1 /*
2 * Copyright (c) 1999, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "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 "jvm.h"
44 #include "jfr/jfrEvents.hpp"
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/methodData.hpp"
51 #include "oops/method.inline.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 // Notify CompilerThreads that a task is available.
352 MethodCompileQueue_lock->notify_all();
353 }
354
355 /**
356 * Empties compilation queue by putting all compilation tasks onto
357 * a freelist. Furthermore, the method wakes up all threads that are
358 * waiting on a compilation task to finish. This can happen if background
359 * compilation is disabled.
360 */
361 void CompileQueue::free_all() {
362 MutexLocker mu(MethodCompileQueue_lock);
363 CompileTask* next = _first;
364
365 // Iterate over all tasks in the compile queue
366 while (next != nullptr) {
367 CompileTask* current = next;
368 next = current->next();
369 {
370 // Wake up thread that blocks on the compile task.
371 MutexLocker ct_lock(current->lock());
372 current->lock()->notify();
373 }
374 // Put the task back on the freelist.
375 CompileTask::free(current);
376 }
377 _first = nullptr;
378 _last = nullptr;
379
380 // Wake up all threads that block on the queue.
381 MethodCompileQueue_lock->notify_all();
382 }
383
384 /**
385 * Get the next CompileTask from a CompileQueue
386 */
387 CompileTask* CompileQueue::get(CompilerThread* thread) {
388 // save methods from RedefineClasses across safepoint
389 // across MethodCompileQueue_lock below.
390 methodHandle save_method;
391 methodHandle save_hot_method;
392
393 MonitorLocker locker(MethodCompileQueue_lock);
394 // If _first is null we have no more compile jobs. There are two reasons for
395 // having no compile jobs: First, we compiled everything we wanted. Second,
396 // we ran out of code cache so compilation has been disabled. In the latter
397 // case we perform code cache sweeps to free memory such that we can re-enable
398 // compilation.
399 while (_first == nullptr) {
400 // Exit loop if compilation is disabled forever
401 if (CompileBroker::is_compilation_disabled_forever()) {
402 return nullptr;
403 }
404
405 AbstractCompiler* compiler = thread->compiler();
406 guarantee(compiler != nullptr, "Compiler object must exist");
407 compiler->on_empty_queue(this, thread);
408 if (_first != nullptr) {
409 // The call to on_empty_queue may have temporarily unlocked the MCQ lock
410 // so check again whether any tasks were added to the queue.
411 break;
412 }
413
414 // If there are no compilation tasks and we can compile new jobs
415 // (i.e., there is enough free space in the code cache) there is
416 // no need to invoke the GC.
417 // We need a timed wait here, since compiler threads can exit if compilation
418 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
419 // is not critical and we do not want idle compiler threads to wake up too often.
420 locker.wait(5*1000);
421
422 if (UseDynamicNumberOfCompilerThreads && _first == nullptr) {
423 // Still nothing to compile. Give caller a chance to stop this thread.
424 if (CompileBroker::can_remove(CompilerThread::current(), false)) return nullptr;
425 }
426 }
427
428 if (CompileBroker::is_compilation_disabled_forever()) {
429 return nullptr;
430 }
431
432 CompileTask* task;
433 {
434 NoSafepointVerifier nsv;
435 task = CompilationPolicy::select_task(this);
436 if (task != nullptr) {
437 task = task->select_for_compilation();
438 }
439 }
440
441 if (task != nullptr) {
442 // Save method pointers across unlock safepoint. The task is removed from
443 // the compilation queue, which is walked during RedefineClasses.
444 Thread* thread = Thread::current();
445 save_method = methodHandle(thread, task->method());
446 save_hot_method = methodHandle(thread, task->hot_method());
447
448 remove(task);
449 }
450 purge_stale_tasks(); // may temporarily release MCQ lock
451 return task;
452 }
453
454 // Clean & deallocate stale compile tasks.
455 // Temporarily releases MethodCompileQueue lock.
456 void CompileQueue::purge_stale_tasks() {
457 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
458 if (_first_stale != nullptr) {
459 // Stale tasks are purged when MCQ lock is released,
460 // but _first_stale updates are protected by MCQ lock.
461 // Once task processing starts and MCQ lock is released,
462 // other compiler threads can reuse _first_stale.
463 CompileTask* head = _first_stale;
464 _first_stale = nullptr;
465 {
466 MutexUnlocker ul(MethodCompileQueue_lock);
467 for (CompileTask* task = head; task != nullptr; ) {
468 CompileTask* next_task = task->next();
469 CompileTaskWrapper ctw(task); // Frees the task
470 task->set_failure_reason("stale task");
471 task = next_task;
472 }
473 }
474 }
475 }
476
477 void CompileQueue::remove(CompileTask* task) {
478 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
479 if (task->prev() != nullptr) {
480 task->prev()->set_next(task->next());
481 } else {
482 // max is the first element
483 assert(task == _first, "Sanity");
484 _first = task->next();
485 }
486
487 if (task->next() != nullptr) {
488 task->next()->set_prev(task->prev());
489 } else {
490 // max is the last element
491 assert(task == _last, "Sanity");
492 _last = task->prev();
493 }
494 --_size;
495 ++_total_removed;
496 }
497
498 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
499 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
500 remove(task);
501
502 // Enqueue the task for reclamation (should be done outside MCQ lock)
503 task->set_next(_first_stale);
504 task->set_prev(nullptr);
505 _first_stale = task;
506 }
507
508 // methods in the compile queue need to be marked as used on the stack
509 // so that they don't get reclaimed by Redefine Classes
510 void CompileQueue::mark_on_stack() {
511 CompileTask* task = _first;
512 while (task != nullptr) {
513 task->mark_on_stack();
514 task = task->next();
515 }
516 }
517
518
519 CompileQueue* CompileBroker::compile_queue(int comp_level) {
520 if (is_c2_compile(comp_level)) return _c2_compile_queue;
521 if (is_c1_compile(comp_level)) return _c1_compile_queue;
522 return nullptr;
523 }
524
525 CompileQueue* CompileBroker::c1_compile_queue() {
526 return _c1_compile_queue;
527 }
528
529 CompileQueue* CompileBroker::c2_compile_queue() {
530 return _c2_compile_queue;
531 }
532
533 void CompileBroker::print_compile_queues(outputStream* st) {
534 st->print_cr("Current compiles: ");
535
536 char buf[2000];
537 int buflen = sizeof(buf);
538 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
539
540 st->cr();
541 if (_c1_compile_queue != nullptr) {
542 _c1_compile_queue->print(st);
543 }
544 if (_c2_compile_queue != nullptr) {
545 _c2_compile_queue->print(st);
546 }
547 }
548
549 void CompileQueue::print(outputStream* st) {
550 assert_locked_or_safepoint(MethodCompileQueue_lock);
551 st->print_cr("%s:", name());
552 CompileTask* task = _first;
553 if (task == nullptr) {
554 st->print_cr("Empty");
555 } else {
556 while (task != nullptr) {
557 task->print(st, nullptr, true, true);
558 task = task->next();
559 }
560 }
561 st->cr();
562 }
563
564 void CompileQueue::print_tty() {
565 stringStream ss;
566 // Dump the compile queue into a buffer before locking the tty
567 print(&ss);
568 {
569 ttyLocker ttyl;
570 tty->print("%s", ss.freeze());
571 }
572 }
573
574 CompilerCounters::CompilerCounters() {
575 _current_method[0] = '\0';
576 _compile_type = CompileBroker::no_compile;
577 }
578
579 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
580 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
581 // in compiler/compilerEvent.cpp) and registers it with its serializer.
582 //
583 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
584 // so if c2 is used, it should be always registered first.
585 // This function is called during vm initialization.
586 static void register_jfr_phasetype_serializer(CompilerType compiler_type) {
587 ResourceMark rm;
588 static bool first_registration = true;
589 if (compiler_type == compiler_jvmci) {
590 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
591 first_registration = false;
592 #ifdef COMPILER2
593 } else if (compiler_type == compiler_c2) {
594 assert(first_registration, "invariant"); // c2 must be registered first.
595 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
596 const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i);
597 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
598 }
599 first_registration = false;
600 #endif // COMPILER2
601 }
602 }
603 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
604
605 // ------------------------------------------------------------------
606 // CompileBroker::compilation_init
607 //
608 // Initialize the Compilation object
609 void CompileBroker::compilation_init(JavaThread* THREAD) {
610 // No need to initialize compilation system if we do not use it.
611 if (!UseCompiler) {
612 return;
613 }
614 // Set the interface to the current compiler(s).
615 _c1_count = CompilationPolicy::c1_count();
616 _c2_count = CompilationPolicy::c2_count();
617
618 #if INCLUDE_JVMCI
619 if (EnableJVMCI) {
620 // This is creating a JVMCICompiler singleton.
621 JVMCICompiler* jvmci = new JVMCICompiler();
622
623 if (UseJVMCICompiler) {
624 _compilers[1] = jvmci;
625 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
626 if (BootstrapJVMCI) {
627 // JVMCI will bootstrap so give it more threads
628 _c2_count = MIN2(32, os::active_processor_count());
629 }
630 } else {
631 _c2_count = JVMCIThreads;
632 }
633 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
634 } else {
635 #ifdef COMPILER1
636 _c1_count = JVMCIHostThreads;
637 #endif // COMPILER1
638 }
639 }
640 }
641 #endif // INCLUDE_JVMCI
642
643 #ifdef COMPILER1
644 if (_c1_count > 0) {
645 _compilers[0] = new Compiler();
646 }
647 #endif // COMPILER1
648
649 #ifdef COMPILER2
650 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
651 if (_c2_count > 0) {
652 _compilers[1] = new C2Compiler();
653 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
654 // idToPhase mapping for c2 is in opto/phasetype.hpp
655 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
656 }
657 }
658 #endif // COMPILER2
659
660 #if INCLUDE_JVMCI
661 // Register after c2 registration.
662 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
663 if (EnableJVMCI) {
664 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
665 }
666 #endif // INCLUDE_JVMCI
667
668 if (CompilerOracle::should_collect_memstat()) {
669 CompilationMemoryStatistic::initialize();
670 }
671
672 // Start the compiler thread(s)
673 init_compiler_threads();
674 // totalTime performance counter is always created as it is required
675 // by the implementation of java.lang.management.CompilationMXBean.
676 {
677 // Ensure OOM leads to vm_exit_during_initialization.
678 EXCEPTION_MARK;
679 _perf_total_compilation =
680 PerfDataManager::create_counter(JAVA_CI, "totalTime",
681 PerfData::U_Ticks, CHECK);
682 }
683
684 if (UsePerfData) {
685
686 EXCEPTION_MARK;
687
688 // create the jvmstat performance counters
689 _perf_osr_compilation =
690 PerfDataManager::create_counter(SUN_CI, "osrTime",
691 PerfData::U_Ticks, CHECK);
692
693 _perf_standard_compilation =
694 PerfDataManager::create_counter(SUN_CI, "standardTime",
695 PerfData::U_Ticks, CHECK);
696
697 _perf_total_bailout_count =
698 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
699 PerfData::U_Events, CHECK);
700
701 _perf_total_invalidated_count =
702 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
703 PerfData::U_Events, CHECK);
704
705 _perf_total_compile_count =
706 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
707 PerfData::U_Events, CHECK);
708 _perf_total_osr_compile_count =
709 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
710 PerfData::U_Events, CHECK);
711
712 _perf_total_standard_compile_count =
713 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
714 PerfData::U_Events, CHECK);
715
716 _perf_sum_osr_bytes_compiled =
717 PerfDataManager::create_counter(SUN_CI, "osrBytes",
718 PerfData::U_Bytes, CHECK);
719
720 _perf_sum_standard_bytes_compiled =
721 PerfDataManager::create_counter(SUN_CI, "standardBytes",
722 PerfData::U_Bytes, CHECK);
723
724 _perf_sum_nmethod_size =
725 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
726 PerfData::U_Bytes, CHECK);
727
728 _perf_sum_nmethod_code_size =
729 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
730 PerfData::U_Bytes, CHECK);
731
732 _perf_last_method =
733 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
734 CompilerCounters::cmname_buffer_length,
735 "", CHECK);
736
737 _perf_last_failed_method =
738 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
739 CompilerCounters::cmname_buffer_length,
740 "", CHECK);
741
742 _perf_last_invalidated_method =
743 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
744 CompilerCounters::cmname_buffer_length,
745 "", CHECK);
746
747 _perf_last_compile_type =
748 PerfDataManager::create_variable(SUN_CI, "lastType",
749 PerfData::U_None,
750 (jlong)CompileBroker::no_compile,
751 CHECK);
752
753 _perf_last_compile_size =
754 PerfDataManager::create_variable(SUN_CI, "lastSize",
755 PerfData::U_Bytes,
756 (jlong)CompileBroker::no_compile,
757 CHECK);
758
759
760 _perf_last_failed_type =
761 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
762 PerfData::U_None,
763 (jlong)CompileBroker::no_compile,
764 CHECK);
765
766 _perf_last_invalidated_type =
767 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
768 PerfData::U_None,
769 (jlong)CompileBroker::no_compile,
770 CHECK);
771 }
772
773 _initialized = true;
774 }
775
776 #if defined(ASSERT) && COMPILER2_OR_JVMCI
777 // Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to
778 // the running java application. Configured with vm options DeoptimizeObjectsALot*.
779 class DeoptimizeObjectsALotThread : public JavaThread {
780
781 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS);
782 void deoptimize_objects_alot_loop_single();
783 void deoptimize_objects_alot_loop_all();
784
785 public:
786 DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { }
787
788 bool is_hidden_from_external_view() const { return true; }
789 };
790
791 // Entry for DeoptimizeObjectsALotThread. The threads are started in
792 // CompileBroker::init_compiler_threads() iff DeoptimizeObjectsALot is enabled
793 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
794 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
795 bool enter_single_loop;
796 {
797 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
798 static int single_thread_count = 0;
799 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
800 }
801 if (enter_single_loop) {
802 dt->deoptimize_objects_alot_loop_single();
803 } else {
804 dt->deoptimize_objects_alot_loop_all();
805 }
806 }
807
808 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
809 // barrier targets a single thread which is selected round robin.
810 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
811 HandleMark hm(this);
812 while (true) {
813 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
814 { // Begin new scope for escape barrier
815 HandleMarkCleaner hmc(this);
816 ResourceMark rm(this);
817 EscapeBarrier eb(true, this, deoptee_thread);
818 eb.deoptimize_objects(100);
819 }
820 // Now sleep after the escape barriers destructor resumed deoptee_thread.
821 sleep(DeoptimizeObjectsALotInterval);
822 }
823 }
824 }
825
826 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
827 // barrier targets all java threads in the vm at once.
828 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
829 HandleMark hm(this);
830 while (true) {
831 { // Begin new scope for escape barrier
832 HandleMarkCleaner hmc(this);
833 ResourceMark rm(this);
834 EscapeBarrier eb(true, this);
835 eb.deoptimize_objects_all_threads();
836 }
837 // Now sleep after the escape barriers destructor resumed the java threads.
838 sleep(DeoptimizeObjectsALotInterval);
839 }
840 }
841 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
842
843
844 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
845 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
846
847 if (java_lang_Thread::thread(thread_oop()) != nullptr) {
848 assert(type == compiler_t, "should only happen with reused compiler threads");
849 // The compiler thread hasn't actually exited yet so don't try to reuse it
850 return nullptr;
851 }
852
853 JavaThread* new_thread = nullptr;
854 switch (type) {
855 case compiler_t:
856 assert(comp != nullptr, "Compiler instance missing.");
857 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
858 CompilerCounters* counters = new CompilerCounters();
859 new_thread = new CompilerThread(queue, counters);
860 }
861 break;
862 #if defined(ASSERT) && COMPILER2_OR_JVMCI
863 case deoptimizer_t:
864 new_thread = new DeoptimizeObjectsALotThread();
865 break;
866 #endif // ASSERT
867 default:
868 ShouldNotReachHere();
869 }
870
871 // At this point the new CompilerThread data-races with this startup
872 // thread (which is the main thread and NOT the VM thread).
873 // This means Java bytecodes being executed at startup can
874 // queue compile jobs which will run at whatever default priority the
875 // newly created CompilerThread runs at.
876
877
878 // At this point it may be possible that no osthread was created for the
879 // JavaThread due to lack of resources. We will handle that failure below.
880 // Also check new_thread so that static analysis is happy.
881 if (new_thread != nullptr && new_thread->osthread() != nullptr) {
882
883 if (type == compiler_t) {
884 CompilerThread::cast(new_thread)->set_compiler(comp);
885 }
886
887 // Note that we cannot call os::set_priority because it expects Java
888 // priorities and we are *explicitly* using OS priorities so that it's
889 // possible to set the compiler thread priority higher than any Java
890 // thread.
891
892 int native_prio = CompilerThreadPriority;
893 if (native_prio == -1) {
894 if (UseCriticalCompilerThreadPriority) {
895 native_prio = os::java_to_os_priority[CriticalPriority];
896 } else {
897 native_prio = os::java_to_os_priority[NearMaxPriority];
898 }
899 }
900 os::set_native_priority(new_thread, native_prio);
901
902 // Note that this only sets the JavaThread _priority field, which by
903 // definition is limited to Java priorities and not OS priorities.
904 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
905
906 } else { // osthread initialization failure
907 if (UseDynamicNumberOfCompilerThreads && type == compiler_t
908 && comp->num_compiler_threads() > 0) {
909 // The new thread is not known to Thread-SMR yet so we can just delete.
910 delete new_thread;
911 return nullptr;
912 } else {
913 vm_exit_during_initialization("java.lang.OutOfMemoryError",
914 os::native_thread_creation_failed_msg());
915 }
916 }
917
918 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
919
920 return new_thread;
921 }
922
923 static bool trace_compiler_threads() {
924 LogTarget(Debug, jit, thread) lt;
925 return TraceCompilerThreads || lt.is_enabled();
926 }
927
928 static jobject create_compiler_thread(AbstractCompiler* compiler, int i, TRAPS) {
929 char name_buffer[256];
930 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", compiler->name(), i);
931 Handle thread_oop = JavaThread::create_system_thread_object(name_buffer, CHECK_NULL);
932 return JNIHandles::make_global(thread_oop);
933 }
934
935 static void print_compiler_threads(stringStream& msg) {
936 if (TraceCompilerThreads) {
937 tty->print_cr("%7d %s", (int)tty->time_stamp().milliseconds(), msg.as_string());
938 }
939 LogTarget(Debug, jit, thread) lt;
940 if (lt.is_enabled()) {
941 LogStream ls(lt);
942 ls.print_cr("%s", msg.as_string());
943 }
944 }
945
946 void CompileBroker::init_compiler_threads() {
947 // Ensure any exceptions lead to vm_exit_during_initialization.
948 EXCEPTION_MARK;
949 #if !defined(ZERO)
950 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
951 #endif // !ZERO
952 // Initialize the compilation queue
953 if (_c2_count > 0) {
954 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
955 _c2_compile_queue = new CompileQueue(name);
956 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
957 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
958 }
959 if (_c1_count > 0) {
960 _c1_compile_queue = new CompileQueue("C1 compile queue");
961 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
962 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
963 }
964
965 for (int i = 0; i < _c2_count; i++) {
966 // Create a name for our thread.
967 jobject thread_handle = create_compiler_thread(_compilers[1], i, CHECK);
968 _compiler2_objects[i] = thread_handle;
969 _compiler2_logs[i] = nullptr;
970
971 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
972 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
973 assert(ct != nullptr, "should have been handled for initial thread");
974 _compilers[1]->set_num_compiler_threads(i + 1);
975 if (trace_compiler_threads()) {
976 ResourceMark rm;
977 ThreadsListHandle tlh; // name() depends on the TLH.
978 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
979 stringStream msg;
980 msg.print("Added initial compiler thread %s", ct->name());
981 print_compiler_threads(msg);
982 }
983 }
984 }
985
986 for (int i = 0; i < _c1_count; i++) {
987 // Create a name for our thread.
988 jobject thread_handle = create_compiler_thread(_compilers[0], i, CHECK);
989 _compiler1_objects[i] = thread_handle;
990 _compiler1_logs[i] = nullptr;
991
992 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
993 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
994 assert(ct != nullptr, "should have been handled for initial thread");
995 _compilers[0]->set_num_compiler_threads(i + 1);
996 if (trace_compiler_threads()) {
997 ResourceMark rm;
998 ThreadsListHandle tlh; // name() depends on the TLH.
999 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1000 stringStream msg;
1001 msg.print("Added initial compiler thread %s", ct->name());
1002 print_compiler_threads(msg);
1003 }
1004 }
1005 }
1006
1007 if (UsePerfData) {
1008 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
1009 }
1010
1011 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1012 if (DeoptimizeObjectsALot) {
1013 // Initialize and start the object deoptimizer threads
1014 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1015 for (int count = 0; count < total_count; count++) {
1016 Handle thread_oop = JavaThread::create_system_thread_object("Deoptimize objects a lot single mode", CHECK);
1017 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1018 make_thread(deoptimizer_t, thread_handle, nullptr, nullptr, THREAD);
1019 }
1020 }
1021 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1022 }
1023
1024 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
1025
1026 int old_c2_count = 0, new_c2_count = 0, old_c1_count = 0, new_c1_count = 0;
1027 const int c2_tasks_per_thread = 2, c1_tasks_per_thread = 4;
1028
1029 // Quick check if we already have enough compiler threads without taking the lock.
1030 // Numbers may change concurrently, so we read them again after we have the lock.
1031 if (_c2_compile_queue != nullptr) {
1032 old_c2_count = get_c2_thread_count();
1033 new_c2_count = MIN2(_c2_count, _c2_compile_queue->size() / c2_tasks_per_thread);
1034 }
1035 if (_c1_compile_queue != nullptr) {
1036 old_c1_count = get_c1_thread_count();
1037 new_c1_count = MIN2(_c1_count, _c1_compile_queue->size() / c1_tasks_per_thread);
1038 }
1039 if (new_c2_count <= old_c2_count && new_c1_count <= old_c1_count) return;
1040
1041 // Now, we do the more expensive operations.
1042 julong free_memory = os::free_memory();
1043 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1044 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1045 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1046
1047 // Only attempt to start additional threads if the lock is free.
1048 if (!CompileThread_lock->try_lock()) return;
1049
1050 if (_c2_compile_queue != nullptr) {
1051 old_c2_count = get_c2_thread_count();
1052 new_c2_count = MIN4(_c2_count,
1053 _c2_compile_queue->size() / c2_tasks_per_thread,
1054 (int)(free_memory / (200*M)),
1055 (int)(available_cc_np / (128*K)));
1056
1057 for (int i = old_c2_count; i < new_c2_count; i++) {
1058 #if INCLUDE_JVMCI
1059 if (UseJVMCICompiler && !UseJVMCINativeLibrary && _compiler2_objects[i] == nullptr) {
1060 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread objects as their
1061 // existence is completely hidden from the rest of the VM (and those compiler threads can't
1062 // call Java code to do the creation anyway).
1063 //
1064 // For pure Java JVMCI we have to create new j.l.Thread objects as they are visible and we
1065 // can see unexpected thread lifecycle transitions if we bind them to new JavaThreads. For
1066 // native library JVMCI it's preferred to use the C1/C2 strategy as this avoids unnecessary
1067 // coupling with Java.
1068 if (!THREAD->can_call_java()) break;
1069 char name_buffer[256];
1070 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i);
1071 Handle thread_oop;
1072 {
1073 // We have to give up the lock temporarily for the Java calls.
1074 MutexUnlocker mu(CompileThread_lock);
1075 thread_oop = JavaThread::create_system_thread_object(name_buffer, THREAD);
1076 }
1077 if (HAS_PENDING_EXCEPTION) {
1078 if (trace_compiler_threads()) {
1079 ResourceMark rm;
1080 stringStream msg;
1081 msg.print_cr("JVMCI compiler thread creation failed:");
1082 PENDING_EXCEPTION->print_on(&msg);
1083 print_compiler_threads(msg);
1084 }
1085 CLEAR_PENDING_EXCEPTION;
1086 break;
1087 }
1088 // Check if another thread has beaten us during the Java calls.
1089 if (get_c2_thread_count() != i) break;
1090 jobject thread_handle = JNIHandles::make_global(thread_oop);
1091 assert(compiler2_object(i) == nullptr, "Old one must be released!");
1092 _compiler2_objects[i] = thread_handle;
1093 }
1094 #endif
1095 guarantee(compiler2_object(i) != nullptr, "Thread oop must exist");
1096 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1097 if (ct == nullptr) break;
1098 _compilers[1]->set_num_compiler_threads(i + 1);
1099 if (trace_compiler_threads()) {
1100 ResourceMark rm;
1101 ThreadsListHandle tlh; // name() depends on the TLH.
1102 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1103 stringStream msg;
1104 msg.print("Added compiler thread %s (free memory: %dMB, available non-profiled code cache: %dMB)",
1105 ct->name(), (int)(free_memory/M), (int)(available_cc_np/M));
1106 print_compiler_threads(msg);
1107 }
1108 }
1109 }
1110
1111 if (_c1_compile_queue != nullptr) {
1112 old_c1_count = get_c1_thread_count();
1113 new_c1_count = MIN4(_c1_count,
1114 _c1_compile_queue->size() / c1_tasks_per_thread,
1115 (int)(free_memory / (100*M)),
1116 (int)(available_cc_p / (128*K)));
1117
1118 for (int i = old_c1_count; i < new_c1_count; i++) {
1119 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1120 if (ct == nullptr) break;
1121 _compilers[0]->set_num_compiler_threads(i + 1);
1122 if (trace_compiler_threads()) {
1123 ResourceMark rm;
1124 ThreadsListHandle tlh; // name() depends on the TLH.
1125 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1126 stringStream msg;
1127 msg.print("Added compiler thread %s (free memory: %dMB, available profiled code cache: %dMB)",
1128 ct->name(), (int)(free_memory/M), (int)(available_cc_p/M));
1129 print_compiler_threads(msg);
1130 }
1131 }
1132 }
1133
1134 CompileThread_lock->unlock();
1135 }
1136
1137
1138 /**
1139 * Set the methods on the stack as on_stack so that redefine classes doesn't
1140 * reclaim them. This method is executed at a safepoint.
1141 */
1142 void CompileBroker::mark_on_stack() {
1143 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1144 // Since we are at a safepoint, we do not need a lock to access
1145 // the compile queues.
1146 if (_c2_compile_queue != nullptr) {
1147 _c2_compile_queue->mark_on_stack();
1148 }
1149 if (_c1_compile_queue != nullptr) {
1150 _c1_compile_queue->mark_on_stack();
1151 }
1152 }
1153
1154 // ------------------------------------------------------------------
1155 // CompileBroker::compile_method
1156 //
1157 // Request compilation of a method.
1158 void CompileBroker::compile_method_base(const methodHandle& method,
1159 int osr_bci,
1160 int comp_level,
1161 const methodHandle& hot_method,
1162 int hot_count,
1163 CompileTask::CompileReason compile_reason,
1164 bool blocking,
1165 Thread* thread) {
1166 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1167 assert(method->method_holder()->is_instance_klass(),
1168 "sanity check");
1169 assert(!method->method_holder()->is_not_initialized(),
1170 "method holder must be initialized");
1171 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1172
1173 if (CIPrintRequests) {
1174 tty->print("request: ");
1175 method->print_short_name(tty);
1176 if (osr_bci != InvocationEntryBci) {
1177 tty->print(" osr_bci: %d", osr_bci);
1178 }
1179 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1180 if (!hot_method.is_null()) {
1181 tty->print(" hot: ");
1182 if (hot_method() != method()) {
1183 hot_method->print_short_name(tty);
1184 } else {
1185 tty->print("yes");
1186 }
1187 }
1188 tty->cr();
1189 }
1190
1191 // A request has been made for compilation. Before we do any
1192 // real work, check to see if the method has been compiled
1193 // in the meantime with a definitive result.
1194 if (compilation_is_complete(method, osr_bci, comp_level)) {
1195 return;
1196 }
1197
1198 #ifndef PRODUCT
1199 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1200 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1201 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1202 return;
1203 }
1204 }
1205 #endif
1206
1207 // If this method is already in the compile queue, then
1208 // we do not block the current thread.
1209 if (compilation_is_in_queue(method)) {
1210 // We may want to decay our counter a bit here to prevent
1211 // multiple denied requests for compilation. This is an
1212 // open compilation policy issue. Note: The other possibility,
1213 // in the case that this is a blocking compile request, is to have
1214 // all subsequent blocking requesters wait for completion of
1215 // ongoing compiles. Note that in this case we'll need a protocol
1216 // for freeing the associated compile tasks. [Or we could have
1217 // a single static monitor on which all these waiters sleep.]
1218 return;
1219 }
1220
1221 // Tiered policy requires MethodCounters to exist before adding a method to
1222 // the queue. Create if we don't have them yet.
1223 method->get_method_counters(thread);
1224
1225 // Outputs from the following MutexLocker block:
1226 CompileTask* task = nullptr;
1227 CompileQueue* queue = compile_queue(comp_level);
1228
1229 // Acquire our lock.
1230 {
1231 MutexLocker locker(thread, MethodCompileQueue_lock);
1232
1233 // Make sure the method has not slipped into the queues since
1234 // last we checked; note that those checks were "fast bail-outs".
1235 // Here we need to be more careful, see 14012000 below.
1236 if (compilation_is_in_queue(method)) {
1237 return;
1238 }
1239
1240 // We need to check again to see if the compilation has
1241 // completed. A previous compilation may have registered
1242 // some result.
1243 if (compilation_is_complete(method, osr_bci, comp_level)) {
1244 return;
1245 }
1246
1247 // We now know that this compilation is not pending, complete,
1248 // or prohibited. Assign a compile_id to this compilation
1249 // and check to see if it is in our [Start..Stop) range.
1250 int compile_id = assign_compile_id(method, osr_bci);
1251 if (compile_id == 0) {
1252 // The compilation falls outside the allowed range.
1253 return;
1254 }
1255
1256 #if INCLUDE_JVMCI
1257 if (UseJVMCICompiler && blocking) {
1258 // Don't allow blocking compiles for requests triggered by JVMCI.
1259 if (thread->is_Compiler_thread()) {
1260 blocking = false;
1261 }
1262
1263 // In libjvmci, JVMCI initialization should not deadlock with other threads
1264 if (!UseJVMCINativeLibrary) {
1265 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1266 vframeStream vfst(JavaThread::cast(thread));
1267 for (; !vfst.at_end(); vfst.next()) {
1268 if (vfst.method()->is_class_initializer() ||
1269 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1270 vfst.method()->name() == vmSymbols::loadClass_name())) {
1271 blocking = false;
1272 break;
1273 }
1274 }
1275
1276 // Don't allow blocking compilation requests to JVMCI
1277 // if JVMCI itself is not yet initialized
1278 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1279 blocking = false;
1280 }
1281 }
1282
1283 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1284 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1285 // such as the DestroyJavaVM thread.
1286 if (JVMCI::in_shutdown()) {
1287 blocking = false;
1288 }
1289 }
1290 #endif // INCLUDE_JVMCI
1291
1292 // We will enter the compilation in the queue.
1293 // 14012000: Note that this sets the queued_for_compile bits in
1294 // the target method. We can now reason that a method cannot be
1295 // queued for compilation more than once, as follows:
1296 // Before a thread queues a task for compilation, it first acquires
1297 // the compile queue lock, then checks if the method's queued bits
1298 // are set or it has already been compiled. Thus there can not be two
1299 // instances of a compilation task for the same method on the
1300 // compilation queue. Consider now the case where the compilation
1301 // thread has already removed a task for that method from the queue
1302 // and is in the midst of compiling it. In this case, the
1303 // queued_for_compile bits must be set in the method (and these
1304 // will be visible to the current thread, since the bits were set
1305 // under protection of the compile queue lock, which we hold now.
1306 // When the compilation completes, the compiler thread first sets
1307 // the compilation result and then clears the queued_for_compile
1308 // bits. Neither of these actions are protected by a barrier (or done
1309 // under the protection of a lock), so the only guarantee we have
1310 // (on machines with TSO (Total Store Order)) is that these values
1311 // will update in that order. As a result, the only combinations of
1312 // these bits that the current thread will see are, in temporal order:
1313 // <RESULT, QUEUE> :
1314 // <0, 1> : in compile queue, but not yet compiled
1315 // <1, 1> : compiled but queue bit not cleared
1316 // <1, 0> : compiled and queue bit cleared
1317 // Because we first check the queue bits then check the result bits,
1318 // we are assured that we cannot introduce a duplicate task.
1319 // Note that if we did the tests in the reverse order (i.e. check
1320 // result then check queued bit), we could get the result bit before
1321 // the compilation completed, and the queue bit after the compilation
1322 // completed, and end up introducing a "duplicate" (redundant) task.
1323 // In that case, the compiler thread should first check if a method
1324 // has already been compiled before trying to compile it.
1325 // NOTE: in the event that there are multiple compiler threads and
1326 // there is de-optimization/recompilation, things will get hairy,
1327 // and in that case it's best to protect both the testing (here) of
1328 // these bits, and their updating (here and elsewhere) under a
1329 // common lock.
1330 task = create_compile_task(queue,
1331 compile_id, method,
1332 osr_bci, comp_level,
1333 hot_method, hot_count, compile_reason,
1334 blocking);
1335 }
1336
1337 if (blocking) {
1338 wait_for_completion(task);
1339 }
1340 }
1341
1342 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1343 int comp_level,
1344 const methodHandle& hot_method, int hot_count,
1345 CompileTask::CompileReason compile_reason,
1346 TRAPS) {
1347 // Do nothing if compilebroker is not initialized or compiles are submitted on level none
1348 if (!_initialized || comp_level == CompLevel_none) {
1349 return nullptr;
1350 }
1351
1352 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1353 assert(comp != nullptr, "Ensure we have a compiler");
1354
1355 #if INCLUDE_JVMCI
1356 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1357 // JVMCI compilation is not yet initializable.
1358 return nullptr;
1359 }
1360 #endif
1361
1362 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1363 // CompileBroker::compile_method can trap and can have pending async exception.
1364 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1365 DirectivesStack::release(directive);
1366 return nm;
1367 }
1368
1369 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1370 int comp_level,
1371 const methodHandle& hot_method, int hot_count,
1372 CompileTask::CompileReason compile_reason,
1373 DirectiveSet* directive,
1374 TRAPS) {
1375
1376 // make sure arguments make sense
1377 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1378 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1379 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1380 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1381 // return quickly if possible
1382
1383 // lock, make sure that the compilation
1384 // isn't prohibited in a straightforward way.
1385 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1386 if (comp == nullptr || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1387 return nullptr;
1388 }
1389
1390 if (osr_bci == InvocationEntryBci) {
1391 // standard compilation
1392 nmethod* method_code = method->code();
1393 if (method_code != nullptr) {
1394 if (compilation_is_complete(method, osr_bci, comp_level)) {
1395 return method_code;
1396 }
1397 }
1398 if (method->is_not_compilable(comp_level)) {
1399 return nullptr;
1400 }
1401 } else {
1402 // osr compilation
1403 // We accept a higher level osr method
1404 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1405 if (nm != nullptr) return nm;
1406 if (method->is_not_osr_compilable(comp_level)) return nullptr;
1407 }
1408
1409 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1410 // some prerequisites that are compiler specific
1411 if (comp->is_c2() || comp->is_jvmci()) {
1412 InternalOOMEMark iom(THREAD);
1413 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1414 // Resolve all classes seen in the signature of the method
1415 // we are compiling.
1416 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1417 }
1418
1419 // If the method is native, do the lookup in the thread requesting
1420 // the compilation. Native lookups can load code, which is not
1421 // permitted during compilation.
1422 //
1423 // Note: A native method implies non-osr compilation which is
1424 // checked with an assertion at the entry of this method.
1425 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1426 address adr = NativeLookup::lookup(method, THREAD);
1427 if (HAS_PENDING_EXCEPTION) {
1428 // In case of an exception looking up the method, we just forget
1429 // about it. The interpreter will kick-in and throw the exception.
1430 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1431 CLEAR_PENDING_EXCEPTION;
1432 return nullptr;
1433 }
1434 assert(method->has_native_function(), "must have native code by now");
1435 }
1436
1437 // RedefineClasses() has replaced this method; just return
1438 if (method->is_old()) {
1439 return nullptr;
1440 }
1441
1442 // JVMTI -- post_compile_event requires jmethod_id() that may require
1443 // a lock the compiling thread can not acquire. Prefetch it here.
1444 if (JvmtiExport::should_post_compiled_method_load()) {
1445 method->jmethod_id();
1446 }
1447
1448 // do the compilation
1449 if (method->is_native()) {
1450 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1451 #if defined(X86) && !defined(ZERO)
1452 // The following native methods:
1453 //
1454 // java.lang.Float.intBitsToFloat
1455 // java.lang.Float.floatToRawIntBits
1456 // java.lang.Double.longBitsToDouble
1457 // java.lang.Double.doubleToRawLongBits
1458 //
1459 // are called through the interpreter even if interpreter native stubs
1460 // are not preferred (i.e., calling through adapter handlers is preferred).
1461 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1462 // if the version of the methods from the native libraries is called.
1463 // As the interpreter and the C2-intrinsified version of the methods preserves
1464 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1465 if ((UseSSE >= 1 &&
1466 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1467 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1468 (UseSSE >= 2 &&
1469 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1470 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1471 return nullptr;
1472 }
1473 #endif // X86 && !ZERO
1474
1475 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1476 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1477 //
1478 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1479 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1480 AdapterHandlerLibrary::create_native_wrapper(method);
1481 } else {
1482 return nullptr;
1483 }
1484 } else {
1485 // If the compiler is shut off due to code cache getting full
1486 // fail out now so blocking compiles dont hang the java thread
1487 if (!should_compile_new_jobs()) {
1488 return nullptr;
1489 }
1490 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1491 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1492 }
1493
1494 // return requested nmethod
1495 // We accept a higher level osr method
1496 if (osr_bci == InvocationEntryBci) {
1497 return method->code();
1498 }
1499 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1500 }
1501
1502
1503 // ------------------------------------------------------------------
1504 // CompileBroker::compilation_is_complete
1505 //
1506 // See if compilation of this method is already complete.
1507 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1508 int osr_bci,
1509 int comp_level) {
1510 bool is_osr = (osr_bci != standard_entry_bci);
1511 if (is_osr) {
1512 if (method->is_not_osr_compilable(comp_level)) {
1513 return true;
1514 } else {
1515 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1516 return (result != nullptr);
1517 }
1518 } else {
1519 if (method->is_not_compilable(comp_level)) {
1520 return true;
1521 } else {
1522 nmethod* result = method->code();
1523 if (result == nullptr) return false;
1524 return comp_level == result->comp_level();
1525 }
1526 }
1527 }
1528
1529
1530 /**
1531 * See if this compilation is already requested.
1532 *
1533 * Implementation note: there is only a single "is in queue" bit
1534 * for each method. This means that the check below is overly
1535 * conservative in the sense that an osr compilation in the queue
1536 * will block a normal compilation from entering the queue (and vice
1537 * versa). This can be remedied by a full queue search to disambiguate
1538 * cases. If it is deemed profitable, this may be done.
1539 */
1540 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1541 return method->queued_for_compilation();
1542 }
1543
1544 // ------------------------------------------------------------------
1545 // CompileBroker::compilation_is_prohibited
1546 //
1547 // See if this compilation is not allowed.
1548 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1549 bool is_native = method->is_native();
1550 // Some compilers may not support the compilation of natives.
1551 AbstractCompiler *comp = compiler(comp_level);
1552 if (is_native && (!CICompileNatives || comp == nullptr)) {
1553 method->set_not_compilable_quietly("native methods not supported", comp_level);
1554 return true;
1555 }
1556
1557 bool is_osr = (osr_bci != standard_entry_bci);
1558 // Some compilers may not support on stack replacement.
1559 if (is_osr && (!CICompileOSR || comp == nullptr)) {
1560 method->set_not_osr_compilable("OSR not supported", comp_level);
1561 return true;
1562 }
1563
1564 // The method may be explicitly excluded by the user.
1565 double scale;
1566 if (excluded || (CompilerOracle::has_option_value(method, CompileCommandEnum::CompileThresholdScaling, scale) && scale == 0)) {
1567 bool quietly = CompilerOracle::be_quiet();
1568 if (PrintCompilation && !quietly) {
1569 // This does not happen quietly...
1570 ResourceMark rm;
1571 tty->print("### Excluding %s:%s",
1572 method->is_native() ? "generation of native wrapper" : "compile",
1573 (method->is_static() ? " static" : ""));
1574 method->print_short_name(tty);
1575 tty->cr();
1576 }
1577 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1578 }
1579
1580 return false;
1581 }
1582
1583 /**
1584 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1585 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1586 * The function also allows to generate separate compilation IDs for OSR compilations.
1587 */
1588 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1589 #ifdef ASSERT
1590 bool is_osr = (osr_bci != standard_entry_bci);
1591 int id;
1592 if (method->is_native()) {
1593 assert(!is_osr, "can't be osr");
1594 // Adapters, native wrappers and method handle intrinsics
1595 // should be generated always.
1596 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1597 } else if (CICountOSR && is_osr) {
1598 id = Atomic::add(&_osr_compilation_id, 1);
1599 if (CIStartOSR <= id && id < CIStopOSR) {
1600 return id;
1601 }
1602 } else {
1603 id = Atomic::add(&_compilation_id, 1);
1604 if (CIStart <= id && id < CIStop) {
1605 return id;
1606 }
1607 }
1608
1609 // Method was not in the appropriate compilation range.
1610 method->set_not_compilable_quietly("Not in requested compile id range");
1611 return 0;
1612 #else
1613 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1614 // only _compilation_id is incremented.
1615 return Atomic::add(&_compilation_id, 1);
1616 #endif
1617 }
1618
1619 // ------------------------------------------------------------------
1620 // CompileBroker::assign_compile_id_unlocked
1621 //
1622 // Public wrapper for assign_compile_id that acquires the needed locks
1623 int CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1624 MutexLocker locker(thread, MethodCompileQueue_lock);
1625 return assign_compile_id(method, osr_bci);
1626 }
1627
1628 // ------------------------------------------------------------------
1629 // CompileBroker::create_compile_task
1630 //
1631 // Create a CompileTask object representing the current request for
1632 // compilation. Add this task to the queue.
1633 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1634 int compile_id,
1635 const methodHandle& method,
1636 int osr_bci,
1637 int comp_level,
1638 const methodHandle& hot_method,
1639 int hot_count,
1640 CompileTask::CompileReason compile_reason,
1641 bool blocking) {
1642 CompileTask* new_task = CompileTask::allocate();
1643 new_task->initialize(compile_id, method, osr_bci, comp_level,
1644 hot_method, hot_count, compile_reason,
1645 blocking);
1646 queue->add(new_task);
1647 return new_task;
1648 }
1649
1650 #if INCLUDE_JVMCI
1651 // The number of milliseconds to wait before checking if
1652 // JVMCI compilation has made progress.
1653 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1654
1655 // The number of JVMCI compilation progress checks that must fail
1656 // before unblocking a thread waiting for a blocking compilation.
1657 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1658
1659 /**
1660 * Waits for a JVMCI compiler to complete a given task. This thread
1661 * waits until either the task completes or it sees no JVMCI compilation
1662 * progress for N consecutive milliseconds where N is
1663 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1664 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1665 *
1666 * @return true if this thread needs to free/recycle the task
1667 */
1668 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1669 assert(UseJVMCICompiler, "sanity");
1670 MonitorLocker ml(thread, task->lock());
1671 int progress_wait_attempts = 0;
1672 jint thread_jvmci_compilation_ticks = 0;
1673 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1674 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1675 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1676 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1677
1678 bool progress;
1679 if (jvmci_compile_state != nullptr) {
1680 jint ticks = jvmci_compile_state->compilation_ticks();
1681 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1682 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1683 thread_jvmci_compilation_ticks = ticks;
1684 } else {
1685 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1686 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1687 // compilation ticks to determine whether JVMCI compilation
1688 // is still making progress through the JVMCI compiler queue.
1689 jint ticks = jvmci->global_compilation_ticks();
1690 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1691 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1692 global_jvmci_compilation_ticks = ticks;
1693 }
1694
1695 if (!progress) {
1696 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1697 if (PrintCompilation) {
1698 task->print(tty, "wait for blocking compilation timed out");
1699 }
1700 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1701 break;
1702 }
1703 } else {
1704 progress_wait_attempts = 0;
1705 }
1706 }
1707 task->clear_waiter();
1708 return task->is_complete();
1709 }
1710 #endif
1711
1712 /**
1713 * Wait for the compilation task to complete.
1714 */
1715 void CompileBroker::wait_for_completion(CompileTask* task) {
1716 if (CIPrintCompileQueue) {
1717 ttyLocker ttyl;
1718 tty->print_cr("BLOCKING FOR COMPILE");
1719 }
1720
1721 assert(task->is_blocking(), "can only wait on blocking task");
1722
1723 JavaThread* thread = JavaThread::current();
1724
1725 methodHandle method(thread, task->method());
1726 bool free_task;
1727 #if INCLUDE_JVMCI
1728 AbstractCompiler* comp = compiler(task->comp_level());
1729 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) {
1730 // It may return before compilation is completed.
1731 // Note that libjvmci should not pre-emptively unblock
1732 // a thread waiting for a compilation as it does not call
1733 // Java code and so is not deadlock prone like jarjvmci.
1734 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1735 } else
1736 #endif
1737 {
1738 MonitorLocker ml(thread, task->lock());
1739 free_task = true;
1740 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1741 ml.wait();
1742 }
1743 }
1744
1745 if (free_task) {
1746 if (is_compilation_disabled_forever()) {
1747 CompileTask::free(task);
1748 return;
1749 }
1750
1751 // It is harmless to check this status without the lock, because
1752 // completion is a stable property (until the task object is recycled).
1753 assert(task->is_complete(), "Compilation should have completed");
1754
1755 // By convention, the waiter is responsible for recycling a
1756 // blocking CompileTask. Since there is only one waiter ever
1757 // waiting on a CompileTask, we know that no one else will
1758 // be using this CompileTask; we can free it.
1759 CompileTask::free(task);
1760 }
1761 }
1762
1763 /**
1764 * Initialize compiler thread(s) + compiler object(s). The postcondition
1765 * of this function is that the compiler runtimes are initialized and that
1766 * compiler threads can start compiling.
1767 */
1768 bool CompileBroker::init_compiler_runtime() {
1769 CompilerThread* thread = CompilerThread::current();
1770 AbstractCompiler* comp = thread->compiler();
1771 // Final sanity check - the compiler object must exist
1772 guarantee(comp != nullptr, "Compiler object must exist");
1773
1774 {
1775 // Must switch to native to allocate ci_env
1776 ThreadToNativeFromVM ttn(thread);
1777 ciEnv ci_env((CompileTask*)nullptr);
1778 // Cache Jvmti state
1779 ci_env.cache_jvmti_state();
1780 // Cache DTrace flags
1781 ci_env.cache_dtrace_flags();
1782
1783 // Switch back to VM state to do compiler initialization
1784 ThreadInVMfromNative tv(thread);
1785
1786 // Perform per-thread and global initializations
1787 comp->initialize();
1788 }
1789
1790 if (comp->is_failed()) {
1791 disable_compilation_forever();
1792 // If compiler initialization failed, no compiler thread that is specific to a
1793 // particular compiler runtime will ever start to compile methods.
1794 shutdown_compiler_runtime(comp, thread);
1795 return false;
1796 }
1797
1798 // C1 specific check
1799 if (comp->is_c1() && (thread->get_buffer_blob() == nullptr)) {
1800 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1801 return false;
1802 }
1803
1804 return true;
1805 }
1806
1807 void CompileBroker::free_buffer_blob_if_allocated(CompilerThread* thread) {
1808 BufferBlob* blob = thread->get_buffer_blob();
1809 if (blob != nullptr) {
1810 blob->purge();
1811 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1812 CodeCache::free(blob);
1813 }
1814 }
1815
1816 /**
1817 * If C1 and/or C2 initialization failed, we shut down all compilation.
1818 * We do this to keep things simple. This can be changed if it ever turns
1819 * out to be a problem.
1820 */
1821 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1822 free_buffer_blob_if_allocated(thread);
1823
1824 if (comp->should_perform_shutdown()) {
1825 // There are two reasons for shutting down the compiler
1826 // 1) compiler runtime initialization failed
1827 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1828 warning("%s initialization failed. Shutting down all compilers", comp->name());
1829
1830 // Only one thread per compiler runtime object enters here
1831 // Set state to shut down
1832 comp->set_shut_down();
1833
1834 // Delete all queued compilation tasks to make compiler threads exit faster.
1835 if (_c1_compile_queue != nullptr) {
1836 _c1_compile_queue->free_all();
1837 }
1838
1839 if (_c2_compile_queue != nullptr) {
1840 _c2_compile_queue->free_all();
1841 }
1842
1843 // Set flags so that we continue execution with using interpreter only.
1844 UseCompiler = false;
1845 UseInterpreter = true;
1846
1847 // We could delete compiler runtimes also. However, there are references to
1848 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1849 // fail. This can be done later if necessary.
1850 }
1851 }
1852
1853 /**
1854 * Helper function to create new or reuse old CompileLog.
1855 */
1856 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1857 if (!LogCompilation) return nullptr;
1858
1859 AbstractCompiler *compiler = ct->compiler();
1860 bool c1 = compiler->is_c1();
1861 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1862 assert(compiler_objects != nullptr, "must be initialized at this point");
1863 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1864 assert(logs != nullptr, "must be initialized at this point");
1865 int count = c1 ? _c1_count : _c2_count;
1866
1867 // Find Compiler number by its threadObj.
1868 oop compiler_obj = ct->threadObj();
1869 int compiler_number = 0;
1870 bool found = false;
1871 for (; compiler_number < count; compiler_number++) {
1872 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1873 found = true;
1874 break;
1875 }
1876 }
1877 assert(found, "Compiler must exist at this point");
1878
1879 // Determine pointer for this thread's log.
1880 CompileLog** log_ptr = &logs[compiler_number];
1881
1882 // Return old one if it exists.
1883 CompileLog* log = *log_ptr;
1884 if (log != nullptr) {
1885 ct->init_log(log);
1886 return log;
1887 }
1888
1889 // Create a new one and remember it.
1890 init_compiler_thread_log();
1891 log = ct->log();
1892 *log_ptr = log;
1893 return log;
1894 }
1895
1896 // ------------------------------------------------------------------
1897 // CompileBroker::compiler_thread_loop
1898 //
1899 // The main loop run by a CompilerThread.
1900 void CompileBroker::compiler_thread_loop() {
1901 CompilerThread* thread = CompilerThread::current();
1902 CompileQueue* queue = thread->queue();
1903 // For the thread that initializes the ciObjectFactory
1904 // this resource mark holds all the shared objects
1905 ResourceMark rm;
1906
1907 // First thread to get here will initialize the compiler interface
1908
1909 {
1910 ASSERT_IN_VM;
1911 MutexLocker only_one (thread, CompileThread_lock);
1912 if (!ciObjectFactory::is_initialized()) {
1913 ciObjectFactory::initialize();
1914 }
1915 }
1916
1917 // Open a log.
1918 CompileLog* log = get_log(thread);
1919 if (log != nullptr) {
1920 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1921 thread->name(),
1922 os::current_thread_id(),
1923 os::current_process_id());
1924 log->stamp();
1925 log->end_elem();
1926 }
1927
1928 // If compiler thread/runtime initialization fails, exit the compiler thread
1929 if (!init_compiler_runtime()) {
1930 return;
1931 }
1932
1933 thread->start_idle_timer();
1934
1935 // Poll for new compilation tasks as long as the JVM runs. Compilation
1936 // should only be disabled if something went wrong while initializing the
1937 // compiler runtimes. This, in turn, should not happen. The only known case
1938 // when compiler runtime initialization fails is if there is not enough free
1939 // space in the code cache to generate the necessary stubs, etc.
1940 while (!is_compilation_disabled_forever()) {
1941 // We need this HandleMark to avoid leaking VM handles.
1942 HandleMark hm(thread);
1943
1944 CompileTask* task = queue->get(thread);
1945 if (task == nullptr) {
1946 if (UseDynamicNumberOfCompilerThreads) {
1947 // Access compiler_count under lock to enforce consistency.
1948 MutexLocker only_one(CompileThread_lock);
1949 if (can_remove(thread, true)) {
1950 if (trace_compiler_threads()) {
1951 ResourceMark rm;
1952 stringStream msg;
1953 msg.print("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1954 thread->name(), thread->idle_time_millis());
1955 print_compiler_threads(msg);
1956 }
1957
1958 // Notify compiler that the compiler thread is about to stop
1959 thread->compiler()->stopping_compiler_thread(thread);
1960
1961 free_buffer_blob_if_allocated(thread);
1962 return; // Stop this thread.
1963 }
1964 }
1965 } else {
1966 // Assign the task to the current thread. Mark this compilation
1967 // thread as active for the profiler.
1968 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1969 // occurs after fetching the compile task off the queue.
1970 CompileTaskWrapper ctw(task);
1971 methodHandle method(thread, task->method());
1972
1973 // Never compile a method if breakpoints are present in it
1974 if (method()->number_of_breakpoints() == 0) {
1975 // Compile the method.
1976 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1977 invoke_compiler_on_method(task);
1978 thread->start_idle_timer();
1979 } else {
1980 // After compilation is disabled, remove remaining methods from queue
1981 method->clear_queued_for_compilation();
1982 task->set_failure_reason("compilation is disabled");
1983 }
1984 } else {
1985 task->set_failure_reason("breakpoints are present");
1986 }
1987
1988 if (UseDynamicNumberOfCompilerThreads) {
1989 possibly_add_compiler_threads(thread);
1990 assert(!thread->has_pending_exception(), "should have been handled");
1991 }
1992 }
1993 }
1994
1995 // Shut down compiler runtime
1996 shutdown_compiler_runtime(thread->compiler(), thread);
1997 }
1998
1999 // ------------------------------------------------------------------
2000 // CompileBroker::init_compiler_thread_log
2001 //
2002 // Set up state required by +LogCompilation.
2003 void CompileBroker::init_compiler_thread_log() {
2004 CompilerThread* thread = CompilerThread::current();
2005 char file_name[4*K];
2006 FILE* fp = nullptr;
2007 intx thread_id = os::current_thread_id();
2008 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
2009 const char* dir = (try_temp_dir ? os::get_temp_directory() : nullptr);
2010 if (dir == nullptr) {
2011 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
2012 thread_id, os::current_process_id());
2013 } else {
2014 jio_snprintf(file_name, sizeof(file_name),
2015 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
2016 os::file_separator(), thread_id, os::current_process_id());
2017 }
2018
2019 fp = os::fopen(file_name, "wt");
2020 if (fp != nullptr) {
2021 if (LogCompilation && Verbose) {
2022 tty->print_cr("Opening compilation log %s", file_name);
2023 }
2024 CompileLog* log = new(mtCompiler) CompileLog(file_name, fp, thread_id);
2025 if (log == nullptr) {
2026 fclose(fp);
2027 return;
2028 }
2029 thread->init_log(log);
2030
2031 if (xtty != nullptr) {
2032 ttyLocker ttyl;
2033 // Record any per thread log files
2034 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2035 }
2036 return;
2037 }
2038 }
2039 warning("Cannot open log file: %s", file_name);
2040 }
2041
2042 void CompileBroker::log_metaspace_failure() {
2043 const char* message = "some methods may not be compiled because metaspace "
2044 "is out of memory";
2045 if (CompilationLog::log() != nullptr) {
2046 CompilationLog::log()->log_metaspace_failure(message);
2047 }
2048 if (PrintCompilation) {
2049 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2050 }
2051 }
2052
2053
2054 // ------------------------------------------------------------------
2055 // CompileBroker::set_should_block
2056 //
2057 // Set _should_block.
2058 // Call this from the VM, with Threads_lock held and a safepoint requested.
2059 void CompileBroker::set_should_block() {
2060 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2061 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2062 #ifndef PRODUCT
2063 if (PrintCompilation && (Verbose || WizardMode))
2064 tty->print_cr("notifying compiler thread pool to block");
2065 #endif
2066 _should_block = true;
2067 }
2068
2069 // ------------------------------------------------------------------
2070 // CompileBroker::maybe_block
2071 //
2072 // Call this from the compiler at convenient points, to poll for _should_block.
2073 void CompileBroker::maybe_block() {
2074 if (_should_block) {
2075 #ifndef PRODUCT
2076 if (PrintCompilation && (Verbose || WizardMode))
2077 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2078 #endif
2079 ThreadInVMfromNative tivfn(JavaThread::current());
2080 }
2081 }
2082
2083 // wrapper for CodeCache::print_summary()
2084 static void codecache_print(bool detailed)
2085 {
2086 stringStream s;
2087 // Dump code cache into a buffer before locking the tty,
2088 {
2089 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2090 CodeCache::print_summary(&s, detailed);
2091 }
2092 ttyLocker ttyl;
2093 tty->print("%s", s.freeze());
2094 }
2095
2096 // wrapper for CodeCache::print_summary() using outputStream
2097 static void codecache_print(outputStream* out, bool detailed) {
2098 stringStream s;
2099
2100 // Dump code cache into a buffer
2101 {
2102 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2103 CodeCache::print_summary(&s, detailed);
2104 }
2105
2106 char* remaining_log = s.as_string();
2107 while (*remaining_log != '\0') {
2108 char* eol = strchr(remaining_log, '\n');
2109 if (eol == nullptr) {
2110 out->print_cr("%s", remaining_log);
2111 remaining_log = remaining_log + strlen(remaining_log);
2112 } else {
2113 *eol = '\0';
2114 out->print_cr("%s", remaining_log);
2115 remaining_log = eol + 1;
2116 }
2117 }
2118 }
2119
2120 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env,
2121 int compilable, const char* failure_reason) {
2122 if (!AbortVMOnCompilationFailure) {
2123 return;
2124 }
2125 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2126 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2127 }
2128 if (compilable == ciEnv::MethodCompilable_never) {
2129 fatal("Never compilable: %s", failure_reason);
2130 }
2131 }
2132
2133 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2134 assert(task != nullptr, "invariant");
2135 CompilerEvent::CompilationEvent::post(event,
2136 task->compile_id(),
2137 task->compiler()->type(),
2138 task->method(),
2139 task->comp_level(),
2140 task->is_success(),
2141 task->osr_bci() != CompileBroker::standard_entry_bci,
2142 task->nm_total_size(),
2143 task->num_inlined_bytecodes(),
2144 task->arena_bytes());
2145 }
2146
2147 int DirectivesStack::_depth = 0;
2148 CompilerDirectives* DirectivesStack::_top = nullptr;
2149 CompilerDirectives* DirectivesStack::_bottom = nullptr;
2150
2151 // Acquires Compilation_lock and waits for it to be notified
2152 // as long as WhiteBox::compilation_locked is true.
2153 static void whitebox_lock_compilation() {
2154 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2155 while (WhiteBox::compilation_locked) {
2156 locker.wait();
2157 }
2158 }
2159
2160 // ------------------------------------------------------------------
2161 // CompileBroker::invoke_compiler_on_method
2162 //
2163 // Compile a method.
2164 //
2165 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2166 task->print_ul();
2167 elapsedTimer time;
2168
2169 DirectiveSet* directive = task->directive();
2170 if (directive->PrintCompilationOption) {
2171 ResourceMark rm;
2172 task->print_tty();
2173 }
2174
2175 CompilerThread* thread = CompilerThread::current();
2176 ResourceMark rm(thread);
2177
2178 if (CompilationLog::log() != nullptr) {
2179 CompilationLog::log()->log_compile(thread, task);
2180 }
2181
2182 // Common flags.
2183 int compile_id = task->compile_id();
2184 int osr_bci = task->osr_bci();
2185 bool is_osr = (osr_bci != standard_entry_bci);
2186 bool should_log = (thread->log() != nullptr);
2187 bool should_break = false;
2188 const int task_level = task->comp_level();
2189 AbstractCompiler* comp = task->compiler();
2190 {
2191 // create the handle inside it's own block so it can't
2192 // accidentally be referenced once the thread transitions to
2193 // native. The NoHandleMark before the transition should catch
2194 // any cases where this occurs in the future.
2195 methodHandle method(thread, task->method());
2196
2197 assert(!method->is_native(), "no longer compile natives");
2198
2199 // Update compile information when using perfdata.
2200 if (UsePerfData) {
2201 update_compile_perf_data(thread, method, is_osr);
2202 }
2203
2204 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2205 }
2206
2207 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2208 if (should_log && !directive->LogOption) {
2209 should_log = false;
2210 }
2211
2212 // Allocate a new set of JNI handles.
2213 JNIHandleMark jhm(thread);
2214 Method* target_handle = task->method();
2215 int compilable = ciEnv::MethodCompilable;
2216 const char* failure_reason = nullptr;
2217 bool failure_reason_on_C_heap = false;
2218 const char* retry_message = nullptr;
2219
2220 #if INCLUDE_JVMCI
2221 if (UseJVMCICompiler && comp != nullptr && comp->is_jvmci()) {
2222 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2223
2224 TraceTime t1("compilation", &time);
2225 EventCompilation event;
2226 JVMCICompileState compile_state(task, jvmci);
2227 JVMCIRuntime *runtime = nullptr;
2228
2229 if (JVMCI::in_shutdown()) {
2230 failure_reason = "in JVMCI shutdown";
2231 retry_message = "not retryable";
2232 compilable = ciEnv::MethodCompilable_never;
2233 } else if (compile_state.target_method_is_old()) {
2234 // Skip redefined methods
2235 failure_reason = "redefined method";
2236 retry_message = "not retryable";
2237 compilable = ciEnv::MethodCompilable_never;
2238 } else {
2239 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2240 if (env.init_error() != JNI_OK) {
2241 const char* msg = env.init_error_msg();
2242 failure_reason = os::strdup(err_msg("Error attaching to libjvmci (err: %d, %s)",
2243 env.init_error(), msg == nullptr ? "unknown" : msg), mtJVMCI);
2244 bool reason_on_C_heap = true;
2245 // In case of JNI_ENOMEM, there's a good chance a subsequent attempt to create libjvmci or attach to it
2246 // might succeed. Other errors most likely indicate a non-recoverable error in the JVMCI runtime.
2247 bool retryable = env.init_error() == JNI_ENOMEM;
2248 compile_state.set_failure(retryable, failure_reason, reason_on_C_heap);
2249 }
2250 if (failure_reason == nullptr) {
2251 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2252 // Must switch to native to block
2253 ThreadToNativeFromVM ttn(thread);
2254 whitebox_lock_compilation();
2255 }
2256 methodHandle method(thread, target_handle);
2257 runtime = env.runtime();
2258 runtime->compile_method(&env, jvmci, method, osr_bci);
2259
2260 failure_reason = compile_state.failure_reason();
2261 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2262 if (!compile_state.retryable()) {
2263 retry_message = "not retryable";
2264 compilable = ciEnv::MethodCompilable_not_at_tier;
2265 }
2266 if (!task->is_success()) {
2267 assert(failure_reason != nullptr, "must specify failure_reason");
2268 }
2269 }
2270 }
2271 if (!task->is_success() && !JVMCI::in_shutdown()) {
2272 handle_compile_error(thread, task, nullptr, compilable, failure_reason);
2273 }
2274 if (event.should_commit()) {
2275 post_compilation_event(event, task);
2276 }
2277
2278 if (runtime != nullptr) {
2279 runtime->post_compile(thread);
2280 }
2281 } else
2282 #endif // INCLUDE_JVMCI
2283 {
2284 NoHandleMark nhm;
2285 ThreadToNativeFromVM ttn(thread);
2286
2287 ciEnv ci_env(task);
2288 if (should_break) {
2289 ci_env.set_break_at_compile(true);
2290 }
2291 if (should_log) {
2292 ci_env.set_log(thread->log());
2293 }
2294 assert(thread->env() == &ci_env, "set by ci_env");
2295 // The thread-env() field is cleared in ~CompileTaskWrapper.
2296
2297 // Cache Jvmti state
2298 bool method_is_old = ci_env.cache_jvmti_state();
2299
2300 // Skip redefined methods
2301 if (method_is_old) {
2302 ci_env.record_method_not_compilable("redefined method", true);
2303 }
2304
2305 // Cache DTrace flags
2306 ci_env.cache_dtrace_flags();
2307
2308 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2309
2310 TraceTime t1("compilation", &time);
2311 EventCompilation event;
2312
2313 if (comp == nullptr) {
2314 ci_env.record_method_not_compilable("no compiler");
2315 } else if (!ci_env.failing()) {
2316 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2317 whitebox_lock_compilation();
2318 }
2319 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2320
2321 /* Repeat compilation without installing code for profiling purposes */
2322 int repeat_compilation_count = directive->RepeatCompilationOption;
2323 while (repeat_compilation_count > 0) {
2324 ResourceMark rm(thread);
2325 task->print_ul("NO CODE INSTALLED");
2326 comp->compile_method(&ci_env, target, osr_bci, false, directive);
2327 repeat_compilation_count--;
2328 }
2329 }
2330
2331 DirectivesStack::release(directive);
2332
2333 if (!ci_env.failing() && !task->is_success()) {
2334 assert(ci_env.failure_reason() != nullptr, "expect failure reason");
2335 assert(false, "compiler should always document failure: %s", ci_env.failure_reason());
2336 // The compiler elected, without comment, not to register a result.
2337 // Do not attempt further compilations of this method.
2338 ci_env.record_method_not_compilable("compile failed");
2339 }
2340
2341 // Copy this bit to the enclosing block:
2342 compilable = ci_env.compilable();
2343
2344 if (ci_env.failing()) {
2345 // Duplicate the failure reason string, so that it outlives ciEnv
2346 failure_reason = os::strdup(ci_env.failure_reason(), mtCompiler);
2347 failure_reason_on_C_heap = true;
2348 retry_message = ci_env.retry_message();
2349 ci_env.report_failure(failure_reason);
2350 }
2351
2352 if (ci_env.failing()) {
2353 handle_compile_error(thread, task, &ci_env, compilable, failure_reason);
2354 }
2355 if (event.should_commit()) {
2356 post_compilation_event(event, task);
2357 }
2358 }
2359
2360 if (failure_reason != nullptr) {
2361 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2362 if (CompilationLog::log() != nullptr) {
2363 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message);
2364 }
2365 if (PrintCompilation) {
2366 FormatBufferResource msg = retry_message != nullptr ?
2367 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2368 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2369 task->print(tty, msg);
2370 }
2371 }
2372
2373 methodHandle method(thread, task->method());
2374
2375 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2376
2377 collect_statistics(thread, time, task);
2378
2379 if (PrintCompilation && PrintCompilation2) {
2380 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2381 tty->print("%4d ", compile_id); // print compilation number
2382 tty->print("%s ", (is_osr ? "%" : " "));
2383 if (task->is_success()) {
2384 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size());
2385 }
2386 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2387 }
2388
2389 Log(compilation, codecache) log;
2390 if (log.is_debug()) {
2391 LogStream ls(log.debug());
2392 codecache_print(&ls, /* detailed= */ false);
2393 }
2394 if (PrintCodeCacheOnCompilation) {
2395 codecache_print(/* detailed= */ false);
2396 }
2397 // Disable compilation, if required.
2398 switch (compilable) {
2399 case ciEnv::MethodCompilable_never:
2400 if (is_osr)
2401 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2402 else
2403 method->set_not_compilable_quietly("MethodCompilable_never");
2404 break;
2405 case ciEnv::MethodCompilable_not_at_tier:
2406 if (is_osr)
2407 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2408 else
2409 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2410 break;
2411 }
2412
2413 // Note that the queued_for_compilation bits are cleared without
2414 // protection of a mutex. [They were set by the requester thread,
2415 // when adding the task to the compile queue -- at which time the
2416 // compile queue lock was held. Subsequently, we acquired the compile
2417 // queue lock to get this task off the compile queue; thus (to belabour
2418 // the point somewhat) our clearing of the bits must be occurring
2419 // only after the setting of the bits. See also 14012000 above.
2420 method->clear_queued_for_compilation();
2421 }
2422
2423 /**
2424 * The CodeCache is full. Print warning and disable compilation.
2425 * Schedule code cache cleaning so compilation can continue later.
2426 * This function needs to be called only from CodeCache::allocate(),
2427 * since we currently handle a full code cache uniformly.
2428 */
2429 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) {
2430 UseInterpreter = true;
2431 if (UseCompiler || AlwaysCompileLoopMethods ) {
2432 if (xtty != nullptr) {
2433 stringStream s;
2434 // Dump code cache state into a buffer before locking the tty,
2435 // because log_state() will use locks causing lock conflicts.
2436 CodeCache::log_state(&s);
2437 // Lock to prevent tearing
2438 ttyLocker ttyl;
2439 xtty->begin_elem("code_cache_full");
2440 xtty->print("%s", s.freeze());
2441 xtty->stamp();
2442 xtty->end_elem();
2443 }
2444
2445 #ifndef PRODUCT
2446 if (ExitOnFullCodeCache) {
2447 codecache_print(/* detailed= */ true);
2448 before_exit(JavaThread::current());
2449 exit_globals(); // will delete tty
2450 vm_direct_exit(1);
2451 }
2452 #endif
2453 if (UseCodeCacheFlushing) {
2454 // Since code cache is full, immediately stop new compiles
2455 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2456 log_info(codecache)("Code cache is full - disabling compilation");
2457 }
2458 } else {
2459 disable_compilation_forever();
2460 }
2461
2462 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2463 }
2464 }
2465
2466 // ------------------------------------------------------------------
2467 // CompileBroker::update_compile_perf_data
2468 //
2469 // Record this compilation for debugging purposes.
2470 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2471 ResourceMark rm;
2472 char* method_name = method->name()->as_C_string();
2473 char current_method[CompilerCounters::cmname_buffer_length];
2474 size_t maxLen = CompilerCounters::cmname_buffer_length;
2475
2476 const char* class_name = method->method_holder()->name()->as_C_string();
2477
2478 size_t s1len = strlen(class_name);
2479 size_t s2len = strlen(method_name);
2480
2481 // check if we need to truncate the string
2482 if (s1len + s2len + 2 > maxLen) {
2483
2484 // the strategy is to lop off the leading characters of the
2485 // class name and the trailing characters of the method name.
2486
2487 if (s2len + 2 > maxLen) {
2488 // lop of the entire class name string, let snprintf handle
2489 // truncation of the method name.
2490 class_name += s1len; // null string
2491 }
2492 else {
2493 // lop off the extra characters from the front of the class name
2494 class_name += ((s1len + s2len + 2) - maxLen);
2495 }
2496 }
2497
2498 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2499
2500 int last_compile_type = normal_compile;
2501 if (CICountOSR && is_osr) {
2502 last_compile_type = osr_compile;
2503 } else if (CICountNative && method->is_native()) {
2504 last_compile_type = native_compile;
2505 }
2506
2507 CompilerCounters* counters = thread->counters();
2508 counters->set_current_method(current_method);
2509 counters->set_compile_type((jlong) last_compile_type);
2510 }
2511
2512 // ------------------------------------------------------------------
2513 // CompileBroker::collect_statistics
2514 //
2515 // Collect statistics about the compilation.
2516
2517 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2518 bool success = task->is_success();
2519 methodHandle method (thread, task->method());
2520 int compile_id = task->compile_id();
2521 bool is_osr = (task->osr_bci() != standard_entry_bci);
2522 const int comp_level = task->comp_level();
2523 CompilerCounters* counters = thread->counters();
2524
2525 MutexLocker locker(CompileStatistics_lock);
2526
2527 // _perf variables are production performance counters which are
2528 // updated regardless of the setting of the CITime and CITimeEach flags
2529 //
2530
2531 // account all time, including bailouts and failures in this counter;
2532 // C1 and C2 counters are counting both successful and unsuccessful compiles
2533 _t_total_compilation.add(time);
2534
2535 if (!success) {
2536 _total_bailout_count++;
2537 if (UsePerfData) {
2538 _perf_last_failed_method->set_value(counters->current_method());
2539 _perf_last_failed_type->set_value(counters->compile_type());
2540 _perf_total_bailout_count->inc();
2541 }
2542 _t_bailedout_compilation.add(time);
2543 } else if (!task->is_success()) {
2544 if (UsePerfData) {
2545 _perf_last_invalidated_method->set_value(counters->current_method());
2546 _perf_last_invalidated_type->set_value(counters->compile_type());
2547 _perf_total_invalidated_count->inc();
2548 }
2549 _total_invalidated_count++;
2550 _t_invalidated_compilation.add(time);
2551 } else {
2552 // Compilation succeeded
2553
2554 // update compilation ticks - used by the implementation of
2555 // java.lang.management.CompilationMXBean
2556 _perf_total_compilation->inc(time.ticks());
2557 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2558
2559 if (CITime) {
2560 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2561 if (is_osr) {
2562 _t_osr_compilation.add(time);
2563 _sum_osr_bytes_compiled += bytes_compiled;
2564 } else {
2565 _t_standard_compilation.add(time);
2566 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2567 }
2568
2569 // Collect statistic per compilation level
2570 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2571 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2572 if (is_osr) {
2573 stats->_osr.update(time, bytes_compiled);
2574 } else {
2575 stats->_standard.update(time, bytes_compiled);
2576 }
2577 stats->_nmethods_size += task->nm_total_size();
2578 stats->_nmethods_code_size += task->nm_insts_size();
2579 } else {
2580 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2581 }
2582
2583 // Collect statistic per compiler
2584 AbstractCompiler* comp = compiler(comp_level);
2585 if (comp) {
2586 CompilerStatistics* stats = comp->stats();
2587 if (is_osr) {
2588 stats->_osr.update(time, bytes_compiled);
2589 } else {
2590 stats->_standard.update(time, bytes_compiled);
2591 }
2592 stats->_nmethods_size += task->nm_total_size();
2593 stats->_nmethods_code_size += task->nm_insts_size();
2594 } else { // if (!comp)
2595 assert(false, "Compiler object must exist");
2596 }
2597 }
2598
2599 if (UsePerfData) {
2600 // save the name of the last method compiled
2601 _perf_last_method->set_value(counters->current_method());
2602 _perf_last_compile_type->set_value(counters->compile_type());
2603 _perf_last_compile_size->set_value(method->code_size() +
2604 task->num_inlined_bytecodes());
2605 if (is_osr) {
2606 _perf_osr_compilation->inc(time.ticks());
2607 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2608 } else {
2609 _perf_standard_compilation->inc(time.ticks());
2610 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2611 }
2612 }
2613
2614 if (CITimeEach) {
2615 double compile_time = time.seconds();
2616 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2617 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2618 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2619 }
2620
2621 // Collect counts of successful compilations
2622 _sum_nmethod_size += task->nm_total_size();
2623 _sum_nmethod_code_size += task->nm_insts_size();
2624 _total_compile_count++;
2625
2626 if (UsePerfData) {
2627 _perf_sum_nmethod_size->inc( task->nm_total_size());
2628 _perf_sum_nmethod_code_size->inc(task->nm_insts_size());
2629 _perf_total_compile_count->inc();
2630 }
2631
2632 if (is_osr) {
2633 if (UsePerfData) _perf_total_osr_compile_count->inc();
2634 _total_osr_compile_count++;
2635 } else {
2636 if (UsePerfData) _perf_total_standard_compile_count->inc();
2637 _total_standard_compile_count++;
2638 }
2639 }
2640 // set the current method for the thread to null
2641 if (UsePerfData) counters->set_current_method("");
2642 }
2643
2644 const char* CompileBroker::compiler_name(int comp_level) {
2645 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2646 if (comp == nullptr) {
2647 return "no compiler";
2648 } else {
2649 return (comp->name());
2650 }
2651 }
2652
2653 jlong CompileBroker::total_compilation_ticks() {
2654 return _perf_total_compilation != nullptr ? _perf_total_compilation->get_value() : 0;
2655 }
2656
2657 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2658 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}",
2659 name, stats->bytes_per_second(),
2660 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2661 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2662 stats->_nmethods_size, stats->_nmethods_code_size);
2663 }
2664
2665 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2666 if (per_compiler) {
2667 if (aggregate) {
2668 tty->cr();
2669 tty->print_cr("Individual compiler times (for compiled methods only)");
2670 tty->print_cr("------------------------------------------------");
2671 tty->cr();
2672 }
2673 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2674 AbstractCompiler* comp = _compilers[i];
2675 if (comp != nullptr) {
2676 print_times(comp->name(), comp->stats());
2677 }
2678 }
2679 if (aggregate) {
2680 tty->cr();
2681 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2682 tty->print_cr("------------------------------------------------");
2683 tty->cr();
2684 }
2685 char tier_name[256];
2686 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2687 CompilerStatistics* stats = &_stats_per_level[tier-1];
2688 os::snprintf_checked(tier_name, sizeof(tier_name), "Tier%d", tier);
2689 print_times(tier_name, stats);
2690 }
2691 }
2692
2693 if (!aggregate) {
2694 return;
2695 }
2696
2697 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2698 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2699 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2700
2701 uint standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2702 uint osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2703
2704 uint standard_compile_count = CompileBroker::_total_standard_compile_count;
2705 uint osr_compile_count = CompileBroker::_total_osr_compile_count;
2706 uint total_compile_count = CompileBroker::_total_compile_count;
2707 uint total_bailout_count = CompileBroker::_total_bailout_count;
2708 uint total_invalidated_count = CompileBroker::_total_invalidated_count;
2709
2710 uint nmethods_code_size = CompileBroker::_sum_nmethod_code_size;
2711 uint nmethods_size = CompileBroker::_sum_nmethod_size;
2712
2713 tty->cr();
2714 tty->print_cr("Accumulated compiler times");
2715 tty->print_cr("----------------------------------------------------------");
2716 //0000000000111111111122222222223333333333444444444455555555556666666666
2717 //0123456789012345678901234567890123456789012345678901234567890123456789
2718 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2719 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2720 standard_compilation.seconds(),
2721 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2722 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2723 CompileBroker::_t_bailedout_compilation.seconds(),
2724 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2725 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2726 osr_compilation.seconds(),
2727 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2728 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2729 CompileBroker::_t_invalidated_compilation.seconds(),
2730 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2731
2732 AbstractCompiler *comp = compiler(CompLevel_simple);
2733 if (comp != nullptr) {
2734 tty->cr();
2735 comp->print_timers();
2736 }
2737 comp = compiler(CompLevel_full_optimization);
2738 if (comp != nullptr) {
2739 tty->cr();
2740 comp->print_timers();
2741 }
2742 #if INCLUDE_JVMCI
2743 if (EnableJVMCI) {
2744 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null());
2745 if (jvmci_comp != nullptr && jvmci_comp != comp) {
2746 tty->cr();
2747 jvmci_comp->print_timers();
2748 }
2749 }
2750 #endif
2751
2752 tty->cr();
2753 tty->print_cr(" Total compiled methods : %8u methods", total_compile_count);
2754 tty->print_cr(" Standard compilation : %8u methods", standard_compile_count);
2755 tty->print_cr(" On stack replacement : %8u methods", osr_compile_count);
2756 uint tcb = osr_bytes_compiled + standard_bytes_compiled;
2757 tty->print_cr(" Total compiled bytecodes : %8u bytes", tcb);
2758 tty->print_cr(" Standard compilation : %8u bytes", standard_bytes_compiled);
2759 tty->print_cr(" On stack replacement : %8u bytes", osr_bytes_compiled);
2760 double tcs = total_compilation.seconds();
2761 uint bps = tcs == 0.0 ? 0 : (uint)(tcb / tcs);
2762 tty->print_cr(" Average compilation speed : %8u bytes/s", bps);
2763 tty->cr();
2764 tty->print_cr(" nmethod code size : %8u bytes", nmethods_code_size);
2765 tty->print_cr(" nmethod total size : %8u bytes", nmethods_size);
2766 }
2767
2768 // Print general/accumulated JIT information.
2769 void CompileBroker::print_info(outputStream *out) {
2770 if (out == nullptr) out = tty;
2771 out->cr();
2772 out->print_cr("======================");
2773 out->print_cr(" General JIT info ");
2774 out->print_cr("======================");
2775 out->cr();
2776 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2777 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2778 out->cr();
2779 out->print_cr("CodeCache overview");
2780 out->print_cr("--------------------------------------------------------");
2781 out->cr();
2782 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2783 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2784 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2785 out->cr();
2786 }
2787
2788 // Note: tty_lock must not be held upon entry to this function.
2789 // Print functions called from herein do "micro-locking" on tty_lock.
2790 // That's a tradeoff which keeps together important blocks of output.
2791 // At the same time, continuous tty_lock hold time is kept in check,
2792 // preventing concurrently printing threads from stalling a long time.
2793 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2794 TimeStamp ts_total;
2795 TimeStamp ts_global;
2796 TimeStamp ts;
2797
2798 bool allFun = !strcmp(function, "all");
2799 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2800 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2801 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2802 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2803 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2804 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2805 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2806 bool discard = !strcmp(function, "discard") || allFun;
2807
2808 if (out == nullptr) {
2809 out = tty;
2810 }
2811
2812 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2813 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2814 out->cr();
2815 return;
2816 }
2817
2818 ts_total.update(); // record starting point
2819
2820 if (aggregate) {
2821 print_info(out);
2822 }
2823
2824 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2825 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2826 // When we request individual parts of the analysis via the jcmd interface, it is possible
2827 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2828 // updated the aggregated data. We will then see a modified, but again consistent, view
2829 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2830 // a lock across user interaction.
2831
2832 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2833 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2834 // leading to an unnecessarily long hold time of the other locks we acquired before.
2835 ts.update(); // record starting point
2836 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2837 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2838
2839 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2840 // Unfortunately, such protection is not sufficient:
2841 // When a new nmethod is created via ciEnv::register_method(), the
2842 // Compile_lock is taken first. After some initializations,
2843 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2844 // immediately (after finalizing the oop references). To lock out concurrent
2845 // modifiers, we have to grab both locks as well in the described sequence.
2846 //
2847 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2848 // for the entire duration of aggregation and printing. That makes sure we see
2849 // a consistent picture and do not run into issues caused by concurrent alterations.
2850 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2851 !Compile_lock->owned_by_self();
2852 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2853 !CodeCache_lock->owned_by_self();
2854 bool take_global_lock_1 = allFun && should_take_Compile_lock;
2855 bool take_global_lock_2 = allFun && should_take_CodeCache_lock;
2856 bool take_function_lock_1 = !allFun && should_take_Compile_lock;
2857 bool take_function_lock_2 = !allFun && should_take_CodeCache_lock;
2858 bool take_global_locks = take_global_lock_1 || take_global_lock_2;
2859 bool take_function_locks = take_function_lock_1 || take_function_lock_2;
2860
2861 ts_global.update(); // record starting point
2862
2863 ConditionalMutexLocker mu1(Compile_lock, take_global_lock_1, Mutex::_safepoint_check_flag);
2864 ConditionalMutexLocker mu2(CodeCache_lock, take_global_lock_2, Mutex::_no_safepoint_check_flag);
2865 if (take_global_locks) {
2866 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2867 ts_global.update(); // record starting point
2868 }
2869
2870 if (aggregate) {
2871 ts.update(); // record starting point
2872 ConditionalMutexLocker mu11(Compile_lock, take_function_lock_1, Mutex::_safepoint_check_flag);
2873 ConditionalMutexLocker mu22(CodeCache_lock, take_function_lock_2, Mutex::_no_safepoint_check_flag);
2874 if (take_function_locks) {
2875 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2876 }
2877
2878 ts.update(); // record starting point
2879 CodeCache::aggregate(out, granularity);
2880 if (take_function_locks) {
2881 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2882 }
2883 }
2884
2885 if (usedSpace) CodeCache::print_usedSpace(out);
2886 if (freeSpace) CodeCache::print_freeSpace(out);
2887 if (methodCount) CodeCache::print_count(out);
2888 if (methodSpace) CodeCache::print_space(out);
2889 if (methodAge) CodeCache::print_age(out);
2890 if (methodNames) {
2891 if (allFun) {
2892 // print_names() can only be used safely if the locks have been continuously held
2893 // since aggregation begin. That is true only for function "all".
2894 CodeCache::print_names(out);
2895 } else {
2896 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2897 }
2898 }
2899 if (discard) CodeCache::discard(out);
2900
2901 if (take_global_locks) {
2902 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2903 }
2904 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2905 }