1 /*
2 * Copyright (c) 1999, 2021, 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 long 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 ResourceMark rm;
229 StringLogMessage lm;
230 lm.print("%4d COMPILE PROFILING SKIPPED: %s", -1, reason);
231 lm.print("\n");
232 log(JavaThread::current(), "%s", (const char*)lm);
233 }
234 };
235
236 static CompilationLog* _compilation_log = NULL;
237
238 bool compileBroker_init() {
239 if (LogEvents) {
240 _compilation_log = new CompilationLog();
241 }
242
243 // init directives stack, adding default directive
244 DirectivesStack::init();
245
246 if (DirectivesParser::has_file()) {
247 return DirectivesParser::parse_from_flag();
248 } else if (CompilerDirectivesPrint) {
249 // Print default directive even when no other was added
250 DirectivesStack::print(tty);
251 }
252
253 return true;
254 }
255
256 CompileTaskWrapper::CompileTaskWrapper(CompileTask* task) {
257 CompilerThread* thread = CompilerThread::current();
258 thread->set_task(task);
259 CompileLog* log = thread->log();
260 if (log != NULL && !task->is_unloaded()) task->log_task_start(log);
261 }
262
263 CompileTaskWrapper::~CompileTaskWrapper() {
264 CompilerThread* thread = CompilerThread::current();
265 CompileTask* task = thread->task();
266 CompileLog* log = thread->log();
267 if (log != NULL && !task->is_unloaded()) task->log_task_done(log);
268 thread->set_task(NULL);
269 task->set_code_handle(NULL);
270 thread->set_env(NULL);
271 if (task->is_blocking()) {
272 bool free_task = false;
273 {
274 MutexLocker notifier(thread, task->lock());
275 task->mark_complete();
276 #if INCLUDE_JVMCI
277 if (CompileBroker::compiler(task->comp_level())->is_jvmci()) {
278 if (!task->has_waiter()) {
279 // The waiting thread timed out and thus did not free the task.
280 free_task = true;
281 }
282 task->set_blocking_jvmci_compile_state(NULL);
283 }
284 #endif
285 if (!free_task) {
286 // Notify the waiting thread that the compilation has completed
287 // so that it can free the task.
288 task->lock()->notify_all();
289 }
290 }
291 if (free_task) {
292 // The task can only be freed once the task lock is released.
293 CompileTask::free(task);
294 }
295 } else {
296 task->mark_complete();
297
298 // By convention, the compiling thread is responsible for
299 // recycling a non-blocking CompileTask.
300 CompileTask::free(task);
301 }
302 }
303
304 /**
305 * Check if a CompilerThread can be removed and update count if requested.
306 */
307 bool CompileBroker::can_remove(CompilerThread *ct, bool do_it) {
308 assert(UseDynamicNumberOfCompilerThreads, "or shouldn't be here");
309 if (!ReduceNumberOfCompilerThreads) return false;
310
311 AbstractCompiler *compiler = ct->compiler();
312 int compiler_count = compiler->num_compiler_threads();
313 bool c1 = compiler->is_c1();
314
315 // Keep at least 1 compiler thread of each type.
316 if (compiler_count < 2) return false;
317
318 // Keep thread alive for at least some time.
319 if (ct->idle_time_millis() < (c1 ? 500 : 100)) return false;
320
321 #if INCLUDE_JVMCI
322 if (compiler->is_jvmci()) {
323 // Handles for JVMCI thread objects may get released concurrently.
324 if (do_it) {
325 assert(CompileThread_lock->owner() == ct, "must be holding lock");
326 } else {
327 // Skip check if it's the last thread and let caller check again.
328 return true;
329 }
330 }
331 #endif
332
333 // We only allow the last compiler thread of each type to get removed.
334 jobject last_compiler = c1 ? compiler1_object(compiler_count - 1)
335 : compiler2_object(compiler_count - 1);
336 if (ct->threadObj() == JNIHandles::resolve_non_null(last_compiler)) {
337 if (do_it) {
338 assert_locked_or_safepoint(CompileThread_lock); // Update must be consistent.
339 compiler->set_num_compiler_threads(compiler_count - 1);
340 #if INCLUDE_JVMCI
341 if (compiler->is_jvmci()) {
342 // Old j.l.Thread object can die when no longer referenced elsewhere.
343 JNIHandles::destroy_global(compiler2_object(compiler_count - 1));
344 _compiler2_objects[compiler_count - 1] = NULL;
345 }
346 #endif
347 }
348 return true;
349 }
350 return false;
351 }
352
353 /**
354 * Add a CompileTask to a CompileQueue.
355 */
356 void CompileQueue::add(CompileTask* task) {
357 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
358
359 task->set_next(NULL);
360 task->set_prev(NULL);
361
362 if (_last == NULL) {
363 // The compile queue is empty.
364 assert(_first == NULL, "queue is empty");
365 _first = task;
366 _last = task;
367 } else {
368 // Append the task to the queue.
369 assert(_last->next() == NULL, "not last");
370 _last->set_next(task);
371 task->set_prev(_last);
372 _last = task;
373 }
374 ++_size;
375
376 // Mark the method as being in the compile queue.
377 task->method()->set_queued_for_compilation();
378
379 if (CIPrintCompileQueue) {
380 print_tty();
381 }
382
383 if (LogCompilation && xtty != NULL) {
384 task->log_task_queued();
385 }
386
387 // Notify CompilerThreads that a task is available.
388 MethodCompileQueue_lock->notify_all();
389 }
390
391 /**
392 * Empties compilation queue by putting all compilation tasks onto
393 * a freelist. Furthermore, the method wakes up all threads that are
394 * waiting on a compilation task to finish. This can happen if background
395 * compilation is disabled.
396 */
397 void CompileQueue::free_all() {
398 MutexLocker mu(MethodCompileQueue_lock);
399 CompileTask* next = _first;
400
401 // Iterate over all tasks in the compile queue
402 while (next != NULL) {
403 CompileTask* current = next;
404 next = current->next();
405 {
406 // Wake up thread that blocks on the compile task.
407 MutexLocker ct_lock(current->lock());
408 current->lock()->notify();
409 }
410 // Put the task back on the freelist.
411 CompileTask::free(current);
412 }
413 _first = NULL;
414
415 // Wake up all threads that block on the queue.
416 MethodCompileQueue_lock->notify_all();
417 }
418
419 /**
420 * Get the next CompileTask from a CompileQueue
421 */
422 CompileTask* CompileQueue::get() {
423 // save methods from RedefineClasses across safepoint
424 // across MethodCompileQueue_lock below.
425 methodHandle save_method;
426 methodHandle save_hot_method;
427
428 MonitorLocker locker(MethodCompileQueue_lock);
429 // If _first is NULL we have no more compile jobs. There are two reasons for
430 // having no compile jobs: First, we compiled everything we wanted. Second,
431 // we ran out of code cache so compilation has been disabled. In the latter
432 // case we perform code cache sweeps to free memory such that we can re-enable
433 // compilation.
434 while (_first == NULL) {
435 // Exit loop if compilation is disabled forever
436 if (CompileBroker::is_compilation_disabled_forever()) {
437 return NULL;
438 }
439
440 // If there are no compilation tasks and we can compile new jobs
441 // (i.e., there is enough free space in the code cache) there is
442 // no need to invoke the sweeper. As a result, the hotness of methods
443 // remains unchanged. This behavior is desired, since we want to keep
444 // the stable state, i.e., we do not want to evict methods from the
445 // code cache if it is unnecessary.
446 // We need a timed wait here, since compiler threads can exit if compilation
447 // is disabled forever. We use 5 seconds wait time; the exiting of compiler threads
448 // is not critical and we do not want idle compiler threads to wake up too often.
449 locker.wait(5*1000);
450
451 if (UseDynamicNumberOfCompilerThreads && _first == NULL) {
452 // Still nothing to compile. Give caller a chance to stop this thread.
453 if (CompileBroker::can_remove(CompilerThread::current(), false)) return NULL;
454 }
455 }
456
457 if (CompileBroker::is_compilation_disabled_forever()) {
458 return NULL;
459 }
460
461 CompileTask* task;
462 {
463 NoSafepointVerifier nsv;
464 task = CompilationPolicy::select_task(this);
465 if (task != NULL) {
466 task = task->select_for_compilation();
467 }
468 }
469
470 if (task != NULL) {
471 // Save method pointers across unlock safepoint. The task is removed from
472 // the compilation queue, which is walked during RedefineClasses.
473 Thread* thread = Thread::current();
474 save_method = methodHandle(thread, task->method());
475 save_hot_method = methodHandle(thread, task->hot_method());
476
477 remove(task);
478 }
479 purge_stale_tasks(); // may temporarily release MCQ lock
480 return task;
481 }
482
483 // Clean & deallocate stale compile tasks.
484 // Temporarily releases MethodCompileQueue lock.
485 void CompileQueue::purge_stale_tasks() {
486 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
487 if (_first_stale != NULL) {
488 // Stale tasks are purged when MCQ lock is released,
489 // but _first_stale updates are protected by MCQ lock.
490 // Once task processing starts and MCQ lock is released,
491 // other compiler threads can reuse _first_stale.
492 CompileTask* head = _first_stale;
493 _first_stale = NULL;
494 {
495 MutexUnlocker ul(MethodCompileQueue_lock);
496 for (CompileTask* task = head; task != NULL; ) {
497 CompileTask* next_task = task->next();
498 CompileTaskWrapper ctw(task); // Frees the task
499 task->set_failure_reason("stale task");
500 task = next_task;
501 }
502 }
503 }
504 }
505
506 void CompileQueue::remove(CompileTask* task) {
507 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
508 if (task->prev() != NULL) {
509 task->prev()->set_next(task->next());
510 } else {
511 // max is the first element
512 assert(task == _first, "Sanity");
513 _first = task->next();
514 }
515
516 if (task->next() != NULL) {
517 task->next()->set_prev(task->prev());
518 } else {
519 // max is the last element
520 assert(task == _last, "Sanity");
521 _last = task->prev();
522 }
523 --_size;
524 }
525
526 void CompileQueue::remove_and_mark_stale(CompileTask* task) {
527 assert(MethodCompileQueue_lock->owned_by_self(), "must own lock");
528 remove(task);
529
530 // Enqueue the task for reclamation (should be done outside MCQ lock)
531 task->set_next(_first_stale);
532 task->set_prev(NULL);
533 _first_stale = task;
534 }
535
536 // methods in the compile queue need to be marked as used on the stack
537 // so that they don't get reclaimed by Redefine Classes
538 void CompileQueue::mark_on_stack() {
539 CompileTask* task = _first;
540 while (task != NULL) {
541 task->mark_on_stack();
542 task = task->next();
543 }
544 }
545
546
547 CompileQueue* CompileBroker::compile_queue(int comp_level) {
548 if (is_c2_compile(comp_level)) return _c2_compile_queue;
549 if (is_c1_compile(comp_level)) return _c1_compile_queue;
550 return NULL;
551 }
552
553 void CompileBroker::print_compile_queues(outputStream* st) {
554 st->print_cr("Current compiles: ");
555
556 char buf[2000];
557 int buflen = sizeof(buf);
558 Threads::print_threads_compiling(st, buf, buflen, /* short_form = */ true);
559
560 st->cr();
561 if (_c1_compile_queue != NULL) {
562 _c1_compile_queue->print(st);
563 }
564 if (_c2_compile_queue != NULL) {
565 _c2_compile_queue->print(st);
566 }
567 }
568
569 void CompileQueue::print(outputStream* st) {
570 assert_locked_or_safepoint(MethodCompileQueue_lock);
571 st->print_cr("%s:", name());
572 CompileTask* task = _first;
573 if (task == NULL) {
574 st->print_cr("Empty");
575 } else {
576 while (task != NULL) {
577 task->print(st, NULL, true, true);
578 task = task->next();
579 }
580 }
581 st->cr();
582 }
583
584 void CompileQueue::print_tty() {
585 ResourceMark rm;
586 stringStream ss;
587 // Dump the compile queue into a buffer before locking the tty
588 print(&ss);
589 {
590 ttyLocker ttyl;
591 tty->print("%s", ss.as_string());
592 }
593 }
594
595 CompilerCounters::CompilerCounters() {
596 _current_method[0] = '\0';
597 _compile_type = CompileBroker::no_compile;
598 }
599
600 #if INCLUDE_JFR && COMPILER2_OR_JVMCI
601 // It appends new compiler phase names to growable array phase_names(a new CompilerPhaseType mapping
602 // in compiler/compilerEvent.cpp) and registers it with its serializer.
603 //
604 // c2 uses explicit CompilerPhaseType idToPhase mapping in opto/phasetype.hpp,
605 // so if c2 is used, it should be always registered first.
606 // This function is called during vm initialization.
607 void register_jfr_phasetype_serializer(CompilerType compiler_type) {
608 ResourceMark rm;
609 static bool first_registration = true;
610 if (compiler_type == compiler_jvmci) {
611 CompilerEvent::PhaseEvent::get_phase_id("NOT_A_PHASE_NAME", false, false, false);
612 first_registration = false;
613 #ifdef COMPILER2
614 } else if (compiler_type == compiler_c2) {
615 assert(first_registration, "invariant"); // c2 must be registered first.
616 GrowableArray<const char*>* c2_phase_names = new GrowableArray<const char*>(PHASE_NUM_TYPES);
617 for (int i = 0; i < PHASE_NUM_TYPES; i++) {
618 const char* phase_name = CompilerPhaseTypeHelper::to_string((CompilerPhaseType) i);
619 CompilerEvent::PhaseEvent::get_phase_id(phase_name, false, false, false);
620 }
621 first_registration = false;
622 #endif // COMPILER2
623 }
624 }
625 #endif // INCLUDE_JFR && COMPILER2_OR_JVMCI
626
627 // ------------------------------------------------------------------
628 // CompileBroker::compilation_init
629 //
630 // Initialize the Compilation object
631 void CompileBroker::compilation_init_phase1(JavaThread* THREAD) {
632 // No need to initialize compilation system if we do not use it.
633 if (!UseCompiler) {
634 return;
635 }
636 // Set the interface to the current compiler(s).
637 _c1_count = CompilationPolicy::c1_count();
638 _c2_count = CompilationPolicy::c2_count();
639
640 #if INCLUDE_JVMCI
641 if (EnableJVMCI) {
642 // This is creating a JVMCICompiler singleton.
643 JVMCICompiler* jvmci = new JVMCICompiler();
644
645 if (UseJVMCICompiler) {
646 _compilers[1] = jvmci;
647 if (FLAG_IS_DEFAULT(JVMCIThreads)) {
648 if (BootstrapJVMCI) {
649 // JVMCI will bootstrap so give it more threads
650 _c2_count = MIN2(32, os::active_processor_count());
651 }
652 } else {
653 _c2_count = JVMCIThreads;
654 }
655 if (FLAG_IS_DEFAULT(JVMCIHostThreads)) {
656 } else {
657 #ifdef COMPILER1
658 _c1_count = JVMCIHostThreads;
659 #endif // COMPILER1
660 }
661 }
662 }
663 #endif // INCLUDE_JVMCI
664
665 #ifdef COMPILER1
666 if (_c1_count > 0) {
667 _compilers[0] = new Compiler();
668 }
669 #endif // COMPILER1
670
671 #ifdef COMPILER2
672 if (true JVMCI_ONLY( && !UseJVMCICompiler)) {
673 if (_c2_count > 0) {
674 _compilers[1] = new C2Compiler();
675 // Register c2 first as c2 CompilerPhaseType idToPhase mapping is explicit.
676 // idToPhase mapping for c2 is in opto/phasetype.hpp
677 JFR_ONLY(register_jfr_phasetype_serializer(compiler_c2);)
678 }
679 }
680 #endif // COMPILER2
681
682 #if INCLUDE_JVMCI
683 // Register after c2 registration.
684 // JVMCI CompilerPhaseType idToPhase mapping is dynamic.
685 if (EnableJVMCI) {
686 JFR_ONLY(register_jfr_phasetype_serializer(compiler_jvmci);)
687 }
688 #endif // INCLUDE_JVMCI
689
690 // Start the compiler thread(s) and the sweeper thread
691 init_compiler_sweeper_threads();
692 // totalTime performance counter is always created as it is required
693 // by the implementation of java.lang.management.CompilationMXBean.
694 {
695 // Ensure OOM leads to vm_exit_during_initialization.
696 EXCEPTION_MARK;
697 _perf_total_compilation =
698 PerfDataManager::create_counter(JAVA_CI, "totalTime",
699 PerfData::U_Ticks, CHECK);
700 }
701
702 if (UsePerfData) {
703
704 EXCEPTION_MARK;
705
706 // create the jvmstat performance counters
707 _perf_osr_compilation =
708 PerfDataManager::create_counter(SUN_CI, "osrTime",
709 PerfData::U_Ticks, CHECK);
710
711 _perf_standard_compilation =
712 PerfDataManager::create_counter(SUN_CI, "standardTime",
713 PerfData::U_Ticks, CHECK);
714
715 _perf_total_bailout_count =
716 PerfDataManager::create_counter(SUN_CI, "totalBailouts",
717 PerfData::U_Events, CHECK);
718
719 _perf_total_invalidated_count =
720 PerfDataManager::create_counter(SUN_CI, "totalInvalidates",
721 PerfData::U_Events, CHECK);
722
723 _perf_total_compile_count =
724 PerfDataManager::create_counter(SUN_CI, "totalCompiles",
725 PerfData::U_Events, CHECK);
726 _perf_total_osr_compile_count =
727 PerfDataManager::create_counter(SUN_CI, "osrCompiles",
728 PerfData::U_Events, CHECK);
729
730 _perf_total_standard_compile_count =
731 PerfDataManager::create_counter(SUN_CI, "standardCompiles",
732 PerfData::U_Events, CHECK);
733
734 _perf_sum_osr_bytes_compiled =
735 PerfDataManager::create_counter(SUN_CI, "osrBytes",
736 PerfData::U_Bytes, CHECK);
737
738 _perf_sum_standard_bytes_compiled =
739 PerfDataManager::create_counter(SUN_CI, "standardBytes",
740 PerfData::U_Bytes, CHECK);
741
742 _perf_sum_nmethod_size =
743 PerfDataManager::create_counter(SUN_CI, "nmethodSize",
744 PerfData::U_Bytes, CHECK);
745
746 _perf_sum_nmethod_code_size =
747 PerfDataManager::create_counter(SUN_CI, "nmethodCodeSize",
748 PerfData::U_Bytes, CHECK);
749
750 _perf_last_method =
751 PerfDataManager::create_string_variable(SUN_CI, "lastMethod",
752 CompilerCounters::cmname_buffer_length,
753 "", CHECK);
754
755 _perf_last_failed_method =
756 PerfDataManager::create_string_variable(SUN_CI, "lastFailedMethod",
757 CompilerCounters::cmname_buffer_length,
758 "", CHECK);
759
760 _perf_last_invalidated_method =
761 PerfDataManager::create_string_variable(SUN_CI, "lastInvalidatedMethod",
762 CompilerCounters::cmname_buffer_length,
763 "", CHECK);
764
765 _perf_last_compile_type =
766 PerfDataManager::create_variable(SUN_CI, "lastType",
767 PerfData::U_None,
768 (jlong)CompileBroker::no_compile,
769 CHECK);
770
771 _perf_last_compile_size =
772 PerfDataManager::create_variable(SUN_CI, "lastSize",
773 PerfData::U_Bytes,
774 (jlong)CompileBroker::no_compile,
775 CHECK);
776
777
778 _perf_last_failed_type =
779 PerfDataManager::create_variable(SUN_CI, "lastFailedType",
780 PerfData::U_None,
781 (jlong)CompileBroker::no_compile,
782 CHECK);
783
784 _perf_last_invalidated_type =
785 PerfDataManager::create_variable(SUN_CI, "lastInvalidatedType",
786 PerfData::U_None,
787 (jlong)CompileBroker::no_compile,
788 CHECK);
789 }
790 }
791
792 // Completes compiler initialization. Compilation requests submitted
793 // prior to this will be silently ignored.
794 void CompileBroker::compilation_init_phase2() {
795 _initialized = true;
796 }
797
798 Handle CompileBroker::create_thread_oop(const char* name, TRAPS) {
799 Handle thread_oop = JavaThread::create_system_thread_object(name, false /* not visible */, CHECK_NH);
800 return thread_oop;
801 }
802
803 #if defined(ASSERT) && COMPILER2_OR_JVMCI
804 // Stress testing. Dedicated threads revert optimizations based on escape analysis concurrently to
805 // the running java application. Configured with vm options DeoptimizeObjectsALot*.
806 class DeoptimizeObjectsALotThread : public JavaThread {
807
808 static void deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS);
809 void deoptimize_objects_alot_loop_single();
810 void deoptimize_objects_alot_loop_all();
811
812 public:
813 DeoptimizeObjectsALotThread() : JavaThread(&deopt_objs_alot_thread_entry) { }
814
815 bool is_hidden_from_external_view() const { return true; }
816 };
817
818 // Entry for DeoptimizeObjectsALotThread. The threads are started in
819 // CompileBroker::init_compiler_sweeper_threads() iff DeoptimizeObjectsALot is enabled
820 void DeoptimizeObjectsALotThread::deopt_objs_alot_thread_entry(JavaThread* thread, TRAPS) {
821 DeoptimizeObjectsALotThread* dt = ((DeoptimizeObjectsALotThread*) thread);
822 bool enter_single_loop;
823 {
824 MonitorLocker ml(dt, EscapeBarrier_lock, Mutex::_no_safepoint_check_flag);
825 static int single_thread_count = 0;
826 enter_single_loop = single_thread_count++ < DeoptimizeObjectsALotThreadCountSingle;
827 }
828 if (enter_single_loop) {
829 dt->deoptimize_objects_alot_loop_single();
830 } else {
831 dt->deoptimize_objects_alot_loop_all();
832 }
833 }
834
835 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
836 // barrier targets a single thread which is selected round robin.
837 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_single() {
838 HandleMark hm(this);
839 while (true) {
840 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *deoptee_thread = jtiwh.next(); ) {
841 { // Begin new scope for escape barrier
842 HandleMarkCleaner hmc(this);
843 ResourceMark rm(this);
844 EscapeBarrier eb(true, this, deoptee_thread);
845 eb.deoptimize_objects(100);
846 }
847 // Now sleep after the escape barriers destructor resumed deoptee_thread.
848 sleep(DeoptimizeObjectsALotInterval);
849 }
850 }
851 }
852
853 // Execute EscapeBarriers in an endless loop to revert optimizations based on escape analysis. Each
854 // barrier targets all java threads in the vm at once.
855 void DeoptimizeObjectsALotThread::deoptimize_objects_alot_loop_all() {
856 HandleMark hm(this);
857 while (true) {
858 { // Begin new scope for escape barrier
859 HandleMarkCleaner hmc(this);
860 ResourceMark rm(this);
861 EscapeBarrier eb(true, this);
862 eb.deoptimize_objects_all_threads();
863 }
864 // Now sleep after the escape barriers destructor resumed the java threads.
865 sleep(DeoptimizeObjectsALotInterval);
866 }
867 }
868 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
869
870
871 JavaThread* CompileBroker::make_thread(ThreadType type, jobject thread_handle, CompileQueue* queue, AbstractCompiler* comp, JavaThread* THREAD) {
872 JavaThread* new_thread = NULL;
873
874 switch (type) {
875 case compiler_t:
876 assert(comp != NULL, "Compiler instance missing.");
877 if (!InjectCompilerCreationFailure || comp->num_compiler_threads() == 0) {
878 CompilerCounters* counters = new CompilerCounters();
879 new_thread = new CompilerThread(queue, counters);
880 }
881 break;
882 case sweeper_t:
883 new_thread = new CodeCacheSweeperThread();
884 break;
885 #if defined(ASSERT) && COMPILER2_OR_JVMCI
886 case deoptimizer_t:
887 new_thread = new DeoptimizeObjectsALotThread();
888 break;
889 #endif // ASSERT
890 default:
891 ShouldNotReachHere();
892 }
893
894 // At this point the new CompilerThread data-races with this startup
895 // thread (which is the main thread and NOT the VM thread).
896 // This means Java bytecodes being executed at startup can
897 // queue compile jobs which will run at whatever default priority the
898 // newly created CompilerThread runs at.
899
900
901 // At this point it may be possible that no osthread was created for the
902 // JavaThread due to lack of resources. We will handle that failure below.
903 // Also check new_thread so that static analysis is happy.
904 if (new_thread != NULL && new_thread->osthread() != NULL) {
905 Handle thread_oop(THREAD, JNIHandles::resolve_non_null(thread_handle));
906
907 if (type == compiler_t) {
908 CompilerThread::cast(new_thread)->set_compiler(comp);
909 }
910
911 // Note that we cannot call os::set_priority because it expects Java
912 // priorities and we are *explicitly* using OS priorities so that it's
913 // possible to set the compiler thread priority higher than any Java
914 // thread.
915
916 int native_prio = CompilerThreadPriority;
917 if (native_prio == -1) {
918 if (UseCriticalCompilerThreadPriority) {
919 native_prio = os::java_to_os_priority[CriticalPriority];
920 } else {
921 native_prio = os::java_to_os_priority[NearMaxPriority];
922 }
923 }
924 os::set_native_priority(new_thread, native_prio);
925
926 // Note that this only sets the JavaThread _priority field, which by
927 // definition is limited to Java priorities and not OS priorities.
928 JavaThread::start_internal_daemon(THREAD, new_thread, thread_oop, NearMaxPriority);
929
930 } else { // osthread initialization failure
931 if (UseDynamicNumberOfCompilerThreads && type == compiler_t
932 && comp->num_compiler_threads() > 0) {
933 // The new thread is not known to Thread-SMR yet so we can just delete.
934 delete new_thread;
935 return NULL;
936 } else {
937 vm_exit_during_initialization("java.lang.OutOfMemoryError",
938 os::native_thread_creation_failed_msg());
939 }
940 }
941
942 os::naked_yield(); // make sure that the compiler thread is started early (especially helpful on SOLARIS)
943
944 return new_thread;
945 }
946
947
948 void CompileBroker::init_compiler_sweeper_threads() {
949 NMethodSweeper::set_sweep_threshold_bytes(static_cast<size_t>(SweeperThreshold * ReservedCodeCacheSize / 100.0));
950 log_info(codecache, sweep)("Sweeper threshold: " SIZE_FORMAT " bytes", NMethodSweeper::sweep_threshold_bytes());
951
952 // Ensure any exceptions lead to vm_exit_during_initialization.
953 EXCEPTION_MARK;
954 #if !defined(ZERO)
955 assert(_c2_count > 0 || _c1_count > 0, "No compilers?");
956 #endif // !ZERO
957 // Initialize the compilation queue
958 if (_c2_count > 0) {
959 const char* name = JVMCI_ONLY(UseJVMCICompiler ? "JVMCI compile queue" :) "C2 compile queue";
960 _c2_compile_queue = new CompileQueue(name);
961 _compiler2_objects = NEW_C_HEAP_ARRAY(jobject, _c2_count, mtCompiler);
962 _compiler2_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c2_count, mtCompiler);
963 }
964 if (_c1_count > 0) {
965 _c1_compile_queue = new CompileQueue("C1 compile queue");
966 _compiler1_objects = NEW_C_HEAP_ARRAY(jobject, _c1_count, mtCompiler);
967 _compiler1_logs = NEW_C_HEAP_ARRAY(CompileLog*, _c1_count, mtCompiler);
968 }
969
970 char name_buffer[256];
971
972 for (int i = 0; i < _c2_count; i++) {
973 jobject thread_handle = NULL;
974 // Create all j.l.Thread objects for C1 and C2 threads here, but only one
975 // for JVMCI compiler which can create further ones on demand.
976 JVMCI_ONLY(if (!UseJVMCICompiler || !UseDynamicNumberOfCompilerThreads || i == 0) {)
977 // Create a name for our thread.
978 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
979 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
980 thread_handle = JNIHandles::make_global(thread_oop);
981 JVMCI_ONLY(})
982 _compiler2_objects[i] = thread_handle;
983 _compiler2_logs[i] = NULL;
984
985 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
986 JavaThread *ct = make_thread(compiler_t, thread_handle, _c2_compile_queue, _compilers[1], THREAD);
987 assert(ct != NULL, "should have been handled for initial thread");
988 _compilers[1]->set_num_compiler_threads(i + 1);
989 if (TraceCompilerThreads) {
990 ResourceMark rm;
991 ThreadsListHandle tlh; // name() depends on the TLH.
992 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
993 tty->print_cr("Added initial compiler thread %s", ct->name());
994 }
995 }
996 }
997
998 for (int i = 0; i < _c1_count; i++) {
999 // Create a name for our thread.
1000 sprintf(name_buffer, "C1 CompilerThread%d", i);
1001 Handle thread_oop = create_thread_oop(name_buffer, CHECK);
1002 jobject thread_handle = JNIHandles::make_global(thread_oop);
1003 _compiler1_objects[i] = thread_handle;
1004 _compiler1_logs[i] = NULL;
1005
1006 if (!UseDynamicNumberOfCompilerThreads || i == 0) {
1007 JavaThread *ct = make_thread(compiler_t, thread_handle, _c1_compile_queue, _compilers[0], THREAD);
1008 assert(ct != NULL, "should have been handled for initial thread");
1009 _compilers[0]->set_num_compiler_threads(i + 1);
1010 if (TraceCompilerThreads) {
1011 ResourceMark rm;
1012 ThreadsListHandle tlh; // name() depends on the TLH.
1013 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1014 tty->print_cr("Added initial compiler thread %s", ct->name());
1015 }
1016 }
1017 }
1018
1019 if (UsePerfData) {
1020 PerfDataManager::create_constant(SUN_CI, "threads", PerfData::U_Bytes, _c1_count + _c2_count, CHECK);
1021 }
1022
1023 if (MethodFlushing) {
1024 // Initialize the sweeper thread
1025 Handle thread_oop = create_thread_oop("Sweeper thread", CHECK);
1026 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1027 make_thread(sweeper_t, thread_handle, NULL, NULL, THREAD);
1028 }
1029
1030 #if defined(ASSERT) && COMPILER2_OR_JVMCI
1031 if (DeoptimizeObjectsALot) {
1032 // Initialize and start the object deoptimizer threads
1033 const int total_count = DeoptimizeObjectsALotThreadCountSingle + DeoptimizeObjectsALotThreadCountAll;
1034 for (int count = 0; count < total_count; count++) {
1035 Handle thread_oop = create_thread_oop("Deoptimize objects a lot single mode", CHECK);
1036 jobject thread_handle = JNIHandles::make_local(THREAD, thread_oop());
1037 make_thread(deoptimizer_t, thread_handle, NULL, NULL, THREAD);
1038 }
1039 }
1040 #endif // defined(ASSERT) && COMPILER2_OR_JVMCI
1041 }
1042
1043 void CompileBroker::possibly_add_compiler_threads(JavaThread* THREAD) {
1044
1045 julong available_memory = os::available_memory();
1046 // If SegmentedCodeCache is off, both values refer to the single heap (with type CodeBlobType::All).
1047 size_t available_cc_np = CodeCache::unallocated_capacity(CodeBlobType::MethodNonProfiled),
1048 available_cc_p = CodeCache::unallocated_capacity(CodeBlobType::MethodProfiled);
1049
1050 // Only do attempt to start additional threads if the lock is free.
1051 if (!CompileThread_lock->try_lock()) return;
1052
1053 if (_c2_compile_queue != NULL) {
1054 int old_c2_count = _compilers[1]->num_compiler_threads();
1055 int new_c2_count = MIN4(_c2_count,
1056 _c2_compile_queue->size() / 2,
1057 (int)(available_memory / (200*M)),
1058 (int)(available_cc_np / (128*K)));
1059
1060 for (int i = old_c2_count; i < new_c2_count; i++) {
1061 #if INCLUDE_JVMCI
1062 if (UseJVMCICompiler) {
1063 // Native compiler threads as used in C1/C2 can reuse the j.l.Thread
1064 // objects as their existence is completely hidden from the rest of
1065 // the VM (and those compiler threads can't call Java code to do the
1066 // creation anyway). For JVMCI we have to create new j.l.Thread objects
1067 // as they are visible and we can see unexpected thread lifecycle
1068 // transitions if we bind them to new JavaThreads.
1069 if (!THREAD->can_call_java()) break;
1070 char name_buffer[256];
1071 sprintf(name_buffer, "%s CompilerThread%d", _compilers[1]->name(), i);
1072 Handle thread_oop;
1073 {
1074 // We have to give up the lock temporarily for the Java calls.
1075 MutexUnlocker mu(CompileThread_lock);
1076 thread_oop = create_thread_oop(name_buffer, THREAD);
1077 }
1078 if (HAS_PENDING_EXCEPTION) {
1079 if (TraceCompilerThreads) {
1080 ResourceMark rm;
1081 tty->print_cr("JVMCI compiler thread creation failed:");
1082 PENDING_EXCEPTION->print();
1083 }
1084 CLEAR_PENDING_EXCEPTION;
1085 break;
1086 }
1087 // Check if another thread has beaten us during the Java calls.
1088 if (_compilers[1]->num_compiler_threads() != i) break;
1089 jobject thread_handle = JNIHandles::make_global(thread_oop);
1090 assert(compiler2_object(i) == NULL, "Old one must be released!");
1091 _compiler2_objects[i] = thread_handle;
1092 }
1093 #endif
1094 JavaThread *ct = make_thread(compiler_t, compiler2_object(i), _c2_compile_queue, _compilers[1], THREAD);
1095 if (ct == NULL) break;
1096 _compilers[1]->set_num_compiler_threads(i + 1);
1097 if (TraceCompilerThreads) {
1098 ResourceMark rm;
1099 ThreadsListHandle tlh; // name() depends on the TLH.
1100 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1101 tty->print_cr("Added compiler thread %s (available memory: %dMB, available non-profiled code cache: %dMB)",
1102 ct->name(), (int)(available_memory/M), (int)(available_cc_np/M));
1103 }
1104 }
1105 }
1106
1107 if (_c1_compile_queue != NULL) {
1108 int old_c1_count = _compilers[0]->num_compiler_threads();
1109 int new_c1_count = MIN4(_c1_count,
1110 _c1_compile_queue->size() / 4,
1111 (int)(available_memory / (100*M)),
1112 (int)(available_cc_p / (128*K)));
1113
1114 for (int i = old_c1_count; i < new_c1_count; i++) {
1115 JavaThread *ct = make_thread(compiler_t, compiler1_object(i), _c1_compile_queue, _compilers[0], THREAD);
1116 if (ct == NULL) break;
1117 _compilers[0]->set_num_compiler_threads(i + 1);
1118 if (TraceCompilerThreads) {
1119 ResourceMark rm;
1120 ThreadsListHandle tlh; // name() depends on the TLH.
1121 assert(tlh.includes(ct), "ct=" INTPTR_FORMAT " exited unexpectedly.", p2i(ct));
1122 tty->print_cr("Added compiler thread %s (available memory: %dMB, available profiled code cache: %dMB)",
1123 ct->name(), (int)(available_memory/M), (int)(available_cc_p/M));
1124 }
1125 }
1126 }
1127
1128 CompileThread_lock->unlock();
1129 }
1130
1131
1132 /**
1133 * Set the methods on the stack as on_stack so that redefine classes doesn't
1134 * reclaim them. This method is executed at a safepoint.
1135 */
1136 void CompileBroker::mark_on_stack() {
1137 assert(SafepointSynchronize::is_at_safepoint(), "sanity check");
1138 // Since we are at a safepoint, we do not need a lock to access
1139 // the compile queues.
1140 if (_c2_compile_queue != NULL) {
1141 _c2_compile_queue->mark_on_stack();
1142 }
1143 if (_c1_compile_queue != NULL) {
1144 _c1_compile_queue->mark_on_stack();
1145 }
1146 }
1147
1148 // ------------------------------------------------------------------
1149 // CompileBroker::compile_method
1150 //
1151 // Request compilation of a method.
1152 void CompileBroker::compile_method_base(const methodHandle& method,
1153 int osr_bci,
1154 int comp_level,
1155 const methodHandle& hot_method,
1156 int hot_count,
1157 CompileTask::CompileReason compile_reason,
1158 bool blocking,
1159 Thread* thread) {
1160 guarantee(!method->is_abstract(), "cannot compile abstract methods");
1161 assert(method->method_holder()->is_instance_klass(),
1162 "sanity check");
1163 assert(!method->method_holder()->is_not_initialized(),
1164 "method holder must be initialized");
1165 assert(!method->is_method_handle_intrinsic(), "do not enqueue these guys");
1166
1167 if (CIPrintRequests) {
1168 tty->print("request: ");
1169 method->print_short_name(tty);
1170 if (osr_bci != InvocationEntryBci) {
1171 tty->print(" osr_bci: %d", osr_bci);
1172 }
1173 tty->print(" level: %d comment: %s count: %d", comp_level, CompileTask::reason_name(compile_reason), hot_count);
1174 if (!hot_method.is_null()) {
1175 tty->print(" hot: ");
1176 if (hot_method() != method()) {
1177 hot_method->print_short_name(tty);
1178 } else {
1179 tty->print("yes");
1180 }
1181 }
1182 tty->cr();
1183 }
1184
1185 // A request has been made for compilation. Before we do any
1186 // real work, check to see if the method has been compiled
1187 // in the meantime with a definitive result.
1188 if (compilation_is_complete(method, osr_bci, comp_level)) {
1189 return;
1190 }
1191
1192 #ifndef PRODUCT
1193 if (osr_bci != -1 && !FLAG_IS_DEFAULT(OSROnlyBCI)) {
1194 if ((OSROnlyBCI > 0) ? (OSROnlyBCI != osr_bci) : (-OSROnlyBCI == osr_bci)) {
1195 // Positive OSROnlyBCI means only compile that bci. Negative means don't compile that BCI.
1196 return;
1197 }
1198 }
1199 #endif
1200
1201 // If this method is already in the compile queue, then
1202 // we do not block the current thread.
1203 if (compilation_is_in_queue(method)) {
1204 // We may want to decay our counter a bit here to prevent
1205 // multiple denied requests for compilation. This is an
1206 // open compilation policy issue. Note: The other possibility,
1207 // in the case that this is a blocking compile request, is to have
1208 // all subsequent blocking requesters wait for completion of
1209 // ongoing compiles. Note that in this case we'll need a protocol
1210 // for freeing the associated compile tasks. [Or we could have
1211 // a single static monitor on which all these waiters sleep.]
1212 return;
1213 }
1214
1215 // Tiered policy requires MethodCounters to exist before adding a method to
1216 // the queue. Create if we don't have them yet.
1217 method->get_method_counters(thread);
1218
1219 // Outputs from the following MutexLocker block:
1220 CompileTask* task = NULL;
1221 CompileQueue* queue = compile_queue(comp_level);
1222
1223 // Acquire our lock.
1224 {
1225 MutexLocker locker(thread, MethodCompileQueue_lock);
1226
1227 // Make sure the method has not slipped into the queues since
1228 // last we checked; note that those checks were "fast bail-outs".
1229 // Here we need to be more careful, see 14012000 below.
1230 if (compilation_is_in_queue(method)) {
1231 return;
1232 }
1233
1234 // We need to check again to see if the compilation has
1235 // completed. A previous compilation may have registered
1236 // some result.
1237 if (compilation_is_complete(method, osr_bci, comp_level)) {
1238 return;
1239 }
1240
1241 // We now know that this compilation is not pending, complete,
1242 // or prohibited. Assign a compile_id to this compilation
1243 // and check to see if it is in our [Start..Stop) range.
1244 int compile_id = assign_compile_id(method, osr_bci);
1245 if (compile_id == 0) {
1246 // The compilation falls outside the allowed range.
1247 return;
1248 }
1249
1250 #if INCLUDE_JVMCI
1251 if (UseJVMCICompiler && blocking) {
1252 // Don't allow blocking compiles for requests triggered by JVMCI.
1253 if (thread->is_Compiler_thread()) {
1254 blocking = false;
1255 }
1256
1257 if (!UseJVMCINativeLibrary) {
1258 // Don't allow blocking compiles if inside a class initializer or while performing class loading
1259 vframeStream vfst(JavaThread::cast(thread));
1260 for (; !vfst.at_end(); vfst.next()) {
1261 if (vfst.method()->is_static_initializer() ||
1262 (vfst.method()->method_holder()->is_subclass_of(vmClasses::ClassLoader_klass()) &&
1263 vfst.method()->name() == vmSymbols::loadClass_name())) {
1264 blocking = false;
1265 break;
1266 }
1267 }
1268 }
1269
1270 // Don't allow blocking compilation requests to JVMCI
1271 // if JVMCI itself is not yet initialized
1272 if (!JVMCI::is_compiler_initialized() && compiler(comp_level)->is_jvmci()) {
1273 blocking = false;
1274 }
1275
1276 // Don't allow blocking compilation requests if we are in JVMCIRuntime::shutdown
1277 // to avoid deadlock between compiler thread(s) and threads run at shutdown
1278 // such as the DestroyJavaVM thread.
1279 if (JVMCI::in_shutdown()) {
1280 blocking = false;
1281 }
1282 }
1283 #endif // INCLUDE_JVMCI
1284
1285 // We will enter the compilation in the queue.
1286 // 14012000: Note that this sets the queued_for_compile bits in
1287 // the target method. We can now reason that a method cannot be
1288 // queued for compilation more than once, as follows:
1289 // Before a thread queues a task for compilation, it first acquires
1290 // the compile queue lock, then checks if the method's queued bits
1291 // are set or it has already been compiled. Thus there can not be two
1292 // instances of a compilation task for the same method on the
1293 // compilation queue. Consider now the case where the compilation
1294 // thread has already removed a task for that method from the queue
1295 // and is in the midst of compiling it. In this case, the
1296 // queued_for_compile bits must be set in the method (and these
1297 // will be visible to the current thread, since the bits were set
1298 // under protection of the compile queue lock, which we hold now.
1299 // When the compilation completes, the compiler thread first sets
1300 // the compilation result and then clears the queued_for_compile
1301 // bits. Neither of these actions are protected by a barrier (or done
1302 // under the protection of a lock), so the only guarantee we have
1303 // (on machines with TSO (Total Store Order)) is that these values
1304 // will update in that order. As a result, the only combinations of
1305 // these bits that the current thread will see are, in temporal order:
1306 // <RESULT, QUEUE> :
1307 // <0, 1> : in compile queue, but not yet compiled
1308 // <1, 1> : compiled but queue bit not cleared
1309 // <1, 0> : compiled and queue bit cleared
1310 // Because we first check the queue bits then check the result bits,
1311 // we are assured that we cannot introduce a duplicate task.
1312 // Note that if we did the tests in the reverse order (i.e. check
1313 // result then check queued bit), we could get the result bit before
1314 // the compilation completed, and the queue bit after the compilation
1315 // completed, and end up introducing a "duplicate" (redundant) task.
1316 // In that case, the compiler thread should first check if a method
1317 // has already been compiled before trying to compile it.
1318 // NOTE: in the event that there are multiple compiler threads and
1319 // there is de-optimization/recompilation, things will get hairy,
1320 // and in that case it's best to protect both the testing (here) of
1321 // these bits, and their updating (here and elsewhere) under a
1322 // common lock.
1323 task = create_compile_task(queue,
1324 compile_id, method,
1325 osr_bci, comp_level,
1326 hot_method, hot_count, compile_reason,
1327 blocking);
1328 }
1329
1330 if (blocking) {
1331 wait_for_completion(task);
1332 }
1333 }
1334
1335 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1336 int comp_level,
1337 const methodHandle& hot_method, int hot_count,
1338 CompileTask::CompileReason compile_reason,
1339 TRAPS) {
1340 // Do nothing if compilebroker is not initalized or compiles are submitted on level none
1341 if (!_initialized || comp_level == CompLevel_none) {
1342 return NULL;
1343 }
1344
1345 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
1346 assert(comp != NULL, "Ensure we have a compiler");
1347
1348 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, comp);
1349 // CompileBroker::compile_method can trap and can have pending aysnc exception.
1350 nmethod* nm = CompileBroker::compile_method(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, directive, THREAD);
1351 DirectivesStack::release(directive);
1352 return nm;
1353 }
1354
1355 nmethod* CompileBroker::compile_method(const methodHandle& method, int osr_bci,
1356 int comp_level,
1357 const methodHandle& hot_method, int hot_count,
1358 CompileTask::CompileReason compile_reason,
1359 DirectiveSet* directive,
1360 TRAPS) {
1361
1362 // make sure arguments make sense
1363 assert(method->method_holder()->is_instance_klass(), "not an instance method");
1364 assert(osr_bci == InvocationEntryBci || (0 <= osr_bci && osr_bci < method->code_size()), "bci out of range");
1365 assert(!method->is_abstract() && (osr_bci == InvocationEntryBci || !method->is_native()), "cannot compile abstract/native methods");
1366 assert(!method->method_holder()->is_not_initialized(), "method holder must be initialized");
1367 // return quickly if possible
1368
1369 // lock, make sure that the compilation
1370 // isn't prohibited in a straightforward way.
1371 AbstractCompiler* comp = CompileBroker::compiler(comp_level);
1372 if (comp == NULL || compilation_is_prohibited(method, osr_bci, comp_level, directive->ExcludeOption)) {
1373 return NULL;
1374 }
1375
1376 #if INCLUDE_JVMCI
1377 if (comp->is_jvmci() && !JVMCI::can_initialize_JVMCI()) {
1378 return NULL;
1379 }
1380 #endif
1381
1382 if (osr_bci == InvocationEntryBci) {
1383 // standard compilation
1384 CompiledMethod* method_code = method->code();
1385 if (method_code != NULL && method_code->is_nmethod()) {
1386 if (compilation_is_complete(method, osr_bci, comp_level)) {
1387 return (nmethod*) method_code;
1388 }
1389 }
1390 if (method->is_not_compilable(comp_level)) {
1391 return NULL;
1392 }
1393 } else {
1394 // osr compilation
1395 // We accept a higher level osr method
1396 nmethod* nm = method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1397 if (nm != NULL) return nm;
1398 if (method->is_not_osr_compilable(comp_level)) return NULL;
1399 }
1400
1401 assert(!HAS_PENDING_EXCEPTION, "No exception should be present");
1402 // some prerequisites that are compiler specific
1403 if (comp->is_c2() || comp->is_jvmci()) {
1404 method->constants()->resolve_string_constants(CHECK_AND_CLEAR_NONASYNC_NULL);
1405 // Resolve all classes seen in the signature of the method
1406 // we are compiling.
1407 Method::load_signature_classes(method, CHECK_AND_CLEAR_NONASYNC_NULL);
1408 }
1409
1410 // If the method is native, do the lookup in the thread requesting
1411 // the compilation. Native lookups can load code, which is not
1412 // permitted during compilation.
1413 //
1414 // Note: A native method implies non-osr compilation which is
1415 // checked with an assertion at the entry of this method.
1416 if (method->is_native() && !method->is_method_handle_intrinsic()) {
1417 address adr = NativeLookup::lookup(method, THREAD);
1418 if (HAS_PENDING_EXCEPTION) {
1419 // In case of an exception looking up the method, we just forget
1420 // about it. The interpreter will kick-in and throw the exception.
1421 method->set_not_compilable("NativeLookup::lookup failed"); // implies is_not_osr_compilable()
1422 CLEAR_PENDING_EXCEPTION;
1423 return NULL;
1424 }
1425 assert(method->has_native_function(), "must have native code by now");
1426 }
1427
1428 // RedefineClasses() has replaced this method; just return
1429 if (method->is_old()) {
1430 return NULL;
1431 }
1432
1433 // JVMTI -- post_compile_event requires jmethod_id() that may require
1434 // a lock the compiling thread can not acquire. Prefetch it here.
1435 if (JvmtiExport::should_post_compiled_method_load()) {
1436 method->jmethod_id();
1437 }
1438
1439 // do the compilation
1440 if (method->is_native()) {
1441 if (!PreferInterpreterNativeStubs || method->is_method_handle_intrinsic()) {
1442 #if defined(X86) && !defined(ZERO)
1443 // The following native methods:
1444 //
1445 // java.lang.Float.intBitsToFloat
1446 // java.lang.Float.floatToRawIntBits
1447 // java.lang.Double.longBitsToDouble
1448 // java.lang.Double.doubleToRawLongBits
1449 //
1450 // are called through the interpreter even if interpreter native stubs
1451 // are not preferred (i.e., calling through adapter handlers is preferred).
1452 // The reason is that on x86_32 signaling NaNs (sNaNs) are not preserved
1453 // if the version of the methods from the native libraries is called.
1454 // As the interpreter and the C2-intrinsified version of the methods preserves
1455 // sNaNs, that would result in an inconsistent way of handling of sNaNs.
1456 if ((UseSSE >= 1 &&
1457 (method->intrinsic_id() == vmIntrinsics::_intBitsToFloat ||
1458 method->intrinsic_id() == vmIntrinsics::_floatToRawIntBits)) ||
1459 (UseSSE >= 2 &&
1460 (method->intrinsic_id() == vmIntrinsics::_longBitsToDouble ||
1461 method->intrinsic_id() == vmIntrinsics::_doubleToRawLongBits))) {
1462 return NULL;
1463 }
1464 #endif // X86 && !ZERO
1465
1466 // To properly handle the appendix argument for out-of-line calls we are using a small trampoline that
1467 // pops off the appendix argument and jumps to the target (see gen_special_dispatch in SharedRuntime).
1468 //
1469 // Since normal compiled-to-compiled calls are not able to handle such a thing we MUST generate an adapter
1470 // in this case. If we can't generate one and use it we can not execute the out-of-line method handle calls.
1471 AdapterHandlerLibrary::create_native_wrapper(method);
1472 } else {
1473 return NULL;
1474 }
1475 } else {
1476 // If the compiler is shut off due to code cache getting full
1477 // fail out now so blocking compiles dont hang the java thread
1478 if (!should_compile_new_jobs()) {
1479 return NULL;
1480 }
1481 bool is_blocking = !directive->BackgroundCompilationOption || ReplayCompiles;
1482 compile_method_base(method, osr_bci, comp_level, hot_method, hot_count, compile_reason, is_blocking, THREAD);
1483 }
1484
1485 // return requested nmethod
1486 // We accept a higher level osr method
1487 if (osr_bci == InvocationEntryBci) {
1488 CompiledMethod* code = method->code();
1489 if (code == NULL) {
1490 return (nmethod*) code;
1491 } else {
1492 return code->as_nmethod_or_null();
1493 }
1494 }
1495 return method->lookup_osr_nmethod_for(osr_bci, comp_level, false);
1496 }
1497
1498
1499 // ------------------------------------------------------------------
1500 // CompileBroker::compilation_is_complete
1501 //
1502 // See if compilation of this method is already complete.
1503 bool CompileBroker::compilation_is_complete(const methodHandle& method,
1504 int osr_bci,
1505 int comp_level) {
1506 bool is_osr = (osr_bci != standard_entry_bci);
1507 if (is_osr) {
1508 if (method->is_not_osr_compilable(comp_level)) {
1509 return true;
1510 } else {
1511 nmethod* result = method->lookup_osr_nmethod_for(osr_bci, comp_level, true);
1512 return (result != NULL);
1513 }
1514 } else {
1515 if (method->is_not_compilable(comp_level)) {
1516 return true;
1517 } else {
1518 CompiledMethod* result = method->code();
1519 if (result == NULL) return false;
1520 return comp_level == result->comp_level();
1521 }
1522 }
1523 }
1524
1525
1526 /**
1527 * See if this compilation is already requested.
1528 *
1529 * Implementation note: there is only a single "is in queue" bit
1530 * for each method. This means that the check below is overly
1531 * conservative in the sense that an osr compilation in the queue
1532 * will block a normal compilation from entering the queue (and vice
1533 * versa). This can be remedied by a full queue search to disambiguate
1534 * cases. If it is deemed profitable, this may be done.
1535 */
1536 bool CompileBroker::compilation_is_in_queue(const methodHandle& method) {
1537 return method->queued_for_compilation();
1538 }
1539
1540 // ------------------------------------------------------------------
1541 // CompileBroker::compilation_is_prohibited
1542 //
1543 // See if this compilation is not allowed.
1544 bool CompileBroker::compilation_is_prohibited(const methodHandle& method, int osr_bci, int comp_level, bool excluded) {
1545 bool is_native = method->is_native();
1546 // Some compilers may not support the compilation of natives.
1547 AbstractCompiler *comp = compiler(comp_level);
1548 if (is_native && (!CICompileNatives || comp == NULL)) {
1549 method->set_not_compilable_quietly("native methods not supported", comp_level);
1550 return true;
1551 }
1552
1553 bool is_osr = (osr_bci != standard_entry_bci);
1554 // Some compilers may not support on stack replacement.
1555 if (is_osr && (!CICompileOSR || comp == NULL)) {
1556 method->set_not_osr_compilable("OSR not supported", comp_level);
1557 return true;
1558 }
1559
1560 // The method may be explicitly excluded by the user.
1561 double scale;
1562 if (excluded || (CompilerOracle::has_option_value(method, CompileCommand::CompileThresholdScaling, scale) && scale == 0)) {
1563 bool quietly = CompilerOracle::be_quiet();
1564 if (PrintCompilation && !quietly) {
1565 // This does not happen quietly...
1566 ResourceMark rm;
1567 tty->print("### Excluding %s:%s",
1568 method->is_native() ? "generation of native wrapper" : "compile",
1569 (method->is_static() ? " static" : ""));
1570 method->print_short_name(tty);
1571 tty->cr();
1572 }
1573 method->set_not_compilable("excluded by CompileCommand", comp_level, !quietly);
1574 }
1575
1576 return false;
1577 }
1578
1579 /**
1580 * Generate serialized IDs for compilation requests. If certain debugging flags are used
1581 * and the ID is not within the specified range, the method is not compiled and 0 is returned.
1582 * The function also allows to generate separate compilation IDs for OSR compilations.
1583 */
1584 int CompileBroker::assign_compile_id(const methodHandle& method, int osr_bci) {
1585 #ifdef ASSERT
1586 bool is_osr = (osr_bci != standard_entry_bci);
1587 int id;
1588 if (method->is_native()) {
1589 assert(!is_osr, "can't be osr");
1590 // Adapters, native wrappers and method handle intrinsics
1591 // should be generated always.
1592 return Atomic::add(CICountNative ? &_native_compilation_id : &_compilation_id, 1);
1593 } else if (CICountOSR && is_osr) {
1594 id = Atomic::add(&_osr_compilation_id, 1);
1595 if (CIStartOSR <= id && id < CIStopOSR) {
1596 return id;
1597 }
1598 } else {
1599 id = Atomic::add(&_compilation_id, 1);
1600 if (CIStart <= id && id < CIStop) {
1601 return id;
1602 }
1603 }
1604
1605 // Method was not in the appropriate compilation range.
1606 method->set_not_compilable_quietly("Not in requested compile id range");
1607 return 0;
1608 #else
1609 // CICountOSR is a develop flag and set to 'false' by default. In a product built,
1610 // only _compilation_id is incremented.
1611 return Atomic::add(&_compilation_id, 1);
1612 #endif
1613 }
1614
1615 // ------------------------------------------------------------------
1616 // CompileBroker::assign_compile_id_unlocked
1617 //
1618 // Public wrapper for assign_compile_id that acquires the needed locks
1619 uint CompileBroker::assign_compile_id_unlocked(Thread* thread, const methodHandle& method, int osr_bci) {
1620 MutexLocker locker(thread, MethodCompileQueue_lock);
1621 return assign_compile_id(method, osr_bci);
1622 }
1623
1624 // ------------------------------------------------------------------
1625 // CompileBroker::create_compile_task
1626 //
1627 // Create a CompileTask object representing the current request for
1628 // compilation. Add this task to the queue.
1629 CompileTask* CompileBroker::create_compile_task(CompileQueue* queue,
1630 int compile_id,
1631 const methodHandle& method,
1632 int osr_bci,
1633 int comp_level,
1634 const methodHandle& hot_method,
1635 int hot_count,
1636 CompileTask::CompileReason compile_reason,
1637 bool blocking) {
1638 CompileTask* new_task = CompileTask::allocate();
1639 new_task->initialize(compile_id, method, osr_bci, comp_level,
1640 hot_method, hot_count, compile_reason,
1641 blocking);
1642 queue->add(new_task);
1643 return new_task;
1644 }
1645
1646 #if INCLUDE_JVMCI
1647 // The number of milliseconds to wait before checking if
1648 // JVMCI compilation has made progress.
1649 static const long JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE = 1000;
1650
1651 // The number of JVMCI compilation progress checks that must fail
1652 // before unblocking a thread waiting for a blocking compilation.
1653 static const int JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS = 10;
1654
1655 /**
1656 * Waits for a JVMCI compiler to complete a given task. This thread
1657 * waits until either the task completes or it sees no JVMCI compilation
1658 * progress for N consecutive milliseconds where N is
1659 * JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE *
1660 * JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS.
1661 *
1662 * @return true if this thread needs to free/recycle the task
1663 */
1664 bool CompileBroker::wait_for_jvmci_completion(JVMCICompiler* jvmci, CompileTask* task, JavaThread* thread) {
1665 assert(UseJVMCICompiler, "sanity");
1666 MonitorLocker ml(thread, task->lock());
1667 int progress_wait_attempts = 0;
1668 jint thread_jvmci_compilation_ticks = 0;
1669 jint global_jvmci_compilation_ticks = jvmci->global_compilation_ticks();
1670 while (!task->is_complete() && !is_compilation_disabled_forever() &&
1671 ml.wait(JVMCI_COMPILATION_PROGRESS_WAIT_TIMESLICE)) {
1672 JVMCICompileState* jvmci_compile_state = task->blocking_jvmci_compile_state();
1673
1674 bool progress;
1675 if (jvmci_compile_state != NULL) {
1676 jint ticks = jvmci_compile_state->compilation_ticks();
1677 progress = (ticks - thread_jvmci_compilation_ticks) != 0;
1678 JVMCI_event_1("waiting on compilation %d [ticks=%d]", task->compile_id(), ticks);
1679 thread_jvmci_compilation_ticks = ticks;
1680 } else {
1681 // Still waiting on JVMCI compiler queue. This thread may be holding a lock
1682 // that all JVMCI compiler threads are blocked on. We use the global JVMCI
1683 // compilation ticks to determine whether JVMCI compilation
1684 // is still making progress through the JVMCI compiler queue.
1685 jint ticks = jvmci->global_compilation_ticks();
1686 progress = (ticks - global_jvmci_compilation_ticks) != 0;
1687 JVMCI_event_1("waiting on compilation %d to be queued [ticks=%d]", task->compile_id(), ticks);
1688 global_jvmci_compilation_ticks = ticks;
1689 }
1690
1691 if (!progress) {
1692 if (++progress_wait_attempts == JVMCI_COMPILATION_PROGRESS_WAIT_ATTEMPTS) {
1693 if (PrintCompilation) {
1694 task->print(tty, "wait for blocking compilation timed out");
1695 }
1696 JVMCI_event_1("waiting on compilation %d timed out", task->compile_id());
1697 break;
1698 }
1699 } else {
1700 progress_wait_attempts = 0;
1701 }
1702 }
1703 task->clear_waiter();
1704 return task->is_complete();
1705 }
1706 #endif
1707
1708 /**
1709 * Wait for the compilation task to complete.
1710 */
1711 void CompileBroker::wait_for_completion(CompileTask* task) {
1712 if (CIPrintCompileQueue) {
1713 ttyLocker ttyl;
1714 tty->print_cr("BLOCKING FOR COMPILE");
1715 }
1716
1717 assert(task->is_blocking(), "can only wait on blocking task");
1718
1719 JavaThread* thread = JavaThread::current();
1720
1721 methodHandle method(thread, task->method());
1722 bool free_task;
1723 #if INCLUDE_JVMCI
1724 AbstractCompiler* comp = compiler(task->comp_level());
1725 if (comp->is_jvmci() && !task->should_wait_for_compilation()) {
1726 // It may return before compilation is completed.
1727 free_task = wait_for_jvmci_completion((JVMCICompiler*) comp, task, thread);
1728 } else
1729 #endif
1730 {
1731 MonitorLocker ml(thread, task->lock());
1732 free_task = true;
1733 while (!task->is_complete() && !is_compilation_disabled_forever()) {
1734 ml.wait();
1735 }
1736 }
1737
1738 if (free_task) {
1739 if (is_compilation_disabled_forever()) {
1740 CompileTask::free(task);
1741 return;
1742 }
1743
1744 // It is harmless to check this status without the lock, because
1745 // completion is a stable property (until the task object is recycled).
1746 assert(task->is_complete(), "Compilation should have completed");
1747 assert(task->code_handle() == NULL, "must be reset");
1748
1749 // By convention, the waiter is responsible for recycling a
1750 // blocking CompileTask. Since there is only one waiter ever
1751 // waiting on a CompileTask, we know that no one else will
1752 // be using this CompileTask; we can free it.
1753 CompileTask::free(task);
1754 }
1755 }
1756
1757 /**
1758 * Initialize compiler thread(s) + compiler object(s). The postcondition
1759 * of this function is that the compiler runtimes are initialized and that
1760 * compiler threads can start compiling.
1761 */
1762 bool CompileBroker::init_compiler_runtime() {
1763 CompilerThread* thread = CompilerThread::current();
1764 AbstractCompiler* comp = thread->compiler();
1765 // Final sanity check - the compiler object must exist
1766 guarantee(comp != NULL, "Compiler object must exist");
1767
1768 {
1769 // Must switch to native to allocate ci_env
1770 ThreadToNativeFromVM ttn(thread);
1771 ciEnv ci_env((CompileTask*)NULL);
1772 // Cache Jvmti state
1773 ci_env.cache_jvmti_state();
1774 // Cache DTrace flags
1775 ci_env.cache_dtrace_flags();
1776
1777 // Switch back to VM state to do compiler initialization
1778 ThreadInVMfromNative tv(thread);
1779
1780 // Perform per-thread and global initializations
1781 comp->initialize();
1782 }
1783
1784 if (comp->is_failed()) {
1785 disable_compilation_forever();
1786 // If compiler initialization failed, no compiler thread that is specific to a
1787 // particular compiler runtime will ever start to compile methods.
1788 shutdown_compiler_runtime(comp, thread);
1789 return false;
1790 }
1791
1792 // C1 specific check
1793 if (comp->is_c1() && (thread->get_buffer_blob() == NULL)) {
1794 warning("Initialization of %s thread failed (no space to run compilers)", thread->name());
1795 return false;
1796 }
1797
1798 return true;
1799 }
1800
1801 /**
1802 * If C1 and/or C2 initialization failed, we shut down all compilation.
1803 * We do this to keep things simple. This can be changed if it ever turns
1804 * out to be a problem.
1805 */
1806 void CompileBroker::shutdown_compiler_runtime(AbstractCompiler* comp, CompilerThread* thread) {
1807 // Free buffer blob, if allocated
1808 if (thread->get_buffer_blob() != NULL) {
1809 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1810 CodeCache::free(thread->get_buffer_blob());
1811 }
1812
1813 if (comp->should_perform_shutdown()) {
1814 // There are two reasons for shutting down the compiler
1815 // 1) compiler runtime initialization failed
1816 // 2) The code cache is full and the following flag is set: -XX:-UseCodeCacheFlushing
1817 warning("%s initialization failed. Shutting down all compilers", comp->name());
1818
1819 // Only one thread per compiler runtime object enters here
1820 // Set state to shut down
1821 comp->set_shut_down();
1822
1823 // Delete all queued compilation tasks to make compiler threads exit faster.
1824 if (_c1_compile_queue != NULL) {
1825 _c1_compile_queue->free_all();
1826 }
1827
1828 if (_c2_compile_queue != NULL) {
1829 _c2_compile_queue->free_all();
1830 }
1831
1832 // Set flags so that we continue execution with using interpreter only.
1833 UseCompiler = false;
1834 UseInterpreter = true;
1835
1836 // We could delete compiler runtimes also. However, there are references to
1837 // the compiler runtime(s) (e.g., nmethod::is_compiled_by_c1()) which then
1838 // fail. This can be done later if necessary.
1839 }
1840 }
1841
1842 /**
1843 * Helper function to create new or reuse old CompileLog.
1844 */
1845 CompileLog* CompileBroker::get_log(CompilerThread* ct) {
1846 if (!LogCompilation) return NULL;
1847
1848 AbstractCompiler *compiler = ct->compiler();
1849 bool c1 = compiler->is_c1();
1850 jobject* compiler_objects = c1 ? _compiler1_objects : _compiler2_objects;
1851 assert(compiler_objects != NULL, "must be initialized at this point");
1852 CompileLog** logs = c1 ? _compiler1_logs : _compiler2_logs;
1853 assert(logs != NULL, "must be initialized at this point");
1854 int count = c1 ? _c1_count : _c2_count;
1855
1856 // Find Compiler number by its threadObj.
1857 oop compiler_obj = ct->threadObj();
1858 int compiler_number = 0;
1859 bool found = false;
1860 for (; compiler_number < count; compiler_number++) {
1861 if (JNIHandles::resolve_non_null(compiler_objects[compiler_number]) == compiler_obj) {
1862 found = true;
1863 break;
1864 }
1865 }
1866 assert(found, "Compiler must exist at this point");
1867
1868 // Determine pointer for this thread's log.
1869 CompileLog** log_ptr = &logs[compiler_number];
1870
1871 // Return old one if it exists.
1872 CompileLog* log = *log_ptr;
1873 if (log != NULL) {
1874 ct->init_log(log);
1875 return log;
1876 }
1877
1878 // Create a new one and remember it.
1879 init_compiler_thread_log();
1880 log = ct->log();
1881 *log_ptr = log;
1882 return log;
1883 }
1884
1885 // ------------------------------------------------------------------
1886 // CompileBroker::compiler_thread_loop
1887 //
1888 // The main loop run by a CompilerThread.
1889 void CompileBroker::compiler_thread_loop() {
1890 CompilerThread* thread = CompilerThread::current();
1891 CompileQueue* queue = thread->queue();
1892 // For the thread that initializes the ciObjectFactory
1893 // this resource mark holds all the shared objects
1894 ResourceMark rm;
1895
1896 // First thread to get here will initialize the compiler interface
1897
1898 {
1899 ASSERT_IN_VM;
1900 MutexLocker only_one (thread, CompileThread_lock);
1901 if (!ciObjectFactory::is_initialized()) {
1902 ciObjectFactory::initialize();
1903 }
1904 }
1905
1906 // Open a log.
1907 CompileLog* log = get_log(thread);
1908 if (log != NULL) {
1909 log->begin_elem("start_compile_thread name='%s' thread='" UINTX_FORMAT "' process='%d'",
1910 thread->name(),
1911 os::current_thread_id(),
1912 os::current_process_id());
1913 log->stamp();
1914 log->end_elem();
1915 }
1916
1917 // If compiler thread/runtime initialization fails, exit the compiler thread
1918 if (!init_compiler_runtime()) {
1919 return;
1920 }
1921
1922 thread->start_idle_timer();
1923
1924 // Poll for new compilation tasks as long as the JVM runs. Compilation
1925 // should only be disabled if something went wrong while initializing the
1926 // compiler runtimes. This, in turn, should not happen. The only known case
1927 // when compiler runtime initialization fails is if there is not enough free
1928 // space in the code cache to generate the necessary stubs, etc.
1929 while (!is_compilation_disabled_forever()) {
1930 // We need this HandleMark to avoid leaking VM handles.
1931 HandleMark hm(thread);
1932
1933 CompileTask* task = queue->get();
1934 if (task == NULL) {
1935 if (UseDynamicNumberOfCompilerThreads) {
1936 // Access compiler_count under lock to enforce consistency.
1937 MutexLocker only_one(CompileThread_lock);
1938 if (can_remove(thread, true)) {
1939 if (TraceCompilerThreads) {
1940 tty->print_cr("Removing compiler thread %s after " JLONG_FORMAT " ms idle time",
1941 thread->name(), thread->idle_time_millis());
1942 }
1943 // Free buffer blob, if allocated
1944 if (thread->get_buffer_blob() != NULL) {
1945 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
1946 CodeCache::free(thread->get_buffer_blob());
1947 }
1948 return; // Stop this thread.
1949 }
1950 }
1951 } else {
1952 // Assign the task to the current thread. Mark this compilation
1953 // thread as active for the profiler.
1954 // CompileTaskWrapper also keeps the Method* from being deallocated if redefinition
1955 // occurs after fetching the compile task off the queue.
1956 CompileTaskWrapper ctw(task);
1957 nmethodLocker result_handle; // (handle for the nmethod produced by this task)
1958 task->set_code_handle(&result_handle);
1959 methodHandle method(thread, task->method());
1960
1961 // Never compile a method if breakpoints are present in it
1962 if (method()->number_of_breakpoints() == 0) {
1963 // Compile the method.
1964 if ((UseCompiler || AlwaysCompileLoopMethods) && CompileBroker::should_compile_new_jobs()) {
1965 invoke_compiler_on_method(task);
1966 thread->start_idle_timer();
1967 } else {
1968 // After compilation is disabled, remove remaining methods from queue
1969 method->clear_queued_for_compilation();
1970 task->set_failure_reason("compilation is disabled");
1971 }
1972 }
1973
1974 if (UseDynamicNumberOfCompilerThreads) {
1975 possibly_add_compiler_threads(thread);
1976 assert(!thread->has_pending_exception(), "should have been handled");
1977 }
1978 }
1979 }
1980
1981 // Shut down compiler runtime
1982 shutdown_compiler_runtime(thread->compiler(), thread);
1983 }
1984
1985 // ------------------------------------------------------------------
1986 // CompileBroker::init_compiler_thread_log
1987 //
1988 // Set up state required by +LogCompilation.
1989 void CompileBroker::init_compiler_thread_log() {
1990 CompilerThread* thread = CompilerThread::current();
1991 char file_name[4*K];
1992 FILE* fp = NULL;
1993 intx thread_id = os::current_thread_id();
1994 for (int try_temp_dir = 1; try_temp_dir >= 0; try_temp_dir--) {
1995 const char* dir = (try_temp_dir ? os::get_temp_directory() : NULL);
1996 if (dir == NULL) {
1997 jio_snprintf(file_name, sizeof(file_name), "hs_c" UINTX_FORMAT "_pid%u.log",
1998 thread_id, os::current_process_id());
1999 } else {
2000 jio_snprintf(file_name, sizeof(file_name),
2001 "%s%shs_c" UINTX_FORMAT "_pid%u.log", dir,
2002 os::file_separator(), thread_id, os::current_process_id());
2003 }
2004
2005 fp = fopen(file_name, "wt");
2006 if (fp != NULL) {
2007 if (LogCompilation && Verbose) {
2008 tty->print_cr("Opening compilation log %s", file_name);
2009 }
2010 CompileLog* log = new(ResourceObj::C_HEAP, mtCompiler) CompileLog(file_name, fp, thread_id);
2011 if (log == NULL) {
2012 fclose(fp);
2013 return;
2014 }
2015 thread->init_log(log);
2016
2017 if (xtty != NULL) {
2018 ttyLocker ttyl;
2019 // Record any per thread log files
2020 xtty->elem("thread_logfile thread='" INTX_FORMAT "' filename='%s'", thread_id, file_name);
2021 }
2022 return;
2023 }
2024 }
2025 warning("Cannot open log file: %s", file_name);
2026 }
2027
2028 void CompileBroker::log_metaspace_failure() {
2029 const char* message = "some methods may not be compiled because metaspace "
2030 "is out of memory";
2031 if (_compilation_log != NULL) {
2032 _compilation_log->log_metaspace_failure(message);
2033 }
2034 if (PrintCompilation) {
2035 tty->print_cr("COMPILE PROFILING SKIPPED: %s", message);
2036 }
2037 }
2038
2039
2040 // ------------------------------------------------------------------
2041 // CompileBroker::set_should_block
2042 //
2043 // Set _should_block.
2044 // Call this from the VM, with Threads_lock held and a safepoint requested.
2045 void CompileBroker::set_should_block() {
2046 assert(Threads_lock->owner() == Thread::current(), "must have threads lock");
2047 assert(SafepointSynchronize::is_at_safepoint(), "must be at a safepoint already");
2048 #ifndef PRODUCT
2049 if (PrintCompilation && (Verbose || WizardMode))
2050 tty->print_cr("notifying compiler thread pool to block");
2051 #endif
2052 _should_block = true;
2053 }
2054
2055 // ------------------------------------------------------------------
2056 // CompileBroker::maybe_block
2057 //
2058 // Call this from the compiler at convenient points, to poll for _should_block.
2059 void CompileBroker::maybe_block() {
2060 if (_should_block) {
2061 #ifndef PRODUCT
2062 if (PrintCompilation && (Verbose || WizardMode))
2063 tty->print_cr("compiler thread " INTPTR_FORMAT " poll detects block request", p2i(Thread::current()));
2064 #endif
2065 ThreadInVMfromNative tivfn(JavaThread::current());
2066 }
2067 }
2068
2069 // wrapper for CodeCache::print_summary()
2070 static void codecache_print(bool detailed)
2071 {
2072 ResourceMark rm;
2073 stringStream s;
2074 // Dump code cache into a buffer before locking the tty,
2075 {
2076 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2077 CodeCache::print_summary(&s, detailed);
2078 }
2079 ttyLocker ttyl;
2080 tty->print("%s", s.as_string());
2081 }
2082
2083 // wrapper for CodeCache::print_summary() using outputStream
2084 static void codecache_print(outputStream* out, bool detailed) {
2085 ResourceMark rm;
2086 stringStream s;
2087
2088 // Dump code cache into a buffer
2089 {
2090 MutexLocker mu(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2091 CodeCache::print_summary(&s, detailed);
2092 }
2093
2094 char* remaining_log = s.as_string();
2095 while (*remaining_log != '\0') {
2096 char* eol = strchr(remaining_log, '\n');
2097 if (eol == NULL) {
2098 out->print_cr("%s", remaining_log);
2099 remaining_log = remaining_log + strlen(remaining_log);
2100 } else {
2101 *eol = '\0';
2102 out->print_cr("%s", remaining_log);
2103 remaining_log = eol + 1;
2104 }
2105 }
2106 }
2107
2108 void CompileBroker::post_compile(CompilerThread* thread, CompileTask* task, bool success, ciEnv* ci_env,
2109 int compilable, const char* failure_reason) {
2110 if (success) {
2111 task->mark_success();
2112 if (ci_env != NULL) {
2113 task->set_num_inlined_bytecodes(ci_env->num_inlined_bytecodes());
2114 }
2115 if (_compilation_log != NULL) {
2116 nmethod* code = task->code();
2117 if (code != NULL) {
2118 _compilation_log->log_nmethod(thread, code);
2119 }
2120 }
2121 } else if (AbortVMOnCompilationFailure) {
2122 if (compilable == ciEnv::MethodCompilable_not_at_tier) {
2123 fatal("Not compilable at tier %d: %s", task->comp_level(), failure_reason);
2124 }
2125 if (compilable == ciEnv::MethodCompilable_never) {
2126 fatal("Never compilable: %s", failure_reason);
2127 }
2128 }
2129 }
2130
2131 static void post_compilation_event(EventCompilation& event, CompileTask* task) {
2132 assert(task != NULL, "invariant");
2133 CompilerEvent::CompilationEvent::post(event,
2134 task->compile_id(),
2135 task->compiler()->type(),
2136 task->method(),
2137 task->comp_level(),
2138 task->is_success(),
2139 task->osr_bci() != CompileBroker::standard_entry_bci,
2140 (task->code() == NULL) ? 0 : task->code()->total_size(),
2141 task->num_inlined_bytecodes());
2142 }
2143
2144 int DirectivesStack::_depth = 0;
2145 CompilerDirectives* DirectivesStack::_top = NULL;
2146 CompilerDirectives* DirectivesStack::_bottom = NULL;
2147
2148 // ------------------------------------------------------------------
2149 // CompileBroker::invoke_compiler_on_method
2150 //
2151 // Compile a method.
2152 //
2153 void CompileBroker::invoke_compiler_on_method(CompileTask* task) {
2154 task->print_ul();
2155 if (PrintCompilation) {
2156 ResourceMark rm;
2157 task->print_tty();
2158 }
2159 elapsedTimer time;
2160
2161 CompilerThread* thread = CompilerThread::current();
2162 ResourceMark rm(thread);
2163
2164 if (LogEvents) {
2165 _compilation_log->log_compile(thread, task);
2166 }
2167
2168 // Common flags.
2169 uint compile_id = task->compile_id();
2170 int osr_bci = task->osr_bci();
2171 bool is_osr = (osr_bci != standard_entry_bci);
2172 bool should_log = (thread->log() != NULL);
2173 bool should_break = false;
2174 const int task_level = task->comp_level();
2175 AbstractCompiler* comp = task->compiler();
2176
2177 DirectiveSet* directive;
2178 {
2179 // create the handle inside it's own block so it can't
2180 // accidentally be referenced once the thread transitions to
2181 // native. The NoHandleMark before the transition should catch
2182 // any cases where this occurs in the future.
2183 methodHandle method(thread, task->method());
2184 assert(!method->is_native(), "no longer compile natives");
2185
2186 // Look up matching directives
2187 directive = DirectivesStack::getMatchingDirective(method, comp);
2188
2189 // Update compile information when using perfdata.
2190 if (UsePerfData) {
2191 update_compile_perf_data(thread, method, is_osr);
2192 }
2193
2194 DTRACE_METHOD_COMPILE_BEGIN_PROBE(method, compiler_name(task_level));
2195 }
2196
2197 should_break = directive->BreakAtCompileOption || task->check_break_at_flags();
2198 if (should_log && !directive->LogOption) {
2199 should_log = false;
2200 }
2201
2202 // Allocate a new set of JNI handles.
2203 push_jni_handle_block();
2204 Method* target_handle = task->method();
2205 int compilable = ciEnv::MethodCompilable;
2206 const char* failure_reason = NULL;
2207 bool failure_reason_on_C_heap = false;
2208 const char* retry_message = NULL;
2209
2210 #if INCLUDE_JVMCI
2211 if (UseJVMCICompiler && comp != NULL && comp->is_jvmci()) {
2212 JVMCICompiler* jvmci = (JVMCICompiler*) comp;
2213
2214 TraceTime t1("compilation", &time);
2215 EventCompilation event;
2216 JVMCICompileState compile_state(task, jvmci);
2217 JVMCIRuntime *runtime = NULL;
2218
2219 if (JVMCI::in_shutdown()) {
2220 failure_reason = "in JVMCI shutdown";
2221 retry_message = "not retryable";
2222 compilable = ciEnv::MethodCompilable_never;
2223 } else if (compile_state.target_method_is_old()) {
2224 // Skip redefined methods
2225 failure_reason = "redefined method";
2226 retry_message = "not retryable";
2227 compilable = ciEnv::MethodCompilable_never;
2228 } else {
2229 JVMCIEnv env(thread, &compile_state, __FILE__, __LINE__);
2230 methodHandle method(thread, target_handle);
2231 runtime = env.runtime();
2232 runtime->compile_method(&env, jvmci, method, osr_bci);
2233
2234 failure_reason = compile_state.failure_reason();
2235 failure_reason_on_C_heap = compile_state.failure_reason_on_C_heap();
2236 if (!compile_state.retryable()) {
2237 retry_message = "not retryable";
2238 compilable = ciEnv::MethodCompilable_not_at_tier;
2239 }
2240 if (task->code() == NULL) {
2241 assert(failure_reason != NULL, "must specify failure_reason");
2242 }
2243 }
2244 post_compile(thread, task, task->code() != NULL, NULL, compilable, failure_reason);
2245 if (event.should_commit()) {
2246 post_compilation_event(event, task);
2247 }
2248
2249 } else
2250 #endif // INCLUDE_JVMCI
2251 {
2252 NoHandleMark nhm;
2253 ThreadToNativeFromVM ttn(thread);
2254
2255 ciEnv ci_env(task);
2256 if (should_break) {
2257 ci_env.set_break_at_compile(true);
2258 }
2259 if (should_log) {
2260 ci_env.set_log(thread->log());
2261 }
2262 assert(thread->env() == &ci_env, "set by ci_env");
2263 // The thread-env() field is cleared in ~CompileTaskWrapper.
2264
2265 // Cache Jvmti state
2266 bool method_is_old = ci_env.cache_jvmti_state();
2267
2268 // Skip redefined methods
2269 if (method_is_old) {
2270 ci_env.record_method_not_compilable("redefined method", true);
2271 }
2272
2273 // Cache DTrace flags
2274 ci_env.cache_dtrace_flags();
2275
2276 ciMethod* target = ci_env.get_method_from_handle(target_handle);
2277
2278 TraceTime t1("compilation", &time);
2279 EventCompilation event;
2280
2281 if (comp == NULL) {
2282 ci_env.record_method_not_compilable("no compiler");
2283 } else if (!ci_env.failing()) {
2284 if (WhiteBoxAPI && WhiteBox::compilation_locked) {
2285 MonitorLocker locker(Compilation_lock, Mutex::_no_safepoint_check_flag);
2286 while (WhiteBox::compilation_locked) {
2287 locker.wait();
2288 }
2289 }
2290 comp->compile_method(&ci_env, target, osr_bci, true, directive);
2291
2292 /* Repeat compilation without installing code for profiling purposes */
2293 int repeat_compilation_count = directive->RepeatCompilationOption;
2294 while (repeat_compilation_count > 0) {
2295 task->print_ul("NO CODE INSTALLED");
2296 comp->compile_method(&ci_env, target, osr_bci, false , directive);
2297 repeat_compilation_count--;
2298 }
2299 }
2300
2301 if (!ci_env.failing() && task->code() == NULL) {
2302 //assert(false, "compiler should always document failure");
2303 // The compiler elected, without comment, not to register a result.
2304 // Do not attempt further compilations of this method.
2305 ci_env.record_method_not_compilable("compile failed");
2306 }
2307
2308 // Copy this bit to the enclosing block:
2309 compilable = ci_env.compilable();
2310
2311 if (ci_env.failing()) {
2312 failure_reason = ci_env.failure_reason();
2313 retry_message = ci_env.retry_message();
2314 ci_env.report_failure(failure_reason);
2315 }
2316
2317 post_compile(thread, task, !ci_env.failing(), &ci_env, compilable, failure_reason);
2318 if (event.should_commit()) {
2319 post_compilation_event(event, task);
2320 }
2321 }
2322 // Remove the JNI handle block after the ciEnv destructor has run in
2323 // the previous block.
2324 pop_jni_handle_block();
2325
2326 if (failure_reason != NULL) {
2327 task->set_failure_reason(failure_reason, failure_reason_on_C_heap);
2328 if (_compilation_log != NULL) {
2329 _compilation_log->log_failure(thread, task, failure_reason, retry_message);
2330 }
2331 if (PrintCompilation) {
2332 FormatBufferResource msg = retry_message != NULL ?
2333 FormatBufferResource("COMPILE SKIPPED: %s (%s)", failure_reason, retry_message) :
2334 FormatBufferResource("COMPILE SKIPPED: %s", failure_reason);
2335 task->print(tty, msg);
2336 }
2337 }
2338
2339 methodHandle method(thread, task->method());
2340
2341 DTRACE_METHOD_COMPILE_END_PROBE(method, compiler_name(task_level), task->is_success());
2342
2343 collect_statistics(thread, time, task);
2344
2345 nmethod* nm = task->code();
2346 if (nm != NULL) {
2347 nm->maybe_print_nmethod(directive);
2348 }
2349 DirectivesStack::release(directive);
2350
2351 if (PrintCompilation && PrintCompilation2) {
2352 tty->print("%7d ", (int) tty->time_stamp().milliseconds()); // print timestamp
2353 tty->print("%4d ", compile_id); // print compilation number
2354 tty->print("%s ", (is_osr ? "%" : " "));
2355 if (task->code() != NULL) {
2356 tty->print("size: %d(%d) ", task->code()->total_size(), task->code()->insts_size());
2357 }
2358 tty->print_cr("time: %d inlined: %d bytes", (int)time.milliseconds(), task->num_inlined_bytecodes());
2359 }
2360
2361 Log(compilation, codecache) log;
2362 if (log.is_debug()) {
2363 LogStream ls(log.debug());
2364 codecache_print(&ls, /* detailed= */ false);
2365 }
2366 if (PrintCodeCacheOnCompilation) {
2367 codecache_print(/* detailed= */ false);
2368 }
2369 // Disable compilation, if required.
2370 switch (compilable) {
2371 case ciEnv::MethodCompilable_never:
2372 if (is_osr)
2373 method->set_not_osr_compilable_quietly("MethodCompilable_never");
2374 else
2375 method->set_not_compilable_quietly("MethodCompilable_never");
2376 break;
2377 case ciEnv::MethodCompilable_not_at_tier:
2378 if (is_osr)
2379 method->set_not_osr_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2380 else
2381 method->set_not_compilable_quietly("MethodCompilable_not_at_tier", task_level);
2382 break;
2383 }
2384
2385 // Note that the queued_for_compilation bits are cleared without
2386 // protection of a mutex. [They were set by the requester thread,
2387 // when adding the task to the compile queue -- at which time the
2388 // compile queue lock was held. Subsequently, we acquired the compile
2389 // queue lock to get this task off the compile queue; thus (to belabour
2390 // the point somewhat) our clearing of the bits must be occurring
2391 // only after the setting of the bits. See also 14012000 above.
2392 method->clear_queued_for_compilation();
2393 }
2394
2395 /**
2396 * The CodeCache is full. Print warning and disable compilation.
2397 * Schedule code cache cleaning so compilation can continue later.
2398 * This function needs to be called only from CodeCache::allocate(),
2399 * since we currently handle a full code cache uniformly.
2400 */
2401 void CompileBroker::handle_full_code_cache(int code_blob_type) {
2402 UseInterpreter = true;
2403 if (UseCompiler || AlwaysCompileLoopMethods ) {
2404 if (xtty != NULL) {
2405 ResourceMark rm;
2406 stringStream s;
2407 // Dump code cache state into a buffer before locking the tty,
2408 // because log_state() will use locks causing lock conflicts.
2409 CodeCache::log_state(&s);
2410 // Lock to prevent tearing
2411 ttyLocker ttyl;
2412 xtty->begin_elem("code_cache_full");
2413 xtty->print("%s", s.as_string());
2414 xtty->stamp();
2415 xtty->end_elem();
2416 }
2417
2418 #ifndef PRODUCT
2419 if (ExitOnFullCodeCache) {
2420 codecache_print(/* detailed= */ true);
2421 before_exit(JavaThread::current());
2422 exit_globals(); // will delete tty
2423 vm_direct_exit(1);
2424 }
2425 #endif
2426 if (UseCodeCacheFlushing) {
2427 // Since code cache is full, immediately stop new compiles
2428 if (CompileBroker::set_should_compile_new_jobs(CompileBroker::stop_compilation)) {
2429 NMethodSweeper::log_sweep("disable_compiler");
2430 }
2431 } else {
2432 disable_compilation_forever();
2433 }
2434
2435 CodeCache::report_codemem_full(code_blob_type, should_print_compiler_warning());
2436 }
2437 }
2438
2439 // ------------------------------------------------------------------
2440 // CompileBroker::update_compile_perf_data
2441 //
2442 // Record this compilation for debugging purposes.
2443 void CompileBroker::update_compile_perf_data(CompilerThread* thread, const methodHandle& method, bool is_osr) {
2444 ResourceMark rm;
2445 char* method_name = method->name()->as_C_string();
2446 char current_method[CompilerCounters::cmname_buffer_length];
2447 size_t maxLen = CompilerCounters::cmname_buffer_length;
2448
2449 const char* class_name = method->method_holder()->name()->as_C_string();
2450
2451 size_t s1len = strlen(class_name);
2452 size_t s2len = strlen(method_name);
2453
2454 // check if we need to truncate the string
2455 if (s1len + s2len + 2 > maxLen) {
2456
2457 // the strategy is to lop off the leading characters of the
2458 // class name and the trailing characters of the method name.
2459
2460 if (s2len + 2 > maxLen) {
2461 // lop of the entire class name string, let snprintf handle
2462 // truncation of the method name.
2463 class_name += s1len; // null string
2464 }
2465 else {
2466 // lop off the extra characters from the front of the class name
2467 class_name += ((s1len + s2len + 2) - maxLen);
2468 }
2469 }
2470
2471 jio_snprintf(current_method, maxLen, "%s %s", class_name, method_name);
2472
2473 int last_compile_type = normal_compile;
2474 if (CICountOSR && is_osr) {
2475 last_compile_type = osr_compile;
2476 } else if (CICountNative && method->is_native()) {
2477 last_compile_type = native_compile;
2478 }
2479
2480 CompilerCounters* counters = thread->counters();
2481 counters->set_current_method(current_method);
2482 counters->set_compile_type((jlong) last_compile_type);
2483 }
2484
2485 // ------------------------------------------------------------------
2486 // CompileBroker::push_jni_handle_block
2487 //
2488 // Push on a new block of JNI handles.
2489 void CompileBroker::push_jni_handle_block() {
2490 JavaThread* thread = JavaThread::current();
2491
2492 // Allocate a new block for JNI handles.
2493 // Inlined code from jni_PushLocalFrame()
2494 JNIHandleBlock* java_handles = thread->active_handles();
2495 JNIHandleBlock* compile_handles = JNIHandleBlock::allocate_block(thread);
2496 assert(compile_handles != NULL && java_handles != NULL, "should not be NULL");
2497 compile_handles->set_pop_frame_link(java_handles); // make sure java handles get gc'd.
2498 thread->set_active_handles(compile_handles);
2499 }
2500
2501
2502 // ------------------------------------------------------------------
2503 // CompileBroker::pop_jni_handle_block
2504 //
2505 // Pop off the current block of JNI handles.
2506 void CompileBroker::pop_jni_handle_block() {
2507 JavaThread* thread = JavaThread::current();
2508
2509 // Release our JNI handle block
2510 JNIHandleBlock* compile_handles = thread->active_handles();
2511 JNIHandleBlock* java_handles = compile_handles->pop_frame_link();
2512 thread->set_active_handles(java_handles);
2513 compile_handles->set_pop_frame_link(NULL);
2514 JNIHandleBlock::release_block(compile_handles, thread); // may block
2515 }
2516
2517 // ------------------------------------------------------------------
2518 // CompileBroker::collect_statistics
2519 //
2520 // Collect statistics about the compilation.
2521
2522 void CompileBroker::collect_statistics(CompilerThread* thread, elapsedTimer time, CompileTask* task) {
2523 bool success = task->is_success();
2524 methodHandle method (thread, task->method());
2525 uint compile_id = task->compile_id();
2526 bool is_osr = (task->osr_bci() != standard_entry_bci);
2527 const int comp_level = task->comp_level();
2528 nmethod* code = task->code();
2529 CompilerCounters* counters = thread->counters();
2530
2531 assert(code == NULL || code->is_locked_by_vm(), "will survive the MutexLocker");
2532 MutexLocker locker(CompileStatistics_lock);
2533
2534 // _perf variables are production performance counters which are
2535 // updated regardless of the setting of the CITime and CITimeEach flags
2536 //
2537
2538 // account all time, including bailouts and failures in this counter;
2539 // C1 and C2 counters are counting both successful and unsuccessful compiles
2540 _t_total_compilation.add(time);
2541
2542 if (!success) {
2543 _total_bailout_count++;
2544 if (UsePerfData) {
2545 _perf_last_failed_method->set_value(counters->current_method());
2546 _perf_last_failed_type->set_value(counters->compile_type());
2547 _perf_total_bailout_count->inc();
2548 }
2549 _t_bailedout_compilation.add(time);
2550 } else if (code == NULL) {
2551 if (UsePerfData) {
2552 _perf_last_invalidated_method->set_value(counters->current_method());
2553 _perf_last_invalidated_type->set_value(counters->compile_type());
2554 _perf_total_invalidated_count->inc();
2555 }
2556 _total_invalidated_count++;
2557 _t_invalidated_compilation.add(time);
2558 } else {
2559 // Compilation succeeded
2560
2561 // update compilation ticks - used by the implementation of
2562 // java.lang.management.CompilationMXBean
2563 _perf_total_compilation->inc(time.ticks());
2564 _peak_compilation_time = time.milliseconds() > _peak_compilation_time ? time.milliseconds() : _peak_compilation_time;
2565
2566 if (CITime) {
2567 int bytes_compiled = method->code_size() + task->num_inlined_bytecodes();
2568 if (is_osr) {
2569 _t_osr_compilation.add(time);
2570 _sum_osr_bytes_compiled += bytes_compiled;
2571 } else {
2572 _t_standard_compilation.add(time);
2573 _sum_standard_bytes_compiled += method->code_size() + task->num_inlined_bytecodes();
2574 }
2575
2576 // Collect statistic per compilation level
2577 if (comp_level > CompLevel_none && comp_level <= CompLevel_full_optimization) {
2578 CompilerStatistics* stats = &_stats_per_level[comp_level-1];
2579 if (is_osr) {
2580 stats->_osr.update(time, bytes_compiled);
2581 } else {
2582 stats->_standard.update(time, bytes_compiled);
2583 }
2584 stats->_nmethods_size += code->total_size();
2585 stats->_nmethods_code_size += code->insts_size();
2586 } else {
2587 assert(false, "CompilerStatistics object does not exist for compilation level %d", comp_level);
2588 }
2589
2590 // Collect statistic per compiler
2591 AbstractCompiler* comp = compiler(comp_level);
2592 if (comp) {
2593 CompilerStatistics* stats = comp->stats();
2594 if (is_osr) {
2595 stats->_osr.update(time, bytes_compiled);
2596 } else {
2597 stats->_standard.update(time, bytes_compiled);
2598 }
2599 stats->_nmethods_size += code->total_size();
2600 stats->_nmethods_code_size += code->insts_size();
2601 } else { // if (!comp)
2602 assert(false, "Compiler object must exist");
2603 }
2604 }
2605
2606 if (UsePerfData) {
2607 // save the name of the last method compiled
2608 _perf_last_method->set_value(counters->current_method());
2609 _perf_last_compile_type->set_value(counters->compile_type());
2610 _perf_last_compile_size->set_value(method->code_size() +
2611 task->num_inlined_bytecodes());
2612 if (is_osr) {
2613 _perf_osr_compilation->inc(time.ticks());
2614 _perf_sum_osr_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2615 } else {
2616 _perf_standard_compilation->inc(time.ticks());
2617 _perf_sum_standard_bytes_compiled->inc(method->code_size() + task->num_inlined_bytecodes());
2618 }
2619 }
2620
2621 if (CITimeEach) {
2622 double compile_time = time.seconds();
2623 double bytes_per_sec = compile_time == 0.0 ? 0.0 : (double)(method->code_size() + task->num_inlined_bytecodes()) / compile_time;
2624 tty->print_cr("%3d seconds: %6.3f bytes/sec : %f (bytes %d + %d inlined)",
2625 compile_id, compile_time, bytes_per_sec, method->code_size(), task->num_inlined_bytecodes());
2626 }
2627
2628 // Collect counts of successful compilations
2629 _sum_nmethod_size += code->total_size();
2630 _sum_nmethod_code_size += code->insts_size();
2631 _total_compile_count++;
2632
2633 if (UsePerfData) {
2634 _perf_sum_nmethod_size->inc( code->total_size());
2635 _perf_sum_nmethod_code_size->inc(code->insts_size());
2636 _perf_total_compile_count->inc();
2637 }
2638
2639 if (is_osr) {
2640 if (UsePerfData) _perf_total_osr_compile_count->inc();
2641 _total_osr_compile_count++;
2642 } else {
2643 if (UsePerfData) _perf_total_standard_compile_count->inc();
2644 _total_standard_compile_count++;
2645 }
2646 }
2647 // set the current method for the thread to null
2648 if (UsePerfData) counters->set_current_method("");
2649 }
2650
2651 const char* CompileBroker::compiler_name(int comp_level) {
2652 AbstractCompiler *comp = CompileBroker::compiler(comp_level);
2653 if (comp == NULL) {
2654 return "no compiler";
2655 } else {
2656 return (comp->name());
2657 }
2658 }
2659
2660 jlong CompileBroker::total_compilation_ticks() {
2661 return _perf_total_compilation != NULL ? _perf_total_compilation->get_value() : 0;
2662 }
2663
2664 void CompileBroker::print_times(const char* name, CompilerStatistics* stats) {
2665 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}",
2666 name, stats->bytes_per_second(),
2667 stats->_standard._time.seconds(), stats->_standard._bytes, stats->_standard._count,
2668 stats->_osr._time.seconds(), stats->_osr._bytes, stats->_osr._count,
2669 stats->_nmethods_size, stats->_nmethods_code_size);
2670 }
2671
2672 void CompileBroker::print_times(bool per_compiler, bool aggregate) {
2673 if (per_compiler) {
2674 if (aggregate) {
2675 tty->cr();
2676 tty->print_cr("Individual compiler times (for compiled methods only)");
2677 tty->print_cr("------------------------------------------------");
2678 tty->cr();
2679 }
2680 for (unsigned int i = 0; i < sizeof(_compilers) / sizeof(AbstractCompiler*); i++) {
2681 AbstractCompiler* comp = _compilers[i];
2682 if (comp != NULL) {
2683 print_times(comp->name(), comp->stats());
2684 }
2685 }
2686 if (aggregate) {
2687 tty->cr();
2688 tty->print_cr("Individual compilation Tier times (for compiled methods only)");
2689 tty->print_cr("------------------------------------------------");
2690 tty->cr();
2691 }
2692 char tier_name[256];
2693 for (int tier = CompLevel_simple; tier <= CompilationPolicy::highest_compile_level(); tier++) {
2694 CompilerStatistics* stats = &_stats_per_level[tier-1];
2695 sprintf(tier_name, "Tier%d", tier);
2696 print_times(tier_name, stats);
2697 }
2698 }
2699
2700 if (!aggregate) {
2701 return;
2702 }
2703
2704 elapsedTimer standard_compilation = CompileBroker::_t_standard_compilation;
2705 elapsedTimer osr_compilation = CompileBroker::_t_osr_compilation;
2706 elapsedTimer total_compilation = CompileBroker::_t_total_compilation;
2707
2708 int standard_bytes_compiled = CompileBroker::_sum_standard_bytes_compiled;
2709 int osr_bytes_compiled = CompileBroker::_sum_osr_bytes_compiled;
2710
2711 int standard_compile_count = CompileBroker::_total_standard_compile_count;
2712 int osr_compile_count = CompileBroker::_total_osr_compile_count;
2713 int total_compile_count = CompileBroker::_total_compile_count;
2714 int total_bailout_count = CompileBroker::_total_bailout_count;
2715 int total_invalidated_count = CompileBroker::_total_invalidated_count;
2716
2717 int nmethods_size = CompileBroker::_sum_nmethod_code_size;
2718 int nmethods_code_size = CompileBroker::_sum_nmethod_size;
2719
2720 tty->cr();
2721 tty->print_cr("Accumulated compiler times");
2722 tty->print_cr("----------------------------------------------------------");
2723 //0000000000111111111122222222223333333333444444444455555555556666666666
2724 //0123456789012345678901234567890123456789012345678901234567890123456789
2725 tty->print_cr(" Total compilation time : %7.3f s", total_compilation.seconds());
2726 tty->print_cr(" Standard compilation : %7.3f s, Average : %2.3f s",
2727 standard_compilation.seconds(),
2728 standard_compile_count == 0 ? 0.0 : standard_compilation.seconds() / standard_compile_count);
2729 tty->print_cr(" Bailed out compilation : %7.3f s, Average : %2.3f s",
2730 CompileBroker::_t_bailedout_compilation.seconds(),
2731 total_bailout_count == 0 ? 0.0 : CompileBroker::_t_bailedout_compilation.seconds() / total_bailout_count);
2732 tty->print_cr(" On stack replacement : %7.3f s, Average : %2.3f s",
2733 osr_compilation.seconds(),
2734 osr_compile_count == 0 ? 0.0 : osr_compilation.seconds() / osr_compile_count);
2735 tty->print_cr(" Invalidated : %7.3f s, Average : %2.3f s",
2736 CompileBroker::_t_invalidated_compilation.seconds(),
2737 total_invalidated_count == 0 ? 0.0 : CompileBroker::_t_invalidated_compilation.seconds() / total_invalidated_count);
2738
2739 AbstractCompiler *comp = compiler(CompLevel_simple);
2740 if (comp != NULL) {
2741 tty->cr();
2742 comp->print_timers();
2743 }
2744 comp = compiler(CompLevel_full_optimization);
2745 if (comp != NULL) {
2746 tty->cr();
2747 comp->print_timers();
2748 }
2749 #if INCLUDE_JVMCI
2750 if (EnableJVMCI) {
2751 tty->cr();
2752 JVMCICompiler::print_hosted_timers();
2753 }
2754 #endif
2755
2756 tty->cr();
2757 tty->print_cr(" Total compiled methods : %8d methods", total_compile_count);
2758 tty->print_cr(" Standard compilation : %8d methods", standard_compile_count);
2759 tty->print_cr(" On stack replacement : %8d methods", osr_compile_count);
2760 int tcb = osr_bytes_compiled + standard_bytes_compiled;
2761 tty->print_cr(" Total compiled bytecodes : %8d bytes", tcb);
2762 tty->print_cr(" Standard compilation : %8d bytes", standard_bytes_compiled);
2763 tty->print_cr(" On stack replacement : %8d bytes", osr_bytes_compiled);
2764 double tcs = total_compilation.seconds();
2765 int bps = tcs == 0.0 ? 0 : (int)(tcb / tcs);
2766 tty->print_cr(" Average compilation speed : %8d bytes/s", bps);
2767 tty->cr();
2768 tty->print_cr(" nmethod code size : %8d bytes", nmethods_code_size);
2769 tty->print_cr(" nmethod total size : %8d bytes", nmethods_size);
2770 }
2771
2772 // Print general/accumulated JIT information.
2773 void CompileBroker::print_info(outputStream *out) {
2774 if (out == NULL) out = tty;
2775 out->cr();
2776 out->print_cr("======================");
2777 out->print_cr(" General JIT info ");
2778 out->print_cr("======================");
2779 out->cr();
2780 out->print_cr(" JIT is : %7s", should_compile_new_jobs() ? "on" : "off");
2781 out->print_cr(" Compiler threads : %7d", (int)CICompilerCount);
2782 out->cr();
2783 out->print_cr("CodeCache overview");
2784 out->print_cr("--------------------------------------------------------");
2785 out->cr();
2786 out->print_cr(" Reserved size : " SIZE_FORMAT_W(7) " KB", CodeCache::max_capacity() / K);
2787 out->print_cr(" Committed size : " SIZE_FORMAT_W(7) " KB", CodeCache::capacity() / K);
2788 out->print_cr(" Unallocated capacity : " SIZE_FORMAT_W(7) " KB", CodeCache::unallocated_capacity() / K);
2789 out->cr();
2790
2791 out->cr();
2792 out->print_cr("CodeCache cleaning overview");
2793 out->print_cr("--------------------------------------------------------");
2794 out->cr();
2795 NMethodSweeper::print(out);
2796 out->print_cr("--------------------------------------------------------");
2797 out->cr();
2798 }
2799
2800 // Note: tty_lock must not be held upon entry to this function.
2801 // Print functions called from herein do "micro-locking" on tty_lock.
2802 // That's a tradeoff which keeps together important blocks of output.
2803 // At the same time, continuous tty_lock hold time is kept in check,
2804 // preventing concurrently printing threads from stalling a long time.
2805 void CompileBroker::print_heapinfo(outputStream* out, const char* function, size_t granularity) {
2806 TimeStamp ts_total;
2807 TimeStamp ts_global;
2808 TimeStamp ts;
2809
2810 bool allFun = !strcmp(function, "all");
2811 bool aggregate = !strcmp(function, "aggregate") || !strcmp(function, "analyze") || allFun;
2812 bool usedSpace = !strcmp(function, "UsedSpace") || allFun;
2813 bool freeSpace = !strcmp(function, "FreeSpace") || allFun;
2814 bool methodCount = !strcmp(function, "MethodCount") || allFun;
2815 bool methodSpace = !strcmp(function, "MethodSpace") || allFun;
2816 bool methodAge = !strcmp(function, "MethodAge") || allFun;
2817 bool methodNames = !strcmp(function, "MethodNames") || allFun;
2818 bool discard = !strcmp(function, "discard") || allFun;
2819
2820 if (out == NULL) {
2821 out = tty;
2822 }
2823
2824 if (!(aggregate || usedSpace || freeSpace || methodCount || methodSpace || methodAge || methodNames || discard)) {
2825 out->print_cr("\n__ CodeHeapStateAnalytics: Function %s is not supported", function);
2826 out->cr();
2827 return;
2828 }
2829
2830 ts_total.update(); // record starting point
2831
2832 if (aggregate) {
2833 print_info(out);
2834 }
2835
2836 // We hold the CodeHeapStateAnalytics_lock all the time, from here until we leave this function.
2837 // That prevents other threads from destroying (making inconsistent) our view on the CodeHeap.
2838 // When we request individual parts of the analysis via the jcmd interface, it is possible
2839 // that in between another thread (another jcmd user or the vm running into CodeCache OOM)
2840 // updated the aggregated data. We will then see a modified, but again consistent, view
2841 // on the CodeHeap. That's a tolerable tradeoff we have to accept because we can't hold
2842 // a lock across user interaction.
2843
2844 // We should definitely acquire this lock before acquiring Compile_lock and CodeCache_lock.
2845 // CodeHeapStateAnalytics_lock may be held by a concurrent thread for a long time,
2846 // leading to an unnecessarily long hold time of the other locks we acquired before.
2847 ts.update(); // record starting point
2848 MutexLocker mu0(CodeHeapStateAnalytics_lock, Mutex::_safepoint_check_flag);
2849 out->print_cr("\n__ CodeHeapStateAnalytics lock wait took %10.3f seconds _________\n", ts.seconds());
2850
2851 // Holding the CodeCache_lock protects from concurrent alterations of the CodeCache.
2852 // Unfortunately, such protection is not sufficient:
2853 // When a new nmethod is created via ciEnv::register_method(), the
2854 // Compile_lock is taken first. After some initializations,
2855 // nmethod::new_nmethod() takes over, grabbing the CodeCache_lock
2856 // immediately (after finalizing the oop references). To lock out concurrent
2857 // modifiers, we have to grab both locks as well in the described sequence.
2858 //
2859 // If we serve an "allFun" call, it is beneficial to hold CodeCache_lock and Compile_lock
2860 // for the entire duration of aggregation and printing. That makes sure we see
2861 // a consistent picture and do not run into issues caused by concurrent alterations.
2862 bool should_take_Compile_lock = !SafepointSynchronize::is_at_safepoint() &&
2863 !Compile_lock->owned_by_self();
2864 bool should_take_CodeCache_lock = !SafepointSynchronize::is_at_safepoint() &&
2865 !CodeCache_lock->owned_by_self();
2866 Mutex* global_lock_1 = allFun ? (should_take_Compile_lock ? Compile_lock : NULL) : NULL;
2867 Monitor* global_lock_2 = allFun ? (should_take_CodeCache_lock ? CodeCache_lock : NULL) : NULL;
2868 Mutex* function_lock_1 = allFun ? NULL : (should_take_Compile_lock ? Compile_lock : NULL);
2869 Monitor* function_lock_2 = allFun ? NULL : (should_take_CodeCache_lock ? CodeCache_lock : NULL);
2870 ts_global.update(); // record starting point
2871 MutexLocker mu1(global_lock_1, Mutex::_safepoint_check_flag);
2872 MutexLocker mu2(global_lock_2, Mutex::_no_safepoint_check_flag);
2873 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2874 out->print_cr("\n__ Compile & CodeCache (global) lock wait took %10.3f seconds _________\n", ts_global.seconds());
2875 ts_global.update(); // record starting point
2876 }
2877
2878 if (aggregate) {
2879 ts.update(); // record starting point
2880 MutexLocker mu11(function_lock_1, Mutex::_safepoint_check_flag);
2881 MutexLocker mu22(function_lock_2, Mutex::_no_safepoint_check_flag);
2882 if ((function_lock_1 != NULL) || (function_lock_1 != NULL)) {
2883 out->print_cr("\n__ Compile & CodeCache (function) lock wait took %10.3f seconds _________\n", ts.seconds());
2884 }
2885
2886 ts.update(); // record starting point
2887 CodeCache::aggregate(out, granularity);
2888 if ((function_lock_1 != NULL) || (function_lock_1 != NULL)) {
2889 out->print_cr("\n__ Compile & CodeCache (function) lock hold took %10.3f seconds _________\n", ts.seconds());
2890 }
2891 }
2892
2893 if (usedSpace) CodeCache::print_usedSpace(out);
2894 if (freeSpace) CodeCache::print_freeSpace(out);
2895 if (methodCount) CodeCache::print_count(out);
2896 if (methodSpace) CodeCache::print_space(out);
2897 if (methodAge) CodeCache::print_age(out);
2898 if (methodNames) {
2899 if (allFun) {
2900 // print_names() can only be used safely if the locks have been continuously held
2901 // since aggregation begin. That is true only for function "all".
2902 CodeCache::print_names(out);
2903 } else {
2904 out->print_cr("\nCodeHeapStateAnalytics: Function 'MethodNames' is only available as part of function 'all'");
2905 }
2906 }
2907 if (discard) CodeCache::discard(out);
2908
2909 if ((global_lock_1 != NULL) || (global_lock_2 != NULL)) {
2910 out->print_cr("\n__ Compile & CodeCache (global) lock hold took %10.3f seconds _________\n", ts_global.seconds());
2911 }
2912 out->print_cr("\n__ CodeHeapStateAnalytics total duration %10.3f seconds _________\n", ts_total.seconds());
2913 }