1 /*
2 * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "classfile/javaClasses.inline.hpp"
26 #include "classfile/symbolTable.hpp"
27 #include "classfile/vmClasses.hpp"
28 #include "classfile/vmSymbols.hpp"
29 #include "code/codeCache.hpp"
30 #include "code/codeHeapState.hpp"
31 #include "code/dependencyContext.hpp"
32 #include "compiler/compilationLog.hpp"
33 #include "compiler/compilationMemoryStatistic.hpp"
34 #include "compiler/compilationPolicy.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerEvent.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "gc/shared/memAllocator.hpp"
41 #include "interpreter/linkResolver.hpp"
42 #include "jfr/jfrEvents.hpp"
43 #include "jvm.h"
44 #include "logging/log.hpp"
45 #include "logging/logStream.hpp"
46 #include "memory/allocation.inline.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/method.inline.hpp"
50 #include "oops/methodData.hpp"
51 #include "oops/oop.inline.hpp"
52 #include "prims/jvmtiExport.hpp"
53 #include "prims/nativeLookup.hpp"
54 #include "prims/whitebox.hpp"
55 #include "runtime/atomic.hpp"
56 #include "runtime/escapeBarrier.hpp"
57 #include "runtime/globals_extension.hpp"
58 #include "runtime/handles.inline.hpp"
59 #include "runtime/init.hpp"
60 #include "runtime/interfaceSupport.inline.hpp"
61 #include "runtime/java.hpp"
62 #include "runtime/javaCalls.hpp"
63 #include "runtime/jniHandles.inline.hpp"
64 #include "runtime/os.hpp"
65 #include "runtime/perfData.hpp"
66 #include "runtime/safepointVerifiers.hpp"
67 #include "runtime/sharedRuntime.hpp"
68 #include "runtime/threads.hpp"
69 #include "runtime/threadSMR.hpp"
70 #include "runtime/timerTrace.hpp"
71 #include "runtime/vframe.inline.hpp"
72 #include "utilities/debug.hpp"
73 #include "utilities/dtrace.hpp"
74 #include "utilities/events.hpp"
75 #include "utilities/formatBuffer.hpp"
76 #include "utilities/macros.hpp"
77 #ifdef COMPILER1
78 #include "c1/c1_Compiler.hpp"
79 #endif
80 #ifdef COMPILER2
81 #include "opto/c2compiler.hpp"
82 #endif
83 #if INCLUDE_JVMCI
84 #include "jvmci/jvmciEnv.hpp"
85 #include "jvmci/jvmciRuntime.hpp"
86 #endif
87
88 #ifdef DTRACE_ENABLED
89
90 // Only bother with this argument setup if dtrace is available
91
92 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
93 { \
94 Symbol* klass_name = (method)->klass_name(); \
95 Symbol* name = (method)->name(); \
96 Symbol* signature = (method)->signature(); \
97 HOTSPOT_METHOD_COMPILE_BEGIN( \
98 (char *) comp_name, strlen(comp_name), \
99 (char *) klass_name->bytes(), klass_name->utf8_length(), \
100 (char *) name->bytes(), name->utf8_length(), \
101 (char *) signature->bytes(), signature->utf8_length()); \
102 }
103
104 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
105 { \
106 Symbol* klass_name = (method)->klass_name(); \
107 Symbol* name = (method)->name(); \
108 Symbol* signature = (method)->signature(); \
109 HOTSPOT_METHOD_COMPILE_END( \
110 (char *) comp_name, strlen(comp_name), \
111 (char *) klass_name->bytes(), klass_name->utf8_length(), \
112 (char *) name->bytes(), name->utf8_length(), \
113 (char *) signature->bytes(), signature->utf8_length(), (success)); \
114 }
115
116 #else // ndef DTRACE_ENABLED
117
118 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
119 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
120
121 #endif // ndef DTRACE_ENABLED
122
123 bool CompileBroker::_initialized = false;
124 volatile bool CompileBroker::_should_block = false;
125 volatile int CompileBroker::_print_compilation_warning = 0;
126 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
127
128 // The installed compiler(s)
129 AbstractCompiler* CompileBroker::_compilers[2];
130
131 // The maximum numbers of compiler threads to be determined during startup.
132 int CompileBroker::_c1_count = 0;
133 int CompileBroker::_c2_count = 0;
134
135 // An array of compiler names as Java String objects
136 jobject* CompileBroker::_compiler1_objects = nullptr;
137 jobject* CompileBroker::_compiler2_objects = nullptr;
138
139 CompileLog** CompileBroker::_compiler1_logs = nullptr;
140 CompileLog** CompileBroker::_compiler2_logs = nullptr;
141
142 // These counters are used to assign an unique ID to each compilation.
143 volatile jint CompileBroker::_compilation_id = 0;
144 volatile jint CompileBroker::_osr_compilation_id = 0;
145 volatile jint CompileBroker::_native_compilation_id = 0;
146
147 // Performance counters
148 PerfCounter* CompileBroker::_perf_total_compilation = nullptr;
149 PerfCounter* CompileBroker::_perf_osr_compilation = nullptr;
150 PerfCounter* CompileBroker::_perf_standard_compilation = nullptr;
151
152 PerfCounter* CompileBroker::_perf_total_bailout_count = nullptr;
153 PerfCounter* CompileBroker::_perf_total_invalidated_count = nullptr;
154 PerfCounter* CompileBroker::_perf_total_compile_count = nullptr;
155 PerfCounter* CompileBroker::_perf_total_osr_compile_count = nullptr;
156 PerfCounter* CompileBroker::_perf_total_standard_compile_count = nullptr;
157
158 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = nullptr;
159 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = nullptr;
160 PerfCounter* CompileBroker::_perf_sum_nmethod_size = nullptr;
161 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = nullptr;
162
163 PerfStringVariable* CompileBroker::_perf_last_method = nullptr;
164 PerfStringVariable* CompileBroker::_perf_last_failed_method = nullptr;
165 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = nullptr;
166 PerfVariable* CompileBroker::_perf_last_compile_type = nullptr;
167 PerfVariable* CompileBroker::_perf_last_compile_size = nullptr;
168 PerfVariable* CompileBroker::_perf_last_failed_type = nullptr;
169 PerfVariable* CompileBroker::_perf_last_invalidated_type = nullptr;
170
171 // Timers and counters for generating statistics
172 elapsedTimer CompileBroker::_t_total_compilation;
173 elapsedTimer CompileBroker::_t_osr_compilation;
174 elapsedTimer CompileBroker::_t_standard_compilation;
175 elapsedTimer CompileBroker::_t_invalidated_compilation;
176 elapsedTimer CompileBroker::_t_bailedout_compilation;
177
178 uint CompileBroker::_total_bailout_count = 0;
179 uint CompileBroker::_total_invalidated_count = 0;
180 uint CompileBroker::_total_compile_count = 0;
181 uint CompileBroker::_total_osr_compile_count = 0;
182 uint CompileBroker::_total_standard_compile_count = 0;
183 uint CompileBroker::_total_compiler_stopped_count = 0;
184 uint CompileBroker::_total_compiler_restarted_count = 0;
185
186 uint CompileBroker::_sum_osr_bytes_compiled = 0;
187 uint CompileBroker::_sum_standard_bytes_compiled = 0;
188 uint CompileBroker::_sum_nmethod_size = 0;
189 uint CompileBroker::_sum_nmethod_code_size = 0;
190
191 jlong CompileBroker::_peak_compilation_time = 0;
192
193 CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization];
194
195 CompileQueue* CompileBroker::_c2_compile_queue = nullptr;
196 CompileQueue* CompileBroker::_c1_compile_queue = nullptr;
197
198 bool compileBroker_init() {
199 if (LogEvents) {
200 CompilationLog::init();
201 }
202
203 // init directives stack, adding default directive
204 DirectivesStack::init();
205
206 if (DirectivesParser::has_file()) {
207 return DirectivesParser::parse_from_flag();
208 } else if (CompilerDirectivesPrint) {
209 // Print default directive even when no other was added
210 DirectivesStack::print(tty);
211 }
212
213 return true;
214 }
215
216 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
217 CompilerThread* thread = CompilerThread::current();
218 thread->set_task(task);
219 CompileLog* log = thread->log();
220 if (log != nullptr && !task->is_unloaded()) task->log_task_start(log);
221 }
222
223 CompileTaskWrapper::~CompileTaskWrapper() {
224 CompilerThread* thread = CompilerThread::current();
225 CompileTask* task = thread->task();
226 CompileLog* log = thread->log();
227 if (log != nullptr && !task->is_unloaded()) task->log_task_done(log);
228 thread->set_task(nullptr);
229 thread->set_env(nullptr);
230 if (task->is_blocking()) {
231 bool free_task = false;
232 {
233 MutexLocker notifier(thread, task->lock());
234 task->mark_complete();
235 #if INCLUDE_JVMCI
236 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
237 if (!task->has_waiter()) {
238 // The waiting thread timed out and thus did not free the task.
239 free_task = true;
240 }
241 task->set_blocking_jvmci_compile_state(nullptr);
242 }
243 #endif
244 if (!free_task) {
245 // Notify the waiting thread that the compilation has completed
246 // so that it can free the task.
247 task->lock()->notify_all();
248 }
249 }
250 if (free_task) {
251 // The task can only be freed once the task lock is released.
252 CompileTask::free(task);
253 }
254 } else {
255 task->mark_complete();
256
257 // By convention, the compiling thread is responsible for
258 // recycling a non-blocking CompileTask.
259 CompileTask::free(task);
260 }
261 }
262
263 /**
264 * Check if a CompilerThread can be removed and update count if requested.
265 */
266 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
267 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
268 if (!ReduceNumberOfCompilerThreads) return false;
269
270 AbstractCompiler *compiler = ct->compiler();
271 int compiler_count = compiler->num_compiler_threads();
272 bool c1 = compiler->is_c1();
273
274 // Keep at least 1 compiler thread of each type.
275 if (compiler_count < 2) return false;
276
277 // Keep thread alive for at least some time.
278 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
279
280 #if INCLUDE_JVMCI
281 if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
282 // Handles for JVMCI thread objects may get released concurrently.
283 if (do_it) {
284 assert(CompileThread_lock->owner() == ct, "must be holding lock");
285 } else {
286 // Skip check if it's the last thread and let caller check again.
287 return true;
288 }
289 }
290 #endif
291
292 // We only allow the last compiler thread of each type to get removed.
293 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
294 : compiler2_object(compiler_count - 1);
295 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
296 if (do_it) {
297 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
298 compiler->set_num_compiler_threads(compiler_count - 1);
299 #if INCLUDE_JVMCI
300 if (compiler->is_jvmci() && !UseJVMCINativeLibrary) {
301 // Old j.l.Thread object can die when no longer referenced elsewhere.
302 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
303 _compiler2_objects[compiler_count - 1] = nullptr;
304 }
305 #endif
306 }
307 return true;
308 }
309 return false;
310 }
311
312 /**
313 * Add a CompileTask to a CompileQueue.
314 */
315 void CompileQueue::add(CompileTask* task) {
316 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
317
318 task->set_next(nullptr);
319 task->set_prev(nullptr);
320
321 if (_last == nullptr) {
322 // The compile queue is empty.
323 assert(_first == nullptr, "queue is empty");
324 _first = task;
325 _last = task;
326 } else {
327 // Append the task to the queue.
328 assert(_last->next() == nullptr, "not last");
329 _last->set_next(task);
330 task->set_prev(_last);
331 _last = task;
332 }
333 ++_size;
334 ++_total_added;
335 if (_size > _peak_size) {
336 _peak_size = _size;
337 }
338
339 // Mark the method as being in the compile queue.
340 task->method()->set_queued_for_compilation();
341
342 if (CIPrintCompileQueue) {
343 print_tty();
344 }
345
346 if (LogCompilation && xtty != nullptr) {
347 task->log_task_queued();
348 }
349
350 // Notify CompilerThreads that a task is available.
351 MethodCompileQueue_lock->notify_all();
352 }
353
354 /**
355 * Empties compilation queue by putting all compilation tasks onto
356 * a freelist. Furthermore, the method wakes up all threads that are
357 * waiting on a compilation task to finish. This can happen if background
358 * compilation is disabled.
359 */
360 void CompileQueue::free_all() {
361 MutexLocker mu(MethodCompileQueue_lock);
362 CompileTask* next = _first;
363
364 // Iterate over all tasks in the compile queue
365 while (next != nullptr) {
366 CompileTask* current = next;
367 next = current->next();
368 bool found_waiter = false;
369 {
370 MutexLocker ct_lock(current->lock());
371 assert(current->waiting_for_completion_count() <= 1, "more than one thread are waiting for task");
372 if (current->waiting_for_completion_count() > 0) {
373 // If another thread waits for this task, we must wake them up
374 // so they will stop waiting and free the task.
375 current->lock()->notify();
376 found_waiter = true;
377 }
378 }
379 if (!found_waiter) {
380 // If no one was waiting for this task, we need to free it ourselves. In this case, the task
381 // is also certainly unlocked, because, again, there is no waiter.
382 // Otherwise, by convention, it's the waiters responsibility to free the task.
383 // Put the task back on the freelist.
384 CompileTask::free(current);
385 }
386 }
387 _first = nullptr;
388 _last = nullptr;
389
390 // Wake up all threads that block on the queue.
391 MethodCompileQueue_lock->notify_all();
392 }
393
394 /**
395 * Get the next CompileTask from a CompileQueue
396 */
397 CompileTask* CompileQueue::get(CompilerThread* thread) {
398 // save methods from RedefineClasses across safepoint
399 // across MethodCompileQueue_lock below.
400 methodHandle save_method;
401 methodHandle save_hot_method;
402
403 MonitorLocker locker(MethodCompileQueue_lock);
404 // If _first is null we have no more compile jobs. There are two reasons for
405 // having no compile jobs: First, we compiled everything we wanted. Second,
406 // we ran out of code cache so compilation has been disabled. In the latter
407 // case we perform code cache sweeps to free memory such that we can re-enable
408 // compilation.
409 while (_first == nullptr) {
410 // Exit loop if compilation is disabled forever
411 if (CompileBroker::is_compilation_disabled_forever()) {
412 return nullptr;
413 }
414
415 AbstractCompiler* compiler = thread->compiler();
416 guarantee(compiler != nullptr, "Compiler object must exist");
417 compiler->on_empty_queue(this, thread);
418 if (_first != nullptr) {
419 // The call to on_empty_queue may have temporarily unlocked the MCQ lock
420 // so check again whether any tasks were added to the queue.
421 break;
422 }
423
424 // If there are no compilation tasks and we can compile new jobs
425 // (i.e., there is enough free space in the code cache) there is
426 // no need to invoke the GC.
427 // We need a timed wait here, since compiler threads can exit if compilation
428 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
429 // is not critical and we do not want idle compiler threads to wake up too often.
430 locker.wait(5*1000);
431
432 if (UseDynamicNumberOfCompilerThreads && _first == nullptr) {
433 // Still nothing to compile. Give caller a chance to stop this thread.
434 if (CompileBroker::can_remove(CompilerThread::current(), false)) return nullptr;
435 }
436 }
437
438 if (CompileBroker::is_compilation_disabled_forever()) {
439 return nullptr;
440 }
441
442 CompileTask* task;
443 {
444 NoSafepointVerifier nsv;
445 task = CompilationPolicy::select_task(this);
446 if (task != nullptr) {
447 task = task->select_for_compilation();
448 }
449 }
450
451 if (task != nullptr) {
452 // Save method pointers across unlock safepoint. The task is removed from
453 // the compilation queue, which is walked during RedefineClasses.
454 Thread* thread = Thread::current();
455 save_method = methodHandle(thread, task->method());
456 save_hot_method = methodHandle(thread, task->hot_method());
457
458 remove(task);
459 }
460 purge_stale_tasks(); // may temporarily release MCQ lock
461 return task;
462 }
463
464 // Clean & deallocate stale compile tasks.
465 // Temporarily releases MethodCompileQueue lock.
466 void CompileQueue::purge_stale_tasks() {
467 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
468 if (_first_stale != nullptr) {
469 // Stale tasks are purged when MCQ lock is released,
470 // but _first_stale updates are protected by MCQ lock.
471 // Once task processing starts and MCQ lock is released,
472 // other compiler threads can reuse _first_stale.
473 CompileTask* head = _first_stale;
474 _first_stale = nullptr;
475 {
476 MutexUnlocker ul(MethodCompileQueue_lock);
477 for (CompileTask* task = head; task != nullptr; ) {
478 CompileTask* next_task = task->next();
479 CompileTaskWrapper ctw(task); // Frees the task
480 task->set_failure_reason("stale task");
481 task = next_task;
482 }
483 }
484 }
485 }
486
487 void CompileQueue::remove(CompileTask* task) {
488 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
489 if (task->prev() != nullptr) {
490 task->prev()->set_next(task->next());
491 } else {
492 // max is the first element
493 assert(task == _first, "Sanity");
494 _first = task->next();
495 }
496
497 if (task->next() != nullptr) {
498 task->next()->set_prev(task->prev());
499 } else {
500 // max is the last element
501 assert(task == _last, "Sanity");
502 _last = task->prev();
503 }
504 --_size;
505 ++_total_removed;
506 }
507
508 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
509 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
510 remove(task);
511
512 // Enqueue the task for reclamation (should be done outside MCQ lock)
513 task->set_next(_first_stale);
514 task->set_prev(nullptr);
515 _first_stale = task;
516 }
517
518 // methods in the compile queue need to be marked as used on the stack
519 // so that they don't get reclaimed by Redefine Classes
520 void CompileQueue::mark_on_stack() {
521 CompileTask* task = _first;
522 while (task != nullptr) {
523 task->mark_on_stack();
524 task = task->next();
525 }
526 }
527
528
529 CompileQueue* CompileBroker::compile_queue(int comp_level) {
530 if (is_c2_compile(comp_level)) return _c2_compile_queue;
531 if (is_c1_compile(comp_level)) return _c1_compile_queue;
532 return nullptr;
533 }
534
535 CompileQueue* CompileBroker::c1_compile_queue() {
536 return _c1_compile_queue;
537 }
538
539 CompileQueue* CompileBroker::c2_compile_queue() {
540 return _c2_compile_queue;
541 }
542
543 void CompileBroker::print_compile_queues(outputStream* st) {
544 st->print_cr("Current compiles: ");
545
546 char buf[2000];
547 int buflen = sizeof(buf);
548 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
549
550 st->cr();
551 if (_c1_compile_queue != nullptr) {
552 _c1_compile_queue->print(st);
553 }
554 if (_c2_compile_queue != nullptr) {
555 _c2_compile_queue->print(st);
556 }
557 }
558
559 void CompileQueue::print(outputStream* st) {
560 assert_locked_or_safepoint(MethodCompileQueue_lock);
561 st->print_cr("%s:", name());
562 CompileTask* task = _first;
563 if (task == nullptr) {
564 st->print_cr("Empty");
565 } else {
566 while (task != nullptr) {
567 task->print(st, nullptr, true, true);
568 task = task->next();
569 }
570 }
571 st->cr();
572 }
573
574 void CompileQueue::print_tty() {
575 stringStream ss;
576 // Dump the compile queue into a buffer before locking the tty
577 print(&ss);
578 {
579 ttyLocker ttyl;
580 tty->print("%s", ss.freeze());
581 }
582 }
583
584 CompilerCounters::CompilerCounters() {
585 _current_method[0] = '\0';
586 _compile_type = CompileBroker::no_compile;
587 }
588
589 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
590 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
591 // in compiler/compilerEvent.cpp) and registers it with its serializer.
592 //
593 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
594 // so if c2 is used, it should be always registered first.
595 // This function is called during vm initialization.
596 static void register_jfr_phasetype_serializer(CompilerType compiler_type) {
597 ResourceMark rm;
598 static bool first_registration = true;
599 if (compiler_type == compiler_jvmci) {
600 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
601 first_registration = false;
602 #ifdef COMPILER2
603 } else if (compiler_type == compiler_c2) {
604 assert(first_registration, "invariant"); // c2 must be registered first.
605 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
606 const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i);
607 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
608 }
609 first_registration = false;
610 #endif // COMPILER2
611 }
612 }
613 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
614
615 // ------------------------------------------------------------------
616 // CompileBroker::compilation_init
617 //
618 // Initialize the Compilation object
619 void CompileBroker::compilation_init(JavaThread* THREAD) {
620 // No need to initialize compilation system if we do not use it.
621 if (!UseCompiler) {
622 return;
623 }
624 // Set the interface to the current compiler(s).
625 _c1_count = CompilationPolicy::c1_count();
626 _c2_count = CompilationPolicy::c2_count();
627
628 #if INCLUDE_JVMCI
629 if (EnableJVMCI) {
630 // This is creating a JVMCICompiler singleton.
631 JVMCICompiler* jvmci = new JVMCICompiler();
632
633 if (UseJVMCICompiler) {
634 _compilers[1] = jvmci;
635 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
636 if (BootstrapJVMCI) {
637 // JVMCI will bootstrap so give it more threads
638 _c2_count = MIN2(32, os::active_processor_count());
639 }
640 } else {
641 _c2_count = JVMCIThreads;
642 }
643 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
644 } else {
645 #ifdef COMPILER1
646 _c1_count = JVMCIHostThreads;
647 #endif // COMPILER1
648 }
649 }
650 }
651 #endif // INCLUDE_JVMCI
652
653 #ifdef COMPILER1
654 if (_c1_count > 0) {
655 _compilers[0] = new Compiler();
656 }
657 #endif // COMPILER1
658
659 #ifdef COMPILER2
660 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
661 if (_c2_count > 0) {
662 _compilers[1] = new C2Compiler();
663 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
664 // idToPhase mapping for c2 is in opto/phasetype.hpp
665 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
666 }
667 }
668 #endif // COMPILER2
669
670 #if INCLUDE_JVMCI
671 // Register after c2 registration.
672 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
673 if (EnableJVMCI) {
674 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
675 }
676 #endif // INCLUDE_JVMCI
677
678 if (CompilerOracle::should_collect_memstat()) {
679 CompilationMemoryStatistic::initialize();
680 }
681
682 // Start the compiler thread(s)
683 init_compiler_threads();
684 // totalTime performance counter is always created as it is required
685 // by the implementation of java.lang.management.CompilationMXBean.
686 {
687 // Ensure OOM leads to vm_exit_during_initialization.
688 EXCEPTION_MARK;
689 _perf_total_compilation =
690 PerfDataManager::create_counter(JAVA_CI, "totalTime",
691 PerfData::U_Ticks, CHECK);
692 }
693
694 if (UsePerfData) {
695
696 EXCEPTION_MARK;
697
698 // create the jvmstat performance counters
699 _perf_osr_compilation =
700 PerfDataManager::create_counter(SUN_CI, "osrTime",
701 PerfData::U_Ticks, CHECK);
702
703 _perf_standard_compilation =
704 PerfDataManager::create_counter(SUN_CI, "standardTime",
705 PerfData::U_Ticks, CHECK);
706
707 _perf_total_bailout_count =
708 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
709 PerfData::U_Events, CHECK);
710
711 _perf_total_invalidated_count =
712 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
713 PerfData::U_Events, CHECK);
714
715 _perf_total_compile_count =
716 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
717 PerfData::U_Events, CHECK);
718 _perf_total_osr_compile_count =
719 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
720 PerfData::U_Events, CHECK);
721
722 _perf_total_standard_compile_count =
723 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
724 PerfData::U_Events, CHECK);
725
726 _perf_sum_osr_bytes_compiled =
727 PerfDataManager::create_counter(SUN_CI, "osrBytes",
728 PerfData::U_Bytes, CHECK);
729
730 _perf_sum_standard_bytes_compiled =
731 PerfDataManager::create_counter(SUN_CI, "standardBytes",
732 PerfData::U_Bytes, CHECK);
733
734 _perf_sum_nmethod_size =
735 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
736 PerfData::U_Bytes, CHECK);
737
738 _perf_sum_nmethod_code_size =
739 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
740 PerfData::U_Bytes, CHECK);
741
742 _perf_last_method =
743 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
744 CompilerCounters::cmname_buffer_length,
745 "", CHECK);
746
747 _perf_last_failed_method =
748 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
749 CompilerCounters::cmname_buffer_length,
750 "", CHECK);
751
752 _perf_last_invalidated_method =
753 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
754 CompilerCounters::cmname_buffer_length,
755 "", CHECK);
756
757 _perf_last_compile_type =
758 PerfDataManager::create_variable(SUN_CI, "lastType",
759 PerfData::U_None,
760 (jlong)CompileBroker::no_compile,
761 CHECK);
762
763 _perf_last_compile_size =
764 PerfDataManager::create_variable(SUN_CI, "lastSize",
765 PerfData::U_Bytes,
766 (jlong)CompileBroker::no_compile,
767 CHECK);
768
769
770 _perf_last_failed_type =
771 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
772 PerfData::U_None,
773 (jlong)CompileBroker::no_compile,
774 CHECK);
775
776 _perf_last_invalidated_type =
777 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
778 PerfData::U_None,
779 (jlong)CompileBroker::no_compile,
780 CHECK);
781 }
782
783 _initialized = true;
784 }
785
786 #if defined(ASSERT) && COMPILER2_OR_JVMCI
787 // Entry for DeoptimizeObjectsALotThread. The threads are started in
788 // CompileBroker::init_compiler_threads() iff DeoptimizeObjectsALot is enabled
789 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
790 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
791 bool enter_single_loop;
792 {
793 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
794 static int single_thread_count = 0;
795 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
796 }
797 if (enter_single_loop) {
798 dt->deoptimize_objects_alot_loop_single();
799 } else {
800 dt->deoptimize_objects_alot_loop_all();
801 }
802 }
803
804 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
805 // barrier targets a single thread which is selected round robin.
806 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
807 HandleMark hm(this);
808 while (true) {
809 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
810 { // Begin new scope for escape barrier
811 HandleMarkCleaner hmc(this);
812 ResourceMark rm(this);
813 EscapeBarrier eb(true, this, deoptee_thread);
814 eb.deoptimize_objects(100);
815 }
816 // Now sleep after the escape barriers destructor resumed deoptee_thread.
817 sleep(DeoptimizeObjectsALotInterval);
818 }
819 }
820 }
821
822 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
823 // barrier targets all java threads in the vm at once.
824 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
825 HandleMark hm(this);
826 while (true) {
827 { // Begin new scope for escape barrier
828 HandleMarkCleaner hmc(this);
829 ResourceMark rm(this);
830 EscapeBarrier eb(true, this);
831 eb.deoptimize_objects_all_threads();
832 }
833 // Now sleep after the escape barriers destructor resumed the java threads.
834 sleep(DeoptimizeObjectsALotInterval);
835 }
836 }
837 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
838
839
840 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
841 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
842
843 if (java_lang_Thread::thread(thread_oop()) != nullptr) {
844 assert(type == compiler_t, "should only happen with reused compiler threads");
845 // The compiler thread hasn't actually exited yet so don't try to reuse it
846 return nullptr;
847 }
848
849 JavaThread* new_thread = nullptr;
850 switch (type) {
851 case compiler_t:
852 assert(comp != nullptr, "Compiler instance missing.");
853 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
854 CompilerCounters* counters = new CompilerCounters();
855 new_thread = new CompilerThread(queue, counters);
856 }
857 break;
858 #if defined(ASSERT) && COMPILER2_OR_JVMCI
859 case deoptimizer_t:
860 new_thread = new DeoptimizeObjectsALotThread();
861 break;
862 #endif // ASSERT
863 default:
864 ShouldNotReachHere();
865 }
866
867 // At this point the new CompilerThread data-races with this startup
868 // thread (which is the main thread and NOT the VM thread).
869 // This means Java bytecodes being executed at startup can
870 // queue compile jobs which will run at whatever default priority the
871 // newly created CompilerThread runs at.
872
873
874 // At this point it may be possible that no osthread was created for the
875 // JavaThread due to lack of resources. We will handle that failure below.
876 // Also check new_thread so that static analysis is happy.
877 if (new_thread != nullptr && new_thread->osthread() != nullptr) {
878
879 if (type == compiler_t) {
880 CompilerThread::cast(new_thread)->set_compiler(comp);
881 }
882
883 // Note that we cannot call os::set_priority because it expects Java
884 // priorities and we are *explicitly* using OS priorities so that it's
885 // possible to set the compiler thread priority higher than any Java
886 // thread.
887
888 int native_prio = CompilerThreadPriority;
889 if (native_prio == -1) {
890 if (UseCriticalCompilerThreadPriority) {
891 native_prio = os::java_to_os_priority[CriticalPriority];
892 } else {
893 native_prio = os::java_to_os_priority[NearMaxPriority];
894 }
895 }
896 os::set_native_priority(new_thread, native_prio);
897
898 // Note that this only sets the JavaThread _priority field, which by
899 // definition is limited to Java priorities and not OS priorities.
900 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
901
902 } else { // osthread initialization failure
903 if (UseDynamicNumberOfCompilerThreads && type == compiler_t
904 && comp->num_compiler_threads() > 0) {
905 // The new thread is not known to Thread-SMR yet so we can just delete.
906 delete new_thread;
907 return nullptr;
908 } else {
909 vm_exit_during_initialization("java.lang.OutOfMemoryError",
910 os::native_thread_creation_failed_msg());
911 }
912 }
913
914 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
915
916 return new_thread;
917 }
918
919 static bool trace_compiler_threads() {
920 LogTarget(Debug, jit, thread) lt;
921 return TraceCompilerThreads || lt.is_enabled();
922 }
923
924 static jobject create_compiler_thread(AbstractCompiler* compiler, int i, TRAPS) {
925 char name_buffer[256];
926 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", compiler->name(), i);
927 Handle thread_oop = JavaThread::create_system_thread_object(name_buffer, CHECK_NULL);
928 return JNIHandles::make_global(thread_oop);
929 }
930
931 static void print_compiler_threads(stringStream& msg) {
932 if (TraceCompilerThreads) {
933 tty->print_cr("%7d %s", (int)tty->time_stamp().milliseconds(), msg.as_string());
934 }
935 LogTarget(Debug, jit, thread) lt;
936 if (lt.is_enabled()) {
937 LogStream ls(lt);
938 ls.print_cr("%s", msg.as_string());
939 }
940 }
941
942 void CompileBroker::init_compiler_threads() {
943 // Ensure any exceptions lead to vm_exit_during_initialization.
944 EXCEPTION_MARK;
945 #if !defined(ZERO)
946 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
947 #endif // !ZERO
948 // Initialize the compilation queue
949 if (_c2_count > 0) {
950 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
951 _c2_compile_queue = new CompileQueue(name);
952 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
953 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
954 }
955 if (_c1_count > 0) {
956 _c1_compile_queue = new CompileQueue("C1 compile queue");
957 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
958 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
959 }
960
961 for (int i = 0; i < _c2_count; i++) {
962 // Create a name for our thread.
963 jobject thread_handle = create_compiler_thread(_compilers[1], i, CHECK);
964 _compiler2_objects[i] = thread_handle;
965 _compiler2_logs[i] = nullptr;
966
967 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
968 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
969 assert(ct != nullptr, "should have been handled for initial thread");
970 _compilers[1]->set_num_compiler_threads(i + 1);
971 if (trace_compiler_threads()) {
972 ResourceMark rm;
973 ThreadsListHandle tlh; // name() depends on the TLH.
974 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
975 stringStream msg;
976 msg.print("Added initial compiler thread %s", ct->name());
977 print_compiler_threads(msg);
978 }
979 }
980 }
981
982 for (int i = 0; i < _c1_count; i++) {
983 // Create a name for our thread.
984 jobject thread_handle = create_compiler_thread(_compilers[0], i, CHECK);
985 _compiler1_objects[i] = thread_handle;
986 _compiler1_logs[i] = nullptr;
987
988 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
989 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
990 assert(ct != nullptr, "should have been handled for initial thread");
991 _compilers[0]->set_num_compiler_threads(i + 1);
992 if (trace_compiler_threads()) {
993 ResourceMark rm;
994 ThreadsListHandle tlh; // name() depends on the TLH.
995 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
996 stringStream msg;
997 msg.print("Added initial compiler thread %s", ct->name());
998 print_compiler_threads(msg);
999 }
1000 }
1001 }
1002
1003 if (UsePerfData) {
1004 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
1005 }
1006
1007 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1008 if (DeoptimizeObjectsALot) {
1009 // Initialize and start the object deoptimizer threads
1010 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1011 for (int count = 0; count < total_count; count++) {
1012 Handle thread_oop = JavaThread::create_system_thread_object("Deoptimize objects a lot single mode", CHECK);
1013 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1014 make_thread(deoptimizer_t, thread_handle, nullptr, nullptr, THREAD);
1015 }
1016 }
1017 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1018 }
1019
1020 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
1021
1022 int old_c2_count = 0, new_c2_count = 0, old_c1_count = 0, new_c1_count = 0;
1023 const int c2_tasks_per_thread = 2, c1_tasks_per_thread = 4;
1024
1025 // Quick check if we already have enough compiler threads without taking the lock.
1026 // Numbers may change concurrently, so we read them again after we have the lock.
1027 if (_c2_compile_queue != nullptr) {
1028 old_c2_count = get_c2_thread_count();
1029 new_c2_count = MIN2(_c2_count, _c2_compile_queue->size() / c2_tasks_per_thread);
1030 }
1031 if (_c1_compile_queue != nullptr) {
1032 old_c1_count = get_c1_thread_count();
1033 new_c1_count = MIN2(_c1_count, _c1_compile_queue->size() / c1_tasks_per_thread);
1034 }
1035 if (new_c2_count <= old_c2_count && new_c1_count <= old_c1_count) return;
1036
1037 // Now, we do the more expensive operations.
1038 julong free_memory = os::free_memory();
1039 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1040 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1041 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1042
1043 // Only attempt to start additional threads if the lock is free.
1044 if (!CompileThread_lock->try_lock()) return;
1045
1046 if (_c2_compile_queue != nullptr) {
1047 old_c2_count = get_c2_thread_count();
1048 new_c2_count = MIN4(_c2_count,
1049 _c2_compile_queue->size() / c2_tasks_per_thread,
1050 (int)(free_memory / (200*M)),
1051 (int)(available_cc_np / (128*K)));
1052
1053 for (int i = old_c2_count; i < new_c2_count; i++) {
1054 #if INCLUDE_JVMCI
1055 if (UseJVMCICompiler && !UseJVMCINativeLibrary && _compiler2_objects[i] == nullptr) {
1056 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread objects as their
1057 // existence is completely hidden from the rest of the VM (and those compiler threads can't
1058 // call Java code to do the creation anyway).
1059 //
1060 // For pure Java JVMCI we have to create new j.l.Thread objects as they are visible and we
1061 // can see unexpected thread lifecycle transitions if we bind them to new JavaThreads. For
1062 // native library JVMCI it's preferred to use the C1/C2 strategy as this avoids unnecessary
1063 // coupling with Java.
1064 if (!THREAD->can_call_java()) break;
1065 char name_buffer[256];
1066 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i);
1067 Handle thread_oop;
1068 {
1069 // We have to give up the lock temporarily for the Java calls.
1070 MutexUnlocker mu(CompileThread_lock);
1071 thread_oop = JavaThread::create_system_thread_object(name_buffer, THREAD);
1072 }
1073 if (HAS_PENDING_EXCEPTION) {
1074 if (trace_compiler_threads()) {
1075 ResourceMark rm;
1076 stringStream msg;
1077 msg.print_cr("JVMCI compiler thread creation failed:");
1078 PENDING_EXCEPTION->print_on(&msg);
1079 print_compiler_threads(msg);
1080 }
1081 CLEAR_PENDING_EXCEPTION;
1082 break;
1083 }
1084 // Check if another thread has beaten us during the Java calls.
1085 if (get_c2_thread_count() != i) break;
1086 jobject thread_handle = JNIHandles::make_global(thread_oop);
1087 assert(compiler2_object(i) == nullptr, "Old one must be released!");
1088 _compiler2_objects[i] = thread_handle;
1089 }
1090 #endif
1091 guarantee(compiler2_object(i) != nullptr, "Thread oop must exist");
1092 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1093 if (ct == nullptr) break;
1094 _compilers[1]->set_num_compiler_threads(i + 1);
1095 if (trace_compiler_threads()) {
1096 ResourceMark rm;
1097 ThreadsListHandle tlh; // name() depends on the TLH.
1098 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1099 stringStream msg;
1100 msg.print("Added compiler thread %s (free memory: %dMB, available non-profiled code cache: %dMB)",
1101 ct->name(), (int)(free_memory/M), (int)(available_cc_np/M));
1102 print_compiler_threads(msg);
1103 }
1104 }
1105 }
1106
1107 if (_c1_compile_queue != nullptr) {
1108 old_c1_count = get_c1_thread_count();
1109 new_c1_count = MIN4(_c1_count,
1110 _c1_compile_queue->size() / c1_tasks_per_thread,
1111 (int)(free_memory / (100*M)),
1112 (int)(available_cc_p / (128*K)));
1113
1114 for (int i = old_c1_count; i < new_c1_count; i++) {
1115 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1116 if (ct == nullptr) break;
1117 _compilers[0]->set_num_compiler_threads(i + 1);
1118 if (trace_compiler_threads()) {
1119 ResourceMark rm;
1120 ThreadsListHandle tlh; // name() depends on the TLH.
1121 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1122 stringStream msg;
1123 msg.print("Added compiler thread %s (free memory: %dMB, available profiled code cache: %dMB)",
1124 ct->name(), (int)(free_memory/M), (int)(available_cc_p/M));
1125 print_compiler_threads(msg);
1126 }
1127 }
1128 }
1129
1130 CompileThread_lock->unlock();
1131 }
1132
1133
1134 /**
1135 * Set the methods on the stack as on_stack so that redefine classes doesn't
1136 * reclaim them. This method is executed at a safepoint.
1137 */
1138 void CompileBroker::mark_on_stack() {
1139 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1140 // Since we are at a safepoint, we do not need a lock to access
1141 // the compile queues.
1142 if (_c2_compile_queue != nullptr) {
1143 _c2_compile_queue->mark_on_stack();
1144 }
1145 if (_c1_compile_queue != nullptr) {
1146 _c1_compile_queue->mark_on_stack();
1147 }
1148 }
1149
1150 // ------------------------------------------------------------------
1151 // CompileBroker::compile_method
1152 //
1153 // Request compilation of a method.
1154 void CompileBroker::compile_method_base(const methodHandle& method,
1155 int osr_bci,
1156 int comp_level,
1157 const methodHandle& hot_method,
1158 int hot_count,
1159 CompileTask::CompileReason compile_reason,
1160 bool blocking,
1161 Thread* thread) {
1162 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1163 assert(method->method_holder()->is_instance_klass(),
1164 "sanity check");
1165 assert(!method->method_holder()->is_not_initialized(),
1166 "method holder must be initialized");
1167 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1168
1169 if (CIPrintRequests) {
1170 tty->print("request: ");
1171 method->print_short_name(tty);
1172 if (osr_bci != InvocationEntryBci) {
1173 tty->print(" osr_bci: %d", osr_bci);
1174 }
1175 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1176 if (!hot_method.is_null()) {
1177 tty->print(" hot: ");
1178 if (hot_method() != method()) {
1179 hot_method->print_short_name(tty);
1180 } else {
1181 tty->print("yes");
1182 }
1183 }
1184 tty->cr();
1185 }
1186
1187 // A request has been made for compilation. Before we do any
1188 // real work, check to see if the method has been compiled
1189 // in the meantime with a definitive result.
1190 if (compilation_is_complete(method, osr_bci, comp_level)) {
1191 return;
1192 }
1193
1194 #ifndef PRODUCT
1195 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1196 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1197 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1198 return;
1199 }
1200 }
1201 #endif
1202
1203 // If this method is already in the compile queue, then
1204 // we do not block the current thread.
1205 if (compilation_is_in_queue(method)) {
1206 // We may want to decay our counter a bit here to prevent
1207 // multiple denied requests for compilation. This is an
1208 // open compilation policy issue. Note: The other possibility,
1209 // in the case that this is a blocking compile request, is to have
1210 // all subsequent blocking requesters wait for completion of
1211 // ongoing compiles. Note that in this case we'll need a protocol
1212 // for freeing the associated compile tasks. [Or we could have
1213 // a single static monitor on which all these waiters sleep.]
1214 return;
1215 }
1216
1217 // Tiered policy requires MethodCounters to exist before adding a method to
1218 // the queue. Create if we don't have them yet.
1219 method->get_method_counters(thread);
1220
1221 // Outputs from the following MutexLocker block:
1222 CompileTask* task = nullptr;
1223 CompileQueue* queue = compile_queue(comp_level);
1224
1225 // Acquire our lock.
1226 {
1227 MutexLocker locker(thread, MethodCompileQueue_lock);
1228
1229 // Make sure the method has not slipped into the queues since
1230 // last we checked; note that those checks were "fast bail-outs".
1231 // Here we need to be more careful, see 14012000 below.
1232 if (compilation_is_in_queue(method)) {
1233 return;
1234 }
1235
1236 // We need to check again to see if the compilation has
1237 // completed. A previous compilation may have registered
1238 // some result.
1239 if (compilation_is_complete(method, osr_bci, comp_level)) {
1240 return;
1241 }
1242
1243 // We now know that this compilation is not pending, complete,
1244 // or prohibited. Assign a compile_id to this compilation
1245 // and check to see if it is in our [Start..Stop) range.
1246 int compile_id = assign_compile_id(method, osr_bci);
1247 if (compile_id == 0) {
1248 // The compilation falls outside the allowed range.
1249 return;
1250 }
1251
1252 #if INCLUDE_JVMCI
1253 if (UseJVMCICompiler && blocking) {
1254 // Don't allow blocking compiles for requests triggered by JVMCI.
1255 if (thread->is_Compiler_thread()) {
1256 blocking = false;
1257 }
1258
1259 // In libjvmci, JVMCI initialization should not deadlock with other threads
1260 if (!UseJVMCINativeLibrary) {
1261 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1262 vframeStream vfst(JavaThread::cast(thread));
1263 for (; !vfst.at_end(); vfst.next()) {
1264 if (vfst.method()->is_class_initializer() ||
1265 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1266 vfst.method()->name() == vmSymbols::loadClass_name())) {
1267 blocking = false;
1268 break;
1269 }
1270 }
1271
1272 // Don't allow blocking compilation requests to JVMCI
1273 // if JVMCI itself is not yet initialized
1274 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1275 blocking = false;
1276 }
1277 }
1278
1279 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1280 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1281 // such as the DestroyJavaVM thread.
1282 if (JVMCI::in_shutdown()) {
1283 blocking = false;
1284 }
1285 }
1286 #endif // INCLUDE_JVMCI
1287
1288 // We will enter the compilation in the queue.
1289 // 14012000: Note that this sets the queued_for_compile bits in
1290 // the target method. We can now reason that a method cannot be
1291 // queued for compilation more than once, as follows:
1292 // Before a thread queues a task for compilation, it first acquires
1293 // the compile queue lock, then checks if the method's queued bits
1294 // are set or it has already been compiled. Thus there can not be two
1295 // instances of a compilation task for the same method on the
1296 // compilation queue. Consider now the case where the compilation
1297 // thread has already removed a task for that method from the queue
1298 // and is in the midst of compiling it. In this case, the
1299 // queued_for_compile bits must be set in the method (and these
1300 // will be visible to the current thread, since the bits were set
1301 // under protection of the compile queue lock, which we hold now.
1302 // When the compilation completes, the compiler thread first sets
1303 // the compilation result and then clears the queued_for_compile
1304 // bits. Neither of these actions are protected by a barrier (or done
1305 // under the protection of a lock), so the only guarantee we have
1306 // (on machines with TSO (Total Store Order)) is that these values
1307 // will update in that order. As a result, the only combinations of
1308 // these bits that the current thread will see are, in temporal order:
1309 // <RESULT, QUEUE> :
1310 // <0, 1> : in compile queue, but not yet compiled
1311 // <1, 1> : compiled but queue bit not cleared
1312 // <1, 0> : compiled and queue bit cleared
1313 // Because we first check the queue bits then check the result bits,
1314 // we are assured that we cannot introduce a duplicate task.
1315 // Note that if we did the tests in the reverse order (i.e. check
1316 // result then check queued bit), we could get the result bit before
1317 // the compilation completed, and the queue bit after the compilation
1318 // completed, and end up introducing a "duplicate" (redundant) task.
1319 // In that case, the compiler thread should first check if a method
1320 // has already been compiled before trying to compile it.
1321 // NOTE: in the event that there are multiple compiler threads and
1322 // there is de-optimization/recompilation, things will get hairy,
1323 // and in that case it's best to protect both the testing (here) of
1324 // these bits, and their updating (here and elsewhere) under a
1325 // common lock.
1326 task = create_compile_task(queue,
1327 compile_id, method,
1328 osr_bci, comp_level,
1329 hot_method, hot_count, compile_reason,
1330 blocking);
1331 }
1332
1333 if (blocking) {
1334 wait_for_completion(task);
1335 }
1336 }
1337
1338 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1339 int comp_level,
1340 const methodHandle& hot_method, int hot_count,
1341 CompileTask::CompileReason compile_reason,
1342 TRAPS) {
1343 // Do nothing if compilebroker is not initialized or compiles are submitted on level none
1344 if (!_initialized || comp_level == CompLevel_none) {
1345 return nullptr;
1346 }
1347
1348 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1349 assert(comp != nullptr, "Ensure we have a compiler");
1350
1351 #if INCLUDE_JVMCI
1352 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1353 // JVMCI compilation is not yet initializable.
1354 return nullptr;
1355 }
1356 #endif
1357
1358 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1359 // CompileBroker::compile_method can trap and can have pending async exception.
1360 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1361 DirectivesStack::release(directive);
1362 return nm;
1363 }
1364
1365 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1366 int comp_level,
1367 const methodHandle& hot_method, int hot_count,
1368 CompileTask::CompileReason compile_reason,
1369 DirectiveSet* directive,
1370 TRAPS) {
1371
1372 // make sure arguments make sense
1373 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1374 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1375 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1376 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1377 // return quickly if possible
1378
1379 // lock, make sure that the compilation
1380 // isn't prohibited in a straightforward way.
1381 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1382 if (comp == nullptr || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1383 return nullptr;
1384 }
1385
1386 if (osr_bci == InvocationEntryBci) {
1387 // standard compilation
1388 nmethod* method_code = method->code();
1389 if (method_code != nullptr) {
1390 if (compilation_is_complete(method, osr_bci, comp_level)) {
1391 return method_code;
1392 }
1393 }
1394 if (method->is_not_compilable(comp_level)) {
1395 return nullptr;
1396 }
1397 } else {
1398 // osr compilation
1399 // We accept a higher level osr method
1400 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1401 if (nm != nullptr) return nm;
1402 if (method->is_not_osr_compilable(comp_level)) return nullptr;
1403 }
1404
1405 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1406 // some prerequisites that are compiler specific
1407 if (comp->is_c2() || comp->is_jvmci()) {
1408 InternalOOMEMark iom(THREAD);
1409 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1410 // Resolve all classes seen in the signature of the method
1411 // we are compiling.
1412 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1413 }
1414
1415 // If the method is native, do the lookup in the thread requesting
1416 // the compilation. Native lookups can load code, which is not
1417 // permitted during compilation.
1418 //
1419 // Note: A native method implies non-osr compilation which is
1420 // checked with an assertion at the entry of this method.
1421 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1422 address adr = NativeLookup::lookup(method, THREAD);
1423 if (HAS_PENDING_EXCEPTION) {
1424 // In case of an exception looking up the method, we just forget
1425 // about it. The interpreter will kick-in and throw the exception.
1426 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1427 CLEAR_PENDING_EXCEPTION;
1428 return nullptr;
1429 }
1430 assert(method->has_native_function(), "must have native code by now");
1431 }
1432
1433 // RedefineClasses() has replaced this method; just return
1434 if (method->is_old()) {
1435 return nullptr;
1436 }
1437
1438 // JVMTI -- post_compile_event requires jmethod_id() that may require
1439 // a lock the compiling thread can not acquire. Prefetch it here.
1440 if (JvmtiExport::should_post_compiled_method_load()) {
1441 method->jmethod_id();
1442 }
1443
1444 // do the compilation
1445 if (method->is_native()) {
1446 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1447 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1448 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1449 //
1450 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1451 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1452 AdapterHandlerLibrary::create_native_wrapper(method);
1453 } else {
1454 return nullptr;
1455 }
1456 } else {
1457 // If the compiler is shut off due to code cache getting full
1458 // fail out now so blocking compiles dont hang the java thread
1459 if (!should_compile_new_jobs()) {
1460 return nullptr;
1461 }
1462 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1463 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1464 }
1465
1466 // return requested nmethod
1467 // We accept a higher level osr method
1468 if (osr_bci == InvocationEntryBci) {
1469 return method->code();
1470 }
1471 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1472 }
1473
1474
1475 // ------------------------------------------------------------------
1476 // CompileBroker::compilation_is_complete
1477 //
1478 // See if compilation of this method is already complete.
1479 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1480 int osr_bci,
1481 int comp_level) {
1482 bool is_osr = (osr_bci != standard_entry_bci);
1483 if (is_osr) {
1484 if (method->is_not_osr_compilable(comp_level)) {
1485 return true;
1486 } else {
1487 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1488 return (result != nullptr);
1489 }
1490 } else {
1491 if (method->is_not_compilable(comp_level)) {
1492 return true;
1493 } else {
1494 nmethod* result = method->code();
1495 if (result == nullptr) return false;
1496 return comp_level == result->comp_level();
1497 }
1498 }
1499 }
1500
1501
1502 /**
1503 * See if this compilation is already requested.
1504 *
1505 * Implementation note: there is only a single "is in queue" bit
1506 * for each method. This means that the check below is overly
1507 * conservative in the sense that an osr compilation in the queue
1508 * will block a normal compilation from entering the queue (and vice
1509 * versa). This can be remedied by a full queue search to disambiguate
1510 * cases. If it is deemed profitable, this may be done.
1511 */
1512 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1513 return method->queued_for_compilation();
1514 }
1515
1516 // ------------------------------------------------------------------
1517 // CompileBroker::compilation_is_prohibited
1518 //
1519 // See if this compilation is not allowed.
1520 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1521 bool is_native = method->is_native();
1522 // Some compilers may not support the compilation of natives.
1523 AbstractCompiler *comp = compiler(comp_level);
1524 if (is_native && (!CICompileNatives || comp == nullptr)) {
1525 method->set_not_compilable_quietly("native methods not supported", comp_level);
1526 return true;
1527 }
1528
1529 bool is_osr = (osr_bci != standard_entry_bci);
1530 // Some compilers may not support on stack replacement.
1531 if (is_osr && (!CICompileOSR || comp == nullptr)) {
1532 method->set_not_osr_compilable("OSR not supported", comp_level);
1533 return true;
1534 }
1535
1536 // The method may be explicitly excluded by the user.
1537 double scale;
1538 if (excluded || (CompilerOracle::has_option_value(method, CompileCommandEnum::CompileThresholdScaling, scale) && scale == 0)) {
1539 bool quietly = CompilerOracle::be_quiet();
1540 if (PrintCompilation && !quietly) {
1541 // This does not happen quietly...
1542 ResourceMark rm;
1543 tty->print("### Excluding %s:%s",
1544 method->is_native() ? "generation of native wrapper" : "compile",
1545 (method->is_static() ? " static" : ""));
1546 method->print_short_name(tty);
1547 tty->cr();
1548 }
1549 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1550 }
1551
1552 return false;
1553 }
1554
1555 /**
1556 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1557 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1558 * The function also allows to generate separate compilation IDs for OSR compilations.
1559 */
1560 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1561 #ifdef ASSERT
1562 bool is_osr = (osr_bci != standard_entry_bci);
1563 int id;
1564 if (method->is_native()) {
1565 assert(!is_osr, "can't be osr");
1566 // Adapters, native wrappers and method handle intrinsics
1567 // should be generated always.
1568 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1569 } else if (CICountOSR && is_osr) {
1570 id = Atomic::add(&_osr_compilation_id, 1);
1571 if (CIStartOSR <= id && id < CIStopOSR) {
1572 return id;
1573 }
1574 } else {
1575 id = Atomic::add(&_compilation_id, 1);
1576 if (CIStart <= id && id < CIStop) {
1577 return id;
1578 }
1579 }
1580
1581 // Method was not in the appropriate compilation range.
1582 method->set_not_compilable_quietly("Not in requested compile id range");
1583 return 0;
1584 #else
1585 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1586 // only _compilation_id is incremented.
1587 return Atomic::add(&_compilation_id, 1);
1588 #endif
1589 }
1590
1591 // ------------------------------------------------------------------
1592 // CompileBroker::assign_compile_id_unlocked
1593 //
1594 // Public wrapper for assign_compile_id that acquires the needed locks
1595 int CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1596 MutexLocker locker(thread, MethodCompileQueue_lock);
1597 return assign_compile_id(method, osr_bci);
1598 }
1599
1600 // ------------------------------------------------------------------
1601 // CompileBroker::create_compile_task
1602 //
1603 // Create a CompileTask object representing the current request for
1604 // compilation. Add this task to the queue.
1605 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1606 int compile_id,
1607 const methodHandle& method,
1608 int osr_bci,
1609 int comp_level,
1610 const methodHandle& hot_method,
1611 int hot_count,
1612 CompileTask::CompileReason compile_reason,
1613 bool blocking) {
1614 CompileTask* new_task = CompileTask::allocate();
1615 new_task->initialize(compile_id, method, osr_bci, comp_level,
1616 hot_method, hot_count, compile_reason,
1617 blocking);
1618 queue->add(new_task);
1619 return new_task;
1620 }
1621
1622 #if INCLUDE_JVMCI
1623 // The number of milliseconds to wait before checking if
1624 // JVMCI compilation has made progress.
1625 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1626
1627 // The number of JVMCI compilation progress checks that must fail
1628 // before unblocking a thread waiting for a blocking compilation.
1629 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1630
1631 /**
1632 * Waits for a JVMCI compiler to complete a given task. This thread
1633 * waits until either the task completes or it sees no JVMCI compilation
1634 * progress for N consecutive milliseconds where N is
1635 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1636 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1637 *
1638 * @return true if this thread needs to free/recycle the task
1639 */
1640 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1641 assert(UseJVMCICompiler, "sanity");
1642 MonitorLocker ml(thread, task->lock());
1643 int progress_wait_attempts = 0;
1644 jint thread_jvmci_compilation_ticks = 0;
1645 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1646 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1647 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1648 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1649
1650 bool progress;
1651 if (jvmci_compile_state != nullptr) {
1652 jint ticks = jvmci_compile_state->compilation_ticks();
1653 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1654 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1655 thread_jvmci_compilation_ticks = ticks;
1656 } else {
1657 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1658 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1659 // compilation ticks to determine whether JVMCI compilation
1660 // is still making progress through the JVMCI compiler queue.
1661 jint ticks = jvmci->global_compilation_ticks();
1662 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1663 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1664 global_jvmci_compilation_ticks = ticks;
1665 }
1666
1667 if (!progress) {
1668 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1669 if (PrintCompilation) {
1670 task->print(tty, "wait for blocking compilation timed out");
1671 }
1672 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1673 break;
1674 }
1675 } else {
1676 progress_wait_attempts = 0;
1677 }
1678 }
1679 task->clear_waiter();
1680 return task->is_complete();
1681 }
1682 #endif
1683
1684 /**
1685 * Wait for the compilation task to complete.
1686 */
1687 void CompileBroker::wait_for_completion(CompileTask* task) {
1688 if (CIPrintCompileQueue) {
1689 ttyLocker ttyl;
1690 tty->print_cr("BLOCKING FOR COMPILE");
1691 }
1692
1693 assert(task->is_blocking(), "can only wait on blocking task");
1694
1695 JavaThread* thread = JavaThread::current();
1696
1697 methodHandle method(thread, task->method());
1698 bool free_task;
1699 #if INCLUDE_JVMCI
1700 AbstractCompiler* comp = compiler(task->comp_level());
1701 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) {
1702 // It may return before compilation is completed.
1703 // Note that libjvmci should not pre-emptively unblock
1704 // a thread waiting for a compilation as it does not call
1705 // Java code and so is not deadlock prone like jarjvmci.
1706 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1707 } else
1708 #endif
1709 {
1710 MonitorLocker ml(thread, task->lock());
1711 free_task = true;
1712 task->inc_waiting_for_completion();
1713 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1714 ml.wait();
1715 }
1716 task->dec_waiting_for_completion();
1717 }
1718
1719 if (free_task) {
1720 if (is_compilation_disabled_forever()) {
1721 CompileTask::free(task);
1722 return;
1723 }
1724
1725 // It is harmless to check this status without the lock, because
1726 // completion is a stable property (until the task object is recycled).
1727 assert(task->is_complete(), "Compilation should have completed");
1728
1729 // By convention, the waiter is responsible for recycling a
1730 // blocking CompileTask. Since there is only one waiter ever
1731 // waiting on a CompileTask, we know that no one else will
1732 // be using this CompileTask; we can free it.
1733 CompileTask::free(task);
1734 }
1735 }
1736
1737 /**
1738 * Initialize compiler thread(s) + compiler object(s). The postcondition
1739 * of this function is that the compiler runtimes are initialized and that
1740 * compiler threads can start compiling.
1741 */
1742 bool CompileBroker::init_compiler_runtime() {
1743 CompilerThread* thread = CompilerThread::current();
1744 AbstractCompiler* comp = thread->compiler();
1745 // Final sanity check - the compiler object must exist
1746 guarantee(comp != nullptr, "Compiler object must exist");
1747
1748 {
1749 // Must switch to native to allocate ci_env
1750 ThreadToNativeFromVM ttn(thread);
1751 ciEnv ci_env((CompileTask*)nullptr);
1752 // Cache Jvmti state
1753 ci_env.cache_jvmti_state();
1754 // Cache DTrace flags
1755 ci_env.cache_dtrace_flags();
1756
1757 // Switch back to VM state to do compiler initialization
1758 ThreadInVMfromNative tv(thread);
1759
1760 // Perform per-thread and global initializations
1761 comp->initialize();
1762 }
1763
1764 if (comp->is_failed()) {
1765 disable_compilation_forever();
1766 // If compiler initialization failed, no compiler thread that is specific to a
1767 // particular compiler runtime will ever start to compile methods.
1768 shutdown_compiler_runtime(comp, thread);
1769 return false;
1770 }
1771
1772 // C1 specific check
1773 if (comp->is_c1() && (thread->get_buffer_blob() == nullptr)) {
1774 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1775 return false;
1776 }
1777
1778 return true;
1779 }
1780
1781 void CompileBroker::free_buffer_blob_if_allocated(CompilerThread* thread) {
1782 BufferBlob* blob = thread->get_buffer_blob();
1783 if (blob != nullptr) {
1784 blob->purge();
1785 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1786 CodeCache::free(blob);
1787 }
1788 }
1789
1790 /**
1791 * If C1 and/or C2 initialization failed, we shut down all compilation.
1792 * We do this to keep things simple. This can be changed if it ever turns
1793 * out to be a problem.
1794 */
1795 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1796 free_buffer_blob_if_allocated(thread);
1797
1798 if (comp->should_perform_shutdown()) {
1799 // There are two reasons for shutting down the compiler
1800 // 1) compiler runtime initialization failed
1801 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1802 warning("%s initialization failed. Shutting down all compilers", comp->name());
1803
1804 // Only one thread per compiler runtime object enters here
1805 // Set state to shut down
1806 comp->set_shut_down();
1807
1808 // Delete all queued compilation tasks to make compiler threads exit faster.
1809 if (_c1_compile_queue != nullptr) {
1810 _c1_compile_queue->free_all();
1811 }
1812
1813 if (_c2_compile_queue != nullptr) {
1814 _c2_compile_queue->free_all();
1815 }
1816
1817 // Set flags so that we continue execution with using interpreter only.
1818 UseCompiler = false;
1819 UseInterpreter = true;
1820
1821 // We could delete compiler runtimes also. However, there are references to
1822 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1823 // fail. This can be done later if necessary.
1824 }
1825 }
1826
1827 /**
1828 * Helper function to create new or reuse old CompileLog.
1829 */
1830 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1831 if (!LogCompilation) return nullptr;
1832
1833 AbstractCompiler *compiler = ct->compiler();
1834 bool c1 = compiler->is_c1();
1835 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1836 assert(compiler_objects != nullptr, "must be initialized at this point");
1837 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1838 assert(logs != nullptr, "must be initialized at this point");
1839 int count = c1 ? _c1_count : _c2_count;
1840
1841 // Find Compiler number by its threadObj.
1842 oop compiler_obj = ct->threadObj();
1843 int compiler_number = 0;
1844 bool found = false;
1845 for (; compiler_number < count; compiler_number++) {
1846 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1847 found = true;
1848 break;
1849 }
1850 }
1851 assert(found, "Compiler must exist at this point");
1852
1853 // Determine pointer for this thread's log.
1854 CompileLog** log_ptr = &logs[compiler_number];
1855
1856 // Return old one if it exists.
1857 CompileLog* log = *log_ptr;
1858 if (log != nullptr) {
1859 ct->init_log(log);
1860 return log;
1861 }
1862
1863 // Create a new one and remember it.
1864 init_compiler_thread_log();
1865 log = ct->log();
1866 *log_ptr = log;
1867 return log;
1868 }
1869
1870 // ------------------------------------------------------------------
1871 // CompileBroker::compiler_thread_loop
1872 //
1873 // The main loop run by a CompilerThread.
1874 void CompileBroker::compiler_thread_loop() {
1875 CompilerThread* thread = CompilerThread::current();
1876 CompileQueue* queue = thread->queue();
1877 // For the thread that initializes the ciObjectFactory
1878 // this resource mark holds all the shared objects
1879 ResourceMark rm;
1880
1881 // First thread to get here will initialize the compiler interface
1882
1883 {
1884 ASSERT_IN_VM;
1885 MutexLocker only_one (thread, CompileThread_lock);
1886 if (!ciObjectFactory::is_initialized()) {
1887 ciObjectFactory::initialize();
1888 }
1889 }
1890
1891 // Open a log.
1892 CompileLog* log = get_log(thread);
1893 if (log != nullptr) {
1894 log->begin_elem("start_compile_thread name='%s' thread='%zu' process='%d'",
1895 thread->name(),
1896 os::current_thread_id(),
1897 os::current_process_id());
1898 log->stamp();
1899 log->end_elem();
1900 }
1901
1902 // If compiler thread/runtime initialization fails, exit the compiler thread
1903 if (!init_compiler_runtime()) {
1904 return;
1905 }
1906
1907 thread->start_idle_timer();
1908
1909 // Poll for new compilation tasks as long as the JVM runs. Compilation
1910 // should only be disabled if something went wrong while initializing the
1911 // compiler runtimes. This, in turn, should not happen. The only known case
1912 // when compiler runtime initialization fails is if there is not enough free
1913 // space in the code cache to generate the necessary stubs, etc.
1914 while (!is_compilation_disabled_forever()) {
1915 // We need this HandleMark to avoid leaking VM handles.
1916 HandleMark hm(thread);
1917
1918 CompileTask* task = queue->get(thread);
1919 if (task == nullptr) {
1920 if (UseDynamicNumberOfCompilerThreads) {
1921 // Access compiler_count under lock to enforce consistency.
1922 MutexLocker only_one(CompileThread_lock);
1923 if (can_remove(thread, true)) {
1924 if (trace_compiler_threads()) {
1925 ResourceMark rm;
1926 stringStream msg;
1927 msg.print("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1928 thread->name(), thread->idle_time_millis());
1929 print_compiler_threads(msg);
1930 }
1931
1932 // Notify compiler that the compiler thread is about to stop
1933 thread->compiler()->stopping_compiler_thread(thread);
1934
1935 free_buffer_blob_if_allocated(thread);
1936 return; // Stop this thread.
1937 }
1938 }
1939 } else {
1940 // Assign the task to the current thread. Mark this compilation
1941 // thread as active for the profiler.
1942 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1943 // occurs after fetching the compile task off the queue.
1944 CompileTaskWrapper ctw(task);
1945 methodHandle method(thread, task->method());
1946
1947 // Never compile a method if breakpoints are present in it
1948 if (method()->number_of_breakpoints() == 0) {
1949 // Compile the method.
1950 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1951 invoke_compiler_on_method(task);
1952 thread->start_idle_timer();
1953 } else {
1954 // After compilation is disabled, remove remaining methods from queue
1955 method->clear_queued_for_compilation();
1956 task->set_failure_reason("compilation is disabled");
1957 }
1958 } else {
1959 task->set_failure_reason("breakpoints are present");
1960 }
1961
1962 if (UseDynamicNumberOfCompilerThreads) {
1963 possibly_add_compiler_threads(thread);
1964 assert(!thread->has_pending_exception(), "should have been handled");
1965 }
1966 }
1967 }
1968
1969 // Shut down compiler runtime
1970 shutdown_compiler_runtime(thread->compiler(), thread);
1971 }
1972
1973 // ------------------------------------------------------------------
1974 // CompileBroker::init_compiler_thread_log
1975 //
1976 // Set up state required by +LogCompilation.
1977 void CompileBroker::init_compiler_thread_log() {
1978 CompilerThread* thread = CompilerThread::current();
1979 char file_name[4*K];
1980 FILE* fp = nullptr;
1981 intx thread_id = os::current_thread_id();
1982 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1983 const char* dir = (try_temp_dir ? os::get_temp_directory() : nullptr);
1984 if (dir == nullptr) {
1985 jio_snprintf(file_name, sizeof(file_name), "hs_c%zu_pid%u.log",
1986 thread_id, os::current_process_id());
1987 } else {
1988 jio_snprintf(file_name, sizeof(file_name),
1989 "%s%shs_c%zu_pid%u.log", dir,
1990 os::file_separator(), thread_id, os::current_process_id());
1991 }
1992
1993 fp = os::fopen(file_name, "wt");
1994 if (fp != nullptr) {
1995 if (LogCompilation && Verbose) {
1996 tty->print_cr("Opening compilation log %s", file_name);
1997 }
1998 CompileLog* log = new(mtCompiler) CompileLog(file_name, fp, thread_id);
1999 if (log == nullptr) {
2000 fclose(fp);
2001 return;
2002 }
2003 thread->init_log(log);
2004
2005 if (xtty != nullptr) {
2006 ttyLocker ttyl;
2007 // Record any per thread log files
2008 xtty->elem("thread_logfile thread='%zd' filename='%s'", thread_id, file_name);
2009 }
2010 return;
2011 }
2012 }
2013 warning("Cannot open log file: %s", file_name);
2014 }
2015
2016 void CompileBroker::log_metaspace_failure() {
2017 const char* message = "some methods may not be compiled because metaspace "
2018 "is out of memory";
2019 if (CompilationLog::log() != nullptr) {
2020 CompilationLog::log()->log_metaspace_failure(message);
2021 }
2022 if (PrintCompilation) {
2023 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2024 }
2025 }
2026
2027
2028 // ------------------------------------------------------------------
2029 // CompileBroker::set_should_block
2030 //
2031 // Set _should_block.
2032 // Call this from the VM, with Threads_lock held and a safepoint requested.
2033 void CompileBroker::set_should_block() {
2034 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2035 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2036 #ifndef PRODUCT
2037 if (PrintCompilation && (Verbose || WizardMode))
2038 tty->print_cr("notifying compiler thread pool to block");
2039 #endif
2040 _should_block = true;
2041 }
2042
2043 // ------------------------------------------------------------------
2044 // CompileBroker::maybe_block
2045 //
2046 // Call this from the compiler at convenient points, to poll for _should_block.
2047 void CompileBroker::maybe_block() {
2048 if (_should_block) {
2049 #ifndef PRODUCT
2050 if (PrintCompilation && (Verbose || WizardMode))
2051 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2052 #endif
2053 // If we are executing a task during the request to block, report the task
2054 // before disappearing.
2055 CompilerThread* thread = CompilerThread::current();
2056 if (thread != nullptr) {
2057 CompileTask* task = thread->task();
2058 if (task != nullptr) {
2059 if (PrintCompilation) {
2060 task->print(tty, "blocked");
2061 }
2062 task->print_ul("blocked");
2063 }
2064 }
2065 // Go to VM state and block for final VM shutdown safepoint.
2066 ThreadInVMfromNative tivfn(JavaThread::current());
2067 assert(false, "Should never unblock from TIVNM entry");
2068 }
2069 }
2070
2071 // wrapper for CodeCache::print_summary()
2072 static void codecache_print(bool detailed)
2073 {
2074 stringStream s;
2075 // Dump code cache into a buffer before locking the tty,
2076 {
2077 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2078 CodeCache::print_summary(&s, detailed);
2079 }
2080 ttyLocker ttyl;
2081 tty->print("%s", s.freeze());
2082 }
2083
2084 // wrapper for CodeCache::print_summary() using outputStream
2085 static void codecache_print(outputStream* out, bool detailed) {
2086 stringStream s;
2087
2088 // Dump code cache into a buffer
2089 {
2090 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2091 CodeCache::print_summary(&s, detailed);
2092 }
2093
2094 char* remaining_log = s.as_string();
2095 while (*remaining_log != '\0') {
2096 char* eol = strchr(remaining_log, '\n');
2097 if (eol == nullptr) {
2098 out->print_cr("%s", remaining_log);
2099 remaining_log = remaining_log + strlen(remaining_log);
2100 } else {
2101 *eol = '\0';
2102 out->print_cr("%s", remaining_log);
2103 remaining_log = eol + 1;
2104 }
2105 }
2106 }
2107
2108 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env,
2109 int compilable, const char* failure_reason) {
2110 if (!AbortVMOnCompilationFailure) {
2111 return;
2112 }
2113 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2114 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2115 }
2116 if (compilable == ciEnv::MethodCompilable_never) {
2117 fatal("Never compilable: %s", failure_reason);
2118 }
2119 }
2120
2121 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2122 assert(task != nullptr, "invariant");
2123 CompilerEvent::CompilationEvent::post(event,
2124 task->compile_id(),
2125 task->compiler()->type(),
2126 task->method(),
2127 task->comp_level(),
2128 task->is_success(),
2129 task->osr_bci() != CompileBroker::standard_entry_bci,
2130 task->nm_total_size(),
2131 task->num_inlined_bytecodes(),
2132 task->arena_bytes());
2133 }
2134
2135 int DirectivesStack::_depth = 0;
2136 CompilerDirectives* DirectivesStack::_top = nullptr;
2137 CompilerDirectives* DirectivesStack::_bottom = nullptr;
2138
2139 // Acquires Compilation_lock and waits for it to be notified
2140 // as long as WhiteBox::compilation_locked is true.
2141 static void whitebox_lock_compilation() {
2142 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2143 while (WhiteBox::compilation_locked) {
2144 locker.wait();
2145 }
2146 }
2147
2148 // ------------------------------------------------------------------
2149 // CompileBroker::invoke_compiler_on_method
2150 //
2151 // Compile a method.
2152 //
2153 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2154 task->print_ul();
2155 elapsedTimer time;
2156
2157 DirectiveSet* directive = task->directive();
2158 if (directive->PrintCompilationOption) {
2159 ResourceMark rm;
2160 task->print_tty();
2161 }
2162
2163 CompilerThread* thread = CompilerThread::current();
2164 ResourceMark rm(thread);
2165
2166 if (CompilationLog::log() != nullptr) {
2167 CompilationLog::log()->log_compile(thread, task);
2168 }
2169
2170 // Common flags.
2171 int compile_id = task->compile_id();
2172 int osr_bci = task->osr_bci();
2173 bool is_osr = (osr_bci != standard_entry_bci);
2174 bool should_log = (thread->log() != nullptr);
2175 bool should_break = false;
2176 const int task_level = task->comp_level();
2177 AbstractCompiler* comp = task->compiler();
2178 {
2179 // create the handle inside it's own block so it can't
2180 // accidentally be referenced once the thread transitions to
2181 // native. The NoHandleMark before the transition should catch
2182 // any cases where this occurs in the future.
2183 methodHandle method(thread, task->method());
2184
2185 assert(!method->is_native(), "no longer compile natives");
2186
2187 // Update compile information when using perfdata.
2188 if (UsePerfData) {
2189 update_compile_perf_data(thread, method, is_osr);
2190 }
2191
2192 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2193 }
2194
2195 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2196 if (should_log && !directive->LogOption) {
2197 should_log = false;
2198 }
2199
2200 // Allocate a new set of JNI handles.
2201 JNIHandleMark jhm(thread);
2202 Method* target_handle = task->method();
2203 int compilable = ciEnv::MethodCompilable;
2204 const char* failure_reason = nullptr;
2205 bool failure_reason_on_C_heap = false;
2206 const char* retry_message = nullptr;
2207
2208 #if INCLUDE_JVMCI
2209 if (UseJVMCICompiler && comp != nullptr && comp->is_jvmci()) {
2210 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2211
2212 TraceTime t1("compilation", &time);
2213 EventCompilation event;
2214 JVMCICompileState compile_state(task, jvmci);
2215 JVMCIRuntime *runtime = nullptr;
2216
2217 if (JVMCI::in_shutdown()) {
2218 failure_reason = "in JVMCI shutdown";
2219 retry_message = "not retryable";
2220 compilable = ciEnv::MethodCompilable_never;
2221 } else if (compile_state.target_method_is_old()) {
2222 // Skip redefined methods
2223 failure_reason = "redefined method";
2224 retry_message = "not retryable";
2225 compilable = ciEnv::MethodCompilable_never;
2226 } else {
2227 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2228 if (env.init_error() != JNI_OK) {
2229 const char* msg = env.init_error_msg();
2230 failure_reason = os::strdup(err_msg("Error attaching to libjvmci (err: %d, %s)",
2231 env.init_error(), msg == nullptr ? "unknown" : msg), mtJVMCI);
2232 bool reason_on_C_heap = true;
2233 // In case of JNI_ENOMEM, there's a good chance a subsequent attempt to create libjvmci or attach to it
2234 // might succeed. Other errors most likely indicate a non-recoverable error in the JVMCI runtime.
2235 bool retryable = env.init_error() == JNI_ENOMEM;
2236 compile_state.set_failure(retryable, failure_reason, reason_on_C_heap);
2237 }
2238 if (failure_reason == nullptr) {
2239 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2240 // Must switch to native to block
2241 ThreadToNativeFromVM ttn(thread);
2242 whitebox_lock_compilation();
2243 }
2244 methodHandle method(thread, target_handle);
2245 runtime = env.runtime();
2246 runtime->compile_method(&env, jvmci, method, osr_bci);
2247
2248 failure_reason = compile_state.failure_reason();
2249 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2250 if (!compile_state.retryable()) {
2251 retry_message = "not retryable";
2252 compilable = ciEnv::MethodCompilable_not_at_tier;
2253 }
2254 if (!task->is_success()) {
2255 assert(failure_reason != nullptr, "must specify failure_reason");
2256 }
2257 }
2258 }
2259 if (!task->is_success() && !JVMCI::in_shutdown()) {
2260 handle_compile_error(thread, task, nullptr, compilable, failure_reason);
2261 }
2262 if (event.should_commit()) {
2263 post_compilation_event(event, task);
2264 }
2265
2266 if (runtime != nullptr) {
2267 runtime->post_compile(thread);
2268 }
2269 } else
2270 #endif // INCLUDE_JVMCI
2271 {
2272 NoHandleMark nhm;
2273 ThreadToNativeFromVM ttn(thread);
2274
2275 ciEnv ci_env(task);
2276 if (should_break) {
2277 ci_env.set_break_at_compile(true);
2278 }
2279 if (should_log) {
2280 ci_env.set_log(thread->log());
2281 }
2282 assert(thread->env() == &ci_env, "set by ci_env");
2283 // The thread-env() field is cleared in ~CompileTaskWrapper.
2284
2285 // Cache Jvmti state
2286 bool method_is_old = ci_env.cache_jvmti_state();
2287
2288 // Skip redefined methods
2289 if (method_is_old) {
2290 ci_env.record_method_not_compilable("redefined method", true);
2291 }
2292
2293 // Cache DTrace flags
2294 ci_env.cache_dtrace_flags();
2295
2296 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2297
2298 TraceTime t1("compilation", &time);
2299 EventCompilation event;
2300
2301 if (comp == nullptr) {
2302 ci_env.record_method_not_compilable("no compiler");
2303 } else if (!ci_env.failing()) {
2304 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2305 whitebox_lock_compilation();
2306 }
2307 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2308
2309 /* Repeat compilation without installing code for profiling purposes */
2310 int repeat_compilation_count = directive->RepeatCompilationOption;
2311 while (repeat_compilation_count > 0) {
2312 ResourceMark rm(thread);
2313 task->print_ul("NO CODE INSTALLED");
2314 comp->compile_method(&ci_env, target, osr_bci, false, directive);
2315 repeat_compilation_count--;
2316 }
2317 }
2318
2319
2320 if (!ci_env.failing() && !task->is_success()) {
2321 assert(ci_env.failure_reason() != nullptr, "expect failure reason");
2322 assert(false, "compiler should always document failure: %s", ci_env.failure_reason());
2323 // The compiler elected, without comment, not to register a result.
2324 // Do not attempt further compilations of this method.
2325 ci_env.record_method_not_compilable("compile failed");
2326 }
2327
2328 // Copy this bit to the enclosing block:
2329 compilable = ci_env.compilable();
2330
2331 if (ci_env.failing()) {
2332 // Duplicate the failure reason string, so that it outlives ciEnv
2333 failure_reason = os::strdup(ci_env.failure_reason(), mtCompiler);
2334 failure_reason_on_C_heap = true;
2335 retry_message = ci_env.retry_message();
2336 ci_env.report_failure(failure_reason);
2337 }
2338
2339 if (ci_env.failing()) {
2340 handle_compile_error(thread, task, &ci_env, compilable, failure_reason);
2341 }
2342 if (event.should_commit()) {
2343 post_compilation_event(event, task);
2344 }
2345 }
2346
2347 if (failure_reason != nullptr) {
2348 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2349 if (CompilationLog::log() != nullptr) {
2350 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message);
2351 }
2352 if (PrintCompilation || directive->PrintCompilationOption) {
2353 FormatBufferResource msg = retry_message != nullptr ?
2354 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2355 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2356 task->print(tty, msg);
2357 }
2358 }
2359
2360 DirectivesStack::release(directive);
2361
2362 methodHandle method(thread, task->method());
2363
2364 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2365
2366 collect_statistics(thread, time, task);
2367
2368 if (PrintCompilation && PrintCompilation2) {
2369 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2370 tty->print("%4d ", compile_id); // print compilation number
2371 tty->print("%s ", (is_osr ? "%" : " "));
2372 if (task->is_success()) {
2373 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size());
2374 }
2375 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2376 }
2377
2378 Log(compilation, codecache) log;
2379 if (log.is_debug()) {
2380 LogStream ls(log.debug());
2381 codecache_print(&ls, /* detailed= */ false);
2382 }
2383 if (PrintCodeCacheOnCompilation) {
2384 codecache_print(/* detailed= */ false);
2385 }
2386 // Disable compilation, if required.
2387 switch (compilable) {
2388 case ciEnv::MethodCompilable_never:
2389 if (is_osr)
2390 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2391 else
2392 method->set_not_compilable_quietly("MethodCompilable_never");
2393 break;
2394 case ciEnv::MethodCompilable_not_at_tier:
2395 if (is_osr)
2396 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2397 else
2398 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2399 break;
2400 }
2401
2402 // Note that the queued_for_compilation bits are cleared without
2403 // protection of a mutex. [They were set by the requester thread,
2404 // when adding the task to the compile queue -- at which time the
2405 // compile queue lock was held. Subsequently, we acquired the compile
2406 // queue lock to get this task off the compile queue; thus (to belabour
2407 // the point somewhat) our clearing of the bits must be occurring
2408 // only after the setting of the bits. See also 14012000 above.
2409 method->clear_queued_for_compilation();
2410 }
2411
2412 /**
2413 * The CodeCache is full. Print warning and disable compilation.
2414 * Schedule code cache cleaning so compilation can continue later.
2415 * This function needs to be called only from CodeCache::allocate(),
2416 * since we currently handle a full code cache uniformly.
2417 */
2418 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) {
2419 UseInterpreter = true;
2420 if (UseCompiler || AlwaysCompileLoopMethods ) {
2421 if (xtty != nullptr) {
2422 stringStream s;
2423 // Dump code cache state into a buffer before locking the tty,
2424 // because log_state() will use locks causing lock conflicts.
2425 CodeCache::log_state(&s);
2426 // Lock to prevent tearing
2427 ttyLocker ttyl;
2428 xtty->begin_elem("code_cache_full");
2429 xtty->print("%s", s.freeze());
2430 xtty->stamp();
2431 xtty->end_elem();
2432 }
2433
2434 #ifndef PRODUCT
2435 if (ExitOnFullCodeCache) {
2436 codecache_print(/* detailed= */ true);
2437 before_exit(JavaThread::current());
2438 exit_globals(); // will delete tty
2439 vm_direct_exit(1);
2440 }
2441 #endif
2442 if (UseCodeCacheFlushing) {
2443 // Since code cache is full, immediately stop new compiles
2444 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2445 log_info(codecache)("Code cache is full - disabling compilation");
2446 }
2447 } else {
2448 disable_compilation_forever();
2449 }
2450
2451 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2452 }
2453 }
2454
2455 // ------------------------------------------------------------------
2456 // CompileBroker::update_compile_perf_data
2457 //
2458 // Record this compilation for debugging purposes.
2459 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2460 ResourceMark rm;
2461 char* method_name = method->name()->as_C_string();
2462 char current_method[CompilerCounters::cmname_buffer_length];
2463 size_t maxLen = CompilerCounters::cmname_buffer_length;
2464
2465 const char* class_name = method->method_holder()->name()->as_C_string();
2466
2467 size_t s1len = strlen(class_name);
2468 size_t s2len = strlen(method_name);
2469
2470 // check if we need to truncate the string
2471 if (s1len + s2len + 2 > maxLen) {
2472
2473 // the strategy is to lop off the leading characters of the
2474 // class name and the trailing characters of the method name.
2475
2476 if (s2len + 2 > maxLen) {
2477 // lop of the entire class name string, let snprintf handle
2478 // truncation of the method name.
2479 class_name += s1len; // null string
2480 }
2481 else {
2482 // lop off the extra characters from the front of the class name
2483 class_name += ((s1len + s2len + 2) - maxLen);
2484 }
2485 }
2486
2487 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2488
2489 int last_compile_type = normal_compile;
2490 if (CICountOSR && is_osr) {
2491 last_compile_type = osr_compile;
2492 } else if (CICountNative && method->is_native()) {
2493 last_compile_type = native_compile;
2494 }
2495
2496 CompilerCounters* counters = thread->counters();
2497 counters->set_current_method(current_method);
2498 counters->set_compile_type((jlong) last_compile_type);
2499 }
2500
2501 // ------------------------------------------------------------------
2502 // CompileBroker::collect_statistics
2503 //
2504 // Collect statistics about the compilation.
2505
2506 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2507 bool success = task->is_success();
2508 methodHandle method (thread, task->method());
2509 int compile_id = task->compile_id();
2510 bool is_osr = (task->osr_bci() != standard_entry_bci);
2511 const int comp_level = task->comp_level();
2512 CompilerCounters* counters = thread->counters();
2513
2514 MutexLocker locker(CompileStatistics_lock);
2515
2516 // _perf variables are production performance counters which are
2517 // updated regardless of the setting of the CITime and CITimeEach flags
2518 //
2519
2520 // account all time, including bailouts and failures in this counter;
2521 // C1 and C2 counters are counting both successful and unsuccessful compiles
2522 _t_total_compilation.add(time);
2523
2524 // Update compilation times. Used by the implementation of JFR CompilerStatistics
2525 // and java.lang.management.CompilationMXBean.
2526 _perf_total_compilation->inc(time.ticks());
2527 _peak_compilation_time = MAX2(time.milliseconds(), _peak_compilation_time);
2528
2529 if (!success) {
2530 _total_bailout_count++;
2531 if (UsePerfData) {
2532 _perf_last_failed_method->set_value(counters->current_method());
2533 _perf_last_failed_type->set_value(counters->compile_type());
2534 _perf_total_bailout_count->inc();
2535 }
2536 _t_bailedout_compilation.add(time);
2537 } else if (!task->is_success()) {
2538 if (UsePerfData) {
2539 _perf_last_invalidated_method->set_value(counters->current_method());
2540 _perf_last_invalidated_type->set_value(counters->compile_type());
2541 _perf_total_invalidated_count->inc();
2542 }
2543 _total_invalidated_count++;
2544 _t_invalidated_compilation.add(time);
2545 } else {
2546 // Compilation succeeded
2547 if (CITime) {
2548 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2549 if (is_osr) {
2550 _t_osr_compilation.add(time);
2551 _sum_osr_bytes_compiled += bytes_compiled;
2552 } else {
2553 _t_standard_compilation.add(time);
2554 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2555 }
2556
2557 // Collect statistic per compilation level
2558 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2559 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2560 if (is_osr) {
2561 stats->_osr.update(time, bytes_compiled);
2562 } else {
2563 stats->_standard.update(time, bytes_compiled);
2564 }
2565 stats->_nmethods_size += task->nm_total_size();
2566 stats->_nmethods_code_size += task->nm_insts_size();
2567 } else {
2568 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2569 }
2570
2571 // Collect statistic per compiler
2572 AbstractCompiler* comp = compiler(comp_level);
2573 if (comp) {
2574 CompilerStatistics* stats = comp->stats();
2575 if (is_osr) {
2576 stats->_osr.update(time, bytes_compiled);
2577 } else {
2578 stats->_standard.update(time, bytes_compiled);
2579 }
2580 stats->_nmethods_size += task->nm_total_size();
2581 stats->_nmethods_code_size += task->nm_insts_size();
2582 } else { // if (!comp)
2583 assert(false, "Compiler object must exist");
2584 }
2585 }
2586
2587 if (UsePerfData) {
2588 // save the name of the last method compiled
2589 _perf_last_method->set_value(counters->current_method());
2590 _perf_last_compile_type->set_value(counters->compile_type());
2591 _perf_last_compile_size->set_value(method->code_size() +
2592 task->num_inlined_bytecodes());
2593 if (is_osr) {
2594 _perf_osr_compilation->inc(time.ticks());
2595 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2596 } else {
2597 _perf_standard_compilation->inc(time.ticks());
2598 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2599 }
2600 }
2601
2602 if (CITimeEach) {
2603 double compile_time = time.seconds();
2604 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2605 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2606 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2607 }
2608
2609 // Collect counts of successful compilations
2610 _sum_nmethod_size += task->nm_total_size();
2611 _sum_nmethod_code_size += task->nm_insts_size();
2612 _total_compile_count++;
2613
2614 if (UsePerfData) {
2615 _perf_sum_nmethod_size->inc( task->nm_total_size());
2616 _perf_sum_nmethod_code_size->inc(task->nm_insts_size());
2617 _perf_total_compile_count->inc();
2618 }
2619
2620 if (is_osr) {
2621 if (UsePerfData) _perf_total_osr_compile_count->inc();
2622 _total_osr_compile_count++;
2623 } else {
2624 if (UsePerfData) _perf_total_standard_compile_count->inc();
2625 _total_standard_compile_count++;
2626 }
2627 }
2628 // set the current method for the thread to null
2629 if (UsePerfData) counters->set_current_method("");
2630 }
2631
2632 const char* CompileBroker::compiler_name(int comp_level) {
2633 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2634 if (comp == nullptr) {
2635 return "no compiler";
2636 } else {
2637 return (comp->name());
2638 }
2639 }
2640
2641 jlong CompileBroker::total_compilation_ticks() {
2642 return _perf_total_compilation != nullptr ? _perf_total_compilation->get_value() : 0;
2643 }
2644
2645 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2646 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}",
2647 name, stats->bytes_per_second(),
2648 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2649 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2650 stats->_nmethods_size, stats->_nmethods_code_size);
2651 }
2652
2653 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2654 if (per_compiler) {
2655 if (aggregate) {
2656 tty->cr();
2657 tty->print_cr("Individual compiler times (for compiled methods only)");
2658 tty->print_cr("------------------------------------------------");
2659 tty->cr();
2660 }
2661 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2662 AbstractCompiler* comp = _compilers[i];
2663 if (comp != nullptr) {
2664 print_times(comp->name(), comp->stats());
2665 }
2666 }
2667 if (aggregate) {
2668 tty->cr();
2669 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2670 tty->print_cr("------------------------------------------------");
2671 tty->cr();
2672 }
2673 char tier_name[256];
2674 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2675 CompilerStatistics* stats = &_stats_per_level[tier-1];
2676 os::snprintf_checked(tier_name, sizeof(tier_name), "Tier%d", tier);
2677 print_times(tier_name, stats);
2678 }
2679 }
2680
2681 if (!aggregate) {
2682 return;
2683 }
2684
2685 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2686 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2687 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2688
2689 uint standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2690 uint osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2691
2692 uint standard_compile_count = CompileBroker::_total_standard_compile_count;
2693 uint osr_compile_count = CompileBroker::_total_osr_compile_count;
2694 uint total_compile_count = CompileBroker::_total_compile_count;
2695 uint total_bailout_count = CompileBroker::_total_bailout_count;
2696 uint total_invalidated_count = CompileBroker::_total_invalidated_count;
2697
2698 uint nmethods_code_size = CompileBroker::_sum_nmethod_code_size;
2699 uint nmethods_size = CompileBroker::_sum_nmethod_size;
2700
2701 tty->cr();
2702 tty->print_cr("Accumulated compiler times");
2703 tty->print_cr("----------------------------------------------------------");
2704 //0000000000111111111122222222223333333333444444444455555555556666666666
2705 //0123456789012345678901234567890123456789012345678901234567890123456789
2706 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2707 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2708 standard_compilation.seconds(),
2709 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2710 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2711 CompileBroker::_t_bailedout_compilation.seconds(),
2712 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2713 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2714 osr_compilation.seconds(),
2715 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2716 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2717 CompileBroker::_t_invalidated_compilation.seconds(),
2718 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2719
2720 AbstractCompiler *comp = compiler(CompLevel_simple);
2721 if (comp != nullptr) {
2722 tty->cr();
2723 comp->print_timers();
2724 }
2725 comp = compiler(CompLevel_full_optimization);
2726 if (comp != nullptr) {
2727 tty->cr();
2728 comp->print_timers();
2729 }
2730 #if INCLUDE_JVMCI
2731 if (EnableJVMCI) {
2732 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null());
2733 if (jvmci_comp != nullptr && jvmci_comp != comp) {
2734 tty->cr();
2735 jvmci_comp->print_timers();
2736 }
2737 }
2738 #endif
2739
2740 tty->cr();
2741 tty->print_cr(" Total compiled methods : %8u methods", total_compile_count);
2742 tty->print_cr(" Standard compilation : %8u methods", standard_compile_count);
2743 tty->print_cr(" On stack replacement : %8u methods", osr_compile_count);
2744 uint tcb = osr_bytes_compiled + standard_bytes_compiled;
2745 tty->print_cr(" Total compiled bytecodes : %8u bytes", tcb);
2746 tty->print_cr(" Standard compilation : %8u bytes", standard_bytes_compiled);
2747 tty->print_cr(" On stack replacement : %8u bytes", osr_bytes_compiled);
2748 double tcs = total_compilation.seconds();
2749 uint bps = tcs == 0.0 ? 0 : (uint)(tcb / tcs);
2750 tty->print_cr(" Average compilation speed : %8u bytes/s", bps);
2751 tty->cr();
2752 tty->print_cr(" nmethod code size : %8u bytes", nmethods_code_size);
2753 tty->print_cr(" nmethod total size : %8u bytes", nmethods_size);
2754 }
2755
2756 // Print general/accumulated JIT information.
2757 void CompileBroker::print_info(outputStream *out) {
2758 if (out == nullptr) out = tty;
2759 out->cr();
2760 out->print_cr("======================");
2761 out->print_cr(" General JIT info ");
2762 out->print_cr("======================");
2763 out->cr();
2764 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2765 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2766 out->cr();
2767 out->print_cr("CodeCache overview");
2768 out->print_cr("--------------------------------------------------------");
2769 out->cr();
2770 out->print_cr(" Reserved size : %7zu KB", CodeCache::max_capacity() / K);
2771 out->print_cr(" Committed size : %7zu KB", CodeCache::capacity() / K);
2772 out->print_cr(" Unallocated capacity : %7zu KB", CodeCache::unallocated_capacity() / K);
2773 out->cr();
2774 }
2775
2776 // Note: tty_lock must not be held upon entry to this function.
2777 // Print functions called from herein do "micro-locking" on tty_lock.
2778 // That's a tradeoff which keeps together important blocks of output.
2779 // At the same time, continuous tty_lock hold time is kept in check,
2780 // preventing concurrently printing threads from stalling a long time.
2781 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2782 TimeStamp ts_total;
2783 TimeStamp ts_global;
2784 TimeStamp ts;
2785
2786 bool allFun = !strcmp(function, "all");
2787 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2788 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2789 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2790 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2791 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2792 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2793 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2794 bool discard = !strcmp(function, "discard") || allFun;
2795
2796 if (out == nullptr) {
2797 out = tty;
2798 }
2799
2800 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2801 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2802 out->cr();
2803 return;
2804 }
2805
2806 ts_total.update(); // record starting point
2807
2808 if (aggregate) {
2809 print_info(out);
2810 }
2811
2812 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2813 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2814 // When we request individual parts of the analysis via the jcmd interface, it is possible
2815 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2816 // updated the aggregated data. We will then see a modified, but again consistent, view
2817 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2818 // a lock across user interaction.
2819
2820 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2821 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2822 // leading to an unnecessarily long hold time of the other locks we acquired before.
2823 ts.update(); // record starting point
2824 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2825 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2826
2827 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2828 // Unfortunately, such protection is not sufficient:
2829 // When a new nmethod is created via ciEnv::register_method(), the
2830 // Compile_lock is taken first. After some initializations,
2831 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2832 // immediately (after finalizing the oop references). To lock out concurrent
2833 // modifiers, we have to grab both locks as well in the described sequence.
2834 //
2835 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2836 // for the entire duration of aggregation and printing. That makes sure we see
2837 // a consistent picture and do not run into issues caused by concurrent alterations.
2838 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2839 !Compile_lock->owned_by_self();
2840 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2841 !CodeCache_lock->owned_by_self();
2842 bool take_global_lock_1 = allFun && should_take_Compile_lock;
2843 bool take_global_lock_2 = allFun && should_take_CodeCache_lock;
2844 bool take_function_lock_1 = !allFun && should_take_Compile_lock;
2845 bool take_function_lock_2 = !allFun && should_take_CodeCache_lock;
2846 bool take_global_locks = take_global_lock_1 || take_global_lock_2;
2847 bool take_function_locks = take_function_lock_1 || take_function_lock_2;
2848
2849 ts_global.update(); // record starting point
2850
2851 ConditionalMutexLocker mu1(Compile_lock, take_global_lock_1, Mutex::_safepoint_check_flag);
2852 ConditionalMutexLocker mu2(CodeCache_lock, take_global_lock_2, Mutex::_no_safepoint_check_flag);
2853 if (take_global_locks) {
2854 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2855 ts_global.update(); // record starting point
2856 }
2857
2858 if (aggregate) {
2859 ts.update(); // record starting point
2860 ConditionalMutexLocker mu11(Compile_lock, take_function_lock_1, Mutex::_safepoint_check_flag);
2861 ConditionalMutexLocker mu22(CodeCache_lock, take_function_lock_2, Mutex::_no_safepoint_check_flag);
2862 if (take_function_locks) {
2863 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2864 }
2865
2866 ts.update(); // record starting point
2867 CodeCache::aggregate(out, granularity);
2868 if (take_function_locks) {
2869 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2870 }
2871 }
2872
2873 if (usedSpace) CodeCache::print_usedSpace(out);
2874 if (freeSpace) CodeCache::print_freeSpace(out);
2875 if (methodCount) CodeCache::print_count(out);
2876 if (methodSpace) CodeCache::print_space(out);
2877 if (methodAge) CodeCache::print_age(out);
2878 if (methodNames) {
2879 if (allFun) {
2880 // print_names() can only be used safely if the locks have been continuously held
2881 // since aggregation begin. That is true only for function "all".
2882 CodeCache::print_names(out);
2883 } else {
2884 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2885 }
2886 }
2887 if (discard) CodeCache::discard(out);
2888
2889 if (take_global_locks) {
2890 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2891 }
2892 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2893 }