1 /*
2 * Copyright (c) 1999, 2022, 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 "jvm.h"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/codeHeapState.hpp"
33 #include "code/dependencyContext.hpp"
34 #include "compiler/compilationLog.hpp"
35 #include "compiler/compilationPolicy.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/compileLog.hpp"
38 #include "compiler/compilerEvent.hpp"
39 #include "compiler/compilerOracle.hpp"
40 #include "compiler/directivesParser.hpp"
41 #include "interpreter/linkResolver.hpp"
42 #include "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 #if INCLUDE_JVMCI
80 #include "jvmci/jvmciEnv.hpp"
81 #include "jvmci/jvmciRuntime.hpp"
82 #endif
83 #ifdef COMPILER2
84 #include "opto/c2compiler.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 = NULL;
136 jobject* CompileBroker::_compiler2_objects = NULL;
137
138 CompileLog** CompileBroker::_compiler1_logs = NULL;
139 CompileLog** CompileBroker::_compiler2_logs = NULL;
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 = NULL;
148 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
149 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
150
151 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
154 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
155 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
156
157 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
158 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
159 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
160 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
161
162 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
163 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
164 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
165 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
166 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
167 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
168 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
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 int CompileBroker::_total_bailout_count = 0;
178 int CompileBroker::_total_invalidated_count = 0;
179 int CompileBroker::_total_compile_count = 0;
180 int CompileBroker::_total_osr_compile_count = 0;
181 int CompileBroker::_total_standard_compile_count = 0;
182 int CompileBroker::_total_compiler_stopped_count = 0;
183 int CompileBroker::_total_compiler_restarted_count = 0;
184
185 int CompileBroker::_sum_osr_bytes_compiled = 0;
186 int CompileBroker::_sum_standard_bytes_compiled = 0;
187 int CompileBroker::_sum_nmethod_size = 0;
188 int 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 = NULL;
195 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
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 != NULL && !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 != NULL && !task->is_unloaded()) task->log_task_done(log);
227 thread->set_task(NULL);
228 thread->set_env(NULL);
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(NULL);
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] = NULL;
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(NULL);
318 task->set_prev(NULL);
319
320 if (_last == NULL) {
321 // The compile queue is empty.
322 assert(_first == NULL, "queue is empty");
323 _first = task;
324 _last = task;
325 } else {
326 // Append the task to the queue.
327 assert(_last->next() == NULL, "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 != NULL) {
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 != NULL) {
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 = NULL;
372 _last = NULL;
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 == NULL) {
394 // Exit loop if compilation is disabled forever
395 if (CompileBroker::is_compilation_disabled_forever()) {
396 return NULL;
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 == NULL) {
417 // Still nothing to compile. Give caller a chance to stop this thread.
418 if (CompileBroker::can_remove(CompilerThread::current(), false)) return NULL;
419 }
420 }
421
422 if (CompileBroker::is_compilation_disabled_forever()) {
423 return NULL;
424 }
425
426 CompileTask* task;
427 {
428 NoSafepointVerifier nsv;
429 task = CompilationPolicy::select_task(this);
430 if (task != NULL) {
431 task = task->select_for_compilation();
432 }
433 }
434
435 if (task != NULL) {
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 != NULL) {
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 = NULL;
459 {
460 MutexUnlocker ul(MethodCompileQueue_lock);
461 for (CompileTask* task = head; task != NULL; ) {
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() != NULL) {
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() != NULL) {
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(NULL);
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 != NULL) {
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 NULL;
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 != NULL) {
527 _c1_compile_queue->print(st);
528 }
529 if (_c2_compile_queue != NULL) {
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 == NULL) {
539 st->print_cr("Empty");
540 } else {
541 while (task != NULL) {
542 task->print(st, NULL, 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, false /* not visible */, 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 = NULL;
836
837 switch (type) {
838 case compiler_t:
839 assert(comp != NULL, "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 != NULL && new_thread->osthread() != NULL) {
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 NULL;
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
908 void CompileBroker::init_compiler_threads() {
909 // Ensure any exceptions lead to vm_exit_during_initialization.
910 EXCEPTION_MARK;
911 #if !defined(ZERO)
912 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
913 #endif // !ZERO
914 // Initialize the compilation queue
915 if (_c2_count > 0) {
916 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
917 _c2_compile_queue = new CompileQueue(name);
918 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
919 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
920 }
921 if (_c1_count > 0) {
922 _c1_compile_queue = new CompileQueue("C1 compile queue");
923 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
924 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
925 }
926
927 char name_buffer[256];
928
929 for (int i = 0; i < _c2_count; i++) {
930 jobject thread_handle = NULL;
931 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
932 // for JVMCI compiler which can create further ones on demand.
933 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
934 // Create a name for our thread.
935 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
936 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
937 thread_handle = JNIHandles::make_global(thread_oop);
938 JVMCI_ONLY(})
939 _compiler2_objects[i] = thread_handle;
940 _compiler2_logs[i] = NULL;
941
942 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
943 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
944 assert(ct != NULL, "should have been handled for initial thread");
945 _compilers[1]->set_num_compiler_threads(i + 1);
946 if (TraceCompilerThreads) {
947 ResourceMark rm;
948 ThreadsListHandle tlh; // name() depends on the TLH.
949 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
950 tty->print_cr("Added initial compiler thread %s", ct->name());
951 }
952 }
953 }
954
955 for (int i = 0; i < _c1_count; i++) {
956 // Create a name for our thread.
957 sprintf(name_buffer, "C1 CompilerThread%d", i);
958 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
959 jobject thread_handle = JNIHandles::make_global(thread_oop);
960 _compiler1_objects[i] = thread_handle;
961 _compiler1_logs[i] = NULL;
962
963 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
964 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
965 assert(ct != NULL, "should have been handled for initial thread");
966 _compilers[0]->set_num_compiler_threads(i + 1);
967 if (TraceCompilerThreads) {
968 ResourceMark rm;
969 ThreadsListHandle tlh; // name() depends on the TLH.
970 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
971 tty->print_cr("Added initial compiler thread %s", ct->name());
972 }
973 }
974 }
975
976 if (UsePerfData) {
977 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
978 }
979
980 #if defined(ASSERT) && COMPILER2_OR_JVMCI
981 if (DeoptimizeObjectsALot) {
982 // Initialize and start the object deoptimizer threads
983 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
984 for (int count = 0; count < total_count; count++) {
985 Handle thread_oop = create_thread_oop("Deoptimize objects a lot single mode", CHECK);
986 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
987 make_thread(deoptimizer_t, thread_handle, NULL, NULL, THREAD);
988 }
989 }
990 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
991 }
992
993 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
994
995 julong available_memory = os::available_memory();
996 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
997 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
998 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
999
1000 // Only do attempt to start additional threads if the lock is free.
1001 if (!CompileThread_lock->try_lock()) return;
1002
1003 if (_c2_compile_queue != NULL) {
1004 int old_c2_count = _compilers[1]->num_compiler_threads();
1005 int new_c2_count = MIN4(_c2_count,
1006 _c2_compile_queue->size() / 2,
1007 (int)(available_memory / (200*M)),
1008 (int)(available_cc_np / (128*K)));
1009
1010 for (int i = old_c2_count; i < new_c2_count; i++) {
1011 #if INCLUDE_JVMCI
1012 if (UseJVMCICompiler) {
1013 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
1014 // objects as their existence is completely hidden from the rest of
1015 // the VM (and those compiler threads can't call Java code to do the
1016 // creation anyway). For JVMCI we have to create new j.l.Thread objects
1017 // as they are visible and we can see unexpected thread lifecycle
1018 // transitions if we bind them to new JavaThreads.
1019 if (!THREAD->can_call_java()) break;
1020 char name_buffer[256];
1021 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
1022 Handle thread_oop;
1023 {
1024 // We have to give up the lock temporarily for the Java calls.
1025 MutexUnlocker mu(CompileThread_lock);
1026 thread_oop = create_thread_oop(name_buffer, THREAD);
1027 }
1028 if (HAS_PENDING_EXCEPTION) {
1029 if (TraceCompilerThreads) {
1030 ResourceMark rm;
1031 tty->print_cr("JVMCI compiler thread creation failed:");
1032 PENDING_EXCEPTION->print();
1033 }
1034 CLEAR_PENDING_EXCEPTION;
1035 break;
1036 }
1037 // Check if another thread has beaten us during the Java calls.
1038 if (_compilers[1]->num_compiler_threads() != i) break;
1039 jobject thread_handle = JNIHandles::make_global(thread_oop);
1040 assert(compiler2_object(i) == NULL, "Old one must be released!");
1041 _compiler2_objects[i] = thread_handle;
1042 }
1043 #endif
1044 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1045 if (ct == NULL) break;
1046 _compilers[1]->set_num_compiler_threads(i + 1);
1047 if (TraceCompilerThreads) {
1048 ResourceMark rm;
1049 ThreadsListHandle tlh; // name() depends on the TLH.
1050 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1051 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
1052 ct->name(), (int)(available_memory/M), (int)(available_cc_np/M));
1053 }
1054 }
1055 }
1056
1057 if (_c1_compile_queue != NULL) {
1058 int old_c1_count = _compilers[0]->num_compiler_threads();
1059 int new_c1_count = MIN4(_c1_count,
1060 _c1_compile_queue->size() / 4,
1061 (int)(available_memory / (100*M)),
1062 (int)(available_cc_p / (128*K)));
1063
1064 for (int i = old_c1_count; i < new_c1_count; i++) {
1065 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1066 if (ct == NULL) break;
1067 _compilers[0]->set_num_compiler_threads(i + 1);
1068 if (TraceCompilerThreads) {
1069 ResourceMark rm;
1070 ThreadsListHandle tlh; // name() depends on the TLH.
1071 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1072 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
1073 ct->name(), (int)(available_memory/M), (int)(available_cc_p/M));
1074 }
1075 }
1076 }
1077
1078 CompileThread_lock->unlock();
1079 }
1080
1081
1082 /**
1083 * Set the methods on the stack as on_stack so that redefine classes doesn't
1084 * reclaim them. This method is executed at a safepoint.
1085 */
1086 void CompileBroker::mark_on_stack() {
1087 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1088 // Since we are at a safepoint, we do not need a lock to access
1089 // the compile queues.
1090 if (_c2_compile_queue != NULL) {
1091 _c2_compile_queue->mark_on_stack();
1092 }
1093 if (_c1_compile_queue != NULL) {
1094 _c1_compile_queue->mark_on_stack();
1095 }
1096 }
1097
1098 // ------------------------------------------------------------------
1099 // CompileBroker::compile_method
1100 //
1101 // Request compilation of a method.
1102 void CompileBroker::compile_method_base(const methodHandle& method,
1103 int osr_bci,
1104 int comp_level,
1105 const methodHandle& hot_method,
1106 int hot_count,
1107 CompileTask::CompileReason compile_reason,
1108 bool blocking,
1109 Thread* thread) {
1110 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1111 assert(method->method_holder()->is_instance_klass(),
1112 "sanity check");
1113 assert(!method->method_holder()->is_not_initialized(),
1114 "method holder must be initialized");
1115 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1116
1117 if (CIPrintRequests) {
1118 tty->print("request: ");
1119 method->print_short_name(tty);
1120 if (osr_bci != InvocationEntryBci) {
1121 tty->print(" osr_bci: %d", osr_bci);
1122 }
1123 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1124 if (!hot_method.is_null()) {
1125 tty->print(" hot: ");
1126 if (hot_method() != method()) {
1127 hot_method->print_short_name(tty);
1128 } else {
1129 tty->print("yes");
1130 }
1131 }
1132 tty->cr();
1133 }
1134
1135 // A request has been made for compilation. Before we do any
1136 // real work, check to see if the method has been compiled
1137 // in the meantime with a definitive result.
1138 if (compilation_is_complete(method, osr_bci, comp_level)) {
1139 return;
1140 }
1141
1142 #ifndef PRODUCT
1143 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1144 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1145 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1146 return;
1147 }
1148 }
1149 #endif
1150
1151 // If this method is already in the compile queue, then
1152 // we do not block the current thread.
1153 if (compilation_is_in_queue(method)) {
1154 // We may want to decay our counter a bit here to prevent
1155 // multiple denied requests for compilation. This is an
1156 // open compilation policy issue. Note: The other possibility,
1157 // in the case that this is a blocking compile request, is to have
1158 // all subsequent blocking requesters wait for completion of
1159 // ongoing compiles. Note that in this case we'll need a protocol
1160 // for freeing the associated compile tasks. [Or we could have
1161 // a single static monitor on which all these waiters sleep.]
1162 return;
1163 }
1164
1165 // Tiered policy requires MethodCounters to exist before adding a method to
1166 // the queue. Create if we don't have them yet.
1167 method->get_method_counters(thread);
1168
1169 // Outputs from the following MutexLocker block:
1170 CompileTask* task = NULL;
1171 CompileQueue* queue = compile_queue(comp_level);
1172
1173 // Acquire our lock.
1174 {
1175 MutexLocker locker(thread, MethodCompileQueue_lock);
1176
1177 // Make sure the method has not slipped into the queues since
1178 // last we checked; note that those checks were "fast bail-outs".
1179 // Here we need to be more careful, see 14012000 below.
1180 if (compilation_is_in_queue(method)) {
1181 return;
1182 }
1183
1184 // We need to check again to see if the compilation has
1185 // completed. A previous compilation may have registered
1186 // some result.
1187 if (compilation_is_complete(method, osr_bci, comp_level)) {
1188 return;
1189 }
1190
1191 // We now know that this compilation is not pending, complete,
1192 // or prohibited. Assign a compile_id to this compilation
1193 // and check to see if it is in our [Start..Stop) range.
1194 int compile_id = assign_compile_id(method, osr_bci);
1195 if (compile_id == 0) {
1196 // The compilation falls outside the allowed range.
1197 return;
1198 }
1199
1200 #if INCLUDE_JVMCI
1201 if (UseJVMCICompiler && blocking) {
1202 // Don't allow blocking compiles for requests triggered by JVMCI.
1203 if (thread->is_Compiler_thread()) {
1204 blocking = false;
1205 }
1206
1207 if (!UseJVMCINativeLibrary) {
1208 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1209 vframeStream vfst(JavaThread::cast(thread));
1210 for (; !vfst.at_end(); vfst.next()) {
1211 if (vfst.method()->is_static_initializer() ||
1212 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1213 vfst.method()->name() == vmSymbols::loadClass_name())) {
1214 blocking = false;
1215 break;
1216 }
1217 }
1218 }
1219
1220 // Don't allow blocking compilation requests to JVMCI
1221 // if JVMCI itself is not yet initialized
1222 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1223 blocking = false;
1224 }
1225
1226 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1227 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1228 // such as the DestroyJavaVM thread.
1229 if (JVMCI::in_shutdown()) {
1230 blocking = false;
1231 }
1232 }
1233 #endif // INCLUDE_JVMCI
1234
1235 // We will enter the compilation in the queue.
1236 // 14012000: Note that this sets the queued_for_compile bits in
1237 // the target method. We can now reason that a method cannot be
1238 // queued for compilation more than once, as follows:
1239 // Before a thread queues a task for compilation, it first acquires
1240 // the compile queue lock, then checks if the method's queued bits
1241 // are set or it has already been compiled. Thus there can not be two
1242 // instances of a compilation task for the same method on the
1243 // compilation queue. Consider now the case where the compilation
1244 // thread has already removed a task for that method from the queue
1245 // and is in the midst of compiling it. In this case, the
1246 // queued_for_compile bits must be set in the method (and these
1247 // will be visible to the current thread, since the bits were set
1248 // under protection of the compile queue lock, which we hold now.
1249 // When the compilation completes, the compiler thread first sets
1250 // the compilation result and then clears the queued_for_compile
1251 // bits. Neither of these actions are protected by a barrier (or done
1252 // under the protection of a lock), so the only guarantee we have
1253 // (on machines with TSO (Total Store Order)) is that these values
1254 // will update in that order. As a result, the only combinations of
1255 // these bits that the current thread will see are, in temporal order:
1256 // <RESULT, QUEUE> :
1257 // <0, 1> : in compile queue, but not yet compiled
1258 // <1, 1> : compiled but queue bit not cleared
1259 // <1, 0> : compiled and queue bit cleared
1260 // Because we first check the queue bits then check the result bits,
1261 // we are assured that we cannot introduce a duplicate task.
1262 // Note that if we did the tests in the reverse order (i.e. check
1263 // result then check queued bit), we could get the result bit before
1264 // the compilation completed, and the queue bit after the compilation
1265 // completed, and end up introducing a "duplicate" (redundant) task.
1266 // In that case, the compiler thread should first check if a method
1267 // has already been compiled before trying to compile it.
1268 // NOTE: in the event that there are multiple compiler threads and
1269 // there is de-optimization/recompilation, things will get hairy,
1270 // and in that case it's best to protect both the testing (here) of
1271 // these bits, and their updating (here and elsewhere) under a
1272 // common lock.
1273 task = create_compile_task(queue,
1274 compile_id, method,
1275 osr_bci, comp_level,
1276 hot_method, hot_count, compile_reason,
1277 blocking);
1278 }
1279
1280 if (blocking) {
1281 wait_for_completion(task);
1282 }
1283 }
1284
1285 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1286 int comp_level,
1287 const methodHandle& hot_method, int hot_count,
1288 CompileTask::CompileReason compile_reason,
1289 TRAPS) {
1290 // Do nothing if compilebroker is not initialized or compiles are submitted on level none
1291 if (!_initialized || comp_level == CompLevel_none) {
1292 return NULL;
1293 }
1294
1295 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1296 assert(comp != NULL, "Ensure we have a compiler");
1297
1298 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1299 // CompileBroker::compile_method can trap and can have pending async exception.
1300 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1301 DirectivesStack::release(directive);
1302 return nm;
1303 }
1304
1305 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1306 int comp_level,
1307 const methodHandle& hot_method, int hot_count,
1308 CompileTask::CompileReason compile_reason,
1309 DirectiveSet* directive,
1310 TRAPS) {
1311
1312 // make sure arguments make sense
1313 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1314 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1315 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1316 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1317 // return quickly if possible
1318
1319 // lock, make sure that the compilation
1320 // isn't prohibited in a straightforward way.
1321 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1322 if (comp == NULL || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1323 return NULL;
1324 }
1325
1326 #if INCLUDE_JVMCI
1327 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1328 return NULL;
1329 }
1330 #endif
1331
1332 if (osr_bci == InvocationEntryBci) {
1333 // standard compilation
1334 CompiledMethod* method_code = method->code();
1335 if (method_code != NULL && method_code->is_nmethod()) {
1336 if (compilation_is_complete(method, osr_bci, comp_level)) {
1337 return (nmethod*) method_code;
1338 }
1339 }
1340 if (method->is_not_compilable(comp_level)) {
1341 return NULL;
1342 }
1343 } else {
1344 // osr compilation
1345 // We accept a higher level osr method
1346 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1347 if (nm != NULL) return nm;
1348 if (method->is_not_osr_compilable(comp_level)) return NULL;
1349 }
1350
1351 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1352 // some prerequisites that are compiler specific
1353 if (comp->is_c2() || comp->is_jvmci()) {
1354 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1355 // Resolve all classes seen in the signature of the method
1356 // we are compiling.
1357 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1358 }
1359
1360 // If the method is native, do the lookup in the thread requesting
1361 // the compilation. Native lookups can load code, which is not
1362 // permitted during compilation.
1363 //
1364 // Note: A native method implies non-osr compilation which is
1365 // checked with an assertion at the entry of this method.
1366 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1367 address adr = NativeLookup::lookup(method, THREAD);
1368 if (HAS_PENDING_EXCEPTION) {
1369 // In case of an exception looking up the method, we just forget
1370 // about it. The interpreter will kick-in and throw the exception.
1371 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1372 CLEAR_PENDING_EXCEPTION;
1373 return NULL;
1374 }
1375 assert(method->has_native_function(), "must have native code by now");
1376 }
1377
1378 // RedefineClasses() has replaced this method; just return
1379 if (method->is_old()) {
1380 return NULL;
1381 }
1382
1383 // JVMTI -- post_compile_event requires jmethod_id() that may require
1384 // a lock the compiling thread can not acquire. Prefetch it here.
1385 if (JvmtiExport::should_post_compiled_method_load()) {
1386 method->jmethod_id();
1387 }
1388
1389 // do the compilation
1390 if (method->is_native()) {
1391 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1392 #if defined(X86) && !defined(ZERO)
1393 // The following native methods:
1394 //
1395 // java.lang.Float.intBitsToFloat
1396 // java.lang.Float.floatToRawIntBits
1397 // java.lang.Double.longBitsToDouble
1398 // java.lang.Double.doubleToRawLongBits
1399 //
1400 // are called through the interpreter even if interpreter native stubs
1401 // are not preferred (i.e., calling through adapter handlers is preferred).
1402 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1403 // if the version of the methods from the native libraries is called.
1404 // As the interpreter and the C2-intrinsified version of the methods preserves
1405 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1406 if ((UseSSE >= 1 &&
1407 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1408 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1409 (UseSSE >= 2 &&
1410 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1411 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1412 return NULL;
1413 }
1414 #endif // X86 && !ZERO
1415
1416 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1417 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1418 //
1419 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1420 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1421 AdapterHandlerLibrary::create_native_wrapper(method);
1422 } else {
1423 return NULL;
1424 }
1425 } else {
1426 // If the compiler is shut off due to code cache getting full
1427 // fail out now so blocking compiles dont hang the java thread
1428 if (!should_compile_new_jobs()) {
1429 return NULL;
1430 }
1431 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1432 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1433 }
1434
1435 // return requested nmethod
1436 // We accept a higher level osr method
1437 if (osr_bci == InvocationEntryBci) {
1438 CompiledMethod* code = method->code();
1439 if (code == NULL) {
1440 return (nmethod*) code;
1441 } else {
1442 return code->as_nmethod_or_null();
1443 }
1444 }
1445 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1446 }
1447
1448
1449 // ------------------------------------------------------------------
1450 // CompileBroker::compilation_is_complete
1451 //
1452 // See if compilation of this method is already complete.
1453 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1454 int osr_bci,
1455 int comp_level) {
1456 bool is_osr = (osr_bci != standard_entry_bci);
1457 if (is_osr) {
1458 if (method->is_not_osr_compilable(comp_level)) {
1459 return true;
1460 } else {
1461 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1462 return (result != NULL);
1463 }
1464 } else {
1465 if (method->is_not_compilable(comp_level)) {
1466 return true;
1467 } else {
1468 CompiledMethod* result = method->code();
1469 if (result == NULL) return false;
1470 return comp_level == result->comp_level();
1471 }
1472 }
1473 }
1474
1475
1476 /**
1477 * See if this compilation is already requested.
1478 *
1479 * Implementation note: there is only a single "is in queue" bit
1480 * for each method. This means that the check below is overly
1481 * conservative in the sense that an osr compilation in the queue
1482 * will block a normal compilation from entering the queue (and vice
1483 * versa). This can be remedied by a full queue search to disambiguate
1484 * cases. If it is deemed profitable, this may be done.
1485 */
1486 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1487 return method->queued_for_compilation();
1488 }
1489
1490 // ------------------------------------------------------------------
1491 // CompileBroker::compilation_is_prohibited
1492 //
1493 // See if this compilation is not allowed.
1494 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1495 bool is_native = method->is_native();
1496 // Some compilers may not support the compilation of natives.
1497 AbstractCompiler *comp = compiler(comp_level);
1498 if (is_native && (!CICompileNatives || comp == NULL)) {
1499 method->set_not_compilable_quietly("native methods not supported", comp_level);
1500 return true;
1501 }
1502
1503 bool is_osr = (osr_bci != standard_entry_bci);
1504 // Some compilers may not support on stack replacement.
1505 if (is_osr && (!CICompileOSR || comp == NULL)) {
1506 method->set_not_osr_compilable("OSR not supported", comp_level);
1507 return true;
1508 }
1509
1510 // The method may be explicitly excluded by the user.
1511 double scale;
1512 if (excluded || (CompilerOracle::has_option_value(method, CompileCommand::CompileThresholdScaling, scale) && scale == 0)) {
1513 bool quietly = CompilerOracle::be_quiet();
1514 if (PrintCompilation && !quietly) {
1515 // This does not happen quietly...
1516 ResourceMark rm;
1517 tty->print("### Excluding %s:%s",
1518 method->is_native() ? "generation of native wrapper" : "compile",
1519 (method->is_static() ? " static" : ""));
1520 method->print_short_name(tty);
1521 tty->cr();
1522 }
1523 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1524 }
1525
1526 return false;
1527 }
1528
1529 /**
1530 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1531 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1532 * The function also allows to generate separate compilation IDs for OSR compilations.
1533 */
1534 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1535 #ifdef ASSERT
1536 bool is_osr = (osr_bci != standard_entry_bci);
1537 int id;
1538 if (method->is_native()) {
1539 assert(!is_osr, "can't be osr");
1540 // Adapters, native wrappers and method handle intrinsics
1541 // should be generated always.
1542 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1543 } else if (CICountOSR && is_osr) {
1544 id = Atomic::add(&_osr_compilation_id, 1);
1545 if (CIStartOSR <= id && id < CIStopOSR) {
1546 return id;
1547 }
1548 } else {
1549 id = Atomic::add(&_compilation_id, 1);
1550 if (CIStart <= id && id < CIStop) {
1551 return id;
1552 }
1553 }
1554
1555 // Method was not in the appropriate compilation range.
1556 method->set_not_compilable_quietly("Not in requested compile id range");
1557 return 0;
1558 #else
1559 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1560 // only _compilation_id is incremented.
1561 return Atomic::add(&_compilation_id, 1);
1562 #endif
1563 }
1564
1565 // ------------------------------------------------------------------
1566 // CompileBroker::assign_compile_id_unlocked
1567 //
1568 // Public wrapper for assign_compile_id that acquires the needed locks
1569 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1570 MutexLocker locker(thread, MethodCompileQueue_lock);
1571 return assign_compile_id(method, osr_bci);
1572 }
1573
1574 // ------------------------------------------------------------------
1575 // CompileBroker::create_compile_task
1576 //
1577 // Create a CompileTask object representing the current request for
1578 // compilation. Add this task to the queue.
1579 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1580 int compile_id,
1581 const methodHandle& method,
1582 int osr_bci,
1583 int comp_level,
1584 const methodHandle& hot_method,
1585 int hot_count,
1586 CompileTask::CompileReason compile_reason,
1587 bool blocking) {
1588 CompileTask* new_task = CompileTask::allocate();
1589 new_task->initialize(compile_id, method, osr_bci, comp_level,
1590 hot_method, hot_count, compile_reason,
1591 blocking);
1592 queue->add(new_task);
1593 return new_task;
1594 }
1595
1596 #if INCLUDE_JVMCI
1597 // The number of milliseconds to wait before checking if
1598 // JVMCI compilation has made progress.
1599 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1600
1601 // The number of JVMCI compilation progress checks that must fail
1602 // before unblocking a thread waiting for a blocking compilation.
1603 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1604
1605 /**
1606 * Waits for a JVMCI compiler to complete a given task. This thread
1607 * waits until either the task completes or it sees no JVMCI compilation
1608 * progress for N consecutive milliseconds where N is
1609 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1610 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1611 *
1612 * @return true if this thread needs to free/recycle the task
1613 */
1614 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1615 assert(UseJVMCICompiler, "sanity");
1616 MonitorLocker ml(thread, task->lock());
1617 int progress_wait_attempts = 0;
1618 jint thread_jvmci_compilation_ticks = 0;
1619 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1620 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1621 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1622 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1623
1624 bool progress;
1625 if (jvmci_compile_state != NULL) {
1626 jint ticks = jvmci_compile_state->compilation_ticks();
1627 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1628 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1629 thread_jvmci_compilation_ticks = ticks;
1630 } else {
1631 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1632 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1633 // compilation ticks to determine whether JVMCI compilation
1634 // is still making progress through the JVMCI compiler queue.
1635 jint ticks = jvmci->global_compilation_ticks();
1636 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1637 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1638 global_jvmci_compilation_ticks = ticks;
1639 }
1640
1641 if (!progress) {
1642 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1643 if (PrintCompilation) {
1644 task->print(tty, "wait for blocking compilation timed out");
1645 }
1646 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1647 break;
1648 }
1649 } else {
1650 progress_wait_attempts = 0;
1651 }
1652 }
1653 task->clear_waiter();
1654 return task->is_complete();
1655 }
1656 #endif
1657
1658 /**
1659 * Wait for the compilation task to complete.
1660 */
1661 void CompileBroker::wait_for_completion(CompileTask* task) {
1662 if (CIPrintCompileQueue) {
1663 ttyLocker ttyl;
1664 tty->print_cr("BLOCKING FOR COMPILE");
1665 }
1666
1667 assert(task->is_blocking(), "can only wait on blocking task");
1668
1669 JavaThread* thread = JavaThread::current();
1670
1671 methodHandle method(thread, task->method());
1672 bool free_task;
1673 #if INCLUDE_JVMCI
1674 AbstractCompiler* comp = compiler(task->comp_level());
1675 if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
1676 // It may return before compilation is completed.
1677 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1678 } else
1679 #endif
1680 {
1681 MonitorLocker ml(thread, task->lock());
1682 free_task = true;
1683 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1684 ml.wait();
1685 }
1686 }
1687
1688 if (free_task) {
1689 if (is_compilation_disabled_forever()) {
1690 CompileTask::free(task);
1691 return;
1692 }
1693
1694 // It is harmless to check this status without the lock, because
1695 // completion is a stable property (until the task object is recycled).
1696 assert(task->is_complete(), "Compilation should have completed");
1697
1698 // By convention, the waiter is responsible for recycling a
1699 // blocking CompileTask. Since there is only one waiter ever
1700 // waiting on a CompileTask, we know that no one else will
1701 // be using this CompileTask; we can free it.
1702 CompileTask::free(task);
1703 }
1704 }
1705
1706 /**
1707 * Initialize compiler thread(s) + compiler object(s). The postcondition
1708 * of this function is that the compiler runtimes are initialized and that
1709 * compiler threads can start compiling.
1710 */
1711 bool CompileBroker::init_compiler_runtime() {
1712 CompilerThread* thread = CompilerThread::current();
1713 AbstractCompiler* comp = thread->compiler();
1714 // Final sanity check - the compiler object must exist
1715 guarantee(comp != NULL, "Compiler object must exist");
1716
1717 {
1718 // Must switch to native to allocate ci_env
1719 ThreadToNativeFromVM ttn(thread);
1720 ciEnv ci_env((CompileTask*)NULL);
1721 // Cache Jvmti state
1722 ci_env.cache_jvmti_state();
1723 // Cache DTrace flags
1724 ci_env.cache_dtrace_flags();
1725
1726 // Switch back to VM state to do compiler initialization
1727 ThreadInVMfromNative tv(thread);
1728
1729 // Perform per-thread and global initializations
1730 comp->initialize();
1731 }
1732
1733 if (comp->is_failed()) {
1734 disable_compilation_forever();
1735 // If compiler initialization failed, no compiler thread that is specific to a
1736 // particular compiler runtime will ever start to compile methods.
1737 shutdown_compiler_runtime(comp, thread);
1738 return false;
1739 }
1740
1741 // C1 specific check
1742 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1743 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1744 return false;
1745 }
1746
1747 return true;
1748 }
1749
1750 /**
1751 * If C1 and/or C2 initialization failed, we shut down all compilation.
1752 * We do this to keep things simple. This can be changed if it ever turns
1753 * out to be a problem.
1754 */
1755 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1756 // Free buffer blob, if allocated
1757 if (thread->get_buffer_blob() != NULL) {
1758 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1759 CodeCache::free(thread->get_buffer_blob());
1760 }
1761
1762 if (comp->should_perform_shutdown()) {
1763 // There are two reasons for shutting down the compiler
1764 // 1) compiler runtime initialization failed
1765 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1766 warning("%s initialization failed. Shutting down all compilers", comp->name());
1767
1768 // Only one thread per compiler runtime object enters here
1769 // Set state to shut down
1770 comp->set_shut_down();
1771
1772 // Delete all queued compilation tasks to make compiler threads exit faster.
1773 if (_c1_compile_queue != NULL) {
1774 _c1_compile_queue->free_all();
1775 }
1776
1777 if (_c2_compile_queue != NULL) {
1778 _c2_compile_queue->free_all();
1779 }
1780
1781 // Set flags so that we continue execution with using interpreter only.
1782 UseCompiler = false;
1783 UseInterpreter = true;
1784
1785 // We could delete compiler runtimes also. However, there are references to
1786 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1787 // fail. This can be done later if necessary.
1788 }
1789 }
1790
1791 /**
1792 * Helper function to create new or reuse old CompileLog.
1793 */
1794 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1795 if (!LogCompilation) return NULL;
1796
1797 AbstractCompiler *compiler = ct->compiler();
1798 bool c1 = compiler->is_c1();
1799 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1800 assert(compiler_objects != NULL, "must be initialized at this point");
1801 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1802 assert(logs != NULL, "must be initialized at this point");
1803 int count = c1 ? _c1_count : _c2_count;
1804
1805 // Find Compiler number by its threadObj.
1806 oop compiler_obj = ct->threadObj();
1807 int compiler_number = 0;
1808 bool found = false;
1809 for (; compiler_number < count; compiler_number++) {
1810 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1811 found = true;
1812 break;
1813 }
1814 }
1815 assert(found, "Compiler must exist at this point");
1816
1817 // Determine pointer for this thread's log.
1818 CompileLog** log_ptr = &logs[compiler_number];
1819
1820 // Return old one if it exists.
1821 CompileLog* log = *log_ptr;
1822 if (log != NULL) {
1823 ct->init_log(log);
1824 return log;
1825 }
1826
1827 // Create a new one and remember it.
1828 init_compiler_thread_log();
1829 log = ct->log();
1830 *log_ptr = log;
1831 return log;
1832 }
1833
1834 // ------------------------------------------------------------------
1835 // CompileBroker::compiler_thread_loop
1836 //
1837 // The main loop run by a CompilerThread.
1838 void CompileBroker::compiler_thread_loop() {
1839 CompilerThread* thread = CompilerThread::current();
1840 CompileQueue* queue = thread->queue();
1841 // For the thread that initializes the ciObjectFactory
1842 // this resource mark holds all the shared objects
1843 ResourceMark rm;
1844
1845 // First thread to get here will initialize the compiler interface
1846
1847 {
1848 ASSERT_IN_VM;
1849 MutexLocker only_one (thread, CompileThread_lock);
1850 if (!ciObjectFactory::is_initialized()) {
1851 ciObjectFactory::initialize();
1852 }
1853 }
1854
1855 // Open a log.
1856 CompileLog* log = get_log(thread);
1857 if (log != NULL) {
1858 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1859 thread->name(),
1860 os::current_thread_id(),
1861 os::current_process_id());
1862 log->stamp();
1863 log->end_elem();
1864 }
1865
1866 // If compiler thread/runtime initialization fails, exit the compiler thread
1867 if (!init_compiler_runtime()) {
1868 return;
1869 }
1870
1871 thread->start_idle_timer();
1872
1873 // Poll for new compilation tasks as long as the JVM runs. Compilation
1874 // should only be disabled if something went wrong while initializing the
1875 // compiler runtimes. This, in turn, should not happen. The only known case
1876 // when compiler runtime initialization fails is if there is not enough free
1877 // space in the code cache to generate the necessary stubs, etc.
1878 while (!is_compilation_disabled_forever()) {
1879 // We need this HandleMark to avoid leaking VM handles.
1880 HandleMark hm(thread);
1881
1882 CompileTask* task = queue->get(thread);
1883 if (task == NULL) {
1884 if (UseDynamicNumberOfCompilerThreads) {
1885 // Access compiler_count under lock to enforce consistency.
1886 MutexLocker only_one(CompileThread_lock);
1887 if (can_remove(thread, true)) {
1888 if (TraceCompilerThreads) {
1889 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1890 thread->name(), thread->idle_time_millis());
1891 }
1892
1893 // Notify compiler that the compiler thread is about to stop
1894 thread->compiler()->stopping_compiler_thread(thread);
1895
1896 // Free buffer blob, if allocated
1897 if (thread->get_buffer_blob() != NULL) {
1898 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1899 CodeCache::free(thread->get_buffer_blob());
1900 }
1901 return; // Stop this thread.
1902 }
1903 }
1904 } else {
1905 // Assign the task to the current thread. Mark this compilation
1906 // thread as active for the profiler.
1907 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1908 // occurs after fetching the compile task off the queue.
1909 CompileTaskWrapper ctw(task);
1910 methodHandle method(thread, task->method());
1911
1912 // Never compile a method if breakpoints are present in it
1913 if (method()->number_of_breakpoints() == 0) {
1914 // Compile the method.
1915 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1916 invoke_compiler_on_method(task);
1917 thread->start_idle_timer();
1918 } else {
1919 // After compilation is disabled, remove remaining methods from queue
1920 method->clear_queued_for_compilation();
1921 task->set_failure_reason("compilation is disabled");
1922 }
1923 } else {
1924 task->set_failure_reason("breakpoints are present");
1925 }
1926
1927 if (UseDynamicNumberOfCompilerThreads) {
1928 possibly_add_compiler_threads(thread);
1929 assert(!thread->has_pending_exception(), "should have been handled");
1930 }
1931 }
1932 }
1933
1934 // Shut down compiler runtime
1935 shutdown_compiler_runtime(thread->compiler(), thread);
1936 }
1937
1938 // ------------------------------------------------------------------
1939 // CompileBroker::init_compiler_thread_log
1940 //
1941 // Set up state required by +LogCompilation.
1942 void CompileBroker::init_compiler_thread_log() {
1943 CompilerThread* thread = CompilerThread::current();
1944 char file_name[4*K];
1945 FILE* fp = NULL;
1946 intx thread_id = os::current_thread_id();
1947 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1948 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1949 if (dir == NULL) {
1950 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1951 thread_id, os::current_process_id());
1952 } else {
1953 jio_snprintf(file_name, sizeof(file_name),
1954 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1955 os::file_separator(), thread_id, os::current_process_id());
1956 }
1957
1958 fp = os::fopen(file_name, "wt");
1959 if (fp != NULL) {
1960 if (LogCompilation && Verbose) {
1961 tty->print_cr("Opening compilation log %s", file_name);
1962 }
1963 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1964 if (log == NULL) {
1965 fclose(fp);
1966 return;
1967 }
1968 thread->init_log(log);
1969
1970 if (xtty != NULL) {
1971 ttyLocker ttyl;
1972 // Record any per thread log files
1973 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1974 }
1975 return;
1976 }
1977 }
1978 warning("Cannot open log file: %s", file_name);
1979 }
1980
1981 void CompileBroker::log_metaspace_failure() {
1982 const char* message = "some methods may not be compiled because metaspace "
1983 "is out of memory";
1984 if (CompilationLog::log() != NULL) {
1985 CompilationLog::log()->log_metaspace_failure(message);
1986 }
1987 if (PrintCompilation) {
1988 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1989 }
1990 }
1991
1992
1993 // ------------------------------------------------------------------
1994 // CompileBroker::set_should_block
1995 //
1996 // Set _should_block.
1997 // Call this from the VM, with Threads_lock held and a safepoint requested.
1998 void CompileBroker::set_should_block() {
1999 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2000 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2001 #ifndef PRODUCT
2002 if (PrintCompilation && (Verbose || WizardMode))
2003 tty->print_cr("notifying compiler thread pool to block");
2004 #endif
2005 _should_block = true;
2006 }
2007
2008 // ------------------------------------------------------------------
2009 // CompileBroker::maybe_block
2010 //
2011 // Call this from the compiler at convenient points, to poll for _should_block.
2012 void CompileBroker::maybe_block() {
2013 if (_should_block) {
2014 #ifndef PRODUCT
2015 if (PrintCompilation && (Verbose || WizardMode))
2016 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2017 #endif
2018 ThreadInVMfromNative tivfn(JavaThread::current());
2019 }
2020 }
2021
2022 // wrapper for CodeCache::print_summary()
2023 static void codecache_print(bool detailed)
2024 {
2025 stringStream s;
2026 // Dump code cache into a buffer before locking the tty,
2027 {
2028 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2029 CodeCache::print_summary(&s, detailed);
2030 }
2031 ttyLocker ttyl;
2032 tty->print("%s", s.freeze());
2033 }
2034
2035 // wrapper for CodeCache::print_summary() using outputStream
2036 static void codecache_print(outputStream* out, bool detailed) {
2037 stringStream s;
2038
2039 // Dump code cache into a buffer
2040 {
2041 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2042 CodeCache::print_summary(&s, detailed);
2043 }
2044
2045 char* remaining_log = s.as_string();
2046 while (*remaining_log != '\0') {
2047 char* eol = strchr(remaining_log, '\n');
2048 if (eol == NULL) {
2049 out->print_cr("%s", remaining_log);
2050 remaining_log = remaining_log + strlen(remaining_log);
2051 } else {
2052 *eol = '\0';
2053 out->print_cr("%s", remaining_log);
2054 remaining_log = eol + 1;
2055 }
2056 }
2057 }
2058
2059 void CompileBroker::handle_compile_error(CompilerThread* thread, CompileTask* task, ciEnv* ci_env,
2060 int compilable, const char* failure_reason) {
2061 if (!AbortVMOnCompilationFailure) {
2062 return;
2063 }
2064 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2065 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2066 }
2067 if (compilable == ciEnv::MethodCompilable_never) {
2068 fatal("Never compilable: %s", failure_reason);
2069 }
2070 }
2071
2072 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2073 assert(task != NULL, "invariant");
2074 CompilerEvent::CompilationEvent::post(event,
2075 task->compile_id(),
2076 task->compiler()->type(),
2077 task->method(),
2078 task->comp_level(),
2079 task->is_success(),
2080 task->osr_bci() != CompileBroker::standard_entry_bci,
2081 task->nm_total_size(),
2082 task->num_inlined_bytecodes());
2083 }
2084
2085 int DirectivesStack::_depth = 0;
2086 CompilerDirectives* DirectivesStack::_top = NULL;
2087 CompilerDirectives* DirectivesStack::_bottom = NULL;
2088
2089 // ------------------------------------------------------------------
2090 // CompileBroker::invoke_compiler_on_method
2091 //
2092 // Compile a method.
2093 //
2094 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2095 task->print_ul();
2096 if (PrintCompilation) {
2097 ResourceMark rm;
2098 task->print_tty();
2099 }
2100 elapsedTimer time;
2101
2102 CompilerThread* thread = CompilerThread::current();
2103 ResourceMark rm(thread);
2104
2105 if (CompilationLog::log() != NULL) {
2106 CompilationLog::log()->log_compile(thread, task);
2107 }
2108
2109 // Common flags.
2110 uint compile_id = task->compile_id();
2111 int osr_bci = task->osr_bci();
2112 bool is_osr = (osr_bci != standard_entry_bci);
2113 bool should_log = (thread->log() != NULL);
2114 bool should_break = false;
2115 const int task_level = task->comp_level();
2116 AbstractCompiler* comp = task->compiler();
2117
2118 DirectiveSet* directive;
2119 {
2120 // create the handle inside it's own block so it can't
2121 // accidentally be referenced once the thread transitions to
2122 // native. The NoHandleMark before the transition should catch
2123 // any cases where this occurs in the future.
2124 methodHandle method(thread, task->method());
2125 assert(!method->is_native(), "no longer compile natives");
2126
2127 // Look up matching directives
2128 directive = DirectivesStack::getMatchingDirective(method, comp);
2129 task->set_directive(directive);
2130
2131 // Update compile information when using perfdata.
2132 if (UsePerfData) {
2133 update_compile_perf_data(thread, method, is_osr);
2134 }
2135
2136 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2137 }
2138
2139 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2140 if (should_log && !directive->LogOption) {
2141 should_log = false;
2142 }
2143
2144 // Allocate a new set of JNI handles.
2145 JNIHandleMark jhm(thread);
2146 Method* target_handle = task->method();
2147 int compilable = ciEnv::MethodCompilable;
2148 const char* failure_reason = NULL;
2149 bool failure_reason_on_C_heap = false;
2150 const char* retry_message = NULL;
2151
2152 #if INCLUDE_JVMCI
2153 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2154 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2155
2156 TraceTime t1("compilation", &time);
2157 EventCompilation event;
2158 JVMCICompileState compile_state(task, jvmci);
2159 JVMCIRuntime *runtime = NULL;
2160
2161 if (JVMCI::in_shutdown()) {
2162 failure_reason = "in JVMCI shutdown";
2163 retry_message = "not retryable";
2164 compilable = ciEnv::MethodCompilable_never;
2165 } else if (compile_state.target_method_is_old()) {
2166 // Skip redefined methods
2167 failure_reason = "redefined method";
2168 retry_message = "not retryable";
2169 compilable = ciEnv::MethodCompilable_never;
2170 } else {
2171 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2172 failure_reason = compile_state.failure_reason();
2173 if (failure_reason == nullptr) {
2174 methodHandle method(thread, target_handle);
2175 runtime = env.runtime();
2176 runtime->compile_method(&env, jvmci, method, osr_bci);
2177
2178 failure_reason = compile_state.failure_reason();
2179 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2180 if (!compile_state.retryable()) {
2181 retry_message = "not retryable";
2182 compilable = ciEnv::MethodCompilable_not_at_tier;
2183 }
2184 if (!task->is_success()) {
2185 assert(failure_reason != NULL, "must specify failure_reason");
2186 }
2187 }
2188 }
2189 if (!task->is_success()) {
2190 handle_compile_error(thread, task, NULL, compilable, failure_reason);
2191 }
2192 if (event.should_commit()) {
2193 post_compilation_event(event, task);
2194 }
2195
2196 if (runtime != nullptr) {
2197 runtime->post_compile(thread);
2198 }
2199 } else
2200 #endif // INCLUDE_JVMCI
2201 {
2202 NoHandleMark nhm;
2203 ThreadToNativeFromVM ttn(thread);
2204
2205 ciEnv ci_env(task);
2206 if (should_break) {
2207 ci_env.set_break_at_compile(true);
2208 }
2209 if (should_log) {
2210 ci_env.set_log(thread->log());
2211 }
2212 assert(thread->env() == &ci_env, "set by ci_env");
2213 // The thread-env() field is cleared in ~CompileTaskWrapper.
2214
2215 // Cache Jvmti state
2216 bool method_is_old = ci_env.cache_jvmti_state();
2217
2218 // Skip redefined methods
2219 if (method_is_old) {
2220 ci_env.record_method_not_compilable("redefined method", true);
2221 }
2222
2223 // Cache DTrace flags
2224 ci_env.cache_dtrace_flags();
2225
2226 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2227
2228 TraceTime t1("compilation", &time);
2229 EventCompilation event;
2230
2231 if (comp == NULL) {
2232 ci_env.record_method_not_compilable("no compiler");
2233 } else if (!ci_env.failing()) {
2234 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2235 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2236 while (WhiteBox::compilation_locked) {
2237 locker.wait();
2238 }
2239 }
2240 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2241
2242 /* Repeat compilation without installing code for profiling purposes */
2243 int repeat_compilation_count = directive->RepeatCompilationOption;
2244 while (repeat_compilation_count > 0) {
2245 ResourceMark rm(thread);
2246 task->print_ul("NO CODE INSTALLED");
2247 comp->compile_method(&ci_env, target, osr_bci, false, directive);
2248 repeat_compilation_count--;
2249 }
2250 }
2251
2252 DirectivesStack::release(directive);
2253
2254 if (!ci_env.failing() && !task->is_success()) {
2255 //assert(false, "compiler should always document failure");
2256 // The compiler elected, without comment, not to register a result.
2257 // Do not attempt further compilations of this method.
2258 ci_env.record_method_not_compilable("compile failed");
2259 }
2260
2261 // Copy this bit to the enclosing block:
2262 compilable = ci_env.compilable();
2263
2264 if (ci_env.failing()) {
2265 failure_reason = ci_env.failure_reason();
2266 retry_message = ci_env.retry_message();
2267 ci_env.report_failure(failure_reason);
2268 }
2269
2270 if (ci_env.failing()) {
2271 handle_compile_error(thread, task, &ci_env, compilable, failure_reason);
2272 }
2273 if (event.should_commit()) {
2274 post_compilation_event(event, task);
2275 }
2276 }
2277
2278 if (failure_reason != NULL) {
2279 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2280 if (CompilationLog::log() != NULL) {
2281 CompilationLog::log()->log_failure(thread, task, failure_reason, retry_message);
2282 }
2283 if (PrintCompilation) {
2284 FormatBufferResource msg = retry_message != NULL ?
2285 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2286 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2287 task->print(tty, msg);
2288 }
2289 }
2290
2291 methodHandle method(thread, task->method());
2292
2293 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2294
2295 collect_statistics(thread, time, task);
2296
2297 if (PrintCompilation && PrintCompilation2) {
2298 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2299 tty->print("%4d ", compile_id); // print compilation number
2300 tty->print("%s ", (is_osr ? "%" : " "));
2301 if (task->is_success()) {
2302 tty->print("size: %d(%d) ", task->nm_total_size(), task->nm_insts_size());
2303 }
2304 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2305 }
2306
2307 Log(compilation, codecache) log;
2308 if (log.is_debug()) {
2309 LogStream ls(log.debug());
2310 codecache_print(&ls, /* detailed= */ false);
2311 }
2312 if (PrintCodeCacheOnCompilation) {
2313 codecache_print(/* detailed= */ false);
2314 }
2315 // Disable compilation, if required.
2316 switch (compilable) {
2317 case ciEnv::MethodCompilable_never:
2318 if (is_osr)
2319 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2320 else
2321 method->set_not_compilable_quietly("MethodCompilable_never");
2322 break;
2323 case ciEnv::MethodCompilable_not_at_tier:
2324 if (is_osr)
2325 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2326 else
2327 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2328 break;
2329 }
2330
2331 // Note that the queued_for_compilation bits are cleared without
2332 // protection of a mutex. [They were set by the requester thread,
2333 // when adding the task to the compile queue -- at which time the
2334 // compile queue lock was held. Subsequently, we acquired the compile
2335 // queue lock to get this task off the compile queue; thus (to belabour
2336 // the point somewhat) our clearing of the bits must be occurring
2337 // only after the setting of the bits. See also 14012000 above.
2338 method->clear_queued_for_compilation();
2339 }
2340
2341 /**
2342 * The CodeCache is full. Print warning and disable compilation.
2343 * Schedule code cache cleaning so compilation can continue later.
2344 * This function needs to be called only from CodeCache::allocate(),
2345 * since we currently handle a full code cache uniformly.
2346 */
2347 void CompileBroker::handle_full_code_cache(CodeBlobType code_blob_type) {
2348 UseInterpreter = true;
2349 if (UseCompiler || AlwaysCompileLoopMethods ) {
2350 if (xtty != NULL) {
2351 stringStream s;
2352 // Dump code cache state into a buffer before locking the tty,
2353 // because log_state() will use locks causing lock conflicts.
2354 CodeCache::log_state(&s);
2355 // Lock to prevent tearing
2356 ttyLocker ttyl;
2357 xtty->begin_elem("code_cache_full");
2358 xtty->print("%s", s.freeze());
2359 xtty->stamp();
2360 xtty->end_elem();
2361 }
2362
2363 #ifndef PRODUCT
2364 if (ExitOnFullCodeCache) {
2365 codecache_print(/* detailed= */ true);
2366 before_exit(JavaThread::current());
2367 exit_globals(); // will delete tty
2368 vm_direct_exit(1);
2369 }
2370 #endif
2371 if (UseCodeCacheFlushing) {
2372 // Since code cache is full, immediately stop new compiles
2373 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2374 log_info(codecache)("Code cache is full - disabling compilation");
2375 }
2376 } else {
2377 disable_compilation_forever();
2378 }
2379
2380 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2381 }
2382 }
2383
2384 // ------------------------------------------------------------------
2385 // CompileBroker::update_compile_perf_data
2386 //
2387 // Record this compilation for debugging purposes.
2388 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2389 ResourceMark rm;
2390 char* method_name = method->name()->as_C_string();
2391 char current_method[CompilerCounters::cmname_buffer_length];
2392 size_t maxLen = CompilerCounters::cmname_buffer_length;
2393
2394 const char* class_name = method->method_holder()->name()->as_C_string();
2395
2396 size_t s1len = strlen(class_name);
2397 size_t s2len = strlen(method_name);
2398
2399 // check if we need to truncate the string
2400 if (s1len + s2len + 2 > maxLen) {
2401
2402 // the strategy is to lop off the leading characters of the
2403 // class name and the trailing characters of the method name.
2404
2405 if (s2len + 2 > maxLen) {
2406 // lop of the entire class name string, let snprintf handle
2407 // truncation of the method name.
2408 class_name += s1len; // null string
2409 }
2410 else {
2411 // lop off the extra characters from the front of the class name
2412 class_name += ((s1len + s2len + 2) - maxLen);
2413 }
2414 }
2415
2416 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2417
2418 int last_compile_type = normal_compile;
2419 if (CICountOSR && is_osr) {
2420 last_compile_type = osr_compile;
2421 } else if (CICountNative && method->is_native()) {
2422 last_compile_type = native_compile;
2423 }
2424
2425 CompilerCounters* counters = thread->counters();
2426 counters->set_current_method(current_method);
2427 counters->set_compile_type((jlong) last_compile_type);
2428 }
2429
2430 // ------------------------------------------------------------------
2431 // CompileBroker::collect_statistics
2432 //
2433 // Collect statistics about the compilation.
2434
2435 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2436 bool success = task->is_success();
2437 methodHandle method (thread, task->method());
2438 uint compile_id = task->compile_id();
2439 bool is_osr = (task->osr_bci() != standard_entry_bci);
2440 const int comp_level = task->comp_level();
2441 CompilerCounters* counters = thread->counters();
2442
2443 MutexLocker locker(CompileStatistics_lock);
2444
2445 // _perf variables are production performance counters which are
2446 // updated regardless of the setting of the CITime and CITimeEach flags
2447 //
2448
2449 // account all time, including bailouts and failures in this counter;
2450 // C1 and C2 counters are counting both successful and unsuccessful compiles
2451 _t_total_compilation.add(time);
2452
2453 if (!success) {
2454 _total_bailout_count++;
2455 if (UsePerfData) {
2456 _perf_last_failed_method->set_value(counters->current_method());
2457 _perf_last_failed_type->set_value(counters->compile_type());
2458 _perf_total_bailout_count->inc();
2459 }
2460 _t_bailedout_compilation.add(time);
2461 } else if (!task->is_success()) {
2462 if (UsePerfData) {
2463 _perf_last_invalidated_method->set_value(counters->current_method());
2464 _perf_last_invalidated_type->set_value(counters->compile_type());
2465 _perf_total_invalidated_count->inc();
2466 }
2467 _total_invalidated_count++;
2468 _t_invalidated_compilation.add(time);
2469 } else {
2470 // Compilation succeeded
2471
2472 // update compilation ticks - used by the implementation of
2473 // java.lang.management.CompilationMXBean
2474 _perf_total_compilation->inc(time.ticks());
2475 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2476
2477 if (CITime) {
2478 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2479 if (is_osr) {
2480 _t_osr_compilation.add(time);
2481 _sum_osr_bytes_compiled += bytes_compiled;
2482 } else {
2483 _t_standard_compilation.add(time);
2484 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2485 }
2486
2487 // Collect statistic per compilation level
2488 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2489 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2490 if (is_osr) {
2491 stats->_osr.update(time, bytes_compiled);
2492 } else {
2493 stats->_standard.update(time, bytes_compiled);
2494 }
2495 stats->_nmethods_size += task->nm_total_size();
2496 stats->_nmethods_code_size += task->nm_insts_size();
2497 } else {
2498 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2499 }
2500
2501 // Collect statistic per compiler
2502 AbstractCompiler* comp = compiler(comp_level);
2503 if (comp) {
2504 CompilerStatistics* stats = comp->stats();
2505 if (is_osr) {
2506 stats->_osr.update(time, bytes_compiled);
2507 } else {
2508 stats->_standard.update(time, bytes_compiled);
2509 }
2510 stats->_nmethods_size += task->nm_total_size();
2511 stats->_nmethods_code_size += task->nm_insts_size();
2512 } else { // if (!comp)
2513 assert(false, "Compiler object must exist");
2514 }
2515 }
2516
2517 if (UsePerfData) {
2518 // save the name of the last method compiled
2519 _perf_last_method->set_value(counters->current_method());
2520 _perf_last_compile_type->set_value(counters->compile_type());
2521 _perf_last_compile_size->set_value(method->code_size() +
2522 task->num_inlined_bytecodes());
2523 if (is_osr) {
2524 _perf_osr_compilation->inc(time.ticks());
2525 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2526 } else {
2527 _perf_standard_compilation->inc(time.ticks());
2528 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2529 }
2530 }
2531
2532 if (CITimeEach) {
2533 double compile_time = time.seconds();
2534 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2535 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2536 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2537 }
2538
2539 // Collect counts of successful compilations
2540 _sum_nmethod_size += task->nm_total_size();
2541 _sum_nmethod_code_size += task->nm_insts_size();
2542 _total_compile_count++;
2543
2544 if (UsePerfData) {
2545 _perf_sum_nmethod_size->inc( task->nm_total_size());
2546 _perf_sum_nmethod_code_size->inc(task->nm_insts_size());
2547 _perf_total_compile_count->inc();
2548 }
2549
2550 if (is_osr) {
2551 if (UsePerfData) _perf_total_osr_compile_count->inc();
2552 _total_osr_compile_count++;
2553 } else {
2554 if (UsePerfData) _perf_total_standard_compile_count->inc();
2555 _total_standard_compile_count++;
2556 }
2557 }
2558 // set the current method for the thread to null
2559 if (UsePerfData) counters->set_current_method("");
2560 }
2561
2562 const char* CompileBroker::compiler_name(int comp_level) {
2563 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2564 if (comp == NULL) {
2565 return "no compiler";
2566 } else {
2567 return (comp->name());
2568 }
2569 }
2570
2571 jlong CompileBroker::total_compilation_ticks() {
2572 return _perf_total_compilation != NULL ? _perf_total_compilation->get_value() : 0;
2573 }
2574
2575 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2576 tty->print_cr(" %s {speed: %6.3f bytes/s; standard: %6.3f s, %d bytes, %d methods; osr: %6.3f s, %d bytes, %d methods; nmethods_size: %d bytes; nmethods_code_size: %d bytes}",
2577 name, stats->bytes_per_second(),
2578 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2579 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2580 stats->_nmethods_size, stats->_nmethods_code_size);
2581 }
2582
2583 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2584 if (per_compiler) {
2585 if (aggregate) {
2586 tty->cr();
2587 tty->print_cr("Individual compiler times (for compiled methods only)");
2588 tty->print_cr("------------------------------------------------");
2589 tty->cr();
2590 }
2591 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2592 AbstractCompiler* comp = _compilers[i];
2593 if (comp != NULL) {
2594 print_times(comp->name(), comp->stats());
2595 }
2596 }
2597 if (aggregate) {
2598 tty->cr();
2599 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2600 tty->print_cr("------------------------------------------------");
2601 tty->cr();
2602 }
2603 char tier_name[256];
2604 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2605 CompilerStatistics* stats = &_stats_per_level[tier-1];
2606 sprintf(tier_name, "Tier%d", tier);
2607 print_times(tier_name, stats);
2608 }
2609 }
2610
2611 if (!aggregate) {
2612 return;
2613 }
2614
2615 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2616 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2617 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2618
2619 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2620 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2621
2622 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2623 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2624 int total_compile_count = CompileBroker::_total_compile_count;
2625 int total_bailout_count = CompileBroker::_total_bailout_count;
2626 int total_invalidated_count = CompileBroker::_total_invalidated_count;
2627
2628 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2629 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2630
2631 tty->cr();
2632 tty->print_cr("Accumulated compiler times");
2633 tty->print_cr("----------------------------------------------------------");
2634 //0000000000111111111122222222223333333333444444444455555555556666666666
2635 //0123456789012345678901234567890123456789012345678901234567890123456789
2636 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2637 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2638 standard_compilation.seconds(),
2639 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2640 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2641 CompileBroker::_t_bailedout_compilation.seconds(),
2642 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2643 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2644 osr_compilation.seconds(),
2645 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2646 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2647 CompileBroker::_t_invalidated_compilation.seconds(),
2648 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2649
2650 AbstractCompiler *comp = compiler(CompLevel_simple);
2651 if (comp != NULL) {
2652 tty->cr();
2653 comp->print_timers();
2654 }
2655 comp = compiler(CompLevel_full_optimization);
2656 if (comp != NULL) {
2657 tty->cr();
2658 comp->print_timers();
2659 }
2660 #if INCLUDE_JVMCI
2661 if (EnableJVMCI) {
2662 JVMCICompiler *jvmci_comp = JVMCICompiler::instance(false, JavaThread::current_or_null());
2663 if (jvmci_comp != nullptr && jvmci_comp != comp) {
2664 tty->cr();
2665 jvmci_comp->print_timers();
2666 }
2667 }
2668 #endif
2669
2670 tty->cr();
2671 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2672 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2673 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2674 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2675 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2676 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2677 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2678 double tcs = total_compilation.seconds();
2679 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2680 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2681 tty->cr();
2682 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2683 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2684 }
2685
2686 // Print general/accumulated JIT information.
2687 void CompileBroker::print_info(outputStream *out) {
2688 if (out == NULL) out = tty;
2689 out->cr();
2690 out->print_cr("======================");
2691 out->print_cr(" General JIT info ");
2692 out->print_cr("======================");
2693 out->cr();
2694 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2695 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2696 out->cr();
2697 out->print_cr("CodeCache overview");
2698 out->print_cr("--------------------------------------------------------");
2699 out->cr();
2700 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2701 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2702 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2703 out->cr();
2704 }
2705
2706 // Note: tty_lock must not be held upon entry to this function.
2707 // Print functions called from herein do "micro-locking" on tty_lock.
2708 // That's a tradeoff which keeps together important blocks of output.
2709 // At the same time, continuous tty_lock hold time is kept in check,
2710 // preventing concurrently printing threads from stalling a long time.
2711 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2712 TimeStamp ts_total;
2713 TimeStamp ts_global;
2714 TimeStamp ts;
2715
2716 bool allFun = !strcmp(function, "all");
2717 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2718 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2719 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2720 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2721 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2722 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2723 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2724 bool discard = !strcmp(function, "discard") || allFun;
2725
2726 if (out == NULL) {
2727 out = tty;
2728 }
2729
2730 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2731 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2732 out->cr();
2733 return;
2734 }
2735
2736 ts_total.update(); // record starting point
2737
2738 if (aggregate) {
2739 print_info(out);
2740 }
2741
2742 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2743 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2744 // When we request individual parts of the analysis via the jcmd interface, it is possible
2745 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2746 // updated the aggregated data. We will then see a modified, but again consistent, view
2747 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2748 // a lock across user interaction.
2749
2750 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2751 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2752 // leading to an unnecessarily long hold time of the other locks we acquired before.
2753 ts.update(); // record starting point
2754 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2755 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2756
2757 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2758 // Unfortunately, such protection is not sufficient:
2759 // When a new nmethod is created via ciEnv::register_method(), the
2760 // Compile_lock is taken first. After some initializations,
2761 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2762 // immediately (after finalizing the oop references). To lock out concurrent
2763 // modifiers, we have to grab both locks as well in the described sequence.
2764 //
2765 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2766 // for the entire duration of aggregation and printing. That makes sure we see
2767 // a consistent picture and do not run into issues caused by concurrent alterations.
2768 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2769 !Compile_lock->owned_by_self();
2770 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2771 !CodeCache_lock->owned_by_self();
2772 Mutex* global_lock_1 = allFun ? (should_take_Compile_lock ? Compile_lock : NULL) : NULL;
2773 Monitor* global_lock_2 = allFun ? (should_take_CodeCache_lock ? CodeCache_lock : NULL) : NULL;
2774 Mutex* function_lock_1 = allFun ? NULL : (should_take_Compile_lock ? Compile_lock : NULL);
2775 Monitor* function_lock_2 = allFun ? NULL : (should_take_CodeCache_lock ? CodeCache_lock : NULL);
2776 ts_global.update(); // record starting point
2777 MutexLocker mu1(global_lock_1, Mutex::_safepoint_check_flag);
2778 MutexLocker mu2(global_lock_2, Mutex::_no_safepoint_check_flag);
2779 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2780 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2781 ts_global.update(); // record starting point
2782 }
2783
2784 if (aggregate) {
2785 ts.update(); // record starting point
2786 MutexLocker mu11(function_lock_1, Mutex::_safepoint_check_flag);
2787 MutexLocker mu22(function_lock_2, Mutex::_no_safepoint_check_flag);
2788 if ((function_lock_1 != NULL) || (function_lock_1 != NULL)) {
2789 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2790 }
2791
2792 ts.update(); // record starting point
2793 CodeCache::aggregate(out, granularity);
2794 if ((function_lock_1 != NULL) || (function_lock_1 != NULL)) {
2795 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2796 }
2797 }
2798
2799 if (usedSpace) CodeCache::print_usedSpace(out);
2800 if (freeSpace) CodeCache::print_freeSpace(out);
2801 if (methodCount) CodeCache::print_count(out);
2802 if (methodSpace) CodeCache::print_space(out);
2803 if (methodAge) CodeCache::print_age(out);
2804 if (methodNames) {
2805 if (allFun) {
2806 // print_names() can only be used safely if the locks have been continuously held
2807 // since aggregation begin. That is true only for function "all".
2808 CodeCache::print_names(out);
2809 } else {
2810 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2811 }
2812 }
2813 if (discard) CodeCache::discard(out);
2814
2815 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2816 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2817 }
2818 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2819 }