1 /*
2 * Copyright (c) 1999, 2020, 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/compilationPolicy.hpp"
34 #include "compiler/compileBroker.hpp"
35 #include "compiler/compileLog.hpp"
36 #include "compiler/compilerEvent.hpp"
37 #include "compiler/compilerOracle.hpp"
38 #include "compiler/directivesParser.hpp"
39 #include "interpreter/linkResolver.hpp"
40 #include "jfr/jfrEvents.hpp"
41 #include "logging/log.hpp"
42 #include "logging/logStream.hpp"
43 #include "memory/allocation.inline.hpp"
44 #include "memory/resourceArea.hpp"
45 #include "memory/universe.hpp"
46 #include "oops/methodData.hpp"
47 #include "oops/method.inline.hpp"
48 #include "oops/oop.inline.hpp"
49 #include "prims/nativeLookup.hpp"
50 #include "prims/whitebox.hpp"
51 #include "runtime/arguments.hpp"
52 #include "runtime/atomic.hpp"
53 #include "runtime/handles.inline.hpp"
54 #include "runtime/init.hpp"
55 #include "runtime/interfaceSupport.inline.hpp"
56 #include "runtime/javaCalls.hpp"
57 #include "runtime/jniHandles.inline.hpp"
58 #include "runtime/os.hpp"
59 #include "runtime/safepointVerifiers.hpp"
60 #include "runtime/sharedRuntime.hpp"
61 #include "runtime/sweeper.hpp"
62 #include "runtime/timerTrace.hpp"
63 #include "runtime/vframe.inline.hpp"
64 #include "utilities/debug.hpp"
65 #include "utilities/dtrace.hpp"
66 #include "utilities/events.hpp"
67 #include "utilities/formatBuffer.hpp"
68 #include "utilities/macros.hpp"
69 #ifdef COMPILER1
70 #include "c1/c1_Compiler.hpp"
71 #endif
72 #if INCLUDE_JVMCI
73 #include "jvmci/jvmciEnv.hpp"
74 #include "jvmci/jvmciRuntime.hpp"
75 #endif
76 #ifdef COMPILER2
77 #include "opto/c2compiler.hpp"
78 #endif
79
80 #ifdef DTRACE_ENABLED
81
82 // Only bother with this argument setup if dtrace is available
83
84 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
85 { \
86 Symbol* klass_name = (method)->klass_name(); \
87 Symbol* name = (method)->name(); \
88 Symbol* signature = (method)->signature(); \
89 HOTSPOT_METHOD_COMPILE_BEGIN( \
90 (char *) comp_name, strlen(comp_name), \
91 (char *) klass_name->bytes(), klass_name->utf8_length(), \
92 (char *) name->bytes(), name->utf8_length(), \
93 (char *) signature->bytes(), signature->utf8_length()); \
94 }
95
96 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
97 { \
98 Symbol* klass_name = (method)->klass_name(); \
99 Symbol* name = (method)->name(); \
100 Symbol* signature = (method)->signature(); \
101 HOTSPOT_METHOD_COMPILE_END( \
102 (char *) comp_name, strlen(comp_name), \
103 (char *) klass_name->bytes(), klass_name->utf8_length(), \
104 (char *) name->bytes(), name->utf8_length(), \
105 (char *) signature->bytes(), signature->utf8_length(), (success)); \
106 }
107
108 #else // ndef DTRACE_ENABLED
109
110 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
111 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
112
113 #endif // ndef DTRACE_ENABLED
114
115 bool CompileBroker::_initialized = false;
116 volatile bool CompileBroker::_should_block = false;
117 volatile int CompileBroker::_print_compilation_warning = 0;
118 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
119
120 // The installed compiler(s)
121 AbstractCompiler* CompileBroker::_compilers[2];
122
123 // The maximum numbers of compiler threads to be determined during startup.
124 int CompileBroker::_c1_count = 0;
125 int CompileBroker::_c2_count = 0;
126
127 // An array of compiler names as Java String objects
128 jobject* CompileBroker::_compiler1_objects = NULL;
129 jobject* CompileBroker::_compiler2_objects = NULL;
130
131 CompileLog** CompileBroker::_compiler1_logs = NULL;
132 CompileLog** CompileBroker::_compiler2_logs = NULL;
133
134 // These counters are used to assign an unique ID to each compilation.
135 volatile jint CompileBroker::_compilation_id = 0;
136 volatile jint CompileBroker::_osr_compilation_id = 0;
137
138 // Performance counters
139 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
140 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
141 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
142
143 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
144 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
145 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
146 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
147 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
148
149 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
150 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
151 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
152 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
153
154 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
155 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
156 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
157 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
158 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
159 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
160 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
161
162 // Timers and counters for generating statistics
163 elapsedTimer CompileBroker::_t_total_compilation;
164 elapsedTimer CompileBroker::_t_osr_compilation;
165 elapsedTimer CompileBroker::_t_standard_compilation;
166 elapsedTimer CompileBroker::_t_invalidated_compilation;
167 elapsedTimer CompileBroker::_t_bailedout_compilation;
168
169 int CompileBroker::_total_bailout_count = 0;
170 int CompileBroker::_total_invalidated_count = 0;
171 int CompileBroker::_total_compile_count = 0;
172 int CompileBroker::_total_osr_compile_count = 0;
173 int CompileBroker::_total_standard_compile_count = 0;
174 int CompileBroker::_total_compiler_stopped_count = 0;
175 int CompileBroker::_total_compiler_restarted_count = 0;
176
177 int CompileBroker::_sum_osr_bytes_compiled = 0;
178 int CompileBroker::_sum_standard_bytes_compiled = 0;
179 int CompileBroker::_sum_nmethod_size = 0;
180 int CompileBroker::_sum_nmethod_code_size = 0;
181
182 long CompileBroker::_peak_compilation_time = 0;
183
184 CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization];
185
186 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
187 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
188
189
190
191 class CompilationLog : public StringEventLog {
192 public:
193 CompilationLog() : StringEventLog("Compilation events", "jit") {
194 }
195
196 void log_compile(JavaThread* thread, CompileTask* task) {
197 StringLogMessage lm;
198 stringStream sstr(lm.buffer(), lm.size());
199 // msg.time_stamp().update_to(tty->time_stamp().ticks());
200 task->print(&sstr, NULL, true, false);
201 log(thread, "%s", (const char*)lm);
202 }
203
204 void log_nmethod(JavaThread* thread, nmethod* nm) {
205 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
206 nm->compile_id(), nm->is_osr_method() ? "%" : "",
207 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
208 }
209
210 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
211 StringLogMessage lm;
212 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
213 if (retry_message != NULL) {
214 lm.append(" (%s)", retry_message);
215 }
216 lm.print("\n");
217 log(thread, "%s", (const char*)lm);
218 }
219
220 void log_metaspace_failure(const char* reason) {
221 ResourceMark rm;
222 StringLogMessage lm;
223 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
224 lm.print("\n");
225 log(JavaThread::current(), "%s", (const char*)lm);
226 }
227 };
228
229 static CompilationLog* _compilation_log = NULL;
230
231 bool compileBroker_init() {
232 if (LogEvents) {
233 _compilation_log = new CompilationLog();
234 }
235
236 // init directives stack, adding default directive
237 DirectivesStack::init();
238
239 if (DirectivesParser::has_file()) {
240 return DirectivesParser::parse_from_flag();
241 } else if (CompilerDirectivesPrint) {
242 // Print default directive even when no other was added
243 DirectivesStack::print(tty);
244 }
245
246 return true;
247 }
248
249 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
250 CompilerThread* thread = CompilerThread::current();
251 thread->set_task(task);
252 #if INCLUDE_JVMCI
253 if (task->is_blocking() && CompileBroker::compiler(task->comp_level())->is_jvmci()) {
254 task->set_jvmci_compiler_thread(thread);
255 }
256 #endif
257 CompileLog* log = thread->log();
258 if (log != NULL && !task->is_unloaded()) task->log_task_start(log);
259 }
260
261 CompileTaskWrapper::~CompileTaskWrapper() {
262 CompilerThread* thread = CompilerThread::current();
263 CompileTask* task = thread->task();
264 CompileLog* log = thread->log();
265 if (log != NULL && !task->is_unloaded()) task->log_task_done(log);
266 thread->set_task(NULL);
267 task->set_code_handle(NULL);
268 thread->set_env(NULL);
269 if (task->is_blocking()) {
270 bool free_task = false;
271 {
272 MutexLocker notifier(thread, task->lock());
273 task->mark_complete();
274 #if INCLUDE_JVMCI
275 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
276 if (!task->has_waiter()) {
277 // The waiting thread timed out and thus did not free the task.
278 free_task = true;
279 }
280 task->set_jvmci_compiler_thread(NULL);
281 }
282 #endif
283 if (!free_task) {
284 // Notify the waiting thread that the compilation has completed
285 // so that it can free the task.
286 task->lock()->notify_all();
287 }
288 }
289 if (free_task) {
290 // The task can only be freed once the task lock is released.
291 CompileTask::free(task);
292 }
293 } else {
294 task->mark_complete();
295
296 // By convention, the compiling thread is responsible for
297 // recycling a non-blocking CompileTask.
298 CompileTask::free(task);
299 }
300 }
301
302 /**
303 * Check if a CompilerThread can be removed and update count if requested.
304 */
305 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
306 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
307 if (!ReduceNumberOfCompilerThreads) return false;
308
309 AbstractCompiler *compiler = ct->compiler();
310 int compiler_count = compiler->num_compiler_threads();
311 bool c1 = compiler->is_c1();
312
313 // Keep at least 1 compiler thread of each type.
314 if (compiler_count < 2) return false;
315
316 // Keep thread alive for at least some time.
317 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
318
319 #if INCLUDE_JVMCI
320 if (compiler->is_jvmci()) {
321 // Handles for JVMCI thread objects may get released concurrently.
322 if (do_it) {
323 assert(CompileThread_lock->owner() == ct, "must be holding lock");
324 } else {
325 // Skip check if it's the last thread and let caller check again.
326 return true;
327 }
328 }
329 #endif
330
331 // We only allow the last compiler thread of each type to get removed.
332 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
333 : compiler2_object(compiler_count - 1);
334 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
335 if (do_it) {
336 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
337 compiler->set_num_compiler_threads(compiler_count - 1);
338 #if INCLUDE_JVMCI
339 if (compiler->is_jvmci()) {
340 // Old j.l.Thread object can die when no longer referenced elsewhere.
341 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
342 _compiler2_objects[compiler_count - 1] = NULL;
343 }
344 #endif
345 }
346 return true;
347 }
348 return false;
349 }
350
351 /**
352 * Add a CompileTask to a CompileQueue.
353 */
354 void CompileQueue::add(CompileTask* task) {
355 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
356
357 task->set_next(NULL);
358 task->set_prev(NULL);
359
360 if (_last == NULL) {
361 // The compile queue is empty.
362 assert(_first == NULL, "queue is empty");
363 _first = task;
364 _last = task;
365 } else {
366 // Append the task to the queue.
367 assert(_last->next() == NULL, "not last");
368 _last->set_next(task);
369 task->set_prev(_last);
370 _last = task;
371 }
372 ++_size;
373
374 // Mark the method as being in the compile queue.
375 task->method()->set_queued_for_compilation();
376
377 if (CIPrintCompileQueue) {
378 print_tty();
379 }
380
381 if (LogCompilation && xtty != NULL) {
382 task->log_task_queued();
383 }
384
385 // Notify CompilerThreads that a task is available.
386 MethodCompileQueue_lock->notify_all();
387 }
388
389 /**
390 * Empties compilation queue by putting all compilation tasks onto
391 * a freelist. Furthermore, the method wakes up all threads that are
392 * waiting on a compilation task to finish. This can happen if background
393 * compilation is disabled.
394 */
395 void CompileQueue::free_all() {
396 MutexLocker mu(MethodCompileQueue_lock);
397 CompileTask* next = _first;
398
399 // Iterate over all tasks in the compile queue
400 while (next != NULL) {
401 CompileTask* current = next;
402 next = current->next();
403 {
404 // Wake up thread that blocks on the compile task.
405 MutexLocker ct_lock(current->lock());
406 current->lock()->notify();
407 }
408 // Put the task back on the freelist.
409 CompileTask::free(current);
410 }
411 _first = NULL;
412
413 // Wake up all threads that block on the queue.
414 MethodCompileQueue_lock->notify_all();
415 }
416
417 /**
418 * Get the next CompileTask from a CompileQueue
419 */
420 CompileTask* CompileQueue::get() {
421 // save methods from RedefineClasses across safepoint
422 // across MethodCompileQueue_lock below.
423 methodHandle save_method;
424 methodHandle save_hot_method;
425
426 MonitorLocker locker(MethodCompileQueue_lock);
427 // If _first is NULL we have no more compile jobs. There are two reasons for
428 // having no compile jobs: First, we compiled everything we wanted. Second,
429 // we ran out of code cache so compilation has been disabled. In the latter
430 // case we perform code cache sweeps to free memory such that we can re-enable
431 // compilation.
432 while (_first == NULL) {
433 // Exit loop if compilation is disabled forever
434 if (CompileBroker::is_compilation_disabled_forever()) {
435 return NULL;
436 }
437
438 // If there are no compilation tasks and we can compile new jobs
439 // (i.e., there is enough free space in the code cache) there is
440 // no need to invoke the sweeper. As a result, the hotness of methods
441 // remains unchanged. This behavior is desired, since we want to keep
442 // the stable state, i.e., we do not want to evict methods from the
443 // code cache if it is unnecessary.
444 // We need a timed wait here, since compiler threads can exit if compilation
445 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
446 // is not critical and we do not want idle compiler threads to wake up too often.
447 locker.wait(5*1000);
448
449 if (UseDynamicNumberOfCompilerThreads && _first == NULL) {
450 // Still nothing to compile. Give caller a chance to stop this thread.
451 if (CompileBroker::can_remove(CompilerThread::current(), false)) return NULL;
452 }
453 }
454
455 if (CompileBroker::is_compilation_disabled_forever()) {
456 return NULL;
457 }
458
459 CompileTask* task;
460 {
461 NoSafepointVerifier nsv;
462 task = CompilationPolicy::policy()->select_task(this);
463 if (task != NULL) {
464 task = task->select_for_compilation();
465 }
466 }
467
468 if (task != NULL) {
469 // Save method pointers across unlock safepoint. The task is removed from
470 // the compilation queue, which is walked during RedefineClasses.
471 Thread* thread = Thread::current();
472 save_method = methodHandle(thread, task->method());
473 save_hot_method = methodHandle(thread, task->hot_method());
474
475 remove(task);
476 }
477 purge_stale_tasks(); // may temporarily release MCQ lock
478 return task;
479 }
480
481 // Clean & deallocate stale compile tasks.
482 // Temporarily releases MethodCompileQueue lock.
483 void CompileQueue::purge_stale_tasks() {
484 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
485 if (_first_stale != NULL) {
486 // Stale tasks are purged when MCQ lock is released,
487 // but _first_stale updates are protected by MCQ lock.
488 // Once task processing starts and MCQ lock is released,
489 // other compiler threads can reuse _first_stale.
490 CompileTask* head = _first_stale;
491 _first_stale = NULL;
492 {
493 MutexUnlocker ul(MethodCompileQueue_lock);
494 for (CompileTask* task = head; task != NULL; ) {
495 CompileTask* next_task = task->next();
496 CompileTaskWrapper ctw(task); // Frees the task
497 task->set_failure_reason("stale task");
498 task = next_task;
499 }
500 }
501 }
502 }
503
504 void CompileQueue::remove(CompileTask* task) {
505 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
506 if (task->prev() != NULL) {
507 task->prev()->set_next(task->next());
508 } else {
509 // max is the first element
510 assert(task == _first, "Sanity");
511 _first = task->next();
512 }
513
514 if (task->next() != NULL) {
515 task->next()->set_prev(task->prev());
516 } else {
517 // max is the last element
518 assert(task == _last, "Sanity");
519 _last = task->prev();
520 }
521 --_size;
522 }
523
524 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
525 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
526 remove(task);
527
528 // Enqueue the task for reclamation (should be done outside MCQ lock)
529 task->set_next(_first_stale);
530 task->set_prev(NULL);
531 _first_stale = task;
532 }
533
534 // methods in the compile queue need to be marked as used on the stack
535 // so that they don't get reclaimed by Redefine Classes
536 void CompileQueue::mark_on_stack() {
537 CompileTask* task = _first;
538 while (task != NULL) {
539 task->mark_on_stack();
540 task = task->next();
541 }
542 }
543
544
545 CompileQueue* CompileBroker::compile_queue(int comp_level) {
546 if (is_c2_compile(comp_level)) return _c2_compile_queue;
547 if (is_c1_compile(comp_level)) return _c1_compile_queue;
548 return NULL;
549 }
550
551 void CompileBroker::print_compile_queues(outputStream* st) {
552 st->print_cr("Current compiles: ");
553
554 char buf[2000];
555 int buflen = sizeof(buf);
556 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
557
558 st->cr();
559 if (_c1_compile_queue != NULL) {
560 _c1_compile_queue->print(st);
561 }
562 if (_c2_compile_queue != NULL) {
563 _c2_compile_queue->print(st);
564 }
565 }
566
567 void CompileQueue::print(outputStream* st) {
568 assert_locked_or_safepoint(MethodCompileQueue_lock);
569 st->print_cr("%s:", name());
570 CompileTask* task = _first;
571 if (task == NULL) {
572 st->print_cr("Empty");
573 } else {
574 while (task != NULL) {
575 task->print(st, NULL, true, true);
576 task = task->next();
577 }
578 }
579 st->cr();
580 }
581
582 void CompileQueue::print_tty() {
583 ResourceMark rm;
584 stringStream ss;
585 // Dump the compile queue into a buffer before locking the tty
586 print(&ss);
587 {
588 ttyLocker ttyl;
589 tty->print("%s", ss.as_string());
590 }
591 }
592
593 CompilerCounters::CompilerCounters() {
594 _current_method[0] = '\0';
595 _compile_type = CompileBroker::no_compile;
596 }
597
598 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
599 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
600 // in compiler/compilerEvent.cpp) and registers it with its serializer.
601 //
602 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
603 // so if c2 is used, it should be always registered first.
604 // This function is called during vm initialization.
605 void register_jfr_phasetype_serializer(CompilerType compiler_type) {
606 ResourceMark rm;
607 static bool first_registration = true;
608 if (compiler_type == compiler_jvmci) {
609 // register serializer, phases will be added later lazily.
610 GrowableArray<const char*>* jvmci_phase_names = new GrowableArray<const char*>(1);
611 jvmci_phase_names->append("NOT_A_PHASE_NAME");
612 CompilerEvent::PhaseEvent::register_phases(jvmci_phase_names);
613 first_registration = false;
614 #ifdef COMPILER2
615 } else if (compiler_type == compiler_c2) {
616 assert(first_registration, "invariant"); // c2 must be registered first.
617 GrowableArray<const char*>* c2_phase_names = new GrowableArray<const char*>(PHASE_NUM_TYPES);
618 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
619 c2_phase_names->append(CompilerPhaseTypeHelper::to_string((CompilerPhaseType)i));
620 }
621 CompilerEvent::PhaseEvent::register_phases(c2_phase_names);
622 first_registration = false;
623 #endif // COMPILER2
624 }
625 }
626 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
627
628 // ------------------------------------------------------------------
629 // CompileBroker::compilation_init
630 //
631 // Initialize the Compilation object
632 void CompileBroker::compilation_init_phase1(Thread* THREAD) {
633 // No need to initialize compilation system if we do not use it.
634 if (!UseCompiler) {
635 return;
636 }
637 // Set the interface to the current compiler(s).
638 _c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
639 _c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
640
641 #if INCLUDE_JVMCI
642 if (EnableJVMCI) {
643 // This is creating a JVMCICompiler singleton.
644 JVMCICompiler* jvmci = new JVMCICompiler();
645
646 if (UseJVMCICompiler) {
647 _compilers[1] = jvmci;
648 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
649 if (BootstrapJVMCI) {
650 // JVMCI will bootstrap so give it more threads
651 _c2_count = MIN2(32, os::active_processor_count());
652 }
653 } else {
654 _c2_count = JVMCIThreads;
655 }
656 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
657 } else {
658 _c1_count = JVMCIHostThreads;
659 }
660 }
661 }
662 #endif // INCLUDE_JVMCI
663
664 #ifdef COMPILER1
665 if (_c1_count > 0) {
666 _compilers[0] = new Compiler();
667 }
668 #endif // COMPILER1
669
670 #ifdef COMPILER2
671 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
672 if (_c2_count > 0) {
673 _compilers[1] = new C2Compiler();
674 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
675 // idToPhase mapping for c2 is in opto/phasetype.hpp
676 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
677 }
678 }
679 #endif // COMPILER2
680
681 #if INCLUDE_JVMCI
682 // Register after c2 registration.
683 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
684 if (EnableJVMCI) {
685 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
686 }
687 #endif // INCLUDE_JVMCI
688
689 // Start the compiler thread(s) and the sweeper thread
690 init_compiler_sweeper_threads();
691 // totalTime performance counter is always created as it is required
692 // by the implementation of java.lang.management.CompilationMXBean.
693 {
694 // Ensure OOM leads to vm_exit_during_initialization.
695 EXCEPTION_MARK;
696 _perf_total_compilation =
697 PerfDataManager::create_counter(JAVA_CI, "totalTime",
698 PerfData::U_Ticks, CHECK);
699 }
700
701 if (UsePerfData) {
702
703 EXCEPTION_MARK;
704
705 // create the jvmstat performance counters
706 _perf_osr_compilation =
707 PerfDataManager::create_counter(SUN_CI, "osrTime",
708 PerfData::U_Ticks, CHECK);
709
710 _perf_standard_compilation =
711 PerfDataManager::create_counter(SUN_CI, "standardTime",
712 PerfData::U_Ticks, CHECK);
713
714 _perf_total_bailout_count =
715 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
716 PerfData::U_Events, CHECK);
717
718 _perf_total_invalidated_count =
719 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
720 PerfData::U_Events, CHECK);
721
722 _perf_total_compile_count =
723 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
724 PerfData::U_Events, CHECK);
725 _perf_total_osr_compile_count =
726 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
727 PerfData::U_Events, CHECK);
728
729 _perf_total_standard_compile_count =
730 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
731 PerfData::U_Events, CHECK);
732
733 _perf_sum_osr_bytes_compiled =
734 PerfDataManager::create_counter(SUN_CI, "osrBytes",
735 PerfData::U_Bytes, CHECK);
736
737 _perf_sum_standard_bytes_compiled =
738 PerfDataManager::create_counter(SUN_CI, "standardBytes",
739 PerfData::U_Bytes, CHECK);
740
741 _perf_sum_nmethod_size =
742 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
743 PerfData::U_Bytes, CHECK);
744
745 _perf_sum_nmethod_code_size =
746 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
747 PerfData::U_Bytes, CHECK);
748
749 _perf_last_method =
750 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
751 CompilerCounters::cmname_buffer_length,
752 "", CHECK);
753
754 _perf_last_failed_method =
755 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
756 CompilerCounters::cmname_buffer_length,
757 "", CHECK);
758
759 _perf_last_invalidated_method =
760 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
761 CompilerCounters::cmname_buffer_length,
762 "", CHECK);
763
764 _perf_last_compile_type =
765 PerfDataManager::create_variable(SUN_CI, "lastType",
766 PerfData::U_None,
767 (jlong)CompileBroker::no_compile,
768 CHECK);
769
770 _perf_last_compile_size =
771 PerfDataManager::create_variable(SUN_CI, "lastSize",
772 PerfData::U_Bytes,
773 (jlong)CompileBroker::no_compile,
774 CHECK);
775
776
777 _perf_last_failed_type =
778 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
779 PerfData::U_None,
780 (jlong)CompileBroker::no_compile,
781 CHECK);
782
783 _perf_last_invalidated_type =
784 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
785 PerfData::U_None,
786 (jlong)CompileBroker::no_compile,
787 CHECK);
788 }
789 }
790
791 // Completes compiler initialization. Compilation requests submitted
792 // prior to this will be silently ignored.
793 void CompileBroker::compilation_init_phase2() {
794 _initialized = true;
795 }
796
797 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
798 Handle string = java_lang_String::create_from_str(name, CHECK_NH);
799 Handle thread_group(THREAD, Universe::system_thread_group());
800 return JavaCalls::construct_new_instance(
801 SystemDictionary::Thread_klass(),
802 vmSymbols::threadgroup_string_void_signature(),
803 thread_group,
804 string,
805 CHECK_NH);
806 }
807
808
809 JavaThread* CompileBroker::make_thread(jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, Thread* THREAD) {
810 JavaThread* new_thread = NULL;
811 {
812 MutexLocker mu(THREAD, Threads_lock);
813 if (comp != NULL) {
814 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
815 CompilerCounters* counters = new CompilerCounters();
816 new_thread = new CompilerThread(queue, counters);
817 }
818 } else {
819 new_thread = new CodeCacheSweeperThread();
820 }
821 // At this point the new CompilerThread data-races with this startup
822 // thread (which I believe is the primoridal thread and NOT the VM
823 // thread). This means Java bytecodes being executed at startup can
824 // queue compile jobs which will run at whatever default priority the
825 // newly created CompilerThread runs at.
826
827
828 // At this point it may be possible that no osthread was created for the
829 // JavaThread due to lack of memory. We would have to throw an exception
830 // in that case. However, since this must work and we do not allow
831 // exceptions anyway, check and abort if this fails. But first release the
832 // lock.
833
834 if (new_thread != NULL && new_thread->osthread() != NULL) {
835
836 java_lang_Thread::set_thread(JNIHandles::resolve_non_null(thread_handle), new_thread);
837
838 // Note that this only sets the JavaThread _priority field, which by
839 // definition is limited to Java priorities and not OS priorities.
840 // The os-priority is set in the CompilerThread startup code itself
841
842 java_lang_Thread::set_priority(JNIHandles::resolve_non_null(thread_handle), NearMaxPriority);
843
844 // Note that we cannot call os::set_priority because it expects Java
845 // priorities and we are *explicitly* using OS priorities so that it's
846 // possible to set the compiler thread priority higher than any Java
847 // thread.
848
849 int native_prio = CompilerThreadPriority;
850 if (native_prio == -1) {
851 if (UseCriticalCompilerThreadPriority) {
852 native_prio = os::java_to_os_priority[CriticalPriority];
853 } else {
854 native_prio = os::java_to_os_priority[NearMaxPriority];
855 }
856 }
857 os::set_native_priority(new_thread, native_prio);
858
859 java_lang_Thread::set_daemon(JNIHandles::resolve_non_null(thread_handle));
860
861 new_thread->set_threadObj(JNIHandles::resolve_non_null(thread_handle));
862 if (comp != NULL) {
863 new_thread->as_CompilerThread()->set_compiler(comp);
864 }
865 Threads::add(new_thread);
866 Thread::start(new_thread);
867 }
868 }
869
870 // First release lock before aborting VM.
871 if (new_thread == NULL || new_thread->osthread() == NULL) {
872 if (UseDynamicNumberOfCompilerThreads && comp != NULL && comp->num_compiler_threads() > 0) {
873 if (new_thread != NULL) {
874 new_thread->smr_delete();
875 }
876 return NULL;
877 }
878 vm_exit_during_initialization("java.lang.OutOfMemoryError",
879 os::native_thread_creation_failed_msg());
880 }
881
882 // Let go of Threads_lock before yielding
883 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
884
885 return new_thread;
886 }
887
888
889 void CompileBroker::init_compiler_sweeper_threads() {
890 NMethodSweeper::set_sweep_threshold_bytes(static_cast<size_t>(SweeperThreshold * ReservedCodeCacheSize / 100.0));
891 log_info(codecache, sweep)("Sweeper threshold: " SIZE_FORMAT " bytes", NMethodSweeper::sweep_threshold_bytes());
892
893 // Ensure any exceptions lead to vm_exit_during_initialization.
894 EXCEPTION_MARK;
895 #if !defined(ZERO)
896 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
897 #endif // !ZERO
898 // Initialize the compilation queue
899 if (_c2_count > 0) {
900 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
901 _c2_compile_queue = new CompileQueue(name);
902 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
903 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
904 }
905 if (_c1_count > 0) {
906 _c1_compile_queue = new CompileQueue("C1 compile queue");
907 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
908 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
909 }
910
911 char name_buffer[256];
912
913 for (int i = 0; i < _c2_count; i++) {
914 jobject thread_handle = NULL;
915 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
916 // for JVMCI compiler which can create further ones on demand.
917 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
918 // Create a name for our thread.
919 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
920 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
921 thread_handle = JNIHandles::make_global(thread_oop);
922 JVMCI_ONLY(})
923 _compiler2_objects[i] = thread_handle;
924 _compiler2_logs[i] = NULL;
925
926 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
927 JavaThread *ct = make_thread(thread_handle, _c2_compile_queue, _compilers[1], THREAD);
928 assert(ct != NULL, "should have been handled for initial thread");
929 _compilers[1]->set_num_compiler_threads(i + 1);
930 if (TraceCompilerThreads) {
931 ResourceMark rm;
932 MutexLocker mu(Threads_lock);
933 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
934 }
935 }
936 }
937
938 for (int i = 0; i < _c1_count; i++) {
939 // Create a name for our thread.
940 sprintf(name_buffer, "C1 CompilerThread%d", i);
941 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
942 jobject thread_handle = JNIHandles::make_global(thread_oop);
943 _compiler1_objects[i] = thread_handle;
944 _compiler1_logs[i] = NULL;
945
946 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
947 JavaThread *ct = make_thread(thread_handle, _c1_compile_queue, _compilers[0], THREAD);
948 assert(ct != NULL, "should have been handled for initial thread");
949 _compilers[0]->set_num_compiler_threads(i + 1);
950 if (TraceCompilerThreads) {
951 ResourceMark rm;
952 MutexLocker mu(Threads_lock);
953 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
954 }
955 }
956 }
957
958 if (UsePerfData) {
959 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
960 }
961
962 if (MethodFlushing) {
963 // Initialize the sweeper thread
964 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK);
965 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
966 make_thread(thread_handle, NULL, NULL, THREAD);
967 }
968 }
969
970 void CompileBroker::possibly_add_compiler_threads(Thread* THREAD) {
971
972 julong available_memory = os::available_memory();
973 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
974 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
975 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
976
977 // Only do attempt to start additional threads if the lock is free.
978 if (!CompileThread_lock->try_lock()) return;
979
980 if (_c2_compile_queue != NULL) {
981 int old_c2_count = _compilers[1]->num_compiler_threads();
982 int new_c2_count = MIN4(_c2_count,
983 _c2_compile_queue->size() / 2,
984 (int)(available_memory / (200*M)),
985 (int)(available_cc_np / (128*K)));
986
987 for (int i = old_c2_count; i < new_c2_count; i++) {
988 #if INCLUDE_JVMCI
989 if (UseJVMCICompiler) {
990 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
991 // objects as their existence is completely hidden from the rest of
992 // the VM (and those compiler threads can't call Java code to do the
993 // creation anyway). For JVMCI we have to create new j.l.Thread objects
994 // as they are visible and we can see unexpected thread lifecycle
995 // transitions if we bind them to new JavaThreads.
996 if (!THREAD->can_call_java()) break;
997 char name_buffer[256];
998 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
999 Handle thread_oop;
1000 {
1001 // We have to give up the lock temporarily for the Java calls.
1002 MutexUnlocker mu(CompileThread_lock);
1003 thread_oop = create_thread_oop(name_buffer, THREAD);
1004 }
1005 if (HAS_PENDING_EXCEPTION) {
1006 if (TraceCompilerThreads) {
1007 ResourceMark rm;
1008 tty->print_cr("JVMCI compiler thread creation failed:");
1009 PENDING_EXCEPTION->print();
1010 }
1011 CLEAR_PENDING_EXCEPTION;
1012 break;
1013 }
1014 // Check if another thread has beaten us during the Java calls.
1015 if (_compilers[1]->num_compiler_threads() != i) break;
1016 jobject thread_handle = JNIHandles::make_global(thread_oop);
1017 assert(compiler2_object(i) == NULL, "Old one must be released!");
1018 _compiler2_objects[i] = thread_handle;
1019 }
1020 #endif
1021 JavaThread *ct = make_thread(compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1022 if (ct == NULL) break;
1023 _compilers[1]->set_num_compiler_threads(i + 1);
1024 if (TraceCompilerThreads) {
1025 ResourceMark rm;
1026 MutexLocker mu(Threads_lock);
1027 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
1028 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M));
1029 }
1030 }
1031 }
1032
1033 if (_c1_compile_queue != NULL) {
1034 int old_c1_count = _compilers[0]->num_compiler_threads();
1035 int new_c1_count = MIN4(_c1_count,
1036 _c1_compile_queue->size() / 4,
1037 (int)(available_memory / (100*M)),
1038 (int)(available_cc_p / (128*K)));
1039
1040 for (int i = old_c1_count; i < new_c1_count; i++) {
1041 JavaThread *ct = make_thread(compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1042 if (ct == NULL) break;
1043 _compilers[0]->set_num_compiler_threads(i + 1);
1044 if (TraceCompilerThreads) {
1045 ResourceMark rm;
1046 MutexLocker mu(Threads_lock);
1047 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
1048 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M));
1049 }
1050 }
1051 }
1052
1053 CompileThread_lock->unlock();
1054 }
1055
1056
1057 /**
1058 * Set the methods on the stack as on_stack so that redefine classes doesn't
1059 * reclaim them. This method is executed at a safepoint.
1060 */
1061 void CompileBroker::mark_on_stack() {
1062 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1063 // Since we are at a safepoint, we do not need a lock to access
1064 // the compile queues.
1065 if (_c2_compile_queue != NULL) {
1066 _c2_compile_queue->mark_on_stack();
1067 }
1068 if (_c1_compile_queue != NULL) {
1069 _c1_compile_queue->mark_on_stack();
1070 }
1071 }
1072
1073 // ------------------------------------------------------------------
1074 // CompileBroker::compile_method
1075 //
1076 // Request compilation of a method.
1077 void CompileBroker::compile_method_base(const methodHandle& method,
1078 int osr_bci,
1079 int comp_level,
1080 const methodHandle& hot_method,
1081 int hot_count,
1082 CompileTask::CompileReason compile_reason,
1083 bool blocking,
1084 Thread* thread) {
1085 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1086 assert(method->method_holder()->is_instance_klass(),
1087 "sanity check");
1088 assert(!method->method_holder()->is_not_initialized(),
1089 "method holder must be initialized");
1090 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1091
1092 if (CIPrintRequests) {
1093 tty->print("request: ");
1094 method->print_short_name(tty);
1095 if (osr_bci != InvocationEntryBci) {
1096 tty->print(" osr_bci: %d", osr_bci);
1097 }
1098 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1099 if (!hot_method.is_null()) {
1100 tty->print(" hot: ");
1101 if (hot_method() != method()) {
1102 hot_method->print_short_name(tty);
1103 } else {
1104 tty->print("yes");
1105 }
1106 }
1107 tty->cr();
1108 }
1109
1110 // A request has been made for compilation. Before we do any
1111 // real work, check to see if the method has been compiled
1112 // in the meantime with a definitive result.
1113 if (compilation_is_complete(method, osr_bci, comp_level)) {
1114 return;
1115 }
1116
1117 #ifndef PRODUCT
1118 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1119 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1120 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1121 return;
1122 }
1123 }
1124 #endif
1125
1126 // If this method is already in the compile queue, then
1127 // we do not block the current thread.
1128 if (compilation_is_in_queue(method)) {
1129 // We may want to decay our counter a bit here to prevent
1130 // multiple denied requests for compilation. This is an
1131 // open compilation policy issue. Note: The other possibility,
1132 // in the case that this is a blocking compile request, is to have
1133 // all subsequent blocking requesters wait for completion of
1134 // ongoing compiles. Note that in this case we'll need a protocol
1135 // for freeing the associated compile tasks. [Or we could have
1136 // a single static monitor on which all these waiters sleep.]
1137 return;
1138 }
1139
1140 if (TieredCompilation) {
1141 // Tiered policy requires MethodCounters to exist before adding a method to
1142 // the queue. Create if we don't have them yet.
1143 method->get_method_counters(thread);
1144 }
1145
1146 // Outputs from the following MutexLocker block:
1147 CompileTask* task = NULL;
1148 CompileQueue* queue = compile_queue(comp_level);
1149
1150 // Acquire our lock.
1151 {
1152 MutexLocker locker(thread, MethodCompileQueue_lock);
1153
1154 // Make sure the method has not slipped into the queues since
1155 // last we checked; note that those checks were "fast bail-outs".
1156 // Here we need to be more careful, see 14012000 below.
1157 if (compilation_is_in_queue(method)) {
1158 return;
1159 }
1160
1161 // We need to check again to see if the compilation has
1162 // completed. A previous compilation may have registered
1163 // some result.
1164 if (compilation_is_complete(method, osr_bci, comp_level)) {
1165 return;
1166 }
1167
1168 // We now know that this compilation is not pending, complete,
1169 // or prohibited. Assign a compile_id to this compilation
1170 // and check to see if it is in our [Start..Stop) range.
1171 int compile_id = assign_compile_id(method, osr_bci);
1172 if (compile_id == 0) {
1173 // The compilation falls outside the allowed range.
1174 return;
1175 }
1176
1177 #if INCLUDE_JVMCI
1178 if (UseJVMCICompiler && blocking) {
1179 // Don't allow blocking compiles for requests triggered by JVMCI.
1180 if (thread->is_Compiler_thread()) {
1181 blocking = false;
1182 }
1183
1184 if (!UseJVMCINativeLibrary) {
1185 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1186 vframeStream vfst((JavaThread*) thread);
1187 for (; !vfst.at_end(); vfst.next()) {
1188 if (vfst.method()->is_static_initializer() ||
1189 (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) &&
1190 vfst.method()->name() == vmSymbols::loadClass_name())) {
1191 blocking = false;
1192 break;
1193 }
1194 }
1195 }
1196
1197 // Don't allow blocking compilation requests to JVMCI
1198 // if JVMCI itself is not yet initialized
1199 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1200 blocking = false;
1201 }
1202
1203 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1204 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1205 // such as the DestroyJavaVM thread.
1206 if (JVMCI::in_shutdown()) {
1207 blocking = false;
1208 }
1209 }
1210 #endif // INCLUDE_JVMCI
1211
1212 // We will enter the compilation in the queue.
1213 // 14012000: Note that this sets the queued_for_compile bits in
1214 // the target method. We can now reason that a method cannot be
1215 // queued for compilation more than once, as follows:
1216 // Before a thread queues a task for compilation, it first acquires
1217 // the compile queue lock, then checks if the method's queued bits
1218 // are set or it has already been compiled. Thus there can not be two
1219 // instances of a compilation task for the same method on the
1220 // compilation queue. Consider now the case where the compilation
1221 // thread has already removed a task for that method from the queue
1222 // and is in the midst of compiling it. In this case, the
1223 // queued_for_compile bits must be set in the method (and these
1224 // will be visible to the current thread, since the bits were set
1225 // under protection of the compile queue lock, which we hold now.
1226 // When the compilation completes, the compiler thread first sets
1227 // the compilation result and then clears the queued_for_compile
1228 // bits. Neither of these actions are protected by a barrier (or done
1229 // under the protection of a lock), so the only guarantee we have
1230 // (on machines with TSO (Total Store Order)) is that these values
1231 // will update in that order. As a result, the only combinations of
1232 // these bits that the current thread will see are, in temporal order:
1233 // <RESULT, QUEUE> :
1234 // <0, 1> : in compile queue, but not yet compiled
1235 // <1, 1> : compiled but queue bit not cleared
1236 // <1, 0> : compiled and queue bit cleared
1237 // Because we first check the queue bits then check the result bits,
1238 // we are assured that we cannot introduce a duplicate task.
1239 // Note that if we did the tests in the reverse order (i.e. check
1240 // result then check queued bit), we could get the result bit before
1241 // the compilation completed, and the queue bit after the compilation
1242 // completed, and end up introducing a "duplicate" (redundant) task.
1243 // In that case, the compiler thread should first check if a method
1244 // has already been compiled before trying to compile it.
1245 // NOTE: in the event that there are multiple compiler threads and
1246 // there is de-optimization/recompilation, things will get hairy,
1247 // and in that case it's best to protect both the testing (here) of
1248 // these bits, and their updating (here and elsewhere) under a
1249 // common lock.
1250 task = create_compile_task(queue,
1251 compile_id, method,
1252 osr_bci, comp_level,
1253 hot_method, hot_count, compile_reason,
1254 blocking);
1255 }
1256
1257 if (blocking) {
1258 wait_for_completion(task);
1259 }
1260 }
1261
1262 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1263 int comp_level,
1264 const methodHandle& hot_method, int hot_count,
1265 CompileTask::CompileReason compile_reason,
1266 Thread* THREAD) {
1267 // Do nothing if compilebroker is not initalized or compiles are submitted on level none
1268 if (!_initialized || comp_level == CompLevel_none) {
1269 return NULL;
1270 }
1271
1272 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1273 assert(comp != NULL, "Ensure we have a compiler");
1274
1275 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1276 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1277 DirectivesStack::release(directive);
1278 return nm;
1279 }
1280
1281 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1282 int comp_level,
1283 const methodHandle& hot_method, int hot_count,
1284 CompileTask::CompileReason compile_reason,
1285 DirectiveSet* directive,
1286 Thread* THREAD) {
1287
1288 // make sure arguments make sense
1289 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1290 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1291 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1292 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1293 assert(!TieredCompilation || comp_level <= TieredStopAtLevel, "Invalid compilation level");
1294 // allow any levels for WhiteBox
1295 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1296 // return quickly if possible
1297
1298 // lock, make sure that the compilation
1299 // isn't prohibited in a straightforward way.
1300 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1301 if (comp == NULL || !comp->can_compile_method(method) ||
1302 compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1303 return NULL;
1304 }
1305
1306 #if INCLUDE_JVMCI
1307 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1308 return NULL;
1309 }
1310 #endif
1311
1312 if (osr_bci == InvocationEntryBci) {
1313 // standard compilation
1314 CompiledMethod* method_code = method->code();
1315 if (method_code != NULL && method_code->is_nmethod()) {
1316 if (compilation_is_complete(method, osr_bci, comp_level)) {
1317 return (nmethod*) method_code;
1318 }
1319 }
1320 if (method->is_not_compilable(comp_level)) {
1321 return NULL;
1322 }
1323 } else {
1324 // osr compilation
1325 #ifndef TIERED
1326 // seems like an assert of dubious value
1327 assert(comp_level == CompLevel_highest_tier,
1328 "all OSR compiles are assumed to be at a single compilation level");
1329 #endif // TIERED
1330 // We accept a higher level osr method
1331 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1332 if (nm != NULL) return nm;
1333 if (method->is_not_osr_compilable(comp_level)) return NULL;
1334 }
1335
1336 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1337 // some prerequisites that are compiler specific
1338 if (comp->is_c2()) {
1339 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1340 // Resolve all classes seen in the signature of the method
1341 // we are compiling.
1342 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1343 }
1344
1345 // If the method is native, do the lookup in the thread requesting
1346 // the compilation. Native lookups can load code, which is not
1347 // permitted during compilation.
1348 //
1349 // Note: A native method implies non-osr compilation which is
1350 // checked with an assertion at the entry of this method.
1351 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1352 bool in_base_library;
1353 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1354 if (HAS_PENDING_EXCEPTION) {
1355 // In case of an exception looking up the method, we just forget
1356 // about it. The interpreter will kick-in and throw the exception.
1357 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1358 CLEAR_PENDING_EXCEPTION;
1359 return NULL;
1360 }
1361 assert(method->has_native_function(), "must have native code by now");
1362 }
1363
1364 // RedefineClasses() has replaced this method; just return
1365 if (method->is_old()) {
1366 return NULL;
1367 }
1368
1369 // JVMTI -- post_compile_event requires jmethod_id() that may require
1370 // a lock the compiling thread can not acquire. Prefetch it here.
1371 if (JvmtiExport::should_post_compiled_method_load()) {
1372 method->jmethod_id();
1373 }
1374
1375 // do the compilation
1376 if (method->is_native()) {
1377 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1378 #if defined(X86) && !defined(ZERO)
1379 // The following native methods:
1380 //
1381 // java.lang.Float.intBitsToFloat
1382 // java.lang.Float.floatToRawIntBits
1383 // java.lang.Double.longBitsToDouble
1384 // java.lang.Double.doubleToRawLongBits
1385 //
1386 // are called through the interpreter even if interpreter native stubs
1387 // are not preferred (i.e., calling through adapter handlers is preferred).
1388 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1389 // if the version of the methods from the native libraries is called.
1390 // As the interpreter and the C2-intrinsified version of the methods preserves
1391 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1392 if ((UseSSE >= 1 &&
1393 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1394 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1395 (UseSSE >= 2 &&
1396 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1397 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1398 return NULL;
1399 }
1400 #endif // X86 && !ZERO
1401
1402 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1403 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1404 //
1405 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1406 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1407 AdapterHandlerLibrary::create_native_wrapper(method);
1408 } else {
1409 return NULL;
1410 }
1411 } else {
1412 // If the compiler is shut off due to code cache getting full
1413 // fail out now so blocking compiles dont hang the java thread
1414 if (!should_compile_new_jobs()) {
1415 CompilationPolicy::policy()->delay_compilation(method());
1416 return NULL;
1417 }
1418 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1419 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1420 }
1421
1422 // return requested nmethod
1423 // We accept a higher level osr method
1424 if (osr_bci == InvocationEntryBci) {
1425 CompiledMethod* code = method->code();
1426 if (code == NULL) {
1427 return (nmethod*) code;
1428 } else {
1429 return code->as_nmethod_or_null();
1430 }
1431 }
1432 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1433 }
1434
1435
1436 // ------------------------------------------------------------------
1437 // CompileBroker::compilation_is_complete
1438 //
1439 // See if compilation of this method is already complete.
1440 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1441 int osr_bci,
1442 int comp_level) {
1443 bool is_osr = (osr_bci != standard_entry_bci);
1444 if (is_osr) {
1445 if (method->is_not_osr_compilable(comp_level)) {
1446 return true;
1447 } else {
1448 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1449 return (result != NULL);
1450 }
1451 } else {
1452 if (method->is_not_compilable(comp_level)) {
1453 return true;
1454 } else {
1455 CompiledMethod* result = method->code();
1456 if (result == NULL) return false;
1457 return comp_level == result->comp_level();
1458 }
1459 }
1460 }
1461
1462
1463 /**
1464 * See if this compilation is already requested.
1465 *
1466 * Implementation note: there is only a single "is in queue" bit
1467 * for each method. This means that the check below is overly
1468 * conservative in the sense that an osr compilation in the queue
1469 * will block a normal compilation from entering the queue (and vice
1470 * versa). This can be remedied by a full queue search to disambiguate
1471 * cases. If it is deemed profitable, this may be done.
1472 */
1473 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1474 return method->queued_for_compilation();
1475 }
1476
1477 // ------------------------------------------------------------------
1478 // CompileBroker::compilation_is_prohibited
1479 //
1480 // See if this compilation is not allowed.
1481 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1482 bool is_native = method->is_native();
1483 // Some compilers may not support the compilation of natives.
1484 AbstractCompiler *comp = compiler(comp_level);
1485 if (is_native &&
1486 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1487 method->set_not_compilable_quietly("native methods not supported", comp_level);
1488 return true;
1489 }
1490
1491 bool is_osr = (osr_bci != standard_entry_bci);
1492 // Some compilers may not support on stack replacement.
1493 if (is_osr &&
1494 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1495 method->set_not_osr_compilable("OSR not supported", comp_level);
1496 return true;
1497 }
1498
1499 // The method may be explicitly excluded by the user.
1500 double scale;
1501 if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1502 bool quietly = CompilerOracle::should_exclude_quietly();
1503 if (PrintCompilation && !quietly) {
1504 // This does not happen quietly...
1505 ResourceMark rm;
1506 tty->print("### Excluding %s:%s",
1507 method->is_native() ? "generation of native wrapper" : "compile",
1508 (method->is_static() ? " static" : ""));
1509 method->print_short_name(tty);
1510 tty->cr();
1511 }
1512 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1513 }
1514
1515 return false;
1516 }
1517
1518 /**
1519 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1520 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1521 * The function also allows to generate separate compilation IDs for OSR compilations.
1522 */
1523 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1524 #ifdef ASSERT
1525 bool is_osr = (osr_bci != standard_entry_bci);
1526 int id;
1527 if (method->is_native()) {
1528 assert(!is_osr, "can't be osr");
1529 // Adapters, native wrappers and method handle intrinsics
1530 // should be generated always.
1531 return Atomic::add(&_compilation_id, 1);
1532 } else if (CICountOSR && is_osr) {
1533 id = Atomic::add(&_osr_compilation_id, 1);
1534 if (CIStartOSR <= id && id < CIStopOSR) {
1535 return id;
1536 }
1537 } else {
1538 id = Atomic::add(&_compilation_id, 1);
1539 if (CIStart <= id && id < CIStop) {
1540 return id;
1541 }
1542 }
1543
1544 // Method was not in the appropriate compilation range.
1545 method->set_not_compilable_quietly("Not in requested compile id range");
1546 return 0;
1547 #else
1548 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1549 // only _compilation_id is incremented.
1550 return Atomic::add(&_compilation_id, 1);
1551 #endif
1552 }
1553
1554 // ------------------------------------------------------------------
1555 // CompileBroker::assign_compile_id_unlocked
1556 //
1557 // Public wrapper for assign_compile_id that acquires the needed locks
1558 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1559 MutexLocker locker(thread, MethodCompileQueue_lock);
1560 return assign_compile_id(method, osr_bci);
1561 }
1562
1563 // ------------------------------------------------------------------
1564 // CompileBroker::create_compile_task
1565 //
1566 // Create a CompileTask object representing the current request for
1567 // compilation. Add this task to the queue.
1568 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1569 int compile_id,
1570 const methodHandle& method,
1571 int osr_bci,
1572 int comp_level,
1573 const methodHandle& hot_method,
1574 int hot_count,
1575 CompileTask::CompileReason compile_reason,
1576 bool blocking) {
1577 CompileTask* new_task = CompileTask::allocate();
1578 new_task->initialize(compile_id, method, osr_bci, comp_level,
1579 hot_method, hot_count, compile_reason,
1580 blocking);
1581 queue->add(new_task);
1582 return new_task;
1583 }
1584
1585 #if INCLUDE_JVMCI
1586 // The number of milliseconds to wait before checking if
1587 // JVMCI compilation has made progress.
1588 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1589
1590 // The number of JVMCI compilation progress checks that must fail
1591 // before unblocking a thread waiting for a blocking compilation.
1592 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1593
1594 /**
1595 * Waits for a JVMCI compiler to complete a given task. This thread
1596 * waits until either the task completes or it sees no JVMCI compilation
1597 * progress for N consecutive milliseconds where N is
1598 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1599 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1600 *
1601 * @return true if this thread needs to free/recycle the task
1602 */
1603 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1604 assert(UseJVMCICompiler, "sanity");
1605 MonitorLocker ml(thread, task->lock());
1606 int progress_wait_attempts = 0;
1607 int methods_compiled = jvmci->methods_compiled();
1608 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1609 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1610 CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread();
1611
1612 bool progress;
1613 if (jvmci_compiler_thread != NULL) {
1614 // If the JVMCI compiler thread is not blocked or suspended, we deem it to be making progress.
1615 progress = jvmci_compiler_thread->thread_state() != _thread_blocked &&
1616 !jvmci_compiler_thread->is_external_suspend();
1617 } else {
1618 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1619 // that all JVMCI compiler threads are blocked on. We use the counter for
1620 // successful JVMCI compilations to determine whether JVMCI compilation
1621 // is still making progress through the JVMCI compiler queue.
1622 progress = jvmci->methods_compiled() != methods_compiled;
1623 }
1624
1625 if (!progress) {
1626 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1627 if (PrintCompilation) {
1628 task->print(tty, "wait for blocking compilation timed out");
1629 }
1630 break;
1631 }
1632 } else {
1633 progress_wait_attempts = 0;
1634 if (jvmci_compiler_thread == NULL) {
1635 methods_compiled = jvmci->methods_compiled();
1636 }
1637 }
1638 }
1639 task->clear_waiter();
1640 return task->is_complete();
1641 }
1642 #endif
1643
1644 /**
1645 * Wait for the compilation task to complete.
1646 */
1647 void CompileBroker::wait_for_completion(CompileTask* task) {
1648 if (CIPrintCompileQueue) {
1649 ttyLocker ttyl;
1650 tty->print_cr("BLOCKING FOR COMPILE");
1651 }
1652
1653 assert(task->is_blocking(), "can only wait on blocking task");
1654
1655 JavaThread* thread = JavaThread::current();
1656
1657 methodHandle method(thread, task->method());
1658 bool free_task;
1659 #if INCLUDE_JVMCI
1660 AbstractCompiler* comp = compiler(task->comp_level());
1661 if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
1662 // It may return before compilation is completed.
1663 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1664 } else
1665 #endif
1666 {
1667 MonitorLocker ml(thread, task->lock());
1668 free_task = true;
1669 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1670 ml.wait();
1671 }
1672 }
1673
1674 if (free_task) {
1675 if (is_compilation_disabled_forever()) {
1676 CompileTask::free(task);
1677 return;
1678 }
1679
1680 // It is harmless to check this status without the lock, because
1681 // completion is a stable property (until the task object is recycled).
1682 assert(task->is_complete(), "Compilation should have completed");
1683 assert(task->code_handle() == NULL, "must be reset");
1684
1685 // By convention, the waiter is responsible for recycling a
1686 // blocking CompileTask. Since there is only one waiter ever
1687 // waiting on a CompileTask, we know that no one else will
1688 // be using this CompileTask; we can free it.
1689 CompileTask::free(task);
1690 }
1691 }
1692
1693 /**
1694 * Initialize compiler thread(s) + compiler object(s). The postcondition
1695 * of this function is that the compiler runtimes are initialized and that
1696 * compiler threads can start compiling.
1697 */
1698 bool CompileBroker::init_compiler_runtime() {
1699 CompilerThread* thread = CompilerThread::current();
1700 AbstractCompiler* comp = thread->compiler();
1701 // Final sanity check - the compiler object must exist
1702 guarantee(comp != NULL, "Compiler object must exist");
1703
1704 {
1705 // Must switch to native to allocate ci_env
1706 ThreadToNativeFromVM ttn(thread);
1707 ciEnv ci_env((CompileTask*)NULL);
1708 // Cache Jvmti state
1709 ci_env.cache_jvmti_state();
1710 // Cache DTrace flags
1711 ci_env.cache_dtrace_flags();
1712
1713 // Switch back to VM state to do compiler initialization
1714 ThreadInVMfromNative tv(thread);
1715 ResetNoHandleMark rnhm;
1716
1717 // Perform per-thread and global initializations
1718 comp->initialize();
1719 }
1720
1721 if (comp->is_failed()) {
1722 disable_compilation_forever();
1723 // If compiler initialization failed, no compiler thread that is specific to a
1724 // particular compiler runtime will ever start to compile methods.
1725 shutdown_compiler_runtime(comp, thread);
1726 return false;
1727 }
1728
1729 // C1 specific check
1730 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1731 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1732 return false;
1733 }
1734
1735 return true;
1736 }
1737
1738 /**
1739 * If C1 and/or C2 initialization failed, we shut down all compilation.
1740 * We do this to keep things simple. This can be changed if it ever turns
1741 * out to be a problem.
1742 */
1743 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1744 // Free buffer blob, if allocated
1745 if (thread->get_buffer_blob() != NULL) {
1746 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1747 CodeCache::free(thread->get_buffer_blob());
1748 }
1749
1750 if (comp->should_perform_shutdown()) {
1751 // There are two reasons for shutting down the compiler
1752 // 1) compiler runtime initialization failed
1753 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1754 warning("%s initialization failed. Shutting down all compilers", comp->name());
1755
1756 // Only one thread per compiler runtime object enters here
1757 // Set state to shut down
1758 comp->set_shut_down();
1759
1760 // Delete all queued compilation tasks to make compiler threads exit faster.
1761 if (_c1_compile_queue != NULL) {
1762 _c1_compile_queue->free_all();
1763 }
1764
1765 if (_c2_compile_queue != NULL) {
1766 _c2_compile_queue->free_all();
1767 }
1768
1769 // Set flags so that we continue execution with using interpreter only.
1770 UseCompiler = false;
1771 UseInterpreter = true;
1772
1773 // We could delete compiler runtimes also. However, there are references to
1774 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1775 // fail. This can be done later if necessary.
1776 }
1777 }
1778
1779 /**
1780 * Helper function to create new or reuse old CompileLog.
1781 */
1782 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1783 if (!LogCompilation) return NULL;
1784
1785 AbstractCompiler *compiler = ct->compiler();
1786 bool c1 = compiler->is_c1();
1787 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1788 assert(compiler_objects != NULL, "must be initialized at this point");
1789 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1790 assert(logs != NULL, "must be initialized at this point");
1791 int count = c1 ? _c1_count : _c2_count;
1792
1793 // Find Compiler number by its threadObj.
1794 oop compiler_obj = ct->threadObj();
1795 int compiler_number = 0;
1796 bool found = false;
1797 for (; compiler_number < count; compiler_number++) {
1798 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1799 found = true;
1800 break;
1801 }
1802 }
1803 assert(found, "Compiler must exist at this point");
1804
1805 // Determine pointer for this thread's log.
1806 CompileLog** log_ptr = &logs[compiler_number];
1807
1808 // Return old one if it exists.
1809 CompileLog* log = *log_ptr;
1810 if (log != NULL) {
1811 ct->init_log(log);
1812 return log;
1813 }
1814
1815 // Create a new one and remember it.
1816 init_compiler_thread_log();
1817 log = ct->log();
1818 *log_ptr = log;
1819 return log;
1820 }
1821
1822 // ------------------------------------------------------------------
1823 // CompileBroker::compiler_thread_loop
1824 //
1825 // The main loop run by a CompilerThread.
1826 void CompileBroker::compiler_thread_loop() {
1827 CompilerThread* thread = CompilerThread::current();
1828 CompileQueue* queue = thread->queue();
1829 // For the thread that initializes the ciObjectFactory
1830 // this resource mark holds all the shared objects
1831 ResourceMark rm;
1832
1833 // First thread to get here will initialize the compiler interface
1834
1835 {
1836 ASSERT_IN_VM;
1837 MutexLocker only_one (thread, CompileThread_lock);
1838 if (!ciObjectFactory::is_initialized()) {
1839 ciObjectFactory::initialize();
1840 }
1841 }
1842
1843 // Open a log.
1844 CompileLog* log = get_log(thread);
1845 if (log != NULL) {
1846 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1847 thread->name(),
1848 os::current_thread_id(),
1849 os::current_process_id());
1850 log->stamp();
1851 log->end_elem();
1852 }
1853
1854 // If compiler thread/runtime initialization fails, exit the compiler thread
1855 if (!init_compiler_runtime()) {
1856 return;
1857 }
1858
1859 thread->start_idle_timer();
1860
1861 // Poll for new compilation tasks as long as the JVM runs. Compilation
1862 // should only be disabled if something went wrong while initializing the
1863 // compiler runtimes. This, in turn, should not happen. The only known case
1864 // when compiler runtime initialization fails is if there is not enough free
1865 // space in the code cache to generate the necessary stubs, etc.
1866 while (!is_compilation_disabled_forever()) {
1867 // We need this HandleMark to avoid leaking VM handles.
1868 HandleMark hm(thread);
1869
1870 CompileTask* task = queue->get();
1871 if (task == NULL) {
1872 if (UseDynamicNumberOfCompilerThreads) {
1873 // Access compiler_count under lock to enforce consistency.
1874 MutexLocker only_one(CompileThread_lock);
1875 if (can_remove(thread, true)) {
1876 if (TraceCompilerThreads) {
1877 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1878 thread->name(), thread->idle_time_millis());
1879 }
1880 // Free buffer blob, if allocated
1881 if (thread->get_buffer_blob() != NULL) {
1882 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1883 CodeCache::free(thread->get_buffer_blob());
1884 }
1885 return; // Stop this thread.
1886 }
1887 }
1888 } else {
1889 // Assign the task to the current thread. Mark this compilation
1890 // thread as active for the profiler.
1891 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1892 // occurs after fetching the compile task off the queue.
1893 CompileTaskWrapper ctw(task);
1894 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1895 task->set_code_handle(&result_handle);
1896 methodHandle method(thread, task->method());
1897
1898 // Never compile a method if breakpoints are present in it
1899 if (method()->number_of_breakpoints() == 0) {
1900 // Compile the method.
1901 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1902 invoke_compiler_on_method(task);
1903 thread->start_idle_timer();
1904 } else {
1905 // After compilation is disabled, remove remaining methods from queue
1906 method->clear_queued_for_compilation();
1907 task->set_failure_reason("compilation is disabled");
1908 }
1909 }
1910
1911 if (UseDynamicNumberOfCompilerThreads) {
1912 possibly_add_compiler_threads(thread);
1913 assert(!thread->has_pending_exception(), "should have been handled");
1914 }
1915 }
1916 }
1917
1918 // Shut down compiler runtime
1919 shutdown_compiler_runtime(thread->compiler(), thread);
1920 }
1921
1922 // ------------------------------------------------------------------
1923 // CompileBroker::init_compiler_thread_log
1924 //
1925 // Set up state required by +LogCompilation.
1926 void CompileBroker::init_compiler_thread_log() {
1927 CompilerThread* thread = CompilerThread::current();
1928 char file_name[4*K];
1929 FILE* fp = NULL;
1930 intx thread_id = os::current_thread_id();
1931 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1932 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1933 if (dir == NULL) {
1934 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1935 thread_id, os::current_process_id());
1936 } else {
1937 jio_snprintf(file_name, sizeof(file_name),
1938 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
1939 os::file_separator(), thread_id, os::current_process_id());
1940 }
1941
1942 fp = fopen(file_name, "wt");
1943 if (fp != NULL) {
1944 if (LogCompilation && Verbose) {
1945 tty->print_cr("Opening compilation log %s", file_name);
1946 }
1947 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
1948 if (log == NULL) {
1949 fclose(fp);
1950 return;
1951 }
1952 thread->init_log(log);
1953
1954 if (xtty != NULL) {
1955 ttyLocker ttyl;
1956 // Record any per thread log files
1957 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
1958 }
1959 return;
1960 }
1961 }
1962 warning("Cannot open log file: %s", file_name);
1963 }
1964
1965 void CompileBroker::log_metaspace_failure() {
1966 const char* message = "some methods may not be compiled because metaspace "
1967 "is out of memory";
1968 if (_compilation_log != NULL) {
1969 _compilation_log->log_metaspace_failure(message);
1970 }
1971 if (PrintCompilation) {
1972 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
1973 }
1974 }
1975
1976
1977 // ------------------------------------------------------------------
1978 // CompileBroker::set_should_block
1979 //
1980 // Set _should_block.
1981 // Call this from the VM, with Threads_lock held and a safepoint requested.
1982 void CompileBroker::set_should_block() {
1983 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
1984 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
1985 #ifndef PRODUCT
1986 if (PrintCompilation && (Verbose || WizardMode))
1987 tty->print_cr("notifying compiler thread pool to block");
1988 #endif
1989 _should_block = true;
1990 }
1991
1992 // ------------------------------------------------------------------
1993 // CompileBroker::maybe_block
1994 //
1995 // Call this from the compiler at convenient points, to poll for _should_block.
1996 void CompileBroker::maybe_block() {
1997 if (_should_block) {
1998 #ifndef PRODUCT
1999 if (PrintCompilation && (Verbose || WizardMode))
2000 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2001 #endif
2002 ThreadInVMfromNative tivfn(JavaThread::current());
2003 }
2004 }
2005
2006 // wrapper for CodeCache::print_summary()
2007 static void codecache_print(bool detailed)
2008 {
2009 ResourceMark rm;
2010 stringStream s;
2011 // Dump code cache into a buffer before locking the tty,
2012 {
2013 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2014 CodeCache::print_summary(&s, detailed);
2015 }
2016 ttyLocker ttyl;
2017 tty->print("%s", s.as_string());
2018 }
2019
2020 // wrapper for CodeCache::print_summary() using outputStream
2021 static void codecache_print(outputStream* out, bool detailed) {
2022 ResourceMark rm;
2023 stringStream s;
2024
2025 // Dump code cache into a buffer
2026 {
2027 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2028 CodeCache::print_summary(&s, detailed);
2029 }
2030
2031 char* remaining_log = s.as_string();
2032 while (*remaining_log != '\0') {
2033 char* eol = strchr(remaining_log, '\n');
2034 if (eol == NULL) {
2035 out->print_cr("%s", remaining_log);
2036 remaining_log = remaining_log + strlen(remaining_log);
2037 } else {
2038 *eol = '\0';
2039 out->print_cr("%s", remaining_log);
2040 remaining_log = eol + 1;
2041 }
2042 }
2043 }
2044
2045 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env,
2046 int compilable, const char* failure_reason) {
2047 if (success) {
2048 task->mark_success();
2049 if (ci_env != NULL) {
2050 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
2051 }
2052 if (_compilation_log != NULL) {
2053 nmethod* code = task->code();
2054 if (code != NULL) {
2055 _compilation_log->log_nmethod(thread, code);
2056 }
2057 }
2058 } else if (AbortVMOnCompilationFailure) {
2059 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2060 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2061 }
2062 if (compilable == ciEnv::MethodCompilable_never) {
2063 fatal("Never compilable: %s", failure_reason);
2064 }
2065 }
2066 // simulate crash during compilation
2067 assert(task->compile_id() != CICrashAt, "just as planned");
2068 }
2069
2070 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2071 assert(task != NULL, "invariant");
2072 CompilerEvent::CompilationEvent::post(event,
2073 task->compile_id(),
2074 task->compiler()->type(),
2075 task->method(),
2076 task->comp_level(),
2077 task->is_success(),
2078 task->osr_bci() != CompileBroker::standard_entry_bci,
2079 (task->code() == NULL) ? 0 : task->code()->total_size(),
2080 task->num_inlined_bytecodes());
2081 }
2082
2083 int DirectivesStack::_depth = 0;
2084 CompilerDirectives* DirectivesStack::_top = NULL;
2085 CompilerDirectives* DirectivesStack::_bottom = NULL;
2086
2087 // ------------------------------------------------------------------
2088 // CompileBroker::invoke_compiler_on_method
2089 //
2090 // Compile a method.
2091 //
2092 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2093 task->print_ul();
2094 if (PrintCompilation) {
2095 ResourceMark rm;
2096 task->print_tty();
2097 }
2098 elapsedTimer time;
2099
2100 CompilerThread* thread = CompilerThread::current();
2101 ResourceMark rm(thread);
2102
2103 if (LogEvents) {
2104 _compilation_log->log_compile(thread, task);
2105 }
2106
2107 // Common flags.
2108 uint compile_id = task->compile_id();
2109 int osr_bci = task->osr_bci();
2110 bool is_osr = (osr_bci != standard_entry_bci);
2111 bool should_log = (thread->log() != NULL);
2112 bool should_break = false;
2113 const int task_level = task->comp_level();
2114 AbstractCompiler* comp = task->compiler();
2115
2116 DirectiveSet* directive;
2117 {
2118 // create the handle inside it's own block so it can't
2119 // accidentally be referenced once the thread transitions to
2120 // native. The NoHandleMark before the transition should catch
2121 // any cases where this occurs in the future.
2122 methodHandle method(thread, task->method());
2123 assert(!method->is_native(), "no longer compile natives");
2124
2125 // Look up matching directives
2126 directive = DirectivesStack::getMatchingDirective(method, comp);
2127
2128 // Update compile information when using perfdata.
2129 if (UsePerfData) {
2130 update_compile_perf_data(thread, method, is_osr);
2131 }
2132
2133 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2134 }
2135
2136 should_break = directive->BreakAtExecuteOption || task->check_break_at_flags();
2137 if (should_log && !directive->LogOption) {
2138 should_log = false;
2139 }
2140
2141 // Allocate a new set of JNI handles.
2142 push_jni_handle_block();
2143 Method* target_handle = task->method();
2144 int compilable = ciEnv::MethodCompilable;
2145 const char* failure_reason = NULL;
2146 bool failure_reason_on_C_heap = false;
2147 const char* retry_message = NULL;
2148
2149 #if INCLUDE_JVMCI
2150 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2151 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2152
2153 TraceTime t1("compilation", &time);
2154 EventCompilation event;
2155 JVMCICompileState compile_state(task);
2156 JVMCIRuntime *runtime = NULL;
2157
2158 if (JVMCI::in_shutdown()) {
2159 failure_reason = "in JVMCI shutdown";
2160 retry_message = "not retryable";
2161 compilable = ciEnv::MethodCompilable_never;
2162 } else if (compile_state.target_method_is_old()) {
2163 // Skip redefined methods
2164 failure_reason = "redefined method";
2165 retry_message = "not retryable";
2166 compilable = ciEnv::MethodCompilable_never;
2167 } else {
2168 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2169 methodHandle method(thread, target_handle);
2170 runtime = env.runtime();
2171 runtime->compile_method(&env, jvmci, method, osr_bci);
2172
2173 failure_reason = compile_state.failure_reason();
2174 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2175 if (!compile_state.retryable()) {
2176 retry_message = "not retryable";
2177 compilable = ciEnv::MethodCompilable_not_at_tier;
2178 }
2179 if (task->code() == NULL) {
2180 assert(failure_reason != NULL, "must specify failure_reason");
2181 }
2182 }
2183 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason);
2184 if (event.should_commit()) {
2185 post_compilation_event(event, task);
2186 }
2187
2188 } else
2189 #endif // INCLUDE_JVMCI
2190 {
2191 NoHandleMark nhm;
2192 ThreadToNativeFromVM ttn(thread);
2193
2194 ciEnv ci_env(task);
2195 if (should_break) {
2196 ci_env.set_break_at_compile(true);
2197 }
2198 if (should_log) {
2199 ci_env.set_log(thread->log());
2200 }
2201 assert(thread->env() == &ci_env, "set by ci_env");
2202 // The thread-env() field is cleared in ~CompileTaskWrapper.
2203
2204 // Cache Jvmti state
2205 bool method_is_old = ci_env.cache_jvmti_state();
2206
2207 // Skip redefined methods
2208 if (method_is_old) {
2209 ci_env.record_method_not_compilable("redefined method", true);
2210 }
2211
2212 // Cache DTrace flags
2213 ci_env.cache_dtrace_flags();
2214
2215 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2216
2217 TraceTime t1("compilation", &time);
2218 EventCompilation event;
2219
2220 if (comp == NULL) {
2221 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2222 } else if (!ci_env.failing()) {
2223 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2224 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2225 while (WhiteBox::compilation_locked) {
2226 locker.wait();
2227 }
2228 }
2229 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2230
2231 /* Repeat compilation without installing code for profiling purposes */
2232 int repeat_compilation_count = directive->RepeatCompilationOption;
2233 while (repeat_compilation_count > 0) {
2234 task->print_ul("NO CODE INSTALLED");
2235 comp->compile_method(&ci_env, target, osr_bci, false , directive);
2236 repeat_compilation_count--;
2237 }
2238 }
2239
2240 if (!ci_env.failing() && task->code() == NULL) {
2241 //assert(false, "compiler should always document failure");
2242 // The compiler elected, without comment, not to register a result.
2243 // Do not attempt further compilations of this method.
2244 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2245 }
2246
2247 // Copy this bit to the enclosing block:
2248 compilable = ci_env.compilable();
2249
2250 if (ci_env.failing()) {
2251 failure_reason = ci_env.failure_reason();
2252 retry_message = ci_env.retry_message();
2253 ci_env.report_failure(failure_reason);
2254 }
2255
2256 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason);
2257 if (event.should_commit()) {
2258 post_compilation_event(event, task);
2259 }
2260 }
2261 // Remove the JNI handle block after the ciEnv destructor has run in
2262 // the previous block.
2263 pop_jni_handle_block();
2264
2265 if (failure_reason != NULL) {
2266 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2267 if (_compilation_log != NULL) {
2268 _compilation_log->log_failure(thread, task, failure_reason, retry_message);
2269 }
2270 if (PrintCompilation) {
2271 FormatBufferResource msg = retry_message != NULL ?
2272 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2273 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2274 task->print(tty, msg);
2275 }
2276 }
2277
2278 methodHandle method(thread, task->method());
2279
2280 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2281
2282 collect_statistics(thread, time, task);
2283
2284 nmethod* nm = task->code();
2285 if (nm != NULL) {
2286 nm->maybe_print_nmethod(directive);
2287 }
2288 DirectivesStack::release(directive);
2289
2290 if (PrintCompilation && PrintCompilation2) {
2291 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2292 tty->print("%4d ", compile_id); // print compilation number
2293 tty->print("%s ", (is_osr ? "%" : " "));
2294 if (task->code() != NULL) {
2295 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2296 }
2297 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2298 }
2299
2300 Log(compilation, codecache) log;
2301 if (log.is_debug()) {
2302 LogStream ls(log.debug());
2303 codecache_print(&ls, /* detailed= */ false);
2304 }
2305 if (PrintCodeCacheOnCompilation) {
2306 codecache_print(/* detailed= */ false);
2307 }
2308 // Disable compilation, if required.
2309 switch (compilable) {
2310 case ciEnv::MethodCompilable_never:
2311 if (is_osr)
2312 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2313 else
2314 method->set_not_compilable_quietly("MethodCompilable_never");
2315 break;
2316 case ciEnv::MethodCompilable_not_at_tier:
2317 if (is_osr)
2318 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2319 else
2320 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2321 break;
2322 }
2323
2324 // Note that the queued_for_compilation bits are cleared without
2325 // protection of a mutex. [They were set by the requester thread,
2326 // when adding the task to the compile queue -- at which time the
2327 // compile queue lock was held. Subsequently, we acquired the compile
2328 // queue lock to get this task off the compile queue; thus (to belabour
2329 // the point somewhat) our clearing of the bits must be occurring
2330 // only after the setting of the bits. See also 14012000 above.
2331 method->clear_queued_for_compilation();
2332 }
2333
2334 /**
2335 * The CodeCache is full. Print warning and disable compilation.
2336 * Schedule code cache cleaning so compilation can continue later.
2337 * This function needs to be called only from CodeCache::allocate(),
2338 * since we currently handle a full code cache uniformly.
2339 */
2340 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2341 UseInterpreter = true;
2342 if (UseCompiler || AlwaysCompileLoopMethods ) {
2343 if (xtty != NULL) {
2344 ResourceMark rm;
2345 stringStream s;
2346 // Dump code cache state into a buffer before locking the tty,
2347 // because log_state() will use locks causing lock conflicts.
2348 CodeCache::log_state(&s);
2349 // Lock to prevent tearing
2350 ttyLocker ttyl;
2351 xtty->begin_elem("code_cache_full");
2352 xtty->print("%s", s.as_string());
2353 xtty->stamp();
2354 xtty->end_elem();
2355 }
2356
2357 #ifndef PRODUCT
2358 if (ExitOnFullCodeCache) {
2359 codecache_print(/* detailed= */ true);
2360 before_exit(JavaThread::current());
2361 exit_globals(); // will delete tty
2362 vm_direct_exit(1);
2363 }
2364 #endif
2365 if (UseCodeCacheFlushing) {
2366 // Since code cache is full, immediately stop new compiles
2367 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2368 NMethodSweeper::log_sweep("disable_compiler");
2369 }
2370 } else {
2371 disable_compilation_forever();
2372 }
2373
2374 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2375 }
2376 }
2377
2378 // ------------------------------------------------------------------
2379 // CompileBroker::update_compile_perf_data
2380 //
2381 // Record this compilation for debugging purposes.
2382 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2383 ResourceMark rm;
2384 char* method_name = method->name()->as_C_string();
2385 char current_method[CompilerCounters::cmname_buffer_length];
2386 size_t maxLen = CompilerCounters::cmname_buffer_length;
2387
2388 const char* class_name = method->method_holder()->name()->as_C_string();
2389
2390 size_t s1len = strlen(class_name);
2391 size_t s2len = strlen(method_name);
2392
2393 // check if we need to truncate the string
2394 if (s1len + s2len + 2 > maxLen) {
2395
2396 // the strategy is to lop off the leading characters of the
2397 // class name and the trailing characters of the method name.
2398
2399 if (s2len + 2 > maxLen) {
2400 // lop of the entire class name string, let snprintf handle
2401 // truncation of the method name.
2402 class_name += s1len; // null string
2403 }
2404 else {
2405 // lop off the extra characters from the front of the class name
2406 class_name += ((s1len + s2len + 2) - maxLen);
2407 }
2408 }
2409
2410 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2411
2412 int last_compile_type = normal_compile;
2413 if (CICountOSR && is_osr) {
2414 last_compile_type = osr_compile;
2415 }
2416
2417 CompilerCounters* counters = thread->counters();
2418 counters->set_current_method(current_method);
2419 counters->set_compile_type((jlong) last_compile_type);
2420 }
2421
2422 // ------------------------------------------------------------------
2423 // CompileBroker::push_jni_handle_block
2424 //
2425 // Push on a new block of JNI handles.
2426 void CompileBroker::push_jni_handle_block() {
2427 JavaThread* thread = JavaThread::current();
2428
2429 // Allocate a new block for JNI handles.
2430 // Inlined code from jni_PushLocalFrame()
2431 JNIHandleBlock* java_handles = thread->active_handles();
2432 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2433 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2434 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2435 thread->set_active_handles(compile_handles);
2436 }
2437
2438
2439 // ------------------------------------------------------------------
2440 // CompileBroker::pop_jni_handle_block
2441 //
2442 // Pop off the current block of JNI handles.
2443 void CompileBroker::pop_jni_handle_block() {
2444 JavaThread* thread = JavaThread::current();
2445
2446 // Release our JNI handle block
2447 JNIHandleBlock* compile_handles = thread->active_handles();
2448 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2449 thread->set_active_handles(java_handles);
2450 compile_handles->set_pop_frame_link(NULL);
2451 JNIHandleBlock::release_block(compile_handles, thread); // may block
2452 }
2453
2454 // ------------------------------------------------------------------
2455 // CompileBroker::collect_statistics
2456 //
2457 // Collect statistics about the compilation.
2458
2459 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2460 bool success = task->is_success();
2461 methodHandle method (thread, task->method());
2462 uint compile_id = task->compile_id();
2463 bool is_osr = (task->osr_bci() != standard_entry_bci);
2464 const int comp_level = task->comp_level();
2465 nmethod* code = task->code();
2466 CompilerCounters* counters = thread->counters();
2467
2468 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2469 MutexLocker locker(CompileStatistics_lock);
2470
2471 // _perf variables are production performance counters which are
2472 // updated regardless of the setting of the CITime and CITimeEach flags
2473 //
2474
2475 // account all time, including bailouts and failures in this counter;
2476 // C1 and C2 counters are counting both successful and unsuccessful compiles
2477 _t_total_compilation.add(time);
2478
2479 if (!success) {
2480 _total_bailout_count++;
2481 if (UsePerfData) {
2482 _perf_last_failed_method->set_value(counters->current_method());
2483 _perf_last_failed_type->set_value(counters->compile_type());
2484 _perf_total_bailout_count->inc();
2485 }
2486 _t_bailedout_compilation.add(time);
2487 } else if (code == NULL) {
2488 if (UsePerfData) {
2489 _perf_last_invalidated_method->set_value(counters->current_method());
2490 _perf_last_invalidated_type->set_value(counters->compile_type());
2491 _perf_total_invalidated_count->inc();
2492 }
2493 _total_invalidated_count++;
2494 _t_invalidated_compilation.add(time);
2495 } else {
2496 // Compilation succeeded
2497
2498 // update compilation ticks - used by the implementation of
2499 // java.lang.management.CompilationMXBean
2500 _perf_total_compilation->inc(time.ticks());
2501 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2502
2503 if (CITime) {
2504 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2505 if (is_osr) {
2506 _t_osr_compilation.add(time);
2507 _sum_osr_bytes_compiled += bytes_compiled;
2508 } else {
2509 _t_standard_compilation.add(time);
2510 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2511 }
2512
2513 // Collect statistic per compilation level
2514 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2515 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2516 if (is_osr) {
2517 stats->_osr.update(time, bytes_compiled);
2518 } else {
2519 stats->_standard.update(time, bytes_compiled);
2520 }
2521 stats->_nmethods_size += code->total_size();
2522 stats->_nmethods_code_size += code->insts_size();
2523 } else {
2524 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2525 }
2526
2527 // Collect statistic per compiler
2528 AbstractCompiler* comp = compiler(comp_level);
2529 if (comp) {
2530 CompilerStatistics* stats = comp->stats();
2531 if (is_osr) {
2532 stats->_osr.update(time, bytes_compiled);
2533 } else {
2534 stats->_standard.update(time, bytes_compiled);
2535 }
2536 stats->_nmethods_size += code->total_size();
2537 stats->_nmethods_code_size += code->insts_size();
2538 } else { // if (!comp)
2539 assert(false, "Compiler object must exist");
2540 }
2541 }
2542
2543 if (UsePerfData) {
2544 // save the name of the last method compiled
2545 _perf_last_method->set_value(counters->current_method());
2546 _perf_last_compile_type->set_value(counters->compile_type());
2547 _perf_last_compile_size->set_value(method->code_size() +
2548 task->num_inlined_bytecodes());
2549 if (is_osr) {
2550 _perf_osr_compilation->inc(time.ticks());
2551 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2552 } else {
2553 _perf_standard_compilation->inc(time.ticks());
2554 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2555 }
2556 }
2557
2558 if (CITimeEach) {
2559 double compile_time = time.seconds();
2560 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2561 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2562 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2563 }
2564
2565 // Collect counts of successful compilations
2566 _sum_nmethod_size += code->total_size();
2567 _sum_nmethod_code_size += code->insts_size();
2568 _total_compile_count++;
2569
2570 if (UsePerfData) {
2571 _perf_sum_nmethod_size->inc( code->total_size());
2572 _perf_sum_nmethod_code_size->inc(code->insts_size());
2573 _perf_total_compile_count->inc();
2574 }
2575
2576 if (is_osr) {
2577 if (UsePerfData) _perf_total_osr_compile_count->inc();
2578 _total_osr_compile_count++;
2579 } else {
2580 if (UsePerfData) _perf_total_standard_compile_count->inc();
2581 _total_standard_compile_count++;
2582 }
2583 }
2584 // set the current method for the thread to null
2585 if (UsePerfData) counters->set_current_method("");
2586 }
2587
2588 const char* CompileBroker::compiler_name(int comp_level) {
2589 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2590 if (comp == NULL) {
2591 return "no compiler";
2592 } else {
2593 return (comp->name());
2594 }
2595 }
2596
2597 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2598 tty->print_cr(" %s {speed: %6.3f bytes/s; standard: %6.3f s, %d bytes, %d methods; osr: %6.3f s, %d bytes, %d methods; nmethods_size: %d bytes; nmethods_code_size: %d bytes}",
2599 name, stats->bytes_per_second(),
2600 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2601 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2602 stats->_nmethods_size, stats->_nmethods_code_size);
2603 }
2604
2605 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2606 if (per_compiler) {
2607 if (aggregate) {
2608 tty->cr();
2609 tty->print_cr("Individual compiler times (for compiled methods only)");
2610 tty->print_cr("------------------------------------------------");
2611 tty->cr();
2612 }
2613 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2614 AbstractCompiler* comp = _compilers[i];
2615 if (comp != NULL) {
2616 print_times(comp->name(), comp->stats());
2617 }
2618 }
2619 if (aggregate) {
2620 tty->cr();
2621 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2622 tty->print_cr("------------------------------------------------");
2623 tty->cr();
2624 }
2625 char tier_name[256];
2626 for (int tier = CompLevel_simple; tier <= CompLevel_highest_tier; tier++) {
2627 CompilerStatistics* stats = &_stats_per_level[tier-1];
2628 sprintf(tier_name, "Tier%d", tier);
2629 print_times(tier_name, stats);
2630 }
2631 }
2632
2633 #if INCLUDE_JVMCI
2634 // In hosted mode, print the JVMCI compiler specific counters manually.
2635 if (EnableJVMCI && !UseJVMCICompiler) {
2636 JVMCICompiler::print_compilation_timers();
2637 }
2638 #endif
2639
2640 if (!aggregate) {
2641 return;
2642 }
2643
2644 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2645 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2646 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2647
2648 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2649 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2650
2651 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2652 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2653 int total_compile_count = CompileBroker::_total_compile_count;
2654 int total_bailout_count = CompileBroker::_total_bailout_count;
2655 int total_invalidated_count = CompileBroker::_total_invalidated_count;
2656
2657 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2658 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2659
2660 tty->cr();
2661 tty->print_cr("Accumulated compiler times");
2662 tty->print_cr("----------------------------------------------------------");
2663 //0000000000111111111122222222223333333333444444444455555555556666666666
2664 //0123456789012345678901234567890123456789012345678901234567890123456789
2665 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2666 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2667 standard_compilation.seconds(),
2668 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2669 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2670 CompileBroker::_t_bailedout_compilation.seconds(),
2671 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2672 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2673 osr_compilation.seconds(),
2674 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2675 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2676 CompileBroker::_t_invalidated_compilation.seconds(),
2677 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2678
2679 AbstractCompiler *comp = compiler(CompLevel_simple);
2680 if (comp != NULL) {
2681 tty->cr();
2682 comp->print_timers();
2683 }
2684 comp = compiler(CompLevel_full_optimization);
2685 if (comp != NULL) {
2686 tty->cr();
2687 comp->print_timers();
2688 }
2689 tty->cr();
2690 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2691 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2692 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2693 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2694 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2695 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2696 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2697 double tcs = total_compilation.seconds();
2698 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2699 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2700 tty->cr();
2701 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2702 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2703 }
2704
2705 // Print general/accumulated JIT information.
2706 void CompileBroker::print_info(outputStream *out) {
2707 if (out == NULL) out = tty;
2708 out->cr();
2709 out->print_cr("======================");
2710 out->print_cr(" General JIT info ");
2711 out->print_cr("======================");
2712 out->cr();
2713 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2714 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2715 out->cr();
2716 out->print_cr("CodeCache overview");
2717 out->print_cr("--------------------------------------------------------");
2718 out->cr();
2719 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2720 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2721 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2722 out->cr();
2723
2724 out->cr();
2725 out->print_cr("CodeCache cleaning overview");
2726 out->print_cr("--------------------------------------------------------");
2727 out->cr();
2728 NMethodSweeper::print(out);
2729 out->print_cr("--------------------------------------------------------");
2730 out->cr();
2731 }
2732
2733 // Note: tty_lock must not be held upon entry to this function.
2734 // Print functions called from herein do "micro-locking" on tty_lock.
2735 // That's a tradeoff which keeps together important blocks of output.
2736 // At the same time, continuous tty_lock hold time is kept in check,
2737 // preventing concurrently printing threads from stalling a long time.
2738 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2739 TimeStamp ts_total;
2740 TimeStamp ts_global;
2741 TimeStamp ts;
2742
2743 bool allFun = !strcmp(function, "all");
2744 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2745 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2746 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2747 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2748 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2749 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2750 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2751 bool discard = !strcmp(function, "discard") || allFun;
2752
2753 if (out == NULL) {
2754 out = tty;
2755 }
2756
2757 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2758 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2759 out->cr();
2760 return;
2761 }
2762
2763 ts_total.update(); // record starting point
2764
2765 if (aggregate) {
2766 print_info(out);
2767 }
2768
2769 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2770 // That prevents another thread from destroying our view on the CodeHeap.
2771 // When we request individual parts of the analysis via the jcmd interface, it is possible
2772 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2773 // updated the aggregated data. That's a tolerable tradeoff because we can't hold a lock
2774 // across user interaction.
2775 // Acquire this lock before acquiring the CodeCache_lock.
2776 // CodeHeapStateAnalytics_lock could be held by a concurrent thread for a long time,
2777 // leading to an unnecessarily long hold time of the CodeCache_lock.
2778 ts.update(); // record starting point
2779 MutexLocker mu1(CodeHeapStateAnalytics_lock, Mutex::_no_safepoint_check_flag);
2780 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2781
2782 // If we serve an "allFun" call, it is beneficial to hold the CodeCache_lock
2783 // for the entire duration of aggregation and printing. That makes sure
2784 // we see a consistent picture and do not run into issues caused by
2785 // the CodeHeap being altered concurrently.
2786 Mutex* global_lock = allFun ? CodeCache_lock : NULL;
2787 Mutex* function_lock = allFun ? NULL : CodeCache_lock;
2788 ts_global.update(); // record starting point
2789 MutexLocker mu2(global_lock, Mutex::_no_safepoint_check_flag);
2790 if (global_lock != NULL) {
2791 out->print_cr("\n__ CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2792 ts_global.update(); // record starting point
2793 }
2794
2795 if (aggregate) {
2796 ts.update(); // record starting point
2797 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2798 if (function_lock != NULL) {
2799 out->print_cr("\n__ CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2800 }
2801
2802 ts.update(); // record starting point
2803 CodeCache::aggregate(out, granularity);
2804 if (function_lock != NULL) {
2805 out->print_cr("\n__ CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2806 }
2807 }
2808
2809 if (usedSpace) CodeCache::print_usedSpace(out);
2810 if (freeSpace) CodeCache::print_freeSpace(out);
2811 if (methodCount) CodeCache::print_count(out);
2812 if (methodSpace) CodeCache::print_space(out);
2813 if (methodAge) CodeCache::print_age(out);
2814 if (methodNames) {
2815 // print_names() has shown to be sensitive to concurrent CodeHeap modifications.
2816 // Therefore, request the CodeCache_lock before calling...
2817 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2818 CodeCache::print_names(out);
2819 }
2820 if (discard) CodeCache::discard(out);
2821
2822 if (global_lock != NULL) {
2823 out->print_cr("\n__ CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2824 }
2825 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2826 }