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