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 julong free_memory = os::free_memory();
1027 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1028 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1029 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1030
1031 // Only do attempt to start additional threads if the lock is free.
1032 if (!CompileThread_lock->try_lock()) return;
1033
1034 if (_c2_compile_queue != nullptr) {
1035 int old_c2_count = _compilers[1]->num_compiler_threads();
1036 int new_c2_count = MIN4(_c2_count,
1037 _c2_compile_queue->size() / 2,
1038 (int)(free_memory / (200*M)),
1039 (int)(available_cc_np / (128*K)));
1040
1041 for (int i = old_c2_count; i < new_c2_count; i++) {
1042 #if INCLUDE_JVMCI
1043 if (UseJVMCICompiler && !UseJVMCINativeLibrary && _compiler2_objects[i] == nullptr) {
1044 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread objects as their
1045 // existence is completely hidden from the rest of the VM (and those compiler threads can't
1046 // call Java code to do the creation anyway).
1047 //
1048 // For pure Java JVMCI we have to create new j.l.Thread objects as they are visible and we
1049 // can see unexpected thread lifecycle transitions if we bind them to new JavaThreads. For
1050 // native library JVMCI it's preferred to use the C1/C2 strategy as this avoids unnecessary
1051 // coupling with Java.
1052 if (!THREAD->can_call_java()) break;
1053 char name_buffer[256];
1054 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i);
1055 Handle thread_oop;
1056 {
1057 // We have to give up the lock temporarily for the Java calls.
1058 MutexUnlocker mu(CompileThread_lock);
1059 thread_oop = JavaThread::create_system_thread_object(name_buffer, THREAD);
1060 }
1061 if (HAS_PENDING_EXCEPTION) {
1062 if (trace_compiler_threads()) {
1063 ResourceMark rm;
1064 stringStream msg;
1065 msg.print_cr("JVMCI compiler thread creation failed:");
1066 PENDING_EXCEPTION->print_on(&msg);
1067 print_compiler_threads(msg);
1068 }
1069 CLEAR_PENDING_EXCEPTION;
1070 break;
1071 }
1072 // Check if another thread has beaten us during the Java calls.
1073 if (_compilers[1]->num_compiler_threads() != i) break;
1074 jobject thread_handle = JNIHandles::make_global(thread_oop);
1075 assert(compiler2_object(i) == nullptr, "Old one must be released!");
1076 _compiler2_objects[i] = thread_handle;
1077 }
1078 #endif
1079 guarantee(compiler2_object(i) != nullptr, "Thread oop must exist");
1080 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1081 if (ct == nullptr) break;
1082 _compilers[1]->set_num_compiler_threads(i + 1);
1083 if (trace_compiler_threads()) {
1084 ResourceMark rm;
1085 ThreadsListHandle tlh; // name() depends on the TLH.
1086 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1087 stringStream msg;
1088 msg.print("Added compiler thread %s (free memory: %dMB, available non-profiled code cache: %dMB)",
1089 ct->name(), (int)(free_memory/M), (int)(available_cc_np/M));
1090 print_compiler_threads(msg);
1091 }
1092 }
1093 }
1094
1095 if (_c1_compile_queue != nullptr) {
1096 int old_c1_count = _compilers[0]->num_compiler_threads();
1097 int new_c1_count = MIN4(_c1_count,
1098 _c1_compile_queue->size() / 4,
1099 (int)(free_memory / (100*M)),
1100 (int)(available_cc_p / (128*K)));
1101
1102 for (int i = old_c1_count; i < new_c1_count; i++) {
1103 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1104 if (ct == nullptr) break;
1105 _compilers[0]->set_num_compiler_threads(i + 1);
1106 if (trace_compiler_threads()) {
1107 ResourceMark rm;
1108 ThreadsListHandle tlh; // name() depends on the TLH.
1109 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1110 stringStream msg;
1111 msg.print("Added compiler thread %s (free memory: %dMB, available profiled code cache: %dMB)",
1112 ct->name(), (int)(free_memory/M), (int)(available_cc_p/M));
1113 print_compiler_threads(msg);
1114 }
1115 }
1116 }
1117
1118 CompileThread_lock->unlock();
1119 }
1120
1121
1122 /**
1123 * Set the methods on the stack as on_stack so that redefine classes doesn't
1124 * reclaim them. This method is executed at a safepoint.
1125 */
1126 void CompileBroker::mark_on_stack() {
1127 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1128 // Since we are at a safepoint, we do not need a lock to access
1129 // the compile queues.
1130 if (_c2_compile_queue != nullptr) {
1131 _c2_compile_queue->mark_on_stack();
1132 }
1133 if (_c1_compile_queue != nullptr) {
1134 _c1_compile_queue->mark_on_stack();
1135 }
1136 }
1137
1138 // ------------------------------------------------------------------
1139 // CompileBroker::compile_method
1140 //
1141 // Request compilation of a method.
1142 void CompileBroker::compile_method_base(const methodHandle& method,
1143 int osr_bci,
1144 int comp_level,
1145 const methodHandle& hot_method,
1146 int hot_count,
1147 CompileTask::CompileReason compile_reason,
1148 bool blocking,
1149 Thread* thread) {
1150 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1151 assert(method->method_holder()->is_instance_klass(),
1152 "sanity check");
1153 assert(!method->method_holder()->is_not_initialized(),
1154 "method holder must be initialized");
1155 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1156
1157 if (CIPrintRequests) {
1158 tty->print("request: ");
1159 method->print_short_name(tty);
1160 if (osr_bci != InvocationEntryBci) {
1161 tty->print(" osr_bci: %d", osr_bci);
1162 }
1163 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1164 if (!hot_method.is_null()) {
1165 tty->print(" hot: ");
1166 if (hot_method() != method()) {
1167 hot_method->print_short_name(tty);
1168 } else {
1169 tty->print("yes");
1170 }
1171 }
1172 tty->cr();
1173 }
1174
1175 // A request has been made for compilation. Before we do any
1176 // real work, check to see if the method has been compiled
1177 // in the meantime with a definitive result.
1178 if (compilation_is_complete(method, osr_bci, comp_level)) {
1179 return;
1180 }
1181
1182 #ifndef PRODUCT
1183 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1184 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1185 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1186 return;
1187 }
1188 }
1189 #endif
1190
1191 // If this method is already in the compile queue, then
1192 // we do not block the current thread.
1193 if (compilation_is_in_queue(method)) {
1194 // We may want to decay our counter a bit here to prevent
1195 // multiple denied requests for compilation. This is an
1196 // open compilation policy issue. Note: The other possibility,
1197 // in the case that this is a blocking compile request, is to have
1198 // all subsequent blocking requesters wait for completion of
1199 // ongoing compiles. Note that in this case we'll need a protocol
1200 // for freeing the associated compile tasks. [Or we could have
1201 // a single static monitor on which all these waiters sleep.]
1202 return;
1203 }
1204
1205 // Tiered policy requires MethodCounters to exist before adding a method to
1206 // the queue. Create if we don't have them yet.
1207 method->get_method_counters(thread);
1208
1209 // Outputs from the following MutexLocker block:
1210 CompileTask* task = nullptr;
1211 CompileQueue* queue = compile_queue(comp_level);
1212
1213 // Acquire our lock.
1214 {
1215 MutexLocker locker(thread, MethodCompileQueue_lock);
1216
1217 // Make sure the method has not slipped into the queues since
1218 // last we checked; note that those checks were "fast bail-outs".
1219 // Here we need to be more careful, see 14012000 below.
1220 if (compilation_is_in_queue(method)) {
1221 return;
1222 }
1223
1224 // We need to check again to see if the compilation has
1225 // completed. A previous compilation may have registered
1226 // some result.
1227 if (compilation_is_complete(method, osr_bci, comp_level)) {
1228 return;
1229 }
1230
1231 // We now know that this compilation is not pending, complete,
1232 // or prohibited. Assign a compile_id to this compilation
1233 // and check to see if it is in our [Start..Stop) range.
1234 int compile_id = assign_compile_id(method, osr_bci);
1235 if (compile_id == 0) {
1236 // The compilation falls outside the allowed range.
1237 return;
1238 }
1239
1240 #if INCLUDE_JVMCI
1241 if (UseJVMCICompiler && blocking) {
1242 // Don't allow blocking compiles for requests triggered by JVMCI.
1243 if (thread->is_Compiler_thread()) {
1244 blocking = false;
1245 }
1246
1247 // In libjvmci, JVMCI initialization should not deadlock with other threads
1248 if (!UseJVMCINativeLibrary) {
1249 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1250 vframeStream vfst(JavaThread::cast(thread));
1251 for (; !vfst.at_end(); vfst.next()) {
1252 if (vfst.method()->is_static_initializer() ||
1253 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1254 vfst.method()->name() == vmSymbols::loadClass_name())) {
1255 blocking = false;
1256 break;
1257 }
1258 }
1259
1260 // Don't allow blocking compilation requests to JVMCI
1261 // if JVMCI itself is not yet initialized
1262 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1263 blocking = false;
1264 }
1265 }
1266
1267 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1268 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1269 // such as the DestroyJavaVM thread.
1270 if (JVMCI::in_shutdown()) {
1271 blocking = false;
1272 }
1273 }
1274 #endif // INCLUDE_JVMCI
1275
1276 // We will enter the compilation in the queue.
1277 // 14012000: Note that this sets the queued_for_compile bits in
1278 // the target method. We can now reason that a method cannot be
1279 // queued for compilation more than once, as follows:
1280 // Before a thread queues a task for compilation, it first acquires
1281 // the compile queue lock, then checks if the method's queued bits
1282 // are set or it has already been compiled. Thus there can not be two
1283 // instances of a compilation task for the same method on the
1284 // compilation queue. Consider now the case where the compilation
1285 // thread has already removed a task for that method from the queue
1286 // and is in the midst of compiling it. In this case, the
1287 // queued_for_compile bits must be set in the method (and these
1288 // will be visible to the current thread, since the bits were set
1289 // under protection of the compile queue lock, which we hold now.
1290 // When the compilation completes, the compiler thread first sets
1291 // the compilation result and then clears the queued_for_compile
1292 // bits. Neither of these actions are protected by a barrier (or done
1293 // under the protection of a lock), so the only guarantee we have
1294 // (on machines with TSO (Total Store Order)) is that these values
1295 // will update in that order. As a result, the only combinations of
1296 // these bits that the current thread will see are, in temporal order:
1297 // <RESULT, QUEUE> :
1298 // <0, 1> : in compile queue, but not yet compiled
1299 // <1, 1> : compiled but queue bit not cleared
1300 // <1, 0> : compiled and queue bit cleared
1301 // Because we first check the queue bits then check the result bits,
1302 // we are assured that we cannot introduce a duplicate task.
1303 // Note that if we did the tests in the reverse order (i.e. check
1304 // result then check queued bit), we could get the result bit before
1305 // the compilation completed, and the queue bit after the compilation
1306 // completed, and end up introducing a "duplicate" (redundant) task.
1307 // In that case, the compiler thread should first check if a method
1308 // has already been compiled before trying to compile it.
1309 // NOTE: in the event that there are multiple compiler threads and
1310 // there is de-optimization/recompilation, things will get hairy,
1311 // and in that case it's best to protect both the testing (here) of
1312 // these bits, and their updating (here and elsewhere) under a
1313 // common lock.
1314 task = create_compile_task(queue,
1315 compile_id, method,
1316 osr_bci, comp_level,
1317 hot_method, hot_count, compile_reason,
1318 blocking);
1319 }
1320
1321 if (blocking) {
1322 wait_for_completion(task);
1323 }
1324 }
1325
1326 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1327 int comp_level,
1328 const methodHandle& hot_method, int hot_count,
1329 CompileTask::CompileReason compile_reason,
1330 TRAPS) {
1331 // Do nothing if compilebroker is not initialized or compiles are submitted on level none
1332 if (!_initialized || comp_level == CompLevel_none) {
1333 return nullptr;
1334 }
1335
1336 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1337 assert(comp != nullptr, "Ensure we have a compiler");
1338
1339 #if INCLUDE_JVMCI
1340 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1341 // JVMCI compilation is not yet initializable.
1342 return nullptr;
1343 }
1344 #endif
1345
1346 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1347 // CompileBroker::compile_method can trap and can have pending async exception.
1348 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1349 DirectivesStack::release(directive);
1350 return nm;
1351 }
1352
1353 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1354 int comp_level,
1355 const methodHandle& hot_method, int hot_count,
1356 CompileTask::CompileReason compile_reason,
1357 DirectiveSet* directive,
1358 TRAPS) {
1359
1360 // make sure arguments make sense
1361 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1362 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1363 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1364 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1365 // return quickly if possible
1366
1367 // lock, make sure that the compilation
1368 // isn't prohibited in a straightforward way.
1369 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1370 if (comp == nullptr || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1371 return nullptr;
1372 }
1373
1374 if (osr_bci == InvocationEntryBci) {
1375 // standard compilation
1376 nmethod* method_code = method->code();
1377 if (method_code != nullptr) {
1378 if (compilation_is_complete(method, osr_bci, comp_level)) {
1379 return method_code;
1380 }
1381 }
1382 if (method->is_not_compilable(comp_level)) {
1383 return nullptr;
1384 }
1385 } else {
1386 // osr compilation
1387 // We accept a higher level osr method
1388 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1389 if (nm != nullptr) return nm;
1390 if (method->is_not_osr_compilable(comp_level)) return nullptr;
1391 }
1392
1393 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1394 // some prerequisites that are compiler specific
1395 if (comp->is_c2() || comp->is_jvmci()) {
1396 InternalOOMEMark iom(THREAD);
1397 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1398 // Resolve all classes seen in the signature of the method
1399 // we are compiling.
1400 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1401 }
1402
1403 // If the method is native, do the lookup in the thread requesting
1404 // the compilation. Native lookups can load code, which is not
1405 // permitted during compilation.
1406 //
1407 // Note: A native method implies non-osr compilation which is
1408 // checked with an assertion at the entry of this method.
1409 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1410 address adr = NativeLookup::lookup(method, THREAD);
1411 if (HAS_PENDING_EXCEPTION) {
1412 // In case of an exception looking up the method, we just forget
1413 // about it. The interpreter will kick-in and throw the exception.
1414 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1415 CLEAR_PENDING_EXCEPTION;
1416 return nullptr;
1417 }
1418 assert(method->has_native_function(), "must have native code by now");
1419 }
1420
1421 // RedefineClasses() has replaced this method; just return
1422 if (method->is_old()) {
1423 return nullptr;
1424 }
1425
1426 // JVMTI -- post_compile_event requires jmethod_id() that may require
1427 // a lock the compiling thread can not acquire. Prefetch it here.
1428 if (JvmtiExport::should_post_compiled_method_load()) {
1429 method->jmethod_id();
1430 }
1431
1432 // do the compilation
1433 if (method->is_native()) {
1434 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1435 #if defined(X86) && !defined(ZERO)
1436 // The following native methods:
1437 //
1438 // java.lang.Float.intBitsToFloat
1439 // java.lang.Float.floatToRawIntBits
1440 // java.lang.Double.longBitsToDouble
1441 // java.lang.Double.doubleToRawLongBits
1442 //
1443 // are called through the interpreter even if interpreter native stubs
1444 // are not preferred (i.e., calling through adapter handlers is preferred).
1445 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1446 // if the version of the methods from the native libraries is called.
1447 // As the interpreter and the C2-intrinsified version of the methods preserves
1448 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1449 if ((UseSSE >= 1 &&
1450 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1451 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1452 (UseSSE >= 2 &&
1453 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1454 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1455 return nullptr;
1456 }
1457 #endif // X86 && !ZERO
1458
1459 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1460 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1461 //
1462 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1463 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1464 AdapterHandlerLibrary::create_native_wrapper(method);
1465 } else {
1466 return nullptr;
1467 }
1468 } else {
1469 // If the compiler is shut off due to code cache getting full
1470 // fail out now so blocking compiles dont hang the java thread
1471 if (!should_compile_new_jobs()) {
1472 return nullptr;
1473 }
1474 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1475 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1476 }
1477
1478 // return requested nmethod
1479 // We accept a higher level osr method
1480 if (osr_bci == InvocationEntryBci) {
1481 return method->code();
1482 }
1483 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1484 }
1485
1486
1487 // ------------------------------------------------------------------
1488 // CompileBroker::compilation_is_complete
1489 //
1490 // See if compilation of this method is already complete.
1491 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1492 int osr_bci,
1493 int comp_level) {
1494 bool is_osr = (osr_bci != standard_entry_bci);
1495 if (is_osr) {
1496 if (method->is_not_osr_compilable(comp_level)) {
1497 return true;
1498 } else {
1499 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1500 return (result != nullptr);
1501 }
1502 } else {
1503 if (method->is_not_compilable(comp_level)) {
1504 return true;
1505 } else {
1506 nmethod* result = method->code();
1507 if (result == nullptr) return false;
1508 return comp_level == result->comp_level();
1509 }
1510 }
1511 }
1512
1513
1514 /**
1515 * See if this compilation is already requested.
1516 *
1517 * Implementation note: there is only a single "is in queue" bit
1518 * for each method. This means that the check below is overly
1519 * conservative in the sense that an osr compilation in the queue
1520 * will block a normal compilation from entering the queue (and vice
1521 * versa). This can be remedied by a full queue search to disambiguate
1522 * cases. If it is deemed profitable, this may be done.
1523 */
1524 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1525 return method->queued_for_compilation();
1526 }
1527
1528 // ------------------------------------------------------------------
1529 // CompileBroker::compilation_is_prohibited
1530 //
1531 // See if this compilation is not allowed.
1532 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1533 bool is_native = method->is_native();
1534 // Some compilers may not support the compilation of natives.
1535 AbstractCompiler *comp = compiler(comp_level);
1536 if (is_native && (!CICompileNatives || comp == nullptr)) {
1537 method->set_not_compilable_quietly("native methods not supported", comp_level);
1538 return true;
1539 }
1540
1541 bool is_osr = (osr_bci != standard_entry_bci);
1542 // Some compilers may not support on stack replacement.
1543 if (is_osr && (!CICompileOSR || comp == nullptr)) {
1544 method->set_not_osr_compilable("OSR not supported", comp_level);
1545 return true;
1546 }
1547
1548 // The method may be explicitly excluded by the user.
1549 double scale;
1550 if (excluded || (CompilerOracle::has_option_value(method, CompileCommandEnum::CompileThresholdScaling, scale) && scale == 0)) {
1551 bool quietly = CompilerOracle::be_quiet();
1552 if (PrintCompilation && !quietly) {
1553 // This does not happen quietly...
1554 ResourceMark rm;
1555 tty->print("### Excluding %s:%s",
1556 method->is_native() ? "generation of native wrapper" : "compile",
1557 (method->is_static() ? " static" : ""));
1558 method->print_short_name(tty);
1559 tty->cr();
1560 }
1561 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1562 }
1563
1564 return false;
1565 }
1566
1567 /**
1568 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1569 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1570 * The function also allows to generate separate compilation IDs for OSR compilations.
1571 */
1572 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1573 #ifdef ASSERT
1574 bool is_osr = (osr_bci != standard_entry_bci);
1575 int id;
1576 if (method->is_native()) {
1577 assert(!is_osr, "can't be osr");
1578 // Adapters, native wrappers and method handle intrinsics
1579 // should be generated always.
1580 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1581 } else if (CICountOSR && is_osr) {
1582 id = Atomic::add(&_osr_compilation_id, 1);
1583 if (CIStartOSR <= id && id < CIStopOSR) {
1584 return id;
1585 }
1586 } else {
1587 id = Atomic::add(&_compilation_id, 1);
1588 if (CIStart <= id && id < CIStop) {
1589 return id;
1590 }
1591 }
1592
1593 // Method was not in the appropriate compilation range.
1594 method->set_not_compilable_quietly("Not in requested compile id range");
1595 return 0;
1596 #else
1597 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1598 // only _compilation_id is incremented.
1599 return Atomic::add(&_compilation_id, 1);
1600 #endif
1601 }
1602
1603 // ------------------------------------------------------------------
1604 // CompileBroker::assign_compile_id_unlocked
1605 //
1606 // Public wrapper for assign_compile_id that acquires the needed locks
1607 int CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1608 MutexLocker locker(thread, MethodCompileQueue_lock);
1609 return assign_compile_id(method, osr_bci);
1610 }
1611
1612 // ------------------------------------------------------------------
1613 // CompileBroker::create_compile_task
1614 //
1615 // Create a CompileTask object representing the current request for
1616 // compilation. Add this task to the queue.
1617 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1618 int compile_id,
1619 const methodHandle& method,
1620 int osr_bci,
1621 int comp_level,
1622 const methodHandle& hot_method,
1623 int hot_count,
1624 CompileTask::CompileReason compile_reason,
1625 bool blocking) {
1626 CompileTask* new_task = CompileTask::allocate();
1627 new_task->initialize(compile_id, method, osr_bci, comp_level,
1628 hot_method, hot_count, compile_reason,
1629 blocking);
1630 queue->add(new_task);
1631 return new_task;
1632 }
1633
1634 #if INCLUDE_JVMCI
1635 // The number of milliseconds to wait before checking if
1636 // JVMCI compilation has made progress.
1637 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1638
1639 // The number of JVMCI compilation progress checks that must fail
1640 // before unblocking a thread waiting for a blocking compilation.
1641 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1642
1643 /**
1644 * Waits for a JVMCI compiler to complete a given task. This thread
1645 * waits until either the task completes or it sees no JVMCI compilation
1646 * progress for N consecutive milliseconds where N is
1647 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1648 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1649 *
1650 * @return true if this thread needs to free/recycle the task
1651 */
1652 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1653 assert(UseJVMCICompiler, "sanity");
1654 MonitorLocker ml(thread, task->lock());
1655 int progress_wait_attempts = 0;
1656 jint thread_jvmci_compilation_ticks = 0;
1657 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1658 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1659 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1660 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1661
1662 bool progress;
1663 if (jvmci_compile_state != nullptr) {
1664 jint ticks = jvmci_compile_state->compilation_ticks();
1665 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1666 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1667 thread_jvmci_compilation_ticks = ticks;
1668 } else {
1669 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1670 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1671 // compilation ticks to determine whether JVMCI compilation
1672 // is still making progress through the JVMCI compiler queue.
1673 jint ticks = jvmci->global_compilation_ticks();
1674 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1675 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1676 global_jvmci_compilation_ticks = ticks;
1677 }
1678
1679 if (!progress) {
1680 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1681 if (PrintCompilation) {
1682 task->print(tty, "wait for blocking compilation timed out");
1683 }
1684 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1685 break;
1686 }
1687 } else {
1688 progress_wait_attempts = 0;
1689 }
1690 }
1691 task->clear_waiter();
1692 return task->is_complete();
1693 }
1694 #endif
1695
1696 /**
1697 * Wait for the compilation task to complete.
1698 */
1699 void CompileBroker::wait_for_completion(CompileTask* task) {
1700 if (CIPrintCompileQueue) {
1701 ttyLocker ttyl;
1702 tty->print_cr("BLOCKING FOR COMPILE");
1703 }
1704
1705 assert(task->is_blocking(), "can only wait on blocking task");
1706
1707 JavaThread* thread = JavaThread::current();
1708
1709 methodHandle method(thread, task->method());
1710 bool free_task;
1711 #if INCLUDE_JVMCI
1712 AbstractCompiler* comp = compiler(task->comp_level());
1713 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) {
1714 // It may return before compilation is completed.
1715 // Note that libjvmci should not pre-emptively unblock
1716 // a thread waiting for a compilation as it does not call
1717 // Java code and so is not deadlock prone like jarjvmci.
1718 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1719 } else
1720 #endif
1721 {
1722 MonitorLocker ml(thread, task->lock());
1723 free_task = true;
1724 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1725 ml.wait();
1726 }
1727 }
1728
1729 if (free_task) {
1730 if (is_compilation_disabled_forever()) {
1731 CompileTask::free(task);
1732 return;
1733 }
1734
1735 // It is harmless to check this status without the lock, because
1736 // completion is a stable property (until the task object is recycled).
1737 assert(task->is_complete(), "Compilation should have completed");
1738
1739 // By convention, the waiter is responsible for recycling a
1740 // blocking CompileTask. Since there is only one waiter ever
1741 // waiting on a CompileTask, we know that no one else will
1742 // be using this CompileTask; we can free it.
1743 CompileTask::free(task);
1744 }
1745 }
1746
1747 /**
1748 * Initialize compiler thread(s) + compiler object(s). The postcondition
1749 * of this function is that the compiler runtimes are initialized and that
1750 * compiler threads can start compiling.
1751 */
1752 bool CompileBroker::init_compiler_runtime() {
1753 CompilerThread* thread = CompilerThread::current();
1754 AbstractCompiler* comp = thread->compiler();
1755 // Final sanity check - the compiler object must exist
1756 guarantee(comp != nullptr, "Compiler object must exist");
1757
1758 {
1759 // Must switch to native to allocate ci_env
1760 ThreadToNativeFromVM ttn(thread);
1761 ciEnv ci_env((CompileTask*)nullptr);
1762 // Cache Jvmti state
1763 ci_env.cache_jvmti_state();
1764 // Cache DTrace flags
1765 ci_env.cache_dtrace_flags();
1766
1767 // Switch back to VM state to do compiler initialization
1768 ThreadInVMfromNative tv(thread);
1769
1770 // Perform per-thread and global initializations
1771 comp->initialize();
1772 }
1773
1774 if (comp->is_failed()) {
1775 disable_compilation_forever();
1776 // If compiler initialization failed, no compiler thread that is specific to a
1777 // particular compiler runtime will ever start to compile methods.
1778 shutdown_compiler_runtime(comp, thread);
1779 return false;
1780 }
1781
1782 // C1 specific check
1783 if (comp->is_c1() && (thread->get_buffer_blob() == nullptr)) {
1784 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1785 return false;
1786 }
1787
1788 return true;
1789 }
1790
1791 void CompileBroker::free_buffer_blob_if_allocated(CompilerThread* thread) {
1792 BufferBlob* blob = thread->get_buffer_blob();
1793 if (blob != nullptr) {
1794 blob->purge();
1795 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1796 CodeCache::free(blob);
1797 }
1798 }
1799
1800 /**
1801 * If C1 and/or C2 initialization failed, we shut down all compilation.
1802 * We do this to keep things simple. This can be changed if it ever turns
1803 * out to be a problem.
1804 */
1805 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1806 free_buffer_blob_if_allocated(thread);
1807
1808 if (comp->should_perform_shutdown()) {
1809 // There are two reasons for shutting down the compiler
1810 // 1) compiler runtime initialization failed
1811 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1812 warning("%s initialization failed. Shutting down all compilers", comp->name());
1813
1814 // Only one thread per compiler runtime object enters here
1815 // Set state to shut down
1816 comp->set_shut_down();
1817
1818 // Delete all queued compilation tasks to make compiler threads exit faster.
1819 if (_c1_compile_queue != nullptr) {
1820 _c1_compile_queue->free_all();
1821 }
1822
1823 if (_c2_compile_queue != nullptr) {
1824 _c2_compile_queue->free_all();
1825 }
1826
1827 // Set flags so that we continue execution with using interpreter only.
1828 UseCompiler = false;
1829 UseInterpreter = true;
1830
1831 // We could delete compiler runtimes also. However, there are references to
1832 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1833 // fail. This can be done later if necessary.
1834 }
1835 }
1836
1837 /**
1838 * Helper function to create new or reuse old CompileLog.
1839 */
1840 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1841 if (!LogCompilation) return nullptr;
1842
1843 AbstractCompiler *compiler = ct->compiler();
1844 bool c1 = compiler->is_c1();
1845 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1846 assert(compiler_objects != nullptr, "must be initialized at this point");
1847 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1848 assert(logs != nullptr, "must be initialized at this point");
1849 int count = c1 ? _c1_count : _c2_count;
1850
1851 // Find Compiler number by its threadObj.
1852 oop compiler_obj = ct->threadObj();
1853 int compiler_number = 0;
1854 bool found = false;
1855 for (; compiler_number < count; compiler_number++) {
1856 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1857 found = true;
1858 break;
1859 }
1860 }
1861 assert(found, "Compiler must exist at this point");
1862
1863 // Determine pointer for this thread's log.
1864 CompileLog** log_ptr = &logs[compiler_number];
1865
1866 // Return old one if it exists.
1867 CompileLog* log = *log_ptr;
1868 if (log != nullptr) {
1869 ct->init_log(log);
1870 return log;
1871 }
1872
1873 // Create a new one and remember it.
1874 init_compiler_thread_log();
1875 log = ct->log();
1876 *log_ptr = log;
1877 return log;
1878 }
1879
1880 // ------------------------------------------------------------------
1881 // CompileBroker::compiler_thread_loop
1882 //
1883 // The main loop run by a CompilerThread.
1884 void CompileBroker::compiler_thread_loop() {
1885 CompilerThread* thread = CompilerThread::current();
1886 CompileQueue* queue = thread->queue();
1887 // For the thread that initializes the ciObjectFactory
1888 // this resource mark holds all the shared objects
1889 ResourceMark rm;
1890
1891 // First thread to get here will initialize the compiler interface
1892
1893 {
1894 ASSERT_IN_VM;
1895 MutexLocker only_one (thread, CompileThread_lock);
1896 if (!ciObjectFactory::is_initialized()) {
1897 ciObjectFactory::initialize();
1898 }
1899 }
1900
1901 // Open a log.
1902 CompileLog* log = get_log(thread);
1903 if (log != nullptr) {
1904 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1905 thread->name(),
1906 os::current_thread_id(),
1907 os::current_process_id());
1908 log->stamp();
1909 log->end_elem();
1910 }
1911
1912 // If compiler thread/runtime initialization fails, exit the compiler thread
1913 if (!init_compiler_runtime()) {
1914 return;
1915 }
1916
1917 thread->start_idle_timer();
1918
1919 // Poll for new compilation tasks as long as the JVM runs. Compilation
1920 // should only be disabled if something went wrong while initializing the
1921 // compiler runtimes. This, in turn, should not happen. The only known case
1922 // when compiler runtime initialization fails is if there is not enough free
1923 // space in the code cache to generate the necessary stubs, etc.
1924 while (!is_compilation_disabled_forever()) {
1925 // We need this HandleMark to avoid leaking VM handles.
1926 HandleMark hm(thread);
1927
1928 CompileTask* task = queue->get(thread);
1929 if (task == nullptr) {
1930 if (UseDynamicNumberOfCompilerThreads) {
1931 // Access compiler_count under lock to enforce consistency.
1932 MutexLocker only_one(CompileThread_lock);
1933 if (can_remove(thread, true)) {
1934 if (trace_compiler_threads()) {
1935 ResourceMark rm;
1936 stringStream msg;
1937 msg.print("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1938 thread->name(), thread->idle_time_millis());
1939 print_compiler_threads(msg);
1940 }
1941
1942 // Notify compiler that the compiler thread is about to stop
1943 thread->compiler()->stopping_compiler_thread(thread);
1944
1945 free_buffer_blob_if_allocated(thread);
1946 return; // Stop this thread.
1947 }
1948 }
1949 } else {
1950 // Assign the task to the current thread. Mark this compilation
1951 // thread as active for the profiler.
1952 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1953 // occurs after fetching the compile task off the queue.
1954 CompileTaskWrapper ctw(task);
1955 methodHandle method(thread, task->method());
1956
1957 // Never compile a method if breakpoints are present in it
1958 if (method()->number_of_breakpoints() == 0) {
1959 // Compile the method.
1960 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1961 invoke_compiler_on_method(task);
1962 thread->start_idle_timer();
1963 } else {
1964 // After compilation is disabled, remove remaining methods from queue
1965 method->clear_queued_for_compilation();
1966 task->set_failure_reason("compilation is disabled");
1967 }
1968 } else {
1969 task->set_failure_reason("breakpoints are present");
1970 }
1971
1972 if (UseDynamicNumberOfCompilerThreads) {
1973 possibly_add_compiler_threads(thread);
1974 assert(!thread->has_pending_exception(), "should have been handled");
1975 }
1976 }
1977 }
1978
1979 // Shut down compiler runtime
1980 shutdown_compiler_runtime(thread->compiler(), thread);
1981 }
1982
1983 // ------------------------------------------------------------------
1984 // CompileBroker::init_compiler_thread_log
1985 //
1986 // Set up state required by +LogCompilation.
1987 void CompileBroker::init_compiler_thread_log() {
1988 CompilerThread* thread = CompilerThread::current();
1989 char file_name[4*K];
1990 FILE* fp = nullptr;
1991 intx thread_id = os::current_thread_id();
1992 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1993 const char* dir = (try_temp_dir ? os::get_temp_directory() : nullptr);
1994 if (dir == nullptr) {
1995 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1996 thread_id, os::current_process_id());
1997 } else {
1998 jio_snprintf(file_name, sizeof(file_name),
1999 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
2000 os::file_separator(), thread_id, os::current_process_id());
2001 }
2002
2003 fp = os::fopen(file_name, "wt");
2004 if (fp != nullptr) {
2005 if (LogCompilation && Verbose) {
2006 tty->print_cr("Opening compilation log %s", file_name);
2007 }
2008 CompileLog* log = new(mtCompiler) CompileLog(file_name, fp, thread_id);
2009 if (log == nullptr) {
2010 fclose(fp);
2011 return;
2012 }
2013 thread->init_log(log);
2014
2015 if (xtty != nullptr) {
2016 ttyLocker ttyl;
2017 // Record any per thread log files
2018 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2019 }
2020 return;
2021 }
2022 }
2023 warning("Cannot open log file: %s", file_name);
2024 }
2025
2026 void CompileBroker::log_metaspace_failure() {
2027 const char* message = "some methods may not be compiled because metaspace "
2028 "is out of memory";
2029 if (CompilationLog::log() != nullptr) {
2030 CompilationLog::log()->log_metaspace_failure(message);
2031 }
2032 if (PrintCompilation) {
2033 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2034 }
2035 }
2036
2037
2038 // ------------------------------------------------------------------
2039 // CompileBroker::set_should_block
2040 //
2041 // Set _should_block.
2042 // Call this from the VM, with Threads_lock held and a safepoint requested.
2043 void CompileBroker::set_should_block() {
2044 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2045 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2046 #ifndef PRODUCT
2047 if (PrintCompilation && (Verbose || WizardMode))
2048 tty->print_cr("notifying compiler thread pool to block");
2049 #endif
2050 _should_block = true;
2051 }
2052
2053 // ------------------------------------------------------------------
2054 // CompileBroker::maybe_block
2055 //
2056 // Call this from the compiler at convenient points, to poll for _should_block.
2057 void CompileBroker::maybe_block() {
2058 if (_should_block) {
2059 #ifndef PRODUCT
2060 if (PrintCompilation && (Verbose || WizardMode))
2061 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2062 #endif
2063 ThreadInVMfromNative tivfn(JavaThread::current());
2064 }
2065 }
2066
2067 // wrapper for CodeCache::print_summary()
2068 static void codecache_print(bool detailed)
2069 {
2070 stringStream s;
2071 // Dump code cache into a buffer before locking the tty,
2072 {
2073 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2074 CodeCache::print_summary(&s, detailed);
2075 }
2076 ttyLocker ttyl;
2077 tty->print("%s", s.freeze());
2078 }
2079
2080 // wrapper for CodeCache::print_summary() using outputStream
2081 static void codecache_print(outputStream* out, bool detailed) {
2082 stringStream s;
2083
2084 // Dump code cache into a buffer
2085 {
2086 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2087 CodeCache::print_summary(&s, detailed);
2088 }
2089
2090 char* remaining_log = s.as_string();
2091 while (*remaining_log != '\0') {
2092 char* eol = strchr(remaining_log, '\n');
2093 if (eol == nullptr) {
2094 out->print_cr("%s", remaining_log);
2095 remaining_log = remaining_log + strlen(remaining_log);
2096 } else {
2097 *eol = '\0';
2098 out->print_cr("%s", remaining_log);
2099 remaining_log = eol + 1;
2100 }
2101 }
2102 }
2103
2104 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env,
2105 int compilable, const char* failure_reason) {
2106 if (!AbortVMOnCompilationFailure) {
2107 return;
2108 }
2109 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2110 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2111 }
2112 if (compilable == ciEnv::MethodCompilable_never) {
2113 fatal("Never compilable: %s", failure_reason);
2114 }
2115 }
2116
2117 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2118 assert(task != nullptr, "invariant");
2119 CompilerEvent::CompilationEvent::post(event,
2120 task->compile_id(),
2121 task->compiler()->type(),
2122 task->method(),
2123 task->comp_level(),
2124 task->is_success(),
2125 task->osr_bci() != CompileBroker::standard_entry_bci,
2126 task->nm_total_size(),
2127 task->num_inlined_bytecodes(),
2128 task->arena_bytes());
2129 }
2130
2131 int DirectivesStack::_depth = 0;
2132 CompilerDirectives* DirectivesStack::_top = nullptr;
2133 CompilerDirectives* DirectivesStack::_bottom = nullptr;
2134
2135 // Acquires Compilation_lock and waits for it to be notified
2136 // as long as WhiteBox::compilation_locked is true.
2137 static void whitebox_lock_compilation() {
2138 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2139 while (WhiteBox::compilation_locked) {
2140 locker.wait();
2141 }
2142 }
2143
2144 // ------------------------------------------------------------------
2145 // CompileBroker::invoke_compiler_on_method
2146 //
2147 // Compile a method.
2148 //
2149 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2150 task->print_ul();
2151 elapsedTimer time;
2152
2153 DirectiveSet* directive = task->directive();
2154 if (directive->PrintCompilationOption) {
2155 ResourceMark rm;
2156 task->print_tty();
2157 }
2158
2159 CompilerThread* thread = CompilerThread::current();
2160 ResourceMark rm(thread);
2161
2162 if (CompilationLog::log() != nullptr) {
2163 CompilationLog::log()->log_compile(thread, task);
2164 }
2165
2166 // Common flags.
2167 int compile_id = task->compile_id();
2168 int osr_bci = task->osr_bci();
2169 bool is_osr = (osr_bci != standard_entry_bci);
2170 bool should_log = (thread->log() != nullptr);
2171 bool should_break = false;
2172 const int task_level = task->comp_level();
2173 AbstractCompiler* comp = task->compiler();
2174 {
2175 // create the handle inside it's own block so it can't
2176 // accidentally be referenced once the thread transitions to
2177 // native. The NoHandleMark before the transition should catch
2178 // any cases where this occurs in the future.
2179 methodHandle method(thread, task->method());
2180
2181 assert(!method->is_native(), "no longer compile natives");
2182
2183 // Update compile information when using perfdata.
2184 if (UsePerfData) {
2185 update_compile_perf_data(thread, method, is_osr);
2186 }
2187
2188 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2189 }
2190
2191 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2192 if (should_log && !directive->LogOption) {
2193 should_log = false;
2194 }
2195
2196 // Allocate a new set of JNI handles.
2197 JNIHandleMark jhm(thread);
2198 Method* target_handle = task->method();
2199 int compilable = ciEnv::MethodCompilable;
2200 const char* failure_reason = nullptr;
2201 bool failure_reason_on_C_heap = false;
2202 const char* retry_message = nullptr;
2203
2204 #if INCLUDE_JVMCI
2205 if (UseJVMCICompiler && comp != nullptr && comp->is_jvmci()) {
2206 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2207
2208 TraceTime t1("compilation", &time);
2209 EventCompilation event;
2210 JVMCICompileState compile_state(task, jvmci);
2211 JVMCIRuntime *runtime = nullptr;
2212
2213 if (JVMCI::in_shutdown()) {
2214 failure_reason = "in JVMCI shutdown";
2215 retry_message = "not retryable";
2216 compilable = ciEnv::MethodCompilable_never;
2217 } else if (compile_state.target_method_is_old()) {
2218 // Skip redefined methods
2219 failure_reason = "redefined method";
2220 retry_message = "not retryable";
2221 compilable = ciEnv::MethodCompilable_never;
2222 } else {
2223 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2224 if (env.init_error() != JNI_OK) {
2225 const char* msg = env.init_error_msg();
2226 failure_reason = os::strdup(err_msg("Error attaching to libjvmci (err: %d, %s)",
2227 env.init_error(), msg == nullptr ? "unknown" : msg), mtJVMCI);
2228 bool reason_on_C_heap = true;
2229 // In case of JNI_ENOMEM, there's a good chance a subsequent attempt to create libjvmci or attach to it
2230 // might succeed. Other errors most likely indicate a non-recoverable error in the JVMCI runtime.
2231 bool retryable = env.init_error() == JNI_ENOMEM;
2232 compile_state.set_failure(retryable, failure_reason, reason_on_C_heap);
2233 }
2234 if (failure_reason == nullptr) {
2235 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2236 // Must switch to native to block
2237 ThreadToNativeFromVM ttn(thread);
2238 whitebox_lock_compilation();
2239 }
2240 methodHandle method(thread, target_handle);
2241 runtime = env.runtime();
2242 runtime->compile_method(&env, jvmci, method, osr_bci);
2243
2244 failure_reason = compile_state.failure_reason();
2245 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2246 if (!compile_state.retryable()) {
2247 retry_message = "not retryable";
2248 compilable = ciEnv::MethodCompilable_not_at_tier;
2249 }
2250 if (!task->is_success()) {
2251 assert(failure_reason != nullptr, "must specify failure_reason");
2252 }
2253 }
2254 }
2255 if (!task->is_success() && !JVMCI::in_shutdown()) {
2256 handle_compile_error(thread, task, nullptr, compilable, failure_reason);
2257 }
2258 if (event.should_commit()) {
2259 post_compilation_event(event, task);
2260 }
2261
2262 if (runtime != nullptr) {
2263 runtime->post_compile(thread);
2264 }
2265 } else
2266 #endif // INCLUDE_JVMCI
2267 {
2268 NoHandleMark nhm;
2269 ThreadToNativeFromVM ttn(thread);
2270
2271 ciEnv ci_env(task);
2272 if (should_break) {
2273 ci_env.set_break_at_compile(true);
2274 }
2275 if (should_log) {
2276 ci_env.set_log(thread->log());
2277 }
2278 assert(thread->env() == &ci_env, "set by ci_env");
2279 // The thread-env() field is cleared in ~CompileTaskWrapper.
2280
2281 // Cache Jvmti state
2282 bool method_is_old = ci_env.cache_jvmti_state();
2283
2284 // Skip redefined methods
2285 if (method_is_old) {
2286 ci_env.record_method_not_compilable("redefined method", true);
2287 }
2288
2289 // Cache DTrace flags
2290 ci_env.cache_dtrace_flags();
2291
2292 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2293
2294 TraceTime t1("compilation", &time);
2295 EventCompilation event;
2296
2297 if (comp == nullptr) {
2298 ci_env.record_method_not_compilable("no compiler");
2299 } else if (!ci_env.failing()) {
2300 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2301 whitebox_lock_compilation();
2302 }
2303 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2304
2305 /* Repeat compilation without installing code for profiling purposes */
2306 int repeat_compilation_count = directive->RepeatCompilationOption;
2307 while (repeat_compilation_count > 0) {
2308 ResourceMark rm(thread);
2309 task->print_ul("NO CODE INSTALLED");
2310 comp->compile_method(&ci_env, target, osr_bci, false, directive);
2311 repeat_compilation_count--;
2312 }
2313 }
2314
2315 DirectivesStack::release(directive);
2316
2317 if (!ci_env.failing() && !task->is_success()) {
2318 assert(ci_env.failure_reason() != nullptr, "expect failure reason");
2319 assert(false, "compiler should always document failure: %s", ci_env.failure_reason());
2320 // The compiler elected, without comment, not to register a result.
2321 // Do not attempt further compilations of this method.
2322 ci_env.record_method_not_compilable("compile failed");
2323 }
2324
2325 // Copy this bit to the enclosing block:
2326 compilable = ci_env.compilable();
2327
2328 if (ci_env.failing()) {
2329 // Duplicate the failure reason string, so that it outlives ciEnv
2330 failure_reason = os::strdup(ci_env.failure_reason(), mtCompiler);
2331 failure_reason_on_C_heap = true;
2332 retry_message = ci_env.retry_message();
2333 ci_env.report_failure(failure_reason);
2334 }
2335
2336 if (ci_env.failing()) {
2337 handle_compile_error(thread, task, &ci_env, compilable, failure_reason);
2338 }
2339 if (event.should_commit()) {
2340 post_compilation_event(event, task);
2341 }
2342 }
2343
2344 if (failure_reason != nullptr) {
2345 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2346 if (CompilationLog::log() != nullptr) {
2347 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message);
2348 }
2349 if (PrintCompilation) {
2350 FormatBufferResource msg = retry_message != nullptr ?
2351 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2352 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2353 task->print(tty, msg);
2354 }
2355 }
2356
2357 methodHandle method(thread, task->method());
2358
2359 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2360
2361 collect_statistics(thread, time, task);
2362
2363 if (PrintCompilation && PrintCompilation2) {
2364 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2365 tty->print("%4d ", compile_id); // print compilation number
2366 tty->print("%s ", (is_osr ? "%" : " "));
2367 if (task->is_success()) {
2368 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size());
2369 }
2370 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2371 }
2372
2373 Log(compilation, codecache) log;
2374 if (log.is_debug()) {
2375 LogStream ls(log.debug());
2376 codecache_print(&ls, /* detailed= */ false);
2377 }
2378 if (PrintCodeCacheOnCompilation) {
2379 codecache_print(/* detailed= */ false);
2380 }
2381 // Disable compilation, if required.
2382 switch (compilable) {
2383 case ciEnv::MethodCompilable_never:
2384 if (is_osr)
2385 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2386 else
2387 method->set_not_compilable_quietly("MethodCompilable_never");
2388 break;
2389 case ciEnv::MethodCompilable_not_at_tier:
2390 if (is_osr)
2391 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2392 else
2393 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2394 break;
2395 }
2396
2397 // Note that the queued_for_compilation bits are cleared without
2398 // protection of a mutex. [They were set by the requester thread,
2399 // when adding the task to the compile queue -- at which time the
2400 // compile queue lock was held. Subsequently, we acquired the compile
2401 // queue lock to get this task off the compile queue; thus (to belabour
2402 // the point somewhat) our clearing of the bits must be occurring
2403 // only after the setting of the bits. See also 14012000 above.
2404 method->clear_queued_for_compilation();
2405 }
2406
2407 /**
2408 * The CodeCache is full. Print warning and disable compilation.
2409 * Schedule code cache cleaning so compilation can continue later.
2410 * This function needs to be called only from CodeCache::allocate(),
2411 * since we currently handle a full code cache uniformly.
2412 */
2413 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) {
2414 UseInterpreter = true;
2415 if (UseCompiler || AlwaysCompileLoopMethods ) {
2416 if (xtty != nullptr) {
2417 stringStream s;
2418 // Dump code cache state into a buffer before locking the tty,
2419 // because log_state() will use locks causing lock conflicts.
2420 CodeCache::log_state(&s);
2421 // Lock to prevent tearing
2422 ttyLocker ttyl;
2423 xtty->begin_elem("code_cache_full");
2424 xtty->print("%s", s.freeze());
2425 xtty->stamp();
2426 xtty->end_elem();
2427 }
2428
2429 #ifndef PRODUCT
2430 if (ExitOnFullCodeCache) {
2431 codecache_print(/* detailed= */ true);
2432 before_exit(JavaThread::current());
2433 exit_globals(); // will delete tty
2434 vm_direct_exit(1);
2435 }
2436 #endif
2437 if (UseCodeCacheFlushing) {
2438 // Since code cache is full, immediately stop new compiles
2439 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2440 log_info(codecache)("Code cache is full - disabling compilation");
2441 }
2442 } else {
2443 disable_compilation_forever();
2444 }
2445
2446 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2447 }
2448 }
2449
2450 // ------------------------------------------------------------------
2451 // CompileBroker::update_compile_perf_data
2452 //
2453 // Record this compilation for debugging purposes.
2454 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2455 ResourceMark rm;
2456 char* method_name = method->name()->as_C_string();
2457 char current_method[CompilerCounters::cmname_buffer_length];
2458 size_t maxLen = CompilerCounters::cmname_buffer_length;
2459
2460 const char* class_name = method->method_holder()->name()->as_C_string();
2461
2462 size_t s1len = strlen(class_name);
2463 size_t s2len = strlen(method_name);
2464
2465 // check if we need to truncate the string
2466 if (s1len + s2len + 2 > maxLen) {
2467
2468 // the strategy is to lop off the leading characters of the
2469 // class name and the trailing characters of the method name.
2470
2471 if (s2len + 2 > maxLen) {
2472 // lop of the entire class name string, let snprintf handle
2473 // truncation of the method name.
2474 class_name += s1len; // null string
2475 }
2476 else {
2477 // lop off the extra characters from the front of the class name
2478 class_name += ((s1len + s2len + 2) - maxLen);
2479 }
2480 }
2481
2482 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2483
2484 int last_compile_type = normal_compile;
2485 if (CICountOSR && is_osr) {
2486 last_compile_type = osr_compile;
2487 } else if (CICountNative && method->is_native()) {
2488 last_compile_type = native_compile;
2489 }
2490
2491 CompilerCounters* counters = thread->counters();
2492 counters->set_current_method(current_method);
2493 counters->set_compile_type((jlong) last_compile_type);
2494 }
2495
2496 // ------------------------------------------------------------------
2497 // CompileBroker::collect_statistics
2498 //
2499 // Collect statistics about the compilation.
2500
2501 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2502 bool success = task->is_success();
2503 methodHandle method (thread, task->method());
2504 int compile_id = task->compile_id();
2505 bool is_osr = (task->osr_bci() != standard_entry_bci);
2506 const int comp_level = task->comp_level();
2507 CompilerCounters* counters = thread->counters();
2508
2509 MutexLocker locker(CompileStatistics_lock);
2510
2511 // _perf variables are production performance counters which are
2512 // updated regardless of the setting of the CITime and CITimeEach flags
2513 //
2514
2515 // account all time, including bailouts and failures in this counter;
2516 // C1 and C2 counters are counting both successful and unsuccessful compiles
2517 _t_total_compilation.add(time);
2518
2519 if (!success) {
2520 _total_bailout_count++;
2521 if (UsePerfData) {
2522 _perf_last_failed_method->set_value(counters->current_method());
2523 _perf_last_failed_type->set_value(counters->compile_type());
2524 _perf_total_bailout_count->inc();
2525 }
2526 _t_bailedout_compilation.add(time);
2527 } else if (!task->is_success()) {
2528 if (UsePerfData) {
2529 _perf_last_invalidated_method->set_value(counters->current_method());
2530 _perf_last_invalidated_type->set_value(counters->compile_type());
2531 _perf_total_invalidated_count->inc();
2532 }
2533 _total_invalidated_count++;
2534 _t_invalidated_compilation.add(time);
2535 } else {
2536 // Compilation succeeded
2537
2538 // update compilation ticks - used by the implementation of
2539 // java.lang.management.CompilationMXBean
2540 _perf_total_compilation->inc(time.ticks());
2541 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2542
2543 if (CITime) {
2544 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2545 if (is_osr) {
2546 _t_osr_compilation.add(time);
2547 _sum_osr_bytes_compiled += bytes_compiled;
2548 } else {
2549 _t_standard_compilation.add(time);
2550 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2551 }
2552
2553 // Collect statistic per compilation level
2554 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2555 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2556 if (is_osr) {
2557 stats->_osr.update(time, bytes_compiled);
2558 } else {
2559 stats->_standard.update(time, bytes_compiled);
2560 }
2561 stats->_nmethods_size += task->nm_total_size();
2562 stats->_nmethods_code_size += task->nm_insts_size();
2563 } else {
2564 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2565 }
2566
2567 // Collect statistic per compiler
2568 AbstractCompiler* comp = compiler(comp_level);
2569 if (comp) {
2570 CompilerStatistics* stats = comp->stats();
2571 if (is_osr) {
2572 stats->_osr.update(time, bytes_compiled);
2573 } else {
2574 stats->_standard.update(time, bytes_compiled);
2575 }
2576 stats->_nmethods_size += task->nm_total_size();
2577 stats->_nmethods_code_size += task->nm_insts_size();
2578 } else { // if (!comp)
2579 assert(false, "Compiler object must exist");
2580 }
2581 }
2582
2583 if (UsePerfData) {
2584 // save the name of the last method compiled
2585 _perf_last_method->set_value(counters->current_method());
2586 _perf_last_compile_type->set_value(counters->compile_type());
2587 _perf_last_compile_size->set_value(method->code_size() +
2588 task->num_inlined_bytecodes());
2589 if (is_osr) {
2590 _perf_osr_compilation->inc(time.ticks());
2591 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2592 } else {
2593 _perf_standard_compilation->inc(time.ticks());
2594 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2595 }
2596 }
2597
2598 if (CITimeEach) {
2599 double compile_time = time.seconds();
2600 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2601 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2602 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2603 }
2604
2605 // Collect counts of successful compilations
2606 _sum_nmethod_size += task->nm_total_size();
2607 _sum_nmethod_code_size += task->nm_insts_size();
2608 _total_compile_count++;
2609
2610 if (UsePerfData) {
2611 _perf_sum_nmethod_size->inc( task->nm_total_size());
2612 _perf_sum_nmethod_code_size->inc(task->nm_insts_size());
2613 _perf_total_compile_count->inc();
2614 }
2615
2616 if (is_osr) {
2617 if (UsePerfData) _perf_total_osr_compile_count->inc();
2618 _total_osr_compile_count++;
2619 } else {
2620 if (UsePerfData) _perf_total_standard_compile_count->inc();
2621 _total_standard_compile_count++;
2622 }
2623 }
2624 // set the current method for the thread to null
2625 if (UsePerfData) counters->set_current_method("");
2626 }
2627
2628 const char* CompileBroker::compiler_name(int comp_level) {
2629 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2630 if (comp == nullptr) {
2631 return "no compiler";
2632 } else {
2633 return (comp->name());
2634 }
2635 }
2636
2637 jlong CompileBroker::total_compilation_ticks() {
2638 return _perf_total_compilation != nullptr ? _perf_total_compilation->get_value() : 0;
2639 }
2640
2641 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2642 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}",
2643 name, stats->bytes_per_second(),
2644 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2645 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2646 stats->_nmethods_size, stats->_nmethods_code_size);
2647 }
2648
2649 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2650 if (per_compiler) {
2651 if (aggregate) {
2652 tty->cr();
2653 tty->print_cr("Individual compiler times (for compiled methods only)");
2654 tty->print_cr("------------------------------------------------");
2655 tty->cr();
2656 }
2657 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2658 AbstractCompiler* comp = _compilers[i];
2659 if (comp != nullptr) {
2660 print_times(comp->name(), comp->stats());
2661 }
2662 }
2663 if (aggregate) {
2664 tty->cr();
2665 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2666 tty->print_cr("------------------------------------------------");
2667 tty->cr();
2668 }
2669 char tier_name[256];
2670 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2671 CompilerStatistics* stats = &_stats_per_level[tier-1];
2672 os::snprintf_checked(tier_name, sizeof(tier_name), "Tier%d", tier);
2673 print_times(tier_name, stats);
2674 }
2675 }
2676
2677 if (!aggregate) {
2678 return;
2679 }
2680
2681 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2682 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2683 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2684
2685 uint standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2686 uint osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2687
2688 uint standard_compile_count = CompileBroker::_total_standard_compile_count;
2689 uint osr_compile_count = CompileBroker::_total_osr_compile_count;
2690 uint total_compile_count = CompileBroker::_total_compile_count;
2691 uint total_bailout_count = CompileBroker::_total_bailout_count;
2692 uint total_invalidated_count = CompileBroker::_total_invalidated_count;
2693
2694 uint nmethods_code_size = CompileBroker::_sum_nmethod_code_size;
2695 uint nmethods_size = CompileBroker::_sum_nmethod_size;
2696
2697 tty->cr();
2698 tty->print_cr("Accumulated compiler times");
2699 tty->print_cr("----------------------------------------------------------");
2700 //0000000000111111111122222222223333333333444444444455555555556666666666
2701 //0123456789012345678901234567890123456789012345678901234567890123456789
2702 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2703 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2704 standard_compilation.seconds(),
2705 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2706 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2707 CompileBroker::_t_bailedout_compilation.seconds(),
2708 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2709 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2710 osr_compilation.seconds(),
2711 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2712 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2713 CompileBroker::_t_invalidated_compilation.seconds(),
2714 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2715
2716 AbstractCompiler *comp = compiler(CompLevel_simple);
2717 if (comp != nullptr) {
2718 tty->cr();
2719 comp->print_timers();
2720 }
2721 comp = compiler(CompLevel_full_optimization);
2722 if (comp != nullptr) {
2723 tty->cr();
2724 comp->print_timers();
2725 }
2726 #if INCLUDE_JVMCI
2727 if (EnableJVMCI) {
2728 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null());
2729 if (jvmci_comp != nullptr && jvmci_comp != comp) {
2730 tty->cr();
2731 jvmci_comp->print_timers();
2732 }
2733 }
2734 #endif
2735
2736 tty->cr();
2737 tty->print_cr(" Total compiled methods : %8u methods", total_compile_count);
2738 tty->print_cr(" Standard compilation : %8u methods", standard_compile_count);
2739 tty->print_cr(" On stack replacement : %8u methods", osr_compile_count);
2740 uint tcb = osr_bytes_compiled + standard_bytes_compiled;
2741 tty->print_cr(" Total compiled bytecodes : %8u bytes", tcb);
2742 tty->print_cr(" Standard compilation : %8u bytes", standard_bytes_compiled);
2743 tty->print_cr(" On stack replacement : %8u bytes", osr_bytes_compiled);
2744 double tcs = total_compilation.seconds();
2745 uint bps = tcs == 0.0 ? 0 : (uint)(tcb / tcs);
2746 tty->print_cr(" Average compilation speed : %8u bytes/s", bps);
2747 tty->cr();
2748 tty->print_cr(" nmethod code size : %8u bytes", nmethods_code_size);
2749 tty->print_cr(" nmethod total size : %8u bytes", nmethods_size);
2750 }
2751
2752 // Print general/accumulated JIT information.
2753 void CompileBroker::print_info(outputStream *out) {
2754 if (out == nullptr) out = tty;
2755 out->cr();
2756 out->print_cr("======================");
2757 out->print_cr(" General JIT info ");
2758 out->print_cr("======================");
2759 out->cr();
2760 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2761 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2762 out->cr();
2763 out->print_cr("CodeCache overview");
2764 out->print_cr("--------------------------------------------------------");
2765 out->cr();
2766 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2767 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2768 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2769 out->cr();
2770 }
2771
2772 // Note: tty_lock must not be held upon entry to this function.
2773 // Print functions called from herein do "micro-locking" on tty_lock.
2774 // That's a tradeoff which keeps together important blocks of output.
2775 // At the same time, continuous tty_lock hold time is kept in check,
2776 // preventing concurrently printing threads from stalling a long time.
2777 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2778 TimeStamp ts_total;
2779 TimeStamp ts_global;
2780 TimeStamp ts;
2781
2782 bool allFun = !strcmp(function, "all");
2783 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2784 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2785 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2786 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2787 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2788 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2789 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2790 bool discard = !strcmp(function, "discard") || allFun;
2791
2792 if (out == nullptr) {
2793 out = tty;
2794 }
2795
2796 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2797 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2798 out->cr();
2799 return;
2800 }
2801
2802 ts_total.update(); // record starting point
2803
2804 if (aggregate) {
2805 print_info(out);
2806 }
2807
2808 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2809 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2810 // When we request individual parts of the analysis via the jcmd interface, it is possible
2811 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2812 // updated the aggregated data. We will then see a modified, but again consistent, view
2813 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2814 // a lock across user interaction.
2815
2816 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2817 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2818 // leading to an unnecessarily long hold time of the other locks we acquired before.
2819 ts.update(); // record starting point
2820 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2821 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2822
2823 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2824 // Unfortunately, such protection is not sufficient:
2825 // When a new nmethod is created via ciEnv::register_method(), the
2826 // Compile_lock is taken first. After some initializations,
2827 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2828 // immediately (after finalizing the oop references). To lock out concurrent
2829 // modifiers, we have to grab both locks as well in the described sequence.
2830 //
2831 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2832 // for the entire duration of aggregation and printing. That makes sure we see
2833 // a consistent picture and do not run into issues caused by concurrent alterations.
2834 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2835 !Compile_lock->owned_by_self();
2836 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2837 !CodeCache_lock->owned_by_self();
2838 bool take_global_lock_1 = allFun && should_take_Compile_lock;
2839 bool take_global_lock_2 = allFun && should_take_CodeCache_lock;
2840 bool take_function_lock_1 = !allFun && should_take_Compile_lock;
2841 bool take_function_lock_2 = !allFun && should_take_CodeCache_lock;
2842 bool take_global_locks = take_global_lock_1 || take_global_lock_2;
2843 bool take_function_locks = take_function_lock_1 || take_function_lock_2;
2844
2845 ts_global.update(); // record starting point
2846
2847 ConditionalMutexLocker mu1(Compile_lock, take_global_lock_1, Mutex::_safepoint_check_flag);
2848 ConditionalMutexLocker mu2(CodeCache_lock, take_global_lock_2, Mutex::_no_safepoint_check_flag);
2849 if (take_global_locks) {
2850 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2851 ts_global.update(); // record starting point
2852 }
2853
2854 if (aggregate) {
2855 ts.update(); // record starting point
2856 ConditionalMutexLocker mu11(Compile_lock, take_function_lock_1, Mutex::_safepoint_check_flag);
2857 ConditionalMutexLocker mu22(CodeCache_lock, take_function_lock_2, Mutex::_no_safepoint_check_flag);
2858 if (take_function_locks) {
2859 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2860 }
2861
2862 ts.update(); // record starting point
2863 CodeCache::aggregate(out, granularity);
2864 if (take_function_locks) {
2865 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2866 }
2867 }
2868
2869 if (usedSpace) CodeCache::print_usedSpace(out);
2870 if (freeSpace) CodeCache::print_freeSpace(out);
2871 if (methodCount) CodeCache::print_count(out);
2872 if (methodSpace) CodeCache::print_space(out);
2873 if (methodAge) CodeCache::print_age(out);
2874 if (methodNames) {
2875 if (allFun) {
2876 // print_names() can only be used safely if the locks have been continuously held
2877 // since aggregation begin. That is true only for function "all".
2878 CodeCache::print_names(out);
2879 } else {
2880 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2881 }
2882 }
2883 if (discard) CodeCache::discard(out);
2884
2885 if (take_global_locks) {
2886 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2887 }
2888 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2889 }