1 /*
2 * Copyright (c) 1999, 2018, 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/symbolTable.hpp"
28 #include "classfile/systemDictionary.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/codeHeapState.hpp"
32 #include "code/dependencyContext.hpp"
33 #include "compiler/compileBroker.hpp"
34 #include "compiler/compileLog.hpp"
35 #include "compiler/compilerOracle.hpp"
36 #include "compiler/directivesParser.hpp"
37 #include "interpreter/linkResolver.hpp"
38 #include "jfr/jfrEvents.hpp"
39 #include "logging/log.hpp"
40 #include "logging/logStream.hpp"
41 #include "memory/allocation.inline.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "oops/methodData.hpp"
44 #include "oops/method.inline.hpp"
45 #include "oops/oop.inline.hpp"
46 #include "prims/nativeLookup.hpp"
47 #include "prims/whitebox.hpp"
48 #include "runtime/arguments.hpp"
49 #include "runtime/atomic.hpp"
50 #include "runtime/compilationPolicy.hpp"
51 #include "runtime/init.hpp"
52 #include "runtime/interfaceSupport.inline.hpp"
53 #include "runtime/javaCalls.hpp"
54 #include "runtime/jniHandles.inline.hpp"
55 #include "runtime/os.hpp"
56 #include "runtime/safepointVerifiers.hpp"
57 #include "runtime/sharedRuntime.hpp"
58 #include "runtime/sweeper.hpp"
59 #include "runtime/timerTrace.hpp"
60 #include "runtime/vframe.inline.hpp"
61 #include "utilities/debug.hpp"
62 #include "utilities/dtrace.hpp"
63 #include "utilities/events.hpp"
64 #include "utilities/formatBuffer.hpp"
65 #include "utilities/macros.hpp"
66 #ifdef COMPILER1
67 #include "c1/c1_Compiler.hpp"
68 #endif
69 #if INCLUDE_JVMCI
70 #include "jvmci/jvmciCompiler.hpp"
71 #include "jvmci/jvmciRuntime.hpp"
72 #include "jvmci/jvmciJavaClasses.hpp"
73 #include "runtime/vframe.hpp"
74 #endif
75 #ifdef COMPILER2
76 #include "opto/c2compiler.hpp"
77 #endif
78
79 #ifdef DTRACE_ENABLED
80
81 // Only bother with this argument setup if dtrace is available
82
83 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
84 { \
85 Symbol* klass_name = (method)->klass_name(); \
86 Symbol* name = (method)->name(); \
87 Symbol* signature = (method)->signature(); \
88 HOTSPOT_METHOD_COMPILE_BEGIN( \
89 (char *) comp_name, strlen(comp_name), \
90 (char *) klass_name->bytes(), klass_name->utf8_length(), \
91 (char *) name->bytes(), name->utf8_length(), \
92 (char *) signature->bytes(), signature->utf8_length()); \
93 }
94
95 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
96 { \
97 Symbol* klass_name = (method)->klass_name(); \
98 Symbol* name = (method)->name(); \
99 Symbol* signature = (method)->signature(); \
100 HOTSPOT_METHOD_COMPILE_END( \
101 (char *) comp_name, strlen(comp_name), \
102 (char *) klass_name->bytes(), klass_name->utf8_length(), \
103 (char *) name->bytes(), name->utf8_length(), \
104 (char *) signature->bytes(), signature->utf8_length(), (success)); \
105 }
106
107 #else // ndef DTRACE_ENABLED
108
109 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
110 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
111
112 #endif // ndef DTRACE_ENABLED
113
114 bool CompileBroker::_initialized = false;
115 volatile bool CompileBroker::_should_block = false;
116 volatile int CompileBroker::_print_compilation_warning = 0;
117 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
118
119 // The installed compiler(s)
120 AbstractCompiler* CompileBroker::_compilers[2];
121
122 // The maximum numbers of compiler threads to be determined during startup.
123 int CompileBroker::_c1_count = 0;
124 int CompileBroker::_c2_count = 0;
125
126 // An array of compiler names as Java String objects
127 jobject* CompileBroker::_compiler1_objects = NULL;
128 jobject* CompileBroker::_compiler2_objects = NULL;
129
130 CompileLog** CompileBroker::_compiler1_logs = NULL;
131 CompileLog** CompileBroker::_compiler2_logs = NULL;
132
133 // These counters are used to assign an unique ID to each compilation.
134 volatile jint CompileBroker::_compilation_id = 0;
135 volatile jint CompileBroker::_osr_compilation_id = 0;
136
137 // Debugging information
138 int CompileBroker::_last_compile_type = no_compile;
139 int CompileBroker::_last_compile_level = CompLevel_none;
140 char CompileBroker::_last_method_compiled[CompileBroker::name_buffer_length];
141
142 // Performance counters
143 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
144 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
145 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
146
147 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
148 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
149 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
150 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
151 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
152
153 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
154 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
155 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
156 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
157
158 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
159 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
160 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
161 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
162 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
163 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
164 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
165
166 // Timers and counters for generating statistics
167 elapsedTimer CompileBroker::_t_total_compilation;
168 elapsedTimer CompileBroker::_t_osr_compilation;
169 elapsedTimer CompileBroker::_t_standard_compilation;
170 elapsedTimer CompileBroker::_t_invalidated_compilation;
171 elapsedTimer CompileBroker::_t_bailedout_compilation;
172
173 int CompileBroker::_total_bailout_count = 0;
174 int CompileBroker::_total_invalidated_count = 0;
175 int CompileBroker::_total_compile_count = 0;
176 int CompileBroker::_total_osr_compile_count = 0;
177 int CompileBroker::_total_standard_compile_count = 0;
178 int CompileBroker::_total_compiler_stopped_count = 0;
179 int CompileBroker::_total_compiler_restarted_count = 0;
180
181 int CompileBroker::_sum_osr_bytes_compiled = 0;
182 int CompileBroker::_sum_standard_bytes_compiled = 0;
183 int CompileBroker::_sum_nmethod_size = 0;
184 int CompileBroker::_sum_nmethod_code_size = 0;
185
186 long CompileBroker::_peak_compilation_time = 0;
187
188 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
189 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
190
191
192
193 class CompilationLog : public StringEventLog {
194 public:
195 CompilationLog() : StringEventLog("Compilation events") {
196 }
197
198 void log_compile(JavaThread* thread, CompileTask* task) {
199 StringLogMessage lm;
200 stringStream sstr(lm.buffer(), lm.size());
201 // msg.time_stamp().update_to(tty->time_stamp().ticks());
202 task->print(&sstr, NULL, true, false);
203 log(thread, "%s", (const char*)lm);
204 }
205
206 void log_nmethod(JavaThread* thread, nmethod* nm) {
207 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
208 nm->compile_id(), nm->is_osr_method() ? "%" : "",
209 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
210 }
211
212 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
213 StringLogMessage lm;
214 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
215 if (retry_message != NULL) {
216 lm.append(" (%s)", retry_message);
217 }
218 lm.print("\n");
219 log(thread, "%s", (const char*)lm);
220 }
221
222 void log_metaspace_failure(const char* reason) {
223 ResourceMark rm;
224 StringLogMessage lm;
225 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
226 lm.print("\n");
227 log(JavaThread::current(), "%s", (const char*)lm);
228 }
229 };
230
231 static CompilationLog* _compilation_log = NULL;
232
233 bool compileBroker_init() {
234 if (LogEvents) {
235 _compilation_log = new CompilationLog();
236 }
237
238 // init directives stack, adding default directive
239 DirectivesStack::init();
240
241 if (DirectivesParser::has_file()) {
242 return DirectivesParser::parse_from_flag();
243 } else if (CompilerDirectivesPrint) {
244 // Print default directive even when no other was added
245 DirectivesStack::print(tty);
246 }
247
248 return true;
249 }
250
251 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
252 CompilerThread* thread = CompilerThread::current();
253 thread->set_task(task);
254 #if INCLUDE_JVMCI
255 if (task->is_blocking() && CompileBroker::compiler(task->comp_level())->is_jvmci()) {
256 task->set_jvmci_compiler_thread(thread);
257 }
258 #endif
259 CompileLog* log = thread->log();
260 if (log != NULL && !task->is_unloaded()) task->log_task_start(log);
261 }
262
263 CompileTaskWrapper::~CompileTaskWrapper() {
264 CompilerThread* thread = CompilerThread::current();
265 CompileTask* task = thread->task();
266 CompileLog* log = thread->log();
267 if (log != NULL && !task->is_unloaded()) task->log_task_done(log);
268 thread->set_task(NULL);
269 task->set_code_handle(NULL);
270 thread->set_env(NULL);
271 if (task->is_blocking()) {
272 bool free_task = false;
273 {
274 MutexLocker notifier(task->lock(), thread);
275 task->mark_complete();
276 #if INCLUDE_JVMCI
277 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
278 if (!task->has_waiter()) {
279 // The waiting thread timed out and thus did not free the task.
280 free_task = true;
281 }
282 task->set_jvmci_compiler_thread(NULL);
283 }
284 #endif
285 if (!free_task) {
286 // Notify the waiting thread that the compilation has completed
287 // so that it can free the task.
288 task->lock()->notify_all();
289 }
290 }
291 if (free_task) {
292 // The task can only be freed once the task lock is released.
293 CompileTask::free(task);
294 }
295 } else {
296 task->mark_complete();
297
298 // By convention, the compiling thread is responsible for
299 // recycling a non-blocking CompileTask.
300 CompileTask::free(task);
301 }
302 }
303
304 /**
305 * Check if a CompilerThread can be removed and update count if requested.
306 */
307 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
308 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
309 if (!ReduceNumberOfCompilerThreads) return false;
310
311 AbstractCompiler *compiler = ct->compiler();
312 int compiler_count = compiler->num_compiler_threads();
313 bool c1 = compiler->is_c1();
314
315 // Keep at least 1 compiler thread of each type.
316 if (compiler_count < 2) return false;
317
318 // Keep thread alive for at least some time.
319 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
320
321 #if INCLUDE_JVMCI
322 if (compiler->is_jvmci()) {
323 // Handles for JVMCI thread objects may get released concurrently.
324 if (do_it) {
325 assert(CompileThread_lock->owner() == ct, "must be holding lock");
326 } else {
327 // Skip check if it's the last thread and let caller check again.
328 return true;
329 }
330 }
331 #endif
332
333 // We only allow the last compiler thread of each type to get removed.
334 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
335 : compiler2_object(compiler_count - 1);
336 if (oopDesc::equals(ct->threadObj(), JNIHandles::resolve_non_null(last_compiler))) {
337 if (do_it) {
338 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
339 compiler->set_num_compiler_threads(compiler_count - 1);
340 #if INCLUDE_JVMCI
341 if (compiler->is_jvmci()) {
342 // Old j.l.Thread object can die when no longer referenced elsewhere.
343 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
344 _compiler2_objects[compiler_count - 1] = NULL;
345 }
346 #endif
347 }
348 return true;
349 }
350 return false;
351 }
352
353 /**
354 * Add a CompileTask to a CompileQueue.
355 */
356 void CompileQueue::add(CompileTask* task) {
357 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
358
359 task->set_next(NULL);
360 task->set_prev(NULL);
361
362 if (_last == NULL) {
363 // The compile queue is empty.
364 assert(_first == NULL, "queue is empty");
365 _first = task;
366 _last = task;
367 } else {
368 // Append the task to the queue.
369 assert(_last->next() == NULL, "not last");
370 _last->set_next(task);
371 task->set_prev(_last);
372 _last = task;
373 }
374 ++_size;
375
376 // Mark the method as being in the compile queue.
377 task->method()->set_queued_for_compilation();
378
379 if (CIPrintCompileQueue) {
380 print_tty();
381 }
382
383 if (LogCompilation && xtty != NULL) {
384 task->log_task_queued();
385 }
386
387 // Notify CompilerThreads that a task is available.
388 MethodCompileQueue_lock->notify_all();
389 }
390
391 /**
392 * Empties compilation queue by putting all compilation tasks onto
393 * a freelist. Furthermore, the method wakes up all threads that are
394 * waiting on a compilation task to finish. This can happen if background
395 * compilation is disabled.
396 */
397 void CompileQueue::free_all() {
398 MutexLocker mu(MethodCompileQueue_lock);
399 CompileTask* next = _first;
400
401 // Iterate over all tasks in the compile queue
402 while (next != NULL) {
403 CompileTask* current = next;
404 next = current->next();
405 {
406 // Wake up thread that blocks on the compile task.
407 MutexLocker ct_lock(current->lock());
408 current->lock()->notify();
409 }
410 // Put the task back on the freelist.
411 CompileTask::free(current);
412 }
413 _first = NULL;
414
415 // Wake up all threads that block on the queue.
416 MethodCompileQueue_lock->notify_all();
417 }
418
419 /**
420 * Get the next CompileTask from a CompileQueue
421 */
422 CompileTask* CompileQueue::get() {
423 // save methods from RedefineClasses across safepoint
424 // across MethodCompileQueue_lock below.
425 methodHandle save_method;
426 methodHandle save_hot_method;
427
428 MutexLocker locker(MethodCompileQueue_lock);
429 // If _first is NULL we have no more compile jobs. There are two reasons for
430 // having no compile jobs: First, we compiled everything we wanted. Second,
431 // we ran out of code cache so compilation has been disabled. In the latter
432 // case we perform code cache sweeps to free memory such that we can re-enable
433 // compilation.
434 while (_first == NULL) {
435 // Exit loop if compilation is disabled forever
436 if (CompileBroker::is_compilation_disabled_forever()) {
437 return NULL;
438 }
439
440 // If there are no compilation tasks and we can compile new jobs
441 // (i.e., there is enough free space in the code cache) there is
442 // no need to invoke the sweeper. As a result, the hotness of methods
443 // remains unchanged. This behavior is desired, since we want to keep
444 // the stable state, i.e., we do not want to evict methods from the
445 // code cache if it is unnecessary.
446 // We need a timed wait here, since compiler threads can exit if compilation
447 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
448 // is not critical and we do not want idle compiler threads to wake up too often.
449 MethodCompileQueue_lock->wait(!Mutex::_no_safepoint_check_flag, 5*1000);
450
451 if (UseDynamicNumberOfCompilerThreads && _first == NULL) {
452 // Still nothing to compile. Give caller a chance to stop this thread.
453 if (CompileBroker::can_remove(CompilerThread::current(), false)) return NULL;
454 }
455 }
456
457 if (CompileBroker::is_compilation_disabled_forever()) {
458 return NULL;
459 }
460
461 CompileTask* task;
462 {
463 NoSafepointVerifier nsv;
464 task = CompilationPolicy::policy()->select_task(this);
465 if (task != NULL) {
466 task = task->select_for_compilation();
467 }
468 }
469
470 if (task != NULL) {
471 // Save method pointers across unlock safepoint. The task is removed from
472 // the compilation queue, which is walked during RedefineClasses.
473 save_method = methodHandle(task->method());
474 save_hot_method = methodHandle(task->hot_method());
475
476 remove(task);
477 }
478 purge_stale_tasks(); // may temporarily release MCQ lock
479 return task;
480 }
481
482 // Clean & deallocate stale compile tasks.
483 // Temporarily releases MethodCompileQueue lock.
484 void CompileQueue::purge_stale_tasks() {
485 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
486 if (_first_stale != NULL) {
487 // Stale tasks are purged when MCQ lock is released,
488 // but _first_stale updates are protected by MCQ lock.
489 // Once task processing starts and MCQ lock is released,
490 // other compiler threads can reuse _first_stale.
491 CompileTask* head = _first_stale;
492 _first_stale = NULL;
493 {
494 MutexUnlocker ul(MethodCompileQueue_lock);
495 for (CompileTask* task = head; task != NULL; ) {
496 CompileTask* next_task = task->next();
497 CompileTaskWrapper ctw(task); // Frees the task
498 task->set_failure_reason("stale task");
499 task = next_task;
500 }
501 }
502 }
503 }
504
505 void CompileQueue::remove(CompileTask* task) {
506 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
507 if (task->prev() != NULL) {
508 task->prev()->set_next(task->next());
509 } else {
510 // max is the first element
511 assert(task == _first, "Sanity");
512 _first = task->next();
513 }
514
515 if (task->next() != NULL) {
516 task->next()->set_prev(task->prev());
517 } else {
518 // max is the last element
519 assert(task == _last, "Sanity");
520 _last = task->prev();
521 }
522 --_size;
523 }
524
525 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
526 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
527 remove(task);
528
529 // Enqueue the task for reclamation (should be done outside MCQ lock)
530 task->set_next(_first_stale);
531 task->set_prev(NULL);
532 _first_stale = task;
533 }
534
535 // methods in the compile queue need to be marked as used on the stack
536 // so that they don't get reclaimed by Redefine Classes
537 void CompileQueue::mark_on_stack() {
538 CompileTask* task = _first;
539 while (task != NULL) {
540 task->mark_on_stack();
541 task = task->next();
542 }
543 }
544
545
546 CompileQueue* CompileBroker::compile_queue(int comp_level) {
547 if (is_c2_compile(comp_level)) return _c2_compile_queue;
548 if (is_c1_compile(comp_level)) return _c1_compile_queue;
549 return NULL;
550 }
551
552 void CompileBroker::print_compile_queues(outputStream* st) {
553 st->print_cr("Current compiles: ");
554
555 char buf[2000];
556 int buflen = sizeof(buf);
557 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
558
559 st->cr();
560 if (_c1_compile_queue != NULL) {
561 _c1_compile_queue->print(st);
562 }
563 if (_c2_compile_queue != NULL) {
564 _c2_compile_queue->print(st);
565 }
566 }
567
568 void CompileQueue::print(outputStream* st) {
569 assert_locked_or_safepoint(MethodCompileQueue_lock);
570 st->print_cr("%s:", name());
571 CompileTask* task = _first;
572 if (task == NULL) {
573 st->print_cr("Empty");
574 } else {
575 while (task != NULL) {
576 task->print(st, NULL, true, true);
577 task = task->next();
578 }
579 }
580 st->cr();
581 }
582
583 void CompileQueue::print_tty() {
584 ResourceMark rm;
585 stringStream ss;
586 // Dump the compile queue into a buffer before locking the tty
587 print(&ss);
588 {
589 ttyLocker ttyl;
590 tty->print("%s", ss.as_string());
591 }
592 }
593
594 CompilerCounters::CompilerCounters() {
595 _current_method[0] = '\0';
596 _compile_type = CompileBroker::no_compile;
597 }
598
599 // ------------------------------------------------------------------
600 // CompileBroker::compilation_init
601 //
602 // Initialize the Compilation object
603 void CompileBroker::compilation_init_phase1(TRAPS) {
604 _last_method_compiled[0] = '\0';
605
606 // No need to initialize compilation system if we do not use it.
607 if (!UseCompiler) {
608 return;
609 }
610 // Set the interface to the current compiler(s).
611 _c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
612 _c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
613
614 #if INCLUDE_JVMCI
615 if (EnableJVMCI) {
616 // This is creating a JVMCICompiler singleton.
617 JVMCICompiler* jvmci = new JVMCICompiler();
618
619 if (UseJVMCICompiler) {
620 _compilers[1] = jvmci;
621 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
622 if (BootstrapJVMCI) {
623 // JVMCI will bootstrap so give it more threads
624 _c2_count = MIN2(32, os::active_processor_count());
625 }
626 } else {
627 _c2_count = JVMCIThreads;
628 }
629 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
630 } else {
631 _c1_count = JVMCIHostThreads;
632 }
633 }
634 }
635 #endif // INCLUDE_JVMCI
636
637 #ifdef COMPILER1
638 if (_c1_count > 0) {
639 _compilers[0] = new Compiler();
640 }
641 #endif // COMPILER1
642
643 #ifdef COMPILER2
644 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
645 if (_c2_count > 0) {
646 _compilers[1] = new C2Compiler();
647 }
648 }
649 #endif // COMPILER2
650
651 // Start the compiler thread(s) and the sweeper thread
652 init_compiler_sweeper_threads();
653 // totalTime performance counter is always created as it is required
654 // by the implementation of java.lang.management.CompilationMBean.
655 {
656 EXCEPTION_MARK;
657 _perf_total_compilation =
658 PerfDataManager::create_counter(JAVA_CI, "totalTime",
659 PerfData::U_Ticks, CHECK);
660 }
661
662 if (UsePerfData) {
663
664 EXCEPTION_MARK;
665
666 // create the jvmstat performance counters
667 _perf_osr_compilation =
668 PerfDataManager::create_counter(SUN_CI, "osrTime",
669 PerfData::U_Ticks, CHECK);
670
671 _perf_standard_compilation =
672 PerfDataManager::create_counter(SUN_CI, "standardTime",
673 PerfData::U_Ticks, CHECK);
674
675 _perf_total_bailout_count =
676 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
677 PerfData::U_Events, CHECK);
678
679 _perf_total_invalidated_count =
680 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
681 PerfData::U_Events, CHECK);
682
683 _perf_total_compile_count =
684 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
685 PerfData::U_Events, CHECK);
686 _perf_total_osr_compile_count =
687 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
688 PerfData::U_Events, CHECK);
689
690 _perf_total_standard_compile_count =
691 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
692 PerfData::U_Events, CHECK);
693
694 _perf_sum_osr_bytes_compiled =
695 PerfDataManager::create_counter(SUN_CI, "osrBytes",
696 PerfData::U_Bytes, CHECK);
697
698 _perf_sum_standard_bytes_compiled =
699 PerfDataManager::create_counter(SUN_CI, "standardBytes",
700 PerfData::U_Bytes, CHECK);
701
702 _perf_sum_nmethod_size =
703 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
704 PerfData::U_Bytes, CHECK);
705
706 _perf_sum_nmethod_code_size =
707 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
708 PerfData::U_Bytes, CHECK);
709
710 _perf_last_method =
711 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
712 CompilerCounters::cmname_buffer_length,
713 "", CHECK);
714
715 _perf_last_failed_method =
716 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
717 CompilerCounters::cmname_buffer_length,
718 "", CHECK);
719
720 _perf_last_invalidated_method =
721 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
722 CompilerCounters::cmname_buffer_length,
723 "", CHECK);
724
725 _perf_last_compile_type =
726 PerfDataManager::create_variable(SUN_CI, "lastType",
727 PerfData::U_None,
728 (jlong)CompileBroker::no_compile,
729 CHECK);
730
731 _perf_last_compile_size =
732 PerfDataManager::create_variable(SUN_CI, "lastSize",
733 PerfData::U_Bytes,
734 (jlong)CompileBroker::no_compile,
735 CHECK);
736
737
738 _perf_last_failed_type =
739 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
740 PerfData::U_None,
741 (jlong)CompileBroker::no_compile,
742 CHECK);
743
744 _perf_last_invalidated_type =
745 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
746 PerfData::U_None,
747 (jlong)CompileBroker::no_compile,
748 CHECK);
749 }
750 }
751
752 // Completes compiler initialization. Compilation requests submitted
753 // prior to this will be silently ignored.
754 void CompileBroker::compilation_init_phase2() {
755 _initialized = true;
756 }
757
758 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
759 Handle string = java_lang_String::create_from_str(name, CHECK_NH);
760 Handle thread_group(THREAD, Universe::system_thread_group());
761 return JavaCalls::construct_new_instance(
762 SystemDictionary::Thread_klass(),
763 vmSymbols::threadgroup_string_void_signature(),
764 thread_group,
765 string,
766 CHECK_NH);
767 }
768
769
770 JavaThread* CompileBroker::make_thread(jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, TRAPS) {
771 JavaThread* thread = NULL;
772 {
773 MutexLocker mu(Threads_lock, THREAD);
774 if (comp != NULL) {
775 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
776 CompilerCounters* counters = new CompilerCounters();
777 thread = new CompilerThread(queue, counters);
778 }
779 } else {
780 thread = new CodeCacheSweeperThread();
781 }
782 // At this point the new CompilerThread data-races with this startup
783 // thread (which I believe is the primoridal thread and NOT the VM
784 // thread). This means Java bytecodes being executed at startup can
785 // queue compile jobs which will run at whatever default priority the
786 // newly created CompilerThread runs at.
787
788
789 // At this point it may be possible that no osthread was created for the
790 // JavaThread due to lack of memory. We would have to throw an exception
791 // in that case. However, since this must work and we do not allow
792 // exceptions anyway, check and abort if this fails. But first release the
793 // lock.
794
795 if (thread != NULL && thread->osthread() != NULL) {
796
797 java_lang_Thread::set_thread(JNIHandles::resolve_non_null(thread_handle), thread);
798
799 // Note that this only sets the JavaThread _priority field, which by
800 // definition is limited to Java priorities and not OS priorities.
801 // The os-priority is set in the CompilerThread startup code itself
802
803 java_lang_Thread::set_priority(JNIHandles::resolve_non_null(thread_handle), NearMaxPriority);
804
805 // Note that we cannot call os::set_priority because it expects Java
806 // priorities and we are *explicitly* using OS priorities so that it's
807 // possible to set the compiler thread priority higher than any Java
808 // thread.
809
810 int native_prio = CompilerThreadPriority;
811 if (native_prio == -1) {
812 if (UseCriticalCompilerThreadPriority) {
813 native_prio = os::java_to_os_priority[CriticalPriority];
814 } else {
815 native_prio = os::java_to_os_priority[NearMaxPriority];
816 }
817 }
818 os::set_native_priority(thread, native_prio);
819
820 java_lang_Thread::set_daemon(JNIHandles::resolve_non_null(thread_handle));
821
822 thread->set_threadObj(JNIHandles::resolve_non_null(thread_handle));
823 if (comp != NULL) {
824 thread->as_CompilerThread()->set_compiler(comp);
825 }
826 Threads::add(thread);
827 Thread::start(thread);
828 }
829 }
830
831 // First release lock before aborting VM.
832 if (thread == NULL || thread->osthread() == NULL) {
833 if (UseDynamicNumberOfCompilerThreads && comp != NULL && comp->num_compiler_threads() > 0) {
834 if (thread != NULL) {
835 thread->smr_delete();
836 }
837 return NULL;
838 }
839 vm_exit_during_initialization("java.lang.OutOfMemoryError",
840 os::native_thread_creation_failed_msg());
841 }
842
843 // Let go of Threads_lock before yielding
844 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
845
846 return thread;
847 }
848
849
850 void CompileBroker::init_compiler_sweeper_threads() {
851 EXCEPTION_MARK;
852 #if !defined(ZERO)
853 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
854 #endif // !ZERO
855 // Initialize the compilation queue
856 if (_c2_count > 0) {
857 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
858 _c2_compile_queue = new CompileQueue(name);
859 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
860 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
861 }
862 if (_c1_count > 0) {
863 _c1_compile_queue = new CompileQueue("C1 compile queue");
864 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
865 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
866 }
867
868 char name_buffer[256];
869
870 for (int i = 0; i < _c2_count; i++) {
871 jobject thread_handle = NULL;
872 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
873 // for JVMCI compiler which can create further ones on demand.
874 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
875 // Create a name for our thread.
876 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
877 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
878 thread_handle = JNIHandles::make_global(thread_oop);
879 JVMCI_ONLY(})
880 _compiler2_objects[i] = thread_handle;
881 _compiler2_logs[i] = NULL;
882
883 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
884 JavaThread *ct = make_thread(thread_handle, _c2_compile_queue, _compilers[1], CHECK);
885 assert(ct != NULL, "should have been handled for initial thread");
886 _compilers[1]->set_num_compiler_threads(i + 1);
887 if (TraceCompilerThreads) {
888 ResourceMark rm;
889 MutexLocker mu(Threads_lock);
890 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
891 }
892 }
893 }
894
895 for (int i = 0; i < _c1_count; i++) {
896 // Create a name for our thread.
897 sprintf(name_buffer, "C1 CompilerThread%d", i);
898 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
899 jobject thread_handle = JNIHandles::make_global(thread_oop);
900 _compiler1_objects[i] = thread_handle;
901 _compiler1_logs[i] = NULL;
902
903 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
904 JavaThread *ct = make_thread(thread_handle, _c1_compile_queue, _compilers[0], CHECK);
905 assert(ct != NULL, "should have been handled for initial thread");
906 _compilers[0]->set_num_compiler_threads(i + 1);
907 if (TraceCompilerThreads) {
908 ResourceMark rm;
909 MutexLocker mu(Threads_lock);
910 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
911 }
912 }
913 }
914
915 if (UsePerfData) {
916 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
917 }
918
919 if (MethodFlushing) {
920 // Initialize the sweeper thread
921 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK);
922 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
923 make_thread(thread_handle, NULL, NULL, CHECK);
924 }
925 }
926
927 void CompileBroker::possibly_add_compiler_threads() {
928 EXCEPTION_MARK;
929
930 julong available_memory = os::available_memory();
931 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
932 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
933 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
934
935 // Only do attempt to start additional threads if the lock is free.
936 if (!CompileThread_lock->try_lock()) return;
937
938 if (_c2_compile_queue != NULL) {
939 int old_c2_count = _compilers[1]->num_compiler_threads();
940 int new_c2_count = MIN4(_c2_count,
941 _c2_compile_queue->size() / 2,
942 (int)(available_memory / (200*M)),
943 (int)(available_cc_np / (128*K)));
944
945 for (int i = old_c2_count; i < new_c2_count; i++) {
946 #if INCLUDE_JVMCI
947 if (UseJVMCICompiler) {
948 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
949 // objects as their existence is completely hidden from the rest of
950 // the VM (and those compiler threads can't call Java code to do the
951 // creation anyway). For JVMCI we have to create new j.l.Thread objects
952 // as they are visible and we can see unexpected thread lifecycle
953 // transitions if we bind them to new JavaThreads.
954 if (!THREAD->can_call_java()) break;
955 char name_buffer[256];
956 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
957 Handle thread_oop;
958 {
959 // We have to give up the lock temporarily for the Java calls.
960 MutexUnlocker mu(CompileThread_lock);
961 thread_oop = create_thread_oop(name_buffer, THREAD);
962 }
963 if (HAS_PENDING_EXCEPTION) {
964 if (TraceCompilerThreads) {
965 ResourceMark rm;
966 tty->print_cr("JVMCI compiler thread creation failed:");
967 PENDING_EXCEPTION->print();
968 }
969 CLEAR_PENDING_EXCEPTION;
970 break;
971 }
972 // Check if another thread has beaten us during the Java calls.
973 if (_compilers[1]->num_compiler_threads() != i) break;
974 jobject thread_handle = JNIHandles::make_global(thread_oop);
975 assert(compiler2_object(i) == NULL, "Old one must be released!");
976 _compiler2_objects[i] = thread_handle;
977 }
978 #endif
979 JavaThread *ct = make_thread(compiler2_object(i), _c2_compile_queue, _compilers[1], CHECK);
980 if (ct == NULL) break;
981 _compilers[1]->set_num_compiler_threads(i + 1);
982 if (TraceCompilerThreads) {
983 ResourceMark rm;
984 MutexLocker mu(Threads_lock);
985 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
986 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M));
987 }
988 }
989 }
990
991 if (_c1_compile_queue != NULL) {
992 int old_c1_count = _compilers[0]->num_compiler_threads();
993 int new_c1_count = MIN4(_c1_count,
994 _c1_compile_queue->size() / 4,
995 (int)(available_memory / (100*M)),
996 (int)(available_cc_p / (128*K)));
997
998 for (int i = old_c1_count; i < new_c1_count; i++) {
999 JavaThread *ct = make_thread(compiler1_object(i), _c1_compile_queue, _compilers[0], CHECK);
1000 if (ct == NULL) break;
1001 _compilers[0]->set_num_compiler_threads(i + 1);
1002 if (TraceCompilerThreads) {
1003 ResourceMark rm;
1004 MutexLocker mu(Threads_lock);
1005 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
1006 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M));
1007 }
1008 }
1009 }
1010
1011 CompileThread_lock->unlock();
1012 }
1013
1014
1015 /**
1016 * Set the methods on the stack as on_stack so that redefine classes doesn't
1017 * reclaim them. This method is executed at a safepoint.
1018 */
1019 void CompileBroker::mark_on_stack() {
1020 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1021 // Since we are at a safepoint, we do not need a lock to access
1022 // the compile queues.
1023 if (_c2_compile_queue != NULL) {
1024 _c2_compile_queue->mark_on_stack();
1025 }
1026 if (_c1_compile_queue != NULL) {
1027 _c1_compile_queue->mark_on_stack();
1028 }
1029 }
1030
1031 // ------------------------------------------------------------------
1032 // CompileBroker::compile_method
1033 //
1034 // Request compilation of a method.
1035 void CompileBroker::compile_method_base(const methodHandle& method,
1036 int osr_bci,
1037 int comp_level,
1038 const methodHandle& hot_method,
1039 int hot_count,
1040 CompileTask::CompileReason compile_reason,
1041 bool blocking,
1042 Thread* thread) {
1043 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1044 assert(method->method_holder()->is_instance_klass(),
1045 "sanity check");
1046 assert(!method->method_holder()->is_not_initialized(),
1047 "method holder must be initialized");
1048 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1049
1050 if (CIPrintRequests) {
1051 tty->print("request: ");
1052 method->print_short_name(tty);
1053 if (osr_bci != InvocationEntryBci) {
1054 tty->print(" osr_bci: %d", osr_bci);
1055 }
1056 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1057 if (!hot_method.is_null()) {
1058 tty->print(" hot: ");
1059 if (hot_method() != method()) {
1060 hot_method->print_short_name(tty);
1061 } else {
1062 tty->print("yes");
1063 }
1064 }
1065 tty->cr();
1066 }
1067
1068 // A request has been made for compilation. Before we do any
1069 // real work, check to see if the method has been compiled
1070 // in the meantime with a definitive result.
1071 if (compilation_is_complete(method, osr_bci, comp_level)) {
1072 return;
1073 }
1074
1075 #ifndef PRODUCT
1076 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1077 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1078 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1079 return;
1080 }
1081 }
1082 #endif
1083
1084 // If this method is already in the compile queue, then
1085 // we do not block the current thread.
1086 if (compilation_is_in_queue(method)) {
1087 // We may want to decay our counter a bit here to prevent
1088 // multiple denied requests for compilation. This is an
1089 // open compilation policy issue. Note: The other possibility,
1090 // in the case that this is a blocking compile request, is to have
1091 // all subsequent blocking requesters wait for completion of
1092 // ongoing compiles. Note that in this case we'll need a protocol
1093 // for freeing the associated compile tasks. [Or we could have
1094 // a single static monitor on which all these waiters sleep.]
1095 return;
1096 }
1097
1098 if (TieredCompilation) {
1099 // Tiered policy requires MethodCounters to exist before adding a method to
1100 // the queue. Create if we don't have them yet.
1101 method->get_method_counters(thread);
1102 }
1103
1104 // Outputs from the following MutexLocker block:
1105 CompileTask* task = NULL;
1106 CompileQueue* queue = compile_queue(comp_level);
1107
1108 // Acquire our lock.
1109 {
1110 MutexLocker locker(MethodCompileQueue_lock, thread);
1111
1112 // Make sure the method has not slipped into the queues since
1113 // last we checked; note that those checks were "fast bail-outs".
1114 // Here we need to be more careful, see 14012000 below.
1115 if (compilation_is_in_queue(method)) {
1116 return;
1117 }
1118
1119 // We need to check again to see if the compilation has
1120 // completed. A previous compilation may have registered
1121 // some result.
1122 if (compilation_is_complete(method, osr_bci, comp_level)) {
1123 return;
1124 }
1125
1126 // We now know that this compilation is not pending, complete,
1127 // or prohibited. Assign a compile_id to this compilation
1128 // and check to see if it is in our [Start..Stop) range.
1129 int compile_id = assign_compile_id(method, osr_bci);
1130 if (compile_id == 0) {
1131 // The compilation falls outside the allowed range.
1132 return;
1133 }
1134
1135 #if INCLUDE_JVMCI
1136 if (UseJVMCICompiler) {
1137 if (blocking) {
1138 // Don't allow blocking compiles for requests triggered by JVMCI.
1139 if (thread->is_Compiler_thread()) {
1140 blocking = false;
1141 }
1142
1143 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1144 vframeStream vfst((JavaThread*) thread);
1145 for (; !vfst.at_end(); vfst.next()) {
1146 if (vfst.method()->is_static_initializer() ||
1147 (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) &&
1148 vfst.method()->name() == vmSymbols::loadClass_name())) {
1149 blocking = false;
1150 break;
1151 }
1152 }
1153
1154 // Don't allow blocking compilation requests to JVMCI
1155 // if JVMCI itself is not yet initialized
1156 if (!JVMCIRuntime::is_HotSpotJVMCIRuntime_initialized() && compiler(comp_level)->is_jvmci()) {
1157 blocking = false;
1158 }
1159
1160 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1161 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1162 // such as the DestroyJavaVM thread.
1163 if (JVMCIRuntime::shutdown_called()) {
1164 blocking = false;
1165 }
1166 }
1167 }
1168 #endif // INCLUDE_JVMCI
1169
1170 // We will enter the compilation in the queue.
1171 // 14012000: Note that this sets the queued_for_compile bits in
1172 // the target method. We can now reason that a method cannot be
1173 // queued for compilation more than once, as follows:
1174 // Before a thread queues a task for compilation, it first acquires
1175 // the compile queue lock, then checks if the method's queued bits
1176 // are set or it has already been compiled. Thus there can not be two
1177 // instances of a compilation task for the same method on the
1178 // compilation queue. Consider now the case where the compilation
1179 // thread has already removed a task for that method from the queue
1180 // and is in the midst of compiling it. In this case, the
1181 // queued_for_compile bits must be set in the method (and these
1182 // will be visible to the current thread, since the bits were set
1183 // under protection of the compile queue lock, which we hold now.
1184 // When the compilation completes, the compiler thread first sets
1185 // the compilation result and then clears the queued_for_compile
1186 // bits. Neither of these actions are protected by a barrier (or done
1187 // under the protection of a lock), so the only guarantee we have
1188 // (on machines with TSO (Total Store Order)) is that these values
1189 // will update in that order. As a result, the only combinations of
1190 // these bits that the current thread will see are, in temporal order:
1191 // <RESULT, QUEUE> :
1192 // <0, 1> : in compile queue, but not yet compiled
1193 // <1, 1> : compiled but queue bit not cleared
1194 // <1, 0> : compiled and queue bit cleared
1195 // Because we first check the queue bits then check the result bits,
1196 // we are assured that we cannot introduce a duplicate task.
1197 // Note that if we did the tests in the reverse order (i.e. check
1198 // result then check queued bit), we could get the result bit before
1199 // the compilation completed, and the queue bit after the compilation
1200 // completed, and end up introducing a "duplicate" (redundant) task.
1201 // In that case, the compiler thread should first check if a method
1202 // has already been compiled before trying to compile it.
1203 // NOTE: in the event that there are multiple compiler threads and
1204 // there is de-optimization/recompilation, things will get hairy,
1205 // and in that case it's best to protect both the testing (here) of
1206 // these bits, and their updating (here and elsewhere) under a
1207 // common lock.
1208 task = create_compile_task(queue,
1209 compile_id, method,
1210 osr_bci, comp_level,
1211 hot_method, hot_count, compile_reason,
1212 blocking);
1213 }
1214
1215 if (blocking) {
1216 wait_for_completion(task);
1217 }
1218 }
1219
1220 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1221 int comp_level,
1222 const methodHandle& hot_method, int hot_count,
1223 CompileTask::CompileReason compile_reason,
1224 Thread* THREAD) {
1225 // Do nothing if compilebroker is not initalized or compiles are submitted on level none
1226 if (!_initialized || comp_level == CompLevel_none) {
1227 return NULL;
1228 }
1229
1230 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1231 assert(comp != NULL, "Ensure we have a compiler");
1232
1233 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1234 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1235 DirectivesStack::release(directive);
1236 return nm;
1237 }
1238
1239 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1240 int comp_level,
1241 const methodHandle& hot_method, int hot_count,
1242 CompileTask::CompileReason compile_reason,
1243 DirectiveSet* directive,
1244 Thread* THREAD) {
1245
1246 // make sure arguments make sense
1247 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1248 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1249 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1250 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1251 assert(!TieredCompilation || comp_level <= TieredStopAtLevel, "Invalid compilation level");
1252 // allow any levels for WhiteBox
1253 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1254 // return quickly if possible
1255
1256 // lock, make sure that the compilation
1257 // isn't prohibited in a straightforward way.
1258 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1259 if (comp == NULL || !comp->can_compile_method(method) ||
1260 compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1261 return NULL;
1262 }
1263
1264 #if INCLUDE_JVMCI
1265 if (comp->is_jvmci() && !JVMCIRuntime::can_initialize_JVMCI()) {
1266 return NULL;
1267 }
1268 #endif
1269
1270 if (osr_bci == InvocationEntryBci) {
1271 // standard compilation
1272 CompiledMethod* method_code = method->code();
1273 if (method_code != NULL && method_code->is_nmethod()) {
1274 if (compilation_is_complete(method, osr_bci, comp_level)) {
1275 return (nmethod*) method_code;
1276 }
1277 }
1278 if (method->is_not_compilable(comp_level)) {
1279 return NULL;
1280 }
1281 } else {
1282 // osr compilation
1283 #ifndef TIERED
1284 // seems like an assert of dubious value
1285 assert(comp_level == CompLevel_highest_tier,
1286 "all OSR compiles are assumed to be at a single compilation level");
1287 #endif // TIERED
1288 // We accept a higher level osr method
1289 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1290 if (nm != NULL) return nm;
1291 if (method->is_not_osr_compilable(comp_level)) return NULL;
1292 }
1293
1294 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1295 // some prerequisites that are compiler specific
1296 if (comp->is_c2()) {
1297 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1298 // Resolve all classes seen in the signature of the method
1299 // we are compiling.
1300 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1301 }
1302
1303 // If the method is native, do the lookup in the thread requesting
1304 // the compilation. Native lookups can load code, which is not
1305 // permitted during compilation.
1306 //
1307 // Note: A native method implies non-osr compilation which is
1308 // checked with an assertion at the entry of this method.
1309 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1310 bool in_base_library;
1311 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1312 if (HAS_PENDING_EXCEPTION) {
1313 // In case of an exception looking up the method, we just forget
1314 // about it. The interpreter will kick-in and throw the exception.
1315 method->set_not_compilable(); // implies is_not_osr_compilable()
1316 CLEAR_PENDING_EXCEPTION;
1317 return NULL;
1318 }
1319 assert(method->has_native_function(), "must have native code by now");
1320 }
1321
1322 // RedefineClasses() has replaced this method; just return
1323 if (method->is_old()) {
1324 return NULL;
1325 }
1326
1327 // JVMTI -- post_compile_event requires jmethod_id() that may require
1328 // a lock the compiling thread can not acquire. Prefetch it here.
1329 if (JvmtiExport::should_post_compiled_method_load()) {
1330 method->jmethod_id();
1331 }
1332
1333 // do the compilation
1334 if (method->is_native()) {
1335 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1336 // The following native methods:
1337 //
1338 // java.lang.Float.intBitsToFloat
1339 // java.lang.Float.floatToRawIntBits
1340 // java.lang.Double.longBitsToDouble
1341 // java.lang.Double.doubleToRawLongBits
1342 //
1343 // are called through the interpreter even if interpreter native stubs
1344 // are not preferred (i.e., calling through adapter handlers is preferred).
1345 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1346 // if the version of the methods from the native libraries is called.
1347 // As the interpreter and the C2-intrinsified version of the methods preserves
1348 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1349 if ((UseSSE >= 1 &&
1350 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1351 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1352 (UseSSE >= 2 &&
1353 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1354 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1355 return NULL;
1356 }
1357
1358 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1359 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1360 //
1361 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1362 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1363 AdapterHandlerLibrary::create_native_wrapper(method);
1364 } else {
1365 return NULL;
1366 }
1367 } else {
1368 // If the compiler is shut off due to code cache getting full
1369 // fail out now so blocking compiles dont hang the java thread
1370 if (!should_compile_new_jobs()) {
1371 CompilationPolicy::policy()->delay_compilation(method());
1372 return NULL;
1373 }
1374 bool is_blocking = !directive->BackgroundCompilationOption || CompileTheWorld || ReplayCompiles;
1375 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1376 }
1377
1378 // return requested nmethod
1379 // We accept a higher level osr method
1380 if (osr_bci == InvocationEntryBci) {
1381 CompiledMethod* code = method->code();
1382 if (code == NULL) {
1383 return (nmethod*) code;
1384 } else {
1385 return code->as_nmethod_or_null();
1386 }
1387 }
1388 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1389 }
1390
1391
1392 // ------------------------------------------------------------------
1393 // CompileBroker::compilation_is_complete
1394 //
1395 // See if compilation of this method is already complete.
1396 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1397 int osr_bci,
1398 int comp_level) {
1399 bool is_osr = (osr_bci != standard_entry_bci);
1400 if (is_osr) {
1401 if (method->is_not_osr_compilable(comp_level)) {
1402 return true;
1403 } else {
1404 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1405 return (result != NULL);
1406 }
1407 } else {
1408 if (method->is_not_compilable(comp_level)) {
1409 return true;
1410 } else {
1411 CompiledMethod* result = method->code();
1412 if (result == NULL) return false;
1413 return comp_level == result->comp_level();
1414 }
1415 }
1416 }
1417
1418
1419 /**
1420 * See if this compilation is already requested.
1421 *
1422 * Implementation note: there is only a single "is in queue" bit
1423 * for each method. This means that the check below is overly
1424 * conservative in the sense that an osr compilation in the queue
1425 * will block a normal compilation from entering the queue (and vice
1426 * versa). This can be remedied by a full queue search to disambiguate
1427 * cases. If it is deemed profitable, this may be done.
1428 */
1429 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1430 return method->queued_for_compilation();
1431 }
1432
1433 // ------------------------------------------------------------------
1434 // CompileBroker::compilation_is_prohibited
1435 //
1436 // See if this compilation is not allowed.
1437 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1438 bool is_native = method->is_native();
1439 // Some compilers may not support the compilation of natives.
1440 AbstractCompiler *comp = compiler(comp_level);
1441 if (is_native &&
1442 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1443 method->set_not_compilable_quietly(comp_level);
1444 return true;
1445 }
1446
1447 bool is_osr = (osr_bci != standard_entry_bci);
1448 // Some compilers may not support on stack replacement.
1449 if (is_osr &&
1450 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1451 method->set_not_osr_compilable(comp_level);
1452 return true;
1453 }
1454
1455 // The method may be explicitly excluded by the user.
1456 double scale;
1457 if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1458 bool quietly = CompilerOracle::should_exclude_quietly();
1459 if (PrintCompilation && !quietly) {
1460 // This does not happen quietly...
1461 ResourceMark rm;
1462 tty->print("### Excluding %s:%s",
1463 method->is_native() ? "generation of native wrapper" : "compile",
1464 (method->is_static() ? " static" : ""));
1465 method->print_short_name(tty);
1466 tty->cr();
1467 }
1468 method->set_not_compilable(comp_level, !quietly, "excluded by CompileCommand");
1469 }
1470
1471 return false;
1472 }
1473
1474 /**
1475 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1476 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1477 * The function also allows to generate separate compilation IDs for OSR compilations.
1478 */
1479 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1480 #ifdef ASSERT
1481 bool is_osr = (osr_bci != standard_entry_bci);
1482 int id;
1483 if (method->is_native()) {
1484 assert(!is_osr, "can't be osr");
1485 // Adapters, native wrappers and method handle intrinsics
1486 // should be generated always.
1487 return Atomic::add(1, &_compilation_id);
1488 } else if (CICountOSR && is_osr) {
1489 id = Atomic::add(1, &_osr_compilation_id);
1490 if (CIStartOSR <= id && id < CIStopOSR) {
1491 return id;
1492 }
1493 } else {
1494 id = Atomic::add(1, &_compilation_id);
1495 if (CIStart <= id && id < CIStop) {
1496 return id;
1497 }
1498 }
1499
1500 // Method was not in the appropriate compilation range.
1501 method->set_not_compilable_quietly();
1502 return 0;
1503 #else
1504 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1505 // only _compilation_id is incremented.
1506 return Atomic::add(1, &_compilation_id);
1507 #endif
1508 }
1509
1510 // ------------------------------------------------------------------
1511 // CompileBroker::assign_compile_id_unlocked
1512 //
1513 // Public wrapper for assign_compile_id that acquires the needed locks
1514 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1515 MutexLocker locker(MethodCompileQueue_lock, thread);
1516 return assign_compile_id(method, osr_bci);
1517 }
1518
1519 // ------------------------------------------------------------------
1520 // CompileBroker::preload_classes
1521 void CompileBroker::preload_classes(const methodHandle& method, TRAPS) {
1522 // Move this code over from c1_Compiler.cpp
1523 ShouldNotReachHere();
1524 }
1525
1526
1527 // ------------------------------------------------------------------
1528 // CompileBroker::create_compile_task
1529 //
1530 // Create a CompileTask object representing the current request for
1531 // compilation. Add this task to the queue.
1532 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1533 int compile_id,
1534 const methodHandle& method,
1535 int osr_bci,
1536 int comp_level,
1537 const methodHandle& hot_method,
1538 int hot_count,
1539 CompileTask::CompileReason compile_reason,
1540 bool blocking) {
1541 CompileTask* new_task = CompileTask::allocate();
1542 new_task->initialize(compile_id, method, osr_bci, comp_level,
1543 hot_method, hot_count, compile_reason,
1544 blocking);
1545 queue->add(new_task);
1546 return new_task;
1547 }
1548
1549 #if INCLUDE_JVMCI
1550 // The number of milliseconds to wait before checking if
1551 // JVMCI compilation has made progress.
1552 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1553
1554 // The number of JVMCI compilation progress checks that must fail
1555 // before unblocking a thread waiting for a blocking compilation.
1556 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1557
1558 /**
1559 * Waits for a JVMCI compiler to complete a given task. This thread
1560 * waits until either the task completes or it sees no JVMCI compilation
1561 * progress for N consecutive milliseconds where N is
1562 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1563 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1564 *
1565 * @return true if this thread needs to free/recycle the task
1566 */
1567 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1568 MutexLocker waiter(task->lock(), thread);
1569 int progress_wait_attempts = 0;
1570 int methods_compiled = jvmci->methods_compiled();
1571 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1572 task->lock()->wait(!Mutex::_no_safepoint_check_flag, JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1573 CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread();
1574
1575 bool progress;
1576 if (jvmci_compiler_thread != NULL) {
1577 // If the JVMCI compiler thread is not blocked, we deem it to be making progress.
1578 progress = jvmci_compiler_thread->thread_state() != _thread_blocked;
1579 } else {
1580 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1581 // that all JVMCI compiler threads are blocked on. We use the counter for
1582 // successful JVMCI compilations to determine whether JVMCI compilation
1583 // is still making progress through the JVMCI compiler queue.
1584 progress = jvmci->methods_compiled() != methods_compiled;
1585 }
1586
1587 if (!progress) {
1588 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1589 if (PrintCompilation) {
1590 task->print(tty, "wait for blocking compilation timed out");
1591 }
1592 break;
1593 }
1594 } else {
1595 progress_wait_attempts = 0;
1596 if (jvmci_compiler_thread == NULL) {
1597 methods_compiled = jvmci->methods_compiled();
1598 }
1599 }
1600 }
1601 task->clear_waiter();
1602 return task->is_complete();
1603 }
1604 #endif
1605
1606 /**
1607 * Wait for the compilation task to complete.
1608 */
1609 void CompileBroker::wait_for_completion(CompileTask* task) {
1610 if (CIPrintCompileQueue) {
1611 ttyLocker ttyl;
1612 tty->print_cr("BLOCKING FOR COMPILE");
1613 }
1614
1615 assert(task->is_blocking(), "can only wait on blocking task");
1616
1617 JavaThread* thread = JavaThread::current();
1618 thread->set_blocked_on_compilation(true);
1619
1620 methodHandle method(thread, task->method());
1621 bool free_task;
1622 #if INCLUDE_JVMCI
1623 AbstractCompiler* comp = compiler(task->comp_level());
1624 if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
1625 // It may return before compilation is completed.
1626 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1627 } else
1628 #endif
1629 {
1630 MutexLocker waiter(task->lock(), thread);
1631 free_task = true;
1632 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1633 task->lock()->wait();
1634 }
1635 }
1636
1637 thread->set_blocked_on_compilation(false);
1638 if (free_task) {
1639 if (is_compilation_disabled_forever()) {
1640 CompileTask::free(task);
1641 return;
1642 }
1643
1644 // It is harmless to check this status without the lock, because
1645 // completion is a stable property (until the task object is recycled).
1646 assert(task->is_complete(), "Compilation should have completed");
1647 assert(task->code_handle() == NULL, "must be reset");
1648
1649 // By convention, the waiter is responsible for recycling a
1650 // blocking CompileTask. Since there is only one waiter ever
1651 // waiting on a CompileTask, we know that no one else will
1652 // be using this CompileTask; we can free it.
1653 CompileTask::free(task);
1654 }
1655 }
1656
1657 /**
1658 * Initialize compiler thread(s) + compiler object(s). The postcondition
1659 * of this function is that the compiler runtimes are initialized and that
1660 * compiler threads can start compiling.
1661 */
1662 bool CompileBroker::init_compiler_runtime() {
1663 CompilerThread* thread = CompilerThread::current();
1664 AbstractCompiler* comp = thread->compiler();
1665 // Final sanity check - the compiler object must exist
1666 guarantee(comp != NULL, "Compiler object must exist");
1667
1668 int system_dictionary_modification_counter;
1669 {
1670 MutexLocker locker(Compile_lock, thread);
1671 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
1672 }
1673
1674 {
1675 // Must switch to native to allocate ci_env
1676 ThreadToNativeFromVM ttn(thread);
1677 ciEnv ci_env(NULL, system_dictionary_modification_counter);
1678 // Cache Jvmti state
1679 ci_env.cache_jvmti_state();
1680 // Cache DTrace flags
1681 ci_env.cache_dtrace_flags();
1682
1683 // Switch back to VM state to do compiler initialization
1684 ThreadInVMfromNative tv(thread);
1685 ResetNoHandleMark rnhm;
1686
1687 // Perform per-thread and global initializations
1688 comp->initialize();
1689 }
1690
1691 if (comp->is_failed()) {
1692 disable_compilation_forever();
1693 // If compiler initialization failed, no compiler thread that is specific to a
1694 // particular compiler runtime will ever start to compile methods.
1695 shutdown_compiler_runtime(comp, thread);
1696 return false;
1697 }
1698
1699 // C1 specific check
1700 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1701 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1702 return false;
1703 }
1704
1705 return true;
1706 }
1707
1708 /**
1709 * If C1 and/or C2 initialization failed, we shut down all compilation.
1710 * We do this to keep things simple. This can be changed if it ever turns
1711 * out to be a problem.
1712 */
1713 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1714 // Free buffer blob, if allocated
1715 if (thread->get_buffer_blob() != NULL) {
1716 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1717 CodeCache::free(thread->get_buffer_blob());
1718 }
1719
1720 if (comp->should_perform_shutdown()) {
1721 // There are two reasons for shutting down the compiler
1722 // 1) compiler runtime initialization failed
1723 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1724 warning("%s initialization failed. Shutting down all compilers", comp->name());
1725
1726 // Only one thread per compiler runtime object enters here
1727 // Set state to shut down
1728 comp->set_shut_down();
1729
1730 // Delete all queued compilation tasks to make compiler threads exit faster.
1731 if (_c1_compile_queue != NULL) {
1732 _c1_compile_queue->free_all();
1733 }
1734
1735 if (_c2_compile_queue != NULL) {
1736 _c2_compile_queue->free_all();
1737 }
1738
1739 // Set flags so that we continue execution with using interpreter only.
1740 UseCompiler = false;
1741 UseInterpreter = true;
1742
1743 // We could delete compiler runtimes also. However, there are references to
1744 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1745 // fail. This can be done later if necessary.
1746 }
1747 }
1748
1749 /**
1750 * Helper function to create new or reuse old CompileLog.
1751 */
1752 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1753 if (!LogCompilation) return NULL;
1754
1755 AbstractCompiler *compiler = ct->compiler();
1756 bool c1 = compiler->is_c1();
1757 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1758 assert(compiler_objects != NULL, "must be initialized at this point");
1759 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1760 assert(logs != NULL, "must be initialized at this point");
1761 int count = c1 ? _c1_count : _c2_count;
1762
1763 // Find Compiler number by its threadObj.
1764 oop compiler_obj = ct->threadObj();
1765 int compiler_number = 0;
1766 bool found = false;
1767 for (; compiler_number < count; compiler_number++) {
1768 if (oopDesc::equals(JNIHandles::resolve_non_null(compiler_objects[compiler_number]), compiler_obj)) {
1769 found = true;
1770 break;
1771 }
1772 }
1773 assert(found, "Compiler must exist at this point");
1774
1775 // Determine pointer for this thread's log.
1776 CompileLog** log_ptr = &logs[compiler_number];
1777
1778 // Return old one if it exists.
1779 CompileLog* log = *log_ptr;
1780 if (log != NULL) {
1781 ct->init_log(log);
1782 return log;
1783 }
1784
1785 // Create a new one and remember it.
1786 init_compiler_thread_log();
1787 log = ct->log();
1788 *log_ptr = log;
1789 return log;
1790 }
1791
1792 // ------------------------------------------------------------------
1793 // CompileBroker::compiler_thread_loop
1794 //
1795 // The main loop run by a CompilerThread.
1796 void CompileBroker::compiler_thread_loop() {
1797 CompilerThread* thread = CompilerThread::current();
1798 CompileQueue* queue = thread->queue();
1799 // For the thread that initializes the ciObjectFactory
1800 // this resource mark holds all the shared objects
1801 ResourceMark rm;
1802
1803 // First thread to get here will initialize the compiler interface
1804
1805 {
1806 ASSERT_IN_VM;
1807 MutexLocker only_one (CompileThread_lock, thread);
1808 if (!ciObjectFactory::is_initialized()) {
1809 ciObjectFactory::initialize();
1810 }
1811 }
1812
1813 // Open a log.
1814 CompileLog* log = get_log(thread);
1815 if (log != NULL) {
1816 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1817 thread->name(),
1818 os::current_thread_id(),
1819 os::current_process_id());
1820 log->stamp();
1821 log->end_elem();
1822 }
1823
1824 // If compiler thread/runtime initialization fails, exit the compiler thread
1825 if (!init_compiler_runtime()) {
1826 return;
1827 }
1828
1829 thread->start_idle_timer();
1830
1831 // Poll for new compilation tasks as long as the JVM runs. Compilation
1832 // should only be disabled if something went wrong while initializing the
1833 // compiler runtimes. This, in turn, should not happen. The only known case
1834 // when compiler runtime initialization fails is if there is not enough free
1835 // space in the code cache to generate the necessary stubs, etc.
1836 while (!is_compilation_disabled_forever()) {
1837 // We need this HandleMark to avoid leaking VM handles.
1838 HandleMark hm(thread);
1839
1840 CompileTask* task = queue->get();
1841 if (task == NULL) {
1842 if (UseDynamicNumberOfCompilerThreads) {
1843 // Access compiler_count under lock to enforce consistency.
1844 MutexLocker only_one(CompileThread_lock);
1845 if (can_remove(thread, true)) {
1846 if (TraceCompilerThreads) {
1847 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1848 thread->name(), thread->idle_time_millis());
1849 }
1850 // Free buffer blob, if allocated
1851 if (thread->get_buffer_blob() != NULL) {
1852 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1853 CodeCache::free(thread->get_buffer_blob());
1854 }
1855 return; // Stop this thread.
1856 }
1857 }
1858 } else {
1859
1860 // Give compiler threads an extra quanta. They tend to be bursty and
1861 // this helps the compiler to finish up the job.
1862 if (CompilerThreadHintNoPreempt) {
1863 os::hint_no_preempt();
1864 }
1865
1866 // Assign the task to the current thread. Mark this compilation
1867 // thread as active for the profiler.
1868 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1869 // occurs after fetching the compile task off the queue.
1870 CompileTaskWrapper ctw(task);
1871 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1872 task->set_code_handle(&result_handle);
1873 methodHandle method(thread, task->method());
1874
1875 // Never compile a method if breakpoints are present in it
1876 if (method()->number_of_breakpoints() == 0) {
1877 // Compile the method.
1878 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1879 invoke_compiler_on_method(task);
1880 thread->start_idle_timer();
1881 } else {
1882 // After compilation is disabled, remove remaining methods from queue
1883 method->clear_queued_for_compilation();
1884 task->set_failure_reason("compilation is disabled");
1885 }
1886 }
1887
1888 if (UseDynamicNumberOfCompilerThreads) {
1889 possibly_add_compiler_threads();
1890 }
1891 }
1892 }
1893
1894 // Shut down compiler runtime
1895 shutdown_compiler_runtime(thread->compiler(), thread);
1896 }
1897
1898 // ------------------------------------------------------------------
1899 // CompileBroker::init_compiler_thread_log
1900 //
1901 // Set up state required by +LogCompilation.
1902 void CompileBroker::init_compiler_thread_log() {
1903 CompilerThread* thread = CompilerThread::current();
1904 char file_name[4*K];
1905 FILE* fp = NULL;
1906 intx thread_id = os::current_thread_id();
1907 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1908 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1909 if (dir == NULL) {
1910 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1911 thread_id, os::current_process_id());
1912 } else {
1913 jio_snprintf(file_name, sizeof(file_name),
1914 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1915 os::file_separator(), thread_id, os::current_process_id());
1916 }
1917
1918 fp = fopen(file_name, "wt");
1919 if (fp != NULL) {
1920 if (LogCompilation && Verbose) {
1921 tty->print_cr("Opening compilation log %s", file_name);
1922 }
1923 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1924 if (log == NULL) {
1925 fclose(fp);
1926 return;
1927 }
1928 thread->init_log(log);
1929
1930 if (xtty != NULL) {
1931 ttyLocker ttyl;
1932 // Record any per thread log files
1933 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1934 }
1935 return;
1936 }
1937 }
1938 warning("Cannot open log file: %s", file_name);
1939 }
1940
1941 void CompileBroker::log_metaspace_failure() {
1942 const char* message = "some methods may not be compiled because metaspace "
1943 "is out of memory";
1944 if (_compilation_log != NULL) {
1945 _compilation_log->log_metaspace_failure(message);
1946 }
1947 if (PrintCompilation) {
1948 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1949 }
1950 }
1951
1952
1953 // ------------------------------------------------------------------
1954 // CompileBroker::set_should_block
1955 //
1956 // Set _should_block.
1957 // Call this from the VM, with Threads_lock held and a safepoint requested.
1958 void CompileBroker::set_should_block() {
1959 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1960 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1961 #ifndef PRODUCT
1962 if (PrintCompilation && (Verbose || WizardMode))
1963 tty->print_cr("notifying compiler thread pool to block");
1964 #endif
1965 _should_block = true;
1966 }
1967
1968 // ------------------------------------------------------------------
1969 // CompileBroker::maybe_block
1970 //
1971 // Call this from the compiler at convenient points, to poll for _should_block.
1972 void CompileBroker::maybe_block() {
1973 if (_should_block) {
1974 #ifndef PRODUCT
1975 if (PrintCompilation && (Verbose || WizardMode))
1976 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
1977 #endif
1978 ThreadInVMfromNative tivfn(JavaThread::current());
1979 }
1980 }
1981
1982 // wrapper for CodeCache::print_summary()
1983 static void codecache_print(bool detailed)
1984 {
1985 ResourceMark rm;
1986 stringStream s;
1987 // Dump code cache into a buffer before locking the tty,
1988 {
1989 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1990 CodeCache::print_summary(&s, detailed);
1991 }
1992 ttyLocker ttyl;
1993 tty->print("%s", s.as_string());
1994 }
1995
1996 // wrapper for CodeCache::print_summary() using outputStream
1997 static void codecache_print(outputStream* out, bool detailed) {
1998 ResourceMark rm;
1999 stringStream s;
2000
2001 // Dump code cache into a buffer
2002 {
2003 MutexLockerEx mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2004 CodeCache::print_summary(&s, detailed);
2005 }
2006
2007 char* remaining_log = s.as_string();
2008 while (*remaining_log != '\0') {
2009 char* eol = strchr(remaining_log, '\n');
2010 if (eol == NULL) {
2011 out->print_cr("%s", remaining_log);
2012 remaining_log = remaining_log + strlen(remaining_log);
2013 } else {
2014 *eol = '\0';
2015 out->print_cr("%s", remaining_log);
2016 remaining_log = eol + 1;
2017 }
2018 }
2019 }
2020
2021 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env,
2022 int compilable, const char* failure_reason) {
2023 if (success) {
2024 task->mark_success();
2025 if (ci_env != NULL) {
2026 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
2027 }
2028 if (_compilation_log != NULL) {
2029 nmethod* code = task->code();
2030 if (code != NULL) {
2031 _compilation_log->log_nmethod(thread, code);
2032 }
2033 }
2034 } else if (AbortVMOnCompilationFailure) {
2035 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2036 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2037 }
2038 if (compilable == ciEnv::MethodCompilable_never) {
2039 fatal("Never compilable: %s", failure_reason);
2040 }
2041 }
2042 // simulate crash during compilation
2043 assert(task->compile_id() != CICrashAt, "just as planned");
2044 }
2045
2046 static void post_compilation_event(EventCompilation* event, CompileTask* task) {
2047 assert(event != NULL, "invariant");
2048 assert(event->should_commit(), "invariant");
2049 event->set_method(task->method());
2050 event->set_compileId(task->compile_id());
2051 event->set_compileLevel(task->comp_level());
2052 event->set_succeded(task->is_success());
2053 event->set_isOsr(task->osr_bci() != CompileBroker::standard_entry_bci);
2054 event->set_codeSize((task->code() == NULL) ? 0 : task->code()->total_size());
2055 event->set_inlinedBytes(task->num_inlined_bytecodes());
2056 event->commit();
2057 }
2058
2059 int DirectivesStack::_depth = 0;
2060 CompilerDirectives* DirectivesStack::_top = NULL;
2061 CompilerDirectives* DirectivesStack::_bottom = NULL;
2062
2063 // ------------------------------------------------------------------
2064 // CompileBroker::invoke_compiler_on_method
2065 //
2066 // Compile a method.
2067 //
2068 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2069 task->print_ul();
2070 if (PrintCompilation) {
2071 ResourceMark rm;
2072 task->print_tty();
2073 }
2074 elapsedTimer time;
2075
2076 CompilerThread* thread = CompilerThread::current();
2077 ResourceMark rm(thread);
2078
2079 if (LogEvents) {
2080 _compilation_log->log_compile(thread, task);
2081 }
2082
2083 // Common flags.
2084 uint compile_id = task->compile_id();
2085 int osr_bci = task->osr_bci();
2086 bool is_osr = (osr_bci != standard_entry_bci);
2087 bool should_log = (thread->log() != NULL);
2088 bool should_break = false;
2089 const int task_level = task->comp_level();
2090 AbstractCompiler* comp = task->compiler();
2091
2092 DirectiveSet* directive;
2093 {
2094 // create the handle inside it's own block so it can't
2095 // accidentally be referenced once the thread transitions to
2096 // native. The NoHandleMark before the transition should catch
2097 // any cases where this occurs in the future.
2098 methodHandle method(thread, task->method());
2099 assert(!method->is_native(), "no longer compile natives");
2100
2101 // Look up matching directives
2102 directive = DirectivesStack::getMatchingDirective(method, comp);
2103
2104 // Save information about this method in case of failure.
2105 set_last_compile(thread, method, is_osr, task_level);
2106
2107 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2108 }
2109
2110 should_break = directive->BreakAtExecuteOption || task->check_break_at_flags();
2111 if (should_log && !directive->LogOption) {
2112 should_log = false;
2113 }
2114
2115 // Allocate a new set of JNI handles.
2116 push_jni_handle_block();
2117 Method* target_handle = task->method();
2118 int compilable = ciEnv::MethodCompilable;
2119 const char* failure_reason = NULL;
2120 const char* retry_message = NULL;
2121
2122 int system_dictionary_modification_counter;
2123 {
2124 MutexLocker locker(Compile_lock, thread);
2125 system_dictionary_modification_counter = SystemDictionary::number_of_modifications();
2126 }
2127
2128 #if INCLUDE_JVMCI
2129 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2130 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2131
2132 TraceTime t1("compilation", &time);
2133 EventCompilation event;
2134
2135 // Skip redefined methods
2136 if (target_handle->is_old()) {
2137 failure_reason = "redefined method";
2138 retry_message = "not retryable";
2139 compilable = ciEnv::MethodCompilable_never;
2140 } else {
2141 JVMCIEnv env(task, system_dictionary_modification_counter);
2142 methodHandle method(thread, target_handle);
2143 jvmci->compile_method(method, osr_bci, &env);
2144
2145 failure_reason = env.failure_reason();
2146 if (!env.retryable()) {
2147 retry_message = "not retryable";
2148 compilable = ciEnv::MethodCompilable_not_at_tier;
2149 }
2150 }
2151 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason);
2152 if (event.should_commit()) {
2153 post_compilation_event(&event, task);
2154 }
2155
2156 } else
2157 #endif // INCLUDE_JVMCI
2158 {
2159 NoHandleMark nhm;
2160 ThreadToNativeFromVM ttn(thread);
2161
2162 ciEnv ci_env(task, system_dictionary_modification_counter);
2163 if (should_break) {
2164 ci_env.set_break_at_compile(true);
2165 }
2166 if (should_log) {
2167 ci_env.set_log(thread->log());
2168 }
2169 assert(thread->env() == &ci_env, "set by ci_env");
2170 // The thread-env() field is cleared in ~CompileTaskWrapper.
2171
2172 // Cache Jvmti state
2173 ci_env.cache_jvmti_state();
2174
2175 // Cache DTrace flags
2176 ci_env.cache_dtrace_flags();
2177
2178 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2179
2180 TraceTime t1("compilation", &time);
2181 EventCompilation event;
2182
2183 if (comp == NULL) {
2184 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2185 } else {
2186 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2187 MonitorLockerEx locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2188 while (WhiteBox::compilation_locked) {
2189 locker.wait(Mutex::_no_safepoint_check_flag);
2190 }
2191 }
2192 comp->compile_method(&ci_env, target, osr_bci, directive);
2193 }
2194
2195 if (!ci_env.failing() && task->code() == NULL) {
2196 //assert(false, "compiler should always document failure");
2197 // The compiler elected, without comment, not to register a result.
2198 // Do not attempt further compilations of this method.
2199 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2200 }
2201
2202 // Copy this bit to the enclosing block:
2203 compilable = ci_env.compilable();
2204
2205 if (ci_env.failing()) {
2206 failure_reason = ci_env.failure_reason();
2207 retry_message = ci_env.retry_message();
2208 ci_env.report_failure(failure_reason);
2209 }
2210
2211 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason);
2212 if (event.should_commit()) {
2213 post_compilation_event(&event, task);
2214 }
2215 }
2216 // Remove the JNI handle block after the ciEnv destructor has run in
2217 // the previous block.
2218 pop_jni_handle_block();
2219
2220 if (failure_reason != NULL) {
2221 task->set_failure_reason(failure_reason);
2222 if (_compilation_log != NULL) {
2223 _compilation_log->log_failure(thread, task, failure_reason, retry_message);
2224 }
2225 if (PrintCompilation) {
2226 FormatBufferResource msg = retry_message != NULL ?
2227 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2228 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2229 task->print(tty, msg);
2230 }
2231 }
2232
2233 methodHandle method(thread, task->method());
2234
2235 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2236
2237 collect_statistics(thread, time, task);
2238
2239 nmethod* nm = task->code();
2240 if (nm != NULL) {
2241 nm->maybe_print_nmethod(directive);
2242 }
2243 DirectivesStack::release(directive);
2244
2245 if (PrintCompilation && PrintCompilation2) {
2246 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2247 tty->print("%4d ", compile_id); // print compilation number
2248 tty->print("%s ", (is_osr ? "%" : " "));
2249 if (task->code() != NULL) {
2250 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2251 }
2252 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2253 }
2254
2255 Log(compilation, codecache) log;
2256 if (log.is_debug()) {
2257 LogStream ls(log.debug());
2258 codecache_print(&ls, /* detailed= */ false);
2259 }
2260 if (PrintCodeCacheOnCompilation) {
2261 codecache_print(/* detailed= */ false);
2262 }
2263 // Disable compilation, if required.
2264 switch (compilable) {
2265 case ciEnv::MethodCompilable_never:
2266 if (is_osr)
2267 method->set_not_osr_compilable_quietly();
2268 else
2269 method->set_not_compilable_quietly();
2270 break;
2271 case ciEnv::MethodCompilable_not_at_tier:
2272 if (is_osr)
2273 method->set_not_osr_compilable_quietly(task_level);
2274 else
2275 method->set_not_compilable_quietly(task_level);
2276 break;
2277 }
2278
2279 // Note that the queued_for_compilation bits are cleared without
2280 // protection of a mutex. [They were set by the requester thread,
2281 // when adding the task to the compile queue -- at which time the
2282 // compile queue lock was held. Subsequently, we acquired the compile
2283 // queue lock to get this task off the compile queue; thus (to belabour
2284 // the point somewhat) our clearing of the bits must be occurring
2285 // only after the setting of the bits. See also 14012000 above.
2286 method->clear_queued_for_compilation();
2287
2288 #ifdef ASSERT
2289 if (CollectedHeap::fired_fake_oom()) {
2290 // The current compile received a fake OOM during compilation so
2291 // go ahead and exit the VM since the test apparently succeeded
2292 tty->print_cr("*** Shutting down VM after successful fake OOM");
2293 vm_exit(0);
2294 }
2295 #endif
2296 }
2297
2298 /**
2299 * The CodeCache is full. Print warning and disable compilation.
2300 * Schedule code cache cleaning so compilation can continue later.
2301 * This function needs to be called only from CodeCache::allocate(),
2302 * since we currently handle a full code cache uniformly.
2303 */
2304 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2305 UseInterpreter = true;
2306 if (UseCompiler || AlwaysCompileLoopMethods ) {
2307 if (xtty != NULL) {
2308 ResourceMark rm;
2309 stringStream s;
2310 // Dump code cache state into a buffer before locking the tty,
2311 // because log_state() will use locks causing lock conflicts.
2312 CodeCache::log_state(&s);
2313 // Lock to prevent tearing
2314 ttyLocker ttyl;
2315 xtty->begin_elem("code_cache_full");
2316 xtty->print("%s", s.as_string());
2317 xtty->stamp();
2318 xtty->end_elem();
2319 }
2320
2321 #ifndef PRODUCT
2322 if (CompileTheWorld || ExitOnFullCodeCache) {
2323 codecache_print(/* detailed= */ true);
2324 before_exit(JavaThread::current());
2325 exit_globals(); // will delete tty
2326 vm_direct_exit(CompileTheWorld ? 0 : 1);
2327 }
2328 #endif
2329 if (UseCodeCacheFlushing) {
2330 // Since code cache is full, immediately stop new compiles
2331 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2332 NMethodSweeper::log_sweep("disable_compiler");
2333 }
2334 } else {
2335 disable_compilation_forever();
2336 }
2337
2338 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2339 }
2340 }
2341
2342 // ------------------------------------------------------------------
2343 // CompileBroker::set_last_compile
2344 //
2345 // Record this compilation for debugging purposes.
2346 void CompileBroker::set_last_compile(CompilerThread* thread, const methodHandle& method, bool is_osr, int comp_level) {
2347 ResourceMark rm;
2348 char* method_name = method->name()->as_C_string();
2349 strncpy(_last_method_compiled, method_name, CompileBroker::name_buffer_length);
2350 _last_method_compiled[CompileBroker::name_buffer_length - 1] = '\0'; // ensure null terminated
2351 char current_method[CompilerCounters::cmname_buffer_length];
2352 size_t maxLen = CompilerCounters::cmname_buffer_length;
2353
2354 if (UsePerfData) {
2355 const char* class_name = method->method_holder()->name()->as_C_string();
2356
2357 size_t s1len = strlen(class_name);
2358 size_t s2len = strlen(method_name);
2359
2360 // check if we need to truncate the string
2361 if (s1len + s2len + 2 > maxLen) {
2362
2363 // the strategy is to lop off the leading characters of the
2364 // class name and the trailing characters of the method name.
2365
2366 if (s2len + 2 > maxLen) {
2367 // lop of the entire class name string, let snprintf handle
2368 // truncation of the method name.
2369 class_name += s1len; // null string
2370 }
2371 else {
2372 // lop off the extra characters from the front of the class name
2373 class_name += ((s1len + s2len + 2) - maxLen);
2374 }
2375 }
2376
2377 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2378 }
2379
2380 if (CICountOSR && is_osr) {
2381 _last_compile_type = osr_compile;
2382 } else {
2383 _last_compile_type = normal_compile;
2384 }
2385 _last_compile_level = comp_level;
2386
2387 if (UsePerfData) {
2388 CompilerCounters* counters = thread->counters();
2389 counters->set_current_method(current_method);
2390 counters->set_compile_type((jlong)_last_compile_type);
2391 }
2392 }
2393
2394
2395 // ------------------------------------------------------------------
2396 // CompileBroker::push_jni_handle_block
2397 //
2398 // Push on a new block of JNI handles.
2399 void CompileBroker::push_jni_handle_block() {
2400 JavaThread* thread = JavaThread::current();
2401
2402 // Allocate a new block for JNI handles.
2403 // Inlined code from jni_PushLocalFrame()
2404 JNIHandleBlock* java_handles = thread->active_handles();
2405 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2406 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2407 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2408 thread->set_active_handles(compile_handles);
2409 }
2410
2411
2412 // ------------------------------------------------------------------
2413 // CompileBroker::pop_jni_handle_block
2414 //
2415 // Pop off the current block of JNI handles.
2416 void CompileBroker::pop_jni_handle_block() {
2417 JavaThread* thread = JavaThread::current();
2418
2419 // Release our JNI handle block
2420 JNIHandleBlock* compile_handles = thread->active_handles();
2421 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2422 thread->set_active_handles(java_handles);
2423 compile_handles->set_pop_frame_link(NULL);
2424 JNIHandleBlock::release_block(compile_handles, thread); // may block
2425 }
2426
2427 // ------------------------------------------------------------------
2428 // CompileBroker::collect_statistics
2429 //
2430 // Collect statistics about the compilation.
2431
2432 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2433 bool success = task->is_success();
2434 methodHandle method (thread, task->method());
2435 uint compile_id = task->compile_id();
2436 bool is_osr = (task->osr_bci() != standard_entry_bci);
2437 nmethod* code = task->code();
2438 CompilerCounters* counters = thread->counters();
2439
2440 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2441 MutexLocker locker(CompileStatistics_lock);
2442
2443 // _perf variables are production performance counters which are
2444 // updated regardless of the setting of the CITime and CITimeEach flags
2445 //
2446
2447 // account all time, including bailouts and failures in this counter;
2448 // C1 and C2 counters are counting both successful and unsuccessful compiles
2449 _t_total_compilation.add(time);
2450
2451 if (!success) {
2452 _total_bailout_count++;
2453 if (UsePerfData) {
2454 _perf_last_failed_method->set_value(counters->current_method());
2455 _perf_last_failed_type->set_value(counters->compile_type());
2456 _perf_total_bailout_count->inc();
2457 }
2458 _t_bailedout_compilation.add(time);
2459 } else if (code == NULL) {
2460 if (UsePerfData) {
2461 _perf_last_invalidated_method->set_value(counters->current_method());
2462 _perf_last_invalidated_type->set_value(counters->compile_type());
2463 _perf_total_invalidated_count->inc();
2464 }
2465 _total_invalidated_count++;
2466 _t_invalidated_compilation.add(time);
2467 } else {
2468 // Compilation succeeded
2469
2470 // update compilation ticks - used by the implementation of
2471 // java.lang.management.CompilationMBean
2472 _perf_total_compilation->inc(time.ticks());
2473 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2474
2475 if (CITime) {
2476 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2477 if (is_osr) {
2478 _t_osr_compilation.add(time);
2479 _sum_osr_bytes_compiled += bytes_compiled;
2480 } else {
2481 _t_standard_compilation.add(time);
2482 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2483 }
2484
2485 #if INCLUDE_JVMCI
2486 AbstractCompiler* comp = compiler(task->comp_level());
2487 if (comp) {
2488 CompilerStatistics* stats = comp->stats();
2489 if (stats) {
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 += code->total_size();
2496 stats->_nmethods_code_size += code->insts_size();
2497 } else { // if (!stats)
2498 assert(false, "Compiler statistics object must exist");
2499 }
2500 } else { // if (!comp)
2501 assert(false, "Compiler object must exist");
2502 }
2503 #endif // INCLUDE_JVMCI
2504 }
2505
2506 if (UsePerfData) {
2507 // save the name of the last method compiled
2508 _perf_last_method->set_value(counters->current_method());
2509 _perf_last_compile_type->set_value(counters->compile_type());
2510 _perf_last_compile_size->set_value(method->code_size() +
2511 task->num_inlined_bytecodes());
2512 if (is_osr) {
2513 _perf_osr_compilation->inc(time.ticks());
2514 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2515 } else {
2516 _perf_standard_compilation->inc(time.ticks());
2517 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2518 }
2519 }
2520
2521 if (CITimeEach) {
2522 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2523 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2524 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2525 }
2526
2527 // Collect counts of successful compilations
2528 _sum_nmethod_size += code->total_size();
2529 _sum_nmethod_code_size += code->insts_size();
2530 _total_compile_count++;
2531
2532 if (UsePerfData) {
2533 _perf_sum_nmethod_size->inc( code->total_size());
2534 _perf_sum_nmethod_code_size->inc(code->insts_size());
2535 _perf_total_compile_count->inc();
2536 }
2537
2538 if (is_osr) {
2539 if (UsePerfData) _perf_total_osr_compile_count->inc();
2540 _total_osr_compile_count++;
2541 } else {
2542 if (UsePerfData) _perf_total_standard_compile_count->inc();
2543 _total_standard_compile_count++;
2544 }
2545 }
2546 // set the current method for the thread to null
2547 if (UsePerfData) counters->set_current_method("");
2548 }
2549
2550 const char* CompileBroker::compiler_name(int comp_level) {
2551 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2552 if (comp == NULL) {
2553 return "no compiler";
2554 } else {
2555 return (comp->name());
2556 }
2557 }
2558
2559 #if INCLUDE_JVMCI
2560 void CompileBroker::print_times(AbstractCompiler* comp) {
2561 CompilerStatistics* stats = comp->stats();
2562 if (stats) {
2563 tty->print_cr(" %s {speed: %d 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}",
2564 comp->name(), stats->bytes_per_second(),
2565 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2566 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2567 stats->_nmethods_size, stats->_nmethods_code_size);
2568 } else { // if (!stats)
2569 assert(false, "Compiler statistics object must exist");
2570 }
2571 comp->print_timers();
2572 }
2573 #endif // INCLUDE_JVMCI
2574
2575 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2576 #if INCLUDE_JVMCI
2577 elapsedTimer standard_compilation;
2578 elapsedTimer total_compilation;
2579 elapsedTimer osr_compilation;
2580
2581 int standard_bytes_compiled = 0;
2582 int osr_bytes_compiled = 0;
2583
2584 int standard_compile_count = 0;
2585 int osr_compile_count = 0;
2586 int total_compile_count = 0;
2587
2588 int nmethods_size = 0;
2589 int nmethods_code_size = 0;
2590 bool printedHeader = false;
2591
2592 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2593 AbstractCompiler* comp = _compilers[i];
2594 if (comp != NULL) {
2595 if (per_compiler && aggregate && !printedHeader) {
2596 printedHeader = true;
2597 tty->cr();
2598 tty->print_cr("Individual compiler times (for compiled methods only)");
2599 tty->print_cr("------------------------------------------------");
2600 tty->cr();
2601 }
2602 CompilerStatistics* stats = comp->stats();
2603
2604 if (stats) {
2605 standard_compilation.add(stats->_standard._time);
2606 osr_compilation.add(stats->_osr._time);
2607
2608 standard_bytes_compiled += stats->_standard._bytes;
2609 osr_bytes_compiled += stats->_osr._bytes;
2610
2611 standard_compile_count += stats->_standard._count;
2612 osr_compile_count += stats->_osr._count;
2613
2614 nmethods_size += stats->_nmethods_size;
2615 nmethods_code_size += stats->_nmethods_code_size;
2616 } else { // if (!stats)
2617 assert(false, "Compiler statistics object must exist");
2618 }
2619
2620 if (per_compiler) {
2621 print_times(comp);
2622 }
2623 }
2624 }
2625 total_compile_count = osr_compile_count + standard_compile_count;
2626 total_compilation.add(osr_compilation);
2627 total_compilation.add(standard_compilation);
2628
2629 // In hosted mode, print the JVMCI compiler specific counters manually.
2630 if (!UseJVMCICompiler) {
2631 JVMCICompiler::print_compilation_timers();
2632 }
2633 #else // INCLUDE_JVMCI
2634 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2635 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2636 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2637
2638 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2639 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2640
2641 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2642 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2643 int total_compile_count = CompileBroker::_total_compile_count;
2644
2645 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2646 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2647 #endif // INCLUDE_JVMCI
2648
2649 if (!aggregate) {
2650 return;
2651 }
2652 tty->cr();
2653 tty->print_cr("Accumulated compiler times");
2654 tty->print_cr("----------------------------------------------------------");
2655 //0000000000111111111122222222223333333333444444444455555555556666666666
2656 //0123456789012345678901234567890123456789012345678901234567890123456789
2657 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2658 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2659 standard_compilation.seconds(),
2660 standard_compilation.seconds() / standard_compile_count);
2661 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2662 CompileBroker::_t_bailedout_compilation.seconds(),
2663 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2664 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2665 osr_compilation.seconds(),
2666 osr_compilation.seconds() / osr_compile_count);
2667 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2668 CompileBroker::_t_invalidated_compilation.seconds(),
2669 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2670
2671 AbstractCompiler *comp = compiler(CompLevel_simple);
2672 if (comp != NULL) {
2673 tty->cr();
2674 comp->print_timers();
2675 }
2676 comp = compiler(CompLevel_full_optimization);
2677 if (comp != NULL) {
2678 tty->cr();
2679 comp->print_timers();
2680 }
2681 tty->cr();
2682 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2683 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2684 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2685 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2686 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2687 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2688 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2689 double tcs = total_compilation.seconds();
2690 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2691 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2692 tty->cr();
2693 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2694 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2695 }
2696
2697 // Debugging output for failure
2698 void CompileBroker::print_last_compile() {
2699 if (_last_compile_level != CompLevel_none &&
2700 compiler(_last_compile_level) != NULL &&
2701 _last_compile_type != no_compile) {
2702 if (_last_compile_type == osr_compile) {
2703 tty->print_cr("Last parse: [osr]%d+++(%d) %s",
2704 _osr_compilation_id, _last_compile_level, _last_method_compiled);
2705 } else {
2706 tty->print_cr("Last parse: %d+++(%d) %s",
2707 _compilation_id, _last_compile_level, _last_method_compiled);
2708 }
2709 }
2710 }
2711
2712 // Print general/accumulated JIT information.
2713 void CompileBroker::print_info(outputStream *out) {
2714 if (out == NULL) out = tty;
2715 out->cr();
2716 out->print_cr("======================");
2717 out->print_cr(" General JIT info ");
2718 out->print_cr("======================");
2719 out->cr();
2720 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2721 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2722 out->cr();
2723 out->print_cr("CodeCache overview");
2724 out->print_cr("--------------------------------------------------------");
2725 out->cr();
2726 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2727 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2728 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2729 out->cr();
2730
2731 out->cr();
2732 out->print_cr("CodeCache cleaning overview");
2733 out->print_cr("--------------------------------------------------------");
2734 out->cr();
2735 NMethodSweeper::print(out);
2736 out->print_cr("--------------------------------------------------------");
2737 out->cr();
2738 }
2739
2740 // Note: tty_lock must not be held upon entry to this function.
2741 // Print functions called from herein do "micro-locking" on tty_lock.
2742 // That's a tradeoff which keeps together important blocks of output.
2743 // At the same time, continuous tty_lock hold time is kept in check,
2744 // preventing concurrently printing threads from stalling a long time.
2745 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2746 TimeStamp ts_total;
2747 TimeStamp ts_global;
2748 TimeStamp ts;
2749
2750 bool allFun = !strcmp(function, "all");
2751 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2752 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2753 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2754 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2755 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2756 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2757 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2758 bool discard = !strcmp(function, "discard") || allFun;
2759
2760 if (out == NULL) {
2761 out = tty;
2762 }
2763
2764 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2765 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2766 out->cr();
2767 return;
2768 }
2769
2770 ts_total.update(); // record starting point
2771
2772 if (aggregate) {
2773 print_info(out);
2774 }
2775
2776 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2777 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2778 // When we request individual parts of the analysis via the jcmd interface, it is possible
2779 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2780 // updated the aggregated data. We will then see a modified, but again consistent, view
2781 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2782 // a lock across user interaction.
2783
2784 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2785 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2786 // leading to an unnecessarily long hold time of the other locks we acquired before.
2787 ts.update(); // record starting point
2788 MutexLockerEx mu0(CodeHeapStateAnalytics_lock);
2789 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2790
2791 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2792 // Unfortunately, such protection is not sufficient:
2793 // When a new nmethod is created via ciEnv::register_method(), the
2794 // Compile_lock is taken first. After some initializations,
2795 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2796 // immediately (after finalizing the oop references). To lock out concurrent
2797 // modifiers, we have to grab both locks as well in the described sequence.
2798 //
2799 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2800 // for the entire duration of aggregation and printing. That makes sure we see
2801 // a consistent picture and do not run into issues caused by concurrent alterations.
2802 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2803 !Compile_lock->owned_by_self();
2804 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2805 !CodeCache_lock->owned_by_self();
2806 Mutex* global_lock_1 = allFun ? (should_take_Compile_lock ? Compile_lock : NULL) : NULL;
2807 Monitor* global_lock_2 = allFun ? (should_take_CodeCache_lock ? CodeCache_lock : NULL) : NULL;
2808 Mutex* function_lock_1 = allFun ? NULL : (should_take_Compile_lock ? Compile_lock : NULL);
2809 Monitor* function_lock_2 = allFun ? NULL : (should_take_CodeCache_lock ? CodeCache_lock : NULL);
2810 ts_global.update(); // record starting point
2811 MutexLockerEx mu1(global_lock_1, Mutex::_no_safepoint_check_flag);
2812 MutexLockerEx mu2(global_lock_2, Mutex::_no_safepoint_check_flag);
2813 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2814 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2815 ts_global.update(); // record starting point
2816 }
2817
2818 if (aggregate) {
2819 ts.update(); // record starting point
2820 MutexLockerEx mu11(function_lock_1, Mutex::_no_safepoint_check_flag);
2821 MutexLockerEx mu22(function_lock_2, Mutex::_no_safepoint_check_flag);
2822 if ((function_lock_1 != NULL) || (function_lock_2 != NULL)) {
2823 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2824 }
2825
2826 ts.update(); // record starting point
2827 CodeCache::aggregate(out, granularity);
2828 if ((function_lock_1 != NULL) || (function_lock_2 != NULL)) {
2829 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2830 }
2831 }
2832
2833 if (usedSpace) CodeCache::print_usedSpace(out);
2834 if (freeSpace) CodeCache::print_freeSpace(out);
2835 if (methodCount) CodeCache::print_count(out);
2836 if (methodSpace) CodeCache::print_space(out);
2837 if (methodAge) CodeCache::print_age(out);
2838 if (methodNames) {
2839 if (allFun) {
2840 // print_names() can only be used safely if the locks have been continuously held
2841 // since aggregation begin. That is true only for function "all".
2842 CodeCache::print_names(out);
2843 } else {
2844 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2845 }
2846 }
2847 if (discard) CodeCache::discard(out);
2848
2849 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2850 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2851 }
2852 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2853 }