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 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
185 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
186
187
188
189 class CompilationLog : public StringEventLog {
190 public:
191 CompilationLog() : StringEventLog("Compilation events", "jit") {
192 }
193
194 void log_compile(JavaThread* thread, CompileTask* task) {
195 StringLogMessage lm;
196 stringStream sstr(lm.buffer(), lm.size());
197 // msg.time_stamp().update_to(tty->time_stamp().ticks());
198 task->print(&sstr, NULL, true, false);
199 log(thread, "%s", (const char*)lm);
200 }
201
202 void log_nmethod(JavaThread* thread, nmethod* nm) {
203 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
204 nm->compile_id(), nm->is_osr_method() ? "%" : "",
205 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
206 }
207
208 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
209 StringLogMessage lm;
210 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
211 if (retry_message != NULL) {
212 lm.append(" (%s)", retry_message);
213 }
214 lm.print("\n");
215 log(thread, "%s", (const char*)lm);
216 }
217
218 void log_metaspace_failure(const char* reason) {
219 ResourceMark rm;
220 StringLogMessage lm;
221 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
222 lm.print("\n");
223 log(JavaThread::current(), "%s", (const char*)lm);
224 }
225 };
226
227 static CompilationLog* _compilation_log = NULL;
228
229 bool compileBroker_init() {
230 if (LogEvents) {
231 _compilation_log = new CompilationLog();
232 }
233
234 // init directives stack, adding default directive
235 DirectivesStack::init();
236
237 if (DirectivesParser::has_file()) {
238 return DirectivesParser::parse_from_flag();
239 } else if (CompilerDirectivesPrint) {
240 // Print default directive even when no other was added
241 DirectivesStack::print(tty);
242 }
243
244 return true;
245 }
246
247 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
248 CompilerThread* thread = CompilerThread::current();
249 thread->set_task(task);
250 #if INCLUDE_JVMCI
251 if (task->is_blocking() && CompileBroker::compiler(task->comp_level())->is_jvmci()) {
252 task->set_jvmci_compiler_thread(thread);
253 }
254 #endif
255 CompileLog* log = thread->log();
256 if (log != NULL && !task->is_unloaded()) task->log_task_start(log);
257 }
258
259 CompileTaskWrapper::~CompileTaskWrapper() {
260 CompilerThread* thread = CompilerThread::current();
261 CompileTask* task = thread->task();
262 CompileLog* log = thread->log();
263 if (log != NULL && !task->is_unloaded()) task->log_task_done(log);
264 thread->set_task(NULL);
265 task->set_code_handle(NULL);
266 thread->set_env(NULL);
267 if (task->is_blocking()) {
268 bool free_task = false;
269 {
270 MutexLocker notifier(thread, task->lock());
271 task->mark_complete();
272 #if INCLUDE_JVMCI
273 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
274 if (!task->has_waiter()) {
275 // The waiting thread timed out and thus did not free the task.
276 free_task = true;
277 }
278 task->set_jvmci_compiler_thread(NULL);
279 }
280 #endif
281 if (!free_task) {
282 // Notify the waiting thread that the compilation has completed
283 // so that it can free the task.
284 task->lock()->notify_all();
285 }
286 }
287 if (free_task) {
288 // The task can only be freed once the task lock is released.
289 CompileTask::free(task);
290 }
291 } else {
292 task->mark_complete();
293
294 // By convention, the compiling thread is responsible for
295 // recycling a non-blocking CompileTask.
296 CompileTask::free(task);
297 }
298 }
299
300 /**
301 * Check if a CompilerThread can be removed and update count if requested.
302 */
303 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
304 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
305 if (!ReduceNumberOfCompilerThreads) return false;
306
307 AbstractCompiler *compiler = ct->compiler();
308 int compiler_count = compiler->num_compiler_threads();
309 bool c1 = compiler->is_c1();
310
311 // Keep at least 1 compiler thread of each type.
312 if (compiler_count < 2) return false;
313
314 // Keep thread alive for at least some time.
315 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
316
317 #if INCLUDE_JVMCI
318 if (compiler->is_jvmci()) {
319 // Handles for JVMCI thread objects may get released concurrently.
320 if (do_it) {
321 assert(CompileThread_lock->owner() == ct, "must be holding lock");
322 } else {
323 // Skip check if it's the last thread and let caller check again.
324 return true;
325 }
326 }
327 #endif
328
329 // We only allow the last compiler thread of each type to get removed.
330 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
331 : compiler2_object(compiler_count - 1);
332 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
333 if (do_it) {
334 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
335 compiler->set_num_compiler_threads(compiler_count - 1);
336 #if INCLUDE_JVMCI
337 if (compiler->is_jvmci()) {
338 // Old j.l.Thread object can die when no longer referenced elsewhere.
339 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
340 _compiler2_objects[compiler_count - 1] = NULL;
341 }
342 #endif
343 }
344 return true;
345 }
346 return false;
347 }
348
349 /**
350 * Add a CompileTask to a CompileQueue.
351 */
352 void CompileQueue::add(CompileTask* task) {
353 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
354
355 task->set_next(NULL);
356 task->set_prev(NULL);
357
358 if (_last == NULL) {
359 // The compile queue is empty.
360 assert(_first == NULL, "queue is empty");
361 _first = task;
362 _last = task;
363 } else {
364 // Append the task to the queue.
365 assert(_last->next() == NULL, "not last");
366 _last->set_next(task);
367 task->set_prev(_last);
368 _last = task;
369 }
370 ++_size;
371
372 // Mark the method as being in the compile queue.
373 task->method()->set_queued_for_compilation();
374
375 if (CIPrintCompileQueue) {
376 print_tty();
377 }
378
379 if (LogCompilation && xtty != NULL) {
380 task->log_task_queued();
381 }
382
383 // Notify CompilerThreads that a task is available.
384 MethodCompileQueue_lock->notify_all();
385 }
386
387 /**
388 * Empties compilation queue by putting all compilation tasks onto
389 * a freelist. Furthermore, the method wakes up all threads that are
390 * waiting on a compilation task to finish. This can happen if background
391 * compilation is disabled.
392 */
393 void CompileQueue::free_all() {
394 MutexLocker mu(MethodCompileQueue_lock);
395 CompileTask* next = _first;
396
397 // Iterate over all tasks in the compile queue
398 while (next != NULL) {
399 CompileTask* current = next;
400 next = current->next();
401 {
402 // Wake up thread that blocks on the compile task.
403 MutexLocker ct_lock(current->lock());
404 current->lock()->notify();
405 }
406 // Put the task back on the freelist.
407 CompileTask::free(current);
408 }
409 _first = NULL;
410
411 // Wake up all threads that block on the queue.
412 MethodCompileQueue_lock->notify_all();
413 }
414
415 /**
416 * Get the next CompileTask from a CompileQueue
417 */
418 CompileTask* CompileQueue::get() {
419 // save methods from RedefineClasses across safepoint
420 // across MethodCompileQueue_lock below.
421 methodHandle save_method;
422 methodHandle save_hot_method;
423
424 MonitorLocker locker(MethodCompileQueue_lock);
425 // If _first is NULL we have no more compile jobs. There are two reasons for
426 // having no compile jobs: First, we compiled everything we wanted. Second,
427 // we ran out of code cache so compilation has been disabled. In the latter
428 // case we perform code cache sweeps to free memory such that we can re-enable
429 // compilation.
430 while (_first == NULL) {
431 // Exit loop if compilation is disabled forever
432 if (CompileBroker::is_compilation_disabled_forever()) {
433 return NULL;
434 }
435
436 // If there are no compilation tasks and we can compile new jobs
437 // (i.e., there is enough free space in the code cache) there is
438 // no need to invoke the sweeper. As a result, the hotness of methods
439 // remains unchanged. This behavior is desired, since we want to keep
440 // the stable state, i.e., we do not want to evict methods from the
441 // code cache if it is unnecessary.
442 // We need a timed wait here, since compiler threads can exit if compilation
443 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
444 // is not critical and we do not want idle compiler threads to wake up too often.
445 locker.wait(5*1000);
446
447 if (UseDynamicNumberOfCompilerThreads && _first == NULL) {
448 // Still nothing to compile. Give caller a chance to stop this thread.
449 if (CompileBroker::can_remove(CompilerThread::current(), false)) return NULL;
450 }
451 }
452
453 if (CompileBroker::is_compilation_disabled_forever()) {
454 return NULL;
455 }
456
457 CompileTask* task;
458 {
459 NoSafepointVerifier nsv;
460 task = CompilationPolicy::policy()->select_task(this);
461 if (task != NULL) {
462 task = task->select_for_compilation();
463 }
464 }
465
466 if (task != NULL) {
467 // Save method pointers across unlock safepoint. The task is removed from
468 // the compilation queue, which is walked during RedefineClasses.
469 Thread* thread = Thread::current();
470 save_method = methodHandle(thread, task->method());
471 save_hot_method = methodHandle(thread, task->hot_method());
472
473 remove(task);
474 }
475 purge_stale_tasks(); // may temporarily release MCQ lock
476 return task;
477 }
478
479 // Clean & deallocate stale compile tasks.
480 // Temporarily releases MethodCompileQueue lock.
481 void CompileQueue::purge_stale_tasks() {
482 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
483 if (_first_stale != NULL) {
484 // Stale tasks are purged when MCQ lock is released,
485 // but _first_stale updates are protected by MCQ lock.
486 // Once task processing starts and MCQ lock is released,
487 // other compiler threads can reuse _first_stale.
488 CompileTask* head = _first_stale;
489 _first_stale = NULL;
490 {
491 MutexUnlocker ul(MethodCompileQueue_lock);
492 for (CompileTask* task = head; task != NULL; ) {
493 CompileTask* next_task = task->next();
494 CompileTaskWrapper ctw(task); // Frees the task
495 task->set_failure_reason("stale task");
496 task = next_task;
497 }
498 }
499 }
500 }
501
502 void CompileQueue::remove(CompileTask* task) {
503 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
504 if (task->prev() != NULL) {
505 task->prev()->set_next(task->next());
506 } else {
507 // max is the first element
508 assert(task == _first, "Sanity");
509 _first = task->next();
510 }
511
512 if (task->next() != NULL) {
513 task->next()->set_prev(task->prev());
514 } else {
515 // max is the last element
516 assert(task == _last, "Sanity");
517 _last = task->prev();
518 }
519 --_size;
520 }
521
522 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
523 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
524 remove(task);
525
526 // Enqueue the task for reclamation (should be done outside MCQ lock)
527 task->set_next(_first_stale);
528 task->set_prev(NULL);
529 _first_stale = task;
530 }
531
532 // methods in the compile queue need to be marked as used on the stack
533 // so that they don't get reclaimed by Redefine Classes
534 void CompileQueue::mark_on_stack() {
535 CompileTask* task = _first;
536 while (task != NULL) {
537 task->mark_on_stack();
538 task = task->next();
539 }
540 }
541
542
543 CompileQueue* CompileBroker::compile_queue(int comp_level) {
544 if (is_c2_compile(comp_level)) return _c2_compile_queue;
545 if (is_c1_compile(comp_level)) return _c1_compile_queue;
546 return NULL;
547 }
548
549 void CompileBroker::print_compile_queues(outputStream* st) {
550 st->print_cr("Current compiles: ");
551
552 char buf[2000];
553 int buflen = sizeof(buf);
554 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
555
556 st->cr();
557 if (_c1_compile_queue != NULL) {
558 _c1_compile_queue->print(st);
559 }
560 if (_c2_compile_queue != NULL) {
561 _c2_compile_queue->print(st);
562 }
563 }
564
565 void CompileQueue::print(outputStream* st) {
566 assert_locked_or_safepoint(MethodCompileQueue_lock);
567 st->print_cr("%s:", name());
568 CompileTask* task = _first;
569 if (task == NULL) {
570 st->print_cr("Empty");
571 } else {
572 while (task != NULL) {
573 task->print(st, NULL, true, true);
574 task = task->next();
575 }
576 }
577 st->cr();
578 }
579
580 void CompileQueue::print_tty() {
581 ResourceMark rm;
582 stringStream ss;
583 // Dump the compile queue into a buffer before locking the tty
584 print(&ss);
585 {
586 ttyLocker ttyl;
587 tty->print("%s", ss.as_string());
588 }
589 }
590
591 CompilerCounters::CompilerCounters() {
592 _current_method[0] = '\0';
593 _compile_type = CompileBroker::no_compile;
594 }
595
596 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
597 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
598 // in compiler/compilerEvent.cpp) and registers it with its serializer.
599 //
600 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
601 // so if c2 is used, it should be always registered first.
602 // This function is called during vm initialization.
603 void register_jfr_phasetype_serializer(CompilerType compiler_type) {
604 ResourceMark rm;
605 static bool first_registration = true;
606 if (compiler_type == compiler_jvmci) {
607 // register serializer, phases will be added later lazily.
608 GrowableArray<const char*>* jvmci_phase_names = new GrowableArray<const char*>(1);
609 jvmci_phase_names->append("NOT_A_PHASE_NAME");
610 CompilerEvent::PhaseEvent::register_phases(jvmci_phase_names);
611 first_registration = false;
612 #ifdef COMPILER2
613 } else if (compiler_type == compiler_c2) {
614 assert(first_registration, "invariant"); // c2 must be registered first.
615 GrowableArray<const char*>* c2_phase_names = new GrowableArray<const char*>(PHASE_NUM_TYPES);
616 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
617 c2_phase_names->append(CompilerPhaseTypeHelper::to_string((CompilerPhaseType)i));
618 }
619 CompilerEvent::PhaseEvent::register_phases(c2_phase_names);
620 first_registration = false;
621 #endif // COMPILER2
622 }
623 }
624 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
625
626 // ------------------------------------------------------------------
627 // CompileBroker::compilation_init
628 //
629 // Initialize the Compilation object
630 void CompileBroker::compilation_init_phase1(Thread* THREAD) {
631 // No need to initialize compilation system if we do not use it.
632 if (!UseCompiler) {
633 return;
634 }
635 // Set the interface to the current compiler(s).
636 _c1_count = CompilationPolicy::policy()->compiler_count(CompLevel_simple);
637 _c2_count = CompilationPolicy::policy()->compiler_count(CompLevel_full_optimization);
638
639 #if INCLUDE_JVMCI
640 if (EnableJVMCI) {
641 // This is creating a JVMCICompiler singleton.
642 JVMCICompiler* jvmci = new JVMCICompiler();
643
644 if (UseJVMCICompiler) {
645 _compilers[1] = jvmci;
646 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
647 if (BootstrapJVMCI) {
648 // JVMCI will bootstrap so give it more threads
649 _c2_count = MIN2(32, os::active_processor_count());
650 }
651 } else {
652 _c2_count = JVMCIThreads;
653 }
654 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
655 } else {
656 _c1_count = JVMCIHostThreads;
657 }
658 }
659 }
660 #endif // INCLUDE_JVMCI
661
662 #ifdef COMPILER1
663 if (_c1_count > 0) {
664 _compilers[0] = new Compiler();
665 }
666 #endif // COMPILER1
667
668 #ifdef COMPILER2
669 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
670 if (_c2_count > 0) {
671 _compilers[1] = new C2Compiler();
672 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
673 // idToPhase mapping for c2 is in opto/phasetype.hpp
674 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
675 }
676 }
677 #endif // COMPILER2
678
679 #if INCLUDE_JVMCI
680 // Register after c2 registration.
681 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
682 if (EnableJVMCI) {
683 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
684 }
685 #endif // INCLUDE_JVMCI
686
687 // Start the compiler thread(s) and the sweeper thread
688 init_compiler_sweeper_threads();
689 // totalTime performance counter is always created as it is required
690 // by the implementation of java.lang.management.CompilationMXBean.
691 {
692 // Ensure OOM leads to vm_exit_during_initialization.
693 EXCEPTION_MARK;
694 _perf_total_compilation =
695 PerfDataManager::create_counter(JAVA_CI, "totalTime",
696 PerfData::U_Ticks, CHECK);
697 }
698
699 if (UsePerfData) {
700
701 EXCEPTION_MARK;
702
703 // create the jvmstat performance counters
704 _perf_osr_compilation =
705 PerfDataManager::create_counter(SUN_CI, "osrTime",
706 PerfData::U_Ticks, CHECK);
707
708 _perf_standard_compilation =
709 PerfDataManager::create_counter(SUN_CI, "standardTime",
710 PerfData::U_Ticks, CHECK);
711
712 _perf_total_bailout_count =
713 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
714 PerfData::U_Events, CHECK);
715
716 _perf_total_invalidated_count =
717 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
718 PerfData::U_Events, CHECK);
719
720 _perf_total_compile_count =
721 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
722 PerfData::U_Events, CHECK);
723 _perf_total_osr_compile_count =
724 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
725 PerfData::U_Events, CHECK);
726
727 _perf_total_standard_compile_count =
728 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
729 PerfData::U_Events, CHECK);
730
731 _perf_sum_osr_bytes_compiled =
732 PerfDataManager::create_counter(SUN_CI, "osrBytes",
733 PerfData::U_Bytes, CHECK);
734
735 _perf_sum_standard_bytes_compiled =
736 PerfDataManager::create_counter(SUN_CI, "standardBytes",
737 PerfData::U_Bytes, CHECK);
738
739 _perf_sum_nmethod_size =
740 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
741 PerfData::U_Bytes, CHECK);
742
743 _perf_sum_nmethod_code_size =
744 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
745 PerfData::U_Bytes, CHECK);
746
747 _perf_last_method =
748 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
749 CompilerCounters::cmname_buffer_length,
750 "", CHECK);
751
752 _perf_last_failed_method =
753 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
754 CompilerCounters::cmname_buffer_length,
755 "", CHECK);
756
757 _perf_last_invalidated_method =
758 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
759 CompilerCounters::cmname_buffer_length,
760 "", CHECK);
761
762 _perf_last_compile_type =
763 PerfDataManager::create_variable(SUN_CI, "lastType",
764 PerfData::U_None,
765 (jlong)CompileBroker::no_compile,
766 CHECK);
767
768 _perf_last_compile_size =
769 PerfDataManager::create_variable(SUN_CI, "lastSize",
770 PerfData::U_Bytes,
771 (jlong)CompileBroker::no_compile,
772 CHECK);
773
774
775 _perf_last_failed_type =
776 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
777 PerfData::U_None,
778 (jlong)CompileBroker::no_compile,
779 CHECK);
780
781 _perf_last_invalidated_type =
782 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
783 PerfData::U_None,
784 (jlong)CompileBroker::no_compile,
785 CHECK);
786 }
787 }
788
789 // Completes compiler initialization. Compilation requests submitted
790 // prior to this will be silently ignored.
791 void CompileBroker::compilation_init_phase2() {
792 _initialized = true;
793 }
794
795 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
796 Handle string = java_lang_String::create_from_str(name, CHECK_NH);
797 Handle thread_group(THREAD, Universe::system_thread_group());
798 return JavaCalls::construct_new_instance(
799 SystemDictionary::Thread_klass(),
800 vmSymbols::threadgroup_string_void_signature(),
801 thread_group,
802 string,
803 CHECK_NH);
804 }
805
806 #if defined(ASSERT) && COMPILER2_OR_JVMCI
807 // Stress testing. Revert optimizations based on escape analysis.
808 class DeoptimizeObjectsALotThread : public JavaThread {
809
810 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS);
811 void deoptimize_objects_alot_loop_single();
812 void deoptimize_objects_alot_loop_all();
813
814 public:
815 DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { }
816
817 bool is_hidden_from_external_view() const { return true; }
818 };
819
820 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
821 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
822 bool enter_single_loop;
823 {
824 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
825 static int single_thread_count = 0;
826 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
827 }
828 if (enter_single_loop) {
829 dt->deoptimize_objects_alot_loop_single();
830 } else {
831 dt->deoptimize_objects_alot_loop_all();
832 }
833 }
834
835 // Revert optimizations for a single deoptee_thread which gets selected round robin
836 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
837 HandleMark hm(this);
838 while (!this->is_terminated()) {
839 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
840 { // Begin new scope for escape barrier
841 HandleMarkCleaner hmc(this);
842 ResourceMark rm(this);
843 EscapeBarrier eb(this, deoptee_thread, true);
844 eb.deoptimize_objects(100);
845 }
846 // Now sleep after the escape barriers destructor resumed deoptee_thread.
847 sleep(DeoptimizeObjectsALotInterval);
848 }
849 }
850 }
851
852 // Revert optimizations for all threads at once
853 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
854 HandleMark hm(this);
855 while (!is_terminated()) {
856 { // Begin new scope for escape barrier
857 HandleMarkCleaner hmc(this);
858 ResourceMark rm(this);
859 EscapeBarrier eb(this, true);
860 eb.deoptimize_objects_all_threads();
861 }
862 // Now sleep after the escape barriers destructor resumed the java threads.
863 sleep(DeoptimizeObjectsALotInterval);
864 }
865 }
866 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
867
868
869 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, Thread* THREAD) {
870 JavaThread* new_thread = NULL;
871 {
872 MutexLocker mu(THREAD, Threads_lock);
873 switch (type) {
874 case compiler_t:
875 assert(comp != NULL, "Compiler instance missing.");
876 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
877 CompilerCounters* counters = new CompilerCounters();
878 new_thread = new CompilerThread(queue, counters);
879 }
880 break;
881 case sweeper_t:
882 new_thread = new CodeCacheSweeperThread();
883 break;
884 #if defined(ASSERT) && COMPILER2_OR_JVMCI
885 case deoptimizer_t:
886 new_thread = new DeoptimizeObjectsALotThread();
887 break;
888 #endif // ASSERT
889 default:
890 ShouldNotReachHere();
891 }
892
893 // At this point the new CompilerThread data-races with this startup
894 // thread (which I believe is the primoridal thread and NOT the VM
895 // thread). This means Java bytecodes being executed at startup can
896 // queue compile jobs which will run at whatever default priority the
897 // newly created CompilerThread runs at.
898
899
900 // At this point it may be possible that no osthread was created for the
901 // JavaThread due to lack of memory. We would have to throw an exception
902 // in that case. However, since this must work and we do not allow
903 // exceptions anyway, check and abort if this fails. But first release the
904 // lock.
905
906 if (new_thread != NULL && new_thread->osthread() != NULL) {
907
908 java_lang_Thread::set_thread(JNIHandles::resolve_non_null(thread_handle), new_thread);
909
910 // Note that this only sets the JavaThread _priority field, which by
911 // definition is limited to Java priorities and not OS priorities.
912 // The os-priority is set in the CompilerThread startup code itself
913
914 java_lang_Thread::set_priority(JNIHandles::resolve_non_null(thread_handle), NearMaxPriority);
915
916 // Note that we cannot call os::set_priority because it expects Java
917 // priorities and we are *explicitly* using OS priorities so that it's
918 // possible to set the compiler thread priority higher than any Java
919 // thread.
920
921 int native_prio = CompilerThreadPriority;
922 if (native_prio == -1) {
923 if (UseCriticalCompilerThreadPriority) {
924 native_prio = os::java_to_os_priority[CriticalPriority];
925 } else {
926 native_prio = os::java_to_os_priority[NearMaxPriority];
927 }
928 }
929 os::set_native_priority(new_thread, native_prio);
930
931 java_lang_Thread::set_daemon(JNIHandles::resolve_non_null(thread_handle));
932
933 new_thread->set_threadObj(JNIHandles::resolve_non_null(thread_handle));
934 if (type == compiler_t) {
935 new_thread->as_CompilerThread()->set_compiler(comp);
936 }
937 Threads::add(new_thread);
938 Thread::start(new_thread);
939 }
940 }
941
942 // First release lock before aborting VM.
943 if (new_thread == NULL || new_thread->osthread() == NULL) {
944 if (UseDynamicNumberOfCompilerThreads && type == compiler_t && comp->num_compiler_threads() > 0) {
945 if (new_thread != NULL) {
946 new_thread->smr_delete();
947 }
948 return NULL;
949 }
950 vm_exit_during_initialization("java.lang.OutOfMemoryError",
951 os::native_thread_creation_failed_msg());
952 }
953
954 // Let go of Threads_lock before yielding
955 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
956
957 return new_thread;
958 }
959
960
961 void CompileBroker::init_compiler_sweeper_threads() {
962 NMethodSweeper::set_sweep_threshold_bytes(static_cast<size_t>(SweeperThreshold * ReservedCodeCacheSize / 100.0));
963 log_info(codecache, sweep)("Sweeper threshold: " SIZE_FORMAT " bytes", NMethodSweeper::sweep_threshold_bytes());
964
965 // Ensure any exceptions lead to vm_exit_during_initialization.
966 EXCEPTION_MARK;
967 #if !defined(ZERO)
968 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
969 #endif // !ZERO
970 // Initialize the compilation queue
971 if (_c2_count > 0) {
972 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
973 _c2_compile_queue = new CompileQueue(name);
974 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
975 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
976 }
977 if (_c1_count > 0) {
978 _c1_compile_queue = new CompileQueue("C1 compile queue");
979 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
980 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
981 }
982
983 char name_buffer[256];
984
985 for (int i = 0; i < _c2_count; i++) {
986 jobject thread_handle = NULL;
987 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
988 // for JVMCI compiler which can create further ones on demand.
989 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
990 // Create a name for our thread.
991 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
992 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
993 thread_handle = JNIHandles::make_global(thread_oop);
994 JVMCI_ONLY(})
995 _compiler2_objects[i] = thread_handle;
996 _compiler2_logs[i] = NULL;
997
998 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
999 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
1000 assert(ct != NULL, "should have been handled for initial thread");
1001 _compilers[1]->set_num_compiler_threads(i + 1);
1002 if (TraceCompilerThreads) {
1003 ResourceMark rm;
1004 MutexLocker mu(Threads_lock);
1005 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
1006 }
1007 }
1008 }
1009
1010 for (int i = 0; i < _c1_count; i++) {
1011 // Create a name for our thread.
1012 sprintf(name_buffer, "C1 CompilerThread%d", i);
1013 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1014 jobject thread_handle = JNIHandles::make_global(thread_oop);
1015 _compiler1_objects[i] = thread_handle;
1016 _compiler1_logs[i] = NULL;
1017
1018 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1019 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
1020 assert(ct != NULL, "should have been handled for initial thread");
1021 _compilers[0]->set_num_compiler_threads(i + 1);
1022 if (TraceCompilerThreads) {
1023 ResourceMark rm;
1024 MutexLocker mu(Threads_lock);
1025 tty->print_cr("Added initial compiler thread %s", ct->get_thread_name());
1026 }
1027 }
1028 }
1029
1030 if (UsePerfData) {
1031 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
1032 }
1033
1034 if (MethodFlushing) {
1035 // Initialize the sweeper thread
1036 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK);
1037 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1038 make_thread(sweeper_t, thread_handle, NULL, NULL, THREAD);
1039 }
1040
1041 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1042 if (DeoptimizeObjectsALot) {
1043 // Initialize and start the object deoptimizer threads
1044 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1045 for (int count = 0; count < total_count; count++) {
1046 Handle thread_oop = create_thread_oop("Deoptimize objects a lot single mode", CHECK);
1047 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1048 make_thread(deoptimizer_t, thread_handle, NULL, NULL, THREAD);
1049 }
1050 }
1051 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1052 }
1053
1054 void CompileBroker::possibly_add_compiler_threads(Thread* THREAD) {
1055
1056 julong available_memory = os::available_memory();
1057 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1058 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1059 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1060
1061 // Only do attempt to start additional threads if the lock is free.
1062 if (!CompileThread_lock->try_lock()) return;
1063
1064 if (_c2_compile_queue != NULL) {
1065 int old_c2_count = _compilers[1]->num_compiler_threads();
1066 int new_c2_count = MIN4(_c2_count,
1067 _c2_compile_queue->size() / 2,
1068 (int)(available_memory / (200*M)),
1069 (int)(available_cc_np / (128*K)));
1070
1071 for (int i = old_c2_count; i < new_c2_count; i++) {
1072 #if INCLUDE_JVMCI
1073 if (UseJVMCICompiler) {
1074 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
1075 // objects as their existence is completely hidden from the rest of
1076 // the VM (and those compiler threads can't call Java code to do the
1077 // creation anyway). For JVMCI we have to create new j.l.Thread objects
1078 // as they are visible and we can see unexpected thread lifecycle
1079 // transitions if we bind them to new JavaThreads.
1080 if (!THREAD->can_call_java()) break;
1081 char name_buffer[256];
1082 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
1083 Handle thread_oop;
1084 {
1085 // We have to give up the lock temporarily for the Java calls.
1086 MutexUnlocker mu(CompileThread_lock);
1087 thread_oop = create_thread_oop(name_buffer, THREAD);
1088 }
1089 if (HAS_PENDING_EXCEPTION) {
1090 if (TraceCompilerThreads) {
1091 ResourceMark rm;
1092 tty->print_cr("JVMCI compiler thread creation failed:");
1093 PENDING_EXCEPTION->print();
1094 }
1095 CLEAR_PENDING_EXCEPTION;
1096 break;
1097 }
1098 // Check if another thread has beaten us during the Java calls.
1099 if (_compilers[1]->num_compiler_threads() != i) break;
1100 jobject thread_handle = JNIHandles::make_global(thread_oop);
1101 assert(compiler2_object(i) == NULL, "Old one must be released!");
1102 _compiler2_objects[i] = thread_handle;
1103 }
1104 #endif
1105 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1106 if (ct == NULL) break;
1107 _compilers[1]->set_num_compiler_threads(i + 1);
1108 if (TraceCompilerThreads) {
1109 ResourceMark rm;
1110 MutexLocker mu(Threads_lock);
1111 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
1112 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_np/M));
1113 }
1114 }
1115 }
1116
1117 if (_c1_compile_queue != NULL) {
1118 int old_c1_count = _compilers[0]->num_compiler_threads();
1119 int new_c1_count = MIN4(_c1_count,
1120 _c1_compile_queue->size() / 4,
1121 (int)(available_memory / (100*M)),
1122 (int)(available_cc_p / (128*K)));
1123
1124 for (int i = old_c1_count; i < new_c1_count; i++) {
1125 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1126 if (ct == NULL) break;
1127 _compilers[0]->set_num_compiler_threads(i + 1);
1128 if (TraceCompilerThreads) {
1129 ResourceMark rm;
1130 MutexLocker mu(Threads_lock);
1131 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
1132 ct->get_thread_name(), (int)(available_memory/M), (int)(available_cc_p/M));
1133 }
1134 }
1135 }
1136
1137 CompileThread_lock->unlock();
1138 }
1139
1140
1141 /**
1142 * Set the methods on the stack as on_stack so that redefine classes doesn't
1143 * reclaim them. This method is executed at a safepoint.
1144 */
1145 void CompileBroker::mark_on_stack() {
1146 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1147 // Since we are at a safepoint, we do not need a lock to access
1148 // the compile queues.
1149 if (_c2_compile_queue != NULL) {
1150 _c2_compile_queue->mark_on_stack();
1151 }
1152 if (_c1_compile_queue != NULL) {
1153 _c1_compile_queue->mark_on_stack();
1154 }
1155 }
1156
1157 // ------------------------------------------------------------------
1158 // CompileBroker::compile_method
1159 //
1160 // Request compilation of a method.
1161 void CompileBroker::compile_method_base(const methodHandle& method,
1162 int osr_bci,
1163 int comp_level,
1164 const methodHandle& hot_method,
1165 int hot_count,
1166 CompileTask::CompileReason compile_reason,
1167 bool blocking,
1168 Thread* thread) {
1169 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1170 assert(method->method_holder()->is_instance_klass(),
1171 "sanity check");
1172 assert(!method->method_holder()->is_not_initialized(),
1173 "method holder must be initialized");
1174 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1175
1176 if (CIPrintRequests) {
1177 tty->print("request: ");
1178 method->print_short_name(tty);
1179 if (osr_bci != InvocationEntryBci) {
1180 tty->print(" osr_bci: %d", osr_bci);
1181 }
1182 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1183 if (!hot_method.is_null()) {
1184 tty->print(" hot: ");
1185 if (hot_method() != method()) {
1186 hot_method->print_short_name(tty);
1187 } else {
1188 tty->print("yes");
1189 }
1190 }
1191 tty->cr();
1192 }
1193
1194 // A request has been made for compilation. Before we do any
1195 // real work, check to see if the method has been compiled
1196 // in the meantime with a definitive result.
1197 if (compilation_is_complete(method, osr_bci, comp_level)) {
1198 return;
1199 }
1200
1201 #ifndef PRODUCT
1202 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1203 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1204 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1205 return;
1206 }
1207 }
1208 #endif
1209
1210 // If this method is already in the compile queue, then
1211 // we do not block the current thread.
1212 if (compilation_is_in_queue(method)) {
1213 // We may want to decay our counter a bit here to prevent
1214 // multiple denied requests for compilation. This is an
1215 // open compilation policy issue. Note: The other possibility,
1216 // in the case that this is a blocking compile request, is to have
1217 // all subsequent blocking requesters wait for completion of
1218 // ongoing compiles. Note that in this case we'll need a protocol
1219 // for freeing the associated compile tasks. [Or we could have
1220 // a single static monitor on which all these waiters sleep.]
1221 return;
1222 }
1223
1224 if (TieredCompilation) {
1225 // Tiered policy requires MethodCounters to exist before adding a method to
1226 // the queue. Create if we don't have them yet.
1227 method->get_method_counters(thread);
1228 }
1229
1230 // Outputs from the following MutexLocker block:
1231 CompileTask* task = NULL;
1232 CompileQueue* queue = compile_queue(comp_level);
1233
1234 // Acquire our lock.
1235 {
1236 MutexLocker locker(thread, MethodCompileQueue_lock);
1237
1238 // Make sure the method has not slipped into the queues since
1239 // last we checked; note that those checks were "fast bail-outs".
1240 // Here we need to be more careful, see 14012000 below.
1241 if (compilation_is_in_queue(method)) {
1242 return;
1243 }
1244
1245 // We need to check again to see if the compilation has
1246 // completed. A previous compilation may have registered
1247 // some result.
1248 if (compilation_is_complete(method, osr_bci, comp_level)) {
1249 return;
1250 }
1251
1252 // We now know that this compilation is not pending, complete,
1253 // or prohibited. Assign a compile_id to this compilation
1254 // and check to see if it is in our [Start..Stop) range.
1255 int compile_id = assign_compile_id(method, osr_bci);
1256 if (compile_id == 0) {
1257 // The compilation falls outside the allowed range.
1258 return;
1259 }
1260
1261 #if INCLUDE_JVMCI
1262 if (UseJVMCICompiler && blocking) {
1263 // Don't allow blocking compiles for requests triggered by JVMCI.
1264 if (thread->is_Compiler_thread()) {
1265 blocking = false;
1266 }
1267
1268 if (!UseJVMCINativeLibrary) {
1269 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1270 vframeStream vfst((JavaThread*) thread);
1271 for (; !vfst.at_end(); vfst.next()) {
1272 if (vfst.method()->is_static_initializer() ||
1273 (vfst.method()->method_holder()->is_subclass_of(SystemDictionary::ClassLoader_klass()) &&
1274 vfst.method()->name() == vmSymbols::loadClass_name())) {
1275 blocking = false;
1276 break;
1277 }
1278 }
1279 }
1280
1281 // Don't allow blocking compilation requests to JVMCI
1282 // if JVMCI itself is not yet initialized
1283 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1284 blocking = false;
1285 }
1286
1287 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1288 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1289 // such as the DestroyJavaVM thread.
1290 if (JVMCI::in_shutdown()) {
1291 blocking = false;
1292 }
1293 }
1294 #endif // INCLUDE_JVMCI
1295
1296 // We will enter the compilation in the queue.
1297 // 14012000: Note that this sets the queued_for_compile bits in
1298 // the target method. We can now reason that a method cannot be
1299 // queued for compilation more than once, as follows:
1300 // Before a thread queues a task for compilation, it first acquires
1301 // the compile queue lock, then checks if the method's queued bits
1302 // are set or it has already been compiled. Thus there can not be two
1303 // instances of a compilation task for the same method on the
1304 // compilation queue. Consider now the case where the compilation
1305 // thread has already removed a task for that method from the queue
1306 // and is in the midst of compiling it. In this case, the
1307 // queued_for_compile bits must be set in the method (and these
1308 // will be visible to the current thread, since the bits were set
1309 // under protection of the compile queue lock, which we hold now.
1310 // When the compilation completes, the compiler thread first sets
1311 // the compilation result and then clears the queued_for_compile
1312 // bits. Neither of these actions are protected by a barrier (or done
1313 // under the protection of a lock), so the only guarantee we have
1314 // (on machines with TSO (Total Store Order)) is that these values
1315 // will update in that order. As a result, the only combinations of
1316 // these bits that the current thread will see are, in temporal order:
1317 // <RESULT, QUEUE> :
1318 // <0, 1> : in compile queue, but not yet compiled
1319 // <1, 1> : compiled but queue bit not cleared
1320 // <1, 0> : compiled and queue bit cleared
1321 // Because we first check the queue bits then check the result bits,
1322 // we are assured that we cannot introduce a duplicate task.
1323 // Note that if we did the tests in the reverse order (i.e. check
1324 // result then check queued bit), we could get the result bit before
1325 // the compilation completed, and the queue bit after the compilation
1326 // completed, and end up introducing a "duplicate" (redundant) task.
1327 // In that case, the compiler thread should first check if a method
1328 // has already been compiled before trying to compile it.
1329 // NOTE: in the event that there are multiple compiler threads and
1330 // there is de-optimization/recompilation, things will get hairy,
1331 // and in that case it's best to protect both the testing (here) of
1332 // these bits, and their updating (here and elsewhere) under a
1333 // common lock.
1334 task = create_compile_task(queue,
1335 compile_id, method,
1336 osr_bci, comp_level,
1337 hot_method, hot_count, compile_reason,
1338 blocking);
1339 }
1340
1341 if (blocking) {
1342 wait_for_completion(task);
1343 }
1344 }
1345
1346 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1347 int comp_level,
1348 const methodHandle& hot_method, int hot_count,
1349 CompileTask::CompileReason compile_reason,
1350 Thread* THREAD) {
1351 // Do nothing if compilebroker is not initalized or compiles are submitted on level none
1352 if (!_initialized || comp_level == CompLevel_none) {
1353 return NULL;
1354 }
1355
1356 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1357 assert(comp != NULL, "Ensure we have a compiler");
1358
1359 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1360 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1361 DirectivesStack::release(directive);
1362 return nm;
1363 }
1364
1365 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1366 int comp_level,
1367 const methodHandle& hot_method, int hot_count,
1368 CompileTask::CompileReason compile_reason,
1369 DirectiveSet* directive,
1370 Thread* THREAD) {
1371
1372 // make sure arguments make sense
1373 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1374 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1375 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1376 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1377 assert(!TieredCompilation || comp_level <= TieredStopAtLevel, "Invalid compilation level");
1378 // allow any levels for WhiteBox
1379 assert(WhiteBoxAPI || TieredCompilation || comp_level == CompLevel_highest_tier, "only CompLevel_highest_tier must be used in non-tiered");
1380 // return quickly if possible
1381
1382 // lock, make sure that the compilation
1383 // isn't prohibited in a straightforward way.
1384 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1385 if (comp == NULL || !comp->can_compile_method(method) ||
1386 compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1387 return NULL;
1388 }
1389
1390 #if INCLUDE_JVMCI
1391 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1392 return NULL;
1393 }
1394 #endif
1395
1396 if (osr_bci == InvocationEntryBci) {
1397 // standard compilation
1398 CompiledMethod* method_code = method->code();
1399 if (method_code != NULL && method_code->is_nmethod()) {
1400 if (compilation_is_complete(method, osr_bci, comp_level)) {
1401 return (nmethod*) method_code;
1402 }
1403 }
1404 if (method->is_not_compilable(comp_level)) {
1405 return NULL;
1406 }
1407 } else {
1408 // osr compilation
1409 #ifndef TIERED
1410 // seems like an assert of dubious value
1411 assert(comp_level == CompLevel_highest_tier,
1412 "all OSR compiles are assumed to be at a single compilation level");
1413 #endif // TIERED
1414 // We accept a higher level osr method
1415 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1416 if (nm != NULL) return nm;
1417 if (method->is_not_osr_compilable(comp_level)) return NULL;
1418 }
1419
1420 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1421 // some prerequisites that are compiler specific
1422 if (comp->is_c2()) {
1423 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NULL);
1424 // Resolve all classes seen in the signature of the method
1425 // we are compiling.
1426 Method::load_signature_classes(method, CHECK_AND_CLEAR_NULL);
1427 }
1428
1429 // If the method is native, do the lookup in the thread requesting
1430 // the compilation. Native lookups can load code, which is not
1431 // permitted during compilation.
1432 //
1433 // Note: A native method implies non-osr compilation which is
1434 // checked with an assertion at the entry of this method.
1435 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1436 bool in_base_library;
1437 address adr = NativeLookup::lookup(method, in_base_library, THREAD);
1438 if (HAS_PENDING_EXCEPTION) {
1439 // In case of an exception looking up the method, we just forget
1440 // about it. The interpreter will kick-in and throw the exception.
1441 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1442 CLEAR_PENDING_EXCEPTION;
1443 return NULL;
1444 }
1445 assert(method->has_native_function(), "must have native code by now");
1446 }
1447
1448 // RedefineClasses() has replaced this method; just return
1449 if (method->is_old()) {
1450 return NULL;
1451 }
1452
1453 // JVMTI -- post_compile_event requires jmethod_id() that may require
1454 // a lock the compiling thread can not acquire. Prefetch it here.
1455 if (JvmtiExport::should_post_compiled_method_load()) {
1456 method->jmethod_id();
1457 }
1458
1459 // do the compilation
1460 if (method->is_native()) {
1461 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1462 #if defined(X86) && !defined(ZERO)
1463 // The following native methods:
1464 //
1465 // java.lang.Float.intBitsToFloat
1466 // java.lang.Float.floatToRawIntBits
1467 // java.lang.Double.longBitsToDouble
1468 // java.lang.Double.doubleToRawLongBits
1469 //
1470 // are called through the interpreter even if interpreter native stubs
1471 // are not preferred (i.e., calling through adapter handlers is preferred).
1472 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1473 // if the version of the methods from the native libraries is called.
1474 // As the interpreter and the C2-intrinsified version of the methods preserves
1475 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1476 if ((UseSSE >= 1 &&
1477 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1478 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1479 (UseSSE >= 2 &&
1480 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1481 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1482 return NULL;
1483 }
1484 #endif // X86 && !ZERO
1485
1486 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1487 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1488 //
1489 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1490 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1491 AdapterHandlerLibrary::create_native_wrapper(method);
1492 } else {
1493 return NULL;
1494 }
1495 } else {
1496 // If the compiler is shut off due to code cache getting full
1497 // fail out now so blocking compiles dont hang the java thread
1498 if (!should_compile_new_jobs()) {
1499 CompilationPolicy::policy()->delay_compilation(method());
1500 return NULL;
1501 }
1502 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1503 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1504 }
1505
1506 // return requested nmethod
1507 // We accept a higher level osr method
1508 if (osr_bci == InvocationEntryBci) {
1509 CompiledMethod* code = method->code();
1510 if (code == NULL) {
1511 return (nmethod*) code;
1512 } else {
1513 return code->as_nmethod_or_null();
1514 }
1515 }
1516 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1517 }
1518
1519
1520 // ------------------------------------------------------------------
1521 // CompileBroker::compilation_is_complete
1522 //
1523 // See if compilation of this method is already complete.
1524 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1525 int osr_bci,
1526 int comp_level) {
1527 bool is_osr = (osr_bci != standard_entry_bci);
1528 if (is_osr) {
1529 if (method->is_not_osr_compilable(comp_level)) {
1530 return true;
1531 } else {
1532 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1533 return (result != NULL);
1534 }
1535 } else {
1536 if (method->is_not_compilable(comp_level)) {
1537 return true;
1538 } else {
1539 CompiledMethod* result = method->code();
1540 if (result == NULL) return false;
1541 return comp_level == result->comp_level();
1542 }
1543 }
1544 }
1545
1546
1547 /**
1548 * See if this compilation is already requested.
1549 *
1550 * Implementation note: there is only a single "is in queue" bit
1551 * for each method. This means that the check below is overly
1552 * conservative in the sense that an osr compilation in the queue
1553 * will block a normal compilation from entering the queue (and vice
1554 * versa). This can be remedied by a full queue search to disambiguate
1555 * cases. If it is deemed profitable, this may be done.
1556 */
1557 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1558 return method->queued_for_compilation();
1559 }
1560
1561 // ------------------------------------------------------------------
1562 // CompileBroker::compilation_is_prohibited
1563 //
1564 // See if this compilation is not allowed.
1565 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1566 bool is_native = method->is_native();
1567 // Some compilers may not support the compilation of natives.
1568 AbstractCompiler *comp = compiler(comp_level);
1569 if (is_native &&
1570 (!CICompileNatives || comp == NULL || !comp->supports_native())) {
1571 method->set_not_compilable_quietly("native methods not supported", comp_level);
1572 return true;
1573 }
1574
1575 bool is_osr = (osr_bci != standard_entry_bci);
1576 // Some compilers may not support on stack replacement.
1577 if (is_osr &&
1578 (!CICompileOSR || comp == NULL || !comp->supports_osr())) {
1579 method->set_not_osr_compilable("OSR not supported", comp_level);
1580 return true;
1581 }
1582
1583 // The method may be explicitly excluded by the user.
1584 double scale;
1585 if (excluded || (CompilerOracle::has_option_value(method, "CompileThresholdScaling", scale) && scale == 0)) {
1586 bool quietly = CompilerOracle::should_exclude_quietly();
1587 if (PrintCompilation && !quietly) {
1588 // This does not happen quietly...
1589 ResourceMark rm;
1590 tty->print("### Excluding %s:%s",
1591 method->is_native() ? "generation of native wrapper" : "compile",
1592 (method->is_static() ? " static" : ""));
1593 method->print_short_name(tty);
1594 tty->cr();
1595 }
1596 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1597 }
1598
1599 return false;
1600 }
1601
1602 /**
1603 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1604 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1605 * The function also allows to generate separate compilation IDs for OSR compilations.
1606 */
1607 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1608 #ifdef ASSERT
1609 bool is_osr = (osr_bci != standard_entry_bci);
1610 int id;
1611 if (method->is_native()) {
1612 assert(!is_osr, "can't be osr");
1613 // Adapters, native wrappers and method handle intrinsics
1614 // should be generated always.
1615 return Atomic::add(&_compilation_id, 1);
1616 } else if (CICountOSR && is_osr) {
1617 id = Atomic::add(&_osr_compilation_id, 1);
1618 if (CIStartOSR <= id && id < CIStopOSR) {
1619 return id;
1620 }
1621 } else {
1622 id = Atomic::add(&_compilation_id, 1);
1623 if (CIStart <= id && id < CIStop) {
1624 return id;
1625 }
1626 }
1627
1628 // Method was not in the appropriate compilation range.
1629 method->set_not_compilable_quietly("Not in requested compile id range");
1630 return 0;
1631 #else
1632 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1633 // only _compilation_id is incremented.
1634 return Atomic::add(&_compilation_id, 1);
1635 #endif
1636 }
1637
1638 // ------------------------------------------------------------------
1639 // CompileBroker::assign_compile_id_unlocked
1640 //
1641 // Public wrapper for assign_compile_id that acquires the needed locks
1642 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1643 MutexLocker locker(thread, MethodCompileQueue_lock);
1644 return assign_compile_id(method, osr_bci);
1645 }
1646
1647 // ------------------------------------------------------------------
1648 // CompileBroker::create_compile_task
1649 //
1650 // Create a CompileTask object representing the current request for
1651 // compilation. Add this task to the queue.
1652 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1653 int compile_id,
1654 const methodHandle& method,
1655 int osr_bci,
1656 int comp_level,
1657 const methodHandle& hot_method,
1658 int hot_count,
1659 CompileTask::CompileReason compile_reason,
1660 bool blocking) {
1661 CompileTask* new_task = CompileTask::allocate();
1662 new_task->initialize(compile_id, method, osr_bci, comp_level,
1663 hot_method, hot_count, compile_reason,
1664 blocking);
1665 queue->add(new_task);
1666 return new_task;
1667 }
1668
1669 #if INCLUDE_JVMCI
1670 // The number of milliseconds to wait before checking if
1671 // JVMCI compilation has made progress.
1672 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1673
1674 // The number of JVMCI compilation progress checks that must fail
1675 // before unblocking a thread waiting for a blocking compilation.
1676 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1677
1678 /**
1679 * Waits for a JVMCI compiler to complete a given task. This thread
1680 * waits until either the task completes or it sees no JVMCI compilation
1681 * progress for N consecutive milliseconds where N is
1682 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1683 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1684 *
1685 * @return true if this thread needs to free/recycle the task
1686 */
1687 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1688 MonitorLocker ml(thread, task->lock());
1689 int progress_wait_attempts = 0;
1690 int methods_compiled = jvmci->methods_compiled();
1691 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1692 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1693 CompilerThread* jvmci_compiler_thread = task->jvmci_compiler_thread();
1694
1695 bool progress;
1696 if (jvmci_compiler_thread != NULL) {
1697 // If the JVMCI compiler thread is not blocked or suspended, we deem it to be making progress.
1698 progress = jvmci_compiler_thread->thread_state() != _thread_blocked &&
1699 !jvmci_compiler_thread->is_external_suspend();
1700 } else {
1701 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1702 // that all JVMCI compiler threads are blocked on. We use the counter for
1703 // successful JVMCI compilations to determine whether JVMCI compilation
1704 // is still making progress through the JVMCI compiler queue.
1705 progress = jvmci->methods_compiled() != methods_compiled;
1706 }
1707
1708 if (!progress) {
1709 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1710 if (PrintCompilation) {
1711 task->print(tty, "wait for blocking compilation timed out");
1712 }
1713 break;
1714 }
1715 } else {
1716 progress_wait_attempts = 0;
1717 if (jvmci_compiler_thread == NULL) {
1718 methods_compiled = jvmci->methods_compiled();
1719 }
1720 }
1721 }
1722 task->clear_waiter();
1723 return task->is_complete();
1724 }
1725 #endif
1726
1727 /**
1728 * Wait for the compilation task to complete.
1729 */
1730 void CompileBroker::wait_for_completion(CompileTask* task) {
1731 if (CIPrintCompileQueue) {
1732 ttyLocker ttyl;
1733 tty->print_cr("BLOCKING FOR COMPILE");
1734 }
1735
1736 assert(task->is_blocking(), "can only wait on blocking task");
1737
1738 JavaThread* thread = JavaThread::current();
1739
1740 methodHandle method(thread, task->method());
1741 bool free_task;
1742 #if INCLUDE_JVMCI
1743 AbstractCompiler* comp = compiler(task->comp_level());
1744 if (!UseJVMCINativeLibrary && comp->is_jvmci() && !task->should_wait_for_compilation()) {
1745 // It may return before compilation is completed.
1746 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1747 } else
1748 #endif
1749 {
1750 MonitorLocker ml(thread, task->lock());
1751 free_task = true;
1752 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1753 ml.wait();
1754 }
1755 }
1756
1757 if (free_task) {
1758 if (is_compilation_disabled_forever()) {
1759 CompileTask::free(task);
1760 return;
1761 }
1762
1763 // It is harmless to check this status without the lock, because
1764 // completion is a stable property (until the task object is recycled).
1765 assert(task->is_complete(), "Compilation should have completed");
1766 assert(task->code_handle() == NULL, "must be reset");
1767
1768 // By convention, the waiter is responsible for recycling a
1769 // blocking CompileTask. Since there is only one waiter ever
1770 // waiting on a CompileTask, we know that no one else will
1771 // be using this CompileTask; we can free it.
1772 CompileTask::free(task);
1773 }
1774 }
1775
1776 /**
1777 * Initialize compiler thread(s) + compiler object(s). The postcondition
1778 * of this function is that the compiler runtimes are initialized and that
1779 * compiler threads can start compiling.
1780 */
1781 bool CompileBroker::init_compiler_runtime() {
1782 CompilerThread* thread = CompilerThread::current();
1783 AbstractCompiler* comp = thread->compiler();
1784 // Final sanity check - the compiler object must exist
1785 guarantee(comp != NULL, "Compiler object must exist");
1786
1787 {
1788 // Must switch to native to allocate ci_env
1789 ThreadToNativeFromVM ttn(thread);
1790 ciEnv ci_env((CompileTask*)NULL);
1791 // Cache Jvmti state
1792 ci_env.cache_jvmti_state();
1793 // Cache DTrace flags
1794 ci_env.cache_dtrace_flags();
1795
1796 // Switch back to VM state to do compiler initialization
1797 ThreadInVMfromNative tv(thread);
1798 ResetNoHandleMark rnhm;
1799
1800 // Perform per-thread and global initializations
1801 comp->initialize();
1802 }
1803
1804 if (comp->is_failed()) {
1805 disable_compilation_forever();
1806 // If compiler initialization failed, no compiler thread that is specific to a
1807 // particular compiler runtime will ever start to compile methods.
1808 shutdown_compiler_runtime(comp, thread);
1809 return false;
1810 }
1811
1812 // C1 specific check
1813 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1814 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1815 return false;
1816 }
1817
1818 return true;
1819 }
1820
1821 /**
1822 * If C1 and/or C2 initialization failed, we shut down all compilation.
1823 * We do this to keep things simple. This can be changed if it ever turns
1824 * out to be a problem.
1825 */
1826 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1827 // Free buffer blob, if allocated
1828 if (thread->get_buffer_blob() != NULL) {
1829 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1830 CodeCache::free(thread->get_buffer_blob());
1831 }
1832
1833 if (comp->should_perform_shutdown()) {
1834 // There are two reasons for shutting down the compiler
1835 // 1) compiler runtime initialization failed
1836 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1837 warning("%s initialization failed. Shutting down all compilers", comp->name());
1838
1839 // Only one thread per compiler runtime object enters here
1840 // Set state to shut down
1841 comp->set_shut_down();
1842
1843 // Delete all queued compilation tasks to make compiler threads exit faster.
1844 if (_c1_compile_queue != NULL) {
1845 _c1_compile_queue->free_all();
1846 }
1847
1848 if (_c2_compile_queue != NULL) {
1849 _c2_compile_queue->free_all();
1850 }
1851
1852 // Set flags so that we continue execution with using interpreter only.
1853 UseCompiler = false;
1854 UseInterpreter = true;
1855
1856 // We could delete compiler runtimes also. However, there are references to
1857 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1858 // fail. This can be done later if necessary.
1859 }
1860 }
1861
1862 /**
1863 * Helper function to create new or reuse old CompileLog.
1864 */
1865 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1866 if (!LogCompilation) return NULL;
1867
1868 AbstractCompiler *compiler = ct->compiler();
1869 bool c1 = compiler->is_c1();
1870 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1871 assert(compiler_objects != NULL, "must be initialized at this point");
1872 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1873 assert(logs != NULL, "must be initialized at this point");
1874 int count = c1 ? _c1_count : _c2_count;
1875
1876 // Find Compiler number by its threadObj.
1877 oop compiler_obj = ct->threadObj();
1878 int compiler_number = 0;
1879 bool found = false;
1880 for (; compiler_number < count; compiler_number++) {
1881 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1882 found = true;
1883 break;
1884 }
1885 }
1886 assert(found, "Compiler must exist at this point");
1887
1888 // Determine pointer for this thread's log.
1889 CompileLog** log_ptr = &logs[compiler_number];
1890
1891 // Return old one if it exists.
1892 CompileLog* log = *log_ptr;
1893 if (log != NULL) {
1894 ct->init_log(log);
1895 return log;
1896 }
1897
1898 // Create a new one and remember it.
1899 init_compiler_thread_log();
1900 log = ct->log();
1901 *log_ptr = log;
1902 return log;
1903 }
1904
1905 // ------------------------------------------------------------------
1906 // CompileBroker::compiler_thread_loop
1907 //
1908 // The main loop run by a CompilerThread.
1909 void CompileBroker::compiler_thread_loop() {
1910 CompilerThread* thread = CompilerThread::current();
1911 CompileQueue* queue = thread->queue();
1912 // For the thread that initializes the ciObjectFactory
1913 // this resource mark holds all the shared objects
1914 ResourceMark rm;
1915
1916 // First thread to get here will initialize the compiler interface
1917
1918 {
1919 ASSERT_IN_VM;
1920 MutexLocker only_one (thread, CompileThread_lock);
1921 if (!ciObjectFactory::is_initialized()) {
1922 ciObjectFactory::initialize();
1923 }
1924 }
1925
1926 // Open a log.
1927 CompileLog* log = get_log(thread);
1928 if (log != NULL) {
1929 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1930 thread->name(),
1931 os::current_thread_id(),
1932 os::current_process_id());
1933 log->stamp();
1934 log->end_elem();
1935 }
1936
1937 // If compiler thread/runtime initialization fails, exit the compiler thread
1938 if (!init_compiler_runtime()) {
1939 return;
1940 }
1941
1942 thread->start_idle_timer();
1943
1944 // Poll for new compilation tasks as long as the JVM runs. Compilation
1945 // should only be disabled if something went wrong while initializing the
1946 // compiler runtimes. This, in turn, should not happen. The only known case
1947 // when compiler runtime initialization fails is if there is not enough free
1948 // space in the code cache to generate the necessary stubs, etc.
1949 while (!is_compilation_disabled_forever()) {
1950 // We need this HandleMark to avoid leaking VM handles.
1951 HandleMark hm(thread);
1952
1953 CompileTask* task = queue->get();
1954 if (task == NULL) {
1955 if (UseDynamicNumberOfCompilerThreads) {
1956 // Access compiler_count under lock to enforce consistency.
1957 MutexLocker only_one(CompileThread_lock);
1958 if (can_remove(thread, true)) {
1959 if (TraceCompilerThreads) {
1960 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1961 thread->name(), thread->idle_time_millis());
1962 }
1963 // Free buffer blob, if allocated
1964 if (thread->get_buffer_blob() != NULL) {
1965 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1966 CodeCache::free(thread->get_buffer_blob());
1967 }
1968 return; // Stop this thread.
1969 }
1970 }
1971 } else {
1972 // Assign the task to the current thread. Mark this compilation
1973 // thread as active for the profiler.
1974 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1975 // occurs after fetching the compile task off the queue.
1976 CompileTaskWrapper ctw(task);
1977 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1978 task->set_code_handle(&result_handle);
1979 methodHandle method(thread, task->method());
1980
1981 // Never compile a method if breakpoints are present in it
1982 if (method()->number_of_breakpoints() == 0) {
1983 // Compile the method.
1984 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1985 invoke_compiler_on_method(task);
1986 thread->start_idle_timer();
1987 } else {
1988 // After compilation is disabled, remove remaining methods from queue
1989 method->clear_queued_for_compilation();
1990 task->set_failure_reason("compilation is disabled");
1991 }
1992 }
1993
1994 if (UseDynamicNumberOfCompilerThreads) {
1995 possibly_add_compiler_threads(thread);
1996 assert(!thread->has_pending_exception(), "should have been handled");
1997 }
1998 }
1999 }
2000
2001 // Shut down compiler runtime
2002 shutdown_compiler_runtime(thread->compiler(), thread);
2003 }
2004
2005 // ------------------------------------------------------------------
2006 // CompileBroker::init_compiler_thread_log
2007 //
2008 // Set up state required by +LogCompilation.
2009 void CompileBroker::init_compiler_thread_log() {
2010 CompilerThread* thread = CompilerThread::current();
2011 char file_name[4*K];
2012 FILE* fp = NULL;
2013 intx thread_id = os::current_thread_id();
2014 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
2015 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
2016 if (dir == NULL) {
2017 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
2018 thread_id, os::current_process_id());
2019 } else {
2020 jio_snprintf(file_name, sizeof(file_name),
2021 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
2022 os::file_separator(), thread_id, os::current_process_id());
2023 }
2024
2025 fp = fopen(file_name, "wt");
2026 if (fp != NULL) {
2027 if (LogCompilation && Verbose) {
2028 tty->print_cr("Opening compilation log %s", file_name);
2029 }
2030 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
2031 if (log == NULL) {
2032 fclose(fp);
2033 return;
2034 }
2035 thread->init_log(log);
2036
2037 if (xtty != NULL) {
2038 ttyLocker ttyl;
2039 // Record any per thread log files
2040 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2041 }
2042 return;
2043 }
2044 }
2045 warning("Cannot open log file: %s", file_name);
2046 }
2047
2048 void CompileBroker::log_metaspace_failure() {
2049 const char* message = "some methods may not be compiled because metaspace "
2050 "is out of memory";
2051 if (_compilation_log != NULL) {
2052 _compilation_log->log_metaspace_failure(message);
2053 }
2054 if (PrintCompilation) {
2055 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2056 }
2057 }
2058
2059
2060 // ------------------------------------------------------------------
2061 // CompileBroker::set_should_block
2062 //
2063 // Set _should_block.
2064 // Call this from the VM, with Threads_lock held and a safepoint requested.
2065 void CompileBroker::set_should_block() {
2066 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2067 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2068 #ifndef PRODUCT
2069 if (PrintCompilation && (Verbose || WizardMode))
2070 tty->print_cr("notifying compiler thread pool to block");
2071 #endif
2072 _should_block = true;
2073 }
2074
2075 // ------------------------------------------------------------------
2076 // CompileBroker::maybe_block
2077 //
2078 // Call this from the compiler at convenient points, to poll for _should_block.
2079 void CompileBroker::maybe_block() {
2080 if (_should_block) {
2081 #ifndef PRODUCT
2082 if (PrintCompilation && (Verbose || WizardMode))
2083 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2084 #endif
2085 ThreadInVMfromNative tivfn(JavaThread::current());
2086 }
2087 }
2088
2089 // wrapper for CodeCache::print_summary()
2090 static void codecache_print(bool detailed)
2091 {
2092 ResourceMark rm;
2093 stringStream s;
2094 // Dump code cache into a buffer before locking the tty,
2095 {
2096 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2097 CodeCache::print_summary(&s, detailed);
2098 }
2099 ttyLocker ttyl;
2100 tty->print("%s", s.as_string());
2101 }
2102
2103 // wrapper for CodeCache::print_summary() using outputStream
2104 static void codecache_print(outputStream* out, bool detailed) {
2105 ResourceMark rm;
2106 stringStream s;
2107
2108 // Dump code cache into a buffer
2109 {
2110 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2111 CodeCache::print_summary(&s, detailed);
2112 }
2113
2114 char* remaining_log = s.as_string();
2115 while (*remaining_log != '\0') {
2116 char* eol = strchr(remaining_log, '\n');
2117 if (eol == NULL) {
2118 out->print_cr("%s", remaining_log);
2119 remaining_log = remaining_log + strlen(remaining_log);
2120 } else {
2121 *eol = '\0';
2122 out->print_cr("%s", remaining_log);
2123 remaining_log = eol + 1;
2124 }
2125 }
2126 }
2127
2128 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env,
2129 int compilable, const char* failure_reason) {
2130 if (success) {
2131 task->mark_success();
2132 if (ci_env != NULL) {
2133 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
2134 }
2135 if (_compilation_log != NULL) {
2136 nmethod* code = task->code();
2137 if (code != NULL) {
2138 _compilation_log->log_nmethod(thread, code);
2139 }
2140 }
2141 } else if (AbortVMOnCompilationFailure) {
2142 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2143 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2144 }
2145 if (compilable == ciEnv::MethodCompilable_never) {
2146 fatal("Never compilable: %s", failure_reason);
2147 }
2148 }
2149 // simulate crash during compilation
2150 assert(task->compile_id() != CICrashAt, "just as planned");
2151 }
2152
2153 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2154 assert(task != NULL, "invariant");
2155 CompilerEvent::CompilationEvent::post(event,
2156 task->compile_id(),
2157 task->compiler()->type(),
2158 task->method(),
2159 task->comp_level(),
2160 task->is_success(),
2161 task->osr_bci() != CompileBroker::standard_entry_bci,
2162 (task->code() == NULL) ? 0 : task->code()->total_size(),
2163 task->num_inlined_bytecodes());
2164 }
2165
2166 int DirectivesStack::_depth = 0;
2167 CompilerDirectives* DirectivesStack::_top = NULL;
2168 CompilerDirectives* DirectivesStack::_bottom = NULL;
2169
2170 // ------------------------------------------------------------------
2171 // CompileBroker::invoke_compiler_on_method
2172 //
2173 // Compile a method.
2174 //
2175 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2176 task->print_ul();
2177 if (PrintCompilation) {
2178 ResourceMark rm;
2179 task->print_tty();
2180 }
2181 elapsedTimer time;
2182
2183 CompilerThread* thread = CompilerThread::current();
2184 ResourceMark rm(thread);
2185
2186 if (LogEvents) {
2187 _compilation_log->log_compile(thread, task);
2188 }
2189
2190 // Common flags.
2191 uint compile_id = task->compile_id();
2192 int osr_bci = task->osr_bci();
2193 bool is_osr = (osr_bci != standard_entry_bci);
2194 bool should_log = (thread->log() != NULL);
2195 bool should_break = false;
2196 const int task_level = task->comp_level();
2197 AbstractCompiler* comp = task->compiler();
2198
2199 DirectiveSet* directive;
2200 {
2201 // create the handle inside it's own block so it can't
2202 // accidentally be referenced once the thread transitions to
2203 // native. The NoHandleMark before the transition should catch
2204 // any cases where this occurs in the future.
2205 methodHandle method(thread, task->method());
2206 assert(!method->is_native(), "no longer compile natives");
2207
2208 // Look up matching directives
2209 directive = DirectivesStack::getMatchingDirective(method, comp);
2210
2211 // Update compile information when using perfdata.
2212 if (UsePerfData) {
2213 update_compile_perf_data(thread, method, is_osr);
2214 }
2215
2216 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2217 }
2218
2219 should_break = directive->BreakAtExecuteOption || task->check_break_at_flags();
2220 if (should_log && !directive->LogOption) {
2221 should_log = false;
2222 }
2223
2224 // Allocate a new set of JNI handles.
2225 push_jni_handle_block();
2226 Method* target_handle = task->method();
2227 int compilable = ciEnv::MethodCompilable;
2228 const char* failure_reason = NULL;
2229 bool failure_reason_on_C_heap = false;
2230 const char* retry_message = NULL;
2231
2232 #if INCLUDE_JVMCI
2233 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2234 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2235
2236 TraceTime t1("compilation", &time);
2237 EventCompilation event;
2238 JVMCICompileState compile_state(task);
2239 JVMCIRuntime *runtime = NULL;
2240
2241 if (JVMCI::in_shutdown()) {
2242 failure_reason = "in JVMCI shutdown";
2243 retry_message = "not retryable";
2244 compilable = ciEnv::MethodCompilable_never;
2245 } else if (compile_state.target_method_is_old()) {
2246 // Skip redefined methods
2247 failure_reason = "redefined method";
2248 retry_message = "not retryable";
2249 compilable = ciEnv::MethodCompilable_never;
2250 } else {
2251 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2252 methodHandle method(thread, target_handle);
2253 runtime = env.runtime();
2254 runtime->compile_method(&env, jvmci, method, osr_bci);
2255
2256 failure_reason = compile_state.failure_reason();
2257 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2258 if (!compile_state.retryable()) {
2259 retry_message = "not retryable";
2260 compilable = ciEnv::MethodCompilable_not_at_tier;
2261 }
2262 if (task->code() == NULL) {
2263 assert(failure_reason != NULL, "must specify failure_reason");
2264 }
2265 }
2266 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason);
2267 if (event.should_commit()) {
2268 post_compilation_event(event, task);
2269 }
2270
2271 } else
2272 #endif // INCLUDE_JVMCI
2273 {
2274 NoHandleMark nhm;
2275 ThreadToNativeFromVM ttn(thread);
2276
2277 ciEnv ci_env(task);
2278 if (should_break) {
2279 ci_env.set_break_at_compile(true);
2280 }
2281 if (should_log) {
2282 ci_env.set_log(thread->log());
2283 }
2284 assert(thread->env() == &ci_env, "set by ci_env");
2285 // The thread-env() field is cleared in ~CompileTaskWrapper.
2286
2287 // Cache Jvmti state
2288 bool method_is_old = ci_env.cache_jvmti_state();
2289
2290 // Skip redefined methods
2291 if (method_is_old) {
2292 ci_env.record_method_not_compilable("redefined method", true);
2293 }
2294
2295 // Cache DTrace flags
2296 ci_env.cache_dtrace_flags();
2297
2298 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2299
2300 TraceTime t1("compilation", &time);
2301 EventCompilation event;
2302
2303 if (comp == NULL) {
2304 ci_env.record_method_not_compilable("no compiler", !TieredCompilation);
2305 } else if (!ci_env.failing()) {
2306 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2307 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2308 while (WhiteBox::compilation_locked) {
2309 locker.wait();
2310 }
2311 }
2312 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2313
2314 /* Repeat compilation without installing code for profiling purposes */
2315 int repeat_compilation_count = directive->RepeatCompilationOption;
2316 while (repeat_compilation_count > 0) {
2317 task->print_ul("NO CODE INSTALLED");
2318 comp->compile_method(&ci_env, target, osr_bci, false , directive);
2319 repeat_compilation_count--;
2320 }
2321 }
2322
2323 if (!ci_env.failing() && task->code() == NULL) {
2324 //assert(false, "compiler should always document failure");
2325 // The compiler elected, without comment, not to register a result.
2326 // Do not attempt further compilations of this method.
2327 ci_env.record_method_not_compilable("compile failed", !TieredCompilation);
2328 }
2329
2330 // Copy this bit to the enclosing block:
2331 compilable = ci_env.compilable();
2332
2333 if (ci_env.failing()) {
2334 failure_reason = ci_env.failure_reason();
2335 retry_message = ci_env.retry_message();
2336 ci_env.report_failure(failure_reason);
2337 }
2338
2339 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason);
2340 if (event.should_commit()) {
2341 post_compilation_event(event, task);
2342 }
2343 }
2344 // Remove the JNI handle block after the ciEnv destructor has run in
2345 // the previous block.
2346 pop_jni_handle_block();
2347
2348 if (failure_reason != NULL) {
2349 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2350 if (_compilation_log != NULL) {
2351 _compilation_log->log_failure(thread, task, failure_reason, retry_message);
2352 }
2353 if (PrintCompilation) {
2354 FormatBufferResource msg = retry_message != NULL ?
2355 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2356 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2357 task->print(tty, msg);
2358 }
2359 }
2360
2361 methodHandle method(thread, task->method());
2362
2363 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2364
2365 collect_statistics(thread, time, task);
2366
2367 nmethod* nm = task->code();
2368 if (nm != NULL) {
2369 nm->maybe_print_nmethod(directive);
2370 }
2371 DirectivesStack::release(directive);
2372
2373 if (PrintCompilation && PrintCompilation2) {
2374 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2375 tty->print("%4d ", compile_id); // print compilation number
2376 tty->print("%s ", (is_osr ? "%" : " "));
2377 if (task->code() != NULL) {
2378 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2379 }
2380 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2381 }
2382
2383 Log(compilation, codecache) log;
2384 if (log.is_debug()) {
2385 LogStream ls(log.debug());
2386 codecache_print(&ls, /* detailed= */ false);
2387 }
2388 if (PrintCodeCacheOnCompilation) {
2389 codecache_print(/* detailed= */ false);
2390 }
2391 // Disable compilation, if required.
2392 switch (compilable) {
2393 case ciEnv::MethodCompilable_never:
2394 if (is_osr)
2395 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2396 else
2397 method->set_not_compilable_quietly("MethodCompilable_never");
2398 break;
2399 case ciEnv::MethodCompilable_not_at_tier:
2400 if (is_osr)
2401 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2402 else
2403 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2404 break;
2405 }
2406
2407 // Note that the queued_for_compilation bits are cleared without
2408 // protection of a mutex. [They were set by the requester thread,
2409 // when adding the task to the compile queue -- at which time the
2410 // compile queue lock was held. Subsequently, we acquired the compile
2411 // queue lock to get this task off the compile queue; thus (to belabour
2412 // the point somewhat) our clearing of the bits must be occurring
2413 // only after the setting of the bits. See also 14012000 above.
2414 method->clear_queued_for_compilation();
2415 }
2416
2417 /**
2418 * The CodeCache is full. Print warning and disable compilation.
2419 * Schedule code cache cleaning so compilation can continue later.
2420 * This function needs to be called only from CodeCache::allocate(),
2421 * since we currently handle a full code cache uniformly.
2422 */
2423 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2424 UseInterpreter = true;
2425 if (UseCompiler || AlwaysCompileLoopMethods ) {
2426 if (xtty != NULL) {
2427 ResourceMark rm;
2428 stringStream s;
2429 // Dump code cache state into a buffer before locking the tty,
2430 // because log_state() will use locks causing lock conflicts.
2431 CodeCache::log_state(&s);
2432 // Lock to prevent tearing
2433 ttyLocker ttyl;
2434 xtty->begin_elem("code_cache_full");
2435 xtty->print("%s", s.as_string());
2436 xtty->stamp();
2437 xtty->end_elem();
2438 }
2439
2440 #ifndef PRODUCT
2441 if (ExitOnFullCodeCache) {
2442 codecache_print(/* detailed= */ true);
2443 before_exit(JavaThread::current());
2444 exit_globals(); // will delete tty
2445 vm_direct_exit(1);
2446 }
2447 #endif
2448 if (UseCodeCacheFlushing) {
2449 // Since code cache is full, immediately stop new compiles
2450 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2451 NMethodSweeper::log_sweep("disable_compiler");
2452 }
2453 } else {
2454 disable_compilation_forever();
2455 }
2456
2457 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2458 }
2459 }
2460
2461 // ------------------------------------------------------------------
2462 // CompileBroker::update_compile_perf_data
2463 //
2464 // Record this compilation for debugging purposes.
2465 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2466 ResourceMark rm;
2467 char* method_name = method->name()->as_C_string();
2468 char current_method[CompilerCounters::cmname_buffer_length];
2469 size_t maxLen = CompilerCounters::cmname_buffer_length;
2470
2471 const char* class_name = method->method_holder()->name()->as_C_string();
2472
2473 size_t s1len = strlen(class_name);
2474 size_t s2len = strlen(method_name);
2475
2476 // check if we need to truncate the string
2477 if (s1len + s2len + 2 > maxLen) {
2478
2479 // the strategy is to lop off the leading characters of the
2480 // class name and the trailing characters of the method name.
2481
2482 if (s2len + 2 > maxLen) {
2483 // lop of the entire class name string, let snprintf handle
2484 // truncation of the method name.
2485 class_name += s1len; // null string
2486 }
2487 else {
2488 // lop off the extra characters from the front of the class name
2489 class_name += ((s1len + s2len + 2) - maxLen);
2490 }
2491 }
2492
2493 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2494
2495 int last_compile_type = normal_compile;
2496 if (CICountOSR && is_osr) {
2497 last_compile_type = osr_compile;
2498 }
2499
2500 CompilerCounters* counters = thread->counters();
2501 counters->set_current_method(current_method);
2502 counters->set_compile_type((jlong) last_compile_type);
2503 }
2504
2505 // ------------------------------------------------------------------
2506 // CompileBroker::push_jni_handle_block
2507 //
2508 // Push on a new block of JNI handles.
2509 void CompileBroker::push_jni_handle_block() {
2510 JavaThread* thread = JavaThread::current();
2511
2512 // Allocate a new block for JNI handles.
2513 // Inlined code from jni_PushLocalFrame()
2514 JNIHandleBlock* java_handles = thread->active_handles();
2515 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2516 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2517 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2518 thread->set_active_handles(compile_handles);
2519 }
2520
2521
2522 // ------------------------------------------------------------------
2523 // CompileBroker::pop_jni_handle_block
2524 //
2525 // Pop off the current block of JNI handles.
2526 void CompileBroker::pop_jni_handle_block() {
2527 JavaThread* thread = JavaThread::current();
2528
2529 // Release our JNI handle block
2530 JNIHandleBlock* compile_handles = thread->active_handles();
2531 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2532 thread->set_active_handles(java_handles);
2533 compile_handles->set_pop_frame_link(NULL);
2534 JNIHandleBlock::release_block(compile_handles, thread); // may block
2535 }
2536
2537 // ------------------------------------------------------------------
2538 // CompileBroker::collect_statistics
2539 //
2540 // Collect statistics about the compilation.
2541
2542 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2543 bool success = task->is_success();
2544 methodHandle method (thread, task->method());
2545 uint compile_id = task->compile_id();
2546 bool is_osr = (task->osr_bci() != standard_entry_bci);
2547 nmethod* code = task->code();
2548 CompilerCounters* counters = thread->counters();
2549
2550 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2551 MutexLocker locker(CompileStatistics_lock);
2552
2553 // _perf variables are production performance counters which are
2554 // updated regardless of the setting of the CITime and CITimeEach flags
2555 //
2556
2557 // account all time, including bailouts and failures in this counter;
2558 // C1 and C2 counters are counting both successful and unsuccessful compiles
2559 _t_total_compilation.add(time);
2560
2561 if (!success) {
2562 _total_bailout_count++;
2563 if (UsePerfData) {
2564 _perf_last_failed_method->set_value(counters->current_method());
2565 _perf_last_failed_type->set_value(counters->compile_type());
2566 _perf_total_bailout_count->inc();
2567 }
2568 _t_bailedout_compilation.add(time);
2569 } else if (code == NULL) {
2570 if (UsePerfData) {
2571 _perf_last_invalidated_method->set_value(counters->current_method());
2572 _perf_last_invalidated_type->set_value(counters->compile_type());
2573 _perf_total_invalidated_count->inc();
2574 }
2575 _total_invalidated_count++;
2576 _t_invalidated_compilation.add(time);
2577 } else {
2578 // Compilation succeeded
2579
2580 // update compilation ticks - used by the implementation of
2581 // java.lang.management.CompilationMXBean
2582 _perf_total_compilation->inc(time.ticks());
2583 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2584
2585 if (CITime) {
2586 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2587 if (is_osr) {
2588 _t_osr_compilation.add(time);
2589 _sum_osr_bytes_compiled += bytes_compiled;
2590 } else {
2591 _t_standard_compilation.add(time);
2592 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2593 }
2594
2595 #if INCLUDE_JVMCI
2596 AbstractCompiler* comp = compiler(task->comp_level());
2597 if (comp) {
2598 CompilerStatistics* stats = comp->stats();
2599 if (stats) {
2600 if (is_osr) {
2601 stats->_osr.update(time, bytes_compiled);
2602 } else {
2603 stats->_standard.update(time, bytes_compiled);
2604 }
2605 stats->_nmethods_size += code->total_size();
2606 stats->_nmethods_code_size += code->insts_size();
2607 } else { // if (!stats)
2608 assert(false, "Compiler statistics object must exist");
2609 }
2610 } else { // if (!comp)
2611 assert(false, "Compiler object must exist");
2612 }
2613 #endif // INCLUDE_JVMCI
2614 }
2615
2616 if (UsePerfData) {
2617 // save the name of the last method compiled
2618 _perf_last_method->set_value(counters->current_method());
2619 _perf_last_compile_type->set_value(counters->compile_type());
2620 _perf_last_compile_size->set_value(method->code_size() +
2621 task->num_inlined_bytecodes());
2622 if (is_osr) {
2623 _perf_osr_compilation->inc(time.ticks());
2624 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2625 } else {
2626 _perf_standard_compilation->inc(time.ticks());
2627 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2628 }
2629 }
2630
2631 if (CITimeEach) {
2632 float bytes_per_sec = 1.0 * (method->code_size() + task->num_inlined_bytecodes()) / time.seconds();
2633 tty->print_cr("%3d seconds: %f bytes/sec : %f (bytes %d + %d inlined)",
2634 compile_id, time.seconds(), bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2635 }
2636
2637 // Collect counts of successful compilations
2638 _sum_nmethod_size += code->total_size();
2639 _sum_nmethod_code_size += code->insts_size();
2640 _total_compile_count++;
2641
2642 if (UsePerfData) {
2643 _perf_sum_nmethod_size->inc( code->total_size());
2644 _perf_sum_nmethod_code_size->inc(code->insts_size());
2645 _perf_total_compile_count->inc();
2646 }
2647
2648 if (is_osr) {
2649 if (UsePerfData) _perf_total_osr_compile_count->inc();
2650 _total_osr_compile_count++;
2651 } else {
2652 if (UsePerfData) _perf_total_standard_compile_count->inc();
2653 _total_standard_compile_count++;
2654 }
2655 }
2656 // set the current method for the thread to null
2657 if (UsePerfData) counters->set_current_method("");
2658 }
2659
2660 const char* CompileBroker::compiler_name(int comp_level) {
2661 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2662 if (comp == NULL) {
2663 return "no compiler";
2664 } else {
2665 return (comp->name());
2666 }
2667 }
2668
2669 #if INCLUDE_JVMCI
2670 void CompileBroker::print_times(AbstractCompiler* comp) {
2671 CompilerStatistics* stats = comp->stats();
2672 if (stats) {
2673 tty->print_cr(" %s {speed: %d bytes/s; standard: %6.3f s, %d bytes, %d methods; osr: %6.3f s, %d bytes, %d methods; nmethods_size: %d bytes; nmethods_code_size: %d bytes}",
2674 comp->name(), stats->bytes_per_second(),
2675 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2676 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2677 stats->_nmethods_size, stats->_nmethods_code_size);
2678 } else { // if (!stats)
2679 assert(false, "Compiler statistics object must exist");
2680 }
2681 comp->print_timers();
2682 }
2683 #endif // INCLUDE_JVMCI
2684
2685 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2686 #if INCLUDE_JVMCI
2687 elapsedTimer standard_compilation;
2688 elapsedTimer total_compilation;
2689 elapsedTimer osr_compilation;
2690
2691 int standard_bytes_compiled = 0;
2692 int osr_bytes_compiled = 0;
2693
2694 int standard_compile_count = 0;
2695 int osr_compile_count = 0;
2696 int total_compile_count = 0;
2697
2698 int nmethods_size = 0;
2699 int nmethods_code_size = 0;
2700 bool printedHeader = false;
2701
2702 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2703 AbstractCompiler* comp = _compilers[i];
2704 if (comp != NULL) {
2705 if (per_compiler && aggregate && !printedHeader) {
2706 printedHeader = true;
2707 tty->cr();
2708 tty->print_cr("Individual compiler times (for compiled methods only)");
2709 tty->print_cr("------------------------------------------------");
2710 tty->cr();
2711 }
2712 CompilerStatistics* stats = comp->stats();
2713
2714 if (stats) {
2715 standard_compilation.add(stats->_standard._time);
2716 osr_compilation.add(stats->_osr._time);
2717
2718 standard_bytes_compiled += stats->_standard._bytes;
2719 osr_bytes_compiled += stats->_osr._bytes;
2720
2721 standard_compile_count += stats->_standard._count;
2722 osr_compile_count += stats->_osr._count;
2723
2724 nmethods_size += stats->_nmethods_size;
2725 nmethods_code_size += stats->_nmethods_code_size;
2726 } else { // if (!stats)
2727 assert(false, "Compiler statistics object must exist");
2728 }
2729
2730 if (per_compiler) {
2731 print_times(comp);
2732 }
2733 }
2734 }
2735 total_compile_count = osr_compile_count + standard_compile_count;
2736 total_compilation.add(osr_compilation);
2737 total_compilation.add(standard_compilation);
2738
2739 // In hosted mode, print the JVMCI compiler specific counters manually.
2740 if (!UseJVMCICompiler) {
2741 JVMCICompiler::print_compilation_timers();
2742 }
2743 #else // INCLUDE_JVMCI
2744 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2745 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2746 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2747
2748 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2749 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2750
2751 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2752 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2753 int total_compile_count = CompileBroker::_total_compile_count;
2754
2755 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2756 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2757 #endif // INCLUDE_JVMCI
2758
2759 if (!aggregate) {
2760 return;
2761 }
2762 tty->cr();
2763 tty->print_cr("Accumulated compiler times");
2764 tty->print_cr("----------------------------------------------------------");
2765 //0000000000111111111122222222223333333333444444444455555555556666666666
2766 //0123456789012345678901234567890123456789012345678901234567890123456789
2767 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2768 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2769 standard_compilation.seconds(),
2770 standard_compilation.seconds() / standard_compile_count);
2771 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2772 CompileBroker::_t_bailedout_compilation.seconds(),
2773 CompileBroker::_t_bailedout_compilation.seconds() / CompileBroker::_total_bailout_count);
2774 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2775 osr_compilation.seconds(),
2776 osr_compilation.seconds() / osr_compile_count);
2777 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2778 CompileBroker::_t_invalidated_compilation.seconds(),
2779 CompileBroker::_t_invalidated_compilation.seconds() / CompileBroker::_total_invalidated_count);
2780
2781 AbstractCompiler *comp = compiler(CompLevel_simple);
2782 if (comp != NULL) {
2783 tty->cr();
2784 comp->print_timers();
2785 }
2786 comp = compiler(CompLevel_full_optimization);
2787 if (comp != NULL) {
2788 tty->cr();
2789 comp->print_timers();
2790 }
2791 tty->cr();
2792 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2793 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2794 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2795 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2796 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2797 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2798 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2799 double tcs = total_compilation.seconds();
2800 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2801 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2802 tty->cr();
2803 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2804 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2805 }
2806
2807 // Print general/accumulated JIT information.
2808 void CompileBroker::print_info(outputStream *out) {
2809 if (out == NULL) out = tty;
2810 out->cr();
2811 out->print_cr("======================");
2812 out->print_cr(" General JIT info ");
2813 out->print_cr("======================");
2814 out->cr();
2815 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2816 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2817 out->cr();
2818 out->print_cr("CodeCache overview");
2819 out->print_cr("--------------------------------------------------------");
2820 out->cr();
2821 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2822 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2823 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2824 out->cr();
2825
2826 out->cr();
2827 out->print_cr("CodeCache cleaning overview");
2828 out->print_cr("--------------------------------------------------------");
2829 out->cr();
2830 NMethodSweeper::print(out);
2831 out->print_cr("--------------------------------------------------------");
2832 out->cr();
2833 }
2834
2835 // Note: tty_lock must not be held upon entry to this function.
2836 // Print functions called from herein do "micro-locking" on tty_lock.
2837 // That's a tradeoff which keeps together important blocks of output.
2838 // At the same time, continuous tty_lock hold time is kept in check,
2839 // preventing concurrently printing threads from stalling a long time.
2840 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2841 TimeStamp ts_total;
2842 TimeStamp ts_global;
2843 TimeStamp ts;
2844
2845 bool allFun = !strcmp(function, "all");
2846 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2847 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2848 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2849 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2850 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2851 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2852 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2853 bool discard = !strcmp(function, "discard") || allFun;
2854
2855 if (out == NULL) {
2856 out = tty;
2857 }
2858
2859 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2860 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2861 out->cr();
2862 return;
2863 }
2864
2865 ts_total.update(); // record starting point
2866
2867 if (aggregate) {
2868 print_info(out);
2869 }
2870
2871 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2872 // That prevents another thread from destroying our view on the CodeHeap.
2873 // When we request individual parts of the analysis via the jcmd interface, it is possible
2874 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2875 // updated the aggregated data. That's a tolerable tradeoff because we can't hold a lock
2876 // across user interaction.
2877 // Acquire this lock before acquiring the CodeCache_lock.
2878 // CodeHeapStateAnalytics_lock could be held by a concurrent thread for a long time,
2879 // leading to an unnecessarily long hold time of the CodeCache_lock.
2880 ts.update(); // record starting point
2881 MutexLocker mu1(CodeHeapStateAnalytics_lock, Mutex::_no_safepoint_check_flag);
2882 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2883
2884 // If we serve an "allFun" call, it is beneficial to hold the CodeCache_lock
2885 // for the entire duration of aggregation and printing. That makes sure
2886 // we see a consistent picture and do not run into issues caused by
2887 // the CodeHeap being altered concurrently.
2888 Mutex* global_lock = allFun ? CodeCache_lock : NULL;
2889 Mutex* function_lock = allFun ? NULL : CodeCache_lock;
2890 ts_global.update(); // record starting point
2891 MutexLocker mu2(global_lock, Mutex::_no_safepoint_check_flag);
2892 if (global_lock != NULL) {
2893 out->print_cr("\n__ CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2894 ts_global.update(); // record starting point
2895 }
2896
2897 if (aggregate) {
2898 ts.update(); // record starting point
2899 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2900 if (function_lock != NULL) {
2901 out->print_cr("\n__ CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2902 }
2903
2904 ts.update(); // record starting point
2905 CodeCache::aggregate(out, granularity);
2906 if (function_lock != NULL) {
2907 out->print_cr("\n__ CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2908 }
2909 }
2910
2911 if (usedSpace) CodeCache::print_usedSpace(out);
2912 if (freeSpace) CodeCache::print_freeSpace(out);
2913 if (methodCount) CodeCache::print_count(out);
2914 if (methodSpace) CodeCache::print_space(out);
2915 if (methodAge) CodeCache::print_age(out);
2916 if (methodNames) {
2917 // print_names() has shown to be sensitive to concurrent CodeHeap modifications.
2918 // Therefore, request the CodeCache_lock before calling...
2919 MutexLocker mu3(function_lock, Mutex::_no_safepoint_check_flag);
2920 CodeCache::print_names(out);
2921 }
2922 if (discard) CodeCache::discard(out);
2923
2924 if (global_lock != NULL) {
2925 out->print_cr("\n__ CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2926 }
2927 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2928 }