Mercurial > hg > truffle
annotate src/share/vm/runtime/thread.hpp @ 4849:520830f632e7
7131346: Parsing of boolean arguments to diagnostic commands is broken
Reviewed-by: dholmes, dcubed
author | fparain |
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date | Wed, 25 Jan 2012 10:32:29 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_THREAD_HPP |
26 #define SHARE_VM_RUNTIME_THREAD_HPP | |
27 | |
28 #include "memory/allocation.hpp" | |
29 #include "memory/threadLocalAllocBuffer.hpp" | |
30 #include "oops/oop.hpp" | |
31 #include "prims/jni.h" | |
32 #include "prims/jvmtiExport.hpp" | |
33 #include "runtime/frame.hpp" | |
34 #include "runtime/javaFrameAnchor.hpp" | |
35 #include "runtime/jniHandles.hpp" | |
36 #include "runtime/mutexLocker.hpp" | |
37 #include "runtime/os.hpp" | |
38 #include "runtime/osThread.hpp" | |
39 #include "runtime/park.hpp" | |
40 #include "runtime/safepoint.hpp" | |
41 #include "runtime/stubRoutines.hpp" | |
42 #include "runtime/threadLocalStorage.hpp" | |
43 #include "runtime/unhandledOops.hpp" | |
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44 #include "trace/tracing.hpp" |
1972 | 45 #include "utilities/exceptions.hpp" |
46 #include "utilities/top.hpp" | |
47 #ifndef SERIALGC | |
48 #include "gc_implementation/g1/dirtyCardQueue.hpp" | |
49 #include "gc_implementation/g1/satbQueue.hpp" | |
50 #endif | |
51 #ifdef ZERO | |
52 #ifdef TARGET_ARCH_zero | |
53 # include "stack_zero.hpp" | |
54 #endif | |
55 #endif | |
56 | |
0 | 57 class ThreadSafepointState; |
58 class ThreadProfiler; | |
59 | |
60 class JvmtiThreadState; | |
61 class JvmtiGetLoadedClassesClosure; | |
62 class ThreadStatistics; | |
63 class ConcurrentLocksDump; | |
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64 class ParkEvent; |
1878 | 65 class Parker; |
0 | 66 |
67 class ciEnv; | |
68 class CompileThread; | |
69 class CompileLog; | |
70 class CompileTask; | |
71 class CompileQueue; | |
72 class CompilerCounters; | |
73 class vframeArray; | |
74 | |
75 class DeoptResourceMark; | |
76 class jvmtiDeferredLocalVariableSet; | |
77 | |
78 class GCTaskQueue; | |
79 class ThreadClosure; | |
80 class IdealGraphPrinter; | |
81 | |
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82 class WorkerThread; |
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83 |
0 | 84 // Class hierarchy |
85 // - Thread | |
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86 // - NamedThread |
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87 // - VMThread |
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88 // - ConcurrentGCThread |
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89 // - WorkerThread |
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90 // - GangWorker |
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91 // - GCTaskThread |
0 | 92 // - JavaThread |
93 // - WatcherThread | |
94 | |
95 class Thread: public ThreadShadow { | |
96 friend class VMStructs; | |
97 private: | |
98 // Exception handling | |
99 // (Note: _pending_exception and friends are in ThreadShadow) | |
100 //oop _pending_exception; // pending exception for current thread | |
101 // const char* _exception_file; // file information for exception (debugging only) | |
102 // int _exception_line; // line information for exception (debugging only) | |
103 | |
104 // Support for forcing alignment of thread objects for biased locking | |
105 void* _real_malloc_address; | |
106 public: | |
107 void* operator new(size_t size); | |
108 void operator delete(void* p); | |
109 private: | |
110 | |
111 // *************************************************************** | |
112 // Suspend and resume support | |
113 // *************************************************************** | |
114 // | |
115 // VM suspend/resume no longer exists - it was once used for various | |
116 // things including safepoints but was deprecated and finally removed | |
117 // in Java 7. Because VM suspension was considered "internal" Java-level | |
118 // suspension was considered "external", and this legacy naming scheme | |
119 // remains. | |
120 // | |
121 // External suspend/resume requests come from JVM_SuspendThread, | |
122 // JVM_ResumeThread, JVMTI SuspendThread, and finally JVMTI | |
123 // ResumeThread. External | |
124 // suspend requests cause _external_suspend to be set and external | |
125 // resume requests cause _external_suspend to be cleared. | |
126 // External suspend requests do not nest on top of other external | |
127 // suspend requests. The higher level APIs reject suspend requests | |
128 // for already suspended threads. | |
129 // | |
130 // The external_suspend | |
131 // flag is checked by has_special_runtime_exit_condition() and java thread | |
132 // will self-suspend when handle_special_runtime_exit_condition() is | |
133 // called. Most uses of the _thread_blocked state in JavaThreads are | |
134 // considered the same as being externally suspended; if the blocking | |
135 // condition lifts, the JavaThread will self-suspend. Other places | |
136 // where VM checks for external_suspend include: | |
137 // + mutex granting (do not enter monitors when thread is suspended) | |
138 // + state transitions from _thread_in_native | |
139 // | |
140 // In general, java_suspend() does not wait for an external suspend | |
141 // request to complete. When it returns, the only guarantee is that | |
142 // the _external_suspend field is true. | |
143 // | |
144 // wait_for_ext_suspend_completion() is used to wait for an external | |
145 // suspend request to complete. External suspend requests are usually | |
146 // followed by some other interface call that requires the thread to | |
147 // be quiescent, e.g., GetCallTrace(). By moving the "wait time" into | |
148 // the interface that requires quiescence, we give the JavaThread a | |
149 // chance to self-suspend before we need it to be quiescent. This | |
150 // improves overall suspend/query performance. | |
151 // | |
152 // _suspend_flags controls the behavior of java_ suspend/resume. | |
153 // It must be set under the protection of SR_lock. Read from the flag is | |
154 // OK without SR_lock as long as the value is only used as a hint. | |
155 // (e.g., check _external_suspend first without lock and then recheck | |
156 // inside SR_lock and finish the suspension) | |
157 // | |
158 // _suspend_flags is also overloaded for other "special conditions" so | |
159 // that a single check indicates whether any special action is needed | |
160 // eg. for async exceptions. | |
161 // ------------------------------------------------------------------- | |
162 // Notes: | |
163 // 1. The suspend/resume logic no longer uses ThreadState in OSThread | |
164 // but we still update its value to keep other part of the system (mainly | |
165 // JVMTI) happy. ThreadState is legacy code (see notes in | |
166 // osThread.hpp). | |
167 // | |
168 // 2. It would be more natural if set_external_suspend() is private and | |
169 // part of java_suspend(), but that probably would affect the suspend/query | |
170 // performance. Need more investigation on this. | |
171 // | |
172 | |
173 // suspend/resume lock: used for self-suspend | |
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174 Monitor* _SR_lock; |
0 | 175 |
176 protected: | |
177 enum SuspendFlags { | |
178 // NOTE: avoid using the sign-bit as cc generates different test code | |
179 // when the sign-bit is used, and sometimes incorrectly - see CR 6398077 | |
180 | |
181 _external_suspend = 0x20000000U, // thread is asked to self suspend | |
182 _ext_suspended = 0x40000000U, // thread has self-suspended | |
183 _deopt_suspend = 0x10000000U, // thread needs to self suspend for deopt | |
184 | |
185 _has_async_exception = 0x00000001U // there is a pending async exception | |
186 }; | |
187 | |
188 // various suspension related flags - atomically updated | |
189 // overloaded for async exception checking in check_special_condition_for_native_trans. | |
190 volatile uint32_t _suspend_flags; | |
191 | |
192 private: | |
193 int _num_nested_signal; | |
194 | |
195 public: | |
196 void enter_signal_handler() { _num_nested_signal++; } | |
197 void leave_signal_handler() { _num_nested_signal--; } | |
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198 bool is_inside_signal_handler() const { return _num_nested_signal > 0; } |
0 | 199 |
200 private: | |
201 // Debug tracing | |
202 static void trace(const char* msg, const Thread* const thread) PRODUCT_RETURN; | |
203 | |
204 // Active_handles points to a block of handles | |
205 JNIHandleBlock* _active_handles; | |
206 | |
207 // One-element thread local free list | |
208 JNIHandleBlock* _free_handle_block; | |
209 | |
210 // Point to the last handle mark | |
211 HandleMark* _last_handle_mark; | |
212 | |
213 // The parity of the last strong_roots iteration in which this thread was | |
214 // claimed as a task. | |
215 jint _oops_do_parity; | |
216 | |
217 public: | |
218 void set_last_handle_mark(HandleMark* mark) { _last_handle_mark = mark; } | |
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219 HandleMark* last_handle_mark() const { return _last_handle_mark; } |
0 | 220 private: |
221 | |
222 // debug support for checking if code does allow safepoints or not | |
223 // GC points in the VM can happen because of allocation, invoking a VM operation, or blocking on | |
224 // mutex, or blocking on an object synchronizer (Java locking). | |
225 // If !allow_safepoint(), then an assertion failure will happen in any of the above cases | |
226 // If !allow_allocation(), then an assertion failure will happen during allocation | |
227 // (Hence, !allow_safepoint() => !allow_allocation()). | |
228 // | |
229 // The two classes No_Safepoint_Verifier and No_Allocation_Verifier are used to set these counters. | |
230 // | |
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231 NOT_PRODUCT(int _allow_safepoint_count;) // If 0, thread allow a safepoint to happen |
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232 debug_only (int _allow_allocation_count;) // If 0, the thread is allowed to allocate oops. |
0 | 233 |
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234 // Used by SkipGCALot class. |
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235 NOT_PRODUCT(bool _skip_gcalot;) // Should we elide gc-a-lot? |
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236 |
0 | 237 // Record when GC is locked out via the GC_locker mechanism |
238 CHECK_UNHANDLED_OOPS_ONLY(int _gc_locked_out_count;) | |
239 | |
240 friend class No_Alloc_Verifier; | |
241 friend class No_Safepoint_Verifier; | |
242 friend class Pause_No_Safepoint_Verifier; | |
243 friend class ThreadLocalStorage; | |
244 friend class GC_locker; | |
245 | |
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246 ThreadLocalAllocBuffer _tlab; // Thread-local eden |
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247 jlong _allocated_bytes; // Cumulative number of bytes allocated on |
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248 // the Java heap |
0 | 249 |
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250 TRACE_BUFFER _trace_buffer; // Thread-local buffer for tracing |
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251 |
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252 int _vm_operation_started_count; // VM_Operation support |
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253 int _vm_operation_completed_count; // VM_Operation support |
0 | 254 |
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255 ObjectMonitor* _current_pending_monitor; // ObjectMonitor this thread |
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256 // is waiting to lock |
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257 bool _current_pending_monitor_is_from_java; // locking is from Java code |
0 | 258 |
259 // ObjectMonitor on which this thread called Object.wait() | |
260 ObjectMonitor* _current_waiting_monitor; | |
261 | |
262 // Private thread-local objectmonitor list - a simple cache organized as a SLL. | |
263 public: | |
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264 ObjectMonitor* omFreeList; |
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265 int omFreeCount; // length of omFreeList |
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266 int omFreeProvision; // reload chunk size |
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267 ObjectMonitor* omInUseList; // SLL to track monitors in circulation |
1587 | 268 int omInUseCount; // length of omInUseList |
0 | 269 |
270 public: | |
271 enum { | |
272 is_definitely_current_thread = true | |
273 }; | |
274 | |
275 // Constructor | |
276 Thread(); | |
277 virtual ~Thread(); | |
278 | |
279 // initializtion | |
280 void initialize_thread_local_storage(); | |
281 | |
282 // thread entry point | |
283 virtual void run(); | |
284 | |
285 // Testers | |
286 virtual bool is_VM_thread() const { return false; } | |
287 virtual bool is_Java_thread() const { return false; } | |
288 virtual bool is_Compiler_thread() const { return false; } | |
289 virtual bool is_hidden_from_external_view() const { return false; } | |
290 virtual bool is_jvmti_agent_thread() const { return false; } | |
291 // True iff the thread can perform GC operations at a safepoint. | |
292 // Generally will be true only of VM thread and parallel GC WorkGang | |
293 // threads. | |
294 virtual bool is_GC_task_thread() const { return false; } | |
295 virtual bool is_Watcher_thread() const { return false; } | |
296 virtual bool is_ConcurrentGC_thread() const { return false; } | |
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297 virtual bool is_Named_thread() const { return false; } |
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298 virtual bool is_Worker_thread() const { return false; } |
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299 |
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300 // Casts |
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301 virtual WorkerThread* as_Worker_thread() const { return NULL; } |
0 | 302 |
303 virtual char* name() const { return (char*)"Unknown thread"; } | |
304 | |
305 // Returns the current thread | |
306 static inline Thread* current(); | |
307 | |
308 // Common thread operations | |
309 static void set_priority(Thread* thread, ThreadPriority priority); | |
310 static ThreadPriority get_priority(const Thread* const thread); | |
311 static void start(Thread* thread); | |
312 static void interrupt(Thread* thr); | |
313 static bool is_interrupted(Thread* thr, bool clear_interrupted); | |
314 | |
4006 | 315 void set_native_thread_name(const char *name) { |
316 assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread"); | |
317 os::set_native_thread_name(name); | |
318 } | |
319 | |
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320 ObjectMonitor** omInUseList_addr() { return (ObjectMonitor **)&omInUseList; } |
0 | 321 Monitor* SR_lock() const { return _SR_lock; } |
322 | |
323 bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; } | |
324 | |
325 void set_suspend_flag(SuspendFlags f) { | |
326 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
327 uint32_t flags; | |
328 do { | |
329 flags = _suspend_flags; | |
330 } | |
331 while (Atomic::cmpxchg((jint)(flags | f), | |
332 (volatile jint*)&_suspend_flags, | |
333 (jint)flags) != (jint)flags); | |
334 } | |
335 void clear_suspend_flag(SuspendFlags f) { | |
336 assert(sizeof(jint) == sizeof(_suspend_flags), "size mismatch"); | |
337 uint32_t flags; | |
338 do { | |
339 flags = _suspend_flags; | |
340 } | |
341 while (Atomic::cmpxchg((jint)(flags & ~f), | |
342 (volatile jint*)&_suspend_flags, | |
343 (jint)flags) != (jint)flags); | |
344 } | |
345 | |
346 void set_has_async_exception() { | |
347 set_suspend_flag(_has_async_exception); | |
348 } | |
349 void clear_has_async_exception() { | |
350 clear_suspend_flag(_has_async_exception); | |
351 } | |
352 | |
353 // Support for Unhandled Oop detection | |
354 #ifdef CHECK_UNHANDLED_OOPS | |
355 private: | |
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356 UnhandledOops* _unhandled_oops; |
0 | 357 public: |
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358 UnhandledOops* unhandled_oops() { return _unhandled_oops; } |
0 | 359 // Mark oop safe for gc. It may be stack allocated but won't move. |
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360 void allow_unhandled_oop(oop *op) { |
0 | 361 if (CheckUnhandledOops) unhandled_oops()->allow_unhandled_oop(op); |
362 } | |
363 // Clear oops at safepoint so crashes point to unhandled oop violator | |
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364 void clear_unhandled_oops() { |
0 | 365 if (CheckUnhandledOops) unhandled_oops()->clear_unhandled_oops(); |
366 } | |
367 bool is_gc_locked_out() { return _gc_locked_out_count > 0; } | |
368 #endif // CHECK_UNHANDLED_OOPS | |
369 | |
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370 #ifndef PRODUCT |
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371 bool skip_gcalot() { return _skip_gcalot; } |
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372 void set_skip_gcalot(bool v) { _skip_gcalot = v; } |
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373 #endif |
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374 |
0 | 375 public: |
376 // Installs a pending exception to be inserted later | |
377 static void send_async_exception(oop thread_oop, oop java_throwable); | |
378 | |
379 // Resource area | |
380 ResourceArea* resource_area() const { return _resource_area; } | |
381 void set_resource_area(ResourceArea* area) { _resource_area = area; } | |
382 | |
383 OSThread* osthread() const { return _osthread; } | |
384 void set_osthread(OSThread* thread) { _osthread = thread; } | |
385 | |
386 // JNI handle support | |
387 JNIHandleBlock* active_handles() const { return _active_handles; } | |
388 void set_active_handles(JNIHandleBlock* block) { _active_handles = block; } | |
389 JNIHandleBlock* free_handle_block() const { return _free_handle_block; } | |
390 void set_free_handle_block(JNIHandleBlock* block) { _free_handle_block = block; } | |
391 | |
392 // Internal handle support | |
393 HandleArea* handle_area() const { return _handle_area; } | |
394 void set_handle_area(HandleArea* area) { _handle_area = area; } | |
395 | |
396 // Thread-Local Allocation Buffer (TLAB) support | |
397 ThreadLocalAllocBuffer& tlab() { return _tlab; } | |
398 void initialize_tlab() { | |
399 if (UseTLAB) { | |
400 tlab().initialize(); | |
401 } | |
402 } | |
403 | |
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404 jlong allocated_bytes() { return _allocated_bytes; } |
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405 void set_allocated_bytes(jlong value) { _allocated_bytes = value; } |
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406 void incr_allocated_bytes(jlong size) { _allocated_bytes += size; } |
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407 jlong cooked_allocated_bytes() { |
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408 jlong allocated_bytes = OrderAccess::load_acquire(&_allocated_bytes); |
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409 if (UseTLAB) { |
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410 size_t used_bytes = tlab().used_bytes(); |
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411 if ((ssize_t)used_bytes > 0) { |
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412 // More-or-less valid tlab. The load_acquire above should ensure |
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413 // that the result of the add is <= the instantaneous value |
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414 return allocated_bytes + used_bytes; |
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415 } |
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416 } |
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417 return allocated_bytes; |
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418 } |
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419 |
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420 TRACE_BUFFER trace_buffer() { return _trace_buffer; } |
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421 void set_trace_buffer(TRACE_BUFFER buf) { _trace_buffer = buf; } |
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422 |
0 | 423 // VM operation support |
424 int vm_operation_ticket() { return ++_vm_operation_started_count; } | |
425 int vm_operation_completed_count() { return _vm_operation_completed_count; } | |
426 void increment_vm_operation_completed_count() { _vm_operation_completed_count++; } | |
427 | |
428 // For tracking the heavyweight monitor the thread is pending on. | |
429 ObjectMonitor* current_pending_monitor() { | |
430 return _current_pending_monitor; | |
431 } | |
432 void set_current_pending_monitor(ObjectMonitor* monitor) { | |
433 _current_pending_monitor = monitor; | |
434 } | |
435 void set_current_pending_monitor_is_from_java(bool from_java) { | |
436 _current_pending_monitor_is_from_java = from_java; | |
437 } | |
438 bool current_pending_monitor_is_from_java() { | |
439 return _current_pending_monitor_is_from_java; | |
440 } | |
441 | |
442 // For tracking the ObjectMonitor on which this thread called Object.wait() | |
443 ObjectMonitor* current_waiting_monitor() { | |
444 return _current_waiting_monitor; | |
445 } | |
446 void set_current_waiting_monitor(ObjectMonitor* monitor) { | |
447 _current_waiting_monitor = monitor; | |
448 } | |
449 | |
450 // GC support | |
451 // Apply "f->do_oop" to all root oops in "this". | |
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452 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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453 virtual void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 454 |
455 // Handles the parallel case for the method below. | |
456 private: | |
457 bool claim_oops_do_par_case(int collection_parity); | |
458 public: | |
459 // Requires that "collection_parity" is that of the current strong roots | |
460 // iteration. If "is_par" is false, sets the parity of "this" to | |
461 // "collection_parity", and returns "true". If "is_par" is true, | |
462 // uses an atomic instruction to set the current threads parity to | |
463 // "collection_parity", if it is not already. Returns "true" iff the | |
464 // calling thread does the update, this indicates that the calling thread | |
465 // has claimed the thread's stack as a root groop in the current | |
466 // collection. | |
467 bool claim_oops_do(bool is_par, int collection_parity) { | |
468 if (!is_par) { | |
469 _oops_do_parity = collection_parity; | |
470 return true; | |
471 } else { | |
472 return claim_oops_do_par_case(collection_parity); | |
473 } | |
474 } | |
475 | |
476 // Sweeper support | |
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477 void nmethods_do(CodeBlobClosure* cf); |
0 | 478 |
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479 // Used by fast lock support |
0 | 480 virtual bool is_lock_owned(address adr) const; |
481 | |
482 // Check if address is in the stack of the thread (not just for locks). | |
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483 // Warning: the method can only be used on the running thread |
0 | 484 bool is_in_stack(address adr) const; |
485 | |
486 // Sets this thread as starting thread. Returns failure if thread | |
487 // creation fails due to lack of memory, too many threads etc. | |
488 bool set_as_starting_thread(); | |
489 | |
490 protected: | |
491 // OS data associated with the thread | |
492 OSThread* _osthread; // Platform-specific thread information | |
493 | |
494 // Thread local resource area for temporary allocation within the VM | |
495 ResourceArea* _resource_area; | |
496 | |
497 // Thread local handle area for allocation of handles within the VM | |
498 HandleArea* _handle_area; | |
499 | |
500 // Support for stack overflow handling, get_thread, etc. | |
501 address _stack_base; | |
502 size_t _stack_size; | |
503 uintptr_t _self_raw_id; // used by get_thread (mutable) | |
504 int _lgrp_id; | |
505 | |
506 public: | |
507 // Stack overflow support | |
508 address stack_base() const { assert(_stack_base != NULL,"Sanity check"); return _stack_base; } | |
509 | |
510 void set_stack_base(address base) { _stack_base = base; } | |
511 size_t stack_size() const { return _stack_size; } | |
512 void set_stack_size(size_t size) { _stack_size = size; } | |
513 void record_stack_base_and_size(); | |
514 | |
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515 bool on_local_stack(address adr) const { |
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516 /* QQQ this has knowledge of direction, ought to be a stack method */ |
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517 return (_stack_base >= adr && adr >= (_stack_base - _stack_size)); |
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518 } |
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519 |
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520 uintptr_t self_raw_id() { return _self_raw_id; } |
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521 void set_self_raw_id(uintptr_t value) { _self_raw_id = value; } |
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522 |
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523 int lgrp_id() const { return _lgrp_id; } |
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524 void set_lgrp_id(int value) { _lgrp_id = value; } |
0 | 525 |
526 // Printing | |
527 void print_on(outputStream* st) const; | |
528 void print() const { print_on(tty); } | |
529 virtual void print_on_error(outputStream* st, char* buf, int buflen) const; | |
530 | |
531 // Debug-only code | |
532 | |
533 #ifdef ASSERT | |
534 private: | |
535 // Deadlock detection support for Mutex locks. List of locks own by thread. | |
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536 Monitor* _owned_locks; |
0 | 537 // Mutex::set_owner_implementation is the only place where _owned_locks is modified, |
538 // thus the friendship | |
539 friend class Mutex; | |
540 friend class Monitor; | |
541 | |
542 public: | |
543 void print_owned_locks_on(outputStream* st) const; | |
544 void print_owned_locks() const { print_owned_locks_on(tty); } | |
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545 Monitor* owned_locks() const { return _owned_locks; } |
0 | 546 bool owns_locks() const { return owned_locks() != NULL; } |
547 bool owns_locks_but_compiled_lock() const; | |
548 | |
549 // Deadlock detection | |
550 bool allow_allocation() { return _allow_allocation_count == 0; } | |
551 #endif | |
552 | |
553 void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN; | |
554 | |
555 private: | |
556 volatile int _jvmti_env_iteration_count; | |
557 | |
558 public: | |
559 void entering_jvmti_env_iteration() { ++_jvmti_env_iteration_count; } | |
560 void leaving_jvmti_env_iteration() { --_jvmti_env_iteration_count; } | |
561 bool is_inside_jvmti_env_iteration() { return _jvmti_env_iteration_count > 0; } | |
562 | |
563 // Code generation | |
564 static ByteSize exception_file_offset() { return byte_offset_of(Thread, _exception_file ); } | |
565 static ByteSize exception_line_offset() { return byte_offset_of(Thread, _exception_line ); } | |
566 static ByteSize active_handles_offset() { return byte_offset_of(Thread, _active_handles ); } | |
567 | |
568 static ByteSize stack_base_offset() { return byte_offset_of(Thread, _stack_base ); } | |
569 static ByteSize stack_size_offset() { return byte_offset_of(Thread, _stack_size ); } | |
570 | |
571 #define TLAB_FIELD_OFFSET(name) \ | |
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572 static ByteSize tlab_##name##_offset() { return byte_offset_of(Thread, _tlab) + ThreadLocalAllocBuffer::name##_offset(); } |
0 | 573 |
574 TLAB_FIELD_OFFSET(start) | |
575 TLAB_FIELD_OFFSET(end) | |
576 TLAB_FIELD_OFFSET(top) | |
577 TLAB_FIELD_OFFSET(pf_top) | |
578 TLAB_FIELD_OFFSET(size) // desired_size | |
579 TLAB_FIELD_OFFSET(refill_waste_limit) | |
580 TLAB_FIELD_OFFSET(number_of_refills) | |
581 TLAB_FIELD_OFFSET(fast_refill_waste) | |
582 TLAB_FIELD_OFFSET(slow_allocations) | |
583 | |
584 #undef TLAB_FIELD_OFFSET | |
585 | |
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586 static ByteSize allocated_bytes_offset() { return byte_offset_of(Thread, _allocated_bytes ); } |
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587 |
0 | 588 public: |
589 volatile intptr_t _Stalled ; | |
590 volatile int _TypeTag ; | |
591 ParkEvent * _ParkEvent ; // for synchronized() | |
592 ParkEvent * _SleepEvent ; // for Thread.sleep | |
593 ParkEvent * _MutexEvent ; // for native internal Mutex/Monitor | |
594 ParkEvent * _MuxEvent ; // for low-level muxAcquire-muxRelease | |
595 int NativeSyncRecursion ; // diagnostic | |
596 | |
597 volatile int _OnTrap ; // Resume-at IP delta | |
598 jint _hashStateW ; // Marsaglia Shift-XOR thread-local RNG | |
599 jint _hashStateX ; // thread-specific hashCode generator state | |
600 jint _hashStateY ; | |
601 jint _hashStateZ ; | |
602 void * _schedctl ; | |
603 | |
604 intptr_t _ScratchA, _ScratchB ; // Scratch locations for fast-path sync code | |
605 static ByteSize ScratchA_offset() { return byte_offset_of(Thread, _ScratchA ); } | |
606 static ByteSize ScratchB_offset() { return byte_offset_of(Thread, _ScratchB ); } | |
607 | |
608 volatile jint rng [4] ; // RNG for spin loop | |
609 | |
610 // Low-level leaf-lock primitives used to implement synchronization | |
611 // and native monitor-mutex infrastructure. | |
612 // Not for general synchronization use. | |
613 static void SpinAcquire (volatile int * Lock, const char * Name) ; | |
614 static void SpinRelease (volatile int * Lock) ; | |
615 static void muxAcquire (volatile intptr_t * Lock, const char * Name) ; | |
616 static void muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) ; | |
617 static void muxRelease (volatile intptr_t * Lock) ; | |
618 }; | |
619 | |
620 // Inline implementation of Thread::current() | |
621 // Thread::current is "hot" it's called > 128K times in the 1st 500 msecs of | |
622 // startup. | |
623 // ThreadLocalStorage::thread is warm -- it's called > 16K times in the same | |
624 // period. This is inlined in thread_<os_family>.inline.hpp. | |
625 | |
626 inline Thread* Thread::current() { | |
627 #ifdef ASSERT | |
628 // This function is very high traffic. Define PARANOID to enable expensive | |
629 // asserts. | |
630 #ifdef PARANOID | |
631 // Signal handler should call ThreadLocalStorage::get_thread_slow() | |
632 Thread* t = ThreadLocalStorage::get_thread_slow(); | |
633 assert(t != NULL && !t->is_inside_signal_handler(), | |
634 "Don't use Thread::current() inside signal handler"); | |
635 #endif | |
636 #endif | |
637 Thread* thread = ThreadLocalStorage::thread(); | |
638 assert(thread != NULL, "just checking"); | |
639 return thread; | |
640 } | |
641 | |
642 // Name support for threads. non-JavaThread subclasses with multiple | |
643 // uniquely named instances should derive from this. | |
644 class NamedThread: public Thread { | |
645 friend class VMStructs; | |
646 enum { | |
647 max_name_len = 64 | |
648 }; | |
649 private: | |
650 char* _name; | |
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651 // log JavaThread being processed by oops_do |
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652 JavaThread* _processed_thread; |
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653 |
0 | 654 public: |
655 NamedThread(); | |
656 ~NamedThread(); | |
657 // May only be called once per thread. | |
658 void set_name(const char* format, ...); | |
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659 virtual bool is_Named_thread() const { return true; } |
0 | 660 virtual char* name() const { return _name == NULL ? (char*)"Unknown Thread" : _name; } |
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661 JavaThread *processed_thread() { return _processed_thread; } |
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662 void set_processed_thread(JavaThread *thread) { _processed_thread = thread; } |
0 | 663 }; |
664 | |
665 // Worker threads are named and have an id of an assigned work. | |
666 class WorkerThread: public NamedThread { | |
667 private: | |
668 uint _id; | |
669 public: | |
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670 WorkerThread() : _id(0) { } |
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671 virtual bool is_Worker_thread() const { return true; } |
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672 |
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673 virtual WorkerThread* as_Worker_thread() const { |
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674 assert(is_Worker_thread(), "Dubious cast to WorkerThread*?"); |
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675 return (WorkerThread*) this; |
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676 } |
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677 |
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678 void set_id(uint work_id) { _id = work_id; } |
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679 uint id() const { return _id; } |
0 | 680 }; |
681 | |
682 // A single WatcherThread is used for simulating timer interrupts. | |
683 class WatcherThread: public Thread { | |
684 friend class VMStructs; | |
685 public: | |
686 virtual void run(); | |
687 | |
688 private: | |
689 static WatcherThread* _watcher_thread; | |
690 | |
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691 volatile static bool _should_terminate; // updated without holding lock |
0 | 692 public: |
693 enum SomeConstants { | |
694 delay_interval = 10 // interrupt delay in milliseconds | |
695 }; | |
696 | |
697 // Constructor | |
698 WatcherThread(); | |
699 | |
700 // Tester | |
701 bool is_Watcher_thread() const { return true; } | |
702 | |
703 // Printing | |
704 char* name() const { return (char*)"VM Periodic Task Thread"; } | |
705 void print_on(outputStream* st) const; | |
706 void print() const { print_on(tty); } | |
707 | |
708 // Returns the single instance of WatcherThread | |
709 static WatcherThread* watcher_thread() { return _watcher_thread; } | |
710 | |
711 // Create and start the single instance of WatcherThread, or stop it on shutdown | |
712 static void start(); | |
713 static void stop(); | |
714 }; | |
715 | |
716 | |
717 class CompilerThread; | |
718 | |
719 typedef void (*ThreadFunction)(JavaThread*, TRAPS); | |
720 | |
721 class JavaThread: public Thread { | |
722 friend class VMStructs; | |
723 private: | |
724 JavaThread* _next; // The next thread in the Threads list | |
725 oop _threadObj; // The Java level thread object | |
726 | |
727 #ifdef ASSERT | |
728 private: | |
729 int _java_call_counter; | |
730 | |
731 public: | |
732 int java_call_counter() { return _java_call_counter; } | |
733 void inc_java_call_counter() { _java_call_counter++; } | |
734 void dec_java_call_counter() { | |
735 assert(_java_call_counter > 0, "Invalid nesting of JavaCallWrapper"); | |
736 _java_call_counter--; | |
737 } | |
738 private: // restore original namespace restriction | |
739 #endif // ifdef ASSERT | |
740 | |
741 #ifndef PRODUCT | |
742 public: | |
743 enum { | |
744 jump_ring_buffer_size = 16 | |
745 }; | |
746 private: // restore original namespace restriction | |
747 #endif | |
748 | |
749 JavaFrameAnchor _anchor; // Encapsulation of current java frame and it state | |
750 | |
751 ThreadFunction _entry_point; | |
752 | |
753 JNIEnv _jni_environment; | |
754 | |
755 // Deopt support | |
756 DeoptResourceMark* _deopt_mark; // Holds special ResourceMark for deoptimization | |
757 | |
758 intptr_t* _must_deopt_id; // id of frame that needs to be deopted once we | |
759 // transition out of native | |
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760 nmethod* _deopt_nmethod; // nmethod that is currently being deoptimized |
0 | 761 vframeArray* _vframe_array_head; // Holds the heap of the active vframeArrays |
762 vframeArray* _vframe_array_last; // Holds last vFrameArray we popped | |
763 // Because deoptimization is lazy we must save jvmti requests to set locals | |
764 // in compiled frames until we deoptimize and we have an interpreter frame. | |
765 // This holds the pointer to array (yeah like there might be more than one) of | |
766 // description of compiled vframes that have locals that need to be updated. | |
767 GrowableArray<jvmtiDeferredLocalVariableSet*>* _deferred_locals_updates; | |
768 | |
769 // Handshake value for fixing 6243940. We need a place for the i2c | |
770 // adapter to store the callee methodOop. This value is NEVER live | |
771 // across a gc point so it does NOT have to be gc'd | |
772 // The handshake is open ended since we can't be certain that it will | |
773 // be NULLed. This is because we rarely ever see the race and end up | |
774 // in handle_wrong_method which is the backend of the handshake. See | |
775 // code in i2c adapters and handle_wrong_method. | |
776 | |
777 methodOop _callee_target; | |
778 | |
779 // Oop results of VM runtime calls | |
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780 oop _vm_result; // Used to pass back an oop result into Java code, GC-preserved |
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781 oop _vm_result_2; // Used to pass back an oop result into Java code, GC-preserved |
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782 |
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783 // See ReduceInitialCardMarks: this holds the precise space interval of |
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784 // the most recent slow path allocation for which compiled code has |
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785 // elided card-marks for performance along the fast-path. |
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786 MemRegion _deferred_card_mark; |
0 | 787 |
788 MonitorChunk* _monitor_chunks; // Contains the off stack monitors | |
789 // allocated during deoptimization | |
790 // and by JNI_MonitorEnter/Exit | |
791 | |
792 // Async. requests support | |
793 enum AsyncRequests { | |
794 _no_async_condition = 0, | |
795 _async_exception, | |
796 _async_unsafe_access_error | |
797 }; | |
798 AsyncRequests _special_runtime_exit_condition; // Enum indicating pending async. request | |
799 oop _pending_async_exception; | |
800 | |
801 // Safepoint support | |
802 public: // Expose _thread_state for SafeFetchInt() | |
803 volatile JavaThreadState _thread_state; | |
804 private: | |
805 ThreadSafepointState *_safepoint_state; // Holds information about a thread during a safepoint | |
806 address _saved_exception_pc; // Saved pc of instruction where last implicit exception happened | |
807 | |
808 // JavaThread termination support | |
809 enum TerminatedTypes { | |
810 _not_terminated = 0xDEAD - 2, | |
811 _thread_exiting, // JavaThread::exit() has been called for this thread | |
812 _thread_terminated, // JavaThread is removed from thread list | |
813 _vm_exited // JavaThread is still executing native code, but VM is terminated | |
814 // only VM_Exit can set _vm_exited | |
815 }; | |
816 | |
817 // In general a JavaThread's _terminated field transitions as follows: | |
818 // | |
819 // _not_terminated => _thread_exiting => _thread_terminated | |
820 // | |
821 // _vm_exited is a special value to cover the case of a JavaThread | |
822 // executing native code after the VM itself is terminated. | |
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823 volatile TerminatedTypes _terminated; |
0 | 824 // suspend/resume support |
825 volatile bool _suspend_equivalent; // Suspend equivalent condition | |
826 jint _in_deopt_handler; // count of deoptimization | |
827 // handlers thread is in | |
828 volatile bool _doing_unsafe_access; // Thread may fault due to unsafe access | |
829 bool _do_not_unlock_if_synchronized; // Do not unlock the receiver of a synchronized method (since it was | |
830 // never locked) when throwing an exception. Used by interpreter only. | |
831 | |
4006 | 832 // JNI attach states: |
833 enum JNIAttachStates { | |
834 _not_attaching_via_jni = 1, // thread is not attaching via JNI | |
835 _attaching_via_jni, // thread is attaching via JNI | |
836 _attached_via_jni // thread has attached via JNI | |
837 }; | |
838 | |
839 // A regular JavaThread's _jni_attach_state is _not_attaching_via_jni. | |
840 // A native thread that is attaching via JNI starts with a value | |
841 // of _attaching_via_jni and transitions to _attached_via_jni. | |
842 volatile JNIAttachStates _jni_attach_state; | |
0 | 843 |
844 public: | |
845 // State of the stack guard pages for this thread. | |
846 enum StackGuardState { | |
847 stack_guard_unused, // not needed | |
848 stack_guard_yellow_disabled,// disabled (temporarily) after stack overflow | |
849 stack_guard_enabled // enabled | |
850 }; | |
851 | |
852 private: | |
853 | |
854 StackGuardState _stack_guard_state; | |
855 | |
856 // Compiler exception handling (NOTE: The _exception_oop is *NOT* the same as _pending_exception. It is | |
857 // used to temp. parsing values into and out of the runtime system during exception handling for compiled | |
858 // code) | |
859 volatile oop _exception_oop; // Exception thrown in compiled code | |
860 volatile address _exception_pc; // PC where exception happened | |
861 volatile address _exception_handler_pc; // PC for handler of exception | |
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862 volatile int _is_method_handle_return; // true (== 1) if the current exception PC is a MethodHandle call site. |
0 | 863 |
864 // support for compilation | |
865 bool _is_compiling; // is true if a compilation is active inthis thread (one compilation per thread possible) | |
866 | |
867 // support for JNI critical regions | |
868 jint _jni_active_critical; // count of entries into JNI critical region | |
869 | |
870 // For deadlock detection. | |
871 int _depth_first_number; | |
872 | |
873 // JVMTI PopFrame support | |
874 // This is set to popframe_pending to signal that top Java frame should be popped immediately | |
875 int _popframe_condition; | |
876 | |
877 #ifndef PRODUCT | |
878 int _jmp_ring_index; | |
879 struct { | |
880 // We use intptr_t instead of address so debugger doesn't try and display strings | |
881 intptr_t _target; | |
882 intptr_t _instruction; | |
883 const char* _file; | |
884 int _line; | |
885 } _jmp_ring[ jump_ring_buffer_size ]; | |
886 #endif /* PRODUCT */ | |
887 | |
342 | 888 #ifndef SERIALGC |
889 // Support for G1 barriers | |
890 | |
891 ObjPtrQueue _satb_mark_queue; // Thread-local log for SATB barrier. | |
892 // Set of all such queues. | |
893 static SATBMarkQueueSet _satb_mark_queue_set; | |
894 | |
895 DirtyCardQueue _dirty_card_queue; // Thread-local log for dirty cards. | |
896 // Set of all such queues. | |
897 static DirtyCardQueueSet _dirty_card_queue_set; | |
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898 |
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899 void flush_barrier_queues(); |
342 | 900 #endif // !SERIALGC |
901 | |
0 | 902 friend class VMThread; |
903 friend class ThreadWaitTransition; | |
904 friend class VM_Exit; | |
905 | |
906 void initialize(); // Initialized the instance variables | |
907 | |
908 public: | |
909 // Constructor | |
4006 | 910 JavaThread(bool is_attaching_via_jni = false); // for main thread and JNI attached threads |
0 | 911 JavaThread(ThreadFunction entry_point, size_t stack_size = 0); |
912 ~JavaThread(); | |
913 | |
914 #ifdef ASSERT | |
915 // verify this JavaThread hasn't be published in the Threads::list yet | |
916 void verify_not_published(); | |
917 #endif | |
918 | |
919 //JNI functiontable getter/setter for JVMTI jni function table interception API. | |
920 void set_jni_functions(struct JNINativeInterface_* functionTable) { | |
921 _jni_environment.functions = functionTable; | |
922 } | |
923 struct JNINativeInterface_* get_jni_functions() { | |
924 return (struct JNINativeInterface_ *)_jni_environment.functions; | |
925 } | |
926 | |
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927 // This function is called at thread creation to allow |
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928 // platform specific thread variables to be initialized. |
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929 void cache_global_variables(); |
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930 |
0 | 931 // Executes Shutdown.shutdown() |
932 void invoke_shutdown_hooks(); | |
933 | |
934 // Cleanup on thread exit | |
935 enum ExitType { | |
936 normal_exit, | |
937 jni_detach | |
938 }; | |
939 void exit(bool destroy_vm, ExitType exit_type = normal_exit); | |
940 | |
941 void cleanup_failed_attach_current_thread(); | |
942 | |
943 // Testers | |
944 virtual bool is_Java_thread() const { return true; } | |
945 | |
946 // compilation | |
947 void set_is_compiling(bool f) { _is_compiling = f; } | |
948 bool is_compiling() const { return _is_compiling; } | |
949 | |
950 // Thread chain operations | |
951 JavaThread* next() const { return _next; } | |
952 void set_next(JavaThread* p) { _next = p; } | |
953 | |
954 // Thread oop. threadObj() can be NULL for initial JavaThread | |
955 // (or for threads attached via JNI) | |
956 oop threadObj() const { return _threadObj; } | |
957 void set_threadObj(oop p) { _threadObj = p; } | |
958 | |
959 ThreadPriority java_priority() const; // Read from threadObj() | |
960 | |
961 // Prepare thread and add to priority queue. If a priority is | |
962 // not specified, use the priority of the thread object. Threads_lock | |
963 // must be held while this function is called. | |
964 void prepare(jobject jni_thread, ThreadPriority prio=NoPriority); | |
965 | |
966 void set_saved_exception_pc(address pc) { _saved_exception_pc = pc; } | |
967 address saved_exception_pc() { return _saved_exception_pc; } | |
968 | |
969 | |
970 ThreadFunction entry_point() const { return _entry_point; } | |
971 | |
972 // Allocates a new Java level thread object for this thread. thread_name may be NULL. | |
973 void allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS); | |
974 | |
975 // Last frame anchor routines | |
976 | |
977 JavaFrameAnchor* frame_anchor(void) { return &_anchor; } | |
978 | |
979 // last_Java_sp | |
980 bool has_last_Java_frame() const { return _anchor.has_last_Java_frame(); } | |
981 intptr_t* last_Java_sp() const { return _anchor.last_Java_sp(); } | |
982 | |
983 // last_Java_pc | |
984 | |
985 address last_Java_pc(void) { return _anchor.last_Java_pc(); } | |
986 | |
987 // Safepoint support | |
988 JavaThreadState thread_state() const { return _thread_state; } | |
989 void set_thread_state(JavaThreadState s) { _thread_state=s; } | |
990 ThreadSafepointState *safepoint_state() const { return _safepoint_state; } | |
991 void set_safepoint_state(ThreadSafepointState *state) { _safepoint_state = state; } | |
992 bool is_at_poll_safepoint() { return _safepoint_state->is_at_poll_safepoint(); } | |
993 | |
994 // thread has called JavaThread::exit() or is terminated | |
995 bool is_exiting() { return _terminated == _thread_exiting || is_terminated(); } | |
996 // thread is terminated (no longer on the threads list); we compare | |
997 // against the two non-terminated values so that a freed JavaThread | |
998 // will also be considered terminated. | |
999 bool is_terminated() { return _terminated != _not_terminated && _terminated != _thread_exiting; } | |
1000 void set_terminated(TerminatedTypes t) { _terminated = t; } | |
1001 // special for Threads::remove() which is static: | |
1002 void set_terminated_value() { _terminated = _thread_terminated; } | |
1003 void block_if_vm_exited(); | |
1004 | |
1005 bool doing_unsafe_access() { return _doing_unsafe_access; } | |
1006 void set_doing_unsafe_access(bool val) { _doing_unsafe_access = val; } | |
1007 | |
1008 bool do_not_unlock_if_synchronized() { return _do_not_unlock_if_synchronized; } | |
1009 void set_do_not_unlock_if_synchronized(bool val) { _do_not_unlock_if_synchronized = val; } | |
1010 | |
1011 | |
1012 // Suspend/resume support for JavaThread | |
1013 | |
1014 private: | |
1015 void set_ext_suspended() { set_suspend_flag (_ext_suspended); } | |
1016 void clear_ext_suspended() { clear_suspend_flag(_ext_suspended); } | |
1017 | |
1018 public: | |
1019 void java_suspend(); | |
1020 void java_resume(); | |
1021 int java_suspend_self(); | |
1022 | |
1023 void check_and_wait_while_suspended() { | |
1024 assert(JavaThread::current() == this, "sanity check"); | |
1025 | |
1026 bool do_self_suspend; | |
1027 do { | |
1028 // were we externally suspended while we were waiting? | |
1029 do_self_suspend = handle_special_suspend_equivalent_condition(); | |
1030 if (do_self_suspend) { | |
1031 // don't surprise the thread that suspended us by returning | |
1032 java_suspend_self(); | |
1033 set_suspend_equivalent(); | |
1034 } | |
1035 } while (do_self_suspend); | |
1036 } | |
1037 static void check_safepoint_and_suspend_for_native_trans(JavaThread *thread); | |
1038 // Check for async exception in addition to safepoint and suspend request. | |
1039 static void check_special_condition_for_native_trans(JavaThread *thread); | |
1040 | |
1041 bool is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits); | |
1042 bool is_ext_suspend_completed_with_lock(uint32_t *bits) { | |
1043 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1044 // Warning: is_ext_suspend_completed() may temporarily drop the | |
1045 // SR_lock to allow the thread to reach a stable thread state if | |
1046 // it is currently in a transient thread state. | |
1047 return is_ext_suspend_completed(false /*!called_by_wait */, | |
1048 SuspendRetryDelay, bits); | |
1049 } | |
1050 | |
1051 // We cannot allow wait_for_ext_suspend_completion() to run forever or | |
1052 // we could hang. SuspendRetryCount and SuspendRetryDelay are normally | |
1053 // passed as the count and delay parameters. Experiments with specific | |
1054 // calls to wait_for_ext_suspend_completion() can be done by passing | |
1055 // other values in the code. Experiments with all calls can be done | |
1056 // via the appropriate -XX options. | |
1057 bool wait_for_ext_suspend_completion(int count, int delay, uint32_t *bits); | |
1058 | |
1059 void set_external_suspend() { set_suspend_flag (_external_suspend); } | |
1060 void clear_external_suspend() { clear_suspend_flag(_external_suspend); } | |
1061 | |
1062 void set_deopt_suspend() { set_suspend_flag (_deopt_suspend); } | |
1063 void clear_deopt_suspend() { clear_suspend_flag(_deopt_suspend); } | |
1064 bool is_deopt_suspend() { return (_suspend_flags & _deopt_suspend) != 0; } | |
1065 | |
1066 bool is_external_suspend() const { | |
1067 return (_suspend_flags & _external_suspend) != 0; | |
1068 } | |
1069 // Whenever a thread transitions from native to vm/java it must suspend | |
1070 // if external|deopt suspend is present. | |
1071 bool is_suspend_after_native() const { | |
1072 return (_suspend_flags & (_external_suspend | _deopt_suspend) ) != 0; | |
1073 } | |
1074 | |
1075 // external suspend request is completed | |
1076 bool is_ext_suspended() const { | |
1077 return (_suspend_flags & _ext_suspended) != 0; | |
1078 } | |
1079 | |
1080 bool is_external_suspend_with_lock() const { | |
1081 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1082 return is_external_suspend(); | |
1083 } | |
1084 | |
1085 // Special method to handle a pending external suspend request | |
1086 // when a suspend equivalent condition lifts. | |
1087 bool handle_special_suspend_equivalent_condition() { | |
1088 assert(is_suspend_equivalent(), | |
1089 "should only be called in a suspend equivalence condition"); | |
1090 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1091 bool ret = is_external_suspend(); | |
1092 if (!ret) { | |
1093 // not about to self-suspend so clear suspend equivalence | |
1094 clear_suspend_equivalent(); | |
1095 } | |
1096 // implied else: | |
1097 // We have a pending external suspend request so we leave the | |
1098 // suspend_equivalent flag set until java_suspend_self() sets | |
1099 // the ext_suspended flag and clears the suspend_equivalent | |
1100 // flag. This insures that wait_for_ext_suspend_completion() | |
1101 // will return consistent values. | |
1102 return ret; | |
1103 } | |
1104 | |
1105 // utility methods to see if we are doing some kind of suspension | |
1106 bool is_being_ext_suspended() const { | |
1107 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1108 return is_ext_suspended() || is_external_suspend(); | |
1109 } | |
1110 | |
1111 bool is_suspend_equivalent() const { return _suspend_equivalent; } | |
1112 | |
1113 void set_suspend_equivalent() { _suspend_equivalent = true; }; | |
1114 void clear_suspend_equivalent() { _suspend_equivalent = false; }; | |
1115 | |
1116 // Thread.stop support | |
1117 void send_thread_stop(oop throwable); | |
1118 AsyncRequests clear_special_runtime_exit_condition() { | |
1119 AsyncRequests x = _special_runtime_exit_condition; | |
1120 _special_runtime_exit_condition = _no_async_condition; | |
1121 return x; | |
1122 } | |
1123 | |
1124 // Are any async conditions present? | |
1125 bool has_async_condition() { return (_special_runtime_exit_condition != _no_async_condition); } | |
1126 | |
1127 void check_and_handle_async_exceptions(bool check_unsafe_error = true); | |
1128 | |
1129 // these next two are also used for self-suspension and async exception support | |
1130 void handle_special_runtime_exit_condition(bool check_asyncs = true); | |
1131 | |
1132 // Return true if JavaThread has an asynchronous condition or | |
1133 // if external suspension is requested. | |
1134 bool has_special_runtime_exit_condition() { | |
1135 // We call is_external_suspend() last since external suspend should | |
1136 // be less common. Because we don't use is_external_suspend_with_lock | |
1137 // it is possible that we won't see an asynchronous external suspend | |
1138 // request that has just gotten started, i.e., SR_lock grabbed but | |
1139 // _external_suspend field change either not made yet or not visible | |
1140 // yet. However, this is okay because the request is asynchronous and | |
1141 // we will see the new flag value the next time through. It's also | |
1142 // possible that the external suspend request is dropped after | |
1143 // we have checked is_external_suspend(), we will recheck its value | |
1144 // under SR_lock in java_suspend_self(). | |
1145 return (_special_runtime_exit_condition != _no_async_condition) || | |
1146 is_external_suspend() || is_deopt_suspend(); | |
1147 } | |
1148 | |
1149 void set_pending_unsafe_access_error() { _special_runtime_exit_condition = _async_unsafe_access_error; } | |
1150 | |
1151 void set_pending_async_exception(oop e) { | |
1152 _pending_async_exception = e; | |
1153 _special_runtime_exit_condition = _async_exception; | |
1154 set_has_async_exception(); | |
1155 } | |
1156 | |
1157 // Fast-locking support | |
1158 bool is_lock_owned(address adr) const; | |
1159 | |
1160 // Accessors for vframe array top | |
1161 // The linked list of vframe arrays are sorted on sp. This means when we | |
1162 // unpack the head must contain the vframe array to unpack. | |
1163 void set_vframe_array_head(vframeArray* value) { _vframe_array_head = value; } | |
1164 vframeArray* vframe_array_head() const { return _vframe_array_head; } | |
1165 | |
1166 // Side structure for defering update of java frame locals until deopt occurs | |
1167 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred_locals() const { return _deferred_locals_updates; } | |
1168 void set_deferred_locals(GrowableArray<jvmtiDeferredLocalVariableSet *>* vf) { _deferred_locals_updates = vf; } | |
1169 | |
1170 // These only really exist to make debugging deopt problems simpler | |
1171 | |
1172 void set_vframe_array_last(vframeArray* value) { _vframe_array_last = value; } | |
1173 vframeArray* vframe_array_last() const { return _vframe_array_last; } | |
1174 | |
1175 // The special resourceMark used during deoptimization | |
1176 | |
1177 void set_deopt_mark(DeoptResourceMark* value) { _deopt_mark = value; } | |
1178 DeoptResourceMark* deopt_mark(void) { return _deopt_mark; } | |
1179 | |
1180 intptr_t* must_deopt_id() { return _must_deopt_id; } | |
1181 void set_must_deopt_id(intptr_t* id) { _must_deopt_id = id; } | |
1182 void clear_must_deopt_id() { _must_deopt_id = NULL; } | |
1183 | |
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1184 void set_deopt_nmethod(nmethod* nm) { _deopt_nmethod = nm; } |
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1185 nmethod* deopt_nmethod() { return _deopt_nmethod; } |
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1186 |
0 | 1187 methodOop callee_target() const { return _callee_target; } |
1188 void set_callee_target (methodOop x) { _callee_target = x; } | |
1189 | |
1190 // Oop results of vm runtime calls | |
1191 oop vm_result() const { return _vm_result; } | |
1192 void set_vm_result (oop x) { _vm_result = x; } | |
1193 | |
1194 oop vm_result_2() const { return _vm_result_2; } | |
1195 void set_vm_result_2 (oop x) { _vm_result_2 = x; } | |
1196 | |
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1197 MemRegion deferred_card_mark() const { return _deferred_card_mark; } |
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1198 void set_deferred_card_mark(MemRegion mr) { _deferred_card_mark = mr; } |
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1199 |
0 | 1200 // Exception handling for compiled methods |
1201 oop exception_oop() const { return _exception_oop; } | |
1202 address exception_pc() const { return _exception_pc; } | |
1203 address exception_handler_pc() const { return _exception_handler_pc; } | |
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1204 bool is_method_handle_return() const { return _is_method_handle_return == 1; } |
0 | 1205 |
1206 void set_exception_oop(oop o) { _exception_oop = o; } | |
1207 void set_exception_pc(address a) { _exception_pc = a; } | |
1208 void set_exception_handler_pc(address a) { _exception_handler_pc = a; } | |
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1209 void set_is_method_handle_return(bool value) { _is_method_handle_return = value ? 1 : 0; } |
0 | 1210 |
1211 // Stack overflow support | |
1212 inline size_t stack_available(address cur_sp); | |
1213 address stack_yellow_zone_base() | |
1214 { return (address)(stack_base() - (stack_size() - (stack_red_zone_size() + stack_yellow_zone_size()))); } | |
1215 size_t stack_yellow_zone_size() | |
1216 { return StackYellowPages * os::vm_page_size(); } | |
1217 address stack_red_zone_base() | |
1218 { return (address)(stack_base() - (stack_size() - stack_red_zone_size())); } | |
1219 size_t stack_red_zone_size() | |
1220 { return StackRedPages * os::vm_page_size(); } | |
1221 bool in_stack_yellow_zone(address a) | |
1222 { return (a <= stack_yellow_zone_base()) && (a >= stack_red_zone_base()); } | |
1223 bool in_stack_red_zone(address a) | |
1224 { return (a <= stack_red_zone_base()) && (a >= (address)((intptr_t)stack_base() - stack_size())); } | |
1225 | |
1226 void create_stack_guard_pages(); | |
1227 void remove_stack_guard_pages(); | |
1228 | |
1229 void enable_stack_yellow_zone(); | |
1230 void disable_stack_yellow_zone(); | |
1231 void enable_stack_red_zone(); | |
1232 void disable_stack_red_zone(); | |
1233 | |
1234 inline bool stack_yellow_zone_disabled(); | |
1235 inline bool stack_yellow_zone_enabled(); | |
1236 | |
1237 // Attempt to reguard the stack after a stack overflow may have occurred. | |
1238 // Returns true if (a) guard pages are not needed on this thread, (b) the | |
1239 // pages are already guarded, or (c) the pages were successfully reguarded. | |
1240 // Returns false if there is not enough stack space to reguard the pages, in | |
1241 // which case the caller should unwind a frame and try again. The argument | |
1242 // should be the caller's (approximate) sp. | |
1243 bool reguard_stack(address cur_sp); | |
1244 // Similar to above but see if current stackpoint is out of the guard area | |
1245 // and reguard if possible. | |
1246 bool reguard_stack(void); | |
1247 | |
1248 // Misc. accessors/mutators | |
1249 void set_do_not_unlock(void) { _do_not_unlock_if_synchronized = true; } | |
1250 void clr_do_not_unlock(void) { _do_not_unlock_if_synchronized = false; } | |
1251 bool do_not_unlock(void) { return _do_not_unlock_if_synchronized; } | |
1252 | |
1253 #ifndef PRODUCT | |
1254 void record_jump(address target, address instr, const char* file, int line); | |
1255 #endif /* PRODUCT */ | |
1256 | |
1257 // For assembly stub generation | |
1258 static ByteSize threadObj_offset() { return byte_offset_of(JavaThread, _threadObj ); } | |
1259 #ifndef PRODUCT | |
1260 static ByteSize jmp_ring_index_offset() { return byte_offset_of(JavaThread, _jmp_ring_index ); } | |
1261 static ByteSize jmp_ring_offset() { return byte_offset_of(JavaThread, _jmp_ring ); } | |
1262 #endif /* PRODUCT */ | |
1263 static ByteSize jni_environment_offset() { return byte_offset_of(JavaThread, _jni_environment ); } | |
1264 static ByteSize last_Java_sp_offset() { | |
1265 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_sp_offset(); | |
1266 } | |
1267 static ByteSize last_Java_pc_offset() { | |
1268 return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_pc_offset(); | |
1269 } | |
1270 static ByteSize frame_anchor_offset() { | |
1271 return byte_offset_of(JavaThread, _anchor); | |
1272 } | |
1273 static ByteSize callee_target_offset() { return byte_offset_of(JavaThread, _callee_target ); } | |
1274 static ByteSize vm_result_offset() { return byte_offset_of(JavaThread, _vm_result ); } | |
1275 static ByteSize vm_result_2_offset() { return byte_offset_of(JavaThread, _vm_result_2 ); } | |
1276 static ByteSize thread_state_offset() { return byte_offset_of(JavaThread, _thread_state ); } | |
1277 static ByteSize saved_exception_pc_offset() { return byte_offset_of(JavaThread, _saved_exception_pc ); } | |
1278 static ByteSize osthread_offset() { return byte_offset_of(JavaThread, _osthread ); } | |
1279 static ByteSize exception_oop_offset() { return byte_offset_of(JavaThread, _exception_oop ); } | |
1280 static ByteSize exception_pc_offset() { return byte_offset_of(JavaThread, _exception_pc ); } | |
1281 static ByteSize exception_handler_pc_offset() { return byte_offset_of(JavaThread, _exception_handler_pc); } | |
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1282 static ByteSize is_method_handle_return_offset() { return byte_offset_of(JavaThread, _is_method_handle_return); } |
0 | 1283 static ByteSize stack_guard_state_offset() { return byte_offset_of(JavaThread, _stack_guard_state ); } |
1284 static ByteSize suspend_flags_offset() { return byte_offset_of(JavaThread, _suspend_flags ); } | |
1285 | |
1286 static ByteSize do_not_unlock_if_synchronized_offset() { return byte_offset_of(JavaThread, _do_not_unlock_if_synchronized); } | |
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1287 static ByteSize should_post_on_exceptions_flag_offset() { |
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1288 return byte_offset_of(JavaThread, _should_post_on_exceptions_flag); |
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1289 } |
0 | 1290 |
342 | 1291 #ifndef SERIALGC |
1292 static ByteSize satb_mark_queue_offset() { return byte_offset_of(JavaThread, _satb_mark_queue); } | |
1293 static ByteSize dirty_card_queue_offset() { return byte_offset_of(JavaThread, _dirty_card_queue); } | |
1294 #endif // !SERIALGC | |
1295 | |
0 | 1296 // Returns the jni environment for this thread |
1297 JNIEnv* jni_environment() { return &_jni_environment; } | |
1298 | |
1299 static JavaThread* thread_from_jni_environment(JNIEnv* env) { | |
1300 JavaThread *thread_from_jni_env = (JavaThread*)((intptr_t)env - in_bytes(jni_environment_offset())); | |
1301 // Only return NULL if thread is off the thread list; starting to | |
1302 // exit should not return NULL. | |
1303 if (thread_from_jni_env->is_terminated()) { | |
1304 thread_from_jni_env->block_if_vm_exited(); | |
1305 return NULL; | |
1306 } else { | |
1307 return thread_from_jni_env; | |
1308 } | |
1309 } | |
1310 | |
1311 // JNI critical regions. These can nest. | |
1312 bool in_critical() { return _jni_active_critical > 0; } | |
1313 void enter_critical() { assert(Thread::current() == this, | |
1314 "this must be current thread"); | |
1315 _jni_active_critical++; } | |
1316 void exit_critical() { assert(Thread::current() == this, | |
1317 "this must be current thread"); | |
1318 _jni_active_critical--; | |
1319 assert(_jni_active_critical >= 0, | |
1320 "JNI critical nesting problem?"); } | |
1321 | |
1322 // For deadlock detection | |
1323 int depth_first_number() { return _depth_first_number; } | |
1324 void set_depth_first_number(int dfn) { _depth_first_number = dfn; } | |
1325 | |
1326 private: | |
1327 void set_monitor_chunks(MonitorChunk* monitor_chunks) { _monitor_chunks = monitor_chunks; } | |
1328 | |
1329 public: | |
1330 MonitorChunk* monitor_chunks() const { return _monitor_chunks; } | |
1331 void add_monitor_chunk(MonitorChunk* chunk); | |
1332 void remove_monitor_chunk(MonitorChunk* chunk); | |
1333 bool in_deopt_handler() const { return _in_deopt_handler > 0; } | |
1334 void inc_in_deopt_handler() { _in_deopt_handler++; } | |
1335 void dec_in_deopt_handler() { | |
1336 assert(_in_deopt_handler > 0, "mismatched deopt nesting"); | |
1337 if (_in_deopt_handler > 0) { // robustness | |
1338 _in_deopt_handler--; | |
1339 } | |
1340 } | |
1341 | |
1342 private: | |
1343 void set_entry_point(ThreadFunction entry_point) { _entry_point = entry_point; } | |
1344 | |
1345 public: | |
1346 | |
1347 // Frame iteration; calls the function f for all frames on the stack | |
1348 void frames_do(void f(frame*, const RegisterMap*)); | |
1349 | |
1350 // Memory operations | |
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1351 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1352 |
1353 // Sweeper operations | |
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1354 void nmethods_do(CodeBlobClosure* cf); |
0 | 1355 |
1356 // Memory management operations | |
1357 void gc_epilogue(); | |
1358 void gc_prologue(); | |
1359 | |
1360 // Misc. operations | |
1361 char* name() const { return (char*)get_thread_name(); } | |
1362 void print_on(outputStream* st) const; | |
1363 void print() const { print_on(tty); } | |
1364 void print_value(); | |
1365 void print_thread_state_on(outputStream* ) const PRODUCT_RETURN; | |
1366 void print_thread_state() const PRODUCT_RETURN; | |
1367 void print_on_error(outputStream* st, char* buf, int buflen) const; | |
1368 void verify(); | |
1369 const char* get_thread_name() const; | |
1370 private: | |
1371 // factor out low-level mechanics for use in both normal and error cases | |
1372 const char* get_thread_name_string(char* buf = NULL, int buflen = 0) const; | |
1373 public: | |
1374 const char* get_threadgroup_name() const; | |
1375 const char* get_parent_name() const; | |
1376 | |
1377 // Accessing frames | |
1378 frame last_frame() { | |
1379 _anchor.make_walkable(this); | |
1380 return pd_last_frame(); | |
1381 } | |
1382 javaVFrame* last_java_vframe(RegisterMap* reg_map); | |
1383 | |
1384 // Returns method at 'depth' java or native frames down the stack | |
1385 // Used for security checks | |
1386 klassOop security_get_caller_class(int depth); | |
1387 | |
1388 // Print stack trace in external format | |
1389 void print_stack_on(outputStream* st); | |
1390 void print_stack() { print_stack_on(tty); } | |
1391 | |
1392 // Print stack traces in various internal formats | |
1393 void trace_stack() PRODUCT_RETURN; | |
1394 void trace_stack_from(vframe* start_vf) PRODUCT_RETURN; | |
1395 void trace_frames() PRODUCT_RETURN; | |
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1396 void trace_oops() PRODUCT_RETURN; |
0 | 1397 |
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1398 // Print an annotated view of the stack frames |
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1399 void print_frame_layout(int depth = 0, bool validate_only = false) NOT_DEBUG_RETURN; |
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1400 void validate_frame_layout() { |
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1401 print_frame_layout(0, true); |
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1402 } |
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1403 |
0 | 1404 // Returns the number of stack frames on the stack |
1405 int depth() const; | |
1406 | |
1407 // Function for testing deoptimization | |
1408 void deoptimize(); | |
1409 void make_zombies(); | |
1410 | |
1411 void deoptimized_wrt_marked_nmethods(); | |
1412 | |
1413 // Profiling operation (see fprofile.cpp) | |
1414 public: | |
1415 bool profile_last_Java_frame(frame* fr); | |
1416 | |
1417 private: | |
1418 ThreadProfiler* _thread_profiler; | |
1419 private: | |
1420 friend class FlatProfiler; // uses both [gs]et_thread_profiler. | |
1421 friend class FlatProfilerTask; // uses get_thread_profiler. | |
1422 friend class ThreadProfilerMark; // uses get_thread_profiler. | |
1423 ThreadProfiler* get_thread_profiler() { return _thread_profiler; } | |
1424 ThreadProfiler* set_thread_profiler(ThreadProfiler* tp) { | |
1425 ThreadProfiler* result = _thread_profiler; | |
1426 _thread_profiler = tp; | |
1427 return result; | |
1428 } | |
1429 | |
1430 // Static operations | |
1431 public: | |
1432 // Returns the running thread as a JavaThread | |
1433 static inline JavaThread* current(); | |
1434 | |
1435 // Returns the active Java thread. Do not use this if you know you are calling | |
1436 // from a JavaThread, as it's slower than JavaThread::current. If called from | |
1437 // the VMThread, it also returns the JavaThread that instigated the VMThread's | |
1438 // operation. You may not want that either. | |
1439 static JavaThread* active(); | |
1440 | |
1441 inline CompilerThread* as_CompilerThread(); | |
1442 | |
1443 public: | |
1444 virtual void run(); | |
1445 void thread_main_inner(); | |
1446 | |
1447 private: | |
1448 // PRIVILEGED STACK | |
1449 PrivilegedElement* _privileged_stack_top; | |
1450 GrowableArray<oop>* _array_for_gc; | |
1451 public: | |
1452 | |
1453 // Returns the privileged_stack information. | |
1454 PrivilegedElement* privileged_stack_top() const { return _privileged_stack_top; } | |
1455 void set_privileged_stack_top(PrivilegedElement *e) { _privileged_stack_top = e; } | |
1456 void register_array_for_gc(GrowableArray<oop>* array) { _array_for_gc = array; } | |
1457 | |
1458 public: | |
1459 // Thread local information maintained by JVMTI. | |
1460 void set_jvmti_thread_state(JvmtiThreadState *value) { _jvmti_thread_state = value; } | |
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1461 // A JvmtiThreadState is lazily allocated. This jvmti_thread_state() |
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1462 // getter is used to get this JavaThread's JvmtiThreadState if it has |
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1463 // one which means NULL can be returned. JvmtiThreadState::state_for() |
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1464 // is used to get the specified JavaThread's JvmtiThreadState if it has |
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1465 // one or it allocates a new JvmtiThreadState for the JavaThread and |
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1466 // returns it. JvmtiThreadState::state_for() will return NULL only if |
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1467 // the specified JavaThread is exiting. |
0 | 1468 JvmtiThreadState *jvmti_thread_state() const { return _jvmti_thread_state; } |
1469 static ByteSize jvmti_thread_state_offset() { return byte_offset_of(JavaThread, _jvmti_thread_state); } | |
1470 void set_jvmti_get_loaded_classes_closure(JvmtiGetLoadedClassesClosure* value) { _jvmti_get_loaded_classes_closure = value; } | |
1471 JvmtiGetLoadedClassesClosure* get_jvmti_get_loaded_classes_closure() const { return _jvmti_get_loaded_classes_closure; } | |
1472 | |
1473 // JVMTI PopFrame support | |
1474 // Setting and clearing popframe_condition | |
1475 // All of these enumerated values are bits. popframe_pending | |
1476 // indicates that a PopFrame() has been requested and not yet been | |
1477 // completed. popframe_processing indicates that that PopFrame() is in | |
1478 // the process of being completed. popframe_force_deopt_reexecution_bit | |
1479 // indicates that special handling is required when returning to a | |
1480 // deoptimized caller. | |
1481 enum PopCondition { | |
1482 popframe_inactive = 0x00, | |
1483 popframe_pending_bit = 0x01, | |
1484 popframe_processing_bit = 0x02, | |
1485 popframe_force_deopt_reexecution_bit = 0x04 | |
1486 }; | |
1487 PopCondition popframe_condition() { return (PopCondition) _popframe_condition; } | |
1488 void set_popframe_condition(PopCondition c) { _popframe_condition = c; } | |
1489 void set_popframe_condition_bit(PopCondition c) { _popframe_condition |= c; } | |
1490 void clear_popframe_condition() { _popframe_condition = popframe_inactive; } | |
1491 static ByteSize popframe_condition_offset() { return byte_offset_of(JavaThread, _popframe_condition); } | |
1492 bool has_pending_popframe() { return (popframe_condition() & popframe_pending_bit) != 0; } | |
1493 bool popframe_forcing_deopt_reexecution() { return (popframe_condition() & popframe_force_deopt_reexecution_bit) != 0; } | |
1494 void clear_popframe_forcing_deopt_reexecution() { _popframe_condition &= ~popframe_force_deopt_reexecution_bit; } | |
1495 #ifdef CC_INTERP | |
1496 bool pop_frame_pending(void) { return ((_popframe_condition & popframe_pending_bit) != 0); } | |
1497 void clr_pop_frame_pending(void) { _popframe_condition = popframe_inactive; } | |
1498 bool pop_frame_in_process(void) { return ((_popframe_condition & popframe_processing_bit) != 0); } | |
1499 void set_pop_frame_in_process(void) { _popframe_condition |= popframe_processing_bit; } | |
1500 void clr_pop_frame_in_process(void) { _popframe_condition &= ~popframe_processing_bit; } | |
1501 #endif | |
1502 | |
1503 private: | |
1504 // Saved incoming arguments to popped frame. | |
1505 // Used only when popped interpreted frame returns to deoptimized frame. | |
1506 void* _popframe_preserved_args; | |
1507 int _popframe_preserved_args_size; | |
1508 | |
1509 public: | |
1510 void popframe_preserve_args(ByteSize size_in_bytes, void* start); | |
1511 void* popframe_preserved_args(); | |
1512 ByteSize popframe_preserved_args_size(); | |
1513 WordSize popframe_preserved_args_size_in_words(); | |
1514 void popframe_free_preserved_args(); | |
1515 | |
1516 | |
1517 private: | |
1518 JvmtiThreadState *_jvmti_thread_state; | |
1519 JvmtiGetLoadedClassesClosure* _jvmti_get_loaded_classes_closure; | |
1520 | |
1521 // Used by the interpreter in fullspeed mode for frame pop, method | |
1522 // entry, method exit and single stepping support. This field is | |
1523 // only set to non-zero by the VM_EnterInterpOnlyMode VM operation. | |
1524 // It can be set to zero asynchronously (i.e., without a VM operation | |
1525 // or a lock) so we have to be very careful. | |
1526 int _interp_only_mode; | |
1527 | |
1528 public: | |
1529 // used by the interpreter for fullspeed debugging support (see above) | |
1530 static ByteSize interp_only_mode_offset() { return byte_offset_of(JavaThread, _interp_only_mode); } | |
1531 bool is_interp_only_mode() { return (_interp_only_mode != 0); } | |
1532 int get_interp_only_mode() { return _interp_only_mode; } | |
1533 void increment_interp_only_mode() { ++_interp_only_mode; } | |
1534 void decrement_interp_only_mode() { --_interp_only_mode; } | |
1535 | |
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1536 // support for cached flag that indicates whether exceptions need to be posted for this thread |
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1537 // if this is false, we can avoid deoptimizing when events are thrown |
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1538 // this gets set to reflect whether jvmtiExport::post_exception_throw would actually do anything |
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1539 private: |
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1540 int _should_post_on_exceptions_flag; |
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1541 |
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1542 public: |
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1543 int should_post_on_exceptions_flag() { return _should_post_on_exceptions_flag; } |
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1544 void set_should_post_on_exceptions_flag(int val) { _should_post_on_exceptions_flag = val; } |
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1545 |
0 | 1546 private: |
1547 ThreadStatistics *_thread_stat; | |
1548 | |
1549 public: | |
1550 ThreadStatistics* get_thread_stat() const { return _thread_stat; } | |
1551 | |
1552 // Return a blocker object for which this thread is blocked parking. | |
1553 oop current_park_blocker(); | |
1554 | |
1555 private: | |
1556 static size_t _stack_size_at_create; | |
1557 | |
1558 public: | |
1559 static inline size_t stack_size_at_create(void) { | |
1560 return _stack_size_at_create; | |
1561 } | |
1562 static inline void set_stack_size_at_create(size_t value) { | |
1563 _stack_size_at_create = value; | |
1564 } | |
1565 | |
342 | 1566 #ifndef SERIALGC |
1567 // SATB marking queue support | |
1568 ObjPtrQueue& satb_mark_queue() { return _satb_mark_queue; } | |
1569 static SATBMarkQueueSet& satb_mark_queue_set() { | |
1570 return _satb_mark_queue_set; | |
1571 } | |
1572 | |
1573 // Dirty card queue support | |
1574 DirtyCardQueue& dirty_card_queue() { return _dirty_card_queue; } | |
1575 static DirtyCardQueueSet& dirty_card_queue_set() { | |
1576 return _dirty_card_queue_set; | |
1577 } | |
1578 #endif // !SERIALGC | |
1579 | |
1842
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1580 // This method initializes the SATB and dirty card queues before a |
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1581 // JavaThread is added to the Java thread list. Right now, we don't |
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1582 // have to do anything to the dirty card queue (it should have been |
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1583 // activated when the thread was created), but we have to activate |
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1584 // the SATB queue if the thread is created while a marking cycle is |
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1585 // in progress. The activation / de-activation of the SATB queues at |
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1586 // the beginning / end of a marking cycle is done during safepoints |
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1587 // so we have to make sure this method is called outside one to be |
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1588 // able to safely read the active field of the SATB queue set. Right |
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1589 // now, it is called just before the thread is added to the Java |
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1590 // thread list in the Threads::add() method. That method is holding |
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1591 // the Threads_lock which ensures we are outside a safepoint. We |
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1592 // cannot do the obvious and set the active field of the SATB queue |
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1593 // when the thread is created given that, in some cases, safepoints |
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1594 // might happen between the JavaThread constructor being called and the |
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1595 // thread being added to the Java thread list (an example of this is |
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1596 // when the structure for the DestroyJavaVM thread is created). |
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1597 #ifndef SERIALGC |
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1598 void initialize_queues(); |
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1599 #else // !SERIALGC |
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1600 void initialize_queues() { } |
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1601 #endif // !SERIALGC |
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1602 |
0 | 1603 // Machine dependent stuff |
1972 | 1604 #ifdef TARGET_OS_ARCH_linux_x86 |
1605 # include "thread_linux_x86.hpp" | |
1606 #endif | |
1607 #ifdef TARGET_OS_ARCH_linux_sparc | |
1608 # include "thread_linux_sparc.hpp" | |
1609 #endif | |
1610 #ifdef TARGET_OS_ARCH_linux_zero | |
1611 # include "thread_linux_zero.hpp" | |
1612 #endif | |
1613 #ifdef TARGET_OS_ARCH_solaris_x86 | |
1614 # include "thread_solaris_x86.hpp" | |
1615 #endif | |
1616 #ifdef TARGET_OS_ARCH_solaris_sparc | |
1617 # include "thread_solaris_sparc.hpp" | |
1618 #endif | |
1619 #ifdef TARGET_OS_ARCH_windows_x86 | |
1620 # include "thread_windows_x86.hpp" | |
1621 #endif | |
2192
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1622 #ifdef TARGET_OS_ARCH_linux_arm |
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1623 # include "thread_linux_arm.hpp" |
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1624 #endif |
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1625 #ifdef TARGET_OS_ARCH_linux_ppc |
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1626 # include "thread_linux_ppc.hpp" |
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1627 #endif |
3960 | 1628 #ifdef TARGET_OS_ARCH_bsd_x86 |
1629 # include "thread_bsd_x86.hpp" | |
1630 #endif | |
1631 #ifdef TARGET_OS_ARCH_bsd_zero | |
1632 # include "thread_bsd_zero.hpp" | |
1633 #endif | |
1972 | 1634 |
0 | 1635 |
1636 public: | |
1637 void set_blocked_on_compilation(bool value) { | |
1638 _blocked_on_compilation = value; | |
1639 } | |
1640 | |
1641 bool blocked_on_compilation() { | |
1642 return _blocked_on_compilation; | |
1643 } | |
1644 protected: | |
1645 bool _blocked_on_compilation; | |
1646 | |
1647 | |
1648 // JSR166 per-thread parker | |
1649 private: | |
1650 Parker* _parker; | |
1651 public: | |
1652 Parker* parker() { return _parker; } | |
1653 | |
1654 // Biased locking support | |
1655 private: | |
1656 GrowableArray<MonitorInfo*>* _cached_monitor_info; | |
1657 public: | |
1658 GrowableArray<MonitorInfo*>* cached_monitor_info() { return _cached_monitor_info; } | |
1659 void set_cached_monitor_info(GrowableArray<MonitorInfo*>* info) { _cached_monitor_info = info; } | |
1660 | |
1661 // clearing/querying jni attach status | |
4006 | 1662 bool is_attaching_via_jni() const { return _jni_attach_state == _attaching_via_jni; } |
1663 bool has_attached_via_jni() const { return is_attaching_via_jni() || _jni_attach_state == _attached_via_jni; } | |
1664 void set_done_attaching_via_jni() { _jni_attach_state = _attached_via_jni; OrderAccess::fence(); } | |
342 | 1665 private: |
1666 // This field is used to determine if a thread has claimed | |
1667 // a par_id: it is -1 if the thread has not claimed a par_id; | |
1668 // otherwise its value is the par_id that has been claimed. | |
1669 int _claimed_par_id; | |
1670 public: | |
1671 int get_claimed_par_id() { return _claimed_par_id; } | |
1672 void set_claimed_par_id(int id) { _claimed_par_id = id;} | |
0 | 1673 }; |
1674 | |
1675 // Inline implementation of JavaThread::current | |
1676 inline JavaThread* JavaThread::current() { | |
1677 Thread* thread = ThreadLocalStorage::thread(); | |
1678 assert(thread != NULL && thread->is_Java_thread(), "just checking"); | |
1679 return (JavaThread*)thread; | |
1680 } | |
1681 | |
1682 inline CompilerThread* JavaThread::as_CompilerThread() { | |
1683 assert(is_Compiler_thread(), "just checking"); | |
1684 return (CompilerThread*)this; | |
1685 } | |
1686 | |
1687 inline bool JavaThread::stack_yellow_zone_disabled() { | |
1688 return _stack_guard_state == stack_guard_yellow_disabled; | |
1689 } | |
1690 | |
1691 inline bool JavaThread::stack_yellow_zone_enabled() { | |
1692 #ifdef ASSERT | |
1693 if (os::uses_stack_guard_pages()) { | |
1694 assert(_stack_guard_state != stack_guard_unused, "guard pages must be in use"); | |
1695 } | |
1696 #endif | |
1697 return _stack_guard_state == stack_guard_enabled; | |
1698 } | |
1699 | |
1700 inline size_t JavaThread::stack_available(address cur_sp) { | |
1701 // This code assumes java stacks grow down | |
1702 address low_addr; // Limit on the address for deepest stack depth | |
1703 if ( _stack_guard_state == stack_guard_unused) { | |
1704 low_addr = stack_base() - stack_size(); | |
1705 } else { | |
1706 low_addr = stack_yellow_zone_base(); | |
1707 } | |
1708 return cur_sp > low_addr ? cur_sp - low_addr : 0; | |
1709 } | |
1710 | |
1711 // A thread used for Compilation. | |
1712 class CompilerThread : public JavaThread { | |
1713 friend class VMStructs; | |
1714 private: | |
1715 CompilerCounters* _counters; | |
1716 | |
1717 ciEnv* _env; | |
1718 CompileLog* _log; | |
1719 CompileTask* _task; | |
1720 CompileQueue* _queue; | |
1584 | 1721 BufferBlob* _buffer_blob; |
0 | 1722 |
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1723 nmethod* _scanned_nmethod; // nmethod being scanned by the sweeper |
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1724 |
0 | 1725 public: |
1726 | |
1727 static CompilerThread* current(); | |
1728 | |
1729 CompilerThread(CompileQueue* queue, CompilerCounters* counters); | |
1730 | |
1731 bool is_Compiler_thread() const { return true; } | |
1732 // Hide this compiler thread from external view. | |
1733 bool is_hidden_from_external_view() const { return true; } | |
1734 | |
1735 CompileQueue* queue() { return _queue; } | |
1736 CompilerCounters* counters() { return _counters; } | |
1737 | |
1738 // Get/set the thread's compilation environment. | |
1739 ciEnv* env() { return _env; } | |
1740 void set_env(ciEnv* env) { _env = env; } | |
1741 | |
1584 | 1742 BufferBlob* get_buffer_blob() { return _buffer_blob; } |
1743 void set_buffer_blob(BufferBlob* b) { _buffer_blob = b; }; | |
1744 | |
0 | 1745 // Get/set the thread's logging information |
1746 CompileLog* log() { return _log; } | |
1747 void init_log(CompileLog* log) { | |
1748 // Set once, for good. | |
1749 assert(_log == NULL, "set only once"); | |
1750 _log = log; | |
1751 } | |
1752 | |
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1753 // GC support |
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1754 // Apply "f->do_oop" to all root oops in "this". |
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1755 // Apply "cf->do_code_blob" (if !NULL) to all code blobs active in frames |
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1756 void oops_do(OopClosure* f, CodeBlobClosure* cf); |
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1757 |
0 | 1758 #ifndef PRODUCT |
1759 private: | |
1760 IdealGraphPrinter *_ideal_graph_printer; | |
1761 public: | |
1762 IdealGraphPrinter *ideal_graph_printer() { return _ideal_graph_printer; } | |
1763 void set_ideal_graph_printer(IdealGraphPrinter *n) { _ideal_graph_printer = n; } | |
1764 #endif | |
1765 | |
1766 // Get/set the thread's current task | |
1767 CompileTask* task() { return _task; } | |
1768 void set_task(CompileTask* task) { _task = task; } | |
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1769 |
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1770 // Track the nmethod currently being scanned by the sweeper |
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1771 void set_scanned_nmethod(nmethod* nm) { |
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1772 assert(_scanned_nmethod == NULL || nm == NULL, "should reset to NULL before writing a new value"); |
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1773 _scanned_nmethod = nm; |
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1774 } |
0 | 1775 }; |
1776 | |
1777 inline CompilerThread* CompilerThread::current() { | |
1778 return JavaThread::current()->as_CompilerThread(); | |
1779 } | |
1780 | |
1781 | |
1782 // The active thread queue. It also keeps track of the current used | |
1783 // thread priorities. | |
1784 class Threads: AllStatic { | |
1785 friend class VMStructs; | |
1786 private: | |
1787 static JavaThread* _thread_list; | |
1788 static int _number_of_threads; | |
1789 static int _number_of_non_daemon_threads; | |
1790 static int _return_code; | |
1791 | |
1792 public: | |
1793 // Thread management | |
1794 // force_daemon is a concession to JNI, where we may need to add a | |
1795 // thread to the thread list before allocating its thread object | |
1796 static void add(JavaThread* p, bool force_daemon = false); | |
1797 static void remove(JavaThread* p); | |
1798 static bool includes(JavaThread* p); | |
1799 static JavaThread* first() { return _thread_list; } | |
1800 static void threads_do(ThreadClosure* tc); | |
1801 | |
1802 // Initializes the vm and creates the vm thread | |
1803 static jint create_vm(JavaVMInitArgs* args, bool* canTryAgain); | |
1804 static void convert_vm_init_libraries_to_agents(); | |
1805 static void create_vm_init_libraries(); | |
1806 static void create_vm_init_agents(); | |
1807 static void shutdown_vm_agents(); | |
1808 static bool destroy_vm(); | |
1809 // Supported VM versions via JNI | |
1810 // Includes JNI_VERSION_1_1 | |
1811 static jboolean is_supported_jni_version_including_1_1(jint version); | |
1812 // Does not include JNI_VERSION_1_1 | |
1813 static jboolean is_supported_jni_version(jint version); | |
1814 | |
1815 // Garbage collection | |
1816 static void follow_other_roots(void f(oop*)); | |
1817 | |
1818 // Apply "f->do_oop" to all root oops in all threads. | |
1819 // This version may only be called by sequential code. | |
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1820 static void oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1821 // This version may be called by sequential or parallel code. |
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1822 static void possibly_parallel_oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1823 // This creates a list of GCTasks, one per thread. |
1824 static void create_thread_roots_tasks(GCTaskQueue* q); | |
1825 // This creates a list of GCTasks, one per thread, for marking objects. | |
1826 static void create_thread_roots_marking_tasks(GCTaskQueue* q); | |
1827 | |
1828 // Apply "f->do_oop" to roots in all threads that | |
1829 // are part of compiled frames | |
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1830 static void compiled_frame_oops_do(OopClosure* f, CodeBlobClosure* cf); |
0 | 1831 |
1832 static void convert_hcode_pointers(); | |
1833 static void restore_hcode_pointers(); | |
1834 | |
1835 // Sweeper | |
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1836 static void nmethods_do(CodeBlobClosure* cf); |
0 | 1837 |
1838 static void gc_epilogue(); | |
1839 static void gc_prologue(); | |
1840 | |
1841 // Verification | |
1842 static void verify(); | |
1843 static void print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks); | |
1844 static void print(bool print_stacks, bool internal_format) { | |
1845 // this function is only used by debug.cpp | |
1846 print_on(tty, print_stacks, internal_format, false /* no concurrent lock printed */); | |
1847 } | |
1848 static void print_on_error(outputStream* st, Thread* current, char* buf, int buflen); | |
1849 | |
1850 // Get Java threads that are waiting to enter a monitor. If doLock | |
1851 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1852 // VM needs to be at a safepoint. | |
1853 static GrowableArray<JavaThread*>* get_pending_threads(int count, | |
1854 address monitor, bool doLock); | |
1855 | |
1856 // Get owning Java thread from the monitor's owner field. If doLock | |
1857 // is true, then Threads_lock is grabbed as needed. Otherwise, the | |
1858 // VM needs to be at a safepoint. | |
1859 static JavaThread *owning_thread_from_monitor_owner(address owner, | |
1860 bool doLock); | |
1861 | |
1862 // Number of threads on the active threads list | |
1863 static int number_of_threads() { return _number_of_threads; } | |
1864 // Number of non-daemon threads on the active threads list | |
1865 static int number_of_non_daemon_threads() { return _number_of_non_daemon_threads; } | |
1866 | |
1867 // Deoptimizes all frames tied to marked nmethods | |
1868 static void deoptimized_wrt_marked_nmethods(); | |
1869 | |
1870 }; | |
1871 | |
1872 | |
1873 // Thread iterator | |
1874 class ThreadClosure: public StackObj { | |
1875 public: | |
1876 virtual void do_thread(Thread* thread) = 0; | |
1877 }; | |
1878 | |
1879 class SignalHandlerMark: public StackObj { | |
1880 private: | |
1881 Thread* _thread; | |
1882 public: | |
1883 SignalHandlerMark(Thread* t) { | |
1884 _thread = t; | |
1885 if (_thread) _thread->enter_signal_handler(); | |
1886 } | |
1887 ~SignalHandlerMark() { | |
1888 if (_thread) _thread->leave_signal_handler(); | |
1889 _thread = NULL; | |
1890 } | |
1891 }; | |
1892 | |
1972 | 1893 |
1894 #endif // SHARE_VM_RUNTIME_THREAD_HPP |