } |
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1261 void set_vm_result_2 (Metadata* x) { _vm_result_2 = x; } |
0 | 1262 |
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1263 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1264 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1265 |
0 | 1266 // Exception handling for compiled methods |
1267 oop exception_oop() const { return _exception_oop; } | |
1268 address exception_pc() const { return _exception_pc; } | |
1269 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1270 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
0 | 1271 |
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1272 void set_exception_oop(oop o) { (void)const_cast<oop&>(_exception_oop = o); } |
0 | 1273 void set_exception_pc(address a) { _exception_pc = a; } |
1274 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
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1275 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
0 | 1276 |
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1277 void clear_exception_oop_and_pc() { |
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1278 set_exception_oop(NULL); |
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1279 set_exception_pc(NULL); |
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1280 } |
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1281 |
0 | 1282 // Stack overflow support |
1283 inline size_t stack_available(address cur_sp); | |
1284 address stack_yellow_zone_base() | |
1285 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
1286 size_t stack_yellow_zone_size() | |
1287 { return StackYellowPages * os::vm_page_size(); } | |
1288 address stack_red_zone_base() | |
1289 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
1290 size_t stack_red_zone_size() | |
1291 { return StackRedPages * os::vm_page_size(); } | |
1292 bool in_stack_yellow_zone(address a) | |
1293 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
1294 bool in_stack_red_zone(address a) | |
1295 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
1296 | |
1297 void create_stack_guard_pages(); | |
1298 void remove_stack_guard_pages(); | |
1299 | |
1300 void enable_stack_yellow_zone(); | |
1301 void disable_stack_yellow_zone(); | |
1302 void enable_stack_red_zone(); | |
1303 void disable_stack_red_zone(); | |
1304 | |
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1305 inline bool stack_guard_zone_unused(); |
0 | 1306 inline bool stack_yellow_zone_disabled(); |
1307 inline bool stack_yellow_zone_enabled(); | |
1308 | |
1309 // Attempt to reguard the stack after a stack overflow may have occurred. | |
1310 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
1311 // pages are already guarded, or (c) the pages were successfully reguarded. | |
1312 // Returns false if there is not enough stack space to reguard the pages, in | |
1313 // which case the caller should unwind a frame and try again. The argument | |
1314 // should be the caller's (approximate) sp. | |
1315 bool reguard_stack(address cur_sp); | |
1316 // Similar to above but see if current stackpoint is out of the guard area | |
1317 // and reguard if possible. | |
1318 bool reguard_stack(void); | |
1319 | |
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1320 address stack_overflow_limit() { return _stack_overflow_limit; } |
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1321 void set_stack_overflow_limit() { |
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1322 _stack_overflow_limit = _stack_base - _stack_size + |
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1323 ((StackShadowPages + |
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1324 StackYellowPages + |
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1325 StackRedPages) * os::vm_page_size()); |
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1326 } |
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1327 |
0 | 1328 // Misc. accessors/mutators |
1329 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
1330 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
1331 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
1332 | |
1333 #ifndef PRODUCT | |
1334 void record_jump(address target, address instr, const char* file, int line); | |
1335 #endif /* PRODUCT */ | |
1336 | |
1337 // For assembly stub generation | |
1338 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
1339 #ifndef PRODUCT | |
1340 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
1341 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
1342 #endif /* PRODUCT */ | |
1343 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
1344 static ByteSize last_Java_sp_offset() { | |
1345 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
1346 } | |
1347 static ByteSize last_Java_pc_offset() { | |
1348 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
1349 } | |
1350 static ByteSize frame_anchor_offset() { | |
1351 return byte_offset_of(JavaThread, _anchor); | |
1352 } | |
1353 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
1354 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
1355 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
1356 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
1357 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
1358 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
1359 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
1360 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
1361 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
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1362 static ByteSize stack_overflow_limit_offset() { return byte_offset_of(JavaThread, _stack_overflow_limit); } |
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1363 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
0 | 1364 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
1365 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
1366 | |
1367 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1368 static ByteSize should_post_on_exceptions_flag_offset() { |
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1369 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1370 } |
0 | 1371 |
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1372 #if INCLUDE_ALL_GCS |
342 | 1373 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } |
1374 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
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1375 #endif // INCLUDE_ALL_GCS |
342 | 1376 |
0 | 1377 // Returns the jni environment for this thread |
1378 JNIEnv* jni_environment() { return &_jni_environment; } | |
1379 | |
1380 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
1381 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
1382 // Only return NULL if thread is off the thread list; starting to | |
1383 // exit should not return NULL. | |
1384 if (thread_from_jni_env->is_terminated()) { | |
1385 thread_from_jni_env->block_if_vm_exited(); | |
1386 return NULL; | |
1387 } else { | |
1388 return thread_from_jni_env; | |
1389 } | |
1390 } | |
1391 | |
1392 // JNI critical regions. These can nest. | |
1393 bool in_critical() { return _jni_active_critical > 0; } | |
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1394 bool in_last_critical() { return _jni_active_critical == 1; } |
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1395 void enter_critical() { assert(Thread::current() == this || |
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1396 Thread::current()->is_VM_thread() && SafepointSynchronize::is_synchronizing(), |
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1397 "this must be current thread or synchronizing"); |
0 | 1398 _jni_active_critical++; } |
1399 void exit_critical() { assert(Thread::current() == this, | |
1400 "this must be current thread"); | |
1401 _jni_active_critical--; | |
1402 assert(_jni_active_critical >= 0, | |
1403 "JNI critical nesting problem?"); } | |
1404 | |
1405 // For deadlock detection | |
1406 int depth_first_number() { return _depth_first_number; } | |
1407 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
1408 | |
1409 private: | |
1410 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
1411 | |
1412 public: | |
1413 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
1414 void add_monitor_chunk(MonitorChunk* chunk); | |
1415 void remove_monitor_chunk(MonitorChunk* chunk); | |
1416 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
1417 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
1418 void dec_in_deopt_handler() { | |
1419 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
1420 if (_in_deopt_handler > 0) { // robustness | |
1421 _in_deopt_handler--; | |
1422 } | |
1423 } | |
1424 | |
1425 private: | |
1426 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
1427 | |
1428 public: | |
1429 | |
1430 // Frame iteration; calls the function f for all frames on the stack | |
1431 void frames_do(void f(frame*, const RegisterMap*)); | |
1432 | |
1433 // Memory operations | |
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1434 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); |
0 | 1435 |
1436 // Sweeper operations | |
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1437 void nmethods_do(CodeBlobClosure* cf); |
0 | 1438 |
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1439 // RedefineClasses Support |
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1440 void metadata_do(void f(Metadata*)); |
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1441 |
0 | 1442 // Memory management operations |
1443 void gc_epilogue(); | |
1444 void gc_prologue(); | |
1445 | |
1446 // Misc. operations | |
1447 char* name() const { return (char*)get_thread_name(); } | |
1448 void print_on(outputStream* st) const; | |
1449 void print() const { print_on(tty); } | |
1450 void print_value(); | |
1451 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
1452 void print_thread_state() const PRODUCT_RETURN; | |
1453 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
1454 void verify(); | |
1455 const char* get_thread_name() const; | |
1456 private: | |
1457 // factor out low-level mechanics for use in both normal and error cases | |
1458 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
1459 public: | |
1460 const char* get_threadgroup_name() const; | |
1461 const char* get_parent_name() const; | |
1462 | |
1463 // Accessing frames | |
1464 frame last_frame() { | |
1465 _anchor.make_walkable(this); | |
1466 return pd_last_frame(); | |
1467 } | |
1468 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
1469 | |
1470 // Returns method at 'depth' java or native frames down the stack | |
1471 // Used for security checks | |
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1472 Klass* security_get_caller_class(int depth); |
0 | 1473 |
1474 // Print stack trace in external format | |
1475 void print_stack_on(outputStream* st); | |
1476 void print_stack() { print_stack_on(tty); } | |
1477 | |
1478 // Print stack traces in various internal formats | |
1479 void trace_stack() PRODUCT_RETURN; | |
1480 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
1481 void trace_frames() PRODUCT_RETURN; | |
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1482 void trace_oops() PRODUCT_RETURN; |
0 | 1483 |
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1484 // Print an annotated view of the stack frames |
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1485 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; |
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1486 void validate_frame_layout() { |
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1487 print_frame_layout(0, true); |
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1488 } |
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1489 |
0 | 1490 // Returns the number of stack frames on the stack |
1491 int depth() const; | |
1492 | |
1493 // Function for testing deoptimization | |
1494 void deoptimize(); | |
1495 void make_zombies(); | |
1496 | |
1497 void deoptimized_wrt_marked_nmethods(); | |
1498 | |
1499 // Profiling operation (see fprofile.cpp) | |
1500 public: | |
1501 bool profile_last_Java_frame(frame* fr); | |
1502 | |
1503 private: | |
1504 ThreadProfiler* _thread_profiler; | |
1505 private: | |
1506 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
1507 friend class FlatProfilerTask; // uses get_thread_profiler. | |
1508 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
1509 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
1510 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
1511 ThreadProfiler* result = _thread_profiler; | |
1512 _thread_profiler = tp; | |
1513 return result; | |
1514 } | |
1515 | |
1516 public: | |
1517 // Returns the running thread as a JavaThread | |
1518 static inline JavaThread* current(); | |
1519 | |
1520 // Returns the active Java thread. Do not use this if you know you are calling | |
1521 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
1522 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
1523 // operation. You may not want that either. | |
1524 static JavaThread* active(); | |
1525 | |
1526 inline CompilerThread* as_CompilerThread(); | |
1527 | |
1528 public: | |
1529 virtual void run(); | |
1530 void thread_main_inner(); | |
1531 | |
1532 private: | |
1533 // PRIVILEGED STACK | |
1534 PrivilegedElement* _privileged_stack_top; | |
1535 GrowableArray<oop>* _array_for_gc; | |
1536 public: | |
1537 | |
1538 // Returns the privileged_stack information. | |
1539 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
1540 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
1541 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
1542 | |
1543 public: | |
1544 // Thread local information maintained by JVMTI. | |
1545 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
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1546 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1547 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1548 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1549 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1550 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1551 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1552 // the specified JavaThread is exiting. |
0 | 1553 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
1554 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
1555 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
1556 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
1557 | |
1558 // JVMTI PopFrame support | |
1559 // Setting and clearing popframe_condition | |
1560 // All of these enumerated values are bits. popframe_pending | |
1561 // indicates that a PopFrame() has been requested and not yet been | |
1562 // completed. popframe_processing indicates that that PopFrame() is in | |
1563 // the process of being completed. popframe_force_deopt_reexecution_bit | |
1564 // indicates that special handling is required when returning to a | |
1565 // deoptimized caller. | |
1566 enum PopCondition { | |
1567 popframe_inactive = 0x00, | |
1568 popframe_pending_bit = 0x01, | |
1569 popframe_processing_bit = 0x02, | |
1570 popframe_force_deopt_reexecution_bit = 0x04 | |
1571 }; | |
1572 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
1573 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
1574 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
1575 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
1576 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
1577 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
1578 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
1579 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
1580 #ifdef CC_INTERP | |
1581 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
1582 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
1583 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
1584 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
1585 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
1586 #endif | |
1587 | |
1588 private: | |
1589 // Saved incoming arguments to popped frame. | |
1590 // Used only when popped interpreted frame returns to deoptimized frame. | |
1591 void* _popframe_preserved_args; | |
1592 int _popframe_preserved_args_size; | |
1593 | |
1594 public: | |
1595 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
1596 void* popframe_preserved_args(); | |
1597 ByteSize popframe_preserved_args_size(); | |
1598 WordSize popframe_preserved_args_size_in_words(); | |
1599 void popframe_free_preserved_args(); | |
1600 | |
1601 | |
1602 private: | |
1603 JvmtiThreadState *_jvmti_thread_state; | |
1604 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
1605 | |
1606 // Used by the interpreter in fullspeed mode for frame pop, method | |
1607 // entry, method exit and single stepping support. This field is | |
1608 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
1609 // It can be set to zero asynchronously (i.e., without a VM operation | |
1610 // or a lock) so we have to be very careful. | |
1611 int _interp_only_mode; | |
1612 | |
1613 public: | |
1614 // used by the interpreter for fullspeed debugging support (see above) | |
1615 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
1616 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
1617 int get_interp_only_mode() { return _interp_only_mode; } | |
1618 void increment_interp_only_mode() { ++_interp_only_mode; } | |
1619 void decrement_interp_only_mode() { --_interp_only_mode; } | |
1620 | |
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1621 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1622 // if this is false, we can avoid deoptimizing when events are thrown |
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1623 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1624 private: |
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1625 int _should_post_on_exceptions_flag; |
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1626 |
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1627 public: |
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1628 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1629 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1630 |
0 | 1631 private: |
1632 ThreadStatistics *_thread_stat; | |
1633 | |
1634 public: | |
1635 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
1636 | |
1637 // Return a blocker object for which this thread is blocked parking. | |
1638 oop current_park_blocker(); | |
1639 | |
1640 private: | |
1641 static size_t _stack_size_at_create; | |
1642 | |
1643 public: | |
1644 static inline size_t stack_size_at_create(void) { | |
1645 return _stack_size_at_create; | |
1646 } | |
1647 static inline void set_stack_size_at_create(size_t value) { | |
1648 _stack_size_at_create = value; | |
1649 } | |
1650 | |
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|
1651 #if INCLUDE_ALL_GCS |
342 | 1652 // SATB marking queue support |
1653 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
1654 static SATBMarkQueueSet& satb_mark_queue_set() { | |
1655 return _satb_mark_queue_set; | |
1656 } | |
1657 | |
1658 // Dirty card queue support | |
1659 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
1660 static DirtyCardQueueSet& dirty_card_queue_set() { | |
1661 return _dirty_card_queue_set; | |
1662 } | |
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1663 #endif // INCLUDE_ALL_GCS |
342 | 1664 |
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1665 // This method initializes the SATB and dirty card queues before a |
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1666 // JavaThread is added to the Java thread list. Right now, we don't |
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1667 // have to do anything to the dirty card queue (it should have been |
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1668 // activated when the thread was created), but we have to activate |
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1669 // the SATB queue if the thread is created while a marking cycle is |
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1670 // in progress. The activation / de-activation of the SATB queues at |
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1671 // the beginning / end of a marking cycle is done during safepoints |
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1672 // so we have to make sure this method is called outside one to be |
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1673 // able to safely read the active field of the SATB queue set. Right |
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1674 // now, it is called just before the thread is added to the Java |
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1675 // thread list in the Threads::add() method. That method is holding |
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1676 // the Threads_lock which ensures we are outside a safepoint. We |
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1677 // cannot do the obvious and set the active field of the SATB queue |
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1678 // when the thread is created given that, in some cases, safepoints |
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1679 // might happen between the JavaThread constructor being called and the |
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1680 // thread being added to the Java thread list (an example of this is |
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1681 // when the structure for the DestroyJavaVM thread is created). |
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1682 #if INCLUDE_ALL_GCS |
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1683 void initialize_queues(); |
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1684 #else // INCLUDE_ALL_GCS |
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1685 void initialize_queues() { } |
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1686 #endif // INCLUDE_ALL_GCS |
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1687 |
0 | 1688 // Machine dependent stuff |
1972 | 1689 #ifdef TARGET_OS_ARCH_linux_x86 |
1690 # include "thread_linux_x86.hpp" | |
1691 #endif | |
1692 #ifdef TARGET_OS_ARCH_linux_sparc | |
1693 # include "thread_linux_sparc.hpp" | |
1694 #endif | |
1695 #ifdef TARGET_OS_ARCH_linux_zero | |
1696 # include "thread_linux_zero.hpp" | |
1697 #endif | |
1698 #ifdef TARGET_OS_ARCH_solaris_x86 | |
1699 # include "thread_solaris_x86.hpp" | |
1700 #endif | |
1701 #ifdef TARGET_OS_ARCH_solaris_sparc | |
1702 # include "thread_solaris_sparc.hpp" | |
1703 #endif | |
1704 #ifdef TARGET_OS_ARCH_windows_x86 | |
1705 # include "thread_windows_x86.hpp" | |
1706 #endif | |
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1707 #ifdef TARGET_OS_ARCH_linux_arm |
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1708 # include "thread_linux_arm.hpp" |
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1709 #endif |
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1710 #ifdef TARGET_OS_ARCH_linux_ppc |
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1711 # include "thread_linux_ppc.hpp" |
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1712 #endif |
14411 | 1713 #ifdef TARGET_OS_ARCH_aix_ppc |
1714 # include "thread_aix_ppc.hpp" | |
1715 #endif | |
3960 | 1716 #ifdef TARGET_OS_ARCH_bsd_x86 |
1717 # include "thread_bsd_x86.hpp" | |
1718 #endif | |
1719 #ifdef TARGET_OS_ARCH_bsd_zero | |
1720 # include "thread_bsd_zero.hpp" | |
1721 #endif | |
1972 | 1722 |
0 | 1723 |
1724 public: | |
1725 void set_blocked_on_compilation(bool value) { | |
1726 _blocked_on_compilation = value; | |
1727 } | |
1728 | |
1729 bool blocked_on_compilation() { | |
1730 return _blocked_on_compilation; | |
1731 } | |
1732 protected: | |
1733 bool _blocked_on_compilation; | |
1734 | |
1735 | |
1736 // JSR166 per-thread parker | |
1737 private: | |
1738 Parker* _parker; | |
1739 public: | |
1740 Parker* parker() { return _parker; } | |
1741 | |
1742 // Biased locking support | |
1743 private: | |
1744 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
1745 public: | |
1746 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
1747 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
1748 | |
1749 // clearing/querying jni attach status | |
4006 | 1750 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } |
1751 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } | |
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1752 inline void set_done_attaching_via_jni(); |
342 | 1753 private: |
1754 // This field is used to determine if a thread has claimed | |
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1755 // a par_id: it is UINT_MAX if the thread has not claimed a par_id; |
342 | 1756 // otherwise its value is the par_id that has been claimed. |
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1757 uint _claimed_par_id; |
342 | 1758 public: |
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1759 uint get_claimed_par_id() { return _claimed_par_id; } |
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1760 void set_claimed_par_id(uint id) { _claimed_par_id = id;} |
0 | 1761 }; |
1762 | |
1763 // Inline implementation of JavaThread::current | |
1764 inline JavaThread* JavaThread::current() { | |
1765 Thread* thread = ThreadLocalStorage::thread(); | |
1766 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
1767 return (JavaThread*)thread; | |
1768 } | |
1769 | |
1770 inline CompilerThread* JavaThread::as_CompilerThread() { | |
1771 assert(is_Compiler_thread(), "just checking"); | |
1772 return (CompilerThread*)this; | |
1773 } | |
1774 | |
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1775 inline bool JavaThread::stack_guard_zone_unused() { |
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1776 return _stack_guard_state == stack_guard_unused; |
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1777 } |
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1778 |
0 | 1779 inline bool JavaThread::stack_yellow_zone_disabled() { |
1780 return _stack_guard_state == stack_guard_yellow_disabled; | |
1781 } | |
1782 | |
1783 inline bool JavaThread::stack_yellow_zone_enabled() { | |
1784 #ifdef ASSERT | |
1785 if (os::uses_stack_guard_pages()) { | |
1786 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
1787 } | |
1788 #endif | |
1789 return _stack_guard_state == stack_guard_enabled; | |
1790 } | |
1791 | |
1792 inline size_t JavaThread::stack_available(address cur_sp) { | |
1793 // This code assumes java stacks grow down | |
1794 address low_addr; // Limit on the address for deepest stack depth | |
1795 if ( _stack_guard_state == stack_guard_unused) { | |
1796 low_addr = stack_base() - stack_size(); | |
1797 } else { | |
1798 low_addr = stack_yellow_zone_base(); | |
1799 } | |
1800 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
1801 } | |
1802 | |
1803 // A thread used for Compilation. | |
1804 class CompilerThread : public JavaThread { | |
1805 friend class VMStructs; | |
1806 private: | |
1807 CompilerCounters* _counters; | |
1808 | |
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1809 ciEnv* _env; |
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1810 CompileLog* _log; |
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1811 CompileTask* _task; |
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1812 CompileQueue* _queue; |
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1813 BufferBlob* _buffer_blob; |
0 | 1814 |
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1815 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper |
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1816 AbstractCompiler* _compiler; |
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1817 |
0 | 1818 public: |
1819 | |
1820 static CompilerThread* current(); | |
1821 | |
1822 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
1823 | |
1824 bool is_Compiler_thread() const { return true; } | |
1825 // Hide this compiler thread from external view. | |
1826 bool is_hidden_from_external_view() const { return true; } | |
1827 | |
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1828 void set_compiler(AbstractCompiler* c) { _compiler = c; } |
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1829 AbstractCompiler* compiler() const { return _compiler; } |
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1830 |
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1831 CompileQueue* queue() const { return _queue; } |
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1832 CompilerCounters* counters() const { return _counters; } |
0 | 1833 |
1834 // Get/set the thread's compilation environment. | |
1835 ciEnv* env() { return _env; } | |
1836 void set_env(ciEnv* env) { _env = env; } | |
1837 | |
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1838 BufferBlob* get_buffer_blob() const { return _buffer_blob; } |
1584 | 1839 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; |
1840 | |
0 | 1841 // Get/set the thread's logging information |
1842 CompileLog* log() { return _log; } | |
1843 void init_log(CompileLog* log) { | |
1844 // Set once, for good. | |
1845 assert(_log == NULL, "set only once"); | |
1846 _log = log; | |
1847 } | |
1848 | |
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1849 // GC support |
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1850 // Apply "f->do_oop" to all root oops in "this". |
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1851 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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1852 void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); |
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1853 |
0 | 1854 #ifndef PRODUCT |
1855 private: | |
1856 IdealGraphPrinter *_ideal_graph_printer; | |
1857 public: | |
1858 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
1859 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
1860 #endif | |
1861 | |
1862 // Get/set the thread's current task | |
1863 CompileTask* task() { return _task; } | |
1864 void set_task(CompileTask* task) { _task = task; } | |
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1865 |
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1866 // Track the nmethod currently being scanned by the sweeper |
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1867 void set_scanned_nmethod(nmethod* nm) { |
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1868 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); |
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1869 _scanned_nmethod = nm; |
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1870 } |
0 | 1871 }; |
1872 | |
1873 inline CompilerThread* CompilerThread::current() { | |
1874 return JavaThread::current()->as_CompilerThread(); | |
1875 } | |
1876 | |
1877 | |
1878 // The active thread queue. It also keeps track of the current used | |
1879 // thread priorities. | |
1880 class Threads: AllStatic { | |
1881 friend class VMStructs; | |
1882 private: | |
1883 static JavaThread* _thread_list; | |
1884 static int _number_of_threads; | |
1885 static int _number_of_non_daemon_threads; | |
1886 static int _return_code; | |
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1887 #ifdef ASSERT |
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1888 static bool _vm_complete; |
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1889 #endif |
0 | 1890 |
1891 public: | |
1892 // Thread management | |
1893 // force_daemon is a concession to JNI, where we may need to add a | |
1894 // thread to the thread list before allocating its thread object | |
1895 static void add(JavaThread* p, bool force_daemon = false); | |
1896 static void remove(JavaThread* p); | |
1897 static bool includes(JavaThread* p); | |
1898 static JavaThread* first() { return _thread_list; } | |
1899 static void threads_do(ThreadClosure* tc); | |
1900 | |
1901 // Initializes the vm and creates the vm thread | |
1902 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
1903 static void convert_vm_init_libraries_to_agents(); | |
1904 static void create_vm_init_libraries(); | |
1905 static void create_vm_init_agents(); | |
1906 static void shutdown_vm_agents(); | |
1907 static bool destroy_vm(); | |
1908 // Supported VM versions via JNI | |
1909 // Includes JNI_VERSION_1_1 | |
1910 static jboolean is_supported_jni_version_including_1_1(jint version); | |
1911 // Does not include JNI_VERSION_1_1 | |
1912 static jboolean is_supported_jni_version(jint version); | |
1913 | |
1914 // Garbage collection | |
1915 static void follow_other_roots(void f(oop*)); | |
1916 | |
1917 // Apply "f->do_oop" to all root oops in all threads. | |
1918 // This version may only be called by sequential code. | |
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1919 static void oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); |
0 | 1920 // This version may be called by sequential or parallel code. |
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1921 static void possibly_parallel_oops_do(OopClosure* f, CLDClosure* cld_f, CodeBlobClosure* cf); |
0 | 1922 // This creates a list of GCTasks, one per thread. |
1923 static void create_thread_roots_tasks(GCTaskQueue* q); | |
1924 // This creates a list of GCTasks, one per thread, for marking objects. | |
1925 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
1926 | |
1927 // Apply "f->do_oop" to roots in all threads that | |
1928 // are part of compiled frames | |
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1929 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1930 |
1931 static void convert_hcode_pointers(); | |
1932 static void restore_hcode_pointers(); | |
1933 | |
1934 // Sweeper | |
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1935 static void nmethods_do(CodeBlobClosure* cf); |
0 | 1936 |
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1937 // RedefineClasses support |
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1938 static void metadata_do(void f(Metadata*)); |
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1939 |
0 | 1940 static void gc_epilogue(); |
1941 static void gc_prologue(); | |
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1942 #ifdef ASSERT |
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1943 static bool is_vm_complete() { return _vm_complete; } |
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1944 #endif |
0 | 1945 |
1946 // Verification | |
1947 static void verify(); | |
1948 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
1949 static void print(bool print_stacks, bool internal_format) { | |
1950 // this function is only used by debug.cpp | |
1951 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
1952 } | |
1953 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
1954 | |
1955 // Get Java threads that are waiting to enter a monitor. If doLock | |
1956 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1957 // VM needs to be at a safepoint. | |
1958 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
1959 address monitor, bool doLock); | |
1960 | |
1961 // Get owning Java thread from the monitor's owner field. If doLock | |
1962 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1963 // VM needs to be at a safepoint. | |
1964 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
1965 bool doLock); | |
1966 | |
1967 // Number of threads on the active threads list | |
1968 static int number_of_threads() { return _number_of_threads; } | |
1969 // Number of non-daemon threads on the active threads list | |
1970 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
1971 | |
1972 // Deoptimizes all frames tied to marked nmethods | |
1973 static void deoptimized_wrt_marked_nmethods(); | |
1974 | |
20393 | 1975 static JavaThread* find_java_thread_from_java_tid(jlong java_tid); |
1976 | |
0 | 1977 }; |
1978 | |
1979 | |
1980 // Thread iterator | |
1981 class ThreadClosure: public StackObj { | |
1982 public: | |
1983 virtual void do_thread(Thread* thread) = 0; | |
1984 }; | |
1985 | |
1986 class SignalHandlerMark: public StackObj { | |
1987 private: | |
1988 Thread* _thread; | |
1989 public: | |
1990 SignalHandlerMark(Thread* t) { | |
1991 _thread = t; | |
1992 if (_thread) _thread->enter_signal_handler(); | |
1993 } | |
1994 ~SignalHandlerMark() { | |
1995 if (_thread) _thread->leave_signal_handler(); | |
1996 _thread = NULL; | |
1997 } | |
1998 }; | |
1999 | |
1972 | 2000 |
2001 #endif // SHARE_VM_RUNTIME_THREAD_HPP |