1 /*
2 * Copyright (c) 1999, 2023, 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/compilationPolicy.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerEvent.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "jvm.h"
42 #include "jfr/jfrEvents.hpp"
43 #include "logging/log.hpp"
44 #include "logging/logStream.hpp"
45 #include "memory/allocation.inline.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "oops/methodData.hpp"
49 #include "oops/method.inline.hpp"
50 #include "oops/oop.inline.hpp"
51 #include "prims/jvmtiExport.hpp"
52 #include "prims/nativeLookup.hpp"
53 #include "prims/whitebox.hpp"
54 #include "runtime/atomic.hpp"
55 #include "runtime/escapeBarrier.hpp"
56 #include "runtime/globals_extension.hpp"
57 #include "runtime/handles.inline.hpp"
58 #include "runtime/init.hpp"
59 #include "runtime/interfaceSupport.inline.hpp"
60 #include "runtime/java.hpp"
61 #include "runtime/javaCalls.hpp"
62 #include "runtime/jniHandles.inline.hpp"
63 #include "runtime/os.hpp"
64 #include "runtime/perfData.hpp"
65 #include "runtime/safepointVerifiers.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/threads.hpp"
68 #include "runtime/threadSMR.hpp"
69 #include "runtime/timerTrace.hpp"
70 #include "runtime/vframe.inline.hpp"
71 #include "utilities/debug.hpp"
72 #include "utilities/dtrace.hpp"
73 #include "utilities/events.hpp"
74 #include "utilities/formatBuffer.hpp"
75 #include "utilities/macros.hpp"
76 #ifdef COMPILER1
77 #include "c1/c1_Compiler.hpp"
78 #endif
79 #ifdef COMPILER2
80 #include "opto/c2compiler.hpp"
81 #endif
82 #if INCLUDE_JVMCI
83 #include "jvmci/jvmciEnv.hpp"
84 #include "jvmci/jvmciRuntime.hpp"
85 #endif
86
87 #ifdef DTRACE_ENABLED
88
89 // Only bother with this argument setup if dtrace is available
90
91 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
92 { \
93 Symbol* klass_name = (method)->klass_name(); \
94 Symbol* name = (method)->name(); \
95 Symbol* signature = (method)->signature(); \
96 HOTSPOT_METHOD_COMPILE_BEGIN( \
97 (char *) comp_name, strlen(comp_name), \
98 (char *) klass_name->bytes(), klass_name->utf8_length(), \
99 (char *) name->bytes(), name->utf8_length(), \
100 (char *) signature->bytes(), signature->utf8_length()); \
101 }
102
103 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
104 { \
105 Symbol* klass_name = (method)->klass_name(); \
106 Symbol* name = (method)->name(); \
107 Symbol* signature = (method)->signature(); \
108 HOTSPOT_METHOD_COMPILE_END( \
109 (char *) comp_name, strlen(comp_name), \
110 (char *) klass_name->bytes(), klass_name->utf8_length(), \
111 (char *) name->bytes(), name->utf8_length(), \
112 (char *) signature->bytes(), signature->utf8_length(), (success)); \
113 }
114
115 #else // ndef DTRACE_ENABLED
116
117 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
118 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
119
120 #endif // ndef DTRACE_ENABLED
121
122 bool CompileBroker::_initialized = false;
123 volatile bool CompileBroker::_should_block = false;
124 volatile int CompileBroker::_print_compilation_warning = 0;
125 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
126
127 // The installed compiler(s)
128 AbstractCompiler* CompileBroker::_compilers[2];
129
130 // The maximum numbers of compiler threads to be determined during startup.
131 int CompileBroker::_c1_count = 0;
132 int CompileBroker::_c2_count = 0;
133
134 // An array of compiler names as Java String objects
135 jobject* CompileBroker::_compiler1_objects = nullptr;
136 jobject* CompileBroker::_compiler2_objects = nullptr;
137
138 CompileLog** CompileBroker::_compiler1_logs = nullptr;
139 CompileLog** CompileBroker::_compiler2_logs = nullptr;
140
141 // These counters are used to assign an unique ID to each compilation.
142 volatile jint CompileBroker::_compilation_id = 0;
143 volatile jint CompileBroker::_osr_compilation_id = 0;
144 volatile jint CompileBroker::_native_compilation_id = 0;
145
146 // Performance counters
147 PerfCounter* CompileBroker::_perf_total_compilation = nullptr;
148 PerfCounter* CompileBroker::_perf_osr_compilation = nullptr;
149 PerfCounter* CompileBroker::_perf_standard_compilation = nullptr;
150
151 PerfCounter* CompileBroker::_perf_total_bailout_count = nullptr;
152 PerfCounter* CompileBroker::_perf_total_invalidated_count = nullptr;
153 PerfCounter* CompileBroker::_perf_total_compile_count = nullptr;
154 PerfCounter* CompileBroker::_perf_total_osr_compile_count = nullptr;
155 PerfCounter* CompileBroker::_perf_total_standard_compile_count = nullptr;
156
157 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = nullptr;
158 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = nullptr;
159 PerfCounter* CompileBroker::_perf_sum_nmethod_size = nullptr;
160 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = nullptr;
161
162 PerfStringVariable* CompileBroker::_perf_last_method = nullptr;
163 PerfStringVariable* CompileBroker::_perf_last_failed_method = nullptr;
164 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = nullptr;
165 PerfVariable* CompileBroker::_perf_last_compile_type = nullptr;
166 PerfVariable* CompileBroker::_perf_last_compile_size = nullptr;
167 PerfVariable* CompileBroker::_perf_last_failed_type = nullptr;
168 PerfVariable* CompileBroker::_perf_last_invalidated_type = nullptr;
169
170 // Timers and counters for generating statistics
171 elapsedTimer CompileBroker::_t_total_compilation;
172 elapsedTimer CompileBroker::_t_osr_compilation;
173 elapsedTimer CompileBroker::_t_standard_compilation;
174 elapsedTimer CompileBroker::_t_invalidated_compilation;
175 elapsedTimer CompileBroker::_t_bailedout_compilation;
176
177 uint CompileBroker::_total_bailout_count = 0;
178 uint CompileBroker::_total_invalidated_count = 0;
179 uint CompileBroker::_total_compile_count = 0;
180 uint CompileBroker::_total_osr_compile_count = 0;
181 uint CompileBroker::_total_standard_compile_count = 0;
182 uint CompileBroker::_total_compiler_stopped_count = 0;
183 uint CompileBroker::_total_compiler_restarted_count = 0;
184
185 uint CompileBroker::_sum_osr_bytes_compiled = 0;
186 uint CompileBroker::_sum_standard_bytes_compiled = 0;
187 uint CompileBroker::_sum_nmethod_size = 0;
188 uint CompileBroker::_sum_nmethod_code_size = 0;
189
190 jlong CompileBroker::_peak_compilation_time = 0;
191
192 CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization];
193
194 CompileQueue* CompileBroker::_c2_compile_queue = nullptr;
195 CompileQueue* CompileBroker::_c1_compile_queue = nullptr;
196
197 bool compileBroker_init() {
198 if (LogEvents) {
199 CompilationLog::init();
200 }
201
202 // init directives stack, adding default directive
203 DirectivesStack::init();
204
205 if (DirectivesParser::has_file()) {
206 return DirectivesParser::parse_from_flag();
207 } else if (CompilerDirectivesPrint) {
208 // Print default directive even when no other was added
209 DirectivesStack::print(tty);
210 }
211
212 return true;
213 }
214
215 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
216 CompilerThread* thread = CompilerThread::current();
217 thread->set_task(task);
218 CompileLog* log = thread->log();
219 if (log != nullptr && !task->is_unloaded()) task->log_task_start(log);
220 }
221
222 CompileTaskWrapper::~CompileTaskWrapper() {
223 CompilerThread* thread = CompilerThread::current();
224 CompileTask* task = thread->task();
225 CompileLog* log = thread->log();
226 if (log != nullptr && !task->is_unloaded()) task->log_task_done(log);
227 thread->set_task(nullptr);
228 thread->set_env(nullptr);
229 if (task->is_blocking()) {
230 bool free_task = false;
231 {
232 MutexLocker notifier(thread, task->lock());
233 task->mark_complete();
234 #if INCLUDE_JVMCI
235 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
236 if (!task->has_waiter()) {
237 // The waiting thread timed out and thus did not free the task.
238 free_task = true;
239 }
240 task->set_blocking_jvmci_compile_state(nullptr);
241 }
242 #endif
243 if (!free_task) {
244 // Notify the waiting thread that the compilation has completed
245 // so that it can free the task.
246 task->lock()->notify_all();
247 }
248 }
249 if (free_task) {
250 // The task can only be freed once the task lock is released.
251 CompileTask::free(task);
252 }
253 } else {
254 task->mark_complete();
255
256 // By convention, the compiling thread is responsible for
257 // recycling a non-blocking CompileTask.
258 CompileTask::free(task);
259 }
260 }
261
262 /**
263 * Check if a CompilerThread can be removed and update count if requested.
264 */
265 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
266 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
267 if (!ReduceNumberOfCompilerThreads) return false;
268
269 AbstractCompiler *compiler = ct->compiler();
270 int compiler_count = compiler->num_compiler_threads();
271 bool c1 = compiler->is_c1();
272
273 // Keep at least 1 compiler thread of each type.
274 if (compiler_count < 2) return false;
275
276 // Keep thread alive for at least some time.
277 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
278
279 #if INCLUDE_JVMCI
280 if (compiler->is_jvmci()) {
281 // Handles for JVMCI thread objects may get released concurrently.
282 if (do_it) {
283 assert(CompileThread_lock->owner() == ct, "must be holding lock");
284 } else {
285 // Skip check if it's the last thread and let caller check again.
286 return true;
287 }
288 }
289 #endif
290
291 // We only allow the last compiler thread of each type to get removed.
292 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
293 : compiler2_object(compiler_count - 1);
294 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
295 if (do_it) {
296 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
297 compiler->set_num_compiler_threads(compiler_count - 1);
298 #if INCLUDE_JVMCI
299 if (compiler->is_jvmci()) {
300 // Old j.l.Thread object can die when no longer referenced elsewhere.
301 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
302 _compiler2_objects[compiler_count - 1] = nullptr;
303 }
304 #endif
305 }
306 return true;
307 }
308 return false;
309 }
310
311 /**
312 * Add a CompileTask to a CompileQueue.
313 */
314 void CompileQueue::add(CompileTask* task) {
315 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
316
317 task->set_next(nullptr);
318 task->set_prev(nullptr);
319
320 if (_last == nullptr) {
321 // The compile queue is empty.
322 assert(_first == nullptr, "queue is empty");
323 _first = task;
324 _last = task;
325 } else {
326 // Append the task to the queue.
327 assert(_last->next() == nullptr, "not last");
328 _last->set_next(task);
329 task->set_prev(_last);
330 _last = task;
331 }
332 ++_size;
333
334 // Mark the method as being in the compile queue.
335 task->method()->set_queued_for_compilation();
336
337 if (CIPrintCompileQueue) {
338 print_tty();
339 }
340
341 if (LogCompilation && xtty != nullptr) {
342 task->log_task_queued();
343 }
344
345 // Notify CompilerThreads that a task is available.
346 MethodCompileQueue_lock->notify_all();
347 }
348
349 /**
350 * Empties compilation queue by putting all compilation tasks onto
351 * a freelist. Furthermore, the method wakes up all threads that are
352 * waiting on a compilation task to finish. This can happen if background
353 * compilation is disabled.
354 */
355 void CompileQueue::free_all() {
356 MutexLocker mu(MethodCompileQueue_lock);
357 CompileTask* next = _first;
358
359 // Iterate over all tasks in the compile queue
360 while (next != nullptr) {
361 CompileTask* current = next;
362 next = current->next();
363 {
364 // Wake up thread that blocks on the compile task.
365 MutexLocker ct_lock(current->lock());
366 current->lock()->notify();
367 }
368 // Put the task back on the freelist.
369 CompileTask::free(current);
370 }
371 _first = nullptr;
372 _last = nullptr;
373
374 // Wake up all threads that block on the queue.
375 MethodCompileQueue_lock->notify_all();
376 }
377
378 /**
379 * Get the next CompileTask from a CompileQueue
380 */
381 CompileTask* CompileQueue::get(CompilerThread* thread) {
382 // save methods from RedefineClasses across safepoint
383 // across MethodCompileQueue_lock below.
384 methodHandle save_method;
385 methodHandle save_hot_method;
386
387 MonitorLocker locker(MethodCompileQueue_lock);
388 // If _first is null we have no more compile jobs. There are two reasons for
389 // having no compile jobs: First, we compiled everything we wanted. Second,
390 // we ran out of code cache so compilation has been disabled. In the latter
391 // case we perform code cache sweeps to free memory such that we can re-enable
392 // compilation.
393 while (_first == nullptr) {
394 // Exit loop if compilation is disabled forever
395 if (CompileBroker::is_compilation_disabled_forever()) {
396 return nullptr;
397 }
398
399 AbstractCompiler* compiler = thread->compiler();
400 guarantee(compiler != nullptr, "Compiler object must exist");
401 compiler->on_empty_queue(this, thread);
402 if (_first != nullptr) {
403 // The call to on_empty_queue may have temporarily unlocked the MCQ lock
404 // so check again whether any tasks were added to the queue.
405 break;
406 }
407
408 // If there are no compilation tasks and we can compile new jobs
409 // (i.e., there is enough free space in the code cache) there is
410 // no need to invoke the GC.
411 // We need a timed wait here, since compiler threads can exit if compilation
412 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
413 // is not critical and we do not want idle compiler threads to wake up too often.
414 locker.wait(5*1000);
415
416 if (UseDynamicNumberOfCompilerThreads && _first == nullptr) {
417 // Still nothing to compile. Give caller a chance to stop this thread.
418 if (CompileBroker::can_remove(CompilerThread::current(), false)) return nullptr;
419 }
420 }
421
422 if (CompileBroker::is_compilation_disabled_forever()) {
423 return nullptr;
424 }
425
426 CompileTask* task;
427 {
428 NoSafepointVerifier nsv;
429 task = CompilationPolicy::select_task(this);
430 if (task != nullptr) {
431 task = task->select_for_compilation();
432 }
433 }
434
435 if (task != nullptr) {
436 // Save method pointers across unlock safepoint. The task is removed from
437 // the compilation queue, which is walked during RedefineClasses.
438 Thread* thread = Thread::current();
439 save_method = methodHandle(thread, task->method());
440 save_hot_method = methodHandle(thread, task->hot_method());
441
442 remove(task);
443 }
444 purge_stale_tasks(); // may temporarily release MCQ lock
445 return task;
446 }
447
448 // Clean & deallocate stale compile tasks.
449 // Temporarily releases MethodCompileQueue lock.
450 void CompileQueue::purge_stale_tasks() {
451 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
452 if (_first_stale != nullptr) {
453 // Stale tasks are purged when MCQ lock is released,
454 // but _first_stale updates are protected by MCQ lock.
455 // Once task processing starts and MCQ lock is released,
456 // other compiler threads can reuse _first_stale.
457 CompileTask* head = _first_stale;
458 _first_stale = nullptr;
459 {
460 MutexUnlocker ul(MethodCompileQueue_lock);
461 for (CompileTask* task = head; task != nullptr; ) {
462 CompileTask* next_task = task->next();
463 CompileTaskWrapper ctw(task); // Frees the task
464 task->set_failure_reason("stale task");
465 task = next_task;
466 }
467 }
468 }
469 }
470
471 void CompileQueue::remove(CompileTask* task) {
472 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
473 if (task->prev() != nullptr) {
474 task->prev()->set_next(task->next());
475 } else {
476 // max is the first element
477 assert(task == _first, "Sanity");
478 _first = task->next();
479 }
480
481 if (task->next() != nullptr) {
482 task->next()->set_prev(task->prev());
483 } else {
484 // max is the last element
485 assert(task == _last, "Sanity");
486 _last = task->prev();
487 }
488 --_size;
489 }
490
491 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
492 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
493 remove(task);
494
495 // Enqueue the task for reclamation (should be done outside MCQ lock)
496 task->set_next(_first_stale);
497 task->set_prev(nullptr);
498 _first_stale = task;
499 }
500
501 // methods in the compile queue need to be marked as used on the stack
502 // so that they don't get reclaimed by Redefine Classes
503 void CompileQueue::mark_on_stack() {
504 CompileTask* task = _first;
505 while (task != nullptr) {
506 task->mark_on_stack();
507 task = task->next();
508 }
509 }
510
511
512 CompileQueue* CompileBroker::compile_queue(int comp_level) {
513 if (is_c2_compile(comp_level)) return _c2_compile_queue;
514 if (is_c1_compile(comp_level)) return _c1_compile_queue;
515 return nullptr;
516 }
517
518 void CompileBroker::print_compile_queues(outputStream* st) {
519 st->print_cr("Current compiles: ");
520
521 char buf[2000];
522 int buflen = sizeof(buf);
523 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
524
525 st->cr();
526 if (_c1_compile_queue != nullptr) {
527 _c1_compile_queue->print(st);
528 }
529 if (_c2_compile_queue != nullptr) {
530 _c2_compile_queue->print(st);
531 }
532 }
533
534 void CompileQueue::print(outputStream* st) {
535 assert_locked_or_safepoint(MethodCompileQueue_lock);
536 st->print_cr("%s:", name());
537 CompileTask* task = _first;
538 if (task == nullptr) {
539 st->print_cr("Empty");
540 } else {
541 while (task != nullptr) {
542 task->print(st, nullptr, true, true);
543 task = task->next();
544 }
545 }
546 st->cr();
547 }
548
549 void CompileQueue::print_tty() {
550 stringStream ss;
551 // Dump the compile queue into a buffer before locking the tty
552 print(&ss);
553 {
554 ttyLocker ttyl;
555 tty->print("%s", ss.freeze());
556 }
557 }
558
559 CompilerCounters::CompilerCounters() {
560 _current_method[0] = '\0';
561 _compile_type = CompileBroker::no_compile;
562 }
563
564 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
565 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
566 // in compiler/compilerEvent.cpp) and registers it with its serializer.
567 //
568 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
569 // so if c2 is used, it should be always registered first.
570 // This function is called during vm initialization.
571 void register_jfr_phasetype_serializer(CompilerType compiler_type) {
572 ResourceMark rm;
573 static bool first_registration = true;
574 if (compiler_type == compiler_jvmci) {
575 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
576 first_registration = false;
577 #ifdef COMPILER2
578 } else if (compiler_type == compiler_c2) {
579 assert(first_registration, "invariant"); // c2 must be registered first.
580 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
581 const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i);
582 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
583 }
584 first_registration = false;
585 #endif // COMPILER2
586 }
587 }
588 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
589
590 // ------------------------------------------------------------------
591 // CompileBroker::compilation_init
592 //
593 // Initialize the Compilation object
594 void CompileBroker::compilation_init_phase1(JavaThread* THREAD) {
595 // No need to initialize compilation system if we do not use it.
596 if (!UseCompiler) {
597 return;
598 }
599 // Set the interface to the current compiler(s).
600 _c1_count = CompilationPolicy::c1_count();
601 _c2_count = CompilationPolicy::c2_count();
602
603 #if INCLUDE_JVMCI
604 if (EnableJVMCI) {
605 // This is creating a JVMCICompiler singleton.
606 JVMCICompiler* jvmci = new JVMCICompiler();
607
608 if (UseJVMCICompiler) {
609 _compilers[1] = jvmci;
610 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
611 if (BootstrapJVMCI) {
612 // JVMCI will bootstrap so give it more threads
613 _c2_count = MIN2(32, os::active_processor_count());
614 }
615 } else {
616 _c2_count = JVMCIThreads;
617 }
618 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
619 } else {
620 #ifdef COMPILER1
621 _c1_count = JVMCIHostThreads;
622 #endif // COMPILER1
623 }
624 }
625 }
626 #endif // INCLUDE_JVMCI
627
628 #ifdef COMPILER1
629 if (_c1_count > 0) {
630 _compilers[0] = new Compiler();
631 }
632 #endif // COMPILER1
633
634 #ifdef COMPILER2
635 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
636 if (_c2_count > 0) {
637 _compilers[1] = new C2Compiler();
638 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
639 // idToPhase mapping for c2 is in opto/phasetype.hpp
640 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
641 }
642 }
643 #endif // COMPILER2
644
645 #if INCLUDE_JVMCI
646 // Register after c2 registration.
647 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
648 if (EnableJVMCI) {
649 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
650 }
651 #endif // INCLUDE_JVMCI
652
653 // Start the compiler thread(s)
654 init_compiler_threads();
655 // totalTime performance counter is always created as it is required
656 // by the implementation of java.lang.management.CompilationMXBean.
657 {
658 // Ensure OOM leads to vm_exit_during_initialization.
659 EXCEPTION_MARK;
660 _perf_total_compilation =
661 PerfDataManager::create_counter(JAVA_CI, "totalTime",
662 PerfData::U_Ticks, CHECK);
663 }
664
665 if (UsePerfData) {
666
667 EXCEPTION_MARK;
668
669 // create the jvmstat performance counters
670 _perf_osr_compilation =
671 PerfDataManager::create_counter(SUN_CI, "osrTime",
672 PerfData::U_Ticks, CHECK);
673
674 _perf_standard_compilation =
675 PerfDataManager::create_counter(SUN_CI, "standardTime",
676 PerfData::U_Ticks, CHECK);
677
678 _perf_total_bailout_count =
679 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
680 PerfData::U_Events, CHECK);
681
682 _perf_total_invalidated_count =
683 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
684 PerfData::U_Events, CHECK);
685
686 _perf_total_compile_count =
687 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
688 PerfData::U_Events, CHECK);
689 _perf_total_osr_compile_count =
690 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
691 PerfData::U_Events, CHECK);
692
693 _perf_total_standard_compile_count =
694 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
695 PerfData::U_Events, CHECK);
696
697 _perf_sum_osr_bytes_compiled =
698 PerfDataManager::create_counter(SUN_CI, "osrBytes",
699 PerfData::U_Bytes, CHECK);
700
701 _perf_sum_standard_bytes_compiled =
702 PerfDataManager::create_counter(SUN_CI, "standardBytes",
703 PerfData::U_Bytes, CHECK);
704
705 _perf_sum_nmethod_size =
706 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
707 PerfData::U_Bytes, CHECK);
708
709 _perf_sum_nmethod_code_size =
710 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
711 PerfData::U_Bytes, CHECK);
712
713 _perf_last_method =
714 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
715 CompilerCounters::cmname_buffer_length,
716 "", CHECK);
717
718 _perf_last_failed_method =
719 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
720 CompilerCounters::cmname_buffer_length,
721 "", CHECK);
722
723 _perf_last_invalidated_method =
724 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
725 CompilerCounters::cmname_buffer_length,
726 "", CHECK);
727
728 _perf_last_compile_type =
729 PerfDataManager::create_variable(SUN_CI, "lastType",
730 PerfData::U_None,
731 (jlong)CompileBroker::no_compile,
732 CHECK);
733
734 _perf_last_compile_size =
735 PerfDataManager::create_variable(SUN_CI, "lastSize",
736 PerfData::U_Bytes,
737 (jlong)CompileBroker::no_compile,
738 CHECK);
739
740
741 _perf_last_failed_type =
742 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
743 PerfData::U_None,
744 (jlong)CompileBroker::no_compile,
745 CHECK);
746
747 _perf_last_invalidated_type =
748 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
749 PerfData::U_None,
750 (jlong)CompileBroker::no_compile,
751 CHECK);
752 }
753 }
754
755 // Completes compiler initialization. Compilation requests submitted
756 // prior to this will be silently ignored.
757 void CompileBroker::compilation_init_phase2() {
758 _initialized = true;
759 }
760
761 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
762 Handle thread_oop = JavaThread::create_system_thread_object(name, CHECK_NH);
763 return thread_oop;
764 }
765
766 #if defined(ASSERT) && COMPILER2_OR_JVMCI
767 // Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to
768 // the running java application. Configured with vm options DeoptimizeObjectsALot*.
769 class DeoptimizeObjectsALotThread : public JavaThread {
770
771 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS);
772 void deoptimize_objects_alot_loop_single();
773 void deoptimize_objects_alot_loop_all();
774
775 public:
776 DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { }
777
778 bool is_hidden_from_external_view() const { return true; }
779 };
780
781 // Entry for DeoptimizeObjectsALotThread. The threads are started in
782 // CompileBroker::init_compiler_threads() iff DeoptimizeObjectsALot is enabled
783 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
784 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
785 bool enter_single_loop;
786 {
787 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
788 static int single_thread_count = 0;
789 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
790 }
791 if (enter_single_loop) {
792 dt->deoptimize_objects_alot_loop_single();
793 } else {
794 dt->deoptimize_objects_alot_loop_all();
795 }
796 }
797
798 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
799 // barrier targets a single thread which is selected round robin.
800 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
801 HandleMark hm(this);
802 while (true) {
803 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
804 { // Begin new scope for escape barrier
805 HandleMarkCleaner hmc(this);
806 ResourceMark rm(this);
807 EscapeBarrier eb(true, this, deoptee_thread);
808 eb.deoptimize_objects(100);
809 }
810 // Now sleep after the escape barriers destructor resumed deoptee_thread.
811 sleep(DeoptimizeObjectsALotInterval);
812 }
813 }
814 }
815
816 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
817 // barrier targets all java threads in the vm at once.
818 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
819 HandleMark hm(this);
820 while (true) {
821 { // Begin new scope for escape barrier
822 HandleMarkCleaner hmc(this);
823 ResourceMark rm(this);
824 EscapeBarrier eb(true, this);
825 eb.deoptimize_objects_all_threads();
826 }
827 // Now sleep after the escape barriers destructor resumed the java threads.
828 sleep(DeoptimizeObjectsALotInterval);
829 }
830 }
831 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
832
833
834 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
835 JavaThread* new_thread = nullptr;
836
837 switch (type) {
838 case compiler_t:
839 assert(comp != nullptr, "Compiler instance missing.");
840 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
841 CompilerCounters* counters = new CompilerCounters();
842 new_thread = new CompilerThread(queue, counters);
843 }
844 break;
845 #if defined(ASSERT) && COMPILER2_OR_JVMCI
846 case deoptimizer_t:
847 new_thread = new DeoptimizeObjectsALotThread();
848 break;
849 #endif // ASSERT
850 default:
851 ShouldNotReachHere();
852 }
853
854 // At this point the new CompilerThread data-races with this startup
855 // thread (which is the main thread and NOT the VM thread).
856 // This means Java bytecodes being executed at startup can
857 // queue compile jobs which will run at whatever default priority the
858 // newly created CompilerThread runs at.
859
860
861 // At this point it may be possible that no osthread was created for the
862 // JavaThread due to lack of resources. We will handle that failure below.
863 // Also check new_thread so that static analysis is happy.
864 if (new_thread != nullptr && new_thread->osthread() != nullptr) {
865 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
866
867 if (type == compiler_t) {
868 CompilerThread::cast(new_thread)->set_compiler(comp);
869 }
870
871 // Note that we cannot call os::set_priority because it expects Java
872 // priorities and we are *explicitly* using OS priorities so that it's
873 // possible to set the compiler thread priority higher than any Java
874 // thread.
875
876 int native_prio = CompilerThreadPriority;
877 if (native_prio == -1) {
878 if (UseCriticalCompilerThreadPriority) {
879 native_prio = os::java_to_os_priority[CriticalPriority];
880 } else {
881 native_prio = os::java_to_os_priority[NearMaxPriority];
882 }
883 }
884 os::set_native_priority(new_thread, native_prio);
885
886 // Note that this only sets the JavaThread _priority field, which by
887 // definition is limited to Java priorities and not OS priorities.
888 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
889
890 } else { // osthread initialization failure
891 if (UseDynamicNumberOfCompilerThreads && type == compiler_t
892 && comp->num_compiler_threads() > 0) {
893 // The new thread is not known to Thread-SMR yet so we can just delete.
894 delete new_thread;
895 return nullptr;
896 } else {
897 vm_exit_during_initialization("java.lang.OutOfMemoryError",
898 os::native_thread_creation_failed_msg());
899 }
900 }
901
902 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
903
904 return new_thread;
905 }
906
907 static bool trace_compiler_threads() {
908 LogTarget(Debug, jit, thread) lt;
909 return TraceCompilerThreads || lt.is_enabled();
910 }
911
912 static void print_compiler_threads(stringStream& msg) {
913 if (TraceCompilerThreads) {
914 tty->print_cr("%7d %s", (int)tty->time_stamp().milliseconds(), msg.as_string());
915 }
916 LogTarget(Debug, jit, thread) lt;
917 if (lt.is_enabled()) {
918 LogStream ls(lt);
919 ls.print_cr("%s", msg.as_string());
920 }
921 }
922
923 void CompileBroker::init_compiler_threads() {
924 // Ensure any exceptions lead to vm_exit_during_initialization.
925 EXCEPTION_MARK;
926 #if !defined(ZERO)
927 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
928 #endif // !ZERO
929 // Initialize the compilation queue
930 if (_c2_count > 0) {
931 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
932 _c2_compile_queue = new CompileQueue(name);
933 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
934 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
935 }
936 if (_c1_count > 0) {
937 _c1_compile_queue = new CompileQueue("C1 compile queue");
938 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
939 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
940 }
941
942 char name_buffer[256];
943
944 for (int i = 0; i < _c2_count; i++) {
945 jobject thread_handle = nullptr;
946 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
947 // for JVMCI compiler which can create further ones on demand.
948 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
949 // Create a name for our thread.
950 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i);
951 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
952 thread_handle = JNIHandles::make_global(thread_oop);
953 JVMCI_ONLY(})
954 _compiler2_objects[i] = thread_handle;
955 _compiler2_logs[i] = nullptr;
956
957 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
958 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
959 assert(ct != nullptr, "should have been handled for initial thread");
960 _compilers[1]->set_num_compiler_threads(i + 1);
961 if (trace_compiler_threads()) {
962 ResourceMark rm;
963 ThreadsListHandle tlh; // name() depends on the TLH.
964 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
965 stringStream msg;
966 msg.print("Added initial compiler thread %s", ct->name());
967 print_compiler_threads(msg);
968 }
969 }
970 }
971
972 for (int i = 0; i < _c1_count; i++) {
973 // Create a name for our thread.
974 os::snprintf_checked(name_buffer, sizeof(name_buffer), "C1 CompilerThread%d", i);
975 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
976 jobject thread_handle = JNIHandles::make_global(thread_oop);
977 _compiler1_objects[i] = thread_handle;
978 _compiler1_logs[i] = nullptr;
979
980 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
981 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
982 assert(ct != nullptr, "should have been handled for initial thread");
983 _compilers[0]->set_num_compiler_threads(i + 1);
984 if (trace_compiler_threads()) {
985 ResourceMark rm;
986 ThreadsListHandle tlh; // name() depends on the TLH.
987 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
988 stringStream msg;
989 msg.print("Added initial compiler thread %s", ct->name());
990 print_compiler_threads(msg);
991 }
992 }
993 }
994
995 if (UsePerfData) {
996 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
997 }
998
999 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1000 if (DeoptimizeObjectsALot) {
1001 // Initialize and start the object deoptimizer threads
1002 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1003 for (int count = 0; count < total_count; count++) {
1004 Handle thread_oop = create_thread_oop("Deoptimize objects a lot single mode", CHECK);
1005 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1006 make_thread(deoptimizer_t, thread_handle, nullptr, nullptr, THREAD);
1007 }
1008 }
1009 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1010 }
1011
1012 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
1013
1014 julong free_memory = os::free_memory();
1015 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1016 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1017 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1018
1019 // Only do attempt to start additional threads if the lock is free.
1020 if (!CompileThread_lock->try_lock()) return;
1021
1022 if (_c2_compile_queue != nullptr) {
1023 int old_c2_count = _compilers[1]->num_compiler_threads();
1024 int new_c2_count = MIN4(_c2_count,
1025 _c2_compile_queue->size() / 2,
1026 (int)(free_memory / (200*M)),
1027 (int)(available_cc_np / (128*K)));
1028
1029 for (int i = old_c2_count; i < new_c2_count; i++) {
1030 #if INCLUDE_JVMCI
1031 if (UseJVMCICompiler) {
1032 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
1033 // objects as their existence is completely hidden from the rest of
1034 // the VM (and those compiler threads can't call Java code to do the
1035 // creation anyway). For JVMCI we have to create new j.l.Thread objects
1036 // as they are visible and we can see unexpected thread lifecycle
1037 // transitions if we bind them to new JavaThreads.
1038 if (!THREAD->can_call_java()) break;
1039 char name_buffer[256];
1040 os::snprintf_checked(name_buffer, sizeof(name_buffer), "%s CompilerThread%d", _compilers[1]->name(), i);
1041 Handle thread_oop;
1042 {
1043 // We have to give up the lock temporarily for the Java calls.
1044 MutexUnlocker mu(CompileThread_lock);
1045 thread_oop = create_thread_oop(name_buffer, THREAD);
1046 }
1047 if (HAS_PENDING_EXCEPTION) {
1048 if (trace_compiler_threads()) {
1049 ResourceMark rm;
1050 stringStream msg;
1051 msg.print_cr("JVMCI compiler thread creation failed:");
1052 PENDING_EXCEPTION->print_on(&msg);
1053 print_compiler_threads(msg);
1054 }
1055 CLEAR_PENDING_EXCEPTION;
1056 break;
1057 }
1058 // Check if another thread has beaten us during the Java calls.
1059 if (_compilers[1]->num_compiler_threads() != i) break;
1060 jobject thread_handle = JNIHandles::make_global(thread_oop);
1061 assert(compiler2_object(i) == nullptr, "Old one must be released!");
1062 _compiler2_objects[i] = thread_handle;
1063 }
1064 #endif
1065 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1066 if (ct == nullptr) break;
1067 _compilers[1]->set_num_compiler_threads(i + 1);
1068 if (trace_compiler_threads()) {
1069 ResourceMark rm;
1070 ThreadsListHandle tlh; // name() depends on the TLH.
1071 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1072 stringStream msg;
1073 msg.print("Added compiler thread %s (free memory: %dMB, available non-profiled code cache: %dMB)",
1074 ct->name(), (int)(free_memory/M), (int)(available_cc_np/M));
1075 print_compiler_threads(msg);
1076 }
1077 }
1078 }
1079
1080 if (_c1_compile_queue != nullptr) {
1081 int old_c1_count = _compilers[0]->num_compiler_threads();
1082 int new_c1_count = MIN4(_c1_count,
1083 _c1_compile_queue->size() / 4,
1084 (int)(free_memory / (100*M)),
1085 (int)(available_cc_p / (128*K)));
1086
1087 for (int i = old_c1_count; i < new_c1_count; i++) {
1088 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1089 if (ct == nullptr) break;
1090 _compilers[0]->set_num_compiler_threads(i + 1);
1091 if (trace_compiler_threads()) {
1092 ResourceMark rm;
1093 ThreadsListHandle tlh; // name() depends on the TLH.
1094 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1095 stringStream msg;
1096 msg.print("Added compiler thread %s (free memory: %dMB, available profiled code cache: %dMB)",
1097 ct->name(), (int)(free_memory/M), (int)(available_cc_p/M));
1098 print_compiler_threads(msg);
1099 }
1100 }
1101 }
1102
1103 CompileThread_lock->unlock();
1104 }
1105
1106
1107 /**
1108 * Set the methods on the stack as on_stack so that redefine classes doesn't
1109 * reclaim them. This method is executed at a safepoint.
1110 */
1111 void CompileBroker::mark_on_stack() {
1112 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1113 // Since we are at a safepoint, we do not need a lock to access
1114 // the compile queues.
1115 if (_c2_compile_queue != nullptr) {
1116 _c2_compile_queue->mark_on_stack();
1117 }
1118 if (_c1_compile_queue != nullptr) {
1119 _c1_compile_queue->mark_on_stack();
1120 }
1121 }
1122
1123 // ------------------------------------------------------------------
1124 // CompileBroker::compile_method
1125 //
1126 // Request compilation of a method.
1127 void CompileBroker::compile_method_base(const methodHandle& method,
1128 int osr_bci,
1129 int comp_level,
1130 const methodHandle& hot_method,
1131 int hot_count,
1132 CompileTask::CompileReason compile_reason,
1133 bool blocking,
1134 Thread* thread) {
1135 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1136 assert(method->method_holder()->is_instance_klass(),
1137 "sanity check");
1138 assert(!method->method_holder()->is_not_initialized(),
1139 "method holder must be initialized");
1140 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1141
1142 if (CIPrintRequests) {
1143 tty->print("request: ");
1144 method->print_short_name(tty);
1145 if (osr_bci != InvocationEntryBci) {
1146 tty->print(" osr_bci: %d", osr_bci);
1147 }
1148 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1149 if (!hot_method.is_null()) {
1150 tty->print(" hot: ");
1151 if (hot_method() != method()) {
1152 hot_method->print_short_name(tty);
1153 } else {
1154 tty->print("yes");
1155 }
1156 }
1157 tty->cr();
1158 }
1159
1160 // A request has been made for compilation. Before we do any
1161 // real work, check to see if the method has been compiled
1162 // in the meantime with a definitive result.
1163 if (compilation_is_complete(method, osr_bci, comp_level)) {
1164 return;
1165 }
1166
1167 #ifndef PRODUCT
1168 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1169 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1170 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1171 return;
1172 }
1173 }
1174 #endif
1175
1176 // If this method is already in the compile queue, then
1177 // we do not block the current thread.
1178 if (compilation_is_in_queue(method)) {
1179 // We may want to decay our counter a bit here to prevent
1180 // multiple denied requests for compilation. This is an
1181 // open compilation policy issue. Note: The other possibility,
1182 // in the case that this is a blocking compile request, is to have
1183 // all subsequent blocking requesters wait for completion of
1184 // ongoing compiles. Note that in this case we'll need a protocol
1185 // for freeing the associated compile tasks. [Or we could have
1186 // a single static monitor on which all these waiters sleep.]
1187 return;
1188 }
1189
1190 // Tiered policy requires MethodCounters to exist before adding a method to
1191 // the queue. Create if we don't have them yet.
1192 method->get_method_counters(thread);
1193
1194 // Outputs from the following MutexLocker block:
1195 CompileTask* task = nullptr;
1196 CompileQueue* queue = compile_queue(comp_level);
1197
1198 // Acquire our lock.
1199 {
1200 MutexLocker locker(thread, MethodCompileQueue_lock);
1201
1202 // Make sure the method has not slipped into the queues since
1203 // last we checked; note that those checks were "fast bail-outs".
1204 // Here we need to be more careful, see 14012000 below.
1205 if (compilation_is_in_queue(method)) {
1206 return;
1207 }
1208
1209 // We need to check again to see if the compilation has
1210 // completed. A previous compilation may have registered
1211 // some result.
1212 if (compilation_is_complete(method, osr_bci, comp_level)) {
1213 return;
1214 }
1215
1216 // We now know that this compilation is not pending, complete,
1217 // or prohibited. Assign a compile_id to this compilation
1218 // and check to see if it is in our [Start..Stop) range.
1219 int compile_id = assign_compile_id(method, osr_bci);
1220 if (compile_id == 0) {
1221 // The compilation falls outside the allowed range.
1222 return;
1223 }
1224
1225 #if INCLUDE_JVMCI
1226 if (UseJVMCICompiler && blocking) {
1227 // Don't allow blocking compiles for requests triggered by JVMCI.
1228 if (thread->is_Compiler_thread()) {
1229 blocking = false;
1230 }
1231
1232 if (!UseJVMCINativeLibrary) {
1233 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1234 vframeStream vfst(JavaThread::cast(thread));
1235 for (; !vfst.at_end(); vfst.next()) {
1236 if (vfst.method()->is_class_initializer() ||
1237 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1238 vfst.method()->name() == vmSymbols::loadClass_name())) {
1239 blocking = false;
1240 break;
1241 }
1242 }
1243 }
1244
1245 // Don't allow blocking compilation requests to JVMCI
1246 // if JVMCI itself is not yet initialized
1247 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1248 blocking = false;
1249 }
1250
1251 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1252 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1253 // such as the DestroyJavaVM thread.
1254 if (JVMCI::in_shutdown()) {
1255 blocking = false;
1256 }
1257 }
1258 #endif // INCLUDE_JVMCI
1259
1260 // We will enter the compilation in the queue.
1261 // 14012000: Note that this sets the queued_for_compile bits in
1262 // the target method. We can now reason that a method cannot be
1263 // queued for compilation more than once, as follows:
1264 // Before a thread queues a task for compilation, it first acquires
1265 // the compile queue lock, then checks if the method's queued bits
1266 // are set or it has already been compiled. Thus there can not be two
1267 // instances of a compilation task for the same method on the
1268 // compilation queue. Consider now the case where the compilation
1269 // thread has already removed a task for that method from the queue
1270 // and is in the midst of compiling it. In this case, the
1271 // queued_for_compile bits must be set in the method (and these
1272 // will be visible to the current thread, since the bits were set
1273 // under protection of the compile queue lock, which we hold now.
1274 // When the compilation completes, the compiler thread first sets
1275 // the compilation result and then clears the queued_for_compile
1276 // bits. Neither of these actions are protected by a barrier (or done
1277 // under the protection of a lock), so the only guarantee we have
1278 // (on machines with TSO (Total Store Order)) is that these values
1279 // will update in that order. As a result, the only combinations of
1280 // these bits that the current thread will see are, in temporal order:
1281 // <RESULT, QUEUE> :
1282 // <0, 1> : in compile queue, but not yet compiled
1283 // <1, 1> : compiled but queue bit not cleared
1284 // <1, 0> : compiled and queue bit cleared
1285 // Because we first check the queue bits then check the result bits,
1286 // we are assured that we cannot introduce a duplicate task.
1287 // Note that if we did the tests in the reverse order (i.e. check
1288 // result then check queued bit), we could get the result bit before
1289 // the compilation completed, and the queue bit after the compilation
1290 // completed, and end up introducing a "duplicate" (redundant) task.
1291 // In that case, the compiler thread should first check if a method
1292 // has already been compiled before trying to compile it.
1293 // NOTE: in the event that there are multiple compiler threads and
1294 // there is de-optimization/recompilation, things will get hairy,
1295 // and in that case it's best to protect both the testing (here) of
1296 // these bits, and their updating (here and elsewhere) under a
1297 // common lock.
1298 task = create_compile_task(queue,
1299 compile_id, method,
1300 osr_bci, comp_level,
1301 hot_method, hot_count, compile_reason,
1302 blocking);
1303 }
1304
1305 if (blocking) {
1306 wait_for_completion(task);
1307 }
1308 }
1309
1310 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1311 int comp_level,
1312 const methodHandle& hot_method, int hot_count,
1313 CompileTask::CompileReason compile_reason,
1314 TRAPS) {
1315 // Do nothing if compilebroker is not initialized or compiles are submitted on level none
1316 if (!_initialized || comp_level == CompLevel_none) {
1317 return nullptr;
1318 }
1319
1320 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1321 assert(comp != nullptr, "Ensure we have a compiler");
1322
1323 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1324 // CompileBroker::compile_method can trap and can have pending async exception.
1325 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1326 DirectivesStack::release(directive);
1327 return nm;
1328 }
1329
1330 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1331 int comp_level,
1332 const methodHandle& hot_method, int hot_count,
1333 CompileTask::CompileReason compile_reason,
1334 DirectiveSet* directive,
1335 TRAPS) {
1336
1337 // make sure arguments make sense
1338 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1339 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1340 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1341 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1342 // return quickly if possible
1343
1344 // lock, make sure that the compilation
1345 // isn't prohibited in a straightforward way.
1346 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1347 if (comp == nullptr || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1348 return nullptr;
1349 }
1350
1351 #if INCLUDE_JVMCI
1352 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1353 return nullptr;
1354 }
1355 #endif
1356
1357 if (osr_bci == InvocationEntryBci) {
1358 // standard compilation
1359 CompiledMethod* method_code = method->code();
1360 if (method_code != nullptr && method_code->is_nmethod()) {
1361 if (compilation_is_complete(method, osr_bci, comp_level)) {
1362 return (nmethod*) method_code;
1363 }
1364 }
1365 if (method->is_not_compilable(comp_level)) {
1366 return nullptr;
1367 }
1368 } else {
1369 // osr compilation
1370 // We accept a higher level osr method
1371 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1372 if (nm != nullptr) return nm;
1373 if (method->is_not_osr_compilable(comp_level)) return nullptr;
1374 }
1375
1376 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1377 // some prerequisites that are compiler specific
1378 if (comp->is_c2() || comp->is_jvmci()) {
1379 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1380 // Resolve all classes seen in the signature of the method
1381 // we are compiling.
1382 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1383 }
1384
1385 // If the method is native, do the lookup in the thread requesting
1386 // the compilation. Native lookups can load code, which is not
1387 // permitted during compilation.
1388 //
1389 // Note: A native method implies non-osr compilation which is
1390 // checked with an assertion at the entry of this method.
1391 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1392 address adr = NativeLookup::lookup(method, THREAD);
1393 if (HAS_PENDING_EXCEPTION) {
1394 // In case of an exception looking up the method, we just forget
1395 // about it. The interpreter will kick-in and throw the exception.
1396 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1397 CLEAR_PENDING_EXCEPTION;
1398 return nullptr;
1399 }
1400 assert(method->has_native_function(), "must have native code by now");
1401 }
1402
1403 // RedefineClasses() has replaced this method; just return
1404 if (method->is_old()) {
1405 return nullptr;
1406 }
1407
1408 // JVMTI -- post_compile_event requires jmethod_id() that may require
1409 // a lock the compiling thread can not acquire. Prefetch it here.
1410 if (JvmtiExport::should_post_compiled_method_load()) {
1411 method->jmethod_id();
1412 }
1413
1414 // do the compilation
1415 if (method->is_native()) {
1416 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1417 #if defined(X86) && !defined(ZERO)
1418 // The following native methods:
1419 //
1420 // java.lang.Float.intBitsToFloat
1421 // java.lang.Float.floatToRawIntBits
1422 // java.lang.Double.longBitsToDouble
1423 // java.lang.Double.doubleToRawLongBits
1424 //
1425 // are called through the interpreter even if interpreter native stubs
1426 // are not preferred (i.e., calling through adapter handlers is preferred).
1427 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1428 // if the version of the methods from the native libraries is called.
1429 // As the interpreter and the C2-intrinsified version of the methods preserves
1430 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1431 if ((UseSSE >= 1 &&
1432 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1433 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1434 (UseSSE >= 2 &&
1435 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1436 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1437 return nullptr;
1438 }
1439 #endif // X86 && !ZERO
1440
1441 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1442 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1443 //
1444 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1445 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1446 AdapterHandlerLibrary::create_native_wrapper(method);
1447 } else {
1448 return nullptr;
1449 }
1450 } else {
1451 // If the compiler is shut off due to code cache getting full
1452 // fail out now so blocking compiles dont hang the java thread
1453 if (!should_compile_new_jobs()) {
1454 return nullptr;
1455 }
1456 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1457 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1458 }
1459
1460 // return requested nmethod
1461 // We accept a higher level osr method
1462 if (osr_bci == InvocationEntryBci) {
1463 CompiledMethod* code = method->code();
1464 if (code == nullptr) {
1465 return (nmethod*) code;
1466 } else {
1467 return code->as_nmethod_or_null();
1468 }
1469 }
1470 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1471 }
1472
1473
1474 // ------------------------------------------------------------------
1475 // CompileBroker::compilation_is_complete
1476 //
1477 // See if compilation of this method is already complete.
1478 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1479 int osr_bci,
1480 int comp_level) {
1481 bool is_osr = (osr_bci != standard_entry_bci);
1482 if (is_osr) {
1483 if (method->is_not_osr_compilable(comp_level)) {
1484 return true;
1485 } else {
1486 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1487 return (result != nullptr);
1488 }
1489 } else {
1490 if (method->is_not_compilable(comp_level)) {
1491 return true;
1492 } else {
1493 CompiledMethod* result = method->code();
1494 if (result == nullptr) return false;
1495 return comp_level == result->comp_level();
1496 }
1497 }
1498 }
1499
1500
1501 /**
1502 * See if this compilation is already requested.
1503 *
1504 * Implementation note: there is only a single "is in queue" bit
1505 * for each method. This means that the check below is overly
1506 * conservative in the sense that an osr compilation in the queue
1507 * will block a normal compilation from entering the queue (and vice
1508 * versa). This can be remedied by a full queue search to disambiguate
1509 * cases. If it is deemed profitable, this may be done.
1510 */
1511 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1512 return method->queued_for_compilation();
1513 }
1514
1515 // ------------------------------------------------------------------
1516 // CompileBroker::compilation_is_prohibited
1517 //
1518 // See if this compilation is not allowed.
1519 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1520 bool is_native = method->is_native();
1521 // Some compilers may not support the compilation of natives.
1522 AbstractCompiler *comp = compiler(comp_level);
1523 if (is_native && (!CICompileNatives || comp == nullptr)) {
1524 method->set_not_compilable_quietly("native methods not supported", comp_level);
1525 return true;
1526 }
1527
1528 bool is_osr = (osr_bci != standard_entry_bci);
1529 // Some compilers may not support on stack replacement.
1530 if (is_osr && (!CICompileOSR || comp == nullptr)) {
1531 method->set_not_osr_compilable("OSR not supported", comp_level);
1532 return true;
1533 }
1534
1535 // The method may be explicitly excluded by the user.
1536 double scale;
1537 if (excluded || (CompilerOracle::has_option_value(method, CompileCommand::CompileThresholdScaling, scale) && scale == 0)) {
1538 bool quietly = CompilerOracle::be_quiet();
1539 if (PrintCompilation && !quietly) {
1540 // This does not happen quietly...
1541 ResourceMark rm;
1542 tty->print("### Excluding %s:%s",
1543 method->is_native() ? "generation of native wrapper" : "compile",
1544 (method->is_static() ? " static" : ""));
1545 method->print_short_name(tty);
1546 tty->cr();
1547 }
1548 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1549 }
1550
1551 return false;
1552 }
1553
1554 /**
1555 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1556 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1557 * The function also allows to generate separate compilation IDs for OSR compilations.
1558 */
1559 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1560 #ifdef ASSERT
1561 bool is_osr = (osr_bci != standard_entry_bci);
1562 int id;
1563 if (method->is_native()) {
1564 assert(!is_osr, "can't be osr");
1565 // Adapters, native wrappers and method handle intrinsics
1566 // should be generated always.
1567 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1568 } else if (CICountOSR && is_osr) {
1569 id = Atomic::add(&_osr_compilation_id, 1);
1570 if (CIStartOSR <= id && id < CIStopOSR) {
1571 return id;
1572 }
1573 } else {
1574 id = Atomic::add(&_compilation_id, 1);
1575 if (CIStart <= id && id < CIStop) {
1576 return id;
1577 }
1578 }
1579
1580 // Method was not in the appropriate compilation range.
1581 method->set_not_compilable_quietly("Not in requested compile id range");
1582 return 0;
1583 #else
1584 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1585 // only _compilation_id is incremented.
1586 return Atomic::add(&_compilation_id, 1);
1587 #endif
1588 }
1589
1590 // ------------------------------------------------------------------
1591 // CompileBroker::assign_compile_id_unlocked
1592 //
1593 // Public wrapper for assign_compile_id that acquires the needed locks
1594 int CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1595 MutexLocker locker(thread, MethodCompileQueue_lock);
1596 return assign_compile_id(method, osr_bci);
1597 }
1598
1599 // ------------------------------------------------------------------
1600 // CompileBroker::create_compile_task
1601 //
1602 // Create a CompileTask object representing the current request for
1603 // compilation. Add this task to the queue.
1604 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1605 int compile_id,
1606 const methodHandle& method,
1607 int osr_bci,
1608 int comp_level,
1609 const methodHandle& hot_method,
1610 int hot_count,
1611 CompileTask::CompileReason compile_reason,
1612 bool blocking) {
1613 CompileTask* new_task = CompileTask::allocate();
1614 new_task->initialize(compile_id, method, osr_bci, comp_level,
1615 hot_method, hot_count, compile_reason,
1616 blocking);
1617 queue->add(new_task);
1618 return new_task;
1619 }
1620
1621 #if INCLUDE_JVMCI
1622 // The number of milliseconds to wait before checking if
1623 // JVMCI compilation has made progress.
1624 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1625
1626 // The number of JVMCI compilation progress checks that must fail
1627 // before unblocking a thread waiting for a blocking compilation.
1628 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1629
1630 /**
1631 * Waits for a JVMCI compiler to complete a given task. This thread
1632 * waits until either the task completes or it sees no JVMCI compilation
1633 * progress for N consecutive milliseconds where N is
1634 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1635 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1636 *
1637 * @return true if this thread needs to free/recycle the task
1638 */
1639 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1640 assert(UseJVMCICompiler, "sanity");
1641 MonitorLocker ml(thread, task->lock());
1642 int progress_wait_attempts = 0;
1643 jint thread_jvmci_compilation_ticks = 0;
1644 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1645 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1646 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1647 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1648
1649 bool progress;
1650 if (jvmci_compile_state != nullptr) {
1651 jint ticks = jvmci_compile_state->compilation_ticks();
1652 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1653 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1654 thread_jvmci_compilation_ticks = ticks;
1655 } else {
1656 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1657 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1658 // compilation ticks to determine whether JVMCI compilation
1659 // is still making progress through the JVMCI compiler queue.
1660 jint ticks = jvmci->global_compilation_ticks();
1661 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1662 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1663 global_jvmci_compilation_ticks = ticks;
1664 }
1665
1666 if (!progress) {
1667 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1668 if (PrintCompilation) {
1669 task->print(tty, "wait for blocking compilation timed out");
1670 }
1671 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1672 break;
1673 }
1674 } else {
1675 progress_wait_attempts = 0;
1676 }
1677 }
1678 task->clear_waiter();
1679 return task->is_complete();
1680 }
1681 #endif
1682
1683 /**
1684 * Wait for the compilation task to complete.
1685 */
1686 void CompileBroker::wait_for_completion(CompileTask* task) {
1687 if (CIPrintCompileQueue) {
1688 ttyLocker ttyl;
1689 tty->print_cr("BLOCKING FOR COMPILE");
1690 }
1691
1692 assert(task->is_blocking(), "can only wait on blocking task");
1693
1694 JavaThread* thread = JavaThread::current();
1695
1696 methodHandle method(thread, task->method());
1697 bool free_task;
1698 #if INCLUDE_JVMCI
1699 AbstractCompiler* comp = compiler(task->comp_level());
1700 if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
1701 // It may return before compilation is completed.
1702 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1703 } else
1704 #endif
1705 {
1706 MonitorLocker ml(thread, task->lock());
1707 free_task = true;
1708 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1709 ml.wait();
1710 }
1711 }
1712
1713 if (free_task) {
1714 if (is_compilation_disabled_forever()) {
1715 CompileTask::free(task);
1716 return;
1717 }
1718
1719 // It is harmless to check this status without the lock, because
1720 // completion is a stable property (until the task object is recycled).
1721 assert(task->is_complete(), "Compilation should have completed");
1722
1723 // By convention, the waiter is responsible for recycling a
1724 // blocking CompileTask. Since there is only one waiter ever
1725 // waiting on a CompileTask, we know that no one else will
1726 // be using this CompileTask; we can free it.
1727 CompileTask::free(task);
1728 }
1729 }
1730
1731 /**
1732 * Initialize compiler thread(s) + compiler object(s). The postcondition
1733 * of this function is that the compiler runtimes are initialized and that
1734 * compiler threads can start compiling.
1735 */
1736 bool CompileBroker::init_compiler_runtime() {
1737 CompilerThread* thread = CompilerThread::current();
1738 AbstractCompiler* comp = thread->compiler();
1739 // Final sanity check - the compiler object must exist
1740 guarantee(comp != nullptr, "Compiler object must exist");
1741
1742 {
1743 // Must switch to native to allocate ci_env
1744 ThreadToNativeFromVM ttn(thread);
1745 ciEnv ci_env((CompileTask*)nullptr);
1746 // Cache Jvmti state
1747 ci_env.cache_jvmti_state();
1748 // Cache DTrace flags
1749 ci_env.cache_dtrace_flags();
1750
1751 // Switch back to VM state to do compiler initialization
1752 ThreadInVMfromNative tv(thread);
1753
1754 // Perform per-thread and global initializations
1755 comp->initialize();
1756 }
1757
1758 if (comp->is_failed()) {
1759 disable_compilation_forever();
1760 // If compiler initialization failed, no compiler thread that is specific to a
1761 // particular compiler runtime will ever start to compile methods.
1762 shutdown_compiler_runtime(comp, thread);
1763 return false;
1764 }
1765
1766 // C1 specific check
1767 if (comp->is_c1() && (thread->get_buffer_blob() == nullptr)) {
1768 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1769 return false;
1770 }
1771
1772 return true;
1773 }
1774
1775 /**
1776 * If C1 and/or C2 initialization failed, we shut down all compilation.
1777 * We do this to keep things simple. This can be changed if it ever turns
1778 * out to be a problem.
1779 */
1780 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1781 // Free buffer blob, if allocated
1782 if (thread->get_buffer_blob() != nullptr) {
1783 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1784 CodeCache::free(thread->get_buffer_blob());
1785 }
1786
1787 if (comp->should_perform_shutdown()) {
1788 // There are two reasons for shutting down the compiler
1789 // 1) compiler runtime initialization failed
1790 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1791 warning("%s initialization failed. Shutting down all compilers", comp->name());
1792
1793 // Only one thread per compiler runtime object enters here
1794 // Set state to shut down
1795 comp->set_shut_down();
1796
1797 // Delete all queued compilation tasks to make compiler threads exit faster.
1798 if (_c1_compile_queue != nullptr) {
1799 _c1_compile_queue->free_all();
1800 }
1801
1802 if (_c2_compile_queue != nullptr) {
1803 _c2_compile_queue->free_all();
1804 }
1805
1806 // Set flags so that we continue execution with using interpreter only.
1807 UseCompiler = false;
1808 UseInterpreter = true;
1809
1810 // We could delete compiler runtimes also. However, there are references to
1811 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1812 // fail. This can be done later if necessary.
1813 }
1814 }
1815
1816 /**
1817 * Helper function to create new or reuse old CompileLog.
1818 */
1819 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1820 if (!LogCompilation) return nullptr;
1821
1822 AbstractCompiler *compiler = ct->compiler();
1823 bool c1 = compiler->is_c1();
1824 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1825 assert(compiler_objects != nullptr, "must be initialized at this point");
1826 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1827 assert(logs != nullptr, "must be initialized at this point");
1828 int count = c1 ? _c1_count : _c2_count;
1829
1830 // Find Compiler number by its threadObj.
1831 oop compiler_obj = ct->threadObj();
1832 int compiler_number = 0;
1833 bool found = false;
1834 for (; compiler_number < count; compiler_number++) {
1835 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1836 found = true;
1837 break;
1838 }
1839 }
1840 assert(found, "Compiler must exist at this point");
1841
1842 // Determine pointer for this thread's log.
1843 CompileLog** log_ptr = &logs[compiler_number];
1844
1845 // Return old one if it exists.
1846 CompileLog* log = *log_ptr;
1847 if (log != nullptr) {
1848 ct->init_log(log);
1849 return log;
1850 }
1851
1852 // Create a new one and remember it.
1853 init_compiler_thread_log();
1854 log = ct->log();
1855 *log_ptr = log;
1856 return log;
1857 }
1858
1859 // ------------------------------------------------------------------
1860 // CompileBroker::compiler_thread_loop
1861 //
1862 // The main loop run by a CompilerThread.
1863 void CompileBroker::compiler_thread_loop() {
1864 CompilerThread* thread = CompilerThread::current();
1865 CompileQueue* queue = thread->queue();
1866 // For the thread that initializes the ciObjectFactory
1867 // this resource mark holds all the shared objects
1868 ResourceMark rm;
1869
1870 // First thread to get here will initialize the compiler interface
1871
1872 {
1873 ASSERT_IN_VM;
1874 MutexLocker only_one (thread, CompileThread_lock);
1875 if (!ciObjectFactory::is_initialized()) {
1876 ciObjectFactory::initialize();
1877 }
1878 }
1879
1880 // Open a log.
1881 CompileLog* log = get_log(thread);
1882 if (log != nullptr) {
1883 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1884 thread->name(),
1885 os::current_thread_id(),
1886 os::current_process_id());
1887 log->stamp();
1888 log->end_elem();
1889 }
1890
1891 // If compiler thread/runtime initialization fails, exit the compiler thread
1892 if (!init_compiler_runtime()) {
1893 return;
1894 }
1895
1896 thread->start_idle_timer();
1897
1898 // Poll for new compilation tasks as long as the JVM runs. Compilation
1899 // should only be disabled if something went wrong while initializing the
1900 // compiler runtimes. This, in turn, should not happen. The only known case
1901 // when compiler runtime initialization fails is if there is not enough free
1902 // space in the code cache to generate the necessary stubs, etc.
1903 while (!is_compilation_disabled_forever()) {
1904 // We need this HandleMark to avoid leaking VM handles.
1905 HandleMark hm(thread);
1906
1907 CompileTask* task = queue->get(thread);
1908 if (task == nullptr) {
1909 if (UseDynamicNumberOfCompilerThreads) {
1910 // Access compiler_count under lock to enforce consistency.
1911 MutexLocker only_one(CompileThread_lock);
1912 if (can_remove(thread, true)) {
1913 if (trace_compiler_threads()) {
1914 ResourceMark rm;
1915 stringStream msg;
1916 msg.print("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1917 thread->name(), thread->idle_time_millis());
1918 print_compiler_threads(msg);
1919 }
1920
1921 // Notify compiler that the compiler thread is about to stop
1922 thread->compiler()->stopping_compiler_thread(thread);
1923
1924 // Free buffer blob, if allocated
1925 if (thread->get_buffer_blob() != nullptr) {
1926 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1927 CodeCache::free(thread->get_buffer_blob());
1928 }
1929 return; // Stop this thread.
1930 }
1931 }
1932 } else {
1933 // Assign the task to the current thread. Mark this compilation
1934 // thread as active for the profiler.
1935 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1936 // occurs after fetching the compile task off the queue.
1937 CompileTaskWrapper ctw(task);
1938 methodHandle method(thread, task->method());
1939
1940 // Never compile a method if breakpoints are present in it
1941 if (method()->number_of_breakpoints() == 0) {
1942 // Compile the method.
1943 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1944 invoke_compiler_on_method(task);
1945 thread->start_idle_timer();
1946 } else {
1947 // After compilation is disabled, remove remaining methods from queue
1948 method->clear_queued_for_compilation();
1949 task->set_failure_reason("compilation is disabled");
1950 }
1951 } else {
1952 task->set_failure_reason("breakpoints are present");
1953 }
1954
1955 if (UseDynamicNumberOfCompilerThreads) {
1956 possibly_add_compiler_threads(thread);
1957 assert(!thread->has_pending_exception(), "should have been handled");
1958 }
1959 }
1960 }
1961
1962 // Shut down compiler runtime
1963 shutdown_compiler_runtime(thread->compiler(), thread);
1964 }
1965
1966 // ------------------------------------------------------------------
1967 // CompileBroker::init_compiler_thread_log
1968 //
1969 // Set up state required by +LogCompilation.
1970 void CompileBroker::init_compiler_thread_log() {
1971 CompilerThread* thread = CompilerThread::current();
1972 char file_name[4*K];
1973 FILE* fp = nullptr;
1974 intx thread_id = os::current_thread_id();
1975 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1976 const char* dir = (try_temp_dir ? os::get_temp_directory() : nullptr);
1977 if (dir == nullptr) {
1978 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1979 thread_id, os::current_process_id());
1980 } else {
1981 jio_snprintf(file_name, sizeof(file_name),
1982 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1983 os::file_separator(), thread_id, os::current_process_id());
1984 }
1985
1986 fp = os::fopen(file_name, "wt");
1987 if (fp != nullptr) {
1988 if (LogCompilation && Verbose) {
1989 tty->print_cr("Opening compilation log %s", file_name);
1990 }
1991 CompileLog* log = new(mtCompiler) CompileLog(file_name, fp, thread_id);
1992 if (log == nullptr) {
1993 fclose(fp);
1994 return;
1995 }
1996 thread->init_log(log);
1997
1998 if (xtty != nullptr) {
1999 ttyLocker ttyl;
2000 // Record any per thread log files
2001 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2002 }
2003 return;
2004 }
2005 }
2006 warning("Cannot open log file: %s", file_name);
2007 }
2008
2009 void CompileBroker::log_metaspace_failure() {
2010 const char* message = "some methods may not be compiled because metaspace "
2011 "is out of memory";
2012 if (CompilationLog::log() != nullptr) {
2013 CompilationLog::log()->log_metaspace_failure(message);
2014 }
2015 if (PrintCompilation) {
2016 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2017 }
2018 }
2019
2020
2021 // ------------------------------------------------------------------
2022 // CompileBroker::set_should_block
2023 //
2024 // Set _should_block.
2025 // Call this from the VM, with Threads_lock held and a safepoint requested.
2026 void CompileBroker::set_should_block() {
2027 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2028 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2029 #ifndef PRODUCT
2030 if (PrintCompilation && (Verbose || WizardMode))
2031 tty->print_cr("notifying compiler thread pool to block");
2032 #endif
2033 _should_block = true;
2034 }
2035
2036 // ------------------------------------------------------------------
2037 // CompileBroker::maybe_block
2038 //
2039 // Call this from the compiler at convenient points, to poll for _should_block.
2040 void CompileBroker::maybe_block() {
2041 if (_should_block) {
2042 #ifndef PRODUCT
2043 if (PrintCompilation && (Verbose || WizardMode))
2044 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2045 #endif
2046 ThreadInVMfromNative tivfn(JavaThread::current());
2047 }
2048 }
2049
2050 // wrapper for CodeCache::print_summary()
2051 static void codecache_print(bool detailed)
2052 {
2053 stringStream s;
2054 // Dump code cache into a buffer before locking the tty,
2055 {
2056 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2057 CodeCache::print_summary(&s, detailed);
2058 }
2059 ttyLocker ttyl;
2060 tty->print("%s", s.freeze());
2061 }
2062
2063 // wrapper for CodeCache::print_summary() using outputStream
2064 static void codecache_print(outputStream* out, bool detailed) {
2065 stringStream s;
2066
2067 // Dump code cache into a buffer
2068 {
2069 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2070 CodeCache::print_summary(&s, detailed);
2071 }
2072
2073 char* remaining_log = s.as_string();
2074 while (*remaining_log != '\0') {
2075 char* eol = strchr(remaining_log, '\n');
2076 if (eol == nullptr) {
2077 out->print_cr("%s", remaining_log);
2078 remaining_log = remaining_log + strlen(remaining_log);
2079 } else {
2080 *eol = '\0';
2081 out->print_cr("%s", remaining_log);
2082 remaining_log = eol + 1;
2083 }
2084 }
2085 }
2086
2087 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env,
2088 int compilable, const char* failure_reason) {
2089 if (!AbortVMOnCompilationFailure) {
2090 return;
2091 }
2092 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2093 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2094 }
2095 if (compilable == ciEnv::MethodCompilable_never) {
2096 fatal("Never compilable: %s", failure_reason);
2097 }
2098 }
2099
2100 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2101 assert(task != nullptr, "invariant");
2102 CompilerEvent::CompilationEvent::post(event,
2103 task->compile_id(),
2104 task->compiler()->type(),
2105 task->method(),
2106 task->comp_level(),
2107 task->is_success(),
2108 task->osr_bci() != CompileBroker::standard_entry_bci,
2109 task->nm_total_size(),
2110 task->num_inlined_bytecodes());
2111 }
2112
2113 int DirectivesStack::_depth = 0;
2114 CompilerDirectives* DirectivesStack::_top = nullptr;
2115 CompilerDirectives* DirectivesStack::_bottom = nullptr;
2116
2117 // Acquires Compilation_lock and waits for it to be notified
2118 // as long as WhiteBox::compilation_locked is true.
2119 static void whitebox_lock_compilation() {
2120 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2121 while (WhiteBox::compilation_locked) {
2122 locker.wait();
2123 }
2124 }
2125
2126 // ------------------------------------------------------------------
2127 // CompileBroker::invoke_compiler_on_method
2128 //
2129 // Compile a method.
2130 //
2131 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2132 task->print_ul();
2133 elapsedTimer time;
2134
2135 DirectiveSet* directive = task->directive();
2136 if (directive->PrintCompilationOption) {
2137 ResourceMark rm;
2138 task->print_tty();
2139 }
2140
2141 CompilerThread* thread = CompilerThread::current();
2142 ResourceMark rm(thread);
2143
2144 if (CompilationLog::log() != nullptr) {
2145 CompilationLog::log()->log_compile(thread, task);
2146 }
2147
2148 // Common flags.
2149 int compile_id = task->compile_id();
2150 int osr_bci = task->osr_bci();
2151 bool is_osr = (osr_bci != standard_entry_bci);
2152 bool should_log = (thread->log() != nullptr);
2153 bool should_break = false;
2154 const int task_level = task->comp_level();
2155 AbstractCompiler* comp = task->compiler();
2156 {
2157 // create the handle inside it's own block so it can't
2158 // accidentally be referenced once the thread transitions to
2159 // native. The NoHandleMark before the transition should catch
2160 // any cases where this occurs in the future.
2161 methodHandle method(thread, task->method());
2162
2163 assert(!method->is_native(), "no longer compile natives");
2164
2165 // Update compile information when using perfdata.
2166 if (UsePerfData) {
2167 update_compile_perf_data(thread, method, is_osr);
2168 }
2169
2170 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2171 }
2172
2173 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2174 if (should_log && !directive->LogOption) {
2175 should_log = false;
2176 }
2177
2178 // Allocate a new set of JNI handles.
2179 JNIHandleMark jhm(thread);
2180 Method* target_handle = task->method();
2181 int compilable = ciEnv::MethodCompilable;
2182 const char* failure_reason = nullptr;
2183 bool failure_reason_on_C_heap = false;
2184 const char* retry_message = nullptr;
2185
2186 #if INCLUDE_JVMCI
2187 if (UseJVMCICompiler && comp != nullptr && comp->is_jvmci()) {
2188 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2189
2190 TraceTime t1("compilation", &time);
2191 EventCompilation event;
2192 JVMCICompileState compile_state(task, jvmci);
2193 JVMCIRuntime *runtime = nullptr;
2194
2195 if (JVMCI::in_shutdown()) {
2196 failure_reason = "in JVMCI shutdown";
2197 retry_message = "not retryable";
2198 compilable = ciEnv::MethodCompilable_never;
2199 } else if (compile_state.target_method_is_old()) {
2200 // Skip redefined methods
2201 failure_reason = "redefined method";
2202 retry_message = "not retryable";
2203 compilable = ciEnv::MethodCompilable_never;
2204 } else {
2205 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2206 failure_reason = compile_state.failure_reason();
2207 if (failure_reason == nullptr) {
2208 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2209 // Must switch to native to block
2210 ThreadToNativeFromVM ttn(thread);
2211 whitebox_lock_compilation();
2212 }
2213 methodHandle method(thread, target_handle);
2214 runtime = env.runtime();
2215 runtime->compile_method(&env, jvmci, method, osr_bci);
2216
2217 failure_reason = compile_state.failure_reason();
2218 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2219 if (!compile_state.retryable()) {
2220 retry_message = "not retryable";
2221 compilable = ciEnv::MethodCompilable_not_at_tier;
2222 }
2223 if (!task->is_success()) {
2224 assert(failure_reason != nullptr, "must specify failure_reason");
2225 }
2226 }
2227 }
2228 if (!task->is_success()) {
2229 handle_compile_error(thread, task, nullptr, compilable, failure_reason);
2230 }
2231 if (event.should_commit()) {
2232 post_compilation_event(event, task);
2233 }
2234
2235 if (runtime != nullptr) {
2236 runtime->post_compile(thread);
2237 }
2238 } else
2239 #endif // INCLUDE_JVMCI
2240 {
2241 NoHandleMark nhm;
2242 ThreadToNativeFromVM ttn(thread);
2243
2244 ciEnv ci_env(task);
2245 if (should_break) {
2246 ci_env.set_break_at_compile(true);
2247 }
2248 if (should_log) {
2249 ci_env.set_log(thread->log());
2250 }
2251 assert(thread->env() == &ci_env, "set by ci_env");
2252 // The thread-env() field is cleared in ~CompileTaskWrapper.
2253
2254 // Cache Jvmti state
2255 bool method_is_old = ci_env.cache_jvmti_state();
2256
2257 // Skip redefined methods
2258 if (method_is_old) {
2259 ci_env.record_method_not_compilable("redefined method", true);
2260 }
2261
2262 // Cache DTrace flags
2263 ci_env.cache_dtrace_flags();
2264
2265 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2266
2267 TraceTime t1("compilation", &time);
2268 EventCompilation event;
2269
2270 if (comp == nullptr) {
2271 ci_env.record_method_not_compilable("no compiler");
2272 } else if (!ci_env.failing()) {
2273 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2274 whitebox_lock_compilation();
2275 }
2276 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2277
2278 /* Repeat compilation without installing code for profiling purposes */
2279 int repeat_compilation_count = directive->RepeatCompilationOption;
2280 while (repeat_compilation_count > 0) {
2281 ResourceMark rm(thread);
2282 task->print_ul("NO CODE INSTALLED");
2283 comp->compile_method(&ci_env, target, osr_bci, false, directive);
2284 repeat_compilation_count--;
2285 }
2286 }
2287
2288 DirectivesStack::release(directive);
2289
2290 if (!ci_env.failing() && !task->is_success()) {
2291 assert(ci_env.failure_reason() != nullptr, "expect failure reason");
2292 assert(false, "compiler should always document failure: %s", ci_env.failure_reason());
2293 // The compiler elected, without comment, not to register a result.
2294 // Do not attempt further compilations of this method.
2295 ci_env.record_method_not_compilable("compile failed");
2296 }
2297
2298 // Copy this bit to the enclosing block:
2299 compilable = ci_env.compilable();
2300
2301 if (ci_env.failing()) {
2302 failure_reason = ci_env.failure_reason();
2303 retry_message = ci_env.retry_message();
2304 ci_env.report_failure(failure_reason);
2305 }
2306
2307 if (ci_env.failing()) {
2308 handle_compile_error(thread, task, &ci_env, compilable, failure_reason);
2309 }
2310 if (event.should_commit()) {
2311 post_compilation_event(event, task);
2312 }
2313 }
2314
2315 if (failure_reason != nullptr) {
2316 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2317 if (CompilationLog::log() != nullptr) {
2318 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message);
2319 }
2320 if (PrintCompilation) {
2321 FormatBufferResource msg = retry_message != nullptr ?
2322 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2323 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2324 task->print(tty, msg);
2325 }
2326 }
2327
2328 methodHandle method(thread, task->method());
2329
2330 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2331
2332 collect_statistics(thread, time, task);
2333
2334 if (PrintCompilation && PrintCompilation2) {
2335 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2336 tty->print("%4d ", compile_id); // print compilation number
2337 tty->print("%s ", (is_osr ? "%" : " "));
2338 if (task->is_success()) {
2339 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size());
2340 }
2341 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2342 }
2343
2344 Log(compilation, codecache) log;
2345 if (log.is_debug()) {
2346 LogStream ls(log.debug());
2347 codecache_print(&ls, /* detailed= */ false);
2348 }
2349 if (PrintCodeCacheOnCompilation) {
2350 codecache_print(/* detailed= */ false);
2351 }
2352 // Disable compilation, if required.
2353 switch (compilable) {
2354 case ciEnv::MethodCompilable_never:
2355 if (is_osr)
2356 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2357 else
2358 method->set_not_compilable_quietly("MethodCompilable_never");
2359 break;
2360 case ciEnv::MethodCompilable_not_at_tier:
2361 if (is_osr)
2362 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2363 else
2364 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2365 break;
2366 }
2367
2368 // Note that the queued_for_compilation bits are cleared without
2369 // protection of a mutex. [They were set by the requester thread,
2370 // when adding the task to the compile queue -- at which time the
2371 // compile queue lock was held. Subsequently, we acquired the compile
2372 // queue lock to get this task off the compile queue; thus (to belabour
2373 // the point somewhat) our clearing of the bits must be occurring
2374 // only after the setting of the bits. See also 14012000 above.
2375 method->clear_queued_for_compilation();
2376 }
2377
2378 /**
2379 * The CodeCache is full. Print warning and disable compilation.
2380 * Schedule code cache cleaning so compilation can continue later.
2381 * This function needs to be called only from CodeCache::allocate(),
2382 * since we currently handle a full code cache uniformly.
2383 */
2384 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) {
2385 UseInterpreter = true;
2386 if (UseCompiler || AlwaysCompileLoopMethods ) {
2387 if (xtty != nullptr) {
2388 stringStream s;
2389 // Dump code cache state into a buffer before locking the tty,
2390 // because log_state() will use locks causing lock conflicts.
2391 CodeCache::log_state(&s);
2392 // Lock to prevent tearing
2393 ttyLocker ttyl;
2394 xtty->begin_elem("code_cache_full");
2395 xtty->print("%s", s.freeze());
2396 xtty->stamp();
2397 xtty->end_elem();
2398 }
2399
2400 #ifndef PRODUCT
2401 if (ExitOnFullCodeCache) {
2402 codecache_print(/* detailed= */ true);
2403 before_exit(JavaThread::current());
2404 exit_globals(); // will delete tty
2405 vm_direct_exit(1);
2406 }
2407 #endif
2408 if (UseCodeCacheFlushing) {
2409 // Since code cache is full, immediately stop new compiles
2410 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2411 log_info(codecache)("Code cache is full - disabling compilation");
2412 }
2413 } else {
2414 disable_compilation_forever();
2415 }
2416
2417 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2418 }
2419 }
2420
2421 // ------------------------------------------------------------------
2422 // CompileBroker::update_compile_perf_data
2423 //
2424 // Record this compilation for debugging purposes.
2425 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2426 ResourceMark rm;
2427 char* method_name = method->name()->as_C_string();
2428 char current_method[CompilerCounters::cmname_buffer_length];
2429 size_t maxLen = CompilerCounters::cmname_buffer_length;
2430
2431 const char* class_name = method->method_holder()->name()->as_C_string();
2432
2433 size_t s1len = strlen(class_name);
2434 size_t s2len = strlen(method_name);
2435
2436 // check if we need to truncate the string
2437 if (s1len + s2len + 2 > maxLen) {
2438
2439 // the strategy is to lop off the leading characters of the
2440 // class name and the trailing characters of the method name.
2441
2442 if (s2len + 2 > maxLen) {
2443 // lop of the entire class name string, let snprintf handle
2444 // truncation of the method name.
2445 class_name += s1len; // null string
2446 }
2447 else {
2448 // lop off the extra characters from the front of the class name
2449 class_name += ((s1len + s2len + 2) - maxLen);
2450 }
2451 }
2452
2453 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2454
2455 int last_compile_type = normal_compile;
2456 if (CICountOSR && is_osr) {
2457 last_compile_type = osr_compile;
2458 } else if (CICountNative && method->is_native()) {
2459 last_compile_type = native_compile;
2460 }
2461
2462 CompilerCounters* counters = thread->counters();
2463 counters->set_current_method(current_method);
2464 counters->set_compile_type((jlong) last_compile_type);
2465 }
2466
2467 // ------------------------------------------------------------------
2468 // CompileBroker::collect_statistics
2469 //
2470 // Collect statistics about the compilation.
2471
2472 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2473 bool success = task->is_success();
2474 methodHandle method (thread, task->method());
2475 int compile_id = task->compile_id();
2476 bool is_osr = (task->osr_bci() != standard_entry_bci);
2477 const int comp_level = task->comp_level();
2478 CompilerCounters* counters = thread->counters();
2479
2480 MutexLocker locker(CompileStatistics_lock);
2481
2482 // _perf variables are production performance counters which are
2483 // updated regardless of the setting of the CITime and CITimeEach flags
2484 //
2485
2486 // account all time, including bailouts and failures in this counter;
2487 // C1 and C2 counters are counting both successful and unsuccessful compiles
2488 _t_total_compilation.add(time);
2489
2490 if (!success) {
2491 _total_bailout_count++;
2492 if (UsePerfData) {
2493 _perf_last_failed_method->set_value(counters->current_method());
2494 _perf_last_failed_type->set_value(counters->compile_type());
2495 _perf_total_bailout_count->inc();
2496 }
2497 _t_bailedout_compilation.add(time);
2498 } else if (!task->is_success()) {
2499 if (UsePerfData) {
2500 _perf_last_invalidated_method->set_value(counters->current_method());
2501 _perf_last_invalidated_type->set_value(counters->compile_type());
2502 _perf_total_invalidated_count->inc();
2503 }
2504 _total_invalidated_count++;
2505 _t_invalidated_compilation.add(time);
2506 } else {
2507 // Compilation succeeded
2508
2509 // update compilation ticks - used by the implementation of
2510 // java.lang.management.CompilationMXBean
2511 _perf_total_compilation->inc(time.ticks());
2512 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2513
2514 if (CITime) {
2515 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2516 if (is_osr) {
2517 _t_osr_compilation.add(time);
2518 _sum_osr_bytes_compiled += bytes_compiled;
2519 } else {
2520 _t_standard_compilation.add(time);
2521 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2522 }
2523
2524 // Collect statistic per compilation level
2525 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2526 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2527 if (is_osr) {
2528 stats->_osr.update(time, bytes_compiled);
2529 } else {
2530 stats->_standard.update(time, bytes_compiled);
2531 }
2532 stats->_nmethods_size += task->nm_total_size();
2533 stats->_nmethods_code_size += task->nm_insts_size();
2534 } else {
2535 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2536 }
2537
2538 // Collect statistic per compiler
2539 AbstractCompiler* comp = compiler(comp_level);
2540 if (comp) {
2541 CompilerStatistics* stats = comp->stats();
2542 if (is_osr) {
2543 stats->_osr.update(time, bytes_compiled);
2544 } else {
2545 stats->_standard.update(time, bytes_compiled);
2546 }
2547 stats->_nmethods_size += task->nm_total_size();
2548 stats->_nmethods_code_size += task->nm_insts_size();
2549 } else { // if (!comp)
2550 assert(false, "Compiler object must exist");
2551 }
2552 }
2553
2554 if (UsePerfData) {
2555 // save the name of the last method compiled
2556 _perf_last_method->set_value(counters->current_method());
2557 _perf_last_compile_type->set_value(counters->compile_type());
2558 _perf_last_compile_size->set_value(method->code_size() +
2559 task->num_inlined_bytecodes());
2560 if (is_osr) {
2561 _perf_osr_compilation->inc(time.ticks());
2562 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2563 } else {
2564 _perf_standard_compilation->inc(time.ticks());
2565 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2566 }
2567 }
2568
2569 if (CITimeEach) {
2570 double compile_time = time.seconds();
2571 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2572 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2573 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2574 }
2575
2576 // Collect counts of successful compilations
2577 _sum_nmethod_size += task->nm_total_size();
2578 _sum_nmethod_code_size += task->nm_insts_size();
2579 _total_compile_count++;
2580
2581 if (UsePerfData) {
2582 _perf_sum_nmethod_size->inc( task->nm_total_size());
2583 _perf_sum_nmethod_code_size->inc(task->nm_insts_size());
2584 _perf_total_compile_count->inc();
2585 }
2586
2587 if (is_osr) {
2588 if (UsePerfData) _perf_total_osr_compile_count->inc();
2589 _total_osr_compile_count++;
2590 } else {
2591 if (UsePerfData) _perf_total_standard_compile_count->inc();
2592 _total_standard_compile_count++;
2593 }
2594 }
2595 // set the current method for the thread to null
2596 if (UsePerfData) counters->set_current_method("");
2597 }
2598
2599 const char* CompileBroker::compiler_name(int comp_level) {
2600 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2601 if (comp == nullptr) {
2602 return "no compiler";
2603 } else {
2604 return (comp->name());
2605 }
2606 }
2607
2608 jlong CompileBroker::total_compilation_ticks() {
2609 return _perf_total_compilation != nullptr ? _perf_total_compilation->get_value() : 0;
2610 }
2611
2612 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2613 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}",
2614 name, stats->bytes_per_second(),
2615 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2616 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2617 stats->_nmethods_size, stats->_nmethods_code_size);
2618 }
2619
2620 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2621 if (per_compiler) {
2622 if (aggregate) {
2623 tty->cr();
2624 tty->print_cr("Individual compiler times (for compiled methods only)");
2625 tty->print_cr("------------------------------------------------");
2626 tty->cr();
2627 }
2628 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2629 AbstractCompiler* comp = _compilers[i];
2630 if (comp != nullptr) {
2631 print_times(comp->name(), comp->stats());
2632 }
2633 }
2634 if (aggregate) {
2635 tty->cr();
2636 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2637 tty->print_cr("------------------------------------------------");
2638 tty->cr();
2639 }
2640 char tier_name[256];
2641 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2642 CompilerStatistics* stats = &_stats_per_level[tier-1];
2643 os::snprintf_checked(tier_name, sizeof(tier_name), "Tier%d", tier);
2644 print_times(tier_name, stats);
2645 }
2646 }
2647
2648 if (!aggregate) {
2649 return;
2650 }
2651
2652 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2653 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2654 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2655
2656 uint standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2657 uint osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2658
2659 uint standard_compile_count = CompileBroker::_total_standard_compile_count;
2660 uint osr_compile_count = CompileBroker::_total_osr_compile_count;
2661 uint total_compile_count = CompileBroker::_total_compile_count;
2662 uint total_bailout_count = CompileBroker::_total_bailout_count;
2663 uint total_invalidated_count = CompileBroker::_total_invalidated_count;
2664
2665 uint nmethods_size = CompileBroker::_sum_nmethod_code_size;
2666 uint nmethods_code_size = CompileBroker::_sum_nmethod_size;
2667
2668 tty->cr();
2669 tty->print_cr("Accumulated compiler times");
2670 tty->print_cr("----------------------------------------------------------");
2671 //0000000000111111111122222222223333333333444444444455555555556666666666
2672 //0123456789012345678901234567890123456789012345678901234567890123456789
2673 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2674 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2675 standard_compilation.seconds(),
2676 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2677 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2678 CompileBroker::_t_bailedout_compilation.seconds(),
2679 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2680 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2681 osr_compilation.seconds(),
2682 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2683 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2684 CompileBroker::_t_invalidated_compilation.seconds(),
2685 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2686
2687 AbstractCompiler *comp = compiler(CompLevel_simple);
2688 if (comp != nullptr) {
2689 tty->cr();
2690 comp->print_timers();
2691 }
2692 comp = compiler(CompLevel_full_optimization);
2693 if (comp != nullptr) {
2694 tty->cr();
2695 comp->print_timers();
2696 }
2697 #if INCLUDE_JVMCI
2698 if (EnableJVMCI) {
2699 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null());
2700 if (jvmci_comp != nullptr && jvmci_comp != comp) {
2701 tty->cr();
2702 jvmci_comp->print_timers();
2703 }
2704 }
2705 #endif
2706
2707 tty->cr();
2708 tty->print_cr(" Total compiled methods : %8u methods", total_compile_count);
2709 tty->print_cr(" Standard compilation : %8u methods", standard_compile_count);
2710 tty->print_cr(" On stack replacement : %8u methods", osr_compile_count);
2711 uint tcb = osr_bytes_compiled + standard_bytes_compiled;
2712 tty->print_cr(" Total compiled bytecodes : %8u bytes", tcb);
2713 tty->print_cr(" Standard compilation : %8u bytes", standard_bytes_compiled);
2714 tty->print_cr(" On stack replacement : %8u bytes", osr_bytes_compiled);
2715 double tcs = total_compilation.seconds();
2716 uint bps = tcs == 0.0 ? 0 : (uint)(tcb / tcs);
2717 tty->print_cr(" Average compilation speed : %8u bytes/s", bps);
2718 tty->cr();
2719 tty->print_cr(" nmethod code size : %8u bytes", nmethods_code_size);
2720 tty->print_cr(" nmethod total size : %8u bytes", nmethods_size);
2721 }
2722
2723 // Print general/accumulated JIT information.
2724 void CompileBroker::print_info(outputStream *out) {
2725 if (out == nullptr) out = tty;
2726 out->cr();
2727 out->print_cr("======================");
2728 out->print_cr(" General JIT info ");
2729 out->print_cr("======================");
2730 out->cr();
2731 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2732 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2733 out->cr();
2734 out->print_cr("CodeCache overview");
2735 out->print_cr("--------------------------------------------------------");
2736 out->cr();
2737 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2738 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2739 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2740 out->cr();
2741 }
2742
2743 // Note: tty_lock must not be held upon entry to this function.
2744 // Print functions called from herein do "micro-locking" on tty_lock.
2745 // That's a tradeoff which keeps together important blocks of output.
2746 // At the same time, continuous tty_lock hold time is kept in check,
2747 // preventing concurrently printing threads from stalling a long time.
2748 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2749 TimeStamp ts_total;
2750 TimeStamp ts_global;
2751 TimeStamp ts;
2752
2753 bool allFun = !strcmp(function, "all");
2754 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2755 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2756 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2757 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2758 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2759 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2760 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2761 bool discard = !strcmp(function, "discard") || allFun;
2762
2763 if (out == nullptr) {
2764 out = tty;
2765 }
2766
2767 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2768 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2769 out->cr();
2770 return;
2771 }
2772
2773 ts_total.update(); // record starting point
2774
2775 if (aggregate) {
2776 print_info(out);
2777 }
2778
2779 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2780 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2781 // When we request individual parts of the analysis via the jcmd interface, it is possible
2782 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2783 // updated the aggregated data. We will then see a modified, but again consistent, view
2784 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2785 // a lock across user interaction.
2786
2787 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2788 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2789 // leading to an unnecessarily long hold time of the other locks we acquired before.
2790 ts.update(); // record starting point
2791 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2792 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2793
2794 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2795 // Unfortunately, such protection is not sufficient:
2796 // When a new nmethod is created via ciEnv::register_method(), the
2797 // Compile_lock is taken first. After some initializations,
2798 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2799 // immediately (after finalizing the oop references). To lock out concurrent
2800 // modifiers, we have to grab both locks as well in the described sequence.
2801 //
2802 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2803 // for the entire duration of aggregation and printing. That makes sure we see
2804 // a consistent picture and do not run into issues caused by concurrent alterations.
2805 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2806 !Compile_lock->owned_by_self();
2807 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2808 !CodeCache_lock->owned_by_self();
2809 Mutex* global_lock_1 = allFun ? (should_take_Compile_lock ? Compile_lock : nullptr) : nullptr;
2810 Monitor* global_lock_2 = allFun ? (should_take_CodeCache_lock ? CodeCache_lock : nullptr) : nullptr;
2811 Mutex* function_lock_1 = allFun ? nullptr : (should_take_Compile_lock ? Compile_lock : nullptr);
2812 Monitor* function_lock_2 = allFun ? nullptr : (should_take_CodeCache_lock ? CodeCache_lock : nullptr);
2813 ts_global.update(); // record starting point
2814 MutexLocker mu1(global_lock_1, Mutex::_safepoint_check_flag);
2815 MutexLocker mu2(global_lock_2, Mutex::_no_safepoint_check_flag);
2816 if ((global_lock_1 != nullptr) || (global_lock_2 != nullptr)) {
2817 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2818 ts_global.update(); // record starting point
2819 }
2820
2821 if (aggregate) {
2822 ts.update(); // record starting point
2823 MutexLocker mu11(function_lock_1, Mutex::_safepoint_check_flag);
2824 MutexLocker mu22(function_lock_2, Mutex::_no_safepoint_check_flag);
2825 if ((function_lock_1 != nullptr) || (function_lock_2 != nullptr)) {
2826 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2827 }
2828
2829 ts.update(); // record starting point
2830 CodeCache::aggregate(out, granularity);
2831 if ((function_lock_1 != nullptr) || (function_lock_2 != nullptr)) {
2832 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2833 }
2834 }
2835
2836 if (usedSpace) CodeCache::print_usedSpace(out);
2837 if (freeSpace) CodeCache::print_freeSpace(out);
2838 if (methodCount) CodeCache::print_count(out);
2839 if (methodSpace) CodeCache::print_space(out);
2840 if (methodAge) CodeCache::print_age(out);
2841 if (methodNames) {
2842 if (allFun) {
2843 // print_names() can only be used safely if the locks have been continuously held
2844 // since aggregation begin. That is true only for function "all".
2845 CodeCache::print_names(out);
2846 } else {
2847 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2848 }
2849 }
2850 if (discard) CodeCache::discard(out);
2851
2852 if ((global_lock_1 != nullptr) || (global_lock_2 != nullptr)) {
2853 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2854 }
2855 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2856 }