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 #if defined(ASSERT) && COMPILER2_OR_JVMCI
809 // Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to
810 // the running java application. Configured with vm options DeoptimizeObjectsALot*.
811 class DeoptimizeObjectsALotThread : public JavaThread {
812
813 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS);
814 void deoptimize_objects_alot_loop_single();
815 void deoptimize_objects_alot_loop_all();
816
817 public:
818 DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { }
819
820 bool is_hidden_from_external_view() const { return true; }
821 };
822
823 // Entry for DeoptimizeObjectsALotThread. The threads are started in
824 // CompileBroker::init_compiler_sweeper_threads() iff DeoptimizeObjectsALot is enabled
825 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
826 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
827 bool enter_single_loop;
828 {
829 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
830 static int single_thread_count = 0;
831 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
832 }
833 if (enter_single_loop) {
834 dt->deoptimize_objects_alot_loop_single();
835 } else {
836 dt->deoptimize_objects_alot_loop_all();
837 }
838 }
839
840 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
841 // barrier targets a single thread which is selected round robin.
842 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
843 HandleMark hm(this);
844 while (!this->is_terminated()) {
845 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
846 { // Begin new scope for escape barrier
847 HandleMarkCleaner hmc(this);
848 ResourceMark rm(this);
849 EscapeBarrier eb(this, deoptee_thread, true);
850 eb.deoptimize_objects(100);
851 }
852 // Now sleep after the escape barriers destructor resumed deoptee_thread.
853 sleep(DeoptimizeObjectsALotInterval);
854 }
855 }
856 }
857
858 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
859 // barrier targets all java threads in the vm at once.
860 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
861 HandleMark hm(this);
862 while (!is_terminated()) {
863 { // Begin new scope for escape barrier
864 HandleMarkCleaner hmc(this);
865 ResourceMark rm(this);
866 EscapeBarrier eb(this, true);
867 eb.deoptimize_objects_all_threads();
868 }
869 // Now sleep after the escape barriers destructor resumed the java threads.
870 sleep(DeoptimizeObjectsALotInterval);
871 }
872 }
873 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
874
875
876 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, Thread* THREAD) {
877 JavaThread* new_thread = NULL;
878 {
879 MutexLocker mu(THREAD, Threads_lock);
880 switch (type) {
881 case compiler_t:
882 assert(comp != NULL, "Compiler instance missing.");
883 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
884 CompilerCounters* counters = new CompilerCounters();
885 new_thread = new CompilerThread(queue, counters);
886 }
887 break;
888 case sweeper_t:
889 new_thread = new CodeCacheSweeperThread();
890 break;
891 #if defined(ASSERT) && COMPILER2_OR_JVMCI
892 case deoptimizer_t:
893 new_thread = new DeoptimizeObjectsALotThread();
894 break;
895 #endif // ASSERT
896 default:
897 ShouldNotReachHere();
898 }
899
900 // At this point the new CompilerThread data-races with this startup
901 // thread (which I believe is the primoridal thread and NOT the VM
902 // thread). This means Java bytecodes being executed at startup can
903 // queue compile jobs which will run at whatever default priority the
904 // newly created CompilerThread runs at.
905
906
907 // At this point it may be possible that no osthread was created for the
908 // JavaThread due to lack of memory. We would have to throw an exception
909 // in that case. However, since this must work and we do not allow
910 // exceptions anyway, check and abort if this fails. But first release the
911 // lock.
912
913 if (new_thread != NULL && new_thread->osthread() != NULL) {
914
915 java_lang_Thread::set_thread(JNIHandles::resolve_non_null(thread_handle), new_thread);
916
917 // Note that this only sets the JavaThread _priority field, which by
918 // definition is limited to Java priorities and not OS priorities.
919 // The os-priority is set in the CompilerThread startup code itself
920
921 java_lang_Thread::set_priority(JNIHandles::resolve_non_null(thread_handle), NearMaxPriority);
922
923 // Note that we cannot call os::set_priority because it expects Java
924 // priorities and we are *explicitly* using OS priorities so that it's
925 // possible to set the compiler thread priority higher than any Java
926 // thread.
927
928 int native_prio = CompilerThreadPriority;
929 if (native_prio == -1) {
930 if (UseCriticalCompilerThreadPriority) {
931 native_prio = os::java_to_os_priority[CriticalPriority];
932 } else {
933 native_prio = os::java_to_os_priority[NearMaxPriority];
934 }
935 }
936 os::set_native_priority(new_thread, native_prio);
937
938 java_lang_Thread::set_daemon(JNIHandles::resolve_non_null(thread_handle));
939
940 new_thread->set_threadObj(JNIHandles::resolve_non_null(thread_handle));
941 if (type == compiler_t) {
942 new_thread->as_CompilerThread()->set_compiler(comp);
943 }
944 Threads::add(new_thread);
945 Thread::start(new_thread);
946 }
947 }
948
949 // First release lock before aborting VM.
950 if (new_thread == NULL || new_thread->osthread() == NULL) {
951 if (UseDynamicNumberOfCompilerThreads && type == compiler_t && comp->num_compiler_threads() > 0) {
952 if (new_thread != NULL) {
953 new_thread->smr_delete();
954 }
955 return NULL;
956 }
957 vm_exit_during_initialization("java.lang.OutOfMemoryError",
958 os::native_thread_creation_failed_msg());
959 }
960
961 // Let go of Threads_lock before yielding
962 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
963
964 return new_thread;
965 }
966
967
968 void CompileBroker::init_compiler_sweeper_threads() {
969 NMethodSweeper::set_sweep_threshold_bytes(static_cast<size_t>(SweeperThreshold * ReservedCodeCacheSize / 100.0));
970 log_info(codecache, sweep)("Sweeper threshold: " SIZE_FORMAT " bytes", NMethodSweeper::sweep_threshold_bytes());
971
972 // Ensure any exceptions lead to vm_exit_during_initialization.
973 EXCEPTION_MARK;
974 #if !defined(ZERO)
975 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
976 #endif // !ZERO
977 // Initialize the compilation queue
978 if (_c2_count > 0) {
979 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
980 _c2_compile_queue = new CompileQueue(name);
981 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
982 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
983 }
984 if (_c1_count > 0) {
985 _c1_compile_queue = new CompileQueue("C1 compile queue");
986 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
987 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
988 }
989
990 char name_buffer[256];
991
992 for (int i = 0; i < _c2_count; i++) {
993 jobject thread_handle = NULL;
994 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
995 // for JVMCI compiler which can create further ones on demand.
996 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
997 // Create a name for our thread.
998 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
999 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1000 thread_handle = JNIHandles::make_global(thread_oop);
1001 JVMCI_ONLY(})
1002 _compiler2_objects[i] = thread_handle;
1003 _compiler2_logs[i] = NULL;
1004
1005 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1006 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
1007 assert(ct != NULL, "should have been handled for initial thread");
1008 _compilers[1]->set_num_compiler_threads(i + 1);
1009 if (TraceCompilerThreads) {
1010 ResourceMark rm;
1011 MutexLocker mu(Threads_lock);
1012 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
1013 }
1014 }
1015 }
1016
1017 for (int i = 0; i < _c1_count; i++) {
1018 // Create a name for our thread.
1019 sprintf(name_buffer, "C1 CompilerThread%d", i);
1020 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1021 jobject thread_handle = JNIHandles::make_global(thread_oop);
1022 _compiler1_objects[i] = thread_handle;
1023 _compiler1_logs[i] = NULL;
1024
1025 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1026 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
1027 assert(ct != NULL, "should have been handled for initial thread");
1028 _compilers[0]->set_num_compiler_threads(i + 1);
1029 if (TraceCompilerThreads) {
1030 ResourceMark rm;
1031 MutexLocker mu(Threads_lock);
1032 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
1033 }
1034 }
1035 }
1036
1037 if (UsePerfData) {
1038 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
1039 }
1040
1041 if (MethodFlushing) {
1042 // Initialize the sweeper thread
1043 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK);
1044 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1045 make_thread(sweeper_t, thread_handle, NULL, NULL, THREAD);
1046 }
1047
1048 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1049 if (DeoptimizeObjectsALot) {
1050 // Initialize and start the object deoptimizer threads
1051 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1052 for (int count = 0; count < total_count; count++) {
1053 Handle thread_oop = create_thread_oop("Deoptimize objects a lot single mode", CHECK);
1054 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1055 make_thread(deoptimizer_t, thread_handle, NULL, NULL, THREAD);
1056 }
1057 }
1058 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1059 }
1060
1061 void CompileBroker::possibly_add_compiler_threads(Thread* THREAD) {
1062
1063 julong available_memory = os::available_memory();
1064 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1065 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1066 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1067
1068 // Only do attempt to start additional threads if the lock is free.
1069 if (!CompileThread_lock->try_lock()) return;
1070
1071 if (_c2_compile_queue != NULL) {
1072 int old_c2_count = _compilers[1]->num_compiler_threads();
1073 int new_c2_count = MIN4(_c2_count,
1074 _c2_compile_queue->size() / 2,
1075 (int)(available_memory / (200*M)),
1076 (int)(available_cc_np / (128*K)));
1077
1078 for (int i = old_c2_count; i < new_c2_count; i++) {
1079 #if INCLUDE_JVMCI
1080 if (UseJVMCICompiler) {
1081 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
1082 // objects as their existence is completely hidden from the rest of
1083 // the VM (and those compiler threads can't call Java code to do the
1084 // creation anyway). For JVMCI we have to create new j.l.Thread objects
1085 // as they are visible and we can see unexpected thread lifecycle
1086 // transitions if we bind them to new JavaThreads.
1087 if (!THREAD->can_call_java()) break;
1088 char name_buffer[256];
1089 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
1090 Handle thread_oop;
1091 {
1092 // We have to give up the lock temporarily for the Java calls.
1093 MutexUnlocker mu(CompileThread_lock);
1094 thread_oop = create_thread_oop(name_buffer, THREAD);
1095 }
1096 if (HAS_PENDING_EXCEPTION) {
1097 if (TraceCompilerThreads) {
1098 ResourceMark rm;
1099 tty->print_cr("JVMCI compiler thread creation failed:");
1100 PENDING_EXCEPTION->print();
1101 }
1102 CLEAR_PENDING_EXCEPTION;
1103 break;
1104 }
1105 // Check if another thread has beaten us during the Java calls.
1106 if (_compilers[1]->num_compiler_threads() != i) break;
1107 jobject thread_handle = JNIHandles::make_global(thread_oop);
1108 assert(compiler2_object(i) == NULL, "Old one must be released!");
1109 _compiler2_objects[i] = thread_handle;
1110 }
1111 #endif
1112 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1113 if (ct == NULL) break;
1114 _compilers[1]->set_num_compiler_threads(i + 1);
1115 if (TraceCompilerThreads) {
1116 ResourceMark rm;
1117 MutexLocker mu(Threads_lock);
1118 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
1119 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M));
1120 }
1121 }
1122 }
1123
1124 if (_c1_compile_queue != NULL) {
1125 int old_c1_count = _compilers[0]->num_compiler_threads();
1126 int new_c1_count = MIN4(_c1_count,
1127 _c1_compile_queue->size() / 4,
1128 (int)(available_memory / (100*M)),
1129 (int)(available_cc_p / (128*K)));
1130
1131 for (int i = old_c1_count; i < new_c1_count; i++) {
1132 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1133 if (ct == NULL) break;
1134 _compilers[0]->set_num_compiler_threads(i + 1);
1135 if (TraceCompilerThreads) {
1136 ResourceMark rm;
1137 MutexLocker mu(Threads_lock);
1138 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
1139 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M));
1140 }
1141 }
1142 }
1143
1144 CompileThread_lock->unlock();
1145 }
1146
1147
1148 /**
1149 * Set the methods on the stack as on_stack so that redefine classes doesn't
1150 * reclaim them. This method is executed at a safepoint.
1151 */
1152 void CompileBroker::mark_on_stack() {
1153 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1154 // Since we are at a safepoint, we do not need a lock to access
1155 // the compile queues.
1156 if (_c2_compile_queue != NULL) {
1157 _c2_compile_queue->mark_on_stack();
1158 }
1159 if (_c1_compile_queue != NULL) {
1160 _c1_compile_queue->mark_on_stack();
1161 }
1162 }
1163
1164 // ------------------------------------------------------------------
1165 // CompileBroker::compile_method
1166 //
1167 // Request compilation of a method.
1168 void CompileBroker::compile_method_base(const methodHandle& method,
1169 int osr_bci,
1170 int comp_level,
1171 const methodHandle& hot_method,
1172 int hot_count,
1173 CompileTask::CompileReason compile_reason,
1174 bool blocking,
1175 Thread* thread) {
1176 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1177 assert(method->method_holder()->is_instance_klass(),
1178 "sanity check");
1179 assert(!method->method_holder()->is_not_initialized(),
1180 "method holder must be initialized");
1181 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1182
1183 if (CIPrintRequests) {
1184 tty->print("request: ");
1185 method->print_short_name(tty);
1186 if (osr_bci != InvocationEntryBci) {
1187 tty->print(" osr_bci: %d", osr_bci);
1188 }
1189 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1190 if (!hot_method.is_null()) {
1191 tty->print(" hot: ");
1192 if (hot_method() != method()) {
1193 hot_method->print_short_name(tty);
1194 } else {
1195 tty->print("yes");
1196 }
1197 }
1198 tty->cr();
1199 }
1200
1201 // A request has been made for compilation. Before we do any
1202 // real work, check to see if the method has been compiled
1203 // in the meantime with a definitive result.
1204 if (compilation_is_complete(method, osr_bci, comp_level)) {
1205 return;
1206 }
1207
1208 #ifndef PRODUCT
1209 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1210 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1211 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1212 return;
1213 }
1214 }
1215 #endif
1216
1217 // If this method is already in the compile queue, then
1218 // we do not block the current thread.
1219 if (compilation_is_in_queue(method)) {
1220 // We may want to decay our counter a bit here to prevent
1221 // multiple denied requests for compilation. This is an
1222 // open compilation policy issue. Note: The other possibility,
1223 // in the case that this is a blocking compile request, is to have
1224 // all subsequent blocking requesters wait for completion of
1225 // ongoing compiles. Note that in this case we'll need a protocol
1226 // for freeing the associated compile tasks. [Or we could have
1227 // a single static monitor on which all these waiters sleep.]
1228 return;
1229 }
1230
1231 if (TieredCompilation) {
1232 // Tiered policy requires MethodCounters to exist before adding a method to
1233 // the queue. Create if we don't have them yet.
1234 method->get_method_counters(thread);
1235 }
1236
1237 // Outputs from the following MutexLocker block:
1238 CompileTask* task = NULL;
1239 CompileQueue* queue = compile_queue(comp_level);
1240
1241 // Acquire our lock.
1242 {
1243 MutexLocker locker(thread, MethodCompileQueue_lock);
1244
1245 // Make sure the method has not slipped into the queues since
1246 // last we checked; note that those checks were "fast bail-outs".
1247 // Here we need to be more careful, see 14012000 below.
1248 if (compilation_is_in_queue(method)) {
1249 return;
1250 }
1251
1252 // We need to check again to see if the compilation has
1253 // completed. A previous compilation may have registered
1254 // some result.
1255 if (compilation_is_complete(method, osr_bci, comp_level)) {
1256 return;
1257 }
1258
1259 // We now know that this compilation is not pending, complete,
1260 // or prohibited. Assign a compile_id to this compilation
1261 // and check to see if it is in our [Start..Stop) range.
1262 int compile_id = assign_compile_id(method, osr_bci);
1263 if (compile_id == 0) {
1264 // The compilation falls outside the allowed range.
1265 return;
1266 }
1267
1268 #if INCLUDE_JVMCI
1269 if (UseJVMCICompiler && blocking) {
1270 // Don't allow blocking compiles for requests triggered by JVMCI.
1271 if (thread->is_Compiler_thread()) {
1272 blocking = false;
1273 }
1274
1275 if (!UseJVMCINativeLibrary) {
1276 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1277 vframeStream vfst((JavaThread*) thread);
1278 for (; !vfst.at_end(); vfst.next()) {
1279 if (vfst.method()->is_static_initializer() ||
1280 (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) &&
1281 vfst.method()->name() == vmSymbols::loadClass_name())) {
1282 blocking = false;
1283 break;
1284 }
1285 }
1286 }
1287
1288 // Don't allow blocking compilation requests to JVMCI
1289 // if JVMCI itself is not yet initialized
1290 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1291 blocking = false;
1292 }
1293
1294 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1295 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1296 // such as the DestroyJavaVM thread.
1297 if (JVMCI::in_shutdown()) {
1298 blocking = false;
1299 }
1300 }
1301 #endif // INCLUDE_JVMCI
1302
1303 // We will enter the compilation in the queue.
1304 // 14012000: Note that this sets the queued_for_compile bits in
1305 // the target method. We can now reason that a method cannot be
1306 // queued for compilation more than once, as follows:
1307 // Before a thread queues a task for compilation, it first acquires
1308 // the compile queue lock, then checks if the method's queued bits
1309 // are set or it has already been compiled. Thus there can not be two
1310 // instances of a compilation task for the same method on the
1311 // compilation queue. Consider now the case where the compilation
1312 // thread has already removed a task for that method from the queue
1313 // and is in the midst of compiling it. In this case, the
1314 // queued_for_compile bits must be set in the method (and these
1315 // will be visible to the current thread, since the bits were set
1316 // under protection of the compile queue lock, which we hold now.
1317 // When the compilation completes, the compiler thread first sets
1318 // the compilation result and then clears the queued_for_compile
1319 // bits. Neither of these actions are protected by a barrier (or done
1320 // under the protection of a lock), so the only guarantee we have
1321 // (on machines with TSO (Total Store Order)) is that these values
1322 // will update in that order. As a result, the only combinations of
1323 // these bits that the current thread will see are, in temporal order:
1324 // <RESULT, QUEUE> :
1325 // <0, 1> : in compile queue, but not yet compiled
1326 // <1, 1> : compiled but queue bit not cleared
1327 // <1, 0> : compiled and queue bit cleared
1328 // Because we first check the queue bits then check the result bits,
1329 // we are assured that we cannot introduce a duplicate task.
1330 // Note that if we did the tests in the reverse order (i.e. check
1331 // result then check queued bit), we could get the result bit before
1332 // the compilation completed, and the queue bit after the compilation
1333 // completed, and end up introducing a "duplicate" (redundant) task.
1334 // In that case, the compiler thread should first check if a method
1335 // has already been compiled before trying to compile it.
1336 // NOTE: in the event that there are multiple compiler threads and
1337 // there is de-optimization/recompilation, things will get hairy,
1338 // and in that case it's best to protect both the testing (here) of
1339 // these bits, and their updating (here and elsewhere) under a
1340 // common lock.
1341 task = create_compile_task(queue,
1342 compile_id, method,
1343 osr_bci, comp_level,
1344 hot_method, hot_count, compile_reason,
1345 blocking);
1346 }
1347
1348 if (blocking) {
1349 wait_for_completion(task);
1350 }
1351 }
1352
1353 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1354 int comp_level,
1355 const methodHandle& hot_method, int hot_count,
1356 CompileTask::CompileReason compile_reason,
1357 Thread* THREAD) {
1358 // Do nothing if compilebroker is not initalized or compiles are submitted on level none
1359 if (!_initialized || comp_level == CompLevel_none) {
1360 return NULL;
1361 }
1362
1363 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1364 assert(comp != NULL, "Ensure we have a compiler");
1365
1366 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1367 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1368 DirectivesStack::release(directive);
1369 return nm;
1370 }
1371
1372 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1373 int comp_level,
1374 const methodHandle& hot_method, int hot_count,
1375 CompileTask::CompileReason compile_reason,
1376 DirectiveSet* directive,
1377 Thread* THREAD) {
1378
1379 // make sure arguments make sense
1380 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1381 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1382 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1383 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1384 assert(!TieredCompilation || comp_level <= TieredStopAtLevel, "Invalid compilation level");
1385 // allow any levels for WhiteBox
1386 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1387 // return quickly if possible
1388
1389 // lock, make sure that the compilation
1390 // isn't prohibited in a straightforward way.
1391 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1392 if (comp == NULL || !comp->can_compile_method(method) ||
1393 compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1394 return NULL;
1395 }
1396
1397 #if INCLUDE_JVMCI
1398 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1399 return NULL;
1400 }
1401 #endif
1402
1403 if (osr_bci == InvocationEntryBci) {
1404 // standard compilation
1405 CompiledMethod* method_code = method->code();
1406 if (method_code != NULL && method_code->is_nmethod()) {
1407 if (compilation_is_complete(method, osr_bci, comp_level)) {
1408 return (nmethod*) method_code;
1409 }
1410 }
1411 if (method->is_not_compilable(comp_level)) {
1412 return NULL;
1413 }
1414 } else {
1415 // osr compilation
1416 #ifndef TIERED
1417 // seems like an assert of dubious value
1418 assert(comp_level == CompLevel_highest_tier,
1419 "all OSR compiles are assumed to be at a single compilation level");
1420 #endif // TIERED
1421 // We accept a higher level osr method
1422 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1423 if (nm != NULL) return nm;
1424 if (method->is_not_osr_compilable(comp_level)) return NULL;
1425 }
1426
1427 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1428 // some prerequisites that are compiler specific
1429 if (comp->is_c2()) {
1430 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1431 // Resolve all classes seen in the signature of the method
1432 // we are compiling.
1433 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1434 }
1435
1436 // If the method is native, do the lookup in the thread requesting
1437 // the compilation. Native lookups can load code, which is not
1438 // permitted during compilation.
1439 //
1440 // Note: A native method implies non-osr compilation which is
1441 // checked with an assertion at the entry of this method.
1442 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1443 bool in_base_library;
1444 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1445 if (HAS_PENDING_EXCEPTION) {
1446 // In case of an exception looking up the method, we just forget
1447 // about it. The interpreter will kick-in and throw the exception.
1448 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1449 CLEAR_PENDING_EXCEPTION;
1450 return NULL;
1451 }
1452 assert(method->has_native_function(), "must have native code by now");
1453 }
1454
1455 // RedefineClasses() has replaced this method; just return
1456 if (method->is_old()) {
1457 return NULL;
1458 }
1459
1460 // JVMTI -- post_compile_event requires jmethod_id() that may require
1461 // a lock the compiling thread can not acquire. Prefetch it here.
1462 if (JvmtiExport::should_post_compiled_method_load()) {
1463 method->jmethod_id();
1464 }
1465
1466 // do the compilation
1467 if (method->is_native()) {
1468 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1469 #if defined(X86) && !defined(ZERO)
1470 // The following native methods:
1471 //
1472 // java.lang.Float.intBitsToFloat
1473 // java.lang.Float.floatToRawIntBits
1474 // java.lang.Double.longBitsToDouble
1475 // java.lang.Double.doubleToRawLongBits
1476 //
1477 // are called through the interpreter even if interpreter native stubs
1478 // are not preferred (i.e., calling through adapter handlers is preferred).
1479 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1480 // if the version of the methods from the native libraries is called.
1481 // As the interpreter and the C2-intrinsified version of the methods preserves
1482 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1483 if ((UseSSE >= 1 &&
1484 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1485 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1486 (UseSSE >= 2 &&
1487 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1488 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1489 return NULL;
1490 }
1491 #endif // X86 && !ZERO
1492
1493 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1494 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1495 //
1496 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1497 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1498 AdapterHandlerLibrary::create_native_wrapper(method);
1499 } else {
1500 return NULL;
1501 }
1502 } else {
1503 // If the compiler is shut off due to code cache getting full
1504 // fail out now so blocking compiles dont hang the java thread
1505 if (!should_compile_new_jobs()) {
1506 CompilationPolicy::policy()->delay_compilation(method());
1507 return NULL;
1508 }
1509 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1510 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1511 }
1512
1513 // return requested nmethod
1514 // We accept a higher level osr method
1515 if (osr_bci == InvocationEntryBci) {
1516 CompiledMethod* code = method->code();
1517 if (code == NULL) {
1518 return (nmethod*) code;
1519 } else {
1520 return code->as_nmethod_or_null();
1521 }
1522 }
1523 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1524 }
1525
1526
1527 // ------------------------------------------------------------------
1528 // CompileBroker::compilation_is_complete
1529 //
1530 // See if compilation of this method is already complete.
1531 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1532 int osr_bci,
1533 int comp_level) {
1534 bool is_osr = (osr_bci != standard_entry_bci);
1535 if (is_osr) {
1536 if (method->is_not_osr_compilable(comp_level)) {
1537 return true;
1538 } else {
1539 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1540 return (result != NULL);
1541 }
1542 } else {
1543 if (method->is_not_compilable(comp_level)) {
1544 return true;
1545 } else {
1546 CompiledMethod* result = method->code();
1547 if (result == NULL) return false;
1548 return comp_level == result->comp_level();
1549 }
1550 }
1551 }
1552
1553
1554 /**
1555 * See if this compilation is already requested.
1556 *
1557 * Implementation note: there is only a single "is in queue" bit
1558 * for each method. This means that the check below is overly
1559 * conservative in the sense that an osr compilation in the queue
1560 * will block a normal compilation from entering the queue (and vice
1561 * versa). This can be remedied by a full queue search to disambiguate
1562 * cases. If it is deemed profitable, this may be done.
1563 */
1564 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1565 return method->queued_for_compilation();
1566 }
1567
1568 // ------------------------------------------------------------------
1569 // CompileBroker::compilation_is_prohibited
1570 //
1571 // See if this compilation is not allowed.
1572 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1573 bool is_native = method->is_native();
1574 // Some compilers may not support the compilation of natives.
1575 AbstractCompiler *comp = compiler(comp_level);
1576 if (is_native &&
1577 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1578 method->set_not_compilable_quietly("native methods not supported", comp_level);
1579 return true;
1580 }
1581
1582 bool is_osr = (osr_bci != standard_entry_bci);
1583 // Some compilers may not support on stack replacement.
1584 if (is_osr &&
1585 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1586 method->set_not_osr_compilable("OSR not supported", comp_level);
1587 return true;
1588 }
1589
1590 // The method may be explicitly excluded by the user.
1591 double scale;
1592 if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1593 bool quietly = CompilerOracle::should_exclude_quietly();
1594 if (PrintCompilation && !quietly) {
1595 // This does not happen quietly...
1596 ResourceMark rm;
1597 tty->print("### Excluding %s:%s",
1598 method->is_native() ? "generation of native wrapper" : "compile",
1599 (method->is_static() ? " static" : ""));
1600 method->print_short_name(tty);
1601 tty->cr();
1602 }
1603 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1604 }
1605
1606 return false;
1607 }
1608
1609 /**
1610 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1611 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1612 * The function also allows to generate separate compilation IDs for OSR compilations.
1613 */
1614 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1615 #ifdef ASSERT
1616 bool is_osr = (osr_bci != standard_entry_bci);
1617 int id;
1618 if (method->is_native()) {
1619 assert(!is_osr, "can't be osr");
1620 // Adapters, native wrappers and method handle intrinsics
1621 // should be generated always.
1622 return Atomic::add(&_compilation_id, 1);
1623 } else if (CICountOSR && is_osr) {
1624 id = Atomic::add(&_osr_compilation_id, 1);
1625 if (CIStartOSR <= id && id < CIStopOSR) {
1626 return id;
1627 }
1628 } else {
1629 id = Atomic::add(&_compilation_id, 1);
1630 if (CIStart <= id && id < CIStop) {
1631 return id;
1632 }
1633 }
1634
1635 // Method was not in the appropriate compilation range.
1636 method->set_not_compilable_quietly("Not in requested compile id range");
1637 return 0;
1638 #else
1639 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1640 // only _compilation_id is incremented.
1641 return Atomic::add(&_compilation_id, 1);
1642 #endif
1643 }
1644
1645 // ------------------------------------------------------------------
1646 // CompileBroker::assign_compile_id_unlocked
1647 //
1648 // Public wrapper for assign_compile_id that acquires the needed locks
1649 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1650 MutexLocker locker(thread, MethodCompileQueue_lock);
1651 return assign_compile_id(method, osr_bci);
1652 }
1653
1654 // ------------------------------------------------------------------
1655 // CompileBroker::create_compile_task
1656 //
1657 // Create a CompileTask object representing the current request for
1658 // compilation. Add this task to the queue.
1659 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1660 int compile_id,
1661 const methodHandle& method,
1662 int osr_bci,
1663 int comp_level,
1664 const methodHandle& hot_method,
1665 int hot_count,
1666 CompileTask::CompileReason compile_reason,
1667 bool blocking) {
1668 CompileTask* new_task = CompileTask::allocate();
1669 new_task->initialize(compile_id, method, osr_bci, comp_level,
1670 hot_method, hot_count, compile_reason,
1671 blocking);
1672 queue->add(new_task);
1673 return new_task;
1674 }
1675
1676 #if INCLUDE_JVMCI
1677 // The number of milliseconds to wait before checking if
1678 // JVMCI compilation has made progress.
1679 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1680
1681 // The number of JVMCI compilation progress checks that must fail
1682 // before unblocking a thread waiting for a blocking compilation.
1683 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1684
1685 /**
1686 * Waits for a JVMCI compiler to complete a given task. This thread
1687 * waits until either the task completes or it sees no JVMCI compilation
1688 * progress for N consecutive milliseconds where N is
1689 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1690 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1691 *
1692 * @return true if this thread needs to free/recycle the task
1693 */
1694 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1695 assert(UseJVMCICompiler, "sanity");
1696 MonitorLocker ml(thread, task->lock());
1697 int progress_wait_attempts = 0;
1698 int methods_compiled = jvmci->methods_compiled();
1699 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1700 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1701 CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread();
1702
1703 bool progress;
1704 if (jvmci_compiler_thread != NULL) {
1705 // If the JVMCI compiler thread is not blocked or suspended, we deem it to be making progress.
1706 progress = jvmci_compiler_thread->thread_state() != _thread_blocked &&
1707 !jvmci_compiler_thread->is_external_suspend();
1708 } else {
1709 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1710 // that all JVMCI compiler threads are blocked on. We use the counter for
1711 // successful JVMCI compilations to determine whether JVMCI compilation
1712 // is still making progress through the JVMCI compiler queue.
1713 progress = jvmci->methods_compiled() != methods_compiled;
1714 }
1715
1716 if (!progress) {
1717 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1718 if (PrintCompilation) {
1719 task->print(tty, "wait for blocking compilation timed out");
1720 }
1721 break;
1722 }
1723 } else {
1724 progress_wait_attempts = 0;
1725 if (jvmci_compiler_thread == NULL) {
1726 methods_compiled = jvmci->methods_compiled();
1727 }
1728 }
1729 }
1730 task->clear_waiter();
1731 return task->is_complete();
1732 }
1733 #endif
1734
1735 /**
1736 * Wait for the compilation task to complete.
1737 */
1738 void CompileBroker::wait_for_completion(CompileTask* task) {
1739 if (CIPrintCompileQueue) {
1740 ttyLocker ttyl;
1741 tty->print_cr("BLOCKING FOR COMPILE");
1742 }
1743
1744 assert(task->is_blocking(), "can only wait on blocking task");
1745
1746 JavaThread* thread = JavaThread::current();
1747
1748 methodHandle method(thread, task->method());
1749 bool free_task;
1750 #if INCLUDE_JVMCI
1751 AbstractCompiler* comp = compiler(task->comp_level());
1752 if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
1753 // It may return before compilation is completed.
1754 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1755 } else
1756 #endif
1757 {
1758 MonitorLocker ml(thread, task->lock());
1759 free_task = true;
1760 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1761 ml.wait();
1762 }
1763 }
1764
1765 if (free_task) {
1766 if (is_compilation_disabled_forever()) {
1767 CompileTask::free(task);
1768 return;
1769 }
1770
1771 // It is harmless to check this status without the lock, because
1772 // completion is a stable property (until the task object is recycled).
1773 assert(task->is_complete(), "Compilation should have completed");
1774 assert(task->code_handle() == NULL, "must be reset");
1775
1776 // By convention, the waiter is responsible for recycling a
1777 // blocking CompileTask. Since there is only one waiter ever
1778 // waiting on a CompileTask, we know that no one else will
1779 // be using this CompileTask; we can free it.
1780 CompileTask::free(task);
1781 }
1782 }
1783
1784 /**
1785 * Initialize compiler thread(s) + compiler object(s). The postcondition
1786 * of this function is that the compiler runtimes are initialized and that
1787 * compiler threads can start compiling.
1788 */
1789 bool CompileBroker::init_compiler_runtime() {
1790 CompilerThread* thread = CompilerThread::current();
1791 AbstractCompiler* comp = thread->compiler();
1792 // Final sanity check - the compiler object must exist
1793 guarantee(comp != NULL, "Compiler object must exist");
1794
1795 {
1796 // Must switch to native to allocate ci_env
1797 ThreadToNativeFromVM ttn(thread);
1798 ciEnv ci_env((CompileTask*)NULL);
1799 // Cache Jvmti state
1800 ci_env.cache_jvmti_state();
1801 // Cache DTrace flags
1802 ci_env.cache_dtrace_flags();
1803
1804 // Switch back to VM state to do compiler initialization
1805 ThreadInVMfromNative tv(thread);
1806 ResetNoHandleMark rnhm;
1807
1808 // Perform per-thread and global initializations
1809 comp->initialize();
1810 }
1811
1812 if (comp->is_failed()) {
1813 disable_compilation_forever();
1814 // If compiler initialization failed, no compiler thread that is specific to a
1815 // particular compiler runtime will ever start to compile methods.
1816 shutdown_compiler_runtime(comp, thread);
1817 return false;
1818 }
1819
1820 // C1 specific check
1821 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1822 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1823 return false;
1824 }
1825
1826 return true;
1827 }
1828
1829 /**
1830 * If C1 and/or C2 initialization failed, we shut down all compilation.
1831 * We do this to keep things simple. This can be changed if it ever turns
1832 * out to be a problem.
1833 */
1834 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1835 // Free buffer blob, if allocated
1836 if (thread->get_buffer_blob() != NULL) {
1837 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1838 CodeCache::free(thread->get_buffer_blob());
1839 }
1840
1841 if (comp->should_perform_shutdown()) {
1842 // There are two reasons for shutting down the compiler
1843 // 1) compiler runtime initialization failed
1844 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1845 warning("%s initialization failed. Shutting down all compilers", comp->name());
1846
1847 // Only one thread per compiler runtime object enters here
1848 // Set state to shut down
1849 comp->set_shut_down();
1850
1851 // Delete all queued compilation tasks to make compiler threads exit faster.
1852 if (_c1_compile_queue != NULL) {
1853 _c1_compile_queue->free_all();
1854 }
1855
1856 if (_c2_compile_queue != NULL) {
1857 _c2_compile_queue->free_all();
1858 }
1859
1860 // Set flags so that we continue execution with using interpreter only.
1861 UseCompiler = false;
1862 UseInterpreter = true;
1863
1864 // We could delete compiler runtimes also. However, there are references to
1865 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1866 // fail. This can be done later if necessary.
1867 }
1868 }
1869
1870 /**
1871 * Helper function to create new or reuse old CompileLog.
1872 */
1873 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1874 if (!LogCompilation) return NULL;
1875
1876 AbstractCompiler *compiler = ct->compiler();
1877 bool c1 = compiler->is_c1();
1878 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1879 assert(compiler_objects != NULL, "must be initialized at this point");
1880 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1881 assert(logs != NULL, "must be initialized at this point");
1882 int count = c1 ? _c1_count : _c2_count;
1883
1884 // Find Compiler number by its threadObj.
1885 oop compiler_obj = ct->threadObj();
1886 int compiler_number = 0;
1887 bool found = false;
1888 for (; compiler_number < count; compiler_number++) {
1889 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1890 found = true;
1891 break;
1892 }
1893 }
1894 assert(found, "Compiler must exist at this point");
1895
1896 // Determine pointer for this thread's log.
1897 CompileLog** log_ptr = &logs[compiler_number];
1898
1899 // Return old one if it exists.
1900 CompileLog* log = *log_ptr;
1901 if (log != NULL) {
1902 ct->init_log(log);
1903 return log;
1904 }
1905
1906 // Create a new one and remember it.
1907 init_compiler_thread_log();
1908 log = ct->log();
1909 *log_ptr = log;
1910 return log;
1911 }
1912
1913 // ------------------------------------------------------------------
1914 // CompileBroker::compiler_thread_loop
1915 //
1916 // The main loop run by a CompilerThread.
1917 void CompileBroker::compiler_thread_loop() {
1918 CompilerThread* thread = CompilerThread::current();
1919 CompileQueue* queue = thread->queue();
1920 // For the thread that initializes the ciObjectFactory
1921 // this resource mark holds all the shared objects
1922 ResourceMark rm;
1923
1924 // First thread to get here will initialize the compiler interface
1925
1926 {
1927 ASSERT_IN_VM;
1928 MutexLocker only_one (thread, CompileThread_lock);
1929 if (!ciObjectFactory::is_initialized()) {
1930 ciObjectFactory::initialize();
1931 }
1932 }
1933
1934 // Open a log.
1935 CompileLog* log = get_log(thread);
1936 if (log != NULL) {
1937 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1938 thread->name(),
1939 os::current_thread_id(),
1940 os::current_process_id());
1941 log->stamp();
1942 log->end_elem();
1943 }
1944
1945 // If compiler thread/runtime initialization fails, exit the compiler thread
1946 if (!init_compiler_runtime()) {
1947 return;
1948 }
1949
1950 thread->start_idle_timer();
1951
1952 // Poll for new compilation tasks as long as the JVM runs. Compilation
1953 // should only be disabled if something went wrong while initializing the
1954 // compiler runtimes. This, in turn, should not happen. The only known case
1955 // when compiler runtime initialization fails is if there is not enough free
1956 // space in the code cache to generate the necessary stubs, etc.
1957 while (!is_compilation_disabled_forever()) {
1958 // We need this HandleMark to avoid leaking VM handles.
1959 HandleMark hm(thread);
1960
1961 CompileTask* task = queue->get();
1962 if (task == NULL) {
1963 if (UseDynamicNumberOfCompilerThreads) {
1964 // Access compiler_count under lock to enforce consistency.
1965 MutexLocker only_one(CompileThread_lock);
1966 if (can_remove(thread, true)) {
1967 if (TraceCompilerThreads) {
1968 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1969 thread->name(), thread->idle_time_millis());
1970 }
1971 // Free buffer blob, if allocated
1972 if (thread->get_buffer_blob() != NULL) {
1973 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1974 CodeCache::free(thread->get_buffer_blob());
1975 }
1976 return; // Stop this thread.
1977 }
1978 }
1979 } else {
1980 // Assign the task to the current thread. Mark this compilation
1981 // thread as active for the profiler.
1982 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1983 // occurs after fetching the compile task off the queue.
1984 CompileTaskWrapper ctw(task);
1985 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1986 task->set_code_handle(&result_handle);
1987 methodHandle method(thread, task->method());
1988
1989 // Never compile a method if breakpoints are present in it
1990 if (method()->number_of_breakpoints() == 0) {
1991 // Compile the method.
1992 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1993 invoke_compiler_on_method(task);
1994 thread->start_idle_timer();
1995 } else {
1996 // After compilation is disabled, remove remaining methods from queue
1997 method->clear_queued_for_compilation();
1998 task->set_failure_reason("compilation is disabled");
1999 }
2000 }
2001
2002 if (UseDynamicNumberOfCompilerThreads) {
2003 possibly_add_compiler_threads(thread);
2004 assert(!thread->has_pending_exception(), "should have been handled");
2005 }
2006 }
2007 }
2008
2009 // Shut down compiler runtime
2010 shutdown_compiler_runtime(thread->compiler(), thread);
2011 }
2012
2013 // ------------------------------------------------------------------
2014 // CompileBroker::init_compiler_thread_log
2015 //
2016 // Set up state required by +LogCompilation.
2017 void CompileBroker::init_compiler_thread_log() {
2018 CompilerThread* thread = CompilerThread::current();
2019 char file_name[4*K];
2020 FILE* fp = NULL;
2021 intx thread_id = os::current_thread_id();
2022 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
2023 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
2024 if (dir == NULL) {
2025 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
2026 thread_id, os::current_process_id());
2027 } else {
2028 jio_snprintf(file_name, sizeof(file_name),
2029 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
2030 os::file_separator(), thread_id, os::current_process_id());
2031 }
2032
2033 fp = fopen(file_name, "wt");
2034 if (fp != NULL) {
2035 if (LogCompilation && Verbose) {
2036 tty->print_cr("Opening compilation log %s", file_name);
2037 }
2038 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
2039 if (log == NULL) {
2040 fclose(fp);
2041 return;
2042 }
2043 thread->init_log(log);
2044
2045 if (xtty != NULL) {
2046 ttyLocker ttyl;
2047 // Record any per thread log files
2048 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2049 }
2050 return;
2051 }
2052 }
2053 warning("Cannot open log file: %s", file_name);
2054 }
2055
2056 void CompileBroker::log_metaspace_failure() {
2057 const char* message = "some methods may not be compiled because metaspace "
2058 "is out of memory";
2059 if (_compilation_log != NULL) {
2060 _compilation_log->log_metaspace_failure(message);
2061 }
2062 if (PrintCompilation) {
2063 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2064 }
2065 }
2066
2067
2068 // ------------------------------------------------------------------
2069 // CompileBroker::set_should_block
2070 //
2071 // Set _should_block.
2072 // Call this from the VM, with Threads_lock held and a safepoint requested.
2073 void CompileBroker::set_should_block() {
2074 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2075 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2076 #ifndef PRODUCT
2077 if (PrintCompilation && (Verbose || WizardMode))
2078 tty->print_cr("notifying compiler thread pool to block");
2079 #endif
2080 _should_block = true;
2081 }
2082
2083 // ------------------------------------------------------------------
2084 // CompileBroker::maybe_block
2085 //
2086 // Call this from the compiler at convenient points, to poll for _should_block.
2087 void CompileBroker::maybe_block() {
2088 if (_should_block) {
2089 #ifndef PRODUCT
2090 if (PrintCompilation && (Verbose || WizardMode))
2091 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2092 #endif
2093 ThreadInVMfromNative tivfn(JavaThread::current());
2094 }
2095 }
2096
2097 // wrapper for CodeCache::print_summary()
2098 static void codecache_print(bool detailed)
2099 {
2100 ResourceMark rm;
2101 stringStream s;
2102 // Dump code cache into a buffer before locking the tty,
2103 {
2104 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2105 CodeCache::print_summary(&s, detailed);
2106 }
2107 ttyLocker ttyl;
2108 tty->print("%s", s.as_string());
2109 }
2110
2111 // wrapper for CodeCache::print_summary() using outputStream
2112 static void codecache_print(outputStream* out, bool detailed) {
2113 ResourceMark rm;
2114 stringStream s;
2115
2116 // Dump code cache into a buffer
2117 {
2118 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2119 CodeCache::print_summary(&s, detailed);
2120 }
2121
2122 char* remaining_log = s.as_string();
2123 while (*remaining_log != '\0') {
2124 char* eol = strchr(remaining_log, '\n');
2125 if (eol == NULL) {
2126 out->print_cr("%s", remaining_log);
2127 remaining_log = remaining_log + strlen(remaining_log);
2128 } else {
2129 *eol = '\0';
2130 out->print_cr("%s", remaining_log);
2131 remaining_log = eol + 1;
2132 }
2133 }
2134 }
2135
2136 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env,
2137 int compilable, const char* failure_reason) {
2138 if (success) {
2139 task->mark_success();
2140 if (ci_env != NULL) {
2141 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
2142 }
2143 if (_compilation_log != NULL) {
2144 nmethod* code = task->code();
2145 if (code != NULL) {
2146 _compilation_log->log_nmethod(thread, code);
2147 }
2148 }
2149 } else if (AbortVMOnCompilationFailure) {
2150 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2151 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2152 }
2153 if (compilable == ciEnv::MethodCompilable_never) {
2154 fatal("Never compilable: %s", failure_reason);
2155 }
2156 }
2157 // simulate crash during compilation
2158 assert(task->compile_id() != CICrashAt, "just as planned");
2159 }
2160
2161 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2162 assert(task != NULL, "invariant");
2163 CompilerEvent::CompilationEvent::post(event,
2164 task->compile_id(),
2165 task->compiler()->type(),
2166 task->method(),
2167 task->comp_level(),
2168 task->is_success(),
2169 task->osr_bci() != CompileBroker::standard_entry_bci,
2170 (task->code() == NULL) ? 0 : task->code()->total_size(),
2171 task->num_inlined_bytecodes());
2172 }
2173
2174 int DirectivesStack::_depth = 0;
2175 CompilerDirectives* DirectivesStack::_top = NULL;
2176 CompilerDirectives* DirectivesStack::_bottom = NULL;
2177
2178 // ------------------------------------------------------------------
2179 // CompileBroker::invoke_compiler_on_method
2180 //
2181 // Compile a method.
2182 //
2183 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2184 task->print_ul();
2185 if (PrintCompilation) {
2186 ResourceMark rm;
2187 task->print_tty();
2188 }
2189 elapsedTimer time;
2190
2191 CompilerThread* thread = CompilerThread::current();
2192 ResourceMark rm(thread);
2193
2194 if (LogEvents) {
2195 _compilation_log->log_compile(thread, task);
2196 }
2197
2198 // Common flags.
2199 uint compile_id = task->compile_id();
2200 int osr_bci = task->osr_bci();
2201 bool is_osr = (osr_bci != standard_entry_bci);
2202 bool should_log = (thread->log() != NULL);
2203 bool should_break = false;
2204 const int task_level = task->comp_level();
2205 AbstractCompiler* comp = task->compiler();
2206
2207 DirectiveSet* directive;
2208 {
2209 // create the handle inside it's own block so it can't
2210 // accidentally be referenced once the thread transitions to
2211 // native. The NoHandleMark before the transition should catch
2212 // any cases where this occurs in the future.
2213 methodHandle method(thread, task->method());
2214 assert(!method->is_native(), "no longer compile natives");
2215
2216 // Look up matching directives
2217 directive = DirectivesStack::getMatchingDirective(method, comp);
2218
2219 // Update compile information when using perfdata.
2220 if (UsePerfData) {
2221 update_compile_perf_data(thread, method, is_osr);
2222 }
2223
2224 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2225 }
2226
2227 should_break = directive->BreakAtExecuteOption || task->check_break_at_flags();
2228 if (should_log && !directive->LogOption) {
2229 should_log = false;
2230 }
2231
2232 // Allocate a new set of JNI handles.
2233 push_jni_handle_block();
2234 Method* target_handle = task->method();
2235 int compilable = ciEnv::MethodCompilable;
2236 const char* failure_reason = NULL;
2237 bool failure_reason_on_C_heap = false;
2238 const char* retry_message = NULL;
2239
2240 #if INCLUDE_JVMCI
2241 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2242 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2243
2244 TraceTime t1("compilation", &time);
2245 EventCompilation event;
2246 JVMCICompileState compile_state(task);
2247 JVMCIRuntime *runtime = NULL;
2248
2249 if (JVMCI::in_shutdown()) {
2250 failure_reason = "in JVMCI shutdown";
2251 retry_message = "not retryable";
2252 compilable = ciEnv::MethodCompilable_never;
2253 } else if (compile_state.target_method_is_old()) {
2254 // Skip redefined methods
2255 failure_reason = "redefined method";
2256 retry_message = "not retryable";
2257 compilable = ciEnv::MethodCompilable_never;
2258 } else {
2259 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2260 methodHandle method(thread, target_handle);
2261 runtime = env.runtime();
2262 runtime->compile_method(&env, jvmci, method, osr_bci);
2263
2264 failure_reason = compile_state.failure_reason();
2265 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2266 if (!compile_state.retryable()) {
2267 retry_message = "not retryable";
2268 compilable = ciEnv::MethodCompilable_not_at_tier;
2269 }
2270 if (task->code() == NULL) {
2271 assert(failure_reason != NULL, "must specify failure_reason");
2272 }
2273 }
2274 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason);
2275 if (event.should_commit()) {
2276 post_compilation_event(event, task);
2277 }
2278
2279 } else
2280 #endif // INCLUDE_JVMCI
2281 {
2282 NoHandleMark nhm;
2283 ThreadToNativeFromVM ttn(thread);
2284
2285 ciEnv ci_env(task);
2286 if (should_break) {
2287 ci_env.set_break_at_compile(true);
2288 }
2289 if (should_log) {
2290 ci_env.set_log(thread->log());
2291 }
2292 assert(thread->env() == &ci_env, "set by ci_env");
2293 // The thread-env() field is cleared in ~CompileTaskWrapper.
2294
2295 // Cache Jvmti state
2296 bool method_is_old = ci_env.cache_jvmti_state();
2297
2298 // Skip redefined methods
2299 if (method_is_old) {
2300 ci_env.record_method_not_compilable("redefined method", true);
2301 }
2302
2303 // Cache DTrace flags
2304 ci_env.cache_dtrace_flags();
2305
2306 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2307
2308 TraceTime t1("compilation", &time);
2309 EventCompilation event;
2310
2311 if (comp == NULL) {
2312 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2313 } else if (!ci_env.failing()) {
2314 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2315 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2316 while (WhiteBox::compilation_locked) {
2317 locker.wait();
2318 }
2319 }
2320 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2321
2322 /* Repeat compilation without installing code for profiling purposes */
2323 int repeat_compilation_count = directive->RepeatCompilationOption;
2324 while (repeat_compilation_count > 0) {
2325 task->print_ul("NO CODE INSTALLED");
2326 comp->compile_method(&ci_env, target, osr_bci, false , directive);
2327 repeat_compilation_count--;
2328 }
2329 }
2330
2331 if (!ci_env.failing() && task->code() == NULL) {
2332 //assert(false, "compiler should always document failure");
2333 // The compiler elected, without comment, not to register a result.
2334 // Do not attempt further compilations of this method.
2335 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2336 }
2337
2338 // Copy this bit to the enclosing block:
2339 compilable = ci_env.compilable();
2340
2341 if (ci_env.failing()) {
2342 failure_reason = ci_env.failure_reason();
2343 retry_message = ci_env.retry_message();
2344 ci_env.report_failure(failure_reason);
2345 }
2346
2347 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason);
2348 if (event.should_commit()) {
2349 post_compilation_event(event, task);
2350 }
2351 }
2352 // Remove the JNI handle block after the ciEnv destructor has run in
2353 // the previous block.
2354 pop_jni_handle_block();
2355
2356 if (failure_reason != NULL) {
2357 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2358 if (_compilation_log != NULL) {
2359 _compilation_log->log_failure(thread, task, failure_reason, retry_message);
2360 }
2361 if (PrintCompilation) {
2362 FormatBufferResource msg = retry_message != NULL ?
2363 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2364 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2365 task->print(tty, msg);
2366 }
2367 }
2368
2369 methodHandle method(thread, task->method());
2370
2371 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2372
2373 collect_statistics(thread, time, task);
2374
2375 nmethod* nm = task->code();
2376 if (nm != NULL) {
2377 nm->maybe_print_nmethod(directive);
2378 }
2379 DirectivesStack::release(directive);
2380
2381 if (PrintCompilation && PrintCompilation2) {
2382 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2383 tty->print("%4d ", compile_id); // print compilation number
2384 tty->print("%s ", (is_osr ? "%" : " "));
2385 if (task->code() != NULL) {
2386 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2387 }
2388 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2389 }
2390
2391 Log(compilation, codecache) log;
2392 if (log.is_debug()) {
2393 LogStream ls(log.debug());
2394 codecache_print(&ls, /* detailed= */ false);
2395 }
2396 if (PrintCodeCacheOnCompilation) {
2397 codecache_print(/* detailed= */ false);
2398 }
2399 // Disable compilation, if required.
2400 switch (compilable) {
2401 case ciEnv::MethodCompilable_never:
2402 if (is_osr)
2403 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2404 else
2405 method->set_not_compilable_quietly("MethodCompilable_never");
2406 break;
2407 case ciEnv::MethodCompilable_not_at_tier:
2408 if (is_osr)
2409 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2410 else
2411 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2412 break;
2413 }
2414
2415 // Note that the queued_for_compilation bits are cleared without
2416 // protection of a mutex. [They were set by the requester thread,
2417 // when adding the task to the compile queue -- at which time the
2418 // compile queue lock was held. Subsequently, we acquired the compile
2419 // queue lock to get this task off the compile queue; thus (to belabour
2420 // the point somewhat) our clearing of the bits must be occurring
2421 // only after the setting of the bits. See also 14012000 above.
2422 method->clear_queued_for_compilation();
2423 }
2424
2425 /**
2426 * The CodeCache is full. Print warning and disable compilation.
2427 * Schedule code cache cleaning so compilation can continue later.
2428 * This function needs to be called only from CodeCache::allocate(),
2429 * since we currently handle a full code cache uniformly.
2430 */
2431 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2432 UseInterpreter = true;
2433 if (UseCompiler || AlwaysCompileLoopMethods ) {
2434 if (xtty != NULL) {
2435 ResourceMark rm;
2436 stringStream s;
2437 // Dump code cache state into a buffer before locking the tty,
2438 // because log_state() will use locks causing lock conflicts.
2439 CodeCache::log_state(&s);
2440 // Lock to prevent tearing
2441 ttyLocker ttyl;
2442 xtty->begin_elem("code_cache_full");
2443 xtty->print("%s", s.as_string());
2444 xtty->stamp();
2445 xtty->end_elem();
2446 }
2447
2448 #ifndef PRODUCT
2449 if (ExitOnFullCodeCache) {
2450 codecache_print(/* detailed= */ true);
2451 before_exit(JavaThread::current());
2452 exit_globals(); // will delete tty
2453 vm_direct_exit(1);
2454 }
2455 #endif
2456 if (UseCodeCacheFlushing) {
2457 // Since code cache is full, immediately stop new compiles
2458 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2459 NMethodSweeper::log_sweep("disable_compiler");
2460 }
2461 } else {
2462 disable_compilation_forever();
2463 }
2464
2465 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2466 }
2467 }
2468
2469 // ------------------------------------------------------------------
2470 // CompileBroker::update_compile_perf_data
2471 //
2472 // Record this compilation for debugging purposes.
2473 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2474 ResourceMark rm;
2475 char* method_name = method->name()->as_C_string();
2476 char current_method[CompilerCounters::cmname_buffer_length];
2477 size_t maxLen = CompilerCounters::cmname_buffer_length;
2478
2479 const char* class_name = method->method_holder()->name()->as_C_string();
2480
2481 size_t s1len = strlen(class_name);
2482 size_t s2len = strlen(method_name);
2483
2484 // check if we need to truncate the string
2485 if (s1len + s2len + 2 > maxLen) {
2486
2487 // the strategy is to lop off the leading characters of the
2488 // class name and the trailing characters of the method name.
2489
2490 if (s2len + 2 > maxLen) {
2491 // lop of the entire class name string, let snprintf handle
2492 // truncation of the method name.
2493 class_name += s1len; // null string
2494 }
2495 else {
2496 // lop off the extra characters from the front of the class name
2497 class_name += ((s1len + s2len + 2) - maxLen);
2498 }
2499 }
2500
2501 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2502
2503 int last_compile_type = normal_compile;
2504 if (CICountOSR && is_osr) {
2505 last_compile_type = osr_compile;
2506 }
2507
2508 CompilerCounters* counters = thread->counters();
2509 counters->set_current_method(current_method);
2510 counters->set_compile_type((jlong) last_compile_type);
2511 }
2512
2513 // ------------------------------------------------------------------
2514 // CompileBroker::push_jni_handle_block
2515 //
2516 // Push on a new block of JNI handles.
2517 void CompileBroker::push_jni_handle_block() {
2518 JavaThread* thread = JavaThread::current();
2519
2520 // Allocate a new block for JNI handles.
2521 // Inlined code from jni_PushLocalFrame()
2522 JNIHandleBlock* java_handles = thread->active_handles();
2523 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2524 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2525 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2526 thread->set_active_handles(compile_handles);
2527 }
2528
2529
2530 // ------------------------------------------------------------------
2531 // CompileBroker::pop_jni_handle_block
2532 //
2533 // Pop off the current block of JNI handles.
2534 void CompileBroker::pop_jni_handle_block() {
2535 JavaThread* thread = JavaThread::current();
2536
2537 // Release our JNI handle block
2538 JNIHandleBlock* compile_handles = thread->active_handles();
2539 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2540 thread->set_active_handles(java_handles);
2541 compile_handles->set_pop_frame_link(NULL);
2542 JNIHandleBlock::release_block(compile_handles, thread); // may block
2543 }
2544
2545 // ------------------------------------------------------------------
2546 // CompileBroker::collect_statistics
2547 //
2548 // Collect statistics about the compilation.
2549
2550 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2551 bool success = task->is_success();
2552 methodHandle method (thread, task->method());
2553 uint compile_id = task->compile_id();
2554 bool is_osr = (task->osr_bci() != standard_entry_bci);
2555 const int comp_level = task->comp_level();
2556 nmethod* code = task->code();
2557 CompilerCounters* counters = thread->counters();
2558
2559 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2560 MutexLocker locker(CompileStatistics_lock);
2561
2562 // _perf variables are production performance counters which are
2563 // updated regardless of the setting of the CITime and CITimeEach flags
2564 //
2565
2566 // account all time, including bailouts and failures in this counter;
2567 // C1 and C2 counters are counting both successful and unsuccessful compiles
2568 _t_total_compilation.add(time);
2569
2570 if (!success) {
2571 _total_bailout_count++;
2572 if (UsePerfData) {
2573 _perf_last_failed_method->set_value(counters->current_method());
2574 _perf_last_failed_type->set_value(counters->compile_type());
2575 _perf_total_bailout_count->inc();
2576 }
2577 _t_bailedout_compilation.add(time);
2578 } else if (code == NULL) {
2579 if (UsePerfData) {
2580 _perf_last_invalidated_method->set_value(counters->current_method());
2581 _perf_last_invalidated_type->set_value(counters->compile_type());
2582 _perf_total_invalidated_count->inc();
2583 }
2584 _total_invalidated_count++;
2585 _t_invalidated_compilation.add(time);
2586 } else {
2587 // Compilation succeeded
2588
2589 // update compilation ticks - used by the implementation of
2590 // java.lang.management.CompilationMXBean
2591 _perf_total_compilation->inc(time.ticks());
2592 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2593
2594 if (CITime) {
2595 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2596 if (is_osr) {
2597 _t_osr_compilation.add(time);
2598 _sum_osr_bytes_compiled += bytes_compiled;
2599 } else {
2600 _t_standard_compilation.add(time);
2601 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2602 }
2603
2604 // Collect statistic per compilation level
2605 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2606 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2607 if (is_osr) {
2608 stats->_osr.update(time, bytes_compiled);
2609 } else {
2610 stats->_standard.update(time, bytes_compiled);
2611 }
2612 stats->_nmethods_size += code->total_size();
2613 stats->_nmethods_code_size += code->insts_size();
2614 } else {
2615 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2616 }
2617
2618 // Collect statistic per compiler
2619 AbstractCompiler* comp = compiler(comp_level);
2620 if (comp) {
2621 CompilerStatistics* stats = comp->stats();
2622 if (is_osr) {
2623 stats->_osr.update(time, bytes_compiled);
2624 } else {
2625 stats->_standard.update(time, bytes_compiled);
2626 }
2627 stats->_nmethods_size += code->total_size();
2628 stats->_nmethods_code_size += code->insts_size();
2629 } else { // if (!comp)
2630 assert(false, "Compiler object must exist");
2631 }
2632 }
2633
2634 if (UsePerfData) {
2635 // save the name of the last method compiled
2636 _perf_last_method->set_value(counters->current_method());
2637 _perf_last_compile_type->set_value(counters->compile_type());
2638 _perf_last_compile_size->set_value(method->code_size() +
2639 task->num_inlined_bytecodes());
2640 if (is_osr) {
2641 _perf_osr_compilation->inc(time.ticks());
2642 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2643 } else {
2644 _perf_standard_compilation->inc(time.ticks());
2645 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2646 }
2647 }
2648
2649 if (CITimeEach) {
2650 double compile_time = time.seconds();
2651 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2652 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2653 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2654 }
2655
2656 // Collect counts of successful compilations
2657 _sum_nmethod_size += code->total_size();
2658 _sum_nmethod_code_size += code->insts_size();
2659 _total_compile_count++;
2660
2661 if (UsePerfData) {
2662 _perf_sum_nmethod_size->inc( code->total_size());
2663 _perf_sum_nmethod_code_size->inc(code->insts_size());
2664 _perf_total_compile_count->inc();
2665 }
2666
2667 if (is_osr) {
2668 if (UsePerfData) _perf_total_osr_compile_count->inc();
2669 _total_osr_compile_count++;
2670 } else {
2671 if (UsePerfData) _perf_total_standard_compile_count->inc();
2672 _total_standard_compile_count++;
2673 }
2674 }
2675 // set the current method for the thread to null
2676 if (UsePerfData) counters->set_current_method("");
2677 }
2678
2679 const char* CompileBroker::compiler_name(int comp_level) {
2680 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2681 if (comp == NULL) {
2682 return "no compiler";
2683 } else {
2684 return (comp->name());
2685 }
2686 }
2687
2688 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2689 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}",
2690 name, stats->bytes_per_second(),
2691 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2692 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2693 stats->_nmethods_size, stats->_nmethods_code_size);
2694 }
2695
2696 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2697 if (per_compiler) {
2698 if (aggregate) {
2699 tty->cr();
2700 tty->print_cr("Individual compiler times (for compiled methods only)");
2701 tty->print_cr("------------------------------------------------");
2702 tty->cr();
2703 }
2704 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2705 AbstractCompiler* comp = _compilers[i];
2706 if (comp != NULL) {
2707 print_times(comp->name(), comp->stats());
2708 }
2709 }
2710 if (aggregate) {
2711 tty->cr();
2712 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2713 tty->print_cr("------------------------------------------------");
2714 tty->cr();
2715 }
2716 char tier_name[256];
2717 for (int tier = CompLevel_simple; tier <= CompLevel_highest_tier; tier++) {
2718 CompilerStatistics* stats = &_stats_per_level[tier-1];
2719 sprintf(tier_name, "Tier%d", tier);
2720 print_times(tier_name, stats);
2721 }
2722 }
2723
2724 #if INCLUDE_JVMCI
2725 // In hosted mode, print the JVMCI compiler specific counters manually.
2726 if (EnableJVMCI && !UseJVMCICompiler) {
2727 JVMCICompiler::print_compilation_timers();
2728 }
2729 #endif
2730
2731 if (!aggregate) {
2732 return;
2733 }
2734
2735 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2736 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2737 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2738
2739 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2740 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2741
2742 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2743 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2744 int total_compile_count = CompileBroker::_total_compile_count;
2745 int total_bailout_count = CompileBroker::_total_bailout_count;
2746 int total_invalidated_count = CompileBroker::_total_invalidated_count;
2747
2748 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2749 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2750
2751 tty->cr();
2752 tty->print_cr("Accumulated compiler times");
2753 tty->print_cr("----------------------------------------------------------");
2754 //0000000000111111111122222222223333333333444444444455555555556666666666
2755 //0123456789012345678901234567890123456789012345678901234567890123456789
2756 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2757 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2758 standard_compilation.seconds(),
2759 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2760 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2761 CompileBroker::_t_bailedout_compilation.seconds(),
2762 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2763 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2764 osr_compilation.seconds(),
2765 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2766 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2767 CompileBroker::_t_invalidated_compilation.seconds(),
2768 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2769
2770 AbstractCompiler *comp = compiler(CompLevel_simple);
2771 if (comp != NULL) {
2772 tty->cr();
2773 comp->print_timers();
2774 }
2775 comp = compiler(CompLevel_full_optimization);
2776 if (comp != NULL) {
2777 tty->cr();
2778 comp->print_timers();
2779 }
2780 tty->cr();
2781 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2782 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2783 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2784 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2785 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2786 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2787 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2788 double tcs = total_compilation.seconds();
2789 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2790 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2791 tty->cr();
2792 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2793 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2794 }
2795
2796 // Print general/accumulated JIT information.
2797 void CompileBroker::print_info(outputStream *out) {
2798 if (out == NULL) out = tty;
2799 out->cr();
2800 out->print_cr("======================");
2801 out->print_cr(" General JIT info ");
2802 out->print_cr("======================");
2803 out->cr();
2804 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2805 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2806 out->cr();
2807 out->print_cr("CodeCache overview");
2808 out->print_cr("--------------------------------------------------------");
2809 out->cr();
2810 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2811 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2812 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2813 out->cr();
2814
2815 out->cr();
2816 out->print_cr("CodeCache cleaning overview");
2817 out->print_cr("--------------------------------------------------------");
2818 out->cr();
2819 NMethodSweeper::print(out);
2820 out->print_cr("--------------------------------------------------------");
2821 out->cr();
2822 }
2823
2824 // Note: tty_lock must not be held upon entry to this function.
2825 // Print functions called from herein do "micro-locking" on tty_lock.
2826 // That's a tradeoff which keeps together important blocks of output.
2827 // At the same time, continuous tty_lock hold time is kept in check,
2828 // preventing concurrently printing threads from stalling a long time.
2829 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2830 TimeStamp ts_total;
2831 TimeStamp ts_global;
2832 TimeStamp ts;
2833
2834 bool allFun = !strcmp(function, "all");
2835 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2836 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2837 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2838 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2839 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2840 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2841 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2842 bool discard = !strcmp(function, "discard") || allFun;
2843
2844 if (out == NULL) {
2845 out = tty;
2846 }
2847
2848 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2849 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2850 out->cr();
2851 return;
2852 }
2853
2854 ts_total.update(); // record starting point
2855
2856 if (aggregate) {
2857 print_info(out);
2858 }
2859
2860 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2861 // That prevents another thread from destroying our view on the CodeHeap.
2862 // When we request individual parts of the analysis via the jcmd interface, it is possible
2863 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2864 // updated the aggregated data. That's a tolerable tradeoff because we can't hold a lock
2865 // across user interaction.
2866 // Acquire this lock before acquiring the CodeCache_lock.
2867 // CodeHeapStateAnalytics_lock could be held by a concurrent thread for a long time,
2868 // leading to an unnecessarily long hold time of the CodeCache_lock.
2869 ts.update(); // record starting point
2870 MutexLocker mu1(CodeHeapStateAnalytics_lock, Mutex::_no_safepoint_check_flag);
2871 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2872
2873 // If we serve an "allFun" call, it is beneficial to hold the CodeCache_lock
2874 // for the entire duration of aggregation and printing. That makes sure
2875 // we see a consistent picture and do not run into issues caused by
2876 // the CodeHeap being altered concurrently.
2877 Mutex* global_lock = allFun ? CodeCache_lock : NULL;
2878 Mutex* function_lock = allFun ? NULL : CodeCache_lock;
2879 ts_global.update(); // record starting point
2880 MutexLocker mu2(global_lock, Mutex::_no_safepoint_check_flag);
2881 if (global_lock != NULL) {
2882 out->print_cr("\n__ CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2883 ts_global.update(); // record starting point
2884 }
2885
2886 if (aggregate) {
2887 ts.update(); // record starting point
2888 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2889 if (function_lock != NULL) {
2890 out->print_cr("\n__ CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2891 }
2892
2893 ts.update(); // record starting point
2894 CodeCache::aggregate(out, granularity);
2895 if (function_lock != NULL) {
2896 out->print_cr("\n__ CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2897 }
2898 }
2899
2900 if (usedSpace) CodeCache::print_usedSpace(out);
2901 if (freeSpace) CodeCache::print_freeSpace(out);
2902 if (methodCount) CodeCache::print_count(out);
2903 if (methodSpace) CodeCache::print_space(out);
2904 if (methodAge) CodeCache::print_age(out);
2905 if (methodNames) {
2906 // print_names() has shown to be sensitive to concurrent CodeHeap modifications.
2907 // Therefore, request the CodeCache_lock before calling...
2908 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2909 CodeCache::print_names(out);
2910 }
2911 if (discard) CodeCache::discard(out);
2912
2913 if (global_lock != NULL) {
2914 out->print_cr("\n__ CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2915 }
2916 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2917 }