1 /*
2 * Copyright (c) 1999, 2025, 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 "cds/cdsConfig.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/symbolTable.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/codeHeapState.hpp"
32 #include "code/dependencyContext.hpp"
33 #include "compiler/compilationLog.hpp"
34 #include "compiler/compilationMemoryStatistic.hpp"
35 #include "compiler/compilationPolicy.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerEvent.hpp"
39 #include "compiler/compilerOracle.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "gc/shared/memAllocator.hpp"
42 #include "interpreter/linkResolver.hpp"
43 #include "jfr/jfrEvents.hpp"
44 #include "jvm.h"
45 #include "logging/log.hpp"
46 #include "logging/logStream.hpp"
47 #include "memory/allocation.inline.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/method.inline.hpp"
51 #include "oops/methodData.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "prims/jvmtiExport.hpp"
54 #include "prims/nativeLookup.hpp"
55 #include "prims/whitebox.hpp"
56 #include "runtime/atomic.hpp"
57 #include "runtime/escapeBarrier.hpp"
58 #include "runtime/globals_extension.hpp"
59 #include "runtime/handles.inline.hpp"
60 #include "runtime/init.hpp"
61 #include "runtime/interfaceSupport.inline.hpp"
62 #include "runtime/java.hpp"
63 #include "runtime/javaCalls.hpp"
64 #include "runtime/jniHandles.inline.hpp"
65 #include "runtime/os.hpp"
66 #include "runtime/perfData.hpp"
67 #include "runtime/safepointVerifiers.hpp"
68 #include "runtime/sharedRuntime.hpp"
69 #include "runtime/threads.hpp"
70 #include "runtime/threadSMR.hpp"
71 #include "runtime/timerTrace.hpp"
72 #include "runtime/vframe.inline.hpp"
73 #include "utilities/debug.hpp"
74 #include "utilities/dtrace.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/formatBuffer.hpp"
77 #include "utilities/macros.hpp"
78 #ifdef COMPILER1
79 #include "c1/c1_Compiler.hpp"
80 #endif
81 #ifdef COMPILER2
82 #include "opto/c2compiler.hpp"
83 #endif
84 #if INCLUDE_JVMCI
85 #include "jvmci/jvmciEnv.hpp"
86 #include "jvmci/jvmciRuntime.hpp"
87 #endif
88
89 #ifdef DTRACE_ENABLED
90
91 // Only bother with this argument setup if dtrace is available
92
93 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
94 { \
95 Symbol* klass_name = (method)->klass_name(); \
96 Symbol* name = (method)->name(); \
97 Symbol* signature = (method)->signature(); \
98 HOTSPOT_METHOD_COMPILE_BEGIN( \
99 (char *) comp_name, strlen(comp_name), \
100 (char *) klass_name->bytes(), klass_name->utf8_length(), \
101 (char *) name->bytes(), name->utf8_length(), \
102 (char *) signature->bytes(), signature->utf8_length()); \
103 }
104
105 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
106 { \
107 Symbol* klass_name = (method)->klass_name(); \
108 Symbol* name = (method)->name(); \
109 Symbol* signature = (method)->signature(); \
110 HOTSPOT_METHOD_COMPILE_END( \
111 (char *) comp_name, strlen(comp_name), \
112 (char *) klass_name->bytes(), klass_name->utf8_length(), \
113 (char *) name->bytes(), name->utf8_length(), \
114 (char *) signature->bytes(), signature->utf8_length(), (success)); \
115 }
116
117 #else // ndef DTRACE_ENABLED
118
119 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
120 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
121
122 #endif // ndef DTRACE_ENABLED
123
124 bool CompileBroker::_initialized = false;
125 volatile bool CompileBroker::_should_block = false;
126 volatile int CompileBroker::_print_compilation_warning = 0;
127 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
128
129 // The installed compiler(s)
130 AbstractCompiler* CompileBroker::_compilers[2];
131
132 // The maximum numbers of compiler threads to be determined during startup.
133 int CompileBroker::_c1_count = 0;
134 int CompileBroker::_c2_count = 0;
135
136 // An array of compiler names as Java String objects
137 jobject* CompileBroker::_compiler1_objects = nullptr;
138 jobject* CompileBroker::_compiler2_objects = nullptr;
139
140 CompileLog** CompileBroker::_compiler1_logs = nullptr;
141 CompileLog** CompileBroker::_compiler2_logs = nullptr;
142
143 // These counters are used to assign an unique ID to each compilation.
144 volatile jint CompileBroker::_compilation_id = 0;
145 volatile jint CompileBroker::_osr_compilation_id = 0;
146 volatile jint CompileBroker::_native_compilation_id = 0;
147
148 // Performance counters
149 PerfCounter* CompileBroker::_perf_total_compilation = nullptr;
150 PerfCounter* CompileBroker::_perf_osr_compilation = nullptr;
151 PerfCounter* CompileBroker::_perf_standard_compilation = nullptr;
152
153 PerfCounter* CompileBroker::_perf_total_bailout_count = nullptr;
154 PerfCounter* CompileBroker::_perf_total_invalidated_count = nullptr;
155 PerfCounter* CompileBroker::_perf_total_compile_count = nullptr;
156 PerfCounter* CompileBroker::_perf_total_osr_compile_count = nullptr;
157 PerfCounter* CompileBroker::_perf_total_standard_compile_count = nullptr;
158
159 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = nullptr;
160 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = nullptr;
161 PerfCounter* CompileBroker::_perf_sum_nmethod_size = nullptr;
162 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = nullptr;
163
164 PerfStringVariable* CompileBroker::_perf_last_method = nullptr;
165 PerfStringVariable* CompileBroker::_perf_last_failed_method = nullptr;
166 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = nullptr;
167 PerfVariable* CompileBroker::_perf_last_compile_type = nullptr;
168 PerfVariable* CompileBroker::_perf_last_compile_size = nullptr;
169 PerfVariable* CompileBroker::_perf_last_failed_type = nullptr;
170 PerfVariable* CompileBroker::_perf_last_invalidated_type = nullptr;
171
172 // Timers and counters for generating statistics
173 elapsedTimer CompileBroker::_t_total_compilation;
174 elapsedTimer CompileBroker::_t_osr_compilation;
175 elapsedTimer CompileBroker::_t_standard_compilation;
176 elapsedTimer CompileBroker::_t_invalidated_compilation;
177 elapsedTimer CompileBroker::_t_bailedout_compilation;
178
179 uint CompileBroker::_total_bailout_count = 0;
180 uint CompileBroker::_total_invalidated_count = 0;
181 uint CompileBroker::_total_compile_count = 0;
182 uint CompileBroker::_total_osr_compile_count = 0;
183 uint CompileBroker::_total_standard_compile_count = 0;
184 uint CompileBroker::_total_compiler_stopped_count = 0;
185 uint CompileBroker::_total_compiler_restarted_count = 0;
186
187 uint CompileBroker::_sum_osr_bytes_compiled = 0;
188 uint CompileBroker::_sum_standard_bytes_compiled = 0;
189 uint CompileBroker::_sum_nmethod_size = 0;
190 uint CompileBroker::_sum_nmethod_code_size = 0;
191
192 jlong CompileBroker::_peak_compilation_time = 0;
193
194 CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization];
195
196 CompileQueue* CompileBroker::_c2_compile_queue = nullptr;
197 CompileQueue* CompileBroker::_c1_compile_queue = nullptr;
198
199 bool compileBroker_init() {
200 if (LogEvents) {
201 CompilationLog::init();
202 }
203
204 // init directives stack, adding default directive
205 DirectivesStack::init();
206
207 if (DirectivesParser::has_file()) {
208 return DirectivesParser::parse_from_flag();
209 } else if (CompilerDirectivesPrint) {
210 // Print default directive even when no other was added
211 DirectivesStack::print(tty);
212 }
213
214 return true;
215 }
216
217 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
218 CompilerThread* thread = CompilerThread::current();
219 thread->set_task(task);
220 CompileLog* log = thread->log();
221 if (log != nullptr && !task->is_unloaded()) task->log_task_start(log);
222 }
223
224 CompileTaskWrapper::~CompileTaskWrapper() {
225 CompilerThread* thread = CompilerThread::current();
226 CompileTask* task = thread->task();
227 CompileLog* log = thread->log();
228 if (log != nullptr && !task->is_unloaded()) task->log_task_done(log);
229 thread->set_task(nullptr);
230 thread->set_env(nullptr);
231 if (task->is_blocking()) {
232 bool free_task = false;
233 {
234 MutexLocker notifier(thread, task->lock());
235 task->mark_complete();
236 #if INCLUDE_JVMCI
237 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
238 if (!task->has_waiter()) {
239 // The waiting thread timed out and thus did not free the task.
240 free_task = true;
241 }
242 task->set_blocking_jvmci_compile_state(nullptr);
243 }
244 #endif
245 if (!free_task) {
246 // Notify the waiting thread that the compilation has completed
247 // so that it can free the task.
248 task->lock()->notify_all();
249 }
250 }
251 if (free_task) {
252 // The task can only be freed once the task lock is released.
253 CompileTask::free(task);
254 }
255 } else {
256 task->mark_complete();
257
258 // By convention, the compiling thread is responsible for
259 // recycling a non-blocking CompileTask.
260 CompileTask::free(task);
261 }
262 }
263
264 /**
265 * Check if a CompilerThread can be removed and update count if requested.
266 */
267 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
268 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
269 if (!ReduceNumberOfCompilerThreads) return false;
270
271 AbstractCompiler *compiler = ct->compiler();
272 int compiler_count = compiler->num_compiler_threads();
273 bool c1 = compiler->is_c1();
274
275 // Keep at least 1 compiler thread of each type.
276 if (compiler_count < 2) return false;
277
278 // Keep thread alive for at least some time.
279 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
280
281 #if INCLUDE_JVMCI
282 if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
283 // Handles for JVMCI thread objects may get released concurrently.
284 if (do_it) {
285 assert(CompileThread_lock->owner() == ct, "must be holding lock");
286 } else {
287 // Skip check if it's the last thread and let caller check again.
288 return true;
289 }
290 }
291 #endif
292
293 // We only allow the last compiler thread of each type to get removed.
294 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
295 : compiler2_object(compiler_count - 1);
296 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
297 if (do_it) {
298 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
299 compiler->set_num_compiler_threads(compiler_count - 1);
300 #if INCLUDE_JVMCI
301 if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
302 // Old j.l.Thread object can die when no longer referenced elsewhere.
303 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
304 _compiler2_objects[compiler_count - 1] = nullptr;
305 }
306 #endif
307 }
308 return true;
309 }
310 return false;
311 }
312
313 /**
314 * Add a CompileTask to a CompileQueue.
315 */
316 void CompileQueue::add(CompileTask* task) {
317 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
318
319 task->set_next(nullptr);
320 task->set_prev(nullptr);
321
322 if (_last == nullptr) {
323 // The compile queue is empty.
324 assert(_first == nullptr, "queue is empty");
325 _first = task;
326 _last = task;
327 } else {
328 // Append the task to the queue.
329 assert(_last->next() == nullptr, "not last");
330 _last->set_next(task);
331 task->set_prev(_last);
332 _last = task;
333 }
334 ++_size;
335 ++_total_added;
336 if (_size > _peak_size) {
337 _peak_size = _size;
338 }
339
340 // Mark the method as being in the compile queue.
341 task->method()->set_queued_for_compilation();
342
343 if (CIPrintCompileQueue) {
344 print_tty();
345 }
346
347 if (LogCompilation && xtty != nullptr) {
348 task->log_task_queued();
349 }
350
351 if (TrainingData::need_data() && !CDSConfig::is_dumping_final_static_archive()) {
352 CompileTrainingData* ctd = CompileTrainingData::make(task);
353 if (ctd != nullptr) {
354 task->set_training_data(ctd);
355 }
356 }
357
358 // Notify CompilerThreads that a task is available.
359 MethodCompileQueue_lock->notify_all();
360 }
361
362 /**
363 * Empties compilation queue by putting all compilation tasks onto
364 * a freelist. Furthermore, the method wakes up all threads that are
365 * waiting on a compilation task to finish. This can happen if background
366 * compilation is disabled.
367 */
368 void CompileQueue::free_all() {
369 MutexLocker mu(MethodCompileQueue_lock);
370 CompileTask* next = _first;
371
372 // Iterate over all tasks in the compile queue
373 while (next != nullptr) {
374 CompileTask* current = next;
375 next = current->next();
376 bool found_waiter = false;
377 {
378 MutexLocker ct_lock(current->lock());
379 assert(current->waiting_for_completion_count() <= 1, "more than one thread are waiting for task");
380 if (current->waiting_for_completion_count() > 0) {
381 // If another thread waits for this task, we must wake them up
382 // so they will stop waiting and free the task.
383 current->lock()->notify();
384 found_waiter = true;
385 }
386 }
387 if (!found_waiter) {
388 // If no one was waiting for this task, we need to free it ourselves. In this case, the task
389 // is also certainly unlocked, because, again, there is no waiter.
390 // Otherwise, by convention, it's the waiters responsibility to free the task.
391 // Put the task back on the freelist.
392 CompileTask::free(current);
393 }
394 }
395 _first = nullptr;
396 _last = nullptr;
397
398 // Wake up all threads that block on the queue.
399 MethodCompileQueue_lock->notify_all();
400 }
401
402 /**
403 * Get the next CompileTask from a CompileQueue
404 */
405 CompileTask* CompileQueue::get(CompilerThread* thread) {
406 // save methods from RedefineClasses across safepoint
407 // across MethodCompileQueue_lock below.
408 methodHandle save_method;
409
410 MonitorLocker locker(MethodCompileQueue_lock);
411 // If _first is null we have no more compile jobs. There are two reasons for
412 // having no compile jobs: First, we compiled everything we wanted. Second,
413 // we ran out of code cache so compilation has been disabled. In the latter
414 // case we perform code cache sweeps to free memory such that we can re-enable
415 // compilation.
416 while (_first == nullptr) {
417 // Exit loop if compilation is disabled forever
418 if (CompileBroker::is_compilation_disabled_forever()) {
419 return nullptr;
420 }
421
422 AbstractCompiler* compiler = thread->compiler();
423 guarantee(compiler != nullptr, "Compiler object must exist");
424 compiler->on_empty_queue(this, thread);
425 if (_first != nullptr) {
426 // The call to on_empty_queue may have temporarily unlocked the MCQ lock
427 // so check again whether any tasks were added to the queue.
428 break;
429 }
430
431 // If there are no compilation tasks and we can compile new jobs
432 // (i.e., there is enough free space in the code cache) there is
433 // no need to invoke the GC.
434 // We need a timed wait here, since compiler threads can exit if compilation
435 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
436 // is not critical and we do not want idle compiler threads to wake up too often.
437 locker.wait(5*1000);
438
439 if (UseDynamicNumberOfCompilerThreads && _first == nullptr) {
440 // Still nothing to compile. Give caller a chance to stop this thread.
441 if (CompileBroker::can_remove(CompilerThread::current(), false)) return nullptr;
442 }
443 }
444
445 if (CompileBroker::is_compilation_disabled_forever()) {
446 return nullptr;
447 }
448
449 CompileTask* task;
450 {
451 NoSafepointVerifier nsv;
452 task = CompilationPolicy::select_task(this, thread);
453 if (task != nullptr) {
454 task = task->select_for_compilation();
455 }
456 }
457
458 if (task != nullptr) {
459 // Save method pointers across unlock safepoint. The task is removed from
460 // the compilation queue, which is walked during RedefineClasses.
461 Thread* thread = Thread::current();
462 save_method = methodHandle(thread, task->method());
463
464 remove(task);
465 }
466 purge_stale_tasks(); // may temporarily release MCQ lock
467 return task;
468 }
469
470 // Clean & deallocate stale compile tasks.
471 // Temporarily releases MethodCompileQueue lock.
472 void CompileQueue::purge_stale_tasks() {
473 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
474 if (_first_stale != nullptr) {
475 // Stale tasks are purged when MCQ lock is released,
476 // but _first_stale updates are protected by MCQ lock.
477 // Once task processing starts and MCQ lock is released,
478 // other compiler threads can reuse _first_stale.
479 CompileTask* head = _first_stale;
480 _first_stale = nullptr;
481 {
482 MutexUnlocker ul(MethodCompileQueue_lock);
483 for (CompileTask* task = head; task != nullptr; ) {
484 CompileTask* next_task = task->next();
485 CompileTaskWrapper ctw(task); // Frees the task
486 task->set_failure_reason("stale task");
487 task = next_task;
488 }
489 }
490 }
491 }
492
493 void CompileQueue::remove(CompileTask* task) {
494 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
495 if (task->prev() != nullptr) {
496 task->prev()->set_next(task->next());
497 } else {
498 // max is the first element
499 assert(task == _first, "Sanity");
500 _first = task->next();
501 }
502
503 if (task->next() != nullptr) {
504 task->next()->set_prev(task->prev());
505 } else {
506 // max is the last element
507 assert(task == _last, "Sanity");
508 _last = task->prev();
509 }
510 --_size;
511 ++_total_removed;
512 }
513
514 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
515 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
516 remove(task);
517
518 // Enqueue the task for reclamation (should be done outside MCQ lock)
519 task->set_next(_first_stale);
520 task->set_prev(nullptr);
521 _first_stale = task;
522 }
523
524 // methods in the compile queue need to be marked as used on the stack
525 // so that they don't get reclaimed by Redefine Classes
526 void CompileQueue::mark_on_stack() {
527 CompileTask* task = _first;
528 while (task != nullptr) {
529 task->mark_on_stack();
530 task = task->next();
531 }
532 }
533
534
535 CompileQueue* CompileBroker::compile_queue(int comp_level) {
536 if (is_c2_compile(comp_level)) return _c2_compile_queue;
537 if (is_c1_compile(comp_level)) return _c1_compile_queue;
538 return nullptr;
539 }
540
541 CompileQueue* CompileBroker::c1_compile_queue() {
542 return _c1_compile_queue;
543 }
544
545 CompileQueue* CompileBroker::c2_compile_queue() {
546 return _c2_compile_queue;
547 }
548
549 void CompileBroker::print_compile_queues(outputStream* st) {
550 st->print_cr("Current compiles: ");
551
552 char buf[2000];
553 int buflen = sizeof(buf);
554 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
555
556 st->cr();
557 if (_c1_compile_queue != nullptr) {
558 _c1_compile_queue->print(st);
559 }
560 if (_c2_compile_queue != nullptr) {
561 _c2_compile_queue->print(st);
562 }
563 }
564
565 void CompileQueue::print(outputStream* st) {
566 assert_locked_or_safepoint(MethodCompileQueue_lock);
567 st->print_cr("%s:", name());
568 CompileTask* task = _first;
569 if (task == nullptr) {
570 st->print_cr("Empty");
571 } else {
572 while (task != nullptr) {
573 task->print(st, nullptr, true, true);
574 task = task->next();
575 }
576 }
577 st->cr();
578 }
579
580 void CompileQueue::print_tty() {
581 stringStream ss;
582 // Dump the compile queue into a buffer before locking the tty
583 print(&ss);
584 {
585 ttyLocker ttyl;
586 tty->print("%s", ss.freeze());
587 }
588 }
589
590 CompilerCounters::CompilerCounters() {
591 _current_method[0] = '\0';
592 _compile_type = CompileBroker::no_compile;
593 }
594
595 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
596 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
597 // in compiler/compilerEvent.cpp) and registers it with its serializer.
598 //
599 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
600 // so if c2 is used, it should be always registered first.
601 // This function is called during vm initialization.
602 static void register_jfr_phasetype_serializer(CompilerType compiler_type) {
603 ResourceMark rm;
604 static bool first_registration = true;
605 if (compiler_type == compiler_jvmci) {
606 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
607 first_registration = false;
608 #ifdef COMPILER2
609 } else if (compiler_type == compiler_c2) {
610 assert(first_registration, "invariant"); // c2 must be registered first.
611 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
612 const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i);
613 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
614 }
615 first_registration = false;
616 #endif // COMPILER2
617 }
618 }
619 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
620
621 // ------------------------------------------------------------------
622 // CompileBroker::compilation_init
623 //
624 // Initialize the Compilation object
625 void CompileBroker::compilation_init(JavaThread* THREAD) {
626 // No need to initialize compilation system if we do not use it.
627 if (!UseCompiler) {
628 return;
629 }
630 // Set the interface to the current compiler(s).
631 _c1_count = CompilationPolicy::c1_count();
632 _c2_count = CompilationPolicy::c2_count();
633
634 #if INCLUDE_JVMCI
635 if (EnableJVMCI) {
636 // This is creating a JVMCICompiler singleton.
637 JVMCICompiler* jvmci = new JVMCICompiler();
638
639 if (UseJVMCICompiler) {
640 _compilers[1] = jvmci;
641 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
642 if (BootstrapJVMCI) {
643 // JVMCI will bootstrap so give it more threads
644 _c2_count = MIN2(32, os::active_processor_count());
645 }
646 } else {
647 _c2_count = JVMCIThreads;
648 }
649 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
650 } else {
651 #ifdef COMPILER1
652 _c1_count = JVMCIHostThreads;
653 #endif // COMPILER1
654 }
655 }
656 }
657 #endif // INCLUDE_JVMCI
658
659 #ifdef COMPILER1
660 if (_c1_count > 0) {
661 _compilers[0] = new Compiler();
662 }
663 #endif // COMPILER1
664
665 #ifdef COMPILER2
666 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
667 if (_c2_count > 0) {
668 _compilers[1] = new C2Compiler();
669 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
670 // idToPhase mapping for c2 is in opto/phasetype.hpp
671 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
672 }
673 }
674 #endif // COMPILER2
675
676 #if INCLUDE_JVMCI
677 // Register after c2 registration.
678 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
679 if (EnableJVMCI) {
680 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
681 }
682 #endif // INCLUDE_JVMCI
683
684 if (CompilerOracle::should_collect_memstat()) {
685 CompilationMemoryStatistic::initialize();
686 }
687
688 // Start the compiler thread(s)
689 init_compiler_threads();
690 // totalTime performance counter is always created as it is required
691 // by the implementation of java.lang.management.CompilationMXBean.
692 {
693 // Ensure OOM leads to vm_exit_during_initialization.
694 EXCEPTION_MARK;
695 _perf_total_compilation =
696 PerfDataManager::create_counter(JAVA_CI, "totalTime",
697 PerfData::U_Ticks, CHECK);
698 }
699
700 if (UsePerfData) {
701
702 EXCEPTION_MARK;
703
704 // create the jvmstat performance counters
705 _perf_osr_compilation =
706 PerfDataManager::create_counter(SUN_CI, "osrTime",
707 PerfData::U_Ticks, CHECK);
708
709 _perf_standard_compilation =
710 PerfDataManager::create_counter(SUN_CI, "standardTime",
711 PerfData::U_Ticks, CHECK);
712
713 _perf_total_bailout_count =
714 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
715 PerfData::U_Events, CHECK);
716
717 _perf_total_invalidated_count =
718 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
719 PerfData::U_Events, CHECK);
720
721 _perf_total_compile_count =
722 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
723 PerfData::U_Events, CHECK);
724 _perf_total_osr_compile_count =
725 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
726 PerfData::U_Events, CHECK);
727
728 _perf_total_standard_compile_count =
729 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
730 PerfData::U_Events, CHECK);
731
732 _perf_sum_osr_bytes_compiled =
733 PerfDataManager::create_counter(SUN_CI, "osrBytes",
734 PerfData::U_Bytes, CHECK);
735
736 _perf_sum_standard_bytes_compiled =
737 PerfDataManager::create_counter(SUN_CI, "standardBytes",
738 PerfData::U_Bytes, CHECK);
739
740 _perf_sum_nmethod_size =
741 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
742 PerfData::U_Bytes, CHECK);
743
744 _perf_sum_nmethod_code_size =
745 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
746 PerfData::U_Bytes, CHECK);
747
748 _perf_last_method =
749 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
750 CompilerCounters::cmname_buffer_length,
751 "", CHECK);
752
753 _perf_last_failed_method =
754 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
755 CompilerCounters::cmname_buffer_length,
756 "", CHECK);
757
758 _perf_last_invalidated_method =
759 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
760 CompilerCounters::cmname_buffer_length,
761 "", CHECK);
762
763 _perf_last_compile_type =
764 PerfDataManager::create_variable(SUN_CI, "lastType",
765 PerfData::U_None,
766 (jlong)CompileBroker::no_compile,
767 CHECK);
768
769 _perf_last_compile_size =
770 PerfDataManager::create_variable(SUN_CI, "lastSize",
771 PerfData::U_Bytes,
772 (jlong)CompileBroker::no_compile,
773 CHECK);
774
775
776 _perf_last_failed_type =
777 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
778 PerfData::U_None,
779 (jlong)CompileBroker::no_compile,
780 CHECK);
781
782 _perf_last_invalidated_type =
783 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
784 PerfData::U_None,
785 (jlong)CompileBroker::no_compile,
786 CHECK);
787 }
788
789 _initialized = true;
790 }
791
792 void TrainingReplayThread::training_replay_thread_entry(JavaThread* thread, TRAPS) {
793 CompilationPolicy::replay_training_at_init_loop(thread);
794 }
795
796 #if defined(ASSERT) && COMPILER2_OR_JVMCI
797 // Entry for DeoptimizeObjectsALotThread. The threads are started in
798 // CompileBroker::init_compiler_threads() iff DeoptimizeObjectsALot is enabled
799 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
800 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
801 bool enter_single_loop;
802 {
803 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
804 static int single_thread_count = 0;
805 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
806 }
807 if (enter_single_loop) {
808 dt->deoptimize_objects_alot_loop_single();
809 } else {
810 dt->deoptimize_objects_alot_loop_all();
811 }
812 }
813
814 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
815 // barrier targets a single thread which is selected round robin.
816 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
817 HandleMark hm(this);
818 while (true) {
819 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
820 { // Begin new scope for escape barrier
821 HandleMarkCleaner hmc(this);
822 ResourceMark rm(this);
823 EscapeBarrier eb(true, this, deoptee_thread);
824 eb.deoptimize_objects(100);
825 }
826 // Now sleep after the escape barriers destructor resumed deoptee_thread.
827 sleep(DeoptimizeObjectsALotInterval);
828 }
829 }
830 }
831
832 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
833 // barrier targets all java threads in the vm at once.
834 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
835 HandleMark hm(this);
836 while (true) {
837 { // Begin new scope for escape barrier
838 HandleMarkCleaner hmc(this);
839 ResourceMark rm(this);
840 EscapeBarrier eb(true, this);
841 eb.deoptimize_objects_all_threads();
842 }
843 // Now sleep after the escape barriers destructor resumed the java threads.
844 sleep(DeoptimizeObjectsALotInterval);
845 }
846 }
847 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
848
849
850 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
851 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
852
853 if (java_lang_Thread::thread(thread_oop()) != nullptr) {
854 assert(type == compiler_t, "should only happen with reused compiler threads");
855 // The compiler thread hasn't actually exited yet so don't try to reuse it
856 return nullptr;
857 }
858
859 JavaThread* new_thread = nullptr;
860 switch (type) {
861 case compiler_t:
862 assert(comp != nullptr, "Compiler instance missing.");
863 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
864 CompilerCounters* counters = new CompilerCounters();
865 new_thread = new CompilerThread(queue, counters);
866 }
867 break;
868 #if defined(ASSERT) && COMPILER2_OR_JVMCI
869 case deoptimizer_t:
870 new_thread = new DeoptimizeObjectsALotThread();
871 break;
872 #endif // ASSERT
873 case training_replay_t:
874 new_thread = new TrainingReplayThread();
875 break;
876 default:
877 ShouldNotReachHere();
878 }
879
880 // At this point the new CompilerThread data-races with this startup
881 // thread (which is the main thread and NOT the VM thread).
882 // This means Java bytecodes being executed at startup can
883 // queue compile jobs which will run at whatever default priority the
884 // newly created CompilerThread runs at.
885
886
887 // At this point it may be possible that no osthread was created for the
888 // JavaThread due to lack of resources. We will handle that failure below.
889 // Also check new_thread so that static analysis is happy.
890 if (new_thread != nullptr && new_thread->osthread() != nullptr) {
891
892 if (type == compiler_t) {
893 CompilerThread::cast(new_thread)->set_compiler(comp);
894 }
895
896 // Note that we cannot call os::set_priority because it expects Java
897 // priorities and we are *explicitly* using OS priorities so that it's
898 // possible to set the compiler thread priority higher than any Java
899 // thread.
900
901 int native_prio = CompilerThreadPriority;
902 if (native_prio == -1) {
903 if (UseCriticalCompilerThreadPriority) {
904 native_prio = os::java_to_os_priority[CriticalPriority];
905 } else {
906 native_prio = os::java_to_os_priority[NearMaxPriority];
907 }
908 }
909 os::set_native_priority(new_thread, native_prio);
910
911 // Note that this only sets the JavaThread _priority field, which by
912 // definition is limited to Java priorities and not OS priorities.
913 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
914
915 } else { // osthread initialization failure
916 if (UseDynamicNumberOfCompilerThreads && type == compiler_t
917 && comp->num_compiler_threads() > 0) {
918 // The new thread is not known to Thread-SMR yet so we can just delete.
919 delete new_thread;
920 return nullptr;
921 } else {
922 vm_exit_during_initialization("java.lang.OutOfMemoryError",
923 os::native_thread_creation_failed_msg());
924 }
925 }
926
927 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
928
929 return new_thread;
930 }
931
932 static bool trace_compiler_threads() {
933 LogTarget(Debug, jit, thread) lt;
934 return TraceCompilerThreads || lt.is_enabled();
935 }
936
937 static jobject create_compiler_thread(AbstractCompiler* compiler, int i, TRAPS) {
938 char name_buffer[256];
939 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", compiler->name(), i);
940 Handle thread_oop = JavaThread::create_system_thread_object(name_buffer, CHECK_NULL);
941 return JNIHandles::make_global(thread_oop);
942 }
943
944 static void print_compiler_threads(stringStream& msg) {
945 if (TraceCompilerThreads) {
946 tty->print_cr("%7d %s", (int)tty->time_stamp().milliseconds(), msg.as_string());
947 }
948 LogTarget(Debug, jit, thread) lt;
949 if (lt.is_enabled()) {
950 LogStream ls(lt);
951 ls.print_cr("%s", msg.as_string());
952 }
953 }
954
955 void CompileBroker::init_compiler_threads() {
956 // Ensure any exceptions lead to vm_exit_during_initialization.
957 EXCEPTION_MARK;
958 #if !defined(ZERO)
959 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
960 #endif // !ZERO
961 // Initialize the compilation queue
962 if (_c2_count > 0) {
963 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
964 _c2_compile_queue = new CompileQueue(name);
965 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
966 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
967 }
968 if (_c1_count > 0) {
969 _c1_compile_queue = new CompileQueue("C1 compile queue");
970 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
971 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
972 }
973
974 for (int i = 0; i < _c2_count; i++) {
975 // Create a name for our thread.
976 jobject thread_handle = create_compiler_thread(_compilers[1], i, CHECK);
977 _compiler2_objects[i] = thread_handle;
978 _compiler2_logs[i] = nullptr;
979
980 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
981 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
982 assert(ct != nullptr, "should have been handled for initial thread");
983 _compilers[1]->set_num_compiler_threads(i + 1);
984 if (trace_compiler_threads()) {
985 ResourceMark rm;
986 ThreadsListHandle tlh; // name() depends on the TLH.
987 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
988 stringStream msg;
989 msg.print("Added initial compiler thread %s", ct->name());
990 print_compiler_threads(msg);
991 }
992 }
993 }
994
995 for (int i = 0; i < _c1_count; i++) {
996 // Create a name for our thread.
997 jobject thread_handle = create_compiler_thread(_compilers[0], i, CHECK);
998 _compiler1_objects[i] = thread_handle;
999 _compiler1_logs[i] = nullptr;
1000
1001 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1002 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
1003 assert(ct != nullptr, "should have been handled for initial thread");
1004 _compilers[0]->set_num_compiler_threads(i + 1);
1005 if (trace_compiler_threads()) {
1006 ResourceMark rm;
1007 ThreadsListHandle tlh; // name() depends on the TLH.
1008 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1009 stringStream msg;
1010 msg.print("Added initial compiler thread %s", ct->name());
1011 print_compiler_threads(msg);
1012 }
1013 }
1014 }
1015
1016 if (UsePerfData) {
1017 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
1018 }
1019
1020 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1021 if (DeoptimizeObjectsALot) {
1022 // Initialize and start the object deoptimizer threads
1023 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1024 for (int count = 0; count < total_count; count++) {
1025 Handle thread_oop = JavaThread::create_system_thread_object("Deoptimize objects a lot single mode", CHECK);
1026 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1027 make_thread(deoptimizer_t, thread_handle, nullptr, nullptr, THREAD);
1028 }
1029 }
1030 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1031 }
1032
1033 void CompileBroker::init_training_replay() {
1034 // Ensure any exceptions lead to vm_exit_during_initialization.
1035 EXCEPTION_MARK;
1036 if (TrainingData::have_data()) {
1037 Handle thread_oop = JavaThread::create_system_thread_object("Training replay thread", CHECK);
1038 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1039 make_thread(training_replay_t, thread_handle, nullptr, nullptr, THREAD);
1040 }
1041 }
1042
1043 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
1044
1045 int old_c2_count = 0, new_c2_count = 0, old_c1_count = 0, new_c1_count = 0;
1046 const int c2_tasks_per_thread = 2, c1_tasks_per_thread = 4;
1047
1048 // Quick check if we already have enough compiler threads without taking the lock.
1049 // Numbers may change concurrently, so we read them again after we have the lock.
1050 if (_c2_compile_queue != nullptr) {
1051 old_c2_count = get_c2_thread_count();
1052 new_c2_count = MIN2(_c2_count, _c2_compile_queue->size() / c2_tasks_per_thread);
1053 }
1054 if (_c1_compile_queue != nullptr) {
1055 old_c1_count = get_c1_thread_count();
1056 new_c1_count = MIN2(_c1_count, _c1_compile_queue->size() / c1_tasks_per_thread);
1057 }
1058 if (new_c2_count <= old_c2_count && new_c1_count <= old_c1_count) return;
1059
1060 // Now, we do the more expensive operations.
1061 julong free_memory = os::free_memory();
1062 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1063 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1064 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1065
1066 // Only attempt to start additional threads if the lock is free.
1067 if (!CompileThread_lock->try_lock()) return;
1068
1069 if (_c2_compile_queue != nullptr) {
1070 old_c2_count = get_c2_thread_count();
1071 new_c2_count = MIN4(_c2_count,
1072 _c2_compile_queue->size() / c2_tasks_per_thread,
1073 (int)(free_memory / (200*M)),
1074 (int)(available_cc_np / (128*K)));
1075
1076 for (int i = old_c2_count; i < new_c2_count; i++) {
1077 #if INCLUDE_JVMCI
1078 if (UseJVMCICompiler && !UseJVMCINativeLibrary && _compiler2_objects[i] == nullptr) {
1079 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread objects as their
1080 // existence is completely hidden from the rest of the VM (and those compiler threads can't
1081 // call Java code to do the creation anyway).
1082 //
1083 // For pure Java JVMCI we have to create new j.l.Thread objects as they are visible and we
1084 // can see unexpected thread lifecycle transitions if we bind them to new JavaThreads. For
1085 // native library JVMCI it's preferred to use the C1/C2 strategy as this avoids unnecessary
1086 // coupling with Java.
1087 if (!THREAD->can_call_java()) break;
1088 char name_buffer[256];
1089 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i);
1090 Handle thread_oop;
1091 {
1092 // We have to give up the lock temporarily for the Java calls.
1093 MutexUnlocker mu(CompileThread_lock);
1094 thread_oop = JavaThread::create_system_thread_object(name_buffer, THREAD);
1095 }
1096 if (HAS_PENDING_EXCEPTION) {
1097 if (trace_compiler_threads()) {
1098 ResourceMark rm;
1099 stringStream msg;
1100 msg.print_cr("JVMCI compiler thread creation failed:");
1101 PENDING_EXCEPTION->print_on(&msg);
1102 print_compiler_threads(msg);
1103 }
1104 CLEAR_PENDING_EXCEPTION;
1105 break;
1106 }
1107 // Check if another thread has beaten us during the Java calls.
1108 if (get_c2_thread_count() != i) break;
1109 jobject thread_handle = JNIHandles::make_global(thread_oop);
1110 assert(compiler2_object(i) == nullptr, "Old one must be released!");
1111 _compiler2_objects[i] = thread_handle;
1112 }
1113 #endif
1114 guarantee(compiler2_object(i) != nullptr, "Thread oop must exist");
1115 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1116 if (ct == nullptr) break;
1117 _compilers[1]->set_num_compiler_threads(i + 1);
1118 if (trace_compiler_threads()) {
1119 ResourceMark rm;
1120 ThreadsListHandle tlh; // name() depends on the TLH.
1121 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1122 stringStream msg;
1123 msg.print("Added compiler thread %s (free memory: %dMB, available non-profiled code cache: %dMB)",
1124 ct->name(), (int)(free_memory/M), (int)(available_cc_np/M));
1125 print_compiler_threads(msg);
1126 }
1127 }
1128 }
1129
1130 if (_c1_compile_queue != nullptr) {
1131 old_c1_count = get_c1_thread_count();
1132 new_c1_count = MIN4(_c1_count,
1133 _c1_compile_queue->size() / c1_tasks_per_thread,
1134 (int)(free_memory / (100*M)),
1135 (int)(available_cc_p / (128*K)));
1136
1137 for (int i = old_c1_count; i < new_c1_count; i++) {
1138 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1139 if (ct == nullptr) break;
1140 _compilers[0]->set_num_compiler_threads(i + 1);
1141 if (trace_compiler_threads()) {
1142 ResourceMark rm;
1143 ThreadsListHandle tlh; // name() depends on the TLH.
1144 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1145 stringStream msg;
1146 msg.print("Added compiler thread %s (free memory: %dMB, available profiled code cache: %dMB)",
1147 ct->name(), (int)(free_memory/M), (int)(available_cc_p/M));
1148 print_compiler_threads(msg);
1149 }
1150 }
1151 }
1152
1153 CompileThread_lock->unlock();
1154 }
1155
1156
1157 /**
1158 * Set the methods on the stack as on_stack so that redefine classes doesn't
1159 * reclaim them. This method is executed at a safepoint.
1160 */
1161 void CompileBroker::mark_on_stack() {
1162 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1163 // Since we are at a safepoint, we do not need a lock to access
1164 // the compile queues.
1165 if (_c2_compile_queue != nullptr) {
1166 _c2_compile_queue->mark_on_stack();
1167 }
1168 if (_c1_compile_queue != nullptr) {
1169 _c1_compile_queue->mark_on_stack();
1170 }
1171 }
1172
1173 // ------------------------------------------------------------------
1174 // CompileBroker::compile_method
1175 //
1176 // Request compilation of a method.
1177 void CompileBroker::compile_method_base(const methodHandle& method,
1178 int osr_bci,
1179 int comp_level,
1180 int hot_count,
1181 CompileTask::CompileReason compile_reason,
1182 bool blocking,
1183 Thread* thread) {
1184 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1185 assert(method->method_holder()->is_instance_klass(),
1186 "sanity check");
1187 assert(!method->method_holder()->is_not_initialized(),
1188 "method holder must be initialized");
1189 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1190
1191 if (CIPrintRequests) {
1192 tty->print("request: ");
1193 method->print_short_name(tty);
1194 if (osr_bci != InvocationEntryBci) {
1195 tty->print(" osr_bci: %d", osr_bci);
1196 }
1197 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1198 if (hot_count > 0) {
1199 tty->print(" hot: yes");
1200 }
1201 tty->cr();
1202 }
1203
1204 // A request has been made for compilation. Before we do any
1205 // real work, check to see if the method has been compiled
1206 // in the meantime with a definitive result.
1207 if (compilation_is_complete(method, osr_bci, comp_level)) {
1208 return;
1209 }
1210
1211 #ifndef PRODUCT
1212 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1213 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1214 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1215 return;
1216 }
1217 }
1218 #endif
1219
1220 // If this method is already in the compile queue, then
1221 // we do not block the current thread.
1222 if (compilation_is_in_queue(method)) {
1223 // We may want to decay our counter a bit here to prevent
1224 // multiple denied requests for compilation. This is an
1225 // open compilation policy issue. Note: The other possibility,
1226 // in the case that this is a blocking compile request, is to have
1227 // all subsequent blocking requesters wait for completion of
1228 // ongoing compiles. Note that in this case we'll need a protocol
1229 // for freeing the associated compile tasks. [Or we could have
1230 // a single static monitor on which all these waiters sleep.]
1231 return;
1232 }
1233
1234 // Tiered policy requires MethodCounters to exist before adding a method to
1235 // the queue. Create if we don't have them yet.
1236 method->get_method_counters(thread);
1237
1238 // Outputs from the following MutexLocker block:
1239 CompileTask* task = nullptr;
1240 CompileQueue* queue = compile_queue(comp_level);
1241
1242 // Acquire our lock.
1243 {
1244 MutexLocker locker(thread, MethodCompileQueue_lock);
1245
1246 // Make sure the method has not slipped into the queues since
1247 // last we checked; note that those checks were "fast bail-outs".
1248 // Here we need to be more careful, see 14012000 below.
1249 if (compilation_is_in_queue(method)) {
1250 return;
1251 }
1252
1253 // We need to check again to see if the compilation has
1254 // completed. A previous compilation may have registered
1255 // some result.
1256 if (compilation_is_complete(method, osr_bci, comp_level)) {
1257 return;
1258 }
1259
1260 // We now know that this compilation is not pending, complete,
1261 // or prohibited. Assign a compile_id to this compilation
1262 // and check to see if it is in our [Start..Stop) range.
1263 int compile_id = assign_compile_id(method, osr_bci);
1264 if (compile_id == 0) {
1265 // The compilation falls outside the allowed range.
1266 return;
1267 }
1268
1269 #if INCLUDE_JVMCI
1270 if (UseJVMCICompiler && blocking) {
1271 // Don't allow blocking compiles for requests triggered by JVMCI.
1272 if (thread->is_Compiler_thread()) {
1273 blocking = false;
1274 }
1275
1276 // In libjvmci, JVMCI initialization should not deadlock with other threads
1277 if (!UseJVMCINativeLibrary) {
1278 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1279 vframeStream vfst(JavaThread::cast(thread));
1280 for (; !vfst.at_end(); vfst.next()) {
1281 if (vfst.method()->is_static_initializer() ||
1282 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1283 vfst.method()->name() == vmSymbols::loadClass_name())) {
1284 blocking = false;
1285 break;
1286 }
1287 }
1288
1289 // Don't allow blocking compilation requests to JVMCI
1290 // if JVMCI itself is not yet initialized
1291 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1292 blocking = false;
1293 }
1294 }
1295
1296 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1297 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1298 // such as the DestroyJavaVM thread.
1299 if (JVMCI::in_shutdown()) {
1300 blocking = false;
1301 }
1302 }
1303 #endif // INCLUDE_JVMCI
1304
1305 // We will enter the compilation in the queue.
1306 // 14012000: Note that this sets the queued_for_compile bits in
1307 // the target method. We can now reason that a method cannot be
1308 // queued for compilation more than once, as follows:
1309 // Before a thread queues a task for compilation, it first acquires
1310 // the compile queue lock, then checks if the method's queued bits
1311 // are set or it has already been compiled. Thus there can not be two
1312 // instances of a compilation task for the same method on the
1313 // compilation queue. Consider now the case where the compilation
1314 // thread has already removed a task for that method from the queue
1315 // and is in the midst of compiling it. In this case, the
1316 // queued_for_compile bits must be set in the method (and these
1317 // will be visible to the current thread, since the bits were set
1318 // under protection of the compile queue lock, which we hold now.
1319 // When the compilation completes, the compiler thread first sets
1320 // the compilation result and then clears the queued_for_compile
1321 // bits. Neither of these actions are protected by a barrier (or done
1322 // under the protection of a lock), so the only guarantee we have
1323 // (on machines with TSO (Total Store Order)) is that these values
1324 // will update in that order. As a result, the only combinations of
1325 // these bits that the current thread will see are, in temporal order:
1326 // <RESULT, QUEUE> :
1327 // <0, 1> : in compile queue, but not yet compiled
1328 // <1, 1> : compiled but queue bit not cleared
1329 // <1, 0> : compiled and queue bit cleared
1330 // Because we first check the queue bits then check the result bits,
1331 // we are assured that we cannot introduce a duplicate task.
1332 // Note that if we did the tests in the reverse order (i.e. check
1333 // result then check queued bit), we could get the result bit before
1334 // the compilation completed, and the queue bit after the compilation
1335 // completed, and end up introducing a "duplicate" (redundant) task.
1336 // In that case, the compiler thread should first check if a method
1337 // has already been compiled before trying to compile it.
1338 // NOTE: in the event that there are multiple compiler threads and
1339 // there is de-optimization/recompilation, things will get hairy,
1340 // and in that case it's best to protect both the testing (here) of
1341 // these bits, and their updating (here and elsewhere) under a
1342 // common lock.
1343 task = create_compile_task(queue,
1344 compile_id, method,
1345 osr_bci, comp_level,
1346 hot_count, compile_reason,
1347 blocking);
1348 }
1349
1350 if (blocking) {
1351 wait_for_completion(task);
1352 }
1353 }
1354
1355 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1356 int comp_level,
1357 int hot_count,
1358 CompileTask::CompileReason compile_reason,
1359 TRAPS) {
1360 // Do nothing if compilebroker is not initialized or compiles are submitted on level none
1361 if (!_initialized || comp_level == CompLevel_none) {
1362 return nullptr;
1363 }
1364
1365 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1366 assert(comp != nullptr, "Ensure we have a compiler");
1367
1368 #if INCLUDE_JVMCI
1369 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1370 // JVMCI compilation is not yet initializable.
1371 return nullptr;
1372 }
1373 #endif
1374
1375 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1376 // CompileBroker::compile_method can trap and can have pending async exception.
1377 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_count, compile_reason, directive, THREAD);
1378 DirectivesStack::release(directive);
1379 return nm;
1380 }
1381
1382 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1383 int comp_level,
1384 int hot_count,
1385 CompileTask::CompileReason compile_reason,
1386 DirectiveSet* directive,
1387 TRAPS) {
1388
1389 // make sure arguments make sense
1390 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1391 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1392 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1393 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1394 // return quickly if possible
1395
1396 // lock, make sure that the compilation
1397 // isn't prohibited in a straightforward way.
1398 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1399 if (comp == nullptr || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1400 return nullptr;
1401 }
1402
1403 if (osr_bci == InvocationEntryBci) {
1404 // standard compilation
1405 nmethod* method_code = method->code();
1406 if (method_code != nullptr) {
1407 if (compilation_is_complete(method, osr_bci, comp_level)) {
1408 return method_code;
1409 }
1410 }
1411 if (method->is_not_compilable(comp_level)) {
1412 return nullptr;
1413 }
1414 } else {
1415 // osr compilation
1416 // We accept a higher level osr method
1417 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1418 if (nm != nullptr) return nm;
1419 if (method->is_not_osr_compilable(comp_level)) return nullptr;
1420 }
1421
1422 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1423 // some prerequisites that are compiler specific
1424 if (comp->is_c2() || comp->is_jvmci()) {
1425 InternalOOMEMark iom(THREAD);
1426 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1427 // Resolve all classes seen in the signature of the method
1428 // we are compiling.
1429 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1430 }
1431
1432 // If the method is native, do the lookup in the thread requesting
1433 // the compilation. Native lookups can load code, which is not
1434 // permitted during compilation.
1435 //
1436 // Note: A native method implies non-osr compilation which is
1437 // checked with an assertion at the entry of this method.
1438 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1439 address adr = NativeLookup::lookup(method, THREAD);
1440 if (HAS_PENDING_EXCEPTION) {
1441 // In case of an exception looking up the method, we just forget
1442 // about it. The interpreter will kick-in and throw the exception.
1443 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1444 CLEAR_PENDING_EXCEPTION;
1445 return nullptr;
1446 }
1447 assert(method->has_native_function(), "must have native code by now");
1448 }
1449
1450 // RedefineClasses() has replaced this method; just return
1451 if (method->is_old()) {
1452 return nullptr;
1453 }
1454
1455 // JVMTI -- post_compile_event requires jmethod_id() that may require
1456 // a lock the compiling thread can not acquire. Prefetch it here.
1457 if (JvmtiExport::should_post_compiled_method_load()) {
1458 method->jmethod_id();
1459 }
1460
1461 // do the compilation
1462 if (method->is_native()) {
1463 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1464 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1465 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1466 //
1467 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1468 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1469 AdapterHandlerLibrary::create_native_wrapper(method);
1470 } else {
1471 return nullptr;
1472 }
1473 } else {
1474 // If the compiler is shut off due to code cache getting full
1475 // fail out now so blocking compiles dont hang the java thread
1476 if (!should_compile_new_jobs()) {
1477 return nullptr;
1478 }
1479 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1480 compile_method_base(method, osr_bci, comp_level, hot_count, compile_reason, is_blocking, THREAD);
1481 }
1482
1483 // return requested nmethod
1484 // We accept a higher level osr method
1485 if (osr_bci == InvocationEntryBci) {
1486 return method->code();
1487 }
1488 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1489 }
1490
1491
1492 // ------------------------------------------------------------------
1493 // CompileBroker::compilation_is_complete
1494 //
1495 // See if compilation of this method is already complete.
1496 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1497 int osr_bci,
1498 int comp_level) {
1499 bool is_osr = (osr_bci != standard_entry_bci);
1500 if (is_osr) {
1501 if (method->is_not_osr_compilable(comp_level)) {
1502 return true;
1503 } else {
1504 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1505 return (result != nullptr);
1506 }
1507 } else {
1508 if (method->is_not_compilable(comp_level)) {
1509 return true;
1510 } else {
1511 nmethod* result = method->code();
1512 if (result == nullptr) return false;
1513 return comp_level == result->comp_level();
1514 }
1515 }
1516 }
1517
1518
1519 /**
1520 * See if this compilation is already requested.
1521 *
1522 * Implementation note: there is only a single "is in queue" bit
1523 * for each method. This means that the check below is overly
1524 * conservative in the sense that an osr compilation in the queue
1525 * will block a normal compilation from entering the queue (and vice
1526 * versa). This can be remedied by a full queue search to disambiguate
1527 * cases. If it is deemed profitable, this may be done.
1528 */
1529 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1530 return method->queued_for_compilation();
1531 }
1532
1533 // ------------------------------------------------------------------
1534 // CompileBroker::compilation_is_prohibited
1535 //
1536 // See if this compilation is not allowed.
1537 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1538 bool is_native = method->is_native();
1539 // Some compilers may not support the compilation of natives.
1540 AbstractCompiler *comp = compiler(comp_level);
1541 if (is_native && (!CICompileNatives || comp == nullptr)) {
1542 method->set_not_compilable_quietly("native methods not supported", comp_level);
1543 return true;
1544 }
1545
1546 bool is_osr = (osr_bci != standard_entry_bci);
1547 // Some compilers may not support on stack replacement.
1548 if (is_osr && (!CICompileOSR || comp == nullptr)) {
1549 method->set_not_osr_compilable("OSR not supported", comp_level);
1550 return true;
1551 }
1552
1553 // The method may be explicitly excluded by the user.
1554 double scale;
1555 if (excluded || (CompilerOracle::has_option_value(method, CompileCommandEnum::CompileThresholdScaling, scale) && scale == 0)) {
1556 bool quietly = CompilerOracle::be_quiet();
1557 if (PrintCompilation && !quietly) {
1558 // This does not happen quietly...
1559 ResourceMark rm;
1560 tty->print("### Excluding %s:%s",
1561 method->is_native() ? "generation of native wrapper" : "compile",
1562 (method->is_static() ? " static" : ""));
1563 method->print_short_name(tty);
1564 tty->cr();
1565 }
1566 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1567 }
1568
1569 return false;
1570 }
1571
1572 /**
1573 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1574 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1575 * The function also allows to generate separate compilation IDs for OSR compilations.
1576 */
1577 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1578 #ifdef ASSERT
1579 bool is_osr = (osr_bci != standard_entry_bci);
1580 int id;
1581 if (method->is_native()) {
1582 assert(!is_osr, "can't be osr");
1583 // Adapters, native wrappers and method handle intrinsics
1584 // should be generated always.
1585 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1586 } else if (CICountOSR && is_osr) {
1587 id = Atomic::add(&_osr_compilation_id, 1);
1588 if (CIStartOSR <= id && id < CIStopOSR) {
1589 return id;
1590 }
1591 } else {
1592 id = Atomic::add(&_compilation_id, 1);
1593 if (CIStart <= id && id < CIStop) {
1594 return id;
1595 }
1596 }
1597
1598 // Method was not in the appropriate compilation range.
1599 method->set_not_compilable_quietly("Not in requested compile id range");
1600 return 0;
1601 #else
1602 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1603 // only _compilation_id is incremented.
1604 return Atomic::add(&_compilation_id, 1);
1605 #endif
1606 }
1607
1608 // ------------------------------------------------------------------
1609 // CompileBroker::assign_compile_id_unlocked
1610 //
1611 // Public wrapper for assign_compile_id that acquires the needed locks
1612 int CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1613 MutexLocker locker(thread, MethodCompileQueue_lock);
1614 return assign_compile_id(method, osr_bci);
1615 }
1616
1617 // ------------------------------------------------------------------
1618 // CompileBroker::create_compile_task
1619 //
1620 // Create a CompileTask object representing the current request for
1621 // compilation. Add this task to the queue.
1622 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1623 int compile_id,
1624 const methodHandle& method,
1625 int osr_bci,
1626 int comp_level,
1627 int hot_count,
1628 CompileTask::CompileReason compile_reason,
1629 bool blocking) {
1630 CompileTask* new_task = CompileTask::allocate();
1631 new_task->initialize(compile_id, method, osr_bci, comp_level,
1632 hot_count, compile_reason,
1633 blocking);
1634 queue->add(new_task);
1635 return new_task;
1636 }
1637
1638 #if INCLUDE_JVMCI
1639 // The number of milliseconds to wait before checking if
1640 // JVMCI compilation has made progress.
1641 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1642
1643 // The number of JVMCI compilation progress checks that must fail
1644 // before unblocking a thread waiting for a blocking compilation.
1645 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1646
1647 /**
1648 * Waits for a JVMCI compiler to complete a given task. This thread
1649 * waits until either the task completes or it sees no JVMCI compilation
1650 * progress for N consecutive milliseconds where N is
1651 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1652 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1653 *
1654 * @return true if this thread needs to free/recycle the task
1655 */
1656 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1657 assert(UseJVMCICompiler, "sanity");
1658 MonitorLocker ml(thread, task->lock());
1659 int progress_wait_attempts = 0;
1660 jint thread_jvmci_compilation_ticks = 0;
1661 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1662 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1663 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1664 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1665
1666 bool progress;
1667 if (jvmci_compile_state != nullptr) {
1668 jint ticks = jvmci_compile_state->compilation_ticks();
1669 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1670 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1671 thread_jvmci_compilation_ticks = ticks;
1672 } else {
1673 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1674 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1675 // compilation ticks to determine whether JVMCI compilation
1676 // is still making progress through the JVMCI compiler queue.
1677 jint ticks = jvmci->global_compilation_ticks();
1678 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1679 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1680 global_jvmci_compilation_ticks = ticks;
1681 }
1682
1683 if (!progress) {
1684 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1685 if (PrintCompilation) {
1686 task->print(tty, "wait for blocking compilation timed out");
1687 }
1688 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1689 break;
1690 }
1691 } else {
1692 progress_wait_attempts = 0;
1693 }
1694 }
1695 task->clear_waiter();
1696 return task->is_complete();
1697 }
1698 #endif
1699
1700 /**
1701 * Wait for the compilation task to complete.
1702 */
1703 void CompileBroker::wait_for_completion(CompileTask* task) {
1704 if (CIPrintCompileQueue) {
1705 ttyLocker ttyl;
1706 tty->print_cr("BLOCKING FOR COMPILE");
1707 }
1708
1709 assert(task->is_blocking(), "can only wait on blocking task");
1710
1711 JavaThread* thread = JavaThread::current();
1712
1713 methodHandle method(thread, task->method());
1714 bool free_task;
1715 #if INCLUDE_JVMCI
1716 AbstractCompiler* comp = compiler(task->comp_level());
1717 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) {
1718 // It may return before compilation is completed.
1719 // Note that libjvmci should not pre-emptively unblock
1720 // a thread waiting for a compilation as it does not call
1721 // Java code and so is not deadlock prone like jarjvmci.
1722 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1723 } else
1724 #endif
1725 {
1726 MonitorLocker ml(thread, task->lock());
1727 free_task = true;
1728 task->inc_waiting_for_completion();
1729 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1730 ml.wait();
1731 }
1732 task->dec_waiting_for_completion();
1733 }
1734
1735 if (free_task) {
1736 if (is_compilation_disabled_forever()) {
1737 CompileTask::free(task);
1738 return;
1739 }
1740
1741 // It is harmless to check this status without the lock, because
1742 // completion is a stable property (until the task object is recycled).
1743 assert(task->is_complete(), "Compilation should have completed");
1744
1745 // By convention, the waiter is responsible for recycling a
1746 // blocking CompileTask. Since there is only one waiter ever
1747 // waiting on a CompileTask, we know that no one else will
1748 // be using this CompileTask; we can free it.
1749 CompileTask::free(task);
1750 }
1751 }
1752
1753 /**
1754 * Initialize compiler thread(s) + compiler object(s). The postcondition
1755 * of this function is that the compiler runtimes are initialized and that
1756 * compiler threads can start compiling.
1757 */
1758 bool CompileBroker::init_compiler_runtime() {
1759 CompilerThread* thread = CompilerThread::current();
1760 AbstractCompiler* comp = thread->compiler();
1761 // Final sanity check - the compiler object must exist
1762 guarantee(comp != nullptr, "Compiler object must exist");
1763
1764 {
1765 // Must switch to native to allocate ci_env
1766 ThreadToNativeFromVM ttn(thread);
1767 ciEnv ci_env((CompileTask*)nullptr);
1768 // Cache Jvmti state
1769 ci_env.cache_jvmti_state();
1770 // Cache DTrace flags
1771 ci_env.cache_dtrace_flags();
1772
1773 // Switch back to VM state to do compiler initialization
1774 ThreadInVMfromNative tv(thread);
1775
1776 // Perform per-thread and global initializations
1777 comp->initialize();
1778 }
1779
1780 if (comp->is_failed()) {
1781 disable_compilation_forever();
1782 // If compiler initialization failed, no compiler thread that is specific to a
1783 // particular compiler runtime will ever start to compile methods.
1784 shutdown_compiler_runtime(comp, thread);
1785 return false;
1786 }
1787
1788 // C1 specific check
1789 if (comp->is_c1() && (thread->get_buffer_blob() == nullptr)) {
1790 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1791 return false;
1792 }
1793
1794 return true;
1795 }
1796
1797 void CompileBroker::free_buffer_blob_if_allocated(CompilerThread* thread) {
1798 BufferBlob* blob = thread->get_buffer_blob();
1799 if (blob != nullptr) {
1800 blob->purge();
1801 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1802 CodeCache::free(blob);
1803 }
1804 }
1805
1806 /**
1807 * If C1 and/or C2 initialization failed, we shut down all compilation.
1808 * We do this to keep things simple. This can be changed if it ever turns
1809 * out to be a problem.
1810 */
1811 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1812 free_buffer_blob_if_allocated(thread);
1813
1814 if (comp->should_perform_shutdown()) {
1815 // There are two reasons for shutting down the compiler
1816 // 1) compiler runtime initialization failed
1817 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1818 warning("%s initialization failed. Shutting down all compilers", comp->name());
1819
1820 // Only one thread per compiler runtime object enters here
1821 // Set state to shut down
1822 comp->set_shut_down();
1823
1824 // Delete all queued compilation tasks to make compiler threads exit faster.
1825 if (_c1_compile_queue != nullptr) {
1826 _c1_compile_queue->free_all();
1827 }
1828
1829 if (_c2_compile_queue != nullptr) {
1830 _c2_compile_queue->free_all();
1831 }
1832
1833 // Set flags so that we continue execution with using interpreter only.
1834 UseCompiler = false;
1835 UseInterpreter = true;
1836
1837 // We could delete compiler runtimes also. However, there are references to
1838 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1839 // fail. This can be done later if necessary.
1840 }
1841 }
1842
1843 /**
1844 * Helper function to create new or reuse old CompileLog.
1845 */
1846 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1847 if (!LogCompilation) return nullptr;
1848
1849 AbstractCompiler *compiler = ct->compiler();
1850 bool c1 = compiler->is_c1();
1851 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1852 assert(compiler_objects != nullptr, "must be initialized at this point");
1853 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1854 assert(logs != nullptr, "must be initialized at this point");
1855 int count = c1 ? _c1_count : _c2_count;
1856
1857 // Find Compiler number by its threadObj.
1858 oop compiler_obj = ct->threadObj();
1859 int compiler_number = 0;
1860 bool found = false;
1861 for (; compiler_number < count; compiler_number++) {
1862 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1863 found = true;
1864 break;
1865 }
1866 }
1867 assert(found, "Compiler must exist at this point");
1868
1869 // Determine pointer for this thread's log.
1870 CompileLog** log_ptr = &logs[compiler_number];
1871
1872 // Return old one if it exists.
1873 CompileLog* log = *log_ptr;
1874 if (log != nullptr) {
1875 ct->init_log(log);
1876 return log;
1877 }
1878
1879 // Create a new one and remember it.
1880 init_compiler_thread_log();
1881 log = ct->log();
1882 *log_ptr = log;
1883 return log;
1884 }
1885
1886 // ------------------------------------------------------------------
1887 // CompileBroker::compiler_thread_loop
1888 //
1889 // The main loop run by a CompilerThread.
1890 void CompileBroker::compiler_thread_loop() {
1891 CompilerThread* thread = CompilerThread::current();
1892 CompileQueue* queue = thread->queue();
1893 // For the thread that initializes the ciObjectFactory
1894 // this resource mark holds all the shared objects
1895 ResourceMark rm;
1896
1897 // First thread to get here will initialize the compiler interface
1898
1899 {
1900 ASSERT_IN_VM;
1901 MutexLocker only_one (thread, CompileThread_lock);
1902 if (!ciObjectFactory::is_initialized()) {
1903 ciObjectFactory::initialize();
1904 }
1905 }
1906
1907 // Open a log.
1908 CompileLog* log = get_log(thread);
1909 if (log != nullptr) {
1910 log->begin_elem("start_compile_thread name='%s' thread='%zu' process='%d'",
1911 thread->name(),
1912 os::current_thread_id(),
1913 os::current_process_id());
1914 log->stamp();
1915 log->end_elem();
1916 }
1917
1918 // If compiler thread/runtime initialization fails, exit the compiler thread
1919 if (!init_compiler_runtime()) {
1920 return;
1921 }
1922
1923 thread->start_idle_timer();
1924
1925 // Poll for new compilation tasks as long as the JVM runs. Compilation
1926 // should only be disabled if something went wrong while initializing the
1927 // compiler runtimes. This, in turn, should not happen. The only known case
1928 // when compiler runtime initialization fails is if there is not enough free
1929 // space in the code cache to generate the necessary stubs, etc.
1930 while (!is_compilation_disabled_forever()) {
1931 // We need this HandleMark to avoid leaking VM handles.
1932 HandleMark hm(thread);
1933
1934 CompileTask* task = queue->get(thread);
1935 if (task == nullptr) {
1936 if (UseDynamicNumberOfCompilerThreads) {
1937 // Access compiler_count under lock to enforce consistency.
1938 MutexLocker only_one(CompileThread_lock);
1939 if (can_remove(thread, true)) {
1940 if (trace_compiler_threads()) {
1941 ResourceMark rm;
1942 stringStream msg;
1943 msg.print("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1944 thread->name(), thread->idle_time_millis());
1945 print_compiler_threads(msg);
1946 }
1947
1948 // Notify compiler that the compiler thread is about to stop
1949 thread->compiler()->stopping_compiler_thread(thread);
1950
1951 free_buffer_blob_if_allocated(thread);
1952 return; // Stop this thread.
1953 }
1954 }
1955 } else {
1956 // Assign the task to the current thread. Mark this compilation
1957 // thread as active for the profiler.
1958 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1959 // occurs after fetching the compile task off the queue.
1960 CompileTaskWrapper ctw(task);
1961 methodHandle method(thread, task->method());
1962
1963 // Never compile a method if breakpoints are present in it
1964 if (method()->number_of_breakpoints() == 0) {
1965 // Compile the method.
1966 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1967 invoke_compiler_on_method(task);
1968 thread->start_idle_timer();
1969 } else {
1970 // After compilation is disabled, remove remaining methods from queue
1971 method->clear_queued_for_compilation();
1972 task->set_failure_reason("compilation is disabled");
1973 }
1974 } else {
1975 task->set_failure_reason("breakpoints are present");
1976 }
1977
1978 if (UseDynamicNumberOfCompilerThreads) {
1979 possibly_add_compiler_threads(thread);
1980 assert(!thread->has_pending_exception(), "should have been handled");
1981 }
1982 }
1983 }
1984
1985 // Shut down compiler runtime
1986 shutdown_compiler_runtime(thread->compiler(), thread);
1987 }
1988
1989 // ------------------------------------------------------------------
1990 // CompileBroker::init_compiler_thread_log
1991 //
1992 // Set up state required by +LogCompilation.
1993 void CompileBroker::init_compiler_thread_log() {
1994 CompilerThread* thread = CompilerThread::current();
1995 char file_name[4*K];
1996 FILE* fp = nullptr;
1997 intx thread_id = os::current_thread_id();
1998 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1999 const char* dir = (try_temp_dir ? os::get_temp_directory() : nullptr);
2000 if (dir == nullptr) {
2001 jio_snprintf(file_name, sizeof(file_name), "hs_c%zu_pid%u.log",
2002 thread_id, os::current_process_id());
2003 } else {
2004 jio_snprintf(file_name, sizeof(file_name),
2005 "%s%shs_c%zu_pid%u.log", dir,
2006 os::file_separator(), thread_id, os::current_process_id());
2007 }
2008
2009 fp = os::fopen(file_name, "wt");
2010 if (fp != nullptr) {
2011 if (LogCompilation && Verbose) {
2012 tty->print_cr("Opening compilation log %s", file_name);
2013 }
2014 CompileLog* log = new(mtCompiler) CompileLog(file_name, fp, thread_id);
2015 if (log == nullptr) {
2016 fclose(fp);
2017 return;
2018 }
2019 thread->init_log(log);
2020
2021 if (xtty != nullptr) {
2022 ttyLocker ttyl;
2023 // Record any per thread log files
2024 xtty->elem("thread_logfile thread='%zd' filename='%s'", thread_id, file_name);
2025 }
2026 return;
2027 }
2028 }
2029 warning("Cannot open log file: %s", file_name);
2030 }
2031
2032 void CompileBroker::log_metaspace_failure() {
2033 const char* message = "some methods may not be compiled because metaspace "
2034 "is out of memory";
2035 if (CompilationLog::log() != nullptr) {
2036 CompilationLog::log()->log_metaspace_failure(message);
2037 }
2038 if (PrintCompilation) {
2039 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2040 }
2041 }
2042
2043
2044 // ------------------------------------------------------------------
2045 // CompileBroker::set_should_block
2046 //
2047 // Set _should_block.
2048 // Call this from the VM, with Threads_lock held and a safepoint requested.
2049 void CompileBroker::set_should_block() {
2050 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2051 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2052 #ifndef PRODUCT
2053 if (PrintCompilation && (Verbose || WizardMode))
2054 tty->print_cr("notifying compiler thread pool to block");
2055 #endif
2056 _should_block = true;
2057 }
2058
2059 // ------------------------------------------------------------------
2060 // CompileBroker::maybe_block
2061 //
2062 // Call this from the compiler at convenient points, to poll for _should_block.
2063 void CompileBroker::maybe_block() {
2064 if (_should_block) {
2065 #ifndef PRODUCT
2066 if (PrintCompilation && (Verbose || WizardMode))
2067 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2068 #endif
2069 // If we are executing a task during the request to block, report the task
2070 // before disappearing.
2071 CompilerThread* thread = CompilerThread::current();
2072 if (thread != nullptr) {
2073 CompileTask* task = thread->task();
2074 if (task != nullptr) {
2075 if (PrintCompilation) {
2076 task->print(tty, "blocked");
2077 }
2078 task->print_ul("blocked");
2079 }
2080 }
2081 // Go to VM state and block for final VM shutdown safepoint.
2082 ThreadInVMfromNative tivfn(JavaThread::current());
2083 assert(false, "Should never unblock from TIVNM entry");
2084 }
2085 }
2086
2087 // wrapper for CodeCache::print_summary()
2088 static void codecache_print(bool detailed)
2089 {
2090 stringStream s;
2091 // Dump code cache into a buffer before locking the tty,
2092 {
2093 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2094 CodeCache::print_summary(&s, detailed);
2095 }
2096 ttyLocker ttyl;
2097 tty->print("%s", s.freeze());
2098 }
2099
2100 // wrapper for CodeCache::print_summary() using outputStream
2101 static void codecache_print(outputStream* out, bool detailed) {
2102 stringStream s;
2103
2104 // Dump code cache into a buffer
2105 {
2106 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2107 CodeCache::print_summary(&s, detailed);
2108 }
2109
2110 char* remaining_log = s.as_string();
2111 while (*remaining_log != '\0') {
2112 char* eol = strchr(remaining_log, '\n');
2113 if (eol == nullptr) {
2114 out->print_cr("%s", remaining_log);
2115 remaining_log = remaining_log + strlen(remaining_log);
2116 } else {
2117 *eol = '\0';
2118 out->print_cr("%s", remaining_log);
2119 remaining_log = eol + 1;
2120 }
2121 }
2122 }
2123
2124 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env,
2125 int compilable, const char* failure_reason) {
2126 if (!AbortVMOnCompilationFailure) {
2127 return;
2128 }
2129 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2130 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2131 }
2132 if (compilable == ciEnv::MethodCompilable_never) {
2133 fatal("Never compilable: %s", failure_reason);
2134 }
2135 }
2136
2137 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2138 assert(task != nullptr, "invariant");
2139 CompilerEvent::CompilationEvent::post(event,
2140 task->compile_id(),
2141 task->compiler()->type(),
2142 task->method(),
2143 task->comp_level(),
2144 task->is_success(),
2145 task->osr_bci() != CompileBroker::standard_entry_bci,
2146 task->nm_total_size(),
2147 task->num_inlined_bytecodes(),
2148 task->arena_bytes());
2149 }
2150
2151 int DirectivesStack::_depth = 0;
2152 CompilerDirectives* DirectivesStack::_top = nullptr;
2153 CompilerDirectives* DirectivesStack::_bottom = nullptr;
2154
2155 // Acquires Compilation_lock and waits for it to be notified
2156 // as long as WhiteBox::compilation_locked is true.
2157 static void whitebox_lock_compilation() {
2158 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2159 while (WhiteBox::compilation_locked) {
2160 locker.wait();
2161 }
2162 }
2163
2164 // ------------------------------------------------------------------
2165 // CompileBroker::invoke_compiler_on_method
2166 //
2167 // Compile a method.
2168 //
2169 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2170 task->print_ul();
2171 elapsedTimer time;
2172
2173 DirectiveSet* directive = task->directive();
2174 if (directive->PrintCompilationOption) {
2175 ResourceMark rm;
2176 task->print_tty();
2177 }
2178
2179 CompilerThread* thread = CompilerThread::current();
2180 ResourceMark rm(thread);
2181
2182 if (CompilationLog::log() != nullptr) {
2183 CompilationLog::log()->log_compile(thread, task);
2184 }
2185
2186 // Common flags.
2187 int compile_id = task->compile_id();
2188 int osr_bci = task->osr_bci();
2189 bool is_osr = (osr_bci != standard_entry_bci);
2190 bool should_log = (thread->log() != nullptr);
2191 bool should_break = false;
2192 const int task_level = task->comp_level();
2193 AbstractCompiler* comp = task->compiler();
2194 {
2195 // create the handle inside it's own block so it can't
2196 // accidentally be referenced once the thread transitions to
2197 // native. The NoHandleMark before the transition should catch
2198 // any cases where this occurs in the future.
2199 methodHandle method(thread, task->method());
2200
2201 assert(!method->is_native(), "no longer compile natives");
2202
2203 // Update compile information when using perfdata.
2204 if (UsePerfData) {
2205 update_compile_perf_data(thread, method, is_osr);
2206 }
2207
2208 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2209 }
2210
2211 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2212 if (should_log && !directive->LogOption) {
2213 should_log = false;
2214 }
2215
2216 // Allocate a new set of JNI handles.
2217 JNIHandleMark jhm(thread);
2218 Method* target_handle = task->method();
2219 int compilable = ciEnv::MethodCompilable;
2220 const char* failure_reason = nullptr;
2221 bool failure_reason_on_C_heap = false;
2222 const char* retry_message = nullptr;
2223
2224 #if INCLUDE_JVMCI
2225 if (UseJVMCICompiler && comp != nullptr && comp->is_jvmci()) {
2226 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2227
2228 TraceTime t1("compilation", &time);
2229 EventCompilation event;
2230 JVMCICompileState compile_state(task, jvmci);
2231 JVMCIRuntime *runtime = nullptr;
2232
2233 if (JVMCI::in_shutdown()) {
2234 failure_reason = "in JVMCI shutdown";
2235 retry_message = "not retryable";
2236 compilable = ciEnv::MethodCompilable_never;
2237 } else if (compile_state.target_method_is_old()) {
2238 // Skip redefined methods
2239 failure_reason = "redefined method";
2240 retry_message = "not retryable";
2241 compilable = ciEnv::MethodCompilable_never;
2242 } else {
2243 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2244 if (env.init_error() != JNI_OK) {
2245 const char* msg = env.init_error_msg();
2246 failure_reason = os::strdup(err_msg("Error attaching to libjvmci (err: %d, %s)",
2247 env.init_error(), msg == nullptr ? "unknown" : msg), mtJVMCI);
2248 bool reason_on_C_heap = true;
2249 // In case of JNI_ENOMEM, there's a good chance a subsequent attempt to create libjvmci or attach to it
2250 // might succeed. Other errors most likely indicate a non-recoverable error in the JVMCI runtime.
2251 bool retryable = env.init_error() == JNI_ENOMEM;
2252 compile_state.set_failure(retryable, failure_reason, reason_on_C_heap);
2253 }
2254 if (failure_reason == nullptr) {
2255 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2256 // Must switch to native to block
2257 ThreadToNativeFromVM ttn(thread);
2258 whitebox_lock_compilation();
2259 }
2260 methodHandle method(thread, target_handle);
2261 runtime = env.runtime();
2262 runtime->compile_method(&env, jvmci, method, osr_bci);
2263
2264 failure_reason = compile_state.failure_reason();
2265 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2266 if (!compile_state.retryable()) {
2267 retry_message = "not retryable";
2268 compilable = ciEnv::MethodCompilable_not_at_tier;
2269 }
2270 if (!task->is_success()) {
2271 assert(failure_reason != nullptr, "must specify failure_reason");
2272 }
2273 }
2274 }
2275 if (!task->is_success() && !JVMCI::in_shutdown()) {
2276 handle_compile_error(thread, task, nullptr, compilable, failure_reason);
2277 }
2278 if (event.should_commit()) {
2279 post_compilation_event(event, task);
2280 }
2281
2282 if (runtime != nullptr) {
2283 runtime->post_compile(thread);
2284 }
2285 } else
2286 #endif // INCLUDE_JVMCI
2287 {
2288 NoHandleMark nhm;
2289 ThreadToNativeFromVM ttn(thread);
2290
2291 ciEnv ci_env(task);
2292 if (should_break) {
2293 ci_env.set_break_at_compile(true);
2294 }
2295 if (should_log) {
2296 ci_env.set_log(thread->log());
2297 }
2298 assert(thread->env() == &ci_env, "set by ci_env");
2299 // The thread-env() field is cleared in ~CompileTaskWrapper.
2300
2301 // Cache Jvmti state
2302 bool method_is_old = ci_env.cache_jvmti_state();
2303
2304 // Skip redefined methods
2305 if (method_is_old) {
2306 ci_env.record_method_not_compilable("redefined method", true);
2307 }
2308
2309 // Cache DTrace flags
2310 ci_env.cache_dtrace_flags();
2311
2312 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2313
2314 TraceTime t1("compilation", &time);
2315 EventCompilation event;
2316
2317 if (comp == nullptr) {
2318 ci_env.record_method_not_compilable("no compiler");
2319 } else if (!ci_env.failing()) {
2320 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2321 whitebox_lock_compilation();
2322 }
2323 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2324
2325 /* Repeat compilation without installing code for profiling purposes */
2326 int repeat_compilation_count = directive->RepeatCompilationOption;
2327 while (repeat_compilation_count > 0) {
2328 ResourceMark rm(thread);
2329 task->print_ul("NO CODE INSTALLED");
2330 comp->compile_method(&ci_env, target, osr_bci, false, directive);
2331 repeat_compilation_count--;
2332 }
2333 }
2334
2335
2336 if (!ci_env.failing() && !task->is_success()) {
2337 assert(ci_env.failure_reason() != nullptr, "expect failure reason");
2338 assert(false, "compiler should always document failure: %s", ci_env.failure_reason());
2339 // The compiler elected, without comment, not to register a result.
2340 // Do not attempt further compilations of this method.
2341 ci_env.record_method_not_compilable("compile failed");
2342 }
2343
2344 // Copy this bit to the enclosing block:
2345 compilable = ci_env.compilable();
2346
2347 if (ci_env.failing()) {
2348 // Duplicate the failure reason string, so that it outlives ciEnv
2349 failure_reason = os::strdup(ci_env.failure_reason(), mtCompiler);
2350 failure_reason_on_C_heap = true;
2351 retry_message = ci_env.retry_message();
2352 ci_env.report_failure(failure_reason);
2353 }
2354
2355 if (ci_env.failing()) {
2356 handle_compile_error(thread, task, &ci_env, compilable, failure_reason);
2357 }
2358 if (event.should_commit()) {
2359 post_compilation_event(event, task);
2360 }
2361 }
2362
2363 if (failure_reason != nullptr) {
2364 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2365 if (CompilationLog::log() != nullptr) {
2366 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message);
2367 }
2368 if (PrintCompilation || directive->PrintCompilationOption) {
2369 FormatBufferResource msg = retry_message != nullptr ?
2370 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2371 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2372 task->print(tty, msg);
2373 }
2374 }
2375
2376 DirectivesStack::release(directive);
2377
2378 methodHandle method(thread, task->method());
2379
2380 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2381
2382 collect_statistics(thread, time, task);
2383
2384 if (PrintCompilation && PrintCompilation2) {
2385 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2386 tty->print("%4d ", compile_id); // print compilation number
2387 tty->print("%s ", (is_osr ? "%" : " "));
2388 if (task->is_success()) {
2389 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size());
2390 }
2391 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2392 }
2393
2394 Log(compilation, codecache) log;
2395 if (log.is_debug()) {
2396 LogStream ls(log.debug());
2397 codecache_print(&ls, /* detailed= */ false);
2398 }
2399 if (PrintCodeCacheOnCompilation) {
2400 codecache_print(/* detailed= */ false);
2401 }
2402 // Disable compilation, if required.
2403 switch (compilable) {
2404 case ciEnv::MethodCompilable_never:
2405 if (is_osr)
2406 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2407 else
2408 method->set_not_compilable_quietly("MethodCompilable_never");
2409 break;
2410 case ciEnv::MethodCompilable_not_at_tier:
2411 if (is_osr)
2412 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2413 else
2414 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2415 break;
2416 }
2417
2418 // Note that the queued_for_compilation bits are cleared without
2419 // protection of a mutex. [They were set by the requester thread,
2420 // when adding the task to the compile queue -- at which time the
2421 // compile queue lock was held. Subsequently, we acquired the compile
2422 // queue lock to get this task off the compile queue; thus (to belabour
2423 // the point somewhat) our clearing of the bits must be occurring
2424 // only after the setting of the bits. See also 14012000 above.
2425 method->clear_queued_for_compilation();
2426 }
2427
2428 /**
2429 * The CodeCache is full. Print warning and disable compilation.
2430 * Schedule code cache cleaning so compilation can continue later.
2431 * This function needs to be called only from CodeCache::allocate(),
2432 * since we currently handle a full code cache uniformly.
2433 */
2434 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) {
2435 UseInterpreter = true;
2436 if (UseCompiler || AlwaysCompileLoopMethods ) {
2437 if (xtty != nullptr) {
2438 stringStream s;
2439 // Dump code cache state into a buffer before locking the tty,
2440 // because log_state() will use locks causing lock conflicts.
2441 CodeCache::log_state(&s);
2442 // Lock to prevent tearing
2443 ttyLocker ttyl;
2444 xtty->begin_elem("code_cache_full");
2445 xtty->print("%s", s.freeze());
2446 xtty->stamp();
2447 xtty->end_elem();
2448 }
2449
2450 #ifndef PRODUCT
2451 if (ExitOnFullCodeCache) {
2452 codecache_print(/* detailed= */ true);
2453 before_exit(JavaThread::current());
2454 exit_globals(); // will delete tty
2455 vm_direct_exit(1);
2456 }
2457 #endif
2458 if (UseCodeCacheFlushing) {
2459 // Since code cache is full, immediately stop new compiles
2460 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2461 log_info(codecache)("Code cache is full - disabling compilation");
2462 }
2463 } else {
2464 disable_compilation_forever();
2465 }
2466
2467 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2468 }
2469 }
2470
2471 // ------------------------------------------------------------------
2472 // CompileBroker::update_compile_perf_data
2473 //
2474 // Record this compilation for debugging purposes.
2475 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2476 ResourceMark rm;
2477 char* method_name = method->name()->as_C_string();
2478 char current_method[CompilerCounters::cmname_buffer_length];
2479 size_t maxLen = CompilerCounters::cmname_buffer_length;
2480
2481 const char* class_name = method->method_holder()->name()->as_C_string();
2482
2483 size_t s1len = strlen(class_name);
2484 size_t s2len = strlen(method_name);
2485
2486 // check if we need to truncate the string
2487 if (s1len + s2len + 2 > maxLen) {
2488
2489 // the strategy is to lop off the leading characters of the
2490 // class name and the trailing characters of the method name.
2491
2492 if (s2len + 2 > maxLen) {
2493 // lop of the entire class name string, let snprintf handle
2494 // truncation of the method name.
2495 class_name += s1len; // null string
2496 }
2497 else {
2498 // lop off the extra characters from the front of the class name
2499 class_name += ((s1len + s2len + 2) - maxLen);
2500 }
2501 }
2502
2503 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2504
2505 int last_compile_type = normal_compile;
2506 if (CICountOSR && is_osr) {
2507 last_compile_type = osr_compile;
2508 } else if (CICountNative && method->is_native()) {
2509 last_compile_type = native_compile;
2510 }
2511
2512 CompilerCounters* counters = thread->counters();
2513 counters->set_current_method(current_method);
2514 counters->set_compile_type((jlong) last_compile_type);
2515 }
2516
2517 // ------------------------------------------------------------------
2518 // CompileBroker::collect_statistics
2519 //
2520 // Collect statistics about the compilation.
2521
2522 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2523 bool success = task->is_success();
2524 methodHandle method (thread, task->method());
2525 int compile_id = task->compile_id();
2526 bool is_osr = (task->osr_bci() != standard_entry_bci);
2527 const int comp_level = task->comp_level();
2528 CompilerCounters* counters = thread->counters();
2529
2530 MutexLocker locker(CompileStatistics_lock);
2531
2532 // _perf variables are production performance counters which are
2533 // updated regardless of the setting of the CITime and CITimeEach flags
2534 //
2535
2536 // account all time, including bailouts and failures in this counter;
2537 // C1 and C2 counters are counting both successful and unsuccessful compiles
2538 _t_total_compilation.add(time);
2539
2540 // Update compilation times. Used by the implementation of JFR CompilerStatistics
2541 // and java.lang.management.CompilationMXBean.
2542 _perf_total_compilation->inc(time.ticks());
2543 _peak_compilation_time = MAX2(time.milliseconds(), _peak_compilation_time);
2544
2545 if (!success) {
2546 _total_bailout_count++;
2547 if (UsePerfData) {
2548 _perf_last_failed_method->set_value(counters->current_method());
2549 _perf_last_failed_type->set_value(counters->compile_type());
2550 _perf_total_bailout_count->inc();
2551 }
2552 _t_bailedout_compilation.add(time);
2553 } else if (!task->is_success()) {
2554 if (UsePerfData) {
2555 _perf_last_invalidated_method->set_value(counters->current_method());
2556 _perf_last_invalidated_type->set_value(counters->compile_type());
2557 _perf_total_invalidated_count->inc();
2558 }
2559 _total_invalidated_count++;
2560 _t_invalidated_compilation.add(time);
2561 } else {
2562 // Compilation succeeded
2563 if (CITime) {
2564 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2565 if (is_osr) {
2566 _t_osr_compilation.add(time);
2567 _sum_osr_bytes_compiled += bytes_compiled;
2568 } else {
2569 _t_standard_compilation.add(time);
2570 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2571 }
2572
2573 // Collect statistic per compilation level
2574 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2575 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2576 if (is_osr) {
2577 stats->_osr.update(time, bytes_compiled);
2578 } else {
2579 stats->_standard.update(time, bytes_compiled);
2580 }
2581 stats->_nmethods_size += task->nm_total_size();
2582 stats->_nmethods_code_size += task->nm_insts_size();
2583 } else {
2584 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2585 }
2586
2587 // Collect statistic per compiler
2588 AbstractCompiler* comp = compiler(comp_level);
2589 if (comp) {
2590 CompilerStatistics* stats = comp->stats();
2591 if (is_osr) {
2592 stats->_osr.update(time, bytes_compiled);
2593 } else {
2594 stats->_standard.update(time, bytes_compiled);
2595 }
2596 stats->_nmethods_size += task->nm_total_size();
2597 stats->_nmethods_code_size += task->nm_insts_size();
2598 } else { // if (!comp)
2599 assert(false, "Compiler object must exist");
2600 }
2601 }
2602
2603 if (UsePerfData) {
2604 // save the name of the last method compiled
2605 _perf_last_method->set_value(counters->current_method());
2606 _perf_last_compile_type->set_value(counters->compile_type());
2607 _perf_last_compile_size->set_value(method->code_size() +
2608 task->num_inlined_bytecodes());
2609 if (is_osr) {
2610 _perf_osr_compilation->inc(time.ticks());
2611 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2612 } else {
2613 _perf_standard_compilation->inc(time.ticks());
2614 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2615 }
2616 }
2617
2618 if (CITimeEach) {
2619 double compile_time = time.seconds();
2620 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2621 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2622 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2623 }
2624
2625 // Collect counts of successful compilations
2626 _sum_nmethod_size += task->nm_total_size();
2627 _sum_nmethod_code_size += task->nm_insts_size();
2628 _total_compile_count++;
2629
2630 if (UsePerfData) {
2631 _perf_sum_nmethod_size->inc( task->nm_total_size());
2632 _perf_sum_nmethod_code_size->inc(task->nm_insts_size());
2633 _perf_total_compile_count->inc();
2634 }
2635
2636 if (is_osr) {
2637 if (UsePerfData) _perf_total_osr_compile_count->inc();
2638 _total_osr_compile_count++;
2639 } else {
2640 if (UsePerfData) _perf_total_standard_compile_count->inc();
2641 _total_standard_compile_count++;
2642 }
2643 }
2644 // set the current method for the thread to null
2645 if (UsePerfData) counters->set_current_method("");
2646 }
2647
2648 const char* CompileBroker::compiler_name(int comp_level) {
2649 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2650 if (comp == nullptr) {
2651 return "no compiler";
2652 } else {
2653 return (comp->name());
2654 }
2655 }
2656
2657 jlong CompileBroker::total_compilation_ticks() {
2658 return _perf_total_compilation != nullptr ? _perf_total_compilation->get_value() : 0;
2659 }
2660
2661 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2662 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}",
2663 name, stats->bytes_per_second(),
2664 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2665 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2666 stats->_nmethods_size, stats->_nmethods_code_size);
2667 }
2668
2669 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2670 if (per_compiler) {
2671 if (aggregate) {
2672 tty->cr();
2673 tty->print_cr("Individual compiler times (for compiled methods only)");
2674 tty->print_cr("------------------------------------------------");
2675 tty->cr();
2676 }
2677 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2678 AbstractCompiler* comp = _compilers[i];
2679 if (comp != nullptr) {
2680 print_times(comp->name(), comp->stats());
2681 }
2682 }
2683 if (aggregate) {
2684 tty->cr();
2685 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2686 tty->print_cr("------------------------------------------------");
2687 tty->cr();
2688 }
2689 char tier_name[256];
2690 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2691 CompilerStatistics* stats = &_stats_per_level[tier-1];
2692 os::snprintf_checked(tier_name, sizeof(tier_name), "Tier%d", tier);
2693 print_times(tier_name, stats);
2694 }
2695 }
2696
2697 if (!aggregate) {
2698 return;
2699 }
2700
2701 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2702 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2703 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2704
2705 uint standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2706 uint osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2707
2708 uint standard_compile_count = CompileBroker::_total_standard_compile_count;
2709 uint osr_compile_count = CompileBroker::_total_osr_compile_count;
2710 uint total_compile_count = CompileBroker::_total_compile_count;
2711 uint total_bailout_count = CompileBroker::_total_bailout_count;
2712 uint total_invalidated_count = CompileBroker::_total_invalidated_count;
2713
2714 uint nmethods_code_size = CompileBroker::_sum_nmethod_code_size;
2715 uint nmethods_size = CompileBroker::_sum_nmethod_size;
2716
2717 tty->cr();
2718 tty->print_cr("Accumulated compiler times");
2719 tty->print_cr("----------------------------------------------------------");
2720 //0000000000111111111122222222223333333333444444444455555555556666666666
2721 //0123456789012345678901234567890123456789012345678901234567890123456789
2722 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2723 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2724 standard_compilation.seconds(),
2725 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2726 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2727 CompileBroker::_t_bailedout_compilation.seconds(),
2728 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2729 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2730 osr_compilation.seconds(),
2731 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2732 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2733 CompileBroker::_t_invalidated_compilation.seconds(),
2734 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2735
2736 AbstractCompiler *comp = compiler(CompLevel_simple);
2737 if (comp != nullptr) {
2738 tty->cr();
2739 comp->print_timers();
2740 }
2741 comp = compiler(CompLevel_full_optimization);
2742 if (comp != nullptr) {
2743 tty->cr();
2744 comp->print_timers();
2745 }
2746 #if INCLUDE_JVMCI
2747 if (EnableJVMCI) {
2748 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null());
2749 if (jvmci_comp != nullptr && jvmci_comp != comp) {
2750 tty->cr();
2751 jvmci_comp->print_timers();
2752 }
2753 }
2754 #endif
2755
2756 tty->cr();
2757 tty->print_cr(" Total compiled methods : %8u methods", total_compile_count);
2758 tty->print_cr(" Standard compilation : %8u methods", standard_compile_count);
2759 tty->print_cr(" On stack replacement : %8u methods", osr_compile_count);
2760 uint tcb = osr_bytes_compiled + standard_bytes_compiled;
2761 tty->print_cr(" Total compiled bytecodes : %8u bytes", tcb);
2762 tty->print_cr(" Standard compilation : %8u bytes", standard_bytes_compiled);
2763 tty->print_cr(" On stack replacement : %8u bytes", osr_bytes_compiled);
2764 double tcs = total_compilation.seconds();
2765 uint bps = tcs == 0.0 ? 0 : (uint)(tcb / tcs);
2766 tty->print_cr(" Average compilation speed : %8u bytes/s", bps);
2767 tty->cr();
2768 tty->print_cr(" nmethod code size : %8u bytes", nmethods_code_size);
2769 tty->print_cr(" nmethod total size : %8u bytes", nmethods_size);
2770 }
2771
2772 // Print general/accumulated JIT information.
2773 void CompileBroker::print_info(outputStream *out) {
2774 if (out == nullptr) out = tty;
2775 out->cr();
2776 out->print_cr("======================");
2777 out->print_cr(" General JIT info ");
2778 out->print_cr("======================");
2779 out->cr();
2780 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2781 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2782 out->cr();
2783 out->print_cr("CodeCache overview");
2784 out->print_cr("--------------------------------------------------------");
2785 out->cr();
2786 out->print_cr(" Reserved size : %7zu KB", CodeCache::max_capacity() / K);
2787 out->print_cr(" Committed size : %7zu KB", CodeCache::capacity() / K);
2788 out->print_cr(" Unallocated capacity : %7zu KB", CodeCache::unallocated_capacity() / K);
2789 out->cr();
2790 }
2791
2792 // Note: tty_lock must not be held upon entry to this function.
2793 // Print functions called from herein do "micro-locking" on tty_lock.
2794 // That's a tradeoff which keeps together important blocks of output.
2795 // At the same time, continuous tty_lock hold time is kept in check,
2796 // preventing concurrently printing threads from stalling a long time.
2797 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2798 TimeStamp ts_total;
2799 TimeStamp ts_global;
2800 TimeStamp ts;
2801
2802 bool allFun = !strcmp(function, "all");
2803 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2804 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2805 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2806 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2807 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2808 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2809 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2810 bool discard = !strcmp(function, "discard") || allFun;
2811
2812 if (out == nullptr) {
2813 out = tty;
2814 }
2815
2816 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2817 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2818 out->cr();
2819 return;
2820 }
2821
2822 ts_total.update(); // record starting point
2823
2824 if (aggregate) {
2825 print_info(out);
2826 }
2827
2828 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2829 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2830 // When we request individual parts of the analysis via the jcmd interface, it is possible
2831 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2832 // updated the aggregated data. We will then see a modified, but again consistent, view
2833 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2834 // a lock across user interaction.
2835
2836 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2837 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2838 // leading to an unnecessarily long hold time of the other locks we acquired before.
2839 ts.update(); // record starting point
2840 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2841 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2842
2843 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2844 // Unfortunately, such protection is not sufficient:
2845 // When a new nmethod is created via ciEnv::register_method(), the
2846 // Compile_lock is taken first. After some initializations,
2847 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2848 // immediately (after finalizing the oop references). To lock out concurrent
2849 // modifiers, we have to grab both locks as well in the described sequence.
2850 //
2851 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2852 // for the entire duration of aggregation and printing. That makes sure we see
2853 // a consistent picture and do not run into issues caused by concurrent alterations.
2854 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2855 !Compile_lock->owned_by_self();
2856 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2857 !CodeCache_lock->owned_by_self();
2858 bool take_global_lock_1 = allFun && should_take_Compile_lock;
2859 bool take_global_lock_2 = allFun && should_take_CodeCache_lock;
2860 bool take_function_lock_1 = !allFun && should_take_Compile_lock;
2861 bool take_function_lock_2 = !allFun && should_take_CodeCache_lock;
2862 bool take_global_locks = take_global_lock_1 || take_global_lock_2;
2863 bool take_function_locks = take_function_lock_1 || take_function_lock_2;
2864
2865 ts_global.update(); // record starting point
2866
2867 ConditionalMutexLocker mu1(Compile_lock, take_global_lock_1, Mutex::_safepoint_check_flag);
2868 ConditionalMutexLocker mu2(CodeCache_lock, take_global_lock_2, Mutex::_no_safepoint_check_flag);
2869 if (take_global_locks) {
2870 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2871 ts_global.update(); // record starting point
2872 }
2873
2874 if (aggregate) {
2875 ts.update(); // record starting point
2876 ConditionalMutexLocker mu11(Compile_lock, take_function_lock_1, Mutex::_safepoint_check_flag);
2877 ConditionalMutexLocker mu22(CodeCache_lock, take_function_lock_2, Mutex::_no_safepoint_check_flag);
2878 if (take_function_locks) {
2879 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2880 }
2881
2882 ts.update(); // record starting point
2883 CodeCache::aggregate(out, granularity);
2884 if (take_function_locks) {
2885 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2886 }
2887 }
2888
2889 if (usedSpace) CodeCache::print_usedSpace(out);
2890 if (freeSpace) CodeCache::print_freeSpace(out);
2891 if (methodCount) CodeCache::print_count(out);
2892 if (methodSpace) CodeCache::print_space(out);
2893 if (methodAge) CodeCache::print_age(out);
2894 if (methodNames) {
2895 if (allFun) {
2896 // print_names() can only be used safely if the locks have been continuously held
2897 // since aggregation begin. That is true only for function "all".
2898 CodeCache::print_names(out);
2899 } else {
2900 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2901 }
2902 }
2903 if (discard) CodeCache::discard(out);
2904
2905 if (take_global_locks) {
2906 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2907 }
2908 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2909 }