1 /*
2 * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "cds/cdsConfig.hpp"
27 #include "cds/classPreloader.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "classfile/vmClasses.hpp"
31 #include "classfile/vmSymbols.hpp"
32 #include "code/codeCache.hpp"
33 #include "code/codeHeapState.hpp"
34 #include "code/dependencyContext.hpp"
35 #include "code/SCCache.hpp"
36 #include "compiler/compilationLog.hpp"
37 #include "compiler/compilationMemoryStatistic.hpp"
38 #include "compiler/compilationPolicy.hpp"
39 #include "compiler/compileBroker.hpp"
40 #include "compiler/compilerDefinitions.inline.hpp"
41 #include "compiler/compileLog.hpp"
42 #include "compiler/compilerEvent.hpp"
43 #include "compiler/compilerOracle.hpp"
44 #include "compiler/directivesParser.hpp"
45 #include "gc/shared/memAllocator.hpp"
46 #include "interpreter/linkResolver.hpp"
47 #include "jvm.h"
48 #include "jfr/jfrEvents.hpp"
49 #include "logging/log.hpp"
50 #include "logging/logStream.hpp"
51 #include "memory/allocation.inline.hpp"
52 #include "memory/resourceArea.hpp"
53 #include "memory/universe.hpp"
54 #include "oops/methodData.hpp"
55 #include "oops/method.inline.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "prims/jvmtiExport.hpp"
58 #include "prims/nativeLookup.hpp"
59 #include "prims/whitebox.hpp"
60 #include "runtime/atomic.hpp"
61 #include "runtime/escapeBarrier.hpp"
62 #include "runtime/globals_extension.hpp"
63 #include "runtime/handles.inline.hpp"
64 #include "runtime/init.hpp"
65 #include "runtime/interfaceSupport.inline.hpp"
66 #include "runtime/java.hpp"
67 #include "runtime/javaCalls.hpp"
68 #include "runtime/jniHandles.inline.hpp"
69 #include "runtime/os.hpp"
70 #include "runtime/perfData.hpp"
71 #include "runtime/safepointVerifiers.hpp"
72 #include "runtime/sharedRuntime.hpp"
73 #include "runtime/threads.hpp"
74 #include "runtime/threadSMR.inline.hpp"
75 #include "runtime/timerTrace.hpp"
76 #include "runtime/vframe.inline.hpp"
77 #include "services/management.hpp"
78 #include "utilities/debug.hpp"
79 #include "utilities/dtrace.hpp"
80 #include "utilities/events.hpp"
81 #include "utilities/formatBuffer.hpp"
82 #include "utilities/macros.hpp"
83 #include "utilities/nonblockingQueue.inline.hpp"
84 #ifdef COMPILER1
85 #include "c1/c1_Compiler.hpp"
86 #endif
87 #ifdef COMPILER2
88 #include "opto/c2compiler.hpp"
89 #endif
90 #if INCLUDE_JVMCI
91 #include "jvmci/jvmciEnv.hpp"
92 #include "jvmci/jvmciRuntime.hpp"
93 #endif
94
95 #ifdef DTRACE_ENABLED
96
97 // Only bother with this argument setup if dtrace is available
98
99 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
100 { \
101 Symbol* klass_name = (method)->klass_name(); \
102 Symbol* name = (method)->name(); \
103 Symbol* signature = (method)->signature(); \
104 HOTSPOT_METHOD_COMPILE_BEGIN( \
105 (char *) comp_name, strlen(comp_name), \
106 (char *) klass_name->bytes(), klass_name->utf8_length(), \
107 (char *) name->bytes(), name->utf8_length(), \
108 (char *) signature->bytes(), signature->utf8_length()); \
109 }
110
111 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
112 { \
113 Symbol* klass_name = (method)->klass_name(); \
114 Symbol* name = (method)->name(); \
115 Symbol* signature = (method)->signature(); \
116 HOTSPOT_METHOD_COMPILE_END( \
117 (char *) comp_name, strlen(comp_name), \
118 (char *) klass_name->bytes(), klass_name->utf8_length(), \
119 (char *) name->bytes(), name->utf8_length(), \
120 (char *) signature->bytes(), signature->utf8_length(), (success)); \
121 }
122
123 #else // ndef DTRACE_ENABLED
124
125 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
126 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
127
128 #endif // ndef DTRACE_ENABLED
129
130 bool CompileBroker::_initialized = false;
131 bool CompileBroker::_replay_initialized = false;
132 volatile bool CompileBroker::_should_block = false;
133 volatile int CompileBroker::_print_compilation_warning = 0;
134 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
135
136 // The installed compiler(s)
137 AbstractCompiler* CompileBroker::_compilers[3];
138
139 // The maximum numbers of compiler threads to be determined during startup.
140 int CompileBroker::_c1_count = 0;
141 int CompileBroker::_c2_count = 0;
142 int CompileBroker::_c3_count = 0;
143 int CompileBroker::_sc_count = 0;
144
145 // An array of compiler names as Java String objects
146 jobject* CompileBroker::_compiler1_objects = nullptr;
147 jobject* CompileBroker::_compiler2_objects = nullptr;
148 jobject* CompileBroker::_compiler3_objects = nullptr;
149 jobject* CompileBroker::_sc_objects = nullptr;
150
151 CompileLog** CompileBroker::_compiler1_logs = nullptr;
152 CompileLog** CompileBroker::_compiler2_logs = nullptr;
153 CompileLog** CompileBroker::_compiler3_logs = nullptr;
154 CompileLog** CompileBroker::_sc_logs = nullptr;
155
156 // These counters are used to assign an unique ID to each compilation.
157 volatile jint CompileBroker::_compilation_id = 0;
158 volatile jint CompileBroker::_osr_compilation_id = 0;
159 volatile jint CompileBroker::_native_compilation_id = 0;
160
161 // Performance counters
162 PerfCounter* CompileBroker::_perf_total_compilation = nullptr;
163 PerfCounter* CompileBroker::_perf_osr_compilation = nullptr;
164 PerfCounter* CompileBroker::_perf_standard_compilation = nullptr;
165
166 PerfCounter* CompileBroker::_perf_total_bailout_count = nullptr;
167 PerfCounter* CompileBroker::_perf_total_invalidated_count = nullptr;
168 PerfCounter* CompileBroker::_perf_total_compile_count = nullptr;
169 PerfCounter* CompileBroker::_perf_total_osr_compile_count = nullptr;
170 PerfCounter* CompileBroker::_perf_total_standard_compile_count = nullptr;
171
172 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = nullptr;
173 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = nullptr;
174 PerfCounter* CompileBroker::_perf_sum_nmethod_size = nullptr;
175 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = nullptr;
176
177 PerfStringVariable* CompileBroker::_perf_last_method = nullptr;
178 PerfStringVariable* CompileBroker::_perf_last_failed_method = nullptr;
179 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = nullptr;
180 PerfVariable* CompileBroker::_perf_last_compile_type = nullptr;
181 PerfVariable* CompileBroker::_perf_last_compile_size = nullptr;
182 PerfVariable* CompileBroker::_perf_last_failed_type = nullptr;
183 PerfVariable* CompileBroker::_perf_last_invalidated_type = nullptr;
184
185 // Timers and counters for generating statistics
186 elapsedTimer CompileBroker::_t_total_compilation;
187 elapsedTimer CompileBroker::_t_osr_compilation;
188 elapsedTimer CompileBroker::_t_standard_compilation;
189 elapsedTimer CompileBroker::_t_invalidated_compilation;
190 elapsedTimer CompileBroker::_t_bailedout_compilation;
191
192 uint CompileBroker::_total_bailout_count = 0;
193 uint CompileBroker::_total_invalidated_count = 0;
194 uint CompileBroker::_total_not_entrant_count = 0;
195 uint CompileBroker::_total_compile_count = 0;
196 uint CompileBroker::_total_osr_compile_count = 0;
197 uint CompileBroker::_total_standard_compile_count = 0;
198 uint CompileBroker::_total_compiler_stopped_count = 0;
199 uint CompileBroker::_total_compiler_restarted_count = 0;
200
201 uint CompileBroker::_sum_osr_bytes_compiled = 0;
202 uint CompileBroker::_sum_standard_bytes_compiled = 0;
203 uint CompileBroker::_sum_nmethod_size = 0;
204 uint CompileBroker::_sum_nmethod_code_size = 0;
205
206 jlong CompileBroker::_peak_compilation_time = 0;
207
208 CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization];
209 CompilerStatistics CompileBroker::_scc_stats;
210 CompilerStatistics CompileBroker::_scc_stats_per_level[CompLevel_full_optimization + 1];
211
212 CompileQueue* CompileBroker::_c3_compile_queue = nullptr;
213 CompileQueue* CompileBroker::_c2_compile_queue = nullptr;
214 CompileQueue* CompileBroker::_c1_compile_queue = nullptr;
215 CompileQueue* CompileBroker::_sc1_compile_queue = nullptr;
216 CompileQueue* CompileBroker::_sc2_compile_queue = nullptr;
217
218 bool compileBroker_init() {
219 if (LogEvents) {
220 CompilationLog::init();
221 }
222
223 // init directives stack, adding default directive
224 DirectivesStack::init();
225
226 if (DirectivesParser::has_file()) {
227 return DirectivesParser::parse_from_flag();
228 } else if (CompilerDirectivesPrint) {
229 // Print default directive even when no other was added
230 DirectivesStack::print(tty);
231 }
232
233 return true;
234 }
235
236 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
237 CompilerThread* thread = CompilerThread::current();
238 thread->set_task(task);
239 CompileLog* log = thread->log();
240 if (log != nullptr && !task->is_unloaded()) task->log_task_start(log);
241 }
242
243 CompileTaskWrapper::~CompileTaskWrapper() {
244 CompilerThread* thread = CompilerThread::current();
245 CompileTask* task = thread->task();
246 CompileLog* log = thread->log();
247 AbstractCompiler* comp = thread->compiler();
248 if (log != nullptr && !task->is_unloaded()) task->log_task_done(log);
249 thread->set_task(nullptr);
250 thread->set_env(nullptr);
251 if (task->is_blocking()) {
252 bool free_task = false;
253 {
254 MutexLocker notifier(thread, task->lock());
255 task->mark_complete();
256 #if INCLUDE_JVMCI
257 if (comp->is_jvmci()) {
258 if (!task->has_waiter()) {
259 // The waiting thread timed out and thus did not free the task.
260 free_task = true;
261 }
262 task->set_blocking_jvmci_compile_state(nullptr);
263 }
264 #endif
265 if (!free_task) {
266 // Notify the waiting thread that the compilation has completed
267 // so that it can free the task.
268 task->lock()->notify_all();
269 }
270 }
271 if (free_task) {
272 // The task can only be freed once the task lock is released.
273 CompileTask::free(task);
274 }
275 } else {
276 task->mark_complete();
277
278 // By convention, the compiling thread is responsible for
279 // recycling a non-blocking CompileTask.
280 CompileTask::free(task);
281 }
282 }
283
284 /**
285 * Check if a CompilerThread can be removed and update count if requested.
286 */
287 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
288 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
289 if (!ReduceNumberOfCompilerThreads) return false;
290
291 if (CompilationPolicy::have_recompilation_work()) return false;
292
293 AbstractCompiler *compiler = ct->compiler();
294 int compiler_count = compiler->num_compiler_threads();
295 bool c1 = compiler->is_c1();
296
297 // Keep at least 1 compiler thread of each type.
298 if (compiler_count < 2) return false;
299
300 // Keep thread alive for at least some time.
301 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
302
303 #if INCLUDE_JVMCI
304 if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
305 // Handles for JVMCI thread objects may get released concurrently.
306 if (do_it) {
307 assert(CompileThread_lock->owner() == ct, "must be holding lock");
308 } else {
309 // Skip check if it's the last thread and let caller check again.
310 return true;
311 }
312 }
313 #endif
314
315 // We only allow the last compiler thread of each type to get removed.
316 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
317 : compiler2_object(compiler_count - 1);
318 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
319 if (do_it) {
320 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
321 compiler->set_num_compiler_threads(compiler_count - 1);
322 #if INCLUDE_JVMCI
323 if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
324 // Old j.l.Thread object can die when no longer referenced elsewhere.
325 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
326 _compiler2_objects[compiler_count - 1] = nullptr;
327 }
328 #endif
329 }
330 return true;
331 }
332 return false;
333 }
334
335 /**
336 * Add a CompileTask to a CompileQueue.
337 */
338 void CompileQueue::add(CompileTask* task) {
339 assert(_lock->owned_by_self(), "must own lock");
340
341 task->set_next(nullptr);
342 task->set_prev(nullptr);
343
344 if (_last == nullptr) {
345 // The compile queue is empty.
346 assert(_first == nullptr, "queue is empty");
347 _first = task;
348 _last = task;
349 } else {
350 // Append the task to the queue.
351 assert(_last->next() == nullptr, "not last");
352 _last->set_next(task);
353 task->set_prev(_last);
354 _last = task;
355 }
356 ++_size;
357 ++_total_added;
358 if (_size > _peak_size) {
359 _peak_size = _size;
360 }
361
362 // Mark the method as being in the compile queue.
363 task->method()->set_queued_for_compilation();
364
365 task->mark_queued(os::elapsed_counter());
366
367 if (CIPrintCompileQueue) {
368 print_tty();
369 }
370
371 if (LogCompilation && xtty != nullptr) {
372 task->log_task_queued();
373 }
374
375 if (TrainingData::need_data() &&
376 !CDSConfig::is_dumping_final_static_archive()) { // FIXME: !!! MetaspaceShared::preload_and_dump() temporarily enables RecordTraining !!!
377 CompileTrainingData* tdata = CompileTrainingData::make(task);
378 if (tdata != nullptr) {
379 tdata->record_compilation_queued(task);
380 task->set_training_data(tdata);
381 }
382 }
383
384 // Notify CompilerThreads that a task is available.
385 _lock->notify_all();
386 }
387
388 void CompileQueue::add_pending(CompileTask* task) {
389 assert(_lock->owned_by_self() == false, "must NOT own lock");
390 assert(UseLockFreeCompileQueues, "");
391 task->method()->set_queued_for_compilation();
392 _queue.push(*task);
393 // FIXME: additional coordination needed? e.g., is it possible for compiler thread to block w/o processing pending tasks?
394 if (is_empty()) {
395 MutexLocker ml(_lock);
396 _lock->notify_all();
397 }
398 }
399
400 static bool process_pending(CompileTask* task) {
401 // guarantee(task->method()->queued_for_compilation(), "");
402 if (task->is_unloaded()) {
403 return true; // unloaded
404 }
405 task->method()->set_queued_for_compilation(); // FIXME
406 if (task->method()->pending_queue_processed()) {
407 return true; // already queued
408 }
409 // Mark the method as being in the compile queue.
410 task->method()->set_pending_queue_processed();
411 if (CompileBroker::compilation_is_complete(task->method(), task->osr_bci(), task->comp_level(),
412 task->requires_online_compilation(), task->compile_reason())) {
413 return true; // already compiled
414 }
415 return false; // active
416 }
417
418 void CompileQueue::transfer_pending() {
419 assert(_lock->owned_by_self(), "must own lock");
420 while (!_queue.empty()) {
421 CompileTask* task = _queue.pop();
422 bool is_stale = process_pending(task);
423 if (is_stale) {
424 task->set_next(_first_stale);
425 task->set_prev(nullptr);
426 _first_stale = task;
427 } else {
428 add(task);
429 }
430 }
431 }
432
433 /**
434 * Empties compilation queue by putting all compilation tasks onto
435 * a freelist. Furthermore, the method wakes up all threads that are
436 * waiting on a compilation task to finish. This can happen if background
437 * compilation is disabled.
438 */
439 void CompileQueue::free_all() {
440 MutexLocker mu(_lock);
441 transfer_pending();
442
443 CompileTask* next = _first;
444
445 // Iterate over all tasks in the compile queue
446 while (next != nullptr) {
447 CompileTask* current = next;
448 next = current->next();
449 {
450 // Wake up thread that blocks on the compile task.
451 MutexLocker ct_lock(current->lock());
452 current->lock()->notify();
453 }
454 // Put the task back on the freelist.
455 CompileTask::free(current);
456 }
457 _first = nullptr;
458 _last = nullptr;
459
460 // Wake up all threads that block on the queue.
461 _lock->notify_all();
462 }
463
464 /**
465 * Get the next CompileTask from a CompileQueue
466 */
467 CompileTask* CompileQueue::get(CompilerThread* thread) {
468 // save methods from RedefineClasses across safepoint
469 // across compile queue lock below.
470 methodHandle save_method;
471 methodHandle save_hot_method;
472
473 MonitorLocker locker(_lock);
474 transfer_pending();
475
476 CompilationPolicy::sample_load_average();
477
478 // If _first is null we have no more compile jobs. There are two reasons for
479 // having no compile jobs: First, we compiled everything we wanted. Second,
480 // we ran out of code cache so compilation has been disabled. In the latter
481 // case we perform code cache sweeps to free memory such that we can re-enable
482 // compilation.
483 while (_first == nullptr) {
484 // Exit loop if compilation is disabled forever
485 if (CompileBroker::is_compilation_disabled_forever()) {
486 return nullptr;
487 }
488
489 AbstractCompiler* compiler = thread->compiler();
490 guarantee(compiler != nullptr, "Compiler object must exist");
491 compiler->on_empty_queue(this, thread);
492 if (_first != nullptr) {
493 // The call to on_empty_queue may have temporarily unlocked the MCQ lock
494 // so check again whether any tasks were added to the queue.
495 break;
496 }
497
498 // If there are no compilation tasks and we can compile new jobs
499 // (i.e., there is enough free space in the code cache) there is
500 // no need to invoke the GC.
501 // We need a timed wait here, since compiler threads can exit if compilation
502 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
503 // is not critical and we do not want idle compiler threads to wake up too often.
504 locker.wait(5*1000);
505
506 transfer_pending(); // reacquired lock
507
508 if (CompilationPolicy::have_recompilation_work()) return nullptr;
509
510 if (UseDynamicNumberOfCompilerThreads && _first == nullptr) {
511 // Still nothing to compile. Give caller a chance to stop this thread.
512 if (CompileBroker::can_remove(CompilerThread::current(), false)) return nullptr;
513 }
514 }
515
516 if (CompileBroker::is_compilation_disabled_forever()) {
517 return nullptr;
518 }
519
520 CompileTask* task;
521 {
522 NoSafepointVerifier nsv;
523 task = CompilationPolicy::select_task(this, thread);
524 if (task != nullptr) {
525 task = task->select_for_compilation();
526 }
527 }
528
529 if (task != nullptr) {
530 // Save method pointers across unlock safepoint. The task is removed from
531 // the compilation queue, which is walked during RedefineClasses.
532 Thread* thread = Thread::current();
533 save_method = methodHandle(thread, task->method());
534 save_hot_method = methodHandle(thread, task->hot_method());
535
536 remove(task);
537 }
538 purge_stale_tasks(); // may temporarily release MCQ lock
539 return task;
540 }
541
542 // Clean & deallocate stale compile tasks.
543 // Temporarily releases MethodCompileQueue lock.
544 void CompileQueue::purge_stale_tasks() {
545 assert(_lock->owned_by_self(), "must own lock");
546 if (_first_stale != nullptr) {
547 // Stale tasks are purged when MCQ lock is released,
548 // but _first_stale updates are protected by MCQ lock.
549 // Once task processing starts and MCQ lock is released,
550 // other compiler threads can reuse _first_stale.
551 CompileTask* head = _first_stale;
552 _first_stale = nullptr;
553 {
554 MutexUnlocker ul(_lock);
555 for (CompileTask* task = head; task != nullptr; ) {
556 CompileTask* next_task = task->next();
557 CompileTaskWrapper ctw(task); // Frees the task
558 task->set_failure_reason("stale task");
559 task = next_task;
560 }
561 }
562 transfer_pending(); // transfer pending after reacquiring MCQ lock
563 }
564 }
565
566 void CompileQueue::remove(CompileTask* task) {
567 assert(_lock->owned_by_self(), "must own lock");
568 if (task->prev() != nullptr) {
569 task->prev()->set_next(task->next());
570 } else {
571 // max is the first element
572 assert(task == _first, "Sanity");
573 _first = task->next();
574 }
575
576 if (task->next() != nullptr) {
577 task->next()->set_prev(task->prev());
578 } else {
579 // max is the last element
580 assert(task == _last, "Sanity");
581 _last = task->prev();
582 }
583 --_size;
584 ++_total_removed;
585 }
586
587 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
588 assert(_lock->owned_by_self(), "must own lock");
589 remove(task);
590
591 // Enqueue the task for reclamation (should be done outside MCQ lock)
592 task->set_next(_first_stale);
593 task->set_prev(nullptr);
594 _first_stale = task;
595 }
596
597 // methods in the compile queue need to be marked as used on the stack
598 // so that they don't get reclaimed by Redefine Classes
599 void CompileQueue::mark_on_stack() {
600 for (CompileTask* task = _first; task != nullptr; task = task->next()) {
601 task->mark_on_stack();
602 }
603 for (CompileTask* task = _queue.first(); !_queue.is_end(task); task = task->next()) {
604 assert(task != nullptr, "");
605 task->mark_on_stack();
606 }
607 }
608
609
610 CompileQueue* CompileBroker::compile_queue(int comp_level, bool is_scc) {
611 if (is_c2_compile(comp_level)) return (is_scc ? _sc2_compile_queue : _c2_compile_queue);
612 if (is_c1_compile(comp_level)) return (is_scc ? _sc1_compile_queue : _c1_compile_queue);
613 return nullptr;
614 }
615
616 CompileQueue* CompileBroker::c1_compile_queue() {
617 return _c1_compile_queue;
618 }
619
620 CompileQueue* CompileBroker::c2_compile_queue() {
621 return _c2_compile_queue;
622 }
623
624 void CompileBroker::print_compile_queues(outputStream* st) {
625 st->print_cr("Current compiles: ");
626
627 char buf[2000];
628 int buflen = sizeof(buf);
629 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
630
631 st->cr();
632 if (_c1_compile_queue != nullptr) {
633 _c1_compile_queue->print(st);
634 }
635 if (_c2_compile_queue != nullptr) {
636 _c2_compile_queue->print(st);
637 }
638 if (_c3_compile_queue != nullptr) {
639 _c3_compile_queue->print(st);
640 }
641 if (_sc1_compile_queue != nullptr) {
642 _sc1_compile_queue->print(st);
643 }
644 if (_sc2_compile_queue != nullptr) {
645 _sc2_compile_queue->print(st);
646 }
647 }
648
649 void CompileQueue::print(outputStream* st) {
650 assert_locked_or_safepoint(_lock);
651 st->print_cr("%s:", name());
652 CompileTask* task = _first;
653 if (task == nullptr) {
654 st->print_cr("Empty");
655 } else {
656 while (task != nullptr) {
657 task->print(st, nullptr, true, true);
658 task = task->next();
659 }
660 }
661 st->cr();
662 }
663
664 void CompileQueue::print_tty() {
665 stringStream ss;
666 // Dump the compile queue into a buffer before locking the tty
667 print(&ss);
668 {
669 ttyLocker ttyl;
670 tty->print("%s", ss.freeze());
671 }
672 }
673
674 CompilerCounters::CompilerCounters() {
675 _current_method[0] = '\0';
676 _compile_type = CompileBroker::no_compile;
677 }
678
679 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
680 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
681 // in compiler/compilerEvent.cpp) and registers it with its serializer.
682 //
683 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
684 // so if c2 is used, it should be always registered first.
685 // This function is called during vm initialization.
686 static void register_jfr_phasetype_serializer(CompilerType compiler_type) {
687 ResourceMark rm;
688 static bool first_registration = true;
689 if (compiler_type == compiler_jvmci) {
690 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
691 first_registration = false;
692 #ifdef COMPILER2
693 } else if (compiler_type == compiler_c2) {
694 assert(first_registration, "invariant"); // c2 must be registered first.
695 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
696 const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i);
697 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
698 }
699 first_registration = false;
700 #endif // COMPILER2
701 }
702 }
703 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
704
705 // ------------------------------------------------------------------
706 // CompileBroker::compilation_init
707 //
708 // Initialize the Compilation object
709 void CompileBroker::compilation_init(JavaThread* THREAD) {
710 // No need to initialize compilation system if we do not use it.
711 if (!UseCompiler) {
712 return;
713 }
714 // Set the interface to the current compiler(s).
715 _c1_count = CompilationPolicy::c1_count();
716 _c2_count = CompilationPolicy::c2_count();
717 _c3_count = CompilationPolicy::c3_count();
718 _sc_count = CompilationPolicy::sc_count();
719
720 #if INCLUDE_JVMCI
721 if (EnableJVMCI) {
722 // This is creating a JVMCICompiler singleton.
723 JVMCICompiler* jvmci = new JVMCICompiler();
724
725 if (UseJVMCICompiler) {
726 _compilers[1] = jvmci;
727 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
728 if (BootstrapJVMCI) {
729 // JVMCI will bootstrap so give it more threads
730 _c2_count = MIN2(32, os::active_processor_count());
731 }
732 } else {
733 _c2_count = JVMCIThreads;
734 }
735 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
736 } else {
737 #ifdef COMPILER1
738 _c1_count = JVMCIHostThreads;
739 #endif // COMPILER1
740 }
741 #ifdef COMPILER2
742 if (SCCache::is_on() && (_c3_count > 0)) {
743 _compilers[2] = new C2Compiler();
744 }
745 #endif
746 }
747 }
748 #endif // INCLUDE_JVMCI
749
750 #ifdef COMPILER1
751 if (_c1_count > 0) {
752 _compilers[0] = new Compiler();
753 }
754 #endif // COMPILER1
755
756 #ifdef COMPILER2
757 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
758 if (_c2_count > 0) {
759 _compilers[1] = new C2Compiler();
760 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
761 // idToPhase mapping for c2 is in opto/phasetype.hpp
762 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
763 }
764 }
765 #endif // COMPILER2
766
767 #if INCLUDE_JVMCI
768 // Register after c2 registration.
769 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
770 if (EnableJVMCI) {
771 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
772 }
773 #endif // INCLUDE_JVMCI
774
775 if (CompilerOracle::should_collect_memstat()) {
776 CompilationMemoryStatistic::initialize();
777 }
778
779 // Start the compiler thread(s)
780 init_compiler_threads();
781 // totalTime performance counter is always created as it is required
782 // by the implementation of java.lang.management.CompilationMXBean.
783 {
784 // Ensure OOM leads to vm_exit_during_initialization.
785 EXCEPTION_MARK;
786 _perf_total_compilation =
787 PerfDataManager::create_counter(JAVA_CI, "totalTime",
788 PerfData::U_Ticks, CHECK);
789 }
790
791 if (UsePerfData) {
792
793 EXCEPTION_MARK;
794
795 // create the jvmstat performance counters
796 _perf_osr_compilation =
797 PerfDataManager::create_counter(SUN_CI, "osrTime",
798 PerfData::U_Ticks, CHECK);
799
800 _perf_standard_compilation =
801 PerfDataManager::create_counter(SUN_CI, "standardTime",
802 PerfData::U_Ticks, CHECK);
803
804 _perf_total_bailout_count =
805 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
806 PerfData::U_Events, CHECK);
807
808 _perf_total_invalidated_count =
809 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
810 PerfData::U_Events, CHECK);
811
812 _perf_total_compile_count =
813 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
814 PerfData::U_Events, CHECK);
815 _perf_total_osr_compile_count =
816 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
817 PerfData::U_Events, CHECK);
818
819 _perf_total_standard_compile_count =
820 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
821 PerfData::U_Events, CHECK);
822
823 _perf_sum_osr_bytes_compiled =
824 PerfDataManager::create_counter(SUN_CI, "osrBytes",
825 PerfData::U_Bytes, CHECK);
826
827 _perf_sum_standard_bytes_compiled =
828 PerfDataManager::create_counter(SUN_CI, "standardBytes",
829 PerfData::U_Bytes, CHECK);
830
831 _perf_sum_nmethod_size =
832 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
833 PerfData::U_Bytes, CHECK);
834
835 _perf_sum_nmethod_code_size =
836 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
837 PerfData::U_Bytes, CHECK);
838
839 _perf_last_method =
840 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
841 CompilerCounters::cmname_buffer_length,
842 "", CHECK);
843
844 _perf_last_failed_method =
845 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
846 CompilerCounters::cmname_buffer_length,
847 "", CHECK);
848
849 _perf_last_invalidated_method =
850 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
851 CompilerCounters::cmname_buffer_length,
852 "", CHECK);
853
854 _perf_last_compile_type =
855 PerfDataManager::create_variable(SUN_CI, "lastType",
856 PerfData::U_None,
857 (jlong)CompileBroker::no_compile,
858 CHECK);
859
860 _perf_last_compile_size =
861 PerfDataManager::create_variable(SUN_CI, "lastSize",
862 PerfData::U_Bytes,
863 (jlong)CompileBroker::no_compile,
864 CHECK);
865
866
867 _perf_last_failed_type =
868 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
869 PerfData::U_None,
870 (jlong)CompileBroker::no_compile,
871 CHECK);
872
873 _perf_last_invalidated_type =
874 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
875 PerfData::U_None,
876 (jlong)CompileBroker::no_compile,
877 CHECK);
878 }
879
880 log_info(scc, init)("CompileBroker is initialized");
881 _initialized = true;
882 }
883
884 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
885 Handle thread_oop = JavaThread::create_system_thread_object(name, CHECK_NH);
886 return thread_oop;
887 }
888
889 void TrainingReplayThread::training_replay_thread_entry(JavaThread* thread, TRAPS) {
890 CompilationPolicy::replay_training_at_init_loop(thread);
891 }
892
893 #if defined(ASSERT) && COMPILER2_OR_JVMCI
894 // Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to
895 // the running java application. Configured with vm options DeoptimizeObjectsALot*.
896 class DeoptimizeObjectsALotThread : public JavaThread {
897
898 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS);
899 void deoptimize_objects_alot_loop_single();
900 void deoptimize_objects_alot_loop_all();
901
902 public:
903 DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { }
904
905 bool is_hidden_from_external_view() const { return true; }
906 };
907
908 // Entry for DeoptimizeObjectsALotThread. The threads are started in
909 // CompileBroker::init_compiler_threads() iff DeoptimizeObjectsALot is enabled
910 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
911 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
912 bool enter_single_loop;
913 {
914 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
915 static int single_thread_count = 0;
916 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
917 }
918 if (enter_single_loop) {
919 dt->deoptimize_objects_alot_loop_single();
920 } else {
921 dt->deoptimize_objects_alot_loop_all();
922 }
923 }
924
925 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
926 // barrier targets a single thread which is selected round robin.
927 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
928 HandleMark hm(this);
929 while (true) {
930 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
931 { // Begin new scope for escape barrier
932 HandleMarkCleaner hmc(this);
933 ResourceMark rm(this);
934 EscapeBarrier eb(true, this, deoptee_thread);
935 eb.deoptimize_objects(100);
936 }
937 // Now sleep after the escape barriers destructor resumed deoptee_thread.
938 sleep(DeoptimizeObjectsALotInterval);
939 }
940 }
941 }
942
943 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
944 // barrier targets all java threads in the vm at once.
945 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
946 HandleMark hm(this);
947 while (true) {
948 { // Begin new scope for escape barrier
949 HandleMarkCleaner hmc(this);
950 ResourceMark rm(this);
951 EscapeBarrier eb(true, this);
952 eb.deoptimize_objects_all_threads();
953 }
954 // Now sleep after the escape barriers destructor resumed the java threads.
955 sleep(DeoptimizeObjectsALotInterval);
956 }
957 }
958 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
959
960
961 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
962 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
963
964 if (java_lang_Thread::thread(thread_oop()) != nullptr) {
965 assert(type == compiler_t, "should only happen with reused compiler threads");
966 // The compiler thread hasn't actually exited yet so don't try to reuse it
967 return nullptr;
968 }
969
970 JavaThread* new_thread = nullptr;
971 switch (type) {
972 case compiler_t:
973 assert(comp != nullptr, "Compiler instance missing.");
974 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
975 CompilerCounters* counters = new CompilerCounters();
976 new_thread = new CompilerThread(queue, counters);
977 }
978 break;
979 #if defined(ASSERT) && COMPILER2_OR_JVMCI
980 case deoptimizer_t:
981 new_thread = new DeoptimizeObjectsALotThread();
982 break;
983 #endif // ASSERT
984 case training_replay_t:
985 new_thread = new TrainingReplayThread();
986 break;
987 default:
988 ShouldNotReachHere();
989 }
990
991 // At this point the new CompilerThread data-races with this startup
992 // thread (which is the main thread and NOT the VM thread).
993 // This means Java bytecodes being executed at startup can
994 // queue compile jobs which will run at whatever default priority the
995 // newly created CompilerThread runs at.
996
997
998 // At this point it may be possible that no osthread was created for the
999 // JavaThread due to lack of resources. We will handle that failure below.
1000 // Also check new_thread so that static analysis is happy.
1001 if (new_thread != nullptr && new_thread->osthread() != nullptr) {
1002
1003 if (type == compiler_t) {
1004 CompilerThread::cast(new_thread)->set_compiler(comp);
1005 }
1006
1007 // Note that we cannot call os::set_priority because it expects Java
1008 // priorities and we are *explicitly* using OS priorities so that it's
1009 // possible to set the compiler thread priority higher than any Java
1010 // thread.
1011
1012 int native_prio = CompilerThreadPriority;
1013 if (native_prio == -1) {
1014 if (UseCriticalCompilerThreadPriority) {
1015 native_prio = os::java_to_os_priority[CriticalPriority];
1016 } else {
1017 native_prio = os::java_to_os_priority[NearMaxPriority];
1018 }
1019 }
1020 os::set_native_priority(new_thread, native_prio);
1021
1022 // Note that this only sets the JavaThread _priority field, which by
1023 // definition is limited to Java priorities and not OS priorities.
1024 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
1025
1026 } else { // osthread initialization failure
1027 if (UseDynamicNumberOfCompilerThreads && type == compiler_t
1028 && comp->num_compiler_threads() > 0) {
1029 // The new thread is not known to Thread-SMR yet so we can just delete.
1030 delete new_thread;
1031 return nullptr;
1032 } else {
1033 vm_exit_during_initialization("java.lang.OutOfMemoryError",
1034 os::native_thread_creation_failed_msg());
1035 }
1036 }
1037
1038 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
1039
1040 return new_thread;
1041 }
1042
1043 static bool trace_compiler_threads() {
1044 LogTarget(Debug, jit, thread) lt;
1045 return TraceCompilerThreads || lt.is_enabled();
1046 }
1047
1048 static jobject create_compiler_thread(AbstractCompiler* compiler, int i, TRAPS) {
1049 char name_buffer[256];
1050 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", compiler->name(), i);
1051 Handle thread_oop = JavaThread::create_system_thread_object(name_buffer, CHECK_NULL);
1052 return JNIHandles::make_global(thread_oop);
1053 }
1054
1055 static void print_compiler_threads(stringStream& msg) {
1056 if (TraceCompilerThreads) {
1057 tty->print_cr("%7d %s", (int)tty->time_stamp().milliseconds(), msg.as_string());
1058 }
1059 LogTarget(Debug, jit, thread) lt;
1060 if (lt.is_enabled()) {
1061 LogStream ls(lt);
1062 ls.print_cr("%s", msg.as_string());
1063 }
1064 }
1065
1066 static void print_compiler_thread(JavaThread *ct) {
1067 if (trace_compiler_threads()) {
1068 ResourceMark rm;
1069 ThreadsListHandle tlh; // name() depends on the TLH.
1070 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1071 stringStream msg;
1072 msg.print("Added initial compiler thread %s", ct->name());
1073 print_compiler_threads(msg);
1074 }
1075 }
1076
1077 void CompileBroker::init_compiler_threads() {
1078 // Ensure any exceptions lead to vm_exit_during_initialization.
1079 EXCEPTION_MARK;
1080 #if !defined(ZERO)
1081 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
1082 #endif // !ZERO
1083 // Initialize the compilation queue
1084 if (_c2_count > 0) {
1085 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
1086 _c2_compile_queue = new CompileQueue(name, MethodCompileQueueC2_lock);
1087 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
1088 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
1089 }
1090 if (_c1_count > 0) {
1091 _c1_compile_queue = new CompileQueue("C1 compile queue", MethodCompileQueueC1_lock);
1092 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
1093 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
1094 }
1095
1096 if (_c3_count > 0) {
1097 const char* name = "C2 compile queue";
1098 _c3_compile_queue = new CompileQueue(name, MethodCompileQueueC3_lock);
1099 _compiler3_objects = NEW_C_HEAP_ARRAY(jobject, _c3_count, mtCompiler);
1100 _compiler3_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c3_count, mtCompiler);
1101 }
1102 if (_sc_count > 0) {
1103 if (_c1_count > 0) { // C1 is present
1104 _sc1_compile_queue = new CompileQueue("C1 SC compile queue", MethodCompileQueueSC1_lock);
1105 }
1106 if (_c2_count > 0) { // C2 is present
1107 _sc2_compile_queue = new CompileQueue("C2 SC compile queue", MethodCompileQueueSC2_lock);
1108 }
1109 _sc_objects = NEW_C_HEAP_ARRAY(jobject, _sc_count, mtCompiler);
1110 _sc_logs = NEW_C_HEAP_ARRAY(CompileLog*, _sc_count, mtCompiler);
1111 }
1112 char name_buffer[256];
1113
1114 for (int i = 0; i < _c2_count; i++) {
1115 // Create a name for our thread.
1116 jobject thread_handle = create_compiler_thread(_compilers[1], i, CHECK);
1117 _compiler2_objects[i] = thread_handle;
1118 _compiler2_logs[i] = nullptr;
1119
1120 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1121 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
1122 assert(ct != nullptr, "should have been handled for initial thread");
1123 _compilers[1]->set_num_compiler_threads(i + 1);
1124 print_compiler_thread(ct);
1125 }
1126 }
1127
1128 for (int i = 0; i < _c1_count; i++) {
1129 // Create a name for our thread.
1130 jobject thread_handle = create_compiler_thread(_compilers[0], i, CHECK);
1131 _compiler1_objects[i] = thread_handle;
1132 _compiler1_logs[i] = nullptr;
1133
1134 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1135 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
1136 assert(ct != nullptr, "should have been handled for initial thread");
1137 _compilers[0]->set_num_compiler_threads(i + 1);
1138 print_compiler_thread(ct);
1139 }
1140 }
1141
1142 for (int i = 0; i < _c3_count; i++) {
1143 // Create a name for our thread.
1144 os::snprintf_checked(name_buffer, sizeof(name_buffer), "C2 CompilerThread%d", i);
1145 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1146 jobject thread_handle = JNIHandles::make_global(thread_oop);
1147 _compiler3_objects[i] = thread_handle;
1148 _compiler3_logs[i] = nullptr;
1149
1150 JavaThread *ct = make_thread(compiler_t, thread_handle, _c3_compile_queue, _compilers[2], THREAD);
1151 assert(ct != nullptr, "should have been handled for initial thread");
1152 _compilers[2]->set_num_compiler_threads(i + 1);
1153 print_compiler_thread(ct);
1154 }
1155
1156 if (_sc_count > 0) {
1157 int i = 0;
1158 if (_c1_count > 0) { // C1 is present
1159 os::snprintf_checked(name_buffer, sizeof(name_buffer), "C%d SC CompilerThread", 1);
1160 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1161 jobject thread_handle = JNIHandles::make_global(thread_oop);
1162 _sc_objects[i] = thread_handle;
1163 _sc_logs[i] = nullptr;
1164 i++;
1165
1166 JavaThread *ct = make_thread(compiler_t, thread_handle, _sc1_compile_queue, _compilers[0], THREAD);
1167 assert(ct != nullptr, "should have been handled for initial thread");
1168 print_compiler_thread(ct);
1169 }
1170 if (_c2_count > 0) { // C2 is present
1171 os::snprintf_checked(name_buffer, sizeof(name_buffer), "C%d SC CompilerThread", 2);
1172 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1173 jobject thread_handle = JNIHandles::make_global(thread_oop);
1174 _sc_objects[i] = thread_handle;
1175 _sc_logs[i] = nullptr;
1176
1177 JavaThread *ct = make_thread(compiler_t, thread_handle, _sc2_compile_queue, _compilers[1], THREAD);
1178 assert(ct != nullptr, "should have been handled for initial thread");
1179 print_compiler_thread(ct);
1180 }
1181 }
1182
1183 if (UsePerfData) {
1184 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count + _c3_count, CHECK);
1185 }
1186
1187 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1188 if (DeoptimizeObjectsALot) {
1189 // Initialize and start the object deoptimizer threads
1190 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1191 for (int count = 0; count < total_count; count++) {
1192 Handle thread_oop = JavaThread::create_system_thread_object("Deoptimize objects a lot single mode", CHECK);
1193 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1194 make_thread(deoptimizer_t, thread_handle, nullptr, nullptr, THREAD);
1195 }
1196 }
1197 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1198 }
1199
1200 void CompileBroker::init_training_replay() {
1201 // Ensure any exceptions lead to vm_exit_during_initialization.
1202 EXCEPTION_MARK;
1203 if (TrainingData::have_data()) {
1204 if (UseConcurrentTrainingReplay) {
1205 Handle thread_oop = create_thread_oop("Training replay thread", CHECK);
1206 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1207 make_thread(training_replay_t, thread_handle, nullptr, nullptr, THREAD);
1208 }
1209 _replay_initialized = true;
1210 }
1211 }
1212
1213 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
1214
1215 julong free_memory = os::free_memory();
1216 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1217 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1218 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1219
1220 // Only do attempt to start additional threads if the lock is free.
1221 if (!CompileThread_lock->try_lock()) return;
1222
1223 if (_c2_compile_queue != nullptr) {
1224 int old_c2_count = _compilers[1]->num_compiler_threads();
1225 int new_c2_count = MIN4(_c2_count,
1226 _c2_compile_queue->size() / 2,
1227 (int)(free_memory / (200*M)),
1228 (int)(available_cc_np / (128*K)));
1229
1230 for (int i = old_c2_count; i < new_c2_count; i++) {
1231 #if INCLUDE_JVMCI
1232 if (UseJVMCICompiler && !UseJVMCINativeLibrary && _compiler2_objects[i] == nullptr) {
1233 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread objects as their
1234 // existence is completely hidden from the rest of the VM (and those compiler threads can't
1235 // call Java code to do the creation anyway).
1236 //
1237 // For pure Java JVMCI we have to create new j.l.Thread objects as they are visible and we
1238 // can see unexpected thread lifecycle transitions if we bind them to new JavaThreads. For
1239 // native library JVMCI it's preferred to use the C1/C2 strategy as this avoids unnecessary
1240 // coupling with Java.
1241 if (!THREAD->can_call_java()) break;
1242 char name_buffer[256];
1243 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i);
1244 Handle thread_oop;
1245 {
1246 // We have to give up the lock temporarily for the Java calls.
1247 MutexUnlocker mu(CompileThread_lock);
1248 thread_oop = JavaThread::create_system_thread_object(name_buffer, THREAD);
1249 }
1250 if (HAS_PENDING_EXCEPTION) {
1251 if (trace_compiler_threads()) {
1252 ResourceMark rm;
1253 stringStream msg;
1254 msg.print_cr("JVMCI compiler thread creation failed:");
1255 PENDING_EXCEPTION->print_on(&msg);
1256 print_compiler_threads(msg);
1257 }
1258 CLEAR_PENDING_EXCEPTION;
1259 break;
1260 }
1261 // Check if another thread has beaten us during the Java calls.
1262 if (_compilers[1]->num_compiler_threads() != i) break;
1263 jobject thread_handle = JNIHandles::make_global(thread_oop);
1264 assert(compiler2_object(i) == nullptr, "Old one must be released!");
1265 _compiler2_objects[i] = thread_handle;
1266 }
1267 #endif
1268 guarantee(compiler2_object(i) != nullptr, "Thread oop must exist");
1269 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1270 if (ct == nullptr) break;
1271 _compilers[1]->set_num_compiler_threads(i + 1);
1272 if (trace_compiler_threads()) {
1273 ResourceMark rm;
1274 ThreadsListHandle tlh; // name() depends on the TLH.
1275 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1276 stringStream msg;
1277 msg.print("Added compiler thread %s (free memory: %dMB, available non-profiled code cache: %dMB)",
1278 ct->name(), (int)(free_memory/M), (int)(available_cc_np/M));
1279 print_compiler_threads(msg);
1280 }
1281 }
1282 }
1283
1284 if (_c1_compile_queue != nullptr) {
1285 int old_c1_count = _compilers[0]->num_compiler_threads();
1286 int new_c1_count = MIN4(_c1_count,
1287 _c1_compile_queue->size() / 4,
1288 (int)(free_memory / (100*M)),
1289 (int)(available_cc_p / (128*K)));
1290
1291 for (int i = old_c1_count; i < new_c1_count; i++) {
1292 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1293 if (ct == nullptr) break;
1294 _compilers[0]->set_num_compiler_threads(i + 1);
1295 if (trace_compiler_threads()) {
1296 ResourceMark rm;
1297 ThreadsListHandle tlh; // name() depends on the TLH.
1298 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1299 stringStream msg;
1300 msg.print("Added compiler thread %s (free memory: %dMB, available profiled code cache: %dMB)",
1301 ct->name(), (int)(free_memory/M), (int)(available_cc_p/M));
1302 print_compiler_threads(msg);
1303 }
1304 }
1305 }
1306
1307 CompileThread_lock->unlock();
1308 }
1309
1310
1311 /**
1312 * Set the methods on the stack as on_stack so that redefine classes doesn't
1313 * reclaim them. This method is executed at a safepoint.
1314 */
1315 void CompileBroker::mark_on_stack() {
1316 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1317 // Since we are at a safepoint, we do not need a lock to access
1318 // the compile queues.
1319 if (_c3_compile_queue != nullptr) {
1320 _c3_compile_queue->mark_on_stack();
1321 }
1322 if (_c2_compile_queue != nullptr) {
1323 _c2_compile_queue->mark_on_stack();
1324 }
1325 if (_c1_compile_queue != nullptr) {
1326 _c1_compile_queue->mark_on_stack();
1327 }
1328 if (_sc1_compile_queue != nullptr) {
1329 _sc1_compile_queue->mark_on_stack();
1330 }
1331 if (_sc2_compile_queue != nullptr) {
1332 _sc2_compile_queue->mark_on_stack();
1333 }
1334 }
1335
1336 // ------------------------------------------------------------------
1337 // CompileBroker::compile_method
1338 //
1339 // Request compilation of a method.
1340 void CompileBroker::compile_method_base(const methodHandle& method,
1341 int osr_bci,
1342 int comp_level,
1343 const methodHandle& hot_method,
1344 int hot_count,
1345 CompileTask::CompileReason compile_reason,
1346 bool requires_online_compilation,
1347 bool blocking,
1348 Thread* thread) {
1349 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1350 assert(method->method_holder()->is_instance_klass(),
1351 "sanity check");
1352 assert(!method->method_holder()->is_not_initialized() ||
1353 compile_reason == CompileTask::Reason_Preload ||
1354 compile_reason == CompileTask::Reason_Precompile ||
1355 compile_reason == CompileTask::Reason_PrecompileForPreload, "method holder must be initialized");
1356 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1357
1358 if (CIPrintRequests) {
1359 tty->print("request: ");
1360 method->print_short_name(tty);
1361 if (osr_bci != InvocationEntryBci) {
1362 tty->print(" osr_bci: %d", osr_bci);
1363 }
1364 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1365 if (!hot_method.is_null()) {
1366 tty->print(" hot: ");
1367 if (hot_method() != method()) {
1368 hot_method->print_short_name(tty);
1369 } else {
1370 tty->print("yes");
1371 }
1372 }
1373 tty->cr();
1374 }
1375
1376 // A request has been made for compilation. Before we do any
1377 // real work, check to see if the method has been compiled
1378 // in the meantime with a definitive result.
1379 if (compilation_is_complete(method(), osr_bci, comp_level, requires_online_compilation, compile_reason)) {
1380 return;
1381 }
1382
1383 #ifndef PRODUCT
1384 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1385 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1386 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1387 return;
1388 }
1389 }
1390 #endif
1391
1392 // If this method is already in the compile queue, then
1393 // we do not block the current thread.
1394 if (compilation_is_in_queue(method)) {
1395 // We may want to decay our counter a bit here to prevent
1396 // multiple denied requests for compilation. This is an
1397 // open compilation policy issue. Note: The other possibility,
1398 // in the case that this is a blocking compile request, is to have
1399 // all subsequent blocking requesters wait for completion of
1400 // ongoing compiles. Note that in this case we'll need a protocol
1401 // for freeing the associated compile tasks. [Or we could have
1402 // a single static monitor on which all these waiters sleep.]
1403 return;
1404 }
1405
1406 // Tiered policy requires MethodCounters to exist before adding a method to
1407 // the queue. Create if we don't have them yet.
1408 if (compile_reason != CompileTask::Reason_Preload) {
1409 method->get_method_counters(thread);
1410 }
1411
1412 SCCEntry* scc_entry = find_scc_entry(method, osr_bci, comp_level, compile_reason, requires_online_compilation);
1413 bool is_scc = (scc_entry != nullptr);
1414
1415 // Outputs from the following MutexLocker block:
1416 CompileTask* task = nullptr;
1417 CompileQueue* queue;
1418 #if INCLUDE_JVMCI
1419 if (is_c2_compile(comp_level) && compiler2()->is_jvmci() && compiler3() != nullptr &&
1420 ((JVMCICompiler*)compiler2())->force_comp_at_level_simple(method)) {
1421 assert(_c3_compile_queue != nullptr, "sanity");
1422 queue = _c3_compile_queue; // JVMCI compiler's methods compilation
1423 } else
1424 #endif
1425 queue = compile_queue(comp_level, is_scc);
1426
1427 // Acquire our lock.
1428 {
1429 ConditionalMutexLocker locker(thread, queue->lock(), !UseLockFreeCompileQueues);
1430
1431 // Make sure the method has not slipped into the queues since
1432 // last we checked; note that those checks were "fast bail-outs".
1433 // Here we need to be more careful, see 14012000 below.
1434 if (compilation_is_in_queue(method)) {
1435 return;
1436 }
1437
1438 // We need to check again to see if the compilation has
1439 // completed. A previous compilation may have registered
1440 // some result.
1441 if (compilation_is_complete(method(), osr_bci, comp_level, requires_online_compilation, compile_reason)) {
1442 return;
1443 }
1444
1445 // We now know that this compilation is not pending, complete,
1446 // or prohibited. Assign a compile_id to this compilation
1447 // and check to see if it is in our [Start..Stop) range.
1448 int compile_id = assign_compile_id(method, osr_bci);
1449 if (compile_id == 0) {
1450 // The compilation falls outside the allowed range.
1451 return;
1452 }
1453
1454 #if INCLUDE_JVMCI
1455 if (UseJVMCICompiler && blocking) {
1456 // Don't allow blocking compiles for requests triggered by JVMCI.
1457 if (thread->is_Compiler_thread()) {
1458 blocking = false;
1459 }
1460
1461 // In libjvmci, JVMCI initialization should not deadlock with other threads
1462 if (!UseJVMCINativeLibrary) {
1463 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1464 vframeStream vfst(JavaThread::cast(thread));
1465 for (; !vfst.at_end(); vfst.next()) {
1466 if (vfst.method()->is_static_initializer() ||
1467 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1468 vfst.method()->name() == vmSymbols::loadClass_name())) {
1469 blocking = false;
1470 break;
1471 }
1472 }
1473
1474 // Don't allow blocking compilation requests to JVMCI
1475 // if JVMCI itself is not yet initialized
1476 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1477 blocking = false;
1478 }
1479 }
1480
1481 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1482 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1483 // such as the DestroyJavaVM thread.
1484 if (JVMCI::in_shutdown()) {
1485 blocking = false;
1486 }
1487 }
1488 #endif // INCLUDE_JVMCI
1489
1490 // We will enter the compilation in the queue.
1491 // 14012000: Note that this sets the queued_for_compile bits in
1492 // the target method. We can now reason that a method cannot be
1493 // queued for compilation more than once, as follows:
1494 // Before a thread queues a task for compilation, it first acquires
1495 // the compile queue lock, then checks if the method's queued bits
1496 // are set or it has already been compiled. Thus there can not be two
1497 // instances of a compilation task for the same method on the
1498 // compilation queue. Consider now the case where the compilation
1499 // thread has already removed a task for that method from the queue
1500 // and is in the midst of compiling it. In this case, the
1501 // queued_for_compile bits must be set in the method (and these
1502 // will be visible to the current thread, since the bits were set
1503 // under protection of the compile queue lock, which we hold now.
1504 // When the compilation completes, the compiler thread first sets
1505 // the compilation result and then clears the queued_for_compile
1506 // bits. Neither of these actions are protected by a barrier (or done
1507 // under the protection of a lock), so the only guarantee we have
1508 // (on machines with TSO (Total Store Order)) is that these values
1509 // will update in that order. As a result, the only combinations of
1510 // these bits that the current thread will see are, in temporal order:
1511 // <RESULT, QUEUE> :
1512 // <0, 1> : in compile queue, but not yet compiled
1513 // <1, 1> : compiled but queue bit not cleared
1514 // <1, 0> : compiled and queue bit cleared
1515 // Because we first check the queue bits then check the result bits,
1516 // we are assured that we cannot introduce a duplicate task.
1517 // Note that if we did the tests in the reverse order (i.e. check
1518 // result then check queued bit), we could get the result bit before
1519 // the compilation completed, and the queue bit after the compilation
1520 // completed, and end up introducing a "duplicate" (redundant) task.
1521 // In that case, the compiler thread should first check if a method
1522 // has already been compiled before trying to compile it.
1523 // NOTE: in the event that there are multiple compiler threads and
1524 // there is de-optimization/recompilation, things will get hairy,
1525 // and in that case it's best to protect both the testing (here) of
1526 // these bits, and their updating (here and elsewhere) under a
1527 // common lock.
1528 task = create_compile_task(queue,
1529 compile_id, method,
1530 osr_bci, comp_level,
1531 hot_method, hot_count, scc_entry, compile_reason,
1532 requires_online_compilation, blocking);
1533
1534 if (task->is_scc() && (_sc_count > 0)) {
1535 // Put it on SC queue
1536 queue = is_c1_compile(comp_level) ? _sc1_compile_queue : _sc2_compile_queue;
1537 }
1538
1539 if (UseLockFreeCompileQueues) {
1540 assert(queue->lock()->owned_by_self() == false, "");
1541 queue->add_pending(task);
1542 } else {
1543 queue->add(task);
1544 }
1545 }
1546
1547 if (blocking) {
1548 wait_for_completion(task);
1549 }
1550 }
1551
1552 SCCEntry* CompileBroker::find_scc_entry(const methodHandle& method, int osr_bci, int comp_level,
1553 CompileTask::CompileReason compile_reason,
1554 bool requires_online_compilation) {
1555 SCCEntry* scc_entry = nullptr;
1556 if (_sc_count > 0 && osr_bci == InvocationEntryBci && !requires_online_compilation && SCCache::is_on_for_read()) {
1557 // Check for cached code.
1558 if (compile_reason == CompileTask::Reason_Preload) {
1559 scc_entry = method->scc_entry();
1560 assert(scc_entry != nullptr && scc_entry->for_preload(), "sanity");
1561 } else {
1562 scc_entry = SCCache::find_code_entry(method, comp_level);
1563 }
1564 }
1565 return scc_entry;
1566 }
1567
1568 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1569 int comp_level,
1570 const methodHandle& hot_method, int hot_count,
1571 bool requires_online_compilation,
1572 CompileTask::CompileReason compile_reason,
1573 TRAPS) {
1574 // Do nothing if compilebroker is not initialized or compiles are submitted on level none
1575 if (!_initialized || comp_level == CompLevel_none) {
1576 return nullptr;
1577 }
1578
1579 #if INCLUDE_JVMCI
1580 if (EnableJVMCI && UseJVMCICompiler &&
1581 comp_level == CompLevel_full_optimization && !ClassPreloader::class_preloading_finished()) {
1582 return nullptr;
1583 }
1584 #endif
1585
1586 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1587 assert(comp != nullptr, "Ensure we have a compiler");
1588
1589 #if INCLUDE_JVMCI
1590 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1591 // JVMCI compilation is not yet initializable.
1592 return nullptr;
1593 }
1594 #endif
1595
1596 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1597 // CompileBroker::compile_method can trap and can have pending async exception.
1598 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, requires_online_compilation, compile_reason, directive, THREAD);
1599 DirectivesStack::release(directive);
1600 return nm;
1601 }
1602
1603 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1604 int comp_level,
1605 const methodHandle& hot_method, int hot_count,
1606 bool requires_online_compilation,
1607 CompileTask::CompileReason compile_reason,
1608 DirectiveSet* directive,
1609 TRAPS) {
1610
1611 // make sure arguments make sense
1612 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1613 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1614 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1615 assert(!method->method_holder()->is_not_initialized() ||
1616 compile_reason == CompileTask::Reason_Preload ||
1617 compile_reason == CompileTask::Reason_Precompile ||
1618 compile_reason == CompileTask::Reason_PrecompileForPreload, "method holder must be initialized");
1619 // return quickly if possible
1620
1621 if (PrecompileOnlyAndExit && !CompileTask::reason_is_precompiled(compile_reason)) {
1622 return nullptr;
1623 }
1624
1625 // lock, make sure that the compilation
1626 // isn't prohibited in a straightforward way.
1627 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1628 if (comp == nullptr || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1629 return nullptr;
1630 }
1631
1632 if (osr_bci == InvocationEntryBci) {
1633 // standard compilation
1634 nmethod* method_code = method->code();
1635 if (method_code != nullptr) {
1636 if (compilation_is_complete(method(), osr_bci, comp_level, requires_online_compilation, compile_reason)) {
1637 return method_code;
1638 }
1639 }
1640 if (method->is_not_compilable(comp_level)) {
1641 return nullptr;
1642 }
1643 } else {
1644 // osr compilation
1645 // We accept a higher level osr method
1646 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1647 if (nm != nullptr) return nm;
1648 if (method->is_not_osr_compilable(comp_level)) return nullptr;
1649 }
1650
1651 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1652 // some prerequisites that are compiler specific
1653 if (compile_reason != CompileTask::Reason_Preload && (comp->is_c2() || comp->is_jvmci())) {
1654 InternalOOMEMark iom(THREAD);
1655 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1656 // Resolve all classes seen in the signature of the method
1657 // we are compiling.
1658 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1659 }
1660
1661 // If the method is native, do the lookup in the thread requesting
1662 // the compilation. Native lookups can load code, which is not
1663 // permitted during compilation.
1664 //
1665 // Note: A native method implies non-osr compilation which is
1666 // checked with an assertion at the entry of this method.
1667 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1668 address adr = NativeLookup::lookup(method, THREAD);
1669 if (HAS_PENDING_EXCEPTION) {
1670 // In case of an exception looking up the method, we just forget
1671 // about it. The interpreter will kick-in and throw the exception.
1672 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1673 CLEAR_PENDING_EXCEPTION;
1674 return nullptr;
1675 }
1676 assert(method->has_native_function(), "must have native code by now");
1677 }
1678
1679 // RedefineClasses() has replaced this method; just return
1680 if (method->is_old()) {
1681 return nullptr;
1682 }
1683
1684 // JVMTI -- post_compile_event requires jmethod_id() that may require
1685 // a lock the compiling thread can not acquire. Prefetch it here.
1686 if (JvmtiExport::should_post_compiled_method_load()) {
1687 method->jmethod_id();
1688 }
1689
1690 // do the compilation
1691 if (method->is_native()) {
1692 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1693 #if defined(X86) && !defined(ZERO)
1694 // The following native methods:
1695 //
1696 // java.lang.Float.intBitsToFloat
1697 // java.lang.Float.floatToRawIntBits
1698 // java.lang.Double.longBitsToDouble
1699 // java.lang.Double.doubleToRawLongBits
1700 //
1701 // are called through the interpreter even if interpreter native stubs
1702 // are not preferred (i.e., calling through adapter handlers is preferred).
1703 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1704 // if the version of the methods from the native libraries is called.
1705 // As the interpreter and the C2-intrinsified version of the methods preserves
1706 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1707 if ((UseSSE >= 1 &&
1708 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1709 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1710 (UseSSE >= 2 &&
1711 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1712 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1713 return nullptr;
1714 }
1715 #endif // X86 && !ZERO
1716
1717 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1718 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1719 //
1720 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1721 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1722 AdapterHandlerLibrary::create_native_wrapper(method);
1723 } else {
1724 return nullptr;
1725 }
1726 } else {
1727 // If the compiler is shut off due to code cache getting full
1728 // fail out now so blocking compiles dont hang the java thread
1729 if (!should_compile_new_jobs()) {
1730 return nullptr;
1731 }
1732 bool is_blocking = ReplayCompiles ||
1733 !directive->BackgroundCompilationOption ||
1734 (compile_reason == CompileTask::Reason_Precompile) ||
1735 (compile_reason == CompileTask::Reason_PrecompileForPreload);
1736 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, requires_online_compilation, is_blocking, THREAD);
1737 }
1738
1739 // return requested nmethod
1740 // We accept a higher level osr method
1741 if (osr_bci == InvocationEntryBci) {
1742 return method->code();
1743 }
1744 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1745 }
1746
1747
1748 // ------------------------------------------------------------------
1749 // CompileBroker::compilation_is_complete
1750 //
1751 // See if compilation of this method is already complete.
1752 bool CompileBroker::compilation_is_complete(Method* method,
1753 int osr_bci,
1754 int comp_level,
1755 bool online_only,
1756 CompileTask::CompileReason compile_reason) {
1757 if (compile_reason == CompileTask::Reason_Precompile ||
1758 compile_reason == CompileTask::Reason_PrecompileForPreload) {
1759 return false; // FIXME: any restrictions?
1760 }
1761 bool is_osr = (osr_bci != standard_entry_bci);
1762 if (is_osr) {
1763 if (method->is_not_osr_compilable(comp_level)) {
1764 return true;
1765 } else {
1766 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1767 return (result != nullptr);
1768 }
1769 } else {
1770 if (method->is_not_compilable(comp_level)) {
1771 return true;
1772 } else {
1773 nmethod* result = method->code();
1774 if (result == nullptr) {
1775 return false;
1776 }
1777 if (online_only && result->is_scc()) {
1778 return false;
1779 }
1780 bool same_level = (comp_level == result->comp_level());
1781 if (result->has_clinit_barriers()) {
1782 return !same_level; // Allow replace preloaded code with new code of the same level
1783 }
1784 return same_level;
1785 }
1786 }
1787 }
1788
1789
1790 /**
1791 * See if this compilation is already requested.
1792 *
1793 * Implementation note: there is only a single "is in queue" bit
1794 * for each method. This means that the check below is overly
1795 * conservative in the sense that an osr compilation in the queue
1796 * will block a normal compilation from entering the queue (and vice
1797 * versa). This can be remedied by a full queue search to disambiguate
1798 * cases. If it is deemed profitable, this may be done.
1799 */
1800 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1801 return method->queued_for_compilation();
1802 }
1803
1804 // ------------------------------------------------------------------
1805 // CompileBroker::compilation_is_prohibited
1806 //
1807 // See if this compilation is not allowed.
1808 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1809 bool is_native = method->is_native();
1810 // Some compilers may not support the compilation of natives.
1811 AbstractCompiler *comp = compiler(comp_level);
1812 if (is_native && (!CICompileNatives || comp == nullptr)) {
1813 method->set_not_compilable_quietly("native methods not supported", comp_level);
1814 return true;
1815 }
1816
1817 bool is_osr = (osr_bci != standard_entry_bci);
1818 // Some compilers may not support on stack replacement.
1819 if (is_osr && (!CICompileOSR || comp == nullptr)) {
1820 method->set_not_osr_compilable("OSR not supported", comp_level);
1821 return true;
1822 }
1823
1824 // The method may be explicitly excluded by the user.
1825 double scale;
1826 if (excluded || (CompilerOracle::has_option_value(method, CompileCommandEnum::CompileThresholdScaling, scale) && scale == 0)) {
1827 bool quietly = CompilerOracle::be_quiet();
1828 if (PrintCompilation && !quietly) {
1829 // This does not happen quietly...
1830 ResourceMark rm;
1831 tty->print("### Excluding %s:%s",
1832 method->is_native() ? "generation of native wrapper" : "compile",
1833 (method->is_static() ? " static" : ""));
1834 method->print_short_name(tty);
1835 tty->cr();
1836 }
1837 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1838 }
1839
1840 return false;
1841 }
1842
1843 /**
1844 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1845 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1846 * The function also allows to generate separate compilation IDs for OSR compilations.
1847 */
1848 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1849 #ifdef ASSERT
1850 bool is_osr = (osr_bci != standard_entry_bci);
1851 int id;
1852 if (method->is_native()) {
1853 assert(!is_osr, "can't be osr");
1854 // Adapters, native wrappers and method handle intrinsics
1855 // should be generated always.
1856 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1857 } else if (CICountOSR && is_osr) {
1858 id = Atomic::add(&_osr_compilation_id, 1);
1859 if (CIStartOSR <= id && id < CIStopOSR) {
1860 return id;
1861 }
1862 } else {
1863 id = Atomic::add(&_compilation_id, 1);
1864 if (CIStart <= id && id < CIStop) {
1865 return id;
1866 }
1867 }
1868
1869 // Method was not in the appropriate compilation range.
1870 method->set_not_compilable_quietly("Not in requested compile id range");
1871 return 0;
1872 #else
1873 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1874 // only _compilation_id is incremented.
1875 return Atomic::add(&_compilation_id, 1);
1876 #endif
1877 }
1878
1879 // ------------------------------------------------------------------
1880 // CompileBroker::assign_compile_id_unlocked
1881 //
1882 // Public wrapper for assign_compile_id that acquires the needed locks
1883 int CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1884 return assign_compile_id(method, osr_bci);
1885 }
1886
1887 // ------------------------------------------------------------------
1888 // CompileBroker::create_compile_task
1889 //
1890 // Create a CompileTask object representing the current request for
1891 // compilation. Add this task to the queue.
1892 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1893 int compile_id,
1894 const methodHandle& method,
1895 int osr_bci,
1896 int comp_level,
1897 const methodHandle& hot_method,
1898 int hot_count,
1899 SCCEntry* scc_entry,
1900 CompileTask::CompileReason compile_reason,
1901 bool requires_online_compilation,
1902 bool blocking) {
1903 CompileTask* new_task = CompileTask::allocate();
1904 new_task->initialize(compile_id, method, osr_bci, comp_level,
1905 hot_method, hot_count, scc_entry, compile_reason, queue,
1906 requires_online_compilation, blocking);
1907 return new_task;
1908 }
1909
1910 #if INCLUDE_JVMCI
1911 // The number of milliseconds to wait before checking if
1912 // JVMCI compilation has made progress.
1913 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1914
1915 // The number of JVMCI compilation progress checks that must fail
1916 // before unblocking a thread waiting for a blocking compilation.
1917 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1918
1919 /**
1920 * Waits for a JVMCI compiler to complete a given task. This thread
1921 * waits until either the task completes or it sees no JVMCI compilation
1922 * progress for N consecutive milliseconds where N is
1923 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1924 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1925 *
1926 * @return true if this thread needs to free/recycle the task
1927 */
1928 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1929 assert(UseJVMCICompiler, "sanity");
1930 MonitorLocker ml(thread, task->lock());
1931 int progress_wait_attempts = 0;
1932 jint thread_jvmci_compilation_ticks = 0;
1933 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1934 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1935 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1936 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1937
1938 bool progress;
1939 if (jvmci_compile_state != nullptr) {
1940 jint ticks = jvmci_compile_state->compilation_ticks();
1941 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1942 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1943 thread_jvmci_compilation_ticks = ticks;
1944 } else {
1945 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1946 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1947 // compilation ticks to determine whether JVMCI compilation
1948 // is still making progress through the JVMCI compiler queue.
1949 jint ticks = jvmci->global_compilation_ticks();
1950 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1951 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1952 global_jvmci_compilation_ticks = ticks;
1953 }
1954
1955 if (!progress) {
1956 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1957 if (PrintCompilation) {
1958 task->print(tty, "wait for blocking compilation timed out");
1959 }
1960 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1961 break;
1962 }
1963 } else {
1964 progress_wait_attempts = 0;
1965 }
1966 }
1967 task->clear_waiter();
1968 return task->is_complete();
1969 }
1970 #endif
1971
1972 /**
1973 * Wait for the compilation task to complete.
1974 */
1975 void CompileBroker::wait_for_completion(CompileTask* task) {
1976 if (CIPrintCompileQueue) {
1977 ttyLocker ttyl;
1978 tty->print_cr("BLOCKING FOR COMPILE");
1979 }
1980
1981 assert(task->is_blocking(), "can only wait on blocking task");
1982
1983 JavaThread* thread = JavaThread::current();
1984
1985 methodHandle method(thread, task->method());
1986 bool free_task;
1987 #if INCLUDE_JVMCI
1988 AbstractCompiler* comp = compiler(task->comp_level());
1989 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) {
1990 // It may return before compilation is completed.
1991 // Note that libjvmci should not pre-emptively unblock
1992 // a thread waiting for a compilation as it does not call
1993 // Java code and so is not deadlock prone like jarjvmci.
1994 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1995 } else
1996 #endif
1997 {
1998 MonitorLocker ml(thread, task->lock());
1999 free_task = true;
2000 while (!task->is_complete() && !is_compilation_disabled_forever()) {
2001 ml.wait();
2002 }
2003 }
2004
2005 if (free_task) {
2006 if (is_compilation_disabled_forever()) {
2007 CompileTask::free(task);
2008 return;
2009 }
2010
2011 // It is harmless to check this status without the lock, because
2012 // completion is a stable property (until the task object is recycled).
2013 assert(task->is_complete(), "Compilation should have completed");
2014
2015 // By convention, the waiter is responsible for recycling a
2016 // blocking CompileTask. Since there is only one waiter ever
2017 // waiting on a CompileTask, we know that no one else will
2018 // be using this CompileTask; we can free it.
2019 CompileTask::free(task);
2020 }
2021 }
2022
2023 /**
2024 * Initialize compiler thread(s) + compiler object(s). The postcondition
2025 * of this function is that the compiler runtimes are initialized and that
2026 * compiler threads can start compiling.
2027 */
2028 bool CompileBroker::init_compiler_runtime() {
2029 CompilerThread* thread = CompilerThread::current();
2030 AbstractCompiler* comp = thread->compiler();
2031 // Final sanity check - the compiler object must exist
2032 guarantee(comp != nullptr, "Compiler object must exist");
2033
2034 {
2035 // Must switch to native to allocate ci_env
2036 ThreadToNativeFromVM ttn(thread);
2037 ciEnv ci_env((CompileTask*)nullptr);
2038 // Cache Jvmti state
2039 ci_env.cache_jvmti_state();
2040 // Cache DTrace flags
2041 ci_env.cache_dtrace_flags();
2042
2043 // Switch back to VM state to do compiler initialization
2044 ThreadInVMfromNative tv(thread);
2045
2046 // Perform per-thread and global initializations
2047 {
2048 MutexLocker only_one (thread, CompileThread_lock);
2049 SCCache::init_table();
2050 }
2051 comp->initialize();
2052 }
2053
2054 if (comp->is_failed()) {
2055 disable_compilation_forever();
2056 // If compiler initialization failed, no compiler thread that is specific to a
2057 // particular compiler runtime will ever start to compile methods.
2058 shutdown_compiler_runtime(comp, thread);
2059 return false;
2060 }
2061
2062 // C1 specific check
2063 if (comp->is_c1() && (thread->get_buffer_blob() == nullptr)) {
2064 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
2065 return false;
2066 }
2067
2068 return true;
2069 }
2070
2071 void CompileBroker::free_buffer_blob_if_allocated(CompilerThread* thread) {
2072 BufferBlob* blob = thread->get_buffer_blob();
2073 if (blob != nullptr) {
2074 blob->purge();
2075 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2076 CodeCache::free(blob);
2077 }
2078 }
2079
2080 /**
2081 * If C1 and/or C2 initialization failed, we shut down all compilation.
2082 * We do this to keep things simple. This can be changed if it ever turns
2083 * out to be a problem.
2084 */
2085 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
2086 free_buffer_blob_if_allocated(thread);
2087
2088 log_info(compilation)("shutdown_compiler_runtime: " INTPTR_FORMAT, p2i(thread));
2089
2090 if (comp->should_perform_shutdown()) {
2091 // There are two reasons for shutting down the compiler
2092 // 1) compiler runtime initialization failed
2093 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
2094 warning("%s initialization failed. Shutting down all compilers", comp->name());
2095
2096 // Only one thread per compiler runtime object enters here
2097 // Set state to shut down
2098 comp->set_shut_down();
2099
2100 // Delete all queued compilation tasks to make compiler threads exit faster.
2101 if (_c1_compile_queue != nullptr) {
2102 _c1_compile_queue->free_all();
2103 }
2104
2105 if (_c2_compile_queue != nullptr) {
2106 _c2_compile_queue->free_all();
2107 }
2108
2109 if (_c3_compile_queue != nullptr) {
2110 _c3_compile_queue->free_all();
2111 }
2112
2113 // Set flags so that we continue execution with using interpreter only.
2114 UseCompiler = false;
2115 UseInterpreter = true;
2116
2117 // We could delete compiler runtimes also. However, there are references to
2118 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
2119 // fail. This can be done later if necessary.
2120 }
2121 }
2122
2123 /**
2124 * Helper function to create new or reuse old CompileLog.
2125 */
2126 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
2127 if (!LogCompilation) return nullptr;
2128
2129 AbstractCompiler *compiler = ct->compiler();
2130 bool jvmci = JVMCI_ONLY( compiler->is_jvmci() ||) false;
2131 bool c1 = compiler->is_c1();
2132 jobject* compiler_objects = c1 ? _compiler1_objects : (_c3_count == 0 ? _compiler2_objects : (jvmci ? _compiler2_objects : _compiler3_objects));
2133 assert(compiler_objects != nullptr, "must be initialized at this point");
2134 CompileLog** logs = c1 ? _compiler1_logs : (_c3_count == 0 ? _compiler2_logs : (jvmci ? _compiler2_logs : _compiler3_logs));
2135 assert(logs != nullptr, "must be initialized at this point");
2136 int count = c1 ? _c1_count : (_c3_count == 0 ? _c2_count : (jvmci ? _c2_count : _c3_count));
2137
2138 if (ct->queue() == _sc1_compile_queue || ct->queue() == _sc2_compile_queue) {
2139 compiler_objects = _sc_objects;
2140 logs = _sc_logs;
2141 count = _sc_count;
2142 }
2143 // Find Compiler number by its threadObj.
2144 oop compiler_obj = ct->threadObj();
2145 int compiler_number = 0;
2146 bool found = false;
2147 for (; compiler_number < count; compiler_number++) {
2148 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
2149 found = true;
2150 break;
2151 }
2152 }
2153 assert(found, "Compiler must exist at this point");
2154
2155 // Determine pointer for this thread's log.
2156 CompileLog** log_ptr = &logs[compiler_number];
2157
2158 // Return old one if it exists.
2159 CompileLog* log = *log_ptr;
2160 if (log != nullptr) {
2161 ct->init_log(log);
2162 return log;
2163 }
2164
2165 // Create a new one and remember it.
2166 init_compiler_thread_log();
2167 log = ct->log();
2168 *log_ptr = log;
2169 return log;
2170 }
2171
2172 // ------------------------------------------------------------------
2173 // CompileBroker::compiler_thread_loop
2174 //
2175 // The main loop run by a CompilerThread.
2176 void CompileBroker::compiler_thread_loop() {
2177 CompilerThread* thread = CompilerThread::current();
2178 CompileQueue* queue = thread->queue();
2179 // For the thread that initializes the ciObjectFactory
2180 // this resource mark holds all the shared objects
2181 ResourceMark rm;
2182
2183 // First thread to get here will initialize the compiler interface
2184
2185 {
2186 ASSERT_IN_VM;
2187 MutexLocker only_one (thread, CompileThread_lock);
2188 if (!ciObjectFactory::is_initialized()) {
2189 ciObjectFactory::initialize();
2190 }
2191 }
2192
2193 // Open a log.
2194 CompileLog* log = get_log(thread);
2195 if (log != nullptr) {
2196 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
2197 thread->name(),
2198 os::current_thread_id(),
2199 os::current_process_id());
2200 log->stamp();
2201 log->end_elem();
2202 }
2203
2204 // If compiler thread/runtime initialization fails, exit the compiler thread
2205 if (!init_compiler_runtime()) {
2206 return;
2207 }
2208
2209 thread->start_idle_timer();
2210
2211 // Poll for new compilation tasks as long as the JVM runs. Compilation
2212 // should only be disabled if something went wrong while initializing the
2213 // compiler runtimes. This, in turn, should not happen. The only known case
2214 // when compiler runtime initialization fails is if there is not enough free
2215 // space in the code cache to generate the necessary stubs, etc.
2216 while (!is_compilation_disabled_forever()) {
2217 // We need this HandleMark to avoid leaking VM handles.
2218 HandleMark hm(thread);
2219
2220 CompilationPolicy::recompilation_step(RecompilationWorkUnitSize, thread);
2221
2222 CompileTask* task = queue->get(thread);
2223
2224 if (task == nullptr) {
2225 if (UseDynamicNumberOfCompilerThreads) {
2226 // Access compiler_count under lock to enforce consistency.
2227 MutexLocker only_one(CompileThread_lock);
2228 if (can_remove(thread, true)) {
2229 if (trace_compiler_threads()) {
2230 ResourceMark rm;
2231 stringStream msg;
2232 msg.print("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
2233 thread->name(), thread->idle_time_millis());
2234 print_compiler_threads(msg);
2235 }
2236
2237 // Notify compiler that the compiler thread is about to stop
2238 thread->compiler()->stopping_compiler_thread(thread);
2239
2240 free_buffer_blob_if_allocated(thread);
2241 return; // Stop this thread.
2242 }
2243 }
2244 } else {
2245 // Assign the task to the current thread. Mark this compilation
2246 // thread as active for the profiler.
2247 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
2248 // occurs after fetching the compile task off the queue.
2249 CompileTaskWrapper ctw(task);
2250 methodHandle method(thread, task->method());
2251
2252 // Never compile a method if breakpoints are present in it
2253 if (method()->number_of_breakpoints() == 0) {
2254 // Compile the method.
2255 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
2256 invoke_compiler_on_method(task);
2257 thread->start_idle_timer();
2258 } else {
2259 // After compilation is disabled, remove remaining methods from queue
2260 method->clear_queued_for_compilation();
2261 method->set_pending_queue_processed(false);
2262 task->set_failure_reason("compilation is disabled");
2263 }
2264 } else {
2265 task->set_failure_reason("breakpoints are present");
2266 }
2267
2268 if (UseDynamicNumberOfCompilerThreads) {
2269 possibly_add_compiler_threads(thread);
2270 assert(!thread->has_pending_exception(), "should have been handled");
2271 }
2272 }
2273 }
2274
2275 // Shut down compiler runtime
2276 shutdown_compiler_runtime(thread->compiler(), thread);
2277 }
2278
2279 // ------------------------------------------------------------------
2280 // CompileBroker::init_compiler_thread_log
2281 //
2282 // Set up state required by +LogCompilation.
2283 void CompileBroker::init_compiler_thread_log() {
2284 CompilerThread* thread = CompilerThread::current();
2285 char file_name[4*K];
2286 FILE* fp = nullptr;
2287 intx thread_id = os::current_thread_id();
2288 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
2289 const char* dir = (try_temp_dir ? os::get_temp_directory() : nullptr);
2290 if (dir == nullptr) {
2291 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
2292 thread_id, os::current_process_id());
2293 } else {
2294 jio_snprintf(file_name, sizeof(file_name),
2295 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
2296 os::file_separator(), thread_id, os::current_process_id());
2297 }
2298
2299 fp = os::fopen(file_name, "wt");
2300 if (fp != nullptr) {
2301 if (LogCompilation && Verbose) {
2302 tty->print_cr("Opening compilation log %s", file_name);
2303 }
2304 CompileLog* log = new(mtCompiler) CompileLog(file_name, fp, thread_id);
2305 if (log == nullptr) {
2306 fclose(fp);
2307 return;
2308 }
2309 thread->init_log(log);
2310
2311 if (xtty != nullptr) {
2312 ttyLocker ttyl;
2313 // Record any per thread log files
2314 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2315 }
2316 return;
2317 }
2318 }
2319 warning("Cannot open log file: %s", file_name);
2320 }
2321
2322 void CompileBroker::log_metaspace_failure() {
2323 const char* message = "some methods may not be compiled because metaspace "
2324 "is out of memory";
2325 if (CompilationLog::log() != nullptr) {
2326 CompilationLog::log()->log_metaspace_failure(message);
2327 }
2328 if (PrintCompilation) {
2329 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2330 }
2331 }
2332
2333
2334 // ------------------------------------------------------------------
2335 // CompileBroker::set_should_block
2336 //
2337 // Set _should_block.
2338 // Call this from the VM, with Threads_lock held and a safepoint requested.
2339 void CompileBroker::set_should_block() {
2340 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2341 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2342 #ifndef PRODUCT
2343 if (PrintCompilation && (Verbose || WizardMode))
2344 tty->print_cr("notifying compiler thread pool to block");
2345 #endif
2346 _should_block = true;
2347 }
2348
2349 // ------------------------------------------------------------------
2350 // CompileBroker::maybe_block
2351 //
2352 // Call this from the compiler at convenient points, to poll for _should_block.
2353 void CompileBroker::maybe_block() {
2354 if (_should_block) {
2355 #ifndef PRODUCT
2356 if (PrintCompilation && (Verbose || WizardMode))
2357 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2358 #endif
2359 ThreadInVMfromNative tivfn(JavaThread::current());
2360 }
2361 }
2362
2363 // wrapper for CodeCache::print_summary()
2364 static void codecache_print(bool detailed)
2365 {
2366 stringStream s;
2367 // Dump code cache into a buffer before locking the tty,
2368 {
2369 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2370 CodeCache::print_summary(&s, detailed);
2371 }
2372 ttyLocker ttyl;
2373 tty->print("%s", s.freeze());
2374 }
2375
2376 // wrapper for CodeCache::print_summary() using outputStream
2377 static void codecache_print(outputStream* out, bool detailed) {
2378 stringStream s;
2379
2380 // Dump code cache into a buffer
2381 {
2382 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2383 CodeCache::print_summary(&s, detailed);
2384 }
2385
2386 char* remaining_log = s.as_string();
2387 while (*remaining_log != '\0') {
2388 char* eol = strchr(remaining_log, '\n');
2389 if (eol == nullptr) {
2390 out->print_cr("%s", remaining_log);
2391 remaining_log = remaining_log + strlen(remaining_log);
2392 } else {
2393 *eol = '\0';
2394 out->print_cr("%s", remaining_log);
2395 remaining_log = eol + 1;
2396 }
2397 }
2398 }
2399
2400 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env,
2401 int compilable, const char* failure_reason) {
2402 if (!AbortVMOnCompilationFailure) {
2403 return;
2404 }
2405 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2406 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2407 }
2408 if (compilable == ciEnv::MethodCompilable_never) {
2409 fatal("Never compilable: %s", failure_reason);
2410 }
2411 }
2412
2413 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2414 assert(task != nullptr, "invariant");
2415 CompilerEvent::CompilationEvent::post(event,
2416 task->compile_id(),
2417 task->compiler()->type(),
2418 task->method(),
2419 task->comp_level(),
2420 task->is_success(),
2421 task->osr_bci() != CompileBroker::standard_entry_bci,
2422 task->nm_total_size(),
2423 task->num_inlined_bytecodes(),
2424 task->arena_bytes());
2425 }
2426
2427 int DirectivesStack::_depth = 0;
2428 CompilerDirectives* DirectivesStack::_top = nullptr;
2429 CompilerDirectives* DirectivesStack::_bottom = nullptr;
2430
2431 // Acquires Compilation_lock and waits for it to be notified
2432 // as long as WhiteBox::compilation_locked is true.
2433 static void whitebox_lock_compilation() {
2434 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2435 while (WhiteBox::compilation_locked) {
2436 locker.wait();
2437 }
2438 }
2439
2440 // ------------------------------------------------------------------
2441 // CompileBroker::invoke_compiler_on_method
2442 //
2443 // Compile a method.
2444 //
2445 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2446 task->print_ul();
2447 elapsedTimer time;
2448
2449 DirectiveSet* directive = task->directive();
2450 if (directive->PrintCompilationOption) {
2451 ResourceMark rm;
2452 task->print_tty();
2453 }
2454
2455 CompilerThread* thread = CompilerThread::current();
2456 ResourceMark rm(thread);
2457
2458 if (CompilationLog::log() != nullptr) {
2459 CompilationLog::log()->log_compile(thread, task);
2460 }
2461
2462 // Common flags.
2463 int compile_id = task->compile_id();
2464 int osr_bci = task->osr_bci();
2465 bool is_osr = (osr_bci != standard_entry_bci);
2466 bool should_log = (thread->log() != nullptr);
2467 bool should_break = false;
2468 const int task_level = task->comp_level();
2469 AbstractCompiler* comp = task->compiler();
2470 CompileTrainingData* tdata = task->training_data();
2471 assert(tdata == nullptr || TrainingData::need_data() ||
2472 CDSConfig::is_dumping_preimage_static_archive(), ""); // FIXME: MetaspaceShared::preload_and_dump() messes with RecordTraining flag
2473 {
2474 // create the handle inside it's own block so it can't
2475 // accidentally be referenced once the thread transitions to
2476 // native. The NoHandleMark before the transition should catch
2477 // any cases where this occurs in the future.
2478 methodHandle method(thread, task->method());
2479
2480 assert(!method->is_native(), "no longer compile natives");
2481
2482 // Update compile information when using perfdata.
2483 if (UsePerfData) {
2484 update_compile_perf_data(thread, method, is_osr);
2485 }
2486
2487 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2488 }
2489
2490 if (tdata != nullptr) {
2491 tdata->record_compilation_start(task);
2492 }
2493
2494 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2495 if (should_log && !directive->LogOption) {
2496 should_log = false;
2497 }
2498
2499 // Allocate a new set of JNI handles.
2500 JNIHandleMark jhm(thread);
2501 Method* target_handle = task->method();
2502 int compilable = ciEnv::MethodCompilable;
2503 const char* failure_reason = nullptr;
2504 bool failure_reason_on_C_heap = false;
2505 const char* retry_message = nullptr;
2506
2507 #if INCLUDE_JVMCI
2508 if (UseJVMCICompiler && comp != nullptr && comp->is_jvmci()) {
2509 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2510
2511 TraceTime t1("compilation", &time);
2512 EventCompilation event;
2513 JVMCICompileState compile_state(task, jvmci);
2514 JVMCIRuntime *runtime = nullptr;
2515
2516 if (JVMCI::in_shutdown()) {
2517 failure_reason = "in JVMCI shutdown";
2518 retry_message = "not retryable";
2519 compilable = ciEnv::MethodCompilable_never;
2520 } else if (compile_state.target_method_is_old()) {
2521 // Skip redefined methods
2522 failure_reason = "redefined method";
2523 retry_message = "not retryable";
2524 compilable = ciEnv::MethodCompilable_never;
2525 } else {
2526 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2527 if (env.init_error() != JNI_OK) {
2528 const char* msg = env.init_error_msg();
2529 failure_reason = os::strdup(err_msg("Error attaching to libjvmci (err: %d, %s)",
2530 env.init_error(), msg == nullptr ? "unknown" : msg), mtJVMCI);
2531 bool reason_on_C_heap = true;
2532 // In case of JNI_ENOMEM, there's a good chance a subsequent attempt to create libjvmci or attach to it
2533 // might succeed. Other errors most likely indicate a non-recoverable error in the JVMCI runtime.
2534 bool retryable = env.init_error() == JNI_ENOMEM;
2535 compile_state.set_failure(retryable, failure_reason, reason_on_C_heap);
2536 }
2537 if (failure_reason == nullptr) {
2538 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2539 // Must switch to native to block
2540 ThreadToNativeFromVM ttn(thread);
2541 whitebox_lock_compilation();
2542 }
2543 methodHandle method(thread, target_handle);
2544 runtime = env.runtime();
2545 runtime->compile_method(&env, jvmci, method, osr_bci);
2546
2547 failure_reason = compile_state.failure_reason();
2548 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2549 if (!compile_state.retryable()) {
2550 retry_message = "not retryable";
2551 compilable = ciEnv::MethodCompilable_not_at_tier;
2552 }
2553 if (!task->is_success()) {
2554 assert(failure_reason != nullptr, "must specify failure_reason");
2555 }
2556 }
2557 }
2558 if (!task->is_success() && !JVMCI::in_shutdown()) {
2559 handle_compile_error(thread, task, nullptr, compilable, failure_reason);
2560 }
2561 if (event.should_commit()) {
2562 post_compilation_event(event, task);
2563 }
2564
2565 if (runtime != nullptr) {
2566 runtime->post_compile(thread);
2567 }
2568 } else
2569 #endif // INCLUDE_JVMCI
2570 {
2571 NoHandleMark nhm;
2572 ThreadToNativeFromVM ttn(thread);
2573
2574 ciEnv ci_env(task);
2575 if (should_break) {
2576 ci_env.set_break_at_compile(true);
2577 }
2578 if (should_log) {
2579 ci_env.set_log(thread->log());
2580 }
2581 assert(thread->env() == &ci_env, "set by ci_env");
2582 // The thread-env() field is cleared in ~CompileTaskWrapper.
2583
2584 // Cache Jvmti state
2585 bool method_is_old = ci_env.cache_jvmti_state();
2586
2587 // Skip redefined methods
2588 if (method_is_old) {
2589 ci_env.record_method_not_compilable("redefined method", true);
2590 }
2591
2592 // Cache DTrace flags
2593 ci_env.cache_dtrace_flags();
2594
2595 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2596
2597 TraceTime t1("compilation", &time);
2598 EventCompilation event;
2599
2600 bool install_code = true;
2601 if (comp == nullptr) {
2602 ci_env.record_method_not_compilable("no compiler");
2603 } else if (!ci_env.failing()) {
2604 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2605 whitebox_lock_compilation();
2606 }
2607 if (StoreCachedCode && task->is_precompiled()) {
2608 install_code = false; // not suitable in the current context
2609 }
2610 comp->compile_method(&ci_env, target, osr_bci, install_code, directive);
2611
2612 /* Repeat compilation without installing code for profiling purposes */
2613 int repeat_compilation_count = directive->RepeatCompilationOption;
2614 while (repeat_compilation_count > 0) {
2615 ResourceMark rm(thread);
2616 task->print_ul("NO CODE INSTALLED");
2617 comp->compile_method(&ci_env, target, osr_bci, false, directive);
2618 repeat_compilation_count--;
2619 }
2620 }
2621
2622 DirectivesStack::release(directive);
2623
2624 if (!ci_env.failing() && !task->is_success() && install_code) {
2625 assert(ci_env.failure_reason() != nullptr, "expect failure reason");
2626 assert(false, "compiler should always document failure: %s", ci_env.failure_reason());
2627 // The compiler elected, without comment, not to register a result.
2628 // Do not attempt further compilations of this method.
2629 ci_env.record_method_not_compilable("compile failed");
2630 }
2631
2632 // Copy this bit to the enclosing block:
2633 compilable = ci_env.compilable();
2634
2635 if (ci_env.failing()) {
2636 // Duplicate the failure reason string, so that it outlives ciEnv
2637 failure_reason = os::strdup(ci_env.failure_reason(), mtCompiler);
2638 failure_reason_on_C_heap = true;
2639 retry_message = ci_env.retry_message();
2640 ci_env.report_failure(failure_reason);
2641 }
2642
2643 if (ci_env.failing()) {
2644 handle_compile_error(thread, task, &ci_env, compilable, failure_reason);
2645 }
2646 if (event.should_commit()) {
2647 post_compilation_event(event, task);
2648 }
2649 }
2650
2651 if (failure_reason != nullptr) {
2652 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2653 if (CompilationLog::log() != nullptr) {
2654 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message);
2655 }
2656 if (PrintCompilation) {
2657 FormatBufferResource msg = retry_message != nullptr ?
2658 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2659 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2660 task->print(tty, msg);
2661 }
2662 }
2663
2664 if (tdata != nullptr) {
2665 tdata->record_compilation_end(task);
2666 }
2667
2668 methodHandle method(thread, task->method());
2669
2670 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2671
2672 collect_statistics(thread, time, task);
2673
2674 if (PrintCompilation && PrintCompilation2) {
2675 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2676 tty->print("%4d ", compile_id); // print compilation number
2677 tty->print("%s ", (is_osr ? "%" : (task->is_scc() ? "A" : " ")));
2678 if (task->is_success()) {
2679 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size());
2680 }
2681 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2682 }
2683
2684 Log(compilation, codecache) log;
2685 if (log.is_debug()) {
2686 LogStream ls(log.debug());
2687 codecache_print(&ls, /* detailed= */ false);
2688 }
2689 if (PrintCodeCacheOnCompilation) {
2690 codecache_print(/* detailed= */ false);
2691 }
2692 // Disable compilation, if required.
2693 switch (compilable) {
2694 case ciEnv::MethodCompilable_never:
2695 if (is_osr)
2696 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2697 else
2698 method->set_not_compilable_quietly("MethodCompilable_never");
2699 break;
2700 case ciEnv::MethodCompilable_not_at_tier:
2701 if (is_osr)
2702 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2703 else
2704 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2705 break;
2706 }
2707
2708 // Note that the queued_for_compilation bits are cleared without
2709 // protection of a mutex. [They were set by the requester thread,
2710 // when adding the task to the compile queue -- at which time the
2711 // compile queue lock was held. Subsequently, we acquired the compile
2712 // queue lock to get this task off the compile queue; thus (to belabour
2713 // the point somewhat) our clearing of the bits must be occurring
2714 // only after the setting of the bits. See also 14012000 above.
2715 method->clear_queued_for_compilation();
2716 method->set_pending_queue_processed(false);
2717 }
2718
2719 /**
2720 * The CodeCache is full. Print warning and disable compilation.
2721 * Schedule code cache cleaning so compilation can continue later.
2722 * This function needs to be called only from CodeCache::allocate(),
2723 * since we currently handle a full code cache uniformly.
2724 */
2725 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) {
2726 UseInterpreter = true;
2727 if (UseCompiler || AlwaysCompileLoopMethods ) {
2728 if (xtty != nullptr) {
2729 stringStream s;
2730 // Dump code cache state into a buffer before locking the tty,
2731 // because log_state() will use locks causing lock conflicts.
2732 CodeCache::log_state(&s);
2733 // Lock to prevent tearing
2734 ttyLocker ttyl;
2735 xtty->begin_elem("code_cache_full");
2736 xtty->print("%s", s.freeze());
2737 xtty->stamp();
2738 xtty->end_elem();
2739 }
2740
2741 #ifndef PRODUCT
2742 if (ExitOnFullCodeCache) {
2743 codecache_print(/* detailed= */ true);
2744 before_exit(JavaThread::current());
2745 exit_globals(); // will delete tty
2746 vm_direct_exit(1);
2747 }
2748 #endif
2749 if (UseCodeCacheFlushing) {
2750 // Since code cache is full, immediately stop new compiles
2751 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2752 log_info(codecache)("Code cache is full - disabling compilation");
2753 }
2754 } else {
2755 disable_compilation_forever();
2756 }
2757
2758 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2759 }
2760 }
2761
2762 // ------------------------------------------------------------------
2763 // CompileBroker::update_compile_perf_data
2764 //
2765 // Record this compilation for debugging purposes.
2766 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2767 ResourceMark rm;
2768 char* method_name = method->name()->as_C_string();
2769 char current_method[CompilerCounters::cmname_buffer_length];
2770 size_t maxLen = CompilerCounters::cmname_buffer_length;
2771
2772 const char* class_name = method->method_holder()->name()->as_C_string();
2773
2774 size_t s1len = strlen(class_name);
2775 size_t s2len = strlen(method_name);
2776
2777 // check if we need to truncate the string
2778 if (s1len + s2len + 2 > maxLen) {
2779
2780 // the strategy is to lop off the leading characters of the
2781 // class name and the trailing characters of the method name.
2782
2783 if (s2len + 2 > maxLen) {
2784 // lop of the entire class name string, let snprintf handle
2785 // truncation of the method name.
2786 class_name += s1len; // null string
2787 }
2788 else {
2789 // lop off the extra characters from the front of the class name
2790 class_name += ((s1len + s2len + 2) - maxLen);
2791 }
2792 }
2793
2794 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2795
2796 int last_compile_type = normal_compile;
2797 if (CICountOSR && is_osr) {
2798 last_compile_type = osr_compile;
2799 } else if (CICountNative && method->is_native()) {
2800 last_compile_type = native_compile;
2801 }
2802
2803 CompilerCounters* counters = thread->counters();
2804 counters->set_current_method(current_method);
2805 counters->set_compile_type((jlong) last_compile_type);
2806 }
2807
2808 // ------------------------------------------------------------------
2809 // CompileBroker::collect_statistics
2810 //
2811 // Collect statistics about the compilation.
2812
2813 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2814 bool success = task->is_success();
2815 methodHandle method (thread, task->method());
2816 int compile_id = task->compile_id();
2817 bool is_osr = (task->osr_bci() != standard_entry_bci);
2818 const int comp_level = task->comp_level();
2819 CompilerCounters* counters = thread->counters();
2820
2821 MutexLocker locker(CompileStatistics_lock);
2822
2823 // _perf variables are production performance counters which are
2824 // updated regardless of the setting of the CITime and CITimeEach flags
2825 //
2826
2827 // account all time, including bailouts and failures in this counter;
2828 // C1 and C2 counters are counting both successful and unsuccessful compiles
2829 _t_total_compilation.add(&time);
2830
2831 if (!success) {
2832 _total_bailout_count++;
2833 if (UsePerfData) {
2834 _perf_last_failed_method->set_value(counters->current_method());
2835 _perf_last_failed_type->set_value(counters->compile_type());
2836 _perf_total_bailout_count->inc();
2837 }
2838 _t_bailedout_compilation.add(&time);
2839
2840 if (CITime || log_is_enabled(Info, init)) {
2841 CompilerStatistics* stats = nullptr;
2842 if (task->is_scc()) {
2843 int level = task->preload() ? CompLevel_full_optimization : (comp_level - 1);
2844 stats = &_scc_stats_per_level[level];
2845 } else {
2846 stats = &_stats_per_level[comp_level-1];
2847 }
2848 stats->_bailout.update(time, 0);
2849 }
2850 } else if (!task->is_success()) {
2851 if (UsePerfData) {
2852 _perf_last_invalidated_method->set_value(counters->current_method());
2853 _perf_last_invalidated_type->set_value(counters->compile_type());
2854 _perf_total_invalidated_count->inc();
2855 }
2856 _total_invalidated_count++;
2857 _t_invalidated_compilation.add(&time);
2858
2859 if (CITime || log_is_enabled(Info, init)) {
2860 CompilerStatistics* stats = nullptr;
2861 if (task->is_scc()) {
2862 int level = task->preload() ? CompLevel_full_optimization : (comp_level - 1);
2863 stats = &_scc_stats_per_level[level];
2864 } else {
2865 stats = &_stats_per_level[comp_level-1];
2866 }
2867 stats->_invalidated.update(time, 0);
2868 }
2869 } else {
2870 // Compilation succeeded
2871
2872 // update compilation ticks - used by the implementation of
2873 // java.lang.management.CompilationMXBean
2874 _perf_total_compilation->inc(time.ticks());
2875 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2876
2877 if (CITime || log_is_enabled(Info, init)) {
2878 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2879 if (is_osr) {
2880 _t_osr_compilation.add(&time);
2881 _sum_osr_bytes_compiled += bytes_compiled;
2882 } else {
2883 _t_standard_compilation.add(&time);
2884 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2885 }
2886
2887 // Collect statistic per compilation level
2888 if (task->is_scc()) {
2889 _scc_stats._standard.update(time, bytes_compiled);
2890 _scc_stats._nmethods_size += task->nm_total_size();
2891 _scc_stats._nmethods_code_size += task->nm_insts_size();
2892 int level = task->preload() ? CompLevel_full_optimization : (comp_level - 1);
2893 CompilerStatistics* stats = &_scc_stats_per_level[level];
2894 stats->_standard.update(time, bytes_compiled);
2895 stats->_nmethods_size += task->nm_total_size();
2896 stats->_nmethods_code_size += task->nm_insts_size();
2897 } else if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2898 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2899 if (is_osr) {
2900 stats->_osr.update(time, bytes_compiled);
2901 } else {
2902 stats->_standard.update(time, bytes_compiled);
2903 }
2904 stats->_nmethods_size += task->nm_total_size();
2905 stats->_nmethods_code_size += task->nm_insts_size();
2906 } else {
2907 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2908 }
2909
2910 // Collect statistic per compiler
2911 AbstractCompiler* comp = task->compiler();
2912 if (comp && !task->is_scc()) {
2913 CompilerStatistics* stats = comp->stats();
2914 if (is_osr) {
2915 stats->_osr.update(time, bytes_compiled);
2916 } else {
2917 stats->_standard.update(time, bytes_compiled);
2918 }
2919 stats->_nmethods_size += task->nm_total_size();
2920 stats->_nmethods_code_size += task->nm_insts_size();
2921 } else if (!task->is_scc()) { // if (!comp)
2922 assert(false, "Compiler object must exist");
2923 }
2924 }
2925
2926 if (UsePerfData) {
2927 // save the name of the last method compiled
2928 _perf_last_method->set_value(counters->current_method());
2929 _perf_last_compile_type->set_value(counters->compile_type());
2930 _perf_last_compile_size->set_value(method->code_size() +
2931 task->num_inlined_bytecodes());
2932 if (is_osr) {
2933 _perf_osr_compilation->inc(time.ticks());
2934 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2935 } else {
2936 _perf_standard_compilation->inc(time.ticks());
2937 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2938 }
2939 }
2940
2941 if (CITimeEach) {
2942 double compile_time = time.seconds();
2943 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2944 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2945 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2946 }
2947
2948 // Collect counts of successful compilations
2949 _sum_nmethod_size += task->nm_total_size();
2950 _sum_nmethod_code_size += task->nm_insts_size();
2951 _total_compile_count++;
2952
2953 if (UsePerfData) {
2954 _perf_sum_nmethod_size->inc( task->nm_total_size());
2955 _perf_sum_nmethod_code_size->inc(task->nm_insts_size());
2956 _perf_total_compile_count->inc();
2957 }
2958
2959 if (is_osr) {
2960 if (UsePerfData) _perf_total_osr_compile_count->inc();
2961 _total_osr_compile_count++;
2962 } else {
2963 if (UsePerfData) _perf_total_standard_compile_count->inc();
2964 _total_standard_compile_count++;
2965 }
2966 }
2967 // set the current method for the thread to null
2968 if (UsePerfData) counters->set_current_method("");
2969 }
2970
2971 const char* CompileBroker::compiler_name(int comp_level) {
2972 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2973 if (comp == nullptr) {
2974 return "no compiler";
2975 } else {
2976 return (comp->name());
2977 }
2978 }
2979
2980 jlong CompileBroker::total_compilation_ticks() {
2981 return _perf_total_compilation != nullptr ? _perf_total_compilation->get_value() : 0;
2982 }
2983
2984 void CompileBroker::log_not_entrant(nmethod* nm) {
2985 _total_not_entrant_count++;
2986 if (CITime || log_is_enabled(Info, init)) {
2987 CompilerStatistics* stats = nullptr;
2988 int level = nm->comp_level();
2989 if (nm->is_scc()) {
2990 if (nm->preloaded()) {
2991 assert(level == CompLevel_full_optimization, "%d", level);
2992 level = CompLevel_full_optimization + 1;
2993 }
2994 stats = &_scc_stats_per_level[level - 1];
2995 } else {
2996 stats = &_stats_per_level[level - 1];
2997 }
2998 stats->_made_not_entrant._count++;
2999 }
3000 }
3001
3002 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
3003 tty->print_cr(" %s {speed: %6.3f bytes/s; standard: %6.3f s, %u bytes, %u methods; osr: %6.3f s, %u bytes, %u methods; nmethods_size: %u bytes; nmethods_code_size: %u bytes}",
3004 name, stats->bytes_per_second(),
3005 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
3006 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
3007 stats->_nmethods_size, stats->_nmethods_code_size);
3008 }
3009
3010 static void print_helper(outputStream* st, const char* name, CompilerStatistics::Data data, bool print_time = true) {
3011 if (data._count > 0) {
3012 st->print("; %s: %4u methods", name, data._count);
3013 if (print_time) {
3014 st->print(" (in %.3fs)", data._time.seconds());
3015 }
3016 }
3017 }
3018
3019 static void print_tier_helper(outputStream* st, const char* prefix, int tier, CompilerStatistics* stats) {
3020 st->print(" %s%d: %5u methods", prefix, tier, stats->_standard._count);
3021 if (stats->_standard._count > 0) {
3022 st->print(" (in %.3fs)", stats->_standard._time.seconds());
3023 }
3024 print_helper(st, "osr", stats->_osr);
3025 print_helper(st, "bailout", stats->_bailout);
3026 print_helper(st, "invalid", stats->_invalidated);
3027 print_helper(st, "not_entrant", stats->_made_not_entrant, false);
3028 st->cr();
3029 }
3030
3031 static void print_queue_info(outputStream* st, CompileQueue* queue) {
3032 if (queue != nullptr) {
3033 MutexLocker ml(queue->lock());
3034
3035 uint total_cnt = 0;
3036 uint active_cnt = 0;
3037 for (JavaThread* jt : *ThreadsSMRSupport::get_java_thread_list()) {
3038 guarantee(jt != nullptr, "");
3039 if (jt->is_Compiler_thread()) {
3040 CompilerThread* ct = (CompilerThread*)jt;
3041
3042 guarantee(ct != nullptr, "");
3043 if (ct->queue() == queue) {
3044 ++total_cnt;
3045 CompileTask* task = ct->task();
3046 if (task != nullptr) {
3047 ++active_cnt;
3048 }
3049 }
3050 }
3051 }
3052
3053 st->print(" %s (%d active / %d total threads): %u tasks",
3054 queue->name(), active_cnt, total_cnt, queue->size());
3055 if (queue->size() > 0) {
3056 uint counts[] = {0, 0, 0, 0, 0}; // T1 ... T5
3057 for (CompileTask* task = queue->first(); task != nullptr; task = task->next()) {
3058 int tier = task->comp_level();
3059 if (task->is_scc() && task->preload()) {
3060 assert(tier == CompLevel_full_optimization, "%d", tier);
3061 tier = CompLevel_full_optimization + 1;
3062 }
3063 counts[tier-1]++;
3064 }
3065 st->print(":");
3066 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level() + 1; tier++) {
3067 uint cnt = counts[tier-1];
3068 if (cnt > 0) {
3069 st->print(" T%d: %u tasks;", tier, cnt);
3070 }
3071 }
3072 }
3073 st->cr();
3074
3075 // for (JavaThread* jt : *ThreadsSMRSupport::get_java_thread_list()) {
3076 // guarantee(jt != nullptr, "");
3077 // if (jt->is_Compiler_thread()) {
3078 // CompilerThread* ct = (CompilerThread*)jt;
3079 //
3080 // guarantee(ct != nullptr, "");
3081 // if (ct->queue() == queue) {
3082 // ResourceMark rm;
3083 // CompileTask* task = ct->task();
3084 // st->print(" %s: ", ct->name_raw());
3085 // if (task != nullptr) {
3086 // task->print(st, nullptr, true /*short_form*/, false /*cr*/);
3087 // }
3088 // st->cr();
3089 // }
3090 // }
3091 // }
3092 }
3093 }
3094 void CompileBroker::print_statistics_on(outputStream* st) {
3095 st->print_cr(" Total: %u methods; %u bailouts, %u invalidated, %u non_entrant",
3096 _total_compile_count, _total_bailout_count, _total_invalidated_count, _total_not_entrant_count);
3097 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
3098 print_tier_helper(st, "Tier", tier, &_stats_per_level[tier-1]);
3099 }
3100 st->cr();
3101
3102 if (LoadCachedCode || StoreCachedCode) {
3103 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level() + 1; tier++) {
3104 if (tier != CompLevel_full_profile) {
3105 print_tier_helper(st, "SC T", tier, &_scc_stats_per_level[tier - 1]);
3106 }
3107 }
3108 st->cr();
3109 }
3110
3111 print_queue_info(st, _c1_compile_queue);
3112 print_queue_info(st, _c2_compile_queue);
3113 print_queue_info(st, _c3_compile_queue);
3114 print_queue_info(st, _sc1_compile_queue);
3115 print_queue_info(st, _sc2_compile_queue);
3116 }
3117
3118 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
3119 if (per_compiler) {
3120 if (aggregate) {
3121 tty->cr();
3122 tty->print_cr("[%dms] Individual compiler times (for compiled methods only)", (int)tty->time_stamp().milliseconds());
3123 tty->print_cr("------------------------------------------------");
3124 tty->cr();
3125 }
3126 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
3127 AbstractCompiler* comp = _compilers[i];
3128 if (comp != nullptr) {
3129 print_times(comp->name(), comp->stats());
3130 }
3131 }
3132 if (_scc_stats._standard._count > 0) {
3133 print_times("SC", &_scc_stats);
3134 }
3135 if (aggregate) {
3136 tty->cr();
3137 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
3138 tty->print_cr("------------------------------------------------");
3139 tty->cr();
3140 }
3141 char tier_name[256];
3142 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
3143 CompilerStatistics* stats = &_stats_per_level[tier-1];
3144 os::snprintf_checked(tier_name, sizeof(tier_name), "Tier%d", tier);
3145 print_times(tier_name, stats);
3146 }
3147 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level() + 1; tier++) {
3148 CompilerStatistics* stats = &_scc_stats_per_level[tier-1];
3149 if (stats->_standard._bytes > 0) {
3150 os::snprintf_checked(tier_name, sizeof(tier_name), "SC T%d", tier);
3151 print_times(tier_name, stats);
3152 }
3153 }
3154 }
3155
3156 if (!aggregate) {
3157 return;
3158 }
3159
3160 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
3161 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
3162 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
3163
3164 uint standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
3165 uint osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
3166
3167 uint standard_compile_count = CompileBroker::_total_standard_compile_count;
3168 uint osr_compile_count = CompileBroker::_total_osr_compile_count;
3169 uint total_compile_count = CompileBroker::_total_compile_count;
3170 uint total_bailout_count = CompileBroker::_total_bailout_count;
3171 uint total_invalidated_count = CompileBroker::_total_invalidated_count;
3172
3173 uint nmethods_code_size = CompileBroker::_sum_nmethod_code_size;
3174 uint nmethods_size = CompileBroker::_sum_nmethod_size;
3175
3176 tty->cr();
3177 tty->print_cr("Accumulated compiler times");
3178 tty->print_cr("----------------------------------------------------------");
3179 //0000000000111111111122222222223333333333444444444455555555556666666666
3180 //0123456789012345678901234567890123456789012345678901234567890123456789
3181 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
3182 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
3183 standard_compilation.seconds(),
3184 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
3185 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
3186 CompileBroker::_t_bailedout_compilation.seconds(),
3187 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
3188 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
3189 osr_compilation.seconds(),
3190 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
3191 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
3192 CompileBroker::_t_invalidated_compilation.seconds(),
3193 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
3194
3195 if (StoreCachedCode || LoadCachedCode) { // Check flags because SC cache could be closed already
3196 tty->cr();
3197 SCCache::print_timers_on(tty);
3198 }
3199 AbstractCompiler *comp = compiler(CompLevel_simple);
3200 if (comp != nullptr) {
3201 tty->cr();
3202 comp->print_timers();
3203 }
3204 comp = compiler(CompLevel_full_optimization);
3205 if (comp != nullptr) {
3206 tty->cr();
3207 comp->print_timers();
3208 }
3209 comp = _compilers[2];
3210 if (comp != nullptr) {
3211 tty->cr();
3212 comp->print_timers();
3213 }
3214 #if INCLUDE_JVMCI
3215 if (EnableJVMCI) {
3216 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null());
3217 if (jvmci_comp != nullptr && jvmci_comp != comp) {
3218 tty->cr();
3219 jvmci_comp->print_timers();
3220 }
3221 }
3222 #endif
3223
3224 tty->cr();
3225 tty->print_cr(" Total compiled methods : %8u methods", total_compile_count);
3226 tty->print_cr(" Standard compilation : %8u methods", standard_compile_count);
3227 tty->print_cr(" On stack replacement : %8u methods", osr_compile_count);
3228 uint tcb = osr_bytes_compiled + standard_bytes_compiled;
3229 tty->print_cr(" Total compiled bytecodes : %8u bytes", tcb);
3230 tty->print_cr(" Standard compilation : %8u bytes", standard_bytes_compiled);
3231 tty->print_cr(" On stack replacement : %8u bytes", osr_bytes_compiled);
3232 double tcs = total_compilation.seconds();
3233 uint bps = tcs == 0.0 ? 0 : (uint)(tcb / tcs);
3234 tty->print_cr(" Average compilation speed : %8u bytes/s", bps);
3235 tty->cr();
3236 tty->print_cr(" nmethod code size : %8u bytes", nmethods_code_size);
3237 tty->print_cr(" nmethod total size : %8u bytes", nmethods_size);
3238 }
3239
3240 // Print general/accumulated JIT information.
3241 void CompileBroker::print_info(outputStream *out) {
3242 if (out == nullptr) out = tty;
3243 out->cr();
3244 out->print_cr("======================");
3245 out->print_cr(" General JIT info ");
3246 out->print_cr("======================");
3247 out->cr();
3248 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
3249 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
3250 out->cr();
3251 out->print_cr("CodeCache overview");
3252 out->print_cr("--------------------------------------------------------");
3253 out->cr();
3254 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
3255 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
3256 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
3257 out->cr();
3258 }
3259
3260 // Note: tty_lock must not be held upon entry to this function.
3261 // Print functions called from herein do "micro-locking" on tty_lock.
3262 // That's a tradeoff which keeps together important blocks of output.
3263 // At the same time, continuous tty_lock hold time is kept in check,
3264 // preventing concurrently printing threads from stalling a long time.
3265 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
3266 TimeStamp ts_total;
3267 TimeStamp ts_global;
3268 TimeStamp ts;
3269
3270 bool allFun = !strcmp(function, "all");
3271 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
3272 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
3273 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
3274 bool methodCount = !strcmp(function, "MethodCount") || allFun;
3275 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
3276 bool methodAge = !strcmp(function, "MethodAge") || allFun;
3277 bool methodNames = !strcmp(function, "MethodNames") || allFun;
3278 bool discard = !strcmp(function, "discard") || allFun;
3279
3280 if (out == nullptr) {
3281 out = tty;
3282 }
3283
3284 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
3285 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
3286 out->cr();
3287 return;
3288 }
3289
3290 ts_total.update(); // record starting point
3291
3292 if (aggregate) {
3293 print_info(out);
3294 }
3295
3296 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
3297 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
3298 // When we request individual parts of the analysis via the jcmd interface, it is possible
3299 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
3300 // updated the aggregated data. We will then see a modified, but again consistent, view
3301 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
3302 // a lock across user interaction.
3303
3304 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
3305 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
3306 // leading to an unnecessarily long hold time of the other locks we acquired before.
3307 ts.update(); // record starting point
3308 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
3309 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
3310
3311 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
3312 // Unfortunately, such protection is not sufficient:
3313 // When a new nmethod is created via ciEnv::register_method(), the
3314 // Compile_lock is taken first. After some initializations,
3315 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
3316 // immediately (after finalizing the oop references). To lock out concurrent
3317 // modifiers, we have to grab both locks as well in the described sequence.
3318 //
3319 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
3320 // for the entire duration of aggregation and printing. That makes sure we see
3321 // a consistent picture and do not run into issues caused by concurrent alterations.
3322 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
3323 !Compile_lock->owned_by_self();
3324 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
3325 !CodeCache_lock->owned_by_self();
3326 bool take_global_lock_1 = allFun && should_take_Compile_lock;
3327 bool take_global_lock_2 = allFun && should_take_CodeCache_lock;
3328 bool take_function_lock_1 = !allFun && should_take_Compile_lock;
3329 bool take_function_lock_2 = !allFun && should_take_CodeCache_lock;
3330 bool take_global_locks = take_global_lock_1 || take_global_lock_2;
3331 bool take_function_locks = take_function_lock_1 || take_function_lock_2;
3332
3333 ts_global.update(); // record starting point
3334
3335 ConditionalMutexLocker mu1(Compile_lock, take_global_lock_1, Mutex::_safepoint_check_flag);
3336 ConditionalMutexLocker mu2(CodeCache_lock, take_global_lock_2, Mutex::_no_safepoint_check_flag);
3337 if (take_global_locks) {
3338 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
3339 ts_global.update(); // record starting point
3340 }
3341
3342 if (aggregate) {
3343 ts.update(); // record starting point
3344 ConditionalMutexLocker mu11(Compile_lock, take_function_lock_1, Mutex::_safepoint_check_flag);
3345 ConditionalMutexLocker mu22(CodeCache_lock, take_function_lock_2, Mutex::_no_safepoint_check_flag);
3346 if (take_function_locks) {
3347 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
3348 }
3349
3350 ts.update(); // record starting point
3351 CodeCache::aggregate(out, granularity);
3352 if (take_function_locks) {
3353 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
3354 }
3355 }
3356
3357 if (usedSpace) CodeCache::print_usedSpace(out);
3358 if (freeSpace) CodeCache::print_freeSpace(out);
3359 if (methodCount) CodeCache::print_count(out);
3360 if (methodSpace) CodeCache::print_space(out);
3361 if (methodAge) CodeCache::print_age(out);
3362 if (methodNames) {
3363 if (allFun) {
3364 // print_names() can only be used safely if the locks have been continuously held
3365 // since aggregation begin. That is true only for function "all".
3366 CodeCache::print_names(out);
3367 } else {
3368 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
3369 }
3370 }
3371 if (discard) CodeCache::discard(out);
3372
3373 if (take_global_locks) {
3374 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
3375 }
3376 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
3377 }