1 /*
2 * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "jvm.h"
27 #include "classfile/javaClasses.hpp"
28 #include "classfile/symbolTable.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/codeHeapState.hpp"
33 #include "code/dependencyContext.hpp"
34 #include "compiler/compilationPolicy.hpp"
35 #include "compiler/compileBroker.hpp"
36 #include "compiler/compileLog.hpp"
37 #include "compiler/compilerEvent.hpp"
38 #include "compiler/compilerOracle.hpp"
39 #include "compiler/directivesParser.hpp"
40 #include "interpreter/linkResolver.hpp"
41 #include "jfr/jfrEvents.hpp"
42 #include "logging/log.hpp"
43 #include "logging/logStream.hpp"
44 #include "memory/allocation.inline.hpp"
45 #include "memory/resourceArea.hpp"
46 #include "memory/universe.hpp"
47 #include "oops/methodData.hpp"
48 #include "oops/method.inline.hpp"
49 #include "oops/oop.inline.hpp"
50 #include "prims/jvmtiExport.hpp"
51 #include "prims/nativeLookup.hpp"
52 #include "prims/whitebox.hpp"
53 #include "runtime/atomic.hpp"
54 #include "runtime/escapeBarrier.hpp"
55 #include "runtime/globals_extension.hpp"
56 #include "runtime/handles.inline.hpp"
57 #include "runtime/init.hpp"
58 #include "runtime/interfaceSupport.inline.hpp"
59 #include "runtime/java.hpp"
60 #include "runtime/javaCalls.hpp"
61 #include "runtime/jniHandles.inline.hpp"
62 #include "runtime/os.hpp"
63 #include "runtime/perfData.hpp"
64 #include "runtime/safepointVerifiers.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/sweeper.hpp"
67 #include "runtime/threadSMR.hpp"
68 #include "runtime/timerTrace.hpp"
69 #include "runtime/vframe.inline.hpp"
70 #include "utilities/debug.hpp"
71 #include "utilities/dtrace.hpp"
72 #include "utilities/events.hpp"
73 #include "utilities/formatBuffer.hpp"
74 #include "utilities/macros.hpp"
75 #ifdef COMPILER1
76 #include "c1/c1_Compiler.hpp"
77 #endif
78 #if INCLUDE_JVMCI
79 #include "jvmci/jvmciEnv.hpp"
80 #include "jvmci/jvmciRuntime.hpp"
81 #endif
82 #ifdef COMPILER2
83 #include "opto/c2compiler.hpp"
84 #endif
85
86 #ifdef DTRACE_ENABLED
87
88 // Only bother with this argument setup if dtrace is available
89
90 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name) \
91 { \
92 Symbol* klass_name = (method)->klass_name(); \
93 Symbol* name = (method)->name(); \
94 Symbol* signature = (method)->signature(); \
95 HOTSPOT_METHOD_COMPILE_BEGIN( \
96 (char *) comp_name, strlen(comp_name), \
97 (char *) klass_name->bytes(), klass_name->utf8_length(), \
98 (char *) name->bytes(), name->utf8_length(), \
99 (char *) signature->bytes(), signature->utf8_length()); \
100 }
101
102 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success) \
103 { \
104 Symbol* klass_name = (method)->klass_name(); \
105 Symbol* name = (method)->name(); \
106 Symbol* signature = (method)->signature(); \
107 HOTSPOT_METHOD_COMPILE_END( \
108 (char *) comp_name, strlen(comp_name), \
109 (char *) klass_name->bytes(), klass_name->utf8_length(), \
110 (char *) name->bytes(), name->utf8_length(), \
111 (char *) signature->bytes(), signature->utf8_length(), (success)); \
112 }
113
114 #else // ndef DTRACE_ENABLED
115
116 #define DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, comp_name)
117 #define DTRACE_METHOD_COMPILE_END_PROBE(method, comp_name, success)
118
119 #endif // ndef DTRACE_ENABLED
120
121 bool CompileBroker::_initialized = false;
122 volatile bool CompileBroker::_should_block = false;
123 volatile int CompileBroker::_print_compilation_warning = 0;
124 volatile jint CompileBroker::_should_compile_new_jobs = run_compilation;
125
126 // The installed compiler(s)
127 AbstractCompiler* CompileBroker::_compilers[2];
128
129 // The maximum numbers of compiler threads to be determined during startup.
130 int CompileBroker::_c1_count = 0;
131 int CompileBroker::_c2_count = 0;
132
133 // An array of compiler names as Java String objects
134 jobject* CompileBroker::_compiler1_objects = NULL;
135 jobject* CompileBroker::_compiler2_objects = NULL;
136
137 CompileLog** CompileBroker::_compiler1_logs = NULL;
138 CompileLog** CompileBroker::_compiler2_logs = NULL;
139
140 // These counters are used to assign an unique ID to each compilation.
141 volatile jint CompileBroker::_compilation_id = 0;
142 volatile jint CompileBroker::_osr_compilation_id = 0;
143 volatile jint CompileBroker::_native_compilation_id = 0;
144
145 // Performance counters
146 PerfCounter* CompileBroker::_perf_total_compilation = NULL;
147 PerfCounter* CompileBroker::_perf_osr_compilation = NULL;
148 PerfCounter* CompileBroker::_perf_standard_compilation = NULL;
149
150 PerfCounter* CompileBroker::_perf_total_bailout_count = NULL;
151 PerfCounter* CompileBroker::_perf_total_invalidated_count = NULL;
152 PerfCounter* CompileBroker::_perf_total_compile_count = NULL;
153 PerfCounter* CompileBroker::_perf_total_osr_compile_count = NULL;
154 PerfCounter* CompileBroker::_perf_total_standard_compile_count = NULL;
155
156 PerfCounter* CompileBroker::_perf_sum_osr_bytes_compiled = NULL;
157 PerfCounter* CompileBroker::_perf_sum_standard_bytes_compiled = NULL;
158 PerfCounter* CompileBroker::_perf_sum_nmethod_size = NULL;
159 PerfCounter* CompileBroker::_perf_sum_nmethod_code_size = NULL;
160
161 PerfStringVariable* CompileBroker::_perf_last_method = NULL;
162 PerfStringVariable* CompileBroker::_perf_last_failed_method = NULL;
163 PerfStringVariable* CompileBroker::_perf_last_invalidated_method = NULL;
164 PerfVariable* CompileBroker::_perf_last_compile_type = NULL;
165 PerfVariable* CompileBroker::_perf_last_compile_size = NULL;
166 PerfVariable* CompileBroker::_perf_last_failed_type = NULL;
167 PerfVariable* CompileBroker::_perf_last_invalidated_type = NULL;
168
169 // Timers and counters for generating statistics
170 elapsedTimer CompileBroker::_t_total_compilation;
171 elapsedTimer CompileBroker::_t_osr_compilation;
172 elapsedTimer CompileBroker::_t_standard_compilation;
173 elapsedTimer CompileBroker::_t_invalidated_compilation;
174 elapsedTimer CompileBroker::_t_bailedout_compilation;
175
176 int CompileBroker::_total_bailout_count = 0;
177 int CompileBroker::_total_invalidated_count = 0;
178 int CompileBroker::_total_compile_count = 0;
179 int CompileBroker::_total_osr_compile_count = 0;
180 int CompileBroker::_total_standard_compile_count = 0;
181 int CompileBroker::_total_compiler_stopped_count = 0;
182 int CompileBroker::_total_compiler_restarted_count = 0;
183
184 int CompileBroker::_sum_osr_bytes_compiled = 0;
185 int CompileBroker::_sum_standard_bytes_compiled = 0;
186 int CompileBroker::_sum_nmethod_size = 0;
187 int CompileBroker::_sum_nmethod_code_size = 0;
188
189 jlong CompileBroker::_peak_compilation_time = 0;
190
191 CompilerStatistics CompileBroker::_stats_per_level[CompLevel_full_optimization];
192
193 CompileQueue* CompileBroker::_c2_compile_queue = NULL;
194 CompileQueue* CompileBroker::_c1_compile_queue = NULL;
195
196
197
198 class CompilationLog : public StringEventLog {
199 public:
200 CompilationLog() : StringEventLog("Compilation events", "jit") {
201 }
202
203 void log_compile(JavaThread* thread, CompileTask* task) {
204 StringLogMessage lm;
205 stringStream sstr(lm.buffer(), lm.size());
206 // msg.time_stamp().update_to(tty->time_stamp().ticks());
207 task->print(&sstr, NULL, true, false);
208 log(thread, "%s", (const char*)lm);
209 }
210
211 void log_nmethod(JavaThread* thread, nmethod* nm) {
212 log(thread, "nmethod %d%s " INTPTR_FORMAT " code [" INTPTR_FORMAT ", " INTPTR_FORMAT "]",
213 nm->compile_id(), nm->is_osr_method() ? "%" : "",
214 p2i(nm), p2i(nm->code_begin()), p2i(nm->code_end()));
215 }
216
217 void log_failure(JavaThread* thread, CompileTask* task, const char* reason, const char* retry_message) {
218 StringLogMessage lm;
219 lm.print("%4d COMPILE SKIPPED: %s", task->compile_id(), reason);
220 if (retry_message != NULL) {
221 lm.append(" (%s)", retry_message);
222 }
223 lm.print("\n");
224 log(thread, "%s", (const char*)lm);
225 }
226
227 void log_metaspace_failure(const char* reason) {
228 // Note: This method can be called from non-Java/compiler threads to
229 // log the global metaspace failure that might affect profiling.
230 ResourceMark rm;
231 StringLogMessage lm;
232 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
233 lm.print("\n");
234 log(Thread::current(), "%s", (const char*)lm);
235 }
236 };
237
238 static CompilationLog* _compilation_log = NULL;
239
240 bool compileBroker_init() {
241 if (LogEvents) {
242 _compilation_log = new CompilationLog();
243 }
244
245 // init directives stack, adding default directive
246 DirectivesStack::init();
247
248 if (DirectivesParser::has_file()) {
249 return DirectivesParser::parse_from_flag();
250 } else if (CompilerDirectivesPrint) {
251 // Print default directive even when no other was added
252 DirectivesStack::print(tty);
253 }
254
255 return true;
256 }
257
258 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
259 CompilerThread* thread = CompilerThread::current();
260 thread->set_task(task);
261 CompileLog* log = thread->log();
262 if (log != NULL && !task->is_unloaded()) task->log_task_start(log);
263 }
264
265 CompileTaskWrapper::~CompileTaskWrapper() {
266 CompilerThread* thread = CompilerThread::current();
267 CompileTask* task = thread->task();
268 CompileLog* log = thread->log();
269 if (log != NULL && !task->is_unloaded()) task->log_task_done(log);
270 thread->set_task(NULL);
271 task->set_code_handle(NULL);
272 thread->set_env(NULL);
273 if (task->is_blocking()) {
274 bool free_task = false;
275 {
276 MutexLocker notifier(thread, task->lock());
277 task->mark_complete();
278 #if INCLUDE_JVMCI
279 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
280 if (!task->has_waiter()) {
281 // The waiting thread timed out and thus did not free the task.
282 free_task = true;
283 }
284 task->set_blocking_jvmci_compile_state(NULL);
285 }
286 #endif
287 if (!free_task) {
288 // Notify the waiting thread that the compilation has completed
289 // so that it can free the task.
290 task->lock()->notify_all();
291 }
292 }
293 if (free_task) {
294 // The task can only be freed once the task lock is released.
295 CompileTask::free(task);
296 }
297 } else {
298 task->mark_complete();
299
300 // By convention, the compiling thread is responsible for
301 // recycling a non-blocking CompileTask.
302 CompileTask::free(task);
303 }
304 }
305
306 /**
307 * Check if a CompilerThread can be removed and update count if requested.
308 */
309 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
310 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
311 if (!ReduceNumberOfCompilerThreads) return false;
312
313 AbstractCompiler *compiler = ct->compiler();
314 int compiler_count = compiler->num_compiler_threads();
315 bool c1 = compiler->is_c1();
316
317 // Keep at least 1 compiler thread of each type.
318 if (compiler_count < 2) return false;
319
320 // Keep thread alive for at least some time.
321 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
322
323 #if INCLUDE_JVMCI
324 if (compiler->is_jvmci()) {
325 // Handles for JVMCI thread objects may get released concurrently.
326 if (do_it) {
327 assert(CompileThread_lock->owner() == ct, "must be holding lock");
328 } else {
329 // Skip check if it's the last thread and let caller check again.
330 return true;
331 }
332 }
333 #endif
334
335 // We only allow the last compiler thread of each type to get removed.
336 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
337 : compiler2_object(compiler_count - 1);
338 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
339 if (do_it) {
340 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
341 compiler->set_num_compiler_threads(compiler_count - 1);
342 #if INCLUDE_JVMCI
343 if (compiler->is_jvmci()) {
344 // Old j.l.Thread object can die when no longer referenced elsewhere.
345 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
346 _compiler2_objects[compiler_count - 1] = NULL;
347 }
348 #endif
349 }
350 return true;
351 }
352 return false;
353 }
354
355 /**
356 * Add a CompileTask to a CompileQueue.
357 */
358 void CompileQueue::add(CompileTask* task) {
359 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
360
361 task->set_next(NULL);
362 task->set_prev(NULL);
363
364 if (_last == NULL) {
365 // The compile queue is empty.
366 assert(_first == NULL, "queue is empty");
367 _first = task;
368 _last = task;
369 } else {
370 // Append the task to the queue.
371 assert(_last->next() == NULL, "not last");
372 _last->set_next(task);
373 task->set_prev(_last);
374 _last = task;
375 }
376 ++_size;
377
378 // Mark the method as being in the compile queue.
379 task->method()->set_queued_for_compilation();
380
381 if (CIPrintCompileQueue) {
382 print_tty();
383 }
384
385 if (LogCompilation && xtty != NULL) {
386 task->log_task_queued();
387 }
388
389 // Notify CompilerThreads that a task is available.
390 MethodCompileQueue_lock->notify_all();
391 }
392
393 /**
394 * Empties compilation queue by putting all compilation tasks onto
395 * a freelist. Furthermore, the method wakes up all threads that are
396 * waiting on a compilation task to finish. This can happen if background
397 * compilation is disabled.
398 */
399 void CompileQueue::free_all() {
400 MutexLocker mu(MethodCompileQueue_lock);
401 CompileTask* next = _first;
402
403 // Iterate over all tasks in the compile queue
404 while (next != NULL) {
405 CompileTask* current = next;
406 next = current->next();
407 {
408 // Wake up thread that blocks on the compile task.
409 MutexLocker ct_lock(current->lock());
410 current->lock()->notify();
411 }
412 // Put the task back on the freelist.
413 CompileTask::free(current);
414 }
415 _first = NULL;
416 _last = NULL;
417
418 // Wake up all threads that block on the queue.
419 MethodCompileQueue_lock->notify_all();
420 }
421
422 /**
423 * Get the next CompileTask from a CompileQueue
424 */
425 CompileTask* CompileQueue::get() {
426 // save methods from RedefineClasses across safepoint
427 // across MethodCompileQueue_lock below.
428 methodHandle save_method;
429 methodHandle save_hot_method;
430
431 MonitorLocker locker(MethodCompileQueue_lock);
432 // If _first is NULL we have no more compile jobs. There are two reasons for
433 // having no compile jobs: First, we compiled everything we wanted. Second,
434 // we ran out of code cache so compilation has been disabled. In the latter
435 // case we perform code cache sweeps to free memory such that we can re-enable
436 // compilation.
437 while (_first == NULL) {
438 // Exit loop if compilation is disabled forever
439 if (CompileBroker::is_compilation_disabled_forever()) {
440 return NULL;
441 }
442
443 // If there are no compilation tasks and we can compile new jobs
444 // (i.e., there is enough free space in the code cache) there is
445 // no need to invoke the sweeper. As a result, the hotness of methods
446 // remains unchanged. This behavior is desired, since we want to keep
447 // the stable state, i.e., we do not want to evict methods from the
448 // code cache if it is unnecessary.
449 // We need a timed wait here, since compiler threads can exit if compilation
450 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
451 // is not critical and we do not want idle compiler threads to wake up too often.
452 locker.wait(5*1000);
453
454 if (UseDynamicNumberOfCompilerThreads && _first == NULL) {
455 // Still nothing to compile. Give caller a chance to stop this thread.
456 if (CompileBroker::can_remove(CompilerThread::current(), false)) return NULL;
457 }
458 }
459
460 if (CompileBroker::is_compilation_disabled_forever()) {
461 return NULL;
462 }
463
464 CompileTask* task;
465 {
466 NoSafepointVerifier nsv;
467 task = CompilationPolicy::select_task(this);
468 if (task != NULL) {
469 task = task->select_for_compilation();
470 }
471 }
472
473 if (task != NULL) {
474 // Save method pointers across unlock safepoint. The task is removed from
475 // the compilation queue, which is walked during RedefineClasses.
476 Thread* thread = Thread::current();
477 save_method = methodHandle(thread, task->method());
478 save_hot_method = methodHandle(thread, task->hot_method());
479
480 remove(task);
481 }
482 purge_stale_tasks(); // may temporarily release MCQ lock
483 return task;
484 }
485
486 // Clean & deallocate stale compile tasks.
487 // Temporarily releases MethodCompileQueue lock.
488 void CompileQueue::purge_stale_tasks() {
489 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
490 if (_first_stale != NULL) {
491 // Stale tasks are purged when MCQ lock is released,
492 // but _first_stale updates are protected by MCQ lock.
493 // Once task processing starts and MCQ lock is released,
494 // other compiler threads can reuse _first_stale.
495 CompileTask* head = _first_stale;
496 _first_stale = NULL;
497 {
498 MutexUnlocker ul(MethodCompileQueue_lock);
499 for (CompileTask* task = head; task != NULL; ) {
500 CompileTask* next_task = task->next();
501 CompileTaskWrapper ctw(task); // Frees the task
502 task->set_failure_reason("stale task");
503 task = next_task;
504 }
505 }
506 }
507 }
508
509 void CompileQueue::remove(CompileTask* task) {
510 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
511 if (task->prev() != NULL) {
512 task->prev()->set_next(task->next());
513 } else {
514 // max is the first element
515 assert(task == _first, "Sanity");
516 _first = task->next();
517 }
518
519 if (task->next() != NULL) {
520 task->next()->set_prev(task->prev());
521 } else {
522 // max is the last element
523 assert(task == _last, "Sanity");
524 _last = task->prev();
525 }
526 --_size;
527 }
528
529 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
530 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
531 remove(task);
532
533 // Enqueue the task for reclamation (should be done outside MCQ lock)
534 task->set_next(_first_stale);
535 task->set_prev(NULL);
536 _first_stale = task;
537 }
538
539 // methods in the compile queue need to be marked as used on the stack
540 // so that they don't get reclaimed by Redefine Classes
541 void CompileQueue::mark_on_stack() {
542 CompileTask* task = _first;
543 while (task != NULL) {
544 task->mark_on_stack();
545 task = task->next();
546 }
547 }
548
549
550 CompileQueue* CompileBroker::compile_queue(int comp_level) {
551 if (is_c2_compile(comp_level)) return _c2_compile_queue;
552 if (is_c1_compile(comp_level)) return _c1_compile_queue;
553 return NULL;
554 }
555
556 void CompileBroker::print_compile_queues(outputStream* st) {
557 st->print_cr("Current compiles: ");
558
559 char buf[2000];
560 int buflen = sizeof(buf);
561 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
562
563 st->cr();
564 if (_c1_compile_queue != NULL) {
565 _c1_compile_queue->print(st);
566 }
567 if (_c2_compile_queue != NULL) {
568 _c2_compile_queue->print(st);
569 }
570 }
571
572 void CompileQueue::print(outputStream* st) {
573 assert_locked_or_safepoint(MethodCompileQueue_lock);
574 st->print_cr("%s:", name());
575 CompileTask* task = _first;
576 if (task == NULL) {
577 st->print_cr("Empty");
578 } else {
579 while (task != NULL) {
580 task->print(st, NULL, true, true);
581 task = task->next();
582 }
583 }
584 st->cr();
585 }
586
587 void CompileQueue::print_tty() {
588 ResourceMark rm;
589 stringStream ss;
590 // Dump the compile queue into a buffer before locking the tty
591 print(&ss);
592 {
593 ttyLocker ttyl;
594 tty->print("%s", ss.as_string());
595 }
596 }
597
598 CompilerCounters::CompilerCounters() {
599 _current_method[0] = '\0';
600 _compile_type = CompileBroker::no_compile;
601 }
602
603 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
604 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
605 // in compiler/compilerEvent.cpp) and registers it with its serializer.
606 //
607 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
608 // so if c2 is used, it should be always registered first.
609 // This function is called during vm initialization.
610 void register_jfr_phasetype_serializer(CompilerType compiler_type) {
611 ResourceMark rm;
612 static bool first_registration = true;
613 if (compiler_type == compiler_jvmci) {
614 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
615 first_registration = false;
616 #ifdef COMPILER2
617 } else if (compiler_type == compiler_c2) {
618 assert(first_registration, "invariant"); // c2 must be registered first.
619 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
620 const char* phase_name = CompilerPhaseTypeHelper::to_description((CompilerPhaseType) i);
621 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
622 }
623 first_registration = false;
624 #endif // COMPILER2
625 }
626 }
627 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
628
629 // ------------------------------------------------------------------
630 // CompileBroker::compilation_init
631 //
632 // Initialize the Compilation object
633 void CompileBroker::compilation_init_phase1(JavaThread* THREAD) {
634 // No need to initialize compilation system if we do not use it.
635 if (!UseCompiler) {
636 return;
637 }
638 // Set the interface to the current compiler(s).
639 _c1_count = CompilationPolicy::c1_count();
640 _c2_count = CompilationPolicy::c2_count();
641
642 #if INCLUDE_JVMCI
643 if (EnableJVMCI) {
644 // This is creating a JVMCICompiler singleton.
645 JVMCICompiler* jvmci = new JVMCICompiler();
646
647 if (UseJVMCICompiler) {
648 _compilers[1] = jvmci;
649 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
650 if (BootstrapJVMCI) {
651 // JVMCI will bootstrap so give it more threads
652 _c2_count = MIN2(32, os::active_processor_count());
653 }
654 } else {
655 _c2_count = JVMCIThreads;
656 }
657 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
658 } else {
659 #ifdef COMPILER1
660 _c1_count = JVMCIHostThreads;
661 #endif // COMPILER1
662 }
663 }
664 }
665 #endif // INCLUDE_JVMCI
666
667 #ifdef COMPILER1
668 if (_c1_count > 0) {
669 _compilers[0] = new Compiler();
670 }
671 #endif // COMPILER1
672
673 #ifdef COMPILER2
674 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
675 if (_c2_count > 0) {
676 _compilers[1] = new C2Compiler();
677 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
678 // idToPhase mapping for c2 is in opto/phasetype.hpp
679 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
680 }
681 }
682 #endif // COMPILER2
683
684 #if INCLUDE_JVMCI
685 // Register after c2 registration.
686 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
687 if (EnableJVMCI) {
688 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
689 }
690 #endif // INCLUDE_JVMCI
691
692 // Start the compiler thread(s) and the sweeper thread
693 init_compiler_sweeper_threads();
694 // totalTime performance counter is always created as it is required
695 // by the implementation of java.lang.management.CompilationMXBean.
696 {
697 // Ensure OOM leads to vm_exit_during_initialization.
698 EXCEPTION_MARK;
699 _perf_total_compilation =
700 PerfDataManager::create_counter(JAVA_CI, "totalTime",
701 PerfData::U_Ticks, CHECK);
702 }
703
704 if (UsePerfData) {
705
706 EXCEPTION_MARK;
707
708 // create the jvmstat performance counters
709 _perf_osr_compilation =
710 PerfDataManager::create_counter(SUN_CI, "osrTime",
711 PerfData::U_Ticks, CHECK);
712
713 _perf_standard_compilation =
714 PerfDataManager::create_counter(SUN_CI, "standardTime",
715 PerfData::U_Ticks, CHECK);
716
717 _perf_total_bailout_count =
718 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
719 PerfData::U_Events, CHECK);
720
721 _perf_total_invalidated_count =
722 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
723 PerfData::U_Events, CHECK);
724
725 _perf_total_compile_count =
726 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
727 PerfData::U_Events, CHECK);
728 _perf_total_osr_compile_count =
729 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
730 PerfData::U_Events, CHECK);
731
732 _perf_total_standard_compile_count =
733 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
734 PerfData::U_Events, CHECK);
735
736 _perf_sum_osr_bytes_compiled =
737 PerfDataManager::create_counter(SUN_CI, "osrBytes",
738 PerfData::U_Bytes, CHECK);
739
740 _perf_sum_standard_bytes_compiled =
741 PerfDataManager::create_counter(SUN_CI, "standardBytes",
742 PerfData::U_Bytes, CHECK);
743
744 _perf_sum_nmethod_size =
745 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
746 PerfData::U_Bytes, CHECK);
747
748 _perf_sum_nmethod_code_size =
749 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
750 PerfData::U_Bytes, CHECK);
751
752 _perf_last_method =
753 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
754 CompilerCounters::cmname_buffer_length,
755 "", CHECK);
756
757 _perf_last_failed_method =
758 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
759 CompilerCounters::cmname_buffer_length,
760 "", CHECK);
761
762 _perf_last_invalidated_method =
763 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
764 CompilerCounters::cmname_buffer_length,
765 "", CHECK);
766
767 _perf_last_compile_type =
768 PerfDataManager::create_variable(SUN_CI, "lastType",
769 PerfData::U_None,
770 (jlong)CompileBroker::no_compile,
771 CHECK);
772
773 _perf_last_compile_size =
774 PerfDataManager::create_variable(SUN_CI, "lastSize",
775 PerfData::U_Bytes,
776 (jlong)CompileBroker::no_compile,
777 CHECK);
778
779
780 _perf_last_failed_type =
781 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
782 PerfData::U_None,
783 (jlong)CompileBroker::no_compile,
784 CHECK);
785
786 _perf_last_invalidated_type =
787 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
788 PerfData::U_None,
789 (jlong)CompileBroker::no_compile,
790 CHECK);
791 }
792 }
793
794 // Completes compiler initialization. Compilation requests submitted
795 // prior to this will be silently ignored.
796 void CompileBroker::compilation_init_phase2() {
797 _initialized = true;
798 }
799
800 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
801 Handle thread_oop = JavaThread::create_system_thread_object(name, false /* not visible */, CHECK_NH);
802 return thread_oop;
803 }
804
805 #if defined(ASSERT) && COMPILER2_OR_JVMCI
806 // Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to
807 // the running java application. Configured with vm options DeoptimizeObjectsALot*.
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 // Entry for DeoptimizeObjectsALotThread. The threads are started in
821 // CompileBroker::init_compiler_sweeper_threads() iff DeoptimizeObjectsALot is enabled
822 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
823 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
824 bool enter_single_loop;
825 {
826 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
827 static int single_thread_count = 0;
828 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
829 }
830 if (enter_single_loop) {
831 dt->deoptimize_objects_alot_loop_single();
832 } else {
833 dt->deoptimize_objects_alot_loop_all();
834 }
835 }
836
837 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
838 // barrier targets a single thread which is selected round robin.
839 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
840 HandleMark hm(this);
841 while (true) {
842 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
843 { // Begin new scope for escape barrier
844 HandleMarkCleaner hmc(this);
845 ResourceMark rm(this);
846 EscapeBarrier eb(true, this, deoptee_thread);
847 eb.deoptimize_objects(100);
848 }
849 // Now sleep after the escape barriers destructor resumed deoptee_thread.
850 sleep(DeoptimizeObjectsALotInterval);
851 }
852 }
853 }
854
855 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
856 // barrier targets all java threads in the vm at once.
857 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
858 HandleMark hm(this);
859 while (true) {
860 { // Begin new scope for escape barrier
861 HandleMarkCleaner hmc(this);
862 ResourceMark rm(this);
863 EscapeBarrier eb(true, this);
864 eb.deoptimize_objects_all_threads();
865 }
866 // Now sleep after the escape barriers destructor resumed the java threads.
867 sleep(DeoptimizeObjectsALotInterval);
868 }
869 }
870 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
871
872
873 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
874 JavaThread* new_thread = NULL;
875
876 switch (type) {
877 case compiler_t:
878 assert(comp != NULL, "Compiler instance missing.");
879 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
880 CompilerCounters* counters = new CompilerCounters();
881 new_thread = new CompilerThread(queue, counters);
882 }
883 break;
884 case sweeper_t:
885 new_thread = new CodeCacheSweeperThread();
886 break;
887 #if defined(ASSERT) && COMPILER2_OR_JVMCI
888 case deoptimizer_t:
889 new_thread = new DeoptimizeObjectsALotThread();
890 break;
891 #endif // ASSERT
892 default:
893 ShouldNotReachHere();
894 }
895
896 // At this point the new CompilerThread data-races with this startup
897 // thread (which is the main thread and NOT the VM thread).
898 // This means Java bytecodes being executed at startup can
899 // queue compile jobs which will run at whatever default priority the
900 // newly created CompilerThread runs at.
901
902
903 // At this point it may be possible that no osthread was created for the
904 // JavaThread due to lack of resources. We will handle that failure below.
905 // Also check new_thread so that static analysis is happy.
906 if (new_thread != NULL && new_thread->osthread() != NULL) {
907 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
908
909 if (type == compiler_t) {
910 CompilerThread::cast(new_thread)->set_compiler(comp);
911 }
912
913 // Note that we cannot call os::set_priority because it expects Java
914 // priorities and we are *explicitly* using OS priorities so that it's
915 // possible to set the compiler thread priority higher than any Java
916 // thread.
917
918 int native_prio = CompilerThreadPriority;
919 if (native_prio == -1) {
920 if (UseCriticalCompilerThreadPriority) {
921 native_prio = os::java_to_os_priority[CriticalPriority];
922 } else {
923 native_prio = os::java_to_os_priority[NearMaxPriority];
924 }
925 }
926 os::set_native_priority(new_thread, native_prio);
927
928 // Note that this only sets the JavaThread _priority field, which by
929 // definition is limited to Java priorities and not OS priorities.
930 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
931
932 } else { // osthread initialization failure
933 if (UseDynamicNumberOfCompilerThreads && type == compiler_t
934 && comp->num_compiler_threads() > 0) {
935 // The new thread is not known to Thread-SMR yet so we can just delete.
936 delete new_thread;
937 return NULL;
938 } else {
939 vm_exit_during_initialization("java.lang.OutOfMemoryError",
940 os::native_thread_creation_failed_msg());
941 }
942 }
943
944 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
945
946 return new_thread;
947 }
948
949
950 void CompileBroker::init_compiler_sweeper_threads() {
951 NMethodSweeper::set_sweep_threshold_bytes(static_cast<size_t>(SweeperThreshold * ReservedCodeCacheSize / 100.0));
952 log_info(codecache, sweep)("Sweeper threshold: " SIZE_FORMAT " bytes", NMethodSweeper::sweep_threshold_bytes());
953
954 // Ensure any exceptions lead to vm_exit_during_initialization.
955 EXCEPTION_MARK;
956 #if !defined(ZERO)
957 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
958 #endif // !ZERO
959 // Initialize the compilation queue
960 if (_c2_count > 0) {
961 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
962 _c2_compile_queue = new CompileQueue(name);
963 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
964 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
965 }
966 if (_c1_count > 0) {
967 _c1_compile_queue = new CompileQueue("C1 compile queue");
968 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
969 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
970 }
971
972 char name_buffer[256];
973
974 for (int i = 0; i < _c2_count; i++) {
975 jobject thread_handle = NULL;
976 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
977 // for JVMCI compiler which can create further ones on demand.
978 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
979 // Create a name for our thread.
980 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
981 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
982 thread_handle = JNIHandles::make_global(thread_oop);
983 JVMCI_ONLY(})
984 _compiler2_objects[i] = thread_handle;
985 _compiler2_logs[i] = NULL;
986
987 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
988 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
989 assert(ct != NULL, "should have been handled for initial thread");
990 _compilers[1]->set_num_compiler_threads(i + 1);
991 if (TraceCompilerThreads) {
992 ResourceMark rm;
993 ThreadsListHandle tlh; // name() depends on the TLH.
994 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
995 tty->print_cr("Added initial compiler thread %s", ct->name());
996 }
997 }
998 }
999
1000 for (int i = 0; i < _c1_count; i++) {
1001 // Create a name for our thread.
1002 sprintf(name_buffer, "C1 CompilerThread%d", i);
1003 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1004 jobject thread_handle = JNIHandles::make_global(thread_oop);
1005 _compiler1_objects[i] = thread_handle;
1006 _compiler1_logs[i] = NULL;
1007
1008 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1009 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
1010 assert(ct != NULL, "should have been handled for initial thread");
1011 _compilers[0]->set_num_compiler_threads(i + 1);
1012 if (TraceCompilerThreads) {
1013 ResourceMark rm;
1014 ThreadsListHandle tlh; // name() depends on the TLH.
1015 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1016 tty->print_cr("Added initial compiler thread %s", ct->name());
1017 }
1018 }
1019 }
1020
1021 if (UsePerfData) {
1022 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
1023 }
1024
1025 if (MethodFlushing) {
1026 // Initialize the sweeper thread
1027 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK);
1028 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1029 make_thread(sweeper_t, thread_handle, NULL, NULL, THREAD);
1030 }
1031
1032 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1033 if (DeoptimizeObjectsALot) {
1034 // Initialize and start the object deoptimizer threads
1035 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1036 for (int count = 0; count < total_count; count++) {
1037 Handle thread_oop = create_thread_oop("Deoptimize objects a lot single mode", CHECK);
1038 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1039 make_thread(deoptimizer_t, thread_handle, NULL, NULL, THREAD);
1040 }
1041 }
1042 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1043 }
1044
1045 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
1046
1047 julong available_memory = os::available_memory();
1048 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1049 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1050 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1051
1052 // Only do attempt to start additional threads if the lock is free.
1053 if (!CompileThread_lock->try_lock()) return;
1054
1055 if (_c2_compile_queue != NULL) {
1056 int old_c2_count = _compilers[1]->num_compiler_threads();
1057 int new_c2_count = MIN4(_c2_count,
1058 _c2_compile_queue->size() / 2,
1059 (int)(available_memory / (200*M)),
1060 (int)(available_cc_np / (128*K)));
1061
1062 for (int i = old_c2_count; i < new_c2_count; i++) {
1063 #if INCLUDE_JVMCI
1064 if (UseJVMCICompiler) {
1065 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
1066 // objects as their existence is completely hidden from the rest of
1067 // the VM (and those compiler threads can't call Java code to do the
1068 // creation anyway). For JVMCI we have to create new j.l.Thread objects
1069 // as they are visible and we can see unexpected thread lifecycle
1070 // transitions if we bind them to new JavaThreads.
1071 if (!THREAD->can_call_java()) break;
1072 char name_buffer[256];
1073 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
1074 Handle thread_oop;
1075 {
1076 // We have to give up the lock temporarily for the Java calls.
1077 MutexUnlocker mu(CompileThread_lock);
1078 thread_oop = create_thread_oop(name_buffer, THREAD);
1079 }
1080 if (HAS_PENDING_EXCEPTION) {
1081 if (TraceCompilerThreads) {
1082 ResourceMark rm;
1083 tty->print_cr("JVMCI compiler thread creation failed:");
1084 PENDING_EXCEPTION->print();
1085 }
1086 CLEAR_PENDING_EXCEPTION;
1087 break;
1088 }
1089 // Check if another thread has beaten us during the Java calls.
1090 if (_compilers[1]->num_compiler_threads() != i) break;
1091 jobject thread_handle = JNIHandles::make_global(thread_oop);
1092 assert(compiler2_object(i) == NULL, "Old one must be released!");
1093 _compiler2_objects[i] = thread_handle;
1094 }
1095 #endif
1096 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1097 if (ct == NULL) break;
1098 _compilers[1]->set_num_compiler_threads(i + 1);
1099 if (TraceCompilerThreads) {
1100 ResourceMark rm;
1101 ThreadsListHandle tlh; // name() depends on the TLH.
1102 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1103 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
1104 ct->name(), (int)(available_memory/M), (int)(available_cc_np/M));
1105 }
1106 }
1107 }
1108
1109 if (_c1_compile_queue != NULL) {
1110 int old_c1_count = _compilers[0]->num_compiler_threads();
1111 int new_c1_count = MIN4(_c1_count,
1112 _c1_compile_queue->size() / 4,
1113 (int)(available_memory / (100*M)),
1114 (int)(available_cc_p / (128*K)));
1115
1116 for (int i = old_c1_count; i < new_c1_count; i++) {
1117 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1118 if (ct == NULL) break;
1119 _compilers[0]->set_num_compiler_threads(i + 1);
1120 if (TraceCompilerThreads) {
1121 ResourceMark rm;
1122 ThreadsListHandle tlh; // name() depends on the TLH.
1123 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1124 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
1125 ct->name(), (int)(available_memory/M), (int)(available_cc_p/M));
1126 }
1127 }
1128 }
1129
1130 CompileThread_lock->unlock();
1131 }
1132
1133
1134 /**
1135 * Set the methods on the stack as on_stack so that redefine classes doesn't
1136 * reclaim them. This method is executed at a safepoint.
1137 */
1138 void CompileBroker::mark_on_stack() {
1139 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1140 // Since we are at a safepoint, we do not need a lock to access
1141 // the compile queues.
1142 if (_c2_compile_queue != NULL) {
1143 _c2_compile_queue->mark_on_stack();
1144 }
1145 if (_c1_compile_queue != NULL) {
1146 _c1_compile_queue->mark_on_stack();
1147 }
1148 }
1149
1150 // ------------------------------------------------------------------
1151 // CompileBroker::compile_method
1152 //
1153 // Request compilation of a method.
1154 void CompileBroker::compile_method_base(const methodHandle& method,
1155 int osr_bci,
1156 int comp_level,
1157 const methodHandle& hot_method,
1158 int hot_count,
1159 CompileTask::CompileReason compile_reason,
1160 bool blocking,
1161 Thread* thread) {
1162 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1163 assert(method->method_holder()->is_instance_klass(),
1164 "sanity check");
1165 assert(!method->method_holder()->is_not_initialized(),
1166 "method holder must be initialized");
1167 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1168
1169 if (CIPrintRequests) {
1170 tty->print("request: ");
1171 method->print_short_name(tty);
1172 if (osr_bci != InvocationEntryBci) {
1173 tty->print(" osr_bci: %d", osr_bci);
1174 }
1175 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1176 if (!hot_method.is_null()) {
1177 tty->print(" hot: ");
1178 if (hot_method() != method()) {
1179 hot_method->print_short_name(tty);
1180 } else {
1181 tty->print("yes");
1182 }
1183 }
1184 tty->cr();
1185 }
1186
1187 // A request has been made for compilation. Before we do any
1188 // real work, check to see if the method has been compiled
1189 // in the meantime with a definitive result.
1190 if (compilation_is_complete(method, osr_bci, comp_level)) {
1191 return;
1192 }
1193
1194 #ifndef PRODUCT
1195 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1196 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1197 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1198 return;
1199 }
1200 }
1201 #endif
1202
1203 // If this method is already in the compile queue, then
1204 // we do not block the current thread.
1205 if (compilation_is_in_queue(method)) {
1206 // We may want to decay our counter a bit here to prevent
1207 // multiple denied requests for compilation. This is an
1208 // open compilation policy issue. Note: The other possibility,
1209 // in the case that this is a blocking compile request, is to have
1210 // all subsequent blocking requesters wait for completion of
1211 // ongoing compiles. Note that in this case we'll need a protocol
1212 // for freeing the associated compile tasks. [Or we could have
1213 // a single static monitor on which all these waiters sleep.]
1214 return;
1215 }
1216
1217 // Tiered policy requires MethodCounters to exist before adding a method to
1218 // the queue. Create if we don't have them yet.
1219 method->get_method_counters(thread);
1220
1221 // Outputs from the following MutexLocker block:
1222 CompileTask* task = NULL;
1223 CompileQueue* queue = compile_queue(comp_level);
1224
1225 // Acquire our lock.
1226 {
1227 MutexLocker locker(thread, MethodCompileQueue_lock);
1228
1229 // Make sure the method has not slipped into the queues since
1230 // last we checked; note that those checks were "fast bail-outs".
1231 // Here we need to be more careful, see 14012000 below.
1232 if (compilation_is_in_queue(method)) {
1233 return;
1234 }
1235
1236 // We need to check again to see if the compilation has
1237 // completed. A previous compilation may have registered
1238 // some result.
1239 if (compilation_is_complete(method, osr_bci, comp_level)) {
1240 return;
1241 }
1242
1243 // We now know that this compilation is not pending, complete,
1244 // or prohibited. Assign a compile_id to this compilation
1245 // and check to see if it is in our [Start..Stop) range.
1246 int compile_id = assign_compile_id(method, osr_bci);
1247 if (compile_id == 0) {
1248 // The compilation falls outside the allowed range.
1249 return;
1250 }
1251
1252 #if INCLUDE_JVMCI
1253 if (UseJVMCICompiler && blocking) {
1254 // Don't allow blocking compiles for requests triggered by JVMCI.
1255 if (thread->is_Compiler_thread()) {
1256 blocking = false;
1257 }
1258
1259 if (!UseJVMCINativeLibrary) {
1260 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1261 vframeStream vfst(JavaThread::cast(thread));
1262 for (; !vfst.at_end(); vfst.next()) {
1263 if (vfst.method()->is_static_initializer() ||
1264 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1265 vfst.method()->name() == vmSymbols::loadClass_name())) {
1266 blocking = false;
1267 break;
1268 }
1269 }
1270 }
1271
1272 // Don't allow blocking compilation requests to JVMCI
1273 // if JVMCI itself is not yet initialized
1274 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1275 blocking = false;
1276 }
1277
1278 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1279 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1280 // such as the DestroyJavaVM thread.
1281 if (JVMCI::in_shutdown()) {
1282 blocking = false;
1283 }
1284 }
1285 #endif // INCLUDE_JVMCI
1286
1287 // We will enter the compilation in the queue.
1288 // 14012000: Note that this sets the queued_for_compile bits in
1289 // the target method. We can now reason that a method cannot be
1290 // queued for compilation more than once, as follows:
1291 // Before a thread queues a task for compilation, it first acquires
1292 // the compile queue lock, then checks if the method's queued bits
1293 // are set or it has already been compiled. Thus there can not be two
1294 // instances of a compilation task for the same method on the
1295 // compilation queue. Consider now the case where the compilation
1296 // thread has already removed a task for that method from the queue
1297 // and is in the midst of compiling it. In this case, the
1298 // queued_for_compile bits must be set in the method (and these
1299 // will be visible to the current thread, since the bits were set
1300 // under protection of the compile queue lock, which we hold now.
1301 // When the compilation completes, the compiler thread first sets
1302 // the compilation result and then clears the queued_for_compile
1303 // bits. Neither of these actions are protected by a barrier (or done
1304 // under the protection of a lock), so the only guarantee we have
1305 // (on machines with TSO (Total Store Order)) is that these values
1306 // will update in that order. As a result, the only combinations of
1307 // these bits that the current thread will see are, in temporal order:
1308 // <RESULT, QUEUE> :
1309 // <0, 1> : in compile queue, but not yet compiled
1310 // <1, 1> : compiled but queue bit not cleared
1311 // <1, 0> : compiled and queue bit cleared
1312 // Because we first check the queue bits then check the result bits,
1313 // we are assured that we cannot introduce a duplicate task.
1314 // Note that if we did the tests in the reverse order (i.e. check
1315 // result then check queued bit), we could get the result bit before
1316 // the compilation completed, and the queue bit after the compilation
1317 // completed, and end up introducing a "duplicate" (redundant) task.
1318 // In that case, the compiler thread should first check if a method
1319 // has already been compiled before trying to compile it.
1320 // NOTE: in the event that there are multiple compiler threads and
1321 // there is de-optimization/recompilation, things will get hairy,
1322 // and in that case it's best to protect both the testing (here) of
1323 // these bits, and their updating (here and elsewhere) under a
1324 // common lock.
1325 task = create_compile_task(queue,
1326 compile_id, method,
1327 osr_bci, comp_level,
1328 hot_method, hot_count, compile_reason,
1329 blocking);
1330 }
1331
1332 if (blocking) {
1333 wait_for_completion(task);
1334 }
1335 }
1336
1337 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1338 int comp_level,
1339 const methodHandle& hot_method, int hot_count,
1340 CompileTask::CompileReason compile_reason,
1341 TRAPS) {
1342 // Do nothing if compilebroker is not initalized or compiles are submitted on level none
1343 if (!_initialized || comp_level == CompLevel_none) {
1344 return NULL;
1345 }
1346
1347 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1348 assert(comp != NULL, "Ensure we have a compiler");
1349
1350 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1351 // CompileBroker::compile_method can trap and can have pending aysnc exception.
1352 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1353 DirectivesStack::release(directive);
1354 return nm;
1355 }
1356
1357 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1358 int comp_level,
1359 const methodHandle& hot_method, int hot_count,
1360 CompileTask::CompileReason compile_reason,
1361 DirectiveSet* directive,
1362 TRAPS) {
1363
1364 // make sure arguments make sense
1365 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1366 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1367 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1368 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1369 // return quickly if possible
1370
1371 // lock, make sure that the compilation
1372 // isn't prohibited in a straightforward way.
1373 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1374 if (comp == NULL || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1375 return NULL;
1376 }
1377
1378 #if INCLUDE_JVMCI
1379 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1380 return NULL;
1381 }
1382 #endif
1383
1384 if (osr_bci == InvocationEntryBci) {
1385 // standard compilation
1386 CompiledMethod* method_code = method->code();
1387 if (method_code != NULL && method_code->is_nmethod()) {
1388 if (compilation_is_complete(method, osr_bci, comp_level)) {
1389 return (nmethod*) method_code;
1390 }
1391 }
1392 if (method->is_not_compilable(comp_level)) {
1393 return NULL;
1394 }
1395 } else {
1396 // osr compilation
1397 // We accept a higher level osr method
1398 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1399 if (nm != NULL) return nm;
1400 if (method->is_not_osr_compilable(comp_level)) return NULL;
1401 }
1402
1403 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1404 // some prerequisites that are compiler specific
1405 if (comp->is_c2() || comp->is_jvmci()) {
1406 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1407 // Resolve all classes seen in the signature of the method
1408 // we are compiling.
1409 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1410 }
1411
1412 // If the method is native, do the lookup in the thread requesting
1413 // the compilation. Native lookups can load code, which is not
1414 // permitted during compilation.
1415 //
1416 // Note: A native method implies non-osr compilation which is
1417 // checked with an assertion at the entry of this method.
1418 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1419 address adr = NativeLookup::lookup(method, THREAD);
1420 if (HAS_PENDING_EXCEPTION) {
1421 // In case of an exception looking up the method, we just forget
1422 // about it. The interpreter will kick-in and throw the exception.
1423 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1424 CLEAR_PENDING_EXCEPTION;
1425 return NULL;
1426 }
1427 assert(method->has_native_function(), "must have native code by now");
1428 }
1429
1430 // RedefineClasses() has replaced this method; just return
1431 if (method->is_old()) {
1432 return NULL;
1433 }
1434
1435 // JVMTI -- post_compile_event requires jmethod_id() that may require
1436 // a lock the compiling thread can not acquire. Prefetch it here.
1437 if (JvmtiExport::should_post_compiled_method_load()) {
1438 method->jmethod_id();
1439 }
1440
1441 // do the compilation
1442 if (method->is_native()) {
1443 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1444 #if defined(X86) && !defined(ZERO)
1445 // The following native methods:
1446 //
1447 // java.lang.Float.intBitsToFloat
1448 // java.lang.Float.floatToRawIntBits
1449 // java.lang.Double.longBitsToDouble
1450 // java.lang.Double.doubleToRawLongBits
1451 //
1452 // are called through the interpreter even if interpreter native stubs
1453 // are not preferred (i.e., calling through adapter handlers is preferred).
1454 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1455 // if the version of the methods from the native libraries is called.
1456 // As the interpreter and the C2-intrinsified version of the methods preserves
1457 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1458 if ((UseSSE >= 1 &&
1459 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1460 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1461 (UseSSE >= 2 &&
1462 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1463 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1464 return NULL;
1465 }
1466 #endif // X86 && !ZERO
1467
1468 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1469 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1470 //
1471 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1472 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1473 AdapterHandlerLibrary::create_native_wrapper(method);
1474 } else {
1475 return NULL;
1476 }
1477 } else {
1478 // If the compiler is shut off due to code cache getting full
1479 // fail out now so blocking compiles dont hang the java thread
1480 if (!should_compile_new_jobs()) {
1481 return NULL;
1482 }
1483 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1484 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1485 }
1486
1487 // return requested nmethod
1488 // We accept a higher level osr method
1489 if (osr_bci == InvocationEntryBci) {
1490 CompiledMethod* code = method->code();
1491 if (code == NULL) {
1492 return (nmethod*) code;
1493 } else {
1494 return code->as_nmethod_or_null();
1495 }
1496 }
1497 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1498 }
1499
1500
1501 // ------------------------------------------------------------------
1502 // CompileBroker::compilation_is_complete
1503 //
1504 // See if compilation of this method is already complete.
1505 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1506 int osr_bci,
1507 int comp_level) {
1508 bool is_osr = (osr_bci != standard_entry_bci);
1509 if (is_osr) {
1510 if (method->is_not_osr_compilable(comp_level)) {
1511 return true;
1512 } else {
1513 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1514 return (result != NULL);
1515 }
1516 } else {
1517 if (method->is_not_compilable(comp_level)) {
1518 return true;
1519 } else {
1520 CompiledMethod* result = method->code();
1521 if (result == NULL) return false;
1522 return comp_level == result->comp_level();
1523 }
1524 }
1525 }
1526
1527
1528 /**
1529 * See if this compilation is already requested.
1530 *
1531 * Implementation note: there is only a single "is in queue" bit
1532 * for each method. This means that the check below is overly
1533 * conservative in the sense that an osr compilation in the queue
1534 * will block a normal compilation from entering the queue (and vice
1535 * versa). This can be remedied by a full queue search to disambiguate
1536 * cases. If it is deemed profitable, this may be done.
1537 */
1538 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1539 return method->queued_for_compilation();
1540 }
1541
1542 // ------------------------------------------------------------------
1543 // CompileBroker::compilation_is_prohibited
1544 //
1545 // See if this compilation is not allowed.
1546 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1547 bool is_native = method->is_native();
1548 // Some compilers may not support the compilation of natives.
1549 AbstractCompiler *comp = compiler(comp_level);
1550 if (is_native && (!CICompileNatives || comp == NULL)) {
1551 method->set_not_compilable_quietly("native methods not supported", comp_level);
1552 return true;
1553 }
1554
1555 bool is_osr = (osr_bci != standard_entry_bci);
1556 // Some compilers may not support on stack replacement.
1557 if (is_osr && (!CICompileOSR || comp == NULL)) {
1558 method->set_not_osr_compilable("OSR not supported", comp_level);
1559 return true;
1560 }
1561
1562 // The method may be explicitly excluded by the user.
1563 double scale;
1564 if (excluded || (CompilerOracle::has_option_value(method, CompileCommand::CompileThresholdScaling, scale) && scale == 0)) {
1565 bool quietly = CompilerOracle::be_quiet();
1566 if (PrintCompilation && !quietly) {
1567 // This does not happen quietly...
1568 ResourceMark rm;
1569 tty->print("### Excluding %s:%s",
1570 method->is_native() ? "generation of native wrapper" : "compile",
1571 (method->is_static() ? " static" : ""));
1572 method->print_short_name(tty);
1573 tty->cr();
1574 }
1575 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1576 }
1577
1578 return false;
1579 }
1580
1581 /**
1582 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1583 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1584 * The function also allows to generate separate compilation IDs for OSR compilations.
1585 */
1586 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1587 #ifdef ASSERT
1588 bool is_osr = (osr_bci != standard_entry_bci);
1589 int id;
1590 if (method->is_native()) {
1591 assert(!is_osr, "can't be osr");
1592 // Adapters, native wrappers and method handle intrinsics
1593 // should be generated always.
1594 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1595 } else if (CICountOSR && is_osr) {
1596 id = Atomic::add(&_osr_compilation_id, 1);
1597 if (CIStartOSR <= id && id < CIStopOSR) {
1598 return id;
1599 }
1600 } else {
1601 id = Atomic::add(&_compilation_id, 1);
1602 if (CIStart <= id && id < CIStop) {
1603 return id;
1604 }
1605 }
1606
1607 // Method was not in the appropriate compilation range.
1608 method->set_not_compilable_quietly("Not in requested compile id range");
1609 return 0;
1610 #else
1611 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1612 // only _compilation_id is incremented.
1613 return Atomic::add(&_compilation_id, 1);
1614 #endif
1615 }
1616
1617 // ------------------------------------------------------------------
1618 // CompileBroker::assign_compile_id_unlocked
1619 //
1620 // Public wrapper for assign_compile_id that acquires the needed locks
1621 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1622 MutexLocker locker(thread, MethodCompileQueue_lock);
1623 return assign_compile_id(method, osr_bci);
1624 }
1625
1626 // ------------------------------------------------------------------
1627 // CompileBroker::create_compile_task
1628 //
1629 // Create a CompileTask object representing the current request for
1630 // compilation. Add this task to the queue.
1631 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1632 int compile_id,
1633 const methodHandle& method,
1634 int osr_bci,
1635 int comp_level,
1636 const methodHandle& hot_method,
1637 int hot_count,
1638 CompileTask::CompileReason compile_reason,
1639 bool blocking) {
1640 CompileTask* new_task = CompileTask::allocate();
1641 new_task->initialize(compile_id, method, osr_bci, comp_level,
1642 hot_method, hot_count, compile_reason,
1643 blocking);
1644 queue->add(new_task);
1645 return new_task;
1646 }
1647
1648 #if INCLUDE_JVMCI
1649 // The number of milliseconds to wait before checking if
1650 // JVMCI compilation has made progress.
1651 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1652
1653 // The number of JVMCI compilation progress checks that must fail
1654 // before unblocking a thread waiting for a blocking compilation.
1655 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1656
1657 /**
1658 * Waits for a JVMCI compiler to complete a given task. This thread
1659 * waits until either the task completes or it sees no JVMCI compilation
1660 * progress for N consecutive milliseconds where N is
1661 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1662 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1663 *
1664 * @return true if this thread needs to free/recycle the task
1665 */
1666 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1667 assert(UseJVMCICompiler, "sanity");
1668 MonitorLocker ml(thread, task->lock());
1669 int progress_wait_attempts = 0;
1670 jint thread_jvmci_compilation_ticks = 0;
1671 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1672 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1673 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1674 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1675
1676 bool progress;
1677 if (jvmci_compile_state != NULL) {
1678 jint ticks = jvmci_compile_state->compilation_ticks();
1679 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1680 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1681 thread_jvmci_compilation_ticks = ticks;
1682 } else {
1683 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1684 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1685 // compilation ticks to determine whether JVMCI compilation
1686 // is still making progress through the JVMCI compiler queue.
1687 jint ticks = jvmci->global_compilation_ticks();
1688 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1689 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1690 global_jvmci_compilation_ticks = ticks;
1691 }
1692
1693 if (!progress) {
1694 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1695 if (PrintCompilation) {
1696 task->print(tty, "wait for blocking compilation timed out");
1697 }
1698 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1699 break;
1700 }
1701 } else {
1702 progress_wait_attempts = 0;
1703 }
1704 }
1705 task->clear_waiter();
1706 return task->is_complete();
1707 }
1708 #endif
1709
1710 /**
1711 * Wait for the compilation task to complete.
1712 */
1713 void CompileBroker::wait_for_completion(CompileTask* task) {
1714 if (CIPrintCompileQueue) {
1715 ttyLocker ttyl;
1716 tty->print_cr("BLOCKING FOR COMPILE");
1717 }
1718
1719 assert(task->is_blocking(), "can only wait on blocking task");
1720
1721 JavaThread* thread = JavaThread::current();
1722
1723 methodHandle method(thread, task->method());
1724 bool free_task;
1725 #if INCLUDE_JVMCI
1726 AbstractCompiler* comp = compiler(task->comp_level());
1727 if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
1728 // It may return before compilation is completed.
1729 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1730 } else
1731 #endif
1732 {
1733 MonitorLocker ml(thread, task->lock());
1734 free_task = true;
1735 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1736 ml.wait();
1737 }
1738 }
1739
1740 if (free_task) {
1741 if (is_compilation_disabled_forever()) {
1742 CompileTask::free(task);
1743 return;
1744 }
1745
1746 // It is harmless to check this status without the lock, because
1747 // completion is a stable property (until the task object is recycled).
1748 assert(task->is_complete(), "Compilation should have completed");
1749 assert(task->code_handle() == NULL, "must be reset");
1750
1751 // By convention, the waiter is responsible for recycling a
1752 // blocking CompileTask. Since there is only one waiter ever
1753 // waiting on a CompileTask, we know that no one else will
1754 // be using this CompileTask; we can free it.
1755 CompileTask::free(task);
1756 }
1757 }
1758
1759 /**
1760 * Initialize compiler thread(s) + compiler object(s). The postcondition
1761 * of this function is that the compiler runtimes are initialized and that
1762 * compiler threads can start compiling.
1763 */
1764 bool CompileBroker::init_compiler_runtime() {
1765 CompilerThread* thread = CompilerThread::current();
1766 AbstractCompiler* comp = thread->compiler();
1767 // Final sanity check - the compiler object must exist
1768 guarantee(comp != NULL, "Compiler object must exist");
1769
1770 {
1771 // Must switch to native to allocate ci_env
1772 ThreadToNativeFromVM ttn(thread);
1773 ciEnv ci_env((CompileTask*)NULL);
1774 // Cache Jvmti state
1775 ci_env.cache_jvmti_state();
1776 // Cache DTrace flags
1777 ci_env.cache_dtrace_flags();
1778
1779 // Switch back to VM state to do compiler initialization
1780 ThreadInVMfromNative tv(thread);
1781
1782 // Perform per-thread and global initializations
1783 comp->initialize();
1784 }
1785
1786 if (comp->is_failed()) {
1787 disable_compilation_forever();
1788 // If compiler initialization failed, no compiler thread that is specific to a
1789 // particular compiler runtime will ever start to compile methods.
1790 shutdown_compiler_runtime(comp, thread);
1791 return false;
1792 }
1793
1794 // C1 specific check
1795 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1796 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1797 return false;
1798 }
1799
1800 return true;
1801 }
1802
1803 /**
1804 * If C1 and/or C2 initialization failed, we shut down all compilation.
1805 * We do this to keep things simple. This can be changed if it ever turns
1806 * out to be a problem.
1807 */
1808 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1809 // Free buffer blob, if allocated
1810 if (thread->get_buffer_blob() != NULL) {
1811 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1812 CodeCache::free(thread->get_buffer_blob());
1813 }
1814
1815 if (comp->should_perform_shutdown()) {
1816 // There are two reasons for shutting down the compiler
1817 // 1) compiler runtime initialization failed
1818 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1819 warning("%s initialization failed. Shutting down all compilers", comp->name());
1820
1821 // Only one thread per compiler runtime object enters here
1822 // Set state to shut down
1823 comp->set_shut_down();
1824
1825 // Delete all queued compilation tasks to make compiler threads exit faster.
1826 if (_c1_compile_queue != NULL) {
1827 _c1_compile_queue->free_all();
1828 }
1829
1830 if (_c2_compile_queue != NULL) {
1831 _c2_compile_queue->free_all();
1832 }
1833
1834 // Set flags so that we continue execution with using interpreter only.
1835 UseCompiler = false;
1836 UseInterpreter = true;
1837
1838 // We could delete compiler runtimes also. However, there are references to
1839 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1840 // fail. This can be done later if necessary.
1841 }
1842 }
1843
1844 /**
1845 * Helper function to create new or reuse old CompileLog.
1846 */
1847 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1848 if (!LogCompilation) return NULL;
1849
1850 AbstractCompiler *compiler = ct->compiler();
1851 bool c1 = compiler->is_c1();
1852 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1853 assert(compiler_objects != NULL, "must be initialized at this point");
1854 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1855 assert(logs != NULL, "must be initialized at this point");
1856 int count = c1 ? _c1_count : _c2_count;
1857
1858 // Find Compiler number by its threadObj.
1859 oop compiler_obj = ct->threadObj();
1860 int compiler_number = 0;
1861 bool found = false;
1862 for (; compiler_number < count; compiler_number++) {
1863 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1864 found = true;
1865 break;
1866 }
1867 }
1868 assert(found, "Compiler must exist at this point");
1869
1870 // Determine pointer for this thread's log.
1871 CompileLog** log_ptr = &logs[compiler_number];
1872
1873 // Return old one if it exists.
1874 CompileLog* log = *log_ptr;
1875 if (log != NULL) {
1876 ct->init_log(log);
1877 return log;
1878 }
1879
1880 // Create a new one and remember it.
1881 init_compiler_thread_log();
1882 log = ct->log();
1883 *log_ptr = log;
1884 return log;
1885 }
1886
1887 // ------------------------------------------------------------------
1888 // CompileBroker::compiler_thread_loop
1889 //
1890 // The main loop run by a CompilerThread.
1891 void CompileBroker::compiler_thread_loop() {
1892 CompilerThread* thread = CompilerThread::current();
1893 CompileQueue* queue = thread->queue();
1894 // For the thread that initializes the ciObjectFactory
1895 // this resource mark holds all the shared objects
1896 ResourceMark rm;
1897
1898 // First thread to get here will initialize the compiler interface
1899
1900 {
1901 ASSERT_IN_VM;
1902 MutexLocker only_one (thread, CompileThread_lock);
1903 if (!ciObjectFactory::is_initialized()) {
1904 ciObjectFactory::initialize();
1905 }
1906 }
1907
1908 // Open a log.
1909 CompileLog* log = get_log(thread);
1910 if (log != NULL) {
1911 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1912 thread->name(),
1913 os::current_thread_id(),
1914 os::current_process_id());
1915 log->stamp();
1916 log->end_elem();
1917 }
1918
1919 // If compiler thread/runtime initialization fails, exit the compiler thread
1920 if (!init_compiler_runtime()) {
1921 return;
1922 }
1923
1924 thread->start_idle_timer();
1925
1926 // Poll for new compilation tasks as long as the JVM runs. Compilation
1927 // should only be disabled if something went wrong while initializing the
1928 // compiler runtimes. This, in turn, should not happen. The only known case
1929 // when compiler runtime initialization fails is if there is not enough free
1930 // space in the code cache to generate the necessary stubs, etc.
1931 while (!is_compilation_disabled_forever()) {
1932 // We need this HandleMark to avoid leaking VM handles.
1933 HandleMark hm(thread);
1934
1935 CompileTask* task = queue->get();
1936 if (task == NULL) {
1937 if (UseDynamicNumberOfCompilerThreads) {
1938 // Access compiler_count under lock to enforce consistency.
1939 MutexLocker only_one(CompileThread_lock);
1940 if (can_remove(thread, true)) {
1941 if (TraceCompilerThreads) {
1942 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1943 thread->name(), thread->idle_time_millis());
1944 }
1945 // Free buffer blob, if allocated
1946 if (thread->get_buffer_blob() != NULL) {
1947 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1948 CodeCache::free(thread->get_buffer_blob());
1949 }
1950 return; // Stop this thread.
1951 }
1952 }
1953 } else {
1954 // Assign the task to the current thread. Mark this compilation
1955 // thread as active for the profiler.
1956 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1957 // occurs after fetching the compile task off the queue.
1958 CompileTaskWrapper ctw(task);
1959 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1960 task->set_code_handle(&result_handle);
1961 methodHandle method(thread, task->method());
1962
1963 // Never compile a method if breakpoints are present in it
1964 if (method()->number_of_breakpoints() == 0) {
1965 // Compile the method.
1966 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1967 invoke_compiler_on_method(task);
1968 thread->start_idle_timer();
1969 } else {
1970 // After compilation is disabled, remove remaining methods from queue
1971 method->clear_queued_for_compilation();
1972 task->set_failure_reason("compilation is disabled");
1973 }
1974 } else {
1975 task->set_failure_reason("breakpoints are present");
1976 }
1977
1978 if (UseDynamicNumberOfCompilerThreads) {
1979 possibly_add_compiler_threads(thread);
1980 assert(!thread->has_pending_exception(), "should have been handled");
1981 }
1982 }
1983 }
1984
1985 // Shut down compiler runtime
1986 shutdown_compiler_runtime(thread->compiler(), thread);
1987 }
1988
1989 // ------------------------------------------------------------------
1990 // CompileBroker::init_compiler_thread_log
1991 //
1992 // Set up state required by +LogCompilation.
1993 void CompileBroker::init_compiler_thread_log() {
1994 CompilerThread* thread = CompilerThread::current();
1995 char file_name[4*K];
1996 FILE* fp = NULL;
1997 intx thread_id = os::current_thread_id();
1998 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1999 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
2000 if (dir == NULL) {
2001 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
2002 thread_id, os::current_process_id());
2003 } else {
2004 jio_snprintf(file_name, sizeof(file_name),
2005 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
2006 os::file_separator(), thread_id, os::current_process_id());
2007 }
2008
2009 fp = os::fopen(file_name, "wt");
2010 if (fp != NULL) {
2011 if (LogCompilation && Verbose) {
2012 tty->print_cr("Opening compilation log %s", file_name);
2013 }
2014 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
2015 if (log == NULL) {
2016 fclose(fp);
2017 return;
2018 }
2019 thread->init_log(log);
2020
2021 if (xtty != NULL) {
2022 ttyLocker ttyl;
2023 // Record any per thread log files
2024 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2025 }
2026 return;
2027 }
2028 }
2029 warning("Cannot open log file: %s", file_name);
2030 }
2031
2032 void CompileBroker::log_metaspace_failure() {
2033 const char* message = "some methods may not be compiled because metaspace "
2034 "is out of memory";
2035 if (_compilation_log != NULL) {
2036 _compilation_log->log_metaspace_failure(message);
2037 }
2038 if (PrintCompilation) {
2039 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2040 }
2041 }
2042
2043
2044 // ------------------------------------------------------------------
2045 // CompileBroker::set_should_block
2046 //
2047 // Set _should_block.
2048 // Call this from the VM, with Threads_lock held and a safepoint requested.
2049 void CompileBroker::set_should_block() {
2050 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2051 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2052 #ifndef PRODUCT
2053 if (PrintCompilation && (Verbose || WizardMode))
2054 tty->print_cr("notifying compiler thread pool to block");
2055 #endif
2056 _should_block = true;
2057 }
2058
2059 // ------------------------------------------------------------------
2060 // CompileBroker::maybe_block
2061 //
2062 // Call this from the compiler at convenient points, to poll for _should_block.
2063 void CompileBroker::maybe_block() {
2064 if (_should_block) {
2065 #ifndef PRODUCT
2066 if (PrintCompilation && (Verbose || WizardMode))
2067 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2068 #endif
2069 ThreadInVMfromNative tivfn(JavaThread::current());
2070 }
2071 }
2072
2073 // wrapper for CodeCache::print_summary()
2074 static void codecache_print(bool detailed)
2075 {
2076 ResourceMark rm;
2077 stringStream s;
2078 // Dump code cache into a buffer before locking the tty,
2079 {
2080 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2081 CodeCache::print_summary(&s, detailed);
2082 }
2083 ttyLocker ttyl;
2084 tty->print("%s", s.as_string());
2085 }
2086
2087 // wrapper for CodeCache::print_summary() using outputStream
2088 static void codecache_print(outputStream* out, bool detailed) {
2089 ResourceMark rm;
2090 stringStream s;
2091
2092 // Dump code cache into a buffer
2093 {
2094 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2095 CodeCache::print_summary(&s, detailed);
2096 }
2097
2098 char* remaining_log = s.as_string();
2099 while (*remaining_log != '\0') {
2100 char* eol = strchr(remaining_log, '\n');
2101 if (eol == NULL) {
2102 out->print_cr("%s", remaining_log);
2103 remaining_log = remaining_log + strlen(remaining_log);
2104 } else {
2105 *eol = '\0';
2106 out->print_cr("%s", remaining_log);
2107 remaining_log = eol + 1;
2108 }
2109 }
2110 }
2111
2112 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env,
2113 int compilable, const char* failure_reason) {
2114 if (success) {
2115 task->mark_success();
2116 if (ci_env != NULL) {
2117 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
2118 }
2119 if (_compilation_log != NULL) {
2120 nmethod* code = task->code();
2121 if (code != NULL) {
2122 _compilation_log->log_nmethod(thread, code);
2123 }
2124 }
2125 } else if (AbortVMOnCompilationFailure) {
2126 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2127 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2128 }
2129 if (compilable == ciEnv::MethodCompilable_never) {
2130 fatal("Never compilable: %s", failure_reason);
2131 }
2132 }
2133 }
2134
2135 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2136 assert(task != NULL, "invariant");
2137 CompilerEvent::CompilationEvent::post(event,
2138 task->compile_id(),
2139 task->compiler()->type(),
2140 task->method(),
2141 task->comp_level(),
2142 task->is_success(),
2143 task->osr_bci() != CompileBroker::standard_entry_bci,
2144 (task->code() == NULL) ? 0 : task->code()->total_size(),
2145 task->num_inlined_bytecodes());
2146 }
2147
2148 int DirectivesStack::_depth = 0;
2149 CompilerDirectives* DirectivesStack::_top = NULL;
2150 CompilerDirectives* DirectivesStack::_bottom = NULL;
2151
2152 // ------------------------------------------------------------------
2153 // CompileBroker::invoke_compiler_on_method
2154 //
2155 // Compile a method.
2156 //
2157 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2158 task->print_ul();
2159 if (PrintCompilation) {
2160 ResourceMark rm;
2161 task->print_tty();
2162 }
2163 elapsedTimer time;
2164
2165 CompilerThread* thread = CompilerThread::current();
2166 ResourceMark rm(thread);
2167
2168 if (LogEvents) {
2169 _compilation_log->log_compile(thread, task);
2170 }
2171
2172 // Common flags.
2173 uint compile_id = task->compile_id();
2174 int osr_bci = task->osr_bci();
2175 bool is_osr = (osr_bci != standard_entry_bci);
2176 bool should_log = (thread->log() != NULL);
2177 bool should_break = false;
2178 const int task_level = task->comp_level();
2179 AbstractCompiler* comp = task->compiler();
2180
2181 DirectiveSet* directive;
2182 {
2183 // create the handle inside it's own block so it can't
2184 // accidentally be referenced once the thread transitions to
2185 // native. The NoHandleMark before the transition should catch
2186 // any cases where this occurs in the future.
2187 methodHandle method(thread, task->method());
2188 assert(!method->is_native(), "no longer compile natives");
2189
2190 // Look up matching directives
2191 directive = DirectivesStack::getMatchingDirective(method, comp);
2192
2193 // Update compile information when using perfdata.
2194 if (UsePerfData) {
2195 update_compile_perf_data(thread, method, is_osr);
2196 }
2197
2198 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2199 }
2200
2201 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2202 if (should_log && !directive->LogOption) {
2203 should_log = false;
2204 }
2205
2206 // Allocate a new set of JNI handles.
2207 JNIHandleMark jhm(thread);
2208 Method* target_handle = task->method();
2209 int compilable = ciEnv::MethodCompilable;
2210 const char* failure_reason = NULL;
2211 bool failure_reason_on_C_heap = false;
2212 const char* retry_message = NULL;
2213
2214 #if INCLUDE_JVMCI
2215 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2216 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2217
2218 TraceTime t1("compilation", &time);
2219 EventCompilation event;
2220 JVMCICompileState compile_state(task, jvmci);
2221 JVMCIRuntime *runtime = NULL;
2222
2223 if (JVMCI::in_shutdown()) {
2224 failure_reason = "in JVMCI shutdown";
2225 retry_message = "not retryable";
2226 compilable = ciEnv::MethodCompilable_never;
2227 } else if (compile_state.target_method_is_old()) {
2228 // Skip redefined methods
2229 failure_reason = "redefined method";
2230 retry_message = "not retryable";
2231 compilable = ciEnv::MethodCompilable_never;
2232 } else {
2233 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2234 methodHandle method(thread, target_handle);
2235 runtime = env.runtime();
2236 runtime->compile_method(&env, jvmci, method, osr_bci);
2237
2238 failure_reason = compile_state.failure_reason();
2239 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2240 if (!compile_state.retryable()) {
2241 retry_message = "not retryable";
2242 compilable = ciEnv::MethodCompilable_not_at_tier;
2243 }
2244 if (task->code() == NULL) {
2245 assert(failure_reason != NULL, "must specify failure_reason");
2246 }
2247 }
2248 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason);
2249 if (event.should_commit()) {
2250 post_compilation_event(event, task);
2251 }
2252
2253 } else
2254 #endif // INCLUDE_JVMCI
2255 {
2256 NoHandleMark nhm;
2257 ThreadToNativeFromVM ttn(thread);
2258
2259 ciEnv ci_env(task);
2260 if (should_break) {
2261 ci_env.set_break_at_compile(true);
2262 }
2263 if (should_log) {
2264 ci_env.set_log(thread->log());
2265 }
2266 assert(thread->env() == &ci_env, "set by ci_env");
2267 // The thread-env() field is cleared in ~CompileTaskWrapper.
2268
2269 // Cache Jvmti state
2270 bool method_is_old = ci_env.cache_jvmti_state();
2271
2272 // Skip redefined methods
2273 if (method_is_old) {
2274 ci_env.record_method_not_compilable("redefined method", true);
2275 }
2276
2277 // Cache DTrace flags
2278 ci_env.cache_dtrace_flags();
2279
2280 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2281
2282 TraceTime t1("compilation", &time);
2283 EventCompilation event;
2284
2285 if (comp == NULL) {
2286 ci_env.record_method_not_compilable("no compiler");
2287 } else if (!ci_env.failing()) {
2288 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2289 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2290 while (WhiteBox::compilation_locked) {
2291 locker.wait();
2292 }
2293 }
2294 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2295
2296 /* Repeat compilation without installing code for profiling purposes */
2297 int repeat_compilation_count = directive->RepeatCompilationOption;
2298 while (repeat_compilation_count > 0) {
2299 task->print_ul("NO CODE INSTALLED");
2300 comp->compile_method(&ci_env, target, osr_bci, false , directive);
2301 repeat_compilation_count--;
2302 }
2303 }
2304
2305 if (!ci_env.failing() && task->code() == NULL) {
2306 //assert(false, "compiler should always document failure");
2307 // The compiler elected, without comment, not to register a result.
2308 // Do not attempt further compilations of this method.
2309 ci_env.record_method_not_compilable("compile failed");
2310 }
2311
2312 // Copy this bit to the enclosing block:
2313 compilable = ci_env.compilable();
2314
2315 if (ci_env.failing()) {
2316 failure_reason = ci_env.failure_reason();
2317 retry_message = ci_env.retry_message();
2318 ci_env.report_failure(failure_reason);
2319 }
2320
2321 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason);
2322 if (event.should_commit()) {
2323 post_compilation_event(event, task);
2324 }
2325 }
2326
2327 if (failure_reason != NULL) {
2328 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2329 if (_compilation_log != NULL) {
2330 _compilation_log->log_failure(thread, task, failure_reason, retry_message);
2331 }
2332 if (PrintCompilation) {
2333 FormatBufferResource msg = retry_message != NULL ?
2334 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2335 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2336 task->print(tty, msg);
2337 }
2338 }
2339
2340 methodHandle method(thread, task->method());
2341
2342 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2343
2344 collect_statistics(thread, time, task);
2345
2346 nmethod* nm = task->code();
2347 if (nm != NULL) {
2348 nm->maybe_print_nmethod(directive);
2349 }
2350 DirectivesStack::release(directive);
2351
2352 if (PrintCompilation && PrintCompilation2) {
2353 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2354 tty->print("%4d ", compile_id); // print compilation number
2355 tty->print("%s ", (is_osr ? "%" : " "));
2356 if (task->code() != NULL) {
2357 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2358 }
2359 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2360 }
2361
2362 Log(compilation, codecache) log;
2363 if (log.is_debug()) {
2364 LogStream ls(log.debug());
2365 codecache_print(&ls, /* detailed= */ false);
2366 }
2367 if (PrintCodeCacheOnCompilation) {
2368 codecache_print(/* detailed= */ false);
2369 }
2370 // Disable compilation, if required.
2371 switch (compilable) {
2372 case ciEnv::MethodCompilable_never:
2373 if (is_osr)
2374 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2375 else
2376 method->set_not_compilable_quietly("MethodCompilable_never");
2377 break;
2378 case ciEnv::MethodCompilable_not_at_tier:
2379 if (is_osr)
2380 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2381 else
2382 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2383 break;
2384 }
2385
2386 // Note that the queued_for_compilation bits are cleared without
2387 // protection of a mutex. [They were set by the requester thread,
2388 // when adding the task to the compile queue -- at which time the
2389 // compile queue lock was held. Subsequently, we acquired the compile
2390 // queue lock to get this task off the compile queue; thus (to belabour
2391 // the point somewhat) our clearing of the bits must be occurring
2392 // only after the setting of the bits. See also 14012000 above.
2393 method->clear_queued_for_compilation();
2394 }
2395
2396 /**
2397 * The CodeCache is full. Print warning and disable compilation.
2398 * Schedule code cache cleaning so compilation can continue later.
2399 * This function needs to be called only from CodeCache::allocate(),
2400 * since we currently handle a full code cache uniformly.
2401 */
2402 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2403 UseInterpreter = true;
2404 if (UseCompiler || AlwaysCompileLoopMethods ) {
2405 if (xtty != NULL) {
2406 ResourceMark rm;
2407 stringStream s;
2408 // Dump code cache state into a buffer before locking the tty,
2409 // because log_state() will use locks causing lock conflicts.
2410 CodeCache::log_state(&s);
2411 // Lock to prevent tearing
2412 ttyLocker ttyl;
2413 xtty->begin_elem("code_cache_full");
2414 xtty->print("%s", s.as_string());
2415 xtty->stamp();
2416 xtty->end_elem();
2417 }
2418
2419 #ifndef PRODUCT
2420 if (ExitOnFullCodeCache) {
2421 codecache_print(/* detailed= */ true);
2422 before_exit(JavaThread::current());
2423 exit_globals(); // will delete tty
2424 vm_direct_exit(1);
2425 }
2426 #endif
2427 if (UseCodeCacheFlushing) {
2428 // Since code cache is full, immediately stop new compiles
2429 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2430 NMethodSweeper::log_sweep("disable_compiler");
2431 }
2432 } else {
2433 disable_compilation_forever();
2434 }
2435
2436 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2437 }
2438 }
2439
2440 // ------------------------------------------------------------------
2441 // CompileBroker::update_compile_perf_data
2442 //
2443 // Record this compilation for debugging purposes.
2444 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2445 ResourceMark rm;
2446 char* method_name = method->name()->as_C_string();
2447 char current_method[CompilerCounters::cmname_buffer_length];
2448 size_t maxLen = CompilerCounters::cmname_buffer_length;
2449
2450 const char* class_name = method->method_holder()->name()->as_C_string();
2451
2452 size_t s1len = strlen(class_name);
2453 size_t s2len = strlen(method_name);
2454
2455 // check if we need to truncate the string
2456 if (s1len + s2len + 2 > maxLen) {
2457
2458 // the strategy is to lop off the leading characters of the
2459 // class name and the trailing characters of the method name.
2460
2461 if (s2len + 2 > maxLen) {
2462 // lop of the entire class name string, let snprintf handle
2463 // truncation of the method name.
2464 class_name += s1len; // null string
2465 }
2466 else {
2467 // lop off the extra characters from the front of the class name
2468 class_name += ((s1len + s2len + 2) - maxLen);
2469 }
2470 }
2471
2472 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2473
2474 int last_compile_type = normal_compile;
2475 if (CICountOSR && is_osr) {
2476 last_compile_type = osr_compile;
2477 } else if (CICountNative && method->is_native()) {
2478 last_compile_type = native_compile;
2479 }
2480
2481 CompilerCounters* counters = thread->counters();
2482 counters->set_current_method(current_method);
2483 counters->set_compile_type((jlong) last_compile_type);
2484 }
2485
2486 // ------------------------------------------------------------------
2487 // CompileBroker::collect_statistics
2488 //
2489 // Collect statistics about the compilation.
2490
2491 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2492 bool success = task->is_success();
2493 methodHandle method (thread, task->method());
2494 uint compile_id = task->compile_id();
2495 bool is_osr = (task->osr_bci() != standard_entry_bci);
2496 const int comp_level = task->comp_level();
2497 nmethod* code = task->code();
2498 CompilerCounters* counters = thread->counters();
2499
2500 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2501 MutexLocker locker(CompileStatistics_lock);
2502
2503 // _perf variables are production performance counters which are
2504 // updated regardless of the setting of the CITime and CITimeEach flags
2505 //
2506
2507 // account all time, including bailouts and failures in this counter;
2508 // C1 and C2 counters are counting both successful and unsuccessful compiles
2509 _t_total_compilation.add(time);
2510
2511 if (!success) {
2512 _total_bailout_count++;
2513 if (UsePerfData) {
2514 _perf_last_failed_method->set_value(counters->current_method());
2515 _perf_last_failed_type->set_value(counters->compile_type());
2516 _perf_total_bailout_count->inc();
2517 }
2518 _t_bailedout_compilation.add(time);
2519 } else if (code == NULL) {
2520 if (UsePerfData) {
2521 _perf_last_invalidated_method->set_value(counters->current_method());
2522 _perf_last_invalidated_type->set_value(counters->compile_type());
2523 _perf_total_invalidated_count->inc();
2524 }
2525 _total_invalidated_count++;
2526 _t_invalidated_compilation.add(time);
2527 } else {
2528 // Compilation succeeded
2529
2530 // update compilation ticks - used by the implementation of
2531 // java.lang.management.CompilationMXBean
2532 _perf_total_compilation->inc(time.ticks());
2533 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2534
2535 if (CITime) {
2536 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2537 if (is_osr) {
2538 _t_osr_compilation.add(time);
2539 _sum_osr_bytes_compiled += bytes_compiled;
2540 } else {
2541 _t_standard_compilation.add(time);
2542 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2543 }
2544
2545 // Collect statistic per compilation level
2546 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2547 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2548 if (is_osr) {
2549 stats->_osr.update(time, bytes_compiled);
2550 } else {
2551 stats->_standard.update(time, bytes_compiled);
2552 }
2553 stats->_nmethods_size += code->total_size();
2554 stats->_nmethods_code_size += code->insts_size();
2555 } else {
2556 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2557 }
2558
2559 // Collect statistic per compiler
2560 AbstractCompiler* comp = compiler(comp_level);
2561 if (comp) {
2562 CompilerStatistics* stats = comp->stats();
2563 if (is_osr) {
2564 stats->_osr.update(time, bytes_compiled);
2565 } else {
2566 stats->_standard.update(time, bytes_compiled);
2567 }
2568 stats->_nmethods_size += code->total_size();
2569 stats->_nmethods_code_size += code->insts_size();
2570 } else { // if (!comp)
2571 assert(false, "Compiler object must exist");
2572 }
2573 }
2574
2575 if (UsePerfData) {
2576 // save the name of the last method compiled
2577 _perf_last_method->set_value(counters->current_method());
2578 _perf_last_compile_type->set_value(counters->compile_type());
2579 _perf_last_compile_size->set_value(method->code_size() +
2580 task->num_inlined_bytecodes());
2581 if (is_osr) {
2582 _perf_osr_compilation->inc(time.ticks());
2583 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2584 } else {
2585 _perf_standard_compilation->inc(time.ticks());
2586 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2587 }
2588 }
2589
2590 if (CITimeEach) {
2591 double compile_time = time.seconds();
2592 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2593 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2594 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2595 }
2596
2597 // Collect counts of successful compilations
2598 _sum_nmethod_size += code->total_size();
2599 _sum_nmethod_code_size += code->insts_size();
2600 _total_compile_count++;
2601
2602 if (UsePerfData) {
2603 _perf_sum_nmethod_size->inc( code->total_size());
2604 _perf_sum_nmethod_code_size->inc(code->insts_size());
2605 _perf_total_compile_count->inc();
2606 }
2607
2608 if (is_osr) {
2609 if (UsePerfData) _perf_total_osr_compile_count->inc();
2610 _total_osr_compile_count++;
2611 } else {
2612 if (UsePerfData) _perf_total_standard_compile_count->inc();
2613 _total_standard_compile_count++;
2614 }
2615 }
2616 // set the current method for the thread to null
2617 if (UsePerfData) counters->set_current_method("");
2618 }
2619
2620 const char* CompileBroker::compiler_name(int comp_level) {
2621 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2622 if (comp == NULL) {
2623 return "no compiler";
2624 } else {
2625 return (comp->name());
2626 }
2627 }
2628
2629 jlong CompileBroker::total_compilation_ticks() {
2630 return _perf_total_compilation != NULL ? _perf_total_compilation->get_value() : 0;
2631 }
2632
2633 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2634 tty->print_cr(" %s {speed: %6.3f bytes/s; standard: %6.3f s, %d bytes, %d methods; osr: %6.3f s, %d bytes, %d methods; nmethods_size: %d bytes; nmethods_code_size: %d bytes}",
2635 name, stats->bytes_per_second(),
2636 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2637 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2638 stats->_nmethods_size, stats->_nmethods_code_size);
2639 }
2640
2641 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2642 if (per_compiler) {
2643 if (aggregate) {
2644 tty->cr();
2645 tty->print_cr("Individual compiler times (for compiled methods only)");
2646 tty->print_cr("------------------------------------------------");
2647 tty->cr();
2648 }
2649 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2650 AbstractCompiler* comp = _compilers[i];
2651 if (comp != NULL) {
2652 print_times(comp->name(), comp->stats());
2653 }
2654 }
2655 if (aggregate) {
2656 tty->cr();
2657 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2658 tty->print_cr("------------------------------------------------");
2659 tty->cr();
2660 }
2661 char tier_name[256];
2662 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2663 CompilerStatistics* stats = &_stats_per_level[tier-1];
2664 sprintf(tier_name, "Tier%d", tier);
2665 print_times(tier_name, stats);
2666 }
2667 }
2668
2669 if (!aggregate) {
2670 return;
2671 }
2672
2673 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2674 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2675 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2676
2677 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2678 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2679
2680 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2681 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2682 int total_compile_count = CompileBroker::_total_compile_count;
2683 int total_bailout_count = CompileBroker::_total_bailout_count;
2684 int total_invalidated_count = CompileBroker::_total_invalidated_count;
2685
2686 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2687 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2688
2689 tty->cr();
2690 tty->print_cr("Accumulated compiler times");
2691 tty->print_cr("----------------------------------------------------------");
2692 //0000000000111111111122222222223333333333444444444455555555556666666666
2693 //0123456789012345678901234567890123456789012345678901234567890123456789
2694 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2695 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2696 standard_compilation.seconds(),
2697 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2698 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2699 CompileBroker::_t_bailedout_compilation.seconds(),
2700 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2701 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2702 osr_compilation.seconds(),
2703 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2704 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2705 CompileBroker::_t_invalidated_compilation.seconds(),
2706 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2707
2708 AbstractCompiler *comp = compiler(CompLevel_simple);
2709 if (comp != NULL) {
2710 tty->cr();
2711 comp->print_timers();
2712 }
2713 comp = compiler(CompLevel_full_optimization);
2714 if (comp != NULL) {
2715 tty->cr();
2716 comp->print_timers();
2717 }
2718 #if INCLUDE_JVMCI
2719 if (EnableJVMCI) {
2720 tty->cr();
2721 JVMCICompiler::print_hosted_timers();
2722 }
2723 #endif
2724
2725 tty->cr();
2726 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2727 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2728 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2729 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2730 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2731 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2732 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2733 double tcs = total_compilation.seconds();
2734 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2735 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2736 tty->cr();
2737 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2738 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2739 }
2740
2741 // Print general/accumulated JIT information.
2742 void CompileBroker::print_info(outputStream *out) {
2743 if (out == NULL) out = tty;
2744 out->cr();
2745 out->print_cr("======================");
2746 out->print_cr(" General JIT info ");
2747 out->print_cr("======================");
2748 out->cr();
2749 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2750 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2751 out->cr();
2752 out->print_cr("CodeCache overview");
2753 out->print_cr("--------------------------------------------------------");
2754 out->cr();
2755 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2756 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2757 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2758 out->cr();
2759
2760 out->cr();
2761 out->print_cr("CodeCache cleaning overview");
2762 out->print_cr("--------------------------------------------------------");
2763 out->cr();
2764 NMethodSweeper::print(out);
2765 out->print_cr("--------------------------------------------------------");
2766 out->cr();
2767 }
2768
2769 // Note: tty_lock must not be held upon entry to this function.
2770 // Print functions called from herein do "micro-locking" on tty_lock.
2771 // That's a tradeoff which keeps together important blocks of output.
2772 // At the same time, continuous tty_lock hold time is kept in check,
2773 // preventing concurrently printing threads from stalling a long time.
2774 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2775 TimeStamp ts_total;
2776 TimeStamp ts_global;
2777 TimeStamp ts;
2778
2779 bool allFun = !strcmp(function, "all");
2780 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2781 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2782 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2783 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2784 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2785 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2786 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2787 bool discard = !strcmp(function, "discard") || allFun;
2788
2789 if (out == NULL) {
2790 out = tty;
2791 }
2792
2793 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2794 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2795 out->cr();
2796 return;
2797 }
2798
2799 ts_total.update(); // record starting point
2800
2801 if (aggregate) {
2802 print_info(out);
2803 }
2804
2805 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2806 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2807 // When we request individual parts of the analysis via the jcmd interface, it is possible
2808 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2809 // updated the aggregated data. We will then see a modified, but again consistent, view
2810 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2811 // a lock across user interaction.
2812
2813 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2814 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2815 // leading to an unnecessarily long hold time of the other locks we acquired before.
2816 ts.update(); // record starting point
2817 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2818 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2819
2820 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2821 // Unfortunately, such protection is not sufficient:
2822 // When a new nmethod is created via ciEnv::register_method(), the
2823 // Compile_lock is taken first. After some initializations,
2824 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2825 // immediately (after finalizing the oop references). To lock out concurrent
2826 // modifiers, we have to grab both locks as well in the described sequence.
2827 //
2828 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2829 // for the entire duration of aggregation and printing. That makes sure we see
2830 // a consistent picture and do not run into issues caused by concurrent alterations.
2831 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2832 !Compile_lock->owned_by_self();
2833 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2834 !CodeCache_lock->owned_by_self();
2835 Mutex* global_lock_1 = allFun ? (should_take_Compile_lock ? Compile_lock : NULL) : NULL;
2836 Monitor* global_lock_2 = allFun ? (should_take_CodeCache_lock ? CodeCache_lock : NULL) : NULL;
2837 Mutex* function_lock_1 = allFun ? NULL : (should_take_Compile_lock ? Compile_lock : NULL);
2838 Monitor* function_lock_2 = allFun ? NULL : (should_take_CodeCache_lock ? CodeCache_lock : NULL);
2839 ts_global.update(); // record starting point
2840 MutexLocker mu1(global_lock_1, Mutex::_safepoint_check_flag);
2841 MutexLocker mu2(global_lock_2, Mutex::_no_safepoint_check_flag);
2842 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2843 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2844 ts_global.update(); // record starting point
2845 }
2846
2847 if (aggregate) {
2848 ts.update(); // record starting point
2849 MutexLocker mu11(function_lock_1, Mutex::_safepoint_check_flag);
2850 MutexLocker mu22(function_lock_2, Mutex::_no_safepoint_check_flag);
2851 if ((function_lock_1 != NULL) || (function_lock_1 != NULL)) {
2852 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2853 }
2854
2855 ts.update(); // record starting point
2856 CodeCache::aggregate(out, granularity);
2857 if ((function_lock_1 != NULL) || (function_lock_1 != NULL)) {
2858 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2859 }
2860 }
2861
2862 if (usedSpace) CodeCache::print_usedSpace(out);
2863 if (freeSpace) CodeCache::print_freeSpace(out);
2864 if (methodCount) CodeCache::print_count(out);
2865 if (methodSpace) CodeCache::print_space(out);
2866 if (methodAge) CodeCache::print_age(out);
2867 if (methodNames) {
2868 if (allFun) {
2869 // print_names() can only be used safely if the locks have been continuously held
2870 // since aggregation begin. That is true only for function "all".
2871 CodeCache::print_names(out);
2872 } else {
2873 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2874 }
2875 }
2876 if (discard) CodeCache::discard(out);
2877
2878 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2879 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2880 }
2881 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2882 }